A segmented synchronous grouting pressure maintaining device suitable for pipe jacking of soft overburden

Abstract

The application provides a segmented synchronous grouting pressure maintaining device suitable for a pipe jacking in a soft cover layer, comprising a stirring assembly and a filtering assembly arranged at the bottom of the stirring assembly. The segmented synchronous grouting pressure maintaining device suitable for the pipe jacking in the soft cover layer is matched with the stirring assembly, the filtering assembly, a slurry storage tank, a first pump body, a conveying pipe, a control assembly, a shunt assembly and a grouting assembly. After stirring and slurry preparation, impurities are removed through the filtering assembly and stored in the slurry storage tank. The first pump body uniformly sends slurry to the conveying pipe. Each shunt assembly independently distributes slurry and controls the grouting pressure of each pipe section through the grouting assembly. The grouting flow and pressure can be matched according to the leakage of different sections of the soft cover layer. A continuous and complete slurry sleeve is formed along the whole line, so that the local slurry sleeve is prevented from being broken, the soil body is prevented from being lost, and the surface is prevented from being excessively subsided.

Description

Technical Field

[0001] This invention relates to the field of grouting equipment for trenchless pipe jacking construction, and in particular to a segmented synchronous grouting and pressure-maintaining device suitable for pipe jacking in soft overburden layers. Background Technology

[0002] Pipe jacking is a trenchless underground pipeline laying technology. Prefabricated pipes are jacked section by section from a starting shaft into the ground using jacking equipment, completing the underground pipeline installation without excavating the surface. During pipe jacking, to reduce frictional resistance between the pipe sections and the surrounding soil, fill the gaps between the pipe wall and the ground, and control ground settlement, lubricating grout (usually bentonite grout) is injected into the outer wall of the pipe sections simultaneously with jacking. This process is called synchronous grouting. The grout sleeve formed by grouting not only lubricates and reduces resistance but also effectively supports the surrounding soil, preventing overburden collapse and surface subsidence. It is a key technical aspect ensuring the safety and quality of pipe jacking construction. Especially in soft overburden layers (such as silty clay, silty sand, and loose fill), the soil has poor self-stabilizing ability and high permeability, making it easy for grout to leak into the ground in large quantities. This makes it difficult to maintain the integrity of the grout sleeve, significantly increasing the difficulty of grouting and pressure maintenance.

[0003] Currently, existing pipe jacking synchronous grouting systems typically include a slurry mixing plant, a slurry storage tank, a grouting pump, a main delivery pipe, and several branch pipes connected to the grouting holes of each pipe section. The grouting pump synchronously pumps slurry through the main pipe and branch pipes to each grouting hole, injecting it into the annular gap between the pipe wall and the ground. Some systems are equipped with manual valves or solenoid valves on the branch pipes to regulate the opening and closing of each grouting hole, or monitor the grouting pressure using a pressure gauge on the main pipe. This centralized grout supply and synchronous grouting method can generally meet construction requirements under typical geological conditions.

[0004] However, existing grouting devices cannot independently control the grouting pressure of each section, making it difficult to maintain a complete mud lubrication layer, reduce jacking resistance, and minimize soil loss and settlement in the cover layer, especially in cases where the soft cover layer is prone to leakage and mud sleeve breakage. Specifically, existing centralized grouting systems use a uniform grouting pressure and flow rate for each grouting hole, making it impossible to independently adjust the pressure according to the differences in strata, leakage levels, and pressure losses in different sections of the pipe section. This results in insufficient grouting pressure and missing mud sleeves in some sections, while the pressure is too high and mud flows through other sections, making it difficult to form a continuous and stable mud sleeve along the entire pipe jacking route. In severe cases, this can lead to significant soil loss in the cover layer or even collapse accidents.

[0005] Therefore, it is necessary to provide a segmented synchronous grouting and pressure-maintaining device suitable for jacking pipes in weak overburden layers to solve the above-mentioned technical problems. Summary of the Invention

[0006] This invention provides a segmented synchronous grouting and pressure-maintaining device suitable for pipe jacking in soft overburden layers. It solves the problems of traditional pipe jacking grouting equipment where the main pipe supplies pressure and each pipe section cannot be independently pressure-regulated, which can easily lead to mud sleeve breakage, soil loss, and excessive surface settlement in soft strata.

