Case Studies

Special Projects

Vinci/Eurovia - Streatham Hub

Block Paving works carried out by TAG Personnel in difficult conditions and time constraints to get the Store and Leisure Centre open by 18th November 2013.

OSBORNE - M25 Junction 8 - 9

PQ Bay Replacements to the clockwise carriageway between junction 8 and 9 using Rapid Curing Pavement Quality Concrete (developed by Balfour Beatty).

An extremely challenging project that we helped Osborne plan and execute for Connect Plus.

The scope of works was the same as the works completed for SKANSKA: Diamond saw and stitch drill an existing bay into four 3.8t sections, remove the bay, drill and fix dowels and place the Rapid curing concrete, the only difficulty was this has to be carried out in an hour and a half to allow curing time in order to open the M25 to traffic at 0500hrs.

We had a 5t vacuum lifting unit made which enables us to remove the bay in nine minutes, the grab lorry was modified so that the sides drop down for loading and an access door built into the headboard so that the operator can access the body to release the valve on the vacuum unit.

The dowels where drilled using two EZ Drills (slab riding drill), these eliminate HAV issues and enabled us to drill and fix the dowels in fifteen minutes.

The concrete is placed conventionally with high frequency pokers (minimum of four), a Bunion tube and finished with a power float.

Tents are erected over the bay and space heaters maintain the slab at 35 degrees for curing.

 

Testimonial from Jamie Harrison - Framework Manager

Osborne

On behalf of Osborne and our team involved, I wanted to thank you and your colleagues for your help in completing the works to replace the concrete bays recently.

Thank You for all your efforts in carrying out the bay replacements in such a professional manner, in often challenging conditions.

We look forward to working with you again in the near future.

SKANSKA - M25 Junction 8 - 9

PQ Bay Replacements to the clockwise carriageway between junction 8 and 9 using Rapid Curing Pavement Quality Concrete (developed by Balfour Beatty).

An extremely challenging project that we helped Skanska plan and execute for Connect Plus.

The scope of works was quite straightforward: Diamond saw and stitch drill an existing bay into four 3.8t sections, remove the bay, drill and fix dowels and place the Rapid curing concrete, the only difficulty was this has to be carried out in an hour and a half to allow curing time in order to open the M25 to traffic at 0500hrs.

We had a 5t vacuum lifting unit made which enables us to remove the bay in nine minutes, the grab lorry was modified so that the sides drop down for loading and an access door built into the headboard so that the operator can access the body to release the valve on the vacuum unit.

The dowels where drilled using two EZ Drills (slab riding drill), these eliminate HAV issues and enabled us to drill and fix the dowels in fifteen minutes.

The concrete is placed conventionally with high frequency pokers (minimum of four), a Bunion tube and finished with a power float.

Tents are erected over the bay and space heaters maintain the slab at 35 degrees for curing.

This method will be repeated in September with Osborne on the next section and will constantly evolve/ develop as new improvements are thought of.

LaFarge Tarmac - London City Airport

PQ Bay Replacements to the Runway and Taxi ways using LaFarge Tarmac P450 High Early Strength Concrete.

LaFarge Tarmac carry out a wide range of works within their term maintenance contract with London City Airport, Tag Construction Ltd carry out the PQ Bay Replacements on weekend closures to a very tight programme.

We generally get possession just after 1300 hours, we mobilize airside and diamond saw cut an average of six bays (depending on the location and proximity). We break out the bays using RBD`s and load the arisings to grab lorry`s. The bays are prepared and the concrete placing commences at 1430 hours, this concrete is very difficult to place due to the speed that it cures (40N at twelve hours), works are completed by 1700 hours and we hand back to operations the following morning at 1000 hours. This work involves a lot of planning and the programme is split into activities scheduled every fifteen minutes. Tag has developed this method with LaFarge Tarmac over a number of years and is very successful.