CONCRETE WORKS S1 COÂNG TAÙC BEÂ TOÂNG CONTENTS NOÄI DUNG 1 SCOPE OF WORK NOÄI DUNG COÂNG TAÙC 2 MATERIALS VAÄT LIEÄU 3 EXECUTION THI COÂNG 1 SCOPE OF WORK NOÄI DUNG COÂNG TAÙC 1.1 GENERAL TOÅNG QUAÙT 1.1.1 Works Coâng taùc The work includes furnishing all labour, plant, equipment and materials in connection with the supply, mixing and placing of all concrete and the supply, fabrication and erection of all reinforcing steel, together with all other associated trade work, complete as shown, as specified, or as necessary. Coâng taùc naøy bao goàm cung caáp lao ñoäng, trang thieát bò, vaät tö lieân quan ñeán vieäc cung caáp, troän vaø ñoå beâ toâng; cung caáp, gia coâng, laép ñaët coát theùp phoái hôïp cuøng vôùi caùc Nhaø thaàu khaùc. The Contractor shall make provisions and preparations and do all necessary work to receive or adjoin other work. Nhaø thaàu phaûi döï truø, chuaån bò ñeå noái keát phaàn vieäc cuûa mình vaøo coâng taùc cuûa caùc Nhaø thaàu khaùc. The Contractor shall be responsible for installation of fixings, etc., embedded in concrete, provision of holes, openings, etc., necessary to execute work of other trades. Nhaø thaàu chòu traùch nhieäm laép ñaët caùc chi tieát coá ñònh vaøo beâ toâng; cung caáp caùc loã môû theo yeâu caàu cuûa caùc Nhaø thaàu khaùc. Inspect embedded items and check accuracy prior to placing concrete. Nhaø thaàu phaûi kieåm tra caùc chi tieát choân trong beâ toâng (ñeå ñaûm baûo vò trí chính xaùc) tröôùc khi tieán haønh ñoå beâ toâng. Concrete, formwork and reinforcing steel requirements shall be as BS 8110: 1997, except where modified by this Specification. Caùc yeâu caàu veà beâ toâng, vaùn khuoân, coát theùp phaûi tuaân thuû tieâu chuaån BS 8110: 1997, ngoaïi tröø khi ñaëc ñieåm kyõ thuaät coù qui ñònh khaùc. The Contractor shall ensure that copies of this standard are available on site for reference. Nhaø thaàu caàn coù boä tieâu chuaån naøy taïi hieän tröôøng ñeå tham khaûo. 1.1.2 Record of Work Baùo caùo coâng vieäc The Contractor shall maintain and submit a weekly record in an approved format, such as electronic photos at different locations of the site but not les than 10 locations, which shall indicate major work carried out including temporary Nhaø thaàu thöïc hieän vaø trình baùo caùo haøng tuaàn theo maãu ñònh saün, trong ñoù goàm hình chuïp caùc vò trí khaùc nhau nhöng khoâng döôùi 10 vò trí ôû coâng tröôøng. Hình theå hieän caùc vieäc chính ñang thi coâng goàm caùc haïng muïc thi coâng taïm (neáu coù), laép ñaët Project Name: Saigon Pearl Development – Phase 2 Concrete Works Page 1 of 23 Project Location: HCMC Specification Rev. 0 The English prevails May 29, 2006
Transcript
CONCRETE WORKSS1 COÂNG TAÙC BEÂ TOÂNG
CONTENTS NOÄI DUNG
1 SCOPE OF WORK NOÄI DUNG COÂNG TAÙC
2 MATERIALS VAÄT LIEÄU
3 EXECUTION THI COÂNG
1 SCOPE OF WORK NOÄI DUNG COÂNG TAÙC
1.1 GENERAL TOÅNG QUAÙT
1.1.1 Works Coâng taùc
The work includes furnishing all labour, plant, equipment and materials in connection with the supply, mixing and placing of all concrete and the supply, fabrication and erection of all reinforcing steel, together with all other associated trade work, complete as shown, as specified, or as necessary.
The Contractor shall be responsible for installation of fixings, etc., embedded in concrete, provision of holes, openings, etc., necessary to execute work of other trades.
The Contractor shall maintain and submit a weekly record in an approved format, such as electronic photos at different locations of the site but not les than 10 locations, which shall indicate major work carried out including temporary
Nhaø thaàu thöïc hieän vaø trình baùo caùo haøng tuaàn theo maãu ñònh saün, trong ñoù goàm hình chuïp caùc vò trí khaùc nhau nhöng khoâng döôùi 10 vò trí ôû coâng tröôøng. Hình theå hieän caùc vieäc chính ñang thi coâng goàm caùc haïng muïc thi coâng taïm (neáu coù), laép ñaët
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works (if any), formwork erection, steel fixing, concrete work exposed upon, formwork removal, etc.
Description of material used by location including source and type of cement, source and sizes of aggregates, source and mix proportion of concrete, source and grade of steel bars, etc. Delivery and quantity of material to Site.
All plain and reinforced concrete work specified hereafter shall be carried out in strict accordance with the Structural Engineering and Architectural Drawings.
Coâng taùc beâ toâng coù hay khoâng coù coát theùp sau phaûi tuaân thuû nghieâm ngaët caùc chi tieát ghi treân baûn veõ keát caáu, kieán truùc vaø caùc chi tieát sau naøy.
1.5 TESTS THÖÛ NGHIEÄM
1.5.1 Frequency of Tests Soá löôïng thöû nghieäm
The Contractor as a minimum shall undertake 1 set of concrete tests for pours less than 12 m3.
The tests shall be undertaken by a certified laboratory approved by the Client.
