Subway station and auxiliary connecting structure and construction method

Abstract

The application discloses a subway station and subsidiary connecting structure and a construction method. The subway station and subsidiary connecting structure comprises a station main body, a main body enclosure structure, a station subsidiary, a reinforcing beam, a main body crown beam, a first support and a subsidiary enclosure structure. The main body enclosure structure is located between the station main body and the subsidiary. The station main body is provided with a main body interface beam connected with the main body enclosure structure. The lower end of the main body crown beam is connected with the upper end of the main body enclosure structure. The two ends of the first support are fixedly connected with the main body crown beam and the subsidiary enclosure structure respectively. The reinforcing beam comprises a first beam body and a second beam body which are sequentially connected in an L shape from top to bottom. The upper end of the second beam body is connected with the bottom of the main body crown beam and is flush with the upper end of the main body enclosure structure. The lower end of the second beam body is connected with the main body interface beam. One side of the second beam body is connected with the main body enclosure structure. The construction method for connecting the subway station and the subsidiary is applied to the subway station and subsidiary connecting structure. The structure is simple, convenient for construction and can remove the enclosure structure at one time.

Description

Technical Field

[0001] This invention belongs to the field of underground transportation engineering technology, specifically relating to a subway station and its ancillary connection structure and construction method. Background Technology

[0002] Currently, subway stations are mainly divided into two parts: the main station structure and the auxiliary structures. Generally, the main station structure is constructed first, followed by the auxiliary structures. During the excavation of the auxiliary foundation pit, the retaining structure of the main structure is used to provide support on the side adjacent to it. After the auxiliary structure is rebuilt, the retaining structure between the main structure and the auxiliary structure needs to be demolished when they are connected. Since the first concrete support and the capping beam of the auxiliary structure have not been removed, the retaining structure below the capping beam should not be demolished on a large scale, otherwise there is a risk of collapse due to the large span of the upper capping beam being suspended in the air. The mainstream construction method is to demolish the retaining structure vertically in two batches at intervals. After the first batch of retaining structure is demolished, the corresponding parts of the auxiliary structure are connected to the main structure by setting up post-pouring strips. After the post-pouring strips at the first connection point reach the design strength, the second batch of retaining structure is demolished, and post-pouring strips are set up at the corresponding parts for connection. Compared with large-area demolition, the risk of this construction method is controllable, but the construction process is complex, the retaining structure is demolished in two stages, and the post-pouring strips are poured in two stages, resulting in a long construction period. On the other hand, as the number of segments in the enclosure structure increases, the number of post-pouring strips also increases significantly, reducing the connection strength and waterproofing performance of the main body and auxiliary interface parts.

[0003] Therefore, a new technology is needed to address the problem of reduced connection strength and waterproofing performance between the main structure and its ancillary structures due to the numerous times the enclosure structure is demolished and the post-pouring strip is poured in existing technologies. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, this invention provides a subway station and its ancillary connection structure and construction method, which can remove the enclosure structure at the interface between the main body and the ancillary structures in one go, and the post-cast strip can be formed in one step, resulting in good strength and waterproof performance at the connection between the main body and the ancillary structures.

[0005] The present invention adopts the following technical solution: A subway station and its ancillary connection structure includes a station body, a main enclosure structure, station ancillary structures, a reinforcing beam, a main cap beam, a first support, and an ancillary enclosure structure. The main enclosure structure is located between the station body and the station ancillary structures. The station body is provided with a main interface beam that is fixedly connected to the main enclosure structure. The lower end of the main crown beam is fixedly connected to the upper end of the main enclosure structure, and the first support is horizontally arranged with its two ends fixedly connected to the main crown beam and the auxiliary enclosure structure, respectively. The reinforcing beam includes a first beam and a second beam. The first beam is located above the second beam and is fixedly connected to the second beam in an L-shape. The upper end of the second beam is fixedly connected to the bottom of the main cap beam and is flush with the upper end of the main enclosure structure. The lower end is fixedly connected to the main interface beam. The side of the second beam closest to the station is fixedly connected to the main enclosure structure.

