JPH0556211B2 - - Google Patents

Description

[Detailed Description of the Invention] "Field of Industrial Application" This invention relates to a method for organizing reinforcing bar cages for relatively large-diameter concrete columns such as large-diameter piles or continuous walls, and a prestressing steel material used in this method. The present invention relates to a temporary tensioning device.

``Prior art and problems to be solved by the invention'' The conventional method of organizing reinforcing bar cages for concrete columns consists of a movable side and a fixed side, in which front and rear end fittings are disposed oppositely so that they can be moved in relative directions along the rail. Fix each end plate to the end plate cart, move the movable end plate cart backwards with a winch to near the fixed end plate cart, and insert the PCs one by one by hand into the numerous insertion holes provided on the annular end faces of both end plate fittings. After inserting the steel material, a rivet head forming machine is used to form a rivet head at the tip of each PC steel material, and then the movable end plate cart is moved forward and the end plate fixed thereto is transferred to the movable abutment fixed to the tensioning cart. At the same time, the end fitting of the fixed side end plate cart is connected with a wire to the fixed abutment fixed to the fixed reaction force table, and in this state, the tensioning cart is pulled by a tensioning winch and moved via the connecting wire. By moving the side end plate together with the moving side end plate cart.
After pre-tensioning the prestressing steel materials and tying the guide cage that has been loaded on the inner circumference of the prestressed steel material group to each prestressing steel material, wrap a spiral reinforcement around the outer circumference of this prestressed steel material group and bind both with the binding wire. I am taking a method.

By the way, in this method, since the end metal fittings are fixed to the moving side and fixed side end plate carts,
When inserting prestressing steel materials one after another into the insertion holes provided along the circumference of these end metal fittings, the worker may have to stretch his or her back in the insertion holes at the upper end of the end metal fittings.
Inserting the prestressing steel material and inserting it into the insertion hole at the lower end of the end metal fitting requires the worker to bend down and insert the material, which necessitates working in a cramped position while changing the working posture each time. Therefore, there was a problem in that the insertion work required a great deal of labor.

In addition, when pre-tensioning prestressing steel materials, it is necessary to screw a hook into the hanging bolt hole of the end metal fitting and connect a connecting wire to this hook, and furthermore, it is not possible to rotate the reinforcing bar cage that is pre-tensioned to the fixed end metal fitting. Two workers are working from both sides of the reinforcing bar cage to bind the stretched prestressing steel material and the spiral bar, and as with the above-mentioned prestressing steel material insertion work, they are working by stretching up the upper prestressing steel material. However, when working with the lower PC steel material, it was necessary to bend down to work, making the work complicated and requiring a heavy labor burden, resulting in problems such as poor work efficiency.

"Means for Solving the Problems" In order to solve the above-mentioned conventional problems, the present invention has the following features:
A chucking arm is attached to the inner periphery of the end fitting so that it can be rotated around a horizontal central axis by a motor, and can be expanded and contracted as a whole in radial directions around the horizontal central axis. A pair of front and rear carts are installed with their chucking arms facing each other so that they can be driven forward and backward in relative directions.
Chuck the end metal fittings to the chucking arm of each truck, insert multiple pieces of PC steel material into the insertion holes while rotating each end metal fitting appropriately, form rivet heads at their tips, and then By moving the trolley, the prestressing steel material is temporarily tensioned while being locked to the end metal fitting by the rivet head at the end, and in this state.
By arranging spiral reinforcement around the PC steel material and binding the spiral reinforcement to the PC steel material while rotating the chucking arm appropriately, the end fitting installation work, PC
Inserting and fixing steel materials, binding spiral bars and prestressed steel materials, removing organized reinforcing bar cages, etc.
This paper proposes a method for organizing reinforcing bar cages for concrete columns that can be carried out efficiently with a comfortable posture and a light labor burden, and a temporary tensioning device for prestressing steel used in this method.

