CN109853636B - A self-reset shock absorbing structure of a prefabricated subway station center column and arc rubber bearing - Google Patents

Abstract

The invention discloses a self-resetting shock-absorbing structure for a prefabricated subway station center column and an arc-shaped rubber bearing, which includes a subway station space composed of a prefabricated top plate, a prefabricated bottom plate, a prefabricated side wall and a prefabricated center column. The joints of the top plate and the prefabricated bottom plate are respectively provided with arc-shaped rubber supports that change the whole structure from "rigid connection" to "hinged". The prestressed steel bar connecting the prefabricated top plate and the prefabricated bottom plate, the two ends of the prefabricated steel bar are anchored with nuts, and the prefabricated center column is an "I"-shaped structure. Structural connection, through the tenon-and-mortise structure, under the action of the earthquake, the bending moment of the center column at the connection position of the station roof and the station floor is released, which reduces the damage to the station; the steel cylinder concrete prefabricated center column greatly improves the center column. The strength of the central column reduces the deformation of the central column and improves the seismic capacity of the central column.

Description

A self-reset shock absorbing structure of a prefabricated subway station center column and arc rubber bearing

technical field

The invention relates to the technical field of shock absorption of subway stations, in particular to a self-reset shock absorption structure of a prefabricated subway station center column and an arc-shaped rubber bearing connecting the prefabricated side walls, prefabricated top plates and prefabricated bottom plates of the subway station.

Background technique

With the rapid development of China's economy and the increasing urban population, urban traffic congestion and environmental problems have gradually become obstacles restricting urban development. The development of underground space resources and the construction of subway are one of the effective ways to solve urban traffic congestion. The subway has the characteristics of fast, efficient and clean, and its advantages are obvious. For subway stations, most of the subway stations are underground and are located in densely populated areas. Once an earthquake strikes, it will bring a huge threat to people's life safety and property. In the Great Hanshin Earthquake in 1995, a large number of subway tunnels and stations were damaged, causing huge economic losses and casualties. Among them, Dakai Subway Station and Shangze Subway Station suffered the most serious damage. More than half of the central columns were damaged in the earthquake. This earthquake has attracted extensive attention from the civil engineering community. Therefore, the strengthening of shock absorption of central columns is one of the key points. However, most of the existing patents for the treatment of the center column simply use the rubber cushion, which lacks innovation. In addition, the joints between the side walls and the top and bottom plates of subway stations are mostly cast-in-place "rigid connection" method, which has poor shock absorption effect. becomes hinged. However, when the existing patent changes "rigid connection" into "hinge connection", the variable displacement of the connection is uncontrollable, which affects the overall stability and later repair of the station. For example, Beijing University of Technology Du Xiuli et al. Station Flexible Seismic Structure" (Patent No. CN106351494A) adopts a flexible system combining prestressed tendons and rubber bearings between the side walls and the top and bottom plates. The seat has no radian, the force transmission is not reliable enough, the rotation is not flexible enough, it is not suitable for the large swing or opening and closing of the structure, and there is room for improvement in the self-resetting ability of the structure.

Invention content:

Technical problem: The purpose of the present invention is to provide a self-resetting shock absorption of a prefabricated subway station center column and an arc rubber bearing with good shock absorption performance and self-resetting ability after an earthquake, aiming at the deficiencies of the prior art structure.

Technical scheme: In order to achieve the above purpose, the self-resetting shock absorption structure of a prefabricated subway station center column and arc rubber bearing of the present invention includes a subway station composed of a prefabricated top plate, a prefabricated bottom plate, a prefabricated side wall and a prefabricated center column. Space, the connection between the prefabricated side wall and the prefabricated top plate and the prefabricated bottom plate are respectively provided with curved rubber bearings that change the whole structure from "rigid connection" to "hinged", so as to increase the overall flexibility of the station; The arc-shaped rubber support at the connection of the prefabricated top plate is arc-shaped upward, and the arc-shaped rubber support at the connection between the pre-fabricated side wall and the pre-fabricated bottom plate is arc-shaped downward; The two sides of the support are connected to the prestressed steel bars of the prefabricated top plate and the prefabricated bottom plate, and the two ends of the prefabricated steel bars are anchored and fixed with nuts. It is connected with the middle part of the prefabricated bottom plate through a tenon and mortise structure. The tenon and mortise structure is provided with a matching rubber cushion, and is provided with a long anchor bolt that passes through the prefabricated central column horizontally. The rubber cushion is provided with a vertical through tenon and tenon. The structure and the rubber cushion bolts at the end of the prefabricated center column are combined with the end of the prefabricated center column through the rubber cushion bolts, and the rubber cushion is used for shock absorption while strengthening the fixation.

The arc-shaped rubber support includes a rubber cushion a, an arc-shaped steel plate a, a middle rubber cushion, an arc-shaped steel plate b, a rubber cushion b and an anchor bolt; the rubber cushion a is located between the arc-shaped steel plate a and the subway station. Between the prefabricated side walls, to reduce the gap between the curved steel plate a and the prefabricated side walls of the subway station, and enhance its bonding; the rubber cushion b is located between the curved steel plate b and the prefabricated bottom plate of the subway station to reduce the amount of the curved steel plate b and the prefabricated bottom plate of the subway station. The gap between the prefabricated bottom plate of the subway station enhances its bonding degree; there is a matching middle rubber cushion between the curved steel plate a and the curved steel plate b; Under the action of pressure, the overall station structure has the ability to reset itself.

The prestressed steel bars passing through both sides of the arc-shaped rubber support and passing through the prefabricated top plate and the prefabricated bottom plate are in two rows, and the number of each row is determined according to specific construction requirements.

The two ends of the prefabricated side wall are arcs that match the arcuate directions of the arcuate rubber supports.

The prefabricated center column is provided with a steel cylinder outside, and the inner wall of the steel cylinder is provided with a number of rivets that can strengthen the connection between the steel cylinder and the concrete, so that the steel cylinder and the concrete are integrated to enhance the strength of the prefabricated center column.

The upper part of the prefabricated side wall is provided with a grouting hole which is inclined upward to the outer side of the upper curved rubber bearing, and the lower part of the prefabricated side wall is provided with a sloping downward injection of waterproof concrete to the outer side of the lower curved rubber bearing. grouting hole.

A displacement monitoring device for monitoring the displacement of the prefabricated side wall and the curved rubber support is provided at the connection between the prefabricated side wall and the prefabricated bottom plate.

Beneficial effects: the present invention adopts the tenon-and-mortise structure to connect the prefabricated central column, the prefabricated top plate and the prefabricated bottom plate. Under the action of the earthquake, the bending moment at the connection position between the central column and the station top plate and the station bottom plate is released, reducing the damage to the station; The steel cylinder concrete prefabricated central column greatly improves the strength of the central column, reduces the deformation of the central column, and improves the seismic capacity of the central column; compared with the prior art, it has the following advantages:

1) The prefabricated central column is hinged with the prefabricated top plate and the prefabricated bottom plate through rubber cushion bolts and long anchor bolts to reduce the rigidity of the connection between the central column and the wall and release the bending moment in time; at the same time, the prefabricated central column is connected with the prefabricated top plate and the prefabricated bottom plate. The rubber cushion layer can effectively consume the seismic wave energy, so that the entire center column has a certain degree of rigidity and flexibility, and is not easy to be broken.

2) Arc-shaped rubber bearings are used to connect the prefabricated side walls, the prefabricated roof and the prefabricated bottom plate. Under the pressure of the overlying soil in the subway station and the action of the prestressed tendons, the prefabricated side walls are fixed between the prefabricated top plate and the prefabricated bottom plate. The lateral displacement of the subway station can be reduced, and the self-reset function of the side wall of the subway station can be realized.

3) The connection between the side wall of the subway station, the station roof and the station floor is changed from "rigid connection" to "hinged" through the curved rubber bearing. At the same time, the curved rubber bearing can consume the seismic wave energy and improve the shock absorption capacity of the subway station.

4) Prefabricated components are used to improve construction efficiency and facilitate maintenance and repair. The prestressed steel bars are connected to the prefabricated side walls, prefabricated top plate and prefabricated bottom plate, combined with the curved rubber bearing, which can limit the lateral displacement of the station and make the whole structure have self-reset function.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

2 is a schematic diagram of the connection between the end of the center column and the top plate of the present invention;

3 is a schematic cross-sectional view of the center column sleeve member of the present invention;

Fig. 4 is the connection schematic diagram of side wall and top plate of the present invention;

5 is a schematic diagram of the connection between the side wall and the bottom plate of the present invention;

FIG. 6 is a schematic diagram of the connection and disassembly of the side wall and the bottom plate of the present invention.

In the picture: 1-prefabricated top plate, 2-prefabricated bottom plate, 3-prefabricated side wall, 4-prefabricated center column, 5-curved rubber bearing, 5-1-rubber cushion b, 5-2-curved steel plate b , 5-3-central rubber cushion, 5-4-curved steel plate a, 5-5-rubber cushion a, 5-6-anchor bolt, 6-mortise and tenon structure, 7-prestressed steel bar, 8-displacement Monitoring device, 9-grouting hole, 10-waterproof concrete, 11-rubber cushion, 12-rubber cushion bolt, 13-long anchor bolt, 14-rivet, 15-steel cylinder.

Detailed ways:

The present invention will be further described below in conjunction with the embodiments in the accompanying drawings:

The self-resetting damping structure of the prefabricated subway station center column and arc rubber bearing of the present invention includes a subway station space composed of a prefabricated top plate 1, a prefabricated bottom plate 2, a prefabricated side wall 3 and a prefabricated center column 4. The prefabricated The connection between the side wall 3 and the prefabricated top plate 1 and the prefabricated bottom plate 2 is respectively provided with an arc-shaped rubber bearing 5 which changes the whole structure from "rigid connection" to "hinged", so as to increase the overall flexibility of the station; the prefabricated side wall 3. The two ends are arc-shaped that match the arc direction of the arc-shaped rubber support 5. The arc-shaped rubber support 5 at the connection between the prefabricated side wall 3 and the prefabricated top plate 1 is arc-shaped upward, and the arc-shaped rubber support 5 at the connection between the pre-fabricated side wall 3 and the pre-fabricated bottom plate 2 is arc-shaped downward; the arc-shaped rubber support 5 includes a rubber cushion layer a5-5, an arc-shaped steel plate a5-4, a middle rubber cushion layer 5-3, an arc-shaped steel plate b5-2, a rubber cushion layer b5-1 and an anchor bolt 5-6; the rubber cushion layer a5 -5 is located between the arc-shaped steel plate a5-4 and the prefabricated side wall 3 of the subway station to reduce the gap between the arc-shaped steel plate a5-4 and the prefabricated side wall 3 of the subway station and enhance its bonding; the rubber cushion b5-1 is located in the arc between the curved steel plate b5-2 and the prefabricated bottom plate 2 of the subway station to reduce the gap between the curved steel plate b5-2 and the prefabricated bottom plate 2 of the subway station, and enhance its bonding degree; between the curved steel plate a5-4 and the curved steel plate b5-2 There is a matching middle rubber cushion 5-3; when the prefabricated side wall 3 is displaced laterally, under the action of the prestressed steel bar 7 and its overlying earth pressure, the overall station structure has the ability to reset itself. The left and right sides of the prefabricated side walls 3 are respectively provided with prestressed steel bars 7 that pass through both sides of the arc-shaped rubber support 5 and are connected to the prefabricated top plate 1 and the prefabricated bottom plate 2. The ends of the prefabricated steel bars 7 are anchored and fixed with nuts. The magnitude of the stress is set according to the actual situation on site; a displacement monitoring device 8 for monitoring the displacement of the prefabricated side wall 3 and the curved rubber support 5 is provided at the connection between the prefabricated side wall 3 and the prefabricated bottom plate 2 . The upper part of the prefabricated side wall 3 is provided with a grouting hole 9 which is inclined upward to the outer side of the upper arc-shaped rubber bearing 5 for pouring waterproof concrete 10; The grouting hole 9 of the waterproof concrete 10 is poured on the outside to prevent the infiltration of groundwater. The prestressed steel bars 7 passing through both sides of the arc-shaped rubber support 5 and passing through the prefabricated top plate 1 and the prefabricated bottom plate 2 are in two rows, and the number of each row is determined according to specific construction requirements. The prefabricated central column 4 is of an "I"-shaped structure, and a steel cylinder 15 is provided outside the prefabricated central column 4. The inner wall of the steel cylinder 15 is provided with a number of rivets 14 that can strengthen the connection between the steel cylinder 15 and the concrete, so that the steel The cylinder 15 and the concrete are integrated to enhance the strength of the prefabricated center column 4 . The two ends of the prefabricated central column 4 are respectively connected with the prefabricated top plate 1 and the middle part of the prefabricated bottom plate 2 through a tenon-and-mortise structure 6. The tenon-and-mortise structure 6 is provided with a rubber cushion 11 that matches with it, and is provided with a transversely passing through the prefabricated middle part. The long anchor bolt 13 of the column 4, the rubber cushion layer 11 is provided with a rubber cushion bolt 12 that vertically passes through the tenon and mortise structure 6 and the end of the prefabricated center column 4, and is combined with the end of the prefabricated center column 4 through the rubber cushion bolt 12 Together, the rubber cushion layer 11 is used for shock absorption while strengthening the fixation.

