PURPOSE:To prevent the slackening of saddle-shaped riders and to permit easy centering by fitting the projecting parts at the rear ends of the saddle-shaped riders to the recesses at the front ends of the saddle-shaped riders and pressing the central ribs of the saddle-shaped riders to the peripheral surfaces of mounting saddles. CONSTITUTION:The rear metallic mounting fixtures having the front recesses to be fitted to the rear projecting parts 10 of the saddle-shaped riders 3 are fixed onto plural rows of water cooling pipes 1 and the plural mounting saddles 2 are welded at prescribed intervals onto the pipes 1. The saddle-shaped riders 1 are then lowered from above in such a manner that the central ribs 7 and inside projecting parts 14 thereof are held in the positions of alternate long and two shart dashes lines, thereby retracting the entire part of the riders toward the down stream side. The projecting parts 14 are thereby brought tothe positions of solid lines and are fitted into the front recesses 15 formed to the front projecting parts 5 of the saddles 2; at the same time, the central ribs 7 are also moved to the solid line positions where the ribs are fixed. The riders 3 are successively assembled from the upper stream side in the above- mentioned manner until finally the rear projecting parts are fitted into the from trecesses 11 of the riders 3. The assembly is thus completed.
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