GB2143010A

GB2143010A - Fire-resistant chamber with an arched roof

Info

Publication number: GB2143010A
Application number: GB08415943A
Authority: GB
Inventors: Hans-Georg Boege; Manfred Geigenmuller; Gunter Hahnel; Willfried Seifert; Edgar Schlegel; Horst Nowak
Original assignee: DESSAU ZEMENTKOMBINAT
Current assignee: DESSAU ZEMENTKOMBINAT
Priority date: 1983-06-23
Filing date: 1984-06-22
Publication date: 1985-01-30
Also published as: GB8415943D0; DE3422707A1; DD229571A3; FR2549213A1; FR2549213B1; GB2143010B

Abstract

The invention relates to a holding device for a self-supporting fire-resistant arched roof (7), which may be used for clinker grate coolers in the cement industry. The holding device comprises downwardly extending struts (1), a compression member (2), tension member (3) and tie rods (4) co-operating to support bearing supports (6) on which the self-supporting arched roof is disposed. The holding device is suspended from an over head structure (8). <IMAGE>

Description

SPECIFICATION Fire-resistant chamber with an arched roof The invention relates to a fire-resistant chamber with an arched roof and to a holding device for a self-supporting arched roof, in particular but not exclusively for clinker grate coolers used in the cement industry.

The fire-resistant roof construction used up to now in clinker grate coolers has been a horizontal suspended roof. Special cast bars, acting as holding devices, are suspended from the roof supports of an overhead steel construction by means of bolts, and roof bricks are positively connected to the bars. The drawback of this suspended roof lies in the fact that the roof bricks split after a very short period as a result of the high thermal stresses and a notching effect produced by the positive suspension. Also, the special cast bars result in rapid break up of the suspended roof due to high thermal stresses. Additionally the holding device is extremely costly in terms of material.

A major disadvantage, which is a result of the steel construction of the clinker grate cooler, is that the horizontal suspended roof cannot be replaced by a self-supporting arched roof as the horizontal forces which arise cannot be taken up by the steel construction used.

Fire-resistant arched roofs with self-supporting properties are known, which rest on supports with the horizontal forces from the roof being directly taken up by the steel construction of the plant. For this purpose it is necessary to provide the supports with high bending stresses, and the bending moments produced by the roof on the supports must be taken up by the concrete foundations. This construction requires the steel supports to have very large cross-sections and requires very dense foundations.

In addition, this construction is susceptible to malfunction, as modifications of the arched roof as a result of thermal stresses lead to considerable variations of the bending forces in the main supports with the result that the entire plant structure is subject to modified stresses.

The aim of the invention is to replace the horizontal suspended roofs used up to now for example in clinker grate coolers in the cement industry by an arched roof but without the problems associated with an arched roof heretofore mentioned.

According to the invention there is provided a chamber for use at elevated temperatures, comprising first and second spaced apart fire-resistant walls, a fire-resistant self supporting arched roof spanning the walls, and suspension means suspending the arched roof over the walls.

In accordance with the invention, there is furthermore provided a holding device for selfsupporting fire-resistant arched roofs, in which the steel plant construction used is not affected by the horizontal forces from the arched roof, in which it is not necessary to undertake any major modifications to the actual plant construction, and in which the formation of the main supports as bending supports and the production of corresponding very dense concrete foundations are not required.

More particularly the invention provides hinged frames, consisting of perpendicular struts, a com pression member, a tension member and tie rods of steel, which are suspended on the steel construction and hold wall supports on which an arched roof is disposed.

The dimensions and shape of the hinged frames may be such that the horizontal forces from the self-supporting arched roof are only taken up by the hinged frames. The suspension of the hinged frames and therefore of the arched roof only therefore supplies perpendicular forces to the plant construction.

Advantages of the invention consist in that horizontal suspended roofs may be replaced by selfsupporting arched roofs using the holding device, in that the actual steel plant construction does not have to undergo substantial modifications, in that the main supports do not have to be dimensioned as bending supports, in that the plant construction is not affected by horizontal forces from the arched roof, in that there is no need for the horizontal suspended roof which is costly in terms of material and therefore no need for the bolts, cast bars and casting required for the suspension of the arch bricks and in that these components which constantly need to be replaced as a result of wear are replaced by a construction which has a very low degree of wear, i.e. the holding device.

A major advantage of the invention consists in that the service life of the fire-resistant casing is substantially increased.

In order that the invention may be more fully understood an embodiment thereof will now be described by way of example with reference to the accompanying drawings wherein: Figure 1 is a partial elevational view of a chamber provided with a suspended arched roof, in accordance with the invention; and Figure 2 is a view from above of the roof of Figure 1.

Referring to Figure 1, a chamber for use at elevated temperatures, in this case a clinker grate cooler used in the cement industry, has two upright fire-resistant walls 9, 10 spanned by a selfsupporting fire-resistant arched roof 7. The weight of the roof 7 is supported by suspension means which suspends the roof from an overhead structure 8 which comprises part of the plant construction. The suspension means consists of a roof holding device which includes downwardly extending struts 1, which are subjected to tensile bending, compression member 2, tension member 3 and tie rods 4. These components are disposed using steel construction techniques in an articulated manner in a hinged frame 5. Several hinged frames 5 support the bearing supports 6 on which an arched roof 7 is disposed. The hinged frames 5 and therefore the arched roof 7 are suspended on the plant construction 8. The number of hinged frames 5 and the dimensions of the individual components are selected in accordance with the span width and dimensions of the arched roof 7.

Claims

1. A chamber for use at elevated temperatures, comprising first and second spaced apartfireresistant walls, a fire-resistant self-supporting arched roof spanning the walls, and suspension means suspending the arched roof over the walls.

2. A chamber according to claim 1 comprising a clinker grate cooler.

3. A chamber according to claim 1 or 2 including an overhead support structure, suspension struts extending downwards from the support structure, and support means on the struts adjacent the walls, the arched roof resting on the support means.

4. A chamber according to any preceding claim including means in tension extending between opposite sides of the arched roof.

5. A holding device for a self-supporting fireresistant arched roof wherein struts, a compression member, a tension member and tie rods cooperate to support bearing supports on which a selfsupporting arched roof is disposed.

6. A holding device according to claim 5 wherein all the horizontally acting forces from the arched roof are taken up by hinged frames.

7. A chamber for use at elevated temperatures substantially as hereinbefore described with reference to the accompanying drawings.

8. A holding device for a fire-resistant arched roof substantially as herein before described with reference to the accompanying drawings.