In 1972, after the normalization of diplomatic relations between China and Japan, in order to strengthen the communication links between China and Japan, an agreement on the construction of Sino-Japanese submarine cables was signed in Beijing in May 1973 through the agreement of the two governments. The Sino-Japanese submarine cable runs from Nanhui County, China to Lingbei Town, Kumamoto Prefecture, Japan, with a total length of 872 kilometers and 48 telephone lines.
In p>1976, the cable laying ship was designed by 78 Research Institute and built by China Shipyard. The first 991 cable laying ship "Post and Telecommunications 1" was started in February 1975. The key equipment in the construction is the cable laying machine, which must be able to pay the cable synchronously with the ship speed. The ship adopts a hydraulic follow-up automatic cable laying machine designed by Wei Huren and trial-produced by Wuzhou Machinery Factory. The cable laying system consists of: double drum cable laying machine, tire cable digger, bow hanger, steel wire speed measuring device, buried plow, 25t winch, stern hanger, signal cable winch, etc. The ship was completed in February 1976. Its main dimensions and performance: the total length is 71.m, the profile width is 1.5m, the profile depth is 5.2m, the draft is 4.6m, the full-load displacement is 1,327 tons, the speed is 14 knots, and the total power is 1,641kW (2,2 HP). The steel hull is adopted, with the head protruding, the stem leaning forward, and the approximate square stern. The rudder is balanced by double engines and double flow lines, and the bow is equipped with a side-pushing device and a mooring winch. Bow and stern can lay cables, but bow fishing and stern laying are the main methods. Usually, cables can be laid between islands off the coast of China, and cables on the seabed (shallow sea) can be salvaged and repaired.
from 1979 to 1981, six 991 cable laying vessels were built for the navy to lay, salvage and repair submarine cables between islands off the coast of China. Type 991-Ⅱ cable laying ship won the National Science and Technology Conference Award in 1978. In April, 1973, after the national planning meeting, following the instruction of the State Council Prime Minister Zhou Enlai that "the port must be changed within three years", Shanghai Shipbuilding Company issued a plan to Donghai Shipyard in May of the same year to build a piling boat for port construction. The technical design and construction design of the pile driver shall be undertaken by Shanghai Ship Design Institute.
The shipyard is composed of the fighting command of the piling boat and the youth commando team, and it was officially started in July 1973. Ding Wei served as a builder. In the manufacturing task of six 15-ton piling ships, the key equipment is 13 deck winches (including 2 2-ton winches and 11 5-ton winches) on each ship, and 78 winches of all six ships are manufactured by Donghai Shipyard, among which steel castings are solved by Jiangnan, Hudong and Shanghai shipyards in cooperation. Donghai Shipyard made great efforts to reform the technology and adopted a shaper instead of a large slotting machine to process 78 gears. The whole factory "plays a game of chess" and processes parts of winch. Hull workshop workers also successfully innovated the "movable frame jig", saving 24 tons of jig steel and 68 hours of working hours per ship. In December 1973, two ships were delivered. The first ship was named "Three Hangs Pile 5". In 1974, 4 ships were delivered and 6 ships of the same type were built.
main dimensions and performance of the pile driver: total length of 46m, shape width of 14m, shape depth of 3m and design draft of 1.9m.. The ship is a non-self-propelled dual-purpose ship for piling and pressing piles, and can also be used as a crane. The work area is mainly Huangpu River, and the construction of coastal ports in East China is also taken into account. It can press and hammer long piles with a weight of less than 25 tons and a length of less than 34 meters, and can also be used as cranes with 4 tons and 7 tons. Shanghai Port Authority entrusts Shanghai Ship Design Institute to design a 984 kW (1,32 HP) fire-fighting boat to strengthen the water fire-fighting work. Donghai Shipyard is responsible for construction design and construction. Li Ming is still a builder. In March 1975, construction started.
the ship is equipped with 2 main fire pumps and 1 auxiliary fire pump. The crank-arm hydraulic lifting platform erected on the deck was designed by Shanghai Ship Design Institute with reference to the British fire ladder technology, and was trial-produced by Donghai Shipyard. The hypocycloid oil motor in this device was successfully trial-produced with self-made equipment in the factory, which fully met the design requirements (there are 9 kinds of valves in this device, of which 16 valves were also successfully trial-produced and identified by this factory). The lifting platform has a good function of loading and using.
the first ship was built and delivered in January 1976. By 1979, 1 ships of the same type had been built. For the 1th fire-fighting boat, the shipowner requested to modify both sides of the deck to be double-timbers, so as to be used as a dual-purpose fire-fighting and towing boat for Nanjing Port Authority.
