Tunnel reinforced pipe shed segmented installation construction method

Abstract

The application discloses a tunnel reinforced pipe shed segmented installation construction method, adopts a pulling mode to make a steel reinforcement framework segmented and penetrated into a pipe shed steel pipe to install in the same segment, avoids the compression instability deformation of the steel reinforcement framework, adopts welding instead of threaded connection for the steel pipe, avoids the torsional deformation of the steel reinforcement framework, adopts a tool casing to protect the tail part of the pipe shed steel pipe and the exposed steel reinforcement framework from being impacted and extruded and deformed when being pushed into a hole, welds the tool casing on a pushing machine tool to prevent the pushing machine tool from slipping with the tail part of the pipe shed steel pipe, ensures that the force direction is consistent with the axis of the pipe shed steel pipe, and effectively improves the installation construction efficiency and quality of the reinforced pipe shed steel pipe.

Description

Technical Field

[0001] This invention relates to a tunnel construction method, and more particularly to a method for segmented installation of reinforced pipe roofs in tunnels. Background Technology

[0002] To ensure the safety of tunnel excavation and construction, large pipe roofs are widely used. When geological conditions are poor, a reinforcing steel frame is installed inside the steel pipes of the pipe roof to improve its strength. Currently, the common construction method for pipe roofs is to use down-the-hole drilling to drill pilot holes, and then use excavators or loaders to push the pipe roof steel pipes into the holes in sections for installation. The joints of the pipe roof steel pipes are externally threaded, and the internally threaded connecting steel pipes are screwed in for threaded connection. When the pipe roof steel pipes have a reinforcing steel frame inside, the entire reinforcing steel frame is pushed into the pipe roof steel pipe.

[0003] Because the steel reinforcement cage inside the pipe roof is long and has low rigidity, it is difficult to install it into the hole in one go, and it is prone to instability and deformation under the jacking pressure. Summary of the Invention

[0004] The purpose of this invention is to overcome the problems of the prior art and provide a method for segmented installation of reinforced pipe roofs in tunnels that ensures the straightness of the reinforcing steel cage and improves the construction quality and efficiency of pipe roof construction.

[0005] The present invention provides a method for segmented installation of reinforced pipe roofs in tunnels, comprising the following steps:

[0006] S1: Segmented fabrication of steel pipes and reinforcing steel frame for pipe sheds:

[0007] Based on the design length of the tunnel pipe roof and the length of the raw material steel pipes brought to the site, the pipe roof steel pipes are divided into several sections, which are numbered sequentially from the front end to the rear end as the first section, the second section... the nth section, the n+1th section... the mth section; correspondingly, the steel reinforcement skeleton to be installed in each section of the pipe roof steel pipe is divided into m sections, and the section number of the steel reinforcement skeleton is the same as the section number of the pipe roof steel pipe.

[0008] The length of the first section of the steel reinforcement cage is equal to the length of the first section of the pipe shed steel pipe plus the length of the steel reinforcement cage joint section.

[0009] The length of the steel reinforcement cage from the second section to the m-1th section is equal to the length of the corresponding steel pipe section of the pipe shed. When the connection method of the steel reinforcement cage is lap welding, the length of the steel reinforcement cage is increased by the length of the lap section.

[0010] The length of the steel reinforcement cage in section m is equal to the length of the steel pipe in section m of the pipe shed minus the length of the steel reinforcement cage joint section.

[0011] S2: The reinforcing steel frame is inserted into the corresponding segment of the pipe roof steel pipe:

[0012] The steel wire rope is passed through the steel pipe of the pipe roof from the inside and connected to the end of the steel reinforcement cage of the corresponding segment. The steel reinforcement cage is then pulled into the steel pipe of the pipe roof of the corresponding segment.

[0013] The length of the first section of the reinforcing steel cage exposed at the tail of the first section of the pipe roof steel pipe joint.

[0014] The length of the exposed rebar cage joint section at the front end of the corresponding segment of the pipe roof steel pipe in sections 2 to m.

