JP2005097840A - Slope stabilization method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a slope stabilization method capable of preventing the collapse of a slope surface layer without damaging a slope at a low cost without taking much time for construction work. <P>SOLUTION: The slope stabilization method is so constituted that a plurality of spiral piles are driven at predetermined intervals, at the same time, the head sections of the spiral piles are connected with a connecting material and that a plurality of stages of a plurality of spiral piles connected with the connecting material can be installed on the slop at predetermined intervals according to a height of the slope. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

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

JP 2002-88769 A JP 2002-242191 A JP-A-8-134923 JP 7-216900 A

Conventionally, as a method for preventing the collapse of slopes such as mountains, for example, anchors each having a bearing plate are installed in multiple rows on the slope and the heads of the anchors are connected by connecting members, A mounted bearing plate that applies bearing pressure to the ground to stabilize the slope (Patent Document 1). A lock bolt is driven into the slope as a reinforcing material, and a net is stretched over the driven lock bolt to stabilize the slope. (Patent Document 2) has been proposed.
Also, after drilling the slope generated by the cut to a hard foundation ground, forming the peripheral edge of the drilled hole into a concave mold to make a concave hole, PC steel wire, PC steel stranded wire, etc. A method that stabilizes the cut slope by introducing axial force into the tensile reinforcement using the restraint pressure application plate installed at the concave hole opening as a pedestal (Patent Document 3), the cut method Cut the bolt insertion hole on the surface, 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, then pass the bolt through the plate A construction method (Patent Document 4) for inserting and tightening a plate has been proposed.

  The slope stabilization method described in Patent Literature 1 and Patent Literature 2 has good workability and is excellent in applicability to high places, long slopes and slopes with many irregularities. Can be applied to landslides and large-scale landslides, but each method has the problem that work equipment 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-mentioned problems, and it is an object of the present invention to prevent the slope of the slope surface from collapsing without requiring time for construction and without damaging the slope at a low cost.
For this purpose, the present invention reinforces the slope by driving a plurality of helical piles at a predetermined interval on the slope, and also exhibits the connection effect by connecting the heads of each spiral pile with a connecting material. It is characterized by reinforcing the slope.
Furthermore, after carrying out the reinforcement of the above-mentioned slope, various slope linings are laid on the slope to further enhance the slope and improve the landscape.

As described above, according to the present invention, it is not necessary to bring a device for installation to the site because the pile pile can be driven manually, and even if it is carried, it can be constructed with a light device such as a portable device. In addition, the cost is very low, and no slope correction such as mowing or shaping of the surface layer is required, so that the slope is not damaged and the construction speed can be made very fast.
In addition, if the slope is laid with a mortar or revegetation, such as mortar, after the slope is reinforced with the above-mentioned spiral pile, the slope will be further reinforced and the landscape will be improved.

Embodiments of the present invention will be described below.
FIG. 1 is a conceptual diagram for explaining a slope stabilization method according to this embodiment, and FIG. 2 is a diagram for explaining a spiral pile.
As shown in FIG. 1 (a), a spiral pile 1 having a fixing portion processed into a spiral shape is driven into the deep layer portion 4 through the surface layer portion 3 at intervals of 1 m, for example, with respect to the slope where the surface layer collapse is to be suppressed. Further, the pile heads are connected by a connecting member 2 made of an aluminum tube, a stainless tube, a steel rod, a wire 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 law.
In this way, since it is a structure in which a plurality of helical piles 1 are driven, when used as a slope work, it is possible to manually drive the helical piles, so it is not necessary to bring equipment for installation at the site, and the cost is very high. In addition, it is advantageous in that it does not require slope correction such as mowing and surface layer shaping, and does not damage the slope and has a very high construction speed. Moreover, by connecting the pile heads with the connecting material 2, the individual piles are connected to enhance the slope reinforcement effect.
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 folded back into a curved shape, for example, and after the head is driven slightly, A pipe or the like is inserted into the curved portion of the tube and rotated to drive it 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. 2 (b), the spiral pile is driven into the slope with the pile head folded back in a curved shape, and installed so that the spiral portion reaches the deep layer portion 4 through the surface layer portion 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) (side 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. At that time, the adhesive 7 may be used for fixing.
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 legal height.
This spiral pile was subjected to a vertical pull-out test and a horizontal unloading test in comparison with the mortar pile. The column diameter of the mortar pile was larger than that of the spiral pile for manufacturing reasons, so both the vertical pulling force and horizontal proof stress were larger than that of the spiral pile. At the same time, the yield strength decreased, but the spiral pile did not show any significant decrease even after the maximum yield strength was exhibited, indicating that it was highly tough. The horizontal strength is pulled out after the maximum strength is exhibited in the mortar pile, whereas the remarkable decrease in the strength is not seen in the spiral pile even after the maximum strength is exhibited, and the strength increases until it is completely pulled out, and it is slipped. There was a tendency to escape. In addition, the spiral pile after pulling out showed slight deformation at the head, but almost no deformation was observed at the fixing portion that had been spirally processed.
In general, mortar piles may not be able to expect proof strength depending on the construction conditions, but spiral piles are proof until they are pulled out regardless of the construction conditions, even when the slope tends to collapse until the end. It can be expected to work to deter collapse.
In the above example, the distance between the spiral piles is 1 m, and the distance between each stage when multiple stages are installed is 1 m, and the spiral piles are installed at 1 / m 2. Since the load to be loaded changes, it is necessary to change the number of spiral piles per unit area as appropriate according to the slope and height.
FIG. 6 is a front view for explaining a construction example.
First stage: 18.5m, 20 spiral piles, stainless steel tube 4m x 4 + 2.5m as connecting material
2nd stage: 17.5m, 19 spiral piles, stainless steel tube 4m x 4 + 1.5m as connecting material
Third stage: 16.0m, 17 spiral piles, stainless steel tube 4m x 4 as connecting material
4th stage: 16.0m, 16 spiral piles, stainless steel pipe 4m x 4 as connecting material
5th stage: 8.0m, 8 spiral piles, stainless steel tube 4m x 2 as connecting material

