Prefabricated diaphragm wall type fabricated subway entrance and exit structure

Abstract

The utility model discloses a prefabricated diaphragm wall type assembled subway entrance and exit structure which comprises side wall structures, a prefabricated top plate and a prefabricated bottom plate are arranged between the side wall structures of the entrance and exit, the prefabricated top plate and the prefabricated bottom plate are both connected with the side wall structures through ultrahigh concrete, and the side wall structures are formed by integrating an enclosure structure and a main body structure. The side wall structure comprises prefabricated underground diaphragm walls, and underground diaphragm wall inter-amplitude connecting assemblies are arranged between the adjacent prefabricated underground diaphragm walls. The foundation pit support structure, the waterproof curtain and the side wall of the main body structure are integrated, so that working hours and manufacturing cost are saved. According to the utility model, the connection scheme of the waterstop strip bags, the C / T inter-width connectors and the UHPC concrete wet joints is adopted between the prefabricated underground diaphragm walls, so that the waterproof and guiding effects are achieved. According to the utility model, the longitudinal tensioning connection scheme of the inter-width concave-convex tenons, the elastic sealing gaskets and the prestressed steel bars is adopted between the prefabricated plate widths, so that not only can shearing force be effectively transmitted, but also a water stopping effect can be achieved.

Description

Technical Field

[0001] This utility model belongs to the field of underground structure engineering technology, specifically relating to a prefabricated diaphragm wall type assembled subway entrance structure. Background Technology

[0002] Prefabricated buildings are highly energy-efficient, reducing carbon emissions by over 40% throughout their entire lifecycle. They offer advantages such as modular components, standardized production, and standardized assembly, significantly reducing energy consumption and construction waste. Mechanized installation during construction further minimizes air pollution, noise pollution, and wastewater emissions. Developing prefabricated buildings represents a major transformation in construction methods, contributing to resource and energy conservation, reduced construction pollution, and improved labor productivity and safety.

[0003] Currently, the traditional construction technology used for subway entrances and exits—the reinforced concrete cast-in-place system (also known as wet construction)—has significant drawbacks. First, it's a labor-intensive process, resulting in substantial waste of steel and cement. Second, it consumes excessive amounts of water. Third, construction sites are often dirty, chaotic, and substandard, frequently becoming major sources of urban particulate matter pollution. Fourth, it suffers from serious quality defects, with cracking and leakage being prominent issues. Fifth, it requires a large workforce, leading to soaring labor costs and difficulties in recruitment, management, and quality control. Given these prominent problems with existing underground structure designs, constructing a new prefabricated underground structure design system is a practical requirement for the construction and high-quality development of rail transit engineering.

[0004] Therefore, it is necessary to find a prefabricated diaphragm wall type prefabricated subway entrance structure and construction method to effectively save construction materials such as concrete and steel bars, and effectively solve the problems of high labor intensity, poor environment, and long construction period in the current construction environment. With the maturity of technology and equipment, the market prospects will be even broader. Summary of the Invention

[0005] This utility model is proposed to solve the problems existing in the prior art, and its purpose is to provide a prefabricated diaphragm wall type assembled subway entrance and exit structure.

[0006] The technical solution of this utility model is: a prefabricated diaphragm wall type prefabricated subway entrance and exit structure, including a side wall structure. A prefabricated top slab at the top and a prefabricated bottom slab at the bottom are provided between the side wall structures of the entrance and exit. The prefabricated top slab and the prefabricated bottom slab are connected to the side wall structure by ultra-high concrete. The side wall structure is a structural side wall that combines the enclosure structure and the main structure. The side wall structure includes prefabricated diaphragm walls, and diaphragm wall inter-panel connecting components are provided between adjacent prefabricated diaphragm walls.

[0007] Furthermore, both the precast top slab and the precast bottom slab include precast panels, and a precast panel connecting assembly is provided between adjacent precast panels.

[0008] Furthermore, the precast diaphragm wall has a pre-embedded sleeve on its side wall, which serves as the foundation for the steel reinforcement connection. The pre-embedded sleeve is located at the connection point between the precast top slab and the precast bottom slab.

[0009] Furthermore, the precast roof slab includes internal main reinforcement bars, which extend outward and are connected to embedded sleeves. The protruding sections of the main reinforcement bars are also provided with stirrups parallel to the precast diaphragm wall.

[0010] Furthermore, a steel bracket is provided on the inner side wall of the precast diaphragm wall to provide temporary support for the precast roof slab.

