10321 10322 + Culvert Report-Final

23574 Belle Vue Mill Report on Eller Beck Culvert

DW23574 Page 1 of 5 4 May 2007

07-05-04-D-Novo-23574-Culvert report-ALE.doc Date printed 17/10/2007

REPORT

On

Eller Beck Culvert At

Belle Vue Mills, Skipton


DW23574 Page 2 of 5 4 May 2007


Prepared for

Novo Homes Carleton Mill Carleton Skipton North Yorkshire BD23 3DX

Prepared by

Deakin Walton Limited Claremont House 25 Victoria Avenue Harrogate North Yorkshire HG1 5QQ Tele: 01423 561551 Fax: 01423 526863 [email protected] www.deakinwalton.co.uk

Signature Date Written by

Malcolm Lowe 8 May 07

Reviewed by

Malcolm Lowe 8 May 07

Report status

Draft


DW23574 Page 3 of 5 4 May 2007


1. Introduction

1.1 This report has been prepared for Novo Homes.

1.2 The purpose of the report is to identify the form of construction of culvert structure, condition of structure, and suitability for reuse (continued use).

1.3 Novo Homes intend to develop the Belle Vue Mills site to create retail, office, and and residential accommodation. In the existing arrangement, Eller Beck flows below the southeast corner of the site with bridging structures over the Beck to carry Brewery lane, single storey accommodation to the front of Block B and single storey accommodation of the existing Block C. The proposals include replacement of single storey accommodation in front of Block B by landscaping works; replacement of the Brewery Lane Bridge; and replacement of single storey Block C accommodation by two storey framed construction.

1.4 Sketches are included in the appendix, which show the existing arrangement of beams and arches, beam references and level survey information. A table of survey notes is also included, which gives dimensional information and condition summaries.

1.5 This report is based on a visual inspection of exposed and accessible parts of the fabric of the building. No intrusive work has been carried out.

1.6 No third party should rely on this report without written authority. It is for the sole use of The Client in connection with the specific requirements set out in the brief.

2. History

2.1 Historic maps dating back to 1757 indicate the sequence and timing of construction of the bridges and culverts in the area under consideration.

Date of map Description

1832 Open stream, small bridge under Belmont Road



1893 Bridge under Belmont Road, probably current bridge. Bridge under Brewery Lane added (old name = Brook Street)

1909 Eller beck culverted in area bounded by Block B, Brewery Lane and Belmont Road. Eller Beck culverted under Block C.

2.2 The conclusion of this map review is that the Belmont road was constructed first, prior to 1850; the bridge to carry Brewery Lane (Brook Street) was added between 1853 and 1893; the culverting of Eller beck under Block C and in front of Block B was carried out between 1893 and 1909. Strengthening to the Brewery Lane Bridge was probably added at the same time as the culverting was carried out, between 1893 and 1909.


DW23574 Page 4 of 5 4 May 2007


2.3 The forms of structures visible in the culvert were consistent with the sequence of construction postulated above.

3. Culvert between Block B and Belmont Road

3.1 The culvert roof between Block B and Belmont Road comprises steel beams and plate girders supporting concrete arches. The principal beams span from the Belmont road bridge to the front wall of Block B; bearings in the Belmont Road Bridge have been located above piers, except for minor beams, which take bearing above the stone arch of the Belmont bridge.

3.2 Surveys of the buildings and roads above ground and of the features within the culvert indicate that there is a section of pavement supported by the culvert structure. A fibre optic cable may run in this width. Any repair works to this section of pavement would need to take into account the cable and any restrictions the highway authority may wish to impose.

3.3 Beams B6 and B15 run parallel to arch spans, which conveniently allows the depth of sections to be measured for assessment purposes. Analysis of these beams in the context of existing dead loading suggests that the culvert roof capacity has a limited capacity (5.26 kN/m2), this is before reductions due to corrosion and loss of section are taken into account. This load capacity allows pedestrian access and nominal paving but not construction of planting structures and solid ramps. Construction loads should also be limited to 5.0kN unless temporary strengthening works are carried out.

3.4 Beam end that are built into the Belmont Bridge have suffered severe corrosion. The full extent of corrosion cannot be determined by a visual inspection only and so opening up works within the bridge structure will be needed to establish the residual sections of steel and feasibility of repair.

