JP2007217931A - Drainage structure in slope stabilizing construction - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a work burden and construction cost, by providing a drainage structure in slope stabilizing construction capable of improving workability with a simpler constitution. <P>SOLUTION: A drain pipe 6 having an upper part formed in a porous shape is arranged in a clearance part between an inner wall of a drilled hole 2 formed in the ground 1 and a reinforcing material 3 having a tip part anchored in the ground 1 via an anchoring part 4 arranged in a bottom part of its drilled hole 2 in a state of being fitted around the reinforcing material 3 by arranging a water communication clearance. Instead of the drain pipe 6, a water communication member such as nonwoven fabric and a loofah may be arranged in a state of being attached to the periphery of the reinforcing member 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a drainage structure in slope stabilization construction for natural slopes, constructed slopes, and the like.

As a conventional technique for drainage in slope stabilization construction, a water-impervious inner pipe is provided with a gap in the water-permeable outer pipe, and groundwater flowing through the water-permeable outer pipe passes through the water-impermeable inner pipe to the outside of the surface. A large number of units composed of multiple pipes configured to allow drainage are connected to form a reinforcing material, and the reinforcing material formed by connecting the multiple pipes is inserted into the drilling hole, and a fixing portion is attached to the tip. What forms simultaneously drainage construction and stabilization construction by forming is known (refer to patent documents 1). According to this prior art, the workability can surely be improved in that drainage construction and stabilization construction can be carried out simultaneously. However, since it takes a lot of time to manufacture a multi-pipe unit and to connect a large number of units to form a reinforcing material, it is very doubtful whether it will lead to an improvement in workability in total.
JP-A-6-88335

  In view of the above-described conventional technical situation, the present invention provides a drainage structure in slope stabilization construction that can improve workability with a simpler configuration, thereby reducing work burden and construction cost. It is intended.

  In order to solve the above-mentioned problem, in the invention of claim 1, an inner wall of a drilling hole formed in the ground, and a reinforcing material having a tip fixed to the ground via a fixing part installed at the bottom of the drilling hole In this gap portion, a technical means was adopted in which a drain pipe having a porous upper portion was installed in a state where a water passage gap was provided around the reinforcing material and fitted externally. Further, in the invention of claim 2, in the gap between the inner wall of the drilling hole formed in the ground and the reinforcing material whose tip is fixed to the ground via the fixing part installed at the bottom of the drilling hole, A technical means was adopted in which a water-permeable member such as a nonwoven fabric or loofah was installed in a state of being attached around the reinforcing material.

  According to the present invention, a hole formed in the ground is used to install a reinforcing material such as a rock bolt or other anchor material, and an upper portion is formed in a gap between the inner wall of the hole and the reinforcing material. Drainage and stabilization work can be carried out at the same place by a very simple work of installing a porous drainage pipe or a water-permeable member such as nonwoven fabric or loofah attached to the reinforcing material or attached to the periphery. Since construction can be performed simultaneously, workability can be greatly improved. In addition, the drainage passage uses a drainage pipe with a much simpler structure than the above-mentioned prior art, or a water drainage member such as a non-woven fabric or loofah, reducing the work load and construction costs. Also effective.

  According to the present invention, an appropriate reinforcing material such as a lock bolt or other anchor material is inserted into a drilling hole drilled in an appropriate method on the ground via a fixing portion whose tip is installed at the bottom of the drilling hole. Slope stabilization construction that is installed in a fixed state on the ground can be widely applied regardless of whether it is for natural slopes such as natural mountains or slopes created by construction. it can. In addition, regarding the installation state of the reinforcing material and drilling holes, there is no particular problem when installing in a state where the tip end side is raised due to the relationship with the drainage gradient to the outside of the groundwater, but in the case of a horizontal state When installing in a state where the tip end side is slightly lowered, as described later, the drainage pipe should be installed in an inclined manner so that the inlet side is lowered with respect to the reinforcing material, as described later. Can do. The specific form of the porous shape formed on the upper part of the drain pipe may be one in which a large number of water passage holes made up of small holes are formed as in the following examples, or may be formed in a net shape. The drain pipe may be made of metal or synthetic material. The drain pipe and the reinforcing material are subjected to rust prevention treatment as necessary. In addition, the water-permeable member attached to the periphery of the reinforcing material is a non-woven fabric, fibrous sheet or string-like material, such as a loofah or sponge-like synthetic member, and a water passage for draining groundwater is formed. Any material can be used as long as it can be attached to the periphery of the material. Immediately after the construction, even if clogging of the surface portion of the water-permeable member occurs, it does not matter as long as a stable water-flow channel is formed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a construction state diagram showing a first embodiment of the present invention, and FIG. 2 is a perspective view showing a drain pipe used in the embodiment. In the figure, reference numeral 1 denotes a ground having an inclined surface, and reference numeral 2 denotes a hole formed in the ground 1. As shown in the figure, a reinforcing material 3 made of a rock bolt or the like is embedded in the drill hole 2 with respect to the ground 1 by burying the tip part in a fixing part 4 formed at the bottom of the drill hole 2. Installed in a fixed state. Incidentally, the tip of the reinforcing material 3 is injected into the bottom of the reinforcing material 3 while the reinforcing material 3 is inserted into the drilled hole 2, or after the grout material is injected into the bottom of the drilled hole 2. The portion is embedded in the fixing portion 4 by inserting the portion into the grout material.