[0011] Furthermore, the precast base slab includes internal main reinforcement bars, the protruding sections of which are encircled by ultra-high concrete, and the precast diaphragm wall also has connecting reinforcement bars encircled by ultra-high concrete at its embedded sleeve.

[0012] Furthermore, the connecting side of the precast slab forms inter-width tenons with socket alignment, and an inter-slab elastic sealing gasket for sealing is provided between the inter-width tenons.

[0013] Furthermore, the precast slab is also provided with water-swellable sealing strips on its sidewalls.

[0014] Furthermore, the precast slab is provided with prestressed steel bars in the assembly direction, and the outer wall of the prestressed steel bars is formed with external threads, thereby enabling prestressing tensioning.

[0015] The beneficial effects of this utility model are as follows:

[0016] All precast slabs of this invention are manufactured in a factory, ensuring a single production environment, consistent performance, and controllable quality. After production, the precast slabs are directly transported from the factory to the construction site for installation, effectively reducing construction time, material waste, and improving construction precision.

[0017] This invention can not only shorten the construction period and reduce the amount of labor, but also generate almost no construction waste, reduce the construction site area, and reduce the impact on the production and life of surrounding residents.

[0018] This utility model integrates the foundation pit retaining structure, the water-stop curtain, and the main structure side walls into one unit, saving time and costs. The joints of the panel walls mostly adopt UHPC cast-in-place joints, which have excellent physical properties and reduce the amount of construction work and difficulty.

[0019] In this utility model, the precast diaphragm wall adopts a connection scheme of water-stop strip + C / T inter-wall connector + UHPC concrete wet joint, which has both waterproof and guiding functions.

[0020] In this invention, the precast slabs are connected by a longitudinal tensioning scheme consisting of inter-slab tenons, elastic sealing gaskets, and prestressed steel bars, which can effectively transfer shear force and also serve as a water stop.

[0021] This invention can effectively solve the problems of high labor intensity, poor working conditions, and long construction periods in existing construction environments. With the maturation of technology and equipment, its market prospects will be even broader. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of a standard section of a subway entrance / exit according to this utility model;

[0023] Figure 2 This is a plan view of the prefabricated diaphragm wall at the subway entrance of this utility model;

[0024] Figure 3 This is a plan view of the prefabricated slab for subway entrances and exits of this utility model;

[0025] Figure 4 This is a schematic diagram of the connection between the precast roof slab and the precast diaphragm wall of this utility model;

[0026] Figure 5 This is a schematic diagram showing the connection between the precast base plate and the precast diaphragm wall of this utility model;

[0027] Figure 6 This is a schematic diagram of the inter-panel connection of the prefabricated diaphragm wall of this utility model;

[0028] Figure 7 This is a schematic diagram of the connection between the precast slabs of the climbing section of this utility model;

[0029] Figure 8 This is a schematic diagram of the connection between the straight sections of the precast slabs of this utility model;

[0030] Figure 9 This is a schematic diagram of the application of the precast diaphragm wall according to this utility model;

[0031] Figure 10 This is a schematic diagram of the first temporary steel support erected according to this utility model;

[0032] Figure 11 This is a schematic diagram of the second temporary steel support erected according to this utility model;

[0033] Figure 12 This is a schematic diagram of the prefabricated base plate assembly of this utility model;

[0034] Figure 13 This is a schematic diagram of the installation of steel brackets and assembly of prefabricated roof slabs according to this utility model;

[0035] Figure 14 This is a schematic diagram of the removal of temporary steel supports according to this utility model;

[0036] in:

[0037] 1. Precast diaphragm wall; 2. Ultra-high concrete.

[0038] 3 Precast roof slab 4 Precast floor slab

[0039] 5 First temporary steel support 6 Second temporary steel support

[0040] 7. Bored piles 8. Jet grouting piles

[0041] 9. Water-stop curtain; 10. Main structure retaining piles

[0042] 11 Main structural side wall; 12 Entrance / exit cast-in-place side wall

[0043] 13 Precast slab 14 Cast-in-place slab

[0044] 15 Precast diaphragm wall main reinforcement 16 Embedded sleeve

[0045] 17 Main reinforcement bars of the top slab 18 Steel corbel

[0046] 19. Main reinforcement bars of the base plate; 20. Embedded angle steel.

[0047] 21. Bag-type sealing gasket; 22. T-type connector.

