A push type shield pipe, shield pipe segment and construction method

Abstract

The application relates to a push type shield pipeline, a shield segment and a construction method. The push type shield pipeline comprises a plurality of segment rings, the plurality of segment rings are assembled to form the shield pipeline along a shield advancing direction, each segment ring comprises a plurality of push type shield segments connected in a ring direction in sequence, each push type shield segment comprises a segment body, two end faces of each segment body along the shield advancing direction are respectively arranged as a jack facing surface and a jack back surface, a limiting cavity is arranged on the jack facing surface of the segment body, a socket is further arranged in the jack facing surface of the segment body, the socket is embedded on one side of the limiting cavity, a spigot is arranged on the jack back surface of the segment body, and the spigot protrudes out of the jack back surface; an elastic gasket is arranged between two adjacent segment bodies along the shield advancing direction, and the spigot of one of the segment bodies is inserted into the limiting cavity of the other segment body and is locked with the socket on one side of the limiting cavity.

Description

Technical Field

[0001] This application relates to the field of tunnel engineering, specifically to a snap-action shield tunnel, shield segments, and construction method. Background Technology

[0002] Currently, shield tunnels are widely used in subway, municipal, railway, highway transportation and water conservancy projects due to their fast construction speed and minimal disturbance. As the core component of tunnel lining, shield segments directly bear soil pressure, groundwater pressure and special loads, and the mechanical properties of their longitudinal joints determine the overall stress safety of the tunnel structure.

[0003] In related technologies, shield tunnel construction typically involves setting bolt holes at the front end of the tunnel segments and bolt handholes at the rear end. The segments are longitudinally connected by inserting bolts and tightening nuts. Because bolt holes and bolt handholes need to be reserved in the tunnel segments, the steel reinforcement in the segments needs to be broken or bent at the bolt handholes, which weakens the overall structural strength of the segments and reduces their load-bearing capacity. At the same time, the bolt holes are weak points in the tunnel waterproofing system. After the elastic waterproof sealing gasket on the outside of the segments fails, groundwater will seep into the tunnel through the bolt holes, affecting the tunnel's durability.

[0004] Therefore, it is necessary to design a new snap-action shield tunnel to overcome the above problems. Summary of the Invention

[0005] This application provides a snap-action shield tunnel, shield segments, and construction method, which can solve the technical problems in related technologies where adjacent segments are longitudinally connected by bolts, and the segment reinforcement needs to be broken or bent at the bolt holes, which weakens the overall structural strength of the segments and reduces their load-bearing capacity. At the same time, the bolt hole locations are weak points in the tunnel waterproofing system, and after the elastic waterproof sealing gasket on the outside of the segments fails, groundwater will seep into the tunnel through the bolt holes, affecting the tunnel's durability.

[0006] In a first aspect, embodiments of this application provide a snap-action shield tunneling pipe, comprising: multiple segment rings, which are assembled along the shield tunneling direction to form a shield tunneling pipe; each segment ring includes multiple snap-action shield tunneling segments connected in a circumferential direction; each snap-action shield tunneling segment includes a segment body; each segment body has two end faces along the shield tunneling direction respectively configured as an approaching jack face and a backing jack face; the segment body has a limiting cavity on the approaching jack face; the segment body also has a socket on the approaching jack face; the socket is pre-embedded in one side of the limiting cavity; the segment body has an insertion port on the backing jack face; an elastic gasket is sandwiched between two adjacent segment bodies along the shield tunneling direction, and the insertion port of one segment body is inserted into the limiting cavity of the other segment body and locked with the socket on one side of the limiting cavity.

[0007] In conjunction with the first aspect, in one embodiment, the segment body is provided with a rotating cavity communicating with the limiting cavity; the socket includes a locking device and a bolt connected to each other, the bolt being inserted into the limiting cavity through the rotating cavity and locked with the socket.

[0008] In conjunction with the first aspect, in one embodiment, the segment body is further provided with an operating cavity, the operating cavity is connected to the limiting cavity, and the operating cavity is directly opposite the rotating cavity. When the bolt is pressed from the operating cavity, the bolt extends and inserts into the limiting cavity and the operating cavity.

[0009] In conjunction with the first aspect, in one embodiment, the outlet of the operating cavity is provided with a pre-embedded sleeve, the pre-embedded sleeve is provided with a sealing plug, and the pre-embedded sleeve is threadedly connected to the sealing plug.

