Hydraulic and earth engineering – Fluid control – treatment – or containment – Fluid storage in earthen cavity
Patent
1986-04-29
1988-01-05
Raduazo, Henry E.
Hydraulic and earth engineering
Fluid control, treatment, or containment
Fluid storage in earthen cavity
405133, 521696, E02D 2700
Patent
active
047172851
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns a cistern structure intended to be used as a subterranean cistern and of which the shell has been formed of a material impermeable to the material to be stored therein.
Steel-lined subterranean oil cisterns have heretofore been built in the manner that the space between the sheet steel shell of the cistern and the rock has been completely filled with concrete by pouring. The thickness of the concrete layer has then varied in the range from 0.1 to 2 meters, depending on the accuracy with which the rock blasting has been done. The drawback encumbering such cisterns is, above all, that in the construction job immense quantities of concrete are required, with the result that the constructing of the cistern is extremely costly. From the detrimental heat generation of the concrete arises the drawback that the steel wall tends to become wavy, for which reason one is generally compelled to use a relatively thick steel wall and bolting with very close spacing. The massive concrete envelope precludes the use of the cistern as storage for cold liquids because the steel shell tends to become detached from the concrete shell. In high cisterns, the ground water pressure causes detrimental stresses acting on the structure, in spite of the draining that is applied. This mode of construction of prior art is also time-consuming, with the result that the total cost of the cistern will be high. The use of poured concrete is advocated by the fact that the corrosion phenomenon occuring in a thick steel shell can be managed by the aid of concrete pouring.
SUMMARY OF THE INVENTION
The object of the invention is to achieve an improvement of cistern structures known in the art. The more detailed object of the invention is to provide a subterranean cistern in which a substantially thinner steel shell can be used. It is a further object of the invention to provide a subterranean cistern in the constructing of which considerably less concrete is needed. One object of the invention is to provide a subterranean cistern in which cold liquids may also be stored with ease. It is also an object of the invention to provide a subterranean cistern which is free of problems caused by water. One further object of the invention is to provide a subterranean cistern which is fast as to its mode of erection and considerably less expensive of its construction costs.
The aims of the invention are achieved by means of a subterranean cistern structure which is mainly characterized in that the shell of the cistern is encircled by annular juncture elements spaced with reference to each other and which are provided with anchoring elements by the aid of which the cistern is anchored in the rock or in the soil.
The rest of the characteristic features of the cistern structure of the invention will be apparent below.
By the cistern structure according to the invention, numerous significant advantages are gained. The steel shell of the subterranean cistern structure can be made considerably less in thickness. Moreover, far less concrete is needed than in any equivalent structures of prior art. In a cistern meant for storing cold liquids, the concrete ring serving as juncture element may be thermally lagged against the rock at the points between the anchoring points which are indispensable for support. In the subterranean cistern structure of the invention, the ground water problem can also be solved in a reliable way. The invention furthermore enables an extraordinarily inexpensive and fast mode of construction, as a result of which the shell structure of the subterranean cistern of the invention will be considerably less expensive than the structure of prior art concreted on site.
Furthermore, the comparatively light and ductile structure of the invention has a better tolerance of earthquakes; it is easy to modify the strength of the structure to be consistent with the load; and the accuracy with which the wall of the excavation is made has no decisive influence on the building costs.
BRIEF DESCR
REFERENCES:
patent: 3151416 (1964-10-01), Eakin
patent: 3984956 (1976-10-01), Oger
patent: 4241762 (1980-12-01), Link
patent: 4425743 (1984-01-01), Bartur
Neste Oy
Raduazo Henry E.
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