A pebble digging structure for pipe jacking construction and a non-excavation pebble digging process

Abstract

The application relates to a pebble extracting structure for pipe jacking construction and a non-excavation pebble extracting process, and relates to the technical field of underground engineering construction. The pebble extracting structure comprises a grabbing cage and a vibrating member for providing vibration power for the grabbing cage. The grabbing cage comprises a frame body and a plurality of supporting rods which are vertically and fixedly connected to the frame body. The frame body is connected with the vibrating member. The ends, away from the frame body, of the supporting rods located on opposite sides of the frame body are rotationally connected with overlapping rods. Any overlapping rod can be opened and closed under the action of gravity of a sand layer. A limiting assembly for limiting the opening and closing of the overlapping rods is arranged on the grabbing cage. A sand leakage gap for extracting pebbles is formed between adjacent overlapping rods. The structure can efficiently remove large-diameter pebbles under non-excavation conditions, and can improve the continuity and construction efficiency of pipe jacking construction in a sand and pebble stratum.

Description

Technical Field

[0001] This application relates to the field of underground engineering construction technology, and in particular to a pebble removal structure and a trenchless pebble removal process for pipe jacking construction. Background Technology

[0002] In trenchless pipe jacking projects in sandy geology in Hainan, the strata are predominantly medium and coarse sand, with large-diameter pebbles unevenly interspersed. The conventional pipe jacking machines used in current projects primarily rely on a front-end tool pipe for forward excavation. The tool pipe is equipped with a closed-type flat cutterhead, with a central cutter located at its center. Cutting tools and fixed-size inlet channels are evenly distributed across the cutterhead surface. During construction, a power mechanism inside the tool pipe drives the cutterhead to rotate and cut the soil in front. The excavated material enters a soil chamber inside the tool pipe through the inlet channels on the cutterhead. The soil chamber contains two water injection pipes connected to the main water pipe inside the tool pipe, which dilute the excavated material into slurry. This slurry is then pumped to the surface via a slurry pump and pipelines, enabling continuous excavation.

[0003] During actual tunneling operations, large pebbles with a diameter of 6cm or more are prone to accumulating and becoming stuck at the front end of the cutterhead, causing cutterhead jamming and machine shutdowns, severely impacting the continuity and efficiency of pipe jacking construction. To address this challenge in gravel strata, the current industry standard is to use surface excavation and support, manually removing the accumulated pebbles, or employ rotary drilling rigs and hammer excavators for pile foundation engineering to ensure the smooth progress of subsequent pipe jacking construction.

[0004] However, in actual construction, the ground excavation and support method for clearing pebbles requires additional steps such as excavation, support, backfilling and compaction, which makes the construction process complicated and significantly extends the construction period. At the same time, it will damage the original underlying structure, which violates the core purpose of trenchless construction. On the other hand, the use of large rotary drilling rigs and hammer-driven obstacle clearing machines requires high road and site conditions, and the applicable construction scenarios are limited and have significant limitations. Summary of the Invention

[0005] To improve the continuity of pipe jacking construction in gravel strata and reduce the impact of large-diameter pebbles jamming the cutterhead on construction efficiency, this application provides a pebble removal structure and a trenchless pebble removal process for pipe jacking construction.

[0006] Firstly, this application provides a pebble removal structure for pipe jacking construction, which adopts the following technical solution: A pebble removal structure for pipe jacking construction includes a grab cage and a vibrating element for providing vibration force to the grab cage. The grab cage includes a frame and a plurality of support rods vertically fixed to the frame. The frame is connected to the vibrating element. The support rods located on opposite sides of the frame are rotatably connected to overlapping rods at their ends away from the frame. Each overlapping rod can rotate open and close under the gravity of the sand layer. The grab cage is provided with a limiting component for restricting the opening and closing of the overlapping rods, and a sand leakage gap is formed between adjacent overlapping rods for removing pebbles.

[0007] By adopting the above technical solution, the vibrating component provides vibration force to the grab cage, facilitating its passage through the sand layer to the construction location where pebbles are abundant. The end of the grab cage's support rod is rotatably connected to the overlapping rod. When the grab cage is pulled upwards, the overlapping rod will rotate and open under the gravity of the sand layer. At this time, the limiting component can constrain the opening and closing angle of the overlapping rod, forming a closed cage structure that traps the sand and pebbles. During continuous lifting, fine sand particles can be naturally filtered out from the gaps between adjacent overlapping rods, while larger pebbles are trapped inside the grab cage. After the grab cage is lifted outside the construction area, the limiting component's restriction on the rotation of the overlapping rod is released, allowing the overlapping rod to continue rotating until it is fully open during subsequent lifting, thus unloading the trapped pebbles into the upper layer of sand in the construction area. This structure can efficiently remove large-diameter pebbles under non-excavation conditions, ensuring the continuous advancement of pipe jacking construction in sandy and gravelly strata and reducing the adverse effects of large-diameter pebbles jamming the cutterhead on construction efficiency.

