JPH08317730A - Water-retention mat for construction of roof covered with soil - Google Patents

Abstract

PURPOSE: To provide a less expensive water-retention mat capable of having sufficient water retaining function and easy in applying when used for a struc ture capable of raising trees or lawn for greening a rooftop or a balcony. CONSTITUTION: This is a structure for greening a rooftop (or a balcony) of a building by planting trees or lawn S on it. A water tight layer 1, a water retaining layer and a lightweight artificial soil layer 3 are formed in a serial order from the floor of the rooftop. In this structure, the water retaining layer is formed by laying a sheet-shaped water-retention mat 2 having a water storing function. The water-retention mat 2 has protrusions 2a of nearly chevron shape in a side view and of grid shape in a plain view on the surface. Recessed parts 2c are formed between the protrusions 2a. The water supplied on the lightweight artificial soil 3 having high water draining function is stored at the recessed parts 2c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a water retention mat in a soil-covered roof structure capable of planting a lawn or the like on the roof or balcony of a building.

[0002]

2. Description of the Related Art Conventionally, in a building or a house having a rooftop or a balcony, the space on the rooftop or the balcony is effectively used, and the rooftop or the floor of the balcony is used to utilize the natural wind and light. The technique of spreading soil, planting trees, planting a lawn and greening is known. In order to grow trees and lawns for greening the rooftop and the like, it is important to ensure the water retaining performance of the soil, and to ensure the durability of the rooftop and the like, waterproof performance is required. For example, as shown in FIG. 5, the planted portion on the roof (or balcony) has a waterproof layer 21, a root preventive layer 22, a drainage layer 23, and a water retaining layer 2 in order from the top surface of the roof slab (concrete floor) 20.
4 and soil (or artificial lightweight soil) 25 on it
By spreading the grass S and planting the lawn S, the water that has permeated from the soil 25 is stored through the water retention layer 24 to retain the water necessary for growth, and the water retention capacity of the water retention layer 24 is exceeded. The moisture is guided to the drainage port through the drainage layer 23 and drained, and the root of the lawn S passes through the waterproof layer 2 through the root protection layer 22.
No. 1 is not damaged, and water is prevented from permeating the concrete part, so that the lawn S can be grown.

[0003]

However, the structure according to the above-mentioned prior art is premised on the use of a large-area rooftop such as a building, and it is too costly to use it on the rooftop or balcony of a house. There was a problem. That is, since it is a five-layer structure of the waterproof layer 21, the root preventive layer 22, the drainage layer 23, the water retaining layer 24, and the soil 25 in order from the upper surface of the roof slab 20, the configuration is complicated and the construction takes time,
Not only did this lead to an extension of the construction period, but the number of component members was large and the cost was high. Therefore, an object of the present invention is to provide a water-retaining mat that secures a sufficient water-retaining effect, is easy to construct, and is inexpensive in a structure capable of growing trees and lawns for greening rooftops and balconies.

[0004]

[Means for Solving the Problems] As a means for solving the above problems, the present invention has a structure in which lawns and trees are planted on the rooftop or balcony of a building for greening. A waterproof layer and a water retention layer are formed in order from the upper surface, and in a configuration in which high drainage soil is spread on the upper surface of the water retention layer, it is possible to lay a sheet-like water storage mat to form the water retention layer, On the surface of the mat, a protrusion having a substantially mountain shape in a side view and a grid shape in a plan view is formed, and a recess is formed through the protrusion, and the recess is supplied to the highly drainage soil. In addition to being able to store water, the height of the protrusions can be changed to adjust the amount of water retention, and when the mat is laid, it is cut into a desired shape and placed at the edge of the adjacent mat. Stack the protrusions and connect It is obtained by a configuration in which bonded at the tape.

[0005]

With this configuration, for example, when a lawn or trees is planted on the rooftop to form a garden and the garden is used for greening, a plurality of recesses are formed on the upper surface of the water retention mat through the protrusions. Since it can retain water, it is possible to always maintain the highly drainage soil in an optimum state. Also, when constructing a water retention mat, cut it to a desired size and stack the protrusions located at the edges of adjacent water retention mats,
All you have to do is attach them with adhesive tape.

[0006]

Embodiments of the present invention will now be described with reference to the accompanying drawings. 1 is a side sectional view showing an embodiment of the present invention, FIG. 2 is a perspective view of the same, FIG. 3 is a plan view of a water retention mat, and FIG. 4 is an enlarged plan view of a corner portion of the water retention mat shown in FIG. It is a side view.

In FIGS. 1 and 2, a rooftop garden A of a building has a garden with a covered roof structure, and the garden is a tree T.
And a lawn S are planted. A waterproof layer 1 having root resistance is formed on the upper surface of the concrete floor 10 (roof slab) on the rooftop A, and a water retaining mat 2 is disposed on the waterproof layer 1 to form a water retaining layer. There is. A lightweight artificial soil 3 (or soil) having a high drainage property is laid on the water retention mat 2.
A tree T and a lawn S are planted in the lightweight artificial soil 3. Water is supplied to the lightweight artificial soil 3 by rainwater or irrigation, and the water is spread over the entire lightweight artificial soil 3 and supplied to the trees T and the lawn S.

As shown in FIGS. 3 and 4, the waterproof mat 2 is formed of a rectangular sheet-like member such as hard vinyl chloride, and its surface projects upward from the lower surface side in a side view. The projections 2a, 2a
.. are formed, the protrusion 2a has a chevron shape in side view, and the skirts 2b and 2b thereof are curved. Recesses 2c, 2c ... Are formed through the protrusions 2a, 2a .. The recesses 2c, 2c ... Are supplied by rainwater or irrigation and penetrate from the lightweight artificial soil 3. It is configured to store water and improve the water retention effect.

