10-Storey Construction Methodology

7/31/2019 10-Storey Construction Methodology

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ONEMEGABUILDERSCONSTRUCTIONCORP.

CONSTRUCTIONM E T H O D O L O G Y

FOR

DO WELL REALTY DEVT. CORPORATIONTiosejo Bldg., Mandaluyong City

PROPOSED 10-STOREYRESIDENTIAL CONDOMINIUM

Martines St. Mandaluyong City

Prepared by : Approved By :

JIMMY T. GALANG JACMI ConstructionManager

Jose A. Aliling Constn Mgt. Inc.

By: Noted by: Cel#0919 567636/Tel No. 8992668 L-116

Date: _______________

ENGR. LORENZO R. ABELEDA MS. YNA L. LAGMANOperation Manager President

108 Bldg.A, Road 1, Pag-Asa, Quezon City,LR Abeleda Tel.No.:(02)454-6930; Telefax: (02)441-0237, Email:[email protected]

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Construction Methodology for

Do Well Realty Devt Corporation10-Storey Residential Condominiu

Martinez St., Madaluyong City.



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METHOD OF CONSTRUCTION

The main objective of the contractor is to deliver aquality structure in accordance with the plans andspecifications. This is to be done by maintaining goodworkmanship and satisfactory rendering of finishes withinthe specified period of construction. To accomplish this,the following construction procedures are established tobe the general guidelines in the implementation of the

project. Every item of work shall be done in accordance

with the said procedures unless otherwise rejected orrevised by the Owner or Project construction Manager.

Construction Procedures

Field Survey and Geotechnical Investigations

Before construction can commence , a Site Survey will beperformed to stake out the existing structures, exact propety lotboundary and Grid lines of the project site, existing roads,

electrical cables, water lines with its service connections andaccess entryways from public roads, etc.

Once the surveys are complete and if there is a descripancyresult between the Original Plan and actual site Conditions, Alldesputes and re-design (If reccomendable) will be resolved bythe JACMI Construction Manager simoultaneously with themassive excavation works by other Contractor at cost by theOwner. Upon resolution of all desputes, the Excavator willcontinue and follow the desired Grid excavation according to the

elevations setforth by the Owner/Architect required on proposedFoundation plan.

Upon reaching the bottom of foundation line, a geotechnical re-investigation will be performed by Geotesting (International) Inc.to confirm thier previous geotechnical investivation reports to


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identify subsurface conditions if it is same of previous data result

which will dictate much of the design work of the buildingfoundations, underground Cistern Tanks, STP and electricalgrounding systems. Formal confirmation will be issued priorbefore the Construction.

Re- Design and Construction Specifications

Using all of the data that has been gathered for the Projectincluding geotechnical information, environmental and climatic

conditions, site topography, etc. The Contractors engineeringgroup will keep the establish a set of site-specific constructionspecifications for the various portions of the Project. The designdata specifications are based on well proven and established setsof construction standards set forth by the various standardindustry practice groups such as the American Concrete Institute(ACI), Philippine Electrical Code (PEC), Fire Code of the Philippines, and NATIONAL Building Code of the Philippines, etc. The designand construction specifications are custom tailored for site-specific conditions by technical staff and engineers. The Projectengineering team will also ensure that all aspects of thespecifications as well as the actual on-site construction complywith all of the applicable Building codes under the National andlocal codes of the Philippines and good industry practice.Equipment procurement will also be undertaken using the Projectsite specifications. The primary Contractor will use the designspecifications as a guideline to complete the detailedconstruction plans for the Project. The design basis approachensures that the Project will be designed and constructed tomeet the minimum 15 year design life.

A. SITEWORKS:

1. Clearing and Grubbing (By Others/Owner)

Clearing: This shall include to others by Owner consist of thefelling, trimming and cutting of trees into sections and the


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satisfactory disposal of the trees and other vegetation designatedfor removal. Trees, stumps, roots, bush and other vegetation inareas to be cleared shall be cut off flush to or below the originalground surface except for trees and vegetation directed to be leftstanding.