After constructing a series of spiral piles as described above, construct a green lining, mortar, concrete, etc., and bury the head and connecting materials, or cap the spiral pile head ( (Not shown) prevents damages such as maintenance after construction and mowing.
Fig. 7 shows a series of works such as greening, mortar, concrete work, etc. on the slope after a series of constructions such as driving the pile 1 into the slope and reinforcing the slope as described above. The cross-sectional state of the slope where the construction 7 is laid and the spiral pile 1 head and the connecting material 2 are buried is shown schematically. Various types of slope lining 8 can be selected depending on the surrounding environment and the strength of the slope (the degree of fear of collapse). For example, there is a high possibility of collapse (the slope ground is fragile or the slope is steep). In some cases, the lining 8 is laid by spraying strong mortar or concrete. When these mortars and concrete sprays are constructed, they are usually sprayed after a lath wire mesh (not shown) is stretched, and in this case, the connecting material for the spiral pile is not necessarily required.

  In addition, although illustration is omitted, after the above-described spiral pile is constructed on the slope, the pile 1 is used as an anchor material, and materials such as metals, minerals, and chemicals for the purpose of suppressing the growth of miscellaneous trees and weeds, and organic By fixing materials such as mats such as palm fiber and wood chip laminated wood, wood chips, etc. to the slope, it is possible to prevent the surface erosion of the slope and to reduce the grass cutting work of the slope.

In addition, when emphasizing the landscape of the slope, after driving the above-mentioned spiral pile 1 into the slope and reinforcing the slope, various greening works may be laid as the slope lining 8 it can. For example, it is effective to lay a greening method such as thick layer base material spraying method or attaching a greening material with plant seeds, fertilizer or the like attached to a net or the like.
As the above method, especially greening, covers the spiral pile and connecting material, when performing slope maintenance, that is, mowing, there is no protrusion such as the spiral pile, and the cutting is done. Maintenance work is safe without damaging the blades of the machine.

  As another example of the shape of the spiral pile described in the above embodiment, as shown in FIG. 2 (c), an auger rod having a spiral shaped wing can also be used as the spiral pile of the present invention. In this case, it is possible to perform mechanical construction when driving, and it is possible to construct a helical pile with a greater depth in a shorter time.

  As the shape of the head of the spiral pile, in addition to the above example, the spiral shape as it is as the head, the one bent into an L shape, or bolted or screwed in by a welding tool Various shapes such as straight and unprocessed can be implemented, and in accordance with these shapes, the pipe is inserted into the curved part formed on the head of the above-mentioned spiral pile and rotated to drive the spiral pile In addition to the method, it can be carried out by driving using a rotary machine such as a portable drill. If such a method is adopted, the speed of construction can be increased, and the spiral pile can be driven into harder ground, and the effect of the spiral pile can be exhibited more reliably.

  As for the length of the helical pile, in addition to the length of about 60 cm, a length of 50 cm or more and less than 2 m can be applied. From the workability and effective suppression depth of the ground of the pile, preferably about 80 cm to 1.5 m. Is desirable.

In addition to the lateral connection as in the above embodiment, the spiral pile can be connected in the vertical direction, the diagonal direction, or a combination of these, thereby ensuring the connectivity of the spiral pile more reliably. By doing so, the reinforcing effect of the slope can be enhanced.
As for the connecting material, metal or resin rods, pipes or wires (including stranded wires), etc. can be used in addition to the above aluminum tubes and stainless steel tubes. A shape suitable for the site conditions can be selected as appropriate depending on the surface gradient, the hardness of the ground, and the like.

It is a conceptual diagram explaining the slope stabilization 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. It is sectional drawing of the slope which laid the law lining.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spiral pile 2 Connecting material 3 Surface layer part 4 Deep layer part 5 Fixed band 6 Attachment pipe 7 Adhesive 8 Method lining

Claims (3)

  A slope stabilization method characterized by reinforcing the slope by driving a plurality of helical piles into the slope at predetermined intervals.   A plurality of helical piles are driven into the contour at predetermined intervals, and the head of each spiral pile is connected with a connecting material in the contour, longitudinal direction or diagonal direction to reinforce the slope. Slope stabilization method.   A slope stabilization method, wherein a slope lining is laid on the slope where the slope stabilization method according to any one of claims 1 and 2 is applied.

Images