CN113482037A - Subway station damping beam column node with high durability and construction method thereof - Google Patents
Subway station damping beam column node with high durability and construction method thereof Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/04—Making large underground spaces, e.g. for underground plants, e.g. stations of underground railways; Construction or layout thereof
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- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
- E04B1/21—Connections specially adapted therefor
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- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
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- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
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- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
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Abstract
The invention discloses a subway station damping beam column node with high durability and a construction method thereof, wherein the damping beam column node is arranged between the column end of a middle column of a subway station and a corresponding top longitudinal beam and between corresponding middle longitudinal beams; the shock absorption beam column node comprises an elastic support connecting system and an elastic support which are matched with each other, and a protection structure. During construction, pre-reserving and embedding the corresponding damping beam column nodes on the middle longitudinal beam; after the bottom plate, the middle columns and the side walls of the lower two layers, the middle plate and the middle longitudinal beams are built, the elastic support is pre-connected with the damping beam-column nodes between the middle longitudinal beams and the corresponding middle columns; then, pre-burying of the corresponding damping beam column nodes on the top longitudinal beam is completed; and after the middle columns and the side walls, the top plate and the top longitudinal beam of the next layer are built back, the elastic support is pre-connected, and the damping beam-column joints between the top longitudinal beams and the corresponding middle columns are completed. The invention can ensure the effective transmission of load and the stability of beam-column joints and solve the problem of durability of the flexible support or the damping support.
Description
Technical Field
The invention relates to the technical field of subway earthquake resistance, in particular to a high-durability subway station damping beam column node and a construction method thereof.
Background
For a long time, people generally think that subway stations are less damaged by earthquake action because the subway stations are buried in the soil. However, the existing earthquake damage shows that: when a strong earthquake disaster occurs, the existing subway station structure is unsafe. For example, the earthquake of Ms7.2 grade of Osaka Japan in 1995 causes the most serious damage to subways, underground businesses and tunnels in Shenhu city from history. Among them, the most noticeable is the destruction of 5 subway stations. The large open station is used as a subway station with the most serious damage, more than 50 percent of center pillars completely collapse, the top plate is broken and damaged directly, the overlying soil layer collapses, the maximum settlement amount reaches as much as 2.5m, the subway stops running, and the ground traffic is paralyzed.
The 'sakashen earthquake' disaster reveals a failure mechanism that the breakage of the center pillar of the iron car station under the earthquake disaster causes the breakage of the top plate and further causes the collapse of the whole underground structure. This is mainly because: for the box structure type of the subway underground station, the center column is of a discrete structure and is not restrained around, the shear-resistant deformation capacity of the center column relative to the side wall is obviously weaker than that of the side wall, and the conventional subway station design in which the center column and the beam slab are fixedly connected in an integrally-poured mode causes that a large bending moment and a large shear force which are not matched with the shear-resistant deformation capacity are borne under the action of an earthquake, so that shear-pressure damage occurs, the top plate is bent and broken, and the structure is seriously damaged. Therefore, how to protect the center pillar from losing the vertical bearing capacity due to excessive deformation under the action of earthquake becomes the key for solving the problem.
In the traditional method, a center column adopts a steel reinforced concrete combined member. Although the bearing capacity of the center pillar can be increased, when an earthquake occurs, the outer covering concrete layer is easy to peel off under the condition of large horizontal deformation, and the whole combined member continuously bears larger bending moment and shearing force because the section steel member goes deep into the beam slab structure and the fixed connection form of the node is not changed, and the shearing resistance is greatly reduced and the combined member is easier to damage because the constraint of the concrete layer is lost. Inspired by the fabricated structure, some scholars improve the defect of poor deformability of the center pillar at the joint by adjusting the traditional "rigid joint" of the center pillar with the top and middle panels to a "flexible joint". The common forms of connection of rubber supports, connection of rigid spherical hinges, connection of friction sliding devices, connection of pressure-bearing steel balls and shock absorption layers, bolting of prestressed tendons and shear pins and the like are available, but the existing flexible connection modes adopt complex mechanisms formed by elastic materials such as rubber or metal material parts, and cannot meet the requirements of design service life of 100 years and corresponding high durability in the dry-wet alternative environment of underground subway stations.
