JP4018052B2 - Welding apparatus and welding method - Google Patents

Description

The present invention relates to a welding apparatus and a welding method for joining a reinforcing plate such as a shear reinforcement connecting between main reinforcing bars or distribution bars and a locking plate made of flat steel in order to enhance the earthquake resistance performance of a structure, for example.

  Reinforcing bars placed inside a reinforced concrete structure, etc. are placed in the direction perpendicular to the main bars that bear the axial force or bending moment, to ensure the position of the main bars and to transmit stress in the right-angle direction. It consists of a strength reinforcement and a shear reinforcement that connects the main and distribution muscles. As this shear reinforcement bar, various shear reinforcement bars are disclosed in, for example, Patent Document 1 and Patent Document 2. The shear reinforcing bar shown in Patent Document 1 has a semi-circular hook part hooked to the main bar or the like at one end part, and a steel bar having a thread part at the other end part, and is detachable from the thread part of the steel bar. A hook is attached to one of the two main bars facing each other, a steel rod is placed between the main bars, and the locking plate is fixed to the threaded part of the steel bar with a nut and sheared. Reinforcing bars are attached between the main bars. Also disclosed is a shear reinforced steel in which a threaded portion is provided in place of the hook portion, and a locking plate is fixed to the threaded portions at both ends of the steel rod with nuts.

  In addition, the shear reinforcement shown in Patent Document 2 is a hot installation by heating the tip of a steel bar by, for example, high-frequency induction heating instead of a locking plate that is fixed to the screw portions at both ends of the steel bar with nuts. The locking portion is formed by compressing in the axial direction and expanding the outer diameter.

  As shown in Patent Document 1, when the shear reinforcement bars are attached between the main bars and the like, if the locking plate is fixed to the steel bar with a nut, the fixing operation of the locking plate is not easy, and much work time is required. The construction efficiency of the site is reduced.

  In addition, as shown in Patent Document 2, when the tip of a steel bar is heated by high-frequency guidance heating and hot upsetting is performed to form a locking portion, a large number of shear reinforcement bars are created in a short time It is difficult to do so, and the unit price of the shear reinforcement is high.

In order to cope with these disadvantages, the steel bar and the locking plate can be joined together by friction joining. When a rectangular plate is used as the locking plate, the long side of the rectangular plate needs to be aligned with the semicircular hook portion, and in the friction welding performed by rotating the locking plate at a high speed, the hook portion and the locking plate It was not easy to match the long sides of.
JP-A-10-196120 JP 2000-257209 A

An object of the present invention is to provide a welding apparatus and a welding method that can improve such disadvantages and can efficiently join a steel bar such as a reinforcing bar and a locking plate made of flat steel.

The welding apparatus according to the present invention includes a base, a pair of fixing bases provided at the center in the longitudinal direction of the base, a pair of clamping means provided on the outer side of the base in the longitudinal direction from each fixing base, The pair of fixing bases are provided at a joint plate holding portion for holding a plate to be joined at the upper portion of the side surface and an upper portion in the vicinity of the joint plate holding portion, respectively . A plurality of joining plate supply means for supplying the joined plates to the joining plate holding section, the joining plate supply means having a supply port at a lower end portion on the joining plate holding section side, and a plurality of joining plates. A holding part that is stacked and held, and a delivery cylinder that sends out the lowermost joining plate among the joining plates held by the holding part to the joining plate holding part, wherein the clamping means includes a fixed clamp, a movable clamp, and a cylinder. And the fixed clamp is A power supply block is attached to the surface via an insulating member, and has a plurality of steel bar holding portions that hold the steel bar at a position facing the joint plate holding portion of the fixed base. The movable clamp has a power supply block on the lower surface. And is provided with a plurality of bar guides at positions facing the bar holding part of the fixed clamp, and is moved up and down by a clamp cylinder provided in the cylinder part. It has a cylinder and two guide shafts, and in the upsetting cylinder, a piston rod is connected to the clamping means, and the clamping means is moved to the fixing base side and the bar steel clamped by the clamping means is held on the fixing base. The two guide shafts hold the pair of clamp means slidably in the longitudinal direction of the base, and the welding power source Characterized in that it is connected between the fixing base and the fixed clamp flop means.

