A pipe jacking construction device and construction method under sandy and gravelly strata conditions

Abstract

This invention provides a pipe jacking construction device for gravel and pebble strata conditions, comprising steel sheet piles, a retaining wall, U-shaped jacking irons, and auxiliary structures. The inner wall of the steel sheet piles is fixedly connected to the retaining wall, and a base plate is abutted against the inner wall of the steel sheet piles. A backrest is fixedly connected to the upper surface of the base plate, and two jacking cylinders are fixedly connected to the side of the backrest away from the steel sheet piles. Several U-shaped jacking irons are installed on one side of the jacking cylinders, and the sides of the U-shaped jacking irons abut against each other. A pipe jacking structure is set on one side of the U-shaped jacking irons. The pipe jacking structure includes a pipe jacking assembly, a distribution assembly, and a retention assembly. The U-shaped jacking irons abut against a prestressed reinforced concrete pipe with the aid of the pipe jacking assembly. This invention can complete the project construction under gravel and pebble strata conditions without affecting the surface environment and traffic conditions, with low construction costs, long single construction distances, and good overall benefits.

Description

Technical Field

[0001] This invention belongs to the field of pipe jacking construction technology, and particularly relates to a pipe jacking construction device and construction method under sandy and gravel strata conditions. Background Technology

[0002] Pipe jacking equipment consists of sheet piles, retaining walls, a base plate, a backrest, a jacking cylinder, a U-shaped jacking iron, a tool head, a horizontal rail, and a guide rail. It is a device that excavates underground pipelines between two points without damaging the surrounding environment and is commonly used in trenchless engineering.

[0003] In existing technologies, underground pipe jacking construction mainly employs two methods: earth pressure jacking and slurry balance jacking. These methods utilize a tool head to cut the soil at the tunnel face to achieve continuous pipe jacking. However, in complex geological conditions such as sandy and gravelly strata, these methods are prone to causing tunnel face collapse, tool head jamming, or breakage, preventing the pipe jacking equipment from performing effective jacking operations in these strata. Summary of the Invention

[0004] In view of the shortcomings of existing technologies, such as face collapse or tool head jamming and breakage during pipe jacking construction in sandy and gravelly strata, which prevents the pipe jacking equipment from carrying out effective jacking operations in sandy and gravelly strata, this invention proposes a pipe jacking construction device and construction method under sandy and gravelly strata conditions.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A pipe jacking construction device for gravel strata includes sheet piles, retaining walls, U-shaped jacking irons, and auxiliary structures. The inner wall of the sheet piles is fixedly connected to the retaining walls. A base plate is abutted against the inner wall of the sheet piles. A backrest is fixedly connected to the upper surface of the base plate. Two jacking cylinders are fixedly connected to the side of the backrest away from the sheet piles. Several U-shaped jacking irons are installed on one side of the jacking cylinders. The sides of the U-shaped jacking irons that are close to each other abut against each other. A pipe jacking structure is provided on one side of the U-shaped jacking irons. The pipe jacking structure includes a pipe jacking assembly, a distribution assembly, and a retention assembly. The U-shaped jacking irons abut against a prestressed reinforced concrete pipe with the help of the pipe jacking assembly. Two grouting holes are opened on the arc surface of the prestressed reinforced concrete pipe.

[0007] By adopting this preferred scheme and adding a pipe jacking structure, the project can be completed in sandy and gravelly soil without affecting the above-ground buildings and traffic conditions. This results in low demolition costs, long construction distances in a single operation, and good overall benefits.

[0008] Preferably, the jacking pipe assembly includes an annular jacking iron, which is fixedly connected to one side of one of the U-shaped jacking irons. The side of the annular jacking iron away from the U-shaped jacking iron abuts against the prestressed reinforced concrete jacking pipe. A connecting pipe is fixedly connected to the side of the prestressed reinforced concrete jacking pipe that abuts against the annular jacking iron. A butt groove (fitting with the butt joint pipe) is provided on the side of the prestressed reinforced concrete jacking pipe away from the connecting pipe. A collar is fitted on the arc surface of the connecting pipe. Three adjusting screws are threadedly connected to the side of the collar away from the connecting pipe. The three adjusting screws are rotatably connected to a wedge-shaped cutting edge on the side away from the collar. Several wedge-shaped blades with a cutting edge cross-section that is pointed at the front and wide at the back in the jacking direction are fixedly connected to the side of the base plate. A bracket is fixedly connected to the side of the backrest near the jacking cylinder.

[0009] Using this preferred scheme, before installing the pipe jacking equipment, the segmented jacking distance can be reasonably set according to the total length of the underground pipeline. Measurements are taken to determine the locations of each working pit and receiving pit, as well as construction parameters such as jacking orientation, slope, and elevation. Two working pits are excavated in advance, and sheet piles and retaining walls are driven along the excavation line. Then, a backrest is poured on the base slab, followed by the installation of an auxiliary structure. Two jacking cylinders are fixed to the backrest, and U-shaped jacking irons are fixed to the output ends of the two jacking cylinders as needed. A prestressed reinforced concrete pipe is then placed on the auxiliary structure using a crane. Finally, a collar equipped with adjusting screws and wedge-shaped cutting edges is fitted onto the connecting pipe, and the jacking operation is started. The hydraulic cylinder pushes the U-shaped jacking iron, which in turn pushes the annular jacking iron and prestressed reinforced concrete jacking pipe forward. Then, the wedge-shaped cutting edge is activated to cut the sand and gravel in the process. As it slowly advances and cuts into the gravel layer, the gravel in the wedge-shaped cutting edge area is passively squeezed into the prestressed reinforced concrete jacking pipe. When the first prestressed reinforced concrete jacking pipe is squeezed out to a certain extent, the crane can be used again to place another prestressed reinforced concrete jacking pipe on the auxiliary structure and repeat the above operation. This cycle continues until the first prestressed reinforced concrete jacking pipe with the collar passes through the gravel layer and enters another working pit. Then, the prestressed reinforced concrete jacking pipes are removed one by one and transported out of the working pit by the crane.

