JP2887092B2 - Connection method of tensile material - Google Patents

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 anchor 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 the connection of tensile members, for example,
In order to connect the tensile 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 strand.

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

[0004] The coupler 4 is screwed into the sleeve 2 of the one strand, and the entire coupler 4 is screwed so as not to protrude from the end face of the sleeve 2.

Next, the end face of the sleeve 2 of the other strand is butted against the end face of the sleeve 2 of the one strand. At this time, the butted sleeves 2 and 2 are set so that their center positions match.

[0006] Then, by rotating the coupler 4 screwed into the one sleeve 2 side in the opposite direction to the case where the coupler 4 is screwed, substantially half of the coupler 4 is screwed into the sleeve 2 of the other strand. Thus, the connection state shown in FIG. 8 is obtained.

[0007]

However, in the above-described method of connecting the tensile members, the weight of the strand 1 and the sleeve 2 may be as large as 20 kg to 30 kg depending on the construction site. It is not easy for the operator to locate the center position and connect with the coupler 4, and it is more difficult to connect with one of the tension members being inclined, and the work efficiency is poor. was there.

As described above, the conventional connecting method of the tensile member is as follows.
It was difficult to locate the center of the end of the tensile member, and there was a problem to be solved in the workability of the connection work.

[0009]

The gist of the present invention for solving the above-mentioned problems in the method for connecting tensile members according to the present invention is a method for connecting tensile members in which ends of the tensile members are abutted to each other and connected via a coupler. And the end of the tensile material surrounds the end
And a sleeve with a thread on the outer periphery is swaged
The sleeve is fixed when the sleeve is swaged.
The stopper is recessed inside the connection end of the sleeve.
Or crimped while projecting outward,
Center position on both ends of the tensile material to be connected.
A projection recess and a projection are provided, and the recess and the projection are
Position the tension member at the center and set one tension member end in advance.
Center the coupler that was screwed into the sleeve of the part
The tension member is screwed over both sleeves after positioning.
Is to connect.

[0010] The fitting portion between the recess and the projection is tapered.
Surface is provided; and the metal stopper is magnetic
That is.

[0011]

[0012]

[0013]

According to the method for connecting a tensile member according to the present invention, meta
The stopper is recessed inside the connection end of the sleeve.
Or crimped while projecting outward,
Center position on both ends of the tensile material to be connected.
A concave portion for projection and a protruding portion, and
And centering of the tensile material with the projection
Thus, the center position of the tensile member can be easily determined. A sleeve that is crimped to the end of the tensile material and deformed.
Even when the metal plug is used to easily engage the recess and projection
Can be formed. Furthermore, if the engaging portion is magnetic, the magnetic force of the engaging portion can be expected to exert an attracting action when the sleeves are engaged with each other, so that the engagement is further facilitated.

[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 the outer periphery is fixed to an end of a tensile member 1 by means such as caulking.

At the time of the fixing, as shown in FIG. 2, a metal plug 9 is arranged on the end face of one of the tensile members A of the tensile member 1, and the metal plug 9 is recessed inside the sleeve 2. Caulking. Thus, the recess 6 for engagement is formed.

A metal plug 7 is disposed on the end surface of the other tensile member B, and a part of the metal plug 7 projects outward from the end surface of the sleeve 2 so that the other tensile member 1 is attached to the other tensile member 1. The sleeve 2 is crimped and fixed. In this way, a projection 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 cylindrical body engraved over the entire inner peripheral wall surface.

In the connection work, for example, as shown in FIGS. 6 and 7, the concave portion 6 of one tensile member A fixed to the girder 10 side of the PC bridge or the ground 11 side is provided. The coupler 4 is previously screwed into the sleeve 2 having the metal plug 7 of the tensile member B so as not to protrude from the end face of the sleeve 2.

Next, an operator lifts the other tensile member B and fits a part of the metal plug 7 protruding from the sleeve 2 into the concave portion 6 of the sleeve 2 on the one tensile member A side. Let it.

The fitting of the recess 6 and the projection of the metal plug 7 allows the tensile members A and B to be positioned at the center.
Further, the worker can easily maintain the state by the engagement of the engagement means.

Then, the sleeve 2 of the other tensile member B is used.
Is rotated in a direction opposite to that when the coupler 4 is screwed onto the sleeve 2 so that the coupler 4 straddles the sleeve 2 of the one tension member A and the sleeve 2 of the other tension member B. Then, a state is established in which the couplers 4 are screwed approximately by half in length.

Further, if the connecting portion needs to be water-stopping, it is filled with a resin material or a caulking material and connected to provide water-stopping. In addition, the metal stopper not only has a water stopping effect, but also prevents grout from blowing out.

Next, a second embodiment of the present invention relates to a modification of the metal plugs 7 and 9 as shown in FIG. It is a thing. Further, in the concave portion 6 of the metal plug 14, a tapered surface 14a is provided on a wall surface forming the concave portion 6.

As described above, the protrusions 13 fitted to each other
And the concave portion 6, the presence of the tapered surfaces 13 a, 14 a greatly widens the opening of the concave portion 6, so that the metal plugs 12, 14 of one tensile member and the other tensile member can be easily fitted to each other. This improves the connection workability.

