T73-130mm/R38-76mm Self Drilling Anchor Bolt Drill Bit
Price:
Negotiable
MOQ:
1
Delivery Time:
20-30
Brand:
MIROC
Product Description
T73-130mm/R38-76mm Self Drilling Anchor Bolt Drill Bit
Product Description
Self drilling anchors can overcome the problems of difficult to drill holes in loose and broken soil. It can realize stabilization of side slope.
- The T73 self-propelled bolt can be connected with a grouting machine for grouting while drilling to achieve the anchoring effect. The construction efficiency is higher than that of ordinary hollow bolts, and it is suitable for broken and difficult-to-form surrounding rock.
- There is no need for casing wall protection during construction, which can greatly improve the construction efficiency, shorten the construction period and reduce the overall cost of the project.
- The hollow bolt body can be arbitrarily cut and lengthened by connecting sleeves. Therefore, the self-propelled bolt can also be constructed in the narrow space where large equipment cannot enter.
- Compared with the conventional drill pipe, the T73 self-propelled bolts is equipped with a variety of drill bits, which can be selected according to the properties of different rock layers and soil during construction, which can improve the drilling efficiency.
Features
- It adopts superior self drilling hollow anchor bolt, overall bolt has strong strength.
- Application range is broad
- Convenient for operation.
Hollow Anchor Bar
| Size | Outer Dia. (mm) | Inner Dia. (mm) | Ultimate Load (kN) | Yield Load (kN) | Weight (Kg/m) |
|---|---|---|---|---|---|
| SET73/53 | 73 | 53 | 1160 | 970 | 13.20 |
| SET73/45 | 73 | 45 | 1582 | 1270 | 17.80 |
| SET73/40 | 73 | 40 | 1865 | 1430 | 21.20 |
Coupler
| Size | Outer Dia. (mm) | Length (mm) | Weight (Kg/pc) | Note |
|---|---|---|---|---|
| SST73 | 89 | 235 | 3.82 | With sealing structure |
| 95 | 245 | 5.70 |
Spherical Collar Nut
| Size | Key Size (mm) | Length (mm) | Weight (Kg/pc) |
|---|---|---|---|
| SET73 | 95 | 70 | 1.90 |
Flat Plate
| Size | Dimensions (mm) | Thickness (mm) | Hole Dia. (mm) | Weight (Kg/pc) |
|---|---|---|---|---|
| SST73 | 175*175 | 34 | 80 | 6.85 |
| 250*250 | 40 | 80 | 18.00 |
Centralizer
| Size | Outer Dia. (mm) | Length (mm) | Weight (Kg/pc) |
|---|---|---|---|
| SET73 | 130 | 65 | 1.08 |
Drill Bit
| Size | Outer Dia. (mm) | Weight (Kg/pc) | Application Range (Advice) |
|---|---|---|---|
| EX | Sand, fills, gravel | ||
| SST73/130 | 130 | 4.00 | |
| SST73/175 | 175 | 6.80 | |
| EXX | Softer sedimentary rocks such as marls, mudstones, siltstone | ||
| SST73/130 | 130 | 4.00 | |
| Clay Bit | Clay, soft soil, marls, loose sand or gravel | ||
| SST73/150 | 150 | 4.00 | |
| SST73/200 | 200 | 5.60 | |
| SST73/250 | 250 | 6.75 | |
| SST73/280 | 280 | 7.60 | |
| SST73/175 | 175 | 5.20 | |
| ESS-F | Weathered rock, stone walls, rubble | ||
| SST73/130 | 130 | 4.70 |
1. Drilling preparation
The drilling angle, length, mix ratio of slurry, and selection of drill bits should be determined according to the rock formation. Most tunnel advance support will use 51, 76 self-propelled bolts. Adjust the drilling angle of the rock drill according to the terrain and geological conditions.
2. Drilling and grouting
When the Self-Drilling Anchor bolts is long and needs to be spliced, the drill bit should be put on the front end of the first section of the anchor rod, and the tail end of the rod body should be connected to the grouting machine through the rotary grouting adapter. When drilling, grouting is carried out, and the slurry is pressed into the hole and into the cracks of the rock mass to consolidate the rock mass and stay in the deep stable rock mass, and bond together with the stable layer as the slurry solidifies.
3. Anchor rod connection length
When there is 30cm left in the first section of the anchor rod, stop drilling, put a connecting sleeve with artificial lubricant on the tail of the previous section of the anchor rod, and then connect the second section of the anchor rod, and so on, until the drilling reaches Design length. At the end of the drilling, the anchor rod is exposed at least 10cm, which is convenient for installing the arched backing plate and the ball nut.
4. Pull test
After the construction of the self-propelled bolt, the pull-out force value test of the bolt should be carried out to check whether it meets the design value of pull-out force. For every 300 bolts in the operation area, no less than 3 bolts should be randomly checked for pull-out force test to ensure that the construction effect meets the expected requirements.
The above is the answer to the question of how to support the tunnel crossing the pebble layer. The quality of the support affects the safety of the tunnel construction. It is necessary to adopt supporting materials with rich successful supporting cases and rich construction case verification.
The Self-Drilling Anchor bolts produced by KSQ have many tunnel application cases, and can provide customers with a complete set of solutions. You are welcome to inquire.
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Company
KSQ Technologies (Beijing) Co. Ltd
Location
Room9-616, No. 10 Zhenxing Road (MDW Plaza), Changping District, 102200 Beijing, China
Contact Person
Yingkai Zhang