SU68850A1 - Method of making thin-walled products of closed section from asbestos cement - Google Patents

Description

There are known methods for the manufacture of asbestos cement thin-walled beams of II t. building parts of a closed section with a thickened wall in part of the section by shaping their walls using raw asbestos cement and joining individual parts either by pressing them in raw form or by gluing in a hardened state.

The above method is associated with the use of large pressing devices to obtain a strong and reliable joint between seams of considerable length or surface.

The proposed method of manufacturing thin-walled products: a closed section of asbestos cement with thickened walls in a section is characterized by the fact that in the molding process on papp-maip-1 not a billet in the form of a pipe, the additional asbestos cement is applied to the walls of the pipe and the machine is pressed into the machine. .

FIG. 1 to 3 show the process of forming the asbestos-cement element, for example, the h-beam flooring; in fig. 4 is a diagram of an installation for manufacturing a hollow core element with a concave; in fig. 5-cross-section of the workpiece with a thickening, removed from the roller pap-map; in fig. 6-cross-section of the finished product with a thickening.

The method for forming thin-walled elemen tions is made in the wake of the younggem.

Nz of asbestos cement on a pipe machine makes a pipe of the required diameter. The lateral parts of the template / - / are inserted into the freshly prepared pipe, between them the middle part of the template 2 is inserted, which has a long climax shape (Fig. I-3) and extends the lateral parts of the template to the required size. Outside the walls are crimped in shape with the help of mandrels 3. The hollow element thus obtained has, like the preform pipe, walls of the same thickness along the perimeter, and the asbestos fibers in the walls are oriented as in the preform pipe, mainly in the transverse direction.

To obtain a flexural strength component, the following method is proposed.

After winding a pipe with the required wall thickness on the format rolling pin F of the papn-machine, the machine is stopped and a strip of raw asbestos-cement sheet A is laid over the wall of the pipe along it forming a longitudinal direction of the fibers (Fig. 4). Then maschina again put into motion. When the rolling pin rotates, the p-ess-rollers of the P-paddins press strip A to the fresh walls of the pipe, prip: ressovyvaya it to them and at the same time compacted. On top of the strip, you can then wrap several more layers of asbestos cement, which are wuxi; 1 t connecting strip L with the pipe walls.

The strip A e by longitudinally oriented fibers can also be made on the pipe branch with a chute cutting through the rolling pin of the pipe wall along a helical line. The longitudinal edges of the strip are cut obliquely (Fig. 4).

After the tube a has been fabricated in an intangible way, having a thickening at a particular perimeter (hg. 5), a hollow element is formed from it by the previously described method, for example, the girder deck element b (Fig. 6), in which band A forms the reinforcement of the stretched zone.

Subject invention

The fabrication method and thin-walled asbestos cement1 (closed section with a thickened wall in part of the section, is different from the fact that, during the molding process, it doesn’t impose additional nosu / 1 raw asbestos cement and pipe moldings on the pipe in the form of a pipe in the form of a pipe on the wall). cars.