Pipe piece for improving shock resistance and toughness of shield tunnel and pipe piece connecting structure

Abstract

The utility model discloses a duct piece for improving the shock resistance and toughness of a shield tunnel and a duct piece connecting structure, and belongs to the related technical field of the shield tunnel. The first double-sleeve and the second double-sleeve in the ductile assembly are correspondingly arranged, and the axial ductile unit and the radial ductile unit between the two double-sleeves are correspondingly arranged, so that the duct piece can have certain axial anti-seismic toughness and radial anti-seismic toughness after being connected. The duct piece for improving the shock resistance and toughness of the shield tunnel is compact in structure and convenient to set and use, the shock resistance and toughness of the duct piece of the shield tunnel can be effectively improved, the shield tunnel can resist certain axial impact and radial impact when an earthquake occurs, the structural stability of the shield tunnel under the action of certain impact force is ensured, and the service life of the shield tunnel is prolonged. And therefore, safe operation of the shield tunnel is guaranteed, the service life of the shield tunnel is prolonged, and good practical value is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field related to shield tunnels, and specifically relates to a pipe segment and a pipe segment connection structure for improving the seismic toughness of a shield tunnel. Background Art

[0002] With the gradual advancement of my country's infrastructure construction, the design and construction of shield tunnels are becoming more and more common, and the requirements for the construction quality of shield tunnels are becoming higher and higher. When designing the construction of shield tunnels, how to improve the system stability of shield tunnels under uncertain interference (such as natural disasters or extreme disturbances) has become the focus of designers and construction personnel, and seismic toughness is the core focus.

[0003] The toughness of a shield tunnel in the face of an earthquake can be defined as seismic toughness. In general, shield tunnel segments are connected mainly by bolts. Based on the above connection method, the prior art adopts the method of adding steel springs or rubber gaskets to the bolt pads to increase the telescopic length of the bolts, which can theoretically improve the seismic toughness of the shield tunnel to a certain extent. However, during the implementation process, the researchers found that for the installation of steel springs, the springs are basically completely compressed due to the application of the bolt preload, and lose their shock-absorbing effect, while increasing the spring stiffness will have an adverse effect on the structural stress, and the installation is also more difficult; for the installation of rubber gaskets, due to their low elastic modulus, small thickness, weak deformation ability, and easy to reach yield or even damage during bolt installation and lose elastic deformation ability. Therefore, the above method has obvious defects and it is difficult to meet the design requirements in actual engineering.

[0004] Although a series of studies have been conducted in the prior art to improve the seismic toughness of shield tunnels, for example, in the existing patent document CN114215534A, a special composite sleeve for oblique bolts in shield tunnels with a shock-absorbing effect is proposed. By improving the bolt sleeve, the bolt sleeve has the ability to offset a certain seismic load, which increases the shield tunnel's anti-deformation ability and shock-absorbing effect to a certain extent. However, this composite sleeve is only applicable to oblique bolts and has a narrow scope of application; moreover, the composite sleeve can only offset the seismic effect along the bolt direction, but cannot offset the seismic effect in the shear direction, and the seismic toughness is obviously limited. Utility Model Content

[0005] In response to one or more of the above-mentioned defects or improvement needs in the prior art, the utility model provides a segment and a segment connection structure for improving the seismic toughness of a shield tunnel, which can effectively improve the radial and axial seismic resistance of the segment, thereby improving the seismic toughness of the shield tunnel and ensuring the reliability of the design and operation of the shield tunnel.

[0006] To achieve the above-mentioned object, one aspect of the utility model provides a segment for improving the seismic toughness of a shield tunnel, wherein the segment is provided with an arc-shaped connecting hole extending from the inner wall surface of the segment to the end surface at the end portion thereof for butting against the adjacent segment;

[0007] A tough component with closed ends is fixedly arranged on the inner wall surface of the arc-shaped connecting hole;

[0008] The toughness component comprises a first double sleeve and a second double sleeve arranged coaxially; the outer diameter of the second double sleeve is smaller than the inner diameter of the first double sleeve, an annular cavity is formed between the two double sleeves, and an axial toughness unit and a radial toughness unit are arranged in the annular cavity;