[0010] Preferably, the amortization component includes two embedding slots, which are formed on the arc surface of the U-shaped top iron. An embedding block abuts against the inner wall of the embedding slot. A support rod is fixedly connected to the upper surface of the embedding block. The support rod is fixedly connected to the annular top iron. An auxiliary rod is fixedly connected to the lower surface of the support rod. The end of the auxiliary rod away from the support rod is fixedly connected to the embedding block. A connecting pipe is fixedly connected to the side of the annular top iron away from the embedding block.

[0011] By adopting this preferred solution, during the process of the jacking cylinder pushing the U-shaped top iron forward, the force applied by the jacking cylinder can be distributed above the annular top iron with the help of the distribution component. In conjunction with the U-shaped top iron, the annular top iron has a larger force-bearing area and the force is more evenly distributed.

[0012] Preferably, the arc surface of the connecting pipe is provided with a groove, and a sealing ring, which is a rubber ring, is fixedly connected to the inner wall of the groove.

[0013] By adopting this preferred solution, a sealing ring can be inserted into a groove at the connection between the prestressed reinforced concrete jacking pipe and the collar, which can improve the sealing performance of the connection.

[0014] Preferably, the retention component includes an arc-shaped plate that abuts against the inner wall of the prestressed reinforced concrete jacking pipe. A baffle is fixedly connected to the side of the arc-shaped plate away from the collar, and the baffle abuts against the inner wall of the prestressed reinforced concrete jacking pipe. With this preferred embodiment, the cut soil and gravel will enter the prestressed reinforced concrete jacking pipe. The retention component effectively prevents the soil and gravel from rolling everywhere, intercepting them at the front end for convenient transportation.

[0015] Preferably, the upper surface of the base plate is provided with a guide structure, which includes a moving component, a guiding component, and a supporting component. The moving component includes two sliding frames, which are fixedly connected to the upper surface of the base plate. A T-shaped plate is slidably connected to the inner wall of each sliding frame. A push plate is fixedly connected to the side of the T-shaped plate away from the prestressed reinforced concrete jacking pipe. Two electric actuators are fixedly connected to the upper surface of the base plate. The output end of each electric actuator is fixedly connected to the push plate at the corresponding position. A locking block is fixedly connected to the side of the sliding frame near the electric actuator, and the locking block is fixedly connected to the electric actuator. A rectangular plate is fixedly connected to the side of the sliding frame away from the electric actuator. A crash barrier is fixedly connected to the side of the plate near the T-shaped plate to limit the movement distance of the T-shaped plate. The push plate is slidably connected to the inner wall of the sliding frame. The guide assembly includes a connecting plate, which is fixedly connected to the upper surface of the T-shaped plate. An auxiliary plate is fixedly connected to the upper surface of the T-shaped plate. A U-shaped frame is fixedly connected to the end of the auxiliary plate and the connecting plate away from the T-shaped plate. A plurality of rotating shafts are rotatably connected to the inner wall of the U-shaped frame. A transmission belt is driven through the arc surfaces of the plurality of rotating shafts. A guide plate for guiding the prestressed reinforced concrete jacking pipe is fixedly connected to the end of the U-shaped frame away from the bottom plate. Two reserved grooves are respectively opened on the arc surface of the prestressed reinforced concrete jacking pipe.

[0016] Using this preferred scheme, after the crane moves the prestressed reinforced concrete jacking pipe to a suitable position, two electric actuators can be activated to push the T-shaped plate forward, causing the U-shaped frame to move towards the prestressed reinforced concrete jacking pipe. Once the pipe reaches the desired position, the actuators stop. Then, the pre-reserved grooves on both sides of the prestressed reinforced concrete jacking pipe are lowered along the corresponding transmission belts. During the lowering process, the friction between the prestressed reinforced concrete jacking pipe and the transmission belts causes the contact points between the transmission belts and the bottom walls of the pre-reserved grooves to move downwards, while the shaft rotates. Once the prestressed reinforced concrete jacking pipe is lowered to contact the auxiliary structure, the electric actuators can be activated again to move the U-shaped frame away from the prestressed reinforced concrete jacking pipe. By setting up a guiding structure, calibration and guidance during the lowering of the prestressed reinforced concrete jacking pipe can be performed more conveniently without manual calibration, allowing the prestressed reinforced concrete jacking pipe to be lowered onto the auxiliary structure more accurately and quickly.

[0017] Preferably, the inner wall of the sliding frame has two rolling grooves, and a plurality of sliding beads are slidably connected to the sliding frame via the sliding grooves. A plurality of sliding beads are slidably connected to the inner wall of the sliding frame. Arc-shaped grooves are respectively provided on the upper surfaces of both sides of the T-shaped plate. The sliding beads are slidably connected to the arc-shaped grooves. The support component includes a connecting frame, and the upper surface of the connecting frame is fixedly connected to the lower surface of the U-shaped frame.

[0018] By adopting this preferred solution, the added sliding ball rotates due to friction during the sliding of the T-shaped plate, thereby reducing the friction between the T-shaped plate and the sliding frame. Adding appropriate lubricant can further improve the lubrication effect.

