Construction method of subway station

Abstract

The invention belongs to the technical field of subway construction, and discloses a construction method of a subway station. The construction method of the subway station comprises the following steps that a supporting structure is arranged at a to-be-constructed position, and a foundation pit is excavated to a preset depth at the to-be-constructed position; and a foundation unit and a running track are spliced in the foundation pit, and the multiple tunneling devices are hoisted to the running track. And the multiple tunneling devices are controlled to excavate at the same time, so that the foundation unit moves downwards in the vertical direction. And splicing a structural layer on the basic unit. And the multiple tunneling devices are controlled to excavate at the same time, so that the foundation unit and the structural layer move downwards in the vertical direction. And the multiple tunneling devices are hoisted out of the foundation pit. And a foundation structure is constructed at the junction of the foundation unit and the structural layer, and a capping structure is constructed above the structural layer. And when it is judged that the strength grade of each node of the subway station is larger than or equal to the design strength, soil is backfilled, and the ground is leveled. The construction method of the metro station can avoid interference on assembly operation of the metro station, shorten the construction period and improve the working efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of subway construction, and in particular to a construction method for a subway station. Background Art

[0002] In the construction of subway stations, a combination of open-cut and prefabricated construction is often used. This construction method is technically simple and can not only improve construction efficiency and shorten construction period, but also save labor.

[0003] The existing construction method of prefabricated subway stations usually adopts layered excavation of the foundation pit to the design elevation, and four internal supports are set in the foundation pit from top to bottom, wherein the first support is set above the top plate structure, the second is set near the top of the side wall, the third support is set near the middle plate elevation, and the fourth support is set between the bottom plate and the middle plate. Then, the main station structures such as the bottom plate, trolley and side wall blocks of the station are assembled in sequence, and the internal support structure in the foundation pit is removed from bottom to top. When this method is used to construct subway stations, on the one hand, during the construction process, the internal support structure in the foundation pit occupies a large space, and the internal support structure is located above the assembled structure, which will interfere with the assembly operation of the main structure of the station and inconvenience the construction; on the other hand, the internal support structure needs to be disassembled multiple times, and the operation process is cumbersome, which is not only time-consuming and inefficient, but also has a high labor intensity for the staff. Summary of the invention

[0004] The purpose of the present invention is to provide a construction method for a subway station, which can avoid the internal supporting structure from interfering with the assembly operation of the subway station, facilitate the construction, reduce the construction procedures, shorten the construction period and improve the work efficiency.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A construction method for a subway station is provided. The subway station comprises a foundation unit and a main unit stacked vertically, wherein the main unit comprises at least one structural layer. The construction method for the subway station comprises the following steps:

[0007] S1. Setting a support structure at the location to be constructed, and excavating a foundation pit to a preset depth at the location to be constructed;

[0008] S2, assembling the basic unit and the running track in the foundation pit, and hoisting a plurality of excavation equipment onto the running track, wherein the plurality of excavation equipment are arranged at intervals along the horizontal direction of the foundation pit, and the excavation equipment is used to excavate the foundation pit downwards;

[0009] S3, controlling the plurality of excavation devices to dig simultaneously, so that the basic unit moves vertically downward until the upper end of the basic unit is flush with the ground;

[0010] S4, assembling the structural layer on the basic unit;

[0011] S5, controlling the plurality of excavation devices to dig simultaneously, so that the basic unit and the structural layer move vertically downward until the upper end of the structural layer moves downward to a first preset position;

[0012] S6, lifting the plurality of excavation equipment out of the foundation pit;

[0013] S7, constructing a foundation structure at the junction of the foundation unit and the structural layer, wherein the upper end of the foundation structure is flush with the upper end of the foundation unit, and constructing a capping structure above the structural layer, wherein the capping structure is connected to the supporting structure as a whole;

[0014] S8, judging whether the strength level of each node of the subway station is greater than or equal to the design strength, if not, executing S9, if yes, executing S10;

[0015] S9, reinforcing the subway station, and then returning to execute S8;

[0016] S10. Backfill the soil and level the ground.

[0017] Optionally, the structural layer includes a first column, a support beam, a floor plate and a plurality of pipe wall rings, and the plurality of pipe wall rings are stacked vertically, and the step S4 specifically includes the following steps:

[0018] S41, assembling the pipe wall ring on the basic unit until the height of the upper end of the pipe wall ring is greater than or equal to the preset height of the floor plate;

[0019] S42, arranging the first column inside the tube wall ring, and setting up the support beam at the upper end of the first column, wherein the upper end of the support beam is flush with the upper end of the first column, and the support beam is surrounded by a support frame to form a first frame body and a second frame body;

[0020] S43, constructing the floor plate on the first frame, and the second frame is used to connect the inner cavity of the structural layer with the outside.

[0021] Optionally, the pipe wall ring includes a plurality of pipe segments, which are assembled end to end in sequence, and both ends of the pipe segments are respectively provided with connecting grooves and connecting protrusions, and the connecting protrusion of any pipe segment is clamped in the connecting groove of the adjacent pipe segment.

