Slurry balance pipe jacking construction device and construction method thereof

Abstract

The invention discloses a slurry balance pipe jacking construction device and a construction method thereof.The slurry balance pipe jacking construction device comprises a jacking assembly, a to-be-jacked pipeline assembly and a slurry balance system, the jacking assembly is installed in a starting well, the to-be-jacked pipeline assembly comprises a plurality of to-be-jacked pipelines which are sequentially arranged in an end-to-end tight butt joint mode, and the slurry balance pipe jacking construction device further comprises an auxiliary positioning assembly and a tool pipe; the auxiliary positioning assembly is installed in a starting well and used for assisting the jacking assembly in the moving path of jacking of the tool pipe and a to-be-jacked pipeline, the tool pipe comprises a shell, a muddy water bin and a working bin are arranged in the shell, the muddy water bin is connected with a muddy water balance system and used for stabilizing the pressure of the front end of the tool pipe, and a cutter head assembly is arranged at the front end of the muddy water bin. According to the cutterhead assembly, the single reinforced cutterhead or the single composite cutterhead can be switched according to the soil texture condition of a construction road section to be jacked, and the single reinforced cutterhead or the single composite cutterhead can be switched according to different soil texture conditions, so that the cutterhead assembly adapts to various complex soil texture conditions, the construction efficiency is improved, part of cutter heads are protected, and the service life of the corresponding cutter heads is prolonged.

Description

Technical Field

[0001] The invention relates to a mud-water balance pipe jacking construction device and a construction method thereof. Background Art

[0002] Mud-water balance pipe jacking construction is a trenchless construction method, a pre-buried pipe construction technology with no or minimal excavation. Pipe jacking construction is to use the jacking force generated by the jacking equipment in the working pit to overcome the friction between the pipe and the surrounding soil, push the pipe into the soil according to the set slope, and transport the soil away. The pipe jacking machine generally has a cutter head installed on the head, and the cutter head is driven by a motor to dig the soil and move forward.

[0003] Most existing slurry-balanced pipe jacking machines have a single cutter head. During the excavation process, different soil conditions may be encountered at different construction intervals. A single cutter head sometimes cannot adapt to complex soil conditions and is prone to aggravating the wear of the cutting head, reducing its service life. When the cutter head is temporarily replaced at the construction site, it can only be replaced by large excavation or manual excavation to lift the head out, which increases the construction cost and construction period. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a slurry-balanced pipe jacking construction device, which can form a single reinforced cutter disc or a composite cutter disc through the rotation of an auxiliary disc and a rotating disc according to different soil conditions, thereby adapting to various complex soil conditions, improving construction efficiency, protecting part of the cutter head, and increasing the service life of the corresponding cutter head; a construction method is also provided.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a slurry-balanced pipe jacking construction device, including a jacking component, a pipe component to be jacked, and a slurry-balance system. The jacking component is installed in a starting well, and the pipe component to be jacked includes a plurality of pipes to be jacked that are tightly butt-jointed end to end in sequence. The device also includes an auxiliary positioning component and a tool pipe. The auxiliary positioning component is installed in the starting well and is used to assist the jacking component in jacking the tool pipe and the pipe to be jacked into a moving path. The tool pipe includes a shell, and a slurry bin and a working bin are provided in the shell. The slurry bin is connected to the slurry-balance system to stabilize the pressure at the front end of the tool pipe. A cutterhead assembly is provided at the front end of the slurry bin. The cutterhead assembly can switch between a single reinforced cutterhead or a composite cutterhead according to the soil conditions of the construction section to be jacked.

[0006] Furthermore, the cutter disc assembly includes a rotating disc, an inner end surface of the rotating disc is provided with a concave cavity and a main driving rod is connected to the center, the end of the main driving rod transversely penetrates the mud and water bin and is arranged in the working bin and is equipped with a driving motor, and the outer end surface of the rotating disc is provided with a center knife, multiple groups of cutting knives, multiple mud inlets and multiple rectangular openings, the center knife is arranged at the center of the rotating disc, the multiple groups of cutting knives and the multiple rectangular openings are distributed along the central circumference of the rotating disc, the multiple mud inlets are irregularly distributed on the rotating disc, and the rectangular openings are for the tools on the auxiliary disc to extend to form a single reinforced cutter disc or a composite cutter disc.

