JP2018131754A - Drainage pipe, ground reinforcing structure and ground reinforcing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to fully demonstrate the drainage function and the adhesion strength with the ground.SOLUTION: A drainage pipe 10, at least a tip of which is inserted into the ground, comprises a drainage hole 13 opening in a side wall portion 12 of a main body 11, a recessed portion 14 formed in the side wall portion 12, and an inflatable bag body accommodated in the recessed portion 14. The bag body is accommodated in the recessed portion 14 so as not to project outward from an outer surface of the side wall portion 12 in the initial state.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a drain pipe, a ground reinforcing structure, and a ground reinforcing method.

  Conventionally, a plurality of drainage pipes have been inserted on the slopes of embankments and cuts on railways, roads, embankments and the like in order to prevent the ground from becoming unstable due to groundwater (see, for example, Patent Document 1). ). The drain pipe is a metal porous pipe having a large number of through holes formed in a cylindrical wall surface, and is inserted into the ground. Then, the moisture in the ground enters the drainage pipe through the through hole and is discharged to the outside from the end of the drainage pipe that opens to the slope of the embankment or cut. As a result, the pore water pressure in the ground can be reduced, and the slope can be prevented from collapsing during an earthquake or rainfall.

  In addition, a method for preventing collapse of the slope of embankment or cut by inserting a bar-shaped reinforcing material such as a metal bar into the ground is also known (see, for example, Patent Document 2). In this method, a rod-like reinforcing material is inserted into the ground, and a high fixing force is exhibited by filling and hardening a grout material, which is a kind of mortar, at the boundary between the rod-like reinforcing material and the ground. Thereby, the bar-shaped reinforcing member fixes the surface layer of the slope, and can prevent the slope from collapsing during an earthquake, rainfall, or the like. Such an effect is called a natural ground reinforcement effect.

JP 2014-173262 A Japanese Patent Laid-Open No. 2006-094783

  However, in the conventional technique, when the drain pipe is inserted into the ground, a sufficient ground reinforcement effect cannot be obtained. The drainage pipe is also a long and slender member like the rod-shaped reinforcement, so when inserted into the ground, it can fix the slope of the slope to some extent and exert the effect of preventing the slope from collapsing. Although expected, the boundary between the drain pipe and the ground was not solidified by the grout material, so the adhesion to the ground was not sufficient. In addition, if the grout material is filled and hardened at the boundary between the periphery of the drain pipe and the ground, a large number of through holes formed in the cylindrical wall surface of the drain pipe are blocked by the grout material. It becomes impossible to demonstrate.

  Here, the drainage pipe that can solve the problems of the conventional technology and can sufficiently exert the drainage function and can sufficiently exert the fixing force with the ground, and the drainage pipe An object of the present invention is to provide a ground reinforcing structure and a ground reinforcing method using the slab.

  Therefore, in the drainage pipe, at least the tip is a drainage pipe inserted into the ground, the drainage hole opened in the side wall portion of the main body, the recess portion formed in the side wall portion, and accommodated in the recess portion The inflatable bag is housed in the recess so as not to protrude outward from the outer surface of the side wall in the initial state.

  In another drainage pipe, the bag body further includes a check valve unit communicating with the inside of the main body, and the check valve unit allows the flow of the filler from the inside of the main body into the bag body. Then, the flow of the filler from the bag body to the inside of the main body is prohibited.

  In still another drainage pipe, a plurality of the recessed portions are arranged at intervals in the circumferential direction of the side wall portion, and the depth of the recessed portion is a dimension that allows water to flow inside the main body.

  In yet another drainage pipe, the bag body further expands when it is filled with a filler, and projects outward from the outer surface of the side wall portion.

  In the ground reinforcement structure, the ground reinforcement structure is provided with a drain pipe having at least a tip inserted into the ground, the drain pipe including a drain hole opening in a side wall portion of the main body and a recess formed in the side wall portion. And an inflatable bag housed in the recess, the bag body is inflated by being filled with a filler, protrudes outward from the outer surface of the side wall, and enters the surrounding ground. ing.

