Post-tensioned prestressed concrete beam duct friction test device

Abstract

The present invention discloses a post-tensioning prestressed concrete beam pipeline friction test device, which relates to the technical field of friction detection devices, including a force reinforcement bundle composed of multiple force reinforcements, two groups of jacks, two pressure sensors, two groups of limiter assemblies and a computer terminal, wherein the pressure sensors are connected to the computer terminal through a data transmission line, the force reinforcement bundle is arranged in the concrete beam pipeline, and the two groups of jacks, two pressure sensors and two groups of limiter assemblies are respectively arranged at both ends of the force reinforcement bundle. The present invention has the outstanding advantages of two-person operation, high efficiency, simple operation, concise and clear calculation process, standardized detection process, objective and accurate detection data, precise process control, small interference in detection results, reduced work intensity and low transformation cost, and the position of each force reinforcement in the pipeline can be limited by the limiter assembly, which can ensure that each force reinforcement can contact the inner wall of the pipeline, thereby ensuring that the detection result is accurate.

Description

Technical Field

[0001] The invention relates to the technical field of friction detection devices, and in particular to a post-tensioning prestressed concrete beam pipeline friction test device. Background Art

[0002] The calculation of axial force, shear force and bending moment generated by post-tensioning on the cross section of concrete beam components needs to take into account the prestress of the prestressed tendons. The prestress needs to deduct the prestress loss. The prestress loss includes: the friction between the prestressed tendons and the pipe, the friction between the prestressed tendons and the anchor ring and the bell mouth, the deformation of the anchor head, the shrinkage of the prestressed tendons and the joint compression of the block assembly components, the temperature difference between the pedestal and the steel bar, the elastic compression of the concrete, the stress relaxation of the prestressed tendons, and the shrinkage creep of the concrete. The most important of the above prestress losses is the friction loss between the prestressed tendons and the pipe. This loss needs to be tested on the construction site based on the beam type, pipe bending angle, pipe diameter, number of prestressed tendons and other parameters, and the accurate μ value and κ value need to be calculated.

[0003] The test method for the friction coefficient μ and deviation coefficient κ of the railway post-tensioned prestressed concrete beam pipeline is specifically specified. The main instruments and tools used are: jacks, anchors and limit plates, restraint rings, centering washers, and pressure sensors. The above equipment works alone and requires manual command to work together. Although the specification has given specific test method steps, the coordination of various test equipment and tools is very poor. In the current test practice, there is no dedicated test equipment with a high degree of integration. With the increasing requirements of regulatory agencies for the informatization and intelligence of test inspections, this decentralized equipment and method has been difficult to meet the development requirements of railway construction. There are simple equipment, multiple test personnel need to be arranged, and huge manpower consumption. In addition, some force bars will not be in contact with the inner wall of the pipeline during the test, which will lead to inaccurate test results. Summary of the invention

[0004] The purpose of the present invention is to provide a post-tensioned prestressed concrete beam pipe friction test device, which solves the problem of huge manpower consumption and the situation that some reinforcement bars are not in contact with the inner wall of the pipe during detection, thus causing the detection results to be inaccurate.

[0005] The present invention solves the above technical problems through the following technical solutions. The present invention comprises a force reinforcement bundle composed of a plurality of force reinforcements, two groups of jacks, two pressure sensors, two groups of limiter assemblies and a computer terminal. The pressure sensors are connected to the computer terminal through a data transmission line. The force reinforcement bundle is arranged in a concrete beam pipe. The two groups of jacks, two pressure sensors and two groups of limiter assemblies are respectively arranged at both ends of the force reinforcement bundle. The limiter assemblies, pressure sensors and extrusion assemblies are arranged in sequence from the inside to the outside.

[0006] The limiting assembly includes an anchor plate and a constraint ring, the constraint ring is used to limit the position of each force bar so that each force bar can contact the inner wall of the pipe, the edge of the constraint ring is evenly provided with a plurality of wire placement holes, the edge of the anchor plate is provided with a plurality of through holes, the force bars are penetrated through the wire placement holes and the through holes, a groove is provided on the central inner wall of the wire placement hole, and a rotating plate is rotatably installed on the inner wall of the groove.

