Adjustable pipe jacking stop bracket and stop method thereof

Abstract

The present invention provides an adjustable pipe jacking stop bracket and a stop method thereof, comprising a stop bracket, two of which are symmetrically installed on both sides of the pipe section jacking direction, a vertical adjustment mechanism, a horizontal adjustment mechanism, a propulsion mechanism and a fixing pin are provided on the stop bracket, and the fixing pin is installed on the propulsion mechanism, and the propulsion mechanism adjusts the position through the vertical adjustment mechanism and the horizontal adjustment mechanism, and inserts the fixing pin into the hoisting hole on the pipe section to limit the position of the pipe section and prevent the pipe section from retreating. When the pipe section needs to be moved, the fixing pin is pulled out to continue moving forward.

Description

Technical Field

[0001] The invention belongs to the technical field of geotechnical engineering pipe jacking, and particularly relates to an adjustable pipe jacking stop bracket and a stop method thereof. Background Art

[0002] Pipe jacking technology is a trenchless technology. Its principle is that under the action of the jacking cylinder, the pipe jacking machine can continuously cut the soil layer in front and discharge the soil through a special excavation device. The pipe section at the rear is continuously pushed forward until it is penetrated. During the construction process, the lifting and assembly of the pipe section is an indispensable and important link. When lifting and assembling the pipe section, the jacking iron and the jacking cylinder will be separated from the pipe section. At this time, because the friction between the pipe section and the soil is less than the resistance of the soil to the pipe jacking machine, the pipe section as a whole will retreat. This phenomenon is more likely to occur in deep buried strata. At this time, in order to limit the retreat of the pipe section, prevent the jacking posture from getting out of control and the excavation area from collapsing, a retreat stop device needs to be set to prevent the pipe section from retreating.

[0003] Pipe sections are generally connected by welding or socket joints. Therefore, there is a process of jacking-stopping-hoisting and splicing during the construction process. Therefore, the pipe section anti-retraction device is extremely important for construction. For long-distance jacking construction, the role of the anti-retraction device is particularly obvious. At present, there are mainly the following methods for preventing the retreat of pipe sections: 1. An embedded steel plate is set on the pipe section. When the jacking is stopped, the embedded steel plate is welded to the guide rail of the pipe section to prevent the pipe section from retreating. After the subsequent pipe section assembly is completed, it is cut off. Although this method can effectively limit the movement of the pipe section, it is time-consuming and labor-intensive, which is not conducive to the construction. 2. Use a support rod to act between the pipe section and the guide rail to prevent the pipe section from retreating. The disadvantage is that the stability cannot be guaranteed and it is easy to slide. Summary of the invention

[0004] In view of the above problems, the invention aims to provide an adjustable jacking pipe stop bracket and a stop method thereof to overcome the shortcomings of the existing equipment. The fixing pin of the equipment can be moved within a certain range to adapt to different jacking pipe hoisting hole positions. It has the advantages of simple and flexible operation.

[0005] The technical solution adopted by the present invention is:

[0006] An adjustable pipe jacking stop bracket includes a stop bracket, two of which are symmetrically installed on both sides of the pipe section's jacking direction, a vertical adjustment mechanism, a horizontal adjustment mechanism, a propulsion mechanism and a fixing pin are provided on the stop bracket, and the fixing pin is installed on the propulsion mechanism. The propulsion mechanism adjusts its position through the vertical adjustment mechanism and the horizontal adjustment mechanism, and inserts the fixing pin into a lifting hole on the pipe section to achieve position limiting of the pipe section.

[0007] Preferably, the anti-retreat bracket includes a front bracket, an auxiliary bracket, a rear bracket, a lateral bracket, a vertical bracket and a connecting bracket. Two vertical brackets are provided and fixed by a connecting bracket. The front bracket and the rear bracket are fixedly connected to the back sides of the two vertical brackets respectively. One end of the auxiliary bracket is fixedly connected to the side wall of the front bracket, and the other end is welded to the baffle. The baffle is connected to the inner wall of the starting shaft by bolts. One end of the lateral bracket is connected to the vertical bracket, and the other end is connected to the inner wall of the starting shaft.

