A push-push ductile iron pipe and its pipe connection structure

Abstract

The invention provides a pushing nodular cast iron pipe and a pipe connecting structure. The inner surface of a socket is sequentially provided with an anti-dropping cavity, a welding ring contact arc face and a sealing cavity from the socket to an insertion opening in the axial direction; the longitudinal section of the anti-dropping cavity is in a wedge shape, the anti-dropping cavity comprises a rising slope and an anti-dropping vertical face, and the welding ring contact arc face is located at the end of the anti-dropping vertical face; the sealing cavity comprises a limiting vertical face, a step-shaped falling slope and a pushing vertical face which are sequentially connected; the outer surface of the insertion opening is provided with a welding ring and a force bearing boss which are sequentially distributed in the axial direction from the insertion opening to the socket, the distance between the end face, close to the insertion opening, of the force bearing boss and the end face, close to the insertion opening, of the welding ring is equal to the distance between the end face of the socket and the welding ring contact arc face, and the distance between the end face, close to the insertion opening, of the force bearing boss and the end face of the insertion opening is equal to the distance between the end face of the socket and the pushing vertical face; and an anti-dropping ring is arranged in the anti-dropping cavity, and a sealing rubber ring is arranged in the sealing cavity. In the backwards-dragging process of the pushing nodular cast iron pipe, the capacity of bearing the pulling force and the pushing force is achieved at the same time, and the connecting intensity of a pipe connector is high.

Description

technical field [0001] The invention relates to a ductile iron pipeline and a pipeline connection structure, belonging to the technical field of non-excavation engineering. Background technique [0002] In recent years, with the continuous improvement of urban environmental protection requirements, in order to reduce the damage of ground excavation to the environment and the negative impact on urban traffic and residents' life, horizontal directional drilling (HDD) has gradually become The main technical means for laying underground pipe networks in rivers, lakes, nature reserves and complex stratum environments. Ductile iron pipe is a new type of pipe introduced and developed in recent years. It is formed by centrifugal casting and has a dense pipe wall. Due to its high tensile strength, good metal ductility and excellent anti-corrosion performance, it is more and more used as urban water supply pressure pipes. [0003] At present, there are not many engineering cases of ...

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Problems solved by technology

[0003] At present, there are not many engineering cases of laying ductile iron pipes using horizontal directional drilling in China. The main reason is that the ductile iron pipes currently used for horizontal directional drilling can only bear limited tension and cannot withstand rammers or other auxiliary jacking. The force of the device, resulting in a serious limitation of the distance of the pipeline back towing, and a substantial increase in the construction risk during the back towing process

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