A convenient water-conducting pipeline plugging device and its construction method

Abstract

The present invention provides a convenient water-conducting pipe plugging device, which includes: an expansion block, a tubular solid rubber sleeve, a T-threaded water conduit, and a clamping assembly; the expansion block is a truncated cone-shaped hollow structure with holes on both sides; the tubular solid rubber sleeve is provided with a groove and a water conduit installation channel; the T-threaded water conduit includes a disc plate with a central hole and a hollow steel pipe, a valve is installed at the end of the hollow steel pipe away from the disc plate, and the side wall of the hollow steel pipe is provided with an external thread; the clamping assembly is used to adjust the position of the hollow steel pipe relative to the tubular solid rubber sleeve, and drive the expansion block to press the tubular solid rubber sleeve tightly to fix the tubular solid rubber sleeve on the inner wall of the pipe. Based on the construction method of the above-mentioned pipe plugging device, the installation operation process is simple, does not need to rely on complex mechanical equipment, and also has a water-conducting function, is easy to achieve upstream water level adjustment, avoids the inconvenience caused by repeated disassembly of the plugging device, not only saves costs, but also reduces the safety hazards caused by excessively high water levels.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage interception engineering, and specifically relates to a convenient water-conducting pipe blocking device, and also relates to a construction method based on the convenient water-conducting pipe blocking device. Background Art

[0002] At present, the mixing of rainwater and sewage pipes in many urban drainage systems is serious. When the rainwater and sewage pipe diversion project is carried out, the sewage pipe system will continue to operate, and sewage will flow into the construction site continuously, which increases the difficulty of interception construction and also brings safety hazards.

[0003] In the existing municipal rainwater and sewage confluence network, in order to achieve rainwater and sewage diversion, a stable, water-free environment must be created when intercepting sewage at the confluence node to meet construction quality and safety requirements. The current conventional practice is to seal airbags upstream and downstream of the inspection well and pump out water. However, during actual construction, the long-term sealing of the airbags in the pipeline will inevitably cause the water level in the upstream inspection well to rise, forming a strong water pressure, and the lateral pressure borne by the airbags will gradually increase. If the airbag sealing problem causes the air pressure to drop, or the friction between the airbag and the pipe wall is insufficient to offset the lateral pressure caused by the high water level, the airbag will be directly washed away by the high-pressure water, posing a huge safety hazard to the workers involved in the construction. In addition, sealing the airbags requires a lot of specialized mechanical equipment, such as generators, air compressors, and instrumentation, which is not conducive to convenient on-site construction operations.

[0004] Based on this, a pipe sealing device with a simple structure, easy operation and water-conducting function is provided, which can not only effectively solve the problem of water continuously flowing into the construction work surface in the existing pipeline network in the sewage interception project, but also provide good working conditions for the construction work and effectively reduce safety hazards. Summary of the Invention

[0005] One of the purposes of the present invention is to provide a pipe plugging device with a simple structure, convenient operation and water-conducting function.

[0006] The second purpose of the present invention is to provide a construction method that can effectively solve the problem of water continuously flowing into the construction work surface in the existing pipeline network in sewage interception projects.

[0007] The technical solution adopted by the present invention to achieve one of the objectives is to provide a convenient water-conducting pipe sealing device, which includes: an expansion block, a tubular solid rubber sleeve, a T-threaded water conduit and a pressing assembly;

[0008] The expansion block is a truncated cone-shaped hollow structure, and its upper and lower bottom surfaces are respectively provided with a connected expansion block upper bottom hole and expansion block lower bottom hole;

[0009] A groove for accommodating the expansion block is formed at one end of the tubular solid rubber sleeve, and a water pipe installation channel is formed at the bottom of the groove at a position corresponding to the upper bottom hole of the expansion block;

[0010] The T-shaped threaded water conduit comprises a disc plate and a hollow steel pipe; the disc plate is arranged inside the expansion block, its diameter is larger than the diameter of the upper bottom hole of the expansion block, and a water conduit hole is opened in the center; the hollow steel pipe passes through the upper bottom hole of the expansion block and the water conduit installation channel, and a valve is installed on the end away from the disc plate; the side wall of the hollow steel pipe is provided with an external thread;

[0011] The clamping assembly is arranged on the side of the tubular solid rubber sleeve away from the expansion block, and the clamping assembly includes an internal thread matching the external thread; the clamping assembly is used to adjust the position of the hollow steel pipe relative to the tubular solid rubber sleeve, and drive the expansion block to tighten the tubular solid rubber sleeve to fix the tubular solid rubber sleeve on the inner wall of the pipe.