[0008] Preferably, the limiting component includes an inner rod, an outer sleeve, and a crossbar, with the outer sleeve fitted over the outer side of the inner rod. One end of the outer sleeve is fixedly connected to the vibrating element, and the frame is fixedly connected to the outer sleeve. The end of the inner rod away from the vibrating element extends out of the outer sleeve and is fixedly connected to the crossbar. Each of the overlapping rods can be rotated open to form an overlapping engagement with the crossbar. An avoidance groove is provided at the end of the outer sleeve near the vibrating element, and a drive handwheel fixedly connected to the inner rod is provided in the avoidance groove. The inner rod drives the crossbar to rotate, which can release the overlapping engagement between the crossbar and the overlapping rod.

[0009] By adopting the above technical solution, the limiting component consists of an inner rod, an outer sleeve, a crossbar, and a drive handwheel. The outer sleeve is fixed to the vibrating component and the frame, and can transmit vibration synchronously with the vibrating component, allowing the entire structure to vibrate in unison and penetrate deep into the sand layer. When the grab cage is lifted, each overlapping rod can rotate under the gravity of the sand layer and overlap with the crossbar to form a closed cage structure to grab the pebbles. After the grab cage is lifted outside the construction area, rotating the drive handwheel in the clearance groove can drive the inner rod and the crossbar to rotate, so that the crossbar changes from an intersecting state with the overlapping rod to a parallel state, thereby quickly releasing the overlap between the crossbar and the overlapping rod. After the overlapping rod is unrestrained, it can be fully opened during the continued lifting process, thereby unloading the pebbles into the upper layer of sand in the construction area. This structure is simple to operate, has reliable limiting, and is easy to unlock. It can stably complete the grabbing and unloading of underground pebbles, improve the automation and controllability of non-excavation pebble clearing operations, and ensure the efficient and orderly stone clearing process.

[0010] Preferably, the inner wall of the clearance groove is provided with a protective pad for protecting the drive handwheel.

[0011] By adopting the above technical solution, a protective pad is added to the inner wall of the avoidance groove, which can effectively buffer and absorb the impact force generated by the repeated collision between the drive handwheel and the groove wall due to the high-frequency vibration of the outer sleeve. This avoids deformation, wear or breakage of the drive handwheel due to metal impact, improves the structural integrity and operational reliability of the limiting components under long-term, strong vibration conditions, reduces equipment failure and maintenance time, and ensures continuous operation of pebble removal.

[0012] Preferably, a diagonal brace is fixedly connected between the outer sleeve and the frame, and multiple diagonal braces are arranged along the circumference of the frame.

[0013] By adopting the above technical solution, multiple diagonal braces are evenly distributed circumferentially between the outer sleeve and the frame, forming a stable triangular support structure. This significantly enhances the connection stiffness and overall torsional resistance between the outer sleeve and the grab cage frame. During the vibration penetration into the gravel layer and the lifting process, the diagonal braces can effectively disperse the bending moment caused by lateral soil compression and uneven gravel impact, preventing the frame or support rods from tilting or shrinking. This ensures that the overlapping rods can accurately overlap with the crossbars to form a closed cage, improving the structural stability of repeated operations in complex strata.

[0014] Preferably, each of the support rods has a first penetration tip at the end furthest from the frame.

[0015] By adopting the above technical solution, a first penetration tip is set at the end of the support rod, which can significantly reduce the soil penetration resistance when the grab cage enters the sand layer. Under vibration, the first penetration tip can quickly penetrate and break through the obstruction of dense sand layer and scattered pebbles, allowing the support rod to smoothly penetrate into the underground pebble-rich area, reducing the power consumption and structural wear of the equipment during the penetration process, and improving the efficiency of the equipment penetrating into the sand layer.

[0016] Preferably, the crossbar has a plurality of second penetration tips along its axial direction.

[0017] By adopting the above technical solution, multiple second penetration tips are set in the axial direction of the crossbar, which can effectively reduce the resistance of the crossbar passing through the sand layer; when the crossbar sinks together with the equipment, the second penetration tips can pre-break the sand layer and accumulated pebbles in front, preventing the crossbar from deforming or shifting after being squeezed by the sand and soil, and ensuring the crossbar is accurately positioned and the overlapping structure is stable.

