JPS6224169B2 - - Google Patents

Description

[Detailed description of the invention] This invention crimps the main reinforcing bar from the inside of a pre-formed hoop iron material using a forming device,
The present invention relates to a method for forming a prefabricated reinforcing bar cage, which is characterized by welding the intersection of the main reinforcing bar and the hoop steel material.

Conventionally, prefabricated reinforcing bar cages are formed by rotating a main reinforcing bar group placed at a predetermined position, wrapping a hoop steel material around the main reinforcing bar group, and welding the intersection of the main reinforcing bar and the hoop steel material. In the conventional method, a group of reinforcing bars was fixed, a hoop was wrapped around the reinforcing bars, and the intersection points between the main reinforcing bars and the hoop were welded, which not only required large-scale forming equipment, but also Even when it is desired to wrap a large-diameter hoop reinforcing bar, there are various problems, such as being unable to do so due to limitations in the power of the device, and restrictions on hoop reinforcing materials.

However, in this invention, a hoop iron material is formed in advance, predetermined main reinforcing bars are arranged inside the hoop iron material, the main reinforcing bars are expanded toward the hoop iron material, and the intersection points of the main reinforcing bars and the hoop iron material are welded. This simplifies the forming apparatus, and since the hoop iron material is formed in advance, there is no restriction on the reinforcing bar diameter of the hoop iron material, thus solving the problems of the prior art. The prefabricated reinforcing bar cage according to the present invention is used for reinforced concrete structural columns or beam members, foundation piles cast on site, etc., but various conventional techniques can be applied to join it with other members. Hoop iron materials include circular or rectangular steel pipes cut into rings, steel strips formed into a predetermined shape, reinforcing bars welded into a net shape and processed, or hoop iron materials formed into a spiral shape. etc. are possible.

That is, to explain this invention with reference to an embodiment, supporting arms 4, 4 are slidably attached to a plurality of guide tubes 3, 3, respectively, which are provided radially around the outer periphery of a tube body 2 fitted on a shaft rod 1. The main reinforcing bars 5, 5 are temporarily attached to the tips of the supporting arms 4, 4, respectively, and a pre-formed hoop iron material 6 is placed on the outside of the main reinforcing bars (FIGS. 1 and 2), and then, By protruding the support arms 4, 4 attached to the guide tubes 3, 3 by an appropriate method (for example, hydraulically) (Fig. 3), the main reinforcing bars are expanded, and tension is applied to the hoop iron material 6.
When the hoop iron material 6 has a predetermined shape, the intersection points of the main reinforcing bar 5 and the hoop iron material 6 are welded to form a prefabricated reinforcing bar cage 7. In the above embodiment, a circular steel pipe cut to a predetermined length was used as the hoop iron material 6, but a square steel pipe cut so as to be square from the beginning may also be used.
Further, the hoop reinforcement may be made into a ring shape, or the hoop reinforcement or the steel strip may be formed into a spiral shape in advance to form the hoop iron material. Also, the guide tube 3,
It is also possible to make the attachment angles (mutual opening angles) of 3 adjustable so that the cross-sectional shape of the prefabricated reinforcing bar basket can be either square or rectangular.

Next, in the embodiment shown in FIGS. 5 and 6, a pin 9 is provided at the tip of the support arm 4, and the main reinforcing bars 5a,
Elongated holes 1 at both ends of attachment 8 that holds 5a
The attachment 8 is connected to the support arm 4 as shown in FIG. 5 by movably inserting the pin 9 through the steel hoop 6, and the hoop steel 6 is placed outside the main reinforcing bar group. Similarly, the support arms 4, 4 are made to protrude, the attachments 8, 8 and the main reinforcing bars 5a, 5a are expanded in mutually opposite directions, and the intersection points of the main reinforcing bars 5a and the hoop iron material are welded.

In the above example, when expanding the main reinforcement group,
Continue until the hoop iron material is deformed into the specified shape,
After that, welding work was performed, but the shape of the hoop iron material can also be defined by placing an outer circumference limiting frame device around the outer periphery of the hoop iron material. That is, as shown in FIG. 7, contact members 1 are placed at the four corners of the planned rectangular cross section so as to face the support arms 4, 4 that expand the main reinforcing bars 5, 5.
1 and 11 are arranged, and the support arms 4 and 4 are projected until the outer periphery of the hoop iron material 6 comes into contact with the contact members 11 and 11.

Note that a welding machine for welding the main reinforcing bar 5 and the hoop iron material 6 may be incorporated into the abutment members 11, 11.

Further, as shown in FIG. 8, the outer circumference of the hoop iron material can be limited by arranging a ring body 12 with a circular cross section around the outer circumference of the main reinforcing bar group. In this embodiment, a prefabricated reinforcing bar cage formed to have a circular cross section is shown, but it goes without saying that a square or rectangular shape can be similarly implemented.

