Marble dry hanging
one. Selection unreasonable
State expressly provides for construction works "lifelong responsibility" and requires dry hanging stone hanging structural adhesive must be used, use dry hanging stone construction materials should be strictly in accordance with the design drawings and in accordance with "metal and stone curtain wall engineering and technical norms" (JGJ133 -2001) requirements for implementation according to the characteristics of the stone hanging wall "hanging stone curtain wall with epoxy adhesive" (JC887-2001) specification, the provisions of the six mandatory targets for construction and decoration works of glue provisions a clear indicator of quality. Clear requirements must stone hanging stone curtain wall structure using an epoxy adhesive (AB glue). Stone hanging glue dry hanging stone curtain wall construction technology to skillfully deflected the force will be a block of tens or even hundreds of kilograms of stone bonded to the pendant, hanging plastic quality directly related to the quality and effectiveness of the installation of stone . For a long time many construction units to reduce costs in order to gain fast and convenient construction, often to replace plastic marble stone hanging plastic, poses a great security risk.

Stone hanging structural adhesive is a special glue for stone and metal bonding, which is an epoxy resin composition, the A, B used in combination with the deployment of simple, flexible part combination of anti-corrosion, high temperature resistance, aging resistance, high strength , solid and good. Under the influence of the temperature difference and vibration conditions, telescopic displacement settlement produce less and less permeability, do not pollute the stone. The gum is a marble stone for plastic, whose main component is an unsaturated resin. Mainly used for Stone and Stone and stone adhesive patches, are rigid binding. Because of their presence unsaturated bond, leading to its resistance to weathering performance than hanging plastic poor, affected the temperature is relatively large, the adhesive strength is lower than hanging plastic stone many times, and the fear of wet, not high temperature, easily weathered shear force is not enough, especially for damp walls and sunlight, shorter service life, and no security. With plastic instead of marble stone hanging plastic structure there is a big risk, which is not allowed by JC 887-2001 specification.

Many single-location construction norms expense, instead of using marble glue dry hanging structural adhesive reason except marble hanging plastic rubber prices cheaper, another important reason, marble glue fast curing time, 30 minutes It may be on the wall, and according to the characteristics of epoxy resins and curing mechanism, to achieve the best cure to form a three-dimensional cross-linked structure of the cured product, which is an extremely complex and will take some time during the reaction. Generally speaking, it may need 4-10 days to reach the best response. To solve this problem, many domestic manufacturers have started research and development in the fast curing epoxy series hanging plastic, we believe that in the near future will be able to break through this problem. But can in no way replace the marble glue dry hanging plastic epoxy, or else as many stars hanging over our heads "time bomb" in the event of "explosion", the consequences could be disastrous.

Recommended by the China Building Decoration Association Committee curtain wall engineering, Jiangsu Lippo Building Materials Industry Co., Ltd. through its own scientific and technological strength, designed, developed vigorously treasure dry hanging structural adhesive, and have their own intellectual property rights, many experts have repeatedly demonstrated through national testing and repeated verification center and verified by engineering practice, its technical performance fully meet the "hanging stone curtain wall with epoxy adhesive" (JC 887-2001) regulatory requirements. As the leading enterprise in hanging plastic, Lippo companies to build China's largest supplier of construction adhesive to the goal, has launched enhanced, universal glue dry hanging structure, with its stable quality, excellent value for money in the market has been favored by customers, and is widely used in many large-scale projects at home and abroad, such as the Foreign Ministry building, oriental pearl.

