Pipe jacking equipment and construction method

Abstract

The invention relates to the technical field of underground non-excavation construction, and discloses pipe jacking equipment and a construction method.The pipe jacking equipment comprises an abutting-pressing base, a plurality of oil cylinders which are evenly distributed in a rectangular shape are installed at the front end of the abutting-pressing base, the ends, away from the abutting-pressing base, of the oil cylinders abut against pipelines, and the ends, away from the oil cylinders, of the pipelines abut against soil cabins; a combined tool is installed at the end, away from the pipeline, of the soil bin, a machine head is fixed to the periphery of the soil bin, a guide rail is arranged on the side, away from the soil bin, of the machine head, a centering mechanism is slidably connected to the top of the guide rail, an adjusting mechanism is arranged in the soil bin, and a supporting mechanism is arranged on the side, away from the oil cylinder, of the abutting base. Through mutual cooperation of the air cylinder, the isosceles trapezoid block and the wedge block, automatic centering and accurate positioning of the pipeline are achieved, the problems of errors and time consumption caused by traditional manual centering adjustment are solved, and the construction efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of underground trenchless construction, in particular to a pipe jacking device and a construction method. Background Art

[0002] Pipe jacking is an advanced trenchless construction technology, mainly used to lay underground pipelines without damaging the ground. It is widely used in urban water supply, drainage, gas, communications, electricity and other fields. Its core principle is to use pipe jacking equipment to push the pipeline section by section from the starting well, through the underground strata to the receiving well, forming a continuous tunnel or pipeline. Compared with traditional excavation construction methods, pipe jacking can significantly reduce the impact on ground traffic, buildings and the environment, and is particularly suitable for densely populated urban areas and complex geological conditions; Pipe jacking construction equipment is the core tool for implementing pipe jacking technology, usually including the machine head, cutter head, soil chamber, screw conveyor, hydraulic propulsion system, support device, and guide and control system. During the construction process, the cutter head cuts the stratum to form a tunnel, the soil chamber is used to collect the soil under cutting, the hydraulic propulsion system provides power for the pipe jacking, and the support device is used to stabilize the pipe and equipment to ensure the accuracy and safety of the construction. The close cooperation between all components enables the equipment to adapt to a variety of geological conditions and complete efficient and safe construction tasks; However, most of the existing pipe jacking construction equipment relies on manual or mechanical assistance for pipe centering operations. Due to the complex construction environment, centering errors may occur, resulting in pipe axis deviation or uneven force during the jacking process. This not only increases the difficulty of construction adjustment, but may also cause pipe deformation, reduced construction accuracy, and even affect construction progress. In addition, the more traditional alignment methods are inefficient, especially in long-distance pipe jacking construction. Manual adjustment is time-consuming and labor-intensive, and it is difficult to meet the requirements of modern construction for accuracy and efficiency. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a pipe jacking device and a construction method, which solve the problems of inaccurate pipe centering, low efficiency of manual adjustment and axis deviation during construction in the existing pipe jacking equipment.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a pipe jacking device and construction method, including a pressure seat, a plurality of rectangular and evenly distributed oil cylinders are installed at the front end of the pressure seat, the end of the oil cylinder away from the pressure seat is abutted against a pipeline, the end of the pipeline away from the oil cylinder is abutted against a soil chamber, a combined tool is installed at the end of the soil chamber away from the pipeline, a machine head is fixed on the periphery of the soil chamber, a guide rail is provided on the side of the machine head away from the soil chamber, a centering mechanism is slidably connected to the top of the guide rail, an adjustment mechanism is provided inside the soil chamber, and a support mechanism is provided on the side of the pressure seat away from the oil cylinder; The adjustment mechanism includes an electric push rod, which is installed in the middle of the soil chamber. A connecting rod is fixed to one end of the electric push rod close to the combined tool, a moving ring is fixed to the outer periphery of the connecting rod, and a plurality of connecting blocks 1 evenly distributed in a circle are fixed to the outer side of the moving ring. A rotating rod rotates inside the connecting block 1, and a connecting block 2 rotates at one end of the rotating rod away from the connecting block 1, and a movable component is provided inside the end of the connecting block 2 close to the rotating rod.

