JP2003170237A - Lattice muscle bending apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lattice muscle bending apparatus capable of manufacturing lattice muscles of a pitch in a desired dimension. <P>SOLUTION: The lattice muscle bending apparatus disposes one upper string muscle and two lower string muscles in a triangular state, welds the upper string muscle to the upper side bent part of the lattice muscle bent in a wavy state, and welds the lower string muscle to the lower part of the lattice muscle to constitute a self-standing truss. The apparatus comprises a feeding base 1 moving along a base mount A, a moving chuck 11 provided at the base 1, a static chuck 21 provided at the base mount A for retaining and holding the lower side bent part of the bent wire 5, and an upper side bend part forming member 3 moving in the same direction at a substantially half speed of the chuck 11 in cooperation with the chuck 11 and always being disposed at a substantially center between the chuck 11 and the chuck 21 to press the wire 6 in a direction crossing with the wire 6 by a bending head 32 to form the upper side bend part. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lattice reinforcement bending process for bending a lattice reinforcement of a self-standing truss used for a structural material composed of a grooved iron plate used for constructing a concrete floor slab and a self-standing truss. Regarding the device.

[0002]

2. Description of the Related Art In the construction of a conventional concrete floor slab, as shown in the perspective view of FIG. 5, a wire rod is bent in a wave pattern at a constant pitch (for example, 200 mm) to form a lattice streak 91. The upper bent portion 92 of the lattice muscle 91 is welded so as to sandwich one upper chord muscle 93, and the lower chord muscle 94 is welded to the lower portion of each of the two lattice muscles 91 to form the self-standing truss 90.

After cutting the self-supporting truss 90 into a certain length, the side view of FIG. 6 (a) and FIG. 6 (b).
As shown in the front view of Fig. 1, an iron plate with parallel groove shapes such as deck plate, keystone plate, rib plate, etc.
Placed on 98, the lower bending portion 95 of the lattice muscle 91 is welded to the iron plate 98 to make the structural material 9, and the structural material 9 is bridged between the lateral beams, and the iron plate 98 is used as a discarding form for concrete. The construction method of placing is practiced conventionally. As shown in the front views of FIGS. 6B and 6C, the lower chord muscle 94 may be welded inside or outside the two lattice muscles 91.

According to this construction method, since it is possible to support the temporary load of concrete cast by the self-supporting truss 90, a supporting member for supporting the formwork from below is unnecessary, and therefore concrete The work of dismantling the formwork after placing is unnecessary. Further, after the concrete is hardened, the self-supporting truss 90 serves as the main bar of the reinforced concrete.

In a conventional truss manufacturing apparatus for manufacturing a self-supporting truss, one upper chord muscle 93 and two lower chord muscles 94 are supplied and arranged in a triangular shape while bending a wire material in a wave shape at a constant pitch. , The upper bent part of the lattice muscle 91 bent in a wave shape
The self-standing truss 90 is manufactured by welding 92 to the upper chord muscle 93 and the lower part of the lattice muscle 91 to the lower chord muscle 94.

Then, the manufactured self-supporting truss 90 is cut into a certain length, and then placed on an iron plate 98 having parallel groove shapes, and the lower bent portion 95 of the lattice muscle 91 is attached to the iron plate 98. The structural material 9 is made by welding to the upper surface.

In order to directly support the self-supporting truss 90 by the horizontal beam 7 when the end of the structural member 9 is placed on the horizontal beam 7, the front view of FIG. 7A and the FIG. 7B. ), The self-supporting truss 90 is cut at a position corresponding to the upper bending portion 92 of the lattice muscle 91, and the first reinforcing bar 97 is welded horizontally between the two protruding lower chordal muscles 94. And the upper chord
A second reinforcing bar 96 is vertically welded between the end of 93 and the center of the first reinforcing bar 97 to form the end fixing member 8.

The lower end portion of the second reinforcing bar 96 is abutted on the upper surface of the iron plate 98 placed on the horizontal beam 7, or according to the shape of the horizontal beam 7, as shown in the side view of FIG. It may be bent in a crank shape.

When concrete is cast using such a structural material 9, the self-weight of the structural material 9 and the temporary weight of the cast concrete are transferred via the end fixing member 8.
The self-supporting truss 90 can be supported by the cross beam 7.

[0010]

In the conventional truss manufacturing apparatus, since the bending pitch of the lattice reinforcement 91 that is continuously bent is constant, the manufactured self-supporting truss 90 is adjusted to the span of the cross beam 7. When cut to a desired length, it is uncertain which position in the repeated pitch the cutting position of the lattice muscle 91 hits, and the cutting position does not always reach the upper bent portion 92 of the lattice muscle 91.