[0009] Both double sleeves include an outer tube unit and an inner tube unit that are coaxially arranged, and a ball layer formed by a plurality of spaced balls is arranged between the outer tube unit and the inner tube unit; the outer diameter of the balls is greater than the spacing between the corresponding outer tube unit and the inner tube unit, and the inner tube unit of the first double sleeve and the outer tube unit of the second double sleeve are respectively provided with a plurality of through holes that penetrate inside and outside and have an inner diameter smaller than the outer diameter of the balls, so that each ball passes through the through hole on a side close to the annular cavity and protrudes into the annular cavity;

[0010] The radial toughness unit is coaxially arranged in the middle of the annular cavity, and axial toughness units are respectively arranged at the two axial ends thereof; the radial toughness unit comprises a piston steel cylinder which is hollow inside and in an arc shape, the two ends of the piston steel cylinder are closed, and the inner and outer wall surfaces thereof respectively abut against the surfaces of the two ball layers protruding into the annular cavity; and the outer peripheral wall surface of the piston steel cylinder is fixedly connected to the inner wall surface of the arc-shaped connecting hole through the annular steel bar passing through the first double sleeve;

[0011] The axial toughness unit comprises a plurality of axial ring plates spaced apart in the axial direction, and an axial spring is arranged axially between two adjacent axial ring plates and between the axial ring plate and the end of the piston steel cylinder.

[0012] As a further improvement of the utility model, a plurality of radial springs are radially arranged in the hollow cylinder cavity of the piston steel cylinder.

[0013] As a further improvement of the present invention, the radial springs are arranged at equal intervals in the annular direction and / or in the axial direction.

[0014] As a further improvement of the utility model, lubricating oil is injected between the outer tube unit and the inner tube unit of at least one double tube.

[0015] As a further improvement of the utility model, both ends of the two double sleeves are respectively closed by annular covers, and an openable and closable oil filling hole is provided on the annular cover corresponding to at least one double sleeve for regularly injecting lubricating oil between the inner tube unit and the outer tube unit of the corresponding double sleeve.

[0016] As a further improvement of the utility model, the axial ring plate is made of elastic memory material, which can be compressed when subjected to axial extrusion and recover after the effect is released.

[0017] As a further improvement of the present invention, both ends of the axial spring are fixedly connected to corresponding components, and the axial springs are arranged at equal intervals in the annular direction.

[0018] As a further improvement of the present invention, the inner wall surface of the annular steel bar is welded to the outer peripheral wall surface of the first double sleeve, and the outer wall surface thereof is fixedly connected to the internal steel bars of the pipe segment.

[0019] Another aspect of the utility model further provides a pipe segment connection structure, wherein the pipe segment connection structure is obtained by aligning the ends of two pipe segments for improving the seismic toughness of a shield tunnel and connecting them with an arc bolt assembly;

[0020] The arc-shaped connecting holes of the two pipe segments are aligned at their ends to form a continuous arc-shaped through hole, a plastic sleeve is axially passed through the arc-shaped through hole, and a continuously extending arc-shaped channel is formed in the plastic sleeve;

[0021] The arc-shaped bolt assembly comprises an arc-shaped bolt and a nut. The arc-shaped bolt penetrates from one end of the arc-shaped channel and passes out from the other end of the arc-shaped channel. The nut is lockingly connected to the end of the arc-shaped bolt.

[0022] As a further improvement of the utility model, an intermediate cushion layer is provided between the two pipe segments;

[0023] The middle cushion layer is a sheet structure made of elastic material, and a through hole for the arc bolt to pass through is formed in the middle thereof. The arc bolt passes through the through hole in the middle of the middle cushion layer and sandwiches the middle cushion layer between the ends of two pipe segments.

