JPH0242407Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention is a method for fixing the main reinforcing bars for joints, for example, when arranging the main reinforcing bars for joints on a precast concrete plate (hereinafter referred to as PC board). This relates to a fixing jig.

[Conventional technology]

As is well known, when manufacturing PC boards, a formwork is constructed above the bed, reinforcing bars and other necessary parts are placed within the formwork, and then concrete is poured.

When the main reinforcing bars for joints are arranged so as to protrude from the outside of the PC board, the conventional method shown in FIG. 4 has been taken. That is, as shown in the figure, first the formwork 1 is assembled and installed on the bed 2,
Next, the main reinforcing bars 3 for joints and other necessary members are placed in the formwork 1.

Next, in order to make the part of the main reinforcing bar 3 for the joint that protrudes outward from the end surface of the PC plate a predetermined dimension α, a positioning steel 4 is arranged, and in order to ensure the height dimension β. A support member 16 having an insertion groove formed in the middle of the protruding portion of the main reinforcing bar 3 for the joint is arranged, and the main reinforcing bar 3 for the joint is fixed by tightening means such as bolts 17. In this state, concrete can be poured into the formwork 1 to form a PC board.

[Problem that the invention attempts to solve]

In the conventional method of arranging the main reinforcing bars 3 for joints on the PC board as described above, the dimensions α and β are
In order to ensure this, positioning mold steel 4 and supporting members such as plates, square timbers, iron plates, etc. must be fixed to bed 2 for each of the many main reinforcing bars 3 for joints, which is complicated. The work takes time, and on the other hand, when demolding the formwork 1, similarly complicated work is required, and it cannot be denied that the work efficiency is inferior.

Moreover, in order to determine whether or not the main reinforcing bars 3 for the joint are fixed to the bed 2, the worker checks whether the positioning steel bar 4 is fixed and the tightening conditions of bolts, etc. for each main reinforcing bar 3 for the joint. The problem was that it had to be done.

By the way, in order to fix the PC boards to each other, the main reinforcing bar 3 for the joint that protrudes outward from the end face of the PC board is inserted and fixed into the sleeve on the end face of the other PC board (not shown), so this main bar 3, that is, the above-mentioned dimension α, naturally requires necessary dimensional regulation, but it is difficult to reduce the error in the dimension with the above conventional means, and the formwork 1
The main reinforcing bars 3 for the joints were misaligned due to shocks and vibrations when pouring concrete inside the pipes, impairing workability and other problems.

This idea was made to solve this problem, and the main reinforcing bars for joints are shaped so that the part of the main reinforcing bars for joints that protrudes outward from the end surface of the PC board is placed in the optimal position. It is possible to perform the work of fixing to the frame or bed and the work of removing the formwork in a short time, and it is possible to clearly determine whether or not the main reinforcing bar for the joint is fixed to the formwork or bed. An object of the present invention is to provide a reinforcing bar fixing jig that can prevent displacement of main reinforcing bars for joints.

[Means for solving problems]

The reinforcing bar fixing jig according to this invention has a through hole bored in a support base, an abutting member for positioning the reinforcing bars by abutting the end face of the reinforcing bars, which extends and is supported by the support base, and a rotating member. is rotatably supported on the support base, and the rotary member has an axis whose axis coincides with the through hole in the raised position of the lever attached to the rotary member, but in the lowered position of the lever. An eccentric hole is provided so that the shaft center is eccentric.

[Effect]

In this device, the axis of the eccentric hole drilled in the rotating member coincides with the through hole drilled in the support base when the lever is in the raised position, but the axis is eccentric when the lever is in the lowered position. Therefore, the main reinforcing bar for the joint is firmly fixed to the formwork or bed.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 3 and 5 to 7.

