CA1176071A
Expired / Lapsed
CA
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Prestressed concrete structure, a method of producing this structure and elements for implementing the method
Assignee: Bouygues SA
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Filing: 1981-11-25
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Granted: 1984-10-16
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Expires: 2001-11-25
Abstract
Abstract ABSTRACT This invention relates to a prestressed concrete structure which behaves like a hollowed out slab. The structure combines a lattice work structure and a prestress by external cable, maximally optimizing the advantages of these two techniques. The Figure represents a part of the floor of a bridge according to the present invention. The floor comprises to tables 6 and 7 which are joined by a lattice work composed of pyramids P. Prestressing cables 8, 8' and 9' pass between the tables outside the concrete of the bars of the pyramids. The present invention is used for the construction of bridges, roofings and floors. Figure 15
Inventors
- 👤 Pierre Richard
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-11-07 22:54
CPC Classifications
E; E01; E01D; E01D2/00; E01D2/04; E01D2101/00; E01D2101/20; E01D2101/24; E01D2101/26; E01D2101/28
Claims Analysis
Total Claims: 43
Claim 1
Independent Claim
127 words
A prestressed concrete structure behaving like a hollowed out slab, comprising two reinforced or prestressed concrete slabs which are positioned opposite each other and are connected by a lattice work of reinforced or prestressed concrete positioned in the volume between the slabe, the lattice work being composed of prefabricated elements comprising at least one group of at least two bars and at least one cross piece positioned along the three sides of a triangle, the meeting point of the two bars forming the apex of the triangle, general prestressing cables of the structure being anchored at their ends in concrete solid masses positioned between the two slabs and being integral with at least one of the slabs, said cables remaining outside the concrete of the lattice work.
Claim 2
Dependent Claim
127 words
A prestressed concrete structure behaving like a hollowed out slab, comprising two reinforced or prestressed concrete slabs which are positioned opposite each other and are connected by a lattice work of reinforced or prestressed concrete positioned in the volume between the slabe, the lattice work being composed of prefabricated elements comprising at least one group of at least two bars and at least one cross piece positioned along the three sides of a triangle, the meeting point of the two bars forming the apex of the triangle, general prestressing cables of the structure being anchored at their ends in concrete solid masses positioned between the two slabs and being integral with at least one of the slabs, said cables remaining outside the concrete of the lattice work.
Claim 3
Dependent Claim
14 words
A structure as claimed in claim 1, wherein said cables pass inside said volume.
Claim 4
Dependent Claim
19 words
A structure as claimed in claim 1 or 2, wherein said cables pass in the vicinity of said slabs.
Claim 5
Dependent Claim
11 words
A structure according claim 1, wherein the lattice work forms pyramids.
Claim 6
Dependent Claim
14 words
A structure according to claim 1, wherein the lattice work is composed of bars.
Claim 7
Dependent Claim
39 words
A structure according to claim 5, wherein concrete, which is in a section of said volume by a median plane which is substantially parallel to the slabs, is provided to at least 50% by the bars of the triangulation.
Claim 8
Dependent Claim
33 words
A structure according to claim 1, 4 or 5, wherein the prestressing cables undergo deflections in the solid masses and/or in nodes formed at the intersections of the lattice work and the slabs.
Claim 9
Dependent Claim
60 words
A structure according to claim 1, 4 or 5, wherein the prestressing cables undergo deflections in the solid masses and/or in nodes formed at the intersections of the lattice work and the slabs and wherein at least one of the lower slab, the upper slab and some nodes have grooves or passages for guiding the passage of the prestressing cables.
Claim 10
Dependent Claim
24 words
A structure according to claim 1, 4 or 5, wherein some of the solid masses comprise a slab in which the prestressing cables pass.
Claim 11
Dependent Claim
58 words
A structure according to claim 1, 4 or 5, wherein some of the solid masses comprise a slab in which the prestressing cables pass and some solid masses comprise on both sides of this slab oblique slabs which participate in transmitting the anchoring strain of the cables to the structure and produce the triangulation of the solid mass.
Claim 12
Dependent Claim
32 words
A structure according to claim 1, 4 or 5, wherein the prestressing cables comprise cables positioned along at least one of the length of the structure and the width of the structure.
Claim 13
Dependent Claim
40 words
A structure according to claim 1, 4 or 5, wherein within each lattice work bar section perpendicular to the axis of the bar, the ratio between the largest and the smallest dimension of the section is not greater than 6.
Claim 14
Dependent Claim
23 words
A structure according to claim 1, 4 or 5 wherein the bars of the lattice work are from 1 to 10 meters long.
Claim 15
Dependent Claim
27 words
A structure according to claim 1, 4 or 5, wherein the bars of the lattice work have a cross section of from 0.0004 to 0.5 m .
Claim 16
Dependent Claim
24 words
A structure according to claim 1, 4 or 5, wherein at least one of the lower slab and the upper slab are hollowed out.
Claim 17
Dependent Claim
70 words
A concrete structural member to be used to partially define a lattice work separating two concrete slabs in a prestressed concrete structure comprising at least two bars and at least one cross piece positioned along the three sides of a triangle, the meeting point of the two bars forming the apex of the triangle, said at least two bars and said one crosspiece being cast as an integral concrete unit.
