Non-return device for preventing pipe joint from retreating during rectangular pipe jacking construction

Abstract

The invention relates to the technical field of open caisson pipe jacking construction, in particular to a non-return device for preventing a pipe joint from retreating during rectangular pipe jacking construction. A plurality of clamping grooves are formed in the side wall of the pipe joint, a blocking unit is arranged on the support and comprises a clamping block moving in the horizontal direction, the clamping block is in sliding fit with the support in the horizontal direction, a first rolling wheel is rotationally arranged at the end, facing the pipe joint, of the clamping block, and an iron plate is wrapped in the clamping groove. An iron plate is also arranged at the opening of the clamping groove in the extending direction of the pipe joint, an electromagnet is arranged in the clamping block, the clamping block has a first stopping position and a second stopping position when sliding on the support, when the clamping block is located at the first stopping position, the first rolling wheel does not make contact with the side wall of the pipe joint, and when the clamping block moves to the second stopping position, the first rolling wheel does not make contact with the side wall of the pipe joint. And the clamping blocks are clamped and matched with the clamping grooves. The pipe joint can be automatically locked, the pipe joint is prevented from retreating, and the engineering operation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of caisson jacking construction, and in particular to a non-return device for preventing a pipe section from retreating during rectangular jacking construction. Background Art

[0002] During the caisson jacking construction process, a large number of engineering practices have shown that it is difficult to manually chisel out the temporary blocking structure of the jacking tunnel, and there are great safety hazards: during the chiseling process, the integrity of the temporary blocking structure is destroyed and is in an unstable state, which can easily lead to soil collapse at the jacking tunnel and endanger the personal safety of the workers.

[0003] Chinese patent application CN116927806A discloses a pipe jacking construction method, which adopts the caisson as described above, and the steps include: S1, prefabricating the well body, reserving the pipe jacking door and the through hole on the well body, and checking the quality and size of the pipe jacking door and the quality and size of the through hole; S2, inserting the structural reinforcement into the pipe jacking door from the through hole; S3, after the structural reinforcement is inserted, arranging the solidified material layer in the pipe jacking door; S4, sinking the caisson into the construction site; S5, when the caisson is sunk to the lowest point, installing and debugging a pipe jacking machine, and jacking the pipe jacking machine so that the cutter head of the pipe jacking machine is close to the pipe jacking door; S6, pulling out the structural reinforcement, continuing to jack the pipe jacking machine, so that the cutter head of the pipe jacking machine pushes open the solidified material layer, and performing subsequent pipe jacking construction.

[0004] Although the above scheme avoids safety hazards and reduces the difficulty of construction, during the jacking construction, a jack is usually used to push the pipe section into the tunnel gate. The thrust of the jack during operation can reach 1,200 tons. When the jack is withdrawn from one end of the pushed-in pipe section, the pipe section will retreat, and the retreat of the pipe section will also cause the risk of left and right displacement of the pipe section. The existing coping method is to weld a fixed tripod on site and reserve a pin hole on the pipe section. The pin is passed through one end of the fixed tripod and inserted into the pin hole. However, the work efficiency is low, and the pin itself is a long strip structure, which is prone to bending after long-term use. At the same time, it is also necessary to ensure that the pipe section can be pushed into the specified position by the jack, otherwise the pin cannot be smoothly inserted into the pin hole. Summary of the invention

[0005] In view of the above problems, a non-return device is provided for preventing the pipe section from retreating during rectangular pipe jacking construction. A clamping block is arranged on one side of the pipe section and an electromagnet is arranged in the clamping block. When the pipe section moves, when the iron plate on the side wall of the pipe section passes the front end of the clamping block, the electromagnet after energization drives the clamping block to be adsorbed on the side wall of the pipe section. At the same time, the first roller arranged at the end of the clamping block rolls with the side wall of the pipe section to ensure that the clamping block can automatically be clamped with the clamping groove, and the clamping block is supported by the support unit to avoid bending of the clamping block.

[0006] In order to solve the problems of the prior art, the present invention provides a non-return device for preventing a pipe section from retreating during rectangular jacking construction, comprising a bracket arranged on one side of the pipe section; a plurality of clamping grooves are evenly opened on the side wall of the pipe section along the extension direction of the pipe section, a blocking unit is arranged on the bracket, the blocking unit comprises a clamping block moving in the horizontal direction, the clamping block slides with the bracket in the horizontal direction, a first roller is arranged on the end of the clamping block rotating toward the pipe section, an iron plate is coated in the clamping groove, and an iron plate is also arranged at the opening of the clamping groove along the extension direction of the pipe section, an electromagnet is arranged in the clamping block, and the clamping block has a first stop position and a second stop position when sliding on the bracket, when the clamping block is in the first stop position, the first roller does not contact the side wall of the pipe section, after the electromagnet is energized, the clamping block moves from the first stop position to the second stop position, the first roller contacts the iron plate on the side wall of the pipe section, and when the clamping block moves to the second stop position, the clamping block is clamped and matched with the clamping groove.

