JPH042334B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for assembling a cylindrical reinforcing cage for concrete columns such as PC piles and RC piles.

[Prior art]

Conventionally, when assembling a reinforcing bar cage for PC piles, an automatic reinforcing bar cage assembling machine is used to place multiple axial steel members in predetermined positions, and then set the wire diameter on the outer periphery.
A method is used in which spiral reinforcing bars with a small diameter of 3.2 mm are successively welded at predetermined pitches.

[Problem that the invention seeks to solve]

In this case, there is a risk that the mechanical properties of the steel material may deteriorate at the welded location due to thermal history and weld defects. Furthermore, when using large-diameter reinforced concrete steel bars or irregularly shaped steel bars as the axial steel material, such as RC piles, it is difficult to weld with the above-mentioned automatic knitting machine, resulting in insufficient welding strength. For this reason, the mechanical strength of the reinforcing bar cage is ensured by manually inserting substantially circular assembly reinforcements at intervals of about 2 m and sufficiently welding the assembly reinforcements and the axial steel members. Furthermore, in order to improve the toughness and shear strength of the pile, we
When using helical reinforcing bars with larger diameters, it is extremely difficult to wind the helical reinforcing bars with conventional automatic knitting machines due to the high bending rigidity of the steel wire.
If the material is simply passed through an automatic knitting machine, the weldability of the intersection between the helical reinforcing bar and the axial steel material is poor, and even in this case, a step of attaching assembly bars is required to ensure the strength of the reinforcing bar cage. As mentioned above, welding all the intersections of the helical reinforcing bars and the axial steel members affects the mechanical properties of the reinforcing steel members, which is not desirable in terms of the performance of the pile.

[Means and actions for solving problems]

Therefore, the present invention was developed as a result of intensive efforts to eliminate the above-mentioned drawbacks, and proposes a method for easily assembling a reinforcing cage for a concrete column.

In the present invention, when assembling a cylindrical reinforcing bar cage made of spiral reinforcing bars, assembly bars, and axial steel members, a cantilevered upper horizontal member extending in a horizontal direction perpendicular to the axis of the reinforcing bar cage to be assembled; A helical reinforcing bar provided on the horizontal member to protrude in the axial direction of the reinforcing bar cage, a hook for holding the assembly reinforcement, a vertical member provided integrally with one end of the horizontal member, and a horizontal member of the vertical member. A plurality of frames are arranged in the axial direction of a reinforcing bar cage, each having a plurality of horizontal bars for holding steel members in the axial direction, which are installed in a cantilevered manner with a predetermined interval vertically on one side. First, a plurality of axial steel members were placed inside a spiral reinforcing bar that had the same inner diameter as the assembly reinforcing bars and was contracted in the axial direction of the reinforcing bar cage, and was suspended from the hook of the frame. and place it on the bar, then move some of the axial steel laterally and connect it to the predetermined position of the assembly bar that was removed from the hook, and then remove the helical reinforcing bar from the hook. By expanding the bars in the axial direction, fixing both ends to the assembly bars, connecting the remaining axial steel members to the assembly bars to manufacture a reinforcing bar cage, and pulling out this reinforcing bar cage in the axial direction of the bar. I tried to remove it from the stand.

〔Example〕

An embodiment of the method for assembling a reinforcing bar cage for a concrete column body according to the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show a method for inserting axial steel members 5 and 6 into the helical reinforcing bars 3 and assembly bars 4.

In this method, there is a cantilevered upper horizontal member extending in the horizontal direction perpendicular to the axis of the reinforcing bar cage to be assembled, and a helix provided on both sides or one side of this horizontal member to protrude in the axial direction of the reinforcing bar cage. Hooks 10 and 9 for holding the reinforcing bars 3 and assembly bars 4, a vertical member provided integrally with one end of the horizontal member, and a predetermined interval vertically on the side of the vertical member where the horizontal member is located. A plurality of frames 1 and 2 each having a plurality of horizontal axial steel members 5 and 6 and rods such as rollers 7 and 8 for holding are installed and cantilevered in the axial direction of the reinforcing bar cage. Devices arranged side by side were used. Among the plurality of frames 1 and 2, for example, the center frame 1 is the center frame, and the left and right frames have wheels, and the movable frames 2 are movable in the axial direction of the reinforcing bar cage.
And so. Note that as the rods for holding the plurality of horizontal axial steel members 5 and 6 attached to the vertical member in a cantilevered manner, rollers 7 and rods such as round steel are used.

