Punch-in type prestressed concrete hole rod forming device and production process

Abstract

The present application relates to the technical field of building construction, in particular to a kind of through pre-stressed concrete hole rod empty device and production process of forming. Including pipe body, the inside of pipe body is equipped with the support mechanism for supporting pipe body inner wall, the inside of pipe body is also equipped with sealing mechanism and auxiliary mechanism;When support mechanism supports pipe body inner wall, sealing mechanism is sealed to the both sides of pipe body, simultaneously, support mechanism drives auxiliary mechanism to be elastically moved and be resisted with sealing mechanism, and auxiliary mechanism is clamped between sealing mechanism.This application is sealed to the port of pipe body by manually pushing moving plate, driving No.1 sealing ring, moving plate moves and drives support plate to expand and support around pipe body inner wall, when injecting concrete around pipe body subsequently, concrete will produce lateral pressure to pipe body, and support around pipe body inner wall, can effectively resist this lateral pressure, improve the overall carrying capacity of pipe body.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction, in particular to a penetrating type prestressed concrete duct rod forming device and production process. BACKGROUND

[0002] Concrete is one of the most important civil engineering materials in the contemporary era, which is a kind of artificial stone made of cementitious materials, granular aggregates, water, and if necessary, additives and admixtures, according to certain proportions, uniform mixing, compaction, curing and hardening. In prestressed concrete structures, prestressed reinforcement is a key element. In order to make it easier for the prestressed reinforcement to penetrate the concrete member, a hole is first reserved by a hole forming device during the construction of a prestressed concrete beam. After the concrete reaches a certain strength, the prestressed reinforcement such as steel strand is inserted into the hole to improve the crack resistance and load-carrying capacity of the beam.

[0003] The existing concrete hole forming device relies only on the strength of the pipe wall to resist the lateral pressure generated during the pouring of concrete. However, in the case of mass concrete pouring or fast concrete pouring, the lateral pressure is large, and the pipe is prone to deformation, which may cause local depression or bending, resulting in changes in the shape of the hole. The change in the shape of the hole may affect the subsequent insertion of the prestressed reinforcement, thereby affecting the construction quality and performance of the prestressed concrete structure. In view of this, a penetrating type prestressed concrete duct rod forming device and production process are proposed. SUMMARY

[0004] The present application aims to provide a penetrating type prestressed concrete duct rod forming device and production process to solve the problems raised in the background.

[0005] To solve the above technical problems, one of the purposes of the present application is to provide a penetrating type prestressed concrete duct rod forming device, which comprises a pipe body, a support mechanism for supporting the inner wall of the pipe body is arranged inside the pipe body, and a sealing mechanism and an auxiliary mechanism are also arranged inside the pipe body.

[0006] When the support mechanism supports the inner wall of the pipe body, it drives the sealing mechanism to seal both sides of the pipe body. At the same time, the support mechanism drives the auxiliary mechanism to move elastically and abut against the sealing mechanism, and the auxiliary mechanism is clamped between the sealing mechanism.

[0007] As a further improvement of the present technical solution, the support mechanism comprises a fixed plate fixedly connected to the inner wall of the pipe body, a connecting rod fixedly connected to the center of the fixed plate, a sliding rod slidingly connected to the outer wall of the connecting rod, a plurality of through slots formed in the fixed plate, a support plate slidingly connected in each through slot, a rotating rod rotatably connected to the outer wall of the sliding rod, and the support plate is rotatably connected to the adjacent rotating rod.

[0008] As a further improvement of the technical solution, the sealing mechanism comprises a moving plate fixedly connected to the outer wall of the sliding rod, and a first sealing ring is fixedly connected to the side of the moving plate close to the supporting plate.

[0009] As a further improvement of the technical solution, the auxiliary mechanism comprises at least a moving ring slidingly connected to the inner wall of the pipe body, and a second sealing ring is fixedly connected to the side of the moving ring close to the first sealing ring.

[0010] As a further improvement of the technical solution, the side of the moving ring close to the moving plate is fixedly connected with a hollow column, the side of the hollow column is slidingly connected with a clamping block, the side of the moving plate close to the hollow column is provided with a clamping groove, and the size of the clamping groove is matched with the size of the clamping block.