[0007] The limit assembly also includes an adjustment assembly, which is used to adjust the distance between each limit block and the center of the circle. The adjustment assembly includes a mounting tube, a telescopic member and a truncated cone control block. The mounting tube is arranged between the anchor plate and the limit block and is connected to the anchor plate by bolts. The mounting tube is located on one side of the anchor plate and has a mounting groove. The telescopic member is installed in the mounting groove. The mounting tube is located on one side of the constraint ring and has a receiving groove. The truncated cone control block is arranged in the receiving groove and is installed at the output end of the telescopic member. A fixing rod is installed on the truncated cone control block, and the fixing rod is arranged on the inner side of the limit block. A plurality of limit block ends are welded with mounting plates on the rear sides. The mounting plate is arranged in the receiving groove and a limiting spring is installed between the mounting plate and the inner wall of the receiving groove.

[0008] Preferably, two grooves are provided on the inner wall of the wire placement hole and a rotating piece is also rotatably mounted on the inner wall of the groove, and the two grooves are symmetrically arranged.

[0009] Preferably, the restraint ring is an integral structure and is fixedly mounted on one side of the anchor plate.

[0010] Preferably, the constraint ring is composed of a plurality of limit blocks, and the wire placement hole is opened at the center position of the edge of the limit block.

[0011] Preferably, a plurality of guide holes are evenly formed on the outer side wall of the accommodating groove, a guide rod is mounted on the mounting plate, and an end of the guide rod is clamped in the guide hole.

[0012] Preferably, the telescopic member is one of an electric telescopic rod, a pneumatic cylinder or an oil cylinder.

[0013] Preferably, a reinforcement clip is provided on the outer side of the jack, and the reinforcement clip is used to fix the end reinforcement.

[0014] Preferably, a centering gasket is provided between the pressure sensor and the jack.

[0015] Preferably, a data line wheel is arranged around the pipeline, and the data line wheel is used to receive the data transmission line.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. The present invention has the outstanding advantages of two-person operation, high efficiency, simple operation, concise and clear calculation process, standardized detection process, objective and accurate detection data, precise process control, small interference in detection results, reduced work intensity and low transformation cost.

[0018] 2. The present invention can limit the position of each force reinforcement in the pipeline through the limit assembly, and can ensure that each force reinforcement can contact the inner wall of the pipeline, thereby ensuring the accuracy of the detection result.

[0019] 3. The present invention can adjust the distance between each limit block and the center of the circle by adjusting the components, so it can be flexibly adjusted according to the diameter of the pipeline, and the scope of use is wider. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural view of the present invention;

[0021] Figure 2 This is a structural view of a position limiting assembly in the first embodiment of the present invention;

[0022] Figure 3 A structural diagram of a restraining ring in a first embodiment of the present invention;

[0023] Figure 4 This is a structural view of a position limiting assembly in a second embodiment of the present invention;

[0024] Figure 5 It is a left exploded view of the limiting assembly in the second embodiment of the present invention;

[0025] Figure 6 It is a right exploded view of the limit assembly in the second embodiment of the present invention;

[0026] Figure 7 This is a structural view of a limiting block in the second embodiment of the present invention.

[0027] The numbers in the figure represent:

[0028] 1. Force reinforcement bundle; 2. Jack; 3. Pressure sensor; 4. Limiting assembly; 401. Anchor plate; 402. Constraint ring; 5. Computer terminal; 6. Data transmission line; 7. Wire hole; 8. Perforation; 9. Rotating plate; 10. Limiting block; 11. Adjusting assembly; 1101. Mounting cylinder; 1102. Telescopic member; 1103. Cone control block; 12. Accommodating groove; 13. Fixing rod; 14. Mounting plate; 15. Limiting spring; 16. Guide hole; 17. Guide rod; 18. Force reinforcement clip; 19. Centering washer; 20. Data line wheel. DETAILED DESCRIPTION

