How to backfill PE drag pipe? What is the construction process of PE tractor pipe?

1. Backfill the two ribs of the pipeline with sand or the original soil that meets the requirements, with a backfill height of 100 150 mm, and then backfill the second layer until the backfill is at least 100mm above the top of the pipe. In the process of backfilling, the gap between the lower part of the pipe and the bottom of the pipe is easy to be ignored, and attention should be paid to tamping. No backfill is done within 200mm before and after the pipe interface, so that the quality of each joint can be observed during the pressure test.

2. After the pipeline pressure test is qualified, the large area backfill (500mm thickness), the top of the pipe is more than 300mm part of the backfill of the original soil and filled, when the mechanical backfill is used, it should be backfilled from both sides of the pipe at the same time, and the machinery shall not drive on the pipe. After backfilling 300mm above the top of the pipe, the pipeline pressure test is carried out to prevent the pipeline system from moving during the pressure test. The backfill within 200mm around the pipe shall not contain hard stones with a particle size greater than 10mm.

Under normal circumstances, the use range of PE water supply pipes as underground pipes is relatively wide. The comparative test of the wear resistance of PE water supply pipe and steel pipe shows that the wear resistance of PE gas pipe is 4 times that of steel pipe. In the field of slurry transportation, PE water supply pipes have better wear resistance than steel pipes, which means that PE gas pipes have a longer service life and better economy.

The flexibility of PE water supply pipes makes it easy to bend, and it can be engineered to bypass obstacles by changing the direction of the pipe, and in many cases, the flexibility of the pipe can reduce the amount of pipe fittings and reduce installation costs. PE gas pipes have a smooth inner surface and their Manning coefficient is: The smooth performance and non-adhesion properties ensure that the PE gas pipe has a higher conveying capacity than traditional pipes, while also reducing the pressure loss of the pipeline and the energy consumption of the water conveyance.

PE water supply pipe is lighter than concrete pipes, galvanized pipes and steel pipes, and it is easy to handle and install.

Change "I want to take care of it" to "I want to take care of it". “

1. Measure and pay-off. Set up a plane position control point every 2m on the ground of the PE tow line, measure the natural ground level of each control point with a water level meter, make a clear mark, start from the excavation point, and the drag line must be kept straight.

2. PE drag pipe off-line detection and protection. Use on-site turnover coverage, combined with pipeline inspection instrument measurement methods, to determine the location, depth and direction of underground pipelines and cables, and mark the surface.

3. Installation and debugging of PE tractor pipe of drilling machine. After the rig is installed, a test run should be carried out and the head of the rig should be adjusted to an angle to guide the drilling.

4. Guide hole drilling. Place the probe of the detector on the pilot drill bit before drilling, test the reflected signal of the probe to ensure the accuracy of the probe, and then guide the drill bit to drill the drill bit into the soil at an angle of 5 to 7 degrees, and measure the bit position every 2 meters. When the soil depth reaches the center height of the design pipe location, the guide rod is straight along the axis of the pipe until the well is received.

5. a reaming hole. According to the torque and pullback force after hinging, use 600 reaming head to clean the hole 1-2 times to ensure the smooth laying of the pipeline.

6. Pipe connection. To ensure the quality of the joints, when docking, the two joints should be flat and kept clean, and the centers of the two pipes should be on the same axis. The heating temperature should be in place, and the specified pressure and time should be maintained during docking.

The construction of PE towing pipe also has certain requirements, in the installation and construction of PE tractor pipe, it is not only necessary to consider avoiding other underground pipelines within the range, but also to consider some factors such as the ground environment, hydrogeology, the diameter and material of the PE towing pipeline, the length and depth of the penetration, and the performance of the drilling rig.

The construction trajectory of the pipeline must be designed in advance, and the construction must be carried out in accordance with the design requirements, considering the length of the curve section and oblique straight section of the soil entry point and the excavation point, and strictly controlling the height and depth of each point of the horizontal crossing section.

It is necessary to turn this backfill stone into an open cut, clean it up and then carry out the escrow construction.

Both are PE pipes in terms of material, but the construction method is different.

PE towing pipe is slotted into the pipeline, and then drilling on the other side with a tractor machinery to drag the pipe over, generally a pipe welding after the construction.

During the construction of pipe jacking, a working well and a receiving well should be set up on both sides, and then one section of the pipeline should be jacked into most of the working well, and then another section should be welded, and the pipeline should be gradually jacked to the opposite receiving well.

The construction of the tractor pipe is simple, the construction of the pipe jacking is complex, the construction time is long, and the cost is also high.

