EP0172092A1 - Unter einem Horizontalbalken, welcher auf einem Gebäude ruht, angebrachte schlanke Metallkonstruktion zur Erdbebensicherung - Google Patents

Unter einem Horizontalbalken, welcher auf einem Gebäude ruht, angebrachte schlanke Metallkonstruktion zur Erdbebensicherung Download PDF

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Publication number
EP0172092A1
EP0172092A1 EP85401537A EP85401537A EP0172092A1 EP 0172092 A1 EP0172092 A1 EP 0172092A1 EP 85401537 A EP85401537 A EP 85401537A EP 85401537 A EP85401537 A EP 85401537A EP 0172092 A1 EP0172092 A1 EP 0172092A1
Authority
EP
European Patent Office
Prior art keywords
horizontal
carriage
bridge
structure according
suspended
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP85401537A
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English (en)
French (fr)
Inventor
Gérard Piron
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SOM DELATTRE
Original Assignee
SOM DELATTRE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SOM DELATTRE filed Critical SOM DELATTRE
Publication of EP0172092A1 publication Critical patent/EP0172092A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C17/00—Overhead travelling cranes comprising one or more substantially horizontal girders the ends of which are directly supported by wheels or rollers running on tracks carried by spaced supports

Definitions

  • the invention relates to a slender metal structure with anti-seismic protection suspended below a horizontal beam resting on the structure of a building.
  • a bridge bridge moving over the fuel pool in the combustible building.
  • a walkway bridge comprises a conventional overhead crane whose horizontal main beams support in the upper part a carriage for handling fuel assemblies moving along the entire length of the beams.
  • This carriage comprises means for picking up and lifting the fuel assemblies and the movement of the traveling crane and the carriage makes it possible to reach the positions for picking up the fuel assemblies in their storage cell, inside the fuel pool.
  • Such a walkway bridge also comprises unt: a slender vertical structure constituted by columns of wire mesh, the upper part of which is rigidly fixed under the beam of the overhead crane and the lower part of which supports a walkway parallel to the beam of the overhead crane and placed just at - above the upper level of the spent fuel pool.
  • This gateway allows operators to control and command fuel handling operations.
  • the currently known walkway bridges generally comprise three vertical columns of wire mesh, two columns each fixed to a longitudinal end of the bridge and the overhead crane and a central column of greater rigidity ensuring the recovery of transverse forces thanks to metal profiles of bracing.
  • the horizontal beam of the overhead crane, the columns and the gangway constitute a very tall rigid structure suspended under the beam of the overhead crane.
  • the height under the overhead crane of the suspended structure is of the order of nine meters for a bridge length of the order of thirteen meters.
  • the entire structure rests via the overhead crane on the fuel building.
  • the bridge bridge In the event of an earthquake causing displacement of the building structure, the bridge bridge also undergoes alternative displacements transmitted via the rails and rollers of the traveling crane.
  • the high-rise structure constituting the bridge bridge is very little able to withstand the corresponding stresses. There may be a deformation of the structure of the bridge bridge or even a rupture of the rigid connection between the vertical columns and the traveling bridge of this bridge bridge. The break and fall of all or part of the bridge bridge can cause very significant damage and the repair or replacement of this structure can be very long and very costly.
  • the object of the invention is therefore to propose a slender metallic structure with anti-seismic protection, suspended below a horizontal beam resting on a building, of the type comprising at least one rigid vertical column fixed by its upper part under the horizontal beam and connected at its lower part to a rigid horizontal element, this metal structure having to withstand strong earthquakes without inducing stresses in the horizontal support beam and having to exhibit sufficient earthquake strength to maintain the horizontal element in a fixed position inferior.
  • connection means allowing movement of the structure, in the event of an earthquake, at least in its lower part, in two main directions of the horizontal plane, these connecting means being associated with at least one element for stiffening the structure ensuring its rigid behavior in normal operation and liable to disappear under the effect of the stresses due to an earthquake, to release the mobile connecting means .
  • the upper part of the beam 1 carries rails 6 on which a carriage 8 moves carrying the winch for lifting and handling the fuel assemblies.
  • the horizontal beam 1 and the carriage 8 move above the fuel pool 9 so as to be able to access, with the handling tool associated with the winch, all the fuel assemblies stored in this pool 9.
  • the gateway 10 allows operators to control and command fuel handling operations, among other things.
  • the columns 11 and 12 disposed at the ends of the bridge and of the beam 1 of the overhead crane are formed by vertical elements braced in the plane perpendicular to that of the view, ensuring the stability of the bridge 10 in the direction y'y.
  • the central column 13, wider than the columns 11 and 12, comprises bracing elements 14 in the plane of the view, making it possible to take up the transverse forces and ensuring the stability of the bridge 10 along x'x.
  • connections between columns 11, 12 and 13 and the beam 1 as well as the connections between the lower part of these vertical columns and the gangway 10 are entirely rigid so that the gangway bridge has no degree of freedom to deform in the event of external stresses such as those accompanying an earthquake. The forces are therefore transmitted in full to the beam 1 and the suspended structure of great height is likely to deform significantly.
