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A storage vessel system for subterranean installation and a method for constructing such a system. The system includes a storage vessel and a support structure for supporting the storage vessel so that the weight of the storage vessel and any upward buoyancy force applied to the storage vessel are b

A storage vessel system for subterranean installation and a method for constructing such a system. The system includes a storage vessel and a support structure for supporting the storage vessel so that the weight of the storage vessel and any upward buoyancy force applied to the storage vessel are both transferred to the support structure. More particularly, the support structure defines a vessel housing and the storage vessel is contained within the vessel housing. The support structure includes a bearing surface adapted for contacting the ground so that the system is supported on the ground, a vessel anchor for anchoring the storage vessel so that the upward buoyancy force applied to the storage vessel is transferred to the support structure, an exterior shell which permits an infiltrating fluid to infiltrate the vessel housing, and a packing material contained within the vessel housing by the exterior shell and substantially surrounding the storage vessel in order to protect and support the storage vessel.

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A storage vessel system for subterranean installation and a method for constructing such a system. The system includes a storage vessel and a support structure for supporting the storage vessel so that the weight of the storage vessel and any upward buoyancy force applied to the storage vessel are b

A storage vessel system for subterranean installation and a method for constructing such a system. The system includes a storage vessel and a support structure for supporting the storage vessel so that the weight of the storage vessel and any upward buoyancy force applied to the storage vessel are both transferred to the support structure. More particularly, the support structure defines a vessel housing and the storage vessel is contained within the vessel housing. The support structure includes a bearing surface adapted for contacting the ground so that the system is supported on the ground, a vessel anchor for anchoring the storage vessel so that the upward buoyancy force applied to the storage vessel is transferred to the support structure, an exterior shell which permits an infiltrating fluid to infiltrate the vessel housing, and a packing material contained within the vessel housing by the exterior shell and substantially surrounding the storage vessel in order to protect and support the storage vessel. ly polarized light, and a polarization conversion device that converts a polarization direction of a first type of linearly polarized light of the two types of linearly polarized light to a same polarization direction as a second type of linearly polarized light, wherein a light beam entering the polarization conversion device is split by the power variation optical relay system into a plurality of partial light beams, and the size of each of the plurality of partial light beams in the prescribed direction is reduced by the power variation optical relay system. 3. The illumination system according to claim 2, wherein the superposition optical system includes: a third lens array having a plurality of third small lenses on which the plurality of partial light beams entering the superposition optical system impinge, a fourth lens array having a plurality of fourth small lenses corresponding to the plurality of third small lenses, and a superposition lens that superposes onto the illumination region a plurality of partial light beams passing through the third lens array and the fourth lens array. 4. The illumination system according to claim 3, wherein the polarization conversion system is disposed between the third lens array and the fourth lens array. 5. The illumination system according to claim 4, wherein the second lens array and the third lens array are optically integrated. 6. The illumination system according to claim 2, wherein the superposition optical system includes: a third lens array having a plurality of small lenses that superposes the plurality of partial light beams substantially on the illumination region, and a fourth lens array having a plurality of fourth small lenses corresponding to the plurality of third small lenses. 7. The illumination system according to claim 6, wherein the polarization conversion system is disposed between the third lens array and the fourth lens array. 8. The illumination system according to claim 7, wherein the second lens array and the third lens array are optically integrated. 9. The illumination system according to claim 2, wherein the polarization conversion system is disposed between the power variation optical relay system and the superposition optical system. 10. The illumination system according to claim 2, wherein the polarization conversion system is disposed between the relay lens array and the second lens array of the power variation optical relay system. 11. The illumination system according to claim 2, wherein the plurality of first small lenses of the first lens array each has a different optical axis position in a direction perpendicular to the prescribed direction so that a plurality of partial light beams entering the polarization conversion system are mutually adjacent in at least the direction perpendicular to the prescribed direction. 12. The illumination system according to claim 11, wherein a plurality of partial light beams arrayed in the prescribed direction are each reduced in the power variation optical relay system by a reduction ratio that differs according to an array position of each partial light beam. 13. The illumination system according to claim 2, wherein the relay lenses are constituted by a composite lens comprising at least two lenses. 14. A projector for displaying projected images, comprising: an illumination system according to any one of claims 1 to 13, an electro-optical device that converts light received from the illumination system to light for forming images responsive to image signals and emits the light thus converted, and a projection optical system that projects light emitted from the electro-optical device. 15. The projector according to claim 14, further comprising: a color separator that separates light emitted from the illumination system into a plurality of color components, a plurality of the electro-optical devices for separately receiving each of the color components separated by the color separ ator, and a color combiner for combining light of each color component emitted by the plurality of electro-optical devices, wherein the projection optical system projects the combined light emerging from the color combiner. 16. The projector according to claim 15, wherein, assuming x, y, z as three mutually orthogonal directional axes where z is a direction parallel to an optical axis of light emerging from the illumination system, the color separator has a color separation surface plane that is substantially perpendicular to plane xz and is inclined by a prescribed angle with respect to plane yz, and the illumination system is positioned so that the prescribed direction in which a plurality of pairs of polarization splitting film and reflecting film included in the polarization conversion system are arrayed is substantially identical to the y direction. 17. The projector according to claim 15, wherein, assuming x, y, z as three mutually orthogonal directional axes where z is a direction parallel to an optical axis of light emerging from the illumination system, the color combiner has a color combining surface plane that is substantially perpendicular to plane xz and is inclined by a prescribed angle with respect to plane yz, and the illumination system is positioned so that the prescribed direction in which the plurality of pairs of polarization splitting film and reflecting film are arrayed is substantially identical to direction y. 18. A projector for displaying projected images, comprising: an illumination system according to any one of claims 1 to 13, a reflecting type electro-optical device that converts incident light to light for forming images responsive to received image signals while reflecting the light, a projection optical system that projects light emitted from the reflecting type electro-optical device, and a polarization splitting device that directs first linearly polarized light received from the illumination system toward the reflecting type electro-optical device and also directs toward the projection optical system second linearly polarized light that is received from the reflecting type electro-optical device and that is polarized in a direction perpendicular to the first linearly polarized light. 19. The projector according to claim 18, wherein, assuming x, y, z as three mutually orthogonal directional axes where z is a direction parallel to an optical axis of light emerging from the illumination system, the polarization beam splitter element has a polarized light separation surface plane that is substantially perpendicular to plane xz and is inclined by a prescribed angle with respect to plane yz, and the illumination system is positioned so that the prescribed direction in which a plurality of sets of polarization splitting film and reflecting film included in the polarization conversion system are arrayed is substantially identical to the x direction. 20. A projector for displaying projected images, comprising: an illumination system according to any one of claims 1 to 13, an electro-optical device that includes a plurality of pixels each including a plurality of sub-pixels corresponding to light of each of a plurality of colors and a condenser optical system comprising a plurality of small condenser lenses corresponding to each pixel, the electro-optical device converting light transmitted by each pixel to light for forming image of each pixel responsive to given image information, a color separator that separates light emerging from the illumination system into a plurality of color components and also directs light of each of the plurality of color components in a mutually different direction to impinge on the sub-pixels corresponding to the respective color components, and a projection optical system for projecting light emitted from the electro-optical device. 21. The projector according to claim 20, wherein, assuming x, y, z as three mutually orthogonal d