A fatigue strength testing device for shield segments

Abstract

The present application relates to a fatigue strength testing device for shield segments, comprising a segment positioning support part, a pressurizing vibration part and a split isolation part, the segment positioning support part comprising an arc-shaped support seat and a plurality of support rollers, the arc-shaped support seat having an arc-shaped support surface, the plurality of support rollers being arranged at intervals along the circumference of the arc-shaped support surface, and the support rollers being able to rotate relative to and move relative to the arc-shaped support surface; the pressurizing vibration part comprising an arc-shaped pressurizing seat and a vibration mechanism, the arc-shaped pressurizing seat being able to face the arc-shaped support surface and move along a first direction, and the vibration mechanism being able to move along the first direction and partially pass through the arc-shaped support surface; the split isolation part is located on both sides of the segment positioning support part along the length direction, the split isolation part comprising a movable support arc plate, a protective cover and a spray mechanism, the movable support arc plates of the two split isolation parts being able to move axially along the arc-shaped support surface and abut against each other, the spray mechanism being arranged on the inner wall of the protective cover, and the protective cover being able to cover the segment positioning support part.

Description

Technical Field

[0001] The present application relates to the technical field of shield segment detection, and in particular to a fatigue strength testing device for shield segments. Background Art

[0002] The shield segment is the main assembly component of shield construction and the innermost barrier of the tunnel. It is responsible for resisting soil pressure, groundwater pressure and some special loads. As the permanent lining structure of the shield tunnel, the quality of the shield segment is directly related to the overall quality and safety of the tunnel, affecting the waterproof performance and durability of the tunnel. Before the shield segments are produced and shipped, they need to be tested for fatigue strength to ensure the quality and performance of the segments and guarantee the safety and durability of the tunnel structure. In the related art, when testing the fatigue strength of the shield segments, due to the large weight of the shield segments and the fact that the strength of the shield segments themselves is affected by the moisture content inside them, it is not easy to control the test conditions of the shield segments when using equipment to test the shield segments, and it is not easy to simulate the vibrations that the shield segments are subjected to during application. Summary of the Invention

[0003] The present application provides a fatigue strength testing device for shield segments, which can perform fatigue strength testing on shield segments before leaving the factory, thereby effectively avoiding quality problems caused by loads and vibrations on the shield segments during actual use in tunnels.

[0004] The fatigue strength testing equipment for shield segments provided in the present application comprises: a segment positioning support portion, the segment positioning support portion comprising an arcuate support seat and a plurality of support rollers, the arcuate support seat having an arcuate support surface, the plurality of support rollers being arranged at intervals along the circumference of the arcuate support surface, and the support rollers being capable of rotating relative to the arcuate support surface, and moving relative to the arcuate support surface to partially expose the arcuate support surface or retract and separate from the arcuate support surface;

[0005] a pressurizing and vibrating portion, the pressurizing and vibrating portion comprising an arc-shaped pressurizing seat and a vibrating mechanism, the arc-shaped pressurizing seat being located above the arc-shaped support seat, the arc-shaped pressurizing seat being capable of facing the arc-shaped support surface and moving along a first direction to apply a load, the vibrating mechanism being located below the arc-shaped support seat, the vibrating mechanism being capable of moving along the first direction and partially passing through the arc-shaped support surface, the first direction being a height direction of the arc-shaped support seat;

[0006] The split isolation part is located on both sides of the pipe segment positioning support part along the length direction. The split isolation part includes a movable support arc plate, a protective cover and a spray mechanism. The movable support arc plates of the two split isolation parts can move axially along the arc support surface and abut against each other. The spray mechanism is arranged on the inner wall of the protective cover. The protective cover can move axially along the arc support surface and cover the pipe segment positioning support part.

[0007] In addition, the fatigue strength testing equipment for shield segments provided in this application may also have the following additional technical features:

[0008] In an optional solution, the segment positioning support portion further includes a support base, a transmission mounting seat and a first driving member; the support base is located at the bottom of the arc-shaped support seat, the transmission mounting seat is arranged in pairs on the support base, and the top of the transmission mounting seat is an arc-shaped inclined surface, the support roller is rotatably arranged on the transmission mounting seat, the first driving member is transmission-connected to the transmission mounting seat, and the first driving member can drive the transmission mounting seat to move along the width direction of the arc-shaped support seat.

