JP2017110442A - Joining structure of steel pipe column - Google Patents

Abstract

An object of the present invention is to provide a joint structure for steel pipe columns that does not require welding work, is excellent in workability, and can sufficiently withstand compressive force. SOLUTION: A steel pipe column joint structure for joining steel pipe columns 3 vertically includes a steel pipe column 3 formed at an upper portion and a reduced diameter portion 11 gradually decreasing in diameter toward the upper end, and a reduced diameter portion 11 formed at the lower portion and at the lower end. A diameter-enlarged portion 12 that gradually expands in diameter, and a ring-shaped member 13 provided below the diameter-reduced portion 11 on the outer peripheral surface of the steel pipe column 3, and the diameter-reduced portion 11 of the lower steel pipe column 3 is inserted into the enlarged diameter portion 12 of the upper steel pipe column 3 , the lower end surface of the upper steel pipe column 3 is in contact with the ring-shaped member 13 . [Selection drawing] Fig. 3

Description

  The present invention relates to a joining structure of steel pipe columns.

In tunnel construction, bridge construction, etc. in mountainous areas, an upper structure such as a temporary pier structure may be constructed in order to allow a construction vehicle for carrying goods to enter.
An upper structure such as a temporary pier structure is constructed by driving a plurality of piles into the soil, building a pillar on the pile, and building a beam between the pillars.
Conventionally, when transporting materials to such mountainous areas, the column members are transported within the transport limit length, welded and joined at the construction site, and the site is built on the site.
However, in order to lift a long column, a large crane is required, and the butt welding work of a steel pipe at a construction site requires sufficient management of the welding quality, and the construction efficiency is high. There is a problem of falling.

On the other hand, as a power column in a city, a short column having a reduced diameter part in which the upper end of the steel pipe is reduced and an enlarged part in which the lower end of the steel pipe is enlarged is used. A technique using a jointed column in which an enlarged diameter portion is inserted into a diameter portion is known (see, for example, Patent Document 1).
Further, as a similar technique, a technique is known in which a shape memory alloy collar is welded to the end of a short steel pipe and the short steel pipes are connected to each other by utilizing the shape recovery action of the collar (for example, patents). Reference 2).
Such a joint-type column using a short steel pipe is easy to construct and does not require welding work, so it is considered suitable for use as a column of a temporary pier structure or the like.

Japanese Patent Laying-Open No. 2015-74924 Japanese Patent Laid-Open No. 06-257325

  However, when the techniques disclosed in Patent Document 1 and Patent Document 2 are used for a column such as a temporary pier structure, a heavy structure such as a material or a crane is placed on the temporary structure, and a compression force is applied to the column. Therefore, there is a problem in that the joining portion may be displaced in the compression direction, and the length of the column is reduced. Also, there is almost no resistance mechanism for tensile force.

  An object of the present invention is to provide a steel pipe column joining structure that does not require welding work, has excellent workability, and can sufficiently withstand compressive force.

  The steel pipe column joining structure according to the present invention is a steel pipe column joining structure for joining steel pipe columns up and down, and the steel pipe column is formed at an upper portion, and a reduced diameter portion gradually reducing in diameter toward the upper end; A diameter-reduced portion formed at the lower portion and gradually expanding toward the lower end, and a ring-shaped member provided on the outer peripheral surface of the steel pipe column and below the reduced-diameter portion, and having a reduced diameter of the lower steel tube column When the portion is inserted into the enlarged diameter portion of the upper steel pipe column, the lower end surface of the upper steel pipe column is in contact with the ring-shaped member.

  According to this invention, when the ring-shaped member is provided on the outer peripheral surface of the steel pipe column, when the reduced diameter portion of the lower steel pipe column is inserted into the enlarged diameter portion of the upper steel pipe column, Since the end face of the steel pipe column is in contact with the ring-shaped member, the ring-shaped member acts as a resistance in the compression direction even if an axial compressive force is applied to the steel pipe column's joint structure. There will be no deviation.

