As part of its continued expansion programme, Advanced Mini Piling Systems, also operates in; Essex, Hertfordshire, Cambridgeshire, Bedfordshire, Northamptonshire, Buckinghamshire, Oxfordshire, Gloucestershire, London, Kent, Sussex, Surrey, Berkshire, Hampshire, Wiltshire, Somerset, Dorset, Devon, Cornwall, Wales.
We have also recently developed a rig to drive in solar panel posts, the posts are 2.8m long and are driven into the ground 1.8m, and will then have the photovoltaic panels attached, this method causes very little damage to the area and is very quick, no need for heavy ground works or unsightly tracks across farm land.
Sea Defences are new to us this year as we are undertaking a large Contiguous Piled wall in Devon, to protect a property from slipping into the sea, caused from weather damage and erosion of the sea.
At Advanced Mini Piling Systems we continually change our methods of piling and machines so we can compete in the modern construction industry, if we have a problem, or a job that requires a new piece of equipment to be developed, we will get it done.
Any job or any enquiry small or big, please contact us, we will help you.
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.
Piled R/C Rafts for Luxury Static Caravans, Polzeath Cornwall
Polzeath, North Cornwall, is a small seaside resort popular with holiday makers and surfers. Then a beach side piece of waste ground, is the ideal place to build a small static Luxury caravan site. As property and land prices are extremely high in this area, the need to use poor quality unused ground, that was before, thought of to be uneconomical to build upon, can now be utilized, improving the look of the town and providing accommodation for tourists.
Seven Luxury static homes are to be placed on this site, each with their own independent Piled R/C slab. The site is located at the base of the valley floor, close to the beach front, making the ground conditions very wet, due to high water table which is also affected tidally, with soft alluvial sands on top of the Polzeath slate formation.
In each individual 250mm R/C slab, there are 15 No, 150mm O/D Steel Cased Bottom Driven Piles, ( Driven piles displace the ground around them so there are no arisings to remove from site ) the piles were driven to a pre-determined set designed by our engineer based on the ground reports provided by the client. The piles were finished and concreted above the cut off level, which allows us to cut off any poor concrete. The Piling Platform installed by the clients builder was finished at top of blinding / underside of slab, allowing the us to construct the R/C slab from ground level, although we had to shutter the sides of the 250mm R/C slabs, no spoil was removed from this site saving the customer thousands of pounds in haulage.
Piled Extension in Frome, Somerset
There were many challenges on this job, the customer required 4 No triangular pads, each designed with 3 No 150mm dia Steel Cased Bottom Driven, Cast In situ Piles, to extend a 3 bedroom house. The extension is to be built between the existing house, and a public footpath, which means the new extension is triangular in shape and built right up to the perimeter fence. The access to site was down the 1.2m wide footpath, where all materials and equipment had to be manoeuvred. Upon further inspection it was found that the main sewer for the houses in the vicinity, was located under the corner of the existing dwelling and travelled down through the proposed extension. Advanced Mini Piling Systems redesigned the pad positions, and contacted the local water authorities, the answer was to move one of the pads, adding an extra pile, and pre boring all the Steel Cased Bottom Driven Piles, past the depth of the main sewer pipe, relieving the pipe of any pressure from the displaced material while the Piles were being driven.
The Piles in this pad were pre bored, beyond the depth of the mains sewer and had anti heave sleeve installed, which is the cardboard tube you can around the base of the Piles. The Piles were then driven to a pre-designed set, concreted with reinforcement, and then cut down to cut off level ( CoL ).
