Prefabricated assembly type subway station

Abstract

The utility model discloses a prefabricated assembly type subway station which is characterized by comprising a plurality of horizontal and vertical assemblies, and each horizontal assembly comprises a top plate assembly, a middle plate assembly and a bottom plate assembly; the vertical assembly comprises outer wall assemblies arranged on the two sides and a middle column or wall vertical assembly and plays a role in supporting the horizontal assembly. The top plate assembly and the middle plate assembly are formed by splicing hollow box-shaped units in the longitudinal direction of the station, a cast-in-place concrete laminated layer is arranged on the top face of the top plate assembly, and each box-shaped unit is formed by splicing an upper prefabricated plate, a lower prefabricated plate, a steel web member and an inclined strut, the hollow parts of the box type units are used for pipelines to pass through, and the height of the units, the distance between web members and the like are determined according to stress and function requirements; the bottom plate assembly is of a cast-in-place structure. The outer wall assembly is a laminated wall or a cast-in-place wall, the laminated wall is composed of a single-face or double-face prefabricated assembly wall plate and cast-in-place concrete, a cast-in-place layer of the outer wall assembly is connected with a laminated cast-in-place layer of the top plate assembly and the bottom plate assembly, and the station is provided with a fully-wrapped waterproof layer and a splicing seam waterproof layer.

Description

Technical Field

[0001] This utility model belongs to the technical field of prefabricated and assembled subway stations in underground engineering, specifically involving a prefabricated and assembled subway station scheme and construction method based on a steel web member-precast concrete (PC) combined box structure and stacking process. Background Technology

[0002] Cast-in-place concrete technology has many drawbacks (such as poor on-site working conditions, complex procedures and high labor demand, significant impact on the surrounding environment, long cycle time, significant influence from weather and climate, and poor curing conditions), making it difficult to meet the future development needs of the industry. Prefabricated and industrialized technologies are the inevitable direction for the development of the construction industry. Under the guidance of relevant policies, underground rail transit stations have begun to explore and practice prefabricated assembly structures and have made initial progress. However, existing prefabricated subway station solutions have many problems that urgently need to be solved: such as leakage and waterproofing issues, difficulty in standardizing components and low mold reuse rates leading to high costs, problems with heavy and large components making hoisting difficult, and low installation tolerance and feasibility. Summary of the Invention

[0003] To address the aforementioned issues, this application proposes a novel prefabricated modular subway station design and its construction method.

[0004] Firstly, the prefabricated assembled subway station proposed in this application has the following specific technical solution:

[0005] A prefabricated modular subway station, characterized in that it mainly comprises:

[0006] The horizontal components arranged in parallel from top to bottom include a top plate component, a middle plate component, and a bottom plate component. When there is only one station floor, there is no middle plate component; when there are more than one floor, there is one or more middle plate components.

[0007] And a vertical component perpendicular to the horizontal component, the vertical component supporting the horizontal component, which includes the left and right outer wall components and the middle column component or middle partition wall component. The outer wall components are arranged at the left and right ends of the horizontal component and extend along the train travel direction. The outer wall components adopt a three-layer composite or cast-in-place wall. The middle column component is arranged parallel between the left and right outer wall components and is spaced along the train travel direction. The middle column component adopts steel pipe concrete or steel-concrete composite column. The middle column component is not required.

[0008] It also includes prefabricated platform layer structure components that are set on top of the base plate assembly and below the middle plate assembly.

[0009] The base plate assembly consists of a central cast-in-place reinforced concrete slab, cast-in-place short walls at both ends of the slab connected to the outer wall assembly, and longitudinal beams extending along the train's direction of travel. The longitudinal beams are optional and not mandatory.

[0010] Furthermore, the top slab assembly and middle slab assembly of the horizontal component are both composed of hollow box-shaped structures and longitudinal beams extending along the longitudinal direction of the station (train travel direction). The hollow box-shaped structure is assembled from a series of hollow box-shaped units along the longitudinal direction of the station. Each hollow box-shaped unit is assembled from an upper precast slab, a lower precast slab, and web members, diagonal braces, etc., arranged between the upper and lower precast slabs. The longitudinal beams in the top slab assembly and middle slab assembly are only provided when the station is equipped with a central column assembly.

[0011] The upper and lower precast slabs of the hollow box-type unit can preferably be prestressed slabs or ordinary reinforced concrete slabs. The web members are arranged in a zigzag pattern in a row perpendicular to the train travel direction (station transverse direction), and are also arranged in rows at intervals along the train travel direction (station longitudinal direction). The diagonal braces are arranged between the rows of web members and are also arranged at intervals in the transverse direction of the station. The diagonal braces are used to strengthen the integrity and seismic performance of the hollow box-type unit. The web members and diagonal braces are preferably made of steel pipes, steel sections, or steel-concrete composite members. The upper and lower precast slabs of the hollow box-type unit... A protruding beam extending perpendicular to the train's direction of travel is provided at the connection points of the web members at both ends. Bolts are pre-embedded in the beams to facilitate bolt connection between the web members and the upper and lower precast slabs of the hollow box-type unit. Preferably, the upper precast slab of the hollow box-type unit is connected to the upper precast slab of an adjacent hollow box-type unit, or the lower precast slab is connected to the lower precast slab of an adjacent unit using cast-in-place concrete wet connection, bolt connection, or prestressed tendon connection. Furthermore, the hollow box-type unit can be further divided laterally in the station according to lifting and installation requirements to achieve staggered and continuous joint assembly.

