JP2004183173A - Biodegradable bag for civil engineering work - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a biodegradable bag for civil engineering work, exhibiting large strength and durability in the holding of a heavy filled material and the pull-up of the bag in the case of embedding in the ground for the consolidation of the foundation in civil engineering work and recovering the original natural environment after the lapse of a definite period to achieve the desired purpose. <P>SOLUTION: The bag is made of a biodegradable fiber yarn (b) having a strength of ≥4cN/dtex, a Young's modulus of ≥40cN/dtex and an elongation at break of 20-40% and the strength of the net is ≥2.5cN/dtex. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

なお、表中、☆：優良 ○：可 ×：不可 を示すものである。
【００２４】
【発明の効果】
前述のように本発明は、編網に適した生分解性繊維素材を用いることにより、編網時の工程通過性が容易となり、網傷、欠点に無い網地が得られるようになった。
また、この網地を組み立てた根固め工法用袋材を用いることにより、割石、割栗石、コンクリート塊等を袋詰めに充填した状態での吊上げ・吊下げにも十分な耐久性のある生分解性土木工事用袋体を得ることが出来、施工後においても、地球環境に配慮した土木資材を提供することが出来た。
【図面の簡単な説明】
【図１】本発明に関する一実施例の生分解性土木工事用袋体に中詰め材を充填した状態で一部を破断して示す正面図である。
【図２】図１における生分解性土木工事用袋体の作成過程を示す要部の説明図である。
【図３】図１における生分解性土木工事用袋体を示す斜視図である。
【符号の説明】
１…ネット．ｂ…糸[0001]
[Industrial applications]
The present invention is applied to a biodegradable civil engineering work which is formed of a net made of biodegradable fiber, and is used by packing and filling crushed stone, split rock, concrete lumps, etc. in civil engineering works such as shoring and revetment revegetation. Regarding the bag.
[0002]
[Prior art]
Conventionally, members used for civil engineering works such as revetment revegetation greening work, consolidation work, backfilling of earth retaining walls, etc. are stored in bags made of synthetic resin fiber such as polyethylene, cobblestone, split stone, split stone, concrete blocks, etc. What has been filled with the filling material of is used.
[0003]
This member is, for example, backfilled to the ground after performing the above-mentioned civil engineering work such as revetment greening, so that even after the purpose of the above-mentioned consolidation is achieved, the bag material for this consolidation method is underground. However, the roots of the plants grown in the revetment have a drawback that the residual sacks prevent further root growth.
[0004]
On the other hand, in order to solve this drawback, attempts have been made to create a bag material for a root consolidation method using a net made of a biodegradable material. The problem is that the yarn is cut in the knitting process and the netting cannot be obtained due to insufficient performance, or the netting with sufficient strength cannot be obtained even if the knitting mesh comes out. There was a point.
[0005]
[Problems to be solved by the invention]
The present invention has been made to solve the above problems, and uses biodegradable fibers having a yarn strength of 4 cN / dtex or more, a Young's modulus of 40 cN / dtex or more, and a cutting elongation of 20 to 40%. With the strength of the netting being 2.5 cN / dtex or more, it can be used for embedding in the ground for the foundation of civil engineering works, etc., when holding or lifting heavy filling materials. It is an object of the present invention to provide a biodegradable civil engineering construction bag capable of exhibiting high strength and returning to nature after achieving a purpose after a certain period of time.
[0006]
[Means for Solving the Problems]
Means of the present invention for achieving the above-mentioned object,
A biodegradable civil engineering construction bag using a biodegradable fiber having a raw yarn strength of 4 cN / dtex or more, a Young's modulus of 40 cN / dtex or more, and a cutting elongation of 20 to 40%.
[0007]
Also,
The strength of the mesh is 2.5 cN / dtex or more.
[0008]
【Example】
Next, an embodiment of a biodegradable civil engineering bag according to the present invention will be described with reference to the drawings.
1 and 3, A is a biodegradable civil engineering bag A according to an embodiment of the present invention, which is used in civil engineering works such as revetment revegetation greening work, consolidation work, or backfilling of retaining walls. 1, a filling material 2 to be filled in the inside of the net 1, a bottom tie rope 3 for preventing a bottom-out during filling of the filling material 2, a site after filling of the filling material 2, etc. , And is basically constituted by a lifting rope 4 used for lifting or lowering the whole, and a tying rope 5 for binding the middle filling material 2 from the upper part of the net 1 so as not to spill.
The above-mentioned biodegradability means that it is decomposed into water and carbon dioxide by natural microorganisms or decomposing enzymes after use or after a predetermined age at which the purpose is achieved, and returns to the natural world. is there.
[0009]
The net 1 in the biodegradable civil engineering construction bag A is knitted into a knotless net type or the like by a raw yarn b made of a biodegradable fiber material. For example, as shown in FIG. 2A, the base material 6 is formed in a horizontally long rectangular shape, and the length direction of the base material 6 is rounded about an axis orthogonal to the center, and FIG. As shown in FIG. 5, the cylindrical net 1 is formed by joining both ends (ears) 6a and 6b of the base material 6 in the longitudinal direction.
When a knitting net is used and a net having a cylindrical shape is used by using a seamless machine, it is not necessary to fold the net and connect the ears.
[0010]
The cylindrical net 1 is folded from the upper and lower intermediate portions m, and the net 1 is folded so that one net end 1a is matched with the other net end 1b.
In this net 1, as shown in FIG. 3, a bottom tie rope 3 is attached to a lower portion thereof, a lifting rope 4 is attached to an upper end portion thereof, and a mouth tie rope 5 is provided above the net 1. . It should be noted that the bottom strapping is performed in advance such that the strapping portion of the bottom strapping rope 3 is located inside the bag.
The ropes 3, 4, and 5 may be passed through any structure, but it is necessary that the ropes 3, 4, and 5 have a structure that does not easily come off.
[0011]
The biodegradable fiber material used for the net 1 may be a raw fiber b of any biodegradable fiber such as polycaprolactone, polybutylene succinate, and polyglycolic acid, in addition to natural degradable fibers such as cotton and hemp. However, it is necessary to satisfy the performance described below and not to impair the process passability at the time of knitting.
[0012]
Inside the net 1, for example, a backhoe or the like is used to fill a filling material 2 such as a split stone, a split stone, a concrete block, and the like, so that the filling material 2 does not spill outside. When the shackle is performed by using 5, as shown in FIG. 1, a bag A for a biodegradable root consolidation method is obtained.
[0013]
The biodegradable yarn b used for the knitting net of the net 1 has a strength of 4 cN / dtex or more, a Young's modulus of 40 cN / dtex or more, and less than 150 cN / dtex. The elongation must be 20 to 40%.
