Assembled subway station and construction method thereof

Abstract

An assembled subway station and a construction method thereof, which relate to the technical field of subway construction, include an annular assembly unit formed by splicing a plurality of prefabricated components end to end, the interior of the annular assembly unit is supported by a cross structure; two adjacent prefabricated components are spliced ​​by tongue and groove or mortise and tenon structures, and a waterproof sealing pad is arranged at the joint, at least two prestressed structures are tensioned at both ends of the joint to make the joint tightly closed; the prestressed structure includes a prestressed beam in a flat arc shape, and tension anchoring reserved grooves are reserved on the two adjacent prefabricated components, the tension anchoring reserved grooves are arranged at a position close to the inner side of the annular assembly unit, and the two ends of the prestressed beam are anchored in a pair of tension anchoring reserved grooves by anchor clamps. The present invention can make the joint of the assembled subway station have excellent waterproof performance, high connection strength and rigidity, inhibit the cracking of the structure in the joint range, thereby ensuring the structural safety and use function of the station and enhancing durability.

Description

Technical Field

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

[0002] Due to the general characteristics of prefabricated structures, the joints of prefabricated stations often become the weak parts of the station structure, which is mainly reflected in two aspects: first, the waterproof is weak. Under the influence of external groundwater, the joints of the main structure of the subway station located underground leak during use; second, the bearing capacity is relatively weak compared to other parts. In the past, the joints of prefabricated stations generally needed to be set at the parts with less stress on the cross section, avoiding the corners of the station with greater stress at a certain distance, which greatly reduced the feasibility of prefabricated stations. In the final analysis, it is because the general joints are also the weak parts of the station structure.

[0003] The prior art, for example, the patent application with publication number CN117144970A, discloses an assembled subway station structure and its construction method, which sets several waterproof pads in the groove to stop water; and sets steel in the joint to meet the stress of the joint section. Since the joint has no prestress, the waterproof ability and stress performance of the joint are not ideal, and the joint often becomes the weak point of the assembled station structure, and the durability cannot be effectively guaranteed, affecting the service life;

[0004] For example, the patent application with publication number CN112502186A discloses an assembled subway station structure with an integrated building space structure. Prestressing is arranged in the circumferential direction of the structure parallel to the outer surface of the prefabricated structure, and combined with tongue-and-groove or mortise-and-tenon structural joints. Compared with the present invention, the disadvantage of this method is that the prefabricated component blocks are not flexible enough and the construction is relatively inconvenient; the prestressing bundle cannot be replaced after the prestressing fails in the later stage. Summary of the invention

[0005] The object of the present invention is to provide an assembled subway station and a construction method thereof, so as to solve the problems in the prior art that the strength and rigidity of the joints of the assembled station structure are weak and the prestressed tendons at the joints fail and cannot be replaced.

[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0007] An assembled subway station comprises a circular assembly unit formed by splicing a plurality of prefabricated components end to end, wherein the interior of the circular assembly unit is supported by a cross structure;

[0008] Two adjacent prefabricated components are spliced ​​by tongue-and-groove or mortise-and-tenon structures, and a waterproof sealing pad is arranged at the joint, and at least two prestressed structures are tensioned at both ends of the joint to make the joint tightly closed;

[0009] The prestressed structure includes a prestressed beam in a flat arc shape, the arc radius of the prestressed beam is not less than 2.5h, and two adjacent prefabricated components are both provided with tension anchoring reserved grooves, the tension anchoring reserved grooves are arranged at the position of the annular assembly unit close to the inner side of the station, the two ends of the prestressed beam are anchored in a pair of tension anchoring reserved grooves by anchor clamps, and the distance between the anchor point of the prestressed beam and the cross section at the joint is not less than h;

[0010] Where h is the standard thickness of the precast component.

[0011] As a preferred solution of the present invention, the tensioning anchoring reserved groove is triangular in shape and the size of its anchoring end face is not less than 250×250 mm, the other end face of the tensioning anchoring reserved groove intersects with the anchoring end face and the included angle is not less than 90°, and the other ends of the intersecting two end faces away from their intersection point extend to the inner side edge of the prefabricated component.

[0012] As a preferred solution of the present invention, the prestressed bundle includes a corrugated pipe and a steel bundle. The corrugated pipe is provided with two sections. The two sections of the corrugated pipe are respectively embedded in two adjacent prefabricated components. The steel bundle is installed in the corrugated pipe, and the end of the steel bundle is anchored in a tensioning anchor reserved groove through an anchor clamp.

