acrow northside bridge

8/13/2019 Acrow Northside Bridge

1/12

A-PLANT ACROWFORMWORK SOLUTION FOR NORTHSIDE BRIDGE


2/12


3/12

Name: A-Plant Acrow Cantilever Formwork Solution for Northside Bridge

Location Where Used: Northside Bridge, Workington

Address: Ashtead Plant Hire Company Limited, 102 Dalton Avenue, Birchwood Park, Warrington WA3 6YE

Web: www.aplant.com/acrow

Telephone No: 01925 281000

E-mail: [email protected]

To watch a film about the project visit www.youtube.com/aplanthire

3A-PLANT ACROWFORMWORK SOLUTION FOR NORTHSIDE BRIDGE

www.aplant.com/acrow


4/12




5/12




6/12




7/12

An Introduction to the Project

In November 2009, Workingtons Northside Bridge was swept away during devastating floods in Cumbria,

tragically killing PC Bill Barker who was on the bridge diverting traffic. The collapse of the landmark bridge

effectively split the town in two, resulting in an 18-mile round trip to get from one end of Workington to

the other. Following the collapse, the Army erected a temporary footbridge named Barkers Crossing

in memory of Bill Barker and this was dismantled to allow for a multi-million pound construction of

Northside Bridge.

The works involved the fabrication and construction of a 152m three-span composite steel/concrete

highway bridge, being erected in the same position as the former structure over the River Derwent. The

bridge reinstated pedestrian, vehicular and cycle access along the A597, which provides the main highway

link to Workington from outlying areas. The structure is supported on concrete piers with bored pile

foundations. The completed bridge was clad in sandstone, similar to that used on the original structure

with reclaimed stone. Sandstone blocks were actually recovered from the collapsed structure of the bridge

and stored for re-use in the replacement.

The construction project was funded by the Department of Transport at an approximate cost of 11 million.

Carried out over a 50+ week contract, A-Plant Acrow worked alongside the contractors Birse Civils and

Mabey Bridge, the supplier of the steel beams, to provide a unique solution to help Workington become

connected once again.




8/12

Cantilever String Course Formwork Solution

A-Plant Acrow was heavily involved in the consultation and design process for the new Northside Bridge.

Through this we were awarded the work for the supply of the formwork for the pier bases, along with

producing detailed schemes for the North and South abutments, which included design for a specially

fabricated formwork end bull nose using Slimlite Soldiers and Mammoth Panels so the abutment could be

cast as one.

Following several visits to site, the experienced A-Plant Acrow Sales and Engineering Team devised a

bespoke solution using a range of Acrow formwork products. Primarily based on the ESS21 Parapet

Support System developed in-house, A-Plant were able to utilise our expertise in the market to ensure that

Birse Civils and Mabey Bridge had a cost-effective, flexible and practical solution to enable construction of

the bridge that had a curve on plan and elevation with inclined soffit on the cantilever.

The ESS21 parapet formwork is a system of components that allows the user to construct cantilever

formwork off the edges of steel beams. For this project it was clear from the start that due to the complex

curve and slope on the new bridge we would need to provide tables of various lengths to fit its geometry.

As part of the agreement the contractor built all the tables in the yard at the A-Plant Acrow depot in Glasgow

and tagged the tables with a code number. With the aid of two yard staff and a forklift for their use they

completed the tables in just one week, which enabled a significant cost saving for the table assembly. The

system was of further benefit to the construction of the bridge deck cantilevers and as there was no lay downarea on the site where the tables could be built.

A-Plant then delivered all the items to site, and by creating a temporary jig onsite the contractor was able to

basically clip and pin all the parts together quickly and efficiently, before they were lifted into place. Once

lifted the tables were connected to bridge beams via a simple triangular frame that was tied back using a tie

rod. This then provided the base to set the forms and cast the concrete.

The bridge cantilever formwork was erected to provide access along each edge and allow the sequential

pours to be carried out. The design called for loads to be applied from the new deck in a precise process to

ensure stability while the structure was being constructed. Due to the complex nature of this project, withsome of the bridge being over a road and some over water, the formwork was attached to the beams at

various stages before eventually the main 66m and 88t centre beams were spectacularly and with expertise

precision lifted by crane into place.

Opened by Princess Anne in October 2012

A-Plant Acrow is proud to have played such a

key role in facilitating construction of this new

structure.




9/12

Drawings or Plans Demonstrating the

Innovation




10/12




11/12




12/12

acrow northside bridge

Documents