Segment joint mechanics and waterproof performance test device and method

Abstract

The invention relates to the field of segment model joint test, and discloses a segment joint mechanics and waterproof performance test device and method.The segment joint mechanics and waterproof performance test device comprises a support, movable seats are symmetrically arranged on the two sides of the support, and rotatable supporting blocks are installed at the tops of the movable seats on the two sides; the number of the duct piece models is two, the far sides of the two duct piece models make contact with the supporting blocks on the two sides correspondingly, and the close sides of the two duct piece models abut against each other to form a joint; the arc-shaped steel plate is in contact with the outer wall of the segment model; and the steel tank wraps the joint, and a water inlet hole and a water outlet hole are formed in the top of the steel tank. According to the method, after the pipe piece models on the two sides form the joint, the joint is sealed through the steel tank, water acts on the joint area through water adding and pressurization, then the test of water leakage under the pipe piece model joint opening and slab staggering deformation state is simulated, and the problem that in the prior art, test means are lacked is solved.

Description

Technical Field

[0001] The present invention relates to the field of pipe segment model joint testing, and in particular to a pipe segment joint mechanical and waterproof performance testing device and method. Background Art

[0002] The shield method has the advantages of safe construction, fast excavation speed, strong adaptability to complex strata, small surface settlement and little impact on the surrounding environment. It has become the main construction method for building urban subway interval tunnels and underwater railway and highway tunnels crossing large rivers and seas.

[0003] However, the opening and misalignment of segment model joints can lead to waterproofing failure and water leakage. Long-term leakage can accelerate steel corrosion, concrete deterioration, and even cause structural settlement or local damage. Clarifying the relationship between water leakage and joint deformation can optimize segment model design, assembly processes, and waterproofing measures, extending the tunnel's service life.

[0004] However, in the existing technology, the waterproof performance of the segment model joints in the existing shield tunnel construction has attracted certain attention. However, the existing technology mainly focuses on the design and research of the waterproof materials and joint sealing structures of the overall segment model, and lacks a systematic test method for the impact of the opening and misalignment deformation of the segment model joints on water leakage. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides a device and method for testing the mechanical and waterproof performance of pipe segment joints, which solves the problem in the existing technology of the lack of a systematic testing device for the impact of pipe segment model joint opening and misalignment deformation on water leakage.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a segment joint mechanical and waterproof performance testing device, comprising:

[0007] The support has movable seats symmetrically arranged on both sides, and rotatable support blocks are installed on the tops of the movable seats on both sides;

[0008] Two segment models are provided, and the distal sides of the two segment models are in contact with the support blocks on both sides respectively, and the proximal sides of the two segment models abut against each other to form a joint;

[0009] A curved steel plate in contact with the outer wall of the segment model;

[0010] The steel trough is located outside the segment model and wraps the joints. A water inlet hole and a drainage hole are provided on the top of the steel trough for water intake and drainage respectively.

[0011] Preferably, hydraulic cylinders are installed on both sides of the inner wall of the support, and the output ends of the hydraulic cylinders on both sides are in contact with the far sides of the movable seats on both sides respectively.

[0012] Preferably, a slide rail is provided in the middle of the support, and the slide rail is slidably connected to the movable seat.

[0013] Preferably, the top surface and the bottom surface of the outer wall of the segment model are both provided with connecting pieces, the two connecting pieces are connected by fastening bolts, and the outer wall of the connecting piece is in contact with the outer wall of the arc-shaped steel plate.

[0014] Preferably, wooden wedges are provided at the joints between the two segment models.

[0015] Preferably, waterproof glue is provided between the steel trough and the segment model.

[0016] A method for testing the mechanical and waterproof properties of pipe segment joints, comprising the following steps:

[0017] a. Splice the segment models. Place the two segment models on opposite sides and contact the support blocks on both sides. Place curved steel plates on the top and bottom surfaces of the outer walls of the two segment models. Then install connectors on the outside of the curved steel plates. Finally, use fastening bolts to penetrate the connectors.

