Screw Piles Battersea Park
Being a diverse company, Advanced Mini Piling Systems, which over the years has built up a knowledgeable team of engineers and operatives. So when contacted by a successful high rope adventure company, to install Screw Piles in Battersea Park London, we were able to quickly design and advise the best way to secure the multiple high tower climbing platforms to the loose ballast, located in Battersea Park London.
The contract involves installing 89mm dia Steel Galvanised Screw Piles into pre excavated pits shored up with temporary shutters, the screw piles are installed to a pre designed installation torque, the number of screw piles and depth is determined by height and loading of the climbing tower. Our Screw Piles are finished off inside the pile cap to allow enough protrusion for the connection of the two, reinforcing bar is placed through the pile, connecting pile cap to Screw Pile.
As the site is situated in a public park only certain areas were closed, each pad was to be excavated, piled, reinforcement installed and hold down bolts setup, which consisted of 16 number M36 threaded bars held in place by 2 number 25mm laser cut steel plates, connecting climbing platforms to our Screw Piled, Reinforced concrete Pads.
The High ropes adventure area consists of a mixture of free standing platforms and walkways built into existing mature deciduous trees. On the plan; green and red are trees, red are single towers which are piled with 4 number Screw Piles, and the brown blocks are large multi level platforms with a multiple configuration of Screw Piles.
This photo shows the 22kNm torque head mounted onto an 8.0t excavator, installing the screw piles, which are in 3.0m sections and connected via a spigot and socket with 3 number M20 bolts. The pad has been pre excavated to the correct height and temporary form work setup ready fix steel reinforcement.
M36 hold down bolts to be set, when pad is cast, connecting Screw Piles to tower. Ground protection was used around the whole site preventing compaction of tree roots, in Battersea Park.
Single platform high rope tower, to be fitted on pads with 4 number screw piles.
The Screw Pile Torque Head gauge allows us to see when we have reached our pre designed installation torque, in kNm as we are working.
Screw Piles finished ready for main contractor to complete works and reinstate play ground for the public users of the Battersea Park adventure play ground.
Camden Town Piled Basement London
Advanced Mini Piling Systems, was contracted to install 3o number 450mm dia Hollow Stem Contiguous Piles, for a basement in Camden Town, London. Access was restricted as the site was at the rear of a 6 storey London town house but once on the site, room was of abundance. The Rig used to install the 450mm dia Hollow stem piles was a Klemm KR 702-2, with a silent power pack and safety cage fitted to the rig, with an operating height of 2.5m – 3.5m and a width of 1.8m, the 702-2 can also be used 25m away from its hydraulic power supply. Two parking spaces were allocated for a concrete pump and wash out area, concrete was delivered to site twice a day on a 6.0m3 lorry, and all other materials were stored at the rear of the property.
The Contiguous piles are being used to extend the existing basement which is not lived in but used for storage, and is due to be converted to a luxury flat, the Contiguous Piled Retaining Wall is situated parallel to the rear of the building allowing room for a court yard and a fire escape. This complies with building and fire regulations granting the conversion of an unused space.
Klemm KR 702-2 being hiabed off lorry.
Klemm 702-2 installing 450mm dia Hollow stem piles, a winch is fitted to lift heavy flights on to auger rig. Although a large machine, close proximity of the building is maintained, allowing us to work down the centre line of the Piled Retaining wall.
Once the safety cage is opened the Rig is isolated and spoil can be removed safely by an operative.
Piles cages fabricated on site, with 75mm spacers.
Piled Basement in Banbury, Oxfordshire
To provide 81 number 300mm dia hollow stem piles to 9.0m to form a Contiguous Piled Retaining Wall, allowing for the patio area to be enlarged, by excavating the bank at the rear of the house. The Contiguous Piled wall also forms the steps to lead from the drive down to the patio. The bank is made up of clay, with layers of ironstone, and in most areas is very soft with running water, which is why the chosen piling system is Hollow stem.
The Hollow stem Piles were grouted (a concrete substance made up of sharp sand and cement at a very strong ratio) onsite with a pump and batched by hand. The cages were pre fabricated and consisted of two sections to gain 9.0m, which are bolted together using high strength wire rope clips, which are then plunged through the newly formed pile that has been grouted as the augers have been removed.
Photo of drawing, with the black dots showing the Contiguous Piles, forming the retaining walls and steps.
Pile positions clearly set out and numbered, by client ready to commence piling.
The PPS Unwin Kitten rig being used with 300mm dia Hollow stem flights, a very powerful yet compact Piling Rig, with grout hose to rotary head.
As we are pumping grout to the bottom of the pile, the water in the pile is forced to surface, making the site very wet, so a good piling mat is needed, to maintain a stable platform for safe manoeuvrability and consistent verticality of the piles.
Continuing the Contiguous Piled wall through restricted areas is no problem, even with delicate masonry and protected trees undamaged.
Although the clay looks very good from this photo, in some areas of the Contiguous Piled wall, we came across large boulders of Ironstone (Ironstone is a sedimentary rock, either deposited directly as a ferruginous sediment or created by chemical replacement, that contains a substantial proportion of an iron compound from which iron either can be or once was smelted commercially). Which is extremely hard and very common for this area of Oxfordshire; we were unable to auger through these obstructions which were located around 4.0m from ground level, so excavation was not viable. With discussions and transparency from us at Advanced Mini Piling Systems with the client, we were able to agree a solution for the obstructed piles numbering 7 in total. Ours and the clients engineers omitted the 7 number piles and redesigned the R/C works.