After stirring the slurry or after encountering mechanical failure (except mixer) but not construction, do not stop the mixer and keep the fluidity of the slurry. The time interval between cement slurry mixing and pressing into the pipeline should not exceed 40min. The slurry storage time should not be exceeded. Long, when the inspection found that the fluidity can not meet the standard requirements, it should be abandoned. When the grouting pump is commissioned, the consistency of the slurry output from the slurry pipe can reach the consistency of the slurry into the slurry; the slurry can be squeezed only when the slurry is uniform and the consistency of the imported slurry is basically the same.
In hot climate conditions, grouting should use faster speeds. If the grouting speed is too low, the construction time will be longer and it will be detrimental to the various indicators of the slurry; however, when the grouting speed is too fast, attention should be paid to the pressure conditions in the grouting pipe and the tunnel, and the faster grouting speed is easier in the tunnel and Excessive pressure is generated in the grouting pipe, which results in the occurrence of slurry flooding and grouting pipe collapse in the tunnel.
The vacuum is maintained within -0.08 to -0.06 MPa and remains stable. After the slurry is pumped, the grouting pump is held at a pressure of 0.50 to 0.60 MPa for 3 minutes to ensure the compactness of the channel. The support plate is later removed and anchored. The steel pipe and ball valve shall be removed and cleaned in a timely manner to prepare the grouting for the next tunnel. The length of the slurry pipe connected to the vacuum pump is slightly longer, which makes it easier to observe the slurry and prevent the slurry from entering the vacuum pump, resulting in damage to the vacuum pump. However, the squeezing pump often enters the mud due to the presence of mud or large particles of hard objects. The body, resulting in damage, should be screened with a sieve to ensure the normal operation of the grouting pump.
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