In the present invention, the outer peripheral surface of the steel pipe column is provided with a gusset plate protruding outside the steel pipe column between the reduced diameter portion and the enlarged diameter portion, and the upper and lower gusset plates are connected by a connecting member. It is possible.
According to this invention, by providing the gusset plate, the upper and lower steel pipe columns can be connected by the connecting member. Therefore, even if a pulling direction force acts on a joint column formed by joining a plurality of steel pipe columns, the connecting member becomes a resistance, and the steel pipe column joining structure does not come off.

In the present invention, steel wires penetrating the upper and lower steel pipe columns are drawn through the steel pipe columns, and the steel wires are fastened to the pile driven into the soil, and the steel pipe columns support the beams. It is conceivable that the upper end is fastened.
According to the present invention, a steel wire penetrating through a plurality of steel pipe columns is passed through, a lower end of the steel wire is fastened to a pile, and an upper end is fastened to a beam supported by the steel pipe column, thereby a plurality of steel pipes Even if a force in the pulling direction acts on the joint column formed by joining the columns, the tension of the steel wire becomes a resistance, and the joint portion of the steel pipe column does not come off.

The schematic diagram showing the structure of the temporary jetty which concerns on 1st Embodiment of this invention. The side view showing the steel pipe pillar in the said embodiment. The vertical direction sectional view showing the joining structure of the steel pipe pillar in the embodiment. The vertical direction sectional view showing the joining structure of the steel pipe pillar concerning a 2nd embodiment of the present invention. The vertical direction sectional view showing the connection structure of the steel pipe pillar concerning a 3rd embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[1] First Embodiment FIG. 1 shows a temporary pier structure 1 as an upper structure according to a first embodiment of the present invention. This temporary pier structure 1 is used as an entry route for construction vehicles for carrying materials in construction work such as bridge replacement work in mountainous areas, tunnel excavation work, etc. Or used as a place to install cranes and other heavy lifting machines.
The temporary pier structure 1 is constructed on a plurality of steel pipe piles 2 and includes a plurality of steel pipe columns 3, a plurality of beams 4, and braces 5.

The steel pipe pile 2 is composed of a circular steel pipe having a diameter of 500 to 600 mm and a length of about 7 m, and is driven into the soil by a known method. However, since there is a height difference of the ground, the high stop position differs depending on the location. .
The steel pipe column 3 is composed of a circular steel pipe having a diameter of 300 to 500 mm and a length of about 7 m. Two to three steel pipe columns 3 are connected in the vertical direction, and have a total length of about 20 to 30 m.

The beam 4 is made of H-shaped steel or the like, and connects the intermediate position and the top of the plurality of steel pipe columns 3 erected on the steel pipe pile 2, and the floor plate 4 </ b> A is installed on the top beam 4.
The brace 5 is composed of a steel rod or the like, and is obliquely crossed at the intersection of the steel pipe column 3 and the beam 4, thereby forming a rectangle composed of a pair of steel tube columns 3 and a pair of beams 4 facing each other. It becomes a surface.

FIG. 2 shows a steel pipe column 3 of the present embodiment. The steel pipe column 3 includes a reduced diameter portion 11, an enlarged diameter portion 12, and a ring plate 13.
The reduced diameter part 11 is formed in the upper part of the steel pipe column 3, and is gradually reduced in diameter toward the upper end. Such a reduced diameter portion 11 can be formed by reducing the diameter of the steel pipe end.
The enlarged diameter portion 12 is formed at the lower part of the steel pipe column 3 and gradually increases in diameter toward the lower end. Such a diameter expansion part 12 can be formed by giving a diameter expansion process to the steel pipe end part.