[0048] 23 C-type connectors, 24 concrete between spans

[0049] 25 prestressed steel bars; 26 interlocking tenons

[0050] 27. Inter-plate elastic sealing gasket; 28. Water-swellable waterproof sealing strip. Detailed Implementation

[0051] The present invention will now be described in detail with reference to the accompanying drawings and embodiments:

[0052] like Figures 1 to 14 As shown, a prefabricated diaphragm wall type prefabricated subway entrance structure includes a side wall structure. A prefabricated top slab 3 at the top and a prefabricated bottom slab 4 at the bottom are provided between the side wall structures of the entrance. The prefabricated top slab 3 and the prefabricated bottom slab 4 are connected to the side wall structure through ultra-high concrete 2. The side wall structure is a structural side wall that combines the enclosure structure and the main structure. The side wall structure includes a prefabricated diaphragm wall 1, and a diaphragm wall section connection component is provided between adjacent prefabricated diaphragm walls 1.

[0053] Both the precast top slab 3 and the precast bottom slab 4 include precast slabs 13, and a precast slab connecting component is provided between adjacent precast slabs 13.

[0054] An embedded sleeve 16 is pre-installed on the side wall of the precast diaphragm wall 1. The embedded sleeve 16 serves as the foundation for the connection of the reinforcing bars. The embedded sleeve 16 is installed at the connection position between the precast top slab 3 and the precast bottom slab 4.

[0055] The precast roof slab 3 includes an internal main slab reinforcement 17, which extends outward and is connected to a pre-embedded sleeve 16. The protruding section of the main slab reinforcement 17 is also provided with stirrups parallel to the precast diaphragm wall 1.

[0056] A steel bracket 18 is provided on the inner side wall of the precast diaphragm wall 1, and the steel bracket 18 provides temporary support for the precast roof slab 3.

[0057] The precast base slab 4 includes an internal main reinforcement bar 19, the protruding section of which is encircled in the ultra-high concrete 2. The precast diaphragm wall 1 also has connecting reinforcement bars encircled in the ultra-high concrete 2 at the embedded sleeve 16.

[0058] The connecting side of the precast slab 13 forms a tenon 26 for inter-spanel alignment, and an inter-spanel elastic sealing gasket 27 for sealing is provided between the tenons 26.

[0059] The precast slab 13 is also provided with a water-swellable waterproofing strip 28 on its side wall.

[0060] The precast slab 13 is provided with prestressed steel bars 25 in the assembly direction. The prestressed steel bars 25 have external threads on their outer walls, which enable prestressing tensioning.

[0061] Specifically, such as Figure 1 As shown, a first temporary steel support 5 and a second temporary steel support 6 are provided between the side walls of the two-wall structure. Under the support of the first temporary steel support 5 and the second temporary steel support 6, the precast top slab 3 and the precast bottom slab 4 are constructed.

[0062] Specifically, such as Figure 2 As shown, the precast diaphragm wall 1 is assembled as the main body of the side wall structure. Drilled piles 7 are installed outside the precast diaphragm wall 1 and the cast-in-place side wall 12 at the entrance and exit. Jet grouting piles 8 and main structure maintenance piles 10 are installed outside the drilled piles 7. A water-stop curtain 9 is installed between the jet grouting piles 8 and the main structure maintenance piles 10. The main structure side wall 11 is installed outside the main structure maintenance piles 10.

[0063] Specifically, such as Figure 3 As shown, the precast slab 13 is connected to the precast diaphragm wall 1 by ultra-high concrete 2, and the precast diaphragm wall 1 can also be connected by cast-in-place slab 14.

[0064] Specifically, such as Figure 4As shown, the main reinforcement 17 of the top slab is aligned and connected with the embedded sleeve 16 in the precast diaphragm wall 1. Stirrups or transverse mesh are set in the connection section, and the two are connected when the ultra-high concrete 2 is poured.

[0065] More specifically, grooves are formed on the opposite sidewalls of the precast top slab 3 and the precast diaphragm wall 1 to ensure a firm connection between the ultra-high concrete 2.

[0066] More specifically, the lateral length of the upper support surface of the steel bracket 18 is greater than the lateral length of the ultra-high concrete 2, thereby enabling temporary support for the precast roof slab 3.

[0067] Specifically, such as Figure 5 As shown, the main reinforcement 19 of the precast base slab 4 is staggered with the embedded sleeve 16 of the precast diaphragm wall 1. Both of them use ring reinforcement bars, which pass through the reinforcement bars laterally to form a reinforcement mesh. Based on the above reinforcement mesh, ultra-high concrete 2 is poured to realize the connection between the precast base slab 4 and the precast diaphragm wall 1.