[0007] Furthermore, a special-shaped groove is provided in the center of the auxiliary disk, and the end face of the special-shaped groove is connected to the rotating member through a reinforcing rib, and the end of the rotating member is rotatably connected to the rotating disk, and the rotating member is used to drive the auxiliary disk to rotate to realize the switching of the tool, and corresponding telescopic abutment blocks and guide cavities are provided corresponding to the multiple rectangular openings on the auxiliary disk, and a slidingly connected roller cutter group is provided in the guide cavity, the roller cutter group is connected to the moving member and the moving member is used to drive the roller cutter group to extend to the rectangular opening, the moving member is arranged in the rotating member, and the ends of the moving member and the rotating member both transversely penetrate the mud and water bin and are arranged in the working bin and are independently equipped with a driving member.

[0008] Furthermore, the rotating member includes a first sleeve, which is arranged at the end of the working chamber and is provided with a driven gear, the driven gear is meshed with a driving gear, the rotation of the driving gear drives the driven gear to rotate, and then drives the auxiliary disk to rotate to realize the switching of the telescopic abutment block and the hob group, and the first sleeve is symmetrically provided with rectangular through grooves, and the rectangular through grooves are used for guiding the sliding of the moving member.

[0009] Furthermore, the movable member includes a second sleeve slidably connected in the first sleeve, the second sleeve is provided with a sliding block corresponding to the rectangular through groove, the sliding block is connected to the movable sleeve, and the outer end surface of the movable sleeve is provided with a pushing connecting rod corresponding to the hob assembly.

[0010] Furthermore, a locking piece is provided between the second sleeve and the main driving rod, and the locking piece is used to link the second sleeve and the main driving rod to rotate synchronously. The locking piece includes a sliding base provided on the main driving rod, and the sliding base is connected to the second sleeve. The sliding base is provided with a telescopic clamping part for controlling the sliding of an electromagnet, and the telescopic clamping part includes an engaged section and a non-engaged section. The inner end surface of the second sleeve is provided with internal teeth, and when the electromagnet is not energized, the engaging section engages with the internal teeth.

[0011] Furthermore, the auxiliary positioning component includes a first base, the first base is provided with a cavity and the upper end face is arc-shaped, the arc-shaped end face is formed with multiple ribs by opening multiple through grooves, a guide groove is provided at the bottom of the cavity, a telescopic base is slidably connected in the cavity, the telescopic base is provided with raised ribs corresponding to the through grooves, and the ribs are provided with pressure sensors and configured with sound prompts.

[0012] Furthermore, both sides of the first base are provided with slots, the sides of the telescopic base are correspondingly provided with extension blocks and the extension blocks are provided with slide grooves, the slide grooves are provided with anti-rotation parts, and the anti-rotation parts are used to limit the rotation of the tool tube shell when the tool tube is initially pushed into the hole.

[0013] The present application also provides a construction method, which is characterized by comprising the following steps:

[0014] S1: Construction of mud balance system;

[0015] S2: Construction of the launching well;

[0016] S3: Construction of receiving well;

[0017] S4: Auxiliary positioning components, back wall installation and jacking components are installed in the launch shaft;

[0018] S4: Jacking of tool pipe and pipeline components to be jacked

[0019] The tool pipe is pushed forward along the auxiliary positioning component by using the jacking component. The attached cutterhead component of the tool pipe determines the soil conditions of the road section and the distance nodes of different soils before construction, and then rotates and moves accordingly to form a single cutterhead or a composite cutterhead with the first cutterhead component to enter the soil layer, excavate the soil, and mix it with the mud in the mud and water bin and discharge it through the slurry discharge system; after the tunnel boring machine completely enters the soil layer, the cable and mud pipe are removed, and the first section of the pipeline to be jacked is hoisted down and pushed to the tail sleeve of the tunnel boring machine. After the connecting pipe of the tunnel boring head is jacked, the excavation is terminated and the hydraulic pressure is slowly retracted. Another section of the pipeline to be jacked is hoisted into the well again, and it is sleeved behind the first section of the pipeline to be jacked. They are connected together and jacked again. The process is repeated until all the pipelines to be jacked are pushed into the soil layer and a permanent underground pipeline is completed;

[0020] S5: grouting;

[0021] S6: Tool pipe enters receiving well

[0022] After the tool pipe enters the receiving well as a whole, the machine head and the pipeline to be pushed in are immediately separated to complete the construction.