Jurassic Coast, Contiguous Piled Wall, Branscombe, DevonProject Brief:The site is situated on the side of Branscombe cliff, in Lyme bay. The cliff is made up of three strata, Chalk, Pre-Cretaceous Upper Greensand and Mercia Mudstone with gypsum from the Triassic era. Originally Branscombe grew from mining gypsum and the property we are working on was terraced workers cottages, with the look out on the end, a coastguard station.The Jurassic coast is a world heritage site and the rock and cliff formations have been changing for millions of years, with land slip a very common problem. Only 1km down from the site is Hooken cliffs where in the 1800’s a landslip took place containing a few million tons of chalk slipping off the Triassic Mercia Mudstone, this continual changing coastline means we need to find modern answers to solve a very old problem.This project comprise of installing a Contiguous Piled Wall in front of an old coastguards lookout, the lookout which is no longer used by H M Coast guard and is now part of private home and has been converted to suit the clients needs with a large decking, cantilevered over the cliff edge. In front of the building was mass poured concrete to retain the cliff edge and support the decking, unfortunately due to weather erosion the concrete has cracked up and is slowly slipping down the cliff, leaving the footings of the old lookout exposed.In an attempt to prevent any further movement, the whole cliff has been rock anchored and netted down while works continue. With the original decking removed scaffolding had to be erected to allow for the piling rig to work in front of the building, the scaffolding had to support a 4t point load and every other support was placed on a rock anchor.The machine we used for this job is a PPS Unwin Kitten Rig which is capable of working in restricted access conditions, and very powerful and able to bore through the tough layers of limestone. The Kitten is also able to install Temporary Cased Piles, which we are using for the bearing piles 1.5m from the centre of the Contiguous Piled Wall, this places them in the middle of the scaffolding, and any spoil or concrete would fall down the cliff causing a safety hazard. Site access and weather conditions also made this a challenging job for our team, All our equipment and reinforcement had to be delivered by 7.5t lorry as roads to site were very narrow. as the winter storms of 2014, with high tides and storm force 10 and 11, for some days the wind speeds reached 90mph with driving rain on the unprotected cliff face work had to stop as just standing up became a problem. Although we were unable to work on site, we helped clear debris from the road, restaurant and secured loose boats and peoples belongings. The high tides and high winds had washed most of the service road away which leads to several beach chalets, which were also damaged, and only 25m below our site. Storm force 10 and abnormal high tides, cause major problems on the beach front.The service road and some of the chalets have been washed away. Scope of works:* Site canteen and welfare facilities provided by main contractor.* Protect all walls and drive where we are working.* All services located and isolated.* As we are working on a cliff face all safety handrails must be installed and checked.* Mobilise PPS Unwin Kitten Rig, by 7.5t lorry.* PPS Unwin Kitten Rig chained with tether while on scaffolding.* Prefabricated 6H16 – H8 helicals @ 200mm pitch, delivered to site by us.* Pile positions set out by main contractor.* Safe route for concrete deliveries planned, and lorry walked to site by banksman.
The Contiguous Piled Wall continues along the front of the garden, although here we are working in between four cantilever beams which hold the decking over the cliff, so we are installing three Piles in each section. Because the spacing between the Cantilever beams was to small, the third Pile was installed custom essays behind the face of the wall giving it the same lateral restraint.
The Contiguous Piled Wall is installed at 600mm from the centre of the piles, to the face of the Look Out, top of reinforcement is finished at 1200mm from piling platform to allow for protrusion into 600mm x 600mm R/C capping beam.
Installing 300mm dia Temporary Cased Piles here with the Kitten Rig Prevents the spoil and concrete from falling down the cliff face, and means no operatives need to come off the scaffold.
Casing is socketed into the clay to form a seal and the pile is then formed with the casings extracted straight after concreting. These piles will have pile caps formed on top of them, which will support the new decking. Site is left clean and tidy after each day, with the access to the main house kept open and the drive power washed.
Clapham common Basement:
This was a very challenging site, with tight access on a small street, and a very small open site. The property is a modern three storey town house which was built in 2006 and was built off piled block and beam foundations. A single storey extension to the side of the property was demolished, and the piles and beams removed, to allow for the installation of a Contiguous piled retaining wall, to be installed around the perimeter of the garden, once excavated this would give the client a basement and access to excavate under the rest of the house.
