Test platform for large-diameter shield segment assembly and test method thereof

Abstract

The application discloses a test platform and a test method for large-diameter shield segment assembly, which is used for simulating the vertical assembly of three-ring segments under the working condition of shield tunneling in soil, and the reaction frame is fixedly connected with the shield tail of the shield machine, so that a better tensioning stress form is formed. On the other hand, when the segment assembly is simulated, the space for assembling each ring segment is provided in the indoor environment in the mode that the shield machine does not move and the segments move, and the relative movement form of the segments and the shield is not changed. The existing idle shield machine is used to carry out the vertical assembly test of the super-large-diameter segment, which conforms to the mechanical condition in the actual construction, and meanwhile, the original assembly machine of the shield machine can be used to carry out the assembly test, which conforms to the actual engineering working condition. The application solves the problem that the existing ground segment simulation assembly adopts the horizontal assembly, and the mechanical condition of the horizontal segment assembly is different from the actual engineering working condition.

Description

Technical Field

[0001] This invention relates to the field of tunnel boring machine (TBM) construction technology, specifically to a test platform and test method for assembling large-diameter TBM segments. Background Technology

[0002] As tunnels increasingly move towards ultra-large diameter segments, the design, manufacturing, and construction of these segments introduce more uncertainties, necessitating assembly tests of ultra-large diameter shield tunnel segments. Current bottom-face segment assembly typically employs a horizontally laid assembly method. However, this method suffers from discrepancies between the mechanical properties of horizontally laid segments and actual engineering conditions. Furthermore, horizontally laid segment assembly cannot utilize assembly machines, failing to simulate the situation of a complete segment ring within the shield tail. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, a test platform and test method for assembling large-diameter shield tunnel segments are provided to solve the problem that existing ground segment simulation assembly uses flat assembly, which results in the mechanical condition of flat assembly of segments differing from the actual engineering conditions.

[0004] To achieve the above objectives, a test platform for assembling large-diameter shield tunnel segments is provided, comprising:

[0005] An ultra-large diameter tunnel boring machine is installed on the ground, and a segment assembly machine is installed at the tail of the shield of the ultra-large diameter tunnel boring machine;

[0006] The temporary rear support is detachably installed on the inner wall of the shield tail, and the temporary rear support can be set behind the segment assembly machine;

[0007] A reaction frame fixed to the tail of the shield includes an upper support, a lower support, and two side supports. The upper support, the lower support, and the two side supports are arranged along the circumferential direction of the tail of the shield. The upper support and the lower support are arranged opposite to each other. The side supports are arranged between the upper support and the lower support. The upper support, the lower support, and the two side supports enclose a clamping space for embedding the first ring segment. The inner side of the upper support, the lower support, and the two side supports, away from the tail of the shield, has a limiting flange for abutting against the first ring segment. A connecting beam is connected between the limiting flanges of the two side supports. A top support is detachably installed on the side of the limiting flange facing the tail of the shield.

[0008] Furthermore, the upper support, the lower support, and the side support are arc-shaped.

[0009] Furthermore, a support frame is provided between the outer arc surface of the side support and the ground.

[0010] Furthermore, the support frame includes:

[0011] The base plate, the lower support is fixed to the ground, and the base plates of the support frames of the two side supports are respectively disposed at opposite ends of the lower support;

[0012] Multiple diagonal braces are connected between the outer arc surfaces of the base plate and the side support.

[0013] Furthermore, the length of the top support is adapted to the width of the segment.

[0014] Furthermore, the top support component is arranged in the same direction as the tunnel boring machine.

[0015] Furthermore, the end of the temporary rearward section away from the inner wall of the shield tail is formed with a pressing part for abutting against the inner arc surface of the tube segment.

[0016] This invention provides a test method for a test platform used in the assembly of large-diameter shield tunnel segments, comprising the following steps:

[0017] The segment assembly machine at the tail of the ultra-large diameter shield machine assembles the first ring segment inside the tail of the shield. The propulsion cylinder of the ultra-large diameter shield machine pushes the first ring segment to a temporary backrest, so that the temporary backrest abuts against the side of the first ring segment away from the propulsion cylinder.