Therefore, how to significantly improve the shear deformation resistance of the reinforced concrete center pillar under the action of strong earthquake and effectively solve the problem of high durability is a troublesome problem to be solved urgently in the industry at present.
Disclosure of Invention
In view of the defects in the prior art, the invention provides a subway station damping beam column node with high durability and a construction method thereof, and aims to ensure effective load transmission and stability of the beam column node and solve the problem of durability caused by the fact that the conventional complex damping support composed of elastic material flexible supports such as rubber or metal material parts does not consider the dry-wet alternative environment of the subway station underground.
In order to achieve the purpose, the invention discloses a subway station damping beam-column node with high durability, which is arranged between the column end of each center column of a subway station and a corresponding top longitudinal beam and between corresponding middle longitudinal beams;
each damping beam column node comprises an elastic support connecting system, an elastic support and a protection structure which are matched with each other;
each elastic support connecting system comprises a steel bar connector, an embedded steel plate, an embedded column anchor bar and an embedded anchor bolt which are arranged at the end of the corresponding middle column, and the steel bar connector, the embedded steel plate, the embedded beam anchor bar and the embedded anchor bolt which are arranged at the bottom of the corresponding top longitudinal beam or the corresponding middle longitudinal beam;
each protection structure comprises a plurality of center pillar steel bars and an enclosure, wherein the center pillar steel bars are connected with the steel bar nets in the center pillars and the top longitudinal beams through the steel bar connectors, and the enclosure is formed outside the center pillar steel bars by adopting light porous concrete.
Preferably, the end of each embedded beam anchor bar is hung on the middle plate lower layer steel bar of the corresponding middle plate or the top plate lower layer steel bar of the corresponding top plate in a hook mode.
The invention also provides a construction method for the subway station damping beam column node with high durability, which comprises the following steps:
building the bottom plate, the middle columns and the side walls of the lower two layers;
a central column steel bar is reserved at the top of each central column of the lower two layers, and the corresponding steel bar connector, the embedded steel plate, the embedded column anchor bar and the embedded anchor bolt are arranged;
building a middle plate and the middle longitudinal beam;
the bottom of the middle longitudinal beam is provided with the steel bar connector, the embedded steel plate, the embedded beam anchor bar and the embedded anchor bolt which correspond to the top of the middle column of the lower second layer;
step 2, completing the pre-connection of each elastic support; fastening the connecting steel plate of each elastic support with the corresponding reserved bolt hole of the corresponding embedded anchor bolt through a rear nut;
after the concrete of the middle columns of the lower two layers and the corresponding middle longitudinal beams reach the designed strength, screwing each corresponding rear-mounted nut, connecting the middle column reinforcing steel bars in the shock absorption beam-column joints through the corresponding reinforcing steel bar connectors, and encapsulating by adopting light porous concrete;
building the middle column and the side wall of the next layer;
reserving the middle column steel bars at the top of the middle column of the next layer, and arranging the corresponding steel bar connectors, the embedded steel plates, the embedded column anchor bars and the embedded anchor bolts;
building a top plate and the top longitudinal beam;
the bottom of the top longitudinal beam is provided with the steel bar connector, the embedded steel plate, the embedded beam anchor bar and the embedded anchor bolt which correspond to the top of the middle column of the next layer;
and after the concrete of the middle column of the next layer and the corresponding middle longitudinal beam reaches the designed strength, screwing each corresponding rear-mounted nut, connecting the middle column reinforcing steel bars in the damping beam column node through the corresponding reinforcing steel bar connectors, and encapsulating by adopting light porous concrete.
Preferably, after the strong shock action, resetting each deformed elastic support comprises the following specific steps:
firstly, cleaning all residues of the lightweight porous concrete caused by earthquake and all the center pillar reinforcing steel bars deformed by earthquake, and replacing each penetrating center pillar reinforcing steel bar by combining the reinforcing steel bar connector at the top of each center pillar;
and then, encapsulating each elastic support by adopting light porous concrete again to restore the structure.
The invention has the beneficial effects that:
the application of the invention not only ensures the effective transmission of normal use working condition load and the stability of beam column nodes, but also solves the problem that the existing complex damping support composed of elastic material flexible supports such as rubber and the like or metal material parts does not consider the requirement of high durability corresponding to the design service life of 100 years under the dry-wet alternative environment of the subway underground station.
