A precast concrete lining segment flexural test apparatus

Abstract

The application relates to a precast concrete lining segment bending resistance test device, and relates to the technical field of lining segment bending resistance test devices, which comprises an L-shaped bottom plate, opposite sides of the top of the L-shaped bottom plate are fixedly connected with vertical rods, four top ends of the vertical rods are fixedly connected with a top plate, and the bottom of the top plate is fixedly connected with a hydraulic rod. The application is characterized in that a rotating motor is arranged, the rotating motor can drive the rotating rod to rotate, the worm drives the worm gear to rotate, the rotating motion of the worm gear is transmitted to the threaded rod through the rotating shaft, the rotation of the threaded rod promotes the linear motion of the threaded cylinder in the sliding groove, so that the movable block can stably move along the meshing groove, the position of the placing block can be adjusted, the accurate moving-out and moving-in operation of the segment body can be realized, meanwhile, a wear-resistant pad layer is arranged on the inner side of the sliding groove, the friction loss during the movement of the threaded cylinder can be reduced, and the service life of the equipment is prolonged.

Description

Technical Field

[0001] This application relates to a bending resistance testing device for lining segments, and more particularly to a bending resistance testing device for precast concrete lining segments. Background Technology

[0002] Engineering testing and inspection is an important component of construction technology management and an indispensable part of construction quality control and final acceptance evaluation. Engineering testing and inspection plays a vital role in improving project quality, accelerating project progress, reducing project costs, and promoting the advancement of construction technology.

[0003] The existing patent (publication number: CN205192869U) discloses a bending resistance testing device for shield tunnel lining segments, including a main controller, a platform seat for placing the tested segment, a reaction frame installed on the platform seat, a force-applying mechanism that applies downward pressure to the middle of the tested segment, and two sets of segment support members on the left and right sides respectively supporting the two ends of the tested segment. The tested segment is fastened to the platform seat. The force-applying mechanism includes two hydraulic jacks symmetrically arranged below the crossbeam, and a force transmission beam is set below each of the two hydraulic jacks. The left and right ends of each force transmission beam are supported on two lower support beams respectively. The segment support members include an inner support block and an outer support block. A horizontal displacement monitoring unit is installed on the outer support block, and two vertical displacement detection units are arranged below the middle of the tested segment. This utility model has a simple structure, reasonable design, is easy to use and operate, and has good performance. It can easily and quickly conduct bending resistance tests on shield tunnel segments of different diameters.

[0004] While the device described in the aforementioned document solves the problem of not being able to easily and quickly conduct bending tests on large-diameter shield tunnel segments, it lacks a moving-in / moving structure during use. When loading the tunnel segment body, it needs to be loaded at the power application point. Since the tunnel segment body is a large and heavy object, it needs to be hoisted for loading. During the loading process, the moving tunnel segment body is prone to hitting the power application point, which can lead to equipment damage. Loading is not convenient. To solve the above problems, a bending test device for precast concrete-lined tunnel segments is proposed. Utility Model Content

[0005] The purpose of this application is to provide a precast concrete lining segment bending resistance test device, which has the advantages of moving out and moving in structure, and solves the problem that when feeding the segment body, the moving segment body is prone to hitting the power application part, making the feeding inconvenient.