[0012] On the basis of the above technical solution, the clamping assembly includes a pressure plate, a pad and a handwheel, and the handwheel is provided with an internal thread matching the external thread.

[0013] Based on the above technical solution, the diameter of the lower bottom hole of the expansion block is larger than the diameter of the disc plate.

[0014] On the basis of the above technical solution, a detachable filter screen is installed at the bottom hole of the expansion block.

[0015] On the basis of the above technical solution, the material of the expansion block and the T-shaped threaded water pipe is selected from one of iron and stainless steel.

[0016] On the basis of the above technical solution, the disc plate and the hollow steel pipe are connected by welding, and an elastic leak-proof gasket is further provided on the side of the disc plate close to the upper bottom hole of the expansion block.

[0017] On the basis of the above technical solution, a water pressure monitoring gauge is provided at the connection between the hollow steel pipe and the valve, and a long water-conducting hose is connected to the side of the valve away from the hollow steel pipe.

[0018] The technical solution adopted by the present invention to achieve the second purpose is to provide a construction method of the convenient water-conducting pipe plugging device according to the first purpose of the present invention, comprising the following steps:

[0019] S1. Select the appropriate expansion block, tubular solid rubber sleeve, and T-threaded water pipe according to the pipe specifications required for water sealing. Clean the inner wall of the pipe and check the outer ring of the tubular solid rubber sleeve for wear. If any wear is found, replace it promptly.

[0020] S2. Pass the hollow steel pipe of the T-threaded water conduit through the upper bottom hole of the expansion block and the water conduit installation channel of the tubular solid rubber sleeve in sequence, so that the disc plate is located inside the expansion block on the side near the upper bottom hole of the expansion block, connecting the expansion block and the T-threaded water conduit;

[0021] S3. Install the pressure plate, pad, and handwheel of the compression assembly in sequence. Turn the handwheel so that the expansion block, driven by the disc of the T-threaded water pipe, continuously moves toward the groove of the tubular solid rubber sleeve and squeezes it, so that the solid rubber sleeve is tightly fixed to the inner wall of the pipe.

[0022] S4. Tightly fix the valve along the external thread of the hollow steel pipe of the T-threaded water pipe, and close the valve to complete the sealing operation of the convenient water pipe sealing device.

[0023] On the basis of the above technical solution, the construction method further comprises the following steps:

[0024] S5. When the water pressure monitoring gauge at the valve shows that the water level has reached the warning line, the valve is opened to perform the water discharge operation.

[0025] On the basis of the above technical solution, when water discharge operation is required, a long water-conducting hose is connected to the side of the valve away from the hollow steel pipe, and the length of the long water-conducting hose is determined according to the distance of the downstream pipeline to be connected; then the valve is opened to perform the water discharge operation.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) The present invention provides a convenient water-conducting pipe sealing device, which includes an expansion block, a tubular solid rubber sleeve, a T-threaded water conduit and a clamping assembly. The entire sealing device can be tightened by adjusting the clamping assembly and rotating it along the T-threaded water conduit. Compared with traditional air bags, the pipe sealing device provided by the present invention does not require equipment and instruments such as generators, air compressors, and pressure gauges, thereby simplifying the operation process and can be installed manually.

[0028] (2) The present invention provides a convenient water-conducting pipe plugging device, which respectively opens holes at corresponding positions of the expansion block, the tubular solid rubber sleeve, and the T-threaded water conduit to form a water conduit channel; and the valve provided at the end of the T-threaded water conduit controls the opening or closing of the water conduit channel, thereby realizing the function of regulating the water level upstream of the plugging device. During the process of regulating the upstream water level and diverting the water flow, the pipe plugging device does not need to remove the air bag or water pump to guide the water, thus avoiding the cost waste caused by repeated disassembly of the plugging device, saving costs, and reducing the safety hazards caused by excessively high water levels.