[0005] Preferably, the centering mechanism includes a base plate, which is slidably connected to the top of the guide rail, a cylinder is fixed to the side of the base plate close to the pressure seat, an isosceles trapezoidal block is fixed to the end of the cylinder close to the soil compartment, right-angled trapezoidal blocks are slidably connected to the left and right sides of the isosceles trapezoidal block, a sliding block is fixed to the side of the right-angled trapezoidal block close to the soil compartment, a fixing rod is fixed to the side of the right-angled trapezoidal block close to the pipe, a support block is fixed to the end of the fixing rod close to the pipe, a rubber pad is fixed to the side of the support block close to the pipe, a sliding groove is provided on the inside of the base plate close to the soil compartment, and a chimeric component is provided on the left and right sides of the isosceles trapezoidal block.

[0006] Preferably, the support mechanism includes a plurality of support plates, and the plurality of support plates are evenly distributed in a rectangular shape and are installed on a side of the pressure seat away from the pipe, connecting plates are fixed on the upper and lower sides of the support plates, a damping rod is fixed to the middle part of the side of the support plate away from the pressure seat, a pressure back plate is fixed to the side of the damping rod away from the support plate, and a plurality of evenly distributed hydraulic cylinders in a rectangular shape are fixed to the side of the support plate away from the pressure seat.

[0007] Preferably, the combined tool comprises a composite cutter disc, which is fixed on a side of the soil compartment away from the pipeline, and a plurality of scrapers and a plurality of rollers are respectively installed on the side of the composite cutter disc away from the pipeline, and a plurality of tooth cutters evenly distributed in a circle are arranged on the outer periphery of the composite cutter disc.

[0008] Preferably, the movable component includes a connecting shaft, which is rotatably connected to one end of the connecting block 2 close to the rotating rod, a movable block is fixed to the outer periphery of the connecting shaft, a movable groove is opened inside the rotating rod, and the movable block is slidably connected inside the movable groove.

[0009] Preferably, the two interlocking components each include a wedge block, the two wedge blocks are respectively fixed on the left and right sides of the isosceles trapezoidal block, the two right-angled trapezoidal blocks are each provided with a wedge groove inside, and the two wedge blocks are respectively slidably connected inside the two wedge grooves.

[0010] Preferably, the sliding block is slidably connected to the inside of the sliding groove, and the outer periphery of the fixing rod is slidably connected to the inside of the bottom plate.

[0011] Preferably, the second connecting block is fixed on the outer periphery of the composite cutter disc, and the toothed cutter is installed on a side of the second connecting block away from the rotating rod.

[0012] Preferably, the two rubber pads have their sides away from the support block abutted against the outer periphery of a side of the pipe close to the support block.

[0013] The present invention also provides a pipe jacking equipment construction method, comprising the following steps: S1. Install the pressure seat vertically in the working well and check whether the cylinder, electric push rod and other components are operating normally; S2, by driving the isosceles trapezoidal block and the wedge block through the cylinder, the support block is adjusted to clamp the pipe and complete the centering; S3, start multiple oil cylinders to apply thrust to the pipeline, while the support plate and damping rod absorb the impact force to ensure smooth advancement of the pipeline; S4, the tooth cutter angle is adjusted by driving the motor and the electric push rod, so that the composite cutter disc can adapt to different formations and cut efficiently; S5. The cylinder continues to push the pipeline forward until the construction is completed.

