A construction method of a subway station

Abstract

The application 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: a support structure is arranged at a position to be constructed, and a foundation pit is excavated to a preset depth at the position to be constructed; a foundation unit and a running track are spliced in the foundation pit, and multiple tunneling devices are hoisted onto the running track; the multiple tunneling devices are controlled to excavate simultaneously, so that the foundation unit moves downward along a vertical direction; a structure layer is spliced on the foundation unit; the multiple tunneling devices are controlled to excavate simultaneously, so that the foundation unit and the structure layer move downward along the vertical direction; the multiple tunneling devices are hoisted out of the foundation pit; a foundation structure is constructed at the junction of the foundation unit and the structure layer, and a capping structure is constructed above the structure layer; when it is judged that the strength grade of each node of the subway station is greater than or equal to the design strength, backfilling is performed to cover the soil and the ground is leveled. The construction method of the subway station can avoid interfering with the splicing operation of the subway station, shorten the construction period, and improve the work efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of subway construction, in particular to a construction method of a subway station. BACKGROUND

[0002] In the construction of a subway station, a combined method of open excavation and assembly is often used. This method is simple in technology, can improve construction efficiency, shorten construction period, and save labor.

[0003] The existing construction method of an assembly-type subway station usually involves excavating a foundation pit to a design elevation in layers, and then setting four internal supports in the foundation pit from top to bottom. The first support is set above the roof structure, the second support 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 structure of the station, such as the bottom plate, the trolley, and the side wall block, is assembled in sequence, and the internal support structure in the foundation pit is removed from bottom to top in sequence. This method has the following problems. On the one hand, the internal support structure in the foundation pit occupies a large space and is located above the assembled structure, which interferes with the assembly operation of the main structure of the station and is inconvenient for construction. On the other hand, the internal support structure needs to be removed multiple times, which is complicated, time-consuming, low in efficiency, and labor-intensive. SUMMARY

[0004] The present application aims to provide a construction method of a subway station, which can avoid the interference of the internal support structure with the assembly operation of the subway station, facilitate construction, reduce the construction process, shorten the construction period, and improve the work efficiency.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] The present application provides a construction method of a subway station. The subway station includes a foundation unit and a main unit stacked along the vertical direction. The main unit includes at least one structural layer. The construction method of the subway station includes the following steps:

[0007] S1. A support structure is set at a to-be-constructed position, and a foundation pit is excavated to a preset depth at the to-be-constructed position;

[0008] S2. The foundation unit and the running track are assembled in the foundation pit, and multiple tunneling equipment is hoisted onto the running track. The multiple tunneling equipment is arranged at intervals along the horizontal direction of the foundation pit, and is used to excavate the foundation pit downward;

[0009] S3. The multiple tunneling equipment is controlled to excavate simultaneously, so that the foundation unit moves downward along the vertical direction until the upper end of the foundation unit is flush with the ground;

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

[0011] S5, controlling multiple tunneling devices to excavate simultaneously, so that the foundation unit and the structural layer move downward along the vertical direction until the upper end of the structural layer moves to the first preset position;

[0012] S6, hoisting multiple tunneling devices out of the foundation pit;

[0013] S7, constructing a foundation structure at the junction of the foundation unit and the structural layer, the upper end of the foundation structure being flush with the upper end of the foundation unit, and constructing a capping structure above the structural layer, the capping structure being connected to the support structure integrally;

[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, backfilling and grading the ground.

[0017] Optionally, the structural layer comprises first columns, support beams, floor plates, and multiple pipe wall rings, multiple pipe wall rings being stacked vertically, and the step S4 specifically comprises the following steps:

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

[0019] S42, arranging the first columns inside the pipe wall rings, and arranging the support beams on the upper ends of the first columns, the upper ends of the support beams being flush with the upper ends of the first columns, a support frame being formed by surrounding the support beams, the support frame comprising a first frame body and a second frame body;

[0020] S43, arranging the floor plates on the first frame body, and the second frame body being used to communicate the inner cavity of the structural layer with the outside.

