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    • 59. 发明申请
    • Work method for filling grout into inner cable of post tension system pc structure
    • 填充灌浆到后张力系统pc内部电缆的工作方法
    • US20050108981A1
    • 2005-05-26
    • US10510029
    • 2003-05-30
    • Tsutomu KadotaniHidetoshi MiyauchiHiroshi MugurumaYusuke KumamotoShin NaruiYoshitaka NishidaMotoo Shimizu
    • Tsutomu KadotaniHidetoshi MiyauchiHiroshi MugurumaYusuke KumamotoShin NaruiYoshitaka NishidaMotoo Shimizu
    • E01D1/00E01D2/00E01D19/16E01D101/24E01D101/40E04C5/10E04G21/12E04B1/00
    • E04C5/10E01D19/16
    • In the present invention, testing is performed by injecting grout (G) into a full-scale specimen comprising a cable that is fabricated at a place other than a construction site. The cable has a sheath made of a transparent material and has the same three-dimensional configuration as that of an internal cable (2°) at the construction site. Alternatively, grout (G) is injected into a partial specimen comprising a lengthwise part of the cable where an air trap is likely to occur. The testing is performed under a plurality of different testing conditions. The best grouting conditions are selected from testing results and applied to grouting actually carried out at the construction site. With the conventional method of grouting an internal cable of a post-tensioned prestressed-concrete structure, it is difficult to check at the construction site whether or not the internal cable is filled with grout without an air trap remaining therein because the cable is laid in concrete and hence the sheath (3′) is hidden by the concrete. It is possible according to the present invention to provide a post-tensioned prestressed-concrete structure free from an air trap (V) in the sheath and hence free from the danger of corrosion or breaking of prestressing steel used in the cable.
    • 在本发明中,通过将灌浆(G)注入到包括在施工现场以外的地方制造的电缆的全尺寸试样来进行试验。 电缆具有由透明材料制成的护套,并且具有与施工现场的内部电缆(2°)相同的三维构造。 或者,将浆料(G)注入包括可能发生空气阱的电缆的纵向部分的部分样品。 测试在多个不同的测试条件下进行。 最佳灌浆条件选自试验结果,适用于施工现场实际进行的灌浆。 采用传统的注浆后预应力混凝土结构内部电缆的方法,难以在施工现场检查内部电缆是否填充有水泥浆,而不会留下空气阱,因为电缆铺设在 混凝土,因此护套(3')被混凝土隐藏。 根据本发明,可以提供一种在护套中没有空气阱(V)的后张紧的预应力混凝土结构,因此没有在电缆中使用的预应力钢的腐蚀或断裂的危险。
    • 60. 发明授权
    • Work platform for use on bridges
    • US6138793A
    • 2000-10-31
    • US888271
    • 1997-07-03
    • Lambros Apostolopoulos
    • Lambros Apostolopoulos
    • E01D2/00E01D19/10E04G3/00E04G3/14
    • E01D19/106
    • A work platform for use on bridges wherein a plurality of cables extend along a section of the bridge in spaced relation below the deck or roadway and steel support structure of the bridge, which cables are supported at opposite ends by either the steel support structure of the bridge or by the spaced-apart vertical piers of the bridge, and wherein a plurality of platform flooring panels or sections are supported on the cables, extend laterally of the cables, are arranged side-by-side along the section of the bridge such as between the piers and are removably secured to the cables. In one aspect the cables are connected at each end exclusively to the bridge piers, and in another aspect the cables are connected at each end exclusively to the bridge steel structure. In the latter instance, there is provided the capability of installation on skewed or angled bridge sections. In both aspects there is capability of adjustment in vertical and horizontal directions. The platform flooring sections comprise elongated rectangular corrugated decking panels and are arranged in end-to-end overlapping relation transversely of the cables, side-to-side overlapping relation along the bridge and with the corrugations extending transversely of the cables. The corrugations maximize the strength-to-weight ratio of the platform flooring and provide recesses or receptacles to contain debris and facilitate its collection and removal. Each of the platform flooring sections is releasably connected at spaced locations to the supporting cables on which it rests. This is provided by connector assemblies comprising a first part which engages the upper surface of the flooring section and the cable and a second part which engages the upper surface of the flooring section, the two parts being removably connected together through a small opening in the flooring. As a result, individual flooring sections can be removed to provide access through the flooring in emergency or critical situations while at the same time allowing the remainder of the flooring to retain collected debris. A connector assembly also is provided which has a manually operated lever for selectively placing the connector assembly in clamped or un-clamped positions relative to the cable and flooring section. The corrugated decking panels can be provided with hinged plates for covering the corrugations to provide a substantially flat surface over the panels.