Device for testing and verifying sealing performance of spiral corrugated pipe anchorage device

Abstract

The utility model discloses a device for testing the sealing performance of a spiral corrugated pipe anchorage device. The device comprises an adjustable air pressure source, a fixed end nut, a fastening bolt, an anchorage device assembly part sealing joint, a support frame, a water tank, a tensioning end nut and a tensioning rod, the anchorage device assembly part comprises an anchorage device section and a prestressed pipeline section, the supporting frame is arranged in the water tank, the anchorage device section is fixed to the supporting frame through a fastening bolt, the anchorage device assembly part sealing joint comprises a sealing part and a sealing end cover, the end of the prestressed pipeline section is connected with the sealing end cover, one end of the tensioning rod is fixed to the anchorage device section through a fixing end nut, and the other end of the tensioning rod is connected with the sealing part. The other end of the tensioning rod sequentially penetrates out of the prestressed pipeline section, the sealing end cover, the supporting frame and the water tank and is fixed outside the water tank through a tensioning end nut. The tensioning rod and the sealing end cover are sealed through a sealing piece; and the adjustable air pressure source is communicated with the inner cavity of the anchorage device assembly part. The testing device can simulate the sealing performance of actual tensioning, solves the problem of high sealing performance of an anchorage device and a hole channel, and enables the performance of the anchorage device to meet the requirements of a PL2 system.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridges, and in particular relates to a sealing performance testing device for a spiral bellows anchor. Background Art

[0002] Post-tensioned anchors utilize smooth steel strands, which are vulnerable to harmful substances when embedded in concrete structures. Therefore, improving the corrosion resistance of anchor systems is a growing concern in the industry. The PL2 system (sealed anchor system) is currently a relatively simple and effective corrosion protection method for post-tensioned anchors. The most critical issue is the sealing performance of the entire anchor system and pipeline. Verifying the sealing performance of anchors is crucial for designing products that meet the PL2 system and producing qualified products.

[0003] Among the existing sealing performance testing devices for cables, CN110553798A discloses a deep-water cable sealing test device for simulating a high water pressure environment and a method for using the same. However, the test device is designed to pressurize water, and then use pressurized water to verify the sealing performance of the cable, mainly to prevent the influence of water on the cable, and adopts high-pressure water sealing for testing; and based on the sealing requirements for the sealing performance of the cable and the sheath pipe, the test is mainly conducted on the sealing performance of the anchor head.

[0004] However, in the post-tensioned anchor system, the airtightness of the reserved channels of the anchor is required to be airtight, and the anchor part is buried in the concrete, mainly to prevent harmful substances such as water, air, chloride ions in the external humid environment from entering the reserved channels through the anchor and related accessories, causing electrochemical reactions and damaging the prestressed tendons; while the existing technology has high requirements for the sealing of the post-tensioned anchor system, there is no device for testing the sealing performance of the anchor assembly, and the existing technology has the problem that the cable specimens do not consider the sealing of the simulated actual tensioning, resulting in incomplete test data.

[0005] The information disclosed in the above background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of implication that the information constitutes prior art already known to those skilled in the art. Utility Model Content

[0006] In view of the above shortcomings, the utility model provides a spiral bellows anchor sealing performance test device, which simulates the actual tensioning sealing, solves the high sealing problem of the anchor and pipeline combination, and enables the anchor to meet the anchor PL2 system performance requirements.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A spiral bellows anchor sealing performance test and inspection device, used to inspect the sealing of the anchor assembly, comprising: an adjustable air pressure source, a fixed end nut, a fastening bolt, an anchor assembly sealing joint, a support frame, a water tank, a tensioning end nut, and a tensioning rod; the anchor assembly comprises an anchor section and a prestressed pipe section; the support frame is placed in the water tank, and the anchor section is fixed to the support frame by a fastening bolt; the prestressed pipe section is a spiral bellows, and the anchor assembly sealing joint comprises a seal and a sealing end cover, and the end of the prestressed pipe section is connected to the sealing end cover; one end of the tensioning rod is fixed to the anchor section by a fixed end nut, and the other end of the tensioning rod passes through the prestressed pipe section, the sealing end cover, the support frame, the water tank in sequence and is fixed to the outside of the water tank by the tensioning end nut; the tensioning rod and the sealing end are sealed by a seal; the adjustable air pressure source is connected to the inner cavity of the anchor assembly.

[0009] Preferably, the inner end surface of the sealing end cover is provided with an internal thread, and the sealing end cover is connected to the prestressed pipe section through threads.

[0010] Preferably, the inner wall of the sealing end cover is a smooth surface, and the prestressed pipe section is inserted into the sealing end cover.

[0011] Specifically, the surface of the connection between the prestressed pipe section and the sealing end cover is sealed by a heat shrink sleeve.

[0012] Specifically, the sealing member includes a sealing ring and a hollow bolt. A combination hole is provided in the middle of the sealing end cover. The combination hole includes an internal thread section and a tapered hole section. The tapered hole section is used to install the sealing ring. The internal thread section can be axially moved to install the hollow bolt. The tensioning rod passes through the combination hole, the sealing ring and the hollow bolt. The sealing ring is an annular conical elastic insulator, and the sealing ring is squeezed and sealed by the hollow bolt.

