US2666974A - Method of producing upright hollow walls of reinforced concrete - Google Patents

Description

Jan. 26, 1954 L. G. LEANSE 2,666,974

THE METHOD OF PRODUCING u GHT HOLLOW WALLS OF REINFORCED CRETE Filed June 11, 1951 2 Sheets-Sheet 1 Jan. 26, 1954 Filed June 1.1, 1951 fgj L. G. LEANSE THE METHOD OF PRODUCING UPRIGHT HOLLOW WALLS OF REINFORCED CONCRETE 2 Sheets-Sheet 2 Patented Jan. 26, 1S54 UNETED OFFICE METHOD 0F PRODUCIN G UPRIGHT HOLLQW WALLS 0F REINFQRCED CONCRETE Claims priority, application Great Britain June 26, 1950 1 Claim.

mattress is filled with concrete, whereupon the inflation of the mattress is continued and the concrete is pro-stressed, with the said reinforcements incorporated therein the mattress being then deflated and removed.

ihe mattress is provided on either side with vertical ribs which are brought into engagement with clips welded or otherwise suitably secured to the wire mesh reinforcements and after the mattress has been deflated and removed, tie bars are inserted between the clips lying in depressions left in the concrete by the ribs on the mattress.

One mode of carrying the invention into efiect is illustrated, by way of example and diagram matically, in the accompanying drawings in connection with the production of a vertical wall.

Figure 1 is a plan view showing the general arrangement for carrying out the method by which a wall of reinforced concrete is produced. :2,

Figure 2 is a plan view of the wall of reinforced concrete as finally produced.

Figure 3 is an elevation of the inflatable mattress, and

Figure 4 is an elevation of a lead lining, which may be used for the purpose hereinafter explained.

Ref rring to the drawings, A are the shutterings, B wire mesh reinforcements, and C an inflatable mattress of rubber or other suitable material capable of withstanding the required stresses and pressures of compressed air, steam or other gases, or of hydraulic or other pressure means. Its opposite sides are connected together reinforcing bars G of the same material as the mattress.

C are vertically extending ribs, preferably of wedge or dovetail cross-section, provided on either side of the mattress, and brought into engagement with clips H of corresponding shape secured to the wire mesh reinforcements B, pref-- erably through th interposition of distance rods I welded to the said wire mesh reinforcements and to the clips.

The vertical ribs C taper in the downward direction, as shown in Figure 3, and the width of the clips H secured to the Wire mesh reinforcemerits B varies accordingly, so that the preliminarily inflated mattress can be easily dropped into and kept in position by wedge action in and between the wire mesh reinforcements. The ribs C may be made of other cross-section than shown, e. g. of circular, oval or rectangular crosssection, and they are solid or hollow.

After the mattress has been set up in the position shown in Figure 1, the concrete is poured in, either in the usual manner or by pumping it in by a high pressure hose, whereupon the preliminarily inflated mattress is inflated to the re quisite pressure and the concrete is pre-stressed. When the concrete has set the mattress is deflated and is easily removed from the concrete.

As shown in Figure 2, the concrete is now formed as a hollow Wall J having wedge-shaped tapering channels J opposite each other running from top to bottom and reinforced by the w re mesh B to which the clips H are attached.

The two wall faces J are tied together by steel tie members E and F dovetailed at each end a l of varying tapered width, inserted into the channels J in engagement with the clips H at heights corresponding to their tapered width, the broader tapered ends of ties E holding at the higher levels, and the narrower ones of the ties F at the lower levels.

The structure obtained by the present invention lends itself to the insertion into the cavity of the wall, of lead faced panels D (see Figure 2) part of one of which is shown in elevation in Figure 4, thereby providing a complete lead 1ining as a protection against radiation from atomic explosions, the lead thickness varying according to need. The lead panels are suspended on and held in place, as shown in Figure 4, by the steel ties E and F, which may also be lead coated. The panels overlap at the joints as shown in ure 2.

The structure obtained according to the pres ent invention has the following advantages:

The pressures created by inflating the mattress which can be applied to the concrete surfaces are such as will give added strength, smooth outer surfaces after removing the special smooth faced shuttering, thus obviating the need for subse quent plastering on finish surfaces, and be more economical in the quantity of concrete needed to give the required strength than by other means. Moreover, by the application of specific predetermined pressures the concrete is stressed to an extent that has not hitherto been possible, thui ensuring (a) minimum wall thicknesses to serve the particular need and effecting considerable savings in the amount of concrete to be used, (b) that the reinforcement is completely immersed in the concrete without the hazards of air spaces on or around the reinforcement which with moisture would cause oxidation of the steel, and consequent deterioration of the reinforcement, and (c) the alignment of the reinforcement throughout the length of the structure.

Further, the method of holding the reinforcing steel mesh in position by afiixing it with clips or the like to the inflatable mattress ensures absolute precision in the positioning of the reinforcement more accurately and by cheaper means than by any other method.

The advantage of the tapering channels in the cavity between the two sides of the walls is that they ensure great rigidity by the insertion of the ties at any point required to provide adequate bonding of the wall either side of the cavity.

The use of lead panels according to the invention also provides excellent thermal insulation and affords protection against radiation following atomic explosion.

By using resistance wire suitably affixed to the reinforcing mesh the wall surface may be heated in cases where internal and/or external heating is required.

The invention is applicable amongst others to the building of houses, public buildings, factories, offices, docks, harbours, marine installations of all kinds, boats, pilings, piers, bridges, and other structures, and it may be used either for a single wall or multiple walls as required.

The design of the inflatable mattress may be varied to provide different sections, and channels or profiles of any kind and any dimension may be placed between or on the outside surfaces of the concrete or both. The mattress itself may be made of rubber, plastic, expending metal, canvas, nylon, any textile, plastic, composition material or any animal, mineral or vegetable matter.

The panel for protection against radiation may be placed within or outside the cavity and instead of lead use may be made of any other material fulfilling the same purpose.

The steel ties may be round, square, rectangular or of any other cross-section, and may vary in depth and width to any required extent.

The details for carrying the invention into efifect may be modified without departing from its scope.

I claim:

A method of producing upright hollow walls of reinforced concrete comprising the steps: erecting shutterings between which the hollow wall of reinforced concrete is to be produced; placing wire mesh reinforcements between and near the said shutterings but not in contact therewith; preliminarily inflating an inflatable mattress provided with means for forming vertical downwardly tapered recesses on the inner surfaces of the two parts of the wall of reinforced concrete and mounting the same between the said wire mesh reinforcements leaving free spaces between the latter and the mattress; pouring concrete into the spaces between the mattress and the shutterings, thereby incorporating the wire mesh reinforcements in the concrete; inflating to the required pressure the preliminarily inflated mattress, whereby the concrete is prestressed; deflating and removing the mattress after the concrete has set, and inserting tie members between the said two inner surfaces after the removal of the deflated mattress.

LEON GERALD LEANSE.

References Cit-ed in the file of this patent UNITED STATES PATENTS Number Name Date 1,329,095 Richardson Jan. 27, 1920 1,398,209 Van Bavegem Nov. 22, 1921 1,413,404 Hewett Apr. 18, 1922 1,539,550 Emery May 26, 1925 1,964,386 Nose June 26, 1934 2,048,253 Freyssinet July 21, 1936 2,129,769 Jennings Sept. 13, 1938 2,270,229 Neif Jan. 20, 1942 2,542,874 Locatelli Feb. 20, 1951

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