Abstract:
The water wall fit up tool will fit a wide range of tube panel sizes such as ⅞ inch through 3¼ inch tube sizes. It uses the adjacent tubes to force the tube panel into alignment. One unit can fit up two tubes yet can be used in conjunction with two or more tools. The water wall membrane keeps the tubes rigid and the portion of the tube panel where the membrane has been removed allows for movement.

Description:
FIELD OF THE INVENTION 
   The present invention generally relates to a tool for use in clampingly securing the ends of boiler tubes in aligned relation to enable the ends of the boiler tubes to be joined together by welding. More specifically, this invention relates to a boiler wall tube tool in which boiler tubes in the form of a wall can be clampingly secured to retain adjacent ends of the boiler tubes forming the wall in aligned relation when connecting the ends of the boiler tubes forming the wall when being joined by welding. 
   BACKGROUND OF THE INVENTION 
   Tools for clamping and aligning boiler tubes when connecting the ends of the boiler tubes by welding are known as disclosed in prior U.S. Pat. Nos. 4,493,139, 4,579,272 and 4,722,468. The devices disclosed in the above-mentioned patents include structures for securing boiler tube ends in aligned and adjacent relation and function effectively when the boiler tubes are in spaced relation. However, in boiler wall tubes, the boiler tubes are positioned in closely spaced relation and are interconnected by webs to form a continuous boiler tube sheet or wall. The tools disclosed in the above-mentioned patents are not especially adapted for use with boiler tubes forming a boiler wall. 
   Other patents disclosing tools for use with boiler walls include U.S. Pat. Nos. 4,846,931 and 4,936,500. 
   SUMMARY OF THE INVENTION 
   The water wall fit up tool of the present invention will fit a wide range of tube panel sizes such as ⅞ inch through 3¼ inch tube sizes. It uses the adjacent tubes to force the tube panel into alignment. One unit can fit up two tubes yet can be used in conjunction with two or more tools. The water wall membrane keeps the tubes rigid and the portion of the tube panel where the membrane has been removed allows for movement. 
   An object of the present invention is to provide a boiler wall tube tool for clampingly securing adjacent ends of boiler tubes in aligned and adjacent relation when the ends of the tubes are being connected by welding and the boiler tubes form a tube wall in the boiler. 
   Another object of the invention is to provide a tool in accordance with the preceding object which includes a pair of opposed bar members made of 410 stainless steel, for example, to clampingly engage a pair of adjacent ends of boiler tubes of possibly differing diameters and tube spacing to retain them in aligned and adjacent relation with each of the opposed bar members including an area providing access to the ends of the boiler tubes for welding. 
   A further object of the invention is to provide a boiler wall tube tool which includes a pair of clamp members having a bolt passing therethrough for moving the clamp members into clamping engagement with the adjacent ends of boiler tubes. 
   Still another object of the invention is to provide a tool in accordance with the preceding objects in which each of the clamp members includes different radii on opposite sides of the clamping bars. 
   Yet another object of the invention is to provide a tool for boiler wall tubes as set forth in the preceding objects which is simple to use, effective for its purposes and relatively inexpensive to manufacture and maintain. 
   These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  illustrates the opposed clamping bars of the present invention as interconnected by a through bolt passing through each of the clamping bars and including a tethered magnetic plate for securely anchoring the clamping bars to a water wall so as to prevent the clamping bars from falling. 
       FIG. 2  is a transverse sectional view taken substantially upon a plane passing along section line  2 — 2  on  FIG. 1  illustrating the structural details of one of the clamping bars. 
       FIG. 3  is a perspective view of a boiler wall tube assembly with the tool of the present invention installed in operative position thereon. 
       FIG. 4  is a transverse, sectional view taken substantially upon a plane passing along section line  4 — 4  on  FIG. 3  illustrating further structural details of the tool. 
       FIG. 5  is a transverse sectional view taken substantially upon a plane passing along section line  4 — 4  on  FIG. 3  illustrating the 180 degree rotation of the two clamping bars as compared to the clamping bars shown in  FIG. 4  to illustrate a set of water wall tubes of different separation from that shown in  FIG. 4  and the use of a smaller radius side of each of the clamping bars to accommodate a different separation distance of the tubes and to accommodate different tube sizes. 
       FIG. 6  is a side view of an alternate embodiment of opposed clamping bars. 
       FIG. 7  is a transverse, sectional view taken substantially upon a plane passing along section line  7 — 7  on  FIG. 6  illustrating the structural details of one of the clamping bars of the alternate embodiment. 