[0006] As a further improvement to the technical solution of the present invention, it also includes an auxiliary crown beam, the lower end of which is fixedly connected to the upper end of the auxiliary enclosure structure, and the end of the first support away from the main crown beam is fixedly connected to the auxiliary crown beam.

[0007] As a further improvement to the technical solution of the present invention, the station body is provided with a top plate, and the main body interface beam is located between the top plate and the main body enclosure structure and is used to connect the top plate and the main body enclosure structure.

[0008] As a further improvement to the technical solution of the present invention, it also includes a number of spaced reinforcing ribs, each of which has a right-angled triangular cross section. The bottom of the reinforcing rib is fixedly connected to the top plate. The side of the reinforcing rib closest to the station is fixedly connected to the reinforcing beam and the main interface beam from top to bottom, while the other side is inclined and connected to the soil.

[0009] As a further improvement to the technical solution of the present invention, a second support is also included. The second support is horizontally arranged and located below the first support. The two ends of the second support are fixedly connected to the main enclosure structure and the auxiliary enclosure structure, respectively.

[0010] As a further improvement to the technical solution of the present invention, it also includes a main retaining wall, the bottom of which is fixed to the upper end of the main cap beam, and the side of the main retaining wall near the station body is connected to the soil.

[0011] As a further improvement to the technical solution of the present invention, it also includes an auxiliary retaining wall, the bottom of which is fixed to the upper end of the auxiliary cap beam.

[0012] A construction method for connecting a subway station with its ancillary structures, applied to the aforementioned connection structure, includes the following steps: S1. During the construction of the main enclosure structure of the station, a reinforcing beam steel bar connector is reserved on the side of the main cap beam and the main enclosure structure facing the main station body. During the construction of the station roof slab, a reinforcing rib wall steel bar connector is reserved above the roof slab. A reinforcing beam steel bar connector is reserved above the interface beam between the main station body and the main body. S2. After the main construction of the station is completed, the supports located above the roof slab will be removed, and the roof slab of the station will be backfilled with soil. S3. Construct the auxiliary retaining structure, auxiliary cap beam and first support, and at the same time construct the reinforcing beam above the main interface beam. The reinforcing beam is fixedly connected to the main interface beam, the main cap beam and the retained part of the main retaining structure to form an integral structure. The retained part of the main retaining structure is located between the main cap beam and the station roof slab. S4. Excavate the station's auxiliary foundation pit in layers to below the design position of the second support, and install the second support in a timely manner until the bottom of the pit is reached, and pour a concrete cushion layer at the bottom of the pit; S5. Pour the station's auxiliary base slab and part of the station's auxiliary side walls. Leave a post-pouring strip in the middle part of the station's auxiliary base slab. After the station's auxiliary base slab reaches the design strength, remove the second support. S6. Pour the station's auxiliary side walls and station's auxiliary roof slab, leaving a post-pouring strip in the middle part of the station's auxiliary roof slab; S7. After the concrete strength of the station's auxiliary structures reaches 80% of the design strength, the main retaining structure at the interface between the main station structure and the station's auxiliary structures is removed in one go, and the concrete of the post-cast strip of the station's auxiliary bottom slab and the post-cast strip of the station's auxiliary top slab is poured to connect with the main station structure. S8. Remove the first support, relocate the pipelines above the station's ancillary structures, and backfill the top slab with soil to complete the connection construction between the main station structure and the station's ancillary structures.

[0013] As a further improvement to the technical solution of the present invention, in step S3, while constructing the reinforcing beam above the main interface beam, the reinforcing ribs located above the station roof slab are also constructed.

