JP2005146619A - Revetment construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a revetment construction method for simultaneously achieving desired protection and seeding and planting of the bare ground at a lower cost than a conventional revetment construction method. <P>SOLUTION: A net body 2 with mesh cloth is laid on the inclined bare ground 1 of a shore of a river, a lake, a dam lake, or the like, and a plurality of projecting bodies 5A (9A) formed of logs 5 or ropes with a suitable diameter are continuously or intermittently formed on the upper face of the net body 2 along a contour line. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a revetment construction method, and more particularly to a revetment construction method for revetment and greening shore slopes of rivers, lakes, dam lakes, etc. (for example, bank slopes, river low water level, etc.).

For example, when a dam is constructed in a river, sloped bare ground (a kind of slope) is formed on both sides of the dam upstream. The bare ground is washed away (also called sucking out) by the water wave (water wave) blocked by the dam, and the bare ground is eroded. In order to prevent washing out due to such water waves, conventionally, fences made of logs have been formed. According to such a fence construction, it is possible to grow a plant on an inclined surface having a gentle slope, and simultaneously achieve revetment and greening of the bare ground.
JP 2000-34731 A

  However, in the conventional revetment method, the construction cost increases, and the outflow of earth and sand between the fences cannot be completely prevented. To prevent the outflow, the vegetation grows up to a certain size. I had to wait for it. The conventional revetment method is difficult to construct on steep slopes, and there are slopes to which the method can not be applied, and even if it can be applied, there is a problem that the cost is considerably increased compared with the case of a gentle slope. . And even if construction of the above construction method is possible, there is a problem that the area where the soil is washed out becomes large, and there is a face that is not necessarily an advantageous construction method. In addition, when the slope is covered with a structure such as mortar, there is a problem in the greening landscape.

  The present invention has been made in consideration of the above-mentioned matters, and an object of the present invention is to provide a revetment method capable of simultaneously achieving desired bare ground protection and greening at a lower cost than conventional revetment methods. It is to be.

  In order to achieve the above object, the revetment method of the present invention lays a mesh body with a mesh cloth on a sloped bare ground such as a river, a lake, a dam lake, etc., and a log having an appropriate diameter on the upper surface of the mesh body. Alternatively, a plurality of convex bodies made of rope are formed continuously or intermittently along contour lines (claim 1).

  In order to achieve the above object, the revetment method of the present invention is a method of continuously or intermittently forming a plurality of fences made of logs on a bare ground inclined on the shore of rivers, lakes, dam lakes, etc. An inclined portion on the upper side of the bank is backfilled to form a substantially horizontal bank portion, and a mesh-like body with a mesh cloth is laid on the upper surface of the bank portion (claim 2).

  In any of the above revetment construction methods, the mesh body portion of the mesh cloth-attached mesh body may be constituted by a geotextile net (Claim 3), and a mesh nonwoven fabric may be used as the mesh cloth (Invoice) Item 4).

  According to the revetment construction method according to claim 1, outflow and washing out of earth and sand on the bare ground whose shoreline is inclined is suppressed by the mesh cloth with mesh cloth. A plurality of convex portions made of logs or ropes are continuously or intermittently formed on the upper surface of the net-like body, so that the sand, the water surface, or the seeds floating in the water are locked and fixed on the convex portions. In particular, the seeds are held so that the seeds settle on the mesh cloth and are preferably brought into contact with the surface of the bare ground, that is, the ground. Therefore, a vegetation environment close to the natural state can be created. That is, according to the revetment method of the present invention, the bare ground is suitably greened in a state in which it is in harmony with the surrounding nature.

  In the revetment method, a mesh body with mesh cloth is laid on an inclined bare ground, and a log palm rope made of, for example, thinned wood is disposed on the top surface of the mesh body, and a plurality of mesh body is disposed on the top surface of the mesh body. Since it is only necessary to use a very inexpensive material that continuously or intermittently forms the convex body along the contour line, it can be constructed at low cost regardless of the slope of the bare ground. On steep bare ground, it can be constructed at less than half the cost of this type of revetment method.

  That is, according to the above-mentioned revetment method, the bare ground with sloping shores of rivers, lakes, dam lakes and the like can be greened in a state that is in harmony with the surrounding nature and inexpensively.

  And, according to the revetment method described in claim 2, when compared with the revetment method described in claim 1, the construction content is slightly complicated and the material cost is increased, but in terms of greening of bare ground The effect similar to the revetment method of Claim 1 can be show | played.

