A subway station side wall inner advance pipe shed positioning structure

Abstract

The utility model belongs to the field of subway engineering technology discloses a kind of advanced pipe shed positioning structure in subway station side wall, including the annular reinforcing flange plate and annular base flange plate between enclosure pile and subway station side wall;Annular base flange plate is fixedly connected on the main reinforcement of enclosure pile, annular reinforcing flange plate fixedly connects annular base flange plate;Multiple guide pipes are embedded in subway station side wall, and multiple guide pipes are fixedly connected with annular reinforcing flange plate;Waterproof layer is laid between annular reinforcing flange plate and annular base flange plate;Water-stop steel ring is fixedly connected in the middle section position of guide pipe;In the side close to annular reinforcing flange plate, water-stop glue is applied in the welding place of guide pipe and water-stop steel ring.Using enclosure pile, annular base flange plate and annular reinforcing flange plate, guide pipe is embedded and positioned into subway station side wall;Water-stop steel ring and water-stop glue are set outside guide pipe, to avoid water from pipe shed guide pipe and the connection of subway station side wall penetration.

Description

Technical Field

[0001] This utility model belongs to the field of subway engineering technology, specifically relating to an advanced pipe shed positioning structure inside the side wall of a subway station. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] Currently, subway sections are usually constructed using the shield tunneling method, which consists of a single-bore, single-track tunnel. The shallow-buried tunnel connects to the station. When entering the tunnel, advanced pipe roof support is usually used. However, the pipe roof has a large diameter and a small circumferential spacing. During construction, it will damage the reinforcing steel of the retaining piles, reduce the bearing capacity of the retaining piles, and increase the risk of foundation pit instability.

[0004] To solve the above-mentioned technical problems, the prior art discloses a large pipe roof reinforcement system for the end of a shield tunnel based on the main structure, including the main structure of the shield tunnel, a shield launching portal reserved in the end wall of the shield tunnel, a pipe roof guide pipe pre-embedded in the end wall above the portal, and a large pipe roof being installed from inside the pipe roof guide pipe toward the shield tunnel.

[0005] The above scheme utilizes the end wall of the shield shaft's main structure as a guide wall to drive a large pipe roof towards the shield tunnel, thus avoiding the need to drive a pipe roof on the retaining piles.

[0006] However, in actual construction, some subway sections have parking lines built together with the main line. Due to the influence of the surrounding environment, shallow buried tunneling is generally used. When the shallow buried tunnel connects to the station, the tunnel usually has a pre-construction pipe roof installed before the retaining wall construction and the station side wall are poured. In this case, the end wall of the shield shaft main structure cannot be used as a guide wall. Moreover, the above solution only sets polyurethane sealant in the gap between the pipe roof guide pipe and the main pipe roof, which cannot prevent water from seeping from the connection between the pipe roof guide pipe and the shield shaft end wall. Utility Model Content

[0007] In view of this, the purpose of this utility model is to provide an advanced pipe roof positioning structure inside the side wall of a subway station, which can solve the technical problems in the prior art where the end wall of the shield shaft main structure cannot be used as a guide wall when the shallow buried tunnel is connected to the station, and the prior art cannot prevent water from seeping from the connection between the pipe roof guide pipe and the shield shaft end wall.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A pre-installed pipe roof positioning structure is provided in the side wall of a subway station, including a circumferential reinforcing flange and a circumferential base flange disposed between the retaining pile and the side wall of the subway station; the circumferential base flange is fixedly connected to the main reinforcement of the retaining pile, and the circumferential reinforcing flange is fixedly connected to the circumferential base flange. Multiple guide pipes are pre-embedded in the side wall of the subway station, and the multiple guide pipes are fixedly connected to the circumferential reinforcing flange; A waterproof layer for the station side wall is laid between the circumferential reinforcing flange and the circumferential base flange; A water-stop steel ring is fixedly connected in the middle section of the guide pipe; on the side near the circumferential reinforcing flange, water-stop adhesive is applied to the weld between the guide pipe and the water-stop steel ring, and the advanced pipe shed is installed into the stratum through the guide pipe.

