Device and method for testing sealing performance of prestressed anchorage device

Abstract

The invention discloses a device and a method for testing the sealing performance of a prestressed anchorage device, which are used for testing the sealing of an anchorage device assembly part and comprise 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 the fastening bolt, one end of the tensioning rod is fixed to the anchorage device section through the fixing end nut, and the other end of the tensioning rod sequentially penetrates out of the prestressed pipeline section, the supporting frame and the water tank and is fixed to the outside of the water tank through the tensioning end nut. The end part of the prestressed pipeline section and the tension rod are sealed through an anchorage device assembly part sealing joint; 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] This invention belongs to the field of bridge technology, specifically relating to a testing device and method for the sealing performance of prestressed anchorages. Background Technology

[0002] Post-tensioned prestressed anchorages use smooth steel strands, which are susceptible to damage from harmful substances when embedded in concrete structures. Therefore, improving the corrosion resistance of the anchorage system is receiving increasing attention in the industry. The PL2 system (sealed anchorage system) is currently a relatively simple and effective corrosion protection method for post-tensioned prestressed concrete. The most critical issue is the sealing performance of the entire anchorage and ductwork. Verifying the sealing performance of the anchorages is crucial for designing products that meet PL2 system requirements and for producing qualified products.

[0003] Among the existing methods for testing the sealing performance of cables, CN110553798A discloses a deep-water cable simulated high water pressure environment sealing test device and its usage method, including a pressure simulation device (1) and a cable specimen (2). The pressure simulation device (1) includes a cylinder (101), a cover plate (104), and an air compressor (108); the cable specimen (2) includes an anchor cup (201), a connecting cylinder (207), and a cable body (208). The usage method of the deep-water cable simulated high water pressure environment sealing test device is characterized by the following steps: ① placing test paper; ② placing the specimen and injecting liquid; ③ inflating; ④ testing; ⑤ inspection. However, this performance testing method only applies to the cable system and does not test the sealing performance of anchor components. Furthermore, the cable specimen does not consider the sealing performance under simulated actual tension, resulting in incomplete test data.

[0004] The information disclosed in the above background section is only intended to enhance the understanding of the overall background of the present invention, and should not be construed as an admission or implication in any way that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] To address the above shortcomings, this invention provides a testing device and method for the sealing performance of prestressed anchors. This testing method simulates the actual tensioning sealing performance, solving the high sealing problem of the anchor and pipe combination, and enabling the anchor to meet the performance requirements of the anchor PL2 system.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The utility model provides a prestressed anchorage device sealing performance test device for testing the sealing of anchorage device assembly, it includes: adjustable air pressure source, fixed end nut, fastening bolt, anchorage device assembly sealing joint, support frame, water tank, tensioning end nut, tensioning rod, the anchorage device assembly includes anchorage device section and prestressed pipeline section, the support frame is placed in the water tank, the anchorage device section is fixed on the support frame through the fastening bolt, one end of the tensioning rod is fixed on the anchorage device section through the fixed end nut, the other end of the tensioning rod is in turn and passes out prestressed pipeline section, support frame, water tank and is fixed outside the water tank through the tensioning end nut, and the end of prestressed pipeline section is sealed with the tensioning rod through anchorage device assembly sealing joint, and the adjustable air pressure source is communicated with the inner chamber of anchorage device assembly.

[0008] Specifically, the prestressed pipeline section is a bamboo joint corrugated pipe, the anchorage device assembly sealing joint includes a fastener, a sealing end cover, a clamping block, and a positioning ring, the end face of the sealing end cover is sealingly connected with the end of the bamboo joint corrugated pipe, the clamping block is sleeved on the outer ring of the valley between two wave crests of the sealing end of the bamboo joint corrugated pipe, the outer wall of the clamping block is provided with a support face and a support step in the direction opposite to the sealing end cover, the positioning ring is sleeved on the outer ring of the clamping block, and the end face of the positioning ring is matched with the support step, and the fastener is used to apply a force for the relative movement of the positioning ring and the sealing end cover.