[0029] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0030] Embodiment 1

[0031] This embodiment provides a technical solution: a post-tensioned prestressed concrete beam pipe friction test device, such as Figure 1 As shown, the present invention includes a tendon bundle 1 composed of multiple tendons, two groups of jacks 2, two pressure sensors 3, two groups of limit assemblies 4 and a computer terminal 5. The pressure sensors 3 are connected to the computer terminal 5 through a data transmission line 6. The computer terminal 5 can receive the pressure information detected by the pressure sensor 3, and the friction data is calculated according to the detected data using the friction calculation software of the computer terminal 5. The tendon bundle 1 is arranged in the concrete beam pipeline, the two groups of jacks 2, the two pressure sensors 3 and the two groups of limit assemblies 4 are respectively arranged at both ends of the tendon bundle 1, the limit assemblies 4, the pressure sensors 3 and the extrusion assemblies are arranged in sequence from the inside to the outside, the pressure sensor 3 is a through-type structure with an accuracy of 0.5 level, and after installation, the steel strand does not touch the inner wall of the sensor. When conducting test detection, both ends can be used as fixed ends or tensioning ends, so it is convenient for multiple groups to detect.

[0032] Furthermore, the jack 2 is connected to an external oil pump to pull the tension end tendon bundle 1. A tendon clip 18 is provided on the outside of the jack 2, and the end tendon can be fixed by the tendon clip 18. The rated load of the jack 2 is determined according to the maximum tension force in the actual test. The rated load needs to be greater than 1.2 times the maximum tension force, and the stroke of the jack 2 meets the elongation requirement. The matching oil pressure gauge has an accuracy of 0.4, and the jack 2 has pressure-maintaining performance.

[0033] Furthermore, a centering washer 19 is provided between the pressure sensor 3 and the jack 2. The centering washer 19 is used for centering installation between the sensor and the jack 2 or between multiple jacks 2. The centering washer 19 is a self-made tool, which is a series of tools processed according to the outer diameter of the sensor and the actual size of the jack 2.

[0034] Furthermore, a data line wheel 20 is arranged around the pipeline, and the data line wheel 20 is used to receive the data transmission line 6. The length of the data transmission line 6 is 300 meters. The test line wheel is wound and fixed, and there are data transmission interfaces at both ends, so that the length of the test beam can be freely extended and retracted.

[0035] In the specific implementation, such as Figure 2 and Figure 3As shown, the limiting assembly 4 includes an anchor pad 401 and a constraint ring 402. The constraint ring 402 is used to limit the position of each force reinforcement so that each force reinforcement can contact the inner wall of the pipeline. The constraint ring 402 is an integral structure and the constraint ring 402 is fixedly installed on one side of the anchor pad 401. A plurality of wire holes 7 are evenly opened on the edge of the constraint ring 402. A plurality of through holes 8 are opened on the edge of the anchor pad 401. The force reinforcement is penetrated in the wire holes 7 and the through holes 8. The wire holes 7 correspond to the centers of the through holes 8. The diameter of the anchor pad 401 is larger than the diameter of the constraint ring 402. , each force reinforcement can be limited by the wire hole 7. When in use, the diameter of the constraint ring 402 should be slightly smaller than the inner diameter of the pipeline. The constraint ring 402 is placed in the pipeline, and each force reinforcement is placed in the wire hole 7 at the edge of the constraint ring 402. One side of the force reinforcement is close to the inner wall of the pipeline. A groove is opened on the central inner wall of the wire hole 7, and a rotating piece 9 is rotatably installed on the inner wall of the groove. The rotating piece 9 can rotate when the force reinforcement moves, thereby minimizing the friction between the force reinforcement and the force reinforcement, thereby ensuring the accuracy of the detection result under the effect of limiting the force reinforcement.

[0036] Furthermore, two grooves are provided on the inner wall of the wire placement hole 7, and a rotating piece 9 is also rotatably installed on the inner wall of the groove. The two grooves are symmetrically arranged. By additionally arranging two rotating pieces 9, the force reinforcement can be limited from three directions, thereby preventing the force reinforcement from contacting the inner wall of the groove.

