Lining with pipe jacking
Pipe jacking process: installation and coating
The Reinforced concrete pipe driving is made with prefabricated cylindrical elements that form the tunnel lining. These tubes are installed and driven from the shaft, transferring the thrust to the tunnel boring machine located at the front. To reduce the friction between the pipe and the ground during the pipe laying phase. pipe rammingBentonite or polymers are injected into the bottom. In long sections, intermediate thrust stations are placed to ensure a constant and efficient advance. The advance is controlled by a set of thrust cylinders installed in the jacking well above the jacking pipe, designed to withstand high longitudinal and transverse stresses without deterioration.
Pipe types and pipe driving techniques
In the process of microtunneling or closed shield techniquevarious types of concrete pipe jacking. The most common include the reinforced concrete pipe for drivingThe pipes are made of steel pipe, polycrete or polyester resin pipe, and ceramic or stoneware pipe. Each type of pipe has a gasket installed in the nozzle to guarantee watertightness and a "dolly" in the tail that absorbs irregularities and allows an efficient joint between pipes. In addition, attack shafts are built with a reaction wall to withstand the thrust pressures and arrival shafts to rescue the machine. For long pile driving, the intermediate stations distribute the stresses among several sections, optimizing the PIPE-JACKING/MICROTUNNELING.
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Frequently asked questions about pipe ramming lining
What is pipe ramming and how is it performed?
The pipe ramming is a process in which prefabricated cylindrical pipes are installed in a subway tunnel. It is carried out by pushing the pipes from an attack shaft, using thrust cylinders that transfer the stress to the tunnel boring machine located at the face. During installation, bentonite or polymers can be injected to reduce friction and facilitate advancement.
What are the types of pipes used in ramming?
In the pipe rammingDepending on the project and soil conditions, various types of pipes are used. The most common include the reinforced concrete pipeThe most common types of pipes are the steel pipe, the polycrete or polyester resin pipe, and the ceramic or stoneware pipe. Each type of pipe is selected according to its characteristics and the required resistance.
What role do intermediate stations play in pipe ramming?
The intermediate stations in the pipe ramming are installed in long lengths to distribute the thrust stresses over several pipe segments. These stations help maintain process stability and reduce the risk of pipe deformation or failure, especially in long projects.
How is the tightness of the pipes ensured during installation?
Each drive pipe is fitted with a gasket on the nozzle to ensure a tight seal. watertightness. In addition, a "dolly" is incorporated into the pipe tail to absorb irregularities and facilitate a secure joint between the pipes, preventing leaks and ensuring efficient integration with the concrete.
What is the microtunneling or closed shield technique and how is it applied?
The microtunneling or closed shield technique is a method of subway excavation that uses a closed shield tunnel boring machine to perform excavation and lining simultaneously. This technique is ideal for difficult conditions and is used to install pipelines in tunnels with high precision and control.
What safety measures are taken during the pipe driving process?
During the pipe rammingIn addition, several safety measures are implemented, such as constant monitoring of ground conditions and equipment, regular maintenance of machinery, and training of personnel. Support and stabilization systems are also used to prevent problems during installation and ensure a safe working environment.
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