A method of concrete placement in a confined space

Abstract

This application relates to the technical field of arch bridge repair construction, and in particular to a method for concrete pouring in a confined space, comprising the following steps: S1, construction preparation; S1.1, transporting the pouring equipment to the pouring location; S1.2, providing formwork support; S1.3, opening pouring holes in the formwork and installing pouring pipes; S1.4, opening an overflow hole at the highest point of the pouring location; S2, pouring; S2.1, connecting the pouring equipment and the pouring pipes, and using the pouring equipment to deliver concrete into the pouring pipes; S2.2, observing whether grout is flowing from the overflow hole. If grout is flowing, observe whether the hole is full. If the hole is full, stop pouring and seal the overflow hole. This application, through the design of the overflow hole, makes it more intuitive to fill the gap between the arch corrugated steel plate and the arch web with concrete, reduces voids between the arch corrugated steel plate and the arch web, and enhances the reinforcement of the arch bridge by the arch corrugated steel plate.

Description

Technical Field

[0001] This application relates to the technical field of arch bridge repair construction, and in particular to a method for concrete pouring in a confined space. Background Technology

[0002] Currently, stone arch bridges remain the dominant bridge type for highways, playing a vital role in highway transportation. The condition of the bridge directly affects the traffic flow, therefore, it is essential to employ reasonable and effective techniques for the maintenance and reinforcement of dangerous bridges. When reinforcing arch bridges, corrugated steel plates are typically added to the arch's web. Due to the thermal expansion and contraction of concrete, a certain gap must be maintained between the corrugated steel plate and the arch web to ensure uniform stress distribution later on. Concrete is then poured between the arch web and the steel plate.

[0003] In the process of realizing this application, the inventors discovered that the technology has at least the following problems: the corrugated steel plate is relatively close to the original arch bridge, and the steel plate is arched, making concrete pouring difficult, and voids are likely to exist in the gap between the steel plate and the arch after pouring. Summary of the Invention

[0004] To reduce the void between the steel plate and the arch, this application provides a method for concrete pouring in a confined space.

[0005] This application provides a method for concrete pouring in a confined space, which adopts the following technical solution:

[0006] A method for pouring concrete in a confined space includes the following steps:

[0007] S1. Construction preparation; S1.1. Transport the pouring equipment to the pouring location; S1.2. Install formwork support; S1.3. Open pouring holes in the formwork and install pouring pipes; S1.4. Open overflow holes at the highest point of the pouring location.

[0008] S2. Pouring; S2.1. Connect the pouring equipment and the pouring pipe, and use the pouring equipment to deliver concrete into the pouring pipe; S2.2. Observe whether grout is coming out of the overflow hole. If grout is coming out, observe whether the hole is full. If the hole is full, stop pouring and seal the overflow hole.

[0009] By adopting the above technical solution, the pouring equipment is first transported to the pouring location. Then, formwork support is installed between the arched corrugated steel plate and the arch web. Epoxy sealing can be used for the formwork support. Pouring holes are opened on the formwork, and overflow holes are opened at the highest point of the arched corrugated steel plate. The pouring equipment and pouring pipes are then connected to the pouring holes. Concrete is poured into the pouring holes using the pouring equipment, while observing whether concrete flows out of the overflow holes. When concrete flows out, it indicates that the concrete has filled the gap between the arched corrugated steel plate and the arch web. The pouring equipment is then stopped, and the overflow holes are sealed. The concrete is then allowed to solidify naturally. The overflow holes make it more intuitive to see if the concrete fills the gap between the arched corrugated steel plate and the arch web, reducing voids between them and enhancing the reinforcement of the arch bridge. This also reduces the uneven thermal expansion of the concrete caused by voids between them, which would reduce the reinforcement effect.

[0010] Optionally, in step S1, multiple overflow holes are opened at the highest point of the pouring position, and the multiple overflow holes are equally spaced along the direction away from the pouring hole; the multiple overflow holes can be observed sequentially in the direction away from the pouring hole, and the overflow holes are sealed when the overflow holes are full of overflow.

