JP3145951B2 - Support column of ball net - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support column for a ball-proof net installed to prevent a ball from jumping out of an area in a school, a park ground, or around a golf course.

[0002]

2. Description of the Related Art As this type of support pole, there has been a support pole formed of concrete in the same manner as a utility pole. But,
This concrete support column is long (usually 15-20
m), it is difficult to carry it into the installation site. In addition, the installation has a problem that a dedicated large-sized machine is required and the foundation work is also large.

For this reason, in recent years, it is divided into a plurality of pieces and carried in,
The mainstream is made of steel tubes that can be assembled on site.

Conventionally, as this type of steel pipe, as shown in FIG. 7, the ends of steel pipes 11 and 12 are formed in a tapered shape, and the steel pipes 11 and 12 are vertically formed by the tapered portions 11a and 12a.
As shown in FIG. 8, ribs 15 and 16 with ribs are attached to ends of upper and lower steel pipes 13 and 14, respectively. In some cases, the upper and lower steel pipes 13 and 14 are connected by connecting.

In addition, as shown in FIG. 9, a flange 21 is welded to the lower end of the upper steel pipe 19 near the lower end thereof, and the lower steel pipe 2 is welded.
0, a bolt hole 24 with a nut 22 is provided.
In some cases, the outer surface of the upper steel pipe 19 inserted into the inner pipe 0 is pressed to connect and fix the upper and lower steel pipes 19 and 20.

[0006]

The above-mentioned conventional pillars for ball-proof nets, which are made of concrete, have a problem that it is difficult to carry them into or install them on the site as described above.

[0007] In addition, the above-mentioned problems can be solved by connecting and assembling steel pipes, but the upper and lower steel pipes are formed into a tapered shape as shown in FIG. However, there is a problem that the end of the steel pipe has to be machined into a tapered shape with high precision, which requires time and effort and increases the machining cost. Also, in order to work in a tapered shape, the thickness of the steel pipe must be reduced,
There is also a problem that the required strength may not be obtained. Furthermore, in the assembly, it was necessary to force-press the tapered portion using a winch or the like, which required a lot of work. And, even if the forcible press-fitting of the tapered part is performed in this way, due to the diameter change after installation,
There is also a problem that the insertion overlap dimension of the steel pipe gradually increases, and the wire rope stretched between the top of the support column and the ground loosens.

Further, as shown in FIG. 8, a flange is welded to the ends of upper and lower steel pipes, and the flanges are connected to each other with bolts and nuts. Not only is it dangerous to work,
The work efficiency is poor, and a work vehicle for moving the scaffold must be prepared for this work, which raises a problem that the construction cost is increased. Further, after installation, there is also a problem that bolts and nuts connecting the flanges are caught in the net of the net and the net is broken.

As shown in FIG. 9, the upper steel pipe is fixed by a plurality of bolts which are screwed in from the outside of the lower steel pipe to the inner side. I have to screw it in,
There was a problem that the work was troublesome. Further, in this configuration, the load is concentrated on one bolt, the bolt may be broken, or the screw of the bolt or nut may be crushed, and the positioning and holding of the upper steel pipe may not be performed. There was a problem. Further, since the heads of the nuts and bolts protrude to the outside of the support column, there is a problem that the net mesh is caught here and the net is broken.

[0010] It is an object of the present invention to solve the problems of the above-mentioned conventional support columns of the ball-proof net.

[0011]

In order to solve the above-mentioned problems, the invention according to the first aspect of the present invention is a ball-proof net installed on a ground at predetermined intervals and held by wires. In the supporting column for, the supporting column is formed by vertically connecting a plurality of steel pipes having different diameters, and among the steel pipes,
The upper steel pipe has a diameter smaller than that of the lower steel pipe, and a flange is provided at the lower portion in contact with the upper end face of the lower steel pipe, and a positioning member projecting from the outer peripheral surface below the flange is in contact with the inner peripheral surface of the lower steel pipe. The upper steel pipe is fitted and held vertically on the lower steel pipe.

A second aspect of the present invention is characterized in that the positioning member according to the first aspect of the present invention is a protruding piece-shaped liner protruding at an equal interval on the outer circumference of the steel pipe.

