A grouting method for underwater large-diameter bored piles in corrosion geology

Abstract

The invention discloses a grouting method for a corrosion geological underwater large-diameter drilled pile. The grouting method comprises the following steps of: (1) hole opening; (2) drilling to form the hole; (3) hole cleaning; (4) steel reinforcement cage placement, (5) guide tube lowering; (6) first batch concrete grouting, namely hoisting a large hopper, which is connected to the guide tube, onto a guide tube platform; arranging 2-4 concrete tank trucks and 2-4 ground pumps on the shore, wherein pump lines of the ground pumps are connected to the large hopper by means of a temporary floating bridge; the concrete tank trucks deliver concrete to the ground pumps, and the ground pumps pump concrete into the large hopper; after the large hopper is full of concrete, a ball is pulled out; and 2-4 ground pumps are employed to feed concrete at the same time; and (7) subsequent concrete grouting, namely after the completion of first batch concrete grouting, replacing the large hopper by a small hopper having the capacity of 2-5 m3 for grouting to a designed elevation. By means of the grouting method for a corrosion geological underwater large-diameter drilled pile, the construction difficulties of the corrosion geological condition and a wide river channel can be overcome, and the quality of the drilled pile can be improved so as to ensure the stability of the main tower of a bridge.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a pouring method for large-diameter bored piles underwater in eroded geological conditions. Background technique [0002] Bored piles are usually made by using a drilling rig to form pile holes in the foundation of the engineering site, and placing steel cages and pouring concrete in the pile holes. In the pile foundation construction of the main tower of the bridge, in order to ensure the stability of the main tower, it is often necessary to use large-diameter bored piles with large bearing capacity, that is, bored piles with a diameter greater than 2.5 meters. For the construction of large-diameter bored piles, due to the wide river channel and the need to drill holes in rock formations with karst caves and troughs, it is difficult to meet the construction requirements of large-diameter bored piles with existing construction methods, so the stability of the bridge main tower ...

AI Technical Summary

Problems solved by technology

In the pile foundation construction of the main tower of the bridge, in order to ensure the stability of the main tower, it is often necessary to use large-diameter bored piles with large bearing capacity, that is, bored piles with a diameter greater than 2.5 meters. For the construction of large-diameter bored piles, due to the wide river channel and the need to drill holes in rock formations with karst caves and troughs, it is difficult to meet the construction requirements of large-diameter bored piles with existing construction methods, so the stability of the main tower of the bridge sex is also difficult to further guarantee

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