[0010] In conjunction with the first aspect, in one embodiment, the socket includes an interconnected insertion rod and an anchoring structure, the anchoring structure being embedded in the back jack surface of the segment body, the insertion rod protruding from the back jack surface, the insertion rod having a bolt hole, and the socket extending and inserting into the bolt hole.

[0011] In conjunction with the first aspect, in one embodiment, the anchoring structure includes multiple reinforcing bars, which are spaced apart and pre-embedded in the back jack surface of the segment body, and the multiple reinforcing bars are connected to the insertion rod through a limiting plate.

[0012] Secondly, this application provides a snap-action shield tunnel segment, comprising: a segment body and an elastic liner. The two ends of the segment body along the shield advancement direction are respectively configured as an approach jack face and a back jack face. The segment body has a limiting cavity on the approach jack face and a socket in the approach jack face, the socket being pre-embedded in one side of the limiting cavity. The back jack face of the segment body has an insertion port, the insertion port protruding from the back jack face, the insertion port being used to insert into the limiting cavity of an adjacent segment body and lock with the corresponding socket. The elastic liner is bonded to the approach jack face or the back jack face of the segment body.

[0013] Thirdly, this application provides a construction method for a snap-action shield tunnel, which includes the following steps: Based on the design values ​​of the preload force between the socket and spigot, the design values ​​of the shear bearing capacity of the socket, the design values ​​of the compressive bearing capacity of the spigot, the design values ​​of the tensile bearing capacity of the spigot, and the design values ​​of the shear bearing capacity of the spigot, determine the number and size of the socket and spigot corresponding to each segment body, as well as the uncompressed thickness and compressed thickness of the elastic gasket; For the precast tunnel segment body, the socket is pre-embedded in the front jack surface of the tunnel segment body, the spigot is pre-embedded in the back jack surface of the tunnel segment body, and the elastic gasket is bonded to the front jack surface or the back jack surface of the tunnel segment body. Using jacks, two adjacent push-type shield tunnel segments are pushed along the shield tunneling direction. The insertion port of one segment is inserted into the limiting cavity of the other segment and locked with the socket on one side of the limiting cavity.

[0014] In conjunction with the third aspect, in one embodiment, determining the number and size of the sockets and spigots corresponding to each segment body, as well as the uncompressed and compressed thicknesses of the elastic gaskets, based on the design values ​​of the preload force between the socket and spigot, the shear capacity of the socket, the compressive capacity of the spigot, the tensile capacity of the spigot, and the shear capacity of the spigot, includes: Calculate the internal forces of the tunnel segment based on the load borne by the tunnel boring machine. Based on the internal forces of the segment, calculate the design values ​​of the preload force between the socket and the spigot, the shear bearing capacity of the socket, the compressive bearing capacity of the spigot, the tensile bearing capacity of the spigot, and the shear bearing capacity of the spigot.

[0015] In conjunction with the third aspect, in one embodiment, the method of using jacks to push two adjacent push-type shield tunnel segments along the shield tunneling direction, wherein the insertion port of one segment body is inserted into the limiting cavity of the other segment body and locked with the socket on one side of the limiting cavity, includes: Insert the insert rod into the corresponding limiting cavity, use the jack to push the two adjacent segments along the shield tunneling direction, compress the elastic pad to the set compression thickness, and precisely align the bolt hole of the insert rod with the bolt rod. Insert the operating tool into the operating cavity, press the socket to extend the bolt and insert it into the bolt hole of the insert rod; Unload the jack to allow the elastic gasket to spring back, tightening the socket and spigot.

