A self-tightening quick-connect segment connection structure and its application method

Abstract

This invention discloses a self-tightening quick-connect segment connection structure for use in shield tunnels. Multiple sets of bolts are evenly spaced on the contact surfaces between segments. Each set includes: a first bolt and a second bolt, respectively fixed to the opposing contact surfaces of two segments and arranged opposite each other; a nut with symmetrical reverse threads inside and a threadless section on the outer side of the reverse threads; a first annular limiting member and a second annular limiting member, pre-placed inside the nut and positioned near the center, and threadedly connected to the nut; a first annular tightening member and a second annular tightening member, both with internal thread sections on their inner walls and external thread sections on their outer walls; a stepped surface connected to the annular tightening member via a first sliding limiting mechanism; and annular tightening members and annular limiting members connected via a second sliding limiting mechanism. This invention achieves self-tightening quick-connection between segments, improves the shear resistance between segments, and reduces the bolt rusting process.

Description

Technical Field

[0001] This invention relates to the field of subway construction tunnel technology, and more specifically to a self-tightening quick-connect segment connection structure and its application method. Background Technology

[0002] Today, my country's major cities have developed subway facilities for thousands of kilometers. Shield tunnels are the main type of urban tunnels. During the construction of shield tunnels, adjacent segments are mainly fastened with bolts. In the fastening process, there are two main problems: First, bolt fastening relies on manual labor, which is labor-intensive and makes it difficult to guarantee the construction effect; second, there are a lot of gaps at the bolt positions, which will accelerate the rusting and cracking of the segments and bolts.

[0003] Nowadays, bolted connection of pipe segments requires openings on the side facade and the arc surface of the pipe segment before bolt connection. Since the opening positions need to be large enough to install nuts, several large holes need to be opened on the arc surface of the pipe segment. At the same time, the number of openings should not be too many, otherwise the effective load-bearing volume of the pipe segment will be reduced.

[0004] In view of this, it is necessary to improve the bolt fastening method in the existing technology in order to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to disclose a self-tightening quick-connect pipe segment connection structure and application method to solve the above-mentioned technical problems, realize the self-tightening quick-connect between pipe segments, improve the shear resistance between pipe segments, avoid bolt backing, fill gaps, and reduce the bolt rusting process.

[0006] To achieve the above objectives, the present invention provides a self-tightening quick-connect segment connection structure for use in shield tunnels, wherein multiple sets are equally spaced on the contact surfaces between segments, each set comprising:

[0007] The first bolt and the second bolt are respectively fixed to the opposite contact surfaces of the two segments and are arranged facing each other. The first bolt and the second bolt have the same structure and both include:

[0008] The cylindrical connecting section is used to form a fixed connection with the tunnel lining segments;

[0009] A cylindrical threaded section is located at the end of the cylindrical connecting section opposite to the tube segment, and its outer diameter is smaller than that of the cylindrical connecting section. A stepped surface is formed between the cylindrical threaded section and the cylindrical connecting section.

[0010] A tapered protrusion is arranged at the outer end of the cylindrical threaded section;

[0011] The nut has symmetrical reverse threads inside, and an unthreaded section outside the reverse threads. Notches are opened on both outer edges of the nut.

[0012] The first and second annular limiting members are pre-placed inside the nut and arranged near the center, and are threadedly connected to the nut.

[0013] Both the first and second annular tightening parts have internal thread sections on their inner walls that mate with the cylindrical thread section, and external thread sections on their outer walls that mate with the thread of the nut.

[0014] The stepped surface and the annular tightening component are connected and engaged by a first sliding limiting mechanism.

[0015] The annular tightening component and the annular limiting component are connected and cooperated by a second sliding limiting mechanism;

[0016] By applying opposing pressure to the two segments, the annular tightening member rotates relative to the annular limiter and the relative bolt through the first sliding limiter mechanism and the second sliding limiter mechanism, so that the bolt, the annular tightening member and the annular limiter are fastened together.

