CN108978714B - Be used for prefabricated fissure of displacement of underground structure to assemble segment components of a whole that can function independently post - Google Patents
Be used for prefabricated fissure of displacement of underground structure to assemble segment components of a whole that can function independently post Download PDFInfo
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- CN108978714B CN108978714B CN201811006042.0A CN201811006042A CN108978714B CN 108978714 B CN108978714 B CN 108978714B CN 201811006042 A CN201811006042 A CN 201811006042A CN 108978714 B CN108978714 B CN 108978714B
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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
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
Abstract
The invention discloses a prefabricated staggered-joint assembled segmental split column for an underground structure. The split column consists of a long-segment prefabricated reinforced concrete column, a short-segment prefabricated reinforced concrete column, a column end rubber cushion layer, an inter-column rubber cushion layer and prestressed steel strands. The long-section prefabricated reinforced concrete columns are sequentially stacked in the height direction, one short-section prefabricated reinforced concrete column is placed at one end of each long-section prefabricated reinforced concrete column to form a split column unit, the four split column units are combined into an integral column in a two-row and two-column mode, and the section prefabricated reinforced concrete columns in the split column units are separated from one another through rubber cushion layers. Under the action of earthquake, the prefabricated reinforced concrete columns of all the sections are freely opened and closed at the rubber cushion layer, transverse joints and vertical joints of the prefabricated staggered joint assembled section split columns increase the horizontal deformation capacity of the middle column to a certain extent, and the mutual staggering of the transverse joints is favorable for the horizontal shear capacity of the member. The invention is arranged at the key part of the underground structure, and lightens the damage of the underground structure under the action of earthquake.
Description
Technical Field
The invention relates to the field of construction of underground structural engineering, in particular to a prefabricated staggered-joint assembled segmental split column for an underground structure, and belongs to the technical field of prefabricated subway station earthquake resistance.
Background
In recent years, with the progress of urbanization in various countries around the world, researchers at home and abroad are gradually aware that the development and utilization of underground space become an important development direction. Underground structures are increasingly widely applied to various fields such as urban construction, transportation, national defense engineering, hydraulic engineering and the like, such as railway tunnels, subway engineering, underground markets, air defense engineering and the like. Practice shows that the 21 st century is a century for underground space development and utilization, and the development of underground spaces and the construction of underground structures have entered the peak of rapid development worldwide.
For the urban traffic field, a large-traffic-volume rapid public transport system taking subway engineering as a backbone plays an indispensable role in solving the urban traffic transportation problem. Although underground works are increasingly vigorous, underground works also face the challenge of earthquake. Particularly, in 7.2-level osaka-spirit earthquake of japan in 1995, the underground structure in the mysterious city is seriously damaged from history, and a large number of underground projects such as subways, underground parking lots, underground tunnels, underground commercial streets and the like are seriously damaged. The most remarkable is the destruction of subway stations, wherein the destruction of 5 subway stations and about 3km subway section tunnels in an earthquake occurs, wherein the destruction of the subway stations which are opened up is the most serious, more than half of the center pillars completely collapse, the collapse of the top plate and the settlement of the overlying soil layer are caused, and the maximum settlement amount reaches as much as 2.5 m. The related research shows that the vertical earthquake motion is a key factor possibly causing the damage of the underground structure, particularly, for the shallow underground structure, the overlying soil body is likely to generate shearing damage at the initial stage of the earthquake action, at the moment, the overlying soil body and other soil bodies around the underground structure are not a continuous whole, in the subsequent earthquake reaction, the action of the overlying soil body is only the effect of accumulated soil (similar to the situation of backfill soil body) which is accumulated on the top plate of the underground structure and is in weak connection with the surrounding soil bodies, and the constraint action and the earthquake reaction influence on the underground structure are completely different from the corresponding situation of the continuous soil bodies. The vertical inertia force action of the overlying soil body has great influence on the vertical stress evaluation of the key supporting member of the underground structure, and the axial pressure ratio of the supporting column is actually changed, so that the shearing strength and the deformation performance of the supporting column are changed. For earthquake reaction stress of the underground structure, the fact that the shear strength of the supporting columns is improved and the limit deformability is reduced is unfavorable, means that the supporting columns share more horizontal shear force acting on the underground structure due to soil layer deformation, and meanwhile, the reduction of the limit deformability enables the supporting columns to be damaged before the side walls, and further the integral damage of the top plate and the underground structure system is caused.