  In another ground reinforcement structure, a pressure receiving plate is further attached to the boundary between the vicinity of the rear end of the main body and the slope of the ground.

  In the ground reinforcement method, a drainage hole that opens to the side wall portion of the main body, a dent portion formed in the side wall portion, and an inflatable bag body accommodated in the dent portion, which is more than the outer surface of the side wall portion. A step of inserting at least a tip of a drain pipe including a bag body accommodated in the recess so as not to protrude outwardly into the ground, and a filling material is filled into the bag body from the inside of the main body, and the bag body And inflating the outer wall to protrude outward from the outer surface of the side wall to enter the surrounding ground.

  In another ground reinforcement method, further, a filler supply device including a pair of sealing bag bodies is inserted inside the main body, each sealing bag body is inflated to be in close contact with the inner surface of the side wall, A filler is filled between the pair of sealing bag bodies inside the main body, and the bag is filled with the filler.

  According to the present disclosure, the drainage pipe can sufficiently exhibit the drainage function and can sufficiently exhibit the fixing force with the ground.

It is a side view of the drainage pipe in this Embodiment. It is a cross-sectional view of the drain pipe in the present embodiment. It is a side view which shows the state which mounted | wore the drainage pipe in this Embodiment with the bag body. It is a cross-sectional view which shows the state which mounted | wore the drainage pipe in this Embodiment with the bag body. It is a cross-sectional view of the ground showing a method for inserting a drain pipe into the ground in the present embodiment. It is a sectional side view which shows the state which inserted the filler supply apparatus in the drainage pipe in this Embodiment. It is a sectional side view which shows the state which expanded the sealing member of the filler supply apparatus inserted in the drain pipe in this Embodiment. It is a sectional side view which shows the state which supplies a filler from the filler supply apparatus inserted in the drain pipe in this Embodiment. It is a sectional side view which shows the state which discharges a filler supply apparatus from the drain pipe in this Embodiment. It is a transverse cross section of the ground which shows the state where insertion to the ground of a drain pipe in this embodiment was completed.

  Hereinafter, the present embodiment will be described in detail with reference to the drawings.

  1 is a side view of a drain pipe in the present embodiment, FIG. 2 is a cross-sectional view of the drain pipe in the present embodiment, and FIG. 3 is a side view showing a state in which a bag is attached to the drain pipe in the present embodiment. 4 is a cross-sectional view showing a state in which a bag body is mounted on the drainage pipe in the present embodiment, and FIG. 5 is a cross-sectional view of the ground showing a method for inserting the drainage pipe into the ground in the present embodiment. 2A is a cross-sectional view taken along the line AA in FIG. 1, FIG. 2B is a cross-sectional view taken along the line BB in FIG. 1, and FIG. 4A is a cross-sectional view taken along the line A in FIG. -A arrow sectional drawing, (b) is the AA arrow sectional drawing of the state in which the bag body was expanded.

  In the figure, reference numeral 10 denotes a drain pipe in the present embodiment, which is preferably used to prevent ground instability due to the rise of groundwater and to reinforce the ground, at least at the tip of the drain pipe. Inserted. For example, as shown in FIG. 5, it is inserted into the slope 33 of the embankment 31 as the ground constructed on the original ground 32 and used from the outside in the direction indicated by the arrow C. In addition, the ground into which the drainage pipe 10 is inserted in the present embodiment does not necessarily need to be the embankment 31, and may be cut, for example, but here, for the convenience of explanation, the embankment 31. Will be described. Further, the embankment 31 may be used for railways, roads, river dikes, or any use. It will be described as being. Further, the place where the drain pipe 10 is inserted may be any place on the ground, but here, it will be described as the slope 33 of the embankment 31. Furthermore, the direction in which the drain pipe 10 is inserted may be any direction, but here, the water in the embankment 31 is more likely to flow out to the outside due to gravity, rather than horizontal as indicated by the arrow C. The description will be made assuming that the tape is inserted obliquely upward.