[0029] (3) The present invention provides a convenient water-conducting pipe sealing device that uses a hard expansion block to squeeze a tubular solid rubber sleeve to achieve pipe sealing. The solid block is less compressible than other materials of the same cross-section, and the relaxation deformation produced in the tightened state is smaller, thus ensuring a more secure seal. In addition, the tubular solid rubber sleeve is made of solid rubber and has stronger resistance to complex sewer pipe environments than an airbag. There is no need to worry about the entire device failing due to damage from sharp objects, thus ensuring greater safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the overall structure of a convenient water-conducting pipe plugging device provided in Example 1 of the present invention;

[0031] Figure 2 A schematic structural diagram of an expansion block provided in Example 1 of the present invention;

[0032] Figure 3 A schematic structural diagram of a T-shaped threaded water conduit provided in Example 1 of the present invention;

[0033] Figure 4 This is a schematic diagram of the assembly structure of the expansion block, the tubular solid rubber sleeve and the T-threaded water pipe in the construction method provided in Example 2 of the present invention.

[0034] Among them, 1-expansion block; 11-upper bottom hole of expansion block; 12-lower bottom hole of expansion block; 121-filter screen; 2-tubular solid rubber sleeve; 21-groove; 22-water pipe installation channel; 3-T-type threaded water pipe; 31-disc plate; 32-hollow steel pipe; 33-water guide hole; 34-valve; 35 external thread; 36-elastic leak-proof gasket; 4-clamping assembly; 41-pressure plate; 42-pad; 43-handwheel. DETAILED DESCRIPTION

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0036] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0037] The present invention will be further described below with reference to specific examples, but they are not intended to limit the present invention.

[0038] Example 1

[0039] See Figure 1This embodiment provides a convenient water-conducting pipe sealing device, which includes: an expansion block 1, a tubular solid rubber sleeve 2, a T-threaded water conduit 3 and a pressing assembly 4.

[0040] The expansion block 1 is a truncated cone-shaped hollow structure, with interconnected upper and lower expansion block holes 11 and 12 defined on its upper and lower surfaces, respectively. A recess 21 is defined at one end of the tubular solid rubber sleeve 2 to accommodate the expansion block 1. A water conduit installation channel 22 is defined at the bottom of the recess 21, corresponding to the upper expansion block hole 11. The tubular solid rubber sleeve 2 is made of solid rubber, offering advantages such as high elasticity, aging resistance, and excellent insulation and water resistance. The recess 21, formed by the hollowing out of the middle, is truncated cone-shaped to accommodate the expansion block 1.

[0041] The T-shaped threaded water pipe 3 includes a disc plate 31 and a hollow steel pipe 32; the disc plate 31 is arranged inside the expansion block 1, and its diameter is larger than the diameter of the upper bottom hole 11 of the expansion block, and a water guide hole 33 is opened at its center; the diameter of the water guide hole 33 is adapted to the diameter of the hollow steel pipe 32; the hollow steel pipe 32 passes through the upper bottom hole 11 of the expansion block and the water pipe installation channel 22, and a valve 34 is installed at one end away from the disc plate 31; the side wall of the hollow steel pipe 32 is provided with an external thread 35, and the internal thread of the valve 34 matches the external thread 35 of the hollow steel pipe 32.

[0042] The clamping assembly 4 is arranged on the side of the tubular solid rubber sleeve 2 away from the expansion block 1, and the clamping assembly 4 includes an internal thread matching the external thread 35; the clamping assembly 4 is used to adjust the position of the hollow steel pipe 32 relative to the tubular solid rubber sleeve 2, and drive the expansion block 1 to tighten the tubular solid rubber sleeve 2, so as to fix the tubular solid rubber sleeve 2 to the inner wall of the pipe.

[0043] The present invention aims to solve the problem that simple pipe blocking structures (such as air bags, etc.) cannot achieve water flow diversion and pose safety hazards during the sewage interception and treatment construction process at the mixed connection points of rainwater and sewage pipes. It provides a pipe blocking device with higher safety, easier operation and water-conducting function.

