JPH05280093A - Steelwork joint construction for building - Google Patents

Abstract

PURPOSE:To provide the steelwork joint construction of a building by which the execution can be performed even by a worker having not so high expertise, the labor cost can be curtailed, and the construction period can be shortened. CONSTITUTION:Respective terminal end parts 2 of two steelworks 1 made of steel plate as objects to be joined are surrounded with sleeves 3, and spaces between the outer faces of the terminal end parts 2 of respective steelworks and the inner faces of the sleeves are filled with grout material poured therein. The projecting parts or the recessed parts on the outer faces of terminal end parts 2 of the respective steelworks and the projecting parts or the recessed parts on the inner faces of the sleeves are engaged with the hardened grout material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel frame joint structure in a structure having a steel frame structure or a steel frame reinforced concrete structure.

[0002]

2. Description of the Related Art In order to obtain a joint between steel frames at a column-to-column joint or a column-to-beam joint of a building of this type, only a joining method using high-strength bolts or a joining method by welding can be used. And welders had to be placed at the construction site.

However, the serious problem of shortage of skilled workers is no exception in blacksmiths and welders, and in the construction industry, how to deal with rising labor costs and delays in construction period has become a major issue. .

[0004]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a steel joint structure capable of solving the problems of increased labor cost and delayed construction period because it can be performed even by a skilled worker who does not have a particularly high level of specialized technology. It is in.

[0005]

The steel frame joint structure according to the present invention will be described below with reference to the reference numerals in the drawings.
The outer surface 2a of each steel frame end 2, 2 and the sleeve 3
The grout material 4 is injected into the space between the inner surface 3a of the steel frame 3 and the projections 5 or recesses of the outer surface 2a of the steel end 2 and the projections 6 or recesses of the inner surface 3a of the sleeve 3 to form the hardened grout material 4
Bite into.

In another aspect of the present invention, in order to reduce the amount of work at the construction site, the sleeve 3 is pre-fixed to the end portion 2 of one of the steel frames 1 at the factory stage and the other at the construction site. The end portion 2 of the steel frame 1 is inserted through the end opening 7 of the sleeve 3, and the grout material 4 is injected.

Whether the steel frame end portion 2 is formed integrally with the main body portion of the steel frame 1 or is formed separately from the main body portion and joined to the main body portion by welding or the like depends on the sectional shape of the steel frame 1 and the like. It can be selected as appropriate. For convenience of processing for forming the projections 5 and the like on the steel end portion 2, it is generally desirable to construct the steel end portion 2 separately from the main body portion.

[0008]

In this joint structure, the grout material 4 adheres to the outer surface 2a of the steel frame end portion 2 and the inner surface 3a of the sleeve 3 over the entire length and width, and the projections 5 on the outer surface 2a of the steel frame end portion 2 and the inner surface 3a of the sleeve 3 are attached. Since the projections 6 are closely meshed with the grout material 4 and the relative displacement of the steel frames 1 and 1 is restrained by the sleeve 3 that surrounds the steel frame end portions 2 and 2, bending stress, shear stress, and axial force are A reliable joint that can be accurately transmitted between the steel frames 1 and 1 through the hardened grout material 4 and can withstand tensile force and compressive force can be obtained.

[0009]

EXAMPLE In the example shown in FIGS. 1 to 6, the structure of the building is such that the precast concrete beam body 9 is joined between the precast concrete pillars 8 which are fixedly erected on the foundation, A precast concrete floor body is joined between the concrete beam bodies 9 and 9 to fill the voids of the column-beam joints and the voids of the beam-floor joints so that a floor slab of a predetermined thickness is formed. The lowest floor is constructed by pouring concrete 10 into the building, and thereafter, by repeating these steps in sequence, the skeleton of the required number of floors is built up.

