View Expired Tender

Get immediate access to tenders like the one below by subscribing now to Tenders Direct. We will set up your personalised profile and send you tender alerts direct to your mailbox as soon as they are published. You will also benefit from having access to historical tenders.

Notice Summary

Title:
UK-London: WP227 Network Rail Mitigation Works - Hydraulic Jacking Frames
Document Ref:
GB003ZM331769
Document Type:
Contract Notice - Open Procedure
Published By:
SCS Joint Venture
Date Published:
02 June 2020
Deadline Date:
10 June 2020
Document Source:
Framework/DPS:
No
Alert Profile:
Labels:

Notice Abstract

HS2 Main Works - WP227 Network Rail Mitigation Works - Hydraulic Jacking Frames Skanska Costain Strabag Joint Venture (SCSJV) are seeking a supply chain partner for the provision of Hydraulic jacking works on the HS2 Main Works Civils Contract Area South. Hydraulic jacking works are required for two bridges in the Euston Area; Bridge 7 and Mornington Street Bridge. Both bridges will require jacking (the Subcontractor is required to provide necessary hydraulic jacking system and undertake works to align with scope requirements). *Structural strengthening and integrated I&M solution to monitor movements of the bridges (to be procured under WP227.1 package, advertised as a separate CompeteFor opportunity)* Works will require isolation and possessions to be undertaken. These packages should include for prep work, design input and installation. Subcontractor may be required to lead on some detailed temporary works design which will be confirmed. All works are to be undertaken during a period of rail possessions called the line X blockade which cannot be moved and is a fixed period of time. This period is from 27-Jul-21 to 29-Aug-21. There are possessions prior and post blockade of varying hours and suggestions from subcontractor would be considered for some scope that could be undertaken safely outside of the blockade. Outline of structure - Bridge 7 • This is a heavily skewed rivetted steel structure. • The bridge comprises four sets of four main beams, each set under one track of the main lines: A, B, C and D. • There are also two side beams running parallel with the main beams. • The tracks and sleepers are now supported on ballast approx. 200mm over the top of the main beams. • There is a diagonal track crossing and turnout on bridge 7. • All lines have OHLE, B&C also have third rail. The main beams span continuously from abutment to abutment, with a central support on a trestle structure. The main beams are I section and fabricated from rivetted steel plate, and are cross-connected with similar steel diaphragms, perpendicular to the main beams. The deck spans over the undershoot structure, which comprises of an invert and two long wing-wall – abutment – wing-wall retaining systems. The trestle stands near the centre of the span and comprises of vertical columns founded on a brick foundation. A fabricated I section steel cross-head sits on top of the columns, and the columns are diagonally cross-braced with lighter members. The main beams are supported through folding wedges, of the cross-head. • There are areas of corrosion on the deck structure, especially on the side beams, and in local instances on the main beams, where water has penetrated. Preliminary Proposed solution for the bridge • Option 1 Jacks to be installed under the columns of the trestle, to provide load monitoring, and redistribution in the event that central pier loads vary by more than X%. (X% to be determined with input from specialists). • Option 2 Jacks to be installed under the longitudinal girders on top of temporary trestles. • Option 3 Replacements of existing pier trestle with new isolated columns. Subcontractor is to provide feedback on, and support the review of options stated above. The subcontractor is also free to suggest any further options to be considered as a viable alternative. The subcontractor shall be required to price based on Option 2, with deltas shown for Options 1 and 3. Consideration will need to be given to the sensitivity of the jacking system. Feedback is requested from the Sub Contractor regarding: . Proposed arrangement of the jacks, . Method of modifying the central pier (trestle) so that jacks can be operated independently, or together, to fulfil the proposed function, without overloading the cross-head. . Tolerances that could be achieved for vertical position of the jacks (expected to be sub-millimeter.) . Methods of monitoring displacement and load, . Equipment selectio

