JP4625692B2 - Building construction method of base-isolated structure with laminated rubber bearing - Google Patents

Description

  The present invention relates to a construction method of a column base portion of a base structure of a seismic isolation structure using a steel structure using a laminated rubber bearing (hereinafter sometimes referred to as S structure) or a steel reinforced concrete structure (hereinafter also referred to as SRC structure). Laminated rubber bearings that belong to the technical field, and more specifically, have been devised so that the center of the steel column in the steel structure of the base structure part of the seismic isolation structure can be easily and accurately aligned with the center of the laminated rubber bearing. It relates to the building construction method of seismic isolation structures.

In the construction of seismic isolation structures, laminated rubber bearings having a restoring force are often used.
Patent Document 1 below discloses a joint structure between a laminated rubber support and an SRC column. In short, on the upper surface of the base plate that is placed on the upper flange of the laminated rubber bearing and joined with bolts, an upward height adjustment member with bolts and nuts is raised vertically upward, and this is joined to the plate at the bottom of the steel column. Adjust and support height and steel column verticality. Thereafter, a grout material such as mortar is filled in the gap between the base plate and the plate at the lower end of the column, and a sufficiently hard support piece is inserted and supported. After that, a column base is constructed in which concrete is cast and the SRC column and the laminated rubber bearing are joined.

JP-A-9-177366

In the case of the column base part joining method described in Patent Document 1 above, an upward height adjusting member by a bolt and a nut is placed vertically upward on the upper surface of a base plate that is mounted on the upper flange of a laminated rubber bearing and bolted. This is combined with the plate at the lower end of the steel column to adjust and support the height and the verticality of the steel column, and then grout material such as mortar in the gap between the base plate and the plate at the lower end of the column It is troublesome to use a lot of man-hours and steadily proceed the joining work according to the procedure, such as inserting and supporting a sufficiently hard support piece and then placing concrete afterwards. is there. Nevertheless, no consideration is given to the centering work for matching the center of the column with the center of the laminated rubber bearing.
However, as a practical matter, the centering work with the laminated rubber bearing when the steel structure is suspended is prepared by performing inking etc. in advance. Unless there is a standard that can be confirmed, it is common knowledge of field workers that it is difficult to be accurate, and it is a problem experienced by many workers that it takes time and effort.

  Accordingly, an object of the present invention is to align and join the center of the steel column and the center of the laminated rubber bearing, particularly in the construction of the column base portion of the S structure or SRC seismic isolation structure using the laminated rubber bearing. The aim is to provide a building construction method for seismic isolation structures with laminated rubber bearings that has been improved and devised so that work can be performed easily and accurately.

As means for solving the above-mentioned problems of the prior art, the building construction method of the seismic isolation structure by the laminated rubber support according to the invention described in claim 1 is:
Installing the positioning member 7 vertically upward at the center of the upper surface of the upper flange 2a of the laminated rubber support 2 fixed on the foundation 1,
A lower surface of the steel structure 3 made of steel beams and steel columns 4 for constituting the base portion of the seismic isolation structure, the installing the positioning member 8 vertically downward to the column center position directly below the steel column 4 Installing a temporary placing table 9 having the same thickness as the concrete covering thickness on the lower surface of the steel beam and temporarily placing it on the upper surface of the horizontal fixing member 10 provided on the flooring concrete 6 on the ground;
The steel structure 3 is suspended in a substantially horizontal posture, the positioning member 8 on the lower surface thereof is matched with the position of the positioning member 7 of the laminated rubber support 2, and the temporary mounting table 9 is moved to the horizontal fixing member. 10 is temporarily placed on the upper surface of the steel plate 10 and the horizontal position of the steel structure 3 is maintained in that position;
Consists of a step of building the outer peripheral portion and Steel or steel reinforced concrete foundation beam portion of the concrete 13 on the upper flange 2a of the laminated rubber bearing 2 Da設seismic isolation structure of the steel structure 3, a vertical load It is transmitted to the laminated rubber bearing through the concrete part.

The building construction method of the seismic isolation structure by the laminated rubber bearing according to the invention described in claim 2 is:
Installing the positioning member 7 vertically upward at the center of the upper surface of the upper flange 2a of the laminated rubber support 2 fixed on the foundation 1,
A lower surface of the steel structure 3 made of steel beams and steel columns 4 for constituting the base portion of the seismic isolation structure, the installing the positioning member 8 vertically downward to the column center position directly below the steel column 4 Installing a temporary placing table 9 having the same thickness as the concrete covering thickness on the lower surface of the steel beam and temporarily placing it on the upper surface of the horizontal fixing member 10 provided on the flooring concrete 6 on the ground;
The steel structure 3 is suspended in a substantially horizontal posture, the positioning member 8 on the lower surface thereof is made to coincide with the position of the positioning member 7 of the laminated rubber support 2, and the temporary placing table 9 is fixed to the horizontal fixing member. Temporarily placing it on the top surface of the steel plate 10 and maintaining the horizontal posture of the steel structure 3 in its position;
A foundation beam bottom mold 11 is laid on the outer periphery of the upper flange 2a of the laminated rubber support 2, and a binding material 12 such as a stud for integrating with concrete is provided on the upper surface of the upper flange 2a of the laminated rubber support 2. The method includes a step of placing concrete 13, and a vertical load is transmitted to the laminated rubber support 2 through the concrete portion 13.

