Stay cable dynamic and static weather resistance water tightness test device for bridge engineering

Abstract

An inhaul cable dynamic and static weather-proof water tightness test device for bridge engineering relates to the field of water tightness tests and comprises an inhaul cable, an upper anchor head, a test cylinder, a lower anchor head, an axial jack and transverse jacks, and the transverse jacks are symmetrically arranged on two sides of the lower end of the inhaul cable; a bearing frame, a sliding groove plate and a composite sliding plate assembly are sequentially installed between the test bottom and the axial jack, the sliding groove plate is fixed to the bearing frame, and a sliding groove is formed in the sliding groove plate. The composite sliding plate assembly comprises polyfluortetraethylene plate sliding blocks which are connected together, a polyfluortetraethylene plate is in sliding fit with a sliding groove of the sliding groove plate, and the sliding blocks are tightly pressed and attached to the piston end of the axial jack. Piston ends of the transverse jacks are connected with two side end surfaces of the composite sliding plate assembly; a lifting protection device is further installed on one side of the lower anchor head. The test device accords with the actual use working condition of the inhaul cable, the angle of the test device can be conveniently adjusted, reverse overturning of the test cylinder is prevented, and different test temperature requirements can be met.

Description

Technical Field

[0001] This utility model relates to the field of watertightness testing, specifically a dynamic and static weathering watertightness testing device for bridge engineering cables. Background Technology

[0002] During the daily service of cable-stayed bridges and suspension bridges, the PE sleeves of the cables or suspenders may be damaged under natural conditions such as freezing, thermal expansion and contraction, and long-term natural swaying. The waterproof sealing performance may fail, leading to corrosion of the steel wires inside the cables or suspenders. Therefore, according to JT / T 775—2016 "Parallel Wire Cables for Long-Span Cable-Stayed Bridges", dynamic and static weather resistance and water tightness tests need to be carried out during the production of finished cable bodies.

[0003] While existing technologies have enabled dynamic and static watertightness testing, they suffer from the following problems: 1. The testing equipment is difficult to adjust in angle, requiring the assistance of overhead cranes or gantry cranes. When lifted to nearly 90°, it is prone to tipping over; 2. Lateral displacement loading is achieved through lateral jacks at the upper end of the cables, but in actual operating conditions, the lateral displacement generated by the load and vibration of the lower bridge deck is the largest. The test should consider adjusting to the lower lateral displacement, which does not match the actual operating conditions; 3. Freezing and thermal expansion and contraction are important weathering factors leading to seal failure, and the test did not consider the condition of freezing and cracking. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a dynamic and static weathering watertightness testing device for bridge engineering cables, so as to solve the technical problems of existing technology where the test does not match the actual working conditions and is prone to reverse overturning.

[0005] The technical solution to the above-mentioned technical problems is: a dynamic and static weathering watertightness testing device for bridge engineering cables, comprising a cable, an upper anchor head, a test cylinder, a lower anchor head, an axial jack, and a transverse jack, wherein the transverse jacks are symmetrically arranged on both sides of the lower end of the cable; a support frame, a slide plate, and a composite sliding plate assembly are sequentially installed between the bottom of the test cylinder and the axial jack, wherein the slide plate is fixed on the support frame and has a slide groove; the composite sliding plate assembly comprises a polytetrafluoroethylene plate and a slider connected together, the polytetrafluoroethylene plate slidingly engaging with the slide groove of the slide plate, and the slider pressing tightly against the piston end of the axial jack; the piston end of the transverse jack is connected to the two end faces of the composite sliding plate assembly; a lifting and protective device for adjusting the tilt angle of the test cylinder and preventing the test cylinder from tipping over is also installed on the lower anchor head side.

[0006] A further technical solution of this utility model is: the surface of the polytetrafluoroethylene plate is provided with a grease filling groove, and the grease filling groove is filled with silicone-based grease.