[0019] Preferably, a support plate is fixedly connected to the side of the connecting frame near the prestressed reinforced concrete jacking pipe, and two support frames are fixedly connected to the side of the support plate away from the prestressed reinforced concrete jacking pipe. A positioning plate is fixedly connected to the end of the support frame near the bottom plate, and the positioning plate abuts against the bottom plate.

[0020] With this preferred design, the support plate is arc-shaped, so when the transmission belt abuts against the bottom wall of the reserved groove, the support plate will also appear directly below the prestressed reinforced concrete jacking pipe. After the prestressed reinforced concrete jacking pipe abuts against the auxiliary structure, it will further limit the prestressed reinforced concrete jacking pipe from both sides.

[0021] Preferably, the auxiliary structure includes an auxiliary component, which includes several horizontal rails. The lower surfaces of the horizontal rails are all fixedly connected to the base plate. The upper surfaces of the horizontal rails are jointly fixedly connected to two guide rails. An installation groove is provided on one corner of the guide rail near the prestressed reinforced concrete jacking pipe. A guide wheel is rotatably connected to the inner wall of the installation groove. A support block for fitting the prestressed reinforced concrete jacking pipe is fixedly connected to the upper surface of the horizontal rails.

[0022] In this preferred scheme, when the U-shaped jacking iron and the annular jacking iron push the prestressed reinforced concrete jacking pipe forward with the help of the jacking cylinder, the guide wheel of the guide rail will reduce the friction between the guide rail and the prestressed reinforced concrete jacking pipe, thereby reducing the pressure of the jacking cylinder. By setting up an auxiliary structure, the pressure of the jacking cylinder can be reduced, thereby increasing the maximum progress of the jacking cylinder in pushing several prestressed reinforced concrete jacking pipes forward, which can delay the grouting operation.

[0023] A pipe jacking construction method under sandy and gravelly strata conditions includes the following steps:

[0024] S1. First, install the U-shaped top iron, then place the annular top iron on the guide rail. Insert the embedding block into the embedding groove of the U-shaped top iron. Then, with the help of a crane, lower the first prestressed reinforced concrete jacking pipe to the front of the annular top iron. Install the collar with the wedge-shaped cutting edge on the connecting pipe, and then start the jacking cylinder to push the jacking pipe structure forward.

[0025] S2. After the first prestressed reinforced concrete jacking pipe is pushed to the limit distance of the jacking cylinder, a new prestressed reinforced concrete jacking pipe needs to be lowered with the help of a crane. At this time, two electric push rods can be started to drive the transmission belt to abut against the reserved groove of the prestressed reinforced concrete jacking pipe. Then, continue to lower the prestressed reinforced concrete jacking pipe until it abuts against the guide rail box support plate. Then, restart the electric push rods to retract the U-shaped frames on both sides.

[0026] S3. During the process of the jacking cylinder pushing the prestressed reinforced concrete jacking pipe forward, the guide wheel rotates due to the frictional force on the surface of the prestressed reinforced concrete jacking pipe, thereby reducing the frictional force between the guide rail and the prestressed reinforced concrete jacking pipe.

[0027] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0028] 1. In this invention, before pipe jacking construction, the segmented jacking distance can be reasonably set according to the total length of the underground pipeline, the lines can be measured and laid out, the positions of each working pit and receiving pit can be determined, as well as the jacking orientation, slope, elevation and other construction parameters. Two working pits are dug in advance, steel sheet piles and retaining walls are driven along the excavation edge line, then the backrest is poured on the base plate, and then the auxiliary structure is laid on the base plate. Two jacking cylinders are fixed on the backrest, and U-shaped jacking irons are fixed on the output ends of the two jacking cylinders as needed. Then, a prestressed reinforced concrete pipe is placed on the auxiliary structure by a crane, and then a collar equipped with adjusting screws and wedge-shaped cutting edges is put on the connecting pipe. The jacking cylinders are started to push the U-shaped jacking irons, and the U-shaped jacking irons are used to push the annular jacking irons and prestressed reinforced concrete pipes forward. The process involves pushing forward and then using a wedge-shaped cutting edge to cut through the sand and gravel. As the cutting slowly penetrates the gravel layer, the gravel in the wedge-shaped cutting edge area is passively squeezed into the prestressed reinforced concrete jacking pipe. Once the first prestressed reinforced concrete jacking pipe has been squeezed out to a certain extent, a crane can be used to place another prestressed reinforced concrete jacking pipe on the auxiliary structure, and the above operation can be repeated. This cycle continues until the first prestressed reinforced concrete jacking pipe with a collar passes through the gravel layer and enters another working pit. Then, the prestressed reinforced concrete jacking pipes are dismantled one by one and transported out of the working pit by a crane. By adding a jacking pipe structure, the project can be completed in gravel layers without affecting the above-ground buildings and traffic conditions. The demolition cost is low, the construction distance is long at one time, and the overall benefits are good.

[0029] 2. In this invention, during the process of the jacking cylinder pushing the U-shaped jacking iron forward, the force applied by the jacking cylinder can be distributed above the annular jacking iron by means of a force-sharing component. This, combined with the U-shaped jacking iron, results in a larger and more uniform force-bearing area on the annular jacking iron. Furthermore, adding a groove at the connection between the prestressed reinforced concrete jacking pipe and the collar to accommodate a sealing ring improves the sealing performance of the connection, allowing the cut soil and gravel to enter the prestressed reinforced concrete jacking pipe. The retention component effectively prevents the soil and gravel from rolling everywhere, intercepting them at the front end for convenient transportation.