[0018] Remove the temporary support structure;

[0019] The propulsion cylinder continues to extend the width of the first ring segment, pushing the first ring segment against the top support, so that the top support abuts against one side of the first ring segment;

[0020] The segment assembly machine assembles the second ring of segments on the other side of the first ring of segments;

[0021] The propulsion cylinder retracts and removes the top support;

[0022] The propulsion cylinder pushes against the second ring segment, so that the first ring segment is embedded in the clamping space formed by the upper support, lower support and side supports of the reaction frame, and the limiting flange abuts against one side of the first ring segment.

[0023] The segment assembly machine assembles the third ring segment on the other side of the second ring segment.

[0024] The beneficial effects of this invention are as follows: The test platform for assembling large-diameter shield tunnel segments is used to simulate the vertical assembly of three-ring segments under the working conditions of a shield machine excavating in soil. The reaction frame is fixedly connected to the tail of the shield machine, forming a better tensile force distribution. On the other hand, during the simulated segment assembly, in an indoor environment, the shield machine does not move while the segments move, providing space for assembling each ring of segments. The relative motion between the segments and the shield remains unchanged. Using an existing idle shield machine to conduct vertical assembly tests of ultra-large diameter segments conforms to the mechanical conditions during actual construction. At the same time, the existing assembly machine of the shield machine can be used for assembly tests, which conforms to actual engineering conditions. In addition, the posture and deformation of the segments inside the tail of the shield machine can be conveniently and intuitively detected. Attached Figure Description

[0025] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0026] Figure 1 This is a schematic diagram of the structure of the test platform for assembling large-diameter shield tunnel segments according to an embodiment of the present invention.

[0027] Figure 2 This is a cross-sectional view of a test platform for assembling large-diameter shield tunnel segments according to an embodiment of the present invention.

[0028] Figures 3 to 9 This is a schematic diagram illustrating the steps of a test method for a test platform used for assembling large-diameter shield tunnel segments according to an embodiment of the present invention. Detailed Implementation

[0029] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] Reference Figures 1 to 9 As shown, the present invention provides a test platform for assembling large-diameter shield tunnel segments, including: an ultra-large diameter shield machine, a temporary support 2, and a reaction frame 3.

[0032] The ultra-large diameter tunnel boring machine (TBM) is an idle ultra-large diameter TBM. The ultra-large diameter TBM is installed on the ground. It is fixed to the ground to prevent relative movement between the TBM and the ground. The tail section 1 of the ultra-large diameter TBM is equipped with a segment assembler 11 and a propulsion cylinder 12. In this embodiment, the central axis of the ultra-large diameter TBM is set horizontally to simulate the working conditions of the TBM during tunneling in soil. The ultra-large diameter TBM has corresponding components for segment assembly; since the specific structure of the ultra-large diameter TBM is existing technology, it will not be described in detail here.

[0033] The temporary support 2 is detachably installed on the inner wall of the tail shield 1. The temporary support can be positioned behind the segment assembly machine 11. In this embodiment, there are multiple temporary supports. These multiple temporary supports are spaced apart along the circumference of the tunnel boring machine.

[0034] Preferably, temporary backstops are evenly spaced along the circumference of the shield tail. The distance between two adjacent temporary backstops is less than the length of a single tunnel segment.

[0035] The reaction frame 3 is fixed to the tail of the shield 1.

[0036] Specifically, the reaction frame 3 includes an upper support 31, a lower support 32, a side support 33, a limiting flange 34, a connecting beam 35, and a top support 36.

[0037] The upper support 31, the lower support 32, and the two side supports 33 are arranged along the circumferential direction of the shield tail 1.

[0038] The upper support 31 and the lower support 32 are arranged opposite to each other. (See reference...) Figure 1 As shown, the upper support is positioned above the lower support. There are two side supports. Each side support 33 is positioned between the upper support 31 and the lower support 32. The upper support 31, the lower support 32, and the two side supports 33 together form a clamping space for the first ring segment a to be embedded.

[0039] A limiting flange 34 is formed on the inner side of the upper support 31, lower support 32, and side supports 33 away from the shield tail 1. The limiting flange 34 is used to abut against the first ring segment a. Specifically, each ring segment has opposite sides.

[0040] See Figure 3 As shown, the temporary backrest 2 is used to abut against the side of the first ring segment a away from the propulsion cylinder 12. (See reference...) Figure 9 As shown, the limiting flange 34 is used to abut against one side of the first ring segment a.

