US1496819A - Method of forming reenforced concrete structural members - Google Patents

Description

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' VV. MITCHELL METHOD OnF--FORMING REENFRCED CONCRETE STRUCTURAL XIIM'MIHIS4- june 10 W. MITCHELL METHOD OI'F FORMING REEIl"l}?ORCEDv CONCRETE STRUCTURAL MEMBERS Filed April 2, 1919 2 Shoots-Skiset. 2

atto/Wsw Patent .lune l, i924.

WIL MITCHELL, OF DETROIT, MIClHIGAIN'.

MTHOD 0F FOBMING REENFOBCED CONCRETE STRUG "l 'Il C:

Application led April 2,

To all 'whom tm/ay come/rn.'

Be it known that I, WILLIAM MITCHELL, a citizen of the United States of America,l residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Methods of Forming Reenforced Concrete Structural Members, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to reenforced concrete structural members and the method of forming the same. One object of the invention is to provide a construction which can be. readily and. cheaply manufactured and can take the place of reenforced concrete constructions, in which it is necessary to erect false-work for holding the cement while in plastic condition. Another object is the provision of a construction in which the sides of the metallic reinforcin member are coated with cement to comp etely encase the reinforcing member; and further, to shape to a container or hollow form the metallic reinforcin member and coat the inside and outside o the sam'e with cement so as to form a container in which plastic concrete may be poured and by which it will be retained until hardened. A further object is to provide hollow constructions which can be assembled in relation to each other and then filled with lastic concrete. Other features of the invention reside in the method of forming the reinforcing concrete structural members, in their assembly and filling, and in further advantages as more fully hereinafter set forth.

In the drawings:

Figure 1 is a perspective view-of a reenforced concrete`structural member embodyingrmy invention;

' igure 2 is a similar view of a modified construction Figures 3, 4 and 5 are cross-sections of other modified constructions;

Figure 6 is a cross-section on the line 6-6 of Figure 4;

Figure 7 is a perspective view, with parts broken away, showing an assembly of some of the reenforced structural members;

Figure 8 is a cross-section through a portion of modified construction.

As shown in Figure 1, 1 is a metallic reinforcing member having a series of apertures or' meshes therein, such asl metal lath, which is coated with cement by drawing the` 1919. Serial No. 288,988.

` same through a bath of plastic cement.

This plastic cement extends through and closes the apertures or spaces in the reinforcing member and forms coatings or layers 2 on itssides .to completely encase the same. Before hardening of the coatings the surfaces of either one or both are suitably nished so that the structure is finished and ready to be used after vthe cement has sufficiently hardened. This construction is adapted for use particularly as siding `upon a building. Another method of coating the reinforcing member is to place the same into a mold and pour the plastic cement into the mold to coat both sides and pass through the apertures therein.

Figure 2 shows an apertured reinforcing member 3 bent into a channel shape and then coated outside and inside with cement by drawing the same through a bath of plastic cement', which cement extends through the frame lor reinforcing member and formscoatings or layers4 to completely encase the reinforcing member. This cement, when hardened, forms an impervious construction which may be used in various ways, such as beams, etc. If desired, these Figure 3 discloses another modified con-v struction in vwhich the reinforcing member 5 is so formed that its sides encloses a rectangular space. This reinforcing member is encased by integral coatings of cement 6 by the same method as above described. This construction may be used as a wall section and can be strengthened by connecting the ends of the reinforcing member 5 intermediate the sides before the same are coated by means of a suitable reinforcing strip 7 and then coating all the sides by the above method. To make the construction still stronger, plastic concrete 8 may be poured into one of the spaces betweenthe intermediate partition and'one of the sides, where it will be contained until hardened, the other space remaining empty so that an air spac will be formed in the sectlon.

As shown in Figure 4, 10 is a column having the basel 11, central portion 12 and top 13. The base 11 has the apertured reinforcing member 14 which is of substantially the same contour as the outer surface of the cement coated thereon by the above method. This base is filled with concrete, thereby making a solid construction. The central portion 12 has the apertured metallic reinforcing member 15, which has the coats 16 upon its inside and outside which are formed as above described. The top 13 has the metallic reinforcing 17 which, when the top is placed upon the central portion 12, is in substantial alignment with the reinforcing 15 of the central portion. 18 is a metallic reinforcing member extending outwardly and upwardly away from the lower edge of the reinforcing 17. This reinforcing 18 has substantially the same form as the outer contour of the coating of cement 19 encasing the reinforcing members.

ln erecting the column the base 11 is set up and the central portion 12 placed upon the base and then the top portion 13 placed upon the central portion. lf it is desired to strengthen the column, plastic concrete is poured through the aperture in the top portion to lill the space withing the central portion 12, as well as the central portion within the top, wall ties 20 being provided for more securely tying the concrete to the shell formed by the reinforcing with its coatings of cement. This concrete does not enter the space between the upright and outwardly and upwardly flaring walls of the to v lin order to produce the desired contour of the base 11 and top 13, the outer coatings of cement are suitably formed before the cement has hardened, preferably by scraping od' part of the outer coating before hardening thereof to produce the desired curves. f

As shown in Figure 6, the reinforcing used may be provided with projections 21, which are not apertured, thereby strengthenin the construction.

lf it is desired to produce econstructions having recesses therein of greater depth than would be permitted by one coating of cement upon the reinforcing, the construction may be given a desired number of coatings by passing the same through a number of baths after permitting the preceding coating to slightly harden. This is shown in Figure 5 where 22 is the reinforcing, 23 are the first coatings upon .the inside and outside of the reinforcing and 24 are the second coatings upon the inside and outside of the previous coatings 23, which coatings are formed by the above method. formed outside the reinforcing 22, these recesses being inthe present instances Hut-- ings in a column. ln order to produce an external finished construction, the surfaces of the outer coatings are shaped and inished 25 are recesses neeaeie before hardening, so that it is not necessary to finish the same after erection.

. From the above, as thus far described, it will be readily seen that T have provided a simple method of forming reenforced concrete structural members in which the reinforcing is coated on its sides, as by passing the reinforcing through a bath of plastic cement, or by casting the cement around the reinforcing. Furthermore, these coatings of cement close the apertures in the reinforcing and form an impervious construction which is adapted to retain plastic concrete without permitting the escape of the cementitious liquid in this concrete. Due to this construction, it is not necessary to erect false-work to retain the plastic concrete. Furthermore, the structure formed has material advantages over constructions formed by the previous methods. Due to the cement and metallic reinforcing being closely bonded the construction is Very strong so that the quantity of reinforcing and concrete is considerably decreased. Furthermore, the surface of the outer coating being finished durinof the manufacture, it is not necessary to plaster or otherwise nish the same after erection of the structure.

A very important feature of the invention resides in the structure shown in Figure 7, wherein 26 is a hollow reenforced cement column. 27 are hollow reenforced cement beams of channel shape extending between and resting u on the upperends of the columns 26. 28 are liollow reenforced cement Hoor sections of channel or lll-shape which extend between parallel-extending beams 27 and are mounted thereon. Specifically, these floor sections have the upwardly-extending anges 29 at their ends which terminate in laterall extending flanges 30 which rest upon t e upper edges of the beams 27. These columns, beams and floor sections are formed by the above method and, when assembled, form series of impervious shells9 which are adapted to contain plastic concrete poured thereinto without the necessity of usin false-work. This plastic concrete is eontlnuous so that in leffect a monolithic uilding construction is secured for each oor.

As shown in the modified construction in Figure 8, the beam 31 is of more rounding shape and the flanges 32 at the ends of the door sections 33 extendupwardly and outwardly and conform to the outer curvature of the upper portion of the beams.

Tt will readily be seen from the above descriptions that T have provided hollow reenforced vstructural forms which may be readily :assembled in relation to each other vand which, when assembled, are adapted to contain plastic concrete `which will continuously form the floor sections and beams and lll@ extend through the column.: This construc- 13o tion and the method of building is highly advantageous inasmuch as the building may be more readily and cheaply manufactured and, furthermore, consume less time, since the columns, beams, floor sections and any other 4necessary sections may be brought to the place of assembly and assembled immediately. The outer surfaces of these sections 'are finished before assembly, which also facilitates the construction of the building. lVhat I claim as my invention is: 1. The method. of forming a reenforced vstructural member which consists in first shaping the member and subsequently passing said member through a bath of plastic cement to completely encase said member.

2. The method of forming a reenforced structural member, comprising the bending- 3. The method of forming a reenforced concrete structural member, comprising the bending of 'an apertured reinforcing member to hollow shape, the passing of the member through lastic cement to fill the apertures of andp coat the inside and outside thereof, the allowing of the hardening of the cement to form an impervious hollow unit construction, and the filling of the hollow member with plastic concrete. l

4. The method of forming a reenforced concrete structural member, comprising the forming of an apertured reinforcing member to enclose a s ace, the passing of the member through p astic cement to coat the inside andl outside thereof, the allowing of the hardening of the cement upon the member to form an impervious reenforced shell, and the filling of the space in the shell with plastic concrete.

In testimony whereof I aiiix my signature.

, WILLIAM MITCHELL.

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