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Anchor Bolts Insulation Materials
Jul 31, 2017

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 further increased to 65% to 75%, Anchor Bolts the external wall insulation The thickness of the system is thicker, the weight is bigger, the length of the insulation anchor is longer, Anchor Bolts and the construction level of the insulation system is higher.

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

Insulation anchor by the expansion of the disc with the casing and expansion components, expansion casing material is generally polyamide, polyethylene or polypropylene plastic, the expansion of the pieces are mostly galvanized metal nails. When used, first insert the plastic sleeve into the borehole, then tap or screw the metal screw. The expansion sleeve end in the drilling expansion and compression to produce friction; expansion end section is greater than the hole, but also the formation of a certain mechanical locking effect, Anchor Bolts 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 anchor is the mechanical locking force.

Insulation anchor bolt fixed in the grass-roots 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. The following relationships are satisfied between the various forces.

The size of the external friction and the friction coefficient of the contact surface,Anchor Bolts with or without sliding particles, the compressive strength of the base material, the diameter, the total length of the expansion section and other factors. The greater the friction coefficient, Anchor Bolts the drilling is about clean, the higher the compressive strength of the base material, 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, Anchor Bolts plastic shear strength, diameter d2, tilt angle α and other factors. The thicker the casing wall, the greater the shear strength of the plastic, the larger the diameter d2, the smaller the inclination angle α, Anchor Bolts the greater the ultimate shearing force of the section, and the greater the mechanical locking force.

The overall slippage of the anchor occurs at the interface between the casing expansion end and the base wall material. Base wall materials are mostly brittle materials, Anchor Bolts the destruction of local fracturing damage, while the resulting debris generated by sliding, Anchor Bolts reducing the friction coefficient. In the lightweight base material with low compressive strength, the external friction force is small when the pressure interface is crushed by the expansion end of the bolt, and the anchor is pulled to the mortar layer with higher compressive strength. Anchor Bolts The friction can be improved again.

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