The welding method of the present invention is a welding method using the welding apparatus, wherein a plurality of steel bars clamped by the clamping means are moved from both sides of the pair of fixing bases, and the joining plate supply means of the fixing bases The steel bars and the plate to be joined are joined by flash welding in contact with the plates to be joined that are sequentially supplied from above and held by the joining plate holding part.

  In the welding apparatus according to the present invention, a pair of clamp means are arranged to face each other with a pair of fixing bases provided at the center in the longitudinal direction of the base, and a pair of steel bars clamped by the clamp means are fixed. Since the pressure applied to the pair of fixed bases cancels each other by press-contacting the joined plate held by the base from both sides, there is no need to make the fixed base large and strong, and the welding equipment is small. Can be

  Further, by clamping a plurality of steel bars with the clamping means and holding the plurality of plates to be joined with the fixing base, the plurality of steel bars can be joined to the plates to be joined at the same time, and the joining efficiency can be improved.

  Furthermore, by providing the fixed base with the joining plate supplying means for supplying the joining plate to the joining plate holding part, the joining plate can be automatically supplied, and the joining efficiency can be further improved.

  In addition, a plurality of steel bars clamped by the clamping means are moved from both sides of a pair of fixed bases and brought into contact with the target plates held by the fixing plate holding parts of the fixed bases, and the steel bars and the target plates are joined by flash welding. By doing, a some steel bar and a to-be-joined board can be joined efficiently in a short time.

  Furthermore, the length of the steel bar hook plate having a semicircular hook portion on the side opposite to the joint end and the bar steel lock plate having an elliptical or rectangular flat steel plate on the side opposite to the joint end. The steel bar is clamped by the clamping means so that the direction coincides with the longitudinal direction of the board to be joined held by the joining plate holding part of the fixing base, and the steel bar clamped by the clamping means is held by the joining board holding part of the fixing base. By joining to a plate, a shear reinforcing bar having a stable shape can be produced.

  1 and 2 are configuration diagrams of a welding apparatus according to the present invention. FIG. 1 is a side view and FIG. 2 is a plan view. As shown in the figure, the welding apparatus 1 is provided on the outer side of the base 2 in the longitudinal direction of the base 2, a pair of fixed bases 3 provided at the center of the base 2 in the longitudinal direction, and the fixed bases 3. In addition, as shown in FIG. 3, a pair of clamping means 4 and upsetting means 5 connected to each clamping means 4 are joined to a steel bar 6 such as a reinforcing bar and a locking plate 7 made of flat steel. . Each of the pair of fixing bases 3 is provided with a plurality of, for example, two sets of locking plate holding portions 8 for holding the locking plate 7 on the upper side surface on the clamping means 4 side. Locking plate supply means 9 is provided. As shown in the perspective view of FIG. 4, the pair of fixing bases 3 are fixed to the upper surface of the base 2 via the insulating member 11 with the insulating member 10 sandwiched therebetween. The locking plate supply means 9 has a supply port at the lower end portion on the locking plate holding portion 8 side, a holding portion 12 that stacks and holds a plurality of locking plates 7, and a locking plate held by the holding portion 12 7 has a delivery cylinder 13 for feeding the lowermost locking plate 7 to the locking plate holding portion 8.

  The clamp means 4 has a fixed clamp 14, a movable clamp 15 and a cylinder part 16. As shown in FIG. 4, the fixed clamp 14 has a supply block 17 attached to the upper surface via an insulating member 18, and a steel bar holding portion that holds the steel bar 6 at a position facing the locking plate holding portion 8 of the fixing base 3. A plurality of groups 19 are provided, for example, two groups. A lower part of the connecting member 20 having a concave shape is fixed to a side surface of the fixing clamp 14 opposite to the fixing base 3, and a cylinder holding block 22 having a clamp cylinder 21 of the cylinder portion 16 is attached to the upper part of the connecting member 20. ing. The movable clamp 15 has a power feed block 23 attached to its lower surface via an insulating member, and has a bar guide 24 at a position facing the bar holding part 19 of the fixed clamp 14 as shown in the sectional view of FIG. The piston rod of the clamp cylinder 21 is connected to the center of the upper surface of the movable clamp 15, and two guide rods 25 are provided across the piston rod connecting portion. The guide rod 25 is slidable in a guide hole 26 penetrating in the vertical direction of the cylinder holding block 22 and regulates the position when the movable clamp 15 moves in the vertical direction.

