KR20010000519A - Parallel safety net - Google Patents

Abstract

PURPOSE: A safety net installed horizontally is provided to prevent an accident caused by a falling material by having excellent tension and shock intensities, to protect a worker, and to be used in a wide range by saving production costs. CONSTITUTION: A safety net consists of a multi-filament and is horizontally installed. Some of the multi-filament is made up of polypropylene and the rest of the multi-filament is made up of synthetic fiber including nylon, polyethylene, polyester and tire cord. Accordingly, an accident is prevented by obtaining the excellent tension and shock intensities of the safety net.

Description

Safety screen installed horizontally {PARALLEL SAFETY NET}

The present invention relates to a safety bat installed horizontally in order to prevent a safety accident occurring during the height operation at the construction site. More specifically, it relates to the material of the mesh of the safety bat.

In order to protect pedestrians from falling objects such as lumber, boards and tools at construction sites, and in extreme cases to prevent accidents caused by falls of workers working at heights, the safety net (below " Safety guards installed horizontally ”). This horizontal safety bat must not be torn by the fall of falling objects, must have adequate elasticity to absorb shock, and the horizontal safety bat must be inexpensive because it is almost impossible to recycle. Requirements must be met. In other words, the safety net must have high tensile strength and impact strength and low production cost.

Until now, the fiber widely used as a safety batting mesh installed horizontally is nylon in foreign countries, and polyethylene in Korea.

Nylon mesh, which is mainly used in foreign countries, has been widely used in terms of good tensile strength and impact strength. However, nylon is weak to ultraviolet rays, and therefore additional processes such as dyeing processes are required to prevent side effects due to exposure to ultraviolet rays. . However, the dyeing process can cause environmental pollution, and even after the dyeing process, nylon has a sagging property. Thus, in some cases, a deflection control device for additionally preventing the deflection is required for the support portion. In addition, since nylon is expensive, production costs increase.

Polyethylene mesh, which is mainly used in Korea, has a lower tensile strength than nylon, but is widely used at construction sites because of its low price. However, polyethylene has a problem in that the impact strength that can absorb the shock is very low, so that a strong impact such as a fall of the aerial worker may not be able to withstand the impact and cause a large accident.

Application No. 18350/2000 (the name of the invention: horizontally installed safety bat made of polypropylene multifilament yarn) discloses a horizontally installed safety bat made of polypropylene. Polypropylene, which is a polymer of propylene, is a kind of thermoplastic resin, and has a relatively low specific gravity (about 0.9) and a resin that is superior in impact resistance (impact strength) and tensile strength to polyethylene. However, the safety bat made of polypropylene monofilament yarn has a problem that the tensile strength and impact resistance is weak, and to solve this disadvantage is to use a multi-filament yarn of polypropylene.

The present invention supplements the safety bat made of multifilament yarns of the polypropylene as part of the multifilament yarns are polypropylene, and the rest of the filament yarns are horizontally installed safety fibers made of nylon, polyethylene, polyester and tire cord yarns. It's about bats.

It is an object of the present invention to provide a new horizontally installed safety bat devised to solve the problems of the conventional horizontally installed safety bat.

Another object of the present invention is to provide a safety bat installed horizontally with excellent tensile strength and impact strength.

It is another object of the present invention to provide a fireproof horizontally installed safety bat.

The above and other objects are horizontally installed safety batting mesh made of multifilament yarns, a part of the multifilament yarns of the polypropylene material, the remaining filament yarns nylon, polyethylene, polyester and tire cord yarn It can be achieved by providing a horizontally installed safety bat with a synthetic fiber comprising the material.

1 is a specific example of manufacturing a safety net mesh installed horizontally using a knitting machine,

Figure 2 shows a safety net mesh used horizontally manufactured in the knitting machine,

Figure 3 is an installation example of the falling object prevention net using the safety net of the present invention,

Figure 4 shows an installation example of the fall protection network using the safety net of the present invention.

The present inventors install horizontally using a mesh made of a multifilament yarn having a part of multifilament yarn made of polypropylene and the remaining filament yarn having a synthetic fiber including nylon, polyethylene, polyester and tire cord yarn as its material. It was found that the tensile strength and the impact strength are excellent when the safety bat is manufactured.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is an enlarged photograph showing a specific example of manufacturing a safety net mesh installed horizontally using a knitting machine. Nylon filament yarn 102 is wound around the first bar 101a of the seven bars that hang on the knitting machine, and polypropylene filament yarn 103 is wound around the bars 2-7b 101b-101g. They are manufactured by the knitting machine for safety net according to a conventional method.

