JPH0754252A - Land net - Google Patents

Abstract

PURPOSE:To obtain a net for building and land, capable of having both of characteristics of vertically stretched protective net and characteristics of safety net. CONSTITUTION:This land net is constituted so that short legs and long legs may alternately be continued in knitting direction and simultaneously, network shape when stretched in width direction may be triangular. Further, the relationship between the long leg 2 (a) and the short leg 1 (b) satisfies the formula 8>(a/b)>1.1. The net is composed of a raschel net or a knot net or a knotless net.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a land net, and more particularly to a land net used for safety nets, curing nets, golf nets, ball nets, windproof nets, leisure fence nets, fence nets and the like.

[0002]

2. Description of the Related Art Traditionally, nets used as land nets and curing nets are mainly quadrilaterals such as diamonds, squares, rectangles, etc. The structure uses a Russell net, a knotted frog net, a no-knotted net, and the like. In particular, since the curing net is stretched on the frame by so-called vertical stretching, the rhombic mesh causes looseness and is difficult to stretch. For this reason, the purpose is to make a square stitch and to sew so that the mesh has a square shape.

Further, other golf nets, windproof nets, and ball-proof nets also use Russell nets, knotless cross nets usually called knotless nets, and knotted frog or nets. Also, the corners were sewn and stitched so that the mesh had a square shape.

The above Russell net is a net knitted by a vertical knitting machine. In addition, Yutobushi frog or net,
The net has a nodule at the intersection, and the shape of the nodule resembles that of a frog. In addition, the knotless net is a net in which a knotted net is usually used to make a rhombic net by repeating crossing while applying a yarn.

[0005]

Generally, the safety net may be in the shape of a rhombus for the purpose of catching and protecting the human body when a person falls from a high place. Moreover, since it is stretched with a slight slack in order to absorb the impact at the time of dropping, it does not need to be a square shape, and may be a rhombus shape.

[0006] However, the curing net needs to have a square shape in order to make it stretched vertically, and if it is not a square shape, slack occurs when the net is stretched and it cannot be stretched neatly.
For this reason, it is necessary to purposely perform the corner tailoring so that the mesh has a square shape.

The rhombus shape and the corner shape will be described with reference to FIG. FIG. 4A shows a rhombic net, and the net 51 fixed to the support rope 50 has a rhombic shape. Therefore, if a force is applied in the vertical or horizontal direction,
The mesh is deformed. Therefore, no matter how they are fixed, it is difficult to spread them in a netted form. On the other hand, in the square mesh shown in FIG. 4 (B), the mesh 52 attached to the support rope 50 has a square mesh. Therefore, even if the mesh is pulled in the vertical and horizontal directions, the square mesh is maintained. You can Generally, in order to make a square-shaped net, a rhombus-shaped net is cut into a bias, and so-called square-shaped tailoring is performed, and the mesh is attached to a support rope.

As described above, the land net is widely used. For example, a curing net, a fence net, a ball-proof net, a golf net, and the like are better in product value and more advantageous in performance when they are spread tightly in the corners. On the other hand, in order to absorb the impact or soften the impact of the falling object, the rhombic mesh may be more advantageous.

In particular, when it is used as a safety net, life saving is a major role, and not only does the net not break due to the impact when the human body falls, but also the space between the dropped human body and the net. It is important to soften the impact and soft land.

In addition, a safety net used for construction work must receive all falling objects, and even if small objects such as bolts and nuts drop, these objects drop to the ground. It is necessary to have a fine structure that can prevent this.

However, if the shape of the net and the tailoring method are changed depending on the application, not only the work becomes complicated, but also the production efficiency deteriorates significantly. The present invention has been proposed in view of the problems of the above-described conventional technology, and an object thereof is for construction and land use that can have the characteristics of a vertical curing net and the characteristics of a safety net. It is to provide the net.

[0012]

In order to achieve the above object, according to the invention described in claim 1, when short legs and long legs are alternately continuous in the knitting direction and are extended in the width direction. It is characterized in that the land net is constructed so that the mesh shape of is a triangle.

Further, in the invention described in claim 2, the land net according to claim 1, wherein the relationship between the long leg (a) and the short leg (b) is 8> a / b> 1. It is characterized by being 1.