[0008] Preferably, the vertical adjustment mechanism includes a vertical rod, two of the vertical rods are provided and fixed at both ends of the connecting bracket, an adjustment seat is sleeved on each vertical rod, a side wall of the vertical rod close to the pipe joint is provided with a plurality of first tooth grooves along its vertical direction, a first through hole is provided on the adjustment seat along the vertical direction, and a mounting groove is provided on the adjustment seat along the horizontal direction, the first through hole is connected with the mounting groove, an adjustment block is provided in the mounting groove, one side wall of the adjustment block is located on the outside of the adjustment seat, a second through hole is provided on the adjustment block along the vertical direction, the vertical rod passes through the second through hole, and teeth matching the first tooth grooves are provided on the inner wall of the second through hole, and a first compression spring is provided between the other side wall of the adjustment block and the inner wall of the mounting groove.

[0009] Preferably, two symmetrical inner side walls on the mounting groove are provided with horizontal rods, and the adjusting block is provided with guide holes penetrating the horizontal rods.

[0010] Preferably, the horizontal adjustment mechanism includes a first motor, a screw rod and a slider, a horizontal plate is provided on the side wall of the vertical rod, the first motor is mounted on the horizontal plate, one end of the screw rod is connected to the motor, and the other end is movably connected to the side wall of the other vertical rod, and the slider is sleeved on the screw rod.

[0011] Preferably, the propulsion mechanism includes a slide rail and a moving seat, the slide rail is arranged on the slider, the moving seat is sleeved on the slide rail, the upper end face of the slide rail is provided with a second tooth groove along its axial direction, the upper end face of the moving seat is provided with a second motor, the output shaft of the second motor is installed with a gear, the upper end face of the moving seat is provided with a first notch along its axial direction, the bottom of the gear passes through the first notch and engages with the second tooth groove, and a mounting plate is also provided on the moving seat, and the fixing pin is fixed on the mounting plate.

[0012] Preferably, a plurality of limit grooves are arranged on the two symmetrical inner walls of the movable seat along the length direction thereof, balls are arranged in the limit grooves, 1 / 3 of the volume of the balls are exposed outside the limit grooves, and a W-shaped rail groove is arranged on the side wall of the slide rail along the length direction thereof, and the balls are in rolling contact with the raised parts of the W-shaped rail groove.

[0013] Preferably, the interior of the fixing pin is a hollow structure, an opening is provided at one end of the fixing pin, a T-shaped seat is provided at the opening, a through hole is provided on the central axis of the T-shaped seat, a push rod is provided in the through hole, a push plate is provided at one end of the push rod, the other end of the push rod is located in the hollow structure and mutually symmetrical protrusions are provided on the outer wall thereof, a limiting block is provided on the protrusion, a limiting plate is provided on the outer side wall at the bottom of the limiting block, the limiting block and the protrusion are connected by a second compression spring, a second notch matching the limiting block is provided on the cylinder wall of the fixing pin, an elastic steel sheet is provided in the second notch, the center of the elastic steel sheet is recessed inward to form a curved portion, and the curved portion is located in the hollow structure.

[0014] Preferably, a convex strip is provided on the inner wall of the perforation of the T-shaped seat, a groove matching with the convex strip is provided on the side wall of the push rod, and a limiting cylinder is provided on the inner end surface of the hollow structure, and the limiting cylinder and the push rod are located on the same axis.