[0013] As a preferred solution of the present invention, the circumferential assembly unit includes a top plate middle prefabricated component, a top plate corner prefabricated component, a bottom plate corner prefabricated component and a bottom plate middle longitudinal beam prefabricated component;

[0014] The top plate corner prefabricated components are L-shaped and arranged at both ends of the top plate middle prefabricated components, the bottom plate corner prefabricated components are also L-shaped and arranged at both ends of the bottom plate middle longitudinal beam prefabricated components, and a side wall prefabricated component is arranged between the top plate corner prefabricated components and the bottom plate corner prefabricated components on the same side;

[0015] The top plate middle prefabricated components and the top plate corner prefabricated components, the bottom plate middle longitudinal beam prefabricated components and the bottom plate corner prefabricated components are spliced ​​by a tongue-and-groove structure, the top plate corner prefabricated components and the bottom plate corner prefabricated components and the side wall prefabricated components are spliced ​​by a mortise-and-groove structure, and the waterproof sealing pads are arranged at the joints, and the prestressed structure is arranged across both ends of the joints.

[0016] As a preferred solution of the present invention, the cross structure includes a middle plate prefabricated component, a middle longitudinal beam prefabricated component, an upper column prefabricated component, a lower column prefabricated component and a top longitudinal beam prefabricated component;

[0017] A top longitudinal beam prefabricated component is arranged in the middle position of the middle prefabricated component of the top plate, one end of the upper column prefabricated component is connected to the top longitudinal beam prefabricated component, one end of the lower column prefabricated component is connected to the upper column prefabricated component, the other end of the lower column prefabricated component is connected to the middle position of the middle longitudinal beam prefabricated component of the bottom plate, the middle longitudinal beam prefabricated component is arranged on the lower column prefabricated component, the middle plate prefabricated component is supported on the middle longitudinal beam prefabricated component, and the two ends of the middle plate prefabricated component are respectively connected to the side wall prefabricated components on both sides.

[0018] As a preferred solution of the present invention, the middle position of the side wall prefabricated component and the end of the middle plate prefabricated component are spliced, and a prestressed structure is tensioned at both ends of the splicing seam.

[0019] As a preferred solution of the present invention, a plurality of longitudinal connection reserved holes are arranged along the annular direction of the annular assembling unit, and the plurality of annular assembling units are connected in series via the longitudinal connection reserved holes.

[0020] The present invention also provides a construction method for the above-mentioned assembled subway station, comprising the following steps:

[0021] Step 1: dividing the subway station into a plurality of segmental annular assembly units along the longitudinal direction of the subway station;

[0022] Step 2, dividing the circumferential assembly unit into a plurality of prefabricated components along its circumferential direction, and prefabricating the prefabricated components;

[0023] Step 3: transport the prefabricated components to the site of the subway station, assemble the prefabricated components from bottom to top, install waterproof sealing pads at each joint, and tension and anchor at least two prestressed tendons at both ends of the joint close to the inner side of the subway station until the construction of a segment of the circumferential assembly unit is completed;

[0024] Step 4: Repeat steps 2 and 3 until all the annular assembly units are constructed, and two adjacent annular assembly units are spliced ​​in sequence along the longitudinal direction through the longitudinal connection reserved holes.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) The prestressing of the present invention greatly enhances the waterproofing effect of the joints to prevent water leakage in the station. In particular, the prestressed beams with a large radius are arranged in a flat arc shape, which has better stress-bearing performance. On the one hand, it can avoid the formation of stress concentration and damage to the node concrete. On the other hand, this flat arc design allows sufficient space to arrange at least two inner and outer steel beams under certain plate thickness conditions, thereby enhancing the stress-bearing performance of the joints and improving the strength and rigidity of the joints. There is no need to stick to setting the joints at the cross-sectional position with smaller circumferential internal force. Further, the prefabricated components of the station can be divided into blocks flexibly, and the blocks can also be miniaturized, which is convenient for assembly and construction and enhances feasibility.

