51results about How to "Won't pull out" patented technology

The invention relates to a pile top crown beam structure of a high-strength prestress pipe pile for supporting a foundation pit and a construction method thereof. The structure is characterized in that a crown beam is arranged at the tops of high-strength prestress pipe piles, the length of the part, inserted into the crown beam, of each high-strength prestress pipe pile is the same as the height of the crown beam, the height of the crown beam is not lower than 500mm, the width of the crown beam is 400mm more than the diameter of each pipe pile, the two ends of the crown beam respectively extend by 200mm out of the edge of each pipe pile, longitudinal stress reinforced bars of the crown beam are arranged near the edges of the inner side and outer side of the foundation pit, web bars are attached with the edge of each pipe pile, a bidirectional two-leg hoop bar and two additional vertical pull bars are arranged between the crown beams of the two adjacent high-strength prestress pipe piles, the hoop bar is 50mm away from the edge of each pipe pile, and two independent bidirectional two-leg bars are arranged in the area, anchored into the crown beam, of each high-strength prestress pipe pile. The method comprises the following steps of excavating earth to the bottom of the cushion layer of the crown beam, measuring and paying off, casting the cushion layer, binding the reinforced bars, supporting a formwork, casting concrete, airing water and curing, removing the formwork, and excavating the earth of the lower layer.

A crashproof guard bar includes a guard bar base (1), a column (2), a bridging beam (3) and an energy-absorbing screw thread member (4). The guard bar base (1) is F type and is set across the road bed. The rear segment of the basic bridging beam (11) on the guard bar base (1) is disposed with a guide groove (12). A hole (13) is disposed in the basic bridging beam (11) at the front end of the guiding groove (12) along longitudinal direction, and is disposed with the energy-absorbing screw thread member (4). The column (2) is disposed in the guide groove (12) and is connected to the energy-absorbing screw thread member (4). The bridging beam (3) is disposed in front of the column (2) and is connected with the column (2). The invention has firm base, will not occupy effective running road surface, can generate buffer energy-absorbing function when the vehicle crashes the guard bar, and can crash intensity and has good guide ability, and can farthest reduce the damage to the vehicle and passenger from the crash. The invention is especially adapted for the pavement anti-collision guard bar on cliff and bridge anti-collision guard bar.