Study On Risk Assessment Of Potential Defects Of Basement Waterproof Engineering Quality From The Perspective Of Technical Inspection Service

In recent years,engineering leakage problems occur frequently.There is a lag in the exposure of quality defects of basement waterproof engineering.Once leakage occurs,it is difficult to repair later.To control the quality of basement waterproof engineering is a key link to ensure the function and durability of construction engineering.In order to control engineering quality risk effectively,our country introduces Inherent Defects Insurance(IDI),while Technical Inspection Service(TIS)which provides technical service for IDI has not formed the risk assessment standard aiming at the basement waterproof engineering quality,the risk management work of TIS is still in the exploration stage,the classification of risk levels is subjective and lacks scientific and effective evaluation index system and evaluation method.Therefore,it is necessary to analyze and evaluate the inherent defect risk of basement waterproof engineering.Firstly,this paper investigates and summarizes the research progress and achievements of basement waterproofing engineering,TIS and risk assessment methods at home and abroad,and defines the concepts of inherent defects in the quality of basement waterproofing engineering and TIS.Theoretical support for subsequent research is provided through the elaboration of risk management theory,cloud model theory and fuzzy comprehensive evaluation theory.Secondly,based on literatures,industry standards and specifications,and the work content of TIS,the author identifies risk indicators in accordance with the four stages of survey and design,construction,completion acceptance and operation and maintenance,and initially constructed a list of risk factors of inherent defects in the quality of basement waterproof engineering from the perspective of TIS.Based on the questionnaire survey results,the membership analysis method was used to screen the risk factors,and then the risk factors were investigated by experts.According to the expert opinions,the risk factors were supplemented and optimized,and the inherent defect risk index system of basement waterproof engineering quality was finally determined,which included 4 first-level indicators,16 second-level indicators and 64 third-level indicators.Then,Ordered Weighted Averaging Method,Entropy Weight Method,and Improved CRITIC Method are selected as three weighting methods.Based on game theory,a total of five weight methods are formed by combining the three methods in pairs,and the number of indicators are deleted successively to judge the influence of different weighting methods on the evaluation results of the same indicator system.The number of indicators is deleted successively to judge the influence of different weighting methods on the evaluation results of the same index system.Finally,OWA-EWM combination game weighting method is used to determine the weight of the inherent defects risk index of basement waterproof engineering quality.The cloud model is used to construct the quallity inherent defect risk evaluation model of basement waterproof engineering,and the classical fuzzy comprehensive evaluation model is used to compare and verify the evaluation results of the cloud model.Finally,the basement waterproof engineering of a residential community in Jiangsu province is taken as a research example,and personnel from TIS are invited to carry out risk assessment on the project according to the evaluation index system.It is obtained that the cloud model level of inherent defect risk of the basement waterproof project of the community is "slight risk",among which the cloud model level of the waterproof project in the investigation and design stage is"slight risk",the cloud model level of the construction stage is "general risk",the cloud model level of the completion and acceptance stage is "slight risk",and the cloud model level of the operation and maintenance stage is "slight risk".The above results are consistent with the actual situation.The staff of TIS put forward risk improvement suggestions according to the risk evaluation results at each stage.The evaluation results of cloud model and fuzzy comprehensive evaluation model are in good agreement,which verifies the feasibility of the evaluation method and cloud model selected in this paper.This study not only enriches the theoretical achievements of risk assessment and management research on inherent defects of basement waterproof engineering quality,but also provided a scientific and reliable quantitative assessment tool for TIS for basement waterproof engineering,and issued a more accurate risk assessment report,and also provided technical guarantee for the development of IDI in China.