DE1484002A1 - Self-supporting roof made of asbestos cement and method of manufacturing its structural elements - Google Patents

Description

KURT MEYER

PATENT ADVERTISEMENT ³ """""',*" ⁸ ' ⁵ * ¹⁹⁶⁴

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Giorgio MarchMi, Milan / Italy

Dr. Expl.

Self-supporting roof made of asbestos cement and method of manufacturing its structural elements

The subject of the invention was a self-supporting roof, Velches is characterized in that it consists of tubular, essentially square cross-sectionally arranged individual carriers made of asbestos cement, whose butt joints are sealed by T-shaped butt covers, which each with their webs along adjacent surfaces two single beams are inserted.

The individual beams from which the roof is formed preferably have a square or rectangular cross-section, the base area ^ being twice as strong as the other side

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surfaces is (in view of the fact that the tensile strength of asbestos cement is only about a third of the compressive strength) and the vertical walls a slightly inwardly inclined and slightly protruding beyond the level of the upper wall of the liuerachnittes have ündabschnitt, so that the vertical walls of two adjacent Support leave a wedge-shaped space between their end sections, in which the in cross-section is essentially triangular web of the I-shaped joint cover inserts.

It follows that the upper wall of each tubular individual support is in the form of a channel with a flat or concave bottom and with side bands. Also the T-shaped drainage covers preferably have a ridge-forming curved upper outer surface with protruding, in the longitudinal direction in certain Spaced successive transverse ribs is provided. Have this

at
the task of deflecting the water flowing along them against the adjacent carrier and preventing water from collecting at any joints between the parts forming the S toßab dec blades.

An advantageous »method for manufacturing the pipe supports is that an asbestos cement sheet of indefinite length is produced with asbestos fibers preferably lying in the longitudinal direction, the width of which is approximately equal to one and a quarter times the circumference of the finished carrier · is that one this web in the sense of the width in the still plastic state wraps around an inflatable core with an approximately quadrangular cross-section and the two

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The end edges overlap over the entire length of the underside or base of the core, so that they are applied to the core in this way wrapped and surrounded by a thin, resilient mesh sheet introduces into a metallic outer form, the inner walls of which the profile and the Have cross section of the finished carrier that you then expand the core 'to the asbestos cement sheet finally against the outer shape to press and squeeze out the excess water, and that finally the finished carrier is molded.

The roof made in accordance with the invention has numerous noteworthy ones Advantages, of which the following can be mentioned in particular:

a) it is self-supporting and can therefore be used immediately without any intermediate layer or other auxiliary equipment, placed on the final editions will;

b) it allows, due to the continuous gutter surface, to reduce the slope of the roof considerably, thereby reducing the thermal insulation given in the carriers becomes more effective as a result of the air contained in the carriers;

c) it is rust-free, cannot rot, is soundless and impermeable to water;

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d) it is in spite of a considerable mechanical strength economically

e) it can be sawed, painted and in the case of special uses also malleable;

f) it is monolithic.

The following table provides a better explanation of the characteristics the individual girders forming the roof summarize various building data, for example:

b a S. 1 L. P. K 20th 30th 6th 7.50 8.00 14th 150

It means:

a width and

b Height of the beam in cm

s Thickness of the web forming the carrier at a distance of 1 between the supports in m

L length of the beam in m F Dead weight in kg / m

/ 2 K permissible load in kg / m of the roof.

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The invention will now be explained in more detail using an exemplary embodiment with reference to the drawing.

Fig. 1 shows part of the roof according to the invention in perspective view,

Fig. 2 is a cross-section through two adjacent pipe supports of the roof with associated joint cover,

Fig. 3 shows a bumper cover in plan and

Fig. 4 is a cross section through an apparatus for making a drill carrier.

