JPH0754471Y2 - Jig for rebar alignment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is a jig used for aligning rebars to be added in the construction of super-large reinforced concrete structures such as high-rise buildings and bridge piers found in the main four bridges. It is about.

[Conventional technology]

When constructing pillars or piers of buildings made of reinforced concrete structure, the upper end of the rising rebar that is usually set on the foundation side is added to the upper rebar one by one to perform on-site assembly of the rebar, and then the A method was adopted in which a formwork was built around and concrete was placed to build it.

However, when the reinforced concrete structure to be constructed is large, such as a pillar of a skyscraper, or an ultra-large structure such as a bridge pier with four bridges, the number of reinforcing bars used is large and the large diameter reinforcing bars are used. Therefore, the method of replenishing each rebar one by one as described above is inefficient. Therefore, instead of this method, a so-called rebar pre-assembly method has been adopted, in which a plurality of rebars to be added in advance are assembled in advance and the pre-assembled rebar groups are suspended by a crane or the like and erected at a predetermined position. ing.

[Problems to be solved by the device]

As described above, this reinforcing bar tip assembly method can construct a plurality of reinforcing bars at the same time, and thus can greatly contribute to the efficiency improvement of the reinforcing bar assembly work.

However, after suspending the pre-assembled reinforcing bar group at a predetermined position, when joining the reinforcing bars to the standing reinforcing bars on the foundation side, that is, the individual reinforcing bars of the existing reinforcing bar group, the reinforcing bars to be joined first Although the cores must be aligned with each other, there is the following problem because there is no appropriate jig for the alignment work.

By the way, when the previously assembled rebar group is hung at a predetermined position with a crane etc., the operator first guides it onto the existing rebar while slowly hanging it by holding the lower part of the rebar group by hand. Was performed, and in parallel with that, a fixing jig was attached between both sides to fix them. That is, it relied on manual alignment work.

Therefore, the alignment is delicate, especially in the case of a super-large reinforced concrete structure where large diameter reinforcing bars are used, the weight is heavy and there are cases where it shakes, so it takes time to work.
In addition, there was a problem that the work involved danger.

Therefore, the characteristics of the bending angle of the rebar tip assembly method were diminished, and appropriate measures were required for the centering work.

In order to meet such demands, the present invention automatically realigns the reinforcing bars to be replenished simply by slowly suspending them even if there is a slight shake in the suspended group of reinforcing bars. The present invention was devised for the purpose of providing a centering jig having a so-called rebar reinforcing guide function.

[Means for Solving the Problems]

As a means for achieving the above object, a centering jig for reinforcing bars is configured as follows.

A rod-shaped support, upper and lower reinforcing bar holding metal fittings and upper and lower reinforcing bar holding metal fittings provided on the upper and lower sides of the rod-shaped support, and an upper funnel shape that can open and close in half in the vertical direction to guide the lower end of the reinforcing bars to be replenished. In a centering jig for rebars, which comprises a rebar guide fitting, first, the rod-shaped support body is formed in a shaft shape of a screw jack. Then, an adjusting nut for adjusting the level of the lower reinforcing bar gripping tool and the upper funnel-shaped reinforcing bar guiding tool was provided at the upper end thereof. In addition, hinges for opening and closing the funnel of the upper funnel-shaped reinforcing bar guide were provided near the outer halves of both halves. Then, below the funnel-shaped reinforcing bar guide, there was provided an upper reinforcing bar grasping bracket consisting of a bracket for locking rebar to be replenished and moving integrally with the bracket and a fastening bolt. Further, a spacer made of a plate-like piece is provided between the lower reinforcing bar gripping tool and the upper reinforcing bar gripping tool to secure the root gap of the butt joint. That is, the structure is such that the centering and the adjustment of the root gap can be performed at the same time.

[Action]

Since the reinforcing bar centering jig according to the present invention is configured as described above, the jig body is clamped near the upper end of the existing reinforcing bar by using the reinforcing bar gripping metal fitting of the jig.

In this state, the reinforcing bars to be replenished are hung from above, and the lower end is slowly dropped into the funnel-shaped reinforcing bar guide fitting in the jig body.

Then, the axis of the funnel-shaped reinforcing bar guide metal and the axis of the reinforcing bar gripping metal clamped to the upper end of the existing reinforcing bar are regulated to the same vertical line, so that the axial core of the reinforcing bar to be suspended is In the process of passing through the funnel portion of the funnel-shaped reinforcing bar guide, it is guided to the axis side of the existing reinforcing bar and automatically aligned, and at the same time, the root gap of the butt joint is secured.

〔Example〕

Further, the configuration of the centering jig according to the present invention will be specifically described with reference to the drawings.

FIG. 1 shows the centering jig main body A according to the present invention and the existing reinforcing bar B.
Partial vertical cross-sectional side view shown attached to the upper end of
B'indicates a reinforcing bar to be added.

