JPH04323445A - Structure of joint part of concrete filling steel pipe column and flat slab - Google Patents

Abstract

PURPOSE:To heighten reliability of yield strength of a concrete filling steel pipe column as concrete filling property is favourable, and to simplify construction as installation construction does not especially use any complicated member for a stress transmission means between the concrete filling steel pipe column and a slab. CONSTITUTION:A reinforcing steel built-up body 8 for a flat slab is arranged on the side of an upper face of an upper connector flange 2 of a steel pipe 1 to constitute a column on the lower step side. A flat slab 12 on the upper step side and a concrete filling steel pipe column 6 are made by inserting an anchor bolt 9 into the reinforcing steel built-up body 8 from a vertical hole 4 of the upper connector flange 2 and sepositing concrete 11 in a formwork 10 to mould the flat slab and the steel pipe 1 in such a way to bury the reinforcing steel built-up body 8. The upper end part of the anchor bolt 9 protruded from the flat slab 12 on the upper step side is inserted into a vertical hole 5 of a lower connector flange 3 of the steel pipe 1 to constitute a column on the upper step side, the steel pipe 1 on the upper step side is built up to the flat slab 12 on the upper step side, and it is tightened and fastened by a nut 13 screwed on the anchor bolt 9.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a joint between a flat slab and each concrete-filled steel pipe column in a building in which concrete-filled steel pipe columns are divided into floors.

0002

BACKGROUND OF THE INVENTION Buildings are already known in which concrete-filled steel pipe columns are used in the form of columns extending over upper and lower floors.

The yield strength of this concrete-filled steel pipe column is greatly influenced by the filling properties of the concrete in the steel pipe, but unlike concrete-coated steel pipe columns, the concrete filling condition cannot be checked over the entire length of the concrete-filled steel pipe column. It is difficult to visually check the concrete-filled steel pipe columns, and this difficulty increases even more when long steel pipes are used as the through-pillars. Therefore, it is not easy to increase the reliability of the bearing strength of concrete-filled steel pipe columns.

[0004] Furthermore, in the column-beam joints of this type of building, a stiffener ring is welded to the outside wall of the steel pipe in the middle of the steel pipe in order to transmit stress between the concrete-filled steel pipe column and the steel beam flange. Accurately attaching the ring to a predetermined position requires considerable skill and effort.

[0005]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to easily increase the reliability of the bearing strength of a concrete-filled steel pipe column, and to improve the reliability of the bearing strength of a concrete-filled steel pipe column because the concrete fills the steel pipe well. To provide a structure of a joint between a concrete-filled steel pipe column and a flat slab, which simplifies construction because members such as the stiffener ring, which are difficult to install, are not used as stress transmission means.

[0006]

[Means for Solving the Problems] In the structure of the present invention, vertical holes 4 and 5 are made to correspond to horizontal connector flanges 2 and 3 on the outer periphery of the upper and lower ends. Using the steel pipe 1 provided as a column-forming steel pipe, a flat slab reinforcing bar assembly 8 is placed on the upper surface side of the upper connector flange 2 of the column-forming steel pipe 1 on the lower floor, and the vertical hole of the upper connector flange 2 is 4, insert the anchor bolts 9 into the reinforcing bar assembly 8, and pour concrete 11 into the flat slab molding form 10 and the steel pipe 1 so as to embed the reinforcing bar assembly 8, and form the flat slab on the upper floor side. 12 and concrete-filled steel pipe columns 6 on the lower floor side.

The upper end of the anchor bolt 9 protruding from the flat slab 12 on the upper floor side is inserted into the vertical hole 5 of the lower connector flange 3 of the steel pipe 1 for forming the column on the upper floor side. A steel pipe 1 is erected on a flat slab 12 on the upper floor side and fixed by tightening with a nut 13 screwed onto an anchor bolt 9.

[0008]

[Operation] Concrete 11 is not poured into the column-forming steel pipe 1 on the lower floor side and the column-forming steel pipe 1 on the upper floor side at the same time, but the concrete 11 is poured onto the column-forming steel pipe 1 on the lower floor side first. be done.

Concrete 11 is poured onto the steel pipes 1 for forming columns on the lower floor by inserting anchor bolts 9 into the reinforcing bar assembly 8 through the vertical holes 4 of the upper connector flange 2 so that the upper end of the anchor bolts are inserted into the reinforcing bar assembly 8. While holding it in a position protruding from the top side,
This is done together with pouring into the formwork 10 for forming a flat slab. Concrete 11 passes through the gaps in reinforcing bar assembly 8 and is filled into column-forming steel pipes 1.

The steel pipes 1 for forming columns on the upper floor side are replaced with concrete-filled steel pipes on the lower floor side when the concrete-filled steel pipe columns 6 on the lower floor side and the filling concrete 11 of the flat slab 12 on the upper floor side are sufficiently hardened. It is built on the upper surface of the flat slab 12 which is an extension of the column 6, and the concrete-filled steel pipe column 6 on the lower floor and the column-forming steel pipe 1 on the upper floor are connected to the vertical holes 4 and 5 of the upper and lower connector flanges 2 and 3. It is rigidly joined via the flat slab 12 on the upper floor side by anchor bolts 9 and nuts 13 that pass through.