[0021] Optionally, the pipe wall ring comprises multiple pipe pieces, multiple pipe pieces being sequentially and end-to-end assembled, both ends of the pipe piece being respectively provided with a connecting groove and a connecting protrusion, and the connecting protrusion of any pipe piece being clamped in the connecting groove of the adjacent pipe piece.

[0022] Optionally, the pipe wall ring further comprises a plug-in piece, the plug-in piece being vertically arranged in the pipe pieces of multiple pipe wall rings;

[0023] and / or,

[0024] The pipe wall ring further comprises a sealing member, and 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 unit comprises a plurality of structural layers stacked vertically, and the step S4 specifically comprises the following steps:

[0026] S44, assembling a structural layer on the base unit;

[0027] S45, controlling a plurality of tunneling devices to excavate simultaneously, so that the base unit and the structural layer move downward vertically until the upper end of the structural layer moves to the ground level;

[0028] S46, repeating steps S44 and S45 until the plurality of structural layers are assembled.

[0029] Optionally, the base unit comprises a guide member, a base 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 base beam is arranged at the upper end of the second column, the guide member is arranged at the lower end of the lowermost pipe wall ring, and the guide member is provided with a guide inclined surface close to one side of the inner wall of the foundation pit, the guide inclined surface extends obliquely in the 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 comprises a bored pile and a top beam, and the step S1 specifically comprises the following steps:

[0031] S11, setting a contour line of the foundation pit at the to-be-constructed position, arranging a plurality of bored piles along the contour line of the foundation pit, the plurality of bored piles being arranged at intervals along the contour line of the foundation pit, and pouring the top beam at the top of the plurality of bored piles, the top beam being connected with the upper ends of the plurality of bored piles;

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

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

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

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

[0036] S53, control the multiple tunneling equipment to excavate simultaneously, so that the foundation unit, the structure layer and the enclosure structure move downward along the vertical direction until the upper end of the enclosure structure is flush with the ground, at this time the upper end of the structure layer moves to the first preset position.

[0037] Optionally, the foundation structure comprises a bottom sealing layer and a foundation bottom plate, the structure layer comprises a first column, a support beam, a floor plate and a plurality of pipe wall rings, a support frame is formed by surrounding the support beam, the support frame comprises a first frame body and a second frame body, and the step S7 specifically comprises the following steps.

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

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

[0040] S73, erecting the floor plate on the second frame body to close the structure layer;

[0041] S74, constructing the roof structure on the upper end of the enclosure structure, and the roof structure is connected with the enclosure structure and the support structure integrally.

[0042] Optionally, the step S3 specifically comprises the following steps.

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

[0044] S32, controlling multiple tunneling equipment to excavate simultaneously, and simultaneously controlling the lifting device to lower the foundation unit, so that the foundation unit moves downward along the vertical direction uniformly until the upper end of the foundation unit is flush with the ground.

[0045] The beneficial effects of the present application are as follows:

[0046] The application provides a construction method of a subway station. The subway station comprises a foundation unit and a main body unit stacked in a vertical direction. The main body unit comprises at least one structural layer. The foundation unit and the structural layer are designed and assembled by using an assembly type construction method. When the subway station is constructed, a support structure is arranged at a position to be constructed, and a foundation pit is excavated to a preset depth. Then, the foundation unit and a running track are assembled and installed in the foundation pit according to a mechanical shaft method. A plurality of tunneling equipment is hoisted to the running track, and the plurality of tunneling equipment is controlled to excavate simultaneously, so that the foundation unit moves downward in the vertical direction until the upper end of the foundation unit is flush with the ground. Then, the structural layer is assembled and installed on the foundation unit, and the plurality of tunneling equipment is controlled to excavate simultaneously, so that the foundation unit and the structural layer move downward in the vertical direction until the upper end of the structural layer moves to a preset position. Then, the tunneling 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 backfilling and the ground leveling are performed.

