Hard rock steel pipe jacking rotary pipe pulling device and construction method

Abstract

The application relates to the technical field of municipal engineering construction facilities, in particular discloses a hard rock steel pipe jacking rotating pipe withdrawing device and a construction method. The device is provided with a rotating hydraulic jack and a box-shaped jacking iron, the box-shaped jacking iron is provided with a driven steel wheel, and a plurality of pipe withdrawing driving hydraulic jacks and annular jacking irons are further arranged, the annular jacking iron is provided with a plurality of steel wheels and arc-shaped wedge-shaped steel blocks, the box-shaped jacking iron is pushed by the rotating hydraulic jack, and the annular jacking iron is pushed by the pipe withdrawing driving hydraulic jack, so that the pipe jacking pipe withdrawing is started. The application solves the problem that the rubber outer sleeve pipe of the pipe jacking connecting part is blocked in the hole during the pipe jacking pipe withdrawing, the rubber outer sleeve pipe can smoothly pass through the hole through the twisting of the pipe jacking pipe to a certain extent during the pipe withdrawing, the pipe jacking pipe is twisted to a certain extent through the connection of the arc-shaped wedge-shaped steel blocks during the pipe jacking pipe withdrawing, and thus the pipe jacking pipe withdrawing is more easily started in the initial stage.

Description

Technical Field

[0001] This invention relates to the field of municipal engineering construction facilities technology, and in particular to a hard rock steel jacking pipe rotating and withdrawing device and construction method. Background Technology

[0002] Pipe jacking is a widely used cut-and-cover construction method for tunneling or underground pipelines through various obstacles such as railways, roads, rivers, or buildings. It involves using hydraulic jacks to advance the pipes sequentially from the starting shaft, while mechanical excavation removes the soil ahead. Finally, the pipes are effectively connected to form a complete pipeline. Currently, pipe jacking is widely used in urban areas for heating, gas, water supply, drainage, power lines, and underground passages. It offers advantages such as minimal excavation, minimal impact on traffic and the surrounding environment, and strong adaptability to construction.

[0003] However, the current pipe jacking method still has some limitations:

[0004] 1. When encountering obstacles that cannot be removed during pipe jacking construction, and directional demolition using ground excavation fails to clear the obstacles, it is necessary to remove the jacked pipe and the tunneling machine.

[0005] 2. When the tunnel boring machine encounters a malfunction that cannot be resolved, and other methods such as changing the jacking direction cannot meet the project requirements, it is necessary to remove the jacked pipe and the tunnel boring machine.

[0006] 3. When retracting steel jacking pipes, the rubber sleeves at the welded joints of the jacking pipes are prone to blockage at the opening, making retraction difficult.

[0007] Due to the limitations of the aforementioned pipe jacking method, some pipe jacking projects necessitate pipe retraction. Currently, the commonly used pipe retraction method primarily involves using hydraulic cylinders to pull the jacking pipe in the reverse direction. The jacking pipe itself must be welded or threaded to the pipe jacking machine head to form a single unit, gradually pulling the pipe out. The current pipe retraction method suffers from the following problems:

[0008] 1. When steel jacking pipes are being withdrawn, the rubber sleeves at the welded joints of the jacking pipes are prone to getting clogged at the opening, making it difficult to withdraw the pipes.

[0009] 2. When the length of the already advanced section is relatively long, the process of retracting the tube is difficult. Summary of the Invention

[0010] In order to overcome the shortcomings of the prior art, the present invention provides a time-saving and labor-saving hard rock steel jacking pipe rotary pipe withdrawal device and construction method.

[0011] This invention is achieved through the following technical solution:

[0012] A rotary pipe-retreating device for hard rock steel jacking, characterized in that it includes a rotary drive system and a direct retraction drive system, wherein:

[0013] The rotary drive system includes an even number of rotary hydraulic jacks perpendicular to the jacking pipe and a box-shaped jack. One end of the box-shaped jack has a driven groove, and a driven steel wheel is installed in the driven groove. The axis of the driven steel wheel is perpendicular to both the rotary hydraulic jack and the jacking pipe. Arc-shaped hoops are provided at the upper and lower ends of the driven steel wheel. The box-shaped jack is also welded with a jack cover plate with an opening. A part of the driven steel wheel extends out of the opening, and the support shoe of the rotary hydraulic jack rests on the driven steel wheel.

