Connection structure of subway station and tunnel and construction method

Abstract

The present application relates to the technical field of subway tunnel construction, in particular to a connecting structure of a subway station and a tunnel and a subway station construction method. The connecting structure comprises an intermediate connecting plate and annular connecting plates arranged on both sides of the intermediate connecting plate; the intermediate connecting plate and the annular connecting plates are connected by steel pipe columns; the annular connecting plates are further detachably connected with the pipe segments. The connecting structure of the present application adopts high-strength bolts, annular connecting plates and steel pipe columns to form a connecting structure with high integrity, which can effectively inhibit the pipe segment misalignment. At the same time, the construction has high standardization and fast assembly speed, and through the forced alignment mechanism of the annular connecting plate mounting hole, the problem of difficult to guarantee the geometric precision in construction is solved. The subway station construction method of the present application adopts the construction sequence of station first, tunnel second and station third, which guarantees the continuity of station construction and shield construction and speeds up the construction speed; and further controls the settlement of the station hall initial support and inhibits the pipe segment misalignment by combining with the connecting structure.

Description

Technical Field

[0001] This invention relates to the field of tunnel construction technology, and more specifically, to a connection structure and construction method for a subway station and a tunnel. Background Technology

[0002] In the construction of urban subways, the shield tunneling method is commonly used for rail transit sections, while the construction methods for subway stations vary. In the initial stages of construction, the primary method was "station first, tunnel later." However, this method resulted in poor continuity of tunneling because the shield could only be excavated after the station construction was completed, thus affecting the construction schedule of the tunnel section. Currently, a "tunnel first, station later" method is also used, where the shield passes through the station area before the subway station is built. While this method ensures the continuity of shield construction, the station cannot be built until the shield has passed through, which in turn impacts the station's construction schedule. Therefore, neither of these methods effectively resolves the conflict between the station construction and shield construction schedules.

[0003] Furthermore, during construction, the temporary shield tunnel segments within the station end area and the tunnel section segments differ in diameter. Existing connection methods primarily employ either transitional segments or flexible connections using rubber pads. However, transitional segments suffer from lower overall stiffness and flexural bearing capacity due to geometric discontinuities in the transition section. They also require custom-made transitional segments, are complex and time-consuming to assemble, and their geometric accuracy is difficult to guarantee. When passing under structures, deformation coordination in the transition section may amplify settlement effects, hindering settlement control in sensitive environments. Flexible connections using rubber pads have low bearing capacity, allow for significant deformation, and rely on rubber pad deformation compensation during assembly. Accuracy depends on construction experience, and repeated adjustments to deformation coordination reduce construction speed.

[0004] Therefore, there is an urgent need to provide a subway station construction method that can resolve the conflict between the construction schedule of the station and the tunnel boring machine, as well as a connection structure between the subway station and the tunnel that is stronger and easier to construct. Summary of the Invention

[0005] To overcome the shortcomings of the existing technology, this invention provides a connection structure and construction method for subway stations and tunnels. To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A connection structure for a subway station and a tunnel includes an intermediate connecting plate and annular connecting plates disposed on both sides of the intermediate connecting plate; the intermediate connecting plate and the annular connecting plates are welded together by multiple steel pipe columns; one side of the annular connecting plate is detachably connected to the tunnel segment, and the other side of the annular connecting plate is detachably connected to the station segment; wherein, the annular connecting plate is an annular plate-shaped member used for docking with the segment; the intermediate connecting plate is an annular plate-shaped member used for connecting the two annular connecting plates; the steel pipe columns are tubular columns used for transmitting loads.

[0006] The steel pipe columns are evenly distributed along the circumference of the annular connecting plate.

[0007] One end of the steel pipe column is connected to the intermediate connecting plate by a perimeter weld, and the other end is connected to the annular connecting plate by a perimeter weld; wherein, the perimeter weld is a circumferential weld to form a continuous weld.

[0008] The annular connecting plate, tunnel segment, and station segment are all provided with multiple mounting holes for detachable connection by bolts.

[0009] One end of the bolt is welded and fixed to the annular connecting plate.

[0010] Both the intermediate connecting plate and the annular connecting plate are annular steel plates.

[0011] A subway station construction method includes the following steps: Step 1: Excavate the left guide tunnel of the arch of the station hall and construct the first and second layers of initial support; Step 2: Excavate the central guide tunnel in the arch of the station hall, and construct the first and second layers of initial support; Step 3: Excavate the right guide tunnel of the arch of the station hall and construct the first and second layers of initial support; Step 4: When the tunnel boring machine reaches the end of the station, the tunnel segment and the station segment are connected. Step 5: Conduct shield tunneling construction on the platform level, including the upper platform, the middle platform, and the lower platform. Step Six: Remove the temporary supports in the middle of the station hall level; Step 7: Excavate the platform layer and construct the initial support.