[0014] As a further improvement to the technical solution of the present invention, in step S4, when the excavation of the station auxiliary foundation pit reaches a position 500mm below the design position of the second support, the second support is installed.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: By setting L-shaped reinforcing beams on the main body of the station, which are connected to the main cap beam and the main interface beam to form an integral structure, the reinforcing beams can provide support for the main cap beam during the construction of the connection between the main body of the station and the station ancillary structures. The main enclosure structure at the interface between the main body of the station and the station ancillary structures can be removed in one go. The post-pouring strips of the station ancillary bottom slab and the station ancillary top slab can be cast in one go, which optimizes the removal and pouring process, reduces the number of construction joints in the post-pouring strips, and thus ensures the connection strength and waterproofing effect at the post-pouring strips. After the main enclosure structure of the station is demolished, there is a large gap between the top slab of the main station and the main cap beam. The L-shaped reinforcing beam can seal the gap and has a leak-proof function. The node connection between the main body of the subway station and the auxiliary connection structure is reliable and has a strong load-bearing capacity. When the subway station and auxiliary connection structure of this scheme are used for construction, the construction method is simple and feasible, and the construction period is shortened. Attached Figure Description

[0016] The technology of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Figure 1 This is a cross-sectional view of the connection structure between the main body of the station and its ancillary structures according to the present invention; Figure 2 It is a cross-sectional view of the connection between the reinforcing beam and the main cap beam, the main interface beam, the reinforcing rib wall, and the steel reinforcement of the main enclosure structure; Figure 3 This is a schematic diagram of the connection structure between the post-cast strip of the station's auxiliary foundation slab and the main enclosure structure; Figure 4 This is a plan view showing the connection between the main station building and its ancillary facilities.

[0017] Figure label: 1-Station main body; 101-Main body roof slab; 102-Main body interface beam; 2-Main enclosure structure; 3-Station annex; 4- Ancillary enclosure structure; 5-Strengthening beam; 51-First beam; 52-Second beam; 6-Main cap beam; 7-First support; 8-Attached crown beam; 9-Reinforced ribs; 10 - Second support; 11-Main retaining wall; 12-Attached retaining wall; 13-Post-cast strip in the top slab; 14-Post-cast strip of base plate; 15-Soil. Detailed Implementation

[0018] The following will provide a clear and complete description of the concept, specific structure, and technical effects of the present invention in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, solution, and effects of the present invention. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The same reference numerals used throughout the accompanying drawings indicate the same or similar parts.

[0019] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature. Furthermore, the descriptions of "up," "down," "left," and "right" used in this invention are only relative to the relative positional relationships of the various components of the invention in the accompanying drawings.

[0020] Reference Figures 1 to 4 A subway station and its ancillary connection structure includes a station main body 1, a main retaining structure 2, station ancillary structures 3, a reinforcing beam 5, a main cap beam 6, a first support 7, and an ancillary retaining structure 4. The main retaining structure 2 is located between the station main body 1 and the station ancillary structures 3. The station main body 1 is provided with a main interface beam 102 that is fixedly connected to the main retaining structure 2. The main retaining structure 2 is a retaining structure set up to protect the excavation of the foundation pit of the station main body 1, and can preferably be a retaining pile or a diaphragm wall. The diameter of the retaining pile or the thickness of the diaphragm wall is preferably 800mm, 1000mm, or 1200mm.

[0021] The lower end of the main crown beam 6 is fixedly connected to the upper end of the main enclosure structure 2. The first support 7 is horizontally arranged and its two ends are fixedly connected to the main crown beam 6 and the auxiliary enclosure structure 4, respectively. (Refer to...) Figure 1 The first support 7 is the first concrete support for the station auxiliary 3, and C35 concrete is preferred. The cross-sectional dimensions of the first support 7 can be determined based on stress calculations. The top of the first support 7 is aligned with the top of the capping beam, and the structural steel bars at both ends of the first support 7 are anchored into the main capping beam 6 and the auxiliary capping beam 8, respectively. The auxiliary retaining structure 4 is a retaining structure set up to protect the excavation of the foundation pit of the station auxiliary 3. It can be preferably a retaining pile or a diaphragm wall. The diameter or thickness of the auxiliary retaining structure 4 is determined based on stress calculations.

