Grouting and post-grouting consolidation technology for prefabricated piles by full-casing construction method

Abstract

The invention relates to a grouting and post-grouting consolidation technology for prefabricated piles by a full-casing construction method. The grouting and post-grouting consolidation technology isapplicable to the technical fields of foundation and ocean engineering. The background technology is that at present, in the technical fields of foundation and ocean engineering, cast-in-situ bored piles in rivers, lakes and the sea have long period and high cost due to links such as cofferdam island building. The grouting and post-grouting consolidation technology can remarkably overcome the defects mentioned above. According to the main content, after holes are formed by the full-casing construction method, cement slurry or mortar is poured into the boreholes while casings are hoisted so asto prevent the underwater boreholes from collapsing; before the cement slurry or mortar is solidified, the prefabricated piles made according to the design requirements are driven (sunk) into the boreholes by using a pile driver to the design elevation or are directly put into the borehole bottoms through the casings after the holes are formed, the cement slurry or mortar is poured, and then the casings are hoisted; and meanwhile, reserved grouting pipes in the prefabricated piles are used to inject grout to the pile bottoms and pile sides, the grout can be cement slurry, mortar and chemical grout, and finally the prefabricated piles and the stratum around the boreholes are tightly cemented and fixed together.

Description

Technical field: [0001] Foundation and Ocean Engineering Technology Background technique: [0002] At present, in the field of foundation foundation and marine engineering technology, the pile foundations in rivers, lakes and seas are mostly bored piles. The most common construction schemes and methods are cofferdam building islands or steel casings. At present, these construction schemes and methods are all completed. There are the characteristics of long construction period and high project cost. How to shorten the construction period and reduce the project cost is still a problem that needs to be solved at present. Invention content: [0003] The "full casing construction method precast pile grouting and post grouting consolidation technology" of the present invention is a new technical scheme and method after the improvement of the full casing construction method and the precast pile application technology method, which saves the need for cofferdam island building or u...

AI Technical Summary

Problems solved by technology

[0003] The present invention "full-casing pipe construction method prefabricated pile grouting and post-grouting consolidation technology" is a new technical scheme and method after the improvement of the full-casing pipe construction method and prefabricated pile application technology method, eliminating the need to build cofferdams or use Steel casings and other construction links are directly formed into piles, which can solve the problems of long construction period and high cost of pile foundations in rivers, lakes and seawater