JPH0556210B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method for organizing tapered reinforcing bar cages used in prestressed concrete poles.

``Prior art and problems to be solved by the invention'' Conventional reinforcing bar cages for prestressed concrete poles are made by winding spiral bars around the outer circumference of non-tension bars arranged in a ring using a reinforcing bar braiding machine. A non-tensioned reinforcement cage braided by welding or the like at the intersection of
When combining a non-tensioning reinforcement cage with a prestressed steel material, multiple tensioning PCs are installed inside the non-tensioning reinforcement cage with rivets at the rear end and passed through the base plate. Insert the steel material into this
After passing the tip of the prestressing steel material through the end plate and riveting it, we use a method of binding the prestressing steel material to the spiral bar with a binding wire at an arbitrary position so that the placement position corresponds to the designed position to some extent.

However, in the above conventional method, since the intersection of the prestressing steel material and the spiral bar is tied together, the bundling portion becomes unstable and the wire rods shift in position.If the prestressing steel material is tensed in that state, it will not match the designed position. In order to prevent the positional deviation of the prestressing steel materials, as shown in Fig. 4, the prestressing steel materials 5' of the prestressing steel materials 5 and 5' should be aligned with the designed placement position, and the adjacent It is necessary to perform the work of tying the left and right non-tension muscles 1, 1 in a double loop shape with a binding wire at multiple locations, and this work is extremely complicated and time-consuming, and the work efficiency is also extremely low.

"Means for Solving the Problems" In order to solve the above-mentioned conventional problems, the present invention has the following features:
When braiding the non-tension muscle basket 3 by winding the spiral muscle 2 around the non-tension muscle 1 arranged in an annular shape, one auxiliary longitudinal reinforcement 4 for positioning is placed at a predetermined arbitrary position. It is fixed to the spiral reinforcement 2 along the arrangement position of the standard PC steel material 5', and a rivet is machined at the rear end in this non-tension reinforcement cage 3, and a through hole is arranged at the designed position of the base plate 6. After inserting the plurality of prestressed steel materials 5, 5' through which they have passed, and riveting them by passing their tips through the through holes placed at the designed positions of the end plate 7, the reference prestressing steel materials 5' are attached to the auxiliary vertical bars. This paper proposes a method of organizing reinforcing bar cages for concrete poles in which both are tied together at multiple locations in parallel to the concrete poles.

"Operation" By aligning one reference PC steel material 5' at a predetermined arbitrary position in parallel with the auxiliary vertical reinforcement 4 for positioning, and binding 4, 5' at multiple locations,
When the other 5 groups of prestressed steel members, which are in a miscellaneous hanging state in the non-tensioned reinforcement cage 3, are simultaneously tensioned via the end plate 7 in order to introduce prestress into them, the prestressed steel members 5 and 5' The rear end and the tip end are passed through the through holes of the base plate 6 and the end plate 7, respectively, and are locked at predetermined intervals in the circumferential direction, so that the auxiliary longitudinal reinforcements 4 of the non-tension reinforcement cage 3 are already connected to each other.
Based on the reference PC steel material 5' which is positioned and fixed at Placed.

In addition, the standard PC steel material 5' only needs to be aligned parallel to the auxiliary longitudinal reinforcement 4 for positioning and tied together at multiple locations, so the work of binding the PC steel material 5', which is the reference for positioning, is easier than in the past. Significantly simplified.

"Embodiment" Below, an embodiment of the present invention shown in the drawings will be described. When a spiral muscle 2 is wound around a non-tension muscle 1 arranged in an annular shape and a non-tension muscle cage 3 is braided, one Reference PC for auxiliary vertical bars 4 for positioning, which will be described later
It is arranged over almost the entire length along the position of the steel material 5', and is fixed to the spiral reinforcement 2 by welding or the like.

Then, a plurality of rods are riveted at the rear end and passed through the through holes of the base plate 6 inside the non-tensioning reinforcement cage 3.
After inserting the PC steel materials 5 and 5' and riveting their tips through the through holes of the support plate 7' and the end plate 7, the PC steel materials 5 and 5' are placed at a predetermined arbitrary position. A single prestressed steel material 5' is used as a fixed position reference for positioning and arranging it at the designed arrangement position, and this reference prestressed steel material 5' is attached to the auxiliary vertical reinforcement 4, and both 4 and 5' are connected with binding wires 8 at multiple locations. Tie (see Figures 1, 2, and 3).

In this way, one standard PC steel material 5' is positioned and held at the designed arrangement position of the non-tensioned reinforcement cage 3, and the other PC steel materials 5 are inserted into the non-tensioned reinforcement cage 3 with miscellaneous hanging. As shown in FIG. 5, the base plate 6 is placed in the pole forming form 9, and the base plate 6 with the rivets at the rear end of the PC steel members 5 and 5' is fixed therein, and the support plate 7' is inserted into the form frame 9. When the end plate 7 is fixed to the end of the support plate 7 and the prestressed steel members 5 and 5' to which the rivets at the tip are fixed are tensioned by a tension force introduction device 10 such as a hydraulic jack attached to the support plate 7'. As the other prestressed steel members 5 that are not positioned and are in a free state are also tensioned, the engagement of the base plate 6 and the end plate 7 is made with reference to the reference prestressed steel material 5' that has already been positioned and fixed to the non-tensioned reinforcement cage 3. It forms an annular shape corresponding to the stop position and is accurately, automatically and smoothly positioned and tensioned at the designed position.

"Effects of the Invention" As described above, according to the present invention, the reference PC steel material is aligned with the auxiliary vertical reinforcement for positioning and is tied together at multiple locations, which necessitates the complicated and time-consuming bundling work required in the past. It is possible to easily and efficiently position and tension the prestressing steel at the designed position within the non-tensioning bar cage with an extremely simple operation, making it possible to streamline and save labor in assembling reinforcing bar cages for concrete poles. It is possible to achieve improvement in sexual performance.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a reinforcing bar basket knitted by the method of this invention in an untensioned state, Fig. 2 is a perspective view showing a bundled state of standard prestressing steel materials according to this invention, and Fig. 3 is a longitudinal sectional front view of the same. FIG. 4 is a longitudinal sectional front view of a reinforcing bar cage showing a conventional method for positioning prestressing steel materials, and FIG. 5 is a partially cutaway side view showing the tensioned state of prestressing steel materials in the method of the present invention. 1... Non-tension muscle, 2... Spiral muscle, 3... Non-tension bar cage, 4... Auxiliary longitudinal bar for positioning, 5... PC steel material, 5'... Standard PC steel material, 6... Main opening plate ,
7... end plate, 8... binding wire, 9... formwork for forming pole, 10... tension device.

Claims (1)

[Claims] 1. When braiding a non-tensioning muscle cage by winding a spiral muscle around non-tensioning muscles arranged in an annular shape, one reference prestressing steel material is placed at an arbitrary position with one auxiliary vertical reinforcement for positioning set in advance. A plurality of PC steel members are fixed to the spiral reinforcement along the arrangement position, and riveted at the rear end in the non-tension reinforcement cage, and a plurality of PC steel members are inserted through the through holes arranged at the designed position of the base plate. After passing the tip through the through hole placed at the designed position of the end plate and riveting it, the standard PC steel material is aligned parallel to the auxiliary vertical reinforcement and both are tied at multiple locations. A method for organizing reinforcing cages for concrete poles.