The inner diameter of the assembly reinforcing bars 4 made by processing flat steel or steel bars into a substantially circular shape is equal to that of the spiral reinforcing bars 3, and the required number is manufactured in advance so that they can be arranged at intervals of about 2 m in the longitudinal direction of the reinforcing bar cage. The helical reinforcing bar 3 is
The required number of blocks are manufactured so that they can be arranged alternately with the assembly bars 4, and the spiral reinforcing bars 3 in one block are pre-wound with a predetermined number of turns so that the pitch and diameter will be as specified when the reinforcing bar cage is completed. , adjust the diameter. When assembling a rebar cage using a frame consisting of a fixed frame 1 and a movable frame 2, the hooks 9 of the fixed frame 1 and the movable frame 2,
The assembly reinforcing bars 4 and the helical reinforcing bars 3 contracted in the axial direction of the reinforcing bar cage are suspended from the reinforcing bars 10, respectively. At this time, if the fixed frame 1 and the movable frame 2 are brought close to each other in the axial direction of the reinforcing bar cage, insertion of the axial steel members 5 and 6 becomes easier. In this case, as described above, the mounts 1 and 2 have a height direction that is equal to the vertical spacing between the axial steel members 5 and 6 of the completed reinforcing bar cage, and a diameter larger than the diameter of the reinforcing bar cage. Since the rollers 7 and 8, which are a type of bar material with a length of 8 into the helical reinforcing bar 3 and assembly bar 4.

Next, as shown in FIGS. 3 and 4, the movable frame 2 is moved in the axial direction of the reinforcing bar cage so that the spacing between the assembly bars 4 becomes a predetermined distance. Next, the axial steel member 5, which is the top of the reinforcing bar cage, is shifted horizontally on the roller 7 in the axial direction of the roller, and is attached to a predetermined position of the assembly bar 4 removed from the hook 9 by welding, wire binding, or other means. After that, spiral reinforcing bar 3
is removed from the hook 10, expanded in the axial direction, and both ends are welded or tied to the assembly reinforcement 4. At this time, the helical reinforcing bars 3 should have a substantially appropriate pitch, but if any distortion occurs, it will be corrected.
Since the plurality of rollers 8 are adjusted in advance so that the axial steel members 6 are each at a predetermined height, the remaining axial steel members 6 are shifted horizontally in the roller axial direction on the rollers 8, and then assembled. Muscle 4
It is only necessary to join at the point where it intersects with the
A rebar cage as shown in the figure is completed.

By the above process, that is, by connecting the axial steel members 5 and 6 with the assembly reinforcement 4, the axial steel members 5 and 6 are pressed against the inside of the helical reinforcing bar 3, so that the pitch of the axial steel members 5 and 6 is caused by some external force. without any
There is no need to further bind the axial steel members 5 and 6 and the helical reinforcing bar 3 in the middle of the assembly bar 4. When the axial steel materials 5 and 6 have small diameters, the rigidity of the steel materials is low;
Since the force for pressing the inside of the helical reinforcing bar 3 is insufficient, the interval between the assembly reinforcing bars 4 may be reduced, or the axial steel members 5 and 6 and the helical reinforcing bar 3 may be bound to the minimum necessary extent.

At the end of these steps, the reinforcing bar cage can be easily taken out from the frame by pulling out the reinforcing bar cage from the cantilever-supported rollers 7 and 8 in the roller axial direction.