Thöû nghieäm seõ do moät ñôn vò coù ñaêng kyù hôïp leä thöïc hieän, sau khi coù söï ñoàng yù cuûa Chuû ñaàu tö.
In addition to this, all delivery trucks supplying concrete for water tanks or other liquid containing structures shall have one set of test samples taken per delivery.
The costs of all materials, labour, transport, fees etc. incurred in testing shall be borne by the Contractor.
Chi phí veà vaät lieäu, nhaân coâng, vaän chuyeån, phuï phí lieân quan ñeán coâng taùc thöû maãu beâ toâng seõ do Nhaø thaàu chòu.
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1.5.3 Standards of Tests Tieâu chuaån thöû nghieäm
Concrete compression tests shall be carried out as TCVN 356: 2005
The Contractor shall, on request, demonstrate to the Client that all reinforcement complies with the Specification and produce manufacturer's certificates and certificates of origin.
Aggregates to be tested every 1000m3 to ensure compliance with the requirements of BS 882, 1201. Test summary to be submitted to the clients appointed project manager for approval.
In the event of this Specification being at variance with any provision of this Standard, the requirements of this Specification take precedence over the provisions of the Standard.
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BS 6399 – Part 1 - Loading Code Dead and Live Loads.
The requirements of the British Standards will apply in the first instance, except where the the Vietnamese standards are stipulated in the Vietnamese building authority requirements
Caùc yeâu caàu cuûa tieâu chuaån Anh seõ ñöôïc tuaân thuû tröôùc, tröø tröôøng hôïp caùc tieâu chuaån Vieät Nam ñöôïc cô quan thaåm quyeàn veà xaây döïng cuûa Vieät Nam quy ñònh.
2 MATERIALS VAÄT LIEÄU
2.1 CEMENT XI MAÊNG
2.1.1 Portland Cement Xi maêng Portland
Portland Cement (and rapid-hardening Portland Cement if used under conditions mentioned in Clause “2.1.2 – Special Cements” shall conform in every respect with the requirements of BS 12: 1996
Xi maêng Portland (vaø xi maêng Portland ñoâng cöùng nhanh) neáu ñöôïc söû duïng theo ñieàu kieän ghi ôû tieåu khoaûn “2.1.2 - Xi maêng ñaëc bieät” phaûi tuaân thuû nghieâm ngaët caùc yeâu caàu cuûa tieâu chuaån Anh BS 12: 1996
Cement shall be stored under cover and not in contact with a damp floor or ground and shall be used in the order of delivery.
No cement which is in any way affected by dampness shall be used and if for any reason cement is not used for considerable period, it shall be inspected and tested before use.
Tuyeät ñoái khoâng söû duïng ximaêng ñaõ bò aåm, phaûi kieåm tra vaø thöû nghieäm xi maêng quaù thôøi haïn tröôùc khi duøng.
The brand of cement used shall not be changed without the Clients approval.
Thöông hieäu xi maêng chæ ñöôïc thay ñoåi khi coù yeâu caàu cuûa Chuû ñaàu tö.
2.1.2 Special Cements Xi maêng ñaëc bieät
Quick setting or other special cements shall not be used without the permission in writing of the Client and only under such conditions as the Client may require and set down in writing.
Chæ ñöôïc söû duïng ximaêng ñoâng cöùng nhanh hay loaïi xi maêng ñaëc bieät khaùc khi coù vaên baûn chaáp thuaän hay yeâu caàu cuûa Chuû ñaàu tö.
No extra costs arising from the use of special cements will be accepted unless such special
Khoâng chaáp nhaän chi phí phaùt sinh do söû duïng xi maêng loaïi ñaëc bieät, tröø phi coù quy ñònh roõ reät veà söû
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cement is specified. duïng naøy.
2.1.3 Tests Thöû nghieäm
See Clause “1.5 – Tests” relating to testing. Xem ñieàu khoaûn 1.5 thöû nghieäm
Notwithstanding the production of Certificates of vendor's tests, the Client may at his discretion, require that, after the cement has been brought on to the works, such further tests shall be made as he considers necessary to ensure that the cement complies with the specification.
If the Client requires further tests to be made, the cement shall not be used without his permission.
Neáu Chuû ñaàu tö yeâu caàu thöïc hieän thöû nghieäm boå sung thì xi maêng naøy chæ ñöôïc söû duïng khi coù yù kieán cuûa oâng ta.
2.2 AGGREGATES COÁT LIEÄU
2.2.1 Fine Aggregates Coát lieäu mòn
Fine aggregates shall consist of natural sand or of sand prepared from stone, gravel or other material with the requirements of B.S 882, 1201: Part 2: 1973.
Bao goàm caùt töï nhieân vaø caùt töø ñaù, soûi hay vaät lieäu khaùc theo Tieâu chuaån Anh B.S 882, 1201: Phaàn 2: 1973.
Shall be clean, sharp, well washed and screened if necessary, before use.
Coát lieäu phaûi saïch, saéc caïnh, ñöôïc saøng qua vaø röûa saïch tröôùc khi duøng.
The use of granite fines in lieu of sand shall be subject to the approval of the Engineer who may require adjustment to the mix proportion as necessary.
Vieäc söû duïng granite mòn thay cho caùt seõ tuøy vaøo söï pheâ chuaån cuûa Kyõ sö hoaëc Kyõ sö seõ cho pheùp tyû leä troän khi caàn thieát.
2.2.2 Coarse Aggregates Coát lieäu thoâ
Coarse aggregate shall consist of gravel, crushed stone, or crushed gravel or other inert materials of similar characteristics or combination thereof, have hard, strong durable pieces, free from adherent coatings and shall comply with requirements of B.S 882, 1201: Part 2: 1973.
Bao goàm soûi, ñaù nghieàn, soûi nghieàn hay caùc vaät lieäu trô khaùc coù ñaëc tính töông ñöông hoaëc hoãn hôïp, coù maãu cöùng vaø dai beàn, khoâng coù lôùp baùm dinh tuaân theo Tieâu chuaån Anh B.S 882, 1201: Phaàn 2: 1973.
The nominal maximum size of coarse aggregate shall be 20 mm unless otherwise approved or specified by the Client.
All water used in mixing with cement for concrete, mortar or grout, in cleaning out or wetting forms, in washing materials or in curing concrete shall be clean and fresh and where available, direct from the Local Authority mains.
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Japanese grade equivalent (JIS). töông ñöông cuûa Nhaät (JIS).
2.4.2 Hard Drawn Steel Wire Mesh Löôùi theùp keùo caêng
Hard Drawn Steel Wire Mesh (generally known as BRC or HRC Mesh) shall conform to the requirements of BS 4483: 1985
The standard of the forms shall be such that finished concrete work shall be within the following maximum tolerances:
Tieâu chuaån veà vaùn khuoân phaûi sao cho coâng taùc ñoå beâ toâng coù sai soá nhö sau:
Tolerances table Baûng sai soá
Location Tolerances Vò trí Sai soá
Storey height: +3 mm -6 mm Chieàu cao taàng: +3 mm -6 mm
Openings in walls: Loã môû töôøng:
• Out of plumb +3 mm -3 mm • Khoâng thaúng +3 mm -3 mm
Dimensions: Kích côõ:
• height +3 mm -6 mm • Roäng +3 mm -6 mm
• breadth +3 mm -6 mm • Cao +3 mm -6 mm
Member thickness: +3 mm -3 mm Beà daøy caáu kieän: +3 mm -3 mm
2.5.3 3,000 straight edge test Thöû baèng thöôùc raø daøi 3 m
Notwithstanding the above, a 3,000 mm straight edge placed in any direction on the surface of the formwork shall not disclose deviation in excess of 2 mm.
2.6 ORIGIN AND SUPPLY OF MATERIALS NGUOÀN CUNG CAÁP VAÄT LIEÄU
2.6.1 General Toång quaùt
It shall be the responsibility of the Contractor to obtain the maximum possible uniformity of colour in the concrete for external walls and thus the cement, sand and aggregate shall be from one origin and one supplier for the whole job.
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drawings.
• 40 MPa to Water and septic tanks • 40 Mpa ñoái caùc beå chöùa nöôùc vaø haàm phaân.
Except as expressly specified to the contrary elsewhere, concrete shall be special grade concrete obtained from a Plant certified by the Ready Mixed Concrete Association as capable of making Special Grade Concrete.
Concrete manufactured under conditions in every respect complying with the requirements of BS 8110: 1997 for Special Grade concrete, but obtained from another Plant approved by the Client.
If the Contractor wishes to employ such a firm, application for the Client's approval for their employment shall be made in writing to the Client at least two weeks before Tenders close, to enable the Client to inspect the proposed plant and approve it, or otherwise.
Neáu Nhaø thaàu muoán söû duïng nguoàn beâ toâng naøy, hoï caàn thoâng baùo baèng vaên baûn ñeán Chuû ñaàu tö ít nhaát hai tuaàn tröôùc khi ñoùng thaàu ñeå Chuû ñaàu tö coù ñieàu kieän tham quan nhaø maùy vaø ra quyeát ñònh cuoái.
Such application shall be accompanied by a letter signed by the Registered Client in charge of concrete making for the firm in question, certifying that their equipment complies with BS 8110: 1997 for Special Grade concrete and setting out the mixes it is proposed to use on this Contract, and consistency of results obtained therefrom.
Weak concrete screed 50 mm thick shall be placed under all foundations immediately the excavation has been approved by the Client, unless the Client approves or the Specification states that this is not to be done.
Vöõa caùn daøy 50 mm ñöôïc traûi döôùi ñaùy moùng ngay sau khi Chuû ñaàu tö chaáùp nhaän coâng taùc ñaøo ñaát. Tröø khi Chuû ñaàu tö hoaëc Ñaëc ñieåm quy ñònh khaùc ñi.
This may be site mixed concrete, and shall have a minimum crushing strength of 3 MPa at 28 days.
Vöõa caùn coù theå troän baèng t ay vaø cöôøng ñoä neùn toái thieåu sau 28 ngaøy phaûi laø 3 Mpa.
Mix proportions by loose volume shall be either 12 parts of approved graded all-in metal aggregate to 1 part or, 10 parts of clean graded all-in scoria to 1 part cement.
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2.7.6 In-Situ Batching Traïm troän taïi choã
If the Contractor wishes to set up a concrete batching plant on site and manufacture concrete in site, he shall provide full details of equipment, mix proportions, cement source, method of achieving a consistent mix, control of water content etc.
Use plywood or insignus pine boxing for all formwork, unless expressly approved otherwise by the Client or specified otherwise elsewhere.
Söû duïng vaùn khuoân baèng vaùn eùp hay goã thoâng, tröø phi coù quy ñònh khaùc neâu trong ñaëc ñieåm kyõ thuaät hay coù yeâu caàu cuûa Chuû ñaàu tö.
Hidden surfaces: - Rough sawn or better grade.
Beà maët khuaát: - Vaùn khuoân baøo thoâ.