[0007] Preferably, an inclined chamfer is provided at one end of the clamping groove which faces away from the traveling direction of the pipe section, the number of clamping blocks arranged on the bracket is the same as the number of clamping grooves arranged on the pipe section and corresponds one to one, the spacing between adjacent clamping grooves is the same as the spacing between adjacent clamping blocks, and the first roller rolls in cooperation with the inclined chamfer.

[0008] Preferably, a support unit for supporting the clamping block is provided on one side of the clamping block. After the clamping block is clamped with the clamping slot, the support unit is located on the opposite side of the force-bearing position of the clamping block and the clamping slot, and the support unit and the clamping block form a triangular structure.

[0009] Preferably, the support unit includes a first locking plate slidably arranged on the bracket along the extension direction of the pipe joint, first one-way teeth are evenly arranged on the side of the first locking plate away from the pipe joint, a connecting rod is arranged between the first locking plate and the clamping block, two ends of the connecting rod are respectively hinged to the clamping block and the first locking plate, a second locking plate is arranged on the side of the first locking plate away from the pipe joint, the second locking plate moves in a horizontal direction, and the moving direction of the second locking plate is perpendicular to the extension direction of the pipe joint, and second one-way teeth are evenly arranged on the side of the second locking plate facing the first locking plate, and the first one-way teeth and the second one-way teeth are unidirectionally meshed.

[0010] Preferably, an abutment plate is provided on a side of the second locking plate away from the first locking plate, a straight line formed by the shortest distance between the abutment plate and the second locking plate is parallel to the horizontal plane, a gap exists between the abutment plate and the second locking plate, a spring is provided in the gap along the arrangement direction of the abutment plate and the second locking plate, two ends of the spring are respectively fixedly connected to the abutment plate and the second locking plate, an extension rod is horizontally fixedly provided on a side of the second locking plate facing the abutment plate, the extension rod passes through the end of the abutment plate and slidably cooperates with the abutment plate.

[0011] Preferably, an electric push rod is horizontally arranged at one end of the abutment plate away from the second locking plate, and the end of the electric push rod is fixedly connected to the end of the abutment plate. The electric push rod drives the abutment plate to move in a horizontal direction. When the electromagnet in the clamping block is energized, the output end of the electric push rod extends to its longest state. When the electromagnet is de-energized, the output end of the electric push rod is completely retracted.

[0012] Preferably, a guide rail is fixedly provided on the bracket along the extension direction of the pipe segment, and the guide rail is slidably matched with the first locking plate along the extension direction of the pipe segment.

[0013] Preferably, a push-pull unit is provided on the end of the clamping block away from the pipe joint, and the push-pull unit includes a water tank arranged on the side of the clamping block away from the pipe joint. The water tank moves in a vertical direction, and a support wheel is rotatably provided on a bracket on the upper part of the water tank. A connecting belt is provided between the water tank and the clamping block, and both ends of the connecting belt are respectively fixedly connected to the water tank and the clamping block. The connecting belt is wrapped around the upper part of the support wheel and contacts the support wheel, and the support wheel and the connecting belt roll in cooperation.

[0014] Preferably, a storage box is provided on one side of the water tank, water is stored in the storage box, a water supply pipe is provided between the storage box and the water tank, the water tank is connected to the storage box through the water supply pipe, a water pump is provided on the water supply pipe, the water pump is used to pump water in the storage box into the water tank or pump water in the water tank into the storage box.

[0015] Preferably, a second roller is provided on both sides of the clamping block respectively, and the second roller contacts the side wall of the pipe section on one side of the clamping groove when the clamping block is clamped with the clamping groove, and the axis of the second roller is parallel to the height direction of the bracket.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. When performing the caisson pipe jacking operation, first place the jacking pipe horizontally, and then use the jack to push the jacking pipe into the cave door horizontally. A bracket is set on one side of the pipe section, and a blocking unit is set on the bracket. When the jack is in operation, the electromagnet set in the clamping block is temporarily not started. When the jack is about to complete the installation of the pipe section according to the pre-set program, the electromagnet set in the clamping block is energized. At this time, the area with iron plates on the side wall of the pipe section passes through the front end of the clamping block. When the clamping groove on the side wall of the pipe section passes through the end of the clamping block, the clamping block can be smoothly inserted into the clamping groove, thereby realizing the clamping. The clamping block has a first stop position and a second stop position when moving in the horizontal direction. When the clamping block is located at the first stop position, the electromagnet is in an unpowered state, the clamping block retracts into the bracket, and the first roller at the end of the clamping block does not contact the side wall of the pipe section. When the pipe section needs to be clamped to prevent the pipe section from retreating, the part of the side wall of the pipe section where the iron plate is provided is located at the front end of the clamping block, but the clamping groove does not pass through the front end of the clamping block. Subsequently, the electromagnet is energized, and the electromagnet adsorbs the clamping block on the side wall of the pipe section. The first roller at the end of the clamping block rolls with the side wall of the pipe section. At this time, the clamping block has not reached the second stop position. When the clamping block contacts the side wall of the pipe joint, the jack continues to push the pipe joint forward toward the tunnel gate. As the pipe joint moves, the clamping groove set on the pipe joint moves synchronously with the pipe joint. When the clamping groove moves to the front end of the clamping block, the clamping block slides into the clamping groove and completes the clamping cooperation with the clamping groove. In this way, after the jack pushes the pipe joint in, the blocking unit can automatically lock the pipe joint to prevent the pipe joint from retreating, thereby improving the engineering operation efficiency.

