Detachable negative ring pipe joint for socket type segment shield tunnel and construction method of detachable negative ring pipe joint

Abstract

The invention relates to the technical field of shield tunnel construction, and provides a detachable negative ring pipe joint for a socket type segment shield tunnel and a construction method of the detachable negative ring pipe joint. The detachable negative ring pipe joint comprises negative ring segments, quick connecting pieces and screw joint pieces, and the adjacent negative ring segments are axially connected through the quick connecting pieces; the adjacent negative ring pipe pieces are connected in the annular direction through the screw joint pieces, the quick connecting piece comprises a threaded sleeve, a connecting rod and a shaft sleeve, the threaded sleeve and the shaft sleeve are pre-buried at the two ends of each negative ring pipe piece respectively, the connecting rod is connected with the two negative ring pipe pieces, one end of the connecting rod is in threaded connection with the threaded sleeve of one negative ring pipe piece, and the other end of the connecting rod is in threaded connection with the shaft sleeve. And the other end is inserted into the shaft sleeve of the other negative ring duct piece. The detachable negative ring pipe joint provided by the invention is convenient to disassemble, the damage rate during disassembly is reduced, the repeated utilization of the negative ring pipe joint is realized, and the production cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of shield tunnel construction, and in particular to a detachable negative ring pipe segment for a socket-and-spigot type segment shield tunnel and a construction method thereof. Background Art

[0002] During shield tunnel lining construction, the tunnel is formed by connecting multiple segments longitudinally, and each segment is formed by connecting multiple arc-shaped segments (also known as segments) circumferentially. In the prior art, shield tunnel segments are commonly connected using bolted connectors, i.e., bolts and nuts. Currently, domestically developed and applied socket-and-spigot segments as shield tunnel lining structures. These longitudinal joints (i.e., the circumferential connection between adjacent segments) do not require bolted connectors, but instead use CT-type slide-in connectors. Circumferential joints (i.e., the axial connection between adjacent segments) use threaded quick connectors, with nuts pre-embedded within the segments. This design offers advantages such as quick installation, high construction efficiency, minimal deformation, and reasonable stress distribution. It effectively reduces tunnel misalignment, leakage, and other problems, significantly improves tunnel quality, and enhances long-term stability and safety. It is an advanced segment connector. However, due to the inherent structural characteristics of the threaded quick connector, socket-and-spigot segments cannot be disassembled using conventional methods once assembled, and can only be dismantled by force. After disassembly, the segments become damaged and difficult to reuse. On the other hand, CT connectors have high installation precision, and after the pipe segments are deformed, they are difficult to remove as easily as bolt-connected pipe segments. They need to be pulled out forcefully or even destructively disconnected to remove the pipe segments.

[0003] During shield construction, the negative ring pipe segment is a temporary structure that provides reaction force for the shield machine to start. It is installed in front of the tunnel entrance section as a temporary structure to provide support for the shield machine to prevent it from being pushed back by the reverse thrust during excavation. When the shield machine enters the conventional shield tunnel section, the friction between the main line tunnel segment and the surrounding strata can prevent the shield machine from retreating. The negative ring pipe segment can be dismantled and recycled after the main line tunnel has been excavated for a certain distance, and can be reused for shield starts in other tunnels to save engineering construction costs.

[0004] Therefore, solving the problem of non-destructive removal of the negative ring pipe joint of the socket-type pipe segment is conducive to the further development of this technology and is of great significance to the improvement and promotion of this technology.

[0005] Invention patent CN116220735A, "A detachable socket-type negative ring pipe body and its use method," provides a solution for the non-destructive removal of the socket-type segment negative ring pipe body (i.e., pipe segment), which can solve the problem to a certain extent. However, the method described in this invention patent uses grid-type steel pipe segments, does not fully utilize the mainline pipe segment template, and uses a special connection conversion to connect with the mainline tunnel pipe segment. The connection structure is complex, and the removal of the pipe segment requires special tooling design, which increases project investment. Therefore, it is necessary to develop a better detachable negative ring pipe segment and its construction method for socket-type pipe segment shield tunnels. Summary of the Invention

[0006] In view of the above, the present invention provides a detachable negative ring pipe segment for a socket-type segment shield tunnel, which is easy to dismantle and improves the reuse rate of the negative ring pipe segment, and a construction method thereof. It fully utilizes the mainline tunnel pipe segment template, has a simple connection form, and a convenient dismantling method, improves the reuse rate of the negative ring pipe segment, saves costs, and is conducive to low-carbon and sustainable development of engineering construction.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A detachable negative ring pipe segment for a socket-type segment shield tunnel comprises a negative ring segment, a quick connector and a screw connector. Adjacent negative ring segments are connected axially by the quick connector, and adjacent negative ring segments are connected circumferentially by the screw connector. The quick connector comprises a threaded sleeve, a connecting rod and a shaft sleeve. The threaded sleeve and the shaft sleeve are respectively pre-buried at both ends of each negative ring segment. The connecting rod connects the two negative ring segments. One end of the connecting rod is screwed to the threaded sleeve of one negative ring segment, and the other end is inserted into the shaft sleeve of the other negative ring segment.

[0009] Furthermore, one end of the connecting rod that is threaded in the threaded sleeve has an external thread to form a threaded end, and the other end is configured as a stepped pin to form a plug end.