``Embodiment'' Hereinafter, an embodiment of the present invention shown in the drawings will be described. A tensioning trolley 2 and a stripping trolley 3 are movably installed on a rail 1 laid in a straight line on the floor of a reinforcing bar basket knitting section.

An operating body 5 supported by a support column 4 is provided on the tensioning trolley 2 and the shaking trolley 3, and a plurality of chucking arms 6 are provided at the horizontal ends thereof to expand and contract as a whole in the radial direction. A freely pivotable rotary head 7 is mounted to be rotatable about a horizontal central axis, and this rotary head 7 is configured to be rotated by a rotary motor 8 attached to the rear end of the actuating body 5. .

A plurality of slits 9 are formed in the rotating head 7 at predetermined intervals in the circumferential direction, and the rear end of each chucking arm 6 is pivoted into the rear part of the slit 9 by a pin 10. It is installed so that it can be expanded and contracted so as to rotate in the radial direction about the rotation axis of the rotating head 7 to open and close the umbrella as a whole.

A screw rod 11 is rotatably supported in the center hole 7' of the rotary head 7, and a movable nut 12 is fitted into the screw rod 11. A link arm 14 whose both ends are pivotally connected by pins 13 and 13' is connected to the intermediate portion.

The screw rod 11 is engaged with a worm gear 16 attached to the shaft end of a handle 15 that is rotatably provided outside the actuator body 5, and the screw rod 11 is rotated in forward and reverse directions by rotating the handle 15 in forward and reverse directions.
By rotating forward and backward, the movable nut 12 is moved forward and backward, thereby expanding and contracting the chucking arm 6 as a whole in the radial direction via the link arm 14.

A hook-shaped locking pawl 6' is provided at the tip of each chucking arm 6 and projects outward in the radial direction. Annular end fittings 17, 1 are attached to the outer periphery of the metal parts in a state in which they are completely contracted.
7' and in this state rotate the handle 15 to rotate each tracking arm 6 outward.
By expanding in the radial direction as a whole, the tip of the chucking arm 6 can be crimped onto the inner periphery of the end metal fittings 17, 17', and can be chucked by locking it with the locking claw 6' at the tip so that it cannot fall off. It's becoming like that.

In this way, the front and rear end fittings 1 are attached to the chucking arms 6 of the tensioning cart 2 and the shaking cart 3.
7, 17' and move the carts 2, 3 closer to each other. First, insert the PC steel material 19 into the numerous insertion holes 18 drilled in the end plate of the rear end fitting 17'. After inserting it, move it to trolley 2,
The hanging handle 20' of the hanging device 20 installed between the
It is inserted into the inside of the spiral muscle 21 which has been suspended in a contracted state in advance, and is further inserted into a large number of insertion holes 18 formed in the end plate of the front end fitting 17.

At this time, the workers before and after the insertion work stand on one side of the end metal fittings 17 and 17', respectively, and operate the tensioning trolley by operating a handle switch held by the worker or a switch on the operation panel operated by another worker.
and drives the rotary motor 8 of the shaking cart 3,
While sequentially rotating the end fittings 17 and 17' together with the rotating head 7, insert the PC into the insertion hole 18 that is closest to you.
Since the steel material 19 can be inserted, the insertion work can be performed quickly and smoothly with little effort.

After inserting the PC steel material 19 into the insertion hole 18 of the front and rear end fittings 17, 17' in this manner, the tip thereof is dielectrically heated and press-formed in the riveting head forming machine 22 to form the riveting head 19'. .

The rivet head forming machine 22 is installed on a parallel carriage 24 running on a rail 23 laid parallel to the rail 1, on a movable platform 25 that is movable in a direction perpendicular to the running direction of the carriage 24.