[0015] A method for preventing a pipe from retreating of an adjustable pipe-jacking prevention bracket comprises the following steps:

[0016] Step 1: First, assemble the front bracket, auxiliary bracket, rear bracket, lateral bracket, vertical bracket and connecting bracket according to the length of the pipe section and the position of the lifting hole to form a stop bracket;

[0017] Step 2: Install the vertical adjustment mechanism and the horizontal adjustment mechanism;

[0018] Step 3: Manually press the adjustment block, the adjustment block moves into the installation groove, the first tooth groove is disengaged from the tooth, and the adjustment seat is moved up and down along the vertical rod, so that the fixing pin and the lifting hole are located on the same horizontal axis; then start the first motor, the slider moves horizontally on the screw rod, and the left and right positions of the slider are adjusted so that the fixing pin is aligned with the lifting hole;

[0019] Step 4: Start the second motor, the driving gear meshes with the second tooth groove, drives the moving seat to move along the slide rail, and the fixing pin approaches the lifting hole and is inserted into the lifting hole;

[0020] Step 5: Push the push plate and the push rod to move into the hollow structure. During the movement, the limit block squeezes the elastic steel sheet to bend outward, thereby supporting the inside of the lifting hole, increasing the contact resistance between the fixing pin and the lifting hole, and fixing the pipe joint.

[0021] Beneficial effects of the present invention:

[0022] (1) The structure is more solid. The use of auxiliary brackets further strengthens the connection strength between the front bracket and the opening; the lateral brackets can strengthen the strength of the overall structure in the direction perpendicular to the jacking direction; the auxiliary brackets further strengthen the connection strength between the two vertical brackets.

[0023] (2) A vertical adjustment mechanism and a horizontal adjustment mechanism are designed, wherein the vertical adjustment mechanism is composed of a vertical rod and an adjustment seat, the adjustment seat runs through the vertical rod, and an adjustment block is arranged in the adjustment seat along its horizontal direction. By pressing the adjustment block, the teeth on the adjustment block are disengaged from the first tooth groove on the vertical rod, which is convenient for adjusting the position of the adjustment seat up and down. When fixing, only the adjustment block needs to be loosened. Under the pressure of the first compression spring, the first tooth groove and the teeth are re-engaged. The structure is simple, more convenient and safer to operate, and can greatly improve the efficiency during the construction process. The vertical adjustment mechanism and the horizontal adjustment mechanism make the fixing pin better match the lifting hole on the pipe section.

[0024] (3) A propulsion mechanism is designed, which consists of a slide rail and a moving seat. The slide rail and the moving seat are relative to each other through the meshing of the second motor-driven gear and the second tooth groove. The fixing pin is automatically inserted into the lifting hole by the meshing drive of the gear and the second tooth groove. The operation is more convenient and simple, and the safety is higher. At the same time, in order to reduce the resistance of the relative sliding between the slide rail and the moving seat, limit grooves are set on the two symmetrical inner walls of the moving seat. Balls are installed in the limit grooves, and 1 / 3 of the volume of the balls is exposed outside the limit grooves. A W-shaped track groove is set on the side wall of the slide rail along its length direction. The ball rolls and the raised part of the W-shaped track groove are in rolling contact, thereby improving the surface contact between the slide rail and the moving seat to rolling contact between the ball and the W-shaped track groove, that is, point contact, which greatly reduces the relative friction between the moving seat and the slide rail, thereby making the relative sliding of the moving seat more stable and its service life longer.

[0025] (4) A new design is made for the fixing pin. The fixing pin is designed into a hollow structure. A push rod is designed inside the fixing pin. Mutually symmetrical protrusions are arranged on the outer wall of the push rod. A limit block is arranged on the protrusion. The limit block and the protrusion are connected by a second compression spring. A second notch matching the limit block is arranged on the cylinder wall of the fixing pin. An elastic steel sheet is arranged in the second notch. The center of the elastic steel sheet is concave inward to form a curved portion. The curved portion is located in the hollow structure. The push rod is pushed and the limit block squeezes the curved portion, so that the curved portion bends outward, thereby squeezing the inner wall of the lifting hole, increasing the contact pressure between the fixing pin and the lifting hole, thereby increasing the relative resistance, so that the fixing pin can be stably fixed in the lifting hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic elevation view of the adjustable jacking pipe anti-retraction bracket of the present invention.