[0015] S3: First section of pipe roof steel pipe jacking hole:

[0016] 301. Prepare a tool sleeve, the tool sleeve including a tube body, with multiple guide rods evenly distributed along the circumference of the outer wall of the tube body, the rear ends of the multiple guide rods being fixedly connected to the outer wall of the front end of the tube body, and the length of the front end of the multiple guide rods extending beyond the front end of the tube body being not less than 4 times the diameter of the tube body, the central axis of the guide rods being parallel to the central axis of the tube body; the length of the tube body is greater than the length of the exposed steel reinforcement skeleton joint.

[0017] 302. Insert the front end of the first section of the pipe roof steel pipe with the first section of the reinforcing steel skeleton installed into the pipe roof pilot hole. Install the tool sleeve at the tail end of the first section of the pipe roof steel pipe. The front end of the pipe body is pressed against the tail end of the first section of the pipe roof steel pipe. The joint section of the reinforcing steel skeleton extends into the inside of the pipe body. The guide rod is close to the outer wall of the first section of the pipe roof steel pipe, so that the axis of the pipe body is consistent with the axis of the first section of the pipe roof steel pipe and the pipe body and the first section of the pipe roof steel pipe are connected as a whole.

[0018] 303. Weld the rear end of the pipe body to the jacking tool, and push most of the first section of the pipe roof steel pipe, which has the first section of the reinforcing steel skeleton installed, into the pipe roof pilot hole, leaving only the tail end of the first section of the pipe roof steel pipe protruding outside the pilot hole. Then remove the tool sleeve.

[0019] S4: Extension of steel pipes and reinforcing steel frame for pipe shed:

[0020] 401. The connecting steel pipe is fitted onto the front end of the next section of the pipe shed steel pipe. The next section of the pipe shed steel pipe and the reinforcing steel skeleton placed inside the next section of the pipe shed steel pipe are aligned with the axis of the previous section of the pipe shed steel pipe. The two sections of reinforcing steel skeleton are welded together.

[0021] 402. Install a pipe clamp at the tail of the previous section of the pipe roof steel pipe and at the front of the next section of the pipe roof steel pipe to clamp the pipe roof steel pipe. Using the two clamps as attachment points, use a chain hoist or jack to pull the two sections of the pipe roof steel pipe together and tighten them. During the process of pulling the pipe roof steel pipe together, the next section of the pipe roof steel pipe moves forward. The length of the rebar cage joint section exposed at the tail of the next section of the pipe roof steel pipe is used for the next rebar cage extension.

[0022] 403, Remove the clamps;

[0023] S5: Pipe roof steel pipe segment jacking insertion hole:

[0024] Install the tool sleeve at the tail of the second section of the pipe roof steel pipe using the method in step 302, and then connect the jacking machine using the method in step 303. Use the jacking machine to push most of the second section of the pipe roof steel pipe into the pipe roof pilot hole, leaving only the tail of the second section of the pipe roof steel pipe exposed outside the pipe roof pilot hole. Then remove the tool sleeve.

[0025] S6: Increase the segment number of the pipe roof steel pipe by 1, and then repeat steps S4 and S5 until the m-th pipe roof steel pipe is pushed into the pipe roof pilot hole. Use the jacking tool to push the tail of the m-th pipe roof steel pipe completely into the pipe roof pilot hole. The tail of the m-th pipe roof steel pipe is flush with the opening of the pipe roof pilot hole. The entire pipe roof steel pipe is now installed.

[0026] S7: Repeat steps S1 to S6 until all pipe roof steel pipes are installed.

[0027] The advantages and positive effects of this invention are as follows: The use of a pulling method to insert the reinforcing steel cage into the pipe roof steel pipe in sections effectively avoids the problem of instability and deformation of the reinforcing steel cage under pressure, improving the installation quality and efficiency; the use of welded joints avoids the problem of torsional deformation of the reinforcing steel cage during the threaded connection of the steel pipe; the use of a tool sleeve protects the tail end of the pipe roof steel pipe and the exposed reinforcing steel cage joints from impact and compression deformation when the steel pipe is pushed into the hole, ensuring the connection quality between the pipe roof steel pipe and the various sections of the reinforcing steel cage inside the steel pipe; welding the tool sleeve to the jacking tool prevents slippage between the jacking tool and the tail end of the pipe roof steel pipe, ensuring that the force direction of the jacking tool is consistent with the axis of the pipe roof steel pipe, thus improving the installation efficiency and quality of the pipe roof steel pipe. Attached Figure Description

