Since 2 1 century, the bridge construction in China has developed rapidly, and the field of bridge construction has gradually expanded to the offshore, and the offshore bridge project has grown from scratch. Offshore bridge construction has a large amount of work, involving many construction units. Offshore construction faces many unfavorable factors, such as harsh natural environment, changeable climate, many points and long lines, scattered personnel, more equipment, inconvenient transportation, limited range of personnel activities and so on. Taking the Hangzhou Bay Bridge project as an example, this paper introduces the safety management measures that should be taken to prevent accidents in offshore engineering construction.
Hangzhou Bay Cross-sea Bridge starts from Hejiatou, Haiyan County, on the north side of Hangzhou Bay, passes through Zhengjiadai, about 6 kilometers west of Zhapu Port, crosses the north channel and south channel of Hangzhou Bay, crosses the Shitang seawall on the south bank beach, and reaches the bridge stop via Tang Jiu and Batang. It is the most convenient passage for Tongjiang-Sanya coastal passage to cross Hangzhou Bay.
Measures to reduce marine risks
Hangzhou Bay Bridge is located in the middle of Hangzhou Bay, and there are many kinds of disastrous weather, including typhoon, tornado, fog and thunderstorm. The hydrological conditions that affect the construction mainly include tides, wind waves and scouring. In order to increase the effective working hours and minimize the risk of offshore construction, the construction unit should take the following measures to ensure normal construction in view of the above unfavorable conditions.
1, typhoon prevention measures
Zhejiang is a place where typhoons occur frequently every year. In order to ensure the safety of national property and employees' lives, the construction department has formulated a special plan and unified the guiding ideology and organization: all employees unite as one to ensure the safety of property and employees' lives in the bridge construction of the project department; The project department set up a typhoon prevention leading group, which is responsible for typhoon prevention every year.
After the typhoon warning is issued and before the typhoon arrives, the construction party shall take the following measures to prevent the losses caused by the typhoon:
(1) Listen to the weather forecast, contact the local typhoon prevention department and meteorological department, and keep abreast of the typhoon dynamic information.
(2) The temporary houses for production, living and office are reinforced respectively.
(3) The production ship was towed to a safe port to avoid the typhoon.
(4) When mechanical equipment is transferred to a safe area, if it is really necessary to leave, protective measures must be taken at the scene to ensure its safety.
(5) Transfer the materials to a safe area, and protect those that cannot be transferred in situ to ensure that they are not damaged.
(6) The employees and personnel of the cooperative units should be transferred to safety in a planned way.
(7) After employees leave the construction site, assign the personnel on duty to the production, living and office sites, and equip them with communication equipment such as walkie-talkies to ensure that all kinds of property of the project department are not lost or damaged.
(8) After the typhoon warning is lifted, the project department will restore the normal construction and production order as soon as possible.
(9) The hoisting construction principle of pile foundation, pile cap and steel box girder should try to avoid typhoon period (July, August and September). In order to adapt to and overcome the harsh current and wind and wave conditions in Hangzhou Bay, the construction unit has reformed and increased the number, tonnage, anchor cables, anchorages and windlasses of construction ships on the water.
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