Telescopic connection device for shield tunnel CT segment and segment assembly method

Abstract

The present invention discloses a telescopic connection device and a segment assembly method for shield tunnel CT segments, belonging to the technical field of shield tunnel segment connection. The connection device includes a first segment, a second segment connected to the first segment, a socket disposed on the first segment, and an insert disposed on the second segment and plugged and fixed to the socket to fix the first segment and the second segment, the insert including an insert component, a gear, a locking latch and a spring, the insert component including an insert portion matched with the socket, a toothed plate portion extending from the insert portion, and a tail portion extending from the toothed plate portion with a locking groove, the gear meshes with the toothed plate portion, the spring is connected to the locking latch to elastically drive the locking latch to be inserted into the locking groove, thereby effectively preventing the sealing gasket from falling off and warping after assembly due to the squeezing and displacement of the sealing gasket during the socket-insertion process.

Description

Technical Field

[0001] The invention belongs to the technical field of shield tunnel segment connection, and in particular relates to a telescopic connection device for a shield tunnel CT segment and a segment assembly method. Background Art

[0002] With the rapid development of urbanization, a large number of tunnels constructed using the shield method have been used in urban rail transit. Due to the unique structural characteristics of shield tunnels, the joint waterproofing of shield tunnels is also a major problem in the engineering community. The existing joint waterproofing system usually uses elastic sealing pads for joint sealing and waterproofing.

[0003] In order to improve the efficiency of segment assembly and joint stiffness, a new type of shield tunnel CT segment was proposed and applied to Japanese tunnel projects. This joint can significantly control the amount of joint opening and misalignment. However, due to the small connection gap between the male and female wedges of the CT segment, the contact surface of the joint waterproof gasket is squeezed and displaced during the socket assembly, and the gasket is subjected to tensile-shear stress. As the socket assembly of the CT segment continues, the tensile-shear stress on the gasket becomes greater and greater, and the bonding strength between the gasket and the groove becomes lower and lower, making it very easy for the gasket to detach from the groove and warp after the segment is assembled, which leads to the loss of the waterproof ability of the gasket and leakage. Summary of the invention

[0004] The purpose of an embodiment of the present invention is to provide a telescopic connection device and a segment assembly method for a shield tunnel CT segment. By designing the connection device to have a telescopic function, the insert is stretched first and then the connection device is socketed. This can effectively prevent the sealing gasket from falling off and warping after assembly due to squeezing and dislocation of the sealing gasket during the socketing process, thereby solving at least one technical problem involved in the background technology.

[0005] In order to solve the above-mentioned technical problems, the present invention is achieved as follows:

[0006] An embodiment of the present invention provides a telescopic connection device for shield tunnel CT segments, comprising a first segment, a second segment connected to the first segment, a socket component arranged on the first segment, and an insert component arranged on the second segment and plugged and fixed with the socket component to fixedly connect the first segment and the second segment, the insert component comprising an insertion component, a gear, a locking pin and a spring, the insertion component comprising an insertion portion cooperating with the socket component, a toothed plate portion extending from the insertion portion, and a tail portion extending from the toothed plate portion with a locking groove, the gear being meshed with the toothed plate portion, and the spring being connected to the locking pin to elastically drive the locking pin to be inserted into the locking groove.

[0007] Optionally, it also includes an outer sealing gasket and an inner sealing gasket arranged between the first pipe segment and the second pipe segment, the outer sealing gasket is arranged adjacent to the outer side of the pipe segment, and the inner sealing gasket is arranged adjacent to the inner side of the pipe segment.

[0008] Optionally, the first pipe segment and the second pipe segment are recessed with sealing gasket grooves at positions corresponding to the outer channel sealing gasket and the inner channel sealing gasket, and the outer channel sealing gasket and the inner channel sealing gasket are bonded and fixed in the sealing gasket grooves.

[0009] Optionally, the outer channel sealing gasket and the inner channel sealing gasket are made of any one selected from EPDM rubber, water-swellable rubber, chloroprene rubber and fluororubber.

