Information Center


Follow us and learn more News.

Construction of buried PE water supply pipe


Release time:

Sep 17,2019

Construction of buried PE water supply pipe 1. The burial depth shall be comprehensively determined according to the permafrost depth, use requirements, burial conditions and other factors, usually at least 0.3m below the deepest freezing line, and shall meet the following conditions: when the pipe diameter de<= 50mm, the minimum burial depth of the pipe top shall be 0.5m; However, when the pipe diameter de>50, the minimum burial depth of the pipe top is 0.7-1.0m;2. The trench bottom shall be continuous and flat, and there shall be no gravel, hard blocks and other protrusions on the surface of the trench bottom. 3. The pipeline can be laid directly on the undisturbed original soil foundation. If the foundation is rock or rock, 0.1~0.15m thick fine soil or sand cushion shall be laid. Where uneven settlement of the pipeline system can be caused, the foundation shall be treated or other anti-settlement measures shall be taken .. 4. In the pipeline system, separate foundations shall be established and fixed at the joints of valves, fire hydrants or other auxiliary materials and facilities, and anti-settlement measures shall be taken. 5. When slotting, the width of the trench bottom is generally 0.3m plus the outer warp. If the soil quality is good, when the trench depth is within 2m and within 3m without support, the width shall be added by 0.5m and 0.2m; For trenches with a depth of more than 3m, the width of the trench bottom shall be increased by 0.2m for every 1m of deepening. When the trench is supported by sheet piles, the trench depth is within 2m or 3m, and the trench width shall be increased by 0.4m or 0.6m 6 respectively. when the trench is excavated, the undisturbed soil 0.2m ~ 0.3m above the design elevation of the trench bottom shall be retained, disturbance shall be prohibited, and manual cleaning shall be applied before paving, but it is generally not suitable to dig below the design elevation of the trench bottom. if local over excavation is required, sand or original soil shall be filled and layered compaction shall be required. When the 7 ditch is buried with hard objects such as stones that are not suitable to be removed or the foundation is rock, semi-rock or rock, it shall be removed to 0.15~0.2m below the design elevation, and then sand shall be laid and compacted. The 1PE pipe can be connected to the ground in advance to form a long pipeline. After each welded joint is fully cooled, it will tend to be dragged to the edge of the ditch and placed in it. The maximum drag safety length that the pipeline can bear depends on the size of the pipeline and the conditions of the construction site. Generally, the maximum drag safety distance for small pipelines is 100m, and the larger is 50m. For flat laying, pipelines below DN100 can be slightly bent in summer, & pipelines above 110 can resist thermal stress due to sufficient soil resistance and do not need to reserve pipe length. When the pipeline is buried in a swamp or river bottom, when the backfill soil is too soft to resist the pipeline stress, the two ends of the pipeline are anchored to protect the joint. The paving distance depends on the surface area, specific gravity and the average pressure and friction coefficient between the pipelines. When 3PE pipeline is laid, the allowable bending radius of the pipeline shall meet the following regulations: when there are bearing joints and other auxiliary equipment on the pipe section, it shall not be less than 125D. Pipe nominal diameter D(mm) allowable bending radius (mm)D<= 5030D50

Construction of Buried PE Water Supply Pipe
1. The burial depth shall be comprehensively determined according to the permafrost depth, use requirements, burial conditions and other factors, usually at least 0.3m below the deepest freezing line, and shall meet the following conditions: when the pipe diameter de<= 50mm, the minimum burial depth of the pipe top is 0.5m; However, when the pipe diameter de>50, the minimum burial depth of the pipe top is 0.7-1.0m;
2. The trench bottom shall be continuous and flat, and there shall be no gravel, hard blocks and other protrusions on the surface of the trench bottom.
3. The pipeline can be laid directly on the undisturbed original soil foundation. If the foundation is rock or rock, 0.1~0.15m thick fine soil or sand cushion shall be laid. Where uneven settlement of the pipeline system can be caused, the foundation shall be treated or other anti-settlement measures shall be taken..
4. In the pipeline system, independent foundations shall be set up at the joints of valves, fire hydrants or other auxiliary materials and facilities, and shall be fixed with them, and anti-settlement measures shall be taken at the same time.
5. When slotting, the width of the trench bottom is generally 0.3m plus the outer warp. If the soil quality is good, when the trench depth is within 2m and within 3m without support, the width shall be added by 0.5m and 0.2m; For trenches with a depth of more than 3m, the width of the trench bottom shall be increased by 0.2m for every 1m of deepening. When the sheet pile support in the groove, the groove depth is within 2m or 3m, and the groove width should be increased by 0.4m or 0.6m respectively