[0037] Embodiment 2

[0038] This embodiment provides a technical solution: a post-tensioned prestressed concrete beam pipe friction test device, such as Figure 1 As shown, the present invention includes a tendon bundle 1 composed of multiple tendons, two groups of jacks 2, two pressure sensors 3, two groups of limit assemblies 4 and a computer terminal 5. The pressure sensors 3 are connected to the computer terminal 5 through a data transmission line 6. The computer terminal 5 can receive the pressure information detected by the pressure sensor 3, and the friction data is calculated according to the detected data using the friction calculation software of the computer terminal 5. The tendon bundle 1 is arranged in the concrete beam pipeline, the two groups of jacks 2, the two pressure sensors 3 and the two groups of limit assemblies 4 are respectively arranged at both ends of the tendon bundle 1, the limit assemblies 4, the pressure sensors 3 and the extrusion assemblies are arranged in sequence from the inside to the outside, the pressure sensor 3 is a through-type structure with an accuracy of 0.5 level, and after installation, the steel strand does not touch the inner wall of the sensor. When conducting test detection, both ends can be used as fixed ends or tensioning ends, so it is convenient for multiple groups to detect.

[0039] Furthermore, the jack 2 is connected to an external oil pump to pull the tension end tendon bundle 1. A tendon clip 18 is provided on the outside of the jack 2, and the end tendon can be fixed by the tendon clip 18. The rated load of the jack 2 is determined according to the maximum tension force in the actual test. The rated load needs to be greater than 1.2 times the maximum tension force, and the stroke of the jack 2 meets the elongation requirement. The matching oil pressure gauge has an accuracy of 0.4, and the jack 2 has pressure-maintaining performance.

[0040] Furthermore, a centering washer 19 is provided between the pressure sensor 3 and the jack 2. The centering washer 19 is used for centering installation between the sensor and the jack 2 or between multiple jacks 2. The centering washer 19 is a self-made tool, which is a series of tools processed according to the outer diameter of the sensor and the actual size of the jack 2.

[0041] Furthermore, a data line wheel 20 is arranged around the pipeline, and the data line wheel 20 is used to receive the data transmission line 6. The length of the data transmission line 6 is 300 meters. The test line wheel is wound and fixed, and there are data transmission interfaces at both ends, so that the length of the test beam can be freely extended and retracted.

[0042] In the specific implementation, such as Figure 4 As shown, the limiting assembly 4 includes an anchor pad 401 and a constraint ring 402. The constraint ring 402 is used to limit the position of each force reinforcement so that each force reinforcement can contact the inner wall of the pipeline. The constraint ring 402 is an integral structure and the constraint ring 402 is fixedly installed on one side of the anchor pad 401. A plurality of wire holes 7 are evenly opened on the edge of the constraint ring 402. A plurality of through holes 8 are opened on the edge of the anchor pad 401. The force reinforcement is penetrated in the wire holes 7 and the through holes 8. The wire holes 7 correspond to the centers of the through holes 8. The diameter of the anchor pad 401 is larger than the diameter of the constraint ring 402. , each force reinforcement can be limited by the wire hole 7. When in use, the diameter of the constraint ring 402 should be slightly smaller than the inner diameter of the pipeline. The constraint ring 402 is placed in the pipeline, and each force reinforcement is placed in the wire hole 7 at the edge of the constraint ring 402. One side of the force reinforcement is close to the inner wall of the pipeline. A groove is opened on the central inner wall of the wire hole 7, and a rotating piece 9 is rotatably installed on the inner wall of the groove. The rotating piece 9 can rotate when the force reinforcement moves, thereby minimizing the friction between the force reinforcement and the force reinforcement, thereby ensuring the accuracy of the detection result under the effect of limiting the force reinforcement.

[0043] Furthermore, two grooves are provided on the inner wall of the wire placement hole 7, and a rotating piece 9 is also rotatably installed on the inner wall of the groove. The two grooves are symmetrically arranged. By additionally arranging two rotating pieces 9, the force reinforcement can be limited from three directions, thereby preventing the force reinforcement from contacting the inner wall of the groove.