[0022] The reinforcing beam 5 includes a first beam 51 and a second beam 52. The first beam 51 is located above the second beam 52 and is fixedly connected to the second beam 52 in an L-shape. The upper end of the second beam 52 is fixedly connected to the bottom of the main cap beam 6 and is flush with the upper end of the main enclosure structure 2. The lower end is fixedly connected to the main interface beam 102. The side of the second beam 52 closest to the station auxiliary 3 is fixedly connected to the main enclosure structure 2. The station auxiliary 3 is a reinforced concrete frame structure. After the station main body 1 is completed, the main enclosure structure 2 is removed and connected to the pre-reserved connectors on the top and middle slabs of the station main body 1. The station main body 1 is a reinforced concrete frame structure. The top and middle slabs of the station main body 1 are connected to the top and bottom slabs of the station auxiliary 3 through pre-reserved steel connectors, and beam-column structures are reserved at the interface. The top slab of the station main body 1 corresponds to the top slab of the station auxiliary 3, and the middle slab of the station main body 1 corresponds to the bottom slab of the station auxiliary 3.

[0023] The subway station and its ancillary connection structure in this scheme is formed by setting an L-shaped reinforcing beam 5 on the main station 1, which is connected to the main cap beam 6 and the main interface beam 102 to form an integral structure. When the main station 1 and the station ancillary 3 are connected during construction, the reinforcing beam 5 can provide support for the main cap beam 6. The main enclosure structure 2 at the interface between the main station 1 and the station ancillary 3 can be removed in one go. The post-pouring strip 14 of the station ancillary bottom slab and the post-pouring strip 13 of the station ancillary top slab can be cast in one go. This optimizes the removal and pouring process, reduces the number of construction joints in the post-pouring strip, and thus ensures the connection strength and waterproofing effect at the post-pouring strip.

[0024] The reinforcing beam 5 can be cast using C35 concrete. The width of the second beam 52 is the same as the width of the main interface beam 102 in the horizontal direction. The width of the first beam 51 in the horizontal direction is 300mm less than the width of the second beam 52. The width of the portion of the main cap beam 6 located directly above the second beam 52 is preferably 300mm. (Refer to...) Figure 1 , Figure 2 As shown, the vertical height of the reinforcing beam 5 is the distance between the top of the main cap beam 6 and the top of the main interface beam 102. The top of the first beam 51 is flush with the top of the main cap beam 6. Two rows of steel rebar connectors are reserved on the upper part of the main interface beam 102 for connection with the reinforcing beam 5. Two rows of steel rebar connectors are reserved on the inner side of the main cap beam 6 for connection with the reinforcing beam 5. Two rows of steel rebar connectors are reserved on the side of the main enclosure structure 2 facing the station main body 1 for connection with the reinforcing beam 5. During later construction, steel rebars can be anchored into the reinforcing beam 5 through splicing to form an integral structure with the reinforcing beam 5.

[0025] The main enclosure structure 2 at the interface between the station main body 1 and the station auxiliary structure 3 will need to be partially demolished later. The sections connecting the main enclosure structure 2 to the main cap beam 6 and the reinforcing beam 5 will be retained, with the height of the retained sections flush with the lower end of the reinforcing beam 5. The main cap beam 6 is cast with C35 concrete. The width of the main cap beam 6 extends 300mm beyond the edge of the main enclosure structure 2 towards the station main body 1, and the height of the main cap beam 6 is preferably 800mm to 1000mm. The main cap beam 6 is located at the top of the main enclosure structure 2. The main reinforcement bars of the main enclosure structure 2 can preferably penetrate 100mm into the main cap beam 6, anchoring them within the main cap beam 6. The main enclosure structure 2 and the main cap beam 6 are fixedly connected to strengthen the constraint at the top of the main enclosure structure 2.

[0026] After the main enclosure structure 2 of the station is demolished, there is a large gap between the top slab of the main body 1 and the main cap beam 6. The L-shaped reinforcing beam 5 can seal the gap and has a leak-proof function. The node connection between the main body 1 of the subway station and the auxiliary connection structure is reliable and has a strong load-bearing capacity. When the subway station and auxiliary connection structure of this scheme are used for construction, the construction method is simple and feasible, and the construction period is shortened.