The steel frame 1 embedded in the central column portion 11 of the concrete column body 8 in the axial direction is composed of a composite of steel plates joined in a cross shape, and is surrounded by spiral rebars 12 over almost the entire length. The steel frame 1 of the sleeve column portion 13 in the front, rear, left and right directions is made of a single steel plate, and the spiral rebar 14 is formed over almost the entire length.
It is surrounded by. The end portion 2 of the central pillar portion 11 on the upper side of the steel frame 1 projects a predetermined length from the upper end surface of the concrete pillar body 8, and a large number of hemispherical protrusions 5 are embossed on the outer surface 2a of the end portion 2 by embossing. Has been formed.

The lower end 2 of the steel frame 1 of the central pillar 11
Is retracted from the lower end surface of the concrete pillar 8 by a predetermined length, and the cross-shaped sleeve 3 made of cast or forged steel and fixed in advance by welding or bolting as shown in FIG. . The end opening 7 of the sleeve 3 is open to the lower end surface of the concrete columnar body 8, and a large number of hemispherical projections 6 are formed on the inner surface 3 a of the sleeve 3. The side wall of the sleeve 3 is provided with a grout material injection hole 15,
A through hole 16 communicating with the injection hole 15 is provided in the central pillar 11.

A steel frame 1 axially embedded in each sleeve post 13
Is made of a single steel plate, and the upper end portion 2 of the steel frame 1 is
Protrudes from the upper end surface of the concrete pillar 8 for a predetermined length, and a large number of hemispherical projections 5 are formed on the outer surface 2a of the steel frame end portion 2.
Are formed by embossing. The lower end portion 2 of the steel frame 1 is retracted from the lower end surface of the concrete column 8 by a predetermined length, and the flat tubular sleeve 3 made of steel cast or forged as shown in FIG. Pre-fixed with bolts. The end opening 7 of the sleeve 3 is opened to the lower end surface of the concrete columnar body 8, and a large number of hemispherical projections 6 are formed on the inner surface 3 a of the sleeve 3. The sleeve post 13 has a through hole 17 communicating with the injection hole 15 of the sleeve 3.

At the upper end of the concrete column body 8, there is embedded a beam-joining steel frame 1 made of a single steel plate having a vertical plate width direction in four directions of front, rear, left and right, as shown in FIG. In addition, each steel frame 1 is a steel frame 1 of a sleeve post 13 and a steel frame 1 of a central post 11
Pre-fixed by welding or bolting. The end portion 2 of each steel frame 1 for beam connection projects from the side surface of the sleeve portion 13 by a predetermined length, and the outer surface 2a of the end portion 2 has a hemispherical projection 5
Are formed by embossing.

The steel frame 1 embedded in the concrete beam body 9 in the axial direction is composed of a single steel plate whose plate width direction is vertical,
It is surrounded by spiral rebar 18 over almost the entire length. The left and right end portions 2 of the steel frame 1 project from the left and right end surfaces of the concrete beam body 9 by a predetermined length, and the outer surface 2a of each end portion 2
The hemispherical projections 5 are formed on the surface by embossing. The sleeve 3 applied to the steel frame 1 of the concrete beam body 9 is a cast or forged steel flat tubular shape, and has end openings 7 on both left and right sides.

The projecting length of the end portion 2 of the steel frame 1 of the concrete beam body 9 is set to be equal to or slightly longer than the axial length of the sleeve 3. The side wall portion of the sleeve 3 is not provided with a grout material injection hole. A large number of hemispherical protrusions 6 are formed on the inner surface 3 a of the sleeve 3. The steel frame 1 of the concrete beam body 9 and the upper part of the spiral reinforcing bar 18 are exposed on the upper surface of the concrete beam body 9, and these exposed portions are struck on the upper surface side of the semi-precast concrete floor body as shown in FIG. It is embedded in the installed concrete 10 together with the truss reinforcement of the concrete floor and the slab top reinforcement.

