Subway segment detection device

Abstract

The utility model belongs to the technical field of metro construction detection, and particularly relates to a metro segment detection device which comprises a bottom plate, a bending strength testing machine, a linear guide rail and a positioning block are installed on the bottom plate, two sets of sliding seats are installed on the linear guide rail in a sliding mode, segment supporting assemblies are installed on the sliding seats, and each segment supporting assembly comprises a connecting plate. The two connecting plates are installed on the two sets of sliding seats respectively, side plates are installed on the connecting plates, the two connecting plates are both rotationally connected with a first connecting rod and a second connecting rod, the first connecting rod and the second connecting rod are rotationally connected with the other first connecting rod and the other second connecting rod, and a pin shaft connecting the two first connecting rods is rotationally connected with a positioning rod. A pin shaft connected with the two second connecting rods is inserted into a sliding groove in a sliding mode, and the sliding groove is formed in the positioning rod. The duct piece supporting assembly can support subway duct pieces of different sizes and is matched with the positioning block to enable the center of the subway duct piece to be quickly and accurately centered with a loading point of the bending strength testing machine, and the accuracy, reliability, safety and stability of experimental data are guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of subway construction inspection technology, specifically relating to a subway tunnel segment inspection device. Background Technology

[0002] Bending strength is a key indicator of subway tunnel segment quality, and accurate testing is crucial. In the actual production and construction of subway tunnel segments, rigorous bending strength testing is required to ensure that they can withstand the bending stresses generated by soil pressure, vehicle loads, and other complex environmental factors during tunnel operation. If the bending strength of the tunnel segments is insufficient, serious problems such as cracks, deformation, or even collapse may occur in the tunnel lining during long-term use. This could not only lead to subway operation interruptions but also potentially cause major safety accidents, resulting in incalculable economic losses and social impact.

[0003] However, existing methods for testing the bending strength of subway tunnel segments face numerous challenging technical difficulties. Firstly, subway tunnel segments come in a variety of sizes and specifications, with differences in diameter, width, and thickness between segments from different lines and sections. This necessitates that testing equipment provide stable support for segments of various sizes. However, current support systems often fail to provide sufficiently stable and suitable support structures for segments of different sizes. For example, some support systems, when supporting large segments, are prone to localized subsidence or tilting due to improper distribution of support points or insufficient strength of the support materials; while for small segments, there may be issues of over-support or insufficient contact. This unstable support prevents the segments from being in an ideal stress state during testing, severely impacting the accuracy and reliability of the test data.

[0004] Secondly, accurately aligning the center of the tunnel segment with the loading point of the bending strength testing machine has long been a difficult problem to solve effectively. Precise alignment between the segment center and the loading point is fundamental to ensuring that the test results accurately reflect the segment's bending performance. If the alignment deviation is large, the segment will experience uneven stress under bending loads, leading to inaccurate test results. Currently, alignment operations mostly rely on manual measurement and adjustment, a cumbersome and time-consuming process. Manual measurement is easily affected by the accuracy of the measuring tools, the operator's skill level, and subjective factors, making it difficult to achieve high-precision alignment. Utility Model Content

[0005] To address the above problems, the purpose of this utility model is to provide a subway tunnel segment inspection device that solves the significant deficiencies in the existing subway tunnel segment bending strength testing technology regarding support stability and alignment accuracy.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a subway segment inspection device, comprising a base plate on which a bending strength testing machine, a linear guide rail, and a positioning block are mounted. Two sets of slide seats are slidably mounted on the linear guide rail. A segment support assembly is mounted on the slide seats. The segment support assembly includes a connecting plate. Two connecting plates are respectively mounted on the two sets of slide seats. Side plates are mounted on the connecting plates. Both connecting plates are rotatably connected to one end of a connecting rod 1 and a connecting rod 2 via pins. The other end of one connecting rod 1 and connecting rod 2 is rotatably connected to one end of another connecting rod 1 and connecting rod 2 via pins. The pins connecting the two connecting rods 1 are rotatably connected to one end of a positioning rod. The pins connecting the two connecting rods 2 are slidably inserted into a slide groove. The slide groove is formed on the positioning rod. The centerline of the positioning block is on the same vertical plane as the loading point of the bending strength testing machine.

[0007] The beneficial effects of this utility model are: the segment support assembly can stably support subway segments of different sizes, and after being aligned with the positioning block, it can quickly and accurately align the center of the subway segment with the loading point of the bending strength testing machine, ensuring the accuracy, reliability and safety stability of the experimental data.