Claim 18
Dependent Claim
70 words
A concrete structural member to be used to partially define a lattice work separating two concrete slabs in a prestressed concrete structure comprising at least two bars and at least one cross piece positioned along the three sides of a triangle, the meeting point of the two bars forming the apex of the triangle, said at least two bars and said one crosspiece being cast as an integral concrete unit.
Claim 19
Dependent Claim
17 words
A concrete structural member as claimed in claim 16, wherein said at least two bars are perpendicular.
Claim 20
Dependent Claim
19 words
A concrete structural member as claimed in claim 16, wherein said bars are from 1 to 10 meters long.
Claim 21
Dependent Claim
25 words
A concrete structural member as claimed in claim 16, 17 or 18, wherein said bars have a cross section of from .004 to .5 m2.
Claim 22
Dependent Claim
25 words
A concrete structural member of claim 16, 17 or 18, wherein said cross piece extends beyond the meeting point thereof with one of the bars.
Claim 23
Dependent Claim
85 words
A concrete structural lattice for use in separating and securing two reinforced concrete slabs, said lattice being of reinforced concrete to be positioned between such slabs and being composed of prefabricated elements comprising at least one group of at least two bars and at least one cross piece positioned along the three sides of a triangle, the meeting point of the two bars forming the apex of a triangle, said at least two bars and said one crosspiece being cast as an integral concrete unit.
Claim 24
Dependent Claim
85 words
A concrete structural lattice for use in separating and securing two reinforced concrete slabs, said lattice being of reinforced concrete to be positioned between such slabs and being composed of prefabricated elements comprising at least one group of at least two bars and at least one cross piece positioned along the three sides of a triangle, the meeting point of the two bars forming the apex of a triangle, said at least two bars and said one crosspiece being cast as an integral concrete unit.
Claim 25
Dependent Claim
14 words
A concrete structural lattice as claimed in claim 21, wherein the lattice forms pyramids.
Claim 26
Dependent Claim
19 words
A concrete lattice as claimed in claim 22, wherein said bars are from 1 to 10 meters in length.
Claim 27
Dependent Claim
24 words
A concrete lattice as claimed in claim 20, 21, or 22, wherein said bars have a cross section of from .004m2 to .5 m2.
Claim 28
Dependent Claim
29 words
A concrete lattice as claimed in claim 21, 22 or 23, wherein said bars are 2 to 6 meters in length and are .02m2 to .1m2 in cross section.
Claim 29
Independent Claim
21 words
A method of forming the structure of claims 1, 4 or 5 by prefabricating said lattice and subsequently forming said slabs.
Claim 30
Independent Claim
96 words
A method of manufacturing a concrete structure having two reinforced or prestressed concrete slabs which are positioned opposite each other and are connected by a lattice work of reinforced concrete positioned in the volume between the slabs, said lattice work being composed of prefabricated elements comprising at least one group of at least two bars and at least one cross piece positioned along the three sides of a triangle, the meeting point of the two bars forming the apex of the triangle, including the steps of prefabricating said lattice work and subsequently securing said slabs thereto.
Claim 31
Independent Claim
96 words
A method of manufacturing a concrete structure having two reinforced or prestressed concrete slabs which are positioned opposite each other and are connected by a lattice work of reinforced concrete positioned in the volume between the slabs, said lattice work being composed of prefabricated elements comprising at least one group of at least two bars and at least one cross piece positioned along the three sides of a triangle, the meeting point of the two bars forming the apex of the triangle, including the steps of prefabricating said lattice work and subsequently securing said slabs thereto.
Claim 32
Dependent Claim
36 words
A concrete structural lattice of claim 21, wherein some of the cross pieces of the lattice work elements follow each other forming a line which extends over part or all of the length of a slab.
Claim 33
Dependent Claim
20 words
A structure according to claim 4 or 5, for the construction of an element of the floor of a bridge.
Claim 34
Dependent Claim
24 words
A concrete structure lattice as claimed in claim 21, 22 or 23 for the construction of an element of the floor of a bridge.
Claim 35
Dependent Claim
18 words
A structure according to claim 1, 4 or 5 for use in the construction of a roofing element.
Claim 36
Dependent Claim
18 words
A concrete structural lattice as claimed in claim 21, 22 or 23 for use as a roofing element.
Claim 37
Dependent Claim
15 words
A structure according to claim 1, 4 or 5 for use as a flooring element.
Claim 38
Dependent Claim
15 words
A structure according to claim 21, 22 or 23 for use as a flooring element.
Claim 39
Dependent Claim
16 words
A method according to claim 27, including positioning lattice work elements according to a pyramid configuration.
Claim 40
Dependent Claim
54 words
A method according to claim 27, including prefabri-cating at least one slab comprising reserves, positioning lattice work elements on the slab and introducing some peaks into said reserves and casting concrete into said reserves around said peaks to form nodes and joining the slab and the lattice work elements into a movable rigid unit.
Claim 41
Dependent Claim
30 words
A method according to claim 35, including positioning some cross pieces of the lattice work elements to form a part of the casing of the other slab of the structure.
Claim 42
Dependent Claim
34 words
A method according to claim 37, including the use of casings which are slid parallel to the length of the construc-tion, between the lattice work elements, to complete the casing of said other slab.
Claim 43
Dependent Claim
20 words
A concrete structural lattice as claimed in claim 21, wherein said elements are generally the shape of a right-angled triangle.
References Cited (Backward Citations)
No citation records indexed.
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