JPH01287355A - Precast steel tubular concrete column structure and its construction - Google Patents

Abstract

PURPOSE:To prevent the deterioration of concrete lined on the connection by welding heat by a method in which a beam and a connector are beforehand welded to the connection of steel tubes. CONSTITUTION:A bracket 3 is welded to the outside of the connection of steel tubes 1, and a distribution plate 4 is welded to the inside. The steel tube 1 with the bracket 3 is set on a centrifuge, and under a condition that concrete 5 is put in the steel tube, the centrifuge is operated to turn the tube 1 in order to produce a precast steel tubular concrete 1a in which the inside of the tube 1 is lined with concrete 5. After the steel tubular concrete 1a with the concrete 5 is set as a column on a given place of construction site, a beam 2 is connected to the bracket 3 of the concrete 1a by bolts, etc.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention relates to a precast steel pipe concrete column in which precast steel pipe concrete, which is manufactured by centrifugally forming concrete on the inner surface of a steel pipe, is assembled into a column or the like on site. It concerns the structure and its construction method.

"Prior Art" As a conventional precast steel pipe concrete structure of this type, a pile structure using precast steel pipe concrete is known.

The conventional method of constructing a precast steel pipe concrete structure is to first set a steel pipe in a centrifuge at a factory, and rotate the steel pipe with the centrifuge with concrete placed inside the steel pipe. Precast steel pipe concrete is manufactured by lining the inner peripheral surface of the steel pipe with concrete of uniform thickness. The precast steel pipe concrete manufactured as described above is then erected underground by a pouring method or the like to form a precast steel pipe concrete structural structure.

``Problem to be Solved by the Invention'' However, in the conventional precast steel pipe concrete structure, since the inner peripheral surface of the steel pipe pile is lined with concrete, it is difficult to form a joint in the steel pipe pile on site. When trying to weld a beam etc. there,
The steel pipes near the joint will be heated by the welding heat, but this welding heat will be transmitted to the concrete in the joint, and there is a risk that the concrete in the joint, which is extremely important for the lining structure, will deteriorate. Ta.

The present invention has been made in view of the above problems, and even when connecting beams etc. to steel pipes lined with concrete (precast steel pipe concrete), the concrete inside the joint is not deteriorated by welding heat. Another object of the present invention is to provide a precast steel pipe concrete column structure and its construction method that can efficiently connect beams and the like at a construction site and shorten the construction period.

"Means for Solving the Problem" In order to achieve the above-mentioned object, the present invention has a connecting member to the beam fixed to the joint part of the steel pipe in advance, and a centrifugal force applied to the inner peripheral surface of the steel pipe. The concrete is lined with tubular concrete, and a beam is connected to the connecting member.

Further, the concrete-lined steel pipe may have a structure in which cast-in-place concrete is placed inside the concrete-lined steel pipe.

Then, in the method of the present invention, after a connecting member with a beam is fixed in advance to the joint part of a steel pipe, concrete is formed on the inner circumferential surface of the steel pipe by centrifugal force to obtain precast steel pipe concrete, and then, the precast steel pipe is After the concrete is erected at a predetermined location on the site, the beam is connected to the connection member of the precast steel pipe concrete.

Furthermore, the inside of the precast steel pipe concrete may be filled with concrete.

"Function" In the present invention, since the connecting member to the beam is welded and fixed in advance to the joint part of the precast steel pipe concrete column, even when the beam is welded and connected to the precast steel pipe concrete column, the inside of the steel pipe is High welding heat will not be transmitted to the concrete, and the concrete lining the joint will not deteriorate.

"Embodiment" Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 to 5 show an embodiment of the method for constructing a precast steel pipe concrete column structure of the present invention.

FIG. 1 shows a cross-sectional view of a precast steel pipe concrete column A constructed by the method of the present invention, and reference numeral 1 indicates a steel pipe. Steel pipe! A bracket (connection member) 3 to be connected to the beam 2 is welded and fixed to a joint portion provided at a predetermined location of the bracket 3, and flanges 3a, 3 of the bracket 3
A bearing plate 4.
4 is fixed. The inner circumferential surface of the steel pipe 1 is lined with concrete 5 of a predetermined thickness by centrifugal force forming.

This precast steel pipe concrete column has a structure in which a casing 2 is connected.゛Next, the method for constructing the precast steel pipe concrete column structure of the present invention will be explained along with its operation using FIGS. 2 to 5.

* First, as shown in FIG. 2, the bracket 3 is welded and fixed to the outside of the joint part of the steel pipe 1, and the bearing plate 4 is welded and fixed to the inside.

*Next, as shown in Figure 3, attach the above bracket 3.
The steel pipe l to which etc. are fixed is set in a centrifuge (not shown), and with concrete 5 placed inside the steel pipe,
By operating a centrifuge and rotating the steel pipe l, the inside of the steel pipe l is lined with concrete 5 to produce precast steel pipe concrete la.