[0027] (2) Since the outer sides of the roof, floor and side walls of the subway station are all covered with a waterproof layer, the present invention not only satisfies the requirement of tensioning at least two prestressed tendons, but also ensures that the prestressed tendons are tensioned with anchor ends located inside the station structure. During operation, when stress relaxation of the prestressed tendons is detected, the prestressed tendons can be replaced, thereby ensuring the structural safety and durability of the station throughout its entire service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0029] Figure 1 A schematic diagram of the structure of an assembled subway station provided by an embodiment of the present invention;

[0030] Figure 2 for Figure 1 A magnified view of middle;

[0031] Figure 3 for Figure 1 Enlarged view of middle B;

[0032] Figure 4 for Figure 2 Enlarged view of middle C;

[0033] Figure 5 for Figure 2 Enlarged view of D in the middle.

[0034] Reference numerals:

[0035] 1. Prefabricated components of the middle longitudinal beam of the bottom plate; 2. Prefabricated components of the corners of the bottom plate; 3. Prefabricated components of the side walls; 4. Prefabricated components of the corners of the top plate; 5. Prefabricated components of the middle part of the top plate; 6. Prefabricated components of the middle plate; 7. Prefabricated components of the middle longitudinal beam; 8. Prefabricated components of the upper columns; 9. Prefabricated components of the lower columns; 10. Prefabricated holes for longitudinal connections; 11. Prefabricated components of the top longitudinal beam; 12. Prefabricated grooves for tensioning and anchoring; 13. Prestressed tendons;

[0036] 41. Waterproof sealing gasket; 42. Clip; 43. Anchor plate; 44. Spiral steel bar; 45. Steel bundle; 46. Corrugated pipe; 47. Anchor plate. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The following first describes the concepts involved in the present application in conjunction with the accompanying drawings. It should be noted that the following description of each concept is only to make the content of the present application easier to understand, and does not limit the scope of protection of the present application; at the same time, the embodiments and features in the embodiments of the present application can be combined with each other in the absence of conflict. The present application will be described in detail with reference to the accompanying drawings and in conjunction with the embodiments.

[0039] Based on the common characteristics of prefabricated structures in the prior art, the joints of prefabricated stations often become the weak parts of the station structure. The present invention provides a prefabricated subway station joint that has both excellent waterproof properties and high strength, thereby improving the usability of the subway station and enhancing its durability.

[0040] like Figure 1 As shown, an assembled subway station includes an annular assembly unit formed by splicing a plurality of prefabricated components end to end, wherein the interior of the annular assembly unit is supported by a cross structure; a plurality of longitudinal connection reserved holes 10 are arranged along the annular direction of the annular assembly unit, and the plurality of annular assembly units are connected in series via the longitudinal connection reserved holes 10.

[0041] like Figure 2 , Figure 3 and Figure 5 As shown, two adjacent prefabricated components are spliced ​​by tongue-and-groove or mortise-and-tenon structures for easy assembly, and a waterproof sealing pad 41 is provided at the joint, and at least two prestressed structures are tensioned at both ends of the joint to make the joint tightly closed.

[0042] In combination with the existing structure of the above-mentioned prefabricated subway station, the feature of the present invention is that at least two prestressed structures are tensioned at both ends of the joint. Compared with the prior art in which only one prestressed structure is arranged, the prestress greatly enhances the waterproof effect of the joint to prevent water leakage in the station; and enhances the force-bearing performance of the joint, improves the strength and rigidity of the joint, eliminates the weak links of the joints of the prefabricated station, and greatly enhances the overall stability of the prefabricated station.

[0043] Furthermore, the prestressed structure in the prior art is usually arranged along a full length parallel to the length direction of the prefabricated component, which can also achieve the effect of pre-applying pressure, but this method is combined with the tongue and groove or mortise and tenon structural joints, and the anchor point of the prestressed bundle 13 can only be arranged on the cross-section of the interface, which is quite limited when dividing the prefabricated components into blocks, and it is impossible to flexibly adjust and replace them.

[0044] Based on the above, if Figure 2 As shown, the present invention adjusts the traditional linear prestressed bundle into a flat arc shape, and does not need to be laid out through the length, thereby saving the prestressed bundle 13. That is, the prestressed structure includes a prestressed bundle 13 in a flat arc shape, and the curvature of the flat arc is further restricted. The arc radius of the prestressed bundle 13 is not less than 2.5h, where h is the standard thickness of the prefabricated component. The upper limit of the arc radius of the prestressed bundle 13 can generally be adjusted automatically on the basis of reaching the lower limit, so that the force on the node can be reasonable, and at the same time, the layout space of the two prestressed bundles 13 can be ensured.

