JP4264162B2 - River vegetation revetment method and river vegetation revetment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a river vegetation revetment method and a river vegetation revetment.
[0002]
[Prior art]
For example, when embankment of river dike slopes, conventionally, from the standpoint of disaster prevention, a block construction method that sticks concrete blocks to the dike slopes, or a block that sticks concrete blocks to non-woven fabric and sticks them to the slopes The mat construction method has been constructed, but in recent years, there is a demand for the formation of a revetment by lawn from the viewpoint of landscape such as the formation of a water revetment and from the viewpoint of cost.
[0003]
[Problems to be solved by the invention]
Therefore, the method of constructing lawn mats grown in the field on the slope of the river surface of the river has been adopted, but because the lawn mat was simply attached to the slope, For example, when the river is inundated, the lawn mat is easily peeled off and washed away, and the revetment function is lost early and the slope is eroded by running water. There was a problem that was likely to occur.
[0004]
The above problem is particularly noticeable immediately after the construction of the lawn mat. At the stage where the lawn mat was attached to the slope, it was attempted to fix the lawn mat to the slope with an anchor or the like. Since the shape retention strength of the lawn mat itself is weak, the anchoring part of the anchor collapses when it receives running water, and the lawn mat will come off the anchor and eventually peel off from the slope. It was.
[0005]
On the other hand, as shown in FIG. 9, the present inventor installs a net material 21 on the slope N, stretches a lawn mat 22 on the net 21, and attaches the lawn mat 22 to the slope N by an anchor 23 or the like. They tried to fix river vegetation revetment.
[0006]
According to this construction method, by waiting for the growth of the lawn mat 22, the strong surface layer root of the lawn mat 22 eventually entangles with the net material 21, so that the penetration depth of the lawn root into the slope N is increased. Even if it is shallow, river vegetation revetment with high resistance to running water, that is, river vegetation revetment strong against peeling from slope N, is achieved, but the problem immediately after construction could not be cleared.
[0007]
The present invention has been made in view of such circumstances, and an object thereof is to use a vegetation mat that makes it difficult to collapse and can be firmly attached to, for example, a river slope. River vegetation revetment method and river vegetation revetment are provided.
[0008]
[Means for Solving the Problems]
The present invention that has achieved the above object is a river vegetation revetment construction method in which a vegetation mat is arranged in a river revetment area, and at least two opposite net portions of a flexible net material are lawn. The vegetation mat is formed by integrating the lawn mat with the net material in a state of protruding from the end of the mat,
Overlay the net part of the adjacent vegetation mat from the end of the lawn mat on the upstream vegetation mat on the net part of the vegetation mat on the downstream side. A river vegetation revetment construction method characterized by stretching is provided (claim 1). Moreover, this invention provides the river vegetation revetment constructed by the river vegetation revetment construction method of Claim 1 from another viewpoint (Claim 2).
[0009]
The vegetation mat is manufactured as follows, for example. That is, a flexible net material is laid in the field, and a lawn mat grown separately on the net material is laid on the net material, and the lawn mat is attached at the stage where the roots of the lawn mat are entangled with the net material. Remove the net material from the field.
[0010]
According to this manufacturing method, a vegetation mat having a high shape-retaining property in which a strong surface root of the lawn mat is firmly entangled with the net material is obtained, and the vegetation mat is spread on a slope or the like. Alternatively, if the net material is fastened with an anchor or the like, the lawn mat is firmly entangled with the net material, so the lawn mat can be substantially firmly attached to the slope etc. via the net material. The lawn mat can be firmly rooted on the slopes over time.
[0011]
Therefore, for example, when the vegetation mat is used for river vegetation revetment on the river slope, even if the river increases immediately after construction, the vegetation mat is not easily peeled off by running water, In addition to being excellent on the landscape, erosion of the slope due to running water is also effectively prevented.
[0012]
In the present invention (Claim 1), for example, the growth on the two opposite side portions of the lawn mat is not performed, or the two opposite side portions of the lawn mat are destroyed, for example. By taking measures, at least two opposing net portions of the net material are projected from the end of the lawn mat.
[0013]
Therefore, the net part of the adjacent vegetation mat that protrudes from the end of the lawn mat on the upstream vegetation mat overlaps the net part that protrudes from the end of the lawn mat on the downstream vegetation mat from above. Therefore, when the water is increased, the edge of the net material does not oppose the flowing water, and the water flows smoothly, and the vegetation mat is prevented from peeling off more effectively.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the situation of a river vegetation revetment on a slope such as a river bank, and FIG. 2 shows a vegetation mat 1 used for the river vegetation revetment. In FIG. 1, R in the figure is the direction of water flow.