[0010] Furthermore, connecting grooves for installing screw connectors are formed on both sides of each of the negative ring segments, and each connecting groove has a notch portion and a perforated portion. The notch portion is opened on the inner surface of the negative ring segment and adjacent to the side wall surface, forming a partition wall with the side wall surface of the negative ring segment. The perforated portion passes through the partition wall, and the side walls of the two negative ring segments are fitted together. The corresponding perforated portions on the side walls are aligned and connected. The bolts of the screw connector are inserted from the notch portion of one negative ring segment and pass through the two perforated portions to enter the notch portion of the other negative ring segment. The nut of the screw connector is screwed to the protruding end of the bolt.

[0011] In addition, the present invention necessarily provides a shield tunnel masonry structure having the negative ring pipe segment.

[0012] A shield tunnel masonry structure comprises a mainline tunnel segment and a detachable negative ring segment installed at the front end of the mainline tunnel segment. The mainline tunnel segment comprises a mainline segment, a double-end threaded member and a CT-type slide-in connector. Adjacent mainline segments are connected axially by the double-end threaded member and connected along the ring line by the CT-type slide-in connector.

[0013] Furthermore, the positive line segments and the negative ring segments have the same shape and size and are made by pouring concrete using the same set of molds. During the production of the positive line segments, threaded caps are placed at both ends of the mold for embedding, and C-type connectors and T-type connectors are placed on both sides of the mold. During the production of the negative ring segments, a threaded sleeve is placed at one end of the mold and a shaft sleeve is placed at the other end of the mold, and connecting grooves for installing threaded connectors are formed on both sides of the mold.

[0014] Furthermore, the double-end threaded member includes a threaded cap and a double-end threaded member. The threaded cap is embedded at both ends of each main line segment. The double-end threaded member includes a middle part and threaded segments formed at both ends of the middle part. By screwing the threaded segments at both ends of the double-end threaded member into the threaded caps of the two main line segments respectively, the adjacent main line segments are connected axially.

[0015] Furthermore, the CT-type slide-in connector includes a C-type connector and a T-type connector, which are respectively embedded on both sides of each main line segment. A C-type groove is formed on the C-type connector, and a port for sliding into is provided at one end of the C-type groove. The T-type connector has a T-type buckle, and the T-type buckle of the T-type connector of one main line segment slides into the C-type groove of another main line segment through the port, thereby connecting the two adjacent main line segments in a circumferential direction.

[0016] In addition, the present invention also provides a construction method for the above-mentioned shield tunnel masonry structure, comprising the following implementation steps:

[0017] S1. Design the molds for the negative ring pipe segment and the mainline tunnel pipe segment so that the longitudinal seam connection between the negative ring pipe segment and the mainline tunnel pipe segment is suitable for replacement using CT-type slide-in connectors or screw connectors. When manufacturing the negative ring pipe segment, connection grooves for installing screw connectors are formed on both sides of the mold. When manufacturing the mainline tunnel pipe segment, C-type connectors and T-type connectors are embedded on both sides of the mold.

[0018] S2: Use the mold to first produce the negative ring segments of the negative ring segment. After the negative ring segments are produced, modify the mold and adjust the screw joints of the longitudinal seam connection to CT-type slide-in connectors to produce the positive line segments of the main line tunnel segment.

[0019] S3, the shield starting stage, the negative ring segments are assembled to form negative ring segments, and the negative ring segments are axially connected to form negative ring segments. The annular joints between the negative ring segments are connected with quick connectors, and the longitudinal joints between the negative ring segments are connected with screw connectors. A reaction frame is installed at the end of the negative ring segment opposite the mainline tunnel, and steel wire ropes and steel plates are installed along the axial direction to reinforce the negative ring segment.

[0020] S4: The shield tunneling is carried out normally, and the mainline tunnel segments are assembled;

[0021] S5, when the conditions for removing the negative ring pipe segment are met, remove the reaction frame, and remove the steel wire ropes reinforcing the negative ring pipe segment and the connecting steel plates between the negative ring pipe segments;

[0022] S6, dismantle the negative ring pipe segment. The dismantling order is: dismantle the entire segment from the reaction frame toward the main line tunnel. The dismantling order of the single ring segment is from top to bottom.

[0023] Among them, in S3, the construction method of the negative ring pipe joint is as follows:

[0024] (1) Assemble the first ring of negative ring pipe segments in the order of "standard block → adjacent block → capping block", fix them with the reaction frame, and reinforce them with steel wire ropes and steel plates to ensure the true roundness of the negative ring pipe segments;

[0025] (2) Continue to assemble the next negative ring segment in the order of "standard block → adjacent block → capping block". The annular seam is connected with a quick connector, where the threaded end is screwed into the side of the negative ring segment to be assembled, and the unthreaded end is inserted into the previous negative ring segment that has been assembled. Steel wire ropes and steel plates are used for reinforcement to ensure the true roundness of the negative ring segment.

[0026] (3) Repeat the above steps (1) and (2) until the last negative ring pipe segment is assembled.

