a30 temple to higher carblake - cornwall€¦ · r a30 temple to higher carblake structures notes...

A30 Temple to Higher Carblake

Structures Notes and General Arrangement

Drawings

TRXCP311/ST/01

CORMAC Consultancy CORMAC Western Region,

Radnor Road, Scorrier, Redruth, Cornwall, TR16 5EH.

2

Issue & Revision Record

Revision Date Originator Purpose of Issue / Nature of Change

- 26/12/2012 G Boyd Original

This document has been prepared for the titled project or named part thereof and should not be relied upon or used for any other project without an independent check being carried out as to its suitability and prior

written authority of Cormac Solutions Ltd being obtained. Cormac Solutions Ltd accepts no responsibility or liability for the consequences of this document being used for a purpose other than the purposes for which it was commissioned. Any person using or relying on the document for such other purposes agrees, and will by

such use or reliance be taken to confirm his agreement to indemnify Cormac Solutions Ltd for all loss or damage resulting therefrom. Cormac Solutions Ltd accepts no responsibility or liability for this document to

any party other than the person by whom it was commissioned.

Prepared by

Engineering Design Group

CORMAC Solutions Ltd Head Office, Castle Canyke Road, Bodmin, Cornwall, PL31 1DZ

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CONTENTS PAGE

1 Glossary of Terms 4

2 Introduction 5

3 Cardinham Downs Junction 6

Drawing TRXCP311/AIP/S201 7

4 Preeze Cross Junction 8


5 Temple Tor Junction 10


6 Preeze Cross Retaining Wall 12


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1 GLOSSARY OF TERMS

Feature Description

Abutment The abutments are located on either side of the bridge and support the deck as well as retaining the

adjacent soil and embankment.

Bridge A raised structure built to carry vehicles or

pedestrians over the main carriageway.

Cantilever A structural feature which projects beyond a

supporting column or wall and is counterbalanced and/or supported at only one end.

Cantilevered wall

A reinforced concrete retaining wall, stabilised by a large toe in front of the structure.

Deck The top surface of a bridge which carries the traffic.

Embankment Angled grading of the ground.

Formwork Temporary or permanent moulds into which concrete or similar materials are poured.

Footing The enlarged lower portion of the substructure or foundation which rests directly on the soil, bedrock, or piles; usually below ground and not visible.

Parapet / Guardrail

A barrier or guardrail on the outside edge of the bridge deck to prevent people and vehicles from falls

onto the carriageway below.

Pier

A central support for the bridge deck between the

abutments. This is usually located in the middle of the central reserve between the two opposing

carriageways.

Reinforced

concrete

Concrete which gains added strength by placing wire

mesh or rods into the formwork before the concrete is poured.

Reinforcement Adding strength or bearing capacity to a structural member. An example includes the placing of metal rebar into formwork before pouring concrete.

Retaining wall A wall to retain material such as earth.

Span The horizontal space between two supports of a structure.

Steel and

reinforced concrete

composite deck

The top section of a bridge directly below road level,

constructed using steel beams supporting reinforced concrete slabs.

Substructure The part of the structure below deck level including

abutments, piers, wing walls and foundations.

Superstructure The deck of the structure supported by abutments

and piers.

Wing wall A wall at the abutment of a bridge which extends

beyond the bridge to retain earth behind the abutment.

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2 INTRODUCTION

The following notes and drawings show Cornwall Council's current proposals for the structures (over bridges and retaining walls) on the A30

Temple to Higher Carblake scheme. These may be subject to change because of developments in the detailed

design or amendments due to public consultation as part of the statutory processes.

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3 CARDINHAM DOWNS JUNCTION

3.1 Description

The new structure will carry the C0109 road over the A30.

The construction consists of a two span steel and reinforced concrete composite deck supported on reinforced concrete

abutments and pier, with reinforced concrete wingwalls.

The wingwalls will be faced with granite. 3.2 Purpose

The new bridge will allow the existing side roads which serve

Waterloo and Blisland to the north and Cardinham to the south to pass safely over the A30 dual carriageway.

3.3 Location

The new bridge is to be located at the western end of the scheme near to Helligan Woods.

The grid reference is (SX) 210753 070755

3.4 Abutments / Wing walls / Retaining Walls

The substructure consists of a reinforced concrete column pier, reinforced concrete abutments and wing walls, founded on spread footings.