[0016] The beneficial effects of the technical solutions provided in this application include: By pre-embedding multiple sockets on the jacking surface of the tunnel segment body and multiple insertion holes on the back jacking surface, with each insertion hole inserted into the limiting cavity of the corresponding socket and the insertion hole and socket locked together, adjacent tunnel segments along the shield tunneling direction are connected. This avoids the impact of bolt installation on the tunnel segment structure and waterproofing capability. It solves the technical problem in related technologies where adjacent tunnel segments are longitudinally connected by bolts, requiring the segment reinforcement to be broken or bent at the bolt holes, which weakens the overall structural strength of the tunnel segment and reduces its load-bearing capacity. At the same time, the bolt hole locations are a weak link in the tunnel waterproofing system, and after the elastic waterproof sealing gasket on the outside of the tunnel segment fails, groundwater will seep into the tunnel through the bolt holes, affecting the tunnel's durability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a snap-action shield tunnel segment provided for an embodiment of this application; Figure 2 A schematic diagram of a snap-action shield tunnel provided for an embodiment of this application; Figure 3 A circumferential sectional view of a snap-action shield tunnel provided in an embodiment of this application; Figure 4 This is a schematic diagram illustrating the locking mechanism between the inner socket and spigot of a snap-action shield tunnel as provided in an embodiment of this application. Figure 5 A schematic diagram showing the socket pre-embedded in the main body of the tunnel segment, as provided in an embodiment of this application; Figure 6 This is a schematic diagram of the socket structure provided in an embodiment of this application; Figure 7 A schematic diagram showing the insertion port pre-embedded in the main body of the tunnel segment according to an embodiment of this application; Figure 8 This is a schematic diagram of the socket structure provided in an embodiment of this application.

[0019] In the diagram: 1. Main body of the tunnel segment; 11. Facing jack surface; 12. Rear jack surface; 13. Limiting cavity; 14. Rotating cavity; 15. Operating cavity; 2. Socket; 21. Locking device; 22. Bolt rod; 3. Insertion port; 31. Insert rod; 32. Anchoring structure; 321. Reinforcing bar; 322. Limiting plate; 4. Elastic gasket; 5. Embedded sleeve; 6. Sealing plug. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0021] This application provides a snap-action shield tunnel, shield segments, and construction method, which can solve the technical problem that adjacent segments are longitudinally connected by bolts, and the steel bars of the segments need to be broken or bent at the bolt holes, which weakens the overall structural strength of the segments and reduces their load-bearing capacity. At the same time, the bolt hole locations are weak points in the tunnel waterproofing system. After the elastic waterproof sealing gasket on the outside of the segments fails, groundwater will seep into the tunnel through the bolt holes, affecting the durability of the tunnel.

[0022] See Figure 1-4 As shown in the figure, this application provides a snap-action shield tunneling pipe, which includes: multiple segment rings, the multiple segment rings being assembled along the shield tunneling direction to form a shield tunneling pipe, each segment ring including multiple snap-action shield tunneling segments connected in sequence in a circumferential direction, each snap-action shield tunneling segment including a segment body 1, each segment body 1 having two end faces along the shield tunneling direction respectively configured as a facing jack face 11 and a back jack face 12, the segment body 1 having a limiting cavity 13 on the facing jack face 11. The segment body 1 is provided with a socket 2 in the jacking surface 11. The socket 2 is embedded in one side of the limiting cavity 13. The back jacking surface 12 of the segment body 1 is provided with an insertion port 3, which protrudes from the back jacking surface 12. An elastic pad 4 is sandwiched between two adjacent segment bodies 1 along the shield tunneling direction. The insertion port 3 of one segment body 1 is inserted into the limiting cavity 13 of the other segment body 1 and locked with the socket 2 on one side of the limiting cavity 13.

[0023] In this embodiment, two adjacent segments 1 of each segment ring are connected circumferentially by bolts. The elastic gasket 4 is bonded to the jacking surface 11 or the back jacking surface 12 of each segment 1. The elastic gasket 4 is provided between two adjacent segments to provide pre-tightening force for the socket 2 and the spigot 3. Exemplarily, three sockets 2 are provided in the jacking surface 11 of each segment 1, and three spigots 3 are provided in the back jacking surface 12 of each segment 1. Two adjacent segments 1 along the shield tunneling direction are longitudinally connected by locking the sockets 2 and the corresponding spigots 3, avoiding the impact of bolt installation on the segment structure and waterproofing capability.

[0024] This embodiment pre-embeds multiple sockets 2 on the jacking surface 11 of the main tunnel segment 1 and multiple insertion ports 3 on the jacking surface 12 of the main tunnel segment 1. Each insertion port 3 is inserted into the limiting cavity 13 of the corresponding socket 2, and the insertion port 3 and the socket 2 are locked together, so that two adjacent main tunnel segments 1 along the shield tunneling direction are connected. This avoids the impact of bolt settings on the tunnel segment structure and waterproofing capability. It solves the technical problem in related technologies where adjacent tunnel segment rings are longitudinally connected by bolts, and the tunnel segment reinforcement needs to be broken or bent at the bolt holes, which weakens the overall structural strength of the tunnel segment and reduces the load-bearing capacity of the tunnel segment. At the same time, the bolt hole position is a weak link in the tunnel waterproofing system. After the elastic waterproof sealing gasket on the outside of the tunnel segment fails, groundwater will seep into the tunnel through the bolt holes, affecting the durability of the tunnel.