[0018] Preferably, a first nozzle is provided in any of the first penetration tips, a water supply cavity is provided on the side wall of the outer sleeve, a first water supply pipe is provided on the outer sleeve and connected to the water supply cavity, and a first solenoid valve is provided on the first water supply pipe. The frame and any of the support rods are both configured as interconnected cavity structures. The cavity inside the frame is connected to the water supply cavity, and any of the first nozzles is connected to the cavity inside the corresponding support rod.

[0019] By adopting the above technical solution, a connecting cavity is set between the support rod and the inside of the frame. With the water supply cavity, the first water supply pipe and the first solenoid valve on the outer sleeve, controllable water spraying can be achieved at the first nozzle inside the first penetration tip. When the first solenoid valve is opened during construction, high-pressure water can be sprayed into the sand layer through the first nozzle to soften the dense sand and disperse the locally accumulated pebbles, further reducing the resistance during the equipment penetration process.

[0020] Preferably, a second nozzle is provided inside any of the second penetration tips, the inner rod and the crossbar are configured with interconnected cavity structures, a second water supply pipe is provided on the drive handwheel and connected to the cavity inside the inner rod, and a second solenoid valve is provided on the second water supply pipe, a groove for avoiding the second water supply pipe is provided on the inner wall of the clearance groove, and any of the second nozzles is connected to the cavity inside the crossbar.

[0021] By adopting the above technical solution, a connecting cavity is set inside the inner rod and the crossbar. With the help of the second water supply pipe, the second solenoid valve, and the second nozzle inside the second penetration tip, the crossbar area can be independently and controllably sprayed with water for flushing. When the second solenoid valve is opened during construction, high-pressure water can be sprayed into the dense sand layer in front of the crossbar through the second nozzle, reducing the sand resistance encountered by the crossbar during the sinking process. At the same time, in conjunction with the synchronous operation of the first nozzle, the sinking and penetration speed of the entire grab cage can be further accelerated, and the efficiency of the pebble removal operation can be improved.

[0022] Secondly, this application provides a non-excavation gravel removal process, which adopts the following technical solution: A non-excavation cobblestone removal process includes the following steps: S1. Construction Pre-treatment: Determine the location of underground gravel accumulation in the pipe jacking construction area, hoist the gravel removal structure into place, connect to the external high-pressure water supply equipment, complete the pipeline connection of the first water supply pipe and the second water supply pipe, and check the operating status of the first solenoid valve, the second solenoid valve, the vibrating component and the drive handwheel to ensure that all components are operating normally and the pipeline is sealed properly. S2, Vibration and Water Jet Penetration: The vibrating component is activated to drive the entire grab cage to vibrate at high frequency, breaking through the sand layer in front through the first and second penetration tips; the first and second solenoid valves are opened simultaneously, and high-pressure water jets are sprayed through the first and second nozzles to soften the dense sand layer in front and disperse the accumulated pebbles, so that the grab cage can be smoothly penetrated to the target construction depth where underground pebbles are concentrated; after reaching the target depth, the first and second solenoid valves are closed and the water jetting operation is stopped. S3. Lifting and Sand-Filtering: The grab cage is lifted upwards at a uniform speed. The overlapping rods at the ends of the support rods rotate downwards under the gravity of the sand layer and merge with the crossbar to form an overlap limit, so that the grab cage forms a closed cage structure to collect the underground mixture of pebbles and sand. During the continuous lifting process, fine sand particles are naturally filtered out through the sand leakage gaps between adjacent overlapping rods, while large-diameter pebbles larger than the sand leakage gaps are trapped inside the grab cage. Finally, the grab cage with pebbles is lifted as a whole to a safe position above the construction area. S4. Unloading and Structure Reset: Drive the inner rod and crossbar to rotate using the drive handwheel in the clearance groove, releasing the overlap limit between the crossbar and the overlapping rod; continue to lift the grab cage to fully open the overlapping rod, unloading the intercepted pebbles into the upper layer of sand in the construction area; after unloading, reverse the drive handwheel to reset the crossbar and manually retract the overlapping rod; then repeat steps S2 to S4 until the large-diameter pebbles in the underground construction area are cleared.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. This structure uses a vibrating component to drive the grab cage through the sand layer to reach the pebble-rich area. When lifted, the overlapping rods automatically rotate and unfold under the gravity of the sand layer, forming a closed cage with the restraining components. This catches up the pebbles and sand together. Fine sand particles are naturally filtered out through the gaps between the overlapping rods, while large-diameter pebbles are trapped inside the cage. After being lifted outside the construction area, the restraining components are released to allow the overlapping rods to fully open for unloading at a fixed point. The entire process does not require additional procedures such as ground excavation, support, and backfilling, avoiding damage to the original ground structure. It truly retains the core advantages of trenchless construction, significantly shortens the construction period, and enables continuous and efficient pipe jacking construction in sand and gravel strata. 2. The limiting component adopts a cooperative structure of inner rod, outer sleeve, and crossbar. When the grab cage is lifted, each overlapping rod automatically overlaps and locks with the crossbar to form a stable grab cage. When unloading, simply rotate the drive handwheel in the clearance groove to rotate the crossbar out of the overlapping state, which can quickly release the constraint and allow the overlapping rod to fully open and unload the pebbles. The operation is simple and the limiting is reliable. At the same time, the protective pad set in the clearance groove can effectively buffer the impact of high-frequency vibration of the outer sleeve on the drive handwheel, avoid deformation or damage of parts, and thus ensure that the limiting component always functions well during long-term, high-vibration construction, realizing the automation and safe control of pebble removal operations. 3. The first penetration tip at the end of the support rod and the second penetration tip on the crossbar can quickly break through the dense sand layer under vibration, reducing the resistance to soil entry and passage; at the same time, the controllable high-pressure water spray from the first and second nozzles can pre-soften the sand and disperse the locally accumulated pebbles, further reducing the difficulty of penetration, significantly accelerating the sinking speed of the grab cage, and improving the adaptability and operating efficiency of the equipment in complex sand and gravel strata. Attached Figure Description