When the outer periphery limiting frame device is used as in the embodiment shown in FIGS. 7 and 8 above, it is also possible to form a prefabricated reinforcing bar basket using hoop bars conventionally used for general reinforcing bar arrangement. That is, in the above embodiment, a loop-shaped or spiral-shaped hoop iron material was used, but even if the hoop iron material 6a is made by winding the hoop reinforcement 13 and overlapping both ends as shown in FIG. When expanding, the spread of the hoop iron material 6a can be limited by the outer periphery limiting frame device.

Next, in the embodiment shown in FIG. 10, a tube body 2 fitted on a shaft rod 1 is made slidable, and three stages of guide tubes 3, 3 are provided radially on the outer periphery of the tube body 2. tube 3,
A supporting arm 4 is slidably attached to each of the supporting arms 3. According to this embodiment, the main reinforcing bars 5 groups are not simultaneously spread over the entire length, but are partially spread, and the intersection points of the main reinforcing bars 5 and the hoop steel members 6b are welded at that part. After that, the temporary attachment of the support arm 4 and the main reinforcing bar 5 is released, the tube body 2 is moved in the direction of the solid line arrow 14 by the length of the tube body 2, and the main reinforcing bar 5 is anchored at the tip of the support arm 4 again at this point. After reaching the main reinforcing bar 5, expand the main reinforcing bar 5 and
The hoop iron material 6b is welded to the hoop iron material 6b, and this operation is repeated in order to form a prefabricated reinforcing bar cage, and the forming apparatus can also be simplified.

That is, according to the present invention, a main reinforcing bar group is arranged inside a pre-formed hoop iron material, and the main reinforcing bar group is expanded and the intersection points of the main reinforcing bar and the hoop iron material are welded to form a prefabricated reinforcing bar cage. As a result, it is possible to obtain a prefabricated reinforcing bar cage having a predetermined cross-sectional performance without being subject to the limitations of the hoop iron material, and the forming apparatus can be simplified. In addition, by pressing the main reinforcing bars from the inside of the hoop steel, the shape of the hoop steel can be formed into a predetermined shape, so the main reinforcing bars and hoop steel come into close contact, and together with welding, it becomes a strong reinforcing bar cage. There are various effects such as. Although not mentioned as an example, the hoop iron material may be constructed of welded mesh material or hoop lines diagonally intersecting.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an embodiment of the present invention before molding, Fig. 2 is a partially cutaway front view of the same, Fig. 3 is a cross-sectional view of the same when the molding is completed, and Fig. 4 is a cross-sectional view of the same when the molding is completed. Partial perspective view of prefabricated reinforcing bar basket, No. 5
The figure is a sectional view of another embodiment of this invention when forming is completed, FIG. 6 is a partial perspective view of a similarly formed prefabricated reinforcing cage, and FIG. 7 is another embodiment of this invention when forming is completed. A cross-sectional view, FIG. 8 is a cross-sectional view when molding is completed in yet another embodiment of the present invention,
Fig. 9 is a plan view of an embodiment of the hoop iron material used in this invention, and Fig. 10 is a partially cutaway view of an embodiment of the invention in which the main reinforcing bars can be partially expanded before forming. FIG. 1... shaft rod, 2... pipe body, 3... guide tube, 4...
...Support arm, 5, 5a...Main reinforcing bar, 6, 6a, 6b
... Hoop iron material, 7 ... Prefabricated reinforcing bar cage, 8 ...
Attachment, 9... Pin, 10... Long hole, 1
1... Contact member, 12... Annular body, 13... Hoop muscle, 14... Solid line arrow.

Claims (1)

[Scope of Claims] 1. After arranging pre-formed hoop iron materials and arranging the necessary number of main reinforcing bars at predetermined positions inside the hoop iron materials, the main reinforcing bars are directed from the inside of the hoop iron materials to the outside. Forming of a prefabricated reinforcing bar cage, characterized in that the inner wall of the hoop reinforcing material and the main reinforcing bar group are brought into contact with each other to determine the outer shape of the hoop reinforcing material, and the relevant contact portions are welded to form a reinforcing bar cage. Method. 2 The hoop iron material is formed by pre-winding reinforcing bars or steel strips into a spiral shape.
Method for forming prefabricated reinforcing bar cages as described in section. 3. The method for forming a prefabricated reinforcing bar cage according to claim 1, wherein the hoop iron material is formed by cutting a steel pipe with a circular or square cross section. 4. The method for forming a prefabricated reinforcing bar cage according to claim 1, wherein the outer shape of the hoop iron material is formed by moving the main reinforcing bar group to the outside and by an outer circumference limiting frame provided on the outside of the hoop iron material.