A sewer pipe internal support device and a sewer pipe construction method

Abstract

The application relates to a drainage pipeline inner support device and a construction method of the drainage pipeline. The drainage pipeline inner support device comprises a movable frame, a fixed frame and an inner support assembly installed on the movable frame and the fixed frame. The inner support assembly comprises a plurality of inner support units which can be detachably assembled along the length direction. The inner support unit comprises a center pipe, a mounting sleeve rotatably installed on the center pipe, a support outer pipe radially connected to the mounting sleeve and a support piece slidably installed on the support outer pipe and used for supporting the inner top surface of the drainage pipeline. The drainage pipeline inner support device is further provided with an adjusting assembly used for adjusting the support outer pipe to be arranged vertically upward and a driving mechanism used for abutting the support piece to the inner top surface of the drainage pipeline. The application has the effect of improving the extrusion deformation of the drainage pipeline in the earthwork backfill of the foundation pit.

Description

Technical Field

[0001] This application relates to the field of pipeline laying, and in particular to an internal support device for drainage pipelines and a construction method for drainage pipelines. Background Technology

[0002] HDPE drainage pipes are a general term for thermoplastic round pipes made primarily of high-density polyethylene resin using an extrusion molding process, designed for use without internal pressure. HDPE drainage pipes offer advantages such as corrosion resistance, light weight, easy installation, and long service life, making them an environmentally friendly green product widely used in municipal drainage networks.

[0003] The construction method for HDPE drainage pipes typically includes the following steps: 1. Excavate trenches at the construction site according to the construction drawings to form a foundation pit for laying the drainage pipes; 2. Set up a foundation pit support structure in the foundation pit to support the soil on both sides of the foundation pit; 3. Lay the drainage pipes in the foundation pit and complete the sealing connection between the pipe units; 4. Use partial backfill to position the drainage pipes and conduct a water tightness test on the laid drainage pipes; 5. After the water tightness test is passed, backfill the soil.

[0004] Regarding the aforementioned technologies, the inventors believe that during the construction of large-diameter HDPE drainage pipes, the pipes are deformed by the backfill soil above them during backfilling, which affects the service life of the pipes in later use. Summary of the Invention

[0005] To mitigate the deformation of drainage pipes during backfilling of foundation pits, this application provides an internal support device for drainage pipes and a construction method for drainage pipes.

[0006] Firstly, this application provides an internal support device for a drainage pipe, employing the following technical solution: An internal support device for a drainage pipe includes a movable frame, a fixed frame, and an internal support assembly installed on the movable frame and the fixed frame. The internal support assembly includes multiple internal support units that can be detachably assembled along the length direction. Each internal support unit includes a central tube, a mounting sleeve rotatably installed on the central tube, a supporting outer tube radially connected to the mounting sleeve, and a support member slidably installed on the supporting outer tube for supporting the inner top surface of the drainage pipe. The internal support device for the drainage pipe also includes an adjustment component for adjusting the supporting outer tube to a vertically upward arrangement and a driving mechanism for abutting the support member against the inner top surface of the drainage pipe.

[0007] By adopting the above technical solution, the drainage pipe internal support device can be disassembled into a movable frame, a fixed frame, and an internal support assembly, and the internal support assembly can be further disassembled into multiple internal support units, so that the length of the internal support assembly can be adjusted according to the length of the drainage pipe.

[0008] The installation method of the aforementioned internal support device for the drainage pipe is as follows: First, place the movable frame at the end of the drainage pipe, install the first internal support unit on the movable frame, and install the internal support units one by one according to the length of the drainage pipe until all internal support units are installed. Then, assemble the fixed frame and the last internal support unit. After assembly, both the movable frame and the fixed frame are located on the outside of the drainage pipe.

[0009] Since the outer support pipe and the mounting sleeve in the inner support unit are rotatably mounted on the central pipe, when assembling the aforementioned drainage pipe inner support device, the outer support pipe in the inner support unit is located below the central pipe. Compared to directly fixing the outer support pipe to the central pipe, the structural design of the inner support unit results in a lower center of gravity and stable propulsion when pushing the movable frame and the inner support unit. Furthermore, the outer support pipe does not exert torque on the central pipe, thus extending the service life of the central pipe to an ideal level.

[0010] The aforementioned drainage pipe internal support device adjusts the position of the supporting outer pipe through the adjustment component, so that the supporting outer pipe is arranged vertically upward. The drive mechanism drives the support component to lift upward and abut against the inner top surface of the drainage pipe, thereby supporting the drainage pipe. This allows the pressure of the backfill soil on the drainage pipe to be transmitted to the internal support component, movable frame, and fixed frame, improving the situation of the drainage pipe being squeezed and deformed during the backfilling of the foundation pit. Furthermore, the drainage pipe internal support device can be removed from the drainage pipe after the foundation pit is backfilled.