[0014] The present invention provides a pipe jacking device and a construction method. It has the following beneficial effects: 1. The present invention realizes automatic centering and precise positioning of the pipeline through the mutual cooperation between the cylinder, the isosceles trapezoidal block and the wedge block. The cylinder drives the isosceles trapezoidal block to move, and at the same time drives the wedge block to slide in the wedge groove, thereby driving the right-angle trapezoidal block to move, so that the support block and the rubber pad are in close contact with the pipeline, thereby keeping the pipeline axis aligned during the jacking process. This design avoids the errors and time-consuming problems caused by traditional manual adjustment and centering, improves construction efficiency, ensures the precise positioning of the pipeline, and reduces the problems of offset and uneven force during the jacking process, effectively improving the overall accuracy and stability of the construction.

[0015] 2. The present invention realizes flexible angle adjustment of the toothed cutter through the linkage cooperation among the electric push rod, connecting rod, moving ring, toothed cutter and other components. The electric push rod drives the connecting rod and the moving ring to make the angle of the toothed cutter adjustable according to different formation conditions, so as to adapt to the construction requirements of soft soil, hard rock or soft and hard alternating formations. Through this structure, the cutter disc not only improves the efficiency during the cutting process, but also maintains the stability of the excavation surface under complex formations, avoiding landslides or jamming problems, and solves the problem of difficult adjustment and low efficiency of traditional cutter discs in construction in complex formations, while ensuring construction continuity and safety.

[0016] 3. The present invention optimizes the distribution of force and absorption of impact force during the jacking process through the coordinated cooperation between the support plate, the damping rod and the hydraulic cylinder. The hydraulic cylinder provides a stable and uniform reaction force for the support plate. The damping rod effectively disperses the thrust while absorbing the impact force, reducing the wear of equipment components caused by severe vibration, extending the service life of the equipment, and significantly improving the safety and stability of the jacking construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A perspective view of the present invention; Figure 2 It is a structural schematic diagram of the soil tank of the present invention; Figure 3 It is a structural schematic diagram of the mobile ring of the present invention; Figure 4 It is a structural schematic diagram of the movable block of the present invention; Figure 5 It is a structural schematic diagram of the support block of the present invention; Figure 6 It is a schematic structural diagram of a right-angle trapezoidal block of the present invention; Figure 7 It is a structural schematic diagram of the wedge block of the present invention; Figure 8 It is a structural schematic diagram of the support plate of the present invention.

[0018] Among them, 1. pressure seat; 2. pipeline; 3. machine head; 4. combined tool; 401. composite cutter disc; 402. scraper; 403. hob; 404. toothed cutter; 5. adjustment mechanism; 501. electric push rod; 502. connecting rod; 503. moving ring; 504. connecting block 1; 505. rotating rod; 506. connecting block 2; 6. movable assembly; 601. connecting shaft; 602. movable block; 603. movable groove; 7. centering mechanism; 701. Base plate; 702, cylinder; 703, isosceles trapezoidal block; 704, right-angled trapezoidal block; 705, slider; 706, slide groove; 707, fixing rod; 708, support block; 709, rubber pad; 8, interlocking assembly; 801, wedge block; 802, wedge groove; 9, support mechanism; 901, support plate; 902, connecting plate; 903, hydraulic cylinder; 904, damping rod; 905, back pressure plate; 10, oil cylinder; 11, guide rail; 12, soil compartment. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Please refer to the attached Figure 1 - Attachment Figure 3 The embodiment of the present invention provides a pipe jacking device and a construction method, including a pressure seat 1, the pressure seat 1 is used to provide a reaction force to ensure the stability of the construction, a plurality of rectangular and evenly distributed oil cylinders 10 are installed at the front end of the pressure seat 1, the end of the oil cylinder 10 away from the pressure seat 1 is abutted with a pipeline 2, the oil cylinder 10 is used to provide power to control the movement of the pipeline 2, the end of the pipeline 2 away from the oil cylinder 10 is abutted with a soil chamber 12, the soil chamber 12 is used to collect and cut soil, and the soil blocks are transported by a screw conveyor, a combined tool 4 is installed at the end of the soil chamber 12 away from the pipeline 2, a machine head 3 is fixed on the periphery of the soil chamber 12, a guide rail 11 is provided on the side of the machine head 3 away from the soil chamber 12, the machine head 3 is used to move along the guide rail 11 to control the movement of the soil chamber 12, a centering mechanism 7 is slidably connected to the top of the guide rail 11, an adjustment mechanism 5 is provided inside the soil chamber 12, and a support mechanism 9 is provided on the side of the pressure seat 1 away from the oil cylinder 10; The adjusting mechanism 5 includes an electric push rod 501, which is installed in the middle of the soil chamber 12. A connecting rod 502 is fixed to one end of the electric push rod 501 close to the combined cutter 4. The electric push rod 501 is used to control the movement of the connecting rod 502. A moving ring 503 is fixed to the outer periphery of the connecting rod 502. A plurality of connecting blocks 504 evenly distributed in a circumference are fixed to the outer side of the moving ring 503. The connecting rod 502 is connected to the moving ring 503, and the moving ring 503 is connected to the connecting block 504. Therefore, when the connecting rod 502 moves, the moving ring 503 will be driven to move together, thereby bringing The movable connecting block 504 moves, and a rotating rod 505 rotates inside the connecting block 1 504. A connecting block 2 506 rotates at one end of the rotating rod 505 away from the connecting block 1 504. The rotating rod 505 is connected inside the connecting block 1 504 and the connecting block 2 506. When the distance between the connecting block 1 504 and the connecting block 2 506 changes, the rotating rod 505 will also move accordingly, and will drive the connecting block 2 506 to move. The connecting block 2 506 is fixed on the outer periphery of the composite cutter disc 401, and a movable component 6 is provided inside the end of the connecting block 2 506 close to the rotating rod 505.

