Foreword
In order to adapt to the international technical regulations and the prevailing rules of technical standards, since 2016, the Ministry of Housing and Urban Rural Development has successively issued the Opinions on Deepening the Reform of Engineering Construction Standardization and other documents, proposing the long-term goal of the government to develop mandatory standards and social organizations to develop voluntary standards, and defining the reform task of gradually replacing the scattered mandatory provisions in the current standards with full text mandatory engineering construction specifications, Gradually form a "technical regulation" system consisting of technical provisions in laws, administrative regulations, departmental rules and full text mandatory project construction specifications.
About the types of specifications. The mandatory engineering construction specification system covers all kinds of construction projects in the engineering construction field, which is divided into two types: engineering project specifications (project specifications for short) and general technical specifications (general specifications for short). The project specification takes the overall engineering construction project as the object, and takes the project's scale, layout, function, performance and key technical measures as the main content. The general specification takes the general technology of all disciplines to meet the functional performance requirements of the engineering construction project as the object, and takes the general technical requirements of survey, design, construction, maintenance, maintenance, etc. as the main content. In the full text of the mandatory project construction specification system, the project specification is the backbone, and the general specification is the provision of common and common professional key technical measures for various projects.
About the five major factor indicators. The elements in the mandatory project construction specifications are the basic provisions to ensure the systematization and efficiency improvement of urban and rural infrastructure construction, and the basic requirements to support the high-quality development of urban and rural construction. The scale requirements of the project mainly stipulate that the construction project should have a complete production or service capacity, and should adapt to the level of economic and social development. The layout requirements of the project mainly specify the industrial layout, construction project site selection, overall design, general layout and overall technical requirements in coordination with the scale. The reasonable distribution of supply capacity should be considered to improve the overall level of related facilities construction. The functional requirements of the project mainly specify the composition and purpose of the project, and define the basic constituent units of the project, which is the guarantee for the project to play its expected role. The performance requirements of the project mainly specify the construction level or technical level of the construction project, reflect the applicability of the construction project, and specify the basic level of project quality, safety, energy conservation, environmental protection, livable environment and sustainable development. The key technical measures are the basic technical provisions for realizing the functional and performance requirements of the construction project, and the basic guarantee for implementing the development goals of urban and rural construction, such as safety, green, resilience, wisdom, livability, fairness and efficiency.
About the implementation of specifications. Compulsory project construction specifications have mandatory binding force and are intended to safeguard the safety of people's lives and property, human health, project safety, ecological environment safety, public rights and interests, as well as promote the conservation and utilization of energy resources, meet the regulatory baseline requirements in economic and social management, etc. The survey, design, construction, acceptance, maintenance, maintenance, demolition and other construction activities of engineering construction projects must be strictly implemented throughout the whole process, Among them, for the existing building reconstruction project (referring to not changing the existing use function), when the conditions are not available and it is really difficult to implement the current specifications, it should not be lower than the original construction standards. The recommended engineering construction standards supporting the mandatory engineering construction specifications are mature technical measures that have been tested in practice to ensure that the requirements of the mandatory specifications are met, and should also be implemented in general. On the premise of meeting the project function, performance requirements and key technical measures specified in the mandatory project construction specifications, relevant group standards and enterprise standards can be reasonably selected to optimize or reach a higher level of project function and performance. Recommended engineering construction standards, group standards and enterprise standards shall be coordinated with the mandatory engineering construction specifications, and the technical requirements shall not be lower than the relevant technical level of the mandatory engineering construction specifications.
After the implementation of the mandatory engineering construction specifications, the mandatory provisions in the current relevant national standards and industrial standards for engineering construction shall be abolished at the same time. The mandatory provisions in the current local standards for engineering construction shall be revised in a timely manner and shall not be lower than the provisions of the mandatory engineering construction specifications. If the relevant provisions in the current project construction standards (including mandatory standards and recommended standards) are inconsistent with the provisions of the mandatory project construction specifications, the provisions of the mandatory project construction specifications shall prevail.
1 General
1.0.1 This Code is formulated to promote the construction of ecological civilization and sustainable development, implement the concept of sponge city construction, improve the water environment, ensure drainage safety, and promote the use of water resources.
