Weather shelter for working platform for the erection of factory chimneys

Aug. 3, 1965

W. NERLICH

WEATHER SHELTER FOR WORKING PLATFORM FOR THE ERECTION OF FACTORY CHIMNEYS

Filed Dec. 2, 1963

3,198,285

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United States Patent Office

3,193,285

Patented Aug. 3, 1965

3,198,285

WEATHER SHELTER FOR WORKING PLATFORM FOR THE ERECTION OF FACTORY CHIMNEYS

Wiihelm Nerlich, Duisburg-Meiderich, North Rhine-Westphalia, Germany, assignor to Deutsche Babcock und Wilcox Dampfkesselwerke AG., Oberhausen (Rhine), Germany

Filed Dec. 2,1963, Ser. No. 327,352 Claims priority, application Germany, Dec. 1,1962,

D 40,415

Claims. (CI. 182—128)

The invention relates to improvements in weather shelters in connection with the erection of factory chimneys to be built of brickwork or concrete and having a diameter constantly decreasing in relation to its height, and has for its object a circular tent which provides protection of the working platform and the outer edge of the chimney during the climbing action of the working platform step by step within the chimney.

The purpose of the present invention is to provide tentpoles arranged in such a manner that they will be able to follow the constantly changing diameter of the chimney in all building sections of the chimney decreasing in diameter without any changes in the construction of the tent-poles, and, furthermore, that any side loads caused by the wind and acting on the circular tent may not be transmitted to the new brickwork.

More specifically the invention is characterized by the main feature that the poles embracing the chimney wall are pivotally fastened to the roof girders of the circular tent which are supported by the working platform and remain unchanged during the building of the chimney. In this way the poles embracing the chimney will be able to follow automatically the constantly changing diameter of the chimney in all building sections without any changes of the construction of the poles itselves.

One form of embodiment of the present invention will become apparent from the enclosed drawing, in which:

FIG. 1 shows a vertical section of the chimney with working platform and circular tent, the left part of it representing the lower building section, and the right part showing the upper building section;

FIG. 2 shows a plan view of the circular tent according to FIG. 1.

Referring to FIG. 1 the working platform 1 known in its essential parts, which is arranged within the chimney 2 and supported in openings or cavities of the brickwork will be raised in known manner to the next higher working position after completion of a building section of a height of about 2.5 m. During this movement the working platform is supported on the safety platform arranged under the working platform and being raised accordingly for being supported in the same cavities of the brickwork which served as support for the working platform 1.

Above the working platform 1 the circular tent 3 is arranged the roof girders 4 of which consist of radially arranged binding joists 6 and rafters 7 connected by means of bridging joists 5 and resting upon beams 8. The beams 8 are arranged on the box type girders 9 of the working platform 1 following the circular line “a” the diameter of which being somewhat smaller than the upper clear diameter of the chimney 2. The poles 1® embracing the chimney wall are connected to the binding joists 6 and rafters 7 by means of the hinge joint 11. The poles consisting of two parts 10', and 10 are pivotally connected by means of the hinge joint 12. The covering of the tent (not shown in the drawing) may consist of canvas cover, or, for reasons of light weight and easier foldability, of synthetic material. In order to maintain a certain distance between the poles embracing the wall and the wall itself, the . lower poles 10 are provided with spacers 13 equipped with rollers 14 for gliding along the outer wall of the chimney.

During the first building sections of the chimney the circle formed by the poles 10 connected to the binding 5 joists 6 and rafters 7 is greater than the diameter of the roof of the working tent 3. In the middle stages of the building sections the poles 10 embracing the wall are approximately vertically pendent in relation to the edge of the roof, whilst during the last building sections the cir10 cle formed by the poles 10 is smaller than the diameter of the roof of the tent. In order to provide for an equal distance between the poles 10 embracing the wall and the wall itself in all positions and even in the case of existing lifting forces caused by the wind, the lower poles 10 15 forming part of the poles 10 will be pressed inwards by means of a tensioning rope 15. The poles 10 are provided at their lower end with ears 16 for the fastening and guidance of the tensioning rope 15 the tension length of which may be altered by means of the turnbuckle 17. 20 Before raising the working platform 1 the tensioning rope 15 will be released from the side of the stirrup ladder 18, and tensioned again after having reached the new working position of the working platform 1 together with the circular tent.

For the improvement of the stability of the circular tent obtained by means of the tensioning rope 15, a further tensioning rope 19 may be provided for the poles 10' having a changing inclination. The tensioning of this second rope 19 held by the ears 20 fastened to the poles 30 10', can be effected from within the tent by means of a turnbuckle.

The poles of the tent will be preferably made of aluminium tubes.

The form of embodiment shown in the drawing com35 prises a circular tent with an open frame 21 arranged in the middle of the roof, and with a lifting frame 22 extending within the open frame 21. However, attention is drawn to the fact that the invention is not limited to this form of embodiment but can be also applied to climbing ⁴⁰ working platforms with a low-level lifting frame and closed roof of the tent.