JPH0811866B2 - Surface drainage material and its manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a planar drainage material for guiding moisture in the ground to the surface of the earth for drainage and a method for producing the same.

[Conventional technology]

The planar drainage material used for backfill drainage such as tunnels, grounds, slopes, etc. forms a groundwater passage in the ground and collects water from surrounding rocks into the passage to guide it to the surface. Has the role of draining.

A conventional sheet drainage material is a core material made of a plate-shaped resin fiber aggregate having a predetermined thickness in which resin fibers are randomly gathered and covered with an uncloth cloth.

[Problems to be solved by the invention]

However, the conventional surface drainage material has a difference in density due to the aggregate of resin fibers in each part of the core material, and the earth pressure resistance strength of the rough part is smaller than that of the dense part, and it is buried in the ground. In addition, the compression deformation width due to earth pressure became extremely large in the rough part, the gap between the resin fibers became narrow, and it was not possible to secure a sufficient water passage area in that part, and the bending strength was not so large. Therefore, it was easy to deform into a drooping shape in the middle part of the internal water passage due to the load such as earth pressure, so that there was a problem that the drainage capacity deteriorated early after construction.

Further, the conventional surface drainage material has various problems in automating all the production processes, and there is also a problem in that some production processes have to be manually performed and productivity is low.

The present invention solves the above problems and provides a planar drainage material that can ensure uniform earth pressure resistance strength in each part by devising the configuration of the core material and that does not easily cause the internal water passage to droop. The purpose is to Another object of the present invention is to improve the productivity of a planar drainage material that has uniform earth pressure resistance and is resistant to sagging of the internal water passage.

[Means for solving problems]

Means for the surface drainage material taken to achieve the above object is a synthetic resin core material formed by arranging a plurality of meandering filaments in parallel with an outer skin material having water permeability, The curved portion of the loop portion is wider than the base end portion and is heat-sealed to the outer skin material.

Further, the means for the method of manufacturing the planar drainage material is such that two outer skin material feeding paths that are provided to be opposed to each other with a space therebetween and gradually extend from the upper end portion to a predetermined intermediate portion. By narrowing and maintaining the same or substantially the same spacing in each part below the intermediate predetermined part, while continuously feeding the outer skin material to each of these feeding paths, the molten synthetic resin is interposed between the outer skin materials. A large number of filaments are continuously fed in parallel, and the top of the curved portion of the filament is fed to each of the two feeding paths by causing the filament to meander at the upper end of the feeding path. The outer skin material is alternately heat-sealed, and the top portion of the curved portion is flatly crushed while the outer skin material is fed along the entire length of the feeding path to form a loop portion.

[Work]

When the sheet-like drainage material having the above-mentioned configuration is buried in the ground, the water that has passed through the outer skin material and entered the inside of the sheet-like drainage material is formed by a gap between a large number of filaments to form an internal water passage. Flowing through. Further, a large number of loop portions of a large number of filaments are juxtaposed to act as a rib for reinforcing the core material. Furthermore, since the curved portion of each loop portion is wider than the base end portion, the mutual spacing between the curved portions is very small when the loop portions are arranged between a group of loop portions that act as reinforcing ribs. The supporting area of the outer skin material by the loop portion is increased accordingly.

Further, according to the method for manufacturing the above-mentioned surface drainage material, the outer skin material fed into each of the two feed paths gradually approaches from the upper end portion of the two outer skin material feed paths to a predetermined intermediate portion, and The tops of the curved portions of the many filaments, which are meanderingly supplied between the outer skin materials, are gradually flattened. Then, the curved portion of the loop portion formed by crushing the curved portion is heat-bonded linearly to the outer covering material.

〔Example〕

FIG. 1 is a schematic perspective view in which a part of a planar drainage material according to an embodiment of the present invention is cut away, where 1 is a core material and 2 is a skin material. The core material 1 is constructed by meandering a synthetic resin net having a lattice-like mesh along the warp threads 3, and the curved portion R ₁ in the loop portion R of the warp threads 3 shown in FIG. The outer skin material 2 is heat-sealed. Also,
The width dimension H ₁ of the curved portion R ₁ is the base end portion of the loop portion R.
The width of R ₂ is larger than H ₂ . Therefore, the adjacent curved portions R ₁ and R _{1 of} the same warp yarn 3 are close to each other, and the distance therebetween is substantially the same as the width dimension H ₂ of the base end portion R ₂ . Further, as shown in FIG. 3, the warp yarns 3 are arranged in high density at very narrow intervals, while the weft yarns 4 are arranged at relatively wide intervals.

