JPH0657941B2 - Prefabricated pile with horizontal welding rod - Google Patents

Description

Description: [Industrial application] The present invention relates to a prefabricated pile that can simplify the work of joining piles.

[Prior Art] Conventionally, even in semi-automatic and manual welding, a horizontal welding rod having a coating layer made of a flux around a core wire of copper or the like has been widely used. Is a straight type, and no horizontal welding rod has been produced yet that can be used for welds that require curved welding.

Therefore, a highly efficient welding method such as the CAW method (continuous horizontal arc welding method) can be carried out for welding the straight portion, but in the case of welding of prefabricated piles, according to the well-known knowledge of the piles at the construction site of the piles. These excellent welding methods have not been available because they require curved welding.

Therefore, when connecting conventional piles, it is common practice to temporarily attach the joints at the ends of adjacent piles and then manually perform two-layer welding. In addition to the large number of times, the welder and welding equipment had to move around the welded portion of the pile.

[Problems to be Solved by the Invention] The present invention intends to provide a novel pile capable of solving the problem that the welder and the welding apparatus have to move around the welded portion of the pile of the prior art. It is a thing.

[Means for Solving the Problems] A pile of the present invention is a pile having a welded joint at its end for connecting by welding, and the joint is a laterally arranged circular, arcuate or square annular shape. It is a prefabricated pile characterized by bonding welding rods.

The above-mentioned circular, arcuate or prismatic ring in the present invention does not have to exist in the same plane, and the point is that it should be adapted to the shape of the welded portion.

A concrete example of this will be described with reference to the drawings.
The horizontal welding rod 3 has a coating layer 2 made of flux around the core wire 1 and is formed into an arc shape as a whole.

FIG. 10 shows an example in which the horizontal welding rod 3 is formed into a quadrangular ring shape, which is used, for example, when connecting square pillar-shaped piles by welding.

Furthermore, for example, in the example shown in FIG. 3 etc., the entire circumference of the pile is surrounded by one horizontal welding rod 3, but the length of one welding rod is usually limited to about 1 m, so If the pile has a diameter, a predetermined number of arc-shaped welding rods are provided.

In short, the horizontal welding rod 3 used in the present invention is a coated welding rod formed so as to match the shape of the welded portion.

The method of forming the horizontal welding rod 3 having such a shape will be described. First, the core material is extruded together with the flux coating component to form a linear welding rod similar to the conventional horizontal welding rod, and the coating is dried. Then, there is a method of forming into a predetermined shape before the plasticity is lost. In this case, in order to minimize the so-called springback phenomenon due to elasticity in the core material, a sufficiently annealed material is used as the core material, or a core material formed by twisting fine wires into a wire shape is used.
Only by selecting plasticity that makes it easier to plastically deform and the plasticity of the coating component is also easily plasticized, the horizontal welding rod 3 having a desired bent shape was successfully achieved.

[Example] The prefabricated pile of the present invention will be described in more detail with reference to an example shown in the drawings.

The pile shown in FIG. 1 is a pile in which the horizontal welding rod 3 is attached to the lower joint 5, and the PC steel rod 7 of the pile 4 which is the upper side of the welded portion.
It is an example of the prefabricated pile in which the horizontal welding rod 3 is provided around the joint 5 at the lower end connected to the. When the horizontal welding rod 3 is mounted on the lower joint 5 as described above, it is preferable to provide a groove for accommodating the side surface of the welding rod 3 in the peripheral portion of the joint 5 of the pile, as shown in FIG. .

The pile shown in FIG. 2 is a pile in which a horizontal welding rod 3 is attached to a large-diameter joint 6 protruding in a brim shape at the upper end, and the joint 6 at the upper end of the pile 4 below the welded portion. It is an example of a ready-made pile in which the horizontal welding rod 3 is provided around the. When the horizontal welding rod 3 is mounted on the joint 6 of the pile 4 as described above, it is preferable to provide a groove into which the welding rod 3 is inserted on the upper surface of the joint 6 as shown in FIG. As shown in FIG. 8, it is preferable to provide an enclosure of the ceramic sheet 9 around the welding rod 3 because it can prevent the phenomenon of obstruction of welding due to wind or the like.

The cross-sectional shape of the horizontal welding rod 3 is, as shown in FIGS. 4, 7, and 8, a shape in which a part of the coating 2 facing the side where the fillet welding is performed is deleted. It is preferable to mount the above-mentioned one because the directional stability of the arc is improved.

Therefore, when connecting a preformed pile having the horizontal welding rod 3 to the lower joint 5 as shown in FIG. 1 as an upper pile, for example, the prefabricated pile as shown in FIG. Using a pile without a stationary welding rod, the upper pile is lowered onto the lower pile as shown in FIG. 6, and the joint 5 and the joint 6 are joined. This joined state is shown in FIG. 3, and the cross-sectional state of the main part is shown in FIG.

The same state as this, when connecting piles using the prefabricated pile shown in FIG. 2, has a joint of the same shape as shown in FIG. 1 and has no horizontal welding rod attached. It can be reproduced when used with the upper pile.

The state immediately before the piles are brought close to each other is shown in FIGS. 6 and 7.

In this way, the piles are brought close to each other in the state of FIG. 3, and current is applied from one end of the horizontal welding rod 3 to weld the piles to each other by the same means as when welding the plate-shaped body with the conventional horizontal welding rod. it can. The state after welding is shown in FIG.

Although the structure of the lower part of the pile and the structure of the upper part of the pile are shown separately in the above embodiments, the structure shown in the drawings may be used for the upper part and the lower part of one pile.

[Effects of the Invention] As described above, by using the pile in which the horizontal welding rod of the present invention is mounted in advance, it is not necessary to set the welding rod or the like at the construction site of the pile, and the welding of the pile can be performed. It is a simple process and eliminates the need for multiple layers of welding and the need for welders and welding equipment to move around the pile, as in prior art pile welding.

[Brief description of drawings]

FIG. 1 is a perspective view of a concrete example of a pile of the present invention in which a horizontal welding rod is attached to the lower end of an upper pile, and FIG. 2 is a concrete example of the present invention in which a horizontal welding rod is attached to the upper end of a lower pile. FIG. 3, FIG. 3 is a perspective view of a joint portion when the pile of the present invention is joined, FIG. 4 is a cross-sectional view of a main portion of the joint portion of FIG. 3, and FIG. Sectional view, FIG. 6 is a sectional view showing the joined state of the upper and lower piles when the pile of FIG. 1 is used, and FIG. 7 shows the joined state of the upper and lower piles when the pile of FIG. 2 is used. Sectional drawing, FIG. 8 is a sectional view showing a joined state of upper and lower piles when another concrete example of the piles illustrated in FIG. 2 is used, and FIG. 9 and FIG. It is a perspective view which illustrated the concrete shape of the stationary welding rod. DESCRIPTION OF SYMBOLS 1 ... Core wire, 2 ... Coating, 3 ... Horizontal welding rod, 4 ... Pile, 5 ... Joint, 6 ... Joint, 7 ... PC steel rod, 8 ... Fillet weld, 9 ... Ceramic sheet.

Claims (1)

[Claims] 1. A pile having a welded joint at its end for connection by welding, wherein the joint is equipped with a transverse welding rod formed in a circular, arcuate or rectangular annular shape. Ready-made piles.