[0018] 2. After the first roller arranged at the end of the clamping block contacts the side wall of the pipe joint, the first roller and the side wall of the pipe joint roll together, avoiding direct contact and sliding cooperation between the end of the clamping block and the side wall of the pipe joint, ensuring that the clamping block will not scratch the side wall of the pipe joint.

[0019] 3. By providing a support unit, when the clamping block is clamped with the clamping groove, the retraction force of the pipe joint will not act completely on the clamping block, but can be shared by the support unit, thereby avoiding the bending of the clamping block when clamped in the clamping groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a non-return device used to prevent the pipe section from retreating during rectangular pipe jacking construction. After the pipe section is fixed, a three-dimensional schematic diagram is drawn with the moving direction of the pipe section marked on it when the pipe section is in the tunnel.

[0021] Figure 2 The invention is a three-dimensional schematic diagram of a non-return device used to fix a pipe segment to prevent the pipe segment from retreating during rectangular pipe jacking construction.

[0022] Figure 3It is a non-return device used to prevent the pipe section from retreating during rectangular pipe jacking construction. Figure 2 A local enlarged schematic diagram of point A in the middle.

[0023] Figure 4 A three-dimensional diagram of a non-return device used to prevent the pipe section from retreating during rectangular pipe jacking construction, with some blocking units removed Figure 1 .

[0024] Figure 5 A three-dimensional diagram of a non-return device used to prevent the pipe section from retreating during rectangular pipe jacking construction, with some blocking units removed Figure 2 .

[0025] Figure 6 It is a non-return device used to prevent the pipe section from retreating during rectangular pipe jacking construction. Figure 5 A local enlarged schematic diagram of point B in the middle.

[0026] Figure 7 The invention is a three-dimensional schematic diagram of a non-return device used to prevent the pipe section from retreating during rectangular pipe jacking construction.

[0027] Figure 8 It is a non-return device used to prevent the pipe section from retreating during rectangular pipe jacking construction. Figure 7 A partial enlarged schematic diagram of point C in the middle.

[0028] Fig. 9 The invention is a cutaway stereoscopic schematic diagram of a non-return device used to prevent the pipe section from retreating during rectangular pipe jacking construction.

[0029] Fig.10 It is a non-return device used to prevent the pipe section from retreating during rectangular pipe jacking construction. Fig. 9 A partial enlarged schematic diagram of point D in the middle.

[0030] The numbers in the figure are:

[0031] 1. Pipe joint; 11. Snap-fit ​​groove; 12. Iron plate; 2. Blocking unit; 21. Snap-fit ​​block; 211. Second roller; 22. First roller; 23. Support unit; 231. Connecting rod; 232. First locking plate; 233. Second locking plate; 234. Spring; 235. Abutment plate; 236. Extension rod; 237. Electric push rod; 238. Guide rail; 24. Push-pull unit; 241. Water tank; 242. Connecting belt; 243. Support wheel; 244. Storage box; 245. Water supply pipe; 3. Bracket. DETAILED DESCRIPTION

[0032] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] Reference Figure 1-Figure 4 and Figure 8 : A non-return device for preventing a pipe section from retreating during rectangular pipe jacking construction, comprising a bracket 3 arranged on one side of the pipe section 1; a plurality of clamping grooves 11 are evenly opened on the side wall of the pipe section 1 along the extension direction of the pipe section 1, a blocking unit 2 is arranged on the bracket 3, and the blocking unit 2 comprises a clamping block 21 moving in the horizontal direction, the clamping block 21 slides with the bracket 3 in the horizontal direction, a first roller 22 is arranged on the end of the clamping block 21 rotating toward the pipe section 1, an iron plate 12 is coated in the clamping groove 11, and an opening of the clamping groove 11 is provided. An iron plate 12 is also provided at the mouth along the extension direction of the pipe section 1, and an electromagnet is provided in the clamping block 21. The clamping block 21 has a first stop position and a second stop position when sliding on the bracket 3. When the clamping block 21 is at the first stop position, the first roller 22 does not contact the side wall of the pipe section 1. After the electromagnet is energized, the clamping block 21 moves from the first stop position to the second stop position, and the first roller 22 contacts the iron plate 12 on the side wall of the pipe section 1. When the clamping block 21 moves to the second stop position, the clamping block 21 is clamped and matched with the clamping groove 11.

