Mud balance type pipe jacking cutter plate suitable for high permeability stratum

Abstract

The utility model discloses a mud balance formula pipe jacking cutter head of adapting high permeation stratum, including ring body and fixed ring, be equipped with the first supporting arm and second supporting arm of fixed connection between fixed ring and ring body, and the first supporting arm and second supporting arm interval arrangement, the second supporting arm both sides are equipped with the fixed connection of third supporting arm, and the first supporting arm both sides are equipped with the fixed connection of third supporting arm, and third supporting arm fixed connection ring body, be equipped with first drill and mill cutter on the first supporting arm, be equipped with first drill and mill cutter and second drill and mill cutter on the second supporting arm, be equipped with water injection hole on the first supporting arm and second supporting arm, be equipped with the center cutter of fixed bolt through on fixed ring, be equipped with second drill and mill cutter on the center cutter, the both sides of third supporting arm are equipped with strip sealing plate and sector sealing plate respectively, and sector sealing plate, strip sealing plate fixed connection third supporting arm and ring body, the utility model discloses through sector sealing plate, strip sealing plate and baffle to the cutter head opening is closed, reduces the amount of opening, thereby reduces the slurry output of silt, avoids the road subsidence.

Description

Technical Field

[0001] This utility model belongs to the field of road construction technology, and specifically relates to a mud-water balance cutterhead adapted to high-permeability strata. Background Technology

[0002] Pipe jacking is a common method for underground pipeline construction. Pipe jacking can quickly open up underground pipelines, avoiding the construction drawbacks of traditional excavation and pre-embedding methods.

[0003] At the same time, depending on the different strata detected, different tunneling cutterheads will be used to equip the pipe jacking machine in order to improve construction efficiency;

[0004] Our company has encountered the following problems during the construction of recent projects: In the early stages of construction, it was found that the soil layer had a high sand content during the jacking process, which was inconsistent with the geological survey report. The amount of slurry discharged during the pipe jacking process was significantly greater than the theoretical amount. Even with the use of a targeted cutterhead, this phenomenon continued to occur, and the road surface showed varying degrees of settlement. In order to reduce the amount of slurry discharged during the pipe jacking process and avoid road settlement, it is necessary to take measures to control the amount of sand discharged, reduce the amount of sand discharged, and avoid the collapse of the subgrade due to excessive sand discharge, which would lead to road settlement.

[0005] Our company's previous patent application, CN 112012757 B, describes a slurry-balanced pipe jacking machine and its construction process in quicksand strata. However, even after using the above equipment for construction, the problem of excessive slurry discharge remains difficult to alleviate.

[0006] Therefore, in response to the above problems, the applicant made technical improvements based on actual construction needs. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a slurry-balanced pipe jacking cutterhead adapted to high-permeability strata. By sealing the cutterhead openings with fan-shaped sealing plates, strip sealing plates, and baffle plates, the amount of openings is reduced, thereby reducing the amount of slurry produced and preventing road subsidence.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0009] A mud-water balanced pipe jacking cutterhead adapted to high-permeability formations includes a ring body and a fixed ring. A first arm and a second arm are fixedly connected between the fixed ring and the ring body, and the first arm and the second arm are spaced apart. A third arm is fixedly connected to both sides of the second arm and the first arm, and the third arm is fixedly connected to the ring body. A first drill cutter is provided on the first arm. A first drill cutter and a second drill cutter are provided on the second arm. Water injection holes are provided on the first arm and the second arm. A central cutterhead is fixed to the fixed ring by bolts, and a second drill cutter is provided on the central cutterhead.

[0010] The third arm is provided with strip-shaped sealing plates and fan-shaped sealing plates on both sides, and the fan-shaped sealing plates and strip-shaped sealing plates are fixedly connected to the third arm and the ring body; furthermore, the first arm is provided with fixedly connected baffle plates on both sides, and the second arm is also provided with fixedly connected baffle plates on both sides, and the baffle plates are fixedly connected to the strip-shaped sealing plates and fan-shaped sealing plates; the gaps between the first arm, the second arm and the third arm are sealed by the strip-shaped sealing plates, the fan-shaped sealing plates and the baffle plates, thereby reducing the amount of openings in the cutter head and reducing and controlling the amount of sand output.