[0024] Figure 1 This is an isometric schematic diagram of the main overall structure in the embodiments of this application; Figure 2 This is a partial isometric schematic diagram of the main limiting component structure in the embodiments of this application; Figure 3 yes Figure 2 The enlarged view at point A mainly shows the structure of the boss and the handwheel; Figure 4 This is a partial isometric schematic diagram of the main embodiment of the grabbing cage in the closed state in this application; Figure 5 This is a partial cross-sectional view of the water supply cavity structure, which is the main feature of this application embodiment; Figure 6 This is a partial cross-sectional view of the first nozzle structure, which is the main feature of this application embodiment; Figure 7 This is a partial cross-sectional view of the second nozzle structure, which is the main feature of this application embodiment; Figure 8 This is a schematic diagram of a non-excavation pebble removal process provided in the embodiments of this application.

[0025] Reference numerals: 1. Grabbing cage; 11. Frame; 111. Diagonal brace; 12. Support rod; 121. Overlapping rod; 1211. Sand leakage gap; 122. First penetration tip; 1221. First nozzle; 2. Vibrating component; 3. Limiting assembly; 31. Inner rod; 32. Outer sleeve; 321. Boss; 3211. Clearance groove; 3212. Protective pad; 3213. Groove; 322. Water supply chamber; 323. First water supply pipe; 3231. First solenoid valve; 33. Crossbar; 331. Second penetration tip; 3311. Second nozzle; 4. Drive handwheel; 41. Second water supply pipe; 411. Second solenoid valve. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1 -Appendix Figure 8 This application will be described in further detail.

[0027] In one aspect, embodiments of this application disclose a pebble removal structure for pipe jacking construction.

[0028] Reference Figure 1 and Figure 2 A pebble retrieval structure for pipe jacking construction includes a grab cage 1 and a vibrator 2 for providing vibration force to the grab cage 1. In this embodiment, the vibrator 2 is a hydraulic breaker. The grab cage 1 includes a rectangular frame 11 and multiple support rods 12 vertically fixed to the frame 11 by welding. In this embodiment, the distance between any two adjacent support rods 12 is 6 cm, and the frame 11 is connected to the output shaft of the vibrator 2. The ends of the support rods 12 located on both sides of the short side of the frame 11 away from the frame 11 are rotatably connected to overlapping rods 121 by hinges. Any overlapping rod 121 can rotate open and close under the gravity of the sand layer. In this embodiment, rotational damping is provided at the rotational connection between any support rod 12 and overlapping rod 121. The grab cage 1 is provided with a limiting component 3 for limiting the opening and closing of the overlapping rods 121, and a sand leakage gap 1211 for retrieval of pebbles is formed between adjacent overlapping rods 121.