However, in the above embodiment, bar 1 is composed of nylon. It will be apparent to one of ordinary skill in the art that the nylon can be positioned at any one of the seven bars, and that one to three bars can be used as the nylon. In addition, it will be apparent to those skilled in the art that various fibers including polyethylene, polyester, and tire cord yarn may be applied instead of nylon.

Figure 2 shows the safety batting mesh of the present invention manufactured in a knitting machine (Figure 2a is the front of the mesh, Figure 2b is the rear of the mesh). As shown in Figure 2, the horizontal mesh installed for safety nets manufactured in the knitting machine has a Rassel structure, the length of the mesh can be properly adjusted, it is preferable to adjust within the range of about 1-5 cm. . More preferably 2-4 cm. If the length of the mesh is too long, the tensile strength and the impact strength are lowered, and if the length of the mesh is too short, the manufacturing cost becomes expensive and its utility is reduced.

Figure 3 shows a part of the multi-filament yarn is a polypropylene material, the rest of the horizontally installed safety bat, including a mesh having a nylon or polyethylene as a material, specifically an example of the installation of the fall prevention net. The falling object prevention net 301 is installed obliquely on the outer wall of the building under construction by the support member 302 and the connecting member 303, and prevents a safety accident caused by falling objects at the construction site.

Figure 4 is a part of the multifilament yarn is made of polypropylene material, the rest is a horizontally installed safety fence, specifically a fall protection network 401 including a mesh having a nylon or polyethylene as the material It is shown.

The horizontally installed safety bat of the present invention is more preferably flameproofed. Examples of the flame retardant used for the flame retardant include a phosphorus flame retardant and a bromine flame retardant, but a phosphorus flame retardant is more preferable.

Example

Example 1

Polypropylene fiber and nylon were applied to a knitting machine to manufacture a safety net, and then a safety net installed horizontally was used. The tensile strength of the safety guard installed horizontally was measured by the following method. The specimens of the batting yarn were cut from the mesh forming the batting, and the tensile test speed was performed within the range of 15 cm / min-30 cm / min. The measured mean value was 80.5 kgf. These measurements were found to be much higher than the minimum allowable strength (60 kgf or more) specified in the safety standards and to have sufficient tensile strength for use in horizontally installed safety nets.

Example 2

Using a mesh prepared in Example 2 was prepared a safety bat installed horizontally in the size of 3 m × 3 m. The impact strength (deceleration) was measured using the prepared safety bat in the following manner. Using the hanging rope, the four corners of the test bat and the center of each side were connected to the running tools of the fall test facility. A weight having a constant weight (usually 90 kg) was dropped from the support of the bat at 2.25 m to the center of the bat to measure the deceleration of the weight. The measured deceleration showed a value of 10 or less, which is significantly lower than the value required by the safety standard (15 or less), demonstrating that the safety material of polypropylene multifilament yarn has a significantly improved shock absorption capacity. do.

Example 3

Polypropylene fiber and polyethylene fiber were applied to a knitting machine to manufacture a safety net, and then a safety net installed horizontally was used. Tensile strength and impact strength thereof were carried out in the same manner as described in Examples 1 and 2, and values of 76.5 kgf tensile strength and deceleration 10 or less were obtained. Therefore, it can be seen that the mesh of the present invention is sufficient to be used as a safety net.

Some of the multifilament yarns are made of polypropylene, and the other filament yarns are horizontally installed safety nets including meshes made of multifilament yarns made of nylon or polyethylene. There is an advantage that can prevent a safety accident, and can ensure the safety of the heights workers. In addition, the production cost is low, there is an advantage that can be widely used as a safety screen (fall prevention net or fall protection net) for the construction site.

In addition to the above advantages, there is an advantage that the risk of fire can be reduced by flame retardant to the safety bat with a flame retardant.

Claims (3)

Some of the multifilament yarns are made of polypropylene and the rest of the filament yarns are horizontally installed, including a mesh made of multifilament yarns having nylon or polyethylene as the material. The horizontal safety net of claim 1, wherein the mesh is manufactured in a knitting machine, and the mesh has a rassel structure. The safety net installed horizontally according to claim 1 or 2, wherein the mesh is flameproofed.