WO2005100800A1

WO2005100800A1 - Uniformly disposing tool for anchor wedge

Info

Publication number: WO2005100800A1
Application number: PCT/JP2004/005045
Authority: WO
Inventors: Tsutomu Kadotani; Takashi Takagaki; Masato Yamada; Yoshiyuki Matsubara; Motonobu Nishino
Original assignee: Sumitomo (Sei) Steel Wire Corp.
Priority date: 2004-04-07
Filing date: 2004-04-07
Publication date: 2005-10-27
Also published as: CN100489320C; EP1757819A4; EP1757819A1; CN1926339A

Abstract

A uniformly disposing tool for an anchor wedge capable of preventing an additional stress applied to a PC steel material from being deviated by disposing the split pieces of the wedge without being deviated in the circumferential or axial direction and holding the PC steel material by a simple structure, comprising a tubular part (10) fitted to the outside of the PC steel material (PC steel material strand (100)) and projected parts (20) formed at the end part of the tubular part (10) and inserted between the wedge split pieces holding the PC steel material to uniformly dispose the split pieces in the circumferential direction. Since the projected parts (20) are inserted between the wedge split pieces, the split pieces can be uniformly arranged in the circumferential direction.

Description

Specification

Fixing wedge evenly arranged jig

The present invention relates to a jig for uniformly arranging divided pieces of a wedge for fixing an end portion of a PC steel material in a PC structure. Background art

A fixing device using a wedge is known as a structure for fixing a PC steel material such as a PC steel strand to a PC structure. As shown in FIG. 3, this fixing device is composed of a combination of a wedge 200 and an anchor disc 120 or a female cone 130 having tapered holes 121 and 131.

The wedge 200 is usually formed into a truncated cone with a large diameter at one end and a small diameter at the other end by combining two or three divided pieces. When the divided pieces are combined, a circular hole extending in the axial direction is formed at the center of the wedge 200. The PC steel strand 100 is gripped by the wedge 200 in this circular hole. Also, a groove is formed on the outer periphery of the large diameter side of each divided piece. In a state where the divided pieces are combined in a truncated cone shape, an O-ring (not shown) is fitted into this groove so that the divided pieces are bound so as not to be separated.

The PC steel stranded wire 100 whose end is gripped by the wedge 200 is given a predetermined tension by a jack, and is fixed by fitting the wedge 200 into the tapered hole of the anchor disc 120 or the female cone 130. The anchor disk 120 or the female cone 130 is placed on an anchor plate 110 located, for example, on the surface of the concrete structure. It should be noted that a rib cast anchor or a socket may be used instead of an anchor plate. By the way, with such a wedge, there is a problem that the divided pieces are unevenly arranged in the axial direction, and in some cases, the circumferential direction of the PC steel stranded wire. As described above, the conventional wedge simply retains the shape of a truncated cone because the divided pieces are bound by an o-ring. As a result, as shown in FIG. 4, the O-ring 140 is easily extended at the time of fixing, and the divided pieces may be shifted in the axial direction or the circumferential direction. For example, when the PC steel strand is bent near the fixing device (when it is not linearly arranged), it is difficult to arrange the split pieces uniformly in the axial direction, and the applied stress on the PC steel strand is also uneven. May work. In particular, wedges used for diagonal cables and outer cables of cable-stayed bridges, which require high fatigue characteristics, have a high level of requirement for the uniform arrangement of each split piece, and further prevention of slippage is required.

On the other hand, Japanese Patent Application Laid-Open No.

A wedge driving device described in JP-A-7-279912 is known. This device is composed of an outer cylinder and a hollow extruded cylinder that is freely slidably accommodated in the outer cylinder. At the tip of the outer cylinder, there are a plate spring for temporarily fixing the divided pieces, and a stopper located between the divided pieces to prevent the circumferential movement of the divided pieces. Disclosure of the invention

However, the technology described in Patent Document 1 has the following problems.

(1) The configuration of the wedge driving device is complicated.

A stopper and a leaf spring are required to keep the divided pieces combined in a truncated conical shape, so the number of parts is large and the configuration of the device becomes complicated.

(2) If the wedge split pieces are bound by o-rings, they cannot be used.

