JP2768151B2 - Landslide prevention structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a landslide prevention structure, and more particularly to a landslide prevention structure comprising a plurality of prevention piles driven from a ground surface through a landslide surface.

[0002]

2. Description of the Related Art A landslide generally refers to a phenomenon in which a part of land slides due to groundwater or the like, and moves accordingly. A part of the soil having a low shear resistance is used as a landslide surface.
Along with this, the upper mass is slid down.

As a method of preventing such landslides, a method of suppressing landslides by changing the natural phenomena of the landslide occurrence area, that is, by removing or reducing factors such as groundwater that tends to cause landslides, has conventionally been used. When,
A deterrent method of stopping a landslide by the deterrent of a structure such as a pile body driven into the ground by a pile driver or a shaft is mainly adopted.

[0004] As an example of the deterrent method, a landslide deterrent structure comprising a number of piles driven from the ground surface through a landslide surface, ie, a number of deterrent piles, is known. As shown in FIG. 4, the conventional restraining structure 20 has a large number of restraining piles 21 arranged linearly in a row or a plurality of rows in a direction perpendicular to the landslide direction X. , The pile head is integrated by a connecting portion 22 having a truss structure or the like.

[0005]

However, in the conventional landslide prevention structure using the prevention stakes, since the sliding load is generally large in the central portion where the sliding depth is the largest, the load on the stakes arranged in the center is increased. And the load carried by each pile becomes unbalanced, so that a large number of deterrent piles cannot efficiently and uniformly support the landslide load as an integrated structure, and the structure becomes larger than necessary. There was a problem.

Further, since each restraint pile is a cantilever supported by the ground below the sliding surface, there is a problem that a large rigidity is required. In order to cope with this, a load is supported at the upper end of the restraint pile. There is a way to do it,
In the method of connecting the pile head with a truss structure or the like, the pile head does not have enough strength to support the upper end of the deterrent pile against the tensile load generated on the downstream side of the connection part, and the upper end of the deterrent pile is anchored. In the method of supporting, the slope of the landslide surface is generally gentle, so that it is difficult to use the anchor together. Therefore, there is a problem that the rigidity of the restraint pile cannot be reduced by any of the methods.

The present invention has been made in order to solve the above-mentioned problems, and in a landslide suppression structure using a deterrent pile, it is possible to achieve a rational structure in which a large number of deterrent piles can uniformly and uniformly receive a sliding load. It aims at providing an economical landslide prevention structure.

Another object of the present invention is to provide a landslide prevention structure capable of reducing the rigidity of the restraint pile and reducing its scale by firmly supporting the upper end of the restraint pile.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned object, and the gist of the present invention is to provide a landslide prevention structure comprising a large number of prevention piles driven from a ground surface through a landslide surface. A landslide prevention structure is characterized in that a number of deterrent piles are arranged in an arch shape protruding upstream with respect to a landslide direction, and the pile heads are integrally connected by an arch-shaped connecting member.

Here, the deterrent pile refers to a pillar such as a steel pipe pile, a concrete pile, or a rod-shaped member such as a reinforced steel rod, a steel pipe, or the like, which has been driven into the ground by a pile driver or a shaft. Say. The arch-shaped connecting member can be constructed, for example, by winding a pile head and pouring concrete into an arch shape, and attaching a preformed arch-shaped steel member or the like to the pile head. May be formed.

Further, in the landslide suppressing structure according to the present invention, the connecting member may include a fixing portion formed along an arched arrangement line of the plurality of suppressing piles, and a downstream side in the landslide direction from the fixing portion. In addition, it is preferable that the load supporting portion is formed to have an arch shape and have a predetermined cross-sectional area and to support a landslide load applied to the restraining pile as a compressive force.
Here, the predetermined cross-sectional area is appropriately designed in consideration of the landslide load, the radius of curvature of the arch shape, the number of restraining piles, and the like, according to the compression load to be taken.

[0012]

According to the landslide suppressing structure of the present invention having the above-described structure, a large number of suppressing piles which are arranged continuously in an arch shape and have a pile head integrally connected are integrally formed such that the piles exert forces on each other as a whole. A structure can be formed and the landslide load can be evenly distributed.