  The upsetting means 5 has a upsetting cylinder 27 and two guide shafts 28. The upsetting cylinder 27 is attached to a lower end portion of a support member 29 fixed to both ends of the base 2 in the longitudinal direction, and a piston rod 30 is connected to a lower portion of the connecting member 20 fixed to the fixed clamp 14. The two guide shafts 28 pass through guide holes 31 provided in the cylinder holding block 22 of the clamping means 4, and both ends are fixed to the upper part of the support member 29.

  Two pairs of welding power sources 32 are provided on both sides of the base 2, and the two pairs of welding power sources 32 are connected to one fixed base 3 and the fixed clamp 14, respectively.

Operation | movement when joining the steel bar 6 and the latching plate 7 with this welding apparatus 1 is demonstrated. First, a plurality of locking plates 7 are set on the holding portions 12 of the locking plate supply means 9, and the locking plates 7 set on the holding portions 12 by driving the delivery cylinder 13 are attached to the respective locking plate holding portions 8. Send out one sheet. In this state, the steel bars 6 are set one by one in the steel bar holding portions 19 of the fixed clamps 14 provided on the clamp means 4, and the four steel bars 6 are held on the upper surfaces of the two sets of fixed clamps 14. Thereafter, the clamp cylinder 21 is driven to lower the movable clamp 15, and the bar 6 held by the fixed clamp 14 is pressed by the bar guide 24 and the bar 6 is clamped by the fixed clamp 14 and the movable clamp 15. After confirming that the steel bar 6 has been clamped, the clamp cylinder 27 of the set-up means 5 is driven to advance the clamp means 4 and the tip of the clamped steel bar 6 is held by the locking plate holding part 8. Lightly contact the stop plate 7. In this state, a voltage is applied from a pair of welding power sources 32 provided on both sides of the base 2 to the fixing base 3 and the fixing clamp 14 provided with the center of the base 2 interposed therebetween, so that the tip of the bar 6 and the locking plate A large current is supplied to the connection part 7 to heat it intensively. By this heating, the contact portion melts and scatters as a spark, and when the contact is broken, the clamping means 4 is further advanced, and contact and spark scatter are repeated between the tip of the steel bar 6 and the locking plate 7. To heat the contact. When the temperature of the contact portion between the steel bar 6 and the locking plate 7 reaches an appropriate temperature due to this heating, the clamp means 4 is rapidly advanced by the swaging cylinder 27, and the contact portion between the steel bar 6 and the locking plate 7 is suddenly moved forward. Apply pressure to and press contact with upsetting.

  When this pressure contact is made, pressure is applied from both sides of the pair of fixed bases 3 and the pressures applied to the pair of fixed bases 3 cancel each other, so there is no need to make the fixed bases 3 large and strong. Pressurization can be performed, and the welding apparatus 1 can be reduced in size. Further, when the steel bar 6 is joined to the locking plate 7, a voltage is applied to the fixed base 3 and the fixed clamp 14 from a pair of welding power sources 32 provided on both sides of the base 2. A balanced current can flow between the steel bar 6 and the two locking plates 7 held by the two locking plate holding portions 8 of the fixed base 3. Can be stably joined.

  After the steel bar 6 and the locking plate 7 are press-contacted, the clamping of the steel bar 6 by the clamping means 4 is released, the joined steel bar 6 and the locking board 7 are removed, and the clamping means 4 is moved backward by the swaging cylinder 27, The steel bar 6 and the locking plate 7 are joined, and the above operation is repeated.

