JPH06102891B2 - Civil engineering anchor method and anchor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-pipe anchoring method for civil engineering, which is used for drainage and ground stabilization such as landslide prevention, slope collapse prevention, ground improvement and collapse risk point prevention.

[0002]

2. Description of the Related Art Conventionally, a stable construction method for natural grounds and a drainage construction method have been separately constructed. Anchors (using steel rods 14) are used to stabilize the ground (Fig. 9).
However, because it cannot be drained, a large number of anchors were required in consideration of the water content of the ground in the stable calculation. In addition, a perforated pipe 15 is used in the drainage method, but if there is a permeable layer 12 etc., water will flow into it and cause collapse, and if the entire pipe is not in a saturated state of water, the effect will be No function could be exerted on the perforated tube 15 at the upper part (Fig. 9).

[0003]

DISCLOSURE OF THE INVENTION The present invention provides an anchor construction method for stabilizing the ground and a drainage construction method capable of guiding the water that has penetrated into the ground to the ground surface early and safely before it becomes saturated. The purpose is to obtain a multi-pipe anchoring method for civil engineering that can be done with the same construction.

[0004]

To achieve the above object, the present invention provides a water-impermeable outer tube with a water-impermeable inner tube through a gap, and has a communicating portion between the inner tube and the gap, A multiple pipe, which is provided with a water collecting joint between the outer pipe and the inner pipe in the same communication part, is buried at an elevation angle from the ground surface of the unstable ground part toward the stable ground part, and one end of the inner pipe To the ground surface, take groundwater from the outer pipe through the water collection joint into the inner pipe,
Anchor construction method for civil engineering characterized by draining from the ground surface Push the ground surface with the ground surface pushing portion provided on the ground surface side of the multiple pipe, between the multiple pipe and the stable portion on the ground stable portion side The anchor for a civil engineering work according to the first aspect of the present invention, which forms the fixing portion, is formed by the anchor for the civil engineering comprising the multiple pipe according to the first aspect of the present invention, which is provided with a projection for preventing sliding.

[0005]

In the present invention, the multiple pipes 5 are placed in the ground unstable portion 6 to resist the shearing force of the groundwater surface (anti-slip surface) 11. Further, since the fixing portion 9 at the tip is fixed to the ground stabilizing portion 7, the frictional force around the pipe and the pushing portion 8 of the ground surface 6 '
This resists the force of the unstable ground portion 6 to collapse (Fig. 1). In this construction method, water that permeates from the ground surface 6'can be discharged to the outside through the upper multiple pipe 5. Further, if the multiple pipes 5 hit the water layer in the unstable portion 6, water can be drained to the ground surface 6 ′ from any pipe, so that the water content in the unstable portion 6 is reduced early and the unstable portion 6 Collapse can be prevented by reducing the self-weight (Fig. 2).

That is, the gap t from the water permeable outer tube 1 of the multiple tube 5 buried at an elevation angle from the unstable ground portion 6 to the stable portion 7.
The groundwater that has entered the inside naturally flows into the impermeable inner pipe 2 through the water collecting joint 4, and passes through the inner pipe 2 without escaping to the permeable layer 12 on the groundwater surface 11 and the ground surface 6 ′. It is discharged to the outside from the inner tube 2 which is opened at.

The multiple pipe 5 is stably embedded as the anchor without the possibility that the sliding prevention projection 10 provided on the outer surface will catch on the ground and slide on the ground surface 6'side.

Further, the ground surface pushing portion 8 at one end of the multiple pipe 5 holds down the ground surface 6 ', and the fixing portion 9 at the other end thereof is the ground stabilizing portion 7
The ground unstable portion 6 is fixed to the ground stabilizing portion 7 by the multiple pipe 5.