[0024] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0025] In general, compared with the prior art, the above technical solutions conceived by the utility model have the following beneficial effects:

[0026] (1) The utility model is a segment for improving the seismic toughness of a shield tunnel. By coaxially arranging a toughness component on the inner wall surface of an arc-shaped connecting hole, and utilizing the corresponding arrangement of the first double sleeve, the second double sleeve, and the axial toughness unit and the radial toughness unit between the two double sleeves in the toughness component, the segment can have a certain axial seismic toughness and radial seismic toughness after being connected, thereby effectively improving the seismic toughness of the shield tunnel, ensuring the stability and safety of the shield tunnel operation, and extending the service life of the shield tunnel.

[0027] (2) The utility model is used to improve the seismic toughness of the shield tunnel segment. By preferably setting the structure of the axial toughness unit and the radial toughness unit, and using the corresponding arrangement of components such as radial springs and axial springs, the toughness component of the segment can fully guarantee the axial and radial seismic toughness, ensure the reliability of the connection setting of the segment in the initial stage and the seismic resistance when an earthquake occurs, and fully improve the safety of the shield tunnel setting and operation.

[0028] (3) The pipe segment connection structure of the utility model is formed by connecting two pipe segments provided with tough components by an arc-shaped bolt assembly. By utilizing the corresponding arrangement of the plastic sleeve that penetrates the arc-shaped connecting holes of the two pipe segments after the ends of the two pipe segments are butted together, the accuracy of the butt connection of the two pipe segments can be effectively ensured, and the reliable protection of the arc-shaped bolt assembly can be achieved. Based on the corresponding arrangement of the tough components in the two pipe segments, the seismic toughness of the shield tunnel at the pipe segment connection part can be effectively improved, and the arc-shaped bolt assembly can be prevented from being subjected to excessive axial and radial impact forces during an earthquake, thereby fully improving the shape retention capability of the pipe segment connection structure under special environments such as earthquakes.

[0029] (4) The segments used to improve the seismic toughness of the shield tunnel in the utility model have a compact structure and are easy to set up and use. They can effectively improve the seismic toughness of the shield tunnel segments, so that the shield tunnel can resist certain axial impacts and radial impacts when an earthquake occurs, thereby ensuring the structural stability of the shield tunnel under certain impact forces, thereby ensuring the safe operation of the shield tunnel and extending the service life of the shield tunnel. It has good practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 It is a structural schematic diagram of the pipe segment and the pipe segment connection structure in the embodiment of the utility model;

[0032] Figure 2It is a schematic diagram of the connection structure between the toughness component and the arc bolt component in the embodiment of the utility model;

[0033] Figure 3 It is the embodiment of the utility model Figure 2 Partial AA section view;

[0034] Figure 4 It is the embodiment of the utility model Figure 2 Partial BB cross-sectional view;

[0035] In all the drawings, the same reference numerals represent the same technical features, specifically:

[0036] 1. Segment; 101. Installation hand hole; 102. Arc-shaped connecting hole;

[0037] 2. Toughness component; 201. First double sleeve; 202. Second double sleeve; 203. Ball layer; 204. Piston steel cylinder; 205. Radial spring; 206. Axial ring plate; 207. Axial spring; 208. Annular cover; 209. Annular steel bar; 210. Plastic sleeve;

[0038] 3. Arc bolt assembly; 301. Arc bolt; 302. Nut;

[0039] 4. Middle cushion layer. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model. In addition, the technical features involved in each embodiment of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0041] In the description of the present invention, it should be understood that, unless otherwise expressly specified and limited, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0045] The pipe segment 1 for improving the seismic toughness of a shield tunnel in the preferred embodiment of the utility model is mainly used in the application scenario of connecting the pipe segments 1 using the arc bolt assembly 3, aiming to improve the seismic toughness of the pipe segment connection structure formed after the connection with the arc bolt assembly 3 at the connection part.

[0046] In the present invention, for the above purpose, a tough component 2 is provided in the arc-shaped connecting hole 102 of the segment 1, and the tough component 2 is used to transmit and buffer the earthquake impact force between the arc-shaped bolt component 3 and the segment 1 structure.

[0047] As follows, the scheme in the utility model is specifically introduced and described through embodiments.