[0007] To solve the above-mentioned technical problems, the present invention provides a segmented synchronous grouting and pressure-maintaining device suitable for pipe jacking in weak overburden layers, comprising:

[0008] Stirring components;

[0009] A filter assembly is disposed at the bottom of the stirring assembly;

[0010] A slurry storage tank is provided at the output end of the filter assembly. A first pump body is provided on the side of the slurry storage tank, and a delivery pipe is installed at the output end of the first pump body.

[0011] A control component is disposed on the side of the stirring component;

[0012] Multiple diversion components are provided, each of which is connected to the delivery pipe, and multiple grouting components are provided on the side of each of the multiple diversion components.

[0013] Preferably, the diversion assembly includes a branch pipe, a second pump body, and a diversion pipe, wherein the branch pipe is connected to the delivery pipe, the second pump body is connected to the branch pipe, and the diversion pipe is connected to the second pump body.

[0014] Preferably, the grouting assembly includes an installation pipe, a one-way valve, a grouting component, a solenoid valve, and a grout outlet component. The installation pipe is connected to the diversion pipe. The one-way valve is fixedly installed at the output end of the installation pipe. The grouting component is located at the output end of the one-way valve. The solenoid valve is located at the output end of the grouting component. The grout outlet component is located at the output end of the solenoid valve.

[0015] Preferably, the pressure-reducing component includes a tank, a drive motor, a reciprocating screw, a piston plate, two corrugated telescopic sleeves, and multiple anti-backflow components. The tank is fixedly installed at the output end of the one-way valve and the input end of the solenoid valve. The drive motor is fixedly installed at one end of the tank. The reciprocating screw is fixedly installed at the output end of the drive motor. The piston plate is threadedly fitted to the outer side of the reciprocating screw and fits against the inner side of the tank. The two ends of the two corrugated telescopic sleeves are respectively fixedly installed to both sides of the piston plate and the inner side of the tank, and are sleeved on the outer side of the reciprocating screw. Multiple anti-backflow components are all disposed on the surface of the piston plate.

[0016] Preferably, the slurry outlet component includes a nozzle, a fixing ring, a first sealing plate, a sliding rod, a connecting rod, a limiting plate, a first spring, a mounting rod, and a pressure sensor. The nozzle is fixedly installed at the output end of the solenoid valve, the fixing ring is fixedly installed on the inner side of the nozzle, the first sealing plate is disposed on one side of the fixing ring, the sliding rod is fixedly installed on the side of the first sealing plate, the connecting rod is slidably connected to the outer side of the sliding rod, and both ends are fixedly installed on the inner side of the nozzle, the limiting plate is fixedly installed at one end of the sliding rod, the first spring is sleeved on the outer side of the sliding rod, the mounting rod is fixedly installed on the inner side of the nozzle, and the pressure sensor is fixedly installed on one side of the mounting rod.

[0017] Preferably, the anti-backflow component includes a through hole, a fixed rod, a movable rod, a second sealing plate, a baffle, and a second spring. The through hole is opened inside the piston plate, the fixed rod is fixedly installed on the inner side of the through hole, the movable rod is slidably connected to the inside of the fixed rod, the second sealing plate is fixedly installed at one end of the movable rod, the baffle is fixedly installed at the other end of the movable rod, and the second spring is sleeved on the outer side of the movable rod.

[0018] Preferably, the second sealing plate is disposed on one side of the piston plate, and the baffle is disposed on the other side of the second sealing plate.

[0019] Preferably, the second spring is disposed between the piston plate and the baffle.

[0020] Preferably, the filter assembly includes a housing, a pull plate, a filter frame, a filter plate, and a support plate. The pull plate is disposed on the front side of the housing, the filter frame is fixedly installed on the back side of the pull plate, the filter plate is fixedly installed on the bottom of the inner side of the filter frame, and the support plate is fixedly installed on the inner side of the housing and located at the bottom of the filter frame.

[0021] Preferably, the top of the outer shell is fixedly installed on the bottom of the stirring assembly, and the bottom of the outer shell is connected to the slurry storage tank.

