Shield tunnel and subway station interface waterproof sealing structure and construction method

Abstract

The invention discloses a shield tunnel and subway station connector waterproof sealing structure and a construction method, and belongs to the technical field of subway engineering.The shield tunnel and subway station connector waterproof sealing structure comprises a shield tunnel, an end well side wall connected with the end of the shield tunnel through a ring beam, and water stop steel rings arranged at the connecting position of the ring beam and the end well side wall and the connecting position of the ring beam and the shield tunnel; the water stop steel ring comprises a steel ring body, a first steel ring body arranged in the ring beam and a first steel ring body arranged in the end well side wall and the shield tunnel, and further comprises a flexible waterproof structure capable of stretching or contracting. One end of the waterproof structure is provided with an edge pressing strip pre-buried in the shield tunnel and the side wall of the end well, and the other end of the waterproof structure is provided with a clamping ring body capable of surrounding the first steel ring body and used for surrounding the first steel ring body in the circumferential direction, so that the waterproof structure and the first steel ring body are in continuous tight sealing contact. According to the invention, the problem of waterproof failure at the interface caused by displacement between structures due to structure expansion or contraction and settlement is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of subway engineering, and in particular to a waterproof sealing structure for an interface between a shield tunnel and a subway station and a construction method. Background Art

[0002] In subway underground stations, the end well refers to the "well" built at one end of the shield tunnel for entry and exit during shield construction. The end well is both a working well for shield construction and a part of the equipment room of the subway station. Due to the needs of shield operations, the end well is generally deeper than the standard section of the station. In subway projects, it is often encountered that the subway underground station and the shield tunnel are connected. The shield tunnel usually uses precast concrete segments, while the subway station is a cast-in-place concrete structure. Therefore, the interface part is often the weak link in construction and waterproofing, which is easy to cause a series of problems such as water leakage and cracking at the interface. In order to solve the above problems, the existing technology also has corresponding waterproof structures; For example, Chinese patent CN110005450B discloses a waterproof structure and construction method for the interface between a subway station and a shield tunnel, which includes a waterstop steel ring A, a waterstop steel ring B, a waterstop steel ring C and a waterstop steel ring D. The waterstop steel ring A is pre-buried in the side wall of the end shaft, and includes a steel cylinder A and a steel ring body A; the waterstop steel ring B is a circular flat plate structure, which is coaxially arranged with the steel cylinder A, and the waterstop steel ring B is fixed on the inner wall of the steel cylinder A and extends into the ring beam; the waterstop steel ring C is pre-buried in the pipe segment of the shield tunnel, and the waterstop steel ring C includes a steel ring body C and a steel cylinder C; the waterstop steel ring D is a cylindrical structure and is coaxially arranged with the shield tunnel, one end of the waterstop steel ring D is welded to the side of the waterstop steel ring C close to the ring beam, and the waterstop steel ring D is located in the ring beam. Although the waterproof structure has waterproof steel rings, waterproof steel rings, waterproof glue, and grouting pipes respectively set between the ring beam and the end well side wall, and between the ring beam and the shield tunnel, and stainless steel water receiving grooves are set at the joints to achieve multiple waterproof effects, there are still disadvantages. Due to temperature differences, the expansion coefficients between the structures are different. When the expansion or contraction, as well as the displacement between the structures caused by settlement, there is a problem of waterproof failure at the interface; Therefore, based on the above problems, it is necessary to provide a waterproof sealing structure and construction method for the interface between a shield tunnel and a subway station with good waterproof effect. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a waterproof sealing structure and construction method for the interface between a shield tunnel and a subway station, which is used to solve the problem of waterproof failure at the interface caused by temperature differences, structural expansion or contraction, and displacement between structures caused by settlement.

