US1475847A - Roof or floor construction - Google Patents

Description

Nov. 27 1923 1,475,847

f H. E. MARKS I a V1 A f l INVENT/P MKM described Paten Nov. 27, i923.

UNITED STATES I. ERT

E. MARKS, 0F GLEN OSBOBNE, SEWICKLEY, PENNSYLVANIA.

B00? 0B FLOOR CONSTBU'CTON.

l application met December 15,1922. smal n. conoce.

To all whom t may concern:

Be it known that I, HERBERT E. Manns, a

citizen .of the United States, and a residentv of Glen Osborne, Sewickley, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Roof or Floor Constructions, which the following is a specification.

This invention relates to roof or door constructions in which the roof decl: or floor is formed of cementitious material in the form of slabs, preferably pre-cast, and in which a metal mesh reinforcement, or' its equivalent, is embedded in the cementitious material.

The object of the invention is to provide slabs for the purpose stated which cheapen the construction of roofs and floors, which insures that the metal reinforcement can be located well down in the tension zone of the slab but nevertheless completely protected against exposure, which have marked heat insulating properties, ceilings from sweating, and which'are per se waterproof on their upper surface.'

In the accompanying drawing Fig. 1 is a plan view, partly broken away, showing the invention applied to a roof construction; Fig. 2 is a vertical sectional view taken on vthe line 2-2, Fig. 1'; and Fig. 3 is a view of a portion of Fig. 2 on enlarged scale, showing the preferred form of `metal reinforcement.

The drawings illustrate the invention applied to a roof construction, but it can be applied in any exactly similar way to a floor construction. In the drawings 1 represents the main beams of the structure, which in the case of the roof will be the purlins. These may be of any suitable type, either wood or metal, and are illustrated as metal channel beams. 2 indicates the slabs which are shown of a length equal to the distance between adjacent purlins and are supported at their ends u on the purlins, but which may be of any esired size and supported in any desired way. These slabs are formed of three parte, to-wit, a lower facing portion 3, preferably formed by the well known plaster or gypsum board, a member or body portion 4, formed of a material hereinafter and the metal reinforcement 5 embedded in the body 4 near its lower surface and well do in the tension zone of the slab.

.proximately 10% thus preventing the a suitable bitumaterial, or so either artiicial,

The body 4 is formed of mastic (bituminous mastic) called bitulithic concrete, that is, formed by mixing together asphaltum with a suitable aggregate, such as sand, pebbles, or broken stone, in suitable proportions, but which preferably will be the natural rock asphalt found in many parts of the count an which comprises the natural mixture o sand and a small percentage, ap-

of asphaltum.

These slabs will be formed in suitable molds', preferably by a cold-pressing operation, although if desired the broken up rock asphalt may be mildly heated before molding. The molding operation will be performed in well known molding ways, by placing in the mold the plaster board, the metal reinforcement, and the bitumastic material in proper relation to each other and then applying pressure to densify the bitumastic material and thoroughly bond the material together. Preferably a thin layer 9 of hot asphalt will be applied between the plaster board and the bitumastic material, in order to secure a stronger bond between the plaster board and the body of the slab. When thoroughly pressed the parts unite so thoroughly as to form substantially an integral slab. The plaster board need not be placed in the bottom of the mold, but the body of bitumastic material first formed therein under pressure and the face of plaster or gypsum formed thereon by pouring the gypsum up to the top of the mold, or the plaster board attached to the top of the body by means of the binder, in either case the entire mass being thoroughly bonded together so as to form a substantially monolithic structure.

The metal reinforcement may be of any kind, but is illustrated of a construction shown in and claimed in an application of even date herewith, Serial No. 607,019, and comprising an electrically welded fabric composed of longitudinal or strand wires or rods 6 and transverse wires or rods 7 welded together at their crossing points, and so located in the slab that at one end thereof a transverse wire or rod 7 is outside of and spaced from the end of lthe slab, while at lthe opposite end of the slab the longitudinal thereof members 6 roject beyond the en the slam a suitable d1stance, so that when or concrete upon the body lll@ The slab described is per se Waterproei? end needs no lweterprooling coating applied to its top surface. llt is substantially monolithic sieb, The plaster on the under v surface imparts heat insulating properties to the slab end prevents the ceiling from sweating., ln addition, it insures that the metal reinforcement Wili not loe exposed on lower face of the slolo even though seid reinforcements lie located Well down toward the lower surface of the bitumastic loody.

The construction described is cheep on ac eount of the eheapness of vdie material used. which in its preferred form is e natural rock which needs only to be crushed, and needs noheating to mold it into the slab, although a moderate heating may be resorted to, if desired? out will not materially add to the cost. When erticial bitume-.Stic materiel is employed ti e percentage of loituminous constituent will be low, approximately that of the natural rock asphalt. rlhe slab is strong, has good weathering proper- 'ties and because of the low bituminous content forms e ver' strong compression meniloer with substantially no slippage factor; and this enables the metal reinforcement to effectively strengthen the slab. lrts natuy rel yf/aterproofing qualities melies it unneeessary to add the usuel suris r1on l., A for roof or door constructions comprising a plaster or gypsum looei'd forming1 its lower Jfece, a material molded thereto and integral thereA with,

2. slab :for roof or door constructions comprising e plaster or gypsum board forming its lower :aee9 e body of bitumastio ineteiial, and en interposed bituminous bond ing luyen l 3. A slab for root or oor constructions comprising a lbody of bitumestic materiel, o, metal reinforcement emioedded in seid. loody in the tension zone thereofs end a lower faeing loonded seid loooly endlof'a material non-adherent to the mold for forming the sleb. i

du slee for roof or door constructions comprising o bitunestic body, a motel reinforcement embedded therein and located iu its tension Zone, e lower eeing; united to seid body by an interposed bituminous -loonding layer end of' e material non-adherent to the mold in which the slab is formed. A slab for root oe floor constructions comprising e plaster or gypsum board forming its lower :facing5 e bonding coating of bituminous material applied thereto, and e body of leituniostio materiel molded under pressure to nlastee or gypsum board.

ln testimony whereof, Ti sign my name,

nd e body of bitumastic`

Images