[0012] Through the above technical solution, the hollow box-shaped structure of the station roof and middle slab components allows for the passage of ventilation ducts within the space between the upper and lower precast slabs of each unit. Furthermore, the hollow box-shaped unit space of the station middle slab above the subway vehicle is equipped with a rail-top ventilation duct isolation plate extending along the train's direction of travel and meeting airtightness and fire resistance requirements. The internal space enclosed by the rail-top ventilation duct isolation plate and the middle slab component can be used as a rail-top heat exhaust duct, thus avoiding the need for secondary construction of the rail-top heat exhaust duct as required by traditional cast-in-place techniques, and eliminating the need for secondary hoisting of rail-top ventilation duct components as in existing prefabricated solutions, thereby improving construction convenience. Simultaneously, the hollow box-shaped unit can be disassembled into upper precast slabs, lower precast slabs, and web members during production and transportation. The upper and lower precast slabs can be further disassembled into smaller sections, reducing the difficulty of production, transportation, and hoisting, improving component standardization and mold reuse rate, and contributing to cost reduction.

[0013] Preferably, each hollow box-shaped unit of the station roof slab assembly and the middle slab assembly can preferably be provided with two or more rows of web members along the train travel direction; the distance between the upper and lower precast slabs of the hollow box-shaped unit, the number of boxes (two rows of web members form one box), and the size of the web members are adjusted according to the column spacing of the longitudinal and transverse central column assemblies of the station, the load of the roof slab cover, and the requirements for equipment pipeline installation and maintenance.

[0014] Furthermore, diagonal bracing is provided along the longitudinal direction of the station (i.e., the direction of train travel) in the interior of the hollow box-type unit of the roof slab assembly and the middle slab assembly, and between the upper and lower precast slabs. The diagonal bracing is arranged at intervals along the transverse direction of the station (i.e., perpendicular to the direction of train travel). The diagonal bracing is used to enhance the overall stability and seismic performance of the hollow box-type unit.

[0015] Furthermore, the prefabricated metro station of this application preferably adopts a structure without central column components, or adopts a structure with one or more rows of central column components between the outer wall components on the left and right sides, depending on the building function requirements and the load size. The central column components are arranged at intervals along the train travel direction. Preferably, for the station structure with central column components, the longitudinal beams of its top plate component and middle plate component can be prestressed hollow beams or solid beams.

[0016] By adopting the above technical solutions, the prefabricated modular subway station of this application has the ability to adapt to different widths, different burial depths and load conditions, as well as meet the needs of different building functional layouts.

[0017] Preferably, the exterior wall components on the left and right sides of the station are preferably three-layer composite walls or cast-in-place reinforced concrete walls. The three-layer composite wall consists of an inner precast wall panel, an outer precast wall panel, and a middle cast-in-place concrete composite layer. The precast wall panels are connected and assembled into hollow box-shaped wall units by precast webs and steel members. After the hollow box-shaped wall units are hoisted, they are assembled into a larger hollow box-shaped wall, and then the middle cast-in-place composite layer is poured to form a complete composite wall. The precast webs can preferably be reinforced concrete slabs or steel web members, and the precast webs are arranged at intervals along the train travel direction. Additional precast webs can be added as needed. Concrete flow holes are reserved on the slab so that cast-in-place concrete can pass through the precast web. Furthermore, the width and height of the three-layer composite wall unit are adjusted according to the horizontal and vertical spacing of the internal supports of the station foundation pit and are installed in sections and segments. The specific construction method is as follows: First, the precast wall panel on the outer side of the station is hoisted and temporarily fixed. Second, the precast web is hoisted and temporarily fixed. Third, the precast wall panel on the inner side is hoisted and assembled with the precast wall panel and precast web of the outer side hoisted in the first two steps to form a hollow box wall. Finally, the middle concrete cast-in-place composite layer is poured.

[0018] By adopting the above technical solution, on the one hand, compared with the prefabricated solid wall in sections, this application reduces the volume and weight of production and hoisting, and reduces the difficulty of construction; on the other hand, compared with the traditional cast-in-place concrete technology, the three-layer composite wall of this application is first assembled into a hollow box-shaped wall, which can be used as the template for the middle cast-in-place composite layer, thereby saving templates and improving construction efficiency.