       FIG. 8  is a transverse, sectional view similar to the views shown in  FIGS. 4 and 5  to illustrate an alternate arrangement of clamping bars for positioning of tube ends. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   In describing a preferred embodiment of the invention illustrated in the drawings, specific terminology will be resorted to for the sake of clarity. However, the invention is not intended to be limited to the specific terms so selected, and it is to be understood that each specific term includes all technical equivalents which operate in a similar manner to accomplish a similar purpose. 
   With reference to the drawings, in general, and to  FIGS. 1 through 3 , in particular, a water wall fit up tool embodying the teachings of the subject invention is generally designated as  10 . With reference to its orientation in  FIG. 1 , the tool includes two clamping bars  12 . The bars are of identical construction and are approximately 5 inches long and approximately one inch to 1 ½ inches in width. Extending through a central bore  13  of each bar  12  is a threaded bolt  15  including a tightening head  17  and a removably secured nut  19 . Bore  13  is ⅜ to 7/16 of an inch in diameter. 
   As shown in  FIG. 2 , the clamping bar  12  includes three portions  14 ,  16  and  18 . Portion  14  is of a semicircular configuration having a radius of 0.5 inches. Portion  18  is of a semicircular configuration having a radius of 0.63 inches. Interconnecting portion  16 , includes straight side walls  16   a ,  16   b  to interconnect the semicircular exterior configuration of portions  14  and  16 . 
   Each of the bars  12  includes a cable tether  20  secured at one end to the bar  12  by set screw locking the cable in a groove in the bar at an opposite end to a magnet  22  or  24 , for example. It is only necessary that one of the bars  12  include a magnet for securing the tool  10  to a water wall since bars  12  are interconnected by bolt  15 . Alternatively, each bar may include a magnet on opposite sides of the water wall. Magnets  22  and  24  are alternative exampels of a magnet configuration which may be used with the present invention. It is understood as being within the scope of the invention that alternate arrangements of a magnet may be used. 
   In  FIG. 3 , a water wall panel  30  is shown comprised of a plurality of tubes  32   a ,  32   b ,  32   c ,  3   d ,  32   e  . . . in opposed relationship with tubes  34   a ,  34   b ,  34   c , . . . At a location spaced from the opposed ends of the tubes  32 ,  34 , adjacent tubes are welded together by weld webs  36 . 
   The opposed ends of the tubes  32 ,  34  are therefore free to move with respect to each other. To correct the misalignment of the ends of the opposed tubes, the tool of the present invention is used to exert side pressure on the ends of the opposed tubes until the ends are in alignment. 
   This is accomplished by placement of a clamping bar  12  on each side of the water wall panel with a curved portion of at least one of the bars tangentially contacting the tubes of the water panel and curving in a direction opposite to a curvature of the tubes for contacting two tubes therebetween. The bolt  15  is then passed through the opposed clamping bars and tightened to draw the clamping bars towards each other. The two clamping bars can be used as a single set or in conjunction with multiple sets of clamping bars to move the ends of the opposed tubes into alignment for subsequent welding. The passage  13  through each of the bars may be cylindrical, with the diameter of the hole being slightly greater than the diameter of the bolt  15 , and due to the absence of threads, allows the clamping bars to shift slightly to accommodate different diameter boiler tubes. 
   In addition, as shown in  FIGS. 4 and 5 , depending upon the placement of the clamping bars between the tubes  32   c  and  32   d , for example, whether larger diameter portion  18  or smaller diameter  14  is used to contact the ends of the tubes, different diameter water wall tubes may be accommodated and moved into aligned position for subsequent welding. When portion  14  of the clamping bars engages the tubes, a ⅞ inch through two inch diameter water wall tube may be aligned into position. However when portion  18  of the clamping bars  12  engages the water wall tubes, a 1.75 to 3.25 inch diameter water wall tube end may be moved into alignment. 
   In an alternate embodiment, clamping bars  40  are configured dependent upon a specific diameter of water panel tubes to be aligned. Larger bars  40  may be used for larger diameter of water wall tubes. In addition, a flat surface  42  is used to seat a bolt head  44  of a bolt  46  as well as provide a seat for a nut  48  as shown in  FIG. 8 . 
   In the embodiment of  FIGS. 6 through 8 , the bore hole through the bars  40  is threaded to ensure a secure connection between the clamping bars  40 . This may be necessary where severe misalignment of the tube ends is present so as to ensure both vertical alignment and axial alignment of the water wall tube ends. The contact of the clamping bars with the tube ends can pull the tube ends together even if the tube ends are divergent at an angle of up to approximately 45 degrees. Alternatively, the bore hole is cylindrical having a smooth side wall as in  FIGS. 4 and 5 . 
   The foregoing description should be considered as illustrative only of the principles of the invention. Since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and, accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the invention.