[0009] Preferably, the circumferential base flange and the circumferential reinforcing flange are the same size and shape, and both are treated with rust and corrosion prevention.

[0010] Preferably, both the upper and lower edges of the circumferential reinforcing flange and the circumferential base flange are provided with a row of bolt positioning holes.

[0011] Preferably, a row of guide tube positioning holes is provided in the middle of the disc surface of both the circumferential reinforcing flange and the circumferential base flange.

[0012] Preferably, the inner diameter of the guide tube positioning hole is equal to the outer diameter of the guide tube.

[0013] Preferably, the guide tube and the guide tube positioning hole on the circumferential reinforcing flange are welded and fixed by means of a closed waterproof fillet weld.

[0014] Preferably, the length of the guide tube plus the thickness of the circumferential reinforcing flange is equal to the thickness of the subway station side wall, and circumferential reinforcing ribs are provided on the outside of the guide tube.

[0015] Preferably, the guide tube is backfilled with micro-expansion cement mortar and compacted, and the guide tube is sealed with a sealing steel plate by a water-impermeable welding method.

[0016] Preferably, the guide tube is made of seamless steel pipe, and its inner diameter is larger than the outer diameter of the advanced pipe shed.

[0017] Preferably, an interface agent is applied to the soil-facing side of the circumferential base flange facing the retaining pile, so that it adheres closely to the cement mortar surface of the retaining pile.

[0018] Compared with the prior art, the advantages and positive effects of this utility model are: This invention employs a circumferential base flange for positioning on the retaining piles, and a circumferential reinforcing flange for fixing to the guide pipe. The guide pipe is pre-embedded within the side wall of the subway station by connecting the circumferential base flange and the circumferential reinforcing flange, using the subway station as a guide wall. This solves the technical problem in existing shallow-buried tunnels connected to stations where the end wall of the shield shaft structure cannot be used as a guide wall. Pre-embedding the guide pipe within the subway station side wall ensures the accuracy of the advanced pipe roof installation and allows for installation after the station side wall construction is completed, reducing the risk of foundation pit instability. Furthermore, the end of the advanced pipe roof is cast within the side wall, providing strong support and reducing the risks associated with tunnel construction. This invention also includes a water-stop steel ring and water-stop sealant on the outside of the guide pipe to prevent water seepage from the connection between the pipe roof guide pipe and the subway station side wall. Attached Figure Description

[0019] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0020] Figure 1 This is a cross-sectional view of the advanced pipe shed positioning device according to an embodiment of this utility model; Figure 2 This is an elevation view of the station side wall positioning device according to an embodiment of the present utility model; In the picture: 1. Retaining piles; 2. Circumferential base flange; 3. Station side wall waterproofing layer; 4. Circumferential reinforcing flange; 5. Guide pipe; 6. Water-stop steel ring; 7. Bolts; 8. Water-stop adhesive; 9. Circumferential reinforcing ribs; 10. Subway station side wall; 11. Advanced pipe shed; 12. Micro-expansion cement mortar; 13. Sealing steel plate. Detailed Implementation

[0021] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0022] The present invention will now be described in detail with reference to the accompanying drawings. This embodiment discloses an advanced pipe roof positioning structure inside the side wall of a subway station, such as... Figure 1 As shown, it includes a circumferential reinforcing flange 4 and a circumferential base flange 2 installed between the retaining pile 1 and the subway station side wall 10. The circumferential reinforcing flange 4 and the circumferential base flange 2 are fixedly connected by bolts 7.