  • the links between the gangway and the beam 1 can even break in the event of earthquakes of large amplitude.
  • FIG 2 we see the building 20 of the fuel pool 21 of the fuel building of the nuclear power plant above which there is arranged a bridge bridge comprising a traveling bridge, the horizontal beam 22 of which moves on rails 23 each carried by a portion 26 projecting from the fuel pool building.
  • the upper part of the beam 22 carries rails 27 on which a carriage 28 moves carrying the hoist for lifting and handling the fuel assemblies.
  • the framework suspended under the beam 22 of the traveling crane comprises two vertical columns of great height 24 and 25 and a gangway 30 rigidly fixed to the lower part of the vertical columns in wire mesh 24 and 25.
  • each of the columns 24 and 25 with a rectangular horizontal section consists of a wire mesh comprising four vertical elements 31 over the entire height of the column, spacers 32 and bracing elements 33.
  • This structure without a central column similar to column 13 shown in FIG. 1 relating to a gangway bridge according to the prior art makes it possible to simplify the construction of the bridge bridge and to optimize its design.
  • the upper part of the wire mesh columns 24 and 25 is connected to the lower face of the horizontal beam 22 by means of devices which will be described with reference to both Figures 2 and 3 and Figures 4, 5, 6 and 7.
  • FIGS. 3 and 6 it can be seen that the vertical elements 31 of the columns 24 and 25 are connected at their upper part, two by two, to inclined elements 34 themselves connected at their top by a pair of yokes 35 constituting two suspension triangles of the column under the beam 22.
  • the beam 22 carries at its lower part above each of the columns 24 and 25, a frame-shaped structure visible in FIG. 4 comprising two profiled longitudinal uprights 36a and 36b and a cross-member with a closed section 37.
  • This structure is suspended under the beam 22 by means of U-shaped profiles 38 comprising reinforcing elements, welded to the external surface of the longitudinal elements 36a and 36b of the frame.
  • the longitudinal elements 36a and 36b bear on two opposite internal faces of the rolling tracks 39 for supporting and guiding the rollers 40 of a carriage 41 from which the lower framework is suspended by means of its columns 24 and 25.
  • the carriage 41 is produced in the form of a profiled frame comprising two longitudinal members 42a and 42b, a set of crosspieces 43 and a support plate 44 at one of its ends crossed by a rod 45 parallel to the longitudinal direction of the carriage 41.
  • the rod 45 also passes through the square section beam 37 and is used for centering a set of elastic washers 47 constituting a spring for retaining and returning the carriage in abutment by one of its sides on the front plate 44 of the carriage and by its other side on the beam 37 secured to the fixed structure 36a, 36b.
  • the carriage 41 also carries two vertical yokes 49 reinforced at their lower part and assembled in an articulated manner, each with a set of two yokes 35 constituting the upper part of the suspension triangle on one of the sides of the vertical column 25.
  • a pin 50 is introduced for this purpose into openings provided in the yokes 49 and 35 aligned and fixed in an axial position relative to these yokes.
  • a fixing piece 52 and a fixing piece 53 are fixed vertically to one another, at the top of the column 25, between its two suspension triangles and under the carriage 41 respectively, these fixing parts 52 and 53 being connected by an assembly comprising a connecting rod 55 and a shear pin 54 allowing the articulations of the suspension yokes 35 and 49 of the column 25 to be locked under the carriage 41.
  • a carriage symmetrical with the carriage 41 which has just been described, provided with means for suspending the vertical column 24 is disposed above this column as it is visible in FIG. 2.
  • the walkway and its support frame are therefore suspended under the beam 22 of the traveling crane by means of mobile connection means arranged at each of its ends, at the top of a vertical column.
  • Each of the connecting means corresponding to one of the columns of the gangway bridge comprises two articulations of horizontal axis locked in rotation by a shear pin and a carriage 41 whose displacement guide means fixed under the beam 22 are parallel to the axes of articulation of the column suspension means.
  • the carriage is held in place by an elastic assembly which can deform to allow movement of the carriage in the event of stress exceeding a certain level as shown in Figure 7.
  • the carriages 41 arranged above the column 24 and above the column 25 respectively are mounted symmetrically with respect to the vertical plane of symmetry of the gangway bridge.
  • the sets of washers 47 constituting return springs of the carriages 41 are therefore both located on the inside of the structure, that is to say to the left of column 24 and to the right of column 25
  • the assembly 47 associated with the column 24 is therefore caused to deform for horizontal stresses exerted on the bridge bridge, in the longitudinal direction of the bridge (or direction x'x), in the direction from the right. towards the left.
  • the assembly 47 associated with the carriage 41 disposed above the column 25 is caused to deform for horizontal stresses exerted in the direction x'x and in the direction from left to right.
  • the assemblies 47 located above the column 24 and above the column 25 respectively are stressed alternately.
  • the device In FIG. 7a, the device is in its rest position corresponding to normal operation of the bridge bridge, the latter then perfectly following the movements of the bridge crane.
  • the device In FIG. 7b, the device is in its position corresponding to a stress of intensity greater than the triggering threshold of the elastic assembly 47, in the direction x'x applied to the bridge bridge.