As described above, the centering jig main body A includes the rod-shaped support 1, the reinforcing bar gripping metal 2 that can be detachably fastened near the upper end of the existing reinforcing bar B, and the lower end of the reinforcing bar B'to be replenished. It is configured with a funnel-shaped reinforcing bar guide fitting 3 for guiding.

In the embodiment, the rod-shaped support 1 is constructed like a shaft of a screw jack, and the funnel-shaped reinforcing bar for the reinforcing bar gripping metal fitting 2 is operated by operating the adjusting nut 1a shown in FIG. The level of the guide fitting 3 can be adjusted vertically. This is due to the discrepancy of the reinforcing bar B'to be added to the existing reinforcing bar B,
If there is a vertical positional deviation, it is for adjusting the discrepancy and deviation before welding.

Next, the reinforcing bar gripping metal fitting 2 which is detachably fastened near the upper end of the existing reinforcing bar B has a bifurcated reinforcing bar holding section 2a.
As shown in the figure, after the upper end portion of the existing reinforcing bar B is inserted through the reinforcing bar holding section 2a, the clamp bolt 2b provided on the side surface of the reinforcing bar holding section can be tightened for fixing.

The funnel-shaped reinforcing bar guide metal fitting 3 for guiding the lower end of the reinforcing bar B ′ to be rejoined is composed of a funnel part 3a and a lower cylindrical part 3b as shown in the side view of FIG. 2 and the plan view of FIG. The structure is halved in the axial direction, that is, in the vertical direction, and both of them are connected by a hinge type so that they can be opened and closed in the vertical direction.

More specifically explaining this point, as shown in FIG. 2, ribs 3 are formed on the outer peripheral wall surfaces of the funnel portion 3a and the lower cylindrical portion 3b.
c, 3c is attached, and the outer vertical edges 3c ', 3c' of these ribs 3c, 3c
The ring-shaped ear pieces 3d, 3d, 3d ', 3d' which interleave with each other are provided on the ring-shaped ear pieces 3d, 3d, 3d ', 3d', and connecting pins 3e, 3e are inserted into the ring-shaped ear pieces 3d, 3d, 3d ', 3d' to connect them.

As a result, the funnel-shaped guide fitting 3 can be opened and closed by using the connecting pin 3e shown on the left side as a spindle when the connecting pin 3e shown on the right side in FIGS. 2 and 3 is pulled out.

The funnel-shaped guide fitting 3 is provided with such an opening / closing function only after the centering of the reinforcing bars B and B ′ and the welding work are completed.
This is because it is necessary to remove the jig body A from the reinforcing bars B and B '.

Further, the lower cylindrical portion 3b of the funnel-shaped reinforcing bar guide fitting 3 shown in FIG.
The fastening bolts 4 provided on the are for locking the reinforcing bars B ′ to be added to the funnel-shaped reinforcing bar guide fitting 3 side.

Next, as a means for attaching the reinforcing bar gripping metal 2 and the funnel-shaped reinforcing bar guiding metal 3 to the upper and lower sides of the rod-shaped support 1, as shown in FIG. 1b is provided, and is integrally fixed to the tips of the horizontal support pieces 1b, 1b by using welding means.

However, in the embodiment, since only the funnel-shaped reinforcing bar guide fitting 3 is required to be aligned with the reinforcing bar gripping fitting 2 and the like, a bracket is formed on the lower part of the one-sided funnel portion 3a divided in half as shown in FIG. Provided with mounting ear pieces 3f, 3f, and using these ear pieces 3f, 3f, the mounting bolts 3g and 3g are attached to the end portions of the horizontal support pieces 1b, 1b as shown in FIG. ing.

Further, in the embodiment, as shown in FIG. 1, a plate-like piece serving as a spacer 5 is made to project from the rod-shaped support 1 side in the middle of the reinforcing bar gripping metal 2 and the funnel-shaped reinforcing bar guiding metal 3, and the existing reinforcing bar B is used. Is interposed between the upper end of the butt joint and the lower end of the reinforcing bar B'to be replenished so that the root gap of the butt joint can be secured at the same time as the centering work.

Since the present invention is constructed as described above through the embodiments, the jig body A is first used in using it.
Is clamped near the upper end of the existing reinforcing bar B using the reinforcing bar gripping metal 2.

Then, the reinforcing bar B ′ to be replenished is suspended, and the lower end thereof is slowly suspended in a manner of dropping it into the funnel portion 3a of the funnel-shaped reinforcing bar guide fitting 3. Then, the axis of the funnel-shaped reinforcing bar guide fitting 3 is aligned with the axis of the reinforcing bar gripping fitting 2 located therebelow, so that it is automatically aligned with the axis of the existing reinforcing bar B in the process of being slowly suspended. Upon receiving the action, the so-called centering is performed.