[0047] The construction method of the subway station combines the mechanical shaft method with the assembly type construction method. In the process of excavating the foundation pit, the assembly and installation of each part of the subway station are performed. The foundation unit and the structural layer can be used as the internal support structure of the foundation pit, so that it is not necessary to arrange the internal support structure in the foundation pit again, thereby reducing the construction and removal of the internal support structure, and reducing the processes such as the dewatering construction. The combination of the permanent structure and the temporary structure can shorten the construction period and improve the work efficiency. In addition, the foundation unit and the structural layer are constructed by using the method of excavating and assembling simultaneously, and the assembly operation is performed on the ground, so that the operation space is large, the interference of the support structure on the assembly operation of the subway station can be avoided, and the construction is facilitated. BRIEF DESCRIPTION OF DRAWINGS

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

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

[0050] Figure 3 is a cross-sectional view of the construction method of the subway station provided by the embodiment of the application when the support structure is arranged;

[0051] Figure 4 is a plan view of the construction method of the subway station provided by the embodiment of the application when the foundation unit and the running track are assembled;

[0052] Figure 5 is Figure 4 is an enlarged view of A in FIG. 8;

[0053] Figure 6 is a cross-sectional view of the construction method of the subway station provided by the embodiment of the application when the foundation unit is assembled;

[0054] Figure 7 is a profile view of a foundation pit when a first structural layer is assembled in the construction method of a subway station provided by the embodiment of the present application;

[0055] Figure 8 is a profile view of a foundation pit when a second structural layer is assembled in the construction method of a subway station provided by the embodiment of the present application;

[0056] Figure 9 is a profile view of a foundation pit when a structural layer is moved to a first preset position in the construction method of a subway station provided by the embodiment of the present application;

[0057] Figure 10 is a side view of a pipe wall ring provided by the embodiment of the present application;

[0058] Figure 11 is a connection schematic view of a pipe piece of a pipe wall ring provided by the embodiment of the present application.

[0059] In the drawings:

[0060] 1, base unit; 11, guide; 12, base beam; 13, second stand column;

[0061] 2, main body unit; 21, structural layer; 211, first stand column; 212, support beam; 213, floor plate; 214, pipe wall ring; 2141, pipe piece; 2142, connection groove; 2143, connection convex head; 2144, plug-in piece;

[0062] 3, support structure; 31, bored pile; 32, top crown beam;

[0063] 4, foundation pit;

[0064] 5, running track;

[0065] 6, tunneling equipment;

[0066] 7, base structure; 71, bottom sealing layer; 72, base bottom plate;

[0067] 8, fence structure. DETAILED DESCRIPTION

[0068] The present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, but not all the structures.

[0069] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0070] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0071] In the description of the present embodiment, the terms "up", "down", "left", "right" and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only used to distinguish in description and have no special meaning.

[0072] As shown in Figures 1 to 11 , the present embodiment provides a construction method of a subway station, which can not only avoid the interference of internal support structure with the assembly operation of the subway station, facilitate construction, but also reduce the construction process, shorten the construction period and improve the work efficiency.

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

[0074] S1, as shown in Figure 1 and Figure 3 , a support structure 3 is arranged at a to-be-constructed position, and a foundation pit 4 is excavated to a preset depth at the to-be-constructed position;

[0075] S2, as shown in Figure 1 , Figures 4 to 6As shown, the foundation unit 1 and the running track 5 are assembled in the 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. 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 Figure 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 Figure 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. A capping structure is constructed above the structural layer 21. 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, execute S9; if not, execute S10;

[0082] S9, reinforce the subway station, and then return to 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 structure layer 21 are designed and assembled by using the assembly construction method. When the subway station is constructed, first, the support structure 3 is arranged at the position to be constructed, and the foundation pit 4 is excavated to a preset depth, then the foundation unit 1 and the running track 5 are assembled and assembled in the foundation pit 4 according to the mechanical shaft method, and the plurality of tunneling equipment 6 is hoisted to the running track 5, the plurality of tunneling equipment 6 is controlled to excavate simultaneously, the foundation unit 1 is moved downward along the vertical direction until the upper end of the foundation unit 1 is flush with the ground, then the structure layer 21 is assembled and assembled on the foundation unit 1, the plurality of tunneling equipment 6 is controlled to excavate simultaneously, the foundation unit 1 and the structure layer 21 are moved downward along the vertical direction until the upper end of the structure layer 21 is moved to a first preset position, then the tunneling equipment 6 is hoisted out of the foundation pit 4, the foundation structure 7 and the capping structure are constructed and maintained, and when the strength level of each node of the subway station is greater than or equal to the design strength, the backfilling and the ground leveling are performed.