6. When excavating the trench, the undisturbed soil 0.2m ~ 0.3m above the design elevation of the trench bottom shall be retained. Disturbance is prohibited. Manual cleaning shall be used before paving. However, it is generally not suitable to excavate below the design elevation of the trench bottom. For local over-excavation, sand soil or original soil that meets the requirements shall be used to fill and compact in layers.
7 When the ditch is buried with hard objects such as stones that are not suitable for removal or the foundation is rock, semi-rock or rock, it shall be removed to 0.15~0.2m below the design elevation, and then sand shall be paved for compaction,
1 PE pipe can be connected into a long and long pipeline on the ground in advance. After each welded joint is fully cooled, it will be dragged to the groove edge and placed in it. The maximum drag safety length that the pipeline can withstand depends on the size of the pipe and the conditions of the construction site. Generally, the maximum drag safety distance for small pipelines is 100m, and the larger one is 50m.
For flat laying, pipelines below DN100 can be slightly bent in summer, & pipelines above 110 can resist thermal stress due to sufficient soil resistance, and there is no need to reserve pipe length.
When the pipeline is buried in the swamp or river bottom, the backfill soil is too soft to resist the pipeline stress, the two ends of the pipeline are anchored to protect the joint, and the paving distance depends on the surface area of the pipeline, the specific gravity and the average pressure and friction coefficient between the pipelines.
3 When laying PE pipeline, the allowable bending radius of the pipeline shall meet the following regulations:
When there are bearing joints and other ancillary equipment on the pipe section, it should not be less than 125D.
Pipe nominal diameter D(mm) allowable bending radius (mm)
D<=50 30D
50160
Backfill
1 After the pipeline installation and laying should be backfilled as soon as possible. Due to the large thermal expansion coefficient of PE pipeline, the backfilling time is the lowest temperature in day and night.
2 Backfill materials are generally excavated earthwork, which should not contain rocks, frozen soil blocks and hard objects. When the pipe bed contains mud or is located in the middle of the road and is often crushed by vehicles, coarse sand should be used as backfilling material..
3 Backfilling is generally divided into two steps:
1) backfill the two ribs of the pipeline with sand soil or original soil that meets the requirements, with a backfill height of 0.1~0.15m at one time, and then backfill the second layer after tamping until backfill reaches at least 0.1m above the top of the pipeline. during backfilling, the gap between the lower part of the pipeline and the bottom of the pipeline must be filled, and no backfilling is carried out within 0.2m before and after the pipeline interface, so as to directly observe the quality of each joint during pressure test.
2) After the pipeline passes the pressure test, large-area backfilling shall be carried out. The original soil shall be backfilled for more than 0.5m above the top of the pipeline. When mechanical backfilling is adopted, backfilling shall be carried out from both sides of the pipeline at the same time. Machinery shall not run on the pipeline.
4 Before the pipeline pressure test, the backfill soil above the pipe top should not be less than 0.5m to prevent the system from moving during pressure test.
























The Importance and Advantages of PE Pipe in Water Supply Project

To learn more about the advantages of PE pipes in water supply projects, please read the details of this article.

2023-10-04

Shandong yushun pipeline engineering company limited: professional to provide high quality of PE pipe

Shandong yushun pipeline engineering limited company provide you with high quality pe pipe, to ensure the safety of water quality and water supply stability. Whether in the new project or in the old pipeline repair and replacement, Yushun pipeline can provide you with high-quality products and professional services. Choose Yushun pipeline, let us contribute to the development of the construction industry together!

2023-09-24

PE pipe manufacturers how to choose? Shandong water pipe recommended

Shandong water pipe manufacturers with its high-quality products, strong production capacity and excellent after-sales service has been widely concerned. Choose Shandong water pipe manufacturers, you will get satisfactory results to ensure the smooth progress of the project.

2023-09-14