The invention described in claim 3 is the building construction method of the seismic isolation structure by the laminated rubber support described in claim 1 or 2,
One of the positioning member 7 installed at the center of the upper surface of the upper flange 2a of the laminated rubber support 2 and the positioning member 8 installed on the lower surface of the steel structure 3 is a tubular member, and the other is a hollow of the tubular member. A rod-shaped member having an outer diameter and a shape that can be closely inserted into the portion is formed, and the positions of both members are matched by inserting the rod-shaped member into the hollow portion of the tubular member.

The invention described in claim 4 is the building construction method of the seismic isolation structure by the laminated rubber support described in claim 1 or 2,
The laminated rubber support 2 is installed at the upper end of the foundation pile 1.

According to the building construction method of the base-isolated structure with laminated rubber according to the invention described in claims 1 to 4, particularly in the construction of the S-structure or SRC-base isolated structure using the laminated rubber bearing 2, the steel column 4 Alignment and joining operations for matching the center of the laminated rubber support 2 with the center of the laminated rubber support 2 are made to coincide with the positioning member 7 of the upper flange 2a of the laminated rubber support 2 and the position of the positioning member 8 on the lower surface of the steel column. It can be done reliably and efficiently with simple tasks that are physically and visually clear.
The steel structure 3 positioned as described above is easily seismically isolated in a short construction period by assembling (or laying) a concrete frame 13 in a state where it is temporarily placed in a horizontal position at that position. You can build the column base of objects.

The positioning member 7 is installed vertically upward at the center of the upper surface of the upper flange 2a of the laminated rubber support 2 fixed on the foundation 1. On the other hand, a lower surface of the steel structure 3 made of steel beams and steel columns 4 for constituting the base portion of the seismic isolation structure, the positioning member 8 vertically downward to the column center position directly below the steel column 4 installed At the same time, a temporary placement table 9 having the same thickness as the concrete covering thickness on the lower surface of the steel beam and temporarily placed on the upper surface of the horizontal fixing member 10 provided on the flooring concrete 6 on the ground is installed . The steel structure 3 is suspended in a substantially horizontal posture, the positioning member 8 on the lower surface thereof is matched with the position of the positioning member 7 of the laminated rubber support 2, and the temporary mounting table 9 is moved to the horizontal fixing member. 10 is temporarily placed on the upper surface, and the horizontal posture of the steel structure 3 is maintained in that position . Thereafter, to construct the peripheral portion and S granulation or SRC Concrete foundation beam portion of the concrete 13 on the upper flange 2a of the laminated rubber bearing 2 Da設seismic isolation structure of the steel structure 3.

Hereinafter, based on FIGS. 1-3, the Example of the building construction method of the seismic isolation structure by the laminated rubber support which concerns on this invention is described.
FIG. 1 shows a steel beam that forms a foundation part of an S-structure or SRC-type seismic isolation structure while a laminated rubber bearing 2 is installed on the footing upper end surface of a cast-in-place concrete pile 1 adopted as the foundation of the base isolation structure. And a steel structure 3 composed of steel columns 4 (column base portions in the illustrated example) are suspended by a wire 5 such as a crane (not shown) . Reference numeral 6 denotes a flooring concrete on the ground.

  The laminated rubber bearing 2 is installed with its lower flange fixed to the upper end surface of the footing of the cast-in-place concrete pile 1 with an anchor bolt prepared in advance. However, the foundation of the base isolation structure is not limited to the cast-in-place concrete pile 1. It can carry out similarly about the well-known various foundations employable as a foundation of a seismic isolation structure. On the upper flange 2a of the laminated rubber support 2, a tubular member 7 as a positioning member is installed vertically upward at the center of the upper surface (the central part of the laminated rubber support 2). On the other hand, it can be closely inserted into the hollow portion of the tubular member 7 as a positioning member at the column center position immediately below the steel column 4 on the lower surface of the steel structure 3 constituting the base part of the seismic isolation structure. A rod-shaped member 8 having an outer diameter and a shape is previously installed vertically downward. In addition, on the lower surface of the steel structure 3, a temporary placement table 9 for temporarily placing it in a horizontal posture is also provided until concrete is placed on the outer periphery of the steel structure 3 and cured as described later. . As shown in FIG. 2, the temporary placement table 9 is temporarily placed on a horizontal fixing member 10 prepared and prepared on the flooring concrete 6 in advance.

Therefore, the suspension work of the steel structure 3 is performed by suspending the steel structure 3 composed of the steel beam and the steel column 4 in a substantially horizontal posture and carrying the steel structure 3 to a position directly above the laminated rubber support 2. An alignment operation for fitting the rod-shaped member 8 into the hollow portion of the tubular member 7 of the laminated rubber support 2 is performed. Thus, when the positions of the tubular member 7 and the rod-shaped member 8 coincide with each other, the temporary placing table 9 of the steel structure 3 is temporarily placed on the horizontal fixing member 10 in the horizontal posture with the positions.

