Freyssinet International (stup)

Soletanche Freyssinet

Freyssinet

Bernard Basile

J&eacute;r&ocirc;me Stubler

Eric Laurent

Jerome Stubler

Jérôme Stubler

Gilles Hovhanessian

Bruno Lancia

Jean-Baptiste Domage

S&eacute;bastien Lardy

Philippe Salmon

Mauro Sartori

Charles Cynober

The invention proposes a system for obtaining information relating to a pipe () conveying a flow of fluid (), and/or relating to the fluid. This system comprises a module () comprising means () of acquiring data, subsequent analysis of which makes it possible to obtain information relating to the pipe and/or the fluid, and means () of storing the data which said data acquisition means acquire, the self-contained module being arranged to be pushed by the fluid flow after being introduced into the pipe. It also comprises a mechanical link () which is connected to the self-contained module and accessible from outside the pipe.

System for obtaining information relating to a pipe, and associated method

The invention concerns a system for detecting a rupture inside a portion () at least of one structure, delimited by a first () and a second () reference points of the structure, said portion having a predetermined stiffness in the absence of rupture and being subjected to a tensile or compressive stress (F). The method includes the following steps: detecting at least one length variation inside the portion of the structure, in response to a variation (?F) of the tensile or compressive stress applied to said portion; deducing from the detected variation length, the existence or not of a rupture inside said portion of the structure.

Method for detecting a rupture inside a structure and system for implementing said method

The invention concerns a method for assisting an operator in surveying defects on a building site which consists in providing him with a portable terminal displaying images of the works and inputting data concerning his observations, under the control of a software operating with a database of the works, comprising files defining the images displayed on the terminal graphic interface, data structures relating respectively to types of defects liable to occur in the works, and if any, descriptive data of defects previously observed on the works, organized in accordance with the associated data structures. In response to the selection of a type of fault by the operator, said software activates a dialogue, by means of the associated data structure, to input parameters describing said defects, which are used to constitute a representation of the defect on the image displayed on the graphic interface and to update the data describing the defects.

Method and devices for assisting in the control of building operations

Displacement measuring means are fixed onto the structural element. A hole is drilled in the measurement zone and a supply pressure is applied to a flat actuator introduced into the hole. The displacements measured are analyzed as a function of the supply pressure to determine the stress from a supply pressure which roughly compensates for the deformation of the element due to the drilling of the hole. The measuring means comprise two arms that are fixed to the element at two respective anchoring points aligned parallel to a measuring direction, and at least two displacement sensors mounted on the arms on each side of the anchoring points to measure the variations in separation between the anchoring points. The arms leave between them a gap through which the hole is drilled at a central position with respect to the anchoring points.

Method for measuring stress in a structural element

In order to measure in situ the residual tension F,of a pre-stressed bar braced between two anchorages, the two-way propagation time T,of an ultra-sonic wave between the two ends of the bar is measured, and F,is evaluated by the formula F,&equals;F,&plus;k,.(T,&minus;T,). During a preliminary calibration carried out without demounting, the bar is subjected to a variable traction effort F. For each value, the two-way propagation time T of an ultra-sonic wave between the two ends of the bar is measured, a curve associating the effort F with the time T is recorded, and the constant T,is determined as being the two-way propagation time measured for F&equals;0, the curve is approached in the neighborhood of the value F&equals;0 by a first straight line of slope k,, an upper portion of the curve is approached by a second straight line of slope k,, the constant F,is determined as being the traction effort F corresponding to the point of intersection of the first and second straight lines, and the constant k,is determined according to the relationship,/k,&equals;(,/k,)&minus;(,/k,).

Method for measuring by ultra-sound the residual tension of a pre-stressed bar

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Plaisir, France

Bernard Basile