1 is the formwork assembled and installed on the bed 2, 3
is a reinforcing bar placed in the formwork 1, and in this embodiment, the case of a main reinforcing bar for a joint will be explained. Reference numeral 5 denotes a support base, and as shown in FIG. 7, a through hole 6 centered on the axis _O2 is bored therein.
7 is r on the back of the support base 5 above the axis _O2 .
8 is an abutting member fixed to cover the protruding end surface of the hollow cylinder ₇ , and 9 is a support fixed inside the hollow cylinder 7 by means such as welding. A member with a through hole 6
A hole 10 whose axis O ₂ coincides with the hole 10 is bored (see FIG. 6). Reference numeral 11 denotes a rotating member that is rotatably fitted into the hollow cylinder 7 and has a coaxial center O ₁ with the hollow cylinder 7; 12 is a lever attached to the rotating member 11 in order to rotate the rotating member 11; 13 is lever 12
A notch 14 is provided in the hollow cylinder 7 over a range in which the lever rotates around _the axis _O1 , as shown in FIG. It is an eccentric hole having an axis O ₂ which is eccentrically drilled downward by r from the axis O 1 at the position, that is, aligned with the through hole ₆ , and therefore, when the lever 12 is in the raised position, the through hole The axes of the lever 6 and the eccentric hole 14 are both O ₂ and therefore coincide, but in the lowered position after the lever 12 is rotated approximately 90 degrees in the direction of the arrow (see FIGS. 5 and 7),
Since the axis O ₂ is eccentric from O ₁ by a distance r,
While the axis of the through hole 6 remains at _O2 , the axis of the eccentric hole 14 will move from _O2 to _O3 , and the eccentric hole 14 will sandwich the through hole 6. The positions of the lever 12 and the eccentric hole 14 after this rotation are indicated by dashed lines in FIGS. 5 and 7. Note that the axes of the through hole 6 and the eccentric hole 14 are
The position of the lever 12 when aligned at O ₂ is tilted at a small angle θ from the vertical position, and the lever 12 is tilted at a small angle θ from the vertical position.
2 keeps it from moving. 15 is hollow cylinder 7
This is a notch provided on the side of the abutting member 8, and serves to check whether the end of the joint main reinforcing bar 3 is in contact with the abutting member 8. In addition, the through hole 6, the eccentric hole 14, the hole 10
have the same shape and size, and are slightly larger than the outer diameter of the main reinforcing bar 3 for the joint.

Therefore, when the main reinforcing bars 3 for joints are fixedly arranged in the formwork 1 using the reinforcing bar fixing jig configured as described above, the reinforcing bars are placed in contact with the formwork 1 as shown in Fig. 3. In addition to installing the fixing jig, the lever 12 is held in an almost vertical position so that the eccentric hole 14 is aligned with the through holes 6 and 10 at the axis _O2 , and the main reinforcing bar 3 for the joint is inserted into the through hole 6. , the eccentric hole 14 and the hole 10, and are brought into contact with the abutment member 8. Next, when the lever 12 is rotated approximately 90 degrees clockwise in the direction of the arrow in FIGS. 5 and 7, the eccentric hole 1
4 gradually shifts from O ₂ to O ₃ , the outer peripheral surface of the joint main reinforcing bar 3 and the inner surfaces of the through hole 6, eccentric hole 14, and hole 10 are strongly pressed against each other,
The joint reinforcing bar main bar 3 will be firmly fixed. In addition, at this time, the worker should press the abutment member 8
It is necessary to check through the notch 15 whether or not there is contact between the main reinforcing bar 3 for the joint and the end face of the main reinforcing bar 3 for the joint.

In this state, concrete was poured into the formwork 1 and the main reinforcing bars 3 for the joint were buried.
PC board can be formed. Also, when demolding the formwork 1, move the lever 12 counterclockwise (the fifth
7), the main reinforcing bar 3 for the joint can be easily removed from the pressure contact with the inner surface of the through hole 6, the eccentric hole 14, and the hole 10.
It becomes possible to demold the reinforcing bar fixing jig.