[0018] b. Then drive the hydraulic cylinder to drive the movable base to move the two segment models closer to each other;

[0019] c. By turning the nut on one side of the fastening bolt, the pressure of the two curved steel plates on the segment models on both sides is different, thereby causing the segment models on both sides to be offset along the joint;

[0020] d. Insert wooden wedges into the joints of the segment models on both sides;

[0021] e. Place the steel trough outside the joint of the concrete segment model and seal the joint. Then inject waterproof adhesive to bond the steel trough to the surface of the segment model. Finally, bolt the steel trough to the outer wall of the segment model.

[0022] f. Use a pressure pump to inject water into the water inlet hole on the top surface of the steel trough. When water flows out of the steel trough drain hole, seal the drain hole. Then gradually increase the pressure in the steel trough. At the same time, check whether there is leakage at the joints of the segment model and record the side penetration height at the joints of the segment model until the pressure is increased to the point where obvious water leakage appears at the joints of the segment model. Record the leakage status and location.

[0023] Preferably, in step f, the stepwise pressurization comprises:

[0024] First, pressurize to 0.19-1.21MPa at a rate of 0.04-0.06 MPa / min, and maintain the pressure for 9.5-10.5 minutes.

[0025] The pressure then increases by 0.19-1.21 MPa at each stage, and each pressurization lasts for 9.5-10.5 minutes.

[0026] The present invention provides a device and method for testing the mechanical and waterproof properties of pipe segment joints. It has the following beneficial effects:

[0027] 1. The present invention forms a joint by bringing the two side segment models into contact with each other, then uses a steel trough provided with a water inlet and a drain to seal the joint, and applies water pressure to the joint area by adding water and applying pressure, thereby establishing a water leakage test method that can systematically simulate the segment model joint opening and misalignment deformation states, solving the problem in the prior art of lacking a systematic test method for the effect of joint deformation on water leakage.

[0028] 2. By inserting wooden wedges of different sizes into the joints of the segment model, the present invention can flexibly adjust the opening of the joints and accurately simulate the joint opening state under different deformation amplitudes in actual engineering. This makes the test process more in line with the tunnel operating conditions and improves the representativeness and applicability of the test data.

[0029] 3. The present invention ensures the stability of the loading process by adopting a method of slowly increasing pressure and maintaining it for a fixed time at each pressure level. It can fully expose tiny leaks at the joints under the action of stable water pressure, significantly improving the sensitivity and accuracy of water leakage monitoring. In addition, the gradually increasing loading mode can realize a systematic evaluation of the waterproof performance of the joints under different pressure levels, facilitating a comprehensive analysis of the leakage evolution of the joints under low, medium and high pressure conditions, thereby providing continuous and reliable performance curve data support for the joint design and waterproof optimization of shield tunnel segment models. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0031] Figure 2 It is a structural schematic diagram of the support portion of the present invention;

[0032] Figure 3 It is a schematic diagram of the structure of the connecting piece of the present invention;

[0033] Figure 4 It is a front cross-sectional view of the steel channel of the present invention;

[0034] Figure 5 for Figure 4 A magnified view of point A in the figure;

[0035] Figure 6 This is a schematic diagram of the structure of the wooden wedge portion of the present invention;

[0036] Figure 7 It is a schematic diagram of the structure of the steel trough part of the present invention.

[0037] Among them, 1. Moving seat; 2. Support block; 3. Hydraulic cylinder; 4. Slide rail; 5. Segment model; 6. Fastening bolts; 7. Connectors; 8. Arc-shaped steel plate; 9. Steel trough; 10. Waterproof adhesive; 11. Wooden wedge; 12. Support. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the specification of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0039] In order to better understand the present invention, the above contents are described in detail below in conjunction with specific embodiments.

[0040] Please see the attached Figure 1 -Attached Figure 7 An embodiment of the present invention provides a test device for the mechanical and waterproof performance of pipe segment joints, comprising: a support 12, on both sides of which movable seats 1 are symmetrically arranged, and the tops of the movable seats 1 on both sides are installed with rotatable support blocks 2; two pipe segment models 5 are provided, and the far sides of the two pipe segment models 5 are respectively in contact with the support blocks 2 on both sides, and the close sides of the two pipe segment models 5 are abutted to form a joint; an arc-shaped steel plate 8, which is in contact with the outer wall of the pipe segment model 5; a steel trough 9, which is located outside the pipe segment model 5 and wraps the joint, and the top of the steel trough 9 is provided with a water inlet hole and a drainage hole for water intake and drainage respectively.

