JPH09302581A - Mesh for civil engineering - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a mesh for civil engineering very sparingly having a tendency to be filled with electricity, excellent in a preventing effect on flame propagation and useful e.g. for a reinforcing material for high banking by coating a specific fiber net with an electroconductive substance-containing resin. SOLUTION: This mesh is obtained by coating a fiber net in which strands are placed at preferred intervals in the longitudinal direction 7 and the transverse direction 8 (or the longitudinal direction 7, the transverse direction 8 and the slanting direction 9, 10) and are temporarily fixed, and each mesh of which has 0.01 to 100cm<2> in area, with a resin which is added with an electroconductive substance or an antistatic agent having an action or repressing fire generation and/or self-extinguishing characteristics. It is preferable that a tenacity calculated in terms of 1 meter width of the resin-coated fiber net is >=0.5ton/meter and an elongation at break of a single strand is 0.5 to 30%.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a civil engineering mesh having fire suppression and / or self-extinguishing performance, which is used in the field of civil engineering.

[0002]

2. Description of the Related Art Conventionally, as a mesh used in the field of civil engineering, a mesh used as a high embankment reinforcement, a mesh used as a soft ground reinforcement for beach reclamation, and an erosion of slope ( (Discharge of sediment due to rainfall)
Seeds for prevention and natural greening, vegetation mesh used to improve slope fixing of sprayed soil containing fertilizer, and other special examples include shatterproof nets at blasting sites,
There are rockfall prevention nets and danger prevention nets. Among the civil engineering meshes covered with these resins, relatively many are buried in the soil, but it is customary that they are not provided with a fire occurrence suppressing function and / or a self-extinguishing function. The reason is that many of these meshes, unlike their use in construction applications, are embedded in the soil and used and are completely unrelated to fire. Therefore, the conventional civil engineering mesh does not have a fire suppression function or a self-extinguishing function. For example, a vinyl chloride resin having weather resistance, chemical resistance and flame retardancy is provided with appropriate hardness and softness by adjusting the amount of plasticizer added, and the resin is used for coating fibers to damage the fibers. In addition, it is used as a post-processing agent because it can impart sizing property to fibers. (Actual fair No. 2-1730)

An invention relating to a coated yarn for a network structure, in which a core yarn is coated with a vinyl chloride resin composition (Japanese Patent Publication No. 4-44032). Furthermore, synthetic resin-coated yarns made of synthetic fiber multifilament yarns such as nylon, polyester, etc. having a vinyl chloride coating layer on the surface used for materials for civil engineering and construction such as curing nets, transportation nets, etc. The invention of a net-like woven fabric which is woven as a weft yarn, and in which a plurality of warp yarns or weft yarns are woven with a plurality of the above synthetic resin-coated yarns at narrow intervals to reinforce the entire woven fabric (Saikai 58-65380) Single filament diameter is 50
Conductive spun yarn with electrical resistance of less than μ and electrical resistance of less than 20Ω / cm
A device for antistatic sheets for coal mines in which a flexible flame-retardant film such as a vinyl chloride resin having a light color and a transparent thickness of 30 to 500 .mu.m is provided on one side of a woven or knitted fabric mixed at intervals of 0 cm or less ( There is an actual exploitation number 59-90246).

[0004]

SUMMARY OF THE INVENTION According to the present invention, when the civil engineering mesh is actually used, a fire may occur for some reason during storage at a construction site, and when the civil engineering mesh is laid in the soil during reinforcement of the embankment. There is a case where the end of the reinforced reinforcing material is exposed on the slope and a plant is naturally vegetated there, and the above-mentioned erosion prevention net or spraying net may be exposed in the air. When the civil engineering mesh becomes exposed in this way, the dead mesh burns due to spontaneous combustion, spread of fire from open burning, and abandonment of cigarettes such as mindless drivers and hikers. There is a problem that the fire spreads.

The present invention solves the above problems and provides a fire prevention function and / or a natural fire extinguishing function in which a spark prevention function is added to a danger prevention net for preventing falling objects and scattered objects at a civil construction site. The purpose is to provide a civil engineering mesh that retains sexual function.

[0006]

In order to achieve the above-mentioned object, the first aspect of the present invention is to arrange strands at predetermined intervals in the vertical direction and the horizontal direction, or in the vertical direction, the horizontal direction and the diagonal direction. Civil engineering characterized in that the temporarily fixed fiber network is formed by coating with a resin, and a conductive substance or an antistatic agent having a fire occurrence suppressing function and / or a self-extinguishing function is added to the resin. Is a mesh for

Secondly, the breaking strength of the resin-coated fiber network converted to a width of 1 m is at least 0.5 t / m, and the breaking elongation of one strand is 0.5 to 30%.
The civil engineering mesh according to claim 1, characterized in that

Thirdly, the mesh for civil engineering according to claim 1 or 2 is characterized in that the area of one mesh of the fiber mesh is in the range of 0.01 to 100 cm ² .

