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    Hollow anchor technology strip
    作者:管理員    發布于:2019-09-02 15:32:26    文字:【】【】【
    Hollow bolt technical conditions

    (1) The tensile strength of a single anchor of a hollow anchor should not be less than 180KN; the anchoring resistance of the anchor: the type II surrounding rock is not less than 80KN; the surrounding rock of class III and above is not less than 100KN.
    (2) The hole position deviation of the anchor should be controlled within ±1.5cm.
    (3) After the anchor is installed, select at least 3 out of 300 for the pull-out force test, and make another set when the surrounding rock conditions or raw materials are changed. The uniform pull-out force value of the same set of 28-day anchors should meet the design requirements; the minimum pull-out force of each anchor should not be less than 90% of the design value.
     
     Structural features of hollow anchors
      In order to fundamentally overcome the drawbacks of ordinary mortar anchors, improve the construction technology and working characteristics of the anchors, and ensure the quality of the bolt works, Hangzhou Tuqiang Company has developed RD ordinary hollow grouting bolt series and EX steel quality in recent years. Shell hollow grouting anchor series, SD self-propelled hollow grouting anchor series and YD prestressed hollow self-propelled grouting anchor, and corresponding DML30-2 type bolt special grouting pump and torque wrench The complete hollow grouting anchor system is formed, which can meet the requirements of geotechnical anchoring engineering with different stratum and different design bearing capacity.
      The ordinary hollow grouting anchor is composed of a hollow anchor body, a hard plastic anchor head, a stopper plug, a pad and a nut: the steel grouting hollow grouting anchor is composed of a hollow anchor body and a steel climbing shell anchor head. The composition of the slurry stopper, the pad and the nut; the S-type hollow grouting anchor is composed of a hollow anchor body, a self-propelled drill bit, a coupling sleeve, a stopper plug, a pad and a nut; the prestressed hollow missing grouting anchor The rod consists of a hollow anchor body, a self-propelled drill bit, a connecting sleeve, a centering device, a PE sleeve, a free section steel sleeve, a stopper plug, a backing plate and a nut.
    Characteristics of hollow grouting anchor
      The hollow grouting anchor has the following characteristics, which greatly improves the reliability and adaptability of the anchor.
      a. Ordinary hollow grouting anchor is inserted into the hollow rod first. After that, the cement slurry is poured from the inside to the outside in the cavity of the hollow rod body, and the outer port of the anchor hole has a stopper plug and a pallet, which can effectively prevent the overflow of the slurry and ensure the full grouting between the rod body and the hole wall, so that The shear stress and tensile stress are transmitted along the entire length of the bolt to ensure that the rock mass within the anchorage is strengthened. If necessary, pressure grouting can also be carried out to allow the slurry to penetrate and diffuse into the cracks of the rock mass around the shaft, so that the rock mass within the anchorage range can be further reinforced.
      b. After the grouting is solidified, the nut can be tightened with a torque wrench to provide a plate resistance of about 10KN. A spherical pressure zone similar to the mechanical anchor is formed at the end of the anchor rod (as shown in the figure), thereby controlling the initial stage after the excavation of the rock mass. Deformation prevents the broken rock from falling.
      c. The hollow shell grouting anchor rod or the prestressed self-propelled hollow grouting anchor rod can be used to actively transfer the tensile load to the rock and soil body by tightening the nut or the tensioning device, and the spherical or conical pressure at the end of the anchor rod The area is significantly increased (Fig. 5c, 5d), and the well can improve the shear strength of the weak structural surface or the latent slip surface. The shell-up or self-propelled prestressed anchors arranged at a certain distance can make the rock mass within the anchorage range constitute a compressive stress arch belt, which obviously enhances the stability of the tunnel or slope engineering.
     
     
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