the main dimensions and performance of the fire boat: the length is 37.5m, the width is 8m, the designed draft is 3m, the speed is 13 knots, and the capacity is 28. The ship is a steel, single deck, bulbous bow, single machine and variable pitch single propeller diesel port fire-fighting ship. The main task is to undertake the water fire fighting work in Shanghai Port (Tongsha to Wujing navigation area). Equipped with water, low expansion air foam and "1211" fire extinguishing agent. Equipped with corresponding fire-fighting equipment for boarding and rescue. It is suitable for fire rescue of ships below 25, tons, and provides fire protection for port coastal facilities. The ship was designed by Shanghai Ship Design Institute and constructed by Donghai Shipyard. Gu Renbang is the architect. Construction started in June 1984. During the construction, the lifting capacity of lifting equipment in the factory was limited, and the ship was equipped with central air conditioning, which prolonged the shipbuilding cycle. During the trial, it was found that the hull vibration was too large, and the design was revised and the structure was strengthened by the design institute before the vibration problem was solved. The hull is smooth and the appearance is beautiful. The quality of the whole ship piping system and painting has been improved from lofting, manufacturing, installation and other processes, which has been praised by ship surveyors and shipowners. In June 1985, the ship was completed and delivered. Name of ship: "Shanghai Supervisor 3". Its main dimensions and functions: the total length is 86.63 meters, the width is 13.8 meters, the design draft is 4.4 meters, the speed is 13.95 knots, the crew is 5, and the gross tonnage is 2123.94 tons. Used by Shanghai Port Supervisor. It is mainly used in the anchorage of the Yangtze River Estuary, and serves for the ships entering and leaving Shanghai Port to pick up pilots day and night. Known as the pilot's work and life base.
on October 6th, 1985, at the invitation of Japan Coast Guard, the ship visited Japan. At that time, it was renamed as "Shanghai Supervision Patrol 54" and visited the ports of Tokyo, Kobe and Hiroshima on behalf of the Maritime Supervision Bureau of the Ministry of Communications for 2 days. 8-ton floating dock In October, 195, Shanghai Shipyard designed an 8-ton floating dock with 36 pontoons left over from the United States to repair the dock below the waterline of the Yangtze River ships. Construction started in December and was completed in May, 1951.
The main dimensions of the floating dock are: total length 65.58m, shape width 17.8m, maximum draft above deck 6.1m, maximum heave 6.8m, maximum displacement of about 187 cubic meters at the time of sinking, and lifting force of 8 tons. The dock was the first floating dock built after the liberation of Shanghai. At the end of 1952, the dock was handed over to Hankou Changhang Bureau for use together with ancillary equipment.
12-ton self-propelled floating dock In the mid-196s, the Navy 485 Factory designed and built a 12-ton self-propelled floating dock. In 1967, after completing the technical design and construction design, construction began. On June 27th, 197, the floating dock was successfully launched. The name of the ship is "89". On August 31, 197, the workers in the copper workshop opened the sea valve of "89" floating dock without asking for instructions and taking safety measures, and carried out illegal operations, resulting in a major accident in which the floating dock sank. After the repair, the economic loss was 12, yuan. In October, 197, the wharf test and navigation test of main and auxiliary engines were started, and all technical indexes met the design requirements. In mid-October, 197, the floating dock was tested for ups and downs, and the boat was tested in mid-October, all of which met the design requirements. Its main dimensions and performance: the total length is 41m, the design waterline is 3m, the profile width is 12m, the profile depth is 7.1m, the design draft is 1.41m, the full-load displacement is 518.17 tons, the load capacity is 12 tons, and the main engine adopts 2 3д 12 diesel engines with a speed of 8.5 knots. Act as a floating repair shop at sea in the waters near harbors and islands.
in p>1971, the floating dock was delivered to Fujian base for use. Name it "Haiwu 89". After years of use, the performance is good, which has made contributions to the ship repair of the base.
Changshan Floating Dock In 1976, Shanghai Shipyard designed and built a three-section combined floating dock Changshan with a lifting capacity of 13, tons. The dock has 28 ballast tanks, including central control room, air compressor room, hull, carpentry, electrician, painting, lifting and welding. Zhu Yuanjun presided over the construction and final assembly work, and the employees of the whole factory made concerted efforts to overcome the difficulties of lack of large-scale lifting equipment and narrow space and complete the final assembly work on the Huangpu River. The sub-dock and mother dock of "Changshan" were launched ahead of schedule on March 25th, 1976. Its main dimensions and performance: the total length is 189.5m, the dock wall is 167.5m, the shape width is 38m, the inner clear width is 28.2m, the upper deck is 15.m away from the baseline, the ship lift deck is 4.m away from the baseline, the empty dock draft is 1.3m, the empty dock displacement is 6,678 tons, the working draft is 3.5m, the working displacement is 22,95 tons, and the maximum sinking beam is 12.7m..
it was completed on March 1st, 1977 and handed over to Jiangyin Chengxi Shipyard for use.