JPS5841372B2 - Water-absorbing fiber bundle for civil engineering work - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fiber bundle that is effective for use in civil engineering work, particularly water drainage work, runoff prevention, and improvement of soft ground.

Recently, mats or sheets have been used in civil engineering work to improve soft ground.

In other words, high-quality soil is poured onto a fiber sheet spread over the soft ground, and the sheet is interposed between the surface of the soft ground and the exposed soil, thereby achieving intensive embankment on the soft ground. The load is transformed into an evenly distributed load using the tensile force of the sheet, or the large frictional resistance generated at the interface between the sheet and the original ground prevents the destruction, flow, and uplift of the soft ground, and prevents the expansion and subsidence of the embankment. Something was done to prevent it.

However, although the use of sheets may be effective in supporting the embankment, it has not been possible to simultaneously support the embankment and drain water.

Alternatively, in an embankment, when a river that has swollen water decreases, the water that impregnated the embankment during the rising water may flow into the river together with the earth and sand of the embankment, weakening the embankment.

Therefore, a mat-like corrosion-resistant material is buried under the surface layer of the embankment.

However, this is also not sufficient in terms of water intake.

Furthermore, it has not been possible to drain water from soft ground using the above-mentioned sheet or the like.

The fiber bundle of the present invention can be driven into soft ground or buried to drain water, and can also be used in place of conventional sheet-like or mat-like materials, and is more compact than conventional sheet-like materials. It has excellent strength, durability, and water intake.

The fiber bundle of the present invention is made as follows.

A filament 3 is made by composite spinning a low melting point component 1 and a high melting point component 2.

The filament 3 may be a side-by-side type in which a low melting point component and a high melting point component are combined in a bimetallic manner, or a sheathed core type in which the low melting point component has a sheath structure and the high melting point component has a core structure.

Examples of the low melting point component 1 and the high melting point component 2 include low pressure polyethylene and crystalline polypropylene, polyethylene isophthalate/terephthalate copolymer and polyethylene phthalate, nylon 6/66/6-10 copolymer and nylon 6, Examples include polyethylene terephthalate/polyethylene adipate copolymer and polyethylene terephthalate.

These spun filaments 3 are bundled at each spinneret to form a tow 4, and are crimped if necessary.

Thereafter, an appropriate number of tows 4 are collected to form an aggregate 5, which is sent to a collection device 9 by a feed roller 8 consisting of a pair of rollers 6.7.

During this time, the aggregate 5 is carefully combed using a combing device 10 consisting of a rotary cylinder with serrations or needles on its circumferential surface so that there is no unevenness within the aggregate. The filaments of each adjacent tow are intermixed so that no splitting occurs in each tow.

The aggregate 5 that has passed through the combing device is focused into a cylindrical shape by a trumpet 11 of a focusing device 9 to form a fiber bundle 12.

The base of the trumpet 11 is surrounded by a heater 13.

The temperature of the heater 13 is such that the low melting point component 1 of the filament 3 can be melted, but the high melting point component cannot be melted.

Then, while the aggregate passes through the focusing device 9, the low melting point component 1 of the filament 3 located on the outer periphery of the aggregate 5
is melted.

Therefore, some of the melted low melting point components 1, 1 of the adjacent filaments 3, 3 are welded to each other, and as shown in FIG. An annular layer in which the filaments have minute gaps between them is formed into a sheath around the outer periphery of the fiber bundle 12, forming a sheath structure 14.

The inside of the sheath structure 14 becomes a core structure 15 made up of filaments 3, 3 which are not welded to each other.

Next, the low melting point component 1 of the fiber bundle 12 is solidified by a box-shaped cooling device 16 filled with a cooled fluid.

Therefore, in the fiber bundle 12, although the adjacent filaments 3, 3 are welded to each other, the welding does not occur over the entire surface of the fiber bundle, and the outer circumferential surface has gaps between the filaments, and the fiber bundle is shaped like a rod. Although it retains its shape, the sheath structure part 1 on the outer peripheral surface
4 toward the inner core structure 15.

Next, the fiber bundle 12 is cut into an appropriate length by a cutter 17.

The fiber bundle of the present invention is produced as described above, and the manner in which it is used will be explained next.

