Pump station structure

Claim 1

A horizontally elongated container for housing sewage treatment equipment for an underground installation, comprising: a. side walls of substantially rectangular shape; b. a substantially horizontal ceiling supported above said side walls, said ceiling having a substantially rectangular center section extending the length of said side walls and a pair of rounded end sections extending longitudinally beyond said side walls; c. a substantially horizontal floor positioned below said side walls, said floor having a substantially rectangular center section extending the length of said side walls and a pair of rounded end sections extending longitudinally beyond said side walls; d. end walls of semi-cylindrical shape secured along their vertical edges to said side walls and along their horizontal edges to the rounded end sections of said ceiling and floor; e. a plurality of rigid-frame beam rings extending around the flat-sided center portion of said container; f. said rigid-frame beam rings include substantially vertical side ring members extending substantially the entire height of each of said side walls, a substantially horizontal floor ring member secured to the lower ends of said side ring members and a substantially horizontal ceiling ring member secured to the upper ends of said side ring members; g. said ceiling ring member and said floor ring member extend respectively beyond the edges of said ceiling and said floor, and said side ring members are secured to the underside of said ceiling ring member and the topside of said floor ring member; and h. corner stiffener members secured between adjacent rigid-frame beam rings along the intersection between said ceiling and said side walls.