[0017] The chemical container is arranged inside the annular limiting member, and under the action of the conical protrusion, it releases chemical agent to fill the gap inside the nut.

[0018] As a further improvement of the present invention, the first sliding limiting mechanism includes:

[0019] The first connecting post has multiple posts, which are arranged in a ring at intervals on the stepped surface and are arranged parallel to the cylindrical threaded section, and have a first protrusion at the top;

[0020] Multiple first arc-shaped limiting grooves are opened on the side end face of the annular tightening member relative to the bolt, respectively forming a sliding limiting fit with the first connecting column. The contact end of the first arc-shaped limiting groove and the first connecting column forms a first flared part for the first protrusion to pass through.

[0021] The bottom of the first arc-shaped limiting groove is provided with a first inclined platform, which is used to drive the annular tightening member to rotate under the opposing pressure applied by the two tube segments, so that the annular tightening member is tightly fitted with the bolt.

[0022] The second sliding limit mechanism includes:

[0023] The second connecting post has multiple posts, which are arranged in a ring at intervals on the side end face of the annular tightening member relative to the annular limiting member, and are arranged parallel to the cylindrical threaded section, and have a second protrusion at the top.

[0024] Multiple second arc-shaped limiting grooves are opened on the side end face of the annular limiting member relative to the annular tightening member, respectively forming a sliding limiting fit with the second connecting post. The contact end of the second arc-shaped limiting groove and the second connecting post forms a second flared part for the second protrusion to pass through.

[0025] The bottom of the second arc-shaped limiting groove is provided with a second inclined platform, which is used to drive the annular tightening member to rotate under the opposing pressure applied by the two tube segments, so that the annular tightening member and the annular limiting member are tightly fitted together.

[0026] As a further improvement of the present invention, the tube segment has a cylindrical hole on the outer periphery of the bolt for the nut to be inserted.

[0027] As a further improvement of the present invention, the nut has an arc-shaped flange along the circumferential direction on the inner wall of the notch; the bolt has an annular groove on its outer periphery that mates with the arc-shaped flange.

[0028] This invention also discloses an application method for a self-tightening quick-connect segment connection structure, comprising the following steps:

[0029] S1, firstly, the cylindrical connecting section of the bolt is welded to the steel cage inside the segment, and after concrete is poured, it is formed. Then, a cylindrical hole is opened on the segment around the bolt, and a nut is inserted later.

[0030] S2, the first annular limiting member and the second annular limiting member are symmetrically pre-positioned inside the nut and arranged near the center by means of threaded rotation, and a certain gap is maintained between the first annular limiting member and the second annular limiting member. A reagent container filled with chemical reagent is placed inside the first annular limiting member and the second annular limiting member in advance.

[0031] S3, a first annular tightening member is arranged on the first bolt, and a second annular tightening member is arranged on the second bolt. With the assistance of a mechanical device, the first bolt, the second bolt, and the nut are simultaneously engaged. The mechanical device applies opposing pressure to the two segments. The first annular tightening member and the second annular tightening member slide opposite each other on the unthreaded section until the second connecting column engages with the second arc-shaped limiting groove. The first annular tightening member and the second annular tightening member rotate synchronously relative to the nut and are threadedly connected to the nut until the first annular tightening member is in contact with the first annular limiting member and the second annular tightening member is in contact with the second annular limiting member.

[0032] S4, after the annular limiting member and the annular tightening member are engaged, the first connecting column and the first arc-shaped limiting groove begin to cooperate. Under the opposing pressure continuously applied by the mechanical device to the two tube segments, the annular tightening member and the annular limiting member rotate synchronously and move towards the center of the nut. At the same time, the cylindrical thread section and the internal thread section begin to engage with each other until the first bolt and the first annular tightening member are engaged, and the second bolt and the second annular tightening member are engaged, realizing the final connection of the bolt and nut. The agent container is punctured by the conical protrusion, and the chemical agent is released to fill the gap between the bolt and the nut.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] (1) A self-tightening quick-connect segment connection structure adopts a quick-connect structure. It only requires opening holes at equal intervals on the side elevation of the segment, prefabricating bolt joints, and connecting them with nuts. The overall volume loss of this structure is reduced, the resistance to shear force between adjacent segments is improved, and the gaps are filled by effective chemical agents, reducing the bolt rusting process. Because the bolts designed in this scheme can achieve quick connection between adjacent segments, they inhibit backlash and have a chemical sealing effect. Therefore, workers do not need to manually tighten the bolts, reducing the expected effect under secondary human intervention and greatly improving the efficiency of segment installation.

