sqxf shell & yoke assembly procedure j.c. perez nicolas bourcey, paolo ferracin, javier parrilla...
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SQXF Shell & Yoke Assembly Procedure
J.C. Perez
Nicolas Bourcey, Paolo Ferracin, Javier Parrilla Leal, Mariusz Juchno
Shells ready to be assembled
July 2014J.C. Perez 3
4 feet assembly base
The shells are instrumented with the strain gauges before starting the assembly sequence
Lower shell positioning
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Longitudinal positioningsupport for the shell
Longitudinal positioning support for a ¼ yoke
The base plate will be levelled and bolted to the floor
Shells preparation
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4 short alignment pins are inserted and glued in the lower inner shell slots of the first shell to be installed on top of the assembly base plate
Shell lifting
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The shells are manipulated using a 4 sling lifting tool and adjustable bolted lifting eyes.
Mounting lower shell
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The lower shell is positioned on top of the assembly base plate
Angular positioning of the shells
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The relative angular alignment between the 2 shells is guaranteed by the use of the 2 long pins
Mounting angular positioning pins
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The 2 long pins are inserted in the correspondent grooves and kept in position by using a dedicated holding tool
Securing shells assembly
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4 aluminum profiles mounted around the shells and clamped with adjustable straps, prevent the upper shell to fall
¼ yoke rotation
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The ¼ yokes are equipped with a dedicated lifting tool and installed on a pivoting table. The yokes will be inserted on the shells in vertical position
First ¼ yoke insertion (2/2)
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The angular alignment of the first ¼ yoke is defined by 1 long middle pin and 2 small pins located at the shell extremities
Joke clamping
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Dedicated clamping tools will be used to radially clamp the ¼ yoke in the shells
Upper radial clamp
Lower radial clamp
Removing central pin holding tool
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The holding tooling of the middle pin is removed before clamping the yoke at its final radial position (required gap between yoke and shell to allow pin removal ± 0.3 mm)
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Second ¼ yoke insertion
The second ¼ yoke is inserted and clamped like the first one
3rd ¼ yoke insertion(1/4)
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Using the same assembly procedure, the 3rd yoke will interfere with the yokes already installed.
3rd ¼ yoke insertion(3/4)
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The Yoke lifting tool is equipped with 2 guiding wheels forcing the yoke against the plastic spacers
2 longitudinal plastic spacers will be used to guarantee a constant gap between yoke and shell preventing interference with the already inserted yokes
3rd ¼ yoke insertion(4/4)
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The yoke is temporally clamped and the 4 (40mm) short alignment pins are inserted
on the grooves before removing the plastic spacers
The yoke is clamped onto its final position and the lifting tool is removed
4th ¼ yoke insertion(4/4
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The last remaining yoke is inserted and clamped using the same method
Mounting center welding blocs
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2 stainless steel blocs for welding key alignment and tack welding will be bolted to the yokes
Yoke pre-loading
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A cross-shape support will be inserted in the structure to support the bladders for shell pre-loading operation
Bladders insertion
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4 bladders of 1549 * 57 mm will be used for pre-loading operation
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