JP5654961B2 - Method of backfilling dredged water collected in the reclaimed ground - Google Patents

Description

  The present invention relates to a method for backfilling dredged water in the ground, and in particular, dredged water in the ground that prevents the outflow of earth and sand from the dredged water in the existing ground. This relates to a backfill processing method.

  In the construction ground in residential land, etc., in order to stabilize the embankment ground during construction, groundwater is drained by laying disaster prevention pipes in the ground. These disaster prevention pipes are formed by a combination of underground drainage culverts and temporary dredging water collecting tanks (see, for example, Patent Document 1). In addition, there are many examples of maintaining the drainage function by leaving the temporary dredged water collection as it is even after completion of the construction work.

  Moreover, in recent years, earth and sand have flowed into the disaster prevention pipes that have deteriorated in the previously created ground, and a collapse accident has occurred in the created ground. In order to prevent such a collapse accident, it is considered to fill the disaster prevention pipe with a filler or the like to prevent the inflow of earth and sand into the disaster prevention pipe.

JP 7-158155 A

  However, there is a concern that if the collected water in the disaster prevention pipe is filled with fillers, the groundwater level in the ground rises due to a decrease in drainage, and the stability of the entire ground is performed. Therefore, in order to backfill the collected water mass while maintaining its function, it is conceivable to fill it with a material having high water permeability such as crushed stone and sand.

  However, in this case, the ground above the water collecting basin is excavated, the lid of the water collecting basin is removed, and crushed stones and sand are thrown in from the upper part, which is very troublesome. In particular, in the case where a house is constructed above the water collecting basin, there is a problem that it is necessary to throw crushed stones away from the house, which further increases labor.

  Accordingly, an object of the present invention is to backfill the dredged water collecting ground by a simple process in order to prevent the inflow of earth and sand into the dredged water collecting water while maintaining the drainage function while backfilling the dredged water collecting water in the created ground. The purpose is to provide a method for backfilling dredged water collected in the created ground.

  A method for backfilling dredged water collecting in a constructed ground according to the present invention that has solved the above-mentioned problem includes a perforated pipe embedded in the created ground in a vertical direction, and a permeable material layer around the perforated pipe. Is formed and is connected to the drain pipe, and is a backfilling method of the drainage water mass, in which a water guide material is formed at a lower end portion of the perforated pipe to form a water guide material layer, and After forming the water channel between the drain pipes, the perforated pipe is filled with a filler.

  In the backfilling method for collecting water in the constructed ground according to the present invention, the perforated pipe is filled with a filler. For this reason, inflow of earth and sand with respect to dredged water can be prevented. However, simply filling the perforated pipe with a filler will make it impossible to exert the drainage function of the collected water. Therefore, in the present invention, a water guide material is disposed at the lower end of the perforated pipe to form a water guide material layer, and a water channel is formed between the water guide material layer and the drain pipe, and then the perforated pipe is formed. The filling material is filled. For this reason, a drainage path for draining groundwater below the portion filled with the filler is formed by the water guide material layer and the water channel. Further, these operations can be performed from a position avoiding the position directly above the water collecting basin, for example, from below or obliquely above the water collecting basin. Accordingly, it is possible to prevent the inflow of earth and sand into the collected water mass while maintaining the drainage function by backfilling the collected water mass in the creation ground, and to refill the collected water mass by a simple treatment.

  Here, a cylinder can be installed in the lower part of a perforated pipe, a water guide material can be arranged between a cylinder and a perforated pipe, and a water guide material layer can be formed.

  In this way, by installing a cylinder in the lower part of the perforated pipe and disposing the water guide material between the cylinder and the perforated pipe to form a water guide material layer, the water guide material is soft. However, the shape can be easily made cylindrical. Therefore, the water guide material layer can be easily formed.

  Moreover, after laying a small-diameter drain pipe smaller in diameter than the drain pipe in the drain pipe and connecting the small-diameter drain pipe and the water channel, the drain pipe can be filled with a filler.

  In this way, by laying a small-diameter drain pipe smaller than the drain pipe in the drain pipe and connecting the small-diameter drain pipe and the water channel, the groundwater collected by the water-conducting material layer can be connected to the pond or It can be easily moved to water collection places such as rivers.

  Furthermore, the water guide material layer can be formed from the drain pipe side, and the filler can be filled from the drain pipe side.

  Thus, by forming the water guide material layer from the drain pipe side and filling the filler from the drain pipe side, the water guide material layer can be easily formed and the filler can be filled easily.