[0010] Optionally, the insertion part is in a "T" shape, and the socket is a hollow rectangular component with one end open, including a cavity matching the shape of the insertion part, and the insertion part is inserted into the cavity of the socket to fixedly connect the first pipe segment and the second pipe segment.

[0011] Optionally, the insert also includes a gear rotating shaft, and the gear is rotatably mounted on the gear rotating shaft.

[0012] Optionally, there are two gears, which are disposed on opposite sides of the tooth plate portion.

[0013] Optionally, the insert further comprises a telescopic sleeve, the gear, the gear rotating shaft, the locking pin and the spring are all located inside the telescopic sleeve, and the rack portion and the tail end portion of the insert component are both located inside the telescopic sleeve.

[0014] Optionally, the socket component is buried in the first pipe segment, and the insert component is buried in the second pipe segment.

[0015] The present invention also provides a segment assembly method using the telescopic connection device for shield tunnel CT segments, comprising the following steps:

[0016] Step 1: Stretch the inserted component:

[0017] Before assembly, the insert member is stretched in advance to ensure that the inner seal gasket and the outer seal gasket do not come into contact when the insert member is inserted into the socket member;

[0018] Step 2: Segment socket positioning:

[0019] Position the insert component and the socket component together, and ensure that the inner channel sealing gasket and the outer channel sealing gasket do not come into contact at this time. If this cannot be satisfied, the stretching amount of the insert component should be adjusted in time;

[0020] Step 3: Socket-jointed CT segments:

[0021] Using the thrust of the shield machine jack to insert the insertion portion of the insertion component into the socket;

[0022] Step 4: Compress the inserted component:

[0023] The insert member is contracted by applying force through the shield machine's force arm. After contracting to a certain position, the locking pin enters the locking groove at the rear end of the insert member under the action of the spring thrust, thereby limiting the extension and contraction of the insert member and further limiting the opening of the segment joint.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. Preventing the elastic sealing gasket from falling off: The present invention provides sufficient installation space for assembling CT segments, and can prevent the elastic sealing gasket from falling off and warping.

[0026] 2. Improved waterproof capability of joints: The pipe segment assembly method provided by the present invention can prevent the elastic sealing gasket from falling off after assembly, so that the waterproof capability of the elastic sealing gasket can be fully exerted, thereby improving the waterproof capability of the joints.

[0027] 3. Simple construction process: The connection device and segment assembly method proposed in the present invention are fully automated and do not require manual intervention, with high construction efficiency.

[0028] 4. Scientific and reasonable: Under the connection device and the segment assembly method provided by the present invention, the improvement of the waterproof ability of the sealing gasket can be verified through relevant waterproof test tests, and the joint waterproof design can be carried out scientifically and reasonably, which has guiding significance for actual engineering. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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:

[0030] Figure 1 A schematic diagram of the structure of a telescopic connection device for a shield tunnel CT segment provided by the present invention;

[0031] Figure 2 A schematic diagram of the structure of the insert provided by the present invention;

[0032] Figure 3 This is a schematic diagram of the structure of the insert component after stretching of the present invention;

[0033] Figure 4This is a schematic diagram of the structure after the insert component of the present invention is inserted into the socket component;

[0034] Figure 5 This is a schematic structural diagram of the present invention using the thrust force of the shield machine jack to insert the insertion portion of the insertion component into the socket;

[0035] Figure 6 It is a structural schematic diagram of the present invention in which a jack arm applies a force to close the segment joint;

[0036] Figure 7 It is a schematic diagram of the structure after the pipe segment of the present invention is assembled.

[0037] In the figure: 1. first pipe segment; 2. second pipe segment; 3. socket; 4. insert; 401. insert member; 402. telescopic sleeve; 403. gear; 404. gear rotating shaft; 405. locking pin; 406. spring; 5. outer channel sealing gasket; 6. inner channel sealing gasket. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. 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.

[0039] See also Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a telescopic connection device for a shield tunnel CT segment, comprising a first segment 1, a second segment 2 connected to the first segment 1, a socket 3 arranged on the first segment 1, and an insert 4 arranged on the second segment 2 and plugged and fixed with the socket 3 to fixedly connect the first segment 1 and the second segment 2.

