JPH1177206A - Pile reinforcement cage knitting machine, and its knitting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To knit a highly aseismic concrete pile direction cage without breaking a welded part by providing the deflection in an arc shape by a deflection-providing means on a sub-reinforcement large in tensile strength, and spirally winding the sub- reinforcement around main reinforcements of prestressing steel bar which are arranged in the circumferential direction, and welding the sub-reinforcement thereto. SOLUTION: A plurality of main reinforcements 2 consisting of prestressing steel bar are arranged in the circumferential direction, and pulled out while being turned around the axis. A sub-reinforcement 3 large in tensile strength to be fed through a guide 19 is spirally wound around the main reinforcements 2, and welded thereto by a ring-shaped fixed electrode 17 and a rotary electrode 18 to knit a reinforcement cage to be embedded in a highly aseismic concrete pile. A deflection providing means 30 is arranged in the vicinity of a welded part of the main reinforcement 2 and the sub-reinforcement 3, and welding is achieved after the arc-shaped deflection of the curvature to be preferably agreed with the curvature of the main reinforcement group is provided on the sub-reinforcement 3. The deflection providing means 30 preferably presses the sub-reinforcement 3 by a second roller 32 provided between first and third rollers 31,33 provided e.g. on a base plate 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile reinforcing bar cage knitting machine for knitting a reinforcing bar cage embedded in a concrete pile for high earthquake resistance, and a method of knitting the pile reinforcing bar cage.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, a reinforcing rod cage (1) buried in a concrete pile has a predetermined number of main reinforcing bars (2) arranged circumferentially, and these main reinforcing bars (2) are attached to secondary reinforcing bars (2). 3)
Are welded and knitted while being wound spirally.

[0003]

In the knitting of reinforced cages knitted in this manner, particularly for knitting of reinforced cages buried in concrete piles for high earthquake resistance, a PC steel rod is used for the main reinforcement (2). It is desired that the secondary bar (3) be knitted using a reinforcing bar having a large tensile strength. However, in order to spirally reinforce a high-strength rebar, there is a problem that since the stress is large, the springback is strong and the welded portion is likely to come off. Therefore, the present invention is intended for high seismic resistance that can be knitted without losing the welded portion even if the springback is weakened by forcibly reducing the stress and the reinforcing bar having a large tensile strength is spirally wound and welded. It is an object of the present invention to obtain a concrete pile rebar cage knitting machine and a knitting method therefor.

[0004]

SUMMARY OF THE INVENTION The present invention provides the following pile reinforced basket knitting machine to achieve the above object. That is, in a knitting machine that knits a reinforcing bar cage embedded in a concrete pile by welding while spirally winding an auxiliary bar around a main bar arranged in a circumferential shape,
A pile rebar cage knitting machine characterized in that a crimping means for imparting an arc-shaped bending habit to a sub-reinforcement is disposed near a weld between a main rebar and a sub-reinforcement. At this time, it is desirable that the curvature of the arc-shaped bending habit provided by the hammering means matches the curvature of the main reinforcing bars arranged in a circumferential shape. The habit forming means is constituted by three rollers, and preferably, the roller is configured to be adjustable in position, or is configured by three sets of blocks, and the block is preferably configured to be adjustable in position. I do.

[0005] The present invention also provides a pile reinforcing bar cage knitting method as described below. In other words, in a knitting method of knitting a reinforcing bar cage embedded in a concrete pile by welding while spirally winding a sub-reinforcing around a main reinforcing bar arranged in a circumferential shape, the sub-rebar is disposed near a welded portion between the main reinforcing bar and the sub-rebar. A pile reinforcing bar cage knitting method characterized in that an arc-shaped bending habit is given to a sub-reinforcement by means of a crimping means, and then the sub-reinforcement is welded to a main rebar. In this method as well, it is desirable that the curvature of the arc-shaped bending habit provided by the hammering means match the curvature of the main bars arranged circumferentially.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings. In the present invention, a reinforcing steel cage to be embedded in a concrete pile for high earthquake resistance is knitted. Therefore, a PC steel rod is used for the main bar.
As shown in FIG. 1, the plurality of main reinforcements (2) group includes the knitting machine (1).
0), a plurality of cylindrical pipes (not shown) projecting from the peripheral edge of a disk-shaped support (12) provided on both the front part (11) and the rear part are inserted from behind and arranged circumferentially. The distal end is fitted and locked in a locking hole (not shown) facing the plurality of cylindrical pipes formed in a disc-shaped gripping body (14) provided in the cart (13). The trolley (13) is driven by a driving device provided inside the trolley (1).
5) By moving forward at a predetermined speed on the support (1)
It is designed to be gradually pulled backward from the peripheral portion of 2).

