A portable building comprising:
- a support frame, further comprising:
- a minimum of eight ground stakes driven vertically into the ground and equally spaced in a circular pattern of the overall circumference of said building, whereby said stakes further comprise an upper end and a lower end, whereby the lower end of each ground stake is driven at right angles into the ground, and whereby the upper end of each said ground stake protrudes vertically upward from the ground;
- a central top weight-bearing hub comprising a minimum of eight receptacles, their number being equal to the number of said ground stakes, equally spaced around the circumference of said hub such that said receptacles point radially outward from the center of said hub and align in the same direction as each said ground stake;
- and
- a minimum of eight flexible poles, their number being equal to the number of said ground stakes, each pole further comprising an upper end, a lower end and a middle support section, each pole's upper end inserting into its corresponding receptacle of said central top hub, and each pole's lower end inserting over or into said ground stakes, wherein each pole's lower end is perpendicular to the ground, resulting in a hemispherical shape of the support frame;
- an inner fabric layer, further comprising:
- a minimum of eight petal-shaped fabric panels, their number being equal to the number of said ground stakes, each petal-shaped fabric panel further comprising an upper side, a lower side and two concave-curved vertical sides, each petal-shaped fabric panel sewn together adjacently along their concavely curved vertical sides to form a substantially hemispherical shape thus providing an inside surface and an outside surface of said inner fabric layer;
- a circular-shaped fabric panel sewn along its entire circumference to the upper sides of each said petal-shaped fabric panel;
- a circular-shaped waterproof fabric panel sewn along its entire circumference to the lower sides of each said petal-shaped fabric panel creating a floor for the inner fabric layer;
- and
- a minimum of eight cylindrical fabric sleeves, their number being equal to the number of said ground stakes, wherein each said sleeve comprises a lengthwise dimension substantially equal to the vertical side length of said petal-shaped panels, and each said sleeve sewn lengthwise to the outside of said inner fabric layer along their curved vertical side;
- an outer fabric layer, further comprising:
- a minimum of eight petal-shaped fabric panels, their number being equal to the number of said ground stakes, each petal-shaped fabric panel further comprising an upper side, a lower side and two vertical sides, each petal-shaped fabric panel sewn together adjacently along their vertical sides to form a substantially hemispherical shape thus providing an inside surface and an outside surface of said outer fabric layer;
- a circular-shaped fabric panel sewn along its entire circumference to the upper sides of each said petal-shaped fabric panel, and placed over the inner fabric layer and the support frame;
- wherein the bottom rim possesses a minimum of eight reinforced fabric loops, said loops to hold said outer fabric layer in place with tent pegs anchored to the ground;
- and
- a waterproof fabric compartment sewn along its entire lower circumference containing within it tubular sacks filled with gravel, rock, metal or sand.
- wherein the overall size of said outer fabric layer is constructed to fit and conform over the support frame;
- wherein the air space formed between said inner and outer fabric layers provides a layer of insulation against the ambient temperature;
- wherein said ground stake's vertical protrusion above the ground is a structural component of said support frame that stabilizes said flexible poles lower ends in a rigid vertical alignment;
- and
- wherein the hemispherical shape of said flexible poles is maintained under pressure by the combined action of said vertically protruding rigid ground stakes holding said flexible poles lower ends curved in the direction of the center of said building, and the weight of said central top hub exerting downward pressure against said flexible poles upper ends.