Concrete groundwork - Newton-le-Willows, Lancashire.
- Robert Mawdsley Jr.
- May 8, 2016
- 2 min read
The last week we have begun another pit construction. Our client requires a 3.9m x 1.9m pit at a depth of 760mm. In this will sit a scissor lift that will be required to raise many tons of materials in single lifts.
Our first job was to mark the area that would be recessed and then added a further 200mm around the entire perimeter to allow working room and to give out new retaining walls a minimum of 200mm thickness. Once the area had been marked we used our Husqvarna FS 400 LV floor saw to diamond cut the existing floor to a depth of 200mm so that when we begin to break the area out, the concrete that will remain would not be damaged or stressed.
Once the area had been cut we then broke out the concrete using our rubber tracked 3 ton Kubota and terex breaker. The rubber tracks ensure that no damage would be caused by the machine moving around on the warehouse floor. The area was then excavated to a depth of 1010mm.
After we had removed all hardcore and leveled the pit floor to 1010mm below finish floor level, the area was compacted and a damp proof membrane was installed along with mesh reinforcement.
The pit floor was then poured at a thickness of 250mm due to the weight or the scissor lift on the weight or the loads it could be potentially lifting.
After the pit floor had been given sufficient curing time we then drilled in rebar that would tie the walls to the pit floor and also tie the existing concrete to the walls. A252 mesh was tied to the dowel to give the wall strength.
Pan shutters were erected which would allow us to cast our reinforced concrete walls.
A strong concrete mix was then poured into the void and vibrated using a poker to remove any air from the mix, increasing the walls strength.
After a days curing the shutters were then stripped and the pit cleaned ready for use after another week of curing.
Another pit installation and more concrete walls cast that are millimeter accurate.
