Measures for Handling Grouting Accident in High-pressure Stop Valve

In the high-pressure grouting construction, the flow resistance of the cement slurry at the end of grouting is very large (usually 5 MPa), the working pressure of the hydraulic system is high, a large amount of hydraulic oil flows back to the tank through the bypass, and the reversing valve is at 0 position. At this time, when the motor is restarted, the motor and the oil motor will rotate, and the hydraulic cylinder will not move and a "crash" will occur. This is the result of the action of the device safety protection device. You must remove the blocking wire located in the center of the reversing valve end cap, use a steel rod to move the valve core, and then screw up the blocking wire to work properly. In the actual construction, no matter whether the grouting is terminated or the pipe plugging accident occurs, “deadlock” will occur.

The above operation wastes time and fuel and is inconvenient. So we tried to replace the blocking wire with a stop valve (valve switch) in the liquefied gas pipeline. When a "crash" occurs, turn the globe of the globe valve by 90°, conduct the orifice, and insert the reversing valve with the 8th wire (or brazing rod). To reset the valve core, pull out the wire and close the stop valve to resume work. This greatly simplifies the operation and facilitates specific use.

When the grouting is terminated or the pipe plugging accident causes grouting to be interrupted, in order to prevent sedimentation in the pump or the high pressure hose, the slurry in the high pressure hose must be drained, and the grouting pump and the high pressure hose should be flushed with fresh water.

The traditional method is to empty the high-pressure hose connector directly. Due to the high pressure of the cement slurry in the high-pressure hose, jetting and hose lashing are prone to injury accidents, as well as site pollution and civilized construction.

According to the analysis, we believe that the emptying valve can better solve this problem. So a new three-way valve with shut-off valve is added at the exit of the high-pressure injection pump cement slurry. When the helium tube needs to be emptied, open the three-way valve. The shut-off valve (opening and closing valve) is depressurized, and then the hose is removed to avoid the dangers of directly detaching the joint head and simplifying the operation.

The above transformation was carried out on the site of the Zhangzhou Post and Telecommunications Bureau. After the comparison, the workers responded well. Undertaken the task of the pile foundation of the Hebei Julu Power Bureau building, a high-pressure grouting technique was adopted in the foundation pit slope protection, and both valves played a due role in the grouting construction. When dealing with accidents, the operation is simple, time and effort are saved, the location of draining oil is clear, control is flexible, and site hygiene is ensured. This is in stark contrast to the situation where other construction teams whip up and scramble in grouting. The equipment has not changed much, but the effect is obvious. It has been well received by the owners and supervisors.

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