[0019] Preferably, a layer of reinforced concrete cast-in-place composite layer is provided on the top surface of the upper precast slab of the hollow box-shaped unit of the station roof slab assembly of this application; tie bars are reserved on the top surface of the upper precast slab to strengthen the integrity of the precast slab and the cast-in-place composite layer; furthermore, the cast-in-place composite layer of the outer wall assemblies on the left and right sides of the station, the cast-in-place composite layer on the top surface of the hollow box-shaped unit, and the cast-in-place reinforced concrete of the station's bottom slab are connected at the junction.

[0020] By adopting the above technical solution, the cast-in-place composite layer of the station roof slab, the cast-in-place composite layer of the exterior wall, and the cast-in-place reinforced concrete of the base slab are integrally connected to form a closed cast-in-place concrete waterproof layer, achieving the most basic structural self-waterproofing.

[0021] Furthermore, waterproofing measures such as elastic rubber sealing gaskets are installed at the joints of the precast panels in the hollow box-shaped structure of the station roof and at the joints of the precast wall panels in the composite walls on both sides of the station to further enhance the waterproofing performance of the roof and composite walls themselves.

[0022] Furthermore, before constructing the external wall components, an outer waterproof membrane is laid on the leveled foundation pit support surface; for stations using three-layer composite walls, concrete flow holes are reserved on the precast wall panels on the outside of the composite walls. When the middle cast-in-place composite layer is poured, the concrete fills the gap between the composite wall and the foundation pit support through the flow holes; or grouting pipes are reserved on the outside of the composite walls, and the gap between the composite wall and the foundation pit support is filled by grouting.

[0023] By adopting the above technical solutions, the waterproof layers of the prefabricated station base slab, exterior wall, and roof slab components can be sealed into a ring, forming a multi-layered waterproof system consisting of skin-like external waterproofing, cast-in-place concrete waterproofing, and elastic sealing waterproofing at the assembly joints, thus meeting the first-level waterproofing requirements of subway stations.

[0024] Secondly, this application provides a construction method for prefabricated assembled subway stations disclosed in the first aspect, the specific technical solution of which is as follows:

[0025] Step 1: Construct the retaining structure of the station foundation pit and excavate to the base; at the same time, produce prefabricated components in the factory;

[0026] Step 2: Waterproofing the station floor slab and installing the floor slab components. For stations with central column components, install steel pipe concrete columns or steel-concrete composite columns at the same time.

[0027] Step 3: First, construct the outer waterproof layer on the outside of the exterior wall components. For stations using three-layer composite walls, hoist and temporarily fix the precast wall panels on the outside of the composite wall. Then, hoist the precast web plates and the inner precast wall panels of the composite wall in sequence to assemble a complete hollow box-shaped wall. Then, pour the intermediate cast-in-place composite layer to a certain height to fix the base of the composite wall. For stations using cast-in-place exterior walls, formwork is erected and the cast-in-place exterior wall is poured to below the station's middle slab. Preferably, for stations using composite walls where concrete flow holes are not pre-reserved on the precast wall panels on the outside of the composite wall, a grouting pipe is reserved between the waterproof layer and the precast wall panels on the outside of the composite wall. After the station roof slab is completed, grout is injected to fill the gap between the waterproof layer and the composite wall.

[0028] Step 4: For stations with central column assemblies, hoist the longitudinal beams of the station's central slab assembly in sections;

[0029] Step 5: Construction of precast slab components, that is, first assembling the upper precast slab, lower precast slab, web members, diagonal braces, etc. into hollow box-shaped units on the ground according to the design, and then hoisting them into place and connecting them with the longitudinal beams and external wall components; for the cast-in-place wet joints between the hollow box-shaped units, wait for the joints to reach the design strength;

[0030] Step Six: Continue constructing the exterior wall components upwards to the lower precast slab position of the roof slab components; for stations with central column components, hoist the longitudinal beams of the station roof slab components in sections;

[0031] Step 7: Construct the hollow box-shaped structure of the station roof slab assembly in the same manner as in Step 5;

[0032] Step 8: Construct the cast-in-place composite layer of the roof slab of the construction station, wherein the two ends of the composite layer are cast together with the cast-in-place composite layer of the exterior wall components to achieve connection;

[0033] Step 9: For a three-layer composite wall station, when grouting pipes are reserved on the outside, first grout to fill the gap between the outer wall components and the foundation pit retaining wall; construct the waterproof layer and protective layer on the upper surface of the cast-in-place composite layer of the roof slab components, and backfill with soil after acceptance.

[0034] Step 10: Assemble the prefabricated internal structures, such as platform panels.

[0035] By adopting the above technical solutions, the station structure construction achieved a high prefabrication rate, reducing on-site work intensity. The simultaneous production of prefabricated components and on-site assembly improved construction speed. The prefabricated composite exterior walls and the top and middle slab components of the prefabricated hollow box-type structure reduced the amount of on-site formwork and supports, making the construction process more energy-efficient and environmentally friendly. The small size and weight of prefabricated components improved component standardization and mold reuse rates, which is beneficial for improving feasibility and cost control. Simultaneously, the above technical solutions enable a multi-layered waterproofing system consisting of external waterproofing, structural self-waterproofing, and joint waterproofing.

