JPH0914224A - Connecting of tension member and its connecting member - Google Patents

Abstract

PURPOSE: To facilitate centering at end portions of tension members in connecting tension members used in anchor or PC structure. CONSTITUTION: In connection of tension members through a coupler by mutually butting tension members at end portions, fitting members, 6, 7 for centering are disposed at end portions of tension members 1(A, B), so that the connection is made in centering by the centering means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a method of connecting a tensile member for anchors or a tensile member used for connecting a PC structure, and a structure of a connecting member used in the method.

[0002]

2. Description of the Related Art Conventionally, in connection of tension members, for example,
To connect the tension member for the anchor, as shown in FIG. 8, a sleeve 2 having a threaded portion 3 on its outer peripheral portion is attached to one end of a strand 1 made of PC steel wire.

Further, there is provided a cylindrical metal coupler 4 in which a threaded portion 5 to be screwed into the threaded portion 3 of the sleeve 2 is engraved over the entire circumference of the inner peripheral wall surface.

Then, the coupler 4 is screwed into the sleeve 2 of the one strand, and the entire coupler 4 is screwed in so as not to project from the end surface of the sleeve 2.

Next, the end surface of the sleeve 2 of the other strand is butted against the end surface of the sleeve 2 of the one strand. At this time, the butted sleeves 2, 2 are set so that their center positions are aligned with each other.

Then, the coupler 4 which has been screwed into one sleeve 2 side is rotated in the opposite direction to the case where it is screwed in, and approximately half of the coupler 4 is screwed onto the sleeve 2 of the other strand. Thus, the connected state shown in FIG. 8 is obtained.

[0007]

However, in the above-described method for connecting tension members, the weight of the strand 1 and the sleeve 2 is as high as 20 kg to 30 kg depending on the location of the work, and the sleeves 2 and 2 at the end portions. It is not easy for an operator to work out the center position and connect with the coupler 4, and it is difficult and unworkable to connect with one of the tension members inclined. was there.

Thus, the conventional method for connecting tension members is as follows:
It was difficult to locate the center of the end of the tension material, and there was a problem to be solved in workability of the connecting work.

[0009]

The gist of the method for connecting tensile members according to the present invention is to connect the tensile members by connecting ends of the tensile members to each other through a coupler. That is, an engaging means for positioning the center is provided at the end portion of the tension member, and the center is positioned by the engaging means for connection.

The engaging means comprises a recess provided in an end surface of one tension member and a protrusion provided in an end surface of the other tension member so as to fit into the recess; The means is magnetic.

The gist of the connecting member of the tension member of the present invention is that the sleeve is fixed to the end of the tension member and has a threaded portion on the outer peripheral portion, and the inner peripheral surface of the tubular body is screwed to the threaded portion of the sleeve. And a coupler having a threaded portion, which is a connecting member of a tension member, and an engaging means for positioning a center is provided on an end surface of the sleeve.

The engaging means comprises a recess provided on the end surface of the sleeve of one tension member and a projection provided on the end surface of the sleeve of the other tension member so as to fit into the recess; The engaging means, a recess provided at the end of the tension member,
It is composed of a middle piece provided with a projection fitting into the recess; and the engaging means is magnetic.

[0013]

According to the method for connecting tension members according to the present invention, the operator can easily position the center of the tension member by allowing the operator to bring the sleeves into engagement with each other by engaging the sleeves with the engagement unit. . Further, since the engaging means is formed by the concave portion and the protruding portion, it is easy to engage. Further, if the engaging portion is magnetized, the magnetic force of the engaging portion can be expected to exert an attracting action when the sleeves are engaged with each other, which facilitates the engagement.

[0014]

Next, an embodiment according to the present invention will be described in detail with reference to the drawings. For easy understanding, portions corresponding to the conventional example will be denoted by the same reference numerals as those in the conventional example.

In the first embodiment of the present invention, as shown in FIGS. 1 to 3, a sleeve 2 having a threaded portion 3 on its outer peripheral portion is fixed to the end portion of a tension member 1 by caulking or the like.

At the time of fixing, as shown in FIG. 2, one of the tension members 1 is provided with a metal stopper 9 on the end face of the tension member A, and the metal stopper 9 is recessed inside the sleeve 2. Squeeze. Thus, the recess 6 for engagement is formed.