Because the property is built off piled reinforced beams, these would support the building while the R/C works are taking place, and removed once the transfer slab is completed. Although the site was very narrow about 4.0m we managed to complete the piles using are largest piling rig, this allowed us to work more efficiently, as we could have the reinforced cages fabricated on site, to the required length of 10.0m, which could then be winched in to the open bores in one lift. Also our daily meter rate is higher and it requires less labour than smaller rigs keeping down costs.
Scope of works;
*Mobilise to site 14.0 t Doosan Kelly bar rig on a low-loader.
*Welfare facilities provided by main contractor.
*Loading plan put in place, with protection to the drive way.
*Safe working zone for steel fixers.
*Site marked out by main contractor using 500mm pins with caps on.
*Required number of piles installed and concreted.
*Site, pavement and road cleaned on a daily basis.
Brent knoll, Somerset
To provide 220 steel cased bottom driven piles to a pre designed set, and fabricate and cast 450 x 350mm R/C beams, for a detached garage, office and utility room. The main property is located on the Somerset levels, and surrounded by land drains which prevent the main river from flooding and carry away excess water from the farm land.
When we started the project the level of the drain was 0.6m below commencing surface level, and all piles were driven to their pre designed set, and were then concreted. After waiting for the piles to cure we then proceeded to excavate for the beams, and because of the heavy rainfall the drain level rose to 0.1m below commencing surface level, which unfortunately was 0.5m above our bottom of dig, so all the beams flooded, and we were unable to continue with work until the water level of the drains fell. We returned a month later once the water level had receded, and completed excavating the ground beams, we used a mobile line pump to concrete the beams as the access to site would not allow larger vehicles onto the driveway.
Scope of works;
*Welfare facilities provided by client.
*Check for services.
*Install 220 Steel cased bottom driven piles.
*Fabricate and install steel reinforced beams.
*Pour beams with C35 concrete.
*Clear site and leave tidier then when we arrived.
Unfortunately the perimeter of the new extension, came parallel to the bank of the land drain which had been built up by the previous owners, so as soon as we disturbed the ground near the bank, it breached the drain flooding the excavated beams. Because of the abnormal weather conditions that had been taking place, the drains were full and we left site until the water level had receded and would could continue with works.
The smaller tie beams which can be seen are 350 x 350mm these will carry very little load; the one furthest away will carry the rear of the garage wall, which is timber, and closest one in the photo will support the the block and beam floor.
Advanced mini piling systems was contracted to provide piling services for a local Property development company, based in Bath; The site is at the top of Bath over looking the whole city. There are 5 plots on the site, each with a 4-5 bedroom luxury home, 3 of the plots were based on traditional foundations, because they were on the crest of the hill and based into the natural layer of brash (local stone).
The 2 remaining properties are located on the bottom of the site below the crest of the hill, and both have basements in the their designs, so the commencing surface level would be below the layer of Brash and into the fullers earth, which meant that these 2 properties would require piling, because lateral and vertical loads could not be gained via traditional strip footings.
Our engineer choose to use 220mm dia Steel cased bottom driven piles, with a 300mm thick reinforced concrete slab. One of the problems we came across while driving the piles, was that they hit softer layer of stone which made the piles bend off vertical, this happened in every location we tried; So to save the client time and money, and as the access to the site was restricted, the option for a bigger CFA rig was out of the question. The solution we came up with, was to base the piles in the soft stone, which meant they were shallower, and double up all the heavily loaded piles.
Scope of works
*Mobilise D1000H to site.
*All 220mm dia steel cased tube delivered to site in two loads.
*Install all piles to engineers specifications.
*Reinforcement for piles.
*Set up safe location for mobile boom pump.
*Concrete all piles.
The 3.0m firsts plugged up, and ready to be driven in plumb; The D1000H can lift its driving hammer over 3.0m which means the rig can drive, while other casings are being welded together which gives us a higher productivity.
We achieved very close centres to the temporary retaining wall.
All piles concreted with a mobile boom pump and a C35 pump mix.