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Anchor Bolts Collectively
Jun 28, 2017

Anchor Bolts But many designers and construction workers on what is after the end of the expansion bolt, after the end of the anchor how to classify, is not very clear. Then I will analyze one by one several anchor, hoping to give you help.

After the end of the anchor bolt can be used for seismic fortification of the load-bearing structure of the mechanical bolt, collectively, Anchor Bolts after the expansion of the end anchor, including the expansion from the end of the bolt, mold bottom bolt and adhesive die expansion bolt three categories (Figure 1 ). Anchor Bolts The classification of these three types of anchors depends largely on how they are installed.

First of all, since the expansion of the anchor bolt to drill a straight hole, Anchor Bolts and then the bolt into the hole through the hammer on the mounting rod and bolt expansion sleeve on the slot combined with the hammer, in the hammer under the hammer Through the bolt at the bottom of the column cone makes the lower bottom of the knife head (must be embedded in diamond or tungsten carbide) and coagulation cutting, cutting a tapered step, Anchor Bolts forming a lock key effect. Judging the anchor is based on the anchor sleeve itself is not inlaid with diamond or tungsten carbide blade, because the concrete itself is greater than the hardness of carbon steel. This type of bolt with the specifications of a larger shear value (with a large sleeve), with the specifications of the drilling diameter, Anchor Bolts expensive, with a mechanical bolt common problem - easy relaxation, poor corrosion resistance, not recommended In areas with dynamic loads or corrosive environments.

Second, the expansion of the bottom bolts need to drill a straight hole, (note that the following is the difference with the self-expanding bolt) and then use a special mold to expand the end of the tool in a straight line to push the pressure (from the vertical Under pressure) reaming, Anchor Bolts reaming after the anchor into the bottom hole, plus the torque so that the bottom of the bolt expansion and expansion of the bottom of the hole before the formation of the lock key effect. Judging the basis of this anchor is mainly to see whether the use of special hole expansion tool to push the way the pressure of the way the hole. This kind of anchor bolt is low, Anchor Bolts mainly depends on the cost of the hole expanding tool, with the common problem of mechanical bolt - easy relaxation, poor corrosion resistance, not recommended for dynamic load or corrosive environment area.

Finally, the adhesive die to expand the end of the bolt, see the name also know that it is first a mold bottom bolt, and in the mold at the end of the anchor on the basis of the adhesive will become a glue die expansion bolt, After the reaming hole into the hole into a part of the adhesive, Anchor Bolts and then complete the mold bottom bolt installation process. Judging the basis of this bolt and the basic expansion of the end of the bolt, but more importantly depends on the quality of adhesive. The price of such anchor is mainly to see the cost of drilling tools to prevent the common problem of mechanical anchor - easy relaxation and corrosion problems. Anchor Bolts To meet the design capacity under the premise of almost any area can be used.

Insulated anchor bolts consist of expansion sleeves and swells with discs. The expansion sleeve material is generally polyamide, polyethylene or polypropylene plastic, Anchor Bolts and the expansions are mostly galvanized metal nails. When used, first insert the plastic sleeve into the borehole, then tap or screw in the metal screw. The end of the expansion casing in the drilling and expansion of the extrusion friction to produce friction; expansion end section is greater than the hole, but also the formation of a certain mechanical locking effect, by the role of tensile force in the expansion of the shear force. Different types of anchors have different frictional and mechanical locking forces. If the main force of the percussion anchor is the friction force, Anchor Bolts and the main force of the knotting insulation bolt is the mechanical locking force.

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