[0009] Specifically, the clamping block has a split structure and is spliced on the corresponding outer ring of the bamboo joint corrugated pipe in the circumferential direction, and the outer wall of the clamping block is provided with a fixed section in the direction of the corresponding support face, and the outer diameter of the fixed section is matched with the inner diameter of the corresponding positioning ring.

[0010] Specifically, the inner end face of the sealing end cover is provided with an annular sink, a sealing gasket is arranged in the annular sink, and the end of the bamboo joint corrugated pipe is inserted into the annular sink and sealed by the sealing gasket.

[0011] Specifically, a combined hole is arranged in the middle of the sealing end cover, the combined hole includes an internally threaded section and a tapered hole section, a sealing ring is arranged in the tapered hole section, a hollow bolt is movably arranged in the internally threaded section in the axial direction, the tensioning rod passes through the combined hole, the sealing ring, and the hollow bolt, the sealing ring is an annular tapered elastic insulator, and the sealing ring is extruded and sealed by the hollow bolt.

[0012] Specifically, a waterproof plug is arranged between the tensioning end nut and the water tank.

[0013] Specifically, a force sensor is further arranged at the end of the tensioning end nut.

[0014] A prestressed anchorage device sealing performance test method is provided, which adopts the prestressed anchorage device sealing performance test device described above and includes the following steps:

[0015] S1: install anchor assembly assembly test piece and water tank test device, support frame and anchor assembly assembly are assembled and placed in water tank, and adjustable air pressure source is communicated with the inner cavity of anchor assembly assembly test piece;

[0016] S2: the anchor assembly assembly test piece is tensioned according to preset value by using a tensioning assembly;

[0017] S3: the sealing assembly is used to seal the place where the tensioning assembly penetrates the anchor assembly assembly test piece;

[0018] S4: liquid is added in the water tank, and the adjustable air pressure source is used to input air pressure into the anchor assembly assembly test piece, and the air pressure is stopped increasing when the required pressure of the test is reached;

[0019] S5: the sealing performance of the anchor assembly assembly test piece is determined according to the pressure fluctuation.

[0020] Specifically, step S2 further comprises:

[0021] S201: a force sensor is installed at the end of the tensioning end nut;

[0022] S202: the tensioning rod is tensioned by rotating the tensioning end nut;

[0023] S203: the load value of the force sensor is read, and when the load value reaches the required value of the test, the rotation of the tensioning end nut is stopped.

[0024] Specifically, in step S3, the prestressed pipe section is a corrugated pipe, and the sealing step of the sealing assembly comprises:

[0025] S301: the orifice end face of the corrugated pipe is flattened and cut;

[0026] S302: a clamping block and a positioning ring are installed on the outer ring of the corrugated pipe, wherein the clamping block is sleeved between two wave crests of the bamboo joint corrugated pipe sealing end, and the outer wall of the clamping block is provided with a support step; the positioning ring is sleeved on the outer ring of the clamping block;

[0027] S303: the sealing end cover groove provided with a sealing gasket is matched with the orifice of the corrugated pipe;

[0028] S304: a fixing bolt is installed and penetrates the sealing end cover and the positioning ring respectively;

[0029] S305: the end of the fixing bolt is screwed with a nut to make the corrugated pipe compress the sealing gasket to deform and achieve sealing effect;

[0030] S306: the sealing ring is used to seal the place where the tensioning assembly penetrates the sealing end cover.

[0031] Compared with the prior art, the present application has the following beneficial effects:

[0032] 1. The prestressed anchorage sealing performance test device and method provided by the scheme can seal the anchoring assembly in the anchoring system, that is, the sealing performance of the cavity formed by the assembly of multiple components, and can also test the pressure resistance of the cavity formed by the anchorage and the pipeline through positive and negative pressure to simulate the working condition of actual construction, and can adjust the tensioning force during the test by using a tensioning assembly to simulate the actual post-tensioning process, and can simulate the effect of deep water test by using an adjustable air pressure source and a water tank, and the overall test effect of the anchorage in actual use is achieved.

