JP2005179896A - Water collecting/draining member, and forming method for water collecting/draining hole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a water collecting/draining hole by a simple method, and to surely prevent the water collecting/draining hole from being closed with earth pressure. <P>SOLUTION: A water collecting/draining member 1 comprises: a water collecting/draining jacket 2 which includes a tubular woven fabric 4 with water permeability, and a hollow and flexible shape maintaining member 5 mounted outside the tubular fabric 4 and having a fluid solidification material injected internally; and a tubular member 3 for covering the outside of the jacket 2. The member 1 is inserted into an excavated hole while being turned upside down, and the inside tubular member 3 is removed after the injection of the fluid solidification material into the member 5, so that the water collecting/draining hole 5 can be formed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a drainage member for forming drainage holes in the ground such as mountains and a method for forming the drainage holes.

  In particular, in mountainous areas, landslides are likely to occur when the underground water pressure in the ground is excessively high, such as during rainfall. As shown in FIG. 13, an upper layer 101 such as andesite is generally formed on a mountain base 100 made of tuff or the like. Here, the base portion 100 such as tuff hardly contains water, but the upper layer portion 101 made of andesite tends to contain water when weathered. Therefore, in the state where the upper layer part 101 contains water at the time of rainfall or the like, the ground water pressure of the upper layer part 101 rises and a pressure difference is generated at the interface 102 between the base part 100 and the upper product part 101. Landslide is likely to occur. As one method for preventing this landslide, for example, a plurality of drainage holes are excavated from a slope of a mountain, and the underground water pressure is reduced by draining underground water from the plurality of drainage holes. There is a way.

  However, since the ground where such drainage holes are formed is often soft ground with a lot of moisture, the drainage holes formed in the ground are crushed by earth pressure, and the drainage holes are blocked. There is a risk that sufficient drainage of the underground will not be possible. Therefore, as shown in FIG. 13, the drainage pipe 103 having a plurality of drainage holes is pushed into the ground from the slope of the mountain, and the underground water is discharged from the ground through the drainage pipe 103. Water draining methods have been proposed (see, for example, Patent Documents 1 and 2).

Japanese Patent Publication No. 5-17333 Japanese Patent Laid-Open No. 7-82751

  However, in the method of draining from the ground as described in Patent Documents 1 and 2, the drain pipe of a predetermined length is sequentially pushed into the slope of the mountain and the drain pipe is laid in the ground. However, at this time, it is necessary to alternately perform the process of pushing the drain pipe of a predetermined length and the process of connecting the next drain pipe to the pushed drain pipe, and the workability is poor. In addition, since the drain pipe to be pushed in is inevitably long and rigid, it takes time to transport the drain pipe to the construction site, and it is wide around the construction site to store multiple drain pipes. Space is required.

  An object of the present invention is to form a drainage hole by a simple method and to reliably prevent the drainage hole from being blocked by earth pressure.

Means for Solving the Problems and Effects of the Invention

  A water collecting and draining member according to a first aspect of the present invention is a cylindrical woven fabric having water permeability, and a hollow and flexible shape holding member that is attached to the outside of the cylindrical woven fabric, and has a fluidized solidifying material therein. And a tube-shaped member covering the outside of the drainage jacket.

  The drainage jacket is inserted into the excavation hole formed in the ground and supports the excavation hole from the inside against the earth pressure, and the inner surface of the excavation hole is covered with the drainage jacket to collect and drain the water. A hole is formed. The water in the ground is discharged through a cylindrical woven fabric having water permeability, while a solidifying material such as mortar is injected into the shape maintaining member and solidified. In this state where the fluidized solidified material is solidified, the shape retaining member ensures strength against earth pressure, so that the drainage hole can be prevented from being crushed by earth pressure.