[0036] In summary, the above-described technical solutions conceived in this application can achieve the following beneficial effects:

[0037] 1. The hollow box-shaped structure composed of steel web members and precast slabs in the top and middle slab components has a reasonable and efficient stress distribution. Compared with traditional solid thick slabs, the proposed solution is more suitable for large-span stations. Compared with arched top slabs, the proposed solution has a higher space utilization rate and can avoid significantly increasing the station's burial depth like arched structures, which is conducive to controlling costs.

[0038] 2. The hollow box-type structure combining steel web members and precast slabs in the top and middle slab components features a unified structural form. Precast components are easily disassembled and miniaturized, improving standardization and mold reuse rates. This facilitates control over component weight and dimensions, streamlines production, transportation, and hoisting, controls costs, increases production efficiency, and accelerates overall construction. 3. The hollow box-type structure combining steel web members and precast slabs in the top and middle slab components allows for unobstructed flow of internal space along both the longitudinal and transverse directions of the station. The internal space can also serve as a pipeline installation space, with pre-reserved inspection ports enabling installation and maintenance, thus reducing the damaging effects of pipeline supports and drilling into the main structure. For the hollow box-type structure of the middle slab, the space above the vehicle track can also function as a rail-top heat exhaust duct, reducing secondary structural construction and achieving integration of structure and building function.

[0039] 4. The use of hollow box-type top and middle slabs and a three-layer composite exterior wall scheme reduces the use of formwork and supports, making the construction process more energy-efficient and environmentally friendly.

[0040] 5. By setting a cast-in-place composite layer in the top slab assembly and connecting it with the intermediate cast-in-place composite layer in the outer wall assembly, and further connecting it with the cast-in-place bottom slab assembly, a closed cast-in-place concrete self-waterproofing structural layer is formed. At the same time, based on the prefabricated station of this application, a full external waterproofing layer can still be set. In addition to the waterproofing structure of the prefabricated assembly joints, a three-level waterproofing system of full external waterproofing + cast-in-place self-waterproofing + assembly joint waterproofing can be formed, which meets the first-level waterproofing requirements of subway stations. Attached Figure Description

[0041] The specific embodiments of this application will be further described in detail below with reference to the accompanying drawings. In this application, "lateral" means perpendicular to the direction of train travel, and "longitudinal" means parallel to the direction of train travel.

[0042] Figure 1 A cross-sectional view of a prefabricated metro station with a single row of central columns.

[0043] Figure 2 A cross-sectional view of a prefabricated metro station without a central column component.

[0044] Figure 3 A longitudinal cross-sectional view of a prefabricated subway station.

[0045] Figure 4 A schematic diagram of the cross-section of the exterior wall component.

[0046] Figure 5 Schematic diagram of vertical ring-type wet joint for composite exterior wall components.

[0047] Figure 6 Schematic diagram of vertical / horizontal bolt connections for composite exterior wall components.

[0048] Figure 7 for Figure 5 A schematic diagram of the vertical joint from the C-direction elevation.

[0049] Figure 8 Schematic diagram of the double-compartment structure of the roof / middle slab assembly of the station.

[0050] Figure 9 Schematic diagram of a single-compartment unit of the web-staff box-type structure of the station roof / middle slab assembly.

[0051] Figure 10 Schematic diagram of wet joint connection between upper and lower precast slabs of hollow box-type unit.

[0052] Figure 11 Schematic diagram of bolted joint connection between upper and lower precast slabs of hollow box-type unit.

[0053] Figure 12 Schematic diagram of prestressed tendon connection between upper and lower precast slabs of hollow box-type unit.

[0054] Figure 13 and Figure 14 Schematic diagram of segmented connection of the longitudinal beams of the station.

[0055] Figure 15 for Figure 1 Enlarged view of a portion of region A: Schematic diagram of the connection nodes between the longitudinal beam and the upper and lower precast slabs of the hollow box-shaped structure.

[0056] Figure 16 Schematic diagram of waterproofing structure for prefabricated panel assembly joints in exterior wall components.

