Deep hole blasting pretreatment construction method for high-strength spherical weathering body in shield section

Abstract

The invention discloses a shield section high-strength spherical weathering body deep hole blasting pretreatment construction method which adopts deep hole weak loosening blasting and comprises the following steps: 1) defining a plane range of a spherical weathering body, and determining a to-be-treated depth range of the spherical weathering body; (2) blast holes are formed; 3) selecting explosive unit consumption; (4) a charging structure is selected for cartridge bag processing; (5) putting the medicine bag in place and fixing; (6) a detonating network is arranged, the two non-electric detonators of each cartridge bag are connected to a parallel loop of the ground cluster-connected detonators, the two ground cluster-connected detonators are connected with the detonating detonators, and the whole detonating network is formed; (7) the blast hole is blocked, the hole opening is covered with a sandbag, then an overhead protection support is arranged in the blast area, and a saddle weight is arranged on the overhead protection support; 8) drilling to verify the blasting effect; and (9) grouting reinforcement is conducted on the blasting area, and soil disturbed by blasting is fixedly connected into a whole. The invention can ensure that the shield tunneling machine can drive and pass safely, and can accelerate the construction progress.

Description

technical field [0001] The invention relates to a construction method of urban rail, in particular to a construction method for pretreatment of high-strength spherical weathered body deep hole blasting in a shield section. Background technique [0002] With the development of economy and society, the urban population is increasing and the traffic is becoming more and more congested. The development of underground space has become an effective way to solve urban problems, and the construction of underground rail transit is one of the effective means. Shield method construction has become one of the main methods of underground rail transit construction due to its advantages of high degree of automation, fast construction speed, and less impact on the ground environment. However, as more and more cities build subways, the underground space is gradually becoming tighter, and there are fewer and fewer sites suitable for subway construction. In the central area of ​​the city, vari...

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Problems solved by technology

However, as more and more cities build subways, the underground space is gradually becoming tighter, and there are fewer and fewer sites suitable for subway construction. In the central area of ​​the city, various pipelines and buildings are densely distributed, and the surrounding environment is complex, requiring high construction. Difficulty; outside the city center, often faced with some complex geological conditions, such as high-strength spherical weathered body in the shield section, high-strength spherical weathered body group area of ​​high-strength spherical weathered body lithology uniaxial saturated compression The strength is high, and the diameters of boulders vary. If the direct propulsion method is used, the cutter head may be severely worn, and the number of openings will be increased. At the same time, the risk of ground subsidence will increase, making it difficult to carry out construction operations.

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