[0040] The insert 4 includes an insert component 401, a telescopic sleeve 402, a gear 403, a gear rotation shaft 404, a locking pin 405, and a spring 406. The insert component 401 includes an inserting portion that cooperates with the socket component 3, a toothed plate portion extending from the inserting portion, and a tail portion extending from the toothed plate portion with a locking groove. The gear 403 is meshed with the toothed plate portion, and the spring 406 is connected to the locking pin 405 to elastically drive the locking pin 405 to be inserted into the locking groove.

[0041] The first segment 1 and the second segment 2 are two adjacent segment blocks in the circumferential direction of the shield tunnel segment ring, both of which are made of concrete cast steel cages, and a sealing gasket groove is reserved during the casting process.

[0042] The insertion part is in a "T" shape, and the socket 3 is a hollow rectangular component with one end open, including a cavity matching the shape of the insertion part. The insertion part is inserted into the cavity of the socket 3 to fixedly connect the first pipe segment 1 and the second pipe segment 2.

[0043] The socket 3 is embedded in the right side of the first segment 1 when pouring concrete of the first segment 1, and the socket 3 is fixed in the first segment 1 by anchor bars, ensuring that the embedded position of the socket 3 is located in the center of the right side of the first segment 1.

[0044] The insert 4 is embedded in the left side of the second segment 2 when pouring concrete of the second segment 2, and is fixed in the second segment 2 by anchor bars, ensuring that the embedded position of the insert 4 is located in the center of the left side of the second segment 2.

[0045] The gear 403, the gear rotating shaft 404, the locking latch 405 and the spring 406 are all located inside the telescopic sleeve 402, and the rack portion and the tail end portion of the insertion member 401 are all located inside the telescopic sleeve 402. The insertion member 401 can be telescopic inside the telescopic sleeve 402, and the locking latch 405 and the spring 406 are embedded in the groove of the telescopic sleeve 402. When the insertion member 401 is retracted to a certain position, the locking latch 405 pops out under the action of the spring 406 to limit the telescopic extension of the insertion member 401.

[0046] The gear rotating shaft 404 is fixed to the telescopic sleeve 402 , and the gear 403 rotates around the gear rotating shaft 404 through the gear center hole, thereby driving the insertion member 401 to extend and retract.

[0047] The telescopic connection device also includes an outer sealing gasket 5 and an inner sealing gasket 6 arranged between the first pipe segment 1 and the second pipe segment 2, wherein the outer sealing gasket 5 is arranged adjacent to the outer side of the pipe segment, and the inner sealing gasket 6 is arranged adjacent to the inner side of the pipe segment.

[0048] The outer channel sealing gasket 5 and the inner channel sealing gasket 6 are bonded to the sealing gasket grooves of the two pipe segments by glue. The materials of the outer channel sealing gasket 5 and the inner channel sealing gasket 6 are not limited to EPDM rubber, but can also be water-swellable rubber, chloroprene rubber and fluororubber, etc. Other materials that can achieve the same or similar effects should also be within the protection scope of the present invention.

[0049] See also Figure 3~Figure 7 As shown, the present invention also provides a segment assembly method using the telescopic connection device for shield tunnel CT segments, comprising the following steps:

[0050] Step 1: Stretch the inserted component:

[0051] See also Figure 3 As shown, before assembly, the insert member 401 is stretched in advance to ensure that the outer sealing gasket 5 and the inner sealing gasket 6 do not come into contact when the insert member 401 is inserted into the socket 3. .

[0052] In a preferred embodiment, the socket 3 is a hollow rectangular member with one end open, including a cavity matching the shape of the insert portion, and can also be called a C-type member because of its shape similar to the letter C. The insert member 401 belongs to the insert 4. The insert member 401 has a telescopic function through the mechanical structure inside the insert 4.

[0053] The insert member 401 is meshed with the gear 403 and can be stretched and contracted inside the telescopic sleeve 402 as the gear 403 rotates. The locking pin 405 is reserved in the housing groove of the telescopic sleeve 402 and is provided with an outward thrust by the spring 406. When the insert member 401 is contracted to a predetermined position in the fourth step, the locking pin 405 springs into the locking groove at the rear end of the insert member 401, thereby limiting the extension and contraction of the insert member 401 after assembly is completed, and further limiting the opening of the pipe segment joint.