[0025] Further, see Figure 4-6 As shown, in some embodiments, the main body 1 of the segment is provided with a rotating cavity 14 that communicates with the limiting cavity 13; the socket 2 includes a locking device 21 and a bolt 22 connected to each other, the bolt 22 is inserted into the limiting cavity 13 through the rotating cavity 14 and locked with the socket 3.

[0026] In this embodiment, the rotating cavity 14 is used to accommodate the bolt 22. In the initial state, the locking device 21 maintains the bolt 22 in a retracted state. The bolt 22 is pre-embedded in the rotating cavity 14 and located on one side of the limiting cavity 13. When the socket 3 is inserted into the limiting cavity 13 and the bolt 22 is pressed, the bolt 22 protrudes, enters the limiting cavity 13, and locks with the socket 3. The locking device 21 maintains the protruding state of the bolt 22. In other embodiments, the socket 2 can be set as a bolt or a pin. The socket 2 is inserted into the corresponding socket 3 and locks with the socket 3.

[0027] Further, see Figure 4-6 As shown, in some embodiments, the main body 1 of the tube segment is further provided with an operating cavity 15, which is connected to the limiting cavity 13 and is directly opposite to the rotating cavity 14. When the bolt 22 is pressed from the operating cavity 15, the bolt 22 extends and is inserted into the limiting cavity 13 and the operating cavity 15.

[0028] In this embodiment, the operating cavity 15 not only provides operating space for the bolt 22, but also provides movement space for the bolt 22. The rotating cavity 14 and the operating cavity 15 form a directional extension and retraction path for the bolt 22. When the bolt 22 is pressed from the operating cavity 15, the bolt 22 extends and enters the operating cavity 15 through the limiting cavity 13, thereby locking the socket 2 and the insertion port 3.

[0029] Further, see Figure 1 , Figure 4 and Figure 5 As shown, in some embodiments, the outlet of the operating cavity 15 is provided with a pre-embedded sleeve 5, and a sealing plug 6 is provided inside the pre-embedded sleeve 5. The pre-embedded sleeve 5 is threadedly connected to the sealing plug 6.

[0030] In this embodiment, the inner cavity of the pre-embedded sleeve 5 is connected to the operating cavity 15. The sealing plug 6 seals the opening of the pre-embedded sleeve 5 and is located on the inner arc surface of the pipe body. The inner surface of the pre-embedded sleeve 5 is provided with threads, and the outer surface of the sealing plug 6 is provided with threads. The thread size of the sealing plug 6 matches the thread size of the pre-embedded sleeve 5. The threads form a spiral path to extend the seepage channel. During the process of the sealing plug 6 being screwed into the pre-embedded sleeve 5, the sealing plug 6 generates axial pressure, which makes the sealing plug 6 fit tightly with the pre-embedded sleeve 5, increasing the sealing stability of the sealing plug 6.

[0031] Further, see Figure 4 , Figure 7 and Figure 8 As shown, in some embodiments, the socket 3 includes an interconnected insertion rod 31 and an anchoring structure 32. The anchoring structure 32 is pre-embedded in the back jack surface 12 of the segment body 1. The insertion rod 31 protrudes from the back jack surface 12 and is provided with a bolt hole. The socket 2 extends and is inserted into the bolt hole.

[0032] In this embodiment, the anchoring structure 32 is pre-embedded in the reinforced concrete of the segment body 1. The shape of the bolt hole matches that of the bolt rod 22, and the socket 2 is aligned with the insertion port 3, that is, the bolt rod 22 is aligned with the bolt hole. When the insertion rod 31 is inserted into the limiting cavity 13 and the bolt rod 22 is pressed, the bolt rod 22 extends and inserts into the bolt hole, thereby locking the socket 2 and the insertion port 3.

