JPH01312164A - Retension and anchoring method of tensile material - Google Patents

Abstract

PURPOSE:To retense and anchor a tensile material easily by tensing the tensile material and pushing down a wedge pushing sheath by an anchored cylinder of a jack to push the wedge into a through-hole of an anchor disc. CONSTITUTION:A new tensile material 2 is connected to the end of an existing tensed tensile material 11 by means of a connection metal fixture 3. Then, the tensile materials 1 and 2 are passed through a wedge pushing sheath 8, inserting the metal fixture 3 into the sheath 8, mounting wedge pushing blocks 9 on the up and down ends of the sheath 8. After that, a ram-chair 12 is provided on an anchor disc 10, and the upper side block 9 is pierced into a through- hole of the chair 12 together with the tensile material 2. The tensile material 1 is pierced into a jack 14, putting the jack 14 on the chair 12, and the tensile material 1 is fixed to a tensile cylinder 15 by a wedge 16. In addition, the tensile material 1 is tensed by the jack 14, and after introducing a prestress, an anchored cylinder 17 is lowered to push down the sheath 8, and a wedge 11 is pushed into a through-hole of the disc 10 again.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for re-tensioning and fixing tendons installed as ground anchors, etc., when tensioning them again.

[Conventional technology]

Generally, in the prestressed concrete construction method, the tendons may be re-tensioned to reintroduce prestress into the concrete frame.

Further, there is a wedge method as a method for fixing and fixing the ends of the tendon material. This wedge method is often adopted because it is relatively easy to construct.

(Problem to be Solved by the Invention) By the way, when the ends of the tension material are fixed by the wedge method, it is relatively easy to re-tension the tension material that has been fixed and fixed by -degree, but in many cases. Initially, when fixing and fixing the ends of the tendons, the ends of the tendons are cut short, so it is not easy to tension and fix the tendons again.

However, if the ends of the tendons are made long, they become a nuisance and their disposal is troublesome.

This invention was proposed in order to solve the above-mentioned conventional problems, and it is possible to re-tension the tendon material that has been fixed and fixed by the wedge method, and to reduce the tension when fixing and fixing the end part. It is an object of the present invention to provide a method for re-tensioning and fixing tensioning material, which can easily tension the material and fix and fix the ends.

[Means to solve the problem]

This invention relates to a method for re-tensioning tendons for ground anchors, etc., in which a new tendon is connected to the end of the tendon, which has been anchored and fixed by a wedge method, using a connecting fitting, and the said tendon is pushed into the sheath by the wedge method. and install the push-in sheath inside the ram chair,
A center hole jack is installed on the ram chair, the tension cylinder of the center hole jack is used to tension the tension material, and the fixing cylinder of the center hole jack is then used to push down the wedge pushing sheath to tighten the tension material. This objective is achieved by pushing the wedge, which is anchored and fixed, back into the through hole of the anchor disk.

〔Example〕

Hereinafter, the method for re-tensioning and fixing tendons according to the present invention will be explained step by step based on FIGS. 1 to 8.

(2) Connect a new tension material 2 of a predetermined length to the end of the tension material 1, which has already been tensioned and fixed/fixed by the wedge method, using two connecting fittings 3.3.

The connecting fitting 3.3 is formed into a columnar shape, and a through hole 4.4 in the shape of several cones is formed in the center.

Also, one end of the connecting fitting 3.3 has a male threaded portion 5.
However, a female threaded portion 6 is formed at the other end, and by screwing the male threaded portion 5 and the female threaded portion 6 together, the connecting fittings 3.3 can be connected as one.

In such a configuration, in order to connect the tendons 1 and 2, the end of the tendon 1.2 is inserted into the through hole 4.4 of the connecting fitting 3.3, and the wedge 7 is inserted into the through hole 4. The connecting fittings 3.3 are attached to the ends of the tendons 1 and 2 by insertion, and the connecting fittings 3.3 are connected by screwing the male threaded portion 5 and the female threaded portion 6 together.

- After connecting the tension members 1 and 2, pass the tension members 1 and 2 through the wedge pushing sheath 8 and connect the connecting fitting 3.
3 into the wedge pushing sheath 8.

The wedge-pushing sheath 8.8 has a male thread 5 formed at one end and a female thread 6 formed at the other end. By screwing the male threaded portion 5 and the female threaded portion 6 together, the wedge pushing sheath 8.8 can be connected together.

A wedge pushing block 9.9 is attached to the upper and lower ends of the wedge pushing sheath 8.8.

The lower wedge pushing block 9 of the upper and lower wedge pushing blocks 9 holds the tension material 1 on the anchor desk 1.
0 onto the wedge 11 fixed and fixed in the through hole 10a.

■ Next, a ram chair 12 is placed on the anchor desk 10.
Set up.

The ram chair 12 serves as a reaction force receiver when tensioning the tension material 1, and is formed in a cylindrical shape, with a plurality of through holes 13 formed at the upper end.

Then, push the upper and lower wedge blocks 9 into the through hole 13.
．． 9, the upper wedge pushing block 9 is passed through together with the tension material 2.

■ Next, add tension material 1 to the center hole jack 14.
At the same time, the center hole type jack 14 is placed on the ram chair 12.

Subsequently, the tension material 1 is fixed to the tension cylinder 15 of the jack 14 with a wedge 16.

■ Subsequently, the tension material 1 is tensioned using the center hole jack 14. When the tendon 1 is tensioned, the wedge 11 in the anchor desk 10 is pulled out and prestress is introduced into the tendon 1 again.

■ Subsequently, after introducing a predetermined tension force, the wedge pushing sheath 8 is pushed down by lowering the fixing cylinder 17 of the jack 14, and the pulled out wedge 11 is pushed into the through hole jOa of the anchor desk 10 again to tighten the tension material. Fix and fix the end of 1 again.

Hereinafter, similar operations are performed on other tendons.

E Effects of the Invention 1 This invention has the above-mentioned configuration and has the following effects.

According to this method, the tensioning material can be re-tensioned and fixed/fixed continuously, so the workability is extremely high.

Further, since the work can be carried out without difficulty even if the ends of the tendons are a little short, there is no need to intentionally make the ends of the tendons longer when fixing and fixing the ends of the tendons at first. Therefore, the ends of the tension material after being fixed and fixed can be stored compactly.

[Brief explanation of the drawing]

Figures 1 to 8 show an embodiment of this invention.
Figures 1 to 5 are process diagrams showing the working method of this invention;
7 is a perspective view of the wedge push-in sheath, and FIG. 8 is a perspective view of the connecting fitting. ■, 2... Tension material, 3... Connection fitting, 4... Through hole, 5... Male threaded part, 6... Female threaded part, 7... Wedge, 8... Sheath for pushing wedge, 9 ... Wedge push block, 10 ... Anchor desk, 11
... Wedge, 12... Lamb chair, 13... Through hole, 14... Center hole type jack, 15...
- Tension cylinder, 16... Wedge, 17... Fixing cylinder.

Claims (1)

[Claims] (1) Connect a new tendon to the end of the tendon that has been fixed and fixed by the wedge method using a connecting fitting, pass the tendon through the wedge-pushing sheath, and erect the sheath into the ram chair. , a center hole type jack is installed on the ram chair, the tension material is tensioned by the tension cylinder of the center hole type jack, and the wedge pushing sheath is then pushed down by the anchoring cylinder of the center hole type jack to tension the tension material. A method for re-tensioning and fixing tendon material, which is characterized by pushing the wedge that is fixing and fixing the material into the through hole of the anchor desk again.