  Further, when filling the filling material, the filling tube and the exhaust pipe are inserted from the lower opening of the perforated pipe, the filling material is filled into the perforated pipe through the filling pipe, and the inside of the perforated pipe through the exhaust pipe. The air can be discharged.

  In this way, the filling tube and the exhaust pipe are inserted from the lower opening of the perforated pipe, the filling material is filled into the perforated pipe through the filling pipe, and the air in the perforated pipe is discharged through the exhaust pipe. Thus, the filler can be smoothly filled into the perforated pipe.

  Also, as the filling pipe and the exhaust pipe, a plurality of filling pipes and exhaust pipes having different lengths are inserted into the perforated pipe, and the filling pipe and the exhaust pipe are filled with the filling material as the filling of the filling material proceeds. be able to.

  In this way, a plurality of lengths of the filling pipe and the exhaust pipe are inserted into the perforated pipe, and the filling pipe and the exhaust pipe are filled with the filling material as the filling of the filling material proceeds, so that the filling pipe and the exhaust pipe are This eliminates the need to re-insert. Therefore, the filling operation of the filler can be performed smoothly.

And a filler can be filled through the boring hole which reaches | attains a perforated pipe from diagonally above the position where the perforated pipe is formed on the ground.

  For example, by using an oblique boring technique, the filling material can be filled by moving it with a lateral component from a position shifted from the position where the perforated pipe is formed on the ground. .

  According to the method for backfilling dredged water in the constructed ground according to the present invention, it is easy to backfill the collected water in the created ground and prevent inflow of earth and sand into the collected water while maintaining the drainage function. The reclaimed water can be backfilled by simple treatment.

It is sectional drawing of the collected water after the backfill process which concerns on embodiment of this invention. It is a sectional side view of the creation ground provided with a water collecting basin. It is a sectional side view of the state where the dredged water reservoir was provided under the residential land. (A) is a perspective view of a water conveyance material layer, (b) is a plane sectional view of a water conveyance material layer. It is process drawing which shows the backfilling process procedure of a water collecting basin. FIG. 6 is a process diagram illustrating a process following the process in FIG. 5. It is a perspective view which shows the water conveyance material layer which concerns on a 2nd form. It is a figure which shows the water conveyance material layer which concerns on a 2nd form, (a) is a perspective view, (b) is a plane sectional view. It is a figure which shows the water conveyance material layer which concerns on a 3rd form, (a) is a perspective view, (b) is a plane sectional view. It is a sectional side view of the water collecting basin of the state filled with a filler by diagonal boring. It is sectional drawing of the water collecting water after another backfilling process.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In each embodiment, portions having the same function are denoted by the same reference numerals, and redundant description may be omitted.

  FIG. 1 is a cross-sectional view of a dredged water collection pad after a backfilling process by a backfilling method for dredged water collecting apparatus according to an embodiment of the present invention. First, the structure of the existing part of the dredged water collection M before the backfilling process will be described. As shown in FIG. 1, the water collecting basin M includes a perforated pipe 1 embedded in the vertical direction. The perforated pipe 1 is made of a corrugated pipe, for example, and has a large number of water-permeable holes formed on its side surface.

  A water permeable material layer 2 is formed around the perforated tube 1. The water permeable material layer 2 is formed by forming holes of a predetermined size on the outer periphery of the perforated tube 1 and filling the holes with large and small crushed stones. The permeable material layer 2 is formed by filling large and small crushed stones, thereby preventing the collapse of the ground due to the formation of pores, while the inflow of groundwater into the perforated pipe 1 in the dredged water collection M Promotes.

  A lid member 3 is provided on the top of the perforated tube 1. The lid member 3 is formed by, for example, forming a water permeable material layer 2 and then placing concrete on the top. By forming the lid member 3, entry of foreign matter from the upper opening to the inside of the perforated tube 1 is prevented.

  Further, a drain pipe connecting portion 4 is provided at a lower portion of the dredged water collecting mass M. The drain pipe connecting portion 4 is made of rectangular concrete, and has an upper opening and a side opening. The upper opening is connected to the perforated pipe 1 and allows groundwater discharged from the perforated pipe 1 to flow.

  Further, the existing drain pipe 5 penetrates through the side opening. As shown in FIG. 2, the existing drain pipe 5 is embedded in the creation ground G, and is connected to a plurality of dredged water collection m. The existing drain pipe 5 circulates groundwater W collected by a plurality of dredged water collectors M and discharges it to a pond or river for a predetermined purpose.