[0007] A further technical solution of this utility model is as follows: the lifting and protection device includes an electric winch, a pulley, a lifting and protection bracket, and a support device. The bottom of the lifting and protection bracket is fixedly installed on a concrete base on one side of the lower anchor head of the cable. The electric winch and the pulley are respectively installed on the top of the lifting and protection bracket. The wire rope of the electric winch is fixedly connected to the upper end of the test cylinder. The lifting and protection bracket is also provided with a lateral clamp for preventing the test cylinder from tipping over. The support device is installed below the upper anchor head to support the upper end of the test cylinder.

[0008] A further technical solution of this utility model is as follows: the lifting and protective device further includes a tie rod, which is installed on one side of the lifting and protective bracket. One end of the tie rod is connected to the upper end of the lifting and protective bracket, and the other end of the tie rod is fixed to the ground. The supporting device includes support frames at multiple angles. The top of the support frame is provided with an arc-shaped groove that matches the outer wall of the test cylinder. Each support frame can either support the test cylinder independently or be connected together to support the test cylinder. An observation bracket is also installed on one side of the supporting device, and a ladder is provided on the observation bracket.

[0009] A further technical solution of this utility model is: the test cylinder includes a cylinder body with a heat insulation layer, a circulation water inlet hole at the upper end of the cylinder body, a circulation water outlet hole and a drain hole at the lower end of the cylinder body, a temperature sensor and a liquid level sensor are also installed on the cylinder body, and a fluororubber flexible sealing ring is provided at the bottom of the test cylinder.

[0010] A further technical solution of this utility model is: the insulation layer of the test cylinder is made of polyurethane foam material with a thickness of 50-80mm.

[0011] A further technical solution of this utility model is: a centering pad A, a force sensor, and a centering pad B are installed sequentially between the upper anchor head and the anchor plate. The centering pad A has a countersunk hole A in the middle that cooperates with the upper anchor head, and the centering pad B has a countersunk hole B in the middle that cooperates with the force sensor.

[0012] A further technical solution of this utility model is: a water accumulation sensor for monitoring water accumulation at the lower anchor head and a lateral displacement sensor for monitoring the lateral displacement of the cable are also installed on the support frame.

[0013] A further technical solution of this utility model is as follows: the test device further includes a watertight cooling unit, a watertight heating unit, a liquid storage tank, and a hydraulic control system; the signal input terminals of the watertight cooling unit and the watertight heating unit are respectively connected to the control system, and the watertight cooling unit and the watertight heating unit are respectively connected to the circulating water inlet and circulating water outlet of the test cylinder; the liquid storage tank includes a cryogenic liquid tank and a heating water tank, and the cryogenic liquid tank and the heating water tank are connected to the drain hole of the test cylinder; the hydraulic control system is respectively connected to the axial jack and the transverse jack through oil pipes.

[0014] A further technical solution of this utility model is: the watertight refrigeration unit adopts a compression refrigeration machine, and the watertight heating unit adopts a ceramic electric heating rod.

[0015] Due to the adoption of the above structure, the dynamic and static weather resistance and watertightness testing device for bridge engineering cables of this utility model has the following advantages compared with the prior art:

[0016] 1. It can make the test more consistent with the actual working conditions of the cable.

[0017] Since the lower part of the cable is connected to the bridge deck and bears the bridge deck load, the swing amplitude of the lower part of the cable is larger than that of the upper part. This utility model sets the lateral displacement loading jack at the lower part of the cable, which is consistent with the actual working condition where the lateral displacement generated by the lower bridge deck load and vibration is the largest, and is more in line with the actual use conditions of the cable.

[0018] In addition, since freezing and thermal expansion and contraction are important weathering factors that lead to seal failure, this utility model can achieve temperature changes from -20℃ to 70℃ by setting up a watertight cooling unit and a watertight heating unit, simulating the freezing state in winter and the hot climate conditions in summer, which is closer to the actual working conditions of bridge cables.

[0019] 2. The angle of the test apparatus can be easily adjusted to prevent the test cylinder from tipping over.

