JPH07243264A - Safety net having russell-braided structure - Google Patents

Abstract

PURPOSE:To enhance the safety by arranging main meshes formed of a thick yarn for bearing the weight of a dropping one, and auxiliary meshes or small meshes formed of slidable twine yarns for inhibiting the dropping one from passing therethrough, in a single net. CONSTITUTION:Composite yarns 1 are Russell-braided so as to form main meshes 2, and twine yarns 3, 4 and the composite yarns 1 are Russell-braided so as to integrally unite them at braiding points 7, 8 so as to four auxiliary meshes 5. Then, the yarns 3, 4 are slidably and vertically superposed with one another in the centers of the main meshes 5 without being coupled together, and a rope 6 is threaded through the meshes around the net. The lengths L1, L2 of one side of the main and auxiliary meshes are set in the following relationship: 18cm <=L1<=26cm, and 9cm<=L2<= 13cm. Further, the tensile strengths Xkg, Ykg of the yarns 1, 3, 4 are set in the following relationship: X>=215-{(26-L1)X5.90}, Y>= 173--{(13-L2)X9.52}. Further, a synthetic resin process is carried out so as to prevent loosening or the like. Thereby it is possible to efficiently erect the net and to enhance the safety.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention of the present application relates to a safety net installed on a construction site for receiving a human body drop or the like for the safety of work.

[0002]

2. Description of the Related Art Conventionally, as a safety net, a fine mesh net through which a fallen body does not pass has been used. However, since the fine mesh net is formed by a thin thread, the strength may be insufficient, and a thick thread is used. Large mesh nets have been used for reinforcement as a stack. For such a multiple net, it is necessary to stack a large mesh net and a fine mesh net on top of each other for convenience of use to form an integral net. Therefore, not only a plurality of nets are required but also the number of manufacturing steps increases. There is a drawback that the cost increases and the total weight and bulk increase. Furthermore, since a support work is installed at the construction site to support the building materials to be assembled, the safety net must be erected through these support fittings, but it is difficult to erection with a fixed mesh net. There are also problems.

[0003]

SUMMARY OF THE INVENTION According to the present invention, a main net formed of a thick thread for supporting a falling weight on one net and a slidable body for preventing passage of a falling body formed in each main mesh. A small mesh auxiliary mesh made of twain yarn was arranged to catch the fallen body and facilitate the construction of the net.

[0004]

Means for Solving the Problems The present invention provides a “1. a main mesh braided with a composite yarn, and a twain yarn having one side of half the length of one side of the main mesh arranged in this mesh. In a Russell knitting safety net consisting of a braided auxiliary mesh, the twine yarns forming the auxiliary mesh are braided together with the composite yarns forming the main mesh, and the twine yarns are not braided together but at the center of the main mesh or its Safety net having a Russell knitting structure characterized by vertically overlapping and slidably intersecting in the vicinity 2. Length L ₁ of one side of the main mesh braided with composite yarn is 1
8 cm ≦ L ₁ ≦ 26 cm, and the length L ₂ of one side of the auxiliary mesh braided with Twain yarn is 9 cm ≦ L ₂ ≦ 13 cm
A safety net having the Russell knitting structure described in paragraph 1. 3. The composite yarn forming the main mesh is a yarn in which one or more yarns selected from nylon yarns, polyethylene terephthalate yarns, and polyolefin yarns are braided by Russell knitting, and has the Russell knitting structure described in 1 or 2. Safety net. 4. The Twain yarn forming the auxiliary mesh is a yarn obtained by twisting one or more yarns selected from nylon yarn, polyethylene terephthalate yarn, and polyolefin yarn, and the Russell knitting structure according to any one of 1 or 3 Have a safety net. 5. A safety net having a Russell knitting structure according to any one of items 1 to 4, wherein the tensile strength X (Kg) of the composite yarn is X ≧ 215-{(26-L ₁ ) × 5.90}. . 6. The twine yarn has a yarn diameter smaller than that of the composite yarn, and the tensile strength Y (Kg) is Y ≧ 173 − {(13−L ₂ ) × 9.52}. A safety net with a Russell knitting structure. 7. A safety net having a Russell knitting structure according to any one of items 1 to 6 which is resin-processed with a synthetic resin. 8. A safety net having a Russell knitting structure according to any one of items 1 to 7, wherein a rope for fixing the net is arranged through a mesh around the safety net. Regarding

[0005]

One of the features of the present invention is that the safety net has a main mesh braided by the Russell knitting with the composite yarn. The main mesh mainly functions to receive the weight of the falling body.

A second feature of the present invention is that an auxiliary mesh having one side of half the length of one side of the main mesh is arranged in the main mesh. The auxiliary mesh mainly acts to prevent the fallen body from passing through.

The third feature of the present invention is that the main mesh is knitted with the composite yarn, and the use of the composite yarn has an effect that the strength is large and the Russell knitting is easy. In terms of strength, the composite yarn preferably has a denier of 60,000 or more.
The composite yarn referred to in the present invention is a yarn obtained by bundling a plurality of synthetic resin long fibers, for example, multifilaments, monofilaments, etc., and does not twist. The composite yarn may be the same synthetic resin filament or a mixture of plural kinds of synthetic resin filaments.