  In the present embodiment, expressions indicating directions such as upper, lower, left, right, front, rear and the like used for explaining the configuration and operation of each part of the drainage pipe 10 and other members are absolute. It is not relative, but is relative, and is appropriate when each part of the drainage pipe 10 and other members are in the posture shown in the figure, but when the posture changes, depending on the change in posture It should be interpreted and changed.

  As shown in FIG. 1, the drain pipe 10 includes an elongated hollow cylindrical main body 11 extending linearly. The main body 11 may be made of any material, but is preferably made of, for example, steel in consideration of strength and the like. The dimensions of the main body 11 can be determined as appropriate. Here, the description will be made assuming that the outer diameter is about 6 [cm] and the length is 2 to 3 [m].

  The front end 11f of the main body 11 is processed into a shape like a sharp blade so that the insertion resistance is small and smoothly inserted when inserted into the embankment 31 in the direction indicated by the arrow C. In the example shown in FIG. 1, the front end 11f is linearly closed by crushing the cylindrical side wall portion 12 of the main body 11 from both sides, and a portion near the front end 11f is inclined toward the front end 11f. It is the processing part 11a processed so that it might become a pair of slope. The front end 11f of the main body 11 does not necessarily have a shape like a sharp blade. For example, the front end 11f may be a cone or a pyramid, is sharp, has a low insertion resistance, and has an earth 16 inside. Any shape may be used as long as the shape is closed so as not to enter.

  On the other hand, the main body 11 is opened while maintaining a cylindrical shape at the rear end 11r. As a result, as shown in FIG. 5, moisture can be discharged to the outside from the rear end 11 r located outside the slope 33 of the embankment 31. In addition, when the length of the main body 11 is not sufficiently long, if a screw is formed on the outer surface or the inner surface of the side wall portion 12 at the rear end 11r, another pipe (not shown) is screwed to become a necessary length. It can be extended as follows.

  A plurality of elongated slit-shaped drain holes 13 extending in the axial direction of the main body 11 are formed in the side wall portion 12. As shown in FIG. 2 (b), the drain hole 13 is an opening that penetrates the side wall portion 12 in the plate thickness direction and communicates the outside of the main body 11 and the inside 16. It is an opening that allows moisture in the embankment 31 to enter the interior 16 when inserted into the interior. In the example shown in the figure, the drain holes 13 are arranged two by two at equal intervals in the circumferential direction (circumferential direction) of the side wall portion 12, and at a predetermined interval over almost the entire length of the main body 11 in the axial direction. Although arrange | positioned side by side, the number and arrangement | positioning aspect of the said drain hole 13 are not limited to this, It can change suitably. It is desirable that the drain hole 13 is not located at the lowermost portion of the side wall portion 12 that becomes the bottom surface of the flow path of moisture that has entered the interior 16.

  Further, a plurality of recessed portions 14 are formed at a location near the front end 11 f in the side wall portion 12. As shown in FIG. 2A, the recess 14 is a recess that is plastically deformed by pressing the cylindrical side wall 12 toward the center of the cylinder with a press machine or the like. As shown in (a), the bag body 21 can be accommodated therein. And the communicating hole 15 which penetrates the side wall part 12 in the plate | board thickness direction and connects with the inside 16 is formed in the bottom part of each recessed part 14 so that the non-return valve unit 22 of the bag body 21 can pass. ing.

  The size and shape of each recess 14 can be appropriately determined so that the bag body 21 that is still contracted does not protrude, but here, the dimension L in the axial direction of the main body 11 is set at the side wall 12. The description will be made assuming that the shape is an ellipse or an ellipse having a size W of about 10 [cm] and a circumferential dimension W of about 4 [cm]. Further, as shown in FIG. 4A, the depth of each recess 14 is the initial state, that is, the state before the filling material 23 is filled, and the bag body 21 that is still contracted is The bag body 21 is formed in a size that can be accommodated so as not to protrude outward from the cylindrical surface that is the outer surface of the side wall portion 12. Thereby, when the drainage pipe 10 is inserted into the embankment 31, since the bag body 21 does not interfere with the surrounding embankment 31, it does not become insertion resistance and is not damaged.