[0011] Optionally, the mounting sleeve has a mounting opening that penetrates the inner and outer surfaces and communicates with the inner cavity of the supporting outer tube; the top of the central tube has a central opening, and when the supporting outer tube is arranged vertically upward, the central opening is directly opposite the mounting opening; the driving mechanism includes a central air supply pipe arranged in the central tube, a pneumatic telescopic rod communicating with the central air supply pipe and used to lift the support member, and an air supply device for supplying air to the central air supply pipe.

[0012] By adopting the above technical solution, the specific structure of the drive mechanism is disclosed. When the adjusting component adjusts the outer support tube to a vertically upward arrangement, the central opening on the central tube and the mounting opening on the mounting sleeve are aligned, allowing the pneumatic telescopic rod in the drive mechanism to extend into the outer support tube and drive the support member upward, thereby enabling the support member to support the inner top surface of the drainage pipe.

[0013] Optionally, the central tube is connected to an inwardly extending supporting inner cylinder on the inner side of the central opening. The central tube is also provided with a positioning member that is slidably installed in the supporting inner cylinder and a positioning spring that supports the positioning member. The positioning spring drives the positioning member to always have an upward lifting tendency. The mounting sleeve is provided with a positioning slot for cooperating with the positioning member on the outer edge of the mounting opening.

[0014] By adopting the above technical solution, the pre-positioning component can assist the adjustment mechanism in keeping the support outer tube in a vertically upward state, reducing the probability of the installation sleeve deflecting during the process of the drive mechanism driving the support to extend upward, and helping to ensure the reliability of the drive mechanism when driving the support to extend upward.

[0015] Optionally, the positioning member has a guide cone at one end facing away from the positioning spring, and the shape of the positioning slot matches the guide cone.

[0016] By adopting the above technical solution, the shape of the positioning element and the positioning slot is defined, making it easier for the positioning element to be inserted into the positioning slot. Before the adjustment component adjusts the support outer tube to a vertically upward state, the positioning element can be inserted into the positioning slot, thereby assisting the adjustment component in arranging the support outer tube in a vertically upward state.

[0017] Optionally, the adjustment assembly includes adjustment airbags that correspond one-to-one with the outer support tube and are installed on the outer support tube; the two ends of the inner support assembly are also provided with sealing airbags for sealing the two ends of the drainage pipe; a first air tube is detachably connected between adjacent adjustment airbags; a second air tube is detachably connected between the sealing airbag and the nearest adjustment airbag, and at least one sealing airbag is provided with an inflation valve head.

[0018] By adopting the above technical solution, the drainage pipeline construction method requires a water tightness test before backfilling the foundation pit. This involves sealing both ends of the drainage pipeline, filling it with water until it is full, waiting for a certain period of time, and then observing the water level inside the pipeline. The sealing airbag in the aforementioned adjustment component can seal the ends of the drainage pipeline, eliminating the need for additional plugs. Furthermore, during the water tightness test, since the drainage pipeline is already filled with water, the adjustment airbag on the supporting outer pipe can cause the supporting outer pipe to deflect upwards, thus ensuring that the supporting outer pipe is in a vertically upward position.

[0019] Optionally, the adjusting airbag, after inflation, is a hollow frustum-shaped airbag; the adjusting airbag has an airbag through hole for insertion of the supporting outer tube; the outer diameter of the adjusting airbag increases in the direction away from the central tube.

[0020] By adopting the above technical solution, the specific structure of the adjustment airbag is disclosed. The adjustment airbag is a frustum-shaped airbag, and its outer diameter increases in the direction away from the central tube, so that during the water tightness test, the adjustment airbag can better drive the supporting outer tube to deflect to a vertically upward state.

[0021] Optionally, the bottom of the central tube is provided with a limiting stop to restrict the deflection direction of the mounting sleeve. When the outer support tube abuts against the limiting stop, all the outer support tubes in the inner support assembly are located on the same side of the corresponding limiting stop, and the axis of the outer support tube is arranged at an angle.

[0022] By adopting the above technical solution, the setting of the limit stop ensures that the outer support tube is not vertically downward in the initial state. This ensures that during the water tightness test, all outer support tubes will deflect in the same direction, avoiding the problem of knotting and interference caused by the outer support tubes deflecting in different directions.

[0023] Optionally, both ends of the central tube are provided with support structures, and the support structures include support legs symmetrically connected to the central tube.

