A device and method for detecting wear of outer coating of pipe segment by tail brush of shield

Abstract

The invention relates to a device and method for detecting the wear of a shield tail brush on an outer coating of a pipe segment, comprising a clamping mechanism and a shield tail brush fixing mechanism; the clamping mechanism comprises a clamping top beam and a clamping bottom beam arranged in parallel, which are used to clamp the pipe segment to be tested; the shield tail brush fixing mechanism comprises a shield tail brush fixing bracket which is movably connected to the clamping top beam and moves along the direction of the clamping top beam, and is used to fix the shield tail brush and simulate the movement stroke generated when the shield tail brush contacts the back side of the pipe segment; the shield tail brush to be tested is driven by the shield tail brush fixing mechanism to move along the surface of the pipe segment to be tested under set contact pressure and movement stroke; the contact pressure between the shield tail brush and the back side coating of the pipe segment is simulated by utilizing the change in the distance between the clamping top beam and the clamping bottom beam; the wear resistance of the back side coating of the pipe segment is determined by obtaining the thickness change of the back side coating of the shield tail brush to be tested as well as the corresponding contact pressure and movement stroke.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel engineering, and in particular to a device and a method for detecting wear of a shield tail brush on an outer coating of a pipe segment. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] In shield tunnel construction, due to the corrosiveness of the strata, especially municipal and railway shield tunnels in coastal and coastal areas, coatings are added to the soil-facing surface of the segments during the design and construction phase to target the corrosiveness of the strata. Although theoretically this can improve the waterproofing effect and structural durability of the tunnel itself, this method does not take into account the characteristics of shield construction. During the tunneling process of the shield machine, the shield tail brush will wear the coating on the back of the segment, which may seriously affect the performance of the coating and thus affect the long-term stability of the tunnel. At present, there is a lack of corresponding test and detection methods to understand the wear of the shield tail brush on the outer coating of the segment. Summary of the invention

[0004] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides a device and method for detecting the wear of the outer coating of a pipe segment by a shield tail brush. The wear test is carried out in a simulated experiment. The pipe segment is fixed, and the shield tail brush runs on the back of the pipe segment under different pressures and running speeds. By collecting the thickness of the coating test area on the back of the pipe segment before and after the experiment and the moving distance and contact pressure of the shield tail brush and other parameters, the wear condition of the coating is obtained, thereby providing supporting data for shield construction.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A first aspect of the present invention provides a device for detecting wear of a shield tail brush on an outer coating of a pipe segment, comprising a clamping mechanism and a shield tail brush fixing mechanism;

[0007] The clamping mechanism includes a clamping top beam and a clamping bottom beam arranged in parallel, which are used to clamp the pipe segment to be tested;

[0008] The shield tail brush fixing mechanism includes a shield tail brush fixing bracket which is movably connected to the clamping top beam and moves along the direction of the clamping top beam, and is used to fix the shield tail brush and simulate the movement stroke generated when the shield tail brush contacts the back side of the pipe segment;

[0009] The shield tail brush to be tested is driven by the shield tail brush fixing mechanism to move along the surface of the segment to be tested under the set contact pressure and movement stroke. The contact pressure between the shield tail brush and the back coating of the segment is simulated by utilizing the change in the distance between the clamping top beam and the clamping bottom beam. The wear resistance of the back coating of the segment is determined by obtaining the thickness change of the back coating of the shield tail brush to be tested as well as the corresponding contact pressure and movement stroke.

[0010] Furthermore, the clamping top beam and the clamping bottom beam are both arranged in the horizontal direction, and the space between the two is used to accommodate the pipe segment to be inspected.

[0011] Furthermore, both ends of the clamping top beam are connected to the clamping bottom beam through locking screws, and locking nuts are provided on the locking screws.

[0012] Furthermore, a movably connected shield tail brush fixing bracket is provided on the clamping top beam, the shield tail brush fixing bracket is used to fix the shield tail brush to be tested, and the shield tail brush fixing bracket is connected to the translation screw.

[0013] Furthermore, the distance between the clamping top beam and the clamping bottom beam is changed by means of a locking screw and a locking nut, so that the pipe segment to be tested is clamped and fixed.

[0014] Furthermore, the distance between the clamping top beam and the clamping bottom beam is changed by means of locking screws and locking nuts, and the distance between the shield tail brush fixed on the clamping top beam and the pipe segment is adjusted to simulate the contact pressure of the shield tail brush on the back of the pipe segment to be inspected during shield construction.