The invention can not only improve the shearing deformation resistance of the center pillar and avoid the shearing damage of the center pillar, but also solve the problem of the large deformation damage of the support without limit under the action of strong shock under the working condition of strong shock.
The invention has simple structure, realizes the quick installation in site construction and improves the production efficiency by factory prefabrication and component assembly.
The method combines the pre-buried measures of reservation, realizes the node updating after the strong earthquake disaster, and is environment-friendly, energy-saving and emission-reducing.
The application of the patent effectively expands the construction means of underground engineering to the energy dissipation and shock absorption center pillar of the subway station, promotes the technical progress of the industry, and has better economic benefit and social benefit.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
Fig. 1 is a schematic cross-sectional view of a station according to an embodiment of the present invention.
Fig. 2 is a partially enlarged structural view of the middle longitudinal beam and the pillar according to an embodiment of the invention.
Fig. 3 is a schematic structural diagram of an embedded steel plate according to an embodiment of the present invention.
Fig. 4 is a schematic cross-sectional view illustrating a node of a shock-absorbing beam column according to an embodiment of the present invention.
Fig. 5 is a partially enlarged structural view of the middle of the top longitudinal beam and the pillar according to an embodiment of the invention.
Detailed Description
Examples
As shown in fig. 1 to 5, considering high durability of the damping beam-column node of the subway station, the damping beam-column node 4 is arranged between a column end of each center column 3 and a corresponding top longitudinal beam 9, and between corresponding middle longitudinal beams 6 of the subway station;
each damping beam column node 4 comprises an elastic support connecting system and an elastic support 15 which are matched with each other, and a protection structure;
each elastic support connecting system comprises a steel bar connector 23, an embedded steel plate 12, an embedded column anchor bar 14 and an embedded anchor bolt 18 which are arranged at the column end of the corresponding middle column 3, and a steel bar connector 23, an embedded steel plate 12, an embedded beam anchor bar 13 and an embedded anchor bolt 18 which are arranged at the bottom of the corresponding top longitudinal beam 9 or the corresponding middle longitudinal beam 6;
each protective structure comprises a plurality of center pillar steel bars 11 connecting the center pillar 3 and the steel mesh in the top longitudinal beam 9 through steel bar connectors 23, and an enclosure formed outside the plurality of center pillar steel bars 11 by lightweight porous concrete 16.
In the normal use working condition of the invention, the vertical load of the station structure is enveloped and born by the penetrating central column steel bar and the light porous concrete, thereby ensuring the effective transmission of the load and the stability of the beam column node; the lightweight porous concrete is relatively independent, seals micro-bubbles and has good integrity, and meets the requirement of high durability corresponding to the design service life of the penetrated center pillar steel bar and the elastic support in a dry-wet alternative environment for 100 years.
Under the working condition of strong shock action, the lightweight porous concrete is lower in strength than the longitudinal beam and the center pillar concrete and low in elastic brittleness, and is cracked and damaged firstly under the trend of large shear deformation, the internal elastic support 15 releases the bending moment and the shear force of the pillar end, and the corresponding horizontal load is transferred to the side wall through deformation coordination. The shear deformation resistance of the side wall has larger safety margin due to the constraint of the soil body and the supporting action of the top plate and the bottom plate, so that the change of the stress characteristic can not cause too large influence on the side wall, thereby achieving the purposes of energy dissipation and shock absorption, avoiding the shear compression damage of the center pillar and the large-scale collapse of the structure. Meanwhile, the penetrating center pillar steel bar 11 limits the horizontal deformation of the elastic support 15.
The center pillar reinforcing bars 11 and the enclosure formed by the lightweight porous concrete 16 outside the plurality of center pillar reinforcing bars 11 can give consideration to vertical bearing and ensure durability in the use stage, and the elastic support 15 plays a role after the early rupture in the earthquake stage.
After the strong earthquake disaster, the elastic support is deformed and reset, clean lightweight porous concrete residues and deformed penetrating center pillar steel bars are removed, the penetrating center pillar steel bars are replaced by combining construction measures such as a center pillar steel bar connector embedded in the column cap, and the elastic support is encapsulated by the lightweight porous concrete again to restore the structure.