  • the carriage 41 then moved to the right by compressing the elastic assembly 47.
  • FIG. 7c the device is shown in a later phase, the stress along x'x having been canceled or reversed.
  • the relaxation of the elastic assembly 47 then causes the carriage 41 to return to the left, beyond its rest position.
  • the whole suspended framework of the gangway bridge can be caused to move in translation in the direction x'x by deforming the elastic assemblies 47, as can be seen in FIGS. 7b and 7c and in rotation around the axes 50, after breaking of the pins 54.
  • the level of the stresses allowing the deformation of the assemblies 47 and the rupture of the shear pins 54 are determined so that the release of the mobile connections only occurs in the event of an earthquake which can damage the structure of the bridge.
  • the strength of an earthquake can be characterized by the acceleration communicated to the structure undergoing this earthquake, this acceleration being expressed as a function of the acceleration of gravity g.
  • the limit value may be chosen to be the value O.lg to determine the triggering limit of the elastic elements 47 and the breaking limit of the shear pin 54.
  • this value is on the one hand greater than the value of the accelerations during movements of the bridge bridge in normal operation and on the other hand less than the accelerations undergone by the structures in the case of earthquakes which can cause damage to these structures.
  • the bridge bridge has a completely rigid behavior and therefore remains completely stable in normal operation, for the unloading and recharging operations of the nuclear reactor, but that the connections between the bridge bridge and the crane beam resting on the nuclear reactor building are released in the event of an earthquake, so that the structure begins to move in translation and swing under the effect of horizontal stresses due to the earthquake. This structure is therefore not subjected to stresses which can cause its deformation or destruction and no excessive stress is transmitted to the beam of the overhead crane under which the lower framework is suspended.
  • a platform 61 is provided (FIG. 2) served by an access ladder 60, to carry out the operations or the maintenance of these means. mobile links.
  • the structure according to the invention has the advantage of being perfectly rigid and perfectly stable in normal operation and free to move when it is subjected to stresses such as those accompanying an earthquake.
  • the transition from the stable and rigid state to the free state of this structure is done automatically by unlocking means adjusted to a perfectly determined level of constraints.
  • the elastic assemblies 47 and the pins 54 can indeed be very easily determined and adapted to the case of the local conditions of use of the structure.
  • the elastic devices mentioned may be associated with an energy dissipation element such as a damping cylinder or dashpot.
  • the translational guidance in the device can be achieved other than by the carriage-roller-rolling surface assembly, for example by ball guide bushings.
  • Double joints can also be used to make the connection between the top of the vertical columns of the bridge and the crane beam, these double joints comprising a joint having an axis in the direction x'x and an axis in the direction y ' y, for balancing the structure around these axes, in the event of stresses exceeding a certain level. It is however necessary in this embodiment to also provide links articulated around axes arranged in the direction y'y at the bottom of the vertical columns for their connection with the bridge. These joints can be immobilized by means of shear pins as it has been described, each associated with a joint or even immobilized in their assembly by an oblique element of stiffening of the whole of the bridge bridge comprising a rupture part. All of the mobile connections of the bridge bridge are then released by rupture of this single part, for the swinging around the axis x'x and around the axis y'y of the suspended structure of the bridge bridge.
  • connecting means between the vertical columns of the bridge bridge and the horizontal beam of the traveling bridge mainly of the type with carriages and elastic return assemblies, two carriages being superimposed for each of the columns, one of which has a possibility of displacement in the direction x'x and the other in the direction y'y.
  • One of the carriages is rigidly suspended from the lower part of the gantry crane and the other carriage to which the vertical column of the corresponding bridge bridge is rigidly connected is suspended from the first carriage.
  • the structure of the bridge bridge can be different from that which has been described and in particular it is possible to use a set of three vertical columns all connected by mobile connections to the horizontal beam of the overhead crane, only the central column ensuring the recovery transverse forces and the rigidity of the bridge.
  • the structure described in the embodiment has greater simplicity and greater efficiency in terms of stiffening the structure.
  • the structure according to the invention can be applied in all cases where an element must be suspended under a mobile horizontal beam or not resting on a building constructed in an area exposed to earthquakes.
  • the invention can therefore be applied in metal construction in general, in the field of building for industrial or non-industrial use and in particular in the construction of factories located in regions exposed to earthquakes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bridges Or Land Bridges (AREA)
EP85401537A 1984-07-26 1985-07-25 Unter einem Horizontalbalken, welcher auf einem Gebäude ruht, angebrachte schlanke Metallkonstruktion zur Erdbebensicherung Withdrawn EP0172092A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8411857A FR2568235B1 (fr) 1984-07-26 1984-07-26 Structure metallique elancee a protection antisismique suspendue en dessous d'une poutre horizontale reposant sur un batiment
FR8411857 1984-07-26

