Soil Nailing, Stockport

Preparation for lifting road bridge deck

 

Location:  Lancashire Bridge , Stockport

Client: Bethell

Engineer: Wildes

 

soil nailing ground anchors

 

Project Overview

Stockport MBC has initiated a major town centre redevelopment involving the opening up of the river flowing through the town centre by the removal of the road bridge deck. Stockport MBC commissioned Wildes engineers to develop the engineering aspects of the scheme. The main civils contractor was Bethell of Kearsley.

Pennine was instructed to implement a scheme comprising soil nails and ground anchors. These were installed into the bridge abutments thereby stabilising the ground and enabling the road bridge deck to be removed. The site presented several challenges. 2 rows were installed via pre cored holes in the bridge deck. Due to the site configuration Pennine had to deploy both a KR82 and a bespoke excavator mounted TD308 feedbeam to install the top rows. Additionally due to the position of the bridge portals the other rows had to be installed from under the deck. This required specialist machinery, grout containment methods and scaffolding.

Pennine fabricated a purpose built feed beam and skid to both fit within the physical constraints of the under deck and the load bearing capacity of the scaffold. The bespoke drill arrangement still had the capability to install at lengths in excess of 20metres.

The work was undertaken in the critical pre Christmas shopping period so Pennine worked at nights ensuring no daytime interruption to the public.

 

Result

Installation of 35 nails & anchors

Installed at depths of up to 36metres

Ischebeck inox 30/11 bars

Stainless steel 500x500x20

  

Technical Information

KR802 crawler rig c/w 1011 drifter drilling head

Pennine excavator based feed beam c/w Krupp HB35 drifter

Ripamonti skid based mast