First, the pipeline transportation parameters of the filling should be determined by experimental research. When there is no test data, it can be selected according to similar mine data.
2. When the weight concentration of the cemented filling mortar with a grading limit of 3 mm aggregate is 65% to 75% , the filling doubled line should not be greater than 5 ; when the weight concentration of the tailings cemented filling mortar is 65% to 75% , the filling doubled line should not be suitable. Greater than 8 .
Third, the choice of filling pipe type should meet the following requirements:
1 The vertical section of the main filling pipe should adopt manganese steel pipe or wear-resistant composite pipe with good wear resistance;
2 The horizontal section of the main filling pipe should adopt seamless steel pipe or wear-resistant composite pipe;
3 Filling pipe for filling the working face should adopt steel braided composite pipe or steel-plastic composite pipe.
4. The design of the filling borehole shall comply with the following requirements:
1 The slope of the filling port of the filling preparation station to the upper mouth of the filling hole should meet the requirements of the gravity gradient of the mortar;
2 The vertical section of the main filling pipe can be filled with drilling holes, and the filling hole deflection should be less than 1% ;
3 Filling holes shall be provided in the filling borehole. The gap between the pipe wall and the hole wall shall be 50mm . It shall be filled with high-grade pure cement slurry; the filling casing should be connected by welding or threaded pipe. The length of the threaded pipe should be 150mm. ~ 300mm ;
4 The walled casing shall be provided in the broken section of the rock through which the borehole is filled.
5. The laying of filling pipes shall comply with the following provisions:
1 The main filling pipe should not be located in the lifting well, and the large mine with long service life can be equipped with special filling well;
2 The extension pipe should be provided with a telescopic pipe at the upper part of the vertical section of the main filling pipe and the horizontal main filling pipe; the bottom part of the vertical section of the main filling pipe and the horizontal main filling pipe and the lower level of the horizontal main filling pipe should be provided with a sand discharging valve ;
3 The strength of the filling pipe joint should not be lower than the strength of the pipe connected.
6. For mines with deep well mining, the main filling pipeline with large height difference and long conveying distance should be installed at the appropriate position. There should be secondary mixing equipment in the filling and discharging station.
7. The ratio of the maximum particle size of the paste filling material to the conveying pipe diameter should not be greater than 1 : 5 ; the ultrafine particle content of -20μm should not be less than 15% . When the stability requirement is high, the ultrafine particle size of -20μm The content should not be less than 25% ; the paste which may stay in the pipeline for a long time should not be more than 2.0cm ; the dynamic viscosity coefficient of the paste should not be too large.
Eight, the use of stone or gravel cement filling, filling aggregate transportation is small, the mine car can be transported, the traffic volume should be transported by belt conveyor, and the filling aggregate and cement mortar should be mixed with the drop mixer.
2. When the weight concentration of the cemented filling mortar with a grading limit of 3 mm aggregate is 65% to 75% , the filling doubled line should not be greater than 5 ; when the weight concentration of the tailings cemented filling mortar is 65% to 75% , the filling doubled line should not be suitable. Greater than 8 .
Third, the choice of filling pipe type should meet the following requirements:
1 The vertical section of the main filling pipe should adopt manganese steel pipe or wear-resistant composite pipe with good wear resistance;
2 The horizontal section of the main filling pipe should adopt seamless steel pipe or wear-resistant composite pipe;
3 Filling pipe for filling the working face should adopt steel braided composite pipe or steel-plastic composite pipe.
4. The design of the filling borehole shall comply with the following requirements:
1 The slope of the filling port of the filling preparation station to the upper mouth of the filling hole should meet the requirements of the gravity gradient of the mortar;
2 The vertical section of the main filling pipe can be filled with drilling holes, and the filling hole deflection should be less than 1% ;
3 Filling holes shall be provided in the filling borehole. The gap between the pipe wall and the hole wall shall be 50mm . It shall be filled with high-grade pure cement slurry; the filling casing should be connected by welding or threaded pipe. The length of the threaded pipe should be 150mm. ~ 300mm ;
4 The walled casing shall be provided in the broken section of the rock through which the borehole is filled.
5. The laying of filling pipes shall comply with the following provisions:
1 The main filling pipe should not be located in the lifting well, and the large mine with long service life can be equipped with special filling well;
2 The extension pipe should be provided with a telescopic pipe at the upper part of the vertical section of the main filling pipe and the horizontal main filling pipe; the bottom part of the vertical section of the main filling pipe and the horizontal main filling pipe and the lower level of the horizontal main filling pipe should be provided with a sand discharging valve ;
3 The strength of the filling pipe joint should not be lower than the strength of the pipe connected.
6. For mines with deep well mining, the main filling pipeline with large height difference and long conveying distance should be installed at the appropriate position. There should be secondary mixing equipment in the filling and discharging station.
7. The ratio of the maximum particle size of the paste filling material to the conveying pipe diameter should not be greater than 1 : 5 ; the ultrafine particle content of -20μm should not be less than 15% . When the stability requirement is high, the ultrafine particle size of -20μm The content should not be less than 25% ; the paste which may stay in the pipeline for a long time should not be more than 2.0cm ; the dynamic viscosity coefficient of the paste should not be too large.
Eight, the use of stone or gravel cement filling, filling aggregate transportation is small, the mine car can be transported, the traffic volume should be transported by belt conveyor, and the filling aggregate and cement mortar should be mixed with the drop mixer.
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