JP3261461B2 - Safety net device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety net device suitable for use as a long and large-scale fall prevention net or the like which is stretched when a dam dam is constructed.

[0002]

2. Description of the Related Art A fall prevention net device that is stretched when constructing a dam dam will be described. The dam dam has a large scale of several tens meters in height and several hundred meters in length. As a safety measure to prevent the falling of various equipment and materials carried by workers and cable cranes, safety nets are installed on the sides of dam dams as fall prevention nets during construction. The device will be long and large, reaching a length of more than one hundred meters, and such a long safety net will only be able to be extended by using tensioning ropes that have been inserted through both side edges. It is difficult to widen and fix the central part of the net, and it is easy to fluctuate due to wind, etc.In addition, it is necessary to upgrade the refill as the concrete placement of the dike progresses. Kuno trouble, it takes time and effort.

[0003]

In a conventional safety net device, a long elongate structure stretched over a dam dam or the like as described above,
A large-scale safety net device for fall prevention, etc., requires a lot of trouble and labor to erect the safety nets and change the rearrangement thereof, and the central part of the elongated safety net tends to be narrow. There is a problem in the net tensioning performance, the falling object catching performance, and the reliability, such as large fluctuations caused by the wind and the like.

The present invention has been developed in order to solve the above-mentioned problem. The object of the present invention is to increase the width of the safety net by using a net widening holding pipe and to support the net by using an elastic support. An object of the present invention is to provide a safety net device that has improved falling object catching performance and reliability as well as stretching performance.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided a safety net in which an elongate rope is inserted into each side edge of a long safety net, and each end of the elongate rope is anchored to each end. The device comprises a light-weight widening pipe having strong elasticity, and a pair of rope fitting portions provided at both ends of the widening pipe. A net widening holding pipe is provided which is oriented in the width direction of the safety net, and is widened and elastically supported by the safety net by the widening pipe. According to the widening and elasticity of the safety net by the net widening holding pipe, It facilitates the work of refilling safety nets and refilling them, and effectively enhances the performance and reliability of catching falling objects.

[0006]

A rope for tensioning is inserted into each side edge of the safety net formed in a long length, and a lightweight widening pipe having strong elasticity and a net widening holding pipe comprising a rope fitting portion at both ends thereof are provided. Attached to both ropes for installation, oriented in the width direction of the safety net and attached, and each end of the rope for anchoring can be easily installed by anchoring it. The refilling is easily performed, and the stretched safety nets are stabilized in the widened state by the widening and elasticity of the net widening holding pipe, buffer and receive falling objects, and have excellent drop object receiving performance and reliability. can get.

[0007]

1 to 3 show an embodiment of the present invention.
In the figure, reference numeral 1 denotes a relatively long safety net, 2 denotes a tension rope inserted through both side edges of the safety net 1 by appropriate means, and 3 denotes an end of the tension rope 2. anchor,
Numeral 5 is a net widening holding pipe composed of a light-weight widening pipe 6 having strong elasticity and rope fitting portions 7 provided at both ends thereof, 10 is a dam dam, 10a is a downstream slope of the dam dam,
11 is a scaffold (landing) provided on both sides of the dam 10
In the embodiment shown in the figure, a rope 2 for tensioning is inserted into both side edges of a long safety net 1, and a rope 2 for tensioning is used.
In the safety net device, each end of which is anchored by an anchor 3, a light-weight widening pipe 6 having strong elasticity is provided.
And a pair of rope fitting portions 7 provided at both ends of the widening pipe 6. Both the rope fitting portions 7 are fitted to the respective tensioning ropes 2 and directed in the width direction of the safety net 1. Attached,
The safety net stretching apparatus is provided with a net widening holding pipe 5 in which the safety net 1 is widened and supported by the widening pipe 6.

More specifically, the safety net 1 is formed by connecting a plurality of nets in a longitudinal direction by appropriate means as needed, and reaches a length of one hundred and several tens meters corresponding to the dam dam 10 or the like. It is formed into a scale (see FIG. 2), and preferably has a structure in which a ring or the like (not shown) is attached at both ends of the net at appropriate intervals and a rope or the like (not shown) is inserted. A strong wire rope or the like is applied to the tension rope 2, and each end thereof is anchored 3 by an anchor fitting 4. The anchor fitting 4 is composed of, for example, an anchor main body 4a, an anchor bolt 4b, a nut 4c, and the like as shown in FIG. 3, and a plurality of anchors 4 planted on scaffolds (landings) 11 provided on both sides of the dam dam 10. Anchor bolt 4
The anchor main body 4a is fixed with b and the nut 4c, etc.
The anchor main body 4a has a structure in which the fastening portion 2a at the end of the tension rope 2 is detachably anchored.

