A soil drag reduction and lubrication device for box-type pipe jacking construction

Abstract

This utility model relates to a soil drag reduction and lubrication device for box-type pipe jacking construction, including grouting equipment, injection pipe, and drag reduction and lubrication mechanism; the output end of the grouting equipment is connected to the injection pipe, and the other end of the injection pipe is connected to the drag reduction and lubrication mechanism for reducing the resistance between the outside of the pipe and the soil; the drag reduction and lubrication mechanism includes a ring-shaped supporting hollow ring, one side of the supporting hollow ring is connected to the injection pipe, and the other side of the supporting hollow ring is connected to multiple sets of evenly distributed connecting pipes, the other end of each connecting pipe is connected to a solid supporting ring, and evenly distributed discharge nozzles are installed on the outside of the solid supporting ring; compared with the prior art, the beneficial effects of this utility model are: once soil blockage of the discharge nozzle occurs, by opening the first solenoid valve of that part, the pressure increases, which helps to flush out the soil blocking the discharge nozzle, ensuring the discharge of thixotropic mud, ensuring the smooth jacking operation of the top ring, and reducing the deviation of the top ring to a certain extent.

Description

Technical Field

[0001] This utility model relates to the field of pipe jacking construction, and in particular to a soil drag reduction and lubrication device for box-type pipe jacking construction. Background Technology

[0002] Pipe jacking is a widely used method for trenchless underground pipeline laying, offering advantages such as low vibration, low noise, and minimal impact on traffic. Closed-loop pipe jacking can traverse strata below the groundwater level without the need for dewatering. Pipe jacking construction requires the verification of locations and the construction of launching and receiving shafts. Launching shafts are often enclosed box-type structures with internal frame support. The pipe jacking equipment is installed inside the shaft. During pipe jacking, as the resistance between the pipe and the external soil increases, a grouting pump is used to inject well-mixed thixotropic slurry around the pipe ring to form a grouting layer. To address this issue, the inventors discovered in practice that the grouting nozzles used for grouting are easily blocked by the soil when moving with the pipe ring. Since multiple nozzles are used and the grouting pressure is constant, other nozzles can be used normally, but the nozzle in this particular area cannot grout. This results in insufficient reduction of friction between the pipe ring and the soil in that area, potentially causing the pipe ring to deviate or become difficult to advance during the jacking process. Therefore, a soil drag reduction and lubrication device for box-type pipe jacking construction is proposed to address these problems. Utility Model Content

[0003] In view of the above-mentioned problems in the prior art, the main purpose of this utility model is to provide a soil drag reduction and lubrication device for box-type pipe jacking construction. By opening the first solenoid valve of this part separately, the internal pressure of the discharge nozzle on this side increases, which helps to flush out the soil blocking the discharge nozzle, ensures the discharge of thixotropic mud, ensures the smooth jacking operation of the top ring, and reduces the deviation of the top ring to a certain extent.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a soil drag reduction and lubrication device for box-type pipe jacking construction, comprising grouting equipment, injection pipe and drag reduction and lubrication mechanism;

[0005] The output end of the grouting equipment is connected to an injection pipe, and the other end of the injection pipe is connected to a drag-reducing lubrication mechanism to reduce the resistance between the outside of the pipe and the soil.

[0006] The drag-reducing lubrication mechanism includes a ring-shaped support hollow ring. One side of the support hollow ring is connected to an injection pipe, and the other side of the support hollow ring is connected to multiple sets of evenly distributed connecting pipes. The other end of each connecting pipe is connected to a solid support ring, and evenly distributed discharge nozzles are installed on the outer side of the solid support ring.

[0007] Furthermore, the solid support ring has evenly distributed hollow chambers inside, and the connecting pipe is connected to the hollow chambers of the solid support ring.

[0008] Furthermore, flow meters are installed in the hollow chamber areas inside the solid support ring.

[0009] Furthermore, a first solenoid valve is installed on the outside of each connecting pipe.

[0010] Furthermore, the solid support ring is made of metal steel.