[0033] 2. The sealing utilizes the stiffness of the prestressed pipeline wave crest, and realizes mechanical connection under the action of external force through the mortise connection of the nested clamping, so as to realize sealing performance after extrusion sealing; the clamping block needs two pieces to form a split ring structure, the clamping block is provided with a step, the high step can clamp the positioning ring to provide the axial force of the corrugated pipe during butt joint; the sealing ring is provided with a sunken table for installing a sealing gasket and N through holes, the sunken table can ensure the positioning of the sealing gasket and provide end face sealing, the N through holes provide the stiffness of the positioning and connecting parts after passing through the positioning rod; and the sealing performance of different seals can be adjusted to achieve the test of different sealing performance. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a device connection schematic diagram of the prestressed anchorage sealing performance test method.

[0035] Figure 2 It is a structure schematic diagram of the sealing assembly.

[0036] Figure 3 It is a sectional view of the sealing end cover.

[0037] Figure 4 It is a side view of the sealing end cover.

[0038] Figure 5 It is a clamping block schematic diagram.

[0039] Figure 6 It is a support frame schematic diagram.

[0040] Figure 7 It is a flow chart of the prestressed anchorage sealing performance test method.

[0041] Figure 8 It is a working flow chart of the tensioning assembly in step S2.

[0042] Figure 9 It is a sealing step flow chart of the sealing assembly in step S3.

[0043] In the figure, 1-adjustable air pressure source, 2-fixed end nut, 3-fastening bolt, 4-anchor assembly test piece, 41-anchor segment, 42-prestressed pipeline segment, 5-seal joint of anchor assembly test piece, 51-fastener, 52-seal end cover, 521-through hole, 522-internal thread segment, 523-annular counterbore, 524-taper hole segment, 53-sealing gasket, 54-clamping block, 541-fixed segment, 542-supporting step, 55-positioning ring, 56-sealing ring, 57-hollow bolt, 6-supporting frame, 61-supporting plate I, 611-U-shaped groove, 612-taper hole, 62-supporting rod, 63-supporting plate II, 631- through hole, 7-water tank, 8-waterproof plug, 9-force sensor, 10-tensioning end nut, 11-tensioning rod. DETAILED DESCRIPTION

[0044] To describe the technical contents of the present application, the purposes and effects achieved, the following will be described in combination with the embodiments and the accompanying drawings. In the description of the embodiments, it should be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments and simplifying the description, and therefore cannot be understood as limiting the devices or elements indicated to have a specific orientation, to be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application.

[0045] Embodiment 1

[0046] The present embodiment discloses a prestressed anchor sealing performance test device for testing the sealing performance of the anchor assembly 4, which mainly comprises: an adjustable air pressure source 1, a fixed end nut 2, a fastening bolt 3, a seal joint of anchor assembly 4, a supporting frame 6, a water tank 7, a tensioning end nut 10, and a tensioning rod 11.

[0047] Referring to Figure 1 , 6 , the supporting frame 6 is a main supporting member, which is connected with the anchor pad of the anchor assembly 4, and is used for fixing the anchor assembly 4 and providing a supporting load for the anchor assembly 4. The supporting frame 6 comprises a supporting plate I 61, a supporting rod 62, and a supporting plate II 63. The supporting plate I 61 is provided with a through hole or a U-shaped groove 611 and a taper hole 612. The pitch circle and the number of the through hole or the U-shaped groove are consistent with those of the mounting hole of the anchor pad. The taper of the taper hole 612 is greater than or equal to the taper of the anchor pad. The supporting rod 62 is a rod member, which connects the supporting plate I 61 and the supporting plate II 63. The supporting plate II 63 is provided with a through hole 631 for gap cooperation with the tensioning rod.

[0048] Referring to Figure 1 , the water tank 7 is used for immersing the anchor assembly 4 in water. One end surface of the water tank is provided with a through hole for gap cooperation with the tensioning rod 11, and is attached to the supporting frame 6.

[0049] Reference Figure 1 As shown in the figure, the anchorage assembly 4 is connected by the anchorage segment 41 and the prestressed pipe segment 42, and the anchorage segment 41 is fixed on the support frame 6 by the fastening bolt 3. One end of the tension rod is fixed on the anchorage segment by the fixed end nut, and the other end of the tension rod passes through the prestressed pipe segment, the support frame, the water tank in turn and is fixed outside the water tank by the tension end nut. Reference Figure 2 As shown in the figure, the end of the prestressed pipe segment and the tension rod are sealed by the anchorage assembly sealing joint. The adjustable air pressure source is in communication with the inner cavity of the anchorage assembly.