[0034] When performing pipe jacking operations, the pipe segment 1 is usually hoisted into the caisson, and then the pipe segment 1 is horizontally set and a jack is provided at one end of the pipe segment 1. The end of the pipe segment 1 is pushed by the jack so that the pipe segment 1 slides into the tunnel door, thereby realizing the operation. After the jack pushes the pipe segment 1 into the tunnel door, when the jack is withdrawn, the pipe segment 1 will retreat, and the pipe segment 1 will deviate left and right during the retreat process. In order to ensure that the pipe segment 1 does not deviate during the jacking operation, a non-return device is provided on one side of the pipe segment 1 to prevent the pipe segment 1 from retreating. The existing non-return devices are all made by welding steel into a tripod in a flash, and a clamping groove 11 is provided on the pipe segment 1, and then a latch is used to pass through the tripod and engage with the clamping groove 11. However, the above method has disadvantages, namely, manual positioning is required each time the latch is plugged into the card slot 11, and the existing latch is an ordinary metal rod structure, which will bend after long-term use, resulting in the latch being unable to be accurately aligned with the card slot 11. The installation time is long and manual operation is required throughout the process, which is time-consuming and labor-intensive, seriously affecting the progress of the project.

[0035] In order to avoid the above situation, the anti-return device is redesigned. The specific structure and working principle are as follows: when performing the caisson jacking operation, the jacking pipe is first placed horizontally, and then the jack is used to push the jacking pipe into the cave door in the horizontal direction. A bracket 3 is provided on one side of the pipe section 1, and a blocking unit 2 is provided on the bracket 3. When the jack is in operation, the electromagnet set in the clamping block 21 is temporarily not started. When the jack is about to complete the installation of the pipe section 1 according to the pre-set program, the electromagnet set in the clamping block 21 is energized. At this time, the area where the iron plate 12 is arranged on the side wall of the pipe section 1 passes through the front end of the clamping block 21. It is worth noting that the energization time of the electromagnet also needs to be pre-set, and the specific electromagnet start time needs to be determined according to the actual situation, but it is necessary to ensure that the clamping groove 11 on the pipe section 1 reaches the clamping block 21 before the electromagnet in the clamping block 21 is energized, so that the electromagnet after energization can make the clamping block 21 contact the side of the pipe section 1 at the front end of the clamping groove 11 first. When the clamping groove 11 on the side wall of the pipe section 1 passes through the end of the clamping block 21, the clamping block 21 can be smoothly inserted into the clamping groove 11, thereby realizing clamping. The clamping block 21 has a first stop position and a second stop position when moving in the horizontal direction. When the clamping block 21 is located at the first stop position, the electromagnet is in an unpowered state, the clamping block 21 is retracted into the bracket 3, and the first roller 22 at the end of the clamping block 21 does not contact the side wall of the pipe section 1. When the pipe section 1 needs to be clamped to prevent the pipe section 1 from retreating, the part of the side wall of the pipe section 1 where the iron plate 12 is provided is located at the front end of the clamping block 21, but the clamping groove 11 does not pass through the front end of the clamping block 21. Then the electromagnet is powered on, and the electromagnet adsorbs the clamping block 21 on the side wall of the pipe section 1. The first roller 22 at the end of the clamping block 21 rolls with the side wall of the pipe section 1. At this time, the clamping block 21 has not reached the second stop position. When the clamping block 21 contacts the side wall of the pipe section 1, the jack continues to push the pipe section 1 toward the tunnel door. As the pipe section 1 moves, the clamping groove 11 arranged on the pipe section 1 moves synchronously with the pipe section 1. When the clamping groove 11 moves to the front end of the clamping block 21, the clamping block 21 slides into the clamping groove 11 and completes the clamping fit with the clamping groove 11. Since the insertion depth of the pipe section 1 is preset, the clamping block 21 can be pre-set to stop when it is clamped into the clamping groove 11. The control of the telescopic length of the output end of the jack is a prior art and will not be repeated here. In this way, it can be ensured that after the jack pushes the pipe section 1, the blocking unit 2 can automatically lock the pipe section 1 to prevent the pipe section 1 from retreating, thereby improving the engineering operation efficiency.