[0027] Specifically, the subway station and its ancillary connection structure in this scheme also include an ancillary cap beam 8, the lower end of which is fixedly connected to the upper end of the ancillary enclosure structure 4, and the end of the first support 7 away from the main cap beam 6 is fixedly connected to the ancillary cap beam 8.

[0028] Specifically, the station main body 1 is provided with a top plate, and the main interface beam 102 is located between the top plate and the main enclosure structure 2 and is used to connect the top plate and the main enclosure structure 2. The main interface beam 102 can be cast with C35 concrete, and its width can be the same as the thickness of the station side wall. The upturned beam reserved at the interface between the station main body 1 and the station auxiliary 3 is the main interface beam 102. The top of the main interface beam 102 is reserved with a steel bar connector for connection with the reinforcing beam 5.

[0029] Specifically, refer to Figure 1 , Figure 2 As shown, the subway station and its ancillary connection structure in this scheme also includes several spaced reinforcing ribs 9. Each reinforcing rib 9 has a right-angled triangular cross-section. The bottom of each reinforcing rib 9 is fixedly connected to the top plate. On one side of the reinforcing rib 9 closest to the station ancillary 3, it is fixedly connected to the reinforcing beam 5 and the main interface beam 102 from top to bottom. The other side is inclined and connected to the main top plate 101. The reinforcing rib 9 can be cast with C35 concrete, with a preferred thickness of 400mm~500mm. Its longitudinal cross-section is an isosceles right-angled triangle, and the length of the right-angled side is the distance between the top of the reinforcing beam 5 and the top of the station top plate. The two right-angled sides are respectively connected to the reinforcing beam 5 and the station top plate by steel bars. The centerline of the reinforcing rib 9 is flush with the centerline of the first auxiliary support 7. During the excavation of the ancillary foundation pit, by setting several reinforcing ribs 9, the axial force of the first support is transmitted to the reinforcing beam 5 and the reinforcing ribs 9, which can effectively control the deformation of the foundation pit.

[0030] Specifically, the subway station and its ancillary connecting structure in this scheme also includes a second support 10. The second support 10 is horizontally positioned below the first support 7, and its two ends are fixedly connected to the main enclosure structure 2 and the ancillary enclosure structure 4, respectively. The second support 10 is the second steel support of the station's ancillary structure 3, and can preferably be made of Q235B material. The cross-sectional diameter of the second support 10 can preferably be 609mm or 800mm, and the wall thickness of the second support 10 can preferably be 16mm. The two ends of the second support 10 are connected to the main enclosure structure 2 and the ancillary enclosure structure 4, respectively, through steel walers.

[0031] Specifically, the subway station and its ancillary connecting structures in this scheme also include a main retaining wall 11. The bottom of the main retaining wall 11 is fixed to the upper end of the main cap beam 6, and the side of the main retaining wall 11 closest to the station main body 1 is connected to the soil 15. The main retaining wall 11 is made of C35 concrete, and its thickness is preferably 200mm~400mm. The main retaining wall 11 can be 500mm above the ground, and its structural steel bars are anchored downward into the main cap beam 6.

[0032] Specifically, the subway station and its ancillary connecting structure in this scheme also include an ancillary retaining wall 12, the bottom of which is fixed to the upper end of the ancillary capping beam 8. The ancillary retaining wall 12 is made of C35 concrete, and its thickness is preferably 200~400mm. It can be 500mm above the ground, and the structural steel bars of the ancillary retaining wall 12 are anchored downward into the ancillary capping beam 8.

[0033] A construction method for connecting a subway station with its ancillary structures, applied to the aforementioned connection structure, includes the following steps: S1. During the construction of the station main body 1 enclosure structure, a reinforcing beam 5 steel bar connector is reserved on the side of the main cap beam 6 and the main enclosure structure 2 facing the station main body 1. During the construction of the station roof slab, a reinforcing rib wall 9 steel bar connector is reserved above the roof slab. A reinforcing beam 5 steel bar connector is reserved above the interface beam 102 between the station main body 1 and the main body.

