Underground station structure under existing viaduct and construction method thereof
By building underground stations under existing viaducts and using concrete cylinder walls to wrap overpass bridge piles, the problem of difficult synchronization between viaducts and underground stations is solved, and the relative independence between structures and construction savings are achieved.
Patent Information
- Application Number
- CN202411621988.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-14
- Publication Date
- 2025-02-28
AI Technical Summary
In the core area of the city, the construction of existing viaducts and underground stations is difficult to synchronize, resulting in damage to the viaduct structure and the structural independence of underground stations.
An underground station structure under an existing viaduct and its construction method are adopted. By setting up station ground connection walls, column piles, roof plates, middle plates, upper side walls, bottom plates and lower side walls under the viaduct, and wrapping the viaduct bridge piles in it with a concrete cylinder wall, the stress state of horizontal constraints and vertical separation is achieved.
The relatively independent design and construction of the viaduct and the underground station has been realized, the number of temporary structures has been reduced, the construction period and resources have been saved, and the operation safety of the viaduct and the structural durability of the underground station have been ensured.
Smart Images
Figure CN119531408A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of underground engineering, and in particular to an underground station structure under an existing viaduct and a construction method thereof. Background Art
[0002] With the gradual development of urban transportation systems, line planning has become increasingly complex, and the vertical space construction in urban core areas has gradually become more refined. Since urban rail transit and urban viaducts are often laid along urban main roads, there are more and more cases where there are existing viaducts above new underground stations. On the one hand, the viaduct piles in the road fall within the excavation range of the underground station foundation pit. As the foundation pit is excavated and exposed, the calculated length of the bridge piles increases, and its horizontal stiffness is weakened. During construction, the viaduct traffic may be interrupted, affecting the travel of surrounding citizens; on the other hand, the intrusion of the bridge piles into the underground station space affects the structural independence of the underground station. The force characteristics of these two different structural types are very different, and mutual interference is not conducive to the structural safety and durability of both.
[0003] The depth and location of underground stations are controlled by multiple factors such as the longitudinal curve of the line and site conditions. At the same time, the entrances and exits need to consider the connection with the surrounding environment. Therefore, the plane layout of underground stations often needs to be further deepened in the construction drawing stage. Its plane layout plan is difficult to advance and the construction period is long. In contrast, the planning, design and construction period of urban elevated overpasses are often earlier than those of underground stations. Therefore, it is difficult to implement the elevated overpass and the underground station below at the same time in actual projects. Summary of the invention
[0004] In order to solve the above problems, the present invention provides an underground station structure under an existing viaduct and a construction method thereof, which solves the difficult problem that the viaduct and the underground station below (especially the underground subway station) need to be implemented and designed in stages, and ensures the relative independence between the structures under the premise of relative spatial overlap and difficulty in separation.
[0005] The technical solution adopted by the present invention is: an underground station structure under an existing viaduct, characterized in that: it is located under the existing viaduct, and includes a station ground connection wall, a station stand column pile, a station top plate, a station middle plate, a station upper side wall, a station bottom plate, a station lower side wall and a concrete cylinder wall, wherein the station ground connection wall and the station stand column pile are vertically arranged on the ground below the viaduct deck, and the station stand column pile is arranged between the station ground connection walls on both sides; between the station ground connection walls on both sides, there are arranged horizontally arranged on the station top plate, the station stand column pile, and the station stand column pile in sequence from top to bottom. The station upper side wall connected to the station middle plate is arranged between the station top plate and the station ground connection wall, and the station lower side wall connected to the station bottom plate is arranged between the station middle plate and the station ground connection wall; the viaduct piles of the viaduct pass through the station top plate, the station middle plate and the station bottom plate in sequence from top to bottom, and a vertically arranged concrete cylinder wall is arranged between the viaduct piles and the underground station; the viaduct piles are surrounded by the concrete cylinder wall, vertically pass through the underground station, and are in a stress state of horizontal constraint and vertical separation with the underground station.
