JP6979647B2 - Protective mat - Google Patents

Description

The present invention relates to a protective mat laid so as to cover the ground surface.

On mountain slopes, embankments, civil engineering construction sites, etc., it is common practice to cover the ground surface with a water-impervious sheet in order to prevent erosion due to rainwater and landslides. As the water-impervious sheet, a synthetic resin sheet (so-called blue sheet) such as polyethylene having a high water-impervious effect is used (see, for example, Patent Document 1). By laying such a synthetic resin sheet, it is possible to prevent rainwater from seeping into the ground, and it is possible to prevent erosion and sediment collapse at the laid place.

In addition, on cliffs and slopes, it is common to cover the ground surface with a net to prevent landslides. When such a net was laid, it was also done to enhance the effect of preventing landslides and erosion by planting in a mesh.

Japanese Unexamined Patent Publication No. 2011-49283 (see paragraph "0003" and FIG. 7)

By the way, steel towers for power transmission lines, towers such as lifts and ropeways, and utility poles are also constructed on mountain slopes. At the foot of such a steel tower (hereinafter referred to as the construction site), trees are cut down during construction and the ground surface is exposed, so it is required to prevent erosion and landslides due to the above-mentioned rainwater. There is. Therefore, synthetic resin sheets have been laid so as to cover the ground surface at construction sites such as steel towers, and nets have been laid on the ground surface for planting. However, when a synthetic resin sheet is laid at a construction site such as a steel tower, the synthetic resin sheet has a high water-impervious property, so that rainwater flows down vigorously on the sheet and the sheet is used. Since the rainwater flows out vigorously downward, there is a risk of inducing erosion or landslides below. In particular, in the case of heavy rain, a large amount of rainwater flows downward with a strong force, and there is further concern about the occurrence of erosion and landslides below.

On the other hand, the above-mentioned steel towers are also installed in the mountains where humans hardly invade. In these mountains, the planted vegetation is often eaten by wild animals such as deer. Therefore, when the net is laid and planted at the construction site such as the above-mentioned steel tower, if the planted vegetation is eaten, the rainwater that soaks into the ground from the mesh of the net causes landslides and erosion. Was likely to occur.

The present invention can suppress landslides and erosion due to rainwater at a construction site by laying it at a construction site such as a steel tower constructed on a mountain slope, and at the same time, below the construction site, from the construction site. We propose a protective mat that can prevent landslides and erosion caused by flowing rainwater.

The present invention is a protective mat laid so as to cover the ground surface, in which a base mat made of a moisture-absorbing flexible sheet and a plurality of base mats are arranged side by side at predetermined intervals on the upper surface of the base mat. It is provided with a long ridge protruding from the upper surface of the ridge and a plurality of headraces provided between adjacent ridges and capable of conducting water along the longitudinal direction of the ridge, and the ridge is hygroscopic. A long wrapping portion formed of a flexible sheet having a closed space inside, and a flexible long core material disposed in the gaps of the wrapping portion. It is a protective mat characterized by being composed of.

In such a configuration, by laying the headrace on the slope so that the direction of the headrace is at a predetermined angle with respect to the vertical direction of the slope, the water can flow downward along the slope. The rainwater can collide with the raised portion to suppress the momentum flowing below the rainwater, and the rainwater can be guided along the headrace. As a result, it is possible to prevent rainwater from flowing vigorously below the laid protective mat, and it is possible to prevent erosion and landslides from occurring below the rainwater as much as possible. Here, since the direction of the headrace is determined according to the angle at which the protective mat is laid, it is possible to appropriately determine the direction in a desired direction according to the place where the protective mat is laid, the surrounding environment, and the like. It is preferable that the direction of the headrace is toward a place where erosion or sediment collapse is unlikely to occur, which further suppresses erosion or sediment collapse due to rainwater flowing out of the protective mat. can.

Further, in this configuration, since rainwater can be sucked by the base mat and the wrapping portion of the raised portion, it is possible to suppress the rainwater from seeping into the laid ground, and the synthetic resin sheet (blue sheet) described above can be suppressed. In comparison with the above, the momentum of the rainwater flowing down can be suppressed. Further, when it rains, the weight of the whole is increased by sucking rainwater as described above, so that it is easy to be held at the laid position, and the above-mentioned action and effect can be stably exhibited in the laid state. ..

Therefore, by laying the protective mat of the present invention at a construction site such as a steel tower constructed on a mountain slope, erosion due to rainwater and landslides can be stably suppressed at the construction site, and the erosion occurs from the construction site. Erosion and landslides below the construction site due to the rainwater can be suppressed as much as possible. Further, the protective mat of the present invention can be laid according to the ground surface because the base mat and the packaging portion are made of a flexible sheet and the core material is flexible.

In the protective mat of the present invention, a plurality of upper mats made of a hygroscopic soft sheet are laminated and joined to the upper surface of the base mat, and a plurality of upper mats are projected upward at predetermined intervals. It is proposed that the ridge portion and the upper surface of the base mat form a wrapping portion of each raised portion. Here, stitching, adhesion, or the like can be applied to the joining between the base mat and the upper mat. Further, as the flexible sheet constituting the packaging portion, it is possible to use a sheet having the same water absorption as the base mat.

In such a configuration, since it has a double structure of a base mat and an upper mat, it has high strength and is not easily damaged, so that durability is improved. As a result, the above-mentioned action and effect of the present invention can be stably exhibited for a long period of time in the laid state. Further, since this configuration forms a plurality of packaging portions by joining the base mat and the upper mat, there is an advantage that the cost and time required for manufacturing can be reduced and the manufacturing can be performed efficiently.

In the protective mat of the present invention, a configuration is proposed in which a stacking allowance portion on which the upper mat is not superposed is provided on the outer peripheral edge of the base mat.

