JPH05287847A - Double steel pipe pillar filled with cold setting material - Google Patents

Abstract

PURPOSE:To manufacture a double steel pipe-pillar filled with cold setting material at low cost and with high efficiency. CONSTITUTION:Plural large diameter steel pipes 1 and plural small-diameter steel pipes 2 are arranged in series respectively and concentrically, and the butt edge part 3 of the large-diameter steel pipe 1 and the butt edge part 4 of the small diameter steel pipe 2 are arranged so that they are deviated from each other along the length of these steel pipes. Then, the ring-shaped clearance between a train of the large-diameter steel pipes 1 and a train of the small- diameter steel pipes 2 is filled with cold setting material 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold-curable material-filled double steel pipe column used as a column for a frame of a building, a pier, an artificial ground support structure or the like.

[0002]

2. Description of the Related Art Conventionally, as a cold-hardening material-filled double steel pipe column, as shown in FIGS. The large diameter steel pipe 10 is formed, and the ends of a plurality of small diameter steel pipes 2 are joined by welding over the entire circumference to form a long small diameter steel pipe 11. The long large diameter steel pipe 10 and the long small diameter steel pipe 11 are concentric with each other. Known is a structure in which concrete 12 is filled in the annular gap between the long large diameter steel pipe 10 and the long small diameter steel pipe 1.

[0003]

In the case of the conventional cold-hardening material-filled double steel pipe column, the ends of a plurality of large-diameter steel pipes 1 are joined by full circumference welding to form a long large-diameter steel pipe 10. Since it is necessary to construct the long small-diameter steel pipe 11 by connecting the ends of a plurality of small-diameter steel pipes 2 by full-circle welding, the welding amount increases, the cost increases, and the manufacturing efficiency is low. There is a problem.

[0004]

In order to advantageously solve the above-mentioned problems, in a room temperature hardening material-filled double steel pipe column of the present invention, a plurality of large diameter steel pipes 1 and a plurality of small diameter steel pipes 2 are provided.
In addition to being arranged in series and concentrically, the abutting portion 3 of the large diameter steel pipe 1 and the abutting portion 4 of the small diameter steel pipe 2 are arranged so as to be offset in the longitudinal direction of the steel pipe, and the rows of the large diameter steel pipes 1 are arranged. The room temperature curable material 5 is filled in the annular gap between each row of the small diameter steel pipes 2. Further, in order to sufficiently transmit the bending moment between the large diameter steel pipe 1 and the small diameter steel pipe 2 and the room temperature curable material 5, to strengthen the room temperature curable material-filled double steel pipe column,
An inner protrusion 6 is provided on the inner surface of the large diameter steel pipe 1, and an outer protrusion 7 is provided on the outer surface of the small diameter steel pipe 2, and the inner protrusion 6 and the outer protrusion 7 are engaged with the room temperature curable material 5. Further, in order to reinforce the bending strength in the vicinity of the abutting portion 3 of the large diameter steel pipe 1 and in the vicinity of the abutting portion 4 of the small diameter steel pipe 2 in the room temperature hardening material filled double steel pipe column, the abutting portion 3 of the large diameter steel pipe 1 is provided. At a position facing each other and a position facing the butt portion 4 of the small diameter steel pipe 2, a reinforcing material 8 extending in the longitudinal direction of the steel pipe is embedded in the room temperature curable material 5. Furthermore, large diameter steel pipe 1 and small diameter steel pipe 2
In order to keep a constant space between the steel pipe 1 and the outer surface of the small-diameter steel pipe 1, a plurality of spacers 9 for keeping the space between the steel pipes
Are fixed at intervals around the steel pipe.

[0005]

1 to 8 show an embodiment of the present invention. First, as shown in FIGS. 1 to 4, a large-diameter steel pipe 1 having a circular cross section in which internal projections 6 are integrally connected. A plurality of steel pipe spacing holding spacers 9 made of steel plates are provided at one end of the inside.
Spacers 9 arranged at substantially equal intervals in the circumferential direction of the steel pipe and fixed by welding or the like and arranged on the outer surface of the intermediate portion of the small diameter steel pipe 2 having a circular cross section project from the end surface of the large diameter steel pipe 1 and at the tip of the protruding portion. A guide guiding slope 13 for fitting is provided.