  Further, the outside of the collection and drainage jacket is covered with a tubular member. This tubular member is formed of a flexible material such as a synthetic rubber or a plastic tube. And since the outer surface of a drainage jacket (especially the cylindrical woven fabric which has water permeability) is protected by a tube-shaped member, the outer surface of a drainage jacket will be damaged at the time of transportation and storage of a drainage member. Can be prevented. Furthermore, when inserting the drainage member into the drainage hole, insert the drainage member that is stacked in the order of the tubular woven fabric, the shape retaining member, and the tubular member from the inside into the excavation hole. For example, the tubular woven fabric having water permeability can be positioned on the outermost side, and the tubular woven fabric is in direct contact with the inner surface of the excavation hole, thereby improving the drainage performance. Further, since the tubular member is located on the innermost side, it becomes easy to remove the tubular member after the collection and drainage jacket is disposed in the excavation hole.

  In addition, the drainage member having the tubular woven fabric, the shape holding member, and the tube-like member has flexibility, so that it can be wound around a reel and transported or stored, thereby improving workability. The storage space is small.

  According to a second aspect of the present invention, the drainage member according to the first aspect is characterized in that the shape maintaining member communicates with the backbone portion extending in the longitudinal direction of the tubular woven fabric and the backbone portion, and is orthogonal to the longitudinal direction. And a plurality of annular portions provided in the spine portion at predetermined intervals in the longitudinal direction. Accordingly, the fluidizable solidifying material can be injected at once from the spine portion into the plurality of annular portions. In addition, the plurality of annular portions are parallel to a plane orthogonal to the longitudinal direction of the tubular woven fabric (longitudinal direction of the underground excavation hole), and the solidified state is obtained by injecting a fluidized solidifying material into the plurality of annular portions. Then, since the intensity | strength with respect to earth pressure is ensured by these some cyclic | annular parts, it can prevent reliably that a drainage hole is crushed by earth pressure. Further, since the plurality of annular portions are provided at predetermined intervals in the longitudinal direction, water in the ground can flow into the drainage hole from between the annular portions, thereby ensuring sufficient drainage performance. can do.

  In the second invention, the drainage member according to the third invention is characterized in that the spine portion and the plurality of annular portions are woven fabrics having water permeability. Therefore, when a cement-based solidifying material such as mortar is used as the fluidized solidifying material, the water in the fluidized solidifying material can be discharged out of the shape holding member. In addition, the water in the ground can slightly flow into the collection / drainage jacket from the shape holding member, and the collection / drainage performance is improved.

  According to a fourth aspect of the present invention, there is provided a method for forming a drainage hole, a first step of forming an excavation hole in the ground, a cylindrical woven fabric having water permeability, and a hollow and flexible attached to the outside of the cylindrical woven fabric. The drainage jacket including the drainage jacket including the shape holding member and the tubular member covering the outside of the drainage jacket is overlapped in the order of the tubular member, the shape holding member, and the cylindrical woven fabric from the inside. A second step of inserting into the excavation hole while turning over so as to be in a state; a third step of injecting and solidifying a fluidized solidifying material into the shape holding member; and only the tubular member located on the innermost side And a fourth step of removing from the excavation hole.

  First, in the first step, an excavation hole is formed in the ground using an excavator. Next, in the second step, the drainage member is inserted into the excavation hole. Here, in the state before the insertion, the tubular drainage member in a state where the tubular woven fabric, the shape holding member, and the tubular member overlap in that order from the inside, Insert it into the excavation hole while turning it over so that it will overlap in order. Therefore, before insertion, the outer surface of the water-permeable tubular woven fabric is protected by the tubular member, and the outer surface of the tubular woven fabric is prevented from being damaged during transportation and storage. In addition, the frictional resistance does not occur between the inner surface of the excavation hole and the drainage member as in the case where the drainage member is pushed into the excavation hole and inserted, and the insertion operation can be easily performed. Furthermore, since the tubular woven fabric is positioned on the outermost side when inserted into the excavation hole, the tubular woven fabric is in close contact with the inner surface of the excavation hole, and the drainage performance is improved.