[0004] In order to achieve the above object, the present invention provides the following technical solutions: The present invention discloses a waterproof sealing structure for the interface between a shield tunnel and a subway station, comprising: A shield tunnel, a terminal shaft side wall connected to the end of the shield tunnel through a ring beam, a waterproof steel ring arranged at the connection position between the ring beam and the terminal shaft side wall and the ring beam and the shield tunnel, the waterproof steel ring comprising a steel ring body and a first steel ring body arranged in the ring beam, and a second steel ring body arranged in the terminal shaft side wall and the shield tunnel, wherein: it also includes a flexible waterproof structure that can be stretched or contracted; The waterproof structure is provided with a pressure edge strip pre-buried in the side walls of the shield tunnel and the end shaft at one end, and with a clamping ring body capable of surrounding the second steel ring body at the other end, for circumferentially embracing the second steel ring body so that the waterproof structure is in continuous and tightly sealed contact with the second steel ring body.

[0005] Furthermore, the snap ring body is a retractable elastic snap ring, which includes a steel wire and at least one spring, and the steel wire and the spring are connected end to end to form a closed ring structure.

[0006] Furthermore, the clamping ring body is a steel wire or rope that can be wrapped around the second steel ring body at least twice.

[0007] Furthermore, the waterproof structure includes a waterstop strip, a detour portion with an arc structure is formed at one end of the waterstop strip, and a straight extension section is formed at the other end. A plurality of pressure edge strips are evenly distributed circumferentially at the edge of the extension section, and at least one fold portion is formed in the middle of the waterstop strip.

[0008] Furthermore, the second steel ring body is fixedly connected with a positioning ring on the side of the steel ring body, and the positioning ring is formed with a positioning groove at the end of the second steel ring body, and the detour portion and the clamping ring body are accommodated through the positioning groove.

[0009] Furthermore, support rods are fixedly connected to the outer wall of the second steel ring body corresponding to the positions of the edge pressing strips, and the ends of the support rods are plug-in connected to the sockets provided in the edge pressing strips.

[0010] Furthermore, it also includes a grouting pipe with one end extending into the ring beam, which is used for grouting into the joints between the end shaft side wall and the ring beam and the joints between the ring beam and the shield tunnel segment.

[0011] Furthermore, the steel ring body is a circular tube, the inner wall of the circular tube is fixedly connected with the first steel ring body extending toward the center thereof, and both ends of the outer wall are fixedly connected with the second steel ring body extending away from the center thereof.

[0012] Furthermore, the steel ring body is a circular ring, the first steel ring body extending along the central axis direction is fixedly connected to the middle of one side of the circular ring, and the second steel ring body extending along the central axis direction is fixedly connected to both ends of the other side.

[0013] The present invention provides a method for constructing an interface between a shield tunnel and a subway station, using the above-mentioned waterproof sealing structure for the interface between a shield tunnel and a subway station, and the method comprises the following steps: Step 1: The waterproof structure is assembled on the second steel ring body using the clamping ring body, and the end of the support rod is inserted into the edge pressure strip; Step 2: pre-embed the second steel ring body installed in step 1 in the side wall of the end well of the subway station and in the side of the shield tunnel segment close to the ring beam; Step 3: Weld the first steel ring body on the steel ring body, and set water stop glue at the joints between the steel ring body and the pipe segment and the joints between the steel ring body and the side wall of the end well; Step 4: a grouting pipe is arranged in the ring beam for grouting into the joint between the end shaft side wall and the ring beam and for grouting into the joint between the ring beam and the pipe segment of the shield tunnel; Step 5: After the construction of the ring beam is completed, a stainless steel water trough is installed next to the joint between the ring beam and the shield tunnel segment.

