Construction method for assisting small-diameter open type TBM tunneling for bad geological hole section pipe shed

Abstract

The invention discloses a construction method for assisting small-diameter open type TBM tunneling for a bad geological hole section pipe shed. The method comprises the following steps: 1) making badgeological hole section construction preparation; 2) reinforcing surrounding rocks as temporary support; 3) expanding and extracting a pipe shed workshop; 4) mounting an anchor rod drilling machine, and performing upper water drainage hole construction on a shield; 5) grouting and solidifying the shield and the upper part of a cutter disc; 6) dismounting the anchor rod drilling machine, and mounting a pipe shed drilling machine; 7) performing open hole drilling and grouting; 8) performing pipe shed drilling and grouting; 9) backfilling an expanding and extracting section; and 10) performing TBM tunneling. The construction method can effectively improve strength of surrounding rocks in front of a TBM cutter disc, strengthens surrounding rock self-stabilizing ability, effectively controls height and the range of a collapse cavity above the shield after open type TBM tunneling, achieves less arch-top slagging, greatly reduces slag clearing workload under bad geological conditions, and realizes that TBM continuously and quickly passes through bad geology.

Description

technical field [0001] The invention relates to a construction method for open TBM excavation, in particular to a construction method for small-diameter open TBM excavation assisted by a pipe shed in an unfavorable geological cave section. Background technique [0002] At present, after more than 60 years of development and improvement of the tunnel boring machine (TBM), the manufacturer of the tunnel boring machine has cooperated with the construction unit to develop a variety of models to adapt to different geological conditions, and to continuously optimize the concept of continuous, balanced and rapid construction. Improve. The traditional TBM method construction is mainly applied to rock formations with certain self-stabilization ability; while the traditional pipe shed support method construction is mainly applied to unsteady rock and soil layers or rock formations with broken zones, alteration zones, fault zones, water gushing and mud gushing, etc. Due to the complex...

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Problems solved by technology

[0003] However, when the open TBM encounters unfavorable geological sections such as alteration zones, fault zones, water gushing, mud gushing, rockbursts, and water-rich fracture zones, it is very easy to cause machine jams and large-scale landslides when only relying on open TBM equipment for excavation , A large amount of mud and slag accumulated on the cutter head and the main beam section, etc., seriously affect the construction efficiency

In order to solve the above problems and realize the fast passage and fast support of the open TBM in the unfavorable geological section, the traditional construction uses grouting reinforcement on the face and the surrounding rock around the cutterhead body or pretreatment in advance by opening small pilot holes. This method requires a long construction period, complex procedures, and large drilling angles, resulting in large triangles, poor advance reinforcement effect, and the displacement of the drilling rig is basically assisted by manual and chain hoist chains, resulting in low construction efficiency.

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