JPH0718670A - Joint structure for steel pipe pillar - Google Patents

Abstract

PURPOSE:To prevent the hooking of a net by fixing a joint member at the upper end of a lower steel pipe, fixing an upper flange having the same shape as that of a lower flange at the lower end of an upper steel pipe, providing guide pieces on the peripheral edge of the upper flange, and connecting them. CONSTITUTION:A lower steel pipe 1a and the second steel pipe 1b are connected via a joint member 20. A base plate 20a having nearly the same outer shape as the outer shape of the steel pipe 1a and a lower flange 20b are integrally connected into the joint member 20 via a spacer member 20c at the upper end of the lower steel pipe 1a. An upper flange 21 having the same shape as that of the lower flange 20b of the joint member 20 is fixed at the lower end of the upper steel pipe 1b. Reinforcing guide pieces 22 protruded from the peripheral edge of the upper flange 21 and the peripheral face of the upper steel pipe 1b outward and having curved faces are formed on the upper face of the upper flange 21. The base plate 20a of the joint member 20 is fixed to the upper end section of the lower steel pipe 1a by welding. The upper flange 21 of the upper steel pipe 1b is brought into contact with the lower flange 20b of the joint member 20, and they are connected with bolts and nuts 23. Nothing is largely protruded outward from the lower steel pipe 1a, and hooking of a net or the like is prevented when the large-cross section lower steel pipe 1a and the small- cross section upper steel pipe 1b are connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for steel pipe columns, which is used for netting in golf courses, batting centers and the like and is constructed by connecting a plurality of steel pipes having different cross-sectional areas.

[0002]

2. Description of the Related Art Conventionally, in a golf course or driving range, a high protective net of about 40 to 50 m is stretched around the boundary of the golf course to prevent the ball from jumping from the field to the adjacent land. ing.

A pillar is used to stretch this protective net. As the most general pillar structure, pillar bodies arranged at predetermined intervals are connected by a large number of linear members in the horizontal or diagonal direction to form an overall structure. A steel tower with a truss structure that is integrated with is known.

However, since such a steel tower structure requires many members, there is a problem that the workability at the site is poor and that the wind pressure exerts a great influence on the members when the wind is strong. Further, since it is constructed by a large number of members, there is also a problem that the surrounding landscape is easily damaged.

As a countermeasure against this, a steel pipe column using a steel pipe having a large cross section has been developed in recent years. According to this, since each column can stand on its own, it is not necessary to connect the columns in the lateral direction, and Since the number of parts is small, the workability at the site is excellent, and the scenery is also very good.

[0006] Generally, the strength required for a column is higher in the lower part and lower in the upper part, and it is not economical not only to construct the entire column with the same cross section, but also the total weight is increased. , More foundation work is needed.

For this reason, in a steel pipe column using a steel pipe, a structure is adopted in which the entire column is divided into a plurality of parts in the height direction, the lower part has a large cross section, and the upper part has a smaller cross section.

FIG. 5 is a front view showing a joint structure of a steel pipe having such a large cross section and a steel pipe having a small cross section connected to the upper portion thereof. The upper end of the lower steel pipe 30 and the upper steel pipe 31 are shown in FIG.
At the lower ends of the mounting flanges 30a, 3 of the same shape
0b is fixed by welding, and the mounting flange 30
A and 30b are brought into close contact with each other and connected by bolts and nuts 32.

[0009]

However, in such a joint structure, since the mounting flanges 30a and 30b project more than the lower steel pipe 30 having a large cross section, there is a problem that the net is easily caught by this projecting portion. For this reason, the net cannot be lowered when a strong wind such as a typhoon occurs, and the steel pipe column easily falls.

As a countermeasure against this, for example, as shown in FIG. 6, the closing plate 36 having the same area as the cross section of the lower steel pipe 35.
The upper end of the lower steel pipe 35 is closed by means of this, and the mounting flange 38 of the upper steel pipe 37 of the same shape as the closing plate 36 is brought into contact with this upper surface, and the bolt 3 attached to the closing plate 36.
9 has a structure in which a nut 40 is screwed.