[0014] In the above technical scheme, the present invention provides a waterproof sealing structure and construction method for the interface between a shield tunnel and a subway station, which has the following beneficial effects: The waterproof sealing structure of the interface between the shield tunnel and the subway station designed by the present invention is that the end of the shield tunnel is connected to the side wall of the end well through a ring beam, and the connection positions of the ring beam and the end well side wall, and the ring beam and the shield tunnel are all provided with water-stop steel rings; the first steel ring body of the water-stop steel ring can invade the ring beam, and the second steel ring body can invade the side wall of the end well and the shield tunnel; a flexible waterproof structure capable of stretching or contracting is provided on the side of the second steel ring body away from the steel ring body, and the waterproof structure is used to adapt to the displacement between the structures caused by the expansion, expansion, and settlement between the structures; one end of the waterproof structure is provided with a pressure edge strip pre-buried in the shield tunnel and the side wall of the end well, and the other end is provided with a clamping ring body capable of surrounding the second steel ring body, and the second steel ring body is circumferentially embraced by the clamping ring body, so that the water stop belt of the waterproof structure is in continuous and tight sealing contact with the second steel ring body, so as to avoid local water leakage and waterproof failure problems; the sealing structure has reliable sealing and good waterproof effect; The present invention discloses a construction method of a waterproof sealing structure at the interface between a shield tunnel and a subway station, which includes the above-mentioned waterproof sealing structure at the interface between a shield tunnel and a subway station, and therefore has the same beneficial effects, which will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a schematic diagram of the overall structure of the waterproof sealing structure of the interface between the shield tunnel and the subway station of the present invention; Figure 2 yes Figure 1 A partial enlarged view of point B; Figure 3 It is an axonometric diagram of the water-stop steel ring of the waterproof sealing structure at the interface between the shield tunnel and the subway station of the present invention; Figure 4 This is a front view of the water-stop steel ring of the waterproof sealing structure at the interface between the shield tunnel and the subway station of the present invention; Figure 5 yes Figure 4 AA section view; Figure 6 yes Figure 4 AA cross-sectional view of another embodiment; Figure 7 yes Figure 4 Cross-sectional view of water-stop steel rings used in shield tunnels and ring beams; Figure 8 It is a front view of the clamping ring body of the waterproof sealing structure at the interface between the shield tunnel and the subway station of the present invention.

[0017] Description of reference numerals: 1. Shield tunnel; 2. Side wall of end shaft; 3. Ring beam; 4. Waterstop steel ring; 401. Steel ring body; 402. First steel ring body; 403. Second steel ring body; 5. Waterproof structure; 501. Waterstop strip; 5011. Detour; 5012. Extension section; 5013. Folding section; 502. Edge pressure strip; 503. Clamping ring body; 5031. Spring; 6. Positioning ring; 601. Positioning groove; 7. Support rod; 8. Grouting pipe; 9. Stainless steel water receiving trough; 10. Waterstop glue. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0019] See also Figure 1 , 2 , as shown in 3; A waterproof sealing structure for the interface between a shield tunnel and a subway station is invented, comprising: a shield tunnel 1, a side wall of an end well 2, a ring beam 3, and a water-stop steel ring 4; The end of the shield tunnel 1 is connected to the end shaft side wall 2 through the ring beam 3, and the connection positions of the ring beam 3 and the end shaft side wall 2, as well as the ring beam 3 and the shield tunnel 1 are all provided with water-stop steel rings 4; The water stop steel ring 4 includes a steel ring body 401, a first steel ring body 402 and a second steel ring body 403; The first steel ring body 402 can penetrate into the ring beam 3, and the second steel ring body 403 can penetrate into the end shaft side wall 2 and the shield tunnel 1; The invention also includes a flexible waterproof structure 5 that can be stretched or contracted; One end of the waterproof structure 5 is provided with a pressure edge strip 502 pre-buried in the shield tunnel 1 and the end well side wall 2, and the other end is provided with a clamping ring body 503 capable of surrounding the second steel ring body 403. The clamping ring body 503 circumferentially surrounds the second steel ring body 403, so that the water stop strip 501 of the waterproof structure 5 is in continuous and tight sealing contact with the second steel ring body 403, thereby avoiding local water leakage and causing waterproof failure; See also Figure 8 As shown, in a preferred implementation, the snap ring body 503 is a retractable elastic snap ring, which includes a steel wire and at least one spring 5031. The steel wire and the spring 5031 are connected end to end to form a closed ring structure. The spring 5031 is used to provide contraction and expansion elastic force, thereby ensuring that the waterstop 501 of the waterproof structure 5 is in continuous and tight sealing contact with the second steel ring body 403.

