Grid reinforced thin-walled glass steel pipe water pressure test device

Abstract

The utility model discloses a grid reinforced thin -walled glass reinforced plastic pipeline hydrostatic test device, including blind plate, set up in the inner support pipe of glass reinforced plastic pipeline, be provided with glass reinforced plastic pipeline installation department and inner support pipe installation department on the blind plate, and the water injection space is formed between blind plate and inner support pipe outer wall, glass reinforced plastic pipeline inner wall, still be provided with the water injection port and pressure gauge on the blind plate, still be provided with the spacing locking mechanism of limiting blind plate axial movement on the blind plate of both ends. Through setting up blind plate and built -in support pipe in glass reinforced plastic pipeline both ends, form annular water injection space, reduce the water amount required for test greatly. The water injection port and pressure gauge on the blind plate realize pressure monitoring, and spacing locking mechanism prevents blind plate displacement under high pressure, and the sealed reliability is ensured. The structure significantly reduces water resource consumption, avoids the additional deformation influence of still water pressure to thin -walled pipeline simultaneously, solves the problem that thin -walled glass reinforced plastic pipeline is full of water after the insufficient rigidity, and deforms too much, is difficult to seal.

Description

Technical Field

[0001] This utility model relates to the field of composite material applications, and in particular to a water pressure testing device for a mesh-reinforced thin-walled fiberglass pipe. Background Technology

[0002] Grid-reinforced thin-walled fiberglass reinforced plastic (FRP) pipes are high-performance pipes manufactured using fiber winding technology. Their outer surface features an integrally formed grid-like reinforcing rib, offering advantages such as lightweight, high strength, corrosion resistance, and fatigue resistance. They are widely used in municipal water supply and drainage, marine engineering, chemical transportation, and tunnel lining. In tunnel engineering, these pipes are commonly used for secondary lining of shield tunnels, lining of water conveyance tunnels, and permanent support structures under corrosive geological conditions. Because the mechanical properties of large-diameter (DN≥800mm) grid-reinforced thin-walled FRP pipes are crucial under high-pressure conditions, rigorous hydrostatic testing is required to verify their pressure-bearing capacity, sealing performance, and structural stability.

[0003] However, existing methods for hydrostatic testing of large-diameter, mesh-reinforced thin-walled fiberglass pipes have the following main drawbacks: 1. High water consumption, high testing costs, and environmental unfriendliness. Traditional hydrostatic testing requires filling the pipe with water to establish test pressure. For large-diameter pipes (such as DN1200 and above), the required water volume is extremely large (tens of cubic meters in a single test), which not only wastes water resources but also increases testing costs. 2. After the thin-walled fiberglass pipe is filled with water, the excessive water volume and weight lead to insufficient rigidity and excessive deformation of the pipe, which in turn prevents the pipe from sealing properly at both ends. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a water pressure testing device for a mesh-reinforced thin-walled fiberglass pipe.

[0005] This utility model provides a hydrostatic testing device for a mesh-reinforced thin-walled fiberglass pipe, which adopts the following technical solution:

[0006] A hydrostatic testing device for a mesh-reinforced thin-walled fiberglass pipe includes blind plates installed at both axial ends of the fiberglass pipe and an inner support pipe installed inside the fiberglass pipe. The blind plates are provided with fiberglass pipe installation parts and inner support pipe installation parts. A water injection space is formed between the blind plates, the outer wall of the inner support pipe, and the inner wall of the fiberglass pipe. The blind plates are also provided with water injection ports and pressure gauges. Limiting locking mechanisms that restrict the axial movement of the blind plates are also provided at both ends of the blind plates.

[0007] Through the above technical solution, this device forms an annular water injection space by installing blind flanges and built-in support pipes at both ends of the fiberglass pipe, significantly reducing the amount of water required for the test. Water inlets and pressure gauges on the blind flanges enable pressure monitoring, while a limiting and locking mechanism prevents displacement of the blind flanges under high pressure, ensuring reliable sealing. Compared to traditional full-pipe water injection methods, this structure significantly reduces water consumption and solves the problem of insufficient rigidity and excessive deformation of thin-walled fiberglass pipes due to excessive water filling, which in turn leads to the inability to seal at both ends of the thin-walled fiberglass pipe.

