Method for detecting pile foundation post-grouting quality based on multi-point ejection type sensor measuring technique

Abstract

The invention discloses a method for detecting pile foundation post-grouting quality based on a multi-point ejection type sensor measuring technique. The method includes the steps that firstly, sensors are installed, wherein the sensors with hydraulic cylinders or pneumatic cylinders are fixed to main ribs of a steel reinforcement cage and the signal acquisition input ends of an external acquisition instrument are connected with the output ends of the sensors; and the sensors are arranged upwards along the bottom of the steel reinforcement cage; secondly, the steel reinforcement cage is fixedly installed in a pre-dug pile hole of a filling pile; thirdly, after the steel reinforcement cage is put in place, the sensors are ejected out through the hydraulic cylinders or the pneumatic cylinders, and the ejected sensors make contact with the hole wall of the filling pile; fourthly, concrete is poured into the pile hole of the filling pile; fifthly, the acquisition instrument is used for reading numerical values detected by the sensors at various depths before grouting is performed; sixthly, grouting is performed; and seventhly, after grouting is finished, the acquisition instrument is used for reading numerical values detected by the sensors at various depths after grouting is performed; and through comparison of the numerical values before and after grouting is performed, the distribution state of grout in soil beside the pile can be obtained.

Description

technical field [0001] The invention relates to a method for detecting the grouting quality of a pile foundation based on a multi-point ejection sensor measurement technology, which belongs to the field of bridge pile foundation detection. Background technique [0002] The post-pile grouting technology can effectively reduce the pile length, improve the bearing capacity of cast-in-place piles, With the advantages of reducing pile settlement, shortening the construction period, and reducing the engineering cost of cast-in-situ piles, the post-pile grouting technology has obvious advantages and good application prospects. In recent years, it has been widely used in transportation, construction, water conservancy and other fields. [0003] However, since the pile foundation is a concealed project, it is difficult to judge the quality of the grouting construction after the pile foundation, and the geological conditions are changeable and complex. Finally, it is very difficult t...

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Problems solved by technology

[0003] However, since the pile foundation is a concealed project, it is difficult to judge the quality of the grouting construction after the pile foundation, and the geological conditions are changeable and complex. Finally, it is very difficult to evaluate the specific grouting effect. Up to now, it is mainly through measuring the ultimate bearing capacity of a single pile to evaluate whether the pile meets the design requirements. This method can only randomly select a part for representative testing, and cannot be applied to large quantities of piles. The evaluation of grouting effect can not directly evaluate the effect of grouting, but can only indirectly reflect the effect of grouting

Among the existing detection methods, there is no good quality detection method for the reinforcement effect of the grout in the bottom of the pile body and the soil around the pile.

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