The double-wheel milling soil-cement mixing wall has large wall depth, wide range of formation adaptation, good continuity and uniformity, and excellent water interception and seepage prevention performance. In the engineering practice at home and abroad, it is commonly used as the water cutting curtain, the cutoff wall in hydraulic engineering and the isolation wall in environmental engineering. In some projects, the deep ground water is cut off by milled cement-soil mixing wall, and good results are obtained.
Double-wheel milling of soil-cement mixing wallBasic construction regulations:
1The double-wheel milling soil-cement mixing wall has large wall depth, wide range of formation adaptation, good continuity and uniformity, and excellent water interception and seepage prevention performance. In the engineering practice at home and abroad, it is commonly used as the water cutting curtain, the cutoff wall in hydraulic engineering and the isolation wall in environmental engineering. In some projects, the deep ground water is cut off by milled cement-soil mixing wall, and good results are obtained. The core material can be inserted into the deep stirred SOIL-cement mixing wall by milling to form the core SOIL-cement mixing wall enclosure with the functions of retaining soil and intercepting water. In addition, milled soil-cement mixing wall can also be used to reinforce diaphragm wall groove and foundation.
2,Double-wheel milling of soil-cement mixing wall The technology is applicable to a wide range of strata, for fill, clay, silt, sand, particle size is not greater than 200mm The compressive strength of the crushed stone soil and uniaxial saturation is not greater than15MPa And other strata have good application effect. For humic soil, peat soil, organic soil, polluted soil and other strata, The soil layer contains the components that affect the hardening of the curing agent, which will adversely affect the quality of the added solids, and its applicability must be determined by field test and detection results. In addition, for particles larger than 200mmThe compressive strength of the crushed stone soil and uniaxial saturation is greater than15MPa Complex geological conditions such as rock strata, as well as construction waste landfill soil, non-dense miscellaneous fill soil, etc., must also be determined by field test results of their applicability.
3, double milling mixing cement-soil wall technique in formation has certain scope of application, by the physical and mechanical parameters of rock and soil layer judgment in the applicability of the specific project, the technology and design and construction of the initial parameters, so the geotechnical engineering investigation report should be reflected according to the specification requirements in addition to the shear strength of soil, moisture content, the permeability coefficient, standard penetration test hammer blow count, And the number of conical dynamic probing hammer of gravel soil, the saturated uniaxial compressive strength of rock, the particle size and content of gravel and other indicators, but also should be identified in each layer of rock and soil PH Value, organic matter content and bad geology, so that technicians can make a reasonable judgment in the early stage of design.
4In order to ensure the construction quality of double-wheel milling soil-cement mixing wall, the quality of materials and products used in the project should be strictly controlled.
5, double wheel milling soil-cement mixing wall inserted rigid members can form the core soil-cement mixing wall enclosure structure. Core - cement - soil mixing wall insert core material is currentlyHIn recent years, there has also been a new trend of inserting composite steel boxes, steel tubes, precast square piles, precast concrete pipe piles and other prefabricated components into the soil-cement mixing wall, especially for the construction of superstructure after the space is narrow, the core material can not be recovered.
6Before the construction of double-wheel milling soil-cement mixed wall, the operation space and obstacles in the site should be mastered. The feasibility of construction is judged according to the actual operation space of the site. The type, distribution and depth of obstacles should be ascertained, if necessary by means of small auger drills, in situ tests and geophysical exploration. In order to create conditions for continuous construction, the obstacles affecting the construction of cement - soil mixing wall should be cleared in advance. To prevent the equipment damage caused by the forced construction of obstacles, and to avoid the temporary clearance of obstacles in the construction process and delay the construction period.
7, milling deep mixing cement-soil mixing wall before formal construction should choose the representative area for manufacturability try into the wall, on the one hand, test the technology in the applicability of the formation and performance of equipment, on the other hand, through the test in determining wall quality inspection into the wall, sinking and speed, amount of cement mortar, water-binder ratio and pumping construction process and parameters, such as, According to the test results, the corresponding adjustment is made to ensure that the wall depth, wall body strength, cement-soil cementation and impermeability meet the engineering requirements. When the geological conditions are complex and the area experience is insufficient, non-in-situ test wall should be used.
8, the surrounding environment has the protection requirements of the engineering, milling deep stir cement soil mixing wall construction should be laid before the soil survey, ground settlement and other monitoring points, in the test wall and formal wall construction process tracking monitoring, in order to master the soil and environmental deformation law during the construction, do information construction.
9The quality inspection and acceptance of milling deep stirring cement and soil mixing wall should be divided into three stages of quality inspection and acceptance according to the construction procedure before the wall, the wall and the wall after the wall. The raw materials and each process should be well closed, strictly according to the operating procedures and relevant standards.
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