A construction method for reducing the settlement of structures at both ends of a subway corridor

Abstract

The present invention relates to a construction method for reducing structural settlement at both ends of a subway tunnel spanning a tunnel, comprising the following specific steps: Step 1: Construction of a foundation; Step 2: Construction of a slab; Step 3: Construction of the tunnel floor spanning the tunnel; Step 4: Construction of the tunnel foundation for a standard tunnel section; Step 5: Construction of a standard tunnel section cushion layer; and Step 6: Construction of the tunnel floor for a standard tunnel section. The present invention effectively reduces uneven settlement at construction joints and ensures waterproofing of expansion joints.

Description

Technical Field

[0001] The present invention relates to the technical field of municipal engineering, and in particular to a construction method for reducing the settlement of structures at both ends of an overpass subway pipe gallery. Background Art

[0002] With the development of society, many cities have begun to build subways and integrated pipeline corridors. Generally, the buried depth of subways is greater than that of integrated pipeline corridors, so it is inevitable that pipeline corridors will cross the subway structure. Researchers have focused on the construction methods of the section of the pipeline corridor that crosses the subway structure, and have proposed measures such as integral casting of the pipeline corridor bottom plate and the bored pile cap, and erecting the pipeline corridor bottom plate on the underground continuous wall through the base. However, the pipeline corridor is disconnected by expansion joints. Due to the measures taken, the settlement of the section that crosses the subway structure can be approximately considered to be close to zero. Since the pipeline corridors at both ends of the upper span have not taken effective measures to reduce settlement, differential settlement will gradually form over time, affecting the overall visual quality of the pipeline corridor. If the uneven settlement at the expansion joint is too large, it may even damage the pipeline corridor structure and affect the waterproofing effect.

[0003] Regarding the construction method of an integrated pipeline corridor spanning different subway structures, it mainly includes: ① A reserved pedestrian passage for the pipeline corridor spanning the subway (CN202110876937.5 A pipeline corridor construction method spanning a subway passage, which adopts the form of cast-in-place piles and water-stop piles to cast the pedestal and the pipeline corridor bottom plate at the same time to form a whole, which is convenient for construction); ② The pipeline corridor spans the subway station (CN202110624354.3 A construction method for an integrated pipeline corridor spanning a subway station, in which the pipeline corridor is constructed above the subway station, aiming to solve the problem of protecting the subway station enclosure structure and waterproof structure during the construction of the integrated pipeline corridor and the problem of the station floating up); ③ The pipeline corridor spans the subway running line (CN202110171892.1 A structural construction method for the pipeline corridor spanning the subway intersection node, in which steel sheet piles are constructed on both sides of the integrated pipeline corridor as the foundation pit support structure, and underground continuous walls are constructed at set positions on both sides of the subway; excavation is carried out to the bottom of the integrated pipeline corridor, the integrated pipeline corridor base is constructed on the top of the underground continuous wall, and the integrated pipeline corridor concrete structure is cast). The existing technology focuses on the construction method of the section of the tunnel that crosses the subway structure, including the integral casting of the tunnel floor and the bored pile foundation, the installation of the tunnel floor on the underground continuous wall through the base, etc. However, the integrated tunnel is disconnected by expansion joints. Due to the measures taken, the settlement of the section that crosses the subway structure can be approximately considered to be close to zero. Since the tunnels at both ends of the upper span have not taken effective measures to reduce settlement, settlement differences will gradually form over time, affecting the overall visual quality of the tunnel. If the uneven settlement at the expansion joint is too large, it may even damage the tunnel structure and affect the waterproof effect. Therefore, how to effectively reduce the settlement of the structures at both ends of the tunnel that crosses the subway has become an urgent problem to be solved. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a construction method for reducing the structural settlement at both ends of the subway corridor. The original flat seam connection is changed to a staggered seam connection. Through a buffer zone of a certain length, the uneven settlement at the construction joint is effectively reduced, and the waterproof effect at the expansion joint is ensured.

