JPH0489937A - Column/beam joint structure for steel pipe concrete column reinforced with x-bars - Google Patents

Abstract

PURPOSE:To enhance the easiness in executing works by coupling an upper and a lower steel pipe concrete pillar furnished with bars in X, Y arrangement with a joint unit made of steel by a nut and a threaded part of each bar end. CONSTITUTION:Inside of a steel pipe 5, X-form mild steel bars 6 are arranged in the condition that the threaded parts 6a, 6b at the top and bottom of the bars 6 protrude upward and downward of the steel pipe 5, and concrete 7 is placed therein so as to form a concrete pillar 1 furnished with X-form bar arrangement. An upper and a lower flange 9a, 9b are welded W to the top and bottom of a hollow steel pipe 8 of smaller dia. than the steel pipe 5, and a vertical web 10 is welded W to these flanges 9a, 9b and steel pipe 8 so as to form a joint unit 3. This unit 3 is placed on the top of the pillar 1, and another pillar 1 is put on the unit 3, and the threaded part 6a of the lower pillar 1 is inserted in a through hole 11 in the flange 9b, followed by fastening by a nut 13. The threaded part 6b of the upper pillar 1 is inserted into a through hole 11 in the other flange 9a followed by fastening by nut 13.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in the structure of a column-beam joint of a steel pipe concrete column with built-in X-shaped reinforcement.

[Conventional technology]

The present inventor proposed a structure of a column-beam joint of a steel pipe concrete column with built-in X-shaped reinforcement as shown in Figs. has already been proposed. This consists of a steel outer cylinder 70 and a pair of upper and lower steel inner cylinders 71 fixed to the inner sides of both upper and lower ends of the steel outer cylinder 70, respectively.
a, 71b, and the upper and lower inner cylinders 71a.

The inner cylinders 71a and 71b are placed on the steel pipe 73 with built-in X-shaped reinforcement, which is made up of
A joint steel pipe unit 76 consisting of a steel cylinder 74 having an inner diameter substantially equal to the outer diameter of the cylinder and a beam joint plate 75 protruding outward from the cylinder 74 is connected to
The upper end of the outer cylinder 70 and the lower end of the cylindrical body 74 are welded W, and above the joint steel pipe unit 76,
Steel pipe with built-in X-shaped reinforcement 7 similar to the steel pipe with built-in X-shaped reinforcement 73
3, the lower inner cylinder 7 of the X-shaped reinforcement built-in steel pipe 73
The lower end of the outer cylinder 70 and the cylinder 74 are disposed such that the portion protruding from the lower end of the outer cylinder 70 of 1b is fitted into the cylinder 74.
Welded the upper ends of these X-shaped reinforced steel pipes 73.7
3 and concrete 77 is placed inside the joint steel pipe unit 76. 78 is a hoop reinforcement for concrete restraint.

[Problem to be solved by the invention]

In the above conventional example, the inside of the column steel pipe (outer cylinder 70) with a long buckling length is reinforced with concrete with built-in X-shaped reinforcement.
Although it was very good in terms of strength, there was room for improvement in the following points. That is, in the above structure, welding work is required, and in addition, concrete 77 is poured up to the middle level in the vertical direction of the cylindrical body 74 of the joint steel pipe unit 76, and the steel pipe 73 with built-in X-shaped reinforcement is joined above. After, concrete 7
Since concrete pouring work is required at high places, such as concrete pouring, construction workability has been poor compared to pure steel buildings.

The present invention provides a structure of a column-beam joint of a steel pipe concrete column with built-in X-shaped reinforcement, which is improved in this respect.

[Means to solve the problem]

The technical means taken by the present invention to achieve the above object are as follows. That is, in the structure of the column-beam joint of a steel pipe concrete column with built-in X-shaped reinforcement according to the present invention, reinforcing bars with X-shaped reinforcement are formed inside the steel pipe at the upper and lower ends of each reinforcing bar. A hollow steel pipe with a diameter smaller than that of the steel pipe and a hollow steel pipe with a diameter smaller than that of the steel pipe on both upper and lower ends are installed on a steel pipe concrete column with built-in Fixed top.