[0085] The construction method of the subway station combines the mechanical shaft method with the assembly construction method, and assembles and assembles each part of the subway station during the excavation of the foundation pit 4. The foundation unit 1 and the structure layer 21 can be used as the internal support structure of the foundation pit, so it is not necessary to arrange the internal support structure in the foundation pit 4 again, which reduces the construction and removal work of the internal support structure, and reduces the processes such as the dewatering construction, realizes the combination of the permanent structure and the temporary structure, shortens the construction period, and improves the work efficiency. In addition, the foundation unit 1 and the structure layer 21 are constructed by using the method of excavating and assembling simultaneously, and the assembling operation is performed on the ground, so the operation space is large, the interference of the support structure on the assembling operation of the subway station can be avoided, and the construction is facilitated.

[0086] Exemplarily, the tunneling equipment 6 includes a foundation pit 4 excavator.

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

[0088] Optionally, as shown in Figure 7 The structure 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 along the vertical direction. The first column 211, the support beam 212, the floor plate 213, and the pipe wall ring 214 are preformed in the factory in advance, and are assembled to form the structure layer 21 of the subway station by using the assembly construction method, which can reduce the on-site construction time, shorten the construction period, and improve the work efficiency.

[0089] Step S4 specifically includes the following steps:

[0090] S41, refer to Figure 2 and Figure 7As shown in the figure, the pipe wall ring 214 is assembled on the foundation 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 slab 213;

[0091] S42, refer to Figure 2 and Figure 7 As shown in the figure, the first column 211 is arranged inside the pipe wall ring 214, and the support beam 212 is arranged on 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 the support frame is formed by surrounding the support beam 212, the support frame includes a first frame body and a second frame body;

[0092] S43, refer to Figure 2 and Figure 7 As shown in the figure, the floor slab 213 is arranged on the first frame body, and the second frame body is used to communicate the inner cavity of the structure layer 21 with the outside.

[0093] The preset height of the floor slab 213 is the height of the structure layer 21 of the subway station. By controlling the height of the upper end of the pipe wall ring 214 to be greater than or equal to the preset height of the floor slab 213, it can be ensured that when the foundation unit 1 and the structure layer 21 move downward, the pipe wall ring 214 is always in abutment with 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, only the floor slab 213 is arranged on the first frame body, and the second frame body is reserved to be opened, which provides a transportation channel for the entry and exit of equipment, and facilitates the construction of the subway station.

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

[0095] Optionally, as shown in the figure, Figure 10 and Figure 11 The pipe wall ring 214 includes a plurality of pipe pieces 2141. The plurality of pipe pieces 2141 are sequentially and end-to-end assembled, and the two ends of the pipe piece 2141 are respectively provided with a connecting groove 2142 and a connecting protrusion 2143. The connecting protrusion 2143 of any pipe piece 2141 is clamped in the connecting groove 2142 of its adjacent pipe piece 2141. When assembling the pipe wall ring 214, the workers use hoisting equipment to hoist the pipe pieces 2141 one by one onto the foundation unit 1, and assemble them one by one according to the design shape of the subway station, and the connecting protrusion 2143 of the pipe piece 2141 is clamped in the connecting groove 2142 of its adjacent pipe piece 2141, and the pipe wall ring 214 is formed by surrounding the plurality of pipe pieces 2141, which has a simple structure and is easy to operate.

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

[0097] Exemplarily, the structural layer 21 comprises three pipe wall rings 214. In other embodiments, two or more than three pipe wall rings 214 can also be arranged according to actual engineering needs, which are not limited herein.

[0098] Optionally, as shown in Figure 10 and Figure 11 , the pipe wall ring 214 further comprises a plug-in piece 2144. The plug-in piece 2144 is vertically arranged in the pipe pieces 2141 of the plurality of pipe wall rings 214, and each pipe piece 2141 is provided with a plug hole. When the plurality of pipe wall rings 214 are vertically spliced, the plug holes of any two vertically adjacent pipe wall rings 214 need to be aligned, and the plug-in piece 2144 penetrates through the plurality of pipe wall rings 214 from top to bottom after the pipe wall rings 214 are spliced. By arranging the plug-in piece 2144, the connection strength between adjacent pipe wall rings 214 can be increased, and the overall rigidity and stability of the structural layer 21 can be improved.

