A column base node for an assembled subway station and a construction method thereof

Abstract

The present invention discloses a column base node for an assembled subway station and a construction method thereof, wherein the column base node comprises an upper mortise base, a lower mortise base and a plurality of energy-absorbing components; the upper mortise base and the lower mortise base are spaced apart from each other, and the plurality of energy-absorbing components are evenly arranged between the upper mortise base and the lower mortise base; a mortise joint is provided at the bottom end of the prefabricated column, the upper end of the mortise joint is fixed to the bottom end of the prefabricated column, and the lower end passes through the upper mortise base and the lower mortise base in sequence; the present invention relaxes the rotation constraint of the foundation on the column bottom interface at the interface between the column bottom and the foundation by inserting the mortise joint into the mortise base, so that the column bottom interface can rotate freely; by arranging the energy-absorbing components, the energy-absorbing components can yield before other adjacent components, thereby dissipating earthquake energy; the column base node can not only transmit axial force and play a supporting role, but also absorb earthquake energy and has a highly efficient earthquake-resistant effect; the column base node has clear force transmission characteristics and is replaceable when damaged by earthquake.

Description

Technical Field

[0001] The present invention belongs to the technical field of prefabricated buildings, and in particular relates to a column base node for a prefabricated subway station and a construction method thereof. Background Art

[0002] Subway stations are crucial structures in the underground railway network, ensuring the smooth operation of railway system equipment and crucial functions for passenger gathering, transfers, and waiting. Currently, the cast-in-place reinforced concrete structures used in their main structures present numerous construction challenges, including high formwork requirements, material waste and inability to guarantee quality, slow construction speeds, large floor space requirements that can easily impact surrounding areas, inability to guarantee quality during winter, and the generation of significant amounts of construction waste. Therefore, intelligent innovation in both model and technology is needed for subway station construction—prefabricated subway stations are the future direction of development.

[0003] Existing prefabricated subway stations still involve a large amount of wet operations, which seriously affects the construction progress. As an emerging underground building structure, prefabricated subway stations are at a primary level in terms of assembly degree, connection efficiency and construction speed, and are unable to give full play to the advantages of prefabricated construction.

[0004] The key seismic weakness of prefabricated concrete frame structures is the connection parts. The quality of the connection performance determines the integrity and seismic resistance of the entire structure. Prefabricated concrete frame nodes using common wet connections and dry connections cannot simultaneously meet the mechanical properties, construction efficiency and energy consumption and shock absorption requirements, and cannot achieve rapid replacement and repair after an earthquake.

[0005] The central columns and side wall-floor connections of subway station structures are significantly affected by earthquakes. The columns are the weakest components in the entire station. The collapse of station structures is often due to the mismatch between the deformation capacity of the central columns and side walls, resulting in shear failure. This is accompanied by high soil pressure on the top slab, causing the top slab to collapse. Therefore, the seismic design of the central columns is the most important part of the entire subway seismic design. Summary of the Invention

[0006] In response to the technical problems existing in the prior art, the present invention provides a column base node for prefabricated subway stations and a construction method thereof, so as to solve the problems that most existing prefabricated structural nodes adopt wet connection, which has low construction efficiency, cannot guarantee construction quality, and has too many steel bars in the node area; the existing dry connection construction is difficult, cannot simultaneously meet the requirements of mechanical properties, construction efficiency and energy consumption and shock absorption, and cannot achieve rapid replacement and repair after an earthquake.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] The present invention provides a column base node for an assembled subway station, wherein the column base node is arranged between a prefabricated column and a foundation; the column base node includes an upper mortise base, a lower mortise base, and a plurality of energy-absorbing components; the upper mortise base and the lower mortise base are spaced apart from each other, and the plurality of energy-absorbing components are evenly arranged between the upper mortise base and the lower mortise base;

[0009] The upper end of the upper mortise base is fixedly connected to the bottom end of the prefabricated column, and the lower end of the upper mortise base is connected to the upper end of the energy-absorbing component; the lower end of the energy-absorbing component is fixedly connected to the upper end of the lower mortise base, and the lower end of the lower mortise base is fixedly connected to the foundation;

[0010] The bottom end of the prefabricated column is provided with a mortise joint, the upper end of the mortise joint is fixed to the bottom end of the prefabricated column, and the lower end is inserted into the upper mortise base and the lower mortise base in sequence.