[0044] In the aforementioned pipe plugging device, a T-threaded water guide tube 3 is used to move a truncated cone-shaped expansion block 1, causing it to press against the interior of a tubular solid rubber sleeve 2 with a groove 21, thereby firmly securing the sleeve 2 to the inner wall of the pipe and thereby intercepting and plugging the pipe. Furthermore, to prevent potential safety hazards caused by excessively high water levels, the pipe plugging device is provided with a water guide channel, which is comprised, in sequence, of the expansion block's lower bottom hole 12, the expansion block's upper bottom hole 11, a water guide hole 33 in a disc 31, a hollow steel pipe 32, and a valve 34. When the upstream water pressure acting on the pipe plugging device is too high, valve 34 is opened, thereby opening the water guide channel and allowing water to flow through the aforementioned water guide components and be discharged. This allows for simple and easy control and regulation of the upstream water level. Compared with conventional pipe sealing methods, it does not require the removal of the airbag to use a water pump to guide water, and it avoids the construction inconvenience caused by repeated disassembly of the sealing structure. It more effectively avoids the safety hazards caused by excessively high upstream water levels and ensures the smooth implementation of the sewage interception project at the mixing point.

[0045] Furthermore, in this embodiment, the clamping assembly 4 includes a pressure plate 41, a cushion block 42, and a handwheel 43. The pressure plate 41 is mounted on the side of the tubular solid rubber sleeve 2 away from the expansion block 1, providing a reaction force foundation for tightening the handwheel 43. The cushion block 42 is used to withstand the pressure of the handwheel 43 and reduce wear on the handwheel 43, while also transmitting the force to the pressure plate 41. The handwheel 43 has an internal thread that matches the external thread 35 of the T-threaded water conduit 3. By rotating the handwheel 43, the position of the T-threaded water conduit 3 relative to the tubular solid rubber sleeve 2 is adjusted, thereby completing the tightening or disassembly of the entire device.

[0046] See Figure 2 In the expansion block 1, the diameter of the lower bottom hole 12 is larger than that of the disc plate 31, which facilitates the removal and installation of the T-threaded water conduit 3. Furthermore, the disc plate 31 is larger in diameter than the upper bottom hole 11 of the expansion block, allowing the disc plate 31 to block the front of the upper bottom hole 11 and securely connect the expansion block.

[0047] Furthermore, a detachable filter screen 121 is installed in the bottom hole 12 of the expansion block. The setting of the filter screen 121 can intercept impurities in the water flow entering the water channel and prevent large pieces of garbage from blocking the water channel.

[0048] Furthermore, the expansion block 1 and the T-shaped threaded water conduit 3 are made of one of iron and stainless steel. Preferably, both are made of stainless steel.

[0049] The present invention adopts a high-strength hard expansion block 1 and a T-shaped threaded water guide pipe 3 to cooperate with an elastic tubular solid rubber sleeve 2. On the one hand, by adjusting the handwheel 43 of the fastening component 4, the hard expansion block 1 is displaced, and the tubular solid rubber sleeve 2 is continuously squeezed, so that it generates sufficient friction with the pipe to be blocked, thereby realizing the positioning installation of the blocking device; on the other hand, the expansion block 1 and the T-shaped threaded water guide pipe 3 are both made of hard materials, and the water guide channel is opened inside the two. It can avoid squeezing the water guide channel during the squeezing process of the tubular solid rubber sleeve 2, which affects the smooth discharge of water flow, and can also avoid inconsistent deformation of the two after being subjected to force, which makes the tubular solid rubber sleeve 2 not tightly bonded to the pipe wall or the water guide pipe under uneven force, thereby causing hidden dangers of water leakage.

[0050] In this embodiment, the dimensions of the expansion block 1, the tubular solid rubber sleeve 2, and the T-threaded water conduit 3 can be designed by comprehensively considering the water flow rate, the pipe width, and the rigidity of the component's own material. The diameter of the lower bottom hole 12 of the expansion block should not be too large, otherwise it will affect the overall rigidity of the expansion block 1, which will be detrimental to the sealing effect. Preferably, the upper and lower bottom diameters of the expansion block 1 are DN100mm and DN150mm, respectively. The diameter of the upper bottom hole 11 of the expansion block is 3 to 5mm larger than the diameter of the hollow steel pipe 32, and the diameter of the lower bottom hole 12 of the expansion block is 10 to 20mm larger than the diameter of the disc plate 31.

