SQXF Shell & Yoke Assembly Procedure

J.C. Perez

Nicolas Bourcey, Paolo Ferracin, Javier Parrilla Leal, Mariusz Juchno

Shells ready to be assembled

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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

Longitudinal offset yoke/shell

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1 mm gap for offset between ¼ yoke and shell

Mounting upper shell

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The upper shell is positioned on top of the lower shell

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 (1/2)

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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)

Lifting tool removal

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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(2/4)

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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

Bladders support structure for shell loading

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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

Yoke keys insertion

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Pre-loading tool removal

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Yoke loading sequence

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Lifting Yoke and Shell

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Yoke and Shell rotation

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And now real pieces !!!

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And now real pieces !!!

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