Construction Method Atlas for Buried Utility Pipe Sleeves

I. Casing design Length: The length of the casing should meet the requirements related to the groundwater level, the depth at which underground pipelines are buried, and vehicle loads. Diameter: The diameter of the sleeve should be slightly larger than the outer diameter of the pipe, to ensure that the pipe can pass through the sleeve smoothly, while also leaving enough space for sealing. Materials: Materials with high compressive strength, corrosion resistance, and good water resistance should be used, such as polyethylene and steel pipes. At the same time, the material should possess properties such as resistance to low temperatures, high temperatures, impact, and wear. Water drainage holes: To prevent water from accumulating inside the casing, it should be equipped with water drainage holes. Corrosion protection: The casing should be treated with corrosion-resistant materials to extend its service life. Strengthening measures: When the sleeve is installed in locations subject to high passing loads, measures such as the use of steel pipes or anchoring designs should be employed for reinforcement. II. Construction Process: Location determination and measurement: Determine the position of the casing on the road, and mark the starting point and ending point of the casing according to the design requirements. Ensure that the position and orientation of the sleeve are accurate. Clearing work: Remove obstacles from the construction site to ensure smooth progress of construction activities. Casing installation: The casing is installed underground gradually along the path specified in the design. During installation, a level and a ruler should be used for measurement in order to adjust the casing so that it meets the design requirements. Concrete pouring: A support structure is erected around the casing, and concrete is poured according to the designed mix ratio. Pay attention to controlling the fluidity of the concrete to ensure that it fully fills the gaps between the casing and the pipes. At the same time, a vibrator is used to compact the concrete in order to improve its density and strength. Demolding and cleaning: Once the concrete has reached a certain strength, demolding is carried out. Apply a release agent to the surface of the casing to prevent concrete from sticking to it. After demolding is completed, the construction site is cleaned up to remove any excess materials and equipment. III. Sealing both ends of the casing – Sealing the two ends of the casing is one of the key steps to ensure the safe operation of the pipeline. There are various methods of sealing, and the following is a common one: Clean the sleeve by removing any debris or rust inside it, and then apply two coats of anti-rust paint. Sealing materials: Use materials such as jute hemp and asbestos cement for sealing. Oil hemp is used to fill the area between the casing and the pipeline, while asbestos cement is used to fill the water-facing side and the inner sections. Sealing steps: Seal in three stages. The middle part was filled with linseed oil for the first time, the water-facing side was filled with asbestos cement for the second time, and the inner side was filled with asbestos cement for the third time. Moist curing should be carried out promptly after each sealing. End face repair: Create grooves 20 mm deep at each end of the sleeve, and fill them with waterproof paste or fireproof putty to ensure a smooth end surface. IV. Relevant specification atlases: During the design and construction processes, relevant specification atlases should be referred to to ensure construction quality and safety. For example, relevant standards and atlases such as the \"Code for Construction and Acceptance of Buried Plastic Drainage Pipes\" can be referred to. These specification manuals provide detailed guidance on construction procedures, material selection, quality requirements, etc., helping to ensure the standardization and safety of the construction process.

Without considering insulation, a larger size will suffice; the main concerns are corrosion protection and stiffness of the pipes, and polyurethane foam can be used for sealing.