Grubbing: This shall include to others by Owner consist of theremoval and disposal of roots larger than 75mm in diameter,matted roots and stumps from the indicated grubbing areas.Excavate these materials together with lugs, organic and metallicdebris, bush and refuse. Remove these to a depth of not less than450mm below the original soil surface. Fill depression made by

grubbing with suitable materials and compact to conform to theadjacent ground surface.

Disposal: This shall include to others by Owner consist of theremoval of all trees, shrubs, stumps, bushes and roots that wereremoved shall be disposed off the property to designated sites byany suitable means.

2. Lay-out and staking

Set the boundaries of work. Lay and stake the building, driveways,parking areas, fences and all other related structures included inthe contract. Establish lines, grades, elevations and benchmarksrequired for construction. Mark all reference points for establishinglines, grades and elevations.

B. TEMPORARY FACILITIES:

1. Construct and maintain temporary facilities required for

the project as follows:

a. Field offices and bunkhousesb. Sanitary facilitiesc. Storage facilities for materialsd. Access roads


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e. Construction fencef. Project billboardg. Temporary utilities (water, electricity, communications)

C. PERMITS, INSURANCE AND BONDS:

1. Secure all necessary construction permits as follows:

a. Building and occupancy permitsb. Telephone, water and electrical connection permitsc. Environmental compliance certificate

d. Building height certificate

2. Post all required insurance and bonds as follows:a. CARIb. Downpayment Bondc. Performance Bondd. Guarantee Bonde. Other related bonds necessary.

D. EARTHWORKS:1. Structure Excavation: This shall be done to the depth indicated

or as necessary to obtain required soil bearing values. All structuralexcavation shall extend a sufficient distance from the walls orfootings to allow for proper erection and dismantling of forms,installation of utilities and inspection. In foundation beds, finalexcavation to ground by hand shovels or machines equipped withsmooth edge bucket will be required to obtain undisturbedsubgrade foundation satisfactory to the project manager. This shallbe inspected and approved prior to concreting, installation of

underground utilities and backfilling. Surface drain water shall bekept from running into the excavated pit. Proper pumpingequipment and drainage facilities shall be maintained at all timesduring the excavation period to keep such excavations dry so as toobtain a satisfactory foundation bed.


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2. Gravel Fill: Foundation beds shall be filled with considerableamount of well graded gravel to attain the required grade elevation.This shall not be less than 100mm thick and tampered tocompaction.

3. Soil Poisoning: This should be applied using a low pressurecoarse spray at the rate of1 gallon per 10 sq.ft.At the time oftreatment, the soil shall be preferably in friable condition with lowmoisture content to allow uniform distribution of chemicals. Thisshould not be applied in conditions which can cause surface run offto avoid environmental hazard.

4. Structure Backfill: After the removal of forms, all trash and otherdebris shall be removed from the excavation. Backfilling shall bedone using approved borrow materials. Backfill in contact with newconcrete shall not be placed until at least 48 hours after theremoval of forms and the concrete has been inspected and foundsatisfactory. Filling materials shall be evenly spread in horizontallayers not more than 150mm thick. Each layer shall be wateredand compacted to a density of at least 95% of maximum density atoptimum moisture.

E. CONCRETE WORKS:

1. Mixing: All structural concrete shall be mixed and delivered tosite by transit mixers. Each batch delivered at jobsite shall beaccompanied by a time slip issued at the batching plant, bearingthe time of departure. Discharge of concrete shall be completedwithin an hour after the introduction of water to the mix.

2. Conveying: Concrete shall be conveyed from the mixer to theforms as rapidly as possible by proper methods which will not

cause segregation or loss of ingredients or aggregates. It shall bedeposited as nearly as possible in its final position. At any point inthe conveying, the free vertical drop shall not exceed 1.00m.Conveying equipment shall be thoroughly cleaned before eachrun. Concrete that has segregated in the conveying process shallbe disposed off.


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3. Vibration: All concrete with the exemption of slabs 100mm orless in depth, shall be compacted with high frequency internalmechanical vibrator. Concrete slabs 100mm or less in depth shallbe consolidated by wood tampers, spading and settling with aheavy leveling straight edge. Vibration of forms andreinforcement shall not be employed except when required by thestructural engineer. Vibration shall be discontinued when theconcrete ceased to decrease in volume.