When the centering work is completed, the funnel-shaped reinforcing bar guide fitting 3
By tightening the fastening bolt 4 provided on the above, the funnel-shaped reinforcing bar guide fitting 3 itself is fixed to the side of the reinforcing bar B'to be added.
Then, the spacer 5 provided to secure the root gap is removed, and the abutting portion is welded.

When the welding work is completed, the funnel-shaped reinforcing bar guide fitting is opened, and the jig body A is removed from the reinforcing bars B and B '.

FIG. 4 is a perspective view showing a usage procedure when a jig is used for centering according to the present invention in a concrete rebar first assembly method.

As shown in this figure, the jig main body A is attached to the reinforcing bars B located at the four corners of the existing reinforcing bars B ... Group rising from the foundation side in the same manner as described above.

And the pre-assembled rebar, that is, the rebar B '...
Suspend the group with a crane or the like, and the suspended reinforcing bar B '...
The lower ends of the reinforcing bars B ′ located at the four corners of the group are slowly dropped into the funnel-shaped reinforcing bar guide fitting 3 of the jig body A attached to the existing reinforcing bar B side.

Then, the existing rebars B at the four corners and the rebars B'at the four corners of the suspended pre-assembled rebars B '... group are first automatically centered. The joints at the four corners are welded in the same manner as described above, and the remaining existing reinforcing bars B and the reinforcing bars B'on the side of the pre-assembled reinforcing bar group are then welded in order.

[Effect of device]

As described above, the centering jig for reinforcing bars according to the present invention automatically performs centering of the reinforcing bars to be joined, and thus can exert the following effects.

(1) It is possible to align the reinforcing bars by simply hanging the pre-assembled reinforcing bars with a crane and slowly lowering them. Therefore,
Compared with the conventional manual centering work, the reinforcing bar installation work itself is dramatically made more efficient.

(2) Even if there is a slight sway in the reinforcing bar group when it is hung by a crane, the funnel part of the funnel reinforcing bar guide guides the lower end of the reinforcing bar to be added, so there is no need to wait for the sway to stop. . That is, the centering work proceeds in parallel with the suspension of the reinforcing bars to be added. Therefore, as compared with the conventional centering work, the centering can be performed in an extremely short time.

(3) Since the work area by manpower is eliminated in the construction work of the reinforcing bar at the site, highly safe and efficient construction is secured.

(4) If a spacer for securing the root gap is provided between the reinforcing bar gripping tool and the funnel-shaped reinforcing bar guiding tool in the jig, the installation work including centering of the reinforcing bar and adjustment of the root gap can be performed. The welding work of the joint portion, which is the next process, can be continuously performed by proceeding in the form of simultaneous progress. As a result, it can greatly contribute to the efficiency improvement of the construction work of the large reinforced concrete product itself.

[Brief description of drawings]

The drawings show an embodiment of a centering jig for reinforcing bars according to the present invention. FIG. 1 is a side view showing a part of the jig in a longitudinal section.
Fig. 2 is a side view of the funnel rebar guide fitting for guiding the lower end of the rebar to be replenished, Fig. 3 is its plan view, and Fig. 4 is a case of adding the pre-assembled rebar group to the existing rebar group. It is a perspective view which shows the use condition using a tool. A ... Jig body, B ... Existing rebar B '... Reinforcing bar to be added 1 ... Rod support, 1a ... Adjusting nut 1b ... Horizontal support piece, 2 ... Reinforcing bar gripping metal 2a. -Shaped rebar holding part 2b ...... Clamp bolt 3 ...... Funnel-shaped rebar guide metal fitting 3a ...... Funnel part, 3b ...... Lower cylindrical part 3c ...... Rib 3c '…… Outer vertical edge of rib 3d …… Annular ear piece, 3e …… Connecting pin 3f …… Ear piece, 3g …… Mounting bolt 4 …… Tightening bolt, 5 …… Spacer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-56-105064 (JP, A) Actual Kaihei 2-11952 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A rod-shaped support, and upper and lower reinforcing bar holding metal fittings provided above and below the lateral side of the rod-shaped support, respectively.
A centering jig for rebars, which comprises an upper funnel-shaped rebar guide fitting that can be opened and closed in half with respect to the vertical direction to guide the lower end of the rebars to be replenished, the rod-shaped support being a shaft of a screw jack. The upper part of the upper part is provided with an adjusting nut that adjusts the level of the lower reinforcing bar gripping part and the upper funnel-shaped reinforcing bar guiding part, and the hinge part that opens and closes the funnel of the upper funnel-shaped reinforcing bar guiding part is divided in half. The upper part of the funnel-shaped reinforcing bar guide metal fitting is provided at the lower part of the funnel-shaped reinforcing bar guide metal fitting, which is composed of a bracket that locks the reinforcing bars that move integrally with the metal fitting and a fastening bolt. A spacer made of a plate-like piece for securing the root gap of the butt joint is provided between the upper rebar holding metal fitting and A jig for aligning rebars, which is characterized in that it can be adjusted at the same time.