A construction method for the pre-protection structure of the underground comprehensive utility gallery of the proposed tunnel with upper span

Abstract

The invention relates to a construction method for the pre-protection structure of the underground comprehensive pipe gallery of the proposed tunnel with the upper span, comprising the following steps: (1) tying the steel cage, (2) construction: first setting the concrete guide wall to locate the enclosing structure of the drilled occlusal pile , then bury the casing, prepare mud, drill holes, clear the holes, lower the reinforcement cage, pour concrete, and then carry out the reinforcement construction of the high-pressure rotary spray column, and then drill holes and plant bars on the enclosure structure of the drilled occlusal piles, and then drill The steel cages of the enclosing structure of the occlusal piles are tied together so that the side walls of the underground comprehensive pipe gallery and the enclosing structure of the bored occlusal piles form a composite wall, which can be jointly stressed, and then the bottom plate, side plate and roof of the underground comprehensive pipe gallery are poured (3) Backfill the soil and restore the road surface, and hand over the project for acceptance. The invention adopts the method of reinforcing the whole building with rotary grouting piles, which can improve the bearing capacity of the foundation and reduce uneven deformation.

Description

technical field [0001] The invention belongs to the field of construction of an underground comprehensive pipe gallery, in particular to a construction method for a pre-protection structure of an underground comprehensive pipe gallery of an upper-span proposed tunnel. Background technique [0002] With the continuous development of the urbanization process, the scarcity of urban land has become more and more obvious, which also makes the development and utilization of underground space become particularly important. More and more underground pipe galleries and shield tunnel projects have been excavated successively, and a large number of adjacent projects such as upper and lower intersections and small clear distance underground pipe galleries and tunnels have emerged. The excavation environment of underground pipe corridors and shield tunnels is relatively complex. During the construction process, they are easily affected by geological conditions and face many problems such...

AI Technical Summary

Problems solved by technology

Proximity excavation near existing tunnels and pipe galleries will once again cause stress redistribution in the soil and support structures around the existing tunnels and pipe galleries. The force has a great influence, and the huge risk greatly increases the difficulty of construction

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