A method for deformation control of large-span tunnel in chlorite schist stratum. The method divides the large deformation of large-span tunnel in chlorite schist stratum into five deformation grades according to the surrounding rock conditions of the tunnel. In response to each deformation grade, the deformation control of large-span tunnel is determined so as to ensure the safety and stability of the tunnel support structure and to avoid the clearance intrusion caused by tunnel deformation.

A method for deformation control of large-span tunnel in chlorite schist stratum. The method divides the large deformation of large-span tunnel in chlorite schist stratum into five deformation grades according to the surrounding rock conditions of the tunnel. In response to each deformation grade, the deformation control of large-span tunnel is determined so as to ensure the safety and stability of the tunnel support structure and to avoid the clearance intrusion caused by tunnel deformation.

The purpose of the present invention is to provide an artificial ground freezing method having good coolant thermal efficiency without a gas-phase coolant being released into the ground or into the air. For that purpose, the present invention has: a freeze pipe (1: casing) for freezing the ground buried in the ground and a coolant circulation pipe (2) provided on the inside of the freeze pipe (1), wherein the coolant flowing inside the coolant circulation pipe (2) is carbon dioxide; and a coolant apparatus (10) that cools and supplies the carbon dioxide to the coolant circulation pipe (2), the coolant circulation pipe (2) comprising a first coolant circulation pipe (2A) on which a plurality of micro-coolant passages (2A delta) is formed, wherein the tip portion (tip portion in the ground) of the first coolant circulation pipe (2A) is connected to a plugging member (3: bottom socket) that connects the plurality of micro-coolant passages (2A delta) of the first coolant circulation pipe (2A) to a coolant supply side and coolant return side.

The purpose of the present invention is to provide an artificial ground freezing method having good coolant thermal efficiency without a gas-phase coolant being released into the ground or into the air. For that purpose, the present invention has: a freeze pipe (1: casing) for freezing the ground buried in the ground and a coolant circulation pipe (2) provided on the inside of the freeze pipe (1), wherein the coolant flowing inside the coolant circulation pipe (2) is carbon dioxide; and a coolant apparatus (10) that cools and supplies the carbon dioxide to the coolant circulation pipe (2), the coolant circulation pipe (2) comprising a first coolant circulation pipe (2A) on which a plurality of micro-coolant passages (2A delta) is formed, wherein the tip portion (tip portion in the ground) of the first coolant circulation pipe (2A) is connected to a plugging member (3: bottom socket) that connects the plurality of micro-coolant passages (2A delta) of the first coolant circulation pipe (2A) to a coolant supply side and coolant return side.

A squeezing device for an underground project, comprising a guide body, a vibration system, a lubricating system, a guide system, a cutting mechanism and a gate, wherein the vibration system is located on four walls of the guide body, the lubricating system is internally provided with a lubricating pipeline along the four walls of the guide body and communicates with a corresponding lubricating nozzle, the guide system is located on four walls at a front end of the guide body, and the cutting mechanism is located at a front end of an inner cavity of the guide body, and the gate is located in a functional bin.

A squeezing device for an underground project, comprising a guide body, a vibration system, a lubricating system, a guide system, a cutting mechanism and a gate, wherein the vibration system is located on four walls of the guide body, the lubricating system is internally provided with a lubricating pipeline along the four walls of the guide body and communicates with a corresponding lubricating nozzle, the guide system is located on four walls at a front end of the guide body, and the cutting mechanism is located at a front end of an inner cavity of the guide body, and the gate is located in a functional bin.

The invention relates to a tunnel boring device for creating a bore from a starting point to a target point in the ground, along a predefined boring line by advancing the tunnel boring device in order to create a tunnel or for laying a pipeline in the ground using a boring tool to break up the ground; having at least one feed line for supplying a boring fluid to the boring tool; having at least one section, arranged at the rear of the boring tool, for receiving the ground which has been broken up and is present in the form of cuttings, wherein the region of the boring tool and the at least one section are essentially filled with boring fluid, and the boring fluid is provided in the region of the boring tool and within the at least one section with a pressure that essentially corresponds to the pressure in the ground at the heading face; having at least one pump for removing, from the section, the boring fluid mixed with the cuttings; having at least one conveying line for removing, from the bore, the boring fluid mixed with cuttings, this line being connected to the delivery side of the at least one pump, and wherein the at least one pump is connected to the at least one section via at least one suction line. In that context, it is provided that the pump is a jet pump which is connected to a drive line via which a driving fluid is supplied to the jet pump; that the at least one pump is arranged outside the at least one section; and that the at least one suction line contains at least one shutoff valve with which the suction line can be shut off.

A method of forming tunnels(6), and tunnels formed thereby, said tunnels in one embodiment being of a form to carry transport routes (1) such as rail and road transport therealong. The method allows the tunnel to be formed from one or more access points (2) by allowing the tunnel structure (6) to be progressively extended out from the tunnel by advancing deck structures (24) along guide means (20) which are formed as part of a base structure (18). The deck structures (24) can also be used to support excavation equipment (28) and/or act as transport routes for access to the leading edge of the tunnel as it is formed. This greatly reduces the need for separate access and works to be provided adjacent to the tunnel as it is formed and therefore reduces the level of reinstatement works required after the tunnel has been formed.

A method of forming tunnels(6), and tunnels formed thereby, said tunnels in one embodiment being of a form to carry transport routes (1) such as rail and road transport therealong. The method allows the tunnel to be formed from one or more access points (2) by allowing the tunnel structure (6) to be progressively extended out from the tunnel by advancing deck structures (24) along guide means (20) which are formed as part of a base structure (18). The deck structures (24) can also be used to support excavation equipment (28) and/or act as transport routes for access to the leading edge of the tunnel as it is formed. This greatly reduces the need for separate access and works to be provided adjacent to the tunnel as it is formed and therefore reduces the level of reinstatement works required after the tunnel has been formed.