74 CHAPTER II, SECTION 3 the pump houses consisted of a reinforced concrete I-beam the height of the second story. The concrete flanges of the I-beam were used to give lateral stability to the 32-foot span and were extended the full length of the building. of supporting the pipes near Station 24 where they converged together. It was decided to use solid steel plate walls with holes for the pipes as bents at locations within 150 feet of Station 24. Close to Station 24 and where the pipes the end walls of the pump houses were extended 2’-6” to form buttresses. Because the building 18’ to 30 long and 13’ high. These bents rested on reinforced concrete foundation walis which extended down to coral. The steel wall bent located 25 feet from Station 24 was a fixed-type support and was required to take the thrust from 125 feet of the pipelines. This was accomplished by bracing back to a steel wall bent 12 feet behind which in tum was secured to the ground. To prevent buckling and movement of this fixed bent, numerous bar stiffeners were welded to the steel plate and placed in such a manner as to miss all the pipes. This resulted in an almost random looking pattern on the bent. In all, there were 7 steel plate bents of which three rested on foundation walls and four on 8 to 9-high steel-framed structures composed of 6-inch pipe columns, 12-inch I-beams, and 3-inch angle braces. The remainder of the To give lateral stability to the entire building, utilized mirrors, settlement was a critical con- sideration. To prevent settlement, the walls of the pump houses, which supported the entire struc- ture, were extended down to the solid coral and supported on mat foundations. The 24-inch diameter vacuum manifold on the second floor was supported on steel beams which spanned between the longitudinal 12-inch I-beams and the concrete [-beams. The 38-pipe array was supported on 17 steel frame bents, most of which were spaced 31 feet at center and laid parallel to the mirror house. The pipes were spaced 7’-9” apart at the mirror house where they were at the same elevation and focused at various points within Station 24, This situation proposed a problem were low, the steel walls were 25/32-inch plate, 17 bents consisted of angle supports for each pipe which rested on steel-framed structures similar to those for the four steel plate walls. Page 2-97