[0011] The second drilling and milling cutter is provided with cutting teeth. In this technical solution, the first drilling and milling cutter and the second drilling and milling cutter have the same structural features.

[0012] The water injection hole on the first arm is located at one end near the fixing ring.

[0013] The water injection hole on the second arm is located at one end near the ring body.

[0014] The first and second drill cutters on the second arm are set at a 90° angle.

[0015] The first and second drill cutters on the second arm are spaced apart.

[0016] The ring body is provided with evenly spaced second drill and milling cutters.

[0017] The advantages of this utility model compared with the prior art are as follows:

[0018] To address the issue of slurry output significantly exceeding theoretical output during pipe jacking in soil layers with high sand content, strip-shaped sealing plates, fan-shaped sealing plates, and baffles are used to seal the openings on the cutterhead, thereby reducing the amount of slurry output. In addition, bentonite slurry is injected through water injection holes. The low-viscosity bentonite slurry is injected into the working face through the water injection holes on the cutterhead panel, reducing the cutterhead torque, reducing jacking resistance, increasing jacking speed, and quickly passing through the quicksand layer, preventing excessive sand extraction.

[0019] Specifically, strip-shaped and fan-shaped sealing plates are used to seal the large triangular and elongated areas of the openings on the cutterhead. Baffle plates are used to further seal the strip-shaped openings on both sides of the first and second arms. This can prevent the openings from being too large, allowing too much flowing sand to enter the machine head, and causing excessive sand extraction during the pipe jacking process, which could lead to road subsidence. Attached Figure Description

[0020] Appendix Figure 1 This is a schematic diagram of the original cutter head structure. Figure 1 ;

[0021] Appendix Figure 2 This is a schematic diagram of the original cutter head structure. Figure 2 ;

[0022] Appendix Figure 3 This is a schematic diagram of a mud-water balance cutterhead structure adapted to high-permeability formations according to this utility model. Figure 1 ;

[0023] Appendix Figure 4 This is a schematic diagram of a mud-water balance cutterhead structure adapted to high-permeability formations according to this utility model. Figure 2 ;

[0024] In the diagram: 1. Ring body; 2. First arm; 3. Second arm; 4. First drill cutter; 5. Second drill cutter; 51. Cutting tooth; 6. Water injection hole; 7. Third arm; 71. Strip sealing plate; 72. Fan-shaped sealing plate; 8. Central cutter head; 9. Baffle plate; 10. Fixing ring. Detailed Implementation

[0025] To facilitate understanding by those skilled in the art, the following is a detailed explanation in conjunction with the appendix. Figure 1-4 The technical solution of this utility model will be further described in detail below.

[0026] A slurry-balanced pipe jacking cutterhead adapted to high-permeability formations includes a ring body 1 and a fixed ring 10. A first support arm 2 and a second support arm 3 are fixedly connected between the fixed ring 10 and the ring body 1, with the first support arm 2 and the second support arm 3 spaced apart. Third support arms 7 are fixedly connected to both sides of the second support arm 3, and the third support arms 7 are fixedly connected to both sides of the first support arm 2. The third support arms 7 are fixedly connected to the ring body 1. A first drill cutter 4 is provided on the first support arm 2. A first drill cutter 4 and a second drill cutter 5 are provided on the second support arm 3. Water injection holes 6 are provided on the first support arm 2 and the second support arm 3. In this embodiment, the water injection holes 6 are used to inject bentonite slurry, and a water injection pipe is connected to the outside of the water injection holes 6. A central cutterhead 8, fixed by bolts, is provided on the fixed ring 10, and a second drill cutter 5 is provided on the central cutterhead 8.

[0027] The third support arm 7 is provided with a strip-shaped sealing plate 71 and a fan-shaped sealing plate 72 on both sides, and the fan-shaped sealing plate 72 and the strip-shaped sealing plate 71 are fixedly connected to the third support arm 7 and the ring body 1; furthermore, the first support arm 2 is provided with a fixedly connected baffle plate 9 on both sides, and the second support arm 3 is also provided with a fixedly connected baffle plate 9 on both sides, and the baffle plate 9 is fixedly connected to the strip-shaped sealing plate 71 and the fan-shaped sealing plate 72; the openings between the first support arm 2, the second support arm 3, and the third support arm 7 are sealed by the strip-shaped sealing plate 71, the fan-shaped sealing plate 72, and the baffle plate 9, thereby reducing the amount of openings in the cutter head and reducing and controlling the amount of sand output.

