High-water-level loess stratum multi-track railway composite overhead system and construction method thereof

Abstract

The invention provides a high-water-level loess stratum multi-track railway composite overhead system and a construction method thereof. The high-water-level loess stratum multi-track railway composite overhead system comprises a plurality of temporary overhead piles arranged in the length direction of a multi-track line, wherein the temporary overhead piles are connected with a track of a multi-track through D-shaped auxiliary beams; waterproof curtains are arranged on the two sides of the track of the multi-track correspondingly; a working foundation pit is formed between the temporary overhead piles connected with the two adjacent rows of D-shaped auxiliary beams; dewatering wells are arranged on the two sides of the working foundation pit; and formal overhead piles are arranged in the working foundation pit and connected with the track of the multi-track through transverse lifting beams. The existing line is temporarily overhead by arranging the temporary overhead piles, the working foundation pit is excavated between the two adjacent rows of temporary overhead piles, regional dewatering is conducted, then the formal overhead piles are constructed, and the length of the formal overhead piles can be set according to the upper load so as to meet the bearing capacity. Through conversion from temporary overhead to formal overhead, the problems of construction bottlenecks of manual hole digging piles of a high-water-level loess stratum and limitation of the construction space of the multi-track railway are solved.

Description

technical field [0001] The invention belongs to the technical field of construction of existing operating railways passing under new roads, and in particular relates to a multi-strand railway composite overhead system in high-water level loess strata and a construction method thereof. Background technique [0002] my country's transportation network is gradually improving, and it is inevitable that new lines will pass under existing operating lines. In order to reduce the disturbance of new railways to existing operating lines and ensure the safety of existing operating lines, it is usually necessary to Carry out overhead. For sites with conventional strata and limited construction conditions, it is usually enough to use bored piles to elevate the existing lines, but there is no good solution for multi-strand railway lines with high water level loess strata and relatively large construction conditions. The construction method usually refers to the conventional construction m...

AI Technical Summary

Problems solved by technology

For sites with conventional strata and limited construction conditions, it is usually enough to use bored piles to elevate the existing lines, but there is no good solution for multi-strand railway lines with high water level loess strata and relatively large construction conditions. The construction method usually refers to the conventional construction method for overhead, but because large-scale construction machinery is not allowed to enter a certain area of ​​the operating railway, only the original manual excavation piles can be used, and manual excavation is very difficult to form holes in saturated soft loess below the groundwater level. Difficult to ensure the quality of piles, and even impossible to construct when the pile length is too long

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