JP2006057325A - Banking sandbag, and banking method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a banking sandbag which contains therein wet soil as a banking material, and contributes to construction of a durable bank body, and to provide a banking method using the banking sandbag. <P>SOLUTION: The banking sandbag is formed of a water permeable material like a flat yarn textile, and includes a sandbag main body and wide sheet-like or cylindrical joint pieces sequentially extending from the sandbag main body. The banking method is carried out by piling up the sandbags thus formed by mounting the sandbag on the sheet-like joint piece of another sandbag or fitting the sandbag into the cylindrical joint piece of another sandbag. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an embankment for embankment capable of constructing a durable embankment and a embankment method using the same. More specifically, the embankment can be used to build a dam body that can use wet soil such as the bottom mud of a pond as a fill material and can withstand temporary overflow of water stored in the pond. Sandbags and embankment methods using them

  Since the mechanical safety of the dam body is mainly dependent on the strength of the soil material portion, it is generally constructed using a high quality soil material. As the method, a high-quality soil material is spread to a uniform thickness, for example, about 30 cm, compacted with a compacting machine, and this procedure is repeated several times to the top. By repeating this thin layer rolling and rolling operation, the soil material is laminated at a uniform density, and since there is little variation in strength, a pond body can be constructed.

  However, this construction method requires an embankment site in the vicinity of the embankment, and it is necessary to search for a high-quality soil material and carry it in from there. The impact cannot be ignored. In addition, many ponds are old in construction, and soft bottom mud such as sand and sludge accumulates, causing a decrease in water storage capacity and deterioration of water quality. There are many things. Conventionally, such bottom mud has not been used due to insufficient performance as a reinforcing embankment and has been disposed of, but it is difficult to secure a disposal site.

  In addition, even if the dam body is reinforced with the above-mentioned high-quality soil material, additional facilities such as spillway are set up separately because there is a possibility that it will directly lead to a catastrophic collapse if the reservoir overflows. is the current situation. Such a facility is a concrete structure that is installed in a place where the ground such as a natural ground is solid, and since it has a large water collection area, it becomes a large-scale structure in the pond. Will require a detailed ground survey. In addition, a large structure will also apply a large load to the natural ground, and it is considered that water leakage is likely to form during an earthquake, and the construction cost is high and the economic burden increases. come.

  There are 210,000 ponds in the country, but it is estimated that the number of ponds will reach 20,000 because they are old and need to be repaired. Therefore, the pond body and its simple embankment method were developed to maintain the strength of the pond body by quickly restoring the function of the pond to ensure the strength of the pond body and to improve the disaster prevention function of the community at the same time. Is desired.

  For this reason, as an example of a method for reinforcing the pond body, a method has been proposed in which the reinforced part of the dam body is excavated, and solidified material such as cement is mixed with the excavated soil to form a solidified clot, and this is backfilled ( Patent Document 1). This method has the advantage that excavated soil can be used, but requires solidification treatment.

JP 2003-20625 A

  An object of the present invention is to provide an embankment for embankment capable of constructing a durable embankment and an embankment method using the same. Another object of the present invention is to use an embankment for embankment that can be used for reinforcing a pond because it is aged, and that can be used as a reinforcing soil for the bottom mud and excavated soil as described above. The purpose is to provide the embankment method. Another object of the present invention is to provide an embankment for embankment and an embankment method using the same, which are less likely to be damaged during compaction after placing the sandbag and can be evenly compacted.

  ADVANTAGE OF THE INVENTION According to this invention, the sandbag which has the connection piece connected with the sandbag main body in at least 1 direction is provided. The connecting pieces are preferably provided in 1 to 3 directions, and each connecting piece is preferably in the form of a sheet having a wide width, for example, a width equal to or greater than the width of the sandbag body. Moreover, the said connection piece may be a cylindrical thing which can insert at least one part of another sandbag. It is also preferable that the sandbag body is provided with a temporary stitching portion for reducing the capacity thereof, and the space in the sandbag can be increased by removing the temporary stitching portion after filling with the filler.

  The sandbag is preferably made of water-permeable geosynthetics, particularly preferably flat yarn knitted fabric. The sandbag can be filled with wet soil.