[0034] S2. After the main body of the station is completed, the supports above the top slab will be removed, and the top slab of the station will be backfilled with soil.

[0035] S3. Construct the auxiliary retaining structure 4, the auxiliary cap beam 8, and the first support 7, and simultaneously construct the reinforcing beam 5 above the main interface beam 102 and the reinforcing ribs 9 located above the station roof slab. The reinforcing beam 5 is fixedly connected to the main interface beam 102, the main cap beam 6, and the reserved portion of the main retaining structure 2 to form an integral structure. The reserved portion of the main retaining structure 2 is located between the main cap beam 6 and the station roof slab.

[0036] S4. Excavate the station auxiliary 3 foundation pit in layers to below the design position of the second support 10, and install the second support 10 in a timely manner until the bottom of the pit is reached. Pour a concrete cushion layer at the bottom of the pit. The second support 10 is installed when the excavation of the station auxiliary 3 foundation pit reaches 500mm below the design position of the second support 10.

[0037] S5. Pour the station's auxiliary base slab and part of the station's auxiliary side walls. Leave a pouring area for the post-pouring strip 14 in the middle part of the station's auxiliary base slab. After the station's auxiliary base slab reaches the design strength, remove the second support 10. Specifically, pour the post-pouring strip 14 of the base slab first, and then pour the post-pouring strip of the middle slab.

[0038] S6. Pour the station's auxiliary side walls and station's auxiliary roof slab, leaving a pouring area for the roof slab post-pouring strip 13 in the middle part of the station's auxiliary roof slab.

[0039] S7. After the concrete strength of the station auxiliary structure 3 reaches 80% of its design strength, the main retaining structure 2 at the interface between the station main body 1 and the station auxiliary structure 3 is demolished in one go. The concrete for the post-cast strip 14 of the station auxiliary bottom slab and the post-cast strip 13 of the station auxiliary top slab is then poured to connect with the station main body 1 structure. The positions of the post-cast strip 13 of the top slab and the post-cast strip 14 of the bottom slab can be referenced. Figure 1 As shown, the top slab post-cast strip 13 can be cast using C40 micro-expansion concrete, with a width consistent with the width of the station main body 1's retaining structure. After the main retaining structure 2 is demolished, the top slab of the station main body 1 is connected to the auxiliary top slab through the top slab post-cast strip 13. The bottom slab post-cast strip 14 can also be cast using C40 micro-expansion concrete, with a width consistent with the width of the station main body 1's retaining structure. After the main retaining structure 2 is demolished, the bottom slab of the station main body 1 is connected to the bottom slab of the station auxiliary 3 through the bottom slab post-cast strip 14. In addition, the bottom slab post-cast strip 14 can be set in the form of an inverted corbel to ensure timely closure and force transmission to the station main body 1 after the bottom slab of the station auxiliary 3 is poured.

[0040] S8. Remove the first support 7, carry out the relocation of pipelines above station auxiliary 3 and backfilling of the top slab, and the connection construction between station main body 1 and station auxiliary 3 can be completed.