Further, in the invention described in claim 3, the land net according to claim 1 or 2, wherein the structure of the net is a Russell network, a knotted frog or a knotless net. Is characterized by.

[0015]

According to the first aspect of the present invention, the leg continuous in the knitting direction is composed of the long leg and the short leg having a length shorter than the long leg, and the leg is short in the knitting direction. The legs and long legs are alternately continuous. Therefore, when this land net is extended in the width direction, the mesh shape has a pair of short legs that are adjacent in the width direction as the bottom side, and the long legs that go from this bottom side to the next bottom side in the knitting direction are the sides. It becomes an isosceles triangle that is an edge.

According to the second aspect of the present invention, the relationship between the short leg and the long leg forming the mesh is regulated. With such a mesh shape, it is possible to form a mesh shape that can sufficiently satisfy the performance required as a land net, such as weight, strength, and air permeability.

According to the third aspect of the invention, the net can be formed by various knitting methods without forming the net by a special knitting method.

Therefore, the land net according to the present invention is
By extending the knitted net in the width direction without changing the net shape or tailoring method depending on the application, it is possible to combine the characteristics of the vertical curing net and the characteristics of the safety net, and for construction and land. It is possible to provide a net for use.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 are explanatory views showing a structure of a land net according to the present invention, and FIG. 1 (A) shows knitting of a land net knitted by vertical knitting, knot frog knitting, and knotless knitting. FIG. 1B shows a mesh shape of FIG.
The figure which showed the mesh shape at the time of extension of the land net shown in (A), FIG. 2 (A) is the enlarged view of the mesh shape at the time of knitting, FIG.
FIG. 3B is an enlarged view of the mesh shape at the time of extension, and FIG. 3 is an example of a knitting structure diagram when the present invention is applied to a Russell net. In the figure, 1 and 2 show the legs of the net, 1 is a short leg, 2
Is a long leg. Further, 3 indicates an intersection or a knot of the legs.

In all conventional nets such as the Russell net, the knotted net and the non-knotted net, the mesh-shaped leg portions have substantially equal lengths, and particularly in the land net, the length of each leg portion is long. Were the same. This is because if the lengths of the legs are different, the mesh shape becomes distorted when the mesh is developed.

On the other hand, in the land net according to the present invention, as shown in FIG. 1, the conventional point of view is completely changed so that the lengths of the leg portions which are continuous in the knitting direction are made different from each other, and A mesh is formed by the long legs 2. That is, the short leg 1 part having the same length is knitted in the lateral direction in the lateral direction, and the short leg 1 part and the long leg 2 part are knitted alternately in the full width. .

Since the short leg 1 is shorter than the long leg 2 in the above net as shown in FIG. 1 (B), the net can be expanded up to the length of the short leg 1 by maximally expanding the net in the width direction. become. Therefore,
Since there is the adjacent short leg 1 in the deploying direction of the short leg 1, the short legs 1 adjacent in the width direction are stretched in a substantially straight line shape.

On the other hand, since the long leg 2 is longer than the short leg 1, the long leg 2 is not sufficiently developed and the differential development of the length with the short leg 1 cannot be completed. Therefore, the long leg 2 also has the adjacent long leg 2 in the deploying direction as in the case of the short leg 1, but the long legs 2 adjacent in the width direction are not linear because they are not fully deployed. Instead, it becomes a zigzag pattern of diagonal lines with the intersection 3 of the short legs 1 as the bending point.

As a result, an isosceles triangle is formed in which the two short legs 1 are one base and the two long legs 2 are equal sides. In this way, when the net is developed in the width direction with respect to the net-raising direction of the net, the length of the short leg 1 corresponding to the number of stitches becomes the width of the net and is fixed.

In the net constructed as described above, the knitted net is unfolded in the width direction without tailoring the usual diamond net to the square direction, thereby continuously producing knits having a desired width. be able to.

