JPH0819673B2 - High bending toughness PC pile cage assembly method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of assembling a cage for a high bending toughness PC pile for assembling a cage composed of reinforcing bars used for a high bending toughness prestressed concrete pile (hereinafter referred to as a PC pile).

[0002]

2. Description of the Related Art Conventionally, there has been used a PC pile, that is, a PC pile in which a tension bar made of a PC steel material is embedded in the longitudinal direction and a prestress in the longitudinal direction is applied to the whole. Further, in recent years, a high bending toughness PC pile having improved bending toughness by arranging spiral reinforcements (lateral restraint reinforcements) has been developed.

[0003] It is preferable that the lateral restraint muscles of the high bending toughness PC pile are arranged near the surface of the PC pile away from the tension muscles made of PC steel. Therefore, the present inventor, as shown in FIG. The supporting muscles 1 for supporting the spiral muscles are arranged in a cylindrical shape, the spiral muscles 2 are fixed to the outer side of the supporting muscles 1 to assemble them into a cylindrical basket shape, and tension is applied to the supporting muscles 1 in the form 3 so that the spiral muscles 2 are predetermined. We have developed the manufacturing of PC piles so that they can be placed in position (Japanese Patent Publication No. 5-17009).

[0004]

Such a conventional PC
In the manufacture of a pile, it is necessary to insert a tension muscle made of PC steel, which is the main muscle, into a cylindrical cage composed of the support muscles 1 and the spiral muscles 2, and the tension muscles 4 are tensioned to introduce prestress. It must be placed in parallel because it is a thing. Moreover, there are tens muscles that can reach a dozen meters, and since a large number of those having a thickness of about 7 to 14 millimeters are used, it is very difficult to manually perform the insertion work and the positioning work for both ends of each tense muscle. There is a problem that it takes labor and time.

In view of the above problems, the present invention provides a method of assembling a cage for a high bending toughness PC pile, in which the insertion and positioning of the tense muscles are performed accurately during the cage assembly including the spiral muscles. It was done for the purpose.

[0006]

The gist of the present invention for achieving the above-mentioned object is to provide a guide device for positioning a plurality of supporting muscles for supporting a spiral muscle in a cylindrical arrangement, and Using a drawer device that engages and draws out the tips of the support muscles positioned by the guide device, and a spiral winding device that causes spiral muscles to lie along the outside of the support muscles that are drawn out at a constant pitch. , Has a large number of support-muscle fitting parts arranged in a circular shape on the outer periphery,
Insert a number of tension muscles in a circular arrangement with a space on the center side
The tip side end plate having the hole is fixed, and the supporting device is tensioned to the guide device in the same arrangement as the tip side end plate.
A rear end side end plate having a muscle insertion hole is fixed, and a tip of the support muscle and a tip of a tension muscle made of PC steel are fitted to the support muscle fitting portion and the tension muscle insertion hole of the tip end plate. And the supporting muscle fitting part of the end plate on the rear end side and the insertion of the tension muscle.
For a high-bending toughness PC pile, characterized in that a spiral muscle is wound around and fixed to the outside of the support muscle while simultaneously pulling out the support muscle and the tension muscle by the pulling-out device while guiding the support muscle and the tension muscle in the hole . It depends on how to assemble the basket.

[0007]

According to this method of assembling the cage for high bending toughness PC piles, the spiral muscle is fixed to the support muscle and at the same time, the tension muscle is inserted into the cylindrical cage formed by the fixation.

