Glass fiber reinforced plastic ground pipe pressure test device and method without flange plugging

Abstract

The invention discloses a flange-plugging-free glass fiber reinforced plastic ground pipe pressure test device and method in the technical field of pipeline detection, and the device comprises a plugging piece which is arranged in a pipeline and is used for cutting off the pipeline, and the plugging piece comprises a connecting piece and two clamping plates which sleeve the connecting piece; the connecting piece is provided with a pressing piece used for changing the distance between the two clamping plates, and an annular air bag is arranged between the two clamping plates. The distance between the edges of the two clamping plates is gradually increased from inside to outside, and the distance between the two clamping plates is reduced to extrude the annular air bag, so that the outer diameter of the annular air bag is increased to make contact with the inner wall of the pipeline, and the pipeline is cut off. The clamping plates and the annular air bag are arranged in the pipeline, the distance between the two clamping plates is reduced, so that the annular air bag is pressed and deformed to be attached to the inner wall of the pipeline, the tested pipeline is cut off, a traditional process is changed, a plugging head does not need to be welded, a traditional welding plugging head does not need to be cut, follow-up installation construction is not affected, and the construction period is shortened and optimized.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline detection, and in particular to a flange-free glass fiber reinforced plastic ground pipe pressure testing device and method. Background Art

[0002] FRP pipe is a lightweight, high-strength, corrosion-resistant non-metallic pipe. It is made of glass fiber with a resin matrix, which is wound layer by layer on a rotating core mold according to the process requirements, and quartz sand is evenly spread between the fibers at a long distance as a sand layer; its pipe wall structure is reasonable and advanced, which can give full play to the role of the material, improve the rigidity under the premise of meeting the use strength, and ensure the stability and reliability of the product.

[0003] FRP pipes can be connected by butt-bonded connection, socket-bonded connection, socket-bonded inside-outside glued connection, rubber ring socket connection, flange connection and mastic connection; the most commonly used are rubber ring socket connection, flange connection and mastic connection. According to the process flow and medium requirements of FRP pipes, a water pressure test is required after the weld inspection of the FRP pipe. In the conventional construction process, the water pressure test of the FRP pipe is carried out in the following steps: 1) After the installation and welding of the FRP pipe is completed, two or more pipe flanges are connected together for testing in combination with the actual situation on site; 2) The sealing of the pipe end of the FRP pipe without flange is carried out by welding a FRP plugging plate, and the plug is fully welded to both ends of the FRP pipe; the traditional water pressure test can complete the welding quality inspection of the pressure FRP pipe, but because the FRP ground pipe is used as a sewage and fire protection pipe with a complex distribution, many test pipe sections, and most FRP pipe sections cannot be flanged, there are many sewage openings, and it is often necessary to weld a FRP plugging plate, which requires a lot of plugging plate cutting, welding, and re-cutting, resulting in a waste of FRP materials, which to a certain extent restricts the construction period of the project. Summary of the invention

[0004] The purpose of the present invention is to provide a FRP ground pipe pressure testing device and method that cannot be flanged, so as to solve the problem raised in the above background technology that FRP ground pipes are used as sewage and fire protection pipes with complex distribution lines, many test pipe sections, and most FRP pipe sections cannot be flanged, which requires a lot of work such as cutting, welding, and re-cutting of plugging plates, resulting in waste of FRP materials.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a fiberglass ground pipe pressure test device without flange plugging, comprising: a plugging member arranged in the pipeline and used to cut off the pipeline, the plugging member comprising a connecting member and two clamping plates sleeved on the connecting member, the connecting member is provided with a pressing member for changing the distance between the two clamping plates, and an annular air bag is provided between the two clamping plates;

[0006] The distance between the edges of the two clamping plates gradually increases from inside to outside, and the distance between the two clamping plates decreases to squeeze the annular airbag, causing the outer diameter of the annular airbag to increase and contact the inner wall of the pipeline, thereby cutting off the pipeline.

[0007] Preferably, the connecting member is a threaded rod, the pressing member is a nut sleeved on the outer wall of the threaded rod, the two clamping plates are a first clamping plate and a second clamping plate respectively, the first clamping plate is fixedly sleeved on the outer wall of the threaded rod, and the second clamping plate is slidably sleeved on the outer wall of the threaded rod.

[0008] Preferably, a through hole is provided through the end of the threaded rod, and a valve is communicated with the outer end of the through hole.