[0011] By adopting the above technical solution, during the concrete pouring process, the concrete will gradually fill the gap between the arched corrugated steel plate and the arch web. Multiple overflow holes make it easy to observe where there is a chance of incomplete concrete filling. The multiple overflow holes make the concrete pouring more intuitive. At the same time, the overflow holes facilitate air venting, further reducing the chance of voids in the concrete and improving the reinforcement effect.

[0012] Optionally, in step S1, multiple pouring holes can be provided, and the pouring holes can be symmetrically provided along the length of the pouring space; at the same time, multiple pouring holes can be provided along the circumference of the template according to the pouring height, and pouring can be carried out in layers to reduce the segregation of concrete and make the concrete pouring more compact.

[0013] By adopting the above technical solution, during the concrete pouring process, the concrete can be poured in layers according to the pouring height. Layered pouring can reduce the drop of the concrete, reduce the probability of concrete segregation, and maintain the solidity of the concrete. At the same time, multiple pouring holes can be opened to pour symmetrically at the same time, which can improve the pouring speed. In addition, layered pouring further reduces the probability of voids in the concrete, making the concrete between the arched corrugated steel plate and the arch web more solid, thus improving the reinforcement effect.

[0014] Optionally, the pouring equipment includes a ground pump, connecting pipes, and a switch valve. The switch valve is connected to the discharge end of the ground pump via the connecting pipes and is located on the pouring pipe above the pouring hole. The connecting pipes include a first connecting pipe, a second connecting pipe, and a third connecting pipe. The first connecting pipe is located at the discharge end of the ground pump. The second connecting pipe is connected to the first connecting pipe away from the ground pump and is a flexible hose. The third connecting pipe is located on the second connecting pipe and has a connecting mechanism for connecting to the switch valve.

[0015] By adopting the above technical solution, when pouring concrete, the ground pump is first placed on the arch bridge, and then multiple first connecting pipes are connected in sequence. Then, the first connecting pipes are connected to the second connecting pipes, and then the second connecting pipes and the third connecting pipes are connected. Then, the third connecting pipe is connected to the switch valve through the connecting mechanism. Then, the ground pump is started, and the ground pump delivers concrete through the first connecting pipes, the second connecting pipes, the third connecting pipes, and the switch valve into the cavity between the arch corrugated steel plate and the arch belly. When the concrete fills the entire cavity, the switch valve is closed to reduce the outflow of concrete and ensure that the concrete at the pouring hole is dense.

[0016] Optionally, the connection mechanism includes a docking plug, a fourth connecting pipe, a sealing ring, a limiting ring, and a limiting component. The docking plug is disposed on the third connecting pipe, and the diameter of the docking plug gradually decreases at the end away from the third connecting pipe. The fourth connecting pipe is disposed on the switch valve, the docking plug is inserted into the fourth connecting pipe, the sealing ring is disposed in the fourth connecting pipe and abuts against the outer wall of the docking plug, the limiting ring is disposed on the third connecting pipe, and the limiting component is disposed on the fourth connecting pipe and connected to the limiting ring.

[0017] By adopting the above technical solution, after connecting the ground pump, the first connecting pipe, the second connecting pipe and the third connecting pipe, the docking plug on the third connecting pipe is first inserted into the fourth connecting pipe. The third connecting pipe abuts against the sealing ring, and then the limiting component is used to connect the limiting ring. The connection mechanism is simple in structure and easy to operate. At the same time, the sealing ring can reduce the flow of concrete from the connection between the two pipes, reduce concrete waste, and reduce site pollution.

[0018] Optionally, the limiting component includes a support block, a rotating bar, a limiting block, and a torsion spring. Multiple support blocks are provided on the fourth connecting pipe. The rotating bar is rotatably mounted on the support blocks. The torsion spring is mounted on the support blocks and connected to the rotating bar, causing the rotating bar to rotate parallel to the fourth connecting pipe. The limiting block is located at one end of the rotating bar. The side wall of the limiting block near the support block abuts against the side wall of the limiting ring away from the fourth connecting pipe. A guide surface is provided on the side wall of the limiting block away from the support block to facilitate the sliding of the limiting ring between the limiting block and the support block.