  According to the present invention, there is also provided an embankment method for embankment using a sandbag provided with wide sheet-like connecting pieces in 1 to 3 directions and placing the sandbag on a connecting piece of another sandbag. According to the present invention, there is also provided a bank embankment method in which a sandbag having the above-described cylindrical connecting piece is used, and a bank is built while placing the sandbag so that another sandbag is inserted into the connecting piece of the sandbag. According to the present invention, the sandbag body is provided with a wide sheet-like connecting piece in one to three directions. The sandbag partly opens, and one connecting piece closes the opening, and the top of the sandbag. An embankment method is provided in which sandbags are placed on top of and covered with sandbags. After the sandbags are piled up by the above-mentioned embankment methods, they are preferably compacted. According to the present invention, there is also provided an embankment method in which a sandbag provided with a temporary stitching portion for reducing the capacity thereof is used, and after placing the sandbag filled with the filler, the temporary stitching portion is removed and compacted.

  When a bank is built using the sandbag for embankment according to the present invention, simply connecting the sandbags produces the effect of connecting the sandbags based on the connecting pieces, so that a durable bank body can be constructed. For example, it is possible to construct a bank body that can withstand collapse even when a temporary overflow occurs. Further, by using a water-permeable geosynthesis as a sandbag, even when wet soil such as bottom mud soil or excavated soil is filled, it can be dehydrated by compaction, so that it can be used as it is as reinforced soil. Further, according to the present invention, by using a sandbag having a specific structure, it is possible to perform uniform compaction without damage in the compacting work, and thus it is possible to construct a strong bank body.

  The sandbag according to the present invention is formed by connecting one or more, preferably 1 to 3 connecting pieces capable of enhancing the holding property when two or more sandbags are associated with each other to the sandbag body. . In general, the connection piece is enhanced by laying a connecting piece of one sandbag under another sandbag. Therefore, it is preferable that the connecting piece has a wide sheet shape, and the laying effect is sufficient. In order to express, it is preferable to have a sufficient width, for example, a width equal to or greater than the width of the sandbag. In addition, a width | variety means the length of the connection direction of a connection piece here. In addition, the connection can be improved by forming the connecting piece in a cylindrical shape and placing it so that at least a part of the other sandbag is inserted. In this case as well, it is preferable to have a corresponding cylinder length in order to sufficiently exhibit the coupling effect. By using such a sandbag, it is possible to construct a bank body that is firmer than a general bank using a sandbag.

  FIG. 1 is a drawing showing an example of a sandbag 1 in which sheet-like connecting pieces 11, 12, and 13 are provided on three sides. The connecting pieces 11, 12, and 13 each have a width approximately equal to the width of the sandbag. . FIG. 2 is a schematic view showing a state in which such a sandbag 1 is used, stacked in three horizontal rows, and the connecting pieces 11 and 12 are laid under other sandbags. Not shown. The connecting piece 12 on the right side of the sandbag stacked in the center is laid under the right upper sandbag at the upper part of the right sandbag, and the connecting piece 11 on the left side is laid under the left sandbag. Yes. In addition, the right connecting piece 12 of the sandbag stacked on the left side is similarly laid under the central sandbag on the diagonally upper right, and the left connecting piece 11 of the sandbag stacked on the right side is the left central part. It is laid under the sandbag, and the integration between the sandbags is reinforced by these. In this embodiment, the left connecting piece 11 of the left sandbag and the right connecting piece 12 of the right sandbag are only arranged on the respective sandbags and do not help strengthen the integration. Integration can be strengthened by connecting them with a connecting means using pins, needles, ropes or the like. Further, the longitudinal connection pieces (not shown) can be strengthened in the longitudinal direction by carrying out similar laying between sandbags arranged and laminated in the longitudinal direction.

