JPS62141337A - Grip force releasing device for grip coupler for pc steel - Google Patents

Abstract

PURPOSE:To accurately push back a male cone, by guiding an outer peripheral surface of a rim bar with a holder fixed to a grip coupler, and properly maintaining a press-fit condition of the rim bar. CONSTITUTION:A stop arm 12 has a hook portion 18, and the hook portion 18 is engaged with a grip coupler to retain a holder 11 at a fixed position. A rim bar 13 is formed at its outer circumference to be guided with a reverse stop projection 20 having a tapered surface 21. After a hook portion 19 is once pushed by the tapered surface 21 to a release position, it is engaged with a back surface of the projection 20 by a spring 14. Accordingly, a reaction to the reverse stop pawl is received by the holder, and a spring 5 is therefore compressed to accurately push back a male cone 4.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a grip that makes it possible to easily release the gripping force of a grip coupler for a PC steel material on a PC steel material while a pair of couplers remain connected. The present invention relates to a gripping force release device for a coupler.

[Conventional technology]

Grip couplers are used to connect prestressed steel materials. 1 in Figure 2 is it. This coupler is
A connecting screw 2 disposed in the center, a pair of female cones 3.3 facing each other on both sides of the female cone 3.3, male cones 4.4 press-fitted into each female cone, and a compression spring 5.4 exerting a pressing force on each male cone. 5 and spring holder 6
．． 6, and the male cone press-fitted into the female cone firmly grips the outer periphery of the PC steel material A.

However, in this structure, the male cone 4 is constantly receiving the force of the spring 5, so if it becomes necessary to release the gripping force and remove the PC steel material after connecting the PCq material as shown in the figure, the connection screw The female cone must be separated from its screw by loosening it, which is a cumbersome process.

Therefore, in such cases, a third
A gripping force release jig 7 as shown in the figure is generally used. This jig is set at the end of the grip coupler, as shown by the chain line in Figure 2, and pushed into the female cone, thereby retracting the male cone and releasing the PC steel material.

[Problem that the invention seeks to solve]

However, in this method, since the male cone 4 is constantly pressurized by the spring 5 in a direction that generates a gripping force, the PC steel material cannot be released unless a force is continuously applied to the rim bar to overcome the force of the spring. There are drawbacks.

In addition, the movement of the rim bar during press-fitting is guided by the PC steel material, but since there is no movement guide on the outside, the press-fitting posture is easy to change. The present invention has been made in view of the above, and an object of the present invention is to provide a gripping force release device for a grip coupler that allows a rim bar to be pushed in accurately and easily.

[Means for solving problems]

The gripping force release device of the present invention that achieves the above object has P
A holder that is attached to one end of a grip coupler that connects C steel materials and guides the movement of the rim bar through a guide hole that contacts the outer circumferential surface of the rim bar that is loosely fitted to the outer periphery of the PC steel material, and a holder that is attached to this holder and used as a grip coupler. a holder fixing means for removably locking the holder; a rim bar whose tip is press-fitted into the female cone of the coupler from one end of the grip coupler and pushes back the male cone that is tapered into the female cone against the biasing force of a spring; and the holder. and a means for holding the rim bar in a press-fitted state for supporting the rim bar and removably locking it to the rim bar.

In this device, the holder guides the outer circumferential surface of the limber and prevents the limber from changing its posture when moving, so the pressing force applied to the limber is transmitted straight to the male cone, allowing the male cone to be pushed uniformly around the entire circumference. .

Further, since the press-fitted state of the rim bar can be maintained by a holding means that is detachably attached to the rim bar and whose reaction force is received by the holder, there is no need to continue applying a pressing force to the rim bar.

〔Example〕

FIG. 1 shows an embodiment of the present invention. The illustrated gripping force release device 1o includes a holder 11, a locking arm 12 as a holder fixing means pivoted on the holder, and a limber 1.
3. It consists of a check pawl 15 pivoted on the holder and biased by a leaf spring 14 in the direction of locking onto the rim bar.

The holder 11 is a female cone 3 on one side of the grip coupler.
The guide hole 17 has a diameter slightly larger than the diameter of the guided portion of the rim bar 13 formed in the end wall.

Further, the locking arm 12 has a hook portion 18 that can be attached and detached from the other end of the grip coupler, and when this hook portion is locked to the grip coupler, the holder 11 is held in a fixed position.

Non-return claw 15 adopted as a means to maintain the press-fitted state of the rim bar
Also has a hook portion 19, and this hook portion is attached to the limber 1.
The tapered surface 2 of the check projection 20 provided on the outer periphery of the guided portion of No. 3
1 is once pushed in the disengagement direction, and then the projection 20 is engaged with the back surface of the protrusion 20 by the force of the spring 14. Since the reaction force acting on the non-return pawl is received by the holder held by the coupler, the spring 5 The rim bar 13 which has compressed and pushed back the male cone 4 as shown in the figure is held at the press-fitting position.

Needless to say, when the limber is press-fitted, the gripping force of the male cone 4 on the PC steel material is released, so that the PC steel material A can be freely removed from the grip coupler.

Note that the limb bar 13 used is one provided with a slit 22 through which a PC steel material can be inserted from the side.

A similar slit may be provided in the holder 11, but if the holder is divided into two parts in the circumferential direction and each divided member is removably connected, the holder can be attached to the PC steel material without the slit.

In addition, the fixing means for the holder is the locking arm shown in the figure, which allows the holder to be locked to the coupler with a so-called one-touch operation, but it may be replaced with a known fixing means other than the locking arm.

The leaf spring 14 also connects the hook portion 19 of the non-return pawl to the spring 5.
This can be omitted by locking the rim bar at a position where rotational moment due to the force is unlikely to occur, and by manually rotating the check pawl.

〔effect〕

As described above, the device of the present invention guides the outer circumferential surface of the rim bar press-fitted into the female cone by the holder fixed to the grip coupler by the stationary means, and maintains the correct press-fitting posture of the rim bar, so that no force loss occurs. The oscone can be pushed back accurately without any damage.

In addition, since the press-fitted state of the rim bar is maintained by a detachable holding means, the gripping force can be maintained in a released state until the removal or reinsertion of the PC steel material is completed without continuing to apply pressing force to the rim bar, making the work extremely easy. becomes easier.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view showing an example of the device of the present invention in use, FIG. 2 is a sectional view of the grip coupler,
FIG. 3 is a perspective view of a known limber. 10...Gripping force release device, 11...Holder, 12.
... Locking arm, 13... Rim bar, 14... Leaf spring, 15... Non-return claw, 16... Hole, 17... Guide hole, 18.19... Hook part, 20 ... Check projection, 21 ... Taber surface, 22 ... Slit.

Claims (1)

[Claims] A holder is attached to one end side of a grip coupler that connects prestressed steel materials, and guides the movement of the rim bar through a guide hole in contact with the outer circumferential surface of the rim bar, which is loosely fitted to the outer periphery of the prestressed steel materials. a holder fixing means for removably locking the holder; a rim bar whose tip is press-fitted from one end side of the grip coupler into the female cone of the coupler and pushes back the male cone taper-fitted to the female cone against the biasing force of a spring; and the holder. A gripping force release device for a grip coupler for a prestressed steel material, comprising means for holding a press-fitted state of a rim bar supported by the rim bar and removably locked to the rim bar.