Boots and excavators

Abstract

The application provides a support shoe and a heading machine. The support shoe comprises a support shoe outer shell, a support shoe inner shell and a filler. The support shoe outer shell and the support shoe inner shell have opposite first and second states. In the first state, the support shoe outer shell is fixedly connected with the support shoe inner shell, and the outer surface of the support shoe outer shell is matched with the outer surface of the support shoe inner shell. When the first state is converted to the second state, the support shoe outer shell is slidably connected with the support shoe inner shell. In the second state, a gap is formed between the support shoe outer shell and the support shoe inner shell, and the filler is used to fill the gap between the support shoe outer shell and the support shoe inner shell in the second state. The application does not need to replace the support shoe or install new support shoe parts, and the requirement for space is relatively low when the length of the support shoe is changed, so that the cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of tunnel construction machinery, and in particular to a support shoe and a tunnel boring machine. Background Art

[0002] Roadheaders (TBMs) are machines used to excavate tunnels beneath flat ground. Due to their advantages of high excavation speed, safe operation, and minimal impact on the underground environment, they are widely used in underground tunnel construction. The full-face rock tunnel boring machine (TBM) is a highly efficient machine specifically designed for rock tunnel construction. It can simultaneously perform excavation, support, and mucking operations, enabling a factory-like, assembly-line approach to tunnel construction.

[0003] During operation, full-face rock tunnel boring machines (TBMs) require extending grippers to hold the soil tight. As tunneling progresses, they often encounter situations where expansion or turns are necessary, requiring the gripper length to be changed. In related art solutions, gripper length changes are primarily achieved by adding gripper jackets or simply replacing grippers with newer lengths. This approach requires the cost of remanufacturing new grippers or gripper components, which also requires significant space when replacing or installing gripper components within the tunnel. The installation or replacement process is time-consuming and labor-intensive. Summary of the Invention

[0004] In order to overcome the above-mentioned defects in the related art, the purpose of this application is to provide a gripper shoe and a tunnel boring machine. This application does not require the replacement of the gripper shoe or the installation of new gripper shoe components, and the space requirement is also low when the gripper shoe length is changed, which is conducive to reducing costs.

[0005] On the one hand, the present application provides a support boot, comprising a support boot outer shell, a support boot inner shell and a filling piece, wherein the support boot outer shell and the support boot inner shell have a relative first state and a second state; in the first state, the support boot outer shell is fixedly connected to the support boot inner shell, and the outer surface of the support boot outer shell is adapted to the outer surface of the support boot inner shell; when converting from the first state to the second state, the support boot outer shell and the support boot inner shell are slidably connected; in the second state, a gap is formed between the support boot outer shell and the support boot inner shell, and the filling piece is used to fill the gap between the support boot outer shell and the support boot inner shell in the second state.

[0006] In a possible implementation, in the first state, the gripper outer shell and the gripper inner shell are connected via a first fixing member.

[0007] In a possible implementation, the device further includes a gripper cylinder, the gripper cylinder including a cylinder barrel and a piston rod, the piston rod being slidably disposed in the cylinder barrel, and the piston rod being connected to the gripper housing;

[0008] A positioning block is further provided on the outer side of the cylinder, and a plurality of top blocks are detachably provided on the side of the positioning block facing the support shoe outer shell. When switching from the first state to the second state, the top blocks abut against the support shoe inner shell, thereby making the support shoe outer shell and the support shoe inner shell slidably connected.

[0009] In a possible implementation, the gripper outer shell includes a first portion and a second portion, with a gap formed between the first portion and the second portion; the gripper inner shell includes a main body and an abutting portion, the abutting portion being provided on both sides of the main body and passing through the gap between the first portion and the second portion;

[0010] When the first state is switched to the second state, the top block abuts against the abutting portion.

[0011] In a possible implementation, a protrusion is provided on the first part, and a recess is provided on the piston rod. The protrusion matches the recess and abuts against the recess.

[0012] In a possible implementation, the raised portion and the recessed portion are both semi-spherical;

[0013] The first part is further provided with a boss, which surrounds the outer side of the raised portion. A clamping ring is provided on the boss, and an escape groove is provided on the piston rod. The clamping ring abuts against the escape groove.

[0014] In a possible implementation, a limit block is further provided on the clamping ring, and at least a portion of the limit block is located in the avoidance groove; the limit block is a rubber block.