[0009] Preferably, the pressure test device further includes a C-shaped block sleeved on the edge of the end of the pipeline, and bolts for fixing the C-shaped block are provided on the C-shaped block.

[0010] Preferably, there are several C-shaped blocks, and several C-shaped blocks are annularly distributed on the pipeline.

[0011] Preferably, a support member for supporting the inner side of the annular airbag is provided on the side wall of the threaded rod.

[0012] Preferably, the support member includes a sleeve, a screw rod screwed in the sleeve, a gear rod provided at the inner end of the screw rod, and a rack slidably provided on the sleeve. The rack meshes with the gear rod and is connected to the second clamping plate.

[0013] Preferably, a support block is rotatably provided at the outer end of the screw rod.

[0014] Preferably, a method for pressure testing a non-flanged sealed fiberglass underground pipe uses a pressure test device for a non-flanged sealed fiberglass underground pipe as described above, and includes the following steps:

[0015] S1: After placing the clamping plate and the annular airbag inside the pipeline, move the pressing member to reduce the distance between the two clamping plates, squeeze the annular airbag, make the outer diameter of the annular airbag larger and contact the inner wall of the pipeline, cut off the pipeline, and form a sealed test space inside the pipeline;

[0016] S2: Inject water into the sealed test space for a pressure test.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] In this application, the clamping plate and the annular airbag are placed inside the pipeline. By reducing the distance between the two clamping plates, the annular airbag is compressed and deformed to fit the inner wall of the pipeline. The tested pipeline is truncated, changing the traditional process. There is no need to weld the sealing head, no need to cut the traditional welded sealing head, it does not affect subsequent installation construction, shortens and optimizes the construction period, the sealing device is easy to install, and can be reused multiple times, achieving the purpose of improving work efficiency and saving materials. Brief Description of the Drawings

[0019] Figure 1 It is an axial sectional view schematic diagram of the pipeline sealing by the pressure test device of the present invention;

[0020] Figure 2 It is a radial schematic diagram of the pipeline sealing by the pressure test device of the present invention;

[0021] Figure 3 It is a schematic diagram of the connection structure between the connecting piece and the supporting piece of the present invention;

[0022] Figure 4 For the present invention Figure 3 The enlarged schematic diagram of the structure at A in it.

[0023] In the figure: 1. Pipeline; 2. Clamping plate; 3. Annular airbag; 4. Connecting piece; 41. Through hole; 5. Compressing piece; 6. C-shaped block; 7. Bolt; 8. Valve; 9. Supporting piece; 91. Kit; 92. Screw rod; 93. Support block; 94. Gear rod; 95. Rack. Detailed Description of the Preferred Embodiments

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] Embodiment 1

[0026] Please refer to Figure 1 and Figure 2 , a non-flange sealing fiberglass ground pipe pressure test device, including: a sealing member, the sealing member includes a connecting piece 4 and two clamping plates 2, the two clamping plates 2 are sequentially sleeved on the outer wall of the connecting piece 4 along the length extension direction of the connecting piece 4, a compressing piece 5 is sleeved on the outer wall of the connecting piece 4, wherein, the connecting piece 4 is a threaded rod, the compressing piece 5 is a nut, the two clamping plates 2 are respectively a first clamping plate and a second clamping plate, the first clamping plate is fixedly sleeved on the outer wall of the threaded rod, the second clamping plate is slidably sleeved on the outer wall of the threaded rod, and the nut is in contact with the second clamping plate.

[0027] Please refer to Figure 1, an annular airbag 3 is provided between two clamping plates 2 (the annular airbag 3 is a rubber product made of high molecular synthetic materials such as rubber and fiber fabric through a high-temperature vulcanization process); the distance between the edges of the two clamping plates 2 gradually increases from the inside to the outside (that is, the distance between the edges of the two clamping plates 2 gradually increases when moving away from the connecting piece 4), and the annular airbag 3 is located at the edges of the two clamping plates 2; when the two clamping plates 2 are moved closer to each other to squeeze the annular airbag 3, the annular airbag 3 extends outward, ensuring that the annular airbag 3 can be fully attached to the inner wall of the pipeline 1.

[0028] It should be noted that the size of the annular airbag 3 has a diameter of 50 - 60 mm; when the annular airbag 3 is not squeezed, its outer diameter is the same as or slightly smaller than the inner diameter of the fiberglass pipeline by 2 - 3 mm.

