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According to the news released by Zhuhai, after the “July 15” flooding accident in Zhuhai, after continuous search and rescue for days, as of 12:17 on the 22nd, rescuers found and confirmed the last victim at the scene of the accident
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So far, all 14 trapped people have been found and confirmed dead
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How did the accident happen and rescue? See 3D restore! Video source: Beijing News recently, the Guangdong Provincial Department of housing and urban rural development issued an emergency notice on deeply learning the lessons of the “July 15” flooding accident in Zhuhai and further carrying out the investigation and rectification of potential safety risks of housing and municipal projects (Yue Jian Zhi Han [2021] No
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523)
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The notice points out that similar accidents in the past mainly had three problems
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In the early morning of July 15, a water seepage accident occurred in the construction section of Shijingshan tunnel of Zhuhai Xingye Express (south section) project, resulting in 14 construction workers being trapped
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The notice points out that the construction unit of the project is Zhuhai urban construction Municipal Construction Co., Ltd., the construction unit is China Railway Erju Group Co., Ltd., the supervision unit is Zhuhai Xingdi Construction Project Management Co., Ltd., the design unit is Shanghai Municipal Engineering Design and Research Institute (Group) Co., Ltd., and the survey unit is Guangdong Zhuhai Engineering Survey Institute
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It is not the first time in Guangdong that a large accident of permeable collapse has occurred in tunnel engineering
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The notice said that in recent years, there have been “2.7” flooding collapse accidents of Foshan Metro Line 2 in 2018 and “12.1” collapse accidents of Guangzhou Metro Line 11 in 2019
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From the causes of similar accidents in the past, there are mainly three problems: first, the awareness of safety risk is weak
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Not fully mastering the geological structure, forced construction under immature conditions
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During the construction process, the leakage stoppage phenomenon was used to, the safety string was not tightened, and the safe and stable construction method was not adopted
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Second, engineering supervision is a mere formality
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For the problems such as unexamined geological conditions and unreasonable construction methods, the supervision unit lacks the spirit of real action and hard work, fails to perform its duties, and is indifferent to the existing potential risks
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Third, the safety inspection did not find any problems
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The safety inspection and troubleshooting of departments and enterprises are not deep enough and lack of capacity
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The problems found are irrelevant and the major hidden dangers are ignored, resulting in repeated accidents
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Notice requirements: the notice requirements for the five party responsible main units to carry out shutdown investigation, and the relevant competent departments of all localities shall immediately organize all the five party responsible main units participating in the construction of housing and municipal projects within their jurisdiction to immediately carry out the investigation and rectification of potential safety risks
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Among them, urban rail transit projects in the whole province, municipal projects in the stage of concealed excavation such as tunnels and culverts, and projects under construction in the construction stage of divisional projects with high risks such as foundation pit engineering, formwork engineering and support system, hoisting and hoisting, installation and disassembly of hoisting machinery, scaffold engineering, or other major risk points For housing and municipal engineering projects with hazard sources, all construction operations shall be suspended for not less than three days after receiving the notice (except emergency repair, rescue operations and continuous construction operations due to production process requirements or special needs)
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The construction, survey, design, construction, supervision and other five party responsible units shall organize the self inspection of safety production conditions on the project construction site, and apply for resumption of work only after the safety production responsible person of the five party responsible unit signs and confirms that the safety production conditions are met
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In addition, the local competent departments or the safety supervision institutions entrusted by them must conduct a full coverage review of the application for resumption of work proposed by the supervised projects, carefully check and confirm that the safety hazards found in the investigation have been rectified, and the resumption of work can be approved only when the safety production conditions meet the resumption standards
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If it is found that it fails to meet the resumption standard, it shall continue to stop work for rectification
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If it is found that there are still major potential safety hazards, it shall be submitted to the issuing authority to suspend the safety production license of the construction enterprise
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In addition to being exposed in the relevant media, the Provincial Department of housing and urban rural development will also inform the engineering transaction management departments all over the province
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It is suggested that the relevant construction units should be prompted to make a careful choice for the detained enterprises for three consecutive months from the date of withholding the certificate
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The notice requires: draw inferences from one instance to strengthen the prevention ability of three types of safety risks
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The notice also points out that all relevant competent departments in all localities should deeply draw lessons from blood, draw inferences from one instance, comprehensively investigate the potential safety hazards existing in housing and municipal projects in the region, especially urban rail transit, municipal roads, municipal bridges and other tunnel projects, file and file them one by one and conduct closed-loop rectification, And take targeted measures to continuously strengthen the safety risk prevention and control of housing and municipal projects
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It includes three aspects（ 1） Strengthen geological prediction and monitoring management
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Strengthen engineering construction geological survey, geological prediction and dynamic monitoring under complex geological conditions, and urge the construction unit to entrust units with corresponding ability levels to carry out advanced geological prediction for adverse geological environment, especially the external environment of municipal tunnel project, including karst, rich water, gas and hydrogen sulfide gas, crossing coal seams, goafs or faults For tunnels in fracture zones, the geological conditions of clear water must be checked in time to strictly prevent accidents such as mud inrush and water inrush
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It is necessary to strengthen the monitoring and monitoring of key indicators, especially for underground excavation projects including tunnels and culverts, strengthen the monitoring and data collection of key indicators such as deep soil displacement and groundwater level, and timely grasp the stability of surrounding rock, support stress, deformation and other dynamic information during construction to ensure safety（ 2） Strengthen the whole process control of dangerous and large projects
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It is necessary to highlight and strengthen the whole process safety supervision of dangerous divisional and subdivisional works such as foundation pit works, formwork works and support system, hoisting and lifting machinery installation and disassembly works, scaffold works and concealed excavation works in housing and municipal works, and strictly implement the “construction scheme must be prepared before construction, and the construction scheme must be demonstrated and approved according to regulations, Technical disclosure must be carried out before construction
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The construction must be carried out according to the construction scheme during the construction process
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After the construction is completed, it must pass the acceptance before entering the next process
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In particular, for the municipal tunnel project, the key links such as excavation footage, step length, distance between secondary lining and tunnel face shall be strictly controlled, and safety patrol and hidden danger investigation and treatment shall be strengthened, Ensure construction safety（ 3） Strengthen and improve emergency rescue capacity
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Establish and improve the construction emergency plan, strengthen the reserve of construction emergency materials and equipment, and carry out emergency rescue drills in strict accordance with the regulations to ensure rapid response, efficient disposal and effective rescue after the accident
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Especially for municipal tunnel projects, it is necessary to urge the construction unit to establish and improve the automatic identification and positioning system for personnel in the tunnel, master the number and distribution of personnel in the tunnel, strengthen personnel safety education and training, and improve the ability of tunnel construction personnel to identify major safety risks, especially emergency evacuation and self rescue
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