Precast electromagnetic arch shell structure and reconstruction method for large-span renovation of subway stations

Abstract

This invention discloses a prefabricated electromagnetic arch shell structure and reconstruction method for large-span renovation of subway stations. It includes multiple pairs of arch shell bearing units; one end of each arch shell bearing unit is fixed to the side of the top longitudinal beam via a top connecting steel plate, and the other end is fixed to a corbel structure on the side wall of the subway station used to support the middle plate. Magnetic anchor blocks are embedded on the inner side of the end where the arch shell bearing unit connects to the corbel structure. Steel tie rods are installed between the magnetic anchor blocks of each pair of arch shell bearing units. Low-resistance magnets with internal AC coils are installed at both ends of the steel tie rods. The AC coils are controlled by a power supply and intelligent control terminal to adjust the electromagnetic force by controlling the current strength as needed. During reconstruction, all arch shell bearing units are installed first; then, corresponding AC coils are installed at both ends of the steel tie rods; finally, a portion of the central column within the bearing range of the arch shell bearing units is removed to form a three-hinged arch load-bearing system. This invention saves on reconstruction materials, reduces the weight of the new structure, and improves reconstruction speed and construction efficiency.

Description

Technical Field

[0001] This invention relates to the field of subway station reconstruction technology, and in particular to a prefabricated electromagnetic arch shell structure and reconstruction method for large-span subway station reconstruction. Background Technology

[0002] Urban expansion underground is an inevitable trend in the development of international metropolises and a necessary path for cities to develop in a sustainable and ecological direction. Maximizing the potential of existing land and making rational use of urban underground space resources have become new development concepts in the field of underground space in the new era. Due to lagging urban planning, an increasing number of existing subway stations in the central urban area are facing an urgent need to integrate with the commercial development of surrounding plots.

[0003] Therefore, adjusting the function of the underground station hall of existing subway stations has become an urgent industry problem that needs to be solved.

[0004] In particular, as cities continue to place higher demands on the use of underground space, the technical challenges of large-span reconstruction of existing subway stations to meet the complex functions and comprehensive utilization of urban underground space are becoming increasingly prominent.

[0005] However, in conventional subway stations, the frame columns are distributed discretely every 8-9 meters along the longitudinal direction of the station, and corresponding longitudinal frame beams are installed, thus forming a corresponding longitudinal frame transverse box-shaped double-span structure.

[0006] Moreover, due to the reserved underground pipelines for municipal roads, the subway station roof slab has a thick soil cover and a large load, which cannot be met by conventional reinforcement methods after removing the frame columns for large-span reconstruction, such as increasing the cross section, applying fiber cloth or steel plates.

[0007] Therefore, how to save on materials used in renovation, reduce the weight of new structures, and improve renovation speed and construction efficiency has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0008] In view of the above-mentioned deficiencies of the prior art, the present invention provides a prefabricated electromagnetic arch shell structure and reconstruction method for large-span reconstruction of subway stations, the purpose of which is to save on reconstruction materials, reduce the weight of the new structure, and improve reconstruction speed and construction efficiency.

[0009] To achieve the above objectives, the present invention discloses a prefabricated electromagnetic arch shell structure for large-span reconstruction of subway stations; the subway station includes a top slab and a top longitudinal beam for supporting the top slab.

[0010] The prefabricated electromagnetic arch shell structure includes multiple pairs of arch shell bearing units symmetrically arranged on both sides of the top longitudinal beam along the length of the top longitudinal beam.

[0011] Each of the arched shell bearing units is curved in an arc shape, with the concave side facing the inside of the subway station. One end is fixed to the side of the top longitudinal beam through a corresponding top connecting steel plate, and the other end is fixed to the corbel structure on the side wall of the subway station used to support the middle plate through a corresponding toe connecting steel plate.

[0012] A magnetic anchor block is embedded on the inner side of the connection end between each arch shell bearing unit and the corbel structure.

[0013] A steel tie rod is provided between the magnetic anchor blocks of each pair of arch shell bearing units;

[0014] Each of the steel tie rods has a low-resistance magnet with an internal AC coil installed between its two ends and the corresponding part of the arch shell bearing unit where the magnetic anchor block is located.

[0015] Each of the aforementioned AC coils is connected to the power supply and intelligent control terminal of the subway station, and the power supply and intelligent control terminal adjusts the magnitude of the electromagnetic force by controlling the strength of the current as needed.

[0016] Preferably, each of the arch shell bearing units is a reinforced concrete structure, and the internal reinforcing bars are respectively fixed to the corresponding top connecting steel plate and the corresponding toe connecting steel plate.