[0023] like Figure 1As shown, the circumferential base flange 2 is installed inside the retaining pile 1. Specifically, after the subway station's foundation slab is completed and construction of the subway station's side walls begins, the retaining pile 1 is first positioned according to the guide pipe positioning holes on the circumferential base flange 2. Then, the concrete protective layer on one side of the retaining pile 1 where the circumferential base flange 2 needs to be installed is removed to expose the main reinforcement of the retaining pile. It can be understood that the concrete protective layer is the concrete covering the area from the outer edge of the reinforcing steel bars to the surface of the structural member, used to protect the reinforcing steel bars. After verifying the positioning, the circumferential base flange 2 is then welded and fixed to the main reinforcement of the retaining pile.

[0024] like Figure 1 As shown, multiple guide pipes 5 are pre-embedded in the side wall 10 of the subway station, and the circumferential reinforcing flange 4 is fixedly connected to the guide pipes 5. It can be understood that in this embodiment, by fixing the circumferential base flange 2 to the main reinforcement of the retaining pile 1, and fixing the circumferential reinforcing flange 4 to the circumferential base flange 2, a positioning support function can be provided for the installation of the guide pipes 5. Because the side wall 10 of the subway station is a cast-in-place structure, if the guide pipes 5 are only tied to the reinforcing cage of the side wall 10, the flow of concrete or vibration operations during pouring may affect the position of the guide pipes 5. However, in this embodiment, the guide pipes 5 are fixedly connected to the circumferential reinforcing flange 4, and the circumferential reinforcing flange 4 is fixedly connected to the circumferential base flange 2. During the pouring of the side wall of the subway station, the retaining pile 1 can support the guide pipes 5, preventing changes in the position of the guide pipes 5.

[0025] like Figure 1 As shown, a station side wall waterproof layer 3 is also installed between the circumferential base flange 2 and the circumferential reinforcing flange 4. It should be noted that the station side wall waterproof layer 3 has holes of the same size at the reserved bolt positioning holes and guide pipe positioning holes; the station side wall waterproof layer 3 is fixed to the circumferential base flange 2 and the circumferential reinforcing flange 4 using double-sided adhesive tape. The circumferential base flange 2 and the circumferential reinforcing flange 4 serve two purposes: firstly, they fix the waterproof layer; secondly, after the circumferential base flange 2 and the circumferential reinforcing flange 4 are clamped together, they also work together with the waterproof layer to provide a certain degree of waterproofing.

[0026] like Figure 1 As shown, a water-stop steel ring 6 is welded and installed in the middle section of the guide pipe 5; on the side near the circumferential reinforcing flange 4, water-stop adhesive 8 is applied to the weld between the guide pipe 5 and the water-stop steel ring 6. To ensure welding quality and reduce on-site welding work, this part of the work is completed in the factory.

[0027] like Figure 1 , Figure 2As shown, the circumferential base flange 2 and the circumferential reinforcing flange 4 are identical in size and shape, both being arc-shaped flanges, and both flanges require rust and corrosion prevention treatment. In this embodiment, groundwater may seep from the retaining piles 1 into the subway station side wall 10, where it is blocked at the water-stop steel ring 6. Therefore, the circumferential base flange 2 and the circumferential reinforcing flange 4 are at risk of corrosion by groundwater, and both flanges require rust and corrosion prevention treatment.

[0028] like Figure 1 , Figure 2 As shown, a row of bolt positioning holes is provided on the upper and lower edges of both the circumferential base flange 2 and the circumferential reinforcing flange 4. The bolt positioning holes are internally threaded and used to mate with bolts 7. It can be understood that by providing bolt positioning holes on both the upper and lower edges of the circumferential base flange 2 and the circumferential reinforcing flange 4, the two flanges can be securely connected.

[0029] like Figure 1 , Figure 2 As shown, a row of guide tube positioning holes is provided in the middle of the disc surface of both the circumferential reinforcing flange 4 and the circumferential base flange 2. The inner diameter of the guide tube positioning holes is equal to the outer diameter of the guide tube 5. After the guide tube 5 is inserted into the guide tube positioning hole of the circumferential reinforcing flange 4, it is fixedly connected to the guide tube positioning hole of the circumferential reinforcing flange 4.

