Construction method for pneumatic tamping pipe of horizontal frozen hole on metro bypass

Abstract

The invention relates to a construction method for a pneumatic tamping pipe of a horizontal frozen hole on a metro bypass, which comprises the following steps: mounting an orifice water sealing device, building a pipe-rammer frame and installing guide rails, preparing for ramming, constructing the pneumatic tamping pipe, sealing and grouting. When the construction is carried out in tunnels, connecting passages and shield entering and leaving tunnels, because the stratum located by the pneumatic tamping pipe is sandy soil, mucky clay, silt, and the like, which is soft, great water-containing and huge pressure-bearing stratum, the application of the method can guarantee less mud from a construction frozen hole, small disturbance to the stratum and construction safety and low cost. The equipment used by the invention is low in cost; the frozen pipes are simple to manufacture without utilizing large-size drill, and have high connection strength, security and reliability, energy saving andenvironmental protection.

Description

technical field [0001] The invention relates to a construction method for pneumatically ramming a horizontal freezing hole of a subway side passage, and belongs to the technical field of formation freezing construction. Background technique [0002] Since the beginning of the 21st century, more and more cities around the world have carried out a large number of subway construction projects. During the construction of subway tunnels, when the subway tunnels are located in soft and water-bearing strata or due to urban space restrictions, traditional ground construction methods When it is difficult to carry out, the horizontal freezing method has been widely used in the construction of subway side passages because of its special advantages such as safe and reliable technology, no floor occupation, and the advantages of not polluting the environment; the key process of horizontal freezing method construction is the laying of frozen pipes Construction, in the prior art, the layin...

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Problems solved by technology

[0002] Since the beginning of the 21st century, more and more cities around the world have carried out a large number of subway construction projects. During the construction of subway tunnels, when the subway tunnels are located in soft and water-bearing strata or due to urban space restrictions, traditional ground construction methods When it is difficult to carry out, the horizontal freezing method has been widely used in the construction of subway side passages because of its special advantages such as safe and reliable technology, no floor occupation, and the advantages of not polluting the environment; the key process of horizontal freezing method construction is the laying of frozen pipes Construction, in the prior art, the laying of the frozen pipe generally adopts the drilling method and the pipe drilling construction, that is, the horizontal drilling machine is used to add mud circulation to follow the pipe to drill and lay the frozen pipe. The drill bit is a backstop drill bit, and the drill pipe is the frozen pipe. However, due to the mud circulation, it is necessary to replace part of the soil in the formation before the frozen pipe can enter. When the formation is soft, has a large water content and contains confined water, there will be too much water and sand in the drilling method, which will significantly disturb the formation. And the surface settlement value is large, the safety of the project is poor, and it is easy to cause engineering accidents

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