JP2829705B2 - Earth retaining anchor structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a retaining panel, a sheet pile,
The present invention relates to a retaining anchor structure in which a retaining structure such as a pile is disposed along a ground and supported by an anchor cast in the ground.

[0002]

2. Description of the Related Art As shown in FIG. 6, when a retaining structure 2 such as a concrete retaining wall block is erected at a predetermined distance from a ground 1, and the retaining structure is supported by an anchor 3, The drilling hole 4 provided in the ground for anchoring the anchor 3 is sufficiently filled to inject the hardening material 5,
In order to discharge all the internal water (breathing water) to the outside and improve the quality of the hardening material 5, the hardening material 5 is inclined so as to become deeper toward the bottom. In this case, the hardening material 5 can be eliminated by sequentially filling the hardening material 5 from the bottom and pushing up the breathing water.

[0003] When the earth retaining structure 2 is fixed straight at the tip of the anchor 3 by extending straight from the excavation hole 4, the anchor head is attached obliquely to the surface of the earth retaining structure 2. A dispersed load of earth pressure is applied to the lower end of the structure 2 together with its weight, and a large local stress may be generated.

[0004] Accordingly, the applicant has filed Japanese Patent Application No.
In Japanese Patent No. 8222 (JP-A-5-311666), as shown in FIG. 6, the anchor 3 coming out of the excavation hole 4 is bent by a predetermined angle to be horizontal, and the earth retaining structure 2 is attached to the tip of this horizontal portion.
Was fixed.

In the drawing, reference numeral 6 denotes a main pillar made of H-shaped steel, and 7 denotes a protective tube which covers the bent portion of the anchor 3. The protective tube 7 is curved so as to be bent by 10 to 45 ° in accordance with the bending of the anchor 3 in advance. It is a single rigid tube shaped to draw. Reference numeral 8 denotes a tension member in the middle of the anchor 3.

[0006]

[0006] Thus, the anchor 3
When the anchor 3 itself is bent at a predetermined angle by passing the protective tube 7 bent in advance, the bending angle to be obtained is limited and the workability is poor.

[0007] An object of the present invention is to solve the above-mentioned disadvantages of the prior art, and to provide a required protection strength for a protective tube disposed at the bent portion of the anchor, and to allow the protective tube itself to freely move in accordance with the bending of the anchor. It is an object of the present invention to provide an earth retaining anchor structure which is flexible and has versatility in a construction state, and is easily arranged.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention firstly fixes an end of an anchor disposed in an excavation hole which is inclined so as to become deeper toward the bottom of the ground. The anchor coming out of the excavation hole is bent at a predetermined angle to make it horizontal, and in the earth retaining anchor structure for fixing the earth retaining structure at the tip of the horizontal portion, the bent portion of the anchor at the predetermined angle has a plurality of flexible protective members having different diameters. Secondly, the flexible protection tube is made of polyethylene, and thirdly, the multiple flexible protection tubes are appropriately shifted and arranged. Alternatively, the gist is that the multiple flexible protective tubes have different lengths from each other.

[0009]

According to the first and second aspects of the present invention, the anchor is inserted through the flexible protective tube and bent at a predetermined angle at this portion to protect the anchor in accordance with the bending of the anchor. The tube itself can also be bent. In addition, the protection tube is flexible but has multiple strengths to provide the necessary strength for protection. In bending, the gap between the multiple flexible protective tubes serves as a cushion.

According to the third and fourth aspects of the present invention, these multiple flexible protective tubes do not overlap each other at all, but some portions do not overlap, and this portion is easy to bend. This makes it easier to match the bending of the anchor.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a vertical sectional side view showing a first embodiment of an earth retaining anchor structure according to the present invention, and the same components as those in FIG.

That is, an earth retaining structure 2 such as a concrete retaining wall block is erected at a predetermined distance from a ground 1 composed of a bedrock 1a and a topsoil 1b. The excavation hole 4 is filled with a hardening material 5 so that the anchor 3 is fixed.