[0009] In an optional solution, the first driving member includes a transmission motor and a transmission screw, the length direction of the transmission screw extends along the width direction of the arc-shaped support seat, and the transmission screw has a positive thread segment and a negative thread segment with opposite rotation directions, the two transmission mounting seats arranged in pairs are respectively threadedly connected to the positive thread segment and the negative thread segment of the transmission screw, and the output end of the transmission motor is connected to the transmission screw.

[0010] In an optional solution, the segment positioning support portion further includes a plurality of universal wheels and a plurality of first adjustment handles, wherein the first adjustment handles are arranged in the arc-shaped support seat, and the universal wheels are transmission-connected to the first adjustment handles, and the first adjustment handles can drive the universal wheels to be partially exposed outside the support base and retracted into the support base.

[0011] In an optional scheme, the vibration mechanism includes a vibration transmission seat, a vibration motor, a supporting wedge and a second hydraulic cylinder; the vibration transmission seat is located below the arc-shaped supporting surface, the vibration transmission seat includes a plurality of raised vibration columns, the vibration columns can pass through the arc-shaped supporting surface, the vibration motor is provided on both sides of the vibration transmission seat, the second hydraulic cylinder is located on both sides of the vibration transmission seat, and the telescopic end of the second hydraulic cylinder is connected to the supporting wedge to push the vibration transmission seat to move along the first direction.

[0012] In an optional scheme, the pressurizing vibration part also includes a cylinder support frame and a first hydraulic cylinder, the side wall of the arc-shaped support seat is provided with at least one guide slide along the length direction, the cylinder support frame is slidingly connected to the guide slide, the first hydraulic cylinder is arranged on the cylinder support frame, the telescopic end of the first hydraulic cylinder is connected to the arc-shaped pressurizing seat, and the arc-shaped pressurizing seat has an arc-shaped pressurizing surface that can fit with the arc-shaped support surface.

[0013] In an optional solution, the pressurized vibration part also includes a guide column and a second adjustment handle; one end of the guide column is connected to the arc-shaped pressurized seat, and the guide column can slide relative to the cylinder support frame, and the second adjustment handle is threadedly connected to the cylinder support frame, and the second adjustment handle can lock the cylinder support frame at a preset position of the arc-shaped support seat.

[0014] In an optional solution, the protective cover is slidably connected to the side wall of the arc-shaped support seat; the split isolation part also includes a guide sleeve, a connecting slide rod and a limit ring, the limit ring connects one end of the guide sleeve and one end of the connecting slide rod, the other end of the guide sleeve is connected to the protective cover, and the other end of the connecting slide rod is connected to the movable support arc plate, and the bottom of the movable support arc plate is attached to the arc-shaped support surface.

[0015] In an optional solution, the spray mechanism includes a spray rack and a plurality of spray heads, the spray rack is provided on the protective cover, and the plurality of spray heads are arranged at intervals along the length direction of the spray rack.

[0016] In an optional solution, the split isolation part further includes a guide wheel, which is arranged at the bottom of the protective cover, and the moving direction of the guide wheel is the axial direction of the arc-shaped supporting surface.

[0017] The beneficial effects of this application are:

[0018] When the fatigue strength testing equipment in this application is used to test the fatigue strength of shield segments, the support rollers can be used to roll the placed shield segments, allowing the shield segments to be stably pressurized and vibrated after centering. At the same time, the spray mechanism can adjust the humidity of the simulated environment to improve the accuracy of the test results and reduce the impact of the shield segments' own moisture content. This fatigue strength testing equipment effectively avoids quality problems caused by loads and vibrations when the shield segments are actually used in tunnels by testing the fatigue strength of the shield segments before they leave the factory.

[0019] It should be understood that the foregoing general description and the following detailed description are merely illustrative and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the overall structure of the fatigue strength testing equipment provided for this application;

[0021] Figure 2 for Figure 1 Schematic diagram of the planar structure of the medium fatigue strength testing equipment;

[0022] Figure 3 for Figure 2 A schematic diagram of the enlarged structure at point A;

[0023] Figure 4 A schematic diagram of the partial structure of the fatigue strength testing equipment provided for this application;

[0024] Figure 5 This is a schematic diagram of the cross-sectional structure of the fatigue strength testing equipment provided in this application at the support roller;

[0025] Figure 6 This is a schematic diagram of the three-dimensional structure of the pipe segment positioning support part provided in this application.