  And in a 3rd process, a fluid solidification material is inject | poured in a shape holding member. As this fluid solidifying material, various solidifying materials such as cement-based solidifying materials such as mortar and cement milk, and synthetic resin-based solidifying materials such as thermosetting resins can be used. Here, a pressurized fluid such as pressurized air is previously injected into the inner tubular member, and the tubular woven fabric positioned outside the shape holding member is in close contact with the inner surface of the excavation hole. It is preferable to inject a fluidized solidifying material into the holding member. Finally, in the fourth step, the innermost tube-shaped member is removed from the excavation hole, and the inner surface of the excavation hole is covered with the drainage jacket so that the drainage hole is formed in the ground. To complete.

  According to this method of forming a drainage hole, the strength against earth pressure can be secured by the shape holding member by injecting and solidifying the fluidized solidifying material into the shape holding member of the drainage jacket, and the drainage hole is crushed. Can be prevented from being blocked. Further, since the flexible drainage member is continuously inserted into the excavation hole while turning over, the drainage member can be easily installed in the excavation hole, and the process can be simplified. Moreover, when the drainage member is inserted into the excavation hole, the cylindrical woven fabric having water permeability is positioned on the outermost side and closely contacts the inner surface of the excavation hole, so that the drainage performance is improved and the drainage jacket is protected. Since the tubular member that has been used is located on the innermost side, it is easy to remove the tubular member from the excavation hole.

  According to a fifth aspect of the present invention, in the fourth aspect of the invention, in the fourth step, in the fourth step, the tubular member is removed from the drainage hole while turning over again. Therefore, since the tube-shaped member once turned over is reversed and turned back again, the tube-shaped member can be removed from the excavation hole while being peeled off from the shape holding member, so that the operation is easy.

  Embodiments of the present invention will be described. The present embodiment is an example in which the present invention is applied to the case where a drainage hole for collecting and draining underground water from a slope of a mountain is formed.

  First, the drainage member 1 that is inserted into an excavation hole formed in the ground and covers the inner surface of the excavation hole will be described. As shown in FIG. 1, the drainage member 1 includes a drainage jacket 2 that supports the excavation hole 14 from the inside in the excavation hole 14 (see FIGS. 5 to 12), and a tube that covers the outer side of the drainage jacket 2. And a shaped member 3.

  The drainage jacket 2 includes a cylindrical woven fabric 4 having water permeability, and a shape holding member 5 which is provided outside the cylindrical woven fabric 4 and is hollow and has flexibility. Here, the tubular woven fabric 4 is a seamless woven fabric woven with synthetic fibers such as polyester, and has flexibility.

  The shape holding member 5 is fixed by sewing, joining, or the like so as not to move relative to the tubular woven fabric 4 in the longitudinal direction. The shape maintaining member 5 is connected to the backbone 5a extending in the longitudinal direction of the tubular woven fabric 4 and the backbone 5a, and is parallel to a plane perpendicular to the longitudinal direction and spaced apart from the longitudinal direction by a predetermined distance. And a plurality of annular portions 5b provided in the spine portion 5a.

  Then, with the drainage jacket 2 inserted into the underground excavation hole 14, as shown in FIG. 2, from one end of the spine portion 5a, the spine portion 5a and a plurality of annular portions 5b communicating with the spine portion 5a are provided. A fluidized solidifying material such as cement is injected and solidified into the inside of the drilling hole, and the inner surface of the excavation hole 14 is supported by the shape holding member 5. Here, if the shape-retaining member 5 is formed of a material having water permeability such as a woven fabric woven with synthetic fiber yarn, when a cement-based solidifying material such as mortar is used as the flowable solidifying material, The moisture in the property solidifying material can be discharged out of the shape holding member. In addition, the water in the ground can slightly flow into the collection / drainage jacket from the shape holding member, and the collection / drainage performance is improved.