Then, the recesses 2c and 2 of the water retaining mat 2 are formed.
The remaining water that cannot be stored in c ... flows through the light-weight artificial soil 3 and is quickly drained on the rooftop A.
It can be discharged to the outside through a drainage pipe connected to it. The drainage section 6 has a lightweight artificial soil 3
A drain filter (hemimarone) 9 having a size smaller than the particle size is disposed as a drainage layer to prevent the lightweight artificial soil 3 from flowing into the drainage section 6 and the drainage pipe.

When constructing the sheet-shaped water retaining mat 2, a predetermined number of sheets are prepared according to the area of the garden on the roof A, cut into a predetermined shape, and laid on top of each other. As an example, if the size of the sheet is shown, as shown in FIGS. 3 and 4, the vertical X is 10
20mm, width Y is 1520mm, height h of the protrusion 2a
And the width z of the hem is 6 mm, and the vertical and horizontal x of the recess 2c
The length of y (the length from the top of the protrusion 2a to the top) is set to 100 mm.

By changing the height h of the protrusion 2a, the water retention amount can be adjusted according to the conditions such as the difference in rainfall amount depending on the region and the type of plant to be planted. There is. Width w on the four sides of the water retaining mat 2
10 mm edge portions 2d, 2d ... Are provided, and those portions (the edge portions when cut and used) are overlapped when laying the water retention mats 2, 2, ... The tapes and the like are used to bond them together so that they will not be displaced when they are laid or when the lightweight artificial soil 3 is spread.

As described above, since the water is retained by the plurality of recesses 2c formed through the protrusions 2a on the upper surface of the water retention mat 2 in the soil roof structure, the lightweight artificial soil 3 is always in the optimum state. It can be maintained, and the lawn S and the tree T can be configured not to die due to lack of water. In addition, by using the lightweight artificial soil 3, it is possible to reduce the weight and prevent the structure from being overloaded.

Further, a net 13 for supporting the tree T (for example, a portion having a width of 1000 mm from the handrail) is provided on the upper surface of the water retaining mat 2 where the tree T is planted. The configuration of the present embodiment can also be used when a lawn is planted on the balcony and is used as a tree. Further, by embedding the water supply hoses 4, 4 ... In the lightweight artificial soil 3 on the water retention mat 2,
It is also possible to adopt a configuration in which the lawn S can be grown by automatically supplying water to the lightweight artificial soil 3 via 4 ...

[0014]

Since the present invention is configured as described above, it has the following effects. That is, the water retention mat 2 having a plurality of recesses formed via protrusions protruding in a lattice pattern is laid on the upper surface of the waterproof layer, and a lightweight artificial soil is spread on the upper surface to retain water. Since it is also possible to adjust, it is possible to adjust the water retention amount according to the conditions such as the difference in rainfall amount depending on the region and the type of plant to be planted, so that the high drainage soil can always be maintained in the optimum state, It is possible to obtain the water necessary for growing trees and lawns, prevent trees and planted lawns planted in the lightweight artificial soil from dying due to lack of water, and eliminate adverse effects on the growth of trees and lawns. be able to.

Further, the water-retaining mat is formed into a sheet, and the projections in the form of a lattice are provided so that the water-retaining mat can hold water, so that the shape is simple and the manufacturing cost can be reduced. In addition, when constructing the water retention mat, its shape is simple, so it can be easily cut with scissors etc. according to the laying position, and the grid-shaped projections serve as a measure, so the cutting position can be easily determined. be able to.
Furthermore, at the time of construction, the water retaining mat can be easily cut into a desired size as described above, the protrusions located at the edges of the adjacent water retaining mats can be overlapped, and the adhesive tape can be used for bonding. It is possible to prevent the occurrence of deviation during and after installation, facilitate handling, facilitate construction, improve workability, and reduce construction cost.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view of the same.

FIG. 3 is a plan view of a water retention mat.

FIG. 4 is an enlarged plan view and side view of a corner portion of the water retention mat shown in FIG.

FIG. 5 is a side sectional view showing a conventional example.

[Explanation of symbols]

 1 Waterproof layer 2 Water retention mat 2a Projection 2c Recess 3 Lightweight artificial soil A Rooftop S Lawn T Tree

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuya Kusobe 4-2-1 Kawaramachi, Chuo-ku, Osaka-shi, Osaka

Claims (3)

[Claims] 1. A structure in which a lawn or a tree is planted on a roof or a balcony of a building for greening, and a waterproof layer and a water retention layer are formed in order from the upper surface of the roof or balcony floor, and a high layer is formed on the upper surface of the water retention layer. In the structure that spreads drainage soil,
A water retention mat in a soil-covered roof structure, wherein a water retention layer can be formed by laying a sheet-like water storage mat. 2. The mat according to claim 1, wherein protrusions having a substantially mountain shape in a side view and a lattice shape in a plan view are formed on the surface of the mat, and the recesses are formed through the protrusions. ,
A water retention mat in a soil-covered roof structure, characterized in that it is possible to store the water supplied to the highly drainage soil in the recess and to adjust the water retention by changing the height of the protrusion. 3. When the mat according to claim 2 is laid, the mat is cut into a desired shape, the protrusions located at the edges of the adjacent mats are overlapped, and the mats are bonded with an adhesive tape. A water retention mat for a covered roof structure.