Briefly describe the practical impact of a bolt on project construction

The beam side anchoring curtain wall keel steel connecting piece bolts the steel connecting piece, installs the steel beam and the steel piece, and provides the welding fixing point for the curtain wall keel rooting. The new bathroom practice is to remove the prefabricated round hole plate of the original room and make the cast-in-place concrete slab. The two ends of the concrete beam at the bottom of the plate are supported on the steel ox leg. The steel ox leg is fixed on the original precast concrete beam by using plastic anchor bolts. side. The wall load needs to be increased on the concrete beam. For this reason, the steel legs are supported at both ends of the beam to support the concrete beam bottom. The lengthened steel ox leg is fixed to the original concrete stud with rubber anchor bolts. The use of plastic anchor bolts, the choice of plastic anchor bolts In China, the plastic anchor bolt technology is mainly used for the anchoring of equipment foundation anchor bolts, external light structure small diameter anchor bolts and adhesive steel plate auxiliary fixing, etc. Reconstruction and expansion of the main part of the structure of the force. The main advantages of the series of plastic anchor bolts developed are: the use of plastic foil packaging pipe glue, not easy to break, convenient transportation and use of anchor bolts and glue specifications, rubber use period is long, the amount is accurate; there is a special matching Gluing machine, multi-purpose, flexible use, high work efficiency; high bonding strength, fast consolidation after installation, high bearing capacity, suitable for heavy loads and various vibration loads; no crushing force on concrete, and drilling Small, less damage to the substrate, the required spacing of the anchor bolts, small margins, suitable for small spaces, this feature is particularly effective for the renovation of old buildings; can be used in humid environments; mechanical properties, fire performance, anti-aging properties All indicators are in line with international standards, have been filed and tested in China; equipped with special portable tensile strength detector; heat, acid and alkali resistant, good waterproof effect, no styrene, safe, no odor, environmentally friendly Claim;

In order to ensure the reliability of the bond strength, the on-site destructive test of the same condition is carried out, and the value is determined according to the relevant specifications. The maximum pull-out force is not less than 4*5 times the safety pull force. Under this force, the glue and the bolt, the glue and the concrete are interposed. The combination should not be destroyed (ie, pulled out or excessive relative slippage). The working conditions, the surface of the original concrete structure of the construction rubber anchor bolts were surveyed and the chiseling and repair were completed according to the adjustment plan. According to the adjustment scheme, the axis, elevation line, control line and hole center line are popped up. Support the operating platform shelf and pass the safety department inspection and acceptance. Before the formal construction, the sample (test) is made first, and the process parameters are determined. After the technical and quality departments have passed the appraisal, the operator will be given detailed technical and safety reports before starting the large-scale construction. Rainy weather or windy weather above 5 is not suitable for construction. Construction process clearing, treatment of concrete surface pop-up drilling center line to detect reinforcement position check, re-determination of hole position, drilling hole cleaning, dry glue anchor bolt operation, solidification, drawing, installation, steel plate, welding steel shank, tightening bolt, point Welding is transferred to the next process. Survey, measurement, and development plan Generally, prefabricated frame columns and beam joint concrete are cast on site, and the surface is uneven, and the section size deviation is large. Drilling directly on the surface, it is prone to quality problems such as large installation deviation of the steel plate and insufficient buried depth of the anchor bolt; at the same time, the original prefabricated frame structure and the new ones are different from the precision and tolerance of the two different structural systems from production to installation. Large (reflected at the connection point is most obvious).

According to the adjustment scheme, the concrete surface of the structural joint is subjected to necessary treatment, and the control line of the axis and the elevation is ejected, and then the center line of the anchor positioning is popped up. The steel bars in the reinforced concrete beams, columns and beam-column joints are intensively arranged. In order to avoid the main stress-reinforcing steel bars, the steel bars are used to detect the actual steel bars in the concrete at the anchor points. Auxiliary to determine the location of the final drilling point. To determine the final drilling point of the hole position, the following factors should be considered: if the main steel bar is designed at the hole position, it must be avoided. The steel bar detector can be used to find the appropriate gap between the steel bars around the hole position, and re-fix the hole position; The minimum spacing between the bolts and the margin of the anchor bolt from the outer edge of the concrete member have a great influence on the bearing capacity of the anchor bolt. Therefore, the minimum spacing and margin of the hole are also determined according to the parameter list provided by the supplier. The inner surface of the hole drilled by the impact drill is used to improve the adhesion between the concrete and the binder, but the vibration will reduce the concrete strength between the holes; the use of the interference-free diamond to form the hole is a non-destructive hole, but the hole wall The surface is smoother and it is easy to reduce the bonding property between the glue and the hole wall. Therefore, if there is no steel bar in the drilling position during construction, the impact drill can be directly drilled; if there is a stirrup to be interrupted or an unimportant steel bar that cannot be avoided, it must be approved by the designer, and the diamond is used. drilling. Regardless of the type of drill used, the drill diameter must meet the hole diameter requirements for the anchor and the glue, and the depth of the hole should be strictly controlled using the scale to avoid affecting the tensile strength of the anchor. When drilling, the drilling machine should use the supporting bracket, especially when the horizontal hole is made in the vertical plane, measures should be taken to ensure that the center line of the hole is perpendicular to the vertical plane.

Towel Rack

Towel Rack,Towel Rack Hooks,Towel Rack Heater,Towel Rack Kitchen

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