[0023] Beneficial effects:

[0024] 1. The present application arranges a rotating disk and an auxiliary disk. A telescopic abutment block and a roller cutter group are arranged on the auxiliary disk. The auxiliary disk is driven by a rotating member to realize a 36° rotation to realize a switching of the telescopic abutment block and the roller cutter group. Each rotation of 36 degrees realizes the switching of the cutter, thereby being able to adapt to the soil conditions on different construction sections and improve construction efficiency. At the same time, the use of the cutter is more rational, the cutter is effectively protected from severe wear, and the service life of the cutter is extended.

[0025] 2. The present application is also provided with an auxiliary positioning component, which can assist in the jacking path of the tool pipe and the pipe to be jacked, ensure that the tool pipe and the pipe to be jacked are jacked on the same horizontal pipeline, improve the construction quality, and at the same time, the auxiliary positioning component is miniaturized, and the extension length of the telescopic base can be adjusted according to the width of the starting well. It can be retracted when not in use, which reduces space occupancy and facilitates transportation, avoiding the scattering of guide rail splicing parts in the prior art, and the need to rebuild the frame for subsequent use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the construction device;

[0027] Figure 2 It is a three-dimensional schematic diagram of the construction device;

[0028] Figure 3 is a schematic diagram of an auxiliary positioning member;

[0029] Figure 4 It is a schematic diagram of the interior of the tool tube;

[0030] Figure 5 It is a schematic diagram of the auxiliary disk;

[0031] Figure 6 Schematic diagram of the rotating disk.

[0032] Figure numerals: 1, jacking assembly; 2, pipeline assembly to be jacked; 21, pipeline to be jacked; 3, auxiliary positioning assembly; 31, first base; 32, cavity; 33, rib plate; 34, telescopic base; 35, pressure sensor; 4, tool pipe; 41, shell; 42, mud and water bin; 43, working bin; 5, cutter head assembly; 51, rotating disk; 52, main driving rod; 53, center knife; 54, cutting knife; 55, mud inlet; 56, rectangular opening; 6, auxiliary disk; 61, Special-shaped groove; 62, telescopic abutment block; 63, guide cavity; 64, hob unit; 7, rotating member; 71, first sleeve; 72, driven gear; 73, driving gear; 74, rectangular through groove; 8, moving member; 81, second sleeve; 82, sliding block; 83, moving sleeve; 84, push connecting rod; 9, locking member; 91, electromagnet; 92, telescopic clamping part; 93, internal tooth pattern; 94, sliding base; 10, slotting; 11, extension block; 12, anti-rotation member. DETAILED DESCRIPTION

[0033] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0034] Refer to Figure 1-Figure 6As shown, the present application provides a mud-water balance pipe jacking construction device, which includes a jacking component 1, a pipe 21 component to be jacked 2, a mud-water balance system, an auxiliary positioning component 3 and a tool pipe 4; the tool pipe 4 includes a shell 41, a mud-water bin 42 and a working bin 43 are arranged in the shell 41, and the mud-water balance system is connected to the mud-water bin 42 so that a certain pressure is established in the mud-water bin 42 to ensure that the excavation work of the tool pipe 4 is carried out stably. The mud-water balance system includes a mud pool, a mud discharge pipe and a mud inlet and water inlet pipe. The mud inlet and water inlet pipe and the mud discharge pipe are connected to the mud-water bin 42 through a pump body, so that the water and soil in the mud-water bin 42 are mixed with mud and water to form slurry, and the slurry is discharged through the mud discharge pipe. Since the mud-water balance system is a prior art, it will not be described in detail here. The jacking assembly 1 and the auxiliary positioning assembly 3 are installed in the starting well. The jacking assembly 1 includes a back wall, a mounting bracket and a jack arranged on the mounting bracket. Preferably, there are 4 groups of jacks. The telescopic ends of the jacks are commonly connected with an annular jacking iron. The back wall is used to provide a reaction force for the jack when jacking the pipeline. It always bears the recoil force of the jack when jacking the pipeline forward during the jacking process and has sufficient strength and rigidity.

