A Construction Method for Railway Waterproof Subgrade Structure in Coastal High Water Level Area

Abstract

The invention discloses a construction method for a railway waterproof subgrade structure in a coastal high water level area. The waterproof subgrade structure comprises a dredging and filling layer, a graded crushed stone filling layer, a waterproof layer and a waterproof protection layer successively laid from bottom to top. Layer, the waterproof layer includes the reinforced concrete roadbed groove poured on the top of the graded gravel joint layer, the inner and outer sides and bottom of the reinforced concrete roadbed groove are painted with asphalt waterproof layer and filled with graded gravel stable layer, the top The seal is sealed by an asphalt waterproof seal layer, and the waterproof protection layer includes an asphalt concrete layer and a graded crushed stone bottom ballast layer successively laid on the top of the asphalt waterproof seal layer, and sleepers and steel rails are laid on the graded crushed stone bottom ballast layer through ballast. The invention makes full use of the reinforced concrete rigid structure to meet the bearing capacity requirements of the railway subgrade, utilizes the waterproof characteristics of asphalt and asphalt concrete to achieve a good protection effect, has better integrity, stronger subgrade stability, and has the advantages of convenient construction, low cost and The advantages of a wide range of applications.

Description

technical field [0001] The invention relates to the technical field of railway subgrade waterproof construction, in particular to a construction method for a railway waterproof subgrade structure in a coastal high-water level area. Background technique [0002] The subgrade structure is the area most affected by train dynamic load, climate and environment (rainwater, surface water, groundwater and freeze-thaw), and it is required to have sufficient strength and rigidity. The graded crushed stone material used as roadbed filler can only provide sufficient bearing capacity and perform its function under the optimal moisture content state. Under the erosion and softening of water, it will gradually lose its function, affecting the comfort and safety of train operation. . Especially in the coastal environment, the primary soil is mostly muddy soil with insufficient bearing capacity, and the groundwater level is high. Under the action of tides, the groundwater level changes freq...

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Problems solved by technology

The graded crushed stone material used as roadbed filler can only provide sufficient bearing capacity and perform its function under the optimal moisture content state. Under the erosion and softening of water, it will gradually lose its function, affecting the comfort and safety of train operation.

Especially in the coastal environment, the primary soil is mostly muddy soil with insufficient bearing capacity, and the groundwater level is high. Under the action of tides, the groundwater level changes frequently. The high salinity and frequent changes of the groundwater can easily cause damage to the subgrade structure. How to avoid The impact of groundwater in coastal areas on the structure of railway subgrades, ensuring the safety of railway operations, is a difficult point in the design of subgrade structures for coastal railways

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