JPH09177366A - Joining structure of steel frame reinforced concrete column and seismic isolation device and joining method - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To make a fine adjustment of the height and the standing angle of a steel frame, and therefore to prevent the seismic isolation device from being deformed or eccentric, and to hold it vertically. Provide joint structure with seismic isolation device. SOLUTION: A plurality of plate members 1 provided with a shaft member 13 protruding from a predetermined position of a base plate 18 and a through hole 17 fixed to a predetermined position of a lower end surface of a steel column 11 and through which the shaft member penetrates.
2 and a fixing member 15 which is vertically movably engaged with the shaft member in order to support the plate body penetrating the shaft member at a predetermined height apart from the base plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining structure and a joining method for a steel reinforced concrete column and a seismic isolation device.

[0002]

2. Description of the Related Art Conventionally, seismic isolation devices are often applied to reinforced concrete structures, and a joining structure as shown in FIG. 3 is adopted. That is, the seismic isolation device 34 is placed on the foundation 37 whose height is adjusted by the mortar 36 or the like via the steel plate 35, and the seismic isolation device 34 is attached to the cap nut 3
It is fixed to the foundation 37 and the steel plate 35 with 8 and bolts 39.
Then, the steel plate 33 as a driving form to which the anchor bolts 32 are joined in advance is placed on the seismic isolation device 34,
Similarly, the cap nut 38 and the bolt 39 are used for fixing.

In a conventional steel-framed reinforced concrete column base, as shown in FIG. 4, a base plate 42 is fixed to the lower end surface of a steel frame 41, and anchor bolts 43 are embedded so as to project from a foundation 44. The steel frame 41 is erected so as to pass through the base plate 42, and a nut is screwed to the anchor bolt 43 and fixed to the foundation 44.

[0004]

When the steel frame is directly welded to the base plate as in the conventional steel frame reinforced concrete column pedestal, thermal strain occurs in the base plate. If the distorted base plate is placed on the seismic isolation device, there will be a gap between the top plate of the seismic isolation device and the base plate, and the contact surface will be insufficient. There is an eccentricity in the transmission of the vertical axial force to the seismic isolation device, which may cause the seismic isolation device to be always kept in a deformed state.

Further, when the steel frame is directly welded to the base plate as in the conventional case and the base plate is placed on the seismic isolation device and fixed with cap nuts or bolts, the height and the standing position of the steel frame are fixed when the steel frame is fully tightened. There is a problem in that it is difficult to finely adjust the installation angle and adjust it, and it becomes difficult to hold the steel frame and the seismic isolation device vertically.

The present invention has been made in order to solve the above-mentioned problems, and its purpose is to make it possible to easily finely adjust the height and the standing angle of the steel frame, thus causing the seismic isolation device to be deformed or eccentric. First, to provide a joint structure of a steel reinforced concrete column that can be held vertically and a seismic isolation device.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above objects, and its gist is a joint structure between a steel reinforced concrete column and a seismic isolation device, in which a base plate is provided on the seismic isolation device. Is mounted, a shaft member is projected at a predetermined position of this base plate, a plate body having a through hole is fixed at a predetermined position of the lower end surface of the steel frame, and the shaft member is passed through the through hole of the plate body. In the joining structure, each plate is supported and fixed at a predetermined height by a fixing member that is vertically movable and engaged with the shaft member.

Another object of the present invention is a method for joining a steel-framed reinforced concrete column and a seismic isolation device, in which a base plate having a plurality of shaft members protruding at predetermined locations is placed on the seismic isolation device. A fixing member is engaged with each of the shaft members at a predetermined height so as to be movable up and down, and a plurality of plate bodies having through holes fixed in advance at predetermined positions on the lower end surface of the steel frame are passed through the shaft member, respectively. A steel frame is erected by supporting the body with each fixing member, and by vertically moving each of the fixing members, it is possible to finely adjust the standing angle and height of the steel frame. .

In the joint structure of the present invention, the shaft member and the fixing member may be formed with a screw thread to be screwed with each other, whereby the fixing member can be engaged with the shaft member so as to be vertically movable. good.

In the joining structure of the present invention, a known laminated rubber can be used as the seismic isolation device.

[0011]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a side view of a joint structure of a steel reinforced concrete column of the present invention and a seismic isolation device when viewed from the direction of the one-dot chain line I-I in FIG. 2, and FIG. 2 is the one-dot chain line II- of FIG.
FIG. 2 is a cross-sectional view along II. 1 and 2, the joint structure 10 of the present invention includes a bolt 13 as a shaft member protruding from a predetermined position of a base plate 18 and a through hole 17 fixed to a predetermined position of the lower end surface of the steel column 11. Plate 12
And a nut 15 as a fixing member that is screwed into the bolt 13 and is vertically movable.

The bolt 13 is formed by welding a headless bolt to the base plate 18 in advance and fixing it. Here, the nut 15 and the plate body 12 at the lower end of the steel frame pillar
Is fixed by being screwed onto the bolt 13 at a height separated from the base plate 18 by a predetermined length. Further, the weight of the steel column 11 and the steel beam 24 is transmitted to the nut 15 via the plate body 12, and further transmitted from the bolt 13 to the base plate 18 and the seismic isolation device 20. Therefore, the diameter and the number of the bolts 13 are appropriately determined so that the bolts 13 and the nuts 15 can sufficiently support the weight of the steel columns 11 and the steel beams 24, and the screw thread dimensions of the bolts 13 and the nuts screwed thereto. Determine the diameter and length of 15. Further, the bolt 13 is more than the sum of the heights of the nuts 14 and 15 and the thickness of the plate body 12,
Further, it is formed longer by a predetermined length. That is, the nuts 14 and 15 and the plate body 12 which penetrate or screw into the bolt 13 can be moved in the vertical direction within a predetermined range along the bolt 13, and the fixing position thereof can be finely adjusted. Form to a sufficient length.

