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美国密西西比河上一座辅助分水闸于1982年开工兴建,至1985年共浇筑了85％混凝土。该分水闸工程共有六个泄水表孔,孔口净宽19.9米,装设六扇弧形闸门调节水量。弧门支铰支承于混凝土支座大梁上,支座梁以后张法预应力锚束锚固于闸墩内。为了承受河水作用于闸门上的巨大冰平推力,需对闸墩和支座梁施加以巨大的后张力,预应力锚束系按照美国材料试验标准ASTM A722采用高强螺纹钢束,极限抗拉强度为160ksi(112.5kg/mm~2),每扇闸门的一侧支铰梁锚固于半个闸墩中,相应设置84根锚束,每根直径为35毫米,支座大梁沿其轴线采用78根后张预应力锚束。
An auxiliary sub-catchment on the Mississippi River was started construction in 1982 and a total of 85% concrete was poured by 1985. The sub-sluice project has a total of six drainage holes, the hole width of 19.9 meters wide, equipped with six arc-shaped gate to regulate the water. The arc door hinge is supported on the concrete support girder, and the anchor girder is anchored in the pier after the prestress anchorage beam of the Zhang method. In order to withstand the tremendous riparian thrust of river water acting on the gate, it is necessary to exert a great back tension on the pier and the support beam. The prestressed anchor beam system adopts the high-strength threaded steel beam according to the American material test standard ASTM A722, and the ultimate tensile strength Is 160ksi (112.5kg / mm ~ 2). One branch of each gate is anchored in one half of the pier, corresponding to 84 anchor bundles each with a diameter of 35mm. The support beam adopts 78 Root post-tensioned prestressed anchorage.