JPS63214315A - Filtering medium for drainage and its manufacture - Google Patents

Abstract

PURPOSE:To secure good drain properties for a long time and prepare a filtering medium of superior durability for drainage by stitching up a covering layer with synthetic yarns together with a water permeating layer in the longitudinal direction continuously at the lap-joining section on the surface of the water permeating section. CONSTITUTION:In a filter medium A for drainage, a covering layer consisting of an exterior net 4 of synthetic resin and a water permeating sheet 3 constituted of fiber intertwined sheets or the like are applied outside a water permeating layer 1 of good drain properties in the surface direction constituted of a plurality of superposed comparatively large mesh synthetic resin nets 2. Also, the both ends of said covering layer are lap-joined from the left and right sides on the surface of the water permeating layer 1, and at the lap-joined section 5, the whole of said covering layer and said water permeating layer 1 are stitched up with strong synthetic yarns such as nylon yarns or the like in the longitudinal direction continuously. As a result, good drain properties are secured for a long time and the filtering medium A for drainage of superior durability can be prepared.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a mat-shaped drainage filter material used for drainage on the back side of tunnel walls, drainage on the back side of retaining walls and block walls, drainage in roadbeds and embankments, etc. The present invention relates to a manufacturing method thereof.

[Prior art and its problems] As this type of drainage filter material, there is one using a synthetic resin net that is easy to handle in am, is flexible, can easily adapt to the shape of a wall surface, and has excellent corrosion resistance and pressure resistance.

For example, by overlapping multiple sheets of coarse synthetic resin net made by cross-fusing linear strands,
It is known that this net layer is sandwiched between fine fiber entangled bodies for filters, and the outside thereof is covered with a synthetic resin net. (Utility Model Publication No. 52-23850). This drainage filter medium is fixed in the above-mentioned combination state by partially adhering using an adhesive or by means such as thermocompression bonding, but because of the partial adhesion, it lacks integrity and has problems in terms of strength. There is also a filter for it! ! If the miscellaneous bodies are simply stacked above and below the internal net, there is a risk that earth and sand may enter the internal net from the sides.

Therefore, the fiber entangled body for the filter and the outer net are wrapped and wrapped on the outside of the multiple net layers so that they are pressed together on one side, and the joined parts of the wrapping layer are separated at required intervals using a stapler or the like. It has been put into practical use in which it is bonded to and fixed in an enveloped state.

However, in the above case as well, since the joints are made partially at fairly large intervals, there is a risk that earth and sand may enter the internal net layer between the unjoined joints and impede drainage. Stress tends to concentrate at the joints made by staples (stables), and when external forces are applied during transportation, construction, etc., or when buried in the soil, the joints may come undone or the enveloping layer may be damaged. There is a high risk that the outer net or fiber entanglement will be damaged at the joint.
Furthermore, when used in moist soil, the metal staples corrode, reducing binding strength and making them more likely to come off. For this reason, forces in various directions may act in the soil due to soil compaction, etc., and the shape of the filter medium in the soil tends to collapse, and if the shape collapses, drainage performance will be impaired.

In addition, in the production of the drainage filter media, the inner and outer nets and fiber entangled bodies are cut into predetermined lengths according to the filter media to be produced, and the work of overlapping the inner net and the outer net and the 1111 entangled body are performed. Wrapping work and fixing work using staplers, etc. are performed, and products can only be manufactured to a preset length, and it is difficult to align the ends. Furthermore, the above work requires manual labor, making the manufacturing time-consuming. This makes it expensive.

In view of the above, the present invention provides an extremely excellent drainage filter material that is free from the risk of detachment of the bonded joints of the exterior net or damage to the net, has good water resistance and shape retention, and has no risk of dirt getting inside. Furthermore, it is an object of the present invention to provide a manufacturing method that allows the filter medium to be manufactured easily and efficiently.

[Means for Solving the Problems] The drainage filter medium of the present invention which solves the above-mentioned problems has a water-permeable layer formed by a relatively coarse synthetic resin net or the like so as to have drainage properties in the longitudinal direction. A water-permeable sheet made of an intertwined sheet of synthetic fibers and an exterior net made of synthetic resin are sequentially wrapped around the outside as a covering layer, and both end portions are pressed together on the surface of the water-permeable layer. It is characterized in that at least the covering layer is sewn continuously in the longitudinal direction at the meeting portion with synthetic thread.