In the above embodiment, a fixed pedestal 1 is provided in the center, and movable pedestals 2 are provided on both left and right sides.
Although the example is shown in which the movable pedestal 2 is spread out after being inserted, the movable pedestal 2 may be spread out in advance at a predetermined distance from the fixed pedestal 1. If the length of the reinforcing bar cage remains unchanged, the movable frame 2 in this embodiment can be kept fixed. In this case, since the space between the frames 1 and 2 is wider than the space between the frames 1 and 2, it is only slightly more difficult to insert the axial steel members 5 and 6, and this does not particularly hinder the work. Further, depending on the case, it is also possible to make the central fixed pedestal 1 movable.

[Effects of the Invention] As described above, according to the present invention, by using a frame with rods such as rollers on which the axial steel material is placed, the axial steel material can be placed in the helical reinforcing bar manufactured in advance. It can be easily inserted and at the same time all the axial steel members can be precisely positioned at the predetermined height. Further, since there is almost no need to connect the helical reinforcing bars to the axial steel members, the manufacturing process of the reinforcing bar cage becomes simple and quick.

In addition, in the present invention, the helical reinforcing bar, which had been compressed and hung from the hook at the top of the frame, is removed from the hook and expanded in the axial direction, and both ends are fixed to the assembly bar by welding or binding. It is easy to attach the helical reinforcing bars to the reinforcing bars, and the pitch of the expanded helical reinforcing bars becomes almost constant naturally.

Furthermore, in the present invention, since the pedestal is provided with horizontal rods such as rollers for holding horizontal steel members in the axial direction in a cantilevered manner, the assembled reinforcing bar cage can be pulled out laterally as it is, and the pedestal can be attached to the pedestal. It can be easily taken out from the

As described above, according to the present invention, each work step can be performed reliably and easily, and as a result, the overall work can be performed reliably and easily, and the desired reinforcing bar cage can be manufactured efficiently. be able to.

[Brief explanation of drawings]

The drawings show one embodiment of an apparatus for carrying out the present invention, and FIG. 1 is a front view showing a state in which axial steel members are inserted into spiral reinforcing bars and assembly reinforcing bars, and FIG. Fig. 3 is a front view showing the connection between the axial steel member (top) and the assembly reinforcement, Fig. 4 is a left side view of Fig. 3, and Fig. 5 is a cross-sectional view according to the present invention. A front view of the manufactured reinforcing bar cage, FIG. 6, is a left side view of FIG. 5. 1... Fixed frame, 2... Movable frame, 3... Spiral reinforcing bar, 4... Assembly bar, 5... Axial steel material (top), 6... Axial steel material, 7... Roller (top) , 8... Roller, 9... Hook (assembly muscle),
10...Hook (helical reinforcing bar).

Claims (1)

[Claims] 1. In the assembly of a cylindrical reinforcing bar cage made of spiral reinforcing bars, assembly bars, and axial steel members, an upper horizontal member in a cantilevered manner extending in a horizontal direction perpendicular to the axis of the reinforcing bar cage to be assembled; , a hook for holding a helical reinforcing bar and assembly bar provided on the horizontal member so as to protrude in the axial direction of the reinforcing bar cage, and a vertical member provided integrally with one end of the horizontal member;
A plurality of frames having a plurality of horizontal bars for holding steel members in the axial direction, which are installed in a cantilevered manner with a predetermined interval vertically on the side where the horizontal member of the vertical member is located, are installed in a reinforcing steel cage. Using equipment arranged in the axial direction of the reinforcing bar cage, first, a plurality of assembly bars suspended from the hooks of the frame and a helical reinforcing bar having the same inner diameter as the assembly bars and contracted in the axial direction of the reinforcing bar cage were inserted. A plurality of axial steel members are inserted and placed on the bar, then some of the axial steel members are moved laterally and connected to predetermined positions of the assembly bars removed from the hooks, and then, The helical reinforcing bars are removed from the hooks, spread out in the axial direction, both ends of which are fixed to assembly bars, the remaining axial steel members are connected to the assembly bars to manufacture a reinforcing bar cage, and this reinforcing bar basket is attached to the bar axis. A method for assembling a reinforcing bar cage for a concrete column body, characterized in that the cage is taken out from the frame by being pulled out in the direction.