The arch-shaped connecting member reduces the rigidity of the deterrent pile by supporting the landslide load as a compressive load even at the upper end of the deterrent pile due to the arch effect. Further, if the connecting member is provided with a load supporting portion having a predetermined cross-sectional area protruding from the fixing portion, the landslide load can be more firmly supported and the scale of the deterrent pile can be further simplified.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a landslide suppressing structure 10 according to this embodiment.
As shown in the figure, the arresting pile 11 is constructed to suppress the landslide in the X direction in the landslide range A, and protrudes upstream in the X direction and is continuously arched at predetermined intervals in an arch shape. And an arch-shaped connecting member 12 that integrally connects the pile heads of the deterrent piles 11.
The deterrent pile 11 is, for example, a steel pipe pile that is driven into the ground by various pile driving works, and is a large-scale pile 15 located at both ends of the arch-shaped deterrent structure 10 and a small-scale pile 16 located between them. Are used. The large-scale pile 15 has a diameter several times larger than that of the small-scale pile 16, is driven out of the landslide range A, and suffices to receive the reaction force transmitted through the arch-shaped connecting member 12. It has sufficient strength and rigidity. On the other hand, the small-scale pile 16 penetrates the landslide surface C from the ground surface B to the ground 14 below the landslide area A within the landslide range A, and the lower end thereof is fixed to the lower ground 14 as shown in FIG. To support landslide loads.

As shown in FIGS. 1 and 3, the upper end of the restraint pile 11, ie, the pile head, is
2 are integrally connected. Arch-shaped connecting member 12
Includes the pile head of the small-scale pile 16 and the large-scale pile 1
5 and integrated with concrete to form an arch. The connecting member 12 has a small-thickness fixed portion 17 constructed along the arch-shaped arrangement line of the small-scale pile 16 continuously cast, and projects from the fixed portion 17 to the downstream side in the landslide direction X. Thick load support 18
And is constituted by. The fixing part 17 is used for the deterrent pile 11.
Has the function of fixing in the state of being integrally connected to the arch,
On the other hand, the load supporting portion 18 has a function of supporting a landslide load applied to the small-scale pile 16 as a compressive load by an arch effect, and transmitting this to the large-scale pile 15 at both ends. In addition, the load supporting portion 18 has a required cross-sectional area corresponding to a compressive load appropriately designed in consideration of a compressive load to be taken, that is, a design landslide load, a radius of curvature of an arch shape, the number of the restraining piles 11, and the like. The cross-sectional shape such as width and height is determined.

In the landslide suppressing structure 10 according to the present embodiment having the above-described structure, the lower end of the small-scale pile 16 is
4, the landslide load is supported, and the upper end is integrally connected in an arch shape by the connecting member 12, so that the upper end is supported by the arch effect of the connecting member 12. Further, the deterrent piles 11 mutually exert a force via the connecting member 12, whereby the deterrent piles 11 evenly support the landslide load.

[0018]

As described above in detail, the landslide suppression structure of the present invention has a large number of suppression piles arranged in an arch shape projecting upstream with respect to the landslide direction, and the pile head has an arch shape. Because the connecting members are integrally connected with each other, a large number of deterrent piles uniformly and uniformly share the sliding load via the connecting members, thereby reducing the size of the deterrent piles or reducing the number of cast-in piles, which is reasonable and economical. It is possible to construct a landslide deterrent structure. In addition, since the landslide load is also supported at the upper end of the deterrent pile by the arch effect of the connecting member, the rigidity of the deterrent pile can be reduced, so that the landslide deterrent structure can be configured more economically.

[Brief description of the drawings]

FIG. 1A is an explanatory diagram showing a configuration of a landslide suppression structure according to the present invention. (B) is an enlarged view of a D part of (A).

FIG. 2 is a sectional view taken along the line YY of FIG.

FIG. 3 is a cutaway perspective view showing a configuration of a connecting member.

FIG. 4 is an explanatory view of a conventional landslide prevention structure including a number of prevention piles.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Landslide suppression structure 11 Suppression pile 12 Connecting material 17 Fixed part 18 Load support part X Landslide direction

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-51336 (JP, A) JP-A-57-54632 (JP, A) JP-A-58-17931 (JP, A) JP-A-5-17931 171654 (JP, A) JP-A-50-127401 (JP, A) JP-B-47-41561 (JP, B1) (58) Fields investigated (Int. Cl. ⁶ , DB name) E02D 17/20 106

Claims (2)

(57) [Claims] 1. A landslide suppression structure comprising a number of deterrent piles driven from a ground surface through a landslide surface, wherein the plurality of deterrent piles are arranged in an arch shape protruding upstream with respect to a landslide direction. A landslide prevention structure characterized in that pile heads are integrally connected by arch-shaped connecting members. 2. A fixed portion formed along an arc-shaped arrangement line of the plurality of deterrent piles, wherein the connecting member is provided in an arched and predetermined shape on the downstream side in the landslide direction from the fixed portion. The landslide prevention structure according to claim 1, further comprising a load supporting portion projecting to have a cross-sectional area and supporting a landslide load applied to the prevention pile as a compressive force.