[0022] Optionally, the pipe wall ring further comprises a plug-in connector, and the plug-in connector is vertically penetrated in the pipe segments of the plurality of pipe wall rings;

[0023] and / or,

[0024] The pipe wall ring further comprises a sealing member, and both the outer wall of the connecting protrusion and the inner wall of the connecting groove are provided with the sealing member.

[0025] Optionally, the main body unit includes a plurality of the structural layers, and the plurality of the structural layers are stacked vertically, and the step S4 specifically includes the following steps:

[0026] S44, assembling one of the structural layers on the basic unit;

[0027] S45, controlling the plurality of excavation devices to dig simultaneously, so that the basic unit and the structural layer move vertically downward until the upper end of the structural layer moves downward to be flush with the ground;

[0028] S46, repeating steps S44 and S45 until the assembly of the plurality of structural layers is completed.

[0029] Optionally, the basic unit includes a guide member, a foundation beam, a second column and a plurality of pipe wall rings, the plurality of pipe wall rings are stacked vertically, the second column is arranged inside the pipe wall ring, the foundation beam is arranged at the upper end of the second column, the guide member is arranged at the lower end of the lowest pipe wall ring, and a guide slope is arranged on the side of the guide member close to the inner wall of the foundation pit, the guide slope extends obliquely in a direction close to the inner wall of the foundation pit, and is used to guide the pipe wall ring to move downward.

[0030] Optionally, the support structure includes bored cast-in-place piles and top beams, and step S1 specifically includes the following steps:

[0031] S11, setting the contour line of the foundation pit at the position to be constructed, arranging a plurality of bored cast-in-place piles along the circumference of the foundation pit, the plurality of bored cast-in-place piles are arranged at intervals along the circumference of the foundation pit, and casting the top crown beam on the top of the plurality of bored cast-in-place piles, the top crown beam being connected to the upper ends of the plurality of bored cast-in-place piles;

[0032] S12, excavating the foundation pit downwards along the contour line of the foundation pit to the preset depth.

[0033] Optionally, the step S5 specifically includes the following steps:

[0034] S51, controlling the plurality of excavation devices to dig simultaneously, so that the basic unit and the structural layer move vertically downward until the upper end of the structural layer is flush with the ground;

[0035] S52, erecting an enclosure structure on the structural layer until the height of the enclosure structure is equal to the height difference between a first preset position at the upper end of the structural layer and the ground;

[0036] S53, controlling the plurality of excavation devices to dig simultaneously, so that the basic unit, the structural layer and the enclosure structure move vertically downward until the upper end of the enclosure structure is flush with the ground, and at this time, the upper end of the structural layer moves downward to the first preset position.

[0037] Optionally, the foundation structure includes a sealing layer and a foundation bottom plate, the structural layer includes a first column, a support beam, a floor plate and a plurality of pipe wall rings, the support beams are surrounded to form a support frame, the support frame includes a first frame body and a second frame body, and the step S7 specifically includes the following steps:

[0038] S71, pouring the sealing layer at the junction of the foundation unit and the structural layer to block the foundation unit and the structural layer, and extracting the accumulated water inside the structural layer;

[0039] S72, pouring the foundation slab on the bottom sealing layer, wherein the upper end of the foundation slab is flush with the upper end of the foundation unit;

[0040] S73, setting up the floor slab on the second frame to close the structural layer;

[0041] S74. Construct the capping structure at the upper end of the enclosure structure, wherein the capping structure is connected to the enclosure structure and the supporting structure as a whole.

[0042] Optionally, the step S3 specifically includes the following steps:

[0043] S31, arranging a lifting device along the periphery of the foundation pit, wherein the lifting device is located above the ground and connected to the lower end of the foundation unit;

[0044] S32, controlling the plurality of excavation devices to dig simultaneously, and controlling the lifting device to lower the basic unit, so that the basic unit moves downward evenly in the vertical direction until the upper end of the basic unit is flush with the ground.

[0045] Beneficial effects of the present invention:

[0046] The present invention provides a construction method for a subway station, wherein the subway station includes a foundation unit and a main unit stacked vertically, and the main unit includes at least one structural layer. Both the foundation unit and the structural layer are designed and assembled by an assembled construction method. When the subway station is constructed, a support structure is first set at a location to be constructed, and a foundation pit is excavated to a preset depth. Then, according to a mechanical shaft method, the foundation unit and a running track are assembled in the foundation pit, and a plurality of excavation equipments are hoisted onto the running track, and the plurality of excavation equipments are controlled to excavate simultaneously, so that the foundation unit moves vertically downward until the upper end of the foundation unit is flush with the ground, and then the structural layer is assembled on the foundation unit, and the plurality of excavation equipments are controlled to excavate simultaneously again, so that the foundation unit and the structural layer move vertically downward until the upper end of the structural layer moves downward to a preset position, and then the excavation equipment is hoisted out of the foundation pit, and the foundation structure and the capping structure are constructed and maintained. When the strength grade of each node of the subway station is greater than or equal to the design strength, the soil is backfilled and the ground is leveled.

