| 摘要 |
Support of development working in which profiled grillage beam is directed with depression downwards and between it and more short standpipe yielding unit is formed, this consists of two metal rods with threading at the ends, those are welded to the end of the beam, that goes to working, besides that there is included shaped slat that presses shortened standpipe to the beam by means of two washers and two nuts that are turned on to threading of the rods. |
