70 results about "Cross sea" patented technology

The invention belongs to the technical field of structural engineering, and particularly relates to a cross-sea bridge wind barrier designing method. A bridge floor wind speed field model with a wind barrier and a bridge floor wind speed field model without the wind barrier are established respectively by combining wind tunnel tests and numerical wind tunnels, the simulated height and simulated ventilation ratio of the wind barrier in the bridge floor wind speed field models are changed constantly, the bridge floor equivalent wind speed and the wind speed reduction factor are calculated and compared with the traffic safety wind speed of typical vehicle types, and the height and the ventilation ratio of the wind barrier in safety are the height and the ventilation ratio of the wind barrier needing to be designed. According to the cross-sea bridge wind barrier designing method, when the wind barrier of a cross-sea bridge is designed, conventional factors are taken into consideration, and the influences of multiple wind directions and the influences of multiple bridge types are also proposed to be taken into consideration. Meanwhile, the measure of combining the wind tunnel tests and the numerical wind tunnels is adopted to determine the wind speed fields and obtain the height and the ventilation ratio of the wind barrier, the wind barrier is then designed, and thus the designed wind barrier is more reasonable, more economical, and capable of practically meeting the engineering requirements and powerfully ensuring traffic safety.

The invention provides an incremental launching semi-submersible cross-sea landing floating bridge, belonging to the field of ship marine engineering technique. The floating bridge is assembled by a pushed floating box, a basis floating box and a beachhead floating box which are connected with a tugboat by the buckling between handle retaining blocks and handles. The floating boxes are connected with each other by an underwater transverse joint part and an underwater longitudinal joint part. The floating box is internally provided with inflatable chambers and fixed air chambers. The top end of the inflatable chamber is provided with an electric-controlled deflation valve and an inflation valve is arranged below the left inclined part. The tugboat is provided with a compressor and an electric control unit. When the compressor is started, the inflation valve can be used to inflate the inflation chamber, thus leading the floating bridge to float upwards and facilitating the landing transport. The electric control unit emits the signal and opens the electric-controlled deflation valve so as to lead the inflatable chamber to deflate and the floating bridge to be submerged. The floating bridge has the flexibility of changeable length and width and the concealment of hiding under the water; the floating bridge can move and migrate freely in the horizontal direction and can select the landing point at any points, have wide application range, low manufacturing cost, low cost and quick and convenient assembly.

The invention discloses a method for calculating gravitational potential difference between sea-crossing elevation points, which is used for determining the elevation of islands (reefs) around the land in coastal countries. The method comprises the steps of carrying out astronomical geodetic plumb deviation, gravity and GNSS geodetic height measurement on elevation points on two sides of land and an island; measuring measuring point gravity data and GNSS sea surface height between land and sea in a shipborne gravity / GNSS measuring line mode, and reducing corrected gravity / geodetic height data to an average sea surface; deducing a calculation formula of a gravity potential difference between sea-crossing elevation points according to a gravity potential theory and an astronomical level principle; in combination with astronomical earth vertical line deviations on elevation points on the two sides of land and sea, improving the vertical line deviation precision of measuring lines and measuring points according to a removal-recovery technology; and substituting the result into a deduced gravitational potential difference calculation formula to realize sea-crossing gravitational potential difference calculation. The gravitational potential difference between sea-crossing elevation points is calculated by utilizing actually measured elevation point data of a certain place in Shandong Province, the distance of the elevation points is about 10.5 km, and an elevation value calculated according to the gravitational potential difference meets the level measurement accuracy requirement of the national level measurement specification III.

The invention discloses a construction method of an omega-shaped cross-sea temporary steel trestle. The construction method comprises the steps that 1, a bridge abutment and a steel approach bridge are constructed; 2, two connecting bridge sections are constructed; 3, two transition bridge sections are constructed; and 4, a main bridge section is constructed. The omega-shaped cross-sea temporary steel trestle is erected in a sea-crossing mode under the condition that the geographical positions of an existing wharf, a first dam and a second dam are combined, a steel trestle body and a channel type supporting trestle can jointly provide a safe and reliable construction platform for construction of a bridge to be built, and the construction method of the temporary steel trestle is simple and convenient to construct. The problem that a temporary steel trestle in a super-large-span sea area is difficult to construct is solved, and the construction period can be shortened.