Brief Introduction, Construction Steps and Physical Properties of MPP Power Pipe

First, construction instructions

1, MPP power pipe transportation, construction process is strictly prohibited arbitrary throwing, impact, marking, exposure.

2, MPP power pipe hot melt butt two tube axis should be aligned, the end face cutting to be vertical flat.

3, Wuhan MPP power pipe processing temperature, time, pressure, depending on the climate conditions to adjust accordingly.

4, MPP power pipe pipe minimum bending radius should be 75% of the outer diameter of the pipe.

5, Hubei MPP power casing standard fixed length (6 meters, 9 meters) pipe configuration pillow 3 pay, pipe pillow spacing of 2.0m, pipe pillow from the joint is 0.5m.

2. Construction method

(1) The preparatory work stage before construction, that is, organize technicians to re-test the plane control points and leveling points delivered by the owner, set up temporary leveling points at a distance of about 150 meters, and close them with the elevation reference point. The closing difference is less than the specification requirements. The elevation control baseplate elevation is measured by BJD23 automatic leveling level. The construction control network and the starting point of the construction level should be set in a place that is not disturbed, firm and reliable, and has good visibility conditions, which is convenient for control. On the premise of matching the elevation with the elevation of the sidewalk, the project and the main road should also be considered.

(2) The trench construction is based on the local obedience to the whole, creating conditions for the overall appearance.

1, trench earth excavation

① The trench construction adopts trapezoidal fracture, section excavation, mainly mechanical, manual cooperation. Adopt straight groove form of excavation. Strictly control the design elevation of the bottom of the trench during excavation, and the mechanical excavation should keep 10cm with manual bottom cleaning, so as not to disturb the undisturbed soil at the bottom of the trench by mechanical operation. If there is bad soil, report it in writing to the owner and the supervision engineer, and then make construction treatment after approval.

② Do a good job of foundation pit drainage during excavation, and the maximum area of 15cm 15cm symmetrical on both sides of the drainage ditch is appropriate. Before and during construction, the exclusion of surface water and the recruitment and drainage of water accumulation in the base are tested to ensure that the condenser baseplate is constructed in a waterless environment. During the excavation of the foundation pit, no abandoned soil and building materials are piled up near Jihang, so as to achieve civilized construction. When excavating the foundation pit, if bad soil is encountered, the slope should be appropriately increased to ensure the working surface at the bottom of the groove.

2. Before the construction of the trench concrete baseplate, level the trench baseplate, release the trench center line, and use the trench soil mold to pour the concrete baseplate according to the designed height and width. The concrete is labeled C15, and the commercial concrete is used with a thickness of 10cm. When pouring, vibrate strictly according to the requirements until it is completely dense. After pouring, light collection is carried out and timely maintenance is achieved to ensure the strength of the concrete. The trench baseplate should be 3% sloped in the direction of drainage, so as to drain the cable trench.

3, the laying of the cable pipe is tiled on the concrete baseplate with a 10cm thick medium sand cushion, and then laying the cable pipe, and filling the gap between the pipes with sand, tamping with wooden sticks, so that the sand forms an arc-shaped pipe bed on the outer wall of the pipe. When laying the pipe, the joints of each section should be staggered to ensure that the connection is tight and no sand can penetrate. After the pipe group is laid, an 8 #iron wire is penetrated into each hole for future threading. According to the construction requirements, lay the pipe layer by layer, and wait for the top. After the layer of pipe is laid, lay a 10cm thick medium sand cushion.

4, The earth backfill step settles, so that the sand and the cable pipe form a dense whole. After the telephone row has been laid, the earthwork is returned to the border, mainly by machinery and manual cooperation. Layered backfill, the thickness of each layer is 15cm, the well is tamped, and the height of the backfill matches the elevation of the main road surface. The remaining soil is transported to the residual soil disposal site by dump truck.

3. Physical properties

Technical performance items Technical performance indicators Test method Density 0.90~ 0.94GB/T1033.1 Ring stiffness (3% room temperature) SN24 grade ☺ 24GB/T9647-2015SN32 grade ☺ 32SN40 grade ☺ 40 Flattening test When the vertical deformation of the pattern is 50% of the original inner diameter, the

style should not crack or crack

DL/T802.7-2010 Drop hammer impact pattern should not crack or crack DL/T802.7-2010 Vicat softening temperature ☺ 150 ℃ GB/T-1633-2000 Tensile strength Pipe: ☺ 25;

Welded joint: ☺ 22.5

GB/T8804.3-2003 Elongation at break ☺ 400% GB/T8804.3-2003 Bending strength ☺ 36MPaGB/T9341-2000MPP power pipe is a customized product, Wuhan MPP power pipe, Hubei MPP power pipe manufacturer is Hubei Yuyuan Building We have a number of high-speed production lines, which are faster than the production speed of ordinary manufacturers. Generally, contact us to customize MPP pipelines, which can be delivered within one to three days, which can effectively ensure the construction progress.

Source: Hubei AD Building Materials Co., Ltd., welcome to share! Hotline: 17399989993