4. Curing: Concrete shall be protected adequately and shall not be

allowed to dry out from the time it is placed until the expiration ofthe minimum curing period. Curing shall be accomplished bymoist curing or by application of liquid curing compound.

5. Testing: Concrete samples shall be taken at random throughoutthe pouring period. Tests will be made at 7, 14 and 21 days fromthe time of molding. When a satisfactory relationship between the7 and 28 day strengths has been established the 7day test resultmay be used as indicator of the 28day strength.

F. REINFORCING BARS:

1. Cutting and fabrication: All reinforcing bars shall be preparedfree from rust, oil , grease and other coatings that would reduce ordestroy bonding properties. Rebars will be cut and fabricatedusing the necessary cutting outfits and bar benders the engineerpermits.

2. Erection: Reinforcement shall be placed accurately and secured.

It shall be supported by suitable spacers and hangers. On theground or where subject to corrosion, concrete or other suitablenon-corrodible materials shall be used for supporting reinforcement.Splices shall be in accordance with the detailed drawings andconstruction notes. Splices shall not be made on beams, girdersand slabs at points of maximum stress.


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3. Testing: Samples for different sizes of rebars shall be taken forevery delivery. This shall be submitted for testing to verify theirconformity to specifications. Subsequent random testing shall beconducted throughout the construction period.

G. FORMWORKS:

Application: Varied types of forms will be utilized to differentstructures whichever fit the requirement. These are metal panels,phenolic panels and Metal Decking forms. For stairs and other

structures with complicated configurations wood and metal formswill be used.

Installation:

Metal panels and phenolic panels are keyed together by panelclips and wedge pins consecutively. At foundations these aresupported by straight props to maintain their vertical andhorizontal alignment. For suspended structures these are set on I-beams supported in space by A-frames with headers which matchperfectly with the I-beams.

Metal forms are keyed together by machine bolts and aresupported in the same manner as the metal panels.

I-beams/GI Pipe are set on straight props with headers to providelateral supports for whaler pipes supporting Metal decking andphenollic plywoods which will be used for suspended slabs.

Forms are oiled before concrete pouring to keep them frombonding to the structure and hasten the stripping process. These

are thoroughly cleaned after stripping in preparation for theconsecutive uses.

H. MASONRY WORKS:


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1. Application: 6 CHB shall be used for exterior building walls andinterior walls with embedded pipes and other utilities. 4 CHB andComposite Wall by others shall be used for all other partition walls.

2. Laying: Concrete masonry units shall be laid following theprogress of concrete works. A thorough surface preparation shallbe required prior to the laying of CHB walls and partitions. Theseshould be laid in a manner to preserve the vertical continuity ofcells filled with grout. Anchor intersection by reinforcing bars asindicated on the structural notes. Adjust each unit to its finalposition while mortar is still soft. If any unit is disturbed aftermortar has stiffened relay and replace in new mortar.

3. Testing: Samples shall be taken per delivery. These will betested for compression to verify their conformity to specifications.No unit shall be allowed for installation until satisfactory test resultsare presented.

I. ROOF FRAMING:

1. Fabrication: Trusses and other roof framing structures shall befabricated at shop in accordance with details and specifications.Fabricated structures shall be delivered to the job site primepainted and ready for erection.

2. Erection: Steel structures shall be fitted in place with the aid oflifting equipment. Base plates shall be treated with grouts toprovide uniform bearing pressure on concrete. After the finalpositioning of the frames purlins shall be laid manually followingthe spacing shown on plans. These shall be bolted or welded inplace whichever is acceptable to the engineer. All joints andframes shall be checked prior to installation of roofing sheets.

K. ROOFING WORKS:1. Delivery: This item shall be delivered at site upon the completion

of roof framing works. Samples showing colors and corrugationsshall be submitted to the architect for approval before purchasingthe item.


