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Research and development of software for safety and quality supervision in construction projects: In order to strengthen and improve oversight at construction sites, our agency was the first in the province to develop a software system for construction project supervision in 2000. In the initial stages of development, remote monitoring relied on a \"point-to-point\" video transmission method, which involved running an optical cable directly from the cameras installed at the construction site to the monitoring center. Thanks to the point-to-point transmission method, there was no interference in the bandwidth, resulting in relatively clear and stable images, as well as fast transmission of both upstream and downstream signals. This “point-to-point” video transmission method is suitable for fixed locations, but it has significant limitations in construction sites. Construction sites are quite scattered; some are seven or eight kilometers away from the monitoring center, while others are dozens of kilometers away. Along the way, bridges and roads must be passed through, and the optical cables used for transmission not only need to be installed on elevated structures but also sometimes require digging through roads or passing through underground pipelines. Therefore, when installing the optical cables for remote monitoring transmission, coordination with relevant parties is often required, which increases the difficulty and cost of transmission; as a result, the adoption and expansion of remote monitoring systems came to a standstill for a time. To address the aforementioned issues, we adopted the following countermeasures in our development efforts: First, to ensure that images of high clarity are transmitted from the cameras on the tower cranes, we started by considering the location at the front end of the construction site, and designed the setup in such a way as to shorten the distance between the cameras on the cranes and the main unit, keeping it within 300 meters as much as possible. We also amplified the signals appropriately and ensured that the transmission lines had good shielding to reduce mutual interference ； On the other hand, it is to improve frame-preserving techniques for compressed video, ensuring that the computer system operates stably and properly even when running continuously for 24 hours. Next is to develop a remote monitoring transmission method suitable for the characteristics of construction sites in order to reduce transmission costs. Through comparison and screening, we successively tried ISDN transmission, wireless microwave transmission, and metropolitan area network transmission, but all of them were discarded due to high transmission costs and poor image quality. This year, while improving the operating software for image systems and the device configurations, we have utilized broadband and wireless broadband networks for direct online transmission, which has significantly reduced transmission costs. What used to cost tens of thousands of yuan per year now only costs a few hundred yuan per year, creating favorable conditions for the widespread adoption of remote monitoring. Third, and most importantly, it is necessary to develop image system operation software with stable performance and comprehensive functions, in order to ensure the quality of remote image transmission as well as the effectiveness of operational control. At present, the system software we have developed enables high-definition video recording, with approximately 350M of data recorded per hour; the playback quality is excellent, almost identical to that of the live surveillance view ； Each sub-control terminal can receive audio and video signals from the main control unit at the front end simultaneously, and it can be expanded indefinitely, thereby truly achieving the goal of remote centralized monitoring ； Furthermore, the system software features highly intelligent network transmission capabilities, reducing the requirements for bandwidth; there is no longer a need for a dedicated fixed IP address. As long as there is broadband of 512k or higher, it is possible to transmit images over the network, and the transmitted images are free of mosaic effects, allowing even the smallest steel rebar to be seen clearly ； The system software boasts advanced and sophisticated features such as alarm interconnection, electronic maps, voice broadcast communication, the ability to view local and remote operation logs, video editing during playback, frame previewing and playback, data backup, and disc burning, all of which make data management much easier and provide a reliable technical foundation for implementing remote monitoring in construction projects. The application of remote monitoring systems in the safety and quality supervision of construction projects. The initial purpose of developing remote monitoring software systems was to improve and strengthen the supervision of safety and quality in construction projects. Since its development in 2000, this system has been put into practical use. Through years of continuous experimentation and improvement, it has become increasingly mature. In actual applications, it has demonstrated its scientific validity, practicality, effectiveness, and high efficiency. For any construction site that is under surveillance, the staff in the control room can employ different monitoring methods depending on the various construction phases at each site, thereby enabling effective oversight of multiple construction sites. 1) Monitoring during the foundation stage. Since the 1980s, there has been an increasing number of high-rise buildings in Xiamen. The issues related to safety and quality in the construction of deep foundations have become increasingly prominent; in particular, tasks such as deep foundation pit support, trench excavation, and manual hole-digging for piles have been included in the scope of specialized management efforts. Therefore, construction at this stage has been made a focus of monitoring. In view of the characteristics of construction at this stage, the remote monitoring system focuses on safety measures and quality control; the main aspects of monitoring at present are listed in the table below: 2) Monitoring during the ground and floor construction phases. Entering the phase of ground and floor construction, the building is open on all sides, providing a large working area with many workers; various construction tasks are often carried out simultaneously, which requires that all safety precautions and quality standards be carefully considered. To this end, the software system has established various key monitoring points; currently, the main areas under monitoring include: slot inspection, concrete delivery, pouring and tamping, curing, formwork installation (deformation of formwork supports in cases of \"two excesses and one large scale\"), rebar installation and binding, concrete pouring, proper use of safety helmets and belts by construction workers, installation of safety nets on buildings, as well as protection measures at stairways, elevator entrances, shaft openings, pre-existing openings, pit openings, balconies, floor slabs, rooftops, and other similar locations – totaling 12 main categories and 22 subcategories. The monitoring time, content, standards, and methods can all be set through the software system according to the needs of the staff (they can be displayed in a list as in the previous section; omitted here, and the same applies elsewhere). 