[0051] See Figure 3 In this embodiment, the disc plate 31 and the hollow steel tube 32 are connected by welding. Furthermore, an elastic leak-proof gasket 36 is provided on the side of the disc plate 31 near the upper bottom hole 11 of the expansion block. The diameter of the elastic leak-proof gasket 36 is also larger than the diameter of the upper bottom hole 11 of the expansion block, thereby sealing the connection between the disc plate 31 and the upper bottom hole 11 of the expansion block, preventing water from overflowing from the gap between the two.

[0052] Preferably, a water pressure monitoring gauge is installed at the junction of the hollow steel pipe 32 and the valve 34. A long water-conducting hose is connected to the side of the valve 34 away from the hollow steel pipe 32. The water pressure monitoring gauge can issue an alert when the water pressure reaches a warning level, prompting the operator to promptly open the valve 34 to drain the water, thereby reducing safety hazards. The long water-conducting hose connected to the valve 34 can be adjusted in length based on the required distance to the downstream pipeline, controlling the direction of water outflow and facilitating smooth water flow.

[0053] Example 2

[0054] This embodiment provides a construction method of the convenient water-conducting pipe plugging device according to Embodiment 1, comprising the following steps:

[0055] Step 1: Select the appropriate sizes of expansion block 1, tubular solid rubber sleeve 2, and T-threaded water pipe 3 according to the specifications of the pipe to be sealed. Clean the inner wall of the pipe and check the outer ring of the tubular solid rubber sleeve 2 for wear. If any wear is found, replace it promptly.

[0056] Step 2: See Figure 4 Installation diagram, the hollow steel pipe 32 of the T-threaded water conduit 3 is sequentially passed through the upper bottom hole 11 of the expansion block and the water conduit installation channel 22 of the tubular solid rubber sleeve 2, so that the disc plate 31 is located inside the expansion block 1 on the side close to the upper bottom hole 11 of the expansion block, so that the expansion block 1 is connected to the T-threaded water conduit 3;

[0057] Step 3: Install the pressure plate 41, the pad 42, and the handwheel 43 of the pressing assembly 4 in sequence, and rotate the handwheel 43 so that the expansion block 1 is driven by the disc plate 31 of the T-shaped threaded water pipe 3 to continuously move toward the groove 21 of the tubular solid rubber sleeve 2 and squeeze it, so that the solid rubber sleeve 2 is tightly fixed to the inner wall of the pipe;

[0058] Step 4: Connect and fix the valve 34 tightly along the external thread 35 of the hollow steel pipe 32 of the T-threaded water pipe 3, and close the valve 34 to complete the sealing operation of the convenient water pipe sealing device.

[0059] Furthermore, the above construction method further comprises the following steps:

[0060] Step 5: When the water pressure monitoring gauge at the valve 34 shows that the water level has reached the warning line, the valve 34 is opened to perform the water discharge operation.

[0061] Preferably, when draining is required, a long water-conducting hose is connected to the side of the valve 34 away from the hollow steel pipe 32 , the length of which is determined by the distance of the downstream pipeline to be connected; and then the valve 34 is opened to drain.

[0062] The construction method provided in this embodiment based on a convenient water-conducting pipe sealing device takes into account the two requirements of sealing and water diversion during the construction of the sewage interception project at the mixing point. It can not only effectively seal the construction pipeline, but also realize the rapid diversion of water flow when the upstream water level is too high without repeatedly disassembling the sealing device.

[0063] This method can meet residents' normal living needs during construction, effectively preventing the accumulation of water exceeding the depth of upstream wells, which could cause sewage to overflow onto the road surface. Furthermore, compared to conventional pipe plugging methods, this convenient, water-conducting pipe plugging device has a simpler structure and can be quickly dismantled after construction is complete, facilitating sewage interception projects at mixed junctions.

[0064] The above are only preferred embodiments of the present invention and do not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the contents of the present invention specification should be included in the protection scope of the present invention.