[0011] As a further improvement of the technical solution, the inner wall of the hollow column is fixedly connected with a positioning rod, the inside of the positioning rod is slidingly connected with a mounting block, the side of the clamping block close to the mounting block is provided with a groove, the groove is slidingly connected with a support column, the side of the support column away from the groove is fixedly connected with the side of the mounting block, the side of the mounting block is fixedly connected with a first reset spring, and the side of the first reset spring away from the mounting block is fixedly connected with the positioning rod.

[0012] As a further improvement of the technical solution, the side of the moving plate is slidingly connected with an extrusion rod, and the extrusion rod is parallel to the mounting block.

[0013] As a further improvement of the technical solution, the side of the moving ring close to the supporting plate is fixedly connected with a limiting block, the side of the supporting plate close to the limiting block is fixedly connected with a protruding block, the side of the protruding block is parallel to the limiting block, the side of the moving ring close to the limiting block is fixedly connected with a second reset spring, and the side of the second reset spring away from the moving ring is fixedly connected with the inner wall of the pipe body.

[0014] The second purpose of the present application is to provide a pre-stressed concrete hole rod forming production process, which is applied to the pre-stressed concrete hole rod forming device.

[0015] Step one, place the pipe body on the positioning steel bar, manually push the supporting mechanism to drive the supporting mechanism to expand and support the inner wall of the pipe body, and the sealing mechanism can seal the two sides of the pipe body;

[0016] Step two, extrude the auxiliary mechanism when the supporting mechanism moves, drive the auxiliary mechanism to move elastically and tightly fit with the sealing mechanism, at the same time, the auxiliary mechanism and the sealing mechanism are clamped, then the pipe body is fixed by a steel wire, and finally the concrete is injected around the pipe body.

[0017] Step 3: After the concrete has initially set, remove the pipe from the concrete.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. In the device and production process of the inserted prestressed concrete duct tie rod, the moving plate is manually pushed to seal the pipe end with the No. 1 sealing ring. When the moving plate moves, it causes the support plate to expand and support the inner wall of the pipe. When concrete is injected into the pipe laterally, the concrete will exert lateral pressure on the pipe. Supporting the inner wall of the pipe can effectively resist this lateral pressure and improve the overall load-bearing capacity of the pipe.

[0020] 2. In the device and manufacturing process for the insertion type prestressed concrete duct tie rod, when the rotating rod expands, it squeezes the moving ring, thereby driving the second sealing ring to move, so that the second sealing ring and the first sealing ring fit tightly together, forming a double sealing structure, which increases the reliability of the seal.

[0021] As the moving ring moves, it engages with the slot of the moving plate, effectively connecting the moving plate and the moving ring together and limiting their relative displacement at the pipe port, thus further ensuring the sealing effect of the device and the stability of the support structure. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the overall half-section structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the support mechanism structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the first cross-sectional structure of the tube body of the present invention;

[0026] Figure 5 This is an enlarged structural diagram of point A in the present invention;

[0027] Figure 6 This is a schematic diagram of the second cross-sectional structure of the tube body of the present invention;

[0028] Figure 7 This is a schematic diagram of the card block engagement state according to the present invention;

[0029] Figure 8 This is an exploded view of the auxiliary mechanism of the present invention;

[0030] Figure 9 This is a cross-sectional plan view of the hollow column of the present invention.

[0031] The meanings of the labels in the diagram are as follows:

[0032] 100. Pipe body;

[0033] 200. Support mechanism; 210. Fixed plate; 211. Connecting rod; 212. Slide rod; 213. Support plate; 214. Rotating rod;

[0034] 300. Sealing mechanism; 310. Moving plate; 311. No. 1 sealing ring; 320. Extrusion rod;

[0035] 400. Auxiliary mechanism; 410. Moving ring; 411. No. 2 sealing ring; 420. Hollow column; 421. Locking block; 422. Support column; 423. Positioning rod; 424. Mounting block; 425. No. 1 return spring; 430. Limiting block; 431. Protrusion; 432. No. 2 return spring. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Please see Figures 1-9 As shown, one of the objectives of this invention is to provide an in-situ prestressed concrete duct tie rod forming device, including a tube body 100, a support mechanism 200 for supporting the inner wall of the tube body 100, thereby improving the load-bearing capacity of the tube body 100, and a sealing mechanism 300 and an auxiliary mechanism 400 are also provided inside the tube body 100.

