Motorway Bridge S102 - M73 Motorway

Bridge N^o. S102, M73 Motorway

CLIENT:

Ferrovial Agroman Laggan Join Venture

LOCATION:

M73 Motorway

DATE COMMENCED:

15^th May 2015

DURATION:

2½ Days

ACCIDENTS/INCIDENTS:

0

RECYCLE RATE:

98%

CONTRACT VALUE:

Circa £75,000

BACKGROUND:

Transport Scotland appointed Ferrovial Agroman Laggan Join Venture as Principal Contractors for M8, M73 & M74 Motorway Upgrading & Improvements.  Due to a very a competitive tendering procedure George Beattie & Sons Ltd were awarded this demolition subcontract that mainly had to be carried out during times when the motorway was least busy

Scope of Work

Removal of complete structures to 1m below road surface. All works carried out with full road closure [by Principal Contractor].

Protection & Enabling Works Required

• Installation of carriageway protection
• Welfare Facilities provided were situated at Compound 7J
• Task Lighting erected.

Plant used on Project

• 3 x 35T Demo Rig/hammer/crackers/grapple
• 3 x 30T Demo Rig/hammer/crackers/grapple
• 1 x 15T Demo Rig/Hammer/Crackers/grapple
• Dust Boss – Generator
• 23mm steel Plates 6m x 3m – 15no
• Terram
• Dumper Truck
• Articulated Hiab (Placement of steel plates).
• All materials used to protect the carriageway was delivered and stored within the 7J Compound area prior to the works commencing on the carriageway.
• These materials were delivered by tipper lorry and deposited onto the carriageway by tracked excavator.

Site Procedures

• 6F2 material and protection plates were delivered to 7J compound from Tuesday 12^th May at 9am.
• Identification of all known services, service lines near to the works and current status of services and recording in the Health & Safety File.
• Client disconnected services and identification of disconnection points.
• Acceptance of service disconnection proof from relevant services and incorporation in Health & Safety Plan.
• Inspected site for hazardous, contaminated or other materials and report to CDM Coordinator
• Action to properly deal with hazardous, contaminated or other materials found
• Proof given of Insurance.
• Japanese Knotweed was present at the east abutment. This was removed by FLJV prior to works. During the demolition works of this abutment a competent person inspected the material under the embankment – no further Japanese Knotweed was found
• Accessed laydown area with all plant and equipment. Carried out pre-work inspection.
• When instruction given and all permits to work signed, commenced to transport protection onto carriageway.
• Manually rolled terram over area of works. Covered all road gully’s adjacent to works.
• Accessed carriageway will flat-bed and trailer loaded with steel and placed on to top of terram. Steel plates were lifted with excavator with magnet attachment.  Cover 8m out from each side of bridge.
• With steel plates in place, started to move excavators on to carriageway and proceeded to load dumper with 6F2 and by machine, spread over steel plates to a depth of 500mm.
• Plant included: 1 x 35T Demo Rig/hammer, 1 x 30T Demo Rig/hammer. 1 x 30T Demo Rig/hammer/cracker jaw each side of bridge deck on carriageway
• Working from top of carriageway, started to remove center span of bridge, removing 1m strips from center span, allowing materials to drop down onto protection
  • Continued to work both sides of the bridge deck. With center span removed, proceeded to remove both approach spans. Worked from carriageway back to bridge bolts.
  • Replaced hammers on 2no 30T machines to grapples. Lifted out rebar and loaded to transport. Replaced hammer on 2no 35T with pulverizes and processed materials for loading to transport
  • Accessed work site with 2 x 35T dump trucks and proceeded to load by excavator. Hauled materials to laydown area.
  • As clearance work progressed, reduced the piers, working from top down to 1m below road level
  • Excavated material from pier to expose rebar and manually hot cut flush. Removed steel and backfilled with clean concrete to surrounding area.
  • With bridge removed to engineer requirements, proceeded to remove carriageway protection. By excavator loaded crush from top of steel plate to dumper, hauled to laydown area.
  • By magnet, lifted steel plates to dumper. Hauled to laydown area
  • Manually rolled Terram from top of road surface and removed to laydown
  • Accessed road surface with sweeper and cleaned carriageway.
  • Carried out visual survey of all surfaces.
  • With full inspection and clearance given, re-opened road to general traffic

ACHIEVEMENTS & SUCCESSES:

All work was carried out successfully, on time and on budget all to the satisfaction of Ferrovial Agroman Laggan Joint Venture and Transport Scotland.