  Furthermore, although the said recessed part 14 is arrange | positioned at equal intervals by the circumferential direction of the side wall part 12 (in the example shown by a figure, four), as FIG. 2 (a) shows, It is formed to a depth or size that can secure a sufficient cross-sectional area of the interior 16 to function as a flow path. The recess 14 is preferably not located at the lowermost portion of the side wall 12 serving as the bottom of the flow path of moisture that has entered the interior 16. Further, the recess 14 is not necessarily formed at a location near the front end 11f in the axial direction of the main body 11, and can be formed not only at one location but also at a plurality of locations. For the sake of convenience, as shown in the figure, an example formed only at one location near the front end 11f will be described.

  Then, after the drainage pipe 10 is inserted into the embankment 31, the bag 23 is filled with the filler 23 through the check valve unit 22. As a result, the bag body 21 expands as shown in FIG. 4B and protrudes outside the cylindrical surface of the side wall portion 12 to interfere with the surrounding embankment 31. It functions as an anchor for increasing the fixing force between the embankment 31 and preventing the drainage pipe 10 from coming out of the embankment 31. The check valve unit 22 allows a flow of the filler 23 from the outside to the inside of the bag body 21, while prohibiting a flow of the filler 23 from the inside of the bag body 21 to the outside (reverse valve). Therefore, the inflated bag body 21 does not contract.

  The filling material 23 may be made of any kind of material, but has sufficient fluidity when filled into the bag body 21 such as cement milk, and then solidifies. It is desirable to be a solidifying material. Here, the filler 23 will be described as a grout material which is a kind of mortar. The bag body 21 may be of any kind as long as it has a flexible bag shape. Here, it is referred to as a commercially available packer for use in civil engineering work. It is assumed that only moisture contained in the filling material 23 filled inside oozes out from the surface of the bag body 21 to the outside.

  Next, a method for reinforcing the embankment 31 using the drainage pipe 10 having the above configuration will be described.

  FIG. 6 is a side sectional view showing a state in which the filler supply device is inserted into the drain pipe in the present embodiment, and FIG. 7 is an enlarged view of the sealing member of the filler supply device inserted in the drain pipe in the present embodiment. FIG. 8 is a side sectional view showing a state in which the filler is supplied from the filler supply device inserted in the drain pipe in the present embodiment, and FIG. 9 is a diagram from the drain pipe in the present embodiment. FIG. 10 is a cross-sectional side view of the ground showing a state where the drainage pipe is inserted into the ground in the present embodiment.

  First, as shown in FIGS. 3 and 4 (a), the drainage pipe 10 to which the bag body 21 is attached is made of the embankment 31 as the ground constructed on the original ground 32 as shown in FIG. Insert from the slope 33 in the direction indicated by arrow C. In this case, since the front end 11 f of the main body 11 of the drain pipe 10 has a sharp and closed shape, the insertion resistance is small and the insert 11 is smoothly inserted into the embankment 31, and the soil does not enter the interior 16. Further, as described above, the bag body 21 is in the initial contracted state and is accommodated in the recessed portion 14 so as not to protrude outward from the cylindrical surface of the side wall portion 12. It does not interfere with the embankment 31 and does not cause insertion resistance and is not damaged.

Subsequently, when the predetermined length of the drain pipe 10 is inserted into the embankment 31, the insertion operation is stopped. Then, as shown in FIG. 6, the filler supply device 40 is inserted from the rear end 11 r of the main body 11 of the drain pipe 10, and is advanced in the interior 16 of the main body 11 as indicated by an arrow D. The filler supply device 40 is similar to a device used in a double packer method (for example, see Patent Document 3) which is a kind of work for injecting a drug into the ground.
JP 2004-316394 A

  As shown in FIG. 6, the filler supply device 40 includes a supply pipe 41, a front sealing bag body 42f attached near the front end of the supply pipe 41, and a rear side of the front sealing bag body 42f. An attached rear sealing bag body 42r and a water guide tube 43 connected to the rear sealing bag body 42r are provided. The water guide tube 43 includes an intermediate water guide tube 43a that connects the rear sealing bag body 42r and the front sealing bag body 42f. A filler discharge port 41a is formed on the wall surface of the supply pipe 41 between the rear sealing bag body 42r and the front sealing bag body 42f. In addition, when describing the said front sealing bag body 42f and the back sealing bag body 42r integrally, it demonstrates as the sealing bag body 42. FIG.