Surfaces visible on completion of the work:
- Use wrought formwork shall comprise timber or steel framing lined with 12mm thick smooth faced plywood (or equal as approved by the Consultant). All external angles shall have chamfers formed with 15x15mm wrought hard
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wood angles formwork, unless larger chamfers are defined on the drawings.
lôùn hôn.
3.1.3 Boxing Ñoùng vaùn khuoân
All concrete work, including foundations, shall be boxed unless specified to the contrary elsewhere in the Specification or expressly approved by the Client.
All joints in formwork between individual boards, between boards and fillets and between adjoining shutters must be mortar-tight and shall remain mortar-tight under the effect of the vibration necessary to give full specified compaction.
Forms shall be designed so that the deflection of sheathing shall not exceed 1/300-th of the span between supports, and in any case shall not exceed 2 mm.
Vaùn khuoân ñöôïc thieát keá sao cho ñoä leäch cuûa vaùn khoâng vöôït quaù 1/300 nhòp giöõa caùc phaàn ñôõ hay vöôït quaù 2 mm trong moïi tröôøng hôïp.
They shall be of sufficient rigidity and strength to prevent distortion due to pressure from the concrete or other loads incidental to construction.
Construction shall be such that these surfaces can be stripped without disturbing the boxing or supports to beam or slab soffits, which may require to be left in place for a longer period.
25 x 25 mm fillets and chamfers shall be used on all corners, or 25 radius covers where shown on the drawings.
AÙp duïng gôø 25x25 mm vaø vaùt taïi caùc goùc, hay lôùp baûo veä coù baùn kính laø 25 mm taïi caùc vò trí neâu treân baûn veõ.
All external angles in exposed members shall be protected against injury after stripping.
Caùc goùc ngoaøi cuûa caáu kieän hôû phaûi ñöôïc baûo veä sau khi thaùo vaùn khuoân.
Give slight bevel to all projections to ensure easy removal without damage to the concrete.
Taïo ñoä vaùt moûng ñoái vôùi caùc phaàn nhoâ ra ñeå khi thaùo vaùn khuoân khoâng gaây toån haïi cho beà maët beâ toâng.
3.1.7 Wire Ties Theùp buoäc
Wire ties are prohibited in any member in which any face will be in contact with water, exposed to weathering, where discolouration may take place, or where finished concrete is exposed to view.
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Where permitted by the Client wire ties shall be cut at least 50 mm below the surface of the concrete and the surface shall be properly pointed up with cement mortar.
Doors or openings required in the formwork for any purpose (such as treating construction joints or cleaning) shall be equipped with fasteners suitable to the pressure to be withstood.
Such openings shall be provided at suitable positions to facilitate cleaning to formwork before concrete is poured.
Loã môû caàn ñöôïc thöïc hieän taïi caùc vò trí thuaän lôïi cho coâng taùc veä sinh vaùn khuoân tröôùc khi ñoå beâ toâng.
3.1.10 Temporary Fittings Phuï kieän taïm
Bolts and other temporary metal fittings used in formwork erection shall be constructed so as to permit their easy removal to a depth of at least 50 mm from the face without injury to the concrete, and so that upon their removal the cavities left are of the smallest possible size. The cavities shall be filled to the Client's directions.
Bu loâng vaø caùc phuï kieän kim loaïi taïm thôøi khaùc aùp duïng trong coâng taùc döïng vaùn khuoân phaûi ñöôïc thi coâng sao cho chuùng ñöôïc thaùo moät caùch deã daøng ôû ñoä saâu 50 mm tính töø beà maët maø khoâng laøm hö hoûng beâ toâng, vaø sao cho sau khi thaùo vaùn khuoân, loã coù kích côõ nhoû nhaát coù theå vaø ñöôïc traùm baèng vöõa theo höôùng daãn cuûa Chuû ñaàu tö.
3.1.11 Coating of Forms Lôùp phuû vaùn khuoân
No oil-based parting medium may be used. Khoâng ñöôïc söû duïng vaät lieäu loûng coù goác daàu.
The inside surface of all forms may be given a coat of approved material which shall not adhere to or stain the concrete or be incompatible with any final painting or treatment or alternatively shall be saturated with water immediately before placing concrete.
If, during a pour, undue settlement, bulging or other defects become apparent in the formwork, the Contractor shall cease pouring and shall take all necessary steps to remedy such defects.
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Where such defect occurs in fairface surfaces, the Client must be immediately notified to enable a decision to be made on whether to continue the pouring when the defect has been remedied, provided that where such remedial work can be completed before the last concrete placed has hardened to the extent that is ceases to become plastic under vibration and where there is no danger of the quality of surface finish being affected the Contractor may elect to continue to pour.
The Contractor's attention is particularly drawn to the following point.
Nhaø thaàu caàn löu yù ñeán phaàn boå sung sau.
The Contractor's attention is drawn to the necessity of proper curing for all concrete surfaces left exposed by the removal of formwork before the expiry of the curing period.
Nhaø thaàu caàn quan taâm ñeán coâng taùc baûo döôõng ñoái vôùi beà maët beâ toâng hôû do vieäc thaùo vaùn khuoân tröôùc khi chaám döùt thôøi gian baûo döôõng.
3.2.1 Cleaning Coâng taùc veä sinh
Immediately before any concreting is commenced, formwork shall be carefully examined to see that all dirt, shavings, sawdust and other refuse has been removed.
Tröôùc khi ñoå beâ toâng phaûi laøm veä sinh vaùn khuoân: queùt buïi, daâm baøo, maït cöa, raùc reán.
See also sub-clause “3.1.12 – Bulging”. Xem tieåu khoaûn “3.1.12 - Vaùn khuoân bò phuø”.
