US1765558A - Method of repairing furnace linings - Google Patents

Description

June 24, 1930. .1. E. ANDERSON 1.765,558

METHOD OF REPAIRING FURNACE LININGS Filed Nov. l, 1926 Patented 24, 193@ TENT JOHN E. ANDERSON, F CHICAGO, ILLINOIS, ASSIGNOR TO PLIBRICO JOINTLESS FIREBRICK COMPANY, OF CHICAGO, ILLINOIS, ,AA CORPORATION OF ILLINOIS Applicationnled November 1, 1926. Sierial No. 145,483;

This inventionrelates to furnace construction, and more particularly toa method of and means for repairing or patching refractory linings used in furnaces.

i It very frequently happens that defectsv in the l'ning of the furnace necessitate the removal of the defective portions and the consequent repair or patching of the lining. It also happens that the lining is injured by removal of clinkers therefrom or, in some cases, by the slice bars used in conditioning the fire. In all such cases, it becomes necessary to remove. the defective portion, or the injured portion of the lining and replace the same by patching. `Great difficulty is frequently experienced in securing the patch in such manner as to effectually anchor it to the main or-body portion of the lining and this results in a serious weakness in the lining as a whole. This is particularly true where the lining is of monolithic construction as, in such case, the material of the patch cannot be readily bonded with the lining so as to form an integral part thereof.

I have found that the above objections can be overcome by providing suitable anchoring members which engage between the furnace wall and the lining, these members extending into the opening for receiving the patch and being embedded in the material of the patch, thus effectually anchoring the patch to thelining. yOne of the main objects of the invention is to provide a methcd and means of the character stated whereby ak patch can be r readily applied to a monolithic furnace construction at small cost and can be effectually anchored in position so as to form, in effect, an integral part of the main portion of the lining. A further obj ect is to provide anchor f4() members which can be readily produced at small cost and can be readily appliedy between the lining and the furnace wall in position to become embedded in the material of the patch. v'Further objects will appear from the detail description.

In the drawings Figure 1 is a fragmentary vertical sectional View through a furnace wall construction showing the wall and the lining, including the patch, in section and also showing two of the anchor members as applied;

Fig. 2 is an inner face view of the wall structure looking at the lining, the patch being indicated and the anchor members being shown in dotted lines; f

Fig, 3 is a detail perspective view of one ofthe anchor members.

The method and means of my invention are particularly adapted for use in connection with a furnace construction including a brick Wall l of known construction provided on its inner face with a lining 2 of refractory material, though it is to be understood that the method andfmeans referred to for effecting repairs or patching of the structure can be applied to furnace wall constructions' of various types.

In the particular construction illustrated, the lining 2 is of monolithic construction being formed ina continuous sheet or layer built up from refractory material applied vto the inner face of the wall in a plastic condition. In practicing my method cf repairing the lining, in the event that a defect develops in the lining or the lining is injured, this defective or injured portion is removed by cutting an opening in the lining extending from the inner face thereof to the wall l, this opening being preferably rectangular in outline and the wall surrounding the opening being :j I,

disposed at right angles to the wall 1. It will be understood, however, that the opening formed for receiving the patch may be of other shape than rectangular if desired or if required by circumstances. After the opening for reception of the patch has been formed, anchor members 3 are secured in position to extend into the opening so as to be embedded in the material of the patch Il. Each of the anchor members 3 is of approx- Y imately Z-shape and is formed from a single length of strap steel or other suitable material which is bent to provide the shank portion 5 and the terminal elements 6 which are disposed at right angles to shank 5 and are oppositely related. Preferably the elements 6 and shank 5 are all of the same length rendering it possible to produce the anchor at very small cost. In applying the anchor, one of the arms 6 is driven between wall 1 and the lining 2. Preferably the element 6 is driven between the wall and the lining to its full length so that the shank 5 bears against the lining 2 and is braced thereby against movement outwardly of the opening, laterally thereof. With the anchor 3 disposed in this manner, the shank 5 extends into the opening from wall l and the other terminal element or arm 6 extends into the opening of the patch at right angles to lining 2, that is in the plane of the patch 4.

After the opening has been cut through the lining 2 and the anchor has been properly positioned, in the manner stated, the material of the patch 4 is placed in the opening to form the patch. This material is preferably similar to the material of which'the lining 2 is formed and is applied in a plastic conditiom,

being firmly pressed and packed into the opening so as to completely fill the same and completely surround and enclose the shanks 5 and inner elements 6 of the anchors. The anchors are thus efect-ually embedded in the patch 4 and serve to anchor the same tightly in position so as to foim, in effect, an integral part of the lining 2. Vhen thoroughly dried and vitrified, the patch 4 becomes united with the lining so as to avoid any undesirable crack or opening about the lining, which would ei-*entually develop a Weakness in the same, and expansion and contraction of the patch occurs simultaneously with expansion and contraction of the main portion of the lining 2. As stated, the patch 4 is preferably formed of the same material as lining 2 and is, therefore, of monolithic construction, though other suitable materials may be used for the patch. Where some material other than that of which the lining 2 is formed is employed forv the patch 4, and the rate of expansion and contraction of the material of the patch is materially different from the expansion and contraction of the lining 2, it may be desirable to space the shaiiks 5 of the anchors 3 away from the surrounding wall of the openings Which receive the patch to accommodate, to a certain extent, this difference in expansion between the patch and the lining, as well as the difference between contraction of the patch and the lining. Under ordinary conditions, however, the anchor members are disposed with the shank portion 5 thereof closely adjacent the surrounding wall of the patch receiving opening. I contemplate disposing the anchor members with the Shanks thereof away from the Wall of the patch receiving opening, however, when this seems desirable or necessary.

What I claim' is l. A method of repairing a lining in a furnace construction including a wall and a lining therefor, consisting in removing the defective or damaged portion of the lining and forming anvopening extending from the inner face of the lining to the wall, inserting anchor members between the wall and the lining and disposing such members to extendmto the opening, and then filling the opening With material forming a patch and enclosing. and

surrounding the anchor members sopas to embed the same in the patch. l

2. A method of repairing a lining in a furnace construction including a wall and a lining therefor, consisting in removing the defective or damaged portion of the lining and forming an opening extending from the inner face of the lining to the Wall, inserting to extend into the opening, Aand then filling the opening withv plastic material forming a monolithic patch, the anchor members being enclosed by and embedded in the'patch.

4. A method of repairing a furnace Wall structure consisting in removing the defective or damaged portion of the structure to form an opening extending from one face thereof, positioning anchor members in the opening with elements thereof secured between the thickness of material corresponding to the depth of the opening and the remaining thickness Vof the structure, and then filling the opening with material forming a patch, theY anchor members being enclosed by and embedded in the patch. K

5. A method of repairing a furnace Wall structure consisting in removing the defective or damaged portion of the structure to form an opening extending from one face thereof, positioning approximately Z-shap`ed anchor members in the opening With their' outer terminal elements inserted between the thickness ofthe structure corresponding to the depth of the opening and the remaining thickness of the structure, and then filling the opening with material forming' a patch, the anchor members being enclosed by and embedded in the patch.

6. A method of repairing a lining in a furnace construction including a wall and alinizo ing therefor, consisting in removing the defectve or damaged portion of the lining and forming an opening extending from the inner face of the lining to the Wall, driving the outer terminal elements of anchor members between the Wall and the lining about the opening and disposing said anchor members to project into the opening, and then filling the opening With the material forming the patch, the anchor members being embedded in the patch.

In Witness whereof, I hereunto subscribe my name this 29th day of October, 1926.

JOHN E. ANDERSON.

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