[0099] Exemplarily, the plug-in piece 2144 comprises a bolt.

[0100] Optionally, the pipe wall ring 214 further comprises a sealing piece. The outer wall of the connecting protrusion 2143 and the inner wall of the connecting groove 2142 are both provided with a sealing piece. When the plurality of pipe pieces 2141 are spliced, the sealing piece on the connecting protrusion 2143 of any pipe piece 2141 tightly fits with the sealing piece in the connecting groove 2142 of the adjacent pipe piece 2141, so as to improve the tightness of the connection between the pipe pieces 2141, and prevent underground water from entering the inside of the pipe wall ring 214, thereby avoiding damaging the main structure of the subway station.

[0101] Exemplarily, the sealing piece comprises a water-expanding rubber strip.

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

[0103] S44, as shown in Figure 2 , Figure 8 and Figure 9 , one structural layer 21 is spliced on the foundation unit 1;

[0104] S45, the plurality of tunneling equipment 6 are controlled to excavate simultaneously, so as to move the foundation unit 1 and the structural layer 21 vertically downward until the upper end of the structural layer 21 is moved to be flush with the ground;

[0105] S46, repeating steps S44 and S45 until the plurality of structural layers 21 are assembled.

[0106] When the subway station is provided with a plurality of structural layers 21, one structural layer 21 is first assembled on the base unit 1, and then the excavation equipment 6 is controlled to excavate the foundation pit 4, so that the base unit 1 and the assembled structural layer 21 are moved downward in the vertical direction until the upper end of the structural layer 21 is lowered to the ground level, thereby enabling the assembly operation of the next structural layer 21 to be performed above the ground, which has a larger operation space and 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 structural layers 21 are assembled. The assembly of all structural layers 21 is performed above the ground, avoiding interference of existing facilities with the assembly operation and facilitating construction.

[0107] In the present embodiment, two structural layers 21 are provided. In other embodiments, one or more than two structural layers 21 can be provided according to actual needs, which is not limited herein.

[0108] Optionally, as shown in Figure 4 and Figure 7 , the base unit 1 comprises a guide 11, a base beam 12, a second column 13 and a plurality of tube wall rings 214. The plurality of tube wall rings 214 are stacked in the vertical direction, the second column 13 is arranged inside the tube wall ring 214, the base beam 12 is arranged at the upper end of the second column 13, and the guide 11 is arranged at the lower end of the lowermost tube wall ring 214. The side of the guide 11 close to the inner wall of the foundation pit 4 is provided with a guide inclined surface. The guide inclined surface extends obliquely in the direction close to the inner wall of the foundation pit 4, and is used to guide the downward movement of the tube wall ring 214. When assembling the base unit 1, the guide 11 is first arranged circumferentially along the foundation pit 4, and then the tube wall ring 214 is assembled vertically along the guide until the upper end of the tube wall ring 214 is flush with the second predetermined position of the base beam 12. Then the second column 13 is arranged inside the tube wall ring 214, and the base beam 12 is assembled at the upper end of the second column 13. The base beam 12 and the second column 13 cooperate to provide lateral support to the foundation pit 4, ensuring the stability of the foundation pit 4 and preventing the collapse of the foundation pit 4. When the excavation equipment 6 is controlled to excavate, the guide inclined surface of the guide 11 is inserted into the soil layer at the bottom of the foundation pit 4, which can reduce the sinking resistance when the base unit 1 moves downward, and can guide the downward movement of the tube wall ring 214.

[0109] Illustratively, the guide 11 comprises a steel blade angle.

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

[0111] Optionally, as shown in Figure 3As shown, the support structure 3 comprises bored piles 31 and top crown beams 32. Step S1 specifically comprises the following steps:

[0112] S11, set the contour line of the foundation pit 4 at the position to be constructed, arrange a plurality of bored piles 31 along the circumference of the foundation pit 4, the plurality of bored piles 31 are arranged at intervals along the circumference of the foundation pit 4, and the top crown beams 32 are poured at the top of the plurality of bored piles 31, the top crown beams 32 are connected with the upper ends of the plurality of bored piles 31;

[0113] S12, excavate the foundation pit 4 along the contour line of the foundation pit 4 to a predetermined depth.