If the breaking strength of the fibrous network of the present invention converted to a width of 1 m is less than 0.5 t / m, it cannot be used for civil engineering because of insufficient strength, and the breaking elongation of one strand is 30%. If it exceeds the above range, the elongation is too large, and generally there is no texture in preventing the collapse of the reinforcement target. On the other hand, if it is less than 0.5%, there is no suitable material. The slippery as reinforcement fill is less than the eyes fit area also 0.01 cm ^2/1 stitches fit, because the permeability is lowered as a weak ground reinforcing Te beach reclamation, mesh on the soil reclamation heavy machinery When the soil is sprinkled out, a local depression phenomenon is likely to occur due to earth pressure. The 100 cm ^2/1 stitches fit more than a landfill prevent fall prevention nets and debris leakage of more fit eye soil increases effect is reduced. The preferred range is 0.1-3
0cm ^2/1 stitches is fit. In addition, the strand of the present invention refers to an aggregate (for example, aligned bundle) in which two or more multifilament yarns or monofilament yarns of 100d or more are bundled.
(Twisted yarn bundle, etc.), and preferably 1500 d × 28 or less.

In order to impart a self-extinguishing function, there is a method in which a flame retardant is mixed into the coating resin itself and imparted. In this case, the flame retardant may be a conventional flame retardant used for fibers,
It is not particularly limited, and it may be inorganic or organic. A flame-retardant resin may be added. A flame retardant may be mixed with the refractory resin imparted with higher flame retardancy. As a flame retardant, vinyl chloride resin as an inorganic type, S
b ₂ O ₃ and organic systems include paraffin chloride, tris (2,3-dichloropropyl) phosphate and tris (2,3-dibromopropyl) phosphate. To add a fire suppression function, in order to suppress explosion caused by sparks in an atmosphere filled with flammable gas or flammable dust, a conductive substance in resin or a substance with a function equivalent to this Mix in. The type of the conductive substance or the like is not limited, and may be an inorganic type or an organic type. Further, other than these agents, other agents such as a weather resistance improver may be contained. Although coloring is optional, black is generally suitable.

As a method for suppressing the occurrence of fire, an atmosphere that is easy to catch fire is used.
If static electricity accumulates during use in the air, a large explosion will occur instantly.
Rub In order to prevent this, the coating resin in the present invention has a band
Antistatic agent mixed. Vinyl chloride as this antistatic agent
1.5 to 3 parts of commercially available nonionic antistatic agent
Mix (based on 100 parts of vinyl chloride resin). Also
If the antistatic agent is carbon black fine particles, the resin weight
It is preferable to mix 5 to 20% with respect to the amount. At this time
The resin may be acrylic resin, but vinyl chloride resin is
Desirable for. Also, when the amount of mixture is around 20%, antistatic
Although the effect is enhanced, the resin film strength is reduced. That
Therefore, it is desirable to mix 7 to 15%. For vinyl chloride resin
Even among the types of plasticizers,
Therefore, these may be used. Also, for example,
Antistatic agent for synthetic resin "Chemist series" (SANYO
Yushi Kogyo Co., Ltd. uses a wide range of resins (polyolefins).
Antistatic that can be applied to vinyl chloride, vinyl chloride, ABS resin, etc.)
It is an agent and the addition amount is 0.2 to 30. Wt% may be sufficient. on the other hand
As a self-extinguishing function, it is possible to eat fire spread when unfortunately ignited.
The purpose is to stop. For this reason, the present invention provides a coating resin
A drug that suppresses combustion is mixed therein. With these drugs
For vinyl chloride resin, antimony dioxide (Sb _Two O_Three )
Is suitable. In addition to these, phosphate ester type and halogen-containing
Phosphoric acid ester-based organohalogen phosphorus compounds and tet
There are organic bromine compounds such as labrombisphenol. This
These agents can be mixed with other resins. Vinyl chloride
Resin itself has the property of being difficult to burn, and is suitable for the present invention.
It is.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The network structure used in the civil engineering mesh of the present invention is based on [Fig. 1] to [Fig. 3].
[Fig. 1] is a schematic diagram of a typical example of a weaving weave. The yokosland of (2) is clamped and temporarily fixed by two tatest lands of (1), and then an antistatic agent, a flame retardant, and a flameproofing agent. Is impregnated and coated with a resin containing In addition to this weave weave, irregular weave weave and mosh weave may be used.