Because the connection between the prefabricated side wall 3 and the prefabricated top plate 1 and the prefabricated bottom plate 2 is arc-shaped, under the action of earthquake, the wall connection of the subway station is prone to displacement damage. The prefabricated side wall 3 and the prefabricated top plate 1 and the prefabricated bottom plate 2 are self-resetting after the displacement occurs at the connection point; the prestressed steel bars 7 pass through the reinforcement holes on both sides to connect the prefabricated bottom wall 2, the prefabricated side wall 3, the prefabricated top plate 1 and the The prefabricated side walls 3 are connected as a whole.

Because the arc-shaped rubber support 5 is composed of a rubber cushion layer a5-5, an arc-shaped steel plate a5-4, a middle rubber cushion layer 5-3, an arc-shaped steel plate b5-2, and a rubber cushion layer b5-1. The rubber cushion a5-5 is arranged between the arc-shaped steel plate a5-4 and the prefabricated side wall 3, and the middle rubber cushion layer 5-3 is arranged between the arc-shaped steel plate a5-4 and the arc-shaped steel plate b5-2. b5-1 is arranged between the arc-shaped steel plate b5-2 and the prefabricated bottom plate 2. The function of the rubber bearing is to consume the seismic wave energy under the action of the earthquake to reduce the damage of the connection between the side wall and the bottom plate, and the side wall and the top plate due to the earthquake action.

The mortise-and-mortise structure 6 is adopted at the connection between the prefabricated central column 4 and the prefabricated top plate 1 and the prefabricated bottom plate 2, so that the connection between the central column and the station roof and the station floor can be changed from "rigid connection" to "hinged". , the bending moment can be released in time to reduce the damage of the joint; the joints of the prefabricated center column, the prefabricated top plate and the prefabricated bottom plate are all provided with rubber cushions to consume seismic wave energy. The rubber cushion is fixed in the tenon-and-mortise structure by bolts, so that the prefabricated central column is closely combined with the prefabricated top plate and the prefabricated bottom plate to form a stable structure.

The invention utilizes the advantages of prefabricated components to change the connection between the central column, the station roof and the station floor, and the connection between the side wall and the station floor and the station roof, which are easily damaged under the action of earthquakes, from the original "rigid connection" to "Hinged", which can release the bending moment in time to reduce damage; the prestressing of the prestressed steel bars 7 is conducive to the self-resetting of the station structure when the displacement occurs under the action of the earthquake; There are rubber pads to dissipate seismic wave energy.

Detailed ways:

The prefabricated top plate 1, prefabricated bottom plate 2, prefabricated side wall 3, and prefabricated center column 4 are all prefabricated in the factory. The prefabricated side wall 3, prefabricated bottom plate 2, and prefabricated top plate 1 have steel ducts reserved inside, and the rubber cushion a5- 5. The arc-shaped steel plate a5-4 is fixed on the prefabricated side wall 3 by the anchor bolts 5-6.

When installing:

The first step: Anchor one end of the prestressed steel bar 7 on the prefabricated bottom plate 2, and use the lifting equipment to place the prefabricated bottom plate 2 in the designated position;

The second step: place the rubber support on the prefabricated bottom plate 2, and place the prefabricated side wall 3 on the rubber support;

The third step: the rubber bearing is placed on the upper end of the prefabricated side wall 3, followed by the butt hoisting of the prefabricated roof 1 and the prefabricated side wall 3, and the prefabricated roof 1 and the prefabricated side wall 3 are connected by prestressed steel bars 7 and prestressed;

The fourth step: the prefabricated central column 4 is connected with the prefabricated top plate 1 and the prefabricated bottom plate 2 through the tenon-and-mortise structure 6;

The fifth step: inject waterproof concrete 10 through the grouting hole 9 .

Through the mechanical integration construction process, the prefabricated components and other related components of the station will be installed in place, and the structures will be closely connected. The joints with the top plate and the bottom plate, and the joints between the middle column and the top plate and the bottom plate can release the bending moment in time and have a self-reset function.

