A modular system for on-site assembly of a double-square pyramid shelter and attachment of said double-square pyramid shelter to a ground surface, comprising:
- three or more equilateral triangular side panels, each equilateral triangular side panel being of equal size and including
- a triangular, panel frame, said triangular, panel frame comprising
- a rigid first side beam, a second side beam, and a base beam, the first and second side beams having upper ends joined at an apex of said triangular, panel frame and the base beam extending between, and joined to, opposite, lower end portions of the first and second side beams;
- coupling means attached to the first and second side beams for attaching in parallel, side by side alignment a first side beam of said triangular, panel frame to a second side beam of a triangular, panel frame of any other triangular side panel of said modular system;
- covering means partially or fully covering at least one side of said triangular, panel frame;
- anchor means reversibly attachable to a lower end portion of each equilateral triangular side panel for securing a triangular, side panel to the ground at a location selected for on-site assembly of said double-square pyramid shelter, said anchor means including
- a corner anchor assembly for each corner of said double-square pyramid shelter, said corner anchor assembly including
- a lower anchor plate;
- a split, upper anchor plate comprising a first and second upper plate in side by side, coplanar relation;
- wherein the lower anchor plate and the first upper plate and the second upper plate each have a plurality of rebar apertures disposed and dimensioned for insertion of rebar therethrough;
- fastener means for reversibly attaching the first and second upper plates to the lower anchor plate;
- and
- telescopically adjustable means attached to, and extending upward and away from, the first upper plate and/or the second upper plate for reversibly attaching either one or both of the first upper plate and/or the second upper plate to a lower end of a first or second side beam of a side panel;
- wherein each of the first and second side beams has a hollow, lower end portion and each of the first and second upper plates includes an upstanding anchor rod, said upstanding anchor rods having lower ends attached to said first and second upper plates at 60 degree angles with respect to said first and second upper plates and opposite, upper ends, said opposite, upper ends being dimensioned for insertion into the hollow, lower end portion of a first or second side beam, and means for reversibly locking the upstanding anchor rods within said lower end portions;
- wherein said double-square pyramid shelter comprises
- a first incomplete square pyramid shelter formed by joinder to one another of a first, second and third equilateral, triangular side panels, the base beam of each equilateral triangular side panel being aligned along a different one of the edges of a first square base of said first incomplete square pyramid shelter, leaving uncovered one open side of said first, incomplete square pyramid shelter;
- a second incomplete square pyramid shelter formed by joinder to one another of fifth, sixth and seventh equilateral, triangular side panels, the base beams of each of said fifth, sixth and seventh equilateral, triangular side panels being aligned along a different one of the edges of a second square base of said second incomplete square pyramid shelter, thereby leaving uncovered one open side of said second incomplete square pyramid shelter opposite to, and facing, the open side of the first, incomplete, square pyramid shelter;
- wherein said first and second, incomplete square pyramids are joinable together along a common joinder line between said first and second square bases with said uncovered one open side of said first, incomplete square pyramid shelter and said uncovered one open side of said second, incomplete square pyramid shelter symmetrically disposed on opposite sides of the common joinder line, thereby defining a pair of equilateral triangular gaps between the first and second, incomplete square pyramids, which gaps are disposed symmetrically opposite each other on the common joinder line;
- and
- further including fourth and eighth equilateral, triangular side panels, which, when inverted, are insertable into congruent, covering relation with said equilateral triangular gaps such that the base beams of the seventh and eighth triangular side panels are aligned parallel and adjacent to each other and, in combination, define a roof ridge of the double-square pyramid shelter, and the apexes of the seventh and eighth triangular side panels lie on the common joinder line;
- and
- wherein, once said modular system has been assembled at said location to form a double-square pyramid shelter and has been attached to said ground surface by rebar driven into the ground through said rebar apertures of each corner anchor assembly, and the first and second upper plates of each corner anchor assembly overlie, rest upon, and are attached by said fastener means to the lower anchor plate of each corner anchor assembly and are attached by the telescopically adjustable means to a lower end of a first or second side beam, either of the first or second upper plates of each corner anchor assembly can be detached from the lower anchor plate thereof to facilitate removal of triangular side panels from said double-square pyramid shelter and attachment of additional triangular side panels to said double-square pyramid shelter and thereby enlarge said double-square pyramid shelter.