[0017] Preferably, each of the top connecting steel plates and each of the toe connecting steel plates is fixedly connected to the corresponding top longitudinal beam or the corresponding corbel structure by anchor bolts.

[0018] This invention also provides a method for the reconstruction of prefabricated electromagnetic arch shell structures for large-span reconstruction of subway stations, comprising the following steps:

[0019] Step 1: In the existing underground floor of the subway station, at the original frame column locations, complete the installation of all the arch shell bearing units;

[0020] Step 2: Install corresponding AC coils at both ends of each of the steel tie rods, and connect each AC coil through the corresponding steel tie rod to the power supply and intelligent control terminal of the subway station.

[0021] Step 3: Remove part of the central column within the bearing range of each pair of arch shell bearing units, and use the power supply and intelligent control terminal to make the corresponding AC coil generate the required magnetic force to form a three-hinged arch force system.

[0022] Preferably, the space enclosed by the prefabricated electromagnetic arch shell structure, the top slab, and the side walls of the subway station is used as a pipeline space, in which pipelines and conduits are installed.

[0023] The beneficial effects of this invention are:

[0024] The application of this invention can save on the materials used in the renovation, reduce the weight of the new structure, and improve the speed and efficiency of the renovation.

[0025] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. Attached Figure Description

[0026] Figure 1 This invention presents a schematic diagram of the subway station before its reconstruction.

[0027] Figure 2 This diagram shows a cross-sectional view of a subway station after renovation, according to one embodiment of the present invention.

[0028] Figure 3 This diagram illustrates the horizontal structure of a subway station after renovation, according to one embodiment of the present invention.

[0029] Figure 4 This diagram shows a partial cross-sectional view of the connection structure between each arch shell bearing unit and the top longitudinal beam in one embodiment of the present invention.

[0030] Figure 5 This diagram shows a partial cross-sectional view of the connection structure between each arch shell bearing unit and the corbel structure in one embodiment of the present invention. Detailed Implementation

[0031] Example

[0032] like Figures 1 to 5 As shown, a prefabricated electromagnetic arch shell structure is used for the large-span reconstruction of a subway station; the subway station includes a top slab 2 and a top longitudinal beam 3 for supporting the top slab 2.

[0033] Among them, the prefabricated electromagnetic arch shell structure includes multiple pairs of arch shell bearing units 5 symmetrically arranged on both sides of the top longitudinal beam 3 along the length direction of the top longitudinal beam 3;

[0034] Each arched shell bearing unit 5 is curved, with its concave side facing the inside of the subway station. One end is fixed to the side of the top longitudinal beam 3 through a corresponding top connecting steel plate 6, and the other end is fixed to the corbel structure 11 on the side wall of the subway station for supporting the middle plate 4 through a corresponding toe connecting steel plate 7.

[0035] Magnetic anchor blocks 13 are embedded on the inner side of the connection end between each arch shell bearing unit 5 and the corbel structure 11.

[0036] Each pair of arch shell bearing units 5 is equipped with a magnetic anchor block 13 and a steel tie rod 8 is provided between the parts;

[0037] Each steel tie rod 8 has a low-resistance magnet 15 with an internal AC coil 14 between its two ends and the corresponding arch shell bearing unit 5 where the magnetic anchor block 13 is located.

[0038] Each AC coil 14 is connected to the power supply and intelligent control terminal of the subway station. The power supply and intelligent control terminal adjusts the magnitude of the electromagnetic force by controlling the strength of the current according to the needs.

[0039] In practical applications, the end of each arch shell bearing unit 5 that is fixed to the top longitudinal beam 3 is mainly under pressure. The two ends of each steel tie rod 8 and the corresponding arch shell bearing unit 5 with magnetic anchor blocks 13 bear the horizontal thrust converted from the vertical load of the original frame column of the entire structural system. The changes in the electric field and magnetic field between the AC coil 14, the low-resistance magnet 15 and the magnetic anchor block 13 generate electromagnetic force to share the insufficient part of the horizontal thrust, forming a three-hinged arch force system.

[0040] The AC coil 14, which adjusts the magnitude of the electromagnetic force by controlling the current strength according to the power supply and intelligent control terminal, can realize the flexible design of the horizontal force and corresponding load-bearing parts of each pair of arch shell bearing units 5.

[0041] In some embodiments, each arch shell bearing unit 5 is a reinforced concrete structure, and the internal steel bars 10 are respectively fixed to the corresponding top connecting steel plate 6 and the corresponding toe connecting steel plate 7.

[0042] In some embodiments, each top connecting steel plate 6 and each toe connecting steel plate 7 are fixedly connected to the corresponding top longitudinal beam 3 or the corresponding corbel structure 11 by anchor bolts 12.