3.2.2 Re-used Formwork Vaùn khuoân söû duïng laïi
Sound, unwarped forms may be re-used provided they satisfy all the specified requirements.
They must be thoroughly cleaned each time before re-use, and may need to be resized, retightened or repaired all as directed by the Client.
Vaùn khuoân tröôùc khi ñem ra söû duïng laïi phaûi ñöïôc veä sinh, ñònh côõ laïi hoaëc söûa chöõa theo höôùng daãn cuûa Chuû ñaàu tö.
3.3 FABRICATION AND PLACING OF REINFORCEMENT
GIA COÂNG VAØ LAÉP ÑAËT COÁT THEÙP
3.3.1 References Tham khaûo
Refer to “S2 - Reinforcing Steel” of this Specification.
Xem “S2 - Theùp Gia Cöôøng”, ñaëc ñieåm kyõ thuaät.
3.3.2 Inspection before Concreting Kieåm tra tröôùc khi ñoå beâ toâng
No concrete shall be placed until the Client has had the opportunity to satisfy himself that all the requirements of this Section have been
Coâng taùc beâ toâng chæ thöïc hieän sau khi Chuû ñaàu tö kieåm tra thaáy caùc yeâu caàu veà phaàn naøy ñöôïc tuaân thuû ñaày ñuû.
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properly complied with.
To this end the Contractor shall give the Client two day's notice when he will pour concrete.
The method of conveying the concrete from the mixer (agitator) to the place of deposit shall be such as to ensure that the concrete will be placed in its final position within 20 minutes of cessation of its mixing (agitation).
Between approved construction joints, the concrete shall be deposited in continuous horizontal layers of such depth and at such rate that no concrete will be placed against concrete which has hardened sufficiently to cause the formation of seams or planes of weakness by reason of failure of the respective deposits to thoroughly unite.
The vertical depth of each deposit shall not exceed 600 mm provided that each deposit shall be capable of being thoroughly compacted by the method of compaction approved by the Client.
During and immediately after placing, concrete shall be thoroughly compacted and worked around reinforcement and embedded fixtures, and into the corners of the forms, by means of
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approved mechanical immersion type vibrators used in a manner such that every part of the concrete is thoroughly compacted in the shortest practicable time.
Vibration shall not be applied directly or through reinforcement to concrete which has hardened to an extent that it ceases to become plastic under vibration, unless such concrete is at least 3 days old.
The Contractor shall have at least two immersion type vibrators in full working order at each part of the site where concrete is being poured.
Nhaø thaàu phaûi coù ít nhaát hai thieát bò ñaàm duøi hoaït ñoäng toát trong quaù trình ñoå beâ toâng.
If the Contractor is of the opinion that the use of immersion type vibrators is not practicable, he shall seek the approval of the Client, before such work begins, for the method of compaction to be used.
3.4.5 Do Not Disturb Fresh Concrete Khoâng ñöôïc xaùo troän beâ toâng vöøa môùi ñoå
Care shall be taken that no shock or vibration reaches concrete after setting until it is at least 3 days old, and that any starters projecting from green concrete are not shaken or disturbed.
The Contractor shall take care to provide a well balanced concrete for this purpose, so as to avoid excess water and mortar appearing on the surface after compacting.
At least two hours shall elapse after depositing concrete in columns before concreting may start in any member supported thereon.
Sau khi ñoå beâ toâng coät hai giôø môùi ñöôïc tieán haønh thi coâng tieáp caùc caáu kieän ñôõ coät.
3.4.9 Inspection Before Concreting Kieåm tra tröôùc khi ñoå beâ toâng
No concrete shall be placed until the Client is satisfied that all provisions of the Specification with respect to foundations, formwork,
Coâng taùc beâ toâng chæ ñöôïc thöïc hieän khi Chuû ñaàu tö xeùt thaáy, qua kieåm tra, caùc qui ñònh cuûa ñaëc ñieåm kyõ thuaät lieân quan ñeán moùng, vaùn khuoân, coát theùp, moái
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reinforcing, construction joints, etc., have been complied with entirely and to his satisfaction.
noái thi coâng ñöôïc tuaân thuû ñaày ñuû.
To this end the Contractor shall give the Client at least 48 hours notice of his intention to pour concrete.
Nhaø thaàu phaûi göûi thoâng baùo tröôùc 48 giôø.
3.4.10 Concreting in Rain Ñoå beâ toâng khi gaëp möa
No concreting shall proceed during times when the rate of rainfall exceeds 1.5 mm per hour or when, in the opinion of the Client, the rainfall is likely to be injurious to the concrete either directly or through run off from directly adjoining surfaces.
Immediately before any concreting is commenced, all formwork shall be carefully examined to see that all dirt, shavings, sawdust and other deleterious matter is removed.
Vaùn khuoân caàn ñöôïc veä sinh caån thaän tröôùc khi ñoå beâ toâng: khoâng buïi, vuïn goã, raùc reán.
3.4.12 In Wet Situations Trong caùc ñieàu kieän aåm öôùt
Where reinforced concrete is to be in contact with water or saturated ground, the mix shall be adjusted in respect of water cement ratio and minimum cement content on the basis of BS 8110: 1997
Where these adjustments conflict with the conditions of BS 8110: 1997, the lower value of water cement ratio and the larger cement content shall apply.
Neáu caùc ñieàu chænh naøy coù maâu thuaãn vôùi caùc ñieàu kieän cuûa tieâu chuaån Anh BS 8110:1997, thì aùp duïng tyû leä xi maêng - nöôùc thaáp vaø löôïng xi maêng cao.
The Client shall advise on the job if extra cement is necessary.
Chuû ñaàu tö seõ cho yù kieán veà yeâu caàu löôïng xi maêng boå sung.
