The hollow grouting anchor rod is assembled from a metal rod body and its accessories. The metal rod body is made of cold-rolled seamless steel tubes with continuous left-handed threads on the surface. Hollow grouting anchor is a product that combines drilling, grouting and anchoring functions. Hollow grouting anchor is suitable for permanent support and advanced support in medium geological conditions. Through the pressure grouting of the hollow rod body of the anchor rod, the purpose of consolidating the broken rock body, blocking the anticorrosion of the gas or groundwater and the rod body can quickly form the supporting force and control the stability of the surrounding rock. The hollow design enables the anchor rod to realize the function of the grouting pipe, which not only avoids the loss of mortar caused by the traditional construction process when the grouting pipe is pulled out. Moreover, the grouting is full, and pressure grouting can be realized, which improves the engineering quality. Due to the role of various accessories, the centering performance of the rod body is good. The mortar can wrap the full length of the rod body to avoid corrosion and achieve the purpose of long-term support.

Main technical parameters of hollow grouting anchor：

Project	MZGK110-42/25	MZGK210-50/32
Rod outer diameter（mm）	25	32
Rod inner diameter（mm）	15	18
Wall thickness（mm）	5	7
Straightness（mm/m）	≤2	≤2
Screw pitch（mm）	12.5	12.5
Thread height（mm）	1.5	1.5
Rod length（mm）	（1400～2600）±10	（1400～2800）±10
Minimum anchor length（mm）	1000	1000
Applicable drilling diameter（mm）	42	50
Rod maximum force（kN）	≥110	≥210
Rod elongation（%）	≥6.0	≥6.0
Anchoring force（kN）	≥80	≥130
Threaded nut bearing capacity（kN）	≥80	≥130
Pallet carrying capacity（kN）	≥80	≥130

 

The scope of products： 

        It is mainly used for mine roadway reinforcement and slope protection of roads and bridge foundations. The hardness coefficient of the reinforced rock mass is <7.

       Enterprise standard (Q/AKT10-2012 "Hollow Grouting Anchor Rod" and MT 146.2-2011 "Resin Anchor Rod Part 2: Metal Rod Body and Accessories").

 

User's manual

(1) Drilling: Drill and clear holes with a common rock drill.

(2) Insert the anchor rod: Insert the hollow grouting anchor rod with the anchor head installed into the hole, and the barbs on the anchor head immediately hang the anchor rod.

(3) Install the slurry stopper, tray, and nut.

(4) Connect the grouting machine: connect the tail of the anchor rod to the selected grouting machine through a quick grouting joint.

(5) Grouting: ① The grouting uses bottom-up, left-right sequential operation. After the grouting is completed, determine whether to re-inject and re-inject according to the observation results. ② After connecting the grouting equipment, first use water to test injection. After confirming that the system connection is accurate and reliable, normal grouting can be performed. ③ Cement No. 425 is formulated into cement paste at a water-cement ratio of 1:1.5, and the grouting liquid prepared after stirring in the mixing container for 5 minutes. ④Turn the pump to grouting according to constant pressure and quantitative control. During the grouting process, the changes of each grouting parameter should be recorded at any time to observe the deformation of the roadway surface. If the leakage slurry or the roadway deformation or roof collapse are found, the injection should be stopped immediately. Pulp.