Micro-perturbation reinforcing structure for existing retaining wall of medium-low-speed magnetic levitation low set line

Abstract

The invention discloses a micro-perturbation reinforcing structure for an existing retaining wall of a medium-low-speed magnetic levitation low set line. The structure comprises a retaining wall structure, drainage holes, upwards-inclined drain holes and two horizontal and vertical displacement monitoring systems. The retaining wall structure comprises the existing retaining wall, a graded broken stone layer and a newly-built retaining wall, and the wall toe of the existing retaining wall is higher than that of the newly-built retaining wall; the drainage holes are formed in the retaining wall structure in a penetrating mode; the upwards-inclined drain holes are additionally formed in the existing retaining wall; one horizontal and vertical displacement monitoring system is arranged on a rail bearing beam, and the other horizontal and vertical displacement monitoring system is arranged on the wall top of the existing retaining wall. According to the micro-perturbation reinforcing structure, the new retaining wall is newly built on the outer side of the existing retaining wall, and therefore the existing retaining wall is prevented from being dismantled; in addition, sectional jumping excavation is performed when a foundation pit of the newly-built retaining wall is constructed, perturbation to a fill roadbed on the side face of the wall back and the rail bearing beam and a rail structure which are located on the fill roadbed is little, and the construction risk is little.

Description

technical field [0001] The invention belongs to the field of retaining wall reinforcement, and more specifically relates to a micro-disturbance reinforcement structure for existing retaining walls of low-speed and low-speed maglev lines. Background technique [0002] The embankment retaining wall built on the slope toe of the filled embankment for the medium-low speed maglev low-laying line may cause the upper filling embankment to lose its support and cause the upper part of the embankment to lose its support when deformation, cracking, etc. The lateral deformation and vertical uneven settlement of the rail beam will affect the flat, longitudinal and horizontal smoothness of the track structure above the rail bearing beam, reduce the ride comfort, and endanger the safe operation of the maglev train in severe cases. The method of demolition and reconstruction of the existing retaining wall can fundamentally solve this problem, but there are disadvantages such as long constru...

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Problems solved by technology

[0004] However, the retaining wall of the low-speed magnetic levitation line is generally built at the foot of the embankment fill slope. In the above-mentioned patent, since the filler is relatively loose soil, when the existing retaining wall side width reinforcement method is adopted, the long anchor rod passes through the existing retaining wall. With the retaining wall, it cannot be anchored and connected with the stable rock formation, and the stability of the overall structure after the new retaining wall cannot be guaranteed. At the same time, the bolt needs to be set with a long length to pass through the basic body of the road. During the construction process, the unavoidable disturbance of the fill subgrade and its upper part The rail-bearing beam and track structure; since the retaining wall is generally a rigid structure poured with concrete, chip concrete, etc., when short anchors are used to connect the existing retaining wall and the side width of the retaining wall, although the reinforcement structure and the The integrity of the existing retaining wall does not guarantee the uniformity of force between rigid structures, which may lead to local stress concentration on the side width part and cause new diseases; in addition, the side width part of the retaining wall is directly set on the outside of the existing retaining wall It will block the drainage channel of the existing retaining wall, make the drainage system of the existing retaining wall composed of reverse filter layer and weep hole invalid, and cause the filling behind the retaining wall to be soaked in water. The reduction of the strength of the filling in contact with water may affect the entire subgrade structure stability, which may endanger the safe operation of the train in severe cases

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