Claims (1)

1. The utility model provides an assembled subway station center pillar and arc rubber support are from restoring to throne shock-absorbing structure, includes the subway station space that comprises prefabricated roof (1), prefabricated bottom plate (2), prefabricated side wall (3) and prefabricated center pillar (4), its characterized in that: the connection parts of the prefabricated side walls (3), the prefabricated top plate (1) and the prefabricated bottom plate (2) are respectively provided with an arc-shaped rubber support (5) which changes the whole structure from rigid connection to hinged connection so as to increase the overall flexibility of the station; the arc-shaped rubber support (5) at the joint of the prefabricated side wall (3) and the prefabricated top plate (1) is upward in arc shape, and the arc-shaped rubber support (5) at the joint of the prefabricated side wall (3) and the prefabricated bottom plate (2) is downward in arc shape; the left side and the right side of the prefabricated side wall (3) are respectively provided with prestressed reinforcements (7) which penetrate through two sides of an arc-shaped rubber support (5) and are communicated with a prefabricated top plate (1) and a prefabricated bottom plate (2), two ends of each prestressed reinforcement (7) are fixed by nuts in an anchoring manner, each prefabricated center pillar (4) is of an I-shaped structure, two ends of each prefabricated center pillar (4) are respectively connected with the middle parts of the prefabricated top plate (1) and the prefabricated bottom plate (2) through tenon-and-mortise structures (6), each tenon-and-mortise structure (6) is provided with a rubber cushion layer (11) matched with the tenon-and-mortise structure, each tenon-and-mortise structure is provided with a long anchoring bolt (13) which transversely penetrates through the prefabricated center pillar (4), each rubber cushion layer (11) is provided with a rubber cushion bolt (12) which perpendicularly penetrates through the end parts of the tenon-and mortise structures (6) and the, the rubber cushion layer (11) is utilized to absorb shock while strengthening and fixing;

the arc-shaped rubber support (5) comprises a rubber cushion layer a (5-5), an arc-shaped steel plate a (5-4), a middle rubber cushion layer (5-3), an arc-shaped steel plate b (5-2), a rubber cushion layer b (5-1) and an anchoring bolt (5-6); the rubber cushion layer a (5-5) is positioned between the arc-shaped steel plate a (5-4) and the prefabricated side wall (3) of the subway station, so that the gap between the arc-shaped steel plate a (5-4) and the prefabricated side wall (3) of the subway station is reduced, and the combination degree of the arc-shaped steel plate a (5-4) and the prefabricated side wall (3) of the subway station is enhanced; the rubber cushion layer b (5-1) is positioned between the arc-shaped steel plate b (5-2) and the subway station prefabricated bottom plate (2) so as to reduce the gap between the arc-shaped steel plate b (5-2) and the subway station prefabricated bottom plate (2) and enhance the combination degree of the arc-shaped steel plate b (5-2) and the subway station prefabricated bottom plate; a middle rubber cushion layer (5-3) is arranged between the arc-shaped steel plate a (5-4) and the arc-shaped steel plate b (5-2); when the prefabricated side wall (3) is displaced transversely, the whole station structure has the self-resetting capability under the action of the prestressed reinforcement (7) and the overlying soil pressure;

the prestressed reinforcements (7) which penetrate through two sides of the arc-shaped rubber support (5) and are communicated with the prefabricated top plate (1) and the prefabricated bottom plate (2) are arranged in two rows;

the two end parts of the prefabricated side wall (3) are arc-shaped and are matched with the arc-shaped rubber support (5) in the arc direction;

a steel cylinder (15) is arranged outside the prefabricated center pillar (4), and a plurality of rivets (14) capable of enhancing the connection between the steel cylinder (15) and concrete are arranged on the inner wall of the steel cylinder (15), so that the steel cylinder (15) and the concrete form a whole, and the strength of the prefabricated center pillar (4) is enhanced;

the upper part of the prefabricated side wall (3) is provided with an inclined upward grouting hole (9) for injecting waterproof concrete (10) to the inner side of the upper arc-shaped rubber support (5), and the lower part of the prefabricated side wall (3) is provided with an inclined downward grouting hole (9) for injecting waterproof concrete (10) to the inner side of the lower arc-shaped rubber support (5);

and a displacement monitoring device (8) for monitoring the displacement of the prefabricated side wall (3) and the arc-shaped rubber support (5) is arranged at the joint of the prefabricated side wall (3) and the prefabricated bottom plate (2).

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