[0029] In practical use, the vibrating component 2 (hydraulic breaker) is first activated to drive the grab cage 1 to vibrate at high frequency. This allows the grab cage 1 to gradually penetrate the sand layer through the combined action of its own weight and the vibration force, until it reaches the target depth for pebble accumulation. Then, the grab cage 1 is lifted upwards. The overlapping rod 121 rotates downwards around the hinge and unfolds under the weight of the sand layer, while the limiting component 3 constrains its opening angle, forming a closed cage structure that traps the sand and pebbles. During continuous lifting, fine sand particles are naturally filtered out through the sand-leaking gaps 1211 between adjacent overlapping rods 121, while pebbles larger than 6 cm in diameter are effectively trapped inside the grab cage 1. When the grab cage 1 is lifted to the top of the construction area... Once in a safe position, the operator can release the rotation restriction of the overlapping rod 121 by the limiting component 3, allowing the overlapping rod 121 to continue rotating outward under the gravity of the sand layer until it is fully opened, unloading the pebbles into the upper layer of sand in the construction area. This completes one trenchless pebble removal operation. The entire process does not require damage to the ground structure, significantly improving the continuity and efficiency of pipe jacking construction in sand and gravel strata. In particular, the rotation damping effectively ensures that the overlapping rod 121 maintains a stable retracted posture when not in use, preventing structural interference or accidental opening due to shaking during transportation, lowering, or non-operation phases. This ensures that the overlapping rod 121 is only opened in a controlled manner during the lifting process, further improving operational reliability.

[0030] Reference Figures 2-4 The limiting component 3 includes an inner rod 31, an outer sleeve 32, and a crossbar 33. The outer sleeve 32 is fitted outside the inner rod 31, and one end of the outer sleeve 32 is fixedly connected to the output shaft of the vibrating element 2 by welding. A diagonal brace 111 is fixedly connected to the outer sleeve 32 and the frame 11 by welding, and multiple diagonal braces 111 are arranged along the circumference of the frame 11. In this embodiment, four diagonal braces 111 are arranged in total, and the ends of the four diagonal braces 111 away from the outer sleeve 32 are respectively fixedly connected to the four corners of the rectangular frame 11. The end of the inner rod 31 away from the vibrating element 2 extends out of the outer sleeve 32 and is fixedly connected to the crossbar 33 by welding. Each overlapping rod 121 can form an overlapping fit with the crossbar 33 after being rotated open. The outer sleeve 32 has a relief groove 3211 at one end near the vibrating element 2. In this embodiment, the outer sleeve 32 has a boss 321 integrally formed at one end near the vibrating element 2, and the relief groove 3211 is formed on the boss 321. A drive handwheel 4 is provided in the relief groove 3211 and is fixedly connected to the inner rod 31 by welding. The inner rod 31 drives the crossbar 33 to rotate, which can release the overlap between the crossbar 33 and the overlapping rod 121. A protective pad 3212 for protecting the drive handwheel 4 is fixedly connected to the inner wall of the relief groove 3211 by adhesive. In this embodiment, the protective pad 3212 is made of rubber material. There are two protective pads 3212, which are located on the upper and lower sides of the drive handwheel 4 respectively.

[0031] In practical use, the outer sleeve 32 is fixedly connected to the vibrating element 2 and the frame 11 respectively, which can synchronously transmit the vibration force generated by the vibrating element 2 to the entire grab cage 1, ensuring that the grab cage 1 maintains overall coordinated vibration during the penetration process, effectively overcoming the compaction resistance of the sand and gravel strata; at the same time, the outer sleeve 32 and the frame 11 form a stable triangular support structure through four diagonal braces 111, which can effectively resist lateral sand pressure and gravel impact during vibration penetration and lifting, prevent the frame 11 from twisting or the support rod 12 from retracting, and ensure that the overlapping rod 121 can accurately overlap the crossbar 33 to achieve reliable locking when lifted; the clearance groove 3211 on the boss 321 provides an independent installation space for the drive handwheel 4, avoiding interference between it and the main body of the outer sleeve 32 during vibration; the rubber protective pads 3212 are arranged on the upper and lower sides of the drive handwheel 4, which can absorb impact energy when the equipment vibrates at high frequency, preventing wear or structural failure caused by direct collision of metal parts; When the grab cage 1 is lowered and begins to be lifted, the overlapping rod 121 naturally swings down under the gravity of the sand layer and overlaps with the crossbar 33 in the limiting component 3, forming a closed cage structure to collect pebbles. As the lifting height increases, fine sand is continuously discharged from the sand leakage gap 1211 with a spacing of 6 cm, while large-diameter pebbles larger than this gap remain stably inside the grab cage 1. After the entire structure is lifted outside the construction area, the operator only needs to manually rotate the drive handwheel 4 about 90 degrees to drive the inner rod 31 and the crossbar. 33 rotates synchronously, changing its position from an intersecting state with the overlapping rod 121 to a parallel state, thereby releasing the mechanical limit on the overlapping rod 121; then, during the continued lifting process, the overlapping rod 121 will fully open under its own weight and the disturbance of residual sand, thus unloading the intercepted pebbles into the upper layer of sand in the construction area; this structure is simple to operate, has reliable limit, and is easy to unlock, and can stably complete the grabbing and fixed-point unloading of underground pebbles, improve the automation and controllability of non-excavation pebble clearing operations, and ensure that the stone clearing process is efficient and orderly.