If the surface drainage material has a width of 30 to 50 cm and a length of 1 to 4 m, it is easy to handle during storage, transportation and construction. As the synthetic resin forming the core material 1, for example, a thermoplastic resin such as a high-density polyethylene resin, a polypropylene resin, or a polyvinyl chloride resin can be preferably used. A material having water permeability such as a non-woven fabric, a woven fabric, or a net having a fine mesh is used for the outer cover material 2. However, it is necessary that the outer cover material 2 has a heat fusion property with respect to the core material 1. When those materials are synthetic resins having compatibility with the core material 1, or when mainly composed of materials having no compatibility with the core material 1, resins having compatibility with the materials. For example, it is necessary to mix a resin of the same system as the core material 1 in advance.

According to such a surface drainage material, a large number of loop portions R are arranged in parallel to form an assembly of loop portions R ... And each of the curved portions R ₁ of the loop portions R forming the assembly is a skin. Since the material 2 is heat-sealed, the aggregate functions as a reinforcing rib of the core material 1. Therefore, when a planar drainage material is used for backfill drainage such as a tunnel or a gland, if a water flow gradient is given in the longitudinal direction of the aggregate, a tunnel-like shape formed by the aggregate of loops R or It becomes difficult for the groove-shaped internal water passage 5 to be crushed or drooped down by earth pressure, and the moisture collected inside through the outer skin material 2 is smoothly drained through the internal water passage 5. It Nevertheless, the planar drainage material is easily bent at each part in the direction orthogonal to the longitudinal direction of the above-mentioned assembly, and fits well to the unevenness of the ground. Here, if the core material 1 is made of a synthetic resin net as in the embodiment, the loop portions R forming the aggregate are integrated through the weft threads 4, In addition to further promoting the action of the aggregate as a reinforcing rib, there is an advantage that deformation such that the upper surface and the lower surface of the planar drainage material are relatively laterally displaced can be suppressed as much as possible. Further, when some of the weft threads 4 are arranged on the top of the loop portion R and the weft threads 4 are heat-sealed to the outer covering material 2 together with the curved portion R ₁ of the loop portion R, such an advantage is obtained. It will become more prominent. Further, the earth pressure applied to the face material drainage material is taken up by a large number of loop portions R, but in the loop portion R, the curved portion R ₁ is wider than the base end portion R ₂ ,
Since the curved portions R ₁ and R ₁ of the loop portion R are close to each other between the adjacent aggregates, the sagging due to the earth pressure of the outer cover material 2 between them is stopped to a minimum. Therefore, the inner water passage 5 is also restricted from being narrowed by the hanging down of the outer cover material 2. In this regard, for example, when the loop portion R as in the fourth diagram is configured chevron becomes narrower closer to the top portion, adjacent loop portions R, the interval of the curved portions R _1, R ₁ of R Is widened, and the sagging width of the outer cover material 2 due to earth pressure is correspondingly increased. In FIG. 4, a state in which the outer skin material 2 hangs is shown by an imaginary line, and a direction in which earth pressure acts is shown by an arrow A. The waterway 5 became much narrower than it was originally,
It becomes impossible to maintain good drainage performance.

In the case of sheet-like drainage materials used for draining tunnels, glands, and slopes, a high-density polyethylene resin net is used as the core material 1, and the thickness of the warp threads 3 and the weft threads 4 is 0.5 to 2.0.
If the number of mm and warp yarns 3 is set to about 50 to 250, deformation due to earth pressure does not occur so much and sufficient body earth pressure strength and bending strength can be secured.

Next, a method for manufacturing a sheet drainage material according to an embodiment of the present invention will be described.

Fig. 5 shows the skin materials 2, 2 sent to the two skin material feeding paths.
A state in which the filamentous material 6 made of molten synthetic resin is being fed into the space is shown. In the figure, 7 is an extruder die,
8 is a skin material guide roll, 9 is a skin material narrowing roll, 10
Is a pinch roll. The two outer skin material feeding paths are provided at predetermined portions in the middle from the upper end portion (the outer skin material narrowing rolls 9, 9).
The interval is gradually narrowed up to the part where the is installed), and the interval is maintained the same or substantially the same in each part below the intermediate predetermined part. The outer cover materials 2, 2 are continuously fed into each of the above-mentioned feed paths, and are constantly pulled with a constant tension while passing through the feed paths. A large number of filaments 6 are continuously extruded in a parallel state from the die 7, and they are continuously fed between the skin materials 2, 2. By making the filamentous material 6 meander at the upper end of the feeding path, the tops of the curved portions R ₁ of the filamentous material 6 are alternately applied to the outer skin materials 2 and 2 respectively fed to the two feeding paths. Heat seal. The filamentous material 6 heat-sealed to the outer skin materials 2 and 2 in this manner has a curved portion as the space between the outer skin materials 2 and 2 is gradually narrowed as the outer skin materials 2 and 2 are fed downward.
R ₁ is flattened to form a loop R. Also,
The filamentous material 6 extruded from the die 7 is cooled and hardened in a shower 11, 11 or the like at a predetermined portion, cut into a predetermined flow after hardening, and further completely covered with the outer skin material 2, 2.

