JPH061362Y2 - Reinforcing bar lifting tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a reinforcing bar for incorporating a reinforcing bar in a mold for injecting slurry in a manufacturing process of, for example, autoclave-cured lightweight cellular concrete (ALC). Regarding lifting equipment.

[Conventional technology]

In the manufacture of autoclave-cured lightweight cellular concrete, silica and quicklime are crushed into a slurry by adding water and aluminum powder, which is then poured into a mold and expanded by the foaming action of the aluminum powder to form a cake. The body is provided during the manufacturing process. In this case, before the slurry is poured into the mold, reinforcing bars are incorporated in advance to increase the strength of the lightweight cellular concrete.

By the way, this reinforcing bar is formed by arranging linear reinforcing bars in a grid pattern in the vertical and horizontal directions and welding the intersections to form a mat, or as shown in FIGS. 9 and 10, Two mat-shaped reinforcing bars 1a and 1b are joined at a predetermined interval by a pair of spacers 2a and 2b arranged at upper and lower positions.

The spacers 2a and 2b have a function of keeping the distance between the two reinforcing bars 1a and 1b constant, and also the reinforcing bars 1a and 1b.
It also has a role as a locked member when lifting 1b. That is, each spacer 2a, 2b has an insertion groove 3 having a neck portion.
a and 3b are provided, the lifting rod 4 is laterally fitted into the insertion grooves 3a and 3b, and the hook portion 5 formed at the lower end of the lifting rod 4 is inserted into the insertion groove 3b of the lower spacer 2b.
And the chamfered portion 6 formed by cutting a part of the shaft of the lifting rod 4 from both sides is fitted into the insertion groove 3a of the upper spacer 2a, and then the lifting rod 4 is rotated 90 degrees. Reinforcing bar 1 so that chamfer 6 does not come out of insertion groove 3a
It is possible to lift a and 1b.

Therefore, when incorporating the reinforcing bars 1a and 1b into the mold, a set frame 7 capable of simultaneously lifting a plurality of reinforcing bars 1 as shown in FIG. 11 is used.
After inserting the hoisting rod 4 into the insertion hole 8 opened in the above, and engaging the hoisting rod 4 with the upper and lower spacers 2a and 2b of each reinforcing bar 1 in the above-described manner, the set frame 7 is lifted to reinforce the reinforcing bar 1. Assemble it in the lifting form and inject the slurry as it is. Then, when the concrete molded body in the form has hardened to the extent that the lifting rod 4 can be pulled up, the lifting rod 4 is rotated 90 degrees again and moved laterally, and the insertion groove 3a and the surface of the upper spacer 2a are moved. The engaging bar 6 and the insertion groove 3b of the lower spacer 3b and the hook 5 are disengaged from each other, and the lifting bar 4 is pulled out upward, whereby the lifting bar 4 can be removed from the reinforcing bar 1.

[Problems to be solved by the device]

However, in the above-mentioned conventional reinforcing bar lifting device,
The engagement between the spacers 2a, 2b and the hoisting rod 4 is made by the hoisting rod 4
Since it is carried out by moving the lifting rod 4 in the lateral direction, there is a trouble that the lifting rod 4 must be set at a position corresponding to the insertion grooves 3a, 3b of the spacers 2a, 2b when the lifting rod 4 is set. When the 4 is pulled out from the spacers 2a and 2b, the concrete molded body is hardened to some extent, so that the lifting rod 4 cannot be easily removed from the insertion grooves 3a and 3b.

Therefore, the technical problem of the present invention is that the lifting rod can be easily set and pulled out from the spacer.

[Means for Solving the Problems]

In order to solve the above technical problem, the present invention installs a pair of spacers for holding a pair of reinforcing bars at a predetermined interval at the upper and lower positions of the reinforcing bars, and inserts a lifting rod into these spacers. At the same time, in the reinforcing bar lifting tool for lifting the reinforcing bar by locking the tip of the lifting bar to the lower spacer, the upper spacer is provided with an insertion hole, and the lower spacer is provided with an insertion hole and the peripheral portion thereof. While each locking claw is provided, the tip of the lifting rod elastically engages with the locking claw when it is inserted into the lower spacer, and the locking claw is released when the lifting rod is rotated by a predetermined angle. The means is a reinforcing bar lifting tool provided with a locking portion.

[Action]

According to the above means, when setting the lifting rod to the spacer, it is possible to lift the reinforcing bar by engaging the locking claw of the spacer simply by inserting the lifting rod from above into the insertion hole provided in the spacer. Further, when the lifting rod is pulled out from the spacer, the engagement with the locking claw is released only by rotating the lifting rod by a predetermined angle, and then the lifting rod can be pulled out from the spacer as it is.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing an embodiment of a reinforcing bar lifting device according to the present invention. In this figure, as in the conventional example, the reinforcing bar hoisting tool basically has a pair of spacers 10a. 10b and a lifting rod 11 that engages with the spacers 10a and 10b.

The spacers 10a and 10b are arranged at the upper position and the lower position of the reinforcing bars 1a and 1b, respectively. As shown in FIGS. 1 and 2, the upper spacers 10a are arranged on the left and right reinforcing bars 1a and 1b. The holding portions 12a, 12b on both sides which are fitted into the horizontal reinforcing bars from below, and the holding portions 12a,
And a flat surface portion 13 that connects between the flat portions 12b.
An insertion hole 14 into which the lifting rod 11 is loosely fitted is formed in the center of 3. As shown in FIGS. 1 and 3, the lower spacer 10b has a flat surface portion 16 between the holding portions 15a and 15b on both sides, and the flat surface portion 16 has a diameter larger than that of the insertion hole 14 at the center thereof. The small insertion hole 17 of the
A pair of downward engaging claws 18, 18 protruding in a direction orthogonal to a line connecting the left and right holding portions 15a, 15b are formed on the peripheral edge portion of 7 so as to face each other. In addition, this locking claw 1
8 is provided with two parallel cuts at the peripheral edge of the insertion hole 17,
It is formed by cutting and raising the space between these cuts to the lower side. Reinforcing flanges 25 and 26 are formed at the front and rear ends of the flat portions 13 and 16, respectively.