When laying a plurality of protective mats having this configuration, by arranging the adjacent protective mats so that the overlapping margins overlap each other, it is easy to arrange both without a gap. Then, by driving a predetermined iron pin into the overlapping allowances in a state where the overlapping allowances are arranged in an overlapping manner, the adjacent protective mats can be bonded to each other and fixed to the ground surface. Further, the portion where the overlapping margins of the adjacent protective mats are overlapped is not significantly thickened as compared with the bottom portion of the headrace (the portion consisting of two layers of the base mat and the upper mat). As a result, when a plurality of protective mats 1 are laid so that the headraces communicate with each other, the bottom surfaces of the headraces are relatively smoothly connected. Therefore, rainwater easily flows along the plurality of communicating headraces.

In the protective mat of the present invention, a configuration is proposed in which the flexible sheet of the base mat is a weed-proof sheet having a light-shielding property. Here, the weed-proof sheet can suppress the photosynthesis of plants and hinder the growth by blocking light and ultraviolet rays due to its light-shielding property. Such a weed-proof sheet preferably has a light-shielding rate (JIS L 1055) of 98% or more, and more preferably 99% or more.

In such a configuration, since the growth of vegetation can be prevented at the place where the vegetation is laid, it is possible to suppress the damage caused by the growing vegetation as much as possible.
Here, since the vegetation may grow with an extremely strong force that breaks through the concrete, it may be damaged by the growing vegetation in the configuration without the weed control sheet. If such damage occurs, rainwater or the like may seep into the ground at the laid position and erode the laid place (the construction place). Furthermore, if the place to be laid is a mountain or the like, beasts such as deer will trample the place to eat the grown vegetation, causing further damage or damaging the ground of the place. There is a risk. There is a concern that such animal damage may cause erosion and landslides due to rainwater or the like at the laying site.
In this configuration, since the weed-proof sheet constituting the base mat can suppress the growth of vegetation under the laying place, it is possible to prevent the damage caused by the vegetation and prevent the invasion of the beasts that eat the vegetation. This makes it possible to suppress damage caused by the beast as much as possible. Therefore, the above-mentioned action and effect of the present invention of suppressing erosion and sediment collapse and guiding water in a desired direction can be stably exerted for a relatively long period of time.

In the protective mat of the present invention, the base mat is formed by laminating a plurality of flexible sheets, and it is proposed that at least one flexible sheet is a weed-proof sheet having a light-shielding property.

Here, as described above, the weed-proof sheet suppresses photosynthesis of plants by blocking light and ultraviolet rays and hinders the growth, and a light-shielding rate (JIS L 1055) of 98% or more is preferable. .. Further, a weed-proof sheet having a light-shielding ratio of 99% or more is preferable.
Further, the base mat may be one in which all the flexible sheets have water absorption, or may be one provided with a soft sheet having water absorption and a soft sheet having no water absorption. That is, it can be said that the base mat having the present configuration is formed by laminating a plurality of flexible sheets including a flexible sheet having water absorption.

In such a configuration, since the weed-proof sheet constituting the base mat can prevent the growth of vegetation at the place where it is laid, the damage caused by the vegetation can be prevented and the vegetation can be eaten as in the above configuration. It is possible to suppress damage caused by the invasion of beasts as much as possible. As a result, it is possible to prevent erosion and sediment collapse due to rainwater or the like that permeates the ground from the damaged portion, suppress erosion and sediment collapse for a relatively long period of time, and guide water in a desired direction. The action and effect can be stably exerted.

In the protective mat of the present invention, the base mat is formed by stacking and suturing a plurality of flexible sheets, and at least one of the flexible sheets is a weed-proof sheet having a light-shielding property. It is proposed that the upper mat superposed on the upper surface is sewn to the base mat so that the seams of the flexible sheet do not overlap with each other.

Here, as described above, the weed-proof sheet suppresses photosynthesis of plants by blocking light and ultraviolet rays and hinders the growth, and a light-shielding rate (JIS L 1055) of 98% or more is preferable. .. Further, a weed-proof sheet having a light-shielding ratio of 99% or more is preferable.
Further, the base mat may be one in which all the flexible sheets have water absorption, or may be one provided with a soft sheet having water absorption and a soft sheet having no water absorption.

According to such a configuration, the growth of vegetation at the place where the vegetation is laid can be prevented. Can be suppressed. As a result, the above-mentioned action and effect of the present invention, which suppresses erosion and sediment collapse and guides water in a desired direction, can be stably exerted for a relatively long period of time.
Further, in this configuration, since the seam in which a plurality of flexible sheets constituting the base mat are sewn and the seam in which the upper mat is sewn on the base mat do not overlap, damage occurs from the seam. It can be suppressed from being lost. Further, since the above-mentioned seams do not overlap each other, each seam can be made as small as possible, and it is possible to prevent the seam from reducing the light-shielding property of the weed-proof sheet as much as possible. As a result, it is possible to suppress the growth of vegetation from the seams of the weed-proof sheet, and the action and effect of this configuration of preventing or suppressing the above-mentioned damage can be appropriately exerted.

In the protective mat of the present invention, it is proposed that the base mat includes a flexible sheet made of a non-woven fabric made of polyester fiber.

Since the non-woven fabric having such a structure is excellent in durability and weather resistance, the protective mat having this structure can also exhibit high durability and weather resistance. Therefore, after laying, the above-mentioned action and effect of the present invention can be stably exhibited for a long period of time. Further, since such a configuration is lightweight, it is possible to reduce the burden required for the transportation when the worker transports it to the laying place in the mountains.

When the base mat is made of one flexible sheet, the flexible sheet is made of a non-woven fabric made of polyester fiber, while the base mat is made of a plurality of flexible sheets. , At least one flexible sheet is made of a non-woven fabric made of polyester fiber. In the latter case, in the configuration in which at least one flexible sheet is a weed-proof sheet, it is preferable that the weed-proof sheet is a non-woven fabric made of polyester fiber. The polyester fibrous nonwoven fabric may be either a long-fiber nonwoven fabric or a short-fiber nonwoven fabric.

The protective mat of the present invention can suppress the infiltration of rainwater into the ground at the place where it is laid, can suppress erosion and landslide as much as possible, and can suppress the vigorous flow of rainwater downward. Therefore, it is possible to suppress erosion and sediment collapse in the lower part. By laying such a protective mat at the construction site of a steel tower constructed on the slope of a mountain, it is possible to suppress the occurrence of erosion and landslides at the construction site and locations below the construction site.