[0011] Furthermore, it also includes a steel frame connecting sleeve; the steel frame connecting sleeve is arranged on the outer side of the bottom end of the prefabricated column, and the lower end of the steel frame connecting sleeve is fixedly connected to the upper mortise base.

[0012] Furthermore, the steel frame connecting sleeve and the upper mortise base are fixed by welding.

[0013] Furthermore, a plurality of bolts are evenly arranged between the upper mortise base and the prefabricated column, the lower ends of the bolts are welded and fixed to the upper mortise base, and the upper ends are embedded in the prefabricated column.

[0014] Furthermore, the upper mortise base and the lower mortise base are both rectangular steel blocks, and the cross-section of the rectangular steel block matches the cross-section of the prefabricated column; a mortise hole is provided in the middle of the steel block structure, and the mortise joint is inserted into the mortise hole; the four sides of the mortise joint are in close contact with the inner wall of the mortise hole, and the bottom end of the mortise joint is in close contact with the foundation surface.

[0015] Furthermore, the energy-absorbing component is connected to the upper mortise base and the lower mortise base respectively by high-strength bolts.

[0016] Furthermore, bolt hand holes are respectively provided around the upper mortise base and the lower mortise base.

[0017] Furthermore, the energy-absorbing component includes an upper end plate, a lower end plate, a support plate, an energy-absorbing plate and a rib plate; the upper end plate and the lower end plate are arranged parallel and spaced apart from each other; the upper end plate is fixedly connected to the upper mortise base, and the lower end plate is fixedly connected to the lower mortise base; the support plate is vertically and parallelly arranged between the upper end plate and the lower end plate, the energy-absorbing plate is parallel to the side wall of the prefabricated column, and is located between the two support plates, and a through hole is provided on the energy-absorbing plate; rib plates are respectively arranged on both sides of the middle part of the energy-absorbing plate.

[0018] Furthermore, the precast columns are reinforced concrete precast columns; and the mortise and tenon joints are steel tube concrete precast columns.

[0019] The present invention also provides a construction method for a column base node of an assembled subway station, comprising the following steps:

[0020] Process and manufacture upper mortise base, lower mortise base and energy-consuming components according to design requirements;

[0021] Process and manufacture prefabricated columns, and securely connect the upper mortise base to the prefabricated columns;

[0022] Hoist the lower mortise base to the foundation to be installed, and securely connect the lower mortise base to the foundation;

[0023] Hoist the prefabricated column and align the mortise joint at the bottom of the prefabricated column with the lower mortise base;

[0024] The energy-absorbing component is evenly fixed and installed between the upper mortise base and the lower mortise base.

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

[0026] The present invention provides a column base node for an assembled subway station and a construction method thereof. By arranging a mortise joint at the bottom end of a prefabricated column, the mortise joint is inserted into a mortise base, and at the interface between the column base and the foundation, the rotation constraint of the foundation on the column base interface is relaxed, so that the column base interface can "rotate freely". At this interface, the column base cross section and the foundation surface are separated from each other, so that the traditional rigid connection is converted into a "swing connection"; by arranging an energy-absorbing component, the energy-absorbing component can yield before other adjacent components, thereby dissipating seismic energy; at the same time, the present invention has a certain bearing capacity and rigidity, can not only transmit axial force and play a supporting role, but also can absorb seismic energy and has a highly effective seismic resistance; the column base node has clear force transmission, simple structure, convenient installation, and is replaceable in case of earthquake damage.

[0027] Furthermore, a steel frame connecting sleeve fixing sleeve is arranged on the outer side of the bottom end of the prefabricated column and fixedly connected to the upper mortise base; thereby ensuring a stable connection between the column foot node and the prefabricated column and improving the integrity of the structure.

[0028] Furthermore, a number of studs are evenly arranged between the upper mortise base and the prefabricated column, which effectively improves the shear resistance of the column foot node.