  Further, the dredged water mass M is provided at various positions on the creation ground G. For this reason, as shown, for example in FIG. 3, it may be provided in the basement of the position where the house L is provided. Regardless of whether or not a building is constructed on the ground, the water collecting masturbator M can perform its function. This is the existing structure before the backfilling process in the dredged water collection M.

  Next, the structure after the backfilling process in the dredged water mass M will be described. As shown in FIG. 1, a filler 11 is filled inside the perforated pipe 1 in the water collecting tank M. The filler 11 is made of a material that has fluidity, such as foamed urethane or plastic grout, and that hardens after a curing period and exhibits a certain degree of strength. Therefore, after the curing period has passed, the inside of the perforated tube 1 is filled with the filler 11 after being cured.

  Moreover, the water conveyance material layer 12 which concerns on a 1st form is arrange | positioned at the lower end part in the perforated pipe | tube 1. As shown in FIG. The water guide material layer 12 is disposed along the inner wall portion of the perforated pipe 1. The water guide material layer 12 is formed in a state in which a water-permeable material such as nylon or non-woven fabric is held in a cylindrical shape, and for example, monodrain (registered trademark) or hetimalon (registered trademark) is used. As a specific structure of the water guiding material layer 12, as shown in FIG. 4, a water-permeable material 22 such as nylon is wound around the inner tube 21 which is a water-permeable or water-impermeable cylinder with a certain thickness, and a rubber band 23 It can be formed by bundling and holding the shape.

  Further, as shown in FIG. 1, the water guiding material layer 12 extends from the lower end portion of the perforated pipe 1 to the upper opening in the drain pipe connecting portion 4. A water collecting member 13 is provided at the lower end position of the water guiding material layer 12. The water collecting member 13 is a dish-like member and collects groundwater falling from the lower end of the water guiding material layer 12.

  A water conduit 14 that forms the water channel of the present invention is connected to the water collecting member 13. The water conduit 14 is made of, for example, steel, vinyl chloride, or polyester, and the upper end thereof is connected to the water collecting member 13. Further, a drain pipe 15 which is a small-diameter drain pipe of the present invention is connected to the lower end portion of the water conduit 14. Thus, the water guide pipe 14 guides the groundwater collected by the water collecting member 13 to the drain pipe 15.

  The drain pipe 15 has a smaller diameter than the existing drain pipe 5 and is disposed inside the existing drain pipe 5 so as to reach a pond or a river that the existing drain pipe 5 reaches. Furthermore, the existing drainage pipe connection part 4 and the existing drainage pipe 5 are also filled with the filler 11.

  Next, the backfilling method for dredged water mass according to the present embodiment will be described. FIG. 5 and FIG. 6 are process diagrams showing the backfilling processing procedure of the dredged water mass. As shown in FIG. 5 (a), the dredged water collecting mass M provided on the creation ground G is provided with an existing perforated pipe 1, a water permeable material layer 2, a lid member 3, a drain pipe connecting portion 4 and the like. It is in a state. The backfilling process is started from this state.

  When the backfilling process is started, as shown in FIG. 5B, the drainage pipe 15 is laid in the existing drainage pipe 5, and the water collecting member 13 and the water guide pipe 14 are provided in the drainage pipe connection portion 4. Furthermore, the water guide material layer 12 is inserted into the inside of the perforated pipe 1 from the drain pipe connecting portion 4 side. These operations are performed from the drain pipe connecting portion 4 side. Further, before inserting the water guide material layer 12 into the perforated tube 1, the water-permeable material 22 is wound around the inner tube 21 in advance on the ground or the like and wrapped with a rubber band 23.

  Next, as shown in FIG. 5 (c), a filling tube 31 and an air vent tube 32 that is an exhaust tube are inserted from the lower opening of the perforated tube 1 toward the inside of the perforated tube 1. Each of the filling tube 31 and the air bleeding tube 32 is a small-diameter tubular body, and is a perforated tube for performing air bleeding from the porous tube 1 when filling the filling material 11 and filling the filling material 11, respectively. 1 is inserted. Here, a plurality of filling tubes 31 and air bleeding tubes 32 having different lengths are inserted into the perforated tube 1.

  Subsequently, as shown in FIG. 6A, the pump P is carried into the drain pipe connecting portion 4 and connected to the filling pipe 31. Then, by operating the pump P, the filler 11 is filled into the perforated pipe 1 through the filling pipe 31. With the filling of the filler 11, the air in the perforated pipe 1 is discharged to the drain pipe connecting portion 4 that is outside the perforated pipe 1 through the air vent pipe 32. In addition, in FIG. 5, illustration of the filling pipe | tube 31 and the air vent pipe 32 is abbreviate | omitted suitably.