It has a lower flange, and a vertical web fixed across the upper and lower flanges and the hollow steel pipe, and the upper and lower flanges are provided with a plurality of through holes corresponding to the screw shaft portions. A steel joint unit is placed, and a steel pipe concrete column with built-in X-shaped reinforcement similar to the above-mentioned M cable pipe concrete column with X-shaped reinforcement is placed above the joint unit, and a steel pipe concrete column with built-in X-shaped reinforcement is placed on top of the joint unit. Insert the upper screw shaft of the steel pipe concrete column into the through hole of the lower flange and tighten the nut, and insert the lower screw shaft of the upper steel pipe concrete column with built-in X-shaped reinforcement into the through hole of the upper flange. It is characterized by a nut tightening.

[Effect]

According to the above configuration, the upper and lower X-shaped steel pipe concrete columns with built-in reinforcement are connected to the steel joint unit via the threaded shaft part of the reinforcing bar end and the NAND. Even if concrete is poured and prefabricated steel pipe concrete columns with built-in X-shaped reinforcement are made, connection is possible, and there is no need for concrete pouring work at high places or welding work at the column-beam joints.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIGS. 3 and 4 show a structure (mega-structure) in which a truss structure and a rigid frame structure are synthesized. l is X
Steel pipe concrete column with built-in reinforcement, 2 is a steel beam, 3 is a steel joint unit, 4a is a diagonal member for a truss structure, 4
b is a horizontal member.

The structure of the column-beam joint of the steel pipe concrete column 1 with built-in X-shaped reinforcement is as follows.

That is, the steel pipe concrete column 1 with built-in X-shaped reinforcement
As shown in FIGS. 2 and 2, reinforcing bars 6 arranged in an X-shape are formed inside the steel pipe 5 at both upper and lower ends of each reinforcing bar 6. 6b... is the steel pipe 5
It is provided in a vertically protruding state above and below the steel pipe 5, and is constructed by pouring concrete 7 inside the steel pipe 5. Concrete 7 is placed on the ground in advance.

As shown in FIGS. 1, 2, and 5, the joint unit 3 includes upper and lower flanges 9a and 9b fixed by welding W to both upper and lower ends of a hollow steel pipe 8 having a diameter smaller than that of the steel pipe 5. death,
A vertical web 10 is fixed by welding W across the upper and lower flanges 9a and 9b and the hollow steel pipe 8, and
The screw shaft portions 6a are attached to the lower flanges 9a and 9b.
6b... is formed by drilling a plurality of through holes 11... corresponding to the vertical webs 11, and the tip side of the vertical web IO is
Bolt insertion holes 12 for connecting the above-mentioned beam steel frame 2, diagonal members 4a, horizontal members 4b, etc. are drilled, and ports for connecting the steel beams 2 are provided on the tip sides of the upper and lower flanges 9a and 9b. Insertion holes 12... are bored.

Then, as shown in FIGS. 1 and 2, the joint unit 3 is placed on the steel pipe concrete column l with built-in X-shaped reinforcement, and the joint unit 3 is placed on top of the joint unit 3. A steel pipe concrete column 1 with built-in X-shaped reinforcement similar to the steel pipe concrete column 1 is arranged, and the upper screw shaft portion 6a of the lower X-shaped reinforced steel pipe concrete column 1 is connected to the through hole 11 of the lower flange 9b. ...Insert it into Natsu 13...
Then, the lower screw shaft portions 6b of the upper X-shaped reinforcement built-in steel pipe concrete column l are inserted into the through holes 11 of the upper flange 9a, and the nuts 13 are tightened. Hoop reinforcements 14 for restraining the concrete 7 are wound around the outer periphery of the reinforcing bars 6 arranged in an X-shape, but these hoop reinforcements 14 may be omitted.

In addition, the number and arrangement interval of the reinforcing bars 6 for X-shaped reinforcement can be set as appropriate. In the illustrated example, eight reinforcing bars 6...
is used, and by tilting the four reinforcing bars 6, placed every other in the circumferential direction in the same direction, and tilting the remaining four in the opposite direction, an X-shape is formed when viewed from the side. Reinforcement is arranged to show the appearance. Reinforcing bars 6... When using round steel or ordinary deformed reinforcing bars, screw shaft portions 6a..., 6
b... is formed by threading both ends of the reinforcing bar 6..., but when the reinforcing bar 6... is closed and a threaded reinforcing bar is used, the threaded joint is the same as the nut 13... It will be used as a male thread for screwing.

The manufacturing method of the steel pipe concrete column 1 with built-in X-shaped reinforcement is as follows.