When the fiber bundle of the present invention is used with appropriate intervals of one tree,
Alternatively, as shown in FIG. 6, when the fiber bundles 12 are aligned and adjacent fiber bundles are integrated at appropriate intervals by appropriate means such as gluing or welding, and used as the net-like body 18, furthermore, as shown in FIG.
As shown in the figure, several pieces are lined up in parallel as appropriate,
The mat-like body 1
When used as 9, etc., it is used in an appropriate form.

When using the fiber bundle 12 of the present invention for draining water from soft ground,
As shown in FIG. 9, the fiber bundle 1 of the present invention is placed in soft ground 20.
Type 2 into one tree at appropriate intervals.

The length of the fiber bundle is appropriately determined depending on the depth of the ground 20.

The fiber bundles 1 and 2 driven into the soft ground are connected to the sheath structure 14
Moisture in the soft ground 20 is allowed to penetrate into the sheath structure 15 through minute gaps between unwelded filaments existing on the outer peripheral surface of the core structure 15, and the moisture continues to penetrate into the filament gaps in the core structure 15. Moisture existing in the filament gaps rises within the core structure 15 due to capillary action in the interior 15 and is dissipated from the upper end of the fiber bundle 12 to the outside of the ground.

When the fiber bundle 12 of the present invention is used for embankments, etc., the 10th
As shown in the figure, the fiber bundle 12 is buried vertically at a constant depth below the surface layer of the embankment 21.

A plurality of fiber bundles 12 may be buried in parallel with each other at appropriate intervals or in close proximity to each other.
, it may be buried as a mat-like body 19.

By burying the fiber bundle 12 under the surface layer of the embankment 21 in this way, the water contained in the embankment 21 when the water level decreases will penetrate into the sheath structure 14 of the fiber bundle 12, as in the above usage example, and the core structure It can be released outside embankment 21 through section 15,
Furthermore, the fiber bundles can suppress the outflow of earth and sand that occurs due to the movement of water due to repeated increases and decreases in water.

As another example of the use of the fiber bundle of the present invention, it may be used in place of a sheet when embanking soft ground 20.

When the fiber bundle 12 of the present invention is used instead of a sheet, a large number of fiber bundles are aligned in the same direction and brought close together, or the mat-like body 1
9, the mat-like body 19 is laid on soft ground 20 as shown in FIG. 11, and soil 22 is poured onto it.

In this way, due to the friction between the fiber bundles 12 or the mat-like body 19 and the surface of the soft ground 20, the soil 22 will not sink into the soft ground 20, and furthermore, the soil 22 will not sink into the soft ground 20.
The moisture in the fiber bundle 12 of the mat 19 is sucked into the fiber bundle 12 of the mat 19 in the same manner as in the above usage example, and is finally radiated to the ground surface from both ends of the mat.

When the fiber bundle of the present invention is driven into soft ground as described above, it absorbs moisture in the soft ground by capillary action and effectively dissipates it, so it is effective when used as a means of draining water from soft ground, and can also be used as a method for embankment. By burying it under the surface, it can drain water and at the same time have the effect of preventing surface washing.

Furthermore, if the surface of the soft ground is covered with a mat-like continuous fiber bundle of the present invention and soil is poured onto the top surface, the soft ground can be stabilized while draining water.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views of filaments constituting the fiber bundle of the present invention, FIG. 3 is a schematic side view of an apparatus for producing the fiber bundle of the present invention, FIG. 4 is a plan view of the same, and FIG. cross-section of the bundle,
Figure 6 is a plan view of fiber bundles joined in a mesh pattern, Figure 7
The figure is a plan view of flat plates joined into a mat shape, Figure 8 is a cross-sectional view taken along line ■-■ in Figure 5, Figure 9 is a cross-sectional view of fiber bundles driven into soft ground, and Figure 10. 11 is a cross-sectional view of the fiber bundle used in an embankment, and FIG. 11 is a cross-sectional view of the fiber bundle used when discharging soil into soft ground. DESCRIPTION OF SYMBOLS 1...Low melting point component, 2...High melting point component, 3...Filament, 5...Aggregation, 12...Fiber bundle , 14... Sheath structure part, 15... Core structure part.

Claims (1)

[Claims] 1. On the outer peripheral surface of an aggregate formed by bundling filaments obtained by composite spinning of a low melting point component and a high melting point component, a portion where the low melting point components of the filament are welded together, and a filament in an unwelded state 1. A water-absorbing fiber bundle for civil engineering work, characterized in that a sheath structure part is formed into an annular shape, including parts with gaps between them.