[0012] The connection process in step four includes: pre-drilling multiple mounting holes at corresponding positions of tunnel segments, station segments, and annular connecting plates; welding bolts to the mounting hole walls of the annular connecting plates; installing an intermediate connecting plate between two annular connecting plates; welding the intermediate connecting plate to the annular connecting plates using steel pipe columns; and welding bolts to the intermediate connecting plates.

[0013] The location of the mounting holes is determined based on bending stress verification to ensure that the bending stress of the annular connecting plate does not exceed the maximum allowable value.

[0014] The number of mounting holes is determined based on the bending bearing capacity of the annular connecting plate and the maximum allowable tensile force of the bolts.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The annular connecting plate on one side is also detachably connected to the tunnel segment, and the annular connecting plate on the other side is also detachably connected to the station segment. Through the connection structure of this invention, using high-strength bolts, annular connecting plates, and steel pipe columns, a highly integrated connection structure is formed, which can effectively suppress segment misalignment.

[0016] The construction of high-strength bolts, ring connecting plates, and steel pipe column connections is highly standardized and quick to assemble. The connection structure is simple, the stress at the nodes is clearly defined, and it is easy to install sensors, strain gauges, etc. to monitor key parameters such as bolt preload, contact pressure, and joint deformation in real time, further ensuring the safety of the structure.

[0017] Furthermore, the forced alignment mechanism of the mounting holes in the annular connecting plate can precisely control the posture of the tunnel segments, solving the problem of difficulty in ensuring geometric accuracy during construction.

[0018] The construction sequence of station construction followed by tunnel construction and then station construction effectively resolved the conflict between the schedules of shield tunneling and station construction in traditional technologies. This ensured the continuity of both station and shield tunneling operations, accelerated the construction speed, and significantly reduced the project's construction cycle. Furthermore, by incorporating the connection structure provided by this invention, the settlement of the initial support structure of the station hall level was further controlled, and segment misalignment was suppressed, significantly contributing to ensuring structural safety. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the connection structure between a subway station and a tunnel in an embodiment of the present invention; Figure 2 This is a schematic diagram of the annular connecting plate connected to the station area tunnel segment in an embodiment of the present invention; Figure 3 This is a schematic diagram showing the station after construction is completed according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the station before construction is completed according to an embodiment of the present invention.

[0020] Among them, 1. Left guide tunnel of the arch of the station hall; 2. Middle guide tunnel of the arch of the station hall; 3. Right guide tunnel of the arch of the station hall; 4. Upper step of the platform level; 5. Middle step of the platform level; 6. Lower step of the platform level; 7. Segment of the station area; 8. Segment of the tunnel section; 9. Annular connecting plate; 10. Intermediate connecting plate; 11. Steel pipe column; 12. Installation hole; a. First layer of initial support; b. Second layer of initial support; c. Intermediate temporary support; d. Locking anchor; e. Anchor; f. Secondary lining; g. Middle plate. Detailed Implementation

[0021] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0022] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0023] like Figure 1-2 The diagram illustrates a connection structure between a subway station and a tunnel. The left side of the diagram shows a station section segment 7 with an outer diameter of 6.0m and an inner diameter of 5.4m, while the right side shows a tunnel section segment 8 with an outer diameter of 6.2m and an inner diameter of 5.5m. The structure includes an intermediate connecting plate 10 and annular connecting plates 9 positioned on either side of the intermediate connecting plate. Both the intermediate connecting plate and the annular connecting plates are preferably made of steel. The intermediate connecting plate and the annular connecting plates are welded together via steel pipe columns 11. One side of the annular connecting plate is detachably connected to the tunnel section segment 8 (preferably bolted), and the other side of the annular connecting plate is also detachably connected to the station section segment 7.

[0024] The opening positions of the tunnel segments and their connecting ring plates are 190mm from the inner diameter of the segments and 240mm from the inner diameter of the ring plates, respectively. The opening positions of the station area segments and their connecting ring plates are 120mm from the inner diameter of the segments and 120mm from the inner diameter of the ring plates, respectively.

[0025] The steel pipe column is provided in multiple units, and the multiple steel pipe columns are evenly distributed along the circumference of the annular connecting plate. One end of the steel pipe column is connected to the intermediate connecting plate by a perimeter weld, and the other end is connected to the annular connecting plate by a perimeter weld.

