Measurement device for deformation opening amount of model tunnel joint

Abstract

The utility model discloses a device for measuring the deformation opening amount of a model tunnel joint, which relates to the field of tunnel construction and comprises a plurality of pipe pieces, the plurality of pipe pieces are mutually connected to form an annular tunnel, and the top of the annular tunnel is fixedly provided with a strain gauge for measuring the deformation opening amount of the joint of the pipe pieces. According to the utility model, the problem that the deformation of the tunnel joint is difficult to measure in a civil engineering model test is effectively solved, and the precision of measuring the deformation of the joint is improved.

Description

Technical Field

[0001] The utility model relates to the field of tunnel construction, in particular to a device for measuring the deformation and opening amount of a model tunnel joint. Background Art

[0002] Tunnels are engineering structures buried in the ground and are a form of human use of underground space. Sufficient preparation is required before tunnel construction. The most common preparation is to build a model tunnel and measure the deformation and opening of the joints of the model tunnel, so as to evaluate the waterproof performance of the tunnel based on the data results and adjust and improve the overall structure of the tunnel based on the corresponding experimental data.

[0003] At present, the deformation of the joints in the tunnel model test is mainly obtained by manual means. The measurement personnel need to approach the joints and then use tools such as feeler gauges and vernier calipers to measure. The inaccessible areas become detection blind spots, and human errors have a greater impact on the measured results. In summary, the manual contact measurement method has the disadvantages of cumbersome detection process, low detection efficiency, limited detection range, and low degree of digitization. It is necessary to study a faster and more efficient joint opening detection method. Utility Model Content

[0004] In view of the problems in the related technology, the utility model proposes a device for measuring the deformation and opening amount of a model tunnel joint to overcome the above technical problems existing in the existing related technology.

[0005] To this end, the specific technical solutions adopted by the utility model are as follows:

[0006] A device for measuring the deformation and opening of a model tunnel joint comprises a pipe segment. The pipe segments are multiple and connected to form an annular tunnel. A strain gauge for measuring the deformation and opening at the pipe segment joint is fixedly installed on the top of the annular tunnel.

[0007] As a preferred solution for a device for measuring the deformation and opening amount of a model tunnel joint, the strain gauge is fixed to the annular tunnel by gluing or clamping. When the strain gauge is fixed by clamping, the annular tunnel consists of two extension sheets and a plurality of pipe sheets, and one end of each of the two extension sheets is provided with a connecting head. The two extension sheets are distributed in a mirror-symmetrical manner with the connecting head as the center of symmetry. A clamping assembly is commonly provided on the top of the two connecting heads, and a strain gauge is fixedly installed on the top of the clamping assembly.

[0008] As a preferred solution of a device for measuring the deformation and opening amount of a model tunnel joint, the clamping assembly includes two right-angle plates installed on both sides of the two connecting heads, and the two right-angle plates are distributed in a mirror-symmetrical manner with the connecting head as the center of symmetry. The two right-angle plates are pressed against the side walls of the two adjacent connecting heads through a fastening assembly, and the tops of the two right-angle plates are fixedly connected to the strain gauge through the fastening assembly.

[0009] As a preferred solution of a device for measuring the deformation and opening amount of a model tunnel joint, a plurality of step holes are provided on the side wall of the right-angle plate.

[0010] As a preferred solution of a device for measuring the deformation and opening amount of a model tunnel joint, the fastening assembly includes a plurality of screws and nuts corresponding thereto, wherein two of the screws penetrate through the side walls of the two right-angle plates and are threadedly connected to the corresponding nuts, and the remaining screws penetrate through the strain gauge and the bottom plates of the two right-angle plates and are threadedly connected to the corresponding nuts.

[0011] As a preferred solution of a device for measuring the deformation and opening amount of a model tunnel joint, a protective pad is provided at the connection between the right-angle plate and the strain gauge.

[0012] As a preferred solution of a device for measuring the deformation and opening amount of a model tunnel joint, the strain gauge adopts a 150AA strain gauge.

[0013] The beneficial effects of the utility model are as follows: the utility model provides a device for measuring the deformation and opening amount of a model tunnel joint. The device fixes a strain gauge on a pipe segment across the joint along its length direction, and only fixes two end points of the strain gauge. Since the deformation of the model tunnel pipe segment itself is much smaller than the deformation at the pipe segment joint, the displacement calculated by the strain gauge is the deformation of the model tunnel joint. The device effectively solves the problem that the deformation of the tunnel joint is difficult to measure in a civil engineering model test, and improves the accuracy of measuring the joint deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the pasting of the strain gauge in the utility model;

[0016] Figure 2 It is a schematic diagram of clamping the strain gauge in the utility model;

[0017] Figure 3 for Figure 2 A is an enlarged schematic diagram;

[0018] Figure 4 It is a schematic diagram of the pipe segment of the utility model;

[0019] Figure 5 It is a schematic diagram of a right-angle plate of the utility model.

