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Trenchless replacement is the modern method of underground pipe replacement where there is no need to expose existing pipe or then remove it in order to replace with a new pipe. An open trench method of pipe replacement creates many problems, including the time it takes to carry out the work, the increased cost of the entire operation, and of course causing a significant amount of damage to the landscape. Open trench pipe replacement proves unpopular with businesses and factories because it frequently means closing down large sections of the business, and in some instances the open trench work requires closure of roads or diversion of traffic. So for many reasons pipe replacement by open trench methods has long been unpopular, and commonly avoided where possible. However, until the introduction of effective trenchless replacement technologies, the only other alternative was pipe lining or pipe curing. This is the method by which the existing pipe is not replaced, but repaired. Pipe lining involves lining the interior walls of the existing pipe with a resin which dries quickly and smoothes the pipe interior. But whilst this may be cheaper to have carried out than replacing the entire pipe using an open trench method, it also has its drawbacks. The drawbacks of pipe lining are that the solution is only very temporary, and depending on the type of liquid or material being passed through the pipe, may need to be carried out every few months. The other issue with pipe relining is that whilst it can smooth over minor imperfections and even patch small holes or cracks, it cannot deal with any large holes or cracks, and if the pipe has shifted slightly, causing a sunken section or kink, this cannot be dealt with at all. Pipes do sometimes shift a little underground, and if a section sinks slightly any fluid passing through the pipe will gather in this section, pooling and reducing the overall flow efficiency of the pipe line. So whilst it is easy to see how open trench pipe replacement and pipe curing have significant drawbacks, how can trenchless replacement overcome those problems in a way which is preferable from the viewpoints of both the contractor and the factory or business requiring the work to be carried out? Trenchless replacement begins by digging two small pits, one at each end of the section of pipe to be replaced. The pits can often be sited such that they cause no disruption to traffic or access routes. There is also no need for large heavy plant machinery or a large team of contractors - often the work is carried out by just two operators and relatively small, compact machinery. Once the pits are dug the ends of the existing pipe are exposed, and a cable is fed through the pipe from the receiving pit to the starting pit. Once the cable has been fed through it is attached to a bursting head, behind which is fitted the first section of the new pipe. Meanwhile, in the receiving pit a compact pipe bursting machine such as the Warrior WR33 pipe bursting machine is connected up to the cable, and it uses its incredibly powerful hydraulics to pull the bursting head through the existing pipe. The bursting head is fitted with a number of blades which slice through the pipe, bursting it apart and pushing the fragments outwards into the surrounding soil. This creates a cavity into which the new pipe is drawn, section by section. Once the bursting head has been pulled completely through the existing pipe, the last section of new pipe is in place, and the pits can be filled in. As the Warrior WR33 is capable of pulling through the bursting head and replacement pipe at a rate of up to 2 metres per minute, the entire job tales very little time. This is good news from the point of view of the factory or business because any closures are very brief, and the overall cost much lower than an open trench pipe replacement. Additionally, whereas pipe lining may need to be carried out every few months, a pipe replaced using trenchless replacement methods may well last for over 50 years, representing peace of mind and excellent value for money. Certainly trenchless replacement has changed the way in which underground pipes can be fitted, maintained and replaced at lower cost, with less disruption and in a fraction of the time traditional methods take.
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Trenchless Replacement | www.warriorworldwide.com | Pipe replacement
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