[0027] Among them, the construction method of the socket-and-spigot segment of the mainline tunnel in S4 is as follows:

[0028] (1) Continue to use the transition sequence of "standard block → adjacent block → capping block" at the tunnel entrance. Specifically, on the first ring of the mainline tunnel entrance, the annular seam is connected with a fixed quick connector, where the threaded end is screwed into one end of the first ring of the mainline tunnel segment, and the unthreaded end is inserted into the last ring of the negative ring segment;

[0029] (2) After assembling the first ring of the mainline tunnel entrance, assemble the next ring of the mainline tunnel segments in the order of "standard block → adjacent block → capping block". The annular joints between the mainline tunnel segments are connected with double-ended threaded parts, and the longitudinal joints between the ring mainline segments are connected with CT type slide-in connectors;

[0030] (3) Repeat the above steps (1) and (2) to assemble the mainline tunnel segments until the negative ring segment removal conditions are met, that is, the friction resistance of the outer wall of the mainline tunnel segment is greater than the balanced shield thrust.

[0031] Among them, in S6, the method of lifting and removing the negative ring pipe segment is as follows:

[0032] (1) Removal of the capping block: Use a gantry crane with special lifting tools to drill through the capping block lifting hole, fix the special lifting device, tighten the crane wire rope, and remove the longitudinal seam bolts of the pipe segment; use a manual hoist to slowly pull out the capping block horizontally, and then lift it to the ground;

[0033] (2) Removal of adjacent blocks: After the capping block is removed, continue to use the gantry crane and the special segment lifting tool to fix the first adjacent block of the capping block, tighten the crane wire rope, and use the manual hoist to first constrain the first adjacent block in the horizontal direction, then remove the longitudinal seam bolts of the first adjacent block, loosen the manual hoist, and use the gantry crane to slowly pull out the first adjacent block horizontally, and then lift it to the ground; repeat the removal method of the first adjacent block to remove the second adjacent block of the capping block;

[0034] (3) Standard block removal: Continue to use the gantry crane and lifting tools, adopt the same removal method as the adjacent block segments, and remove the standard block segments symmetrically in turn.

[0035] The beneficial effects of the detachable negative ring pipe segment provided by the present invention, the shield tunnel masonry structure using the negative ring pipe segment, and the construction method thereof are as follows:

[0036] 1) The negative ring pipe segment is produced using the mainline tunnel pipe segment mold. The longitudinal seam connection of the pipe segment is adjusted from CT connector to bolt connector. Only a simple modification of the pipe segment mold is required. The connection form is simple and the production is fast.

[0037] 2) The annular seams of the negative ring pipe sections are connected with quick connectors to solve the problem of easy damage during dismantling of the negative ring pipe sections, achieve lossless dismantling of the negative ring pipe sections, increase the reuse rate of the negative ring pipe sections, save costs, and benefit the low-carbon sustainable development of engineering construction.

[0038] 3) The longitudinal seams of the negative ring pipe joints are connected with bolts, and the circumferential seams are connected with quick connectors. The dismantling method is simple and convenient, which improves the dismantling efficiency of the negative ring pipe joints and reduces the difficulty of the dismantling operation.

[0039] 4) The connecting rod of the negative ring pipe joint is replaced with a conventional threaded screw, which can be used as the connection of the main line tunnel pipe joint, greatly saving project investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A three-dimensional diagram of a negative ring segment of a detachable negative ring segment;

[0041] Figure 2 It is a cross-sectional view of the negative ring segment of the detachable negative ring pipe joint;

[0042] Figure 3 This is a structural diagram of the negative ring segments connected along the annular direction (i.e., longitudinal seam connection);

[0043] Figure 4 It is a structural diagram of the negative ring segments connected along the annular direction and along the axial direction (i.e., annular seam connection);

[0044] Figure 5 This is a structural diagram of the mainline tunnel segments being connected axially by double-ended threaded fittings;

[0045] Figure 6 It is a three-dimensional diagram of a CT type slide-in connector;

[0046] Figure 7 It is a schematic diagram of the cross-section partition of the negative ring pipe section;

[0047] Figure 8 This is a schematic diagram of the status when the negative ring pipe joint is removed.

[0048] Description of reference numerals:

[0049] Negative ring segment 10, quick connector 20, screw connector 30, threaded sleeve 21, connecting rod 22, shaft sleeve 23, connecting groove 11, notch portion 111, perforated portion 112, positive line segment 40, CT-type slide-in connector 60, threaded cap 51, double-ended threaded member 52, middle portion 521, threaded section 522, receiving port 41, C-type connector 61, T-type connector 62, C-type groove 611, port 612, T-type buckle 621, reaction frame 7. DETAILED DESCRIPTION

[0050] The following describes the specific embodiments of the present application in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present application and are not intended to limit the present application.

[0051] like Figures 1 to 4 As shown, an embodiment of the present invention provides a detachable negative ring pipe segment for a socket-type segment shield tunnel, comprising a plurality of negative ring segments 10, a plurality of quick connectors 20 and a plurality of screw connectors 30. The adjacent negative ring segments 10 are connected axially by the quick connectors 20, and the adjacent negative ring segments 10 are connected circumferentially by the screw connectors 30.