[0036] Reference Figure 1-Figure 10: An inclined chamfer is provided at the end of the clamping groove 11 which is away from the traveling direction of the pipe section 1. The number of the clamping blocks 21 arranged on the bracket 3 is the same as the number of the clamping grooves 11 arranged on the pipe section 1 and corresponds one to one. The spacing between adjacent clamping grooves 11 is the same as the spacing between adjacent clamping blocks 21. The first roller 22 rolls in cooperation with the inclined chamfer.

[0037] In order to ensure the stability of the pipe segment 1 when it is fixed, the blocking unit 2 is provided with a plurality of clamping blocks 21, which are evenly arranged on the bracket 3 along the extension direction of the pipe segment 1. As the pipe segment 1 is gradually pushed into the tunnel door under the action of the jack, the clamping blocks 21 arranged horizontally on the bracket 3 on one side of the pipe segment 1 contact the side wall of the pipe segment 1 in sequence. This is because the electromagnets in the horizontally arranged clamping blocks 21 will be energized in sequence as the pipe segment 1 moves forward. When the first clamping block 21 contacting the side wall of the pipe segment 1 enters the clamping groove 11, the pipe segment 1 continues to move. In this way, the inclined chamfer opened on one end of the clamping groove 11 can guide the clamping block 21 located in the clamping groove 11 to slide out and slide into the next clamping groove 11. When all the clamping blocks 21 are clamped into the clamping groove 11, the jack stops working and withdraws. At this time, since the clamping blocks 21 clamp the clamping groove 11, it is ensured that the pipe segment 1 will not fall back.

[0038] Reference Figure 3 : A support unit 23 is provided on one side of the clamping block 21 to support the clamping block 21. After the clamping block 21 is clamped with the clamping groove 11, the support unit 23 is located on the opposite side of the force position of the clamping block 21 and the clamping groove 11, and the support unit 23 and the clamping block 21 form a triangular structure.

[0039] Reference Figure 8 and Fig. 9 The supporting unit 23 includes a first locking plate 232 which is slidably arranged on the bracket 3 along the extension direction of the pipe section 1, and first one-way teeth are evenly arranged on the side of the first locking plate 232 away from the pipe section 1, and a connecting rod 231 is arranged between the first locking plate 232 and the clamping block 21, and the two ends of the connecting rod 231 are respectively hinged to the clamping block 21 and the first locking plate 232, and a second locking plate 233 is arranged on the side of the first locking plate 232 away from the pipe section 1, and the second locking plate 233 moves in the horizontal direction, and the moving direction of the second locking plate 233 is perpendicular to the extension direction of the pipe section 1, and the second locking plate 233 is evenly arranged on the side of the second locking plate 233 facing the first locking plate 232, and the first one-way teeth and the second one-way teeth are unidirectionally meshed.

[0040] Reference Fig.10: An abutment plate 235 is provided on the side of the second locking plate 233 away from the first locking plate 232, and the straight line formed by the shortest distance between the abutment plate 235 and the second locking plate 233 is parallel to the horizontal plane. There is a gap between the abutment plate 235 and the second locking plate 233, and a spring 234 is provided in the gap along the arrangement direction of the abutment plate 235 and the second locking plate 233, and the two ends of the spring 234 are fixedly connected to the abutment plate 235 and the second locking plate 233 respectively, and an extension rod 236 is horizontally fixedly provided on the side of the second locking plate 233 facing the abutment plate 235, and the extension rod 236 passes through the end of the abutment plate 235 and slidably cooperates with the abutment plate 235.

[0041] Reference Fig. 9 and Fig.10 : An electric push rod 237 is horizontally arranged at one end of the abutment plate 235 away from the second locking plate 233, and the end of the electric push rod 237 is fixedly connected to the end of the abutment plate 235. The electric push rod 237 drives the abutment plate 235 to move in the horizontal direction. When the electromagnet in the clamping block 21 is energized, the output end of the electric push rod 237 extends to the longest state. When the electromagnet is de-energized, the output end of the electric push rod 237 is completely retracted.

