US3129678A - Furnace roof - Google Patents

Description

April 21,' 1964 w. L. MURRAY 3,129,678

' FURNACE ROOF Filed Oct. 3, 1961 I/VVENTO/P W/LL IAM L. MURRAY 51 kmwfi $154;

A fforney United States Patent Ofiice 3,129,578 Patented Apr. 21, 1964 3,129,678 FURNAfIE ROOF William L. Murray, Duinth, Minn, assignor to United tates Steel Cerporatien, a corporation of New Jersey Fiied Oct. 3, 1961, Ser. No. 142,591 1 Claim. (Ci. 11t 99) This invention relates to a furnace roof and more particularly to a basic roof for open hearth furnaces in which hold down beams are provided for limiting upward expansion of the arch. Prior to my invention it was common practice in order to take care of roof irregularities to cut refractory bricks to the desired size and insert the bricks between the bottom portions of the hold down beams and the arch bricks. This was not satisfactory since the bricks inserted between the beam and arch would fall out of place when the roof sagged even a relatively small amount. Thus, the hold down function of the beam was lost. Also, at times the bricks would be crushed due to excessive upward thrust of the roof.

It is therefore an object of my invention to provide a furnace roof in which means are associated with the hold down beams in such a manner that the hold down function of the beams is not lost.

This and other objects will be more apparent after referring to the following specification and attached draw ing, in which:

FIGURE 1 is a plan view showing a portion of an open hearth roof;

FIGURE 2 is a view taken on the line IIH of FIG- URE 1; and

FIGURE 3 is an enlarged view of a portion of FIG- URE 2 showing the present invention.

Referring more particularly to the drawings reference numeral =2 indicates front buckstays and reference numeral 4 the back buckstays of an open hearth furnace. A basic brick sprung arch 6 extends between the front and back buckstays and is supported by the skewbacks 8 and 10 in the usual manner. A plurality of horizontal beams 12 arranged in pairs with their flanges facing each other extend between and are supported by the buckstays 2 and 4. A plurality of webs 14 extend between and are sup ported by the webs of each pair of beams 12. Each of the webs 14 has a hole 16 therein for receiving a hold down rod 18 which is threaded at its upper end for receiving nuts 20, one on each side of the web 14. A plurality of spaced apart I-beams 24 are arranged transversely of the beams 12 on each side of the crown of the arch with their lower flanges spaced from the upper surface of the arch 6. The upper flanges of the beams 24 support bent beams 26 which extend in the direction of the span of the arch. The beams 24 are supported in any suitable manner by means of the hold down rods 18. The particular supporting means 28 shown is the subject matter of my copending application entitled Supporting Structure, Serial No. 142,733 filed October 3, 1961. Since the supporting structure per se has nothing to do with the present application it will not be described in detail. The bricks in arch '6 may be supported from the beams 26 by means of hook rods St) in the usual manner. A plurality of steel wedges 32 are welded to the bottom of the lower flange of each of the beams 24 in spaced apart relationship longitudinally of the beams. Each of the wedges has the usual thick end and thin end connected by a sloping surface extending longitudinally of the span of the arch. Each of the wedges 32 has its thin end on the side toward the crown of the arch with a space being provided between the wedge and the top of the arch. A wedge 34 is associated with each of the wedges 32 and is constructed in essentially the same manner as wedge 32. However, its thick end is located on the side of the associated beam toward the crown of the arch. After the bricks are assembled in rings to form the arch, the wedges 34 are positioned below the wedges 32 and because of the wedge fit the wedges can compensate for irregularities occurring in the arch. Since the thin end of the wedge 34 points downwardly in the direction of the slope of the arch it is impossible for it to become dislodged from its position even if the arch should sag since in such case the wedge 34 would slide or tend to slide downwardly along the lower face of wedge 32.

While one embodiment of my invention has been shown and described it will be apparent that other adaptations and modifications may be made without departing from the scope of the following claim.

I claim:

A furnace roof comprising a refractory arch, a plurality of hold down beams extending transversely of the span of the arch in spaced apart relationship on each side of the crown of the arch, each of said beams having a lower flange spaced from the top of said arch, means supporting each of said beams in a substantially fixed vertical position, a plurality of wedges secured to the bottom of the lower flange of each of said beams in spaced apart relationship longitudinally of said beams, each of said wedges having a thick end and a thin end connected with a sloping surface extending longitudinally of the span of the arch, the thin end of each wedge being located on the side of the associated beam toward the crown of said arch, each of said wedges being so dimensioned as to provide a space between the bottom thereof and the top of said arch, and a wedge in said space associated with each of said first named wedges with its thick end being located on the side of the associated beam toward the crown of said arch, the sloping surfaces of the associated wedges engaging one another and the second named wedge being movable with respect to said first named wedge.

References Cited in the file of this patent UNITED STATES PATENTS 1,563,248 Burroughs Nov. 24, 1925 2,063,748 Olsen Dec. 8, 1936 2,579,447 Boucher Dec. 18, 1951 3,015,288 Hosbein et al Ian. 2, 1962 FOREIGN PATENTS 875,733 Great Britain Aug. 23, 1961 OTHER REFERENCES Heuer, R. P., et al.: The All-Basic Open Hearth European and American. In Journal of Metals, June 1950, pages 824-829,

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