[0022] Compared with related technologies, the segmented synchronous grouting and pressure-maintaining device for jacking pipes in weak overburden layers provided by the present invention has the following beneficial effects:

[0023] This invention provides a segmented synchronous grouting and pressure-maintaining device suitable for pipe jacking in weak overburden layers. The device comprises a mixing assembly, a filtering assembly, a slurry storage tank, a first pump body, a delivery pipe, a control assembly, a flow distribution assembly, and a grouting assembly that work together. After mixing and preparing the slurry, it is filtered to remove impurities and stored in the slurry storage tank. The first pump body delivers slurry to the delivery pipe. Each flow distribution assembly independently prepares slurry for its segment, and the grouting assembly individually regulates the grouting pressure of each pipe section. This allows for matching the corresponding grouting flow rate and pressure according to the leakage conditions in different sections of the weak overburden layer, forming a continuous and complete mud sleeve along the entire line. This avoids local mud sleeve breakage, soil loss, and excessive surface settlement, solving the problems of traditional pipe jacking grouting equipment where the main pipe provides unified pressure, each pipe section cannot be independently pressure-regulated, and weak strata are prone to mud sleeve breakage, soil loss, and excessive surface settlement. Attached Figure Description

[0024] Figure 1 A schematic diagram of the structure of a first embodiment of a segmented synchronous grouting and pressure-maintaining device for jacking pipes in soft overburden layers provided by the present invention;

[0025] Figure 2 for Figure 1 The diagram shows the structure of the delivery pipe, diversion assembly, and grouting assembly.

[0026] Figure 3 for Figure 2 The diagram shows a partial cross-sectional view of the grouting assembly.

[0027] Figure 4 for Figure 3 The diagram shows the structure of the grouting component.

[0028] Figure 5 for Figure 3 The diagram shows the structure of the slurry outlet.

[0029] Figure 6 A schematic diagram of the second embodiment of a segmented synchronous grouting and pressure-maintaining device for jacking pipes in weak overburden layers provided by the present invention;

[0030] Figure 7 This is a schematic diagram of the third embodiment of a segmented synchronous grouting and pressure-maintaining device for jacking pipes in weak overburden layers, provided by the present invention.

[0031] Numbered components in the diagram: 1. Mixing assembly; 2. Slurry storage tank; 3. First pump body; 4. Control assembly; 5. Delivery pipe; 6. Diversion assembly; 61. Branch pipe; 62. Second pump body; 63. Diversion pipe; 7. Grouting assembly; 71. Installation pipe; 72. Check valve; 73. Grouting component; 731. Tank body; 732. Drive motor; 733. Reciprocating screw; 734. Piston plate; 735. Corrugated expansion sleeve; 736. Anti-backflow component; 74. Solenoid valve; 75. Slurry outlet component; 751. Nozzle. 752. Fixing ring; 753. First sealing plate; 754. Sliding rod; 755. Connecting rod; 756. Limiting plate; 757. First spring; 758. Mounting rod; 756. Pressure sensor; 7361. Through hole; 7362. Fixing rod; 7363. Moving rod; 7364. Second sealing plate; 7365. Baffle; 7366. Second spring; 8. Filter assembly; 81. Housing; 82. Pull plate; 83. Filter frame; 84. Filter plate; 85. Support plate. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0033] First Embodiment

[0034] Please refer to the following: Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 ,in, Figure 1 A schematic diagram of the structure of a first embodiment of a segmented synchronous grouting and pressure-maintaining device for jacking pipes in soft overburden layers provided by the present invention; Figure 2 for Figure 1 The diagram shows the structure of the delivery pipe, diversion assembly, and grouting assembly. Figure 3 for Figure 2 The diagram shows a partial cross-sectional view of the grouting assembly. Figure 4 for Figure 3 The diagram shows the structure of the grouting component. Figure 5 for Figure 3 The diagram shows the structure of the slurry outlet.

[0035] A segmented synchronous grouting and pressure-maintaining device suitable for jacking pipes in weak overburden layers includes: a mixing assembly 1;

[0036] A filter assembly 8 is disposed at the bottom of the stirring assembly 1;

[0037] A slurry storage tank 2 is located at the output end of the filter assembly 8. A first pump body 3 is provided on the side of the slurry storage tank 2, and a delivery pipe 5 is installed at the output end of the first pump body 3.

[0038] Control component 4, which is disposed on the side of the stirring component 1;

[0039] Multiple diversion components 6 are provided, each of which is connected to the conveying pipe 5, and multiple grouting components 7 are provided on the side of each of the multiple diversion components 6.

[0040] The diversion assembly 6 includes a branch pipe 61, a second pump body 62, and a diversion pipe 63. The branch pipe 61 is connected to the delivery pipe 5, the second pump body 62 is connected to the branch pipe 61, and the diversion pipe 63 is connected to the second pump body 62.