At this time, an upper end plate 7 and a lower end plate 8 are installed near both ends of the steel pipe 1.

*Next, as shown in Fig. 4, precast steel pipe concrete 1 is formed by forming concrete 5 by centrifugal force.
After erecting a as a pillar at a predetermined location on site, the beam 2 is connected to the bracket 3 of the precast steel pipe concrete 1a by bolting or the like. Furthermore, if necessary,
After connecting the precast steel pipe concrete 1a to the upper part so as to have a predetermined floor height, as shown in FIG. 5, the inside may be filled with concrete 6 using a tremie pipe 9.

In this way, in the precast steel pipe concrete column structure and its construction method of this embodiment, after the bracket 3 is fixed in advance to the joint part of the steel pipe l, the concrete 5 is applied to the inner peripheral surface of the steel pipe l by centrifugal force. Since it is formed into a precast steel pipe concrete column 1a, and the casing 2 is connected and fixed to the precast steel pipe concrete column 1a,
Even when welding the bracket 3, high welding heat is not transmitted to the concrete 5 in the steel pipe l at the joint part, which is subject to complex stress, and the concrete 5 at the joint part lined.
will not deteriorate. Moreover, the beam 2 can be efficiently connected to the precast steel pipe concrete la with bolts, and the construction period can be shortened.

And the steel pipes being built! , 1. When concrete is placed inside the concrete lining 5, air will not remain inside the concrete lining 5 and no cavities will be formed or bleeding cement paste etc. will remain.
Precast steel pipe concrete (1a) is filled with concrete 6 densely and with high quality. As a result, it is possible to shorten the construction period and realize a high-quality precast steel pipe concrete column structure.

In the embodiment of the present invention, if the inner surface of the steel pipe is unbonded, it can be used as an unbonded precast steel pipe concrete column structure. At that time, as shown in FIG.
11 may be provided for reinforcement.

"Effects of the Invention" As explained above, the precast steel pipe concrete column structure and its construction method of the present invention are such that the connecting member to the beam is fixed in advance to the joint part of the steel pipe, and then the inner circumferential surface of the steel pipe is fixed. Since the concrete is formed into a precast steel pipe concrete column using centrifugal force, when a beam is welded to the precast steel pipe concrete column, high welding heat is not transmitted to the concrete inside the steel pipe, and the concrete does not deteriorate. In addition, the beam can be efficiently connected to the connecting member, and the construction period can be shortened and a high-quality precast steel pipe concrete column structure can be realized.

[Brief explanation of the drawing]

Figures 1 to 5 show a first embodiment of the present invention. Figure 1 is a cross-sectional view of a precast steel pipe concrete column of the present invention, and Figure 2 is a state in which a connecting member is fixed to a joint part. Figure 3 is a side sectional view of a precast steel pipe concrete column, Figure 4 is a side sectional view of a precast steel pipe concrete column in the erected state, and Figure 5 is a side sectional view of a precast steel pipe concrete column with concrete poured inside. FIG. 6 is a side sectional view showing the deformation absorbing portion of the unbonded precast steel pipe concrete column. A... Precast steel pipe concrete column, 1.
... Steel pipe, LA ... Precast steel pipe concrete column, 2 ... Beam, 3 ... Bracket (connection member), 5 ... Lining concrete (Concrete), 6... Filled concrete (Concrete). Outsourcer Shimizu Construction Co., Ltd.

Claims (1)

[Claims] 1. A connecting member to the beam is fixed in advance to the joint part of the steel pipe, and the inner peripheral surface of the steel pipe is lined with concrete formed into a cylinder shape by centrifugal force. . A precast steel pipe concrete column structure, wherein a beam is connected to the connecting member. 2. A connecting member to the beam is fixed in advance to the joint part of the steel pipe, and the inner peripheral surface of the steel pipe is lined with concrete formed into a cylindrical shape by centrifugal force. A precast steel pipe concrete column structure, characterized in that beams are connected and cast-in-place concrete is placed inside the concrete lining. 3. After fixing the connection member with the beam to the joint part of the steel pipe in advance, concrete is formed on the inner circumferential surface of the steel pipe by centrifugal force to obtain precast steel pipe concrete, and then the precast steel pipe concrete is molded to the specified size on site. A method for constructing a precast steel pipe concrete column structure, which comprises connecting a beam to the precast steel pipe concrete connection member after the structure is erected at a site. 4. After fixing the connection member with the beam to the joint part of the steel pipe in advance, concrete is formed on the inner circumferential surface of the steel pipe by centrifugal force to obtain precast steel pipe concrete, and then the precast steel pipe concrete is molded into the specified shape on site. A method for constructing a precast steel pipe concrete column structure, which comprises connecting a beam to the connection member of the precast steel pipe concrete and filling the inside of the precast steel pipe concrete with concrete after it is erected at a site.