[0015] In a possible implementation, in the second state, the gripper outer shell and the gripper inner shell are connected via a second fixing member;

[0016] The second fixing member includes a limiting plate and a limiting screw. Part of the limiting plate is fixedly connected to the abutting portion. In the second state, the other part of the limiting plate abuts on the second part. The limiting screw passes through the limiting plate and is fixedly connected to the second part.

[0017] In one possible implementation, the filling piece includes sleepers and anti-slip nails. In the second state, the anti-slip nails are detachably arranged on the side of the main body facing the first part and the side of the first part facing the main body. The sleepers are connected to the anti-slip nails and fill between the main body and the first part.

[0018] On the other hand, the present application provides a roadheader, comprising a shield body, wherein opposite sides of the shield body are provided with any of the gripper shoes described above.

[0019] The application provides a support shoe and a heading machine. The support shoe comprises a support shoe shell, a support shoe inner shell and a filling piece. The support shoe shell and the support shoe inner shell have opposite first and second states. In the first state, the support shoe shell and the support shoe inner shell are fixedly connected, and the outer surface of the support shoe shell is matched with the outer surface of the support shoe inner shell. When the first state is converted to the second state, the support shoe shell and the support shoe inner shell are slidably connected. In the second state, a gap is formed between the support shoe shell and the support shoe inner shell, and the filling piece is used to fill the gap between the support shoe shell and the support shoe inner shell in the second state. The support shoe shell and the support shoe inner shell are slidably connected when the first state is converted to the second state, so that a gap is formed between the support shoe shell and the support shoe inner shell in the second state, and the filling piece is filled into the gap to increase the overall length of the support shoe. The application does not need to replace the support shoe or install new support shoe parts, and the space requirement is low when the length of the support shoe is changed, which is beneficial to reduce the cost. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the application or the related art, below will briefly introduce the drawings needed to be used in the embodiments or the related art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0021] Figure 1 The structural diagram of the support shoe in the first state provided by an embodiment of the application;

[0022] Figure 2 The structural diagram of the support shoe in the second state provided by an embodiment of the application; Figure 1 The sectional view of A-A in the second state;

[0023] Figure 3 The enlarged view of I in the second state; Figure 2

[0024] Figure 4 The structural sectional view of the support shoe in the second state provided by an embodiment of the application.

[0025] Reference signs:

[0026] 100 - support shoe shell; 101 - outer surface of the support shoe shell; 110 - first part; 111 - protruding part; 112 - boss; 120 - second part; 130 - compression ring; 140 - limiting block;

[0027] 200 - support shoe inner shell; 201 - outer surface of the support shoe inner shell; 210 - main body; 220 - abutting part;

[0028] 300 - filling piece; 310 - sleeper; 320 - anti-skid nail;​

[0029] 400-supporting shoe oil cylinder; 410-cylinder barrel; 420-piston rod; 421-recess; 422-avoidance slot; 430-positioning block; 440-top block;

[0030] 510-limiting plate; 520-limiting screw. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application.

[0032] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0033] As described in the background, in the related art, when the tunneling machine encounters a situation requiring expansion or turning, the length of the supporting shoe needs to be changed to achieve the expansion or turning. For example, when expansion is required, the length of the two supporting shoes needs to be lengthened synchronously so that the two supporting shoes can stably support the soil layer on both sides; when turning is required, the length of the two supporting shoes needs to have a difference, so that when the two supporting shoes abut against the soil layer, the tunneling machine will be offset, thereby achieving turning. However, in the related art, the length of the supporting shoe needs to be changed by adding a supporting shoe cover or directly replacing a new length of supporting shoe. When the supporting shoe cover is added, a cover structure matched with the supporting shoe needs to be additionally manufactured, which increases the cost; and the cover needs to be installed in the tunnel, and when the cover is installed, the soil layer at the supporting shoe needs to be excavated to leave enough operation space, which consumes time and effort in the process of excavating and installing the cover. When the new length of supporting shoe is used, a new supporting shoe also needs to be manufactured in advance, which increases the cost; and when the supporting shoe is replaced, the soil layer at the supporting shoe also needs to be excavated to leave enough operation space, which consumes time and effort in the process of excavating and replacing the supporting shoe.