Further, since the front end side and the rear end side of the tension muscles are guided by the both end plates, the respective tension muscles are drawn in parallel and are moved into the mold together with the both end plates, so that the tension muscles at both ends are Positioning work becomes unnecessary.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a state in which a basket assembled according to the present invention is accommodated in a mold, and concrete is cast and centrifugally molded. In the drawing, 10 is a cylindrical mold and 11 is a cylindrical mold. Concrete, 12a and 12b are end plates, 13
Is a hakama fitting fixed to the end plates 12a and 12b. The basket is
It is composed of a tension muscle 14 made of PC steel, and a spiral muscle 15 and a support muscle 16 for holding a spiral muscle made of a straight bar reinforcement,
Both ends of the tension muscles 14 and the support muscles 16 are both end plates 12a, 12
It penetrates b and is screwed to the tension support fittings 17a and 17b. One of the tension support metal fittings 17a is supported by abutting against the end portion of the mold 10, and the other tension support metal fitting 17b is inserted into the frame 10 and fixed via the pull rod 18 to the fixing plate 19.
The fixing plate 19 is in contact with the end surface of the mold 10. Then, pull the pull rod 18 into the jack 2
By tensioning at 0, the tension muscles 14 are tensioned, and at the same time, the support muscles 16 are stretched linearly, whereby the spiral muscles 15 are positioned at predetermined positions in the mold.

After applying a certain tension, the nut 19a is rotated to move the fixing plate 19 so that the fixing plate 19 is brought into contact with the end face of the mold so that the tension is maintained even if the jack is removed.

As shown in FIG. 2, the basket thus assembled is assembled by a guide device comprising a cored bar 21 and a perforated guide plate 22, a pull-out device 23 for pulling out the supporting muscles 16 and the tension muscles 14 in the longitudinal direction, Outside the core bar 21, the spiral 15
A spiral winding device 24 for winding the wound wire and a fixing device 25 for fixing the wound spiral muscle 15 to the support muscle 16 are used.

The pulling device includes a pulling carriage 31 which moves on a guide rail 30 and an endless drive chain 32 which is provided along the guide rail 30 for moving the pulling carriage 31.
It consists of

The spiral winding device 24 has a shaping roller 34 supported by a rotary cylinder 33 which is rotationally driven outside the cored bar 21, and a spiral reinforcing reel 35 arranged concentrically outside the rotary cylinder 33. , The steel wire for the spiral muscle from the reel 35 through the guide tube 36 and is sent to the mold roller 34.
It is shaped into a small circle at 4 and is fed out of the cored bar.

The fixing device 25 includes the same number of binding machines 37, 37, ... As the number of supporting bars radially arranged on the front outer circumference of the cored bar 21.
It consists of ...

Next, the assembling work of the basket using the device constructed as described above will be explained. As shown in FIG. 2, the front end plate 12a is provided on the rear surface of the bracing fixture 31a of the carriage 31.
And the rear end side end plate 1 on the front end face of the cored bar 21.
Fix 2b.

[0017] The end plates 12a, 12b is formed into a donut shape with the opening in the central portion as shown in FIG. 3, concave 38 ...... circular on the outer peripheral portion is a coupling portion fitted support muscle
In addition to being formed in a disposition, tension muscle insertion holes 39, 39 ... Are opened in a circular arrangement on the center side thereof.

After that, the supporting muscles 16 and the tension muscles 14 are passed through the guide plates 22, and the tension muscles 14 are moved from inside the core bar 21 to the both end plates 1.
2a, 12b through the strainer insertion holes 39, 39 ...
Pass through the fixing bracket 31a of the dolly 31 and attach the nut 14a to the tip.
Screw it in to prevent it from coming off. Further, the support bar 16 is provided along the outer periphery of the cored bar 21, and the recesses 38, 38 of the end plates 12a, 12b are provided.
The fixing metal fitting 31a is penetrated like the tension muscle 14 and is prevented from coming off by the nut 16a.

In this state, the pulling carriage 31 is moved to pull out the support bar 16 and the tension bar 14, and the spiral winding device 24 is operated to move the spiral bar 15 outside the cored bar 21 to the support bar 16 extending along the cylindrical range. Wrap around the outside. The spiral muscle 15 is wound by fixing the tip of the spiral muscle 15 to one of the support muscles 16 and rotating the rotating cylinder 33 together with the reel 35 so that the spiral muscle 15 is shaped into a small circle and wound.