3.5 Bearing in mind the limited capacity of the existing culvert structure and its condition consideration should be given to replacement of the whole structure (support beams and concrete arches). New structure could be designed such as to limit reactions on the Belmont Road Bridge to existing reactions. Infill ramp structures could be avoided by the used of profiled slabs, similarly retailing structures for planters could be designed to be integral with the new slab. The limiting of reactions on the Belmont Bridge structure will be essential to avoid the need for justification of additional loading and associated investigation works and highway authority approvals.

4. Brewery Lane Bridge over Eller Beck

4.1 The original construction of the Brewery Lane Bridge comprised arches supported by cast iron beams spanning the full width of Eller Beck. The cast iron beams are still in place but they have been strengthened by introduction of three steel beams below, which effectively quarter the span of the original beams. The middle steel beam is supported by two cast iron columns, which extend to a pier in the middle of Eller Beck. The steel beams at quarter spans are supported by a plate girder to the east and a steel beam to the west, both of which span the full width of Eller Beck.

4.2 The arches are formed of concrete. The original bridge deck arches may have been formed in brickwork and then replaced by concrete when beam strengthening and culverting of adjacent sections of Eller Beck were carried out.


DW23574 Page 5 of 5 4 May 2007


4.3 Steel beams are at least 100 years old and conditions above the beck are damp. Bearing this in mind the condition of steel beams is surprisingly good generally, with limited loss of section, however there are locations where seepage of water through the bridge deck has resulted in wet conditions and associated severe corrosion of steel (laminated rusting). The capacity of beams will be less than the capacities predicted by dimensional analysis of beam sections. The extent of section loss can only be determined by intrusive investigation.

4.4 The bridge is to be replaced by a new road bridge capable of carrying HA and HB loading. Construction traffic will however use the bridge in the period prior to completion of the replacement bridge. Analysis of sample strengthening beams suggests that the strengthened structure has a point load capacity of 2.2 tons. This is generally in the same order as the weight restriction of 3T in place on the bridge further up Brewery Lane, over the canal. Loading on the Eller Beck/ Brewery Lane Bridge should be limited to 3T unless strengthening works are carried out or unless a more detailed assessment of material properties and section properties (reduced by corrosion, and hidden by concrete encasement) is carried out. It is unlikely that the existing bridge structure can be justified to carry full construction loading (HA loading).

4.5 If access for construction traffic is required (loading greater than 3T) then consideration should be given to construction of a supplementary structure over the top of the existing or by propping into the stream below. A more cost effective solution would be to use the entrance between Blocks A and Block B until the new bridge has been completed.

5. Culvert under Block C

5.1 The culverted section of Eller Beck under Block C has the same form of construction as that described in section 3 above (concrete arches supported by a grillage of plate girders and steel beams).

5.2 The proposals include replacement of single storey accommodation by a two storey framed building, with column loads to be taken by the culvert roof. Increased loading on the culvert roof structure could not be easily accommodated and therefore replacement of the culvert roof was included in the proposals at an early stage. This decision also resulted in an opportunity to raise the soffit level of the culvert, which was welcomed by the Environment Agency.


DW23574 Page 6 of 5 4 May 2007


6. Conclusions and Recommendations

6.1 The culvert roof over Eller Beck between Block B and Belmont Road has a limited load capacity of approximately 5.0 kN/m2.

6.2 The culvert roof over Eller Beck between Block B and Belmont Road has suffered deterioration due to corrosion of steelwork, especially at ends built into the Belmont Road Bridge. Repair works are required.

6.3 Replacement of the culvert roof (arches and beams) over Eller Beck between Block B and Belmont Road is recommended.

6.4 The Brewery Lane/ Eller Beck Bridge structure has limited capacity. Adherence to the existing 3T weight limit is recommended unless strengthening works are carried out.

End of Report


DW/23574 Appendix A 4 May 2007


Appendix A- PHOTOGRAPHS




Photograph 1

Culvert structure showing Belmont Road bridge arch to left, beam B5 to foreground, beam B6 to right and concrete arch between beam B6 and Belmont Road bridge. Note corroded steelwork to B5.

Photograph 2

Severe corrosion of small section beam ends built into Belmont Road bridge (B7, B8, B16 and B17)




Photograph 3

Beam bearing in Belmont Road bridge B2. Note severe corrosion of embedded steel.

Photograph 4

Laminated rusting of beam end.




