Sectional grouting and self-drilling-type pipe shed advance support method

Abstract

The invention belongs to the field of tunnel construction and underground engineering, and discloses a sectional grouting and self-drilling-type pipe shed advance support method. The sectional grouting and self-drilling-type pipe shed advance support method comprises the steps that according to geological conditions of a tunnel construction area, construction parameters of a pipe shed are measured, and the tunnel surface is reinforced; drilling rig equipment and grouting machine equipment are mounted; a drill bit is mounted at the end of a first-section self-drilling-type drilling rod body andconnected with the drilling rig equipment, the drilling rig equipment is started, drilling is stopped after drilling operation of the first-section self-drilling-type drilling rod body is completed,and the grouting machine equipment conducts grouting on the section; after a previous-section self-drilling-type drilling rod body is grouted, a next-section self-drilling-type drilling rod body is connected, and grouting is conducted after drilling operation is completed; and the step is repeated till the pipe shed design length is reached. A slurry overflowing hole does not need to be formed ina self-drilling-type drilling rod, the strength and stiffness of the rod bodies are improved, the self-drilling-type drilling rod serves as a pipe shed steel pipe after drilling, and the drilling hole-forming problems under the adverse geological conditions are solved; and during advancing, sectional grouting and self-drilling-type pipe shed drilling are combined to improve the grouting effect.

Description

technical field [0001] The invention belongs to the field of tunnel construction and underground engineering, and in particular relates to a segmental grouting self-drilling pipe shed advance support method. Background technique [0002] When the construction of tunnel excavation and underground excavation needs to pass through the weak and broken surrounding rock, in order to prevent excessive deformation of the surrounding rock, instability and landslides, pipe shed support, as a mature construction method, is often used as the preferred construction method. [0003] According to 12.2.18 and 12.2.19 of the "Technical Guidelines for High-speed Railway Tunnel Engineering Construction" Tie Jian Jian [2010] No. 241, the more mature construction methods in the construction of pipe sheds are the pipe introduction method and the follow pipe method. According to 12.2.22 of the guideline: "When drilling into the stratum where it is easy to form a hole, the pilot hole jacking method...

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Problems solved by technology

[0004] Existing problems in the prior art: the traditional construction method lead pipe method is limited by geological conditions, the geological conditions are complicated, and it is not suitable to be used in the state of weak and broken surrounding rocks

At the end of drilling, grouting is only done through the water hole of the drill bit. When the hole depth is large, under the condition of weak and broken surrounding rock, the grouting backflow resistance is large, the grouting is difficult, and the effect is not easy to guarantee

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