Concrete beam body 9 on concrete column body 8
At the time of joining, the sleeve 3 is fitted in advance to the end portion 2 of the steel frame 1 of the concrete beam body 9, and the sleeve 3
The outer end surface of is located at the same position as the tip surface of the steel end 2,
The concrete beam 9 is retracted and slid toward the main body side so as to come to a position slightly retracted therefrom. Place the concrete beam body 9 at a predetermined position between the concrete pillar bodies 8 and 8,
After the steel frame 1 of the concrete beam 9 and the beam-joining steel frame 1 of the concrete column 8 are butted, the sleeve 3 is returned to the side of the concrete column 8 and slid.

Concrete beam 9 and concrete column 8
After surrounding the fixed length portions of the end portions 2 and 2 of the respective steel frames 1 and 1 with the sleeve 3, as shown in FIGS. 5 and 6, the grout material 4 is inserted through the end openings 7 on the left and right sides of the sleeve 3. inject. As the grout material 4, a commercially available cement-based non-shrinkable high-strength grout material or the like is appropriately selected and used. By hardening the grout material 4, the steel frame ends 2 and 2 on both sides and the sleeve 3 are integrated.

When the upper concrete pillar 8 is joined to the lower concrete pillar 8, the upper concrete pillar 8 is arranged directly above the lower concrete pillar 8 and is vertically lowered as it is, to thereby lower the concrete pillar 8. The upper end portions 2 of the steel frame 1 of the central column portion 11 of the body 8 and the steel frame 1 of the sleeve column portion 13 are inserted into the sleeves 3 of the lower end portion of the upper concrete column body 8 through the end openings 7. After arranging the upper concrete pillar 8 at a predetermined position and surrounding the predetermined length of each steel frame end portion 2 with each sleeve 3, as shown in FIGS. 3 and 4, the through holes 16, 17 of the concrete pillar 8 are provided. Then, the grout material 4 is injected through the injection hole 15 of each sleeve 3.

By the hardening of the grout material 4, the end portions 2 and 2 of the upper and lower steel frames 1 and 1 are integrated via the sleeve 3. A systematic formwork that can be used repeatedly is provided around the column-beam joints, column-column joints, and beam-floor joints constructed in this way, and fills the voids in each joint. Further, the concrete 10 is poured so that a floor slab having a predetermined thickness is formed.

In the embodiment shown in FIG. 7, in order to increase the adhesion area between the grout material 4 and the steel frame end portion 2 and further increase the joint strength, the groove portion 1 is formed in the steel frame end portion 2 made of steel plate.
9 is provided, and the groove portion 19 is also filled with the grout material 4.
For the same purpose, in the embodiment shown in FIG. 8, the groove portions 19 and the strip plate portions 20 are alternately provided on both steel frame end portions 2 made of steel plates, and the strip plate portion 20 of one steel frame end portion 2 is provided on the other side. It is fitted in the groove portion 19 of the steel frame end portion 2.

In the embodiment shown in FIG. 9, the sleeve 3 is composed of two divided bodies 3A and 3B which are vertically divided, and the divided bodies 3A and 3B are fitted from both front and rear sides of the steel frame end portion 2 made of a steel plate. Then, the through holes 2 of the edge plate portions 21 and 22 that are abutted against each other
The bolts 25 and the nuts 26 passing through 3, 24 are connected and integrated. In this way, the sleeve 3 described above
It is not necessary to set the projecting length of the steel frame end portion 2 to be long for the sliding operation, and it is possible to shorten the casting length of the make-up concrete 10 at the column-beam joint or the like.

In another embodiment of the present invention, the end portions 2 on both the upper and lower sides of the steel frame 1 of the concrete column 8 are projected from the upper and lower end surfaces of the concrete column 8 and the sleeve 3 having the end openings 7 on both the upper and lower sides. Can be slidably fitted to the upper and lower steel frame end portions 2. Further, the left and right end portions 2 of the steel frame 1 of the concrete beam body 9 are retracted from the left and right end surfaces of the concrete beam body 9 by a predetermined length, and the sleeve 3 is fixed to the steel frame end portion 2 and the end portion of the sleeve 3 is fixed. It is also possible to open the opening 7 on one of the left and right end surfaces of the concrete beam 9.

