448

PRACTICAL CONSTRUCTION.

1598. Fig. 829 shows a form of saddle for joining a beam a, which crossesanother beam b b. The strap c c is bolted to the beam b b by the bolts d ande ; ff is a plan.

Fig . 82S.

IRON STRAP TOR 8TRAINISO-UBAW, Q0EKN-PO8T. ANT3FKOT-30ALE, ^ INCH TO TDK FOOT.

Fig. 829.

Fig . S31.

1599. Iron Shoes for Wooden Framing. —In fig. 830 we give a drawing of acast-iron shoe, for the reception of the end of tie-beams or girders, as a. Theshoe is provided with snugs c e, f d, which act askeys, and give a secure hold in the wall b. A shoe forthe reception of joists which require to be bolted towooden columns, &c., is given at e d f in fig. 831 :this is secured by bolts and nuts as shown at f. Inthe same figure a shoe for the reception of “ wall-plates,” running along the wall, is shown. The -wall-plate rests in the recess a ; c and a are projections. Thismaybe adapted to secure to a post, &c., as the shoecast-iron 8hor .on rhgeivincj end of e d f hy extending the projection c, as shown in form

OIRUKH—SCALE, A- INCH TO TUB POOT. , 7 , . , , » ,

towards 0 , and passing bolts through apertures madein it; the upper bolt-hole at a will require to be counter-sunk, or have a recess

in which the head of the bolt can go. This willallow it to lie flush with the inside of the recess,and the wall-plate to pass easily into the recess a.A front view is shown at g.

1600. In composite roofs—that is, roofs com-posed partly of iron and partly of timber—certainparts are composed of cast-iron, as queen-bolt-heads, shoes for braces, struts, or tie-beams, andpurlin-boxes, &c. These we now propose to illus-trate.

1601. Fig. 832 illustrates a “ shoe ” for the re-ception of the foot of struts : a a is the wooden tie-beam, b b the wrought-iron king-bolt, secured bynut and washer c ; d the extremity of strut orbrace, butting in the shoe, the section of which isformed of the proper shape ; / shows the elevation

of the shoo : an aperture is cast in the solid part of the shoe, through whichthe king-bolt is passed ; e e are bolts fastening the shoe f to the tie-beam a a.

CAST-IRON 8UOZ8 FOR "JOISTS, ’ " WALL -PLATES "—SCALE, INCH TO THE FOOT.