[0047] The construction method of the subway station combines the mechanical shaft method with the prefabricated construction method. During the excavation of the foundation pit, the various parts of the subway station are assembled. The foundation unit and the structural layer can be used as the internal support structure of the foundation pit, so there is no need to set up the internal support structure in the foundation pit again, which reduces the construction and demolition of the internal support structure, as well as the precipitation construction process. It can not only realize the combination of permanent structure and temporary structure, but also shorten the construction period and improve work efficiency. In addition, the foundation unit and the structural layer are constructed in a digging and assembling manner. The assembly operations are all carried out on the ground. The operation space is large, which can avoid the interference of the support structure on the assembly operation of the subway station and facilitate construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 is a first flow chart of a subway station construction method provided by an embodiment of the present invention;

[0049] Figure 2 is a first flow chart of a subway station construction method provided by an embodiment of the present invention;

[0050] Figure 3 is a cross-sectional view of the construction method of a subway station provided by an embodiment of the present invention when a supporting structure is set;

[0051] Figure 4 It is a plan view of assembling basic units and running tracks of a construction method for a subway station provided by an embodiment of the present invention;

[0052] Figure 5 yes Figure 4 The enlarged view of point A in the middle;

[0053] Figure 6 It is a cross-sectional view of the construction method of a subway station provided by an embodiment of the present invention when assembling a basic unit;

[0054] Figure 7 It is a cross-sectional view of a foundation pit when assembling the first structural layer according to the construction method of a subway station provided by an embodiment of the present invention;

[0055] Figure 8 It is a cross-sectional view of a foundation pit when assembling the second structural layer according to the construction method of a subway station provided by an embodiment of the present invention;

[0056] Fig. 9 It is a cross-sectional view of a foundation pit when a structural layer of a construction method for a subway station provided by an embodiment of the present invention moves down to a first preset position;

[0057] Fig.10 is a side view of a tube wall ring of a subway station provided by an embodiment of the present invention;

[0058] Fig.11 It is a schematic diagram of connecting the pipe segments of the pipe wall ring provided by an embodiment of the present invention.

[0059] In the figure:

[0060] 1. Basic unit; 11. Guide member; 12. Basic beam; 13. Second column;

[0061] 2. Main unit; 21. Structural layer; 211. First column; 212. Support beam; 213. Floor plate; 214. Pipe wall ring; 2141. Pipe segment; 2142. Connecting groove; 2143. Connecting convex head; 2144. Connector;

[0062] 3. Support structure; 31. Bored piles; 32. Top beam;

[0063] 4. Foundation pit;

[0064] 5. Running track;

[0065] 6. Excavation equipment;

[0066] 7. Foundation structure; 71. Sealing layer; 72. Foundation slab;

[0067] 8. Enclosure structure. DETAILED DESCRIPTION

[0068] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0069] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0070] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0071] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0072] like Figures 1 to 11 As shown, this embodiment provides a construction method for a subway station, which can avoid the internal supporting structure from interfering with the assembly operation of the subway station, thereby facilitating construction, and can also reduce construction procedures, shorten the construction period, and improve work efficiency.

[0073] The subway station includes a foundation unit 1 and a main unit 2 stacked vertically, the main unit 2 includes at least one structural layer 21, and the construction method of the subway station includes the following steps:

[0074] S1. See Figure 1 and Figure 3 As shown, a support structure 3 is set at the location to be constructed, and a foundation pit 4 is excavated at the location to be constructed to a preset depth;

[0075] S2. See Figure 1 , Figures 4 to 6As shown, a basic unit 1 and a running track 5 are assembled in a foundation pit 4, and a plurality of excavation equipment 6 are hoisted onto the running track 5. The plurality of excavation equipment 6 are arranged at intervals along the horizontal direction of the foundation pit 4, and the excavation equipment 6 is used to excavate the foundation pit 4 downwards;

[0076] S3. See Figure 1 , Figure 4 and Figure 7 As shown, multiple excavation devices 6 are controlled to dig simultaneously, so that the basic unit 1 moves vertically downward until the upper end of the basic unit 1 is flush with the ground;

[0077] S4. See Figure 1 , Figure 7 and Figure 8 As shown, a structural layer 21 is assembled on the basic unit 1;

[0078] S5. See Figure 1 , Figure 4 and Fig. 9 As shown, multiple excavation devices 6 are controlled to dig simultaneously, so that the basic unit 1 and the structural layer 21 move vertically downward until the upper end of the structural layer 21 moves downward to a preset position;

[0079] S6. See Figure 1 As shown, multiple excavation equipment 6 are hoisted out of the foundation pit 4;

[0080] S7, see Figure 1 and Fig. 9 As shown, a foundation structure 7 is constructed at the junction of the foundation unit 1 and the structural layer 21, the upper end of the foundation structure 7 is flush with the upper end of the foundation unit 1, and a capping structure is constructed above the structural layer 21, and the capping structure is connected to the supporting structure 3 as a whole;

[0081] S8. See Figure 1 As shown, it is determined whether the strength level of each node of the subway station is greater than or equal to the design strength. If not, S9 is executed. If not, S10 is executed.