[0020] In the figure: 1. pipe segment; 2. connecting head; 3. annular tunnel; 4. clamping assembly; 5. strain gauge; 6. right-angle plate; 7. fastening assembly; 8. step hole; 9. screw; 10. nut; 11. extension plate; 12. protective pad. DETAILED DESCRIPTION

[0021] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments. They can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in the field should be able to understand other possible implementation methods and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0022] In order to facilitate understanding of the above technical solution of the present invention, the working principle or operation method of the present invention in the actual process is described in detail below.

[0023] like Figures 1 to 5 As shown, a device for measuring the deformation and opening amount of a model tunnel joint includes a pipe segment 1. There are multiple pipe segments 1, and the multiple pipe segments 1 are interconnected to form an annular tunnel 3. A strain gauge 5 for measuring the deformation and opening amount at the joint of the pipe segment 1 is fixedly installed on the top of the annular tunnel 3.

[0024] As a preferred solution for a device for measuring the deformation and opening amount of a model tunnel joint, the strain gauge 5 and the annular tunnel 3 are fixed by adhesion or clamping. When the strain gauge 5 is fixed by clamping, the annular tunnel 3 consists of two extension sheets 11 and multiple pipe sheets 1. There are two extension sheets 11, and one end of each of the two extension sheets 11 is provided with a connector 2. The two extension sheets 1 are distributed in a mirror-symmetrical manner with the connector 2 as the center of symmetry. A clamping assembly 4 is commonly provided on the top of the two connectors 2, and a strain gauge 5 is fixedly installed on the top of the clamping assembly 4.

[0025] Specifically, in traditional engineering mechanics research experiments, strain gauge 5 is a sensor used to measure the strain of an object. The working principle of strain gauge 5 is that after applying stress to an object using external force, the length and shape of the object will change. Strain gauge 5 is usually fixed on the surface of the object that needs to measure the strain, so strain gauge 5 will undergo slight displacement and deformation. This causes the resistance value inside strain gauge 5 to change. Strain gauge 5 is often connected to a bridge circuit. By measuring the resistance change on the bridge circuit, the slight displacement and strain of strain gauge 5 can be indirectly measured. In traditional tunnel model testing, manual methods are often used to measure and record the deformation generated at the joints of the tunnel model. In the process of manual data collection, the measurement personnel need to approach the joints and then use tools such as feeler gauges and vernier calipers to measure. The inaccessible areas become detection blind spots. At the same time, human errors have a greater impact on the measured results. Therefore, in the utility model, a strain gauge 5 is fixedly installed at the joints in the annular tunnel 3, so that the strain gauge 5 is fixed on the pipe segment 1 across the joint along its length direction. The strain gauge 5 only has two end points fixed. Since the deformation of the model tunnel pipe segment 1 itself is much smaller than the deformation at the joint of the pipe segment 1, a data acquisition instrument is externally connected to one end of the strain gauge 5, and the displacement data calculated by the measured strain is the deformation data of the model tunnel joint. In the utility model, when the strain gauge 5 is fixed by clamping, since the annular tunnel 3 is composed of two extension sheets 11 and a plurality of pipe segments 1 connected to each other, when the annular tunnel 3 is subjected to external pressure, the displacement generated at the connection between the pipe segment 1 and the extension sheet 11 is much larger than the deformation generated by the pipe segment 1 and the extension sheet 11 itself, so the clamping assembly 4 is fixedly arranged on both sides of two adjacent groups of connectors 2. When the annular tunnel 3 is subjected to force, the annular tunnel 3 is more likely to be displaced from the joints or other connections of the two groups of connectors 2. Therefore, the strain gauge 5 fixed on the top of the clamping assembly 4 will be deformed by the torsional force generated by the displacement of the connector 2, thereby monitoring the resistance change of the bridge circuit on the strain gauge 5 to measure the deformation opening of the annular tunnel 3, effectively solving the problem of difficulty in measuring the deformation of tunnel joints in civil engineering model tests, and improving the accuracy of measuring joint deformation.

