JPH0978577A - Ground anchor ground fixing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the fixing work, make a ground fixing section compact, reduce the wasteful space, and reduce the cost by stretching and fixing the tensile material of a ground anchor in the direction perpendicular to a retaining member. SOLUTION: This ground anchor ground fixing structure is provided with a tensile material 9 linearly extended from the ground fixing section 10 of a ground anchor 1 and a guiding means 7 guiding in the direction perpendicular to the ground 12 and the surface of a retaining member 11. The guiding means 7 is a cylindrical rotor, and it is turnably fitted to a support frame 8 at the inside portion pinched by a pair of H-steels 6a fitted to the retaining member 11 to form a wale 6. A small plate-like pedestal 3 constituting a ground fixing section 2 and a nut-type fixing tool 5 are used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the construction of underground walls of buildings and ground anchors for earth retaining and slope protection for the purpose of earth tensioning and fastening of tension members. Ground anchors that can be installed in a direction perpendicular to the ground.

[0002]

2. Description of the Related Art Conventionally, when setting a ground anchor, the ground anchor has been set with an inclination with respect to the ground surface and fixed as it is. As shown in FIG. 8, the ground anchoring portion 2 of the ground anchor is a mechanism for transmitting a force at a right angle to the earth retaining member 11 on the surface of the ground 12 and holding the earth retaining member 11, but it is fixed to the tension member 9 with an inclination angle. Since it is necessary to effectively transmit the force to the soil retaining member 11 in this state, the pedestal 3 has a large size with an inclined surface, and there is a lot of wasted space. Further, since the tension member 9 is tilted and exposed from the ground surface, and the interval between the bellows rising 6 attached to the soil retaining member 11 is wide so as not to interfere with the tension member 9, stress applied to the pedestal 3 is also increased. The pedestal 3 had to be large and had an unnecessarily large and durable structure, which resulted in high cost. Further, the work of tensioning and fixing the tension member to the above-ground fixing portion also has to be performed in a state in which the whole is greatly inclined, so that workability is poor.

[0003]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to solve the above-mentioned problems and facilitate the fixing work by setting the tension / tightening direction of the tension member at right angles to the earth retaining member, Another object of the present invention is to provide a ground anchor ground fixing structure which can make the ground fixing portion compact, reduce the wasted space, and reduce the cost.

[0004]

Means for Solving the Problems The constitution of the present invention which has solved the above problems is as follows: 1) In a ground anchor for fixing an earth retaining member for supporting the ground to the surface of the ground, a ground exposed portion of a tension member of the ground anchor is flexible. In addition to providing a flexible wire, a guide means with a smooth curved surface that bends the tension member along the inside of the anti-raising member of the earth retaining member and bends in the direction perpendicular to the soil retaining member is provided. Ground anchor ground anchoring structure characterized in that it is fastened and fastened in a state in which the portion directed toward is tensioned 2) The ground exposed portion of the tension member is a metal strand with a sheath on the outer periphery, and The ground anchor ground fixing structure according to 1), wherein a screw portion is provided at the tip, and a nut-type fixing tool is screwed onto the tip of the fixing member to abdomen. Then, a member having a curved surface having a predetermined curvature is swingably provided inside the abdomen, and the tension member is arranged along the curved surface of the member. Ground anchor ground fixing structure 4) As the guiding means, a member having a curved surface with a predetermined diameter is rotatably provided inside the abdomen, and the tensile member is made to follow the curved surface of the member, 1). Or it is in the ground anchor ground anchoring structure described in 2).

[0005]

In the ground anchor ground anchoring structure of the present invention, the ground anchoring portion of the ground anchor and the tension member are driven at an angle with respect to the ground having the earth anchoring member on the surface, and then the surface of the earth anchoring member is pulled. At the same time, the bellows is attached to the exposed portion of the material on the ground in a correct positional relationship, and the guide means is raised and installed inside, and at the same time, the tension member is bent along the guide means and aligned in a direction perpendicular to the ground and the soil retaining member. In this way, the pedestal and the fixing tool as the aboveground fixing portion are passed through the tension member which is oriented in the right angle direction, and it is installed in the abdomen while holding it from below. When the ground anchoring portion of the ground anchor is ready to be fixed in this manner, the tension member is tensioned in the right angle direction using a jack or the like. Although the tension member is displaced a little due to the tension, the portion along the guide means is flexible and bends without resistance according to the guide means, and the tension force can be transmitted to the underground fixing portion as it is. When a predetermined tension force is generated between the above-ground fixing portion and the tension member, the tension member is securely affixed and fixed by the fixing tool. Even when the tension member is bent in the middle, as in the case of the straight shape, a supporting pressure can be surely applied to the earth retaining member through the abdomen rising from the ground fixing portion, and the ground is stably held.