[0020] Specifically, in the structure, a tension spring 5031 and a section of steel wire are taken as an example, and a hanging ring is bent at both ends of the steel wire, and a hook part is provided at both ends of the spring 5031. The spring 5031 hooks the steel wire hanging ring through the hook part. Under the action of the spring 5031 and the steel wire, the clamping ring body 503 has a certain elasticity, so that the spring 5031 provides a tightening force to make the water stop belt 501 of the waterproof structure 5 close to the surface of the second steel ring body 403, forming a tight sealing contact to ensure the sealing effect. Of course, the clamping ring body 503 may include multiple sections of steel wire, and two adjacent steel wires are connected by springs 5031, and multiple springs 5031 provide elastic force; In another preferred embodiment, the clamping ring body 503 is a steel wire or rope that can be wound around the second steel ring body 403 for at least two turns. The rope can be a corrosion-resistant non-metallic rope in the prior art. When assembling, the steel wire or rope is wound around the second steel ring body 403 for more than two turns, and the ends are fixedly connected in a knotted form to form a closed ring structure, which has a simple structure and is easy to assemble. See also Figure 3-5 As shown: Preferably, the waterproof structure 5 includes a water stop strip 501; A detour portion 5011 with an arc-shaped structure is formed at one end of the waterstop 501, and a joint is formed by the detour portion 5011. A straight extension section 5012 is formed at the other end, and the extension section 5012 extends to the inside of the shield tunnel 1 and the end shaft side wall 2 to form a pre-buried joint. A plurality of edge pressing strips 502 are evenly distributed circumferentially at the edge of the extension section 5012, and the edge pressing strips 502 provide pulling resistance for the waterstop 501. At least one folded portion 5013 is formed in the middle of the waterstop 501, and the folded portion 5013 can be an arc or other special-shaped structure. An extension margin is formed by the folded portion 5013 to extend the length of the waterproof structure 5, thereby adapting to structural expansion or The displacement between structures caused by shrinkage, settlement, etc. ensures the effectiveness of waterproofing at the interface. When displacement occurs, the edge strip 502 is used as the edge of the waterstop 501. The edge strip 502 is pre-buried in the end well side wall 2 or the shield tunnel 1 and moves synchronously with the end well side wall 2 and the shield tunnel 1. The other end of the waterstop 501 is connected to the waterstop steel ring 4, and the waterstop steel ring 4 moves synchronously with the ring beam 3. Therefore, under the pulling of the edge strip 502 and the waterstop steel ring 4, the folded part 5013 of the waterstop 501 is used to compensate for the shrinkage and expansion between the structures to achieve the purpose of waterproofing. In order to further ensure the expansion effect, the waterstop 501 can be folded radially in the circumferential direction with the center of the waterstop steel ring 4 as the center. See also Figure 6 As shown: In another preferred implementation, the water stop strip 501 may include more than two fold portions 5013 , thereby providing a greater extension amount for the waterproof structure 5 .

[0021] See also Figure 4 , 5 As shown: Preferably, the second steel ring body 403 is located on the side of the steel ring body 401 and is fixedly connected with a positioning ring 6. The positioning ring 6 is located at the end of the second steel ring body 403 and is formed with a positioning groove 601. The positioning groove 601 accommodates the detour portion 5011 and the clamping ring body 503, so that the second steel ring body 403 is fixedly connected to the waterproof structure 5. In order to further improve the waterproof effect, the positioning groove 601 is filled with a water-stopping glue. See also Figure 5 As shown: Preferably, the outer wall of the second steel ring body 403 corresponding to the position of the edge strip 502 is fixedly connected with a support rod 7, and the end of the support rod 7 is plug-in-pull connected with the jack provided in the edge strip 502, and the edge strip 502 is supported by the support rod 7, so that the water stop belt 501 has ribs, which is conducive to ensuring the uniformity of the shape of the water stop belt 501 at the outer edge of the second steel ring body 403; See also Figure 2 As shown: Preferably, the sealing structure further comprises a grouting pipe 8 with one end extending into the ring beam 3 for grouting into the joints between the end shaft side wall 2 and the ring beam 3 and into the joints between the ring beam 3 and the shield tunnel 1 segments.