[0014] The direct retraction drive system includes an even number of retraction drive hydraulic jacks parallel to the jacking pipe and an annular jack with a track notch. The annular jack is used to fix the pipe to the outer end. Each retraction drive hydraulic jack has an arc-shaped retraction sliding groove on its annular jack. The arc-shaped retraction sliding groove is equipped with a rotating steel wheel and an arc-shaped wedge steel block. A groove cover plate is welded to the arc-shaped retraction sliding groove to seal the rotating steel wheel and the arc-shaped wedge steel block inside the groove. The groove cover plate has a hollow hole. The arc-shaped wedge steel block is connected to a support block. The support block extends out from the hollow hole. After the retraction drive hydraulic jack extends out, it can hold the support block.

[0015] The upper and lower arc surfaces of the arc-shaped wedge-shaped steel block are respectively provided with ring hoops;

[0016] Steel balls are placed inside the arc-shaped hoop and the ring hoop, and the thickness of the arc-shaped hoop and the ring hoop is smaller than the diameter of the steel balls.

[0017] The lower end of the box-shaped top iron is arc-shaped and matches the top pipe. It is welded to the top pipe during use.

[0018] Both the arc-shaped hoop and the ring hoop are provided with notches for filling steel balls.

[0019] The thickness of the arc-shaped hoop and the ring hoop is 6 mm, the diameter of the steel ball is 10 mm, and the width of the notch is 20 mm; there are two box-shaped top irons, symmetrically arranged around the axis of the top pipe; the driven groove is 180 mm long, 120 mm wide, and 70 mm deep; the driven steel wheel is 100 mm in diameter and 100 mm high; and the opening is 140 mm long and 110 mm wide.

[0020] The thickness of the annular top iron is 300 mm, the width along the axis of the top tube is 300 mm, the center chord length of the arc-shaped tube retraction sliding groove is 180 mm, the width is 120 mm, and the depth is 160 mm, the diameter of the rotating steel wheel is 70 mm, the length of the support block is 80 mm, the width is 80 mm, the thickness is 20 mm, and the center chord length of the hollow hole is 140 mm and the width is 90 mm.

[0021] The thickness of the top iron cover plate and the groove cover plate is 10 mm.

[0022] The construction method for steel pipe jacking and withdrawal in hard rock is characterized by:

[0023] 1) Construction preparation

[0024] The starting point and sidewalls of the working well are reinforced to form a pipe retraction drive reaction wall and a rotation drive reaction wall. A 40mm thick back iron plate is laid on the surface of the reaction wall. A jack support is prefabricated by welding 30# I-beams and 20mm thick steel plates and erected on both sides of the starting point. φ25 steel bars are used to install rebars on both sides of the starting point and sidewalls. The rebars are welded to the back iron plate and the jack rebars to ensure overall stability.

[0025] 2) Setting up the hydraulic jack driven by the pipe retraction mechanism

[0026] The retraction drive hydraulic jacks are arranged parallel to the jacking pipe axis, and two of them are symmetrical about the jacking pipe axis. The base of the retraction drive hydraulic jacks is supported on the reaction wall next to the starting hole.

[0027] 3) Setting up the rotary hydraulic jack

[0028] The rotary hydraulic jacks are arranged perpendicular to the jacking pipe axis, and all rotary hydraulic jacks are evenly distributed around the jacking pipe axis; the bases of the rotary hydraulic jacks are respectively supported on the reaction walls on both sides of the starting hole of the working shaft.

[0029] 4) Assembly of the rotary drive system

[0030] Weld the notched arc-shaped hoop to the upper and lower bottom surfaces of the driven steel wheel respectively. Place the driven steel wheel into the driven groove of the box-shaped top iron with the notch facing outward. Place the steel ball into the arc-shaped hoop through the reserved notch. Weld the top iron cover plate to the box-shaped top iron and make the opening pass through the top of the driven steel wheel so that the driven steel wheel protrudes from the reserved opening.

[0031] The arc-shaped bottom surface of the box-shaped top iron, which has been assembled and welded, is attached to the top and bottom of the jacking pipe. Welding connections are made in front of the support shoes of the rotating hydraulic jacks at the top and bottom of the jacking pipe, respectively. Before the rotation operation, the support shoes of the rotating hydraulic jacks are positioned where the driven steel wheel protrudes from the opening in the top iron cover plate, and the rotation drive system assembly is ready.