[0006] Preferably, the concrete cylinder wall comprises a lower cylinder wall and an upper cylinder wall, the lower cylinder wall is arranged between the station middle plate and the station bottom plate, and the upper cylinder wall is arranged between the station top plate and the station middle plate.
[0007] Preferably, a plurality of concrete support blocks are arranged at the floor plate elevation positions of the station top plate, the station middle plate and the station bottom plate to form horizontal constraints on the viaduct piles; the concrete support blocks are arranged between the concrete cylinder wall and the viaduct piles.
[0008] Preferably, the concrete support block comprises U-shaped bars anchored into the concrete cylinder wall.
[0009] Preferably, the gap between the concrete cylinder wall and the viaduct piles is filled with foam concrete, and the foam concrete also serves as an inner formwork for the construction of the concrete cylinder wall.
[0010] Preferably, the concrete support block is fixed between the concrete cylinder wall and the viaduct piles by using filled and cured foam concrete.
[0011] Preferably, a station outer waterproof layer is laid on the surface of the foam concrete.
[0012] As a preferred option, the main structure of the underground station is mainly made of C35 concrete, and the station ground-connected walls, station column piles and concrete cylinder walls are made of C50 concrete; the concrete cylinder wall is a 500mm thick exterior wall with a P8 waterproof grade.
[0013] A construction method for an underground station structure under an existing viaduct comprises the following steps:
[0014] S1. Build the station ground-connected wall and station column piles below the viaduct deck, and then carry out the reverse excavation of the foundation pit; first, excavate and cover the soil to the bottom of the station roof, and build the station roof. After the station roof has formed strength, backfill the soil and restore the ground traffic;
[0015] S2. Dig down to the bottom of the station middle plate, construct the station middle plate, and after the station middle plate has formed strength, construct the station upper side wall to form the station upper structure;
[0016] S3. Continue to dig down to the bottom of the foundation pit and construct the station floor. After the station floor has formed strength, construct the lower side wall of the station to complete the bottom cover of the underground station;
[0017] S4. After the bottom of the underground station is completed, the concrete cylinder wall is constructed from bottom to top. The filled foam concrete is used as the inner formwork of the concrete cylinder wall, and the lower cylinder wall and the upper cylinder wall are constructed from bottom to top.
[0018] Preferably, during the foundation pit excavation process, the viaduct piles are exposed as the foundation pit is excavated to supplement the horizontal support constraints, while the horizontal supports do not generate vertical forces with the viaduct piles.
[0019] The beneficial effects achieved by the present invention are as follows: the underground station structure of the present invention is located under the existing viaduct and is implemented by the cover-excavation reverse method. The floor plates of the underground station provide horizontal support for the foundation pit together with the enclosure structure during construction, reducing the number of temporary structures, reducing waste, saving energy and protecting the environment, and saving construction time; the present invention uses the floor plates of the underground station to set concrete support blocks to provide top-down horizontal constraints for the existing viaduct piles, ensuring the safety of the viaduct structure and ensuring that the viaduct operation is not interrupted during construction; the concrete support blocks only provide horizontal forces between the station structure and the pile structure, and at the same time treat the surface of the pile to ensure that the pile surface is smooth and does not generate vertical interaction forces with the station; the present invention has the following advantages:
[0020] 1. During the construction of the viaduct, the present invention only needs to consider the influence of the subsequent underground station excavation conditions on the design pile length of the bridge piles, and end-bearing piles are preferably used in combination with geological conditions; the present invention can achieve phased design of the viaduct and the underground station, which are relatively independent, and the mutual influence between the bridge pile arrangement and the subsequent underground station layout is small, which is convenient for different professional units to provide information to each other and coordinate construction;
[0021] 2. The underground station is constructed by the cover-excavation reverse method. When the underground station foundation pit is excavated, the bridge piles are exposed. The station slab is constructed from top to bottom and concrete support blocks are set to supplement the horizontal constraints of the bridge piles in time. Therefore, during the excavation of the underground station foundation pit, the force system of the elevated bridge is guaranteed and the elevated traffic operation is not affected.