[0034] Therefore, the embodiments of the present application aim to provide a supporting shoe and a tunneling machine, by setting the supporting shoe shell and the supporting shoe inner shell to be slidably adjusted, when the length of the supporting shoe needs to be changed, the gap between the supporting shoe shell and the supporting shoe inner shell can be increased, and a filler can be arranged in the gap, thereby changing the length of the supporting shoe. The embodiments of the present application do not need to replace the supporting shoe or install a new supporting shoe part, and the requirement for space when the length of the supporting shoe is changed is also lower, which is conducive to reducing the cost.

[0035] The content of the embodiments of the present application will be described in detail below in combination with the drawings, so that those skilled in the art can understand the content of the present application in more detail.

[0036] Figure 1 A structure diagram of a support shoe in a first state according to an embodiment of the present application is provided; Figure 2 A structure diagram of a support shoe in a second state according to an embodiment of the present application is provided; Figure 1 A sectional view of A-A in the support shoe; Figure 3 A sectional view of B-B in the support shoe; Figure 2 An enlarged view of I in the support shoe; Figure 4 A structure diagram of a support shoe in a first state according to an embodiment of the present application is provided;

[0037] Please refer to Figures 1-4 The support shoe provided by the embodiment comprises a support shoe outer shell 100, a support shoe inner shell 200 and a filling piece 300. The support shoe outer shell 100 and the support shoe inner shell 200 are both made of metal material, for example, high-strength steel material. The filling piece 300 can be made of material with a strength less than that of the support shoe outer shell 100 and the support shoe inner shell 200. The outer surface 101 of the support shoe outer shell and the outer surface 201 of the support shoe inner shell are both arc-shaped to be adapted to the shield body of the tunneling machine.

[0038] The support shoe outer shell 100 and the support shoe inner shell 200 of the embodiment have a first state and a second state.

[0039] Specifically, in the first state, the support shoe outer shell 100 is fixedly connected with the support shoe inner shell 200, and the outer surface 101 of the support shoe outer shell is adapted to the outer surface 201 of the support shoe inner shell. That is, in the first state, the support shoe outer shell 100 and the support shoe inner shell 200 form an integral body, the outer surface 101 of the support shoe outer shell and the outer surface 201 of the support shoe inner shell are located in the same arc surface, and the tunneling machine can abut on the soil layer by using the outer surface 101 of the support shoe outer shell and the outer surface 201 of the support shoe inner shell at the same time.

[0040] When the support shoe is converted from the first state to the second state, the support shoe outer shell 100 and the support shoe inner shell 200 are slidably connected. At this time, the support shoe outer shell 100 and the support shoe inner shell 200 are separated into two relatively independent components, and the support shoe inner shell 200 can slide along the support shoe outer shell 100, so that the distance between the support shoe outer shell 100 and the support shoe inner shell 200 is changed.

[0041] In the second state, a gap is formed between the support shoe outer shell 100 and the support shoe inner shell 200, and the filling piece 300 is used to fill between the support shoe outer shell 100 and the support shoe inner shell 200 in the second state. In the embodiment, the size of the gap between the support shoe outer shell 100 and the support shoe inner shell 200 can be determined according to the length of the support shoe needed to be extended. In combination with Figure 4It can be understood that after the filler 300 is filled between the support shoe outer shell 100 and the support shoe inner shell 200, part of the support shoe inner shell 200 protrudes out of the support shoe outer shell 100, the overall length of the support shoe is lengthened, and the excavator can abut the outer surface 201 of the support shoe inner shell against the soil layer, so that the adjustable length of the support shoe is realized through the above-mentioned mode.

[0042] As can be known from the above description, in the embodiment, the support shoe outer shell 100 and the support shoe inner shell 200 are slidably connected when being converted from the first state to the second state, so that a gap is formed between the support shoe outer shell 100 and the support shoe inner shell 200 in the second state, and then the filler 300 is filled into the gap to increase the overall length of the support shoe. The embodiment does not need to replace the support shoe or install a new support shoe part, and the requirement for space when changing the length of the support shoe is also lower (only the change amount of the length of the support shoe needs to be reserved, and the soil layer at the support shoe does not need to be expanded on a large scale), which is conducive to reducing the cost.