[0032] 5) Assembly of the direct-drive system

[0033] First, place the annular top iron flat on the ground. Weld ring hoops around the inner and outer arc surfaces of the arc-shaped wedge-shaped steel block, with the notches facing the support block. First, position the rotating steel wheel to the bottom of the arc-shaped tube-retarding sliding groove. Then, place the arc-shaped wedge-shaped steel block into the arc-shaped tube-retarding sliding groove and rest it against the rotating steel wheel, with the support block facing outward. Insert steel balls through the notches into the ring hoops to facilitate the relative sliding between the annular top iron and the arc-shaped wedge-shaped steel block when the jacking pipe rotates. Pass the perforated hole of the groove cover plate through the support block and weld it to the side of the annular top iron, with the support block protruding from the perforated hole.

[0034] The annular jacking iron is hoisted to the pipe retraction point at the pipe jacking opening, so that its inner arc surface fits against the outer wall of the pipe jacking. The support shoe of the retraction drive hydraulic jack is adjusted to rest on the support block and welded together. The assembly of the direct retraction drive system is now complete.

[0035] 6) Rotate the pipe to start construction

[0036] The retraction of the jacking pipe is controlled by observing the retraction distance and the rotation arc length: the stroke of the rotary hydraulic jack and the retraction drive hydraulic jack are observed; after the installation and debugging of each component are completed, the rotary hydraulic jack and the retraction drive hydraulic jack are started simultaneously. Under the action of the retraction drive hydraulic jack, the jacking pipe makes a translational movement in the opposite direction of the jacking axis, and the driven steel wheel in the rotary drive system starts to roll, but maintains continuous contact with the rotary hydraulic jack support shoe to ensure the continuous application of rotational power;

[0037] Under the action of the rotary hydraulic jack, the jacking pipe rotates around the axial center point of the jacking pipe. The annular jacking iron in the direct retraction drive system rotates coaxially with the jacking pipe, causing the rotating steel wheel to start rolling. Due to the rolling of the rotating steel wheel, the arc-shaped wedge steel block can maintain movement only along the axial direction of the jacking pipe during the rotation of the annular jacking iron, without any relative change in position with the retraction drive hydraulic jack, thus ensuring the continuous retraction of the pipe.

[0038] After the pipe jacking retraction is started, the rotary hydraulic jack is retracted and the rotational power application is stopped to avoid excessive pipe retraction distance. The driven steel wheel rolls out of the range of the rotary hydraulic jack support shoe. The pipe retraction drive hydraulic jack continues to work, and the rotary pipe retraction start is completed.

[0039] After one jacking pipe is withdrawn, the interring connection of the jacking pipe is cut off and lifted out of the working shaft; the annular jacking iron and the box-shaped jacking iron are cut off and welded to the next jacking pipe for continued use.

[0040] The beneficial effects of this invention are:

[0041] 1. To solve the problem of the rubber outer sleeve blocking the opening at the connection of the steel jacking pipe during pipe withdrawal, the rubber outer sleeve is allowed to pass through the opening smoothly by a certain degree of twisting of the jacking pipe during the withdrawal process.

[0042] 2. The connection of the arc-shaped wedge-shaped steel blocks causes a certain degree of torsion during the pipe jacking process, making it easier to start the initial stage of pipe jacking. Attached Figure Description

[0043] The invention will now be further described with reference to the accompanying drawings:

[0044] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0045] Figure 2 This is a schematic diagram of the right-side structure of the present invention;

[0046] Figure 3 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ;

[0047] Figure 4 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ;

[0048] Figure 5 A schematic diagram of the split structure of the rotary hydraulic jack and the internal structure of the driven groove;

[0049] Figure 6 for Figure 5 Enlarged structural diagram at point A;

[0050] Figure 7 A schematic diagram of the separate structure of the hydraulic jack for retracting the tube and the internal structure of the arc-shaped retracting sliding groove;

[0051] Figure 8 for Figure 1 A schematic diagram of the rear view structure of the central annular top iron;

[0052] Figure 9 A schematic diagram of the three-dimensional structure of the arc-shaped wedge-shaped steel block;

[0053] Figure 10 This is a schematic diagram of the main structural view of the arc-shaped wedge-shaped steel block;

[0054] Figure 11 This is a rear view schematic diagram of the arc-shaped wedge-shaped steel block.

