Ultra-shallow overburden shield tunneling entry and exit combined with pipeline planar π-type natural stress compensation method

Abstract

This invention discloses a planar π-type natural stress compensation method for ultra-shallow overburden shield tunneling combined with pipeline, comprising the following steps: 1. Constructing the launching or receiving shaft of the ultra-shallow overburden shield and the corresponding material channel; constructing the main structure of the launching or receiving shaft except for the roof slab and internal structure; 2. Hoisting and assembling the shield machine, transporting and installing the shield machine and its accessories through the material transport channel, and transporting materials, personnel, and machinery and equipment by transport vehicles; 3. Shield tunneling construction; 4. After the shield tunnel is completed, installing the pipeline inside the tunnel; 5. Constructing the remaining structure of the launching or receiving shaft, including the roof slab, and dismantling the material channel; constructing the buried pipeline, which adopts a planar π-type natural compensation layout and uses deep overburden to offset the remaining stress. This invention solves the problems of high pipeline stress, high anchorage stress, low vertical transportation efficiency, long construction period, high construction risk, and high cost in the prior art.

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