[0028] Figure 1 This is a construction schematic diagram of the joint of the steel pipe and reinforcing bar cage of the present invention;

[0029] Figure 2 This is a schematic diagram of the steel pipe structure for the pipe shed of the present invention;

[0030] Figure 3 This is a schematic diagram of the tool sleeve structure of the present invention;

[0031] Figure 4 This is a schematic diagram illustrating the application of the tool sleeve of the present invention. Detailed Implementation

[0032] To further understand the invention's content, features, and effects, the following embodiments are provided, along with accompanying drawings. Figures 1-4 Detailed explanation is as follows:

[0033] The present invention provides a method for segmented installation of reinforced pipe roofs in tunnels, comprising the following steps:

[0034] S1: Segmented fabrication of steel pipes and reinforcing steel frame for pipe sheds:

[0035] Based on the design length of the tunnel pipe roof and the length of the raw material steel pipes brought to the site, the pipe roof steel pipe 1 is divided into several sections, which are numbered sequentially from the front end to the rear end as the first section, the second section... the nth section, the n+1th section... the mth section; correspondingly, the reinforcing steel skeleton 2 to be installed in each section of the pipe roof steel pipe is divided into m sections, and the section numbering of the reinforcing steel skeleton 2 is the same as the section numbering of the pipe roof steel pipe 1;

[0036] The length of the first section of the steel reinforcement cage is equal to the length of the first section of the pipe shed steel pipe plus the length of the steel reinforcement cage joint section.

[0037] The length of the steel reinforcement cage 2 in the second to the m-1th section is equal to the length of the corresponding steel pipe section of the pipe shed. When the connection method of the steel reinforcement cage 2 is lap welding, the length of the steel reinforcement cage 2 is increased by the length of the lap section.

[0038] The length of the m-th section of the reinforcing cage is equal to the length of the m-th section of the pipe roof steel pipe minus the length of the reinforcing cage joint.

[0039] S2: The reinforcing steel frame is inserted into the corresponding segment of the pipe roof steel pipe:

[0040] The steel wire rope is passed through the inside of the pipe roof steel pipe 1 and connected to the end of the corresponding section of the steel reinforcement skeleton 2. The steel reinforcement skeleton 2 is then pulled into the corresponding section of the pipe roof steel pipe 1.

[0041] The length of the exposed steel reinforcement cage 2 at the tail end of the steel pipe 1 in the first section of the pipe shed;

[0042] The length of the exposed steel reinforcement cage joint section at the front end of the corresponding segment of the pipe roof steel pipe 1 in the second to mth sections.

[0043] S3: First section of pipe roof steel pipe jacking hole:

[0044] 301. Prepare a tool sleeve, which includes a tube body 3. The tube body 3 is preferably made of the same steel pipe as the pipe roof steel pipe 1. Multiple guide rods 4 are evenly distributed along the circumference of the outer wall of the tube body 3. The rear ends of the multiple guide rods 4 are fixedly connected to the outer wall of the front end of the tube body 3, and the length of the front ends of the multiple guide rods extending beyond the front end of the tube body 3 is not less than four times the diameter of the tube body 3. The central axis of the guide rods 4 is parallel to the central axis of the tube body 3. The length of the tube body 3 is greater than the length of the exposed steel reinforcement skeleton joint. The guide rods 4 can be made of straight steel sections or steel bars.

[0045] 302, the front end of the first section of the pipe roof steel pipe 1 with the first section of the reinforcing steel skeleton installed is placed into the pipe roof guide hole, and a tool sleeve is installed at the tail end of the first section of the pipe roof steel pipe 1. The front end of the pipe body 3 is pressed against the tail end of the first section of the pipe roof steel pipe 1, the joint section of the reinforcing steel skeleton extends into the inside of the pipe body 3, and the guide rod 4 is close to the outer wall of the first section of the pipe roof steel pipe 1, so that the axis of the pipe body 3 is consistent with the axis of the first section of the pipe roof steel pipe 1 and the pipe body and the first section of the pipe roof steel pipe 1 are connected as a whole;

[0046] 303. Weld the rear end of the pipe body to the jacking machine, push most of the first section of pipe roof steel pipe 1 with the first section of steel reinforcement skeleton installed into the pipe roof pilot hole, leaving only the tail of the first section of pipe roof steel pipe exposed outside the pipe roof pilot hole, and then remove the tool sleeve.

