JP2581560Y2 - Drain material - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain material used in a drain method for enhancing the consolidation of the ground by efficiently discharging water in the soft ground to the ground surface in a short time.

[0002]

2. Description of the Related Art A drain construction method, which is one of the soft ground improvement methods, is to drive a belt-shaped drain material wound into a roll into the ground by using a special driving machine, and to form the drain material. This drainage method is a method that removes the water contained in the ground early by stabilizing the ground by its water permeability, and this drain method is widely used as an economical consolidation promotion method in ground improvement work on land. . The drain material used in this drain method is, for example, as shown in FIG. 2, a two-sided nonwoven fabric (water-permeable material) 1, 1 ′ is bent into a double-sided groove shape between two nonwoven fabrics (water-permeable material) 1, and is made of polyethylene or the like. Which is provided with a synthetic resin base material 2 interposed therebetween,
Water in the ground that has passed through the nonwoven fabrics 1 and 1 ′ having water permeability is discharged to the ground surface through a water passage 3 surrounded by the nonwoven fabrics 1 and 1 ′ and the base material 2. Further, the shape of the water passage may be a wave shape as shown in FIG. In this case, the cross-sectional area per one water channel is larger than that of the double-sided groove shape, but the cross-sectional modulus increases due to the use of the material, and the possibility of bending due to the curvature of the drain caused by the subsidence of the ground increases. . In order to avoid this, a water channel having a double-sided groove shape is often used. However, a double-sided groove-shaped water channel has a smaller cross-sectional area per water channel than a corrugated one. Therefore, it is inevitable that the drainage efficiency decreases as the water flow distance increases.

The drain material is driven in a direction perpendicular to the ground surface, but when the ground sinks with the progress of drainage, the drain material is deformed, and as shown in FIG. The ground surface (G) is greatly curved and slightly curved depending on the location, and the distance between the adjacent drain members 4 is different in the depth direction (arrow D). Since the time required for consolidation of the ground is governed by the maximum value of the interval between the drain materials 4, much time is required for consolidating the portion where the drain material 4 is irregularly deformed.

Further, as a countermeasure against drainage when a water passage cross-section is reduced due to crushing or clogging of a certain water passage, as shown in FIG. A large number of through holes 6 are formed and the substrate 5
A rib plate 7 formed substantially parallel to the longitudinal direction on both sides thereof is formed with a cut 8 penetrating the rib plate 7 in the lateral direction, and the water passages in the drain communicate with each other (see Japanese Utility Model Laid-Open No. 2-6738). Further, as shown in FIG. 6 (a), "a groove member 9 is interposed between the two nonwoven fabrics 1 and 1 ', and in the longitudinal direction of the groove member 9 as shown in FIG. 6 (b). A plurality of cuts 10 are formed at predetermined intervals so that adjacent water passages can communicate with each other (see Japanese Patent Publication No. 3-57245). 5 and 6, since the adjacent water passages communicate with each other, even if a certain water passage is closed, the water moves to the adjacent water passage, so that the draining operation is not interrupted at all. However, in the one shown in FIG. 5, drainage takes time because the cross-sectional area of each water passage is small and the resistance is large. Moreover, since the thing shown in FIG. 6 merely made a cut, the movement of the water between adjacent water passages cannot be performed smoothly. In addition, the methods shown in FIGS. 5 and 6 cannot suppress the irregular curvature of the drain material.

The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to reduce the drainage resistance even if it is long and to bend into an irregular shape in the soil. It is an object of the present invention to provide a drain material that allows smooth movement of water between water passages, discharges water in soft ground to the ground surface in a short time, and quickly strengthens the consolidation of the ground. .