Claims

1. A convenient water-conducting pipe blocking device, characterized in that: include: Expansion block (1), tubular solid rubber sleeve (2), T-threaded water conduit (3) and compression assembly (4); The expansion block (1) and the T-shaped threaded water pipe (3) are made of a material selected from iron or stainless steel; The expansion block (1) is a truncated cone-shaped hollow structure, and its upper and lower bottom surfaces are respectively provided with a connected expansion block upper bottom hole (11) and an expansion block lower bottom hole (12); the expansion block lower bottom hole (12) is installed with a detachable filter screen (121); A groove (21) for accommodating the expansion block (1) is provided at one end of the tubular solid rubber sleeve (2), and a water pipe installation channel (22) is provided at the bottom of the groove (21) at a position corresponding to the upper bottom hole (11) of the expansion block; The T-shaped threaded water conduit (3) comprises a disc plate (31) and a hollow steel pipe (32); the disc plate (31) and the hollow steel pipe (32) are connected by welding, and an elastic leak-proof gasket (36) is further provided on one side of the disc plate (31) close to the upper bottom hole (11) of the expansion block; The disc plate (31) is arranged inside the expansion block (1), and its diameter is larger than the diameter of the upper bottom hole (11) of the expansion block, and a water guide hole (33) is opened at the center of the disc plate (31); the diameter of the lower bottom hole (12) of the expansion block is larger than the diameter of the disc plate (31); the hollow steel pipe (32) passes through the upper bottom hole (11) of the expansion block and the water guide pipe installation channel (22), and a valve (34) is installed at the end away from the disc plate (31); the side wall of the hollow steel pipe (32) is provided with an external thread (35); a water pressure monitoring gauge is provided at the connection between the hollow steel pipe (32) and the valve (34), and the side of the valve (34) away from the hollow steel pipe (32) is connected to a long water guide hose; The pressing assembly (4) is arranged on a side of the tubular solid rubber sleeve (2) away from the expansion block (1), and the pressing assembly (4) includes an internal thread matching the external thread (35); the pressing assembly (4) is used to adjust the position of the hollow steel pipe (32) relative to the tubular solid rubber sleeve (2), and drive the expansion block (1) to press the tubular solid rubber sleeve (2) tightly, so as to achieve fixing the tubular solid rubber sleeve (2) on the inner wall of the pipe.

2. The convenient water-conducting pipe blocking device according to claim 1, characterized in that: The pressing assembly (4) comprises a pressing plate (41), a cushion block (42), and a hand wheel (43); the hand wheel (43) is provided with an internal thread matching the external thread (35).

3. A construction method of the convenient water-conducting pipe plugging device according to claim 1 or 2, comprising the following steps: S1. Select the appropriate sizes of the expansion block (1), tubular solid rubber sleeve (2) and T-threaded water pipe (3) according to the specifications of the pipe to be sealed. Clean the inner wall of the pipe and check the wear of the outer ring of the tubular solid rubber sleeve (2). If there is any wear, replace it in time. S2, passing the hollow steel pipe (32) of the T-shaped threaded water pipe (3) through the upper bottom hole (11) of the expansion block and the water pipe installation channel (22) of the tubular solid rubber sleeve (2) in sequence, so that the disc plate (31) is located inside the expansion block (1) on one side close to the upper bottom hole (11) of the expansion block, so that the expansion block (1) is connected to the T-shaped threaded water pipe (3); S3, sequentially install the pressure plate (41), the pad (42) and the hand wheel (43) of the compression assembly (4), rotate the hand wheel (43), so that the expansion block (1) is driven by the disc plate (31) of the T-shaped threaded water pipe (3) to continuously move toward the groove (21) of the tubular solid rubber sleeve (2), and squeeze it, so that the solid rubber sleeve (2) is tightly fixed to the inner wall of the pipe; S4, the valve (34) is connected and fixed tightly along the external thread (35) of the hollow steel pipe (32) of the T-shaped threaded water pipe (3), and the valve (34) is closed, thereby completing the sealing operation of the convenient water pipe blocking device.

4. The construction method according to claim 3, characterized in that: The following steps are also included: S5. When the water pressure monitoring meter at the valve (34) shows that the water level has reached the warning line, the valve (34) is opened to perform the water discharge operation.

5. The construction method according to claim 4, characterized in that: When a water discharge operation is required, a long water-conducting hose is connected to the side of the valve (34) away from the hollow steel pipe (32), wherein the length of the long water-conducting hose is determined according to the distance of the downstream pipeline to be connected; and then the valve (34) is opened to perform the water discharge operation.

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