It is a top view of the protection mat 1 of Example 1. FIG. It is a cross-sectional view taken along the line PP in FIG. It is a perspective view of the protective mat 1. It is an exploded perspective view of the protective mat 1. It is explanatory drawing which shows the state in which the protective mat 1 was laid. It is explanatory drawing which shows the water conduction of rainwater by a protective mat 1. It is a vertical sectional view of the protective mat 1 of Example 3. FIG. 3 is a plan view of (A) the protective mat 1 and (B) a plan view of the base mat 2 of the third embodiment. It is a vertical sectional view of the protective mat 1 of Example 4. FIG. It is a top view of the protective mat 101 of another example. It is explanatory drawing which shows the state in which the protective mat 1 of Example 1 and the protective mat 101 of another example are laid.

Examples of the present invention will be described with reference to the accompanying drawings.

FIGS. 1 to 4 show the protective mat 1 of the first embodiment. The protective mat 1 of this embodiment is formed by superimposing and joining the base mat 2 and the upper mat 3, and a plurality of raised portions 4 are formed on the base mat 2 at predetermined intervals w. ing. As will be described later, the protective mat 1 of this embodiment is mainly laid on the slope of a mountain (see FIG. 5), and by suppressing the infiltration of rainwater into the ground, erosion and sediment collapse occur. It can be suppressed.

As shown in FIGS. 1 to 3, the protective mat 1 of the present embodiment has a substantially rectangular shape, and each raised portion 4 is formed along one direction substantially parallel to one side edge thereof. In this embodiment, the vertical direction is defined with the side where the raised portion 4 is provided as the upper side and the opposite side as the lower side with respect to the base mat 2. Further, the longitudinal direction (the one direction) of the raised portion 4 is defined as the front-rear direction.

In this embodiment, the base mat 2 and the upper mat 3 are made of a non-woven fabric obtained by molding polyester filaments by a spunbond manufacturing method. Therefore, both are lightweight, have excellent mechanical strength (tensile strength) and weather resistance, and also have excellent hygroscopicity. Furthermore, it is flexible and easily deformed to imitate the ground surface to be laid. The base mat 2 and the upper mat 3 of the present embodiment are made of the non-woven fabric of the same standard, and the non-woven fabric corresponds to the flexible sheet of the present invention.

As shown in FIG. 4, the base mat 2 and the upper mat 3 are made of the above-mentioned non-woven fabric having a substantially rectangular shape having different sizes from each other. The upper mat 3 is sewn on the upper surface of the base mat 2 in a state where a plurality of ridges 32 which are curved upward in a wavy shape and protruded are formed at predetermined intervals w (see FIG. 2). It is integrated. Each ridge 32 is formed in a long shape in the front-rear direction of the upper mat 3. Such an upper mat 3 is superposed on the base mat 2 so as not to overlap the outer peripheral edge of the base mat 2 with a predetermined width. Then, it is sewn to the base mat 2 so as to go around the outer periphery of the upper mat 3, and both side edges of each ridge portion 32 are also sewn to the base mat 2. As a result, the ridges 32 are sewn together so as to surround them, and the non-contact upper surface portion 22 of the base mat 2 located directly below the ridges 32 creates a sealed gap in the front-rear direction. It is formed in a long shape along the line. Here, the ridge portion 32 and the non-contact upper surface portion 22 constitute the packaging portion 11 according to the present invention (see FIG. 2).

Here, the upper mat 3 is sewn to the base mat 2, and the middle flat portion 33 between the adjacent ridges 32 and the side flat portions 34, 34 outside the ridges 32, 32 located on both sides thereof. And are stacked on the upper surface of the base mat 2. In the base mat 2, the portion overlapping each of the middle flat portions 33 of the upper mat 3 is the middle upper surface portion 23, and the portion overlapping each side flat portion 34 is the side upper surface portion 24. Then, as shown in FIG. 2, the portion of the protective mat 1 that forms a two-layer structure by the middle flat portion 33 and the middle upper surface portion 23 is the road bottom portion 13 of the headrace 6 described later, and the side flat portion. The portion forming a two-layer structure by the 34 and the side upper surface portion 24 is the side bottom portion 14.

Further, as described above, a portion where the upper mat 3 is not overlapped is provided on the outer peripheral edge of the base mat 2 with a predetermined width, and the overlap margin portion 21 of the present invention is formed by the portion. There is. Since the overlapping margin portion 21 is composed of only the base mat 2, it is half of the road bottom portion 13 and the side bottom portion 14 having a two-layer structure of the base mat 2 and the upper mat 3. It becomes the thickness.

On the other hand, as shown in FIG. 2, core materials 9 having substantially the same length as the bag portion 11 are housed and arranged in the voids of each bag portion 11 described above. The core material 9 of this embodiment is made of urethane foam foam formed in the shape of a round bar having a circular cross section (see FIG. 4), and is a flexible sponge member. By disposing the core material 9 in the gap, the bag portion 11 and the core material 9 inside the bag portion 9 and the raised portion 4 protruding above the base mat 2 are formed. Here, since the ridge portion 32 of the bag portion 11 is the above-mentioned non-woven fabric, the core material 9 forms the skeleton of the raised portion 4.

As shown in FIGS. 1 to 3, such a protective mat 1 is provided with a groove-shaped headrace 6 between adjacent raised portions 4. Each headrace 6 is composed of two adjacent raised portions 4, 4 and a road bottom portion 13 between the raised portions 4, 4. As shown in FIG. 2, the width of the headrace 6 of the present embodiment corresponds to the interval w of the above-mentioned raised portions 4, and the depth thereof corresponds to the height t of the raised portions 4. In this embodiment, each raised portion 4 is provided so that its longitudinal direction is substantially parallel to the two opposite sides of the base mat 2, and each headrace 6 is also provided with the two sides. It is provided substantially in parallel.