[0020] This utility model also has a lifting and protection device installed on the side of the lower anchor head. By setting this lifting and protection device, the angle of the test cylinder can be adjusted to achieve 0°-90° test angle control. It also facilitates the disassembly and assembly of the test cable and prevents the test cylinder from overturning in the opposite direction. This solves the safety problem that the dynamic and static weather resistance and water tightness test of bridge engineering cables is prone to overturning when the angle is adjusted to close to 90°.

[0021] 3. Reliable structure

[0022] (1) The composite slide assembly of this utility model includes a polytetrafluoroethylene (PTFE) plate and a slider connected as one piece, wherein the PTFE plate is located on one side of the support frame and the slider is located on the side of the axial jack. By using the PTFE plate, the friction between the slider and the support frame can be effectively reduced. In addition, the dynamic friction of the PTFE plate is further reduced by filling the grease filling groove with silicone-based grease.

[0023] (2) The composite slide plate assembly and the slide plate of this utility model are precisely matched and can withstand lateral vibration with an amplitude of at least 50mm without the risk of jamming.

[0024] (3) By reducing the friction coefficient of the composite slide plate assembly, this utility model ensures uniform force distribution and ultimately achieves tight fit and sealing between the axial jack, the transverse jack, the slide plate and the composite slide plate assembly. This solves the problem of unstable sliding and easy sealing failure caused by the high friction coefficient of the slide plate, thus enabling this application to achieve transverse loading at the lower part of the cable.

[0025] 4. Can improve cooling and heating efficiency

[0026] The fluororubber flexible sealing ring installed at the bottom of the test cylinder can maintain its elasticity at -20℃. Combined with the polyurethane foam insulation layer added to the outside of the test cylinder, the energy consumption for temperature control can be reduced by 35%, effectively improving the efficiency of cooling and heating.

[0027] 5. Can meet different test temperature requirements

[0028] This test apparatus includes a watertight cooling unit and a watertight heating unit, allowing the medium inside the test cylinder to be either coolant or hot water, thus meeting different test temperature requirements.

[0029] The technical features of a dynamic and static weathering watertightness testing device for bridge engineering cables, as described below, will be further explained with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0030] Figure 1 This is a structural schematic diagram of a dynamic and static weather resistance and watertightness testing device for bridge engineering cables, as described in this utility model.

[0031] Figure 2 This is a schematic diagram of the lower end of the cable (viewed along the axis of the test tube from the lower anchor head to the upper anchor head).

[0032] Figure 3 This is a schematic diagram of the skateboard's structure.

[0033] Figure 4 This is a schematic diagram of the liquid storage tank.

[0034] Figure 5 A schematic diagram of the existing cable watertightness testing device;

[0035] In the above figures, the reference numerals are explained as follows:

[0036] 1-Upper anchor head,

[0037] 2-Test cylinder, 201-Circulation inlet, 202-Circulation outlet, 203-Drain.

[0038] 204 - Temperature sensor, 205 - Liquid level sensor, 206 - Fluororubber flexible sealing ring.

[0039] 3-Lower anchor head, 4-Axial jack, 5-Horizontal jack

[0040] 6-Support frame, 7-Slide plate,

[0041] 8-Composite sliding plate assembly, 801-PTFE sheet, 8011-Grease filling groove, 802-Slider,

[0042] 9-Lifting safety device, 901-Tie rod, 902-Electric winch, 903-Pulley, 904-Lifting safety bracket.

[0043] 905-Concrete base, 906-Side clamping rod, 907-Supporting device, 9071-Supporting frame,

[0044] 10-Observation bracket, 11-Anchor plate, 12-Alignment plate A, 13-Force sensor, 14-Alignment plate B,

[0045] 15-Water accumulation sensor, 16-Wire-type lateral displacement sensor, 17-Watertight cooling unit, 18-Watertight heating unit.

