JPS62174414A - Cement plate having water-permeable function - Google Patents

Abstract

PURPOSE:To provide simply a water-permeable portion by constructing a light- weight retaining wall manually by a method in which ribs with an inwardly widened rectangular groove having widened outer face are provided for one side of a cement plate. CONSTITUTION:A cement plate consists of a plate 2 provided with several parallel ribs 1 whose one sides are the same in height. Projected and recessed portions 3 for mutually fitting are formed on sides of the cement plate 2, and the outer face of the rib 1 is widened and an inwardly widened rectangular groove 4 is formed between the ribs 1. A bent plastic net 5 of small mesh is set in the groove 4 to form a water-permeable portion. Connectors 6 are provided to the outside of the nets 5. Since the cement plate having the water- permeable portion is used, light-weight retaining walls can be constructed manually and its construction cost can be reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cement board having a water permeability function used in civil engineering and construction.

[Conventional technology]

When constructing a conventional concrete retaining wall, the back side of the retaining wall is covered with chestnut stone, sand, water absorption pipes, etc. to reduce the water pressure on the back side.
We have installed water-permeable materials such as water-permeable mats. Also, to prevent those permeable materials from being compressed by earth pressure,
Grooves have been formed in the concrete where the permeable material will be installed. In the case of secondary concrete products as well, a method has been used in which a recess is provided on the back surface and a water-permeable material is attached to the recess.

[Problem that the invention sought to solve] However, these conventional technologies are not suitable for construction of concrete retaining walls cast on site or heavy secondary products, which are lightweight materials that can be worked by hand. It wasn't.

In addition, the method of forming the concave part in which the water-permeable material is installed is to create a convex part on the formwork and recess that part, so it is not possible to form a reverse taper because of the need to remove the formwork. As a department, it was insufficient. Gluing, tape, and other means were necessary to install the water-permeable material. Furthermore, if continuous recesses are provided, the strength of the concrete decreases by the depth, which requires a thick structure as a whole, which is disliked.

This invention solves the drawbacks of such conventional retaining wall materials,
The object of the present invention is to provide a cement board that is lightweight, can be constructed by hand, has sufficient water permeability, can be easily attached with water permeable material, and does not have the problem of strength reduction.

[Means for solving problems]

For this purpose, the main feature of the present invention is to use a fiber-reinforced extruded cement board as a base material, and to form a water-permeable portion during the extrusion process.

Extrusion-molded cement is formed by extruding low-slump mortar under high pressure, and is reinforced with fibrous material such as asbestos and cured in a high-temperature autoclave, so it has excellent compressive and tensile strength, and has excellent compressive and tensile strength. Even an extremely thin plate of approximately 3c+n exhibits sufficient strength. Furthermore, since it is extrusion molded, its secondary cross section can be designed quite freely, and hollow parts, deep and wide grooves, etc. can be molded.

This invention takes advantage of the characteristics of extruded cement, uses a thin plate, uses multiple ribs parallel to each other to reinforce the strength of the plate, and creates water-permeable areas between the reinforcing ribs. It forms the

When a hollow plate is used as a base material, a water absorption hole penetrating from one side of the surface plate to the hollow hole is added by secondary processing, and the hollow hole is used as a water permeable part.

When using a plate consisting of a single surface plate as a base material, the ribs are made thicker on the outer surface side, and a groove is formed between the ribs that is wider at the back, and this groove is used as a water permeable part. The thin gaps between the ribs serve as water absorption holes.

The water-permeable portion provided in this manner may be left as a cavity, or may be filled with a material with good water-permeability to prevent clogging with earth and sand. Items to be loaded include, for example, a long and narrow bag made of a water-permeable sheet filled with granules such as sand, a plastic water absorption pipe with a fine surface, a rock material made of coconut shell fibers intertwined in three dimensions, a thick walled bag, etc. Materials commonly used as water-permeable materials, such as nonwoven fabric, can be used.

Furthermore, instead of filling the inside with a water-permeable material, a nonwoven fabric or the like may be attached to the outside of the water absorption hole to prevent the inflow of earth and sand.

This does not negate the use of water-permeable materials in combination.

In order to drain the water that has entered the water permeable part, it is further advantageous if a small drainage hole is provided below the surface of the plate, leading to the water permeable part. You may also insert a PVC pipe or the like into the drainage hole to make it protrude.

Since it is extruded, the side edges can be polished to match the length, and long products can be easily produced.

Furthermore, the surface of the plate may be decorated in advance by applying a rib pattern during extrusion, applying an embossed pattern by secondary processing, or applying glaze.

Although extrusion molding is most suitable for producing the plate of this invention, it can also be formed by a spuncrete manufacturing method, and is particularly suitable for molding large-sized products.

[Effect]

Since the present invention is constructed as described above, the plate body is lightweight and can be constructed by hand.

Cement itself has strength, and the cross-sectional structure that makes use of ribs provides strength, so this type of cement board can be used for embankment retaining walls, etc. Since a water-permeable part is provided on the back side of the cement board itself, it is advantageous when used for a retaining wall because the water pressure on the back side can be reduced.

