JPH10237840A - Method for filling sandbag mat with sand - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for filling a sandbag mat with sand, that is economical when filling the sandbag mat with a slurry and allows extra water mixed with silt or the like to be taken out without escaping into water. SOLUTION: In a sandbag mat in which a water-impermeable inner bag 22 having a greater diameter than a pressure-resistant outer bag 22 is placed inside the outer bag 22, a slurry of water and sand mixed inside a stirring tank is supplied from one end of the inner bag 22. Extra water is taken out from the other end of the inner bag 22 and fed to a recirculation tank 6, inside which the sand and silt are precipitated to supply only the water again to the stirring tank 5. The injection part and the discharge part of the sandbag mat 1 filled with the sand are fastened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing the erosion of beaches and the like and the scouring of seawalls and the like, when laying a sandbag mat in which a sand slurry is filled in a sandbag. The present invention relates to a method for filling sand into a sandbag mat that does not allow wastewater to escape into the water around the sandbag mat.

[0002]

2. Description of the Related Art Conventionally, as described above, prevention of coastal erosion,
In order to prevent scouring of revetments, a plurality of sand bag mats containing sand are connected and laid on sandy beaches or the sea floor where measures to prevent erosion and scouring are required. In this case, according to the conventional method of laying a sand bag mat, a slurry in which sand and water are mixed is supplied into a non-permeable bag having a water-permeable portion at the front end and an open rear end. The slurry is suddenly fed into a bag with a diameter larger than the diameter of the pipe, and the flow rate of the slurry is slowed down in the bag.As a result, fine sand is precipitated in the bag and separated from the sand. Filling and laying sand into sandbag mats has been performed by flowing water containing water into the water from the tip of the bag.

[0003] However, if the bag is made of only a water-impermeable material, the water-impermeable material must be pressure-resistant.
Sandbags are very expensive and therefore uneconomical. On the other hand, the outflow of water mixed with silt into the water as described above may cause a problem in some places because it may cause environmental degradation.

[0004]

SUMMARY OF THE INVENTION The present invention relates to an economical method of filling sand into a sandbag mat, and a method of filling a sandbag mat with a sand mixed with water. Provided is a method for filling sand into a sandbag mat, which can perform without leaving waste water in water.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to a sand bag mat in which a non-permeable inner bag having a diameter larger than that of the outer bag is arranged in a pressure-resistant outer bag. Supply the slurry mixed with water and sand, take out the residual water from the other end of the inner bag, and fill the sand bag mat filled with sand. And furthermore, after taking out residual water from the other end of the inner bag, sending it to the reflux tank, precipitating sand and silt in the reflux tank, and using only water again to the stirring tank, The method comprises a method of filling sand into a sandbag mat that binds an injection portion and a discharge portion of the sandbag mat filled with sand.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a sand bag mat according to an embodiment of the present invention, in which a method for filling sand into a sand bag mat is described. The work procedure for filling will be described. FIG. 1 is a schematic layout side view of equipment for laying the sand bag mat.

First, a certain amount of sand introduced into the hopper 8 by the backhoe 16 shown in FIG. 1 is fed into the stirring tank 5 via the belt conveyor 11 by the vibrating feeder 9 attached to the lower part of the outlet of the hopper 8. It is thrown. At this time, the inside of the stirring tank 5 and the suction / drainage pipes attached to the stirring tank 5 are previously filled with water by the water supply pump 1, and the overflowed water is discharged to the overflow tank 7. The intake and drainage pipes are not clogged with sand.

The sand and water supplied as described above are constantly mixed and stirred by the stirrer 4 provided in the stirring tank 5, and for example, in this embodiment, the slurry is adjusted to a slurry having a mud content of about 10%. You. Next, the slurry obtained by mixing the adjusted water and sand is, for example, 150 mm by a sand pump 2.
It is pressure-fed to a sand bag mat 18 via a pipe hose 17 having a diameter, and is filled as shown in FIGS.

Therefore, the sand bag mat 18 is laid by manpower or the like at a predetermined position where a laying net 10 (geogrit) or the like is previously laid on the lagoon or the like to be laid. The mat 18 is made of, for example, polyester and nylon having pressure resistance and has a cylindrical shape having an effective length L as shown in FIG. The outer bag 21 has a double bag structure in which an inner bag 22 having a water-impermeable property such as PVC and having a diameter larger than that of the outer bag 21 is placed.