[0068] Specifically, such as Figure 6 As shown, the diaphragm wall inter-panel connection assembly between precast diaphragm walls 1 includes alignment grooves on the side walls. Two alignment grooves are assembled into a casting cavity, in which inter-panel concrete 24 is poured.

[0069] More specifically, a C-shaped connector 23 is formed by recessing the bottom of the groove on one side, and a T-shaped connector 22 is provided on the groove on the other side. The C-shaped connector 23 and the T-shaped connector 22 are assembled and fixed.

[0070] Specifically, the diaphragm wall inter-panel connection assembly also includes a strip-type sealing gasket 21 disposed on the connection side.

[0071] Specifically, pre-embedded angle steel 20 is provided on the inner side wall of the foundation pit of the precast diaphragm wall 1, and adjacent pre-embedded angle steel 20 are welded and fixed.

[0072] Specifically, such as Figures 7 to 8 As shown, the connection of the precast slab 13 includes a straight section connection and a sloping section connection. The precast slab 13 is provided with a through hole through which the prestressed steel bar 25 can pass. The position of the inter-width tenon 26 is provided with a groove to accommodate the tension nut.

[0073] Specifically, in this utility model, the foundation pit retaining structure adopts a precast diaphragm wall 1, which also serves as the side wall of the main structure during the use stage. The precast diaphragm wall 1 has a pre-embedded sleeve 16 for steel bar connection, which is connected to the precast slab 13 through a cast-in-place wet joint.

[0074] Specifically, the joint between the precast slab 13 and the precast diaphragm wall 1 is mostly made of UHPC (ultra-high performance concrete) cast-in-place joint, which has excellent physical properties and reduces the amount of construction work and the difficulty of construction.

[0075] Specifically, the diaphragm wall inter-span connection assembly adopts a connection scheme of "waterstop strip + C / T inter-span connector + UHPC concrete wet joint", which has both waterproof and guiding functions.

[0076] Specifically, the precast slab connection assembly adopts a connection scheme of "inter-slab tongue and groove joint + elastic sealing gasket + prestressed steel bar longitudinal tensioning", which can effectively transmit shear force and also play a role in water stop.

[0077] This utility model features a highly prefabricated station entrance / exit structure. Compared to traditional on-site casting methods, this method effectively saves on construction materials such as concrete and steel bars, and effectively solves problems such as high labor costs, poor environmental conditions, and long construction periods in existing construction environments.

[0078] A construction method for a prefabricated diaphragm wall type assembled subway entrance structure includes the following steps:

[0079] A. Assemble the prefabricated diaphragm wall 1;

[0080] B. Excavate the foundation pit to below the first temporary steel support 5;

[0081] C. Install the first temporary steel support 5;

[0082] D. The excavation of the foundation pit extends to below the second temporary steel support 6;

[0083] E. Install the second temporary steel support 6;

[0084] F. Continue excavating to the bottom of the pit to construct the foundation layer and assemble the precast base plate 4;

[0085] G. Install steel bracket 18;

[0086] H. Assemble the precast roof slab 3;

[0087] I. Remove the temporary steel supports and dismantle the precast diaphragm wall 1 of the upper segment;

[0088] J. Backfill with soil and restore the road surface.

[0089] Specifically, step A involves assembling the precast diaphragm wall 1, and the specific process is as follows:

[0090] The trough was constructed using mud slurry for wall protection. The Z-shaped section of the civil defense section was used as the first section, and the prefabricated diaphragm wall 1 was assembled on both sides of the entrance and exit. The prefabricated diaphragm wall 1 was then topped with a capping beam.

[0091] Specifically, in step F, the excavation continues to the bottom of the pit to construct the foundation layer, and the precast base slab 4 is assembled. The specific process is as follows:

[0092] First, excavate to the bottom of the pit to construct the foundation layer, and then assemble the precast base plate 4;

[0093] Then, the reinforcing bars are connected by the pre-embedded sleeves 16 embedded in the prefabricated diaphragm wall 1;

[0094] Finally, the precast base slab 4 and the precast diaphragm wall 1 are connected by post-cast UHPC.

[0095] Specifically, step H involves assembling the precast roof slab 3, and the specific process is as follows:

[0096] First, the precast top slab 3 is assembled, and the reinforcing bars are connected through the pre-embedded sleeves 16 embedded in the precast diaphragm wall 1.

[0097] Then, the precast roof slab 3 and the precast diaphragm wall 1 are connected by post-cast UHPC, and the roof slab is waterproofed.