  FIG. 3 is a drawing showing the sandbag 2 in which sheet-like connecting pieces 14 and 15 having half the length of a sandbag are provided in two directions and a cylindrical connecting piece 16 having a half length of the sandbag is provided on one side in the longitudinal direction. By integrating the sandbags 2 so that the connecting pieces 14 and 15 are laid in the same manner as the connecting pieces 11 and 12 of the sandbag 1 in FIG. 2, the integration similar to FIG. 2 can be achieved. it can. Further, in the arrangement of the sandbag between the longitudinal directions not shown in FIG. 2, when the sandbag 2 of FIG. 3 is used, the sandbag is placed so that a part of the sandbag adjacent to the cylindrical connecting piece 16 is inserted. By this, when the sandbags are stacked, the integration in the front and rear direction and the vertical direction can be strengthened.

  FIG. 6 is a view showing a sandbag 5 having a sheet-like connecting piece 17 and a temporary stitching portion 6 substantially equal to the sandbag width on one side. The sheet-like connecting piece 17 increases the connecting effect between the sandbags when the sandbags are stacked, similarly to the sandbags of FIGS. 1 and 3. In addition, if the filling is filled with the temporary stitching portion 6 provided, the sandbag of the filling portion becomes tensioned and is easily damaged by external force such as compaction force. However, after filling, the sandbag is tensioned by removing the temporary stitching portion before compaction. The state is relaxed and uniform compaction can be achieved, and the sandbag can be prevented from being damaged.

As a material for the sandbag, it is preferable to use water-permeable geosynthetics from the viewpoint that when wet soil is used as the filling soil, it can be dehydrated by compaction and is excellent in strength and durability. Geosynthetics can be knitted fabric or non-woven fabric, but it uses flat yarn knitted fabric with excellent strength, durability and water permeability, especially polyolefin laid flat yarn woven fabric. It is preferable. A suitable flat yarn has a single yarn fineness of about 300 to 2000 denier, a basis weight of 50 to 500 g / m ² , and a porosity of about 5% or less. Knitted and knitted fabrics, warp knitted fabrics, and the like can be used. When using such a hydrophobic flat yarn woven fabric, in order to increase water permeability, it is possible to use a kneaded surfactant in advance or a coating with a surfactant. it can. When filling some sandbags with a large particle size filler such as crushed stone in order to give a water permeability function and strength, a coarse grid can be used as the sandbag material.

  Of course, the sandbag may be filled with high-quality soil, but wet soil such as excavated soil generated from the bottom mud of the pond or near the site can also be used. Even if such wet soil is used, if a water-permeable material as described above is used as the sandbag material, it can be dehydrated and removed by compaction after the sandbags are stacked, so that a high-strength dam body should be used. Is possible. However, if desired, as in the above-mentioned proposal, a hardened material added with a hydraulic substance may be filled. Furthermore, you may fill with water-permeable materials, such as a crushed stone and a rubble material. By filling such a water permeable material, the drainage effect is added and the infiltrating line of the levee body is reduced, so that the strength of the dam body itself can be increased and the effect of preventing the dam body soil from being sucked out is also achieved. Appears and the levee stabilizes.

  Although the size of the sandbag varies depending on the scale of construction, an elongate shape having a total length of about 2 m is preferable because heavy machinery work is easy. The filling is usually filled at a construction site, and the sandbag is sealed by sewing the opening with other sealing means. However, without adopting such a sealing means, it is possible to achieve a sealing effect by the weight of the sandbags piled on the top of the sandbag by employing a method of winding back to the top of the sandbag so as to close the opening using the connecting piece. In addition, since a large tension state of the sandbag due to filling can be avoided, compaction can be facilitated and breakage of the sandbag can be prevented.

  In both cases where a new embankment is built or when an existing pond embankment is to be reinforced or restored, a sandbag filled with the filler is built up on the slope opposite to the water retention side. In this case, it is preferable that the top end portion is also piled at the same time, and if necessary, the sandbag can also be piled on the water retention side slope. In the case of reinforcement and restoration of existing ponds, sandbags can be directly piled up, but as described in the above-mentioned publication, excavation work may be performed in advance on part or all of the construction part, and then sandbags may be piled up. .

  In the sandbag pile as described above, the slope of the bank is stacked with a width of 1 to several rows, preferably several rows up to the top so as to cover the entire slope. In addition, the top of the bank body is preferably spread over a wide area with a thickness of one to several layers, preferably several layers, with no gaps. The water storage side slope of the levee body may be formed by a conventional construction method, or may be constructed by applying the same sandbag construction method as described above.

