A bolt type shield tunnel inter-ring joint self-damage anti-seismic mechanism

Abstract

The utility model discloses a bolt formula's shield tunnel ring indirect joint self -loss anti -seismic mechanism, including cutting part and trigger part, cutting part includes high -strength cutting knife, first elastic reset piece and fixed part, and trigger part includes second elastic reset piece and bolt piece. The first tube piece is provided with transverse accommodation cavity to the ring bolt intercommunication, and the high -strength cutting knife sets up in transverse accommodation cavity, and the cutting edge is towards the ring bolt, and the knife tail is connected to the fixed part through the first elastic reset piece to be fixed on the first tube piece, and the high -strength cutting knife is provided with the insertion hole along the lateral. The first tube piece is provided with longitudinal accommodation cavity to the transverse accommodation cavity intercommunication from the joint surface, and the bolt piece and second elastic reset piece set up in longitudinal accommodation cavity, and the bolt piece one end is inserted in the insertion hole, makes the first elastic reset piece compression, and the other end is under the resilience of second elastic reset piece and is butt joint on the second tube piece surface. The anti -seismic structure cuts off the ring bolt to protect shield tube piece when the tensile force is over limit, and has improved tunnel overall bearing capacity.

Description

Technical Field

[0001] This utility model relates to the field of tunnel engineering construction technology, and in particular to a pin-type self-damaging seismic-resistant mechanism for shield tunnel ring joints. Background Technology

[0002] From a structural perspective, shield tunnels are assembled into segment rings by connecting segments and bolts, and then connected as a whole by inter-ring bolts. The "segment-bolt" connection between segment rings is commonly referred to as an inter-ring joint. Under cyclic seismic loads, these inter-ring joints undergo cyclic tensile-compressive deformation. A large opening in the inter-ring joint indicates a high tensile force, while the tensile strength of concrete is significantly lower than its compressive strength. In this situation, the segments are highly susceptible to strength failure, leading to the failure of the tunnel structure's load-bearing system. Therefore, it is crucial to coordinate the deformation of the segments and inter-ring bolts at the inter-ring joints, cutting off the transmission path of external forces when necessary to prevent premature segment failure and loss of compressive load-bearing capacity contribution to the tunnel structure.

[0003] Especially when large-diameter tunnel segments are used in urban shield tunnels, the matching large-diameter inter-ring bolts exacerbate the uncoordinated deformation between the two. Therefore, it is urgent to establish effective structural protection to achieve coordinated deformation control of tunnel segments and connecting bolts under earthquakes or strong impacts, thereby improving the structural safety of underground lifeline projects. Utility Model Content

[0004] The main technical problem to be solved by this utility model is to provide an anti-seismic mechanism for the joint of shield tunnel segments, which protects the shield segments when the tensile force of the joint exceeds the limit, so as to maximize the load-bearing contribution of the shield segments to the tunnel structure.

[0005] To address the aforementioned technical problems, this utility model provides a pin-type self-damaging seismic-resistant mechanism for shield tunnel interlocking rings. The interlocking ring includes interlocking bolts and a first segment and a second segment longitudinally connected via the interlocking bolts.

[0006] The seismic-resistant mechanism includes a cutting section and a triggering section; the cutting section includes a high-strength cutting blade, a first elastic reset component, and a fixing component; the triggering section includes a second elastic reset component and a pin component;

[0007] The first tube segment has a transverse accommodating cavity that connects to the inter-ring bolt from its side surface; the high-strength cutting blade is disposed in the transverse accommodating cavity with its blade facing the inter-ring bolt, and its tail is connected to the fixing member through the first elastic reset member; the fixing member is connected to the first tube segment; the high-strength cutting blade has an insertion hole along its side;

[0008] The first tube segment is provided with a longitudinal receiving cavity communicating with the transverse receiving cavity from the joint surface with the second tube segment; the pin and the second elastic reset member are arranged axially in the longitudinal receiving cavity; one end of the pin is inserted into the insertion hole of the high-strength cutting blade so that the first elastic reset member is in a compressed state, and the other end abuts against the surface of the second tube segment under the restoring force of the second elastic reset member;

[0009] The opening facing the longitudinal accommodating cavity is the first opening; the pin includes a pin shaft, and the distance from the end of the pin shaft to the first opening matches the opening limit of the ring joint.

[0010] In a preferred embodiment, the transverse receiving cavity is perpendicular to the interring bolt.

[0011] In a preferred embodiment, the longitudinal accommodating cavity is perpendicular to the joint surface between the first and second segments.

[0012] In a preferred embodiment, the natural length of the second resilient reset member is greater than the length of the pin member.

[0013] In a preferred embodiment, the longitudinal receiving cavity is connected to the transverse receiving cavity through a guide channel; the pin is inserted into the socket after passing through the guide channel.

