Self-drilling (Self-propelled) Hollow Grouting Anchor

Self-drilling (self-propelled) hollow grouting anchor is consisted of carbide drill, hollow full-thread anchor bolt body, stop-grouting plug, backing board, nut, adapter sleeve, etc.

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Product description

Parameters

Structure

Self-drilling (self-propelled) hollow grouting anchor is consisted of carbide drill, hollow full-thread anchor bolt body, stop-grouting plug, backing board, nut, adapter sleeve, etc. It is a kind of anchor bolt structure in which a carbide drill is installed at the head of the anchor body and directly drill and grout without taking out.

Characteristics

1. This is the best construction scheme for complex geological conditions such as broken surrounding rock, weak surrounding rock, high ground stress and large deformation, for it avoids the influence of hole collapse on construction.

2. Hollow design makes the anchor realize the function of grouting pipe and avoid the loss of mortar when the grouting pipe is pulled out during traditional construction technique.

3. The grouting is full, and pressure grouting can be realized to improve engineering quality.

4. The centricity of the anchor body is nice due to the roles of accessories. The mortar can wrap the whole anchor body, avoiding the danger of corrosion and reaching the target of long-term support.

5. The installation is convenient. Backing board and nut can be installed conveniently without processing screw thread on site.

Construction Method

It is mainly applied in complex geological conditions such as broken surrounding rock, weak surrounding rock, high ground stress and large deformation and any situations of self-drilling grouting such as support, rescue and treatment of landslide. It has wider application range and higher functions. A carbide drill is installed at the head of the hollow anchor body, and replacing drill rod with anchor body for drilling. The drill tail connecting rod connects the anchor body with the jackdrill. After drilling to the designed depth of anchor bolt with jackdrill, install stop-grouting plug, backing board and nut, and then carry out grouting. In the construction of slope support or hydropower station, large diameter anchor bolt can also be used to replace the hole drill pipe for drilling grouting, which has greater power, stronger effect than anchor cable, is faster and more convenient, and has lower construction cost.

Mechanical Parameter of Self-propelled Hollow Anchor Body

Reference Standard I:GB50086-2015

Model	Specification	Stretching Resistance (KN)	Stretching Resistance (KN)	Note
25	25×5	≥180	≥10
28	28×5.5	≥220	≥10
32	32×6	≥290	≥10
38	38×6	≥360	≥10
42	42×6.5	≥420	≥10
51	51×8	≥640	≥10
76	76×9	≥1000	≥10