Therefore, the self-supporting truss 90 is attached to the lattice muscle 91.
When cut at a position corresponding to the upper bent portion 92, the length of the cut self-supporting truss 90 is limited to an integral multiple of one pitch of the lattice muscle 91, and does not necessarily match the span of the cross beam 7.
Further, when the self-supporting truss 90 is cut in accordance with the span of the cross beam 7, the cutting position does not always coincide with the position where the lattice muscle 91 hits the upper bent portion 92.

Therefore, the lattice bending apparatus of the present invention is configured so that the pitch of the lattice muscles 91 to be manufactured can be changed, and an integer multiple of the pitch of the lattice muscles 91 is matched to a desired size. It was designed to produce muscle.

[0013]

In the lattice muscle bending apparatus of the present invention, one upper chord muscle and two lower chord muscles are arranged in a triangular shape, and the above-mentioned bending is performed on the upper bending portion of the lattice muscle. This is a lattice bending device that welds the upper chord muscles and welds the lower chords below the lattices to form a self-standing truss. Movable chuck, a stationary chuck provided on a base that holds and holds the lower bent portion of the bent wire rod, and moves in the same direction at approximately half the speed of the movable chuck in conjunction with the movable chuck. However, it is provided with an upper bent portion forming member which is always located substantially in the center of the movable chuck and the stationary chuck and which presses the wire rod in a direction intersecting with the wire rod by a bending head to form an upper bent portion. .

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in the side view of FIG. 1, a lattice bending apparatus for a truss manufacturing apparatus according to the present invention draws out a coiled wire and passes it between a number of rolls. However, it is composed of a straightening device (not shown) for straightening it straight and a bending device B for intermittently pulling out the straightened wire rod by a constant length and bending it in a wavy pattern at a constant pitch. .

The straightening device is a well-known device that has been used in the past, and includes rolls arranged in a zigzag pattern on a horizontal plane and rolls arranged in a zigzag pattern on a vertical surface. By passing the wire between them, the wire rod which is wound into a coil and has a curl is straightened.

As shown in the side view of FIG. 1 and the principle view of FIG. 2, the folding device B includes a feed base 1 which moves along a rail 1a on a base A, a screw rod 13a and a screw 13b. Servo motor 13 for driving the feed base 1, a movable chuck 11 provided on the feed base 1 and driven by a hydraulic device 12, and a base for holding and holding the lower bent portion 95 of the bent wire rod 6. The stationary chuck 21 provided in A and the movable chuck 11 move in the same direction at half the speed of the movable chuck 11 in conjunction with each other, and always move the movable chuck 11 and the stationary chuck 21.
And the upper bent portion forming member 3 located substantially at the center of the.

The feed base 1 and the upper bent portion forming member 3
Is mechanically coupled by an interlocking mechanism such as a pantograph mechanism, or a servo motor 35 for driving the upper bending portion forming member 3 is provided in addition to the servo motor 13 for driving the feed base 1, and both servo motors 13, 35 are provided. May be electrically coupled by computer control to move the upper bent portion forming member 3 in the same direction at half the speed of the feed table 1.

The moving chuck 11 grips the wire rod 6 to move forward when the feed table 1 moves forward, and releases the wire rod 6 when the feed table 1 moves backward to move backward. A first encoder 14 is provided to detect the moving distance of the moving chuck 11 provided on the feed base 1.

The upper bent portion forming member 3 is attached to the rod 31 that moves in the vertical direction and the rod 31 so as to project from the rod 31 in the horizontal direction. The upper bent portion forming member 3 pushes up the central portion of the wire 6 to form an upper bent portion 92. It is composed of a head 32 and a servo motor 33 that drives the rod 31 in the vertical direction.
A second encoder 34 is provided to detect the rising distance of the bending head 32.

The first and second encoders 14,
Servo motor that drives the feed base 1 based on the output of 34
Servo motor 33 that drives 13 and rod 31 vertically
And a control device including a computer for controlling opening and closing of the movable chuck 11 and the stationary chuck 21.

Next, the process of bending the wire rod straightened by the lattice-bending apparatus having the above-mentioned structure to form lattice lines will be described.

In the computer of the control device, the wire material,
The processing conditions such as the wire diameter, the finished pitch P of the lattice line, the finished height H of the lattice line, and the curvature of the bent portion are input. The processing conditions are set in advance so that the amount of spring back restored by elastic deformation when the constraint during bending is released.