[0008] As a preferred embodiment of this utility model, the limiting and locking mechanism includes a bolt rod, which passes through two blind plates and is locked by a locking nut.

[0009] The above technical solution involves a bolt penetrating the double blind flange and securing it with a lock nut, forming a stable axial restraint structure. This mechanical locking method effectively resists the axial thrust generated by water pressure, preventing the blind flange from loosening or leaking. Compared to welding or bolted flange connections, this design facilitates assembly and disassembly and is suitable for testing pipelines of different lengths.

[0010] As a preferred embodiment of this invention, at least two bolts are provided, and the two bolts are arranged symmetrically.

[0011] The above technical solution ensures that the symmetrically arranged double bolts distribute the force evenly on the blind flange, avoiding the misalignment problem caused by unilateral locking. The two bolts are symmetrically distributed along the pipeline axis, ensuring the blind flange remains parallel under high pressure, improving the sealing ring's fit stability, and reducing the risk of leakage.

[0012] As a preferred embodiment of this invention, a sealing gasket is also provided between the bolt rod and the blind plate.

[0013] The above technical solution uses a sealing gasket placed between the plug rod and the blind flange to prevent high-pressure water from leaking along the axial direction of the plug rod. This structure compensates for machining tolerances, ensures a tight fit between the blind flange and the pipe end face, improves overall sealing performance, and is suitable for testing requirements of different pressure levels.

[0014] As a preferred embodiment of this invention, the sealing gasket is a conical sealing gasket.

[0015] Through the above technical solution, the conical sealing gasket expands radially under the action of the locking nut, forming a tighter sealing contact with the blind flange bore wall. This design enhances sealing reliability, is particularly suitable for high-pressure conditions, and reduces leakage problems caused by pressure fluctuations.

[0016] As a preferred embodiment of this invention, the inner support tube is further provided with a support member inside.

[0017] The above technical solution enhances the structural rigidity of the internal support components of the inner support pipe, preventing deformation caused by high-pressure water. This design ensures that the annular water injection space remains uniform, avoiding impact on testing accuracy or damage to the inner wall of the pipe due to support pipe collapse.

[0018] As a preferred embodiment of this utility model, it further includes a support bracket, which includes an arc-shaped support plate, the arc-shaped surface of which contacts the fiberglass pipe.

[0019] The above technical solution uses an arc-shaped support plate that fits snugly against the outer wall of the fiberglass pipe, providing stable support and preventing the pipe from rolling or shifting during testing. This structure is adaptable to different pipe diameters, ensuring uniform stress on the pipe during testing and reducing the impact of external interference on the test results.

[0020] As a preferred embodiment of this utility model, the fiberglass pipe installation part includes an annular groove, the fiberglass pipe is inserted into the annular groove, and a sealing ring is also provided on the inner wall of the annular groove.

[0021] The above technical solution utilizes a ring-shaped groove in the fiberglass pipe installation section, combined with a sealing ring, to achieve a reliable seal at the pipe end. This structure facilitates rapid installation while ensuring no leakage under high pressure, making it suitable for testing requirements involving repeated disassembly and reassembly.

[0022] As a preferred embodiment of the present invention, the inner support tube mounting part includes an annular groove, the inner support tube is inserted into the annular groove, and a sealing ring is also provided on the inner wall of the annular groove.

[0023] Through the above technical solution, the annular groove of the inner support pipe installation part cooperates with the sealing ring to ensure the sealing between the support pipe and the blind flange. This design prevents high-pressure water from seeping into the interior of the support pipe, while allowing slight displacement of the support pipe when the temperature changes, thus avoiding structural stress concentration.

