JPH0368964B2 - - Google Patents

Description

Claim 1: The core is free of holes and has an aligned set of protrusions, and the fabric spans the protrusions, thereby forming an interconnected space, which defines a passageway between the fabric and the core so that, in use, water A method of manufacturing a drainage device comprising a strip of core material and permeable textile filter fibers surrounding the core material, which can pass through the fabric and flow through a passageway, comprising: feeding a strip of core material to a forming device; supplying a single fabric to the forming device; bending the textile strip around the core so that one side edge of the textile strip overlaps the core; applying adhesive means to the textile strip adjacent the one side edge; A method characterized in that it comprises the steps of: overlapping the other side edges of the textile strip so as to surround but not adhere to the core; and withdrawing the strip from the forming device.

2. The method according to claim 1, wherein the adhesive means is a hot-melt adhesive, and the overlapping ends are pressed for a sufficient period of time to make them stick.

3 The finished product is cut into lengths for rolling or folding to facilitate packaging;
The method according to claim 1 or 2.

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a drainage device comprising a strip of core material and a permeable textile filter fabric surrounding the core material, wherein the core material is free of holes and includes an array of protrusions, the fabric extending over the protrusions thereby It forms an interconnected space that constitutes a passageway between the fabric and the core material, so that when in use,
The present invention relates to a method for manufacturing a drainage device characterized in that water can pass through a fabric and flow through a passage.

Drainage devices are intended for use in draining surface sewage or other sites where it is necessary to drain wet ground.

The object of the invention is to provide an improved method for manufacturing a drainage device as described in the opening.

The method according to the invention comprises feeding a strip of core material to a forming device, feeding a single fabric strip to the forming device, and bending the fabric strip around the core material so that one side edge of the fabric strip overlaps one side of the core material. , applying adhesive means to the fabric strip adjacent to said one side edge, and overlapping the other side edge of the fabric strip so that the fabric strip surrounds but does not adhere to the core; and strip-like material from the forming device. It is characterized by consisting of a recovery stage.

Preferably, the adhesive means is a hot melt adhesive and the method includes pressing the overlapping edges together for a sufficient period of time to make them stick.

After production by the above method, the finished plastic product is cut to the desired length for easy rolling or folding for packaging.

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

In the figures, FIG. 1 is a cross-sectional view of the core material used in the drainage device according to the manufacturing method of the present invention, FIG. 2 is a plan view of the core material shown in FIG. 2 shows a product manufactured by the method of the invention in the shape

4 is a cross-sectional view of the drainage strip shown in FIG. 3; FIG. 5 shows an example of a technique for manufacturing the drainage strip shown in FIGS. 3 and 4; FIG. Figures 7 and 8 show an example of forming a seam in a drainage strip, and Figure 9 shows another example of the drainage strip of the present invention. 10 shows a typical application example of the drainage strip shown in FIG. 9, and FIG. 11 shows an example of driving the strip into a clod of soil.

The core structure shown in FIG.
Preferably, it consists of a layer of bicuspid material, such as that disclosed in US Pat. The core material 2 is (1- in Fig. 2)
As shown in the sectional view of FIG. 1 (which is a sectional view taken along line 1), a regular array of protrusions 4, 6 are formed, each projecting from opposite sides of the layer.

The outer tips of the protrusions 4, 6 are flat and located in planes 8, 10, respectively. Protrusion 4,
Although the exact appearance of 6 is not critical, it is desirable to have a flat outer surface as shown.

Figures 3 and 4 illustrate an embodiment of the invention for producing a drainage strip 35, which is suitable for draining water from wetlands, hillsides or highway shoulders. Heartwood 2 has a thickness,
That is, the distance between planes 8 and 10 is usually 4 cm, for example.
Preferably, the structure is the same as that shown in FIGS. 1 and 2, except that. strip 35
has standard widths of, for example, 20 cm, 30 cm, 60 cm, and 90 cm, and can be made into a roll shape with a length of, for example, 50 cm.

In this installation, a web or fabric 12 is wrapped around a piece of corewood to enclose the core. Woven fabric 12 comprises a flexible sheet of water-permeable material, such as a textile filter. One form of filter fiber is polyester nonwoven filter material, which is sometimes used for soil stabilization; one suitable textile is that manufactured by ICI, known as TERRAM.