[0019] By adopting the above technical solution, the sliding third connecting pipe moves closer to the fourth connecting pipe, the limiting ring abuts against the guide surface on the limiting block, and drives the limiting block and the rotating bar to rotate. The torsion spring is twisted by force. When the limiting ring slides and passes the limiting block, the torsion spring drives the limiting block to return to its initial position. The limiting ring abuts against the side wall of the limiting block away from the support block and restricts the limiting ring from moving away from the fourth connecting pipe. The limiting component has a simple structure, and one person can switch and install the pipeline, reducing the waste of manpower and thus reducing labor costs. At the same time, the limiting component can reduce the excessive waste of human strength and reduce the labor intensity of workers.

[0020] Optionally, the support block is slidably disposed on the fourth connecting pipe along the length direction of the fourth connecting pipe. The fourth connecting pipe is provided with a sealing correction mechanism, which includes a fixing plate and a wedge plate. The fixing plate is disposed on the fourth connecting pipe. The fixing plate is located on one side of the support block and has a sliding hole. The wedge plate is slidably disposed in the sliding hole. One end of the wedge plate is located between the support block and the limiting block. The wedge plate abuts against the support block and drives the support block away from the third connecting pipe.

[0021] By adopting the above technical solution, after the limiting block is pressed against the limiting ring, the construction worker uses a hammer to strike the wedge plate. The wedge plate drives the guide block to slide along the sliding hole. The wedge plate drives the support block away from the third connecting pipe. The limiting block on the support block drives the limiting ring to move closer to the fourth connecting pipe, so that the docking plug is pressed against the sealing ring, further reducing the chance of grout leakage. The sealing correction mechanism has a simple structure and can be operated by one person, making the switching of the grouting position more convenient and quick. At the same time, the sealing correction mechanism makes the docking plug press against the sealing ring, which can further reduce environmental pollution, reduce site cleaning time, and improve work efficiency.

[0022] Optionally, the docking plug is provided with a calibration groove, and the sealing calibration mechanism further includes a calibration component, which includes a drive rod and a calibration ring. Multiple drive rods are slidably connected to the fourth connecting pipe. The drive rods pass through the inner wall of the fourth connecting pipe and extend into the fourth connecting pipe. The calibration ring is provided at one end of the drive rod located inside the fourth connecting pipe. The calibration ring is inserted into the calibration groove, making the docking plug coaxial with the fourth connecting pipe. The end of the drive rod away from the calibration ring has an inclined surface and abuts against the support block. When the support block moves away from the limiting ring, it drives the drive rod to move closer to the docking plug.

[0023] By adopting the above technical solution, construction workers use a hammer to strike the wedge plate, which causes the support block to slide. The support block then causes the limiting block to pull the limiting ring to slide, making the connector press against the sealing ring. At the same time, the support block causes the drive rod to slide, which in turn causes the correction ring to slide. The correction ring causes the connector to be concentric with the fourth connecting pipe, thereby reducing damage to the sealing ring caused by misalignment of the connector and reducing grout leakage caused by misalignment of the connector.

[0024] Optionally, the fourth connecting pipe is provided with a hook and a limiting rod. The hook is rotatably mounted on the fourth connecting pipe, and the limiting rod is mounted on the rotating bar. The hook is connected to the limiting rod.

[0025] By adopting the above technical solution, when changing the grouting position, the wedge plate can be knocked out with a hammer, and then the limiting block can be rotated to separate from the limiting ring. The limiting block drives the rotating bar to rotate, and then the hook is connected to the limiting rod, so that the limiting block always remains separated from the limiting ring. Then the docking plug is pulled out and plugged into another fourth connecting pipe. The hook and limiting rod make it more convenient and faster to change the pouring position, thereby reducing the loss of concrete in the third connecting pipe and reducing concrete waste.

[0026] Optionally, the pouring equipment further includes an adjustment mechanism, which includes a support frame, a drive assembly, and an electric hoist. The support frame is disposed on one side of the template, the electric hoist is slidably disposed on the support frame, the drive assembly is disposed on the support frame and drives the electric hoist to slide, and the hook of the electric hoist is connected to the third connecting pipe.