A gear is formed on the outer periphery of the ring-shaped holder (16) provided on the outer periphery of the support (12), and the gears are engaged with the gears (21) and (22). One of the gears (21) has a sprocket (2).
3) is provided, and a chain (26) is wound around the sprocket (23) and a sprocket (25) of a motor (24) as a driving unit, so that the holder (16) is rotationally driven.

[0008] As described above, the group of main bars (2) arranged circumferentially is pulled out of the support (12) as the carriage (13) advances on the gantry (15). Then, the auxiliary reinforcing bar (3) drawn from the coil stand (20) is spirally wound around the drawn main reinforcing bar (2) group and welded to knit a reinforcing bar cage (1). The welding of the secondary bar (3) is performed in front of the support (12) as shown in FIG.
Ring-shaped fixed electrode (17) arranged inside a cylindrical tube
And a rotating electrode (1) arranged outside the fixed electrode (17).
8) and the fixed electrode (17)
A secondary bar (3) is inserted between the rotating electrode (18) and welding. The rotating electrode (18) is attached to the ring-shaped holder (16).

The secondary bar (3) applied to the present invention has a yield point of tensile strength of, for example, twice or more that of a normal reinforcing bar, and has a very high springback in order to produce a concrete pile for high earthquake resistance. It is strong. Therefore, the auxiliary streaks (3) pulled out from the coil stand (20) are supplied to the welding portion through the guide (19) attached to the holder (16), and are supplied to the fixed electrode (17) and the rotating electrode (1).
There is a very high possibility that it will soon come off simply by welding in 8).

Therefore, in the present invention, the secondary bar (3) supplied from the guide (19) is forcibly bent into an arc shape before being welded by the fixed electrode (17) and the rotating electrode (18). The spring back was weakened so that the welded portion with the main bar (2) did not come off. As means (30) for forcibly bending the accessory muscle (3) to bend in an arc shape, first, as shown in FIG.
A first roller (31), a second roller (32), and a third roller (3) arranged so as to be staggered in a plan view.
There is a method according to 3).

Each of these three rollers (31) (32)
In (33), the bearing portion is bolted to a predetermined location in the base plate (34), and is disposed so as to be adjustable in position by an arbitrary adjusting means (not shown) such as a long hole. The base plate (34) is mounted on the holder (16) by mounting means such as bolts. As shown in FIG. 3, grooves (31a), (32a), and (33a) into which the auxiliary streaks (3) are inserted are formed on the outer peripheral surfaces of the rollers (31), (32), and (33). And a first roller (31) and a third roller (33)
A second roller (32) located between the first roller (31) and the third roller (33) shown in FIG. 2 is disposed so as to slightly overlap the common external tangent (T). ing.

Therefore, each groove (31a) (32a)
The accessory muscle (3) inserted so as to pass through (33a) is
With the roller (32) as a fulcrum, the first roller (31) and the third roller (33) are bent into a mountain shape pressed down from both sides, and are finally formed into an arc shape. At this time, the position of the second roller (32) is relatively adjusted with respect to the first roller (31) and the third roller (33), so that the group of the main reinforcements (2) arranged circumferentially is adjusted. It is desirable to add a curvature to the shape of an arc that matches the curvature.

As described above, if the secondary reinforcing bar (3) is formed into an arc shape before welding, the stress can be reduced even if the tensile strength is large, so that the circumferentially disposed main reinforcing bar (2) is formed. ) Even if the group is spirally wound, the springback does not weaken and the welding with the main bar (2) does not come off. As another means (40) for forcibly bending the accessory muscle (3) to bend in an arc shape, as shown in FIG. 4, a first means (40) arranged so as to be staggered in a plan view.
There is a method using a block (41), a second block (42), and a third block (43).

Each of these three blocks (41) (42)
The base plate (43) is disposed at a predetermined position in the base plate (44) so as to be adjustable in position. The base plate (44) is mounted on the holder (16) by mounting means such as bolts (45). In addition, each block (4
1) In the middle part of (42) and (43), the auxiliary groove (3) is inserted, and the both ends of the groove (4) are extended.
1a) (42a) and (43a) are formed, and three sets of bolts (46) screwed to the base plate (44).
According to (47) and (48), each groove (41a) (42)
a) The arrangement position of (43a) is adjusted. That is, each block (41) (42) (43)
Is a pair of bolts (46) (4
7) and (48) are configured to be slidable, and each block (41) (42) is formed by a screw action for rotating each bolt (46) (47) (48).
(43) is pressed to adjust the arrangement position, and the positions of the grooves (41a) (42a) (43a) are adjusted so that the blocks (41), (42) and (43) are alternately shifted in plan view. I have to.

