JP4296660B2 - Slope stabilization method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a slope stabilization method, and more particularly, to a slope stabilization method capable of simultaneously constructing a ground restraint reinforcement work and a groundwater drainage work.
[0002]
[Prior art]
For slope stabilization measures such as cutting, embankment slopes and retaining walls, anchors are buried in the ground, and the earth-ground reinforced earth method and ground anchor method that suppresses and strengthens the collapse of the ground are known. Yes.
[0003]
By the way, various factors are assumed for the collapse of this kind of natural ground, but the existence of pore water pressure in the natural ground is one of the factors. Aside from this, a drainer was constructed to reduce the pore water pressure in the ground.
[0004]
In this drainage, for example, after anchors (tensile materials) were constructed with a square pitch by a natural ground reinforced earth method, drainage boring holes for drainage were drilled between the anchors.
[0005]
However, such conventional slope stabilization methods have the following technical problems.
[0006]
[Problems to be solved by the invention]
In other words, the conventional slope stabilization method described above requires a plurality of drilling holes for anchor embedding and draining, and the size, direction and depth of these drilling holes are different, making the drilling holes complicated. The number of man-hours for construction will increase.
[0007]
Further, in general, compared to the number of anchors such as earth reinforced earthworks, the drainage boring holes have a problem that the pitch is rough and the number of constructions is small, so that the drainage of groundwater becomes insufficient.
[0008]
The present invention has been made in view of such conventional problems, and the purpose of the present invention is to provide a sufficiently effective groundwater drainage effect, and to enable a significant reduction in construction costs. The purpose is to provide a stabilization method.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention cuts a plurality of anchors whose tip side is fixed in the ground and whose head side is fixed to the slope surface, and embedded in slope ground such as embankment slope and retaining wall. In the slope stabilization method that reinforces the structure, the anchor has water permeability that is provided on the outer periphery of a portion other than the hollow tube body having a large number of through water collecting holes and a fixing portion on the tip side of the hollow tube body. Drainage material having, and the hollow tube body is placed in the natural ground so that the tip side is located higher than the head side, and groundwater in the natural ground through the drainage material and the water collection hole A slope stabilization method in which the hollow tube body is taken down into the hollow tube body and then flows down and discharged to the outside. The hollow tube body has a predetermined interval in the circumferential direction on the inner periphery and the outer periphery surface. Having a plurality of reinforcing ribs projecting outwardly across and extending in the axial direction, The anchor inserts and installs the drainage material and the hollow tube into a drilling hole formed in a natural ground, and then passes through the injection pipe installed in the hollow tube. The grout material was injected and hardened from the front end of the body to the natural ground, and the front end was fixed in the natural ground .
According to the slope stabilization method constructed in this way, the tip side is fixed in the ground and the head side is fixed to the slope surface on the slope such as cutting, embankment slope and retaining wall, etc. The anchor includes a hollow tube body having a large number of through water collecting holes and a water-permeable drainage material provided on the outer periphery of a portion other than the fixing portion on the distal end side of the hollow tube body. After placing the groundwater in the ground in the hollow pipe through the drainage and the water collecting holes, the groundwater flows down the hollow pipe. To discharge to the outside.
In other words, the anchor according to the present invention has a function that combines the suppression and construction work of the natural ground and the groundwater drainage, and therefore, only one hole is required to be drilled in the natural ground. Improvements and significant reductions in construction costs can be achieved.
In addition, since the anchor has a function that combines the suppression and construction work of the natural ground and the groundwater drainage, the installation density of the drainage can be increased as a result, and the effect of the groundwater drainage is increased. Can be
[0010]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. 1 to 7 show a first embodiment of a slope stabilization method according to the present invention.
[0011]
The stabilization method shown in the figure is a method for stabilizing the slope 10 such as a cut, embankment slope or retaining wall, and the slope 10 has a predetermined vertical and horizontal direction. A plurality of anchors 12 are embedded in the natural ground 14 at intervals of.
[0012]
The planar arrangement state of the anchor 12 is set to a square pitch, for example, in the same manner as in the conventional natural ground reinforced earth method. Further, as shown in FIG. 3, each anchor 12 is fixed at the tip side in the natural ground 14, and the head side is fixed at the natural ground surface, that is, the surface of the slope 10.
[0013]
The anchor 12 of this embodiment has a hollow tube 16 as shown in detail in FIG. The hollow tube 16 shown in the figure includes a hollow cylindrical main body 16a having both ends opened, a large number of water collecting holes 16b formed through the outer peripheral surface of the hollow tube 16, and one end of the main body 16a. And a threaded portion 16c carved on the outer peripheral surface of the.
[0014]
Moreover, the anchor 12 of a present Example has the drainage material 18 provided in the outer peripheral side of the hollow pipe body 16, as shown in FIG. The drainage material 18 is formed in a hollow cylindrical shape with a member having water permeability such as a nonwoven fabric, and has a length that covers a portion other than the fixing portion provided on the distal end side of the hollow tube body 16. Yes.
[0015]
Furthermore, the anchor 12 of the present embodiment has a packer 20 disposed in the middle portion of the hollow tube body 16 as shown in FIG. In the packer 20, the grout material 22 to be injected when fixing the distal end side of the hollow tube body 16 into the natural ground wraps around the water-permeable drainage material 18 side, impairing the water permeability, It is provided to prevent the grout material 22 from being filled in the pipe body 16 and hindering the flow of ground water in the hollow pipe body 16.
[0016]
For this reason, the packer 20 is disposed on the outer periphery of the hollow tube body 16 so as to be adjacent to the distal end side of the drainage material 18, and is disposed so as to close the inside of the hollow tube body 16 at the same position. .
[0017]
When installing the anchor 12, first, as shown in FIG. 1, a hole 24 is formed in the natural ground 14 from the surface of the slope 10. The hollow tube 16 is inserted and installed in the hole 24. At this time, the hollow tube body 16 is positioned above the horizontal so that the distal end side of the hollow tube body 16 is located slightly above the head side. It is formed so as to be inclined at a predetermined inclination angle, for example, about 5 °.
[0018]
When the hole 24 is formed, the hollow tube body 16 is inserted and installed therein as shown in FIG. At this time, the packer 20 is attached to the hollow tube body 16 at a predetermined position, and an injection pipe 26 for the grout material 22 is installed therein.
[0019]
The drainage material 18 can be installed by being mounted on the outer periphery of the hollow tube body 16, or after the hollow tube body 16 is installed and the grout material 22 is injected, the outer periphery of the hollow tube body 16 is disposed. You may attach to.
[0020]
In addition, when using the thing of the structure which expands the diameter of the packer 20 by fluid injection | pouring, after inserting and installing the drainage material 18 previously in the hole 24, the hollow tube body 16 equipped with the packer 20 is inserted and installed. You can also
[0021]
Then, when the hollow tube body 16 is installed in the drilling hole 24, the solidifying grout material 22 such as mortar is injected into the distal end side of the hollow tube body 16 through the injection pipe 26, and the hollow tube body The grout material 22 is filled between the outer periphery of 16 and the inner peripheral surface of the ground drilling hole 24 and hardened, and the distal end side of the hollow tube body 16 is fixed in the ground 14.
[0022]
When the fixing of the distal end side of the hollow tube body 16 is completed, the fixing plate 28 is attached to the head of the hollow tube body 16 protruding outward from the inclined surface 10, and the screw portion of the hollow tube body 16 is mounted. A fixing nut 30 is screwed to 16c and fixed to the surface of the inclined surface 10 (see FIG. 3).
[0023]
As a result, the distal end side of the hollow tube body 16 which is the main portion of the anchor 12 is fixed in the natural ground, and the head side is fixed to the slope 10, thereby preventing and reinforcing the collapse of the slope 10.
[0024]
On the other hand, the hollow tube body 16 placed in the natural ground 14 is installed in an inclined state so that the tip side is higher than the head side, and the water-permeable drainage material 18 installed on the outer periphery of the main body 16a. And the water collection hole 16b penetrating the main body 16a, the groundwater in the natural ground 14 is taken into the hollow tube body 16 through the drainage material 18 and the water collection hole 16b, Thereafter, it flows down through the hollow tube 16 and is discharged to the outside.
[0025]
Now, according to the slope stabilization method performed as described above, the anchor 12 has the function of combining the deterrent reinforcement work of the natural ground 14 and the groundwater drainage work. The number of drill holes 24 to be drilled is only one, and the construction efficiency can be improved and the construction cost can be greatly reduced.
[0026]
In addition, since the anchor 12 has a function that combines the detention reinforcement work of the natural ground and the groundwater drainage, the installation density of the drainage can be increased as a result, and the effect of the natural drainage Can be increased.
[0027]
FIG. 8 shows a modification of the hollow tube body 16 ′ that can be used in the first embodiment. The hollow tube body 16 'shown in this figure is provided with a water collecting hole 16b "and a reinforcing rib 16d extending along the axial direction of the main body 16a'.
[0028]
A plurality of such reinforcing ribs 16d can be provided on either or both of the inner peripheral surface and the outer peripheral surface of the main body 16a '. When the hollow tube body 16 ′ having such a structure is used, the axial rigidity of the hollow tube body 16 ′ is increased by the reinforcing rib 16d in addition to the operational effects of the first embodiment. The deterrent reinforcement effect of the natural ground 14 can be further strengthened.
[0039]
【The invention's effect】
As described above in detail in the embodiments, according to the slope stabilization method according to the present invention, the effect of removing groundwater can be sufficiently obtained, and the construction cost can be greatly reduced.
[0040]
[Brief description of the drawings]
FIG. 1 is a cross-sectional explanatory view of an initial step of a first embodiment of a slope stabilization method according to the present invention.
FIG. 2 is a cross-sectional view illustrating a process performed subsequent to FIG.
3 is a cross-sectional explanatory diagram of a process performed subsequent to FIG. 2. FIG.
FIG. 4 is a perspective view of a hollow tube used in the first embodiment.
5 is a cross-sectional view taken along line AA in FIG.
6 is a cross-sectional view taken along line BB in FIG.
7 is a cross-sectional view taken along the line CC in FIG. 3. FIG.
FIG. 8 is a cross-sectional view of a modified example of the hollow tube used in the first embodiment.

Claims (1)

In slope stabilization method that reinforces by cutting multiple anchors whose tip side is fixed in the ground and the head side is fixed to the slope surface, and embedded in slope ground such as embankment slope and retaining wall,
The anchor is a hollow tube having a large number of through water collecting holes;
A drainage material having water permeability provided on the outer periphery of a portion other than the front end side fixing portion of the hollow tube body,
The hollow tube body was placed in a natural ground so that the tip side was positioned higher than the head side, and groundwater in the natural ground was taken into the hollow tubular body through the drainage material and the water collecting hole. Later, it is a slope stabilization method of flowing down the hollow tube body and discharging to the outside ,
The hollow tubular body has a plurality of reinforcing ribs protruding outward in the circumferential direction at a predetermined interval on the inner and outer circumferential surfaces, and extending in the axial direction.
The anchor inserts and installs the drainage material and the hollow tube into a drilling hole formed in a natural ground, and then passes through the injection pipe installed in the hollow tube. A slope stabilization method characterized by injecting and hardening grout material from the front end of the body toward the ground and fixing it in the ground .

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