JP2020076246A - Bag of sandbag for embankment reinforcement - Google Patents

Abstract

To provide a bag for a sandbag used in a construction method performing protection of a sloped face of an embankment and repair of a collapsed portion of a sloped face in a medium mountainous area by stacking sandbags.SOLUTION: A lower end side of a vertically long rectangular sheet is folded to a front side, a lower end portion of the folded sheet is folded into an upwardly protruding mountain shape and pushed in between both a front side sheet and a rear side sheet, to provide a part where four sheets are folded and overlapped at the lower end portion of the sheet. In that state, left and right overlapped portions of the sheet are stitched, to make a bag shape having an opening at an upper end portion of the front side. A vertical length of the rear side sheet is made to be a length upwardly protruding by a length one to three times as long as a vertical dimension of the front side sheet from the upper end portion of the front side. The rear side sheet upwardly protruding from the bag shape portion is produced through steps of: providing cuts in an upper edge portion in height of the bag shape portion from the left and the right; folding left and right portions above the cuts in an overlapping manner toward a center in a sheet lateral width of the rear side sheet; and stitching overlapping portions.SELECTED DRAWING: Figure 1

Description

  The present invention is a sandbag for embankment reinforcement that is installed on the embankment slope to reinforce the embankment when heaping up earth and sand to build a bank higher than the surroundings when a flat surface is needed for river dikes, housing development, road maintenance, etc. Regarding sandbags.

   A flat surface may be required for river dikes, residential development, road development, railway construction, etc. In such a case, the embankment is formed by raising the earth and sand and making it higher than the surrounding area. In addition, a slope is formed by embankment when restoring a collapsed slope. The slope, which is the side surface of the embankment, is susceptible to weathering and erosion, and in soft ground, the entire embankment may be embedded, so slope protection and reinforcement of the embankment are required. When the slope slope is steep, a method called a reinforced soil wall construction method is used to stabilize the steep slope by laying a surface reinforcement on the entire surface and installing wall materials such as concrete blocks and sandbags.

  On the other hand, when the slope is relatively gentle, a method called the reinforced embankment method is adopted. There are various methods for this reinforced embankment method. In many cases, a method of laying a geotextile in the embankment and increasing the soil strength by pulling resistance of the geotextile, frictional force between the soil and the reinforcing material, interlocking, and promoting consolidation of the embankment to stabilize the entire embankment is adopted. It For example, in Patent Document 1, there is a reinforced embankment construction method in which a plurality of geotextiles are laid in a plurality of steps in the embankment, and a soil wall material arranged on one end side of each geotextile is wound by the geotextile to provide a reinforced soil wall. Has been introduced. In this document, as the soil wall material, stable treated soil in which a shaping agent is mixed with cohesive soil to facilitate shaping at the initial stage of mixing is adopted.

  However, this method requires the work of providing a reinforced soil wall by rolling up the soil wall material arranged on one end side of each geotextile with the geotextile. The work is very troublesome on-site work and has a problem.

JP, 9-279580, A

  The present invention has been made in order to solve these problems of the prior art. The problems are to protect the slope of the embankment and to repair the slope collapse of the middle mountainous area by stacking sandbags. To provide sandbags.

  The invention according to claim 1 for solving the above-mentioned problems is a sandbag bag used for a sandbag for embankment reinforcement to be installed on a slope portion of an embankment, and the sandbag bag is a sheet in which a lower end side of a rectangular sheet long in the vertical direction is a sheet. Fold back to the front side, fold the bottom end of the folded back sheet into a convex chevron, and press between the front and back side sheets to provide a folded portion of the four sheets at the bottom end of the sheet. A state in which the overlapping parts of the left and right ends of the seat are sewn together to form a bag having an opening at the upper end on the front side, and the rear seat projects upward from the upper end on the front by 1 to 3 times the vertical dimension of the front seat. It is a sandbag bag for embankment reinforcement sandbags, wherein the vertical dimension of the unfolded rectangular sheet is adjusted so that