The width of the fabric 12 is somewhat greater in cross-section than the circumference of the core, so that the end regions of the fabric 12 form lapped flaps 36 that adhere to areas of the underlying fabric layer 12 by lines 38 of hot melt adhesive. ing. One convenient facility for manufacturing drainage strips is shown in FIG. In this installation, core material 2 is fed from rolls 40 to an enveloping step 42 . The fabric 12 is fed from rolls 44 to a wrapping step 42 where it is wrapped around the core strip. Within the wrapping step 42, the adhesive line 38 is applied to the fabric just before the flap 36 is pressed into abutment with the underlying fabric. In this device, the core material 2 is neatly enclosed within the fabric, so that
It is not necessary to bond the core 2 to the fabric 12.

FIG. 6 shows a typical application of the drainage strip 35 shown in FIGS. 3 and 4. In this device, a drainage strip 35 is used to drain land prone to waterlogging.
In the first stage, a groove 4 with a width of, for example, 10 cm and an appropriate depth is made.
6 is dug. Drainage strips 35 are then inserted and trenches 46 are backfilled with soil 48 to complete the underground drainage system. In the best application, the trench depth is maintained constant and drained water is allowed to flow through the drain strip, simplifying trench digging.

FIG. 7 shows a simple technique for forming a joint between the ends of two adjacent drainage strips. First, the fabric layer is stripped off at the end of the drainage strip, exposing e.g. 3-4 rows of protrusions.
These rows of protrusions are joined together as shown in FIG. The ends 50 of the fabric layers of one drainage strip are then placed to overlap the fabric layers of the other strip. The bonding is completed by a band 52 made of adhesive tape.

FIG. 8 illustrates a T-seam technique that can be conveniently made by a seam technique similar to that shown in FIG. Briefly, a portion of the fabric layer 12 of the strip to be connected is partially peeled away to expose the core. Bend the ends to the sides and seam them with the exposed core of the continuous strip. Adjacent fabric layers are folded over each other as shown. Adhesive tape bands 52 are then applied around the exposed edges of the fabric layer.

Embedded strip ends can be covered by removing a portion (eg, 7.5 cm) of the core at the strip end and folding the free portion of the fabric layer around the exposed end of the core. The folded layers can be held in place by adhesive tape.

FIG. 9 shows another embodiment of the drainage device in the form of a thin strip 53. In this device, the core material 2 is made of, for example, a 0.5 mm thick plastic sheet material. The protrusions 4 and 6 are arranged such that the overall core thickness is 3 to 5 mm and the spacing between the protrusions 4 (with respect to the spacing between the protrusions 6) is, for example, 25 mm. The width of the strip is 7.5~
It is in the range of 12.5 cm and is supplied in rolls with a total length of, for example, 120 m.

The drainage strip 53 is particularly suitable for deep dewatering of structures or swamps into which dry fill is to be deposited.

Figure 10 shows a typical application of this strip. As shown, the strips are arranged in a vertical and generally uniform arrangement in the soil 54 being drained. In a typical application, strip 53
are placed at 1.2m center spacing. strip 53
usually extends to a suitable depth, for example in the range of 5 to 30 m. Thereafter, a permeable layer 56 of, for example, sand is formed near the ground, and the ends of the strips 53 are connected to the permeable layer 56.
Stretch it to. A layer of backfill or soil 58 is then placed over the infiltration layer 56 to increase ground pressure in the soil mass 54 to be drained. In these arrangements, water permeates the strip 53, flows upwardly to the permeable bed 56, and is free to drain laterally. In this way, the clod 54 is effectively drained.

FIG. 11 shows an example of how the strips 53 are arranged. In this arrangement, the strip 53 is mounted within a hollow driving member 60, which is positioned to be driven into the soil mass 54 by a pile driver (not shown). A head piece 62 of the appearance shown can be attached to the lower end of the hollow driving member 60 to prevent soil from entering the interior. After the hollow driving member 60 is driven into the soil mass 54 to a desired depth, the hollow driving member 60 is pulled out. The headpiece 62 and strip 53 are held in the soil mass 54 by the lateral pressure of the soil.