JP4240468B2 - Slope stabilization method - Google Patents

Description

  The present invention relates to a method for stabilizing a slope using a spiral pile.

  Conventionally, as a construction method for preventing the collapse of slopes such as mountains, for example, anchors each provided with a pressure bearing plate are installed in multiple rows on the slope, and the heads of each anchor are connected by connecting members and attached to each anchor. A support plate that stabilizes the slope by applying a support pressure to the ground (Patent Document 1), a lock bolt that is driven into the slope as a reinforcing material, and a net that is placed on the driven lock bolt to stabilize the slope (patent) Document 2) has been proposed.

Also, after drilling the slope created by the cut to a hard foundation ground, forming the peripheral edge of the drilled hole into a concave mold, and then making it into a concave hole, PC steel wire, PC steel twisted wire, etc. A method to stabilize the cut slope by inserting a tensile reinforcement and introducing axial force to the tensile reinforcement using the restraint pressure application plate installed at the concave hole mouth as a base (Patent Document 3), bolts on the cut slope Drill the insertion hole, set the sheet-like reinforcing material on the slope, fix the plate according to the bolt insertion hole, fill the bolt insertion hole with grout, insert the bolt through the plate, plate A construction method (Patent Document 4) has been proposed.
JP 2002-88769 A JP 2002-242191 A JP-A-8-134923 JP 7-216900 A

The slope stabilization methods described in Patent Document 1 and Patent Document 2 have good workability, and are excellent in applicability to high places, long slopes, and slopes with many irregularities. The methods in Patent Document 3 and Patent Document 4 are landslides. However, each method has a problem that a working device must be brought to the site, which requires a relatively long construction period and high construction costs.

An object of the present invention is to solve the above-described problems, and it is an object of the present invention to prevent the collapse of the slope surface layer without requiring time for construction and without damaging the slope at low cost.
For this purpose, the present invention processes the fixing part into a spiral shape, and after driving a steel spiral pile tip with the head turned back into a curved shape, inserts a pipe or the like into the curved part of the head and rotates it. Thus, it is characterized in that it is screwed into the slope at predetermined intervals, and the curved heads of the driven piles are connected with a connecting material.
In addition, the present invention is characterized in that a plurality of spiral piles connected by a connecting material are installed in a plurality of stages at predetermined intervals according to the height of the pile.

  As described above, according to the present invention, the pile pile can be driven manually, so that it is not necessary to bring a device for installation at the site, the cost is very low, and the pasting such as mowing and topsoil shaping is performed. Surface generation is not required, the surface of the slope is not damaged, and the construction speed can be made very fast.

Embodiments of the present invention will be described below.
FIG. 1 is a conceptual diagram illustrating the slope stabilization method of the present embodiment, and FIG. 2 is a diagram illustrating a helical pile.
As shown in FIG. 1 (a), a spiral pile 1 having a fixing portion formed into a spiral shape is driven into a natural ground 4 through a top soil 3 at an interval of 1 m, for example, on a slope where surface layer collapse is to be suppressed. Are connected by a connecting material 2 made of an aluminum tube, a stainless steel tube or the like. As shown in FIG. 1B, a plurality of stages having this structure are installed at intervals of 1 m, for example, according to the height of the paste.

  In this way, it is a structure that drives multiple piles and connects the pile heads with connecting materials, so when used as a sloped surface work, it can be driven manually, so the equipment for installation at the site There is no need to bring in, and the cost is very low, and there is no need to create a slope surface such as mowing or topsoil shaping, and the construction speed is very fast without damaging the slope surface.

  As shown in FIG. 2 (a), the spiral pile 1 to be used is a steel pile in which the fixing portion is spirally processed and the head is turned back into a curved shape. By inserting a pipe or the like into the part and rotating it, it is driven in a screwed manner. In this embodiment, a pile with a total length of 557 mm, a pile spiral portion with a cylinder diameter of 85 mm, and a cylinder length of 208.3 mm was used. As shown in FIG. 2B, the spiral pile is driven into the slope leaving the pile head folded back in a curved shape, and the spiral portion is installed so as to reach the natural ground 4 through the topsoil 3.

FIG. 3 is a view for explaining a method for fixing the connecting member of the spiral pile head.
As shown in FIG. 3 (a) (front view) and FIG. 3 (b) (cross-sectional view), a fixing band 5 made of stainless steel or the like for fixing the connecting material 2 is attached to the pile head, and thereby an aluminum tube The connecting member 2 made of stainless steel or the like is fixed.

FIG. 4 is a diagram for explaining a method of connecting the connecting members.
In this embodiment, the attachment pipe 6 made of stainless steel or the like is used, and the connection material 2 is inserted into the attachment pipe 6 from both sides and connected.

FIG. 5 is a diagram for explaining a method for constructing a spiral pile.
In this embodiment, the above-described spiral pile is driven at 1 m intervals, and the heads are connected by the connecting material 2. Here, a 4 m connecting material is used, and the connecting materials are connected by the attachment pipe 6. The thing of such a structure is installed at 1 m intervals according to the height of the paste.

In the above example, the distance between the spiral piles is 1 m, and the distance between each stage is 1 m when installing multiple stages, and the spiral piles are installed at 1 / m ^2. Since the load carried by the stake changes, it is necessary to appropriately change the number of spiral piles per unit area according to the slope of the slope and the height of the slope.

FIG. 6 is a front view for explaining a construction example.
1st stage: 18.5m, 20 spiral piles, stainless steel pipe 4m x 4 + 2.5m as connecting material
Second stage: 17.5m, 19 spiral piles, stainless steel pipe 4m x 4 + 1.5m as connecting material
3rd stage: 16.0m, 17 spiral piles, stainless steel tube 4m x 4 as connecting material
4th stage: 16.0m, 16 spiral piles, stainless steel tube 4m x 4 as connecting material
5th stage: 8.0m, 8 spiral piles, stainless steel tube 4m x 2 as connecting material

It is a conceptual diagram explaining the slope stabilization construction method of this embodiment. It is a figure explaining a spiral pile. It is a figure explaining the connection material fixing method of a spiral pile head. It is a figure explaining the connection method of connection materials. It is a figure explaining the construction method of a spiral pile. It is a front view explaining a construction example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Spiral pile, 2 ... Connection material, 3 ... Top soil, 4 ... Ground, 5 ... Fixed band, 6 ... Mounting pipe.

Claims (2)

The fixing part is processed into a spiral shape, and the tip of a steel pile pile with a curved head is driven in. After that, a pipe or the like is inserted into the curved part of the head and rotated to rotate the slope. slope stabilization method which is characterized in that seen write out at predetermined intervals, connecting the curved head of the spiral pile implanted consolidated material. The slope stabilization method according to claim 1, wherein a plurality of spiral piles connected by a connecting material are installed in a plurality of stages at predetermined intervals according to the height of the pile.

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