[0048] Example:

[0049] See also Figure 1~Figure 4The pipe segment 1 in the preferred embodiment of the utility model is preferably a reinforced concrete structure, and an arc-shaped arc-shaped connecting hole 102 is opened at the end for docking with the adjacent pipe segment 1, and when the two pipe segments 1 are aligned with their ends, the two sections of the arc-shaped connecting holes 102 are just aligned with their ends to form a continuous arc-shaped through hole.

[0050] Then, the arc-shaped bolt 301 can be passed through the inner wall surface of one pipe segment 1 and then passed through the inner wall surface of another pipe segment 1 to complete the matching connection with the nut 302 .

[0051] Specifically, the arc-shaped connecting hole 102 in the preferred embodiment is arranged at the end of the tube segment 1 for connection, and extends from the inner wall surface of the tube segment 1 along the arc line and passes through the end surface of the tube segment 1 for butt connection, such as Figure 1 as shown in .

[0052] During the actual setting, an installation hand hole 101 is opened on the inner wall surface of the pipe segment 1 to accommodate the end of the arc bolt 301, so as to prevent the two ends of the arc bolt 301 from protruding from the inner wall surface of the pipe segment 1, thereby ensuring the smoothness of the inner wall surface after the shield tunnel is completed.

[0053] In a preferred embodiment, the installation hand hole 101 is as follows Figure 1 The inner diameter of the square cone hole shown in the figure decreases from the outside to the inside. Correspondingly, one end of the arc-shaped connecting hole 102 is connected to the inner wall surface of the installation hand hole 101.

[0054] Furthermore, a tough component 2 is fixedly provided on the inner peripheral wall surface of the arc-shaped connecting hole 102. After two adjacent pipe segments 1 are butted at their ends, the two arc-shaped tough components 2 are also butted at their ends to form a continuous arc-shaped structure.

[0055] like Figure 2 As shown in the figure, the toughness component 2 in the preferred embodiment includes a first double sleeve 201 and a second double sleeve 202 arranged coaxially, an annular cavity is formed between the two double sleeves, and an axial toughness unit and a radial toughness unit are arranged in the annular cavity, so as to achieve radial seismic resistance and circumferential seismic resistance of the pipe segment 1.

[0056] For the first double sleeve 201 and the second double sleeve 202, the two have the same configuration, both including two coaxially sleeved sleeve units and a ball layer 203 disposed between the two sleeve units, and the only difference is the difference in the inner and outer diameter dimensions and the difference in the protruding parts of the ball layer 203. As follows, the structures of the two double sleeves are specifically introduced by taking the first double sleeve 201 as an example.

[0057] In a preferred embodiment, the first double tube 201 includes an outer tube unit and an inner tube unit coaxially nested, the outer diameter of the inner tube unit is smaller than the inner diameter of the outer tube unit, a cavity of a certain width is formed between the two, and the outer tube unit and the inner tube unit are arc-shaped.

[0058] At the same time, balls are arranged at intervals in the circumferential direction and the axial direction between the inner tube unit and the outer tube unit to form a ball layer 203 .

[0059] In more detail, the outer diameter of the ball is larger than the gap width between the inner tube unit and the outer tube unit, and a through hole is opened on the inner tube unit corresponding to each ball, and the inner diameter of each through hole is smaller than the outer diameter of the ball, so that one side of the ball embedded between the inner and outer tube units protrudes from the inner circumferential wall of the inner tube unit. With this arrangement, the corresponding component arranged between the two double sleeves can contact the surface of each ball in the first double sleeve 201 with its outer circumferential wall, thereby reducing the friction between the outer circumferential wall of the corresponding component and the first double sleeve 201.

[0060] Similarly, for the second double tube 202, it is not difficult to know that through holes are opened in the circumferential direction and the axial direction on the outer circumference of its outer tube unit, and a ball layer 203 is formed between the inner and outer tube units of the second double tube 202, and one side of each ball protrudes from the outer peripheral wall surface of the second double tube 202 (that is, the outer peripheral wall surface of the outer tube unit of the second double tube 202).

[0061] By utilizing the above arrangement of the two pairs of sleeves, both the inner and outer sides of the corresponding components arranged between the two pairs of sleeves can be assembled and contacted with the ball layer 203 .