  The tubular member 3 is formed of a material having flexibility and airtightness such as synthetic rubber. And as shown in FIG. 1, the above-mentioned collection / drainage jacket 2 is inserted into the inside of the tubular member 3. Therefore, in the state before being inserted into the excavation hole 14, the drainage / drainage member 1 is configured in a state in which the tubular woven fabric 4, the shape holding member 5, and the tubular member 3 are overlapped in this order from the inside. Since the woven fabric 4 is covered and protected by the tubular member 3, it is possible to prevent the outer surface of the tubular woven fabric 4 from being damaged during transportation and storage of the drainage / drainage member 1. As will be described later, when the drainage / drainage member 1 is inserted into the excavation hole 14, the drainage / drainage member 1 is arranged in the order of the tubular member 3, the shape retaining member 5, and the tubular woven fabric 4 from the inside. It is turned over (see FIGS. 5 and 6).

  Since the drainage jacket 2 and the tubular member 3 are both made of a flexible material, the cross section of the drainage member 1 is flat before use. And the drainage member 1 which has such a softness | flexibility can be wound up with a reel.

Next, a method for forming the drainage hole 30 in the ground using the drainage member 1 will be described.
First, as shown in FIG. 3, the work base 10 for forming the excavation hole 14 on the slope of the mountain is installed. As a specific example, a plurality of jackets 11 made of a tubular woven fabric for cutting a tree on a slope of a mountain forming the excavation hole 14 and injecting mortar are horizontally installed. The jackets 11 are fixed with anchors 12 respectively. Then, the work base 10 is installed on the slope of the mountain by injecting mortar into the plurality of jackets 11 and solidifying them.

  Next, as shown in FIG. 4, the excavation hole 14 is formed by the excavator 13 from the slope of the mountain (first step). In other words, the excavator 13 is installed on the work base 10, the reaction wall 15 is formed on the work base 10 and fixed with the anchor 16, and the reaction machine wall 15 takes the reaction force and the mountain with the excavator 13. The excavation hole 14 is formed in a substantially horizontal direction from the slope. However, in order to discharge water flowing into the excavation hole 14, the excavation hole 14 needs to be gently inclined toward the outlet side. As the excavator 13 that can be used here, various types can be used. Among them, for example, high water pressure excavation for excavating the ground by jetting a high water pressure pressurized by the pump 17 to the ground. You can use the machine.

  Next, as shown in FIG. 5, the drainage member 1 is inserted into the excavation hole 14 (second step). In this second step, the reel 18 around which the drainage / drainage member 1 is wound is installed on the work base 10, and the drainage / drainage member 1 is pulled out from the reel 18 and inserted into the excavation hole 14. At that time, the drainage member 1 (see FIG. 1) that overlaps the tubular woven fabric 4, the shape-retaining member 5, and the tubular member 3 in this order from the inside is inserted into the excavation hole 14 while turning upside down. Then, the drainage member 1 is arranged so that the tubular member 3, the shape retaining member 5, and the tubular woven fabric 4 are arranged in this order from the inside.

  The inside-out operation of the drainage member 1 will be described in detail with reference to FIG. First, the end 1a of the drainage member 1 is folded back and fixed to the annular fixing portion 19a of the metal fitting 19 for turning over. At this time, the sealing member 20 is in contact with the outer peripheral surface of the outer tubular member 3, and a substantially sealed space 21 is formed inside the folded tubular member 3. In this state, pressurized air is injected into the space 21 from the air inlet 22 and air pressure is applied to the folded portion 3a of the tubular member 3 to turn the collecting / draining member 1 upside down. It is pulled out from 18 and placed in the excavation hole 14. Although the air pressure required to turn over the drainage member 1 depends on the diameter of the excavation hole, it is, for example, about 0.1 MPa when the diameter is 50 mm. By arranging the drainage / drainage member 1 upside down in this way, a large frictional force does not occur between the drainage / drainage member 1 and the excavation hole 14, so the drainage / drainage member 1 can be easily inserted into the excavation hole 14. it can. Furthermore, simultaneously with the insertion, the tubular woven fabric 4 can be positioned on the outermost side in the excavation hole 14, and the tubular woven fabric 4 can be brought into contact with the inner surface of the excavation hole 14. As shown in FIG. 5, the hose 24 is inserted into the excavation hole 14 before the drainage member 1 is inserted into the excavation hole 14, and the drainage member 1 is inserted into the excavation hole 14. In addition, the air in the excavation hole 14 may be discharged through the hose 24.