[0006] The present application provides a precast concrete lining segment bending resistance test device with the following technical solution: including an L-shaped base plate, on which uprights are fixedly connected to the top of the L-shaped base plate on both opposite sides, a top plate is fixedly connected to the top of the four uprights, a hydraulic rod is fixedly connected to the bottom of the top plate, a movable plate is fixedly connected to the bottom of the hydraulic rod, and a lower pressure block is fixedly connected to the bottom of the movable plate; The L-shaped base plate has an engagement groove on one side, and four sliding grooves are formed inside the engagement groove. A rotary motor is fixedly connected to the side of the L-shaped base plate. A rotating shaft is tightly nested inside the engagement groove via a bearing. A threaded rod is fixedly connected to one end of the rotating shaft. The end of the threaded rod is rotatably connected to the bearing fixedly connected to the side of the sliding groove. A threaded cylinder is threadedly connected to the surface of the threaded rod. A movable block is fixedly connected to the surface of the threaded cylinder. The four movable blocks are divided into two groups, and a placement block is fixedly connected to the top of each group of movable blocks. The top of the placement block has an L-shaped clamping surface. The output end of the rotary motor rotates through the side of the engagement groove and is fixedly connected to a rotating rod. A worm gear is fixedly connected to the surface of the rotating rod, and a worm wheel is fixedly connected to the surface of the rotating shaft. The worm gear and the worm wheel mesh with each other. By adopting the above technical solution, a rotary motor is installed. When the rotary motor runs, it drives the rotating rod to rotate, which in turn drives the worm gear to rotate. The rotation of the worm gear is transmitted to the threaded rod through the shaft. The rotation of the threaded rod causes the threaded cylinder to move linearly within the sliding groove. This allows the movable block to move smoothly along the meshing groove, and the position of the placement block can be adjusted. This enables precise removal and insertion of the segment body. At the same time, a wear-resistant pad is provided on the inner side of the sliding groove, which can reduce frictional loss during the movement of the threaded cylinder and extend the service life of the equipment.

[0007] Preferably, a piezoelectric sensor is provided on one side of the interior of the L-shaped clamping surface, and multiple support rods are fixedly connected to the top side of the L-shaped base plate, with a high-speed camera fixedly connected to the top of each support rod; By adopting the above technical solution and setting up a high-speed camera, the deformation of the tube segment body during the bending test can be captured in real time, and the image data can be transmitted to an external processing device for analysis, thereby achieving accurate evaluation of the tube segment performance. By setting up a piezoelectric sensor, it can be used to detect the pressure change when the L-shaped clamping surface contacts the tube segment, which improves the measurement accuracy of the test device and enhances the convenience and reliability of operation.

[0008] Preferably, two telescopic rods are fixedly connected to the bottom of the top plate, the hydraulic rod is located between the two telescopic rods, the bottom end of the telescopic rod is fixedly connected to the top of the movable plate, and a sliding cylinder is fixedly connected to each of the four corners inside the movable plate, and the sliding cylinder is slidably connected to the surface of the upright. By adopting the above technical solution and through the design of the telescopic rod, the hydraulic rod can be effectively assisted in telescopic movement, which can ensure the stability of the movable plate during the up and down movement and avoid tilting or jamming caused by uneven force. At the same time, the cooperation between the slide and the upright can further enhance the guiding performance of the movable plate, enabling it to maintain precise linear movement in the vertical direction.

[0009] Preferably, the side of the placement block is provided with two fixing plates, an electric push rod is fixedly connected to the side of the fixing plates, and a clamping plate is fixedly connected to one end of the electric push rod; By adopting the above technical solution and setting an electric push rod, the clamping plate can be moved horizontally, thereby achieving precise clamping and fixing of the tunnel segments.

[0010] Preferably, a protective pad is fixedly connected to the side of the clamping plate; By adopting the above technical solution and setting a protective pad, the friction between the clamping plate and the tube segment can be effectively increased, preventing the tube segment from sliding or shifting during the test. The soft material of the protective pad can avoid damage to the surface of the tube segment, ensuring the accuracy of the test results and the integrity of the tube segment.

[0011] Preferably, a folding sleeve is fixedly connected to the side of the movable block, and one end of the folding sleeve is fixedly connected to the side of the L-shaped base plate. By adopting the above technical solution and through the design of the folding sleeve, the internal structure of the sliding groove can be effectively protected, and external dust or impurities can be prevented from entering, thereby extending the service life of the device. At the same time, the folding sleeve is elastic and can automatically unfold or retract during the movement of the moving block, without deformation or jamming due to external interference.