[0038] When the support mechanism 200 supports the inner wall of the pipe body 100, it drives the sealing mechanism 300 to seal both sides of the pipe body 100. At the same time, the support mechanism 200 drives the auxiliary mechanism 400 to move elastically and abut against the sealing mechanism 300, forming a double sealing structure, which improves the sealing effect of the device. Furthermore, the interlocking between the auxiliary mechanism 400 and the sealing mechanism 300 ensures the stability of the support mechanism 200, the sealing mechanism 300, and the auxiliary mechanism 400 during concrete pouring, thereby further improving the sealing and support effects of the device.

[0039] Specifically, such as Figures 1-4As shown, this invention takes into account existing concrete forming devices. After concrete is poured, the pipe relies solely on its own wall strength to resist the lateral pressure generated during concrete injection. When the lateral pressure is large, the pipe is prone to deformation, which may result in local depressions or bends, thus altering the shape of the duct. This alteration may affect the subsequent insertion of prestressing tendons. Therefore, a support mechanism 200 and a sealing mechanism 300 are provided. Pushing the sealing mechanism 300 causes the support mechanism 200 to expand and move, allowing the support mechanism 200 to abut against the inner wall of the pipe body 100. When concrete is injected around the pipe body 100, the pressure is transmitted through the pipe body 100 wall to the support mechanism 200, preventing the pipe body 100 from being damaged by excessive local pressure and improving the overall load-bearing capacity of the pipe body 100.

[0040] Furthermore, considering the need to enhance the sealing effect of the sealing mechanism 300 at the port of the pipe body 100, an auxiliary mechanism 400 is provided. When the sealing mechanism 300 drives the support mechanism 200 to move, the support mechanism 200 squeezes the auxiliary mechanism 400, causing the auxiliary mechanism 400 to move elastically and resist the sealing mechanism 300. This ensures that the sealing elements of the sealing mechanism 300 and the auxiliary mechanism 400 fit tightly together, thereby forming a double sealing structure and increasing the reliability of the seal.

[0041] In addition, during the movement of the auxiliary mechanism 400, it engages with the sealing mechanism 300. This engagement method ensures the stability of the support mechanism 200, the sealing mechanism 300 and the auxiliary mechanism 400 during subsequent concrete pouring. It can effectively prevent the device from becoming less effective or unstable due to displacement of components.

[0042] Considering the need to strengthen the load-bearing capacity of the pipe body 100 against the concrete, such as Figure 3As shown, the specific structure of the support mechanism 200 is further disclosed. The support mechanism 200 includes a fixed plate 210 fixedly connected to the inner wall of the tube body 100. A connecting rod 211 is fixedly connected to the center of the fixed plate 210. A sliding rod 212 is slidably connected to the outer wall of the connecting rod 211. Multiple through slots are provided on the fixed plate 210, and support plates 213 are slidably connected in each through slot. A rotating rod 214 is rotatably connected to the outer wall of the sliding rod 212, and the support plate 213 is rotatably connected to the adjacent rotating rod 214. Manually pushing the handle installed on the movable plate 310 moves the movable plate 310. The movement of the sliding rod 212 causes the sliding rod 212 to slide on the connecting rod 211. The movement of the sliding rod 212 causes the rotating rod 214 to move. Under the limitation of the length of the rotating rod 214 and the range of motion of the support plate 213, the rotating rod 214 expands and rotates, thereby causing the support plate 213 to expand and support the inner wall of the pipe 100. When concrete is subsequently injected into the pipe 100, the concrete will exert lateral pressure on the pipe 100. Supporting the inner wall of the pipe 100 can effectively resist this lateral pressure, thereby improving the overall load-bearing capacity of the pipe 100.