According to a third aspect of the present invention, the positioning member according to the first aspect of the present invention is a pair of flanges provided with a predetermined gap above and below.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments.

FIG. 1 is a front view showing an example of installation of a ball-proof net 100 using a support column 1 of the present invention. As shown in the drawing, the support columns 1 supporting the ball net 100 are erected at predetermined intervals on the ground with their lower ends buried in the ground, and intersect at the ground of the adjacent support columns 1 from their respective tops 1a. The supporting wires 1 and 1 are held by a plurality of horizontal wires 9 connecting the supporting columns 1 and 1 to each other in a lateral direction.

The support pillars 1, 1 at both ends (on both the left and right sides in FIG. 1) have their tops 1a connected to the tops 1a of the adjacent support pillars 1 via joint beams 10, respectively. It is held so that it does not fall. In addition, the joint beam 10 is supported by the support columns 1, 1 at both ends.
When a wire (not shown) is stretched outside the, it is not always necessary.

In the present invention, the support column 1 is formed by connecting a plurality of (three in the illustrated example) steel pipes 2, 3, and 4 having different diameters as shown in FIG.
The steel pipes 2, 3, and 4 have a higher rank 2 (or 3) (hereinafter referred to as a higher rank steel pipe) and a lower rank 3 (or 4)
It has a smaller diameter than that (hereinafter referred to as a lower steel pipe) and can be inserted therein. As shown in FIGS. 3 and 4, the lower part 2a (3a) of the upper steel pipe 2 (3)
A flange 5 is provided, and a plurality of protruding liners 6 serving as positioning members are provided on the outer peripheral surface below the flange 5.

The flange 5 has an outer diameter of the lower steel pipe 3.
When the upper steel pipe 2 (3) is larger than the inner diameter of (4) and is inserted into the lower steel pipe 3 (4), the upper steel pipe 2 (3) comes into contact with the upper end surface of the lower steel pipe 3 (4) and is connected to the lower steel pipe 3 (4). ).

The liner 6 has a difference between the inner diameter of the upper steel pipe 2 (3) and the outer diameter of the lower steel pipe 3 (4), that is, the upper steel pipe 2 (3) is connected to the lower steel pipe 3 (4). It has a projecting dimension of about 1/2 of the gap formed when inserted.
The four liners 6 are provided at upper and lower sides at equal intervals around the steel pipe 2 (3). When the upper steel pipe 2 (3) is inserted into the lower steel pipe 3 (4), the outer surface thereof is positioned at the lower steel pipe 3 (4). 3
The upper steel pipe 2 (3) is held in the center of the lower steel pipe 3 (4) in contact with the inner peripheral surface of (4) without any gap.

The ball-proof net 10 of the present invention having the above configuration.
First, the lowermost steel pipe 4 is installed at a predetermined position by embedding the lower end of the lower end of the steel pipe 4 in the ground, and then suspending the central steel pipe 3 serving as a joint by a crane or the like, and lowering the lower end 3a of the lower end of the lower end of the lower pipe 3a. When inserted into the steel pipe 4, as described above, the liner 6 contacts the inner peripheral surface of the lower steel pipe 4 to position and guide the upper steel pipe 3, and then the flange 5 contacts the upper end face of the lower steel pipe 4, whereby the upper steel pipe is contacted. 3 is fitted and held vertically on the lower steel pipe 4. Next, when the upper steel pipe 3 is used as the lower steel pipe 3 and the thinner upper steel pipe 2 is similarly inserted above the lower steel pipe 3, the upper steel pipe 2 is similarly fitted and held vertically on the steel pipe 3.

In this way, the same supporting columns 1 are erected at predetermined intervals on the ground as shown in FIG. 1, and a wire 8 is connected between each top 1a and the ground of the adjacent supporting column 1. The installation is completed by extending the support columns 1 and 1 and connecting the support columns 1 and 1 laterally with the horizontal wires 9.

As described above, the support column 1 of the ball-proof net of the present invention is installed at a predetermined position such as a ground, and is used for mounting the ball-proof net 100.