The fourth feature of the present invention is that the auxiliary mesh is formed of Twain yarn. By using the twain yarn, the twain slidability is good, and the sliding effect of the supporting work is good at the time of erection. It is preferable that the twain yarn has a denier of 20,000 or more.

The fifth characteristic of the present invention is that the auxiliary mesh is raschel knitted with the twine yarn at a substantially intermediate position between the composite yarn forming the main mesh and the side of the main mesh, but the twine yarns are not knitted together. Is. Therefore, the two twain yarns forming the auxiliary mesh are vertically overlapped with each other at a substantially central position of the main mesh but are slidably crossed without being joined to each other. Therefore, the auxiliary mesh is half the length of one side of the main mesh.

The sixth feature of the present invention is to process the net with resin. By processing the resin, it is possible to prevent the yarn from fraying, improve the slippage of the net, and improve the penetration of the support work during erection. As the resin for resin processing, a resin that can be usually used is used, and a water-soluble resin is preferable because it has excellent surface processability of the yarn. Water-soluble acrylic resins, urethane resins, melamine resins, fluororesins and copolymers thereof are preferably used.

The seventh feature of the present invention is that a rope for fixing the net is arranged around the safety net through a mesh. This rope acts to define the size of the net.
The size of the safety net of the Russell knitting is difficult to specify because it stretches, but if the rope is placed through the mesh around the rope, the rope does not stretch, so the size of the net is specified. In addition, the rope acts to secure the safety net to the net support when it is erected.

The safety nets are installed at intervals of about 2 US to ensure the safety of workers. However, in order to prevent the human body from passing through the net when a human body falls, it is necessary for the hemispherical cylinders having both ends of 31 cm to pass through. Most of the time, when a person falls, he or she falls with his / her head down, and since the helmet has a diameter of 31 cm, the mesh should not pass through an object having a diameter of 31 cm. In the case of a square mesh, 31 × π / 4 = 24.3 and a mesh having a side of 24.3 cm are sufficient, but the result of the experiment is that the mesh expands when a shock is applied, and the limit is 21 cm on a side.
On the other hand, the flange of the supporting work has a side of 140 mm to 160 mm and a wall thickness of 6 to 9 mm, and the column tubes or the like for holding them are 60.5 mm to 85 mm, etc. The knitting yarn, which is covered to form the auxiliary mesh, is swung so as to open, and the mesh is widely opened to allow the safety net to be erected. Therefore, the auxiliary mesh must be one through which the supporting metal fittings and the like pass.

When the breaking elongation of the mesh yarn is 65% at maximum, one side of the auxiliary mesh is 24.3 × 1 / 1.65 = 14.75. Considering the safety factor to reliably receive the falling body, 1
The limit is 3 cm. Thus, in the safety net of the present invention, the length of one side of the auxiliary mesh for preventing the fallen body from passing becomes 13 cm. The maximum length of one side of the main mesh where the four meshes of this mesh are arranged is 13 × 2 = 26 cm. The auxiliary mesh has a maximum length of 13 cm on one side, but since the yarn of the auxiliary mesh of the present invention slides, the yarn shifts when the net is swayed when the net is erected, and the auxiliary mesh becomes larger, so that the metal fittings of the supporting work can be passed through. . However, if the mesh size is less than 9 cm, the metal fittings of the support work will not be able to pass through, so the auxiliary mesh has a side L
₂ is 9 ≦ L ₂ ≦ 13 cm, and the main mesh has one side L ₁ of 1
8 ≦ L ₁ ≦ 26 cm.

Next, the tensile strengths of the composite yarn and the twain yarn constituting the net will be described. Tensile strength of composite yarn x (K
g) must satisfy X ≧ 215-{(26-L ₁ ) × 5.90}. According to the standard, the penetration limit mesh yarn strength must be 215 kg when one side of the mesh is 26 cm. Below this, it passes according to experiments. In the equation, 5.90 is a coefficient derived from the experiment. The same applies to the twain yarn, which must satisfy Y ≧ 173 − {(13−L ₂ ) × 9.52}. That is, one side of the mesh is 13c
If it is 173 kg, the fallen body will pass. 9.52
Is a coefficient obtained by an experiment.

The term "supporting work" as used in the present invention refers to a support material for supporting a concrete forming form of a building such as a building, a work such as a tower, a steel frame reinforced concrete structure such as a bridge or a structure of a reinforced concrete structure. When the structure is formed, the supporting work is arranged toward the upper floor, and the safety net is erected on this.

The construction of the safety net of the present invention will be described. At a construction site, a pillar for supporting and holding a building material to be assembled and a pipe for connecting the pillar are combined. These are supporting works, and the safety nets are erected at intervals of a height of about 2 m. However, as described above, since the support work is provided with the top plate and the U-shaped head for supporting and holding the building material, it is difficult to pass the mesh of the safety net. That is, the size of the support plate of the column is 140 mm to 160 mm on a side with a wall thickness of 6 to 9 mm,
The column tube is also a pipe having a diameter of 60.5 mm to 85 mm, and the safety net has to pass through these meshes with its mesh. Moreover, they must be installed one after another as the construction progresses, and they must be able to be easily removed when they are no longer needed.