[0043] Considering the need to seal the port of pipe body 100, such as Figures 6-7 As shown, the specific structure of the sealing mechanism 300 is further disclosed. The sealing mechanism 300 includes a movable plate 310 fixedly connected to the outer wall of the slide rod 212. A first sealing ring 311 is fixedly connected to the side of the movable plate 310 near the support plate 213. When the movable plate 310 is manually pushed to move, the movable plate 310 drives the first sealing ring 311 to move. In conjunction with the slide rod 212, the support plate 213 and the rotating rod 214, the movable plate 310 and the first sealing ring 311 on the other side can be moved to seal both sides of the pipe body 100, so as to prevent concrete from flowing into the inside of the pipe body 100 from the port when pouring concrete, thus ensuring the cleanliness of the channel.

[0044] To enhance the sealing effect at the 100 port of the pipe body, such as Figure 4 As shown, the specific structure of the auxiliary mechanism 400 is further disclosed. The auxiliary mechanism 400 includes at least a movable ring 410 that is slidably connected to the inner wall of the tube body 100. A second sealing ring 411 is fixedly connected to the side of the movable ring 410 near the first sealing ring 311. When the movable ring 410 is squeezed, it moves, which can drive the second sealing ring 411 to move, so that the second sealing ring 411 and the first sealing ring 311 are tightly fitted together, forming a double sealing structure, thereby increasing the reliability of the seal.

[0045] To prevent accidental movement between the moving plate 310 and the moving ring 410 when pouring concrete around the pipe body 100, such as Figures 7-8As shown, a hollow column 420 is fixedly connected to the side of the moving ring 410 near the moving plate 310. A locking block 421 is slidably connected to one side of the hollow column 420. A locking groove is provided on the side of the moving plate 310 near the hollow column 420, and the size of the locking groove is adapted to the size of the locking block 421. When the moving ring 410 moves, it drives the hollow column 420 to move, thereby driving the locking block 421 to move. Before the locking block 421 moves to the locking groove of the moving plate 310, it is squeezed, causing the locking block 421 to move into the hollow column 420. After the locking block 421 moves to the locking groove of the moving plate 310, the locking block 421 can be engaged in the locking groove of the moving plate 310 through elastic movement. This can effectively connect the moving plate 310 and the moving ring 410 together, restrict their relative displacement at the port of the tube body 100, and further ensure the stability of the sealing effect.

[0046] After the card block 421 is squeezed and moves into the hollow column 420, considering that the card block 421 needs to be reset and repositioned into the slot of the moving plate 310, such as Figures 5-9 As shown, a positioning rod 423 is fixedly connected to the inner wall of the hollow column 420. An installation block 424 is slidably connected inside the positioning rod 423. A groove is inclinedly opened on the side of the locking block 421 near the installation block 424. A support column 422 is slidably connected in the groove. The side of the support column 422 away from the groove is fixedly connected to the side of the installation block 424. A first return spring 425 is fixedly connected to one side of the installation block 424. The side of the first return spring 425 away from the installation block 424 is fixedly connected to the positioning rod 423.

[0047] When the locking block 421 is squeezed, the locking block 421 moves into the hollow column 420. Under the restriction of the groove opened at the inclination of the locking block 421, the locking block 421 moves downward, causing the support column 422 to slide in the groove, thereby causing the mounting block 424 to slide towards the side closer to the moving ring 410. At this time, the first reset spring 425 is stretched and deformed.

[0048] like Figure 9 As shown, when the locking block 421 moves to the slot, the locking block 421 is not squeezed. Under the force of the first return spring 425 restoring its deformation, it drives the mounting block 424, the support column 422 and the locking block 421 to reset and move, so that the locking block 421 is locked into the slot of the moving plate 310.

[0049] When the support plate 213 does not need to support the interior of the tube 100, the movable plate 310 can only be pulled after the locking block 421 is retracted into the hollow column 420. Figure 5As shown, a pressing rod 320 is slidably connected to one side of the moving plate 310, and the pressing rod 320 is parallel and aligned with the mounting block 424. First, the pressing rod 320 is pushed so that it abuts against the positioning rod 423, causing the positioning rod 423 to move towards the moving ring 410. The movement of the positioning rod 423, in conjunction with the support column 422, causes the locking block 421 to move into the hollow column 420, so that the locking block 421 and the moving plate 310 are not locked together. Subsequently, while abutting against the pressing rod 320, the moving plate 310 is manually pulled, causing the moving plate 310 to move outward. In conjunction with the sealing mechanism 300 and the support mechanism 200, the support plate 213 does not support the inner wall of the pipe body 100.