[0029] A method for pressure testing a fiberglass underground pipeline without a flange seal is as follows:

[0030] First, place the clamping plate 2 and the annular airbag 3 inside the pipeline 1 to be tested, make the second clamping plate and the pressing member 5 close to the end of the pipeline 1, and then rotate the pressing member 5 to make the second clamping plate move closer to the first clamping plate, squeezing the annular airbag 3, so that the outer diameter of the annular airbag 3 becomes larger and contacts the inner wall of the pipeline 1, cutting off the pipeline 1 to form a closed test space inside the pipeline 1.

[0031] It should be noted that before the test, determine the size of the annular airbag 3 in combination with the cross-sectional size of the pipeline 1, then make two clamping plates 2 based on the size of the annular airbag 3, weld the connecting piece 4 to one clamping plate 2 (this clamping plate 2 refers to the first clamping plate), and then put the other clamping plate 2 (the second clamping plate) on the outer wall of the connecting piece 4, making the two clamping plates 2 initially clamp the annular airbag 3 to make them an integral body.

[0032] Second, inject water into the closed test space to conduct a pressure test on the pipeline 1.

[0033] In this embodiment, as a further optimized solution, please refer to Figure 1 , a through hole 41 is provided through the end of the threaded rod, and a valve 8 is provided at one end of the threaded rod away from the first clamping plate. The valve 8 is communicated with the through hole 41; open the valve 8, and water can be injected into or discharged from the closed space through the valve 8 and the through hole 41.

[0034] In this embodiment, as a further optimized solution, please refer to Figure 1 and Figure 2 , the pressure test device further includes a C-shaped block 6. The C-shaped block 6 is sleeved on the edge of the end of the pipeline 1, and the C-shaped block 6 is closer to the port of the pipeline 1 than the sealing member. A bolt 7 is screwed on the C-shaped block 6, and the bolt 7 is tightened to fix the C-shaped block 6 on the port of the pipeline 1 to block the sealing member and prevent the sealing member from moving.

[0035] In this embodiment, as a further optimized solution, please refer to Figure 1 and Figure 2 , there are several C-shaped blocks 6, and several C-shaped blocks 6 are annularly distributed on the pipe 1; the larger the diameter of the pipe 1, the corresponding increase in the number of C-shaped blocks 6. The C-shaped blocks 6 are used to block the movement of the annular airbag 3 due to pressure, ensuring the normal progress of the pressure test.

[0036] In this embodiment, as a further optimized solution, please refer to Figure 3 , a support member 9 is provided on the side wall of the threaded rod. There are several support members 9, and several support members 9 are annularly distributed on the outer side wall of the threaded rod. The end of the support member 9 away from the threaded rod is attached to the inner side wall of the annular airbag 3 to support the annular airbag 3, reducing the probability of the annular airbag 3 being misaligned between the two clamping plates 2. At the same time, due to the restriction of the support member 9 on the annular airbag 3, the amplitude of the annular airbag 3 extending inward when being squeezed by the clamping plates 2 is reduced, ensuring that the annular airbag 3 fully extends outward and making the annular airbag 3 fully contact and fit with the inner wall of the pipe 1.

[0037] In this embodiment, as a further optimized solution, please refer to Figure 4 , the support member 9 includes a sleeve 91, a screw rod 92, a gear rod 94 and a rack 95. The sleeve 91 is installed on the outer side wall of the threaded rod. The screw rod 92 is screwed in the inner cavity of the sleeve 91, and there is a thread on the inner side wall of the sleeve 91, which matches the screw rod 92. The gear rod 94 is provided at the inner end of the screw rod 92. The rack 95 is slidably provided on the sleeve 91. The moving direction of the rack 95 is the same as the moving direction of the second clamping plate. The rack 95 meshes with the gear rod 94, and one end of the rack 95 is connected to the second clamping plate; when the second clamping plate moves closer to the first clamping plate, it will drive the rack 95 to move, causing the gear rod 94 and the screw rod 92 to rotate; due to the thread inside the sleeve 91, the screw rod 92 will move outward of the sleeve 91 during rotation, providing a thrust to the inner wall of the annular airbag 3, causing the annular airbag 3 to extend outward, further ensuring that the annular airbag 3 can fully contact the inner wall of the pipe 1; and when the second clamping plate 2 moves in the reverse direction to reset, the rack 95 moves in the reverse direction, causing the gear rod 94 to rotate in the reverse direction, causing the screw rod 92 to move into the interior of the sleeve 91; the gear rod 94 has a certain length, so that when the screw rod 92 rotates and moves outward of the sleeve 91, the gear rod 94 still meshes with the rack 95.

