Static structures (e.g. – buildings) – Specified terranean relationship – Open top – embedded container – tank – or reservoir
Patent
1977-05-31
1979-03-06
Ridgill, Jr., James L.
Static structures (e.g., buildings)
Specified terranean relationship
Open top, embedded container, tank, or reservoir
52742, 264 35, 417221, E04H 318
Patent
active
041423372
ABSTRACT:
Resin is sprayed onto the inside of a mold. Fiberglass is then applied to the resin to form a shell having a bottom, side walls and an upper, outwardly turned lip. The fiberglass forms a somewhat roughened surface on the inner side of the completed shell, thereby eliminating the cracking and chipping of the inner surface which has heretofore occured when the fiberglass was on the outer side of the shell and the inner surface of the shell was smooth resin.
After the required plumbing is mounted on the shell, the shell can be installed at the desired location, usually in the ground and frequently near a swimming pool.
A hole is formed in the ground somewhat larger than the shell and at least three stakes of appropriate length are driven into the bottom of the hole, adjacent the periphery thereof, to a depth such that the upper ends of the stakes coincide with the desired height of the lip of the shell. The shell is then lowered into the hole so that the lip rests on the stakes for support of the shell. At this juncture the hole around the shell is filled with concrete grout which ultimately hardens in order rigidly to set the resulting spa into the ground but which initially is in a semi-liquid state. During the time the grout is semi-liquid it exerts an upward buoyant force on the bottom of the shell, thereby urging the shell upwardly. Pursuant to the method of the present invention the shell is filled with water as the grout is added at a rate such that the weight of the water slightly exceeds the upward force of the grout, thereby maintaining the shell in supporting engagement with the stakes and thus establishing accurate grade and avoiding tilt. Anchors may also be provided on the bottom of the shell, in which case a hardening accelerator, such as calcium chloride, is added to the initial charges of grout until the level of the grout is above the anchors. The accelerator causes the grout to harden and grip the anchors, thus securing the shell in place quickly.
REFERENCES:
patent: 2757385 (1956-08-01), Whittick
patent: 2887759 (1959-05-01), Brownell
patent: 3015191 (1962-01-01), Lucchesi
patent: 3397494 (1968-08-01), Waring
patent: 3572225 (1971-03-01), Burton
patent: 4060946 (1977-12-01), Lang et al.
Adelbert P. Mills, Harrison W. Hayward, Lloyd F. Rader, Materials of Construction, John Wiley and Sons, New York, 1955, Sixth Ed., pp. 419 and 420.
Modern Plastics, Jan., 1952, pp. 96 & 97.
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