[0028] Figure 2 It is a top view schematic diagram of the adjustable jacking pipe back-stop bracket of the present invention.

[0029] Figure 3 for Figure 1 Enlarged view of point A in the middle.

[0030] Figure 4 for Figure 3 Cross-sectional view along the BB direction.

[0031] Figure 5 for Figure 4 Enlarged view of point D in the middle.

[0032] Figure 6 for Figure 2 Enlarged view of point C in the middle.

[0033] Figure 7 A cross-sectional view of the fixing pin.

[0034] Figure 8 This is a diagram showing the fixing pin being inserted into the lifting hole.

[0035] Fig. 9 It is a side sectional view of the vertical adjustment mechanism.

[0036] Among them: 1. anti-retraction bracket; 101. front bracket; 102. auxiliary bracket; 103. rear bracket; 104. lateral bracket; 105. vertical bracket; 106. connecting bracket; 2. vertical adjustment mechanism; 201. vertical rod; 2011. first tooth groove; 202. adjustment seat; 2021. first through hole; 2022. mounting groove; 2023. horizontal rod; 203. adjustment block; 2031. second through hole; 2032. tooth; 2033. guide hole; 204. first compression spring; 3. horizontal adjustment mechanism; 301. first motor; 302. lead screw; 303. slider; 4. slide rail; 401. second tooth groove; 402. W-shaped rail groove; 5. moving seat; 501. first notch; 502. ball bearing; 6. second motor; 7. Mounting plate; 8. Fixing pin; 801. Cylinder wall; 8011. Second notch; 802. T-shaped seat; 803. Raised strip; 804. Push rod; 8041. Groove; 805. Bump; 806. Limit block; 807. Second compression spring; 808. Elastic steel sheet; 809. Limit cylinder; 810. Push plate; 811. Limit plate; 9. Gear; 10. Horizontal plate; 11. Pipe joint; 12. Lifting hole; 13. Push iron; 14. Pushing cylinder; 15. Back wall; 16. Pipe joint guide rail. DETAILED DESCRIPTION

[0037] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0038] Example 1

[0039] The present embodiment provides an adjustable pipe jacking stop bracket 1, including a stop bracket 1, two of which are symmetrically installed on both sides of the jacking direction of the pipe segment 11, and the stop bracket 1 is provided with a vertical adjustment mechanism 2, a horizontal adjustment mechanism 3, a propulsion mechanism and a fixing pin 8, and the fixing pin 8 is installed on the propulsion mechanism. The propulsion mechanism adjusts its position through the vertical adjustment mechanism 2 and the horizontal adjustment mechanism 3, and inserts the fixing pin 8 into the lifting hole 12 on the pipe segment 11 to achieve the limitation of the pipe segment 11.

[0040] Specifically, Figure 1 , Figure 2 As shown, the anti-retraction bracket 1 includes a front bracket 101, an auxiliary bracket 102, a rear bracket 103, a lateral bracket 104, a vertical bracket 105 and a connecting bracket 106. The vertical bracket 105 is provided with two and fixed by the connecting bracket 106. The front bracket 101 and the rear bracket 103 are respectively fixedly connected to the backs of the two vertical brackets 105. One end of the auxiliary bracket 102 is fixedly connected to the side wall of the front bracket 101, and the other end thereof is welded to the baffle 107. The baffle 107 is connected to the inner wall of the starting shaft by bolts. One end of the lateral bracket 104 is connected to the vertical bracket 105, and the other end thereof is connected to the inner wall of the starting shaft. The use of the auxiliary bracket 102 further strengthens the connection strength between the front bracket 101 and the opening; the lateral bracket 104 can strengthen the strength of the overall structure in a direction perpendicular to the jacking direction; the auxiliary bracket 102 further strengthens the connection strength between the two vertical brackets 105.