Next, a third embodiment of the present invention relates to a modification of the metal plugs 7, 9 in the first embodiment. As shown in FIG. Then, the metal stopper 15 is arranged at the end of the tension member 1 and the sleeve 2 is crimped.

In this case, the metal stopper 15 is embedded and caulked while being flush with the end surface of the sleeve 2.

Then, a middle piece 16 to be fitted into the concave portion 6 of the metal plug 15 is formed. In this connection operation, in consideration of the stability of the operation, for example, the middle frame 1 is inserted into the concave portion 6 of the metal plug 15 of the sleeve 2 fixed to the ground 11 side.
It is preferable that the sleeve 6 of the other tension member B is engaged and the center position is determined by engaging the sleeve 2 of the other tension member B.

The middle frame 16 may be provided with tapered surfaces at both ends.

According to the third embodiment, unlike the previous embodiment, both ends of the tensile members A and B to be connected have the same shape, and there is no construction error. In addition, since one type of metal plug 15 may be fixed inside the ends of both sleeves 2 to be connected, mounting errors of components are eliminated.

The fourth embodiment of the present invention is the same as the metal plugs 7, 9, 12, 14, 1 in the first to third embodiments.
In the fifth or middle frame 16, magnetism is applied to make a magnetic material.

In this case, it has been proposed that one of the metal plugs of the engagement means is made of a magnetic material and the other metal plug is made of a metal body that is magnetically attracted, and that both metal plugs are made of a magnetic material. Is done. Further, in the third embodiment, only the middle frame 16 shown in FIG. 5 may be made of a magnetic material (for example, a permanent magnet).

As described above, since the engaging means provided on the sleeve 2 at the end of the tensile 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, an attraction force due to the magnetism of the magnetic material is obtained, and the engagement operation is facilitated.

As a fifth embodiment of the present invention, in addition to a type in which a concave portion and a protruding portion are formed by caulking a sleeve with a metal stopper, a sleeve in which a concave portion and a protruding portion are formed in an end portion before caulking. Are formed, and the sleeve is caulked and fixed to the end of the tensile member, so that it can be used as an engagement means for centering the tensile member.

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

[0036] As described above, connecting method of a tensile member according to the present invention, there is provided a tension member connecting method of connecting via the coupler butt end of the tension member to each other, the tension member ends Around the end and a threaded portion on the outer periphery
The fixed sleeve is swaged and fixed.
When caulking the sleeve, attach the metal stopper to the connection end of the sleeve.
In a state of being recessed inside or protruding outside
Caulked and fixed, so that both connecting
At the end of the tensile material, a recess and projection are provided for centering.
The tension member is projected to the center position by the recess and the projection.
And then screw it into the sleeve at the end of one of the tension members in advance.
The existing coupler to both sleeves after the center position
Since the tension member is connected by being screwed over, even if the sleeve is deformed by being caulked by the tension member
An engaging means for connection is easily formed, whereby the center position of the tension member can be set, and the work of screwing the coupler over both sleeves is facilitated, and the workability of the connection work is improved. It works.

If the engaging means is magnetic, there is an excellent effect that the engaging operation is facilitated by the suction action.

[0038]

[Brief description of the drawings]

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

FIGS. 2A and 2B are longitudinal sectional views showing the structure of the tensile member according to the first embodiment. FIGS.

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

FIG. 4 is a longitudinal sectional view of a metal plug in a second embodiment according to the method for connecting a tensile member of the present invention.

FIG. 5 is a longitudinal sectional view of a metal plug and a middle piece in a third embodiment according to the method for connecting tensile members of the present invention.

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

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

FIG. 8 is a longitudinal sectional view showing a method of connecting tensile members according to a conventional example.

[Explanation of symbols]

 1 Tensile material, 2 Sleeve, 3 Screw part, 4 Coupling, 5 Screw part, 6 Concave part, 7, 9, 12, 14, 15 Metal stopper, 13 Protrusion, 13a, 14a Tapered surface, 16 Medium frame.

Claims (3)

(57) [Claims] 1. A method for connecting a tensile member in which ends of the tensile members are connected to each other via a coupler by abutting the ends of the tensile members, wherein the end portion of the tensile member has a threaded portion surrounding the end portion and an outer peripheral portion.
Is fixed by swaging the sleeve.
When caulking the sleeve, attach the metal stopper to the connection end of the sleeve.
In a state where it is recessed inside or protruded outside
Squeeze and secure, so that both pulls
At the end of the upholstery, a concave portion and a protruding portion for positioning the center are provided,
The center position of the tensile member is determined by the concave portion and the protrusion.
Beforehand, screw it into the sleeve at one end of the tensile material.
The coupler on both sleeves after the center position is set.
And connecting the tension members by screwing them together . 2. A tapered surface is formed at a fitting portion between the recess and the projection.
The method according to claim 1, wherein the tension member is provided. 3. The metal stopper is magnetic.
The method for connecting a tensile member according to claim 1 or 2, wherein