# US 4,420,915 A · Large-panel concrete wall bearing components > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,420,915 A - Document ID: US4420915A - Status: Granted - Kind: A - Application number: 06/140,370 - Filed: 1980-04-14 - Granted: 1983-12-20 - Earliest claimed: 1979-04-18 - Assignees: Dyform Engineering Limited - Inventors: Boris Netupsky - Web page: https://patentgrep.com/patent/US4420915A ## CPC - E04B 1/98: against vibrations or shocks (on foundations E02D31/08); against mechanical destruction, e.g. by air-raids (against incendiary damage only E04B1/94; finishing work therefor E04F; buildings withstanding earthquake or the like, shelters, arrangements of splintercatching walls E04H9/00) - E04B: GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS (border constructions of opening in walls, floors or ceilings E06B1/00; {electromagnetic shielding H05K9/0001}) ## Abstract A concrete wall bearing component having one or more relatively large failure panel sections therein each defined by a thin weakness band and being of such size as to blow out of the panel along the weakness band when subjected to a blast, while leaving enough of the panel to support the load normally supported by the panel, and a wall formed of said bearing components. The invention differs from the prior art in making lighter panels not by increasing the strength and thus the weight. ## Claims ### Claim 1 A large-panel concrete wall bearing component comprising a large concrete bearing panel to rest on a lower edge thereof on a support and to carry a load on an upper edge, said panel having at least one thin weakness band extending cross-sectionally between opposite faces of the bearing panel, said thin band comprising a plastic strip completely embedded in the concrete of the panel and having edges near but spaced inwardly from the panel faces and defining a portion of said bearing panel as a failure section, said thin band being weaker than the concrete of the bearing panel, and said failure section being of such size as to blow out of the panel along the weakness band when subjected to a blast while leaving enough of the bearing to continue to support said load. ### Claim 2 (depends on 1) A bearing component as claimed in claim 1 in which the weakness band of each failure section is spaced inwardly from the upper edge and two side edges of the bearing panel. ### Claim 3 (depends on 2) A bearing component as claimed in claim 2 in which each of said weakness bands is substantially of rectangular form having an upper edge and two side edges. ### Claim 4 (depends on 2) A bearing component as claimed in claim 2 comprising hinge means between an edge of the weakness section and the panel. ### Claim 5 (depends on 4) A bearing component as claimed in claim 4 in which said hinge means comprises a plurality of spaced-apart reinforcement bars embedded in the concrete of the bearing panel and each failure section thereof, said bars extending from the bearing panel into the failure section along one edge of the latter to act as a hinge therebetween in the event of a blow-out. ### Claim 6 A large-panel concrete wall bearing component comprising a plurality of large concrete bearing panels formed in a wall resting on lower edges thereof on supports and respectively carrying loads on their upper edges; each of said panels having at least one thin weakness band extending cross-sectionally between opposite faces of the bearing panel, said thin band comprising a plastic strip completely embedded in the concrete of the panel and having edges near but spaced inwardly from the panel faces and defining a portion of said bearing panel as a failure section, each thin band being weaker than the concrete of the respective bearing panel, and each failure section being of such size as to blow out of the panel along the weakness band when subjected to a blast, while leaving enough of the bearing panel to continue to support said load. ### Claim 7 (depends on 6) A bearing component as claimed in claim 6 in which each of said weakness bands in spaced inwardly from the upper edge and two side edges of the respective bearing panel. ### Claim 8 (depends on 7) A bearing component as claimed in claim 7 in which each of said weakness bands is substantially of rectangular form having an upper edge and two side edges. ### Claim 9 (depends on 7) A bearing component as claimed in claim 7 comprising hinge means between an edge of each weakness section and the panel thereof. ### Claim 10 (depends on 9) A bearing component as claimed in claim 9 in which each hinge means comprises a plurality of spaced-apart reinforcement bars embedded in the concrete of the bearing panel and each failure section thereof, the bars of each bearing panel extending from the panel into the failure section along one edge of the latter to act as a hinge therebetween in the event of a blow-out. ### Claim 11 (depends on 1, 2, 3) A bearing component as claimed in claim 1, 2 or 3 in which said bearing panel has a plurality of laterally-spaced failure sections therein, the concrete of the bearing panel forming vertical support columns at the sides of the failure sections. ### Claim 12 (depends on 9, 10, 11) A bearing component as claimed in claim 9, 10 or 11 in which each of said bearing panels has a plurality of laterally-spaced failure sections therein, the concrete of the respective bearing panel forming vertical support columns at the sides of said failure sections. ### Claim 13 A large-panel concrete wall bearing component comprising a plurality of large concrete bearing panels formed in a wall resting on lower edges thereof on supports and respectively carrying loads on their upper edges; each of said panels having at least one thin weakness band extending cross-sectionally between opposite faces of the bearing panel and defining a portion of said bearing panel as a failure section, each thin band being weaker than the concrete of the respective bearing panel, and each failure section being of such size as to blow out of the panel along the weakness band when subjected to a blast, while leaving enough of the bearing panel to continue to support said load, each of said weakness bands being spaced inwardly from the upper edge and the two side edges of the respective bearing panel, hinge means between an edge of each weakness section and the panel thereof, each hinge means comprising a plurality of spaced apart reinforcement bars embedded in the concrete of the bearing panel and each failure section thereof, the bars of each bearing panel extending from the panel into the failure section along one edge of the latter to act as a hinge therebetween in the event of a blowout.