  When the sandbag bag having such a structure is used to reinforce the embankment, the sandbag bag 1 filled with soil is laid on the embankment construction ground 10 with the bottom surface of the sandbag bag 1 facing the slope. The rear-side sheet projecting portion 1a projecting from the rear surface side of the bag-shaped portion 2 is installed in a state of being horizontally spread inward of the embankment. Next, soil is piled up on the back-side sheet projecting portion 1a and on the ground 10 not covered by the projecting portion 1a at a height substantially equal to the thickness of the bag-shaped portion 2. Then, a second sandbag 1 filled with soil is laid on them. The bottom surface of the second sandbag 1 is set at a position slightly displaced from the bottom surface of the first sandbag 1 in consideration of the angle of the slope to be completed. The rear side sheet protruding portion 1a of the second sandbag 1 is placed in a state of being horizontally expanded inward of the embankment as in the first step, and is placed on the rear side sheet protruding portion 1a as in the first step, and Soil is laid on the first-step soil not covered by the protruding portion 1a. By repeating this operation, it is possible to construct an embankment slope in which a plurality of sandbag bags 1 are stacked. In the embankment constructed in this way, even if the sandbag forming the slope is subjected to the earth pressure toward the outside of the slope, the back-side sheet protrusion 1a extends inside the embankment and is sandwiched between the upper and lower soils. Since it has a strong resistance against pulling out. Therefore, it is possible to construct an embankment slope strong against earth pressure. Further, the construction method using such sandbags has an advantage that the construction work of the soil wall is easier than the construction method of laying the geotextile planar reinforcing material on the entire surface.

  According to a second aspect of the present invention, in the sandbag bag according to the first aspect, the bag-shaped portion is folded back so that an inner surface of the bag-shaped surface is an outer surface, and is folded in a mountain shape between the front side sheet and the back side sheet. The sandbag bag for embankment reinforcement is characterized in that the portion that has been pushed in is pushed out to form a flat bottom surface of the bag portion.

  The sandbag having such a configuration has a good appearance and has the same effect as the sandbag according to the first aspect.

  The invention according to claim 3 is the sandbag according to claim 1 or 2, wherein a backside sheet portion of the backside portion of the bag-shaped portion and a backside sheet portion of a portion protruding above the baglike portion are provided. In the boundary part of the sheet, a notch having a length equal to the height of the chevron portion of the portion that was folded and pushed in a chevron shape is provided between the front and back sheets from the left and right ends toward the center of the seat width. This is a sandbag bag for embankment reinforcement sandbags.

  With this configuration, when the sandbag that is filled with soil and inflated is laid horizontally, the entire rear sheet that projects on the backside of the sandbag comes into horizontal contact with the ground. ..

  According to a fourth aspect of the present invention, in the sandbag bag according to the third aspect, the upper portions of the left and right cuts in the back sheet that project upward from the bag-shaped portion are directed toward the center of the lateral width of the back sheet. It is a sandbag bag for embankment reinforcement, which is characterized in that it is folded and folded, and the overlapped edges are sewn together.

  The sandbag bag having such a structure has the same effect as the sandbag bag according to the first aspect.

  According to a fifth aspect of the present invention, in the sandbag bag for embankment reinforcement sandbags according to any one of the first to fourth aspects, the sandbag bag is formed of a sheet woven using a basalt fiber thread. Is a sandbag bag for embankment reinforcement.

 Basalt fiber is a natural material made of 100% basalt, which is a type of volcanic rock, so it has high weather resistance, very little deterioration, is lightweight, non-combustible, and has excellent tension and elasticity, as well as excellent water resistance, acid resistance, and alkali resistance. ing. Therefore, it is the most suitable material for the sandbag that contacts the soil.