[0041] In this embodiment, the movable seat 1 can be supported by the support 12. When the adjacent sides of the pipe segment models 5 on both sides contact each other, a joint will be formed. At this time, the steel trough 9 can be used to seal the joint. At the same time, the steel trough 9 is also provided with a water inlet hole and a drain port. Therefore, when testing, water can be added to the steel trough 9 through the water inlet hole, and then water can enter the joint, thereby conducting a test on the joint mechanics and waterproof performance of the pipe segment model 5.

[0042] Please see the attached Figure 2 Hydraulic cylinders 3 are installed on both sides of the inner wall of the support 12, and the output ends of the hydraulic cylinders 3 on both sides are in contact with the far sides of the moving base 1 on both sides. A slide rail 4 is provided in the middle of the support 12, and the slide rail 4 is slidably connected to the moving base 1.

[0043] In this embodiment, the hydraulic cylinder 3 can push the movable base 1 to move, thereby driving the segment models 5 on both sides to approach each other, and the sliding rail 4 can guide the moving direction of the movable base 1.

[0044] Please see the attached Figure 1 、 Figure 3 、 Figure 4 and Figure 5 The top and bottom surfaces of the outer walls of the segment models 5 are both equipped with connectors 7. The two connectors 7 are connected by fastening bolts 6, and the outer walls of the connectors 7 contact the outer walls of the curved steel plates 8. Wooden wedges 11 are installed at the joint between the two segment models 5. Waterproof adhesive 10 is installed between the steel troughs 9 and the segment models 5.

[0045] In this embodiment, connecting parts 7 are provided on the top and bottom surfaces of the segment model 5, and the two connecting parts 7 are connected by fastening bolts 6, so that the arc-shaped steel plate 8 can clamp the segment model 5. At the same time, the supporting force of the arc-shaped steel plate 8 on the segment model 5 can be adjusted by adjusting the nuts on the fastening bolts 6. By adjusting the nuts on the fastening bolts 6 outside the two segment models 5, the extrusion force on the two segment models 5 can be different, thereby forming an uneven stress state at the joint, causing the segment model 5 on one side to be displaced relative to the segment model 5 on the other side along the joint direction, thereby forming a misalignment amount. By controlling the tightening degree of the nuts on the fastening bolts 6, the misalignment amount can be accurately adjusted to simulate the misalignment deformation phenomenon that may occur at the joint of the shield tunnel segment model 5 under different working conditions.

[0046] Working principle: When using:

[0047] First, the segment models 5 are spliced ​​together. After the two segment models 5 are placed at the far sides and in contact with the support blocks 2 on both sides, arc-shaped steel plates 8 are placed on the top and bottom surfaces of the outer walls of the two segment models 5. Then, connectors 7 are installed on the outside of the arc-shaped steel plates 8. Finally, fastening bolts 6 are used to penetrate the connectors 7, and the adjacent sides of the segment models 5 on both sides abut against each other to form a joint. Then, by starting the hydraulic cylinders 3 on both sides, the movable bases on both sides are driven to move toward the middle direction, thereby causing the two segment models 5 to gradually move closer together. Subsequently, connectors 7 are set on both sides of the outer wall of the arc-shaped steel plates 8, and the two connectors 7 on the top and bottom surfaces of the segment model 5 are connected to each other by fastening bolts 6. Then, by loosening or tightening the nuts on one side of the fastening bolts 6, the arc-shaped steel plates 8 on both sides apply different pressures to the segment models 5 on both sides, thereby causing the two segment models 5 to produce axial misalignment displacement at the joint, realizing the set misalignment simulation.