[0032] Reference Figure 2 Each support rod 12 has a first penetration tip 122 integrally formed at one end away from the frame 11, and multiple second penetration tips 331 are integrally formed at intervals along the axial direction of the crossbar 33. In actual use, the first penetration tip 122 and the second penetration tip 331 work together under the drive of the vibrating element 2 to quickly break through the sand layer and accumulated pebbles in front, significantly reducing the front resistance of the grab cage 1 and the crossbar 33 when sinking, so that the structure can smoothly reach the pebble-rich area, reduce the power consumption and structural wear during the equipment penetration process, and improve the efficiency of the equipment to penetrate into the sand layer.

[0033] Reference Figures 2-6A first nozzle 1221 is embedded in any of the first penetration tips 122. An annular water supply cavity 322 is integrally formed on the side wall of the outer sleeve 32. A first water supply pipe 323 connected to the water supply cavity 322 is fixedly installed on the outer wall of the outer sleeve 32, and a first solenoid valve 3231 is connected in series with the first water supply pipe 323. The frame 11, any of the diagonal braces 111, and the support rod 12 are all configured as interconnected cavity structures. The cavity inside the frame 11 is connected to the water supply cavity 322 through the diagonal braces 111, and any of the first nozzles 1221 is connected to the cavity inside the corresponding support rod 12. A second nozzle 3311 is embedded in any of the second penetration tips 331. The inner rod 31 and the cross rod 33 The internal structure is configured with interconnected cavities. The drive handwheel 4 is provided with a second water supply pipe 41 that communicates with the cavity inside the inner rod 31, and a second solenoid valve 411 is connected in series on the second water supply pipe 41. In this embodiment, a water inlet that communicates with the cavity inside the inner rod 31 is opened through the center of the drive handwheel 4, and the end of the second water supply pipe 41 is fixedly installed at the water inlet. A groove 3213 for avoiding the second water supply pipe 41 is integrally formed on the inner wall of the clearance groove 3211. Any second nozzle 3311 is connected to the cavity inside the crossbar 33. In addition, this embodiment also includes a remote controller, and the first solenoid valve 3231 and the second solenoid valve 411 are both electrically connected to the remote controller.

[0034] In actual use, when lowering the grab cage 1, the operator can simultaneously open the first solenoid valve 3231 and the second solenoid valve 411 via a remote controller. This allows high-pressure water from the first water supply pipe 323 to flow through the first water supply pipe 323, the water supply chamber 322, the cavity of the diagonal brace 111, the cavity of the frame 11, and the cavity of the support rod 12, delivering it to the first nozzle 1221. Simultaneously, high-pressure water from the second water supply pipe 41 flows through the second water supply pipe 41, the cavity of the inner rod 31, and the cavity of the cross rod 33, delivering it to the second nozzle 3311. The first nozzle 1221 then... The front end of rod 12 sprays water into the surrounding sand layer, softening the dense sand and dispersing locally accumulated pebbles. The second nozzle 3311 simultaneously flushes the path in front of the crossbar 33, effectively reducing the overall structural sinking resistance. This enables the grab cage 1 and crossbar 33 to penetrate quickly and smoothly into complex sand and pebble strata, improving the overall efficiency of pebble removal operations. After the lowering is completed, the operator can again use the remote controller to simultaneously close the first solenoid valve 3231 and the second solenoid valve 411 to stop the water supply and avoid unnecessary disturbance to the penetrated area.

