US2753711A - Method of constructing furnace arches - Google Patents

Description

uly 10, 1956 H. G. o. WEBER 2,753,711

METHOD OF CONSTRUCTING FURNACE ARCHES Filed Jan. 7, 1949 v3 Sheets-Shut 1 Fl 6 .L h

FIGS I I -ve- Fol? July 10, 1956 H. s. o. WEBER METHOD OF CONSTRUCTING FURNACE ARCHES 3 Sheets-Shem 2 Filed Jan. 7, 1949 FICA IOb INV ron 13m A-TT VPK/Ey July 10, 1956 H. G. o. WEBER METHOD OF CO'NS'IRUCTING FURNACE ARCHES 3 Sheets-Sheet 3 Filed Jan. 7, 1949 lllll- IIL FIGJO li'wduy AQMzhfQmZdAJ INVENTQ Q AT FORD/E METHOD OF CONSTRUCTING FURNACE ARCHES Hendrik G. 0. Weber, Driehnis, Netherlands Application January 7, 1949, Serial No. 69,649

Claims priority, application Netherlands January 20, 1948 2 Claims. (Cl. 72-55) The arches of industrial furnaces are usually composed of tapered refractory bricks, that are assembled in rows or rings on a wooden form, with the continuous joints perpendicular to the longitudinal axis of the furnace.

If such an arch must be totally or partially renewed, it is necessary to stop the production process and the furnace must be cooled down, before the form can be erected and nited States Patent the arch can be constructed, after which the form must be removed.

Also for smaller repairs it is usually necessary to wait until the furnace is sufficiently cooled down.

However, it has already been proposed to perform smaller repairs during the production process by inserting a steel plate through the opening of the arch to be repaired, which plate is suspended from the framework of the furnace by means of iron wires.

The bricks are placed on this plate for initial support until the bricks have been properly placed in the arch.

Eventually the plate melts away or is dropped into the furnace.

It now often occurs that during the placing of the bricks the plate will warp or that the wires will melt away.. In

the first case the bricks cannot be properly placed, in the it second case the bricks willdrop into the furnace and in both cases the operation must be repeated.

Owing to the adverse conditions under which the work must be done it is always a diflicult job, taking up. much time.

The principal object of the invention is to remove the above-mentioned disadvantages and to provide improved methods and means for easily constructing or repairing said furnace arches in a short time.

Another object of my invention is to make the use of wooden forms superfluous and to provide for means enabling the repair of an arch without it being necessary to interrupt the production process.

With the above and other objects in view, the invention consists in certain novel and useful features and com binations as hereinafter described and claimed; and in order that it may be fully understoodreference is to be had to the accompanying drawing, in which:

Fig. 1 is a partial front view of a supporting beam, which is used in my new method. 7

Fig. 2 represents a top view of said beam.

Fig. 3 is a cross-section of said beam, on an enlarged scale, with a part of the arch.

Fig. 4 isa perspective view of'an improved carrierbrick.

Fig. 5 is a perspective view of an improved filler-brick,

. used in combination with said carrier-brick.

Figs; 6 and 7 are longitudinal sections of thearch, showing different combinations of rings of carrier-bricks and ing how the beam is adjustably supported, portions being shown in section.

Fig. 12 is an enlarged section taken approximately on the line 1212 in Fig. 2.

Referring to the Figures 1, 2 and 3, the supporting beam 1 used for the support of the carrier bricks 2, which bricks will be described hereinafter, mainly consist of two parallel, curved plates 3, 4, which are interconnected by a plurality of spacing devices 5 for varying the distance between them. Each of the said plates is provided with an inturned lower flange 6 for supporting the carrier bricks 2 (Fig. 3) and an outturned upper flange 7.

In the middle of the beam 1 the flanges 6 have been cut away along a certain distance (B in Figs. 1 and 2), for enabling the insertion of the last brick closing a ring, as will be described hereinafter, the flanges 6 and the flanges 7 along the top of the beam also provide for the required rigidity of the beam.

The beam is usually placed on that part of the frame of the furnace, in which the usual skew blocks 8 are supported, to wit on the longitudinal girders 9.