Publications (1)

Publication Number Publication Date
EP0172092A1 true EP0172092A1 (de) 1986-02-19

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ID=9306519

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85401537A Withdrawn EP0172092A1 (de) 1984-07-26 1985-07-25 Unter einem Horizontalbalken, welcher auf einem Gebäude ruht, angebrachte schlanke Metallkonstruktion zur Erdbebensicherung

Country Status (2)

Country Link
EP (1) EP0172092A1 (de)
FR (1) FR2568235B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0533977A1 (de) * 1991-09-26 1993-03-31 INTERSER GROUP S.r.l. Hochliegende fahrbare Vorrichtung zum Verlegen von Rohren und zum Ausführen von Wartungsarbeiten unter der Decke von Industriegebäuden

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2734028A1 (de) * 1977-07-28 1979-02-15 Noell Gmbh Erdbebensicherung fuer einen laufkran
GB2106854A (en) * 1981-09-29 1983-04-20 Nukem Gmbh An apparatus for lifting up remote handling equipment

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2734028A1 (de) * 1977-07-28 1979-02-15 Noell Gmbh Erdbebensicherung fuer einen laufkran
GB2106854A (en) * 1981-09-29 1983-04-20 Nukem Gmbh An apparatus for lifting up remote handling equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0533977A1 (de) * 1991-09-26 1993-03-31 INTERSER GROUP S.r.l. Hochliegende fahrbare Vorrichtung zum Verlegen von Rohren und zum Ausführen von Wartungsarbeiten unter der Decke von Industriegebäuden

Also Published As

Publication number Publication date
FR2568235A1 (fr) 1986-01-31
FR2568235B1 (fr) 1986-12-26

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19860731

17Q First examination report despatched

Effective date: 19870514

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Effective date: 19871125

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Inventor name: PIRON, GERARD