After the spiral muscles 15 for one or several pitches are wound in this way, the winding and the withdrawal are stopped, and the binding machines 37 are operated to activate the spiral muscles 15 and the tension muscles 1.
Bundle the intersections with 4, 14 ... to form a cylindrical basket.

This operation is repeated in sequence to form a cylindrical basket of a predetermined length and to draw the tendons into it, and the rear end plate 12 near the ends of the tendons 14 and supporting muscles 16.
Remove b from the core metal and attach the front end side
Remove from 1a. As a result, as shown in FIG.
End plates 12a, 12 on both ends of the cylindrical basket composed of 6 and spiral bar 15
Assembling of the cage in which b is incorporated and the tension muscles 14 are inserted into the cylindrical cage so that both ends are supported by the predetermined holes of the end plates 12a and 12b.

This basket is carried into the mold 10 and the above-mentioned P
Form a C pile.

In the above-mentioned embodiment, the supporting bar 16 and the spiral bar 15 are fixed by the binding machine, but the two bars 15, 16 may be fixed to each other by spot welding as in the conventional case depending on the application. .

[0024]

As described above, in the present invention, when the spiral bar is supported by the supporting bar and assembled into a cylindrical cage, end plates are arranged at both ends of the spiral bar, and the tension bar is passed through the end plate to make the cylindrical cage. By assembling the tendon muscle into it at the same time as assembling, it is not necessary to insert the tendon muscle later, and since both ends of the tendon muscle are penetrated by the end plates, This makes it possible to easily perform end selection and fixing work for tension.

[Brief description of drawings]

FIG. 1 P using a basket assembled by the method of the present invention
It is sectional drawing which shows a C pile manufacturing process.

FIG. 2 is a sectional view of an example of an apparatus for carrying out the method of the present invention.

FIG. 3 is a front view of an end plate used in the method of the present invention.

FIG. 4 is a cut end view of an example of a basket assembled by the method of the present invention.

FIG. 5 is a sectional view showing a conventional technique.

[Explanation of symbols]

 10 Molding Form 11 Concrete 12a, 12b End Plate 13 Hakama Metal Fitting 14 Tensor Muscle 15 Spiral Muscle 16 Support Muscle 16a Nut 17 Tension Bearing Metal Fitting 18 Pull Rod 19 Fixing Plate 19a Nut 21 Core Bar 22 Guide Plate 23 Drawer 24 Spiral Winding Device 25 Fixing device 30 Guide rail 31 Tension cart 31a Muscle fixing metal fitting 32 Endless drive chain 33 Rotating cylinder 34 Molding roller 35 Spiral reel 36 Guide cylinder 37 Binding machine 38 Concave 39 Tension muscle insertion hole

Claims (1)

[Claims] 1. A guide device for positioning a plurality of support muscles for supporting a spiral muscle in a cylindrical arrangement, a drawer device for engaging and withdrawing the tips of the support muscles positioned by the guide device, and a drawer thereof. Using a spiral winding device that allows spirals to run along the outside of the supporting bar at a constant pitch, the drawing device has a circular arrangement on the outer peripheral part.
It has a large number of supporting muscle fittings and is spaced on the center side.
The tip side end plate having a large number of strainer insertion holes is fixed in a circular arrangement, and the guide device is connected to the tip side end plate.
The rear end side end plate having the support muscle fitting portion and the tension muscle insertion hole is fixed to the same arrangement, and the support muscle fitting portion of the front end side plate and
The tip of the supporting muscles and with fitting the tip of the tensioning muscles consisting PC steel tension muscle insertion hole of the rear end plate
While the support muscle and the tension muscle are guided by the support muscle fitting portion and the tension muscle insertion hole , the support muscle and the tension muscle are simultaneously pulled out by the pulling-out device, and the spiral muscle is wound around and fixed to the outside of the support muscle. High bending toughness PC
How to assemble a pile basket.