[0050] Through the test device, the tension rod and the fixed nut are respectively installed on the support frame in a tension-adjustable manner, wherein the tension nut is arranged outside the water tank, the tension force can be adjusted during the test process, the effect of dynamic test is achieved, the adjustable air pressure source is used for air pressure input in the anchorage assembly 4 after the anchorage assembly 4 is sealed, the test value is reached, and then the test result is observed, the sealing performance is detected, and the purpose of the embodiment is achieved.

[0051] As a preferred technical solution of the embodiment, the prestressed pipe segment is a bamboo joint corrugated pipe with wave crests and wave troughs. Reference Figure 2 As shown in the figure, the anchorage assembly sealing joint 5 structure, the anchorage assembly sealing joint 5 includes fastener 51, sealing end cover 52, clamping block 54 and positioning ring 55, the end face of sealing end cover 52 is sealed with the end of bamboo joint corrugated pipe; the clamping block 54 is sleeved on the outer ring of the wave trough between the two wave crests of the sealing end of the bamboo joint corrugated pipe; the outer wall of the clamping block 54 is provided with a support surface and a support step 542 opposite to the sealing end cover 52; the positioning ring 55 is sleeved on the outer ring of the clamping block 54, and the end face is matched with the support step 542; the fastener 51 is used for exerting the force of the positioning ring 55 and the sealing end cover 52 moving towards each other. By exerting the force of the positioning ring 55 and the sealing end cover 52 moving towards each other by the fastener 51, the positioning ring 55 presses the support step 542, the support step 542 is clamped at the rear end of the corresponding wave crest of the bamboo joint corrugated pipe, so as to drive the pipe opening of the corrugated pipe and the end face of the sealing end cover 52 to be pressed and sealed, and the sealing of the end of the prestressed pipe segment 42 is realized.

[0052] As a preferred embodiment of the embodiment, reference Figure 5 As shown in the figure, the clamping block 54 is a split structure and is spliced on the corresponding outer ring of the bamboo joint corrugated pipe in the circumferential direction; the outer wall of the clamping block 54 is provided with a fixed segment 541 along the corresponding support surface, and the outer diameter of the fixed segment 541 is matched with the inner diameter of the corresponding positioning ring 55. The split structure is convenient for installation in the process of bridge construction, the positioning ring 55 is sleeved on the outer ring of the fixed segment 541 of the corresponding clamping block 54, and the clamping block 54 can be fixed on the outer ring of the bamboo joint corrugated pipe.

[0053] As a preferred embodiment of the present embodiment, as shown in FIG. 2, the fastener 51 includes at least two groups of fixing bolts and nuts, and the positioning ring 55 and the sealing end cover 52 are uniformly provided with through holes 521 corresponding to the number of fixing bolts in the circumferential direction of the sealing end cover 52, and the fixing bolts pass through the corresponding through holes 521 of the positioning ring 55 and the sealing end cover 52 and are threadedly connected with the nuts. That is, the fastener 51 applies a force for the relative movement of the positioning ring 55 and the sealing end cover 52 through the threaded cooperation of the fixing bolts and the nuts; in some embodiments, threaded holes can also be directly used instead of nuts, and threaded holes are directly formed on the positioning ring 55 to achieve the effect of compression.

[0054] As a preferred embodiment of the present embodiment, as shown in FIG. 2, the fastener 51 includes at least two groups of fixing bolts and nuts, and the positioning ring 55 and the sealing end cover 52 are uniformly provided with through holes 521 corresponding to the number of fixing bolts in the circumferential direction of the sealing end cover 52, and the fixing bolts pass through the corresponding through holes 521 of the positioning ring 55 and the sealing end cover 52 and are threadedly connected with the nuts. That is, the fastener 51 applies a force for the relative movement of the positioning ring 55 and the sealing end cover 52 through the threaded cooperation of the fixing bolts and the nuts; in some embodiments, threaded holes can also be directly used instead of nuts, and threaded holes are directly formed on the positioning ring 55 to achieve the effect of compression. Figure 3 、 4 As shown in FIG. 2, the inner end face of the sealing end cover 52 is provided with an annular sink 523, the annular sink 523 is provided with a sealing gasket 53, and the end of the bamboo joint corrugated pipe is inserted into the annular sink 523 and sealed by compressing the sealing gasket 53.