[0021] Please refer to the attached Figure 5 - Attachment Figure 6The centering mechanism 7 includes a bottom plate 701, which is slidably connected to the top of the guide rail 11. The bottom plate 701 slides on the guide rail 11 and is used to control the pipeline 2 to move with the soil chamber 12. A cylinder 702 is fixed to one side of the bottom plate 701 close to the pressing seat 1. An isosceles trapezoidal block 703 is fixed to one end of the cylinder 702 close to the soil chamber 12. The cylinder 702 is used to control the movement of the isosceles trapezoidal block 703. The left and right sides of the isosceles trapezoidal block 703 are slidably connected to right-angled trapezoidal blocks 704. The hypotenuse of the right-angled trapezoidal block 704 abuts against the hypotenuse of the isosceles trapezoidal block 703, so that when the isosceles trapezoidal block 703 moves, the right-angled trapezoidal block 704 will be controlled to move accordingly. A slider 705 is fixed to the side of the right-angled trapezoidal block 704 close to the soil chamber 12, and a fixing rod 707 is fixed to the side of the right-angled trapezoidal block 704 close to the pipeline 2. The right-angled trapezoidal block 704 is connected to the fixing rod 707, and when the right-angled trapezoidal block 704 moves, the fixing rod 707 will be driven to move together. A support block 708 is fixed to one end of 707 close to the pipe 2. The fixing rod 707 connects the support block 708 and the right-angled trapezoidal block 704, so that the right-angled trapezoidal block 704 can control the movement of the support block 708. A rubber pad 709 is fixed to the side of the support block 708 close to the pipe 2. The side of the two rubber pads 709 away from the support block 708 abuts against the outer periphery of the side of the pipe 2 close to the support block 708. The rubber pad 709 is used to increase the friction between the pipe 2 and the support block 708. In order to prevent the pipe 2 from sliding off the top of the support block 708, a slide groove 706 is opened on the side of the bottom plate 701 close to the soil chamber 12, and the slider 705 is slidably connected to the inside of the slide groove 706. The slider 705 slides in the slide groove 706 to further limit the movement range of the right-angled trapezoidal block 704, so that the right-angled trapezoidal block 704 can only move horizontally. The outer periphery of the fixing rod 707 is slidably connected to the inside of the bottom plate 701, and the left and right sides of the isosceles trapezoidal block 703 are provided with a mosaic component 8.

