JPH0671679B2 - Backing member for welded joint of rebar - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention, when the reinforcing bars and the reinforcing bars are welded to each other, by fitting the joints of the reinforcing bars to be joined, the molten metal of the reinforcing bars is The present invention relates to a backing member in which desired joint welding is performed without causing involuntary flow or melting.

<< Prior Art >> As is known, there are methods such as gas pressure welding, welding joints and mechanical joints as means for joining reinforcing bars.

As for the above-mentioned welded joint construction method, whether by manual welding or semi-automatic welding, as shown in FIG. 4, the outer periphery of the joints a ′, a ′, which are the end portions of the reinforcing bars a, a, are made of steel or copper material and are short. Split groove b
Is surrounded by a backing member c having a vertical pipe shape, and the joint groove portions d, d of the reinforcing bars a, a are separated by a predetermined distance e.
With a distance of (root interval), it is welded and fixed to the backing member c by the temporary fixing points f, f, and the welding rod h is inserted from the notch opening g opened in the backing member c. The two reinforcing bars a and a are welded together.

As a result, the molten metal of the rebars a and a is completed as welding without flowing down as described above. However, when the backing member c is used, the rebar a has a pipe shape as described above. , a, when one of the reinforcing bars is fitted in advance, then the other reinforcing bar is attached to the backing member c.
In addition to the inconvenience of operation in which the backing member c is made of steel, the reinforcing bars a, a
After the welding of the joint is completed, the reinforcing bar and the backing member are welded to each other by welding, so that it becomes difficult to remove the both, and therefore the visual inspection of the joint becomes impossible.

On the other hand, if a copper material is used for the backing member, it is possible to remove the copper material, which is a copper plate, after completion of welding, so that the appearance of the joint part can be inspected, but the backing member is severely damaged, so it is expensive. There is a practical problem that copper consumption is large.

In addition, the fact that the backing member cannot be removed as described above means that only the joint portion has a large diameter, the distance between the reinforcing bars is not uniform, and uniform bar arrangement cannot be obtained. Even during the filling work, it is difficult to guarantee the complete filling.

Therefore, the backing member has already been destroyed by breaking the preconceived idea that the backing member was made of metal, and after the completion of the welded joint, the backing member was crushed, and ceramics was selected as the material so that it could be removed. This enables the joint joint to be visually inspected directly for reliable inspection, and it can be provided at a lower cost than steel, copper, etc., and the backing member of the joint joint can prevent the large-diameter portion from remaining. In order to enable a bar arrangement in which the intervals between the reinforcing bars are equalized, the ones shown in FIGS. 5 and 6 have also been proposed.

That is, in the backing member i shown in FIG. 5, a ceramic main body j is bent in a substantially horseshoe-shaped cross section, and a narrow opening 1 is opened between its free edges k, k. The joint groove portions d, d of a, a are fitted.

However, since the narrow opening 1 is provided as described above, the backing member i must be fitted to the reinforcing bar a in advance before the reinforcing bars a and a are assembled. Therefore, the assembling of the reinforcing bars a and a is performed. At this time, the backing member i may be damaged.

Therefore, in order to solve the above problems, a backing member m as shown in FIG. 6 may be used. In this case, the opening n between the free edges k ′, k ′ of the backing member a, a The diameter is larger than the diameter of the reinforcing bars a and a, so that even after the reinforcing bars a and a are assembled, the reinforcing bars a and a can be fitted from the outside to a required position, and the reinforcing bars a and a can be bound to the reinforcing bars a and a by a binding wire or the like not shown.

However, when the opening n is increased as described above, the reinforcing bar a,
When welding the joint groove portions d, d of a, there is a defect that the weld metal overflowing from the free edges k, k drips in a molten state.

<Problems to be Solved by the Invention> The present application has been studied in view of the above-described defects. Instead of forming the backing member by one member, first, a pair of ceramic half halves can be opened and closed. By attaching with a hinged member, even after the assembling of the reinforcing bar, it can be covered from the outside in an open state, and by closing this, it can be freely fitted into a required part of the reinforcing bar. By making the opening in the fitted state sufficiently small, not only the melt of the deposited metal does not drip, but also in the narrow opening of the backing member, there is a slight separation on one side in the longitudinal direction. By arranging the parts in series, it is possible to completely prevent the molten metal from dripping from the location, and especially in the case of vertical streaks, the external flow of the molten metal that tends to flow downward. Lose out,
The purpose is to prevent the conventional drooping phenomenon more effectively.

