Encased concrete nodular cast iron pipe

Abstract

The invention discloses an encased concrete nodular cast iron pipe and relates to the technical field of a socket-type nodular cast iron pipe. The encased concrete nodular cast iron pipe comprises a socket-type nodular cast iron pipe body; both ends of the socket-type nodular cast iron pipe body are respectively provided with a socket and a spigot; the outer wall of the socket-type nodular cast iron pipe body is coated with a concrete layer for ensuring the continuous lengths of the socket-type nodular cast iron pipe body equal; a cylindrical reinforcing mesh is sandwiched in the concrete layer; a connecting flange set is arranged at the outer end of the spigot; a ring-shaped boss is arranged outside the end part of the socket; and the outer diameter of the ring-shaped boss is the same with that of the concrete layer. The encased concrete nodular cast iron pipe has the advantages that (1) the concrete layer is coated on the outer wall of the socket-type nodular cast iron pipe body, so that the diameters of both ends of the socket-type nodular cast iron pipe body are ensured equal, the jacking construction is convenient to carry out, the construction period is shortened, the engineering cost is reduced, concrete on the outer layer of the socket-type nodular cast iron pipe body can also protect the socket-type nodular cast iron pipe body and the service life is prolonged; and (2) flanges and reinforcement plates are arranged at the end of the spigot of the socket-type nodular cast iron pipe coated with the concrete layer and the end of the spigot is used as a bearing end in the jacking construction, so that the construction is convenient to carry out.

Description

technical field [0001] The invention relates to the technical field of socket-type ductile iron pipes, in particular to a concrete-wrapped ductile iron pipe used in pipe jacking construction. Background technique [0002] Socket-type ductile iron pipes have the advantages of good mechanical properties, high interface reliability, good corrosion resistance, and long service life. They are widely used in industrial sectors such as urban construction water and gas transmission. Laying requires the excavation of trenches. With the large-scale development of urban construction, people put forward higher requirements for the living environment. The laying of some pipelines needs to pass through densely populated areas and it is not allowed to dig trenches on the ground, or due to the restrictions of construction conditions, such as crossing roads, Railways, rivers, ground buildings, etc. cannot lay trenches on the ground to lay pipelines, prolong the construction period or increa...

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Problems solved by technology

[0004] The design concept of the present invention is realized in this way. The existing socket-type ductile iron pipes are widely used in the fields of urban construction water transportation and gas transportation due to their advantages of corrosion resistance and good mechanical properties, but the pipelines need to be excavated during the construction process. Trench burial, along with urban development and environmental requirements, it is no longer allowed to excavate trenches for burial. At the same time, when pipeline construction needs to pass through roads, bridges and buildings, excavation of trenches is not allowed. In order to facilitate construction, currently A jacking construction method has been widely used, but the diameters at both ends of the socket-type ductile iron pipe are inconsistent, which is not convenient for jacking. The invention adjusts the diameter of the outer wall to be consistent by coating the outer wall of the socket-type ductile iron pipe body with concrete , which is convenient for jacking construction. At the same time, flanges and ribs are set at the insertion end as load-bearing structures to solve the problem that the socket connection cannot directly bear large axial forces.

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