JPH0745621Y2 - Drain material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a drain material that absorbs water contained in the ground by placing it on soft ground having a high water content ratio.

<Prior Art> Conventionally, the drain material 40 shown in FIGS. 4a and 4b is used as one of the methods for sucking up pore water in soft ground having a high water content ratio. The drain member 40 is made of synthetic fiber, synthetic resin, or the like, and has a core 41 having a quadrangular tubular shape through which water passes, and is formed into a plate shape having a width of 10 cm and a thickness of 3 to 5 mm. ing. The construction method is to improve the ground by driving the drain material, draining pore water contained in the ground through the drain material, and promoting consolidation in the ground.

<Problems to be solved by the invention> However, when a conventional drain material formed into a plate shape is used, if the layer for ground improvement is thick, that is, the casting length of the drain material is long, the core of the drain material is long. There is a drawback in that the resistance of water flowing through the body gap increases (well resistance), the drainage action decreases, and the consolidation promoting effect in the ground decreases. Further, in order to compensate for this drawback, the pitch of the drain material is made dense and the number of piles is increased, but there is a problem that work efficiency is lowered.

The present invention has been made to solve the above inconvenience,
It is an object of the present invention to provide a drain material that can prevent the drainage function that absorbs water contained in the ground from being deteriorated when the drain material is driven deep into the ground.

<Means for Solving the Problems> The present invention has been made in view of the above objects, and the gist thereof is a drain material that absorbs pore water of soft ground having a high water content, and has a cross section of a water absorbent resin. Is a drain material comprising a flat H-shaped and long plate-shaped water-absorbing expansive material and a clogging preventing film integrally formed on the surface of the water-absorbing expansive material.

Here, the clogging prevention film that protects the outer side of the water-absorptive expansion material is formed of a non-woven fabric or the like. Also, as the water-absorption expansion material, the trade name "Aquakeep" (registered trademark) (manufactured by Iron and Steel Chemical Industry) and the trade name "Sunwet" (registered trademark)
A water absorbent resin such as (manufactured by Sanyo Kasei Co., Ltd.) is preferable, and a part or the whole of the resin can be compression-molded and expanded when it contains water so that the entire inside of the tube can be expanded.

<Operation> When a drain material in which a water-absorbing expansive material is placed in the pipe is placed on a soft ground having a high water content ratio, the water-absorbing expansive material absorbs moisture of the ground and expands to the entire inside of the pipe, Since it functions as a drain material having a large diameter, the well resistance can be reduced. The absorbed water is sucked up to the ground by the capillarity of the water-absorbing expansive material, thus promoting the consolidation in the ground.

<Example> An example of the drain material according to the present invention will be described with reference to the accompanying drawings.

FIG. 1a is a schematic cross-sectional view showing a state in which a drain member 3 according to the present invention is arranged in a mandrel 2 as a tubular body.
The drain material 3 of the present invention comprises a water-absorption material 3b and a clogging prevention film 3a integrally formed on the surface of the water-absorption material.

The mandrel 2 is a drain material 3 on soft ground with a high water content.
Is a tubular body for placing a steel, and is formed of steel into a cylindrical shape, the bottom of which is an inner flange 4 for preventing intrusion of soil when the steel is cast on the soft ground, and the inner flange of the inner flange. It has a substantially rectangular opening 5 in the center.

As shown in FIG. 2, the water-absorptive expansive material 3b is compression-molded into a long plate shape having an H-shaped cross section, and the periphery thereof is covered with a clogging prevention film 3a using a non-woven fabric or the like. . Further, the drain member 3 is locked in the mandrel 2 by a locking rod 6 provided at the bottom, with a part thereof exposed from the opening 5 (see FIG. 1a). Since the drain material 3 is formed in a long plate shape, it can be easily wound into a roll shape, and the drain material 3 can be transported and stored in the roll shape and can be stored in the mandrel 2. When mounting it, cut it to the required length and use it.