[0022] See also Figure 4 , 5 As shown: Preferably, the steel ring body 401 is a circular tube, the inner wall of the circular tube is fixedly connected with a first steel ring body 402 extending toward the center of the circle, and both ends of the outer wall are fixedly connected with a second steel ring body 403 extending away from the center of the circle. The water-stop steel ring 4 in this structure is used in the end well side wall 2 and the ring beam 3; See also Figure 2 , 7 As shown: In another preferred embodiment, the steel ring body 401 is a circular ring with a flat plate structure, a first steel ring body 402 extending along the central axis of the circular ring is fixedly connected to the middle of one side of the circular ring, and a second steel ring body 403 extending along the central axis of the circular ring is fixedly connected to both ends of the other side. The water-stop steel ring 4 in this structure is used in the shield tunnel 1 and the ring beam 3: The present invention provides a method for constructing the interface between a shield tunnel and a subway station, using the waterproof sealing structure for the interface between the shield tunnel and the subway station, and the method comprises the following steps: Step 1: The waterproof structure 5 is assembled on the second steel ring body 403 using the clamping ring body 503, and the end of the support rod 7 is inserted into the edge pressing strip 502; Specifically, when the snap ring body 503 is a retractable elastic snap ring, the elastic snap ring forms a closed ring structure through a steel wire and at least one spring 5031. One end of the spring 5031 is first hooked with one end of the steel wire, and the other end of the steel wire is pulled to stretch the end of the spring 5031 to complete the hooking with the end of the steel wire, that is, the steel wire and the spring 5031 are connected end to end to form a closed ring structure.

[0023] When the clamping ring body 503 is a steel wire or rope, it is necessary to wrap the steel wire or rope around the second steel ring body 403 for more than two turns, and the ends are fixedly connected in a knotted form to form a closed ring structure to ensure sealing reliability; Step 2: pre-embed the second steel ring body 403 installed in step 1 in the end shaft side wall 2 of the subway station and in the side of the pipe segment of the shield tunnel 1 close to the ring beam 3. The steel ring body 401 of the water-stop steel ring 4 and the second steel ring body 403 are pre-embedded when the pipe segment is prefabricated; Step 3: Weld the first steel ring body 402 onto the steel ring body 401, and set a waterproof glue 10 at the joints between the steel ring body 401 and the pipe segment and at the joints between the steel ring body 401 and the side wall of the end well.

[0024] Step 4: a grouting pipe 8 is provided in the ring beam 3 for grouting into the joint between the end shaft side wall 2 and the ring beam 3 and for grouting into the joint between the ring beam 3 and the pipe segment of the shield tunnel 1; Step 5: After the construction of the ring beam 3 is completed, a stainless steel water receiving trough 9 is set next to the joint between the ring beam 3 and the pipe segment of the shield tunnel 1.

[0025] In the above technical scheme, the present invention provides a waterproof sealing structure and construction method for the interface between a shield tunnel and a subway station, which effectively solves the problem of waterproof failure at the interface caused by temperature differences, structural expansion or contraction, and displacement between structures caused by settlement, and has the beneficial effects of reliable sealing and good waterproofing.

[0026] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A waterproof sealing structure for the interface between a shield tunnel and a subway station, comprising: A shield tunnel (1), an end shaft side wall (2) connected to the end of the shield tunnel (1) through a ring beam (3), and a water-stop steel ring (4) arranged at the connection position between the ring beam (3) and the end shaft side wall (2) and the ring beam (3) and the shield tunnel (1), the water-stop steel ring (4) comprising a steel ring body (401) and a first steel ring body (402) arranged in the ring beam (3), and a second steel ring body (403) arranged in the end shaft side wall (2) and the shield tunnel (1), characterized in that: Also included is a flexible waterproof structure (5) capable of stretching or contracting; The waterproof structure (5) is provided with a pressure strip (502) pre-buried in the shield tunnel (1) and the end shaft side wall (2) at one end, and a clamping ring body (503) capable of surrounding the second steel ring body (403) is provided at the other end for circumferentially embracing the second steel ring body (403) so that the waterproof structure (5) and the second steel ring body (403) are in continuous and tightly sealed contact.

