Shanghai Jintai SMC Engineering Method “Transformation of Surfaces” Helps Shandong Water Conservancy Construction

Recently, the Ministry of Water Resources issued a notice to determine that Shandong, Anhui, Zhejiang, Chongqing, and Yunnan provinces and cities are the “2016 water conservancy construction inspiring provinces and cities.” The incentive project is an arrangement made by the Ministry of Water Resources and the National Development and Reform Commission based on the comprehensive assessment of the central government's implementation of the central water conservancy investment plan, the actual scale of investment, and the completion of major water conservancy projects. Guided by this incentive policy, water conservancy construction in Shandong Province in 2016 ushered in new opportunities for development.

The performance of speeding up water conservancy construction in Shandong Province has been confirmed by the application of the SC series milling and agitating drilling rig from Shanghai Jintai SMC engineering and equipment in the local water conservancy construction field in the past two years.

In August 2015, Shanghai Jintai SC35 “started the test” in the construction of the cut-off wall of the Moon Bay Reservoir in Heze, Shandong, and successfully replaced the original “vibration-sinking mold” process. The SMC construction method was therefore highly recognized by local water conservancy construction companies. Since then, this new type of impervious wall construction method has been used in the area of ​​water conservancy construction in Shandong Province, and has entered the water conservancy projects such as Boxing Reservoir, Yanggu Reservoir, and Rizhao Underground Water Reservoir.

SC35 construction in Heze Moon Bay Reservoir

SC35 construction in Boxing Reservoir

SC40 construction in Yanggu Reservoir

SC40 Construction and Excavation Effect of Sunshine Groundwater Reservoir

SC40 Construction and Excavation Effect of Sunshine Groundwater Reservoir

The SMC (Soil Mixing Cutter) cement soil milling mixing wall method is a new type of underground deep mixing method that combines the technical features of a two-wheel milling process and a conventional deep cement-soil mixing process. Compared with some traditional deep mixing processes, the SMC cement-concrete mixing wall process has the following features:

(1) Advanced technology: SMC adopts techniques of excavation, lifting, grouting, gas supply, milling, cutting, and stirring to form a wall. It is not necessary to install a construction guide wall, and the curing agent (generally cement) is not discharged from the base soil and is injected. Mixing together to form a continuous wall of underground walls;

(2) Strong cutting ability, single wall width and large depth: The main working part of SMC Milling Mixing Machine is two milling wheels and the guide rod (frame body) connected to it. It is directly driven by a hydraulic motor, and can be both positive and negative. Rotate to the opposite direction, stepless speed regulation. The length of one-time wall can reach 2800mm, and the maximum depth of rectangular guide tube can be up to 60m.

(3) Tracking correction, trough rules, and high vertical accuracy into the wall: SMC milling milling machine parts are equipped with sensors for collecting various types of data. The operator can intuitively observe the mechanical through the touch screen in the control room. Working conditions (milling wheel straightening conditions, depth of milling, milling wheel resistance), and the corresponding operation, effectively control the verticality of the slot within 3 inches;

(4) The wall is homogeneous, strong in integrity, and has good seepage resistance: the wall is uniformly compacted by the joint action of milling, cutting, stirring, gas, and slurry; the connection between the wall and the web is a combination of complete milling, and the integrity is strong. Good anti-seepage performance;

(5) Convenient corners, which can be constructed along the curve: The SMC milling method has a low mechanical center, flexible operation, and the milling head can move flexibly up and down along the depth range, overcoming difficulties such as construction of the corners of the TRD construction method, arc foundation pits, etc. Good use of engineering;

(6) Wide application scope and high construction efficiency: through milling, cutting and stirring, the three-in-one movement can be used in constructions such as cohesive soil, sandy loam, and gravelly soil and their mutual staggered strata, as well as through complex stratums such as gravel and pebbles. Into the rock into the wall;

(7) Small environmental impact: The SMC double-pitch milling deep-mixing machinery enters the digging trench during the cutting and excavation process, thereby greatly reducing the noise and vibration. It is applicable to the construction of complex underground tunnel pipelines and high-density working conditions of surrounding buildings. . (This article comes from Shanghai Jintai)