[0042] When the electromagnetic in the clamping block 21 starts to be energized, the output end of the electric push rod 237 is in a fully extended state, and the second one-way tooth on the second locking plate 233 is meshed with the first one-way tooth on the first locking plate 232. The first locking plate 232 can only move along the extension direction of the pipe section 1. Since the first locking plate 232 is hinged to one side of the clamping block 21 through the connecting rod 231, when the clamping block 21 moves toward the side wall of the pipe section 1, the clamping block 21 pulls the first locking plate 232 through the connecting rod 231, and the first locking plate 232 moves along the extension direction of the pipe section 1 when the clamping block 21 moves. At this time, the first one-way tooth on the first locking plate 232 is meshed with the second one-way tooth on the second locking plate 233, that is, as the first The locking plate 232 moves along the extension direction of the pipe section 1, and the second locking plate 233 moves back and forth in the horizontal direction. After the first one-way tooth on the first locking plate 232 pushes the second locking plate 233 open, the second locking plate 233 is reset again under the action of the spring 234, so that the second one-way tooth on the second locking plate 233 is always in contact with the first one-way tooth on the first locking plate 232, and due to the one-way meshing of the first one-way tooth and the second one-way tooth, after the clamping block 21 contacts the side wall of the pipe section 1, even if the clamping block 21 has not yet been clamped with the clamping groove 11, the clamping block 21 will not retreat, and when the clamping block 21 is clamped with the clamping groove 11, it can also ensure that the clamping block 21 and the clamping groove 11 are stably clamped. Since there are multiple clamping blocks 21 and clamping grooves 11, the first few clamping blocks 21 need to slide out of the clamping grooves 11 when clamping with the first few clamping grooves 11. At this time, the clamping block 21 will retract, so the electric push rod 237 is required to retract the abutment plate 235, so that the second locking plate 233 is disconnected from the first locking plate 232. When the first roller 22 slides out of the clamping groove 11, the output end of the electric push rod 237 is fully extended again, so that the clamping rod can be smoothly clamped into the next clamping In the slot 11, when all the connecting rods are connected with the connecting slot 11, the worker connects the new pipe section 1 with the end of the pipe section 1 pushed into the hole door and connects it with the end of the new pipe section 1 through the jack. At this time, the connecting block 21 can slide out of the connecting slot 11, and the electric push rod 237 drives the second locking plate 233 to retract. The second locking plate 233 is no longer in contact with the first locking plate 232, and the second locking plate 233 no longer locks the first locking plate 232. At this time, the connecting block 21 can slide out of the connecting slot 11 smoothly.

[0043] Reference Figure 8 A guide rail 238 is fixedly arranged on the bracket 3 along the extension direction of the pipe section 1, and the guide rail 238 and the first locking plate 232 are slidably matched along the extension direction of the pipe section 1.

[0044] This ensures that the first locking plate 232 can only move along the extension direction of the pipe section 1 .

[0045] Reference Figure 5 and Figure 6 A push-pull unit 24 is provided on the end of the clamping block 21 away from the pipe section 1. The push-pull unit 24 includes a water tank 241 provided on the side of the clamping block 21 away from the pipe section 1. The water tank 241 moves in the vertical direction. A support wheel 243 is rotatably provided on the bracket 3 on the upper part of the water tank 241. A connecting belt 242 is provided between the water tank 241 and the clamping block 21. Both ends of the connecting belt 242 are fixedly connected to the water tank 241 and the clamping block 21 respectively. The connecting belt 242 is wound around the upper part of the support wheel 243 and contacts with the support wheel 243. The support wheel 243 and the connecting belt 242 are rollingly matched.

[0046] Reference Figure 7 and Fig. 9 : A storage box 244 is arranged on one side of the water tank 241, and water is stored in the storage box 244. A water supply pipe 245 is arranged between the storage box 244 and the water tank 241. The water tank 241 is connected to the storage box 244 through the water supply pipe 245. A water pump is arranged on the water supply pipe 245. The water pump is used to pump water in the storage box 244 into the water tank 241 or pump water in the water tank 241 into the storage box 244.

[0047] Before the electromagnet is energized, the water pump draws the water in the water tank 241 into the storage tank 244 to ensure that the suction force of the electromagnet after being energized will not be weakened by the water tank 241 containing water using its own gravity. After the clamping block 21 completes the non-return work on the pipe segment 1, the electromagnet is de-energized and the water pump is started at the same time. The water pump draws the water in the storage tank 244 into the water tank 241. After the water tank 241 is filled with water, the weight thereof continues to increase. The water tank 241 pulls the clamping block 21 out of the clamping groove 11 through the connecting belt 242, thereby unlocking the clamping block 21 and the clamping groove 11.

[0048] Reference Figure 8 : A second roller 211 is provided on both sides of the clamping block 21. When the clamping block 21 is clamped with the clamping groove 11, the second roller 211 contacts the side wall of the pipe section 1 on one side of the clamping groove 11. The axis of the second roller 211 is parallel to the height direction of the bracket 3.

[0049] When the clamping block 21 is inserted into the clamping groove 11, the electromagnet in the clamping block 21 is in a continuously energized state, and the first roller 22 at the end of the clamping block 21 contacts the bottom of the clamping groove 11, and under the suction of the electromagnet, the first roller 22 generates a relatively large pressure on the bottom of the clamping groove 11. When the clamping block 21 stops the pipe section 1, the clamping block 21 needs to stay in the clamping groove 11 for a period of time, and at this time the electromagnet is in a continuously energized state, and the contact area between the first roller 22 and the bottom of the clamping groove 11 is small, and the first roller 22 is subjected to a large force. In order to avoid the first roller 22 being subjected to force alone, a second roller 211 is respectively arranged on both sides of the clamping block 21. When the clamping block 21 is inserted into the clamping groove 11, the second roller 211 and the first roller 22 are subjected to force together, thereby avoiding the deformation of the first roller 22 being subjected to force alone.