[0015] Furthermore, the clamping top beam forms a track for the movement of the shield tail brush fixing bracket. By rotating the translation screw, the shield tail brush fixing bracket and the shield tail brush move along the direction of the clamping top beam, which is used to simulate the movement stroke generated by the shield tail brush when it contacts the back side of the pipe segment during shield construction.

[0016] A second aspect of the present invention provides a method for detecting wear of a shield tail brush on an outer coating of a tube segment, comprising the following steps:

[0017] Obtain the initial coating thickness on the back of the segment to be tested;

[0018] Fix the pipe segment to be tested by using the clamping mechanism, and fix the shield tail brush by using the shield tail brush fixing mechanism, so that the coated side of the pipe segment to be tested faces the shield tail brush;

[0019] By changing the distance between the clamping top beam and the clamping bottom beam, the influence of different water and soil pressures on the contact pressure between the shield tail brush and the back of the segment at different stratum burial depths is simulated;

[0020] The shield tail brush fixing mechanism drives the shield tail brush to move along the back of the segment, simulating the scraping action of the shield tail brush on the back coating of the segment during shield construction;

[0021] After simulating the scraping action for a set number of times, the coating thickness of the wear area on the back side of the tested segment is obtained, and the wear resistance of the coating on the back side of the segment is determined based on the thickness change and the corresponding contact pressure and movement stroke.

[0022] Furthermore, the initial thickness of the coating on the back side of the tested segment is obtained, specifically, before the tested segment is clamped to the clamping mechanism, the composition of the back side coating and the initial thickness of the coating in the area where the coating is located are predetermined.

[0023] Furthermore, during the inspection, the moving speed, stroke and contact pressure of the shield tail brush are determined according to the burial depth of the formation and the maximum water and soil pressure, and the coating area, coating thickness and coating depth changes of the segment after being worn by the shield tail brush under the corresponding parameters are obtained to determine the wear of the shield tail brush on the back side coating of the segment.

[0024] Compared with the prior art, one or more of the above technical solutions have the following beneficial effects:

[0025] Wear detection is carried out in the form of simulation experiments. The pipe segment is fixed, and the shield tail brush runs on the back of the pipe segment at different contact pressures and running speeds to simulate the wear of the coating on the back of the pipe segment by the shield tail brush during the shield construction process. By collecting the thickness of the coating test area on the back of the pipe segment before and after the experiment and the moving distance and contact pressure of the shield tail brush, the wear of the coating is obtained, thereby providing supporting data for shield construction and providing a reliable evaluation method for shield tunnel construction. At the same time, it can also provide strong support for the research and development and improvement of waterproof coating materials and improve the durability of tunnel structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0027] Figure 1 It is a schematic diagram of the overall structure of a device for detecting the wear of the outer coating of a tube segment by a shield tail brush provided by one or more embodiments of the present invention;

[0028] Figure 2 It is a schematic diagram of the main structure of a device for detecting the wear of the outer coating of a pipe segment by a low-detection shield tail brush provided by one or more embodiments of the present invention;

[0029] Figure 3 It is a schematic diagram of the principle of detecting the wear of the shield tail brush on the outer coating of the pipe segment provided by one or more embodiments of the present invention.

[0030] In the figure: 1- clamping top beam, 2- clamping bottom beam, 3- shield tail brush fixing bracket, 4- shield tail brush, 5- locking screw, 6- translation screw. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0033] As introduced in the background technology, during the excavation process of the shield machine, the shield tail brush will wear the waterproof coating on the back of the segment. This wear may seriously affect the performance of the coating and thus affect the long-term stability of the tunnel. Currently, there is a lack of corresponding test and detection methods to understand the wear of the shield tail brush on the outer coating of the segment.

[0034] Therefore, the following embodiment provides a device and method for detecting the wear of the outer coating of the pipe segment by the shield tail brush. The wear test is carried out in the form of a simulation experiment. The pipe segment is fixed, and the shield tail brush runs on the back of the pipe segment under different pressures and running speeds. By collecting the thickness of the coating test area on the back of the pipe segment before and after the experiment and the moving distance, contact pressure and other parameters of the shield tail brush, the wear condition of the coating is obtained, thereby providing supporting data for shield construction.