[0014] In a preferred embodiment, the pin is a T-shaped pin, which also includes a limiting part; one end of the pin is inserted into the insertion hole, and the other end is fixedly connected to the limiting part; the limiting part abuts against the surface of the second tube segment under the restoring force of the second elastic reset member.

[0015] In a preferred embodiment, the limiting portion is fixedly connected to the second elastic reset member.

[0016] In a preferred embodiment, the first elastic reset member and / or the second elastic reset member are springs.

[0017] In a preferred embodiment, the fastener is a fixing plate.

[0018] In a preferred embodiment, the fixing plate is detachably mounted on the first segment by a plurality of threaded fasteners.

[0019] Compared with the prior art, the technical solution of this utility model has the following beneficial effects:

[0020] The seismic-resistant mechanism provided by this invention dynamically senses the opening of the interlocking joints via mechanical connections, thereby accurately and promptly ejecting a high-strength cutting blade according to safety limits. Thanks to this, the interlocking joints can promptly cut off the tension transmission medium, the interlocking bolts, when subjected to significant stress, preventing the shield tunnel segments from prematurely exiting the load-bearing system due to tensile failure, thus improving the overall load-bearing capacity of the shield tunnel. Secondly, the seismic-resistant mechanism is systematically assembled inside the shield tunnel segments, avoiding accidental triggering due to external interference under normal conditions; the reliable connection between the cutting and triggering parts and the reasonable and clear limiting method ensure accurate and stable triggering in emergency situations. Furthermore, the seismic-resistant mechanism only needs to be installed synchronously during the longitudinal assembly stage of the shield tunnel segments, which is convenient and quick, and highly compatible with conventional shield tunneling operations. Attached Figure Description

[0021] Figure 1 This is a schematic diagram showing the installation position of the earthquake-resistant mechanism described in this embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the earthquake-resistant mechanism under normal conditions as described in the embodiments of this utility model;

[0023] Figure 3 This is a schematic diagram of the earthquake-resistant mechanism being triggered in an embodiment of this utility model.

[0024] The markings in the diagram are as follows: 1-Anti-seismic mechanism, 11-High-strength cutting blade, 111-Insertion hole, 12-First spring, 13-Fixing plate, 14-Threaded fastener, 15-Second spring, 16-T-pin, 161-Pin, 162-End plate, 2-First tube segment, 21-Transverse accommodating cavity, 22-Longitudinal accommodating cavity, 221-Guide channel, 3-Second tube segment, 4-Hand hole, 5-Interring bolt, 6-Washer. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0026] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," 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 utility model 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 utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped with", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0028] like Figures 1-3 As shown, this utility model embodiment provides a pin-type shield tunnel ring joint self-damaging seismic-resistant mechanism 1, including a cutting part and a triggering part connected by a pin. Specifically, the cutting part includes a high-strength cutting blade 11, a first elastic reset member, and a fixing member; the triggering part includes a second elastic reset member and a pin member. In this embodiment, the first elastic reset member and the second elastic reset member are springs, respectively referred to as the first spring 12 and the second spring 15; the fixing member is a plate, referred to as the fixing plate 13.

[0029] like Figure 1 As shown, two adjacent shield tunnel segments are connected longitudinally at the joint by a set of inter-ring bolts 5. The longitudinal direction is parallel to the extension direction of the shield tunnel. Specifically, each of the two adjacent shield tunnel segments has a handhole 4 on both sides of the joint surface. A bolt hole is longitudinally positioned between the two spaced-apart handholes 4, perpendicular to the joint surface. The inter-ring bolts 5 pass through the bolt holes and are threaded at both ends to press against the inner wall of the handhole 4, thereby achieving the longitudinal connection of the shield tunnel segments. Preferably, a washer 6 is provided between the bolt head of the inter-ring bolt 5 and the inner wall of the handhole 4.

[0030] The seismic-resistant mechanism 1 is installed inside the shield tunnel segment on either side. When the inter-ring joints experience excessive longitudinal opening due to earthquake action, the seismic-resistant mechanism 1 triggers a high-strength cutting blade 11 to cut the inter-ring bolts 5, thereby cutting off the tensile force transmission path and protecting the shield tunnel segment with lower tensile bearing capacity. For ease of description below, two adjacent shield tunnel segments are referred to as the first segment 2 and the second segment 3, respectively. Specifically, as... Figure 2 As shown, the first segment 2 has an internal accommodating space, including a transverse accommodating cavity 21 and a longitudinal accommodating cavity 22 that are interconnected. The transverse accommodating cavity 21 is perpendicular to the inter-ring bolt 5, with its inner side connected to the bolt hole and its outer side extending to the outer surface of the first segment 2. The high-strength cutting blade 11 is coaxially disposed in the transverse accommodating cavity 21, with its cutting edge facing the inter-ring bolt 5, and its tail connected to the fixing plate 13 via the first spring 12. The high-strength cutting blade 11 has a radially penetrating insertion hole 111. The first spring 12 is axially disposed along the transverse accommodating cavity 21 to eject the high-strength cutting blade 11 in a direction perpendicular to the inter-ring bolt 5 after compression and energy storage. The assembly length of the first spring 12, i.e., the pre-compressed length, is much smaller than its natural length to provide sufficient impulse for the high-strength cutting blade 11. The fixing plate 13 is detachably mounted on the outer surface of the first segment 2 using several threaded fasteners 14 to provide a reaction force support for the first spring 12.