FIG. 3 is an external perspective view of the sandbag bag 1. It is a rectangular sheet 4 which is a material of the sandbag bag 1. It is a right side view in the state where the rectangular sheet 4 was folded. The outer side of the sewing line of the bag-shaped portion 2 is the sandbag bag 1 in a state where it appears on the outer surface of the sandbag bag. It is the sandbag bag 1 in which the bag-shaped portion 2 of the sandbag bag 1 in the state of FIG. 4 is turned upside down. FIG. 6 is a front view of the sandbag bag 1 in which the broken line 9 portion in FIG. 5 is flattened, and the portion surrounded by the broken line 7 and the broken line 8 is in a planar state to have a bag bottom surface. FIG. 7 is a right side view of the sandbag bag 1 in the state of FIG. 6. It is a perspective view of the sandbag bag 1 which also showed the hide-and-seek line. It is explanatory drawing of the embankment construction method which uses the sandbag 1 for reinforcement. This is a sandbag bag 20 in which the left and right upper back portions of the sandbag bag 1 are not folded. It is a top view of a state where a plurality of sandbags 20 are horizontally arranged and installed.

  Hereinafter, an embodiment of a sandbag bag 1 for a sandbag for embankment reinforcement according to the present invention will be described with reference to the drawings. FIG. 1 is an external perspective view of the sandbag 1. The sandbag 1 is composed of a bag-shaped portion 2 for containing sand and sand, and a backside sheet 3 having a portion on the backside of the bag-shaped portion 2 and protruding upward. A major feature is that the back-side sheet 3 largely projects upward from the back side of the bag-shaped portion 2. At the time of use, the bag-shaped portion 2 and the backside sheet 3 are placed in a horizontally lying state as described later. Hereinafter, the structure will be clarified in the process of explaining the method of manufacturing the sandbag 1.

  The sandbag 1 is manufactured by folding and stitching a rectangular sheet. FIG. 2 shows the shape of the rectangular sheet 4. FIG. 2 is drawn with the scale reduced to half that of FIG. The vertical dimension of the figure is larger than the width. The upper portion of FIG. 2 constitutes the back surface portion of the sandbag bag 1 shown in FIG. 1, and the lower portion constitutes the bag-shaped portion 2 of the sandbag bag 1. In the figure, the solid line shows the cutting line and the dotted line shows the folding line.

  A rectangular sheet portion surrounded by broken lines 7 and 8 in the rectangular sheet 4 is a portion that constitutes the bottom surface of the bag-shaped portion 2 of the sandbag bag 1 shown in FIG. 1. First, the broken line 9 is folded to fold the lower part of the rectangular sheet 4 to the back side of the sheet so that the broken line 9 becomes the top of the valley fold. Next, the folded portion is folded back to the front side of the rectangular sheet 4 with the broken line 7 as a crease. The broken line 7 is the top of the mountain fold. Then, the lower portion of the rectangular sheet 4 is folded back to the front side of the rectangular sheet 4 with the broken line 8 as the fold line. The broken line 7 is the top of the mountain fold. The intervals between the broken line 7 and the broken line 9 and between the broken line 8 and the broken line 9 are the same. When viewed from the right side in this state, it becomes like the lower half of FIG. The scale of FIG. 3 is the same as that of FIG. According to claim 1, the lower end side of the vertically long rectangular sheet 1 is folded back toward the front side, and the lower end portion of the folded sheet is folded upward into a chevron shape and pushed between the front side sheet and the rear side sheet. This state is meant.

  The width of the cutting lines 10a and 10b in the upper part of FIG. 2 is made equal to 1/2 of the distance between the broken lines 7 and 8. Using these cutting lines 10a and 10b, the elongated portions are folded toward the center of the lateral width on the back surface side of the rectangular sheet 1 with the broken lines 11a and the broken lines 11b parallel to the left and right sides of the rectangular sheet 1 on the upper side thereof as folds. The right side view of the folded state is the upper part of FIG.