Notice Details

CONTRACT NOTICE – NATIONAL

WORKS

1 Authority Details

1.1

Authority Name and Address

SCS Joint Venture
N/A
London UK
N/A N/A
N/A

1.2

Address from which documentation may be obtained

As in 1.1

1.3

Completed documents must be returned to:

As in 1.1

2 Contract Details

2.1

Title

WP227 Network Rail Mitigation Works - Hydraulic Jacking Frames

2.2

Description of the goods or services required

HS2 Main Works - WP227 Network Rail Mitigation Works - Hydraulic Jacking Frames

Skanska Costain Strabag Joint Venture (SCSJV) are seeking a supply chain partner for the provision of Hydraulic jacking works on the HS2 Main Works Civils Contract Area South.

Hydraulic jacking works are required for two bridges in the Euston Area; Bridge 7 and Mornington Street Bridge. Both bridges will require jacking (the Subcontractor is required to provide necessary hydraulic jacking system and undertake works to align with scope requirements).

*Structural strengthening and integrated I&M solution to monitor movements of the bridges (to be procured under WP227.1 package, advertised as a separate CompeteFor opportunity)*

Works will require isolation and possessions to be undertaken. These packages should include for prep work, design input and installation. Subcontractor may be required to lead on some detailed temporary works design which will be confirmed.

All works are to be undertaken during a period of rail possessions called the line X blockade which cannot be moved and is a fixed period of time. This period is from 27-Jul-21 to 29-Aug-21. There are possessions prior and post blockade of varying hours and suggestions from subcontractor would be considered for some scope that could be undertaken safely outside of the blockade.

Outline of structure - Bridge 7

• This is a heavily skewed rivetted steel structure.

• The bridge comprises four sets of four main beams, each set under one track of the main lines: A, B, C and D.

• There are also two side beams running parallel with the main beams.

• The tracks and sleepers are now supported on ballast approx. 200mm over the top of the main beams.

• There is a diagonal track crossing and turnout on bridge 7.

• All lines have OHLE, B&C also have third rail.

The main beams span continuously from abutment to abutment, with a central support on a trestle structure. The main beams are I section and fabricated from rivetted steel plate, and are cross-connected with similar steel diaphragms, perpendicular to the main beams.

The deck spans over the undershoot structure, which comprises of an invert and two long wing-wall – abutment – wing-wall retaining systems. The trestle stands near the centre of the span and comprises of vertical columns founded on a brick foundation. A fabricated I section steel cross-head sits on top of the columns, and the columns are diagonally cross-braced with lighter members. The main beams are supported through folding wedges, of the cross-head.

• There are areas of corrosion on the deck structure, especially on the side beams, and in local instances on the main beams, where water has penetrated.

Preliminary Proposed solution for the bridge

• Option 1

Jacks to be installed under the columns of the trestle, to provide load monitoring, and redistribution in the event that central pier loads vary by more than X%. (X% to be determined with input from specialists).

• Option 2

Jacks to be installed under the longitudinal girders on top of temporary trestles.

• Option 3

Replacements of existing pier trestle with new isolated columns.

Subcontractor is to provide feedback on, and support the review of options stated above. The subcontractor is also free to suggest any further options to be considered as a viable alternative. The subcontractor shall be required to price based on Option 2, with deltas shown for Options 1 and 3.

Consideration will need to be given to the sensitivity of the jacking system. Feedback is requested from the Sub Contractor regarding:

. Proposed arrangement of the jacks,

. Method of modifying the central pier (trestle) so that jacks can be operated independently, or together, to fulfil the proposed function, without overloading the cross-head.

. Tolerances that could be achieved for vertical position of the jacks (expected to be sub-millimeter.)

. Methods of monitoring displacement and load,

. Equipment selection, method of installation, and methods of processing and conditioning signals to achieve reliable signal to noise ratio.

. Preliminary consideration regarding installation of the jacks and ancillary equipment.

Outline of structure - Mornington Street Bridge

- The bridge is a three span structure, carrying a road transversely over the Euston Throat.