[0057] The components / components in the attached diagram are labeled with Arabic numerals, and the labels are explained as follows: 1-Station roof slab component; 2-Station middle slab component; 3-Exterior wall component; 4-Station floor slab component; 6-Middle column component; 11-Lower precast slab of the roof slab component; 12-Upper precast slab of the roof slab component; 13-Web members (steel pipe, steel section, or steel-concrete composite members) of the roof slab component; 14-Diagonal bracing of the roof slab component; 15-Cast-in-place composite layer of the roof slab component; 16-Upward-turning beam of lower precast slab 11 of the roof slab component; 17-Downward-turning beam of upper precast slab 12 of the roof slab component; 18-Longitudinal beam of the roof slab component; 21-Lower precast slab of the middle slab component. 22 - Upper precast slab of the middle slab assembly; 23 - Web member of the middle slab assembly; 24 - Diagonal brace of the middle slab assembly; 25 - Upper flip beam of the lower precast slab 21 of the middle slab assembly; 26 - Lower flip beam of the upper precast slab 22 of the middle slab assembly; 27 - Longitudinal beam of the middle slab assembly; 28 - Rail top ventilation duct isolation plate; 31 - Precast slab of the exterior wall assembly; 32 - Intermediate cast-in-place composite layer of the exterior wall assembly; 33 - Precast web of the box-type unit of the exterior wall assembly; 34 - Assembly bolt of the exterior wall assembly; 35 - Positioning block between precast assembled box-type wall units of the exterior wall assembly; 36 - Concrete flow hole; 37 - Hollow box-type wall unit of the exterior wall assembly. 38 - Diagonal bracing of the hollow box-shaped wall unit of the exterior wall component; 39 - Vertical cast-in-place wet joint of the exterior wall component; 310 - Horizontal assembly positioning key of the precast slab 31 of the exterior wall component; 311 - Horizontal assembly positioning groove of the precast slab 31 of the exterior wall component; 41 - Longitudinal beam of the base slab component; 42 - Platform slab; 50 - Tie bar between the precast slab and the cast-in-place layer of the exterior wall component; 51 - Assembled bent bolt; 52 - Embedded stirrup in the bent bolt hole; 53 - Bolt operating hand hole; 54 - Positioning keyway; 55 - Local reinforcement cage of the cast-in-place layer in the joint area; 56 - Nut; 57 - Tie bar locking bar; 58 - Waterproof sealing steel plate; 59 - Embedded angle steel; 70 - Wet joint for cast-in-place connection of precast upper or lower slabs in hollow box-type structure; 71 - Reinforcing bar lap joint; 72 - Elastic sealing gasket for bolted joint of precast upper or lower slabs in hollow box-type structure; 73 - Bolts and ducts; 74 - Positioning and shear-resistant keyway; 75 - Prestressed tendons and ducts for prestressed connection of hollow box-type structure; 80 - Cast-in-place wet joint of longitudinal beam; 81 - Temporary splicing steel; 82 - Splicing bolt; 83 - Cold extruded sleeve; 84 - Reinforcing bar of longitudinal beam; 90 - Train; 91 - Exhaust or supply air duct; 92 - Other equipment pipelines.

[0058] Appendix Figure 4 In this context, dimension Wq represents the width of a hollow box-shaped unit. Detailed Implementation

[0059] The following is in conjunction with the appendix Figure 1 To be continued Figure 16 This application will be described in further detail as follows:

[0060] This application discloses a prefabricated subway station. (Refer to...) Figure 1 , Figure 2 , Figure 3 Prefabricated subway stations include a station roof slab assembly 1 and a station middle slab assembly 2, which are hollow box-shaped structures composed of steel web members and precast concrete (PC), stacked exterior wall assemblies 3 on the left and right sides, cast-in-place base slab assembly 4, central column assembly 6, longitudinal beams 18 and 27 in the roof and middle slab assemblies, and 41 and platform slab 42 on the base slab assembly. The composite exterior wall components 3 are arranged opposite each other on both sides of the station and extend along the direction of travel of the train 90. The exterior wall components 3 are three-layer structures. The inner and outer sides of the three-layer structure are precast wall panels 31, and the middle is a cast-in-place concrete composite layer 32. The central column components 6 are steel pipe concrete columns or steel-concrete composite columns. The central column components 6 are arranged at intervals along the direction of travel of the train 90. The longitudinal beams 18, 27 and 41 extend along the direction of travel of the train 90. The station floor slab component 4 is located at the bottom between the opposite exterior wall components 3. Its two ends turn upward and extend upward to connect with the exterior wall components 3. The top slab component 1 and the middle slab component 2 are both hollow box structures. The station top slab component 1 is located at the top between the left and right opposite exterior wall components 3. The station middle slab component 2 is located between the station top slab component 1 and the bottom slab component 4 and is parallel to each other.

[0061] The station roof assembly 1 consists of a prefabricated hollow box-shaped structure and a cast-in-place composite layer 15 located on top of the hollow box-shaped structure. The prefabricated hollow box-shaped structure is assembled from multiple hollow box-shaped units along the train travel direction. Each hollow box-shaped unit is assembled from an upper prefabricated slab 11, a lower prefabricated slab 12, web members 13, and steel diagonal braces 14. The upper prefabricated slab 12 and the lower prefabricated slab 11 are respectively provided with a lower flip beam 17 and an upper flip beam 16. The upper flip beam 16 and the lower flip beam 17 are used to provide connecting bases for the web members 13. The web members 13 are made of fireproof steel pipes or steel-concrete composite members covered with concrete, and their two ends are connected to the upper flip beam 16 and the lower flip beam 17 by bolts. The diagonal braces 14 are inclined between the upper flip beam 16 and the lower flip beam 17, and the diagonal braces 14 are arranged at intervals perpendicular to the train travel direction.

