Pipe shed pipe
Definition and structural characteristics
Pipe-roof pipe is a pipe used for advance support of underground projects. It is usually made of steel pipe with a large diameter.The length is between 89 and 180 mm, and the length is determined according to the specific project requirements. The common length range is 10 to 40 m. The wall of the pipe-roof pipe is thicker and can withstand greater stratum pressure. The thickness is generally around 5 to 10 mm. One end is usually processed into a pointed cone to facilitate jacking into the stratum. Grouting holes are also set on the pipe wall. The diameter of the grouting holes is generally 6 to 12 mm, and the spacing is about 15 to 30 cm. They are used to inject slurry into the stratum to reinforce the stratum and stop water.
How it works
Principle of advanced support: Before excavating underground projects (such as tunnels, underground passages, etc.), pipe-roof pipes are pushed into the ground at the designed angle and spacing. These pipe-roof pipes form a similarThe structure of the "shelf" can withstand part of the pressure from the stratum and transfer the upper load to the surrounding stable stratum. For example, in tunnel construction, the pipe shed can effectively prevent the surrounding rock on the top of the tunnel from collapsing during excavation, providing a safe space for subsequent excavation and support operations.
Principle of Grouting Reinforcement: Cement slurry or other chemical slurry is injected into the stratum through the grouting holes on the pipe-roof pipe. The slurry fills the pores and cracks of the stratum under pressure, bonding the loose stratum particles together, thereby improving the strength and stability of the stratum. At the same time, grouting can also play a role in stopping water. In areas with high groundwater levels, it prevents groundwater from seeping into the excavation area, ensuring the normal progress of construction.
advantage
Good support effect: Able to provide powerful advanced support and effectively control formation deformation. Under complex stratum conditions such as weak and broken, pipe shed pipes can significantly reduce safety risks during excavation and ensure the smooth construction of underground projects.
Wide range of applications：It can be applied to various geological conditions, such as clay, sand, rock and their mixed strata. And it is suitable for underground projects of different shapes and sizes, such as circular, rectangular tunnels or underground passages.
Good compatibility with other support methods：Pipe-roof pipe support can be used in combination with other support methods such as anchors, shotcrete, steel arches, etc. For example, in tunnel construction, pipe-roof pipes are used in combination with steel arches. The pipe-roof pipes provide advance support, and the steel arches provide immediate support after excavation. The two work together to greatly improve the overall stability of the tunnel.
Application Areas
Tunnel Engineering。
Underground passage project。
Mining Engineering。
Tunnel Engineering
Mountain Tunnel Construction。
Urban subway tunnel construction。
Underground passage project.
Construction of underground pedestrian passage。
Underground vehicle passage construction。
Mining Engineering
Mine tunnel development。
Deep mine support。
Seamless steel pipe
Outer diameter (mm） | Wall thickness (mm） | length(m） |
89 | 4.5、6 | 6, 9, 12, etc. |
108 | 4.5、6、8 | 6, 9, 12, etc. |
127 | 6、8、10 | 6, 9, 12, etc. |
159 | 6、8、10 | 6, 9, 12, etc. |
Hot rolled seamless steel pipe
Outer diameter (mm） | Wall thickness (mm） | length(m） | Outlet hole diameter (mm） |
108 | 6 | 40 | 15 |
Welded steel pipe
Nominal diameter DN（mm） | Outer diameter (mm） | Wall thickness (mm） | length(m） |
80 | 89 | 4、5、6 | 6, 9, 12, etc. |
100 | 108 | 4、5、6、8 | 6, 9, 12, etc. |
125 | 133 | 4.5、6、8 | 6, 9, 12, etc. |
150 | 159 | 6、8、10 | 6, 9, 12, etc. |
British pipe thread
Size code | Number of teeth | Median diameter (mm） | External thread major diameter (mm） | Internal thread diameter (mm） |
G1/4 | 19 | 13.175 | -0.25 | 12.80-0.1 |
G3/8 | 19 | 16.662 | -0.25 | 16.20-0.1 |
G1/2 | 14 | 20.955 | -0.284 | 20.30-0.1 |
G3/4 | 14 | 26.441 | -0.284 | 25.80-0.1 |
G1 | 11 | 33.249 | -0.36 | 32.50-0.2 |
G1-1/4 | 11 | 41.910 | -0.36 | 410-0.2 |
G1-1/2 | 11 | 47.803 | -0.36 | 46.80-0.2 |
G2 | 11 | 59.614 | -0.36 | 58.60-0.2 |
G2-1/2 | 11 | 75.184 | -0.434 | 74.10-0.2 |
G3 | 11 | 87.884 | -0.434 | 86.80-0.2 |
Metric pipe threads
Nominal diameter (mm） | Pitch（mm） |
10 | 1.5 |
12 | 1.75 |
14 | 2 |
16 | 2 |
18 | 2.5 |
20 | 2.5 |
22 | 2.5 |
24 | 3 |
27 | 3 |
30 | 3.5 |
The thread size of the pipe-roof pipe is usually determined based on the pipe diameter, project requirements and the connection method used, and may be adjusted in actual application.
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