[0044] In the specific implementation, such as Figure 5-Figure 7As shown, the limit assembly 4 also includes an adjustment assembly 11, which is used to adjust the distance between each limit block 10 and the center of the circle, so it can be flexibly adjusted according to the diameter of the pipeline, and has a wider range of uses. The adjustment assembly 11 includes a mounting cylinder 1101, a telescopic member 1102 and a truncated cone control block 1103. The mounting cylinder 1101 is arranged between the anchor plate 401 and the limit block 10, and the mounting cylinder 1101 is connected to the anchor plate 401 by bolts. The mounting cylinder 1101 is located on one side of the anchor plate 401 and has a mounting groove, and the telescopic member 1102 is installed in the mounting groove. The mounting cylinder 1101 is located on one side of the constraint ring 402 and has a receiving groove 12, and the truncated cone control block 1103 is arranged in the receiving groove 12. And the truncated cone control block 1103 is installed at the output end of the telescopic member 1102, and a fixing rod 13 is installed on the truncated cone control block 1103, and the fixing rod 13 is arranged on the inner side of the limit block 10, and a plurality of mounting plates 14 are welded on the rear side of the ends of the limit blocks 10, and the mounting plates 14 are arranged in the accommodating groove 12, and a limiting spring 15 is installed between the mounting plates 14 and the inner wall of the accommodating groove 12. When adjusting the position of the limit block 10, the telescopic member 1102 is connected to an external power supply, and the telescopic member 1102 can push the truncated cone control block 1103 outward, and the truncated cone control block 1103 can push each limit block 10 outward through the edge bevel, and the limit block 10 can squeeze the limit spring 15 and move outward, thereby achieving an adjustment effect.

[0045] Furthermore, a plurality of guide holes 16 are evenly opened on the outer wall of the accommodating groove 12, and a guide rod 17 is installed on the mounting plate 14, and the end of the guide rod 17 is clamped in the guide hole 16. When performing the above operation, the guide rod 17 can move outward along the guide hole 16 at the same time, so the guide rod 17 can ensure that the limit block 10 is more stable when moving.

[0046] Furthermore, the telescopic member 1102 is one of an electric telescopic rod, a pneumatic cylinder or an oil cylinder.

[0047] When using the present invention for detection, according to Figure 1It is required to assemble each test equipment and tool in sequence, connect the force sensor data transmission line 6 to the computer terminal 5, connect the high-pressure oil pump to the active end jack 2 with a high-pressure oil pipe, open the special calculation software, input the relevant engineering information, and query the design tension control force P, pipeline length L, and curve wrap angle θ in advance. After debugging the software, wait for the formal test to start. Before the active end is loaded, the passive end jack 2 oil cylinder extends 15cm, applies a tension force of 0.1P, straightens the steel strand bundle, and then officially starts the test. The active end loading steps are: 0→0.2P initial reading→0.3P→0.4P→0.5P→0.6P→0.7P→0.8P→0.9P→1.0P→0 unloading. The active end jack 2 should be loaded slowly and evenly, and the loading time for each level should not be less than 1min. The oil should not be returned to adjust the load. When loading the tension force at each level, after the load at each level is loaded and stable, the active end tension force P1 and the passive end tension force P2 are automatically collected by the special software.

[0048] Then swap the positions of the active end and the passive end and repeat the above loading steps.

[0049] After completing the above steps, a pipeline test is completed, and the value of Ci is automatically calculated by the dedicated software, Ci=ln(P1 / P2).

[0050] According to the number of selected pipelines, complete the other pipeline tests according to the above steps and calculate the value of Ci.

[0051] After all pipeline test data are completed, the dedicated software automatically performs continuous summation calculations and automatically analyzes the equation group to obtain the precise friction coefficient μ value between the prestressed tendons and the pipeline, and the influence coefficient κ value of the local deviation of each meter of the pipeline on the friction.

[0052] The above are only preferred embodiments of the present invention, which are only illustrative and not restrictive. Those skilled in the art understand that many changes, modifications, and even equivalences may be made to the present invention within the spirit and scope defined by the claims, but all of them will fall within the scope of protection of the present invention.