[0015]
The vegetation mat 1 has a rectangular shape of, for example, 2000 mm × 3000 mm, and is formed by integrating a lawn mat 3 with a flexible net material 2. Specifically, as shown in FIG. A flexible net material 2 is laid on the field 4, a lawn runner 5 is sprinkled on the net material 2 and covered with soil 6, and the runner 5 grows and the grass roots are net material 2. When the runner 5 grows on the lawn mat 3, the net material 2 is peeled off from the field 4 while cutting the root extending below the net material 2. A vegetation mat 1 in which a lawn mat 3 is integrated with 2 is manufactured.
[0016]
And in this embodiment, by arranging the squares and the like around the net material 2 and producing the vegetation mat 1, by removing the squares 7 and the like on both sides in the width direction of the vegetation mat 1, for example, The net portions 2a and 2b having a width of 50 mm are projected, and a net portion 2c having a width of, for example, 250 mm is projected on one side of the net material 2 in the longitudinal direction. The net portion 2d is projected.
[0017]
It should be noted that the arrangement of the square members 7 and the like is omitted, and the peripheral portion of the lawn mat 3 is broken after the vegetation mat 1 is manufactured, and the net portions 2a to 2d are projected over the peripheral portion of the vegetation mat 1 as described above. You may make it make it.
[0018]
In addition, it is effective to form a dense mesh portion with a width of about 2 to 5 cm at each end of the protruding net portions 2a to 2d in order to prevent misalignment when connecting the net. .
[0019]
The flexible net material 2 is formed into a lattice shape having a mesh size of 2 to 15 mm using a fiber having high durability, such as nylon, polyester, aramid, carbon, glass, polyacetal or the like. In addition, the above-mentioned filaments made of fibers may be used to braid into a mesh body having the same mesh as described above, or both of them may be overlapped, and the tensile strength per 1 m width is 1 About 0 to 7.0 tons.
[0020]
Next, an example of river vegetation revetment on the river slope N will be described. First, as shown in FIG. 1 and FIG. 4, a water basin area or a portion where water is drenched for a considerable period of time is excavated as appropriate, and, for example, a basket mat 8 is stretched in this excavated area (others such as discarded stones and futon baskets). Is also suitable).
[0021]
At this time, a net material 9 similar to the net material 2 described above is laid on the lower side of the basket mat 8 over an appropriate width, and the upper side portion 9a is placed on the slope N side (river revetment area side) of the upper portion of the cage mat 8. ). On the other hand, the net material 10 similar to the above-mentioned net material 2 is also provided in the vicinity of the highest water level at the time of expected water increase, preferably in the river revetment area above the highest water level H as shown in the figure. The part is projected and buried.
[0022]
Furthermore, as shown in FIG. 5, the upper and lower net members 10 and 9 protrude into the river revetment area at an interval of, for example, 10 m to 30 m and a part toward the downstream side in consideration of the flow velocity at the time of water increase. As described above, the net material 11 similar to the net material 2 is embedded, and the net materials 10 and 11 are anchored to the anchors 12 as necessary.
[0023]
Then, as shown in FIG. 1, for example, the hook member 13 is hooked on one net portion 2 c in the longitudinal direction of the net material 2, and the vegetation mat 1 having the above-described configuration is used, for example, in a river revetment area using a crane 14 or the like. It is stretched on the slope N from the downstream side toward the upstream side and from the lower side to the upper side of the river revetment area.
[0024]
At this time, with respect to the vegetation mat 1 at the lower side of the river revetment area, the other net portion 2d of the net material 2 is overlapped from above on the upper side portion 9a of the net material 9 laid and protruded below the basket mat 8. Then, anchors 15 are placed on both the 2d and 9a, and the upper and lower vegetation mats 1 and 1 are placed on the upper net portion 2c of the lower vegetation mat 1 and on the lower side of the upper vegetation mat 1. The net portion 2d is overlapped from above, and the anchor 15 is driven on both 2d and 2c.