[0082] S9, reinforce the subway station, and then return to execute S8;

[0083] S10. See Figure 1 As shown, backfill the soil and level the ground.

[0084] In the construction method of the subway station, the foundation unit 1 and the structural layer 21 are both designed and assembled using the prefabricated construction method. When the subway station is constructed, the support structure 3 is first set at the location to be constructed, and the foundation pit 4 is excavated to a preset depth. Then, according to the mechanical shaft method, the foundation unit 1 and the running track 5 are assembled in the foundation pit 4, and multiple excavation equipment 6 are hoisted onto the running track 5. The multiple excavation equipment 6 are controlled to excavate simultaneously, so that the foundation unit 1 moves vertically downward until the upper end of the foundation unit 1 is flush with the ground, and then the structural layer 21 is assembled on the foundation unit 1. The multiple excavation equipment 6 are controlled to excavate simultaneously again, so that the foundation unit 1 and the structural layer 21 move vertically downward until the upper end of the structural layer 21 moves downward to the first preset position, and then the excavation equipment 6 is hoisted out of the foundation pit 4, and the foundation structure 7 and the capping structure are constructed and maintained. When the strength grade of each node of the subway station is greater than or equal to the design strength, the soil is backfilled and the ground is leveled.

[0085] The construction method of the subway station combines the mechanical shaft method with the prefabricated construction method, and the various parts of the subway station are assembled and spliced ​​during the excavation of the foundation pit 4. The basic unit 1 and the structural layer 21 can be used as the internal support structure of the foundation pit, so there is no need to set up the internal support structure in the foundation pit 4 again, reducing the construction and demolition work of the internal support structure, as well as the processes such as precipitation construction, which can not only realize the combination of permanent structure and temporary structure, but also shorten the construction period and improve work efficiency. In addition, the basic unit 1 and the structural layer 21 are constructed in a digging and splicing manner, and the assembly operations are all carried out on the ground. The operation space is large, which can avoid the interference of the support structure with the assembly operation of the subway station, and facilitate construction.

[0086] Exemplarily, the excavation equipment 6 comprises a foundation pit 4 excavator.

[0087] It should be noted that the preset depth and the first preset position are determined based on factors such as the geological conditions of the excavation location of the subway station, the design depth of the subway station, and the specific conditions of the construction site. In this embodiment, the preset depth is set to 3m.

[0088] Alternatively, if Figure 7 As shown, the structural layer 21 includes a first column 211, a support beam 212, a floor plate 213 and a plurality of pipe wall rings 214, and the plurality of pipe wall rings 214 are stacked vertically. The first column 211, the support beam 212, the floor plate 213 and the pipe wall ring 214 are all prefabricated in the factory in advance and assembled into the structural layer 21 of the subway station using an assembled construction method, which can reduce on-site construction time, shorten the construction period and improve work efficiency.

[0089] Step S4 specifically includes the following steps:

[0090] S41, see Figure 2 and Figure 7As shown, the pipe wall ring 214 is assembled on the basic unit 1 until the height of the upper end of the pipe wall ring 214 is greater than or equal to the preset height of the floor plate 213;

[0091] S42, see Figure 2 and Figure 7 As shown, a first column 211 is arranged inside the pipe wall ring 214, and a support beam 212 is set up at the upper end of the first column 211, the upper end of the support beam 212 is flush with the upper end of the first column 211, and a support frame is formed by the support beam 212, and the support frame includes a first frame body and a second frame body;

[0092] S43, see Figure 2 and Figure 7 As shown, a floor plate 213 is set on the first frame, and the second frame is used to connect the inner cavity of the structural layer 21 with the outside.

[0093] Among them, the preset height of the floor plate 213 is the height of the structural layer 21 of the subway station. By controlling the upper end height of the pipe wall ring 214 to be greater than or equal to the preset height of the floor plate 213, it can be ensured that when the basic unit 1 and the structural layer 21 move downward, the pipe wall ring 214 always abuts against the inner wall of the foundation pit 4, so that the pipe wall ring 214 provides support for the station, ensures the overall stability of the foundation pit 4, avoids the collapse of the foundation pit 4, and protects the surrounding environment. In addition, the floor plate 213 is only set up on the first frame, and the second frame is reserved to provide a transportation channel for the entry and exit of equipment, which is convenient for the construction of the subway station.

[0094] It should be noted that the preset height is determined based on factors such as the geological conditions of the subway station excavation location, the design depth of the subway station, and the specific conditions of the construction site.

