It took less than three months to walk the grassroots in the New Year, what makes the renovation of dilapidated buildings speed up and upgrade?

Building 8, Huapichang Hutong, Xinjiekou Street, Xicheng District, Beijing, is a five-story residential building built in the 70s of the last century. Due to the imperfect supporting facilities of the building, the unreasonable spatial layout, the desertification of the wall, the settlement of the kitchen and bathroom, etc., the dilapidated building building has been rebuilt in situ with building blocks.

On the eve of the Spring Festival, the reporter walked into Building 8 of Huapichang Hutong with the District Ecological Environment Bureau, the District Housing and Urban-Rural Development Committee, and the staff of Xinjiekou Street to learn about the renovation on the spot.

"After preliminary investigation, we found that Building 8 had cracks in the walls, some components fell off, and open wires such as wires and gas pipelines hung on the outer walls of the building, and the outdoor environment was chaotic and disorderly, and the residents had a strong desire to improve the houses. Li Cong, section chief of the Xinjiekou Street Urban Management Office, introduced.

"The renovation project of Building 8 of Huapichang Hutong is based on the "Opinions on Carrying out the Pilot Work of Renovation of Dangerous Old Buildings" (hereinafter referred to as the "Pilot Opinions on Dangerous Reform") jointly issued by the Municipal Commission of Housing and Urban-Rural Development, the Municipal Planning and Self-Commission, the Municipal Development and Reform Commission, and the Municipal Finance Bureau in June 2020. The relevant person in charge of the Xicheng District Housing and Urban-Rural Development Committee said that in November of the same year, as the first dilapidated building reconstruction project in Xicheng District, Building 8 of Huapichang Hutong was included in the work plan for the reconstruction of dilapidated buildings (hereinafter referred to as the Hua8 dangerous renovation project).

"For the project, we took the initiative to communicate with the project implementation body, and gave advance guidance on the application process and required materials. The project took only 1 working day from the declaration to the date of obtaining the construction permit for the construction project. Wang Xiangnan, chief of the approval section of the Xicheng District Housing and Urban-Rural Development Committee, said.

In addition, according to Wang Yong, the head of the safety and quality supervision station of the District Housing and Urban-Rural Development Commission, special deployment meetings have been organized for many times to deploy and schedule the supervision work of the project on safety, quality, environmental protection, and construction market behavior, and a deputy stationmaster has been arranged to make special plans for specific work. Before the start of the project and during the construction process, the construction market behavior and green construction management policies and regulations should be informed and special inspections should be carried out, and the management of construction waste should be strictly implemented, and the wet operation and coverage should be strengthened to reduce dust in the whole process.

As the contractor of the Birch 8 Hazardous Reform Project, China Construction Hailong Technology Co., Ltd. adopted the concrete modular integrated building (C-MiC) + prefabricated component building system, realizing the wish of quickly turning the old house into a "good house".

According to Guo Yang, information manager of China Construction Hailong Technology Co., Ltd., the official construction of the Hua8 dangerous reform project will be at the end of October 2023. At the beginning of construction, the building was divided into 55 concrete modular units according to functional areas, and most of the processes in each modular unit, such as structure, mechanical and electrical, water supply and drainage, HVAC, and decoration, were carried out in the factory.

"90% of the work is moved to an automated workshop, which essentially improves construction efficiency, reduces material consumption, and reduces the constraints of the construction process on weather conditions, labor resources, and construction sites. In this way, not only the construction period is reduced by 80%, but also the emission of construction waste is reduced by 75%, and the loss of human resources and materials is reduced by 60%, thus achieving carbon reduction at the source. Guo Yang said.

"Based on BIM assembly coding, we can see real-time transportation information, which is convenient for accurately selecting the shortest and safest route, improving the efficiency of transportation, and ensuring that the module can arrive at the site according to the time required for construction after leaving the factory. Guo Yang told reporters that this kind of "order-making" type of smart logistics has also contributed to carbon reduction.

"In the case of a two-bedroom apartment, we would build it in advance with three modules and one balcony in three dimensions. At the same time, each material is uniformly coded through the C-SMART system, which is convenient to view the relevant information and completion progress of each material. Guo Yang introduced.

Hou Miaomiao, scientific research director of China Construction Hailong Technology Co., Ltd., said that in the construction stage, the use of BIM model and VR technology construction pre-simulation and visual disclosure can verify the feasibility of the installation sequence, improve construction efficiency, and reduce construction loss.

At the same time, Wang Yucheng, project safety director of China Construction Hailong Technology Co., Ltd., told reporters that the use of prefabricated sound insulation and noise reduction enclosures, high-frequency silent plug-in vibrators, TSP dust noise monitoring and other facilities, construction noise is reduced by 8-10 decibels, and the use of enclosure automatic sprinkler, welding fume purifier, dust net, etc., so that the construction process has achieved the purpose of noise reduction and dust reduction.

"In addition, through the C-SMART platform, we can conduct real-time visual supervision of construction environment monitoring, hydropower consumption data, and carbon emission measurement, so as to find problems in time, make quick adjustments, and effectively reduce carbon emissions in daily management and construction processes. Hou Miaomiao added.

In the operation stage, according to Wang Yucheng, passive building technology is used, such as high-performance envelope structure, three-glass double argon layer exterior windows, near-no thermal bridge node treatment, etc., to increase heat storage capacity, reduce winter heating energy consumption, and the application of solar collectors to save 47,000 kwh of domestic hot water energy, a total of 29 tons of CO per year₂Emissions.

"The whole construction process can be said to have achieved energy conservation and carbon reduction during the whole life cycle, which is equivalent to planting 5,250 trees around the building. Guo Yang said.

From moving out to capping, it took 3 months. Not only that, but also optimized the house type, added elevators, improved lighting, and improved the quality of living.

Community renovation is not only a livelihood project, but also a development project. According to Li Cong, the street staff supervised and managed the whole process of the project to ensure that it met the requirements of green environmental protection. Residents will be able to move to their new homes in the first half of this year.

Technology empowers the "small transformation" to benefit the people's livelihood, and the Birch 8 hazardous reform project has also contributed the "Xicheng experience" to urban renewal.