II. Improper construction methods
According to incomplete statistics, in our country engaged in building decoration industry workers has reached more than 850 million people throughout the country decoration market and businesses. Team to promote the development of architectural decoration industry has made tremendous contributions. But at the same time there is a serious concern of my colleagues in the industry to make an urgent need on the agenda of national authorities and industry associations: a large number of rural surplus labor and other industry personnel to enter reorientation decoration industry, and the majority of staff did not receive training system, uneven quality, especially in low professional quality. To improve the overall quality of the industry, to ensure project quality and safety qualified, must improve the quality of front-line workers in the operation, improve the technical quality of the construction team. This is not only a priority, but the basic work of enterprise and industry development. A business, a basis for the development of the industry, the main factor is to have a high-quality contingent of skilled workers.
Construction workers will directly affect the quality of the project Stone hanging key. The main factors affecting the stone hanging with a stirring AB Proportion, stir problem, construction and other environmental problems for the following specific description

(1) AB Proportion: currently on the market in the use of stone hanging structural adhesive commonly A: B = 1: 1. We theory and a lot of experimental results, this ratio is unscientific. The most reasonable proportion should be slightly larger than the B gums such as gum A A: B = 1.1: 0.9. Vigorously treasure dry hanging structural adhesive is based on the proportion of this production. Because once the glue epoxy curing agent B overdose can cause A plastic can not be completely cured properly, will be a sharp decline in strength after curing, while also making B glue failed to complete the reaction of small molecules that bleed easily during aging pollution Stone . Therefore, the use of personnel in the construction process must ensure that the glue is slightly larger than A B plastic.

(2) Stir problem: uneven stirring problems will seriously affect the quality of the stone hanging wall. Product quality must be built in strict accordance with construction rules and operations of the premise, uneven mixing will lead directly to the degree of crosslinking of colloid is not enough, not completely cured, intensity difference. But also the soluble small molecules seeping pollution stone. And many of today's blind pursuit of the duration of construction workers, seriously affecting the quality of construction. The following personnel to the construction of several stirring methods:
Ordinary available with plastic blade and repeatedly turned. With a small amount of glue, the stirrer available smooth fine steel, hand mixing. A large amount of glue with a stirrer and stirred by a hammer formed teeth, tooth stirring available hammer drill ends welded or Φ-shaped cross made of steel. AB hanging plastic mixing evenly unparalleled importance, the greater the hanging plastic viscosity, mixing time should be longer, are not less than 3-5 minutes. Some hanging plastic A, B component color contrast between the large, easy to stir largely determine whether or not, but should not be a reason to reduce the mixing time.

(3) Curing time problem: the previously mentioned part of the construction workers in the process of using glue marble stone curtain wall construction in. Due to construction workers marble glue dry hanging plastic usage will result in the use of errors, such as a curing agent to adjust the appropriate changes in the curing time, marble glue can be used to adjust the dose of curing curing time, some construction workers will use to dry hanging plastic use, by increasing the dosage of the curing agent, in order to achieve rapid curing purposes. So not only can not achieve the intended purpose, but due to excessive plastic dry hanging plastic B can not lead to long-term colloidal cured, weak, and even pollution Stone

(4) Construction of environmental issues: avoid construction in wet, rain, or dry stone pendant present on the surface from dust, oil and other situations. This will not only lead to poor adhesion, but also because of hanging plastic partially water soluble small molecules with rainwater leaking gas or water pollution stone.
Therefore, we hope industry associations and decoration enterprises to actively jointly organized industry experts and technical personnel of enterprises and stakeholders with the state and industry standards and enterprise advanced technology and technology jointly carry out front-line technical operations training workers for the industry norms, the development of enterprises to create dynamic, lay the foundation for the life and property safety of the people to contribute

National introduction of industry standards, "metal and stone curtain wall engineering and technical norms" (JGJ133-2001) and March 1, 2003 by the Ministry of Construction approved the implementation of national standards, "National civil engineering design measures" (first volume of this) case of the current date Edition, stone and stone hanging plastic glue uses a clear distinction, so to enable us to change the wrong use for a long time followed to ensure that the stone curtain wall engineering quality and safety, the country. Therefore, we recommend that the industry concerned should attach great importance to this, the whole industry in the field of healthy development, a seat to the people of environmental protection, health, safety, modern city.