External projections 7 are integrally connected to the outer surface of a steel pipe having a circular cross section to form a small diameter steel pipe 2. The small diameter steel pipe 2
On the outer surface of one end of the
The spacers 9 arranged at substantially equal intervals in the circumferential direction of the steel pipe and fixed by welding or the like and arranged on the outer surface of the intermediate portion of the large diameter steel pipe 1 project from the end face of the small diameter steel pipe 2 and are fitted at the tips of the protruding parts. A large-diameter steel pipe 1 or a small-diameter steel pipe 2 provided with guide guide slopes 13 and located at both ends of a double steel pipe column.
A plurality of spacers 9A that do not protrude from the end surface of the steel pipe,
The steel pipes are arranged at substantially equal intervals in the circumferential direction and fixed by welding or the like. An intermediate portion of a reinforcing member 8 made of a reinforcing bar extending in the longitudinal direction of the steel pipe is fixed to each spacer 9 by welding.

A plurality of small-diameter steel pipes 2 are arranged in series and the ends of each small-diameter steel pipe 2 are simply abutted without being welded all around, and the plurality of large-diameter steel pipes 1 are small-diameter steel pipes 2. Is arranged so as to surround each of the large-diameter steel pipes 1
The ends of each are simply butted together without being welded all around, and each spacer 9 and 9A allows each large diameter steel pipe 1 and each small diameter steel pipe 2 to be joined.
And are arranged concentrically.

The abutting portion 3 of the large-diameter steel pipe 1 and the abutting portion 4 of the small-diameter steel pipe 2 are displaced by a predetermined length L (see FIG. 8) in the longitudinal direction of the steel pipe so as not to overlap in the inward and outward directions of the steel pipe. Are arranged.

Next, as shown in FIGS. 6 and 7, a room temperature hardening material 5 made of concrete is filled between each large diameter steel pipe 1 and each small diameter steel pipe 2, and each reinforcing material 8 is cured at room temperature. The cold-curable material-filled double steel tubular column 14 is embedded in the flexible material 5.

In the cold-curable material-filled double steel pipe column 14 constructed as described above, the abutting portion 4 of the small diameter steel pipe 2 is joined.
At a position opposite to, the large-diameter steel pipe 1 and the ring-shaped cold-setting material 5 form a composite structure and resist moments as shown in FIG. Even if they are not joined by circumferential welding, the moment can be transmitted in the vicinity of the abutting portion 4 of the adjacent small diameter steel pipes 2. In FIG. 11, σ1 is the sectional stress distribution of the room temperature curable material 5, and σ2 is the sectional stress distribution of the large diameter steel pipe 1. Further, at a position facing the abutting portion 4 of the large diameter steel pipe 1, the small diameter steel pipe 2 and the annular room temperature hardening material 5 form a composite structure and resist a moment as shown in FIG. Even if the end portions of the large-diameter steel pipes 1 to be fitted are not joined by the entire circumference welding, the abutting portions 3 of the adjacent large-diameter steel pipes 1
Moments can be transmitted in the vicinity.
In FIG. 12, σ1 is the sectional stress distribution of the room temperature curable material 5, and σ3 is the sectional stress distribution of the small diameter steel pipe 2.

Further, in the general portion without the butting portions 3 and 4, the cold-setting material-filled double steel tube column 14 is a three-layer composite composed of a large-diameter steel tube 1, a small-diameter steel tube 2 and a cold-setting material 5. Since the structure resists external force, it has a large load-bearing force, and therefore, at the abutting portion 3 of the large diameter steel pipe 1 and the abutting portion 4 of the small diameter steel pipe 2, it is slightly lower than the general portion. However, if the abutting portions 3 and 4 are arranged at positions where the moment acting on the entire room temperature hardening material-filled double steel tubular column 14 is small, the abutting portions 3 and 4 are formed.
Can be prevented from having a great adverse effect on the load bearing capacity of the cold-curable material-filled double steel tubular column 14.