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2. Erection: Roofing sheets shall be installed in accordance with themanufacturers instructions and manuals. Panels shall be in fulland firm contact with the supports and with each other at side andend laps. Lay all side laps away from the prevailing wind and sealall laps with sealing material. All flashings and related closuresand accessories shall be provided as indicated or as necessary toprovide a watertight installation. Fastener spacing shall be inaccordance with the manufacturers recommendation and asnecessary to withstand design loads. Exercise extreme care indrilling pilot holes for fasteners to keep drills perpendicular andcentered in valleys or crowns. Where paint surfaces are scratchedor damaged during the installation, retouching with touch up paint

will be required provided the damage is minimal. Deformed orand heavily abraded sheets shall be replaced.

3. Warranty: A performance warranty shall be submitted to theowner upon the completion of the work.

L. WATERPROOFING WORKS:1. Application: Membrane waterproofing shall be applied to all

areas requiring waterproofing.

2. Surface Preparation: All surfaces to be waterproofed shall be

cleaned and wash with water free of salt and other deleteriousmaterials.

3. Installation: All waterproofing materials shall be installed by theaccredited supplier following the product manual.

a. Coat the entire surface with concrete primer and allow drying.

b. Membranes are unrolled and laid in the position where they areto be bonded. During each stage the membrane should overlapthe next by at least 8cm at the edges and at least 15cm at theends.

4. Guarantee: A written guarantee shall be submitted uponcompletion of the work.

M. FABRICATED MATERIALS :


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The following items shall be delivered to the job site pre assembledand ready for installation during the initial stage of masonry works:

Wood JambsMetal DoorsMetal Louvers

Glass windows and wood doors together with the finish hardwareshall be installed on the later part of construction. These shall beinstalled in a neat professional manner following the manufacturersrecommendations. After installation, hardwares shall be protectedfrom paint stains and blemishes until acceptance of work.

N. FINISHES:

1. Plain Cement Floor FinishMortar: Mortar for floor topping shall be proportioned one partPortland cement to 3 parts sand. These shall be mixed thoroughlywith the proper amount of water until uniform color andconsistency is achieved.

Application: Base coat shall be applied at a minimum thickness of40mm and shall be sufficiently plastic to provide good bond.Mortar topping shall be leveled true to required slope and shall beleft until ready for floating. The surface shall then be floated withpower trowel or wood floats whichever is applicable. Topping

works shall have no visible junction marks where one days workadjoins another. Finished work shall be covered and protected inan approved manner to prevent damage.

2. Ceramic Tile Floor FinishSurface preparation: Apply scratch coat and correct slopes

towards drains.

Tile setting: Moisture sub floor and sprinkle with pure cement andlay tiles with mortar grout. Keep the joints parallel and straightover the entire area by using straight edges. Tamp the tile solidly

onto the bed and ensure solid bedding. Lay tiles from center ofroom outward and make adjustments on walls. After the tileshave set sufficiently, force a considerable amount of grout intojoints by trowel or brush.


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Cleaning: Sponge and wash tiles thoroughly after the grout hasstiffened. Buff with dry cloth to a uniform shine.

2. Granite Slab Floor Finish

Surface preparation: Concrete shall be clean. Vacuum concretesubstrate to remove dirt and other loose particles which couldimpair adhesion.

Installation: Install granite slabs directly over concrete inaccordance with the following procedures:

a. Saturate concrete with clean water before placing setting

bed.b. Apply cement paste slush coat over surface of concrete.c. Apply mortar setting bed over cement paste slush.d. Apply uniform slurry bond coat to back of stone and place

over setting bed.e. Tamp and beat stone to obtain full contact with setting bed.

Polishing: Clean stone paving after setting and grouting arecomplete. Use polishing procedures recommended by stonesupplier for finish coating. Buff flooring to an even luster with apolishing machine

4. Marble Slab Floor FinishSurface preparation : Follow surface preparation as in granite

above.Installation : Follow granite installation.Polishing : Follow polishing of granite

5. Vinyl Tile Floor Finish

Surface preparation: Concrete shall be smooth. Grind allimperfections. Remove any organic compound which could impair

adhesion.

Lay-out: Lay flooring material with a minimum number of seamconsistent with prudent use of the material. Avoid unnecessarycross seams.


