Construction method for underground water road cutting for road in area along river during crossing underneath existing railway

Abstract

The invention discloses a construction method for an underground water road cutting for a road in an area along a river during crossing underneath existing railway. The method comprises steps as follows: a waterproof curtain is arranged by high-pressure rotary jet grouting piles in the original ground between the road and the river channel, and water in the river channel cannot perform convectivepenetration with the road cutting; a rotary drilling rig is adopted for drilling, and underwater concrete is poured; soil mass in front of the piles is reinforced by taking any one of composite foundation treatment measures of cement-mixed piles, multi-directional stirring cement mortar piles or CFG (cement flyash gravel) piles; excavation is performed and a hanging board is manufactured; drainageditches are excavated on two sides in the road cutting during excavation of the road cutting, water is collected to the low-lying section and underground water is drained to the outside of the road cutting by a water suction pump in a waterway drain manner; underground drainage systems such as longitudinal blind ditches and the like are constructed; a roadbed is subjected to replacement filling treatment and compaction. The construction method has beneficial effects as follows: the construction quality of the underground water road cutting in the area along the river is guaranteed, anchorageforce required by the design is provided by soil mass at anchorage sections of the double-row piles, stable roadbed slope and qualified road surface deflection are guaranteed, and the roadbed is prevented from being damaged by diseases.

Description

technical field [0001] The invention belongs to the technical field of subgrade construction when a road passes under an existing railway, and in particular relates to a construction method for an underground water cutting when a road passes under an existing railway along a river section. Background technique [0002] There are many rivers and lakes in our country, and the water system is developed. The drainage area is more than 1.8 million square kilometers, accounting for 18.8% of the total area of ​​the country. In a certain area on a plateau where rivers are most concentrated, there are dozens of major rivers. At present, most of the rivers have been set up as landscape rivers, and most of the landscape avenues along the river are embankments during the construction process. However, when passing through the existing railways, due to the influence of clearance, the actual problem that the groundwater level in the cuttings is higher than the design elevation of the road...

AI Technical Summary

Problems solved by technology

[0004] In order to meet the clearance requirements of the road under the railway, the underpass railway section is passed through in the form of a cutting groove, with a maximum excavation depth of 6.4m. The cutting at this site is a cutting of underground water along the river. If the conventional cutting construction method is adopted, it will be infiltrated by the constant flow of the river Coupled with the impact of weak soil, there will inevitably be engineering accidents such as cutting seepage, water accumulation, slope instability, piping and quicksand, which will affect the safe operation of existing railways.

Using conventional cutting construction methods, the above problems cannot be solved

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