The invention provides a prefabricated staggered joint assembled segmental split column for an underground structure based on the earthquake damage characteristics of the underground structure and the damage mechanism of the underground structure, which is used for replacing a common cast-in-place reinforced concrete column in the traditional underground structure. Under the normal use state, the prestressed steel bundles integrally connect the segment reinforced concrete columns in series and are anchored in the top and bottom beams, so that the normal use function of the column is ensured. The underground structure is easy to shear and break under the action of earthquake, and under the action of self weight and additional vertical inertia force, the underground structure needs to bear larger vertical load. The prefabricated staggered joint assembled segmental column is adopted to replace the traditional cast-in-place integral reinforced concrete column, and the defect that the horizontal deformation capacity of the traditional reinforced concrete column is insufficient under the action of high axial pressure is overcome. Each section column is freely opened and closed at the rubber cushion layer, the transverse seams and the vertical seams of the prefabricated staggered joint assembled section split columns increase the deformation capacity of the middle column to a certain extent, and the mutual staggering of the transverse seams is favorable for the shearing resistance of the member.
Disclosure of Invention
The invention discloses a prefabricated staggered-joint assembled segmental split column for an underground structure, which can provide larger vertical compression resistance and horizontal shear resistance under the action of an earthquake, and simultaneously improve the lateral deformation capacity of the split column under the action of high axial pressure, thereby lightening the earthquake disaster of the underground structure.
In order to solve the technical problems, the invention provides a prefabricated staggered-joint assembled segmental split column for an underground structure, which consists of a long segmental prefabricated reinforced concrete column, a short segmental prefabricated reinforced concrete column, a column end rubber cushion layer, an inter-column rubber cushion layer and prestressed steel strands; the long-section prefabricated reinforced concrete columns are sequentially stacked along the height direction, and one short-section prefabricated reinforced concrete column is placed at one end of each long-section prefabricated reinforced concrete column to form a split column unit; the four split column units are combined into a whole in a mode of two rows and two columns, and gaps are reserved among the split column units; the column end rubber cushion layers are arranged at two end parts of the split column units and are respectively connected with the top bottom beam; the rubber cushion layers between the columns are arranged in the middle of the split column units and separate the prefabricated reinforced concrete columns of all the sections, and transverse gaps between the prefabricated reinforced concrete columns of the sections in two adjacent split column units are staggered; the long-section prefabricated reinforced concrete column, the short-section prefabricated reinforced concrete column, the column end rubber cushion layer and the inter-column rubber cushion layer in the split column unit are integrally connected in series through the prestressed steel strands and are anchored in the top-bottom beam.
Furthermore, the long-section prefabricated reinforced concrete column and the short-section prefabricated reinforced concrete column are square-section prefabricated reinforced concrete columns with the same section, vertical through round holes are reserved in the middle of the long-section prefabricated reinforced concrete columns, are prefabricated in a reinforced concrete member processing factory according to corresponding sizes, and are transported to the site for assembly.
Further, the column end rubber cushion layer is made of a cross-section rubber partition and a square-section rubber partition. The cross-section rubber partitions are used for separating the four split column units, and the square-section rubber partitions are used for separating the split column units and the top bottom beam.
Further, the rubber cushion layer between the columns is made of three rubber partitions with square cross sections. The horizontal rubber barrier is used for separating the long-section prefabricated reinforced concrete column and the long-section prefabricated reinforced concrete column which are adjacent to each other on the bottom surface in the same split column unit, or the adjacent long-section prefabricated reinforced concrete column and the short-and-long-section prefabricated reinforced concrete column; the vertical rubber partitions are used for partitioning long-section prefabricated reinforced concrete columns and long-section prefabricated reinforced concrete columns which are adjacent to the side surfaces in the adjacent split column units, or long-section prefabricated reinforced concrete columns and short-and-long-section prefabricated reinforced concrete columns which are adjacent to the side surfaces.