[0055] In the diagram, 1 is the jacking pipe, 2 is the rotary hydraulic jack, 3 is the box-shaped jacking iron, 4 is the driven groove, 5 is the driven steel wheel, 6 is the arc-shaped hoop, 7 is the notch, 8 is the steel ball, 9 is the opening, 10 is the jacking iron cover plate, 11 is the support shoe, 12 is the pipe retraction drive hydraulic jack, 13 is the track notch, 14 is the annular jacking iron, 15 is the arc-shaped pipe retraction sliding groove, 16 is the rotating steel wheel, 17 is the arc-shaped wedge-shaped steel block, 18 is the ring hoop, 19 is the support block, 20 is the groove cover plate, and 21 is the hollow hole. Detailed Implementation

[0056] The attached figures illustrate specific embodiments of the present invention. Figures 1 to 11 As shown, this hard rock steel jacking rotary pipe retraction device includes a rotary drive system and a direct retraction drive system, wherein:

[0057] The rotary drive system includes an even number of rotary hydraulic jacks 2 perpendicular to the jacking pipe 1 and box-shaped jacks 3. All the rotary hydraulic jacks 2 are evenly arranged around the axis of the jacking pipe 1. Taking two rotary hydraulic jacks 2 as an example, each rotary hydraulic jack 2 is equipped with a box-shaped jack 3. One end of the box-shaped jack 3 has a driven groove 4. When facing the driven groove 4, the horizontal length at the outlet of the driven groove 4 is 180 mm, the vertical width is 120 mm, and the depth of the driven groove 4 is 70 mm. A driven steel wheel 5 is placed inside the driven groove 4. The diameter of the driven steel wheel 5 is 100 mm, and the height (corresponding to the width of the driven groove 4) is 100 mm. Thus, 30 mm of the wheel protrudes outside the driven groove 4. An arc-shaped hoop 6 is welded to the upper and lower bottom surfaces of the moving steel wheel 5. The thickness of the arc-shaped hoop 6 (in the direction of the length of the moving steel wheel 5) is 6 mm. The arc-shaped hoop 6 has a notch 7 for placing steel balls 8 inside. The width of the notch 7 can be 20 mm. After the steel balls 8 are placed, the steel balls 8 in the two arc-shaped hoop 6 contact the upper and lower surfaces of the driven groove 4 respectively. Then, a top iron cover plate 10 with an opening 9 is welded to the box-shaped top iron 3. The thickness of the top iron cover plate 10 is 10 mm, so that 20 mm of the driven steel wheel 5 is exposed outside. After the rotary hydraulic jack 2 is started, the support shoe 11 of the rotary hydraulic jack 2 rests on the driven steel wheel 5. When facing the opening 9, the opening 9 is 140 mm long on the left and right and 110 mm wide on the top and bottom.

[0058] The lower end of the box-shaped top iron 3 is an arc shape that matches the jacking pipe 1, making it easy to weld the box-shaped top iron 3 onto the jacking pipe 1 during use.

[0059] The direct retraction drive system includes an even number of retraction drive hydraulic jacks 12 parallel to the jacking pipe 1 and an annular jacking iron 14 with a track notch 13. These retraction drive hydraulic jacks 12 are arranged in pairs, and the two retraction drive hydraulic jacks 12 are arranged symmetrically about the axis of the jacking pipe 1.

[0060] An annular jack 14 is used to fix the outer end of the jacking pipe 1. Each annular jack 14 in front of the jacking pipe drive hydraulic jack 12 has an arc-shaped sliding groove 15 for pipe retraction. When facing the arc-shaped sliding groove 15, its centerline chord length in the left-right direction is 180 mm, its width in the up-down direction is 120 mm, and its depth inward is 160 mm. Two rotating steel wheels 16 are installed inside the arc-shaped sliding groove 15. The diameter of the rotating steel wheels 16 is 70 mm. The rotating steel wheels 16 can rotate within the arc-shaped sliding groove 15 under external force. An arc-shaped wedge-shaped steel block 17 is placed close to the rotating steel wheels 16. A ring hoop 18 is welded to both the upper and lower arc surfaces of the arc-shaped wedge-shaped steel block 17. The ring hoop 18 has an outward notch 7 and a thickness of 6 mm. A steel ball 8 with a diameter of 10 mm is placed inside the ring hoop 18 and then inserted into the arc-shaped sliding groove 15. Afterwards, the steel balls 8 inside the upper and lower rings 18 respectively contact the inner surface of the arc-shaped tube retraction sliding groove 15; a cuboid support block 19 is welded to the outward-facing fan surface of the arc-shaped wedge-shaped steel block 17. When facing the support block 19, its length in the left and right direction is 80 mm, its width in the up and down direction is 80 mm, and its thickness in the front and back direction is 20 mm. A groove cover plate 20 is welded at the arc-shaped tube retraction sliding groove 15. The groove cover plate 20 has a thickness of 10 mm. The inner side of the groove cover plate 20 rests on the arc-shaped wedge-shaped steel block 17, and a hollow hole 21 is opened on the groove cover plate 20. The upper and lower surfaces of the hollow hole 21 are arc-shaped. When facing the hollow hole 21, the chord length of its center line in the left and right direction is 140 mm, and its width in the up and down direction is 90 mm. The part of the support block 19 exposed outside is 10 mm. In use, the support shoe 11 of the tube retraction driving hydraulic jack 12 rests on the support block 19.