[0038] It should be noted that the rack 95 and the second clamping plate are detachably connected (such as by using the connection method of bolts and nuts), so that the connection between the second clamping plate and the rack 95 can be disconnected.

[0039] In this embodiment, as a further optimized solution, please refer to Figure 4, a support block 93 is rotatably provided on the outer end of the screw rod 92; when the screw rod 92 rotates and moves outward to the outer side of the sleeve 91, the support block 93 will be in contact with the inner side wall of the annular airbag 3. Since the support block 93 is rotatably connected to the screw rod 92, when the screw rod 92 continues to rotate, the support block 93 will not rotate accordingly, reducing the probability of wear between the support block 93 and the annular airbag 3 and extending its service life.

[0040] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A glass fiber reinforced plastic ground pipe pressure test device without flange plugging, comprising: A plugging member arranged in a pipeline (1) and used to cut off the pipeline (1), characterized in that the plugging member comprises a connecting member (4) and two clamping plates (2) sleeved on the connecting member (4), the connecting member (4) is provided with a pressing member (5) for changing the distance between the two clamping plates (2), and an annular air bag (3) is provided between the two clamping plates (2); The distance between the edges of the two clamping plates (2) gradually increases from the inside to the outside, and the distance between the two clamping plates (2) decreases, so as to squeeze the annular airbag (3), increase the outer diameter of the annular airbag (3) and contact the inner wall of the pipe (1), thereby cutting off the pipe (1).

2. A flange-free fiberglass ground pipe pressure test device according to claim 1, characterized in that: The connecting member (4) is a threaded rod, the pressing member (5) is a nut sleeved on the outer wall of the threaded rod, and the two clamping plates (2) are respectively a first clamping plate and a second clamping plate, the first clamping plate is fixedly sleeved on the outer wall of the threaded rod, and the second clamping plate is slidably sleeved on the outer wall of the threaded rod.

3. A flange-free glass fiber reinforced plastic ground pipe pressure test device according to claim 2, characterized in that: A through hole (41) is provided through the end of the threaded rod, and a valve (8) is provided on the outer end of the through hole (41).

4. The FRP ground pipe pressure test device without flange blocking according to claim 1, characterized in that: The pressure testing device also includes a C-shaped stopper (6) sleeved on the edge of the end of the pipeline (1), and a bolt (7) for fixing the C-shaped stopper (6) is provided on the C-shaped stopper (6).

5. The glass fiber reinforced plastic ground pipe pressure test device without flange blocking according to claim 4, characterized in that: There are a plurality of C-shaped blocks (6), and the plurality of C-shaped blocks (6) are distributed on the pipeline (1) in a ring shape.

6. The glass fiber reinforced plastic ground pipe pressure test device without flange blocking according to claim 2, characterized in that: A support member (9) for supporting the inner side of the annular airbag (3) is provided on the side wall of the threaded rod.

7. A flange-free glass fiber reinforced plastic ground pipe pressure test device according to claim 6, characterized in that: The support member (9) comprises a sleeve (91), a screw rod (92) screwed into the sleeve (91), a gear rod (94) arranged on the inner side end of the screw rod (92), and a rack (95) slidably arranged on the sleeve (91), wherein the rack (95) is meshed with the gear rod (94) and connected to the second clamping plate.

8. The glass fiber reinforced plastic ground pipe pressure test device without flange blocking according to claim 7, characterized in that: A support block (93) is rotatably provided on the outer end of the screw rod (92).

9. A method for pressure testing a fiberglass reinforced plastic ground pipe that cannot be sealed with a flange, using a fiberglass reinforced plastic ground pipe pressure testing device that cannot be sealed with a flange as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: S1: After placing the clamping plate (2) and the annular airbag (3) into the interior of the pipe (1), the pressing member (5) is moved to reduce the distance between the two clamping plates (2), and the annular airbag (3) is squeezed to increase the outer diameter of the annular airbag (3) so that the annular airbag (3) contacts the inner wall of the pipe (1), and the pipe (1) is cut off, so that a closed test space is formed inside the pipe (1); S2: Inject water into the enclosed test space for pressure testing.

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