Furthermore, the prestressed steel strands are anchored in the top and bottom beams in a crossed manner, the prestressed steel strands connected with the left split column units in series are anchored on the right sides of the top and bottom beams, and the prestressed steel strands connected with the right split column units in series are anchored on the left sides of the top and bottom beams.
The working mechanism of the invention is as follows: the prefabricated staggered joint assembling segment split column for the underground structure is connected in series through the prestressed steel strands and anchored in the top bottom beam, and can replace a common cast-in-place reinforced concrete column. Under the normal use state, because the prestressing force that exists among the prestressing steel strand wires, the segmentation split column forms reliable whole to guarantee the normal use of split column. When the earthquake was used, 4 components of a whole that can function independently post units are separated into with the whole post to the vertical rubber bed course in the segmentation components of a whole that can function independently post, and the horizontal rubber bed course in the segmentation components of a whole that can function independently post unit separates the segmentation reinforced concrete post in each components of a whole that can function independently post unit simultaneously, and these two kinds of rubber bed courses have all increased the horizontal deformability of components of a whole that can function independently post to a certain extent. The underground structure adopts prefabricated fissure of displacement to assemble segmental split column and can bear vertical load and horizontal load similar with cast-in-place whole reinforced concrete column of tradition, and rubber cushion can provide great lateral deformation ability for prefabricated segmental split column under the high axial compression effect simultaneously to guaranteed the security performance of underground structure key component center pillar in the earthquake, alleviateed the destruction that underground structure probably appears in the earthquake greatly.
The invention has the advantages that: the prefabricated segmental reinforced concrete columns are integrally connected in series and anchored in the top and bottom beams of the structure through the prestressed steel strands, and the working performance of the segmental split columns in a normal use state is guaranteed. The lateral deformation capacity of the split column can be improved by the aid of the horizontal rubber cushion layer and the vertical rubber cushion layer in the segment split column under the action of an earthquake, and meanwhile, the horizontal seams of adjacent split column units are staggered with each other, so that the integral shearing resistance of the member is facilitated. The prefabricated staggered joint assembling segment split column of the underground structure has higher lateral deformation capacity while bearing larger vertical and horizontal loads, thereby ensuring the safety performance of the key component center column of the underground structure in the earthquake and greatly reducing the possible damage of the underground structure in the earthquake. The invention has clear concept, clear principle and easy production, and can be popularized and applied in underground structural engineering.
Drawings
FIG. 1 is a front view of a prefabricated stagger spliced segmented column.
FIG. 2 is a side view of a prefabricated stagger spliced segmented column.
Fig. 3 is a three-dimensional view of a long-section precast reinforced concrete column.
Fig. 4 is a three-dimensional view of a short-segment precast reinforced concrete column.
Fig. 5 is a cross-sectional view of a segment prefabricated reinforced concrete column.
Fig. 6 is a three-dimensional view of a column end rubber cushion layer.
Fig. 7 is a three-dimensional view of the inter-column rubber pad layer.
Fig. 8 is a three-dimensional view of a prefabricated reinforced concrete column with short sections at the end parts of the split column units.
Fig. 9 is a three-dimensional view of a prefabricated reinforced concrete column of a long section at the end of a split column unit.
Fig. 10 is a three-dimensional view of a prefabricated reinforced concrete column of a middle long section of a split column unit.
FIG. 11 is a three-dimensional view of a segmental split column stagger installation.
Fig. 12 is a three-dimensional view of the split post unit installation.
FIG. 13 is an application of prefabricated stagger spliced segmental columns in underground structures.
In the figure: 1. long-segment precast reinforced concrete column, 2, short-segment precast reinforced concrete column, 3, column end rubber cushion, 4, rubber cushion between columns, 5, prestressing force steel strand.