3.4.13 Under Water Beâ toâng döôùi nöôùc
Where it is desired to pour concrete under water, special notice in writing shall be given to the Client who may impose such conditions and control as he thinks fit.
Phaûi thoâng baùo baèng vaên baûn cho Chuû ñaàu tö khi coù yeâu caàu ñoå beâ toâng döôùi nöôùc.
The requirements generally will be as in BS 8110: 1997, but the Client reserves the right to alter the details of these requirements.
Thoâng thöôøng aùp duïng noäi dung theo tieâu chuaån Anh BS 8110:1997, nhöng Chuû ñaàu tö coù quyeàn thay ñoåi caùc quy ñònh naøy.
3.5 CONSTRUCTION JOINTS MOÁI NOÁI THI COÂNG
3.5.1 General Toång quaùt
In general, construction joints are detailed in the Drawings and shall not be varied without the Client's express approval.
Moái noái thi coâng ñöôïc ghi chuù chi tieát treân baûn veõ vaø chæ ñöôïc thay ñoåi khi coù yù kieán cuûa Chuû ñaàu tö.
Vertical joints shall be formed with approved Moái noái ñöùng phaûi ñöôïc taïo vôùi taám ngaên ñaõ ñöôïc
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bulkheads. duyeät.
Reinforcement shall run continuously through construction joints unless shown otherwise in the drawings.
At least three clear days shall elapse between adjacent pours of concrete.
Ít nhaát ba ngaøy sau môùi ñöôïc ñoå beâ toâng tieáp.
3.5.2 Positions of Joints Vò trí caùc moái noái
The following joint position is the maximum permitted if not shown on the Drawings.
Vò trí caùc moái noái sau ñaây ñöôïc cho pheùp thöïc hieän neáu chöa coù chi tieát ghi treân baûn veõ.
• Slabs • Saøn:
These shall be as shown on the drawings, however, the Precast Flooring Contractor shall submit to the Client within 4 weeks of Tender acceptance, his proposed joint layout, should it vary from that shown.
Thi coâng theo ghi chuù treân baûn veõ, tuy nhieân Nhaø thaàu thi coâng saøn ñuùc saün phaûi trình Chuû ñaàu tö duyeät (boán tuaàn sau khi ñöôïc giao thaàu) sô ñoà moái noái ñeà xuaát neáu coù khaùc bieät so vôùi chi tieát ghi treân baûn veõ.
• Columns and Walls • Coät - töôøng
May be poured in lifts exceeding 1500 mm provided that the Contractor can demonstrate to the Client prior to construction commencement his ability to do so properly and consistently.
Unless detailed otherwise on the drawings, or approved by the Client, lengths of pours shall not exceed 9 metres for beams.
Tröø khi coù quy ñònh khaùc neâu treân baûn veõ hay coù yeâu caàu khaùc cuûa Chuû ñaàu tö, chieàu daøi khoái ñoå khoâng ñöôïc vöôït quaù 9 m.
Exterior construction joints in external concrete beams, walls and parapets and where indicated or directed by the Client, shall be sealed with an approved 10 x 15 grey polysulphide sealant applied under pressure against an approved continuous polythene tube back up.
Particular care must be taken to strictly follow the manufacturer's instructions for preparation of surfaces and mixing and application of the material.
Immediately before the new concrete is poured, Tröôùc khi ñoå beâ toâng ñôït sau, caùc beà maët phaûi ñöôïc
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the surface against which it is to be poured shall be thoroughly wetted, after which excess water shall be removed.
The following is in addition to BS 8110: 1997 Quy ñònh sau ñaây boå sung cho tieâu chuaån Anh BS 8110:1997.
All concrete shall be cured for at least 14 days. Beâ toâng caàn ñöôïc baûo döôõng ít nhaát 14 ngaøy.
Since the durability, strength, and water-tightness of the structure will depend on proper curing, the Contractor must pay careful attention to this Clause, whose requirements are the acceptable minimum.
Failure to comply with this Clause may lead to concrete being condemned by the Client, in which case it shall be taken out and replaced and correctly cured at the expense of the Contractor.
Neáu coâng taùc baûo döôõng khoâng ñöôïc quan taâm ñaày ñuû, Chuû ñaàu tö coù theå ra leänh ñaäp boû, thi coâng laïi, baûo döôõng laïi theo ñuùng qui caùch. Chi phí phaùt sinh seõ do Nhaø thaàu chòu.
3.6.2 First 7 Days After Pouring 7 ngaøy ñaàu sau khi ñoå beâ toâng
All concrete and its enclosing forms, and all surfaces at joints shall be kept continuously wet by approved means and shall be thoroughly protected from frost, from direct rays of the sun, and from drying winds.
To this end, as soon as concrete has set sufficiently, covers of continuously wetted approved materials shall be placed as required, or a system of fine water sprays shall be set up and operated continuously against the work or another suitable method adopted.
Vì vaäy khi beâ toâng vöøa ñaït ñoä cöùng, duøng caùc vaät lieäu baûo veä ñaõ thaám nöôùc ñeå boïc beâ toâng hay duøng heä thoáng phun nöôùc.
The method adopted for any part of the works shall be approved by the Client in advance.
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At no time during this period shall any surface be allowed to completely dry out.
Polythene or similar, laid onto the wetted surface as soon as the latter shall have hardened sufficiently, and maintained for at least 14 days, is an acceptable method of curing slabs.
