A water pressure test system for a bell and spigot pipe

Abstract

The utility model relates to prestressed steel cylinder concrete pipe installation technical field, concretely relates to a water pressure test system of socket joint pipe, including the blind head subassembly and counterweight structure, the blind head subassembly includes the blind head pipe fitting, first steel sheet, jack combination, second steel sheet, steel frame, concrete back wall and back soil body that abutment sets gradually along the pipeline longitudinal direction, the blind head pipe fitting is connected with the port socket of pipeline, and the counterweight structure includes the pipe -wrapped counterweight block, and the pipe -wrapped counterweight block is covered and set on the pipeline, and the pipe -wrapped counterweight block includes reinforced concrete cast -in -situ block. Through the counterweight structure can effectively avoid the radial deviation of pipeline end position under the action of water pressure, through first steel sheet, second steel sheet and steel frame, can make the pushing force of jack effectively evenly dispersed in the pipeline longitudinal direction, improve the overall structural strength of blind head subassembly, improve the overall structural stability of water pressure test system, reduce the test safety risk.

Description

Technical Field

[0001] This utility model relates to the field of prestressed steel cylinder concrete pipe installation technology, specifically to a water pressure testing system for socket-type interface pipes. Background Technology

[0002] PCCP pipes and ductile iron pipes are suitable for large-diameter, high-pressure, and high-coverage water supply projects. Their pipe connection methods involve flexible joints with rubber rings and sockets. Before being put into use, they need to undergo water pressure tests in sections. Existing water pressure tests generally use the water injection method. Chinese utility model patent CN205781676U discloses a sealing device for water pressure testing of prestressed steel cylinder concrete pipes. By using jacks, steel plates, concrete beams, and undisturbed soil as a backing, it can control the longitudinal displacement of the pipe during the test to a certain extent and improve the safety of the pipe water pressure test. However, in actual tests, it was found that the structural strength of the backing part of the existing structure needs to be further improved. The pipe exhibits radial floating under internal water pressure and is prone to upward, downward, left, and right displacement at the beginning and end of the pipe. This leads to unstable contact between the socket and the pipe, posing a risk of radial slippage and still presenting certain safety hazards. Utility Model Content

[0003] The purpose of this invention is to overcome the safety hazard of radial slippage risk in existing socket-type pipes under water pressure, and to provide a water pressure testing system for socket-type pipes.

[0004] This utility model provides a hydrostatic testing system for socket-type pipes, including:

[0005] The blind end assembly includes a blind end fitting, a first steel plate, a jack assembly, a second steel plate, a steel frame, a concrete back wall, and a back soil body arranged sequentially along the longitudinal direction of the pipeline. The blind end fitting is connected to the port of the pipeline by a socket.

[0006] The counterweight structure includes a pipe-encasing counterweight block, which is installed on the pipe and is made of reinforced concrete.

[0007] Preferably, the pipe-inserting counterweight is cubic in shape, the distance between the pipe-inserting counterweight and the pipe end face is 50-55cm, and the length of the pipe-inserting counterweight along the longitudinal direction of the pipe is not less than 3m.

[0008] Preferably, the counterweight structure includes backfill soil covering the pipe-encasing counterweight block, with the side of the backfill soil closest to the pipe port being 50-55cm away from the pipe-encasing counterweight block.

[0009] Preferably, the backfill soil is sloped on the side near the pipe port, with a slope of 45°.

[0010] Preferably, the pipeline is positioned within a trench with an inverted trapezoidal cross-section, and the backfill soil is flush with the top surface of the trench.

[0011] Preferably, the steel frame comprises a plurality of crisscrossing steel members, adjacent steel members are welded together, and the steel frame is welded together with the second steel plate.

[0012] Preferably, the jack assembly includes at least four jacks, which are arranged in a ring and abut against the first steel plate and the second steel plate. The thickness of the first steel plate is not less than 14 mm, and the thickness of the second steel plate is not less than 20 mm.

