Static structures (e.g. – buildings) – Vertically curved arch with terminal support
Patent
1999-03-17
2000-12-19
Kent, Christopher T.
Static structures (e.g., buildings)
Vertically curved arch with terminal support
52 89, 525821, 52436, 52442, 525871, 405124, 405125, 405126, E04B 132
Patent
active
061613428
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a prefabricated concrete element intended to be assembled with other similar elements in order to form an arched wall of a civil engineering structure.
It is well known to arrange a passage under an embankment, in particular for a road traffic lane or for a watercourse, by means of a civil engineering structure comprising the arched wall.
The document entitled "Passages inferieurs voutes" ["Arched Underpasses"] of 1978, published by the General Interior Transport Directorate of the French Ministry of Transport, describes such a civil engineering structure, consisting of a succession of curve shaped elements arranged side by side, forming the arched wall of the structure, and a raft or two parallel bearing sills supporting the curve shaped elements.
For conduits of small cross-section, the curve shaped elements forming the arch of the structure may substantially be semi-tubular in cross-section. Unfortunately, when the width at the base of the structure exceeds approximately five meters and the height exceeds approximately three meters, manufacturing and transporting the elements on site becomes practically impossible. In that case, the arched wall is produced, on one and the same segment of the structure, by assembling a plurality of the curve shaped elements.
Typically, the curve shaped elements each represent one half of the cross-section of the arched structure. The curve shaped elements bear against one another in the region of a keystone and are assembled by means of a concrete capping piece cast in situ.
According to a known assembly technique, the curve shaped elements have bearing faces provided with complementary profiled parts capable of interlocking and comprise emergent reinforcements projecting from their exterior.
The curve shaped elements bear directly against one another by being mutually wedged as a result of the interlocking of the profiled parts. The wedging of the interlocking parts allows for self-positioning of the curve shaped elements when the elements are assembled, thereby providing the advantage of reducing or even
The emergent reinforcements of the curve shaped elements are subsequently connected by means of longitudinal reinforcements and are then embedded in cast concrete forming the assembly capping piece.
The capping piece is then arranged above the wall of the curve shaped elements. Unfortunately, the position of the capping piece is not conducive to the work of the arched wall when the arched wall undergoes stresses transmitted by the mass of the embankment or by the movement of the ground. In fact, in response to the above-described stresses, the curve-shaped elements deform and tend to pivot relative to one another about an axis located substantially at mid-height of their bearing faces. The curve shaped elements then transmit very high transverse stresses to the capping piece.
This frequently results in the appearance of cracks in the capping piece or in the curve shaped elements. The cracks considerably impair the resistance of the structure over a period of time.
Moreover, the construction of a longitudinal formwork in the upper part of the structure for the casting of the capping piece is a relatively difficult and complex operation.
The above-mentioned document of 1978 describes elements which are interrupted at a distance from the keystone and which comprise reinforcements projecting in the extension of their wall. Scaffolding having a height corresponding to the height of the arch is installed on the raft in line with the keystone. The scaffolding supports a plate having a curvature similar to the curvature of the arch. The curve shaped elements are subsequently placed on the raft and shored in such a way that the upper edges of each element face one another and come into contact with the plate. Then, the longitudinal reinforcements are connected to the reinforcements of the various elements, and the assembly as a whole is embedded in cast concrete. The plate forms a formwork base.
Thus, making it possible to o
REFERENCES:
Passages inferieurs voutes ["Arched Underpasses"] of 1978, published by the General Interior Transport Directorate of the French Ministry of Transport .
Barbier Laurent Jean
Melo Ferreira Alberto Antonio
Dorsey Dennis L.
Kent Christopher T.
Samflo
LandOfFree
Prefabricated concrete element for building a civil engineering does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Prefabricated concrete element for building a civil engineering , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Prefabricated concrete element for building a civil engineering will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-262327