On the other hand, as shown in FIG. 1 and FIG. 5, the hoisting rod 11 has a thickness such that its shaft portion is loosely fitted in the insertion hole 14 of the upper spacer 10a, and the lower spacer 1
A locking portion 19 that engages with 0b is formed. The tip portion is narrower than the general shaft portion from the step portion 20, and a taper 21 is attached from the middle of the thin shaft to form a conical shape. The engaging portion 19 has a flat surface portion 22 formed by scraping off a part of both surfaces facing each other between the base portion of the taper 21 and the step portion 20, and the flat surface portion 22 and the taper 2.
1 and a locking step portion 23 formed between the base portion and the base portion. The width of the locking step 23 is substantially the same as the lateral width of the locking claw 18.

Next, a method of hoisting the reinforcing bar using the reinforcing bar lifting tool having the above-described configuration will be described.

First, as shown in FIG. 1, the spacers 10a and 10b are fitted into the reinforcing bars so that the central axes 24 of the spacers 10a and 10b coincide with each other in the vertical direction, and the overlapping portions are locked or fixed. Next, the upper spacer 1
The hoisting rod 11 is inserted into the insertion hole 14 of 0a from the front end portion, and is straightly lowered to fit the front end portion into the insertion hole 17 of the lower spacer 10b. At this time, as shown in FIG. 1, the engaging portion 19 is attached to the engaging claw 18 of the lower spacer 10b.
The hoisting rods 11 are oriented so that the flat portions 22 of them correspond. When the insertion hole 17 of the lower spacer 10b is fitted into the tip portion, the taper 21 receives resistance by the locking claw 18, but when the lifting rod 11 is pushed down as it is, the locking claw 18 is expanded by the elastic action. Then, if the locking claws 18 are further pushed down, the locking claws 18 fall into the locking stepped portions 23 and at the same time elastically return, and the tip ends of the locking claws 18 engage with the locking stepped portions 23. This state is shown in FIGS. 4 to 7.

Therefore, when the lifting rod 11 is lifted in this state, the reinforcing bars 1a and 1b are engaged by the engagement of the engaging portion 19 and the engaging claw 18.
Can be lifted. Therefore, it is possible to move to the place where the formwork is located and install it in the formwork. The hoisting rod 11 can also set a plurality of reinforcing bars at the same time by using a setting frame as in the conventional case.

On the other hand, when removing the set of the lifting rod 11, first,
As shown in the figure, rotate the lifting rod 90 degrees and
By disengaging 8 from the locking stepped portion 23 of the locking portion 19 and bringing it into contact with the peripheral surface of the shaft portion, the engagement between the both can be released.
Therefore, when the slurry is poured into the formwork and the concrete compact is hardened to some extent, the lifting rod is set to 9% as described above.
If it is pulled up as it is after being rotated by 0 degree, the tip of the locking portion 18 can be easily pulled out by causing a slight resistance to the peripheral surface of the taper 21, and is hardly affected by the hardening of the concrete molded body. .

The shapes of the locking claw 18 and the locking portion 19 are not limited to those in the above-described embodiment. Further, the rotation angle for releasing the locking claw 18 and the locking portion 19 is not limited to 90 degrees.

〔effect〕

As described above, according to the reinforcing bar hoisting tool of the present invention, when setting the hoisting rod, it is only necessary to insert it into the insertion hole of the spacer, and when pulling it out, turn it by a predetermined angle and pull it up. Since it is only necessary to perform the series of operations, it is possible to prevent the lifting rod from being pulled out due to hardening of concrete.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a reinforcing bar lifting device according to the present invention, FIG. 2 is a perspective view of an upper spacer, FIG. 3 is a perspective view of a lower spacer, and FIG. 4 is a lifting rod as a spacer. FIG. 5 is a perspective view when they are engaged with each other, FIG. 5 is a perspective view of the engagement portion viewed from below the spacer, FIG. 6 is a sectional view taken along line VI-VI in FIG. 5, and FIG. 7 is FIG. Middle VII-VII line sectional view, FIG. 8 is a sectional view of the engaging portion when the lifting rod is rotated 90 degrees, FIG. 9 is a perspective view of a conventional reinforcing bar lifting device, and FIG. 10 is a lifting rod. FIG. 11 is a perspective view when engaged with a spacer, and FIG. 11 is a perspective view when a set frame is used. 1a, 1b ... Reinforcing bar 10a, 10b ... Spacer 14, 17 ... Insertion hole 18 ... Locking claw 19 ... Locking part

Claims (1)

[Scope of utility model registration request] 1. A pair of spacers for holding a space between a pair of reinforcing bars at a predetermined interval are respectively installed at upper and lower positions of the reinforcing bars, and lifting rods are inserted into these spacers, and tips of the lifting rods are mounted on a lower spacer. In a reinforcing bar lifting tool for locking a portion to lift a reinforcing bar, the upper spacer is provided with an insertion hole, and the lower spacer is provided with an insertion hole and a locking claw projecting at a peripheral edge thereof. The tip of the lifting rod is provided with a locking portion that elastically engages with the locking claw when the lifting rod is inserted into the lower spacer and that releases the locking claw when the lifting rod is rotated by a predetermined angle. Characteristic reinforcement lifting device.