[0041] In this embodiment, the vertical adjustment mechanism 2 is as follows: Fig. 9As shown, it includes a vertical rod 201, two of which are provided and fixed at both ends of the connecting bracket 106, and each vertical rod 201 is sleeved with an adjustment seat 202, and a side wall of the vertical rod 201 close to the pipe section 11 is provided with a plurality of first tooth grooves 2011 along its vertical direction, and a first through hole 2021 penetrating the vertical rod 201 is provided on the adjustment seat 202 in the vertical direction, and a mounting groove 2022 is provided on the adjustment seat 202 in the horizontal direction, and the first through hole 2021 is connected with the mounting groove 2022, and an adjustment block 203 is provided in the mounting groove 2022, and a side wall of the adjustment block 203 is located at the adjustment seat 202. On the outside, the adjustment block 203 is provided with a second through hole 2031 in the vertical direction, and the vertical rod 201 passes through the second through hole 2031. The inner wall of the second through hole 2031 is provided with teeth 2032 that match the first tooth groove 2011. A first compression spring 204 is provided between the other side wall of the adjustment block 203 and the inner wall of the installation groove 2022.

[0042] Press the adjustment block 203, the adjustment block 203 moves toward the inside of the installation groove 2022, the first tooth groove 2011 and the tooth 2032 are separated, and the adjustment seat 202 loses connection with the vertical rod 201, so that the adjustment seat 202 is conveniently moved up and down, so that the height position of the fixing pin 8 is adjusted to be on the same horizontal line with the lifting hole 12, and the adjustment block 203 is released. Under the pressure of the first compression spring 204, the adjustment block 203 is reset, the first tooth groove 2011 and the tooth 2032 are re-engaged, and the adjustment seat 202 and the vertical rod 201 are fixed.

[0043] In order to improve the stability of the adjustment block 203 in the installation groove 2022, horizontal rods 2023 are arranged on the two symmetrical inner walls of the installation groove 2022, and the adjustment block 203 is provided with a guide hole 2033 penetrating the horizontal rod 2023. Then, through the limitation of the horizontal rod 2023 and the guide hole 2033, the movement direction of the adjustment block 203 is determined to prevent the adjustment block 203 from shaking in the installation groove 2022.

[0044] like Figure 6 As shown, the horizontal adjustment mechanism 3 includes a first motor 301, a screw rod 302 and a slider 303. A horizontal plate 10 is arranged on the side wall of the vertical rod 201. The first motor 301 is installed on the horizontal plate 10. One end of the screw rod 302 is connected to the motor, and the other end thereof is movably connected to the side wall of another vertical rod 201. The slider 303 is sleeved on the screw rod 302.

[0045] In this embodiment, the propulsion mechanism is mounted on the slider 303. Figure 3-5As shown, the propulsion mechanism includes a slide rail 4 and a moving seat 5, the slide rail 4 is arranged on the slider 303, the moving seat 5 is sleeved on the slide rail 4, the upper end face of the slide rail 4 is provided with a second tooth groove 401 along its axial direction, the upper end face of the moving seat 5 is provided with a second motor 6, the output shaft of the second motor 6 is installed with a gear 9, the upper end face of the moving seat 5 is provided with a first notch 501 along its axial direction, the bottom of the gear 9 passes through the first notch 501 and meshes with the second tooth groove 401, and a mounting plate 7 is also provided on the moving seat 5, and the fixing pin 8 is fixed on the mounting plate 7.

[0046] The second motor 6 is started, and the driving gear 9 engages with the second tooth groove 401 to drive the moving seat 5 to move relatively along the slide rail 4, so that the fixing pin 8 is inserted into the lifting hole 12. In order to improve the stability and smoothness of the relative sliding of the moving seat 5, a plurality of limiting grooves are arranged on the two symmetrical inner walls of the moving seat 5 along its length direction, and a ball 502 is arranged in the limiting groove, and 1 / 3 of the volume of the ball 502 is exposed outside the limiting groove. A W-shaped rail groove 402 is arranged on the side wall of the slide rail 4 along its length direction, and the ball 502 is in rolling contact with the convex part of the W-shaped rail groove 402. Thus, the surface contact between the moving seat 5 and the slide rail 4 is improved to a point contact between the ball 502 and the W-shaped rail groove 402, thereby reducing the friction resistance between the moving seat 5 and the slide rail 4.

