JPS6319391Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a reinforced cage used in reinforced concrete structures with cast-in-place piles.

(Prior art) In a reinforcing bar cage used for cast-in-place piles, both axial ends of a group of main reinforcements are attached to annular end plates placed at the top and bottom, and hoop reinforcements are arranged around the group of main reinforcements. Usually, the hoop bars are connected to the main bars, and the main bars of the baskets are connected to each other using a coupler and a nut.

In this case, if you assemble the rebar cage tightly,
If the threads of some of the many reinforcing bars become misaligned,
Since joining with a coupler becomes difficult, a technique is known in the past in which the main reinforcing bars are shifted up and down (Japanese Utility Model Publication No. 156121/1983).

(Problems to be Solved by the Invention) Although the above-mentioned prior art is effective to some extent, there is a problem in that the assembly frame formed by connecting the upper and lower end plates with the spacing member is buried together with the reinforcing bar cage.

In addition, since the hoop reinforcements (horizontal reinforcements) are attached to the spacing members, they do not significantly contribute to improving the rigidity of the main reinforcements, and even if they are attached to the main reinforcements, they are already installed before the reinforcement cage is erected (hanged). Since the main reinforcements are entirely routed around the main reinforcement group, there is a problem in that the degree of freedom of the main reinforcements is impaired when the main reinforcements are connected to each other.

(Problems to be Solved by the Invention) The present invention solves the problems of the prior art by preventing the axial movement and rotation around the axis of the main reinforcements from being impaired by the hoop reinforcements until the connection between the main reinforcements is completed. That's what I did.

(Means for solving the problem) In the present invention, both axial ends of the main reinforcement group are attached to annular end plates arranged at the upper and lower parts, and hoop reinforcements are arranged around the main reinforcement group. The following technical measures have been taken to create a reinforcing bar cage in which hoop bars are connected to main bars.

That is, in the present invention, both axial ends of each main reinforcing bar 4 are attached to the upper and lower end plates 2 and 3 so as to be movable in the axial direction and rotatable around the axis. The upper end plate 2 is provided with a nut 7 that can be fastened to and loosened from the upper and lower end plates 2 and 3.
Hoop reinforcements 5 bundled with a length that can be wrapped around the 4 groups of main reinforcements are attached to the hoop reinforcements 5, and a hanging portion 9 is provided for building the hoop reinforcements 5 in a bundled state.
is fixed on the inner circumferential surface of the upper end plate 2, protrudes upward, and is oriented radially inward.

(Example) In Fig. 1, 1 is a reinforcing bar cage, which includes upper and lower annular end plates 2 and 3, and 4 groups of screw-shaped main bars with both axial ends attached to the end plates 2 and 3. and hoop reinforcements 5 arranged around the 4 groups of main reinforcements and connected to the main reinforcements 4.

As shown in FIGS. 4 and 7, a plurality of main reinforcement insertion holes 6 are formed in the upper and lower end plates 2 and 3 at predetermined intervals in the circumferential direction on the same circumference, and each main reinforcement 4 is formed in the main reinforcement insertion holes 6. Both ends in the axial direction are attached to be movable in the axial direction and rotatable around the axis, and each main reinforcement 4 can be temporarily fixed to the upper and lower end plates 2 and 3 by nuts 7, and the upper and lower end plates 2 .

In addition, in the figure, the code 8 indicates the reinforcing plate for the reinforcing bar cage, and the seventh
In FIG. 8, numeral 9 indicates a hanging hook.

Therefore, in order to connect and assemble the upper reinforcing bar U to the lower reinforcing bar D, each main bar 4 of the lower reinforcing bar D
The upper reinforcing bar cage U is suspended by a crane or the like using the lifting part 9 so that each of the main bars 5 of the upper reinforcing bar basket U are located on the same axis, and the measures are taken as shown in Fig. 6 1 and 2. The main reinforcing bars 4 are connected by mechanical joints 12 such as threaded sleeves 10 and lock nuts 11.

That is, each main reinforcing bar group 4 of the upper reinforcing bar basket U is held by nuts 7 on the upper and lower end plates 2 and 3, and is movable in the axial direction and rotatable around the axis when the nuts 7 are loosened. Therefore, there is a certain degree of freedom and connection can be made using the mechanical joint 12.

