Construction method for connection passage by double-row hole horizontal freezing method

Abstract

The invention relates to a construction method of a connecting channel by a double-row hole horizontal freezing method. The method comprises the following steps: freezing parameters are defined; frozen holes are arranged and drilled; a freezing system is mounted and operated; the connecting channel is constructed and excavated; injected slurry is unfrozen and thawed initiatively, artificially and compulsively combining construction monitoring and natural unfreezing; in the method, at the time of natural unfreezing, hot brine circulates in the frozen holes, frozen soil is unfrozen compulsively in means of area separation, and the unfreezing is carried out from down to up; thaw settlement grouting is carried out by a pre-buried injection pipe, and the grouting is carried out from down to up; the frozen holes are arranged in a row of outer holes and a row of inner holes; the length of the holes is subject to the length reaching a side duct piece, the way of holing on the two sides is applied; the connecting channel is excavated in the way of dynamic excavation, namely the heading and constructing of two main tunnels are operated simultaneously. The method efficiently controls the stability of the mouth of a cave in the process of excavation and the sedimentation of the connecting channel and the two main tunnels, and has the advantage of saving the construction period, therefore, the method is applicable for the freezing construction of the connecting channel of various soft soil layers.

Description

Technical field: [0001] The invention relates to a freezing method construction method for an underground tunnel and its connecting passage, in particular to a construction method for a double-row hole horizontal freezing method connecting passage, which belongs to the technical field of construction engineering. Background technique: [0002] The freezing method construction is to use artificial refrigeration technology to freeze the water in the formation, turn the natural soil into frozen soil, thereby increasing its strength and stability, and isolating the connection between groundwater and underground structures, so that the development can be carried out under the protection of the freezing curtain. A special construction method of excavation construction. In the 1860s, the freezing method was first applied to building foundation engineering in South Wales, England. In 1883, P.H.Potsch, a German engineer, successfully constructed a 103m-deep shaft in the coal mine of...

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Problems solved by technology

The article "Construction Technology of the Freezing Method for the Connecting Channel of the Double-layer Cross-river Tunnel" mainly expounds the construction of the connecting tunnel by the horizontal freezing method in the double-layer cross-river tunnel of Fuxing East Road. , long inclined holes and tunnel through-holes on the north-south line, the drilling precision is high, the construction is difficult, and some construction technologies lack sufficient experience

[0004] Although the above-mentioned freezing construction method is widely used in various tunnel constructions passing through unstable alluvium and fractured aquifers at present, it has the following deficiencies: (1) the freezing holes adopt a single row of holes or a double row of long and short holes. The efficiency is low and the time is long when the volume is frozen; (2) the construction of the connecting passage is carried out after the completion of the main tunnel construction in the above freezing scheme, so the construction period is long; (3) the frozen curtain after the structure is generally thawed naturally, so it cannot be effectively controlled Settlement of tunnels and connecting channels

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