JPH0220765A - Construction method for square stressed concrete pole - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of constructing a square SC column (a composite column of a square steel pipe and concrete).

[Prior Art] Many steel-framed reinforced concrete (SRC) columns have been used in the past as earthquake-resistant and fire-resistant structures, but the construction was complicated as it involved form work and reinforcing work.

Therefore, recently, attempts have been made to use SC columns that do not require formwork work.

[Problem to be Solved] However, in the case of a rectangular SC column with a large column diameter of several tens of meters in height, there is a problem that the steel pipe skin plate bulges due to the internal pressure of the concrete due to the press-in and filling of concrete.

When the skin plate swells, the column's ability to bear the axial force is significantly reduced, so some kind of solution is required.

[Means for Solving the Problems] The method of constructing a square SC column of the present invention is to provide a stiffening frame on the outside of the square steel pipe to be erected to prevent the steel pipe skin plate from bulging out, and to fill it with concrete. After solidification, the stiffening frame is removed.

[Operation] Since the stiffening frame is provided on the outside of the square steel pipe, it is possible to prevent the skin plate from bulging out due to the internal pressure of the concrete, and to prevent a decrease in the axial force bearing capacity.

[Example] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

A stiffening frame 2 is placed on the outside of the square steel pipe 1, filled with concrete 1~
They are provided at a required pitch p corresponding to the internal pressure of.

In this state, concrete is press-fitted or filled into the square steel pipe 1. In this case, even if the internal pressure of the concrete acts on the skin plate, the skin plate will not bulge out because the stiffening frame 2 prevents the skin plate from bulging out.

After the pressed-in and filled concrete has solidified, the reinforcing frame 2 is removed for fireproof coating and finishing work.

In this way, it is possible to erect an SC column in which the steel pipe and concrete are integrated.

Note that it is desirable that the stiffening frame 2 has a structure that is easy to attach and detach. An example is shown in Figure 3.4.

This is composed of a pair of frame members 12 arranged opposite to each other. The frame member 12 is a member 3 having a threaded portion 14 at its tip.
and a member 15 having a long hole 16 on the side surface of the tip.
It is composed of 7 connected parts. These one set of frame members 12
are arranged facing the outside of the steel pipe, and each threaded portion 14
Attach the stiffening frame by inserting it into the long hole roller on the other side and screwing the nut onto the threaded part. In this case, it is desirable to provide anti-slip notches around the elongated hole 16 in order to prevent the members from shifting when filling with concrete. After the filled concrete has solidified, it can be easily removed by removing the nuts.

[Effect] The construction method of the rectangular SC column of this invention is as described above,
A simple method to prevent skin plate swelling,
It is possible to prevent a decrease in the axial force bearing capacity of the column.

[Brief explanation of the drawing]

1 and 2 are a plan view and a side view of the stiffening frame installed, and FIGS. 3 and 4 are a plan view and a side view of an example of the stiffening frame. 1... Square steel pipe 2... Stiffening frame Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 3 Figure 4 Figure 2

Claims (1)

[Claims] A square SC column characterized in that a stiffening frame is provided on the outside of the square steel pipe to be erected to prevent the steel pipe skin plate from bulging out, and the stiffening frame is removed after filling and solidifying concrete. Construction method.