  In this way, for example, four steel bars 6 can be joined to the locking plate 7 in one joining step, and the joining efficiency can be improved. Further, as shown in FIG. 3B, a steel bar 6 having a semicircular hook portion 33 on the side opposite to the joining end is joined to the locking plate 7, and as shown in FIG. When producing the shear reinforcement bars 42 connecting the force bars 41, the hook bar 33 of the steel bar 6 is made to coincide with the longitudinal direction of the locking plate 7 held by the locking plate holding part 8, and the bar steel 6 is clamped 4. By clamping with, the locking plate 7 and the hook portion 33 of the steel bar 6 can be matched and joined, and the shear reinforcing bar 42 having a stable shape can be produced.

  Further, as shown in FIG. 3 (c), a steel bar 6 having a locking plate 71 made of a rectangular flat steel on the opposite side to the joining end, or on the opposite side to the joining end as shown in FIG. 3 (d). Even when the steel bar 6 having the locking plate 72 made of an elliptical flat steel is joined to the locking plate 7, the locking plate 7 in which the longitudinal direction of the locking plates 71 and 72 is held by the locking plate holding portion 8. By clamping the steel bar 6 with the clamping means 4 so as to coincide with the longitudinal direction of the steel plate, the mounting direction of the locking plate 7 and the locking plates 71 and 72 attached to the steel bar 6 can be reliably matched and joined.

It is a side view which shows the structure of the welding apparatus of this invention. It is a top view which shows the structure of a welding apparatus. It is a perspective view which shows the joining state of a steel bar and a locking plate. It is a fragmentary perspective view which shows the structure of a fixed base and a fixed clamp. It is side surface sectional drawing which shows the structure of a clamp means. It is a perspective view which shows the state which attached the shear reinforcement.

Explanation of symbols

1; welding device, 2; base, 3; fixing base, 4; clamping means, 5;
6; Steel bar, 7; Locking plate, 8; Locking plate holding part, 9; Locking plate supply means,
10, 11; insulating member, 12; holding portion, 13; delivery cylinder, 14; fixed clamp,
15; movable clamp, 16; cylinder part, 17; power supply block, 18; insulating member,
19; Steel bar holding part, 20; Connecting member, 21; Clamp cylinder,
22; Cylinder holding block, 23; Feeding block, 24; Bar guide part,
25; guide rod, 27: upsetting cylinder, 28; guide shaft, 29; support member,
32; welding power source, 40; main bar, 41; distribution bar, 42; shear reinforcement bar.

Claims (2)

A base, a pair of fixing bases provided at the center in the longitudinal direction of the base, a pair of clamping means provided on the outer side of the base in the longitudinal direction from each fixing base, and a slide connected to each clamping means And a welding power source,
Each of the pair of fixing bases is provided with a joining plate holding portion for holding a joined plate at an upper portion of the side surface, and a joining plate supply for supplying the joined plate to the joining plate holding portion. The joining plate supplying means has a supply port at a lower end portion on the joining plate holding portion side, a holding portion that stacks and holds the plurality of joining plates, and a joining plate held by the holding portion. A lowermost-stage joining plate has a delivery cylinder that sends out the joining plate holding part to the joining plate holding part,
The clamp means includes a fixed clamp, a movable clamp, and a cylinder portion. The fixed clamp has a power feeding block attached to an upper surface via an insulating member, and a bar steel is disposed at a position facing the joining plate holding portion of the fixed base. The movable clamp has a plurality of bar steel holding portions, the power supply block is attached to the lower surface via an insulating member, the movable clamp has a plurality of steel bar guide portions at positions facing the bar holding portion of the fixed clamp, It is moved up and down by the clamp cylinder provided in the cylinder part,
The upsetting means has a upsetting cylinder and two guide shafts, and a piston rod is connected to the clamping means in the upsetting cylinder, and the clamping means is moved to the fixed base side and clamped by the clamping means. And the two guide shafts hold the pair of clamping means slidably in the longitudinal direction of the base, and
The welding apparatus, wherein the welding power source is connected between a fixed clamp of the clamp means and the fixed base. 2. A welding method using the welding apparatus according to claim 1, wherein a plurality of steel bars clamped by the clamping means are sequentially supplied from the joining plate supply means of the fixed base by moving from both sides of the pair of fixed bases. A welding method comprising: joining a steel bar and a plate to be joined by flash welding in contact with a plate to be joined held by a joining plate holding portion.

Images