[0050] Working principle: When performing the caisson pipe jacking operation, the jacking pipe is first placed horizontally, and then the jack is used to push the jacking pipe into the cave door in the horizontal direction. A bracket 3 is provided on one side of the pipe section 1, and a blocking unit 2 is provided on the bracket 3. When the jack is in operation, the electromagnet provided in the clamping block 21 is temporarily not started. When the jack is about to complete the installation of the pipe section 1 according to the pre-set procedure, the electromagnet provided in the clamping block 21 is energized. At this time, the area where the iron plate 12 is arranged on the side wall of the pipe section 1 passes through the front end of the clamping block 21. It is worth noting that the energization timing of the electromagnet needs to be preset, and the specific electromagnet start time needs to be determined according to the actual situation, but it is necessary to ensure that the clamping groove 11 on the pipe section 1 is energized before the electromagnet in the clamping block 21 is energized, so that the electromagnet after energization can make the clamping block 21 contact the side of the pipe section 1 at the front end of the clamping groove 11 first. When the clamping groove 11 on the side wall of the pipe section 1 passes through the end of the clamping block 21, the clamping block 21 can be smoothly inserted into the clamping groove 11, thereby realizing clamping. The clamping block 21 has a first stop position and a second stop position when moving in the horizontal direction. When the clamping block 21 is located at the first stop position, the electromagnet is in an unpowered state, the clamping block 21 is retracted into the bracket 3, and the first roller 22 at the end of the clamping block 21 does not contact the side wall of the pipe section 1. When the pipe section 1 needs to be clamped to prevent the pipe section 1 from retreating, the part of the side wall of the pipe section 1 where the iron plate 12 is provided is located at the front end of the clamping block 21, but the clamping groove 11 does not pass through the front end of the clamping block 21. Then the electromagnet is powered on, and the electromagnet adsorbs the clamping block 21 on the side wall of the pipe section 1. The first roller 22 at the end of the clamping block 21 rolls with the side wall of the pipe section 1. At this time, the clamping block 21 has not reached the second stop position. When the clamping block 21 contacts the side wall of the pipe segment 1, the jack continues to push the pipe segment 1 toward the tunnel entrance. As the pipe segment 1 moves, the clamping groove 11 arranged on the pipe segment 1 moves synchronously with the pipe segment 1. When the clamping groove 11 moves to the front end of the clamping block 21, the clamping block 21 slides into the clamping groove 11 and completes the clamping fit with the clamping groove 11. In this way, it can be ensured that after the jack pushes the pipe segment 1 in, the blocking unit 2 can automatically lock the pipe segment 1 to prevent the pipe segment 1 from retreating, thereby improving the engineering operation efficiency.

[0051] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the protection scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A non-return device for preventing a pipe section from retreating during rectangular pipe jacking construction, comprising a bracket (3) arranged on one side of the pipe section (1); It is characterized in that A plurality of clamping grooves (11) are evenly provided on the side wall of the pipe section (1) along the extension direction of the pipe section (1); a blocking unit (2) is provided on the bracket (3); the blocking unit (2) comprises a clamping block (21) movable in the horizontal direction; the clamping block (21) is slidably matched with the bracket (3) in the horizontal direction; a first roller (22) is provided on the end of the clamping block (21) to rotate toward the pipe section (1); an iron plate (12) is coated in the clamping groove (11), and an iron plate is also provided at the opening of the clamping groove (11) along the extension direction of the pipe section (1). (12), an electromagnet is arranged in the clamping block (21), and the clamping block (21) has a first stop position and a second stop position when sliding on the bracket (3). When the clamping block (21) is in the first stop position, the first roller (22) does not contact the side wall of the pipe section (1). After the electromagnet is energized, the clamping block (21) moves from the first stop position to the second stop position, and the first roller (22) contacts the iron plate (12) on the side wall of the pipe section (1). When the clamping block (21) moves to the second stop position, the clamping block (21) is clamped and matched with the clamping groove (11).

2. The anti-return device for preventing the pipe section from retreating during rectangular pipe jacking construction according to claim 1 is characterized in that: An inclined chamfer is provided at one end of the clamping groove (11) away from the travel direction of the pipe section (1); the number of clamping blocks (21) provided on the bracket (3) is the same as the number of clamping grooves (11) provided on the pipe section (1) and corresponds to each other; the spacing between adjacent clamping grooves (11) is the same as the spacing between adjacent clamping blocks (21); and the first roller (22) is in rolling cooperation with the inclined chamfer.