When each divided piece is bound by an O-ring, it is placed at the tip of the outer cylinder The stopper expands the O-ring, and it becomes impossible to bind the divided pieces by the 〇 ring. Also, when the wedge is pushed in by the extrusion cylinder, the leaf spring interferes with the O-ring, and there is a problem that the wedge is not smoothly pushed out and the ring comes off.

Therefore, the main object of the present invention is to arrange the divided pieces without displacement in the circumferential direction or the axial direction and to grip the PC steel material with a simple configuration, thereby preventing the bias of the applied stress applied to the PC steel material. An object of the present invention is to provide a jig for uniformly disposing a fixing wedge.

Another object of the present invention is to provide an even arrangement of fixing wedges that can be used without any problem even when the wedge split pieces are bound by o-rings and that prevent the split pieces from shifting in the circumferential or axial direction. The purpose is to provide jigs.

The present invention achieves the above object by using a jig in which the divided pieces are evenly arranged when the wedge is inserted into the taper hole.

That is, the jig of the present invention is provided between the cylindrical portion fitted on the outer side of the PC steel material and the end of the cylindrical portion, and is inserted between the wedge divided pieces for gripping the PC steel material to surround each divided piece. And a protrusion arranged evenly in the direction.

By using a jig having protrusions arranged evenly at the tip of the cylindrical part, if these protrusions are inserted between the wedge split pieces, the split pieces are automatically and uniformly arranged in the circumferential direction. Therefore, it is possible to resolve the problem by holding the PC steel while the gap has occurred.

The jig of the present invention has a cylindrical portion and a projection. This tubular portion has an inside diameter that allows the passage of the PC steel material. The material of the cylindrical part is such that when the protrusion is inserted between the split pieces of the wedge, the side of the cylindrical part that does not have the protrusion is hit, so that the mechanical strength is sufficient to withstand the impact Have It consists of one thing.

In this cylindrical portion, it is preferable that the end face provided with the protruding portion is formed of a surface orthogonal to the axial direction of the cylindrical portion so that the divided pieces can be evenly arranged in the axial direction. With this configuration, when the projection is inserted between the split pieces and the jig is driven into the wedge side, the end face of the cylindrical portion comes into contact with the end face on the large diameter side of the wedge, and each split piece shifts in the axial direction It can be arranged without any.

On the other hand, the protruding portion is a plurality of protruding pieces protruding from the end of the cylindrical portion. Each projection is evenly arranged in the circumferential direction of the cylindrical portion. Usually, each protruding portion is made of the same material as the cylindrical portion and is integrally formed. The number of projections is a number corresponding to the number of gaps between the divided pieces. For example, if a wedge is composed of three divided pieces, the number of gaps is three, and the number of protrusions is three.

It is preferable that the shape of the protrusion is a tapered shape that becomes thinner toward the tip. By making the protrusions tapered, the protrusions can be easily inserted between the divided pieces and easily removed.

The above jig is used by inserting a projection between the divided pieces constituting the wedge and hitting the end of the cylindrical portion opposite to the projection. By inserting the projections between the divided pieces, the divided pieces can be evenly arranged in the circumferential direction. In addition, since the end face of the cylindrical portion provided with the projection abuts on each of the divided pieces, each of the divided pieces can be arranged without being shifted in the axial direction.

In this jig, a projection may be inserted between the divided pieces in advance, and then the divided pieces may be inserted into a tapered hole such as a female cone, or the divided pieces may be inserted into a tapered hole such as a female cone. After that, a projection may be inserted between the divided pieces.

As described above, according to the jig of the present invention, the following effects can be obtained. (1) By using a jig having protrusions evenly arranged at the tip of the cylindrical portion, if the protrusions are inserted between the wedge split pieces, the split pieces will automatically move in the circumferential direction. It will be evenly arranged, and it will be possible to solve the problem of gripping the PC steel with the gap.

(2) The jig of the present invention has an extremely simple structure in which a plurality of protrusions are formed at the end of the cylindrical portion, and has a simple use in which the protrusions are inserted between the wedge split pieces. The method can suppress the displacement of the divided pieces. In particular, the jig of the present invention can be used without any problem even when the wedge split pieces are bound by a ring.

(3) By making the shape of the projection tapered so as to become thinner toward the tip, the projection can be easily inserted between the wedge split pieces and pulled out.