When the filamentous material 6 is meandered at the upper end of the outer skin material feeding path, the curved portion R ₁ of the filamentous material 6 is located at a position immediately before the outer skin material 2, 2 is separated from the outer skin material guide rolls 8, 8. It is desirable that the filamentous material 6 be bent by contact with the filamentous material 6, and by doing so, the outer covering materials 2 and 2 are not pushed by the filamentous material 6 and do not escape, and the top of the curved portion R ₁ of the filamentous material 6 is It is surely heat-sealed to the outer skin materials 2, 2. Further, by simultaneously moving the outer skin material guide rolls 8 and 8 by the same width when the curved portion R ₁ comes into contact with the outer skin materials 2 and 2, the curved portion R ₁
When the outer skin material guide roll 8 around which the outer skin material 2 is in contact with is released to the outside of the contact portion, the filaments 6 meander reliably and smoothly. Outer skin guide roll 8 in this case,
The moving widths H, H of 8 are the extrusion speed and viscosity of the filamentous material 6, the skin material 2,
It should be decided as appropriate in consideration of the feeding speed of 2 and the distance of the outer material feeding path. On the other hand, when the curved portion R ₁ of the filamentous body 6 is flatly crushed, the curved portion R ₁ is heat-sealed to the outer skin materials 2 and 2 over a certain width, and the outer skin materials 2 and 2 and the filamentous body 6 are separated. Will surely be integrated.

In this embodiment, the filament 6 is extruded from the die 7. However, a net may be extruded instead of the filament 6, and in this case, the sheet drainage material described in FIGS. To be A thermoplastic resin such as a high-density polyethylene resin, a high-density polypropylene resin, or a high-density polyvinyl chloride resin can be used as a material for the filament 6 or the net, and a nonwoven fabric, a woven fabric, A material having water permeability such as a net having a fine mesh can be used, and when the material of the outer cover material 2 is mainly a synthetic resin that is not compatible with the filament 6 or the net, It is necessary to mix a compatible resin into the material, for example, a resin of the same system as the material of the filament 6 or the net.

〔The invention's effect〕

As described above, in the sheet drainage material of the present invention, a synthetic resin core material in which a large number of meandering filaments are arranged in parallel is covered with a water-permeable outer skin material, and the loops of the filaments are formed. Since the curved portion of the portion is wider than the base end portion and is heat-sealed to the outer cover material, the assembly of a large number of loop portions in the parallel state acts as a reinforcing rib to form the core material. Since it reinforces and makes it difficult for the internal water passage to hang down, good drainage performance is maintained over a long period of time. In addition, the interval between the curved parts in the adjacent assembly is very narrow, and there is also an effect of suppressing the sagging of the outer covering material due to earth pressure to the minimum limit, and this effect is combined with the effect as the above-mentioned reinforcing rib to provide good drainage performance. Is more effectively maintained.

Further, according to the method for producing a planar drainage material of the present invention, it becomes possible to automate all the production steps of the planar drainage material that exhibits the above-described action, and the productivity is improved.

[Brief description of drawings]

FIG. 1 is a schematic perspective view in which a part of a planar drainage material according to an embodiment of the present invention is cut away, FIG. 2 is a vertical sectional front view showing an enlarged main portion thereof, and FIG. 3 is a vertical sectional side view showing an enlarged main portion thereof. FIGS. 4 and 5 are vertical sectional front views showing a main part of a planar drainage material as a comparative example, and FIG. 5 is a configuration diagram for explaining a manufacturing method according to an embodiment of the present invention. 1 ...... core material 2 ...... outer covering, 3 ...... warp, 6 ...... filament, R ...... loop portion, the curved portion of the R ₁ ...... loop portion, R ₂ ...
… Base part of loop, H ₁ …… Width of curved part, H ₂ …
... Width of the base end.

Claims (2)

[Claims] 1. A synthetic resin core material comprising a large number of meandering filaments arranged in parallel is covered with a water-permeable outer skin material, and the curved portion of the loop portion of the filamentous material is substantially the same as the base portion thereof. A planar drainage material having a width or a width wider than that and being heat-sealed to the outer skin material. 2. The two outer skin material feeding paths extending downward at a distance from each other gradually narrow the distance from the upper end to a predetermined intermediate portion, and at each portion below the intermediate predetermined portion, The intervals are maintained the same or substantially the same, and while continuously feeding the outer skin material to each of these feeding paths, a large number of filamentous bodies made of molten synthetic resin are continuously arranged in parallel between the outer skin materials. And the meandering of the filament at the upper end of the above-mentioned feeding path, so that the tops of the curved portions of the filament are alternately heat-sealed to the outer skin material sent to each of the above-mentioned two feeding paths. A method for manufacturing a planar drainage material, characterized in that a top portion of the curved portion is flatly crushed to form a loop portion while the outer skin material is fed through the feeding path.