[0035] Embodiment 1:

[0036] like Figure 1-Figure 2 As shown, a device for detecting the wear of the outer coating of the pipe segment by the shield tail brush comprises:

[0037] The clamping mechanism includes a clamping top beam 1 and a clamping bottom beam 2 arranged in parallel, which are used to clamp the pipe segment to be tested and make the back side of the pipe segment face the shield tail brush;

[0038] The shield tail brush fixing mechanism comprises a shield tail brush fixing bracket 3 which is movably connected to the clamping top beam 1 and moves along the direction of the clamping top beam 1, and is used to fix the shield tail brush to be tested;

[0039] The shield tail brush to be tested is driven by the shield tail brush fixing mechanism to move along the surface of the segment to be tested under the set contact pressure and movement stroke. The wear resistance of the coating on the back side of the segment is determined by obtaining the thickness change of the coating on the back side of the shield tail brush to be tested as well as the corresponding contact pressure and movement stroke.

[0040] In this embodiment, the clamping top beam 1 and the clamping bottom beam 2 are arranged in the horizontal direction, and the space between the two is used to accommodate the pipe segment to be tested. The two ends of the clamping top beam 1 are connected to the clamping bottom beam 2 through a locking screw 5, and the locking screw 5 is provided with a locking nut. The clamping top beam 1 is provided with a movably connected shield tail brush fixing bracket 3, which is used to fix the shield tail brush 4 to be tested, and the shield tail brush fixing bracket 3 is connected to the translation screw 6.

[0041] The distance between the clamping top beam 1 and the clamping bottom beam 2 is changed by using the locking screw 5 and the locking nut to achieve clamping. At the same time, the distance between the shield tail brush 4 fixed on the clamping top beam 1 and the pipe segment is also changed, which indirectly changes the pressure of the shield tail brush 4 on the back of the pipe segment to be tested. The clamping top beam 1 is equivalent to the track of the shield tail brush fixing bracket 3. By rotating the translation screw 6, the shield tail brush fixing bracket 3 and the shield tail brush 4 to be tested move along the direction of the clamping top beam 1, that is, move on the surface of the pipe segment to be tested, simulating the contact and wear of the shield tail brush 4 on the back of the pipe segment during shield construction.

[0042] In this embodiment, in order to ensure that the pipe segment and the shield tail brush to be tested are stable and reliable, there is no limit on the number of clamping top beams 1 and clamping bottom beams 2. Two groups of rectangular frames can be respectively used to clamp the pipe segment more reliably, and an additional group of clamping top beams 1 can be set at the position required for pipe segment detection for arranging the shield tail brush fixing bracket 3.

[0043] The functions of the various components in the device are as follows:

[0044] The clamping top beam 1 is used to fix the segment to ensure the stability of the segment during the test.

[0045] The clamping bottom beam 2 cooperates with the clamping top beam to fix the position of the pipe segment.

[0046] The shield tail brush fixing bracket 3 is used to fix the shield tail brush to ensure that the shield tail brush maintains contact with the back side of the pipe segment during the test.

[0047] The shield tail brush 4 simulates the shape and size of the shield tail brush in the actual shield construction process and is used to scrape the waterproof coating on the back of the segment.

[0048] The locking screw 5 is used to adjust the contact pressure between the shield tail brush and the back of the segment to simulate water and soil pressure conditions in different strata.

[0049] The translation screw 6 is used to adjust the scraping stroke of the shield tail brush on the back of the segment to simulate the movement trajectory of the shield tail brush during actual shield construction.

[0050] During shield construction, the shield tail brush is the component that blocks the connection between the shield machine and the outside of the segment. Generally, four tail brushes are set along the axial direction of the shield excavation to form three annular cavities. The cavities are filled with grease to form a pressurized grease ring, so that water, slurry, etc. on the back of the segment ring cannot enter the shield body.

[0051] The back side of the segment refers to the side of the segment in contact with the inner wall of the tunnel, that is, the soil side of the segment. When there is a certain degree of corrosion in the stratum (such as coastal and coastal areas), in order to ensure the service life of the soil side of the segment, a coating will be added to the back side of the segment. During the shield construction, the shield tail brush will wear the coating on the back side of the segment as the tunneling operation progresses. This embodiment simulates the process of the shield tail brush contacting and advancing with the back side of the segment to detect the wear of the coating on the back side of the segment.

[0052] By simulating the wear of the back coating of the segment by the shield tail brush during the shield construction process, the wear resistance of the segment facing the soil coating can be effectively evaluated, providing a reliable evaluation method for shield tunnel construction. At the same time, it can also provide strong support for the research and development and improvement of waterproof coating materials and improve the durability of tunnel structures.

