Grid pipe jacking machine and construction method

Abstract

The present invention discloses a grid pipe jacking machine, comprising a rock-breaking device for breaking rocks, a grid pipe body, and a pushing device for pushing the grid pipe body into an excavated tunnel, wherein the rock-breaking device, the grid pipe body, and the pushing device are arranged in sequence, the middle of the grid pipe body is a through cavity, and the pipe wall of the grid pipe body has a plurality of openings for installing a permanent support device. A construction method using the grid pipe jacking machine is also provided, and the beneficial effects of the present invention are as follows: the grid pipe body is a cavity structure, which is lighter and more flexible to transport than traditional concrete pipe segments or solid steel pipe segments, reducing the requirements for transportation equipment and the transportation cost of the pipe body, and the grid pipe body can be reused, and the construction cost is low.

Description

Technical Field

[0001] The invention relates to mining equipment and a construction method, in particular to a pipe jacking machine and a construction method. Background Art

[0002] At present, pipe jacking machines use closed cylindrical pipes to provide support for tunnels and provide thrust for excavation equipment (pipe jacking machine host). After the tunnel excavation is completed, the pipe remains in the tunnel as a support device. Traditional pipe jacking machines are mostly used to excavate tunnels in soil layers. For hard rock formations, the rock has higher strength and better self-supporting capacity. The use of anchor rods, anchor cables or grouting technology can meet the needs of tunnel support without the need for closed cylindrical pipes for support.

[0003] Application No.: 201720024519.2, discloses a hard rock pipe jacking machine, including a cutting disc, a crushing chamber and a shell, the front end of the crushing chamber is connected to the back of the cutting disc, and the end of the crushing chamber is connected to the front end of the shell, and is characterized in that: it also includes a plurality of rollers, and the rollers are arranged on the front of the cutting disc; the rollers include a cutter shaft, a cutter body, an annular pressure cover, a roller sealing ring, a pressure cover adjusting bolt and a cutter body mounting flange, the cutter body is a circular ring structure, and a cutter ring is arranged on the outer side of the cutter body; the side wall of the cutter body mounting flange is provided with a pressure cover mounting step surface, a sealing ring mounting step surface and a cutter body limiting convex edge in sequence, the annular pressure cover is fixed to the pressure cover mounting step surface by the pressure cover adjusting bolt, the roller sealing ring is sleeved on the sealing ring mounting step surface and is tightly attached to the annular pressure cover; the inner side of the cutter body is symmetrically provided with rolling limiting step surfaces and roller movable step surfaces from both ends to the middle. , a blade mounting convex ring is provided in the middle of the blade shaft, the blade body is sleeved on the side wall of the blade mounting convex ring, the blade mounting flange is installed at both ends of the blade mounting convex ring, and the rolling limit step surface and the blade limit convex edge are in contact with each other; it also includes a plurality of rollers, a strip raceway is formed between the blade mounting flange and the roller movable step surface of the blade body, and the roller is arranged in two of the strip raceways; it also includes a plurality of balls, the blade body and the blade mounting convex ring are both provided with ball movable arc grooves, and the two ball movable arc grooves are opposite to each other, so that a spherical raceway is formed between the blade body and the blade shaft, the spherical raceway is arranged between the two strip raceways, and the ball is arranged in the spherical raceway; it also includes a hydraulic motor and a central rotating shaft, the hydraulic motor is arranged inside the shell, the output shaft of the hydraulic motor is connected to the cutting disc through the central rotating shaft, and the hydraulic motor drives the cutting disc to rotate. It is a closed pipe body with a complex structure, too heavy body, and too high transportation and material costs, which affects the application of pipe jacking machine in tunnel excavation in hard rock formations.

[0004] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0005] The technical problem to be solved by the present invention is: how to solve the problem in the prior art that for rocks with relatively high strength, the closed pipe jacking machine has high material cost and excessively high transportation cost.

[0006] The present invention solves the above technical problems through the following technical means:

[0007] The grid pipe jacking machine includes a rock breaking device for breaking rocks, a grid pipe body, and a pushing device for pushing the grid pipe body into an excavated tunnel. The rock breaking device, the grid pipe body, and the pushing device are arranged in sequence. The middle part of the grid pipe body is a through cavity, and the pipe wall of the grid pipe body has a plurality of openings for installing permanent support devices.