[0047] This embodiment also provides a method for preventing a pipe from retreating by using the adjustable pipe-jacking-preventing-retreat support 1, comprising the following steps:

[0048] Step 1: First, according to the length of the pipe section 11 and the position of the lifting hole 12, assemble the front bracket 101, the auxiliary bracket 102, the rear bracket 103, the lateral bracket 104, the vertical bracket 105 and the connecting bracket 106 to form the anti-retraction bracket 1;

[0049] Step 2: Install the vertical adjustment mechanism 2 and the horizontal adjustment mechanism 3 (the bottom of the vertical rod 201 can be welded or bolted to the connecting bracket 106, and the adjustment seat 202, the horizontal plate 10, the first motor 301, the screw rod 302 and the propulsion mechanism are all assembled in the factory);

[0050] Step 3: Manually press the adjustment block 203, the adjustment block 203 moves into the installation groove 2022, the first tooth groove 2011 is disengaged from the tooth 2032, and the adjustment seat 202 is moved up and down along the vertical rod 201, so that the fixing pin 8 and the hanging hole 12 are located on the same horizontal axis; then start the first motor 301, the slider 303 moves horizontally on the screw rod 302, and the left and right position of the slider 303 is adjusted so that the fixing pin 8 is aligned with the hanging hole 12;

[0051] Step 4: Start the second motor 6 , the driving gear 9 meshes with the second tooth groove 401 , driving the movable seat 5 to move along the slide rail 4 , and the fixing pin 8 approaches the hoisting hole 12 and is inserted into the hoisting hole 12 to fix the pipe section 11 .

[0052] Example 2

[0053] This embodiment further improves the fixing pin 8 on the basis of the embodiment 1, as shown in FIGS. 7 and 8. Figure 8 As shown, the interior of the fixing pin 8 is a hollow structure, one end of the fixing pin 8 is provided with an opening, and a T-shaped seat 802 is provided at the opening. A through hole is provided on the central axis of the T-shaped seat, and a push rod 804 is provided in the through hole. A push plate 810 is provided at one end of the push rod 804, and the other end is located in the hollow structure and has mutually symmetrical protrusions 805 on its outer wall. A limiting block 806 is provided on the protrusion 805, and a limiting plate 811 is provided on the outer wall at the bottom of the limiting block. The bottom of the limiting plate 811 contacts the outer wall of the push rod, and the limiting block 806 is connected to the protrusion 805 by a second compression spring 807. A second notch 8011 matching the limiting block 806 is provided on the barrel wall 801 of the fixing pin 8, and an elastic steel sheet 808 is provided in the second notch 8011. The center of the elastic steel sheet 808 is recessed inward to form a curved portion, and the curved portion is located in the hollow structure.

[0054] By pushing the push plate 810, the push rod 804 moves toward the inside of the hollow structure, and the limit block 806 continuously squeezes the elastic steel sheet 808, causing the originally inwardly concave curved portion to bend outward, thereby squeezing the inner wall of the hanging hole 12, increasing the relative squeezing force between the fixing pin 8 and the inside of the hanging hole 12, thereby increasing the relative friction resistance between the fixing pin 8 and the inner wall of the hanging hole 12, so that the fixing pin 8 can be firmly fixed in the hanging hole 12.

[0055] In order to prevent the push rod 804 from rotating during movement, a convex strip 803 is provided on the inner wall of the perforation of the T-shaped seat 802, a groove 8041 matching the convex strip 803 is provided on the side wall of the push rod 804, and a limiting cylinder 809 is provided on the inner end surface of the hollow structure, and the limiting cylinder 809 and the push rod 804 are located on the same axis. It is ensured that the push rod 804 always moves only horizontally to avoid rotation.

