Device for preventing backward soil movement in construction by using rectangular jacking pipe and construction method of device

Abstract

The invention belongs to the technical field of underground engineering construction, and particularly relates to a device for preventing backward soil movement in the construction by using a rectangular jacking pipe and a construction method thereof. The backward soil movement phenomenon is effectively prevented that a pipe section of the jacking pipe and a machine head of a jacking pipe tunneling machine can drive soil on the jacking pipe and the heading machine to move forwards due to excessive friction force. The device comprises a plurality of extension devices arranged at the front end or shield tail of a rectangular jacking pipe machine, each extension device comprises a flexible isolation strip, and reserved groove seams are formed in the portion, above the extension devices, of the top of the rectangular jacking pipe machine; a hole door in the jacking direction of the rectangular jacking pipe machine is further provided fixture bodies matched with the flexible isolation strips on the extension devices, and fastening devices are arranged on the side walls in the reserved groove seams and provided with flexible sealing brushes; the rectangular jacking pipe machine is further provided with a grease pump. By means of the device for preventing backward soil movement in the tunnel excavation by using the rectangular jacking pipe and the construction method thereof, the soillayer environment above a jacking pipe tunnel is effectively ensured, and the construction safety of enterprises is improved.

Description

technical field [0001] The invention belongs to the technical field of underground engineering construction; in particular, it relates to a device and a construction method for preventing back soil during rectangular pipe jacking construction. Background technique [0002] With the development of urban underground space construction, the requirements for underground engineering construction technology are getting higher and higher; pipe jacking method, as an underground space excavation construction technology, has been widely used in tunnels, underground pipelines and other projects, rectangular pipe jacking tunnel excavation The method is becoming an important construction technology for urban underground tunnel engineering because of its high section utilization rate and low impact on the surrounding environment. There is mutual friction between the soil bodies, and the frictional contact surface is large. Due to the excessive friction force of the pipe jacking pipe joint...

AI Technical Summary

Problems solved by technology

[0002] With the development of urban underground space construction, the requirements for underground engineering construction technology are getting higher and higher; pipe jacking method, as an underground space excavation construction technology, has been widely used in tunnels, underground pipelines and other projects, rectangular pipe jacking tunnel excavation The method is becoming an important construction technology for urban underground tunnel engineering because of its high cross-section utilization rate and low impact on the surrounding environment. There is mutual friction between the soil bodies, and the frictional contact surface is large. Due to the excessive friction force of the pipe jacking pipe joint and the head of the pipe jacking machine, the soil above it will move forward, resulting in the phenomenon of back soil, resulting in The serious disturbance of the soil layer may even cause uplift or subsidence of the surface soil, which will have a significant impact on the soil environment above the pipe jacking tunnel; at present, preventive measures are often used in the existing technology to inject thixotropic mud around the pipe joint. The method is to reduce the phenomenon of back soil. The method is to add a brim structure at the notch ring of the pipe jacking machine, reserve thixotropic mud holes in the brim structure and at the hinge, and inject thixotropic mud in real time during the pipe jacking process to form thixotropic mud holes. However, although the thixotropic mud sleeve can reduce the friction between the pipe jacking and the upper soil, it is still not enough to eliminate the phenomenon of backing the soil, and the formation and surface damage are still unavoidable; In the existing technology, there is also a pipe shed or grouting reinforcement isolation layer above the pipe jacking tunnel. The isolation layer separates the pipe jacking machine and the pipe jacking joint from the upper soil, but this method requires additional costs. And the pipe shed may intrude into the tunnel section, thus causing construction obstacles

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