As will be described later, the protective mat 1 of this embodiment is laid on the slope of a mountain, the momentum of rainwater flowing down along the slope is weakened at each raised portion 4, and the rainwater is further introduced before and after the headrace 6. The water is guided in the direction (see FIGS. 5 and 6). In this embodiment, the height of the raised portion 4 (depth of the headrace 6) t, the distance between the raised portions 4 (width of the headrace 6) w, and the raised portion 4 so that the effect is sufficiently exhibited. Set the number of arrangements per unit area of. Here, the height t of the raised portions 4 greatly contributes to the effect of stopping the momentum of rainwater, the interval w of the raised portions 4 greatly contributes to the water guiding effect of rainwater, and the number of arrangements of the raised portions 4 is the rainwater. It contributes to both the effect of stopping the momentum and the effect of water conduction.

Specifically, the height t of the raised portions 4 is 3 cm to 10 cm, the interval w of the raised portions 4 is 6 cm to 25 cm, and the number of the raised portions 4 is arranged per unit area (per 1 m ² ). It is set to 3 to 8 pieces. More specifically, if the height t of the raised portion 4 is smaller than the above range, the effect of stopping the momentum of rainwater is small, and if it is larger than the above range, the effect of stopping the momentum of rainwater is significantly different. Since it is difficult, it is preferable to set it in the above range in consideration of ease of manufacturing, cost reduction, and the like. Further, when the interval w of the raised portions 4 is wider than the above range, the effect of guiding water is small, and when it is narrower than the above range, the effect of guiding water is reduced and rainwater easily gets over the raised portions 4. Will end up. Therefore, it is preferable to set it in the above range. Further, if the number of the raised portions 4 is smaller than the above range, the width of the headrace 6 becomes relatively wide, so that the effect of guiding water by the headrace 6 is small, but if it is larger than the above range, it is said. Since the width of the headrace 6 is relatively narrow, rainwater can easily get over the raised portion 4, and the effect of guiding water is reduced. Therefore, it is preferable to set it in the above range. The height t, the interval w, and the number of arrangements of the raised portions 4 can be appropriately set according to the slope of the slope to be laid, etc., but by setting within the above range, various slopes can be set. Can exert the above-mentioned action and effect.

The height t, the interval w, and the number of arrangements of the raised portions 4 are set by the relative relationship between the height t and the interval w, in addition to being set by specific numerical values as described above. It is also possible. This is because, as described above, the interval w of the raised portions 4 contributes to both the effect of stopping the momentum of rainwater and the effect of conducting water, and from the interval w, the number of arrangements of the raised portions 4 per unit area. It depends on the fact that is decided. Specifically, it is preferable that the interval w of the raised portions 4 is in the range of 1.5 to 6 times the height t, and further, the interval w is 1.8 times to 2. times the height t. It is preferable that the range is 5 times. By setting the interval w and the height t within such a range, the above-mentioned effects can be sufficiently exhibited.

Next, an embodiment in which the protective mat 1 of the first embodiment described above is laid will be described.
The protective mat 1 of the first embodiment has a substantially square shape with a side length of about 1 m, and has five raised portions 4. The height (depth of the headrace 6) t of the raised portion 4 is about 5 cm, and the distance (width of the headrace 6) w of the raised portions 4 is about 12 cm.

As shown in FIG. 5, a plurality of protective mats 1 are laid on the slope of a mountain at a construction site where a transmission line tower or the like is constructed. As described above, since trees are cut down and the ground surface G is exposed at this construction site, a plurality of protective mats 1 are spread so as to cover the ground surface G. The protective mats 1 are laid side by side so that the headrace 6 (front-back direction of the raised portion 4) is inclined at a predetermined angle with respect to the horizontal direction. Then, the protective mats 1 that are adjacent to each other in the vertical and horizontal directions are laid so that the overlapping margins 21 overlap each other, and cover the ground surface G without a gap. Then, each protective mat 1 is fixed to the slope by placing a predetermined iron pin (not shown) on the overlapping margin portion 21 in which the adjacent protective mats 1 are overlapped with each other. The base mat 2 of this embodiment is made of a non-woven fabric flexible sheet, and since the sheet surface is relatively rough, it is not slippery on the ground surface G and can be easily placed at a desired position.

Here, since the protective mat 1 is composed of a base mat 2 and an upper mat 3 made of a flexible non-woven fabric as described above, and a core material 9 made of a flexible urethane foam, a slope. It can be laid so as to follow the shape of. Further, as described above, the overlapping margins 21 of the adjacent protective mats 1 are substantially half the thickness of the side bottom portion 14, so that by overlapping, the thickness is substantially the same as that of the side bottom portion 14. Will be. Therefore, in the protective mats 1 arranged in the front-rear direction, the bottom surfaces of the headraces 6 and 6 continuous in the front-rear direction are smoothly connected. As a result, rainwater easily flows along the continuous headrace 6. Similarly, in the protective mats 1 and 1 arranged in parallel with the headrace 6, one headrace 6'can be formed by the side bottom portions 14 and 14 and the overlapping margin portion 21 overlapping between them, and the headrace 6'can be formed. 'Also has substantially the same depth as the headrace 6 of each protective mat 1, and the bottom surface of the headrace 6'is also formed relatively smoothly. Therefore, even in such a headrace 6', the same water-conducting effect as that of the headrace 6 of the protective mat 1 can be produced.

Further, the angle at which the headrace 6 of the protective mat 1 is tilted is appropriately determined according to the direction in which the headrace 6 is to be guided. That is, the angle is set so that erosion or sediment collapse does not occur or is unlikely to occur at the destination of the rainwater flowing through the headrace 6. Further, if this angle is a steep angle, the headrace 6 approaches the slope of the slope, and the momentum of rainwater flowing through the headrace 6 becomes stronger. Therefore, it is preferable to set the angle close to the horizontal direction. Specifically, it is preferable to set the angle in the range of 5 degrees to 30 degrees toward a place where the occurrence of erosion or the like can be suppressed.