[0005] The technical solution adopted by the present invention to solve the technical problem is to provide a construction method for reducing the settlement of the structure at both ends of the overpass subway corridor, including the following specific steps:

[0006] Step 1: Construction of the cap: After the construction of the supporting piles is completed and the pile heads are removed, the waterproof membrane of the slab is laid at the bottom of the cap, and an extension is reserved. This extension is used to connect with the waterproof structure of the standard section of the tunnel foundation. After the waterproof protective layer is poured, the steel bars of the cap and bottom plate are tied;

[0007] Step 2: Plate construction: The steel bars at the pedestal position are extended outward by 2 meters to form a plate. The thickness of the extended section is smaller than that of the pedestal, leaving space for the standard section of the pipe gallery cushion layer.

[0008] Step 3: Construction of the base plate of the upper subway corridor: The base plate of the upper subway corridor is poured on the cap. A steel edge water stop is reserved in the middle of the base plate of the upper subway corridor. The base plate, cap and slab are poured into a whole.

[0009] Step 4: Construction of the standard section pipeline corridor foundation: pour the standard section pipeline corridor foundation on one side of the slab;

[0010] Step 5: Construction of the standard section pipe gallery cushion layer: Flip the reserved end of the board waterproof membrane upwards to wrap the upper end surface of the board, then lay polystyrene board on the board, and then pour the standard section pipe gallery cushion layer on the polystyrene board and the standard section pipe gallery foundation;

[0011] Step 6. Construction of the standard section corridor floor: The steel edge water stop at the middle part of the upper subway corridor floor is welded to the steel bars in the standard section corridor floor. After completion, install strip polystyrene boards on the expansion joint above the steel edge water stop and between the standard section corridor floor and the upper subway corridor floor. Then complete the pouring of the standard section corridor floor. After completion, remove the strip polystyrene boards and inject two-component polysulfide sealant.

[0012] As a supplement to this technical solution, in step five, when polystyrene boards are fully laid on the planks, water-expanding waterstop strips need to be installed at the vertical expansion joints.

[0013] As a supplement to this technical solution, in step six, after the pouring of the standard section of the pipe gallery cushion layer is completed, the bottom plate waterproof membrane needs to be laid, and then the upturned scaffolding waterproof membrane is combined with the bottom plate waterproof membrane to form a waterproof protective layer.

[0014] Beneficial effects: The present invention relates to a construction method for reducing the settlement of the structures at both ends of a tunnel spanning a subway station. The method is extended on the basis of the existing construction method of a tunnel spanning a subway station. For example, the tunnel floor and the bored pile cap are integrally cast, and the tunnel floor is erected on the underground continuous wall through a base. This effectively reduces the uneven settlement at the construction joints, ensures the structural safety and waterproof effect of the tunnel at the expansion joints, and has a positive effect on the visual quality of the entire tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a construction flow chart of the present invention;

[0016] Figure 2 It is a plan view of the retaining plate template reinforcement of the present invention. DETAILED DESCRIPTION

[0017] Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiments are only used to illustrate the present invention and are not used in limiting the scope of the present invention.In addition, should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall equally within the scope limited by the appended claims of the application.

[0018] The embodiment of the present invention relates to a construction method for reducing the settlement of the structures at both ends of the overpass subway corridor, such as Figure 1 —2, including the following specific steps:

[0019] Step 1: Construction of the cap 6: After the construction of the supporting piles 10 is completed and the pile heads are removed, the slab waterproofing membrane 11 is laid at the lower part of the cap 6, and an extension is reserved. The extension is used to connect with the waterproof structure of the standard section of the tunnel foundation 9. After the waterproof protective layer is poured, the cap and bottom plate reinforcement are tied;

[0020] Step 2: Plate construction: The steel bars at the pedestal 6 are extended outward by 2 meters to form a plate. The thickness of the extended section is smaller than that of the pedestal 6, leaving space for the standard section of the pipe gallery cushion 5.