[0026] Multiple mounting holes 12 are pre-set at corresponding positions of the tube segment and the annular connecting plate, and the mounting holes are matched with bolts.

[0027] The detachable connection is made by a combination of bolts and nuts; one end of the bolt is welded and fixed to the annular connecting plate.

[0028] Both the intermediate connecting plate and the annular connecting plate are annular plates of the same specifications. See Figure 3 and Figure 4 The subway station construction method of this embodiment adopts the connection structure described above and includes the following steps: Step 1: Excavate the left guide tunnel 1 of the arch of the station hall, and install wire mesh, erect the first and second layer steel frames, erect the intermediate temporary support c, install anchor bolts e and end locking anchor bolts d, and construct the first layer initial support a and the second layer initial support b. Step 2: Excavate the central guide tunnel 2 in the arch of the station hall, and install wire mesh, erect the first and second layer steel frames, erect the intermediate temporary supports, install anchor bolts, and construct the first and second layer initial support. Step 3: Excavate the right guide tunnel 3 of the arch of the station hall, and install wire mesh, erect the first and second layer steel frames, install anchor bolts and end locking anchor bolts, and construct the first and second layer initial support. The excavation interval between adjacent left and right guide tunnels of the arch shall not be less than 15m, and the interval between the first and second layers of initial support shall be 3-5m. The first and second layers of initial support are obtained by constructing the first and second layers of initial support.

[0029] It also includes the upper step 4 of the construction platform level, the middle step 5 of the platform level, and the lower step 6 of the platform level; Step 4: The tunnel boring machine (TBM) is advanced to the end of the station and the tunnel segments are connected to the station area segments. Since the effectiveness of interface treatment directly affects whether the initial support of the station concourse will experience significant settlement, thus impacting the overall structural safety of the station, the following method is used to address the interface treatment of tunnel segments with different diameters and to connect them to the station area segments: Multiple mounting holes are prefabricated circumferentially at corresponding positions of tunnel segments, station segments, and annular connecting plates; the positions of the mounting holes are calculated according to the following method: The positions of the mounting holes on the annular connecting plate that connects to the tunnel segments are determined by the bending stress check formula, as follows: ; in: For the bending stress of the annular connecting plate, The bending moment under the action of the bolt. Let D be the section modulus of the annular connecting plate, and D be twice the distance from the mounting hole to the center of the annular connecting plate. d is the inner diameter of the annular connecting plate, which is 5400 mm in this embodiment; Establish The relational expression is used to find D. The maximum allowable bending stress of the annular connecting plate is used to determine the location of the mounting holes on the annular connecting plate that connects to the tunnel segment. The number of mounting holes is determined by the bending bearing capacity of the annular connecting plate, as shown in the following expression: ; in: Number of mounting holes This is the maximum allowable tensile force for the bolt.

[0030] By employing the above technical solution, the distribution of mounting holes on one of the annular connecting plates can be obtained by calculating the number and location of the mounting holes. This confirms the consistency of the mounting hole distribution on the intermediate connecting plate and the other connecting plate, thus determining the corresponding steel pipe columns. The uniformly distributed mounting holes ensure a symmetrical annular stress distribution on the contact surface of the annular connecting plate, avoiding localized stress concentration. Furthermore, the uniformly distributed bolt group forms a stable moment resistance ring, with each bolt bearing essentially the same stress. Simultaneously, the uniformly distributed mounting holes ensure assembly accuracy through forced alignment, reducing manual adjustment time and accelerating construction speed.

[0031] Weld the bolts to the walls of the mounting holes on the annular connecting plate; Install an intermediate connecting plate of the same specification between the two annular connecting plates; The intermediate connecting plate and the annular connecting plate are welded together using steel pipe columns; the spacing between the steel pipe columns is less than 8 times the difference between the inner and outer diameters of the annular connecting plate. The annular connecting plate has an outer radius of 3250 mm and an inner radius of 2700 mm, meaning the difference between its inner and outer diameters is 550 mm. The spacing between the columns can then be determined using this method.

[0032] Weld the bolts to the intermediate connecting plate.

[0033] In this embodiment, 10 mounting holes are evenly arranged at the same positions between the tunnel segment and the annular connecting plate, and between the station segment and the annular connecting plate, with an angle of 36° between the holes. Between the annular connecting plate and the intermediate connecting plate on the station segment side, and between the annular connecting plate and the intermediate connecting plate on the tunnel segment side, 18 steel pipe columns are evenly arranged, with an angle of 20° between the columns. The steel pipe columns have an outer diameter of 250mm, a thickness of 8mm, and a single length of 15cm. They are connected to the three annular connecting plates by a welded connection, with a weld height of 10mm.