[0022] 3. Implement an underground station structure under an already operational viaduct, and build a cylindrical wall structure at the same time, wrap the bridge piles inside the cylindrical wall (i.e., outside the station), and let the bridge piles pass through the stratum from outside the station space to ensure that the forces of the bridge structure and the station structure are relatively independent, and the two different structural types do not interfere with each other;
[0023] 4. The underground station is relatively separated from the bridge structure system, and the external waterproofing system and vertical deformation of the station structure are completely independent; the bridge piles hardly generate vertical interaction forces with the station structure. Considering that the viaduct built first has basically completed the settlement, while the vertical deformation of the underground station has not yet stabilized, this scheme can well eliminate the effect of the post-construction vertical deformation of the later built underground station on the existing bridge, and ensure the safety of the operating bridge structure; vice versa, this scheme protects the external waterproofing layer of the station structure, avoids the development of cracks in the station structure due to the settlement difference of the existing bridge structure, and thus improves the durability of the station structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 It is an elevation view of the present invention;
[0025] Figure 2 This is the plan view of the concrete cylinder wall at the floor elevation;
[0026] Figure 3 This is a typical cross-section diagram of a bridge pile passing through the vertical space of a station;
[0027] Figure 4 This is the construction sequence diagram of the concrete cylinder wall;
[0028] In the figure: 1-0, covering soil; 1-1, viaduct piles; 1-2, viaduct pedestals; 1-3, viaduct piers; 1-4, viaduct deck; 2-1, station ground-connected wall; 2-2, station stand column piles; 2-3, station roof; 2-4, station middle plate; 2-5, station upper side wall; 2-6, station floor; 2-7, station lower side wall; 2-8, station external waterproofing layer; 3, concrete cylinder wall; 3-1, lower cylinder wall; 3-2, upper cylinder wall; 3-3, foam concrete; 3-4, concrete support block; 3-5, U-shaped reinforcement. DETAILED DESCRIPTION
[0029] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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.
[0030] like Figure 1-4As shown, an underground station structure under an existing viaduct of the present invention is located below an existing viaduct 1, and includes a station ground-connected wall 2-1, a station stand column pile 2-2, a station top plate 2-3, a station middle plate 2-4, a station upper side wall 2-5, a station bottom plate 2-6, a station lower side wall 2-7 and a concrete cylinder wall 3. The station ground-connected wall 2-1 and the station stand column pile 2-2 are vertically arranged on the ground below the viaduct deck 1-4 of the viaduct 1, and the station stand column pile 2-2 is arranged between the station ground-connected walls 2-1 on both sides; the station ground-connected walls 2-1 on both sides are horizontally arranged on the station top plate 2-3, the station middle plate 2-4 and the station A station upper side wall 2-5 connected to the station middle plate 2-4 is provided between the station top plate 2-3 and the station ground-connected wall 2-1, and a station lower side wall 2-7 connected to the station bottom plate 2-6 is provided between the station middle plate 2-4 and the station ground-connected wall 2-1; the viaduct piles 1-1 of the viaduct 1 pass through the station top plate 2-3, the station middle plate 2-4 and the station bottom plate 2-6 from top to bottom in sequence, and a vertically arranged concrete cylinder wall 3 is provided between the viaduct piles 1-1 and the underground station 2; the viaduct piles 1-1 are surrounded by the concrete cylinder wall 3, vertically pass through the underground station 2, and are in a stress state of horizontal constraint and vertical separation with the underground station 2.
[0031] In this embodiment, the concrete cylinder wall 3 includes a lower cylinder wall 3-1 and an upper cylinder wall 3-2. The lower cylinder wall 3-1 is arranged between the station middle plate 2-4 and the station bottom plate 2-6, and the upper cylinder wall 3-2 is arranged between the station top plate 2-3 and the station middle plate 2-4.
[0032] In this embodiment, a plurality of concrete support blocks 3-4 are arranged at the floor elevation positions of the station top plate 2-3, the station middle plate 2-4 and the station bottom plate 2-6 to form horizontal constraints on the viaduct piles 1-1; the concrete support blocks 3-4 are arranged between the concrete cylinder wall 3 and the viaduct piles 1-1.
