Suspension protection construction method for high-voltage cable pipeline transversely penetrating through middle of large-span foundation pit

Abstract

The invention discloses a suspension protection construction method for a high-voltage cable pipeline transversely penetrating through the middle of a large-span foundation pit. The suspension protection construction method comprises the following steps that S1, a construction environment is surveyed; S2, foundation pit structure construction of the section not affected by the high-voltage cable pipeline is achieved; S3, lifting construction of the high-voltage cable pipeline is achieved; S4, laying and suspension construction of the high-voltage cable pipeline are achieved; S5, integrity protection construction of the high-voltage cable pipeline is carried out; and S6, underground main body structure construction is achieved. According to the suspension protection construction method for the high-voltage cable pipeline transversely penetrating through the middle of the large-span foundation pit, the high-voltage cable pipeline is arranged in a root division and segmentation manner that two ends are radiated and the middle is parallel, so that the suspension weight and span of the high-voltage cable pipeline can be reduced and shortened, and the safety and reliability of flexible suspension are improved; and meanwhile, underground existing structures such as inclined supporting beams, top beams and the like are assisted, bearing steel wire ropes are arranged in a short-span and long-span alternating and multi-row parallel mode so as to carry out flexible suspension on the high-voltage cable pipeline, the suspension weight can be evenly distributed on the inclined supporting beams, and therefore the suspension safety and stability are further improved.

Description

technical field [0001] The invention relates to the technical field of underground cable protection construction, in particular to a construction method for suspension protection of a high-voltage cable pipeline crossing the middle of a large-span foundation pit. Background technique [0002] In the construction of underground structures of urban rail transit stations, four YJV22-8.7 / 15kV-3×300mm cables with an underground depth of 7.0m are often encountered 2 And each 10kV hose-type high-voltage cable in the DN166 mm×8.0mm PE (polyethylene) cable protection tube traverses the middle of the foundation pit with a width of 53m and above and a depth of 10m. The excavation of the foundation pit and the construction of the main structure bring potential safety risks. [0003] Before the construction of underground structures, the 10kV hose-type high-voltage cables must be protected. In the prior art, most methods of line relocation, Bailey beam or I-beam or triangular steel tru...

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Problems solved by technology

However, the method disclosed in the above-mentioned prior art has the following problems: (1) the relocation workload is large, the construction period is long, the construction cost is high, land resources are wasted, vegetation is destroyed, land loss pollutes the surrounding environment, and the normal life of residents or businesses in the area is disturbed; (2) Small-span suspension is not suitable for large-span suspension construction with a width of 53m and above. It is necessary to construct vertical support columns in the middle of the foundation pit to support horizontal suspension beams, which is neither economical nor convenient. (3) The construction of cable-stayed suspension and suspension cable suspension is easy to be difficult to implement due to the space restriction of the construction site, the construction is difficult, the construction safety risk is high, the construction period is long, and the construction cost High disadvantage

[0004]At present, in China, there are very few protection constructions and prevention of electric shock and leakage for the 10kV hose-type high-voltage cables that traverse the middle of the foundation pit of the underground structure with a span of 53m or more Research

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