<Means for Solving the Problems> In order to achieve the above object, the present application is composed of a pair of ceramic half-split bodies and a hinge member, and the half-split bodies are an inner peripheral curved surface, an outer peripheral curved surface, and an inner outer surface. An end edge, is formed to have a required length in a circular arc cross section, and the hinge member is provided so as to straddle a pair of half halves, and the half halves have a cross section 3 of a character shape. From the open state, the inner edges collide with each other to form a narrow opening on one side in the longitudinal direction between the outer edges, and on the other side, a small cutout smaller than the narrow opening. An object of the present invention is to provide a backing member for a welded joint of a reinforcing bar, which is hinged so as to be rotatable up to a closed state of a formed horseshoe shape.

<Operation> When the backing member according to the present invention is opened by the hinged member, the whole has a lateral cross-section 3 shape, so that the outer edge portions of the half-divided body are largely separated from each other. If you push the side of the assembled rebars to be joined from the side, and then make both halves closed by the hinged member, it will be in a state of being fitted on the rebars, at this time It has a horseshoe shape in cross section (a shape in which a small arcuate part of the entire circumference is cut off), and a relatively narrow (smaller than the diameter of the reinforcing bar) opening is formed between the outer edges of the half body. .

Therefore, it is possible to weld the joint groove portion of the reinforcing bar by utilizing the narrow opening portion. At this time, if the width of both halves is set to be appropriately long, it is possible to prevent the deposited metal from dropping. Since the half-split body is made of ceramics, its appearance can be inspected by welding by crushing and removing it.

Then, when using, if the narrow opening is placed on the upper side and the minute separation part of the connection is placed on the lower side in such a manner that it is on the lower side, even if the molten metal melted during welding flows downwards. , The outflow from the minute cutoff part is blocked, therefore
Even when it is used for the vertical streaks, the drooping can be effectively prevented.

<< Embodiment >> The backing member according to the present invention will be described with reference to the embodiment shown in FIGS. 1 and 2. A pair of half-divided bodies 1 and 1 formed so as to be crushable by ceramics and It comprises a hinged member 2 which is hinged so that it can be opened and closed.

The halves 1 and 1 are formed in the same shape and have an arcuate cross section and are adjusted to a predetermined length. In the figure, 1a and 1a are inner curved surfaces, 1b and 1b are outer curved surfaces, and 1c and 1c are inner ends. Edges, 1d, 1d indicate outer edges.

Next, as the hinged member 2, as shown in FIG. 1 (b), a back tape 2a is attached to the pair of half-divided bodies 1, 1 while straddling the outer peripheral curved surfaces 1b, 1b thereof. And at this time,
As shown in FIG. 6C, it is desirable that the back tape 2a itself be provided with an adhesive layer 2b and formed of a heat resistant material.

Therefore, in the above-described embodiment, the cross section in the opened state is in the shape of the letter "3", and at this time, the inner edge 1c,
1c is in a separated state with a V-shaped gap, and in this state, the rebars a, a after assembly are covered with the backing member from the outside as shown in FIG. Then, if the inner peripheral curved surface 1a, 1a side is made to be close to the rebar a, a, the inner edges 1c, 1c collide with each other, and the two half-divided bodies 1, 1 have an arc-shaped cross section. The closed state of a substantially horseshoe shape is continuously provided, and the reinforcing bars a and a are fitted.

At this time, the backing member is arranged at a position that covers the joint opening tip portions d, d of the reinforcing bars a, a, and has a separation length smaller than the diameter of the reinforcing bars a, a between the outer end edges 1d, 1d. The narrow opening 3 is formed, and the backing member in this state is fixed to the reinforcing bars a, a by a known means, for example, a binding wire (not shown), and welding work of the joint groove parts d, d is performed. It will be.

Here, in the embodiment shown in FIG. 2, the hinged member 2 is formed by the back hinge metal fitting 2c instead of the back tape 2a.

This rear hinge metal fitting 2c includes a pair of half elastic bending pieces 2d, 2d.
At the base end thereof, which is pivotally attached by a pivoting pin 2e so as to be openable and closable, and at its free end side, there are engaging hooks 2f, 2f formed by being folded back inward. The elastic curved pieces 2d, 2d are brought into contact with the outer peripheral curved surfaces of the half-divided bodies 1, 1, and
By engaging the engaging hooks 2f, 2f with the outer end edges 1d, 1d of the half-split bodies 1, 1, the pivot pin 2e is arranged at a position corresponding to the inner end edges 1c, 1c, and From the closed state as shown, the outer edge 1
When the opening operation is performed so that the narrow opening 3 between d and 1d becomes large, the elastic shape of the half elastic bending pieces 2d and 2d is resisted and the three-shaped opening state as shown in FIG. 1 (a) is obtained. can do.