[0033] In this embodiment, the concrete support block 3 - 4 includes U-shaped reinforcement 3 - 5 anchored in the concrete cylinder wall 3 .
[0034] In this embodiment, the gap between the concrete cylinder wall 3 and the viaduct piles 1-1 is filled with foam concrete 3-3, and the foam concrete 3-3 also serves as the inner formwork for the construction of the concrete cylinder wall 3; the backfill foam concrete 3-3 adopts model FCA05-C1-W5-S; the concrete cylinder wall 3 is the outer wall of the underground station 2, and the viaduct piles 1-1 pass through the outside of the underground station 2 structure into the deep strata. The viaduct 1 and the underground station 2 are completely separated and the forces are relatively independent, and the two different structural types do not interfere with each other.
[0035] In this embodiment, the concrete support block 3-4 is fixed between the concrete cylinder wall 3 and the viaduct pile 1-1 by using the foam concrete 3-3 filled and solidified; in order to solve the problem that the viaduct pile 1-1 passes through the main structure space of the underground station 2, after the bottom of the foundation pit of the underground station 2 is sealed, the concrete cylinder wall 3 structure is built from bottom to top to wrap the viaduct pile 1-1, and the surface of the viaduct pile 1-1 inside the concrete cylinder wall 3 is rounded, coated with interface oil and wrapped with hemp silk, and then filled with foam concrete 3-3, so as to ensure that the concrete cylinder wall 3 of the underground station 2 and the viaduct pile 1-1 of the existing viaduct 1 are vertically independent of each other, and the cylinder wall also serves as a permanent column of the station structure.
[0036] In this embodiment, a station outer waterproof layer 2-8 is laid on the surface of the foam concrete 3-3, which is beneficial to the durability of the overall structure of the underground station 2.
[0037] In this embodiment, the main structure of the underground station 2 is mainly made of C35 concrete, and the station ground-connected wall 2-1, the station column piles 2-2 and the concrete cylinder wall 3 are made of C50 concrete; the concrete cylinder wall 3 is a 500mm thick exterior wall with a P8 waterproof grade.
[0038] The main structure of underground station 2 is located below the main structure of existing viaduct 1. Viaduct 1 is implemented in sequence in advance. Viaduct 1 includes viaduct piles 1-1, viaduct pedestals 1-2, viaduct piers 1-3 and viaduct deck 1-4. Viaduct piles 1-1 are set vertically and vertically pass through underground station 2; viaduct pedestals 1-2 are located underground and set on the top of viaduct piles 1-1; viaduct piers 1-3 pass through the ground and are set on viaduct pedestals 1-2; viaduct deck 1-4 is located above the ground and is set on viaduct pedestals 1-2. The arrangement of viaduct piles 1-1 is not affected by the implementation plan of underground station 2. It is only necessary to consider the side friction loss of subsequent foundation pit excavation when designing the pile length, and end bearing piles are preferably used.
[0039] A construction method of an underground station structure under an existing viaduct of the present invention comprises the following steps:
[0040] S1. Build the station ground-connected wall 2-1 and the station stand column pile 2-2 below the viaduct deck 1-4, and then carry out the reverse excavation of the foundation pit; first excavate the covering soil 1-0 to below the station top plate 2-3, build the station top plate 2-3, and after the station top plate 2-3 has formed strength, backfill the covering soil 1-0 to restore the ground layer traffic;
[0041] S2, dig down to the bottom of the station middle plate 2-4, construct the station middle plate 2-4, and after the station middle plate 2-4 has formed strength, construct the side wall of the station upper layer 2-5 to form the station upper structure;
[0042] S3, continue to dig down to the bottom of the foundation pit, construct the station floor 2-6, and after the station floor 2-6 has formed strength, construct the side wall of the lower layer 2-7 of the station to complete the bottom cover of the underground station 2;
[0043] S4. After the bottom of the underground station 2 is completed, the concrete cylinder wall 3 is constructed from bottom to top. The filled foam concrete 3-3 is used as the inner formwork of the concrete cylinder wall 3, and the lower cylinder wall 3-1 and the upper cylinder wall 3-2 are constructed from bottom to top.
[0044] The above steps are based on the industry's cover-excavation reverse approach. During the excavation of the foundation pit, the viaduct piles 1-1 are exposed as the foundation pit is excavated. In order to ensure the operational safety of the viaduct 1, it is necessary to add horizontal support constraints to it while not generating vertical interaction forces with it. The specific approach is as follows:
[0045] like Figure 2 As shown, concrete support blocks 3-4 need to be set at the floor elevations of the station top plate 2-3, the station middle plate 2-4 and the station bottom plate 2-6 to form horizontal constraints on the viaduct bridge piles 1-1. The recommended interval between the concrete cylinder wall 3 and the viaduct bridge piles 1-1 is 300mm. The surface of the viaduct bridge piles 1-1 needs to be rounded, coated with interface oil and wrapped with hemp to ensure that the surface of the bridge piles is smooth and does not generate vertical interaction forces with the station; then fill with foam concrete 3-3; foam concrete 3-3 also serves as the inner formwork for the construction of the concrete cylinder wall 3.
[0046] like Figure 3 As shown, after the bottom of the underground station 2 is completed, the concrete cylinder wall 3 is implemented from bottom to top; the filled foam concrete 3-3 is used as the inner formwork of the concrete cylinder wall 3, and the lower cylinder wall 3-1 and the upper cylinder wall 3-2 are constructed from bottom to top in sequence; the viaduct pile 1-1 is completely enclosed by the concrete cylinder wall 3, vertically passing through the underground station 2, and presents a stress state of horizontal constraint + vertical separation with the underground station 2.
[0047] It is recommended that the concrete support block 3-4 be prefabricated on site using C35 concrete with a waterproof grade of P8, and placed at the floor plate elevation of the viaduct pile 1-1, and fixed by the filled and cured foam concrete 3-3; Figure 4 As shown, subsequently, the station outer waterproof layer 2-8 is laid on the surface of the foam concrete 3-3, and after the waterproof acceptance, the concrete cylinder wall 3 is cast in a mold; the concrete support block 3-4 can be provided with a U-shaped reinforcement 3-5 structure anchored in the concrete cylinder wall 3, and the U-shaped reinforcement 3-5 can be made of 4 HPB300 steel bars with a diameter of 12mm.
[0048] It should be noted that the description of the above technical solutions is exemplary, and this specification can be embodied in different forms and should not be interpreted as being limited to the technical solutions set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solutions of the present invention are limited only by the scope of the claims.
[0049] Finally, it should be pointed out that the above embodiments are only representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there are many variations. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be considered to belong to the protection scope of the present invention.
Claims
1. An underground station structure under an existing viaduct, characterized in that: Located below an existing viaduct (1), the station comprises a station ground-connected wall (2-1), a station stand column pile (2-2), a station top plate (2-3), a station middle plate (2-4), a station upper side wall (2-5), a station bottom plate (2-6), a station lower side wall (2-7) and a concrete cylinder wall (3), wherein the station ground-connected wall (2-1) and the station stand column pile (2-2) are vertically arranged on the ground below the viaduct deck (1-4) of the viaduct (1), and the station stand column pile (2-2) is arranged between the station ground-connected walls (2-1) on both sides; between the station ground-connected walls (2-1) on both sides, horizontally arranged station top plate (2-3), station middle plate (2-4) and station bottom plate (2-6) are arranged in sequence from top to bottom, and the station top plate (2 -3) and the station ground-connected wall (2-1) are provided with an upper side wall (2-5) of the station connected to the station middle plate (2-4); and a lower side wall (2-7) of the station connected to the station bottom plate (2-6) is provided between the station middle plate (2-4) and the station ground-connected wall (2-1); the viaduct piles (1-1) of the viaduct (1) pass through the station top plate (2-3), the station middle plate (2-4) and the station bottom plate (2-6) in sequence from top to bottom; and a vertically arranged concrete cylinder wall (3) is provided between the viaduct piles (1-1) and the underground station (2); the viaduct piles (1-1) are surrounded by the concrete cylinder wall (3), vertically pass through the underground station (2), and are in a stress state of horizontal constraint and vertical separation with the underground station (2).