[0035] Secondly, embodiments of this application disclose a non-excavation process for removing pebbles. (Refer to...) Figure 8 It includes the following steps: S1. Construction Pre-treatment: Determine the location of underground gravel accumulation in the pipe jacking construction area, and the operators hoist the gravel removal structure into place, connect it to the external high-pressure water supply equipment, complete the pipeline connection of the first water supply pipe 323 and the second water supply pipe 41, and check the operating status of the first solenoid valve 3231, the second solenoid valve 411, the vibrating component 2 and the drive handwheel 4 to ensure that all components are operating normally and the pipeline is sealed properly. S2. Vibration and Water Spraying Penetration: The operator activates the vibrator 2 to drive the entire grab cage 1 to vibrate at high frequency, breaking through the sand layer in front through the first penetration tip 122 and the second penetration tip 331; the first solenoid valve 3231 and the second solenoid valve 411 are opened simultaneously through the remote controller, and the first nozzle 1221 and the second nozzle 3311 spray high-pressure water to soften the dense sand layer in front and disperse the accumulated pebbles, so that the grab cage 1 can be smoothly penetrated to the target construction depth where underground pebbles are concentrated. It is required that the bottom of the grab cage 1 is lower than the bottom of the cutterhead, and the depth difference between the two is at least the length of the overlapping rod 121 plus 0.5 meters; after penetration, the operator closes the first solenoid valve 3231 and the second solenoid valve 411 through the remote controller to stop the water spraying operation; S3. Lifting and Filtering Gravel: The grab cage 1 is lifted upwards at a uniform speed. The overlapping rod 121 at the end of the support rod 12 rotates downwards and opens under the gravity of the sand layer, forming an overlap limit with the crossbar 33, so that the grab cage 1 forms a closed cage structure to collect the underground gravel and sand mixture. During the continuous lifting process, fine sand particles are naturally filtered out through the sand leakage gap 1211 between adjacent overlapping rods 121. Large gravel particles larger than the sand leakage gap 1211 are trapped inside the grab cage 1. Finally, the grab cage 1 with gravel is lifted as a whole to a safe position more than 1 meter above the construction area. S4. Unloading and Structure Reset: The operator drives the inner rod 31 and the crossbar 33 to rotate 90 degrees using the drive handwheel 4 in the clearance slot 3211, releasing the overlap limit between the crossbar 33 and the overlapping rod 121; the grab cage 1 is then lifted to fully open the overlapping rod 121, unloading the intercepted pebbles into the upper layer of sand in the construction area; after unloading, the operator reverses the drive handwheel 4 to reset the crossbar 33 and manually retracts the overlapping rod 121; then steps S2 to S4 are repeated until the large-diameter pebbles in the underground construction area are cleared.

[0036] The implementation principle of this application embodiment is as follows: the vibrating element 2 drives the grab cage 1 to vibrate at high frequency, and in conjunction with the first penetration tip 122 and the second penetration tip 331, it breaks through the sand layer in front. At the same time, high-pressure water is sprayed through the first nozzle 1221 and the second nozzle 3311 to soften the dense sand and disperse the pebble accumulation, so that the grab cage 1 can smoothly penetrate into the target depth under the combined action of its own weight and vibration force. Then, when the grab cage 1 is lifted, the overlapping rod 121 naturally swings down under the action of the gravity of the sand layer and overlaps with the crossbar 33 in the limiting component 3 to form a closed cage body to catch the sand and pebbles. At the same time, the adjacent overlapping rods 1 The 21 6cm sand-leaking gaps 1211 naturally filter out fine sand particles, while pebbles larger than 6cm are trapped inside the cage. After the entire grab cage 1 is lifted to a safe position outside the construction area, the operator rotates the drive handwheel 4 to rotate the inner rod 31 and the crossbar 33, which releases the overlap between the crossbar 33 and the overlapping rod 121. Under its own weight and residual disturbance, the overlapping rod 121 is fully opened, unloading the trapped pebbles into the upper layer of sand in the construction area. Thus, without damaging the ground structure, the grabbing, filtering and fixed-point unloading of underground pebbles can be completed efficiently and controllably.

[0037] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A pebble removal structure for pipe jacking construction, characterized in that: The device includes a grab cage (1) and a vibrating element (2) for providing vibration force to the grab cage (1). The grab cage (1) includes a frame (11) and a plurality of support rods (12) vertically fixed to the frame (11). The frame (11) is connected to the vibrating element (2). The support rods (12) located on opposite sides of the frame (11) are rotatably connected to the end away from the frame (11) with overlapping rods (121). Any of the overlapping rods (121) can rotate open and close under the action of the gravity of the sand layer. The grab cage (1) is provided with a limiting component (3) for limiting the opening and closing of the overlapping rods (121). A sand-leaking gap (1211) for scooping pebbles is formed between adjacent overlapping rods (121).

2. The pebble removal structure for pipe jacking construction according to claim 1, characterized in that: The limiting component (3) includes an inner rod (31), an outer sleeve (32), and a crossbar (33). The outer sleeve (32) is fitted over the inner rod (31). One end of the outer sleeve (32) is fixedly connected to the vibrating element (2), and the frame (11) is fixedly connected to the outer sleeve (32). The end of the inner rod (31) away from the vibrating element (2) extends out of the outer sleeve (32) and is fixedly connected to the crossbar (33). Each of the overlapping rods (121) can be rotated and opened to form an overlapping fit with the crossbar (33). The outer sleeve (32) has an avoidance groove (3211) at the end near the vibrating element (2). A drive handwheel (4) fixedly connected to the inner rod (31) is provided in the avoidance groove (3211). The inner rod (31) drives the crossbar (33) to rotate, which can release the overlapping fit between the crossbar (33) and the overlapping rod (121).

