A method for precise positioning and implantation of double-walled steel cofferdams for rock-socketed foundations in deep water
A double-walled steel cofferdam, precise positioning technology, applied in infrastructure engineering, construction and other directions, can solve the problems of long consumption cycle, poor practicability of low pile caps, high cost, and achieve high control accuracy, simple structure and convenient operation. Fast and reliable results
Active Publication Date: 2020-04-21
THE SECOND CONSTR OF CTCE GROUP +1
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Problems solved by technology
This method is suitable for high-pile cap foundations. For low-pile cap foundations, the practicability is poor, the cost is too high, and the cycle time is too long, and the steel casing must be higher than the water surface before the cofferdam can be positioned. The verticality of the cylinder cannot be guaranteed by this method
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[0025] The method of precise positioning and implantation of double-walled steel cofferdams for deep-water drilling rock-socketed foundations in this embodiment uses a plane control system, a vertical control system and a measurement system; Precise positioning construction can solve the problem of difficult control of the plane position of the steel cofferdam and the verticality of the steel cofferdam caused by unfavorable conditions such as uneven blasting foundation pit and high water flow velocity under the condition of deep water bare rock. Such as figure 1 , wherein the plane control system includes an anchor ring 8, shore ground anchor 12, concrete anchor 13 in water, steel wire rope 9 and hoist 11; Steel pipe 4; as figure 2 , the measurement system includes a multi-beam depth sounder, a GPS positioning total station and a number of supporting prisms 14, etc.
[0026] The method for precise positioning and implantation of double-walled steel cofferdams for deep-water...
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The invention relates to an accurate positioning landing bed method of a double-wall steel cofferdam by using a deep-water drilling rock-socketed foundation, and belongs to the technical field of bridge construction. The method comprises the following steps of blasting before landing bed, primarily positioning, primary roughly adjusting and positioning, secondary accurate positioning, vertical adjustment system installation, perpendicularity adjustment and the like. According to the method, the accurate positioning landing bed method of the double-wall steel cofferdam by using the deep-water drilling rock-socketed foundation has the advantages of being simple in structure, convenient and fast to operate, high in perpendicularity control precision and capable of being widely applied to theengineering of bridges and the like.
Description
technical field [0001] The invention relates to a method for precisely positioning and implanting a double-wall steel cofferdam of a rock-socketed foundation in deep water, and belongs to the technical field of bridge construction. Background technique [0002] With the rapid development of bridge engineering, the construction of deep-water foundation bridges such as cross-river and sea-crossing bridges has increased year by year. In the middle and upper reaches of the Yangtze River and its tributaries, the riverbed is mostly bare rock without covering layer. The design takes into account the long-term planning needs of the later waterway. Generally, the foundation is designed as a low pile cap, and underwater blasting technology is required to meet the conditions required for foundation construction. Under the geological conditions of deep-water bare rock, the foundation is generally constructed by the double-wall steel cofferdam "first the weir and then the pile" method. T...
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IPC IPC(8): E02D15/08E02D19/04
CPCE02D15/08E02D19/04
Inventor 李勇海伍军项远方章好龙孙小猛胡晓东杨嘉毅方伏浪江胜华曹建宁宋泽安赵勇
Owner THE SECOND CONSTR OF CTCE GROUP