[0024] In summary, this utility model has at least one of the following beneficial technical effects:

[0025] This utility model's mesh-reinforced thin-walled fiberglass pipe hydrostatic testing device creates an annular water injection space by installing blind flanges and built-in support pipes at both ends of the fiberglass pipe, significantly reducing the water volume required for the test. Water inlets and pressure gauges on the blind flanges enable pressure monitoring, while a limiting and locking mechanism prevents displacement of the blind flanges under high pressure, ensuring reliable sealing. Compared to traditional full-pipe water injection methods, this structure significantly reduces water consumption and solves the problem of insufficient rigidity and excessive deformation of the thin-walled fiberglass pipe due to excessive water filling, which in turn leads to the inability to seal at both ends of the thin-walled fiberglass pipe.

[0026] 2. Rigid support is provided by the internal support tube, effectively suppressing pipeline deformation under pressure and ensuring pipeline structural stability during testing. Limiting and locking mechanisms (such as bolts and lock nuts) prevent axial displacement of the blind flange, while sealing gaskets and annular groove structures ensure reliable sealing at all connections, preventing leakage. Support brackets further stabilize the pipeline position and reduce external interference. This design not only improves the accuracy of test data but also prevents pipeline damage caused by testing, extending its service life. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the water pressure testing device for the mesh-reinforced thin-walled fiberglass pipe of this utility model.

[0028] Figure 2 yes Figure 1 Enlarged view of part A.

[0029] Figure 3 This is a side view of the support bracket of this utility model.

[0030] Explanation of reference numerals in the attached drawings: 1. Fiberglass pipe; 2. Blind flange; 3. Inner support pipe; 4. Fiberglass pipe installation part; 5. Inner support pipe installation part; 6. Water inlet; 7. Pressure gauge; 8. Bolt rod; 9. Sealing gasket; 10. Support component; 11. Arc-shaped support plate; 12. Sealing ring; 13. Locking nut. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-3 The present invention will be described in further detail below.

[0032] Example 1:

[0033] Reference Figures 1 to 2 This embodiment discloses a hydrostatic testing device for a mesh-reinforced thin-walled fiberglass pipe, including blind plates 2 for installation at both axial ends of a fiberglass pipe 1 and an inner support pipe 3 installed inside the fiberglass pipe 1. In this embodiment, the metal inner support pipe 3 is made of steel pipe. A fiberglass pipe mounting part 4 and an inner support pipe mounting part 5 are provided on the blind plates 2. In this embodiment, the fiberglass pipe mounting part 4 includes an annular groove. Both ends of the fiberglass pipe 1 are respectively inserted into the annular groove on the blind plate 2, thus fixing the fiberglass pipe 1 to the blind plate 2. A sealing ring 12 is also provided on the inner wall of the annular groove to ensure the sealing between the fiberglass pipe 1 and the blind plate 2.

[0034] In this embodiment, the inner support tube mounting part 5 includes an annular groove, and the inner support tube 3 is inserted into the annular groove. A sealing ring 12 is also provided on the inner wall of the annular groove. The inner support tube 3 and the blind plate 2 can be fixedly connected through the inner support tube mounting part, and the sealing ring 12 can ensure the sealing between the inner support tube 3 and the blind plate 2.

[0035] A water injection space is formed between the blind flange 2 and the outer wall of the inner support pipe 3 and the inner wall of the fiberglass pipe 1. A water injection port 6 and a pressure gauge 7 are also provided on the blind flange 2. A limiting locking mechanism is also provided on the blind flange 2 at both ends to restrict the axial movement of the blind flange 2. The limiting locking mechanism ensures the stable connection between the blind flange 2 and the inner support pipe 3 and the fiberglass pipe 1, and prevents the blind flange 2 from shifting between the inner support pipe 3 and the fiberglass pipe 1 due to pressure during the pressure test, which could lead to water leakage.

