Requirements for construction equipment and materials of double-wheel milling soil-cement mixed wall: Milling wheels with corresponding thickness should be selected according to wall thickness. For loose and weak soil layers, milling wheels with more milling teeth and stronger stirring ability should be selected. The milling wheel with less milling teeth and stronger cutting ability should be selected for dense and hard strata.
Double-wheel milling of soil-cement mixing wall Regulations on construction equipment and materials
1Should be selected according to the geological conditions, surrounding environmental conditions, wall depth, wall thickness and construction accuracy requirements, such as guide rod or suspension construction equipment.
2Construction equipment shall be equipped with emergency power supply and reserve emergency water source.
3The equipment shall be installed and adjusted after entering the site, and the construction of soil-cement mixing wall can be started after the test operation is normal. The equipment should be cleaned and maintained regularly during use.
4,Double-wheel milling of soil-cement mixing wall The main engine of construction equipment shall comply with the following provisions:
(1)The main machine frame shall have the function of vertical adjustment, and the main winch shall have the function of stepless speed regulation;
(2)The performance parameters of the frame should match the depth of the wall, and the milling cutter should be selected according to the formation conditions.
(3)The milling wheel should have the function of forward turning, reverse turning and adjusting speed.
(4)The main machine shall have the function of real-time display of milling wheel working pressure, milling wheel depth, milling wheel speed, milling groove verticality, cement slurry flow rate and cumulative cement slurry volume, main coiling and pulling pile force, wall forming time and other information;
(5)The sealing mechanism of milling wheel should be able to effectively prevent the entry of grout;
(6)The equipment shall have relevant limit device and alarm device;
(7)Guide rod type equipment main column and guide rod should have enough stiffness and firm connection, and should have the main leveling function, drill pipe guide device and mast vertical adjustment function;
(8)The milling head of suspended equipment shall have the function of guiding device and adjusting verticality.
5The milling wheel of corresponding thickness should be selected according to the wall thickness. For loose and weak soil layers, milling wheels with more milling teeth and stronger stirring ability should be selected.The milling wheel with less milling teeth and stronger cutting ability should be selected for dense and hard strata.
6,Double-wheel milling of soil-cement mixing wall The construction auxiliary equipment and technical requirements shall comply with the following provisions:
(1)Automatic pulping system should be adopted for pulping, and the pulping capacity should meet the construction requirements. The equipment should have automatic measuring device, and the water-glue ratio of pulping should be accurately controlled.The slurry flow of the grouting pump shall be adjustable, the total slurry supply per unit time shall not be less than the maximum slurry supply required during construction, and the rated grouting pressure shall not be less than 2MPa, and shall be equipped with metering devices;
(2)The matched air compressor should be selected according to the maximum wall depth design, and the working pressure of the air compressor should be0.8MPa~1.5MPa, the air supply should meet the construction requirements ;
(3)When bentonite mud is used, the total capacity of the bentonite mud tank should meet the maximum construction requirements;
(4)When using double slurry construction, it is advisable to equip with sand removal equipment, and should do a good job of recycling slurry;
(5)Guide trench excavation and mud cleaning should be equipped with excavator, excavator grab capacity should not be less than0.8m³;
(6)Suitable lifting equipment shall be provided for the assembly and disassembly stages of equipment;
(7)Cement canisters shall be provided to store bulk cement according to maximum construction requirements, and the cement silos shall be equipped with screw conveyors.
7,Double-wheel milling of soil-cement mixing wall Cement grout shall meet the following requirements:
(1)Automatic cement slurry mixing system should be selected for cement slurry mixing, slurry should be mixed evenly;
(2)The dosage of cement and water-binder ratio should be determined by field tests according to geological conditions and mechanical properties, and the dosage of cement should be increased in soft soil layers such as filling soil and silt soil.
(3)When the water and soil are erosive, suitable cement should be selected by test.
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