[0013] Preferably, the concrete back wall comprises a plurality of precast reinforced concrete blocks spliced ​​together, wherein the thickness of the precast reinforced concrete blocks is greater than or equal to 1m and the height is greater than or equal to 1m.

[0014] Preferably, the end cap fitting includes a first end cap pipe, which has a first branch pipe, a second branch pipe and a first drain pipe. The first branch pipe is connected to a water pump, and a first ball valve, a check valve and a flow meter are sequentially installed on the first branch pipe. The second branch pipe has a second ball valve and a pressure gauge. The first branch pipe and the second branch pipe are arranged side by side and connected to the top surface of the first end cap pipe. The first drain pipe is connected to the bottom surface of the first end cap pipe, and a third ball valve is installed on the first drain pipe.

[0015] Preferably, the end cap fitting includes an end cap pipe, the end cap pipe is provided with a third branch pipe and a second drain pipe, the third branch pipe is provided with a vent valve and a pressure gauge, the third branch pipe is connected to the top surface of the end cap pipe, the second drain pipe is connected to the bottom surface of the end cap pipe, and a fourth ball valve is provided on the second drain pipe.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. This utility model provides a water pressure test system for socket-type pipes. By using the counterweight structure of reinforced concrete cast-in-place blocks to stabilize and limit the position of the pipe end, it can effectively prevent the radial displacement of the pipe end position under water pressure, improve the stability of the pipe during the water pressure test, and reduce the safety hazards of the water pressure test.

[0018] 2. This utility model provides a hydrostatic testing system for a socket-type interface pipe. By setting a first steel plate and a second steel plate at both ends of the jack, the thrust of the jack can be effectively and evenly distributed in the longitudinal direction of the pipe, avoiding radial displacement between the plug section and the pipe, and improving the structural stability of the system.

[0019] 3. This utility model provides a hydrostatic testing system for socket-type interface pipes. By setting a steel frame between the concrete back wall and the second steel plate, the overall structural strength of the plug assembly is improved, which can provide a stable back thrust, improve the effective dispersion of the jack's contact force, further improve the overall structural stability of the hydrostatic testing system, and reduce the test safety risks. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the water pressure test system at the beginning of the pipeline in Example 1.

[0021] Figure 2 This is a schematic diagram of the water pressure test system at the end of the pipeline in Example 1.

[0022] Figure 3 This is a schematic diagram of the cross-sectional structure of the counterweight structure described in Example 1.

[0023] Figure 4 This is a schematic diagram of the structure of the first steel plate, the jack assembly, the second steel plate, and the steel frame assembly in Embodiment 1.

[0024] Figure 5 for Figure 4 The corresponding side view.

[0025] Marked in the image:

[0026] 1-Initial end cap pipe, 11-First branch pipe, 111-Water pump, 112-First ball valve, 113-Check valve, 114-Flow meter, 12-Second branch pipe, 121-Second ball valve, 122-Pressure gauge, 13-First drain pipe, 131-Third ball valve

[0027] 2-End cap pipe, 21-Third branch pipe, 211-Air vent valve, 212-Pressure gauge, 22-Second drain pipe, 221-Fourth ball valve.

[0028] 3-First steel plate,

[0029] 4-jack combination,

[0030] 5-Second steel plate,

[0031] 6-Steel frame,

[0032] 7- Concrete back wall, 71- Reinforced concrete precast block,

[0033] 8-Back soil mass,

[0034] 9-Ensure the counterweight,

[0035] 10 - Backfill soil, 101 - Slope surface

[0036] 20-pipeline,

[0037] 30 - Groove. Detailed Implementation

[0038] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0039] Unless otherwise specified, the terms "upper," "lower," "left," "right," "center," "inner," and "outer" used in the description of specific embodiments of this utility model to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is usually placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, and for enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0040] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are arranged as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when arranged in "horizontal," "vertical," "suspended," "parallel," or "coaxial" directions, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0041] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0042] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0043] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0044] Example 1