  Next, as shown in FIGS. 7 and 8, the fluidized solidifying material 23 is injected into the shape maintaining member 5 and solidified (third step). As the fluidized solidifying material 23, a cement-based solidifying material such as mortar, cement milk or concrete is used. Here, pressurized air is supplied into the innermost tubular member 3 (arrow a in FIG. 7), and the tubular woven fabric 4 located outside the shape holding member 5 is placed on the inner surface of the excavation hole 14. In a state of being in close contact, the fluidized solidifying material 23 is injected into the shape holding member 5 at a pressure higher than the air pressure and solidified (arrow b in FIG. 7). In this way, the tubular woven fabric 4 reliably adheres to the inner surface of the excavation hole 14, so that the water in the ground easily flows into the tubular woven fabric 4.

  Further, as described above, the shape maintaining member 5 has the spine portion 5a and a plurality of annular portions 5b communicating with the spine portion 5a. Then, as shown in FIG. 2, the fluidized solidifying material 23 is injected from the end of the spine portion 5a, and the plurality of annular portions 5b are filled with the fluidizable solidifying material 23 from the spine portion 5a. Therefore, the fluidizable solidifying material 23 can be injected into all the annular portions 5b at a time.

  Finally, as shown in FIG. 9, the tubular member 3 is removed from the excavation hole 14 while turning over again (fourth step). The tubular member 3 turned upside down in the second step (see FIG. 5) is wound in the reverse direction by the reel 18, so that only the tubular member 3 is turned over again in the direction opposite to the second step. 14 is pulled out. In the above-described third step, the fluidized solidifying material 23 is injected into the shape holding member 5 and solidified, so that the shape holding member 5 or the shape holding member 5 is pressed against the inner surface of the excavation hole 14. The tubular woven fabric 4 is not pulled out from the excavation hole 14, and only the tubular member 3 is peeled off from the shape holding member 5 and removed. And the drainage hole 30 by which the inner surface of the excavation hole 14 was covered with the drainage jacket 2 is formed.

  By the way, it is conceivable that after the construction of the drainage hole 30, the inside of the drainage hole 30 is blocked due to various factors such as the growth of moss and the propagation of bacteria. Therefore, the inside of the drainage hole 30 is regularly inspected with a small TV camera or the like, and depending on the situation, a high water pressure water stream is jetted into the drainage hole 30 as shown in FIG. It is preferable to clean the inside of the drain hole 30.

According to the method for forming the drainage member 1 and the drainage hole 30 described above, the following effects are obtained.
The drainage / drainage member 1 has a drainage / drainage member 1 including a cylindrical woven fabric 4 having water permeability and a shape maintaining member 5 into which a fluidized solidifying material 23 is injected. For this reason, in the state where the flowable solidifying material 23 in the shape holding member 5 is solidified, the shape holding member 5 secures strength against earth pressure, so that the drainage hole 30 can be prevented from being crushed by earth pressure.

  Since the shape holding member 5 has a backbone portion 5a extending in the longitudinal direction of the tubular woven fabric 4 and a plurality of annular portions 5b communicating with the backbone portion 5a, the shape retaining member 5 is connected to the plurality of annular portions 5b from the backbone portion 5a. Thus, the fluidized solidifying material 23 can be injected at a time. The plurality of annular portions 5b are parallel to a plane orthogonal to the longitudinal direction of the tubular woven fabric 4 (longitudinal direction of the excavation hole 14), and the solidified material 23 is injected into the plurality of annular portions 5b to be solidified. In this state, the strength against earth pressure is ensured by the plurality of annular portions 5b, so that the drainage holes 30 can be reliably prevented from being crushed by earth pressure. Further, the plurality of annular portions 5b are provided at a predetermined interval in the longitudinal direction, and water in the ground surely flows into the drainage hole 30 from between the annular portions 5b. Drainability can be ensured.

