JPS58123922A - Constructing method for water permeable foundation for banking and water permeable body used in said method - Google Patents

Abstract

PURPOSE:To improve pressure resistance strength and permeability of a banking, by a method wherein a water permeable sheet, a permeable-to-water disc-form bodies having a number of solid structures having permeability, a water permeable sheet, a water permeable auxiliary plate, a permeable-water permeable sheet, a water permeable auxiliary plate, a water permeable sheet, and a banking are placed are laid sequentially in said order. CONSTITUTION:A number of semi-tubular bodies 1 consisting of an expansion metal having rigidity are aligned in series and in parallel at slight intervals on a strong plastic net foundation 2 to form a disc-form body A secured to the foundation 2 by means of metal rings 3. When installing, a permeable-to-water sheetform object 4 such as woven cloths or unwoven cloths is placed on a ground B, water permeable disc-form bodies A are aligned thereon, a water permeable reinforcing plate 5 such as plastic covers thereover, a water permeable space C is formed, and after the permeable-to-water sheetform object 4 covers thereover, a banking D is conducted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a method for forming a permeable foundation for an embankment used when embanking is placed on soft ground to improve the ground by consolidation settlement, and a permeable base used for the method. After laying a large sheet with several tens of sheets and a thick layer of highly permeable sand, if necessary, install sand piles, etc., to easily drain underground consolidated water to the surface (shi, embankment). In this case, sand has been used to quickly drain consolidated water and rainfall, as well as to ensure the ease of transport of working machines onto soft ground.

However, in recent years, high-quality sand has become extremely difficult to obtain and expensive. On the other hand, in the case of large-scale land development,
There is a lot of land with poor ground, such as swamps and fields, and the demand for sand is increasing.

In view of such social conditions, the present invention aims to provide a method for forming a permeable foundation for embankment that does not require sand and has excellent pressure resistance from above, as well as adaptability to the ground and water permeability. It is something.

Embodiments of the invention will be described in detail with reference to the drawings.

[Example 1] As shown in Fig. 1, a large number of semi-cylindrical bodies made of rigid expanded metal are placed in series with a slight interval on a base (2) made of a strong plastic net. After arranging them in parallel with an interval of

During construction, as shown in Figure 2, a water-permeable sheet-like material 4) made of woven or non-woven fabric is laid on the ground 0, and the water-permeable plate-like material of the present invention is laid out on top of it. Water-permeable reinforcing plate made of plastic net, steel mesh, etc.
) to form a water permeable space of 0. Water permeability 1 on the water permeability reinforcing plate: Cover it with a sheet-like material (4) and then fill it with earth.

In addition to the expanded metal, the semi-cylindrical body used in this example is
It is made of rigid material such as punched metal, wire mesh, or plastic net, and is folded into an arch-like or inverted V-shape in cross section, and its length generally ranges from 30 to 2.
m, rarely 305I to 1m, and the height is generally 3
~3Qaw, preferably 5-20a11. basis(
The net for 2) is usually a plastic net that has a certain degree of rigidity and flexibility, but wire mesh, expanded metal, etc. may also be used.

Its size is about 1m to 3m in width and 1m in length.
It is preferable to use a long body of several meters or more.

The semi-cylindrical bodies may be arranged closely so that they are in contact with each other, but it is better to space them at intervals of about 1 to 3051 in the front, back, left, and right directions, as shown in Figure 1. Excellent in terms of sex.

The water-permeable sheet material (4) is required to have permeability to allow water coming up from the ground to pass through, and filter properties to prevent soil from passing through.In addition, when a working machine runs on an embankment, it must be able to absorb the force from above. Since it needs to be dispersed, it is not easily cut, has high tensile strength, and is large in size, ranging from several meters to more than ten meters in both length and width. Water-permeable reinforcing plate (51) is required to have a certain degree of rigidity because it supports the force from the soil and maintains a water-permeable space, but if the ground settles unevenly, it needs to have a certain degree of rigidity so that it will fit well with the ground. It is desirable to have the flexibility of

[Example 2] A wavy annular body (6) as shown in FIG. 3 is formed by applying corrugations to an annular body made of a rigid steel plate using a method such as pressing. Continuous holes (7) are appropriately provided around the outer periphery of the wavy ring. As shown in Figure 4, these wavy ring bodies are arranged in parallel on a plane, and the adjacent ones are firmly connected using slightly large metal rings so that they can move freely to some extent to form a water-permeable disk body. form.