[0022] Please refer to the attached Figure 8 The support mechanism 9 includes a plurality of support plates 901, which are evenly distributed in a rectangular shape and are installed on the side of the pressure seat 1 away from the pipeline 2. The support plates 901 are used to evenly distribute the thrust, thereby reducing the deformation or offset of the pipeline caused by excessive force on a single point during construction, thereby improving the construction efficiency. Connecting plates 902 are fixed on the upper and lower sides of the support plate 901, and the connecting plates 902 are used to connect the plurality of support plates 901, thereby improving the correlation between the support plates 901. A damping rod 904 is fixed to the middle part of the side of the support plate 901 away from the pressure seat 1, and a pressure back plate 905 is fixed to the side of the damping rod 904 away from the support plate 901. The damping rod 904 is used to effectively reduce the impact force to avoid equipment failure caused by excessive impact force. A plurality of hydraulic cylinders 903 evenly distributed in a rectangular shape are fixed to the side of the support plate 901 away from the pressure seat 1, and the hydraulic cylinders 903 are used to provide corresponding reaction force.

[0023] Please refer to the attached Figure 2 The combined tool 4 includes a composite cutter disc 401, which is fixed on the side of the soil compartment 12 away from the pipeline 2. A plurality of scrapers 402 and a plurality of rollers 403 are respectively installed on the side of the composite cutter disc 401 away from the pipeline 2. A plurality of tooth cutters 404 are evenly distributed in a circle on the outer periphery of the composite cutter disc 401. The tooth cutters 404 are installed on the side of the connecting block 2 506 away from the rotating rod 505. The composite cutter disc 401 is used to install various cutters and is directly driven to rotate by a motor. It is a well-known prior art. The scrapers 402, rollers 403, and tooth cutters 404 are all used to excavate soil layers. By combining a variety of cutters, the excavation work is more efficient.

[0024] Please refer to the attached Figure 4 The movable component 6 includes a connecting shaft 601, which is rotatably connected to one end of the connecting block 2 506 close to the rotating rod 505. A movable block 602 is fixed to the outer periphery of the connecting shaft 601. A movable groove 603 is provided inside the rotating rod 505. The movable block 602 is slidably connected to the inside of the movable groove 603. The movable groove 603 is used to accommodate the movement of the movable block 602. Both the movable block 602 and the movable groove 603 are rectangular. When the rotating rod 505 rotates, the movable block 602 will slide in the movable groove 603, thereby causing the connecting block 2 506 to rotate, thereby achieving the purpose of adjusting the angle of the tooth cutter 404 to adapt to different types of formations.

[0025] Please refer to the attached Figure 7 The two interlocking components 8 each include a wedge block 801, which are respectively fixed on the left and right sides of the isosceles trapezoidal block 703. The two right-angled trapezoidal blocks 704 are each provided with a wedge groove 802. The two wedge blocks 801 are respectively slidably connected to the inside of the two wedge grooves 802. The wedge blocks 801 and the wedge grooves 802 are also isosceles trapezoids. When the isosceles trapezoidal block 703 moves, the wedge blocks 801 will move accordingly in the wedge grooves 802, thereby applying a pulling force or a pushing force to the right-angled trapezoidal block 704, causing the right-angled trapezoidal block 704 to move.

[0026] The present invention also provides a pipe jacking equipment construction method, comprising the following steps: S1. Install the pressure seat 1 vertically in the working well and check whether the cylinder 702, electric push rod 501 and other components are operating normally; S2, the cylinder 702 drives the isosceles trapezoidal block 703 and the wedge block 801 to cooperate, and the support block 708 is adjusted to clamp the pipe 2 and complete the centering; S3, start multiple oil cylinders 10 to apply thrust to the pipeline 2, while the support plate 901 and the damping rod 904 absorb the impact force to ensure smooth advancement of the pipeline; S4, adjusting the angle of the toothed cutter 404 by driving the motor and the electric push rod 501, so that the composite cutter disc 401 can adapt to different formations and cut efficiently; S5. The oil cylinder 10 continues to push the pipeline 2 forward until the construction is completed.