[0034] By uniformly distributing annular stiffening ribs in the steel pipe columns, the overall stiffness of the annular connecting plate is significantly improved. Furthermore, the steel pipe columns and the annular connecting plate are welded together to form a rigid node, enhancing the load-bearing capacity. Simultaneously, the steel pipe columns uniformly transfer the load to the annular connecting plate, optimizing stress distribution and effectively resolving stress concentration issues.

[0035] Step 5: Shield tunneling construction at the platform level; Step 6: Remove the temporary supports in the middle of the station hall; the distance between adjacent temporary supports to be removed shall not be less than 3m; Step 7: Excavate the platform layer, dividing it longitudinally into several construction sections, excavating from top to bottom and promptly constructing initial support. Step 8: Construct the secondary lining f and the intermediate slab g.

[0036] The above description only illustrates the preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention, and all such changes should be included within the protection scope of the present invention.

Claims

1. A connection structure between a subway station and a tunnel, characterized in that: It includes an intermediate connecting plate (10) and annular connecting plates (9) disposed on both sides of the intermediate connecting plate (10); the intermediate connecting plate (10) and the annular connecting plate (9) are welded together by multiple steel pipe columns (11); one side of the annular connecting plate (9) is detachably connected to the tunnel section segment (8), and the other side of the annular connecting plate (9) is detachably connected to the station section segment (7); wherein, the annular connecting plate (9) is an annular plate-shaped component used to dock with the segment; the intermediate connecting plate (10) is an annular plate-shaped component used to connect the two annular connecting plates (9); the steel pipe column (11) is a tubular column used to transfer loads; The annular connecting plate (9), the tunnel section segment (8) and the station section segment (7) are all provided with multiple mounting holes (12) for detachable connection by bolts; One end of the bolt is welded and fixed to the annular connecting plate (9).

2. The connection structure between a subway station and a tunnel according to claim 1, characterized in that: The steel pipe columns (11) are evenly distributed along the circumference of the annular connecting plate (9).

3. The connection structure between a subway station and a tunnel according to claim 2, characterized in that: One end of the steel pipe column (11) is connected to the intermediate connecting plate (10) by a surrounding weld, and the other end is connected to the annular connecting plate (9) by a surrounding weld; wherein the surrounding weld is a circumferential weld to form a continuous weld.

4. The connection structure between a subway station and a tunnel according to claim 1, characterized in that: Both the intermediate connecting plate (10) and the annular connecting plate (9) are annular steel plates.

5. A method for constructing a subway station, characterized in that, Using the connection structure as described in any one of claims 1-4 includes the following steps: Step 1: Excavate the left guide tunnel (1) of the arch of the station hall, and construct the first layer of initial support (a) and the second layer of initial support (b). Step 2: Excavate the central guide tunnel (2) of the arch of the station hall, and construct the first layer of initial support (a) and the second layer of initial support (b). Step 3: Excavate the right guide tunnel (3) of the arch of the station hall, and construct the first layer of initial support (a) and the second layer of initial support (b). Step 4: When the shield tunnel reaches the end of the station, the tunnel section segments (8) and the station area segments (7) are connected. Step 5: Carry out shield tunneling construction on the platform level, including the upper platform level (4), the middle platform level (5), and the lower platform level (6). Step 6: Remove the temporary supports in the middle of the station hall (c); Step 7: Excavate the platform layer and construct the initial support.

6. A subway station construction method according to claim 5, characterized in that: The connection process in step four includes: pre-drilling multiple mounting holes (12) at corresponding positions of the tunnel section segment (8), the station section segment (7), and the annular connecting plate (9); welding bolts to the wall of the mounting hole (12) of the annular connecting plate (9); installing an intermediate connecting plate (10) between two annular connecting plates (9); welding the intermediate connecting plate (10) to the annular connecting plate (9) through a steel pipe column (11); and welding bolts to the intermediate connecting plate (10).

7. A subway station construction method according to claim 6, characterized in that: The position of the mounting hole (12) is determined based on the bending stress check to ensure that the bending stress of the annular connecting plate (9) does not exceed the maximum allowable value.

8. A subway station construction method according to claim 6, characterized in that: The number of mounting holes (12) is determined based on the bending bearing capacity of the annular connecting plate (9) and the maximum allowable tensile force of the bolts.

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