Novel self-locking type combined connecting piece for shield tunnel circular seam and mounting method of novel self-locking type combined connecting piece

Abstract

The invention discloses a novel self-locking type combined connecting piece for a shield tunnel circular seam and a mounting method, and belongs to the technical field of shield tunnel lining structures. The novel self-locking type combined connecting piece comprises a male plug and two female plugs which are arranged at the two ends of the male plug and used for being fixedly arranged in two adjacent pipe pieces respectively. When the bolt is used, the inverted-truncated-cone-shaped part of the bolt body is used for pushing the four-block cushion block to retreat, the inverted-truncated-cone-shaped part is inserted into the elastic truncated-cone-shaped part of the four-block cushion block, and then the spring is used for pushing the inverted-truncated-cone-shaped part to retreat; and the inner wall of the circular truncated cone hole of the pre-embedded sleeve forces the inner diameter of the opening side of the elastic circular truncated cone part of the four-block cushion block to be reduced, so that the inverted circular truncated cone-shaped part is locked in the elastic circular truncated cone part of the four-block cushion block. Compared with the prior art, the steel-plastic composite board has the beneficial effects that the steel-plastic composite board has tensile and shear-resistant capacities at the same time, and can be quickly assembled.

Description

Technical Field

[0001] The invention belongs to the technical field of shield tunnel lining structures, and in particular relates to a novel self-locking combined connector for annular seams of shield tunnels and an installation method. Background Art

[0002] With the construction of national infrastructure, shield tunnels are increasingly used in the construction of urban underground space projects. The main problems of shield tunnels during operation, such as segment misalignment, opening and water leakage, have not yet been completely solved. During operation, the shield tunnels leak at the annular joints mainly because the insufficient connection stiffness of the annular joints leads to excessive misalignment between rings and annular joint opening. The existing connection methods between segments are mainly "bolts + shear pins" or "bolts + convex and concave tenons". Shear pins and convex and concave tenons connect the front and rear ring segments, which mainly play the role of shear resistance and reducing the amount of misalignment between rings, but do not have the ability to resist tension. Traditional bolt assembly is time-consuming and labor-intensive, and the presence of bolt holes will also provide leakage channels for groundwater, exacerbating the water leakage problem.

[0003] After searching the existing literature, Chinese patent application CN117536642A discloses a shield tunnel segment annular seam inserted into a self-locking quick connector to make the segment annular seam joint have tensile strength, but the shear resistance of this connector is poor, and under the action of external loads, the segment joint is locally damaged due to stress concentration, providing a leakage channel for groundwater, thereby aggravating the hazard of water leakage.

[0004] In summary, there is an urgent need to develop a new type of quick connector that has both tensile and shear resistance, and has the connection functions of "bolts" and "shear pins or tenons" in traditional connection methods, while eliminating leakage channels and reducing the phenomenon of segment breakage caused by local force concentration at the segment joints. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a new self-locking combined connector and installation method for shield tunnel annular seams, which has both tensile and shear resistance and can be assembled quickly, thereby solving at least one technical problem involved in the background technology.

[0006] In order to solve the above-mentioned technical problems, the present invention is achieved as follows: The embodiment of the present invention provides a novel self-locking combined connector for annular seams of shield tunnels, comprising a male plug and two female plugs arranged at both ends of the male plug and used to be fixed in two adjacent pipe segments respectively, the male plug comprising a bolt body, both ends of which are respectively provided with an inverted truncated cone-shaped portion; the female plug comprising an embedded sleeve, a four-block pad, a sliding bearing and a spring, the embedded sleeve being used to be embedded and fixed in the pipe segment and presenting an internal hollow shape with an opening, the embedded sleeve being provided with a cylindrical hole and a truncated cone hole extending from the cylindrical hole and connected to the opening; the sliding bearing is assembled in the cylindrical hole and can translate along the axial direction of the cylindrical hole; one end of the spring is fixed to the The embedded sleeve has one end fixed on the sliding support platform to drive the sliding support platform to translate toward the conical hole; the four-block pad includes a hollow cylindrical section sleeved on the sliding support platform and an elastic conical portion extending from the hollow cylindrical section and matching the conical hole in shape and with an expandable inner diameter; when the male plug and the female plug are plugged in, the inverted conical portion of the bolt body is first used to push the four-block pad backward and insert the inverted conical portion into the elastic conical portion, and then the spring is used to push the inverted conical portion backward, and the inner wall of the conical hole forces the inner diameter of the opening side of the elastic conical portion to shrink, thereby locking the inverted conical portion in the elastic conical portion.

[0007] Optionally, the male plug further includes a shear pin sleeved in a middle area of ​​the bolt body.