[0029] Furthermore, the energy-absorbing component is connected to the upper mortise base and the lower mortise base respectively with high-strength bolts, which facilitates quick disassembly and replacement after an earthquake.

[0030] Furthermore, by providing bolt hand holes around the mortise base, on-site installation and construction are facilitated, and the flatness of the node is effectively improved.

[0031] Furthermore, the supporting capacity and rigidity of the energy-absorbing components are effectively improved by setting support plates. By opening through holes in the energy-absorbing plates and weakening the components, the components are plastically deformed during earthquakes, effectively absorbing earthquake energy. The energy-absorbing components have a simple structure and are easy to replace after an earthquake.

[0032] The present invention discloses a column base node for an assembled subway station and a construction method thereof. By arranging a mortise joint at the bottom end of a prefabricated column, the mortise joint adopts a steel tube concrete structure, which effectively reduces the amount of steel used in the column base. The mortise joint is inserted into the mortise base. At the interface between the column base and the foundation, the rotation constraint of the foundation on the column base section is relaxed, so that the column base section and the foundation surface can be separated from each other at the interface, so that the traditional "rigid" connection is changed to a "swinging" connection. The prefabricated column is connected to the foundation only through the column base node. The energy-consuming components in the column base node yield before their adjacent components, and plastic deformation occurs. The purpose of dissipating earthquake energy is achieved through deformation; the energy-absorbing components are designed by drawing on the idea of connecting beams; the energy-absorbing components themselves have a certain bearing capacity and rigidity, which can not only transmit axial forces and play a supporting role, but also absorb earthquake energy through plastic deformation of their weakened parts when an earthquake occurs. Moreover, because they are connected by high-strength bolts, they can be disassembled and replaced conveniently and quickly after the earthquake; the assembly speed is increased, and the deformation capacity of the middle column can be improved, so that the middle column and the side wall can be deformed in coordination, so as to achieve the effect of improving the overall seismic resistance of the underground frame structure; the column bottom node has clear force transmission, simple structure, high energy consumption, and is replaceable due to earthquake damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the overall structure of the column foot node according to the present invention;

[0034] Figure 2 It is an enlarged schematic diagram of the local structure of the column foot node according to the present invention;

[0035] Figure 3 This is a schematic diagram of the first mortise base structure in the column foot node of the present invention;

[0036] Figure 4 This is a schematic diagram of the structure of the prefabricated column and the tenon joint in the column base node of the present invention;

[0037] Figure 5 This is a schematic diagram of the tenon joint structure in the column base node of the present invention;

[0038] Figure 6 This is a schematic diagram of the internal structure of the steel frame connecting sleeve in the column base node of the present invention;

[0039] Figure 7 This is a schematic diagram of the prefabricated column structure in the column foot node of the present invention;

[0040] Figure 8 This is a schematic diagram of the structure of the energy-consuming component in the column base node described in the present invention.

[0041] Among them, 1 is an upper mortise base, 2 is a lower mortise base, 3 is an energy-absorbing component, 4 is a steel frame connecting sleeve, 5 is a prefabricated column, 6 is a foundation; 31 is an upper end plate, 32 is a lower end plate, 33 is a support plate, 34 is an energy-absorbing plate, 35 is a rib plate; 51 is a mortise and tenon joint. DETAILED DESCRIPTION

[0042] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail in the following specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0043] As attached Figure 1-8 As shown, the present invention provides a column base node for an assembled subway station, wherein the column base node is arranged between a prefabricated column 5 and a foundation 6; the column base node includes an upper mortise base 1, a lower mortise base 2, a plurality of energy-absorbing components 3 and a steel frame connecting sleeve 4; the upper mortise base 1 and the lower mortise base 2 have the same structure, the upper mortise base 1 and the lower mortise base 2 are spaced apart from each other, and the plurality of energy-absorbing components 3 are evenly arranged between the upper mortise base 1 and the lower mortise base 2; the steel frame connecting sleeve 4 is fixedly sleeved on the outside of the bottom end of the prefabricated column 5, and the lower end of the steel frame connecting sleeve 4 is fixedly connected to the upper mortise base 1.