  The ring plate 13 as a ring-shaped member is provided on the body portion of the steel pipe column 3 below the reduced diameter portion 11. The ring plate 13 is formed by forming a concentric hole substantially at the center of a disk-shaped steel plate, and the diameter of the hole is substantially equal to the outer diameter of the steel pipe column 3. The ring plate 13 is joined to the body portion of the steel pipe column 3 by welding.

FIG. 3 is a vertical cross-sectional view showing the joint structure of the steel pipe columns 3 arranged above and below. The reduced diameter portion 11 of the lower steel pipe column 3 is inserted into the enlarged diameter portion 12 of the upper steel pipe column 3.
The insertion depth dimension of the reduced diameter portion 11 into the enlarged diameter portion 12 is set to be twice or more the diameter of the steel pipe column 3.
In this state, the lower end surface of the upper steel pipe column 3 is in contact with the upper surface of the ring plate 13 of the lower steel pipe column 3.

Next, a method for joining the steel pipe columns 3 will be described.
After the lower steel pipe column 3 is built on the steel pipe pile 2, the upper steel pipe column 3 is lifted by a crane or the like and lowered to the lower steel pipe column 3, and the diameter of the lower steel pipe column 3 is reduced. After engaging the portion 11 and the enlarged diameter portion 12 of the upper steel pipe column 3, the upper end of the upper steel pipe column 3 is driven with a hammer or the like. The driving is performed until the lower end surface of the upper steel pipe column 3 comes into contact with the upper surface of the ring plate 13.

According to this embodiment, there are the following effects.
Since the ring plate 13 is provided on the outer peripheral surface of the steel pipe column 3, when the reduced diameter portion 11 of the lower steel pipe column 3 is inserted into the enlarged diameter portion 12 of the upper steel pipe column 3, the upper steel pipe Since the end surface of the column 3 is in contact with the ring plate 13, the ring plate 13 acts as a resistance in the compression direction even if an axial compression force acts on the bonded structure of the steel tube column 3. There is no deviation in the compression direction.

[2] Second Embodiment Next, a second embodiment of the present invention will be described. In the following description, members, parts, and the like that have already been described are denoted by the same reference numerals, and description thereof will be omitted or simplified.
In the first embodiment described above, the ring plate 13 is merely joined to the outer peripheral surface of the steel pipe column 3 by welding.
On the other hand, in this embodiment, as shown in FIG. 4, a gusset plate 14 is provided on the outer peripheral surface of the steel pipe column 3, and the gusset plates 14 of the upper and lower steel pipe columns 3 are connected by an attachment plate 15. Is different.

The gusset plate 14 is made of a steel plate and is provided to project radially outward from the body portion of the steel pipe column 3, and a plurality of bolt holes are formed at the projecting tip.
The gusset plate 14 of the lower steel pipe column 3 and the gusset plate 14 of the upper steel pipe column 3 are connected by an attachment plate 15 serving as a connecting member.
The attachment plate 15 is formed of a steel plate having bolt holes formed at both ends, and is fastened by inserting and screwing bolt nuts 16 into bolt holes formed in the gusset plate 14. The brace 5 is fastened to the gusset plate 14 by bolts and nuts 16.

According to this embodiment, in addition to the effects described in the first embodiment, the following effects can be obtained.
By providing the gusset plate 14, the upper and lower steel pipe columns 3 can be connected by the attachment plate 15. Therefore, even if a pulling-direction force acts on a joint column formed by joining a plurality of steel pipe columns 3, the joining plate 15 does not become a resistance and the joining structure of the steel pipe columns 3 does not come off.
Moreover, since the brace 5 can be connected by providing the gusset plate 14, the brace 5 can be easily connected when the temporary jetty structure 1 is constructed.
The gusset plate 14 is installed outside the double pipe portion at the joint. That is, the gusset plate 14 can bear a larger load than when it is disposed in the normal part without providing a diaphragm inside.

