The back-bolted keel-free porcelain plate dry-hanging technology is quoted from Germany Seelbach company's products and the professional technology of exterior decoration system materials for producing various patented accessories. In recent two years, it has been applied in large-scale projects, such as Suzhou Nandu Linglongwan Garden (Phase I and Phase II), Suzhou Industrial Park Jinshu International Apartment (Phase I, Phase II and Phase III), Nanjing Langshi International Block Phase I and other projects. This technology has passed the appraisal of scientific and technological achievements in Jiangsu Province.
introduction of the back-bolted dry-hanging anchorage system for boneless porcelain plates
The back-bolted dry-hanging anchorage system for boneless porcelain plates applies the principles of chemical bonding (rebar planting) and back-bolting, and develops a new technology without keel.
Based on the back bolt anchoring principle, the anchor bolt is developed. After being embedded in the veneer, the bolt is screwed in, and the bottom is expanded, which coincides with the expanding hole of the special drill on the back of the veneer, forming a stress-free fastening mode.
in the traditional technology, the expansion bolt can only be used in the compression area of concrete, but not in the cracking area. It is difficult to determine whether the facade of the building surface is a compression area or a cracking area, which is limited in construction. Generally, it is not suitable for permanent buildings (structures). If the expansion bolt is not made of stainless steel for a long time, it may corrode, leading to the expansion bolt loosening or even falling off. The friction expansion anchor bolt is not safe and easy to loosen under repeated wind. There are also embedded parts in concrete. The disadvantage of embedded parts is that it is troublesome, and the deviation of design position is required to be within ±1mm, so it is difficult. However, rebar planting is to bond rebar and concrete with structural adhesive, and form a full-length anchor body with surface-to-surface contact by using the adhesive force of the adhesive, which has no extrusion pressure on the base material and can be used in the cracking area of concrete.
chemical anchor bolt is composed of chemical agent (resin anchoring agent) and metal rod. Large drawing force, anti-vibration, anti-fatigue, non-shrinkage, anti-aging, fast bearing, simple installation and low cost, is a common connection method with the base surface of concrete wall.
I. chemical bonding principle (rebar planting principle): after drilling and cleaning the base material, fill the hole with chemical adhesive, and then insert the anchor bolt for bonding and anchoring. It is an anchoring method that makes the anchor bolt bond with the material through chemical coagulant. The performance of anchorage is closely related to the anti-aging, shrinkage and fire resistance of chemical products.
ii. back-bolt principle: the back-bolt-type keel-hanging anchoring technology refers to drilling a conical hole in the material through special equipment and a drill bit, so that when the anchor bolt is implanted, the shape of the bottom of the anchor bolt after opening is consistent with the shape of the drilled hole, and through convex combination, the structure is locked and stress-free anchoring is carried out. This kind of anchor bolt is also called stress-free anchoring.
characteristics of back-bolt anchor system without dragon backbone
A-shaped and L-shaped inserting rods are connected with the wall by planting reinforcement, and also play a role in strengthening the insulation layer. B, the unique self-checking function of the back-bolt anchor bolt can be applied to thin veneer plates at the same time, which also reduces the load of the wall.
C, the traditional keel frame modeling is avoided, the cost is greatly reduced, and the construction speed is also 2-3 times of the traditional one.
D, the system structure is concise, the decorative panel can be disassembled and replaced, and the maintenance cost is low.
E, using the principle of rain curtain: "multi-cavity decompression, isobaric waterproofing, decompression and degassing". It has the function of ventilation, heat insulation, sound insulation, energy saving and environmental protection. Experts pointed out: the horizontal joint is open-5.1% enters the ventilation cavity, and only .3% of rainwater reaches the insulation layer; All joints are open-16.6% enters the ventilation cavity, and only .4% of rainwater reaches the insulation layer; System drying time-24 hours with wind and occasional light.
characteristics of dry hanging series of back-bolted keel-free porcelain plates
a) optimizing the building facade and fully expressing the architect's design intention
ⅰ. There is no visible supporting structure between the plates;
ⅱ can freely choose the anchor bolt position on the back of the plate;
node ⅲ is flexible and can fully show the detailed structure of the building;
Ⅳ the plate can be changed frequently according to the design requirements.
b) The structural system is optimized, which has higher bearing capacity
Ⅰ. The deadweight of curtain wall is light, and the deadweight of board per square meter is 25 kg ~ 29 kg;
the force transfer of system ⅱ is simple and clear, and there is no uncertain stress concentration caused by interconnection;
ⅲ has several times of tensile strength compared with the system with fixed plate edges;
Ⅳ plate is subjected to smaller bending distance; Higher security;
ⅴ fully reflects the design intent of flexible structure and has good seismic performance.
c) It is frost-resistant and acid-resistant, and will not be cracked and tarnished by frost in harsh atmospheric environment, and will not fade after long-term ultraviolet irradiation, and will always keep its original color.
d) The installation and construction are highly prefabricated, which can shorten the construction time and reduce the construction intensity.