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Anchor Bolts The Safety Performance
Jul 10, 2017

In recent years, the external wall insulation board off the endless stream, Anchor Bolts resulting in more personal and property damage accidents, Anchor Bolts prompting more and more building insulation industry practitioners to re-examine the safety performance of insulation systems.

Building exterior insulation products at the beginning of the development, Anchor Bolts due to lower energy efficiency standards, and the use of better thermal conductivity of organic insulation materials, such as molded polystyrene board (EPS), extruded polystyrene board (XPS), Anchor Bolts hard foam Polyurethane plate (PUR), etc., the thickness of the general 3 ~ 5cm, insulation material weight lighter, insulation bolt length is generally not more than 10cm, external wall insulation system is still rare from the event. Anchor Bolts With the policy adjustment and intense competition in the market, high-rise buildings began to use a large number of rock wool, foam cement board and other inorganic insulation materials. Inorganic thermal insulation material itself thermal conductivity, Anchor Bolts to achieve the same insulation effect requires thicker material, and the apparent density is also organic insulation materials 5 to 20 times, around the building energy efficiency standards to further increase to 65% to 75% after the external wall insulation Thicker system thickness, greater weight, insulation anchor length is longer, Anchor Bolts the construction of the insulation system requires a higher level.

External wall insulation system is generally the main paste, mechanical fixed as a supplement. Paste the use of polymer modified cement-based adhesive, Anchor Bolts mechanical fixation is the use of insulation anchor. At present, the adhesive product quality and price of uneven, the unit area is also difficult to control the amount of business to reduce the cost of polymer powder tends to reduce the amount of polymer powder and the amount of mortar per unit area; Anchor Bolts and the adhesive can not distinguish the quality of the naked eye Therefore, Anchor Bolts the mechanical fixation of insulation bolts is particularly important.

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, Anchor Bolts 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 forces 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.

Insulation anchor bolt fixed in the base of the wall, Anchor Bolts when it is tension, the anchor bolt expansion end and the base material to form external friction and mechanical locking force. Plastic sleeves and metal screws produce internal friction, the sleeve has a tension. Anchor Bolts The following relationships are satisfied between the various forces.

The size of the external friction and the friction coefficient of the contact surface, the presence or absence of sliding particles, Anchor Bolts the compressive strength of the base material, the diameter of the pipe, and the total length of the expansion section. The greater the coefficient of friction, the drilling is about clean, the higher the compressive strength of the base material, Anchor Bolts the larger the diameter, the longer the total length of the expansion section, the greater the external friction.

Mechanical shear force, the final reaction in the casing expansion end and the drilling contact section of the shear force, the shear force and casing wall thickness, plastic shear strength, diameter d2, Anchor Bolts tilt angle α and other factors. The thicker the casing wall, Anchor Bolts the greater the shear strength of the plastic, the greater the diameter d2, the smaller the inclination angle α, Anchor Bolts the greater the ultimate shear force that the cross section can withstand, the greater the mechanical locking force.

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