A treatise on architecture and building construction . gles ^<:/,r iron bar could hardly be expected to prevent this, as itwould probably bend away from the timber between thebolts, and a square butt end, as above described, should, insuch a case, be used. In this joint the keys r, s must bedriven with caution, as the least overdriving would tend tosplit the timber on the line dx or ex. 99. vShrinkage in the material in this joint would firstcause it to open slightly on the line de\ then, if the timberwere under compression, this would be compensated by thesliding of the two pie
A treatise on architecture and building construction . gles ^<:/,r iron bar could hardly be expected to prevent this, as itwould probably bend away from the timber between thebolts, and a square butt end, as above described, should, insuch a case, be used. In this joint the keys r, s must bedriven with caution, as the least overdriving would tend tosplit the timber on the line dx or ex. 99. vShrinkage in the material in this joint would firstcause it to open slightly on the line de\ then, if the timberwere under compression, this would be compensated by thesliding of the two pieces into close contact again, and theconsequent loosening of the keys r, s\ but if the timber weresubjected to a tensile strain, the joint would remain open onthe line de until the keys r and s were driven tighter to closethe joint, and the bolts in were tightened to hold it in placeafter the shrinkage had been taken up. 100. Fig. 25 is a modification of Fig. 24, in having theline de continuous and passing it through the center of the 48 CARPENTRY. 9. Fig. 25. keyway r s, and also in having the meeting line of the two timbers cut at an obtuseangle c Jig. This rendersthe beam much morereliable under a cross-strain tending to bend itin the direction of itswidth, and the pointedtoe also tends to keep thetimbers flush. Like , this joint is bettersuited to a tensile than compressive strain, but its behaviorafter shrinkage is more like that shown in Fig. 23. If used ina position where it will be subjected to a transverse strain, itshould have the upper half prepared as described in Art. 98. 101, A method of lengthening timber and preserving aconsiderable degree of strength, both for longitudinal andfor transverse strains, is shown in Fig. 26. Three thicknessescr, /;, and c of thesame size of timberare bolted togetherwith four bolts in,the joints fg andJi de being squarelysawed and tightlybutted, in order to secure a good bearing. The bolts mustfit the holes exactly, and the nut
Size: 1995px × 1253px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, booksubjectarchitecture, booksubjectbuilding