As shown in FIG. 2 (a), the wire rod 6 is inserted into the movable chuck 11 in the released state, and the stationary chuck 21 presses and fixes the tip end of the wire rod 6, and then the movable chuck 11 is released. Then, the feed table 1 is moved and stopped at a position separated from the stationary chuck 21 by the distance T, and the wire rod 6 is gripped by the moving chuck 11. This distance T is the length T of the wire rod 6 which corresponds to a finished dimension obtained by bending the wire rod 6 for one pitch.

As shown in FIG. 2B, the servo motor 33
Drive the rod 31 in the vertical direction by the bending head 32 to push up the central portion of the wire 6 to a set height, and the servo motor 13 advances the moving chuck 11 provided on the feed table 1.

At this time, the bending head 32 is also moved by the moving chuck 11.
Since it moves forward at half the speed, the portion of the wire rod pushed up by the bending head 32 always hits the substantially central portion of the moving chuck 11 and the stationary chuck 21.

As shown in FIG. 2C, the stationary chuck 21
With the lower bent portion 95 already bent by being pressed and fixed, the bending head 32 is lowered to release the movable chuck 11, and then the movable chuck 11 is retracted together with the feed base 1, and the finished dimension is bent. Is the sum of the length T of the wire 6 corresponding to one pitch and the length of one pitch P (T +
Distance (T + P) from the stationary chuck 21 so that
Stop at a distance of only. At this time, the bending head 32 also interlocks and retreats at a half speed.

At the stop position of the stationary chuck 21,
The wire rod 6 is gripped by the moving chuck 11 and the stationary chuck 21 is released. Then, as shown in FIG. 2D, when the feed table 1 is advanced by a distance of one pitch P, the stationary chuck 21 is operated to fix the lower bent portion 95 which is already bent by half. To do.

Then, as shown in FIG. 2 (a), the movable chuck 11 provided on the feed table 1 is moved forward and the bending head 32 is raised to perform bending for the next one pitch. By repeating such a series of operations, the wire rod is bent into a lattice line having a desired pitch and a desired height.

When raising the bending head 32 at a constant speed,
As shown in the control pattern diagram of FIG. 3A, the relationship between the constant speed rising distance of the bending head 32 and the forward moving distance of the moving chuck 11 is as shown in the control pattern diagram of FIG.
The servo motor 13 for driving the feed table 1 is controlled so that the moving chuck 11 is advanced at a low speed and the moving chuck 11 is advanced at a high speed at the end of the ascent of the bending head 32.

When the movable chuck 11 provided on the feed table 1 is advanced at a constant speed, the relationship between the constant speed advance distance of the movable chuck 11 and the ascending distance of the bending head 32 is shown in the control pattern of FIG. 3 (b). As shown in the drawing, the servo that drives the rod 31 of the bending head 32 so as to raise the bending head 32 at a high speed in the initial stage of the advance of the moving chuck 11 and raise the bending head 32 at a low rate at the end of the advance of the moving chuck 11. Control the motor 33.

Such a speed control pattern varies depending on the material of the wire material, the wire diameter, the finished pitch P, the finished height, the curvature of the bent portion (the shape of the tip of the chuck, the shape of the tip of the bending head), and is calculated by calculation. However, since it does not match the reality, a correction value is obtained in advance by experiment, this correction value is stored in the memory of the computer of the control device, and the rod of the bending head 32 is corrected while correcting the input processing conditions by the correction value. The servo motor 33 for driving 31 and the servo motor 13 for driving the feed base 1 are controlled.

In this bending process, by inputting the processing conditions such as the material of the wire rod, the wire diameter, the finished pitch P, the finished height, and the curvature of the bent portion into the computer of the control device, various wire rods 6 can be arranged at any pitch P. And it can be processed into the lattice muscle 91 of any height.

In the embodiment described above, 1
The bending of a wire rod has been described, but two movable chucks are provided on the feed base 1, two stationary chucks 21 are provided on the base A, and two bending heads 32 are provided symmetrically on both sides of the rod 31. Then, the two wires 6 can be bent at the same time.

Two lattice muscles 91 processed in this way
As shown in Fig. 6 (a) and front view (b), is one upper chord muscle 93 and two lower chord muscles 94 arranged in a triangular shape.
Each lattice muscle 91 along with, welded so that the upper chord muscle 93 is sandwiched by the upper bent portion 92 of the lattice muscle 91, and the lower part of the lattice muscle 91 is welded to the lower chord muscle 94 respectively to manufacture the self-supporting truss 90. Of.

