A method of creating ice crossing
(57) Abstract:The invention relates to the field of hladotehnika and can be used when creating the ice terminal for cargo transportation. The invention is aimed at improving the bearing capacity of ice crossings when the presence of intense ice flow. This technical result is achieved by increasing the thickness of the ice. For this purpose under the ice cover through a through slot prepared in the past and oriented perpendicular to the direction of ice flow, inclined install the plate with the upper edge of the flange for fixing it on the ice surface by vmerzanii it in the ice cover. 1 Il. The invention relates to the field of hladotehnika and can be used when creating the ice terminal for cargo transportation.Known technical solution (1. I. S. Peschansky. Lagoudera and hladotehnika. - L.: Sea transport 1963 S. 345), in which a method of creating ice crossing is in the preparation of the ice cover by the early clearing of the ice surface from snow along the intended path for faster growth of ice thickness.The disadvantage spov channels with strong currents, the intensity of the ice buildup is reduced, and in some cases freeze-up is not observed even in extreme cold (for example, on mountain rivers).The task of the invention is to provide a reliable ice crossings when the presence of intense ice flow.Technical result achieved when the task is to increase the thickness of the ice.The essential features that characterize the invention.Restrictive: ice crossing is generated by the Stripping of the ice cover from snow.Distinctive: under the ice cover through a through slot formed in the latter and oriented perpendicular to the direction of ice flow, inclined install the plate with the upper edge of the flange for fixing it on the ice surface by vmerzanii in ice.It is known (2. Altshul A. D. Hydraulic resistance. M.: stroiizdat, 1973) that in the presence of fluid flow of the hydraulic resistance in the form of a valve or vertical plate, oriented across the flow for prolonged stagnant zone, where there is a decline in the power and speed of the fluid. If the plate is tilted, the width sepolta this hydraulic property of the fluid flow, by effectively freezes the water under the ice cover in the place of the scheduled ice crossing to create favorable conditions for intensive growth of ice thickness.The method is as follows.In ice cover along the intended path of the ice crossing across the speed of ice flow is purchasing through slot along the entire length of the crossing. Then through it under the ice inclined lower plate. After vmerzanii top edge of the plate in ice ice crossing is exposed to low temperatures for a time sufficient to freeze under the plate of the required thickness of ice.The invention is illustrated graphically, where the drawing shows a diagram of the installation plate.In ice cover 1 along the intended direction of transport of goods U perpendicular to the direction of the velocity vector ice flow prepare inclined through slot 2 along the entire length of the ice crossing. Then through the slot 2 under the ice tilted at an angle ( < 90o) lower plate 3 height (H > h, which is to facilitate its fastening on ice has on the upper edge of the flange 4. After vmerzanii plate in the ice, i.e. the freezing air temperatures (t < 0oC) within the time required for freezing under the plate of the ice layer 5 with a thickness sufficient for reliable transportation of goods in an ice crossing. The way to create icy crossing, consisting of scraping ice from snow, characterized in that beneath the ice cover through a through slot formed in the latter and oriented perpendicular to the direction of ice flow, inclined install the plate with the upper edge of the flange for fixing it on the ice surface by vmerzanii in ice cover.
SUBSTANCE: invention can be used in designing ramp and propulsion and steering gear and their hydraulic systems. Novelty in proposed water craft is that it is furnished with streamlined carrying frame for fastening devices of propulsion and steering complex installed in hull aft part and formed by two pairs of rigid longitudinal beams hinge secured by inner ends of aft sheet of hull in zone located under loading side coupled by flexible cross beams in each pair and support bar between pairs. Hydraulic heads of propulsors are hinge-mounted on outer ends of each pair of longitudinal beams, being secured on said beams to form additional cross tie between beams. Carrying frame is furnished with power hydraulic cylinders connected with hydraulic system and installed to control position of heads and loading side by turning carrying frame in aft sheet hinge joints. Body of each is provided with upper roller support, being rolling support for each hinged loading side at its opening, and lower platform being rigid base interacting with ground at resting of hinged loading side on head body in loading position of loading side. Novelty in hydraulic system of watercraft is that it is furnished, in additional to propulsor control hydraulic cylinders, with hydraulic cylinders for setting ramps, changing thrust vector, fixing loading side and locking carrying frame. Each hydraulic cylinder, including propulsor position control hydraulic cylinders, are supplied through parallel hydraulic lines connected with main line, with electric control in each line. Invention contains description of design peculiarities of each line providing required modes of operation of watercraft.
EFFECT: improved performance of watercraft and creating of hydraulic system providing required mode of operation of watercraft.
9 cl, 11 dwg
FIELD: building, particularly to construct temporary roads across lakes and other water obstacles.
SUBSTANCE: ice bridge includes cooling plant, pipelines connected to cooling plant. Pipelines are submersed in water and suspended by wire ropes. Cooling plant has reducers for pressure reduction, 10 MPa gaseous nitrogen cylinders and liquid nitrogen cylinders adapted to fill pipelines with liquid and gaseous nitrogen mixture. The pipelines include several coiled sections or formed as straight and finned pipes. The pipelines are arranged in several rows and extend in vertical or horizontal directions. The pipelines are submersed for 0.1-5 m depth and are connected by wire ropes to balloons floating at water surface or to finned pipes driven in ground of river bottom and connected one to another by diaphragms. The cooling plant provides water freezing within 3-5 km range and obtains ice having thickness of 3 m or more.