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In any storey or 6,000 mm maximum:
9 mm Trong khoaûng 6 m (taàng laàu): 9 mm
In 12,000 mm or more: 18 mm Trong khoaûng 12 m hoaëc hôn: 18 mm
• For exposed corner columns, control-joint grooves and other conspicuous lines the following applies:
In any bay or 6000 maximum 6 mm Trong khoaûng 6m toái ña (moãi gian): 6mm
In 12000 or more 12 mm Trong khoaûng 12 m hoaëc hôn: 12 mm
3.7.4 Variation from Level or from Grades Sai soá veà cao ñoä hoaëc cöôøng ñoä
Slabs shall be finished so that a 3,000 straight-edge shall show no out-of-plane exceeding 3 mm.
Saøn hoaøn thieän khoâng ñöôïc coù ñoä leäch quaù 3 mm qua kieåm tra baèng thöôùc raø daøi 3 m.
• For ceilings, beam soffits and in arrises the following applies:
• Traàn, daï daàm vaø caïnh gôø:
Tolerance Table Baûng dung sai
In 3,000 mm: 6 mm Trong khoaûng 3 m: 6 mm
In any bay or 6,000 mm maximum:
9 mm Trong khoaûng 6 m toái ña (moãi gian): 9 mm
In 12,000 mm or more: 18 mm Trong khoaûng 12 m hoaëc hôn: 18 mm
3.7.5 Variation of the Building Grid Thay ñoåi truïc toaø nhaø
• For variations of the Building Grid lines from their true position in plan and related position of columns and walls the following applies:
• Sai soá ôû caùc truïc toaø nhaø: töø vò trí trong baûn veõ vaø vò trí coät, töôøng:
Tolerance Table Baûng dung sai
In any bay or 6,000 mm maximum:
12 mm Trong moät gian hoaëc toái ña 6 m: 12 mm
In 12,000 mm or more: 24 mm Trong khoaûng 12 m hoaëc hôn: 24 mm
3.7.6 Correction of Errors Ñieàu chænh sai soùt
Offsets of column and wall centre lines above and below any floor are not permitted.
Khoaûng caùch thaúng goùc tim coät, tim treân vaø döôùi saøn khoâng ñöôïc pheùp aùp duïng.
Where it is necessary to correct on the next floor a column which has been cast out of position, such correction shall have the approval of the Client.
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by a high standard of formwork, placing of concrete, and composition of concrete.
All surfaces visible on completion of the works shall be free from surface blemishes, entrapped air bubbles, and ridges and surface displacements greater than 2 mm at joints.
Forms shall be of plywood with joints flushed up with epoxy fillers and the whole surface finished with at least 3 coats of gloss polyurethane to obtain the maximum smoothness when stripping. Refer Clause “3.1 – Formwork and Falsework”.
Should defective or honeycombed areas, projecting fins or other blemishes exist, the Contractor shall at once inform the Client and shall under no circumstances undertake any remedial measures without the prior instruction of the Client.
The cost of any work arising from this Clause shall be borne by the Contractor.
Chi phí cho coâng taùc khaéc phuïc theo yeâu caàu cuûa ñieàu khoaûn naøy do nhaø thaàu chòu.
3.8.5 Slabs Saøn
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In general slabs shall be finished so that a 3000 straight edge shows no out-of-plane exceeding 3 mm and shall have a surface finish achieved from the skilful use of a powered steel float.
Beà maët hoaøn thieän saøn, qua kieåm tra baèng thöôùc raø 3 m, phaûi ñaït ñoä phaúng coù sai soá khoâng lôùn hôn 3 mm. Caàn söû duïng baøn xoa ñieän ñeå ñaït ñoä phaúng caàn thieát.
The use of the spot method of screeding will not be permitted.
Trim openings in the work as required. Hoaøn thieän loã môû theo yeâu caàu.
Provide and build in all necessary plugs, bolts, ties, clamps, dowels and fastenings required by other trades, including bolts for timber plates, metal angles, concrete block reinforcement and approved steel and sleeves for pipes.
Cung caáp vaø laép ñaët caùc nuùt, bu loâng, giaèng, keïp, cheâm do caùc Nhaø thaàu khaùc yeâu caàu, keå caû bu loâng cho baûn goã, ke theùp, coát theùp khoái beâ toâng, theùp vaø oáng loàng.
The Contractor shall be responsible for the set out of holes, sleeves and other items to be trimmed for or built in, and shall obtain all necessary information relating thereto from the Subcontractors concerned.
When compacting around any works beneath or adjacent to the slab, care shall be taken not to cause any displacement of structure.
Khi ñaàm neùn coâng trình döôùi hay keá beân saøn, caàn thaän troïng ñeå traùnh gaây dòch chuyeån caáu kieän.
Should any waterproofing, hardfill, or underlying ground be disturbed by construction activities, the Contractor shall make good any damage at his own expense to the specified standard before concreting may begin.
Nhaø thaàu phaûi khaéc phuïc ngay caùc thieät haïi gaây ra cho maøng choáng thaám vaø ñaát ôû beân döôùi trong quaù trình thi coâng (chi phí lieân quan do Nhaø thaàu chòu) theo tieâu chuaån qui ñònh, tröôùc khi tieán haønh ñoå beâ toâng.
The Client will require inspecting all hardfill before DPC or waterproofing is placed on it.
Chuû ñaàu tö seõ kieåm tra lôùp ñaù ñaép tröôùc khi ñoàng yù cho traûi maøng choáng thaám.
3.10.2 Waterproofing Coâng taùc choáng thaám
Waterproofing shall be laid where shown over Ñaët maøng choáng thaám treân saøn tröôùc khi laép ñaët coát
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the area of the slabs, immediately before the placing of reinforcement and extreme care shall be taken to protect waterproofing from damage of any kind.