When the mandrel 2 provided with the drain material 3 having the above-described configuration is driven into the soft ground having a high water content at a predetermined length and at a certain interval, the drain material 3 absorbs moisture entering from the bottom opening 5 of the mandrel 2. It absorbs and expands throughout the mandrel 2 (Figs. 3a, 3b). Therefore, it functions as a moisture absorbing material having an inner diameter equal to that of the mandrel 2, and the absorbed moisture is
It is sucked up on the ground through the water absorbing expansive material 3b by the capillary phenomenon.

In the drain material according to the present invention, the shape of the mandrel as the tubular body is not limited to the shape shown in FIG. 1a, and for example, the mandrel is gradually reduced in diameter toward the tip end so that it can be easily placed. It can also be shaped like a wedge (see Figure 1b). At this time, the water-absorbing expansive material, as shown in FIG. 1b,
It may be bent and locked via the packing 7 outside the tip of the mandrel. Further, the mandrel may be provided with a plurality of openings around the mandrel in order to enhance the permeability of water to the inside.

Furthermore, the shape of the water-absorbent expansive material is not limited to the shape shown in the figure, it does not hinder the insertion into the mandrel, and also expands inside the mandrel when absorbing water. Any shape can be used.

<Effect> Since the drain material according to the present invention is provided with a water absorbing expansive material that expands when absorbing water and a clogging prevention film integrally formed on the surface thereof, the drain material can be applied to soft ground having a high water content ratio. When placed, the water-absorbing expansive material absorbs moisture in the ground and expands inside the clogging prevention film, so that it functions as a drain material having a larger diameter than the conventional drain material. Therefore, it is possible to reduce the well resistance, and it is possible to prevent the deterioration of the drainage action that occurs when the conventional drain material is driven deep into the ground. Further, there is an effect such that the driving interval of the drain material is widened to reduce the number of driving and the working efficiency is improved.

Further, since the water absorbing expansive material of the drain material of the present invention adopts a configuration in which the cross section is flat H-shaped and is formed into a long plate shape, it is wound up as it is and transported to the construction site. Even if the installation depth changes, it can be cut at the construction site according to the installation depth and the construction can be performed without providing the joint portion over the entire length of the drain material. Therefore, for example, even if subsidence or a horizontal fault occurs in the ground provided with the drain material of the present invention, even if an external force acts, the water absorbing expansive material is disconnected at the joint portion and the drainage action due to the capillary water absorbing phenomenon is hindered. There is no.

Further, since the drain material of the present invention is provided with the clogging prevention film integrally formed on the surface of the water-absorbing expansive material, the tensile strength of the water-absorbing expansive material can be reinforced and the above-mentioned external force acts. Also in this case, it is possible to prevent the water-absorbing expansive material from being easily cut.

Furthermore, the water absorbing expansive material of the drain material of the present invention adopts a configuration in which the cross section is formed into a flat H shape,
It has become possible to wind and fold it back.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1a is a cross-sectional view showing a drain material according to the present invention, FIG. 1b is a cross-sectional view showing another embodiment, FIG. 2 is a schematic perspective view showing a water-absorption expandable material, and 3a. Figure is a radial enlarged cross-sectional view of the drain material before absorbing moisture, Figure 3b is a radial enlarged cross-sectional view of the drain material after absorbing moisture, Figure 4a is a schematic perspective view showing a conventional drain material, FIG. 4b is a sectional view taken along line IVb-IVb in FIG. 4a. 1 ... Drain material, 2 ... Mandrel (tube), 3 ...
Water absorbing expansion material.

Claims (1)

[Scope of utility model registration request] 1. A drain material for absorbing pore water of soft ground having a high water content ratio, which is made of a water absorbent resin and has a flat H-shaped cross section and a long plate shape. A drain material composed of a clogging prevention film integrally formed on the surface of the water-absorbing expansive material.