The wing walls will be faced with granite to allow the structure to tie

in with the surrounding area. 3.5 Superstructure

The superstructure is a square continuous two span steel and

reinforced concrete composite deck with equal spans of 24.75m semi-integral with the abutments and integral with the pier.

3.6 Parapet / Guardrail

Pre-cast cantilevered reinforced concrete edge beams support metal parapets.

3.7 Features

The new roads over the bridges will consist of a 6.8m wide single carriageway with a 1.5m wide paved verge either side.

3.8 Drawing Reference

The General Arrangement for the scheme can be found in drawing reference TRXCP311/AIP/S201.

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4 PREEZE CROSS JUNCTION

4.1 Description

The new structure will carry the C0034 over the A30.

The construction consists of a single span steel and reinforced concrete composite deck supported on reinforced concrete

abutments with reinforced concrete wingwalls.


The new bridge will allow the existing side roads which serve

Blisland to the north and Cardinham and Millpool to the south to pass safely over the A30 dual carriageway.

4.3 Location

The new bridge is to be located between the centre and western end of the scheme near at the existing Preeze Cross junction.



The substructure consists of reinforced concrete abutments and wing walls, founded on spread footings.

The wing walls will be faced with granite to allow the structure to tie in with the surrounding area.

4.5 Superstructure

The superstructure is a square single span steel and reinforced concrete composite deck with a 29.6m span semi-integral with the

abutments. 4.6 Parapet / Guardrail

Pre-cast cantilevered reinforced concrete edge beams support metal

parapets.

4.7 Features

The new road over the bridge will consist of a 6.8m wide single

carriageway with a 1.5m wide paved verge either side. 4.8 Drawing Reference

The General Arrangement for the scheme can be found in drawing

reference TRXCP311/AIP/S301.

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5 TEMPLE TOR JUNCTION

5.1 Description

The new structure will carry the C0300 road over the A30.

The construction consists of a two span steel and reinforced concrete composite deck supported on reinforced concrete

abutments and pier, with reinforced concrete wingwalls.


The new bridge will allow the existing side roads which serve St

Breward to the north and Temple to the south to pass safely over the A30 dual carriageway.

5.3 Location

The new bridge is to be located to the eastern end of the scheme near to Manor Common.

The grid reference is (SX) 213630 073641.


The substructure consists of a reinforced concrete column pier, reinforced concrete abutments and wing walls, founded on spread footings.

The wing walls will be faced with granite to allow the structure to tie

in with the surrounding area.

5.5 Superstructure

The superstructure is a square continuous two span steel and

reinforced concrete composite deck with equal spans of 24.75m semi-integral with the abutments and integral with the pier.


Pre-cast cantilevered reinforced concrete edge beams support metal parapets.

5.7 Features

The new roads over the bridges will consist of a 6.8m wide single carriageway with a 1.5m wide paved verge either side.


The General Arrangement for the scheme can be found in drawing reference TRXCP311/AIP/S401.

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6 PREEZE CROSS RETAINING WALL

6.1 Description

The structure will entail a new masonry faced reinforced concrete

retaining wall to support the land next to a small reservoir adjacent to the A30 dual carriageway.

6.2 Purpose

The new retaining wall will allow the proposed A30 scheme to proceed without affecting the adjacent reservoir.

6.3 Location

The new retaining wall is to be located immediately to the west of the Preeze Cross over bridge.



The construction consists of a cantilevered masonry faced reinforced concrete retaining wall 4.8m high butting up to the south eastern abutment of Preeze Cross over bridge, reducing to a height

of 3.1m over a 57m length.


A 1.4m high Cornish hedge will be set back 1m from the top of the

wall and a galvanized tubular 2 rail pedestrian fence on top of the retaining wall up-stand forming a 1m high barrier.

6.6 Features

The retaining wall will be faced with granite.


The General Arrangement for the scheme can be found in drawing

reference TRXCP311/AIP/S302.

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Prepared by:

Gavin Boyd

Project Manager (Highway Structures)

CORMAC Consultancy

CORMAC Solutions

December 2012

If you would like this information

in another format please contact:

Cornwall Council

County Hall

Treyew Road

Truro TR1 3AY

Telephone: 0300 1234 100

Email: [email protected]

www.cornwall.gov.uk

a30 temple to higher carblake - cornwall€¦ · r a30 temple to higher carblake structures notes...

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