The mesh shape of the land net according to the present invention will be described in more detail with reference to FIG. The mesh shape when knitting is quadrilateral as shown in FIG. 2 (A),
The mesh shape when developed in the width direction becomes a triangular shape as shown in FIG. That is, a pair of adjacent short legs 1 and short legs 1 are combined to form the base of an isosceles triangle,
The long legs 2 and 2 are the sides of the isosceles triangle. The shape of this isosceles triangle has a larger space as it is larger, and the larger the ratio between the short leg 1 and the long leg 2, that is,
When the length of the short leg 1 is b and the length of the long leg 2 is a,
As / b increases, the angle of the side angle of the isosceles triangle decreases, resulting in a vertically long net having a high density in the width direction.

The inventors of the present invention conducted experiments and studies on the length and ratio of the sides of the triangle formed by the short legs 1 and the long legs 2, that is, the relationship between the angle of the triangle and the net performance. It has been found that an optimum net as a land net can be provided when the ratio of the lengths of the long leg 2 and the long leg 2 satisfies the following relationship. 8> a / b> 1.1 a = length of long leg b = length of short leg

That is, when the ratio a / b of the short leg (b) 1 and the long leg (a) 2 is 1.1 or less, the mesh shape becomes laterally long when unfolded and the air permeability is poor, so that the mesh Performance was not good for the heavy weight. On the contrary, when the ratio a / b of the short leg (b) 1 and the long leg (a) 2 was 8 or more, the mesh shape became vertically long when deployed, and effective performance could not be obtained. Therefore, the ratio between the short leg 1 and the long leg 2 is
It is necessary to satisfy the equation 8> a / b> 1.1.

The triangular land net is most preferably formed by a Russell net machine, but it may be a knotted frog or a net or a knotless net.

FIG. 3 shows a mesh structure when the land net according to the present invention is constituted by a Russell network. The Russell network, usually, and the front thread of L _3, L _4,
It is composed of L ₈ , L ₆ and L ₇ , L ₅ back yarns. As in FIG. 2, 1 and 2 indicate the legs of the net, 1 is the short leg, and 2 is the long leg. Further, 3 indicates an intersection of the legs.

The raw yarn material used in this construction is nylon, tetron, polypropylene, vinylon, polyvinylidene, etc. Either multifilament or monofilament material may be used, and high tension polyarylate yarn may be used. Ultra high-strength fibers such as high-strength polyethylene yarn and super-aramid yarn may be used.

The land net according to the present invention, which has a triangular mesh, is preferably a tate knitting net, that is, a Russell net, but a knotted knitting machine (commonly known as a frog) or a knotless knitting machine is used. It may be created using. In this case, the net can be easily manufactured by changing the speed of the feed roller for knitting.

In the land net of FIG. 3, the Tetoron 1450D-192FiL raw yarn manufactured by Toray Industries, Inc. is used for the front and back, and the number of stitches in the width direction is 130, the length of the short leg 1 is 13 mm, and the length is 13 mm. A case where a land net having a length of 200 m is created by using a Russell knitting machine with a rhombus net having a length of the leg 2 of 26 mm will be described.

When this net was spread in the width direction, the width was 3
It became a net with a length of 38 cm and a length of 113 m. In this net,
Since it is not necessary to connect the pieces by tailoring them like the conventional rhombus net, you can cut the net to the desired length and attach the support ropes to the four corners to use it as a safety net. It was

In the drop test, the tensile tension of one leg of this net was 55 kg. And the diameter of the falling object is 3
Assuming that the weight is 10 mm and the weight is 90 kg, the number of threads of the safety net for receiving the falling object is 310 in the width direction.
mm / 22mm = 14, diagonally (310mm /
20mm) × 2 = 31, (14 + 31) × 5
It can support a falling object with a weight of 5 kg = 2475 kg.

On the other hand, in the case of the safety net of the conventional diamond mesh, if the same calculation as above is carried out, the number of threads is (310 mm /
15 mm) × 2 = 41.33, assuming that the tensile tension of one leg is 50 kg, a falling object with a weight of 2066.6 kg can be supported.

Therefore, it is apparent that the land net of the present invention is stronger than the conventional net. Further, since the land net according to the present invention is not a rhombic net, it does not deform freely in the vertical and horizontal directions, so that the appearance is beautiful even when the net is stretched.