  And as FIG. 6 shows, the front sealing bag body 42f and the back sealing bag body 42r were each located in the front and back of the dent part 14 in which the bag body 21 is accommodated regarding the axial direction of the main body 11. Then, the filler supply device 40 is stopped.

  Subsequently, as indicated by an arrow E in FIG. 7, water is injected into the rear sealing bag body 42 r from the rear of the drain pipe 10 through the water guide tube 43. The water injected into the rear sealing bag body 42r is also injected into the front sealing bag body 42f through the intermediate water guide tube 43a. Accordingly, as shown in FIG. 7, the front sealing bag body 42 f and the rear sealing bag body 42 r expand and are pressed against and adhered to the cylindrical inner surface of the side wall portion 12. Therefore, a portion where the front sealing bag body 42f and the rear sealing bag body 42r and the cylindrical inner surface of the side wall portion 12 are sealed in a liquid-tight manner, and the recess portion 14 is formed in the inside 16 of the main body 11. It is cut off from the front and back.

  Subsequently, as indicated by an arrow F in FIG. 8, the filler 23 is injected at a predetermined pressure through the supply pipe 41 from the rear of the drainage pipe 10 into the portion where the recess 14 is formed in the interior 16 of the main body 11. . The filler 23 is discharged from a filler discharge port 41a formed on the wall surface of the supply pipe 41 between the front sealing bag body 42f and the rear sealing bag body 42r. In this case, since the space between the front sealing bag body 42f and the rear sealing bag body 42r and the cylindrical inner surface of the side wall portion 12 is liquid-tightly sealed, the filler 23 is formed in the interior 16 of the main body 11. It fills only in the location in which the dent part 14 was formed, and it does not leak to the location before and behind that. Then, when the filler 23 fills the portion where the recess 14 is formed in the inside 16 of the main body 11, the filler 23 flows into the bag body 21 via the check valve unit 22.

  Then, the bag body 21 expands as shown in FIG. In this case, since the pressure of the filler 23 flowing into the bag body 21 is high, the bag body 21 expands by pushing away the surrounding embankment 31 and protrudes outward from the cylindrical surface of the side wall portion 12. As a result, the bag body 21 inflated by the filler 23 filled inside protrudes outward at four locations in the circumferential direction of the side wall portion 12 and enters the surrounding embankment 31 to interfere with the embankment 31. The fixing force between the pipe 10 and the embankment 31 is increased, and the drainage pipe 10 is prevented from coming out of the embankment 31.

  Subsequently, as indicated by an arrow G in FIG. 9, water is discharged from the inside of the front sealing bag body 42 f and the rear sealing bag body 42 r to the rear of the drain pipe 10 through the water guide tube 43. Thereby, the front sealing bag body 42f and the rear sealing bag body 42r are contracted and separated from the cylindrical inner surface of the side wall portion 12.

  Subsequently, as indicated by an arrow H in FIG. 9, the filler supply device 40 is retracted and taken out from the rear end 11 r of the main body 11 to the rear of the drain pipe 10. At this time, a certain amount of the filler 23 remains in the inside 16 of the main body 11, but the filler 23 is not solidified and has fluidity. For example, by spraying high-pressure water. It can be removed from the inside 16 of the main body 11 and discharged from the rear of the drain pipe 10 to the outside. Moreover, since the filling material 23 filled in the bag body 21 is prevented from flowing out of the bag body 21 by the check valve unit 22, the expanded bag body 21 contracts. There is no.

