Structural building panel and panel system

A system for casting concrete for forming subterranean walls in connection with a dwelling or other building structure, comprising,

• a first sandwich building panel, said panel including a pair of spaced first and second panel members and an inner core, said inner core being formed of an elongated third panel member situated in spaced parallel relation between said first and second panel members and a plurality of fourth panel members arranged in spaced side-by-side fashion transversely on either side of said third panel member in contact relation with said first and second panel members,
• a second sandwich building panel, said panel including a pair of spaced first and second panel members and an inner core, said inner core being formed of an elongated third panel member situated in spaced parallel relation between said first and second panel members and a plurality of fourth panel members arranged in spaced side-by-side fashion transversely on either side of said third panel member in contact relation with said first and second panel members,
• a tongue-like projection co-extensive with one side edge of said third panel member to define a male end and a grooved section co-extensive with the opposite side edge of said third member to define a female end,
• said first and second sandwich panel members being arranged in spaced apart opposing relation to define a space therebetween and adapted to receive a cement slurry wherein said cement can harden to form a subterranean wall structure in combination with said first and second sandwich panel members.

A system for casting concrete for forming subterranean walls in connection with a dwelling or other building structure, comprising,

• a first sandwich building panel, said panel including a pair of spaced first and second panel members and an inner core, said core being formed of an elongated third panel member situated in spaced parallel relation between said first and second panel members and a plurality of fourth panel members arranged in spaced side-by-side fashion transversely on either side of said third panel member in contact relation with said first and second panel members,
• a second sandwich building panel, said panel including a pair of spaced first and second panel members and an inner core, said core being formed of an elongated third panel member situated in spaced parallel relation between said first and second panel members and a plurality of fourth panel members arranged in spaced side-by-side fashion transversely on either side of said third panel member in contact relation with said first and second panel members,
• a tongue-like projection co-extensive with one side edge of said third panel member to define a male end and a grooved section co-extensive with the opposite side edge of said third member to define a female end,
• said first sandwich panel member being joined in a series with a plurality of adjacent like panel members and said second sandwich panel member being joined in a series with a plurality of adjacent like panel members, said series of first and second sandwich panel members being arranged in spaced apart opposing relation to define a space therebetween and adapted to receive a cement slurry wherein said cement can harden to form a subterranean wall structure in combination with said first and second sandwich panel members.