3) Monitoring of work at heights. Designed with the characteristics of high-altitude work in mind, the remote monitoring software system has established various key monitoring aspects. Currently, there are 11 main categories and 23 sub-items, including the installation of safety nets on buildings, protection measures for workers at heights, proper use of safety helmets by workers, the erection of external scaffolding and bamboo scaffolding, the fixing and use of wind ropes, the installation and use of suspension baskets, protection for the feeding openings of suspension baskets and the loading platforms on floors, as well as the installation and operation of tower cranes and winches. 4) To enhance the management of civilized construction at construction sites, the remote monitoring software system currently includes specific monitoring criteria for such civilized construction practices. These criteria cover 7 main categories and 19 sub-items, including site fencing, storage of building materials, temporary facilities at the site, fire prevention, theft prevention, and the installation of construction signs – all aimed at improving safety management. The great significance of remote monitoring in construction projects: The software system for remote monitoring of construction project safety and quality integrates modern high-tech technologies such as computer networks and communication technologies, video digital compression techniques, and decision support systems, and it plays an important role in enhancing and improving the safety and quality management of construction projects. 1) Make effective use of modern scientific and technological achievements to innovate the supervision model for construction projects. By applying remote monitoring software systems for construction projects, the working approach of construction administration departments has gradually shifted from traditional on-site supervision to remote video monitoring ； Through the Internet, mobile supervision can be carried out very conveniently; that is, supervisors can, from anywhere in the country, monitor construction projects under management by connecting to the Internet. This enables remote monitoring of the safety and quality of such projects at any time (24/7) and in any location where Internet access is available across the country, thereby enhancing the scientific nature, effectiveness, and efficiency of oversight of construction projects. In the past, to inspect and supervise construction projects, it was necessary to rely on professionals who would go to the construction sites in person. However, there were often too few such professionals compared to the number of sites, resulting in inadequate supervision, incomplete information, or delayed responses. This led to gaps and blind spots in the oversight of the safety and quality of construction projects. With the implementation of remote monitoring software systems, automatic image recognition and monitoring alerts are enabled, effectively acting as an \"electronic police force\" for construction sites. Monitoring personnel in charge of construction safety and quality gain the ability to see what’s happening at the construction site at any time, allowing them to identify problems promptly and urge the construction teams to address potential hazards right away, thereby promoting safe production and improving the quality of the work. 2) Encourage all parties involved in the construction market to strengthen safety and quality management in construction projects. Since the development of the remote monitoring software system for construction projects in Xiamen, its scientific nature and effectiveness have had a positive impact on various parties involved in construction; owners (construction entities, developers), supervision agencies, construction companies, and insurance firms have all begun to emulate and adopt it. Xiamen Xinhjiangnan Development Co., Ltd. and Xiamen Real Estate Co., Ltd., in order to ensure the safety and quality of the construction (construction-on-behalf) projects, have each invested in installing remote monitoring facilities on their own, assigned dedicated personnel to monitor the entire construction process, and urged the construction units to prioritize safety and quality. Xiamen Gaoxincheng Construction Supervision Co., Ltd. installed remote monitoring in 3 construction projects at once, thereby strengthening supervision efforts. Zhejiang Badar Construction Group Company, which is carrying out construction projects in Xiamen, has installed remote monitoring systems on its two major projects to monitor the construction teams and workers, thereby enhancing the quality and safety management of those construction projects. Since the end of last year, Xiamen China Life Insurance Company and Tianan Insurance Company have installed remote monitoring systems in the construction projects they insure, with the aim of preventing and reducing accidents related to those projects as well as lowering the claims ratio. This helps the management agencies, supervision units, and construction companies to enhance and improve the safety and quality control of the insured projects. In Xiamen, a favorable situation has emerged in which various construction entities compete to utilize remote monitoring technologies for construction projects, thereby enhancing safety and quality management. 3) Strengthened security management at construction sites to promote social stability and harmony. As is well known, all facilities at construction sites are temporary; once the construction project is put into use, these temporary structures are removed. For this reason, the facilities at construction sites are always quite simple ； On the other hand, construction workers are hired as needed, depending on the progress of the project and the amount of work involved; this gives it a clear seasonal, fluid, and temporary character, which makes it difficult to manage construction sites. Construction equipment and building materials at construction sites are stolen, and it is common for criminals to take advantage of construction sites to commit crimes. This not only causes financial losses to businesses but also adds a source of instability to communities. After remote monitoring facilities are installed at a construction site, electronic sensors provide round-the-clock surveillance of the site, recording in detail every event that takes place there as well as the movements of anyone outside. Monitoring personnel can review the recordings as needed, and in the event of theft or criminal activity at the site, everything can be clearly seen from the videos. Therefore, at all construction sites that are now equipped with remote monitoring systems, not only are the construction equipment and materials not lost, nor do criminals have any place to take advantage of such facilities; even those who intend to cause trouble dare not enter the sites (for fear of being filmed as evidence). The security at these construction sites has improved significantly, and this improvement in security contributes to greater stability and harmony in the community. Conclusion: As a relatively scientific and effective method for project supervision, remote monitoring software systems for construction projects are increasingly gaining attention and favor from relevant departments and all parties involved in construction. Especially during the construction phases of the foundation and main structure of a building, the effectiveness and credibility of such monitoring are beyond doubt. However, remote monitoring also has its limitations; once the main structural construction of a building is completed, the surveillance cameras installed on tower cranes can no longer monitor what is happening beneath the floor slabs, including interior and exterior decoration work, masonry tasks, and plumbing and electrical installations. These aspects need to be improved and enhanced through future research and development.