[0027] By adopting the above technical solution, when changing the pouring position, the third connecting pipe and the fourth connecting pipe are first separated. Then, an electric hoist is used to lift the third connecting pipe. The drive assembly is then used to move the third connecting pipe to the next pouring position. The electric hoist is then used to move the third connecting pipe closer to the next fourth connecting pipe, and then the third connecting pipe and the fourth connecting pipe are connected. The adjustment mechanism makes the change of pouring position more convenient, further improves work efficiency, and reduces labor intensity. On the other hand, the adjustment mechanism can be used for the movement and installation of the arched corrugated steel plate. One structure has multiple uses, making full use of resources.

[0028] In summary, this application includes the following beneficial technical effects:

[0029] 1. By setting up overflow holes, it becomes more intuitive to fill the gap between the arch corrugated steel plate and the arch web with concrete. This reduces the voids between the arch corrugated steel plate and the arch web, strengthens the arch bridge with the arch corrugated steel plate, and reduces the uneven expansion of concrete due to heat caused by voids between the two, which would reduce the reinforcement effect.

[0030] 2. The limit component has a simple structure, and one person can switch and install pipelines, reducing labor waste and thus lowering labor costs. At the same time, the limit component can reduce excessive waste of human strength and reduce the labor intensity of workers.

[0031] 3. The sealing and correction mechanism has a simple structure and can be operated by one person, making the switching of the injection position more convenient and quick. At the same time, the sealing and correction mechanism ensures that the docking plug is tightly pressed against the sealing ring, which can further reduce environmental pollution, reduce site cleaning time, and improve work efficiency.

[0032] 4. When changing the pouring position, first separate the third connecting pipe from the fourth connecting pipe, then use an electric hoist to lift the third connecting pipe, then use the drive assembly to move the third connecting pipe to the next pouring position, then use the electric hoist to move the third connecting pipe closer to the next fourth connecting pipe, and then connect the third connecting pipe and the fourth connecting pipe. The set adjustment mechanism makes the change of pouring position more convenient, further improves work efficiency, and reduces labor intensity. On the other hand, the set adjustment mechanism can be used for the movement and installation of arched corrugated steel plates. One structure has multiple uses, making the best use of resources. Attached Figure Description

[0033] Figure 1 This is a flowchart illustrating the concrete pouring method in a confined space as described in this application embodiment.

[0034] Figure 2 This is a schematic diagram of the overall pouring equipment in the embodiments of this application;

[0035] Figure 3 This is a schematic diagram of the connecting pipeline structure in an embodiment of this application;

[0036] Figure 4 This is a schematic diagram of the connecting mechanism in the embodiments of this application;

[0037] Figure 5 This is a schematic diagram of the structure of the correction component in an embodiment of this application;

[0038] Figure 6 This is a schematic diagram of the sealing correction mechanism in the embodiments of this application.

[0039] Reference numerals: 100, ground pump; 200, connecting pipe; 210, first connecting pipe; 220, second connecting pipe; 230, third connecting pipe; 240, shut-off valve; 300, switch valve; 400, connecting mechanism; 410, docking plug; 420, fourth connecting pipe; 430, sealing ring; 440, limiting ring; 450, limiting assembly; 451, support block; 452, rotating bar; 453, limiting block; 454, torsion spring; 455. Support ring; 500. Sealing correction mechanism; 510. Fixing plate; 520. Wedge plate; 530. Guide block; 540. Correction assembly; 541. Drive rod; 542. Correction ring; 550. Locking assembly; 551. Hook; 552. Limit rod; 600. Adjustment mechanism; 610. Support frame; 620. Slide rail; 630. Drive assembly; 640. Electric hoist; 700. Template; 800. Arched corrugated steel plate. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0041] This application discloses a method for concrete pouring in a confined space.