3.10.4 Formed and Sawn Joints Moái noái taïo hình, moái noái cöa xeû
These shall be made as and where shown in the Drawings.
Caùc moái noái ñöïôc thöïc hieän theo caùc chi tieát vaø vò trí neâu treân baûn veõ.
This shall be done using a 8 mm blade, by a Specialist Sub-Contractor.
Thaàu phuï chuyeân ngaønh thöïc hieän caùc moái noái vôùi löôõi bay 8 mm.
The sawing of sawn joints shall be done as soon after the pouring of the concrete as the concrete shall have hardened sufficiently to permit sawing to be done without damaging the concrete.
Thöïc hieän cöa xeû moái noái ngay sau khi beâ toâng vöøa môùi ñoå xong, do beâ toâng vöøa ñuû cöùng ñeå vieäc cöa xeû khoâng gaây toån haïi cho beâ toâng.
As late as possible boxed joints shall be similarly sawn.
The Contractor shall ensure that no foreign matter is permitted to enter a saw cut, thereby making the placing of the filling unsatisfactory and shall take positive steps to overcome this.
Nhaø thaàu phaûi coù bieän phaùp di dôøi caùc taïp chaát tröôùc khi traùm kín caùc moái noái.
3.10.5 Surface Finish Hoaøn thieän beà maët
• Basement floors • Saøn taàng haàm
The concrete floor shall be finished using a powered float. The concrete should lightly broomed.
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Use: Duøng vaät lieäu
Sika – CHAPDUR and ANISOL E CURING AGENT
Sika-Chapdur vaø vaät lieäu baûo döôõng ANISUL E
Or Hoaëc
MBT – MASTERTOP 100 and MASTERKURE 128
MBT-MASTER TOP 100, MASTER KURE 128
The application of the material shall be carried out under the direct continuous supervision of a specialist provided by the product supplier.
The hardener should be applied in two layers by broadcasting by hand.
Phuï gia seõ ñöôïc raûi baèng tay thaønh hai lôùp.
Approximately two-thirds of the total quantity should be applied in the first broadcast and balance in the second.
Raûi 2/3 phuï gia cho lôùp raûi ñaàu; 1/3 coøn laïi cho lôùp thöù hai.
First shake on application Lôùp raûi ñaàu
Mark the floor area in bays of convenient size and keep the required number of bags of the hardener ready for each bay depending on the rate of application specified.
Chia khu vöïc saøn thaønh töøng gian coù kích côõ thích hôïp; chuaån bò saün soá löôïng tuùi phuï gia cho moãi gian theo tyû leä söû duïng ñaõ quy ñònh.
Broadcast the powder evenly by hand on the floor surface after the concrete has been floated and evaporation of bleed water.
Apply first on floor areas adjacent to walls, columns, joints, doorways where the concrete is likely to loose moisture rapidly.
Tröôùc heát raûi phuï gia taïi khu vöïc saøn gaàn töôøng, coät, moái noái, loái cöûa ñi, do ñoä aåm nôi ñaây boác hôi nhanh.
After the application the hardener darkens in colour indicating absorption of moisture from concrete and when the concrete has stiffened enough to prevent float blades from digging into the surface, float the applied surface using power floats.
Phuï gia ñoåi maøu saäm khi thaám aåm beâ toâng; sau khi beâ toâng ñoâng cöùng ñuû ñeå löôõi thieát bò xoa khoâng gaây toån haïi, duøng thieát bò xoa hoaøn thieän maët beâ toâng.
Float just enough to bring excess moisture to the surface.
Follow with the second application of the hardener as the first application proceeds to the next bay.
Baét ñaàu lôùp raûi thöù hai khi tieán haønh lôùp raûi thöù nhaát cho gian keá tieáp.
Broadcast the remaining third of the hardener evenly by hand, compensating with extra material over areas under applied during the first broadcast.
Raûi ñeàu 1/3 löôïng phuï gia coøn laïi. Tröø hao löôïng phuï gia söû duïng loá ôû lôùp raûi ñaàu.
As soon as the second layer has darkened by moisture absorption, float the surface with a power trowel equipped with float blades or disc floats.
Khi lôùp thöù hai ñoåi maøu saäm do thaám aåm beâ toâng, hoaøn thieän beà maët baèng ñóa xoa.
Finish Hoaøn thieän
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To obtain a fine non slip finish, trowel the surface after it stiffens further using a power float keeping the blades as flat as possible without digging in the surface.
Careful preparation of all construction joints to ensure proper bonding between old and new concrete, the installation of water sealants in the construction joints, joints sealants and the application of an internal membrane water barrier is required.
SIKA – HYDROTITE CJ – 0725 – 3K SIKA-HYDROTITE CJ-0725-3K
Install hydrotite rubber sealing strips in all construction joints in accordance with the Sika manual.
Ñaët daûûi cao su kín nöôùc vaøo caùc moái noái thi coâng theo höôùng daãn cuûa Nhaø saûn xuaát Sika.
3.11.3 Rebated joints Moái noái moäng
SIKAFLEX 1a SIKA FLEX 1a
Install Sikaflex joint sealer in 20 x 20 rebated primed joints on the internal wall face of all construction joints in accordance with the recommendation in the Sika manual.
On the interior face of all tanks (Walls and Floors) as well as the top of the roof slab apply a flexible cementitious water proof membrane such as SPECTITE CW 100 or equal and approved.
Apply to a minimum thickness of 2mm in two coats, all in accordance with the Spectite Manual.
AÙp duïng hai lôùp vôùi ñoä daøy toái thieåu 2 mm, theo höôùng daãn cuûa Nhaø saûn xuaát Spectite.
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