JP3195955B2 - Ground anchor head cap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head cap for a ground anchor.

[0002]

2. Description of the Related Art A ground anchor is made by prestressing a tensile material made of PC steel or carbon fiber strands at the ends of the ground and the structure, and freeing the middle portion thereof against strain, thereby allowing the tensile material to be prestressed. This is a structure composed of an underground fixing part, a free length part, and a head fixing part.

[0003] Fig. 6 shows an example, in which 1 is a fixing length portion, 2 is a tip portion, 3 is a free length portion, 4 is an anchor head as a head fixing portion. A tension material (tendon) 5 is inserted thereinto, grout 6 such as cement milk or the like is injected into the fixing portion 1 with an injection hose, and after this is solidified, a tensile force is applied to the anchor head 4 to fix the head. .

In this example, a carbon fiber stranded wire is used as the tensile member 5. In FIG. 7, numeral 7 denotes a state in which the tensile member 5 is set inside the casing (which is set at the time of drilling a boring hole, and is pulled out after grout pressing). The tip guide 8 provided so as to pass therethrough is a spacer for securing the position of each of the carbon fiber strands in the fixing length portion and securing the covering of the anchor.

[0005] In the free-length portion 3, a water-stopping material is provided at the distal end of the free-length portion sheath 9 to prevent grout from entering the inside.
10 is set, and a spacer 11 for securing a position in the free-length portion sheath 9 is set on the penetrating tension member 5.

[0006] In the figure, reference numeral 12 denotes tension from transport / loading of the anchor.
Stainless steel head protection pipe to protect the thread of the tendon grip 13 until fixing, 14 is the head protection pipe 12
A heat-shrinkable tube 15 for stopping water between the sheath and the free-length portion sheath 9 is a gap filling packing.

In the anchor head 4, a supporting plate 16 made of stainless steel is disposed so that the tendon grip 13 penetrates through a central through hole 16 a, and is fixed by a nut 17 made of stainless steel screwed into the tendon grip 13. .

Further, the tendon grip 13 is provided with a head cap 18 in order to protect a screw thread due to a falling rock from the upper part after the anchor construction is completed. The head cap 18 is made of high-density polyethylene, has a screw hole 22 formed in a small flange 21 projecting horizontally from the main body 20, and is bolted to the support plate 16.

[0009]

The head cap 18
Was made of high-density polyethylene and could not be colored later. For example, most of the color was gray to match with concrete.

Further, as described above, the flange 21 is made as small as possible, and the supporting plate 16 projects beyond the flange 21 and is exposed. As shown in FIG. 7, when a light pressure receiving plate 19 using a laminate of a synthetic material in which hard urethane foam is reinforced with glass long fibers is provided, the color of the light pressure receiving plate may be changed to green, for example, in accordance with greening. The support plate 16 located at the center of the support plate 16 protrudes into silver, and the gray head cap 18 is located at the center of the support plate 16, resulting in a very inconsistent color.

An object of the present invention is to solve the above-mentioned disadvantages of the prior art, and it is not necessary to expose the supporting plate, and it is possible to color freely. Therefore, it is possible to match the color with the lightweight pressure receiving plate, and it is possible to harmonize with the environment. To provide a head cap.

[0012]

Since the present invention SUMMARY OF], to attain the aforementioned object, it is obtained by injection molding of ABS resin weathering grades as comprising the main body and the flange portion, a body portion
A triangular-shaped reinforcing rib is radially interposed at the joint with the flange.
It is integrally molded with a gap , and the flange part is on the upper floor plate and outside the upper floor plate.
It is formed in a flat box-like body with an open bottom surface so that the supporting plate is completely covered with the side wall plate hanging down from the edge, and the lower end of the side wall plate is formed.
Further, an outwardly facing piece is formed, and the bottom side is connected to the outwardly facing piece.
Triangular strip shaped reinforcing ribs
The gist is that it has been formed .

According to the first aspect of the present invention, the resin is injection-molded with a weather-resistant ABS resin, and a weather-resistant coating can be applied freely. Further, since the supporting plate can be completely covered and concealed from above by the flange portion, the head cap does not protrude if the color is matched with the lightweight pressure receiving plate. Furthermore, if it matches the environment, such as greening with a light pressure receiving plate, the appearance is good.

In addition, the strength of the flange itself can be improved by reinforcing the joint between the flange having a larger area, the main body and the flange, and in addition to this, the reinforcing is further provided by the flange. The strength of the remaining side wall plate portion can also be improved.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a longitudinal sectional front view showing one embodiment of a head cap of a ground anchor of the present invention,
FIG. 2 is a plan view of the same, and the head cap 18 of the present invention also includes a main body portion 20 and a flange portion 21 as in the related art.

The head cap 18 of the present invention was injection-molded with a weather-resistant ABS (acrylonitrile-butadiene-styrene) resin. This ABS resin is GRABS reinforced with glass (long) fibers.

