JPH01315533A - Precast steel pipe concrete column structure - Google Patents

Abstract

PURPOSE:To make a pole constructible in an efficient manner by installing coupling plates, having a through hole each, in both upper and lower ends of a steel pipe applied with lining concrete, and connecting these coupling plate through a connecting member. CONSTITUTION:Each of beam connection flange-cum-upper coupling plates 8, 8 with each of first through holes 7, 7 is installed in an upper end of a steel pipe 2 provided with lining concrete 3 in its inner circumferential surface, and each of lower coupling plates 11, 11 with second through holes 10, 10 is installed in the lower end. Then, an upper precast steel pipe concrete pole 1 is built in the upper part of another precast steel pipe concrete pole 1 built in the lower part, and then the upper coupling plates 8, 8 and the lower coupling plates 11, 11 are connected together by each connecting member such as bolt and nut or the like. In this connection, when charging concrete is placed in the inner part of each steel pipe 2, at least one side of these through holes 7, 7, and 11, 11 is formed to be smaller in diameter than the inner diameter of each lining concrete 3, making it transfer the axial load to the charging concrete.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a precast steel pipe concrete column structure using precast steel pipe concrete manufactured by centrifugally forming concrete on the inner surface of a steel pipe for building columns. It is something.

"Conventional technology" This type of conventional precast steel pipe concrete column structure has a precast steel pipe concrete lined with concrete of a uniform thickness on the inner circumferential surface of the steel pipe, and the beam connection part is placed at a preset floor height. (brackets) are installed at the joints by welding, and a predetermined number of these precast steel pipe concrete pipes are erected at the construction site, and the upper and lower ends of the steel pipes are connected in the longitudinal direction by welding. It is known that a beam is connected to the joint part of a precast steel pipe concrete column.

``Problems to be Solved by the Invention'' However, in the conventional precast steel pipe concrete column structure, since the inner peripheral surface of the steel pipe column is lined with concrete, it is difficult to install and connect the precast steel pipe concrete. There is a risk that the concrete near both ends of the steel pipe column and the bracket attachment part of the joint section will deteriorate due to welding heat, and the quality control of the welding work on site and the time required for construction are complicated. In addition, welding work cannot be carried out if the weather conditions (temperature, etc.) cannot be satisfied, making it difficult to secure a construction period.In addition, when installing concrete filler, the welding work cannot be carried out if the weather conditions (temperature, etc.) cannot be satisfied. Because the applied load depends only on the adhesion between the concrete directly lining the steel pipe and the concrete, there is a risk that the axial load acting on the steel pipe from the beam may not be reliably transmitted to the concrete filling inside. There were several problems.

The present invention was created in view of the above problems, and it is possible to connect precast steel pipe concrete in the longitudinal direction without deteriorating the internal concrete due to welding heat, and to improve on-site quality control and construction. Eliminate hassle,
It is an object of the present invention to provide a precast steel pipe concrete column structure that can be easily connected and that can reliably transmit the axial load of the steel pipes to the concrete inside.

"Means for Solving the Problems" In order to achieve the above-mentioned object, the present invention provides that lining concrete is formed on the inner circumferential surface of a steel pipe by centrifugal force,
The upper end of the steel pipe is provided with an upper joint plate that also serves as a beam joint flange and has a first through hole formed therein, and the lower end has a second through hole formed in the center and is connected to the upper joint plate. A lower joint plate connected by a member is provided, and the first through hole and the second through hole are formed to have approximately the same diameter as the inner diameter of the lining concrete.

In addition, when filling concrete is provided inside the steel pipe, at least one of the first through hole or the second through hole is formed to have a smaller diameter than the inner diameter of the lining concrete, so that the filling concrete has an axial direction. What is necessary is to transmit the load.

"Function" In the precast A-pipe concrete column structure of the present invention, the upper precast steel pipe concrete is erected on top of the precast steel pipe concrete column erected below, and the upper joint plate provided thereon. Simply connect the lower joint plate with connecting members such as bolts,
Precast steel pipe concrete can be quickly connected to a predetermined floor height. In addition, when installing concrete filler inside a precast steel pipe concrete column,
The upper joint plate or lower joint plate presses the filled concrete formed inside the concrete that is directly lined with the steel pipe, so the axial load acting on the steel pipe from the beam is reliably transmitted to the concrete inside the steel pipe. I can do it.

"Embodiment" Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 to 4 show an embodiment of the precast steel pipe concrete column structure of the present invention.

In the figure, reference numeral 1 denotes a precast steel pipe concrete column having a length equivalent to three stories, and a concrete lining 3 is applied to the inner circumferential surface of the steel pipe 2 of the precast steel pipe concrete column 1 by centrifugal force, and the upper end of the precast steel pipe concrete column 1 is A joint section 4 is formed in the section. The joint part 4 is connected to a beam fixed to the upper end of the steel pipe 2, and is fixed to the upper part of the connection plate 5 with its axis aligned with the axis of the steel pipe 2,
and an outer pipe 6 having an outer diameter larger than that of the steel pipe 2, and a pipe provided in the upper part of the outer pipe 6 in parallel with the connecting plate 5 and having approximately the same diameter as the inner diameter of the concrete lining 3 in the center. 1
It consists of an upper joint plate 8 in which a through hole 7 is formed,
A web 8a is provided between the connecting plate 5 and the upper joint plate 8.

