JP2561066Y2 - Structure for anchoring head of ground anchor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for anchoring a head of a ground buried anchor used in ground anchor construction for the purpose of retaining a mountain, preventing landslides, stabilizing a slope, and reinforcing various structures.

[0002]

2. Description of the Related Art For example, in the construction of a ground anchor, a PC steel strand tensioned by a tensioning device or the like is fixed by a fixing tool composed of a combination of an anchor head and a fixing wedge while maintaining a predetermined load. It is fixed to the ground via an anchor plate (support plate). The end (head) of the PC steel strand anchored by the anchor is usually
It is covered together with the anchor head by a head cap (also referred to as an oil cap) whose main purpose is rust prevention and protection.

Here, a pair of adjustment plates for compensating for the deviation of the angle of the anchor head relative to the anchor plate and fixing the anchor head in a stable state are interposed between the anchor plate and the anchor head.
The pair of adjust plates formed separately at the upper and lower portions are formed to have non-uniform thicknesses formed by slopes with respect to the base surface. For example, the two slopes are opposed to and joined to each other. And, by the change in the angle between the two base surfaces, which is obtained by the difference in the combination position due to the rotation or the like, the deviation of the angle of the anchor head with respect to the anchor plate is compensated under the pair of adjust plates.

In such a configuration, since the set angle can be finely adjusted by changing the combination position of the upper and lower adjust plates, stable anchoring of the anchor head, that is, the PC stranded wire can be easily obtained. .

[0005]

However, in the known head anchoring structure of a ground burying anchor, a pair of adjust plates are interposed between the anchor plate and the anchor head, and protect the PC stranded wire. An outer sheath (also called an SJ straight sheath), a head cap (also called an oil cap), and the like are further provided.
In particular, since the outer sheath has a joint plate called an SJ plate for joining one end to an anchor head or the like without a gap, an increase in the number of parts cannot be avoided.

The increase in the number of parts is caused by
It is not preferable because the workability is reduced, the weight is increased, and the price is increased due to the complicated configuration.

Further, in the known configuration, the outer sheath formed separately in advance is merely provided in combination with an adjust plate, an anchor head, and the like.
Although the outer sheath has the joint plate, there is a possibility that a gap may be formed between the outer sheath and the adjust plate, the anchor head, or the like. When such a gap occurs, rainwater or the like enters the outer sheath from the gap, and rust caused by the adhesion of the rainwater or the like is generated on the PC steel strand or the like. Inevitable.

An object of the present invention is to provide a head anchoring structure for a ground buried anchor which simplifies an assembling operation and the like by reducing the number of parts and enhances a rust prevention effect of a PC steel strand or the like.

[0009]

According to the present invention, an outer sheath is integrally provided on one of the upper and lower adjust plates by fixing one end to the upper or lower adjust plate. ing. The head cap can be attached to the upper adjustment plate by a pair of screw portions that are screwed together.

[0010]

According to this structure, a joint plate becomes unnecessary, and the number of parts is reduced. And one of the upper and lower adjust plates and the outer sheath,
In addition, by the protection by the head cap, the inside and outside of the head fixing portion can be reliably isolated.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, in a head anchoring structure 10 for an anchor for burying ground according to the present invention, a pair of upper and lower adjust plates 16 are provided between an anchor plate 12 and an anchor head 14. , 17 are combined and interposed, and the head cap 20 allows the PC
The end (head) of the steel strand 22 and the anchor head are covered.

Anchor plate (also referred to as supporting plate) 12
Is formed integrally with a so-called slippage prevention pipe 12b which has a through hole 12a in the center portion through which an outer sheath 24 described later can be loosely inserted and which prevents the ground 26 from slipping with respect to the hole 28. The PC stranded wire 22 is arranged at the entrance of the hole in the ground in a state where it is loosely fitted in the insertion hole.

Further, one end is buried inside the hole 28 in the ground.
The PC steel strand 22 is, for example, tensioned under a predetermined load (anchoring load) by a tensioning device (not shown), and the anchor head 14 is fixed to the PC steel strand with the wedge 30 being fitted. , And is fixed while maintaining a predetermined load.

The tension and fixation of the PC steel strands 22 are performed by a known procedure, and the method itself is known and is not the purpose of the present invention, and therefore will not be described in detail here.