As described above, the supporting column 1 of the ball-proof net according to the present invention.
Then, the upper steel pipe 2 (3) can be easily assembled simply by inserting the upper steel pipe 2 (3) into the lower steel pipe 3 (4) from above using a crane or the like. The support column 1 has a top 1a.
Is connected to the ground side via the wire 8, the respective steel pipes 2, 3, 4 cannot move upward (in the direction in which the fitting is removed), and the upper and lower steel pipes 2, 3, 4 It is securely held in the state of being fitted and connected.

In the above description, an example is shown in which the three steel pipes 2, 3, and 4 are connected to form the support column 1 of the ball-proof net.
The number of steel pipes to be connected may be appropriately determined according to the height of the support column, the loading conditions, and the like, and may be two or four or more.

In the illustrated example, the annular flange 5
However, the outside of the flange 5 may be inclined downward and extended outward. In this way, it is possible to prevent rainwater from entering from the connecting portion, which is more preferable. Alternatively, a cover member (not shown) may be separately prepared, and the flange 5 may be covered with the cover member.

FIGS. 5 and 6 are a front view and a bottom view, respectively, of a main part showing another embodiment of the present invention. As shown, in this case, a pair of flanges 7, 7 are provided at predetermined intervals above and below as positioning members. The flange 7 has a smaller diameter than the flange 5 provided above and has substantially the same size as the inner diameter of the lower steel pipe 3 (4). Therefore, also in this case, if the upper steel pipe 2 (3) is inserted into the lower steel pipe 3 (4) from above, the flange 5
Is in contact with the inner peripheral surface of the lower steel pipe 3 (4),
(3) acts to position the center of the lower steel pipe 3 (4), and the upper steel pipe 2 (3) is fitted and held vertically on the lower steel pipe 3 (4).

[0027]

As described above, according to the first aspect of the present invention, the support column of the ball-proof net is formed by connecting a plurality of steel pipes having different diameters up and down. It is easy to carry in to the installation site, and by simply inserting the upper steel pipe into the lower steel pipe, the upper steel pipe is fitted and held vertically on the lower steel pipe, so the installation work is also easy,
The construction period can be shortened and the construction cost can be reduced.
Further, unlike the conventional one, the supporting pillar does not expose the connecting bolts and nuts to the outside, so that there are many excellent effects that the net of the ball-proof net is not hooked and the net is not broken. .

According to the second and third aspects of the present invention, a steel pipe for a supporting column exhibiting the effects of the first aspect of the present invention can be realized easily and at low cost.

[Brief description of the drawings]

FIG. 1 is a front view showing an installation example of a ball-proof net using a support column of the present invention.

FIG. 2 is an enlarged view of a support column shown in FIG.

FIG. 3 is a main part front view showing an embodiment of a steel pipe constituting a support column of the present invention.

FIG. 4 is a bottom view of FIG. 3;

FIG. 5 is a main part front view showing another embodiment of the steel pipe.

FIG. 6 is a bottom view of FIG.

FIG. 7 is a sectional view of a main part of a conventional example.

FIG. 8 is a sectional view of a main part of another conventional example.

FIG. 9 is a cross-sectional view of a main part of still another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support pillar 2,3,4 Steel pipe 5 Flange 6 Liner 7 Flange 8,9 Wire 10 Joint beam 100 Ball net

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) E04H 12/00 E04H 12/08 A63B 69/36 522 A63B 71/02 A63C 19/00 F16B 7/20 E04B 1 / 58 503

Claims (3)

(57) [Claims] 1. A supporting column for installing a ball-proof net, which is erected at predetermined intervals on the ground and held by wires, wherein the supporting column is formed by vertically connecting a plurality of steel pipes having different diameters, Among the steel pipes, the upper steel pipe has a diameter smaller than that of the lower steel pipe, and a flange is provided at a lower portion in contact with an upper end surface of the lower steel pipe, and a positioning member that contacts an inner peripheral surface of the lower steel pipe on an outer peripheral surface below the flange. Wherein the upper steel pipe is vertically fitted on and held by the lower steel pipe. 2. The supporting column for a ball-proof net according to claim 1, wherein the positioning member is a protruding liner protruding from the outer periphery of the steel pipe at an equal interval. 3. The support column for a ball-proof net according to claim 1, wherein the positioning member is a pair of flanges provided with a predetermined gap vertically.