Further, as the hinged member 2, it is also possible to use not-shown pivots, which are simply bent in a horseshoe shape or the like, as shown in FIG. It is preferable to form a holding hook as shown in FIG.

According to the present invention, as described above, a pair of ceramic halves is used.
1, 1 and the hinged member 2, the narrow opening 3 is opened in the closed state as described above, and the welding operation is performed from here, but the narrow half is formed over the entire length of the half 1, 1. The narrow opening 3 is formed on one side, which is the upper side in the longitudinal direction, instead of being opened, but on the other side, it extends from the outer edge 1d, 1d in an arc shape. Curved arm 3a,
By forming 3a and bringing the tip end portions thereof close to each other so as to have a relatively small separation distance, the minute cutoff portions 3b are formed separately.

The above-mentioned backing member is preferably used especially when the reinforcing bars a, a are installed in the vertical direction, and is in the closed state as shown in FIG. 1, but of course the joint groove of the reinforcing bars a, a is used. Department
The d and d are provided in the narrow opening 3, and when the welding work is performed in this state, the molten weld metal flows downward, but at this time, the curve is curved. Arm
Since the slightly separated portion 3b is formed by 3a, 3a, the molten metal that has flowed down does not drip outside.

In Fig. 1, a 'and a'represent the ribs of the reinforcing bars a and a. However, when the diameter of the reinforcing bars a and a becomes large, the ribs a'and a'will also become considerably large. The gap 4 between the bodies 1 and 1 also becomes considerably large, and the amount of molten metal flowing down tends to increase, but
In such a case, the effect of preventing dripping becomes effective.

<Effects of the Invention> Since the present application is configured as described above, since the half body is made of ceramics, it can withstand high heat during welding and can be removed by crushing after welding is completed. It is possible to easily and surely check the appearance of the joints by visual inspection, etc., and the rebars thus joined will have uniform reinforcement without large-diameter portions, and the ceramic material will be inexpensive. Since it can be provided, wear due to crushing does not hinder practically.

Moreover, since the half-split body is pivotally attached by a hinged member so as to be openable and closable, it is not necessary to fit the reinforcing bar in advance.
The built-in reinforcing bar can be freely fitted later, and the narrow opening can be set to be sufficiently small, so that it is possible to prevent the risk of the molten metal being dripped during the welding operation.

Further, in the present invention, since the small opening is provided with a small cut-off portion adjacent to the closed state, the molten weld metal is also used when it is a vertical bar and has a large diameter. It is possible to effectively prevent the dripping of steel, and to obtain a joint welded portion of a reinforcing bar that is safe and has no waste and is desirable in terms of strength.

[Brief description of drawings]

1 (a), (b), and (c) are a perspective view, a side view, and a cross-sectional plan view, respectively, showing a usage state of the backing member according to the present invention, and FIG. FIG. 3 is a perspective view in which a part of the state is cut away, and FIGS. 3 (a) and 3 (b) are a side view and a right side end view, respectively, showing a conventional backing member in a use state and FIGS. 4 (a), (b) and (c). ) Is a side view of the known backing member in the same use state, a left side view of the same above, a plan view of the same above, and FIG. 1-Half-divided body 1a-Inner curved surface 1b-Outer curved surface 1c-Inner edge 1d-Outer edge 2-Hinging member 2a-Rear tape 2c-Rear hinge metal fitting 3 ... Narrow Opening 3b …… Slightly separated part a …… Reinforcing bar

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography Shou 57-152384 (JP, U) Seki 50-24713 (JP, U) Seki 58-36470 (JP, Y2)

Claims (1)

[Claims] 1. A pair of ceramic half-divided bodies and a hinge member, the half-divided bodies having an inner peripheral curved surface, an outer peripheral curved surface and inner and outer end edges, and having an arc-shaped cross section. The hinged member is formed to have a size of a required length, and the hinge members are provided so as to straddle a pair of half-split bodies, and the half-split bodies are abutted against each other from the open state of the cross-section 3 in the shape of a letter. A narrow opening is formed on one side in the longitudinal direction between the outer edges, and a small cutout smaller than the narrow opening is formed on the other side. A backing member for a welded joint of a reinforcing bar, which is hinged so as to be freely movable.