As described above, the abutting portion 3 of the large diameter steel pipe 1
The butt portion 4 of the small diameter steel pipe 2 and the general portion have different proof stress against moment and different flow of stress, but the butt portion 3 of the large diameter steel pipe 1 and the butt portion 4 of the small diameter steel pipe 2 are suitable. If they are separated by the length, it is possible to minimize the decrease in the proof stress of the butted portions 3, 4.

Further, the proof strength lowering range of the butted portions 3 and 4 is
Since the large-diameter steel pipe 1 and the small-diameter steel pipe 2 are related to the magnitude of the frictional force between the room-temperature curable material 5, the inner protrusion 6 is provided on the inner surface of the large-diameter steel pipe 1 and the outer protrusion 7 is provided on the outer surface of the small-diameter steel pipe 2. As a result, the proof stress lowering range can be shortened, and thus the displacement distance between the abutting portion 3 of the large diameter steel pipe 1, the small diameter steel pipe 2, the abutting portion 4 can be shortened.

If a reinforcing material 8 extending in the longitudinal direction of the steel pipe is embedded in the room temperature curable material 5 at a position facing the abutting portion 3 of the large diameter steel pipe 1 and the abutting portion 4 of the small diameter steel pipe 2, they are adjacent to each other. Even if the ends of the large-diameter steel pipe 1 and the ends of the adjacent small-diameter steel pipes 2 are not joined by full-circumferential welding, the tensile force of the steel pipe can be supplemented by the reinforcing material 8.
It is possible to increase the moment proof stress of the butted portions 3 and 4 in the cold-curable material-filled double steel tube column 14.

FIG. 8 shows an example in which a cold-curable material-filled double steel pipe column 14 of the present invention is used as a column member in a rigid frame structure such as a bridge pier, and two large-diameter steel pipes 1 are used. 2 is provided at a position half the height of the cold-curable material-filled double steel pipe column 14, and the abutting portions 4 of the three small-diameter steel pipes 2 are large-diameter steel pipes 1. A horizontal member 15 is arranged above and below the butting portion 3 by a predetermined length L, and a horizontal member 15 is erected over the upper ends of a plurality of cold-curing material-filled double steel pipe columns 14.

In carrying out the present invention, the reinforcing member 8 made of L-shaped steel may be used as shown in FIG. 9 or the reinforcing member 8 made of channel steel as shown in FIG. Alternatively, a reinforcing member made of a strip steel plate having a large number of through holes may be used.

When the present invention is carried out, the spacers 9 are not used, and a plurality of positions at the ends of the adjacent large diameter steel pipes 1 and a plurality of positions at the ends of the adjacent small diameter steel pipes 2 are temporarily fixed by spot welding. Good. When the room temperature curable material 5 is injected and filled between the row of large diameter steel pipes 1 and the row of small diameter steel pipes 2, the room temperature curable material 5 is press-fitted from the inlet provided at the lower end of the large diameter steel pipe 1. Good. Furthermore, the room temperature curable material 5 may be filled in several times at each building stage of the small diameter steel pipe 2 and the large diameter steel pipe 1.

[0018]

According to the present invention, a plurality of large-diameter steel pipes 1 and a plurality of small-diameter steel pipes 2 are arranged in series and concentrically, and the abutting portion 3 of the large-diameter steel pipe 1 and the small-diameter steel pipe 2 are arranged. The butt portion 4 of the steel pipe is displaced in the longitudinal direction of the steel pipe, and the annular gap between the row of each large diameter steel pipe 1 and each row of each small diameter steel pipe 2 is filled with the room temperature curable material 5. , A cold-curing material-filled double steel pipe column 14 in which a cold-curing material 5 is filled between a plurality of large-diameter steel pipes 1 and a plurality of small-diameter steel pipes 2,
It is possible to manufacture at low cost and with high efficiency, without performing the entire circumference welding of the end portion and the entire circumference welding of the end portion of the small diameter steel pipe 2. Further, by providing the inner protrusion 6 on the inner surface of the large diameter steel pipe 1 and the outer protrusion 7 on the outer surface of the small diameter steel pipe 2, a moment is generated between the large diameter steel pipe 1 and the small diameter steel pipe 2 and the room temperature curable material 5. It can be sufficiently transmitted to strengthen the cold-curing material-filled double steel pipe column 14. Further, by embedding the reinforcing material 8 extending in the longitudinal direction of the steel pipe in the room temperature curable material 5 at a position facing the butt portion 3 of the large diameter steel pipe 1 and a position facing the butt portion 4 of the small diameter steel pipe 2, It is possible to reinforce the bending strength in the vicinity of the abutting portion 3 of the large diameter steel pipe 1 and in the vicinity of the abutting portion 4 of the small diameter steel pipe 2 in the cold-curable material-filled double steel pipe column 14.
Furthermore, by fixing the spacers 9 for holding the steel pipe intervals to the inner surface of the large-diameter steel pipe 1 or the outer surface of the small-diameter steel pipe 2, the large-diameter steel pipe 1 and the small-diameter steel pipe 2 are held almost concentrically, and a room temperature of an accurate structure is obtained. The hardened material filled double steel tubular column 14 can be manufactured.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing a part of a state in which a large-diameter steel pipe and a small-diameter steel pipe having a reinforcing material and a spacer for maintaining a space between steel pipes are concentrically arranged.

FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 3 is an enlarged sectional view taken along line BB of FIG.

FIG. 4 is a vertical sectional side view showing a part of FIG. 1 in an enlarged manner.

FIG. 5 is a vertical cross-sectional side view showing ends of a large-diameter steel pipe and a small-diameter steel pipe concentrically arranged.

FIG. 6 is a vertical cross-sectional side view showing a part of a cold-curable material-filled double steel tubular column.

FIG. 7 is an enlarged cross-sectional view taken along line CC of FIG.

FIG. 8 is a front view showing a rigid frame structure using the cold-curing material-filled double steel tubular column of the present invention.

FIG. 9 is a cross-sectional plan view showing a room temperature hardening material-filled double steel tubular column using a reinforcing material made of L-shaped steel.

FIG. 10 is a cross-sectional plan view showing a room temperature hardening material-filled double steel tubular column using a reinforcing material made of channel steel.

FIG. 11 is a diagram showing a moment load-bearing force in the vicinity of a butt portion of a small diameter steel pipe.

FIG. 12 is a diagram showing a moment load-bearing force in the vicinity of a butt portion of a large-diameter steel pipe.

FIG. 13 is a vertical cross-sectional side view showing a part of a conventional cold-setting material-filled double steel tubular column.

FIG. 14 is a vertical sectional side view showing a part of FIG. 13 in an enlarged manner.

[Explanation of symbols]

 1 Large-diameter steel pipe 2 Small-diameter steel pipe 3 Butt part 4 Butt part 5 Room temperature hardening material 6 Internal projection 7 External projection 8 Reinforcing material 9 Spacer for holding steel tube spacing 13 Guide slope 14 Cold hardening material filled double steel pipe column

Claims (4)

[Claims] 1. A plurality of large-diameter steel pipes 1 and a plurality of small-diameter steel pipes 2 are arranged in series and concentrically, and a butt portion 3 of the large-diameter steel pipe 1 and a butt portion 4 of the small-diameter steel pipe 2 are provided. Are arranged in the longitudinal direction of the steel pipe, and the cold-curable material-filled double steel pipe is filled with the cold-curable material 5 in the annular gap between the row of each large-diameter steel tube 1 and each row of each small-diameter steel tube 2. Pillar. 2. An internal protrusion 6 is provided on the inner surface of the large diameter steel pipe 1,
An external projection 7 is provided on the outer surface of the small diameter steel pipe 2, and the internal projection 6 is provided.
The cold-curing material-filled double-steel pipe column according to claim 1, wherein the external projection 7 is engaged with the cold-curing material 5. 3. A reinforcing material 8 extending in the longitudinal direction of the steel pipe is embedded in the room temperature curable material 5 at a position facing the butt portion 3 of the large diameter steel pipe 1 and a position facing the butt portion 4 of the small diameter steel pipe 2. The double steel pipe column filled with the room temperature curable material according to claim 1. 4. A cold-curable material-filled double steel pipe according to claim 1, wherein a plurality of spacers 9 for maintaining a space between the steel pipes are fixed to the inner surface of the large-diameter steel pipe 1 or the outer surface of the small-diameter steel pipe 2 at intervals in the circumferential direction of the steel pipe. Pillar.