[0030] 3. In this invention, after the crane moves the prestressed reinforced concrete jacking pipe to a suitable position, two electric actuators can be activated to push the T-shaped plate forward, causing the U-shaped frame to move towards the prestressed reinforced concrete jacking pipe. Once it reaches the appropriate position, the electric actuators stop. Then, the pre-reserved grooves on both sides of the prestressed reinforced concrete jacking pipe are lowered along the corresponding transmission belts. During the lowering process, the friction between the prestressed reinforced concrete jacking pipe and the transmission belts causes the contact points between the transmission belts and the bottom walls of the pre-reserved grooves to move downwards. Simultaneously, the shaft rotates. When the prestressed reinforced concrete jacking pipe is lowered to a point where it contacts the auxiliary structure, the arc-shaped... When the transmission belt abuts against the bottom wall of the reserved groove, the support plate will also appear directly below the prestressed reinforced concrete jacking pipe. After the prestressed reinforced concrete jacking pipe abuts against the auxiliary structure, it will further limit the prestressed reinforced concrete jacking pipe from both sides. Then, the electric actuator can be started again to move the U-shaped frame away from the prestressed reinforced concrete jacking pipe. By setting the guide structure, calibration and guidance can be carried out more conveniently during the lowering of the prestressed reinforced concrete jacking pipe without the need for manual calibration. This allows the prestressed reinforced concrete jacking pipe to be lowered onto the auxiliary structure more accurately and quickly.

[0031] 4. In this invention, when the U-shaped top iron and the annular top iron push the prestressed reinforced concrete jacking pipe forward with the help of the jacking cylinder, the guide wheel of the guide rail will reduce the friction between the guide rail and the prestressed reinforced concrete jacking pipe, thereby reducing the pressure of the jacking cylinder. By setting an auxiliary structure, the pressure of the jacking cylinder can be reduced, thereby increasing the maximum progress of the jacking cylinder in pushing several prestressed reinforced concrete jacking pipes forward, which can delay the grouting operation. Attached Figure Description

[0032] Figure 1 This is a three-dimensional structural diagram of the pipe jacking construction device of the present invention;

[0033] Figure 2 This is a schematic diagram of the internal structure of the steel sheet pile in the pipe jacking construction device of the present invention;

[0034] Figure 3 The present invention relates to a pipe jacking construction device. Figure 2 Schematic diagram of a partial structure;

[0035] Figure 4 This is a partial structural disassembly diagram of the pipe jacking component of the pipe jacking construction device of the present invention;

[0036] Figure 5 This is a schematic diagram of the internal structure of the prestressed reinforced concrete jacking pipe of the jacking construction device of the present invention;

[0037] Figure 6 This is a partial structural disassembly diagram of the apportionment component of the pipe jacking construction device of the present invention;

[0038] Figure 7 This is a schematic diagram of the disassembly of the guide structure of the pipe jacking construction device of the present invention;

[0039] Figure 8 This is a schematic diagram showing the disassembly of the moving components of the pipe jacking construction device of the present invention;

[0040] Figure 9 This is a schematic diagram of the internal structure of the sliding frame of the pipe jacking construction device of the present invention;

[0041] Figure 10 This is a schematic diagram of the auxiliary structure of the pipe jacking construction device of the present invention;

[0042] Figure 11 for Figure 10 Enlarged view of point A.

[0043] Legend: 1. Sheet pile; 2. Pipe jacking structure; 21. Pipe jacking assembly; 211. Ring jacking iron; 212. Connecting pipe; 213. Butt joint groove; 214. Collar; 215. Adjusting screw; 216. Wedge-shaped cutting edge; 217. Groove; 218. Sealing ring; 219. Bracket; 22. Distributing assembly; 221. Embedded groove; 222. Embedded block; 223. Support rod; 224. Auxiliary rod; 225. Butt joint pipe; 23. Retention assembly; 231. Arc plate; 232. Baffle; 3. Guide structure; 31. Moving assembly; 311. Sliding frame; 312. Rolling groove; 313. Sliding ball; 314. T-shaped plate; 315. Arc groove; 316. Push plate 317. Locking block; 318. Electric actuator; 32. Guide assembly; 321. Connecting plate; 322. Auxiliary plate; 323. U-shaped frame; 324. Rotating shaft; 325. Transmission belt; 326. Guide plate; 327. Rectangular plate; 328. Anti-collision plate; 33. Support assembly; 331. Connecting frame; 332. Support plate; 333. Support frame; 334. Positioning plate; 4. Auxiliary structure; 41. Auxiliary assembly; 411. Horizontal rail; 412. Guide rail; 413. Mounting groove; 414. Guide wheel; 415. Support block; 5. Waist rail; 6. Base plate; 7. Backrest; 8. Jacking cylinder; 9. U-shaped jacking iron; 10. Prestressed reinforced concrete jacking pipe; 11. Grouting hole. Detailed Implementation

[0044] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0045] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0046] Example 1, as Figure 1-11 As shown, the present invention provides a pipe jacking construction device under sandy and gravelly strata conditions, including steel sheet piles 1, retaining walls 5, U-shaped jacking irons 9, and auxiliary structures 4. The inner wall of the steel sheet piles 1 is fixedly connected to the retaining walls 5. The inner wall of the steel sheet piles 1 abuts against a base plate 6. A backrest 7 is fixedly connected to the upper surface of the base plate 6. Two jacking cylinders 8 are fixedly connected to the side of the backrest 7 away from the steel sheet piles 1. Several U-shaped jacking irons 9 are installed on one side of the jacking cylinders 8. The sides of the several U-shaped jacking irons 9 that are close to each other abut against each other. A pipe jacking structure 2 is provided on one side of the U-shaped jacking irons 9. A guide structure 3 is provided on the upper surface of the base plate 6.