[0098] Specifically, step I involves removing the temporary steel supports and dismantling the precast diaphragm wall 1 of the upper segment. The specific process is as follows:

[0099] Remove the first temporary steel support 5 and the second temporary steel support 6, remove the upper segment precast diaphragm wall 1, and treat the waterproofing between the vertical joints above the middle segment precast diaphragm wall 1.

[0100] All precast slabs of this invention are manufactured in a factory, ensuring a single production environment, consistent performance, and controllable quality. After production, the precast slabs are directly transported from the factory to the construction site for installation, effectively reducing construction time, material waste, and improving construction precision.

[0101] This invention can not only shorten the construction period and reduce the amount of labor, but also generate almost no construction waste, reduce the construction site area, and reduce the impact on the production and life of surrounding residents.

[0102] This utility model integrates the foundation pit retaining structure, the water-stop curtain, and the main structure side walls into one unit, saving time and costs. The joints of the panel walls mostly adopt UHPC cast-in-place joints, which have excellent physical properties and reduce the amount of construction work and difficulty.

[0103] In this utility model, the precast diaphragm wall adopts a connection scheme of water-stop strip + C / T inter-wall connector + UHPC concrete wet joint, which has both waterproof and guiding functions.

[0104] In this invention, the precast slabs are connected by a longitudinal tensioning scheme consisting of inter-slab tenons, elastic sealing gaskets, and prestressed steel bars, which can effectively transfer shear force and also serve as a water stop.

[0105] This utility model can effectively solve the problems of high labor intensity, poor environment, and long construction period in existing construction environments. With the maturity of the technology and equipment, its market prospects will be even broader.

Claims

1. A prefabricated diaphragm wall type assembled subway entrance / exit structure, including side wall structures, characterized in that: A precast top slab (3) at the top and a precast bottom slab (4) at the bottom are provided between the side wall structures of the entrance and exit. The precast top slab (3) and the precast bottom slab (4) are connected to the side wall structure through ultra-high concrete (2). The side wall structure is a structural side wall that combines the enclosure structure and the main structure. The side wall structure includes a precast diaphragm wall (1). A diaphragm wall section connection component is provided between adjacent precast diaphragm walls (1).

2. The prefabricated diaphragm wall type assembled subway entrance structure according to claim 1, characterized in that: The precast top slab (3) and precast bottom slab (4) both include precast slabs (13), and precast slab connecting components are provided between adjacent precast slabs (13).

3. The prefabricated diaphragm wall type assembled subway entrance structure according to claim 1, characterized in that: The precast diaphragm wall (1) has a pre-embedded sleeve (16) on its side wall. The pre-embedded sleeve (16) serves as the foundation for the steel reinforcement connection. The pre-embedded sleeve (16) is set at the connection position of the precast top slab (3) and the precast bottom slab (4).

4. A prefabricated diaphragm wall type assembled subway entrance structure according to claim 3, characterized in that: The precast top slab (3) includes an internal top slab main reinforcement (17), the top slab main reinforcement (17) extends outward and is connected to the pre-embedded sleeve (16), and the protruding section of the top slab main reinforcement (17) is also provided with stirrups parallel to the precast diaphragm wall (1).

5. A prefabricated diaphragm wall type assembled subway entrance structure according to claim 4, characterized in that: A steel bracket (18) is provided on the inner side wall of the precast diaphragm wall (1), and the steel bracket (18) provides temporary support for the precast top slab (3).

6. A prefabricated diaphragm wall type assembled subway entrance structure according to claim 3, characterized in that: The precast base plate (4) includes an internal base plate main reinforcement (19), the protruding section of the base plate main reinforcement (19) is surrounded by ultra-high concrete (2), and the precast diaphragm wall (1) is also provided with connecting reinforcement bars surrounded by ultra-high concrete (2) at the pre-embedded sleeve (16).

7. A prefabricated diaphragm wall type assembled subway entrance structure according to claim 2, characterized in that: The connecting side of the precast slab (13) forms a tenon (26) for inter-spanel alignment, and an inter-spanel elastic sealing gasket (27) for sealing is provided between the tenons (26).

8. A prefabricated diaphragm wall type assembled subway entrance structure according to claim 7, characterized in that: The precast slab (13) is also provided with a water-swellable sealing strip (28) on its side wall.

9. A prefabricated diaphragm wall type assembled subway entrance structure according to claim 7, characterized in that: The precast slab (13) is provided with a prestressed steel bar (25) in the assembly direction. The prestressed steel bar (25) has an external thread on its outer wall, so that prestressing can be performed.

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