[0045] This arrangement of a flat arc (circular arc with a larger radius) has a better stress-bearing performance and can avoid stress concentration and damage to the concrete at the node. On the other hand, the thickness of the prefabricated component is limited. If a circular arc with a smaller radius is used, when two or more prestressed tendons 13 are applied, there is no sufficient space for arrangement.

[0046] In addition, the present invention has also made targeted modifications to the anchoring sites of the prestressed bundle 13. Different from the prior art in which the anchoring points at both ends of the prestressed bundle 13 are usually arranged near the middle position, the present invention has reserved tension anchoring reserved grooves 12 on two adjacent prefabricated components. The tension anchoring reserved grooves 12 are arranged at a position of the annular assembly unit close to the inner side of the station, and the two ends of the prestressed bundle 13 are anchored in a pair of the tension anchoring reserved grooves 12 by anchor clamps.

[0047] Here, it is necessary to briefly explain that the bottom of the subway station floor component is a waterproof board, and the foundation is below it; the outside of the side wall is also covered with waterproof boards, and the outside of the waterproof boards is generally the station enclosure structure piles or continuous walls. The top plate component is generally waterproof coating above it (outside), and soil is covered on it. The present invention takes into account that the prestressed steel bundle 45 may relax during operation, so the splicing construction at the joints is arranged in the internal space of the station, that is, the prestressed tension anchor end tension anchor reserved groove 12 is arranged on one side of the inner side of the station, which is also convenient for replacing failed prestressed steel bundles 45 during operation.

[0048] The present invention also sets the distance between the anchor point and the cross section at the joint to be no less than h, where h is the standard thickness of the prefabricated component. Similarly, the upper limit of the distance between the anchor point and the cross section at the joint can also be flexibly adjusted to ensure that the node is subjected to reasonable force and has sufficient space for arranging the prestressed tendons.

[0049] In order to meet the tensioning operation space of the tensioning jack and the space requirements for anchoring of the anchor clamp, and to minimize the damaged area of ​​the prefabricated component, the tensioning anchor reserved groove 12 is triangular in shape and the size of its anchoring end face is not less than 250×250mm, and the other end face of the tensioning anchor reserved groove 12 intersects with the anchoring end face with an angle of not less than 90°, and the other ends of the intersecting two end faces away from their intersection point extend to the inner side edge of the prefabricated component.

[0050] The size and angle of the anchoring end surface of the tension anchoring reserved groove 12 are as small as possible, provided that the above parameters are met, and can be adjusted according to the actual arrangement data of the prestressed tendon 13 .

[0051] The prestressed bundle 13 includes a bellows 46 and a steel bundle 45. The bellows 46 is provided with two sections. The two sections of the bellows 46 are respectively embedded in two adjacent prefabricated components. The steel bundle 45 is installed in the bellows 46, and the end of the steel bundle 45 is anchored in the tensioning anchor reserved groove 12 through an anchor clamp.

[0052] As for the specific division of the annular assembly unit, it can be flexibly adjusted because of the improvement of the prestressed structure, and the present invention does not impose any restrictions. In a specific embodiment, the annular assembly unit includes a top plate middle prefabricated component 5, a top plate corner prefabricated component 4, a bottom plate corner prefabricated component 2 and a bottom plate middle longitudinal beam prefabricated component 1;

[0053] The top plate corner prefabricated component 4 is L-shaped and is arranged at both ends of the top plate middle prefabricated component 5, the bottom plate corner prefabricated component 2 is also L-shaped and is arranged at both ends of the bottom plate middle longitudinal beam prefabricated component 1, and a side wall prefabricated component 3 is arranged between the top plate corner prefabricated component 4 and the bottom plate corner prefabricated component 2 on the same side;

[0054] The top plate middle prefabricated component 5 and the top plate corner prefabricated component 4, the bottom plate middle longitudinal beam prefabricated component 1 and the bottom plate corner prefabricated component 2 are spliced ​​by a tongue-and-groove structure, while the top plate corner prefabricated component 4 and the bottom plate corner prefabricated component 2 and the side wall prefabricated component 3 are spliced ​​by a mortise and tenon structure, and the waterproof sealing pad 41 is arranged at the joint, and the prestressed structure is arranged across both ends of the joint.

