mill road bridge · proposed sequencing the following sequencing drawings describe how we intend to...

#ThinkSpencer www.thespencergroup.co.uk

Thameslink Stabling and Train Presentation Facilities at Cambridge

MILL ROAD BRIDGE

Proposed Sequencing

The following sequencing drawings describe how we intend to carry out the works to Mill Road bridge.

To reduce risk to the programme, advance works are being carried out between February and June in preparation for the road closure planned

from Saturday 01st July to Sunday 25th August 2019.

We have carried out several studies to identify the best option for a temporary footbridge; although this may have an impact on our construction programme, we have tried to maximise public access.

Sequencing – Existing

Existing Layout

Existing Layout

Week 2 Week 3 Week 4 Week 5 Week 6 Week 7 Week 8 Week 1

Road Closure from 01st July 2019…

Programme

Existing layout

The existing layout of Mill Road bridge showing from north of Mill Road Bridge looking towards the south.

February to end of June T-1

Footbridge Closed …Road Closure to Sunday 25th August 2019

Sequencing – Pre-works

Pre-works

Bridge Remains open to all traffic

Removal of brickwork to Archway 5

New temporary drivers walkway created

Excavation of ground below archway 6

Installation of new drainage pipework


Programme

Programme

Pre-works

Creation of a new drivers walkway will be required through archway 5 to enable works to begin below archway 6

Road Closure


Footbridge Closed Road Closure from 01st July 2019… Footbridge Closed …Road Closure to Sunday 25th August 2019

Sequencing – Pre-works

Pre-works

Bridge Remains open to all traffic

Installation of permanent stainless steel tie bars below

archway 4

Installation of temporary stainless steel tie bars

below archway 5

During tie bar works; drivers walkway will

divert through archway 6

Excavation under archway 5 to new

formation level


Programme

Programme

Pre-works

Installation of Permanent tie-bars to arch 4 and temporary tie-bars to arch 5. All works complete between Feb and June.

Road Closure



Sequencing – Stage 0

Week t-1

Bridge Remains open to vehicle traffic

Parapet to pier 7 to be removed and temporary safety measures

put in place.

Existing access gate to drivers steps to be relocated

to top of stairway

Wall around steps landing to be removed

New temporary footbridge installed


Programme

Programme

Week t-1

On the week leading up to the road closure, a new temporary footbridge will be installed to the south. We have not shown this on the following drawings.

Road Closure



Bridge width circa 2.1m. Pinch point likely to be at this point circa 1.3m

Example Bridges

At times it will be necessary to close the temporary footbridge for short periods, we will keep

the public informed of all closures in advance

It is our intention to close the temporary footbridge for a period of

5 days. This is subject to change dependant on detailed design

Technical Drawing

Public Information

It is our intention to keep the public fully informed of all closures, restrictions and also give updates on the progress of our work

Sequencing – Diversions

Day 1

Road Closed to vehicle traffic

Road Closed diversion signs erected

Fencing erected preventing all access apart from foot

traffic

Pedestrian access will be maintained

throughout

Cyclists must dismount to use temporary bridge


Programme

Programme

Road Closed

Road diversions will commence on the 01st of July. Pedestrian and cycle access will still be available via temporary footbridge.

Road Closure



Bus Replacement Service


Stage 1 visual

Bridge Closed – pedestrian access via temporary footbridge

Removal of parapets and parapet support beams

Breakout roadway and pavements

Commence excavation of material in 100mm

layers to level

Temporary closure of pedestrian walkway

may be required


Programme

Programme

Stage 1 – Road removal

01st July 2019: Removal or parapets, removal of parapet support beams, removal of footpaths and roadway, commence excavation.

Road Closure




Stage 2 visual

Completion of Excavation of material above arches

Existing services under the roadway supported

Removal of temp support props under arch 6

Commence breakout of bridge structure to

impost beam level


Programme

Programme

Stage 2 – Bridge demolition

Completion of excavation works; removal of temporary support props to archway 6; commence removal of bridge structure

Road Closure




Stage 3 visual

Installation of impost beams Impost beams secured in to

place by securing to brickwork New tie bars installed through Impost beam


Programme

Programme

Stage 3 - Install Impost beams

Continue removal of brickwork to impost beam level. Place impost beams. Secure beams in place. Install permanent tie bars under archway 5.

Road Closure




Stage 4 visual

Mobilise crane to site on prepared footprint

Once crane work complete - open temporary bridge to

pedestrians again

Precast concrete Units lifted in to place and secured in

place


Programme

Programme

Stage 4 – Install new structure pre-cast units

Once impost beams are in place, the main bridge structure pre-cast units will be lifted into place and secured

Temporary Footbridge Closed to pedestrians during daytime crane

works for a duration of 5 days

Road Closure




Stage 5 visual

Infill of below roadway back to formation level

Grouting and waterproofing of concrete structure


Programme

Programme

Stage 5 – Reinstate infill under carriageway

Installation of infill material above arch 5, grouting and waterproofing of new concrete structure, infilling between structure and rail bridge.

Road Closure



Sequencing

– Stage 6

Stage 6 visual

Build up external bridgework with reclaimed bricks to match existing

Week 2 Week 3 Week 4 Week 7 Week 8 Week 1 Week 5

Installation of parapet beams and modified parapets

Week 6

Programme

Programme

Stage 6 – Reinstate brickwork and parapets

Replacement of brickwork and completion of infill to road surface level. Replacement of modified parapets and support beams.

Road Closure




Stage 7 visual

New brick parapet construction

Reinstatement of carriageway and footpaths

Installation of new fencing to drivers walkway

Construction of drivers walkway in permanent

location

Week 2 Week 3 Week 4 Week 7 Week 8 Week 1 Week 6 Week 5 Week 7

Closure of temporary footbridge; pedestrians able to

use fenced route over bridge

Programme

Programme

Stage 7 – New brickwork parapet construction

New brick parapet constructed around precast parapet. Excavation of drivers walkway.

Road Closure




Stage 8 visual

New brick parapet construction

Reinstatement of carriageway and footpaths

Installation of new fencing to drivers walkway

Construction of drivers walkway in permanent

location

Week 2 Week 3 Week 4 Week 7 Week 8 Week 1 Week 6 Week 5 Week 7

Closure of temporary footbridge; pedestrians able to

use fenced route over bridge

Programme

Programme

Stage 8 – New brickwork parapet construction

New brick parapet constructed around precast parapet. Installation of drivers walkway to final position. Installation of driver walkway fencing.

Road Closure




Stage 9 visual

Removal of temporary bridge and replacement of parapets, walls and access gate.

Bridge fully open to all traffic following Highway’s inspection

on Sunday 25th August 2019

Week 2 Week 3 Week 4 Week 7 Week 8 Week 1 Week 6 Week 5 Week 7 Week 8

Programme

Programme

Stage 9 – Final works

Reconstruction of parapets to piers 5 & 7; including wall around drivers steps landing. Reinstatement of drivers access gate. Open bridge to road traffic 25th August.

Future Works

Road Closure



Artwork

Following consultation with the local councillors we will be providing 4 rendered

panels (2 on each side of the bridge) suitable for future artwork

THANK YOU

mill road bridge · proposed sequencing the following sequencing drawings describe how we intend to...

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