Claims

1. Post-tensioned prestressed concrete beam pipe friction test device, characterized in that: The invention comprises a reinforcement bundle (1) composed of a plurality of reinforcement bars, two groups of jacks (2), two pressure sensors (3), two groups of limiter assemblies (4) and a computer terminal (5), wherein the pressure sensors (3) are connected to the computer terminal (5) via a data transmission line (6), the reinforcement bundle (1) is arranged in a concrete beam pipe, the two groups of jacks (2), the two pressure sensors (3) and the two groups of limiter assemblies (4) are respectively arranged at two ends of the reinforcement bundle (1), and the limiter assemblies (4), the pressure sensors (3) and the extrusion assembly are arranged in sequence from the inside to the outside; The limiting assembly (4) comprises an anchor plate (401) and a constraint ring (402), wherein the constraint ring (402) is used to limit the position of each force reinforcement so that each force reinforcement can contact the inner wall of the pipeline, a plurality of wire placement holes (7) are evenly opened on the edge of the constraint ring (402), a plurality of through holes (8) are opened on the edge of the anchor plate (401), the force reinforcement is penetrated in the wire placement holes (7) and the through holes (8), a groove is opened on the central inner wall of the wire placement hole (7), and a rotating piece (9) is rotatably installed on the inner wall of the groove; The limit assembly (4) further comprises an adjustment assembly (11), wherein the adjustment assembly (11) is used to adjust the distance between each limit block (10) and the center of the circle, and the adjustment assembly (11) comprises a mounting tube (1101), a telescopic member (1102) and a truncated table control block (1103), wherein the mounting tube (1101) is arranged between the anchor plate (401) and the limit block (10), and the mounting tube (1101) and the anchor plate (401) are connected by bolts, and the mounting tube (1101) is provided with a mounting groove on one side of the anchor plate (401), and the telescopic member (1102) is installed in the mounting groove, and the mounting tube (1101) is provided with a mounting groove on one side of the anchor plate (401). The mounting cylinder (1101) is provided with a receiving groove (12) on one side of the restraining ring (402); the truncated cone control block (1103) is arranged in the receiving groove (12) and the truncated cone control block (1103) is installed at the output end of the telescopic member (1102); a fixing rod (13) is installed on the truncated cone control block (1103); the fixing rod (13) is arranged on the inner side of the limit block (10); a plurality of installation pieces (14) are welded to the rear side of the ends of the limit blocks (10); the installation piece (14) is arranged in the receiving groove (12) and a limiting spring (15) is installed between the installation piece (14) and the inner wall of the receiving groove (12).

2. The post-tensioned prestressed concrete beam pipe friction test device according to claim 1, characterized in that: The inner wall of the wire placement hole (7) is also provided with two grooves, and a rotating piece (9) is also rotatably mounted on the inner wall of the groove, and the two grooves are symmetrically arranged.

3. The post-tensioned prestressed concrete beam pipe friction test device according to claim 1 or 2, characterized in that: The restraining ring (402) is an integral structure and the restraining ring (402) is fixedly mounted on one side of the anchor plate (401).

4. The post-tensioned prestressed concrete beam pipe friction test device according to claim 1 or 2, characterized in that: The restraining ring (402) is composed of a plurality of limiting blocks (10), and the wire placement hole (7) is arranged at the center position of the edge of the limiting block (10).

5. The post-tensioned prestressed concrete beam pipe friction test device according to claim 1, characterized in that: A plurality of guide holes (16) are evenly arranged on the outer side wall of the receiving groove (12), a guide rod (17) is installed on the mounting plate (14), and the end of the guide rod (17) is clamped in the guide hole (16).

6. The post-tensioned prestressed concrete beam pipe friction test device according to claim 1, characterized in that: The telescopic member (1102) is one of an electric telescopic rod, a gas cylinder or an oil cylinder.

7. The post-tensioned prestressed concrete beam pipe friction test device according to claim 1, characterized in that: A reinforcement clip (18) is arranged on the outside of the jack (2), and the reinforcement clip (18) is used to fix the end reinforcement.

8. The post-tensioned prestressed concrete beam pipe friction test device according to claim 1, characterized in that: A centering washer (19) is provided between the pressure sensor (3) and the jack (2).

9. The post-tensioned prestressed concrete beam pipe friction test device according to claim 1, characterized in that: A data line wheel (20) is arranged around the pipeline, and the data line wheel (20) is used to receive the data transmission line (6).

Images