When it rains with a plurality of protective mats 1 laid in this way, as shown in FIG. 6, rainwater flowing downward along the slope is lined up at intervals on each of the protective mats 1. It is possible to gradually weaken the momentum of colliding with 4 and trying to flow downward of rainwater. Then, a part of the rainwater that has collided with the raised portion 4 cannot get over the raised portion 4 and flows along the headrace 6. As a result, it is possible to prevent rainwater from flowing vigorously along the slope below the place where the protective mat 1 is laid (the construction place), and the rainwater flowing below causes erosion and sediment collapse. It can be suppressed as much as possible. Further, since rainwater can flow along the headrace 6 of the protective mat 1, the amount of rainwater flowing below the construction site along the slope can be reduced, so that the rainwater flowing below the construction site can be used. The above-mentioned effect of suppressing the occurrence of erosion and landslides is further improved. In particular, in the case of heavy rain, the amount of water flowing along the slope may increase significantly, and although there is a limit to stopping the momentum of the flow only by the raised portion 4, the rainwater is guided by the headrace 6 to guide the rainwater. Even if the amount of precipitation is large, the effect of suppressing the occurrence of erosion or the like due to the rainwater flowing downward can be sufficiently and stably exhibited. Further, by directing the direction of the headrace 6 (front-back direction) to a place where the occurrence of erosion or the like can be suppressed as described above, rainwater can be guided to the place, so that the effect of suppressing the occurrence of the above-mentioned erosion or the like can be obtained. Further improve. In this embodiment, since the height t, the interval w, and the number of arrangements per unit area of the raised portions 4 are set as described above, the effect of suppressing the momentum of the rainwater described above is obtained. , The effect of flowing the rainwater along the headrace 6 can be surely and stably exhibited.

Further, since the protective mat 1 is composed of a base mat 2 and an upper mat 3 from a non-woven fabric, rainwater can be sucked in, so that the rainwater can be suppressed from seeping into the ground at the place where it is laid. Since the weight increases due to the sucked rainwater, it is possible to prevent the rainwater flowing on the slope from moving from the laid position due to the rainwater flowing on the slope at the time of rainfall, and the weight can be stably held at the position. Further, since the flexible sheet constituting the base mat 2 has a relatively rough surface as described above, it does not slip easily even when it rains, so that it can be held more stably.

As described above, according to the protective mat 1 of the first embodiment, by laying it on a slope of a mountain or the like, it is possible to prevent rainwater flowing along the slope from seeping into the ground, and the place where it is laid (the construction place). It is possible to prevent erosion and sediment collapse. Further, since it is possible to suppress the vigorous flow of rainwater below the laying place of the protective mat 1, it is possible to prevent erosion and sediment collapse due to the rainwater flowing from the laying place below the laying place. .. Since rainwater can flow along the headrace 6, by arranging the headrace 6 toward a place where erosion due to rainwater is unlikely to occur, the effect of suppressing erosion and sediment collapse is achieved. Is more stable. When the protective mat 1 of the present embodiment is laid in this way, not only can erosion or the like be suppressed at the laid place, but also erosion or the like caused by the laying of the protective mat 1 can be suppressed below the laying place. can. Therefore, by laying it at the construction site of the steel tower of the transmission line described above, it is possible to suppress the occurrence of erosion and landslide at the foot of the tower and the place below the foot. Such an action effect can be sufficiently exerted even when there is a large amount of rainfall such as heavy rainfall.

Further, since the protective mat 1 is made of a non-woven fabric made of polyester filament and urethane foam, it is excellent in water resistance, weather resistance, corrosion resistance, heat resistance and the like. Therefore, after laying, the above-mentioned action and effect of the present invention can be maintained for a long period of time. Further, since the period that does not require maintenance or replacement can be set to be relatively long, the cost required for these can be significantly reduced.

Further, since the protective mat 1 of the first embodiment is made of a non-woven fabric and urethane foam as described above, it is extremely lightweight. Therefore, it is possible to reduce the burden on the worker even in a place where the worker has to carry it, such as in the mountains where the steel tower of the transmission line is constructed. Further, the laying work can be performed relatively easily.

In the protective mat 1 of the second embodiment, the base mat 2 is composed of only a weed-proof sheet having a light-shielding property. The weed-proof sheet constituting the base mat 2 is made of a short-fiber non-woven fabric made of polyester short fibers, and has excellent mechanical strength (tensile strength) and weather resistance in addition to high light-shielding properties. Furthermore, it is lightweight and flexible, and has excellent hygroscopicity. The protective mat 1 provided with such a base mat 2 is easily deformed so as to imitate the ground surface of the place where it is laid, as in the above-described first embodiment.

Here, in the second embodiment, the weed-proof sheet constituting the base mat 2 is a relatively thick felt-like material made of the above-mentioned short fiber non-woven fabric, and has a light-shielding rate (JIS L 1055) of 99% or more. belongs to. Since the base mat 2 is a weed-proof sheet having a high light-shielding property, it is possible to block light and ultraviolet rays at the place where the protective mat 1 of the present embodiment is laid, and it is possible to suppress photosynthesis of plants. The base mat 2 of the second embodiment has a higher density than the base mat (nonwoven fabric) 2 of the first embodiment described above, but is a short fiber non-woven fabric. It also has water absorption. It also has water permeability that allows water to pass through the portion that cannot absorb water.

Since the base mat 2 is the same as the above-mentioned Example 1 except that the base mat 2 is made of the above-mentioned weed-proof sheet, the same reference numerals are given to the same components and the description thereof will be described. Omitted as appropriate.

The protective mat 1 of the second embodiment can be laid in the same manner as the first embodiment described above (see FIG. 5). Specifically, multiple laying will be done on the slope of the mountain at the construction site where the steel tower of the transmission line was constructed. Here, the plurality of protective mats 1 are laid side by side so that the headrace 6 is inclined at a predetermined angle with respect to the horizontal direction, and covers the ground surface G of the construction site without gaps. Since the base mat 2 has flexibility, the protective mat 1 of the second embodiment can be laid so as to follow the shape of the slope in the same manner as the first embodiment described above. Further, since the base mat 2 of the protective mat 1 is made of a felt-shaped weed-proof sheet, it does not easily shift when laid on the ground and can be easily placed at a desired position. Furthermore, even if the ground becomes slippery during rainfall, it can be relatively stably held at the laid position.