When the performance of the biodegradable fiber is in the above range, a net 1 having a netting performance excellent in strength performance, shock absorption, and bending fatigue can be obtained.
The above-mentioned cN / dtex is a unit indicating the strength of the original yarn b.
The above-mentioned Young's modulus is a constant obtained from the relationship between the elongation and the force when the raw yarn b is pulled.
[0014]
When the strength of the raw yarn b is less than 4 cN / dtex, the net 1 having a sufficient netting strength can be obtained even if the yarn breaks during knitting or the knitting comes out. Absent.
[0015]
When the Young's modulus is less than 40 cN / dtex, only the net 1 with weak netting strength can be obtained. Conversely, if the Young's modulus of the biodegradable fiber exceeds 150 cN / dtex, the net 1 becomes hard, and disadvantages such as poor bending fatigue and abrasion resistance occur.
[0016]
Further, when the elongation at break is less than 20%, not only yarn breakage is apt to occur during knitting, but also the shock absorbing property is obtained even when the biodegradable civil engineering construction bag A is lifted or lowered after knitting. Gets worse.
On the other hand, when the elongation at break exceeds 40%, a disadvantage occurs in that the net strength is reduced.
[0017]
The biodegradable civil engineering work bag A according to the embodiment of the present invention has a strength capable of being lifted and hung after the middle packing material 2 having a weight of 2 t or 4 t is packed into the net 1. If it does, Russell net, knotless net, frog or net, regardless of any knitting method such as character net, regardless of the strength in use, durability, considering the strength, or excellent elongation, A knotless net or a Russell net is preferred.
[0018]
That is, if the strength of the net 1 knitted by a knotless net or a Russell net is equal to or more than 2.4 cN / dtex, the net 1 can be formed even when the middle filling material 2 having a weight of 2 t, 4 t, or the like is packed. The strength is less than 0.4 cN / dtex, which is 1/6 cN / dtex or less, a safety factor of 6 times is secured, and the load applied to the net 1 used for the biodegradable civil engineering construction bag A is a fiber. No permanent elongation strain occurs and no fatigue occurs.
[0019]
On the other hand, if the strength of the net 1 is less than 2.4 cN / dtex, the biodegradable civil engineering work bag A is hung and fatigue occurs when performing the hanging work. After the bag A is installed, the plants grow sufficiently, and before the role of the biodegradable civil engineering bag A for rooting work is achieved, a net break occurs and the biodegradable civil engineering work is performed. The performance of the bag A cannot be satisfied.
Or, when the netting strength as the net 1 is extremely low, there is a danger that a net break occurs when the biodegradable civil engineering construction bag body A is lifted or hung, and the packing material 2 spills from the net 1, There is a danger of injury, accident or the like during the work at the civil engineering site, and the performance of the biodegradable civil engineering construction bag A is insufficient.
[0020]
In addition, the bottom tie rope 3 and the tie rope 5 used in the net 1 of the embodiment of the present invention are also required to have the ability to biodegrade in the soil or after construction, after fulfilling the role of consolidation work or the like. It is necessary to use a rope made of a biodegradable fiber material, and it is necessary to have such a property that the middle filling material 2 does not easily come off due to the breakage or elongation of the rope during lifting, hanging, and installation.
Also, when the lifting rope 4 is required to have a function of biodegrading after performing a role of consolidation after construction, it is necessary to use a rope made of a biodegradable fiber material.
When the lifting rope 4 is removed after the construction of the biodegradable civil engineering bag A, the lifting rope 4 does not need to use a biodegradable fiber material. Each of them has a rope strength exceeding a safety factor of 6 times or more the weight for filling and filling the biodegradable civil engineering construction bag A with the filling material 2 having a weight of 2t, 4t or the like. Need to be.
[0021]
Next, a plurality of examples and comparative examples according to the present invention will be described, and the examples and comparative examples will be compared.
The biodegradable civil engineering construction bag A of the above-mentioned Example of the present invention was knitted and assembled under the conditions of Example 1, Example 2 and Comparative Example 1, and the net strength was measured.
In addition, the biodegradable civil engineering construction bag body A was filled with 2 t of broken stones as the actual filling material 2, and the durability was checked when the lifting and the lowering were repeated four times, and the netting was actually performed. The applied load was measured, and it was confirmed whether or not the biodegradable civil engineering bag A was a durable material.
The test results are shown in Table 1 below. At the same time, confirmation was made on the processability during knitting and the presence or absence of yarn breakage.
[0022]
(Example 1)
A knotless knitting machine using a polylactic acid fiber having a raw yarn strength of 4 cN / dtex, a Young's modulus of 80 cN / dtex and a cutting elongation of 35% as a raw yarn b of a biodegradable material, and having a total fineness of 20,000 denier And knitting was performed. After the obtained net 1 is folded and formed into a double structure, a lifting rope 4, a tying rope 5, and a bottom tying rope 3 are attached to the netting, and the biodegradable civil engineering bag according to the embodiment of the present invention. A was obtained.
(Example 2)
A knotless knitting machine using a polylactic acid fiber having a raw yarn strength of 5 cN / dtex, a Young's modulus of 85 cN / dtex and a cut elongation of 30% as the raw yarn b of the biodegradable material, so that the total fineness is 20,000 denier. And knitting was performed. After the obtained net 1 is folded and formed into a double structure, a lifting rope 4, a tying rope 5, and a bottom tying rope 3 are attached to the netting, and the biodegradable civil engineering bag according to the embodiment of the present invention. A was obtained.
(Comparative Example 1)
Knotless knitting mesh using polylactic acid fiber having a raw yarn strength of 2.5 cN / dtex, a Young's modulus of 30 cN / dtex and a cutting elongation of 57% as a raw material of a biodegradable material, and having a total fineness of 20,000 denier Knitting was performed using a machine. After the obtained net 1 is folded and formed into a double structure, a lifting rope 4, a tying rope 5, and a bottom tying rope 3 are attached to the netting, and the biodegradable civil engineering bag according to the embodiment of the present invention. A was obtained.
[0023]
Table 1 shows the passability of the bags of the above Examples and Comparative Examples and the results of lifting and hanging tests.