[0024] By adopting the above technical solution, the setting of the support structure not only facilitates the advancement of the inner support unit during installation, but also enables the support structure to transfer the pressure borne by the central pipe to the lower inner wall of the drainage pipe, thereby alleviating the bending force borne by the inner support component and helping to reduce the occurrence of bending and breakage at the connection of adjacent central pipes.

[0025] Optionally, the end face of the support leg is provided with an arrangement hole, and a pulley assembly is slidably installed in the arrangement hole. The pulley assembly can be arranged in the arrangement hole. The support leg is also provided with a compression spring in the arrangement hole, the end of which abuts against the pulley assembly. The compression spring drives the pulley assembly to always have a tendency to extend out of the arrangement hole. The end of the support leg is also provided with an arc-shaped support plate for fitting against the inner bottom surface of the drainage pipe.

[0026] By adopting the above technical solution, the specific structure of the support leg is disclosed. When the internal support device of the drainage pipe is being pushed and assembled, the pulley assembly in the support leg can assist the internal support unit in sliding and pushing within the drainage pipe. When the internal support assembly supports the inner wall of the drainage pipe, the drive mechanism drives the support member to extend upward and abut against the inner top surface of the drainage pipe, thereby compressing the compression spring inside the support leg. The pulley assembly is arranged in the arrangement hole, and the arc-shaped support plate abuts against the inner wall of the drainage pipe, thus making the stability of the internal support assembly on the inner wall of the drainage pipe more ideal.

[0027] Secondly, this application provides a method for constructing drainage pipelines, employing the following technical solution: A method for constructing a drainage pipeline includes: S1, excavating a foundation pit; S2, installing a drainage pipeline and a manhole in the foundation pit; S3, conducting a water tightness test; S4, using the aforementioned internal support device to internally support the drainage pipeline; S5, backfilling the foundation pit with earthwork; and S6, removing the internal support device from the drainage pipeline.

[0028] By adopting the above technical solution, the drainage pipe is supported by the above-mentioned internal support device before the foundation pit is backfilled, which improves the situation of the drainage pipe being squeezed and deformed during the foundation pit backfilling.

[0029] In summary, this application includes at least one of the following beneficial technical effects: An internal support device for drainage pipes, by setting up an internal support unit, an adjustment component, and a driving mechanism, allows the outer support pipe of the internal support unit to be adjusted to a vertically upward state by the adjustment component before backfilling the foundation pit, and the support head to be lifted upward and supported on the inner top surface of the drainage pipe by the driving mechanism. This improves the situation of the drainage pipe being squeezed and deformed during the backfilling of the foundation pit, and the internal support device can be removed from the drainage pipe after the backfilling of the foundation pit. By setting the adjustment component as an adjustment airbag mounted on the outer support tube, and also providing a positioning element and a positioning slot, the outer support tube can be adjusted to a vertically upward state during the water tightness test. The above adjustment method is simple and convenient, and does not require an additional outer support tube deflection output device. By setting a support structure on the central pipe, it is easier to install the inner support unit inside the drainage pipe, and it also helps to maintain the stability of the entire inner support assembly during the support process. A method for constructing drainage pipes involves using an internal support device to support the drainage pipes before backfilling the foundation pit, thereby improving the situation where the drainage pipes are squeezed and deformed during the backfilling of the foundation pit. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the drainage pipe support device arranged inside the drainage pipe in an embodiment of this application.

[0031] Figure 2 This is a schematic diagram of the movable frame in an embodiment of this application.

[0032] Figure 3 This is a schematic diagram of the fixing frame in an embodiment of this application.

[0033] Figure 4 This is an axial cross-sectional view of the inner support unit in the embodiment of this application when the outer support tube is below the central tube.

[0034] Figure 5This is an axial cross-sectional view of the inner support unit in the embodiment of this application when the outer tube is vertically upward.

[0035] Figure 6 This is a cross-sectional schematic diagram of the installation support in an embodiment of this application.

[0036] Figure 7 This is a schematic diagram of the support member in an embodiment of this application.

[0037] Figure 8 This is a cross-sectional view of the inner support unit when the outer support tube abuts against the limiting stop in the embodiment of this application.

[0038] Figure 9 yes Figure 1 A magnified view of a portion of point A in the middle.

[0039] Figure 10 This is a cross-sectional schematic diagram of the inner support unit at the support leg in an embodiment of this application.