[0035] Refer to Figure 2 , Figure 3 As shown, the auxiliary positioning component 3 includes a first base 31, the first base 31 is provided with a cavity 32, and the upper end surface of the cavity 32 is arc-shaped, and the arc-shaped end surface forms a plurality of ribs 33 by opening a plurality of through grooves, and a guide groove is provided at the bottom of the cavity 32. A telescopic base 34 is slidably connected in the cavity 32, and the telescopic base 34 is used to extend the auxiliary path. The telescopic base 34 is provided with a raised rib 33 corresponding to the through groove, and the ribs 33 are provided with pressure sensors 35 and are configured with sound prompts. When the tool pipe 4 or the pipe 21 to be pushed in is not placed accurately, the pressure received by the pressure sensor 35 on the rib 33 will be uneven or no pressure information will be received, so a sound prompt will be generated, indicating that the position of the tool pipe 4 or the pipe 21 to be pushed in needs to be readjusted.

[0036] In order to prevent the tool pipe 4 shell 41 from rotating due to various reasons during the process of pushing the tool pipe 4 into the hole, the current existing technology will fix the tool pipe 4 by welding and then push it into the hole through a jack. After the pushing is completed, the weld is cut off and the pushing is continued. Then the pipeline 21 to be pushed in is lowered and connected to the tail of the tool pipe 4 and pushed in through the jack, and it is repeated until the tool pipe 4 enters the receiving well. The present application believes that the welding method and steps are relatively cumbersome, and it is necessary to pay attention to welding cutting at all times to prevent affecting the subsequent pushing work. Therefore, slots 10 are provided on both sides of the first base 31, and extension blocks 11 are correspondingly provided on the sides of the telescopic base 34, and a slide groove is provided on the extension block 11, and an anti-rotation part 12 is provided on the slide groove. The anti-rotation part 12 is used to limit the rotation of the tool tube 4 shell 41 when the tool tube 4 is initially pushed into the hole. The anti-rotation part 12 includes an arc plate, an adjustment rod at the bottom of the arc plate, and a rubber layer is provided on the outer end surface of the arc plate facing the tool tube 4. The adjustment rod is used to adjust the degree of clamping of the arc plate on the tool tube 4, and the rotation of the tool tube 4 is further limited by the rubber layer.

[0037] Refer to Figure 4-Figure 6As shown, a cutter disc assembly 5 is provided at the front end of the cement silo, and the cutter disc assembly 5 includes a rotating disc 51. A concave cavity is provided on the inner end surface of the rotating disc 51 and a main driving rod 52 is connected to the center. The end of the main driving rod 52 transversely penetrates the mud and water bin 42 and is arranged in the working bin 43 and is equipped with a driving motor. A center knife 53, multiple groups of cutting knives 54, multiple mud inlets 55 and multiple rectangular openings 56 are provided on the outer end surface of the rotating disc 51. The center knife 53 is arranged at the center of the rotating disc 51, and the multiple groups of cutting knives 54 and the multiple rectangular openings 56 are distributed along the central circumference of the rotating disc 51. The multiple mud inlets 55 are irregularly distributed on the rotating disc 51, so that the soil cut by the cutter disc enters the mud and water bin 42. The water inlet pipe of the mud and water bin 42 can be arranged on the inner end surface of the rotating disc 51 through a branch pipe. Water can flush the soil remaining on the auxiliary disc 6 into the mud and water bin 42 and mix with the mixed mud in the mud and water bin 42. The rectangular opening 56 is used for the cutters on the subsidiary disk 6 to extend to form a single reinforced cutter disk or a composite cutter disk. The diameter of the subsidiary disk 6 is smaller than the diameter of the rotating disk 51, so that there is a gap between the subsidiary disk 6 and the inner wall of the concave cavity, which is convenient for the soil to enter the mud and water bin 42. The subsidiary disk 6 is provided with corresponding telescopic abutment blocks 62 and guide cavities 63 corresponding to the multiple rectangular openings 56. The telescopic abutment blocks 62 are in the shape of four-sided platforms, which are connected to the subsidiary disk 6 through telescopic spring rods. The telescopic abutment blocks 62 can abut on the rectangular openings 56 to retain the soil of the rectangular openings 56 to a certain extent, and prevent large pieces of soil from entering from the rectangular openings 56. The telescopic abutment blocks 62 are provided with profiling knives, which form a single reinforced cutter disk with the cutting knives 54 and the center knives 53 on the rotating disk 51, which are suitable for soft soil bottom layers or soft rock formations. Under suitable soil conditions, the cutter group 64 is not used to protect it; when excavating into hard rock or composite strata, the cutter group 64 is switched to form a composite cutter disc with the cutter 54 and the center cutter 53 on the rotating disc 51, in which the cutter group 64 is the main one and the cutter on the rotating disc 51 is the auxiliary one to assist in cutting.