In practical application, the thickness and size of the embedded steel plates 12, the arrangement, number a, diameter and length of the beam embedded beam anchor bars 13, the embedded column anchor bars 14 and the embedded anchor bolts 18 are determined according to calculation, and the distance c in arrangement is the prior art, so that the design requirements of the existing concrete structure are met.
In some embodiments, the end of each embedded beam anchor 13 is hooked on the middle-plate lower-layer steel bar 10 of the corresponding middle plate 5 or the top-plate lower-layer steel bar 22 of the corresponding top plate 8.
The invention also provides a construction method for the subway station damping beam column node with high durability, which comprises the following steps:
as shown in fig. 2 to 4, step 1, completing the pre-burying of the corresponding shock-absorbing beam-column joint 4 at each middle longitudinal beam 6;
building the bottom plate 1, the middle columns 3 and the side walls of the lower two layers;
a central column steel bar 11 is reserved at the top of each central column 3 of the lower two layers, and a corresponding steel bar connector 23, an embedded steel plate 12, a pre-embedded column anchor bar 14 and an embedded anchor bolt 18 are arranged;
building the middle plate 5 and the middle longitudinal beam 6;
a steel bar connector 23, an embedded steel plate 12, an embedded beam anchor bar 13 and an embedded anchor bolt 18 which correspond to the top of the middle column 3 of the lower second layer are reserved at the bottom of the middle longitudinal beam 6;
as shown in fig. 4, step 2, completing the pre-connection of each elastic support 15; fastening the connecting steel plate 17 of each elastic support 15 and the corresponding reserved bolt hole of the corresponding embedded anchor bolt 18 through a rear-mounted nut 19;
after the concrete of the middle columns 3 and the corresponding middle longitudinal beams 6 of the lower two layers reaches the design strength, screwing down each corresponding rear-mounted nut 19, connecting the middle column steel bars 11 in the shock absorption beam-column joints 4 through corresponding steel bar connectors 23, and encapsulating by adopting light porous concrete 16;
as shown in fig. 5, step 4, completing the pre-embedding of the corresponding damping beam-column joint 4 on each top longitudinal beam 9;
building the middle column 3 and the side wall of the next layer;
a middle column steel bar 11 is reserved at the top of the middle column 3 of the next layer, and a corresponding steel bar connector 23, an embedded steel plate 12, a pre-embedded column anchor bar 14 and an embedded anchor bolt 18 are arranged;
building a top plate 8 and a top longitudinal beam 9;
a reinforcing steel bar connector 23, an embedded steel plate 12, an embedded beam anchor bar 13 and an embedded anchor bolt 18 which correspond to the top of the middle column 3 of the next layer are reserved at the bottom of the top longitudinal beam 9;
after the concrete of the middle column 3 and the corresponding middle longitudinal beam 6 of the next layer reaches the designed strength, each corresponding rear nut 19 is screwed down, the middle column steel bars 11 in the shock absorption beam-column node 4 are connected through corresponding steel bar connectors 23, and the light porous concrete 16 is used for encapsulation.
In one embodiment, after a strong shock occurs, each deformed elastic support 15 is reset, and the specific steps are as follows:
firstly, removing all residues of the lightweight porous concrete 16 generated by earthquake and all the center pillar steel bars 11 deformed by earthquake, and replacing each penetrating center pillar steel bar 11 by combining the steel bar connector 23 at the top of each center pillar 3;
then, each elastic support 15 is encapsulated again by lightweight porous concrete 16, and the structure is restored.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (4)
1. The subway station damping beam column node with high durability is characterized in that the damping beam column node (4) is arranged between the column end of each center column (3) of the subway station and the corresponding top longitudinal beam (9) and between the corresponding middle longitudinal beams (6);
each damping beam column node (4) comprises an elastic support connecting system and an elastic support (15) which are matched with each other, and a protection structure;
each elastic support connecting system comprises a steel bar connector (23), an embedded steel plate (12), an embedded column anchor bar (14) and an embedded anchor bolt (18) which are arranged at the column end of the corresponding center column (3), and the steel bar connector (23), the embedded steel plate (12), the embedded beam anchor bar (13) and the embedded anchor bolt (18) which are arranged at the bottom of the corresponding top longitudinal beam (9) or the corresponding middle longitudinal beam (6);
each protective structure comprises a plurality of center pillar steel bars (11) which are connected with the steel bar nets in the center pillars (3) and the top longitudinal beams (9) through the steel bar connectors (23), and an enclosure which is formed outside the center pillar steel bars (11) by adopting light porous concrete (16).