At each end, the supporting beam 1, comprising the two plates 3 and 4, is provided with an adjusting shoe 10 which is fixed to the plate 4 and slidably supports the plate 3 to permit the plates to be moved toward and away from one another when the spacing devices 5 are actuated. Each of the shoes 10 is shown as a transverse angular member which is welded to the plate 4 and comprises a vertical flange 10a and a horizontal flange 10b on which the end portion of the plate 3 rests. A stop pin 12 fixed to the plate 3 extends through a slot 12a in the shoe 10, thereby limiting the relative lateral movement of the plates 3 and 4.

The adjusting shoes 10 are provided with adjusting bolts 11 for adjusting the supporting beam 1 in a vertical direction and for lowering the beam to disengage it from the bricks after an arch of carrier bricks 2 has been closed. The bolts 11 extend down through threaded holes in the horizontal flange 10a of each shoe and engage a carrier plate 13 slidably resting on the upper flange 9a of the respective girder 9. Each carrier plate 13 has a downwardly extending longitudinal lip 13a engaging the edge of the flange 9a to guide the carrier plate on the girder and is provided on its upper face with two transverse adjusting strips 13b and 13c and a transverse abutment strip 13a. The strips 13b and 13c are engageable by the lower endportions of the adjusting screws 11 to limit lateral movement of the beam 1 on the carrier plates 13. The

. strips 13b and l3d are engageable by the lower end portion of thestop pin 12 to limit relative lateral move ment of the plate 3. It will be seen that the beam 1 is adjustable vertically by means of the bolts 11 and is adjustable laterally by movement of the shoes 10 relative to the carrier plates 13, or by sliding the carrier plates longitudinally on the girders 9 on which they rest. Relative lateral movement of the plates 3 and 4 of beam 1 by means of adjusting devices 5 is permitted by the sliding support of plates 3 on shoes 10 fixed to the end portions of plates 4.

Fig. 3 shows the details of the spacing device 5 for enlarging the distance between the plates 3 and 4 and for interconnecting said .plates.

Each device comprises a screw spindle 14 with left handed and right handed thread.

Internally threaded bushings 15 are welded to connecting plates 16 .and these plates 16 are attached to the curved plates 3 and 14 by bolt or screws. Dividing or separating lrings; 17 are-placed on .the screw spindle 14 and arebolted ment and stop pins 18a are used in regulating the spacing of the plates 3 and 4. The bushings also protect the screw spindle 14.

By means of a rod 19 the screw spindle can be rotated.

The supporting beam as described is used in combination with carrier bricks and filler bricks, preferred embodiments of such bricks being designated in the Figures 4 and Fig. 4 shows the carrier brick 2 in a perspective view. This carrier brick is higher than the filler brick 20 (Fig. 5), an assembled ring of said carrier bricks forming a strong ring for supporting rings of filler-bricks.

The carrier brick is tapered in the transverse direction, the top surface being thicker than the under surface. In the small sides of the carrier brick recesses 21 have been made, forming supporting flanges 22 at the top of the brick and shoulders 23 sloping upwardly below said flanges.

The filler brick 20 according to Figure 5 is provided with a shoulder 24 substantially perpendicular to the longitudinal axis of the brick at one of its small sides, the other small side being provided with a corresponding recess 25. The longitudinal dimension of the recess (C) is larger than the longitudinal dimension of the shoulder (D).

Having now described the principal elements needed for the application of my improved method, this method will be further elucidated with the aid of the Figures 1, 2, 3, 6 and 7.

Firstly the carrier plates 13 are fixed on the girders 9 and the supporting beam 1 is adjusted at the required height by means of the screw bolts 11, after which the carrier bricks 2 are placed. These carrier bricks are inserted through the open top of the supporting beam 1 and are turned between the flanges 6, until they are supported thereon. The closing brick of the ring formed by the carrier bricks is not turned and is inserted through the opening between the flanges 6 (B in Figs. 1 and 2).

However, if desired, all carrier bricks may be inserted through this opening B and be pushed sideways into their proper places.

Fig. 3 also shows that there is some play between the carrier bricks 2 and the supporting beam 1, enabling a correction of the direction of the joints.

