JPH11172634A - Preventing pile for falling mater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the preventing function of falling materials without increasing the number of driven piles by providing a large diameter part having a larger outline dimension than that of the part buried in the ground. SOLUTION: A preventing pile P for falling stones is provided with a pile body 2 made of a cylindrical steel pipe integrally constituted of a part 2A embedded in the ground 1 and an erected part 2B on the ground to receive stones falling along a slope face at the lower side of the slope and prevent them from further falling down. The boundary part of the erected part 2B on the ground from the embedded part 2A is formed to have the same outline dimension with the embedded part 2A. The diameter is formed larger as it goes up to the upper end. The large diameter part 4 is constituted of a first steel pipe 5 having a larger diameter than the steel pipe at the embedded part 2A and a second steel pipe 6 having a larger diameter than the first steel pipe 5. And the pile is also provided with a first joint pipe 7 with different connection sizes having the same diameter joint side with the embedded part 2A at the lower end and the same diameter joint side with the first steel pipe 5 at the upper end and a second joint pipe 8 with different connection sizes having the same diameter joint side with the first steel pipe 5 at the lower end and the same diameter joint side with the second steel pipe 6 at the upper end.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile for preventing falling objects that can be used for receiving falling objects (for example, falling rocks and snow clumps) falling on a slope on a lower side of the slope and suppressing the falling objects. Is a pile for preventing falling objects, which is provided with a pile body integrally provided with a buried portion embedded in the ground and a ground standing portion for receiving falling objects falling along the sloped ground on the lower side of the slope and suppressing the falling. About.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 7 and 8, a pile main body 2 is formed of a steel pipe having a constant outer diameter over its entire length, as shown in FIGS. was there.

[0003]

A method of installing a pile for preventing falling objects of this type will be described with reference to an example of a method generally used. First, a hole for embedding the buried portion in the ground is described. In this method, the pile body is excavated, the pile body is placed in a state where the buried portion is located in the hole, and concrete is filled in a gap between the peripheral wall of the hole and the buried portion and hardened, thereby integrally installing the pile. And, of course, in the above-mentioned hole excavation work and pile body construction work, it is necessary to secure a considerable work space on the ground part, and the construction position of adjacent piles is It must be set with a large separation distance. According to the conventional pile for preventing falling objects described above, since the piles are formed to have the same outer diameter over the entire length of the pile body, in a state where the piles are buried in the ground, the distance between the piles is equal to or more than the predetermined distance. As a result, a gap having a corresponding width dimension is generated, and as a result, the falling object slips through the gap (see FIG. 8), and there is a problem that the fall cannot be easily suppressed. To solve this problem,
It is conceivable to install the piles in a staggered arrangement to reduce the size of the clearance gap for a substantially falling object, but in this case, the number of piles required will increase and the construction cost will increase. There is a point.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a pile for preventing falling objects which can improve the function of suppressing falling objects without increasing the number of piles to be constructed. is there.

[0005]

According to a first aspect of the present invention, there is provided a buried portion buried in the ground and a ground stand for receiving a fallen object falling along the slope on the lower side of the slope to suppress the fall. In a pile for preventing a fallen object provided with a pile body integrally provided with an installation portion, a large-diameter portion having an outer diameter larger than the outer diameter of the buried portion is provided on the ground standing portion. There.

A characteristic feature of the invention according to claim 2 is that the outer peripheral shape of the virtual cut surface orthogonal to the axis at the large diameter portion is circular or substantially circular.

According to the first aspect of the present invention, a large-diameter portion having an outer diameter larger than the outer diameter of the buried portion is provided in the ground standing portion.
Even if the construction pitch between the buried part of another pile installed adjacently and the buried part of the pile is set as before, the gap dimension between the ground standing parts of both piles is the large diameter part This makes it easier to prevent falling objects from slipping through the gap. In other words, the pile installation pitch is set to an extent that a necessary space can be secured, and the pile installation can be performed efficiently, but the effect of suppressing falling objects can be improved. Furthermore, as described above, it is possible to reduce the number of constructions, as compared with staggered arrangements to reduce the actual slip-through width, and it is possible to shorten both the construction period and the construction cost. It becomes possible.

According to the characteristic configuration of the second aspect of the present invention, in addition to the effect of the first aspect of the invention, the outer peripheral portion of the virtual cutting surface orthogonal to the axis at the large diameter portion can be achieved. Since the shape is circular or almost circular, the contact force of the falling object on the pile is divided into a component force in the direction toward the pile central axis and a component force in the circular tangential direction. Therefore, even if a falling object comes into contact with the pile from either the left or right direction, the same dispersion occurs, and the directionality of the counterforce can be reduced. In other words, it is possible to stably exert a deterrent effect even on a falling object assumed to fall from an unspecified direction. This also means, for example,
Compared with a pile that has a large diameter section consisting of laterally extending wings on the outer periphery of the pile, it is easier to ease the pile from being twisted around the axis by the contact force of falling objects, and the stability of the pile itself It also leads to the improvement and the reduction of the supporting force of the pile supporting portion.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, portions denoted by the same reference numerals as those of the conventional example indicate the same or corresponding portions.