[0054] Specifically: the socket 3 is welded from a 10 mm thick steel plate and is a C-shaped component with one end open, and is pre-buried in the right end of the first pipe segment 1. The insert 4 is pre-buried in the left end of the second pipe segment 2.

[0055] The insert member 401 and the gear 403 are cut from a 50mm thick steel plate, and the locking groove of the insert member 401 has a depth of 30mm. The insertion portion of the insert member 401 is slightly smaller than the internal space of the socket 3 for socket insertion. The minimum cross section of the tooth plate portion of the insert member 401 should meet the engineering tensile strength requirements, and the cross-sectional area of ​​the locking pin 405 should also meet the engineering shear strength requirements. The diameter of the center hole of the gear 403 and the gear rotating shaft 404 is 10mm.

[0056] The outer shell of the telescopic sleeve 402 is welded from 10 mm steel plates, except for the groove where the outer shell is partially thickened by 20 mm.

[0057] Step 2: Segment socket positioning:

[0058] See also Figure 4 As shown, the insert component 401 is positioned together with the socket component 3, and it is ensured that the outer channel sealing gasket 5 and the inner channel sealing gasket 6 do not come into contact with each other at this time. If this cannot be satisfied, the stretching amount of the insert component 401 should be adjusted in time.

[0059] Step 3: Socket segment:

[0060] See also Figure 5 As shown, the insertion part of the insertion component 401 is inserted into the socket component 3 by utilizing the thrust of the shield machine jack. In this process, since the outer channel sealing gasket 5 and the inner channel sealing gasket 6 are not squeezed, the outer channel sealing gasket 5 and the inner channel sealing gasket 6 will not be subjected to the tensile-shearing effect during the socket-insertion process, which would reduce the bonding strength between the outer channel sealing gasket 5 and the inner channel sealing gasket 6 and the concrete pipe segment, thereby preventing the outer channel sealing gasket 5 and the inner channel sealing gasket 6 from falling off or warping after the assembly is completed.

[0061] Step 4: Compress the inserted component:

[0062] See also Figure 6 As shown, due to the early stretching of the insert member 401, the segment joints are not closed after the third step of socket-spiking is completed, and the jack arm is required to apply force to close the segment joints, and the outer channel sealing pad 5 and the inner channel sealing pad 6 are compressed to exert waterproofing ability. Figure 7 As shown, at this time, the locking pin 405 enters the locking groove at the rear end of the insertion member 401 under the thrust of the spring 406, thereby limiting the extension and contraction of the insertion member 401 and further limiting the opening of the pipe segment.

[0063] The working principle of the above method is as follows: the insert member 401 in the insert 4 has a telescopic function. Before the pipe segment is assembled, the insert member 401 is stretched in advance. When the insert member 401 and the socket 3 are positioned and ready for socketing, the condition must be met. , so that the outer seal 5 and the inner seal 6 will not be squeezed and dislocated during the socket-spiking process. After the socket-spiking is completed, the shield machine arm is used to apply a force to shrink the insertion member 401. After shrinking to a certain position, the locking pin 405 pops out to limit the expansion and contraction of the insertion member 401, thereby limiting the opening of the pipe segment joint, so that the waterproof performance of the outer seal 5 and the inner seal 6 will be fully exerted without the outer seal 5 and the inner seal 6 falling off and warping.

[0064] During the assembly of CT segments in shield tunnels, due to the small connection gap between the male and female wedges, the joint waterproof gasket is easily subjected to a large extrusion force during the socket assembly and detached from the gasket groove, resulting in the loss of the joint waterproof ability. The telescopic connection device and segment assembly method of the CT segment proposed in the present invention can complete the socket connection of adjacent segments when the gasket is not under pressure, and then compress the inserted component through the segment lifting arm, so that the joint waterproof gasket is squeezed to exert its waterproof ability. After the locking pin takes effect, it limits the expansion and contraction of the inserted component, thereby limiting the opening of the segment joint, which can effectively improve the waterproof ability of the inner and outer waterproof gaskets and prevent leakage, thereby improving the safety and long-term stability during tunnel construction and operation, and reducing construction costs.

