JP3543139B2 - Concrete-filled steel tubular column based on steel-framed reinforced concrete basement wall and its construction method - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a structure constructed on the basis of a steel reinforced concrete structure (hereinafter abbreviated as "SRC structure") and an underground wall (including the concept of a continuous underground wall or an underground beam; the same applies hereinafter). For example, when an underground wall can be installed in only one direction in a layout sandwiching a track, a road, and the like, a concrete-filled steel pipe supported on the SRC underground wall based on the SRC underground wall constructed in one direction. The present invention relates to a structure such as a station building constructed in an upper space such as a track using columns (hereinafter abbreviated as “CFT columns”) and a method of constructing the same.
[0002]
[Prior art]
Due to prerequisites such as straddling tracks, roads, rivers, etc., when installing an underground wall (foundation beam) in one direction parallel to the track, etc. As the basic structure, for example, the structure shown in FIG. 5 is known. The underground walls b, b of reinforced concrete construction (hereinafter abbreviated as “RC construction”) are provided in such a manner that a subway a provided in one direction indicated by an arrow m is interposed therebetween. , B are also used as a support pile and a foundation beam, and an upper structure c supported by a column e such as RC or SRC is constructed on the upper part thereof.
[0003]
[Problems to be solved by the present invention]
In the structure based on the RC basement wall in FIG. 5 described above, it is difficult to effectively transmit the axial force, bending moment, and horizontal force of the column e to the basement wall b when the load of the upper structure c increases. It becomes. As a result, the wall thickness of the upper part of the underground wall b becomes as large as 2 to 3 m, and it may not be able to be carried out depending on site conditions. In this regard, the SRC basement wall (see, for example, Japanese Patent Application Laid-Open No. 6-193049) has the advantage that the out-of-plane bending strength and shear strength are large, and the SRC basement wall is replaced with the RC basement wall. It has been proposed to be used as a foundation beam. However, even in this case, in order to effectively transmit the axial force, bending moment, and horizontal force of the upper structure, the wall thickness becomes considerably large similarly to the RC basement wall, and it is impossible to implement it depending on the conditions. Occurs.
[0004]
By the way, CFT columns have advantages such as high toughness, high proof stress, and a relatively small effective area. Therefore, it is conceivable that the CFT column is used as a column of the upper structure, and the RC or SRC underground wall is applied to a foundation beam (column base). However, in order to use an RC or SRC underground wall as a column base of a CFT column, there is a technical problem on how to achieve structural and mechanical integration of the two.
[0005]
Therefore, an object of the present invention is to provide a special foundation beam effectively, especially in a case where the foundation beam can be installed in only one direction, effectively controlling the axial force, bending moment, horizontal force, etc., which the CFT columns of the ground structure bear. A structure that uses CFT columns based on SRC underground walls, and a structure that can establish a structure that can be transmitted to SRC underground walls without using it and can effectively use the space above tracks, rivers, roads, etc. An object of the present invention is to provide a construction method implemented for construction of a building.
[0006]
[Means for Solving the Problems]
As means for solving the above-mentioned problems of the prior art, a structure using a CFT column based on an SRC basement wall according to the invention described in claim 1 is as follows.
An SRC basement wall and a plurality of CFT columns having a required height on the ground by integrating a base portion near the ground surface of the SRC basement wall are provided, and a superframe frame is assembled between the upper portions of the CFT columns. Building the superstructure with
The SRC basement wall is provided with a plurality of steel members vertically arranged at intervals in the longitudinal direction thereof, and longitudinal and transverse streaks arranged longitudinally on both outer sides of the steel members. A tubular iron plate formed in a tubular shape having a size capable of externally winding the streaks and having a required height is provided in the vicinity of the ground surface so as to surround the steel frame member and the vertical and horizontal streaks, and is provided in an underground wall below the tubular iron plate. Pour concrete and cast a concrete-filled steel tubular column with its lower end placed on the top end of the pre-cast concrete in the tubular iron plate, and cast post-cast concrete inside the tubular iron plate Thus, the SRC basement wall and the CFT column are integrated .
[0008]
The invention described in claim 2 is the structure of the CFT Columns applications based upon SRC Concrete basement walls according to the invention described in claim 1,
A stud for integrating with concrete is attached to each outer surface of an upper portion of a steel frame member for reinforcing an SRC basement wall and a lower portion of a steel pipe forming a CFT column.