[0038] like Figure 5 , Figure 6As shown, a special-shaped groove 61 is provided in the center of the auxiliary disk 6, and the end surface of the special-shaped groove 61 is connected to the rotating member 7 through the reinforcing rib 33. The end of the rotating member 7 is rotatably connected to the rotating disk 51 to realize the switching of the tools on the auxiliary disk 6. The roller cutter group 64 is equipped with a moving member 8, and the moving member 8 is used to push the roller cutter group 64 to extend to the rectangular opening 56 to realize the pre-excavation of the roller cutter group 64. The moving member 8 is arranged in the rotating member 7, and the ends of the moving member 8 and the rotating member 7 both transversely penetrate the mud and water bin 42 and are arranged in the working bin 43 and are independently equipped with a driving member. The rotating member 7 includes a first sleeve 71, which is arranged at the end of the working chamber 43 and is provided with a driven gear 72. The driven gear 72 is meshed with a driving gear 73. The rotation of the driving gear 73 drives the driven gear 72 to rotate, thereby realizing the switching of the tools on the auxiliary disk 6. The first sleeve 71 is symmetrically provided with rectangular through grooves 74, and the rectangular through grooves 74 are used to guide the sliding of the moving member 8. The moving member 8 includes a second sleeve 81 slidably connected to the first sleeve 71, and the second sleeve 81 is provided with a sliding block 82 corresponding to the rectangular through groove 74. The sliding block 82 is connected to the moving sleeve 83. The outer end surface of the moving sleeve 83 is provided with a pushing connecting rod 84 corresponding to the hob group 64. The working chamber 43 is provided with a driving member corresponding to the connecting rod of the second sleeve 81. The driving member is a hydraulic telescopic rod. The moving sleeve 83 is pushed by the hydraulic telescopic rod to move the pushing connecting rod 84, thereby extending the hob group 64.

[0039] like Figure 4 As shown, in order to ensure that the auxiliary cutter disc adjusts the required cutter and rotates synchronously with the rotating disc 51 to achieve excavation, a locking member 9 is provided between the second sleeve 81 and the main driving rod 52. The locking member 9 is used to link the second sleeve 81 and the main driving rod 52 to rotate synchronously. The locking member 9 includes a sliding base 94 provided on the main driving rod 52. The sliding base 94 is connected to the second sleeve 81. The sliding base 94 is provided with a telescopic clamping portion 92 controlled by the electromagnet 91 to slide. The telescopic clamping portion 92 includes an engaged section and a non-engaged section. The second sleeve 81 The inner end surface is provided with an internal tooth pattern 93. When the electromagnet 91 is not energized, the meshing section meshes with the internal tooth pattern 93. When the main driving rod 52 rotates, it drives the second sleeve 81 to rotate and then drives the auxiliary disk 6 and the rotating disk 51 to rotate synchronously. When the tool needs to be switched, the electromagnet 91 is energized to retract the telescopic clamping portion 92, so that the meshing section is disengaged from the internal tooth pattern 93, and then the rotating member 7 is started to rotate the auxiliary disk 6 to realize tool switching. The rotation angle between the telescopic abutment block 62 and the hob group 64 is set to 36°, and a rotation of 36° is required to switch the tool once.

[0040] The present application also provides a construction method, comprising the following steps:

[0041] S1: Construction of mud balance system;

[0042] S2: Construction of the launching well;

[0043] S3: Construction of receiving well;

[0044] S4: Auxiliary positioning components, back wall installation and jacking components are installed in the launch shaft;

[0045] S4: Jacking of tool pipe and pipeline components to be jacked

[0046] The tool pipe is pushed forward along the auxiliary positioning component by using the jacking component. The attached cutterhead component of the tool pipe determines the soil conditions of the road section and the distance nodes of different soils before construction, and then rotates and moves accordingly to form a single cutterhead or a composite cutterhead with the first cutterhead component to enter the soil layer, excavate the soil, and mix it with the mud in the mud and water bin and discharge it through the slurry discharge system; after the tunnel boring machine completely enters the soil layer, the cable and mud pipe are removed, and the first section of the pipeline to be jacked is hoisted down and pushed to the tail sleeve of the tunnel boring machine. After the connecting pipe of the tunnel boring head is jacked, the excavation is terminated and the hydraulic pressure is slowly retracted. Another section of the pipeline to be jacked is hoisted into the well again, and it is sleeved behind the first section of the pipeline to be jacked. They are connected together and jacked again. The process is repeated until all the pipelines to be jacked are pushed into the soil layer and a permanent underground pipeline is completed;