[3] Third Embodiment Next, a third embodiment of the present invention will be described.
In the above-described second embodiment, the gusset plate 14 is provided on the steel pipe column 3 and is connected by the attachment plate 15, thereby ensuring the pulling strength of the joining structure of the steel pipe column 3.
On the other hand, in this embodiment, as shown in FIG. 5, the steel wire 17 is passed through the steel pipe column 3 to ensure the pulling strength of the joint structure of the steel pipe column 3.

The steel wire 17 is disposed substantially at the center of the steel pipe column 3 and is passed over the upper and lower steel pipe columns 3.
The lower end of the steel wire 17 is fastened to the steel pipe pile 2, and the upper end of the steel wire 17 is fastened to the beam 4 supported by the upper steel pipe column 3.
When passing the steel wire 17, the lower end of the steel wire 17 is fastened to the steel pipe pile 2, the upper end of the steel wire 17 is pulled up with a rope or the like, and a predetermined tensile force is applied. It fastens to the beam 4 which the steel pipe pillar 3 supports.
Also according to this embodiment, the pulling-out strength of the connection structure of the steel pipe column 3 can be ensured as in the second embodiment described above.

[4] Modifications of Embodiments The present invention is not limited to the above-described embodiments, and includes the following modifications.
In the first embodiment described above, the present invention is applied to the temporary pier structure 1, but the present invention is not limited to this, and the present invention may be applied to other structures.
In the first embodiment described above, the steel pipe column 3 is constituted by a circular steel pipe. However, the present invention is not limited to this, and may be a steel pipe column having a polygonal cross section, for example.

In the first embodiment described above, the inside of the steel pipe column 3 is hollow, but after joining the steel pipe column 3, the inside may be filled with mortar or the like. By filling with mortar or the like, the compressive strength of the steel pipe column 3 can be improved, so that the connection structure of the jointed steel pipe column 3 can be prevented from buckling.
In 1st Embodiment mentioned above, although the ring plate 13 which formed the hole in the circular steel plate was employ | adopted as a ring-shaped member, this invention is not limited to this. For example, a ring-shaped member may be formed by cutting a part of the ring plate 13 or a ring-shaped member having a plurality of protrusions formed on the body of a steel pipe column, and the end face of the upper steel pipe may be brought into contact with the ring-shaped member. Good.
In addition, the present invention may have other structures as long as the object of the present invention can be achieved.

  DESCRIPTION OF SYMBOLS 1 ... Temporary pier structure, 2 ... Steel pipe pile, 3 ... Steel pipe column, 4 ... Beam, 4A ... Floor board, 5 ... Brace, 11 ... Reduced diameter part, 12 ... Expanded part, 13 ... Ring plate, 14 ... Gusset plate , 15 ... Connecting plate, 16 ... Bolt and nut, 17 ... Steel wire

Claims (3)

A steel pipe column joining structure for joining steel pipe columns up and down,
The steel pipe column is formed at an upper portion, and a diameter-reduced portion that gradually decreases in diameter toward the upper end, a diameter-expanded portion that is formed at the lower portion and gradually increases in diameter toward the lower end, and an outer peripheral surface of the steel pipe column. And a ring-shaped member provided below the reduced diameter portion,
When the reduced diameter part of the lower steel pipe column is inserted into the enlarged diameter part of the upper steel pipe column, the lower end surface of the upper steel pipe column is in contact with the ring-shaped member. A characteristic steel tube column joint structure. In the steel pipe column joint structure according to claim 1,
On the outer peripheral surface of the steel pipe column, a gusset plate that protrudes radially outward of the steel pipe column is provided between the reduced diameter portion and the enlarged diameter portion, and the upper and lower gusset plates are connected by a connecting member. Steel pipe column connection structure characterized by being made. In the steel pipe column joint structure according to claim 1,
Inside the steel pipe column, steel wires penetrating the upper and lower steel pipe columns are drawn, and the lower end of the steel wire is fastened to a pile driven into the soil, and the beam supported by the steel pipe column A steel pipe column joining structure characterized in that the upper end is fastened.

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