  When the reinforcing material 3 is installed in the hole 2, as shown in the drawing, a drain pipe 6 in which a large number of water passage holes 5 formed of small holes are formed in the upper part, in this embodiment, the upper half is formed on the reinforcing material 3. Install in a state where a water flow gap is provided around and is fitted externally. After that, an appropriate material such as soil is filled between the drain pipe 6 and the inner wall of the drilling hole 2 as necessary, and the insertion portion is externally fitted to the protruding portion of the reinforcing member 3 protruding from the ground 1. However, stabilizing materials such as a frame and a support block (not shown) will be installed. Then, a nut is screwed into the male thread portion of the reinforcing member 3 exposed upward from the insertion portion formed in the normal frame, the supporting block, and the like, and tightened via the nut to apply tension to the reinforcing member 3. By doing so, the slope stabilization construction is completed. Incidentally, it is also possible to apply a tension force to the reinforcing material 3 by driving a wedge in a state where a tensile force is applied to the reinforcing material 3 using a tension device. It is important to secure a drainage channel so that the water in the drainage pipe 6 can be discharged to the outside when installing a stabilizing material such as the above-mentioned legal frame or bearing block.

  Thus, when the slope stabilization construction described above is executed, the groundwater in the ground 1 flows into the drain pipe 6 through the water holes 5 formed by a plurality of small holes formed in the upper part of the drain pipe 6. Flow into. Thereafter, the groundwater that has flowed into the drain pipe 6 flows down a portion of the drain pipe 6 where there is no lower hole, and passes through a drainage channel formed in a stabilizing material portion such as a method frame or a support block. It will be discharged to the outside. FIG. 3 is a construction state diagram showing an application example in the case where the reinforcing member 3 and the tip end side of the hole 2 have a low reverse gradient. As shown in the figure, when the tip of the reinforcing material 3 or the hole 2 has a low reverse slope, the drain pipe 6 is installed so as to be inclined with respect to the reinforcing material 3 so that the inlet side is low, thereby Smooth discharge to the outside is possible. As described above, according to the present invention, it is possible to easily cope with a reverse gradient with a small inclination angle, and it is also effective in expanding the application range.

  FIG. 4 is a perspective view showing a modified example of the drain pipe. In the case of the drainage pipe 7 according to this modification, a drainage similar to that in the case of the drainage pipe 6 is configured so that groundwater can flow into the pipe by forming a mesh portion 8 in the upper half thereof. Play a function.

  FIG. 5 is a construction state diagram showing a second embodiment of the present invention. The same components as those in the first embodiment will be described with the same reference numerals. In the case of this embodiment, the water flow member 9 made of a nonwoven fabric or the like for discharging groundwater to the outside is reinforced as shown in the figure. Reinforcing material in which the tip is fixed to the ground 1 via the inner wall of the drilling hole 2 formed in the ground 1 and the fixing part 4 installed at the bottom of the drilling hole 2 in a state of being attached around the material 3 3 adopts a drainage structure that is installed in the gap with 3. Incidentally, regarding a specific method of attaching the water-permeable member 9 to the periphery of the reinforcing member 3, a form in which the water-permeable member 9 is simply wound around the reinforcing member 3 may be used. It may be fixed using fixing means. Further, as shown in FIG. 6, in the state where the auxiliary pipe 10 that can be externally fitted to the reinforcing material 3 is used and the water-permeable member 11 is attached around the auxiliary pipe 10 by the above-described appropriate method, It is also possible to configure so as to fit externally. Furthermore, as shown in FIG. 7, a configuration in which the outer peripheral surface of the water passage member 11 is covered with an outer tube 12 whose upper half is formed in a porous shape is also possible.

It is the construction state figure which showed 1st Example of this invention. It is the perspective view which showed the drain pipe used in the Example. It is the construction state figure which showed the example of application when a reinforcing material and a drilling hole are reverse gradient. It is the perspective view which showed the modification of the drain pipe. It is the construction state figure which showed 2nd Example of this invention. It is the schematic which showed the modification of the water flow member. It is the schematic which showed the other modification of the water flow member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Ground, 2 ... Drilling hole, 3 ... Reinforcement material, 4 ... Fixing part, 5 ... Water passage hole, 6 ... Drain pipe, 7 ... Drain pipe, 8 ... Mesh part, 9 ... Water passage member, 10 ... Auxiliary pipe 11 ... Water-permeable member, 12 ... Outer tube

Claims (2)

  Drainage whose upper part is formed in a porous shape in the gap between the inner wall of the drilling hole formed in the ground and the reinforcing material whose tip is fixed to the ground via the fixing part installed at the bottom of the drilling hole A drainage structure in slope stabilization construction, characterized in that the pipe is installed in a state of being fitted with a water passage around the reinforcing material. A water-permeable member such as non-woven fabric or loofah is placed in the gap between the inner wall of the drilling hole formed in the ground and the reinforcing material whose tip is fixed to the ground via the fixing part installed at the bottom of the drilling hole. A drainage structure in slope stabilization construction, wherein the drainage structure is installed in a state attached around the reinforcing material.

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