The parallel carriage 24 is connected to the operating carriage 3' connected to the rear part of the squeezing carriage 3 via a guide rail 26 which also serves as a connecting member, and the moving carriage 25 is mounted on the operating carriage 3' along this guide rail 26. The movable table 2 is designed to move when forming the rivet head 19'.
5 and move the rivet head forming machine 22 onto the operating carriage 3'.

In this way, the rivet head 19' is formed on the tip of the PC steel material 19 inserted through the front end metal fitting 17, and after the rivet head forming machine 22 is moved backward together with the movable table 25 onto the parallel carriage 24, the tension is applied. With the lifting trolley 2 fixed, the ironing trolley 3 is moved backward in the direction away from it, and along with this, the PC steel material 19 with the riveted head 19' locked to the end plate of the front end fitting 17' is pulled. While tightening the rear part of the PC steel material 19 that is irregularly intertwined and extending behind the rear end fitting 17', the rivet head 19' preformed on the rear end is pressed against the end plate of the end fitting 17'. Pull it out until it locks into the
A PC steel material 19 is connected and held between the front and rear end fittings 17, 17'.

The scrubbing trolley 3 is connected to a drive chain 27 rotatably installed on the floor along the rail 1, and is configured to move forward or backward by forward and reverse rotation.

In addition, a ratchet pawl 28 is protruded from the bottom of the scrubbing cart 3 and engages with a rack 29 installed on the floor below. for,
It rotates around the pivot shaft 30 at its upper end as a fulcrum and slides on the rack 29, and when the squeeze cart 3 is moved back to a predetermined position and stopped, the ratchet pawl 28 engages the rack 29 and its rear end engages the stopper 31. It is designed to stop and fix the traveling movement in the direction of the tip.

In addition, when moving the squeezing cart 3 forward toward its tip, the ratchet pawl 28 is pulled upward by a lifting device such as a hydraulic cylinder 32, and the ratchet pawl 28 is disengaged from the rack 29 so that it can move freely. It's summery.

In this manner, the tensioning cart 3 is stopped and fixed from moving toward the tip.
move backward in the direction away from the shaking cart 3,
Each PC steel material 19, whose rivet heads 19' at both ends are secured to the front and rear end fittings 17, 17', is temporarily tensioned.

The tensioning cart 2 is connected to the tip of a telescopic rod 33' of a hydraulic cylinder 33 whose rear end is fixed on the floor, and the tensioning cart 2 is configured to move backward by extending the cylinder 33.

After pre-tensioning the prestressing steel materials 19, the spiral reinforcements 21 in a contracted state, which have been surrounded in advance, are expanded and wound spirally at regular intervals. The intersections of the prestressing steel materials 19 and the guide baskets 34 previously loaded inside the group of prestressed steel materials 19 are sequentially tied together with wire.

During this tying work, a PC must be located nearby so that the worker can do the tying in a comfortable position while standing.
After working along the steel material 19 and completing the binding work at that location, the tensioning trolley 2 and the shaking trolley 3 are rotated by operating a handle switch held by the worker or a switch on the operation panel operated by another worker. While driving the motor 8 and sequentially rotating the end fittings 17 and 17' together with the rotary head 7, the binding work is carried out sequentially along the prestressing steel material 19 rotating to a nearby position, and all the prestressing steel material 19 on the entire circumference is tied. By completing the binding work, the reinforcing bar cage 35 is organized.

The organized reinforcing bar cage 35 is temporarily supported on a lifting and conveying device such as a crane, and in this state, the chucking arms 6 of the tensioning trolley 2 and the shaking trolley 3 are tilted toward the rotation center of the operating body 5. After deflating the entire body and releasing both end fittings 17 and 17', the tensioning cart 2 and the squeezing cart 3 are moved back in a direction away from each other, and the chucking arm 6 is removed from both end fittings 17 and 17'. After pulling it out, it is lifted and transported to the stockyard.

