| 摘要 |
A prestressed concrete tank includes a pair of generally parallel, laterally spaced, straight concrete wall sections which are preshrunk by the application of compressive forces. Straight wall sections are constructed on top of a footing covered with a plurality of plastic sheets to reduce friction so that limited longitudinal movements of at least portions of each wall section are facilitated during the preshrinking operation. The ends of the tank comprise semicircular walls which are prestressed using wire tendons extending peripherally around the wall and tightened to impose centripetal forces on the wall and thereby place the same into circumferential compression. The walls each comprise a substantially vertical steel shell diaphragm with a layer of cementitious material such as shotcrete on each side thereof. The steel diaphragm comprises a plurality of panels having vertical edges which cooperate to form joints, a shotcrete cover is shot over both faces of the diaphragm, and a sealing material is pumped into the joints after application of the shotcrete to substantially fill voids and other hollow places within the layers of cementitious material.
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