[0026] As a preferred solution for a device for measuring the deformation and opening amount of a model tunnel joint, the clamping assembly 4 includes two right-angle plates 6 installed on both sides of the two connecting heads 2, and the two right-angle plates 6 are distributed in a mirror-symmetrical manner with the connecting head 2 as the symmetry center. The two right-angle plates 6 are pressed against the side walls of the two adjacent connecting heads 2 through a fastening assembly 7, and the tops of the two right-angle plates 6 are fixedly connected to the strain gauge 5 through the fastening assembly 7.

[0027] As a preferred solution of a device for measuring the deformation and opening amount of a model tunnel joint, a plurality of step holes 8 are provided on the side wall of the right-angle plate 6 .

[0028] As a preferred solution of a device for measuring the deformation and opening amount of a model tunnel joint, the fastening assembly 7 includes a plurality of screw rods 9 and nuts 10 corresponding thereto, wherein two screw rods 9 penetrate through the side walls of the two right-angle plates 6 and are threadedly connected to the nuts 10 corresponding thereto, and the remaining screw rods 9 penetrate through the strain gauge 5 and the bottom plates of the two right-angle plates 6 and are threadedly connected to the nuts 10 corresponding thereto.

[0029] Specifically, as a device for measuring the deformation and opening amount of a model tunnel joint, in the process of conducting various experiments on different tunnel models, the strain gauge 5 needs to be repeatedly fixed, and the traditional adhesive fixing method is relatively simple, and it is difficult to take out the fixed strain gauge 5 again, and the fixing point is too random. As an experimental scheme for a small deformation test, the fixing point of the strain gauge 5 has a great influence on the test result. Therefore, the screw 9 and the nut 10 are connected to perform threaded fixing, and the strain gauge 5 can be quickly recovered after the experiment. At the same time, it ensures that the right-angle plate 6 can fit tightly on both sides of the connector 2 when fixed, so that the strain gauge 5 can record the deformation and opening amount of the annular tunnel 3.

[0030] As a preferred solution of a device for measuring the deformation and opening amount of a model tunnel joint, a protective pad 12 is provided at the connection between the right-angle plate 6 and the strain gauge 5 .

[0031] As a preferred solution of a device for measuring the deformation and opening amount of a model tunnel joint, the strain gauge 5 adopts a 150AA strain gauge 5 .

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for measuring deformation and opening of a model tunnel joint, comprising a segment (1), characterized in that: There are a plurality of pipe segments (1), and the plurality of pipe segments are interconnected to form an annular tunnel (3). A strain gauge (5) for measuring the deformation and opening amount at the joints of the pipe segments (1) is fixedly installed on the top of the annular tunnel (3).

2. A device for measuring deformation and opening of a model tunnel joint according to claim 1, characterized in that: The strain gauge (5) and the annular tunnel (3) are fixed by gluing or clamping. When the strain gauge (5) is fixed by clamping, the annular tunnel (3) is composed of two extension sheets (11) and a plurality of pipe sheets (1), and one end of each of the two extension sheets (11) is provided with a connector (2). The two extension sheets (11) are distributed in a mirror-symmetrical manner with the connector (2) as a symmetry center. A clamping assembly (4) is commonly provided at the top of the two connectors (2), and a strain gauge (5) is fixedly mounted on the top of the clamping assembly (4).

3. A device for measuring deformation and opening of a model tunnel joint according to claim 2, characterized in that: The clamping assembly (4) comprises two right-angle plates (6) mounted on both sides of the two connecting heads (2), and the two right-angle plates (6) are distributed in a mirror-symmetrical manner with the connecting head (2) as the symmetry center. The two right-angle plates (6) are pressed against the side walls of two adjacent connecting heads (2) through a fastening assembly (7), and the tops of the two right-angle plates (6) are fixedly connected to the strain gauge (5) through the fastening assembly (7).

4. A device for measuring deformation and opening of a model tunnel joint according to claim 3, characterized in that: A plurality of step holes (8) are provided on the side wall of the right-angle plate (6).

5. The device for measuring deformation and opening of a model tunnel joint according to claim 3, characterized in that: The fastening assembly (7) comprises a plurality of screw rods (9) and nuts (10) matched thereto, wherein two of the screw rods (9) penetrate the side walls of the two right-angle plates (6) and are threadedly connected to the corresponding nuts (10), and the remaining screw rods (9) penetrate the strain gauge (5) and the two right-angle plates (6) and are threadedly connected to the corresponding nuts (10).

6. The device for measuring deformation and opening of a model tunnel joint according to claim 3, characterized in that: Protection pads (12) are provided at the connection points between the two right-angle plates (6) and the strain gauge (5).

7. The device for measuring deformation and opening of a model tunnel joint according to claim 1, characterized in that: The strain gauge (5) adopts a 150AA strain gauge (5).

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