  When filling of the filler 11 is started, the filler 11 is filled into the perforated tube 1 as shown in FIG. As the filler 11 is filled, the filler 11 moves downward in the perforated tube 1 due to its own weight. By the movement of the filler 11, the filler 11 is also filled inside the water guide material layer 12 provided below the perforated pipe 1.

  Further, the filler 11 is filled from the filling tube 31. After a while, the short filling tube is buried by the filler 11, and the filling is continued as it is. Finally, the longest filling tube 31 is buried in the filling material 11, and the porous material 1 is completely filled in the perforated tube 1 as shown in FIG. Thus, the filling of the filler 11 into the perforated tube 1 is completed.

  When the filling of the filler 11 into the perforated pipe 1 is completed, the pump P arranged in the drain pipe connecting portion 4 is moved into the existing drain pipe 5. Then, the filling material 11 is filled into the drain pipe connecting portion 4 by the pump P. Thereafter, the existing drainage pipe 5 is also filled with the filler 11, and the backfilling process of the dredged water collector M is completed as shown in FIG.

  As described above, in the method of backfilling the collected water mass M in the constructed ground G according to the present embodiment, since the porous tube 1 is filled with the filler 11, the inflow of earth and sand to the collected water mass is prevented. Can be prevented. Filling the perforated pipe 1 with the filler 11 impairs the drainage function of the collected water M, but forms the water conducting material layer 12 at the lower end of the perforated pipe 1 and the water conducting material layer 12. And a drain pipe 15 is provided with a water guide pipe 14. For this reason, it is possible to prevent the inflow of earth and sand into the water collecting water M while backfilling the water collecting function M while refilling the water collecting water M in the reclaimed ground G, and backfill the water collecting water M through a simple treatment. be able to.

  In addition, an inner intubation tube 21 is installed below the perforated tube 1, and a water-permeable material layer 12 is formed by disposing a water-permeable material 22 between the inner intubation tube 21 and the perforated tube 1. For this reason, even if the water-permeable material 22 is a soft raw material, the shape can be easily made into a cylindrical shape. Therefore, the water guiding material layer 12 can be easily formed.

  Further, a drain pipe 15 having a diameter smaller than that of the existing drain pipe 5 is laid on the existing drain pipe 5, and the existing drain pipe 5 and the water guide pipe 14 are connected. For this reason, even if the existing drainage pipe 5 is filled with the filler 11, the groundwater collected by the water guide material layer 12 can be easily moved to a water collection place such as a pond or a river via the drainage pipe 15. .

  Further, the water guide material layer 12 is formed from the drain pipe connecting portion 4 side, and the filler 11 is filled from the drain pipe connecting portion 4 side. For this reason, while being able to form the water guide material layer 12 easily, the filler 11 can be filled easily. Furthermore, the filling tube 31 and the air vent tube 32 are inserted from the lower opening of the perforated tube 1, and the filler 11 is filled into the perforated tube 1 through the fill tube 31, and through the air vent tube 32. The air in the perforated tube 1 is discharged. For this reason, the filling material 11 can be smoothly filled into the perforated pipe 1.

  Further, as the filling tube 31 and the air bleeding tube 32, a plurality of lengths of the filling tube 31 and the air bleeding tube 32 are inserted into the perforated tube 1, and as the filling of the filler 11 proceeds, the filling tube 31 and the air bleeding tube 32 are removed. The tube 32 is filled with the filler 11. For this reason, it is not necessary to perform operations such as reinserting the filling tube 31 and the air bleeding tube 32. Therefore, the filling operation of the filler 11 can be performed smoothly.

  Next, the 2nd form of the water conveyance material layer provided in a perforated pipe is demonstrated. FIG. 7 is a perspective view showing a water conveyance material layer according to the second embodiment, FIG. 8A is a plan sectional view of the water conveyance material layer before mortar injection, and FIG. 7B is a water conveyance material layer after mortar injection. FIG. As shown in FIG. 7, the water guiding material layer 40 according to the second embodiment includes an inner tube 41 inserted into the perforated tube 1, and a plurality of drain members 42 are perforated around the inner tube 41. The tubes 1 are arranged at substantially equal intervals in the circumferential direction of the tube 1. The drain material 42 is formed by bundling a plurality of tubes with a water-permeable material, and is arranged such that the length direction thereof faces the height direction. As the intubation 41, a PVC pipe, a corrugated pipe, or the like can be used.

