Trenchless buried type high voltage power cable bellows

Abstract

The invention relates to a trenchless buried type high voltage power cable bellows which is characterized in that a raised ring part (3) is formed along the circumference of an outer wall (1) of the bellows, and a circumference formed by the closed raised ring part is concentric with that of a radial cross-section of the bellows; and a corresponding groove ring part (4) is formed on the inner wall (2) of the bellows along the shape of the raised ring part (3). According to the trenchless buried type high voltage power cable bellows provided by the invention, the ground is not needed to be excavated during buried construction, and the buried construction has no greater impact on city traffic and running. The trenchless buried type high voltage power cable bellows has favorable bendability and moderate ductility by adopting a gap formed between the raised ring part and the groove ring part and selecting a bellows body material. The trenchless buried type high voltage power cable bellows can be naturally bent to correspond to complicated and changeable paved lines under the condition that the paved lines are full of twists and turns. The coiled bellows occupies small area, which is beneficial to construction and transportation in a narrow environment. Meanwhile, welding points for connecting pipelines are not needed, and therefore, the entire quality of the pipelines is improved.

Description

technical field [0001] The present invention relates to the field of electric power cables, in particular, the present invention relates to a protective sleeve used for non-excavation buried high-voltage power cables, using the protective sleeve of high-voltage power cables of the present invention, it is not necessary to excavate as in the past On the ground, the high-voltage power cables can be buried underground. Background technique [0002] The construction and development of cities put forward higher requirements for laying cables underground. Due to the complexity and particularity of the urban environment, the non-excavation buried cable laying construction method has less impact on the urban environment and people's lives than other methods (such as the construction method of digging trenches and buried pipes), and is currently the best construction method for laying cables in cities , the protective sleeve requires performance requirements compatible with this con...

AI Technical Summary

Problems solved by technology

[0006] Secondly, in the case where the path of laying power cables is tortuous and circuitous, the MPP pipe with smooth inner and outer pipe walls, rigid insulation, and flat walls cannot be naturally bent to adapt to the complex and changeable laying lines, which limits its use environment;

[0007] Furthermore, MPP pipes stacked on the construction site occupy a large construction site, which is not conducive to construction in a narrow environment. At the same time, it also has a great impact on urban traffic and operation.

[0008] In addition, considering the tortuousness of transportation and laying lines, the length of MPP pipes is limited, and its maximum length is generally about 9 meters. In this way, long-distance laying cables need to be welded and connected by multiple MPP pipes, which not only increases the construction strength, but also this There are hidden dangers in the quality of this welding connection, which reduces the overall quality of the MPP pipe

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