In the table, ☆: excellent ○: acceptable ×: unacceptable
[0024]
【The invention's effect】
As described above, according to the present invention, by using a biodegradable fiber material suitable for a knitting net, the process passability at the time of the knitting net is facilitated, and a net without scratches or defects can be obtained.
In addition, by using the bag material for the root consolidation method assembled with this netting, biodegradation that is durable enough to be lifted and hung while bagged with quarry stone, split rock, concrete blocks, etc. It was possible to obtain a civil engineering construction bag, and to provide civil materials in consideration of the global environment even after construction.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a front view of a biodegradable civil engineering construction bag according to an embodiment of the present invention, partially cut away with a filling material filled therein.
FIG. 2 is an explanatory view of a main part showing a process of producing the biodegradable civil engineering bag in FIG.
FIG. 3 is a perspective view showing the biodegradable civil engineering bag in FIG. 1;
[Explanation of symbols]
1 ... Net. b ... thread

Claims (2)

A biodegradable civil engineering construction bag characterized by using a biodegradable fiber having a raw yarn strength of 4 cN / dtex or more, a Young's modulus of 40 cN / dtex or more, and a cutting elongation of 20 to 40%. The biodegradable civil engineering bag according to claim 1, wherein the strength of the mesh is 2.5 cN / dtex or more.

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