3. The pebble removal structure for pipe jacking construction according to claim 2, characterized in that: The inner wall of the clearance groove (3211) is provided with a protective pad (3212) for protecting the drive handwheel (4).

4. The pebble removal structure for pipe jacking construction according to claim 2, characterized in that: The outer sleeve (32) is fixedly connected to the frame (11) by a diagonal brace (111), and multiple diagonal braces (111) are arranged along the circumference of the frame (11).

5. A pebble removal structure for pipe jacking construction according to claim 2, characterized in that: Each of the support rods (12) has a first penetrating tip (122) at the end away from the frame (11).

6. A pebble removal structure for pipe jacking construction according to claim 5, characterized in that: The crossbar (33) is provided with a plurality of second penetration tips (331) along its axial direction.

7. A pebble removal structure for pipe jacking construction according to claim 5, characterized in that: A first nozzle (1221) is provided inside any of the first penetration tips (122). A water supply chamber (322) is provided on the side wall of the outer sleeve (32). A first water supply pipe (323) connected to the water supply chamber (322) is provided on the outer sleeve (32), and a first solenoid valve (3231) is provided on the first water supply pipe (323). The frame (11) and any of the support rods (12) are both configured as interconnected cavity structures. The cavity inside the frame (11) is connected to the water supply chamber (322), and any of the first nozzles (1221) is connected to the cavity inside the corresponding support rod (12).

8. A pebble removal structure for pipe jacking construction according to claim 6, characterized in that: A second nozzle (3311) is provided inside any of the second penetration tips (331). The inner rod (31) and the cross rod (33) are configured with interconnected cavity structures. A second water supply pipe (41) is provided on the drive handwheel (4) and is connected to the cavity inside the inner rod (31). A second solenoid valve (411) is provided on the second water supply pipe (41). A groove (3213) for avoiding the second water supply pipe (41) is opened on the inner wall of the clearance groove (3211). Any of the second nozzles (3311) is connected to the cavity inside the cross rod (33).

9. A non-excavation cobblestone removal process, characterized in that, The implementation using the pebble removal structure for pipe jacking construction as described in any one of claims 1-8 includes the following steps: S1. Construction pretreatment: Determine the location of underground gravel accumulation in the pipe jacking construction area, hoist the gravel removal structure into place, connect to the external high-pressure water supply equipment, complete the pipeline connection of the first water supply pipe (323) and the second water supply pipe (41), and check the operating status of the first solenoid valve (3231), the second solenoid valve (411), the vibrating component (2) and the drive handwheel (4) to ensure that each component operates normally and the pipeline is sealed properly. S2, Vibration and water jet penetration: Start the vibrating component (2) to drive the grab cage (1) to vibrate at high frequency, and break through the sand layer in front through the first penetration tip (122) and the second penetration tip (331); Simultaneously open the first solenoid valve (3231) and the second solenoid valve (411), and spray high-pressure water through the first nozzle (1221) and the second nozzle (3311) to soften the dense sand layer in front and disperse the accumulated pebbles, so that the grab cage (1) can be smoothly penetrated to the target construction depth where underground pebbles are abundant; After reaching the target depth, close the first solenoid valve (3231) and the second solenoid valve (411) to stop the water jetting operation; S3, Lifting and Filtering Gravel: Lift the grab cage (1) upward at a uniform speed. The overlapping rod (121) at the end of the support rod (12) rotates downward under the gravity of the sand layer and forms an overlap limit with the crossbar (33), so that the grab cage (1) forms a closed cage structure to collect the underground gravel and sand mixture. During the continuous lifting process, fine sand particles are naturally filtered out through the sand leakage gap (1211) between adjacent overlapping rods (121), and large-diameter gravel with a particle size larger than the sand leakage gap (1211) is trapped inside the grab cage (1). Finally, the grab cage (1) with gravel is lifted as a whole to a safe position above the construction area. S4. Unloading and structural reset: Drive the inner rod (31) and crossbar (33) to rotate by the drive handwheel (4) in the clearance groove (3211), release the overlap limit between the crossbar (33) and the overlapping rod (121); continue to lift the grab cage (1) to fully open the overlapping rod (121) and unload the intercepted pebbles into the upper layer of sand in the construction area; after unloading, rotate the drive handwheel (4) in the opposite direction to reset the crossbar (33) and manually retract the overlapping rod (121); then repeat steps S2 to S4 until the large-diameter pebbles in the underground construction area are cleaned up.

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