[0062] In actual configuration, both ends of the two double sleeves and both ends of the annular cavity between the two double sleeves are respectively closed, and lubricating oil is injected between the outer tube unit and the inner tube unit of at least one double sleeve.

[0063] For example, in a specific preferred embodiment, annular sealing covers 208 are respectively provided at both ends of the arc-shaped connecting hole 102 to achieve sealing of both ends of the tough component 2.

[0064] More preferably, an openable and closable oil filling hole is provided on the annular cover 208 corresponding to at least one double tube, so that lubricating oil can be regularly injected between the inner tube unit and the outer tube unit of the corresponding double tube.

[0065] Furthermore, in the preferred embodiment, the axial toughness unit and the radial toughness unit arranged in the annular cavity between the two double sleeves are as follows: Figure 2 As shown in the figure, it includes a radial toughness unit located in the middle and two axial toughness units respectively arranged at the axial ends of the radial toughness unit.

[0066] Specifically, the radial toughness unit in the preferred embodiment includes a sleeve unit, namely a piston steel cylinder 204. The piston steel cylinder 204 is closed at both ends and includes an inner sleeve and an outer sleeve arranged coaxially, and an annular cylinder cavity is formed between the two sleeves. Correspondingly, the corresponding radial toughness unit is also provided with an annular steel bar 209 on the inner wall surface of the arc-shaped connecting hole 102, such as Figure 1 As shown in , its outer side is connected to the main steel bars of the pipe segment 1, and its inner side passes through the first double sleeve 201 and is fixed to the outer peripheral wall of the piston steel cylinder 204, for example, by welding.

[0067] It is easy to understand that the arrangement of the annular reinforcement 209 is equivalent to cutting off the first double sleeve 201 from the arrangement of the annular reinforcement 209, and forming first double sleeves 201 on both axial sides of the annular reinforcement 209. Preferably, one end of the two first double sleeves 201 close to the annular reinforcement 209 is preferably closed.

[0068] The axial position limitation of the axial toughness units at both ends can be effectively achieved by fixing the piston steel cylinder 204 to the inner wall of the arc-shaped connecting hole 102. At the same time, the hollow setting of the piston steel cylinder 204 enables it to have a certain radial deformation ability, thereby enabling the piston steel cylinder 204 to have a certain radial toughness.

[0069] Furthermore, in order to improve the radial buffering capacity of the radial toughness unit, a radial spring 205 is preferably radially arranged in the hollow cylinder cavity of the piston steel cylinder 204, and the two ends of the radial spring 205 respectively abut against the outer wall surface of the inner sleeve and the inner wall surface of the outer sleeve.

[0070] For the radial toughness unit in the preferred embodiment, it can be deformed in the radial direction when an earthquake occurs, and after the deformation of the extruded outer sleeve, the impact force is transmitted to each radial spring 205, and the toughness buffering is completed through the deformation of each radial spring 205.

[0071] In actual arrangement, the radial springs 205 between the inner sleeve and the outer sleeve are preferably arranged at equal intervals in the annular direction and / or in the axial direction.

[0072] The corresponding setting of the radial toughness unit enables the connection part of the pipe segment 1 to have a certain radial buffering capacity. However, under normal circumstances after the pipe segment 1 is connected and set (no disasters such as earthquakes, landslides, collapses, etc.), the radial toughness unit should be kept fixed in the arc-shaped connecting hole 102, and the setting of the annular steel bar 209 can meet the above requirements, thereby ensuring that the axial toughness units at both ends of the radial toughness unit can be in a state where the axial force is not concentrated under normal circumstances.

[0073] Of course, once a special situation such as an earthquake occurs, the connection between the piston steel cylinder 204 and the annular reinforcement 209 can be destroyed by the shear force. At this time, the piston steel cylinder 204 can perform piston movement axially in the annular cavity between the two pairs of sleeves, squeezing the axial toughness unit on one side of the axial direction.

[0074] Furthermore, the axial toughness unit in the preferred embodiment includes a plurality of axial ring plates 206 spaced apart in the axial direction, and an axial spring 207 is axially arranged between two adjacent axial ring plates 206 and between the axial ring plate 206 and the piston steel cylinder 204 .

