Intelligent circulating prestress mud jacking system and control method thereof

Abstract

The invention discloses an intelligent circulating prestress mud jacking system and a control method thereof. A pressure compensation device is arranged on a mud jacking pipeline between a mud jacking pump and a mud inlet and comprises a piston and an elastic mechanism, wherein the end of the piston is communicated with the mud jacking pipeline, and the elastic force of the elastic mechanism drives the end of the piston to be pressed into the mud jacking pipeline. Pressurizers are arranged at the positions of the mud inlet and a mud outlet respectively to control the quantity of mud entering the duct of a beam component and the quantity of mud discharged from the duct of the beam component respectively. Electromagnetic flowmeters are arranged at the positions of the mud inlet and the mud outlet respectively to acquire flow signals of the mud inlet and the mud outlet. Two sets of mud jacking pump plungers are arranged to achieve mud jacking alternately, water and cement ratio control is achieved in a closed-loop control mode, and an effective circulation pressure value, a dwell pressure value, a lower dwell pressure limiting value and an upper dwell pressure limiting value and a dwell time value are set to control components and mud. The system has the advantages that mud pressure is stable, jacked mud is dense, and the quality of components is high.

Description

technical field [0001] The invention relates to the technical field of prestressed engineering, in particular to a prestressed intelligent circulation grouting system and a control method thereof. Background technique [0002] During bridge construction, the quality of prestressed grouting construction is crucial to the safety and durability of prestressed bridges, so post-tensioning prestressed pipeline grouting construction has become a key process in prestressed bridge construction. [0003] Chinese patent CN103711315 discloses a patent titled "Intelligent Vacuum Circulation Grouting System". In order to solve the problem of unstable grouting quality in traditional grouting systems, this patent adopts a technical scheme of setting a program-controlled three-way valve in the grout return pipe. The quality of grouting, but because the pressure of the grout changes during the transmission process, the grouting quality at some positions of the grout is unstable. [0004] Ch...

AI Technical Summary

Problems solved by technology

[0003] Chinese patent CN103711315 discloses a patent titled "Intelligent Vacuum Circulation Grouting System". In order to solve the problem of unstable grouting quality in traditional grouting systems, this patent adopts a technical scheme of setting a program-controlled three-way valve in the grout return pipe. The quality of grouting, but because the pressure of the grout changes during the transmission process, the grouting quality of the grout part is unstable

[0004] Chinese patent CN103711316 discloses the title: "Control Method of Intelligent Pulping System". The control of the patent is to control the weight of the main material and the auxiliary material separately. The control process is open-loop control. The final slurry water-cement ratio It is impossible to carry out more detailed control; and only one grouting pump is used, and only the holding pressure value is set in the automatic grouting step. The control method adopted is that if the pressure value drops below the pressure standard value during the holding period, the control center sends Grouting command, grouting again, until the pressure standard value is reached before maintaining the pressure, this method cannot effectively control the quality of grouting, resulting in unstable grouting quality

[0005] Due to the lack of strict control of the water-cement ratio (water-cement ratio is the main performance parameter of the slurry) in the traditional grouting process, the flow performance is often improved by increasing the water consumption on site, which eventually leads to excessive bleeding rate, forming voids in the pipeline and bleeding Free water, which accelerates the corrosion of steel strands

[0006] These problems existing in the above-mentioned traditional grouting process will seriously affect the durability of the structure. First, the steel strands lose their protection and are prone to corrosion. The corrosion of the tendons further weakens the bonding force of the slurry to the tendons, resulting in effective prestress drop

Second, there is a void in the pipeline, which prevents the steel strand and concrete from forming a whole to work together, reducing the structural rigidity and bearing capacity

Images