[0061] When facing the annular top iron 14, the thickness of the annular top iron 14 in the vertical direction is 300 mm, and the width along the axis of the jacking pipe 1 is 300 mm.

[0062] The specific steps for the pipe withdrawal construction method of steel jacking pipe in hard rock are as follows:

[0063] 1) Construction preparation

[0064] First, disconnect the hydraulic cylinder switch, remove the oil pipes and other related pipelines, and then remove the jack supports at the reaction wall during normal jacking. Reinforce the starting port and sidewalls of the working shaft to form a pipe-retreating drive reaction wall and a rotation drive reaction wall. A 40mm thick backing plate is laid on the surface of the reaction wall. Jack supports are prefabricated using 30# I-beams and 20mm thick steel plates and erected on both sides of the starting port. φ25 steel bars are used to reinforce the sides of the starting port and sidewalls, and these bars are welded to the backing plate and jack reinforcement to ensure overall stability.

[0065] 2) Erection of 12 hydraulic jacks for pipe retraction

[0066] The retraction drive hydraulic jack 12 is arranged parallel to the axis of the jacking pipe 1, and every two are symmetrical about the axis of the jacking pipe 1. The base of the retraction drive hydraulic jack 12 is supported on the reaction wall next to the starting hole.

[0067] 3) Erection of two rotary hydraulic jacks

[0068] Setup requirements:

[0069] The rotary hydraulic jack 2 is used to drive the jacking pipe 1 to rotate around its center point. It is mainly used for erection under the following conditions: ① The pipe retraction distance is long and the initial jacking force required is large. The rotation method overcomes the problem of difficulty in starting the pipe retraction; ② When there are rubber sleeves or other attachments on the outer wall of the jacking pipe 1, the conventional retraction method is easy to block the starting hole. The rotary hydraulic jack 2 drives the jacking pipe 1 to rotate repeatedly, twisting the rubber sleeves and other attachments out of the starting hole.

[0070] Rotary hydraulic jacks 2 are arranged in pairs, perpendicular to the axis of the jacking pipe 1. All rotary hydraulic jacks 2 are evenly distributed around the axis of the jacking pipe 1. The bases of the rotary hydraulic jacks 2 are supported on the reaction walls on both sides of the starting hole of the working shaft. The number of sets of rotary hydraulic jacks 2 can be determined according to the actual situation.

[0071] Installation Precautions:

[0072] The rotary hydraulic jack 2 needs to drive the jacking pipe 1 to rotate. It is necessary to control the position of the top and bottom jacking force to be consistent with the center point of the jacking pipe 1 to avoid eccentric twisting of the jacking pipe 1.

[0073] ② Strictly control the cylinder stroke of the top and bottom rotating hydraulic jacks 2 to avoid one of the rotating hydraulic jacks 2 extending its cylinder too far while the other rotating hydraulic jack 2 is not fully extended.

[0074] ③ Since the steel jacking pipe 1 is relatively long, in order to avoid damage to the jacking pipe 1 caused by the rotation driven by the rotating hydraulic jack 2, the distance from the position of the box-type jacking iron 3 to the edge of the cross-section of the jacking pipe 1 should not be less than 1m, and it is preferable to be within one-third of the axial direction of the jacking pipe 1.

[0075] ④ Since the rotary hydraulic jack 2 needs to be arranged perpendicular to the axis of the jacking pipe 1, the model and size of the rotary hydraulic jack 2 need to be selected by comprehensively considering factors such as the distance between the walls on both sides of the working shaft and the thickness of the reaction wall of the rotary hydraulic jack 2. If necessary, lateral auxiliary support components such as steel pipe concrete can be added as reaction support components of the rotary hydraulic jack 2.

[0076] ⑤ The addition of the rotary drive system needs to take into account the actual situation of the rotary pipe retraction and the on-site construction conditions, and pay attention to the symmetrical arrangement with the first group of rotary drive devices; start them separately for jacking. When the first group starts, the second group of cylinders should be retracted. After the first group of jacking is completed and the cylinders are retracted, the second group of jacking can start.