[0052] The negative ring segments 10 are made by pouring concrete in a mold. Each quick connector 20 includes a threaded sleeve 21, a connecting rod 22, and a shaft sleeve 23. The threaded sleeve 21 and the shaft sleeve 23 are respectively embedded at both ends of each negative ring segment 10. Specifically, they are embedded at the front and rear ends of each negative ring segment 10 along the axial direction. The connecting rod 22 can be made integrally with the concrete during mold casting to connect the two negative ring segments 10. One end of the connecting rod 22 is screwed to the threaded sleeve 21 of one negative ring segment 10, and the other end is inserted into the shaft sleeve 23 of the other negative ring segment 10. That is, the two ends of the connecting rod 22 are respectively inserted into the threaded sleeve 21 and the shaft sleeve 23, thereby connecting the two negative ring segments 10 along the axial direction (i.e., connecting the ring lines). The connecting rod 22 is connected to the threaded sleeve 21 via a threaded connection. Specifically, the end of the connecting rod 22 that inserts into the threaded sleeve 21 is formed as a threaded end, preferably a tapered threaded end. The connecting rod 22 is connected to the shaft sleeve 23 via a plug-in connection. The end of the connecting rod 22 that inserts into the shaft sleeve 23 is configured as a stepped pin, forming a plug-in end. Correspondingly, the corresponding plug-in hole on the shaft sleeve 23 is a stepped hole to accommodate the connecting rod 22.

[0053] The screw connector 30 is used to connect two adjacent negative ring segments 10 along the ring line. Specifically, after the concrete is poured, a connection groove 11 for installing the screw connector 30 is formed on both sides of each negative ring segment 10. In this embodiment, each connection groove 11 has a notch portion 111 and a perforated portion 112. The notch portion 111 is opened on the inner surface of the negative ring segment 10 and adjacent to the side wall surface, forming a partition wall with the side wall surface of the negative ring segment 10, and the perforated portion 112 passes through the partition wall; when adjacent negative ring segments 10 are connected, the side walls of the two negative ring segments 10 are in contact with each other, and the corresponding The perforated portions 112 are aligned and connected. The bolts of the screw connector 30 are inserted from the notch portion 111 of one negative ring segment 10 and then pass through the two perforated portions 112 to enter the notch portion 111 of another negative ring segment 10. The nuts of the screw connector 30 are then screwed onto the exit ends of the bolts. In this way, the connection of adjacent negative ring segments 10 along the annular direction (i.e., the connection between the longitudinal seams) is achieved. Several negative ring segments 10 are connected end to end to form an annular negative ring segment, and several negative ring segments are connected along the axial direction to form the negative ring segment.

[0054] Furthermore, the present invention provides a shield tunnel masonry structure, including a main line tunnel segment and a detachable negative ring segment, wherein the main line tunnel segment and the negative ring segment are reinforced concrete segments, the main line tunnel segment adopts a socket-type structure, and its annular seam connection adopts a double-ended threaded member 52 (such as Figure 5 As shown), the longitudinal seam connection adopts a CT type slide-in connector 60 (as shown Figure 6 As shown), the longitudinal seam connection of the negative ring pipe segment is connected by a screw connection 30, and the annular seam connection is connected by a quick connector 20.

[0055] The mainline tunnel pipe segment includes a mainline segment 40, a double-end threaded member 52 and a CT-type slide-in connector 60. Adjacent mainline segments 40 are connected axially by the double-end threaded member 52 and connected along the ring line by the CT-type slide-in connector 60.

[0056] The mainline segment 40 is made by pouring concrete in a mold, and its size can be the same as the negative ring segment 10 of the negative ring segment. Therefore, the mainline tunnel segment can use the same set of molds as the negative ring segment to save costs.

[0057] The double-end threaded member 52 includes a threaded cap 51 and a double-end threaded member 52. The threaded cap 51 is embedded in both ends of each main line segment 40. Specifically, it is embedded in the front and rear ends of each main line segment 40 along the axial direction. It can be made integrally with concrete during mold casting. The double-end threaded member 52 includes a middle part 521 and threaded segments 522 formed at both ends of the middle part 521. When adjacent main line segments 40 are axially connected (i.e., annular seam connection), the threaded segments 522 at both ends of the double-end threaded member 52 are respectively screwed into the threaded caps 51 of the two main line segments 40, thereby connecting the adjacent main line segments 40 in the axial direction. It can be understood that in order to facilitate the longitudinal abutment of adjacent main line segments 40, the main line segments 40 are formed with a receiving opening 41, and a threaded cap 51 is correspondingly embedded in the receiving opening 41, so that the middle portion 521 of the double-end threaded member 52 can be received in the receiving opening 41 after being screwed together. When installing the double-end threaded member 52, the threaded segments 522 at both ends of the double-end threaded member 52 are simultaneously inserted into the threaded cap 51 ports of the two adjacent main line segments 40, and then by rotating the middle portion 521, that is, the middle portion 521 rotates around its axis, the threaded segments 522 at both ends will be screwed into the corresponding threaded cap 51, thereby connecting the two main line segments 40 in the axial direction; it can be understood that when it is necessary to separate the two main line segments 40, it is only necessary to apply external force to the middle portion 521 to reverse the middle portion 521.

[0058] The CT-type slide-in connector 60 includes a C-type connector 61 and a T-type connector 62, which are respectively embedded on both sides of each mainline segment 40 and can be made integrally with concrete during mold casting. A C-type groove 611 is formed on the C-type connector 61, and a port 612 for sliding into is provided at one end of the C-type groove 611. The T-type connector 62 has a T-type buckle 621. When adjacent mainline segments 40 are connected in an annular direction (i.e., longitudinal seam connection), the T-type buckle 621 of the T-type connector 62 of one mainline segment 40 slides into the C-type groove 611 of the other mainline segment 40 through the port 612, thereby realizing the annular connection of the two adjacent mainline segments 40.