  In addition, as described in claim 3, when the net-like body portion is made of a geotextile net, it can suitably withstand an impact caused by driftwood or the like at the time of water increase. Furthermore, as described in claim 4, when the mesh cloth made of mesh nonwoven fabric is used, the fixed seeds can be held so as to be preferably in contact with the surface of the bare ground, that is, the ground. And can create a natural vegetation environment.

  1 to 3 show a first embodiment of the present invention, for example, a revetment method applied to an inclined bare ground formed on the upstream side of a dam lake constructed in a river. First, in FIG. 1, reference numeral 1 denotes an inclined bare ground formed on the upstream side of a dam. 2 is a mesh cloth with a mesh cloth laid on the bare ground 1, and is made of, for example, a geotextile net with a mesh nonwoven fabric (hereinafter referred to as a geotextile with a mesh nonwoven fabric), as shown in FIGS. 2 (A) and 2 (B). Further, the mesh nonwoven fabric 4 is attached to one surface of the mesh body 3, and the mesh nonwoven fabric 4 is laid on the bare ground 1 so as to be in contact with the bare ground 1.

  That is, the net-like body portion 3 has a rectangular shape in plan view, and uses an appropriate material such as animal fibers, plant fibers, synthetic resin fibers such as polyethylene and polypropylene, and the mesh 3a has a 20 mm square, for example. It is braided to become. The mesh nonwoven fabric 4 is made of the same material as that of the mesh body portion 3 and is considerably smaller than the mesh 3a of the mesh body portion 3 and prevents the outflow of earth and sand to some extent and does not hinder the growth of germinated plants. A large number of small holes 4a having a certain diameter (for example, several mm) are formed.

  5 is a log having a diameter of about 10 cm, for example, which is placed on the upper surface of the geotextile 2 with mesh nonwoven fabric attached to the bare ground 1, and is cut into an appropriate length (for example, 3 to 5 m). Timber that may be used as waste material, thinned wood obtained in the vicinity of the bare ground 1 to be constructed, and the like can be suitably used. Reference numeral 6 denotes an anchor pin for fixing and holding the log 5 in a predetermined state on the geotextile 2 with a mesh nonwoven fabric.

  Next, an example of the construction procedure will be described with reference to FIG. 3 as well, as shown in FIG. 1, on the bare ground 1 inclined on the shore of the dam lake, as shown in FIGS. A plurality of the mesh nonwoven fabric-attached geotextnets 2 are laid so that the mesh nonwoven fabric 4 is in contact with the bare ground 1. In this case, although not shown in the figure, it is preferable to fix each geotextile 2 with mesh nonwoven fabric to the bare ground 1 using an appropriate anchor pin. In addition, it is preferable to level the ground so that the unevenness on the bare ground 1 is as small as possible before laying the geotextile 2 with the mesh nonwoven fabric.

  Next, on the geotextile 2 with mesh nonwoven fabric laid on the bare ground 1, for example, a log 5 having a diameter of about 10 cm × 3 m is continuously provided along the contour line (see FIG. 3A), or And arranged in a zigzag pattern (see FIG. 5B). In this case, a plurality of convex bodies 5A are continuously or intermittently formed on the bare ground 1 on the geotextile 2 with mesh nonwoven fabric so as to follow the contour lines. And each log 5 is fixedly held in a predetermined state on the geotextile 2 with mesh nonwoven fabric by driving anchor pins 6 into the lower slope side of the bare ground 1 of each log 5.

  In the bare ground 1 after the construction, even if the water level of the dam lake rises and covers the bare ground 1 as shown by reference numeral 7 in FIG. Since it is covered with 2, the outflow and washing out of the earth and sand on the bare ground 1 are suppressed. And since the several convex-shaped part 5A which consists of several logs 5 is formed in the upper surface of the geotextile 2 with a mesh nonwoven fabric continuously or intermittently, earth and sand, a water surface, or underwater is carried in this convex-shaped part 5A. For example, floating seeds such as American Sendosa and Onamomi are anchored and fixed to the mesh nonwoven fabric 4 of the Geotextnet 2 with mesh nonwoven fabric, and the vegetation board 8 is placed on the inclined high side of the convex portion 5A by the soil and sand that has been anchored and fixed. And the seeds can germinate and grow appropriately. In this case, the seeds are fixed to the mesh nonwoven fabric 4 and are held so as to be preferably in contact with the surface of the bare ground, that is, the ground. Therefore, a vegetation environment close to the natural state can be created. That is, according to the revetment method of the present invention, the bare ground 1 is suitably greened in a state of being in harmony with the surrounding nature.