  Since the outer side of the drainage jacket 2 is covered with a tubular member 3 and the outer surface of the drainage jacket 2 is protected by the tubular member 3, the drainage member 1 is transported or stored, or excavated. When inserting into the hole 14, it can prevent that the outer surface of the drainage jacket 2 is damaged.

  Since the drainage jacket 2 and the tube-like member 3 are formed of a flexible material, the drainage member 1 can be wound around the reel 18 and transported or stored, improving workability. In addition, the work space at the construction site is small.

  By inserting the drainage member 1 while turning it upside down into the excavation hole 14, the tubular woven fabric 4 having water permeability is positioned on the outermost side and is in close contact with the inner surface of the excavation hole 14. On the other hand, since the tubular member 3 that protected the drainage jacket 2 is located on the innermost side, the tubular member 3 can be easily removed from the excavation hole 14. Further, since the flexible drainage member can be continuously inserted into the excavation hole while turning over, the process can be simplified.

Next, modified embodiments in which various modifications are made to the embodiment will be described.
1] The shape holding member is not limited to the shape of the shape holding member 5 of the above embodiment, and various shapes such as a member having a plurality of spine portions can be adopted. Furthermore, the thing etc. which have the shape which arrange | positions the cylindrical member which consists of woven fabric etc. spirally along the inner surface of an excavation hole can be used.

2] As the fluidized solidifying material to be injected into the shape holding member, a synthetic resin-based solidifying material such as a thermosetting resin can be used in addition to the cement-based solidifying material of the above-described embodiment.
3] The present invention is not limited to the case where the drainage hole is formed on the slope of the mountain, but can also be applied to the case where water is drained on various grounds such as a flat ground, a wetland, and a beach.

It is a partially notched top view of a drainage member. It is a perspective view of a shape maintenance member (after fluid solidification material injection | pouring). It is explanatory drawing of the formation process of a work base. It is explanatory drawing of a drilling hole formation process (1st process). It is explanatory drawing of the insertion process (2nd process) of a drainage member. It is the elements on larger scale of FIG. 5 explaining the inside-out operation | work of a drainage member. It is explanatory drawing of a solidification material injection | pouring process (3rd process). It is the VIII-VIII sectional view taken on the line of FIG. It is explanatory drawing of a tubular member removal process (4th process). It is a figure which shows the drainage hole after construction. It is the XI-XI sectional view taken on the line of FIG. It is a figure which shows an example of the cleaning operation | work of a drainage hole. It is a figure which shows the draining method for the conventional landslide prevention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Collecting / draining member 2 Collecting / draining jacket 3 Tubular member 4 Tubular woven fabric 5 Shape holding member 5a Spine part 5b Annular part 14 Excavation hole

Claims (5)

A cylindrical woven fabric having water permeability, and a shape-holding member that is mounted on the outside of the cylindrical woven fabric and has a hollow shape and flexibility, and a shape-holding member into which a fluidized solidifying material is injected. A drainage jacket,
A tubular member covering the outside of the drainage jacket;
A drainage member characterized by comprising: The shape holding member is
A spine extending in the longitudinal direction of the tubular woven fabric;
A plurality of annular portions provided in the spine portion in communication with the spine portion, parallel to a plane perpendicular to the longitudinal direction and spaced apart from each other in the longitudinal direction;
The drainage member according to claim 1, comprising:   The drainage and drainage member according to claim 2, wherein the spine portion and the plurality of annular portions are woven fabrics having water permeability. A first step of forming a borehole in the ground;
A drainage jacket including a tubular woven fabric having water permeability and a hollow and flexible shape holding member attached to the outside of the tubular woven fabric, and a tubular member covering the outside of the drainage jacket. A second step of inserting the collecting and draining member into the excavation hole while turning over so that the tubular member, the shape holding member, and the tubular woven fabric overlap in order from the inside;
A third step of injecting and solidifying a flowable solidifying material into the shape holding member;
A fourth step of removing only the innermost tubular member from the excavation hole;
A method for forming a drainage hole, characterized by comprising: The method for forming a drainage hole according to claim 4, wherein in the fourth step, the tubular member is removed from the excavation hole while turning over again.

Images