[0048] Then, a wooden wedge 11 is inserted into the joint of the two segment models 5. At this time, the thickness of the wooden wedge 11 is changed to simulate different degrees of joint opening, thereby completing the setting of the opening deformation state;

[0049] After the wooden wedges 11 are inserted, the steel channel 9 is placed outside the joint of the segment model 5. The steel channel 9 is sealed and bonded to the outer surface of the curved steel plate 8 using waterproof adhesive 10. Then, bolts are inserted through the bottom of the steel channel 9 and the nuts are tightened. At this point, the steel channel 9 can be fixed to the outer wall of the segment model 5, thus forming a reliable sealed cavity.

[0050] Then, a pressure pump is connected to the water inlet hole on the top surface of the steel tank 9 through a water inlet pipe to start injecting water into the sealed cavity. When water flows out of the drain port, the drain hole is immediately sealed. At this time, the cavity is initially filled with water. Subsequently, a graded pressurization method is used to gradually pressurize the interior of the steel tank 9. Each level of pressurization is maintained for a period of time. Under the stable pressure state, the joints of the segment model 5 are checked for leakage. At the same time, the penetration height of the joint side and the leakage location and status data are recorded.

[0051] The pressure is continuously applied until obvious water leakage occurs at the joints of the segment model 5, and finally the waterproof performance test results of the joints of the segment model 5 are obtained.

[0052] This embodiment also provides a method for testing the mechanical and waterproof properties of the joints of a segment model 5 based on the above-mentioned device, comprising the following steps:

[0053] a. Splice the segment models 5. After placing the two segment models 5 on opposite sides and contacting the support blocks 2 on both sides, place curved steel plates 8 on the top and bottom surfaces of the outer walls of the two segment models 5. Then, install connectors 7 on the outside of the curved steel plates 8. Finally, fasten bolts 6 through the connectors 7.

[0054] b. Then drive the hydraulic cylinder 3 to move the mobile base so that the two segment models 5 are close to each other;

[0055] c. By turning the nut on one side of the fastening bolt 6, the pressure of the two curved steel plates 8 on the two side segment models 5 is different, thereby causing the two side segment models 5 to be offset along the joint;

[0056] d. Insert the wooden wedges 11 into the joints of the segment models 5 on both sides;

[0057] e. Place the steel trough 9 outside the joint of the concrete segment model 5 and seal the joint with the steel trough 9. Then inject the waterproof adhesive 10 to bond the steel trough 9 to the surface of the segment model 5. Finally, bolt the steel trough 9 to the outer wall of the segment model 5.

[0058] f. Use a pressure pump to inject water into the water inlet hole on the top surface of the steel trough 9. When water flows out of the drain outlet of the steel trough 9, seal the drain hole. Then gradually increase the pressure inside the steel trough 9. At the same time, check whether there is any leakage at the joints of the segment model 5 and record the side seepage height at the joints of the segment model 5 until the pressure is increased to the point where obvious water leakage appears at the joints of the segment model 5. Record the leakage status and location.

[0059] In step f, the stepwise pressurization includes:

[0060] First, pressurize to 0.19-1.21MPa at a rate of 0.04-0.06 MPa / min, and maintain the pressure for 9.5-10.5 minutes.

[0061] The pressure then increases by 0.19-1.21 MPa at each stage, and each pressurization lasts for 9.5-10.5 minutes.

[0062] In this embodiment: First, step-by-step pressurization can effectively simulate the stress state of the joints caused by the gradual changes in soil pressure and water pressure during actual tunnel use, avoiding local damage to the joints or abnormal leakage caused by a large one-time pressurization, thereby making the test results more representative of actual engineering practice;

[0063] By slowly increasing the pressure and maintaining it for a certain period of time at each pressure level, for example: first pressurizing to 0.2MPa at a rate of 0.05MPa / min, maintaining the pressure for 10 minutes, and then increasing by 0.2MPa at each level, and each pressurization lasting for 10 minutes; not only does it ensure the stability of the pressure loading process, but it also allows small leaks at the joints to be fully exposed under stable loading conditions, which helps to improve the sensitivity and accuracy of water leakage monitoring.

[0064] Secondly, the gradually increasing loading mode can achieve a systematic evaluation of the waterproof performance of joints under different pressure levels, facilitating the analysis of the evolution of joint leakage under low, medium and high pressure conditions, thereby providing detailed and continuous performance curve data support for tunnel structure design.