2. A waterproof sealing structure for the interface between a shield tunnel and a subway station according to claim 1, characterized in that: The snap ring body (503) is a retractable elastic snap ring, comprising a steel wire and at least one spring (5031); the steel wire and the spring (5031) are connected end to end to form a closed ring structure.

3. The waterproof sealing structure for the interface between a shield tunnel and a subway station according to claim 1, characterized in that: The clamping ring body (503) is a steel wire or rope that can be wound around the second steel ring body (403) at least twice.

4. The waterproof sealing structure for the interface between a shield tunnel and a subway station according to claim 1, characterized in that: The waterproof structure (5) comprises a waterstop strip (501), wherein a detour portion (5011) having an arc structure is formed at one end of the waterstop strip (501), and a straight extension section (5012) is formed at the other end, a plurality of edge pressure strips (502) are evenly distributed circumferentially at the edge of the extension section (5012), and at least one fold portion (5013) is formed in the middle of the waterstop strip (501).

5. The waterproof sealing structure for the interface between a shield tunnel and a subway station according to claim 4, characterized in that: The second steel ring body (403) is fixedly connected to a positioning ring (6) on the side of the steel ring body (401); the positioning ring (6) is formed with a positioning groove (601) at the end of the second steel ring body (403); the detour portion (5011) and the clamping ring body (503) are accommodated through the positioning groove (601).

6. A waterproof sealing structure for the interface between a shield tunnel and a subway station according to claim 4, characterized in that: The outer wall of the second steel ring body (403) is fixedly connected to a support rod (7) at a position corresponding to the edge pressing strip (502), and the end of the support rod (7) is plug-in-plug-connected to a socket provided in the edge pressing strip (502).

7. The waterproof sealing structure for the interface between a shield tunnel and a subway station according to claim 1, characterized in that: It also includes a grouting pipe (8) with one end extending into the ring beam (3) for grouting into the joint between the end shaft side wall (2) and the ring beam (3) and into the joint between the ring beam (3) and the shield tunnel (1) segment.

8. The waterproof sealing structure for the interface between a shield tunnel and a subway station according to claim 1, characterized in that: The steel ring body (401) is a circular tube, the inner wall of which is fixedly connected the first steel ring body (402) extending toward the center of the circle, and both ends of the outer wall of which are fixedly connected the second steel ring body (403) extending away from the center of the circle.

9. The waterproof sealing structure for the interface between a shield tunnel and a subway station according to claim 1, characterized in that: The steel ring body (401) is a circular ring, the first steel ring body (402) extending along the central axis direction of the circular ring is fixedly connected to the middle of one side of the circular ring, and the second steel ring body (403) extending along the central axis direction of the circular ring is fixedly connected to both ends of the other side.

10. A method for constructing the interface between a shield tunnel and a subway station, using the waterproof sealing structure for the interface between a shield tunnel and a subway station according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: Step 1: The waterproof structure (5) is assembled on the second steel ring body (403) using a clamping ring body (503), and the end of the support rod (7) is inserted into the edge pressure strip (502); Step 2: pre-embed the second steel ring body (403) assembled in step 1 in the side wall (2) of the end well of the subway station and in the side of the segment of the shield tunnel (1) close to the ring beam (3); Step 3: Welding the first steel ring body (402) onto the steel ring body (401), and providing a waterproof glue (10) at the joint between the steel ring body (401) and the pipe segment and at the joint between the steel ring body (401) and the end well side wall (2); Step 4: a grouting pipe (8) is provided in the ring beam (3) for grouting into the joint between the end shaft side wall (2) and the ring beam (3) and for grouting into the joint between the ring beam (3) and the pipe segment of the shield tunnel (1); Step 5: After the construction of the ring beam (3) is completed, a stainless steel water receiving trough (9) is provided next to the joint between the ring beam (3) and the pipe segment of the shield tunnel (1).

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