[0095] Alternatively, if Fig.10 and Fig.11 As shown, the pipe wall ring 214 includes a plurality of pipe segments 2141. The plurality of pipe segments 2141 are assembled end to end in sequence, and connecting grooves 2142 and connecting protrusions 2143 are respectively provided at both ends of the pipe segments 2141. The connecting protrusion 2143 of any pipe segment 2141 is clamped in the connecting groove 2142 of its adjacent pipe segment 2141. When assembling the pipe wall ring 214, the staff uses the lifting equipment to lift the pipe segments 2141 one by one onto the basic unit 1, and assemble them one by one according to the design shape of the subway station, and clamp the connecting protrusion 2143 of the pipe segment 2141 in the connecting groove 2142 of its adjacent pipe segment 2141. The pipe wall ring 214 is surrounded by a plurality of pipe segments 2141, and the structure is simple and easy to operate.

[0096] It should be noted that the junction of any two adjacent pipe segments 2141 forms an assembly line. The structural layer 21 includes a plurality of pipe wall rings 214. In this embodiment, the assembly lines of two adjacent pipe wall rings 214 are arranged at intervals in the horizontal direction, that is, staggered, so as to increase the firmness and stability of the pipe wall rings 214.

[0097] Exemplarily, the structural layer 21 includes three pipe wall rings 214. In other embodiments, two or more pipe wall rings 214 may be provided according to actual engineering requirements, which is not limited herein.

[0098] Alternatively, if Fig.10 and Fig.11 As shown, the pipe wall ring 214 also includes a plug-in connector 2144. The plug-in connector 2144 is vertically inserted into the pipe segments 2141 of the plurality of pipe wall rings 214, and each pipe segment 2141 is provided with a plug-in hole. When the plurality of pipe wall rings 214 are assembled vertically, the plug-in holes of any two pipe wall rings 214 adjacent vertically need to be aligned. After the pipe wall rings 214 are assembled, the plug-in connector 214 penetrates the plurality of pipe wall rings 214 from top to bottom. By providing the plug-in connector 214, the connection strength between the adjacent pipe wall rings 214 can be increased, and the overall rigidity and stability of the structural layer 21 can be improved.

[0099] Illustratively, connector 2144 includes a bolt.

[0100] Optionally, the pipe wall ring 214 further includes a seal. The outer wall of the connecting protrusion 2143 and the inner wall of the connecting groove 2142 are both provided with a seal. When assembling multiple pipe segments 2141, the seal on the connecting protrusion 2143 of any pipe segment 2141 fits tightly with the seal in the connecting groove 2142 of its adjacent pipe segment 2141, which can improve the tightness of the connection between the pipe segments 2141 and prevent groundwater from entering the pipe wall ring 214, thereby avoiding damage to the main structure of the subway station.

[0101] Illustratively, the seal comprises a water-swellable rubber strip.

[0102] Optionally, the main unit 2 includes a plurality of structural layers 21, and the plurality of structural layers 21 are stacked vertically. Step S4 specifically includes the following steps:

[0103] S44, see Figure 2 , Figure 8 and Fig. 9 As shown, a structural layer 21 is assembled on the basic unit 1;

[0104] S45, controlling the multiple excavation devices 6 to dig simultaneously, so that the basic unit 1 and the structural layer 21 move vertically downward until the upper end of the structural layer 21 moves downward to be flush with the ground;

[0105] S46, repeat steps S44 and S45 until the assembly of multiple structural layers 21 is completed.

[0106] When a subway station is provided with a plurality of structural layers 21, first a structural layer 21 is assembled on the basic unit 1, and then the excavation equipment 6 is controlled to excavate the foundation pit 4, so that the basic unit 1 and the assembled structural layer 21 are moved vertically downward until the upper end of the structural layer 21 moves down to be flush with the ground, thereby enabling the assembly operation of the next structural layer 21 to be carried out above the ground, with a larger operating space, which is convenient for construction. Then the excavation equipment 6 is controlled to excavate the foundation pit 4 again, and the above operation is repeated until all the structural layers 21 are assembled. The assembly of all the structural layers 21 is carried out above the ground, avoiding interference of existing facilities with the assembly operation and facilitating construction.

[0107] In this embodiment, two structural layers 21 are provided. In other embodiments, one or more structural layers 21 may be provided according to actual needs, which is not limited here.

[0108] Alternatively, if Figure 4 and Figure 7 As shown, the basic unit 1 includes a guide member 11, a foundation beam 12, a second column 13 and a plurality of pipe wall rings 214. The plurality of pipe wall rings 214 are stacked vertically, the second column 13 is arranged inside the pipe wall ring 214, the foundation beam 12 is arranged at the upper end of the second column 13, and the guide member 11 is arranged at the lower end of the lowest pipe wall ring 214. A guide slope is arranged on one side of the guide member 11 close to the inner wall of the foundation pit 4. The guide slope extends obliquely in a direction close to the inner wall of the foundation pit 4, and is used to guide the pipe wall ring 214 to move downward. When assembling the foundation unit 1, firstly, the guide member 11 is arranged along the circumference of the foundation pit 4, and then the pipe wall ring 214 is assembled vertically on the guide until the upper end of the pipe wall ring 214 is flush with the second preset position of the foundation beam 12, and then the second column 13 is arranged inside the pipe wall ring 214, and the foundation beam 12 is assembled at the upper end of the second column 13. The foundation beam 12 and the second column 13 cooperate to provide lateral support for the foundation pit 4, ensure the stability of the foundation pit 4, and prevent the foundation pit 4 from collapsing. When controlling the excavation equipment 6 to excavate, the guide slope of the guide member 11 is inserted into the soil layer at the bottom of the foundation pit 4, which can reduce the sinking resistance of the foundation unit 1 when it moves downward, and can guide the pipe wall ring 214 to move downward.