[0056] This embodiment also provides a method for preventing a pipe from retreating by using the adjustable pipe-jacking-preventing-retreat support 1, comprising the following steps:

[0057] Step 1: First, according to the length of the pipe section 11 and the position of the lifting hole 12, assemble the front bracket 101, the auxiliary bracket 102, the rear bracket 103, the lateral bracket 104, the vertical bracket 105 and the connecting bracket 106 to form the anti-retraction bracket 1;

[0058] Step 2: Install the vertical adjustment mechanism 2 and the horizontal adjustment mechanism 3 (the bottom of the vertical rod 201 can be welded or bolted to the connecting bracket 106, and the adjustment seat 202, the horizontal plate 10, the first motor 301, the screw rod 302 and the propulsion mechanism are all assembled in the factory);

[0059] Step 3: Manually press the adjustment block 203, the adjustment block 203 moves into the installation groove 2022, the first tooth groove 2011 is disengaged from the tooth 2032, and the adjustment seat 202 is moved up and down along the vertical rod 201, so that the fixing pin 8 and the hanging hole 12 are located on the same horizontal axis; then start the first motor 301, the slider 303 moves horizontally on the screw rod 302, and the left and right position of the slider 303 is adjusted so that the fixing pin 8 is aligned with the hanging hole 12;

[0060] Step 4: Start the second motor 6, the driving gear 9 meshes with the second tooth groove 401, drives the moving seat 5 to move along the slide rail 4, and the fixing pin 8 approaches the lifting hole 12 and is inserted into the lifting hole 12;

[0061] Step 5: Push the push plate 810 and the push rod 804 moves into the hollow structure. During the movement, the limit block 806 squeezes the elastic steel sheet 808 to bend outward, thereby supporting the inside of the hanging hole 12, increasing the contact resistance between the fixing pin 8 and the hanging hole 12, and fixing the pipe segment 11.

[0062] When it is necessary to push the pipe section 11 forward, first use the pushing cylinder 14 to push the pushing iron 13 to the last pipe section 11, then pull the fixing pin 8 out of the lifting hole 12 of the pipe section 11, and then the pushing cylinder 14 can continue to move forward to continue pushing the pipe section 11 forward.