[0042] refer to Figure 1 and Figure 2 A method for pouring concrete in a confined space, comprising the following steps:

[0043] S1. Construction Preparation; S1.1. Transport the pouring equipment to the pouring location and secure it firmly; S1.2. Install formwork 700 support. Install formwork 700 at both ends between the arched corrugated steel plate 800 and the arch web. Formwork 700 can be sealed with epoxy grouting or welded to the arched corrugated steel plate 800; S1.3. Based on the height of the arch bridge, open multiple pouring holes along the circumference of formwork 700, and also open multiple pouring holes on the formwork 700 at both ends. Install a short pouring pipe section on each pouring hole; S1.4. At the highest point of the pouring location, that is, the uppermost point of the arched corrugated steel plate 800... Multiple overflow holes are opened at high points, with multiple overflow holes opened along the length of the 800mm arched corrugated steel plate, and multiple overflow holes are set at equal intervals along the length away from the pouring hole; S2, pouring, S2.1, connect the pouring equipment and pouring pipe, and use the pouring equipment to transport concrete into the pouring pipe; S2.2, observe whether grout is coming out of the overflow holes. When grout is coming out, observe whether grout is coming out of the overflow holes in sequence in the direction away from the pouring hole. When the overflow hole is full of grout, seal the overflow holes in sequence, and ensure that the blockage does not exceed the 800mm arched corrugated steel plate; at the same time, during the layered pouring process, seal the lower pouring pipes in sequence to reduce grout leakage when the concrete fills the entire cavity.

[0044] refer to Figure 2 and Figure 3 The pouring equipment includes a ground pump 100 placed on or on one side of the arch bridge. The location is preferably chosen to facilitate the supply of concrete to the ground pump 100. Each pouring hole has a pouring pipe fixedly connected to a switch valve 300. A connecting pipe 200 connects the switch valve 300 and the ground pump 100. The connecting pipe 200 includes a first connecting pipe 210 fixedly connected to the discharge end of the ground pump 100. A second connecting pipe 220 is fixedly connected to the end of the first connecting pipe 210 away from the ground pump 100. The second connecting pipe 220 is a flexible hose. A third connecting pipe 230 is connected to the end of the second connecting pipe 220 away from the first connecting pipe 210 through a flange. The third connecting pipe 230 is a short steel pipe. A shut-off valve 240 is fixedly connected to the end of the third connecting pipe 230 away from the second connecting pipe 220.

[0045] refer to Figure 3 and Figure 4A connecting mechanism 400 is provided at the end of the third connecting pipe 230 away from the second connecting pipe 220. The connecting mechanism 400 includes a docking plug 410 fixedly connected to the end of the third connecting pipe 230 away from the second connecting pipe 220. The docking plug 410 is hollow and frustum-shaped, and the diameter of the docking plug 410 gradually decreases at the end away from the third connecting pipe 230. A fourth connecting pipe 420 is fixedly connected to the switch valve. The docking plug 410 is inserted into the fourth connecting pipe 420. A sealing ring 430 is fixedly connected to the inner wall of the fourth connecting pipe 420. The sealing ring 430 is a VD type sealing ring 430, and the outer wall of the docking plug 410 abuts against the inner wall of the sealing ring 430. A limiting ring 440 is fixedly connected to the end of the third connecting pipe 230 near the fourth connecting pipe 420. A limiting component 450 connected to the limiting ring 440 is provided on the fourth connecting pipe 420.

[0046] refer to Figure 4 and Figure 5 The limiting component 450 includes a support ring 455 sleeved on the fourth connecting pipe 420. The support ring 455 can slide along the length direction of the fourth connecting pipe 420. Multiple support blocks 451 are integrally provided on the support ring 455. In this embodiment, two support blocks 451 are preferably arranged symmetrically, and their axes coincide. A rotating bar 452 is rotatably connected to the end of the support block 451 away from the support ring 455. A torsion spring 454 connected to the rotating bar 452 is fixedly connected to the support block 451. The torsion spring 454 carries... The rotating bar 452 is always parallel to the fourth connecting pipe 420; one end of the rotating bar 452 extends to the limiting ring 440, and the end of the rotating bar 452 is vertically fixedly connected to the limiting block 453. The side wall of the limiting block 453 near the support block 451 abuts against the side wall of the limiting ring 440 away from the fourth connecting pipe 420, and the side wall of the limiting block 453 away from the limiting ring 440 is provided with an inclined guide surface, and the end of the guide surface near the third connecting pipe 230 is inclined towards the support block 451.

