Power transmission line recessed assembled cable trench and laying method thereof

Abstract

The invention relates to a cable trench structure laid on a power transmission line, in particular to a power transmission line recessed assembled cable trench and a laying method thereof. The cable trench is characterized in that the cable trench comprises plural trench bodies connected end to end successively; each trench body has a recessed cross section and comprises a bottom plate and two side plates; trench cable bearer pre-embedded members are pre-embedded into the inner sides of the two side plates and are vertical to the bottom plate; the front end face of each trench body is provided with a tenon, the rear end face of each trench body is provided with a mortise, the tenon is connected with the mortise on the rear end face of a previous trench body and the mortise is connected with the tenon on the front end face of a following trench body so that an end-to-end structure is formed; water-swellable rubber bars are pressed in gaps in the mortise joints; each trench body is fixedly connected with the previous and following trench bodies through plural single-head bolts. The cable trench decreases the work amount of construction, shortens a construction period, increases the efficiency of long-distance transportation, reduces construction cost, and is expanded in application range in transmission line projects.

Description

technical field [0001] The invention relates to a cable trench structure laid on power transmission lines, in particular to a concave assembled cable trench for power transmission lines and its laying method, which is especially suitable for narrow corridors, no on-site prefabrication, and tight construction schedules Transmission line works. Background technique [0002] Chinese patent 200810162805.0 provides a substation assembled cable trench and pavement method, with a horizontal overall "U" section structure, prefabricated in sections, and then spliced ​​on site, and basically all prefabricated on site, no need to consider long distances transportation and assembly process. This prefabricated and assembled cable trench body can greatly reduce the amount of construction work, shorten the construction period, improve construction efficiency and construction quality, and reduce construction costs. However, when this prefabricated substation is applied to power transmissi...

AI Technical Summary

Problems solved by technology

[0003] 1. In the substation, the section of the cable trench is not large, the total length of the trench in a substation is not much, and it can provide a wide construction site, so the method of on-site prefabrication and on-site assembly is often used, and factory prefabrication and long-distance transportation are not required. ; and in the power transmission line project, because the line mileage is long and the corridor limit value, so the site does not have the site conditions for the prefabricated ditch section, the patented technical solution cannot be directly applied

[0004] 2. The body of the cable trench in the substation is made of waterproof concrete. Although the longitudinal trenches are connected by socket-and-groove joints, and the waterproof function of the joints is not high, they can basically meet the engineering requirements in the substation.

However, for power transmission line projects, the environmental conditions around the trench are complex, most of them are urban areas with shallow groundwater levels, and the waterproof requirements are high, so the original interface method is no longer applicable

[0005] 3. Since the environment in the substation is quite different from that in the corridor of the power transmission line, the paving method of the cable trench in the substation cannot be applied to the cable trench paving project of the power transmission line

[0006] At present, the cable trenches of power transmission lines are constructed by on-site masonry, which is time-consuming and laborious, and it is difficult to meet the current engineering construction requirements

Images