  By strengthening the relationship between the sandbags in this way, integration between the sandbags is ensured, so that the ground rigidity in the vicinity of the levee body surface and the slope portion is increased, and the strength of the entire dam body is improved. Accordingly, it becomes possible to construct a bank body having a steep slope. In this case, in order to construct a more durable levee body, it is effective to horizontally dispose geosynthetics between the sandbags stacked along the slope. The geosynthetics that can be used here include geotextiles, geogrids, geonets, and the like, and any of them can be suitably used in the present invention, but it is particularly preferable to use a geogrid from the viewpoint of strength reinforcement. In particular, when the drainage function is important, it is preferable to use a geotextile. For example, a grid-like geogrid in which a plastic net structure is stretched uniaxially or biaxially and the vertical axis and horizontal axis are integrated at the intersection is lightweight and highly rigid. It is particularly suitable because it has a tensile strength and has a strong binding force on soil and sandbags. As such a product, Mitsui Chemicals, Inc., product name Tensor can be mentioned. In addition, using geotextiles such as thick non-woven fabrics has a drainage function as well as soil binding force, so that unnecessary water in the levee body can be drained at an early stage to reduce the infiltrating line and strengthen the dam body ground. it can.

  The geosynthetics can be disposed for each layer of the laminated sandbags or for every several layers. In that case, the geosynthetics may be simply disposed between the sandbags, or may be disposed so as to enclose a group of stacked sandbags. By the geosynthetics thus arranged, the strength between the stacked sandbags is further reinforced, and the strength of the dam body by the integrated sandbag can be further increased.

  This geosynthetics can also be extended from between the soil to the inside of the levee body, which further promotes the integration of the inside of the dam body and the sandbag stack, so the entire dam body It is possible to improve the durability. As a result, the slope on the opposite side of the water storage side can be made closer to a vertical state from a steep slope, which contributes to land saving, rehabilitation of old ponds and enhancement of performance. In addition, the same construction on the slope side of the water storage side contributes to the prevention of slope collapse due to the sudden drop of the water storage.

  If geosynthetics with drainage function is inserted and arranged inside the bank from the time the sandbags are stacked, water inside the bank can be actively guided to the outside, and the water level rises in the bank. Strength reduction can be prevented. This also leads to a further reduction in the required levee body cross-sectional area, which is advantageous in terms of construction costs.

  In addition, when the geosynthetics inserted from the slope opposite to the water storage side is extended to the water storage side slope, the entire reservoir basin body can be integrated. Safety against surface slippage is improved.

  Thus, according to the construction method of the present invention, the erosion resistance accompanying the overflow of the levee body surface portion is enhanced by the use of a sandbag with connectivity and the reinforcing effect of geosynthetics, and the wall having high rigidity The characteristics of the body can be expressed, and the safety of the bank can be improved. Accordingly, it becomes possible to make the levee body cross section steep or down. Furthermore, by using a sandbag, the entire bank can be made to follow the settlement of the ground.

  FIG. 4 is a schematic sectional view showing an example of reinforcement of a pond dam body using the sandbag of the present invention. Since it was constructed by a conventional construction method, one slope of the dam body portion 21 in the pond body is in contact with the water reservoir 22, and the other slope 23 is a structure 24 composed of a sandbag group formed by the sandbag 3 of the present invention. And both are united. The bank body part 21 may be a newly installed bank body or a bank body of an existing pond.

Such a structure 24 can be constructed by the following construction method. First, the sandbag 3 is piled up to the height reaching the top end 26 from the surface of the ground 25 so as to be in close contact with the slope 23 opposite to the water storage side of the main body portion 21. The sandbags 3 are sequentially stacked toward the upstream side and / or the downstream side along the slope 23 of the pond. However, the sandbags 3 may be stacked in one row outward from the slope 23, and may extend over two or more rows. You may laminate. In FIG. 1, the structure 3 is strengthened by stacking in three rows. Further, in contact with the surface of the top end 26 of the levee body portion 1, the sandbag 6 is spread without gaps so as to cover the surface of the top end 26, and the sandbag 3 is stacked in several stages as necessary. In FIG. 4, the surface of the top end 26 is strengthened by stacking in two steps. In FIG. 4, the sandbag 3 on the slope 23 side is layered by digging the ground 25 and layering the underground portion over several rows and several stages to further strengthen the sandbag stacking portion.