The anchor 3 coming out of the excavation hole 4 is bent at a predetermined angle to make it horizontal, and the earth retaining structure 2 is fixed to the tip of this horizontal portion.

In the present invention, as in the conventional case, a protective tube is placed over the bent portion of the anchor 3, but this protective tube 9 is a flexible tube made of polyethylene, and includes an inner tube 9a, a middle tube 9b, and an outer tube 9c.
The anchor 3 was inserted into the innermost inner tube 9a.

FIGS. 4 and 5 show the details of the protective tube 9. Referring to FIG. 4, reference numeral 10 denotes a corrugated pipe constituting the anchor 3 as a permanent anchor. Although no gap is required, the inner pipe 9
a, the middle tube 9b and the outer tube 9c have a diameter difference enough to leave an appropriate gap.

In this embodiment, the inner pipe 9a, the middle pipe 9b, and the outer pipe 9c have the same length. However, as shown in FIG. The inner pipe 9b is appropriately shifted so that the middle pipe 9b projects from the middle pipe 9b so that the inner pipe 9b projects from the middle pipe 9b.

When the anchor 3 filled with the hardening material 5 such as mortar and fixed as described above is bent at a predetermined angle so as to be horizontal at the place where it exits the excavation hole 4, the protective tube 9 is also bent. Deforms to bend according to the bending angle.

FIG. 3 shows a second embodiment of the present invention. The inner tube 9a, the middle tube 9b, and the outer tube 9c have the longest inner tube 9a and are sequentially reduced in length. , Shortest outer tube 9
c, a middle tube 9b protrudes from the outer tube 9c.
Alternatively, the inner tube 9a may project from the middle tube 9b.

Even in this case, the bent portion of the protective tube 9 is a single or double portion, and can be relatively easily bent.

In the above-described embodiment, the case where the protective tube 9 is a triple tube has been described. However, even if the protective tube 9 is a double tube or a quadruple tube, the number may be appropriately selected.

[0021]

As described above, according to the earth retaining anchor structure of the present invention, the protective tube disposed at the bent portion of the anchor can obtain the required protection strength, and the protective tube itself can be adjusted in accordance with the bending of the anchor. Since it bends freely, it has versatility in the construction state and is easy to dispose.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a first embodiment of an earth retaining anchor structure of the present invention.

FIG. 2 is a longitudinal sectional side view of a main part showing a first embodiment of the earth retaining anchor structure of the present invention.

FIG. 3 is a longitudinal sectional side view of a main part showing a second embodiment of the earth retaining anchor structure of the present invention.

FIG. 4 is a vertical sectional side view of a flexible protective tube used in the present invention.

FIG. 5 is a longitudinal sectional front view of a flexible protective tube used in the present invention.

FIG. 6 is a vertical sectional front view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Ground mountain 1a ... Rock 1b ... Topsoil 2 ... Earth retaining structure 3 ... Anchor 4 ... Excavation hole 5 ... Hardening material 6 ... Main pillar 7 ... Protection tube 8 ... Intermediate tension member 9 ... Protection tube 9a ... Inner tube 9b ... Medium pipe 9c ... Outer pipe 10 ... Corrugated pipe

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E02D 5/80

Claims (4)

(57) [Claims] 1. An anchor disposed in an excavation hole which is inclined so as to become deeper as it goes to the bottom of the ground, is anchored, and an anchor coming out of the excavation hole is bent by a predetermined angle to be horizontal, and the horizontal portion An earth retaining anchor structure for fixing an earth retaining structure to a tip end thereof, wherein the bent portion of the anchor at a predetermined angle is inserted through a plurality of multiplexed flexible protective tubes having different diameters. Construction. 2. The retaining anchor structure according to claim 1, wherein the flexible protective tube is made of polyethylene. 3. The retaining anchor structure according to claim 1, wherein the plurality of flexible protective tubes are appropriately shifted. 4. The retaining anchor structure according to claim 1, wherein the multiple flexible protective tubes have different lengths from each other.