JPH0931996A - Method for driving landslide-preventing pile, anchor base and landslide preventing pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily drive a pile in an optional position. SOLUTION: On driving and anchoring a landslide-preventing pile to a natural ground G, the pile body 3 is driven into the ground in a specified position, an anchor hole H is drilled into the natural ground G from the upper side of the driven pile body 3, and an anchor 2 is inserted into the anchor hole H. After the anchor 2 is fixed firm to the natural ground G with foot protection applied to its tip, the anchor 2 is anchored, being fixed to the head of the pile body 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a landslide prevention pile, an anchor pedestal for fixing an anchor to the pile, and a structure of the landslide prevention pile. The present invention relates to a method of constructing a landslide prevention pile moored in a mountain, an anchor pedestal for fixing an anchor to a pile body, and a landslide prevention pile moored by an anchor.

[0002]

2. Description of the Related Art A conventional landslide prevention pile construction process will be described with reference to the drawings. FIG. 5 is a vertical cross-sectional view of the ground at the built-in position of the landslide prevention pile, and FIG. 6 is a plan view of a part of the built-in pile row. The pile main body 3 of the landslide prevention pile 1 is placed at a predetermined placing position of the natural ground G, and the periphery of the pile placing position is continuously deleted for mounting the abdomen 10 and further, this natural ground G is deleted. The anchor hole H is drilled by being positioned between the pile main bodies 3 of the part S, the anchor 2 is inserted into this anchor hole H, and the grout material 7 is injected into this anchor hole H, and the anchor 2
To fix the anchor 2 to the ground G. afterwards,
On the upper part of the pile body 3, a bellows raising member 10 made of H-shaped steel or the like is aligned with the position of the anchor 2 and welded to the bracket 1
It is attached via 1 and the pile main body 3 is connected. After the anchor 2 is inserted into the anchor insertion hole of the anchor pedestal 4 in the bellows 10, the anchor pedestal 4 is attached to the bellows 10 by welding or the like, and the anchor nut 2a as an anchor attachment mechanism is screwed into the anchor 2. Then, the anchor 2 is fixed to the pile main body 3 via the abutment 10 by tightening. (When a wire is used for the anchor 2, wedges may be used instead of the anchor nut 2a.) After that, generally, both 10 and the anchor pedestal 4 are covered with concrete to prevent corrosion. The pile main body 3 used for this purpose is not specially processed for attaching an anchor, and the anchor base 4 used is one that is formed to be attached to the bellows 10.

[0003]

In the above-mentioned prior art, in order to attach the bellows to the anchor to attach the anchor base for mooring the pile, the ground near the bellows mounting portion of the pile body is deleted. There must be. Also, the shape steel used for waving is usually a linear material, the piles must be arranged in a straight line, and since the shape steel used for waving is of a fixed length, the waving connection A troublesome problem in construction occurs that is required. As described above, there is a problem that the accuracy of the placement position of the pile main body is required, and the interval between the piles is restricted, and when the piles are to be installed at a narrow interval, the staggered arrangement must be used. However, in this case, there is a problem that it is difficult to attach the abdomen and at the same time, it is necessary to excavate the anchor hole in the gap between the piles, which makes it difficult to excavate the anchor hole. In particular, when landslide prevention piles are to be installed on the hillside, the arrangement of the piles must be curved, and it is necessary to set up abdomen for each adjacent pile, which complicates the construction. There was a problem that became. Furthermore, the anchor fixing part including the abdomen and the anchor pedestal is coated with concrete for corrosion protection, but the concrete coating amount is large, which is economically problematic and there is also a problem in landscape. Therefore, an object of a first invention of the present invention is to solve the above problems and provide a method of erection of a landslide prevention pile, which enables a pile to be easily erected at an arbitrary position, A second object of the present invention is to solve the above problems, in which piles installed at arbitrary positions do not require much excavation work and a small amount of concrete is coated for corrosion prevention. Without field welding,
An object of the third invention is to provide an anchor pedestal for attaching an anchor that can easily fix an anchor to a pile, and an object of the third invention is to solve the above problems without difficulty and to simplify the construction. The purpose of the present invention is to provide a landslide prevention pile that allows the pile to be built at any position and moored.

