• Categories:Engineering case
• Author:
• Origin:
• Time of issue:2020-04-01 09:55
• Views:

(Summary description)Pipe jacking construction is an underground pipeline construction method. It does not need to excavate the surface layer and can pass through roads, railways, ground buildings and underground pipelines. At present, pipe jacking construction technology has become a conventional construction method. Many pipelines such as water pipes, gas pipes, power cables, communication cables and power plant circulation systems have also adopted pipe jacking construction technology. Especially in sewage treatment projects, pipe jacking construction technology has been widely used. Long-distance large-diameter pipe jacking, Small-caliber miniature jacking pipes and curved jacking pipes have also made considerable progress, becoming the pride of the pipe jacking family. The supporting equipment for pipe jacking includes main jacking equipment, foundation pit guide rails, top iron and grouting equipment, backrest, lifting equipment, etc. The pipe jacking machine is abbreviated as the pipe jacking machine, which is placed on the guide rail, at the forefront of the pipe jacked. Its main function is to take soil and ensure the correctness of the pipe jacking direction. In order to ensure the smooth jacking of the pipe, the form of the pipe jacking machine must be determined according to the soil condition on the jacking line. The main roof equipment is also installed on the base of the work pit, and the direction of the front roof is the same as the line direction of the pipeline. The pipes are placed between the pipe jacking machine and the main roof equipment. The main roof equipment depends on the backrest to push the reaction force evenly. The role of the working pit on the shaft wall. Top iron is an indispensable equipment for jacking operations, which can be divided into ring type and U-shaped top iron. It is placed between the jacking pipe and the main jacking equipment to disperse the jacking force and evenly apply the jacking force to the pipe, thereby protecting the pipe and extending the force of the main jacking equipment. The lifting equipment is erected above the work pit. The purpose is to transport the jacking pipes to the work pit. The use of grouting equipment is an important part of pipe jacking construction. During the jacking process, grouting the pipe with grouting holes is used to form an annular mud jacket on the peripheral wall of the pipe. Thereby, the jacking resistance is reduced, which not only protects the pipe material but also makes it possible to push the pipe with a long distance and large diameter. In addition, soil conveying devices, measurement systems, ventilation and lighting facilities in the tunnel are also links that cannot be ignored in the construction. Due to the particularity of pipe jacking construction, some requirements for pipe jacking construction are also different from those for open-cut construction pipes. Such as the self-sealing requirements of the pipe joints during the jacking process, the 28-day compressive strength of the reinforced concrete pipe is not less than 40Mp, etc.