[0046] 19-Storage tank, 1901-Refrigeration tank, 1902-Heating water tank;

[0047] F - The direction of force applied by the transverse jack of the existing cable watertightness testing device. Detailed Implementation

[0048] Example 1

[0049] A dynamic and static weathering watertightness testing device for bridge cables includes a cable, an upper anchor head 1, a test cylinder 2, a lower anchor head 3, an axial jack 4, a transverse jack 5, a lifting and protection device 9, a watertight cooling unit 17, a watertight heating unit 18, a liquid storage tank 19, and a hydraulic control system, wherein:

[0050] The test cylinder 2 includes a cylinder body with a heat insulation layer, which is made of polyurethane foam material with a thickness of 50-80mm; the upper end of the cylinder body is provided with a circulating water inlet 201, and the lower end of the cylinder body is provided with a circulating water outlet 202 and a drain hole 203 respectively. A temperature sensor 204 for controlling the temperature of the test liquid and a liquid level sensor 205 for controlling the level of the test liquid are also installed on the cylinder body. The bottom of the test cylinder 2 is provided with a fluororubber flexible sealing ring 206 for sealing.

[0051] The transverse jacks 5 are symmetrically arranged on both sides of the lower end of the cable; between the bottom of the test cylinder 2 and the axial jack 4, a support frame 6, a slide plate 7, and a composite slide assembly 8 are installed in sequence. The slide plate 7 is fixed on the support frame 6 and has a slide groove. The composite slide assembly 8 includes a polytetrafluoroethylene (PTFE) plate 801 and a slider 802 connected together. The PTFE plate 801 slides in contact with the slide groove of the slide plate 7. The thickness of the PTFE plate 801 is 10±0.5mm. The PTFE plate 801 has a grease-filled groove 8011 on the surface that mates with the slide groove of the slide plate 7. The grease-filled groove 8011 is filled with silicone-based grease. The slider 802 is pressed tightly against the piston end of the axial jack 4. The piston end of the transverse jack 5 is connected to the two end faces of the composite slide assembly 8.

[0052] The lifting and protective device 9 is installed on one side of the lower anchor head 3 to adjust the tilt angle of the test cylinder and prevent it from tipping over. The lifting and protective device 9 includes a tie rod 901, an electric winch 902, a pulley 903, a lifting and protective bracket 904, and a support device 907. The bottom of the lifting and protective bracket 904 is fixedly installed on a concrete base 905 on one side of the lower anchor head of the cable. The tie rod 901 is installed on one side of the lifting and protective bracket 904, with one end connected to the upper end of the bracket and the other end fixed to the ground. The electric winch 902 and pulley 903 are respectively installed on the top of the lifting and protective bracket 904. The wire rope of the electric winch 902 is fixedly connected to the upper end of the test cylinder 2. The lifting and protective bracket 904 is also equipped with a lateral clamping rod 906 to prevent the test cylinder 2 from tipping over. The support device 907 is installed below the upper anchor head 1 to support the upper end of the test cylinder 2.

[0053] The support device 907 includes multiple support frames 9071 at various angles, such as 45° support frames and 30° support frames. Each support frame 9071 has an arc-shaped groove at its top that mates with the outer wall of the test cylinder 2. Each support frame can either independently support the test cylinder 2 or be connected together to support it. By changing the support frames at different angles, the test cylinder can be supported to the target tilt angle. The height can be adjusted synchronously with the electric winch of the lifting and protection device, achieving stable support at any angle from 0° to 90°, thus avoiding the risk of overturning during traditional overhead crane hoisting. An observation bracket 10 is also installed on one side of the support device 907, and this observation bracket 10 is equipped with a ladder.

[0054] A centering pad A12, a force sensor 13, and a centering pad B14 are installed sequentially between the upper anchor head 1 and the anchor plate 11. The centering pad A12 has a countersunk hole A in the middle that mates with the upper anchor head, and the centering pad B14 has a countersunk hole B in the middle that mates with the force sensor 13.

[0055] A water accumulation sensor 15 for monitoring water accumulation at the lower anchor head and a lateral displacement sensor 16 for monitoring the lateral displacement of the cable are also installed on the support frame 6. The probe of the water accumulation sensor 15 is located at the connection between the lower anchor head 3 and the test cylinder 2.