[0062] Reference Figure 3 and Figure 8 The space enclosed by the upper precast slab 12, the lower precast slab 11, and the web members 13 in the roof slab assembly 1 is a hollow box-type unit. In this embodiment, the station roof slab assembly 1 adopts a hollow box-type unit with two boxes; refer to Figure 3 and Figure 7 The station's central panel component 2 adopts a single-compartment hollow box-type unit.

[0063] The composition of the middle slab assembly 2 in the station is similar to that of the top slab assembly 1, except for differences in component dimensions. Figure 1 and Figure 2The main difference is that the part of the station middle plate assembly 1 located on the train track needs to also serve as the rail top heat exhaust duct. The heat exhaust duct needs to meet the requirements of air tightness and fire resistance. Therefore, the space enclosed by the rail top air duct isolation plate 28, the upper precast plate 22, the lower precast plate 21, and the outer wall assembly 3 is set at an appropriate transverse position for the heat exhaust duct.

[0064] Reference Figure 4 , Figure 5 and Figure 6 In this embodiment, the station exterior wall component 3 adopts a three-layer composite structure with a wall thickness of three layers. The two sides consist of precast wall panels 31, with pre-reserved concrete flow holes on the outer side of the precast wall panel. The middle layer is a cast-in-place concrete composite layer 32. The exterior wall component 3 is assembled from multiple repeating hollow box-shaped wall units along the train's direction of travel. During installation, the two precast panels 31, precast webs 33, and steel braces 38 are first bolted together to form hollow box-shaped wall units. Then, the cast-in-place composite layer 32 is poured into the hollow portion of the box-shaped unit. Some of the concrete fills the gap between the outer precast wall panel and the foundation pit retaining wall through the concrete flow holes.

[0065] This application provides two specific implementation methods for a three-layer composite exterior wall assembly:

[0066] The first implementation method of exterior wall component 3 is as follows: Figure 5 and Figure 7 The first step involves assembling precast wall panels 31, precast webs 33, splicing ear plates 37, and steel diagonal braces 38 into a hollow box-shaped wall unit on the ground. At this stage, U-shaped reinforcing bars are pre-installed at both the upper and lower ends of the precast wall panels 31. The upper end of the precast webs 33 is longer than the precast wall panels 31, while the lower end is shorter. The second step involves lifting the hollow box-shaped wall unit assembled in the first step and positioning it to connect with the lower installed hollow box-shaped wall unit or station floor slab assembly 4. U-shaped reinforcing bars 39 are inserted into the lower joint area. The third step involves repeating the second step until the assembled wall reaches a cast-in-place unit. The fourth step involves setting up necessary temporary fixing measures and pouring the intermediate cast-in-place composite layer 32 into the hollow box-shaped wall. The second implementation method for the outer wall assembly 3 is described in reference [reference needed]. Figure 6 The first step involves hoisting the precast wall panel 31 near the outside of the station and bolting it to the station floor slab 4 or the precast wall panel 31 already installed at the bottom, and temporarily fixing it. The second step involves hoisting the precast web 33 and assembling it with the precast wall panel 31 installed in the first step, and temporarily fixing it. The third step involves hoisting another precast wall panel 31 near the inside of the station and assembling it with the components installed in the first two steps to form a hollow box wall unit. The fourth step involves pouring the intermediate cast-in-place layer 32 after a certain number of hollow box wall units have been formed.

[0067] In any of the above-described implementations of the exterior wall component 3, the intermediate cast-in-place composite layer 32 of the exterior wall component 3 is connected to the cast-in-place composite layer 15 of the station roof component 1 at the junction, and is also connected to the base plate component 4.

[0068] This application provides three methods for connecting precast slabs in the station roof slab assembly 1 or the station middle slab assembly 2: The first method involves precast slabs on the upper and lower sections of a hollow box-type structure, as described in the following embodiment. Figure 10 U-shaped steel bars are reserved at the ends of adjacent precast slabs 11 / 12 / 21 / 22 to overlap with each other. Short steel bars are inserted into the overlap area to interlock the U-shaped steel bars, and then cast-in-place concrete is poured.

[0069] Two implementation methods for the upper and lower precast slabs of the hollow box-type structure are described in reference. Figure 11 The first step involves appropriately thickening the ends of precast slabs 11 / 12 / 21 / 22 during prefabrication, and reserving positioning and shear-resistant keyways 74 and bolt holes 73 at the ends. For the upper precast slab 12 of the top slab assembly, a groove for installing elastic sealing gaskets 72 is also reserved. The second step involves pre-attaching elastic sealing gaskets 72 to the upper precast slab 12 of the top slab assembly 1, and hoisting the hollow box-type unit of the middle plate or top plate into place. The third step involves inserting bolts into the reserved bolt holes and tightening them.

[0070] The third implementation method for the hollow box-type structure with precast upper and lower slabs is as follows: Figure 12 The first step involves pre-fabricating prestressed tendon metal pipes and positioning / shear-resistant keyways in precast slabs 11 / 12 / 21 / 22. For precast slabs 12 on top of top slab assembly 1, grooves for installing elastic sealing gaskets 72 are also reserved. The second step involves pre-attaching elastic sealing gaskets 72 to precast slabs 12 on top of top slab assembly 1 and hoisting the hollow box-shaped units of the middle or top slab into place. The third step involves inserting prestressed tendons into the reserved prestressed tendon ducts and tensioning them.

