Round jacking pipe anti-torsion structure

Abstract

A round pipe jacking anti-torsion structure comprises a pipe jacking track, a pipe jacking machine, pipe joints, anti-torsion cushion blocks and a pull rod device, the pipe jacking machine and the first pipe joint are tied through the pull rod device, the pipe joints are tied through a welding structure or the pull rod device, and the anti-torsion cushion blocks are detachably fixed to the outer side face of the pipe jacking machine or / and the outer side face of the pipe joints. The bottom of the anti-twisting cushion block is tightly attached to the jacking pipe track to form a restraining structure capable of preventing the jacking pipe from twisting; one side face of the anti-twisting cushion block is a curved surface, a first fixing hole is formed in the curved surface, a second fixing hole is formed in the pipe jacking machine or the pipe joint, and the anti-twisting cushion block is fixed to the outer side face of the pipe jacking machine or the pipe joint in the mode that a bolt penetrates through the first fixing hole and the second fixing hole; the pull rod device comprises embedded parts and pull rods, and the embedded parts are embedded in the close positions of the outer walls of the front pipe joint and the rear pipe joint respectively. The device can prevent torsion in the jacking pipe tunneling process, is suitable for a jacking pipe starting stage or an initial tunneling stage, and ensures the stability of the tunneling state and the jacking pipe tunneling precision.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe jacking construction, in particular to a circular pipe jacking anti-twist structure. Background Art

[0002] Pipe jacking is a relatively mature trenchless tunnel forming technology, which is widely used in underground engineering fields such as pipeline laying, sewage pipes, drainage pipes, cable tunnels, etc. Compared with traditional processes such as open-cut methods, pipe jacking has the advantages of less construction disturbance, less impact on the surrounding environment, less noise, less excavation, environmental protection and fastness. In recent years, with the development of pipe jacking technology, the application field of pipe jacking has become more and more extensive, and the strata it traverses have become more and more complex with its wide application.

[0003] The circular pipe jacking technology is the most typical representative of the pipe jacking method. Because it can be applied to high-strength rock areas and generally has a larger cross-section, the strata faced by circular pipe jacking are more complex than those applicable to other trenchless technologies, such as soft and hard soil-rock interlayers, soft and hard rock interlayers and other composite strata, broken zones, high-strength rock strata, etc. The circular pipe jacking method is to cut and break the soil and rock strata by twisting the cutterhead, using the hobs, scrapers, milling cutters and other tools on it. When encountering complex rock-bearing strata, it is very easy to twist and jump due to cutting the soft and hard uneven strata, especially when the pipe jacking machine exits the hole or in the initial excavation stage (20-30m). When the pipe jacking machine exits the tunnel or in the initial excavation stage (20-30m), the cutterhead starts to cut the soft and hard uneven composite strata or high-strength rock strata, which will generate a large reverse force. When it breaks through the constraints of the pipe jacking machine, pipe sections, guide rails or soil, the tunnel will be in an unstable state such as torsion and jumping, causing the center cutter and side cutter used for positioning on the cutterhead to shift, ultimately affecting the accuracy of the pipe jacking. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the above-mentioned prior art and provide a circular jacking pipe anti-twist structure, which provides constraints during the jacking pipe excavation process by contacting the guide rails with anti-twist pads fixed on the jacking machine and the pipe sections, thereby preventing the jacking machine from twisting or jumping in the starting stage or the initial excavation stage (20-30m), thereby ensuring the stability of its excavation state and the accuracy of jacking pipe excavation.

[0005] The utility model is realized by the following technical solutions:

[0006] A circular jacking pipe anti-twist structure includes a jacking pipe track, a jacking machine, a pipe section, an anti-twist pad and a pull rod device. The jacking pipe track includes two parallel guide rails, and the jacking pipe machine and the pipe section are supported on the guide rails. In order to improve the overall rigidity of the tunnel, the jacking pipe machine and the first pipe section are connected by a pull rod device, and the pipe sections are connected by a welding structure or a pull rod device. The anti-twist pad is detachably fixed to the outer side of the jacking pipe machine and / or the pipe section near the guide rail, and at least one anti-twist pad is provided on each side (i.e., each side of the tunnel connected by the jacking pipe machine and the pipe section). Preferably, at least one anti-twist pad is provided on both sides of each jacking pipe machine and the pipe section. The bottom of the anti-twist pad fits tightly on the jacking pipe track to form a constraint structure that can prevent the jacking pipe from twisting, which is suitable for the starting stage or initial excavation stage of jacking pipe.