[0050] In order to move the moving ring 410, such as Figure 6 As shown, a limiting block 430 is fixedly connected to the side of the moving ring 410 near the support plate 213. A protrusion 431 is fixedly connected to the side of the support plate 213 near the limiting block 430, and the protrusion 431 is parallel and aligned with the limiting block 430. A second return spring 432 is fixedly connected to the side of the moving ring 410 near the limiting block 430, and the side of the second return spring 432 away from the moving ring 410 is fixedly connected to the inner wall of the tube body 100. When the rotating rod 214 expands and moves, it drives the protrusion 431 to press the limiting block 430. When the moving ring 410 moves, the second return spring 432 is deformed by force. When the protrusion 431 does not press the limiting block 430, the moving ring 410 can be driven to return to its original position under the force of the second return spring 432 restoring its deformation.

[0051] Working principle: First, place the pipe body 100 on the positioning rib. Then, manually push the handle installed on the moving plate 310 to move the moving plate 310, thereby causing the sliding rod 212 to slide on the connecting rod 211. The movement of the sliding rod 212 causes the rotating rod 214 to move. Under the limitation of the length of the rotating rod 214 and the range of motion of the support plate 213, the rotating rod 214 expands and rotates, thereby causing the support plate 213 to expand and support the inner wall of the pipe body 100. When concrete is subsequently injected into the pipe body 100, the concrete will generate lateral pressure on the pipe body 100. Supporting the inner wall of the pipe body 100 can effectively resist this lateral pressure and improve the overall load-bearing capacity of the pipe body 100.

[0052] When the rotating rod 214 supports the inner wall of the pipe body 100, the moving plate 310 moves and drives the first sealing ring 311 to move into the inside of the pipe body 100, which can seal the port of the pipe body 100 and prevent the water from flowing into the inside of the pipe body 100 during subsequent pouring. When the rotating rod 214 expands and moves, it drives the protrusion 431 to move. The protrusion 431 moves and squeezes the limiting block 430, causing the limiting block 430 to move, thereby driving the moving ring 410 to move, and then driving the second sealing ring 411 to move, so that the second sealing ring 411 and the first sealing ring 311 fit tightly together, forming a double sealing structure. The second sealing ring 411 and the first sealing ring 311 cooperate with each other, increasing the reliability of the seal.

[0053] As the moving ring 410 moves, it drives the hollow column 420 to move, which in turn drives the locking block 421 to move. Before the locking block 421 moves to the slot of the moving plate 310, it is squeezed, causing the locking block 421 to move into the hollow column 420. Under the restriction of the groove opened at the inclination of the locking block 421, the locking block 421 moves downward, driving the support column 422 to slide in the groove, thereby driving the mounting block 424 to slide closer to the moving ring 410. At this time, the first return spring 425 is stretched and deformed. Subsequently, after the locking block 421 moves to the slot of the moving plate 310, under the force of the first return spring 425 restoring its deformation, it drives the mounting block 424, the support column 422 and the locking block 421 to reset and move, so that the locking block 421 is engaged in the slot of the moving plate 310, which can effectively connect the moving plate 310 and the moving ring 410 together, restricting their relative displacement at the port of the tube body 100, and further ensuring the stability of the sealing effect.

[0054] The second objective of this invention is to provide a process for hollowing out prestressed concrete duct tie rods, applicable to any of the above-mentioned hollowing-out devices for prestressed concrete duct tie rods, comprising the following steps:

[0055] Step 1: Place the pipe body 100 on the positioning steel bar, manually push the support mechanism 200 to expand and support the inner wall of the pipe body 100, and at the same time, the sealing mechanism 300 can seal both sides of the pipe body 100.

[0056] Step 2: When the support mechanism 200 moves, it squeezes the auxiliary mechanism 400, causing the auxiliary mechanism 400 to move elastically and fit tightly with the sealing mechanism 300. At the same time, the auxiliary mechanism 400 and the sealing mechanism 300 are engaged. Then, the pipe body 100 is fixed by steel wire. Finally, concrete is injected around the pipe body 100.