The plate body 12 has flanges 11a and 11a near the flanges 11a and 11b so that the weights of the steel frame columns 11 and the steel frame beams 24 can be dispersed downwardly in a well-balanced manner at the lower end surface of the steel frame column.
It is placed in c or near the corner 11b and welded. Further, by forming the through holes 17 to be larger than the diameter of the bolts 13, even if an error occurs in the arrangement position of the bolts 13 or the plate body 12, the errors are absorbed and all the through holes 17 are formed.
To allow the bolt 13 to pass through.

Although not shown in the plan view of FIG. 2, a headed stud bolt 19 is joined to a predetermined portion of the base plate 18 to improve the shear resistance between the base plate 18 and concrete. .
Further, since the base plate 18 is also used as a driving bottom mold for the steel-framed reinforcing bar, it is formed in the same shape as the cross-sectional shape of the steel-framed reinforcing bar.

Next, the joining method of the present invention will be described. First, the laminated rubber 20 as a seismic isolation device is placed on the lower foundation 23 via the steel plate 22, and these are fixed by the anchor bolts 21. Then, the base plate 18 is placed on the top plate 20a of the laminated rubber 20, and these are fixed by nuts and bolts 21. At this time, as the nut, a known cap nut (see the cap nut 38 in FIG. 3) can be used. When the cap nut is used, concrete flowing out from the bolt fixing position to the seismic isolation device side can be reduced during concrete pouring. can do.

Next, the nut 15 is screwed into the bolt 13 to be temporarily fixed at a height separated from the base plate 18 by a predetermined length, and then the bolt 13 is passed through the through hole 17 of the plate 12 to fix the steel column 11. Set up. Then, the standing angle and the position in the height direction of the steel column 11 are measured, and when the steel column 11 is not vertically standing, some nuts 15 are moved up or down to set the standing angle. If the position in the height direction is deviated, all nuts 15 are evenly moved up or down to finely adjust the position in the vertical direction. If so, fine adjustment is performed by appropriately combining the moving methods of the nut 15.

After finely adjusting the standing angle and the standing height of the steel column 11, the nut 14 is screwed into the bolt 13,
The plate body 14 is sandwiched and fixed with the nut 15. After the fixing, a grout material such as mortar is filled between the plate body 14 and the base plate 18. Further, before and after the nut 14 is screwed, the support piece 16 is arranged in the gap between the lower end surface of the steel frame column 11 and the surface of the base plate 18. The support piece 16 is formed to have a height that can be pushed into the gap and is in contact with the lower end surface of the steel column 11, and is made of a hard material that is not broken even by the pressure from the lower end surface of the steel column.

Next, reinforcing bars (not shown) are arranged around the steel columns 11 and the steel beams 24, and a mold is arranged around the reinforcing bars and the steel frames. Here, the bottom formwork of the steel reinforced column also serves as the base plate 18. When the concrete is placed after the formwork is installed and the formwork is removed after the concrete is hardened, the column base having the joint structure of the steel frame reinforced concrete column of the present invention and the seismic isolation device is completed.

[0019]

In the joint structure of the steel frame reinforced concrete column and the seismic isolation device of the present invention, a plurality of shaft members are provided at predetermined positions of the base plate, and a plurality of plate bodies having through holes are provided on the lower end surface of the steel column. Since a fixing member that is vertically movable and engaged with each shaft member is provided to support the plate body that is fixed and penetrates through each shaft member, the fixing member supports the steel column while supporting the shaft member. By moving it up and down while engaging the member, you can easily fine-tune the standing angle and standing height of the steel column,
Therefore, the seismic isolation device can be held vertically without causing deformation or eccentricity.

Also in the method of joining the steel-framed reinforced concrete column and the seismic isolation device of the present invention, similarly, the standing angle and height of the steel frame can be easily finely adjusted, so that the seismic isolation device is deformed or eccentric. Instead, it can be held vertically.

[Brief description of the drawings]

FIG. 1 is a side view of a joint structure between a steel reinforced concrete column and a seismic isolation device according to the present invention.

FIG. 2 is a sectional view taken along a dashed line II-II in FIG.

FIG. 3 is a side sectional view showing a conventional joint structure between a reinforced concrete column and a seismic isolation device.

FIG. 4 is a perspective view showing a leg structure of a conventional steel-framed reinforced concrete column.

[Explanation of symbols]

 10 Joint between steel reinforced concrete column and seismic isolation device 11 Steel column 12 Plate 13 Bolt (shaft member) 15 Nut (fixing member) 17 Through hole 18 Base plate 20 Laminated rubber (seismic isolation device)

Claims (2)

[Claims] 1. A joint structure of a steel reinforced concrete column and a seismic isolation device, comprising a shaft member protruding at a predetermined position of a base plate, and a penetrating hole through which the shaft member is fixed at a predetermined position of the lower end surface of the steel frame column. A plurality of plate bodies provided with holes; and a fixing member engaged with the shaft member so as to be vertically movable to support the plate body penetrating the shaft member at a predetermined height apart from the base plate. Bonded structure. 2. A method for joining a steel reinforced concrete column and a seismic isolation device, wherein a base plate having a plurality of shaft members protruding at predetermined locations is placed on the seismic isolation device, and a fixing member is provided on the seismic isolation device. A plurality of plate bodies having through holes that are fixed at predetermined locations on the lower end surface of the steel frame are engaged with each other so that they can move up and down, and each plate body is supported by each fixing member. By doing so, the steel frame is erected, and by vertically moving each of the fixing members, it is possible to finely adjust the erection angle and height of the steel frame.