[0025]
And about the vegetation mat 1 of the river revetment area upper part, the upper side net | network part 2c is overlapped on the protrusion side part 10a of the net | network material 10 from upper direction, and the anchor 15 is driven in both these 2c, 10a. However, at this time, the upper end of the vegetation mat 1 may exceed the protruding side part 10a due to the length dimension of the vegetation mat 1, and in this case, the anchor 15 is attached to the overlapping part to the protruding side part 10a. The net material 2 may be cut, the length dimension of the vegetation mat 1 may be adjusted, and both 2c and 10a may be overlapped.
[0026]
On the other hand, for the vegetation mat 1 stretched from the downstream side to the upstream side of the river revetment area, the upstream net portion 2b of the vegetation mat 1 on the downstream side is connected to the downstream net portion 2a of the vegetation mat 1 on the upstream side. And the anchor 15 is driven on both of the two 2a and 2b, and the net member 11 is overlapped with the upstream net portion 2b of the vegetation mat 1, and the two 2b and 11 are connected. They are connected by connecting means 16 such as a coil wire rod or a swipe, the downstream net portion 2a of the upstream vegetation mat 1 is overlapped on this overlapping portion, and the anchor 15 is driven on these three members 2a, 2b, 11 To do.
[0027]
At this time, the vegetation mat 1 may exceed the net material 11 due to the width dimension of the vegetation mat 1, but in this case, the connection by the connecting means 16 is stopped and the overlapping portion to the net material 11 is anchored. 15 or the net material 2 is cut, the width dimension of the vegetation mat 1 is adjusted, the two 2b and 11 are connected by the connecting means 16, and then the three members 2a, 2b and 11 are connected. The anchor 15 may be driven.
[0028]
And about each overlapping part of the vegetation mats 1 and 1 which adjoin in the up-and-down and the left-right direction, and the overlapping part of the vegetation mat 1 and the net material 10 on the river revetment area upper side, these net materials 2, 10 is locked to the connecting bracket 17 previously embedded in the river revetment area, and covered with the lawn mat 3 so as to cover the vegetation mat 1 as necessary (see FIGS. 1, 4 and 5) 18 is applied.
[0029]
In the above embodiment, as shown in FIGS. 1 and 4, a lawn mat 19 in which the net material 2 is not integrated is stretched in the river revetment area above the embedding area of the net material 10. However, it goes without saying that the vegetation mat 1 having the above configuration may be stretched instead of the lawn mat 19.
[0030]
According to the river vegetation revetment construction method described above, the vegetation mat 1 used in the construction method is a vegetation mat 1 having a high shape retention property in which the strong surface layer root of the lawn mat 3 is firmly rooted in the net material 2. Since the adjacent net members 2 of the mat 1 are overlapped and fixed to the slope N with an anchor 15 or the like, the lawn mat 3 whose four sides are substantially connected to each other is connected to the slope via the net 2. The lawn mat 3 is firmly rooted on the slope N over time.
[0031]
Therefore, it is possible to expect uniform greening vegetation on the entire slope N, and even if the river is increased immediately after the construction of the vegetation mat 1, the vegetation mat 1 does not easily collapse or peel off due to running water. Thus, the function of a high water revetment is exhibited immediately after the construction, and not only is it excellent on the landscape, but also erosion of the slope N by running water is effectively prevented.
[0032]
In particular, since the net material 2 on the upper side and the upstream side of the adjacent vegetation mats 1 and 1 are superimposed on the net material 2 of the vegetation mat 1 on the lower side and the downstream side from above, Since the edge of the water does not oppose the flowing water, the water flows smoothly, and the peeling of the vegetation mat 1 is more effectively prevented.
[0033]
As shown in FIG. 6, the net portions 2 a to 2 d are folded to the lower surface side as the connecting structure of the overlapping portions of the net portions 2 a, 2 b, 2 c, and 2 d of the net material 2, and this is locked to the connection fitting 17. The anchor 15 may be driven as necessary.
[0034]
As the vegetation mat 1, the net portions 2a to 2d are projected on the four sides of the vegetation mat 1, but the vegetation mat 1 with the net portions 2a and 2b projected on both sides in the width direction and both sides in the longitudinal direction. Even if the vegetation mats 1 with the net portions 2c and 2d protruding on the slope N are alternately arranged and anchors 15 are placed on the overlapping portions, the four sides of the lawn mat 3 are Can be connected to each other.