[0056] The watertight refrigeration unit 17 uses a compression refrigeration machine, and the watertight heating unit 18 uses a ceramic electric heating rod. The watertight refrigeration unit 17 and the watertight heating unit 18 are respectively connected to the circulation inlet 201 and circulation outlet 202 of the test cylinder 2 through a circulation pump and circulation pipeline. The signal input terminals of the watertight refrigeration unit 17, the watertight heating unit 18, and the circulation pump are respectively connected to the signal output terminal of the control system. The liquid storage tank 19 includes a cryogenic liquid tank 1901 and a heating water tank 1902. The cryogenic liquid tank 1901 and the heating water tank 1902 are connected to the drain hole 203 of the test cylinder 2 through pipelines. The hydraulic control system is connected to the axial jack 4 and the transverse jack 5 through oil pipes. The hydraulic control system is existing technology.

[0057] The working process of this utility model is as follows:

[0058] Before installation, apply grease to the groove of the sliding plate 7. During installation, use the electric winch 902 of the lifting and protection device 9 to lower the test cylinder 2 to a horizontal position, insert the cable from the top, install the centering pad A, centering pad B, and fluororubber flexible sealing ring, install the upper anchor head and lower anchor head, and load to 0.2Fb using an axial jack; adjust the electric winch 902 to lower the test cylinder 2 to the test height, install the support device 907, add the test medium - coolant or water, adjust the temperature through the watertight cooling unit or watertight heating unit, and conduct the test according to the relevant requirements of Appendix F and Appendix G of JT / T775—2016 "Parallel Wire Cables for Long-Span Cable-Stayed Bridges"; the test should be terminated if the lower anchor head leaks water or the water accumulation sensor detects water accumulation during the test.

[0059] During operation, the temperature sensor feeds back the temperature data of the test medium inside the test cylinder 2 to the control system in real time. The control system controls the circulation pump to pump the test medium from the test cylinder 2 to the watertight cooling unit or watertight heating unit for cooling or heating. After being cooled or heated, the test medium is then pumped back into the test cylinder, forming a closed-loop temperature control cycle, so that the test medium inside the test cylinder 2 is kept between -20℃ and 70℃.

[0060] The circulation process of the test medium:

[0061] Cooling mode: Test cylinder 2 → Circulating water outlet 202 → Watertight cooling unit → Circulating water inlet 201 → Test cylinder 2;

[0062] Heating mode: Test cylinder 2 → Circulating water outlet 202 → Watertight heating unit → Circulating water inlet 201 → Test cylinder 2.

[0063] After the test is terminated, drain the test medium in the test cylinder 2 through the drain hole 203 into the coolant tank or heating water tank, place the test cylinder 2 horizontally, remove the cable and check for external cracks, and cut it open to check for internal leakage.

Claims

1. A dynamic and static weathering watertightness testing device for bridge engineering cables, comprising cables, an upper anchor head (1), a test cylinder (2), a lower anchor head (3), an axial jack (4), and a transverse jack (5), characterized in that: The transverse jacks (5) are symmetrically arranged on both sides of the lower end of the cable; between the bottom of the test cylinder (2) and the axial jack (4), a support frame (6), a slide plate (7), and a composite slide assembly (8) are installed in sequence. The slide plate (7) is fixed on the support frame (6) and has a slide groove. The composite slide assembly (8) includes a polytetrafluoroethylene plate (801) and a slider (802) connected together. The polytetrafluoroethylene plate (801) slides in cooperation with the slide groove of the slide plate (7), and the slider (802) is pressed and fitted with the piston end of the axial jack (4). The piston end of the transverse jack (5) is connected to the two end faces of the composite slide assembly (8). A lifting protection device (9) for adjusting the tilt angle of the test cylinder and preventing the test cylinder from overturning is also installed on one side of the lower anchor head (3).

2. The dynamic and static weathering watertightness testing device for bridge engineering cables according to claim 1, characterized in that: The surface of the polytetrafluoroethylene plate (801) is provided with a grease filling groove (8011), and the grease filling groove (8011) is filled with silicone-based grease.

