Static molds – In situ construction engineering type or building type-mold... – Forming building structure
Patent
1990-10-01
1992-06-30
Housel, James C.
Static molds
In situ construction engineering type or building type-mold...
Forming building structure
249 43, 249 47, 249190, 249192, 249195, 249216, 2492191, E04G 902, E04G 1704
Patent
active
051256185
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a formwork means, comprising formwork members for providing continuous surfaces on one or both sides of a casting cavity, and connecting means for connecting boarding members to form a formwork surface.
It is a special object of the present invention to provide a formwork means permitting a number of combinations as regards design and adaption. The formwork means should satisfy demands for few units, lightweight units or components, great strength, flexibility as regards design and adaption, simple mounting with or without utilization of a crane, and it should be possible to erect the formwork without use of tacks or the like. The formwork means should also be well suited for storage and simple in transport.
A special object of the formwork means is that it should be designed to permit the form stay pressure to be distributed in an advantageous manner all over the individual boarding members, so that maximum absence of moment in ends of formwork members is achieved. This is advantageous for connecting formwork members and in view of alignment beams which are mounted over the formwork member joints. According to the invention a formwork means is, thus, proposed, which comprises formwork members for building continuous surfaces on one or both sides of the casting cavity, and connecting means for connecting formwork members to form a formwork surface. The invention is characterized by the fact that a formwork member comprises a box shaped structure with a full wall (skin) on one side, whereas the other side has longitudinal and transversal grooves or channels, which are open towards the respective edges of the formwork member, with a through opening in the skin in each real or imagined crossing between longitudinal and transversal channels, and with a hole and an adjacent elongated hole in the channel walls at the edges of the formwork member, which holes/elongated holes form fastening means for the connecting means, that the connecting means are rod-shaped members which fit into said channels and are designed to be locked onto and connect adjacent formwork members by the aid of said holes/elongated holes, and by the fact that each formwork member has an associated arm cross to be placed on said channel cross, each arm cross having a central through opening which upon being placed is aligned with said through opening in the plate in the cross, and with the arms of said arm cross being provided with abutment projections on one plane side for abutment against the channel tops.
The box-shaped structure provides a relatively rigid formwork member. Said grooves or channels indicate how to place connection means as well as the reinforcing arm crosses. The abutment projections on the plane side of the arm cross provide for the desired distribution of the stay force to selected points on the boarding member. Utilization of arm crosses is also advantageous due to the fact that they compensate for the weakening which will be a structural consequence of the crossing channels. The channels permit a locking connection which is free of moment and can also be adjusted in length, and the rod shaped members (locking arms) to follow the framework sitting in the channels. Transmission of forces between boarding members is most advantageous because it occurs utilizing the frame members extending in the direction of forces.
The formed channels may advantageously also be used for placing wood elements which project from the formwork member, e.g. in connection with adaption to the terrain. The transition region is then boarded in a conventional manner by the aid of boards which are cut and secured to the wood elements. The crossing channels or grooves may weaken the formwork member, but this is fully compensated by reinforcement and load distribution provided by the arm crosses, absence of moments being achieved in the channel crossings as well. In an especially advantageous formwork means the length of the formwork member is twice its width, said member has two symmetrically arranged real or imagined chann
REFERENCES:
patent: 2480840 (1949-09-01), Dicus
patent: 2948046 (1960-08-01), Imonetti
patent: 3124858 (1964-03-01), Blonde
patent: 3385555 (1968-05-01), Williams
patent: 3550898 (1970-12-01), Ursini
patent: 3862737 (1975-01-01), Fuston, Jr.
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