[0065] Finally, maintaining pressurization in stages for a sufficient time helps to observe the long-term pressure resistance of the joint sealing system, better evaluate the long-term effects of the waterproof adhesive 10, steel groove 9 sealing measures, and misalignment and opening deformation on the waterproof performance, and improve the reliability of the test results and their application guidance value.

[0066] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A test device for the mechanical and waterproof performance of pipe segment joints, characterized in that: include: A support (12) having movable seats (1) symmetrically arranged on both sides thereof, and rotatable support blocks (2) are installed on the tops of the movable seats (1) on both sides; Two segment models (5) are provided, and the far sides of the two segment models (5) are in contact with the support blocks (2) on both sides respectively, and the close sides of the two segment models (5) are in contact with each other to form a joint; A curved steel plate (8) in contact with the outer wall of the segment model (5); A steel trough (9) is located outside the segment model (5) and wraps around the joint. A water inlet hole and a drainage hole are provided on the top of the steel trough (9) for water inlet and drainage, respectively; A slide rail (4) is provided in the middle of the support (12), and the slide rail (4) is slidably connected to the movable seat (1); Connectors (7) are provided on the top and bottom surfaces of the outer wall of the segment model (5), the two connectors (7) are connected by fastening bolts (6), and the outer walls of the connectors (7) are in contact with the outer wall of the arc-shaped steel plate (8).

2. A segment joint mechanical and waterproof performance testing device according to claim 1, characterized in that: Hydraulic cylinders (3) are installed on both sides of the inner wall of the support (12), and the output ends of the hydraulic cylinders (3) on both sides are in contact with the far sides of the movable seats (1) on both sides respectively.

3. The segment joint mechanical and waterproof performance testing device according to claim 1, characterized in that: Wooden wedges (11) are provided at the joints of the two segment models (5).

4. The segment joint mechanical and waterproof performance testing device according to claim 1, characterized in that: A waterproof adhesive (10) is provided between the steel trough (9) and the segment model (5).

5. A method for testing the mechanical and waterproof properties of pipe segment joints, based on a device for testing the mechanical and waterproof properties of pipe segment joints according to any one of claims 1 to 4, characterized in that: The following steps are involved: a. Splice the segment models (5), place the two segment models (5) on opposite sides and contact the support blocks (2) on both sides, place curved steel plates (8) on the top and bottom surfaces of the outer walls of the two segment models (5), then install connectors (7) on the outside of the curved steel plates (8), and finally use fastening bolts (6) to penetrate the connectors (7); b. Then drive the hydraulic cylinder (3) to move the mobile base so that the two segment models (5) are close to each other; c. By rotating the nut on the fastening bolt (6) on one side, the pressure of the two arc-shaped steel plates (8) on the segment models (5) on both sides is different, thereby causing the segment models (5) on both sides to be misaligned along the joint; d. Insert the wooden wedges (11) into the joints of the segment models (5) on both sides; e. Place the steel trough (9) outside the joint of the concrete segment model (5), and seal the joint with the steel trough (9), then inject waterproof adhesive (10) to bond the steel trough (9) to the surface of the segment model (5), and finally install bolts to fix the steel trough (9) to the outer wall of the segment model (5); f. Use a pressure pump to inject water into the water inlet hole on the top surface of the steel trough (9). When water flows out of the drain port of the steel trough (9), seal the drain hole. Then gradually increase the pressure in the steel trough (9). At the same time, check whether there is leakage at the joint of the segment model (5). Record the side penetration height at the joint of the segment model (5) until the pressure is increased to the point where obvious water leakage appears at the joint of the segment model (5). Record the leakage status and location.

6. A method for testing the mechanical and waterproof properties of pipe segment joints according to claim 5, characterized in that: In the step f, pressurizing step by step includes: First, pressurize to 0.19-1.21MPa at a rate of 0.04-0.06 MPa / min, and maintain the pressure for 9.5-10.5 minutes. The pressure then increases by 0.19-1.21 MPa at each stage, and each pressurization lasts for 9.5-10.5 minutes.

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