Portal frame

About: Portal frame is a research topic. Over the lifetime, 1778 publications have been published within this topic receiving 7210 citations.

Reliability analysis of frames with geometric non-linearity subject to stochastic ground accelerations

Abstract: The "probability of failure" analysis of elastic- plastic one- degree- of- freedom structures excited by stochastic infrequent dynamic loads is investigated. The structure is assumed to fail when the inelastic displacement overcomes a given permissible limit. The randomness of the structural response to a whole single excitation is analysed making use of simulation methods. The time- history of the inelastic displacement stochastic process is described by a suitable markov process model. This approach is presented and its computational aspects discussed. Finally a numerical example is considered: the reliability of a portal frame subject to deterministic vertical loads in a seismic region is analysed and its sensitivity to changes in the problem parameters is discussed (a).

Compaction device of earth under pipe

Abstract: PROBLEM TO BE SOLVED: To save the labor by efficiently performing a work for compacting back-filled earth after back filling earth to the circumference of an existing pipe in the repair of a pipeline without damaging the pipe surface. SOLUTION: A portal frame 41 is arranged on the tip part of the arm 5a of a hydraulic bacikhoe 5C through a rotating mechanism 40 so as to straddle the existing pipe 1, and vibration compacters 42 and 43 are installed to the lower part of the frame 41. A guide protector 44 is arranged on the inside of the frame 41.

Universal durability testing machine

Abstract: The invention relates to a universal durability testing machine comprising a framework component, four portal frame components and four loading components. Each portal frame component is arranged on the guiding shaft of the framework component in a penetrating way via eight portal frame linear bearing slide blocks and is connected with the framework component. The loading components are respectively installed on the portal frame components. Most durability testing functions for detecting products like furniture are combined together, and the universal durability testing machine has certain adjustability so that durability testing requirements of different specifications of products like furniture can be met. The universal durability testing machine has advantages of high safety, convenient detection and rapidity and can be used for detecting different specifications of furniture.

Portal frame type conveyor

Abstract: The utility model relates to a portal frame type conveyor The conveyor comprises a base, a portal frame, a conveying arm, a hydraulic oil cylinder and a collecting and releasing winch; the portal frame and the conveying arm are installed on the base; the collecting and releasing winch is connected with the conveying arm through a steel wire rope and the portal frame The portal frame type conveyor is characterized in that two ends of the hydraulic oil cylinder are hinged to the base and the portal frame; the portal frame and the base are in hinging connection The portal frame type conveyor has the advantages that the conveying arms can be folded, folding process influences to the ship body balance performance are small, occupied space after the conveyor is folded is small, the discharging hole height can be adjusted randomly according to requirements due to the fact that conveying angles can be adjusted through the winch, the working stability and the safe coefficient are high, replacement of a carrier is easy and the like

Full-face inner sliding rail moving steel mould trolley

Abstract: The invention provides a full-face inner sliding rail moving steel mould trolley, comprising a portal frame supporting structure, a template, a trolley walking device, a trolley template telescopic oil cylinder structure, a bottom template suspension and inner sliding rail moving mechanism and a trolley jacking and translation mechanism, wherein the portal frame supporting structure comprises a portal frame which consists of a stand column, a cross beam, a longitudinal beam and a diagonal bracing, the circumferential side of the portal frame is provided with the template which is supported by the trolley template telescopic oil cylinder structure, the cross beam of the portal frame is provided with a top mould oil cylinder through a top mould rack, the side face of the frame is provided with a suspension template telescopic oil cylinder, the lower part of the portal frame is provided with a lower longitudinal beam for transferring all stress to a bottom beam, and the stress is transferred to a bottom mould finally through the trolley walking device and a rail arranged on the upper plane of the bottom mould. Full face lining of a tunnel can be carried out, and one-time molding can be realized. A steel rail does not need to be paved in the tunnel any longer, forward moving can be realized by means of an inner slippage rail of the trolley, and materials and the operation time are saved.