[0047] S5: grouting;

[0048] Grouting starts from the first hole of each section of the pipeline to be pushed in, and continues until the slurry comes out of the next hole. After grouting each section, the second grouting is carried out after standing for 6 to 8 hours. The second grouting pressure remains unchanged until the grouting cannot be pushed in any further. In the section with smaller gap at the top of the pipe, grouting inside the pipe is used. In the section with larger gap at the top of the pipe, a combination of grouting inside the pipe and ground grouting is used to improve the grouting effect.

[0049] S6: Tool pipe enters receiving well

[0050] After the tool pipe enters the receiving well as a whole, the machine head and the pipeline to be pushed in are immediately separated to complete the construction.

[0051] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A mud-water balanced pipe jacking construction device, comprising a jacking assembly (1), a pipe (21) assembly (2) to be jacked, and a mud-water balance system, wherein the jacking assembly (1) is installed in a starting well, and the pipe (21) assembly (2) to be jacked comprises a plurality of pipes (21) to be jacked which are closely connected end to end in sequence, and characterized in that: The invention also comprises an auxiliary positioning component (3) and a tool pipe (4). The auxiliary positioning component (3) is installed in the starting well and is used for the jacking component (1) to assist the tool pipe (4) and the pipeline (21) to be jacked in moving along the jacking path. The tool pipe (4) comprises a shell (41). A mud and water tank (42) and a working tank (43) are arranged in the shell (41). The mud and water tank (42) is connected to a mud and water balance system to stabilize the pressure at the front end of the tool pipe (4). A cutterhead component (5) is arranged at the front end of the mud and water tank (42). The cutterhead component (5) can switch between a single reinforced cutterhead or a composite cutterhead according to the soil conditions of the construction section to be jacked.

2. The mud-water balanced pipe jacking construction device according to claim 1 is characterized in that: The cutter disc assembly (5) comprises a rotating disc (51), the inner end surface of the rotating disc (51) is provided with a concave cavity and the center is connected with a main driving rod (52), the end of the main driving rod (52) transversely penetrates the mud and water bin (42) and is arranged in the working bin (43) and is equipped with a driving motor, the outer end surface of the rotating disc (51) is provided with a central knife (53), multiple groups of cutting knives (54), multiple mud inlets (55) and multiple rectangular openings (56), the central knife (53) is arranged at the center of the rotating disc (51), the multiple groups of cutting knives (54) and the multiple rectangular openings (56) are distributed along the central circumference of the rotating disc (51), the multiple mud inlets (55) are irregularly distributed on the rotating disc (51), and the rectangular openings (56) are used for the knives on the auxiliary disc (6) to extend to form a single reinforced cutter disc or a composite cutter disc.

3. The mud-water balanced pipe jacking construction device according to claim 2 is characterized in that: The center of the auxiliary disk (6) is provided with a special-shaped groove (61), the end surface of the special-shaped groove (61) is connected to the rotating member (7) through a reinforcing rib (33), the end of the rotating member (7) is rotatably connected to the rotating disk (51), the rotating member (7) is used to drive the auxiliary disk (6) to rotate to achieve the switching of the tool, the auxiliary disk (6) is provided with corresponding telescopic abutment blocks (62) and guide cavities (63) corresponding to the plurality of rectangular openings (56), the guide cavity (63) is provided with a slidingly connected roller cutter group (64), the roller cutter group (64) is connected to the moving member (8) and the moving member (8) is used to drive the roller cutter group (64) to extend to the rectangular opening (56), the moving member (8) is arranged in the rotating member (7), the ends of the moving member (8) and the rotating member (7) both transversely penetrate the mud and water bin (42) and are arranged in the working bin (43) and are independently provided with a driving member.

