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Applicable strata and advantages of self-drilling bolts

Applicable strata and advantages of self-drilling bolts

  • Categories:Industrial News
  • Author:
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  • Time of issue:2019-12-16 17:57
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(Summary description)Generally speaking, self-drilling anchors are suitable for stratums suitable for anchor retaining walls and soil-nailed walls, as well as stratums suitable for prestressed anchor cables.

Applicable strata and advantages of self-drilling bolts

(Summary description)Generally speaking, self-drilling anchors are suitable for stratums suitable for anchor retaining walls and soil-nailed walls, as well as stratums suitable for prestressed anchor cables.

  • Categories:Industrial News
  • Author:
  • Origin:
  • Time of issue:2019-12-16 17:57
  • Views:
Information

  Generally speaking, self-drilling anchors are suitable for stratums suitable for anchor retaining walls and soil-nailed walls, as well as stratums suitable for prestressed anchor cables.

  For the anchoring technology that requires drilling operations, drilling often becomes the most critical process and directly affects the bearing capacity of the anchor rod. Hole collapse is more common when drilling holes in loose and groundwater-affected formations. Casing is required to follow up to increase the difficulty and cost of construction. Casing improves the drilling progress, but it has a negative impact on the bonding of mortar and hole walls. . After pores are formed in loose strata and rock formations with many pores and open cracks, high-pressure grouting can compensate for rock and soil defects. In this case, the consistency of the grout needs to be adjusted appropriately to fill the cracks with mortar to ensure the quality of the bolt.

  Self-drilling bolts are most suitable for pebble and boulder formations. After drilling, grouting can effectively reinforce the disturbed parts of the surrounding soil and expand the diameter of the anchor. If there is a small amount of water seepage during drilling, It can be achieved by blowing dry cement powder into the hole with high pressure wind direction. Form a temporary protective wall around the borehole to reduce collapse.

  At present, most anchor rods (including soil nails) and pre-stressed anchor cables are manufactured on site, and their production methods and processes directly affect their quality. The process flow is generally: drilling and anchor rod production, hole cleaning, and anchor rod installation. For grouting and compensating grouting, prestress is applied, fixed and end treated. The prestressed anchor cable is composed of multiple strands of steel stranded wires. Special equipment is required to apply the prestress. The construction quality is quite different. The self-drilling bolt set is produced in factory, which reduces the two factors of bolt production and installation. Through the process, applying prestress only needs to tighten the bolts to increase the bearing capacity by 25%, with reliable quality and improved work efficiency.

 

Applicable strata and advantages of self-drilling bolts

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