[0040] Explanation of reference numerals in the attached drawings: 1. Movable frame; 11. Arc-shaped frame; 111. Universal caster; 12. Movable mounting ring; 121. First mounting hole; 122. First bolt; 13. Movable support rod; 14. Movable base; 141. Hollow slot; 2. Fixed frame; 21. Fixed base; 22. Fixed clamp; 221. Lower clamp part; 222. Upper clamp part; 23. Fixed support rod; 3. Inner support unit; 31. Middle Core tube; 311, Mounting protrusion; 312, Bearing; 313, Sealing ring; 314, Center opening; 315, Limiting stop; 3151, Fixing seat; 3152, Limiting rod; 32, Mounting sleeve; 321, Mounting opening; 322, Positioning slot; 33, Supporting outer tube; 34, Support component; 341, Sliding head; 3411, Wear-resistant ring groove; 3412, Wear-resistant ring; 342, Support rod; 3 43. Support block; 3431. Support arc surface; 35. Support inner cylinder; 351. Support convex ring; 36. Positioning component; 361. Positioning through hole; 362. Guide cone; 37. Positioning spring; 38. Mounting support component; 381. Metal T-tube; 382. Plastic layer; 41. Central air supply pipe; 411. Air supply branch pipe; 42. Pneumatic telescopic rod; 421. Pneumatic housing; 422. Pneumatic piston; 4 23. Pneumatic push rod; 51. First threaded section; 52. Connecting nut; 53. Second threaded section; 54. Sealing ring groove; 55. Sealing gasket ring; 6. Support leg; 61. Arrangement hole; 62. Pulley assembly; 621. Pulley bracket; 622. Sliding wheel; 623. Compression spring; 63. Arc-shaped support plate; 71. Adjusting airbag; 711. Airbag through hole; 72. Sealing airbag; 721. Inflation valve head. Detailed Implementation

[0041] The following is in conjunction with the appendix Figure 1-10This application will be described in further detail.

[0042] This application discloses a construction method for an internal support device for a drainage pipe and a drainage pipe.

[0043] Reference Figure 1 An internal support device for a drainage pipe includes a movable frame 1, a fixed frame 2, and an internal support assembly mounted on the movable frame 1 and the fixed frame 2.

[0044] Reference Figure 1 and Figure 2 The movable frame 1 includes an arc-shaped frame 11, a movable mounting ring 12 for mounting one end of the inner support assembly, and a movable support rod 13 connecting the arc-shaped frame 11 and the movable mounting ring 12. The bottom surface of the arc-shaped frame 11 is arc-shaped to fit the inner bottom surface of the drainage pipe. Universal casters 111 are mounted on the bottom of the arc-shaped frame 11, allowing the movable frame 1 to move within the drainage pipe. The movable mounting ring 12 has a first mounting hole 121 for arranging the inner support assembly. A first bolt 122 is also threaded through the movable mounting ring 12 to lock the end of the inner support assembly into the first mounting hole 121.

[0045] Reference Figure 1 and Figure 2 To facilitate the fixing of the movable frame 1 within the pit, the support device inside the drainage pipe is also equipped with a movable base 14 for placing the movable frame 1. The top surface of the movable base 14 is an arc-shaped surface that fits against the bottom surface of the arc-shaped frame 11. The movable base 14 also has a slot 141 on its top for accommodating the casters of the arc-shaped frame 11, so that the movable base 14 can be installed and fixed to the movable frame 1. Part of the movable base 14 can be pre-embedded in the bottom surface of the pit on one side of the end of the drainage pipe, so that when the movable frame 1 drives out of the drainage pipe, it can directly fall onto the movable base 14.

[0046] Reference Figure 1 and Figure 3 The fixing frame 2 includes a fixing base 21, a fixing clamp 22 for mounting the other end of the inner support assembly, and a fixing support rod 23 connecting the fixing base 21 and the fixing mounting ring. The fixing clamp 22 includes a lower clamp part 221 that is fixed to the fixing support rod 23 and an upper clamp part 222 that is detachably connected to the lower clamp part 221. Both ends of the upper clamp part 222 and the lower clamp part 221 are fixed by bolt and nut structure.

[0047] Reference Figure 1 The internal support assembly includes multiple internal support units 3 that can be detachably assembled along the length direction. The internal support units 3 come in different lengths to allow multiple internal support units 3 to be combined to form internal support assemblies of greater length, thereby meeting the size requirements of more drainage pipes.

[0048] Reference Figure 1 and Figure 4 The inner support unit 3 includes a central tube 31, a mounting sleeve 32 rotatably mounted on the central tube 31, a support outer tube 33 radially connected to the mounting sleeve 32, and a support member 34 slidably mounted inside the support outer tube 33.

[0049] Reference Figure 4 The central tube 31 has a mounting protrusion 311 in the middle for rotating the mounting sleeve 32. Bearings 312 are provided at both ends of the mounting protrusion 311, and the mounting sleeve 32 is rotatably mounted on the two sets of bearings 312. A sealing ring 313 that mates with the mounting sleeve 32 is also provided on the outside of the bearings 312 on the mounting protrusion 311.