[0043] In a possible implementation, in the first state, the support shoe outer shell 100 and the support shoe inner shell 200 of the embodiment are connected through a first fixing part. Specifically, the first fixing part of the embodiment can be selected from a positioning pin, a bolt and the like, the first fixing part is connected with the support shoe inner shell 200 after penetrating through the support shoe outer shell 100, so as to fix the support shoe outer shell 100 and the support shoe inner shell 200 and make the support shoe outer shell 100 and the support shoe inner shell 200 form an integral whole. The first fixing part should be installed at a position that is easy to disassemble, so as to facilitate dismounting the first fixing part when converting from the first state to the second state.

[0044] In a possible implementation, the support shoe of the embodiment further includes a support shoe oil cylinder 400, the support shoe oil cylinder 400 includes a cylinder barrel 410 and a piston rod 420, the piston rod 420 is slidably arranged in the cylinder barrel 410, and the piston rod 420 is connected with the support shoe outer shell 100, so as to drive the support shoe outer shell 100 and the support shoe inner shell 200 to move synchronously and realize the extension and retraction of the support shoe. The support shoe oil cylinder 400 of the embodiment can be selected from a hydraulic cylinder or an air cylinder, for example.

[0045] In the embodiment, the outer side of the cylinder barrel 410 is further provided with a positioning block 430, and the positioning block 430 is fixedly connected with the cylinder barrel 410 through bolts or the like. Alternatively, the positioning block 430 is arranged on both sides of the cylinder barrel 410 and is symmetrically arranged. A plurality of jacks 440 are detachably arranged on the side surface of the positioning block 430 facing the support shoe outer shell 100, and when converting from the first state to the second state, the jacks 440 abut against the support shoe inner shell 200, so that the support shoe outer shell 100 and the support shoe inner shell 200 are slidably connected.

[0046] In combination with Figure 2 and Figure 4It can be understood that when the supporting shoe of the embodiment is converted from the first state to the second state, the first fixing member between the supporting shoe shell 100 and the supporting shoe inner shell 200 needs to be disassembled first, so that the supporting shoe inner shell 200 can slide relative to the supporting shoe shell 100. Then, the piston rod 420 can be extended by a certain length, and the piston rod 420 is extended to drive the supporting shoe shell 100 and the supporting shoe inner shell 200 to be extended synchronously, and the gap between the positioning block 430 and the supporting shoe shell 100 and the supporting shoe inner shell 200 is increased. Then, the top block 440 can be installed on the side surface of the positioning block 430 towards the supporting shoe shell 100, and the specific installation number of the top block 440 can be determined according to the need of the extension length. Then, the extended piston rod 420 is retracted, and the top block 440 will abut on the supporting shoe inner shell 200 to prevent the retraction action of the supporting shoe inner shell 200; with the continuous retraction of the supporting shoe shell 100, the supporting shoe inner shell 200 is extended by a certain length relative to the supporting shoe shell 100, and a gap is generated between the supporting shoe shell 100 and the supporting shoe inner shell 200.

[0047] Optionally, the supporting shoe shell 100 of the embodiment includes a first part 110 and a second part 120, and a gap is formed between the first part 110 and the second part 120. The supporting shoe inner shell 200 includes a main body 210 and an abutting portion 220, and the abutting portion 220 is arranged on both sides of the main body 210. The abutting portion 220 is arranged between the gap between the first part 110 and the second part 120, and abuts on the top block 440 after passing through the gap.

[0048] When the embodiment is converted from the first state to the second state, the top block 440 abuts on the abutting portion 220 to push the supporting shoe inner shell 200 to extend out of the supporting shoe shell 100.

[0049] Please continue to refer to Figure 2 and Figure 3 In the embodiment, the first part 110 is provided with a protruding portion 111, and the piston rod 420 is provided with a recessed portion 421, and the protruding portion 111 is matched with the recessed portion 421 and abuts in the recessed portion 421. That is, the piston rod 420 and the supporting shoe shell 100 of the embodiment are connected through the cooperation of the protruding portion 111 and the recessed portion 421.

[0050] Further, the protruding portion 111 and the recessed portion 421 of the embodiment are both semispherical, and the piston rod 420 can not only drive the supporting shoe shell 100 to extend and retract, but also rotate around the protruding portion 111.