[0011] Pipe jacking is a widely used method for trenchless underground pipeline laying, offering advantages such as low vibration, low noise, and minimal impact on traffic. Closed-loop pipe jacking can traverse strata below the groundwater level without dewatering. Pipe jacking construction requires the verification of locations and the construction of launching and receiving shafts. Launching shafts are often enclosed box-type structures with internal frame supports, where the pipe jacking equipment is installed. During pipe jacking, the resistance between the pipe and the external soil increases. At this point, a grouting pump is used to inject well-mixed thixotropic slurry around the pipe ring, forming a slurry sleeve to reduce the resistance between the pipe ring and the soil. The inventors discovered in practical operation that the grouting nozzles used for grouting are easily blocked by soil as they move with the pipe ring. Furthermore, due to the use of multiple grouting nozzles, the grouting pressure... With constant force, other grouting nozzles can be used normally, but the grouting nozzle in this area cannot grout. This results in the friction between the pipe ring and the soil in this area not being effectively reduced, which may cause the pipe ring to shift or make jacking difficult during the jacking process. When in use, an external power supply is used. The hollow support ring and the solid support ring are connected by a connecting pipe. A first solenoid valve is installed on the outside of each connecting pipe. The first solenoid valve controls the discharge of thixotropic mud independently. If soil blocks the discharge nozzle, the first solenoid valve in this area is opened. At this time, the pressure increases, which helps to flush out the soil blocking the discharge nozzle, ensuring the discharge of thixotropic mud and ensuring that the jacking ring can be jacked smoothly. This also reduces the deviation of the jacking ring to a certain extent.

[0012] Furthermore, the input end of the grouting equipment is connected to an input pipe, and the other end of the input pipe is connected to two sets of branch pipes, the other ends of which are immersed in the thixotropic mud storage tank.

[0013] Furthermore, the thixotropic mud storage tank is equipped with two chambers for storing thixotropic mud, and the two sets of pipes are respectively inserted into the internal chambers of the thixotropic mud storage tank.

[0014] Furthermore, a second solenoid valve is installed on the outside of each branch pipe.

[0015] The thixotropic mud storage tank has two chambers inside, which store thixotropic mud separately. If the thixotropic mud is insufficient, the thixotropic mud material in the other chamber can be replenished by opening a second set of solenoid valves, ensuring continuous operation and maintaining work efficiency.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] The hollow and solid support rings are connected by a connecting pipe, and a first solenoid valve is installed on the outside of each connecting pipe. The discharge of thixotropic mud is controlled by the first solenoid valve. If soil blocks the discharge nozzle, the first solenoid valve in that part is opened. At this time, the pressure increases, which helps to flush out the soil blocking the discharge nozzle, ensuring the discharge of thixotropic mud and ensuring the smooth jacking operation of the top ring, and reducing the deviation of the top ring to a certain extent.

[0018] The thixotropic mud storage tank has two chambers inside, which store thixotropic mud separately. If the thixotropic mud is insufficient, the thixotropic mud material in the other chamber can be replenished by opening a second set of solenoid valves, ensuring continuous operation and maintaining work efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the drag reduction and lubrication mechanism of this utility model;

[0021] Figure 3 This is a cross-sectional view of the solid ring of this utility model.

[0022] Legend: 1. Grouting equipment; 2. Injection pipe; 3. Drag reduction and lubrication mechanism; 301. Supporting hollow ring; 302. Connecting pipe; 303. Solid support ring; 304. Hollow chamber; 305. Discharge nozzle; 306. First solenoid valve; 4. Input pipe; 5. Branch pipe; 6. Second solenoid valve; 7. Thixotropic mud storage tank. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0024] Example

[0025] A soil drag reduction and lubrication device for box-type pipe jacking construction, such as Figure 1-3 As shown, it includes grouting equipment 1, injection pipe 2, and drag-reducing lubrication mechanism 3;

[0026] The output end of the grouting equipment 1 is connected to the injection pipe 2, and the other end of the injection pipe 2 is connected to the drag reduction and lubrication mechanism 3 for reducing the resistance between the outside of the pipe and the soil.

[0027] The drag reduction and lubrication mechanism 3 includes a ring-shaped support hollow ring 301. One side of the support hollow ring 301 is connected to the injection pipe 2, and the other side of the support hollow ring 301 is connected to multiple sets of evenly distributed connecting pipes 302. The other end of each connecting pipe 302 is connected to a solid support ring 303, and evenly distributed discharge nozzles 305 are installed on the outer side of the solid support ring 303.

[0028] The solid support ring 303 has uniformly distributed hollow chambers 304 inside, and the connecting pipe 302 is connected to the hollow chambers 304 of the solid support ring 303.

[0029] Flow meters are installed in the hollow chamber 304 area inside the solid support ring 303.

[0030] A first solenoid valve 306 is installed on the outside of the connecting pipe 302.

[0031] The solid support ring 303 is made of metal steel.