[0050] Reference Figure 4 The central tube 31 has a central opening 314 at the top of the mounting protrusion 311. An inwardly extending support inner cylinder 35 is connected to the inner side of the central opening 314. A support protrusion ring 351 is provided at the end of the support inner cylinder 35 away from the central opening 314. A positioning member 36 and a positioning spring 37 supporting the positioning member 36 are slidably mounted inside the support inner cylinder 35. One end of the positioning spring 37 abuts against the positioning member 36 and the other end abuts against the support protrusion ring 351, so that the end of the positioning member 36 always tends to extend into the central opening 314.

[0051] Reference Figure 4 The mounting sleeve 32 has a mounting opening 321 that penetrates the inner and outer surfaces and communicates with the inner cavity of the supporting outer tube 33. The axis of the mounting opening 321 coincides with the axis of the supporting outer tube 33. The mounting sleeve 32 also has a positioning slot 322 at the outer edge of the mounting opening 321 for the positioning member 36 to engage.

[0052] Reference Figure 4 and Figure 5 When the supporting outer tube 33 on the mounting sleeve 32 is arranged vertically upwards, the central opening 314 and the mounting opening 321 are directly opposite each other. The positioning member 36, under the action of the positioning spring 37, is pushed upwards and inserted into the positioning slot 322. The positioning member 36 has positioning through holes 361 extending through both end faces. To facilitate the insertion of the positioning member 36 into the positioning slot 322, the positioning member 36 has a guide cone 362 at the end facing away from the positioning spring 37. The guide cone 362 is frustum-shaped, and the shape of the positioning slot 322 matches the guide cone 362. The aforementioned structural constraints of the positioning member 36 and the positioning slot 322 enable the positioning member 36 and the positioning slot 322 to assist in keeping the supporting outer tube 33 in a vertically upward position.

[0053] Reference Figure 6The mounting sleeve 32 and the supporting outer tube 33 are integrally formed and constitute a mounting support 38. The mounting support 38 is generally T-shaped and includes a metal T-shaped tube 381 disposed on the inner side and a plastic layer 382 disposed on the outer side of the metal T-shaped tube 381. The above-mentioned structural design of the mounting support 38 ensures the smoothness of the inner surface of the supporting outer tube 33 and effectively reduces the weight of the mounting support 38.

[0054] Reference Figure 5 and Figure 7 The support member 34 includes a sliding head 341 slidably installed inside the outer support pipe 33, a support rod 342 connected to the sliding head 341 and extending to the outside of the outer support pipe 33, and a support block 343 for abutting against the inner top surface of the drainage pipe. The sliding head 341 and the support rod 342 are coaxially arranged. The sliding head 341 has multiple wear-resistant ring grooves 3411 circumferentially formed, and wear-resistant rings 3412 that mate with the outer support pipe 33 are arranged within the wear-resistant ring grooves 3411. The support rod 342 has a clearance fit with the outer support pipe 33. The top surface of the support block 343 is a support arc surface 3431 that fits against the inner top surface of the drainage pipe.

[0055] Reference Figure 5 and Figure 8 The drainage pipe support device is also equipped with a drive mechanism that abuts the support member 34 against the top surface of the drainage pipe. The drive mechanism includes a central air supply pipe 41 arranged in the central pipe 31, a pneumatic telescopic rod 42 connected to the central air supply pipe 41 and used to lift the support member 34, and an air supply device for supplying air to the central air supply pipe 41.

[0056] Reference Figure 5 and Figure 8 A central air supply pipe 41 is arranged inside a central pipe 31 and corresponds one-to-one with the central pipe 31. The length of the central air supply pipe 41 is longer than the length of the corresponding central pipe 31 to facilitate the connection of adjacent central air supply pipes 41. In this embodiment, adjacent central air supply pipes 41 are connected using a high-pressure gas quick connector. The central air supply pipe 41 has an air supply branch pipe 411 at the opposite position of the supporting inner cylinder 35 for connection with the pneumatic telescopic rod 42.

[0057] Reference Figure 5 and Figure 8 The pneumatic telescopic rod 42 includes a pneumatic housing 421, a pneumatic piston 422 slidably mounted within the housing, and a pneumatic push rod 423 connected to the end of the pneumatic piston 422 and sealingly penetrating the pneumatic housing 421. The pneumatic housing 421 is threadedly engaged with the support ring 351 of the inner support cylinder 35, and the bottom of the pneumatic housing 421 abuts against the inner bottom surface of the central tube 31. The pneumatic push rod 423 can be inserted into the outer support tube 33 through the positioning through hole 361 of the positioning member 36 and abuts against the bottom of the support member 34.