  In this way, the surface of the levee body portion 21, that is, the slope opposite to the top end and the water storage side, is covered with a large number of sandbags 3. When the sandbags 3 are laid or stacked, the sandbags are shown in FIG. 2. By stacking as shown, the vertical, horizontal, or diagonal directions are related to each other and the integration is enhanced.

  Further, in the embodiment of FIG. 4, the geosynthetics 4 is horizontally disposed between the many sandbags 3 stacked on the slope 23 side. Here, geogrid is used as geosynthetics. The geosynthetics 4 is disposed between several stages of sandbags 3, and is preferably extended and inserted from between the sandbags 3 to the inside of the bank body portion 21. Further, the geosynthetics 4 may be laid on the top end 26 portion.

  FIG. 5 is a schematic cross-sectional view showing another construction example of the pond bank body using the sandbag of the present invention. In this embodiment, the sandbag 3 covers both the slope 27 on the side of the water storage 22 of the main body 21 and the slope 23 on the opposite side and the top end 26. Here, a method of wrapping a group of sandbags 3 stacked in three layers with geosynthetics 4 is used, making the dam body more durable and suitable as a pond repair method because it has become aged. .

  Vegetation can be applied to the slope and / or top edge reinforced by the sandbag as described above for the purpose of further improving the strength and imparting the landscape.

It is a perspective view which shows an example of the sandbag of this invention. It is drawing which shows an example of the use condition of the sandbag of this invention. It is a perspective view which shows the other example of the sandbag of this invention. It is the schematic which shows an example of the embankment method using the sandbag of this invention. It is the schematic which shows the other example of the embankment method using the sandbag of this invention. It is a perspective view which shows the other example of the sandbag of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sandbag 2 Sandbag 3 Sandbag 4 Geogrid 5 Sandbag 6 Temporary stitching part 11 Sheet-like connecting piece 12 Sheet-like connecting piece 13 Sheet-like connecting piece 14 Sheet-like connecting piece 15 Sheet-like connecting piece 16 Cylindrical connecting piece 17 Sheet-like connecting piece 21 Main body 22 Reservoir 23 Slope 24 Sandbag group structure 25 Ground 26 Top edge 27 Soil side slope

Claims (13)

  A sandbag for embankment having a connecting piece connected to the sandbag body in at least one direction.   The sandbag for embankment according to claim 1, which has connecting pieces in 1 to 3 directions.   The sandbag for embankment according to claim 1 or 2, wherein the connecting piece is a wide sheet-like material.   The embankment for embankment according to claim 1, wherein the connecting piece is a cylindrical object capable of inserting at least a part of another sandbag.   The embankment for embankment according to claims 1 to 4, further comprising a temporary sewing portion for narrowing the capacity of the sandbag.   The sandbag for embankment according to claims 1 to 5, wherein the sandbag is made of water-permeable geosynthetics.   The sandbag for embankment according to claim 6, wherein the geosynthetic is a flat yarn knitted fabric.   The sandbag for embankment according to claim 1, which is filled with wet soil.   An embankment method using the sandbag according to claim 3, wherein the sandbag is laid while being placed on a connecting piece of another sandbag.   An embankment method using the sandbag according to claim 4, wherein the sandbag is placed while the sandbag is placed so that another sandbag is inserted into the cylindrical connecting piece of the sandbag.   The embankment method according to claim 3, wherein the sandbag is partially opened, the connecting piece is disposed so as to cover the opening and covers the top of the sandbag, and another sandbag is stacked on the sandbag. .   The embankment method according to claim 9, wherein the sandbags are stacked and then compacted. A embankment method using the sandbag according to claim 5, wherein the sandbag filled with the filling is placed, and then the temporary stitching portion is removed and compacted.

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