3. The dynamic and static weathering watertightness testing device for bridge engineering cables according to claim 1, characterized in that: The lifting protection device (9) includes an electric winch (902), a pulley (903), a lifting protection bracket (904), and a support device (907). The bottom of the lifting protection bracket (904) is fixedly installed on a concrete base (905) on one side of the lower anchor head of the cable. The electric winch (902) and the pulley (903) are respectively installed on the top of the lifting protection bracket (904). The wire rope of the electric winch (902) is fixedly connected to the upper end of the test cylinder (2). The lifting protection bracket (904) is also provided with a lateral clamp (906) to prevent the test cylinder (2) from overturning in the opposite direction. The support device (907) is installed below the upper anchor head (1) to support the upper end of the test cylinder (2).

4. The dynamic and static weathering watertightness testing device for bridge engineering cables according to claim 3, characterized in that: The lifting protection device (9) also includes a pull rod (901), which is installed on one side of the lifting protection bracket (904). One end of the pull rod (901) is connected to the upper end of the lifting protection bracket (904), and the other end of the pull rod (901) is fixed to the ground. The support device (907) includes multiple angle support frames (9071). The top of the support frame (9071) is provided with an arc-shaped groove that matches the outer wall of the test cylinder (2). Each support frame can either support the test cylinder (2) independently or be connected together to support the test cylinder (2). An observation bracket (10) is also installed on one side of the support device (907), and a ladder is provided on the observation bracket (10).

5. The dynamic and static weathering watertightness testing device for bridge engineering cables according to claim 1, characterized in that: The test cylinder (2) includes a cylinder with a heat insulation layer. The upper end of the cylinder is provided with a circulating water inlet (201), and the lower end of the cylinder is provided with a circulating water outlet (202) and a drain hole (203). A temperature sensor (204) and a liquid level sensor (205) are also installed on the cylinder. A fluororubber flexible sealing ring (206) is provided at the bottom of the test cylinder (2).

6. The dynamic and static weathering watertightness testing device for bridge engineering cables according to claim 5, characterized in that: The insulation layer of the test cylinder is made of polyurethane foam with a thickness of 50-80 mm.

7. The dynamic and static weathering watertightness testing device for bridge engineering cables according to claim 1, characterized in that: A centering pad A (12), a force sensor (13), and a centering pad B (14) are installed sequentially between the upper anchor head (1) and the anchor plate (11). The centering pad A (12) has a countersunk hole A in the middle that matches the upper anchor head, and the centering pad B (14) has a countersunk hole B in the middle that matches the force sensor (13).

8. The dynamic and static weathering watertightness testing device for bridge engineering cables according to claim 1, characterized in that: A water accumulation sensor (15) for monitoring water accumulation at the lower anchor head and a lateral displacement sensor (16) for monitoring the lateral displacement of the cable are also installed on the support frame (6).

9. The dynamic and static weathering watertightness testing device for bridge engineering cables according to claim 1, characterized in that: The test apparatus also includes a watertight cooling unit (17), a watertight heating unit (18), a liquid storage tank (19), and a hydraulic control system (20); the signal input terminals of the watertight cooling unit (17) and the watertight heating unit (18) are respectively connected to the control system, and the watertight cooling unit (17) and the watertight heating unit (18) are respectively connected to the circulating water inlet (201) and the circulating water outlet (202) of the test cylinder (2); the liquid storage tank (19) includes a coolant tank (1901) and a heating water tank (1902), and the coolant tank (1901) and the heating water tank (1902) are connected to the drain hole (203) of the test cylinder (2); the hydraulic control system (20) is respectively connected to the axial jack (4) and the transverse jack (5) through oil pipes.

10. The dynamic and static weathering watertightness testing device for bridge engineering cables according to claim 9, characterized in that: The watertight refrigeration unit (17) adopts a compression refrigeration machine, and the watertight heating unit (18) adopts a ceramic electric heating rod.

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