[0075] In more detail, the two ends of the axial spring 207 are preferably fixedly arranged, and are arranged at intervals in the annular direction, and are further preferably arranged at equal intervals in the annular direction.

[0076] In actual configuration, the axial ring plate 206 is preferably made of an elastic memory material, which can deform axially when subjected to axial compression, thereby providing axial buffering. After the axial compression is completed, the axial ring plate 206 can automatically return to its original position due to its own "memory".

[0077] By correspondingly setting the two axial toughness units and the radial toughness unit, the toughness component 2 can have axial toughness and radial toughness, thereby improving the seismic toughness of the shield tunnel subsequently connected and set.

[0078] In addition, for the pipe segment 1 in the preferred embodiment, during actual setting, the tough component 2 is preferably assembled in advance, and its annular reinforcement 209 is welded and fixed to the internal reinforcement of the pipe segment 1, and then the pipe segment 1 is cast and formed to complete the fixation of the tough component 2 and the pipe segment 1.

[0079] As another aspect of the present invention, a preferred embodiment further provides a pipe segment connection structure based on the pipe segment 1, such as Figure 1 as shown in .

[0080] The pipe segment connection structure in the preferred embodiment includes two pipe segments 1 aligned with their ends, and the ends of the two pipe segments 1 are aligned with the ends of the arc-shaped connecting hole 102, so as to form a continuous arc-shaped through hole between the two pipe segments 1.

[0081] Furthermore, a plastic sleeve 210 is axially inserted into the arcuate through hole, and its two ends extend to the inner wall surfaces of the two mounting hand holes 101 respectively, thereby forming a continuously extending arcuate channel in the plastic sleeve 210 for inserting the arcuate bolt 301 .

[0082] Accordingly, the arc bolt 301 of the arc bolt assembly 3 penetrates from one end of the arc channel and exits from the other end of the arc channel, and its end is fastened by the nut 302, thereby realizing the connection between the two pipe segments 1, forming a Figure 1The segment connection structure shown in .

[0083] It can be understood that, in actual configuration, a plurality of connection positions may be provided on the outer circumference of each pipe segment 1 , that is, a tough connection between two pipe segments 1 is achieved through a combination structure of a plurality of arc-shaped bolts 301 and arc-shaped channels.

[0084] In actual setting, it is further preferred to arrange an intermediate cushion layer 4 between the two pipe segments 1, which is preferably a sheet structure made of elastic material, with a through hole formed in the middle that can be coaxially aligned with the arc channel, so that when the arc bolt 301 is inserted into the arc channel, the intermediate cushion layer 4 is just sleeved on the outer periphery of the middle part of the arc bolt 301.

[0085] By providing the intermediate cushion layer 4 , the sealing of the connection portion of the end of the segment 1 can be effectively ensured, thereby ensuring the reliability and stability of the settings of the ends of the two tough components 2 .

[0086] The pipe segment used for improving the seismic toughness of the shield tunnel in the utility model has a compact structure and is easy to set up and use. It can effectively improve the seismic toughness of the shield tunnel pipe segment, so that the shield tunnel can resist certain axial impacts and radial impacts when an earthquake occurs, thereby ensuring the structural stability of the shield tunnel under a certain impact force, thereby ensuring the safe operation of the shield tunnel, extending the service life of the shield tunnel, and having good practical value.