[0057] Step 3: After the concrete has initially set, remove the pipe body 100 from the concrete.

[0058] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A through-type prestressed concrete duct tie rod forming device, comprising a tube body (100), characterized in that: The tube body (100) is provided with a support mechanism (200) for supporting the inner wall of the tube body (100), and the tube body (100) is also provided with a sealing mechanism (300) and an auxiliary mechanism (400). When the support mechanism (200) supports the inner wall of the pipe body (100), it drives the sealing mechanism (300) to seal both sides of the pipe body (100). At the same time, the support mechanism (200) drives the auxiliary mechanism (400) to move elastically and abut against the sealing mechanism (300), and the auxiliary mechanism (400) and the sealing mechanism (300) are engaged. The support mechanism (200) includes a fixed plate (210) fixedly connected to the inner wall of the tube body (100), a connecting rod (211) fixedly connected to the center of the fixed plate (210), a sliding rod (212) slidably connected to the outer wall of the connecting rod (211), a plurality of through slots are provided on the fixed plate (210), a support plate (213) is slidably connected to each through slot, a rotating rod (214) is rotatably connected to the outer wall of the sliding rod (212), and the support plate (213) is rotatably connected to the adjacent rotating rod (214); The sealing mechanism (300) includes a movable plate (310) fixedly connected to the outer wall of the slide bar (212), and a sealing ring (311) is fixedly connected to the side of the movable plate (310) near the support plate (213). The auxiliary mechanism (400) includes at least a movable ring (410) that is slidably connected to the inner wall of the tube body (100), and a second sealing ring (411) is fixedly connected to the side of the movable ring (410) near the first sealing ring (311). A hollow column (420) is fixedly connected to the side of the movable ring (410) near the movable plate (310), and a locking block (421) is slidably connected to one side of the hollow column (420). A locking groove is provided on the side of the movable plate (310) near the hollow column (420), and the size of the locking groove is adapted to the size of the locking block (421). A positioning rod (423) is fixedly connected to the inner wall of the hollow column (420). An installation block (424) is slidably connected inside the positioning rod (423). A groove is inclinedly opened on the side of the locking block (421) near the installation block (424). A support column (422) is slidably connected in the groove. The side of the support column (422) away from the groove is fixedly connected to the side of the installation block (424). A first return spring (425) is fixedly connected to one side of the installation block (424). The side of the first return spring (425) away from the installation block (424) is fixedly connected to the positioning rod (423). A pressing rod (320) is slidably connected to one side of the movable plate (310), and the pressing rod (320) is parallel and aligned with the mounting block (424); The movable ring (410) is fixedly connected to a limiting block (430) on the side near the support plate (213). A protrusion (431) is fixedly connected to the side of the support plate (213) near the limiting block (430), and the protrusion (431) is parallel and aligned with the limiting block (430). A second return spring (432) is fixedly connected to the side of the movable ring (410) near the limiting block (430), and the side of the second return spring (432) away from the movable ring (410) is fixedly connected to the inner wall of the tube body (100). When the rotating rod (214) expands and moves, it drives the protrusion (431) to press the limiting block (430), and drives the moving ring (410) to move. At this time, the second reset spring (432) is subjected to force and deforms. When the protrusion (431) does not press the limiting block (430), the moving ring (410) can be driven to reset and move under the force of the second reset spring (432) restoring its deformation.

2. A process for hollowing out prestressed concrete duct tie rods based on the hollowing-out device for hollowing out prestressed concrete ducts as described in claim 1, characterized in that, Includes the following steps: Step 1: Place the pipe body (100) on the positioning steel bar, manually push the support mechanism (200) to expand the support mechanism (200) to support the inner wall of the pipe body (100), and at the same time the sealing mechanism (300) can seal both sides of the pipe body (100); Step 2: When the support mechanism (200) moves, it squeezes the auxiliary mechanism (400), causing the auxiliary mechanism (400) to move elastically and fit tightly with the sealing mechanism (300). At the same time, the auxiliary mechanism (400) and the sealing mechanism (300) are engaged. Then, the pipe body (100) is fixed by steel wire. Finally, concrete is injected around the pipe body (100). Step 3: After the concrete has initially set, the pipe (100) is pulled out of the concrete.

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