The second invention relates to the above method for producing a filter medium for drainage, in which a long exterior net material made of synthetic resin and having a width slightly wider than the circumference of the filter medium to be manufactured is coated with a A water-permeable sheet material such as a long synthetic fiber intertwined sheet with approximately the same width is layered, and on top of that a water-permeable layer material made of a long synthetic resin net etc. with a width corresponding to the filter medium to be manufactured is layered. While feeding the exterior net material and the water-permeable sheet material in the horizontal direction, turn the both end portions of the exterior net material and the water-permeable sheet material to the upper surface side of the water-permeable layer along the enveloping guide, and then wrap the net layer between the exterior net material and the water-permeable sheet material. At the same time, the both end portions are pressed together on a water-permeable net layer, and subsequently, at least the covering layer is sewn continuously in the length direction at the joined portion using a synthetic sewing machine, and then a predetermined length is sewn. It is characterized by cutting into.

[Function 1] According to the drainage filter medium of the present invention having the above-described configuration, since at least the above-mentioned enveloping layer is sewn continuously in the longitudinal direction with synthetic yarn at the meeting part of the covering layer, the meeting part are held in a mating state over their entire length, thereby protecting a water-permeable sheet such as a tangled sheet of synthetic fibers that acts as a filter from external pressure, and also holding the mating portion of the sheet from opening. It is possible to effectively prevent earth and sand from entering the internal permeable layer between the joints. In addition, the water-permeable layer made of a coarse net inside can be well maintained, and the water-permeable layer has voids for drainage, and water in the soil penetrates into this water-permeable layer through the water-permeable sheet. and is flushed out in the longitudinal direction.

In addition, since the seamed part is sewn over the entire length of the meeting part with synthetic thread, it has excellent water resistance, does not suffer from corrosion even when used in humid soil, and has sufficient joint strength. Moreover, the force acting on the joint is not localized, and the net does not easily come off or break.

According to the above manufacturing method of the present invention, the water permeable layer material such as a long synthetic resin net constituting the internal water permeable layer, and the water permeable sheet material and exterior net material that form the enveloping layer are transported while , the work steps of stacking these materials, wrapping the exterior net material and water-permeable sheet material, joining the edges on both sides, sewing with a sewing machine, and cutting are mechanically performed sequentially and continuously in accordance with the feeding of the material. Ru.

[Example] Next, embodiments of the present invention will be described based on the drawings.

FIGS. 1 and 2 show a mat-like drainage filter medium (A) according to the present invention, and (1) is an internal water-permeable layer in which linear filaments of thermoplastic resin are arranged vertically, horizontally or diagonally. A large number of nets (2) made of synthetic wood III, such as nets (2) having a relatively coarse three-dimensional structure, are made by crossing a large number of nets at required intervals and fusing and integrating them at the intersections, and then It has drainage properties. In the case of the figure, a water-permeable layer (1) consisting of an 8WJ net layer is constructed by stacking four flat cylindrical nets (2). Transparent! For (1), a wide net similar to the above can be folded or wound into multiple layers to form the desired thickness and width, or a large number of synthetic resin filaments may be entwined to form the desired thickness and width. However, it is possible to implement it in various forms, such as one having great drainage properties in the longitudinal direction.

(3) is a water-permeable sheet for a filter, and is made of an interlaced sheet of synthetic fibers or other water-permeable sheets of the same material.

(4) is an exterior net, which is made of a net made of cross-fused synthetic resin filaments similar to the net of the water-permeable layer (1). This exterior net (4) and the water permeable sheet (
3) is a covering layer that is wrapped around the outside of the water-permeable layer (1), and its both end portions are covered with the water-permeable layer (1).
), and the entire covering layer and water-permeable layer (1) are continuous in the longitudinal direction at the meeting part (5) with a strong synthetic thread such as nylon thread. and sutured.

(6) shows the sutured portion.

It should be noted that with respect to the stitching form at the meeting part (5), it is also possible to stitch only the enveloping layer of the exterior net (4) and the water permeable sheet (3), but it is also possible to stitch the entire covering layer of the outer net (4) and the water permeable sheet (3). It is preferable to sew the nets together so that they can be easily sewn together using a sewing machine or the like, and the internal nets (2) can be maintained in an overlapping state. In addition, it can be sewn using a single stitch, a zigzag stitch, or other stitches depending on the purpose.

The width, thickness, length, etc. of the above-mentioned drainage filter medium (^) can be determined as appropriate depending on the place and manner of use, etc., but for example, the width is 200 to 500 mm, the thickness is 20 to 100 mm, and the length is 2 to 5 mm. 8m
It is common that the The thickness is internal water permeability F1 (1)
This can be easily changed by changing the number of net layers, etc.

Further, the mesh size of each net (2) and (4), the thickness of each material, etc. can be determined as appropriate depending on the mode of use.

Alternatively, a non-water permeable synthetic resin sheet (not shown) may be interposed on the lower surface side of the water permeable 1i (1) so that it can function as a water channel.

Next, a method for manufacturing the above-mentioned drainage filter medium (A) will be explained in order along with an apparatus for using it.