[0077] 4) Assembly of the rotary drive system

[0078] Weld the arc-shaped hoop 6 with notch 7 to the upper and lower bottom surfaces of the driven steel wheel 5 respectively. Place the driven steel wheel 5 into the driven groove 4 of the box-shaped top iron 3 with the notch 7 facing outward. Place the steel ball 8 into the arc-shaped hoop 6 through the reserved notch 7. Weld the top iron cover plate 10 to the box-shaped top iron 3 and make the opening 9 pass through the top of the driven steel wheel 5 so that the driven steel wheel 5 is exposed from the reserved opening 9.

[0079] The arc-shaped bottom surface of the box-shaped top iron 3, which has been assembled and welded, is attached to the top and bottom of the top pipe 1. Welding is then performed in front of the support shoe 11 of the rotating hydraulic jack 2 at the top and bottom of the top pipe 1, respectively. Before the rotation operation, the support shoe 11 of the rotating hydraulic jack 2 is placed on the part where the driven steel wheel 5 is exposed from the opening 9 of the top iron cover plate 10, and the rotation drive system assembly is ready.

[0080] 5) Assembly of the direct-drive system

[0081] First, place the annular top iron flat on the ground. Weld ring hoops 18 around the inner and outer arc surfaces of the arc-shaped wedge steel block 17, with the notch 7 facing the support block 19. Place the rotating steel wheel 16 inside the arc-shaped tube retraction sliding groove 15. Weld the central shafts at both ends of the rotating steel wheel 16 to the upper and lower arc surfaces of the arc-shaped tube retraction sliding groove 15. Then, place the arc-shaped wedge steel block 17 into the arc-shaped tube retraction sliding groove 15 and rest it against the rotating steel wheel 16, with the support block 19 facing outward. Insert the steel ball 8 into the ring hoop 18 through the notch 7 to facilitate the relative sliding between the annular top iron 14 and the arc-shaped wedge steel block 17 when the top pipe 1 rotates. Pass the hollow hole 21 of the groove cover plate 20 through the support block 19 and weld it to the side of the annular top iron. The support block 19 protrudes from the hollow hole 21.

[0082] The annular jack is hoisted to the outer end of the jacking pipe 1 at the pipe retraction point, so that its inner arc surface fits against the outer wall of the jacking pipe 1. The support shoe 11 of the retraction drive hydraulic jack 12 is adjusted to rest on the support block 19, and the assembly of the direct retraction drive system is completed.

[0083] 6) Rotate the pipe to start construction

[0084] The retraction of the jacking pipe is controlled by observing the retraction distance and the rotation arc length: the stroke of the rotary hydraulic jack 2 and the retraction drive hydraulic jack 12 are observed; after the installation and debugging of each component are completed, the rotary hydraulic jack 2 and the retraction drive hydraulic jack 12 are started at the same time. Under the action of the retraction drive hydraulic jack 12, the jacking pipe 1 makes a translational movement in the opposite direction of the jacking axis. The driven steel wheel 5 in the rotary drive system starts to roll, but maintains continuous contact with the support shoe 11 of the rotary hydraulic jack 2, ensuring the continuous application of rotational power.

[0085] Under the action of the rotary hydraulic jack 2, the jacking pipe 1 rotates around the axial center point of the jacking pipe 1. The annular jacking iron 14 in the direct retraction drive system rotates coaxially with the jacking pipe 1, causing the rotating steel wheel 16 to start rolling. Due to the rolling of the rotating steel wheel 16, the arc-shaped wedge steel block 17 can maintain movement only along the axial direction of the jacking pipe 1 during the rotation of the annular jacking iron 14, without any relative change in position with the retraction drive hydraulic jack 12, thus ensuring the continuous retraction of the pipe.

[0086] After the pipe jacking 1 starts retracting, the cylinder of the rotary hydraulic jack 2 is retracted, and the rotational power application is stopped to avoid excessive pipe retraction distance. The driven steel wheel 5 rolls out of the range of the support shoe 11 of the rotary hydraulic jack 2; the pipe retraction drive hydraulic jack 12 continues to work, and the rotary pipe retraction start is completed.

[0087] After the jacking pipe 1 is withdrawn, the interring connection of the jacking pipe 1 is cut off and lifted out of the working shaft; the annular jacking iron 14 and the box-shaped jacking iron 3 are cut off and welded to the next jacking pipe 1 for continued use.

[0088] Except for the technical features described in the specification, all other technical features are known to those skilled in the art.