[0047] The following section will explain the specific configuration and function of its jacking structure 2, guiding structure 3, and auxiliary structure 4.

[0048] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, the pipe jacking structure 2 includes a pipe jacking assembly 21, a distribution assembly 22, and a retention assembly 23. A U-shaped jacking iron 9 abuts against a prestressed reinforced concrete pipe 10 via the pipe jacking assembly 21. Two grouting holes 11 are opened on the arc surface of the prestressed reinforced concrete pipe 10. The pipe jacking assembly 21 includes an annular jacking iron 211, which is fixedly connected to one side of one of the U-shaped jacking irons 9. The side of the annular jacking iron 211 away from the U-shaped jacking iron 9 abuts against the prestressed reinforced concrete pipe 10. A connecting... Pipe 212, the prestressed reinforced concrete jacking pipe 10 has a butt groove 213 (to mate with the butt joint pipe) on the side away from the connecting pipe 212. The arc surface of the connecting pipe 212 is fitted with a collar 214. The side of the collar 214 away from the connecting pipe 212 is threaded with three adjusting screws 215. The side of the three adjusting screws 215 away from the collar 214 is rotatably connected to a wedge-shaped cutting edge 216. The side of the wedge-shaped cutting edge 216 away from the collar 214 is fixedly connected with several wedge-shaped blades with a cutting edge cross-section that is pointed at the front and wide at the back in the jacking direction. The upper surface of the base plate 6 is fixedly connected with a bracket 219. The bracket 219 and the backrest 7 The distribution assembly 22 includes two embedding slots 221 fixedly connected to the side near the jacking cylinder 8. These slots 221 are formed on the arc surface of the U-shaped jacking iron 9. An embedding block 222 abuts against the inner wall of each embedding slot 221. A support rod 223 is fixedly connected to the upper surface of the embedding block 222 and is fixedly connected to the annular jacking iron 211. An auxiliary rod 224 is fixedly connected to the lower surface of the support rod 223. The end of the auxiliary rod 224 away from the support rod 223 is fixedly connected to the embedding block 222. A connecting pipe 225 is fixedly connected to the side of the annular jacking iron 211 away from the embedding block 222. The arc surface of 12 has a groove 217, and a sealing ring 218 is fixedly connected to the inner wall of the groove 217. The sealing ring 218 is a rubber ring. By adopting this preferred solution, the sealing performance of the connection can be improved by adding a groove 217 to the connection between the prestressed reinforced concrete jacking pipe 10 and the collar 214 and inserting the sealing ring 218. The retention component 23 includes an arc plate 231, which abuts against the inner wall of the prestressed reinforced concrete jacking pipe 10. A baffle 232 is fixedly connected to the side of the arc plate 231 away from the collar 214, and the baffle 232 abuts against the inner wall of the prestressed reinforced concrete jacking pipe 10.

[0049] The overall effect of the pipe jacking structure 2 is that by adding the pipe jacking structure 2, the project can be completed in the sandy and gravelly soil layer without affecting the above-ground buildings and traffic conditions. The demolition cost is small, the construction distance is long at one time, and the overall benefits are good.

[0050] like Figure 1 , Figure 7 , Figure 8 and Figure 9As shown, the guide structure 3 includes a moving component 31, a guide component 32, and a support component 33. The moving component 31 includes two sliding frames 311, which are fixedly connected to the upper surface of the base plate 6. A T-shaped plate 314 is slidably connected to the inner wall of the sliding frame 311. A push plate 316 is fixedly connected to the side of the T-shaped plate 314 away from the prestressed reinforced concrete jacking pipe 10. Two electric actuators 318 are fixedly connected to the upper surface of the base plate 6. The output end of the electric actuator 318 is fixedly connected to the push plate 316 at the corresponding position. A locking block is fixedly connected to the side of the sliding frame 311 near the electric actuator 318. 317, the locking block 317 is fixedly connected to the electric push rod 318, a rectangular plate 327 is fixedly connected to the side of the sliding frame 311 away from the electric push rod 318, a bumper plate 328 is fixedly connected to the side of the rectangular plate 327 near the T-shaped plate 314 to limit the movement distance of the T-shaped plate 314, a push plate 316 is slidably connected to the inner wall of the sliding frame 311, the guide assembly 32 includes a connecting plate 321, the connecting plate 321 is fixedly connected to the upper surface of the T-shaped plate 314, an auxiliary plate 322 is fixedly connected to the upper surface of the T-shaped plate 314, and the auxiliary plate 322 and the connecting plate 321 are located away from the T-shaped plate 314. A U-shaped frame 323 is fixedly connected to the prestressed concrete jacking pipe 10. Several rotating shafts 324 are rotatably connected to the inner wall of the U-shaped frame 323. A transmission belt 325 is connected to the arc surfaces of the rotating shafts 324. A guide plate 326 for guiding the prestressed concrete jacking pipe 10 is fixedly connected to the end of the U-shaped frame 323 away from the base plate 6. Two pre-reserved grooves are respectively opened on the arc surface of the prestressed concrete jacking pipe 10. Two rolling grooves 312 are opened on the inner wall of the sliding frame 311. Several sliding beads 313 are slidably connected to the sliding frame 311 via the sliding grooves. Several sliding beads 313 are slidably connected to the inner wall of the sliding frame 311. 13. Arc grooves 315 are respectively opened on the upper surfaces of both sides of the T-shaped plate 314. The sliding ball 313 is slidably connected to the arc groove 315. The support component 33 includes a connecting frame 331. The upper surface of the connecting frame 331 is fixedly connected to the lower surface of the U-shaped frame 323. A support plate 332 is fixedly connected to the side of the connecting frame 331 near the prestressed reinforced concrete jacking pipe 10. Two support frames 333 are fixedly connected to the side of the support plate 332 away from the prestressed reinforced concrete jacking pipe 10. A positioning plate 334 is fixedly connected to the end of the support frame 333 near the bottom plate 6. The positioning plate 334 abuts against the bottom plate 6.