"Effects of the Invention" As described above, according to the present invention, a pair of front and rear carts each having a chucking arm which is chucked around the end face fitting and rotatable around a horizontal center axis by a motor are connected to each other. Install the chucking arms so that they can move forward and backward in the relative directions, chuck the end metal fittings on the chucking arms of each trolley, and insert multiple pieces of PC steel material into the insertion holes while rotating each end metal fitting appropriately. After inserting
By moving the carts away from each other
The prestressing steel material is temporarily tensioned while being locked to the end metal fitting using the rivet head formed at its end, and in this state, the spiral reinforcement is placed around the prestressing steel material, and the spiral reinforcement is placed by rotating the chucking arm appropriately. Since it is tied to the prestressed steel, the end fittings can be mechanically rotated to attach the end fittings, insert and fix the prestressed steel, tie the spiral bars and the prestressed steel, and remove the organized reinforcing bar cage. This can be done efficiently in a comfortable posture and with a light labor burden, making it possible to improve the efficiency of reinforcing bar formation, save labor, and improve work efficiency.

[Brief explanation of drawings]

Fig. 1 is a plan view of a pre-tensioning device for prestressing steel materials for forming reinforcing bar baskets according to the present invention, Fig. 2 is a side view of the same, and Fig. 3 is a diagram of a cart for ironing used in the pre-tensioning device for prestressing steel materials for forming reinforcing bars according to the present invention. Partial longitudinal side view, Figure 4 is the 1st
FIG. 5 is a sectional view taken along line BB in FIG. FIG. 3 is a partial vertical cross-sectional view showing a state in which the metal fittings and the prestressing steel material are engaged. DESCRIPTION OF SYMBOLS 1...Rail, 2...Tensioning trolley, 3...Straining trolley, 4...Strut, 5...Operating body, 6...
Chatting arm, 7... Rotating head, 8...
Rotating motor, 9...slit, 10...center hole, 11...screw rod, 12...movement nut, 13, 13'...pin, 14...link arm, 15...handle, 16...worm gear , 17, 17'... end metal fitting, 18... insertion hole,
19... PC steel material, 19'... Rivet head, 20... Hanging device, 20'... Hanging hand, 21... Spiral bar, 22
... Rivet head forming machine, 23 ... Rail, 24 ... Parallel trolley, 25 ... Moving platform, 26 ... Guide rail,
27... Drive chain, 28... Ratchet pawl,
29...Lock, 30...Pivot, 31...Stopper, 32...Hydraulic cylinder, 33...Hydraulic cylinder, 33'...Telescopic rod, 34...Rebar cage.

Claims (1)

[Scope of Claims] 1. The inner peripheral part of the end fitting is chucked so that it can be rotated around a horizontal central axis by a motor, and is pivoted so as to be freely expandable and contractible in the radial direction about the horizontal central axis. A pair of front and rear carts each having a plurality of chucking arms attached thereto are installed so that the chucking arms face each other and can be driven forward and backward in relative directions, and an end metal fitting is chucked to the chucking arm of each of the carts. , insert a plurality of prestressing steel materials into the insertion holes while rotating each end metal fitting appropriately, form rivet heads on the ends, and then move the trolley in a direction away from each other to insert the prestressing steel materials into the ends. Temporarily tension it while locking it to the end metal fitting with the rivet head of the part, arrange the spiral reinforcement around the PC steel material in this state, and rotate the spiral reinforcement into the PC steel material while appropriately rotating the chucking arm. A method of organizing a reinforcing bar cage for a concrete column body characterized by bundling. 2 A rotating body that can be rotated around a horizontal central axis by a motor, has a locking claw at its tip that can be locked to the inner peripheral part of the end metal fitting, and is generally rotated in a radial direction about the horizontal central axis. A concrete column body comprising a pair of front and rear carts each having a plurality of chucking arms installed so as to be expandable and retractable, with the chucking arms facing each other so that they can be driven forward and backward in relative directions. Temporary tensioning device for prestressed steel used in the method of organizing reinforcing bar cages.