[0030] Specifically, in this embodiment, the guide pipe 5 is welded and fixed to the guide pipe positioning hole of the circumferential reinforcing flange 4 using a closed, impermeable fillet weld connection. It is understood that the purpose of this connection method is to utilize the circumferential reinforcing flange 4 as a waterproof structure. The closed, impermeable fillet weld connection between the guide pipe 5 and the circumferential reinforcing flange 4 reduces the possibility of groundwater seepage.

[0031] like Figure 1 As shown, the sum of the length of the guide pipe 5 and the thickness of the circumferential reinforcing flange 4 is equal to the thickness of the subway station side wall 10. Since the guide pipe 5 is embedded inside the subway station side wall 10, a circumferential reinforcing rib 9 is set on the outside of the guide pipe 5 to reinforce the position of the guide pipe 5 and ensure that the subway station side wall 10 can stably support the guide pipe 5 and the driven advanced pipe roof 11.

[0032] like Figure 1 As shown, after the station structure construction is completed, the advanced pipe shed 11 is installed into the ground through the guide pipe 5 reserved inside the subway station side wall 10. Grouting is then carried out into the ground outside the retaining pile 1 through the advanced pipe shed 11. After the advanced pipe shed 11 has completed the grouting of the ground, the guide pipe 5 is backfilled and compacted with micro-expansion cement mortar 12. Then, the sealing steel plate 13 is welded to the guide pipe 5 by waterproof welding to seal the joint and ensure the waterproof quality of the joint.

[0033] It should be noted that in this embodiment, the guide pipe 5 is made of seamless steel pipe, with an inner diameter slightly larger than the outer diameter of the advanced pipe shed 11 by 20-30mm, which can meet the requirement that the advanced pipe shed be installed at an angle of ≤2 degrees. The guide pipe is pre-embedded at the corresponding position of the advanced pipe shed during the pouring of the station side wall, and the installation accuracy of the advanced pipe shed can be effectively guaranteed by the guide pipe.

[0034] It should also be noted that an interface agent should be applied to the soil-facing side of the circumferential base flange 2 facing the retaining pile 1 to ensure close adhesion with the cement mortar on the surface of the retaining pile 1.

[0035] Specifically, the construction steps are as follows: Both the circumferential base flange 2 and the circumferential reinforcing flange 4 are prefabricated in the factory. The connection between the circumferential reinforcing flange 4 and the guide pipe 5 and the water-stop steel ring 6 is also prefabricated in the factory.

[0036] When the construction of the subway station base slab is completed and the construction of the side walls begins, the position of the advanced pipe shed 11 is located on the retaining pile 1, and the position of the circumferential base flange 2 to be installed is determined. Then, the concrete protective layer of the retaining pile 1 corresponding to the circumferential base flange 2 is removed to expose the main reinforcement of the retaining pile. Apply an interface agent to the side of the circumferential base flange 2 facing the retaining pile 1, and weld and fix the circumferential base flange 2 to the main reinforcement of the retaining pile, and adjust the verticality of the circumferential base flange 2; then lay the station side wall waterproof layer 3 on the circumferential base flange 2. The circumferential reinforcing flange 4, to which the guide tube 5 has been welded, is connected and fixed to the circumferential base flange 2 by bolts 7, and the levelness of the guide tube 5 is verified. Next, tie the 10 steel bars and 9 circumferential reinforcing bars of the subway station side wall, and apply water-stop adhesive 8 to the welding point of the guide pipe 5 and the water-stop steel ring 6 on the side facing the circumferential reinforcing flange 4. Check the levelness of the guide pipe 5; then pour the concrete for the side wall 10 of the subway station to complete the pre-embedding of the guide pipe 5; An advanced pipe roof 11 is installed into the stratum through a guide pipe and retaining piles. Then, the advanced pipe roof 11 is used to reinforce the stratum by grouting. After the grouting reinforcement is completed, micro-expansion cement mortar 12 is backfilled into the guide pipe 5, and the guide pipe 5 is sealed with a sealing steel plate 13 by a water-impermeable welding method.