[0043] This invention also provides a method for the reconstruction of prefabricated electromagnetic arch shell structures for large-span reconstruction of subway stations, comprising the following steps:

[0044] Step 1: In the existing underground floor of the subway station, at the original frame column locations, complete the installation of all arch shell load-bearing units 5;

[0045] Step 2: Install corresponding AC coils 14 at both ends of each steel tie rod 8, and connect each AC coil 14 through the corresponding steel tie rod 8 to the power supply and intelligent control terminal of the subway station.

[0046] Step 3: Remove part of the central column 1 within the bearing range of each pair of arch shell bearing units 5, and use the power supply and intelligent control terminal to make the corresponding AC coil 14 generate the required magnetic force to form a three-hinged arch force system.

[0047] In some embodiments, the space enclosed by the prefabricated electromagnetic arch structure, the top slab 2, and the side walls of the subway station is used as a pipeline space 9, in which pipelines and conduits are installed.

[0048] This invention forms a prefabricated electromagnetic arch structure by setting multiple pairs of arch shell bearing units 5 on both sides of the original subway station's top longitudinal beam 3. The load is borne by a three-hinged arch force system. Part of the central column 1 within the bearing range of each pair of arch shell bearing units 5 is removed, so that the vertical load borne by the original subway station is converted into a horizontal force borne by multiple steel tie rods 8 at the bottom of the prefabricated electromagnetic arch structure. By setting a low-resistance magnet 15 with an internal AC coil 14 at the end of each steel tie rod 8, the electromagnetic force generated by the change of electric field and magnetic field is used to control the horizontal force of the corresponding arch shell bearing unit 5, thereby achieving large-span reconstruction with material saving, light weight, and quick construction.

[0049] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A prefabricated electromagnetic arch shell structure for large-span reconstruction of subway stations, the subway station comprising a top slab (2) and a top longitudinal beam (3) for supporting the top slab (2); characterized in that, The prefabricated electromagnetic arch shell structure includes multiple pairs of arch shell bearing units (5) symmetrically arranged on both sides of the top longitudinal beam (3) along the length direction of the top longitudinal beam (3); Each of the arch shell bearing units (5) is curved in an arc shape, with the concave side facing the inner side of the subway station. One end is fixed to the side of the top longitudinal beam (3) through a corresponding top connecting steel plate (6), and the other end is fixed to the corbel structure (11) of the side wall of the subway station used to support the middle plate (4) through a corresponding toe connecting steel plate (7). A magnetic anchor block (13) is embedded on the inner side of the connection end between each of the arch shell bearing unit (5) and the corbel structure (11). A steel tie rod (8) is provided between the magnetic anchor block (13) locations of each pair of arch shell bearing units (5). Each of the steel tie rods (8) has a low-resistance magnet (15) with an internal AC coil (14) between its two ends and the corresponding arch shell bearing unit (5) where the magnetic anchor block (13) is located. Each of the AC coils (14) is connected to the power supply and intelligent control terminal of the subway station, and the power supply and intelligent control terminal adjusts the magnitude of the electromagnetic force by controlling the strength of the current as needed.

2. The prefabricated electromagnetic arch shell structure for large-span reconstruction of subway stations according to claim 1, characterized in that, Each of the arch shell bearing units (5) is a reinforced concrete structure, and the internal steel bars (10) are fixed to the corresponding top connecting steel plate (6) and the corresponding toe connecting steel plate (7).

3. The prefabricated electromagnetic arch shell structure for large-span reconstruction of subway stations according to claim 1, characterized in that, Each of the top connecting steel plates (6) and each of the toe connecting steel plates (7) are fixedly connected to the corresponding top longitudinal beam (3) or the corresponding corbel structure (11) by anchor bolts (12).

4. The reconstruction method for prefabricated electromagnetic arch shell structures used in the large-span reconstruction of subway stations according to claim 1, characterized in that, Includes the following steps: Step 1: In the existing underground floor of the subway station, at the original frame column location, complete the installation of all the arch shell bearing units (5); Step 2: Set the corresponding AC coil (14) at both ends of each of the steel tie rods (8), and pass each of the AC coils (14) through the corresponding steel tie rod (8) and connect it to the power supply and intelligent control terminal of the subway station. Step 3: Remove part of the central column (1) within the bearing range of each pair of arch shell bearing units (5), and use the power supply and intelligent control terminal to make the corresponding AC coil (14) generate the required magnetic force to form a three-hinged arch force system.

5. The reconstruction method for prefabricated electromagnetic arch shell structures used in the large-span reconstruction of subway stations according to claim 4, characterized in that, The space enclosed by the prefabricated electromagnetic arch shell structure, the top plate (2), and the side wall of the subway station is used as a pipeline space (9) in which pipelines and conduits are installed.

Images