  A mortar layer 43 is formed around the drain material 42. The mortar layer 43 is inserted into the leaking storage bag 44. When the mortar having fluidity is injected into the storage bag 44 before solidification, the storage bag 44 is expanded by the pressure of the mortar, and the drain material 42 is It is arranged in the surrounding position. Further, the drain member 42 and the storage bag 44 are integrated by a rubber band 45. An upper lid 46 is provided on the upper surfaces of the storage bag 44 and the drain material 42. The upper lid 46 is configured by injecting mortar into a flexible donut-shaped bag material.

  The formation procedure of the water conveyance material layer 40 which concerns on a 2nd form is as follows. First, the inner intubation tube 41 is inserted into the lower end side of the perforated tube 1. Next, the drain material 42 and the accommodation bag 44 are disposed between the perforated tube 1 and the inner tube 41. At this time, as shown in FIG. 8 (a), the drain material 42 is arranged at substantially equal intervals in the circumferential direction of the perforated tube 1, and the storage bag 44 is disposed between the drain materials 42 and the drain material 42. It arrange | positions between the intubation 41.

  Subsequently, mortar is injected into the storage bag 44. When the mortar is injected into the storage bag 44, the storage bag 44 expands, and as shown in FIG. 8 (b), the drain material 42 is pushed out by the rubber band 45 so as to be pushed out to the storage bag 44 at substantially equal intervals. Be placed. Here, the storage bag 44 filled with mortar is in a state of being disposed between the drain material 42 and the inner intubation 41 and between the drain materials 42. Then, the upper lid 46 is disposed above the accommodation bag 44. Thereafter, the water conduction material layer 40 is formed by solidifying the mortar.

  Thus, the water guide material layer 40 can be formed using the drain material 42. Further, in the water guiding material layer 40, when the accommodation bag 44 is filled with mortar, the drain material 42 is disposed on the outer surface of the water guiding material layer 40 due to the fluidity of the mortar. For this reason, since the drain material 42 can be arrange | positioned in the state which faced the natural ground, a high water-conductivity can be exhibited.

  Furthermore, the 3rd form of the water-conducting material layer provided in a perforated pipe is demonstrated. FIG. 9 is a perspective view showing a water guiding material layer according to the third embodiment. As shown in FIG. 9, the water guiding material layer 50 according to the third embodiment is formed by filling a permeable material 51 below the perforated pipe 1. As this water-permeable material 51, Monodren (registered trademark) or Hetimaron (registered trademark) similar to the water guide material layer 12 according to the first embodiment is used.

  In addition, the water guide material layer 50 includes an upper lid 52. The upper lid 52 can be a storage bag filled with mortar. Alternatively, a disk-shaped resin material or the like can be used. The upper lid 52 is disposed so as to cover the water-permeable material 51, and the filler 11 shown in FIG. Further, the outer side of the water-permeable material 51 is wrapped with a rubber band 53.

  In the water guide material layer 50 according to the third embodiment, the upper lid 52 is disposed at a position slightly below the center in the height direction of the perforated tube 1, and the water permeable material 51 wrapped with the rubber band 53 is disposed below the perforated tube 1. To fill. Thus, the water guiding material layer 50 is formed. After the water guide material layer 50 is formed, the filler 11 is filled above the water guide material layer 50 in the perforated pipe 1.

  At this time, since the inner pipes 21 and 41 are provided in the water guide material layers 12 and 40 in the above-described form, the filling pipe and the air vent pipe are inserted into the perforated pipe 1 through the inner pipes 21 and 41. Can be inserted. In addition, since the intubation pipe is not provided in the water guide material layer 50, when installing a filling pipe or an air vent pipe, a hole is made in the water guide material layer 12, and the filling pipe or the air vent pipe is inserted through the hole. Can be inserted.

  Or about a filler, there also exists a form inserted in the perforated pipe 1 from positions other than the drainage pipe connection part 4 in the downward direction of the perforated pipe 1, for example, performing slant boring from the ground of a creation ground, and filling the filler 11 It can also be filled. In this case, as shown in FIG. 10, a boring hole H inclined by oblique boring is formed up to the position reaching the perforated pipe 1, and the offset plate is shifted from the position where the groundwater collecting mass M is formed on the ground. The pump 33 is placed at the position.

