JP2003064677A - Simple anchor and execution method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple anchor and an execution method therefor, which can enhance workability and reduce construction costs, without sacrificing anchor strength. SOLUTION: The simple anchor 1 and the execution method therefor are characterized as follows: the simple anchor 1 makes a tension member 20 anchored into an anchor hole via a grout material 40, and makes a base end of the tension member 20 tensioned for anchoring; the tension member 20 is composed of an anchor body 21, which is buried in the grout material 40 in the anchor hole, and one strand material 22 which is connected to the anchor body 21; and one side of the strand material 22 is made to pass through the anchor body 21, so as to be connected to the anchor body 21.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a simple anchor and a method for constructing the same.

[0002]

2. Description of the Related Art Anchor construction methods are roughly classified into earth anchor construction and rock bolt construction. Generally, the anchor proof strength of the earth anchor is relatively larger than that of the lock bolt, and is properly used depending on the anchor proof strength required at the construction site.

[0003]

[Problems to be Solved by the Invention] Although the rock bolt work is excellent in workability and construction cost, it has a drawback that it is difficult to obtain a large anchor proof stress. The ground anchor work is high in anchor proof strength but poor in workability. However, there is a drawback that the construction cost increases. Under such characteristics of the anchor, there are some sites where a higher anchor proof strength is required than that of the rock bolt construction, and good workability and low construction cost are required. It is uneconomical and construction work is difficult at such a site, and construction of an earth anchor work is demanded, and the proposal of the improvement technique is desired.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a simple anchor capable of improving the workability and reducing the construction cost without sacrificing the anchor proof stress, and the same. To provide a construction method.

[0005]

In order to achieve the above object, the present invention provides, as claim 1, a tension material is fixed in an anchor hole through a grout material and a base end of the tension material is tensioned. A simple anchor that is fixed by means of a fixing member in which the tensile member is embedded in the grout member in the anchor hole, and a single strand member connected to the fixing member, and one of the strand members is fixed. Provided is a simple anchor, which is characterized by being penetrated and connected to a body. Further, the present invention provides, as claim 2, the simple anchor according to claim 1, wherein one of the strand materials which penetrates the fixing body is connected by a wedge fixing means. Further, the present invention provides a simple anchor according to claim 1 or claim 2, wherein a re-tensionable wedge fixing means is provided on the other side of the strand material as claim 3. Further, the present invention provides the simple anchor according to any one of claims 1 to 3, wherein a protrusion is formed on a peripheral surface of the fixing body. In addition, the present invention provides a method of constructing a simple anchor according to claim 5, wherein a tension material is fixed in an anchor hole through a grout material, and a proximal end of the tension material is tensioned and fixed. Construction of a simple anchor, characterized in that the simple anchor according to any one of item 4 is used, the fixing body is embedded and fixed in the grout material in the anchor hole, and the proximal end of the strand material is tensioned to be wedge-fixed. Provide a way.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

<A> Simple anchor FIG. 1 shows an explanatory view of the simple anchor 1. In the simple anchor 1, the tensile member 30 is placed in the anchor hole and the grout member 40 is attached.
It is a simple anchor 1 that is fixed via a tension member 20 and is fixed by tensioning the base end of the tension member 30.
It consists of 0 and.

The tension member 20 is composed of a fixing member 21, a single strand member 22, a sheath 23, and a water blocking portion 24.

<B> Fixing Body The fixing body 21 is a member constituting the tip of the anchor 1 and is made of steel, resin or the like. The fixing body 21 is formed to have a length that can withstand the required anchor proof strength. Fixing body 2
1 is formed to have a length that can withstand the required anchor proof stress. The fixing body 21 is formed with a protrusion 211 on the outer periphery and a hollow structure having a through hole 212 penetrating in the axial direction in the axial center portion.

In FIG. 1, the protrusion 211 has a shape in which a plurality of protrusions are formed in a ring shape, but the protrusion shape is not limited to this. It may be anything. Further, although not shown, a continuous groove may be formed on the outer periphery of the fixing body 11 instead of providing the protrusion 211. The diameter of the through hole 212 is
It is formed to be at least larger than the diameter of the strand material 22 to be communicated.

When a wedge connection is used as a connecting means for the fixing member 21 and the strand 22, the opening of the fixing member 21 on the tip side of the anchor is used to accommodate the wedge member 25. It forms like a mortar. (Fig. 2)

<C> Strand Material The strand material 22 is a member for transmitting the tension force introduced by the fixing tool 30 to the fixing body 21. Strand material 22
Uses only one strand material generally used in an anchor construction method such as PC steel wire and PC steel stranded wire. The outer periphery of the strand material 22 is covered with a sheath 23 for water shielding.

<D> Connection of Fixing Body and Strand Material FIG. 2 shows a connecting portion between the fixing body 21 and the strand material 22. The fixing body 21 and the strand material 22 are connected to each other by wedge-fixing one of the strand materials 22 penetrating the through holes 212 of the fixing body. More specifically, the wedge body 25 is tightly attached to one of the strand materials 22, and the wedge body is fitted into the through hole 212 of the fixing body and fixed. The connection between the fixing body 21 and the strand material 22 is not limited to the wedge fixing, and a knot is simply formed on one side of the strand material 22 and the knot is fitted into the through hole 212 of the fixing body 21 to fix it. May be.

