【 Building materials network 】Recently, the Highway Tunnel Porcelain Plate Co., Ltd. jointly submitted by the Highway Planning, Survey, Design and Research Institute of Sichuan Provincial Department of Transport and Sichuan Huatai Kechuang Building Materials Co., Ltd keel The application for the preparation of the Technical Specification for Dry Hanging Decoration was reviewed and approved by China Engineering Construction Standardization Society (CECS), and entered the publicity stage.

The tunnel is a permanent underground building. Due to the restrictions of relatively dark lighting, relatively high humidity, relatively serious air pollution and other factors in the tunnel, the interior decoration of the tunnel must be strictly required from the use effect, construction cost, construction difficulty, post maintenance and other aspects.

As an innovative tunnel decoration technology, the porcelain plate dragon free backbone hanging decoration technology of highway tunnel is supported by the tunnel secondary lining concrete structure, and uses special metal Pendant The pretreated porcelain plate is firmly suspended on the inner surface of the lining, playing a decorative role on the inner wall of the tunnel, and has good adaptability and economy.

It is understood that this technology can be widely used in highway tunnel decoration, subway high-speed railway stations PC Component assembly building, urban underground space construction and satisfaction foundation wall Interior and exterior decoration of buildings as required. At present, this technology has been successfully applied in G213 Wuzhishan Tunnel and Yakang Expressway Zhougongshan Tunnel.

Three Technical Highlights Solve the Problem of Traditional Highway Tunnel Decoration

With the gradual expansion of the construction scale of high-grade highway tunnel projects in China, the tunnel interior decoration has gradually developed from the original single concrete to the direction of functionalization, diversification and humanization, and a variety of decoration schemes have emerged. Up to now, it mainly includes the following categories: concrete Fire retardant coating , porcelain plate, artificial board Composite materials Aluminum plate And enamel steel plate Etc.

At present, porcelain plate is widely used in China with better cost performance.

However, there are also some problems in the traditional porcelain plate decoration of highway tunnels: for example, the porcelain plate is small in size, and there is no sense of integrity after decoration in the high-speed driving environment, and the decoration effect is poor; Most of the porcelain plates are wet pasted, which is easy to fall off. However, the traditional dry hanging requires the installation of keels, which not only occupies large space, but also has high construction costs, and is also not suitable for promotion in the decoration of highway tunnels.

Therefore, in the actual use of porcelain plates, innovative technologies are also urgently needed to provide better solutions.

However, the technology of keel free dry hanging porcelain plate came into being, which perfectly solved the above problems.

It is understood that the dragon free backbone hanging decoration technology of highway tunnel porcelain plate is one of the achievements of Sichuan transportation scientific research projects, which is jointly developed by the Highway Planning, Survey, Design and Research Institute of Sichuan Provincial Department of Transport and Sichuan Huatai Kechuang Building Materials Co., Ltd. The subject mainly aims at many problems existing in the existing tunnel sidewall decoration, and draws on the concept of building assembly, boldly conceives, researches and improves the existing keel free dry hanging technology, and successfully develops this new highway tunnel sidewall decoration technology.

This technology not only comprehensively solves many problems existing in traditional highway tunnel decoration, but also forms three unprecedented highlights:

First, the service life is very long. Due to the use of porcelain plates for dry hanging and the pretreatment technology of porcelain plates, the dry hanging conditions of porcelain plates are solved, the explosion-proof requirements of porcelain plates are realized, and the "once and for all" of tunnel decoration is realized. Compared with traditional wet paste Porcelain And also significantly reduced the annual construction cost.

Secondly, the decoration effect is "high, large and superior". Reference of porcelain plate dragon free backbone hanging decoration technology curtain The decoration concept adopts the dry hanging of large-sized porcelain plates and exquisite gap treatment technology, so that the tunnel decoration effect is high-end, grand and high-grade, and the decoration effect reaches the domestic first-class level.

Thirdly, it is convenient for maintenance and replacement. The connection technology of "S pendant+K type combined pendant" in the porcelain plate dragon free backbone hanging decoration technology has realized the independent removal and installation of veneer from the decoration front, which can quickly realize the removal and replacement of veneer and traceless maintenance. It has solved the problem of difficult decoration and maintenance of expressway tunnels, thus ensuring that the tunnel decoration always maintains beautiful decoration effect during its life.

In addition, the porcelain plate of the highway tunnel is decorated without dragon backbone hanging, and the transverse and longitudinal joints of the plate joints are all hollowed out. The gap is not only clean and beautiful, convenient for maintenance and replacement, and can effectively reduce the fatigue damage caused by negative pressure to the pendant, but also has certain energy-saving and noise reduction functions.