[0059] When using the mold for producing the main line tunnel pipe segment to cast the negative ring pipe segment, the double-ended threaded parts 52 installed at both ends of the mold to connect the annular seams are replaced with quick connectors 20, and the CT-type slide-in connectors 60 on both sides of the mold are replaced with threaded parts 30, so that the negative ring pipe segment and the main line tunnel pipe segment can be produced using the same set of molds, saving costs.

[0060] For example, in a specific implementation, a number of first toolings are fixedly connected to the side inside the mold, and the first toolings are divided into four groups, all of which are used to clamp the threaded sleeve 21, the shaft sleeve 23 and the screw connector 30. Two groups of first toolings are fixed at both ends of the mold, respectively used to clamp the threaded sleeve 21 and the shaft sleeve 23, and the other two first toolings are fixed on both sides of the mold, both of which are used to clamp the screw connector 30, and the axes of the screw connectors 30 on both sides correspond to each other, so as to avoid the longitudinal staggering of the negative ring pipe sections connected on the side, and ensure that the two end surfaces of the assembled negative ring pipe are flat.

[0061] Furthermore, at least two threaded sleeves 21 and shaft sleeves 23 are installed at both ends of the mold (i.e., at least two threaded sleeves 21 and shaft sleeves 23 are pre-buried at both ends of the negative ring segment 10), and each threaded sleeve 21 corresponds to the center of each shaft sleeve 23. After the production of the negative ring pipe segment is completed, it is necessary to remove the first tooling on both sides of the mold, and then install the second tooling for producing the mainline tunnel pipe segment. The second tooling is used to clamp the CT-type slide-in connector 4, wherein the C-type connector 61 is clamped on the second tooling on one side, and the T-type connector 62 is clamped on the second tooling on the other side. The T-type connector 62 can be slidably inserted into the C-type connector 61 to clamp two adjacent mainline tunnel pipe segments.

[0062] The present invention further provides a construction method for a shield tunnel masonry structure, comprising the following steps:

[0063] S1. Design the molds for the negative ring pipe segment and the main line tunnel pipe segment. The molds are designed to be suitable for two types of pipe segments, CT type slide-in connectors 60 or screw connectors 30, used for longitudinal seam connection through simple modification. That is, the parts of the mold corresponding to the CT type slide-in connectors 60 and screw connectors 30 can be removed and reinstalled; wherein, when the negative ring pipe segment is manufactured, connection grooves 11 for installing the screw connectors 30 are respectively formed on both sides of the mold, a threaded sleeve 21 is placed at one end of the mold, and a shaft sleeve 23 is placed at the other end of the mold; when the main line tunnel pipe segment is manufactured, C-type connectors 61 and T-type connectors 62 are respectively embedded on both sides of the mold, and threaded caps 51 are respectively placed at both ends of the mold.

[0064] S2, using the mold to first produce the negative ring segments 10 of the negative ring segment. After the production of the negative ring segments 10 is completed, the mold is simply modified to replace the longitudinal seam connecting screws 30 with CT-type slide-in connectors 60, and the positive line segments 40 of the positive line tunnel segment are produced.

[0065] S3, the shield starting stage, the negative ring segments 10 are assembled to form negative ring segments, the negative ring segments are axially connected to form negative ring segments, the annular joints between the negative ring segments are connected with quick connectors 20, and the longitudinal joints between the negative ring segments 10 are connected with screw connectors 30. The reaction frame 7 is installed at the end of the negative ring segment facing the mainline tunnel, and the steel wire rope and steel plate are installed along the axial direction to reinforce the negative ring segment;

[0066] (1) Assemble the first ring of negative ring pipe segments in the order of "standard block → adjacent block → capping block", fix them with the reaction frame (7), and reinforce them with steel wire ropes and steel plates to ensure the true roundness of the negative ring pipe segments;

[0067] (2) Continue to assemble the next negative ring segment in the order of "standard block → adjacent block → capping block". The annular seam is connected with a quick connector 20, where the threaded end is screwed into one side of the negative ring segment 10 to be assembled, and the unthreaded end is inserted into the previous negative ring segment 10 that has been assembled. Steel wire ropes and steel plates are used for reinforcement to ensure the true roundness of the negative ring segment;

[0068] (3) Repeat the above steps until the last negative ring pipe segment is assembled;

[0069] S4: The shield tunneling is proceeding normally, and the socket-and-spigot segments of the mainline tunnel are being assembled;

[0070] (1) Continue to use the transition sequence of "standard block → adjacent block → capping block" at the tunnel entrance. Specifically, on the first ring of the mainline tunnel entrance, the annular seam is connected with a fixed quick connector 20, wherein the threaded end is screwed into one end of the first ring of the mainline tunnel segment 40, and the unthreaded end is inserted into the last ring of the negative ring segment;

[0071] (2) After assembling the first ring of the mainline tunnel entrance, assemble the next ring of mainline tunnel segments in the order of "standard block → adjacent block → capping block". The annular joints between the mainline tunnel segments are connected by double-ended threaded parts 52, and the longitudinal joints between the ring mainline segments 40 are connected by CT-type slide-in connectors 60;

[0072] (3) Repeat the above steps to assemble the mainline tunnel segments until the negative ring segment removal condition is met, that is, the friction resistance of the outer wall of the mainline tunnel segment is greater than the balanced shield thrust;

[0073] S5: When the conditions for dismantling the negative ring pipe joint are met, remove the reaction frame, remove the steel wire ropes reinforcing the negative ring pipe joint and the connecting steel plates between the negative rings, and remove the air ducts, rails, and circulating water pipes within the negative ring range. Protect the high-voltage cables.