[0031] like Figure 2 As shown, the longitudinal accommodating cavity 22 has a stepped overall structure, which is vertically recessed along the joint surface of the first tube segment 2 and the second tube segment 3, and communicates with the transverse accommodating cavity 21 through a guide channel 221. The pin and the second spring 15 are axially disposed within the longitudinal accommodating cavity 22. In this embodiment, the pin is a T-shaped pin 16, including a pin shaft 161 and a limiting part. The pin shaft 161 is coaxially inserted into the second spring 15, and after passing through the guide channel 221, it is vertically inserted into the insertion hole 111 of the high-strength cutting blade 11, so that the first elastic reset member is in a compressed state. In this embodiment, the limiting part is an end plate 162, which is vertically fixed to the end of the pin shaft 161 away from the insertion hole 111. The maximum transverse dimension of the end plate 162 is greater than the inner diameter of the second elastic reset member, so that under the restoring force of the second spring 15, it abuts against the surface of the second tube segment 3 in a direction away from the high-strength cutting blade 11. Preferably, in this embodiment, the end plate 162 is fixedly connected to the second spring 15. Preferably, the natural length of the second spring 15 is greater than the length of the insertion rod, so that it can drive the insertion rod to completely disengage from the insertion hole 111 before returning to its natural state.

[0032] like Figure 3As shown, when the interlocking joint is subjected to an earthquake, the second segment 3 detaches from the first segment 2, causing the end plate 162 abutting against the surface of the second segment 3 to drive the pin 161 to move away from the high-strength cutting blade 11. When the opening amount of the interlocking joint, i.e., the longitudinal displacement of the second segment 3 relative to the first segment 2, exceeds the limit, the pin 161 completely exits the insertion hole 111 under the action of the second spring 15, and the limiting cooperation with the high-strength cutting blade 11 fails. At this time, the high-strength cutting blade 11 springs towards the interlocking bolt 5 under the extremely high elastic potential energy of the first spring 12, thereby cutting the interlocking bolt 5. The interlocking bolt 5 rapidly develops cracks under the action of external force until it breaks, realizing the self-protection of the shield segment. The opening of the insertion hole 111 facing the longitudinal accommodating cavity 22 is now referred to as the first opening. Therefore, during assembly, the distance from the end of the pin 161 to the first opening should match the set opening amount limit.

[0033] To facilitate a better understanding of this technical solution, the installation and operation process of the earthquake-resistant structure are briefly described below. This process includes the following steps:

[0034] (1) Drill the transverse accommodating cavity 21 and the longitudinal accommodating cavity 22 in the first segment 2.

[0035] (2) Secure the high-strength cutting blade 11, the first spring 12, and the fixing plate 13 together in pairs. Then, extend the high-strength cutting blade 11 into the longitudinal receiving cavity 22. Secure the second spring 15 to the end plate 162 of the T-shaped pin 16 and then place it into the longitudinal receiving cavity 22. The end of the pin 161 should at least enter the guide channel 221.

[0036] (3) Insert the inter-ring bolt 5 into the bolt hole, and place the washer 6 and nut at the end of the inter-ring bolt 5. Assemble the first tube segment 2 and the second tube segment 3 in the conventional manner. It should be noted that during the tightening of the inter-ring bolt 5, the second tube segment 3 continuously presses the end plate 162 inward, which drives the end of the pin 161 to abut against the high-strength cutting blade 11 from the side. Therefore, it is necessary to adjust the depth and angle of the high-strength cutting blade 11 in time so that the pin 161 enters the insertion hole 111 to avoid the high-strength cutting blade 11 being damaged by lateral punching.

[0037] (4) The fixing plate 13 is installed on the outer surface of the first tube segment 2 using several threaded fasteners 14 to compress the first spring 12. The installation process of the anti-vibration mechanism 1 is completed.

[0038] (5) When encountering an earthquake or strong impact, if the opening of the inter-ring bolt exceeds the limit, the T-pin 16 will exit the socket 111, and the high-strength cutting blade 11 will eject and cut the inter-ring bolt 5 laterally. The inter-ring bolt 5 will develop cracks under the action of external force until it breaks.