  Subsequently, as shown in FIG. 10, the pressure receiving plate 18 is attached to the boundary between the vicinity of the rear end 11 r of the main body 11 of the drainage pipe 10 projecting outward from the embankment 31 and the slope 33 of the embankment 31. The pressure receiving plate 18 is a flat plate or mesh member made of reinforced concrete, steel, resin, etc., and is a member used in a general ground-mount reinforced earth method. Prevent it. Then, when the filling material 23 filled in the bag body 21 is solidified after a predetermined period (for example, several days), the insertion of the drain pipe 10 into the embankment 31 is completed, and the embankment 31 is reinforced. Specifically, as shown in FIG. 10, since the inflated bag body 21 enters the surrounding embankment 31, the drain pipe 10 is prevented from coming out of the embankment 31, and moisture in the embankment 31 is removed. Since the water enters the inside 16 of the main body 11 through the drain hole 13 formed in the side wall portion 12 and is discharged from the rear end 11r of the main body 11 protruding outward from the embankment 31, the pore water pressure in the embankment 31 is reduced. This prevents the slope 33 from collapsing. In addition, also in the location where the dent part 14 in which the bag body 21 is accommodated is formed, a sufficient space is secured in the inside 16 of the main body 11 to function as a moisture flow path. Water entering from the drain hole 13 formed on the front end 11 f side of the main body 11 with respect to 14 is also reliably discharged.

  Thus, in the present embodiment, at least the tip of the drain pipe 10 is inserted into the embankment 31. The drainage pipe 10 includes a drainage hole 13 opening in the side wall portion 12 of the main body 11, a recess portion 14 formed in the side wall portion 12, and an inflatable bag body 21 accommodated in the recess portion 14. In the initial state, the bag body 21 is accommodated in the recessed portion 14 so as not to protrude outward from the outer surface of the side wall portion 12. Thereby, when the drainage pipe 10 is inserted into the embankment 31, the bag body 21 is not damaged, the drainage function can be sufficiently exhibited, and the fixing force with the embankment 31 can be sufficiently exhibited. can do.

  Further, the bag body 21 has a check valve unit 22 communicating with the inside 16 of the main body 11, and the check valve unit 22 allows the flow of the filler 23 from the inside 16 of the main body 11 into the bag body 21. The flow of the filler 23 from the inside of the bag body 21 to the inside 16 of the main body 11 is prohibited. Therefore, the filler 23 does not flow out of the bag body 21.

  Further, a plurality of the recessed portions 14 are arranged at intervals in the circumferential direction of the side wall portion 12, and the depth of the recessed portions 14 is a dimension that allows water to flow through the inside 16 of the main body 11. Therefore, the cross-sectional area of the interior 16 sufficient to function as a moisture flow path is ensured.

  Furthermore, the bag body 21 expands when the filling material 23 is filled, and protrudes outward from the outer surface of the side wall portion 12. Thereby, the bag body 21 interferes with the embankment 31, increases the fixing force between the drainage pipe 10 and the embankment 31, and functions as an anchor for preventing the drainage pipe 10 from coming out of the embankment 31.

  In the present embodiment, the ground reinforcing structure includes the drainage pipe 10 having at least a tip inserted into the embankment 31. The drain pipe 10 includes a drain hole 13 that opens to the side wall 12 of the main body 11, a recess 14 formed in the side wall 12, and an inflatable bag body 21 accommodated in the recess 14. The bag body 21 is filled with the filler 23 and expands, protrudes outward from the outer surface of the side wall portion 12, and enters the surrounding embankment 31. Thereby, the drainage pipe 10 can fully exhibit the drainage function and can sufficiently exhibit the fixing force between the embankment 31 and the embankment 31 that is the ground is effectively reinforced.

  Further, a pressure receiving plate 18 is mounted at the boundary between the vicinity of the rear end of the main body 11 and the slope 33 of the embankment 31. Therefore, the movement of the surface layer ground is effectively prevented.