Detailed Description
As shown in fig. 1-13, a prefabricated staggered-joint spliced segmental split column for an underground structure, which consists of a long-segmental prefabricated reinforced concrete column (1), a short-segmental prefabricated reinforced concrete column (2), a column-end rubber cushion layer (3), an inter-column rubber cushion layer (4) and prestressed steel strands (5); the long-section prefabricated reinforced concrete columns (1) are sequentially stacked along the height direction, and one short-section prefabricated reinforced concrete column (2) is placed on one section of the long-section prefabricated reinforced concrete column to form a split column unit; the four split column units are combined into a whole in a mode of two rows and two columns, and gaps are reserved among the split column units; the column end rubber cushion layers (3) are arranged at two end parts of the split column unit and are respectively connected with the top bottom beam; the inter-column rubber cushion layer (4) is arranged in the middle of the split column units, each long-section prefabricated reinforced concrete column (1) is separated from each short-section prefabricated reinforced concrete column (2), and gaps between the section prefabricated reinforced concrete columns in the two adjacent split column units are staggered; the long-section prefabricated reinforced concrete column (1), the short-section prefabricated reinforced concrete column (2), the column end rubber cushion layer (3) and the inter-column rubber cushion layer (4) in the split column unit are integrally connected in series through the prestressed steel strand (5) and are anchored in the top-bottom beam.
In this example, the long-section precast reinforced concrete column (1) and the short-section precast reinforced concrete column (2) are square-section precast reinforced concrete columns with the same section, vertical through round holes are reserved in the middle of the columns, and the columns are precast in reinforced concrete member processing plants according to corresponding sizes and transported to the site for splicing.
In this example, the column end rubber cushion layer (3) is made of a cross-section rubber barrier and a square-section rubber barrier. The cross-section rubber partitions are used for separating the four split column units, and the square-section rubber partitions are used for separating the split column units and the top bottom beam.
In the example, the rubber cushion layer (4) between the columns is made of three rubber partitions with square sections. The horizontal rubber barrier is used for separating the long-section prefabricated reinforced concrete column and the long-section prefabricated reinforced concrete column which are adjacent to each other on the bottom surface in the same split column unit, or the adjacent long-section prefabricated reinforced concrete column and the short-and-long-section prefabricated reinforced concrete column; the vertical rubber partitions are used for partitioning long-section prefabricated reinforced concrete columns and long-section prefabricated reinforced concrete columns which are adjacent to the side surfaces in the adjacent split column units, or long-section prefabricated reinforced concrete columns and short-and-long-section prefabricated reinforced concrete columns which are adjacent to the side surfaces.
In the embodiment, the prestressed steel strands (5) are anchored in the top and bottom beams in a crossed manner, the prestressed steel strands connected with the left split column units in series are anchored on the right sides of the top and bottom beams, and the prestressed steel strands connected with the right split column units in series are anchored on the left sides of the top and bottom beams.
In this example, the dimensions of the long-segment precast reinforced concrete columns are (length W × width W × height H), the gaps between the segment precast reinforced concrete columns and the gaps between the column-end split columns and the top-bottom beams are both D, and the dimensional relationships of the components should satisfy the following relationships:
height H of long-segment prefabricated reinforced concrete column1＝H。
Height H of short-segment prefabricated reinforced concrete column2＝(H-D)/2。
Length and width A of column end rubber cushion layer1＝2W+D。
Total height B of column end rubber cushion1＝(H-D)/4+D。
Column end rubber cushion layer square section rubber partition thickness C1＝D。
Column end rubber cushion layer cross-section rubber partition thickness D1＝D。
Rubber pad between columnsLayer length and width A2＝W+D。
Total height B of rubber cushion between columns2＝(H-D)/4+D/2。
Rubber spacer thickness C in horizontal direction of rubber cushion layer between columns2＝D/2。
Vertical rubber partition thickness D of rubber cushion layer between columns2＝D。
Claims (2)