[0035] (2) An application method of a self-tightening quick-connect pipe segment connection structure, by prefabricating bolt joints between two pipe segments, based on the connection structure, the connection between the pipe segments can be completed by applying opposing stress to the two pipe segments. This connection method is simple and quick, and the connection is strong, saving a lot of manpower and improving construction efficiency.

[0036] (3) In the actual process of implementation, the position and number of bolts can be adjusted by opening holes on the segments according to the stress requirements and segment size; the composition of the agent can be adjusted according to relevant research; the design of this scheme reduces the opening volume of the original anchors on the segments, enhances the integrity of the segments, and at the same time, the entire process of the anchors playing their role reduces human intervention and ensures production efficiency and effectiveness. Attached Figure Description

[0037] Figure 1 This is a partial assembly diagram of the segment and the connection structure in the self-tightening quick-connect segment connection structure and application method of the present invention, and only one side of the connection structure is shown in the figure.

[0038] Figure 2 for Figure 1 Enlarged view of point a in the middle;

[0039] Figure 3This is an exploded view of the connection structure in the self-tightening quick-connect segment connection structure and application method of the present invention, and only one side of the connection structure is shown in the figure;

[0040] Figure 4 for Figure 3 Assembly diagram;

[0041] Figure 5 This is a schematic diagram of the bolt structure in the self-tightening quick-connect segment connection structure and application method of the present invention;

[0042] Figure 6 This is a schematic diagram of the annular tightening component in the self-tightening quick-connect segment connection structure and application method of the present invention;

[0043] Figure 7 This is a schematic diagram of the annular limiting component in the self-tightening quick-connect segment connection structure and application method of the present invention;

[0044] Figure 8 This is a schematic diagram of the nut structure in the self-tightening quick-connect segment connection structure and application method of the present invention.

[0045] In the diagram: 10, segment; 11, bolt; 21, nut; 31, annular limiting component; 41, annular tightening component; 51, medicine container; 60, first arc-shaped limiting groove; 61, first connecting post; 70, second arc-shaped limiting groove; 71, second connecting post; 110, annular groove; 111, cylindrical connecting section; 112, cylindrical threaded section; 113, conical protrusion; 210, notch; 211, arc-shaped flange; 212, reverse thread; 213, unthreaded section; 411, external threaded section; 412, internal threaded section; 600, first flared section; 611, first protrusion; 700, second flared section; 701, second inclined platform; 711, second protrusion. Detailed Implementation

[0046] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. However, it should be noted that these embodiments are not intended to limit the present invention. Equivalent changes or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0047] Please refer to Figures 1 to 8 The illustration shows a specific embodiment of the self-tightening quick-connect segment connection structure of the present invention.

[0048] A self-tightening quick-connect segment 10 connection structure is used in shield tunnels. Multiple sets of bolts 10 are evenly spaced on the contact surfaces between segments 10. Each set includes: a first bolt 11 and a second bolt 11, respectively fixed to the opposing contact surfaces of the two segments 10 and arranged opposite each other. The first bolt 11 and the second bolt 11 have the same structure, both including: a cylindrical connecting section 111 for fixed connection with the segment 10; a cylindrical threaded section 112 located at the end of the cylindrical connecting section 111 away from the segment 10, with an outer diameter smaller than the outer diameter of the cylindrical connecting section 111; a stepped surface formed between the cylindrical threaded section 112 and the cylindrical connecting section 111; and a conical protrusion 113 arranged at the outer end of the cylindrical threaded section 112; used to pierce the agent container 51 placed inside the nut 21, and to facilitate connection when blindly connecting the segments 10.