[0004]

[Means for Solving the Problems] The feature means of the first invention of the present invention for the above object is to drive a pile main body at a predetermined position, and from above the driven pile main body to the ground level. Excavating the anchor hole, inserting the anchor into the anchor hole, fixing the tip of the anchor to the ground and fixing it, and then anchoring the anchor to the head of the pile body for mooring. . In order to fix the anchor to the head of the pile body, it is better to fix the anchor via an anchor pedestal attached to a pedestal fixing portion provided on the head of the pile body. Further, the second aspect of the present invention is characterized in that it has an attachment portion that can be fixed to a pedestal fixing portion provided in the pile body, and that the anchor insertion hole is provided according to the anchor inclination angle, and the anchor insertion hole. It has a locking surface part capable of locking the anchoring mechanism of the anchor inserted through. The mounting portion is provided with an outer fitting portion that can be fitted and fixed on the outer peripheral surface of the pedestal fixing portion, or an inner fitting portion that can be fitted and fixed on the inner peripheral surface of the cylindrical pedestal fixing portion. It is even better to provide. Further, a characteristic configuration of a third invention of the present invention is configured by including a pile main body and the anchor pedestal of the second invention arranged on the head side thereof, and the head of the pile main body is provided with: The point is that a pedestal fixing portion that can fix the anchor pedestal is provided. It is more preferable to provide the pedestal fixing portion on the outer peripheral portion of the head portion of the pile main body or to provide the pedestal fixing portion on the inner peripheral portion of the cylindrical head portion of the pile main body.

[0005]

Therefore, according to the characteristic means of the first aspect of the "method of constructing a landslide suppressing pile" of the first invention of the present invention, (a) an anchor is provided from above the driven pile body to the natural ground. Since the holes are excavated, the anchor holes can be easily excavated, and there are no restrictions on the placement of the piles due to the excavation of the anchor holes. Since the anchors are fixed and moored to the heads of the pile main bodies, the anchors can be easily fixed, there is no processing for the embedded portions of the pile main bodies, and there is no limitation on the arrangement.
(c) Furthermore, as in the past, a bellows was attached to the pile body,
It is not necessary to excavate a large amount around the pile around the anchor pedestal in order to attach the anchor pedestal to the abdomen, and the concrete coating amount for corrosion prevention can be reduced.
By the means described in claim 2, (d) the attachment of the anchor to the head of the pile body is easy and reliable. Also,
According to the characteristic configuration of the third aspect of the "anchor pedestal" of the second invention, (e) if the pedestal fixing portion is provided in advance on the head of the pile body, the anchor at the landslide prevention pile construction site. No special processing such as on-site welding to the pile body and anchor pedestal for mounting is required. (f) Furthermore, since the anchor can be fixed to the head of the pile body, the anchor hole can be easily drilled. In addition, if the configuration of claim 4 is adopted,
(g) If the anchor pedestal is formed in advance on the pedestal fixing part of the pile main body, the anchor pedestal can be attached to the head of the pile main body without any special processing at the landslide prevention pile construction site. You can easily fix the anchor just by fitting it. . Further, according to the configuration of claim 5, (h) if an anchor pedestal is formed in advance in the pedestal fixing portion of the pile main body so that special processing can be performed at a landslide prevention pile construction site. The anchor can be easily fixed by simply fitting the anchor pedestal into the head of the pile body without using the (i)
In particular, if the pile main body is tubular, it is possible to secure the length of the inner fitting portion of the anchor pedestal that is sufficient to secure the strength of anchor fixing. According to the characteristic configuration of the sixth aspect of the "land slide prevention pile" of the third invention, (j) it is sufficient to fix the anchor pedestal to the pile main body by a predetermined fixing method. The same effect as (c) is brought about. According to the configuration of claim 7, (k) since the anchor pedestal is preliminarily formed on the pile main body so that the anchor pedestal can be externally fitted and fixed, the landslide can be easily performed only by fixing the anchor after root consolidation to the anchor pedestal. The restraint pile can be moored, and when the construction of claim 8 is provided, the same action as (l) above (k) is brought about and at the same time the same action as (i) above is brought about. Be done.