[0074] S6, dismantle the negative ring pipe segment. The dismantling order is: dismantle the entire segment from the reaction frame toward the main line tunnel. The dismantling order of the single ring segment is from top to bottom.

[0075] The following further illustrates the installation and disassembly methods of the negative ring pipe joint.

[0076] The installation method of the negative ring pipe joint is as follows:

[0077] In this embodiment, nine negative ring segments are connected at their sides and spliced ​​along the ring line to form a complete negative ring segment. Figure 7 and Figure 8 As shown in the figure, the nine negative ring segments are numbered in the order of installation: A4, A3, A5, A2, A6, A1, L2, L1, K; A represents the standard block, L represents the adjacent block, and K represents the capping block.

[0078] Before assembling the nine negative ring segments, it is necessary to first install the reaction frame 7 to provide an installation foundation for the negative ring pipe section. Then, each negative ring segment is installed on the reaction frame 7 in sequence according to the above-mentioned installation sequence. Specifically, the nine negative ring segments are provided with one end of the threaded sleeve 21 that abuts against the reaction frame 7 to form the front end face of the negative ring tube, and the nine negative ring segments are provided with one end of the shaft sleeve 23 that is away from the reaction frame 7 and is located in the same plane to form the rear end face of the negative ring tube. And the two adjacent negative ring segments of the same negative ring tube are fixed to each other by bolts. The sides of the two adjacent negative ring segments abut against each other and are locked by the screw connector 30 to fix the two adjacent negative ring segments to each other.

[0079] Furthermore, the inner ring surface of each negative ring tube is provided with a steel wire rope and a steel plate (not shown in the figure), which is located between two adjacent negative ring segments to increase the stability between the negative ring segments and ensure the true roundness of the negative ring tube.

[0080] When assembling the second negative ring pipe, first install the threaded end of the connecting rod 22 on the end of the negative ring pipe segment numbered A4 with the threaded sleeve 21. After ensuring that the connecting rod 22 is completely tightened in the threaded sleeve 21, the negative ring pipe segment is hoisted close to the rear end face of the first negative ring pipe and corresponds to the negative ring pipe segment numbered A4, so that the pin end of the connecting rod 22 is inserted into the shaft sleeve 23 on the rear end face of the first negative ring pipe, and the negative ring pipe segment of the second negative ring pipe is fixed to the first negative ring pipe. Then, assemble the second negative ring pipe according to the installation order of the first negative ring pipe and the above connection method. Repeat this process to connect multiple negative ring pipes axially to form a negative ring pipe section of a certain length.

[0081] In this embodiment, the longitudinal seams of two adjacent negative ring tubes are preferably staggered. For example, the negative ring segment numbered A4 in the second negative ring tube is connected to the negative ring segments numbered A4 and A3 in the first negative ring tube (i.e., each negative ring segment of the second negative ring tube corresponds to a longitudinal seam in the first negative ring tube). This improves the compressive strength of the tunnel formed by connecting several negative ring tubes.

[0082] The disassembly method of the negative ring pipe joint is as follows:

[0083] The shield machine excavates normally, and the main line tunnel segments are assembled at the same time. After excavating a preset distance, the friction resistance of the outer wall of the main line tunnel segment is greater than the balanced shield thrust, and the entire negative ring segment can be removed.

[0084] Before removing the negative ring pipe segment, it is necessary to first remove the reaction frame 7 and separate the reaction frame 7 from the first negative ring pipe. Then, remove the wire rope and steel plate that connect and fix the two adjacent negative ring pipe segments in the negative ring pipe, so that the bolts between the two adjacent negative ring pipe segments can be further removed.

[0085] In this embodiment, when removing a single negative ring pipe, it is necessary to remove each negative ring segment in the reverse order of installation, that is, first remove the capping block numbered K. The specific steps are as follows:

[0086] First, use a gantry crane or a crane to load special lifting tools, fix the top capping block numbered K, then tighten the crane wire rope, and then remove the bolts connecting the two sides of the capping block to the adjacent blocks numbered L1 and L2, so that the screw connectors 30 on both sides of the capping block numbered K are released from the screw connectors 30 on the sides of the numbers L1 and L2, making it convenient for the crane to drive the capping block to move horizontally, and then drive the shaft sleeve 23 at the end of the capping block to disengage from the connecting rod 22 screwed on the second negative ring tube, and finally lift the capping block to the bottom surface.

[0087] Then, remove the first adjacent block numbered L1. First, continue to use the gantry crane or crane to drive the special lifting tool to fix the first adjacent block, then tighten the crane wire rope, and use the manual hoist to first constrain the horizontal direction of the first adjacent block to prevent the first adjacent block from shaking excessively during removal, causing damage to the connecting rod 22. Then remove the bolts connecting the first adjacent block and the adjacent second adjacent block, release the fixation of the screw 30 between the two adjacent blocks, and then relax the manual hoist to stabilize the first adjacent block. Finally, use the crane to slowly pull the first adjacent block out horizontally and then lift it to the ground.