[0045] like Figures 1-5As shown, a hydrostatic testing system for a socket-type interface pipe includes a plug assembly and a counterweight structure. The plug assembly includes a plug fitting, a first steel plate 3, a jack assembly 4, a second steel plate 5, a steel frame 6, a concrete back wall 7, and a back soil 8, which are sequentially abutted along the longitudinal direction of the pipe 20. The plug fitting is socketed to the end of the pipe 20. The counterweight structure includes a pipe-encasing counterweight block 9, which is wrapped around the pipe 20 and is composed of a reinforced concrete cast-in-place block.

[0046] like Figures 1-3 As shown, the counterweight structure is installed on the pipe 20. By increasing the weight of the end of the pipe 20, the counterweight structure plays a stabilizing role at the end of the pipe 20, making it less likely for the end area of ​​the pipe 20 to shift under water pressure. The contact force between the end fitting and the pipe 20 is always along the longitudinal direction of the pipe 20, and the connection between the end fitting and the pipe 20 is always stable, improving the safety of the water pressure test.

[0047] In an optional embodiment, the pipe-insulating counterweight 9 is cubic in shape, the distance between the pipe-insulating counterweight 9 and the end face of the pipe 20 is 50-55cm, and the length of the pipe-insulating counterweight 9 along the longitudinal direction of the pipe 20 is not less than 3m.

[0048] In an optional embodiment, the pipe-encasing counterweight 9 is a reinforced concrete structural block formed by erecting a formwork and casting it in place. The pipe-encasing counterweight 9 completely covers the pipe 20, increases the weight of the end of the pipe 20, improves the structural stability of the end of the pipe 20, and effectively suppresses the end of the pipe 20 from moving up, down, left, or right under water pressure.

[0049] In an optional embodiment, the length of the pipe-encasing counterweight 9 can be 3m, the distance from the end face of the pipe 20 is 50cm, and it is made of C25 concrete and a steel reinforcement cage.

[0050] In an optional embodiment, when the pipe 20 is limited within the inverted trapezoidal trench 30, the counterweight structure may further include backfill soil 10 covering the pipe-encasing counterweight block 9, with the side of the backfill soil 10 closest to the pipe 20 port being 50-55cm away from the pipe-encasing counterweight block 9.

[0051] In an optional embodiment, the backfill soil 10 can be sloped at a 1:1 gradient from 50cm away from the side of the pipe counterweight block 9 near the end face of the pipe 20 to the top surface of the trench 30, forming a slope surface 101 with a slope of 45°, and then compacted to make the backfill soil 10 flush with the top surface of the trench 30, so as to reduce the length of the pipe 20 exposed and improve the stability of the end of the pipe 20.

[0052] like Figure 4 , Figure 5As shown, the steel frame 6 is used to be set between the second steel plate 5 and the concrete back wall 7 to strengthen the integrity of the concrete back wall 7, improve the structural strength of the concrete back wall 7, distribute and transmit the pushing force of the jack, improve the overall stability of the blind assembly during use, and improve the safety of the test.

[0053] In an optional embodiment, the steel frame 6 includes several steel members arranged in a crisscross pattern, adjacent steel members are welded together, and the steel frame 6 is welded together with the second steel plate 5.

[0054] In an optional embodiment, the steel members can be frame structures made of 300mm*300mm H-beams welded together, and multiple jacks can be abutted against the H-beams located in the middle.

[0055] like Figure 4 , Figure 5 As shown, the jack assembly 4 is used to provide synchronous thrust through multiple jacks to compensate for the distance between the end assembly and the back soil 8 under the action of water pressure in the pipeline 20, ensuring that the water pressure can be transmitted to the back soil 8, maintaining the overall structural stability of the water pressure test system, and through the combination of steel frame 6, first steel plate 3 and second steel plate 5, the test system as a whole transmits force along the pipe axis.