[0058] Reference Figure 5 and Figure 8 The air supply device is a gas booster pump connected to a central air supply pipe 41 near the fixed frame 2, thereby supplying air to all central air supply pipes 41. When the gas booster pump is started, it can drive the pneumatic push rod 423 in the pneumatic telescopic rod 42 in the support device inside the drainage pipe to push out. A control valve and a pressure gauge for detecting the pressure inside the central air supply pipe 41 are also connected between the central air supply pipe 41 near the fixed frame 2 and the gas booster pump. After the gas booster pump drives all the pneumatic telescopic rods 42, it can maintain pressure by closing the aforementioned control valve, and can sense the pressure change inside the central air supply pipe 41 through the pressure gauge. If the pressure inside the central air supply pipe 41 decreases, the gas booster pump can be restarted to pressurize the central air supply pipe 41.

[0059] Reference Figure 1 and Figure 9 Adjacent central tubes 31 are connected and fixed by a docking structure. The docking structure includes a first threaded section 51 at the end of one central tube 31, a docking nut 52 threaded onto the first threaded section 51, and a second threaded section 53 at the end of the other central tube 31. The second threaded section 53 also threadedly engages with the docking nut 52, so that when the ends of the two central tubes 31 are docked, rotating the docking nut 52 on the first threaded section 51 causes a portion of the docking nut 52 to thread into the first threaded section 51 and another portion to engage with the second threaded section 53, thereby achieving docking of the two central tubes 31.

[0060] Reference Figure 1 and Figure 9 To improve the sealing effect between the two central tubes 31, a sealing ring groove 54 is provided at the end of each of the two mating central tubes 31, and a sealing gasket 55 is provided in the sealing ring groove 54. The thickness of the sealing gasket 55 is greater than the thickness of the sealing ring groove 54, so that after mating, the two sealing gaskets 55 abut against each other, thereby achieving a mating seal.

[0061] Reference Figure 10 Both ends of the central tube 31 are provided with support structures, and the support structures include support legs 6 symmetrically connected to the central tube 31. The circumferential angle between the two support legs 6 in the support structure is no greater than 60°. In this embodiment, the angle between the two support legs 6 is 30°.

[0062] Reference Figure 10The support leg 6 has an arrangement hole 61 on its end face. A pulley assembly 62 is slidably mounted on the support leg 6 within the arrangement hole 61. The pulley assembly 62 includes a pulley bracket 621 and a sliding wheel 622 rotatably mounted on the end of the pulley bracket 621. The pulley assembly 62 can be arranged within the arrangement hole 61, that is, the pulley assembly 62 can be fully retracted into the arrangement hole 61. A compression spring 623 is also provided in the arrangement hole 61 of the support leg 6, and the compression spring 623 drives the sliding wheel 622 of the pulley assembly 62 to always tend to extend out of the arrangement hole 61. An arc-shaped support plate 63 is also provided at the end of the support leg 6 for fitting against the inner bottom surface of the drainage pipe.

[0063] Reference Figure 1 and Figure 8 The drainage pipe internal support device is also equipped with an adjustment assembly for adjusting the outer support pipe 33 to a vertically upward arrangement. The adjustment assembly includes adjustment airbags 71, each corresponding to and installed outside the outer support pipe 33. The adjustment airbag 71, when inflated, forms a hollow frustum-shaped airbag, and its outer diameter increases in the direction away from the central pipe 31. The center of the adjustment airbag 71 has an airbag through-hole 711 for insertion of the outer support pipe 33. In this embodiment, both ends of the adjustment airbag 71 are secured to the outer support pipe 33 with cable ties. Adjacent adjustment airbags 71 are connected by a first air tube. The first air tube is detachably connected between the two adjustment airbags 71, and the connection between the first air tube and the adjustment airbag 71 uses a high-pressure gas quick connector.

[0064] Reference Figure 1 and Figure 8 The inner support assembly also has sealing airbags 72 at both ends for sealing the ends of the drainage pipe. The sealing airbag 72 has a sealing through-hole in the middle for the central tube 31 to pass through. A layer of waterproof sealant is applied to the sealing through-hole of the sealing airbag 72 to achieve a sealed fixation with the central tube 31. The sealing airbag 72 is connected to the adjacent adjusting airbag 71 via a second air pipe. The second air pipe is detachably connected between the adjusting airbag 71 and the sealing airbag 72, and the connection between the second air pipe and the adjusting airbag 71 / sealing airbag 72 uses a high-pressure gas quick connector. An inflation valve head 721 is also provided on the outer side of the sealing airbag 72 near the fixing frame 2, allowing inflation of the sealing airbag 72 and the adjusting airbag 71 via a gas booster pump.

