Hollow grouting anchor manufacturer, hollow grouting anchor

Hollow Grouting Anchor Manufacturer Hollow Grouting Anchor
Qingdao Hollow Grouting Anchor Hollow Grouting Anchor Specifications Hollow Grouting Anchor Price Hollow Grouting Anchor Manufacturer Hollow Grouting Anchor Purpose Hollow Grouting Anchor Quality
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Scope of application of hollow grouting anchors
Suitable for permanent support and advanced support under medium geological conditions. The hollow grouting anchor performs pressure grouting on the anchor through the hollow rod body to achieve the purpose of consolidating the broken rock mass, isolating groundwater and anti-corrosion of the rod body, and quickly forming a supporting force to control the stability of the surrounding rock.
Features of hollow grouting anchor
The hollow design realizes the grouting function.
The grouting is full and pressure grouting can be achieved.
The rod body has good centering properties and the mortar can wrap the entire length of the anchor rod body to avoid the possibility of rust and achieve long-term support.
The hollow grouting anchor is easy to install and can easily install the backing nut without on-site processing of threads.
The upward exhaust anchor head is used to completely solve the exhaust problem of hollow grouting anchors above the horizontal line.
Hollow anchor function
① Anchor suspension function The mining anchor passes through the weak, loose and unstable rock and soil mass and is anchored on the deep and stable rock and soil mass to provide sufficient pulling force to overcome the sliding rock and soil. The body's own weight and downward force prevent the cave wall from sliding and collapsing.
② Due to the extrusion reinforcement effect, the hollow grouting anchor will form a compression zone within a certain range around it after being stressed. Arrange the mining anchors in an appropriate manner so that the compression zones formed by adjacent anchors overlap each other to form a compression zone. The loose strata within the compression zone are reinforced with anchor bolts to enhance their integrity and improve their bearing capacity.
③ After the anchor rod of the composite beam is inserted into the ground to a certain depth, the layers will squeeze each other under the action of the anchoring force. The interlayer friction will increase, the internal stress and deflection will be greatly reduced, which is equivalent to the simple superposition of the numbers. Floor beams become composite beams. The bending stiffness and strength of the composite beam are greatly improved, thereby enhancing the load-bearing capacity of the ground. The greater the anchoring force provided by the anchor rod, the more obvious the effect.
④The length of the hollow grouting anchor is the total length required when the anchor can effectively perform its function according to the design. When calculated according to the suspension effect, it is the sum of the anchoring length, reinforcement length and exposed length. When calculated according to the function of composite beams, it is times the sum of the height and exposed length of the composite beam. The additional length due to uneven excavation contours should also be taken into consideration when determining the actual value.
⑤Anchor length The length of the anchor rod anchored into the stable stratum can be selected based on experience or calculation. Consider the anchoring method and anchor diameter when selecting based on experience. When selecting according to calculation, the bonding force between the mortar and the anchor rod and the bonding force between the mortar and the hole wall should be considered.
⑥The reinforcement length is determined by the height of the dangerous rock suspended along the direction of the anchor rod or the load height of the surrounding rock. It can also be determined by the thickness of the loosened zone measured by testing techniques such as acoustic waves.
⑦ Hollow grouting anchor pull-out test is one of the methods to test the anchor construction quality and determine the anchor pull-out force. Measure directly with an anchor pull gauge or torque wrench before the anchor is not covered with shotcrete. After clamping the anchor rod, pressurize slowly and evenly until the pressure gauge reading reaches the value corresponding to the design value or until the anchor rod is loosened. Generally, destructive testing is not performed. After the anchor rod is covered with shotcrete, the hollow grouting anchor rod is detected with an anchor rod detector, and then the mining anchor rod is dug out and then measured. The number of anchor rods to be tested shall be one meter per length of the cavern or each anchor rod. Each group shall not be less than one mining anchor rod and shall be evenly selected from a row of anchor rods in the same section of the inspection point.
Hollow grouting anchors are a tool for measuring anchoring force. They are small in size, light in weight, portable, easy to operate, simple and safe. Hollow grouting anchors are widely used in coal, national defense tunnels, transportation and other tunnel operations
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