[0036] In this embodiment, the limiting and locking mechanism includes bolts 8, with corresponding openings on the blind holes 2. The bolts 8 pass through the openings on the two blind plates 2 and are locked by locking nuts 13. At least two bolts 8 are provided, symmetrically arranged. By connecting the blind plates 2 at both ends with the bolts 8, and locking the bolts 8 with the locking nuts 13, a pulling force is applied to the two blind plates 2 in opposite directions, thereby tightening the two blind plates 2 and ensuring a tight fit between the blind plates 2 and the fiberglass pipe 1 and the inner support pipe 3. To ensure a tight seal between the bolts 8 and the openings on the blind plates 2, a sealing gasket 9 is also provided between the bolts 8 and the blind plates 2 in this embodiment. In this embodiment, the sealing gasket 9 is a conical sealing gasket. When the locking nuts 13 are tightened, the conical sealing gasket is subjected to pressure towards the center of the fiberglass pipe 1, making the conical sealing gasket fit tightly against the openings on the blind holes 2, thus improving the sealing performance.

[0037] To prevent the inner support pipe 3 from deforming due to water pressure, a support member 10 is also provided inside the inner support pipe 3. Multiple support members 10 are provided and distributed along the axial direction of the inner support pipe 3. The strength of the inner support pipe 3 is ensured by multiple support members 10.

[0038] Reference Figure 1 and Figure 3 The water pressure testing device for the grid-reinforced thin-walled fiberglass pipe in this embodiment also includes a support bracket, which includes an arc-shaped support plate 11. The arc-shaped surface of the arc-shaped support plate 11 contacts the fiberglass pipe 1 and is used to support the fiberglass pipe 1.

[0039] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A hydrostatic testing device for a mesh-reinforced thin-walled fiberglass pipe, characterized in that: It includes blind plates (2) for setting at both ends of the fiberglass pipe (1) and an inner support pipe (3) set inside the fiberglass pipe (1). A fiberglass pipe mounting part (4) and an inner support pipe mounting part (5) are provided on the blind plate (2). A water injection space is formed between the blind plate (2), the outer wall of the inner support pipe (3), and the inner wall of the fiberglass pipe (1). A water injection port (6) and a pressure gauge (7) are also provided on the blind plate (2). A limiting locking mechanism for restricting the axial movement of the blind plate (2) is also provided on the blind plates (2) at both ends.

2. The water pressure testing device for mesh-reinforced thin-walled fiberglass pipes according to claim 1, characterized in that: The limiting locking mechanism includes a bolt (8), which passes through two blind plates (2) and is locked by a locking nut (13).

3. The water pressure testing device for mesh-reinforced thin-walled fiberglass pipes according to claim 2, characterized in that: At least two bolts (8) are provided, and the two bolts (8) are arranged symmetrically.

4. The water pressure testing device for mesh-reinforced thin-walled fiberglass pipes according to claim 2, characterized in that: A sealing gasket (9) is also provided between the bolt (8) and the blind plate (2).

5. The water pressure testing device for mesh-reinforced thin-walled fiberglass pipes according to claim 4, characterized in that: The sealing gasket (9) is a conical sealing gasket.

6. The water pressure testing device for mesh-reinforced thin-walled fiberglass pipes according to claim 1, characterized in that: The inner support tube (3) is also provided with a support member (10).

7. The water pressure testing device for mesh-reinforced thin-walled fiberglass pipes according to claim 1, characterized in that: It also includes a support bracket, which includes an arc-shaped support plate (11), the arc-shaped surface of which contacts the fiberglass pipe (1).

8. The water pressure testing device for a mesh-reinforced thin-walled fiberglass pipe according to claim 1, characterized in that: The fiberglass pipe installation part (4) includes an annular groove, the fiberglass pipe (1) is inserted into the annular groove, and a sealing ring (12) is also provided on the inner wall of the annular groove.

9. The water pressure testing device for a mesh-reinforced thin-walled fiberglass pipe according to claim 1, characterized in that: The inner support tube mounting part (5) includes an annular groove, the inner support tube (3) is inserted into the annular groove, and a sealing ring (12) is also provided on the inner wall of the annular groove.

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