[0008] The grid pipe jacking machine in the present invention breaks rocks through rock breaking equipment, and the pushing device continuously pushes the grid pipe body into the tunnel to realize the advancement of the rock breaking equipment and the grid pipe body. After the grid pipe body enters the tunnel, it can be used as a temporary support for the tunnel to ensure the safety of the tunnel support, and permanent support devices such as anchor rods, anchor cables, grouting pipes, etc. can be installed into the rock body through the openings of the grid pipe body. After the permanent support device is installed, the grid pipe body is retained or removed as needed; the grid pipe body is a hollow structure, which is lighter and more flexible to transport than traditional concrete pipe segments or solid steel pipe segments, reducing the requirements for transportation equipment and the transportation cost of the pipe body, and the grid pipe body is reusable, with low construction cost.

[0009] Preferably, the grid tube body comprises a plurality of tube segments, and the plurality of tube segments are connected end to end.

[0010] Preferably, the side of the tube segment has a connection hole, and the adjacent tube segments are detachably connected through the fasteners and the connection hole. The top pipe grid tube body can be disassembled into several tube segments, which is convenient for transportation, assembly and replacement.

[0011] Preferably, the number of the pipe segments is greater than three.

[0012] Preferably, the grid tube body is multiple, and the adjacent grid tube bodies can be detachably connected. The required length can be assembled according to the needs, and the use is more flexible. Here, each section of the tube body can be connected or not. Under the thrust of the jacking device, the tube bodies are squeezed together and will not loosen. If there is a higher requirement for the stability of the grid tube body, holes can be drilled on the contact surface of the adjacent tube bodies and connected with bolts or other fasteners.

[0013] Preferably, the outer contour of the grid tube body is consistent with the shape of the tunnel or tunnel excavation section, and can fit the section to ensure the reliability of support.

[0014] Preferably, the opening is one or a combination of circular, square, rectangular, diamond, and waist-shaped holes. The opening shape is not limited, as long as there is an opening or gap, the inside of the pipe body can directly contact the surrounding rock surface of the tunnel, and does not affect the installation of support materials such as anchor rods and anchor cables.

[0015] Preferably, the permanent support device is one or a combination of an anchor rod, an anchor cable, and a grouting pipe.

[0016] Preferably, it also includes a reaction wall for bearing the propulsion reaction force during excavation, the reaction wall is located at one end of the jacking device away from the grid tube body, and the jacking device abuts against the reaction wall.

[0017] The present invention also provides a construction method using the above-mentioned grid pipe jacking machine, comprising the following steps: the roller cutter at the front end of the rock breaking equipment breaks the rock, the pushing device continuously pushes one or more grid pipe bodies into the tunnel in sequence, the pushing device pushes the grid pipe body and the rock breaking equipment forward until the tunnel excavation work is completed, and the permanent support device is installed from the opening of the grid pipe body into the rock body. After the permanent support device is installed, the grid pipe body is retained as support, or the grid pipe body is removed and transported out of the tunnel.

[0018] The advantages of the present invention are:

[0019] (1) The grid pipe jacking machine of the present invention breaks rocks through rock breaking equipment, and the pushing device continuously pushes the grid pipe body into the tunnel to realize the advancement of the rock breaking equipment and the grid pipe body. After the grid pipe body enters the tunnel, it serves as a temporary support for the tunnel to ensure the safety of the tunnel support, and permanent support devices such as anchor rods, anchor cables, grouting pipes, etc. can be installed into the rock body through the opening of the grid pipe body. After the permanent support device is installed, the grid pipe body is retained or removed as needed; the grid pipe body is a cavity structure, which is lighter and more flexible to transport than traditional concrete pipe segments or solid steel pipe segments, reducing the requirements for transportation equipment and the transportation cost of the pipe body, and the grid pipe body can be reused, with low construction cost;

[0020] (2) The top pipe grid tube body can be disassembled into several segments, which is convenient for transportation, assembly and replacement;

[0021] (3) The adjacent grille tube bodies can be detachably connected and can be assembled to the required length according to the needs, making the use more flexible;

[0022] (4) The outer contour of the grid pipe body is consistent with the shape of the roadway or tunnel excavation section and can fit the section to ensure the reliability of support.

[0023] (5) The construction method of the present invention is simple and easy to operate, and has strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 2 is a schematic structural diagram of a grid pipe jacking machine according to an embodiment of the present invention;

[0025] Figure 2 is a schematic structural diagram of a grid tube body according to a second embodiment of the present invention;

[0026] Figure 3 It is a structural diagram of the pipe segment;

[0027] Figure 4 This is a schematic diagram of the construction steps of the grid pipe jacking machine;

[0028] Figure 5 This is a schematic diagram of the second construction step of the grid pipe jacking machine;

[0029] Figure 6 This is a schematic diagram of the construction step three of the grid pipe jacking machine;

[0030] Figure 7 This is a schematic diagram of the fourth construction step of the grid pipe jacking machine;

[0031] Figure 8 This is a schematic diagram of the fifth construction step of the grid pipe jacking machine.