[0033] Further, see Figure 7 and Figure 8 As shown, in some embodiments, the anchoring structure 32 includes multiple reinforcing bars 321, which are spaced apart and pre-embedded in the back jack surface 12 of the segment body 1, and the multiple reinforcing bars 321 are connected to the insertion rod 31 through a limiting plate 322.

[0034] In this embodiment, the extension directions of the multiple reinforcing bars 321 are parallel to the extension direction of the insertion rod 31, and they are symmetrically arranged along the axis of the insertion rod 31. The longitudinal load borne by the insertion rod 31 is evenly transferred to the reinforced concrete in the segment body 1 through the multiple reinforcing bars 321, thereby improving the tensile strength of the insertion joint 3. Exemplarily, the multiple reinforcing bars 321 are configured as four reinforcing bars 321, which are pre-embedded in the back jack surface 12 of the segment body 1. The top surface of the limiting plate 322 is arranged parallel to the back jack surface 12. In other embodiments, the anchoring structure 32 can be configured as a textured connecting rod or other anchoring structures.

[0035] See Figure 1 As shown in the figure, this application provides a snap-action shield tunnel segment, which includes: a segment body 1 and an elastic gasket 4. The two ends of the segment body 1 along the shield advancement direction are respectively set as an approach jack surface 11 and a back jack surface 12. The segment body 1 has a limiting cavity 13 on the approach jack surface 11. The segment body 1 also has a socket 2 in the approach jack surface 11. The socket 2 is pre-embedded in one side of the limiting cavity 13. The back jack surface 12 of the segment body 1 has an insertion port 3. The insertion port 3 protrudes from the back jack surface 12 and is used to insert into the limiting cavity 13 of the adjacent segment body 1 and lock with the corresponding socket 2. The elastic gasket 4 is bonded to the approach jack surface 11 or the back jack surface 12 of the segment body 1.

[0036] In this embodiment, each segment body 1 is provided with one or more sockets 2 in the jacking surface 11, and each segment body 1 is provided with one or more insertion ports 3 in the back jacking surface 12. An elastic gasket 4 is provided between two adjacent segment bodies 1 to provide pre-tightening force for the sockets 2 and insertion ports 3. Exemplarily, each segment body 1 is provided with three sockets 2 in the jacking surface 11, and each segment body 1 is provided with three insertion ports 3 in the back jacking surface 12. Two adjacent segment bodies 1 along the shield tunneling direction are longitudinally connected by locking the sockets 2 and the corresponding insertion ports 3, avoiding the impact of bolt settings on the segment structure and waterproofing capability.

[0037] This application provides a construction method for a snap-action shield tunnel, which includes the following steps: S1: Based on the design values ​​of the preload force between the socket 2 and the spigot 3, the design values ​​of the socket shear bearing capacity, the design values ​​of the spigot compressive bearing capacity, the design values ​​of the spigot tensile bearing capacity, and the design values ​​of the spigot shear bearing capacity, determine the number and size of the socket 2 and the spigot 3 corresponding to each segment body 1, as well as the uncompressed thickness and compressed thickness of the elastic gasket 4.

[0038] S2: For the precast segment body 1, the socket 2 is pre-embedded in the jacking surface 11 of the segment body 1, the spigot 3 is pre-embedded in the back jacking surface 12 of the segment body 1, and the elastic gasket 4 is bonded to the jacking surface 11 or the back jacking surface 12 of the segment body 1.

[0039] S3: Using jacks to push two adjacent snap-action shield segments along the shield tunneling direction, the insertion port 3 of one segment body 1 is inserted into the limiting cavity 13 of the other segment body 1 and locked with the socket 2 on one side of the limiting cavity 13.

[0040] In this embodiment, two adjacent segments 1 of each segment ring are connected by bolts. The elastic gasket 4 is bonded to the jacking surface 11 or the back jacking surface 12 of each segment 1. The elastic gasket 4 is provided between two adjacent segments to provide pre-tightening force for the socket 2 and the spigot 3. Two adjacent segments 1 along the shield tunneling direction are longitudinally connected by locking the socket 2 and the corresponding spigot 3, thus avoiding the impact of bolt installation on the segment structure and waterproofing capability.

