Installation method for inner support of lock catch steel pipe or steel sheet pile cofferdam

Abstract

The invention discloses an installation method of lock catch steel pipe or steel sheet pile cofferdam inner supports. The method comprises the steps that upper-layer inner supports and lower-layer inner supports are manufactured; assembling a lower-layer inner support and a protective fence, installing a lower-layer hanging and limiting system, and integrally lowering the lower-layer inner support; assembling an upper-layer inner support and a protective fence, installing an upper-layer hanging and limiting system, and integrally lowering the upper-layer inner support; and upper and lower layer inner supports are reinforced, and upper and lower layer hanging and limiting systems are dismounted. The two layers of inner supports are manufactured and pre-spliced in a factory, the precision is high, the bracket is high in strength and rigidity, the bracket is connected with a lifting lug on a steel casing through a pin shaft, the number of times of mounting and dismounting is small, construction is convenient and fast, the splicing quality of the inner supports on the bracket is controllable, two crawler cranes are adopted for overall lowering layer by layer, and temporary hanging and limiting systems are used for fixing, so that construction is convenient and fast; and the inner support is also used as a lock catch steel pipe or a steel sheet pile inserting and driving positioning guide beam, so that the temporary guide beam investment is reduced, the construction safety and quality are easier to control, and the construction period is shortened.

Description

Technical field [0001] The present invention relates to the field of bridge construction, in particular to an installation method of locking steel pipe or steel sheet pile cofferdam support. Background [0002] With the rapid development of China's economy and society, the scale of infrastructure construction continues to increase, bridge construction is changing with each passing day, and the underwater foundation is also countless. The locked steel pipe or steel sheet pile cofferdam is composed of locked steel pipe or steel sheet pile and internal support, which can effectively prevent water and soil from entering the construction position of the building. The strength of the locked steel pipe or steel sheet pile cofferdam is high, it is easy to break into the hard soil layer, and it can be constructed in deep water, with less material usage, high recovery rate, and faster construction. In general, when the water pile is constructed, it is extremely widely used. [0003] When t...

AI Technical Summary

Problems solved by technology

[0004] 1. Before the locking steel pipe or steel sheet pile is inserted, it is necessary to install temporary positioning guide beams and protective railings on the water. The positioning effect of the single-layer guide beam is poor, and the insertion accuracy of the locking steel pipe or steel sheet pile is difficult to control, and the material The amount of investment is large, and after the installation of the inner support is completed, the temporary positioning guide beam and protective railing need to be removed;

[0005] 2. With the pumping of water in the cofferdam, the difference between the internal and external water head increases. At this time, the internal support has not been installed and cannot participate in the force, resulting in the gradual increase of water pressure on the locking steel pipe or steel sheet pile, and the increase in deformation. Leakage increases, and cofferdam plugging is difficult;

[0006] 3. When the cofferdam is pumped to a height of about 1m below the bottom of the upper and lower inner supports, the pumping needs to be suspended, and the upper and lower inner supports are installed layer by layer. Due to the work in the cofferdam, more personnel construction channels need to be added;

[0008] 5. When the hoisting machinery driver is working, the blind area is large, the number of hoisting is high and the hoisting is difficult; the installation personnel of the inner support are difficult to operate, the safety risk is high, the construction speed is slow, and the construction quality is difficult to control

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