34results about How to "Adjustable span" patented technology

The invention provides a hydraulic double-type crane which comprises a gantry unit, a skidding unit and dismounting and mounting units, wherein the gantry unit comprises gantry top sections, at least one gantry standard section connected to the lower parts of the gantry top sections as well as gantry bases connected below the gantry standard section; the dismounting and mounting units are connected to the gantry bases and comprise gantry self-dismounting and mounting systems and jacking sleeve frames; and the skidding unit is connected above the gantry top sections and comprises a skidding beam, a skidding bearing beam and a skidding beam skidding mechanism which can drive the skidding beam to skid on the skidding bearing beam. According to the hydraulic double-type crane, no-load and loaded skidding of the skidding beam can be achieved, and the skidding beam span can be adjusted.

The invention discloses a portable luggable computer heat dissipation device which comprises a left base and a right base. A group of damping springs is arranged on the left base and the right base respectively, the upper ends of the damping springs are matched with lifting sleeves, one end of each lifting sleeve is in screwed connection with a lifting bolt, the end of each lifting bolt is rotatably matched with a lifting push block arranged inside the corresponding lifting sleeve, the lifting push blocks are matched with lifting frames arranged inside the lifting sleeves, a group of cooling fans and carriages is arranged on the left base and the right base respectively, the carriage on the left base is connected with the carriage on the right base through a carriage telescoping rod, refrigeration frames penetrate into the carriages, and a group of semiconductor refrigerating sheets are arranged on the refrigeration frames. The portable luggable computer heat dissipation device is stable to place, has the characteristic of stretchable extension, is wide in applicability, can provide good bottom ventilation conditions for a luggable computer, further has a local refrigeration role and has pertinence in heat dissipation.

The invention provides a large-truss-height adjustable suspended splicing combined type frame steel arch frame and an integrated large-span arch ring integral pouring process, the steel arch frame comprises an arch foot section, a standard section, an adjusting section, a closing section and a closing device which are sequentially connected in the arch arc line direction, and a plurality of sections arranged side by side in the arch width direction form an arch rib; the adjacent arch ribs are transversely connected through horizontal connecting pieces and vertical connecting pieces, the upper layer truss, the lower layer truss and the vertical frame are jointly spliced to form the overall stress type arch frame, and the connecting portion of the upper layer truss and the lower layer truss is located at the arc line of the middle of the arch. The process comprises the following steps: loading steel arch frame sections in a stacking manner, transporting the steel arch frame sections to a construction site, constructing arch foot sections, constructing standard sections, adjusting the sections, folding the sections, folding the steel arch frames, supporting an arch mold, and carrying out integral cast-in-place construction. The large-span steel arch has the advantages of being good in overall stability, uniform in stress, high in strength, adjustable in span, adjustable in arc, adjustable in breadth and the like, and the problems of transportation and construction of the large-span steel arch are solved.

The invention provides a hydraulic double-type crane which comprises a gantry unit, a skidding unit and dismounting and mounting units, wherein the gantry unit comprises gantry top sections, at least one gantry standard section connected to the lower parts of the gantry top sections as well as gantry bases connected below the gantry standard section; the dismounting and mounting units are connected to the gantry bases and comprise gantry self-dismounting and mounting systems and jacking sleeve frames; and the skidding unit is connected above the gantry top sections and comprises a skidding beam, a skidding bearing beam and a skidding beam skidding mechanism which can drive the skidding beam to skid on the skidding bearing beam. According to the hydraulic double-type crane, no-load and loaded skidding of the skidding beam can be achieved, and the skidding beam span can be adjusted.

The invention discloses a construction method of a reinforced concrete multi-span arch bridge or a continuous box structure bridge. The method is implemented according to the following steps: step 1) constructing the lower part structure of the arch bridge, wherein the lower part structure comprises a foundation, a middle pier and a bridge abutment; step 2) fixing flexible cables to piers of the arch bridge, fixing ground anchors through the flexible cables, and fixing the ground anchors to a ground to balance the horizontal force borne by the pier; step 3) erecting arch supports on each span of the bridge; step 4) constructing the upper part structure of the arch bridge on the arch supports; and step 5) removing the flexible cables and the arch supports. The construction method is simple in technology, reliable in quality, low in construction cost and rapider in construction speed, and the safety risk is lowered.