- The primary structure of the bridge is a rivetted steel structure.

- The bridge comprises sets of parallel main beams under the roadway, supported at abutments and two piers. The main beams are not continuous over the supports, but have been connected. The consequence is that there is some scope for each span to act independently.

- The centre span spans Main lines A, B, C and D. Line X and sidings approaches pass under the north-eastern span, and Line E passes under the south-western span.

The main beams are I section and fabricated from rivetted steel plate, and are cross-connected with similar steel diaphragms, and jack-arch ties, perpendicular to the main beams.

The deck spans over the line X undershoot structure. However, it is not anticipated that works will be required on this span.

The piers comprise columns under the main beams with cross-bracing, on a brick foundation. A fabricated I section steel cross-head sits on top of the columns. The main beams are directly supported on the cross-head.

At the abutments there are bearing shelves, and evidence of bearing plates for movement. However, there is no sign of a movement joint in the road, nor any sign of movement induced cracks. The implication is that the bearings have seized.

There are substantial brick parapets, terminated with finials at the abutments. The finials are of architectural significance and there is permission to remove and store these elements for the period of the works.

- There are areas of corrosion on the deck structure.

Preliminary proposed solutions for the bridge

Jacks to be installed under the deck, at high level:

. on SW pier (on brackets or trestles tied to the pier) OR with jacks at the underside of the existing columns and

. on a concrete plinth in-front of the abutment bearing shelf.

One jack per beam or as sub contractor recommends.

The jacks are primarily to provide:

. A means of replacing the bearings at the abutment, and install a new movement joint at this location (also in this scope), and

. displacement control to the abutment end of the deck and at the SW pier.

This will be effected by displacement monitoring and control, preliminary estimates for the expected ranges for the jacks are -50 to 110mm at abutment and -25 mm to 60mm at the first pier.

Load monitoring is a secondary function of the system.

Consideration will need to be given to the jacking system. Feedback is requested from the Technical Specialist regarding:

. Proposed arrangement of the jacks,

. Method of mounting the jacks on the pier and at the SW abutment, so that jacks can be operated independently, or together, to fulfil the proposed function, without overloading the cross-members in the deck near the supports.

. Tolerances that could be achieved for vertical position of the jacks (expected to be order of a millimetre.)

. Methods of monitoring displacement and load,

. Equipment selection, method of installation, and methods of processing and conditioning signals to achieve reliable signal to noise ratio.

. Preliminary consideration regarding installation of the jacks and ancillary equipment.

. A blockade of Line E is available for installation of equipment. However, it is unlikely power to line D can be isolated. This will constrain activities at the SW pier. It additional permissions are required, for example to isolate the overhead lines in this area, identification of this need is an early priority.

The subcontractor may wish to additionally tender for the WP227.1 Structural Strengthening works which is advertised separately on CompeteFor.

You are invited and encouraged to respond to this publication if you wish to be considered for the works.

Suppliers should be aware of the scale of this project and should assess their internal capacity and capability in relation to the intended scope of works, prior to completing this expression of interest (EOI).

2.3

Notice Coding and Classification

2.4

Total quantity or scope of tender

Estimated contract start date : 19/11/2020

Delivery point : HS2 route from London Euston to Ruislip

3 Conditions for Participation

3.1

Minimum standards and qualification required

4 Administrative Information

4.1

Type of Procedure

Single stage - Any candidate may submit a tender.

4.2

Reference number attributed to the notice by the contracting authority

n/a

4.3

Time Limits

   10-06-2020  Time 16:30

4.5

Language or languages in which tenders or requests to participate can be drawn up

EN 

4.6

Tender Submission Postbox

5 Other Information

5.1

Additional Information

Please register as a supplier on the following portal to participate:

https://www.competefor.com

Competefor Response Deadline : 10/06/2020 at 16:30 hrs

(MT Ref:331769)

5.2

Additional Documentation

5.3

Publication date of this notice

 02-06-2020

Current Notes