When the safety net of the present invention is installed, the yarns forming the auxiliary mesh slide against each other to open the auxiliary mesh, so that the support metal fittings can be easily penetrated by covering the net. When the safety element is installed over a large area, it is preferable from the viewpoint of safety to overlap the end portions. When the erection is completed, the net is stretched, the auxiliary mesh is stretched, and even if the net is dropped from above, the net does not become a mesh of 13 cm or more on one side, so the fallen body does not pass.

[0018]

EXAMPLES Next, the present invention will be specifically described with reference to examples.

FIG. 1 is an explanatory view of the safety net of the present invention.
Reference numeral 1 is a composite yarn forming a main mesh. This thread 1 is rassel braided to form a main mesh 2. In this main mesh, two twine yarns 3 and 4 are respectively raschel knitted with the composite yarn 1 and integrally joined at 7 and 8 to form four auxiliary meshes 5. The two twine yarns 3 and 4 forming the auxiliary mesh are not coupled to each other and are slidably stacked vertically in the substantially central portion of the main mesh. 9 is Twain thread 3, 4,
It is the overlapping intersection of. 6 is a rope arranged around the safety net through a mesh. This rope defines the dimensions of the safety net and is attached to the net support during erection to stretch the net.

FIG. 2 shows the safety net of the present invention erected through the support work at a construction site. Reference numeral 10 is a column, and 11 is a pipe connecting the columns. It is understood that 12 is a support top plate, but a top plate larger than the auxiliary mesh is installed so as to penetrate the mesh. In the main mesh of the composite yarn 1, the auxiliary mesh of the Twain yarns 3 and 4 is arranged. Next, a performance test is shown. The net used was a Russell net using nylon thread, the size was 6 m × 6 m, and the mesh was a main mesh with a side of 20 cm and an auxiliary mesh with a side of 10 cm. Net yarn strength Main net-forming net yarn 180.4 Kg Auxiliary net-forming net yarn 144.4 Kg Five nets were used. The safety net used is 6m x 6
m is a Russell net using nylon thread. Five sheets were used in each test.

Test Method The test was conducted under the conditions shown in Table 1.

[0022]

[Table 1]

Test Example 1 Table 2 shows the nets used and the test results.

[0024]

[Table 2]

Test Example 2 Table 3 shows the nets used and the test results.

[0026]

[Table 3]

All have passed the safety standards concerning the structure of the safety net created by the Temporary Industrial Association,
It is clear that it has an excellent effect.

[0028]

Industrial Applicability The safety net of the present invention is easy to install, is efficient, and is excellent in safety, and has a remarkable effect on the safety of workers at the construction site.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the structure of a safety net of the present invention.

FIG. 2 is an explanatory view showing a place where a safety net of the present invention is installed.

[Explanation of symbols]

 1 Composite yarn 2 Main mesh 3 Twain yarn 4 Twain yarn 5 Auxiliary mesh 6 Rope 7 Braiding point 8 Braiding point 9 Twain yarn intersection 10 Strut 11 Pipe 12 Strut top plate

Claims (8)

[Claims] 1. A Russell comprising a main mesh braided with a composite yarn and an auxiliary mesh braided with a Twain yarn having one side of one half of the length of one side of the main mesh arranged in this mesh. In a safety net with a knitting structure, the twine yarns that make up the auxiliary mesh are braided together with the composite yarns that make up the main mesh, and the twine yarns are not braided together and can slide freely vertically at or near the center of the main meshes. A safety net having a Russell knitting structure characterized by intersecting with. 2. The length L ₁ of one side of the main mesh braided with the composite yarn is 18 cm ≦ L ₁ ≦ 26 cm, and the length L ₂ of one side of the auxiliary mesh braided with the Twain yarn is 9 cm ≦ L ₂ ≦
A safety net having a Russell knitting structure according to claim 1, which is 13 cm. 3. The composite yarn forming the main mesh is a yarn in which one or more yarns selected from nylon yarns, polyethylene terephthalate yarns and polyolefin yarns are braided by Russell knitting. A safety net with a Russell structure. 4. The twine yarn forming the auxiliary mesh is a yarn obtained by twisting one or more yarns selected from nylon yarn, polyethylene terephthalate yarn and polyolefin yarn, together. A safety net with a Russell knitting structure. 5. The Russell knitting according to any one of claims 1 to 4, wherein the tensile strength X (Kg) of the composite yarn is X ≧ 215-{(26-L ₁ ) × 5.90}. Safety net with organization. 6. The twine yarn has a smaller diameter than the composite yarn,
The safety net having a Russell knitting structure according to any one of claims 1 to 5, wherein the tensile strength Y (Kg) is Y ≧ 173 − {(13−L ₂ ) × 9.52}. 7. A safety net having a Russell knitting structure according to any one of claims 1 to 6, which is resin-processed with a synthetic resin. 8. A safety net having a Russell knitting structure according to any one of claims 1 to 7, wherein a rope for fixing the net is arranged through a mesh around the safety net.