In this embodiment, as shown in FIG. 5, the diameter of the inner bag is increased by about 40 mm with respect to the diameter of the outer bag 21 of 700 mm, and as shown in FIG. A bag inlet 20 is provided, and an inner bag 22 and an outer bag 2
1 are separately manufactured in advance, from which the inner bag 22 is put into the outer bag 21 and the inner bag inlet 20 is sewn. Next, as shown in FIGS. 2 and 3, the slurry obtained by mixing the water and the sand supplied from the pipe hose 17 is supplied through the distribution pipe 24 from the injection portion 19A at one end of the inner bag 22 of the sandbag mat 18. The sand S in the slurry is settled from the inlet portion into the inner bag 22 due to a sharp decrease in the speed caused by being supplied into the bag 22 and entering the large-diameter inner bag 22 from the small-diameter piping hose 17. .

At this time, the spill water and the small particles of non-precipitated sand or silt contained in the spill water are taken out together with the spill water from the discharge portion 19B at the other end of the inner bag 22, sent to the reflux tank 6, and collected. Is done. Next, silt, fine sand, and the like settle in the reflux tank 6, and only water is sent to the stirring tank 5 again by the reflux pump 3 and reused.

After the filling of the sand in the sand bag mat 18 is completed as described above, the switching valve of the distribution pipe 24 is operated and switched.
The water supply of the slurry is stopped, and water is circulated to wash the respective pipe hoses 17 and the like, thereby removing the sand precipitated in the pipes. Next, the injection bag portion 19A and the discharge bag portion 19B of the sand bag mat 18 filled with sand are tied with a rope, and the base portion of the special hardware set in the distribution tube 24 of the sand bag mat 18 and the distribution tube 24. And the base of the next sand bag mat 18 to be filled with sand is connected to the distribution pipe 24.

The operations of the above procedure are repeated to fill the sand bag mat 18 one after another with sand, and the sand bag mats 18 are connected and laid on a beach or the like where erosion prevention measures are required. In addition, if the mixed residual water such as silt can be released into the water, equipment after the hose to the reflux tank becomes unnecessary.

[0014]

The sand bag mat used in the method of the present invention described above is a double bag in which a water-impermeable inner bag is placed in a pressure-resistant outer bag. Since the outer bags can be manufactured separately, the manufacturing efficiency is high, the manufacturing cost is low, and the cost of laying the sand bag mat can be reduced.

Further, the residual water containing silt and the like in the slurry obtained by mixing the water and the sand supplied to the sand bag mat is returned to the stirring tank without escaping into the water and reused as water. If the mat is filled with the slurry of sand, the surroundings of the place where the sand bag mat is laid are not polluted.

[Brief description of the drawings]

FIG. 1 is a schematic layout side view of a facility for laying sandbag mats in one embodiment for filling sand into sandbag mats by applying the filling method of the present invention.

FIG. 2 is a side sectional view showing a main part of the sand bag mat of FIG.

FIG. 3 is a perspective view of the sandbag mat of FIG. 2;

FIG. 4 is a schematic perspective view of the sandbag mat of FIG. 3;

FIG. 5 is an enlarged front sectional view in the direction of arrow AA in FIG. 4;

[Explanation of symbols]

 5 Stirring tank 6 Reflux tank 18 Sand bag mat 19A Injection part 19B Discharge part 21 Outer bag 22 Inner bag

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideo Kishimoto 6-3 Matsuoda Higashicho, Nagafu, Shimonoseki City, Yamaguchi Prefecture Inside Toa Construction Industry Co., Ltd. (72) Inventor Toshio Arakawa 6-3 Matsumatsu Odahigashicho, Shimonoseki City, Yamaguchi Prefecture Toa Construction Industry Co., Ltd.

Claims (2)

[Claims] 1. A slurry in which water and sand are mixed in an agitating tank from one end of an inner bag of a sand bag mat in which a water-impermeable inner bag having a diameter larger than that of the outer bag is disposed in a pressure-resistant outer bag. And a method of filling sand into the sand bag mat, which tightly binds an injection portion and a discharge portion of the sand bag mat filled with sand by taking out residual water from the other end of the inner bag. 2. A slurry in which water and sand are mixed in an agitating tank from one end of an inner bag of a sand bag mat in which a non-permeable inner bag having a diameter larger than that of the outer bag is disposed in a pressure-resistant outer bag. Supply, take out the residual water from the other end of the inner bag, send it to the reflux tank, sediment the sand and silt in the reflux tank, and supply and use only water again to the stirring tank,
A method for filling sand into a sandbag mat that binds an injection portion and a discharge portion of the sandbag mat filled with sand.