  The present invention is not limited to the above-described embodiments, and can be implemented with various modifications. That is, FIG. 4 shows a second embodiment of the present invention. In this embodiment, the rope 9 is arranged along the contour line on the geotextile 2 with mesh nonwoven fabric, and the first embodiment is shown. Similarly, a convex portion 9A is formed on the geotextile 2 with mesh nonwoven fabric. As the rope 9 used here, a rope that is inexpensive and excellent in flexibility and water retention is preferable, such as a coconut rope. A predetermined convex portion 9A can be formed along the line. Moreover, since the rope 9 has water retention, it is possible to prevent the grown plant from drying and withering.

  As described above, the convex portions 5A and 9A formed by the logs 5 and the ropes 9 may be formed continuously or intermittently along the contour lines on the geotextile 2 with mesh nonwoven fabric. The convex portions 5A and 9A may be formed as shown in FIGS. That is, FIG. 5A shows the convex portions 5A and 9A arranged on a loose V-shape. Moreover, as shown to the same figure (B), the log 5 may be cut | disconnected shortly and you may make it stand up on the geotextnet 2 with a mesh nonwoven fabric like this as a cylinder.

  By the way, in each Example mentioned above, although the geotextnet 2 with a mesh nonwoven fabric was spread | arranged so that the bare bare ground 1 might be covered, as shown in FIG. 6, the plurality which consists of the log 10 of an appropriate diameter and an appropriate length The barrier 11 is continuously or intermittently formed, and the inclined portion on the upper side of the fence 11 is backfilled to form a substantially horizontal bank portion 12. On the upper surface of the bank portion 12, the geotextnet 2A with mesh nonwoven fabric is provided. May be laid. At this time, if the geotextnet 2A with mesh nonwoven fabric is laid so as to be continuous from the back side of the fence 11, washing out is more effectively suppressed. Reference numeral 13 denotes a pile driven into the bare ground 1 to hold the log 10.

  In the revetment construction method according to this embodiment, the construction content is slightly more complicated and the construction cost is increased as compared with the revetment construction method of the above-described embodiment, but the gradient of the bare ground 1 is relaxed, so that the growth of the plant is easy. There is an advantage that it is performed. In addition, it cannot be overemphasized that what was comprised similarly to the thing in the Example shown in FIGS. 1-5 may be used for 2 A of mesh nonwoven fabrics and the log 10 used in this Example.

  In addition, you may stick the seed for greening conventionally used, the seed extract | collected on the construction site, etc. to the mesh nonwoven fabric part of the geotextnet 2A with a mesh nonwoven fabric as needed. Moreover, you may make a cut | interruption suitably in 2 A of geotextiles with mesh nonwoven fabric, and plant seedlings, such as a tree, in the location. In these cases, early greening is possible.

It is sectional drawing for demonstrating the revetment construction method concerning 1st Example of this invention. An example of the mesh cloth with a mesh cloth used with the said revetment method is shown, (A) is a perspective view, (B) is a top view which expands and shows a part. The example of arrangement | positioning of the log used with the said revetment method is shown, (A) is a perspective view which shows the state which has arrange | positioned the log continuously, (B) is a perspective view which shows the state which has arrange | positioned the log in zigzag form. It is sectional drawing for demonstrating the revetment construction method concerning 2nd Example of this invention. It is a figure which shows the other example of arrangement | positioning of the log used with the said revetment method. It is a perspective view for demonstrating the seawall construction method concerning 3rd Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bare ground 2 Net body with mesh cloth 3 Net body part 4 Mesh cloth 5 Log 5A Convex body 9 Rope 9A Convex body 10 Log 11 Log fence 12 Bank part 13 Net body with mesh cloth

Claims (4)

  A mesh cloth with mesh cloth is laid on the sloped bare ground of rivers, lakes, dam lakes, etc., and a plurality of convex bodies made of logs or ropes with appropriate diameters are placed along the contour lines on the upper surface of this mesh body. A revetment method characterized in that it is formed continuously or intermittently.   A plurality of fences made of logs are formed continuously or intermittently on the bare ground with sloping shores such as rivers, lakes, dam lakes, etc., and the slope part on the upper side of the fence is backfilled to form a substantially horizontal bank part A revetment method characterized by laying a mesh body with a mesh cloth on the upper surface of the bank portion.   The revetment method according to claim 1 or 2, wherein the mesh body portion of the mesh cloth-attached mesh body is made of a geotextile net.   The revetment method according to any one of claims 1 to 3, wherein the mesh cloth with a mesh cloth is a mesh nonwoven fabric.

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