Small tube shed pre-grouting method

Abstract

The invention relates to an advanced grouting method of a small pipe roofing, comprising the following steps of: slope protection processing; inserting a double guide pipe; closing the working surface of a side slope; grouting to adit section through the double guide pipe; preserving core soil for driving by a short step method; mounting an arch part bracket, mounting a single row pipe roofing pipe on the arch part bracket, welding and hanging a metal mesh on the arch part bracket and mesh-spurting concrete so as to form an arch part support; grouting to a driving section through the single row pipe roofing pipe; continuing to excavate a lower step, mounting bracket legs of the arch part bracket and mesh-spurting the concrete so as to form a wall part support; and adopting the concrete to carry out permanent masonry for the excavated laneway, adopting the method to continue digging at the front and masonry at the back until the engineering of the driving section is completed. The method carries out advanced grouting through the small guide pipe and increases the adhesion of a loose layer; an outer support formed by a metal mesh-spurting concrete and the pipe roofing ensures the stability and the safety of the excavated laneway before the permanent support is carried out; the cost of the engineering is low; the construction speed is fast; the safe effect is good; and the construction quality can be ensured.

Description

technical field [0001] The invention relates to a roadway and tunnel construction method, in particular to a construction method for advance grouting of a small pipe shed for the construction of a mine roadway and tunnel in a particularly loose stratum such as deep and thick eolian sand overlying a long distance. Background technique [0002] Usually, in various mine construction projects that use adit and inclined shaft development, as well as tunnel projects such as railways and highways, the roadway may be located in a small amount of loose stratum, and the thickness of the aeolian sand covered on the loose stratum is small. shorter. In this kind of roadway with a small amount of loose ground, the method of open trench excavation is generally used for construction, and the construction method is relatively mature and the construction effect is good. [0003] However, in the overlying long-distance deep aeolian sand and other particularly loose strata, the excavation meth...

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Problems solved by technology

[0003] However, in the overlying long-distance deep aeolian sand and other particularly loose strata, the excavation method of open trench is used for construction, the excavation volume is too large, a large area of ​​land is required, and the working hours are often delayed. At the same time, sand layer flow, Caving and other engineering disasters

However, other construction methods such as shield tunneling method, freezing method, rotary spray pile method, and large pipe shed not only require a professional construction team, but also have complicated processes, high construction costs, and construction effects cannot be guaranteed.

[0004] Therefore, there is still a lack of mature construction methods for roadway construction in especially loose formations such as deep and thick eolian sand overlying long distances, which is a major problem in the construction of inclined shafts.

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