(4) By forming the end face of the tubular portion provided with the projection with a surface orthogonal to the axial direction of the tubular portion, the divided pieces can be evenly arranged in the axial direction. Brief Description of Drawings

1 (A) is an end view of the jig of the present invention, and FIG. 1 (B) is a front view thereof. FIG. 2 is an explanatory view showing a state in which the jig of the present invention is fitted between wedge split pieces. FIG. 3 (A) is an explanatory diagram of a fixing structure using an anchor disk, and FIG. 3 (B) is an explanatory diagram of a fixing structure using a female cone. FIG. 4 is an explanatory view showing the displacement of the divided pieces constituting the wedge.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described.

Structure of the jig> FIG. 1 shows the jig of the present invention, wherein (A) is an end view thereof, and (B) is a front view thereof.

This jig has a cylindrical portion 10 and a protruding portion 20 protruding from one end thereof. The cylindrical portion 10 is a cylindrical member having an inner diameter into which the PC stranded wire is inserted and having an outer diameter slightly smaller than the outer diameter of the wedge. In this example, the cylindrical portion 10 was formed of a carbon steel pipe for machine structural use (STKM13A) having an outer diameter of 25.4 mm and an inner diameter of 19.4 mm.

A protrusion 20 is formed on one end of the cylindrical portion 10. In this example, the three protrusions 20 are evenly arranged in the circumferential direction at intervals of 120 °. The protruding portion 20 is also made of the same material as the tubular portion 10 and is integrated with the tubular portion 10.

The protruding portion 20 has a tapered shape in which the width at the base side is wide and the width becomes narrower toward the tip side. Its length is 10 mm, the width at the base is 4 mm, and the width at the tip is 3 mm.

Further, one end side of the tubular portion 10 on which the projecting portion 20 is formed, that is, a portion where the projecting portion 20 is not provided on the end surface of the tubular portion is formed of a surface orthogonal to the axial direction of the tubular portion 10.

This jig is used in the following procedure.

As a premise, as shown in FIGS. 3 and 4, a wedge 200 having one end on the large diameter side and the other end on the small diameter side is prepared. This wedge 200 is constructed in a nearly truncated cone shape by combining three divided pieces. Combine such divided pieces into a truncated cone shape, and insert an O-ring from the outer periphery of the divided pieces so that each divided piece does not fall apart.

As shown in FIG. 2, insert the projection 20 of the jig into the gap between the divided pieces (wedge 200) in the combined state. The protrusion 20 is thinner toward the tip. —Because it is configured as a single piece, it can be easily inserted into the gap between the divided pieces. Since the projections 20 are evenly arranged in the circumferential direction of the cylindrical portion 10 due to the insertion of the jig into the gap, the divided pieces are also equally arranged in the circumferential direction.

Further, when the protrusion 20 is inserted into the gap between the divided pieces, the surface of the cylindrical portion end face without the protrusion 20 comes into contact with the wedge large diameter side end face. Due to this contact, the divided pieces are arranged without being shifted in the axial direction.

In this state, the wedge 200 combined with the jig is fitted into the female cone 1 30. As shown in FIG. 2 or FIG. 3 (B), the female cone 130 is formed such that a tapered hole 1 31 is formed, and the PC steel stranded wire 100 protrudes from the tapered hole 1 31.

The wedge 200 combined with the jig is inserted into the tapered hole 131 without any deviation in either the circumferential direction or the axial direction. No deviation occurs in the divided pieces. Then, the other end of the cylindrical portion 10, that is, the side having no protrusion is hit with a hammer or the like, and a wedge is pressed into the tapered hole 131. Then, remove the jig from wedge 200. Industrial applicability

In particular, the divided pieces of the wedge should be

It is related to a jig that can be arranged without delay.

Claims

The scope of the claims

1. A tubular part fitted on the outside of the PC steel,

A fixing wedge provided at the end of the cylindrical portion and having a projection inserted between the wedge split pieces for gripping the PC steel material to uniformly arrange the split pieces in the circumferential direction. Jig evenly arranged.

2. The fixing wedge evenly arranged jig according to claim 1, wherein the projection has a tapered shape that becomes thinner toward the tip.

3. The end face of the cylindrical portion provided with the protrusion is formed of a surface orthogonal to the axial direction of the cylindrical portion so that the divided pieces can be evenly arranged in the axial direction. The fixing wedge equalizing jig according to item 1 or 2.