[0039] (6) After the damage occurs, replace the damaged inter-ring bolt 5 and reset the seismic mechanism 1, and reassemble the shield tunnel segments.

[0040] In summary, the seismic-resistant mechanism 1 provided in this embodiment of the invention dynamically senses the opening amount of the interlocking joints through mechanical connection, thereby accurately ejecting the high-strength cutting blade 11 in a timely manner according to safety limits. Thanks to this, the interlocking joints can promptly cut off the tension transmission medium, the interlocking bolts 5, when subjected to significant force, preventing the shield tunnel segments from prematurely exiting the load-bearing system due to tensile failure, thus improving the overall load-bearing capacity of the shield tunnel. Secondly, the seismic-resistant mechanism 1 is systematically assembled inside the shield tunnel segments, avoiding accidental triggering due to external interference under normal conditions; the reliable connection between the cutting part and the triggering part, and the reasonable and clear limiting method, ensure accurate and stable triggering in emergency situations. Furthermore, the seismic-resistant mechanism 1 only needs to be installed synchronously during the longitudinal assembly stage of the shield tunnel segments, which is convenient and quick, and highly compatible with conventional shield tunneling operations.

[0041] For those skilled in the art, although the above embodiments can well illustrate the technical solution of this utility model, various changes and improvements can still be made to the structure, parameters and construction methods of each component without departing from the basic idea of ​​this utility model, and all of these should be considered within the protection scope of this utility model.

Claims

1. A pin-type self-damaging seismic-resistant mechanism for shield tunnel ring joints, characterized in that: The inter-ring joint includes an inter-ring bolt and a first tube segment and a second tube segment that are longitudinally connected by the inter-ring bolt; The seismic-resistant mechanism includes a cutting section and a triggering section; the cutting section includes a high-strength cutting blade, a first elastic reset component, and a fixing component; the triggering section includes a second elastic reset component and a pin component. The first tube segment has a transverse accommodating cavity that connects to the inter-ring bolt from its side surface; the high-strength cutting blade is disposed in the transverse accommodating cavity with its blade facing the inter-ring bolt, and its tail is connected to the fixing member through the first elastic reset member; the fixing member is connected to the first tube segment; the high-strength cutting blade has an insertion hole along its side; The first tube segment is provided with a longitudinal receiving cavity communicating with the transverse receiving cavity from the joint surface with the second tube segment; the pin and the second elastic reset member are axially disposed in the longitudinal receiving cavity; one end of the pin is inserted into the insertion hole of the high-strength cutting blade so that the first elastic reset member is in a compressed state, and the other end abuts against the surface of the second tube segment under the restoring force of the second elastic reset member; The opening facing the longitudinal accommodating cavity is the first opening; the pin includes a pin shaft, and the distance from the end of the pin shaft to the first opening matches the opening limit of the ring joint.

2. The self-damaging seismic-resistant mechanism for shield tunnel ring joints according to claim 1, characterized in that: The transverse accommodating cavity is perpendicular to the inter-ring bolt.

3. A pin-type self-damaging seismic-resistant mechanism for shield tunnel ring joints according to any one of claims 1 or 2, characterized in that: The longitudinal accommodating cavity is perpendicular to the joint surface between the first and second segments.

4. The self-damaging seismic-resistant mechanism for shield tunnel ring joints according to claim 1, characterized in that: The natural length of the second elastic reset member is greater than the length of the pin member.

5. A pin-type self-damaging seismic-resistant mechanism for shield tunnel ring joints according to claim 1, characterized in that: The longitudinal accommodating cavity is connected to the transverse accommodating cavity through a guide channel; the pin is inserted into the socket after passing through the guide channel.

6. The self-damaging seismic-resistant mechanism for shield tunnel ring joints according to claim 1, characterized in that: The pin is a T-shaped pin, which also includes a limiting part; one end of the pin is inserted into the insertion hole, and the other end is fixedly connected to the limiting part; the limiting part abuts against the surface of the second tube segment under the restoring force of the second elastic reset member.

7. A pin-type self-damaging seismic-resistant mechanism for shield tunnel ring joints according to claim 6, characterized in that: The limiting part is fixedly connected to the second elastic reset member.

8. A pin-type self-damaging seismic-resistant mechanism for shield tunnel ring joints according to claim 1, characterized in that: The first elastic reset member and / or the second elastic reset member are springs.

9. A pin-type self-damaging seismic-resistant mechanism for shield tunnel ring joints according to claim 1, characterized in that: The fastener is a fixing plate.

10. A pin-type self-damaging seismic-resistant mechanism for shield tunnel ring joints according to claim 9, characterized in that: The fixing plate is detachably mounted on the first segment by a number of threaded fasteners.

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