[0051] The effect of the entire guiding structure 3 is that, by setting the guiding structure 3, it is possible to more conveniently calibrate and guide the prestressed reinforced concrete jacking pipe 10 during the lowering process without the aid of manual calibration, so that the prestressed reinforced concrete jacking pipe 10 can be lowered onto the auxiliary structure 4 more accurately and quickly.

[0052] like Figure 1 , Figure 2 , Figure 10 and Figure 11As shown, the auxiliary structure 4 includes an auxiliary component 41, which includes several horizontal rails 411. The lower surfaces of the horizontal rails 411 are all fixedly connected to the base plate 6. The upper surfaces of the horizontal rails 411 are jointly fixedly connected to two guide rails 412. An installation groove 413 is provided at one corner of the guide rail 412 near the prestressed reinforced concrete jacking pipe 10. A guide wheel 414 is rotatably connected to the inner wall of the installation groove 413. A support block 415 for fitting the prestressed reinforced concrete jacking pipe 10 is fixedly connected to the upper surface of the horizontal rails 411.

[0053] The effect of the entire auxiliary structure 4 is that by setting the auxiliary structure 4, the pressure of the jacking cylinder 8 can be reduced, thereby increasing the maximum progress of the jacking cylinder 8 in pushing several prestressed reinforced concrete jacking pipes 10 forward, and delaying the grouting operation.

[0054] S1. First, install the U-shaped jacking iron 9, then place the annular jacking iron 211 on the guide rail 412. Insert the embedding block 222 into the embedding groove 221 of the U-shaped jacking iron 9. Then, with the help of a crane, lower the first prestressed reinforced concrete jacking pipe 10 to the front of the annular jacking iron 211. Then, install the collar 214 with the wedge-shaped cutting edge 216 on the connecting pipe 212. Then, start the jacking cylinder 8 to push the jacking pipe structure 2 forward.

[0055] S2. After the first prestressed reinforced concrete jacking pipe 10 is pushed to the limit distance of the jacking cylinder 8, a new prestressed reinforced concrete jacking pipe 10 needs to be lowered with the help of a crane. At this time, the two electric push rods 318 can be started to drive the transmission belt 325 to abut against the reserved groove of the prestressed reinforced concrete jacking pipe 10. Then, the prestressed reinforced concrete jacking pipe 10 is lowered until it abuts against the guide rail 412 and the support plate 332. Then, the electric push rods 318 are restarted to retract the U-shaped frames on both sides.

[0056] S3. During the process of pushing the prestressed reinforced concrete jacking pipe 10 forward by the jacking cylinder 8, the guide wheel 414 rotates due to the frictional force on the surface of the prestressed reinforced concrete jacking pipe 10, thereby reducing the frictional force between the guide rail 412 and the prestressed reinforced concrete jacking pipe 10.

[0057] The overall working principle is as follows: Before pipe jacking construction, the jacking distance of each segment can be reasonably set according to the total length of the underground pipeline. Measurements are taken to determine the location of each working pit and receiving pit, as well as the jacking orientation, slope, elevation, and other construction parameters. Two working pits are excavated in advance, and sheet piles 1 and retaining walls 5 are driven along the excavation line. Then, a backrest 7 is poured on the base slab 6, and an auxiliary structure 4 is laid on the base slab 6. Two jacking cylinders 8 are fixed on the backrest 7. U-shaped jacking irons 9 are then fixed to the output ends of the two jacking cylinders 8 as needed. A prestressed reinforced concrete pipe jacking 10 is placed on the auxiliary structure 4 using a crane. A collar 214 equipped with an adjusting screw 215 and a wedge-shaped cutting edge 216 is then fitted onto the connecting pipe 212. The jacking cylinders 8 are then activated to push the U-shaped jacking iron 9, which in turn pushes the annular jacking iron 211 and the prestressed steel pipe jacking pipe along the pipe. The concrete jacking pipe 10 is pushed forward, and then the wedge-shaped cutting edge 216 is activated to cut the sand and gravel in the process. As it slowly advances and cuts into the gravel layer, the gravel in the area of ​​the wedge-shaped cutting edge 216 is passively squeezed into the prestressed reinforced concrete jacking pipe 10. When the first prestressed reinforced concrete jacking pipe 10 is squeezed out to a certain extent, a crane can be used to place another prestressed reinforced concrete jacking pipe 10 on the auxiliary structure 4 and repeat the above operation. This cycle continues until the first prestressed reinforced concrete jacking pipe 10 with the collar 214 passes through the gravel layer and enters another working pit. Then the prestressed reinforced concrete jacking pipes 10 are dismantled one by one and transported out of the working pit by the crane. By adding the jacking pipe structure 2, the project can be completed in the gravel layer without affecting the above-ground buildings and traffic conditions. The demolition cost is small, the construction distance is long at one time, and the overall benefits are good.

[0058] During the process of the jacking cylinder 8 pushing the U-shaped jacking iron 9 forward, the force applied by the jacking cylinder 8 is distributed above the annular jacking iron 211 by the sharing component 22. This, in conjunction with the U-shaped jacking iron 9, increases the force-bearing area of ​​the annular jacking iron 211, resulting in more even force distribution. A groove 217 is added at the connection between the prestressed reinforced concrete jacking pipe 10 and the collar 214 to accommodate the sealing ring 218, improving the sealing performance of the connection. The cut soil and gravel will enter the prestressed reinforced concrete jacking pipe 10. The retention component 23 effectively prevents the soil and gravel from rolling everywhere, intercepting them at the front for convenient transportation.