[0021] Step 3, construction of the upper subway corridor bottom plate 1: the upper subway corridor bottom plate 1 is poured on the cap 6. A steel edge water stop 2 is reserved in the middle of the upper subway corridor bottom plate 1. The upper subway corridor bottom plate 1, the cap 6 and the slab are poured into a whole;

[0022] Step 4: Construction of the standard section pipe gallery foundation 9: pour the standard section pipe gallery foundation 9 on one side of the slab;

[0023] Step 5: Construction of the standard section pipe gallery cushion layer 5: Flip the reserved end of the scaffolding waterproof membrane 11 upward to wrap the upper end surface of the scaffolding, then lay the polystyrene board 8 on the scaffolding, and then pour the standard section pipe gallery cushion layer 5 on the polystyrene board 8 and the standard section pipe gallery foundation 9;

[0024] Step 6. Construction of the standard section corridor floor 4: The steel edge water stop 2 at the middle part of the upper subway corridor floor 1 is welded to the steel bars in the standard section corridor floor 4. After completion, install the strip polystyrene board on the expansion joint above the steel edge water stop 2, between the standard section corridor floor 4 and the upper subway corridor floor 1, and then complete the pouring of the standard section corridor floor 4. After completion, remove the strip polystyrene board and inject the two-component polysulfide sealant 3.

[0025] As a supplement to the present technical solution, in step five, when the polystyrene board is fully laid on the plank, it is necessary to set a water-expanding waterstop strip 7 at the vertical expansion joint.

[0026] As a supplement to this technical solution, in step six, after the pouring of the standard section pipe gallery cushion layer 5 is completed, the bottom plate waterproof membrane 12 needs to be laid, and then the upturned board waterproof membrane 11 is combined with the bottom plate waterproof membrane 12 to form a waterproof protective layer.

[0027] The above is a detailed introduction to a construction method for reducing the settlement of the structure at both ends of the subway corridor provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, based on the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A construction method for reducing the settlement of structures at both ends of a subway corridor, characterized by: The specific steps include: Step 1, construction of the pedestal (6): after the construction of the supporting piles (10) is completed and the pile heads are removed, the paving of the waterproof membrane (11) at the lower part of the pedestal (6) is carried out, and an extension is reserved. The extension is used to connect with the waterproof structure of the standard section of the tunnel foundation (9). After the waterproof protective layer is poured, the pedestal and the bottom plate reinforcement are tied; Step 2: Construction of the slab: The steel bars at the pedestal (6) are extended outward by 2 meters to form a slab. The thickness of the extended section is smaller than that of the pedestal (6), leaving space for the standard section of the pipe gallery cushion (5); Step 3, construction of the upper subway corridor bottom plate (1): the pouring construction of the upper subway corridor bottom plate (1) is completed on the pedestal (6), a steel edge water stop (2) is reserved in the middle of the upper subway corridor bottom plate (1), and the upper subway corridor bottom plate (1), the pedestal (6) and the slab are poured into a whole; Step 4: Construction of the standard section pipe gallery foundation (9): pouring the standard section pipe gallery foundation (9) on one side of the slab; Step 5, construction of the standard section pipe gallery cushion layer (5): turn the reserved end of the scaffolding waterproofing membrane (11) upwards to wrap the upper end surface of the scaffolding, then lay the polystyrene board (8) on the scaffolding, and then pour the standard section pipe gallery cushion layer (5) on the polystyrene board (8) and the standard section pipe gallery foundation (9); Step 6. Construction of the standard section tunnel floor (4): The steel edge water stop (2) at the middle of the upper subway tunnel floor (1) is welded to the steel bars in the standard section tunnel floor (4). After completion, a strip of polystyrene board is installed above the steel edge water stop (2) and at the expansion joint between the standard section tunnel floor (4) and the upper subway tunnel floor (1). Then, the standard section tunnel floor (4) is cast. After completion, the strip of polystyrene board is removed and a two-component polysulfide sealant (3) is injected.

2. A construction method for reducing the settlement of structures at both ends of a subway corridor according to claim 1, characterized in that: In step 5, when the polystyrene board is fully laid on the slab, it is necessary to set a water-expanding water stop strip (7) at the vertical expansion joint position.

3. The construction method for reducing the settlement of the structures at both ends of a subway corridor according to claim 1 is characterized in that: In step six, after pouring the standard section pipe gallery cushion layer (5), the bottom plate waterproofing membrane (12) needs to be laid, and then the upturned board waterproofing membrane (11) is combined with the bottom plate waterproofing membrane (12) to form a waterproof protective layer.

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