[0026] Figure markings: segment positioning support part 1, arc-shaped support seat 11, support base 12, transmission screw 13, guide slide 14, universal wheel 15, first adjustment handle 16, transmission mounting seat 17, support roller 18, transmission motor 19, pressurized vibration part 2, cylinder support frame 21, first hydraulic cylinder 22, guide column 23, arc-shaped pressurizing seat 24, vibration transmission seat 25, vibration motor 26, support bevel block 27, second hydraulic cylinder 28, second adjustment handle 29, split isolation part 3, protective cover 31, spray frame 32, guide wheel 33, guide sleeve 34, limiting ring 35, connecting slide rod 36, movable support arc plate 37, spray head 38.

[0027] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0028] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0029] It should be clear that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other technical solutions obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0030] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "an", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0031] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0032] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described based on the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should be understood that when it is mentioned that an element is connected to another element "on" or "under", it can not only be directly connected to the other element "on" or "under", but also be indirectly connected to the other element "on" or "under" through an intermediate element.

[0033] like Figure 1-6 As shown, the embodiment of the present application provides a fatigue strength testing device for a shield segment, which includes a segment positioning support part 1, a pressurizing and vibrating part 2 and a split isolation part 3, wherein the segment positioning and supporting part 1 includes an arc-shaped support seat 11 and a plurality of support rollers 18, the arc-shaped support seat 11 has an arc-shaped support surface, and the plurality of support rollers 18 are arranged at intervals along the circumference of the arc-shaped support surface, and the support rollers 18 can rotate relative to the arc-shaped support surface, and move relative to the arc-shaped support surface to partially expose the arc-shaped support surface or retract and separate from the arc-shaped support surface; the pressurizing and vibrating part 2 includes an arc-shaped pressurizing seat 24 and a vibration mechanism, and the arc-shaped pressurizing seat 24 is located above the arc-shaped support seat 11, The arc-shaped pressure seat 24 can face the arc-shaped support surface and move along the first direction to apply a load. The vibration mechanism is located below the arc-shaped support seat 11. The vibration mechanism can move along the first direction and partially pass through the arc-shaped support surface. The first direction is the height direction of the arc-shaped support seat 11; the split isolation part 3 is located on both sides of the pipe segment positioning support part 1 along the length direction. The split isolation part 3 includes a movable support arc plate 37, a protective cover 31 and a spray mechanism. The movable support arc plates 37 of the two split isolation parts 3 can move axially along the arc-shaped support surface and abut against each other. The spray mechanism is arranged on the inner wall of the protective cover 31. The protective cover 31 can move axially along the arc-shaped support surface and cover the pipe segment positioning support part 1.

[0034] In this embodiment, the fatigue strength testing equipment, when performing fatigue strength testing on shield segments, uses support rollers 18 to roll and adjust the placed shield segments, achieving centering of the shield segments. This allows the shield segments to be stably pressurized and vibrated after centering adjustment. Simultaneously, a spray mechanism adjusts the humidity of the simulated environment to improve the accuracy of test results and reduce the impact of the shield segments' own moisture content. By testing the fatigue strength of shield segments before they leave the factory, this fatigue strength testing equipment effectively prevents quality issues caused by loads and vibrations during actual use in tunnels.

[0035] like Figure 4-6 As shown, in a specific embodiment, the segment positioning support portion 1 also includes a support base 12, a transmission mounting seat 17 and a first driving member; the support base 12 is located at the bottom of the arc-shaped support seat 11, and the transmission mounting seat 17 is arranged in pairs on the support base 12, and the top of the transmission mounting seat 17 is an arc-shaped inclined surface, the support roller 18 is rotatably arranged on the transmission mounting seat 17, and the first driving member is transmission-connected to the transmission mounting seat 17, and the first driving member can drive the transmission mounting seat 17 to move along the width direction of the arc-shaped support seat 11.

[0036] Specifically, the first driving member includes a transmission motor 19 and a transmission screw 13. The length direction of the transmission screw 13 extends along the width direction of the arc-shaped support seat 11, and the transmission screw 13 has a positive thread segment and a negative thread segment with opposite rotation directions. The two transmission mounting seats 17 arranged in pairs are respectively threadedly connected to the positive thread segment and the negative thread segment of the transmission screw 13, and the output end of the transmission motor 19 is connected to the transmission screw 13.

