FR2782336A1 - Process for creating top roofing on corrugated asbestos cement fiber roof tiles, includes metal stirrup pieces being inserted in hollows of existing roof tile corrugations to support each transverse covering of tiles - Google Patents

Abstract

Metal stirrup pieces are inserted in the hollows of the existing roof tile corrugations to support each transverse covering of lower and upper tiles of the roof. Holes (15) in the stirrups enable them to be nailed to a primary wooden or metal joists to enable a top roofing of tiles to be made. When the edge of the roof is longer than the battens (12) these are joined by means of a connecting fishplate (6) which is positioned astride the battens and fixed by nails through holes (15).

Description

-1- The present invention relates to the renovation of roofing sheets

asbestos fibers

  corrugated cement in order to achieve any type of overcovering.

  Proceeding today as it is commonly done with a renovation of these said roofs, requires special conditions with regard to the recovery of harmful dust during drilling or cutting of said plates. Special conditions also with regard to the handling, reconditioning, transport and reprocessing of asbestos cement fiber sheets in the event of dismantling of these covers in order to comply with the regulations on

asbestos in force since 1997.

  The method according to the invention overcomes these drawbacks.

  It also makes it possible to carry out the renovation of this type of roofing without dismantling the existing cover, without drilling the support, without special tools, and an execution

very fast work.

  I. Method of fixing a primary wood frame for all types of roofing (small and

large elements) fig. 1.

  The system consists of metal fixing brackets (fig. 4.5.7), perforated steel strip and a wooden counter-batten (12) allowing the creation of a primary framework in order to renovate this type of roofing by the over-covering process without dismantling or drilling

  existing corrugated sheets (17.18) figl.

  The metal fixing bracket (fig. 5) consists of a shoe-shaped part (13) curved at its base with a radius of 50 mm corresponding to the wave cavity of the corrugated plates, making it possible to receive a counterattack. (12) which will be introduced and fixed by nailing or screwing

  on the vertical wings (14) of said shoe (13) through holes (15) provided for this purpose.

  Said stirrup (5) is extended by a gouge-shaped spoon (16) of the same radius, tapered and rounded at its end in order to be easily inserted in the hollow of the wave under each transverse covering of said plates (17 and 18) without risk of degradation of these

  last and thus ensure the maintenance of the primary framework to be lifted.

  In the hollow of the wave and at each transverse overlap, the stirrup (5) is presented on the spoon side (16) and by sliding from the bottom upwards, the latter is penetrated until it blocks.

  between the existing bottom plate (18) and the existing top plate (17).

  We repeat the operation over the entire length of the ramp to obtain a line of hooves (5). We do this every four waves to get a

  distribution of hooves (5) over the entire surface of the roof to be treated.

  The process is characterized by the positioning and fixing in the upper part of the pan

  roof, end stirrups (fig. 4) to prevent the load from falling from the overcover.

  -2- The end brackets (4) are positioned after removing the ridge pieces from the existing cover to release the upper transverse ends of said corrugated plates (17). Because of all the four waves and in alignment with the stirrups (5) previously fixed; we present the end bracket (4) tongue side (22) under the plate (17), wing side (14) on the plate (17}, and by sliding from top to bottom until it locks

  we fix the latter to finish at the top end the alignment of stirrups (5).

  The process is characterized by the installation and fixing in the lower part of the roof pan, end stirrups (fig. 4) in order to eliminate the risk of lifting the roof overhang to be made when the roof is exceeded. The end bracket (4) is positioned all four wave hollows in alignment with the previously fixed brackets (5). We present the end bracket (4) on the lower transverse end of the plate (18) tongue side (22) under the plate (18) wing side (14) on the plate (18) and by sliding from the bottom upwards until blocking, we fix the latter to finish at the lower end the alignment of stirrups (5). We thus obtain the fixing system ready to receive the wooden counter-slats (12) which will constitute the primary framework sought. These counter battens (12) are introduced into the alignments of

  shoes (4 and 5) and fixed by nailing or screwing in the holes (15) provided for this purpose.

  In the case where the roof panel is greater than the length of the counter-laths (12) used, we proceed to butt-joint them by means of the connection splice (fig. 6) which will be positioned astride the two ends joists (12) in place and

  fixed by nailing or screwing through the holes (1 5) provided for this purpose.

  In the case of a steep slope of the existing roof, we reinforce the device of the primary framework (4.5.12) by fixing a strip of perforated steel at the high ends of each lath (12). This strip will be positioned astride the ridge so as to obtain, in the event of a large drop in load, the force balance between one side and the other of the

overcover.

  In the case where the use of a metal frame (fig. 11) is recommended, it will be fixed to the wooden frame (12) by the fixing bracket (7) fig.3. The latter consists of four

  pierced wings (19), folded back in the shape of a rider, to position itself astride the counter

  wooden batten (12) with the desired gauge; The stirrup (7) is fixed by nailing or screwing

  by means of the holes (15) provided for this purpose.

  Said stirrup (7) has in its upper part two vertical wings (20) cut into

  form of pins (21) intended to support and fix by clipping the metal rail (1 1).