[0008] Optionally, the female plug also includes a limit rod disposed in the sliding support and used to limit the socket amount of the bolt body.

[0009] Optionally, the shear pin is fixedly connected to the bolt body via a tenon and mortise.

[0010] Optionally, the hollow cylindrical section of the four-block cushion block is fixedly connected to the sliding support platform via a concave and convex tenon.

[0011] Optionally, the spring is a high-strength spring.

[0012] Optionally, three grooves are arranged on the outer side surface of the hollow cylindrical section of the four-block spacer along the circumferential direction to constrain the opening of the hollow cylindrical section through a spring.

[0013] The present invention also provides a method for installing a novel self-locking combined connector for annular seams of shield tunnels, the method comprising the following steps: Step S1, opening the embedded sleeve and placing the spring into the inner space of the embedded sleeve; Step S2, assembling and connecting the four-block cushion block with the sliding platform; Step S3, assembling the assembled sliding platform and the four-block cushion block into the inner space of the embedded sleeve, and compressing the spring, with one end of the spring abutting against the closed side of the embedded sleeve and the other end embedded in the opening of the sliding platform; Step S4, the outer side surface of the elastic truncated cone portion of the four-block cushion block coincides with the inner side surface of the truncated cone hole of the embedded sleeve, the sliding platform is located in the cylindrical section of the inner space of the embedded sleeve, and a female plug is obtained after the assembly is completed; Step S5, assembling and connecting the bolt body and the shear pin through the concave and convex tenon to form a male plug; Step S6, embedding the two assembled female plugs into the front segment and the rear segment respectively, with the open end of the embedded sleeve facing the outer wall of the segment joint, and reserving the assembly holes for the shear pin and the bolt body when casting the segment; Step S7, after aligning the male plug assembled by the main bolt and the shear pin with the opening of the female plug, it is inserted into the embedded sleeve in the pipe segment, the inverted truncated cone portion of the bolt body pushes the four-block pad backward and inserts the inverted truncated cone portion into the elastic truncated cone portion, and then the spring is used to push the inverted truncated cone portion backward, the inner wall of the truncated cone hole forces the inner diameter of the opening side of the elastic truncated cone portion to shrink, thereby locking the inverted truncated cone portion in the elastic truncated cone portion, thereby limiting the removal of the male plug.

[0014] The beneficial effects of the embodiments of the present invention are: 1. It has both tensile and shear resistance and can be assembled quickly.

[0015] 2. The combination of shear pin and bolt body can change the shear state of the bolt body when the annular seam is misaligned, reduce the volume of the plastic zone of the bolt body, alleviate the direct contact between the bolt body and the pipe segment, reduce the local damage of the pipe segment caused by stress concentration, and effectively reduce the risk of water leakage in the annular seam.

[0016] 3. When the inverted truncated cone-shaped part of the bolt body, the elastic truncated cone part of the four-block pad and the truncated cone hole of the embedded sleeve are in the locked state, the force contact surfaces of each component are mainly subjected to compressive stress and friction stress, which avoids shear failure of each component due to shear force, ensures that the damage site of the new male plug mainly occurs at the bolt site, and prevents the tensile performance of the male plug from failing due to the failure of the locking mechanism.

[0017] 4. The contact surface between the hollow shear pin and the bolt is provided with a concave and convex tenon to improve the integrity of the male plug, thereby preventing the hollow shear pin and the bolt from slipping during the service of the male plug. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which: Figure 1 A schematic diagram of the overall cross-sectional structure of a novel self-locking combined connector for annular seams of shield tunnels provided by an embodiment of the present invention; Figure 2 A schematic diagram of the structure of the shear pin provided by the embodiment of the present invention before being inserted into the embedded part; Figure 3 A schematic diagram of the structure of a shear pin provided by an embodiment of the present invention after being inserted into an embedded part; Figure 4 A schematic diagram of the structure of a new self-locking combined connector for annular seams of shield tunnels provided in an embodiment of the present invention after assembly. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] The terms "first", "second", etc. in the specification and claims of the present invention are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0021] See also Figures 1 to 4 As shown, an embodiment of the present invention provides a new self-locking combined connector for annular seams of shield tunnels, including a male plug and two female plugs arranged at both ends of the male plug and used to be fixed in two adjacent segments respectively.

[0022] The male plug includes a bolt body 5 and a shear pin 2 sleeved in the middle area of ​​the bolt body 5. The shear pin 2 is used in combination with the bolt body 5, so that the shear state of the bolt can be changed when the annular seam is misaligned, the volume of the plastic zone of the bolt body 5 can be reduced, the direct contact between the bolt body 5 and the pipe segment can be alleviated, the local damage to the pipe segment caused by stress concentration can be reduced, and the risk of water leakage in the annular seam can be effectively reduced.