[0007] Furthermore, one side of the anti-twist pad is a curved surface that is adapted to the side of the pipe jacking machine or the pipe section, and can better fit the side of the pipe jacking machine or the pipe section. A first fixing hole that runs through the entire anti-twist pad is provided on the curved surface, and a second fixing hole is provided at a corresponding position on the pipe jacking machine or the pipe section near the guide rail. The anti-twist pad is fixed to the outer surface of the pipe jacking machine or the pipe section by bolts passing through the first fixing hole and the second fixing hole.

[0008] Furthermore, the first fixing holes are provided with two parallel holes, each of which is a long slot hole, which is convenient for adjusting the installation position of the anti-twist pad and assembling. The aperture of the first fixing hole is slightly larger than the aperture of the second fixing hole. There are four second fixing holes, that is, each anti-twist pad corresponds to four second fixing holes, and every two second fixing holes correspond to one long slot hole. The double-hole fixing method can effectively increase the stability of the pad and prevent twisting.

[0009] Furthermore, the two long slot holes are arranged obliquely and parallel, and the projection of the long slot holes in the vertical direction is at an angle of 45 degrees to the horizontal plane, so that the anti-twist pad can be moved in a plane before being fixed to better fit the guide rail.

[0010] Furthermore, when the pipe joint is a concrete pipe joint, the second fixing hole thereon is a hole formed by a pre-embedded sleeve, and the steel pipe joint and the jacking machine can directly open a hole; the anti-twist pad is a cast iron block or a prefabricated high-strength concrete block. When the anti-twist pad is a prefabricated high-strength concrete block, the first fixing hole thereon is a hole formed by a special module.

[0011] The wall of the steel pipe joint is thin and difficult to fix. Furthermore, when the pipe joint is a steel pipe joint, the bolt passes through the second fixing hole on the steel pipe joint and is fixed on its inner wall by a double-layer nut; when the pipe joint is a concrete pipe joint, the concrete pipe joint is fixed by bolts, embedded sleeves and anti-twist pads.

[0012] When a tie rod device is used to tie the pipe sections, the tie rod device includes embedded parts and tie rods. The embedded parts are respectively embedded at similar positions on the outer walls of the front and rear pipe sections. The two ends of the tie rod are respectively fixedly connected to the embedded parts on the front and rear pipe sections to achieve the tying of the front and rear pipe sections.

[0013] Furthermore, the embedded parts include embedded steel plates and embedded feet welded to each other, the embedded steel plates are exposed on the outer wall of the pipe section, the pull rod is a channel steel, and both ends of the pull rod are respectively welded to the embedded steel plates on the two adjacent front and rear pipe sections.

[0014] Furthermore, the guide rail is made of an I-beam, which is inclined to form an inclined surface that matches the outer side surfaces of the pipe jacking machine and the pipe section. The pipe jacking machine and the pipe section are supported on the inclined surface. At the same time, an upper plane is also provided on the I-beam, and the bottom of the anti-twist pad is in contact with the upper plane.

[0015] When the anti-twist pad comes to the front of the hole, the anti-twist pad needs to be removed. Furthermore, after the anti-twist pad is removed, the second fixing hole on the pipe jacking machine is sealed with a structure combining a waterproof rubber ring and a plug bolt, and the second fixing hole on the steel pipe section is sealed with a structure combining a steel pad pre-welded on the inner wall of the steel pipe section, a waterproof rubber ring and a plug bolt.