[0037] like Figure 4-6 As shown, in a specific embodiment, the segment positioning support part 1 also includes a plurality of universal wheels 15 and a plurality of first adjustment handles 16. The first adjustment handle 16 is arranged in the arc-shaped support seat 11. The universal wheel 15 is transmission-connected to the first adjustment handle 16. The first adjustment handle 16 can drive the universal wheel 15 to be partially exposed on the support base 12 and retracted into the support base 12.

[0038] like Figure 2-4As shown, in a specific embodiment, the vibration mechanism includes a vibration transmission base 25, a vibration motor 26, a support wedge 27, and a second hydraulic cylinder 28. The vibration transmission base 25 is located below the arcuate support surface and includes multiple raised vibration columns that can penetrate the arcuate support surface. That is, the arcuate support surface is provided with multiple through holes. When the vibration transmission base 25 moves in a first direction, the vibration columns can pass through the arcuate support surface to transmit vibration. Vibration motors 26 are provided on both sides of the vibration transmission base 25. The second hydraulic cylinder 28 is located on both sides of the vibration transmission base 25. The telescopic end of the second hydraulic cylinder 28 is connected to the support wedge 27 to push the vibration transmission base 25 to move in the first direction.

[0039] like Figure 2-4 As shown, in a specific embodiment, the pressurizing vibration part 2 also includes a cylinder support frame 21 and a first hydraulic cylinder 22. The side wall of the arc-shaped support seat 11 is provided with at least one guide slide 14 along the length direction. The cylinder support frame 21 is slidingly connected to the guide slide 14. The first hydraulic cylinder 22 is arranged on the cylinder support frame 21. The telescopic end of the first hydraulic cylinder 22 is connected to the arc-shaped pressurizing seat 24. The arc-shaped pressurizing seat 24 has an arc-shaped pressurizing surface that can fit with the arc-shaped support surface.

[0040] In this embodiment, the first hydraulic cylinder 22 drives the arc-shaped pressure seat 24 to move downward under the support of the cylinder support frame 21 and stably pressurizes the shield segment. The two vibration motors 26 realize simulated vibration of the shield segment under the load pressure state through the vibration transmission seat 25 and the movable support arc plate 37, thereby being able to detect the fatigue strength of the shield segment.

[0041] In addition, the pressurizing vibration part 2 also includes a guide column 23 and a second adjustment handle 29; one end of the guide column 23 is connected to the arc-shaped pressurizing seat 24, and the guide column 23 can slide relative to the cylinder support frame 21, and the second adjustment handle 29 is threadedly connected to the cylinder support frame 21, and the second adjustment handle 29 can lock the cylinder support frame 21 in the preset position of the arc-shaped support seat 11.

[0042] like Figure 1-4As shown, in a specific embodiment, the protective cover 31 is slidably connected to the side wall of the arc-shaped support seat 11; the split isolation part 3 also includes a guide sleeve 34, a connecting slide 36 and a limit ring 35. The limit ring 35 connects one end of the guide sleeve 34 and one end of the connecting slide 36. The other end of the guide sleeve 34 is connected to the protective cover 31, and the other end of the connecting slide 36 is connected to a movable support arc plate 37. The bottom of the movable support arc plate 37 is in contact with the arc support surface. After the movable support arc plates 37 abut each other, the two movable support arc plates 37 can completely fit the lower end surface of the shield segment and provide stable support. In addition, the two protective covers 31 can isolate and protect the shield segment inspection process, effectively preventing the external environment from interfering with the inspection process. The spraying of the spray mechanism can adjust the humidity of the shield segment inspection environment, further improving the accuracy of the inspection results.

[0043] like Figure 1-2 As shown, in a specific embodiment, the spray mechanism includes a spray rack 32 and multiple spray heads 38. The spray rack 32 is mounted on the protective cover 31, and the multiple spray heads 38 are spaced apart along the length of the spray rack 32. In addition, the split isolation portion 3 also includes a guide wheel 33, which is mounted on the bottom of the protective cover 31 and moves in the axial direction of the arc-shaped support surface.