1.0.2 Urban and rural drainage works must comply with this specification.
1.0.3 The planning, construction and operation of drainage works shall follow the following principles:
1 Make overall plans for the ecological environment treatment and urban and rural construction of the regional watershed, protect and repair the natural accumulation, natural infiltration and natural purification capacity of the ecological environment, reasonably control the intensity of urban development, meet the requirements of the blue line and water surface ratio, and achieve effective collection and treatment of domestic sewage and safe treatment and disposal of sewage sludge;
2 Make overall plans for water resource utilization, disaster prevention and mitigation, improve the ability of cities and towns to infiltrate, stagnate and store rainwater, make full use of recycled water, and strengthen the storage and utilization of rainwater;
3 Make overall plans for flood control and urban drainage and waterlogging prevention, improve the construction level of urban rainwater system, and strengthen the system connection between urban drainage and waterlogging prevention and river basin flood control.
1.0.4 Scientific and technological research shall be strengthened for drainage works, and new technologies, new processes, new materials and new equipment verified by practice and with technical and economic advantages shall be preferentially used to improve the collection and treatment efficiency of drainage works and the level of waterlogging prevention, promote resource recycling, improve scientific management and intelligent level, and achieve energy conservation and consumption reduction throughout the life cycle.
1.0.5 Whether the technical methods and measures adopted in the project construction meet the requirements of this specification shall be determined by the relevant responsible subject. Among them, innovative technical methods and measures shall be demonstrated and conform to relevant performance requirements in this specification.
2 Basic regulations
2.1 Scale and layout
2.1.1 The professional planning related to drainage engineering shall be prepared and updated regularly according to the drainage safety and water environment objectives based on the assessment of the current situation of the system, combined with the urban and rural development trend; It should also be connected with the planning of water resources, water supply, water system, flood control, special planning of sponge city construction, and other professional planning such as urban vertical, road traffic, garden and green space, underground space, pipeline integration, disaster prevention, etc.
2.1.2 Except for arid areas, the drainage system of newly built areas shall adopt the separate flow system.
2.1.3 For the existing combined drainage system, the construction cost, implementation feasibility and project benefits shall be comprehensively considered, and the rainwater and sewage diversion transformation shall be implemented after technical and economic comparison; If the reconstruction conditions are not met temporarily, the overflow pollution control target shall be determined according to the water quality target of the receiving water body and the water environment capacity, and comprehensive measures shall be taken to control the overflow pollution.
2.1.4 Drainage works shall include rainwater system and sewage system.
2.1.5 The layout of urban rainwater system shall meet the following requirements:
1 The principle of combination of green, blue and grey and combination of storage and discharge shall be adhered to;
2 It shall be determined in combination with urban flood control, surrounding ecological security pattern, urban vertical, blue green space and land use layout;
3 Rainwater drainage safety, construction and operation costs, runoff pollution control and urban water ecological requirements shall be comprehensively considered.
2.1.6 The construction scale of urban rainwater system shall meet the requirements of the total annual runoff control rate, the design return period of rainwater pipes and canals and the design return period of waterlogging prevention, and shall be checked as a whole.
2.1.7 The layout of urban sewage system shall meet the following requirements:
1. The principle of combining centralization with distribution should be adhered to;
2 It shall be determined in combination with the vertical and land use layout of the town and the setting conditions of the discharge outlet
2.2 Construction requirements
2.2.1 The construction and operation of drainage works shall meet the requirements of ecological safety, environmental safety, resource utilization safety, production safety and occupational health and safety.
2.2.2 The site selection of drainage engineering facilities shall take into account the geological and topographic conditions, and shall comply with the relevant planning of drainage engineering and special planning for disaster prevention.
2.2.3 Drainage design scheme shall be prepared for various construction projects to assess the impact of the project on local waterlogging prevention and sewage collection, which shall not exceed the design load of existing rainwater system and sewage system.
2.2.4 Rail transit, underground space, roads and other construction projects shall not affect the function, storage and drainage capacity and safe operation of existing drainage facilities.
2.2.5 Separate drainage system shall be provided with rainwater pipe and sewage pipe respectively, and shall not be connected in a mixed way or by mistake; The combined drainage system shall define the service scope and set up combined sewage pipes to receive rainwater and sewage within the service scope.