[0013] Specifically, a waterproof plug is provided between the tensioning end nut and the water tank.

[0014] Specifically, a force sensor is also provided at the end of the tensioning end nut.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The test device provided in this solution mainly simulates the air tightness of the actual anchor system and the pipeline after connection. By performing air tightness tests inside the anchor, including positive and negative pressure tests, the air tightness of the anchor is verified. This solves the problem that the existing cable test mainly tests the cable to prevent the impact of pressurized water on the seal, but does not test the air tightness performance of the anchor assembly. In addition, the cable specimen does not consider the sealing performance of simulating actual tensioning, resulting in incomplete test data.

[0017] 2. This proposal provides a spiral bellows anchor sealing performance test device, which, on the one hand, mainly focuses on the sealing of the anchor assembly in the anchor system, that is, the sealing performance of the cavity formed by the assembly of multiple components between the anchor and the pipeline; on the other hand, it performs pressure resistance testing on the cavity formed by the anchor and the pipeline through positive and negative pressure to simulate the actual construction conditions. It uses tension rods, tension nuts, and fixing nuts to simulate the actual post-tensioning process. The tensioning force can be adjusted during the test to achieve the effect of a dynamic test. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of a sealing performance test device for a spiral bellows anchor according to the present invention.

[0019] Figure 2 This is a schematic diagram of the sealing joint structure of the anchor assembly of the present utility model.

[0020] Figure 3 It is a cross-sectional view of the sealing end cover of the utility model.

[0021] Figure 4 This is a schematic diagram of the support frame of the utility model.

[0022] In the figure, 1-adjustable air pressure source, 2-fixed end nut, 3-fastening bolt, 4-anchor assembly, 41-anchor section, 42-prestressed pipe section, 5-anchor assembly sealing joint, 51-seal, 52-sealing end cover, 522-inner thread section, 524-cone hole section, 53-heat shrink sleeve, 56-sealing ring, 57-hollow bolt, 6-support frame, 61-support plate I, 611-U-shaped groove, 612-cone hole, 62-support rod, 63-support plate II, 631-through hole, 7-water tank, 8-waterproof plug, 9-load sensor, 10-tensioning end nut, 11-tensioning rod. DETAILED DESCRIPTION

[0023] To explain the technical content, objectives, and effects of the present invention in detail, the following embodiments are described in conjunction with the accompanying drawings. In the description of this embodiment, it should be understood that the terms indicating orientation or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this embodiment and simplify the description. They do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0024] This embodiment discloses a spiral bellows anchor sealing performance test device, which is used to test the sealing performance of the anchor assembly 4. The device mainly includes: an adjustable air pressure source 1, a fixed end nut 2, a fastening bolt 3, an anchor assembly sealing joint 5, a support frame 6, a water tank 7, a tensioning end nut 10, and a tensioning rod 11.

[0025] refer to Figure 1-4 As shown, the support frame 6 is the primary support member, connected to the anchor pad of the anchor assembly 4. It is used to secure the anchor assembly 4 and provide load support. It comprises: support plate I 61, support rod 62, and support plate II 63. Support plate I 61 is provided with through-holes or U-shaped grooves 611 and tapered holes 612. The pitch circle and number of the through-holes or U-shaped grooves match the pitch circle and number of the mounting holes on the anchor pad. The taper of the tapered holes 612 is equal to or greater than that of the anchor pad. Support rod 62 is a rod that connects support plate I 61 and support plate II 63. Support plate II 63 is provided with through-holes 631 to provide a clearance fit with the tension rod.

[0026] refer to Figure 1 As shown, the water tank 7 is used to immerse the anchor assembly 4 in water. A through hole is provided on one end surface of the water tank, which is clearance-matched with the tension rod 11 and fits with the support frame 6.

[0027] The anchor assembly 4 is composed of an anchor section 41 and a prestressed pipe section 42 , and the anchor section 41 is fixed to the support frame 6 by fastening bolts 3 .

[0028] As the preferred technical solution of this embodiment, the prestressed pipe section 42 is a spiral corrugated pipe. Figure 2 The anchor assembly sealing joint 5 shown in the figure includes a seal 51 and a sealing end cap 52. The end of the prestressed pipe section 42 is connected to the sealing end cap 52. In this embodiment, one end of the tension rod is fixed to the anchor section via a fixed end nut, and the other end of the tension rod passes through the prestressed pipe section 42, the sealing end cap 52, the support frame 6, the water tank 7, and is fixed to the outside of the water tank via a tension end nut 10. Figure 2 As shown, the tension rod 11 passes through the sealing end cover 52 and is sealed by the sealing member 51 .

[0029] After the anchor assembly is sealed as a whole, the adjustable air pressure source is communicated with the inner cavity of the anchor assembly.