[0055] The cross structure supports include a middle plate prefabricated component 6, a middle longitudinal beam prefabricated component 7, an upper column prefabricated component 8, a lower column prefabricated component 9 and a top longitudinal beam prefabricated component 11;

[0056] A top longitudinal beam prefabricated component 11 is arranged in the middle position of the top plate middle prefabricated component 5, one end of the upper column prefabricated component 8 is connected to the top longitudinal beam prefabricated component 11, one end of the lower column prefabricated component 9 is connected to the upper column prefabricated component 8, and the other end of the lower column prefabricated component 9 is connected to the middle position of the bottom plate middle longitudinal beam prefabricated component 1, the middle longitudinal beam prefabricated component 7 is arranged on the lower column prefabricated component 9, the middle plate prefabricated component 6 is supported on the middle longitudinal beam prefabricated component 7, and the two ends of the middle plate prefabricated component 6 are respectively connected to the side wall prefabricated components 3 on both sides.

[0057] The middle position of the side wall prefabricated component 3 is spliced ​​with the end of the middle plate prefabricated component 6. Considering that the force requirement there is not high, a prestressed structure is tensioned at both ends of the splicing seam.

[0058] The present invention also provides a construction method for the above-mentioned assembled subway station, comprising the following steps:

[0059] Step 1: dividing the subway station into a plurality of segmental annular assembly units along the longitudinal direction of the subway station;

[0060] Step 2, dividing the circumferential assembly unit into a plurality of prefabricated components along its circumferential direction, and prefabricating the prefabricated components;

[0061] Step 3: transport the prefabricated components to the site of the subway station, assemble the prefabricated components from bottom to top, install a waterproof sealing pad 41 at each joint, and tension and anchor at least two prestressed beams 13 at both ends of the joint close to the inner side of the subway station until the construction of a segment of the annular assembly unit is completed;

[0062] Step 4, repeating steps 2 and 3 until the construction of all the annular assembly units is completed, and two adjacent annular assembly units are sequentially spliced ​​longitudinally through the longitudinal connection reserved holes 10.

[0063] In a specific embodiment, the station structure can be divided into the following parts in the annular direction: Figure 1The various prefabricated components shown are transported to the station site after prefabrication, and then installed from bottom to top, namely:

[0064] (1) First install the prefabricated components 2 at the corners of the bottom plate on both sides of the station, and then install the prefabricated components 1 of the longitudinal beams in the bottom plate;

[0065] (2) Install the prefabricated side wall components 3 and the lower column prefabricated components 9 on both sides;

[0066] (3) Install the middle longitudinal beam prefabricated component 7 and the middle plate prefabricated component 6 in sequence;

[0067] (4) Install the upper column prefabricated component 8 (upper middle column) and the top longitudinal beam prefabricated component 11 in sequence;

[0068] (5) Install the prefabricated components 4 at the corners of the top plates on both sides;

[0069] (6) Finally, the middle prefabricated component 5 of the middle top plate is installed to complete the circumferential assembly construction of one segment.

[0070] For each assembly joint, first install and fix the waterproof sealing pad 41 at the joint, and then align the prefabricated components on both sides (or above and below) of the joint in place; install high-strength steel bundles 45 and anchor clamps in the prestressed embedded pipes, and tension and anchor the steel bundles 45 in batches.

[0071] The anchor is an anchoring structure composed of a clip 42, an anchor plate 43, a spiral steel bar 44, and an anchor pad 47 in the prior art. Figure 4 As shown, a jack is used to tension the steel strand 45 in the tensioning and anchoring reserved groove 12 to apply prestress and anchor it.

[0072] The embodiments and / or implementation methods described above are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any form. Any technical personnel in this field may make slight changes or modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but they should still be regarded as technologies or embodiments that are essentially the same as the present invention.