[0041] Continue reading Figure 1 As shown, a connecting beam 35 is connected between the limiting flanges 34 of the two side supports 33.

[0042] See Figure 4 and Figure 5 As shown, a top support 36 is detachably mounted on the side of the limiting flange 34 facing the tail 1. The top support 36 is used to abut against one side of the first ring segment a.

[0043] In this embodiment, the ultra-large diameter tunnel boring machine (TBM) is mainly used to simulate the vertical assembly of three-ring tunnel segments. The length of the top support member 36 is adapted to the width of the tunnel segment. The top support member 36 is set in the same direction as the TBM. The distance between the temporary rear support member and the top support member is the width of one tunnel segment. There are multiple top support members. Multiple top support members are arranged in a circle along the circumference of the shield tail. The multiple top support members are spaced apart.

[0044] After the segment assembly machine assembles the first ring of segments, a temporary backrest is placed against one side of the first ring of segments. After the second ring of segments is assembled, the temporary backrest is removed, and the top support rests against one side of the first ring of segments. After the third ring of segments is assembled, the top support is removed, and the limiting flange rests against one side of the first ring of segments. By setting temporary backrests and top supports segment by segment at the shield tail, reaction force is provided for the segments.

[0045] In a preferred embodiment, a pressing part 21 is formed at the end of the temporary backrest 2 that is away from the inner wall of the shield tail 1. The pressing part 21 is used to abut against the inner arc surface of the tube segment. The temporary backrest 2 and the pressing part 21 are integrally formed and are generally L-shaped.

[0046] In a preferred embodiment, the upper support 31, lower support 32, and side support 33 are arc-shaped. The upper support 31, lower support 32, and side support 33 are elongated. The upper support 31, lower support 32, and side support 33 are respectively arranged along the circumferential direction of the shield tail. A wall-mounted plate is connected to the side of the upper support 31, lower support 32, and side support 33 closest to the shield tail.

[0047] The wall plates of the upper support 31, lower support 32 and side support 33 are fixedly connected to the outer wall of the shield tail by bolts or welding, so that the inner side surfaces of the upper support 31, lower support 32 and side support 33 are flush with the inner wall of the shield tail. The inner side surfaces of the upper support 31, lower support 32 and side support 33 enclose the clamping space, and then after the propulsion cylinder pushes out a ring, it is embedded in the clamping space.

[0048] A support frame 4 is provided between the outer arc surface of the side support 33 and the ground.

[0049] For details, please refer to Figure 3 As shown, the support frame 4 includes a base plate 41 and a diagonal brace 42.

[0050] In this embodiment, the lower support 32 is fixed to the ground. The base plates of the support frames 4 of the side supports 33 are respectively disposed at opposite ends of the lower support 32. The diagonal brace connects the base plate and the outer arc surface of the side support 33.

[0051] There are multiple diagonal braces. These multiple diagonal braces are spaced apart along the outer edge of the substrate. The multiple diagonal braces are arranged in the same direction. The lengths of the multiple diagonal braces are different.

[0052] Reference Figures 3 to 9 As shown, the present invention provides a test method for a test platform used for assembling large-diameter shield tunnel segments, comprising the following steps:

[0053] S1: The segment assembly machine 11 of the tail 1 of the ultra-large diameter shield machine assembles the first ring segment a inside the tail 1. The propulsion cylinder 12 of the ultra-large diameter shield machine pushes the first ring segment a to the temporary backrest 2, so that the temporary backrest 2 abuts against the side of the first ring segment a away from the propulsion cylinder 12.

[0054] S2: Remove temporary support 2.

[0055] S3: The propulsion cylinder 12 continues to extend the width of the first ring segment a, pushing the first ring segment a against the top support 36, so that the top support 36 abuts against one side of the first ring segment a.

[0056] S4: The segment assembly machine 11 assembles the second ring segment b on the other side of the first ring segment a.

[0057] S5: Push the hydraulic cylinder 12 to retract and remove the top support 36.

[0058] S6: The propulsion cylinder 12 pushes against the second ring segment b, so that the first ring segment a is embedded in the clamping space formed by the upper support 31, the lower support 32 and the two side supports 33 of the reaction frame 3, and the limiting flange 34 abuts against one side of the first ring segment a.