[0012] Preferably, the top of the L-shaped base plate is fixedly connected to a first upright plate and a second upright plate, and the top of the sliding groove is provided with fixed rods on both sides. The four fixed rods are divided into two groups, one group of fixed rods is fixedly connected at both ends to the side of the first upright plate and the side of the L-shaped base plate, and the other group of fixed rods is fixedly connected at both ends to the side of the second upright plate and the side of the L-shaped base plate. By adopting the above technical solution, and by setting the first and second upright plates, the overall stability of the device can be significantly enhanced by the connection structure of the fixing rod.

[0013] Preferably, the folding sleeve is fixedly connected to two opposite sides with fixing rings, and the fixing rings are slidably connected to the surface of the fixing rod; By adopting the above technical solution, the sliding connection between the fixing ring and the fixing rod ensures that the folding sleeve maintains a stable position during the movement of the movable block, preventing displacement or detachment due to external forces. Simultaneously, the design of the fixing ring further limits the expansion and contraction range of the folding sleeve, preventing excessive stretching or compression, thereby improving the reliability of the device operation.

[0014] In summary, this application includes at least one of the following beneficial technical effects: This precast concrete lining segment bending resistance testing device uses a rotary motor. The motor drives a rotating rod, which in turn drives a worm gear to rotate. The rotation of the worm gear is transmitted to the threaded rod via a shaft. The rotation of the threaded rod causes the threaded cylinder to move linearly within a sliding groove. This allows the movable block to move smoothly along the meshing groove, enabling adjustment of the placement block's position and facilitating precise movement of the segment body. Furthermore, a wear-resistant pad is provided on the inner side of the sliding groove to reduce frictional loss during the threaded cylinder's movement, extending the device's service life. Attached Figure Description

[0015] Figure 1 This is a frontal three-dimensional structural diagram of this application; Figure 2 This is a side-view perspective three-dimensional structural diagram of this application; Figure 3 This is a structural schematic diagram of the meshing groove cross-section in this application; Figure 4 This is a structural schematic diagram of the sliding groove cross-section in this application; Figure 5 This is a schematic diagram of the folding sleeve in this application; Figure 6 for Figure 1 A magnified cross-sectional view of the structure at point A in the middle.

[0016] In the picture: 1. L-shaped base plate; 101. Upright pole; 102. Top plate; 103. Hydraulic rod; 104. Telescopic rod; 105. Movable plate; 106. Slide cylinder; 107. Lower pressure block; 108. Engaging groove; 109. Rotary motor; 1010. Rotating rod; 1011. Worm gear; 1012. Rotating shaft; 1013. Worm wheel; 1014. Sliding groove; 1015. Threaded cylinder; 1016. Movable block; 1017. Placement block; 1018. L-shaped clamping surface; 1019. Piezoelectric sensor; 1020. Fixed plate; 1021. Electric push rod; 1022. Clamping plate; 1023. Protective pad; 1024. First upright plate; 1025. Second upright plate; 1026. Fixed rod; 1027. Folding sleeve; 1028. Fixed ring; 1029. Threaded rod; 2. Support rod; 201. High-speed camera. Detailed Implementation

[0017] The following is in conjunction with the appendix Figure 1 - Appendix Figure 6 This application will be described in further detail below.