With this structure, since there is nothing protruding outside the lower steel pipe 35, it is possible to reduce catching of the net, but it is not possible to work while looking at the bolt 39 in the lower steel pipe 35. If the bolt 39 is partially damaged, it is difficult to replace it.

Therefore, the problem to be solved in the present invention is to prevent the net from being caught by allowing the upper steel pipe having a small cross section to be mounted without protruding the flange from the lower steel pipe having a large cross section, and further connecting bolts and nuts. The purpose is to obtain a joint structure for steel pipe columns that enables replacement inspection.

[0013]

In order to solve the above problems, the present invention provides a joint structure for a steel pipe column, wherein an upper steel pipe having a diameter smaller than that of the lower steel pipe is connected to an upper portion of the lower steel pipe. In addition, a base plate having substantially the same outer shape as that of the lower steel pipe, a lower flange arranged parallel to the base plate and having a bolt hole on the peripheral surface, and the base plate and the lower flange formed inside the bolt hole of the lower flange. Is fixed at a predetermined interval with a spacer member, and further a bolt hole corresponding to the bolt hole of the lower flange is formed at the lower end of the upper steel pipe to form an upper flange having the same shape as the lower flange. The lower flange of the joint member is provided with a guide piece that is fixed and further has a curved surface that protrudes outward along the peripheral edge of the upper flange and the peripheral surface of the upper steel pipe. Abut the upper flange of the di-and upper steel tube, characterized in that it was connected by bolts and nuts.

[0014]

According to the present invention, it is possible to connect a lower steel pipe with a large cross section and an upper steel pipe with a small cross section without providing anything that protrudes outward more than the lower steel pipe, and further connect the upper flange and the lower flange. The bolts and nuts are exposed at the upper part of the upper flange and the lower part of the lower flange, respectively.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The features of the present invention will be specifically described below with reference to the embodiments shown in the drawings.

FIG. 1 is an overall view showing an embodiment of the present invention, FIG. 2 is a detailed view of a joint portion of the steel pipe column shown in FIG. 1, FIG. 3 is a longitudinal sectional view of the joint portion, and FIG. 4 is a joint member only. It is a perspective view shown.

With reference to FIG. 1, reference numeral 1 denotes a steel pipe column for netting which is provided in a golf driving range and has a height of 50 m. Below the concrete foundation 2, a steel pipe pile 3 of about 12 m in the ground is provided. Is embedded. In addition, at the tip of the steel pipe column 1,
An arm 4 is provided in a substantially horizontal direction, and a guide wire 6 for tensioning a net is stretched between the arm 4 and a concrete anchor 5 provided in the ground. Reference numeral 7a is a ring attached to the net 7. The ring 7a is passed through the guide wire 6, and the pulling wire 8 of the net 7 is wound up by the electric winch 10 provided on the ground via the pulley 9 provided on the arm 4. Thereby, the net 7 can be stretched.

In the present embodiment, the steel pipe column 1 is made up of steel pipes 1a, 1b, 1c having three cross-sections, the diameters of which decrease toward the top, and each joint has a structure shown clearly in FIGS. 2 to 4. Are linked together by.

Referring to FIG. 2 showing the joint portion of the lower steel pipe 1a and the second steel pipe 1b, the steel pipe 1a has a diameter of 700 m.
m, the steel pipe 1b has a diameter of 500 mm.
a and 1b are connected via a joint member 20.

The joint member 20 has an integral structure in which a base plate 20a having substantially the same outer shape as that of the lower steel pipe 1a and a lower flange 20b arranged in parallel with the base plate 20a are connected by a cylindrical spacer member 20c. As shown in FIG. 4, a bolt hole 20d is formed on the outer peripheral side of the spacer member 20c of the lower flange 20b. A reinforcing plate 20e is provided in the radial direction between the base plate 20a and the lower flange 20b and in the middle of the bolt hole 20d.

On the other hand, at the lower end of the upper steel pipe 1b, an upper flange 21 having the same shape as the lower flange 20b of the joint member 20 is formed.
The upper flange 21 is formed with bolt holes 21a at positions corresponding to the bolt holes 20d of the lower flange 20b. Furthermore, the upper flange 21
A reinforcing guide piece 22 having a curved surface projecting outward from the peripheral edge of the upper flange 21 and the peripheral surface of the upper steel pipe 1b is provided on the upper surface of the.