4. The mud-water balanced pipe jacking construction device according to claim 3 is characterized in that: The rotating member (7) comprises a first sleeve (71), the first sleeve (71) being arranged at the end of the working chamber (43) and being provided with a driven gear (72), the driven gear (72) being meshed with a driving gear (73), the rotation of the driving gear (73) driving the driven gear (72) to rotate, thereby driving the auxiliary disk (6) to rotate to realize the switching of the telescopic abutment block (62) and the hob group (64), the first sleeve (71) being symmetrically provided with rectangular through grooves (74), the rectangular through grooves (74) being used for guiding the sliding movement of the moving member (8).

5. The mud-water balanced pipe jacking construction device according to claim 4 is characterized in that: The moving member (8) comprises a second sleeve (81) slidably connected in the first sleeve (71); the second sleeve (81) is provided with a sliding block (82) corresponding to the rectangular through slot (74); the sliding block (82) is connected to a moving sleeve (83); and the outer end surface of the moving sleeve (83) is provided with a pushing connecting rod (84) corresponding to the hob assembly (64).

6. The mud-water balanced pipe jacking construction device according to claim 5 is characterized in that: A locking member (9) is provided between the second sleeve (81) and the main drive rod (52), the locking member (9) being used to link the second sleeve (81) and the main drive rod (52) for synchronous rotation, the locking member (9) comprising a sliding base (94) provided on the main drive rod (52), the sliding base (94) being connected to the second sleeve (81), the sliding base (94) being provided with a telescopic clamping portion (92) for sliding controlled by an electromagnet (91), the telescopic clamping portion (92) comprising an engaged section and a non-engaged section, the inner end surface of the second sleeve (81) being provided with an inner tooth pattern (93), when the electromagnet (91) is not energized, the engaged section is engaged with the inner tooth pattern (93).

7. The mud-water balanced pipe jacking construction device according to claim 6 is characterized in that: The auxiliary positioning assembly (3) comprises a first base (31), the first base (31) is provided with a cavity (32) and the upper end surface is arc-shaped, the arc-shaped end surface is provided with a plurality of through grooves to form a plurality of ribs (33), the bottom of the cavity (32) is provided with a guide groove, a telescopic base (34) is slidably connected in the cavity (32), the telescopic base (34) is provided with a raised rib (33) corresponding to the through groove, and the ribs (33) are provided with pressure sensors (35) and are configured with sound prompts.

8. The mud-water balanced pipe jacking construction device according to claim 7 is characterized in that: Both sides of the first base (31) are provided with slots (10), and the side of the telescopic base (34) is correspondingly provided with an extension block (11), and the extension block (11) is provided with a slide groove, and the slide groove is provided with an anti-rotation member (12), and the anti-rotation member (12) is used to limit the rotation of the shell (41) of the tool tube (4) when the tool tube (4) is initially pushed into the hole.

9. The construction method of the mud-water balanced pipe jacking construction device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: Construction of mud balance system; S2: Construction of the launching well; S3: Construction of receiving well; S4: The auxiliary positioning assembly (3), the back wall installation and the jacking assembly (1) are installed in the launch well; S4: Tool pipe (4) and pipeline to be pushed (21) assembly (2) are pushed The tool pipe (4) is pushed forward by the jacking assembly (1) along the auxiliary positioning assembly (3). The auxiliary cutterhead assembly (5) of the tool pipe (4) determines the soil conditions of the road section and the distance nodes of different soils according to the construction before construction, and then rotates and moves accordingly with the first cutterhead assembly (5) to form a single cutterhead or a composite cutterhead to enter the soil layer, excavate the soil, and enter the mud and water bin (42) to mix with the mud and discharge it through the slurry discharge system; after the tunnel boring machine completely enters the soil layer, the cable and the mud pipe are removed, and the first section of the pipeline to be jacked (21) is hoisted down and pushed to the tail sleeve of the tunnel boring machine. After the tunnel boring machine is connected to the tunnel boring head and jacked, the excavation is terminated and the hydraulic pressure is slowly retracted. Another section of the pipeline to be jacked (21) is hoisted into the well again, sleeved behind the first section of the pipeline to be jacked (21), connected together, and jacked again. The process is repeated until all the pipelines to be jacked (21) are pushed into the soil layer, and a permanent underground pipeline is completed; S5: grouting; S6: Tool pipe (4) enters receiving well After the tool pipe (4) as a whole enters the receiving well, the machine head and the pipeline to be pushed (21) are immediately separated to complete the construction.

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