[0006]

As a result of the above, by means of claim 1 of the "method of constructing a landslide prevention pile" of the first invention,
By solving the above problems, by (a) to (c), the amount of on-site work such as rock excavation work, concrete covering work of anchor fixing parts, and abdomen work and the amount of earth excavated soil are reduced,
The landslide prevention pile can be easily installed and moored at any position. By the means described in claim 2,
By (d) above, it is possible to make the anchor installation easier and more secure. Further, by the constitution of claim 3 of the "anchor pedestal" of the second invention, the above problem is solved, and the anchor can be easily fixed to the pile by (e) without extra civil engineering work. It is possible to
Further, according to the above (f), the pile can be erected and moored at an arbitrary position. According to the structure of claim 4, the
With (g), it is possible to easily moor the landslide-preventing pile without requiring special on-site processing of the pile, and also according to the configuration of claim 5, the same applies according to (h) above. In addition, it is possible to easily moor the landslide-preventing piles without requiring any special on-site processing of the piles. In particular, the mooring of the landslide-preventing piles can be further ensured by the above (i). And the said subject is solved by the structure of said Claim 6 of "the landslide prevention pile" of said 3rd invention, and the landslide prevention pile is easily erected and moored at an arbitrary position by said (j). It is possible. The claim 7
With the configuration described above, by the (k), similarly, it is possible to easily build and moor the landslide prevention pile at an arbitrary position, and further, according to the configuration of the claim 8,
By (l), mooring of the landslide prevention pile can be further ensured.

[0007]

[Example] Using the restraint pile and the anchor pedestal of the present invention,
A method of installing a landslide prevention pile (hereinafter, simply referred to as a prevention pile) of the present invention will be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a natural ground G showing an example of a process of constructing a restraint pile using each example of the restraint pile 1 and the anchor pedestal 4 of the present invention. FIG.
As shown in (a), the pile building holes are drilled in the natural ground G, and the pile main body 3 is sequentially built. Then, as shown in FIG.
A part S above the slope of the ground G of each pile main body 3 that has been built up is deleted, the head of the pile main body 3 is exposed, and anchor holes H are excavated in the natural ground G from directly above them, respectively. Pedestal 4
To the pedestal fixing portion 3a provided on the outer periphery of the upper end of each pile body 3 by externally fitting the outer fitting portion 5 which is a mounting portion 4c to the pile body 3 provided at the lower part of the pile body 3 respectively. Stick to it. afterwards,
After inserting the anchors 2 into the anchor holes H while inserting the respective anchors 2 into the anchor insertion holes 4a from the tip ends, the grout material 7 is injected into the anchor holes H and the anchors 2 are inserted.
Each of the anchors 2 is fixed to each anchor pedestal 4 by screwing a nut 2a, which is a fastening mechanism thereof, to each anchor 2 and tightened on the locking surface portion 4b of each anchor pedestal 4 to fix each anchor 2 to each anchor pedestal 4, Mooring the main body 3. Then, mortar is injected around the pile body 3, concrete is also placed in the pile body 3, and the anchor 2 is tensioned. Then, as shown in FIG. 3C, the head of each restraint pile 1 is covered with concrete for corrosion protection. Reference numeral R in FIG. 1C indicates a concrete covering portion. FIG. 2 is a perspective view showing a partial cross-section showing a part of the restraint pile row under the condition before concrete coating of FIG. As shown in the figure, if the construction method of the present invention is used, each pile 1 can be applied even when it cannot be arranged on the contour lines (E1, E2, E3 in the figure respectively indicate the contour lines).
Further, by using the anchor pedestal of the present invention, it is possible to securely moor the restraint piles at arbitrary intervals and in arbitrary arrangement while minimizing the work on the site for attaching the anchors, and to sufficiently achieve the intended purpose of the restraint piles. To be able to fulfill. Furthermore, by using the restraint pile of the present invention, the constraint of the process after placing the pile body can be eliminated, the anchor can be fixed and moored at any position, and the construction is also simple. In the above-mentioned embodiment, the anchor pedestal is attached to the pile body after fixing the anchor to the anchor hole, but it is also easy to insert and fix the anchor in the anchor hole after fixing the anchor pedestal to the pile body. is there.