[0041] Further, in some embodiments, determining the number and size of the sockets 2 and 3 corresponding to each segment body 1, as well as the uncompressed and compressed thicknesses of the elastic gasket 4, based on the design values ​​of the preload force between the socket 2 and the spigot 3, the shear capacity of the socket, the compressive capacity of the spigot, the tensile capacity of the spigot, and the shear capacity of the spigot, includes: S101: Calculate the internal forces of the tunnel segment body based on the load borne by the tunnel boring machine.

[0042] S102: Based on the internal forces of the segment body, calculate the design values ​​of the preload force between socket 2 and spigot 3, the design values ​​of the shear bearing capacity of the socket, the design values ​​of the compressive bearing capacity of the spigot, the design values ​​of the tensile bearing capacity of the spigot, and the design values ​​of the shear bearing capacity of the spigot.

[0043] In this embodiment, based on the load borne by the tunnel boring machine (TBM), the numerical or analytical solutions of the internal forces of the main body 1 of the tunnel segment are calculated using finite element software or calculation formulas. Based on the tunnel segment structural dimensions, the internal forces of the main body of the tunnel segment, and the parameters of the TBM equipment, the material and quantity of the socket 2 and spigot 3 corresponding to each main body 1 of the tunnel segment, as well as the design parameters such as the material, area, uncompressed thickness, and compressed thickness of the elastic gasket 4, are determined. Based on the numerical solution of the internal forces of the main body of the tunnel segment, the design value of the preload between the socket 2 and spigot 3 is calculated. The design value of the preload between a single socket 2 and spigot 3 satisfies the following formula: In the formula This refers to the design value of the preload force between a single socket 2 and spigot 3. This is the structural importance coefficient. The partial factor for the effect, The elastic modulus of the elastic pad. The projected area of ​​the elastic gasket corresponding to each segment ring. The uncompressed thickness of elastic pad 4, The compression thickness of the elastic pad 4, Determine the number of sockets 2 and spigots 3 for each segment ring; calculate the design value of the socket shear capacity based on the design parameters. The design value of the socket shear capacity satisfies the following formula. In the formula This is the design value of the shear bearing capacity of the socket. This is the design value for the shear strength of the bolt. Let be the cross-sectional area of ​​the bolt rod; based on the design parameters, calculate the design value of the compressive bearing capacity of the spigot. The design value of the compressive bearing capacity of the spigot satisfies the following formula. In the formula This is the design value for the compressive bearing capacity of the socket. This is the design value for the compressive strength of the bolt hole. Let be the projected area of ​​the contact surface between the bolt hole and the bolt rod; calculate the design value of the tensile bearing capacity of the spigot based on the design parameters. The design value of the tensile bearing capacity of the spigot satisfies the following formula: In the formula This is the design value for the tensile bearing capacity of the socket. This is the design value for the tensile strength of the bolt hole. Let be the net cross-sectional area at the bolt hole; based on the design parameters, calculate the design value of the shear capacity of the spigot. The design value of the shear capacity of the spigot satisfies the following formula: In the formula This is the design value for the shear capacity of the spigot joint. This is the design value for the shear strength of the insertion rod. Let the cross-sectional area of ​​the insertion rod be . This is the design value for the inter-ring shear force. The number of sockets 2 and spigots 3 for each segment ring.

[0044] Based on the segment structure dimensions, internal forces within the segment body, and design parameters of the tunnel boring machine, the structural safety level is set to Level 1, with inter-ring design values... The number of sockets 2 and spigots 3 in each segment ring The socket 2 and spigot 3 are made of carbon structural steel. The cross-section of the bolt 22 is circular, and the diameter of the bolt 22 is 36 mm. The cross-section of the insert 31 is rectangular, and the width of the insert 31 is 70 mm, the thickness of the insert 31 is 30 mm, and the diameter of the bolt hole is 38 mm. The elastic gasket 4 is made of cork rubber, and the elastic modulus of the elastic gasket is... The projected area of ​​the elastic gasket corresponding to each segment ring The uncompressed thickness of elastic pad 4 =2mm, compression thickness of elastic pad 4 =1 mm, calculate the design value of the preload force between a single socket 2 and spigot 3. =247kN, check the design value of the shear bearing capacity of the socket. =1017 mm 2 , =346kN≥247kN, indicating that the shear bearing capacity of the socket meets the requirements. The design value of the compressive bearing capacity of the spigot is then checked. =1080 mm 2 , =319kN≥247kN, indicating that the compressive bearing capacity of the socket meets the requirements. The design value of the tensile bearing capacity of the socket is then checked. =960 mm 2 , =283kN≥247kN, indicating that the tensile bearing capacity of the socket meets the requirements. The design value of the shear bearing capacity of the socket is then checked. =2100 mm 2 , =357kN≥138kN, indicating that the shear bearing capacity of the spigot meets the requirements.