After having constructed a complete ring of carrier bricks 2, which ring is now self-supporting, one or several rings of filler bricks 20 are hooked onto this ring at one or at both sides of the ring.

The supporting beam 1 is now lowered by means of the adjusting bolts 11 and the plates 3, 4 are separated from each other by means of the spacing devices 5, the pins 12 stopping the beam in the required position, so that it can be now removed from the ring and be adjusted over the next section of the arch to be constructed or repaired.

It is obvious that a plurality of supporting beams may be simultaneously used for simultaneously constructing difierent sections of the arch.

Fig. 6 is a longitudinal section of an arch constructed in accordance to my method, the arch being formed by assembling a certain number of independent groups, each group 40 consisting of a ring of carrier bricks 2 with at both sides a certain number of rings of filler bricks.

As a result of the dimensioning of the shoulders and the recesses of the bricks (Fig. 5), grooves 41 are formed between the rings, which are filled up with mortar, so that the arch will be absolutely gas-tight. The arch is completed by inserting the filler blocks 42.

Fig. 7 shows a modification of the arch according to Fig. 6 with groups 40, each consisting of a ring of carrier bricks 2 with three rings of filler bricks 20 at one side of the carrier-ring.

Fig. 8 is a longitudinal section of an arch constructed according to my method, with an inclined part, showing the application of slightly modified carrier bricks 2a and filler bricks 20a.

In the Figures 9 and 10 two methods are shown for the reparation of a section of an existing arch with the aid of the supporting beam and of the carrierand fillerbricks. The repaired part of the arch is indicated by the dashed lines.

It will be appreciated that the existing arch is not loaded at all during the repair.

I claim:

1. A method of constructing or repairing a furnace arch formed from arcuate rows of tapered bricks lying in planes perpendicular to the longitudinal axis of the furnace, comprising the steps of placing over the section of the arch to be constructed a beam formed from two laterally spaced apart and laterally separable elements, adapted to support a plurality of carrier bricks in depending relationship, hanging carrier bricks with laterally undercut or shouldered heads in said beam until a complete, self supporting arcuate row of said carrier bricks is obtained, hanging at at least one side of the finished arcuate row of carrier bricks a plurality of filler bricks constructed for interlocking engagement with the row of carrier bricks and with one another, removing the supporting beam from the finished row of carrier bricks without disturbing said bricks, positioning the said supporting beam over the next section of the arch to be constructed, and repeating the aforementioned steps.

2. A method of constructing or repairing a self-supporting arch of a furnace, formed from interlocking arcuate rows of tapered bricks, each ring lying in a plane perpendicular to the longitudinal axis of the furnace, comprising the steps of placing over the section of the arch to be constructed a beam formed from two laterally spaced apart and laterally separable elements, adapted to support a plurality of carrier bricks in depending relationship, inserting carrier bricks having laterally undercut or; shouldered heads through the top side of said beam, with the largest dimension of said shoulders in the longitudinal direction of the beam and subsequently turning said bricks at right angles for engagement with said beam, completing an arcuate row of carrier bricks by inserting a last carrier brick without turning said last brick, subsequently hanging at at least one side of the now selfsupporting arcuate row of carrier bricks a plurality of rows of lower filler bricks, constructed for interlocking engagement with said self-supporting row of carrier bricks and with one another, removing the supporting beam from the finished row of carrier bricks without disrupting said bricks, placing the temporary supporting beam over the next: section of the arch to be constructed, and repeating the aforesaid steps.

References Cited in the file of this patent UNITED STATES PATENTS Re. 15,977 Kanagy et al. Jan. 6, 1925 510,610 Olsen Dec. 12, 1893 1,440,446 Cotton Jan. 2, 1923 1,571,561 Stevens Feb. 2, 1926 1,606,296 Himmelright Nov. 2, 1926 1,773,359 Hilliard Aug. 19, 1930 1,824,222 McLimans Sept. 22, 1931 2,167,413 Bartlett July 25, 1939 2,186,521 Cash Jan. 9, 1940 2,264,551 Rateau Dec. 2, 1941 2,288,365 Moths June 30, 1942 2,386,161 Hawes Oct. 2, 1945 2,465,170 Rochow Mar. 22, 1949

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