Here, as shown in FIG. 1, in the present invention, the combined upper and lower adjustment plates 16 and 17 are interposed between the anchor plate 12 and the anchor head 14. And in this invention, for example,
A pipe-shaped outer sheath (also referred to as an SJ straight sheath) 24 that partially covers the circumference of the PC stranded wire 22 inside the hole 28 in the ground is integrally provided on the upper adjustment plate 16 by welding or the like. Insert hole 17 of plate 17
a, It is inserted into the hole in the ground through the insertion hole 12a of the anchor plate.

One end of the outer sheath 24 is fitted into, for example, the insertion hole 16a of the upper adjustment plate 16, and is welded to the periphery of the insertion hole when the terminal and the base surface 16b of the upper adjustment plate are flush with each other. And the outer sheath
The free end of 30 is fitted around a free length sheath into which the PC steel strand 22 is loosely inserted inside the hole 26 in the ground. In addition,
Such an outer sheath itself is publicly known, and its configuration, function, and the like are the same as those of the publicly known one.

As shown in FIG. 1, the upper and lower adjust plates 16 and 17 are formed into shapes having non-uniform thicknesses, that is, shapes having inclined surfaces 16c and 17c with respect to the base surfaces 16b and 17b, respectively. ing.

Upper and lower adjustment plates 16 and 17
Are formed, for example, with different maximum and minimum thicknesses. Then, the slopes 16c and 17c are combined so as to face each other, and the anchor plate 12 and the anchor head 14 are changed by, for example, a change in the angle of the base 17b with respect to the base 16b in accordance with the combination angle due to rotation or the like.
Upper and lower adjust plates 16 and 17 are configured so that the angle between them can be adjusted.

The angle adjustment range of the upper and lower adjust plates 16 and 17 is, for example, about 0 to 10 °. In particular, such adjustment plates 16, 17
For example, it may be used under a combination angle where a large force is applied.

Here, as can be seen from FIG. 2, for example, the respective inclined surfaces 16c, 17c of the upper and lower adjust plates 16, 17 are formed as a pair of mutually engaging radially uneven surfaces. Have been. In such a configuration, the uneven surfaces (slope surfaces) 16c and 17c serve as non-slip surfaces, and the upper and lower adjust plates 16 and 17 reliably prevent the other one from shifting from the other.
A certain angle can be secured between them, and the stability of the anchor head 14 with respect to the anchor plate 12 is further improved.

As can be seen from FIG. 1, after the PC steel strand 22 is fixed with the anchor head 14 fixed, the head (end) of the PC steel strand is prevented from being exposed and protected. Target head cap (also called oil cap)
20 are disposed over the PC strand head and anchor head.

Here, in the present invention, FIG. 1 and FIG.
As shown in FIG. 5, a pair of screw portions 34 and 35 that can be screwed to each other are formed on the outer peripheral surface of the upper adjust plate 16 and the inner surface of the open end of the head cap, respectively, and are screwed to the upper adjust plate. , A head cap can be attached. The thread portion (male thread portion) 34 of the upper adjust plate is formed, for example, on the outer peripheral surface of the small diameter portion via a step.

As described above, the outer sheath 24 is provided integrally with the upper adjustment plate 16 in the head anchoring portion 10 of the ground burying anchor according to the present invention. That is, unlike the known configuration in which a joint plate is provided at one end of the outer sheath 24, in the present invention, the outer sheath 24 is attached to the head fixing portion without providing the joint plate.
Can be disposed, the number of components in the head fixing section is reduced, and the configuration is simplified.

Further, in addition to the reduction in the number of parts, the outer sheath 24 can be arranged at a predetermined position under the arrangement of the upper adjustment plate 16, so that the assembling work of the head fixing portion becomes easy, and the workability is improved. As well as light weight and low price can be sufficiently achieved.

In the present invention, as can be seen from FIG. 1, the outer sheath 24 is provided integrally with the upper adjustment plate 16 and the head cap 20 is provided.
Is directly attached to the upper adjustment plate, so that a free length sheath is provided outside the head cap and in a hole in the ground.
32 is reliably isolated. Accordingly, intrusion of rainwater or the like into the outer sheath 24 and the free-length sheath 32 can be reliably prevented, and the rust prevention effect of the PC steel strand is further improved.

Here, in the embodiment, the slopes 16c and 17c of the upper and lower adjust plates, that is, the opposing surfaces are formed as a pair of concave and convex surfaces which can be engaged with each other. However, the present invention is not limited to this. Instead, the upper and lower adjust plates may be formed with the inclined surface being a flat surface.

