38results about How to "Reduced tightness requirements" patented technology

A sand-filled expansion anchor rod comprises expansion windowing faces and a hollow anchor rod body. The hollow anchor rod body is composed of multiple sections of anchor rod main bodies; each sectionof anchor rod main body is provided with the two corresponding expansion windowing faces, wherein the upper edges of the expansion windowing faces are hinged to the lower edge of the anchor rod mainbody through hinges; a first lug plate is arranged between the expansion windowing faces at the lower edge of the anchor rod main body located at the topmost end; second lug plates are arranged at theupper edge of the anchor rod main body located at the middle section, and another first lug plate is arranged between the expansion windowing faces at the lower edge of the anchor rod main body located at the middle section; another second lug plates are arranged at the upper edge of the anchor rod main body located at the bottom end; the anchor rod main bodies are in hinged connection through the first lug plates and the second lug plates; and an anchor hole plugging piece is further arranged on the outer wall of the hollow anchor rod body, and connecting tubes are arranged on the top face of the anchor hole plugging piece and connected to a hoop on the outer wall of the hollow anchor rod body in a sleeving mode and can rotate around the hoop. By adopting the structure, it is ensured that the anchor rod is closely attached to an anchor hole, and the good support effect can be also achieved even for the anchor hole with a certain curvature.

The invention discloses a pressure-adjustable core bag type air cushion surge chamber. The pressure-adjustable core bag type air cushion surge chamber comprises a surge chamber body of which the lower end is communicated with a pressure water channel. The pressure-adjustable core bag type air cushion surge chamber is characterized in that a core bag made from elastic materials is arranged in the surge chamber body; the core bag is filled with compressed gases; the upper portion of the core bag is attached to the inner cavity wall of the surge chamber body. According to the pressure-adjustable core bag type air cushion surge chamber, the fluctuation of the water level can be rapidly attenuated, and the air pressure in the core bag can be adjusted at the same time, so that the pressure-adjustable core bag type air cushion surge chamber has the advantages of being low in construction cost, good in air-leakage resistance, better in energy dissipation and pressure adjusting effect, convenient to repair and maintain and the like.