Method for calibrating synchronous grouting quantity and grouting pressure of shield

Abstract

The invention provides a method for calibrating synchronous grouting quantity and grouting pressure of a shield with super-large diameter. The method comprises the following steps: performing a slurry pumping test by combining the conventional synchronous grouting equipment of a shield machine and simulation strata pressure condition provided by a home-made slurry barrel for test; calculating and concluding loss of slurry pipeline pressure according to the slurry pump outlet pressure and the test device pipeline outlet pressure, and calibrating the actual grouting pressure of the shield with super-large diameter; and calculating and concluding the correction coefficient of single stroke grouting quantity of a piston of the grouting pump according to weight changes of a closed vessel before and after grouting the number of reciprocating motion times of the piston of the grouting pump so as to calibrate the grouting quantity of synchronous grouting of the shield with super-large diameter. Calibration of the grouting quantity of the synchronous grouting of the shield and the grouting pressure provides accordance for control of the shield machine by a 'double control' principle in synchronous grouting, so the method can effectively reduce the deformation of the rear and the late ground sedimentation, and shorten the stabilizing time of later sedimentation.

Description

technical field [0001] The invention relates to a method for calibrating synchronous grouting amount and grouting pressure of shield tunneling, and belongs to the technical field of construction engineering. Background technique [0002] In recent years, the rapid development of rail transit and cross-river tunnels in Shanghai has led to the rapid development of shield tunnel construction technology. In the soft ground in Shanghai, when the shield tunnel is used to construct the tunnel, synchronous grouting plays a very important role in the quality of the formed segment, the deformation of the surrounding soil layer, and the control of the surrounding structures and surface settlement. As far as the current construction technology is concerned, the construction parameters of synchronous grouting are generally based on controlling the settlement of the ground surface (or the settlement of surrounding buildings), and the purpose is mainly achieved by adjusting the amount of g...

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Problems solved by technology

[0010] Therefore, the technical problem to be solved by the present invention is that the existing synchronous grouting method for super-large-diameter shield construction can no longer fully meet the requirements for the quality of formed segments and surface settlement.

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