Foundation anti-scouring early-strength grouting material for underwater cast-in-place pile foundation and application of foundation anti-scouring early-strength grouting material

Abstract

The invention discloses an anti-scouring early-strength grouting material for an underwater cast-in-place pile foundation and application of the anti-scouring early-strength grouting material. The grouting material comprises cement, an early strength component, a delayed coagulation component, an activator, a fluidity maintaining component, an underwater anti-dispersion flocculant, steel slag powder and fly ash. All the components of the grouting material are accurately metered and then premixed in a factory to form a dry mixture, water is added into the dry mixture, the dry mixture is stirred by a forced stirrer to form slurry, and the slurry is pumped to the root of a pile foundation through a pipeline within half an hour. The grouting material stirred by adding water can be pumped to the root of a pile foundation through a pipeline within half an hour, is not dispersed during underwater grouting, and can be self-leveled to a protective area around the pile foundation; and the strength development is fast, the unconfined compressive strength in 6 hours is greater than 200 kPa, and the unconfined compressive strength in 1 day can reach 400 kPa.

Description

technical field [0001] The invention relates to the field of scour protection for the pile foundation of underwater structures, in particular to an anti-scour early-strength grouting material for an underwater cast-in-place pile foundation and its application. Background technique [0002] Under the action of sea currents and waves, the large-diameter pile foundation of underwater structures will cause strong water currents or high-speed rotating eddies in the local sea area around the piles. The pit will weaken the sinking capacity of the pile foundation and endanger the safety of the pile foundation and the upper fan. [0003] Traditional pile foundation erosion protection measures include the following: ① Throwing and filling (including sand-throwing bags, riprap, prefabricated concrete components, etc.); ② Geotextile compaction (sand quilt, geotextile compaction, interlocking blocks, etc.); ③Bionic aquatic weed management; ④Reserve scour length, etc. For example, paten...

AI Technical Summary

Problems solved by technology

Although this is economical and environmentally friendly, there are also several obvious disadvantages: ①The proportion of on-site silt and curing agent is inaccurate; Insufficient stirring of the agent leads to large fluctuations in the performance of the stabilized soil. ④The curing agent formula usually contains more than 10% quicklime used to reduce free water content (such as authorized patent CN 102295442 B). The reaction between quicklime and water releases a large amount of heat, which is not conducive to There are potential safety hazards in storage and on-site use

In addition, traditional curing agent materials are usually based on portland cement, whose strength develops slowly and sets for a long time, and scour pits may be formed in the early stage of pouring

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