[0041] The diversion component 6 is arranged independently in sections according to the single pipe section of the jacking pipe. Each section corresponds to an independent second pump body 62 to achieve independent pressure regulation in each section. The permeability coefficient of different sections of the weak overburden layer is different. Each section can be matched with the grouting flow rate according to the leakage of the stratum, so that there will be no problem of local grout leakage or grout shortage caused by uniform pressure throughout the line. The branch pipe 61 connects to the main pipe for unified grout supply, and the diversion pipe 63 delivers grout to the circumferential grouting points of the pipe section in multiple ways to achieve uniform grout distribution in the circumference of a single pipe section.

[0042] The grouting assembly 7 includes an installation pipe 71, a one-way valve 72, a grouting component 73, a solenoid valve 74, and a grout outlet 75. The installation pipe 71 is connected to the diversion pipe 63. The one-way valve 72 is fixedly installed at the output end of the installation pipe 71. The grouting component 73 is located at the output end of the one-way valve 72. The solenoid valve 74 is located at the output end of the grouting component 73. The grout outlet 75 is located at the output end of the solenoid valve 74.

[0043] One-way valve 72 forms the first backflow prevention barrier, so that the slurry in the pipe will not flow back to the diversion pipe 63 after the machine stops, thus avoiding mud sedimentation and pipe blockage. It is suitable for intermittent jacking and intermittent grouting construction conditions. The grouting component 73 has a built-in piston pressure stabilizing structure, which can output slurry continuously. The solenoid valve 74 is electrically connected to the control component 4 and can be automatically opened and closed according to the jacking speed.

[0044] The pressure-reducing component includes a tank body 731, a drive motor 732, a reciprocating screw 733, a piston plate 734, two corrugated telescopic sleeves 735, and multiple anti-backflow components 736. The tank body 731 is fixedly installed at the output end of the one-way valve 72 and the input end of the solenoid valve 74. The drive motor 732 is fixedly installed at one end of the tank body 731. The reciprocating screw 733 is fixedly installed at the output end of the drive motor 732. The piston plate 734 is threadedly fitted to the outer side of the reciprocating screw 733 and fits against the inner side of the tank body 731. The two ends of the two corrugated telescopic sleeves 735 are respectively fixedly installed to the two sides of the piston plate 734 and the inner side of the tank body 731, and are sleeved on the outer side of the reciprocating screw 733. Multiple anti-backflow components 736 are all disposed on the surface of the piston plate 734.

[0045] The drive motor 732 drives the reciprocating screw 733 to drive the piston plate 734 to push the slurry at a constant speed. The tank 731 continuously outputs slurry at a constant pressure, which solves the defect of sudden pressure drop caused by a large amount of instantaneous leakage of slurry in soft strata. The corrugated expansion sleeve 735 isolates the screw from the slurry and prevents the bentonite slurry from sticking and jamming the transmission structure. The piston plate 734 integrates multiple anti-backflow components 736, which automatically close during the grouting stage and allow unidirectional flow during the replenishment stage.

[0046] The slurry outlet component 75 includes a nozzle 751, a fixing ring 752, a first sealing plate 753, a sliding rod 754, a connecting rod 755, a limiting plate 756, a first spring 757, a mounting rod 758, and a pressure sensor 756. The nozzle 751 is fixedly installed at the output end of the solenoid valve 74. The fixing ring 752 is fixedly installed on the inner side of the nozzle 751. The first sealing plate 753 is disposed on one side of the fixing ring 752. The sliding rod 754 is fixedly installed on the side of the first sealing plate 753. The connecting rod 755 is slidably connected to the outer side of the sliding rod 754, and both ends are fixedly installed on the inner side of the nozzle 751. The limiting plate 756 is fixedly installed at one end of the sliding rod 754. The first spring 757 is sleeved on the outer side of the sliding rod 754. The mounting rod 758 is fixedly installed on the inner side of the nozzle 751. The pressure sensor 756 is fixedly installed on one side of the mounting rod 758.

[0047] The nozzle 751 has a built-in pressure sensor 756 that collects the grouting pressure at a single point in real time. The data is transmitted to the control component 4, and the staff can precisely adjust the output power of the second pump body 62 in segments to adjust the pressure in different strata such as silty clay, silt, and gravel. The first spring 757 drives the first sealing plate 753 to form a self-sealing structure at the end, which seals the nozzle at the moment of shutdown, preventing soil and groundwater from flowing back into the grouting pipeline. The nozzle 751 discharges grout in an annular oblique direction, and the grout spreads evenly along the pipe wall in 360°, quickly forming a continuous annular mud support sleeve to reduce the loss of soft soil layers and prevent ground subsidence.