[0016] The utility model provides anti-twist pads on both sides of the pipe jacking machine and the pipe section, and the anti-twist pads abut against the guide rails to form constraints, thereby preventing the pipe jacking machine and the pipe section from twisting during the pipe jacking excavation process. The utility model is suitable for the starting stage of pipe jacking or the initial excavation stage (20-30m), and ensures the stability of its excavation state and the accuracy of pipe jacking excavation. Long slot holes are provided on the anti-twist pads, and matched with the fixing holes opened on the pipe jacking machine and the pipe section, so that the anti-twist pads can be installed movably and can be recycled and reused. The design of two parallel long slot holes can facilitate the installation and adjustment of the anti-twist pads and ensure stability and reliability. The anti-twist pads can be removed before the pipe jacking enters the hole, and corresponding sealing measures are taken to seal the openings, which will not affect the subsequent pipe jacking construction. Pull rod devices are used to tie the pipe jacking machine and the pipe section, and between the pipe sections, so as to further improve the rigidity of the tunnel and improve the anti-twist effect at the start of pipe jacking. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model.

[0018] Figure 2 It is a schematic structural diagram of the anti-twist pad in the embodiment of the utility model.

[0019] Figure 3 It is a front schematic diagram of the anti-twist pad in the embodiment of the utility model.

[0020] Figure 4 It is a side view of the anti-twist pad in the embodiment of the utility model.

[0021] Figure 5 It is a schematic diagram of the bolt connection of the anti-twist pad in the embodiment of the utility model.

[0022] Figure 6 It is a partial structural schematic diagram of the casing of the pipe jacking machine in an embodiment of the utility model.

[0023] Figure 7 It is a schematic diagram of the connection between the anti-twist pad and the casing of the pipe jacking machine in an embodiment of the utility model.

[0024] Figure 8 It is a schematic diagram of the blocking of the casing of the pipe jacking machine in the embodiment of the utility model.

[0025] Fig. 9 It is a partial structural schematic diagram of the steel pipe joint in the embodiment of the utility model.

[0026] Fig.10 It is a schematic diagram of the connection between the anti-twist pad and the steel pipe joint in the embodiment of the utility model.

[0027] Fig.11 It is a schematic diagram of the plugging of the steel pipe joint in the embodiment of the utility model.

[0028] Fig.12 It is a schematic diagram of the connection between the anti-twist pad and the concrete pipe section in the embodiment of the utility model.

[0029] Fig.13 It is a schematic structural diagram of the concrete pipe inter-section tie rod device in the embodiment of the utility model.

[0030] Fig.14 It is a schematic structural diagram of a tie rod device between two adjacent concrete pipe sections in an embodiment of the utility model.

[0031] Fig.15 for Fig.14 Schematic diagram of the structure of the BB section.

[0032] Fig.16 for Fig.15 Schematic diagram of the structure in CC direction.

[0033] Fig.17 for Fig.16 Schematic diagram of the structure of the DD section.

[0034] Figure numerals: 1-pipe jacking track; 2-pull rod device; 3-pipe jacking machine; 4-pipe section; 5-anti-twist pad; 6-fastening bolt; 7-plug bolt; 8-waterproof rubber ring; 9-double nut; 10-steel pad; 11-guide rail; 21-embedded steel plate; 22-embedded foot; 23-pull rod; 31-second fixing hole on the pipe jacking machine; 41-second fixing hole on the pipe section; 42-wooden pad; 51-curved surface; 52-first fixing hole. DETAILED DESCRIPTION

[0035] A circular top pipe anti-twist structure, such as Figure 1 As shown, it includes a pipe jacking track 1, a pipe jacking machine 3, a pipe segment 4, an anti-twist pad 5 and a tie rod device 2. The pipe jacking track 1 includes two parallel guide rails 11. The pipe jacking track 1 is welded by section steel, steel plate and guide rails 11 to provide effective support and precise positioning for the pipe jacking machine 3 and the pipe segment 4. The pipe jacking machine 3 and the pipe segment 4 are supported on the guide rails 11. In order to improve the overall rigidity of the tunnel, the pipe jacking machine 3 and the first pipe segment 4 are tied by a tie rod device, and the pipe segments 4 are tied by a welding structure or a tie rod device 2. The steel pipe segments 4 can be tied by integral welding, and the concrete pipe segments 4 can be tied by a tie rod device 2. At the same time, the concrete pipe segments 4 need to be pre-buried with steel plates 21 and partially reinforced.

