| 摘要 |
A boiler mounted on a supporting frame structure has gas-tight welded furnace walls suspended at the top of the frame structure and arranged to form a furnace of rectangular cross-section wherein heat is generated when the boiler is operating. A member is connected to the walls and introduces a discontinuity therein. A plurality of horizontal bands surrounding the walls to take up the expansion and contraction forces developed therein because of the heat generated in the furnace and each of the horizontal bands consist of four segments connected one with the other to form a substantially rectangular figure, the segments being rigidly joined at their ends to form the corners of the figure. At least one additional band is disposed in the upper region of the member and a holding means connects the furnace walls to the additional band at the corners thereof so as to cause the walls to take up the portion of the forces acting in the region of the member. A force transfer means is connected between the plurality of bands and the furnace walls for guiding the boiler body in the plurality of bands so as to pretension the walls of the furnace so as to cause the walls to define obtuse angles at the corners of the furnace when there is no heat being developed therein, the angles being selected so as to cause the angles to become right angles as well as to cause the walls to extend parallel to adjacent band segments when the furnace is heated.
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