  B. Method of fixing a metal frame for large roofing

  elements (b ac aier, asphalt slabs,) fig, 2.

  -3- The system is made up of metal fixing brackets (fig. 8 and 9) and rails (fig. 11) allowing to realize a primary metallic framework (8.9.11.) In order to renovate a roof in sheets of asbestos cement fibers corrugated by the overcoating process without

  disassembly or drilling of existing plates (17.18) fig.2.

  The metal fixing bracket (8) consists of a shoe-shaped part (13) curved at its base with a radius of 50 nun corresponding to the hollow of waves of the corrugated plates (17 and 18), two vertical wings (20) cut in the shape of tenons (21) intended to support and hold by clipping the rail (11) which composes the desired primary metallic framework. Said stirrup (8) is extended by a spoon (16) curved in the shape of a gouge, with a radius of 50 mm corresponding to the hollow waves of the plates (17.18), tapered and rounded at its end in order to be inserted easily under each transverse covering of said plates (17 and 18) without risk of deterioration of the latter and thus ensuring retention when lifting

  of the primary framework (8.9.11) put in place.

  In the hollow of the wave and at each transverse overlap, the stirrup (8) is presented on the spoon side (16) and by sliding from the bottom upwards it is made to penetrate the latter until it blocks.

  between the existing bottom plate (18) and the existing top plate (17).

  We do this every four waves in order to obtain a distribution

  stirrups (8) on the entire section of the roof to be treated.

  The process is characterized by the fixing in the upper part of the roof panel of the stirrups

  end (fig. 9) in order to avoid the load lowering of the overcover to be produced.

  The end stirrups (9) are positioned after removing the ridge pieces from the existing cover to release the upper ends of said plates (17), at the rate of all the four waves and in alignment with the stirrups (8) previously fixed, we present the end bracket (9) tab side (22) under the plate (17), wing side (20) on the plate (17) and by sliding from top to bottom until we lock let's fix this for

  obtain the support necessary to maintain the metal rail (11).

  The process is characterized by the fixing in the lower part of the roofing panel of the end stirrups (fig. 9) in order to eliminate the risk of uplifting beyond the overcovering to be achieved. The end brackets (9) are positioned every four waves of the plates (18) and in alignment with the brackets (8) previously fixed. We present the end bracket (9) tongue side (22) under the plate (18), wing side (20) on the plate (18) and by sliding from the bottom

  upwards until blocking we fix the latter.

  We do this over the entire area of the roof to be treated, in order to obtain a

distribution of stirrups (8 and 9).

  -4- When clipping the rails (11) on the stirrups (8 and 9), we proceed for roofing lengths of more than 3 m the joining of the metal rails (11) by means of the connection splice (fig . 1 0) in order to obtain a rail frame (11) discontinuous over the length

total roof to renovate.

  The process fig. 2. is ready to receive the chosen large element roofing material which

  will be fixed by screwing on the metal rails (11) we place.

-5-

Claims (4)

- CLAIMS -   1) Device for renovating a roof made of corrugated asbestos cement fiber sheets, by creating an overlay of traditional or other type without degradation or puncturing of the existing cover. To carry out a roofing renovation of this kind today, requires in the event of removal of the existing roofing, special conditions concerning the handling, reconditioning and transport of these said corrugated sheets in order to be in compliance with the regulations on the asbestos in force since 1997.The claimed device allows a very great speed, a fixing without drilling of the existing cover, the use of a very simple tool for the execution of a renovation by the over-cover system on all types of corrugated fiber cement roofing. It differs from known systems, which consist in fixing a framework on the existing roof by screwing metal pillars on the supporting structure which requires drilling of said plates causing an emission of harmful dust in case of non-compliance with the precautions to be taken. The device also differs from the known system intended for fixing at the top of waves.   by stapling and tightening a very light insulation.   2) The invention is characterized with regard to the fixing without degradation or drilling of the existing cover, by insertion of metal stirrups (4.5.8.9) in the hollow of the waves of the plates (17.18) fig. 1 in order to use the existing framework as a support and under each transverse covering of the lower (18) and upper (17) plates of said cover, in order to fix a primary wood (12) or metal (11) framework making it possible to produce over-covering of any type (terracotta or concrete tiles, metal tiles, steel pan ...). 3) The device is characterized using the methods fig. 1 and fig. 3, by positioning the upper and lower ends of the existing cover, the end stirrups (4) in order to cancel: in the upper part, the phenomenon of load lowering of the overcover to be produced. Device that can be reinforced in the event of a steep slope of the existing roof by the installation of a perforated steel strip placed astride the ridge and fixed on the upper ends of the joists or wooden battens (12) used to to balance the forces between one side and the other of the roof. In the lower part the uplift phenomenon in roof overhang.   4) The device is characterized using the method fig.2, by positioning the upper and lower ends of the existing cover the stirrups (9) in order to cancel the upper part of the load lowering phenomenon, in the lower part the phenomenon of lifting in exceeded roof.   -6-) The device is characterized by joining the primary wood frame (12) with the connection splice (6), and joining the primary metal frame (1 1) with the connecting bar (10) in order to obtain continuity of the primary framework put in place.