[0049] Nut 21 has symmetrical reverse threads 212 inside, and an unthreaded section 213 on the outside of the reverse threads 212. Notches 210 are provided on both outer edges of nut 21. A first annular limiting member 31 and a second annular limiting member 31 are pre-placed inside nut 21 and arranged near the center, and are threadedly connected to nut 21. A first annular tightening member 41 and a second annular tightening member 41 both have internal thread sections 412 on their inner walls that mate with the cylindrical thread section 112, and internal thread sections 412 on their outer walls that mate with the threads of nut 21. The mating external thread section 411; the stepped surface and the annular tightening member 41 are connected and fitted through the first sliding limiting mechanism; the annular tightening member 41 and the annular limiting member 31 are connected and fitted through the second sliding limiting mechanism; by applying opposing pressure to the two tube segments 10, the annular tightening member 41 rotates relative to the annular limiting member 31 and relative to the bolt 11 through the first sliding limiting mechanism and the second sliding limiting mechanism, so that the bolt 11, the annular tightening member 41 and the annular limiting member 31 are fastened together;

[0050] The chemical container 51 is arranged inside the annular limiting member 31, and under the action of the conical protrusion 113, it releases chemical agents to fill the gap inside the nut 21.

[0051] The first sliding limiting mechanism includes: a first connecting post 61, having multiple posts arranged in a ring at intervals on the stepped surface and parallel to the cylindrical threaded section 112, with a first protrusion 611 at the top, the first protrusion 611 having a spherical structure; multiple first arc-shaped limiting grooves 60 opened on the side end face of the annular tightening member 41 relative to the bolt 11, which respectively form a sliding limiting engagement with the first connecting post 61, the contact end of the first arc-shaped limiting groove 60 and the first connecting post 61 forming a first flared portion 600 for the first protrusion 611 to pass through; the bottom of the first arc-shaped limiting groove 60 is provided with a first inclined platform, which is used to drive the annular tightening member 41 to rotate under the opposing pressure applied by the two tube segments 10, so that the annular tightening member 41 is tightly fitted with the bolt 11;

[0052] The second sliding limiting mechanism includes: a second connecting post 71, having multiple posts arranged in a ring at intervals on the side end face of the annular tightening member 41 relative to the annular limiting member 31, and arranged parallel to the cylindrical threaded section 112, with a second protrusion 711 at the top, the second protrusion 711 also being a spherical structure; multiple second arc-shaped limiting grooves 70 opened on the side end face of the annular limiting member 31 relative to the annular tightening member 41, respectively forming a sliding limiting engagement with the second connecting post 71, the contact end of the second arc-shaped limiting groove 70 and the second connecting post 71 forming a second flared portion 700 for the second protrusion 711 to pass through; a second inclined platform 701 provided at the bottom of the second arc-shaped limiting groove 70, used to drive the annular tightening member 41 to rotate under the opposing pressure applied by the two tube segments 10, so that the annular tightening member 41 and the annular limiting member 31 are tightly fitted together.

[0053] The first and second sliding limiting mechanisms can, on the one hand, drive the annular tightening member 41 to rotate under the action of force, so as to realize the fastening connection between the bolt 11, the annular tightening member 41 and the annular limiting member 31. On the other hand, they can overcome the shearing force at the connection of the tube segment 10, and avoid the relative displacement between the bolt 11 and the nut 21, which would cause the tube segment 10 to detach. They cleverly use the horizontal thrust to transform into a rotational connection between the bolt 11 and the nut 21, and can avoid the phenomenon of the bolt 11 retracting relative to the nut 21 caused by the ordinary threaded connection in the prior art, thus having a certain limiting function.

[0054] The tube segment 10 has a cylindrical hole on the outer periphery of the bolt 11 for the nut 21 to be inserted, so that the nut 21 is completely hidden in the tube segment 10. The inner wall of the nut 21 with a notch 210 has an arc-shaped flange 211 along the circumference; the outer periphery of the bolt 11 has an annular groove 110 that mates with the arc-shaped flange 211, so that the nut 21 and the bolt 11 finally form a snap-fit, forming the final fit.

