RAPID CONSTRUCTION METHOD OF PIPE JACKING FOR UNDERGROUND RESCUE TUNNEL WITH LARGE SECTION

Abstract

A rapid construction method of pipe jacking for underground rescue tunnel with large section is disclosed. The present invention realizes rock breaking through the cutting head of a roadheader cutting unit, and pushes pipe jacking forward through a pushing thruster. During the process, a protecting bush fixedly connected with a stretchable part is adopted for circumferential support; and since the cutting head and the protecting bush occupy the rock breaking space, and the pushing thruster pushes pipe jacking forward to push the coal rock in the annular space to the circumferential direction, the effect of moving forward without slag discharge can be achieved. The present invention can establish a rescue tunnel quickly and effectively, which saves rescue time and greatly reduces the threat to the life safety of trapped people. The present invention can establish a fast and safe underground rescue tunnel with large section for the rescue of people.

Claims

1. A rapid construction method of pipe jacking for underground rescue tunnel with large section, wherein the method is realized based on a downhole rescue device with large section, and the rescue device comprises a roadheader cutting unit (1), a pipe-jacking (9) and a pushing thruster; the roadheader cutting unit (1) comprises a cutting head (1-1), a protecting bush (1-2), a stretchable part (1-3), a cutting reducer (1-4), an electric motor (1-5), a frame body (1-6) and couplings (1-7); the frame body (1-6) is fixed on the tail end of the roadheader cutting unit (1), and the electric motor (1-5) is fixed in the frame body (1-6) and used to provide power; an input shaft of the cutting reducer (1-4) is connected with the electric motor (1-5) through the coupling (1-7), and an output shaft is connected with one end of the stretchable part (1-3) through the coupling (1-7); the cutting head (1-1) is fixed on the other end of the stretchable part (1-3) to realize the stretch and pitch of the cutting head (1-1); the cutting head (1-1) has a tapered structure; the protecting bush (1-2) is fixed on the periphery of the stretchable part (1-3) to realize circumferential support; the pipe jacking (9) has a circular tube structure, the diameter of the top end part thereof is reduced to form a cone, and the top end of the pipe-jacking (9) is sheathed on the periphery of the protecting bush (1-2); the pushing thruster comprises a relay chamber (2), top iron (3), a main oil cylinder (4), a counter-force apparatus (5), a main top cylinder frame (6), a leveling device (7) and a framework (8); the relay chamber (2) has a ring structure, and is located in the middle of the pipe jacking (9) and used to increase thrust; the top iron (3) has an annular structure and has the same inner and outer diameters as the pipe-jacking (9), one end of the top iron (3) is connected with the tail end of the pipe-jacking (9), and the other end is connected with the main oil cylinder (4) to transfer the thrust to the pipe-jacking (9) and uniformly distribute the thrust on the section of the pipe jacking (9); the main oil cylinder (4) is fixed on the main top cylinder frame (6) and used to provide thrust; the main top cylinder frame (6) is fixed on the counter-force apparatus (5) which provides counterforce for the advancement of the pushing thruster; both ends of the framework (8) are respectively connected with the top iron (3) and the counter-force apparatus (5) for supporting the pushing thruster; the leveling device (7) is placed on the ground and connected with the framework (8); the rapid construction method of pipe jacking comprises the following steps: step 1: setting up a downhole rescue device with large section, wherein the initial status is that the cutting head (1-1) retracts to 10%-20% of the stroke thereof and the cutting head (1-1) does not rotate; step 2: when retracting to the shortest stroke, the cutting head (1-1) begins rotating and realizes rock breaking during rotation; step 3: the cutting head (1-1) conducts continuous rotation for rock breaking and advancement; with the continuous extension of the cutting head (1-1), the space behind the section of the cutting head (1-1) is circumferentially supported by the protecting bush (1-2) to withstand the broken gravel in the tunnel; and when extending to the longest stroke, the cutting head (1-1) stops rotating; step 4: after the cutting head (1-1) stops rotating, the pushing thruster pushes the pipe jacking (9) forward to push the coal rock in the annular space to the circumferential direction; then the cutting head (1-1) of the roadheader cutting unit retracts to provide more slag discharge space and reduce the axial force required for pushing the pipe-jacking; and the pushing thruster continues pushing the pipe jacking (9) forward, and stops pushing until the cutting head (1-1) retracts to 70%-80% of the stroke thereof; step 5: the cutting head (1-1) of the roadheader cutting unit retracts to the initial status; step 6: repeating step 1 to step 5 to realize rescue operation.

Description

DESCRIPTION OF DRAWINGS

[0017] FIG. 1 is a structural schematic diagram of a roadheader cutting unit of the present invention;

[0018] FIG. 2 is a schematic diagram of a cutting head stopping working in a rescue tunnel;

[0019] FIG. 3 is a longitudinal schematic diagram of FIG. 2;

[0020] FIG. 4 is a schematic diagram of a longitudinal working section in a rescue channel;

[0021] In the figures: 1 cutting unit; 1-1. cutting head; 1-2. protecting bush; 1-3. stretchable part; 1-4. cutting reducer; 1-5. electric motor; 1-6. frame body; 1-7. coupling; 2. relay chamber; 3. top iron; 4. main oil cylinder; 5. counter-force apparatus; 6. main top cylinder frame; 7. leveling device; 8. framework; and 9. pipe-jacking.

DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further described in combination with the drawings but not limited to this. Any modification or equivalent replacement of the technical solution of the present invention without departing from the purpose and the scope of the technical solution of the present invention shall be covered within the protection scope of the present invention.

[0023] As shown in FIG. 1 and FIG. 4, the downhole rescue device with large section comprises a roadheader cutting unit 1, a pushing thruster and a pipe jacking 9.

[0024] The roadheader cutting unit 1 comprises a cutting head 1-1, a protecting bush 1-2, a stretchable part 1-3, a cutting reducer 1-4, an electric motor 1-5, a frame body 1-6 and couplings 1-7. The cutting head 1-1 has a tapered structure, and the cutting head 1-1 is fixed on the front end of the stretchable part 1-3 and used for rock breaking; the protecting bush 1-2 is fixed on the periphery of the stretchable part 1-3 to realize circumferential support; the stretchable part 1-3 is located between the cutting head 1-1 and the cutting reducer 1-4 for stretch and pitch; an input shaft of the cutting reducer 1-4 is connected with the electric motor 1-5 through the coupling 1-7, and an output shaft transfers the torque to the stretchable part 1-3 through the coupling 1-7; the electric motor 1-5 is used to provide power; the frame body 1-6 is arranged on the rear end of the electric motor 1-5 and used for fixing the electric motor 1-5; two couplings 1-7 are provided to firmly connect the cutting reducer 1-4 with the stretchable part 1-3 and the cutting reducer 1-4 with the electric motor 1-5 and to transfer motion and torque; and with the continuous advancement of the roadheader cutting unit 1, the cutting head 1-1 continually breaks the rock.

[0025] The pipe jacking 9 has a circular tube structure, the diameter of the top end part thereof is reduced to form a cone, and the top end of the pipe jacking 9 is sheathed on the periphery of the protecting bush 1-2.

[0026] The pushing thruster comprises a relay chamber 2, top iron 3, a main oil cylinder 4, a counter-force apparatus 5, a main top cylinder frame 6, a leveling device 7 and a framework 8. The relay chamber 2 is a ring made of steel, and is located in the pipe jacking 9 and used to increase thrust; The top iron 3 has an annular structure and has the same inner and outer diameters as the pipe-jacking 9, one end of the top iron 3 is connected to the tail end of the pipe-jacking 9, and the other end of the top iron 3 is connected with the main oil cylinder 4 to transfer the thrust to the pipe-jacking 9 and uniformly distribute the thrust on the section of the pipe-jacking 9; the main oil cylinder 4 is fixed on the main top cylinder frame 6 and used to provide thrust; the counter-force apparatus 5 is fixed on the main top cylinder frame 6 to provide sufficient counterforce for advancement; the framework 8 is used to support the pushing thruster, the front end thereof is connected with the top iron 3, and the tail end is connected with the counter-force apparatus 5; and the leveling device 7 is placed on the ground and connected with the framework 8 for field leveling.

[0027] A rapid construction method of pipe jacking for underground rescue tunnel with large section is mainly realized by breaking the rock by the roadheader cutting unit and pushing the pipe jacking forward by the pushing thruster. In this process, the protecting bush 1-2 fixedly connected with the stretchable part 1-3 is adopted for circumferential support; the cutting head 1-1 and the protecting bush 1-2 occupy the rock breaking space; and the pushing thruster pushes the pipe jacking 9 forward to push the coal rock in the annular space to the circumferential direction so as to achieve the effect of moving forward without slag discharge. The method comprises the following specific steps:

[0028] Step 1: after a rapid construction device of pipe jacking for underground rescue tunnel with large section is set up, the initial status is that the cutting head 1-1 of the roadheader cutting unit retracts to 10%-20% of the stroke thereof and the cutting head 1-1 does not rotate.

[0029] Step 2: to reduce the starting torque of the cutting head, the cutting head 1-1 retracts to the shortest stroke, then begins rotating and realizes rock breaking during rotation.

[0030] Step 3: the cutting head 1-1 conducts continuous rotation for rock breaking and advancement; with the continuous extension of the cutting head 1-1, the space behind the section of the cutting head 1-1 needs support, and the protecting bush 1-2 is adopted for circumferential support (as shown in FIG. 1) to withstand the broken gravel in the tunnel; and when extending to the longest stroke, the cutting head 1-1 stops rotating.

[0031] Step 4: the pushing thruster pushes the pipe jacking 9 forward, and the cutting head 1-1 of the roadheader cutting unit retracts; and the pushing thruster continues pushing the pipe jacking 9 forward, and stops pushing until the cutting head 1-1 retracts to 70%-80% of the stroke thereof. As shown in FIG. 2 and FIG. 3, after the cutting head 1-1 stops rotating, because rock breaking is completed with the range 1044 shown in FIG. 2 and FIG. 3, the space is occupied by the cutting head 1-1 and the protecting bush 1-2, the pushing thruster pushes the pipe jacking 9 forward to push the coal rock in the annular space between 1500 and 1044 in FIG. 2 and FIG. 3 to the circumferential direction, and the pipe jacking 9 moves forward to the preset position to form a part of the rescue tunnel. In addition, the cutting head 1-1 can also retract moderately to provide more slag discharge space and reduce the axial force required for pushing the pipe-jacking.

[0032] Step 5: after the pushing work is stopped, the cutting head 1-1 retracts to the initial status.

[0033] Step 6: repeating step 1 to step 5 to realize rescue operation.