[0018] Example 1: A bending resistance testing device for precast concrete-lined tunnel segments, referring to... Figure 1 , Figure 2 , Figure 3 and Figure 4 It includes an L-shaped base plate 1, with uprights 101 fixedly connected to the top of the L-shaped base plate 1 on both sides. A top plate 102 is fixedly connected to the top of the four uprights 101. A hydraulic rod 103 is fixedly connected to the bottom of the top plate 102. A movable plate 105 is fixedly connected to the bottom of the hydraulic rod 103. A lower pressure block 107 is fixedly connected to the bottom of the movable plate 105. An engagement groove 108 is formed on one side of the L-shaped base plate 1. Four sliding grooves 1014 are formed inside the engagement groove 108. A rotary motor 109 is fixedly connected to the side of the L-shaped base plate 1. A rotating shaft 1012 is tightly nested inside the engagement groove 108 via bearings. A threaded rod 1029 is fixedly connected to one end of the rotating shaft 1012. The end of the threaded rod 1029 is rotatably connected to a bearing fixedly connected to the side of the sliding groove 1014. A threaded cylinder 1015 is threadedly connected to the surface of the threaded rod 1029. A movable block 1016 is fixedly connected to the surface of the threaded cylinder 1015. The four movable blocks 1016 are divided into two groups, and a placement block 1017 is fixedly connected to the top of each group of movable blocks 1016. An L-shaped clamping surface 1018 is formed on the top of the placement block 1017. The output end of the rotary motor 109 rotates through the side of the engagement groove 108 and is fixedly connected to a rotating rod 1010. A worm gear 1011 is fixedly connected to the surface of the rotating shaft 1012, and a worm wheel 1013 is fixedly connected to the surface of the rotating shaft 1012. The worm gear 1011 and the worm wheel 1013 mesh with each other. By setting a rotary motor 109, the operation of the rotary motor 109 can drive the rotating shaft 1010 to rotate, which in turn causes the worm gear 1011 to drive the worm wheel 1013 to rotate. The rotation of the worm wheel 1013 is transmitted to the threaded rod 1029 through the rotating shaft 1012. The rotation of the threaded rod 1029 causes the threaded cylinder 1015 to move linearly in the sliding groove 1014, so that the movable block 1016 can move smoothly along the meshing groove 108, and the position of the placement block 1017 can be adjusted, thereby realizing the precise removal and insertion of the tube body. At the same time, a wear-resistant pad is provided on the inner side of the sliding groove 1014, which can reduce the friction loss when the threaded cylinder 1015 moves and extend the service life of the equipment.

[0019] Please see Figure 2 and Figure 6A piezoelectric sensor 1019 is installed on one side of the L-shaped clamping surface 1018. Multiple support rods 2 are fixedly connected to the top side of the L-shaped base plate 1. A high-speed camera 201 is fixedly connected to the top of the support rods 2. By setting the high-speed camera 201, the deformation of the tube segment body during the bending test can be captured in real time, and the image data can be transmitted to an external processing device for analysis, thereby realizing the accurate evaluation of the tube segment performance. By setting the piezoelectric sensor 1019, it can be used to detect the pressure change when the L-shaped clamping surface 1018 contacts the tube segment, which improves the measurement accuracy of the test device and enhances the convenience and reliability of operation.

[0020] Please see Figure 2 Two telescopic rods 104 are fixedly connected to the bottom of the top plate 102. A hydraulic rod 103 is located between the two telescopic rods 104. The bottom end of the telescopic rods 104 is fixedly connected to the top of the movable plate 105. Slide cylinders 106 are fixedly connected to the four corners inside the movable plate 105. The slide cylinders 106 are slidably connected to the surface of the upright 101. Through the design of the telescopic rods 104, the hydraulic rods 103 can be effectively assisted in telescopic movements, which can ensure the stability of the movable plate 105 during up and down movement and avoid tilting or jamming caused by uneven force. At the same time, the cooperation between the slide cylinders 106 and the upright 101 can further enhance the guiding performance of the movable plate 105, enabling it to maintain precise linear movement in the vertical direction.

[0021] Please see Figure 3 and Figure 6 The placement block 1017 has two fixing plates 1020 on its side. An electric push rod 1021 is fixedly connected to the side of the fixing plate 1020. A clamping plate 1022 is fixedly connected to one end of the electric push rod 1021. By setting the electric push rod 1021, the clamping plate 1022 can be moved horizontally, thereby achieving precise clamping and fixing of the tube segment. A protective pad 1023 is fixedly connected to the side of the clamping plate 1022. By setting the protective pad 1023, the friction between the clamping plate 1022 and the tube segment can be effectively increased, preventing the tube segment from sliding or shifting during the test. The soft material of the protective pad 1023 can avoid damage to the surface of the tube segment, ensuring the accuracy of the test results and the integrity of the tube segment.

