Infrastructure – Hydraulic Bridge Jacking and Propping Supports

A1 Leeming to Barton (L12B), Agricola Motorway Bridge

Highway Agency

Description of Project

The 12 mile section of the A1 between Leeming and Barton carries between 59,000 to 69,000 vehicles per day. It has poor alignment with many side road junctions, farms and field accesses. The accident rate is broadly in linewith the national average for older dual carriageways, but the severity ratio is significantly higher. Incidents often lead to full closure of the route with lengthy diversions. This is the only section of non-motorway on the strategic M1/A1(M) route between London and Newcastle.

The estimated final outturn of £380 million and development of the infrastructure and bridge are all being upgraded to conform with motorway highway standards

Hydra Capsule we commissioned to design a hydraulic jacking system to synchronously lifting a compete bridge deck consisting of 100 number hydraulic cylinders (ranging from 100 tonnes to 180 tonnes) across two abutments and two supporting piers for bearing replacement works.

Professional Services

The complete works were carried out in normal working hours, with "live" traffic across all six carriageways during the jacking and lifting operations.

The hydraulic system employed, ensured each support beam(s) were lifted accurate to +/- 1.00mm differential throughout each 24 jacking points per support.

In total, the complete consisted of the bridge support decks to be lifted +10.00mm and isolated on the hydraulic jacks' mechanical locking-collars. To allow all the necessary bearing locations to be refurbished and/or replacement accordingly.

Project Features

  • Hydra Capsule’s Synchronised Jacking System (+/- 1mm accurate)
  • Human Manual Interface (HMI) Control Panel (live trends, digital outputs)
  • Multi-flow Pumps
  • Hydraulic bridge jacks
  • Jacking and Propping solutions
  • Real-time and remote monitoring for the jacking and structure

Duration of Works

June 2015 to July 2015.

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