Hubei pipe jacking special PE pipe, underground pipe network construction adaptation

Pipe jacking construction, as the mainstream process of trenchless construction, can complete the laying of underground pipe networks without large-scale excavation of the ground, which has little impact on urban operation and surrounding ecology. It is currently the preferred process for the construction and transformation of urban underground pipe networks. PE pipes adapted to the pipe jacking process are the core materials to ensure the smooth development of construction and long-term stable operation of the pipe network. The geological conditions in Hubei are diverse, and some urban areas have dense underground pipelines. The groundwater level along the river and lake is high, which puts forward higher requirements for the performance and adaptability of pipes used for pipe jacking construction. The special PE pipes for pipe jacking are the special pipe products developed for this kind of demand. The product is made of high-density polyethylene as the main raw material and is produced through extrusion molding process. The conventional nominal diameter covers DN300 to DN1200. The ring stiffness grade is divided into three grades: SN8, SN10, and SN12.5. The pressure grade covers 0.6MPa to 1.6MPa, which can meet the construction requirements of different burial depths and different conveying pressures. All performance indicators meet the relevant standards of the current national polyethylene pipe, and are specially adapted to the special working conditions of trenchless pipe jacking construction.

The core advantages of the special PE pipe for pipe jacking introduced this time mainly include four points, all of which are designed around the actual needs of pipe jacking construction:

The first is that the construction adaptability is strong, and it can be adapted to various pipe jacking process requirements. In view of the characteristics of large axial force and high friction resistance of pipe jacking construction, the product has made special project adjustments to the tensile properties of raw materials during the production process. The longitudinal fracture tensile rate exceeds 350%, which can withstand axial tension and radial pressure during the jacking process, and will not cause local depression, cracking and other problems. At the same time, the smoothness of the outer wall of the pipe has been optimized by special projects, which can effectively reduce the friction resistance of the soil layer during the jacking process, reduce the load of the jacking equipment, and adapt to the construction requirements of different jacking speeds. It can be directly jacked without additional protection treatment of the pipe. The operation can be adapted to the construction requirements of 150 meters for a single jacking, and it is suitable for various common geological pipe jacking constructions such as silty clay, sandy soil, and a small amount of pebble strata in Hubei.

The second is excellent weather resistance and corrosion resistance, suitable for complex underground environments. After laboratory corrosion resistance testing, the product is soaked in a soil environment with a pH value of 3-10 for a long time, and the retention rate of mechanical properties exceeds 95%. It will not appear rust, scaling and other problems. It is suitable for the underground environment with high humidity and high groundwater level in parts of Hubei along rivers and lakes. It can be directly buried in the ground without additional anti-corrosion treatment. At the same time, the product has good low temperature impact resistance. It will not crack when subjected to external impact in the construction environment of -5 ° C. It is suitable for the low temperature construction needs in Hubei winter, and can be operated normally throughout the year.

The third is that the interface has good sealing performance and reduces the leakage rate of the pipe network. The special PE pipe for pipe jacking adopts the connection method of hot melt docking, and the strength of the interface is higher than the strength of the pipe itself. After the hot melt docking, the interface has passed the water pressure test of 1.5 times the rated pressure without leakage. Even if it is subjected to uneven soil pressure during the jacking process, the interface will not be misplaced or fall off. It meets the leakage control requirements of urban water supply and drainage pipe networks, which can effectively reduce the leakage treatment cost of the later pipe network. At the same time, it is suitable for the transportation requirements of different media such as drinking water, rainwater, sewage, and low-pressure industrial wastewater.

The fourth is that the comprehensive cost is controllable, and the long-term use benefit is outstanding. The weight of the special PE pipe for pipe jacking of the same diameter is only 1/8 of that of the steel pipe, and the transportation cost is more than 60% lower than that of the steel pipe. The hoisting process can be completed without large lifting equipment. The construction period of a single jacking operation is about 40% shorter than that of the traditional excavation construction, which can effectively reduce the additional costs such as traffic dredging and site rental during the construction process. The overall construction cost can be controlled at about 70% of the traditional excavation construction. At the same time, the inner wall of the pipe is smooth, the conveying resistance is 30% lower than that of the cement pipe, and the long-term use will not scale. The dredging, operation and maintenance cost of the later pipe network is lower. Under normal use conditions, the service life can reach

The application scenarios of this product cover the construction needs of various underground pipe networks in Hubei, mainly including municipal underground water supply and drainage pipe network construction and renovation projects, power communication casing trenchless pipe jacking construction, industrial park sewage pipe network construction projects, and underground pipe network laying projects that cross highways/railways/buildings. At the same time, it can also be used for trenchless laying of agricultural irrigation pipe networks, and laying of rainwater storage pipe networks in sponge city construction. The suitable population includes municipal engineering construction units in Hubei region, pipe network construction owners, trenchless pipe jacking construction teams, water supply and drainage engineering design units, etc. All parties can choose products with corresponding caliber, pressure grade, and ring stiffness grade according to different construction conditions and medium transportation requirements.

The production process of this special PE pipe for pipe jacking strictly follows the relevant national standards such as "Polyethylene (PE) Pipe for Water Supply" and "Polyethylene (PE) Structural Wall Pipeline System for Buried Ground". All factory products have undergone multiple quality inspection processes such as appearance inspection, dimensional deviation inspection, and hydrostatic strength inspection. All performance indicators meet the requirements of relevant national and local engineering construction. Complete quality certification documents can be provided to meet the acceptance standards of various municipal engineering and people's livelihood projects, providing reliable support for the quality stability of underground pipe network construction in Hubei.