[0044] The upper end of the upper mortise base 1 is fixedly connected to the bottom end of the prefabricated column 5, and the lower end of the upper mortise base 1 is fixedly connected to the upper end of the energy-absorbing component 3; the lower end of the energy-absorbing component 3 is fixedly connected to the upper end of the lower mortise base 2, and the lower end of the lower mortise base 2 is fixedly connected to the foundation 6; a mortise joint 51 is provided at the bottom end of the prefabricated column 5, the upper end of the mortise joint 51 is fixedly connected to the bottom end of the prefabricated column 5, and the lower end is sequentially inserted into the upper mortise base 1 and the lower mortise base 2, the four sides of the mortise joint 51 are in close contact with the upper mortise base 1 and the lower mortise base 3, and the lower end face of the mortise joint 51 is in close contact with the surface of the foundation 6; preferably, the prefabricated column 5 is a reinforced concrete structure, the mortise joint 51 is a steel tube concrete structure, and the mortise joint 51 and the prefabricated column 5 are prefabricated as a whole.

[0045] In the present invention, the prefabricated column 5 is a reinforced concrete prefabricated column, including a structural steel cage and concrete; the lower end of the prefabricated column 5 is fixed to the upper mortise base 1 by welding through a steel frame connecting sleeve 4.

[0046] The upper mortise base 1 and the lower mortise base 2 are both rectangular steel blocks, and the cross-section of the rectangular steel block matches the cross-section of the prefabricated column 5; a mortise hole is set in the middle of the steel block structure, and the mortise joint 51 is inserted into the mortise hole; the four sides of the mortise joint 51 are in close contact with the inner wall of the mortise hole, and the bottom end of the mortise joint 51 is in close contact with the foundation surface.

[0047] The energy-absorbing component 3 includes an upper end plate 31, a lower end plate 32, a support plate 33, an energy-absorbing plate 34 and a rib plate 35; the upper end plate 31 and the lower end plate 32 are arranged parallel and spaced apart from each other; the upper end plate 31 is fixedly connected to the upper mortise base 1, and the lower end plate 32 is fixedly connected to the lower mortise base 2; the support plate 33 is vertically parallel and arranged between the upper end plate 31 and the lower end plate 32, the support plate 33 is perpendicular to the side wall of the prefabricated column 5 and parallel to the axis of the prefabricated column 5; the upper end of the support plate 33 is fixedly connected to the upper end plate 31, and the lower end is fixedly connected to the lower end plate 32; the energy-absorbing plate 34 is parallel to the side wall of the prefabricated column 5 and is located between the two support plates 33, and a through hole is provided on the energy-absorbing plate 34; the upper and lower ends of the energy-absorbing plate 34 are welded to the upper end plate 31 and the lower end plate 32 respectively, and the two sides are welded to the two support plates 33 respectively; rib plates 35 are respectively provided on both sides of the middle part of the energy-absorbing plate 34.

[0048] In the present invention, by providing energy-absorbing components, the energy-absorbing components can yield before other adjacent components, thereby achieving the purpose of dissipating seismic energy; supporting plates 33 are provided on both sides of the energy-absorbing plate 34, thereby improving the bearing capacity and stiffness of the energy-absorbing components, ensuring that they can not only transmit axial force and play a supporting role, but also absorb seismic energy and have a highly efficient seismic resistance.

[0049] The upper mortise base 1 and the upper end plate 31 are fixedly connected by high-strength bolts. An upper bolt hole is provided on the upper mortise base 1. The high-strength bolt passes through the upper end plate 31 and is fixedly set in the upper bolt hole to fix the upper end plate 31 and the upper mortise base 1 together.

[0050] The lower mortise base 2 and the lower end plate 32 are fixedly connected by high-strength bolts. A lower bolt hole is provided on the lower mortise base 2. The high-strength bolt passes through the lower end plate 32 and is fixedly set in the lower bolt hole, thereby fixing the lower end plate 32 and the lower mortise base 2 together; the foundation 6 is fixedly connected to the lower mortise base 2 by welding; preferably, the present invention includes four energy-absorbing components 3, and the four energy-absorbing components 3 are symmetrically arranged around the precast steel tube concrete column.