In the structure in which the above-ground exposed portion of the tension member is a stranded wire with a sheath and the tip is provided with a screw portion, the tension member is bent along the guide means to be at right angles to the ground and the earth retaining member, After installing the fixing part and tensioning the tension member at a right angle to the soil retaining member to generate a predetermined tension force, tighten the nut type fixing tool screwed into the screw part at the tip of the tension member and raise the tension member. Fasten to.

In the structure in which the guide means having the curved surface is swingably provided, the tension member is bent in a shape along the curved surface of the guide means and is aligned in a direction perpendicular to the ground and the soil retaining member. When the tension member is tensioned during fixing, when the guide means tensions the tension member along the curved surface, the guide means can smoothly displace the tension member while swinging along with the tension member along the curved surface. Therefore, only the tensile member is not displaced and rubs against the guide means by friction, and the mutual contact surfaces of the tensile member and the guide means are hardly damaged.

In the structure in which the guide means which is a rotating body is rotatably provided, the tension member is bent along the curved surface of the guide means.
Orient it at right angles to the ground and earth retaining members. When the tension member is tensioned, the guide member is smoothly displaced while rotating along with the tension member along the curved surface, and the tension member is not rubbed with each other due to friction, so that the tension member is less damaged.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION As a guide means for a tension member in the present invention, one having a fixed smooth curved surface, one having a curved surface and capable of swinging, and one having a cylindrical surface and rotatable. Further, a fixed core material having a pipe-shaped rotation surface rotatably provided on the outer periphery thereof is used. Desirably, the one that rotates or swings so as not to generate frictional resistance by contact with the tension member. Further, these surfaces that come into contact with the tensile member may be provided with groove-shaped continuous depressions or the like so that the tensile member is less likely to be displaced in a direction other than the tension direction.

The abdomen for installing the above-ground fixing portion of the present invention is provided in such a size that the guide means can be housed inside.
Mostly, one set of H-shaped steel is used to provide the pedestal at sufficient intervals, but if the pedestal can be installed and supported with sufficient strength, the guide means can be housed inside and the hole through which the tension member is passed. It may be a box-shaped or groove-shaped cross-section provided with. As for the method of attaching the bellows to the earth retaining member, which is mainly made of steel, welding is often used when the earth retaining member is made of steel, and when the earth retaining member is made of rebar or steel concrete, the earth retaining member is used. The concrete on the surface of the member is shaved and the abdomen is welded directly to the reinforcing bar / steel of the core material, the abdomen is anchored to the soil retaining member using a small anchor called a ground anchor, which is different from the ground anchor. A method is mainly used in which a hole having a predetermined size is provided in the fastening member and a part of the abdomen upright that is fitted into the hole is fitted and fixed.

The fixing tool used in the present invention is of a nut type for fixing by screwing into a screw portion provided at the tip of the tension member, and a tension member does not move by driving a wedge into the gap between the tension member and the pedestal. Any of the wedge-shaped ones that are fastened and fixed may be used.

[0012]

An embodiment of the present invention will be described with reference to the drawings.
This embodiment is a structural example in which a rotating body having a grooved cylindrical surface is provided as a guiding means, the ground exposed portion of the tension member is a steel strand with a sheath, and a screw portion is provided at the tip. FIG.
Is an explanatory view showing a ground anchor adopting the embodiment,
2 is an explanatory view showing the main part of the embodiment, FIG. 3 is a rear view showing the guide means of the embodiment, FIG. 4 is a cross-sectional view showing the bend portion of the tension member of the embodiment, and FIG. 5 is an installation process of the embodiment. An explanatory diagram showing
6 is an explanatory view showing another example of the guiding means of the embodiment, FIG. 7 is an explanatory view showing another example of the guiding means of the embodiment, and FIG. 8 is another example of the ground anchor adopting the embodiment. FIG.

