JPH085216Y2 - PC steel rod coupling coupler - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PC steel rod connecting coupler.

[0002]

2. Description of the Related Art Conventionally, a box culvert 51 of the upper and lower halves shown in FIG. 4 has a pair of upper and lower PC steel bars 5.
The upper and lower members 54 and 55 are assembled and bonded to each other by using 2, 53. That is, the unbonded PC steel rod 53 is embedded in the concrete of the lower member 55 in advance, the coupler 56 is attached to the upper end of the PC steel rod 53, and the upper member 54 is positioned and superposed on the upper surface of the lower member 55. Assemble into a box shape.
After that, the PC steel rod 5 is inserted into the sheath hole 57 of the upper member 54.
2 is inserted, the lower end of the PC steel rod 52 is fitted and fixed to the coupler 56, and the nut 5 is attached to the upper end of the PC steel rod 52.
I am trying to tighten 8.

[0003]

However, when the PC steel rod 52 is tensioned at the upper portion of the box culvert 51 described above, the lower end of the PC steel rod 52 inserted into the sheath hole 57 of the upper member 54 and the coupler 56. Since the fitting hole is not visible to the operator, the lower end of the PC steel rod 52 and the coupler 5
It is not easy to match the fitting hole of No. 6 with each other, the construction work on site becomes complicated, and the work efficiency cannot be improved.

The present invention has been made in view of such circumstances, and an object thereof is to provide a coupler for connecting PC steel rods capable of improving the efficiency of construction work on site.

[0005]

In order to solve the above-mentioned problems of the prior art, in the present invention, when a plurality of assembled members are joined and bonded to each other by a pair of PC steel rods, a pair of these members are joined together. In a PC steel rod connecting coupler having a tubular coupler body for fitting and fixing and connecting PC steel rods, a tapered surface portion serving as a guide portion of the PC steel rod is provided at an end portion of the coupler body, and A pin hole for inserting a rotation stop pin was provided in the outer peripheral wall of the coupler body so as to penetrate in a direction orthogonal to the axis, and a part of the coupler body was attached to one end of one PC steel rod and inserted into the pin hole. With the rotation stop pin blocking the rotation of the coupler body, one end of the other PC steel rod is mounted on the coupler body while moving along the tapered surface portion.

[0006]

[Operation] In the coupler for connecting PC steel rods according to the present invention,
A taper surface that serves as a guide for the PC steel rods is provided at the end of the coupler body that fits and connects a pair of PC steel rods, and a pin hole for inserting the locking pin is inserted through the outer peripheral wall of the coupler body. , One part of the PC steel rod is attached to one end of the coupler body, and the other end of the PC steel rod is moved along the tapered surface portion while the rotation of the coupler body is blocked by the rotation stop pin. However, since it is mounted on the coupler body, it is not necessary to align one end of the PC steel rod inserted inside the assembled member with the fitting hole of the coupler body, and the one end of the PC steel rod and the coupler body are fitted together. Even if the holes are not visible, good workability can be secured.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments.

1 to 3 show an embodiment of a PC steel rod connecting coupler according to the present invention. In the figure, 1 is a box culvert of a two-part upper and lower type (box-shaped underdrain), and this box culvert 1 uses a pair of upper and lower PC steel bars 2 and 3 to join and bond upper and lower members 4 and 5 to each other. It is built by assembling. For this reason, concrete products having a substantially U-shaped cross section are used for the upper and lower members 4 and 5, and the box culvert 1 having a rectangular space inside is assembled by vertically arranging the openings so as to face each other. It is like this.

A sheath hole 6 for inserting the PC steel rod 2 is formed on both sides of the upper member 4 over the entire length in the vertical direction. This sheath hole 6 is provided for the purpose of insulating the PC steel rod 2 and the concrete of the upper member 4 when introducing prestress. Further, on the upper and lower surfaces of the upper member 4, recesses (counterbore portions) 7 and 8 for accommodating a tightening nut (not shown) and a coupler described later are provided corresponding to the sheath holes 6, respectively.

On the other hand, unbonded PC steel rods 3 are buried in both sides of the lower member 5 along the vertical direction, and the unbonded PC steel rods 3 are embedded at the upper end near the upper surface of the lower member 5. It is supposed to be arranged. Further, on the upper surface of the lower member 5, a concave portion (counterbore portion) 9 for accommodating a coupler described later is provided corresponding to the unbonded PC steel rod 3. Thus, the upper end of the unbonded PC steel rod 3 is arranged in the recess 9 of the lower member 5 in an exposed state.

The PC steel rods 2 and 3 are formed in a size corresponding to the vertical lengths of the upper and lower members 4 and 5, and male and female portions 2a and 3a are provided at the upper and lower ends thereof, respectively.
It is adapted to be connected through a C steel rod connecting coupler 10. The coupler 10 includes a coupler body 11 formed in a tubular shape. Inside the coupler body 11, female thread portions 11a that are screwed into the male thread portions 2a and 3a of the PC steel rods 2 and 3 are provided. .

