JPH0822462B2 - Welding method for piles with curved welding rods - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for welding and joining piles using a welding rod.

[Prior Art] A horizontal welding rod in which a core material is covered with a fusion material is known, and when welding a corner portion with this horizontal welding rod, the horizontal welding rod is covered with a refractory material such as ceramics. It was also known that in this way, the blowing direction of the arc and the outflow direction of the molten metal could be controlled.

[Problems to be Solved by the Invention] However, in the conventional welding method using a horizontal welding rod, a welding rod or a refractory material such as ceramics cannot be used unless it is placed on a horizontal surface, and a cylindrical pipe is used. It was impossible to weld things.

It is an object of the present invention to provide a method for welding steel plates at the end of a pile when constructing a pile using a horizontal welding rod.

[Means for Solving the Problems] The present invention relates to a steel plate 3 having a shape such that a steel plate of a pile end has a small diameter on the end side and forms a groove when the steel plates are stacked on each other.
When welding the pile 1 using the pile 1 in a state where the pile is vertically erected, an iron powder type curve welding in which the periphery is covered with the flux 6 at the groove portion formed between the steel plates 3 of the pile 1 A rod 5 is arranged, the curved welding rod 5 covered with the flux 6 is covered with an arc-shaped ceramic cover 7 divided into several pieces, and the ceramic cover 7 is covered with a heat-resistant adhesive or adhesive tape 8 to form the pile 1 After being fixed on the surface of the pile, the steel plates of the pile end are welded by the iron powder type curved welding rod 5 whose periphery is coated with the flux 6 as described above. It is a welding method.

As described above, in order to weld the steel plates of the pile end portion, which is the curved portion of the circular tubular shape, which is the object of the present invention, the iron powder type curved welding rod 5 whose periphery is coated with the flux 6 is used. Should be.

Further, as a steel plate of the pile end part, a pile 1 using a steel plate 3 having a small diameter on the end side and forming a groove when the steel plates are stacked on top of each other is a welding target, and the pile is in a vertically standing state. It is intended for welding with.

The iron powder-based curved welding rod 5 whose periphery is coated with the flux 6 specified as described above is arranged in the groove portion formed between the steel plates 3 of the pile 1 and divided into several arcs. The ceramic cover 7 is used in a state of being covered with the ceramic cover 7 and being fixed to the surface of the pile 1 with a heat-resistant adhesive or adhesive tape 8; It is divided so that it can cover the curved section of a circular tube. As such a ceramic cover 7, refractory particles, for example, zirconia balls, are divided into several pieces in an arc shape so as to form an annular shape as a whole, and a relatively heat resistant material such as an adhesive tape made of aluminum is used. It may be attached to the back of the tape thickly, or it may be formed by dividing the ceramic body mainly composed of refractory such as zirconia, alumina, magnesia into an annular shape into several arcs. Good. The ceramic cover 7 is used by being covered with a heat-resistant adhesive or adhesive tape 8 made of aluminum or the like, and fixed to the surface of the pile 1 with the heat-resistant adhesive or adhesive tape 8.

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the appearance of a pile using the present invention after welding. The pile illustrated in FIG. 1 is a PC pile (precast concrete pile), and the steel ring 3 of its end is welded to each other. , A bead 4 formed by welding is shown.
When welding the steel rings 3 at the end of the pile like this,
As shown in FIG. 2, a predetermined groove is formed around the contact portion of the steel ring 3 of each PC pile, and the horizontal welding rod is installed in the groove portion. This horizontal welding rod is a curved welding rod 5 which is curved in an annular shape so as to go around the groove portion. The curved welding rod 5 is covered with the ceramic cover 7 having the above structure, and the cover is fixed to the PC pile 1 with the aluminum tape 8.

To start welding, connect the ground electrode and welding rod to a power source and ground will be generated automatically. Since the arc is generated stably in the ceramic cover, special welding is not required and stable welding can be performed. Since the arc-shaped ceramic cover 7 is divided into several pieces, there are cuts in the ceramic cover at the cut portions. However, even if the arc heat is generated by the curved welding rod 5, the ceramic cover is fixed by the heat-resistant aluminum tape 8. Therefore, even if such a break exists, no trouble occurs when welding with the curved welding rod. High quality welding can be performed without In the example shown in FIG. 2, the ceramic cover 7 is formed separately from the adhesive tape 8. Even in this case, the presence of the break does not cause any trouble during welding.

In the case of a large-diameter pile, it can be welded by multi-layer welding, or by welding a plurality of welding rods together and covering them with the ceramic cover.

The following experiment was conducted in order to confirm that welding can be performed reliably by such a welding method and that the welded portion does not come off even when pulled.

An annular steel material with a groove whose cross-sectional shape is shown in Fig. 3 (SM
50 A material) were butted against each other, welded according to the present invention, cut in the longitudinal direction with a width of 40 mm, and subjected to a tensile test as a test piece. Three test pieces were taken and tested, and their tensile strengths were 11.5 ton, 10.90 ton, and 11.10 ton, respectively, and the welded portion has sufficient strength for practical use.

[Effects of the Invention] As described above, according to the present invention, welding of piles, which are circular tubular objects, can be performed with stable and good quality without requiring a horizontal surface on which a horizontal welding rod is placed. .

[Brief description of drawings]

FIG. 1 is a perspective view of a welded portion of a PC pile, FIG. 2 is a partial sectional view of the welded portion of the pile when welding preparation is completed, and FIG. 3 is a sectional view of a groove portion used in a welding test. 1 ... Pile, 2 ... Reinforcing bar, 3 ... Steel plate, 4 ... Bead, 5
…… Curved welding rod, 6 …… Fluxing agent, 7 …… Ceramic cover, 8 …… Heat resistant adhesive tape.

Claims (1)

[Claims] 1. A pile 1 using a steel plate 3 having a small diameter on the end side as a steel plate at the end of the pile and forming a groove when the steel plates are stacked on each other and welded in a state where the pile is vertically erected. At this time, an iron powder type curved welding rod 5 having a periphery coated with a flux 6 is arranged in a groove formed between the steel plates 3 of the pile 1 and the curve welding coated with the flux 6 is performed. The rod 5 is covered with an arc-shaped ceramic cover 7 divided into several pieces, and the ceramic cover 7 is fixed to the surface of the pile 1 with a heat-resistant adhesive or adhesive tape 8. A method for welding piles with curved welding rods, characterized in that the steel plates at the ends of the piles are welded by the iron powder type curved welding rods 5 coated with 6.