[0059] After the crane moves the prestressed reinforced concrete jacking pipe 10 to a suitable position, the two electric actuators 318 can be activated to push the T-shaped plate 314 forward, causing the U-shaped frame to move towards the prestressed reinforced concrete jacking pipe 10. Once it reaches the appropriate position, the electric actuators 318 stop. Then, the pre-reserved grooves on both sides of the prestressed reinforced concrete jacking pipe 10 are lowered along with the corresponding transmission belts 325. During the lowering process, the friction between the prestressed reinforced concrete jacking pipe 10 and the transmission belts 325 will cause the points where the transmission belts 325 contact the bottom wall of the pre-reserved grooves to move downwards. Simultaneously, the rotating shaft 324 rotates. When the prestressed reinforced concrete jacking pipe 10 is lowered to abut against the auxiliary structure 4, the arc-shaped support... When the transmission belt 325 abuts against the bottom wall of the reserved groove, the support plate 332 will also appear directly below the prestressed reinforced concrete jacking pipe 10. After the prestressed reinforced concrete jacking pipe 10 abuts against the auxiliary structure 4, it will further limit the prestressed reinforced concrete jacking pipe 10 from both sides. Then, the electric push rod 318 can be started again to move the U-shaped frame 323 away from the prestressed reinforced concrete jacking pipe 10. By setting the guide structure 3, it is more convenient to calibrate and guide the prestressed reinforced concrete jacking pipe 10 during the lowering process without the aid of manual calibration. This allows the prestressed reinforced concrete jacking pipe 10 to fall more accurately and quickly onto the auxiliary structure 4.

[0060] When the U-shaped jacking iron 9 and the annular jacking iron 211 push the prestressed reinforced concrete jacking pipe 10 forward with the help of the jacking cylinder 8, the guide wheel 414 of the guide rail 412 will reduce the friction between the guide rail 412 and the prestressed reinforced concrete jacking pipe 10, thereby reducing the pressure of the jacking cylinder 8. By setting the auxiliary structure 4, the pressure of the jacking cylinder 8 can be reduced, thereby increasing the maximum progress of the jacking cylinder 8 in pushing several prestressed reinforced concrete jacking pipes 10 forward, which can delay the grouting operation.

[0061] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A pipe jacking construction device for sandy and gravelly strata, comprising sheet piles (1), retaining walls (5), U-shaped jacking irons (9), and auxiliary structures (4), characterized in that: The inner wall of the sheet pile (1) is fixedly connected to the purlin (5). The inner wall of the sheet pile (1) abuts against the bottom plate (6). The upper surface of the bottom plate (6) is fixedly connected to the backrest (7). Two jacking cylinders (8) are fixedly connected to the side of the backrest (7) away from the sheet pile (1). Several U-shaped jacking irons (9) are installed on one side of the jacking cylinders (8). The sides of the several U-shaped jacking irons (9) that are close to each other abut against each other. A jacking pipe structure (2) is provided on one side of the U-shaped jacking irons (9). The jacking pipe structure (2) includes a jacking pipe assembly (21), a sharing assembly (22), and a retention assembly (23). The U-shaped jacking irons (9) abut against the prestressed reinforced concrete jacking pipe (10) with the help of the jacking pipe assembly (21). Two grouting holes (11) are opened on the arc surface of the prestressed reinforced concrete jacking pipe (10). The upper surface of the base plate (6) is provided with a guide structure (3), which includes a moving component (31), a guiding component (32), and a supporting component (33). The moving component (31) includes two sliding frames (311), which are fixedly connected to the upper surface of the base plate (6). A T-shaped plate (314) is slidably connected to the inner wall of the sliding frame (311). The side of the T-shaped plate (314) away from the prestressed reinforced concrete jacking pipe (10) is fixedly connected to... A push plate (316) is attached, and two electric push rods (318) are fixedly connected to the upper surface of the base plate (6). The output end of the electric push rod (318) is fixedly connected to the push plate (316) at the corresponding position. A locking block (317) is fixedly connected to the side of the sliding frame (311) near the electric push rod (318). The locking block (317) is fixedly connected to the electric push rod (318). A rectangular plate (327) is fixedly connected to the side of the sliding frame (311) away from the electric push rod (318). 327) A crash plate (328) is fixedly connected to one side of the T-shaped plate (314) to limit the movement distance of the T-shaped plate (314). The push plate (316) is slidably connected to the inner wall of the sliding frame (311). The guide assembly (32) includes a connecting plate (321), which is fixedly connected to the upper surface of the T-shaped plate (314). An auxiliary plate (322) is fixedly connected to the upper surface of the T-shaped plate (314). The auxiliary plate (322) and the connecting plate (321) are far apart. A U-shaped frame (323) is fixedly connected to one end of the T-shaped plate (314). Several rotating shafts (324) are rotatably connected to the inner wall of the U-shaped frame (323). A transmission belt (325) is connected to the arc surface of the several rotating shafts (324). A guide plate (326) for guiding the prestressed reinforced concrete jacking pipe (10) is fixedly connected to one end of the U-shaped frame (323) away from the bottom plate (6). Two reserved grooves are respectively opened on the arc surface of the prestressed reinforced concrete jacking pipe (10).