[0114] By arranging a plurality of bored piles 31 along the circumference of the foundation pit 4, the load can be transmitted to the deep foundation, significantly enhancing the bearing capacity of the foundation, thereby ensuring the overall stability of the main structure of the subway station. In addition, the top crown beams 32 are poured at the top of the bored piles 31, so that the top crown beams 32 are connected with the upper ends of the bored piles 31, the top crown beams 32 are connected with the bored piles 31 to form an integrated support system, which can enhance the cooperation between the bored piles 31, improve the overall support effect, ensure the stability and safety of the support system, and the top crown beams 32 can disperse the load to prevent the deformation or subsidence of the bored pile 31.

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

[0116] S51, as shown in Figure 2 , Figure 4 and Figure 8 , control the plurality of tunneling equipment 6 to excavate simultaneously to make the foundation unit 1 and the structure layer 21 move downward along the vertical direction until the upper end of the structure layer 21 is flush with the ground;

[0117] S52, as shown in Figure 2 , Figure 4 and Figure 9 , erect the enclosing structure 8 on the structure layer 21 until the height difference between the first predetermined position of the upper end of the structure layer 21 and the ground is equal to the height of the enclosing structure 8;

[0118] S53, as shown in Figure 2 , Figure 4 and Figure 9 , control the plurality of tunneling equipment 6 to excavate simultaneously to make the foundation unit 1, the structure layer 21 and the enclosing structure 8 move downward along the vertical direction until the upper end of the enclosing structure 8 is flush with the ground, at this time, the upper end of the structure layer 21 moves to the predetermined position.

[0119] It is known that the whole subway station needs to be buried below the ground. When the structural layer 21 of the subway station is lowered to the level of the ground, the structural layer 21 needs to be further lowered so that the upper end of the structural layer 21 is located at the first preset position. By arranging the enclosing structure 8 on the structural layer 21, it can be ensured that the enclosing structure 8 abuts against the inner wall of the foundation pit 4 during the lowering of the structural layer 21, thereby providing lateral support for the foundation pit 4 and ensuring the stability of the foundation pit 4 to prevent the collapse of the foundation pit 4. In addition, the overall height of the enclosing structure 8 is set to be the height difference between the first preset position of the upper end of the structural layer 21 and the ground, so that when the upper end of the enclosing structure 8 is flush with the ground, the structural layer 21 is just lowered to the first preset position.

[0120] In the embodiment, the enclosing structure 8 includes two pipe wall rings 214. In other embodiments, the enclosing structure 8 can also be provided with one or more than two pipe wall rings 214 according to actual needs, which is not limited here.

[0121] Optionally, as shown in Figure 9 , the foundation structure 7 includes a sealing layer 71 and a foundation bottom plate 72. Step S7 specifically includes the following steps:

[0122] S71, as shown in Figure 2 and Figure 9 , the sealing layer 71 is poured 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 to extract the accumulated water inside the structural layer 21;

[0123] S72, as shown in Figure 2 and Figure 9 , the foundation bottom plate 72 is poured on the sealing layer 71, and the upper end of the foundation bottom plate 72 is flush with the upper end of the foundation unit 1;

[0124] S73, the floor plate 213 is arranged on the second frame body to close the structural layer 21;

[0125] S74, the capping structure is constructed at the upper end of the enclosing structure 8, and the capping structure is connected with the enclosing structure 8 and the supporting structure 3 integrally.