[0055] As a preferred technical solution of the present embodiment, a combined hole is arranged in the sealing end cover 52, the combined 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, and the internal thread section 522 is axially movably provided with a hollow bolt 57. The tension rod 11 passes through the combined hole, the sealing ring 56 and the hollow bolt 57. The sealing ring 56 is an annular tapered elastic insulator. The sealing ring 56 is pressed and sealed by the hollow bolt 57, so as to realize the sealing between the end of the prestressed pipe section 42 and the tension rod 11.

[0056] Through the above-mentioned fastener 51 and hollow bolt 57, which are in a sealed pressure adjustable form, the performance of different seals can be adjusted, the test of different sealing performances can be achieved, and the anchorage sealing problem of the anchorage PL2 system is solved.

[0057] As a preferred technical solution of the present embodiment, a waterproof plug 8 is arranged between the tension end nut 10 and the water tank 7. The waterproof plug 8 is subjected to a sealing pressure towards the water tank 7 by tightening the tension end nut 10.

[0058] As a preferred technical solution of the present embodiment, the tension end nut 10 is further provided with a force sensor 9. When the tension end nut 10 is tightened, the current applied load value can be read from the force sensor 9, so as to achieve the effect of recording the tension value.

[0059] Embodiment 2

[0060] The present embodiment discloses a prestressed anchorage sealing performance test method, which adopts the prestressed anchorage sealing performance test device of embodiment 1. As shown in FIG. 2, the method mainly includes the following steps: Figures 7-9 ​

[0061] S1: install the anchor assembly test piece 4 and the water tank test device, wherein the water tank test device comprises a water tank 7, an adjustable air pressure source 1 and a support frame 6; the support frame 6 is a main support, the anchor assembly test piece 4 is installed on the support frame 6 and then placed in the water tank 7 as a whole, the water tank 7 is used for subsequent steps of soaking the anchor assembly test piece 4 in water, the adjustable air pressure source 1 is in communication with the inner cavity of the anchor assembly test piece 4, and the adjustable air pressure source 1 is used for air pressure input in the anchor assembly test piece 4.

[0062] S2: the anchor assembly test piece 4 is tensioned according to a preset value by using a tensioning assembly, wherein the anchor assembly test piece 4 comprises an anchor segment and a prestressed pipe segment 42, the tensioning assembly comprises a fixed end nut 2, a tensioning rod 11 and a tensioning end nut 10; the anchor segment 41 is fixed on the support frame 6 through a fastening bolt 3, one end of the tensioning rod 11 is fixed on the anchor segment 41 through the fixed end nut 10, the other end of the tensioning rod 11 passes out the prestressed pipe segment 41, the support frame 6 and the water tank 7 in sequence and is fixed outside the water tank 7 through the tensioning end nut 10, so that the tensioning force can be adjusted during the test, and the effect of simulating actual post-tensioning test is achieved.

[0063] S3: after tensioning, a sealing assembly is used to seal the place where the tensioning assembly passes out the anchor assembly test piece 4, so as to ensure the sealing performance of the inner cavity of the anchor assembly test piece 4.

[0064] S4: after the sealing treatment is completed, liquid is added in the water tank 7, the anchor assembly test piece 4 is soaked in the liquid, the adjustable air pressure source 1 is used to input air pressure in the anchor assembly test piece 4, the air pressure is stopped increasing when the required test pressure is reached, and the adjustable air pressure source 1 can comprise a pressure control valve, a pressure gauge, an air pressure pipe and an air pipe joint.

[0065] S5: whether the pressure gauge has pressure fluctuation and water seepage is observed, and the sealing performance of the anchor assembly test piece is determined according to the pressure fluctuation and water seepage of the pressure gauge.