[0022] Please see Figure 5A folding sleeve 1027 is fixedly connected to the side of the movable block 1016. One end of the folding sleeve 1027 is fixedly connected to the side of the L-shaped base plate 1. The design of the folding sleeve 1027 can effectively protect the internal structure of the sliding groove 1014, preventing external dust or impurities from entering, thereby extending the service life of the device. At the same time, the folding sleeve 1027 is elastic and can automatically unfold or retract during the movement of the movable block 1016, without deformation or jamming due to external interference. A first upright plate 1024 and a second upright plate 1025 are fixedly connected to the top of the L-shaped base plate 1. Fixed rods 1026 are provided on both opposite sides of the top of the sliding groove 1014. The four fixed rods 1026 are divided into two groups of two, with one group of fixed rods 1026... The first upright plate 1024 and the L-shaped base plate 1 are fixedly connected at both ends, and the second upright plate 1025 and the L-shaped base plate 1 are fixedly connected at both ends, respectively. By setting the first upright plate 1024 and the second upright plate 1025, the connection structure of the fixed rods 1026 can be coordinated to significantly enhance the stability of the overall device. The folding sleeve 1027 is fixedly connected to the opposite sides with fixing rings 1028. The fixing rings 1028 are slidably connected to the surface of the fixed rods 1026. Through the sliding connection between the fixing rings 1028 and the fixed rods 1026, the folding sleeve 1027 can maintain a stable position during the movement of the movable block 1016, avoiding displacement or detachment due to external forces. At the same time, the design of the fixing rings 1028 can further limit the expansion and contraction range of the folding sleeve 1027, preventing it from being overstretched or compressed, thereby improving the reliability of the device operation.

[0023] The implementation principle of this application embodiment is as follows: When conducting the bending test, the segment body is first hoisted onto the L-shaped clamping surface 1018 of the placement block 1017. Then, the rotary motor 109 is started, which can drive the rotating rod 1010 to rotate. Through the meshing transmission of the worm gear 1011 and the worm wheel 1013, the threaded rod 1029 can drive the movable block 1016 to move smoothly along the meshing groove 108, thereby adjusting the position of the placement block 1017 and accurately moving the segment body into the test area. Subsequently, the electric push rod 1021 is started, pushing the clamping plate 1022 to clamp and stabilize the segment in the horizontal direction. During this process, the protective pad 1023 can provide sufficient friction and protect the surface of the segment from damage. After stabilization is completed; Hydraulic rod 103 begins to apply downward pressure, applying a vertical load to the segment through movable plate 105 and lower pressure block 107. Piezoelectric sensor 1019 can monitor the pressure change between the clamping surface and the segment in real time. Telescopic rod 104 assists hydraulic rod 103 in completing telescopic movements, ensuring the stability of movable plate 105 during movement. The cooperation between slide cylinder 106 and upright rod 101 further improves the guiding performance, ensuring that lower pressure block 107 can accurately apply force in a straight line. During this process, high-speed camera 201 captures the deformation image of the segment under stress and transmits the data to external equipment for analysis to evaluate its bending resistance. During the operation of the movable block 1016, the folding sleeve 1027 can automatically unfold or retract as the movable block 1016 moves, effectively isolating external dust and impurities from entering the sliding groove 1014. At the same time, the sliding connection between the fixing ring 1028 and the fixing rod 1026 ensures the stability of the folding sleeve 1027 and prevents it from shifting or being overstretched.