[0126] By pouring the bottom sealing layer 71, not only can the waterproof effect of the bottom of the foundation pit 4 be realized, the ground reaction force after pumping can be resisted, but also the error of earth excavation can be made up, the construction site can be leveled, the uniform stress of the foundation bottom surface can be ensured, the flat and firm construction platform for the subsequent construction of the foundation bottom plate 72 can be provided, the subsequent construction of the foundation bottom plate 72 is facilitated, the operation such as construction line laying, foundation formwork supporting and steel bar binding is facilitated, the construction efficiency is improved, and the error and rework in the construction process are reduced. The foundation bottom plate 72 is arranged on the bottom sealing layer 71, the bottom sealing layer 71 can not only prevent the erosion of underground water on the foundation bottom plate 72, effectively prevent the upward penetration of underground water, and ensure the durability of the foundation structure 7, but also can buffer the load transmitted by the structural layer 21 to the foundation unit 1, prevent the excessive deformation or damage of the foundation, and the like. In addition, the top sealing structure is connected with the enclosing structure 8 and the supporting structure 3 to form an integrated whole, the supporting effect of the supporting structure 3 on the subway station is further improved, the vertical support and anti-pulling requirements of the subway station are met, and the stability of the whole subway station is ensured.

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

[0128] S31, a lifting device is arranged along the side of the foundation pit 4, and the lifting device is located above the ground and connected with the lower end of the foundation unit 1;

[0129] S32, the multiple tunneling equipment 6 are simultaneously controlled to excavate, and the lifting device is simultaneously controlled to lower the foundation unit 1, so that the foundation unit 1 is uniformly moved in the vertical direction until the upper end of the foundation unit 1 is flush with the ground.

[0130] When step S3 is performed, first, the lifting device is arranged along the side of the foundation pit 4, and the lifting device is connected with the lower end of the foundation unit 1, then the tunneling equipment 6 is controlled to excavate, and the lifting device is controlled to lower the foundation unit 1, so that the foundation unit 1 is always uniformly moved in the vertical direction, the inclination of the foundation unit 1 is prevented, the whole subway station is prevented from being inclined, and the overall stability of the main structure of the subway station is ensured.

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

[0132] It should be noted that after the whole subway station is lowered to the position, the connection between the lifting device and the foundation unit 1 is removed by the staff.

[0133] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the present application. Here, it is not necessary and impossible to exhaust all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A construction method for a subway station comprising foundation units (1) and body units (2) stacked vertically, said body units (2) comprising at least one structural layer (21), characterized in that, The construction method of the subway station comprises the following steps: S1, a support structure (3) is arranged at a position to be constructed, and a foundation pit (4) is excavated to a preset depth at the position to be constructed; S2, the foundation unit (1) and the running track (5) are assembled in the foundation pit (4), and a plurality of tunneling devices (6) are hoisted onto the running track (5), the plurality of tunneling devices (6) are arranged at intervals along the horizontal direction of the foundation pit (4), and the tunneling devices (6) are used for excavating the foundation pit (4) downward; S3, the plurality of tunneling devices (6) are controlled to excavate simultaneously, so that the foundation unit (1) moves downward along the vertical direction until the upper end of the foundation unit (1) is flush with the ground; S4, the structure layer (21) is assembled on the foundation unit (1); S5, the plurality of tunneling devices (6) are controlled to excavate simultaneously, so that the foundation unit (1) and the structure layer (21) move downward along the vertical direction until the upper end of the structure layer (21) moves to the first preset position; S6, the plurality of tunneling devices (6) are hoisted out of the foundation pit (4); S7, a foundation structure (7) is constructed at the junction of the foundation unit (1) and the structure layer (21), the upper end of the foundation structure (7) is flush with the upper end of the foundation unit (1), a capping structure is constructed above the structure layer (21), and the capping structure is connected with the support structure (3) integrally; S8, it is judged whether the strength grade of each node of the subway station is greater than or equal to the design strength, if not, S9 is executed, and if yes, S10 is executed; S9, the subway station is reinforced, and then S8 is executed again; S10, the ground is backfilled and leveled.