FIG. 1 shows a situation where a rockfall prevention pile (hereinafter simply referred to as a “pile”) P, which is an example of a fallen object prevention pile according to the present invention, is installed below a slope K. A plurality of piles P are arranged side by side at intervals along the depth direction of the paper surface of FIG.
), And a falling rock (an example of the falling object 3) S falling along the sloped ground K is to be received.

As shown in FIGS. 2 and 4, the pile P has a buried portion 2A buried in the ground 1 and a ground standing portion for receiving a falling rock S falling along the sloped ground K on the lower side of the slope and suppressing the fall. 2B and a pile main body 2 made of a cylindrical steel pipe integrally provided. The ground standing portion 2B has a boundary portion with the buried portion 2A having the same outer diameter as the buried portion 2A, and has a larger diameter toward the upper end. That is, for the pile according to the present embodiment, the ground standing portion 2B
The whole corresponds to the large diameter portion 4. As shown in FIG. 2, the large-diameter portion 4 has a first steel pipe 5 larger in diameter than the steel pipe used in the buried portion 2A, a second steel pipe 6 larger in diameter than the first steel pipe 5, and a lower end. A first different-diameter joint pipe 7 having a joint portion having the same diameter as the buried portion 2A at the upper portion and a joint portion having the same diameter as the first steel pipe 5 at the upper end, and having the same diameter as the first steel pipe 5 at the lower end. And a second joint pipe 8 having a joint having the same diameter as the second steel pipe 6 at the upper end. The buried portion 2A, the first different diameter joint pipe 7, the first steel pipe 5, the second different diameter joint pipe 8, and the second steel pipe 6 are connected by welding (or formed by integral casting). The pipes constituting the large-diameter portion 4 are formed to be thinner as they are located above, and in consideration of the fact that the maximum bending stress acts on the root of the above-ground standing portion 2B at the time of rockfall suppression. In addition, the amount of steel material is reduced toward the upper side where the stress is presumed to be small, thereby improving the economic efficiency.

The outline of the method for installing the pile P described in the present embodiment will be described. [1] A buried hole having a diameter slightly larger than the buried portion 2A is formed in the installation target portion. [2] The pile P is arranged so that the buried portion 2A is accommodated in the buried hole. [3] Concrete is filled and hardened between the burying hole and the outer peripheral portion of the burying portion 2A. [4] Then, a plurality of rockfall prevention zones R are sequentially arranged in parallel at intervals along the contour line direction of the sloped land K.
Can be formed.

FIG. 4 is a front view of the rock fall prevention zone R. As can be seen, the large-diameter portion 4 of each pile is erected on the ground, so that the gap between the piles on the ground is measured. Becomes smaller and it becomes easier to block rockfall.

[Another Embodiment] Another embodiment will be described below.

<1> A pile for preventing falling objects according to the present invention,
The present invention is not limited to the case where the fallen object described in the above embodiment is a falling rock. For example, the fallen object may be a lump of snow and applied to avalanche prevention. In short, the present invention can be applied to a case where it is necessary to receive a fallen object falling along the sloped ground on the lower side of the slope and suppress the fall. <2> As described in the above embodiment, the large diameter portion is not limited to one having a gradually increased diameter.
For example, as shown in FIG. 5, the diameter may be gradually increased. Further, as shown in FIG. 6, a large diameter portion which is locally enlarged may be used. In short, it suffices if the buried portion has an outer diameter larger than the outer diameter of the buried portion, and these are collectively referred to as a large diameter portion. <3> For the pile body, for example, it is also possible to form an upper lid on the one described in the previous embodiment, and to suppress the corrosion of the pile body by sealing the inner space of the pile main body with the upper lid. It will be easier. In addition, the inner space of the pile main body may be hollow as described in the previous embodiment, or may be filled with concrete, or may be filled with excavated residual soil generated at the time of excavation, for example. Can be achieved. In particular, when the latter excavated soil is filled, it is possible to reduce the amount of industrial waste generated from the construction site and to proceed with the construction cleanly.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a cross-sectional side view showing an installation state of a pile.

FIG. 2 is a side sectional view showing a pile.

FIG. 3 is a top view showing the installation status of piles.

FIG. 4 is a front view showing an installation state of a pile.

FIG. 5 is a sectional side view showing a pile according to another embodiment.

FIG. 6 is a side sectional view showing a pile according to another embodiment.

FIG. 7 is a sectional side view showing a conventional pile installation state.

FIG. 8 is a top view showing the installation status of a conventional pile.

[Explanation of symbols]

 Reference Signs List 1 ground 2 pile body 2A buried part 2B erected part on the ground 3 fallen object 4 large diameter part K sloped ground

Claims (2)

[Claims] A buried part (2) buried in a ground (1)
A) and a pile body (2) integrally provided with a ground standing portion (2B) for receiving a falling object (3) falling along the sloped ground (K) on the lower side of the slope and suppressing the falling object (3B). A falling object deterrent pile, wherein a large diameter part (4) formed with an outer diameter larger than an outer diameter of the buried part (2A) is provided on the ground standing part (2B). For piles. 2. The fallen object preventing pile according to claim 1, wherein the outer peripheral shape of the virtual cut surface orthogonal to the axis in the large diameter portion is circular or substantially circular.