Further, the end of the coupler body 11 is formed into a dish shape by tapering as shown in FIGS. 1 and 2, and the taper surface portion 12 at the upper end of the female screw portion 11a extends from the outer periphery of the upper end surface 11b. Is inclined towards. That is, at the end of the coupler body 11, the tapered surface portion 12 is formed so that the upper end surface 11b side has a larger diameter than the female screw portion 11a side, and the tapered surface portion 12 is configured as a guide portion of the PC steel rod 2. Further, the outer peripheral wall of the coupler body 11 is provided with a pin hole 14 into which the detent pin 13 is inserted so as to penetrate in a direction orthogonal to the axis.

In order to construct the box culvert 1 using the PC steel rods 2 and 3 of this embodiment, first, the unbonded PC steel rod 3 is embedded in the concrete of the lower member 5 in advance at a predetermined height position. Then, a part of the coupler body 11 that constitutes the coupler 10 is screwed into the upper end of the unbonded PC steel rod 3 and the detent pin 13 is inserted into the pin hole 14 to prevent the coupler body 11 from rotating. Keep it.

Then, the lower surface of the upper member 4 is superposed on the upper surface of the lower member 5 so as not to be displaced, and assembled into a box shape. After that, when the PC steel rod 2 is inserted into the sheath hole 6 from above the upper member 4 as shown in FIG.
The lower end of the steel rod 2 hits the upper end surface 11b of the coupler body 11 and is guided to the female screw portion 11a of the coupler body 11 while moving downward along the tapered surface portion 12. In this state, when the PC steel rod 2 is rotated at right angles to the axial direction, the male screw portion 2a at the lower end is screwed into the female screw portion 11a of the coupler body 11, so that the lower end of the PC steel rod 2 is fitted to the coupler 10. Fixed. Then, when the upper end of the PC steel rod 2 is tightened by a tightening nut (not shown), the upper and lower members 4, 5 are joined and tightly connected to each other, and the assembling work of the box culvert 1 is completed.

When the coupler 10 of this embodiment is used, the female screw portion 11a of the coupler body 11 attached to the lower end of the PC steel rod 2 inserted into the sheath hole 6 by the operator and the unboarded PC steel rod 3 is attached to the upper member 4. Even if you cannot see it from above,
When the PC steel rod 2 is fed downward, the lower end thereof is guided by the tapered surface portion 12 and guided to the female screw portion 11a of the coupler body 11, so that the PC steel rod 2 can be easily moved to the coupler 10 by rotating it. And it will be fitted quickly.

The embodiment of the present invention has been described above.
The present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention. For connecting PC steel rods for fastening concrete products other than box culverts. It goes without saying that it can be applied.

[0017]

As described above, the PC steel rod connecting coupler according to the present invention is constructed such that when a plurality of assembled members are joined and fastened to each other by a pair of PC steel rods, the pair of P steel rods are connected together.
A tapered surface that serves as a guide for the PC steel rod is provided at the end of the tubular coupler body that fits and connects the C steel rods, and a pin hole is inserted into the outer peripheral wall of the coupler body to insert the rotation stop pin. One PC to penetrate through in the direction orthogonal to the center
While part of the coupler body is attached to one end of the steel rod, and the rotation of the coupler body is blocked by the detent pin inserted in the pin hole, while moving the other end of the PC steel rod along the tapered surface portion. Since it is attached to the coupler body, it is easy and quick to insert the PC steel rod into the coupler body even if one end of the PC steel rod inserted inside the assembled member and the inner diameter of the coupler body cannot be visually observed. It can be fitted, and even if the PC steel rod is rotated, the coupler body does not rotate due to the presence of the rotation stop pin, even when assembling a large member such as a box culvert The workability in construction is improved and the work efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing upper and lower members of a box culvert, which are joined and bonded together by using a coupler and a PC steel rod according to an embodiment of the present invention.

FIG. 2 is a sectional view showing the coupler.

FIG. 3 is a front view showing the coupler.

FIG. 4 is a cross-sectional view showing the upper and lower members of a box culvert that are joined and tightly bonded using a conventional coupler and a PC steel rod.

[Explanation of symbols]

 1 Box Culvert 2, 3 PC Steel Rod 2a, 3a Male Threaded Part 4 Upper Member 5 Lower Member 6 Sheath Hole 7, 8, 9 Recess 10 PC Steel Rod Connecting Coupler 11 Coupler Body 11a Female Threaded Part 12 Tapered Surface Part 13 Detent Pin 14 Pin hole

Claims (1)

[Scope of utility model registration request] 1. A pair of PCs having a plurality of assembled members.
In a PC steel rod connecting coupler having a tubular coupler body for fitting and fixing a pair of PC steel rods when joining and tightly connecting each other by steel rods, the PC is connected to an end portion of the coupler body. In addition to providing a tapered surface portion that serves as a guide portion for the steel rod, a pin hole for inserting a rotation stop pin is provided through the outer peripheral wall of the coupler body in a direction orthogonal to the axial center, and the coupler is provided at one end of one PC steel rod. Part of the body is attached, and while the rotation of the coupler body is blocked by the detent pin in the pin hole, one end of the other PC steel rod is attached to the coupler body while moving along the tapered surface. A coupler for connecting a PC steel rod, characterized in that