Next, according to the structure of the land net shown in FIG. 3, polypropylene multi 136 manufactured by Ube Nitto Co., Ltd.
A case where 0D-120FiL raw yarns are used for the front and back and knitted with a Russell knitting machine will be described.
Here, a land net having a length of 100 m was created with a number of meshes of 200, a length of the short leg 1 of 10 mm, and a length of the long leg 2 of 17 mm.

This net was heat-set with a 120 ° C. dry heat setter and expanded in the width direction, and as a result, a net having a width of 400 mm and a length of 53 m was produced. When reinforcing ropes were attached to this net and stretched over the park as a fence net, there was no seam due to the joints made by the square-shaped mesh like a normal diamond mesh, the appearance was beautiful, and the construction was easy. there were.

[0040]

As described above, the land net according to the present invention has the following advantages as compared with the conventional diamond mesh because the mesh shape is triangular. 1) When unfolding in the width direction, there is no difficulty in fixing because the extension in the width direction becomes large like a diamond mesh, and the width is fixed by the total number of short legs. To be done. Therefore, it is not necessary to consider the fixing in the width direction by making the corners, and it is possible to significantly reduce the labor of the tailoring.

2) Since the mesh shape is triangular when unfolded, a large total area for preventing falling objects can be taken. Therefore, it is possible to make a light net having a low density. For example, in order to prevent passage of a building bolt having a diameter of 15 mm, a mesh having a quadrangular mesh needs a length of 15 mm on one side, a total area of 225 mm ² , and a thread length (density) of 60 mm in total circumference. However, in the case of a mesh having a triangular mesh shape, the length of one side is 26 mm, and the total area is 290
Since it is possible to use a net having a large mesh size of mm ² and a total circumferential length of 78 mm, the net weight can be reduced. Further, from another perspective, the landing net according to the present invention has a higher blocking rate than the diamond net.

3) The legs running diagonally in the knitting direction are
Because it runs in a zigzag instead of a straight line like a square mesh,
Since the shock absorbing force when the force is applied in that direction, that is, the so-called toughness is large, it is possible to withstand the shock and soften the shock to the falling object. That is, in the conventional mesh, since both warp and weft are connected by a straight line,
The impact force of the falling object concentrates on the fixed portion of the rope, but in the land net according to the present invention, the yarns forming the net run in a zigzag manner, so that the impact force can be dispersed. Therefore, the effect is particularly great in the safety net for receiving the fall of the human body.

4) The land net according to the present invention can be fixedly attached not only as a safety net for receiving a fallen object but also as a curing net commonly referred to as vertical tension, so that these can be shared by one type of net. Therefore, it is not necessary to use a net of a completely different standard as in the prior art, and the number of hand-held products can be reduced, so that the storage cost can be saved. Furthermore, since it is not necessary to make corners, cut loss is eliminated and tailoring costs can be significantly reduced.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a configuration of a land net according to the present invention, and FIG. 1 (A) shows a warp knitting, a knot frog knitting,
The figure which shows the mesh shape at the time of knitting of the land net knitted by knotless knot, and FIG. 1 (B) is the figure which showed the mesh shape at the time of extension of the land net shown in FIG. 1 (A).

FIG. 2 (A) is an enlarged view of a mesh shape when knitting,
FIG. 2B is an enlarged view of the mesh shape during extension.

FIG. 3 is an organization chart when the present invention is applied to a Russell network.

FIG. 4 is an explanatory view showing a conventional net, FIG. 4 (A) is a diagram showing a rhombus-shaped net, and FIG. 4 (B) is a diagram showing a square-shaped net.

[Explanation of symbols]

1 short leg 2 long leg 3 intersections or nodules L _3, L ₄ the front yarn _{L 5, L 6, L 7} , L 8 back yarn 50 supporting ropes 51 nets of diamond-th network 52 square eyes shapes of

Claims (3)

[Claims] 1. A land net, wherein short legs and long legs are alternately continuous in the knitting direction and the mesh shape when extended in the width direction is triangular. 2. The land net according to claim 1, wherein the relationship between the short leg and the long leg satisfies the following equation. 8> a / b> 1.1 a = length of long leg b = length of short leg 3. The land net according to claim 1 or 2, wherein the structure of the net is a Russell network, a knotted frog or a knotless net.