[0056] In an optional embodiment, the jack assembly 4 includes four 50t jacks, which are arranged in a matrix and abut against the first steel plate 3 and the second steel plate 5. The four jacks are symmetrically distributed around the center of the pipe 20 to ensure that the thrust is evenly distributed.

[0057] In an optional embodiment, the first steel plate 3 can be a circular steel plate with a thickness of 14mm, and the first steel plate 3 can be fitted to the end face of the end cap fitting. The second steel plate 5 can be a rectangular steel plate with a thickness of 20mm, and the second steel plate 5 can be fitted to the outer dimensions of the steel frame 6.

[0058] In an optional embodiment, the concrete back wall 7 includes a plurality of precast reinforced concrete blocks 71 spliced ​​together, wherein the thickness of the precast reinforced concrete blocks 71 is greater than or equal to 1m and the height is greater than or equal to 1m.

[0059] In an optional embodiment, the precast reinforced concrete block 71 can be a cube precast block with a side length of 1m. Nine precast reinforced concrete blocks are assembled in three rows and three columns. One side is attached to the steel frame 6 and the other side is attached to the back soil 8. The steel members of the steel frame 6 realize the integration of the precast reinforced concrete blocks 71 in each row and column, thereby improving the structural stability.

[0060] In an optional embodiment, the back soil 8 can be undisturbed soil or artificially compacted soil. The width of the back soil 8 is not less than 3m. A grouting filling layer is provided between the back soil 8 and the concrete back wall 7, and a mortar pouring layer is provided on the top surface of the back soil 8 to ensure that the back soil 8 can meet the requirements of the water pressure test.

[0061] like Figure 1 , Figure 2 As shown, the end cap assembly is used to be installed at the beginning or end of the pipe 20 to form a water pressure test pipe section between two sets of end cap assemblies. By injecting water into the pipe section between the two end cap assemblies and maintaining pressure for a certain period of time, the pipe 20 is tested. The end cap assemblies located at the beginning and end of the pipe 20 can be set to have the same structure. The only difference is that different monitoring equipment can be set according to the monitoring requirements.

[0062] In optional implementations, such as Figure 1 As shown, the blind end fitting may include a first blind end pipe 1, which has a first branch pipe 11, a second branch pipe 12, and a first drain pipe 13. The first branch pipe 11 is connected to a water pump 111, and a first ball valve 112, a check valve 113, and a flow meter 114 are sequentially installed on the first branch pipe 11. The second branch pipe 12 has a second ball valve 121 and a pressure gauge 212122. The first branch pipe 11 and the second branch pipe 12 are arranged side by side and connected to the top surface of the first blind end pipe 1. The first drain pipe 13 is connected to the bottom surface of the first blind end pipe 1, and a third ball valve 131 is installed on the first drain pipe 13. The first branch pipe 11, the second branch pipe 12, and the first drain pipe 13 are all seamless steel pipes. Water is injected along the first branch pipe 11 by the water pump 111, and the water injection is observed through the flow meter 114 and the second branch pipe 12. After the test, water is drained from the first drain pipe 13.

[0063] In optional implementations, such as Figure 2 As shown, the blind-ended pipe fitting includes a terminal blind-ended pipe 2, which has a third branch pipe 21 and a second drain pipe 22. The third branch pipe 21 is equipped with a vent valve 211 and a pressure gauge 212122. The third branch pipe 21 is connected to the top surface of the terminal blind-ended pipe 2, and the second drain pipe 22 is connected to the bottom surface of the terminal blind-ended pipe 2. A fourth ball valve 221 is installed on the drain pipe of the second drain pipe 22. Both the third branch pipe 21 and the second drain pipe 22 are seamless steel pipes. Water injection and drainage are achieved through the vent valve 211, and the internal pressure of the pipe 20 is observed through the pressure gauge 212122.