2. The underground station structure under the existing viaduct according to claim 1, characterized in that: The concrete cylindrical wall (3) comprises a lower cylindrical wall (3-1) and an upper cylindrical wall (3-2), wherein the lower cylindrical wall (3-1) is arranged between a station middle plate (2-4) and a station bottom plate (2-6), and the upper cylindrical wall (3-2) is arranged between a station top plate (2-3) and a station middle plate (2-4).
3. The underground station structure under the existing viaduct according to claim 1, characterized in that: A plurality of concrete support blocks (3-4) are arranged at the floor plate elevation positions of the station top plate (2-3), the station middle plate (2-4) and the station bottom plate (2-6) to form horizontal constraints on the viaduct piles (1-1); the concrete support blocks (3-4) are arranged between the concrete cylinder wall (3) and the viaduct piles (1-1).
4. The underground station structure under the existing viaduct according to claim 3, characterized in that: The concrete support block (3-4) comprises a U-shaped rib (3-5) anchored in the concrete cylinder wall (3).
5. The underground station structure under the existing viaduct according to claim 3, characterized in that: The gap between the concrete cylinder wall (3) and the viaduct pile (1-1) is filled with foam concrete (3-3), and the foam concrete (3-3) also serves as an inner template for the construction of the concrete cylinder wall (3).
6. The underground station structure under the existing viaduct according to claim 4, characterized in that: The concrete support block (3-4) is fixed between the concrete cylinder wall (3) and the viaduct pile (1-1) by using the filled and cured foam concrete (3-3).
7. The underground station structure under the existing viaduct according to claim 3, characterized in that: The surface of the foamed concrete (3-3) is provided with a station outer waterproof layer (2-8).
8. The underground station structure under the existing viaduct according to claim 1, characterized in that: The main structure of the underground station (2) is mainly made of C35 concrete, and the station ground-connected wall (2-1), station column piles (2-2) and concrete cylinder wall (3) are made of C50 concrete; the concrete cylinder wall (3) is a 500mm thick exterior wall with a P8 waterproof grade.
9. A construction method for an underground station structure under an existing viaduct as claimed in any one of claims 1 to 8, comprising the following steps: S1. Build the station ground-connected wall (2-1) and the station stand column pile (2-2) below the viaduct deck (1-4), and then carry out the reverse excavation of the foundation pit; first, excavate the covering soil (1-0) to the bottom of the station top plate (2-3), and build the station top plate (2-3). After the station top plate (2-3) has formed strength, backfill the covering soil (1-9) and restore the ground traffic; S2, dig down to the bottom of the station middle plate (2-4), construct the station middle plate (2-4), and after the station middle plate (2-4) has formed strength, construct the side wall of the station upper layer (2-5) to form the station upper structure; S3, continue to dig downward to the bottom of the foundation pit, construct the station floor (2-6), and after the station floor (2-6) has formed strength, construct the side wall of the lower layer (2-7) of the station to complete the bottom cover of the underground station (2); S4. After the bottom of the underground station (2) is sealed, the concrete cylinder wall (3) is constructed from bottom to top; the filled foam concrete (3-3) is used as the inner formwork of the concrete cylinder wall (3), and the lower cylinder wall (3-1) and the upper cylinder wall (3-2) are constructed in sequence from bottom to top.
10. The construction method of the underground station structure under the existing viaduct according to claim 9, characterized in that: During the excavation of the foundation pit, the viaduct piles 1-1 are exposed as the foundation pit is excavated to supplement the horizontal support constraints. At the same time, the horizontal support does not generate vertical force with the viaduct piles (1-1).