Talking about the vacuum grouting construction steps

Talking about the vacuum grouting construction steps
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In the vacuum grouting construction process, first pre-stressed holes are laid out in strict accordance with the requirements of the design drawings, and then the plastic corrugated pipe used for forming the holes in the holes is fixed on the stirrups in the corresponding positions by positioning reinforcement. After tensioning the prestressed tendons, the exposed steel bars and steel strands shall be removed and the exposed length shall be controlled to be less than 30mm. Prepare the materials and tools used in the construction process, check the performance of vacuum pumps, mixers, grouting pumps, and accessories, and connect the vacuum grouting process equipment in sequence.

Test the vacuum: open the vacuum valve, other valves are closed, start the vacuum pump, when the pressure value on the vacuum pump reaches -0.08MPa, turn off the vacuum pump, observe the pressure value after about 1min, if the pressure value remains unchanged, then prove that the tube has been reached Vacuum state.

When cement slurry is mixed, water, cement, admixtures, etc. are weighed according to the design ratio, placed in a blender and mixed evenly, and poured into a slurry tank provided with a filter to prepare grouting. In the grouting process, the vacuum pump must continue to work.

After the grouting is over, the grouting pump must continue to work. Observe the pressure gauge value. When the pressure value is 0.7 MPa, maintain the pressure value for about 2 min, and fully complete the exhaust and bleeding process to ensure that the slurry in the bellows is dense. And full, at this point, the grouting is over, and the grouting pump and the grouting valve can be closed.

The end-sealing concrete should be made of concrete with little shrinkage or shrinkage, and it should be produced according to the design ratio, and the end capping work should be completed in time after the grouting is completed.

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