  Furthermore, in the present embodiment, the ground reinforcement method is a drainage hole 13 that opens in the side wall portion 12 of the main body 11, a recess portion 14 formed in the side wall portion 12, and an inflatable that is accommodated in the recess portion 14. Inserting at least the distal end of the drainage pipe 10 into the embankment 31 including the bag body 21 and the bag body 21 housed in the recessed portion 14 so as not to protrude outward from the outer surface of the side wall portion 12; Filling the bag body 21 with the filler 23 from the inside 16 of the main body 11, expanding the bag body 21 to protrude outward from the outer surface of the side wall portion 12, and entering the surrounding embankment 31. . Thereby, while being able to insert the drain pipe 10 easily, the embankment 31 which is the ground can be effectively reinforced.

  Further, a filler supply device 40 including a pair of sealing bag bodies 42 is inserted into the inside 16 of the main body 11, and each sealing bag body 42 is inflated and brought into close contact with the inner surface of the side wall portion 12. The filling material 23 is filled between the pair of sealing bag bodies 42, and the bag material 21 is filled with the filling material 23. Thereby, the bag body 21 can be easily inflated.

  It should be noted that the disclosure of the present specification describes features related to preferred and exemplary embodiments. Various other embodiments, modifications and variations within the scope and spirit of the claims attached hereto can naturally be conceived by those skilled in the art by reviewing the disclosure of this specification. is there.

  The present disclosure can be applied to a drain pipe, a ground reinforcing structure, and a ground reinforcing method.

DESCRIPTION OF SYMBOLS 10 Drain pipe 11 Main body 12 Side wall part 13 Drain hole 14 Recessed part 16 Inside 18 Pressure receiving plate 21 Bag body 22 Check valve unit 23 Filler 31 Filling 33 Slope 40 Filler supply device 42 Sealing bag body 42f Front sealing bag Body 42r rear sealing bag body

Claims (8)

A drain pipe with at least a tip inserted into the ground,
A drainage hole opening in the side wall of the main body,
A recess formed in the side wall,
An inflatable bag housed in the recess,
In the initial state, the bag body is accommodated in the recess so as not to protrude outward from the outer surface of the side wall.   The bag body has a check valve unit communicating with the inside of the main body, and the check valve unit allows a filler to flow from the inside of the main body into the bag body, and from the bag body to the inside of the main body. The drainage pipe according to claim 1, wherein the flow of the filler to the water is prohibited.   The drain pipe according to claim 1 or 2, wherein a plurality of the recessed portions are arranged at intervals in the circumferential direction of the side wall portion, and the depth of the recessed portion is a dimension that allows moisture to flow inside the main body.   The drainage pipe according to any one of claims 1 to 3, wherein the bag body expands when the filler is filled and projects outward from the outer surface of the side wall portion. A ground reinforcement structure having a drain pipe inserted at least at the tip into the ground,
The drainage pipe includes a drainage hole that opens in a side wall portion of the main body, a recess formed in the side wall, and an inflatable bag housed in the recess,
The ground reinforcing structure, wherein the bag body is filled with a filler, expands, protrudes outward from the outer surface of the side wall portion, and enters the surrounding ground.   The ground reinforcement structure according to claim 5, wherein a pressure receiving plate is attached to a boundary between a vicinity of a rear end of the main body and a slope of the ground. A drainage hole that opens in the side wall of the main body, a recess formed in the side wall, and an inflatable bag housed in the recess so as not to protrude outward from the outer surface of the side wall. Inserting at least the tip of a drainage pipe including a bag housed in the recess into the ground;
Filling the bag body from the inside of the main body, inflating the bag body and projecting outward from the outer surface of the side wall, and entering the surrounding ground;
The ground reinforcement method characterized by including.   Inserting a filler supply device including a pair of sealing bag bodies into the inside of the main body, inflating each sealing bag body and bringing it into intimate contact with the inner surface of the side wall portion, and a pair of sealing bag bodies inside the main body The ground reinforcing method according to claim 7, wherein a filling material is filled in between and the bag is filled with the filling material.

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