[0035]
[0036]
As another method for producing the vegetation mat 1, as shown in FIG. 7, a flexible net material 2 is laid on a field 4, and a lawn mat 3 separately grown on the net material 2 is grown on the net 2. It is also preferable to peel off the net material 2 with the lawn mat 3 from the field 4 at the stage where the grass mat 3 is entangled with the net material 2.
[0037]
According to this manufacturing method, since the lawn mat 3 grown in advance is used, the manufacturing time of the vegetation mat 1 is shortened by the growing period as compared with the method of growing the lawn runner 5 on the lawn mat 3. It can be done.
[0038]
In the manufacturing method of the vegetation mat 1 and the manufacturing method of the vegetation mat 1 shown in FIG. 3, for example, a vinyl sheet or the like for preventing the passage of turf roots may be laid on the lower side of the net material 2 laid on the field. For example, the vegetation mat 1 can be easily removed from the field, and, for example, about 5 to 10 mm of earth or sand or lightweight artificial soil (for example, peat moss, vermiculite, pearlite, etc.) is placed between the net material 2 and the vinyl sheet. It is also preferable to intervene, whereby the weight of the vegetation mat 1 can be reduced, the handling of the vegetation mat 1 becomes easy, and in addition, the construction efficiency can be improved.
[0039]
As yet another method of manufacturing the vegetation mat 1, as shown in FIG. 8, a flexible net material 2 is appropriately developed on, for example, a work table, and a lawn mat 3 is disposed thereon. The vegetation mat 1 can also be obtained by unifying 2 and 3 by a binding means 20 such as stapling, or by other connecting means 20 such as sewing.
[0040]
According to this manufacturing method, although the roots of the lawn mat 3 are not entangled with the net material 2, both the nets 2 and 3 are integrated by the connecting means 20. By placing an anchor on the overlapping portion of the turf, the lawn mat 3 can be substantially firmly attached to the slope via the net material 2. The roots are entangled with the net material 2 and rooted on the slope. According to this manufacturing method, in addition to using the previously grown lawn mat 3, the root of the lawn mat 3 to the net material 2 is used. Since it is not necessary to wait for the entanglement, the manufacturing time of the vegetation mat 1 can be further shortened by that amount.
[0041]
【The invention's effect】
As described above, the present invention is a river vegetation revetment construction method in which vegetation mats are arranged side by side in a river revetment area, and the net portions on at least two opposite sides of a flexible net material are connected to the end of the lawn mat. The grass mat is integrated with the net material in a state of projecting from the part to form a vegetation mat,
Overlay the net part of the adjacent vegetation mat from the end of the lawn mat on the upstream vegetation mat on the net part of the vegetation mat on the downstream side. Since it is stretched, when the water is increased, the edge of the net material does not oppose the flowing water, and the water flows smoothly, so that the vegetation mat is more effectively prevented from peeling off.
[0042]
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of the situation of river vegetation revetment against the slope of a river dike.
FIG. 2 is a perspective view of a vegetation mat taken out of a part and enlarged and illustrated in cross section.
FIG. 3 is an exploded perspective view showing an example of manufacturing a vegetation mat.
FIG. 4 is a longitudinal side view of a river vegetation revetment that is partially extracted and enlarged.
FIG. 5 is a longitudinal side view of a river vegetation revetment with a part extracted and enlarged.
FIG. 6 is a cross-sectional view of a net overlapping structure according to another embodiment.
FIG. 7 is an exploded perspective view showing an example of manufacturing a vegetation mat according to another embodiment.
FIG. 8 is an exploded perspective view showing a manufacturing example of a vegetation mat according to still another embodiment.
FIG. 9 is an explanatory diagram of the situation of river vegetation revetment comparing the present invention.
[Explanation of symbols]
2 ... Flexible net material, 2a-2d ... Net part, 3 ... Lawn mat, 4 ... Farm, 5 ... Runner, 6 ... Covering soil, 20 ... Connecting means.

Claims (2)

A river vegetation revetment construction method in which vegetation mats are arranged side by side in a river revetment area, and the net material is in a state in which the net portions on at least two opposite sides of the flexible net material are projected from the end of the lawn mat. The grass mat is integrated into a vegetation mat,
Overlay the net part of the adjacent vegetation mat from the end of the lawn mat on the upstream vegetation mat on the net part of the vegetation mat on the downstream side. River vegetation revetment construction method characterized by stretching.   A river vegetation revetment constructed by the river vegetation revetment construction method according to claim 1.

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