Claims

1. A precast concrete lining segment bending resistance test device, comprising an L-shaped base plate (1), characterized in that: The L-shaped base plate (1) has uprights (101) fixedly connected to the top of each of the opposite sides. The top of the four uprights (101) is fixedly connected to a top plate (102). The bottom of the top plate (102) is fixedly connected to a hydraulic rod (103). The bottom of the hydraulic rod (103) is fixedly connected to a movable plate (105). The bottom of the movable plate (105) is fixedly connected to a lower pressure block (107). The L-shaped base plate (1) has a meshing groove (108) on one side inside. The meshing groove (108) has four sliding grooves (1014) inside. A rotary motor (109) is fixedly connected to the side of the L-shaped base plate (1). A rotating shaft (1012) is tightly nested inside the meshing groove (108) via a bearing. A threaded rod (1029) is fixedly connected to one end of the rotating shaft (1012). The end of the threaded rod (1029) is rotatably connected to the bearing fixedly connected to the side of the sliding groove (1014). A threaded cylinder (1015) is threadedly connected to the surface of the threaded rod (1029). The four movable blocks (1016) are fixedly connected to the surface. The four movable blocks (1016) are divided into two groups in pairs. The top of each group of movable blocks (1016) is fixedly connected to a placement block (1017). The top of the placement block (1017) is provided with an L-shaped clamping surface (1018). The output end of the rotary motor (109) rotates through the side of the meshing groove (108) and is fixedly connected to a rotating rod (1010). The surface of the rotating rod (1010) is fixedly connected to a worm (1011). The surface of the rotating shaft (1012) is fixedly connected to a worm wheel (1013). The worm (1011) and the worm wheel (1013) mesh with each other.

2. The precast concrete lining segment bending resistance test device according to claim 1, characterized in that: A piezoelectric sensor (1019) is provided on one side inside the L-shaped clamping surface (1018), and a plurality of support rods (2) are fixedly connected to the top side of the L-shaped base plate (1), and a high-speed camera (201) is fixedly connected to the top of the support rods (2).

3. The precast concrete lining segment bending resistance test device according to claim 1, characterized in that: The bottom of the top plate (102) is fixedly connected to two telescopic rods (104), the hydraulic rod (103) is located between the two telescopic rods (104), the bottom end of the telescopic rod (104) is fixedly connected to the top of the movable plate (105), and the four corners inside the movable plate (105) are fixedly connected to slide cylinders (106), and the slide cylinders (106) are slidably connected to the surface of the upright (101).

4. The precast concrete lining segment bending resistance test device according to claim 1, characterized in that: The placement block (1017) has two fixing plates (1020) on its side. An electric push rod (1021) is fixedly connected to the side of the fixing plate (1020). A clamping plate (1022) is fixedly connected to one end of the electric push rod (1021).

5. The precast concrete lining segment bending resistance test device according to claim 4, characterized in that: A protective pad (1023) is fixedly connected to the side of the clamping plate (1022).

6. The precast concrete lining segment bending resistance test device according to claim 1, characterized in that: The movable block (1016) is fixedly connected to a folding sleeve (1027) on its side, and one end of the folding sleeve (1027) is fixedly connected to the side of the L-shaped base plate (1).

7. The precast concrete lining segment bending resistance test device according to claim 6, characterized in that: The top of the L-shaped base plate (1) is fixedly connected to a first upright plate (1024) and a second upright plate (1025). The top of the sliding groove (1014) is provided with fixed rods (1026) on both sides. The four fixed rods (1026) are divided into two groups. One group of fixed rods (1026) is fixedly connected at both ends to the side of the first upright plate (1024) and the side of the L-shaped base plate (1). The other group of fixed rods (1026) is fixedly connected at both ends to the side of the second upright plate (1025) and the side of the L-shaped base plate (1).

8. The precast concrete lining segment bending resistance test device according to claim 7, characterized in that: The folding sleeve (1027) is fixedly connected to two opposite sides by fixing rings (1028), and the fixing rings (1028) are slidably connected to the surface of the fixing rod (1026).

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