[0006]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the invention has been made to solve the problem described above.
Material, and a flat plate interposed between these two permeable materials
Numerous rib plates approximately parallel to the longitudinal direction are integrated on both sides of the substrate
Formed by each rib plate, water permeable material and substrate
In drain materials with many water passages, one of the
From the rib plate in contact with the water material to the other water-permeable material through the flat substrate
These are cut out over the rib plate in contact with
Forming the same water passage adjacent to the substrate.
And the adjacent water passages across the rib plate
A drain material characterized by communicating with each other.
1). In this invention, the narrow groove-shaped opening is substantially aligned in the length direction.
Open zone provided at regular intervals and provided with this narrow groove-shaped opening
And the non-open zone that is not provided alternately in the longitudinal direction
It may be arranged (claim 2). In addition, these ideas
Between the longitudinal direction of the narrow groove-shaped opening and the width direction of the drain material.
The angle formed may be 30 ° or more and 60 ° or less.
3).

[0007]

According to this drain material, it comes into contact with one of the permeable materials.
From the rib plate that comes in contact with the other permeable material through the flat substrate
These are cut out over the plate to form a narrow groove-like opening.
Since the width direction of the drain member, the permeability in the thickness direction and length direction ing large. Accordingly, flow resistance is reduced, there is no possibility that the drainage efficiency drops in the drain member long.

In addition, the water passages adjacent to each other across the substrate are
The water passages that are connected to each other and that
As it is passed through , 1
It is lowered One water passage of drainage capacity, water moves to another water passage adjacent to and fro through the Hosomizojo opening. Follow
Te, the water in the ground is discharged smoothly to the ground surface, the consolidation of the ground even when ground improvement depth is deep, to proceed smoothly. Also, by arranging the narrow groove-shaped openings at substantially constant intervals in the longitudinal direction, the rigidity of the drain material is forcibly changed in strength, so that the drain material in the ground is shown in FIG. As described above, the drain material is deformed regularly at a substantially constant pitch, and the drain materials do not bend irregularly. Ma
In addition, the distance between the longitudinal direction of the narrow groove opening and the width direction of the drain
If the angle between 30 ° and 60 ° is set, the drain material
It is necessary to secure the number of waterways that can communicate while maintaining strength.
it can.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1 (a), two long non-woven chemical fiber nonwoven fabrics (water-permeable material) having a width (in the WW direction of the drawing) of about 100 mm
1, 1 'are spaced apart by about 3 mm, and between these two nonwoven fabrics, a polyethylene plate-like substrate 5 integrally formed with a large number of rib plates 7 substantially parallel to the longitudinal direction on both surfaces thereof is provided. Intervening
By doing so , each rib plate 7, nonwoven fabric 1, 1 ′ and substrate 5
Numerous water passage 11 is formed in two rows across the substrate surrounded by the. Then, by cutting them obliquely across the rib plate 7 from the rib plate 7 in contact with the nonwoven fabric 1 through the flat substrate 5 in contact with the nonwoven fabric 1 ', narrow groove-like apertures 12
Are formed. Such a narrow groove-shaped opening 12 is shown in FIG.
As shown in (b), the left and right sides of the drain material intersect at regular intervals in the longitudinal direction (arrow L) from the center in the width direction to the end.
A plurality is formed mutually , and further, as shown in FIG.
Arranged at regular pitches Hosomizojo and opening the opening formed zones (hatched portion) and Hosomizojo <br/> opening without the non-open zone (white recessed portions) are alternately the drain member longitudinally (arrow L) Have been.
Therefore, even if the earth pressure is applied to the nonwoven fabrics 1 and 1 ', the open zones and the non-open zones arranged at a constant pitch allow
Since the rigidity of the drain material changes regularly at a constant pitch , as shown in FIG. 4 (b), the drain material 4 has a substantially constant shape, curves in the depth direction (arrow D), and is adjacent to the drain material. Drain material 4
Unevenness does not occur in the interval between.