[0041] Other aspects of the subway station and its ancillary connection structure and construction method described in this invention can be found in the prior art and will not be repeated here.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A subway station and its ancillary connection structure, characterized in that: The station includes a main station body, a main enclosure structure, station accessories, a reinforcing beam, a main cap beam, a first support, and an accessory enclosure structure. The main enclosure structure is located between the main station body and the station accessories. The main station body is provided with a main interface beam that is fixedly connected to the main enclosure structure. The lower end of the main crown beam is fixedly connected to the upper end of the main enclosure structure, and the first support is horizontally arranged and fixedly connected to the main crown beam; The reinforcing beam includes a first beam and a second beam. The first beam is located above the second beam and is fixedly connected to the second beam in an L-shape. The upper end of the second beam is fixedly connected to the bottom of the main crown beam and is flush with the upper end of the main enclosure structure. The lower end is fixedly connected to the main interface beam. The side of the second beam closest to the station is fixedly connected to the main enclosure structure. It also includes an auxiliary crown beam, the lower end of which is fixedly connected to the upper end of the auxiliary enclosure structure, and the end of the first support away from the main crown beam is fixedly connected to the auxiliary crown beam; The station's main body is provided with a top plate, and the main body interface beam is located between the top plate and the main body enclosure structure and is used to connect the top plate and the main body enclosure structure; It also includes several spaced reinforcing ribs, each reinforcing rib having a right-angled triangular cross-section. The bottom of the reinforcing rib is fixedly connected to the top plate. The side of the reinforcing rib closest to the station is fixedly connected to the reinforcing beam and the main interface beam from top to bottom, while the other side is inclined and connected to the soil.

2. The subway station and its ancillary connection structure according to claim 1, characterized in that: It also includes a second support, which is horizontally positioned below the first support, and its two ends are fixedly connected to the main enclosure structure and the auxiliary enclosure structure, respectively.

3. The subway station and its ancillary connection structure according to claim 1, characterized in that: It also includes a main retaining wall, the bottom of which is fixed to the upper end of the main cap beam, and the side of the main retaining wall closest to the station body is connected to the soil.

4. The subway station and its ancillary connection structure according to claim 1, characterized in that: It also includes an auxiliary retaining wall, the bottom of which is fixed to the upper end of the auxiliary cap beam.

5. A construction method for connecting a subway station with its ancillary structures, applied to the subway station and ancillary connection structure described in claim 2, characterized in that: Includes the following steps: S1. During the construction of the main enclosure structure of the station, a reinforcing beam steel bar connector is reserved on the side of the main cap beam and the main enclosure structure facing the main station body. During the construction of the station roof slab, a reinforcing rib wall steel bar connector is reserved above the roof slab. A reinforcing beam steel bar connector is reserved above the interface beam between the main station body and the main body. S2. After the main construction of the station is completed, the supports located above the roof slab will be removed, and the roof slab of the station will be backfilled with soil. S3. Construct the auxiliary retaining structure, auxiliary cap beam and first support, and at the same time construct the reinforcing beam above the main interface beam. The reinforcing beam is fixedly connected to the main interface beam, the main cap beam and the retained part of the main retaining structure to form an integral structure. The retained part of the main retaining structure is located between the main cap beam and the station roof slab. S4. Excavate the station's auxiliary foundation pit in layers to below the design position of the second support, and install the second support in a timely manner until the bottom of the pit is reached, and pour a concrete cushion layer at the bottom of the pit; S5. Pour the station's auxiliary base slab and part of the station's auxiliary side walls. Leave a post-pouring strip in the middle part of the station's auxiliary base slab. After the station's auxiliary base slab reaches the design strength, remove the second support. S6. Pour the station's auxiliary side walls and station's auxiliary roof slab, leaving a post-pouring strip in the middle part of the station's auxiliary roof slab; S7. After the concrete strength of the station's auxiliary structures reaches 80% of the design strength, the main retaining structure at the interface between the main station structure and the station's auxiliary structures is removed in one go, and the concrete of the post-cast strip of the station's auxiliary bottom slab and the post-cast strip of the station's auxiliary top slab is poured to connect with the main station structure. S8. Remove the first support, relocate the pipelines above the station's ancillary structures, and backfill the top slab with soil to complete the connection construction between the main station structure and the station's ancillary structures.

6. The construction method for connecting subway stations and ancillary facilities according to claim 5, characterized in that: In step S3, while constructing the reinforcing beam above the main interface beam, the reinforcing ribs located above the station roof slab are also constructed.

7. The construction method for connecting subway stations and ancillary facilities according to claim 5, characterized in that: In step S4, when the excavation of the station's auxiliary foundation pit reaches a position 500mm below the design location of the second support, the second support is installed.

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