<E> Water-stopping part The water-stopping part 24 is formed of the strand material 22 as shown in FIG.
After wrapping the other part of the water impermeable material 241 with the other part and the seam part of the fixing body 21, both ends of the water impermeable material 241 are attached to the tape material 2
It is formed by a generally used water-blocking method, such as by sealing with 42.

<F> Fixing device The fixing device 30 adopts a wedge fixing structure that can be re-tensioned, and includes a bearing plate 331, an anchor head 332, and a wedge body 333.
It consists of.

[Construction Method] Next, a method of using the simple anchor of the present invention will be described.

<A> Drilling of anchor hole A predetermined anchor hole is drilled in the ground or the like where anchors are fixed. Since the simple anchor 1 of the present invention uses only one tension member 20, the anchor hole may have a hole diameter similar to that of the lock bolt. Further, since the tension member 20 has flexibility, it can be easily installed in a deep anchor hole. Therefore, the anchor hole can be drilled deeper than the lock bolt process.

The strand material 22 is cut into a length corresponding to the drilled anchor hole, and the fixing member 21 and the like are connected to this to assemble the simple anchor 1. Simple anchor 1 of the present invention
Since it can be easily assembled by cutting the strand material 22, the length of the strand material 22 can be adjusted even when the drilling depth of the anchor hole is deviated.

<B> Installation of Simple Anchor The simple anchor 1 is inserted into the drilled anchor hole for installation. Since the strand material 22 of the simple anchor 1 to be inserted has flexibility, it is sufficient to insert the strand material 22 sequentially from the end even when the anchor hole is located at a high place. Does not need to be raised to the same height as. Although not shown, when the simple anchor is inserted into the anchor hole, a grout hose for injecting grout material is similarly inserted into the anchor hole. In addition, it is advisable to insert an adjusting device such as a spacer so that the installation position of the simple anchor does not shift during insertion.

<C> Filling of grout material Grout material 4 is used by using a grout hose in the anchor hole.
0 is filled up to the fixing body 21. If there is a risk of damage to the anchor hole due to the fixing body 21 colliding with the bottom of the anchor hole, the grout material 40 may be filled before inserting the anchor 1.

<D> Tensioning, After fixing the grout material 40 filled in the anchor hole to reach a predetermined strength, the grout hose is cut. After attaching the pressure support plate 31, the anchor head 32, and the wedge 33 as the fixing tool 30 to the end of the tension member 20, the tension member 20 is tensioned and the tension member 20 is fixed to the pressure bearing plate 31 as it is.
Rust-proofing is performed by covering the anchor head 32 with the cap 50 and the construction is completed. (FIG. 1) As a result, the tension force introduced into the anchor 1 by the protrusions 211 of the fixing body 21 and the grout material filled around the fixing body 21 can be transmitted to the fixing ground to firmly support the surrounding ground.

[Operation] When the simple anchor 1 is tensioned, the projections 211 formed on the outer periphery of the fixing body 21 and the grout material 40.
As a result, the tension of the anchor can be transmitted to the ground to be fixed and firmly fixed. Therefore, it is possible to introduce a tension force higher than that of the lock bolt work, which can only introduce a tension force that is as weak as bolt fastening. In addition, since the simple anchor of the present invention adopts a wedge fixing type fixing device, unlike the bolt fixing type lock bolt, when the tension is weakened due to elongation of the tension material or aging of the grout material, etc. You can easily get nervous again.

[0023]

Since the present invention is as described above, the following effects can be obtained. <a> Although it has a structure similar to a lock bolt, it can introduce a higher tension than the lock bolt and can be re-tensioned. <B> Compared to the earth anchor, it is smaller and lighter and is easier to handle during transportation and construction. <C> Even if the drilling length of the anchor holes at the site is slightly different,
The length can be easily adjusted by cutting the strand material, and it is easy to handle on site. <D> Since it has a very simple structure, it can be manufactured at a lower cost than the ground anchor. <E> From the above, it is possible to carry out construction with good construction workability and low construction cost even at a site where higher anchor proof strength is required than with lock bolt construction.

[Brief description of drawings]

FIG. 1 is an explanatory view of an anchor of the present invention.

FIG. 2 is a partially enlarged view of the anchor of the present invention.

FIG. 3 is a cross-sectional explanatory view of a water shut off portion of the present invention.

[Explanation of symbols]

1 ... Simple anchor 20 ... Tensile material 21..Fixed body 24 ... Water stop 30..Fixing tool 40 ... Grout material

Claims (5)

[Claims] 1. A simple anchor for fixing a tension member in an anchor hole through a grout material and for fixing a tension member at a base end of the tension member, wherein the tension member is embedded in the grout material in the anchor hole. A simple anchor comprising a fixing body and one strand material connected to the fixing body, wherein one of the strand materials penetrates the fixing body and is connected. 2. The simple anchor according to claim 1, wherein one of the strand materials penetrating the fixing body is connected by a wedge fixing means. 3. The simple anchor according to claim 1, wherein a wedge fixing means capable of being re-tensioned is provided on the other side of the strand material. 4. The simple anchor according to claim 1, wherein a protrusion is formed on a peripheral surface of the fixing body. 5. A method of constructing a simple anchor, wherein a tension material is fixed in an anchor hole through a grout material, and a proximal end of the tension material is tensioned and fixed, which is one of claims 1 to 4. The method of constructing a simple anchor characterized in that the fixing body is embedded and fixed in the grout material in the anchor hole, and the base end of the strand material is tensioned and wedge-fixed by using the simple anchor.