Claims

1. A rotary pipe-retreating device for hard rock steel jacking, characterized in that, This includes rotary drive systems and linear retraction drive systems, among which: The rotary drive system includes an even number of rotary hydraulic jacks (2) perpendicular to the jacking pipe (1) and a box-shaped jack (3). One end of the box-shaped jack (3) has a driven groove (4). A driven steel wheel (5) is provided in the driven groove (4). The axis of the driven steel wheel (5) is perpendicular to the rotary hydraulic jack (2) and the jacking pipe (1) respectively. Arc-shaped hoops (6) are provided at the upper and lower ends of the driven steel wheel (5). The box-shaped jack (3) is also welded with a jack cover plate (10) with an opening (9). A part of the driven steel wheel (5) extends out from the opening (9). The support shoe (11) of the rotary hydraulic jack (2) rests on the driven steel wheel (5). The direct retraction drive system includes an even number of retraction drive hydraulic jacks (12) parallel to the jacking pipe (1) and an annular jack (14) with a track notch (13). The annular jack (14) is used to fix the pipe to the outer end of the jacking pipe (1). Each retraction drive hydraulic jack (12) has an arc-shaped retraction sliding groove (15) in front of the annular jack (14). The arc-shaped retraction sliding groove (15) is provided with a rotating steel wheel (16) and an arc-shaped wedge-shaped steel block (17). A groove cover plate (20) is welded to the arc-shaped tube retraction sliding groove (15) to seal the rotating steel wheel (16) and the arc-shaped wedge steel block (17) inside the arc-shaped tube retraction sliding groove (15). The groove cover plate (20) has a hollow hole (21). The arc-shaped wedge steel block (17) is connected to the support block (19). The support block (19) extends out from the hollow hole (21). After the tube retraction driving hydraulic jack (12) extends out, it can hold the support block (19). The upper and lower arc surfaces of the arc-shaped wedge steel block (17) are respectively provided with ring hoops (18); Steel balls (8) are placed inside the arc-shaped hoop (6) and the ring hoop (18), and the thickness of the arc-shaped hoop (6) and the ring hoop (18) is smaller than the diameter of the steel balls (8).

2. The hard rock steel jacking pipe rotary pipe withdrawal device according to claim 1, characterized in that, The lower end of the box-shaped top iron (3) is an arc shape that matches the top pipe (1), and it is welded to the top pipe (1) during use.

3. The hard rock steel jacking pipe rotary pipe withdrawal device according to claim 1, characterized in that, Both the arc-shaped hoop (6) and the ring hoop (18) are provided with notches (7) for filling steel balls (8).

4. The hard rock steel jacking pipe rotary pipe withdrawal device according to claim 3, characterized in that, The thickness of the arc-shaped hoop (6) and the ring hoop (18) is 6 mm, the diameter of the steel ball (8) is 10 mm, and the width of the notch (7) is 20 mm; there are two box-shaped top irons (3), which are symmetrically arranged with respect to the axis of the top pipe (1); the driven groove (4) is 180 mm long, 120 mm wide, and 70 mm deep; the driven steel wheel (5) is 100 mm in diameter and 100 mm high; and the opening (9) is 140 mm long and 110 mm wide. The thickness of the annular top iron (14) is 300 mm, the width along the axis of the top tube (1) is 300 mm, the center line chord length of the arc-shaped tube retraction sliding groove (15) is 180 mm, the width is 120 mm, and the depth is 160 mm, the diameter of the rotating steel wheel (16) is 70 mm, the length of the support block (19) is 80 mm, the width is 80 mm, and the thickness is 20 mm, and the center line chord length of the hollow hole (21) is 140 mm and the width is 90 mm. The thickness of the top iron cover plate (10) and the groove cover plate (20) is 10 mm.