  The solid line and the shaded line (coarse broken line) in FIG. 4 represent a state in which the lower part and the upper part of the rectangular sheet 1 are folded and viewed from the front side. After folding, sew the inner side of the overlapping part slightly inside. The fine broken lines in the figure represent sewing lines. The horizontal side portions of the upper and lower central portions are the openings of the bag-shaped portion 2 and are not sewn. When the sewing is completed, the bag-shaped portion 2 is formed in the lower portion, and the back side sheet of the bag-shaped portion 2 has a shape protruding upward from the back side thereof. Since the bag-shaped portion 2 can store sand and sand, it can be used as a sand bag even in this state.

  In the sandbag bag in the state shown in FIG. 4, the outer edges of the left and right sewing lines of the bag-shaped portion 2 appear on the outer surface of the sandbag bag, which is not good-looking. To move and hide this portion inside the bag-shaped portion 2, the bag-shaped portion 2 is turned upside down and the portion that was the inner surface is exposed to the outer surface. FIG. 5 is a view of the inverted shape viewed from the front side of the bag-shaped portion 2. In the state of this figure, the front side sheet and the back side sheet of the bag-shaped portion 2 are in contact with each other. Folding along the broken line 7, the broken line 8 and the broken line 9 shown in FIG. 2 is opposite to the state shown in FIG. 4 in the state of FIG. 5, and diagonal portions appear on the lower left and right sides of the bag-shaped portion 2, The portion below the hiding line 9 in FIG. 5 is folded into a forked shape that is convex upward when viewed from the side.

  From the state shown in FIG. 5, push down the hideout line 9. That is, the broken line 9 part in FIG. 2 is made flat, and the part surrounded by the broken line 7 and the broken line 8 is made flat. FIG. 6 is a front view in a planar state, and FIG. 7 is a right side view. FIG. 8 is a perspective view of that state. In FIG. 1, the hiding lines of FIG. 8 are hidden. In these drawings, the opening of the bag-shaped portion 2 is a quadrangle, because it is a drawing that is theoretically strictly drawn. The sandbag 1 is made of a flexible sheet. Therefore, in the actual sandbag 1, the square corners of the opening of the bag-shaped portion 2 are rounded, and the corners of the bottom surface and the side surfaces are also rounded.

  In the drawings so far, the length of the portion projecting upward from the back surface side of the bag-shaped portion 2 is drawn to be about 1.2 times the depth of the bag-shaped portion 2. The length is 1 to 3 times the depth of the bag-shaped portion 2, or a very long dimension such as more.

  Further, as the bag material of the sandbag bag 1, a sheet woven with a basalt fiber thread is used. Basalt fiber is a natural material of 100% basalt, a type of volcanic rock. It has high weather resistance, very little deterioration, is lightweight, non-flammable, has a lot of tension and elasticity, and is also excellent in water resistance, acid resistance, and alkali resistance. It is the most suitable material for sandbags that come into contact with such soil. Since the sheet made of woven fibers is water permeable, water does not collect in the sandbag.

  Next, a method of constructing an embankment using the sandbag bag 1 having such a configuration for reinforcing the embankment will be described. FIG. 9 is an explanatory diagram of the construction procedure. First, as shown in (1) of FIG. 9, the sandbag 1 filled with soil is laid on the embankment construction ground 10 with the bottom surface of the sandbag 1 facing the slope. The back side sheet protruding portion 1a protruding from the back side of the bag-shaped portion 2 is in a state of being horizontally expanded in the inward direction of the embankment. Next, as shown in FIG. 9 (2), soil is laid on the back side sheet protruding portion 1a and on the ground 10 not covered by the protruding portion 1a. The thickness of the soil to be piled up is substantially equal to the thickness of the bag-shaped portion 2. If necessary, apply pressure from above to harden the heaped soil.