2. The construction method of a subway station according to claim 1, characterized in that, The structure layer (21) comprises a first column (211), a support beam (212), a floor plate (213) and a plurality of pipe wall rings (214), the plurality of pipe wall rings (214) are stacked vertically, and S4 specifically comprises the following steps: S41, the pipe wall ring (214) is assembled on the foundation 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); S42, the first column (211) is arranged in the pipe wall ring (214), and the support beam (212) is arranged on 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), a support frame is formed by surrounding the support beam (212), and the support frame comprises a first frame body and a second frame body; S43, the floor plate (213) is arranged on the first frame body, and the second frame body is used for connecting the inner cavity of the structure layer (21) and 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 pieces (2141), the plurality of pipe pieces (2141) are sequentially connected end to end, and the two ends of the pipe piece (2141) are respectively provided with a connecting groove (2142) and a connecting protrusion (2143), and the connecting protrusion (2143) of any pipe piece (2141) is clamped in the connecting groove (2142) of the adjacent pipe piece (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 (2144) which is vertically arranged in the pipe pieces (2141) of the plurality of pipe wall rings (214); And / or, The pipe 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 unit (2) comprises a plurality of structure layers (21), and the plurality of structure layers (21) are vertically stacked, and the step S4 specifically comprises the following steps: S44, assembling one structure layer (21) on the foundation unit (1); S45, controlling a plurality of tunneling devices (6) to excavate simultaneously, so that the foundation unit (1) and the structure layer (21) move downward along the vertical direction until the upper end of the structure layer (21) moves to the ground level; S46, repeating steps S44 and S45 until the plurality of structure layers (21) are assembled.

6. The construction method of a subway station according to any one of claims 1 to 4, characterized in that, The foundation unit (1) comprises a guide member (11), a foundation beam (12), a second vertical column (13) and a plurality of pipe wall rings (214), the plurality of pipe wall rings (214) are vertically stacked, the second vertical column (13) is arranged inside the pipe wall ring (214), the foundation beam (12) is arranged at the upper end of the second vertical column (13), and the guide member (11) is arranged at the lower end of the lowermost pipe wall ring (214), and the side of the guide member (11) close to the inner wall of the foundation pit (4) is provided with a guide inclined surface which extends obliquely in the direction close to the inner wall of the foundation pit (4) to guide the downward movement of the pipe wall ring (214).

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 piles (31) and a top beam (32), and the step S1 specifically comprises the following steps: S11, setting the contour line of the foundation pit (4) at the to-be-constructed position, arranging a plurality of bored piles (31) along the circumference of the foundation pit (4), and arranging the plurality of bored piles (31) along the circumference of the foundation pit (4) at intervals, and pouring the top beam (32) on the top of the plurality of bored piles (31), and the top beam (32) is connected with the upper ends of the plurality of bored piles (31); S12, excavating the foundation pit (4) downward along the contour line of the foundation pit (4) to the preset depth.

8. The construction method of 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 a plurality of tunneling devices (6) to excavate simultaneously, so that the foundation unit (1) and the structure layer (21) move downward along the vertical direction until the upper end of the structure layer (21) is flush with the ground; S51, controlling a plurality of tunneling devices (6) to excavate simultaneously, so that the foundation unit (1) and the structure layer (21) move downward along the vertical direction until the upper end of the structure layer (21) is flush with the ground; S52, erect a surrounding structure (8) on the structural layer (21) until the height difference between the upper end of the surrounding structure (8) and the ground is equal to the height difference between the upper end of the structural layer (21) and the first preset position; S53, control multiple tunneling devices (6) to excavate simultaneously to make the foundation unit (1), the structural layer (21) and the surrounding structure (8) move vertically downward until the upper end of the surrounding structure (8) is flush with the ground, at which time the upper end of the structural layer (21) moves 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), a support frame is formed by surrounding the support beam (212), 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 extract the accumulated water inside the structural layer (21); S72, pouring the foundation bottom plate (72) on the sealing layer (71), the upper end of the foundation bottom plate (72) is flush with the upper end of the foundation unit (1); S73, erecting the floor plate (213) on the second frame body to close the structural layer (21); S74, constructing the sealing structure on the upper end of the surrounding structure (8), the sealing structure is connected with the surrounding structure (8) and the support structure (3) integrally.

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, arranging a lifting device along the side of the foundation pit (4), and the lifting device is located above the ground, the lifting device is connected with the lower end of the foundation unit (1); S32, controlling multiple tunneling devices (6) to excavate simultaneously, and simultaneously controlling the lifting device to lower the foundation unit (1) to make the foundation unit (1) move vertically and uniformly until the upper end of the foundation unit (1) is flush with the ground.

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