[0109] Exemplarily, the guide 11 comprises a steel bevel.

[0110] It should be noted that the second preset position is determined based on factors such as the geological conditions of the subway station excavation location, the design depth of the subway station, and the specific conditions of the construction site.

[0111] Alternatively, if Figure 3As shown, the support structure 3 includes bored piles 31 and top beams 32. Step S1 specifically includes the following steps:

[0112] S11, setting the outline of the foundation pit 4 at the location to be constructed, arranging a plurality of bored cast-in-place piles 31 along the circumference of the foundation pit 4, the plurality of bored cast-in-place piles 31 are arranged at intervals along the circumference of the foundation pit 4, and pouring a crown beam 32 on the top of the plurality of bored cast-in-place piles 31, the crown beam 32 is connected to the upper ends of the plurality of bored cast-in-place piles 31;

[0113] S12, excavating the foundation pit 4 downwards along the contour line of the foundation pit 4 to a preset depth.

[0114] By arranging a plurality of bored piles 31 around the foundation pit 4, the load can be transferred to the deep ground, significantly enhancing the bearing capacity of the ground, thereby ensuring the overall stability of the main structure of the subway station. In addition, a crown beam 32 is cast on the top of the bored pile 31, so that the crown beam 32 is connected to the upper end of the bored pile 31, so that the crown beam 32 and the bored pile 31 are connected as a whole to form an integral support system, which can enhance the synergy between the bored piles 31, improve the overall support effect, ensure the stability and safety of the support system, and the crown beam 32 can disperse the load to prevent the bored pile 31 from deforming or sinking.

[0115] Optionally, step S5 specifically includes the following steps:

[0116] S51, see Figure 2 , Figure 4 and Figure 8 As shown, multiple excavation devices 6 are controlled to dig simultaneously, so that the basic unit 1 and the structural layer 21 move vertically downward until the upper end of the structural layer 21 is flush with the ground;

[0117] S52, see Figure 2 , Figure 4 and Fig. 9 As shown, a containment structure 8 is set up on the structural layer 21 until the height of the containment structure 8 is equal to the height difference between the first preset position at the upper end of the structural layer 21 and the ground;

[0118] S53, see Figure 2 , Figure 4 and Fig. 9 As shown, multiple excavation equipment 6 are controlled to dig simultaneously so that the basic unit 1, the structural layer 21 and the enclosure structure 8 move vertically downward until the upper end of the enclosure structure 8 is flush with the ground. At this time, the upper end of the structural layer 21 moves down to a preset position.

[0119] It is known that the entire subway station needs to be buried below the ground. When the structural layer 21 of the subway station moves down until its upper end is flush with the ground, the structural layer 21 needs to continue to move down so that the upper end of the structural layer 21 is located at the first preset position. By setting the enclosure structure 8 on the structural layer 21, it can be ensured that during the downward movement of the structural layer 21, the enclosure structure 8 is always in contact with the inner wall of the foundation pit 4, which is used to provide lateral support for the foundation pit 4, ensure the stability of the foundation pit 4, and prevent the foundation pit 4 from collapsing. In addition, setting the overall height of the enclosure structure 8 to the height difference between the first preset position of the upper end of the structural layer 21 and the ground can ensure that when the upper end of the enclosure structure 8 is flush with the ground, the structural layer 21 just moves down to the first preset position.

[0120] In this embodiment, the enclosure structure 8 includes two pipe wall rings 214. In other embodiments, the enclosure structure 8 may be configured as one or more than two pipe wall rings 214 according to actual needs, which is not limited here.

[0121] Alternatively, if Fig. 9 As shown, the basic structure 7 includes a bottom cover 71 and a base bottom plate 72. Step S7 specifically includes the following steps:

[0122] S71, see Figure 2 and Fig. 9 As shown, a sealing layer 71 is poured at the junction of the basic unit 1 and the structural layer 21 to block the basic unit 1 and the structural layer 21 and to extract the accumulated water inside the structural layer 21;

[0123] S72, see Figure 2 and Fig. 9 As shown, a foundation bottom plate 72 is cast on the bottom cover 71, and the upper end of the foundation bottom plate 72 is flush with the upper end of the foundation unit 1;

[0124] S73, erecting a floor plate 213 on the second frame to close the structural layer 21;

[0125] S74. Construct a capping structure at the upper end of the enclosure structure 8. The capping structure is connected to the enclosure structure 8 and the supporting structure 3 as a whole.