[0073] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the invention to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. An assembled subway station, characterized in that: It comprises a ring-shaped assembly unit formed by splicing a plurality of prefabricated components end to end, wherein the interior of the ring-shaped assembly unit is supported by a cross structure; Two adjacent prefabricated components are spliced ​​together by means of a tongue-and-groove structure or a mortise-and-tenon structure, and a waterproof sealing pad (41) is provided at the joint, and at least two prestressed structures are tensioned at both ends of the joint to make the joint tightly closed; The prestressed structure comprises a prestressed bundle (13) in the shape of a flat arc, the arc radius of the prestressed bundle (13) is not less than 2.5h, two adjacent prefabricated components are both provided with a tension anchoring reserved groove (12), the tension anchoring reserved groove (12) is arranged at a position of the annular assembly unit close to the inner side of the station, the two ends of the prestressed bundle (13) are anchored in a pair of the tension anchoring reserved grooves (12) by anchor clamps, and the distance between the anchor point of the prestressed bundle (13) and the cross section at the joint is not less than h; Wherein, h is the standard thickness of the prefabricated component; The prestressed bundle (13) comprises a corrugated pipe (46) and a steel bundle (45), the corrugated pipe (46) being provided with two sections, the two sections of the corrugated pipe (46) being respectively pre-buried in two adjacent prefabricated components, the steel bundle (45) being installed in the corrugated pipe (46), and the end of the steel bundle (45) being anchored in a tension anchoring reserved groove (12) by an anchor clamp; The tension anchoring reserved groove (12) is triangular in shape and the size of its anchoring end face is not less than 250×250 mm, the other end face of the tension anchoring reserved groove (12) intersects with the anchoring end face and the included angle is not less than 90°, and the other ends of the intersecting two end faces away from their intersection point both extend to the inner side edge of the prefabricated component.

2. The assembled subway station according to claim 1, characterized in that: The annular assembly unit comprises a top plate middle prefabricated component (5), a top plate corner prefabricated component (4), a bottom plate corner prefabricated component (2) and a bottom plate middle longitudinal beam prefabricated component (1); The top plate corner prefabricated component (4) is L-shaped and is arranged at both ends of the top plate middle prefabricated component (5); the bottom plate corner prefabricated component (2) is also L-shaped and is arranged at both ends of the bottom plate middle longitudinal beam prefabricated component (1); and a side wall prefabricated component (3) is arranged between the top plate corner prefabricated component (4) and the bottom plate corner prefabricated component (2) on the same side; The top plate middle prefabricated component (5) and the top plate corner prefabricated component (4), and the bottom plate middle longitudinal beam prefabricated component (1) and the bottom plate corner prefabricated component (2) are spliced ​​via a tongue-and-groove structure, and the top plate corner prefabricated component (4) and the bottom plate corner prefabricated component (2) and the side wall prefabricated component (3) are spliced ​​via a tongue-and-groove structure, and the waterproof sealing pad (41) is arranged at the joint, and the prestressed structure is arranged across both ends of the joint.

3. The assembled subway station according to claim 2, characterized in that: The cross structure comprises a middle plate prefabricated component (6), a middle longitudinal beam prefabricated component (7), an upper column prefabricated component (8), a lower column prefabricated component (9) and a top longitudinal beam prefabricated component (11); A top longitudinal beam prefabricated component (11) is arranged in the middle position of the top plate middle prefabricated component (5); one end of the upper column prefabricated component (8) is connected to the top longitudinal beam prefabricated component (11); one end of the lower column prefabricated component (9) is connected to the upper column prefabricated component (8); the other end of the lower column prefabricated component (9) is connected to the middle position of the bottom plate middle longitudinal beam prefabricated component (1); the middle longitudinal beam prefabricated component (7) is arranged on the lower column prefabricated component (9); the middle plate prefabricated component (6) is supported on the middle longitudinal beam prefabricated component (7); and both ends of the middle plate prefabricated component (6) are respectively connected to the side wall prefabricated components (3) on both sides.

4. The assembled subway station according to claim 3, characterized in that: The middle position of the side wall prefabricated component (3) and the end of the middle plate prefabricated component (6) are spliced, and a prestressed structure is tensioned at both ends of the splicing seam.

5. The assembled subway station according to claim 1, characterized in that: A plurality of longitudinal connection reserved holes (10) are arranged along the annular direction of the annular assembly unit, and the plurality of annular assembly units are connected in series via the longitudinal connection reserved holes (10).

6. A construction method for an assembled subway station according to any one of claims 1 to 5, characterized in that: The steps include: Step 1: dividing the subway station into a plurality of segmental annular assembly units along the longitudinal direction of the subway station; Step 2, dividing the circumferential assembly unit into a plurality of prefabricated components along its circumferential direction, and prefabricating the prefabricated components; Step 3, transporting the prefabricated components to the site of the subway station, assembling the prefabricated components from bottom to top, installing waterproof sealing pads (41) at each joint, tensioning and anchoring at least two prestressed tendons (13) at both ends of the joint close to the inner side of the subway station, until the construction of a segment of the annular assembly unit is completed; Step 4, repeating steps 2 and 3 until the construction of all the annular assembly units is completed, and two adjacent annular assembly units are sequentially spliced ​​longitudinally through the longitudinal connection reserved holes (10).

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