The wavy ring is made of a durable material such as a steel plate with a thickness of about 0.5 to 2 cm, and its size is usually 5 to 30 cm in diameter, preferably 1 cm in diameter.
0 to 2051, the width of the ring is 1 to 63, preferably 2 to 45
I, height is 3-15 cm, preferably 5-10 scratches.

The size of the plate-shaped body formed is usually 301 to 3W1.
The length is preferably 50α to 2 m, and the length is usually 1 m or more.

The construction method for this water-permeable plate-like body is the same as in Example 1.

[Example 3] A rigid band-shaped steel mesh is bent in a zigzag wave pattern to form a wavy band (mark), and a large number of these wavy bands are arranged in an upright state as shown in Fig. 5. The peaks of the first sheet and the troughs of the second sheet are arranged in parallel so that they are in contact with each other, and are connected by passing through two or more strong string-like objects such as strips 191 in a direction perpendicular to the band and are water permeable. Forms a discoid body.

If the band is too long, it will lose its flexibility as a whole, so it is made up of relatively short pieces of about 503 to 1 m, and these are connected in the longitudinal direction with ropes 19) to form a certain width. It is rare to do so.

The construction method for this water-permeable plate-like body is the same as in Example 1.

The permeable foundation of the present invention is mainly constructed as an embankment on soft ground, but since it is configured as in the above embodiment, it can be easily used even when an embankment is made and a working machine is brought in on top of the embankment. A water permeable space is secured without buckling, and the water permeable space is left almost as a cavity, so the water permeability is much better than sand, etc., and the thickness is usually around 10cIR, which is sufficient, so the cost is low. cheap. Furthermore, since the water can be drained both vertically and horizontally, it does not become clogged and partially impossible to drain, unlike when using pipes.

Since both the top and bottom are protected by filters, it is difficult for dirt to enter the internal space.

In addition, although the main body of the plate-like body that maintains the permeable space is made of a highly rigid material, the overall structure has been given a certain degree of flexibility so that it can follow uneven ground and uneven subsidence. ing. Furthermore, since the plate-shaped body is constructed to a certain size in consideration of workability, efficiency in transportation and construction is good.

1. In the present invention, it is preferable that the water-permeable sheet material to be laid directly on the ground has a size as large as possible, so it is preferable to construct it independently. The disk-like body/water-permeable reinforcing plate and the water-permeable sheet-like material covering thereon do not necessarily need to exist independently, and may be formed in whole or in part in advance. Further, a rigid water-permeable sheet material may be used as both the water-permeable reinforcing plate and the water-permeable sheet material.

Furthermore, if the strength of the water-permeable sheet placed on the bottom is insufficient, it may be reinforced with a net-like material.

Furthermore, the structure of the water-permeable plate itself is not limited to the examples, but as long as it is formed from a collection of three-dimensional structures that have pressure resistance from above and are water-permeable vertically and horizontally, the material can be used. Regardless of shape.

[Brief explanation of drawings]

FIGS. 1, 4, and 5 are perspective views showing examples of the water-permeable plate-like body. FIG. 2 is a detailed cross-sectional configuration diagram showing the construction status. FIG. 3 is a perspective view of the wavy ring. A: Permeable plate-like body, B: Ground, C: Permeable space. D... Embankment, 1... Semi-cylindrical body, 2... Base, 3...
...Metal ring, 4...Water permeable sheet material, 5...Water permeable reinforcing plate. 6... Wavy ring body, 7... Connecting hole, 8... Wavy band body, 9... Rope 11

Claims (1)

[Claims] (1) A large number of three-dimensional structures that have water permeability vertically, vertically and horizontally are placed next to each other or laid out horizontally at appropriate intervals and connected using connecting metal fittings, string-like objects, net-like objects, etc. The water-permeable plate-like bodies made of these materials are laid out on top of a water-permeable sheet material made of woven or non-woven fabric laid on the ground, and then a water-permeable auxiliary board made of plastic net or the like is laid on top of this. A method of forming a permeable foundation for embankment by covering the top with a permeable sheet material. ■ A large number of three-dimensional structures that have water permeability vertically, vertically and horizontally are placed next to each other, or laid out horizontally at appropriate intervals, and connected using connecting metal fittings, string-like objects, net-like objects, etc. A water-permeable disk-like body.