[0048] The working principle of the segmented synchronous grouting and pressure-maintaining device for pipe jacking in soft overburden layers provided by this invention is as follows:

[0049] When performing grouting operations for pipe jacking in weak overburden layers, bentonite and other slurry-making raw materials are first added to the mixing unit 1, and water is added and stirred to form a uniform slurry. The stirred slurry enters the filtration unit 8, and the filtered slurry flows into the storage tank 2 for later use.

[0050] During grouting, the first pump 3 is started, and the slurry in the storage tank 2 is transported to each diversion component 6 through the delivery pipe 5. The slurry first enters the branch pipe 61 of each diversion component 6, and after being pressurized by the second pump 62, it enters the diversion pipe 63, and is distributed by the diversion pipe 63 to the multiple grouting components 7 corresponding to that segment.

[0051] After the slurry enters the installation pipe 71 of the grouting assembly 7, it passes through the one-way valve 72 and enters the tank 731 of the grouting component 73. The drive motor 732 of the grouting component 73 starts, rotating the reciprocating screw 733 and driving the piston plate 734 forward at a constant speed along the inner wall of the tank 731 (towards the solenoid valve 74), pushing the slurry in the tank 731 to the solenoid valve 74 at a constant pressure. During the forward pushing of the piston plate 734, the anti-backflow component 736 on the surface of the piston plate 734 is in a closed state, preventing the slurry from flowing back to the rear of the piston plate 734. The corrugated expansion sleeve 735 expands and contracts synchronously with the reciprocating motion of the piston plate 734, always covering the exposed part of the reciprocating screw 733 to prevent slurry from eroding the screw surface and causing jamming.

[0052] Control component 4 controls the opening of solenoid valve 74 according to the preset grouting pressure and jacking speed. Constant pressure slurry enters the nozzle 751 of the slurry outlet 75 through solenoid valve 74. After the slurry enters the nozzle 751, it first pushes the first sealing plate 753 to overcome the elastic force of the first spring 757, causing the first sealing plate 753 to disengage from the sealing contact with the fixing ring 752, opening the slurry outlet channel. The slurry is then sprayed out obliquely in an annular direction through nozzle 751, and is evenly injected into the annular gap between the outer wall of the pipe section and the formation along the pipe wall, forming a continuous annular slurry support sleeve.

[0053] During the grouting process, pressure sensor 756 collects the actual pressure of the mud at nozzle 751 in real time and feeds the pressure signal back to control component 4. Based on the pressure data fed back from each segment, control component 4 independently adjusts the output power of the corresponding second pump body 62, ensuring that the grouting pressure of each segment matches the geological conditions of the corresponding section. The grouting pressure is increased in sections with high permeability in soft strata and decreased in sections with low permeability, achieving independent pressure regulation for each segment.

[0054] When grouting is paused or completed, the solenoid valve 74 closes, and the first spring 757 pushes the first sealing plate 753 to reset and fit tightly against the fixing ring 752, automatically sealing the nozzle 751 outlet to prevent soil and groundwater from flowing back into the grouting pipeline. The one-way valve 72 simultaneously forms the first backflow prevention barrier, preventing grout from flowing back into the diversion pipe 63 after shutdown, and avoiding slurry sedimentation that could clog the pipeline.

[0055] Compared with related technologies, the segmented synchronous grouting and pressure-maintaining device for jacking pipes in weak overburden layers provided by the present invention has the following beneficial effects:

[0056] The mixing assembly 1, filtration assembly 8, slurry storage tank 2, first pump body 3, delivery pipe 5, control assembly 4, diversion assembly 6, and grouting assembly 7 work together to mix and prepare the slurry. After being mixed and prepared, the slurry is filtered by the filtration assembly 8 and stored in the slurry storage tank 2. The first pump body 3 delivers the slurry to the delivery pipe 5. Each diversion assembly 6 independently prepares the slurry in sections, and the grouting pressure of each pipe section is individually adjusted by the grouting assembly 7. This allows for matching the corresponding grouting flow rate and pressure according to the leakage situation in different sections of the weak overburden layer, forming a continuous and complete mud sleeve along the entire line. This avoids local mud sleeve breakage, soil loss, and excessive surface settlement, and solves the problems of traditional pipe jacking grouting equipment where the main pipe supplies pressure and each pipe section cannot be independently adjusted, which easily leads to mud sleeve breakage, soil loss, and excessive surface settlement in weak strata.