1. The utility model provides a be used for prefabricated fissure of displacement of underground structure to assemble segmentation components of a whole that can function independently post which characterized in that: the split column consists of a long-section prefabricated reinforced concrete column (1), a short-section prefabricated reinforced concrete column (2), a column end rubber cushion layer (3), an inter-column rubber cushion layer (4) and prestressed steel strands (5); the long-section prefabricated reinforced concrete columns (1) are sequentially stacked along the height direction, and one short-section prefabricated reinforced concrete column (2) is placed at one end of each long-section prefabricated reinforced concrete column to form a split column unit; the four split column units are combined into a whole in a mode of two rows and two columns, and gaps are reserved among the split column units; the column end rubber cushion layers (3) are arranged at two end parts of the split column unit and are respectively connected with the top bottom beam; the inter-column rubber cushion layer (4) is arranged in the middle of the split column units, each long-section prefabricated reinforced concrete column (1) and each short-section prefabricated reinforced concrete column (2) are separated, and gaps between the section prefabricated reinforced concrete columns in two adjacent split column units are staggered; the long-section prefabricated reinforced concrete column (1), the short-section prefabricated reinforced concrete column (2), the column end rubber cushion layer (3) and the inter-column rubber cushion layer (4) in the split column unit are integrally connected in series by the prestressed steel strand (5) and are anchored in the top-bottom beam;
the long-section prefabricated reinforced concrete column (1) and the short-section prefabricated reinforced concrete column (2) are square-section prefabricated reinforced concrete columns with the same section, vertical through round holes are reserved in the middle of the long-section prefabricated reinforced concrete columns, are prefabricated in a reinforced concrete component processing factory according to corresponding sizes, and are transported to the site for assembly;
the column end rubber cushion layer (3) is made of rubber partitions with cross sections and rubber partitions with square sections; the cross-section rubber partition is used for partitioning four split column units, and the square-section rubber partition is used for partitioning the split column units and the top and bottom beams;
the inter-column rubber cushion layer (4) is made of three rubber partitions with square cross sections; the horizontal rubber barrier is used for separating the long-section prefabricated reinforced concrete column and the long-section prefabricated reinforced concrete column which are adjacent to each other on the bottom surface in the same split column unit, or the adjacent long-section prefabricated reinforced concrete column and the short-section prefabricated reinforced concrete column; the vertical rubber partitions are used for partitioning long-section prefabricated reinforced concrete columns and long-section prefabricated reinforced concrete columns which are adjacent to the side surfaces in the adjacent split column units, or long-section prefabricated reinforced concrete columns and short-section prefabricated reinforced concrete columns which are adjacent to the side surfaces.
2. The prefabricated staggered sectional split column for underground structures according to claim 1, wherein: the prestressed steel strands (5) are anchored in the top and bottom beams in a crossed mode, the prestressed steel strands connected with the left split column units in series are anchored on the right sides of the top and bottom beams, and the prestressed steel strands connected with the right split column units in series are anchored on the left sides of the top and bottom beams.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202543788U (en) * | 2012-04-24 | 2012-11-21 | 上海市政工程设计研究总院（集团）有限公司 | Precast segment assembly pier structure |
| CN106351257A (en) * | 2016-10-14 | 2017-01-25 | 北京工业大学 | Built-in separation plate prefabricated separate post for underground structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102691363A (en) * | 2011-03-25 | 2012-09-26 | 洛阳原生建筑工程技术有限公司 | Foam concrete composite heat preservation wall body with concrete blocks and construction method thereof |
| CN202099876U (en) * | 2011-04-15 | 2012-01-04 | 林永军 | Break bridge node connecting piece |
| KR101277086B1 (en) * | 2012-10-30 | 2013-06-19 | 주식회사 한길 | Fabrication rain water manhole and the method of construction |
| CN205134353U (en) * | 2015-11-17 | 2016-04-06 | 西安建筑科技大学 | Prevent frostbite and pull out and melt a heavy assembly type ventilation stake foundation structure |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202543788U (en) * | 2012-04-24 | 2012-11-21 | 上海市政工程设计研究总院（集团）有限公司 | Precast segment assembly pier structure |
| CN106351257A (en) * | 2016-10-14 | 2017-01-25 | 北京工业大学 | Built-in separation plate prefabricated separate post for underground structure |
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