Further, a metal stopper 7 is arranged on the end face of the other tension member B, and a part of the metal stopper 7 is projected outward from the end face of the sleeve 2 so that the other tension member 1 is attached. The sleeve 2 is caulked and fixed. Thus, the protrusion for engagement is formed.

The coupler 4 is made of metal,
A threaded portion 5 to be screwed into the threaded portion 3 of the sleeve 2 is formed in a tubular body engraved over the entire circumference of the inner peripheral wall surface.

In the connecting work, for example, as shown in FIG. 6 to FIG. 7, the concave portion 6 of one tension member A fixed to the girder 10 side of the PC bridge or fixed to the ground 11 side is provided. With respect to the sleeve 2, the coupler 4 is previously screwed onto the sleeve 2 having the metal plug 7 of the tension member B so as not to project from the end surface of the sleeve 2.

Next, an operator lifts the other tension member B, and a part of the metal plug 7 protruding from the sleeve 2 is fitted into the recess 6 of the sleeve 2 on the one tension member A side. Let

By fitting the recess 6 and the protrusion of the metal plug 7, the tension members A and B can be centered.
Further, the engagement of the engagement means allows the operator to easily maintain the state.

Then, the sleeve 2 of the other tension member B
The coupler 4 that has been screwed onto the sleeve 2 is rotated in the direction opposite to that when the coupler 2 is screwed onto the sleeve 2 so as to straddle the sleeve 2 of the one tension member A and the sleeve 2 of the other tension member B. So that they are screwed together by the coupler 4 in about half lengths.

Further, if the connecting portion is required to be waterproof, it is filled with a resin material or caulking material to be connected so as to be waterproof. In addition to the water-stopping effect on the metal plug, it also prevents the grout from blowing out.

Next, a second embodiment of the present invention relates to a modification of the metal stoppers 7 and 9 as shown in FIG. 4, in which the protrusion 13 of the metal stopper 12 is provided with a tapered surface 13a. It is a thing. Further, in the concave portion 6 of the metal plug 14, a taper surface 14a is provided on the wall surface forming the concave portion 6.

In this way, the protrusions 13 that fit with each other are provided.
With the tapered surfaces 13a and 14a in the recess 6 and the recess 6, the opening of the recess 6 is greatly expanded, and the metal plugs 12 and 14 of the one tensile member and the other tensile member are easily fitted to each other. The connection workability of is improved.

Next, a third embodiment of the present invention relates to a modification of the metal stoppers 7 and 9 in the first embodiment. As shown in FIG. 5, a metal stopper 15 having a recess 6 is provided. After forming, the metal plug 15 is arranged at the end of the tension member 1 and the sleeve 2 is caulked.

In this case, the metal plug 15 is flush with the end face of the sleeve 2 and embedded therein.

Then, the middle piece 16 fitted in the recess 6 of the metal plug 15 is formed. In this connection work, in consideration of the stability of the work, for example, the middle piece 1 is placed in the recess 6 of the metal plug 15 of the sleeve 2 fixed to the ground 11 side.
It is preferable that 6 is inserted and the sleeve 2 of the other tension member B is engaged and the center position is set.

Further, the middle piece 16 may be provided with tapered surfaces at both ends thereof.

According to the third embodiment, unlike the above-mentioned embodiment, both ends of the tension members A and B to be connected have the same shape, and there is no mistake in construction. Further, since one type of metal plug 15 may be fixed within the ends of both sleeves 2 to be connected, component mounting mistakes are eliminated.

The fourth embodiment of the present invention is a metal plug 7, 9, 12, 14, 1 according to the first to third embodiments.
5 or in the middle piece 16, magnetism is applied to form a magnetic body.

In this case, it is proposed that one of the metal stoppers of the engaging means is a magnetic body and the other metal stopper is a magnetically attracted metal body, and both metal stoppers are magnetic bodies. To be done. Further, in the third embodiment, only the middle piece 16 shown in FIG. 5 may be a magnetic body (for example, a permanent magnet).

As described above, since the engaging means provided on the sleeve 2 at the end portion of the tension member to be connected is magnetic,
When the concave portion 6 of the engaging means is engaged with the projection 7 or the projection 13, the attraction force due to the magnetism of the magnetic material is obtained to facilitate the engagement work.