EFFECT: increased water freezing rate.
FIELD: movable or portable bridges, floating bridges adapted to convey loads over ice cover.
SUBSTANCE: method to transport vehicle having weight exceeding load-carrying ability of ice cover over ice involves moving vehicle having weight not exceeding load-carrying ability of ice cover at resonance speed; moving vehicle having weight exceeding load-carrying capacity to ice cover line when above vehicle having lesser weight has moved away from ice cover line for distance equal to 2/3 of resonance bending-gravity wave length; initiating above vehicle having larger weight movement with above resonance speed. Resonance bending-gravity wave length is determined from where D is cylindrical stiffness of ice plate, ρ and h - ice density and thickness, g - gravity, H - water body depth.
EFFECT: increased load-bearing capacity of ice cover.
FIELD: floating bridges, for instance temporary bridges for load transportation over ice.
SUBSTANCE: structure includes ice blanket in which vertical holes are drilled for the full bridge structure length so that the holes are located from both bridge sides. Reinforced concrete blocks connected to ropes are inserted through the holes so that the blocks are located under the ice blanket. Discs having diameters exceeding hole diameters are connected to upper block ends. Rope lengths are selected to prevent ice blanket movement in upward direction with respect to initial ice position if flexural-gravity waves are generated in ice blanket.
EFFECT: increased load-bearing capacity.
FIELD: bridge crossing equipment; ferries and floating bridges.
SUBSTANCE: proposed motor unit includes displacement hull with joints in sides, engine mounted inside hull and water-jet propeller, two hinged pontoons which are articulated with hull and mechanism for opening and folding the pontoons. Each hinged pontoon is provided with torsion-loaded swivel hydrostatic shield on external side which is articulated with hinged pontoon in area of its bottom; hinged pontoons are also provided with mechanism for turning the shield; this mechanism is made in form of hydraulic cylinder with rod secured in hull of hinged pontoon. Thrust roller secured on end of rod is received by guide of hydrostatic shield.
EFFECT: reduced resistance of shuttle ferry due to improved streamlining of projecting lower part of motor unit.
FIELD: bridge construction, particularly floating bridges, for example, pontoon bridges.
SUBSTANCE: method involves unloading land-based and river-based pontoon sections on ice, expanding the pontoon sections in temporary bridge location area; sealing pontoons of each pontoon section by means of top and bottom jointing means; moving each pontoon section to temporary bridge construction site over ice; serially jointing pontoon sections with each other along temporary bridge length and breaking ice by blasting charges spaced from bridge axis. Longitudinal grooves are created in ice from each bridge side with the use of ice-cutters so that ice thickness in groove bottom area is not more than 10 cm. After that elongated charges including several detonating fuse strings are laid in the grooves. The grooves are filled with wet snow or water and elongated charges are blasted to break ice in each groove. After that ice under bridge sections is broken by vehicle movement over the bridge.
EFFECT: decreased time and increased safety of temporary bridge construction.
FIELD: construction industry; bridges.
SUBSTANCE: method of pontoon bridge equipping at high flow speed is performed using set of railway pontoon ribbon bridge and differs in the fat that bridge stiffness on water obstacle is provided by anchors which are installed on bridge top and bottom sides and are attached to bottom of outer pontoons with the help of ropes which pass through lugs fixed on rings welded to deck and bottom of outer pontoons.
EFFECT: increasing vertical component of hydrodynamic forces, reducing the different of member to top or bottom sides, and improving pontoon bridge reliability.
FIELD: construction industry.
SUBSTANCE: ice crossing construction method refers to ice-technology industry, and can be used when designing ice crossing meant for load transportation. Snow shall be removed from ice surface, and the latter shall be covered with air-tight film. Space between ice surface and film is ventilated with fan cold ambient air. Cold air flow intensifies heat exchange on ice surface and provides its fast cooling, and thickness increase.
EFFECT: fast putting into operation of ice crossing.
FIELD: construction, road construction.
SUBSTANCE: invention is related to the field of bridge engineering and is intended for erection of pontoon bridges over water obstacles on a tight schedule and with the least material and labour expenses. It is achieved by the fact that pontoon bridge comprises pontoons open at the bottom, on which bridge supports are mounted to carry spans and road way, and spacers that connect peripheral parts of pontoon to fixed anchors on soil, and every pontoon is arranged in the form of packet of vertically oriented adjacent tanks that are inverted upwards with their bottoms and are connected to system of air supply and its pressure control in every of them, at that spacers are located on the opposite sides of pontoon to form triangular figures with every of them, which are oriented in crossing planes, and have dampers and/or control mechanisms, preferably with remote control, their stretching in process of bridge erection and/or its operation. At that vertically oriented tanks form rows of cells in section with horizontal plane, which are evenly located on at least part of section area.
EFFECT: higher reliability of pontoon bridge operation at different dynamic effect at it, also from wave and wind loads due to provision of stability in pontoons that carry spans and provision of their controlled submersion at specified depth.
4 cl, 2 dwg