[0051] In the present invention, bolt hand holes are evenly arranged in the middle of the four sides of the upper mortise base 1 and the lower mortise base 2 for fixing high-strength bolts; in the present invention, high-strength bolts are used to connect the energy-absorbing component to the upper mortise base 1 or the lower mortise base 2, which is easy to install and convenient for quick disassembly and replacement after an earthquake; by arranging bolt hand holes around the mortise base, on-site installation and construction are facilitated, and the flatness and aesthetics of the node are effectively improved.

[0052] The steel frame connecting sleeve 4 adopts a hollow frame structure formed by welding and fixing several steel plates and steel columns. The upper end of the steel frame connecting sleeve 4 is open, and the bottom end of the prefabricated column 5 is inserted into the steel frame connecting sleeve 4; the steel frame connecting sleeve is arranged on the outside of the bottom end of the prefabricated column and fixedly connected to the upper mortise base; this ensures a stable connection between the column foot node and the prefabricated column, thereby improving the integrity of the structure.

[0053] In the present invention, by arranging a mortise joint 51 at the bottom end of the prefabricated column 5, the mortise joint 51 is inserted into the mortise base, and at the interface between the column bottom and the foundation, the rotation constraint of the foundation on the column bottom interface is relaxed, so that it can rotate freely. At this interface, the column bottom cross section and the foundation surface are separated from each other, so that the traditional rigid connection is converted into a "swing connection"; at the same time, the present invention has a certain bearing capacity and rigidity, which can not only transmit axial force and play a supporting role, but also absorb earthquake energy and has a highly efficient earthquake-resistant effect; the column foot node has clear force transmission, simple structure, easy installation, and is replaceable if damaged by earthquake.

[0054] Construction process

[0055] The present invention provides a method for constructing a column base node for an assembled subway station, comprising the following steps:

[0056] Step 1: Process and manufacture the upper mortise base 1, the lower mortise base 2 and the energy-consuming component 3 according to the design requirements.

[0057] Step 2: Process and manufacture the prefabricated column 5, and fix the upper mortise base 1 to the prefabricated column 5 together; preferably, when the prefabricated column 5 is cast, a steel frame connecting sleeve 4 is set at the column foot of the prefabricated column 5, and the upper end of the steel frame connecting sleeve is buried in the prefabricated column 5, and the lower end is exposed for welding and fixing with the upper mortise base 1.

[0058] Step 3: Hoist the lower mortise base 2 to the foundation to be installed, and weld the lower mortise base 2 to the foundation 6 for fixed connection;

[0059] Step 4: Hoist the prefabricated column and align the mortise joint at the bottom of the prefabricated column with the lower mortise base 2 so that the mortise joint 51 is inserted into the mortise holes of the upper mortise base 1 and the lower mortise base 2 in sequence; finally, use high-strength bolts to evenly fix the energy-absorbing component 3 between the upper mortise base 1 and the lower mortise base 2.

[0060] The column base node described in the present invention is a prefabricated column connected to the foundation only through the column base node. The energy-absorbing components in the column base node yield before their adjacent components and undergo plastic deformation to achieve the purpose of dissipating earthquake energy. The energy-absorbing components are designed by drawing on the concept of connecting beams. The energy-absorbing components themselves have a certain bearing capacity and rigidity, which can not only transmit axial force and play a supporting role, but also absorb earthquake energy through the plastic deformation of their weakened parts when an earthquake occurs. Moreover, because they are connected by high-strength bolts, they can be disassembled and replaced conveniently and quickly after the earthquake. The assembly speed is increased, and the deformation capacity of the middle column can be improved, so that the middle column and the side wall deform in coordination, thereby achieving the effect of improving the overall seismic resistance of the underground frame structure. The column base node has clear force transmission, simple structure, high energy consumption, and is replaceable in case of earthquake damage.

[0061] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited only to this embodiment, but also includes changes, replacements and other implementation methods that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention.