[0064] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hydrostatic testing system for socket-type pipes, characterized in that, include: The blind end assembly includes a blind end fitting, a first steel plate (3), a jack assembly (4), a second steel plate (5), a steel frame (6), a concrete back wall (7), and a back soil body (8) arranged longitudinally along the pipeline (20). The blind end fitting is connected to the port of the pipeline (20) by a socket. The counterweight structure includes a pipe-encasing counterweight block (9), which is installed on the pipe (20) and is made of reinforced concrete.

2. The hydrostatic testing system for a socket-type interface pipe according to claim 1, characterized in that, The tube-inserting counterweight (9) is cubic in shape. The distance between the tube-inserting counterweight (9) and the end face of the pipe (20) is 50-55cm. The length of the tube-inserting counterweight (9) along the longitudinal direction of the pipe (20) is not less than 3m.

3. The hydrostatic testing system for a socket-type interface pipe according to claim 2, characterized in that, The counterweight structure includes backfill soil (10) covering the pipe-encasing counterweight block (9), with the side of the backfill soil (10) near the pipe (20) port 50-55cm away from the pipe-encasing counterweight block (9).

4. The hydrostatic testing system for a socket-type interface pipe according to claim 3, characterized in that, The backfill soil (10) is set as a slope (101) on one side near the port of the pipe (20), and the slope of the slope (101) is 45°.

5. A hydrostatic testing system for a socket-type interface pipe according to claim 4, characterized in that, The pipe (20) is positioned within a trench (30) with an inverted trapezoidal cross-section, and the backfill soil (10) is flush with the top surface of the trench (30).

6. A hydrostatic testing system for a socket-type interface pipe according to any one of claims 1-5, characterized in that, The steel frame (6) includes several steel members arranged in a crisscross pattern. Adjacent steel members are welded together. The steel frame (6) is welded together with the second steel plate (5).

7. A hydrostatic testing system for a socket-type interface pipe according to claim 6, characterized in that, The jack assembly (4) includes at least four jacks, which are arranged in a ring and abut against the first steel plate (3) and the second steel plate (5). The thickness of the first steel plate (3) is not less than 14 mm, and the thickness of the second steel plate (5) is not less than 20 mm.

8. A hydrostatic testing system for a socket-type pipe according to claim 6, characterized in that, The concrete back wall (7) includes several precast reinforced concrete blocks (71) spliced ​​together, wherein the thickness of the precast reinforced concrete blocks (71) is greater than or equal to 1m and the height is greater than or equal to 1m.

9. A hydrostatic testing system for a socket-type pipe according to claim 6, characterized in that, The blind end fitting includes a first end blind end pipe (1), which is provided with a first branch pipe (11), a second branch pipe (12) and a first drain pipe (13). The first branch pipe (11) is connected to a water pump (111). A first ball valve (112), a check valve (113) and a flow meter (114) are sequentially provided on the first branch pipe (11). A second ball valve (121) and pressure gauges (212) (122) are provided on the second branch pipe (12). The first branch pipe (11) and the second branch pipe (12) are arranged side by side and connected to the top surface of the first end blind end pipe (1). The first drain pipe (13) is connected to the bottom surface of the first end blind end pipe (1). A third ball valve (131) is provided on the first drain pipe (13).

10. A hydrostatic testing system for a socket-type interface pipe according to claim 9, characterized in that, The end cap fitting includes an end cap pipe (2), the end cap pipe (2) is provided with a third branch pipe (21) and a second drain pipe (22), the third branch pipe (21) is provided with a vent valve (211) and a pressure gauge (212)(122), the third branch pipe (21) is connected to the top surface of the end cap pipe (2), the second drain pipe (22) is connected to the bottom surface of the end cap pipe (2), and a fourth ball valve (221) is provided on the second drain pipe (22).

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