[0065] Reference Figure 1 and Figure 8When the inner support assembly is submerged in water, in order to ensure that all the outer support tubes 33 in the inner support assembly rotate in the same direction under the buoyancy of the adjusting airbag 71, a limiting bracket 315 is provided at the bottom of the central tube 31 to restrict the deflection direction of the mounting sleeve 32. The limiting bracket 315 includes a fixing seat 3151 fixed on the central tube 31 and a limiting rod 3152 extending to one side of the outer support tube 33. When the outer support tube 33 abuts against the limiting bracket 315, all the outer support tubes 33 in the inner support assembly are located on the same side of the corresponding limiting bracket 315, and the axis of the outer support tube 33 is arranged at an angle.

[0066] Combination Figures 1 to 10 The aforementioned internal support device for drainage pipes is applied in the construction method of drainage pipes, and the construction method of drainage pipes includes: S100, Excavation of foundation pit: Excavation of foundation pit shall be carried out according to the pipeline route and pipeline depth.

[0067] S200, Install drainage pipes and inspection wells inside the foundation pit; S210. Install the aforementioned internal support device for the drainage pipe to the drainage pipe, as follows: The fixing bracket 2 is placed at the end of the drainage pipe, and a movable base is pre-embedded on the outside of the other end of the drainage pipe; Next, the inner support unit 3 with the sealing airbag 72 is installed on the movable frame 1. Then, the inner support units 3 are installed one by one according to the length of the drainage pipe. When connecting adjacent inner support units 3, the central pipe 31, central air supply pipe 41 and adjusting airbag 71 on the inner support unit 3 need to be connected. The movable frame 1 is then pushed inward until all inner support units 3 are installed. The movable frame 1 extends out of the drainage pipe and is placed on the movable base 14. The last inner support unit 3 also has a sealing airbag 72. Next, the last inner support unit 3 is installed on the fixed frame 2; at this time, the central tube 31 in the inner support assembly is arranged horizontally. During the assembly of the inner support assembly, the supporting outer tubes 33 in the inner support assembly are all located below the central tube 31, which makes the center of gravity of the inner support assembly low and makes the propulsion stability of the entire inner support assembly more ideal.

[0068] S300, Water Tightness Test: A gas booster pump is used to inflate the sealing airbag 72 and the adjusting airbag 71, so that the sealing airbag 72 seals both ends of the drainage pipe. Next, water is introduced into the drainage pipe until it is full. During the process of filling the drainage pipe with water, the adjusting airbag 71 gradually drives the supporting outer pipe 33 to deflect. When the water in the drainage pipe is completely filled, the supporting outer pipe 33 is vertically upward, and the positioning piece 36 is inserted into the positioning slot 322, thereby locking the supporting outer pipe 33 in a vertically upward state. After the water in the drainage pipe is completely filled, the actual leakage of the drainage pipe is calculated by the change in the liquid level at the inspection well. After the calculation is completed, a water pump is used to remove the water from the drainage pipe.

[0069] S400. The drainage pipe is internally supported by the above-mentioned drainage pipe internal support device. The central air supply pipe 41 is inflated by a gas booster pump, so that the pneumatic push rod 423 in the pneumatic telescopic rod 42 extends out and abuts against the bottom of the support member 34 and drives the support member 34 to support the inner top surface of the drainage pipe. As the pneumatic push rod 423 pushes out further, the support leg 6 of the central pipe 31 retracts, the pulley assembly 62 retracts into the arrangement hole 61, and the arc-shaped support plate 63 on the support leg 6 abuts against the inner bottom surface of the drainage pipe.

[0070] S500, for backfilling the foundation pit, an excavator is used to backfill the soil into the foundation pit. The height of each backfill should not exceed 1 meter, and the backfill soil should be compacted after each backfill.

[0071] S600. After the backfilling of the foundation pit is completed, remove the internal support device of the drainage pipe from the drainage pipe: remove the gas booster pump connected to the central air supply pipe 41, and open the control valve to retract the pneumatic telescopic rod 42 in the internal support assembly, thereby causing the support 34 to detach from the drainage pipe, and the pulley assembly 62 in the support leg 6 to extend, thereby facilitating the movement of the internal support assembly in the drainage pipe; next, separate the fixed frame 2 from the closest internal support unit 3, and gradually remove the internal support unit 3 from one side of the fixed frame 2; next, separate the movable frame 1 and the last internal support unit 3.