Claims

1. A column base node for an assembled subway station, characterized in that: The column foot node is arranged between the prefabricated column (5) and the foundation (6); the column foot node comprises an upper mortise base (1), a lower mortise base (2) and a plurality of energy-consuming components (3); the upper mortise base (1) and the lower mortise base (2) are arranged with a vertical interval, and the plurality of energy-consuming components (3) are evenly arranged between the upper mortise base (1) and the lower mortise base (2); The upper end of the upper mortise base (1) is fixedly connected to the bottom end of the prefabricated column (5), and the lower end of the upper mortise base (1) is connected to the upper end of the energy-consuming component (3); the lower end of the energy-consuming component (3) is fixedly connected to the upper end of the lower mortise base (2), and the lower end of the lower mortise base (2) is fixedly connected to the foundation (6); The bottom end of the prefabricated column (5) is provided with a mortise joint (51), the upper end of the mortise joint (51) is fixed to the bottom end of the prefabricated column (5), and the lower end is sequentially inserted into the upper mortise base (1) and the lower mortise base (2); It also includes a steel frame connecting sleeve (4); the steel frame connecting sleeve (4) is fixedly mounted on the outside of the bottom end of the prefabricated column (5), and the lower end of the steel frame connecting sleeve (4) is fixedly connected to the upper mortise base (1); The energy-consuming component (3) comprises an upper end plate (31), a lower end plate (32), a support plate (33), an energy-consuming plate (34) and a rib plate (35); the upper end plate (31) and the lower end plate (32) are arranged parallel to each other in an upper and lower direction and spaced apart; the upper end plate (31) is fixedly connected to the upper mortise base (1), and the lower end plate (32) is fixedly connected to the lower mortise base (2); the support plate (33) is vertically arranged parallel to each other between the upper end plate (31) and the lower end plate (32); the energy-consuming plate (34) is parallel to the side wall of the prefabricated column (5) and is located between the two support plates (33); a through hole is provided on the energy-consuming plate (34); and rib plates (35) are respectively arranged on both sides of the middle of the energy-consuming plate (34).

2. A column base node for a prefabricated subway station according to claim 1, characterized in that: The steel frame connecting sleeve (4) and the upper mortise base (1) are fixed by welding.

3. The column base node for a prefabricated subway station according to claim 1, characterized in that: A plurality of bolts are evenly arranged between the upper mortise base (1) and the prefabricated column (5); the lower ends of the bolts are welded and fixed to the upper mortise base (1), and the upper ends are embedded in the prefabricated column (5).

4. The column base node for a prefabricated subway station according to claim 1, characterized in that: The upper mortise base (1) and the lower mortise base (2) are both rectangular steel blocks, the cross section of which matches the cross section of the prefabricated column (5); a mortise hole is provided in the middle of the steel block structure, and a mortise joint (51) is inserted into the mortise hole; the four sides of the mortise joint (51) are in close contact with the inner wall of the mortise hole, and the bottom end of the mortise joint (51) is in close contact with the foundation surface.

5. The column base node for a prefabricated subway station according to claim 1, characterized in that: The energy-consuming component (3) is connected to the upper mortise base (1) and the lower mortise base (2) respectively by adopting high-strength bolts.

6. The column base node for a prefabricated subway station according to claim 5, characterized in that: Bolt hand holes are respectively provided around the upper mortise base (1) and the lower mortise base (2).

7. The column base node for a prefabricated subway station according to claim 1, characterized in that: The prefabricated column (5) is a reinforced concrete prefabricated column; the mortise and tenon joint (51) is a steel tube concrete prefabricated column.

8. A construction method for a column base node of an assembled subway station according to any one of claims 1 to 7, characterized in that: The following steps are involved: According to the design requirements, the upper mortise base (1), the lower mortise base (2) and the energy-consuming component (3) are processed and manufactured; Processing and manufacturing a prefabricated column (5), and fixing the upper mortise base (1) and the prefabricated column (5) together; Hoisting the lower mortise base (2) to the foundation to be installed, and fixing the lower mortise base (2) to the foundation; Hoist the prefabricated column and align the mortise joint at the bottom end of the prefabricated column with the lower mortise base (2); The energy-consuming component (3) is evenly and fixedly installed between the upper mortise base (1) and the lower mortise base (2).

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