Method for stopping horizontal oscillation in large-scale steel open caisson construction

Abstract

The invention relates to the technical field of bridge construction and discloses a method for stopping horizontal oscillation in a large-scale steel open caisson construction. The method comprises the following steps: adding a new oscillation stopping locating boat (8), a new locating boat main anchor (9) and a new pull cable (10); when a steel open caisson (1) swings in the horizontal plane, synchronously tightening the new oscillation stopping locating boat (8) and the new locating boat main anchor (9) which are arranged at one side of the open caisson in which large deviation and high amplitude of oscillation are produced, wherein the tensile force of a single anchor rope is controlled to be within 40t; synchronously tightening a side anchor (11) at one side of the steel open caisson where large deviation and high amplitude of oscillation are produced and the side anchor arranged at the other side of the steel open caisson (1), wherein the tensile force is controlled to be within 10t; and synchronously twisting a front locating boat (2) and a rear locating boat (5) with the steel open caisson (1). By applying the method provided by the invention, the amplitude of horizontal oscillation of the steel open caisson in a flood season construction can be controlled to be reduced, and the method is convenient to operate.

Description

Technical field [0001] The invention relates to the technical field of bridge construction, and in particular to a method for preventing horizontal swing in the construction of large deep-water steel caissons. It is suitable for deep-water bridge steel under the influence of deep water, high flow velocity, turbulence and eddy currents. The caisson is under construction. Background technique [0002] During the flood season construction of the deep-water caisson foundation of the existing bridge, due to the location of the foundation, the water is deep and the current is rapid, and the water level changes frequently due to the influence of the tide. In this case, the caisson is more prone to horizontal swings. Well stability is an important controlling factor in precise positioning of caisson. The following methods are usually used in construction: 1. Tighten the anchor rope to stop the swing, but because the swing range is large and sometimes small, when there is a larger swing,...

AI Technical Summary

Problems solved by technology

Usually construction adopts the following methods: 1. The anti-swing method of tightening the anchor rope, but because the swing amplitude is sometimes large and sometimes small, when there is a larger swing, each anchor rope is different due to the diameter, direction and the distance of the anchor position. First, the force is difficult to be uniform, which can easily cause the anchor rope to break; 2. Although the method of pushing the tugboat can reduce the tension of the main anchor rope and achieve the effect of preventing the caisson from swinging, the friction between the tugboat and the steel caisson , the loss of the hull is large, and the tugboat needs to be pushed for a long time; 3. The friction anti-swing method, in theory, the idea of ​​consuming the swing energy of the caisson is correct, but because the resistance of the friction device is too small, the effect of suppressing the swing The effect is not great, long-term operation, the sliding part is easy to wear, and it does not achieve the effect of stabilizing the horizontal direction of the caisson; 4. The balance weight prevents the swing, and the kinetic energy of the caisson swing is used to raise the balance weight, and the kinetic energy of the caisson is converted into a balance Heavy potential energy, and then use the hoist to lower the balance weight to the ship’s surface to consume its potential energy, and repeat this to reduce the swing and stabilize the caisson. This method is useful for eliminating the vertical swing of the caisson caused by the flood season or other conditions , the effect is more obvious, but for caisson horizontal swing, the effect is not obvious

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