[0063] The above description is only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. An adjustable pipe jacking stop bracket, characterized in that: It includes a backstop bracket, two of which are symmetrically installed on both sides of the pipe section in the jacking direction, and the backstop bracket is provided with a vertical adjustment mechanism, a horizontal adjustment mechanism, a propulsion mechanism and a fixing pin, and the fixing pin is installed on the propulsion mechanism. The propulsion mechanism adjusts its position through the vertical adjustment mechanism and the horizontal adjustment mechanism, and the fixing pin is inserted into the hoisting hole on the pipe section to achieve the limit of the pipe section; The anti-retraction bracket includes a front bracket, an auxiliary bracket, a rear bracket, a lateral bracket, a vertical bracket and a connecting bracket. The vertical bracket is provided with two and fixed by the connecting bracket. The front bracket and the rear bracket are fixedly connected to the backs of the two vertical brackets respectively. One end of the auxiliary bracket is fixedly connected to the side wall of the front bracket, and the other end thereof is welded to the baffle. The baffle is connected to the inner wall of the starting shaft by bolts. One end of the lateral bracket is connected to the vertical bracket, and the other end thereof is connected to the inner wall of the starting shaft. The vertical adjustment mechanism comprises a vertical rod, the vertical rod is provided with two and fixed at both ends of the connecting bracket, each vertical rod is sleeved with an adjustment seat, a side wall of the vertical rod close to the pipe section is provided with a plurality of first tooth grooves along its vertical direction, a first through hole penetrating the vertical rod is provided on the adjustment seat in the vertical direction, a mounting groove is provided on the adjustment seat in the horizontal direction, the first through hole is connected with the mounting groove, an adjustment block is provided in the mounting groove, one side wall of the adjustment block is located at the outer side of the adjustment seat, a second through hole is provided on the adjustment block in the vertical direction, the vertical rod passes through the second through hole, teeth matching the first tooth groove are provided on the inner wall of the second through hole, and a first compression spring is provided between the other side wall of the adjustment block and the inner wall of the mounting groove; Two symmetrical inner side walls of the installation groove are provided with horizontal rods, and the adjustment block is provided with a guide hole penetrating the horizontal rods; The horizontal adjustment mechanism includes a first motor, a screw rod and a slider. A horizontal plate is provided on the side wall of the vertical rod. The first motor is mounted on the horizontal plate. One end of the screw rod is connected to the motor, and the other end is movably connected to the side wall of the other vertical rod. The slider is sleeved on the screw rod. The propulsion mechanism includes a slide rail and a moving seat, the slide rail is arranged on the slider, the moving seat is sleeved on the slide rail, the upper end surface of the slide rail is provided with a second tooth groove along its axial direction, the upper end surface of the moving seat is provided with a second motor, the output shaft of the second motor is installed with a gear, the upper end surface of the moving seat is provided with a first notch along its axial direction, the bottom of the gear passes through the first notch and meshes with the second tooth groove, and a mounting plate is also provided on the moving seat, and the fixing pin is fixed on the mounting plate; The interior of the fixing pin is a hollow structure, and an opening is provided at one end of the fixing pin, and a T-shaped seat is provided at the opening. A through hole is provided on the central axis of the T-shaped seat, and a push rod is provided in the through hole. A push plate is provided at one end of the push rod, and the other end of the push rod is located in the hollow structure and has mutually symmetrical protrusions on its outer wall. A limiting block is provided on the protrusion, and a limiting plate is provided on the outer side wall at the bottom of the limiting block. The limiting block and the protrusion are connected by a second compression spring, and a second notch matching the limiting block is provided on the cylinder wall of the fixing pin, and an elastic steel sheet is provided in the second notch, and the center of the elastic steel sheet is recessed inward to form a curved portion, and the curved portion is located in the hollow structure.

2. The adjustable top pipe stop bracket according to claim 1, characterized in that: A plurality of limit grooves are arranged on the two symmetrical inner walls of the movable seat along the length direction thereof, balls are arranged in the limit grooves, 1 / 3 of the volume of the balls are exposed outside the limit grooves, a W-shaped rail groove is arranged on the side wall of the slide rail along the length direction thereof, and the balls are in rolling contact with the raised parts of the W-shaped rail grooves.

3. The adjustable jacking pipe stop bracket according to claim 1, characterized in that: The inner wall of the perforation of the T-shaped seat is provided with a convex strip, the side wall of the push rod is provided with a groove matched with the convex strip, and the inner end surface of the hollow structure is provided with a limiting cylinder, and the limiting cylinder and the push rod are located on the same axis.

4. A method for preventing retreat of an adjustable jacking pipe preventing support according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1: First, assemble the front bracket, auxiliary bracket, rear bracket, lateral bracket, vertical bracket and connecting bracket according to the length of the pipe section and the position of the lifting hole to form a stop bracket; Step 2: Install the vertical adjustment mechanism and the horizontal adjustment mechanism; Step 3: Manually press the adjustment block, the adjustment block moves into the installation groove, the first tooth groove is disengaged from the tooth, and the adjustment seat is moved up and down along the vertical rod, so that the fixing pin and the lifting hole are located on the same horizontal axis; then start the first motor, the slider moves horizontally on the screw rod, and the left and right positions of the slider are adjusted so that the fixing pin is aligned with the lifting hole; Step 4: Start the second motor, the driving gear meshes with the second tooth groove, drives the moving seat to move along the slide rail, and the fixing pin approaches the lifting hole and is inserted into the lifting hole; Step 5: Push the push plate and the push rod to move into the hollow structure. During the movement, the limit block squeezes the elastic steel sheet to bend outward, thereby supporting the inside of the lifting hole, increasing the contact resistance between the fixing pin and the lifting hole, and fixing the pipe joint.

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