[0009]

EXAMPLE A non-permeable impermeable inner tube 2 is concentrically provided inside a water-permeable outer tube 1 having a large number of water-permeable holes 1'through a gap t. At the upper end of this inner pipe 2, a funnel-shaped water collecting joint 4
And a water-permeable outer tube 1 is fitted to the upper end of the joint 4 to form a communication portion 3 between the inner tube 2 and the gap t. On the outer periphery of the upper end of the water collecting joint 4, a slide preventing projection 10 is provided by a flange to form one unit of the short multiple pipe 5, and as shown in FIG. 4, a large number of units are connected to form a long multiple pipe 5. . The protrusion 10 may be provided on the outer circumference of the outer tube 1 or may be oblique to the center line of the multiple tube 5 as shown in FIG.

At a place where a rock mass unstable portion 6 such as a weathered layer is in an inclined state on a rock ground stable portion 7 such as a rock mass, the above ground surface 6'of the rock unstable portion 6 is used as described above. Lateral boring is carried out slightly upward (elevation angle) toward the stabilizing portion 7, and the multiple pipe 5 is inserted into the boring hole 13,
A fixing portion 9 is formed by fixing the insertion tip portion at a boring expansion hole portion of the ground stabilization portion 7 by a method such as tapping diameter expansion and mortar injection. After that, the boring hole 13 collapses and the protrusion 10 engages in the hole 13.

The inner tube 2 of the insertion multi-tube 5 is opened to the ground surface 6 ', and the pushing portion 8 of the ground surface 6'is provided at one end of the multi-tube 5. The pushing portion 8 is formed of a reinforced concrete block or the like, and the multiple pipe 5 is inserted and fixed in the block.

[0012]

Since the present invention is based on the above-mentioned method, the drainage work and the stabilization work in the ground can be performed by the same construction, so not only the construction cost can be saved but also the construction is safe and the construction period can be shortened. There are effects such as getting. That is, the groundwater that has entered the impermeable inner tube 2 from the water collecting joint 4 through the gap t from the water permeable outer tube 1 of the buried multiple pipe 5 does not dissipate the water in the water table 11 without escaping in the permeable layer 12. It can be discharged to the outside of the ground surface 6'and the water table 11 can be eliminated to prevent landslides. The sliding prevention projections 10 stabilize the ground unstable portion 6 without the risk of the multiple pipes 5 sliding on the ground surface 6 ′ side. Further, the ground unstable portion 6 has an effect that it can be stabilized by being sandwiched by the ground surface pushing portion 8 and the fixing portion 9.

[Brief description of drawings]

FIG. 1 is a side view showing an anchor construction method for civil engineering of the present invention.

FIG. 2 is a side view showing a state in which groundwater is discharged.

FIG. 3 is a side view of a multi-tube.

FIG. 4 is a side view of a multi-unit multi-tube.

FIG. 5 is a vertical cross-sectional front view of the multiple pipe.

FIG. 6 is a perspective view of a water collecting joint.

FIG. 7 is a partial side view of the multiple pipe.

FIG. 8 is a side view of an embodiment of a sliding prevention protrusion.

FIG. 9 is a side view of a conventional anchor construction method.

[Explanation of symbols]

 1 Water-permeable outer tube t Gap 2 Water-impermeable inner tube 3 Communication part 4 Water collecting joint 5 Multiple pipe 6 Ground unstable part 6'Ground surface 7 Ground stable part 8 Ground surface indented part 9 Anchored part 10 Anti-slip Projection

Claims (3)

[Claims] 1. A water-impermeable outer tube is provided with a water-impermeable inner tube through a gap, and a communication portion between the inner tube and the gap is provided, and the communication portion includes a collection of the outer tube and the inner tube. A multiple pipe with a water joint is buried at an elevation angle from the ground surface of the ground unstable part toward the ground stable part, one end of the inner pipe is opened on the ground surface, and groundwater is supplied from the outer pipe. An anchor construction method for civil engineering, characterized in that the water is taken into the inner pipe through a water collecting joint and drained from the ground surface. 2. The ground surface pushing portion provided on the ground surface side of the multiple pipe is pushed into the ground surface to form a fixing portion for the multiple pipe and the stable portion on the ground stabilizing portion side. Civil engineering anchor construction method described. 3. A slide-preventing protrusion is provided on the outer surface.
(1) An anchor for civil engineering consisting of the described multiple pipes.