The longitudinal direction of the narrow groove-like opening and the width of the drain material
The angle θ (see FIG. 1B) with the direction (W) is 30 ° or less.
The upper angle is preferably 60 ° or less. As the angle θ approaches zero,
That is, the tensile strength decreases as the direction becomes parallel to the width direction (W) of the drain material, and buckling becomes more likely. On the other hand, when the angle θ is 9
As the distance approaches 0 °, the number of water passages communicating with each other by the narrow groove-shaped openings decreases.

[0011]

[Effect of the Invention] The drain material according to the present invention has the following effects because it is configured as described above.

[0012] From the rib plate in contact with one of the permeable materials,
Over the rib plate that comes into contact with the other
Since the grooves are cut out to form the narrow groove-shaped openings , the communication between the water passages is improved, the water permeability is increased, and the water flows easily. This narrow groove-shaped opening is connected to the water passage adjacent to the substrate.
And the adjacent water passages across the rib plate
By providing in communication, even if reduced drainage capacity of a single water channel like crushing or clogging due earth pressure, fine
Through the groove-shaped opening moves water to another water passage adjacent, since the water in the ground without any problem even deeper soil improvement depth can be discharged to the ground surface, compaction reinforcement of the ground is smoothly line Will be Furthermore, if the narrow groove-shaped openings are formed at a constant pitch in the longitudinal direction of the drain material, a predetermined driving strength can be maintained and the drain material can be curved almost regularly, so that the intervals between the drain materials are uneven. And there is no delay in consolidation. And since the size is almost the same as that of the conventional one, the handleability at the time of roll-shaped winding does not decrease.

[Brief description of the drawings]

FIG. 1 (a) is a partially cutaway perspective view of a drain material of the present invention, FIG. 1 (b) is a diagram illustrating a planar arrangement of narrow groove-shaped openings in the drain material, and FIG. 1 (c). FIG. 3 is a view for explaining the arrangement of an open zone and a non-open zone in the longitudinal direction of the drain material.

FIG. 2 is a perspective view of the cut away part of the drain material of the traditional.

FIG. 3 is a cross-sectional view of another conventional drain material.

FIG. 4 (a) is a diagram illustrating a state of deformation of a conventional drain material in the ground, and FIG. 4 (b) is a diagram illustrating a state of deformation of the drain material of the present invention in the ground. .

FIG. 5 is a partially cutaway perspective view of a conventional drain material having a through hole and a cut.

6 (a) is a sectional view of a conventional drain material having a cut, and FIG. 6 (b) is a sectional view taken along line VI-VI of FIG. 6 (a).

[Explanation of symbols]

1, 1 '... nonwoven fabric 2, 2' ... base material 3 ... water passage 4 ... drain material 5 ... substrate 6 ... through hole 7 ... rib plate 8 ... cut 9 ... groove material 10 ... cut 11 ... water passage 12 ... narrow groove Jo opening

Claims (3)

(57) [Scope of request for utility model registration] 1. Two permeable materials which are separated from each other and opposed to each other
Provided and, integrally forming a substantially parallel plurality of rib plates in the longitudinal direction on both sides of the flat substrate is interposed between the two sheets of water permeable material, surrounded by and the substrate each rib plates and permeable material In the drain material having a large number of formed water passages, a narrow groove-shaped opening is formed by cutting out from a rib plate in contact with one of the water permeable materials to a rib plate in contact with the other water permeable material through the plate-shaped substrate.
By this, the water passages adjacent to each other with the substrate
Communicates and communicates with adjacent water passages across the rib plate
Drain material characterized by doing. 2. The method according to claim 1, wherein the narrow groove-shaped openings are arranged at substantially constant intervals in the length direction.
The opening zoning provided with this narrow groove-shaped opening
In the longitudinal direction
The drain material according to claim 1, wherein the drain materials are arranged mutually. 3. A longitudinal direction of said narrow groove-shaped opening and a drain material.
The angle between the width direction and the width direction is 30 ° or more and 60 ° or less.
The drain material according to claim 1.