First, on the feeding rock structure consisting of the feeding guide roller (10), etc., the filter medium (A) made of synthetic wood IIl and to be manufactured is
A long exterior net material (4°) with a width slightly wider than the circumference of is overlaid with a water-permeable sheet material (3°) made of a synthetic resin fiber entangled sheet, etc., which is approximately the same width and long. Furthermore, a plurality of long synthetic resin net materials (2゛) having a width corresponding to the filter medium (A) to be manufactured are stacked on top of each other as a water-permeable layer material, and fed in the length direction. ).

At this time, each of the plurality of net materials (2") is vertically aligned by a multi-stage dedicated mechanism (11) arranged at the starting end side of the feeding mechanism, as shown in FIGS. 4 and 5. to the feeding mechanism.Each dedicated shelf (11) of the dedicated mechanism (11)
12) has an opening on the minus side so that auxiliary work can be performed from this opening side. (13) is a vertically movable adjustment roller arranged above the feed guide roller (10) at the starting end position of the feed mechanism, and is configured to adjust the net material (2°) fed from the dedicated mechanism (11). Water permeable sheet material (3°)
and the exterior sheet material (4゛).
3) and the feed guide roller (10) to keep them in an overlapping state and feed them.

Then, as described above, the outer net material (4'), the water-permeable sheet material (3°), and the plurality of net materials (2°) are overlapped and fed in the length direction, while the Both end portions of the exterior net material (4°) and the water-permeable sheet material (3') are covered with enveloping guides (14) arranged along the feeding mechanism.
), the plurality of net materials (2°) are gradually bent and wound around the upper surface of the water permeable layer material (1°), and the water permeable layer material (1°) is wound around the exterior net material (4°). ) and a water-permeable sheet material (3゛).

As shown in (b) and (c) in FIG. 3, this winding and enveloping effect is achieved by first wrapping one side of the both end portions in the water-permeable layer material (
1 degree), then turn the other side to the top surface of the water permeable layer material (1 degree), and then turn both end portions to the water permeable layer material (1 degree).
Let's have a meeting upstairs. Therefore, the covering guide (14) is
The both end portions are formed so that the winding and wrapping action from one side can be performed in accordance with the feeding action. The covering guide (14) may be formed by bending a plate such as an iron plate to correspond to the above-mentioned winding and covering action.
It is also possible to arrange rods such as synthetic resin pipes at required intervals in the feeding direction and to bend the rods so as to correspond to the winding and enveloping action in the same way as described above. The external net material (4゛) has little frictional resistance and can be transported smoothly.

In this way, the water permeable sheet material (1°) is covered with the water permeable layer material (1°).
3°) and the outer net material (4°), machine stitching is performed continuously in the length direction at the meeting part (5') according to the running action, and the wrapping layer and The entire internal water-permeable layer material (1°) is made of synthetic yarn (15)
2), thereby the abutment part (5)
°) are held in a bonded state.

As the sewing machine (16) used for the above-mentioned sewing, for example, a sewing machine for making tatami mats or another sewing machine that can sew objects of considerable thickness is used. In addition, as a synthetic yarn (15),
Various synthetic resin monofilament yarns such as nylon yarns and synthetic fiber yarns can be used, and depending on the embodiment and the material of the synthetic resin net, etc., a strong yarn that can sufficiently hold the net etc. is used. The sewing method can be selected from single stitches, zigzag stitches, and other methods depending on the type and purpose of the net. In the figure, (17) shows a sewing machine needle, (18) shows a presser member for the suture part, and (19) shows a receiver member.

The filter material product (Ao) that has been sewn as described above in Part 1 and is pulled out and conveyed while being held between the product take-up roller (20) such as a rubber roller and the upper presser roller (21), is then sewn up as described above. It is cut to a required length using a cutter (22) depending on the usage conditions such as the construction site. In particular, this cutting device is equipped with a sensor (23) such as a limit switch at the front in the drawer feeding direction.
When the cutter (22) detects the tip of the filter media product (＾゛), the cutter (22) performs a cutting action while moving in the feeding direction in synchronization with the feeding speed of the filter media product (Ao) while clamping the product. When completed, it is arranged to return to its original position. Therefore, the cutter (22) of the sensor (23)
) By changing the distance from the cutting start position, a filter medium (A) of any length can be obtained. By the way, the synthetic thread at the sutured portion is also cut, so if necessary, the cut thread ends are treated to prevent fraying.