[0065] 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.

[0066] 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.

[0067] The embodiments of the present invention are described above, but the present invention is not limited to the above-mentioned specific implementation modes. The above-mentioned specific implementation modes are merely illustrative and not 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 purpose of the present invention and the claims, all of which are protected by the present invention.

Claims

1. A segment assembly method using a telescopic connection device for shield tunnel CT segments, characterized in that: The telescopic connection device for shield tunnel CT segments comprises a first segment, a second segment connected to the first segment, a socket disposed on the first segment, and an insert disposed on the second segment and plugged and fixed with the socket to fix the first segment and the second segment, the insert comprising an insert component, a gear, a locking pin and a spring, the insert component comprising an insert portion matched with the socket, a toothed plate portion extending from the insert portion, and a tail portion extending from the toothed plate portion with a locking groove, the gear meshing with the toothed plate portion, the spring connected with the locking pin to elastically drive the locking pin to be inserted into the locking groove; the telescopic connection device also comprises an outer seal and an inner seal disposed between the first segment and the second segment, the outer seal being disposed adjacent to the outer side of the segment, and the inner seal being disposed adjacent to the inner side of the segment, and the segment assembly method using the telescopic connection device for shield tunnel CT segments comprises the following steps: Step 1: Stretch the inserted component: Before assembly, the insert member is stretched in advance to ensure that the inner seal gasket and the outer seal gasket do not come into contact when the insert member is inserted into the socket member; Step 2: Segment socket positioning: Position the insert component and the socket component together, and ensure that the inner channel sealing gasket and the outer channel sealing gasket do not come into contact at this time. If this cannot be satisfied, the stretching amount of the insert component should be adjusted in time; Step 3: Socket-jointed CT segments: Using the thrust of the shield machine jack to insert the insertion portion of the insertion component into the socket; Step 4: Compress the inserted component: The insert member is contracted by applying force through the shield machine's force arm. After contracting to a certain position, the locking pin enters the locking groove at the rear end of the insert member under the action of the spring thrust, thereby limiting the extension and contraction of the insert member and further limiting the opening of the segment joint.

2. The segment assembly method using the telescopic connection device for shield tunnel CT segments according to claim 1 is characterized in that: The first pipe segment and the second pipe segment are recessed with sealing gasket grooves at positions corresponding to the outer channel sealing gasket and the inner channel sealing gasket, and the outer channel sealing gasket and the inner channel sealing gasket are bonded and fixed in the sealing gasket grooves.

3. The segment assembly method using the telescopic connection device for shield tunnel CT segments according to claim 1 or 2, characterized in that: The outer channel sealing gasket and the inner channel sealing gasket are made of any one selected from EPDM rubber, water-swellable rubber, chloroprene rubber and fluororubber.

4. The segment assembly method using the telescopic connection device for shield tunnel CT segments according to claim 3 is characterized in that: The insertion part is in a "T" shape, the socket is a hollow rectangular component with one end open, the socket includes a cavity matching the shape of the insertion part, and the insertion part is inserted into the cavity of the socket to fixedly connect the first pipe segment and the second pipe segment.

5. The segment assembly method using the telescopic connection device for shield tunnel CT segments according to claim 1, characterized in that: The insert also includes a gear rotating shaft, and the gear is rotatably mounted on the gear rotating shaft.

6. The segment assembly method using the telescopic connection device for shield tunnel CT segments according to claim 5, characterized in that: The number of the gears is two and they are arranged on two opposite sides of the tooth plate portion.

7. The segment assembly method using the telescopic connection device for shield tunnel CT segments according to claim 5, characterized in that: The insert also includes a telescopic sleeve, the gear, the gear rotation shaft, the locking pin and the spring are all located inside the telescopic sleeve, and the tooth plate portion and the tail end portion of the insert component are both located inside the telescopic sleeve.

8. The segment assembly method using the telescopic connection device for shield tunnel CT segments according to claim 1, characterized in that: The socket is buried in the first pipe segment, and the insert is buried in the second pipe segment.

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