[0071] For the embodiment with central column assembly 6 and longitudinal beams 18 and 27, due to the influence of the internal supports of the station foundation pit, longitudinal beams 18 and 27 are implemented by segmented prefabrication and segmented hoisting, referring to... Figure 13 , Figure 14 and Figure 15 At the segmentation points, steel sections 81 and high-strength bolts 82 are used for temporary splicing, then cold-extruded sleeves 83 are used to connect the main reinforcement of the longitudinal beams, and finally wet joints 80 are poured.

[0072] Reference Figure 15 The longitudinal beam 18 or longitudinal beam 27 has a reserved inner groove for connection with the top plate assembly 1 or the middle plate assembly 2, which serves as a positioning and temporary vertical support. The normal groove depth at the top of the beam is equal to the thickness of the upper precast slab 12 or 22, and a positioning groove for the lower flip beam of the upper precast slab 12 or 22 is reserved. Similarly, the bottom of the longitudinal beam has a reserved assembly groove for the lower precast slab 11 or 21. The vertical top surface of the groove is inclined to facilitate adjustment when inserted into the groove.

[0073] Reference Figure 16For the assembly joints of the precast panels 31 of the station exterior wall component 3, two waterproofing reinforcement measures are adopted. The first is to reserve a groove on the end face of the precast wall panel and attach an elastic sealing gasket 72. The second waterproofing reinforcement measure is optional. The specific implementation method is as follows: Angle steel 59 is embedded at the corner of one side of the end face of the wall panel 31 along both sides of the splice joint. One side of the angle steel is parallel and flush with the end face, and the other side is parallel to the wall surface and recessed into the wall surface to form a local groove. After the precast wall panel 31 is assembled in place, a thin steel plate 58 is welded along the entire length of the embedded angle steel of the splice joint to seal and isolate the assembly joint.

[0074] In the embodiments of this application, an outer waterproof membrane is provided on the bottom surface of the station base plate assembly 4 and the outer side of the outer wall assembly 3, and a waterproof coating is provided on the top surface of the cast-in-place composite layer 15 of the roof plate assembly 1. The above-mentioned waterproof membrane and waterproof coating overlap at the corners in accordance with the specifications, forming a fully enclosed waterproof structure.

[0075] The prefabricated assembly subway station construction method disclosed in the embodiments of this application is as follows:

[0076] Step 1: Construct the retaining structure of the station foundation pit and excavate to the base; at the same time, produce all prefabricated components in the factory; Step 2: Construct the waterproof membrane at the bottom of the station base slab assembly 4, the base slab assembly 4 and the longitudinal beam 41, and for stations with central column assemblies 6, install the central column assemblies 6 and fix the column bases.

[0077] Step 3: First, construct the outer waterproof layer on the outside of the exterior wall component 3. For a three-layer composite exterior wall station, two implementation methods can be used. The first method: when the precast wall panels of exterior wall component 3 refer to Figure 6 When using bolts 51 for connection, install and temporarily fix the outer precast wall panel 31 of the composite wall, and then sequentially hoist the web plate 33 and the inner precast wall panel 31 of the composite wall to assemble a complete hollow box-shaped wall; the second method: when the external wall components refer to Figure 5 When using wet joints, the precast slabs 31, precast webs 33, and steel braces 38 are first assembled into hollow box-shaped wall units on the ground and hoisted into place. Finally, the intermediate cast-in-place composite layer 32 is poured to a certain height to fix the connection of the outer wall components. For stations using cast-in-place outer walls, the formwork is first erected and the cast-in-place outer wall is poured to a position below the station's middle slab. Preferably, when the precast slabs 31 on the outer side of the outer wall component 3 do not have pre-reserved concrete flow holes, grouting pipes are reserved between the waterproof layer and the precast slabs of the composite wall. After the station roof slab component 1 is completed, grouting is used to fill the gap between the waterproof layer of the outer wall and the composite wall.

[0078] Step 4: For stations with central column 6, the longitudinal beams 27 of the station's central slab are hoisted in sections;

[0079] Step 5: Constructing the slab assembly 2, which involves first assembling the upper precast slab, lower precast slabs 22 and 21, and web members 23 into hollow box-shaped units on the ground according to the design, and then hoisting them into place and connecting them with the longitudinal beams 27 and the external wall assembly 3; for the cast-in-place wet joints, wait for the joints to reach the design strength;

[0080] Step 6: Continue construction of the exterior wall component 3 upwards to the position below the lower precast slab 11 of the roof slab component 1; for stations with central column components 6, hoist the longitudinal beams 18 of the station roof slab component in sections;

[0081] Step 7: Construct the hollow box-shaped structure of station roof slab component 1 in the same manner as in Step 5;

[0082] Step 8: Construct the cast-in-place composite layer 15 of the roof slab component 1 of the construction station. The two ends of the composite layer are cast together with the cast-in-place composite layer 32 of the outer wall component 3 to achieve connection.