[0088] Finally, according to the above steps, the second adjacent block numbered L2 and the standard blocks numbered A1, A6, A2, A5, A3, and A4 are removed in sequence, and this process is repeated until all the negative ring segments that need to be removed are removed.

[0089] The shield tunnel masonry structure has the following beneficial effects during construction:

[0090] 1) The negative ring segments and the mainline tunnel segments are produced using the same segment mold. Through simple modification, the segment mold can simultaneously meet the production requirements of segments with bolt connections and CT connectors for longitudinal joints.

[0091] 2) When producing the pipe segments, first complete the production of the negative ring pipe segment, and then simply modify the pipe segment mold to produce the socket-type pipe segments for the mainline tunnel.

[0092] 3) A longitudinal steel plate can be further embedded in the negative ring segment to strengthen the longitudinal connection between the segments (i.e., the axial tension of the segments) and improve the roundness of the negative ring segment.

[0093] 4) When assembling the negative ring pipe segment, screw the threaded section of the quick connector into the embedded nut of the pipe segment to be assembled, and press the unthreaded section into the embedded nut of the assembled pipe segment. At the same time, tighten the longitudinal seam bolts of the pipe segment. Complete the assembly of the entire ring of pipe segments in the order of standard block → adjacent block → capping block, and perform temporary steel plate welding.

[0094] 5) When dismantling the negative ring pipe segment, first cut and remove the temporary steel plate, then remove the longitudinal seam bolt connection of the pipe segment, and complete the dismantling of the pipe segment in the order of capping block → adjacent block → standard block.

[0095] 6) The special screw customized for the negative ring pipe segment is replaced with a conventional threaded screw, which can be used as a mainline tunnel pipe segment. This pipe segment structure can be widely used in mainline tunnels.

[0096] 7) The annular seam of the negative ring pipe segment adopts a single-side non-threaded rod body instead of the screw of the threaded quick connector, which solves the problem of destructive dismantling of the pipe segment using the threaded quick connector, realizes the non-destructive dismantling of the negative ring pipe segment, improves the reuse rate of the negative ring pipe segment, saves costs, and is conducive to the low-carbon and sustainable development of engineering construction.

[0097] 8) The longitudinal seams of the negative ring pipe joints are connected by bolts, and the annular seams use quick connectors with single-side non-threaded rods. The disassembly method is simple and convenient, and no special design is required.

[0098] It can be understood that the use of quick connectors with single-sided non-threaded rods in the annular seam connection of the negative ring pipe segment is for easy disassembly, while the use of double-ended threaded parts in the annular seam connection of the main line tunnel pipe segment can ensure connection stability, facilitate installation, and facilitate mechanized automatic assembly, thereby improving splicing efficiency.

[0099] The above-described embodiments merely illustrate the implementation methods of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A detachable negative ring segment for a socket-and-spigot segment shield tunnel, comprising a negative ring segment (10), a quick connector (20), and a screw connector (30), wherein adjacent negative ring segments (10) are connected axially by the quick connector (20), and adjacent negative ring segments (10) are connected circumferentially by the screw connector (30), characterized in that: The quick connector (20) comprises a threaded sleeve (21), a connecting rod (22) and a shaft sleeve (23). The threaded sleeve (21) and the shaft sleeve (23) are respectively pre-buried at both ends of each negative ring segment (10). The connecting rod (22) connects the two negative ring segments (10). One end of the connecting rod (22) is screwed onto the threaded sleeve (21) of one negative ring segment (10), and the other end is plugged into the shaft sleeve (23) of the other negative ring segment (10).

2. The detachable negative ring pipe joint according to claim 1, characterized in that: One end of the connecting rod (22) threadedly connected to the threaded sleeve (21) has an external thread to form a threaded end, and the other end is configured as a stepped pin shaft to form a plug end.

3. The detachable negative ring pipe joint according to claim 1, characterized in that: Connecting grooves (11) for installing screw connectors (30) are respectively formed on both sides of each negative ring segment (10). Each connecting groove (11) has a notch portion (111) and a perforated portion (112). The notch portion (111) is provided on the inner surface of the negative ring segment (10) and adjacent to the side wall surface, forming a partition wall with the side wall surface of the negative ring segment (10). The perforated portion (112) penetrates the partition wall. The side walls of the two negative ring segments (10) are fitted together, and the corresponding perforated portions (112) on the side walls are aligned and communicated. The bolts of the screw connector (30) are inserted from the notch portion (111) of one negative ring segment (10) and pass through the two perforated portions (112) to enter the notch portion (111) of the other negative ring segment (10). The nuts of the screw connector (30) are screwed to the protruding ends of the bolts.

4. A shield tunnel masonry structure, characterized by: The invention comprises a mainline tunnel pipe segment and a detachable negative ring pipe segment as described in any one of claims 1 to 3 installed at the front end of the mainline tunnel pipe segment. The mainline tunnel pipe segment comprises a mainline pipe segment (40), a double-end threaded member (52) and a CT-type slide-in connector (60). Adjacent mainline pipe segments (40) are connected axially by the double-end threaded member (52) and are connected circumferentially by the CT-type slide-in connector (60).