When it rains with the protective mat 1 of the second embodiment laid in this way, the momentum of the rainwater flowing downward along the slope can be gradually weakened and the headrace canal, as in the first embodiment described above. It can be flowed along 6. Therefore, it is possible to prevent rainwater from flowing vigorously along the slope to the lower part of the construction site, and it is possible to prevent erosion and sediment collapse due to the rainwater flowing downward. Further, by directing the direction of the headrace 6 (front-back direction) to a place where the occurrence of erosion or the like can be suppressed, rainwater can be guided to the place, so that the effect of suppressing the occurrence of the above-mentioned erosion or the like is further improved. As described above, even in the configuration of the second embodiment, the same effects as those of the first embodiment can be obtained.

Further, in the configuration of the second embodiment, since the base mat 2 is a weed-proof sheet, it is possible to prevent the growth of vegetation on the ground covered by the base mat 2, and the growing vegetation damages the protective mat 1. It can be suppressed as much as possible.
More specifically, in the protective mat 1, since the upper mat 3 and the base mat 2 are non-woven fabrics, rainwater soaks into the ground to some extent when it rains, and rainwater soaks from above the place where it is laid. Therefore, when light or ultraviolet rays reach the ground covered with the protective mat 1, photosynthesis can be performed, so that vegetation may grow and the protective mat 1 may be damaged. If it is damaged, more rainwater will easily seep into the ground than the damaged part, and there is a possibility that the laid place will be eroded. Further, when vegetation grows on the protective mat, a beast such as a deer enters to eat the vegetation, and the beast tramples the protective mat 1 and further damages the protective mat 1. As it grows larger, the ground at the place where it was laid (the construction place) is damaged. When the damage of the protective mat 1 becomes large, the plants and trees grow more easily, so that the tendency of deer and the like to enter becomes stronger. This causes a problem that the replacement cycle of the protective mat is shortened and the cost and labor of the replacement are increased. Furthermore, if the ground is damaged as described above, there is a concern that erosion and landslides are likely to occur due to rainwater.
In response to this problem, the protective mat 1 of the second embodiment can block light and ultraviolet rays because the base mat 2 is made of a weed-proof sheet having a light transmittance of 99% or more, and the protection is concerned. It is possible to suppress the growth of vegetation on the ground covered with the mat 1. Thereby, it is possible to prevent the vegetation from damaging the protective mat 1 and also to prevent the vegetation from growing on the protective mat. Therefore, it is possible to prevent a beast such as a deer from entering the protective mat 1, and it is possible to suppress the occurrence of damage or the like caused by the beast as much as possible.
Since the protective mat 1 is fixed to the slope by superimposing the overlapping margins 21 of those adjacent to each other in the vertical and horizontal directions and driving a predetermined iron pin, the protective mat 1 is fixed to the portion where the base mat 2 is overlapped. An iron pin is driven. As a result, the reduction in light-shielding property due to the placement of iron pins (means for fixing to the ground) can be suppressed as much as possible by making the base mat 2 double, so that the desired weed-proof effect is stably exhibited. can.

As described above, in the configuration of the second embodiment, since the base mat 2 is a weed-proof sheet, it is possible to suppress the growth of vegetation at the place where it is laid (construction site), and the damage caused by the growth of the vegetation and the vegetation are eaten. It is possible to prevent damage caused by beasts. Therefore, erosion and sediment collapse due to the occurrence of breakage can be suppressed, and the effect of guiding water in a desired direction through the headrace 6 can be stably exhibited. Therefore, according to the protective mat 1 of the second embodiment, in addition to being able to exert the same action and effect as those of the above-mentioned example 1, the action and effect can be stably maintained for a relatively long period of time.

As shown in FIG. 7, the protective mat 1 of the third embodiment has a two-layer structure in which the base mat 2 has a light-shielding weed-proof sheet 2a and a soft sheet 2b different from the weed-proof sheet 2a. It will be. The base mat 2 of the third embodiment is formed by superimposing the same rectangular weed-proof sheet 2a as the flexible sheet 2b on the lower surface of the rectangular flexible sheet 2b. The flexible sheet 2b is made of the same polyester long fiber non-woven fabric as in Example 1 described above, and the weed control sheet 2a is made of the same polyester short fiber short fiber nonwoven fabric as in Example 2 described above. That is, the weed-proof sheet 2a has a high light-shielding property having a light-shielding rate (JIS L 1055) of 99% or more. On the other hand, the soft sheet 2b has a light-shielding ratio of less than 95%, and has a lower light-shielding property than the weed-proof sheet 2a. Therefore, the flexible sheet 2b alone cannot sufficiently block light and ultraviolet rays, and it is difficult to suppress the growth of plants. The other functions of the light-shielding property will be omitted because they are described in Examples 1 and 2 described above.

The base mat 2 of the third embodiment is integrated by superimposing the weed-proof sheet 2a on the lower surface of the flexible sheet 2b and suturing the two. Here, the flexible sheet 2b and the weed-proof sheet 2a are sewn along the outer peripheral edge, and as shown in FIG. 8B, the seam 41 is formed in a rectangular shape at the outer peripheral end portion. The protective mat 1 of the present Example 3 is formed by suturing the upper mat 3 on the upper surface of the base mat 2 thus formed in the same manner as in the above-mentioned Example 1 (see FIG. 3). Here, the upper mat 3 is overlapped and sewn on the base mat 2 so as not to overlap the outer peripheral edge of the base mat 2 by a predetermined width. Therefore, as shown in FIG. 8A, the seam 42 in which the upper mat 3 and the base mat 2 are sewn together does not overlap with the seam 41 between the flexible sheet 2b and the weed-proof sheet 2a described above. As a matter of course, the core material 9 is housed in each bag portion 11 composed of the ridges 32 of the upper mat 3 and the non-contact upper surface portions 22 of the base mat 2 (see FIG. 4). ..

