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Societe Centrale D'etudes Et De Realisations Routieres Scetauroute

J. Muller International

Scetauroute

Societe Anonyme Dite Societe Centrale D'etudes Et De Realisations

Societe Centrale D'etudes Et De Scetauroute Realisations Routiers

Societe D'etudes De Genie Civil Et De Techniques Industrielles

Jean M Muller

Gerard Sauvageot

Pierre Le Brun

Thierry Odievre

Process and apparatus for displaying, measuring the size of and counting individual inclusions in suspension in moving liquid metal using an ultrasound sensor including emission and reception devices. Using the emission device, a series of ultrasound beam pulses is emitted within the liquid metal, and echoes reflected by the inclusions are received using the reception device. The reflected echoes are successively acquired and processed, and displayed as images which are analyzed to count and measure the diameter of inclusions. The sensor is calibrated by selectively placing in a path defined by the beam pulses at least one control reflector having predetermined dimensions and a geometry stable over time, successively acquiring and processing reflected echoes from the control reflector, displaying the reflected echoes from the control reflector as images, and analyzing the control reflector echo images to determine a relationship between amplitude of the images and the control reflector dimensions.

Method and device for counting inclusions in a liquid metal bath with ultrasounds

An overpass bridge that can be used to replace an existing bridge and provide increased clearance over an existing roadway includes two opposed reinforced concrete edge beams positioned above and on either side of the deck surface. The inside wall of each edge beam is configured as parapet wall. The edge beams and the deck slab are post-tensioned with longitudinal tendons anchored at each end of the bridge. The bridge is built using an aligned series of precast concrete segments extending between the bridge abutments. Each segment has a set of transverse tendons extending from lower portions of one edge beam, through the deck slab, to a lower portion of the opposite edge beam. The bridge can be built in a step-by-step process. First, the segments are precast and longitudinal erection beams are extended between the abutments on which the bridge is to be built. The superstructure segments are transported across longitudinal erection beams to their final positions. When all the segments are in place, longitudinal tendons are installed through the segments, post-tensioned, and anchored at each end in proximity to the abutments. The erection beams are then removed and a wearing surface can be applied.

Channel bridge

A novel method for fabricating pretensioned concrete structures includes the steps of:

Method for fabricating pretensioned concrete structures

Structure for interconnecting two part, separated by an expansion joint,

Method of constructing a cable-stayed bridge whose deck (1) is composed of wo parallel series of voussoirs connected together by connecting members known as deltas (7) which carry at their top part (8) the anchorage points for the cable stays (12). When they are placed in position the bottom parts (9) of the successive deltas are fastened to rigid filling members (14), and auxiliary prestressing cables (13) are preferably installed which connect the top part (8) of a delta to the bottom part (9) of the following delta (7), said cables being approximately in line with the cable stays.

Method of constructing a cable-stayed bridge composed of an assembly of

A bridge of the cable-stay type, in particular of a very large span, the deck of which is supported by stays deflected by passing over towers (21). Some of the stays (22) are anchored on the deck at two points of the deck situated on either side of a same tower (21), and the central part of a span between two towers is supported exclusively by other stays (25) which, after having been deflected at the top of a tower, are each anchored in an anchor block (26). The tensile stress to which the central part of the deck is subjected under the effect of these stays (25) directed towards the tops of the two towers situated on either side of the span is compensated for by an axial compressive prestress.

Cable-stay bridge and method for construction thereof

A bridge construction system includes a first independent longitudinal truss positioned over a first bridge span, a second independent longitudinal truss positioned over a second bridge span, a gantry movably mounted on said trusses, the gantry having a first leg mounted to the first truss and a second leg mounted to the second truss, the gantry being drivable along the first and second trusses, a gantry drive for controllably driving the gantry along the trusses, a transverse trolley movably mounted on the gantry, the trolley being drivable along the gantry in a direction generally transverse to the longitudinal trusses, the trolley including a winch for lifting and carrying bridge components to be positioned along the bridge spans over which the longitudinal trusses are mounted, the trolley being selectively positionable over each of the bridge spans, and supports for mounting the longitudinal trusses to bridge components disposed along each of the bridge spans.

Construction equipment and method for precast segmental bridges

Cable-stayed bridge and construction process

Device for securing a cable to the concrete platform of a bridge, and

Bridge comprising a bridge floor and elements supporting said floor,

A bridge, the deck of which comprises two superimposed frames (4,5) each serving as a roadway. These frames are connected by diagonal connecting girders (6) slanting both relative to the vertical and relative to the length of the bridge and joining the edges of the upper and lower frames, and auxiliary connecting girders (7) situated in vertical planes passing through the edges of the lower frame. The prestressing cables (17) of a diagonal girder (6) are anchored to the edge of the upper frame, pass transversely through the lower frame, and then through the diagonal girder which is symmetrical therewith relative to the longitudinal vertical plane of symmetry of the bridge, and are anchored on the opposite edge of the upper frame.

Deck for wide-span bridge

A concreting rig for use in construction by the cantilever method of an elevated, elongated civil engineering work, such as a bridge, elevated road, roof or the like, by in situ concreting longitudinally consecutive sections of the work with the rig overhanging beyond the already completed portion of the work, comprises a rigid structural frame which is longitudinally pressed against the already completed portion of the work, by means of tensioned prestressing members. The rig bears on the already completed work portion by way of at least three abutment devices each of which engages with a complementarily-shaped locating print in the completed work portion, means being provided for predetermining the position of each locating print in dependence upon the geometric characteristics of the work and the position therein, of the section to be concreted.

Growing community of inventors

Suresnes, France

Jean M Muller