The pipe 5 for holding the net widening is shown in FIG.
As shown in (A), a light-weight widening material having strong elasticity made of a reinforced plastic (or a plastic or metal of a similar material) preferably manufactured as a composite material obtained by combining a glass fiber as a reinforcing material and a thermosetting resin. It comprises a pipe 6 and a rope fitting portion 7 formed by being fitted to both ends of the widening pipe 6 and fixed by means such as split pins, and the widening pipe 6 preferably has a bending strength of 20 to 60kg / mm
^2, constructed in bending elastic modulus 900~2200kg / mm ^2. As shown in FIG. 1, the rope fitting portion 7 includes a groove 8 formed on the distal end side, a pulley (for example, made of nylon) 9 a pivotally mounted in the groove 8, a drop-off prevention bolt attached to the distal end of the groove 8, The safety net 1 is provided with nuts 9b and the like, and has properties such as light weight, high strength and strong elasticity, and excellent corrosion resistance as a whole.
The safety net 1 is formed so as to be longer than the width of the safety net 1 and has a strong elasticity so that the safety net 1 is widened, elastically supported and held.

In the above-mentioned safety net device, for example, a rope 2 for tensioning is inserted into both side edges of a safety net 1 formed to be long corresponding to a dam dam 10 and a pipe 5 for widening and holding the net. Is installed by fitting the rope fitting portions 7 provided at both ends of the widening pipe 6 to the tensioning rope 2 so that the widening pipe 6 is directed in the width direction below the safety net 1. And attached in a curved state (Fig. 1
B), the appropriate elasticity T is applied to the safety net 1 by its strong elasticity to widen and elastically hold the safety net 1, and further, the net widening and holding pipe 5 is appropriately extended in the longitudinal direction of the safety net 1. The safety net 1 is widened and held over a wide range by a plurality of net widening and holding pipes 5 at the same interval (see FIG. 2), and scaffolds (landings) provided on both sides of the dam dam 10 are provided. 3) Each end 2a of the rope 2, 2 is anchored to each anchor 4 fixed to 11 and the safety net 1 is connected to the dam dam 10.
Is stretched along the slope 10a. In addition, dam dam 10
When the concrete placement of the concrete progresses moderately, the upper scaffold (landing) 1 formed on both sides of the dam dam 10
Each end 2a of the above-mentioned tensioning ropes 2, 2 is replaced with an anchor 3 on each of the anchor fittings 4 fixed to 1, and the safety net 1 is easily refilled and the level is increased as described above. Set up.

As described above, the safety net stretching apparatus of the present invention uses the long safety net 1 to attach the safety net 1 to the slope 10 of the dam embankment 10.
The safety net 1 can be easily stretched along the line a, and a moderate tension T is applied in the width direction of the stretched safety net 1 by attaching a relatively light widening pipe 6 having strong elasticity. The safety net 1 is widened and supported, and the central portion of the safety net 1 is easily widened and fixed easily and effectively. The fluctuation caused by wind and the like is remarkably reduced and stabilized, and the falling object is buffered by the support. And effective reception, and excellent drop prevention performance and reliability are obtained. Further, by changing the anchors of the two ends 2a of the tensioning ropes 2 of the safety net 1 which has been stretched, the safety net 1 can be easily replaced and removable, such as leveling up or removal, can be easily performed. .

[0012]

According to the present invention, a light-weight widening pipe having strong elasticity and ropes at both ends thereof are provided by inserting tensioning ropes into both side edges of the safety net formed long as described above. A net widening holding pipe consisting of a fitting portion is fitted to both ropes to be stretched and oriented in the width direction of the safety net, and is easily stretched by anchors at each end of the rope. At the same time, the replacement of anchors can be easily carried out, such as refilling, so that the stretched safety nets are widened by the net widening holding pipes, stabilized in the widened state by the elastic support, and buffer and catch falling objects. ,
In addition to the net tensioning performance, the falling object catching performance and reliability have been significantly improved.

[Brief description of the drawings]

FIG. 1A is a side view showing an embodiment of a net widening holding pipe according to the present invention, and FIG.
Side view of part X (B)

FIG. 2 is a plan view (A) and a side view (B) showing the entire structure of the safety net device of the present invention.

3A and 3B are a plan view and a longitudinal sectional view, respectively, showing an anchoring state of an end of a tensioning rope.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Safety net 2 Rope for tensioning 3 Anchor 5 Net widening holding pipe 6 Widening pipe 7 Rope fitting part

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A62B 37/00 E02B 7/00 E04G 21/34

Claims (1)

(57) [Claims] 1. A safety net device in which a rope for tensioning is inserted into both side edges of a long safety net, and each end of the rope for tensioning is anchored and tensioned. It consists of a lightweight widening pipe and a pair of rope fitting parts provided at both ends of the widening pipe. Both rope fitting parts are fitted to the above-mentioned tensioning ropes and directed in the width direction of the safety net. A safety net device which is provided with a net widening holding pipe which is attached and supported by expanding the safety net with the widening pipe.