As described above, in the configuration of the third embodiment, the base mat 2 has a structure in which the weed-proof sheet 2a and the flexible sheet 2b are overlapped with each other, and further, the seam 41 between the weed-proof sheet 2a and the flexible sheet 2b is the base. It is designed so as not to overlap the seam 42 between the mat 2 and the upper mat 3. Since the components other than these configurations are the same as those in the first embodiment described above, the same components are designated by the same reference numerals, and the details thereof are omitted as appropriate.

The protective mat 1 of the third embodiment can be laid in the same manner as the first and second embodiments described above (see FIG. 5). Here, since the lower surface of the base mat 2 that comes into contact with the ground surface G of the protective mat 1 is formed of a felt-shaped weed-proof sheet 2a, it is difficult for the protective mat 1 to shift when laid, as in the second embodiment. It is easy to place it in a desired position, and it can be relatively stably held in the laying position even when it rains. Then, when it rains in the state of being laid as described above, the momentum of the rainwater flowing along the slope can be weakened and the rainwater can flow in a desired direction along the headrace 6 as in the above-described first embodiment. Therefore, it is possible to suppress erosion and landslides below the laid site (the construction site) as much as possible. As described above, even with the configuration of the third embodiment, the same effects as those of the first embodiment can be obtained.
Further, in the configuration of the third embodiment, since the base mat 2 is provided with the weed-proof sheet 2a, it is possible to prevent the growth of vegetation at the place where the base mat 2 is laid, as in the second embodiment described above. As a result, damage to the protective mat 1 due to the growth of vegetation can be prevented, and damage to the protective mat 1 due to the beast that eats the grown vegetation can be suppressed as much as possible.

Further, in the configuration of the third embodiment, the seam 41 in which the weed-proof sheet 2a and the flexible sheet 2b constituting the base mat 2 are sewn together does not overlap with the seam 42 between the base mat 2 and the upper mat 3. Therefore, damage from these seams 41 and 42 can be suppressed as much as possible. Further, it is possible to prevent the seams from becoming large due to the overlapping of the plurality of seams, and to make the seams 41, 42 generated on the base mat 2 as small as possible. The intrusion of ultraviolet rays can be suppressed, and the reduction of the light-shielding property of the weed-proof sheet 2a due to the seams 41 and 42 can be suppressed as much as possible. In addition, in this configuration, since the flexible sheet 2b is superposed on the weed-proof sheet 2a, the seams 41 and 42 of the weed-proof sheet 2a are covered by the flexible sheet 2b, so that the weed-proof sheet is covered. It can contribute to the effect of suppressing the reduction of the light blocking effect of 2a. Further, since the seam 41 of the base mat 2 is located on the overlapping margin portion 21, the adjacent overlapping margin portions 21 overlap each other and the weed-proof sheet 2a is doubled in the laid state, and each weed-proof sheet 2a is formed. The ingress of light and ultraviolet rays from the seam 41 can be further suppressed. On the other hand, in the seam 42, since the upper mat 3 overlaps the base mat 2, the ingress of light and ultraviolet rays is suppressed. Therefore, according to the configuration of the third embodiment, the reduction of the light-shielding property of the weed-proof sheet 2a by the seam 41 of the base mat 2 can be suppressed as much as possible, so that the growth of plants from the seam 41 can be suppressed. , The action effect of preventing the above-mentioned protective mat 1 from being damaged can be appropriately exerted.
Even in the third embodiment, similarly to the second embodiment described above, a predetermined iron pin is placed on the stacking allowance portion 21 to fix the iron pin on the slope, and the light-shielding property due to the placement is achieved. The reduction can be suppressed.

As described above, in the configuration of the third embodiment, the growth of vegetation at the laid place (construction place) can be suppressed, and the damage caused by the vegetation and the damage caused by the beast can be prevented. The effect of suppressing collapse and guiding water in a desired direction by the headrace 6 is stably exhibited. Therefore, according to the protective mat 1 of the third embodiment, the same effects as those of the above-mentioned Examples 1 and 2 can be exhibited.

As shown in FIG. 9, the protective mat 1 of the fourth embodiment has a two-layer structure in which a light-shielding weed-proof sheet 2a is superposed on the upper surface of a flexible sheet 2b different from the weed-proof sheet 2a. , The flexible sheet 2b and the weed-proof sheet 2a form the same rectangular shape. Here, the weed-proof sheet 2a of the present embodiment is made of a high-density long-fiber non-woven fabric made of polyester long fibers, is thinner than the weed-proof sheets of Examples 2 and 3 described above, and has a comparative surface. Smooth. Although the form of the weed-proof sheet 2a is different from that of Examples 2 and 3, the light-shielding rate (JIS L 1055) is 99% or more and has a high light-shielding property. Therefore, by laying the protective mat 1 of the present embodiment, it is possible to block light and ultraviolet rays and prevent the growth of vegetation, as in the second and third embodiments. Further, the flexible sheet 2b is the same as that of Example 3 described above.
The weed-proof sheet 2a of the present embodiment is lightweight and flexible, has excellent mechanical strength and weather resistance, but has lower water absorption than the weed-proof sheets of Examples 2 and 3. .. Further, since it has water permeability, in the base mat 2 of the present embodiment, rainwater that has permeated the weed-proof sheet 2a can be absorbed by the soft sheet 2b.

As described above, the base mat 2 of the fourth embodiment is formed by superimposing the weed-proof sheet 2a on the upper surface of the flexible sheet 2b. More specifically, since the weed-proof sheet 2a has a relatively smooth surface, when it is arranged on the lower surface of the flexible sheet 2b as in Example 3, it is slippery and difficult to arrange when laid on the ground. Furthermore, if the ground becomes slippery during rainfall, there is a risk that it will shift from the laid position. For these reasons, the base mat 2 of the present embodiment is easy to lay at a desired position by arranging a soft sheet 2b having a relatively rough sheet surface on the lower side, and is stable at the laying position even when it rains. Can be retained.

Further, even in the configuration of this embodiment, the flexible sheet 2b and the weed-proof sheet 2a are sewn along the outer peripheral edge as in the above-mentioned Example 3, and the seams 41 form the base mat 2 and the upper mat. It is designed so that it does not overlap with the seam 42 to which 3 is sewn (see FIG. 8).