[0044] like Figure 1-6 As shown, the working principle and usage process of the fatigue strength testing equipment of the shield segment in the embodiment of the present application are as follows: when in use, the shield segment that needs to be fatigue strength tested is placed in the middle of the upper end surface of the arc-shaped support seat 11 by hoisting, and the power is turned on. The four support rollers 18 are rotatably connected to the upper ends of the two transmission mounting seats 17, so that the shield segment can be rolled and supported by the four support rollers 18, thereby facilitating the deflection adjustment of the shield segment on the four support rollers 18, so that the center of the shield segment coincides with the center of the vibration transmission seat 25. After centering the shield segment, the cylinder support frame 21 is adjusted. Specifically, the bottom end of the cylinder support frame 21 is slidably connected to the arc support seat 11 through four guide slides 14. The cylinder support frame 21 is moved to the top of the middle of the arc support seat 11 under the guidance of the guide slides 14. The second adjustment handle 29 is rotated. The second adjustment handle 29 is threadedly connected to the cylinder support frame 21, so that the second adjustment handle 29 can lock the cylinder support frame 21 and the arc support seat 11.

[0045] The transmission motor 19 is activated. The ends of the transmission screw 13 are externally threaded with opposite rotation directions. Both ends of the transmission screw 13 are threadedly connected to the two transmission mounting blocks 17. Under the support of the support base 12, the transmission motor 19 drives the two transmission mounting blocks 17 to slide in opposite directions via the transmission screw 13. The transmission mounting blocks 17 then drive the support rollers 18 to retract to the inside of the curved support block 11 and separate from the lower end face of the shield segment. The shield segment is now connected to the curved support block 11 via two movable support arc plates 37. The two protective shields 31, guided by the guide slide 14, move toward each other. The protective shields 31, supported by the rolling support of the guide wheels 33, then synchronously drive the spray rack 32 and guide sleeve 34 to move horizontally. The guide sleeve 34 and the retaining ring 35 then drive the two movable support arc plates 37 toward each other via the connecting slide 36, bringing them into contact with each other. This ensures that the two movable support arc plates 37 fully contact and stably support the lower end face of the shield segment.

[0046] The second hydraulic cylinder 28 is activated, so that the two second hydraulic cylinders 28, supported by the support base 12, drive the two support bevels 27 to move toward each other and push a vibration transmission seat 25, causing the vibration transmission seat 25 to drive the two vibration motors 26 to move upward. At the same time, the upper end of the vibration transmission seat 25 passes through the arc-shaped support seat 11 and contacts the middle of the lower end surface of the movable support arc plate 37. At the same time, the first hydraulic cylinder 22 is activated, so that the first hydraulic cylinder 22, supported by the cylinder support frame 21, drives the arc-shaped pressure seat 24 downward and steadily pressurizes the shield segment. Then, the two vibration motors 26, through the vibration transmission of the vibration transmission seat 25 and the movable support arc plate 37, simulate vibration of the shield segment under load and pressure, thereby testing the fatigue strength of the shield segment.

[0047] The shield segment inspection process can be isolated and protected by two protective covers 31, which can effectively prevent the external environment from interfering with the inspection process. In addition, the spray rack 32 can adjust the humidity of the shield segment inspection environment through multiple spray heads 38 according to the moisture content of the shield segment, further improving the accuracy of the inspection results. A first adjustment handle 16 is installed on the inner side of the four end corners of the support base 12. The support base 12 and the four universal wheels 15 are connected by the first adjustment handle 16. By storing the four first adjustment handles 16, the support base 12 can provide stable support for the entire pair. The first adjustment handle 16 is connected to the support base 12 by a threaded connection, so that when the first adjustment handle 16 rotates, the universal wheel 15 is driven to adjust vertically, thereby facilitating the four universal wheels 15 to move the position of the entire pair.

[0048] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A fatigue strength testing device for shield segments, characterized in that: include: a segment positioning support portion, the segment positioning support portion comprising an arcuate support seat and a plurality of support rollers, the arcuate support seat having an arcuate support surface, the plurality of support rollers being arranged at intervals along the circumference of the arcuate support surface, and the support rollers being capable of rotating relative to the arcuate support surface, and moving relative to the arcuate support surface to partially expose the arcuate support surface or retract and separate from the arcuate support surface; a pressurizing and vibrating portion, the pressurizing and vibrating portion comprising an arc-shaped pressurizing seat and a vibrating mechanism, the arc-shaped pressurizing seat being located above the arc-shaped support seat, the arc-shaped pressurizing seat being capable of facing the arc-shaped support surface and moving along a first direction to apply a load, the vibrating mechanism being located below the arc-shaped support seat, the vibrating mechanism being capable of moving along the first direction and partially passing through the arc-shaped support surface, the first direction being a height direction of the arc-shaped support seat; The split isolation part is located on both sides of the pipe segment positioning support part along the length direction. The split isolation part includes a movable support arc plate, a protective cover and a spray mechanism. The movable support arc plates of the two split isolation parts can move axially along the arc support surface and abut against each other. The spray mechanism is arranged on the inner wall of the protective cover. The protective cover can move axially along the arc support surface and cover the pipe segment positioning support part.