In this embodiment, the connection plate 5 has four directions 9.
9. Connecting portion 5a in a planar cross shape so as to be connected to...
is formed. Further, as shown in FIG. 2, the upper joint plate 8 has each connection q 7 a formed in a planar cross shape like the above-mentioned connection plate 5, and a lower joint plate described later is provided at a predetermined location. A bolt hole for connection with 11 is formed.

The lower end of the steel pipe 1 has a second through hole lO in the center.
is formed and connected to the upper joint plate 8.
i Hand plate II is fixed, and the lower N8 hand plate 11 and the upper joint plate 8 of the joint part 4 of the lower precast steel pipe concrete 1 are connected by a connecting member 13 made of bolts and nuts, and the lower joint plate The plate 5 and the upper joint part 8 are connected to the bolt/nut 1 via the joint plates 14, 14, .
Beam 9.9 due to 5,15°... It has a configuration in which it is connected to...

Next, a method of constructing the precast steel pipe concrete column structure of this embodiment configured as described above will be explained along with its operation.

(+) First, the connection plate 5, outer pipe 6, and upper joint plate 8 are welded to the upper part of the steel pipe 1 in a predetermined shape to form the joint part 4, and the lower joint plate 11 is attached to the lower end of the steel pipe 1. Fix it.

(ii) Next, set the steel pipe l with the joint part 4 formed as described above in a four-core machine (not shown), and operate the centrifuge with the concrete 3 placed inside the steel pipe. By rotating the steel pipe 14, the inside of the steel pipe I is lined with concrete 3 of uniform thickness, and a precast steel pipe concrete column 1 is manufactured.

Before lining the concrete, insert bolts +3.1 from the inside into the bolt holes of the lower joint plate 8 of the joint section 4.
3. ..., and then tighten the bolts 13.13.・・・
・The lower joint plate of the precast steel pipe concrete column that will be built on top of it! Install it so that it will be inserted into the bolt hole of l.

(iii) Next, the precast steel pipe concrete column 1 lined with concrete inside I is erected at the site to a predetermined floor height, and the connecting plate 5 of the joint part 4 of the precast steel pipe concrete column l is constructed. and beams 9.9 to the lower joint plate 8 by a predetermined method. Connect...

(iv) Next, since the precast steel pipe concrete column 1 has a story height equivalent to three stories, there is a beam 9.・・・
・Connect.

Therefore,! 4 In the middle of pipe 2, as shown in Fig. 3,
The joint portion 4 is formed in advance by two parallel connecting plates 5.5 and a steel pipe 6 having a larger diameter than the steel pipe 2 fixed between the connecting plates 5.5. Further, as shown in FIG. 4, connection plates 5, 5. . . may be provided. Note that a web 5a is provided between the connecting plates 5.5.

(v) Next, cast-in-place concrete 12 is placed inside the precast steel pipe concrete 1 configured as described above using a tremie pipe, etc., and after the poured concrete ■2 has hardened? This removes the slag (latance) that occurs at the upper part of the joint part 4 of the precast steel pipe concrete that will be the top of the pouring, and also builds up the mixed membrane 7. The non-shrinkable mortar 16 which has been subjected to f-filling is heaped up and filled in a slightly large volume, and then another precast steel pipe concrete 1 is placed on top of the mortar 16.

Therefore, an extra tonne of the captured mortar 16 flows out into the central circulation hole 10 of the lower joint plate If, and the lower joint part 4 of the precast steel pipe concrete column is filled with high-quality concrete. are densely filled and no voids are created.

Also, when constructing the precast steel pipe concrete ■, insert the bolts 13 protruding from the upper part of the upper joint plate 8 of the lower precast steel pipe concrete into the bolt holes of the lower joint plate 1 of the upper precast steel pipe concrete. This is done by screwing nuts together.

Thereafter, the building is constructed by repeating steps (iii) to (V) above.

In this way, the precast steel pipe concrete column structure of this example has a precast steel pipe concrete column built above the upper precast steel pipe concrete column l on the top of the precast steel pipe concrete column l built below. At the same time, bolt and nut the upper joint plate 7, which also serves as a beam joint, of the lower precast steel pipe concrete column and the lower joint plate 11 of the upper precast steel pipe concrete column! Precast steel pipe concrete columns can be connected to a predetermined floor height by simply connecting them using 3. Since the steel pipes are not welded together, there is no risk of the concrete inside the steel pipes or joints being deteriorated by welding heat. . In addition, the upper joint plate 8 is made of lining concrete 3.
At the same time, the lower joint plate 11 presses the concrete 12 placed inside the steel pipe, so the beam 9.9.・
- The axial F1 weight acting on the steel pipe 2 can be reliably transmitted to the concrete 3.12 inside. Also,
Before lining the joint part 4 with concrete,
Since the connecting plate 5 and the upper joint plate 8 are provided, the beam 9
Further, there is no need to directly weld the bracket member to the concrete-lined steel pipe 2, and there is no possibility that high-temperature welding heat is transmitted to the lining concrete 3 of the joint part 4 and deteriorates the concrete. Furthermore, in this embodiment, since the joint part 4 is constituted by the steel pipe 6 having a larger diameter than the steel pipe 2, the joint part 4 is subjected to complicated forces.
can be made even stronger. Therefore, the precast steel pipe concrete column structure of this example is suitable for use in the lower floors of high-rise buildings.