[0087] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A segment for improving the seismic toughness of a shield tunnel, wherein the end of the segment used for butting against an adjacent segment is provided with an arc-shaped connecting hole extending from the inner wall surface of the segment to the end surface; characterized in that: A tough component with closed ends is fixedly arranged on the inner wall surface of the arc-shaped connecting hole; The toughness component comprises a first double sleeve and a second double sleeve arranged coaxially; the outer diameter of the second double sleeve is smaller than the inner diameter of the first double sleeve, an annular cavity is formed between the two double sleeves, and an axial toughness unit and a radial toughness unit are arranged in the annular cavity; Both double sleeves include an outer tube unit and an inner tube unit that are coaxially arranged, and a ball layer formed by a plurality of spaced balls is arranged between the outer tube unit and the inner tube unit; the outer diameter of the balls is greater than the spacing between the corresponding outer tube unit and the inner tube unit, and the inner tube unit of the first double sleeve and the outer tube unit of the second double sleeve are respectively provided with a plurality of through holes that penetrate inside and outside and have an inner diameter smaller than the outer diameter of the balls, so that each ball passes through the through hole on a side close to the annular cavity and protrudes into the annular cavity; The radial toughness unit is coaxially arranged in the middle of the annular cavity, and axial toughness units are respectively arranged at the two axial ends thereof; the radial toughness unit comprises a piston steel cylinder which is hollow inside and in an arc shape, the two ends of the piston steel cylinder are closed, and the inner and outer wall surfaces thereof respectively abut against the surfaces of the two ball layers protruding into the annular cavity; and the outer peripheral wall surface of the piston steel cylinder is fixedly connected to the inner wall surface of the arc-shaped connecting hole through the annular steel bar passing through the first double sleeve; The axial toughness unit comprises a plurality of axial ring plates spaced apart in the axial direction, and an axial spring is arranged axially between two adjacent axial ring plates and between the axial ring plate and the end of the piston steel cylinder.

2. The segment for improving the seismic toughness of a shield tunnel according to claim 1, characterized in that: A plurality of radial springs are arranged radially in the hollow cylinder cavity of the piston steel cylinder.

3. The segment for improving the seismic toughness of a shield tunnel according to claim 2, characterized in that: The radial springs are arranged at equal intervals in the annular direction and / or in the axial direction.

4. The segment for improving the seismic toughness of a shield tunnel according to any one of claims 1 to 3, characterized in that: Lubricating oil is injected between the outer tube unit and the inner tube unit of at least one double tube.

5. The segment for improving the seismic toughness of a shield tunnel according to claim 4, characterized in that: Both ends of the two double sleeves are closed by annular covers respectively, and an openable and closable oil filling hole is provided on the annular cover corresponding to at least one double sleeve for regularly injecting lubricating oil between the inner tube unit and the outer tube unit of the corresponding double sleeve.

6. The segment for improving the seismic toughness of a shield tunnel according to any one of claims 1 to 3 and 5, characterized in that: The axial ring plate is made of elastic memory material, which can be compressed when subjected to axial extrusion and recover after the action is released.

7. The segment for improving the seismic toughness of a shield tunnel according to any one of claims 1 to 3 and 5, characterized in that: Both ends of the axial spring are fixedly connected to corresponding components, and the axial springs are arranged at equal intervals in the annular direction.

8. The segment for improving the seismic toughness of a shield tunnel according to any one of claims 1 to 3 and 5, characterized in that: The inner wall surface of the annular steel bar is welded to the outer peripheral wall surface of the first double sleeve, and the outer wall surface thereof is fixedly connected to the internal steel bars of the pipe segment.

9. A pipe segment connection structure, characterized in that: The segment connection structure is obtained by connecting two segments for improving the seismic toughness of a shield tunnel according to any one of claims 1 to 8 by aligning their ends and then connecting them with an arc bolt assembly; The arc-shaped connecting holes of the two pipe segments are aligned at their ends to form a continuous arc-shaped through hole, a plastic sleeve is axially passed through the arc-shaped through hole, and a continuously extending arc-shaped channel is formed in the plastic sleeve; The arc-shaped bolt assembly comprises an arc-shaped bolt and a nut. The arc-shaped bolt penetrates from one end of the arc-shaped channel and passes out from the other end of the arc-shaped channel. The nut is lockingly connected to the end of the arc-shaped bolt.

10. The pipe segment connection structure according to claim 9, characterized in that: An intermediate cushion layer is provided between the two pipe segments; The middle cushion layer is a sheet structure made of elastic material, and a through hole for the arc bolt to pass through is formed in the middle thereof. The arc bolt passes through the through hole in the middle of the middle cushion layer and sandwiches the middle cushion layer between the ends of two pipe segments.

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