[0037] Through the above measures, the pre-installed pipe roof is driven into the already constructed station sidewall. Even if the retaining piles are damaged, the lateral water and soil pressure from the ground can be borne by the station sidewall structure, significantly improving the safety of the foundation pit. The end of the pre-installed pipe roof is embedded in the station sidewall, resulting in more reasonable stress distribution during tunnel entry and safer tunnel excavation. The pre-installed guide pipes ensure the accuracy of long-distance installation of the pre-installed pipe roof, meeting the construction accuracy requirements for pipe roofs 30–50 meters long.

[0038] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A pre-positioning structure for the inner wall of a subway station, characterized in that, It includes a circumferential reinforcing flange and a circumferential base flange disposed between the retaining pile and the side wall of the subway station; the circumferential base flange is fixedly connected to the main reinforcement of the retaining pile, and the circumferential reinforcing flange is fixedly connected to the circumferential base flange; Multiple guide pipes are pre-embedded in the side wall of the subway station, and the multiple guide pipes are fixedly connected to the circumferential reinforcing flange. A waterproof layer for the station side wall is laid between the circumferential reinforcing flange and the circumferential base flange; A water-stop steel ring is fixedly connected at the middle section of the guide pipe; on the side near the reinforcing flange of the ring, water-stop adhesive is applied at the welding point between the guide pipe and the water-stop steel ring, and the advanced pipe shed is installed into the stratum through the guide pipe.

2. The advanced pipe roof positioning structure inside the side wall of a subway station as described in claim 1, characterized in that, The circumferential base flange and the circumferential reinforcing flange are the same size and shape, and both are treated with rust and corrosion prevention.

3. The advanced pipe roof positioning structure inside the side wall of a subway station as described in claim 1, characterized in that, Both the upper and lower edges of the circumferential reinforcing flange and the circumferential base flange are provided with a row of bolt positioning holes.

4. The advanced pipe roof positioning structure inside the side wall of a subway station as described in claim 1, characterized in that, A row of guide tube positioning holes is provided in the middle of the disc surface of both the circumferential reinforcing flange and the circumferential base flange.

5. The advanced pipe roof positioning structure inside the side wall of a subway station as described in claim 4, characterized in that, The inner diameter of the guide tube positioning hole is equal to the outer diameter of the guide tube.

6. The advanced pipe roof positioning structure inside the side wall of a subway station as described in claim 4, characterized in that, The guide tube and the guide tube positioning hole on the circumferential reinforcing flange are welded and fixed by means of a closed, impermeable fillet weld.

7. The advanced pipe roof positioning structure inside the side wall of a subway station as described in claim 1, characterized in that, The length of the guide tube plus the thickness of the circumferential reinforcing flange is equal to the thickness of the subway station side wall, and circumferential reinforcing ribs are provided on the outside of the guide tube.

8. The advanced pipe roof positioning structure inside the side wall of a subway station as described in claim 1, characterized in that, The guide tube is backfilled with micro-expansion cement mortar and compacted, and the guide tube is sealed with a sealing steel plate by a water-impermeable welding method.

9. The advanced pipe roof positioning structure inside the side wall of a subway station as described in claim 1, characterized in that, The guide tube is made of seamless steel pipe, and its inner diameter is larger than the outer diameter of the advanced pipe shed.

10. The advanced pipe roof positioning structure inside the side wall of a subway station as described in claim 1, characterized in that, The circumferential base flange is coated with an interface agent on the soil-facing side facing the retaining pile, so that it adheres closely to the cement mortar surface of the retaining pile.

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