before excavating the pipeline trench, conduct a comprehensive understanding of the geological conditions of the construction site, groundwater conditions, and design requirements of the rain and sewage system, and reasonably determine the buried depth of the pipeline and the treatment method of the foundation. Among them, the most important work is to verify the bearing capacity of the foundation foundation. If it does not meet the construction requirements, it should be dealt with through measures such as replacement and stone throwing to improve the bearing capacity of the foundation. After preparing for construction, the trench should be mined according to the pipeline construction plan. The geometric dimensions of the trench should conform to the design plan. If there are loose stones and earth blocks at the bottom of the trench, it should be removed, and a sand cushion should be laid on it to compact and level, so as to avoid hard objects from damaging the Wuhan HDPE double-wall corrugated pipe.

2. Install

to install the HDPE double-wall corrugated pipe. Review the depth, width, and bottom standard of the trench. After confirming that there is no gravel, broken soil, etc. in the trench, the installation work is officially started. HDPE double-wall corrugated pipe itself is not of high quality. Generally, large-scale hoisting devices are not required. If the buried depth of the pipeline is less than 3.0m and the diameter is lower than DN500, the lower pipe can be manually used. If the buried depth of the pipeline is higher than 3.0m and the diameter is higher than DN500, the hoisting installation method needs to be adopted. When hoisting and installing, the pipeline should be smooth when it is lowered to the bottom of the trench and cannot disturb the foundation. When it is necessary to cut the pipeline, the pipeline section should be vertical and flat, and the pipeline itself cannot be damaged. When installing, pay attention to the following points: First, the pipeline should be laid in a straight line. If it needs to be laid in a folded line, the relative corner should not be greater than 2; Second, after the pipeline is lowered, the drainage in the groove should be good, and there should be no water accumulation to prevent electric shock accidents; Third, the interface between the pipe and the pipe should leave a certain space to facilitate subsequent connection.

Third, the connection methods of connecting

HDPE double-wall corrugated pipe mainly include heat shrinkage sleeve connection, electric hot melt belt connection, etc., and their respective operation points are different. In the heat shrinkage sleeve connection method, first clean up the moisture and debris on the surface of the pipe, use the heat shrinkage belt to tightly wrap the pipe joint part, and use a flame gun to slightly bake the heat shrinkage belt and the pipe contact part. After that, wrap the baked heat shrinkable tape with another heat shrinkable tape, clamp it tightly, and then bake it with a flame gun at the part where the heat shrinkable tape is wrapped, first up and down, then left and right, so that the heat shrinkable tape is completely close to the pipe. In the connection mode of the electric hot melt belt, the surface of the pipe should also be cleaned first, the joint part should be wrapped with the electric hot melt belt, and the buckle belt should be fastened. Connect the electric hot melt belt to the electric hot melt machine, set the current intensity and heating time. After the electric hot melt is completed, fasten the buckle belt again and cool for a period of time. After checking that the connection quality meets the standard requirements, release the buckle belt. In addition to the connection between the pipe and the pipe, the connection between the Wuhan

Jingjie HDPE double-wall corrugated pipe and the well should also be paid attention to. HDPE double-wall corrugated pipe first goes deep into the well from the pipe trench, and the pipe is propped up with a support device to prevent concentrated load or shearing. Common way of connecting HDPE double-wall corrugated pipe with the well wall: Apply polyvinyl chloride adhesive at the connection between HDPE double-wall corrugated pipe and the well wall, lay a layer of fine sand on it, penetrate the pipe into the well wall, and use cement mortar to build and block.

4. Water closure test

After the pipeline is connected, conduct a water closure test to confirm whether the tightness of the pipeline in the water injection situation meets the requirements. First, check whether there is blockage, water accumulation, etc., inside the pipeline. After confirming that there is no above situation, inject water into the pipeline. After water injection, keep it for a period of time. If the scale of the pipeline project is large and it is impossible to implement the closed water test one by one, the closed water test pipeline can be determined by sampling. If water seepage or leakage is found, the test should be stopped immediately, the pipeline connection should be re-carried out, and the closed water test should be carried out again.

Fifth, backfill

After completing the above work, start the backfill work. Backfill from the connection part of the pipeline and the foundation first. The method adopts a symmetrical form. It is forbidden to backfill on one side and then backfill on the other side. The symmetrical method is also used for tamping to reduce the impact on the pipeline and avoid the deformation of the pipeline. When backfilling, a layered filling method is used, and the thickness of each layer of backfill soil is controlled between 0.15m and 0.20m. The thickness of the backfill soil layer at the top of the pipeline is about 0. If conditions permit, mechanical rolling can be used to ensure that the compaction of the backfill meets the design requirements.

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