In addition, extrusion molding allows the formation of ribs with a so-called reverse taper, which is narrow at the base and wide at the outside, so when setting water-permeable materials, there is no need for nailing, gluing, or pasting tape as in the past, and it can be set with one touch. Workability is extremely good. In addition, the permeable material is protected within the permeable part and is not directly subjected to earth pressure, so there is no drop in permeability.

Furthermore, by providing ribs with different functions, some of the ribs can be used to form a water-permeable part, and other ribs can be used to fix the plate.

[Example 1] A plate body 2 as shown in FIG. 1 is formed from an extruded cement plate, with several ribs 1 having the same height and parallel to each other integrally attached to the main body on one side. Concave and convex grooves 3 that fit into each other are attached to the side edges of the plate. As shown in the figure, the ribs have a wide outer surface, and a deep rectangular groove 4 is formed between the ribs. In each groove, a bent plastic net 5 with a fine mesh is set over the entire length to constitute a water permeable part. Connectors 6 as shown below are attached to the outside of the net at appropriate locations.

A connecting device 6 is shown in FIG. 2, in which a connecting plate 9, which projects outwardly and has a connecting hole 8, is attached to the center of a locking plate 7 made of a steel plate that fits inside the groove 3. This connector is used when constructing a board by connecting it to a tension member such as a tie rod.

The size of the board is usually 1 to 5 m in length and 0.3 to 1 m in width.
m, the thickness of the substrate is 1~3cm, the height of the rib is 5~1Qc
m, the width of the rib is about 3 to 10 marks.

The spacing between the ribs is usually 5 to 3 Qcm.

[Example 2] A hollow plate body 11 having a plurality of parallel hollow holes 10 as shown in FIG. 3 was formed using an extruded cement plate, and water absorption holes 12 penetrating the hollow holes were formed on one side of the hollow plate body 11 as shown in FIG. Provide many.

When constructing this hollow plate body 11 as a retaining wall, the fourth
As shown in the figure, a water-permeable mat 13 made of coconut shell is placed on the back side of the hollow plate, and then embankment 14 is performed.

[Other Examples]

In addition to the above embodiments, a few examples of cross-sectional configurations of the plate used in the present invention will be shown.

In FIG. 5, a hollow rib 15 protruding from the inside of a hollow plate is formed, and water absorption holes 12 are provided on the surface of the hollow rib.

It has great strength because the strength of the hollow plate can be utilized as is, and the hollow structure has excellent insulation performance, making it convenient for use when constructing basements, etc.

FIG. 6 shows an example of a plate having a substantially circular groove 17 with a narrow slit 16 communicating with the outside. This is convenient for installing a plastic pipe for water permeation directly into the trench.

〔Effect of the invention〕

Since the present invention is configured as described above, it has the following features.

■ Light enough to be constructed by hand, yet strong enough to be used as is for surface plates such as retaining walls.

■ The water-permeable part can be formed at the same time as the plate construction, and when used as a retaining wall, it is possible to reduce the back water pressure, so the construction cost is low.

■ The water-permeable part uses ribs to increase the strength of the plate, and is economical because it is not specially formed.

■ The strength of the plate is designed by the surface plate and ribs, so
Due to the formation of water-permeable parts, there is no concern about strength reduction as in the conventional case.

[Brief explanation of drawings]

Figures 1, 5, and 6 are plan sectional views showing the configuration of the plate body of the present invention, Figure 2 is a perspective view of the connector, Figure 3 is a perspective view of the plate body, and Figure 4 is a hollow view. FIG. 3 is a side view showing the construction status of the plate body. 1. Rib, 2. Plate, 3. Uneven groove, 4. Groove, 5
...Plastic net, 6.. Connecting tool, 7.. Locking plate, 8.. Connecting hole, 9.. Connecting plate, 10.. Hollow hole, 11
...Hollow plate body, 12..Water absorption hole, 13..Water permeable mat,
14... Embankment, 15... Hollow rib, 16... Slit,
17...Circular groove.

Claims (6)

[Claims] (1) Water permeable between the ribs of a hollow or ribbed plate made of a ceramic product and consisting of at least one surface plate and a plurality of mutually parallel ribs integrally attached to the surface plate. A cement board having a water-permeable function characterized by being provided with a section. (2) A cement board having a water-permeable function as set forth in claim (1), wherein the water-permeable portion is loaded with a water-permeable material. (3) Claims (1) to (3) characterized in that a water-permeable sheet material is attached to the outer surface of the water-permeable part.
2) A cement board having a water-permeable function as described in item 2). (4) A cement board according to claims (1) to (3), characterized in that the board is an extruded cement board. (5) Claims (1) to (4) characterized in that the plate is a hollow plate, and at least one surface plate is provided with a water absorption hole that penetrates the hollow hole. A cement board having the water permeability function described above. (6) The plate has multiple ribs that widen on the outside,
A cement board having a water-permeable function according to claims (1) to (4), characterized in that a water-permeable portion consisting of a deep and wide groove is provided between the ribs.