[0126] By pouring the sealing layer 71, it is not only possible to achieve the water-proof effect on the bottom of the foundation pit 4 and resist the foundation reaction force after pumping, but also to compensate for the error of earth excavation, level the construction site, ensure that the bottom surface of the foundation is evenly stressed, and provide a flat and firm construction platform for the subsequent construction of the foundation slab 72, which is convenient for the subsequent construction of the foundation slab 72, the foundation template support, and the steel bar binding operations, which helps to improve the construction efficiency and reduce the errors and rework in the construction process. The foundation slab 72 is set on the sealing layer 71. The sealing layer 71 can not only prevent the erosion of the foundation slab 72 by groundwater, effectively prevent the upward penetration of groundwater, and ensure the durability of the foundation structure 7; it can also buffer the load transmitted from the structural layer 21 to the foundation unit 1, and prevent the foundation from being excessively deformed or damaged. In addition, the capping structure is connected to the enclosure structure 8 and the supporting structure 3 as a whole, which further improves the supporting role of the supporting structure 3 on the subway station, meets the vertical support and pull-out requirements of the subway station, and ensures the overall stability of the subway station.

[0127] Optionally, step S3 specifically includes the following steps:

[0128] S31, a lifting device is arranged along the four sides of the foundation pit, and the lifting device is located above the ground, and the lifting device is connected to the lower end of the foundation unit 1;

[0129] S32, controlling a plurality of excavation devices 6 to dig simultaneously, and controlling the lifting device to lower the foundation unit 1 at the same time, so that the foundation unit 1 moves downward evenly in the vertical direction until the upper end of the foundation unit 1 is flush with the ground.

[0130] When performing step S3, first, a lifting device is arranged on the side of the foundation pit 4, and the lifting device is connected to the lower end of the foundation unit 1. Then, the excavation equipment 6 is controlled to carry out excavation, and at the same time, the lifting device is controlled to lower the foundation unit 1. This can ensure that the foundation unit 1 always moves downward evenly in the vertical direction, prevent the foundation unit 1 from tilting and shifting, causing the entire subway station to tilt, and ensure the overall stability of the main structure of the subway station.

[0131] Illustratively, the lifting device comprises a crane.

[0132] It should be noted that, after the subway station is moved down as a whole, the connection between the lifting device and the basic unit 1 will be removed by the staff.

[0133] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A method for constructing a subway station, the subway station comprising a foundation unit (1) and a main unit (2) stacked vertically, the main unit (2) comprising at least one structural layer (21), characterized in that: The construction method of the subway station comprises the following steps: S1. Setting a support structure (3) at a location to be constructed, and excavating a foundation pit (4) at the location to be constructed to a preset depth; S2, assembling the basic unit (1) and the running track (5) in the foundation pit (4), and hoisting a plurality of excavation equipment (6) onto the running track (5), wherein the plurality of excavation equipment (6) are arranged at intervals in the horizontal direction of the foundation pit (4), and the excavation equipment (6) is used to excavate the foundation pit (4) downwards; S3, controlling the plurality of excavation devices (6) to dig simultaneously, so that the base unit (1) moves vertically downward until the upper end of the base unit (1) is flush with the ground; S4, assembling the structural layer (21) on the basic unit (1); S5, controlling the plurality of excavation devices (6) to dig simultaneously, so that the basic unit (1) and the structural layer (21) move vertically downward until the upper end of the structural layer (21) moves downward to a first preset position; S6, lifting the plurality of excavation equipment (6) out of the foundation pit (4); S7, constructing a foundation structure (7) at the junction of the foundation unit (1) and the structural layer (21), wherein the upper end of the foundation structure (7) is flush with the upper end of the foundation unit (1), and constructing a capping structure above the structural layer (21), wherein the capping structure is connected to the supporting structure (3) as a whole; S8, judging whether the strength level of each node of the subway station is greater than or equal to the design strength, if not, executing S9, if yes, executing S10; S9, reinforcing the subway station, and then returning to execute S8; S10. Backfill the soil and level the ground.

2. The construction method of a subway station according to claim 1, characterized in that: The structural layer (21) comprises a first column (211), a support beam (212), a floor plate (213) and a plurality of pipe wall rings (214), wherein the plurality of pipe wall rings (214) are stacked vertically, and the step S4 specifically comprises the following steps: S41, assembling the pipe wall ring (214) on the basic unit (1) until the height of the upper end of the pipe wall ring (214) is greater than or equal to a preset height of the floor plate (213); S42, arranging the first column (211) inside the tube wall ring (214), and setting up the support beam (212) at the upper end of the first column (211), the upper end of the support beam (212) being flush with the upper end of the first column (211), and forming a support frame surrounded by the support beam (212), the support frame comprising a first frame body and a second frame body; S43, constructing the floor plate (213) on the first frame, and the second frame is used to connect the inner cavity of the structural layer (21) with the outside.