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Installation: Apply flooring in the patterns indicated. Start in thecenter of the room and work toward the edges. Keep the tile linesand joints square, symmetrical, tight and even. Vary edge widthas necessary to maintain full size tiles.

Cleaning: Remove all excessive adhesives from the surface of theflooring. After five days wash all flooring with a non alkalinesolution and rinse with clean water. Buff flooring to an even lusterwith a polishing machine.

6. Plain Cement Plaster Finish

Mortar: Mortar for plastering shall be proportioned one partPortland cement to 3 parts sand and 1/5 parts lime putty. Theseshall be mixed thoroughly with the proper amount of water untiluniform color and consistency is achieved.

Application: Base coat shall be applied with sufficient pressureand the plaster shall be sufficiently plastic to provide good bond.Plaster works shall be finished level, plumb, square and true withintolerable limits. Plaster works shall have no visible junction markswhere one days work adjoins another. Finished work shall becovered and protected in an approved manner to prevent

damage.

7. Ceramic Tile Wall FinishSurface preparation: Apply rough plastering to correct wall

imperfections.

Tile setting: Moisture the surface of scratch coat, sprinkle withpure cement and lay tiles with mortar grout. Keep the jointsparallel and straight over the entire area by using straight edges.Tamp the tile solidly onto the bed and ensure of solid bedding.Lay tiles from the top of the room downward and make

adjustments on the bottom. After the tiles have set sufficiently,force a considerable amount of grout into joints by trowel orbrush.

Cleaning: Sponge and wash tiles thoroughly after the grout hasstiffened. Buff with dry cloth to a uniform shine.


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8. Granite Wall FinishSurface Preparation: Clean surfaces to which stone wall shall be

applied.

Stone setting: Dry anchoring of stones shall be in accordance withthe following procedures:a. Erect interior stone facing and align joint width. Use temporary

shims to maintain joint width.

b. Set interior stones to anchors spaced at a maximum of 450mmapart.

c. Adjust anchors, supports and accessories to set stoneaccurately in locations indicated with edges and faces alignedaccording to established relationship and indicated tolerance.

9. Gypsum Board Ceiling: Gypsum board ceiling shall beinstalled in the following manner:

a. Install hanger rods spaced @ 1.20m OC along carryingchannels and within 150mm from the edge.

b. Install carrying channels 1.20m OC and within 150mm of walls.Position them for proper ceiling height, level and secure withwire hanger.

c. Install furring channels at right angle to carrying channel.Space furrings 400mm OC and within 150mm from walls.Secure furring to Carrying channel with clops or saddle tie.

d. At openings that interrupt channels, provide additional crossreinforcement or hangers.

e. Install gypsum panels with long dimension perpendicular tofurring channels. Position end joints over channel and staggerin adjacent rows.

f. Fit ends and edges. Fasten panels to channels with type Sscrews spaced @ 0.30m OC staggered along abutting edges.


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g. All joints and screw marks shall be reinforced with joint tapeand embedding joint compound and concealed with finishingtype joint compound. All coats shall be sanded when dried andshall be left uniformly smooth.

10. Acoustic Board on Metal T-Runners:

Acoustic Ceiling boards shall be installed in the followingmanner:

a. Install hanger rods spaced @ 1.20m OC along main T-Runners.

b. Install T-Runners 0.60m OC and within 150mm of walls.

Position them for proper ceiling height, level and secure withwire hanger. Use proper leveling tools to ensure right elevationthroughout.

c. Fit ends and edges. Fasten panels to metal T-Runners and adjustspacing where required.

d. Clean exposed surfaces of acoustic tiles and suspension members.

11. Painting: Painting works shall be done in the following

procedures:

Wood Surfaces

Sand surface until wood is smooth. Dust off completely thenwipe with a clean rug.

Apply one coat of interior primer and sealer. Patch imperfections with glazing putty or plastic wood filler.

Allow to dry and sand smooth before applying paint.

Masonry Surfaces

Treat surfaces with concrete neutralizer. Apply concrete primer. Patch all imperfection with patching compound. Apply finish coats.


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Metal Surfaces

Sand, wire brush or scrape all rusty metals. Treat surface with rust converter. Apply one coat of red lead primer. Apply finish coats.