[0045] Furthermore, in some embodiments, the method of using jacks to push two adjacent push-type shield tunnel segments along the shield tunneling direction, wherein the insertion port 3 of one segment body 1 is inserted into the limiting cavity 13 of the other segment body 1 and locked with the socket 2 on one side of the limiting cavity 13, includes: S301: Insert the insertion rod 31 into the corresponding limiting cavity 13, use the jack to push the two adjacent segments 1 along the shield tunneling direction, compress the elastic pad 4 to the set compression thickness, and precisely align the bolt hole of the insertion rod 31 with the bolt rod 22.

[0046] S302: Insert the operating tool into the operating cavity 15, press the socket 2 to extend the bolt 22 and insert it into the bolt hole of the insert rod 31.

[0047] S303: Unload the jack to allow the elastic gasket 4 to spring back, tightening the socket 3 and the receptacle 2.

[0048] In this embodiment, the insertion rod 31 is first inserted into the corresponding limiting cavity 13 to align the insertion port 3 and the socket 2. A jack is used to push two adjacent segments 1 along the shield tunneling direction, compressing the elastic gasket 4 to a set compression thickness. The bolt hole of the insertion rod 31 is precisely aligned with the bolt rod 22. Then, an operating tool is inserted into the operating cavity 15, and the bolt rod 22 is pressed, causing it to protrude and extend into the bolt hole of the insertion rod 31, locking the socket 2 and the insertion port 3. The locking device 21 maintains the protruding state of the bolt rod 22. The pre-embedded sleeve 5 is aligned with the sealing plug 6 and tightened to seal the operating cavity 15. Finally, the jack is unloaded, and the elastic gasket 4 rebounds, tightening the insertion port 3 and the socket 2. The elastic gasket 4 provides pre-tightening force to the insertion port 3 and the socket 2.

[0049] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0050] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0051] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A snap-action shield tunnel, characterized in that, It includes: Multiple tunnel segment rings are assembled along the shield tunneling direction to form a shield tunnel. Each tunnel segment ring includes multiple snap-action shield tunnel segments connected in a circumferential direction. Each snap-action shield tunnel segment includes a tunnel segment body (1). Each tunnel segment body (1) has two ends along the shield tunneling direction, which are respectively set as a jacking face (11) and a back jacking face (12). The tunnel segment body (1) has a limiting cavity (13) on the jacking face (11). The tunnel segment body (1) also has a socket (2) in the jacking face (11). The socket (2) is embedded in one side of the limiting cavity (13). The back jacking face (12) of the tunnel segment body (1) has a spigot (3). The spigot (3) protrudes from the back jacking face (12). An elastic pad (4) is sandwiched between two adjacent segments (1) along the tunnel boring machine advancing direction, and the insertion port (3) of one segment (1) is inserted into the limiting cavity (13) of the other segment (1) and locked with the socket (2) on one side of the limiting cavity (13).

2. The snap-action shield tunnel as described in claim 1, characterized in that, The main body of the tube segment (1) is provided with a rotating cavity (14) that communicates with the limiting cavity (13). The socket (2) includes a locking device (21) and a bolt (22) connected to each other. The bolt (22) is inserted into the limiting cavity (13) through the rotating cavity (14) and locked with the socket (3).

3. The snap-action shield tunnel as described in claim 2, characterized in that, The main body (1) of the tube segment is also provided with an operating cavity (15), which is connected to the limiting cavity (13) and is directly opposite to the rotating cavity (14). When the bolt (22) is pressed from the operating cavity (15), the bolt (22) extends and is inserted into the limiting cavity (13) and the operating cavity (15).

4. The snap-action shield tunnel as described in claim 3, characterized in that, The outlet of the operating chamber (15) is provided with a pre-embedded sleeve (5), and a sealing plug (6) is provided inside the pre-embedded sleeve (5). The pre-embedded sleeve (5) is threadedly connected to the sealing plug (6).

