Pre-construction Work of Groove Soft Sealed Gate Valve Water Supply Pipeline
Publisher：Botou Valve
With the opening of economy, the acceleration of urbanization process and the trek of citizens'daily level, municipal water supply system, as one of the supporting projects of urban infrastructure construction, is closely related to the production of national economy and people's daily life. In addition, ditch soft-sealed gate valve water supply pipeline project requires higher construction quality, so it must be strictly constructed according to the construction technology and planning requirements, otherwise, once pipe explosion occurs. Or leakage, will seriously affect the process of urbanization and the normal life of residents, directly affect the economic and social benefits of water supply enterprises, so in the pipeline construction, the key link should be strictly taken to ensure the quality of the project.
Preparations for Pre-construction
1. Preparations for construction site
(1) Do well the three-way operation according to the pipeline direction surveyed on the spot, construction and excavation work surface and material yard, etc.
(2) Measuring and lofting according to the planned route.
(3) To investigate whether there are concealed projects in the pipeline construction area, such as optical cables, strong electricity, water supply, heating and gas pipelines, and if there are, to contact the relevant units in time and send special personnel to help locate and locate them.
2. Skill preparation
(1) Before the start of construction, the builder should know the drawings and understand them. Understand the basic features of the project, such as pipeline length, pipeline direction, pipe diameter, number of inspection wells and settings, understand the planning intent and the content to be changed, and then ask the planner questions and changes after picking up the unclear points.
(2) Examine the quantity of drawings, varieties and quantities of materials used, make material plans in advance and report to the Material Purchase and Marketing Department for purchase.
(3) Set up a reference point of leveling elevation every 100 meters or so, and set up a control network of leveling elevation, so as to measure the pipeline construction, check the total elevation, control piles are always firmly set in an obvious and not easily damaged position.
2. Trench Excavation
1. Lime spraying line should be laid out before excavation. The width of excavation should be calculated according to the requirements of planning drawings or relevant regulations according to the soil type and the excavation depth of slope ratio. Ensure that the groove bottom net width satisfies the planning requirements and relevant provisions.
2. Watch out for the scientific rationality and economy of the slope sloping. The groove bottom elevation allows the fault to be controlled within the scope of the norms. Special attention should be paid to the groove not to be over-excavated. For the Over-excavated part, special treatment should be given to tamping and filling. In order to prevent water inflow and water accumulation, humus soil, waste soil and silt are used in tamping and filling, and to ensure the construction of a single well with small excavation face or poor soil quality due to the restriction of wiring, it is necessary to consider setting up support.
3. The trench excavation is mainly carried out by machinery and supplemented by manual work. If the pipe can not be removed in time after excavation, 20 cm thick original soil should be reserved at the bottom of the trench to prevent the thick soil from deflecting at the bottom of the trench.
4. The groove bottom should satisfy the requirement of planning bearing capacity, and the parts with floating soil and soft soil should be compacted.