3. The anti-return device for preventing the pipe section from retreating during rectangular pipe jacking construction according to claim 1 is characterized in that: A support unit (23) for supporting the clamping block (21) is provided on one side of the clamping block (21); after the clamping block (21) is clamped with the clamping slot (11), the support unit (23) is located on the opposite side of the force-bearing position of the clamping block (21) and the clamping slot (11); the support unit (23) and the clamping block (21) form a triangular structure.

4. The anti-return device for preventing the pipe section from retreating during rectangular pipe jacking construction according to claim 3 is characterized in that: The support unit (23) comprises a first locking plate (232) which is slidably arranged on the bracket (3) along the extension direction of the pipe section (1); a first one-way tooth is evenly arranged on the side of the first locking plate (232) away from the pipe section (1); a connecting rod (231) is arranged between the first locking plate (232) and the clamping block (21); two ends of the connecting rod (231) are respectively hinged to the clamping block (21) and the first locking plate (232); a second locking plate (233) is arranged on the side of the first locking plate (232) away from the pipe section (1); the second locking plate (233) moves in a horizontal direction, and the moving direction of the second locking plate (233) is perpendicular to the extension direction of the pipe section (1); a second one-way tooth is evenly arranged on the side of the second locking plate (233) facing the first locking plate (232); the first one-way tooth and the second one-way tooth are unidirectionally meshed.

5. The anti-return device for preventing the pipe section from retreating during rectangular pipe jacking construction according to claim 4 is characterized in that: An abutment plate (235) is provided on a side of the second locking plate (233) away from the first locking plate (232); a straight line formed by the shortest distance between the abutment plate (235) and the second locking plate (233) is parallel to a horizontal plane; a gap exists between the abutment plate (235) and the second locking plate (233); a spring (234) is provided in the gap along the arrangement direction of the abutment plate (235) and the second locking plate (233); two ends of the spring (234) are respectively fixedly connected to the abutment plate (235) and the second locking plate (233); an extension rod (236) is horizontally fixedly provided on a side of the second locking plate (233) facing the abutment plate (235); the extension rod (236) passes through an end of the abutment plate (235) and slidably cooperates with the abutment plate (235).

6. The anti-return device for preventing the pipe section from retreating during rectangular pipe jacking construction according to claim 5, characterized in that: An electric push rod (237) is horizontally arranged at one end of the abutment plate (235) away from the second locking plate (233), and the end of the electric push rod (237) is fixedly connected to the end of the abutment plate (235). The electric push rod (237) drives the abutment plate (235) to move in a horizontal direction. When the electromagnet in the clamping block (21) is energized, the output end of the electric push rod (237) extends to the longest state. When the electromagnet is de-energized, the output end of the electric push rod (237) is completely retracted.

7. The anti-return device for preventing the pipe section from retreating during rectangular pipe jacking construction according to claim 4, characterized in that: A guide rail (238) is fixedly arranged on the bracket (3) along the extension direction of the pipe section (1), and the guide rail (238) and the first locking plate (232) are slidably matched along the extension direction of the pipe section (1).

8. The anti-return device for preventing the pipe section from retreating during rectangular pipe jacking construction according to claim 1 is characterized in that: A push-pull unit (24) is arranged on one end of the clamping block (21) away from the pipe joint (1). The push-pull unit (24) comprises a water tank (241) arranged on the side of the clamping block (21) away from the pipe joint (1). The water tank (241) moves in a vertical direction. A support wheel (243) is rotatably arranged on a bracket (3) on the upper part of the water tank (241). A connecting belt (242) is arranged between the water tank (241) and the clamping block (21). Two ends of the connecting belt (242) are respectively fixedly connected to the water tank (241) and the clamping block (21). The connecting belt (242) is wound around the upper part of the support wheel (243) and contacts the support wheel (243). The support wheel (243) and the connecting belt (242) are rollingly matched.

9. The anti-return device for preventing the pipe section from retreating during rectangular pipe jacking construction according to claim 8, characterized in that: A storage box (244) is provided on one side of the water tank (241), and water is stored in the storage box (244). A water supply pipe (245) is provided between the storage box (244) and the water tank (241), and the water tank (241) is connected to the storage box (244) through the water supply pipe (245). A water pump is provided on the water supply pipe (245), and the water pump is used to pump water in the storage box (244) into the water tank (241) or pump water in the water tank (241) into the storage box (244).

10. The anti-return device for preventing the pipe section from retreating during rectangular pipe jacking construction according to claim 1, characterized in that: A second roller (211) is provided on both sides of the clamping block (21), respectively. When the clamping block (21) is clamped and matched with the clamping groove (11), the second roller (211) contacts the side wall of the pipe section (1) on one side of the clamping groove (11), and the axis of the second roller (211) is parallel to the height direction of the bracket (3).

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