[0057] Second Embodiment

[0058] Please refer to the following: Figure 6 Based on the first embodiment of this application, which provides a segmented synchronous grouting and pressure-maintaining device suitable for pipe jacking in weak overburden layers, the second embodiment of this application proposes another segmented synchronous grouting and pressure-maintaining device suitable for pipe jacking in weak overburden layers. The second embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the separate implementation of the first embodiment.

[0059] Specifically, the second embodiment of this application provides a segmented synchronous grouting and pressure-maintaining device suitable for jacking pipes in soft overburden layers. The device includes an anti-backflow component 736 comprising a through hole 7361, a fixed rod 7362, a movable rod 7363, a second sealing plate 7364, a baffle 7365, and a second spring 7366. The through hole 7361 is located inside the piston plate 734. The fixed rod 7362 is fixedly installed on the inner side of the through hole 7361. The movable rod 7363 is slidably connected to the inside of the fixed rod 7362. The second sealing plate 7364 is fixedly installed at one end of the movable rod 7363. The baffle 7365 is fixedly installed at the other end of the movable rod 7363. The second spring 7366 is sleeved on the outer side of the movable rod 7363.

[0060] When the piston pushes the slurry forward, the second sealing plate 7364 blocks the through hole 7361; when the piston returns to replenish the slurry, the second sealing plate 7364 moves away from the through hole 7361, allowing the slurry to enter the front end of the piston plate 734 for subsequent slurry replenishment.

[0061] The second sealing plate 7364 is disposed on one side of the piston plate 734, and the baffle 7365 is disposed on the other side of the second sealing plate 7364.

[0062] The second spring 7366 is disposed between the piston plate 734 and the baffle 7365.

[0063] The working principle of the segmented synchronous grouting and pressure-maintaining device for pipe jacking in soft overburden layers provided by this invention is as follows:

[0064] The drive motor 732 of the grouting component 73 drives the reciprocating screw 733 to rotate, driving the piston plate 734 to reciprocate along the inner wall of the tank 731. When the piston plate 734 pushes the slurry forward (towards the solenoid valve 74), the slurry pressure in front of the piston plate 734 in the tank 731 increases. This pressure acts on the side of the second sealing plate 7364 facing the piston plate 734, pushing the second sealing plate 7364 to move towards the piston plate 734. The second sealing plate 7364 drives the moving rod 7363 to slide along the inside of the fixed rod 7362, so that the second sealing plate 7364 is tightly attached to the surface of the piston plate 734, completely sealing the through hole 7361. At this time, the second sealing plate 7364 and the through hole 7361 form a sealing fit to prevent the mud in front of the piston plate 734 from flowing back to the low-pressure area behind the piston plate 734 through the through hole 7361 under high pressure, and to ensure that the mud in front of the piston plate 734 is continuously pushed to the solenoid valve 74 at a constant pressure.

[0065] When the piston plate 734 moves backward (towards the drive motor 732) to replenish the mud, the space in the tank 731 in front of the piston plate 734 expands, the pressure decreases, and a negative pressure is formed. At this time, the mud pressure behind the piston plate 734 is greater than the pressure in front, and the mud pushes the second sealing plate 7364 to move away from the piston plate 734. The second sealing plate 7364 drives the baffle 7365 to move synchronously through the moving rod 7363, compressing the second spring 7366 located between the piston plate 734 and the baffle 7365, causing the second sealing plate 7364 to disengage from the through hole 7361 and open the mud channel. The mud behind then enters the space in the tank 731 in front of the piston plate 734 through the through hole 7361, completing the mud replenishment.

[0066] After the grouting is completed, the piston plate 734 moves forward again, increasing the slurry pressure and pushing the second sealing plate 7364 to re-adhere to the surface of the piston plate 734, sealing the through hole 7361 and restoring the grouting state. This process is repeated to achieve unidirectional flow.

[0067] Compared with related technologies, the segmented synchronous grouting and pressure-maintaining device for jacking pipes in weak overburden layers provided by the present invention has the following beneficial effects:

[0068] The anti-backflow component 736, composed of a through hole 7361, a fixed rod 7362, a moving rod 7363, a second sealing plate 7364, a baffle 7365, and a second spring 7366, works in conjunction with the piston plate 734, the reciprocating screw 733, and the tank body 731. When the piston plate 734 pushes the slurry forward, the slurry pressure presses against the second sealing plate 7364 to seal the through hole 7361, preventing high-pressure slurry backflow. When the piston plate 734 retracts to replenish slurry, the negative pressure pulls the second sealing plate 7364 away, allowing the slurry to pass through the through hole 7361 to complete the cavity replenishment. This continuously maintains the stable pressure output of the grouting component 73, ensuring constant segmented grouting pressure and preventing instantaneous slurry leakage in soft strata from causing damage to the slurry sleeve.