5. The snap-action shield tunnel as described in claim 1, characterized in that, The socket (3) includes a plug rod (31) and an anchoring structure (32) connected to each other. The anchoring structure (32) is embedded in the back jack surface (12) of the segment body (1). The plug rod (31) protrudes from the back jack surface (12). The plug rod (31) is provided with a bolt hole. The socket (2) extends and is inserted into the bolt hole.

6. The snap-action shield tunnel as described in claim 5, characterized in that, The anchoring structure (32) includes multiple steel bars (321), which are spaced apart and pre-embedded in the back jack surface (12) of the segment body (1). The multiple steel bars (321) are connected to the insertion rod (31) through a limiting plate (322).

7. A snap-action shield tunnel segment, characterized in that, It includes: The segment body (1) has two ends along the shield tunneling direction, which are respectively set as the facing jack face (11) and the back jack face (12). The segment body (1) has a limiting cavity (13) on the facing jack face (11). The segment body (1) also has a socket (2) in the facing jack face (11). The socket (2) is embedded in one side of the limiting cavity (13). The back jack face (12) of the segment body (1) has a socket (3). The socket (3) protrudes from the back jack face (12). The socket (3) is used to insert into the limiting cavity (13) of the adjacent segment body (1) and lock with the corresponding socket (2). Elastic pad (4) is bonded to the front jack surface (11) or the back jack surface (12) of the segment body (1).

8. A construction method for a snap-action shield tunnel as described in any one of claims 1-6, characterized in that, It includes the following steps: Based on the design values ​​of the preload force between the socket (2) and the spigot (3), the design values ​​of the shear bearing capacity of the socket, the design values ​​of the compressive bearing capacity of the spigot, the design values ​​of the tensile bearing capacity of the spigot, and the design values ​​of the shear bearing capacity of the spigot, determine the number and size of the socket (2) and the spigot (3) corresponding to each segment body (1), as well as the uncompressed thickness and compressed thickness of the elastic gasket (4); The precast segment body (1) has a socket (2) embedded in the jacking surface (11) of the segment body (1), a spigot (3) embedded in the back jacking surface (12) of the segment body (1), and an elastic gasket (4) bonded to the jacking surface (11) or the back jacking surface (12) of the segment body (1). Using jacks, two adjacent push-type shield tunnel segments are pushed along the shield tunneling direction. The insertion port (3) of one segment body (1) is inserted into the limiting cavity (13) of the other segment body (1) and locked with the socket (2) on one side of the limiting cavity (13).

9. The construction method as described in claim 8, characterized in that, The determination of the number and size of the sockets (2) and spigots (3) corresponding to each segment body (1) based on the design values ​​of the preload force between the socket (2) and the spigot (3), the shear bearing capacity of the socket, the compressive bearing capacity of the spigot, the tensile bearing capacity of the spigot, and the shear bearing capacity of the spigot, and the determination of the uncompressed thickness and compressed thickness of the elastic gasket (4) include: Calculate the internal forces of the tunnel segment based on the load borne by the tunnel boring machine. Based on the internal forces of the segment body, calculate the design values ​​of the preload force between the socket (2) and the spigot (3), the design values ​​of the shear bearing capacity of the socket, the design values ​​of the compressive bearing capacity of the spigot, the design values ​​of the tensile bearing capacity of the spigot, and the design values ​​of the shear bearing capacity of the spigot.

10. The construction method as described in claim 8, wherein the socket (2) comprises a locking device (21) and a bolt (22) connected to each other, and the insertion port (3) comprises a insertion rod (31) and an anchoring structure (32) connected to each other, characterized in that, The method of using jacks to push two adjacent push-type shield tunnel segments along the shield tunneling direction, wherein the insertion port (3) of one segment body (1) is inserted into the limiting cavity (13) of the other segment body (1) and locked with the socket (2) on one side of the limiting cavity (13), includes: Insert the insert rod (31) into the corresponding limiting cavity (13), use the jack to push the two adjacent segments (1) along the shield tunneling direction, compress the elastic pad (4) to the set compression thickness, and precisely align the bolt hole of the insert rod (31) with the bolt rod (22); Insert the operating tool into the operating cavity (15), press the socket (2) to extend the bolt (22) and insert it into the bolt hole of the insert (31); Unload the jack to allow the elastic pad (4) to spring back, and tighten the socket (3) and the receptacle (2).

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