After that, a foundation beam bottom formwork 11 for placing concrete is laid on the outer periphery of the steel structure 3 and the outer periphery of the upper flange 2a of the laminated rubber support 2, and in the case of SRC construction, the necessary reinforcing bars Reinforce and assemble. In addition, a bonding material 12 such as a stud that is intended to be integrated with the placement concrete is provided in advance on the upper surface of the upper flange 2a of the laminated rubber support 2, and the concrete 13 is placed, and the S structure of the seismic isolation structure is formed. Alternatively, the SRC foundation beam part is constructed.
As is apparent in FIG. 3, because of the temporary placement table 9 of the steel structure 3, a concrete fog thickness and same size of steel structures 3, the base beam portion of the S-forming or SRC Zomen Isolated structures and The vertical load of the steel column 4 is transmitted to the laminated rubber support 2 through the concrete covering portion 13. In this case, a thick steel pipe may be adopted as the tubular member 7 of the laminated rubber support 2 and used as a vertical load transmission element.

  Although the present invention has been described above based on the illustrated embodiments, of course, the technical idea of the present invention is not limited to the above embodiments. The present invention can be implemented in various ways including design changes and application modifications that are usually made by those skilled in the art without departing from the gist and technical idea of the present invention.

It is an elevation view which shows the operation | work point which suspends a steel structure on a laminated rubber support. It is an elevation view which shows the temporary placement state of the steel beam suspended on the laminated rubber support. It is an elevation which shows the state which performed concrete placement of the foundation beam part.

Explanation of symbols

1 Foundation (cast-in-place concrete pile)
2 Laminated rubber support 2a Upper flange 3 Steel structure 4 Steel column 7 Positioning member (tubular member)
8 Positioning member (bar-shaped member)
9 Temporary table 10 Horizontal fixing member 11 Bottom mold 12 Bonding material 13 Casting concrete

Claims (4)

Installing the positioning member vertically upward at the center of the upper surface of the upper flange of the laminated rubber bearing fixed on the foundation;
A lower surface of the steel structure consisting of steel beams and steel columns constituting a base portion of the seismic isolation structure, the installing the positioning member vertically downward to the column center position immediately below steel column, the lower surface of the steel beam Installing a temporary table for temporarily placing on the upper surface of the horizontal fixing member provided on the floor-mounted concrete having the same thickness as the concrete covering thickness ;
The steel structure is suspended in a substantially horizontal posture, the positioning member on the lower surface thereof is matched with the position of the positioning member of the laminated rubber bearing, and the temporary placing table is temporarily placed on the upper surface of the horizontal fixing member. And maintaining the horizontal posture of the steel structure in that position,
Consists of a step of building the outer peripheral portion and Steel or steel reinforced concrete foundation beam portion of the concrete was Da設seismic isolation structure on the upper flange of the laminated rubber bearing of the steel structure, the vertical load is the concrete part Building construction method of seismic isolation structure with laminated rubber bearing, characterized in that it is transmitted to laminated rubber bearing through Installing the positioning member vertically upward at the center of the upper surface of the upper flange of the laminated rubber bearing fixed on the foundation;
A lower surface of the steel structure consisting of steel beams and steel columns constituting a base portion of the seismic isolation structure, the installing the positioning member vertically downward to the column center position immediately below steel column, the lower surface of the steel beam Installing a temporary table for temporarily placing on the upper surface of the horizontal fixing member provided on the floor-mounted concrete having the same thickness as the concrete covering thickness ;
The steel structure is suspended in a substantially horizontal posture, the positioning member on the lower surface thereof is matched with the position of the positioning member of the laminated rubber bearing, and the temporary placing table is temporarily placed on the upper surface of the horizontal fixing member. And maintaining the horizontal posture of the steel structure in that position,
Laying the foundation beam bottom formwork on the outer periphery of the upper flange of the laminated rubber bearing, and placing a binding material such as a stud for integration with the concrete on the upper surface of the upper flange of the laminated rubber bearing, and placing the concrete The building construction method of the seismic isolation structure by the laminated rubber bearing, wherein the vertical load is transmitted to the laminated rubber bearing through the concrete portion. One of the positioning member installed at the center of the upper surface of the upper flange of the laminated rubber bearing and the positioning member installed on the lower surface of the steel structure is a tubular member, and the other is closely inserted into the hollow portion of the tubular member. 3. A seismic isolation with a laminated rubber support according to claim 1 or 2, characterized in that the rod-shaped member has a possible outer diameter and shape, and the positions of both are matched by inserting the rod-shaped member into the hollow portion of the tubular member. The construction method of the structure. 3. The building construction method for a seismic isolation structure using a laminated rubber bearing according to claim 1, wherein the laminated rubber bearing is installed at an upper end of a foundation pile.

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