A treatise on architecture and building construction . 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 prepari
A treatise on architecture and building construction . 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 Fig. 57. 145. Fig. 57 shows how a wall is held up by needles inorder that a new wall may be built under the upper portion,or columns and girders placed to support it. ^ 78 MASONRY. § 7 At a are shown the holes in the wall, cut at intervals toreceive the needles b\ these needles consist of heavy tim-bers to. carry the upper wall c. Where the needle entersthe hole in the wall, small cross-beams d are laid on theupper side, and wedged in with oak or iron wedges, asshown at i\ in order to secure a larger and more even bear-ing on the wall. At the inner and outer ends of the needles,heavy perpendicular timbers f are placed to support theneedles and carry the weight of the wall. The foot orground bearing of these timbers is formed by three coursesof heavy plank, shown at g^ crossing each other at rightangles to spread the weight over more surface. Wedges//, // are driven under the foot of each upright, forcing theends of the needles up until they show a slight downwarddeflection, or bendin
Size: 1536px × 1627px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, booksubjectarchitecture, booksubjectbuilding