The roof partially shown in Fig. 1 consists of a plurality of juxtaposed, tubular individual supports 1, which on the support beam 3 (only one of which is visible in Fig. 1) rest or are attached, as well as from butt covers 2, their The task is to prevent water seepage at the joints of two to prevent adjacent carrier 1.

In the case shown, the individual drill supports are obtained from asbestos cement sheets, sheets or plates in the following manner.

. Starting from a web or plate produced in a manner known per se from an asbestos cement br ei, this is according to its width

-6-

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around an inflatable core 4 which is essentially square in cross section (Fig. 4) made of rubber or similar material, care being taken that the longitudinal edges 5,6 at the bottom of the core come to lie on top of each other. The plate placed around the expandable core is then made into an outer mold 8, optionally in two parts Steel, on the inner wall of which there are one or two nets and which is provided with holes 9 for the water to exit. Of the Expanded core is now expanded by the inlet of pressurized water or compressed air, so that the asbestos cement board against the inner wall of the Outer shape 8 is pressed and thereby assumes its final shape.

/ 2
The high contact pressure of around 80-100 kg / cm ensures the best possible ratio between residual water and cement (0.25) and guarantees a monolithic asbestos-cement structure. Finally, after the pressure medium has been discharged from the expandable core, it is molded together with the finished molded body.

In Fig. 2 the final shape of the ear supports can be clearly seen. The base is twice as thick as the other walls. The vertical walls have end sections 10,10 'that are slightly inward converge and protrude above the plane of the upper wall with which they are connected by sections 11,11 '. To this Way is given the top of each drill support the shape of a channel with lateral edges, so that the water drainage is favored.

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The inclination of the end sections 10, 10 * also has the purpose of allowing the joint covers 2 to be attached between adjacent beams 1. The butt covers 2, which are also made of asbestos cement, have a substantially T-shaped cross section, as can be seen from FIGS. The web 2 ¹ is wedge-shaped, and the leg has a flat or curved upper outer surface on which transverse ribs 2 ″ protrude at certain mutual intervals, which run obliquely in the direction of the roof pitch in order to deflect and drain the water against the adjacent beams favor.

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Claims (5)

Dr. Expl. PATENT CLAIMS: (1. Self-supporting roof made of asbestos cement, characterized in that that it consists of tubular, essentially square in cross-section, side by side arranged single beams (l) and from the butt joints sealing joint covers between the adjacent individual beams (2) exists. 2. Roof according to claim 1, characterized in that the base area of each individual beam with a square or rectangular cross-section (1) has twice the thickness, at least greater than that of the other walls, and that the end sections (10,1O ¹ ) of the vertical walls are slightly inclined and converge in order to provide between the adjacent supports the area for inserting the webs (2 *) of the T-shaped bumper cover (2) to create the necessary space. 3. Roof according to claims 1 and 2, characterized in that the inclined end portions (10,10 *) of the vertical walls of a each individual support protrude above the level of the upper i / and and are connected to this by sections (1 ^, 11 '), whereby the, upper wall takes the form of a gutter with side edges. 4. Roof according to claims 1 to 3> characterized in that each bumper cover (2) has a substantially T-shaped profile 809812/0991 " ⁹ " with a wedge-shaped web (2 *) and a leg, whose upper outer surface 'curved to form a ridge and is provided with a number of protruding transverse ribs. 5. A process for the production of the single carrier forming the roof according to the preceding claims, characterized in that, in a manner known per se, from asbestos cement a sheet or a sheet. Plate or the like. Forms, the same in still plastic state in the sense of the width around a flower core with a square cross-section, with the two end edges at the Bottom of the core are placed one above the other essentially over its entire length, after which it is placed around the inflatable core Sheet is introduced into a rigid outer shape with the interposition of a flexible net, the inner wall of which has the profile, des Has to be produced carrier, after which the inflatable core is expanded and the plate is pressed against the outer mold under a pressure of about 80-100 atmospheres while squeezing out the excess water and finally the drill support is formed immediately. 809812/0981