  In this state, the filling tube is inserted into the bore hole H, the lateral component is leaked from the position shifted from the position where the porous tube 1 is formed, and the filling material is moved to the porous tube 1. Filling material 11 is filled. By forming such an oblique boring hole H, the filler 11 can be filled from a position other than the drain pipe connecting portion 4 side. Therefore, the porous material 1 can be easily filled into the perforated tube 1 even in the water guiding material layer 50 that does not include the inner tube. In addition, so-called bent boring in which a boring hole is formed by bending can be applied.

  On the other hand, as shown in FIG. 11, the storage bag 7 can also be used when the filler 11 is filled in the perforated tube 1. In this example, the filling material 11 is filled in the housing bag 7 to prevent the filling material 11 from leaking from the water-permeable holes formed in the side surface of the perforated pipe 1. The filling procedure of the filler according to this embodiment will be described. Before the water guide material layer 12 is formed, the accommodation bag 7 is set in the perforated tube 1 to form the water guide material layer 12. For this reason, the accommodation bag 7 will be in the state arrange | positioned above the water guide material layer 12. FIG.

  Subsequently, the filler 11 is filled into the perforated pipe 1 from the drain pipe connecting portion 4. By filling the filler 11, the storage bag 7 spreads along the inner surface of the perforated tube 1 due to the pressure of the filler 11. By using such a housing bag 7, it is possible to prevent the filler 11 from leaking from the water-permeable hole in the perforated pipe 1 to the water-permeable material layer 2.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, in the above embodiment, plastic grout, foamed urethane, or the like is used as the filler, but fluidized soil, mortar, air mortar, or the like can also be used. In particular, when the storage bag 7 is used as shown in FIG. 11, these fluidized soil, mortar, air mortar, and the like can be used effectively.

DESCRIPTION OF SYMBOLS 1 ... Perforated pipe 2 ... Water-permeable material layer 3 ... Lid member 4 ... Drain pipe connection part 5 ... Existing drain pipe 7 ... Storage bag 11 ... Filler 12, 40, 50 ... Water guide material layer 13 ... Water collecting member 14 ... Lead Water pipe 15 ... Drain pipe 21 ... Inner pipe 22 ... Water permeable material 23 ... Rubber band 31 ... Filling pipe 32 ... Air vent pipe 33 ... Pump 40 ... Water conducting material layer 41 ... Inner pipe 42 ... Drain material 43 ... Mortar layer 44 ... Storage bag 45 ... rubber band 46 ... upper lid 50 ... water-conducting material layer 51 ... permeable material 52 ... upper lid 53 ... rubber band G ... creation ground H ... boring hole L ... house M ... water collecting water W ... groundwater

Claims (8)

This is a method for backfilling a water collecting basin comprising a perforated pipe embedded in a vertical direction in a created ground, a permeable material layer formed around the perforated pipe, and connected to a drain pipe. And
While arranging a water guide material at the lower end of the perforated pipe to form a water guide material layer,
After forming a water channel between the water guide material layer and the drain pipe,
Filling the perforated pipe with a filler. A cylinder is installed at the bottom of the perforated tube,
The backfilling method of the collected water mass in the creation ground of Claim 1 which arrange | positions a water conveyance material between the said cylinder and the said perforated pipe, and forms a water conveyance material layer. Laying a small-diameter drain pipe smaller in diameter than the drain pipe in the drain pipe,
After connecting the small diameter drain pipe and the water channel,
The backfilling method of the dredged water collecting in the creation ground of Claim 1 or Claim 2 which fills the said drainage pipe with a filler.   The method for refilling dredged water collecting in the constructed ground according to any one of claims 1 to 3, wherein the water guide material layer is formed from the drain pipe side.   The backfilling processing method of the dredged water sump in the creation ground of any one of Claims 1-4 with which the said filler is filled from the said drain pipe side. When filling the filler, insert a filling pipe and an exhaust pipe from a lower opening of the perforated pipe,
The filling material is filled into the perforated pipe through the filling pipe, and air in the perforated pipe is discharged through an exhaust pipe. A method for backfilling dredged water collected in the ground. As the filling pipe and the exhaust pipe, a plurality of the filling pipes and the exhaust pipes having different lengths are inserted into the perforated pipe,
The method for refilling collected water in the constructed ground according to claim 6, wherein as the filling of the filler proceeds, the filling pipe and the exhaust pipe are filled with the filler. 5. The filling material according to claim 1, wherein the filling material is filled through a boring hole reaching the perforated pipe from an oblique position above the position where the perforated pipe is formed on the ground. Method of backfilling dredged water in the creation ground.

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