Tunnel foot locking steel pipe having freezing function and partial freezing construction method

A technology of locking feet and steel pipes, which is applied in tunnels, earth-moving drilling, mining equipment, etc., can solve problems such as poor performance, ineffective foot-locking steel pipes, and difficulty in suppressing the substantial settlement of tunnels, so as to enhance flexibility and shorten freezing. effect of time

CN111188621APending Publication Date: 2020-05-22CENT SOUTH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-05-22

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Abstract

The invention discloses a tunnel foot locking steel pipe having a freezing function and a partial freezing construction method. The tunnel foot locking steel pipe having the freezing function comprises a common foot locking steel pipe and a freezing cavity arranged in the common foot locking steel pipe, and the freezing cavity is connected with a refrigerant circulating system. The partial freezing construction method comprises the steps that a tunnel is excavated in water-rich soft surrounding rock through a benching tunneling method, after upper benching and preliminary supporting, the tunnel foot locking steel pipe is driven from an arch foot supported in the upper benching preliminary stage, the tunnel foot locking steel pipe is connected with the refrigerant circulating system so thatthe surrounding rod around the foot locking steel pipe is partially frozen, then, lower benching is conducted, lower step preliminary supporting is conducted, cyclic construction is conducted in sequence till the whole tunnel is sealed and cyclic, and freezing is stopped. According to the tunnel foot locking steel pipe having the freezing function and the partial freezing construction method, materials are saved, the freezing pipe material consumption and construction cost are reduced, the surrounding rock is partially frozen through the foot locking steel pipe, thus, the surrounding rock freezing range is greatly reduced, the bearing capacity of the foot locking steel pipe is effectively improved, and the construction economical efficiency and flexibility are improved.
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Description

technical field

[0001] The invention relates to the field of tunnels and underground engineering, in particular to a tunnel locking foot steel pipe with a freezing function and a local freezing construction method. Background technique

[0002] Locking foot steel pipe is an important method for controlling the settlement of the primary support structure of the tunnel. Locking foot steel pipes are usually seamless steel pipes with a diameter of 42mm to 108mm. The outer end is welded to the I-beam for primary support, and the inner end is inserted into the rock and soil mass. When the initial support I-beam settles downward, the outer end of the steel pipe inserted into the rock and soil mass also moves downward synchronously, causing the steel pipe to bend to provide upward supporting force. The size of the supporting force of the locking foot steel pipe depends not only on the parameters and deformation of the steel pipe, but also on the properties of the rock and soil mass...

Examples

Embodiment Construction

[0024] In order to better understand the present invention, the invention will be described in further detail below in conjunction with the accompanying drawings and implementation examples, but the embodiments of the present invention are not limited thereto, and the scope of protection of the present invention also relates to those skilled in the art who can achieve according to the concept of the present invention. Think of the equivalent technical means.

[0025] see figure 1 , a tunnel foot-locking steel pipe 1 with freezing function, comprising a common foot-locking steel pipe 11 and a freezing chamber 12 arranged in the inner cavity of the common foot-locking steel pipe 11 . The wall of the freezing chamber 12 is made of steel or polymer heat-conducting material, and its outer diameter matches the inner diameter of the ordinary lock-leg steel pipe 11, and the outer wall of the freezing chamber 12 is closely attached to the inner wall of the ordinary lock-leg steel pipe ...