Further, a flange 21 extending from the main body 20 is formed in a flat box-like body having an open bottom surface by an upper floor plate 23 and a side wall plate 24 hanging down from an outer edge of the upper floor plate 23.

The upper floor plate 23 has substantially the same size as the support plate 16, the height of the side wall plate 24 is substantially the same as the thickness of the support plate 16, and a flat box formed by the upper floor plate 23 and the side wall plate 24. The shape is large enough to completely cover the support plate 16 from above.

The main body 20 is a circular cap, and triangular-shaped reinforcing ribs 25 are radially spaced from each other at a joint between the main body 20 and the upper floor plate 23 at the flange portion 18 (shown in the figure). Then 90
(At intervals of °).

The provision of the triangular-shaped reinforcing ribs 25 reinforces the joint between the main body portion 20 and the flange portion 18 and also reinforces the upper floor plate 23 of the flange portion 18. As a result, the upper floor plate Cross-sectional defects caused by providing the screw holes 22 in 23 can be compensated.

Further, an outwardly facing piece 26 is formed at the lower end of the side wall plate 24 of the flange portion 18, and a triangular piece-shaped reinforcing rib 27 whose base is connected to the outwardly facing piece 26 is appropriately formed on the outer periphery of the side wall plate 24. They were integrally molded at intervals.

By providing the triangular-shaped reinforcing ribs 27, the strength of the side wall plate 24, which is the remaining portion other than the upper floor plate 23 reinforced by the reinforcing ribs 25 at the flange portion 18, can be improved. .

The head cap of the conventional ground anchor is used in order to protect the thread of the tendon grip 13 due to falling rocks from the upper part after the completion of the anchor work, as shown in FIG. To the support plate 16 with bolts.

At this time, as shown in FIGS.
Fits inside the flange portion 18 and is not exposed outside. Also,
It is possible to freely apply weatherproof paint and match the color with the lightweight pressure receiving plate 19.

The ground anchor itself is not particularly limited, and a conventional PC steel material may be used for the tensile member 5, and other new materials may be used.

[0026]

As described above, the head cap of the ground anchor according to the present invention does not need to expose the supporting plate and can be freely colored, so that the color matching with the light pressure receiving plate is possible, and it is possible to harmonize with the environment. You can do it.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing one embodiment of a head cap of a ground anchor of the present invention.

FIG. 2 is a plan view showing one embodiment of a head cap of the ground anchor of the present invention.

FIG. 3 is a vertical sectional front view of a main part showing one embodiment of a head cap of the ground anchor of the present invention.

FIG. 4 is a partially cutaway perspective view showing a use state of a head cap of the ground anchor of the present invention.

FIG. 5 is a partially cutaway side view showing a use state of the head cap of the ground anchor of the present invention.

FIG. 6 is a partially cutaway side view showing a use state of a head cap of a conventional ground anchor.

FIG. 7 is a partially cutaway perspective view showing a use state of a head cap of a conventional ground anchor.

FIG. 8 is a plan view showing a conventional example.

FIG. 9 is a vertical sectional front view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Fixing length part 2 ... Tip part 3 ... Free length part 4 ... Anchor head 5 ... Tensile material 6 ... Grout 7 ... Tip guide 8 ... Spacer 9 ... Free length part sheath 10 ... Waterproof material 11 ... Spacer 12 ... Head Part protection pipe 13 ... Tendon grip 14 ... Heat shrink tube 15 ... Gap filling 16 ... Support plate 16a ... Through hole 17 ... Nut 18 ... Head cap 19 ... Light pressure receiving plate 20 ... Main body 21 ... Flange 22 ... Screw hole 23 ... Upper floor plate 24 ... Side wall plate 25 ... Reinforcement rib 26 ... Outward facing part 27 ... Reinforcement rib

──────────────────────────────────────────────────続 き Continuing on the front page (72) Akira Hashimoto, Inventor, 8-14-14 Ginza, Chuo-ku, Tokyo Nittoku Construction Co., Ltd. (72) Koichi Suga, 8-14-14 Ginza, Chuo-ku, Tokyo, Japan (56) References JP-A-6-336727 (JP, A) JP-A-4-122736 (JP, U) JP-A-6-63632 (JP, U) (58) Fields investigated ( Int.Cl. ⁷ , DB name) E02D 5/80

Claims (1)

(57) [Claims] 1. A is obtained by injection molding of ABS resin weathering grades as comprising the main body and the flange portion, the main body
Triangular-shaped reinforcing ribs are radially provided at the joint between the flange and the flange
The flange is formed on the upper floor plate and the upper floor.
The supporting plate is formed as a flat box with an open bottom surface so that the supporting plate is completely covered from above with the side wall plate hanging down from the outer edge of the plate.
The end is further formed with an outward facing piece, and the outward facing
A triangular piece-shaped reinforcing rib to which the
A head cap of a ground anchor characterized by being formed at an interval .