[Other Embodiments] The embodiments of the present invention are not limited to the above-described embodiments, but include different means or configurations having the same operations as the above-mentioned means or configurations. As an example of a part thereof, <1> the anchor pedestal mounting portion 4c is fitted into the pedestal fixing portion 3a provided on the cylindrical inner peripheral surface of the upper end portion of the pile body 3 as shown in FIG. It may be configured like the inner fitting portion 6. The inner fitting portion 6 is not limited to the cross-shaped cross section shown in the drawing, and may be any shape that can be fitted into the pedestal fixing portion 3a, such as a square shape, a square shape, an H shape, a cylindrical shape, and a cylindrical shape. . In particular, if the upper portion of the inner fitting portion 6 has a shape that seals the upper end portion of the pile body 3, it is possible to prevent water from entering the inside of the pile body 3 from above, as in the case of the above-described embodiment. It is possible to prevent water from accumulating and corroding inside the pile body 3. <2> The anchor pedestal may be formed by welding steel plates as shown in FIG. Steel plate welding is cheaper to manufacture than casting anchor material. <3> The anchor pedestal may be welded to the pile body, and in this case, even if the attachment portion is simply formed so as to be engageable with the pile body, the anchor pedestal is used for welding. It is convenient for positioning the anchor base on the pile body. <4> The anchor fixing mechanism is not limited to the nut, and may be any structure that can be locked and fixed to the anchor pedestal. For example, a structure in which an anchor is sandwiched and fixed can be adopted. <5> The anchor locking surface portion does not need to be a flat surface as long as it can be locked by the anchoring mechanism of the anchor, for example, a surface formed with a radial step also serving as a nut detent. Good. <6> In using the anchor pedestal and the restraining pile of the present invention, it is not always necessary to follow the process of the above-described embodiment, and for example, an anchor hole is excavated from directly above the pile main body to the natural ground, and the anchor is inserted into this. After fixing, the anchor pedestal may be fixed to the pile main body while inserting the anchor into the anchor insertion hole of the anchor pedestal, and then the anchor may be fixed to the anchor pedestal. <7> Also, instead of individually fixing the anchors to the anchor holes, a plurality of anchors may be fixed to the anchor holes via separate members.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of the ground at a pile driving position for explaining the construction of a restraint pile according to the present invention.

FIG. 2 is a plan view showing a part of a row of restraint piles for explaining the features of the construction of restraint piles according to the present invention.

FIG. 3 is a vertical sectional view for explaining another embodiment of the anchor base of the present invention.

FIG. 4 is a vertical sectional view for explaining another embodiment of the anchor base of the present invention.

FIG. 5 is a vertical cross-sectional view of the ground showing the construction of a conventional restraint pile.

FIG. 6 is a plan view of a rock mass showing a part of a conventional restraint pile row.

[Explanation of symbols] 1 pile 2 anchor 3 pile body 3a pedestal fixing part 4 anchor pedestal 4a anchor insertion hole of anchor pedestal 4b anchoring surface part of anchor pedestal 4c anchor pedestal mounting part G rock H anchor hole

Claims (8)

[Claims] 1. An anchor (2) after placing a pile (1)
A method of constructing a landslide prevention pile moored in the ground (G) with (a) placing the pile body (3) at a predetermined position, and (b) installing the pile body (3). An anchor hole (H) is excavated from the top to the ground (G), (c) An anchor (2) is inserted into the anchor hole (H), and (d) a tip of the anchor (2) is ground ( A method of erection of a landslide prevention pile, wherein the anchor (2) is fixed to the head of the pile body (3) and moored after being fixed to G). 2. The anchor (2) is attached to the pile body (3).
The anchor (2) is fixed via an anchor pedestal (4) attached to a pedestal fixing part (3a) provided on the head of the pile main body (3) for fixing to the head of the anchor (2).
How to install the landslide prevention piles described. 3. An anchor insertion hole (4) provided with a mounting portion (4c) that can be fixed to a pedestal fixing portion (3a) provided in the pile main body (3) and provided in accordance with the anchor inclination angle.
a) and a locking surface part (4) capable of locking the locking mechanism (2a) of the anchor (2) inserted in the anchor insertion hole (4a).
b) Anchor pedestal with and. 4. The anchor pedestal according to claim 3, wherein the mounting portion (4c) is provided with an outer fitting portion (5) which can be fitted and fixed on the outer peripheral surface of the pedestal fixing portion (3a). 5. The anchor pedestal according to claim 3, wherein the mounting portion (4c) is provided with an inner fitting portion (6) which can be fitted and fixed on the inner peripheral surface of the cylindrical pedestal fixing portion (3a). 6. The pile main body (3) and the anchor base (4) according to any one of claims 3 to 5, which is arranged on the head side thereof.
A landslide prevention pile, comprising: a pedestal fixing part (3a) capable of fixing the anchor pedestal (4) on the head of the pile body (3). 7. The landslide restraining pile according to claim 6, wherein the pedestal fixing portion (3a) is provided on an outer peripheral portion of a head portion of the pile body (3). 8. The landslide suppressing pile according to claim 6, wherein the pedestal fixing portion (3a) is provided on an inner peripheral portion of a cylindrical head portion of the pile main body (3).