The so-called direct grouting method described by the grouting crew refers to the method of placing the grouting pipe directly into the soil through vibration or drilling. Depending on the different forms of the grouting pipe, the direct grouting method can be categorized into grouting pipe grouting, hollow pipe grouting, drill rod grouting, and plug grouting, etc.

Grouting through Grouting Tube Method refers to the method of grouting directly through the holes in the grouting tube; Grouting through Flower Tube Method refers to the method of grouting using a grouting tube (flower tube) with multiple grouting holes in the side wall; Drilling Rod Grouting Method refers to the method of grouting directly through the holes in the grouting tube. Drill rods are used for boring holes.

Grouting construction crew

Three grouting methods have similar construction steps:

(1) Lower Pipe

Grouting pipes are typically inserted into soil at predetermined depths using vibration methods in both grouting tube grouting and hollow pipe grouting techniques. For greater depths, vibration after pre-drilling at a certain depth can also be employed. The drilling rod grouting method directly places the grouting pipe (drilling rod) into the soil via drilling.

(2) Grouting

Connect grouting equipment, grouting pumps, and lower grouting pipes, and grout as required. Grouting is injected into the soil through the grouting pump. After the grouting section is completed, move the grouting pipe up and down as required to proceed with the construction of the next grouting section.

Compared to sleeve valve grouting, grouting with grout, grouting with grout, grouting with grout lines, pipe grouting, and drill rod grouting, their common drawback is the tendency to delay wall grouting and poor stratification effect. These drawbacks are particularly pronounced when using mud with good fluidity and long initial setting time. Their advantages include simple equipment and technology, good flexibility, fast construction speed, and quick adaptation to requirements. Rapid response scenarios.

Grouting in rock fissures typically employs the plug pressure method. The grouting pipe is equipped with a stopper that can seal the upper portion of the grouting section. The main construction steps are as follows:

(1) Grouting hole drilling

Rotary drills are commonly used for drilling. To determine the development and distribution of fissures in the strata, it is necessary to retrieve cores from all grouting holes within the strata. The core recovery rate for hard rock layers should reach 80-90%, with a crushing rate of 70%.