JP2000144729A - Anchor anchorage-body structure, into which prestress is introduced - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold stable anchorage force for a prolonged term by tying a several number of small anchorage bodies by introducing each prestress by a series of drag wires and using the anchorage bodies as one anchor anchorage body. SOLUTION: A several number of small anchorage bodies 1-3 are tied by introducing prestress by one or a series of drag wires 4 respectively, and the small anchorage bodies are employed as one anchor anchorage body. Consequently, a several number of the tied small anchorage bodies 1-3 have axial force respectively, each small anchorage body 1-3 is released from anchorage materials 6, 7 by applying previously added emergency force by anchor works, and axial force is transmitted successively to the small anchorage bodies 1-3 before one anchorage body respectively. Accordingly, skin direction is dispersed to each small anchorage body 103, anchor structure resulting in a natural anchorage ground is formed, and stable anchorage force can be held for a prolonged term.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anchor work, in which a prestress is introduced into an anchor fixing body, and then grouting and tensioning work of the anchor fixing section are carried out, so that the circumference of the anchor fixing body is improved. This enables dispersion of surface frictional force.

[0002]

2. Description of the Related Art Conventionally, when tension is applied to an anchor during anchor work, peripheral frictional force concentrates on a part of the anchor fixing body, so that the fixed ground gradually collapses and the anchoring force is reduced. There was a problem with the reliability of long-term anchor force. The cause of this peripheral frictional force concentration is that the fixing body is constrained by the surrounding grout and fixing ground by adhesive force and frictional force, but since it is not a completely rigid body, it is only at the local part where the tension line is connected. Is elastically deformed and bears the load, and the axial force is not transmitted to other parts.

In recent years, a type in which several anchor fixing members are tensioned with tension lines having different lengths to disperse a frictional force has been developed. Therefore, it is necessary to calculate the balance of the forces applied as a whole and to be nervous, and the management of the nervous force and the labor of the nervous work are complicated. Further, since the tension line is arranged around the fixing member, there is a limit to the fixing member that can be installed, and there is a risk that the tension line may be broken when a load is concentrated on one fixing member.

[0004]

The object of the present invention is to reduce the work by making it possible to freely and easily set the dispersion number and the dispersion load of the peripheral frictional force applied to the anchor fixing member.
An object of the present invention is to provide an anchor capable of reliably transmitting a force to a fixed ground with a reasonable frictional force and maintaining a stable force for a long time.

[0005]

According to the present invention, in order to achieve the above-mentioned object, several anchor fixing members are connected by introducing a prestress with one or a series of tension lines, and these are fixed as one fixing member. It is characterized by being used.

In the fixing body of the present invention, since several connected fixing bodies introduce a prestress, each of them has an axial force. However, a tension greater than that applied in advance is applied by an anchoring operation. As a result, the individual fixing members are released from the fixing material, and the axial force is sequentially transmitted to the immediately preceding fixing member.
As a result, the peripheral frictional force is dispersed in the individual fixing members, and the anchoring structure can be easily formed on the fixing ground.

[0007]

FIG. 1 is a conceptual cross-sectional view of an invented anchor fixing body structure, showing an example in which three fixing bodies are provided.
Reference numerals 1, 2, and 3 denote fixing bodies (hereinafter, referred to as small fixing bodies). No. 4 introduces pre-stress to the small fixing body,
It is not limited whether the number of the tension lines to which the anchor tension is applied is one or connected. Reference numeral 5 denotes a connecting member for retaining the tension line 4, and reference numerals 6 and 7 denote fixing members for maintaining the tension of the tension line 4 to introduce prestress into the small fixing members 1 and 2, respectively. In any case, the material, size, length, individual detailed structure, mutual member ratio, and the like are not limited.

FIG. 2 is a cross-sectional view showing a stress state when a prestress is applied to three small fixing bodies. Although the stress applied to each of the small fixing members is vertically symmetric in the drawing, they are collectively described above. First, a tension line 4
Is fixed by the fixing material 7 by applying a tension P1, and a prestress of P1 is introduced. Next, the small fixing body 2 is connected to the small fixing body 1, and a P2 prestress is introduced into the small fixing body 2 in the same manner. Further, the small fixing member 3 is connected to the small fixing member 2. A fixing body in which these small fixing bodies 1, 2, and 3 are connected is inserted into an anchor hole, and after grouting, an anchor tension P is applied.

FIG. 3 shows an anchor tension P applied to the fixing body of FIG.
FIG. 4 is a cross-sectional view showing a stress state when a stress is applied. The upper vertical hatch shows a rough distribution of the peripheral frictional force that the fixing body receives from the peripheral fixing portion. If the tension is set so as to satisfy P ≧ P1 ≧ P2, the fixing members 6 and 7 release the stress applied to the small fixing members 1 and 2 respectively, and the small fixing member 1 transfers P1 to the small fixing member 2.
The small fixing body 2 transmits P2 to the small fixing body 3 as an axial force. At this time, assuming that peripheral frictional forces applied to the small fixing members 1, 2, and 3 are S1, S2, and S3, respectively, S1 = P-P1 S2 = P1-P2 S3 = P2 S1
+ S2 + S3 = P, and the dispersion of the peripheral frictional force that resists the anchoring force can be freely set by the introduced prestressing force. Similarly, in the case of multiple units, the dispersion of the frictional force can be freely set by changing the prestress force introduced into the small fixing member.

[0010]

According to the present invention, since the number of dispersion and dispersion stress of the peripheral frictional force applied to the anchor fixing member can be freely set, the maximum frictional force can be greatly reduced, and a stable anchoring force can be maintained for a long time. It can also handle anchors on weak ground. In addition, since the anchor work is performed with one pulling line, the tension management is simple and the work is easy.

[Brief description of the drawings]

FIG. 1 is a conceptual sectional view of an anchor fixing body structure.

FIG. 2 is a diagram showing a stress state of an anchor fixing body after introducing a prestress.

FIG. 3 is a diagram showing a stress state of a fixing body and a peripheral surface frictional force when an anchor fixing body is inserted into an anchor hole, grouted, and an anchoring force is applied to a tension line.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Small fixing body 2 Small fixing body 3 Small fixing body 4 Tension line 5 Connecting material 6 Fixing material 7 Fixing material

Claims (1)

[Claims] 1. An anchor fixing body structure capable of dispersing a frictional force on a peripheral surface by introducing a pre-stress.