[0051] The first part 110 of the embodiment is further provided with a boss 112, which is arranged outside the protruding part 111, and a compression ring 130 is arranged on the boss 112. A piston rod 420 is provided with an avoiding groove 422, and the compression ring 130 is abutted in the avoiding groove 422, so that the rotation angle of the piston rod 420 is limited by the compression ring 130, and interference between the piston rod 420 and the boss 112 is prevented when the piston rod 420 rotates.

[0052] Further, the compression ring 130 of the embodiment is further provided with a limiting block 140, and at least part of the limiting block 140 is arranged in the avoiding groove 422. Preferably, the limiting block 140 of the embodiment is a rubber block, and the limiting block 140 can play a role of preliminary limiting.

[0053] Please continue to refer to Figure 4 When the support shoe is in the second state, the support shoe shell 100 and the support shoe inner shell 200 are connected by the second fixing part, so that the support shoe shell 100 and the support shoe inner shell 200 are relatively fixed by the second fixing part, and the support shoe inner shell 200 is prevented from falling out of the support shoe shell 100.

[0054] Specifically, the second fixing part includes a limiting plate 510 and a limiting screw 520. Part of the limiting plate 510 is fixedly connected with the abutting part 220, and in the second state, the other part of the limiting plate 510 is abutted on the second part 120. The limiting screw 520 is fixedly connected with the second part 120 after penetrating through the limiting plate 510, so that the support shoe shell 100 and the support shoe inner shell 200 are relatively fixed, and at this time, the support shoe can be kept in an elongated state.

[0055] The filling part 300 of the embodiment includes a sleeper 310 and a stud 320. In the second state, the stud 320 is detachably arranged on the side of the main body 210 facing the first part 110 and the side of the first part 110 facing the main body 210, and the sleeper 310 is connected with the stud 320 and filled between the main body 210 and the first part 110. By filling the sleeper 310, the gap between the support shoe shell 100 and the support shoe inner shell 200 is filled, so that the support shoe is kept in an elongated state; when the support shoe is not needed to be elongated, only the sleeper 310 needs to be removed.

[0056] As known from the above description, when the support shoe is in the first state, the support shoe shell 100 and the support shoe inner shell 200 are connected by the first fixing part, and at this time, the outer surface 101 of the support shoe shell and the outer surface 201 of the support shoe inner shell can be abutted on the soil layer at the same time to tighten the soil layer by the tunneling machine, and the friction between the support shoe and the soil layer provides a counterforce for the tunneling machine to advance.

[0057] When the working condition such as diameter expansion or turning is encountered, the support shoe needs to be elongated. At this time, the support shoe is converted from the first state to the second state. First, the first fixing member between the support shoe outer shell 100 and the support shoe inner shell 200 is disassembled, so that the support shoe inner shell 200 can slide relative to the support shoe outer shell 100. Then, the piston rod 420 can be extended by a certain length. When the piston rod 420 is extended, the support shoe outer shell 100 and the support shoe inner shell 200 are synchronously extended, and the gap between the positioning block 430 and the support shoe outer shell 100 and the support shoe inner shell 200 is increased. Then, the top block 440 can be installed on the side surface of the positioning block 430 towards the support shoe outer shell 100. The specific installation number of the top block 440 can be determined according to the need of the extension length. Then, the extended piston rod 420 is retracted. The top block 440 will abut against the support shoe inner shell 200 to prevent the retraction action of the support shoe inner shell 200. With the continuous retraction of the support shoe outer shell 100, the support shoe inner shell 200 is extended by a certain length relative to the support shoe outer shell 100, and a gap is generated between the support shoe outer shell 100 and the support shoe inner shell 200.

[0058] In the second state, the support shoe outer shell 100 and the support shoe inner shell 200 are connected by the second fixing member. The second fixing member includes the limiting plate 510 and the limiting screw 520. Part of the limiting plate 510 is fixedly connected with the abutting portion 220. In the second state, the other part of the limiting plate 510 abuts on the second portion 120. The limiting screw 520 is fixedly connected with the second portion 120 after penetrating through the limiting plate 510, so as to relatively fix the support shoe outer shell 100 and the support shoe inner shell 200. At this time, the support shoe can be kept in the elongated state. Then, the sleeper 310 is filled in the gap between the support shoe outer shell 100 and the support shoe inner shell 200, so as to keep the support shoe in the elongated state by using the sleeper 310.

[0059] The embodiment also provides a tunneling machine including the shield body. The shield body is provided with the above support shoes on opposite sides.