As a fifth embodiment of the present invention, in addition to a type in which a recess and a protrusion are formed by crimping a metal plug on the sleeve, a sleeve in which a recess and a protrusion are machined from the end before caulking in advance Alternatively, the sleeves may be formed by caulking and fixing the sleeves to the end portions of the tension member to form an engaging means for centering the tension member.

As shown in FIG. 6 to FIG. 7, the connecting members as described above are used to connect the tensile member and the tensile member of the next diameter in the bridge girder of the divided construction type PC bridge, or the slope on the ground 11 side. It can be used for connecting a tensile member embedded as an anchor to a tensile member supporting the retaining wall 17, and for connecting other general tensile members.

[0036]

As described above, the method for connecting tension members according to the present invention is a method for connecting tension members in which ends of the tensile members are butted against each other and connected through a coupler, and the ends of the tensile members are connected. Since the center positioning engagement means is provided in the center and the center positioning is performed by the engagement means to connect, the tension member can be centered just by engaging the engagement means. This has an excellent effect that the work of screwing the coupler over the sleeve is facilitated and the workability of the connecting work is improved.

If the engaging means is magnetized, there is an excellent effect that the engaging work facilitates the engaging work.

The connecting member according to the present invention includes a sleeve fixed to the end of the tension member and having a threaded portion on the outer peripheral portion, and a threaded portion on the inner peripheral surface of the tubular body that is screwed into the threaded portion of the sleeve. A coupling member for a tension member composed of a coupler provided with the engaging member for positioning the center on the end surface of the sleeve. It has an excellent effect that it can be positioned.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a first embodiment of a method for connecting tension members according to the present invention.

FIG. 2 is vertical sectional views (a) and (b) showing the structure of the tensile member according to the first embodiment.

FIG. 3 is a front view of the metal stopper according to the first embodiment.

FIG. 4 is a vertical cross-sectional view of a metal stopper according to a second embodiment of the method for connecting tension members of the present invention.

FIG. 5 is a longitudinal sectional view of a metal stopper and a middle piece in a third embodiment of the method for connecting tension members of the present invention.

FIG. 6 is a vertical cross-sectional view of an example in which the connecting member of the tensile member of the present invention is applied to a bridge girder of a PC bridge.

FIG. 7 is an explanatory view of the case where the connecting member of the tensile member of the present invention is used for the anchor on the slope and the supporting tensile member for the retaining wall.

FIG. 8 is a vertical cross-sectional view showing a method of connecting tension members according to a conventional example.

[Explanation of symbols]

 1 tensile member, 2 sleeve, 3 screw part, 4 coupling, 5 screw part, 6 concave part, 7, 9, 12, 14, 15 metal stopper, 13 protrusion part, 13a, 14a taper surface, 16 middle piece.

Claims (8)

[Claims] 1. A method of connecting tension members, in which ends of the tension members are butted against each other and are connected via a coupler, wherein the tension member ends are provided with engaging means for centering, and the engaging means is used. A method for connecting tension members, which is characterized in that the center position is set for connection. 2. The engaging means comprises a recess provided in an end face of one tension member and a protrusion provided in an end face of the other tension member so as to fit in the recess. The method for connecting tensile members according to claim 1, wherein 3. The tension member according to claim 1, wherein the engaging means comprises a recess provided at an end portion of the tension member and an intermediate piece provided with a protrusion fitting to the recess. Connection method. 4. The method for connecting tension members according to claim 1, wherein the engaging means is magnetic. 5. A sleeve, which is fixed to an end portion of a tension member and has a threaded portion on an outer peripheral portion, and a coupler having an inner peripheral surface of a tubular body, which has a threaded portion screwed into the threaded portion of the sleeve. A connecting member for a tensile member, wherein the end face of the sleeve is provided with an engaging means for positioning a center. 6. The engaging means comprises a recess provided on the end surface of the sleeve of one tension member and a projection provided on the end surface of the sleeve of the other tension member so as to fit into the recess. The connecting member for a tensile member according to claim 5, which is characterized in that. 7. The tension member connecting member according to claim 6, wherein a tapered surface is provided at a fitting portion between the recess and the protrusion. 8. The tension member connecting member according to claim 5, 6 or 7, wherein the engaging means is magnetic.