When manufactured in this way, a long synthetic resin net material (2゛), etc. that constitutes the internal water-permeable layer, a water-permeable sheet material (3゛), which becomes the enveloping layer, and an exterior net material (4゛), etc. ), stacking these materials, covering the exterior net material (4゛) and water-permeable sheet material (3°), joining the edges on both sides, sewing with sewing machine, and cutting. The work process can be carried out sequentially and efficiently in accordance with the feeding, and the water permeable sheet (3) and the exterior net (4) are wrapped on the outside of the water permeable sheet 111 (1), and in the longitudinal direction at the meeting part. It is possible to easily obtain the drainage filter medium (A) of the present invention in which the filter medium (A) is continuously sewn together, and its production can be automated.

In addition, the wastewater filter material (^) manufactured as described above is
For example, it is used for underground drainage by being buried on the back side of tunnel walls, the back side of retaining walls or block walls, in roadbeds, embankments, and other soil, and underground water is drained from the outside exterior net (4
) and the water-permeable sheet (3) serving as a filter, it flows into the internal water-permeable portion El (1), and is drained in its longitudinal direction. In particular, since the meeting part (5) of the water-permeable sheet (3) serving as a filter and the outer net (4), which is an enveloping layer, is sewn continuously in the longitudinal direction with synthetic thread, the meeting part (5) ) are joined over the entire length, so that during the above-mentioned buried use condition, earth and sand will not enter the inside from the joint, and since the joint is strong over the entire length, it will easily come off or break. The material has excellent water resistance and will not corrode. Therefore, it does not easily lose its shape even in the soil, ensuring good drainage over a long period of time.

[Effects of the Invention] As described above, according to the drainage filter medium of the present invention, the meeting part of the outer net, which is the enveloping layer, is sewn continuously in the longitudinal direction with synthetic thread, so that the airtightness of this meeting part is improved. It has excellent shape retention properties, so dirt and sand will not get inside, and there is no risk of joints coming off, net damage, or corrosion.
Alternatively, when used buried in the ground, it does not easily lose its shape even if external force is applied to it, ensures good drainage over a long period of time, and is extremely durable. Of course, it is lightweight and easy to handle, is flexible, can be easily fitted to complex walls, and is easy to use.

Further, according to the above-described manufacturing method of the present invention, each work process such as overlapping each material, sewing and cutting of the covering and the covering layer meeting portion can be performed continuously as the material is fed, so that the manufacturing can be automated and the manufacturing efficiency can be greatly increased, and a drainage filter medium having the above-mentioned effects can be easily and inexpensively manufactured and provided. Moreover, since it is cut from a long material, it is possible to manufacture a drainage filter medium of any length, and the cut ends are aligned, making it possible to obtain a filter medium with good appearance.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing an embodiment of the drainage filter medium of the present invention, Fig. 2 is an enlarged sectional view taken along line ■-■ from the previous section, and Fig. 3 shows the manufacturing process of the drainage filter medium of the present invention. 4 is a schematic longitudinal sectional view showing the same manufacturing state, and FIG. 5 is the previous V-V
FIG. 3 is a schematic cross-sectional view of the line. (A)...Drainage filter material, (1)...Water permeable layer, (2)
... Synthetic resin net, (3) ... Water-permeable sheet such as fiber entangled sheet, (4) ... Exterior net, (5) ...
...Meeting part, (6)...Sewing part, (1゛)...
・Permeable layer material, (2°)...Long net material, (3°)
...Water permeable sheet material, (4°)...Exterior net material,
(14)...Covering guide, (15)...Synthetic thread, (
16) Sewing machine, (Ao) Long filter media product.

Claims (1)

[Scope of Claims] 1. A water-permeable sheet made of an interlaced fiber sheet or the like is placed on the outside of an internal water-permeable layer formed of a relatively coarse synthetic resin net or the like to provide drainage in the longitudinal direction. A resin exterior net is sequentially wrapped as a covering layer,
A drainage filter material, characterized in that both end portions thereof are pressed together on the surface of the water-permeable layer, and at least the envelope layer is sewn continuously in the longitudinal direction at this meeting portion with synthetic thread. 2. The drainage filter material according to claim 1, which is entirely sewn together at the meeting portion. 3. Add a water-permeable sheet material, such as an intertwined sheet of synthetic fibers, to a long exterior net material made of synthetic resin and slightly wider than the circumference of the filter medium to be manufactured, and having approximately the same width as the long exterior net material. A water-permeable layer material made of a long synthetic resin net with a width corresponding to the filter material to be manufactured is layered on top of the layer material, and is conveyed in the length direction on both sides of the exterior net material and the water-permeable sheet material. Turn the end portions along the wrapping guide to the upper surface side of the water-permeable layer material, cover the water-permeable layer material with an exterior net material and a water-permeable sheet material, and press the both end portions together on the water-permeable layer material. A method for producing a drainage filter medium, further comprising: sewing at least the envelope layer with a synthetic resin yarn continuously in the length direction at the meeting part by sewing with a sewing machine, and then cutting into a predetermined length.