[0047] refer to Figure 5 and Figure 6 A sealing correction mechanism 500 is provided on the fourth connecting pipe 420. The sealing correction mechanism 500 includes a fixing plate 510 fixedly connected to the fourth connecting pipe 420. The fixing plate 510 is located on the side of the support ring 455 near the third connecting pipe 230. A sliding hole is opened on the side wall of the fixing plate 510 away from the support block 451. A wedge plate 520 is slidably connected in the sliding hole. The wedge-shaped surface of the wedge plate 520 abuts against the support block 451 and drives the support block 451 away from the third connecting pipe 230. A sliding hole is opened on the side wall of the wedge plate 520 that abuts against the support ring 455. A guide block 530 is slidably connected in the sliding hole. The guide block 530 is fixedly connected to the support ring 455 and restricts the sliding path of the wedge plate 520, reducing the force deviation of the wedge plate 520.

[0048] refer to Figure 5 and Figure 6 A correction assembly 540 is provided on the fourth connecting pipe 420. The correction assembly 540 includes two drive rods 541 slidably connected to the side wall of the fourth connecting pipe 420. The two drive rods 541 are on the same axis and parallel to the axis of the support block 451. The drive rods 541 abut against the side wall of the support ring 455 away from the limiting ring 440. An inclined surface is provided on the side wall where the drive rods 541 abut against the support ring 455. The end of the drive rod 541 near the support ring 455 is inclined away from the support ring 455, and the drive rod 541 slides towards the axis of the fourth connecting pipe 420 as the support ring 455 slides. A correction ring 542 is fixedly connected to the side wall of the drive rod 541 away from the support ring 455. The correction rings 542 of the two drive rods 541 are symmetrically arranged and are both semi-circular cylindrical rings. A calibration groove is provided on the head 410. The calibration groove is located on the side of the sealing ring 430 near the third connecting pipe 230, and the calibration ring 542 is engaged in the calibration groove. When the wedge plate 520 is struck, the support block 451 slides towards the switch valve 300. The support block 451 drives the limit ring 440, which abuts against the limit block 453, to slide, and drives the docking plug 410 to move closer to the switch valve 300. At the same time, the support ring 455 abuts against the inclined surface of the drive rod 541, and drives the calibration ring 542 on the drive rod 541 to move closer to the docking plug 410, so that the calibration ring 542 is inserted into the calibration groove. On the one hand, this makes the docking plug 410 concentric with the fourth connecting pipe 420. On the other hand, it makes the docking plug 410 tend to continue to move closer to the switch valve 300, so that the docking plug 410 abuts against the sealing ring 430.

[0049] refer to Figure 5 and Figure 6 A locking assembly 550 is provided on the fourth connecting pipe 420. The locking assembly 550 includes two hooks 551 rotatably connected to the fourth connecting pipe 420. The hooks of the hooks 551 face the rotating bar 452 on the support block 451. The end of the rotating bar 452 away from the limiting block 453 is fixedly connected to the limiting rod 552. The limiting rod 552 is located on the side of the rotating bar 452 away from the limiting block 453. When the rotating bar 452 is pressed, the rotating bar 452 drives the limiting rod 552 to move closer to the fourth connecting pipe 420. Then, the hooks 551 are rotated to pass around the limiting rod 552 and make the hooks of the hooks 551 located on the side of the limiting rod 552 close to the limiting block 453. When the rotating bar 452 is released, the torsion spring 454 drives the rotating bar 452 to rotate. The hooks of the hooks 551 abut against the limiting rod 552 and restrict the rotation of the rotating bar 452.

[0050] refer to Figure 2An adjustment mechanism 600 is provided on the arch bridge. The adjustment mechanism 600 includes a support frame 610 placed on the arch bridge. A slide rail 620 is provided along the length direction of the support frame 610. The slide rail 620 is arranged along the length direction of the arch bridge, and an electric hoist 640 is slidably connected to the slide rail 620. A drive assembly 630 is provided on the electric hoist 640. The drive assembly 630 includes a sliding frame fixedly connected to the electric hoist 640 and a sliding roller rotatably arranged on the sliding frame. The sliding roller is rotatably connected to the slide rail 620. A drive motor is provided on the sliding frame. The drive motor is connected to the sliding roller and drives the sliding roller to rotate. When the drive motor is started, the drive motor drives the sliding roller to rotate, and the sliding roller drives the sliding frame to slide along the slide rail 620. A steel wire rope is sleeved on the lifting hook of the electric hoist 640. The steel wire rope is connected to the third connecting pipe 230 and drives the third connecting pipe 230 to rise and fall with the movement of the electric hoist 640.