[0036] The anti-twist pad 5 is detachably fixed to the outer side of the pipe jacking machine 3 and / or the pipe section 4 near the guide rail 11, and at least one anti-twist pad 5 is provided on each side (i.e., each side of the tunnel formed by the pipe jacking machine 3 and the pipe section 4). The bottom of the anti-twist pad 5 fits tightly on the pipe jacking track 1, forming a constraint structure that can prevent the pipe jacking from twisting, which is suitable for the starting stage or initial excavation stage of the pipe jacking. The preferred solution is that at least one anti-twist pad 5 is provided on both sides of each of the pipe jacking machine 3 and the pipe section 4, and the anti-twist pad 5 is fixed on both sides of the pipe jacking machine 3 and the pipe section 4, and fits tightly with the guide rail 11 to form a constraint.

[0037] In order to better fix the anti-twist pad 5, in this embodiment, Figures 2 to 5 As shown, one side of the anti-twist pad 5 is a curved surface 51 adapted to the side of the pipe jacking machine 3 or the pipe section 4, and the radius of the curved surface 51 is adapted to the pipe section 4 and the pipe jacking machine 3 to ensure that the pad better fits the side of the pipe jacking machine 3 or the pipe section 4. A first fixing hole 52 that runs through the entire anti-twist pad 5 is opened on the curved surface 51, and a second fixing hole (corresponding to the second fixing hole 31 on the pipe jacking machine and the second fixing hole 41 on the pipe section) is opened at a corresponding position on the pipe jacking machine 3 or the pipe section 4 near the guide rail 11. Figure 7 , Fig.10 The anti-twist pad 5 is fixed on the outer side of the pipe jacking machine 3 or the pipe section 4 by means of bolts (fastening bolts 6) passing through the first fixing hole 52 and the second fixing hole.

[0038] As one of the implementation methods, Figure 2 , Figure 4 , Figure 5 The first fixing holes 52 are provided with two parallel holes, each of which is a long slot hole, which is convenient for adjusting the installation position of the anti-twist pad 5 and assembling. The aperture of the first fixing hole 52 is slightly larger than the aperture of the second fixing hole. There are four second fixing holes, that is, each anti-twist pad 5 corresponds to four second fixing holes, and every two second fixing holes correspond to one long slot hole. The double-hole fixing method can effectively increase the stability of the pad and prevent twisting.

[0039] In this embodiment, the two long slots are arranged in parallel and obliquely, so that the anti-twist pad 5 can be moved in a plane before being fixed, so as to better fit the guide rail 11. Furthermore, the anti-twist pad 5 of this embodiment is square as a whole, and the two long slots are symmetrically opened with the diagonal of the curved surface 51 as the symmetry axis, and the projection of the two long slots in the vertical direction is at an angle of 45 degrees to the horizontal plane, and the four second fixing holes are arranged correspondingly along the side wall of the pipe jacking machine 3 or the pipe section 4.

[0040] The second fixing hole can be accurately positioned according to the relative position relationship between the size of the jacking machine 3, the pipe section 4 and the guide rail 11, and then holes are opened and threads are cut on both sides. The steel pipe section 4 and the jacking machine 3 can be directly opened (such as Figure 6 , Fig. 9 ), the concrete pipe section 4 can be formed into a hole by using a pre-buried sleeve, such as Fig.12 The anti-twist pad 5 can be made of cast iron blocks, prefabricated high-strength concrete blocks, etc. When the anti-twist pad 5 is a prefabricated high-strength concrete block, it can be formed using a special mold, and the special mold is provided with a hole-forming structure, thereby forming the first fixing hole 52.