As shown in FIG. 6(a), a reinforcing bar end assembly 6A in which a required number of reinforcing bars 6 are arranged in an X shape and the above-mentioned joint unit 3 are produced in a factory. 15a and 15b are reinforcing bars 6...
Wrapped around the outer periphery of both ends are a pair of ring plates fixedly attached. The outer diameters of the ring plates H5a and 15b are set slightly smaller than the inner diameter of the steel pipe 5 so that they can be easily inserted into the steel pipe 5. A part of the brakes 15a and 15b in the circumferential direction may be separated so that they can be reduced and deformed.

Rebar tip assembly 6 is installed in a work yard set up on the premises of a construction site.
A, the joint unit 3, steel pipe 5, etc. are brought in, and in the work yard, as shown in Figure 6 (b), one end of the reinforcing bar 6 in the reinforcing bar end assembly 6A is placed under the joint unit 3. Attach flange 9b (or upper flange 9a) to 13...
・After that, as shown in FIG. 6(c), the steel pipe 5 is fitted around the outer periphery of the steel pipe 5. Although not shown, the steel pipe 5 is fitted around the outer periphery of the reinforcing bar end assembly 6A in advance. It may also be carried into a work yard.

Next, as shown in FIG. 6(d), concrete 7 is placed inside the steel pipe 5. In this case, in order to obtain dense concrete, it is desirable to press the concrete 7 into the steel pipe 5 from below using the pipe 16.

After pouring concrete 7, after the required curing period, the 6th concrete
As shown in Figure (E), an X-shaped reinforced steel pipe concrete column 1 with a joint unit 3 fixed to one end is manufactured. This is then lifted up with a crane etc. and connected, and the first
The structure shown in FIG. 2 is used.

In the embodiment shown in FIG. 2, the steel pipe 5 is welded to the lower flange 9b.
However, as shown in FIG. 7, caulking 17 may be applied between the steel pipe 5 and the lower flange 9b (or upper flange 9a) without welding them together.

With this configuration, the axial force (vertical load) is borne by the concrete 7, and the axial force (vertical load) is not applied to the steel pipe 5, so that a thin-walled steel pipe 5 can be used.

〔Effect of the invention〕

The structure of the column-beam joint of the steel pipe concrete column with built-in Even if the structure is prefabricated, it is possible to connect the columns and beams, eliminating the need for concrete pouring at high places or welding at beam and column joints, significantly improving workability.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view of the column-beam joint, FIG. 2 is a longitudinal side view of the main part, FIG. 3 is a schematic side view showing the bridge of the entire building, and FIG. 4 is a schematic perspective view of the main parts of the frame, FIG. 5 is a perspective view of the joint unit, and FIGS.
(E) is an explanatory diagram of a method for manufacturing a steel pipe concrete column with built-in X-shaped reinforcement. FIG. 7 is a sectional view of a main part showing another embodiment of the present invention. FIGS. 8 and 9 are explanatory diagrams of conventional examples. 1... Steel pipe concrete column with built-in X-shaped reinforcement, 3... Joint unit, 5... Steel pipe, 6... Rebar, 6a,
6b...Screw shaft portion, 7...Concrete, 8...
Hollow steel pipe, 9a... Upper flange, 9b... Lower flange, 10... Vertical web, 13... Nut.

Claims (1)

[Claims] Inside the steel pipe, reinforcing bars arranged in an X-shape are provided with screw shafts formed at both the upper and lower ends of each reinforcing bar protruding vertically above and below the steel pipe, and concrete is poured inside the steel pipe. A hollow steel pipe with a smaller diameter than the steel pipe, upper and lower flanges fixed to both upper and lower ends of the hollow steel pipe, and fixed across the upper and lower flanges and the hollow steel pipe are mounted on a concrete column with a built-in X-shaped reinforced steel pipe. a vertical web, and
A steel joint unit is arranged in which a plurality of through holes corresponding to the screw shafts are bored in the upper and lower flanges, and the steel pipe concrete column with built-in X-shaped reinforcement is placed on top of the joint unit. A similar steel pipe concrete column with built-in X-type reinforcement is arranged, and the upper screw shaft of the lower steel pipe concrete column with built-in A structure of a column-beam joint of an X-shaped steel pipe concrete column with built-in reinforcement, characterized in that the lower screw shaft of the steel pipe concrete column with built-in reinforcement is inserted into the through hole of the upper flange and tightened with a nut.