5. The shield tunnel masonry structure according to claim 4, characterized in that: The positive line segment (40) and the negative ring segment (10) have the same shape and size and are manufactured by pouring concrete using the same set of molds. During the manufacturing process, the positive line segment (40) is manufactured by inserting threaded caps (51) at both ends of the mold for embedding, and inserting C-shaped connectors (61) and T-shaped connectors (62) at both sides of the mold. During the manufacturing process, the negative ring segment (10) is manufactured by inserting a threaded sleeve (21) at one end of the mold and an axle sleeve (23) at the other end of the mold, and forming connection grooves (11) on both sides of the mold for installing screw connectors (30).

6. The shield tunnel masonry structure according to claim 4, characterized in that: The double-end threaded member (52) includes a threaded cap (51) and a double-end threaded member (52). The threaded cap (51) is embedded at both ends of each main line segment (40). The double-end threaded member (52) includes a middle portion (521) and threaded segments (522) formed at both ends of the middle portion (521). By screwing the threaded segments (522) at both ends of the double-end threaded member (52) into the threaded caps (51) of the two main line segments (40), the adjacent main line segments (40) are connected in the axial direction.

7. The shield tunnel masonry structure according to claim 4, characterized in that: The CT type sliding connector (60) comprises a C-type connector (61) and a T-type connector (62), which are respectively embedded on both sides of each main line segment (40). A C-type groove (611) is formed on the C-type connector (61), and a port (612) for sliding into is provided at one end of the C-type groove (611). The T-type connector (62) has a T-type buckle (621). The T-type buckle (621) of the T-type connector (62) of one main line segment (40) slides into the C-type groove (611) of another main line segment (40) through the port (612), thereby connecting the two adjacent main line segments (40) in a circumferential direction.

8. A construction method of a shield tunnel masonry structure according to any one of claims 4 to 7, characterized in that: The implementation steps include: S1, designing molds for the negative ring pipe segment and the positive line tunnel pipe segment so that the longitudinal seam connection between the negative ring pipe segment and the positive line tunnel pipe segment is suitable for replacement using a CT-type slide-in connector (60) or a screw connector (30), wherein when the negative ring pipe segment is manufactured, connection grooves (11) for mounting the screw connector (30) are respectively formed on both sides of the mold, and when the positive line tunnel pipe segment is manufactured, a C-type connector (61) and a T-type connector (62) are respectively embedded on both sides of the mold; S2, using a mold to first produce a negative ring segment (10) of a negative ring segment; after the negative ring segment (10) is produced, the mold is modified, and the screw connection piece (30) of the longitudinal seam connection is adjusted to a CT type slide-in connection piece (60) to produce the positive line segment (40) of the positive line tunnel segment; S3, shield starting stage, negative ring segments (10) are assembled to form negative ring segments, the negative ring segments are axially connected to form negative ring segments, the annular joints between the negative ring segments are connected by quick connectors (20), the longitudinal joints between the negative ring segments (10) are connected by screw connectors (30), a reaction frame (7) is installed at one end of the negative ring segment opposite to the main line tunnel, and steel wire ropes and steel plates are installed along the axial direction to reinforce the negative ring segment; S4: The shield tunneling is carried out normally, and the mainline tunnel segments are assembled; S5, when the conditions for dismantling the negative ring pipe segment are met, the reaction frame (7) is dismantled, and the steel wire ropes reinforcing the negative ring pipe segment and the connecting steel plates between the negative ring pipe segments are dismantled; S6, dismantle the negative ring pipe segment. The dismantling order is: dismantle the entire segment from the direction close to the reaction frame (7) toward the main line tunnel. The dismantling order of the single ring segment is from top to bottom.

9. The construction method of shield tunnel masonry structure according to claim 8, characterized in that: In S3, the construction method of the negative ring pipe joint is as follows: (1) Assemble the first ring of negative ring pipe segments in the order of "standard block → adjacent block → capping block", fix them with the reaction frame, and reinforce them with steel wire ropes and steel plates to ensure the true roundness of the negative ring pipe segments; (2) Continue to assemble the next negative ring segment in the order of "standard block → adjacent block → capping block". The annular seam is connected by a quick connector, wherein the threaded end is screwed into one side of the negative ring segment (10) to be assembled, and the unthreaded end is inserted into the previous negative ring segment (10) that has been assembled. Steel wire ropes and steel plates are used for reinforcement to ensure the true roundness of the negative ring segment; (3) Repeat the above steps (1) and (2) until the last negative ring pipe segment is assembled.

10. The construction method of shield tunnel masonry structure according to claim 8, characterized in that: In S6, the method for lifting and removing the negative ring pipe segment is as follows: (1) Removal of the capping block: Use a gantry crane with special lifting tools to drill through the capping block lifting hole, fix the special lifting device, tighten the crane wire rope, and remove the longitudinal seam bolts of the pipe segment; use a manual hoist to slowly pull out the capping block horizontally, and then lift it to the ground; (2) Removal of adjacent blocks: After the capping block is removed, continue to use the gantry crane and the special segment lifting tool to fix the first adjacent block of the capping block, tighten the crane wire rope, and use the manual hoist to first constrain the first adjacent block in the horizontal direction, then remove the longitudinal seam bolts of the first adjacent block, loosen the manual hoist, and use the gantry crane to slowly pull out the first adjacent block horizontally, and then lift it to the ground; repeat the removal method of the first adjacent block to remove the second adjacent block of the capping block; (3) Standard block removal: Continue to use the gantry crane and lifting tools, adopt the same removal method as the adjacent block segments, and remove the standard block segments symmetrically in turn.

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