[0051] The implementation principle of a concrete pouring method in a confined space according to an embodiment of this application is as follows: During pouring, firstly, a template 700 is used to seal both ends of the arched corrugated steel plate 800 and the arch web. Then, multiple pouring holes are opened along the circumference of the template 700, and pouring pipes are installed at the pouring holes of the template 700. Each pouring pipe is equipped with a switch valve 300. Then, the ground pump 100 is transported to the arch bridge or one side of the arch bridge. Then, the first connecting pipe 210, the second connecting pipe 220, and the third connecting pipe 230 are connected in sequence. Then, the docking plug 410 on the third connecting pipe 230 is brought closer to the fourth connecting pipe 420 on both sides of the bridge center. When the docking plug 410 is inserted into the fourth connecting pipe 420, the limiting ring 440 and the limiting block 453 are brought into contact with the guide surface, and the limiting block 453 and the rotating bar 452 are rotated. At the same time, the torsion spring 454 is twisted and accumulates force. The elastic force is accumulated until the limiting ring 440 passes the limiting block 453. The torsion spring 454 drives the rotating bar 452 and the limiting block 453 to rotate, so that the limiting block 453 moves away from the side wall of the support block 451 and abuts against the limiting ring 440. Then, the worker taps the wedge plate 520. The wedge plate 520 drives the support block 451 away from the third connecting pipe 230. The support block 451 drives the limiting block 453 to slide. The limiting block 453 drives the limiting ring 440 and the docking plug 410 to continue to slide towards the fourth connecting pipe 420, so that the docking plug 410 abuts against the sealing ring 430. At the same time, the support block 451 drives the drive rod 541 to slide radially along the fourth connecting pipe 420. The drive rod 541 drives the correction ring 542 to be inserted into the correction groove. Under the action of the two correction rings 542, the docking plug 410 and the fourth connecting pipe 420 are concentric and tend to move towards the switch valve 300.

[0052] Start the ground pump 100 and pour concrete into it. The ground pump 100 delivers the concrete to the first connecting pipe 210, and then through the first connecting pipe 210, the second connecting pipe 220, the third connecting pipe 230, the shut-off valve 240, the fourth connecting pipe 420, and the switch valve 300 into the space between the arched corrugated steel plate 800 and the arch. After the concrete at the lower position is poured, close the shut-off valve 240, then separate the third connecting pipe 230 from the fourth connecting pipe 420, and then use the electric hoist 640 to move the third connecting pipe 230... 0. Move closer to the pouring hole at the higher position and pour from low to high, from both sides to the middle. At the same time, observe the overflow of the switch valve 300 at the lower position and turn the switch valve 300 to close it when overflow occurs. When pouring at the highest point, observe multiple overflow holes in sequence along the direction away from the pouring hole. When the overflow hole is full of grout, seal the overflowing overflow hole in sequence, and then close the switch valve 300 at the highest point to reduce the outflow of concrete from the pouring hole and make the concrete between the arched corrugated steel plate 800 and the arch web dense.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method of placing concrete in a confined space, characterised in that, Includes the following steps: S1. Construction preparation S1.1 Transport the pouring equipment to the location where pouring is to be carried out; S1.2, Install formwork support; S1.