The self-supporting truss 90 manufactured in this manner is placed on an iron plate 98 having a plurality of parallel groove shapes such as a deck plate, a keystone plate, and a rib plate, and 2
The lower bent portions 95 of the lattice muscles 91 of the book are welded to the iron plate 98 to make the structural member 9 of the floor slab. Then, the structural material 9 is bridged between the lateral beams, and the concrete is placed using the iron plate 98 as a discard form to construct a floor slab.

(Other Embodiments) As an iron plate for welding the self-supporting truss 90 cut into a certain length, instead of the iron plate 98 having the groove shape, as shown in the sectional view of FIG. 4 (a). The ridge 98b formed by bending an iron plate into a V shape can be further crushed to form a thin ridge 98a as shown in the sectional view of FIG. 4B. Since this iron plate 99 has a flat lower surface, it is suitable for finishing a flat ceiling surface.

When welding the self-supporting truss 90 to the iron plate 99, the self-supporting truss 90 is placed on the iron plate 99 as shown in the sectional view of FIG. The structural member 9 may be made by welding the bent portion 95 to the side surface of the ridge 98a of the iron plate 99.

[0038]

As is apparent from the description based on the above-described embodiments, according to the lattice-bending apparatus of the present invention, the wire material, the wire diameter, the finishing pitch P, the finishing height, and the bending portion By inputting machining conditions such as curvature into the computer of the control device, various wire rods can be bent into a lattice line having an arbitrary pitch P and an arbitrary height. Therefore, an integral multiple of the lattice line pitch P is applied. It is possible to make lattice lines that match the span between horizontal beams on site.

Therefore, since the end portion of the self-supporting truss composed of this lattice can be treated appropriately, the self-weight of the structural material and the temporary weight of the cast concrete are applied to the end portion of the self-supporting truss. It can be supported in a stable state.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a lattice bending device according to the present invention,

FIG. 2 is a principle diagram showing an enlarged main part of the apparatus shown in FIG.

3 is a control pattern diagram showing a relationship between a moving distance of a moving chuck and a rising distance of a bending head in the apparatus shown in FIG.

FIG. 4 is a cross-sectional view showing another example of a structural material to which a self-supporting truss having lattice lines manufactured by the apparatus of the present invention is applied.

FIG. 5 is a perspective view showing an example of a conventional self-supporting truss,

FIG. 6 is a side view (a) and a front view (b) (c) showing an example of a structural member obtained by welding a conventional self-supporting truss having lattice reinforcements to an iron plate;

FIG. 7 is a front view (a) and side views (b) and (c) showing an example of an end portion of a structural material of a conventional floor slab.

[Explanation of symbols]

A base B folding device 1 Feeding stand 3 Upper bending part forming member 6 wire rod 7 Horizontal beams 8 end fixing member 9 structural materials 11 Moving chuck 13, 33 Servo motor 14, 34 encoder 21 stationary chuck 31 rod 32 bending head 90 freestanding truss 91 Lattice muscle 92 Upper bend 93 Upper Chord 94 Lower Chord 95 Lower bend 98, 99 Groove-shaped iron plate

Claims (3)

[Claims] 1. An upper chord muscle and two lower chord muscles are arranged in a triangular shape, the upper chord muscle is welded to the upper bending portion of a wavy flexed lattice muscle, and the lower chord is formed below the lattice muscle. A lattice bending device for welding self-supporting trusses by welding muscles, including a feed table that moves along a base, a moving chuck provided on the feed table, and a lower bending of a bent wire rod. The stationary chuck provided on the base for holding and holding the part moves in the same direction at a speed almost half that of the moving chuck in conjunction with the moving chuck, and is always at the center of the moving chuck and the stationary chuck. An upper bending portion forming member that is positioned and presses the wire rod by a bending head in a direction intersecting with the wire rod to form an upper bending portion. 2. The moving speed of the upper bending portion forming member is controlled to be slow at the initial stage of movement of the moving chuck moving at a constant speed, and to be increased at the final stage of moving of the moving chuck. Claim 1
Lattice muscle bending apparatus described in. 3. The moving speed of the moving chuck is controlled to be high in the initial stage of the movement of the upper bending portion forming member which moves at a constant speed, and the moving speed of the moving chuck is controlled to be slow at the end of movement of the upper bending portion forming member. Claim 1
Lattice muscle bending apparatus described in.