Archive for the Driven piling Category
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 ).
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.
With this project we were contacted firstly, in an advisory capacity by the architect and his engineer. Their original plan consisted of an extension to the property and too remove the roof, and build an additional storey.
The existing foundations were exposed, to verify their suitability to carry the additional load. Although the footings complied with width and depth, the ground underneath was very wet, and the clay soft and silty. Further testing was then carried out by way of two bore holes, and the results were handed over to us.
Due to the poor ground conditions, and since the existing schemes involved alterations to the ground floor layout, the client after consultation with her architect, decided upon an alternative scheme, of complete demolition and constructing a new dwelling off, Piled foundations. The house footprint will also be shifted to avoid removing the original footings.
Before being given the the contract, we helped with pricing the ground beams and Piling. Which enabled the client to understand where her budget would be going, even before they had decided to demolish the property. Due to the nature of the ground, the high water table/springs, and the loadings of the Piles, 220mm dia Steel Cased Bottom Driven Piles were the best option.
Poor access was also an issue on this site, as it was in the middle of the New Forest, and we had to negotiate fording a river, and 2 miles of rough track, which made our steel tube, and concrete deliveries challenging.
Scope of works:
*Piling mat, Pile positions and welfare facilities, were the main contractors responsibility on this project.
*Mobilise D500 and D1000h with 7.5t lorry suited to smaller access sites.
*Locate steel tube delivery and escort them to site.
*Install 32 No 220 Steel Cased Bottom Driven Piles to design depth.
*Cast all completed Piles with C35 concrete and reinforcement to our engineers design specifications.
*Place safety tops on all reinforcement.
*Clear site of rubbish and demobilise Rigs.
The D1000h Driven Piling Rig allows us to lift the driving weight over 3.0m, this means we can weld the tubes up in front, and can continually drive Piles without stopping.
This property has 2 fire places; when we arrived onsite, 2 of the piles in the fire place were too close together, so with a quick call to our engineer we were able to move the piles apart, so they were 3.5 times the diameter away from each other.
The first load of concrete is in, reinforcement inserted and safety caps placed on all protruding steel reinforcement.
All our sites are left clean and tidy, which makes the next stage of the project a lot easier for the next contractor.
Dunkeswell Bridge, Devon is an old stone built bridge which has become structurally unstable caused by the increased weight and traffic of this small arch based bridge. Unfortunately the road was closed until all works had been completed, the contract had to be finished in a short time, scale safely and without causing further damage to the bridge while it was being used as a work platform.
Scope of works:
*Install 12 No. 273mm dia Steel Cased Bottom Driven Piles to a designed set.
*Insert 12 No. 150mm dia 6mm walled steel Reinforcement.
*Concrete all piles to top of capping beam.
*Leave one chosen Pile up 500m from CSL to be tested by request of main contractor.
The road to Dunkeswell in closed untill all works are complete, by main contractor South West Highways allowing only pedestrians and cyclists safe passage. Which is why barriers and welding screens were used to prevent harm to the public.
The arch of the bridge is supported temporarily, while work goes ahead on top. And once the slab is cast over the piles the load will be transferred to them via the capping beam. Leaving the stone arch and sides of the bridge untouched.
The D1000H with built in hydraulic welder, and out riggers make for a very safe machine while operating over an excavated pile position.
All 12 piles installed to design depth, some of the driven piles had to be moved due services running under the road surface. The piles either side of the bridge, as they were being driven displaced the ground and put pressure on the sides this was also taken into account by moving them inwards.
A 150mm dia steel tube with a 6mm thick wall was inserted into each completed pile. Special skid spacers were welded to the sides of the reinforcement tube giving the correct concrete cover.The reinforcement goes top to bottom and is left 500mm below CSL which is top of capping beam, the piles were then filled with high slump, high strength concrete.
No pictures were taken of finished piles as heavy showers in the afternoon caused flash floods resulting in the road turning into a river which consequently ended in a number of piles filling with water, these were pumped out and were then ready for concreting.
3 Bedroom mid terrace house in Weston-Super-Mare,
with subsidence to the front and rear of the property. The house is positioned between a block of 5 flats and another 3 bedroom house, and on removal of the plasterboard inside it was found that the property was built with no cavity on the party wall adjacent to the flats. Both party walls are built off piled beams and the front and rear of property is built off standard footings.
Externally there are major cracks to front and rear of the brickwork and internally the aerated concrete blocks are all loose and cracked on both the first and second floor of the house.
Scope of works:
*Remove reinforced concrete floors and excavated down to bottom of slab before Piling work commences.
*Resin bond all cracks with Heli bar.
*Mobilise T5000 Rotary Bored Auger Rig which will bore 250mm dia to 5.0m reducing vibration and taking us past any obstructions before Driven Piling starts.
*Demobilise T5000 and mobilise D500 Piling Rig to drive 17 No 220 Steel Cased Bottom Driven Cast Insitu Piles.
*Demobilise D500 and concrete all Piles with reinforcement.
*Break out needles in walls front and back.
*Fabricate 250mm reinforced concrete slab.
*Remove jacks for total isolation and clear site.
While removing the reinforced concrete floors we found that the footings at the rear of the house were found to be a lot wider than anticipated and 2 Piles were redesigned and placed outside.
With all 17 No. 220 Steel Cased Bottom Driven Piles, installed to designed depth and concreted, the underside of the reinforced concrete slab is blinded ready for laying out the steel reinforcement. As there is no Heave involved in this job just insufficient footings, we are not using any void forming collapsible materials and no Anti Heave Sleeve around our Piles (Which where there is Heave involved allows the top stratum of clay to move with the changing variables of weather).
The Reinforced steel slab has been fabricated insitu and 500 x 250 needle beams have been inserted into the walls, picking up the front and rear walls and preventing them from sinking by transferring the load through the entire 250mm deep Reinforced concrete slab.
We have a H12 top and bottom mat with H16 bar’s running side by side and top and bottom around all Piles locations. The project is now ready for concreting.
All concreted and job finished.
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.