3. Make pouring holes in the template and install pouring pipes; S1.

4. An overflow hole shall be opened at the highest point of the pouring location; S2, pouring S2.1 Connect the pouring equipment and the pouring pipe, and use the pouring equipment to deliver concrete into the pouring pipe; S2.2 Observe whether grout is coming out of the overflow hole. If grout is coming out, observe whether the hole is full of grout. If the hole is full of grout, stop pouring and seal the overflow hole. In step S1, multiple overflow holes are opened at the highest point of the pouring position, and the multiple overflow holes are equally spaced along the direction away from the pouring hole; the multiple overflow holes are observed in sequence in the direction away from the pouring hole, and the overflow holes are sealed when the overflow holes are full of grout. The pouring equipment includes a ground pump, connecting pipes, and a switch valve. The switch valve is connected to the discharge end of the ground pump via the connecting pipes and is located on the pouring pipe above the pouring hole. The connecting pipes include a first connecting pipe, a second connecting pipe, and a third connecting pipe. The first connecting pipe is located at the discharge end of the ground pump. The second connecting pipe is connected to the first connecting pipe away from the ground pump and is a flexible hose. The third connecting pipe is located on the second connecting pipe and has a connecting mechanism for connecting to the switch valve. The connecting mechanism includes a docking plug, a fourth connecting tube, a sealing ring, a limiting ring, and a limiting component. The docking plug is disposed on the third connecting tube, and the diameter of the docking plug gradually decreases at the end away from the third connecting tube. The fourth connecting tube is disposed on the switch valve, and the docking plug is inserted into the fourth connecting tube. The sealing ring is disposed inside the fourth connecting tube and abuts against the outer wall of the docking plug. The limiting ring is disposed on the third connecting tube, and the limiting component is disposed on the fourth connecting tube and connected to the limiting ring. The limiting assembly includes a support block, a rotating bar, a limiting block, and a torsion spring. Multiple support blocks are provided on the fourth connecting pipe. The rotating bar is rotatably mounted on the support block. The torsion spring is mounted on the support block and connected to the rotating bar, causing the rotating bar to rotate parallel to the fourth connecting pipe. The limiting block is located at one end of the rotating bar. The side wall of the limiting block near the support block abuts against the side wall of the limiting ring away from the fourth connecting pipe. A guide surface is provided on the side wall of the limiting block away from the support block to facilitate the sliding of the limiting ring between the limiting block and the support block.

2. A method of placing concrete in a confined space according to claim 1 wherein In step S1, multiple pouring holes are provided, and the pouring holes are symmetrically opened along the length of the pouring space; at the same time, multiple pouring holes are opened along the circumference of the template according to the pouring height, and the pouring is carried out in layers to reduce the segregation of concrete and make the concrete pouring more compact.

3. A method of placing concrete in a confined space according to claim 2, wherein The support block is slidably disposed on the fourth connecting pipe along the length direction of the fourth connecting pipe. A sealing correction mechanism is provided on the fourth connecting pipe. The sealing correction mechanism includes a fixed plate and a wedge plate. The fixed plate is disposed on the fourth connecting pipe. The fixed plate is located on one side of the support block. A sliding hole is opened on the fixed plate. The wedge plate is slidably disposed in the sliding hole. One end of the wedge plate is located between the support block and the limiting block. The wedge plate abuts against and drives the support block away from the third connecting pipe.

4. A method of placing concrete in a confined space according to claim 3 wherein, The docking plug is provided with a calibration groove, and the sealing calibration mechanism further includes a calibration component, which includes a drive rod and a calibration ring. Multiple drive rods are slidably connected to the fourth connecting pipe. The drive rods pass through the inner wall of the fourth connecting pipe and extend into the fourth connecting pipe. The calibration ring is provided at one end of the drive rod located inside the fourth connecting pipe. The calibration ring is inserted into the calibration groove, making the docking plug coaxial with the fourth connecting pipe. The end of the drive rod away from the calibration ring has an inclined surface and abuts against the support block. When the support block moves away from the limiting ring, it drives the drive rod to move closer to the docking plug.

5. A method of placing concrete in a confined space according to claim 4 wherein, The fourth connecting pipe is provided with a hook and a limiting rod. The hook is rotatably mounted on the fourth connecting pipe, and the limiting rod is mounted on the rotating bar. The hook is connected to the limiting rod.

6. The method for concrete pouring in a confined space according to claim 1, characterized in that, The pouring equipment also includes an adjustment mechanism, which includes a support frame, a drive assembly, and an electric hoist. The support frame is disposed on one side of the template, the electric hoist is slidably disposed on the support frame, the drive assembly is disposed on the support frame and drives the electric hoist to slide, and the hook of the electric hoist is connected to the third connecting pipe.

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