Abstract: A suspended membrane structure, comprising:a plurality of suspending members arranged substantially parallel or substantially radial fashion;a membrane downward hung by a plurality of wire members (or hanging members) from a plurality of points on each suspending member; anda plurality of bracing cables each provided on the membrane in the same direction with that of said suspending member at each middle position between said suspending members, and capable of imparting a tensile force to said membrane.

Abstract: An earth anchor device in which a plurality of flanged load-resistant plate couplers are removably screwed at predetermined intervals on a prestressing tendon (which usually may be cold drawn steel wire, or alloy steel wire or bar having high tensile strength, hereinafter referred to as "Tendon") forming the core portion of an earth anchor, a spring mechanism is closely annexed to the load-resistant surface of each of the flanged load-resistant plate couplers, and protective synthetic resin tubes each having an inner diameter slightly larger than the diameter of the Tendon are mounted over the peripheral portions of the Tendon which are exposed; and an earth anchor work method using such an anchor device. The anchor device is inserted into a bore drilled in the earth and embedded integrally with a charge of mortar forced into the bore, and after used, the Tendon of the anchor device is removable from the earth anchor device by being rotated about the axis thereof.BACKGROUND OF THE INVENTION1.