Method for reducing track construction settlement during construction of undercrossing existing railway

Abstract

The invention belongs to the technical field of the construction of undercrossing an existing railway by a tunnel, in particular relates to a method for reducing track construction settlement during construction of undercrossing an existing railway, and solves the defects of the traditional method for reducing construction settlement and disturbance of the existing operation railway. The method comprises the steps of: clearing railway ballast between two sleepers of the existing operation railway to form a square groove, placing square timber below the railway in the square groove, filling a gap between the railway and the square timber by using a cushion block, respectively placing a rigid distribution beam at two sides of the railway and between the two sides of the railway, and fixing the square distribution beam and the square timber. The method has the beneficial effects that a train load is effectively distributed by using the rigid distribution beam system, thus the stress concentration degree and the sensitive degree to the construction disturbance are greatly reduced, the settlement of the railway is greatly lowered, normal passing of a train is effectively ensured; and meanwhile, a grouting reinforcement method is replaced with a physical reinforcement method, thus the settlement reducing effect is remarkably improved, the construction cost is greatly saved, and the construction period is effectively saved.

Description

technical field [0001] The invention belongs to the technical field of construction of tunnels passing under existing railways, and in particular relates to a method for reducing track construction settlement during construction of tunnels passing under existing railways. Background technique [0002] The existing method to reduce the construction settlement and disturbance of the existing operating track is: chemical grouting reinforcement stratum method, that is, to carry out grouting reinforcement in advance on the existing railway subgrade stratum and the stratum within a certain range below to improve the soil quality. parameters, so as to reduce the construction settlement and disturbance caused by tunnels and other buildings passing under or adjacent to the construction process. However, the grouting reinforcement method has many disadvantages: First, the grouting reinforcement construction itself will cause disturbance and settlement to the existing subgrade, especia...

AI Technical Summary

Problems solved by technology

However, the grouting reinforcement method has many disadvantages: First, the grouting reinforcement construction itself will cause disturbance and settlement to the existing subgrade, especially in the loess area, where the collapsibility of the loess is very obvious, and the grouting construction itself will cause large settlement. The method of grouting reinforcement is limited; secondly, large-area grouting reinforcement will bring more difficulties to subsequent construction, and the soil parameters will increase in a large area, making excavation difficult. Under the condition that blasting construction is not allowed, the construction progress is slow and the excavation construction difficulties

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