[0027] Working principle: before the construction begins, the pressure seat 1 is first installed vertically in the working well, and then the cylinder 702 is started. The cylinder 702 controls the isosceles trapezoidal block 703 to move forward. When the isosceles trapezoidal block 703 moves, the two wedge blocks 801 slide in the wedge groove 802 inside the right-angled trapezoidal block 704, thereby controlling the two right-angled trapezoidal blocks 704 to move in opposite directions. After the two right-angled trapezoidal blocks 704 move in opposite directions, the pipe 2 is placed on the top of the two support blocks 708 to contact the rubber pad 709, and then the cylinder 702 is started again to move the isosceles trapezoidal block 703 backward, so that the two support blocks 708 move toward the pipe 2, so that the pipe 2 remains centered; Then, the multiple oil cylinders 10 at the front end of the pressing seat 1 are started, and the oil cylinders 10 extend away from one end of the pressing seat 1, exerting thrust on the pipe 2, pushing the pipe 2 forward. During the process of pushing the pipe 2 forward, the damping rods 904 in the middle of the multiple support plates 901 and the multiple hydraulic cylinders 903 provide reaction force, and the damping rods 904 can absorb and disperse the impact force, so that the pushing process is more stable. After the composite cutter disc 401 contacts the soil layer, the composite cutter disc 401 is started to rotate through the built-in drive motor, and the electric push rod 501 is started. The electric push rod 501 controls the connecting rod 502 to move forward. At this time, the moving ring 503 moves forward. When the moving ring 503 moves forward, the connecting block 1 504 controls the rotating rod 505 to rotate. When the rotating rod 505 rotates, it will drive the connecting block 2 506 to rotate accordingly. When the connecting block 2 506 rotates, it will adjust the angle of the tooth knife 404 accordingly, so as to better cope with soil layers in different situations and improve construction efficiency.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pipe jacking device, comprising a pressing seat (1), characterized in that: A plurality of rectangular and evenly distributed oil cylinders (10) are installed at the front end of the pressure seat (1); one end of the oil cylinder (10) away from the pressure seat (1) is in contact with a pipe (2); one end of the pipe (2) away from the oil cylinder (10) is in contact with a soil chamber (12); one end of the soil chamber (12) away from the pipe (2) is installed with a combined tool (4); a machine head (3) is fixed to the periphery of the soil chamber (12); a guide rail (11) is provided on the side of the machine head (3) away from the soil chamber (12); a centering mechanism (7) is slidably connected to the top of the guide rail (11); an adjusting mechanism (5) is provided inside the soil chamber (12); and a supporting mechanism (9) is provided on the side of the pressure seat (1) away from the oil cylinder (10); The adjustment mechanism (5) comprises an electric push rod (501), wherein the electric push rod (501) is installed in the middle of the soil chamber (12), a connecting rod (502) is fixed to one end of the electric push rod (501) close to the combined cutter (4), a moving ring (503) is fixed to the outer periphery of the connecting rod (502), a plurality of connecting blocks (504) evenly distributed in a circumference are fixed to the outer side of the moving ring (503), a rotating rod (505) is rotatably provided inside the connecting block (504), a connecting block (506) is rotatably provided at one end of the rotating rod (505) away from the connecting block (504), and a movable component (6) is provided inside the end of the connecting block (506) close to the rotating rod (505).