[0023] Specifically, the shear pin 2 is fixedly connected to the bolt body 5 via a groove and tenon, and the provision of the groove and tenon improves the integrity of the male plug and prevents the hollow shear pin and the bolt from slipping during the service of the male plug.

[0024] The two ends of the bolt body 5 are respectively provided with an inverted truncated cone-shaped portion 51 .

[0025] The female plug includes an embedded sleeve 1, a four-block pad 3, a sliding platform 4, a spring 6 and a limit rod 7. The embedded sleeve 1 is used to be embedded and fixed in the pipe segment and is hollow inside with an opening. The embedded sleeve 1 is provided with a cylindrical hole 11 and a conical hole 12 extending from the cylindrical hole 11 and connected to the opening.

[0026] The sliding platform 4 is assembled in the cylindrical hole 11 and can translate along the axial direction of the cylindrical hole 11 .

[0027] The spring 6 is a high-strength spring, one end of which is fixed in the embedded sleeve 1 , and the other end is fixed on the sliding platform 4 to drive the sliding platform 4 to translate toward the truncated cone hole 12 .

[0028] The four-block cushion block 3 includes a hollow cylindrical section 31 sleeved on the sliding support 4 and an elastic truncated cone portion 32 extending from the hollow cylindrical section 31 and having an outer shape matching the truncated cone hole and an expandable inner diameter.

[0029] Specifically, the hollow cylindrical section 31 of the four-block cushion block 3 is fixedly connected to the sliding platform 4 through a concave and convex tenon.

[0030] Three grooves 33 are arranged on the outer side surface of the hollow cylindrical section 31 along the circumferential direction to set a spring to constrain the opening of the hollow cylindrical section 31 .

[0031] The limiting rod 7 is arranged in the sliding platform 4 and is used to limit the insertion amount of the bolt body 5 .

[0032] When the male plug is socketed with the female plug, the inverted truncated cone 51 of the bolt body 5 is first used to push the four-block pad 3 backward and insert the inverted truncated cone 51 into the elastic truncated cone 32. At this time, the spring 6 is used to push the inverted truncated cone 51 backward. The inner wall of the truncated cone hole forces the inner diameter of the opening side of the elastic truncated cone 32 to shrink, thereby locking the inverted truncated cone 51 in the elastic truncated cone 32.

[0033] In general, when the inverted truncated cone-shaped portion 51 of the bolt body 5, the elastic truncated cone portion 32 of the four-block pad 3 and the truncated cone hole 12 of the embedded sleeve 1 are in the locked state, the force-bearing contact surfaces of each component are mainly subjected to compressive stress and friction stress, thereby avoiding shear failure of each component due to shear force, ensuring that the damage site of the new male plug mainly occurs at the bolt site, and preventing the tensile performance of the male plug from failing due to the failure of the locking mechanism.

[0034] The present invention also provides a method for installing a novel self-locking combined connector for annular seams of shield tunnels, the method comprising the following steps: Step S1, opening the embedded sleeve 1 and placing the spring 6 into the inner space of the embedded sleeve 1; Step S2, assembling and connecting the four-block cushion block 3 and the sliding platform 4; Step S3, assembling the assembled sliding platform 4 and the four-block cushion block 3 into the inner space of the embedded sleeve 1, and compressing the spring 6, with one end of the spring 6 abutting against the closed side of the embedded sleeve 1, and the other end being embedded in the opening of the sliding platform 4; Step S4, the outer side surface of the elastic truncated cone portion 32 of the four-block cushion block 3 coincides with the inner side surface of the truncated cone hole of the embedded sleeve 1, and the sliding platform 4 is located in the cylindrical section of the inner space of the embedded sleeve 1, and a female plug is obtained after the assembly is completed; Step S5, assembling and connecting the bolt body 5 and the shear pin 2 through the concave and convex tenon to form a male plug; Step S6, embedding the two assembled female plugs into the front segment and the rear segment respectively, with the opening end of the embedded sleeve 1 facing the outer wall of the segment joint, and reserving the assembly holes for the shear pin 2 and the bolt body 5 when casting the segment; Step S7, after aligning the male plug assembled by the bolt body 5 and the shear pin 2 with the opening of the female plug, it is inserted into the embedded sleeve 1 in the pipe segment, and the inverted truncated cone shaped portion 51 of the bolt body 5 pushes the four-block pad 3 backward and inserts the inverted truncated cone shaped portion 51 into the elastic truncated cone portion 32. At this time, the spring 6 is used to push the inverted truncated cone shaped portion 51 backward, and the inner wall of the truncated cone hole forces the inner diameter of the opening side of the elastic truncated cone portion 32 to shrink, thereby locking the inverted truncated cone shaped portion 51 in the elastic truncated cone portion 32, thereby limiting the removal of the male plug.