5. The construction method of the hard rock steel pipe jacking rotary pipe withdrawal device according to claim 4, characterized in that, 1) Construction preparation The starting point and sidewalls of the working well are reinforced to form a pipe retraction drive reaction wall and a rotation drive reaction wall. A 40mm thick back iron plate is laid on the surface of the reaction wall. A jack support is prefabricated by welding 30# I-beams and 20mm thick steel plates and erected on both sides of the starting point. φ25 steel bars are used to install rebars on both sides of the starting point and sidewalls. The rebars are welded to the back iron plate and the jack rebars to ensure overall stability. 2) Erecting the hydraulic jack (12) driven by the pipe retraction mechanism. The retraction drive hydraulic jack (12) is arranged parallel to the axis of the jacking pipe (1), and two of them are symmetrical about the axis of the jacking pipe (1). The base of the retraction drive hydraulic jack (12) is supported on the reaction wall next to the starting hole. 3) Erection of rotary hydraulic jack (2) Rotary hydraulic jacks (2) are arranged perpendicular to the axis of the jacking pipe (1), and all rotary hydraulic jacks (2) are evenly distributed around the axis of the jacking pipe (1); the bases of the rotary hydraulic jacks (2) are respectively supported on the reaction walls of the side walls on both sides of the starting hole of the working shaft; 4) Assembly of the rotary drive system Weld the arc-shaped hoop (6) with the notch (7) to the upper and lower bottom surfaces of the driven steel wheel (5) respectively. Place the driven steel wheel (5) into the driven groove (4) of the box-shaped top iron (3) with the notch (7) facing outward. Place the steel ball (8) into the arc-shaped hoop (6) through the reserved notch (7). Weld the top iron cover plate (10) to the box-shaped top iron (3) and make the opening (9) pass through the top of the driven steel wheel (5) so that the driven steel wheel (5) is exposed from the reserved opening (9). The arc-shaped bottom surface of the box-shaped top iron (3) after the combination welding is attached to the top and bottom of the top pipe (1), and the support shoe (11) of the rotating hydraulic jack (2) at the top and bottom of the top pipe (1) is welded together; before the rotation operation, the support shoe (11) of the rotating hydraulic jack (2) is placed on the part where the driven steel wheel (5) is exposed from the opening (9) of the top iron cover plate (10), and the rotation drive system assembly is ready; 5) Assembly of the direct-drive system First, place the annular top iron (14) flat on the ground. Weld ring hoops (18) around the upper and lower arc surfaces of the arc-shaped wedge steel block (17), with the notch (7) facing the side of the support block (19). First, place the rotating steel wheel (16) to the bottom of the arc-shaped tube retraction sliding groove (15). Then, place the arc-shaped wedge steel block (17) into the arc-shaped tube retraction sliding groove (15) and place it against the rotating steel wheel (16). With the support block (19) facing outward, place the steel ball (8) into the ring hoop (18) through the notch (7) to facilitate the relative sliding of the annular top iron (14) and the arc-shaped wedge steel block (17) when the top pipe (1) rotates. Pass the hollow hole (21) of the groove cover plate (20) through the support block (19) and weld it to the side of the annular top iron (14). The support block (19) protrudes from the hollow hole (21). The annular top iron (14) is hoisted to the pipe retraction point at the opening of the jacking pipe (1), so that its inner arc surface fits against the outer wall of the jacking pipe (1). The support shoe (11) of the retraction drive hydraulic jack (12) is adjusted to rest on the support block (19) and welded together. The assembly of the direct retraction drive system is now complete. 6) Rotate the pipe to start construction The retraction start is controlled by observing the retraction distance and the rotation arc length: the stroke of the rotary hydraulic jack (2) and the retraction drive hydraulic jack (12) is observed; after the installation and debugging of each component is completed, the rotary hydraulic jack (2) and the retraction drive hydraulic jack (12) are started at the same time. Under the action of the retraction drive hydraulic jack (12), the jacking pipe (1) makes a translational movement in the opposite direction of the jacking axis. The driven steel wheel (5) in the rotary drive system starts to roll, but maintains continuous contact with the support shoe (11) of the rotary hydraulic jack (2), ensuring the continuous application of rotational power. Under the action of the rotary hydraulic jack (2), the jacking pipe (1) rotates around the axial center point of the jacking pipe (1). The annular jacking iron (14) in the direct retraction drive system rotates coaxially with the jacking pipe (1), causing the rotating steel wheel (16) to start rolling. Due to the rolling of the rotating steel wheel (16), the arc-shaped wedge steel block (17) can maintain movement only along the axial direction of the jacking pipe (1) during the rotation of the annular jacking iron (14), without any relative change in position with the retraction drive hydraulic jack (12), thus ensuring the continuous retraction of the pipe. After the pipe jacking (1) is started, the rotary hydraulic jack (2) is retracted and the rotational power is stopped to avoid the pipe jacking distance being too long. The driven steel wheel (5) rolls out of the range of the support shoe (11) of the rotary hydraulic jack (2); the pipe jacking drive hydraulic jack (12) continues to work, and the rotary pipe jacking start is completed; After the jacking pipe (1) is withdrawn, the inter-ring connection of the jacking pipe (1) is cut off and the working well is lifted out; the annular top iron (14) and the box-shaped top iron (3) are cut off and welded to the next jacking pipe (1) for continued use.

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