[0028] The second drilling and milling cutter 5 is provided with cutting teeth 51. In this technical solution, the first drilling and milling cutter 4 and the second drilling and milling cutter 5 have the same structural features.

[0029] The water injection hole 6 on the first support arm 2 is located at one end near the fixing ring 10.

[0030] The water injection hole 6 on the second arm 3 is located at one end near the ring body 1.

[0031] The first drill cutter 4 and the second drill cutter 5 on the second support arm 3 are set at 90°.

[0032] The first drill cutter 4 and the second drill cutter 5 on the second support arm 3 are spaced apart.

[0033] The ring body 1 is provided with evenly spaced second drill and milling cutters 5.

[0034] A slurry-balanced cutterhead adapted to high-permeability formations operates as follows:

[0035] For soil layers with high sand content, the amount of slurry produced during pipe jacking is significantly greater than the theoretical amount. To reduce the amount of slurry produced, the openings on the cutterhead are sealed by strip sealing plates 71, fan-shaped sealing plates 72, and baffle plates 9 to reduce the amount of slurry produced. In addition, bentonite slurry is injected through the water injection holes 6. The bentonite slurry with low viscosity is injected into the working face through the water injection holes 6 on the cutterhead panel to reduce the cutterhead torque, reduce the jacking resistance, increase the jacking speed, quickly pass through the quicksand layer, and prevent excessive sand extraction.

[0036] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this invention, the connection methods are divided into fixed connection and movable connection. Fixed connection methods include, but are not limited to, welding and bolting; movable connection methods include, but are not limited to, sliding connection, rotating connection and threaded connection. The connection method to achieve the desired effect should be selected according to the application of the solution.

[0038] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A slurry-balanced pipe jacking cutterhead adapted to high-permeability formations, comprising a ring body and a fixed ring, wherein a first support arm and a second support arm are fixedly connected between the fixed ring and the ring body, and the first support arm and the second support arm are spaced apart; characterized in that The second support arm is provided with a third support arm fixedly connected to both sides, and the first support arm is provided with a third support arm fixedly connected to both sides. The third support arm is fixedly connected to a ring body. The first support arm is provided with a first drilling and milling cutter. The second support arm is provided with a first drilling and milling cutter and a second drilling and milling cutter. The first support arm and the second support arm are provided with water injection holes. The fixed ring is provided with a central cutter head fixed by bolts, and the central cutter head is provided with a second drilling and milling cutter. The third arm is provided with a strip-shaped sealing plate and a fan-shaped sealing plate on both sides, and the fan-shaped sealing plate and the strip-shaped sealing plate are fixedly connected to the third arm and the ring body; furthermore, the first arm is provided with a fixedly connected baffle plate on both sides, and the second arm is also provided with a fixedly connected baffle plate on both sides, and the baffle plate is fixedly connected to the strip-shaped sealing plate and the fan-shaped sealing plate.

2. The slurry-balanced cutterhead adapted to high-permeability formations according to claim 1, characterized in that... The second drilling and milling cutter is provided with cutting teeth, and the first drilling and milling cutter and the second drilling and milling cutter have the same structural features.

3. A slurry-balanced cutterhead adapted to high-permeability formations according to claim 1, characterized in that... The water injection hole on the first arm is located at one end near the fixing ring.

4. A slurry-balanced cutterhead adapted to high-permeability formations according to claim 1, characterized in that... The water injection hole on the second arm is located at one end near the ring body.

5. A slurry-balanced cutterhead adapted to high-permeability formations according to claim 1, characterized in that... The first and second drill cutters on the second arm are set at a 90° angle.

6. A slurry-balanced cutterhead adapted to high-permeability formations according to claim 1, characterized in that... The first and second drill cutters on the second arm are spaced apart.

7. A slurry-balanced cutterhead adapted to high-permeability formations according to claim 1, characterized in that... The ring body is provided with evenly spaced second drill and milling cutters.

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