[0041] When fixing, the curved surface 51 of the anti-twist pad 5 is closely attached to the outer wall of the pipe jacking machine 3 or the pipe section 4, and the bottom is attached to the guide rail 11 and fixed by bolts (fastening bolts 6). The size of the fastening bolts 6 is adapted to the pipe jacking machine 3, the hole diameter of the steel pipe section 4 and the size of the embedded sleeve of the concrete pipe section 4. The wall of the steel pipe section 4 is relatively thin and difficult to fix. Therefore, when the pipe section 4 is a steel pipe section 4, Fig.10 After the fastening bolt 6 passes through the second fixing hole 41 on the steel pipe section, a double-layer nut 9 is added to the inner wall thereof for fixing. When the pipe section 4 is a concrete pipe section, as Fig.12 As shown, the fixing is performed by tightening the bolts 6 and the embedded sleeve.

[0042] The guide rail 11 can be of existing structure, material and form. In this embodiment, Figure 1The guide rail 11 is made of I-beam, which is inclined to form an inclined surface that matches the outer side of the jacking machine 3 and the pipe section 4. The jacking machine 3 and the pipe section 4 are supported on the inclined surface. The bottom of the anti-twist pad 5 fits with the upper edge of the I-beam. Figure 1 A plane is set on the I-beam so that the bottom of the anti-twist pad 5 fits on the plane, which can relatively reduce wear.

[0043] During the excavation process, observe the fit between the anti-twist pad 5 and the guide rail 11, and adjust the position of the anti-twist pad 5 in time to ensure that it can fit the guide rail 11 to form an effective constraint. The jacking hole has a water-stop rubber ring and a pressure plate, which fits tightly to the jacking machine and the pipe segment shell. At the same time, the guide rail only extends to the hole. Therefore, when the anti-twist pad arrives in front of the hole, the anti-twist pad 5 needs to be removed. First, to avoid damaging the hole structure, and second, the constraint formed by it and the guide rail has failed. The removed pad can be used for the subsequent pipe segment 4. After the anti-twist pad is removed, the openings on the jacking machine 3 and the pipe segment 4 need to be sealed to prevent water seepage. Figure 8 The second fixing hole on the pipe jacking machine 3 is sealed by a structure combining a waterproof rubber ring 8 and a plug bolt 7. The wall thickness of the steel pipe section 4 is small. In order to avoid node damage, Fig.11 The second fixing hole on the steel pipe segment 4 can be sealed by welding a special steel pad 10 on the inner wall in advance, and then using a waterproof rubber ring 8 and a plug bolt 7 to combine the structure. The second fixing hole on the concrete pipe segment 4 does not penetrate the inner wall of the pipe segment, and there will be no water seepage, so no treatment is required.

[0044] As one of the implementation methods, Figures 13 to 17 As shown, when the tie rod device 2 is used to tie the pipe sections 4, the tie rod device 2 between the pipe sections 4 includes embedded parts and tie rods 23. The embedded parts are respectively embedded at similar positions on the outer walls of the front and rear pipe sections 4. The front and rear pipe sections 4 are connected to the embedded parts on the front and rear pipe sections 4 through the two ends of the tie rods 23. In this embodiment, the embedded parts include mutually welded embedded steel plates 21 and embedded feet 22. The embedded steel plates 21 are exposed on the outer walls of the pipe sections 4. The tie rods 23 are channel steels. The two ends of the tie rods 23 are respectively welded to the embedded steel plates 21 on the two adjacent pipe sections 4. The welding surface of the channel steel is its waist surface. The contact between the two pipe sections is provided with a wooden pad 42 for buffering. At the same time, an eagle-shaped rubber ring + a water-expandable rubber strip are used to waterproof the pipe sections. The embedded feet 22 can be embedded feet 22 of a common embedded steel plate 21. The embedded feet 22 extend into the pipe section 4 and are connected with concrete when the pipe section 4 is cast. The pull rod 23 may also be of other structures and forms.

[0045] The pull rod device between the pipe jacking machine 3 and the first pipe section 4 may also be a similar structure. However, since the outer shell of the pipe jacking machine 3 is made of steel, no embedded parts are required, and the connection with the pipe section 4 can be achieved by welding with one end of the pull rod 23.

