Uniform-thickness high pressure spraying grouting method used for diaphragm wall construction

Abstract

The invention discloses a uniform-thickness high pressure spraying grouting method used for diaphragm wall construction. The uniform-thickness high pressure spraying grouting method comprises the following step of performing construction in a variable-speed rotary jet grouting and spray rod variable-speed lifting mode by utilizing a grouter. A nozzle is a single large-diameter nozzle. Through the construction mode of variable-speed rotary jet grouting and spray rod variable-speed lifting, low-speed grouting is performed in the wall forming direction; the grouting time in the wall forming direction is prolonged through low-speed lifting of a spray rod, and the wall forming length in the wall forming direction is increased, so that construction of high pressure spraying grouting holes is reduced, and accordingly the efficiency of the high pressure spraying grouting construction is improved; the wall forming range is larger, and the construction efficiency is higher. The situation that the wall forming thickness at the position of the spray rod is much thinner than that at the jetting far end because of the affection of a tilt angle is avoided. An original double-nozzle structure is replaced through adopting the single nozzle, so that jet power and penetrating power of the nozzle are enhanced; slurry and a soil mass are thoroughly mixed; and impermeability of a wall body is improved. And meanwhile, the situation, which occurs when the double-nozzle structure is adopted, that wall forming on two sides is not symmetrical or wall forming is finished only on one side caused by clogging of a nozzle on one side is avoided.

Description

technical field [0001] The invention relates to a high-pressure jet grouting method, in particular to a constant-thickness high-jet grouting method used in the construction of anti-seepage walls. Background technique [0002] The existing high-pressure jet grouting methods mostly use rotary spray, fixed spray and pendulum spray, and adopt the general nozzle structure, the wall forming range is small, the grouting time is long and the efficiency is low, and the wall thickness at the far end of the spray is much thicker than that at the near end, and the wall thickness uneven. At the same time, the existing double-nozzle structure may have the problem of asymmetrical wall formation, and if one side of the nozzle is blocked, only one side will form a wall. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a constant-thickness high-spray grouting method for the construction of cut-off walls, which can make the thickne...

AI Technical Summary

Problems solved by technology

[0002] The existing high-pressure jet grouting methods mostly use rotary spray, fixed spray and pendulum spray, and adopt the general nozzle structure, the wall forming range is small, the grouting time is long and the efficiency is low, and the wall thickness at the far end of the spray is much thicker than that at the near end, and the wall thickness uneven

At the same time, the existing double-nozzle structure may have the problem of asymmetrical wall formation. If the single-side nozzle is blocked, only one side will form a wall.

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