[0072] 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 for constructing drainage pipes, characterized in that, Including the following steps: S100, foundation pit excavation; S200. Install drainage pipes and inspection wells in the foundation pit; install the drainage pipe internal support device to the drainage pipe; the drainage pipe internal support device includes a movable frame (1), a fixed frame (2) and an internal support assembly installed on the movable frame (1) and the fixed frame (2), the internal support assembly includes multiple internal support units (3) that can be detachably assembled along the length direction, the internal support unit (3) includes a central tube (31), an installation sleeve (32) rotatably installed on the central tube (31), a support outer tube (33) radially connected to the installation sleeve (32) and a support member (34) slidably installed in the support outer tube (33) and used to support the inner top surface of the drainage pipe; the drainage pipe internal support device is also provided with an adjustment component for adjusting the support outer tube (33) to be arranged vertically upward and a drive mechanism for abutting the support member (34) against the inner top surface of the drainage pipe; the installation sleeve (32) has a through-hole and inner and outer surfaces and is connected to the inner surface of the support outer tube (33). The cavity is connected to the mounting opening (321); the top of the central tube (31) is provided with a central opening (314), and when the supporting outer tube (33) is arranged vertically upward, the central opening (314) is directly opposite the mounting opening (321); the driving mechanism includes a central air supply pipe (41) arranged in the central tube (31) and a pneumatic telescopic rod (42) connected to the central air supply pipe (41) and used to lift the support member (34); the adjustment assembly includes An adjusting airbag (71) is installed outside the supporting outer tube (33) in a one-to-one correspondence with the supporting outer tube (33); the two ends of the inner support assembly are also provided with sealing airbags (72) for sealing the two ends of the drainage pipe; a first air tube is detachably connected between adjacent adjusting airbags (71); a second air tube is detachably connected between the sealing airbag (72) and the closest adjusting airbag (71); at least one sealing airbag (72) is provided with an inflation valve head (721); S300, water tightness test; water is passed into the drainage pipe until the drainage pipe is filled; during the process of filling the drainage pipe with water, the airbag (71) is adjusted to gradually drive the outer support pipe (33) to deflect. When the water in the drainage pipe is filled, the outer support pipe (33) is arranged vertically upward. S400. The drainage pipe is internally supported by an internal support device. By supplying air to the central air supply pipe (41), the pneumatic telescopic rod (42) is driven to extend and abut against the bottom of the support member (34), and the support member (34) is driven to support the inner top surface of the drainage pipe. S500, backfilling of foundation pit; S600. Remove the internal support device of the drainage pipe from the drainage pipe.

2. The drainage pipeline construction method according to claim 1, characterized in that, The central tube (31) is connected to an inwardly extending support inner cylinder (35) inside the central opening (314). The central tube (31) is also provided with a positioning member (36) slidably installed in the support inner cylinder (35) and a positioning spring (37) supporting the positioning member (36). The positioning spring (37) drives the positioning member (36) to always have an upward lifting tendency. The mounting sleeve (32) has a positioning slot (322) arranged on the outer edge of the mounting opening (321) for cooperating with the positioning member (36).

3. The drainage pipeline construction method according to claim 2, characterized in that, The positioning element (36) has a guide cone (362) at one end facing away from the positioning spring (37), and the shape of the positioning slot (322) matches the guide cone (362).

4. The drainage pipeline construction method according to claim 1, characterized in that, The adjustment airbag (71) is a hollow frustum-shaped airbag after inflation; the adjustment airbag (71) has an airbag through hole (711) for the insertion of the support outer tube (33); the outer diameter of the adjustment airbag (71) increases in the direction away from the central tube (31).

5. A drainage pipeline construction method according to claim 1, characterized in that, The bottom of the central tube (31) is provided with a limiting stop (315) to restrict the deflection direction of the mounting sleeve (32). When the supporting outer tube (33) abuts against the limiting stop (315), all the supporting outer tubes (33) in the inner support assembly are located on the same side of the corresponding limiting stop (315), and the axis of the supporting outer tube (33) is arranged at an angle.

6. A drainage pipeline construction method according to claim 1, characterized in that, Both ends of the central tube (31) are provided with support structures, and the support structures include support legs (6) that are symmetrically connected to the central tube (31).

7. A drainage pipeline construction method according to claim 6, characterized in that, The end face of the support leg (6) is provided with an arrangement hole (61), and a pulley assembly (62) is slidably installed in the arrangement hole (61) of the support leg (6). The pulley assembly (62) can be arranged in the arrangement hole (61). The support leg (6) is also provided with a compression spring (623) with its end abutting against the pulley assembly (62) in the arrangement hole (61). The compression spring (623) drives the pulley assembly (62) to always have a tendency to extend out of the arrangement hole (61). The end of the support leg (6) is also provided with an arc-shaped support plate (63) for fitting with the inner bottom surface of the drainage pipe.

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