[0035] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0036] In addition, it should be noted that the scope of the methods and systems in the embodiments of the present invention is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0037] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A new self-locking combined connector for shield tunnel annular seam, characterized in that: It comprises a male plug and two female plugs arranged at both ends of the male plug and used to be fixed in two adjacent pipe segments respectively, the male plug comprises a bolt body, and both ends of the bolt body are respectively provided with an inverted truncated cone-shaped portion; the female plug comprises an embedded sleeve, a four-block pad, a sliding bearing and a spring, the embedded sleeve is used to be embedded and fixed in the pipe segment and is in an internal hollow shape with an opening, the embedded sleeve is provided with a cylindrical hole and a truncated cone hole extending from the cylindrical hole and connected to the opening; the sliding bearing is assembled in the cylindrical hole and can translate along the axial direction of the cylindrical hole; one end of the spring is fixed in the embedded sleeve, and the other end is fixed in the embedded sleeve. The sliding support is used to drive the sliding support to translate toward the conical hole; the four-block cushion block includes a hollow cylindrical section sleeved on the sliding support and an elastic conical portion extending from the hollow cylindrical section and having an outer shape matching the conical hole and an expandable inner diameter; when the male plug and the female plug are plugged together, the inverted conical portion of the bolt body is first used to push the four-block cushion block backward and insert the inverted conical portion into the elastic conical portion, and then the spring is used to push the inverted conical portion backward, and the hole wall of the conical hole forces the inner diameter of the opening side of the elastic conical portion to shrink, thereby locking the inverted conical portion in the elastic conical portion.

2. The novel self-locking combined connector for shield tunnel annular seam according to claim 1 is characterized in that: The male plug also includes a shear pin sleeved in the middle area of ​​the bolt body.

3. The novel self-locking combined connector for shield tunnel annular seam according to claim 1 is characterized in that: The female plug also includes a limiting rod which is arranged in the sliding support and is used to limit the socket amount of the bolt body.

4. The novel self-locking combined connector for shield tunnel annular seam according to claim 2 is characterized in that: The shear pin is fixedly connected to the bolt body via a concave-convex tenon.

5. The novel self-locking combined connector for shield tunnel annular seam according to claim 1 is characterized in that: The hollow cylindrical section of the four-block cushion block is fixedly connected to the sliding support platform through a concave and convex tenon.

6. The novel self-locking combined connector for shield tunnel annular seam according to claim 1, characterized in that: The spring is a high-strength spring.

7. The novel self-locking combined connector for shield tunnel annular seam according to claim 5 is characterized in that: The outer side surface of the hollow cylindrical section of the four-block cushion block is provided with three grooves along the circumferential direction to constrain the opening of the hollow cylindrical section through a spring.

8. A method for installing a novel self-locking combined connector for annular seams of shield tunnels according to any one of claims 1 to 7, characterized in that: The installation method includes the following steps: Step S1, opening the embedded sleeve and placing the spring into the inner space of the embedded sleeve; Step S2, assembling and connecting the four-block cushion block with the sliding platform; Step S3, assembling the assembled sliding platform and the four-block cushion block into the inner space of the embedded sleeve, and compressing the spring, with one end of the spring abutting against the closed side of the embedded sleeve and the other end embedded in the opening of the sliding platform; Step S4, the outer side surface of the elastic truncated cone portion of the four-block cushion block coincides with the inner side surface of the truncated cone hole of the embedded sleeve, the sliding platform is located in the cylindrical section of the inner space of the embedded sleeve, and a female plug is obtained after the assembly is completed; Step S5, assembling and connecting the bolt body and the shear pin through the concave and convex tenon to form a male plug; Step S6, embedding the two assembled female plugs into the front segment and the rear segment respectively, with the open end of the embedded sleeve facing the outer wall of the segment joint, and reserving the assembly holes for the shear pin and the bolt body when casting the segment; Step S7, after aligning the male plug assembled by the main bolt and the shear pin with the opening of the female plug, it is inserted into the embedded sleeve in the pipe segment, the inverted truncated cone portion of the bolt body pushes the four-block pad backward and inserts the inverted truncated cone portion into the elastic truncated cone portion, and then the spring is used to push the inverted truncated cone portion backward, the inner wall of the truncated cone hole forces the inner diameter of the opening side of the elastic truncated cone portion to shrink, thereby locking the inverted truncated cone portion in the elastic truncated cone portion, thereby limiting the removal of the male plug.

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