As described above, the configuration of the fourth embodiment is provided with the base mat 2 in which the weed-proof sheet 2a made of the high-density long-fiber non-woven fabric is superposed on the upper surface of the flexible sheet 2b, and other than this, the same as the above-mentioned Example 3 Since they are the same, the same reference numerals are given to the same components, and the details are omitted as appropriate.

The protective mat 1 of the fourth embodiment can be laid in the same manner as in the first to third embodiments described above (see FIG. 5). Since the base mat 2 has a structure in which the flexible sheet 2b and the weed-proof sheet 2a are overlapped with each other, the protective mat 1 has vegetation at the laid place (the construction place) as in the above-mentioned Example 3. Since growth can be suppressed and damage caused by plants and animals can be prevented, erosion and sediment collapse due to the damage can be suppressed, and the effect of guiding water in a desired direction by the headrace 6 is stably exhibited. Therefore, even in the configuration of the present Example 4, the same action and effect as those of the above-mentioned Examples 2 and 3 can be obtained.

The present invention is not limited to the above-mentioned Examples 1 to 4, and configurations other than the above-mentioned Examples can be appropriately modified and carried out within the scope of the gist of the present invention.
In the above-mentioned Examples 1 to 4, the protective mat 1 is laid so that the headrace 6 is in the range of 5 to 30 degrees with respect to the horizontal direction, but the angle is not necessarily limited to this, and the headrace is not necessarily limited to this. The angle can be appropriately set so that rainwater can flow in a desired direction according to 6. For example, it may be 45 degrees or 60 degrees with respect to the horizontal direction. Further, the raised portion 4 can be arranged along a substantially horizontal direction so as to maximize the effect of weakening the momentum of rainwater flowing along the slope.

Further, in the above-described configurations of Examples 1 to 4, each raised portion 4 and the headrace 6 are provided substantially parallel to the two opposite sides of the base mat 2, but the present invention is not limited to this. It may be tilted at a predetermined angle with respect to two sides. For example, as in the protective mat 101 of another example shown in FIG. 10, each raised portion 104 is provided at an angle θ inclined by 10 to 15 degrees with respect to the two opposite sides of the base mat 2. You can also. In this configuration, each headrace 106 is also provided at an angle θ inclined by 10 to 15 degrees with respect to the two sides, similarly to the raised portion 104. Such an alternative configuration is composed of an upper mat 103 forming each raised portion 104 and a headrace 106. The base mat 2 has the same configuration as that of any one of Examples 1 to 4, and the upper mat 103 is made of the same non-woven fabric made of polyester filament as that of Example 1. By arranging the protective mat 101 of another example in parallel on the slope of the mountain, it is possible to form a headrace that is inclined at a predetermined angle θ with respect to the slope. Further, as shown in FIG. 11, the protective mat 1 of Example 1 and the protective mat 101 of another example can be laid respectively. By using the protective mats 1, 101 provided with the headraces 6 and 106 having different angles in this way, it is easy to form the headrace 106 that guides water in a desired direction according to the shape of the slope, and the headrace 106 is stable. And water can be conducted. Further, by using these protective mats 1, 101, it is easy to lay them vertically and horizontally on slopes of various shapes, and there is an advantage that the workability of the laying work is improved. As a matter of course, it is also possible to lay the protective mat 1 of Examples 2 to 4 and the protective mat 101 of another example, respectively (see FIG. 11).

Further, in Examples 3 and 4 described above, the base mat 2 has a two-layer structure in which the flexible sheet 2b and the weed-proof sheet 2a are overlapped, but the base mat 2 is not limited to this and has a three-layer structure or a five-layer structure. It may have a multi-layer structure such as. The base mat having a multi-layer structure having three or more layers may be provided with at least one weed-proof sheet 2a, and may be configured to include a plurality of weed-proof sheets 2a. In the configuration including a plurality of weed-proof sheets 2a, the same type of weed-proof sheets 2a may be provided, or different types of weed-proof sheets 2a may be provided. Similarly, in the configuration including a plurality of flexible sheets 2b, the configuration may include the same type of flexible sheets 2b, or the configuration may include different types of flexible sheets 2b.

1,101 Protective mat 2 Base mat 2a Flexible sheet 2b Weed-proof sheet 3,103 Upper mat 4,104 Raised part 9 Core material 11 Packaging bag part 21 Laminating margin part 32 Ridge part 41, 42 Seams

Claims (7)

A protective mat laid to cover the ground surface,
A base mat made of a hygroscopic soft sheet,
A plurality of elongated ridges are arranged side by side on the upper surface of the base mat at predetermined intervals, and a long ridge projecting from the upper surface of the base mat.
It is provided between adjacent ridges and is provided with a plurality of headraces capable of conducting water along the longitudinal direction of the ridges.
The raised part
A long bag made of a hygroscopic soft sheet and having a closed air gap inside,
A protective mat characterized by being composed of a long flexible core material disposed in the voids of the bag portion. An upper mat made of a hygroscopic soft sheet is laminated and joined to the upper surface of the base mat.
A claim characterized in that a bag portion of each raised portion is formed by a plurality of ridges protruding upward on the upper mat at predetermined intervals and an upper surface of the base mat. Item 1. The protective mat according to item 1. The protective mat according to claim 2, wherein the outer peripheral edge of the base mat is provided with a stacking allowance portion in which the upper mat is not superposed. The protective mat according to any one of claims 1 to 3, wherein the flexible sheet of the base mat is a weed-proof sheet having a light-shielding property. The base mat is formed by laminating a plurality of flexible sheets, and any one of claims 1 to 3 is characterized in that at least one flexible sheet is a weed-proof sheet having a light-shielding property. Protective mat as described in. The base mat is formed by stacking and stitching a plurality of flexible sheets, and at least one flexible sheet is a weed-proof sheet having a light-shielding property.
2. The protective mat according to 3. The protective mat according to any one of claims 1 to 6, wherein the base mat includes a flexible sheet made of a non-woven fabric made of polyester fiber.

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