Auxiliary positioning method for U-shaped platform of large cofferdam

Abstract

The invention discloses an auxiliary positioning method for a U-shaped platform of a large cofferdam. The auxiliary positioning method is characterized in that a main trestle is built from the shore, auxiliary trestles extending from the main trestle are built from the two sides of a main pier, and the U-shaped platform is formed by the two auxiliary trestles and the portion, between the two auxiliary trestles, of the main trestle; the cofferdam is transported to the tail portions of the auxiliary trestles, close to the middle of a river, of the U-shaped platform and connected with the auxiliary trestles, and mooring and positioning are conducted; the front end of the cofferdam is pulled into the U-shaped platform through a plurality of pulling cables which are connected to the U-shaped platform and provided with traction equipment; and the positions of the front end and the two sides of the cofferdam in the U-shaped platform are adjusted through the multiple pulling cables which are connected to the U-shaped platform and provided with the traction equipment, and finally the pulling cables are pre-tightened for positioning. According to the auxiliary positioning method, the U-shaped platform is formed by the main trestle and the auxiliary trestles, accurate positioning of the cofferdam is achieved rapidly, and the influences to the watercourse are small.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to an auxiliary positioning method for a U-shaped platform of a large double-wall steel cofferdam. Background technique [0002] The double-wall steel cofferdam is the water-stop structure of the platform cap construction and the support structure of the drilling platform. There are two common positioning methods: 1. Positioning ship positioning: The advantages of the positioning ship positioning scheme are that the construction experience is mature, the construction difficulty is small, and the construction speed Fast; the disadvantage is that there are a large number of ships and anchor cables, which have a great impact on the channel, and the positioning system is a flexible system. The ship is disturbed by the fluctuation of the water level, and the positioning accuracy is low. It is suitable for the positioning construction of double-wall steel cofferdams with small...

AI Technical Summary

Problems solved by technology

2. Anchor pier positioning: The advantage of the anchor pier positioning scheme is that the construction force is clear, the number of anchor cables is small, and the construction process is not affected by the water level; the disadvantage is that the cost of anchor pier construction is increased, and the river channel is also occupied, and the construction speed slower

The Chinese invention patent with the publication number CN 101666097 discloses a large-scale steel suspension box or caisson positioning and sinking method, which is the anchor pier positioning method, which requires the construction of upstream anchor piers and downstream anchor piers, which is costly and takes a long time

Images