[0059] S7: The segment assembly machine 11 assembles the third ring segment c on the other side of the second ring segment b.

[0060] This invention provides a test platform for assembling large-diameter tunnel boring machine (TBM) segments. This platform simulates the vertical assembly of three-ring segments under TBM tunneling conditions within soil. The reaction frame is fixedly connected to the TBM tail, forming a favorable tension-resistance configuration. Furthermore, during the simulated segment assembly in an indoor environment, the TBM remains stationary while the segments move, providing space for each ring of segments. The relative motion between the segments and the TBM remains unchanged. Utilizing an existing idle TBM for the vertical assembly test of ultra-large diameter segments aligns with the mechanical conditions of actual construction. Simultaneously, it allows for the use of the TBM's existing assembly machine for assembly tests, reflecting actual engineering conditions. Moreover, it provides a convenient and intuitive way to monitor the posture and deformation of the segments within the TBM tail.

[0061] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A test platform for assembling large-diameter shield tunnel segments, characterized in that, include: An ultra-large diameter tunnel boring machine is installed on the ground, and a segment assembly machine is installed at the tail of the shield of the ultra-large diameter tunnel boring machine; A temporary support is detachably installed on the inner wall of the shield tail, and the temporary support is located behind the segment assembly machine; A reaction frame fixed to the tail of the shield includes an upper support, a lower support, and two side supports. The upper support, the lower support, and the two side supports are arranged along the circumferential direction of the tail of the shield. The upper support and the lower support are arranged opposite each other. The side supports are arranged between the upper support and the lower support. The upper support, the lower support, and the two side supports enclose a clamping space for embedding the first ring segment. The inner side of the upper support, the lower support, and the two side supports, away from the tail of the shield, has a limiting flange for abutting against the first ring segment. A connecting beam connects the limiting flanges of the two side supports. A top support is detachably installed on the side of the limiting flange facing the tail of the shield. The length of the top support is adapted to the width of the segment. The top support is arranged in the same direction as the shield machine. The distance between the top support and the shield machine when temporarily leaning back is the width of one segment.

2. The test platform for assembling large-diameter shield tunnel segments according to claim 1, characterized in that, The upper support, the lower support, and the side support are arc-shaped.

3. The test platform for assembling large-diameter shield tunnel segments according to claim 2, characterized in that, A support frame is provided between the outer arc surface of the side support and the ground.

4. The test platform for assembling large-diameter shield tunnel segments according to claim 3, characterized in that, The support frame includes: The base plate, the lower support is fixed to the ground, and the base plates of the support frames of the two side supports are respectively disposed at opposite ends of the lower support; Multiple diagonal braces are connected between the outer arc surfaces of the base plate and the side support.

5. The test platform for assembling large-diameter shield tunnel segments according to claim 1, characterized in that, The length of the top support is adapted to the width of the segment.

6. The test platform for assembling large-diameter shield tunnel segments according to claim 1, characterized in that, The top support component is arranged in the same direction as the tunnel boring machine.

7. The test platform for assembling large-diameter shield tunnel segments according to claim 1, characterized in that, The temporary rearward end of the inner wall away from the shield tail has a pressing part for abutting against the inner arc surface of the tube segment.

8. A test method for a test platform for assembling large-diameter shield tunnel segments as described in any one of claims 1 to 7, characterized in that, Includes the following steps: The segment assembly machine at the tail of the ultra-large diameter shield machine assembles the first ring segment inside the tail of the shield. The propulsion cylinder of the ultra-large diameter shield machine pushes the first ring segment to a temporary backrest, so that the temporary backrest abuts against the side of the first ring segment away from the propulsion cylinder. Remove the temporary support structure; The propulsion cylinder continues to extend the width of the first ring segment, pushing the first ring segment against the top support, so that the top support abuts against one side of the first ring segment; The segment assembly machine assembles the second ring of segments on the other side of the first ring of segments; The propulsion cylinder retracts and removes the top support; The propulsion cylinder pushes against the second ring segment, so that the first ring segment is embedded in the clamping space formed by the upper support, lower support and side supports of the reaction frame, and the limiting flange abuts against one side of the first ring segment. The segment assembly machine assembles the third ring segment on the other side of the second ring segment.

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