[0008] In order to facilitate the alignment of the center of the subway tunnel segment with the loading point of the bending strength testing machine;

[0009] As a further improvement to the above technical solution: scale lines are etched on the center line of the positioning block and scale lines are etched on the center line of the positioning rod.

[0010] The beneficial effect of this improvement is that once the scale lines on the positioning rod and the positioning block are aligned, the center of the subway tunnel segment can be quickly and easily aligned with the loading point of the bending strength testing machine.

[0011] In order to quickly determine the line of symmetry between the two slides by using the linkage structure consisting of connecting rod one, connecting rod two and positioning rod, so as to achieve the centering of the subway tunnel segment with the loading point of the bending strength testing machine;

[0012] As a further improvement to the above technical solution: the connecting rod one and the connecting rod two have the same structural size.

[0013] The beneficial effect of this improvement is that when the distance between the connecting rod 1 and the connecting rod 2 changes between the two slides, the included angle changes accordingly, thereby driving the positioning rod to always move along the symmetrical line between the two slides.

[0014] To further ensure the alignment of the center of the subway tunnel segment with the loading point of the bending strength testing machine;

[0015] As a further improvement to the above technical solution: the side plate is connected to the connecting plate by bolts, and the two ends of the side plate are flush with the two end faces of the subway tunnel segment in the axial direction.

[0016] The beneficial effects of this improvement are: operators can replace side plates of different widths to keep the side plates flush with the ends of the subway tunnel segments, thereby ensuring the alignment of the center of the subway tunnel segments with the loading point of the bending strength testing machine.

[0017] To ensure the stability of the segment support assembly during movement;

[0018] As a further improvement to the above technical solution: the number of linear guides is two, and they are arranged parallel to each other on the base plate.

[0019] The beneficial effects of this improvement are: the use of two linear guide rails can ensure the stability of the slide block on the segment support assembly and the subway segment support installed on the segment support assembly.

[0020] To prevent the slide from detaching from the linear guide;

[0021] As a further improvement to the above technical solution: one end of the linear guide rail is flush with one end of the base plate, and a limit block is installed on the end of the base plate that is flush with the linear guide rail.

[0022] The beneficial effect of this improvement is that the limit block acts as a limit, preventing the slide from slipping off the linear guide rail.

[0023] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0026] Figure 3 This is a schematic diagram of the structure of the segment support assembly of this utility model;

[0027] In the diagram: 1. Base plate; 2. Bending strength testing machine; 3. Linear guide rail; 4. Slide block; 5. Segment support assembly; 51. Connecting plate; 52. Side plate; 53. Connecting rod one; 54. Connecting rod two; 55. Positioning rod; 56. Slide groove; 6. Subway segment; 7. Positioning block; 8. Limiting block. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0029] Example 1:

[0030] like Figure 1 As shown in Figure 3: A subway segment inspection device includes a base plate 1. A bending strength testing machine 2, a linear guide rail 3, and a positioning block 7 are mounted on the base plate 1. Two sets of sliding blocks 4 are slidably mounted on the linear guide rail 3. A segment support assembly 5 is mounted on the sliding blocks 4. The segment support assembly 5 includes connecting plates 51. Two connecting plates 51 are respectively mounted on the two sets of sliding blocks 4. Side plates 52 are mounted on the connecting plates 51. Both connecting plates 51 are rotatably connected to one end of a connecting rod 53 and a connecting rod 54 via pins. The other end of one connecting rod 53 and the other connecting rod 54 are rotatably connected to another connecting rod via pins. One end of connecting rod 53 and the other end of connecting rod 54 are rotatably connected to the pins of the two connecting rods 53. The pins of the two connecting rods 54 are slidably inserted into the groove 56, which is formed on the positioning rod 55. The centerline of the positioning block 7 is on the same vertical plane as the loading point of the bending strength testing machine 2. The segment support assembly 5 can stably support subway segments 6 of different sizes, and after being aligned with the positioning block 7, it can quickly and accurately align the center of the subway segment 6 with the loading point of the bending strength testing machine 2, ensuring the accuracy, reliability, and safety stability of the experimental data. The centerline of the positioning block 7 is on the same vertical plane. The positioning rod 55 is etched with scale lines, and the center line of the positioning rod 55 is etched with scale lines. After the scale lines on the positioning rod 55 and the positioning block 7 are aligned, the center of the subway segment 6 can be quickly and conveniently aligned with the loading point of the bending strength testing machine 2. The connecting rod 1 53 and the connecting rod 2 54 have the same structural size. When the distance between the two slide blocks 4 changes, the included angle of the connecting rod 1 53 and the connecting rod 2 54 changes accordingly, thereby driving the positioning rod 55 to move and always be located on the symmetrical line between the two slide blocks 4. The side plate 52 is connected to the connecting plate 51 by bolts. The two ends of the side plate 52 are flush with the two end faces of the subway segment 6 in the axial direction. Operators can replace the side plates 52 with different widths to keep the side plates 52 flush with the ends of the subway segment 6, thereby ensuring the alignment of the center of the subway segment 6 with the loading point of the bending strength testing machine 2. There are two linear guide rails 3, which are arranged parallel to each other on the base plate 1. The use of two linear guide rails 3 can ensure the stability of the slide block 4 supporting the segment support assembly 5 and the subway segment 6 installed on the segment support assembly 5. One end of the linear guide rail 3 is flush with one end of the base plate 1, and a limit block 8 is installed on the end of the base plate 1 that is flush with the linear guide rail 3. The limit block 8 plays a limiting role to prevent the slide block 4 from slipping off the linear guide rail 3.