In the ground anchor ground anchoring structure of this embodiment, the ground 1 on which the earth retaining member 11 made of steel is installed.
2 A direction in which the tension member 9 of the ground anchor 1 placed with a predetermined inclination with respect to the surface extends linearly from the underground fixing portion 10 and is orthogonal to the surfaces of the ground 12 and the soil retaining member 11. By providing the guide means 7 for guiding to
The system allows tensioning and fixing work at right angles to the surface.
The guide means 7 is attached to the earth retaining member 11 by welding, and is attached to the inner portion sandwiched by a pair of H-shaped steels 6a forming the bellows 6,
It is provided so as to be rotatable and attached to the support frame 8. The guiding means 7 is a cylindrical rotating body, and a guide groove 7b for preventing lateral displacement of the tension member 9 is formed on the curved surface 7a on the outer periphery which contacts the tension member 9. Then, the guide means 7 is provided at a position where the linear tension member 9 and the curved surface 7a at the time of placing the first contact portion are in contact with each other, and the ground exposed portion of the tension member 9 is directly moved from the contact point with the curved surface 7a to the soil. It is possible to bend in a direction perpendicular to the fastening member 11. The predetermined section of the above-ground exposed portion of the tension member 9 that bends according to this guide means 7
As the bend portion 9b, a flexible PC steel stranded wire 9d, which is obtained by twisting thin steel wires together and then tightening with a crimping device, is covered with a sheath 9e in the middle of the underground portion 9c and the screw portion 9a. It has a structure that is connected in a continuous form. The abdomen uplifting 6 which accommodates the guide means 7 therein is bent by the tension member 9 exposed in a straight line at the beginning of driving, and is fixed by bending the tension member 9 horizontally.
H-shaped steel 6a to earth retaining member 11 without considering interference
It can be made compact by reducing the mounting interval of. The ground anchoring portion 2 of the ground anchor 1 is composed of a pedestal 3, a bearing plate 4, and a fixing tool 5. Of these, the pedestal 3 which is directly installed on the abdomen 6 is the tension direction of the tension member 9 and the earth retaining member 11 and the ground 12. The stress applied to the inside of the pedestal 3 is reduced due to the fact that the directions of bearing pressure to the same are coincident with each other and the gap between the H-shaped steels 6a forming the bellows 6 is reduced, so that a small and simple plate-like member can be obtained. The fixing member 5 has a threaded portion 9 a of the tension member 9.
It is a general nut type that is used in combination with and easy to re-tension.

As another example of the guide means 7 of this embodiment, a swing member having a curved surface 7c having a predetermined curvature is a curved surface 7c.
The following is an example in which the center of curvature is used as a swing center and the bellows are erected and swingably mounted inside 6 (see FIG. 6). In addition, as another example of the guide means 7 of the present embodiment, an example in which a member having a smooth arcuate curved surface 7c is raised and fixed inside the body 6 (see FIG. 7). In either case, the curved surface 7c is provided inside the abdomen 6 so that the curved surface 7c comes into contact with the linear tension member 9 at the beginning of driving.

In the ground anchor 1 construction employing the ground anchor ground anchoring structure of this embodiment, the ground anchoring portion 10 and the tension member of the ground anchor 1 are inclined to the ground 12 where the earth retaining member 11 is first installed. Place 9 Next, a set of H-shaped steels 6a is erected on the exposed ground portion of the tensile member 9 on the surface of the earth retaining member 11 by welding at fixed intervals. Then, a rotatable guide means 7 is adjusted inside the bellows 6 by a supporting frame 8 and a height adjusting frame 14 so as to come into contact with the tension member 9, and is attached.
At the same time, the linear tension member 9 is bent along the curved surface 7a of the guide means 7 and aligned in a direction perpendicular to the ground 12 and the soil retaining member 11. In this state, the pedestal 3 is attached to the tension member 9.
Also, the pressure bearing plate 4 and the fixing tool 5 are passed through them to support them.
Hold it from below at 3 and raise it up and install it at 6. After that, the tension member 9 is tensioned in the right angle direction by a jack or the like. When the tension member 9 is displaced due to tension, the guiding means 7
Rotates in accordance with the movement of the bend portion 9b of the tension member 9 along the curved surface 7a, and does not hinder the smooth displacement of the whole tension member 9, so that an unreasonable force is not applied to the tension member 9. When a predetermined tension force is generated between the ground fixing portion 2 and the tension member 9 due to the tension, the fixing member 5 completely fixes the screw portion 9a of the tension member 9 and the ground fixing portion 2, and the tension member 9 and the belly member 6 are raised. Securely fasten. After the fixing work is completed, the construction is completed if the support member 13 is removed.