However, if the slopes 16c and 17c of the upper and lower adjustment plates are respectively formed as a pair of uneven surfaces, the pair of uneven surfaces becomes non-slip under the engagement, and a large force is applied to the upper and lower adjust plates. Plate 16, 17
Even if it acts in the middle, the displacement of one of the adjust plates with respect to the other is reliably prevented, so that a certain angle can be sufficiently secured between the base surfaces 16c and 17c of the upper and lower adjust plates. Therefore, according to such a configuration, the stability of the anchor head 14 with respect to the anchor plate 12 is further improved.

In the embodiment, the outer sheath 24 is provided integrally with the upper adjustment plate 16, but the outer sheath and the lower adjustment plate 17 may be integrated.

However, if the outer sheath 24 is integrated with the upper adjust plate 16 as in the embodiment, the angle of the outer sheath with respect to the hole 28 in the ground will not be excessive, and the upper and lower adjust plates 16 and 17 will not be forced. Intrusion of rainwater or the like from between can be reliably prevented. Therefore, the outside of the head cap 20 and the like can be reliably separated from the inside of the outer sheath, and the rust prevention effect of the PC steel strand at the head fixing portion is further improved.

The embodiment described above is for explaining the present invention, and does not limit the present invention in any way.
It goes without saying that all modifications and alterations within the technical scope of the present invention are included in the present invention.

[0032]

[Effect of the Invention] As described above, according to the head anchoring portion of the ground burying anchor according to the present invention, the outer sheath is provided integrally with the upper adjustment plate, so that the joint plate becomes unnecessary. The configuration is simplified by reducing the number of parts. Therefore, the assembling work of the head fixing portion is facilitated, the workability is improved, and the weight and cost are sufficiently reduced.

In addition, since the outer sheath is provided integrally with the upper adjustment plate and the head cap is directly attached to the upper adjustment plate, the outside of the head cap and the free length sheath in the ground are reliably separated. Is done. Therefore, intrusion of rainwater or the like into the outer sheath and the free-length sheath can be reliably prevented, and the rust prevention effect of the PC steel strand is further improved.

If the outer sheath is fixed to the periphery of the insertion hole in a state flush with the base surface of the upper adjustment plate, the generation of a gap between the periphery of the insertion hole and the outer sheath can be sufficiently suppressed.

Further, if the opposing surfaces of the upper and lower adjustment plates are formed as a pair of uneven surfaces, the unevenness serves as a non-slip surface, and the displacement of one of the adjust plates with respect to the other can be reliably prevented. Therefore, a certain angle can be sufficiently secured between the anchor plate and the anchor head, and the stability of the anchor head with respect to the anchor plate is further improved.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a structure of a head anchoring portion of a ground burying anchor according to the present invention, in which an upper half portion is broken.

FIG. 2 is an exploded perspective view of upper and lower adjustment plates.

[Explanation of symbols]

 10 Anchor head anchor structure for ground burial 12 Anchor plate (support plate) 14 Anchor head (anchor) 16, 17 Upper and lower adjust plates 16b, 17b Base plate of adjust plate 16c, 17c Slope of adjust plate ( Opposing surface, uneven surface) 20 Head cap (oil cap) 22 PC steel strand 24 Outer sheath 26 Ground 28 holes 34, 35 Thread

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hidefumi Nogami 3-18-5 Toranomon, Minato-ku, Tokyo San Sui Engineering Co., Ltd. (72) Inventor Masayoshi Fukai 6-20-13-501 Higashisuna, Koto-ku, Tokyo

Claims (3)

(57) [Scope of request for utility model registration] 1. In a hole in a ground where an anchor plate is disposed at an entrance, a PC steel stranded wire is covered by an outer sheath and a free-length sheath, and is passed through a pair of adjusting plates having an uneven thickness including an upper portion and a lower portion. The PC steel strand is fixed in tension to the ground by fixing the PC steel strand with the anchor head that is arranged in a position, and the head of the PC steel strand is fixed by the head cap attached to the specified member. And in the head anchoring structure of the anchor for ground burial in which the anchor head is covered, by fixing one end to the upper adjustment plate, the outer sheath is provided integrally with the upper adjustment plate,
The head cap can be attached to the upper adjustment plate by a pair of screw parts that are inserted into the hole of the ground through the respective insertion holes of the lower adjustment plate and the anchor plate, and screwed together. Head anchoring structure of anchor for burying ground. 2. A head anchoring structure for a ground-embedded anchor according to claim 1, wherein one end of the outer sheath is fixed to the periphery of the insertion hole in a state flush with the base surface of the upper adjustment plate. 3. A head anchoring structure for a ground burial anchor according to claim 1, wherein the upper and lower adjusting plates have opposite surfaces formed as a pair of mutually engaging radially uneven surfaces.