2.2.6 The rainwater system shall implement the concept of sponge city construction, and give priority to the use of source emission reduction facilities to reduce rainwater runoff and pollutants. According to the water environment capacity of the receiving water body, the interception and storage facilities shall be reasonably set up, and their scale shall match the transmission and treatment capacity of the downstream sewage system.
2.2.7 Anti corrosion measures shall be taken for pipes, equipment and structures in contact with corrosive media in drainage works.
2.2.8 Warning signs and safety protection measures shall be set for open structures in drainage works, and they shall be clear, complete and effective.
2.2.9 The inspection well shall have anti falling performance, the well cover shall have anti-theft performance, and the well cover and well seat shall meet the bearing capacity and stability requirements required by the environment. Brick wells are prohibited in areas with high groundwater levels.
2.2.10 The pipe materials, pipe accessories, components (fittings) and main raw materials used in the drainage project shall comply with the provisions of the current national standards. When the products enter the construction site, they shall be accepted according to the relevant national regulations, and can be used only after they pass the acceptance.
2.2.11 Urban reclaimed water and rainwater utilization facilities shall meet the user's requirements for water quality, water quantity
The water pressure shall meet the requirements, and the water safety shall be guaranteed. The pipe shall not be connected with the drinking water pipe and the self provided water supply pipe.
2.2.12 The seismic fortification category of main facilities of urban drainage projects serving a population of more than 200000 shall be classified as key fortification category.
2.2.13 The structural design working life of the main structure and underground main pipe of the drainage project shall not be less than 50 years, and the safety level shall not be lower than Grade II.
2.2.14 The power transformation and distribution and control equipment of drainage works shall be provided with measures to prevent flooding. The power supply for urban drainage works shall be designed as per Class II load, and important equipment shall be designed as per Class -- load.
2.2.15 The drainage works shall be equipped with detection instruments and automatic control systems, and information services shall be provided by means of informatization.
2.2.16 In urban drainage works, structures (buildings) such as grid rooms and rainwater storage tanks with toxic and harmful gases or flammable gases shall be equipped with corresponding gas monitoring and alarm devices.
2.2.17 Special construction scheme shall be prepared for trenchless construction, crossing or crossing rivers and other special operations in drainage works.
2.2.18 Water storage structures of drainage works shall be tested with full water after construction, and can be put into operation only after passing the test.
3 Rainwater system
3.1 General provisions
3.1.1 The rainwater system shall include engineering measures such as source emission reduction, rainwater pipe network, waterlogging and danger elimination facilities, and non engineering measures such as emergency management to achieve the goal of waterlogging prevention and runoff pollution control, and ensure the stable operation of the system.
3.1.2 The flood control of the basin and regional drainage shall be considered as a whole. The design peak flood flow of the upstream incoming water shall not be higher than the receiving capacity of the downstream water body, and the flood risk shall not be transferred to the downstream towns.
3.1.3 The urban rainwater system shall be connected with the flood control system, and shall meet the requirements of urban waterlogging prevention in the most unfavorable conditions.
3.1.4 The urban rainwater drainage zoning shall be based on the natural terrain, combined with the water system distribution, urban vertical, land use layout and road traffic conditions, and determined according to the principle of high water drainage and low water drainage.
3.1.5 The facilities for source emission reduction, rainwater pipe network and waterlogging drainage shall be connected in vertical, plane and storage and drainage capacity to ensure that all kinds of facilities can give full play to their effectiveness.
3.1.6 The urban rainwater system management shall be equipped with sufficient equipment and personnel according to the urban scale, urban type, rainfall characteristics, rainwater system facilities, guarantee level and response time.
3.1.7 The emergency plan for urban waterlogging prevention and control shall determine the organizational system, prediction and early warning mechanism, disposal measures of relevant departments, information release mechanism and emergency guarantee mechanism, and shall formulate countermeasures for urban rainwater runoff, flood and facility failure that exceed the design standards.
3.1.8 Engineering and non engineering measures shall be taken to enhance the resilience of the rainwater system to rainfall exceeding the design return period of waterlogging prevention and control, and avoid casualties. Normal urban order should be restored quickly after the disaster.
4 Sewage system
Foreword
1 General
2 Basic regulations
3 Rainwater system
4 Sewage system