[0055] This invention also discloses an application method for a self-tightening quick-connect pipe segment 10 connection structure, including the following steps: S1, firstly, the cylindrical connecting section 111 of the bolt 11 is welded to the reinforcing cage inside the pipe segment 10, and after concrete is poured, it is formed. A cylindrical hole is opened on the pipe segment 10 around the bolt 11, and a nut 21 is inserted later; S2, the first annular limiting member 31 and the second annular limiting member 31 are symmetrically pre-positioned inside the nut 21 and arranged near the center by means of threaded rotation, and the first annular limiting member 31 and the second annular limiting member 31 are positioned in a way that allows for rotation. A certain gap is maintained between 31. A chemical container 51 containing chemical reagents is placed inside the first annular limiting member 31 and the second annular limiting member 31 beforehand; S3, a first annular tightening member 41 is arranged on the first bolt 11, and a second annular tightening member 41 is arranged on the second bolt 11. With the assistance of the mechanical device, the first bolt 11, the second bolt 11 and the nut 21 are simultaneously connected. The mechanical device applies opposing pressure to the two tube segments 10. The first annular tightening member 41 and the second annular tightening member 41 are in the threadless section 213. The components slide upwards until the second connecting post 71 engages with the second arc-shaped limiting groove 70. Simultaneously, the first and second annular tightening members 41 rotate relative to the nut 21, forming a threaded connection with it, until the first annular tightening member 41 and the first annular limiting member 31 are in contact, and the second annular tightening member 41 and the second annular limiting member 31 are in contact; S4, after the annular limiting member 31 and the annular tightening member 41 are in contact, the first connecting post 61 and the first arc-shaped limiting groove 60 begin to engage, and the mechanical device adjusts the two segments... Under the continuous application of counter-pressure, the annular tightening member 41 and the annular limiting member 31 rotate synchronously and move towards the center of the nut 21. At the same time, the cylindrical thread section 112 and the internal thread section 412 begin to engage with each other until the first bolt 11 is in contact with the first annular tightening member 41 and the second bolt 11 is in contact with the second annular tightening member 41, thus achieving the final connection between the bolt 11 and the nut 21. The agent container 51 is punctured by the conical protrusion 113, and the chemical agent is released, thus filling the gap between the bolt 11 and the nut 21.