[0031] The working principle of this technical solution is as follows: The segment support assembly 5 is slid as a whole onto the linear guide rail 3 on one side of the bending strength testing machine 2. The interval between the two connecting plates 51 is adjusted according to the length of the subway segment 6 so that both ends of the hoisted subway segment 6 are placed precisely on the connecting plates 51 and in contact with the side plates 52. Then, the operator pushes the segment support assembly 5, causing the subway segment 6 supported by the segment support assembly 5 to move to the bottom of the bending strength testing machine 2. The position of the segment support assembly 5 is adjusted so that the scale line on the center line of the positioning rod 55 is aligned with the scale line on the positioning block 7. At this time, the center of the subway segment 6 is aligned with the loading point of the bending strength testing machine 2. The operator then moves the subway segment 6... Strain gauges are attached to key locations on the surface to measure the strain changes of concrete and steel reinforcement during the loading process. Displacement sensors are placed at the mid-span and supports of subway segment 6 to measure vertical displacement during loading. Before formal loading, a small preload is applied to the bending strength testing machine 2, generally 5%-10% of the estimated maximum load of the segment support assembly, to check whether the testing device is normal, whether the measuring instruments are working well, and whether the contact between subway segment 6 and the device is tight. After preloading, the load is unloaded, and the condition of the specimen and instruments is observed. If any problems are found, adjustments are made in time. Subsequently, graded loading and continuous loading are carried out in sequence. Data is collected and processed during the loading process to calculate the bending performance of subway segment 6.

[0032] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, there are objectively infinite specific structures. For those skilled in the art, several improvements, modifications, or changes can be made without departing from the principles of the present invention, and the above technical features can also be combined in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A subway tunnel segment inspection device, characterized in that: The system includes a base plate (1), on which a bending strength testing machine (2), a linear guide rail (3), and a positioning block (7) are mounted. Two sets of slide blocks (4) are slidably mounted on the linear guide rail (3). A segment support assembly (5) is mounted on the slide blocks (4). The segment support assembly (5) includes a connecting plate (51). The two connecting plates (51) are respectively mounted on the two sets of slide blocks (4). A side plate (52) is mounted on the connecting plate (51). Both connecting plates (51) are rotatably connected to a connecting rod (53) and a connecting rod (53) via a pin shaft. One end of connecting rod 2 (54) and the other end of one of the connecting rods 1 (53) and 2 (54) are rotatably connected to one end of another connecting rod 1 (53) and 2 (54) via a pin. The pin connecting the two connecting rods 1 (53) is rotatably connected to one end of the positioning rod (55). The pin connecting the two connecting rods 2 (54) is slidably inserted into the slide groove (56). The slide groove (56) is opened on the positioning rod (55). The centerline of the positioning block (7) and the loading point of the bending strength testing machine (2) are on the same vertical plane.

2. The subway tunnel segment inspection device according to claim 1, characterized in that: The positioning block (7) has scale lines etched on its center line, and the positioning rod (55) has scale lines etched on its center line.

3. The subway tunnel segment inspection device according to claim 1, characterized in that: The connecting rod one (53) and the connecting rod two (54) have the same structural size.

4. The subway tunnel segment inspection device according to claim 1, characterized in that: The side plate (52) is connected to the connecting plate (51) by bolts, and the two ends of the side plate (52) are flush with the two end faces of the subway segment (6) in the axial direction.

5. A subway tunnel segment inspection device according to claim 1, characterized in that: The linear guide rails (3) are two in number and are arranged parallel to each other on the base plate (1).

6. The subway tunnel segment inspection device according to claim 1, characterized in that: One end of the linear guide (3) is flush with one end of the base plate (1), and a limit block (8) is installed on the end of the base plate (1) that is flush with the linear guide (3).

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