Therefore, when this reinforcing bar fixing jig is used, the main reinforcing bar 3 for the joint can be firmly fixed.
Movement due to impact or the like can be prevented, and workability and functionality when demolding the formwork 1 are significantly improved. Furthermore, whether or not the main reinforcing bar 3 for the joint is fixed to the bed 2 or the formwork 1 can be instantly determined by looking at the position of the lever 12. In addition, the notch 15 on the abutment member 8 side allows checking whether or not the abutment member 8 is in contact with the end face of the main reinforcing bar 3 for the joint, so that the α of the outward protrusion from the end face of the PC board can be confirmed. This means that the dimensional errors in and β can be reduced.

In the above embodiment, the support stand 5 is fixed to the bed 2 using shaped steel, but it can also be directly attached to the formwork 1 using a plate material or the like.

Moreover, if the support member 9 is provided with a hole 10,
The outer surface shape does not have to be circular and may be integrated with the hollow cylinder 7.

Furthermore, in the above embodiment, the through hole 6 and the eccentric hole 14
Although the support member 9 is not used and the support member 9 is not used, the same effect can be achieved by using only the through hole 6 and the eccentric hole 14 as a cantilever type.

Further, in the above description, the fixing of the main reinforcing bars 3 for joints has been described, but it is obvious that the present invention can also be used to fix other linear bodies having shapes such as elliptical or polygonal shapes.

Furthermore, the rotation angle of the rotation member 11 is determined by the dimensions of the through hole 6, the eccentric hole 14, and the hole 10, as well as the dimensions of the main reinforcing bar 3 for the joint, so it is not limited to 90 degrees as in the embodiment. , a desired value can be selected according to the setting conditions.

The shape and dimensions of the eccentric hole 14 only need to be larger than the outer shape of the joint main reinforcing bar 3, and may be different from the through hole 6 and the hole 10.

[Effect of idea]

As explained above, this invention extends and supports an abutment member on a support base having a through hole,
Since the rotating member is rotatably supported on the support base and has an eccentric hole provided in the rotating member, simply rotating the rotating member allows Since the axis of the eccentric hole is eccentric, the main reinforcing bar for the joint can be firmly fixed to the bed or formwork.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of this invention, Fig. 2 is a plan view taken along the - line in Fig. 1, Fig. 3 is an assembly diagram showing an embodiment of this invention, and Fig. 4 is a conventional FIG. 5 is a cross-sectional view taken along the line - in FIG. 1, FIG. 6 is a cross-sectional view taken along the line - in FIG. 1, and FIG. 7 is a view taken along the line - in FIG. It is a diagram. 3...Reinforcing bar, 5...Support stand, 6...Through hole, 7
... Hollow cylinder, 8 ... Abutment member, 9 ... Supporting member, 10 ... Hole, 11 ... Rotating member, 12 ...
Lever, 14... Eccentric hole, 15... Notch. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims for Utility Model Registration] (1) A support base having a through hole bored therein, and an abutment member extending and supported by the support base and controlling the protruding length of the reinforcing bar inserted into the through hole; a rotating part rotatably supported by the support base, the rotating member has an axis that coincides with the through hole in the raised position of the lever attached to the rotating member; A reinforcing bar fixing jig, characterized in that it is provided with an eccentric hole whose axis is eccentric in the lowered position. (2) The abutment member is formed to extend onto the support base via a hollow cylinder fixed to the support base, and the rotating member is rotatably fitted into the hollow cylinder. A reinforcing bar fixing jig according to claim 1 of the utility model registration claim, characterized by: (3) The reinforcing bar fixing jig according to claim 2 of the utility model registration claim, characterized in that the hollow cylinder is provided with a notch at the abutting portion between the protruding end of the reinforcing bar and the abutting member. . (4) Reinforcing bar fixing according to claim 2 or 3 of the utility model registration claim, characterized in that a support member having a hole whose axis coincides with the through hole is fixed to the hollow cylinder. jig.