Therefore, similarly to the above, the groove (42a) of the second block (42) is divided into the groove (41a) of the first block (41) and the groove (43) of the third block (43).
If the position is set so as to protrude outward so as to overlap with the line (S) connecting (a), the accessory muscle (3) inserted through each groove (41a) (42a) (43a) ) Is bent into a mountain shape which is pressed from both sides by the first block (41) and the third block (43) with the second block (42) as a fulcrum, and finally bent into an arc shape. You. At this time, the arrangement positions of the blocks (41), (42), and (43) are adjusted,
It is desirable to form a circular arc with a curvature that matches the curvature of the group of main bars (2) arranged circumferentially. Further, when such a block is used, there is an advantage that the position of the groove is adjusted by turning the bolt, so that fine position adjustment is possible.

As described above, according to the present invention, even if a secondary reinforcing bar having a yield point of tensile strength of twice or more that of a normal reinforcing bar and having a very strong springback, it can be embedded in a concrete pile. It can be used for knitting. Therefore, an extremely suitable concrete pile for high earthquake resistance can be obtained. In addition, the present invention
It is only necessary to be able to preform the secondary muscles in an arc shape. The above-described two embodiments have been described as examples of the protruding means, but the present invention is not limited to these. Needless to say, the design may be appropriately changed within the spirit of the present invention.

[0017]

According to the present invention, when knitting a reinforcing rod cage to be embedded in a concrete pile by welding while spirally winding a secondary reinforcing bar around a main reinforcing bar arranged circumferentially, the main reinforcing bar and the secondary reinforcing bar are kneaded. Since the arcuate bending habit is forcibly applied to the accessory bar by the attachment device disposed near the welded portion, the stress of the accessory bar can be reduced, and the springback can be weakened. Even with a reinforcing bar having a large tensile strength, a reinforcing bar cage can be knitted without leaving a welded portion with the main bar. In particular, if the curvature of the arcuate bending habit matches the curvature of the circumferentially arranged main reinforcement, the welded portion with the main reinforcement does not have to be further removed. Therefore, it has become possible to manufacture an extremely suitable concrete pile for high earthquake resistance. In addition, if the hammering means is constituted by three rollers or three sets of blocks, it can be easily mounted near the welded portion and has an advantage that it can be easily implemented, and the positions of the rollers and the block can be adjusted freely. In this case, the curvature can be easily matched with the curvature of the main reinforcing bars arranged in a circumferential shape.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a reinforcing bar knitting machine.

FIG. 2 is a plan view showing a habit forming unit.

FIG. 3 is a side view of the above.

FIG. 4 is a plan view showing another habit forming means.

FIG. 5 is a schematic explanatory view showing a rotation drive mechanism of a support and a holder.

FIG. 6 is a perspective view of a reinforcing rod cage.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Reinforcing bar 2 Main bar 3 Secondary bar 10 Knitting machine 12 Support body 13 Cartridge 14 Gripping body 15 Mount 16 Holder 17 Fixed electrode 18 Rotary electrode 19 Guide 20 Coil stand 31 First roller 32 Second roller 33 Third roller 34 Base plate 41 1 block 42 2nd block 43 3rd block 44 Base plate

Claims (4)

[Claims] 1. A knitting machine for knitting a reinforcing bar cage embedded in a concrete pile by welding while spirally winding a secondary reinforcing bar around a circumferentially disposed main reinforcing bar. A pile reinforcing bar cage knitting machine, characterized in that a crimping means for imparting an arc-shaped bending habit to an auxiliary bar is provided. 2. The method according to claim 1, wherein the setting means includes three rollers (31,
32, 33) or 3 sets of blocks (41, 42, 43)
The pile reinforced cage knitting machine according to claim 1, wherein the pile reinforced basket knitting machine is constituted by: 3. A knitting method for knitting a reinforcing bar cage embedded in a concrete pile by welding while spirally winding a sub-rebar around a main bar arranged circumferentially, comprising: A pile reinforcing bar cage knitting method, wherein an arc-shaped bending habit is given to a sub-reinforcement by means of a provided knitting means, and then the sub-reinforcement is welded to a main rebar. 4. The knitting of pile rebar cage according to claim 3, wherein the curvature of the arcuate bending habit provided by the kinking means matches the curvature of the main reinforcing bars arranged circumferentially. Method.