[0060] The tunneling machine of the embodiment can adapt to the needs of the working conditions such as diameter expansion or turning, because the above support shoes are provided.

[0061] Specifically, in the diameter expansion working condition, the support shoes on both sides can be synchronously elongated, so that the support shoes on both sides can be stably supported on the soil layers on both sides, thereby realizing diameter expansion.

[0062] In the turning working condition, one side support shoe can be elongated, while the length of the support shoe on the other side remains unchanged, so that there is a difference between the lengths of the support shoes on both sides. When the support shoes on both sides abut on the soil layers, the tunneling machine will be offset, thereby realizing turning.

[0063] The tunneling machine of the embodiment does not need to replace the support shoes or install new support shoe components in the working conditions such as diameter expansion or turning, and has a lower requirement for space when the length of the support shoe is changed, which is conducive to cost reduction.

[0064] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which are for convenience of description and simplification of the description of the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0065] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0066] It should be noted that in the description of the present application, the terms "first", "second" are only used for the convenience of describing different parts, and cannot be understood as indicating or implying the order relationship, relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can include at least one of the features.

[0067] The embodiments or implementations in the present application are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the embodiments can be referred to each other.

[0068] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0069] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A gripper shoe, characterized in that: The shoe comprises a gripper outer shell, a gripper inner shell, and a filling piece, wherein the gripper outer shell and the gripper inner shell have a first state and a second state relative to each other; in the first state, the gripper outer shell is fixedly connected to the gripper inner shell, and the outer surface of the gripper outer shell is adapted to the outer surface of the gripper inner shell; when switching from the first state to the second state, the gripper outer shell and the gripper inner shell are slidably connected; in the second state, a gap is formed between the gripper outer shell and the gripper inner shell, and the filling piece is used to fill the gap between the gripper outer shell and the gripper inner shell in the second state; In the first state, the gripper outer shell and the gripper inner shell are connected via a first fixing member; The invention also includes a gripper cylinder, wherein the gripper cylinder includes a cylinder barrel and a piston rod, wherein the piston rod is slidably disposed in the cylinder barrel and the piston rod is connected to the gripper housing; A positioning block is further provided on the outer side of the cylinder, and a plurality of top blocks are detachably provided on the side of the positioning block facing the support shoe outer shell. When switching from the first state to the second state, the top blocks abut against the support shoe inner shell, thereby making the support shoe outer shell and the support shoe inner shell slidably connected.

2. The gripper shoe according to claim 1, characterized in that The gripper outer shell includes a first portion and a second portion, with a gap formed between the first portion and the second portion; the gripper inner shell includes a main body and an abutting portion, the abutting portion is provided on both sides of the main body, and the abutting portion is provided between the gap between the first portion and the second portion; When the first state is switched to the second state, the top block abuts against the abutting portion.

3. The gripper shoe according to claim 2, characterized in that A convex portion is provided on the first part, and a concave portion is provided on the piston rod. The convex portion is matched with the concave portion and the convex portion abuts against the concave portion.

4. The gripper shoe according to claim 3, characterized in that The convex portion and the concave portion are both semi-spherical; The first part is further provided with a boss, which surrounds the outer side of the raised portion. A clamping ring is provided on the boss, and an escape groove is provided on the piston rod. The clamping ring abuts against the escape groove.

5. The gripper shoe according to claim 4, characterized in that The clamping ring is further provided with a limit block, at least part of which is located in the avoidance groove; the limit block is a rubber block.

6. The gripper shoe according to claim 2, characterized in that In the second state, the gripper outer shell and the gripper inner shell are connected via a second fixing member; The second fixing member includes a limiting plate and a limiting screw. Part of the limiting plate is fixedly connected to the abutting portion. In the second state, the other part of the limiting plate abuts on the second part. The limiting screw passes through the limiting plate and is fixedly connected to the second part.

7. The gripper shoe according to claim 6, characterized in that The filling piece includes sleepers and anti-slip nails. In the second state, the anti-slip nails are detachably arranged on the side of the main body facing the first part and the side of the first part facing the main body. The sleepers are connected to the anti-slip nails and filled between the main body and the first part.

8. A tunnel boring machine, characterized in that: The shield comprises a shield body, wherein opposite sides of the shield body are provided with the gripper shoes according to any one of claims 1 to 7.

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