[0053] Embodiment 2:

[0054] like Figure 3 As shown, a method for detecting the wear of the outer coating of the tube segment by the shield tail brush comprises the following steps:

[0055] Segment fixation: First, fix the segment in the test device by clamping the top beam and the bottom beam. The two clamping beams can adjust the spacing to simulate the water and soil pressure at different burial depths and adapt to the wear detection under different construction conditions.

[0056] Shield tail brush positioning: Connect the shield tail brush fixing bracket to the clamping top beam and bottom beam, and firmly connect the shield tail brush to the fixing bracket.

[0057] Simulate wear: Adjust the locking screw and locking nut to keep the shield tail brush at an appropriate distance from the back of the segment. By rotating the translation bolt, the shield tail brush starts to move along the back of the segment, simulating the scraping action of the shield tail brush on the coating in actual construction.

[0058] Linkage: The linkage between the various parts is crucial in the entire wear simulation process. The movement of the shield tail brush can be controlled by the drive device driving the translation bolt to rotate, and the contact pressure between the brush and the pipe segment is adjusted by the locking screw to ensure the accuracy of the wear simulation.

[0059] Data collection: Before and after the wear test, the wear condition of the coating was recorded by collecting parameters such as coating thickness in the coating test area, distance traveled by the shield tail brush during the wear process, and contact pressure.

[0060] Locking bolts and locking nuts are mature existing technologies. For example, in this embodiment, each locking bolt is matched with two locking nuts. The locking bolts are arranged vertically, and the two locking nuts are respectively located on the upper and lower surfaces of the clamping top beam. The locking nut located on the lower surface is used to bear the weight of the clamping top beam. After the locking nut located on the upper surface is tightened, it cooperates with the locking nut on the lower surface to clamp and fix the clamping top beam.

[0061] When reducing the distance between the clamping top beam and the clamping bottom beam, after loosening the locking nut on the lower surface of the clamping top beam to reach the set position, the locking nut on the upper surface of the clamping top beam is gradually tightened along the locking bolt, thereby pushing the clamping top beam to fall to the desired position. When increasing the distance between the clamping top beam and the clamping bottom beam, first loosen the locking nut on the upper surface of the clamping top beam to release the locking state, and then operate the locking nut on the lower surface of the clamping top beam. The specific process is not repeated in this embodiment.

[0062] The specific test steps, as well as the methods of simulating wear and evaluating wear performance are as follows:

[0063] Device calibration: According to the test requirements, adjust the distance between the clamping top beam and the bottom beam, as well as the position of the shield tail brush.

[0064] Parameter setting: according to the burial depth of the formation and the maximum water and soil pressure, set the parameters such as the moving speed, stroke and contact pressure of the shield tail brush.

[0065] Wear simulation: Start the device to make the shield tail brush move on the back of the segment according to the set parameters to simulate the actual wear process.

[0066] Data acquisition: Before and after wear, instruments are used to collect coating parameters of the test area on the soil side of the segment, including wear depth, wear area, etc. For example, the coating thickness change before and after wear can be tested by a coating thickness tester to obtain the wear depth; at the same time, the location and number of test points are not restricted; the wear area can be measured directly, or calculated after transfer using grid paper.

[0067] Data analysis: Experiments were conducted to collect data on the wear of the outer coating of the pipe segment by the brush under different pressure and speed conditions, including the coating thickness before and after wear, the travel distance of the brush, and the contact pressure. The wear depth under different test conditions was compared, the wear rate was calculated to quantify the wear speed, and statistical analysis methods were used to evaluate the significance of the differences.

[0068] Wear performance evaluation: Combine relevant industry specifications and actual engineering requirements to set the wear resistance level of the coating. Define the wear depth range corresponding to each performance level, and rate the wear resistance of the coating based on the wear depth and other performance indicators (such as hardness, elastic modulus, and chemical corrosion resistance), so as to screen out coating materials with different wear resistance levels, and then adjust and improve the coating materials that do not meet expectations.