The shape and arrangement of the projections 5 and 6 or the recesses for increasing the adhesion strength between the steel frame end portion 2 and the sleeve 3 and the grout material 4 are not limited to those shown in the drawings, and the projections, grooves and streak lines are not limited thereto. Various shapes such as through holes or cutouts can be adopted, and various arrangement modes such as continuous arrangement, discontinuous arrangement, uniform distribution or nonuniform distribution can be appropriately selected. Further, the projections 5, 6 and the like may not only be integrally formed on the steel frame end portion 2, but a member that meshes with the grout material 4 may be separately formed and fixed to the steel frame end portion 2.

[0024]

As described above, the steel joint structure of the present invention is
The end portions 2 and 2 of the two steel frames 1 and 1 to be joined are surrounded by a sleeve 3, and the outer surface 2a of each steel end portion 2 and the sleeve 3 are surrounded.
The grout material 4 is injected between the inner surface 3a and the inner surface 3a, and the hardened grout material 4 is engaged with the projections 5 on the outer surface 2a of the steel end 2 and the projections 6 on the inner surface 3a of the sleeve 3. Since even skilled workers who do not have technology can be easily and accurately constructed, the problems of labor cost and personnel reservation due to lack of skilled workers are solved, labor saving of the construction work of the building, shortening of construction period and reduction of construction cost Is possible.

[Brief description of drawings]

FIG. 1 is a perspective view of a building adopting a steel joint structure according to an embodiment of the present invention before a pillar and a beam are joined.

FIG. 2 is a front view of the column and the beam after they are joined.

FIG. 3 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 4 is an enlarged sectional view taken along line BB of FIG.

5 is an enlarged cross-sectional view taken along the line CC of FIG.

FIG. 6 is an enlarged cross-sectional view taken along the line DD of FIG.

FIG. 7 is a sectional view of a steel joint structure according to another embodiment of the present invention.

FIG. 8 is a sectional view of a steel joint structure according to still another embodiment of the present invention.

FIG. 9 is a cross-sectional view of a steel frame joint structure according to another embodiment of the present invention.

[Explanation of symbols]

 1 Steel frame to be joined 2 Steel frame end part 3 Sleeve 4 Grout material 5 Outer surface projection of steel frame end part 6 Inner surface projection of sleeve 7 End opening of sleeve 8 Concrete column body 9 Concrete beam body 10 Concrete for floor slab 11 Concrete column body Central column 12 Spiral rebar 13 Cylinder post of concrete column 14 Spiral rebar 15 Grout material injection hole 16 Injection through hole 17 Injection through hole 18 Spiral rebar 19 Groove at end of steel frame 20 Strip plate at end of steel frame 21 Edge plate part 22 Edge plate part 23 Through hole for connection 24 Through hole for connection 25 Bolt 26 Nut

Claims (3)

[Claims] 1. An outer surface of each of the steel frame ends is enclosed by a sleeve surrounding each of the two steel frames to be joined, and a grout material is injected into a space between an outer surface of each of the steel frame ends and an inner surface of the sleeve. Steel joint structure of a building in which the protrusions or recesses of the above and the protrusions or recesses of the inner surface of the sleeve are engaged with the hardened grout material. 2. A sleeve is fixed to an end of one steel frame to be joined, and the other end of the steel frame is inserted through an end opening of the sleeve, and between the outer surface of each steel end and the inner surface of the sleeve. A steel-framed joint structure of a structure in which a grout material is injected into a space, and projections or recesses on the outer surface of each steel frame end portion and projections or recesses on the inner surface of the sleeve are engaged with the hardened grout material. 3. The steel joint structure according to claim 1 or 2, wherein the steel frame is composed of a single steel plate or a composite of steel plates.