A reinforcing bar assembly 8 for the flat slab on the upper floor side is further arranged on the upper surface side of the upper connector flange 2 of the steel pipe 1 for forming columns on the upper floor side. Anchor bolts 9 are inserted into reinforcing bar assembly 8 . Thereafter, by sequentially repeating each of the above steps, a building having the desired number of floors is constructed.

0012

[Embodiment] In the illustrated embodiment, a circular steel pipe is used as the column forming steel pipe 1, and both the upper connector flange 2 and the lower connector flange 3 are composed of circular ring plates, and are welded to the end face of the steel pipe body. . Each connector flange 2
, 3 are provided with eight vertical holes 4, 5 at 45 degree intervals. Note that a square steel pipe can also be used as the column-forming steel pipe 1, and the planar shape of each of the upper and lower connector flanges 2, 3 can also be changed in accordance with the steel pipe body.

[0013]

Effects of the Invention As described above, in the present invention, the column-forming steel pipe 1 is used completely divided between the lower floor side and the upper floor side, and the length of the column-forming steel pipe 1 is determined by the length of the column-forming steel pipe 1. Since the height is approximately the same as that of one floor, compared to the conventional concrete-filled steel pipe column used as a through-column extending over the upper and lower floors, the concrete 11 placed on the column-forming steel pipe 1 is This results in good properties, and the reliability of the yield strength can be reliably increased in both the concrete-filled steel pipe columns 6 on the lower floor side and the concrete-filled steel pipe columns 7 on the upper floor side.

[0014] Also, the concrete-filled steel pipe column 6 on the lower floor side
The concrete-filled steel pipe column 7 on the upper floor side is firmly fixed with the anchor bolt 9 and nut 13 with the flat slab 12 on the upper floor sandwiched between the upper and lower connector flanges 2 and 3. Concrete-filled steel pipe columns 6, 7
Good stress transmission is achieved between the flat slab 12 and the flat slab 12.

[0015] The connector flanges 2 and 3 are the steel pipes 1 for forming the column.
Since the stiffener rings are fixed to the upper and lower ends of the steel pipe, unlike conventional stiffener rings that are welded to the outer wall in the middle of the steel pipe, the structural members of the stress transmitting means can be easily installed.

When constructing the flat slab 12 on the upper floor, the steel pipes 6 for forming columns on the lower floor are tightened and fixed to the flat slab 12 on the lower floor.
By effectively utilizing this as part of the shoring of the formwork 10 for forming a flat slab on the upper floor side, the location and labor of shoring can be saved, and construction costs can be reduced.

[0017] In addition to the shortening of the length dimension of the column-constituting steel pipes 1, the filling properties of the concrete 11 are further improved because no reinforcing bars are provided inside the column-constituting steel pipes 1, 1. Coupled with the restraint effect of the concrete by the steel pipe wall, the diameter of the column-forming steel pipe 1 can be reduced without adversely affecting the load-bearing strength. It will increase it.

[Brief explanation of drawings]

FIG. 1 is an elevational view showing a joint between a concrete-filled steel pipe column and a flat slab according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG. 1;

[Explanation of symbols]

1 Steel pipe for column construction 2 Connector flange 3 Connector flange 4 Vertical hole 5 Vertical hole 6 Concrete filled steel pipe column 7 Concrete filled steel pipe column 8 Rebar assembly for flat slab 9 Anchor bolt 10　Flat slab molding formwork 11 Concrete 12 Flat slab 13 Nut

Claims (1)

[Claims] Claim 1: A steel pipe 1 in which horizontal connector flanges 2 and 3 on the outer periphery of the upper and lower ends are provided with vertical holes 4 and 5 in correspondence with each other is used as a steel pipe for forming a column, and a steel pipe 1 for forming a column on the lower floor side is A flat slab reinforcing bar assembly 8 is placed on the top side of the connector flange 2, and the anchor bolts 9 are inserted into the reinforcing bar assembly 8 through the vertical holes 4 of the upper connector flange 2, and the flat slab is inserted so that the reinforcing bar assembly 8 is embedded. Formwork 10 for slab molding
Concrete 11 is poured into the steel pipe 1 to create a flat slab 12 on the upper floor side and a concrete-filled steel pipe column 6 on the lower floor side, and the upper end of the anchor bolt 9 protrudes from the flat slab 12 on the upper floor side. The steel pipe 1 for the column structure on the upper floor side
The steel pipe 1 on the upper floor side is inserted into the vertical hole 5 of the lower connector flange 3 of the upper floor side, and the steel pipe 1 on the upper floor side is erected on the flat slab 12 on the upper floor side, and the concrete filling is made by tightening and fixing it with nuts 13 screwed into anchor bolts 9. Structure of joint between steel pipe column and flat slab.