In this embodiment, the base plate 20a of the joint member 20 is fixed to the upper end of the lower steel pipe 1a by welding, and the upper flange 21 fixed to the lower end of the upper steel pipe 1b is fixed on the lower flange 20b of the joint member 20. Are brought into contact with each other and are connected by bolts and nuts 23.

As described above, according to this embodiment,
Since there is nothing that protrudes to the outside more than the lower steel pipe 1a, when the large steel pipe 1a and the small steel pipe 1b are connected, the net or the like is not caught. In addition, the upper flange 21 is provided with a reinforcing guide piece 22 having a curved surface projecting outward along the peripheral edge of the upper flange 21 and the peripheral surface of the upper steel pipe 1b. Is further prevented.
Therefore, the net can be quickly lowered in the event of a strong wind, and the steel pipe column will not fall down due to wind pressure.

Further, the upper flange 21 and the lower flange 2
0b connecting bolts and nuts 23
1 is exposed to the upper part and the lower part of the lower flange 20b respectively, so that workability at the time of connection is improved, and
Even if the bolt or nut is damaged, only the necessary one can be easily replaced.

Although the joint between the lower steel pipe 1a in the first stage and the steel pipe 1b in the second stage has been described with reference to FIG. 2, the joint portion between the steel pipe 1b in the second stage and the steel pipe 1c in the third stage is also described. It has a similar structure. In addition, in the present embodiment, the steel pipe column 1 having the three cross-sections has been described, but the present invention is not limited to this, and can be applied to the two-section or the four-section, for example.

[0026]

According to the present invention, the following effects can be obtained.

(1) The lower steel pipe having a large cross section and the upper steel pipe having a small cross section can be connected to each other without providing a projecting member larger than the lower steel pipe, and the net can be prevented from being caught.

(2) Since the bolts and nuts connecting the upper flange and the lower flange are exposed at the upper part of the upper flange and the lower part of the lower flange, respectively, the bolts and nuts for connection can be exchanged and inspected.

[Brief description of drawings]

FIG. 1 is an overall view showing an embodiment of the present invention.

FIG. 2 is a detailed view of a joint portion of the embodiment shown in FIG.

3 is a vertical cross-sectional view taken along the line AA of FIG.

FIG. 4 is a perspective view showing only a joint member.

FIG. 5 is a front view showing a conventional joint structure.

FIG. 6 is a front view showing a conventional joint structure.

[Explanation of Codes] 1 steel pipe column 1a, 1b, 1c steel pipe 2 basic concrete 3 steel pipe pile 4 armrest 5 concrete anchor 6 guide wire 7 net 7a ring 8 pulling wire 9 pulley 10 electric winch 20 joint member 20a base plate 20b lower flange 20c spacer Member 20d Bolt hole 20e Reinforcing plate 21 Upper flange 22 Reinforcing guide piece

Claims (1)

[Claims] 1. In a joint structure for a steel pipe column, wherein an upper steel pipe having a smaller diameter than the lower steel pipe is connected to an upper portion of the lower steel pipe, a base plate having substantially the same outer shape as that of the lower steel pipe is provided at an upper end of the lower steel pipe. A joint member including a lower flange arranged in parallel with the base plate and having a bolt hole on the peripheral surface, and a spacer member formed inside the bolt hole of the lower flange and holding the base plate and the lower flange at a predetermined interval. The upper steel pipe is fixed, and further, a bolt hole corresponding to the bolt hole of the lower flange is formed at the lower end of the upper steel pipe, and an upper flange having the same shape as the lower flange is fixed,
Furthermore, a guide piece having a curved surface that connects the peripheral edge of the upper flange and the peripheral surface of the upper steel pipe and projects toward the outside is provided, and the lower flange of the joint member and the upper flange of the upper steel pipe are brought into contact with each other and bolted. -A steel pipe column joint structure characterized by being connected by nuts.