2. A pipe jacking device according to claim 1, characterized in that: The centering mechanism (7) comprises a bottom plate (701), the bottom plate (701) being slidably connected to the top of the guide rail (11), a cylinder (702) being fixed to a side of the bottom plate (701) close to the pressure seat (1), an isosceles trapezoidal block (703) being fixed to an end of the cylinder (702) close to the soil chamber (12), right-angled trapezoidal blocks (704) being slidably connected to the left and right sides of the isosceles trapezoidal block (703), and the right-angled trapezoidal block (704) being fixed to a side close to the soil chamber (12). A slider (705) is provided, a fixing rod (707) is fixed to a side of the right-angled trapezoidal block (704) close to the pipe (2), a support block (708) is fixed to one end of the fixing rod (707) close to the pipe (2), a rubber pad (709) is fixed to a side of the support block (708) close to the pipe (2), a sliding groove (706) is provided inside the bottom plate (701) close to the soil compartment (12), and a chimeric component (8) is provided on both the left and right sides of the isosceles trapezoidal block (703).

3. A pipe jacking device according to claim 1, characterized in that: The support mechanism (9) comprises a plurality of support plates (901), the plurality of support plates (901) being evenly distributed in a rectangular shape and installed on a side of the pressure seat (1) away from the pipe (2), a connecting plate (902) being fixed to both the upper and lower sides of the support plate (901), a damping rod (904) being fixed to the middle of a side of the support plate (901) away from the pressure seat (1), a pressure back plate (905) being fixed to a side of the damping rod (904) away from the support plate (901), and a plurality of evenly distributed hydraulic cylinders (903) being fixed to a side of the support plate (901) away from the pressure seat (1).

4. A pipe jacking device according to claim 1, characterized in that: The combined cutter (4) comprises a composite cutter disc (401), the composite cutter disc (401) being fixed on a side of the soil chamber (12) away from the pipeline (2), a plurality of scrapers (402) and a plurality of rollers (403) being respectively installed on the side of the composite cutter disc (401) away from the pipeline (2), and a plurality of tooth cutters (404) evenly distributed in a circumference are provided on the outer periphery of the composite cutter disc (401).

5. A pipe jacking device according to claim 1, characterized in that: The movable assembly (6) comprises a connecting shaft (601), wherein the connecting shaft (601) is rotatably connected to one end of the second connecting block (506) close to the rotating rod (505), a movable block (602) is fixed to the outer periphery of the connecting shaft (601), a movable groove (603) is provided inside the rotating rod (505), and the movable block (602) is slidably connected inside the movable groove (603).

6. A pipe jacking device according to claim 2, characterized in that: The two interlocking components (8) each comprise a wedge block (801), the two wedge blocks (801) being fixed to the left and right sides of the isosceles trapezoidal block (703) respectively, the two right-angled trapezoidal blocks (704) each have a wedge groove (802) formed inside, and the two wedge blocks (801) are slidably connected inside the two wedge grooves (802) respectively.

7. A pipe jacking device according to claim 2, characterized in that: The sliding block (705) is slidably connected to the inside of the sliding groove (706), and the outer periphery of the fixing rod (707) is slidably connected to the inside of the bottom plate (701).

8. A pipe jacking device according to claim 4, characterized in that: The second connecting block (506) is fixed to the outer periphery of the composite cutter disc (401), and the toothed cutter (404) is installed on a side of the second connecting block (506) away from the rotating rod (505).

9. A pipe jacking device according to claim 2, characterized in that: The two rubber pads (709) are in contact with the outer periphery of a side of the pipe (2) close to the support block (708) on the side away from the support block (708).

10. A method for constructing a pipe jacking device, according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Install the pressure seat (1) vertically in the working well and check whether the cylinder (702), electric push rod (501) and other components are operating normally; S2, driving the isosceles trapezoidal block (703) and the wedge block (801) to cooperate with each other through the cylinder (702), adjusting the support block (708) to clamp the pipe (2) and complete the centering; S3, starting the multiple oil cylinders (10) to apply thrust to the pipeline (2), while the support plate (901) and the damping rod (904) absorb the impact force to ensure smooth advancement of the pipeline; S4, adjusting the angle of the toothed cutter (404) by driving the motor and the electric push rod (501) in a coordinated manner, so that the composite cutter disc (401) can adapt to different formations and cut efficiently; S5. The oil cylinder (10) continues to push the pipeline (2) forward until the construction is completed.

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