[0013]

[Figure 1]

FIG. 2 is an example of a mesh knitted by a weft insertion Russell machine. (4) Tatest Land
It is constructed by being inserted into the chain knitting of (3), and the yokostland of (5) is inserted into the chain thread at intervals as required. Both are temporarily fixed and then impregnated and coated with a resin. This weft insertion Russell knitting is an example, and knitting structures other than this may be used.

[0015]

FIG. 2

[FIG. 3] is an example of a structure having vertical, horizontal, and nanamese strands, which is produced by a multi-axial insertion Russell machine, and includes (7) tatest land, (8) in chain yarn of (6). Yokosuland of (9) and (10) Naname strand are inserted and temporarily fixed, and then impregnated and coated with resin. Although illustration is omitted, a triaxial woven mesh similar to [FIG. 3] and composed of yokosland and nanamestrand is also included in [FIG. 3].

[0017]

FIG. 3

[0018]

[Example] Using a weft insertion warp knitting machine, an assembly obtained by aligning 5 polyester multifilaments (1000d) at 2.5 cm intervals in the vertical direction, and 5 polyester multifilaments (1000d) similar to each other The twisted yarns of 40 times / m are arranged at 2.5 cm intervals in the horizontal direction, and the bundles in the vertical direction are polyester multifilament yarns (2
It was inserted and fixed by a loop insertion method with a loop made by the chain stitch of 50d). Also, the bundles in the horizontal direction are fixed at 2.5 cm intervals with one loop of the chain knitting described above (Fig. 2). Then, 3 parts of antistatic agent (Resisto 141) (Daiichi Kogyo Seiyaku) was added to 100 parts of vinyl chloride resin (plasticizer mixed) paste.
Part, Sb ₂ O ₃ , 2.5 parts were mixed, and the above mesh was dipped, squeezed and set at 180 ° C. to form a film.

[0019]

COMPARATIVE EXAMPLE 1 A mesh-like knitted fabric similar to that of the example was dipped in a resist 141 and a vinyl chloride resin (containing a plasticizer) containing no Sb ₂ O ₃ added thereto, squeezed, and then set at 180 ° C.

[0020]

[Comparative Example 2] The same mesh-like knitted fabric as in the example was dipped in an acrylic resin to which the register 141 and Sb ₂ O ₃ were not added, squeezed and set at 180 ° C. Fire suppression and self-extinguishing functions of the meshes of the above three examples were measured and evaluated by flame retardancy and volume resistance value.

[0021]

[Table 1] <Flame retardancy evaluation method> FMVSS No. 302 for vehicles is used because there is no flame retardancy evaluation method for civil engineering. <Measurement method of volume resistance> High Resistance Meter 4329A manufactured by Yokogawa Hewlett Packard Co. is used. It is generally known that the chargeability becomes extremely small when the volume resistance value is 10 12 ^-11 (Ω / cm) or less. If it is 10 ¹⁰ or less, the antistatic effect is good. Therefore, the present invention has a sufficient effect, can be used for static electricity removal in the presence of a flammable substance, and has a flame spread-preventing effect in a range in which it is self-extinguishing.

[0022]

EFFECTS OF THE INVENTION As shown in [Table 1], the present invention has an effect of preventing fire spread in the range of self-extinguishing flame retardancy.
Further, the volume resistance value is 10 ^{9 -10} (Ω / cm), which is a generally accepted volume resistance value of 10 12 ^-11 or less, the chargeability is extremely small, and the antistatic effect is large. Therefore, the present invention has a large effect of preventing the spread of fire in the place where a combustible substance exists.

[Brief description of drawings]

FIG. 1 is a representative example of a persimmon weave used for a civil engineering mesh of the present invention.

[Fig. 2] Russell structure knitted on a weft insertion Russell machine.

FIG. 3 is a multiaxially inserted tissue having vertical, horizontal, and nanamest strands.

[Explanation of symbols]

 1, 4, 7. Tatest Land 2, 5, 8. Yokosland 3,6. Chain thread 9,10. Nanamestrand

Claims (3)

[Claims] 1. A fiber network formed by arranging strands at predetermined intervals in the vertical direction and the horizontal direction or the vertical direction, the horizontal direction and the longitudinal direction and temporarily fixing the resin net is covered with a resin, and a fire occurs in the resin. A civil engineering mesh, comprising a conductive substance having a suppressing function and / or a self-extinguishing function or an antistatic agent added thereto. 2. The breaking strength of the resin-coated fiber network converted into a width of 1 m is at least 0.5 t / m,
The breaking elongation of one strand is 0.5 to 30%, and the mesh for civil engineering according to claim 1. 3. The area of one mesh of the fiber mesh is 0.0
It is in the range of 1 to 100 cm ^2.
Or the civil engineering mesh according to 2.