The PE tractor pipe is non-toxic, does not contain heavy metal additives, does not scale, does not breed bacteria, and solves the problem of secondary pollution of drinking water. It complies with the provisions of GB T17219 safety evaluation standards and the relevant health evaluation regulations of the Ministry of Health. The low temperature embrittlement temperature of polyethylene is very low, and it can be safely used in the temperature range of 60 °C - 60 °C.

The comparative test of the wear resistance of the pipeline and the steel pipe shows that the wear resistance of the PE pipe is 4 times that of the steel pipe, and in the field of mud transportation, the PE pipe has better wear resistance compared with the steel pipe, which means that the PE pipe has a longer service life and better economy.

PE tow pipe has high strength, heat resistance and long service life.

When carrying out pipe jacking construction, it is first necessary to do measurement and lofting, use underground and other methods to determine the location and mode of construction, and mark the construction safety height at the same time.

Secondly, in the construction process, as a pipe jacking construction, it is necessary to cooperate with each other underground and aboveground, install jacks, guide rails and other tools underground, ensure the normal operation of pipe jacking tools, and at the same time when on the well, it is necessary to set up lifting equipment, main top pumping station, etc., and first need to determine the surrounding environment of construction during construction, and formulate a construction plan in combination with the actual situation.

The construction of pipe jacking method is to overcome the friction between the pipeline and the surrounding soil with the help of the jacking equipment generated by the jacking equipment in the working pit, jack the pipeline into the soil according to the designed slope, and transport the earthwork away. After the first section of the pipe is finished jacking into the soil layer, the second section of the pipe is continued to be jacked. The principle is to use the thrust of the main top cylinder, the pipeline, the relay room, etc., to advance the tool pipe or roadheader from the working pit through the soil layer to the receiving pit and lift it.

The pipe is buried between two pits immediately after the tool pipe or TBM.

1. The towing pipe is generally called the traction towing pipe, which is a kind of pipeline that plays a traction and dragging role in the pipeline, and its cohesion and toughness are relatively good.

2. Pipe jacking technology is a non-open excavation pipeline laying construction technology used for municipal construction. The advantage is that it does not affect the surrounding environment or has little impact, the construction site is small, and the noise is small. Moreover, it can operate deep underground, which is an incomparable advantage of excavating buried pipes.

However, the pipe jacking technology also has disadvantages, the construction time is long, and the project cost is high.

1. The ring stiffness of the PE towing pipe, according to the depth of laying, the PE towing pipe grade suitable for the pressure of the engineering environment should be selected.

2. Pull up index, when dragging a long line distance, in the case of a long distance, the selected pipe should be selected with relatively large pressure, such as the above, mainly for the safety of construction. Solan.

3. The ** of PE tractor pipe, in the actual purchase of the calendar, is not the more expensive the better, of course, do not be greedy for cheap and buy inferior PE tractor pipe, sometimes because of a small price difference to the project to bring trouble but the gains outweigh the losses.

Good health performance: no heavy metal salt stabilizer is added during the processing of PE water supply pipes, the material is non-toxic, no scale layer, and no bacteria breeding, which well solves the secondary pollution of urban drinking water.

2. Excellent corrosion resistance: except for a few strong oxidants, it can resist the erosion of a variety of chemical media; No galvanic corrosion.

3. Long service life: under the rated temperature and pressure conditions, the PE water supply pipeline can be safely used for more than 50 years.

4. Good impact resistance: PE water supply pipe has good toughness, high impact strength, and heavy objects directly press through the pipeline, which will not cause the pipeline to burst.

5. Reliable connection performance: the strength of the hot melt or electric fusion interface of the PE water supply pipe is higher than that of the pipe body, and the joint will not be disconnected due to soil movement or live load.

6. Good construction performance: the pipeline is lightweight, the welding process is simple, the construction is convenient, and the comprehensive cost of the project is low.

7. Light weight, convenient handling, loading and unloading: small density, convenient handling, loading and unloading, and construction.

8. Excellent corrosion resistance: it has excellent acid resistance, alkali resistance and corrosion resistance, which is very suitable for the use of chemical industry.

9. Small fluid resistance: the inner wall of the pipe is smooth, its roughness coefficient is only, and the fluid resistance is small, which effectively improves the hydraulic conditions of the pipe network and reduces the operating cost of the system.

1. High elongation at break, good extensibility and excellent scratch resistance.

2. Non-toxic, good toughness and high impact strength.

3. Good insulation performance, excellent wear resistance and chemical corrosion resistance.

4. Good heat insulation, low medium flow resistance.

5. It is convenient and economical to lay, safe and reliable to use.