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Building structure, especially air raid shelter
| Details |
Inventors: Paulsson, Jan-Erik H.; Blixt, Lars-Goran F.;
Assignee: Blixt; Lars-Goran Franklin (Lyckeby, SE)
Primary Examiner: Murtagh; John E.
Assistant Examiner:
Attorney, Agent or Firm: Beveridge, DeGrandi & Weilacher
A building structure, especially an air raid shelter is formed from prefabricated tubular concrete elements (10) and end wall elements (11), the tubular concrete elements (10) being clamped between the end wall elements (11) with the aid of prestressed prestressing means or ties (12). The tubular concrete elements (10) have at least one stiffening beam (17, 18) extending all around them and at least the interstices between successive stiffening beams are filled with in situ cast concrete (13) reinforced by means of a crossbar (24), which in situ cast concrete encloses the prestressed prestressing means or ties (12). Two or more rows of tubular concrete elements (10) with end wall elements (11) can be placed beside each other to form a large building structure, especially an air raid shelter in which the stiffening beams (17) on the adjoining tubular concrete elements (10) engage each other in a comb-like manner and constitute columns. |
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DETAILED DESCRIPTION We claim: 1.
An air raid shelter comprising a number of adjoining, prefabricated, reinforced, tubular concrete elements (10) and end wall elements (11) clamped together with the aid of prestressing means (12), wherein each of the tubular concrete elements (10) has at least one exteriorly, interiorly or both exteriorly and interiorly protruding, reinforced stiffening beam (17, 18) integral with the remaining concrete element and having holes (19) formed in the axial direction of the tubular concrete elements for the prestressing means (12) to pass through, which prestressing means are anchored to the end wall elements and serve to clamp together the tubular concrete elements (10) between the end wall elements (11), and wherein interstices are formed between the stiffening beams (17, 18) of adjoining concrete elements (10, 11) and said interstices are filled with reinforced in situ cast concrete (13) for permanent interconnection of the concrete elements (10, 11) and embedding of the prestressing means (12) so as to form prestressed concrete.
2.
An air raid shelter as claimed in claim 1, in which the tubular concrete elements (10) are of substantially square or rectangular cross-section, and wherein the prestressing means (12) are arranged in the region of the corners of the concrete elements (10).
3.
An air raid shelter as claimed in claim 1 or 2, wherein the tubular concrete elements (10) in their end surfaces have two defining flanges (29, 30) which protrude differently far and define an annular groove (31), the defining flange (29) closest to the stiffening beam (17, 18) of the concrete element being the shortest, while the adjoining concrete element has its longer defining flanges (30) placed close to each other in order to permit, on in situ concreting, introduction of concrete and reinforcement (25, 26) to form a locking tongue.
4.
An air raid shelter as claimed in claim 3, wherein the stiffening beams (17) on the outer side of the concrete elements (10) having protruding lugs (20) for the fastening of forms for in situ concreting
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