[0030] Through this test device, the tensioning rod and the fixing nut are respectively installed on the support frame in an adjustable tensioning form, wherein the tensioning nut is arranged outside the water tank, and the tensioning force can be adjusted during the test to achieve the effect of dynamic testing. After the anchor assembly 4 is sealed, an adjustable air pressure source is used to input air pressure into the anchor assembly 4. After reaching the test value, the test results can be observed and the sealing performance can be detected to achieve the purpose of this embodiment.

[0031] Among them, the sealing end cover 52 has a smooth wall surface or is provided with a thread that cooperates with the spiral bellows of the prestressed pipe section 42. The prestressed pipe section 42 and the smooth wall surface inside the sealing end cover 53 are connected and sealed through interference fit or threaded connection, which is convenient for installation and improves the sealing performance of the end area of ​​the experimental detection device.

[0032] In order to further improve the sealing performance, the surface of the connection between the prestressed pipe section 42 and the sealing end cover 52 is sealed by a heat shrink sleeve 53.

[0033] As the preferred technical solution of this embodiment, the sealing member 51 includes a sealing ring 56 and a hollow bolt 57. A combination hole is provided in the middle of the sealing end cover 52. The combination hole includes an internal thread section 522 and a tapered hole section 524. The tapered hole section 524 is provided with a sealing ring 56. The internal thread section 522 is axially movable and is provided with a hollow bolt 57. The tensioning rod 11 passes through the combination hole, the sealing ring 56 and the hollow bolt 57. The sealing ring 56 is an annular conical elastic insulator. The sealing ring 56 is squeezed and sealed by the hollow bolt 57, thereby achieving sealing between the end of the prestressed pipe section 42 and the tensioning rod 11.

[0034] Since the sealing ring 56 and the hollow bolt 57 are both of an adjustable sealing pressure type, the sealing performance of different types can be adjusted to achieve sealing tests under different sealing performances, thereby solving the sealing problem of the anchor PL2 system.

[0035] As a preferred technical solution of this embodiment, a waterproof plug 8 is provided between the tensioning end nut 10 and the water tank 7 , and sealing pressure is applied to the waterproof plug 8 toward the water tank 7 by tightening the tensioning end nut 10 .

[0036] As the preferred technical solution of this embodiment, a force sensor 9 is also provided at the end of the tensioning end nut 10. When the tensioning end nut 10 is tightened, the currently applied load value can be read from the force sensor 9, thereby achieving the effect of recording the tensioning value.

[0037] Although the present invention has been described in detail above using specific embodiments, it is readily apparent to those skilled in the art that modifications or improvements may be made to the present invention. Therefore, any such modifications or improvements that do not depart from the spirit of the present invention are intended to fall within the scope of protection claimed herein.

Claims

1. A spiral bellows anchor sealing performance test device for testing the sealing of anchor assembly parts, characterized in that: include: An adjustable air pressure source, a fixed end nut, a fastening bolt, an anchor assembly sealing joint, a support frame, a water tank, a tensioning end nut, and a tensioning rod; the anchor assembly includes an anchor section and a prestressed pipe section; the support frame is placed in the water tank, and the anchor section is fixed to the support frame by fastening bolts; the prestressed pipe section is a spiral corrugated pipe, and the anchor assembly sealing joint includes a seal and a sealing end cover, and the end of the prestressed pipe section is connected to the sealing end cover; one end of the tensioning rod is fixed to the anchor section by a fixed end nut, and the other end of the tensioning rod passes through the prestressed pipe section, the sealing end cover, the support frame, the water tank in turn and is fixed to the outside of the water tank by the tensioning end nut; the tensioning rod and the sealing end are sealed by a seal; the adjustable air pressure source is connected to the inner cavity of the anchor assembly.

2. A spiral bellows anchor sealing performance test device according to claim 1, characterized in that: The inner end surface of the sealing end cover is provided with an internal thread, and the sealing end cover is connected to the prestressed pipe section through the thread.

3. The spiral bellows anchor sealing performance test device according to claim 1, characterized in that: The inside of the sealing end cover is a smooth wall surface, and the prestressed pipe section is inserted into the sealing end cover.

4. A spiral bellows anchor sealing performance test device according to claim 2 or 3, characterized in that: The surface of the connection between the prestressed pipe section and the sealing end cover is sealed by a heat shrink sleeve.

5. The spiral bellows anchor sealing performance test device according to claim 1, characterized in that: The sealing member includes a sealing ring and a hollow bolt. A combination hole is provided in the middle of the sealing end cover. The combination hole includes an internal thread section and a tapered hole section. The tapered hole section is used to install the sealing ring. The internal thread section can be axially moved to install the hollow bolt. The tensioning rod passes through the combination hole, the sealing ring and the hollow bolt. The sealing ring is an annular conical elastic insulator. The sealing ring is squeezed and sealed by the hollow bolt.

6. The spiral bellows anchor sealing performance test device according to claim 1, characterized in that: A waterproof plug is provided between the tensioning end nut and the water tank.

7. The spiral bellows anchor sealing performance test device according to claim 1, characterized in that: A force sensor is also provided at the end of the tensioning end nut.

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