CS243270B1 - Part of the mold for the production of concrete masts and the method of its production - Google Patents

Abstract

The solution is useful in the production of concrete poles and in the export of equipment for the production of concrete poles, especially to developing countries. The part is preferably made of malleable cast iron and consists of a selected number of shaped castings (1), of which the front one is provided with a guide disc (3) on the narrower side and the rear flange (2) on the wider side. The shaped castings are assembled into the shape of the part, their joints are welded around the entire circular circumference with V welds. Then, the external and especially internal surface treatment is performed.

Description

The solution is applicable in the production of concrete poles and in the export of equipment for the production of concrete poles, especially to developing countries.

The part is preferably made of malleable cast iron and consists of a selected number of shaped castings (1), the front of which is provided with a guide disc (3J on the narrower side and a rear flange (2j on the wider side). the joints are welded along the entire circumference of the V welds, and then the outer and especially the inner surface is treated.

The invention relates to a mold part for producing concrete poles by centrifugation from prestressed concrete and to a method for producing this part.

The components used to form the longitudinally non-split mold for the rotary manufacture of prestressed concrete poles were made of a thick-walled seamless tube, the inner surface of which was machined to a device designed for the desired conicity and cone surface quality as described in the description k cs. No. 125,758. The outer surface was turned into a conical shape. The whole part was made of one piece of pipe, after which they were welded to one fillet weld and one half U weld of the connecting flange. In addition, the mold parts were provided with guide discs. The main disadvantage of the prior art was the high metal losses, as 50 to 60% of the rolled material was reduced during machining. The workmanship in the manufacture of parts was also considerable and the method of welding the flanges was not advantageous in terms of welding technology. Welds were the site of defects in the formwork demoulding, especially at the tip of the mold.

Most of these disadvantages are overcome by the hollow truncated cone mold part for the production of concrete masts provided with a flange according to the invention on the wider side. Its essence is that it is composed of a selected number of shaped castings which are joined together in a weld. Molded castings may be malleable cast iron. The essence of the production method is that after the molded castings are cast, these are assembled in the form of parts, in which V is welded in the entire circumference; welded and finally finished on the outer and inner surfaces.

The advantages of the mold part for the production of the concrete poles according to the invention are both material and working. This utilizes considerable metal savings, which previously had to be turned to obtain a conical mold shape. Also, the work involved in manufacturing the part has been reduced and, moreover, the mold defects during the peeling of the mast are eliminated. The length of the shaped castings can be chosen to suit the space and technological equipment of the foundry.

Accordingly, the mold made from the parts according to the invention will be cheaper.

An example of a mold part for producing concrete poles is drawn in longitudinal section on the attached drawing.

The part consists of three shaped castings 1, preferably of malleable cast iron. At the narrower point of the front casting 1 there is a guide disc 3, at the wider position of the rear flange 2. The central shaped casting 1 is a hollow truncated cone. The shaped castings 1 are connected to each other by V welds 4 along the entire length of the circular circumference.

The individual shaped castings 1 are assembled in the form of a mold part for the manufacture of concrete poles, welded in the entire circumference in a weld 4 and finally machined on the outer and especially the inner surface so that the surface is completely smooth and does not impart peeling resistance.

The mold for the production of concrete poles is assembled from individual parts from the narrowest to the widest by means of flanges 2 inserted inside the guide discs 3.

Application of the invention is envisaged both in the manufacture of concrete poles and in the export of equipment for the manufacture of concrete poles, where the molds form a substantial part of the total investment.

Claims (2)

SUBJECT r .......'........ A hollow truncated cone-shaped molded concrete mast part provided with a guide disc at the narrower side and a flange at the wider side, characterized in that it consists of a selected number of shaped castings (1j) which are joined together in a weld (4) . ynAlezd 2. A method according to claim 1, characterized in that after the molded castings are cast, they are assembled in the shape of a part, welded in contact over the entire circumference and welded on the outer and inner surfaces.