[0056] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A self-tightening quick joint structure of segments for use in a shield tunnel, a plurality of sets of which are provided at equal intervals on a contact surface between segments, characterized in that, Each group comprises: A first bolt and a second bolt are fixed on the opposite contact surfaces of the two segments respectively, and are arranged oppositely, the first bolt and the second bolt are the same in structure, and each comprises: A cylindrical connecting section for fixed connection with the segment; A cylindrical threaded section located at one end of the cylindrical connecting section away from the segment, and the outer diameter of the cylindrical threaded section is smaller than that of the cylindrical connecting section, and a stepped surface is formed between the cylindrical threaded section and the cylindrical connecting section; A conical protruding part arranged at the outer end of the cylindrical threaded section; A nut internally provided with symmetrical reverse threads, the outer side of the reverse threads is provided with a non-threaded section, and both sides of the outer edge of the nut are provided with notches; A first annular limiting member and a second annular limiting member are prearranged in the interior of the nut and arranged close to the center, and are threadedly connected with the nut; A first annular tightening member and a second annular tightening member, the inner wall of each is arranged with an inner threaded section matched with the cylindrical threaded section, and the outer wall of each is arranged with an outer threaded section matched with the threads of the nut; The stepped surface and the annular tightening member are connected and matched through a first sliding limiting mechanism; The annular tightening member and the annular limiting member are connected and matched through a second sliding limiting mechanism; By applying opposite pressure to the two segments, the annular tightening member rotates relative to the annular limiting member and the bolt through the first sliding limiting mechanism and the second sliding limiting mechanism in sequence, so that the bolt, the annular tightening member and the annular limiting member are tightly connected with each other; The medicament container is arranged in the annular limiting member, and under the action of the conical protruding part, the chemical medicament is released to fill the gap in the interior of the nut; The first sliding limiting mechanism comprises: A plurality of first connecting columns are arranged in a ring shape on the stepped surface and arranged in parallel with the cylindrical threaded section, and the top of each first connecting column is provided with a first protrusion; A plurality of first circular arc limiting grooves are arranged on the side end surface of the annular tightening member opposite to the bolt, and each first circular arc limiting groove is slidably and limitingly matched with the first connecting column, and a first flared portion through which the first protrusion passes is formed at the contact end of the first connecting column and the first circular arc limiting groove; The bottom of the first circular arc limiting groove is provided with a first inclined table for driving the annular tightening member to rotate under the opposite pressure applied by the two segments, so that the annular tightening member is tightly fitted with the bolt; The second sliding limiting mechanism comprises: A plurality of second connecting columns are arranged in a ring shape on the side end surface of the annular tightening member opposite to the annular limiting member, and arranged in parallel with the cylindrical threaded section, and the top of each second connecting column is provided with a second protrusion; A plurality of second circular arc limiting grooves are arranged on the side end surface of the annular limiting member opposite to the annular tightening member, and each second circular arc limiting groove is slidably and limitingly matched with the second connecting column, and a second flared portion through which the second protrusion passes is formed at the contact end of the second connecting column and the second circular arc limiting groove; The bottom of the second circular arc limiting groove is provided with a second inclined table for driving the annular tightening member to rotate under the opposite pressure applied by the two segments, so that the annular tightening member is tightly fitted with the annular limiting member.

2. The self-tightening and quick-coupling pipe segment connection structure according to claim 1, characterized in that, The segment is provided with a cylindrical hole at the outer periphery of the bolt for inserting the nut.

3. The self-tightening and quick-coupling pipe segment connection structure according to claim 1, characterized in that, The inner wall of the nut with the notch is provided with an arc-shaped flange in the circumferential direction; and the outer periphery of the bolt is provided with an annular groove matched with the arc-shaped flange.

4. A method of using the self-tightening and quick-coupling pipe piece connection structure according to claim 1, characterized in that, The method comprises the following steps: S1, first, the cylindrical connecting section of the bolt is welded with the reinforcement cage in the segment, and the concrete is poured to form a cylindrical hole on the outer periphery of the segment, and the nut is inserted later; S2, the first annular limiting member and the second annular limiting member are symmetrically pre-installed in the interior of the nut and arranged near the center by means of screwing, and a certain gap is reserved between the first annular limiting member and the second annular limiting member, and a medicament container filled with chemical medicament is placed in the interior of the first annular limiting member and the second annular limiting member in advance; S3, the first annular tightening member is arranged on the first bolt, and the second annular tightening member is arranged on the second bolt, and the first bolt and the second bolt are synchronously docked with the nut under the assistance of the mechanical device, the two segments are subjected to opposite pressure by the mechanical device, the first annular tightening member and the second annular tightening member slide on the non-threaded section in opposite directions, until the second connecting column cooperates with the second circular arc limiting groove, the first annular tightening member and the second annular tightening member synchronously rotate relative to the nut, and the thread connection with the nut is realized, until the first annular tightening member is attached to the first annular limiting member, and the second annular tightening member is attached to the second annular limiting member; S4, when the annular limiting member and the annular tightening member are attached, the first connecting column cooperates with the first circular arc limiting groove, under the continuous opposite pressure of the mechanical device on the two segments, the annular tightening member and the annular limiting member synchronously rotate and displace to the center of the nut, at the same time, the cylindrical threaded section cooperates with the internal threaded section, until the first bolt is attached to the first annular tightening member, and the second bolt is attached to the second annular tightening member, the final connection of the bolt and the nut is realized, the medicament container is pierced by the conical protruding part, the chemical medicament is released, and the gap between the bolt and the nut is filled.

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