[0066] Through the prestressed anchor sealing performance test method of the embodiment, the actual post-tensioning prestressed process is simulated by using the tensioning assembly, the tensioning force can be adjusted during the test, the effect of deep water test is simulated by using the adjustable air pressure source and the water tank, the overall test effect of the actual use of the anchor is achieved, and the purpose of the embodiment is achieved.

[0067] The tensioning work flow of the tensioning assembly is as shown in Figure 8 , and specifically includes the following steps:

[0068] S201: a force sensor 9 is installed at the end of the tensioning end nut 10;

[0069] S202: Tensioning the tension rod 11 by rotating the tensioning end nut 10;

[0070] S203: Read the load value of the force sensor 9. When the load value reaches the test requirement value, stop rotating the tensioning end nut 10.

[0071] As a preferred technical solution in this embodiment, in step S3, the prestressed pipe section 42 is a corrugated pipe with crests and troughs, such as... Figure 9 As shown, the sealing steps of the sealing assembly include:

[0072] S301: Flatten and cut the end face of the bellows opening; flattening and cutting the end face of the bellows opening is to improve the sealing performance in subsequent steps when it is used with the sealing component; when processing the opening, the cut is preferably made at the trough of the bellows.

[0073] S302: As Figure 4 , 5 As shown, a locking block 54 and a positioning ring 55 are installed on the outer ring of the bellows. The locking block 54 is fitted between two crests at the sealing end of the bellows, and the outer wall of the locking block 54 is provided with a supporting step 542. The positioning ring 55 is fitted on the outer ring of the locking block 54. By utilizing the rigidity of the crests of the prestressed bellows, after installation, the end face of the locking block 54 is engaged with the side wall of the crest.

[0074] S303: The groove of the sealing end cap containing the sealing gasket is fitted with the bellows orifice.

[0075] S304: Install fixing bolts, which pass through the sealing end cap and the positioning ring respectively;

[0076] S305: Tightening the nut at the end of the fixing bolt causes the bellows to compress and deform the sealing gasket to achieve a sealing effect.

[0077] S306: The tensioning component is sealed with a sealing ring at the point where it passes through the sealing end cap.

[0078] The sealing method of the above-mentioned sealing components utilizes the rigidity of the prestressed pipe crests and achieves mechanical connection under external force through a nested tenon joint, thereby compressing and sealing to achieve sealing performance. Two clamping blocks are required to form a separate ring structure. The clamping blocks have steps, and the higher step can hold the positioning ring, providing axial force for the bellows during docking. The sealing ring has a countersunk platform for installing the sealing gasket and N through holes. The countersunk platform can ensure the positioning of the sealing gasket and provide end face sealing, while the N through holes, after passing through the positioning rod, provide positioning and rigidity of the connection parts. Furthermore, the sealing performance can be adjusted to achieve sealing tests under different sealing performance conditions.

[0079] Although the present application has been described in detail with particular references to illustrative embodiments thereof, it should be understood that modifications and / or improvements can be made to the present application which do not depart from the spirit and scope of the present application. Accordingly, all such modifications and / or improvements are intended to be included within the scope of the present application as defined in the following claims.

Claims

1. A testing and inspection device for the sealing performance of prestressed anchorages, used to inspect the sealing of anchorage assemblies, characterized in that, include: Adjustable air pressure source, fixed end nut, fastening bolt, anchor assembly sealing joint, support frame, water tank, tensioning end nut, tensioning rod; The anchor assembly includes an anchor section and a prestressed duct section; The support frame is placed inside the water tank. The anchor section is fixed to the support frame with fastening bolts. One end of the tension rod is fixed to the anchor section with a fixed end nut. The other end of the tension rod passes through the prestressed duct section, the support frame, and the water tank in sequence and is fixed outside the water tank with a tension end nut. The end of the prestressed duct section and the tension rod are sealed with a sealing joint of the anchor assembly. The adjustable air pressure source is connected to the inner cavity of the anchor assembly.

