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Following discussions with its rental customers Colets Piling acknowledged there was a need for a piling rig to top drive steel or concrete foundation piles for small to medium-sized housing projects. The main criteria for the new rig included ease of transportation without the need of movement orders, secondly a reduction in the costs of piling mats for the rig to operate on as this aspect can significantly increase the cost of a housing development and thirdly, increased productivity with quicker set-up, faster drive times and reliability. “As BSP is one of the world’s leading manufacturers with over 110 years’ experience in designing and building foundation equipment we decided to approach them to collaborate with us in the manufacture and development of an excavator-mounted piling rig, built to our recommendations and specifications,” says John Walter, Colet’s sales manager. “This collaboration has resulted in the JX model, the first purpose-built piling rig of its type in the UK which was built and ready for work in 6 months.” “BSP is delighted to have been approached by Colets Piling to participate in the design and build of the new JX rig,” says Ray Ransome, BSP’s senior sales manager. “During the building process we encountered a few technical problems but these were resolved quickly with minimum production delay. Now that the machine is working in the piling field, we are extremely confident it will prove to be a valuable addition to the Colets Piling fleet and ultimately provide many years of productive service,” he adds. To provide the base machine Colets Piling chose JCB to supply a number of JS excavator base units. These machines have already been introduced into the company’s contract and rental fleet in rotary drilling versions. A standard JS200 excavator with a 20 t operating weight and equipped with JCB’s latest Tier 4 final emission compliant diesel engine developing 129 kW, was supplied as the base machine but with a number of subtle changes to optimize the stability and performance of the completed JX unit. As part of its involvement in the project BSP offered 2 hammer options. The JX20-6 fitted with a 1.5 t dropweight and a 10 m long mast or a JX25-8 fitted with a 2 t dropweight hammer and a 13 m long mast. Research showed more interest in a machine that could cope with 8 m long piles, so the JX25-8 was the preferred option. A key technical point of the project is the overall mass of the JX25-8 rig which exerts a ground pressure of only 0.57 kg/cm2, further reduced once the hammer is in place and sitting on the pile – as the pile takes the weight of the hammer. The rig then only guides the pile into the ground while the hammer is driving. The JX square track configuration of the base provides maximum stability during driving. One of the first projects involving the JS Rig was the driving of concrete piles on the 3rd phase of a new housing development being built by Bovis Homes in Congleton, Cheshire. The new rig was hired to Tritech Piling & Foundations by Colets Piling to drive 200 mm square concrete piles between 6 and 7 m in depth on the site. All the piles were driven to a set with the DX hammer performing a 300 mm long stroke. Tritech operator Karl Amos was able to achieve a production rate of 150 linear meters driven per day. |
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BSP and Colets Create New Piling Rig
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