[0032] Reference numerals in the figure: rock breaking equipment 1, grid pipe body 2, opening 21, pipe segment 22, connecting hole 221, jacking device 3, anchor rod 4, reaction wall 5. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Embodiment 1:

[0035] like Figure 1 As shown, the grid pipe jacking machine comprises a rock breaking device 1 for breaking rocks, a grid pipe body 2, and a pushing device 3 for pushing the grid pipe body into an excavated tunnel, wherein the rock breaking device 1, the grid pipe body 2, and the pushing device 3 are arranged in sequence;

[0036] The front side of the rock breaking device 1 is provided with a roller cutter for breaking rocks. The rock breaking device 1 in this embodiment can refer to the rock breaking device in the prior art, and has a power output device, such as a hydraulic motor, etc. The hydraulic motor drives the roller cutter to rotate to achieve cutting.

[0037] The middle part of the grid tube body 2 is a through cavity, and the tube wall of the grid tube body 2 has a plurality of openings 21 for installing a permanent support device. The grid tube body 2 in this embodiment includes a plurality of annular connecting plates and a plurality of cylindrical connecting rods, the plurality of annular connecting plates are arranged at intervals, the plurality of cylindrical connecting rods are evenly connected to adjacent annular connecting plates, and rectangular openings 21 are formed between the cylindrical connecting rods.

[0038] The annular connecting plate can be composed of multiple arc-shaped connecting plates, which are arranged at intervals, and cylindrical connecting rods are connected between the arc-shaped connecting plates to form an assembly, and then the assembly is spliced ​​into an annular part, which can also be easy to assemble and disassemble.

[0039] Combination Figure 4 , Figure 5 As shown, there are multiple grid tube bodies 2, and adjacent grid tube bodies 2 may be connected or not connected, and may be assembled to the required length as required, which is more flexible to use. Under the thrust of the jacking device 3, each grid tube body 2 is squeezed together and will not loosen. In this case, fasteners may not be used for connection. If there are higher requirements for the stability of the grid tube body 2, holes may be drilled on the contact surfaces of adjacent tube bodies and connected with bolts or other fasteners.

[0040] Combination Figures 4 to 8 As shown, in this embodiment, the grid pipe jacking machine breaks rocks through the rock breaking equipment 1, and the pushing device 3 continuously pushes the grid pipe body 1 into the tunnel to realize the advancement of the rock breaking equipment 1 and the grid pipe body 2. After the grid pipe body 2 enters the tunnel, it serves as a temporary support for the tunnel to ensure the safety of the tunnel support, and permanent support devices such as anchor rods 4, anchor cables, grouting pipes, etc. can be installed into the rock body through the openings 21 of the grid pipe body 2. After the permanent support device is installed, the grid pipe body is retained as needed, or the rock conditions are good and only the permanent support device can ensure support, and the grid pipe body 2 can be removed; the grid pipe body 2 is a cavity structure, which is lighter and more flexible to transport than traditional concrete pipe segments or solid steel pipe segments, reducing the requirements for transportation equipment and the transportation cost of the pipe body, and the grid pipe body is reusable, with low construction cost.

[0041] Embodiment 2:

[0042] like Figure 2 , Figure 3 As shown, the grille tube structure of the second embodiment is different from that of the first embodiment;

[0043] The grid tube body 2 includes a plurality of tube segments 22, and the plurality of tube segments 22 are connected end to end. In this embodiment, the tube segment 22 is an arc structure with a central angle of 90 degrees, and the grid tube body 2 is assembled by connecting four arc structures end to end, and the arc structure has a plurality of circular openings 21, and the side has a connecting hole 221. The adjacent tube segments 22 are detachably connected through fasteners and connecting holes, and the top tube grid tube body 2 is disassembled into several tube segments 22, which is convenient for transportation, assembly, and replacement.

[0044] The outer contours of the grid tube body 2 in the above-mentioned first and second embodiments are both cylindrical, but are not limited thereto and may also be rectangular, as long as the outer contour of the grid tube body is consistent with the shape of the tunnel or tunnel excavation section.

[0045] In addition, the opening 21 can also be a diamond-shaped, waist-shaped hole, etc. The opening 21 is not limited to a certain shape, as long as there is an opening or a gap, the inside of the grid tube body 2 can directly contact the surrounding rock surface of the tunnel, and the installation of supporting materials such as anchor rods 4 and anchor cables is not affected.

[0046] Similarly, the distance between the openings 21 only needs to meet the distance for installing the anchor rods 4 and anchor cables. For example, if the permanent support structure is anchor rods 4 and the spacing between the rows is 1m, the spacing between the openings or gaps of the grid tube body should be at least 1m.