[0047] S4: Extension of steel pipes and reinforcing steel frame for pipe shed:

[0048] 401. Fit the connecting steel pipe 5 onto the front end of the next section of the pipe shed steel pipe 1, align the next section of the pipe shed steel pipe 1 and the reinforcing steel skeleton 2 placed inside the next section of the pipe shed steel pipe with the axis of the previous section of the pipe shed steel pipe 1, and weld the two sections of reinforcing steel skeleton 2 together.

[0049] 402. Install a pipe clamp 6 at the tail of the previous section of pipe roof steel pipe 1 and at the front of the next section of pipe roof steel pipe 1 to clamp the pipe roof steel pipe 1. Using the two clamps 6 as attachment points, use a chain hoist or jack to bring the two sections of pipe roof steel pipe 1 together and tighten them. During the process of bringing the pipe roof steel pipe 1 together, the next section of pipe roof steel pipe 1 moves forward. The length of the rebar skeleton 2 exposed at the tail of the next section of pipe roof steel pipe 1 is used for the next rebar skeleton extension.

[0050] 403, Remove clamp 6;

[0051] Preferably, between steps 402 and 403, the following steps are performed: welding the front end of the subsequent pipe roof steel pipe 1 and the tail end of the preceding pipe roof steel pipe 1 at the joint and grinding the weld smooth; then moving the middle part of the connecting steel pipe 5 to the joint, and then welding both ends of the connecting steel pipe 5 to the subsequent pipe roof steel pipe 1 and the preceding pipe roof steel pipe respectively; this step can further enhance the reliability of the two steel pipe sections.

[0052] S5: Pipe roof steel pipe segment jacking insertion hole:

[0053] Install the tool sleeve at the tail of the second section of pipe roof steel pipe 1 using the method in step 302, and then connect the jacking machine using the method in step 303. Use the jacking machine to push most of the second section of pipe roof steel pipe 1 into the pipe roof pilot hole, leaving only the tail of the second section of pipe roof steel pipe exposed outside the pipe roof pilot hole. Remove the tool sleeve.

[0054] S6: Increase the segment number of the pipe roof steel pipe by 1, and then repeat steps S4 and S5 until the m-th pipe roof steel pipe is pushed into the pipe roof pilot hole. Use a jacking tool to push the tail of the m-th pipe roof steel pipe completely into the pipe roof pilot hole. The tail of the m-th pipe roof steel pipe is flush with the opening of the pipe roof pilot hole. The entire pipe roof steel pipe 1 is now installed.

[0055] S7: Repeat steps S1 to S6 until all pipe roof steel pipes 1 are installed.

[0056] Although preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other modifications under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these modifications are within the scope of protection of the present invention.

Claims

1. A method for segmented installation of reinforced pipe roof in tunnels, characterized in that... Includes the following steps: S1: Segmented fabrication of steel pipes and reinforcing steel frame for pipe sheds: Based on the design length of the tunnel pipe roof and the length of the raw material steel pipes brought to the site, the pipe roof steel pipes are divided into several sections, which are numbered sequentially from the front end to the rear end as the first section, the second section... the nth section, the n+1th section... the mth section; correspondingly, the steel reinforcement skeleton to be installed in each section of the pipe roof steel pipe is divided into m sections, and the section number of the steel reinforcement skeleton is the same as the section number of the pipe roof steel pipe. The length of the first section of the steel reinforcement cage is equal to the length of the first section of the pipe shed steel pipe plus the length of the steel reinforcement cage joint section. The length of the steel reinforcement cage from the second section to the m-1th section is equal to the length of the corresponding steel pipe section of the pipe shed. When the connection method of the steel reinforcement cage is lap welding, the length of the steel reinforcement cage is increased by the length of the lap section. The length of the steel reinforcement cage in section m is equal to the length of the steel pipe in section m of the pipe shed minus the length of the steel reinforcement cage joint section. S2: The reinforcing steel frame is inserted into the corresponding segment of the pipe roof steel pipe: The steel wire rope is passed through the steel pipe of the pipe roof from the inside and connected to the end of the steel reinforcement cage of the corresponding segment. The steel reinforcement cage is then pulled into the steel pipe of the pipe roof of the corresponding segment. The length of the first section of the reinforcing steel cage exposed at the tail of the first section of the pipe roof steel pipe joint. The length of the exposed rebar cage joint section at the front end of the corresponding segment of the pipe roof steel pipe in sections 2 to m. S3: First section of pipe roof steel pipe jacking hole:

301. Prepare a tool sleeve, the tool sleeve including a tube body, with multiple guide rods evenly distributed along the circumference of the outer wall of the tube body, the rear ends of the multiple guide rods being fixedly connected to the outer wall of the front end of the tube body, and the length of the front end of the multiple guide rods extending beyond the front end of the tube body being not less than 4 times the diameter of the tube body, the central axis of the guide rods being parallel to the central axis of the tube body; the length of the tube body is greater than the length of the exposed steel reinforcement skeleton joint.

302. Insert the front end of the first section of the pipe roof steel pipe with the first section of the reinforcing steel skeleton installed into the pipe roof pilot hole. Install the tool sleeve at the tail end of the first section of the pipe roof steel pipe. The front end of the pipe body is pressed against the tail end of the first section of the pipe roof steel pipe. The joint section of the reinforcing steel skeleton extends into the inside of the pipe body. The guide rod is close to the outer wall of the first section of the pipe roof steel pipe, so that the axis of the pipe body is consistent with the axis of the first section of the pipe roof steel pipe and the pipe body and the first section of the pipe roof steel pipe are connected as a whole.

303. Weld the rear end of the pipe body to the jacking tool, and push most of the first section of the pipe roof steel pipe, which has the first section of the reinforcing steel skeleton installed, into the pipe roof pilot hole, leaving only the tail end of the first section of the pipe roof steel pipe protruding outside the pilot hole. Then remove the tool sleeve. S4: Extension of steel pipes and reinforcing steel frame for pipe shed:

401. The connecting steel pipe is fitted onto the front end of the next section of the pipe shed steel pipe. The next section of the pipe shed steel pipe and the reinforcing steel skeleton placed inside the next section of the pipe shed steel pipe are aligned with the axis of the previous section of the pipe shed steel pipe. The two sections of reinforcing steel skeleton are welded together.

402. Install a pipe clamp at the tail of the previous section of the pipe roof steel pipe and at the front of the next section of the pipe roof steel pipe to clamp the pipe roof steel pipe. Using the two clamps as attachment points, use a chain hoist or jack to pull the two sections of the pipe roof steel pipe together and tighten them. During the process of pulling the pipe roof steel pipe together, the next section of the pipe roof steel pipe moves forward. The length of the rebar cage joint section exposed at the tail of the next section of the pipe roof steel pipe is used for the next rebar cage extension. 403, Remove the clamps; S5: Pipe roof steel pipe segment jacking insertion hole: Install the tool sleeve at the tail of the second section of the pipe roof steel pipe using the method in step 302, and then connect the jacking machine using the method in step 303. Use the jacking machine to push most of the second section of the pipe roof steel pipe into the pipe roof pilot hole, leaving only the tail of the second section of the pipe roof steel pipe exposed outside the pipe roof pilot hole. Then remove the tool sleeve. S6: Increase the segment number of the pipe roof steel pipe by 1, and then repeat steps S4 and S5 until the m-th pipe roof steel pipe is pushed into the pipe roof pilot hole. Use the jacking tool to push the tail of the m-th pipe roof steel pipe completely into the pipe roof pilot hole. The tail of the m-th pipe roof steel pipe is flush with the opening of the pipe roof pilot hole. The entire pipe roof steel pipe is now installed. S7: Repeat steps S1 to S6 until all pipe roof steel pipes are installed.

2. The method for segmented installation of reinforced pipe roof in tunnels according to claim 1, characterized in that... Includes the following steps: Between steps 402 and 403, the following steps are performed: the front end of the next section of the pipe roof steel pipe and the tail end of the previous section of the pipe roof steel pipe are welded together and the weld is ground smooth; then the middle part of the connecting steel pipe is moved to the joint, and then both ends of the connecting steel pipe are welded to the next section of the pipe roof steel pipe and the previous section of the pipe roof steel pipe respectively.

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