[0032] Pipe jacking is a widely used method for trenchless underground pipeline laying, offering advantages such as low vibration, low noise, and minimal impact on traffic. Closed-loop pipe jacking can traverse strata below the groundwater level without dewatering. Pipe jacking construction requires the verification of locations and the construction of launching and receiving shafts. Launching shafts are often enclosed box-type structures with internal frame support, where the pipe jacking equipment is installed. During pipe jacking, the resistance between the pipe and the external soil increases. At this point, a grouting pump is used to inject well-mixed thixotropic slurry around the pipe ring, forming a slurry sleeve to reduce the resistance between the pipe ring and the soil. The inventors discovered in practical operation that the grouting nozzles used for grouting are easily blocked by soil when moving with the pipe ring. However, because multiple grouting nozzles are used, the grouting pressure is constant, allowing other nozzles to... Normal use is possible, but the grouting nozzle in this area cannot inject grout, which leads to the friction between the pipe ring and the soil in this area not being effectively reduced. This may cause the pipe ring to deviate or make jacking difficult during the jacking process. When in use, an external power supply is used. The hollow support ring 301 and the solid support ring 303 are connected by a connecting pipe 302. A first solenoid valve 306 is installed on the outside of each connecting pipe 302. The first solenoid valve 306 controls the discharge of thixotropic mud. If soil blocks the discharge nozzle 305, the first solenoid valve 306 in this area is opened separately. At this time, the pressure increases, which helps to flush out the soil blocking the discharge nozzle 305, ensuring the discharge of thixotropic mud and ensuring that the jacking ring can be jacked smoothly. This also reduces the deviation of the jacking ring to a certain extent.

[0033] In this embodiment, a flow meter is installed in each of the hollow chambers 304. The flow meter can be used to determine the discharge status of the thixotropic mud. If the flow meter value stops moving, it indicates that the discharge nozzle 305 is blocked. Then, the signal is sent to the external control unit, which executes the above steps to clear the discharge nozzle 305.

[0034] The solid support ring 303 is installed inside the jacking pipe and is made of metal steel. It can play a certain role in supporting the jacking pipe.

[0035] The grouting equipment 1 has an input pipe 4 connected to its input end, and two sets of branch pipes 5 connected to the other end of the input pipe 4. The other ends of the branch pipes 5 are immersed in the thixotropic mud storage tank 7.

[0036] The thixotropic mud storage tank 7 has two chambers for storing thixotropic mud, and the two sets of pipes 5 are respectively inserted into the internal chambers of the thixotropic mud storage tank 7.

[0037] A second solenoid valve 6 is installed on the outer side of each branch pipe 5.

[0038] The thixotropic mud storage tank 7 has two chambers inside, which store thixotropic mud separately. If the thixotropic mud is insufficient, the thixotropic mud material in the other chamber can be supplied normally by opening another set of second solenoid valves 6, so as to replenish the insufficient thixotropic mud chamber, ensure the continuous operation of the work and guarantee work efficiency.

[0039] Finally, it should be noted that the above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A soil drag reduction and lubrication device for box-type pipe jacking construction, characterized in that: It includes grouting equipment (1), injection pipe (2) and drag reduction and lubrication mechanism (3); The output end of the grouting equipment (1) is connected to the injection pipe (2), and the other end of the injection pipe (2) is connected to the drag reduction and lubrication mechanism (3) for reducing the resistance between the outside of the pipe and the soil. The drag reduction and lubrication mechanism (3) includes a support hollow ring (301) arranged in a ring shape. One side of the support hollow ring (301) is connected to the injection pipe (2), and the other side of the support hollow ring (301) is connected to multiple sets of evenly distributed connecting pipes (302). The other end of each connecting pipe (302) is connected to a solid support ring (303), and evenly distributed discharge nozzles (305) are installed on the outside of the solid support ring (303).

2. The box-type pipe jacking construction soil resistance reduction and lubrication device according to claim 1, characterized in that: The solid support ring (303) has uniformly distributed hollow chambers (304) inside, and the connecting pipe (302) is connected to the hollow chambers (304) of the solid support ring (303).

3. The box-type pipe jacking construction soil resistance reduction and lubrication device according to claim 1, characterized in that: Flow meters are installed in the hollow chamber (304) area inside the solid support ring (303).

4. The box-type pipe jacking construction soil resistance reduction and lubrication device according to claim 1, characterized in that: A first solenoid valve (306) is installed on the outside of the connecting pipe (302).

5. The box-type pipe jacking construction soil resistance reduction and lubrication device according to claim 1, characterized in that: The solid support ring (303) is made of metal steel.

6. The box-type pipe jacking construction soil resistance reduction and lubrication device according to claim 1, characterized in that: The grouting equipment (1) has an input pipe (4) connected to its input end, and two sets of pipes (5) connected to the other end of the input pipe (4). The other end of the pipes (5) is immersed in the thixotropic mud storage tank (7).

7. The box-type pipe jacking construction soil resistance reduction and lubrication device according to claim 6, characterized in that: The thixotropic mud storage tank (7) has two chambers for storing thixotropic mud, and the two sets of pipes (5) are respectively inserted into the internal chambers of the thixotropic mud storage tank (7).

8. The box-type pipe jacking construction soil resistance reduction and lubrication device according to claim 6, characterized in that: A second solenoid valve (6) is installed on the outside of the branch pipe (5).

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