Then, the hoop strips 5 tied to the rear end plate 2 with the mechanical joint 12 completed are untied, and the hoop strips 5 are lowered one by one to form a hoop with wires 13, etc., as shown in FIGS. 3 and 5. Connect the muscle 5 to the main reinforcement 4,
Next, the end plates 2, 3 and each main reinforcing bar 4 are securely fastened with nuts 7, and then the whole is lowered into the excavation hole, and after being lowered by a predetermined amount, the reinforcing bar cage is connected again in the same manner as described above.

In addition, when connecting the upper and lower reinforcing bar cages using the mechanical joints 12, the positions of the mechanical joints 12 may be on the same plane as shown in FIG. 61, or they may be staggered as shown in FIG. 62. can.

Furthermore, as shown in FIGS. 7 and 8, the upper and lower end plates 2 and 3 are formed of angle members in an annular shape. A hanging hook 9 inclined inwardly is fixed by welding, and here,
Interference with main reinforcing bars and the like during hoisting is avoided, and it is easy to engage and disengage hoisting hooks of construction cranes, etc.

(Effects of the invention) The invention is as described above, and since the main reinforcing bars are axially movable on the upper and lower end plates and rotatable around the axis,
While it is easy to connect the main bars of the upper and lower reinforcing bar cages, it has the following advantages.

Since the hoop reinforcements are bundled to the upper end plate and can be suspended in this state, the hoop reinforcements do not impede the axial movement and rotation of the main reinforcements when connecting the main reinforcements.

Moreover, since the hoop muscle is attached to the upper end plate, it is possible to connect the hoop muscle to the main muscle group while lowering the hoop muscle by its own weight.
In addition to being able to connect accurately, the hanging part fixed to the inner peripheral surface of the upper end plate protrudes upward and is oriented radially inward. Mutual interference between the main reinforcement and the main reinforcement group can be avoided, construction can be done accurately and easily, and hooks such as cranes can be engaged and disengaged easily and quickly.

Furthermore, after the reinforcing bar basket is suspended and erected, the main bars can be reliably fastened to the upper and lower end plates with nuts, and sufficient rigidity can be ensured.

Further, since the main reinforcing bars can be fastened to and loosened from the end plates using nuts, the upper end plate of the uppermost reinforcing bar basket can be reused by loosening the nuts and removing it.

Therefore, a high-quality reinforcing cage for cast-in-place concrete piles that is easy to manufacture and has excellent workability can be provided at a low cost.

[Brief explanation of the drawing]

Figure 1 is a front view of the embodiment of the present invention, Figures 2 and 3 are
The figure is each front view showing before and after construction (hanging).
The figure is a plan view of the end plate, Figure 5 is an explanatory diagram of the connection between the main reinforcement and the hoop reinforcement, Figure 6 1 and 2 are perspective views showing two examples of joints according to the embodiments of the present invention, and Figure 7 is a suspension Detailed plan view of the end plate that also serves as a fixture, Figure 8 is Figure 7C
-C is an enlarged sectional view. D...Lower reinforcing bar basket, U...Upper reinforcing bar basket, 2,3
...End plate, 4...Main reinforcement, 5...Hoop reinforcement.

Claims (1)

[Claim for Utility Model Registration] Both axial ends of the main reinforcement group are attached to the annular end plates arranged at the upper and lower parts, and hoop reinforcements are arranged around the main reinforcement group to connect the hoop reinforcements to the main reinforcement. In the reinforcing bar cage, both axial ends of each main reinforcing bar 4 are attached to the upper and lower end plates 2 and 3 so as to be movable in the axial direction and rotatable around the axis. It is provided with a nut 7 whose both ends are fastened to the upper and lower end plates 2 and 3 so as to be able to be loosened freely, and the hoop reinforcement 5 is bundled on the upper end plate 2 with a length that can go around the 4 main reinforcement groups. is attached, and a hanging part 9 for building the hoop reinforcement 5 in a bundled state is fixed to the inner circumferential surface of the upper end plate 2, protrudes upward, and is oriented in the radial inward direction. Reinforced cage featuring: