A, advantage

This method has the advantages of strong drilling ability, high efficiency, good grooving quality and small environmental impact, etc. It can be widely used in the construction field of underground diaphragm wall of subway with hard stone and thick rock layer.

Second, the characteristics of

2.1 High efficiency: With the help of UCS valve, the double-wheel milling machine can adapt to all kinds of soil layers or rocks with the strength of 50 ~ 100MPa, with strong drilling ability and fast grooving speed.

2.2 Good pile quality: DMS electronic system of double-wheel slotting machine can monitor the working parameters and position of hydraulic double-wheel milling at any time; Professional equipment can correct the deviation of perpendicularity in time to ensure the construction quality.

2.3 Small environmental impact: the noise and vibration generated in the grooving process are small, and the impact on the surrounding buildings is small; At the same time cutting slag through the reverse circulation system and mud treatment system separation can be reused, environmental pollution is small, can meet the city underground construction of high environmental protection requirements.

2.4 Good Verticality Control: DMS system of dual-wheel milling equipment can effectively monitor the verticality of grooves, and adjust the verticality and rectify the deviation by adjusting X, Y and Z axes in time.

III. Scope of application

This method is applicable to the rock strata (50~100 MPa) with soft and hard interaction in the construction of underground diaphragm wall of subway.

Four, process principle

Double-wheel slot milling machine is a steel frame with hydraulic and electrical control systems, installed at the bottom of the 3 hydraulic motors, horizontal arrangement, motor on both sides drive two equipped with milling teeth of the drum. When milling grooves, the two rollers rotate at low speed, in opposite directions, the milling teeth will be milling and crushing the formation surrounding rock, the middle hydraulic motor drive mud pump, through the sand suction mouth in the middle of the milling wheel will be drilled and excavated rock slag and mud discharged to the ground mud station for centralized processing and then returned to the groove section, so reciprocating circulation, until the final hole into a groove. The verticality of the slot milling machine should be consistent with the axis of the slot segment, and monitored by two independent inclinometer. Its data are processed by the computer in the cockpit and displayed on the LCD screen, so that the driver can monitor and adjust the verticality of the slot milling machine at any time by changing the speed of the slot milling machine.