[0069] By simulating the wear of the back coating of the segment by the shield tail brush during the shield construction process, the wear resistance of the segment facing the soil coating can be effectively evaluated, providing a reliable evaluation method for shield tunnel construction. At the same time, it can also provide strong support for the research and development and improvement of waterproof coating materials and improve the durability of tunnel structures.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for detecting the wear of the outer coating of the pipe segment by the shield tail brush, characterized in that: It includes a clamping mechanism and a shield tail brush fixing mechanism; The clamping mechanism includes a clamping top beam and a clamping bottom beam arranged in parallel, which are used to clamp the pipe segment to be tested; The shield tail brush fixing mechanism includes a shield tail brush fixing bracket which is movably connected to the clamping top beam and moves along the direction of the clamping top beam, and is used to fix the shield tail brush and simulate the movement stroke generated when the shield tail brush contacts the back side of the pipe segment; The shield tail brush to be tested is driven by the shield tail brush fixing mechanism to move along the surface of the segment to be tested under the set contact pressure and movement stroke. The contact pressure between the shield tail brush and the back coating of the segment is simulated by utilizing the change in the distance between the clamping top beam and the clamping bottom beam. The wear resistance of the back coating of the segment is determined by obtaining the thickness change of the back coating of the shield tail brush to be tested as well as the corresponding contact pressure and movement stroke.

2. A device for detecting wear of the outer coating of the tube segment by the shield tail brush as claimed in claim 1, characterized in that: The clamping top beam and the clamping bottom beam are both arranged in the horizontal direction, and the space between the two is used to accommodate the pipe segment to be inspected.

3. A device for detecting wear of the outer coating of the tube segment by the shield tail brush as claimed in claim 1, characterized in that: The two ends of the clamping top beam are connected to the clamping bottom beam through locking screws, and locking nuts are arranged on the locking screws.

4. A device for detecting wear of the outer coating of a pipe segment by a shield tail brush as claimed in claim 1, characterized in that: The clamping top beam is provided with a movably connected shield tail brush fixing bracket, the shield tail brush fixing bracket is used to fix the shield tail brush to be tested, and the shield tail brush fixing bracket is connected to the translation screw.

5. A device for detecting wear of the outer coating of a pipe segment by a shield tail brush as claimed in claim 1, characterized in that: The distance between the clamping top beam and the clamping bottom beam is changed by means of a locking screw and a locking nut, so that the pipe segment to be tested can be clamped and fixed.

6. A device for detecting wear of the outer coating of a pipe segment by a shield tail brush as claimed in claim 1, characterized in that: By changing the distance between the clamping top beam and the clamping bottom beam through the locking screw and the locking nut, the distance between the shield tail brush fixed on the clamping top beam and the segment is adjusted to simulate the contact pressure of the shield tail brush on the back of the segment to be inspected during shield construction.

7. A device for detecting wear of the outer coating of a pipe segment by a shield tail brush as claimed in claim 1, characterized in that: The clamping top beam forms a track for the movement of the shield tail brush fixing bracket. By rotating the translation screw, the shield tail brush fixing bracket and the shield tail brush move along the direction of the clamping top beam, which is used to simulate the movement stroke generated by the shield tail brush when it contacts the back side of the pipe segment during shield construction.

8. A method for detecting the wear of the outer coating of the tube segment by the shield tail brush, which is implemented based on the device according to any one of claims 1 to 7, characterized in that: The following steps are involved: Obtain the initial coating thickness on the back of the segment to be tested; Fix the pipe segment to be tested by using the clamping mechanism, and fix the shield tail brush by using the shield tail brush fixing mechanism, so that the coated side of the pipe segment to be tested faces the shield tail brush; By changing the distance between the clamping top beam and the clamping bottom beam, the influence of different water and soil pressures on the contact pressure between the shield tail brush and the back of the segment at different stratum burial depths is simulated; The shield tail brush fixing mechanism drives the shield tail brush to move along the back of the segment, simulating the scraping action of the shield tail brush on the back coating of the segment during shield construction; After simulating the scraping action for a set number of times, the coating thickness of the wear area on the back side of the tested segment is obtained, and the wear resistance of the coating on the back side of the segment is determined based on the thickness change and the corresponding contact pressure and movement stroke.

9. A method for detecting wear of the outer coating of the tube segment by the shield tail brush as claimed in claim 8, characterized in that: The initial thickness of the coating on the back of the tested segment is obtained by predetermining the composition of the back coating and the initial thickness of the coating in the area where the coating is located before the tested segment is clamped to the clamping mechanism.

10. A method for detecting wear of the outer coating of the tube segment by the shield tail brush according to claim 8, characterized in that: During the inspection, the moving speed, stroke and contact pressure of the shield tail brush are determined according to the burial depth of the formation and the maximum water and soil pressure. The coating area, coating thickness and coating depth changes of the segment after being worn by the shield tail brush under the corresponding parameters are obtained to determine the wear of the shield tail brush on the back coating of the segment.

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