Hollow grouting anchor rod slope protection nut pad support tunnel 25 composite hollow mortar mining anchor rod

The company is a professional machinery manufacturer in Henan Province, specializing in the development and sales of road machinery, environmental protection machinery, tunnel slope support equipment, pre-stressing equipment, highways, subway culverts, light rail high-speed rail, mining resource mining, coal and non coal mining fields. Its main products include: intelligent tensioning, intelligent grouting, splitting machines, shot blasting machines, anchor drilling vehicles, asphalt joint sealant, asphalt joint grouting machines, and non curing spraying machines. It is a comprehensive research and development center, A mechanical manufacturer that integrates sales, online and offline.

Why is it called a hollow anchor rod? Its specific function is grouting, so it is also called a grouting pipe. It can be rotated in the overall design to first pressure, and under pressure, the internal slurry flows out. This not only plays a fixed role for itself, but also enters the anchor hole when the slurry overflows, playing a role in fixing the surrounding rock. It can play a rapid supporting role in the initial stage, allowing the deformation of the surrounding rock to be well controlled, and it is precisely under this effect that it can have a good stabilizing effect. In terms of design, it uses a hollow form that integrates the anchor rod and grouting pipe. It is precisely this design that has great advantages. If it is a traditional grouting pipe, it may cause loss due to back-and-forth pulling, which will not occur. It can effectively improve the quality of the project, which is precisely because it can achieve a great degree of fullness during grouting, and at the same time, it can achieve the effect of pressure grouting. Its neutrality is good because when used, other accessories are added, which increases its neutrality. This way, the slurry can wrap the entire hollow anchor rod, and it is precisely because of this that rust will not occur during use, truly achieving long-term use. It is also very convenient for installation, which is also very important. Only by making installation convenient can the time for debugging and construction be shortened. At the same time, without the need for more screws, the requirements for installing nuts and pads can be met.

During the drilling process, due to the downward displacement of the drilling tool under the action of gravity, the drilling rig will tilt up, and the longer the hole is drilled, the more obvious this phenomenon becomes. Therefore, the inclination angle for drilling in place should be less than the design inclination angle. Before the construction of eccentric hollow anchor rods, the impactor, eccentric hammer, centralizer, casing shoe, and pneumatic DTH hammer should be checked one by one to ensure their normal operation. The eccentric hammer should be able to rotate flexibly, the connecting pin and locking mechanism should be firm, the connection between the drill pipe and DTH hammer and eccentric drilling tool should be reliable, and the casing and casing shoes should not have cracks. When drilling with a drill pipe, after confirming that the drill bit is in contact with the gravel soil layer, first turn around and wait until it is normal before turning on the air for pulse drilling. Every 0.3 m to 0.5 m of drilling should be blown with strong wind to keep the hole clean. When blowing holes, the lifting distance of the drilling tool should be strictly controlled; During the drilling process, it is prohibited to pull up the drilling tool or reverse the drill pipe back and forth. When the eccentric rotating part is stuck by rock debris and cannot collapse, the air compressor should be started to clean the borehole again. The DTH hammer should work for a short time, then try to lift again, and so on, until the drilling tool is lifted.

The length of the follow-up pipe can be determined based on actual geological conditions. When the current conduit does not need to be in place and the depth of the lower conduit reaches the required depth, a conventional drill bit can be used for bare drilling. After the cable is successfully laid, the sleeve can be pulled out. When pulling out the casing, first install the extractor base on the surface of the base, and then symmetrically install and fix the oil cylinder on the base from left to right or from top to bottom. Then, install the top plate and casing slips. After installation, start the oil pump cylinder to inject oil and use the hydraulic transmission principle to pull out the casing. When installing the oil cylinder, the extension direction of the oil cylinder should be consistent with the axial direction of the housing to prevent the housing from breaking due to asymmetric stress

No matter what type of hollow anchor rod, its construction quality requirements are similar. The five quality requirements for hollow anchor rod construction are hoped to be helpful for you to grasp the construction of hollow anchor rods!

1. The material, type, and product structure of hollow anchor rods must meet the requirements of design and specifications in terms of quality, specifications, quantity, and performance

2. The length of the hollow anchor rod inserted into the hole shall not be less than 95% of the design length.

3. The grouting strength of the combined hollow anchor rod shall not be less than the design and specification requirements, and the grouting inside the hollow anchor rod hole shall be dense and full.

4. The hollow anchor rod pad should meet the design requirements, and the pad should be tightly attached to the surrounding rock. If the surrounding rock is uneven, it should be filled with M10 mortar.

5. The hollow anchor rod should be arranged perpendicular to the excavation contour line. After the construction of the hollow anchor rod is completed, we need to conduct quality inspections on it.

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