[0009]
The construction method of a structure applied to a CFT column based on an SRC basement wall according to the invention described in claim 3 ,
B) A plurality of steel members arranged at intervals in the longitudinal direction of the underground wall are provided in the vertical direction in the underground wall, and vertical and horizontal stripes are provided on both outer sides of the steel frame members, and the vertical and horizontal stripes can be wound around the outside. A tubular tubular iron plate formed at a required height is provided so as to surround a steel frame member and vertical and horizontal streaks near the surface of the ground, and an underground wall below the tubular iron plate is filled with pre-cast concrete to fill the SRC basement. Constructing a wall,
B) After the precast concrete has hardened, a steel pipe having a required height is erected on the ground so that the lower end is placed on the top end of the precast concrete in the tubular iron plate, and the steel pipe and the tubular iron plate are mounted. Constructing a CFT column integrated with the SRC underground wall near the surface by post-casting concrete inside each;
C) assembling a superframe structure between the upper portions of a plurality of CFT columns built on the basement of the SRC basement wall to construct an upper structure.
[0010]
The invention described in claim 4 is the method of constructing the structure of CFT Columns applications based upon SRC Concrete basement walls according to the invention described in claim 3,
It is characterized in that studs that are integrated with concrete are previously attached to the outer surfaces of the upper part of the steel frame member that reinforces the SRC basement wall and the lower part of the steel pipe that forms the CFT column.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
As described in claim 1, the structure using the SRC basement wall based on the SRC basement wall of the present invention is an underground SRC basement wall 1 and integrated with the SRC basement wall 1 to be on the ground. A plurality of CFT columns 6 having a required height are provided, and an upper structure is constructed by assembling a superframe frame called a so-called mega truss between upper portions of the CFT columns 6. Therefore, even if the upper structure is heavy and a large axial force, bending moment, or horizontal force is applied to the CFT column 6, it is effectively transmitted to the SRC basement wall 1 and safely processed.
[0012]
More specifically, the SRC basement wall 1 is composed of a plurality of vertical steel members 2... Arranged at intervals in the longitudinal direction thereof, and vertical and horizontal streaks arranged on both outer longitudinal sides of the steel member 2. And a plurality of the steel members 2... And a tubular tubular iron plate 4 having a size capable of externally winding the vertical and horizontal streaks 3 and formed at a required height. First, a precast concrete 10 is poured into an underground wall 9 below the tubular iron plate 4, and the lower end is placed on the top end of the precast concrete 10 in the tubular iron plate 4. CFT columns 6 are erected, and after-cast concretes 11 and 12 are cast inside the tubular iron plate 4 surrounding the CFT columns 6, so that the SRC basement wall 1 and the CFT columns 6 are structurally strong. The structure integrated with the above is suitably implemented. Therefore, the CFT column 6 is formed integrally with the SRC basement wall 1 via the tubular iron plate 4 and the concrete 11 filled in the tubular iron plate 4 on the upper part thereof, using the base plate as the pillar base. In this case, the outer periphery of the concrete 11 is firmly restrained by the tubular iron plate 4, and the degree of adhesion to the CFT columns 6 is increased. In other words, the underground wall portion using the tubular iron plate 4 can be conceptually regarded as a CFT column in a broad sense in which the concrete 11 is laid therein, and exerts a great strength. Therefore, it is not necessary to increase the thickness of the SRC basement wall 1 unnecessarily, and it is hard to be restricted by site conditions. In addition, the size of the tubular iron plate 4 capable of winding the vertical and horizontal streaks 3 around the outside is defined as the ends provided between the vertical and horizontal streaks 3 disposed on both outer sides of the steel frame member 2 and the underground wall 9 and the steel frames at both ends. It means a size necessary and sufficient for bonding outside the member 2 (see FIG. 1).
[0013]
According to the present invention, in order to increase the degree of adhesion to the cast concrete 11 as much as possible, the upper part of the steel member 2 (the part surrounded by the tubular iron plate 4) for reinforcing the SRC basement wall 1 as in claim 2. ), And studs 5 and 8 are attached to each outer surface of the lower part of the steel pipe 7 forming the CFT column 6 (the part also surrounded by the tubular iron plate 4). The above superstructure is reasonably constructed with the contents described in claim 3 .