O. SPECIALTY ITEM:

The following items shall be directly subcontracted to prequalifiedcontractors:

Toilet Partitions

Stair Railings

Miscellaneous Metal Works

Material samples, fabrication manual and installation details shall besubmitted for approval before actual awarding. Upon approval ofdetails and samples award shall be given the successful contractor.Work shall commence simultaneous with the approved and agreedschedule.

P. ELECTRO-MECHANICAL WORKS:

The following items of work shall be directly sub contracted toaccredited trade contractors :

Electrical Works Mechanical Works Sanitary Works Fire Protection System

The schedule of the different stages of the above items shall be wellcoordinated to keep pace with the smooth flow of operations. Daily

site coordination meeting will be conducted to monitor the phase ofconstruction and to keep this trade informed of the jobrequirements.

Q. SITE DEVELOPMENT


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1. Clearing and Grubbing: After the limits of work have beenestablished, surface objects, trees and other protrudingobstructions not designated to remain will be cleared by bulldozersand disposed of at designated disposal site using pay loader anddump trucks.

2. Earthworks: Excavation works using bulldozing equipment willthen commence after the lines and grades have been established.When there is a discrepancy on the actual elevations and thatshown on plans, a pre construction survey will be undertaken toserve as basis for the computation of the actual volume ofexcavated materials. Roadway excavation will be finished to

reasonably smooth and uniform surface. Suitable materials will beused as embankment and subgrade fill. Thereafter, all unsuitablematerials will be disposed of properly. Leveling of blocks usingbulldozers and road graders will be in accordance with theelevations shown on plans.

3. Sub grade Preparation: After the necessary earthworks havebeen completed and all culverts cross drains and waterlinecrossings have been installed, preparation of subgrade for supportof overlying structural layers will immediately commence. Thispreparation will extend to the full width of the roadway which will

include sidewalk, curb and gutter. All soft and unsuitable materialsthat will not compact properly will be immediately removed andreplace with suitable fill. Scarifying and blading using road gradersand rolling with vibratory rollers will then be conductedto thoroughly compact and shape the cross section of the roadbed.To check the accuracy of the work, templates and straight edgeswill be provide. Field density tests will be conducted during thisstage to determine the stability of the bed.

4. Aggregate Basecoarse: The aggregate base course will beuniformly mixed and spread on the prepared subgrade in

accordance with the plan thickness. The moisture content of basematerial will be adjusted prior to compaction by watering, in orderto obtain the required degree of compaction. Vibratory and staticrollers will be used. Along curbs, headers and walls which will notbe accessible to steel rollers, base material will be compacted withtampers and portable compactors. Compaction of each layer will


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continue until a field density of at least 98 percent of the maximumdry density is achieved.

5. Pipe Culverts and Storm Drains: Where feasible, excavation oftrenches for drainage line and manholes will commencesimultaneously with earthwork activities. Trenches will beexcavated to a width that will allow proper jointing of the conduitand compaction of bedding and backfill material. Mortar joints willbe made with an excess of mortar to form a continuous beadaround the outside of pipe conduit. Thereafter, backfill material fortrenches will be compacted in accordance with the required density.

6. Sidewalk, Curbs and Gutters: Concrete will not be placed untilforms and rebar have been checked. Forms for at least 50m will bechecked for alignment and grade. Curbs and gutters constructedon curves will have wood forms and will be finished to a smooth andeven surface and the edges rounded. Forms will be removed within24 hours after concreting. Minor defects will be retouched withmortar. The back of the curb shall be filled with suitable materialswhen the concrete has set.

7. Concrete Pavement: Concrete pavement shall be laid directlyover compacted gravel base after pouring of curbs and gutters.

Where distance between curbs exceeds 4.00m, another set of formsbetween curbs shall be required. Transit mixers shall be allowed todirectly pour concrete into the area.

********** END OF CONSTRUCTION METHODOLOGY *********

Prepared by: Checked by: Noted by :

Engr. Lorenzo R. Abeleda Engr. Melchor V. UmpadMs. Czarina L. LagmanOperation Manager Head Operations President


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