  Next, as shown in (3) of FIG. 9, a second sandbag 1 filled with soil is laid on them. The bottom surface of the second sandbag 1 is set at a position slightly displaced from the bottom surface of the first sandbag 1 in consideration of the angle of the slope to be completed. The rear-side sheet protruding portion 1a of the second sandbag 1 is placed in a state of being horizontally expanded inward of the embankment as in the first step. Then, as in the case of the first step, soil is laid on the back side sheet protruding portion 1a and on the first step embankment that the protruding portion 1a does not reach. As a result, as shown in FIG. 9 (4), the embankment whose height is equal to the thickness of two sandbags is formed. By the same procedure, the third stage is completed as shown in (5) and (6) of FIG. Hereinafter, the embankment with the required height is constructed by repeating this work.

  In the embankment constructed in this manner, even if the sandbag forming the slope is subjected to the earth pressure toward the outside of the slope, the rear sheet protruding portion 1a of the sandbag bag 1 works to prevent the sandbag from moving. .. That is, since the back side sheet protruding portion 1a extends inside the embankment and is sandwiched between upper and lower soils, it strongly resists pulling out. As a result, deformation and collapse of the embankment are prevented. Moreover, the construction method using such sandbags has an advantage that the construction work of the soil wall is easier than the construction method of laying the geotextile planar reinforcing material on the entire surface.

(Other embodiments)
In the above-described embodiment, as shown in FIG. 2, with the broken lines 11a and the broken lines 11b parallel to the left and right sides of the upper rectangular sheet 1 as folds, these elongated portions are folded toward the center of the lateral width on the back side of the rectangular sheet 1. Although the overlapping edges are sewn together, this folding may be eliminated. In this case, the sandbag has an appearance as shown in FIG. FIG. 11 is a plan view showing a state in which a plurality of such sandbags 20 are horizontally arranged and viewed from above. Overlapping portions 21 indicated by diagonal lines are formed on the back sheet 3 of the adjacent sandbags 20. Since such an overlapping portion 21 is generated and the area of the back sheet 3 sandwiched between the upper and lower soils is increased, there is an advantage that a stronger resistance to the pulling out of the sandbag is exhibited.

  In the drawings, 1 and 20 are sandbags, 2 is a bag-shaped portion, 3 is a back side sheet, 4 is a rectangular sheet, 5 is a front side, 10a and 10b are notches.

Claims (5)

A sandbag bag used as a sandbag for embankment reinforcement installed on the slope of the embankment,
The sandbag bag is formed by folding the lower end of a rectangular sheet, which is long in the vertical direction, toward the front side of the sheet, folding the lower end of the folded sheet into an upwardly convex chevron, and pressing it between the front and back sheets. In this state, a portion where four sheets are folded is provided, and in this state, the overlapping portions at the left and right ends of the sheets are sewn together to form a bag having an opening at the front end on the front side. A sandbag bag for a sandbag for embankment reinforcement, characterized in that the vertical dimension of the unfolded rectangular sheet is adjusted so as to project upward by 1 to 3 times the vertical dimension.   The sandbag bag according to claim 1, wherein the bag-shaped portion is folded back so that the bag-shaped inner surface becomes an outer surface, and the portion that is folded and pushed in a mountain shape between the front-side and rear-side sheets is planar. A sandbag bag for embankment reinforcement, characterized in that it is spread out to form the bag bottom of the bag-shaped part.   The sandbag according to claim 1 or 2, wherein the boundary portion between the backside sheet portion of the backside portion of the bag-shaped portion and the backside sheet portion of the portion protruding above the bag-shaped portion is from the left and right ends. A sandbag for embankment reinforcement, characterized in that a notch having a length equal to the height of the chevron portion of the portion that was folded and pushed in a chevron shape is provided between the front and back side sheets toward the center of the seat width. Sandbags.   The sandbag bag according to claim 3, wherein the upper portions of the left and right cuts in the back sheet that project upward from the bag-like portion are folded toward the center of the lateral width of the back sheet, and the overlapped edges are Sandbags for embankment reinforcement sandbags that are sewn together.   The sandbag bag for embankment reinforcement according to any one of claims 1 to 4, wherein the sandbag bag is formed of a sheet woven using a yarn of basalt fiber. Sandbags.