[0069] Third Embodiment

[0070] Please refer to the following: Figure 7 Based on the first embodiment of this application, a segmented synchronous grouting and pressure-maintaining device suitable for pipe jacking in weak overburden layers is provided. The third embodiment of this application proposes another segmented synchronous grouting and pressure-maintaining device suitable for pipe jacking in weak overburden layers. The third embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the individual implementation of the first embodiment.

[0071] Specifically, the third embodiment of this application provides a segmented synchronous grouting and pressure-maintaining device suitable for jacking pipes in weak overburden layers. The difference lies in that the filter assembly 8 of the segmented synchronous grouting and pressure-maintaining device suitable for jacking pipes in weak overburden layers includes a housing 81, a pull plate 82, a filter frame 83, a filter plate 84, and a support plate 85. The pull plate 82 is disposed on the front side of the housing 81, the filter frame 83 is fixedly installed on the back side of the pull plate 82, the filter plate 84 is fixedly installed on the bottom of the inner side of the filter frame 83, and the support plate 85 is fixedly installed on the inner side of the housing 81 and located at the bottom of the filter frame 83.

[0072] After mixing, the bentonite slurry is first screened by the filter assembly 8 to remove lumpy cement, sand and gravel impurities, preventing tiny particles from clogging the fine holes of the nozzle 751, and is suitable for long-distance grouting pipelines for pipe jacking; the pull-out filter frame 83 can be quickly removed and the filter residue cleaned without disassembling the whole machine, which meets the needs of continuous pipe jacking and large-scale grouting construction on site; the support plate 85 supports the filter frame 83, preventing the high-pressure slurry from impacting the filter plate 84 and causing deformation and damage, thus ensuring continuous filtration effect.

[0073] The top of the outer shell 81 is fixedly installed on the bottom of the stirring assembly 1, and the bottom of the outer shell 81 is connected to the slurry storage tank 2.

[0074] The working principle of the segmented synchronous grouting and pressure-maintaining device for pipe jacking in soft overburden layers provided by this invention is as follows:

[0075] After the mixing component 1 completes the mixing of the slurry, the slurry enters the housing 81 of the filter component 8 from its bottom outlet. The slurry first falls onto the filter plate 84 at the bottom of the filter frame 83, and under the action of gravity, it permeates downward through the filter holes of the filter plate 84, filtering out large particles of impurities such as lumpy cement and sand that have not been fully mixed in the slurry. The qualified slurry, after passing through the filter plate 84, continues to flow downward and enters the slurry storage tank 2 through the bottom outlet of the housing 81 for storage and later use. The support plate 85 is fixedly installed on the inner side of the housing 81 and located at the bottom of the filter frame 83. During the filtration process, it supports the filter frame 83 and prevents the filter plate 84 from deforming and breaking due to the impact of high-pressure slurry.

[0076] Once the filter residue trapped inside the filter frame 83 accumulates to a certain amount, the operator only needs to pull the pull plate 82 on the front of the outer shell 81 forward to pull the filter frame 83 and the filter plate 84 out of the outer shell 81 horizontally, and then clean the filter residue inside the filter frame 83.

[0077] Compared with related technologies, the segmented synchronous grouting and pressure-maintaining device for jacking pipes in weak overburden layers provided by the present invention has the following beneficial effects:

[0078] The filter assembly 8, consisting of the outer shell 81, pull plate 82, filter frame 83, filter plate 84, and support plate 85, works in conjunction with the mixing assembly 1 and the slurry storage tank 2. The mixed slurry flows into the interior of the outer shell 81, and the filter plate 84 intercepts the lumps of sand and gravel impurities in the slurry. The qualified slurry flows downward into the slurry storage tank 2, preventing impurities from clogging the diversion assembly 6 and the grouting assembly 7, ensuring the continuous and stable segmented pressure regulating grouting, and preventing impurities from causing pipeline blockage and resulting in the loss of local slurry sleeves.

[0079] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A segmented synchronous grouting and pressure-maintaining device suitable for pipe jacking in weak overburden layers, characterized in that, include: Stirring components; A filter assembly is disposed at the bottom of the stirring assembly; A slurry storage tank is provided at the output end of the filter assembly. A first pump body is provided on the side of the slurry storage tank, and a delivery pipe is installed at the output end of the first pump body. A control component is disposed on the side of the stirring component; Multiple diversion components are provided, each of which is connected to the delivery pipe, and multiple grouting components are provided on the side of each of the multiple diversion components.