[0014]
First, a plurality of steel members 2 arranged at intervals in the longitudinal direction of the underground wall 9 are provided in the vertical direction inside the underground wall 9, and the longitudinal and horizontal stripes 3 are provided in the longitudinal direction on both outer sides of the steel member 2, and a tubular iron plate is provided. 4 is provided so as to surround the steel member 2 and the vertical and horizontal stripes 3 near the ground surface. The tubular iron plate 4 has a size that allows the steel member 2 and the vertical and horizontal streaks 3 to be wound around the outside, and is formed at a required height (height required for integrating the underground wall with the CFT columns). Then, the pre-cast concrete 10 is poured into the underground wall 9 below the tubular iron plate 4 and the SRC underground wall 1 is constructed.
[0015]
After the precast concrete 10 has hardened and developed a predetermined strength, the CFT column 6 or the steel pipe 7 for the required height on the ground is placed at an intermediate position between the steel frame members 2. It is built with the lower end placed on the top end of the precast concrete 10. After that, when the steel pipe 7 is used, concrete 12 is cast inside the steel pipe 7 and post-cast concrete 11 is cast inside the tubular iron plate 4. Thus, the CFT columns 6 that are firmly integrated with the SRC basement wall 1 near the ground surface are constructed.
[0016]
An upper structure is constructed by assembling a superframe frame between the upper portions of a plurality of CFT columns 6 built using the SRC basement wall 1 as a foundation beam or a column base as described above. The present invention relates to the construction of a station building in the upper space of a track, an elevated track on a bridge or a road, an elevated track on a road, and a structure such as an overpass by combining with a mega truss or the like utilizing the high strength of CFT columns. It is feasible to construct objects. Even if the underground wall is installed in only one direction as described above, a safe upper structure can be rationally constructed without unnecessarily increasing the wall thickness of the SRC structure underground wall.
[0017]
【Example】
Next, an embodiment relating to a station building constructed in a place where underground walls (foundation beams) can be installed in only one direction on both sides of the track will be described with reference to FIGS. As shown in FIG. 1, the (building body) 16 of the station building is integrated with a base near the surface of the SRC basement wall 1 provided in parallel and opposed to each other across a plurality of tracks 13. It is constructed by assembling a superframe between the upper parts of the CFT columns 6.
[0018]
As shown in FIGS. 2 to 4, the relationship between the SRC basement wall 1 and the CFT column 6 as one construction unit will be described. The steel member 2 which is a reinforcing material for the basement wall is not large enough to reach the support layer. A plurality of studs 5 are formed on both outer surfaces of the web and the outer surface of the flange in the range of about 3 to 4 m from the upper end (that is, the portion surrounded by the tubular iron plate 4) from the upper end thereof. It is attached in a typical arrangement. In one construction unit, the four H-shaped steels are provided deep in the vertical direction in the underground wall 9 at an interval of about 1 m each. On both outer sides of the H-section steel 2, vertical and horizontal streaks 3, 3 having a length reaching the support layer are also provided in the longitudinal direction. Further, a tubular iron plate 4 capable of externally winding the two vertical and horizontal stripes 3 and 3 is provided so as to surround the H-shaped steel 2 and the vertical and horizontal stripes 3 in the vicinity of the ground surface (a depth of 3 to 4 m from the ground). The tubular iron plate 4 is made of a steel plate having a thickness of about 20 mm, and has a depth of about 1.4 to 1.5 m, a length of about 4 to 5 m, and a height of about 3 to 4 m. Next, a pre-cast concrete 10 is poured into an underground wall 9 below the lower end of the tubular iron plate 4 to construct a deep SRC underground wall 1 in the ground (see FIG. 3B). At the stage where the precast concrete 10 has developed strength, the lower end of the steel pipe 7 for CFT columns is placed on the top end of the precast concrete 10 at an intermediate position between the H-shaped steels 2 in the tubular iron plate 4. The steel pipe is erected in a form to be mounted. The steel pipe 7 is a square steel pipe having a thickness of about 20 mm and a length of one side of about 800 mm, and has a height of about 7 to 8 m. A plurality of studs 8 are regularly arranged on the outer surface of the steel pipe 7 in a range of 3 to 4 m above the lower end (that is, a portion surrounded by the tubular iron plate 4). Post-cast concretes 11 and 12 are cast inside each of the steel pipe 7 and the tubular iron plate 4, and the SRC basement wall 1 and the CFT columns 6 are structurally formed by hardening and developing the concretes 11 and 12. A CFT column 6 which is firmly integrated and has the SRC basement wall 1 as a column base or a foundation beam is constructed (FIG. 4B). That is, the lower part of the CFT column 6 is integrated with the concrete 11 cast into the tubular iron plate 4 on the upper part of the SRC basement wall 1. The outer periphery of the concrete 11 is firmly restrained by the tubular iron plate 4, and the degree of adhesion to the CFT columns 6 is increased. Therefore, even in the case of a large structure that receives a large load such as the station building 16, the axial force, bending moment, and horizontal force of the CFT column 6 are effectively and safely transmitted to the SRC basement wall 1.
