Slurry flowmeter

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1. How to calculate the slurry flow rate inside the high-pressure rotary jet pile?

The slurry flow rate of the high-pressure rotary jet pile needs to be calculated based on the design parameters, construction technology, and equipment operating conditions. The mainstream calculation paths are the design parameter matching method and the equipment rated parameter verification method.

1. Design parameter matching calculation method.

First, calculate the required amount of grout per linear meter for a single pile: multiply the theoretical cross-sectional area of the designed pile diameter by the grout density, and then multiply by the filling coefficient. The theoretical cross-sectional area is π multiplied by the square of (pile diameter/2); The weight of cement-based slurry is generally taken as 1300-1600 kilograms per cubic meter; The filling coefficient is adjusted according to the formation: the loose sand layer is taken as 1.5~1.8, the hard soil layer is taken as 1.2~1.4, and the silt layer is taken as 1.3~1.6

2. Calculate the total flow rate based on the construction lifting speed: the lifting speed is generally taken as 0.1~0.3 meters per minute, the soft soil layer is taken as the small value, and the hard soil layer is taken as the large value. The slurry flow rate is equal to the amount of slurry per linear meter multiplied by the lifting speed. If the unit of slurry per linear meter is liters per meter and the unit of lifting speed is meters per minute, the calculated flow rate unit is liters per minute; To convert to cubic meters per hour, it needs to be multiplied by 0.06

3. The rotation speed of the rotary spray rod needs to be synchronously matched, with a conventional val

II. Calibration Method for Rated Parameters of Equipment 1 Match the corresponding model of high-pressure grouting pump according to the pile diameter: pumps with a rated flow rate of 50~150 liters per minute are used for piles with a diameter of less than 500 millimeters, pumps with a rated flow rate of 150~250 liters per minute are used for piles with a diameter of 500~800 millimeters, and pumps with a rated flow rate of 250~350 liters per minute are used for piles with a diameter of over 800 millimeters. 2. The flow rate is measured on site through the flow meter at the outlet of the grouting pipe, and it is required that the measured flow rate is not less than 90% of the calculated regret dust value to avoid quality problems such as slurry breakage or insufficient spraying; Double tube rotary spray is a mixture of high-pressure water and compressed air with slurry, and the slurry flow rate is taken as 70%~80% of the calculated value of the source; Three pipe rotary spraying only uses slurry to supplement consolidation, with a flow rate of 50% to 70% of the calculated value.

2. Selection and advantages of HSD series electromagnetic flowmeter

The selection of HSD series electromagnetic flowmeter needs to be comprehensively considered based on flow range, measuring medium, pressure level, installation form and configuration requirements. Its advantages include small pressure loss, high measurement accuracy, wide range and bidirectional measurement capability.

1. The selection points of HSD series electromagnetic flowmeter should be based o

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