Full life cycle, ultra-high comprehensive cost performance advantages are obvious

For highway tunnel decoration technology, high cost performance is also the management department door Common pursuit with the construction unit.

To evaluate the cost performance of highway tunnel decoration technology, we should first know what kind of performance requirements are needed for highway tunnel decoration. Highway tunnel is a permanent underground project. From the perspective of use managers, two more performance requirements are needed: one is long enough service life, and the other is to maintain beautiful decoration effect for a long time.

However, the porcelain plate dragon free backbone hanging decoration technology in highway tunnels has an extremely high cost performance in terms of service life and comprehensive operation and maintenance costs.

First, it has an ultra-high effective service life. Because the porcelain plate dragon free backbone hanging decoration technology has the characteristics of easy disassembly and assembly, it can be disassembled during lining maintenance and reinstalled after maintenance, thus avoiding such damage, so its effective service life can be fully guaranteed.

The porcelain plate dragon free backbone hanging has an extremely long service life. Although its initial installation cost is slightly higher than the traditional wet pasting method, the original installation will not be damaged during the maintenance of the tunnel structure Veneer Therefore, only labor and a small amount of auxiliary material costs need to be paid to effectively reduce the comprehensive cost of the whole life cycle. And this cost advantage will become more and more obvious with the growth of time. It is a tunnel decoration technology with higher cost performance ratio at present.

At present, the service life of traditional road decoration materials is often affected by external factors. According to statistics, due to geological factors, highway tunnels need to be fully maintained every 10 years on average. The service life of some tunnel decoration materials may be very long, but because these materials are completely attached to the tunnel lining, they will inevitably be damaged when the tunnel structure is maintained, so their service life cannot be guaranteed.

Secondly, the operation and maintenance cost of tunnel decoration is an important indicator to measure the cost performance of highway tunnel decoration technology. Operation and maintenance costs mainly include lighting costs, cleaning costs and maintenance costs.

In terms of lighting, the reflectance of customized panels used for porcelain plate dragon free backbone hanging decoration is not less than 0.7, and the diffuse reflection formed can really enhance the lighting effect in the tunnel. According to JTGTD70/2-01, the decorative panels with a reflectance of 0.7 can increase the tunnel illumination by 10%, thus improving the illumination, Meet the tunnel lighting design requirements while reducing the cost of lighting power.

In terms of cleaning and maintenance, the current tunnel decoration basically adopts the manual cleaning mode, which generally has the problems of low efficiency and high cost. The porcelain plate dragon free backbone hanging decoration technology meets the requirements of mechanized cleaning operation, which not only greatly reduces the cost of tunnel cleaning, but also reduces the potential safety hazards of manual cleaning operation.

In terms of maintenance, the road tunnel decoration is more different from other architectural decoration in that it is frequently damaged, and maintenance is a difficult problem. If this problem cannot be solved, it is impossible to ensure that the road tunnel always maintains beautiful decoration effect.

Porcelain panel dragon free backbone hanging decoration technology uses combined pendant connection to realize the rapid removal and replacement of decorative porcelain panels. Daily maintenance personnel can complete the removal and replacement of single panels within 2 minutes. At the same time, through the selection and reasonable deployment of porcelain plates, traceless maintenance can be achieved, and the impact of maintenance traces on the tunnel decoration effect can be eliminated, so as to ensure that the tunnel always maintains beautiful decoration effect.

It can be said that the porcelain plate dragon free backbone hanging contributes more to the tunnel decoration, which is a good solution to the maintenance of tunnel decoration.

In June 2018, at the topic conclusion review meeting organized by the Sichuan Provincial Department of Transport, the expert group gave high praise to the dragon free backbone hanging decoration technology of highway tunnel porcelain plate: "Its decoration effect and comprehensive economic benefits are better than the existing tunnel decoration, which is innovative, practical and operable, and has broad prospects for promotion and application."

In addition, the expert group made an exception and proposed that "local and industrial standards should be formulated as soon as possible based on the research results". Because of this, in order to rapidly promote this technology in the national transportation industry, in August this year, Sichuan Provincial Transportation Department Highway Planning, Survey, Design and Research Institute and Sichuan Huatai Kechuang Building Materials Co., Ltd. submitted an application to China Association for Engineering Construction Standardization for the preparation of the above standards.

Because the dragon free backbone hanging decoration technology of highway tunnel porcelain plate not only has super technical advantages, but also has a high comprehensive cost performance ratio. Some experts predict that the porcelain plate dragon free backbone hanging may become the mainstream technology for the side wall decoration of highway tunnels in the future.