A treatise on architecture and building construction . upby means of screw jacks, in-stead of the wedges el, they areknown as pumps. The lowerends of the shoring timbers reston a timber crib c, supported onthe ground. At least two sets of3 braces are usually put in, oneto support the wall, as low downas possible, and the other placedhigher up, to keep it frombulging. The platform mustbe made large enough to dis-tribute the pressure broughtupon it over the ground, and the shores should be wellwedged with iron or oak wedges, as shown at d. The tim-bers carrying the ends of the braces should be a
A treatise on architecture and building construction . upby means of screw jacks, in-stead of the wedges el, they areknown as pumps. The lowerends of the shoring timbers reston a timber crib c, supported onthe ground. At least two sets of3 braces are usually put in, oneto support the wall, as low downas possible, and the other placedhigher up, to keep it frombulging. The platform mustbe made large enough to dis-tribute the pressure broughtupon it over the ground, and the shores should be wellwedged with iron or oak wedges, as shown at d. The tim-bers carrying the ends of the braces should be adjusted, tothe proper inclination by means of wedges, as shown at e. Itis customary to allow a space of about 5 feet between braces,and all piers and chimneys should be separately shored. The foundations should be removed in small portions at atime. When three sets of braces, or shores, are in placethe wall should be underpinned, as hereafter described, afterwhich the shores over it may be moved along; two sets,however, must always be kept in Fig. 56. 143. Shoring is often resorted to when it is neces-sary to hold up the corner of a building, to build a pier, §7 MASONRY. 11 or set a column under it. When a girder is placed underthe upper part of a wall, needling is necessary, as being-attended with les^ risk. NEEDLING. 144. When a wall already built is supported on beamsor needles placed transversely through holes cut in the wall,as shown at b^ Fig. 57, and supported at each end by posts,jack-screws, orpiivips, as shown at/, it is said to be needled;and the operation of preparing it is called needling-.
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Keywords: ., bo, bookcentury1800, booksubjectarchitecture, booksubjectbuilding