[0046] The above detailed description is a specific description of a feasible embodiment of the utility model. The embodiment is not intended to limit the patent scope of the utility model. Any equivalent implementation or modification that does not deviate from the utility model should be included in the patent scope of this case.

Claims

1. A circular jacking pipe anti-twist structure, characterized in that: It includes a pipe jacking track, a pipe jacking machine, a pipe section, an anti-twist pad and a pull rod device. The pipe jacking track includes two parallel guide rails. The pipe jacking machine and the pipe section are supported on the guide rails. The pipe jacking machine and the first pipe section are tied together by the pull rod device. The pipe sections are tied together by a welding structure or the pull rod device. The anti-twist pad is detachably fixed on the outer side of the pipe jacking machine and / or the pipe section near the guide rail, and at least one anti-twist pad is provided on each side. The bottom of the anti-twist pad is attached to the pipe jacking track to form a constraint structure that can prevent the jacking pipe from twisting.

2. A circular jacking pipe anti-twist structure according to claim 1, characterized in that: One side of the anti-twist pad is a curved surface that matches the side of the pipe jacking machine or the pipe section, and a first fixing hole that runs through the entire anti-twist pad is provided on the curved surface. A second fixing hole is provided at a corresponding position on the pipe jacking machine or the pipe section close to the guide rail, and the anti-twist pad is fixed to the outer surface of the pipe jacking machine or the pipe section by bolts passing through the first fixing hole and the second fixing hole.

3. A circular jacking pipe anti-twist structure according to claim 2, characterized in that: There are two parallel first fixing holes, each of which is a long slot hole, which is convenient for adjusting the installation position of the anti-twist pad. There are four second fixing holes, and every two second fixing holes correspond to one long slot hole.

4. A circular jacking pipe anti-twist structure according to claim 3, characterized in that: The two long slot holes are arranged obliquely and parallel to each other, and the projection of the long slot holes in the vertical direction is at an angle of 45 degrees to the horizontal plane, so that the anti-twist pad can be moved in a plane before being fixed to better fit the guide rail.

5. The circular jacking pipe anti-twist structure according to claim 2, characterized in that: When the pipe segment is a concrete pipe segment, the second fixing hole thereon is a hole formed by a pre-embedded sleeve; and the anti-twist pad is a cast iron block or a prefabricated high-strength concrete block.

6. The circular jacking pipe anti-twist structure according to claim 2, characterized in that: When the pipe section is a steel pipe section, the bolt passes through the second fixing hole on the steel pipe section and is fixed on its inner wall through a double-layer nut; when the pipe section is a concrete pipe section, it is fixed through bolts, embedded sleeves and anti-twist pads.

7. The circular jacking pipe anti-twist structure according to claim 1, characterized in that: The pull rod device between the pipe sections includes embedded parts and pull rods. The embedded parts are respectively embedded at similar positions on the outer walls of the front and rear pipe sections. The two ends of the pull rod are respectively fixedly connected to the embedded parts on the front and rear pipe sections to achieve the connection of the front and rear pipe sections.

8. The circular jacking pipe anti-twist structure according to claim 7, characterized in that: The embedded parts include embedded steel plates and embedded feet welded to each other, the embedded steel plates are exposed on the outer wall of the pipe section, the pull rod is a channel steel, and the two ends of the pull rod are respectively welded to the embedded steel plates on the front and rear pipe sections.

9. The circular jacking pipe anti-twist structure according to claim 1, characterized in that: The guide rail is made of an I-beam, which is tilted to form a slope that matches the outer side surfaces of the jacking machine and the pipe section. The jacking machine and the pipe section are supported on the slope. An upper plane is also provided on the I-beam, and the bottom of the anti-twist pad is in contact with the upper plane.

10. The circular jacking pipe anti-twist structure according to claim 6, characterized in that: When the anti-twist pad reaches the hole entrance, the second fixing hole on the pipe jacking machine is sealed by a structure combining a waterproof rubber ring and a plug bolt, and the second fixing hole on the steel pipe section is sealed by a structure combining a steel pad pre-welded on the inner wall of the steel pipe section, a waterproof rubber ring and a plug bolt.

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