In the above embodiment, the first through hole 7 of the upper joint plate 8 is formed to have approximately the same diameter as the inner diameter of the lining concrete 3, and the lower joint plate! Although the diameter of the second through hole lO of l is smaller than the inner diameter of the lining concrete 3, the first through hole 7 is not limited to this.
It may be formed smaller than the inner diameter of the first. Both of the second through holes may be formed smaller than the inner diameter of the lining concrete 3. In that case, the functions of the upper joint plate 8 and the lower joint plate 11 are the same as in the above embodiment.

Further, as a modification of the above embodiment, if the construction period is short and there is no problem in terms of strength, the design may be such that the step (v) above is omitted. In this case, the first through hole 7 of the upper joint plate 8 and the second through hole 10 of the lower joint plate II may have approximately the same diameter as the inner diameter of the lining concrete.

Next, a second embodiment of the present invention will be described using FIG. 5. This second embodiment is based on the connection section 4 of the first embodiment described in 1.
The part of the large diameter steel pipe 6 installed in the steel pipe 2 has the same diameter as the steel pipe 2.
The other configurations are exactly the same as the first embodiment of Moeki.

Therefore, in this second embodiment as well, it is possible to achieve the same effects as in the first embodiment, and the joint part has a simple shape, making it easy to manufacture and reducing the weight of the pillar. , is suitable for use in the upper layer.

In addition, in the above embodiment, the length of the precast steel pipe concrete column 1 is three floors, but the length is not limited to this, and the length can be one floor, two floors, or multiple floors of four or more floors. Of course you can.

"Effects of the Invention" As explained above, the precast JIJL pipe concrete column structure of the present invention is provided with an upper joint plate that also serves as a beam joint flange at the upper end of the steel pipe, and a lower joint plate at the lower end. Therefore, an upper precast steel pipe concrete column is erected on top of the precast steel pipe concrete column erected below, and the L joint plate and the lower joint plate provided thereon are connected by connecting members such as bolts. By simply connecting precast steel pipe concrete columns to a predetermined floor height, columns can be constructed efficiently, and there is no need to directly weld beam joint members (brackets, etc.) to concrete lining steel pipes. This prevents the internal lining concrete from deteriorating due to high-temperature welding heat. In addition, the upper joint plate has the first ff through hole formed, and the lower joint plate has the second through hole, so it is possible to easily and reliably place concrete on site with good quality. can. Also, the above 1. If at least one of the second through holes is formed to be smaller than the inner diameter of the lining concrete, after the filling concrete has hardened, the upper joint plate and the lower joint plate will serve as bearing plates, and the steel pipe will This has an extremely favorable effect as an M'in concrete structure that can reliably transmit the applied axial shearing force to the concrete inside.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the present invention, FIG. 1 is a side sectional view of a precast steel pipe concrete column of the present invention, FIG. 2 is a plan sectional view of a joint part, Figures 3 and 4 are side sectional views of a joint part formed in the middle of precast steel pipe concrete, and Figure 5 shows the second embodiment, and is a side sectional view of a precast steel pipe concrete column. . 1... Precast steel pipe concrete column, 2.
... Steel pipe, 3 ... Lining concrete, 4 ... Connection section, 8 ... Upper joint plate, 11 ... Lower joint plate, 12... Filled concrete (concrete)), 13... Bolts and nuts (connecting members).

Claims (2)

[Claims] (1) Lining concrete is formed on the inner peripheral surface of the steel pipe by centrifugal force, and an upper joint plate that also serves as a beam joint flange with a first through hole is provided at the upper end of the steel pipe, and an upper joint plate that also serves as a beam joint flange is provided at the lower end. is provided with a lower joint plate in which a second through hole is formed in the center and is connected to the upper joint plate by a connecting member, and the first through hole and the second through hole have approximately the same diameter as the inner diameter of the lining concrete. A precast steel pipe concrete column structure characterized by being formed. (2) A lining concrete is formed on the inner circumferential surface of the steel pipe by centrifugal force, and an upper joint plate that also serves as a beam joint flange is provided at the upper end of the steel pipe with a first through hole formed in the center, and The lower end portion is provided with a lower joint plate having a second through hole formed in the center thereof and connected to the upper joint plate by a connecting member, and at least one of the first through hole and the second through hole, A precast steel pipe concrete column structure, characterized in that the inner diameter of the lining concrete is smaller than that of the lining concrete, and that the lining concrete is filled with filling concrete.