JP2008208694A - Civil engineering mat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide equipment and materials used in civil engineering work for promoting the settlement of earth and sands in rivers, etc. or preventing the effluence of surface soil of reclaimed lands, etc. <P>SOLUTION: The mat for civil engineering work comprises a network equipped with objects with concave surfaces. On this civil engineering mat, are installed these objects with concave surfaces at an arbitrary interval so that they are spaced from one another. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a civil engineering mat laid on rivers, slopes of slopes, landfills, and the like.

  Conventionally, various equipment and construction methods have been proposed to prevent the spread of sediment on the bottom floor of rivers, etc., or to prevent runoff of earth and sand due to rain on slopes on road sides and landfills. For example, a method has been proposed in which a net or artificial lawn is laid on a slope, covered with a block, or a block body having a protruding shape is laid on the bottom floor of a river.

  However, the conventional equipment or the construction method using the equipment has disadvantages such as being expensive, complicated installation work, and not achieving the intended purpose sufficiently. Therefore, the present inventor has made various studies on equipment that can be manufactured by simple work, can be easily transported, can be laid easily, and has excellent effects such as prevention of sediment discharge. As a result, the present invention has been completed.

  That is, the present invention relates to a civil mat and a laying method using the civil mat, characterized in that an object having a recess is provided in a net body.

  The civil engineering mat of the present invention can be easily assembled at the construction site, and also when transporting the assembled civil engineering mat, since there are few uneven parts such as protrusions, it does not take up space, When an old tire is used as an object having a recess, industrial waste can be reused and the construction is extremely simple.

Next, the civil engineering mat of the present invention will be described with reference to the drawings, but the present invention is not limited to the following description.
FIG. 1 shows a plan view of a civil engineering mat according to the present invention.
1 is a net body, 2 is an object having a recess, and 3 is a civil mat. The net body 1 used in the present invention can be made of any material such as metal and synthetic resin, and the mesh can be used in any form and shape. When the material of the net body 1 is a synthetic resin, either a hard material or a soft material can be used. However, a material having soft flexibility is preferable because the construction method described later can be performed in the construction.

Further, the net body 1 preferably has a three-dimensional structure. For example, the net body 1 integrally knitted into a structure as shown in FIGS. 2, 3 and 4 using a thread-like synthetic resin is preferable.
That is, as shown in FIG. 3, the hexagonal side A of the upper skeleton body mouth is connected to the hexagonal side L of the lower skeleton body C by the thread-like synthetic resin a (hereinafter also referred to as a filamentous body). The hexagonal side H and the side K of the lower skeleton body C are connected from the hexagonal side B of the skeleton body mouth, and the hexagonal side C of the upper skeleton body mouth and the hexagonal side J of the lower skeleton body C are connected. Is connected to the hexagonal side D of the upper skeleton body mouth and the hexagonal side Q of the lower skeleton body C to form the hexagonal side E of the upper skeleton body mouth and the hexagonal side of the lower skeleton body C. Side O and side K are connected, and a hexagonal side F of the upper skeleton body mouth and a hexagonal side M of the lower skeleton body C are connected.

As shown in FIG. 4, the net body 1 shown in FIG. 2 is knitted by a plurality of filamentous bodies A, while forming a skeleton body by knitting the upper hexagonal skeleton body mouth and the lower hexagonal skeleton body C, Thus, the upper and lower hexagonal skeleton bodies are integrally knitted so as to be connected.
Further, as another aspect, the hexagonal shape of the upper hexagonal skeleton body and the lower hexagonal skeleton body C has an advantage that the compressive strength is increased by making the shapes different from each other.

Further, as the object having a recess used in the civil engineering mat of the present invention, a so-called donut-shaped object having a hollow portion at the center as shown in FIG. The thing of the shape of the circular body which has a recessed part may be sufficient. Examples of the donut-shaped object shown in FIG. 5 include old tires.
In addition to the circular shape as shown in FIGS. 5 and 6, various shapes such as a triangle, a quadrangle, a pentagon, a hexagon, an ellipse, and a star are used as the external shape of the object 2 having the recesses. In use, these shapes can be used in appropriate combination.