3. The construction method of a subway station according to claim 2, characterized in that: The pipe wall ring (214) comprises a plurality of pipe segments (2141), wherein the plurality of pipe segments (2141) are assembled end to end in sequence, and connecting grooves (2142) and connecting protrusions (2143) are respectively provided at both ends of the pipe segments (2141), and the connecting protrusions (2143) of any pipe segment (2141) are clamped in the connecting grooves (2142) of the adjacent pipe segments (2141).

4. The construction method of a subway station according to claim 3, characterized in that: The pipe wall ring (214) further comprises a plug-in connector (2144), wherein the plug-in connector (2144) is vertically inserted into the pipe segments (2141) of the plurality of pipe wall rings (214); and / or, The tube wall ring (214) further comprises a sealing member, and the outer wall of the connecting protrusion (2143) and the inner wall of the connecting groove (2142) are both provided with the sealing member.

5. The construction method of a subway station according to any one of claims 1 to 4, characterized in that: The main body unit (2) comprises a plurality of structural layers (21), and the plurality of structural layers (21) are stacked vertically. The step S4 specifically comprises the following steps: S44, assembling one of the structural layers (21) on the basic unit (1); S45, controlling the plurality of excavation devices (6) to dig simultaneously, so that the basic unit (1) and the structural layer (21) move vertically downward until the upper end of the structural layer (21) moves downward to be flush with the ground; S46, repeating steps S44 and S45 until the assembly of the plurality of structural layers (21) is completed.

6. The construction method of a subway station according to any one of claims 1 to 4, characterized in that: The basic unit (1) comprises a guide member (11), a foundation beam (12), a second column (13) and a plurality of pipe wall rings (214); the plurality of pipe wall rings (214) are stacked vertically; the second column (13) is arranged inside the pipe wall ring (214); the foundation beam (12) is arranged at the upper end of the second column (13); the guide member (11) is arranged at the lower end of the lowest pipe wall ring (214); a guide slope is arranged on one side of the guide member (11) close to the inner wall of the foundation pit (4); the guide slope extends obliquely in a direction close to the inner wall of the foundation pit (4) and is used to guide the pipe wall ring (214) to move downward.

7. The construction method of a subway station according to any one of claims 1 to 4, characterized in that: The support structure (3) comprises bored cast-in-place piles (31) and top beams (32), and the step S1 specifically comprises the following steps: S11, setting the outline of the foundation pit (4) at the location to be constructed, arranging a plurality of bored cast-in-place piles (31) along the circumference of the foundation pit (4), the plurality of bored cast-in-place piles (31) being arranged at intervals along the circumference of the foundation pit (4), and casting the top crown beam (32) on the top of the plurality of bored cast-in-place piles (31), the top crown beam (32) being connected to the upper ends of the plurality of bored cast-in-place piles (31); S12, excavating the foundation pit (4) downwards along the contour line of the foundation pit (4) to the preset depth.

8. The method for constructing a subway station according to any one of claims 1 to 4, characterized in that: The step S5 specifically comprises the following steps: S51, controlling the plurality of excavation devices (6) to dig simultaneously, so that the basic unit (1) and the structural layer (21) move vertically downward until the upper end of the structural layer (21) is flush with the ground; S52, erecting an enclosure structure (8) on the structural layer (21) until the height of the enclosure structure (8) is equal to the height difference between a first preset position at the upper end of the structural layer (21) and the ground; S53, controlling the plurality of excavation devices (6) to dig simultaneously, so that the base unit (1), the structural layer (21) and the enclosure structure (8) move vertically downward until the upper end of the enclosure structure (8) is flush with the ground, at which time the upper end of the structural layer (21) moves downward to the first preset position.

9. The construction method of a subway station according to claim 8, characterized in that: The foundation structure (7) comprises a sealing layer (71) and a foundation bottom plate (72), the structural layer (21) comprises a first column (211), a support beam (212), a floor plate (213) and a plurality of pipe wall rings (214), the support beam (212) is surrounded to form a support frame, the support frame comprises a first frame body and a second frame body, and the step S7 specifically comprises the following steps: S71, pouring the sealing layer (71) at the junction of the foundation unit (1) and the structural layer (21) to block the foundation unit (1) and the structural layer (21), and extracting the accumulated water inside the structural layer (21); S72, pouring the foundation bottom plate (72) on the bottom cover layer (71), wherein the upper end of the foundation bottom plate (72) is flush with the upper end of the foundation unit (1); S73, laying the floor plate (213) on the second frame to close the structural layer (21); S74. Constructing the capping structure at the upper end of the enclosure structure (8), wherein the capping structure is connected to the enclosure structure (8) and the supporting structure (3) as a whole.

10. The construction method of a subway station according to any one of claims 1 to 4, characterized in that: The step S3 specifically comprises the following steps: S31, a lifting device is arranged along the periphery of the foundation pit (4), and the lifting device is located above the ground, and the lifting device is connected to the lower end of the foundation unit (1); S32, controlling the plurality of excavation devices (6) to dig simultaneously, and controlling the lifting device to lower the base unit (1) so that the base unit (1) moves downward evenly in the vertical direction until the upper end of the base unit (1) is flush with the ground.

Images