Internally acting type ductile iron jacking pipe for integral trenchless pipeline construction

Abstract

The invention provides an internally acting type ductile iron jacking pipe for integral trenchless pipeline construction. One end of a cylinder section is connected with a spigot section, and the other end of the cylinder section is connected with a socket section; and a socket seal section is connected with a socket push section. According to the use requirements and manufacturing process of theinternally acting type micro jacking pipe, by reducing the inner diameters of small sections of the socket section and the socket section, the wall thickness of the part of a pipe body is increased tomeet the requirements of transmitting the pushing force. Through the thickening of the tail ends of the spigot section and the socket section, the compression stress of the spigot section is reducedby more than half; the jacking pipe is produced by adopting an integral casting method; and no additional flanges and reinforcing ribs are required, which reduces the material consumption and bondingworkload of the jacking pipe, reduces the production cost, and improves the production efficiency. The internally acting type ductile iron jacking pipe reduces the inner diameters of the small sections of the spigot section and the socket section, increases the wall thickness of the part of the pipe body, and meets the requirements of transmitting the pushing force. The jacking pipe is produced byadopting the integral casting method, which reduces the weight and the difficulty of production. The internally acting type ductile iron jacking pipe is used in the field of trenchless construction in water delivery projects.

Description

technical field [0001] The invention relates to a nodular cast iron pipe jacking for an internal-acting integral trenchless pipeline construction in the technical field of trenchless construction of a water delivery project. Background technique [0002] With the development of society, there are more and more requirements for improving people's livelihood, among which pipeline water transmission projects account for a large proportion. Ductile iron pipes have been widely used due to their high cost performance. In relatively open spaces, ductile iron pipelines are generally constructed by excavation and direct burial. However, in relatively crowded cities, or in special areas such as crossing rivers and roads, excavation and direct burial cannot be realized, and trenchless underground roofing must be used. pipe construction. [0003] At present, the ductile iron jacking pipes used in the market are all cast or welded with a jacking flange on the outer circle of the socket...

AI Technical Summary

Problems solved by technology

If the cost of the flange is converted to the short pipe, it will be multiplied many times, and it is difficult for the owner to bear such a high cost

This greatly limits the popularization and application of micro-jacking pipes.

[0004] Patent No. 201821219184.0 discloses an underground pipe jacking with a ductile iron T-shaped joint for a negative pressure sand box. This patent uses an ordinary ductile iron integrally cast T-shaped joint for underground pipe jacking. Thrust requirements can only be transmitted by means of external flanges and reinforcing ribs. It belongs to an external-action pipe jacking structure with external push flanges. It is heavy, difficult to manufacture, and low in production efficiency. Tubes are expensive to produce

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