2. The testing and inspection device for the sealing performance of prestressed anchorages according to claim 1, characterized in that: The prestressed duct section is a bamboo-joint corrugated pipe. The anchor assembly sealing joint includes fasteners, a sealing end cap, a locking block, and a positioning ring. The end face of the sealing end cap is sealed to the end of the bamboo-joint corrugated pipe. The locking block is fitted onto the outer ring of the trough between the two crests of the sealing end of the bamboo-joint corrugated pipe. The outer wall of the locking block has a supporting step with a supporting surface opposite to that of the sealing end cap. The positioning ring is fitted onto the outer ring of the locking block, and its end face mates with the supporting step. The fasteners are used to apply a force that moves the positioning ring and the sealing end cap in opposite directions.

3. The testing and inspection device for the sealing performance of prestressed anchorages according to claim 2, characterized in that: The card block has a split structure and is spliced ​​to the corresponding bamboo-joint corrugated tube outer ring along the circumferential direction; the outer wall of the card block is provided with a fixed section along the corresponding support surface, and the outer diameter of the fixed section is adapted to the inner diameter of the corresponding positioning ring.

4. The testing and inspection device for the sealing performance of prestressed anchorages according to claim 2, characterized in that: The inner end face of the sealing end cap is provided with an annular recess, and a sealing gasket is provided inside the annular recess. The end of the bamboo-joint corrugated tube is inserted into the annular recess and sealed by the sealing gasket.

5. The testing and inspection device for the sealing performance of prestressed anchorages according to claim 2, characterized in that: The sealing end cap has a combined hole in the middle, which includes an internal thread section and a tapered hole section. A sealing ring is installed on the tapered hole section, and a hollow bolt is installed on the internal thread section which can move axially. The tension rod passes through the combined hole, the sealing ring, and the hollow bolt. The sealing ring is an annular tapered elastic insulator, and the sealing ring is sealed by compression with the hollow bolt.

6. The testing and inspection device for the sealing performance of prestressed anchorages according to claim 1, characterized in that: A waterproof plug is installed between the tensioning end nut and the water tank.

7. The testing and inspection device for the sealing performance of prestressed anchorages according to claim 1, characterized in that: A force sensor is also installed at the end of the tensioning end nut.

8. A method for testing the sealing performance of prestressed anchorages, using the testing apparatus for prestressed anchorage sealing performance according to any one of claims 1-7, characterized in that, Includes the following steps: S1: Install the anchor assembly test piece and water tank test device. The support frame and anchor assembly are assembled and placed in the water tank. The adjustable air pressure source is connected to the inner cavity of the anchor assembly test piece. S2: Tension the anchor assembly specimen according to the preset value using a tensioning assembly; S3: Use a sealing assembly to seal the part of the tensioning component that passes through the anchor assembly specimen; S4: Add liquid to the water tank, and use an adjustable air pressure source to input air pressure into the anchor assembly specimen. Stop increasing the air pressure when the required test pressure is reached. S5: Determine the sealing performance of the anchor assembly specimen based on pressure fluctuations.

9. The method for testing the sealing performance of a prestressed anchorage according to claim 8, characterized in that, Step S2 also includes: S201: Install a force sensor at the end of the nut at the tensioning end; S202: Tension the tension rod by rotating the tensioning end nut; S203: Read the load value of the force sensor. When the load value reaches the test requirement value, stop rotating the tensioning end nut.

10. The method for testing the sealing performance of a prestressed anchorage according to claim 8, characterized in that, In step S3, the prestressed pipe section is a corrugated pipe, and the sealing steps of the sealing assembly include: S301: Flatten and cut the end face of the bellows opening; S302: A retaining block and a positioning ring are installed on the outer ring of the corrugated pipe, wherein the retaining block is fitted between two crests at the sealing end of the bamboo-joint corrugated pipe, and the outer wall of the retaining block is provided with a supporting step; the positioning ring is fitted on the outer ring of the retaining block; S303: The groove of the sealing end cap containing the sealing gasket is fitted with the bellows orifice; S304: Install fixing bolts, which pass through the sealing end cap and the positioning ring respectively; S305: Tightening the nut at the end of the fixing bolt causes the bellows to compress and deform the sealing gasket to achieve a sealing effect. S306: The tensioning component is sealed with a sealing ring at the point where it passes through the sealing end cap.

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