[0019]
[Effects of the present invention]
ADVANTAGE OF THE INVENTION According to the structure of the CFT column application based on the SRC basement wall which concerns on this invention, and the construction method, the axial force, bending moment, and horizontal force of the CFT column of a ground structure can be provided without providing a special foundation beam. As a result, a structure can be obtained in which the SRC-structured continuous underground wall of the foundation structure efficiently transmits to the foundation. In addition, by utilizing the high strength of the CFT column and combining it with a mega truss, etc., effective use of the space above tracks, rivers, roads, etc. can be achieved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a construction state of a station building with a focus on a basic part.
FIGS. 2A and 2B are a plan view and a cross-sectional view showing a construction state of an SRC basement wall.
FIGS. 3A and 3B are a plan view and a cross-sectional view showing a built-in state of a CFT column.
FIGS. 4A and 4B are a plan view and a cross-sectional view showing a concrete pouring procedure.
FIG. 5 is an overall view showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 SRC basement wall 2 Steel member 3 Vertical and horizontal bars 4 Tubular iron plate 5,8 Stud 6 CFT column 7 Steel pipe 9 Underground wall 10 Precast concrete 11,12 Postcast concrete

Claims (4)

A steel-reinforced reinforced concrete basement wall, and a plurality of concrete-filled steel pipe columns having a required height on the ground integrated with a base near the surface of the steel-reinforced concrete basement wall, The superstructure is constructed with a superframe frame between them,
The steel-framed reinforced concrete basement wall is provided with a plurality of steel members vertically arranged at intervals in a longitudinal direction thereof and vertical and horizontal bars arranged longitudinally on both outer sides of the steel members. And a tubular iron plate formed in a tubular shape having a size that allows the vertical and horizontal streaks to be wound outside and having a required height is provided in the vicinity of the ground surface around the steel frame member and the vertical and horizontal streaks, and in an underground wall below the tubular iron plate. Pre-cast concrete is poured in, and a concrete-filled steel tubular column is mounted on the top end of the pre-cast concrete in the tubular iron plate with its lower end placed thereon, and post-cast concrete is placed inside the tubular iron plate. characterized in that the steel reinforced concrete basement walls and concrete filled steel tube column are integrated by being pouring concrete based upon steel frame reinforced concrete basement walls Hama structure of the steel pipe columns applications. Wherein the upper of the steel member for reinforcing a steel reinforced concrete basement walls, stud integrated with the concrete to the outer surface of the lower portion of the steel pipe to form a concrete-filled steel tube column attached, according to claim 1 Concrete-filled steel tubular column-based structure based on a damaged steel reinforced concrete basement wall. B) A plurality of steel members arranged at intervals in the longitudinal direction of the underground wall are provided in parallel in the vertical direction in the underground wall, and vertical and horizontal streaks are provided on both outer sides of the steel frame members, and the vertical and horizontal streaks can be wound outside. A tubular steel plate of a size and formed to a required height is provided so as to surround a steel frame member and vertical and horizontal streaks near the surface of the ground, and a pre-cast concrete is filled in an underground wall below the tubular steel plate to form a steel reinforced concrete structure. Constructing an underground wall;
B) After the precast concrete has hardened, a steel pipe having a required height is erected on the ground so that the lower end is placed on the top end of the precast concrete in the tubular iron plate, and the steel pipe and the tubular iron plate are mounted. After-casting concrete inside each and constructing a concrete-filled steel tubular column integrated with a steel-framed reinforced concrete basement wall near the surface,
C) constructing a superframe by constructing a superframe frame between the upper portions of a plurality of concrete-filled steel tubular columns built on the basis of a steel reinforced concrete basement wall;
A method of constructing a concrete-filled steel tubular column-based structure based on a steel-framed reinforced concrete basement wall, characterized by comprising: Characterized the top of the steel member for reinforcing a steel reinforced concrete basement walls, that advance mounting studs integral with concrete on each outer surface of the lower portion of the steel tube forming the concrete-filled steel tube column, according to claim 3 Construction method of concrete-filled steel tubular column based on damaged steel reinforced concrete basement wall.

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