Photograph 5

Severe corrosion of bridge strengthening steelwork to Brewery Lane bridge (beams B23 and B31)


DW/23574 Appendix B 4 May 2007


Appendix B - SURVEY NOTES




Beam Ref

Type of beam Size information Additional survey req'd

Descriptive notes Defects Remedial proposals/Further investigations

Span m

Allowable UDL incl SWT kN/m2

Allowable add load kN/m2

Ducted Eller Beck Bounded by Block B, Belmont Road and Brewery Lane

B1 Dorman Long Beam

125x(10) btm fl Y Incased steel beam section. Concrete arch onto btm flange. Exposed btm fl.

Severe corrosion to S end Depth unknown. Extent of corrosion unknown Repair/replace

2.80

B2 Dorman Long Beam

190x(23) btm fl Y Incased steel beam section. Concrete arch onto btm flange. Exposed btm flange Supports plate girder B6


3.90

B3 Dorman Long Beam


Corrosion to N end. Depth unknown. Extent of corrosion unknown Repair/replace

4.20

B4 Dorman Long Beam


Depth unknown 5.10

B5 Plate girder 2Nr 300x(16) plates btm fl

Y Incased steel beam section. Concrete arch onto btm flange. Exposed btm fl. Supports B6 and B15


6.70

B6 Plate girder 406x155 beam 2Nr 250x(14) plates T&B

Dorman long beam plus plates Supports beams B8 and B9

7.10 28.5 14.8

B7 rolled steel section

120x60 Y Built in to Belmont Road bridge Supports Beams B9-11

Severe corrosion to S end (in bridge

Extent of corrosion unknown Replace

0.80





0.80


130x70 Y Supports shallow concrete arch parallel to Belmont Road bridge

Severe corrosion 2.33







B12 Dorman Long beam


Severe corrosion N end Depth unknown. Extent of corrosion unknown

6.10



Depth unknown 6.40




B14 Plate girder 2Nr 300x(16) btm fl Y Incased steel beam section. Concrete arch onto btm flange. Exposed btm fl.Supports B15

Severe corrosion S end. Depth unknown.Extent of corrosion unknownReplace

7.30

B15 Plate girder 457x175 beam 300x(16) plates T&B

Dorman long beam plus plates Supports beams B12 and B13

Corrosion Depth unknown. Extent of corrosion unknown Repair/replace

7.10 19 5.3





0.80





0.80



Severe corrosion Replace 2.53








190x(20) Y Incased steel beam section. Concrete arch onto btm flange. Exposed btm fl.

Corrosion to bearing Extent of corrosion unknown 7.30


190x(20) Y Incased steel beam section. Concrete arch onto btm flange. Exposed btm fl.

Corrosion to bearing Extent of corrosion unknown 7.50

Brewery Lane Bridge over Eller Beck Beams

B23 Steel beam 500x190x(20) Supports beams B29-B31 on btm flange with nominal tie between webs

severe corrosion to web and flange

Replace/repair corroded section if needed for construction traffic

7.60

B24 Bespoke, Cast Iron beam

(45) deep btm flange, variable width. Widths at N support,B29-31 and S support: 250,340,360,310,290

Y Depths unknown Suppported by Beams B29-B31

Determine depths at midspan and support and extent of corrosion if needed for construction traffic

8.00


(45) deep btm flange, variable width. Widths at N support,B29-31 and S support: 250,310,370,310,255,



8.60


(45) deep btm flange, variable width. Widths at N support,B29-31 and S support: 270,335,400,400,320



9.20





(45) deep btm flange, variable width. Widths at N support,B29-31 and S support:280,310,385,385,290

Y Depths unknownSuppported by Beams B29-B31


9.90

B28 Plate girder 600x300x(16) at support 632x300x(2Nr16) at midspan Plate web with rolled angle web posts at 1400

Y Supports beams B29-B31 on btm flange with nominal tie between webs

Determine extent of corrosion if needed for construction traffic

10.00


305x155 Supported on btm fl B6 and B28 5.60


305x155 Supported on btm fl B6 and B28 Also supported by two cast iron columns in mid stream. Structural intent unclear, B30 supports B6&B28 or visa versa?

severe corrosion 5.60 22 kN Point load


305x155 Supported on btm fl B6 and B28 severe corrosion Repair /replace corroded section 5.60

Miscellaneous structural elements

Base in stream bed

Crack between posts indicating some settlement of foundation or overloading

Tie bars between cast iron beams B24-B27

severely corroded in places

Cast iron post to B30

180x(30thk) Simple prop support to B30, no visible fixing.

Stone culvert walls and bridge abutments

Coursed stone in good order

Abreviations

btm fl bottom flange Y Yes S South N North E East W West


DW/23574 Appendix C 4 May 2007


Appendix C - SKETCHES

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