Column hung shoring bracket and slab support truss system

Abstract

A column mounted shoring bracket has a support sub-assembly attached to a column or other supporting surface, a jack sub-assembly attached to the support and a head sub-assembly attached to a part of the jack that varies in height relative to the support. The head has a head base that supports one or more rollers for moving a form. The head also has a supporting plate for supporting the form. The supporting plate is connected to the head base so that it may be slid upwards and fixed in a position where the top of the supporting plate is above the top of the rollers, for example to carry the weight of a slab being built, or slid downwards so that the top of the supporting plate is below the top of the rollers which do not have to carry the weight of the slab being built. The angular position of the rollers may be aligned with an external reference such as the side of a column, a wall, or a jig. The bracket is adapted for use with parts of forms that may be made or assembled in or adjusted between a set of widths within a range that differ from each other by a selected increment. The forms include structures for spanning between shoring brackets or other supports that can be pre-cambered so as to have acceptable deflection when loaded.

1 . A head for a shoring device comprising, 
 (a) a head base supporting one or more rollers, the rollers adapted to support a form while moving the form into or out of a position over the shoring device;    (b) a supporting plate for supporting the form when it is in the position;    (c) a vertically slidable connection between the supporting plate and the head base,    wherein the supporting plate may be slid upwards and fixed in a position where the top of the supporting plate is above the top of the rollers or slid downwards so that the top of the supporting plate is below the top of the rollers.    
   
   
       2 . The head of  claim 1  wherein the vertically slidable connection includes, 
 (a) a supporting plate element extending downwards from the supporting plate;    (b) a head base element extending upwards from the head base; and,    (c) a tapered member,    wherein the supporting plate element and head base element are each provided with one or more holes which can be aligned horizontally to accept a wider portion of the tapered member and wherein the variation in size of the of the tapered member from the wider portion to a narrower portion is sufficient to cause the top of the supporting plate to move between positions above and below the top of the rollers when the tapered member is moved horizontally into or out of the holes.    
   
   
       3 . The head of  claim 2  herein the supporting plate element and head base element have horizontal cross-sectional shapes that may slide vertically one within the other, but which inhibit rotation of one relative to the other in a vertical plane or inhibit movement of one horizontally relative to the other.  
   
   
       4 . The head of  claim 2  wherein the inner horizontally dimensions of a vertically extending cavity horizontal of one element are slightly larger than the outer dimensions of a horizontal cross-section of other element.  
   
   
       5 . The head of  claim 4  wherein the shape of the vertically extending cavity and the horizontal cross-section of the other element are both rectangular or such that one will not rotate within the other.  
   
   
       6 . A head according to  claim 1  having an alignment tool for aligning the angular position of the rollers in a horizontal plane with an external reference.  
   
   
       7 . The head of  claim 6  wherein the external reference is any one of a column, wall, jig or sight line between columns or walls.  
   
   
       8 . The head of  claim 1  having guides mounted to the head so as to provide bearing surfaces above and on opposed sides of an upper surface of the supporting plate, the horizontal distance between the guides being sufficient to admit a portion of the form.  
   
   
       9 . A shoring apparatus with a head according to  claim 1  comprising, 
 (a) a support for attaching the shoring bracket to a column or other supporting surface of a structure being constructed:    (b) a jack attached to the support and having a portion with variable height relative to the support; and,    (c) a head according to  claim 1  attached to the portion of the jack with variable height.    
   
   
       10 . The shoring apparatus of  claim 9  having an alignment tool or bracket for aligning the angular position of the rollers in a horizontal plane with an external reference.  
   
   
       11 . The shoring apparatus of  claim 10  wherein the external reference is any one of a column, wall, jig or sight line between columns or walls.  
   
   
       12 . The shoring apparatus of  claim 9  wherein the jack may be prevented from rotating, the head is fixable but rotatable in a horizontal plane relative to the jack and having an alignment tool or bracket communicating with the head for aligning the angular position of the rollers in a horizontal plane with an external reference.  
   
   
       13 . The shoring apparatus of  claim 9  wherein the attachment between the head and the jack is pivotable.  
   
   
       14 . The shoring apparatus of  claim 9  wherein the attachment between the head and the jack is pivotable about an axis parallel with or perpendicular to the one or more rollers.  
   
   
       15 . The shoring apparatus of  claim 9  wherein the jack is a screw jack with a screw jack shaft slidable within a bore and screw jack nuts on opposed sides of the bore.  
   
   
       16 . A shoring apparatus comprising, 
 A) a plurality of shoring brackets mountable in opposed sets, each set attached to opposed lines of columns or other supporting surfaces and each having, 
 (a) a support for attaching the shoring bracket to a column or other supporting surface;  
 (b) a jack attached to the support, the jack having a portion with variable height relative to the support;  
 (c) a head attached to the portion of the jack with variable height and having a supporting plate for supporting objects above the head; and,  
   B) one or more forms, supports for forms or spanning structures that can be made or assembled in a set of widths within a range that differ from each other by a selected increment, and having members which rest on the supporting plate of the head,    wherein the jack may be attached to the support in at least two positions, the two positions being spaced horizontally in the direction between the opposed sets of shoring brackets by one half of the increment,    and wherein the supporting plates of the head are wider than the members which rest on the supporting plate by at least one half of the increment horizontally in the direction between the opposed sets of shoring brackets.    
   
   
       17 . The shoring apparatus of  claim 16  with a head according to  claim 1 .  
   
   
       18 . The shoring apparatus of  claim 17  wherein the attachment between the head and the jack is pivotable.  
   
   
       19 . The shoring apparatus of  claim 18  wherein the attachment between the head and the jack is pivotable about an axis parallel with or perpendicular to the one or more rollers.  
   
   
       20 . A shoring device comprising, 
 (a) a head base;    (b) a supporting plate adapted to support a from or other structure to be shored;    c) a first lifting mechanism for alternately lifting or lowering the supporting plate relative to the head base;    (d) a support for attaching the shoring device to a supporting surface; and,    (e) a second lifting mechanism for alternately lifting or lowering the head base relative to the support.