As another example of the ground anchor 1 adopting the ground anchor ground fixing structure of this embodiment, an example in which the ground anchor 1 is installed on an inclined slope 15 is shown (see FIG. 8). In this example, the earth retaining member 11 is installed on the slope 15, and the ground 1
The underground fixing portion 10 of the ground anchor 1 and the tension member 9 are horizontally mounted on the No. 2. By the guide means 7, the tension member 9 is bent at a right angle to the slope 15 and the soil retaining member 11, and tension and fastening are performed in the right angle direction. ,
Similar to the above example. The tension force of the tension member 9 is applied to the slope 15
The bearing pressure can be reliably transmitted to the upper soil retaining member 11 and the slope 15 can be stably held.

[0017]

According to the present invention, the tension member and the above-ground fixing portion are tensioned and fixed in the direction perpendicular to the earth retaining member so that the tensioning and fixing work need not be performed in a greatly inclined posture. , The work becomes easy and the workability is greatly improved. In addition, the ground fixing section as a whole has been made simpler and smaller and more compact, which has led to cost reduction and effective use of space, which is useful for construction of underground walls, earth retaining, slope protection, etc. is there.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a ground anchor adopting an embodiment.

FIG. 2 is an explanatory diagram showing a main part of the embodiment.

FIG. 3 is a rear view showing the guiding means of the embodiment.

FIG. 4 is a cross-sectional view showing a bend portion of a tensile member of an example.

FIG. 5 is an explanatory diagram showing an installation process of the example.

FIG. 6 is an explanatory diagram showing another example of the guide means of the embodiment.

FIG. 7 is an explanatory view showing another example of the guiding means of the embodiment.

FIG. 8 is an explanatory diagram showing another example of the ground anchor adopting the embodiment.

FIG. 9 is an explanatory diagram showing a conventional ground fixing unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ground anchor 2 Ground fixing part 3 Pedestal 4 Pressure plate 5 Fixing tool 6 Raising 6a H-shaped steel 7 Guide means 7a Curved surface 7b Guide groove 7c Curved surface 8 Support frame 9 Pulling member 9a Screw part 9b Bend part 9c Underground part 9d PC Steel stranded wire 9e Sheath 10 Underground fixing part 11 Earth retaining member 12 Ground 13 Supporting member 14 Height adjustment frame 15 Slope

Claims (4)

[Claims] 1. In a ground anchor for fixing an earth retaining member for supporting the ground to the surface of the soil, a ground wire exposed portion of the tension material of the ground anchor is a flexible wire and the ground retaining member is provided inside the bellows of the earth retaining member. A guide means with a smooth curved surface that bends the tension member along the right angle to the soil retaining member is provided, and the tension member is bent and fastened to the abdomen with the part oriented in the right angle direction strained. A ground anchor ground anchoring structure featuring. 2. The above-ground exposed portion of the tension member is made of a twisted metal wire with a sheath on the outer periphery, and a threaded portion is provided at the tip, and a nut type fixing tool is screwed into the threaded portion to prevent abdominal rise. The ground anchor ground fixing structure according to claim 1, which is configured to be worn. 3. A member having a curved surface having a predetermined curvature is provided inside the belly-up member as the guiding means so as to be swingable, and a tension member is arranged along the curved surface of the member.
The ground anchor ground fixing structure according to claim 1. 4. A member having a curved surface of a predetermined diameter is rotatably provided inside the belly-up member as the guide means, and a tension member is made to follow the curved surface of the member. Ground anchor structure described above.