2. The fatigue strength testing equipment for shield segments according to claim 1, characterized in that: The segment positioning support portion also includes a support base, a transmission mounting seat and a first driving member; the support base is located at the bottom of the arc-shaped support seat, the transmission mounting seats are arranged in pairs on the support base, and the top of the transmission mounting seat is an arc-shaped inclined surface, the support roller is rotatably arranged on the transmission mounting seat, the first driving member is connected to the transmission mounting seat in a transmission manner, and the first driving member can drive the transmission mounting seat to move along the width direction of the arc-shaped support seat.

3. The fatigue strength testing equipment for shield segments according to claim 2, characterized in that: The first driving member includes a transmission motor and a transmission screw. The length direction of the transmission screw extends along the width direction of the arc-shaped support seat, and the transmission screw has a positive thread segment and a negative thread segment with opposite rotation directions. The two transmission mounting seats arranged in pairs are respectively threadedly connected to the positive thread segment and the negative thread segment of the transmission screw, and the output end of the transmission motor is connected to the transmission screw.

4. The fatigue strength testing equipment for shield segments according to claim 2, characterized in that: The segment positioning support portion also includes a plurality of universal wheels and a plurality of first adjustment handles. The first adjustment handles are arranged in the arc-shaped support seat. The universal wheels are transmission-connected to the first adjustment handles. The first adjustment handles can drive the universal wheels to partially expose the support base and retract into the support base.

5. The fatigue strength testing equipment for shield segments according to any one of claims 1 to 4, characterized in that: The vibration mechanism includes a vibration transmission seat, a vibration motor, a supporting oblique block and a second hydraulic cylinder; the vibration transmission seat is located below the arc-shaped supporting surface, the vibration transmission seat includes a plurality of raised vibration columns, and the vibration columns can pass through the arc-shaped supporting surface. The vibration motor is provided on both sides of the vibration transmission seat, and the second hydraulic cylinder is located on both sides of the vibration transmission seat. The telescopic end of the second hydraulic cylinder is connected to the supporting oblique block to push the vibration transmission seat to move along the first direction.

6. The fatigue strength testing equipment for shield segments according to claim 5, characterized in that: The pressurizing vibration part also includes a cylinder support frame and a first hydraulic cylinder. The side wall of the arc-shaped support seat is provided with at least one guide slide along the length direction. The cylinder support frame is slidably connected to the guide slide. The first hydraulic cylinder is arranged on the cylinder support frame. The telescopic end of the first hydraulic cylinder is connected to the arc-shaped pressurizing seat. The arc-shaped pressurizing seat has an arc-shaped pressurizing surface that can fit with the arc-shaped support surface.

7. The fatigue strength testing equipment for shield segments according to claim 6, characterized in that: The pressurizing vibration part also includes a guide column and a second adjustment handle; one end of the guide column is connected to the arc-shaped pressurizing seat, and the guide column can slide relative to the cylinder support frame, and the second adjustment handle is threadedly connected to the cylinder support frame, and the second adjustment handle can lock the cylinder support frame at a preset position of the arc-shaped support seat.

8. The fatigue strength testing equipment for shield segments according to any one of claims 1-4 or 6-7, characterized in that: The protective cover is slidably connected to the side wall of the arc-shaped support seat; the split isolation part also includes a guide sleeve, a connecting slide rod and a limit ring, the limit ring connects one end of the guide sleeve and one end of the connecting slide rod, the other end of the guide sleeve is connected to the protective cover, and the other end of the connecting slide rod is connected to the movable support arc plate, and the bottom of the movable support arc plate is attached to the arc support surface.

9. The fatigue strength testing equipment for shield segments according to claim 8, characterized in that: The spray mechanism includes a spray rack and a plurality of spray heads. The spray rack is arranged on the protective cover, and the plurality of spray heads are arranged at intervals along the length direction of the spray rack.

10. The fatigue strength testing equipment for shield segments according to claim 8, characterized in that: The split isolation part further includes a guide wheel, which is arranged at the bottom of the protective cover, and the moving direction of the guide wheel is the axial direction of the arc-shaped supporting surface.

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