2. The subway station damping beam column node with high durability as claimed in claim 1, wherein the end of each embedded beam anchor bar (13) is hung on the middle plate lower layer steel bar (10) of the corresponding middle plate (5) or the top plate lower layer steel bar (22) of the corresponding top plate (8) in a hook manner.
3. The construction method considering both the high durability subway station damping beam column node as claimed in claim 1, comprises the following steps:
step 1, completing the pre-embedding of each middle longitudinal beam (6) corresponding to the damping beam column node (4);
the bottom plate (1), the middle columns (3) of the lower two layers and the side walls are built back;
a central column reinforcing steel bar (11) is reserved at the top of each central column (3) of the lower two layers, and the corresponding reinforcing steel bar connector (23), the embedded steel plate (12), the embedded column anchor bar (14) and the embedded anchor bolt (18) are arranged;
building a middle plate (5) and the middle longitudinal beam (6) in a recycling way;
the bottom of the middle longitudinal beam (6) is provided with the steel bar connector (23), the embedded steel plate (12), the embedded beam anchor bar (13) and the embedded anchor bolt (18) which correspond to the top of the middle column (3) of the lower second layer;
step 2, completing the pre-connection of each elastic support (15); fastening the connecting steel plate (17) of each elastic support (15) and a corresponding reserved bolt hole of a corresponding embedded anchor bolt (18) through a rear-mounted nut (19);
step 3, completing the damping beam-column node (4) between each middle longitudinal beam (6) and the corresponding middle column (3);
after the concrete of the middle columns (3) and the corresponding middle longitudinal beams (6) of the next two layers reaches the designed strength, screwing down each corresponding rear-mounted nut (19), connecting the middle column reinforcing steel bars (11) in the shock-absorbing beam-column joints (4) through corresponding reinforcing steel bar connectors (23), and encapsulating by adopting light porous concrete (16);
step 4, completing the pre-embedding of each top longitudinal beam (9) corresponding to the damping beam column node (4);
building the middle columns (3) and the side walls of the next layer;
the top of the middle column (3) of the next layer is provided with the middle column reinforcing steel bar (11), and the corresponding reinforcing steel bar connector (23), the embedded steel plate (12), the embedded column anchor bar (14) and the embedded anchor bolt (18) are arranged;
building a top plate (8) and the top longitudinal beam (9) in a return mode;
the bottom of the top longitudinal beam (9) is provided with the steel bar connector (23), the embedded steel plate (12), the embedded beam anchor bar (13) and the embedded anchor bolt (18) which correspond to the top of the middle column (3) of the next layer;
step 5, completing the pre-connection of each elastic support (15); fastening the connecting steel plate (17) of each elastic support (15) and a corresponding reserved bolt hole of a corresponding embedded anchor bolt (18) through a rear-mounted nut (19);
step 6, completing the damping beam-column node (4) between each top longitudinal beam (9) and the corresponding center column (3);
and after the concrete of the middle column (3) and the corresponding middle longitudinal beam (6) of the next layer reaches the designed strength, screwing each corresponding rear-mounted nut (19), connecting the middle column reinforcing steel bars (11) in the damping beam column node (4) through corresponding reinforcing steel bar connectors (23), and encapsulating by adopting light porous concrete (16).
4. The construction method considering both the high durability and the shock absorption beam column node of the subway station as claimed in claim 3, wherein after the strong shock action, each deformed elastic support (15) is reset, and the concrete steps are as follows:
firstly, cleaning all residues of the lightweight porous concrete (16) caused by earthquake and all the center pillar reinforcing steel bars (11) deformed by earthquake, and combining the reinforcing steel bar connectors (23) at the top of each center pillar (3) to replace each penetrating center pillar reinforcing steel bar (11);
then, each elastic support (15) is encapsulated by lightweight porous concrete (16) again, and the structure is restored.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114541187A (en) * | 2022-04-14 | 2022-05-27 | 中国科学院地理科学与资源研究所 | Shock absorption and vibration isolation continuous barrier considering subway station and construction method thereof |
Citations (5)
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