[0083] Step 9: For a three-layer composite wall station, when a grouting pipe is reserved on the outer side of the precast slab of the outer wall component 3, first grout to fill the gap between the outer wall and the foundation pit retaining wall; construct the waterproof layer and protective layer on the top surface of the composite layer 15 of the top slab, and backfill with soil after acceptance.

[0084] Step 10: Assemble the internal prefabricated structure (such as platform slab 42).

[0085] This application is readily understood by those skilled in the art. The above description is merely a preferred embodiment of this application and is not intended to limit the invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A prefabricated assembled subway station, characterized in that, The application relates to a prefabricated station structure. The application relates to a prefabricated station structure. The application relates to a prefabricated station structure. The application relates to a prefabricated station structure. The application relates to a prefabricated station structure. The application relates to a prefabricated station structure. The application relates to a prefabricated station structure.

2. A precast fabricated subway station as claimed in claim 1 wherein: The application relates to a prefabricated station structure.

3. A precast fabricated subway station as claimed in claim 1, wherein: The application relates to a prefabricated station structure. The application relates to a prefabricated station structure. The application relates to a prefabricated station structure. The application relates to a prefabricated station structure. The application relates to a prefabricated station structure. The application relates to a prefabricated station structure. The application relates to a prefabricated station structure. The application relates to a prefabricated station structure. The application relates to a prefabricated station structure. The application relates to a prefabricated station structure. The application relates to a prefabricated station structure. The application relates to a prefabricated station structure. The application relates to a prefabricated station structure. The application relates to a prefabricated station structure. 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The prefabricated modular subway station according to claim 1, wherein: The upper prefabricated plate and the lower prefabricated plate of the hollow box unit of the roof assembly and the middle plate assembly adopt prestressed plates or ordinary reinforced concrete plates, the web member and the inclined brace between the upper prefabricated plate and the lower prefabricated plate adopt steel pipes or profiled steel or steel-concrete combined members as the connecting members of the upper prefabricated plate and the lower prefabricated plate; the exposed beams are arranged on the connecting positions of the upper prefabricated plate and the lower prefabricated plate of the hollow box unit and the two ends of the web member, the exposed beams are pre-buried with bolt connecting members, and the web member and the upper prefabricated plate and the lower prefabricated plate of the unit are assembled through the bolt connecting members; further, the connection between the upper prefabricated plates or the lower prefabricated plates of the hollow box units adopts cast-in-situ concrete wet connection or bolt connection or prestressed tendon connection.

5. A precast fabricated subway station as claimed in claim 1, wherein: The inclined brace is arranged in the box chamber of the hollow box unit of the roof assembly and the middle plate assembly along the longitudinal direction of the station, i.e. the train running direction, and the inclined brace is arranged at intervals perpendicular to the train running direction.

6. A precast fabricated subway station as claimed in claim 1, wherein: The middle column assembly adopts a steel pipe concrete column or a profiled steel concrete column; further, the structure provided with the middle column assembly adopts a prestressed hollow beam or a solid beam as the longitudinal beam parallel to the train running direction, and the longitudinal beam is hoisted in sections.

7. A precast fabricated subway station as claimed in claim 1, wherein: The upper surface of the upper prefabricated plate of the hollow box unit of the roof assembly of the station is overlaid with a cast-in-situ overlaid layer of reinforced concrete; the upper surface of the upper prefabricated plate of the hollow box unit of the roof assembly of the station is reserved with a tieback tendon; the cast-in-situ overlaid layer on the top surface of the hollow box unit is connected with the cast-in-situ overlaid layer of the outer wall assembly on the two sides of the station at the joint, and further, the cast-in-situ overlaid layer of the outer wall assembly is connected with the bottom plate assembly of the station to form a complete cast-in-situ concrete waterproof layer.

8. A precast fabricated subway station as claimed in claim 1, wherein: The outer side of the outer wall assembly is provided with an outer waterproof coiled material, the cast-in-situ overlaid layer of the roof assembly is coated with waterproof paint, and the bottom surface of the bottom plate assembly is provided with an outer waterproof coiled material, so as to form a complete outer waterproof layer; further, an elastic sealing waterproof structure is arranged at the joint of the outer wall assembly and the roof assembly.

9. A precast fabricated subway station as claimed in claim 1, wherein: The three-layer overlaid wall structure of the outer wall assembly is prefabricated wall plate assembly on the inner and outer sides, prefabricated web plates and steel inclined braces are arranged between the prefabricated wall plates, the prefabricated web plates and the steel inclined braces connect and assemble the inner and outer prefabricated wall plates into a hollow box unit, the prefabricated web plates and the outer prefabricated wall plates are provided with concrete flow holes, so that the concrete can fill the gap between the outer wall assembly and the outer waterproof layer through the reserved holes when pouring the intermediate cast-in-situ overlaid layer.

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