A pile foundation grouting pressure test device and method based on optical fiber sensing

Abstract

The invention discloses a pile foundation grouting pressure testing device and method based on optical fiber sensing. The elastic capsule is filled with high-pressure oil through the external oil pump of the high-pressure oil pipe, so that the elastic capsule can be fully inflated and can effectively contact the slurry during the grouting process. The fiber-optic pressure sensor and data acquisition instrument in the high-pressure elastic capsule are used for real-time monitoring and storage. The dynamic change of the oil pressure inside the high-pressure elastic capsule is transmitted to the background processor. The present invention can effectively solve the problem of accurately determining the grouting pressure of the pile foundation and being interfered by human factors, and can adjust the grouting pressure parameters through the obtained accurate grouting pressure to ensure the reliability of grouting; secondly, it can be The accurate calculation of the grouting pressure at the grout outlet at the pile end forms a unified standard to accumulate test data, which provides a reference for the analysis of the return height of the pile end pressure grout.

Description

technical field [0001] The invention relates to the technical field of pile foundation grouting process, in particular to a pile foundation grouting pressure testing device based on optical fiber sensing and a working method thereof. Background technique [0002] Post-pile grouting technology is an engineering technology with strong practicability and a wide range of applications. It has been widely used in various fields such as underground buildings, bridges, subways, tunnels, transmission tower foundations, and offshore wind power. Improve the strength and stiffness of the soil, improve its stability and bearing capacity. At present, the domestic cast-in-situ piles adopt the post-grouting technology mainly to improve the defects of the construction process, increase the bearing capacity of the pile foundation, reduce the settlement, and then optimize the design of the pile length and save the project cost. Since the post-grouting project is a concealed project, its const...

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Problems solved by technology

However, the accurate calculation of the grouting pressure at the grouting outlet at the pile end has not yet formed a unified standard. Real-time and dynamic monitoring of grouting pressure parameters during grouting construction is particularly important for controlling grouting effect

[0003] In the field of pile foundation grouting reinforcement under complex environmental conditions such as ultra-thick soft soil stratum and abundant groundwater, the grouting monitoring equipment and technology are still relatively backward. Currently, the grouting pressure is still monitored by the grouting pump pressure gauge and the records are read manually , there is no professional device for pile foundation grouting to monitor the grouting pressure. Human factors have a certain degree of interference to pile foundation grouting, which limits the promotion of post-grouting technology

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