Prestress hole channel grouting quality control method based on double parameters of flow and density

Abstract

The invention discloses a prestress hole channel grouting quality control method based on double parameters of flow and density. The prestress hole channel grouting quality control method judges screen grout pressure maintaining time tk by detecting the flow of an inlet end and an outlet end and water cement ratio density, and then bridge girder prestress hole channel grouting construction is controlled. The prestress hole channel grouting quality control method can control bridge girder prestress hole channel grouting construction quality, guarantees the grouting quality, and effectively resolves the problem that the grouting quality can not be guaranteed under the condition of manual grouting in the prior art. The screen grout pressure maintaining starting time tk is judged whether the tk meets the following two requirement: firstly, a measured flow QA of a flow meter at a grout inlet end A is close to a measured flow QB of a flow meter at a grout outlet end B, the difference value between the QA and the QB is (QA-QB), the average value between the QA and the QB is (QA+QB)/2, and the percentage value between the (QA-QB) and the (QA+QB)/2 is smaller than or equal to a positive or negative permissible error value delta; and the secondly, the water cement ratio density detected by a density transmitter at the grout outlet end B meets the grouting technological requirements.

Description

technical field [0001] The invention relates to the grouting construction of a bridge prestressed channel, in particular to a method for controlling the quality of bridge prestressed channel grouting. Background technique [0002] The prior art bridge prestressed channel grouting construction relies on on-site construction operators to observe with the naked eye, operate manually, operate the grouting pump at the entrance of the grouting channel, and close the angle valve to screen the grout at the outlet of the grouting channel. Construction operation standards, responsibility and professional ethics are used to control the construction quality, so it is difficult to guarantee the construction quality, and it is easy to have incomplete grouting, pores and bleeding, which lead to hidden dangers in the project. Although there are individual projects that use grouting recorders in the grouting construction of prestressed tunnels, they can only passively record the grouting con...

AI Technical Summary

Problems solved by technology

[0002] The prior art bridge prestressed channel grouting construction relies on on-site construction operators to observe with the naked eye, operate manually, operate the grouting pump at the entrance of the grouting channel, and close the angle valve to screen the grout at the outlet of the grouting channel. Construction operation standards, responsibility and professional ethics are used to control the construction quality, so it is difficult to guarantee the construction quality, and it is easy to appear that the grouting is not compact, pores and bleeding occur, which leads to hidden dangers in the project

Although there are individual projects that use grouting recorders in the grouting construction of prestressed tunnels, they can only passively record the grouting conditions on site, and cannot control the quality of grouting construction. question

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