2. The pipe jacking construction device under gravel strata conditions according to claim 1, characterized in that: The jacking pipe assembly (21) includes an annular jacking iron (211), which is fixedly connected to one side of one of the U-shaped jacking irons (9). The side of the annular jacking iron (211) away from the U-shaped jacking iron (9) abuts against the prestressed reinforced concrete jacking pipe (10). A connecting pipe (212) is fixedly connected to the side of the prestressed reinforced concrete jacking pipe (10) that abuts against the annular jacking iron (211). A butt groove (213) is provided on the side of the prestressed reinforced concrete jacking pipe (10) away from the connecting pipe (212). The circular shape of the connecting pipe (212) is... A collar (214) is fitted on the arc surface. Three adjusting screws (215) are threaded to the side of the collar (214) away from the connecting pipe (212). The three adjusting screws (215) are rotatably connected to a wedge-shaped cutting edge (216) on the side away from the collar (214). Several wedge-shaped blades with a cutting edge cross-section that is pointed at the front and wide at the back in the pushing direction are fixedly connected to the side of the wedge-shaped cutting edge (216) away from the collar (214). A bracket (219) is fixedly connected to the upper surface of the base plate (6). The bracket (219) is fixedly connected to the side of the backrest (7) near the pushing cylinder (8).

3. The pipe jacking construction device under gravel strata conditions according to claim 2, characterized in that: The sharing component (22) includes two embedding slots (221), which are formed on the arc surface of the U-shaped top iron (9). The inner wall of the embedding slot (221) abuts against an embedding block (222). A support rod (223) is fixedly connected to the upper surface of the embedding block (222). The support rod (223) is fixedly connected to the annular top iron (211). An auxiliary rod (224) is fixedly connected to the lower surface of the support rod (223). The end of the auxiliary rod (224) away from the support rod (223) is fixedly connected to the embedding block (222). A connecting pipe (225) is fixedly connected to the side of the annular top iron (211) away from the embedding block (222).

4. A pipe jacking construction device for gravel strata conditions according to claim 2, characterized in that: The connecting pipe (212) has a groove (217) on its arc surface, and a sealing ring (218) is fixedly connected to the inner wall of the groove (217). The sealing ring (218) is a rubber ring.

5. A pipe jacking construction device for gravel strata conditions according to claim 1, characterized in that: The retention component (23) includes an arc plate (231) that abuts against the inner wall of the prestressed reinforced concrete jacking pipe (10). A baffle (232) is fixedly connected to the side of the arc plate (231) away from the collar (214), and the baffle (232) abuts against the inner wall of the prestressed reinforced concrete jacking pipe (10).

6. A pipe jacking construction device for gravel strata conditions according to claim 2, characterized in that: The inner wall of the sliding frame (311) has two rolling grooves (312). The sliding frame (311) is slidably connected to a number of sliding beads (313) via the sliding grooves. The inner wall of the sliding frame (311) is slidably connected to a number of sliding beads (313). The upper surfaces of both sides of the T-shaped plate (314) are respectively provided with arc grooves (315). The sliding beads (313) are slidably connected to the arc grooves (315). The support component (33) includes a connecting frame (331). The upper surface of the connecting frame (331) is fixedly connected to the lower surface of the U-shaped frame (323).

7. A pipe jacking construction device for gravel strata conditions according to claim 6, characterized in that: The connecting frame (331) is fixedly connected to a support plate (332) on the side near the prestressed reinforced concrete jacking pipe (10). The support plate (332) is fixedly connected to two support frames (333) on the side away from the prestressed reinforced concrete jacking pipe (10). The support frame (333) is fixedly connected to a positioning plate (334) at the end near the bottom plate (6). The positioning plate (334) abuts against the bottom plate (6).

8. A pipe jacking construction device for gravel strata conditions according to claim 7, characterized in that: The auxiliary structure (4) includes an auxiliary component (41), which includes several horizontal rails (411). The lower surfaces of the several horizontal rails (411) are fixedly connected to the base plate (6). The upper surfaces of the several horizontal rails (411) are fixedly connected to two guide rails (412). The guide rails (412) have an installation groove (413) at one corner near the prestressed reinforced concrete jacking pipe (10). The inner wall of the installation groove (413) is rotatably connected to a guide wheel (414). The upper surface of the horizontal rails (411) is fixedly connected to a support block (415) for fitting the prestressed reinforced concrete jacking pipe (10).

9. A method for pipe jacking construction under sandy and gravelly strata conditions, characterized in that: S1. First, install the U-shaped top iron (9) and then place the ring top iron (211) on the guide rail (412). Insert the embedding block (222) into the embedding groove (221) of the U-shaped top iron (9). Then, with the help of the crane, lower the first prestressed reinforced concrete jacking pipe (10) to the front of the ring top iron (211). Then, install the collar (214) with the wedge-shaped cutting edge (216) on the connecting pipe (212). Then, start the jacking cylinder (8) to push the jacking pipe structure (2) forward. S2. After the first prestressed reinforced concrete jacking pipe (10) is pushed to the limit distance of the jacking cylinder (8), a new prestressed reinforced concrete jacking pipe (10) needs to be lowered with the help of a crane. At this time, two electric push rods (318) can be started to drive the transmission belt (325) to abut against the reserved groove of the prestressed reinforced concrete jacking pipe (10). Then continue to lower the prestressed reinforced concrete jacking pipe (10) until it abuts against the guide rail (412) and the support plate (332). Then restart the electric push rods (318) to retract the U-shaped frames on both sides. S3. During the process of the jacking cylinder (8) pushing the prestressed reinforced concrete jacking pipe (10) forward, the guide wheel (414) is affected by the friction of the surface of the prestressed reinforced concrete jacking pipe (10) and rotates, reducing the friction between the guide rail (412) and the prestressed reinforced concrete jacking pipe (10).

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