2. The segmented synchronous grouting and pressure-maintaining device for pipe jacking in soft overburden layers according to claim 1, characterized in that, The diversion assembly includes a branch pipe, a second pump body, and a diversion pipe. The branch pipe is connected to the delivery pipe, the second pump body is connected to the branch pipe, and the diversion pipe is connected to the second pump body.

3. A segmented synchronous grouting and pressure-maintaining device for pipe jacking in soft overburden layers according to claim 2, characterized in that, The grouting assembly includes an installation pipe, a one-way valve, a grouting component, a solenoid valve, and a grout outlet component. The installation pipe is connected to the diversion pipe. The one-way valve is fixedly installed at the output end of the installation pipe. The grouting component is located at the output end of the one-way valve. The solenoid valve is located at the output end of the grouting component. The grout outlet component is located at the output end of the solenoid valve.

4. A segmented synchronous grouting and pressure-maintaining device for pipe jacking in soft overburden layers according to claim 3, characterized in that, The pressure-reducing component includes a tank, a drive motor, a reciprocating screw, a piston plate, two corrugated telescopic sleeves, and multiple anti-backflow components. The tank is fixedly installed at the output end of the one-way valve and the input end of the solenoid valve. The drive motor is fixedly installed at one end of the tank. The reciprocating screw is fixedly installed at the output end of the drive motor. The piston plate is threaded onto the outer side of the reciprocating screw and fits against the inner side of the tank. The two ends of the two corrugated telescopic sleeves are fixedly installed to both sides of the piston plate and the inner side of the tank, respectively, and are sleeved on the outer side of the reciprocating screw. Multiple anti-backflow components are all disposed on the surface of the piston plate.

5. A segmented synchronous grouting and pressure-maintaining device for pipe jacking in soft overburden layers according to claim 3, characterized in that, The slurry outlet component includes a nozzle, a fixing ring, a first sealing plate, a sliding rod, a connecting rod, a limiting plate, a first spring, a mounting rod, and a pressure sensor. The nozzle is fixedly installed at the output end of the solenoid valve. The fixing ring is fixedly installed on the inner side of the nozzle. The first sealing plate is disposed on one side of the fixing ring. The sliding rod is fixedly installed on the side of the first sealing plate. The connecting rod is slidably connected to the outer side of the sliding rod, and both ends are fixedly installed on the inner side of the nozzle. The limiting plate is fixedly installed at one end of the sliding rod. The first spring is sleeved on the outer side of the sliding rod. The mounting rod is fixedly installed on the inner side of the nozzle. The pressure sensor is fixedly installed on one side of the mounting rod.

6. A segmented synchronous grouting and pressure-maintaining device for pipe jacking in soft overburden layers according to claim 4, characterized in that, The anti-backflow component includes a through hole, a fixed rod, a movable rod, a second sealing plate, a baffle, and a second spring. The through hole is opened inside the piston plate. The fixed rod is fixedly installed on the inner side of the through hole. The movable rod is slidably connected to the inside of the fixed rod. The second sealing plate is fixedly installed at one end of the movable rod. The baffle is fixedly installed at the other end of the movable rod. The second spring is sleeved on the outer side of the movable rod.

7. A segmented synchronous grouting and pressure-maintaining device for pipe jacking in soft overburden layers according to claim 6, characterized in that, The second sealing plate is disposed on one side of the piston plate, and the baffle is disposed on the other side of the second sealing plate.

8. A segmented synchronous grouting and pressure-maintaining device for pipe jacking in soft overburden layers according to claim 7, characterized in that, The second spring is disposed between the piston plate and the baffle.

9. A segmented synchronous grouting and pressure-maintaining device for pipe jacking in soft overburden layers according to claim 1, characterized in that, The filter assembly includes a housing, a pull plate, a filter frame, a filter plate, and a support plate. The pull plate is disposed on the front of the housing, the filter frame is fixedly installed on the back of the pull plate, the filter plate is fixedly installed on the bottom of the inner side of the filter frame, and the support plate is fixedly installed on the inner side of the housing and located at the bottom of the filter frame.

10. A segmented synchronous grouting and pressure-maintaining device for pipe jacking in soft overburden layers according to claim 9, characterized in that, The top of the outer shell is fixedly installed on the bottom of the stirring assembly, and the bottom of the outer shell is connected to the slurry storage tank.

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