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2116 results about "Trackway" patented technology

Track center line automatic detection method based on vehicle-mounted mobile laser point cloud

The invention discloses a track center line automatic detection method based on vehicle-mounted mobile laser point cloud. The method comprises the following steps: S1, point cloud segmentation of a roadbed and a track; s2, track point cloud classification; s3, automatic track center line detection: according to a cross section design drawing of a standard steel rail, automatically reconstructing astandard three-dimensional geometric model of the steel rail in a segmented manner, carrying out iterative registration on the standard steel rail model and the segmented steel rail point cloud in the S2, and carrying out automatic reconstruction on a segmented three-dimensional model of the steel rail; calculating track geometric parameters by utilizing the reconstructed track three-dimensionalgeometric model, calculating track center line point locations in a segmented manner on the basis of the reference track, and sequentially connecting the track center line point locations extracted inthe segmented manner to form a line center line. According to the method, roadbed and rail point clouds can be rapidly segmented, the area of rail point cloud classification search is reduced, automatic classification of laser point clouds on the surfaces of left and right steel rails is realized, and the precision requirement of existing rail transit midline detection can be met.
Owner:CHINA RAILWAY DESIGN GRP CO LTD

Underground excavation construction deformation control method for three-hole small clear distance tunnel underpass trunk railway

The invention discloses an underground excavation construction deformation control method for a three-hole small clear distance tunnel underpass trunk railway, and belongs to the technical field of tunnel (hole) shallow buried soil stratum construction. Firstly, construction surface subsidence control standards are determined according to the requirement of an existing trunk railway for track smoothness; secondly, construction schemes and construction parameters of the three-hole tunnel are tested and determined by the aid of three-dimensional finite element static and dynamic numerical values. Construction includes the steps: reinforcing lines; grouting and reinforcing the earth surface; constructing an advanced tube screen; constructing a tunnel portal; constructing a tunnel crevasse; grouting and reinforcing side walls and tunnel faces; excavating the tunnel; supporting the tunnel; forming a secondary liner of the tunnel; recovering the lines, and monitoring measurement is performed in the whole construction process. Construction quality is strictly controlled according to a predetermined scheme and process in the construction process, the construction parameters are timely fed back and adjusted by the aid of an information construction technology, and operation safety of existing lines and structural stability of the tunnel are guaranteed.
Owner:中铁六局集团石家庄铁路建设有限公司 +1

Airship shaped space craft

The present airship-shaped space craft has a middle fuselage extending in a fore-and-aft direction, and a pair of two outer fuselages extending in the fore-and-aft direction located symmetrically on both sides of the middle fuselage. In the above fuselages, gas of a specific gravity of which is smaller than that of air is filled, and the middle fuselage is connected with the outer fuselages by a horizontal wing. The horizontal wing is provided with propelling devices supported in a gimbal fashion for generating thrust in any optional direction, jet engines with backwards directed nozzles to be controlled within a range from a slantwise upward direction to a slantwise downward direction, and rocket engines with ejection nozzles to be controlled in right-and-left and up-and-down directions. During ascent of the space craft, at first the propelling devices, then the jet engines and at last the rocket engines are actuated so as to make the space craft reach and fly along a satellite orbit. Upon return of the space craft, the rocket engines, the jet engines and the propelling devices are actuated in reverse order, and aerodynamic heating at reentry into the atmospheric space can be reduced by making the space craft descend slowly. Also, control of the flight in the atmospheric space becomes easy, so that the space craft can safely and easily land on a predetermined narrow area of the ground.
Owner:BUNDO MUTSURO

Variable cross-section cantilever bridge box girder self-locking synchronization pushing system and construction method

ActiveCN103541308AShorten the lengthGuaranteed lateral stabilityBridge erection/assemblyBridge typeTrackway
The invention relates to a variable cross-section cantilever bridge box girder self-locking synchronization pushing system and a construction method. The variable cross-section cantilever bridge box girder self-locking synchronization pushing system comprises a pushing sliding bridge box girder welding assembling platform system, sliding tracks, a group of sliding shoes and a group of self-locking synchronization pushing devices, wherein the group of sliding shoes and the group of self-locking synchronization pushing devices are installed on the sliding tracks, and pushing is automatically controlled. The variable cross-section cantilever bridge box girder self-locking synchronization pushing system is characterized in that every self-locking synchronization pushing device comprises a hydraulic pushing oil cylinder and a self-locking pushing rail clamping device, adjusting pad blocks for adjusting bridge type camber are arranged on the upper portions of the sliding shoes, and thrust plates and side limiting plates, which are used for preventing the sliding shoes from jumping during pushing, are respectively arranged in front of and on the sides of the sliding shoes. Track limiting plates for limiting sliding shoe offset are arranged on two sides of the parts on the lower portions of the sliding shoes contacted with the tracks, a bridge box girder is placed on the upper portions of the sliding shoes, and a bridge box girder transition section and a guide beam are arranged at the front end of the first section of bridge box girder. By adopting the variable cross-section cantilever bridge box girder self-locking synchronization pushing system construction method, the problem of difficulty in bridge erection in complex environments of crossing railways and the like is effectively solved, and the variable cross-section cantilever bridge box girder self-locking synchronization pushing system is safe, reliable and high in efficiency.
Owner:EAST STEEL STRUCTURE BRIDGE
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