[0047] The permanent support device is one or a combination of anchor rods 4, anchor cables, and grouting pipes.

[0048] Embodiment three:

[0049] like Figure 1 As shown, based on the above-mentioned embodiment 1, the grid pipe jacking machine also includes a reaction wall 5 for bearing the thrust reaction force during excavation. The reaction wall 5 is located at one end of the jacking device 3 away from the grid pipe body 2, and the jacking device 3 abuts against the reaction wall 5.

[0050] The reaction wall is located at the starting point of the excavation equipment, and the reaction wall is perpendicular to the excavation direction, providing a pushing reaction force for the propulsion device. In this embodiment, the propulsion device 3 is a propulsion cylinder, and the rear end of the propulsion cylinder is against the reaction wall, and the head of the propulsion cylinder pushes the rear end of the grid tube body 2, and each grid tube body 2 is closely arranged to transmit the propulsion force to the rock breaking device 1.

[0051] The specific structure of the reaction wall is not limited, as long as it can withstand the thrust reaction during excavation without major deformation or damage. If there is a vertical rock surface at the starting point, the rock surface is reinforced with steel plates or concrete as the reaction wall; if there is no vertical rock surface nearby, a stable steel structure or a cast concrete reaction wall structure is required.

[0052] The present invention also provides a construction method using the grid pipe jacking machine, comprising the following steps:

[0053] like Figure 4 As shown, step 1: the roller cutter at the front end of the rock breaking device 1 breaks the rock, the pushing device 3 pushes the rear end of the grid pipe body 2, pushes the pipe jacking machine forward, and the reaction wall provides a pushing reaction force;

[0054] like Figure 5 As shown, step 2: after the jacking device 3 is extended to the maximum stroke, the jacking device is retracted, and the pipe segments 22 are assembled into a grid tube body 2, which is placed between the jacking device 3 and the previous grid tube body 2;

[0055] like Figure 6 As shown, step three: the pushing device 3 continues to push the tail of the newly added grid tube body 2 to advance;

[0056] like Figure 7 As shown, step 4: after the tunnel excavation is completed, the anchor rod 4 is driven into the rock wall through the opening 21;

[0057] like Figure 8 As shown, step five: after the anchor rod 4 is installed, you can choose to keep the grid tube body 2 as a support, or disassemble the grid tube body 2 into grid tube segments 22 and transport them out of the tunnel for reuse.

[0058] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. The construction method using a grid pipe jacking machine is characterized in that: The following steps are involved: The roller cutter at the front end of the rock-breaking equipment breaks the rock, and the jacking device continuously pushes one or more grid pipe bodies into the tunnel in sequence. The jacking device pushes the grid pipe body and the rock-breaking equipment forward until the tunnel excavation work is completed, and the permanent support device is installed from the opening of the grid pipe body into the rock body. After the permanent support device is installed, the grid pipe body is retained as support, or the grid pipe body is removed and transported out of the tunnel; The grid pipe jacking machine includes a rock-breaking device for breaking rocks, a grid pipe body, and a pushing device for pushing the grid pipe body into an excavated tunnel. The rock-breaking device, the grid pipe body, and the pushing device are arranged in sequence. The middle of the grid pipe body is a through cavity, and the pipe wall of the grid pipe body has a plurality of openings for installing a permanent support device. The grid pipe body includes a plurality of annular connecting plates and a plurality of cylindrical connecting rods. The plurality of annular connecting plates are arranged at intervals, and the plurality of cylindrical connecting rods are evenly connected to adjacent annular connecting plates, and rectangular openings are formed between the cylindrical connecting rods. It also includes a reaction wall for bearing the advancing reaction force during excavation. The reaction wall is located at one end of the jacking device away from the grid pipe body, and the jacking device abuts against the reaction wall.

2. The construction method according to claim 1, characterized in that: The grid tube body comprises a plurality of tube segments, and the plurality of tube segments are connected end to end.

3. The construction method according to claim 2, characterized in that: The side surfaces of the pipe segments are provided with connecting holes, and adjacent pipe segments are detachably connected via fasteners and the connecting holes.

4. The construction method according to claim 2, characterized in that: The number of the pipe segments is greater than three.

5. The construction method according to claim 1, characterized in that: There are multiple grid tube bodies, and adjacent grid tube bodies are connected in a detachable manner.

6. The construction method according to claim 1, characterized in that: The outer contour of the grid tube body is consistent with the shape of the tunnel or tunnel excavation section.

7. The construction method according to claim 1, characterized in that: The permanent support device is one or a combination of an anchor rod, an anchor cable, and a grouting pipe.

Images