Next, the civil engineering mat of the present invention will be described.
FIG. 1 is a plan view showing an embodiment of a civil engineering mat according to the present invention. An object (old tire) 2 having a concave portion is fixed to both edge portions of the net body 1 by using a string-like object, a lifting metal fitting or the like. FIG. 1 shows a case where two strips are provided in a state where objects 2 having concave portions are in contact with each other. And in the center part of the net body 1, the object 2 which has a recessed part is fixed to 2 articles | intervals, respectively, and the civil engineering mat 3 is comprised.

Moreover, as another aspect of the civil engineering mat 3, the civil engineering mat 3 can be formed by arranging the objects 2 having the recesses on the entire surface of the net body 1 so as to be adjacent to each other and being fixed by a fixing tool (not shown). )
Further, in the case where the object 2 having a recess in the net body 1 is disposed with an interval at an arbitrary position, the interval width may be appropriately selected depending on the purpose of use. The form of the interval width can be various shapes such as a linear shape, a meandering shape, and a zigzag shape.

Next, the case where the civil engineering mat 3 shown in FIG. 1 is installed on the riverbed will be described. As shown in FIG. 7, the civil engineering mat 3 is laid on the river bed 5 below the water surface 4 with the object 2 having a concave portion down. As a method of fixing the civil engineering mat 3 to the riverbed 5, for example, a pile 6 is driven into an appropriate place of the civil engineering mat 3 and fixed.
By laying the civil engineering mat 3 on the river bed 5 in this way, the earth and sand carried by the water flow 7 has a flow velocity of the water flow from the water surface 4 to the river bed 5 as shown in FIG. Deceleration (V ₁ to V ₄ ) from the water surface 4 to the river bed 5, but the degree of decrease is particularly large (V ₃ , V ₄ ) in the civil engineering mat 3 laying section. To do. The once-stagnated earth and sand does not soar even if the river flow becomes faster due to rain or the like due to the civil engineering mat 3.

用いたとき、図９に示すように、直線状に設けられた間隔部を山形の凸状部８として形成するように固定することによって該部分が水の抵抗体となり、水流の流速を減ずることができるので好ましい。

When used, as shown in FIG. 9, by fixing the linearly spaced intervals so as to form a mountain-shaped convex portion 8, the portion becomes a water resistor, and the flow velocity of the water flow is reduced. Is preferable.

Further, when the civil engineering mat 3 of the present invention is laid on a slope or a landfill surface, it is preferable to install the civil engineering mat 3 with the net body 1 facing down.
Thus, the object 2 having the concave portion is placed on the upper side by lowering the net body 2 so that the water channel flowing on the surface of the ground can be dispersed and the amount of water increases to exceed the object 2 having the concave portion. Even when it flows, the water speed is decelerated by the concave portion of the object 2 having the concave portion, and the sediment in the water stream settles and accumulates in the concave portion, so that the formation surface is not scraped off by the water flow.

  Top view of civil engineering mat   Plan view of a net body having a three-dimensional structure   An enlarged plan view of a part of a net body having a three-dimensional structure   Side view of part of net body with 3D structure   Sectional drawing which shows the one aspect | mode of the object which has a recessed part   Sectional drawing which shows the one aspect | mode of the object which has a recessed part   State diagram when civil engineering mat is laid on the riverbed   State diagram showing the state of water flow when laying civil engineering mats   State diagram showing an example of a method for laying civil engineering mats

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Net body 2 ... Object which has a recessed part 3 ... Mat for civil engineering 6 ... Pile 8 ... Convex-shaped convex part

Claims (2)

A civil engineering mat characterized in that an object having a recess is provided in a net body. The civil engineering mat according to claim 1, wherein objects having concave portions are provided with gap portions provided at arbitrary intervals.

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