A prefabricated short-slab floating ballast bed and its construction method

Abstract

The invention discloses a prefabricated short slab floating track bed and a construction method and belongs to a railway track bed. The prefabricated short slab floating track bed comprises floating slabs, heightening gaskets, shear hinges and elastic vibration isolators, wherein the elastic vibration isolators are arranged in preset through holes of each floating slab, a support stop block or a coupling sleeve provided with a support stop block is arranged on the inner wall of each preset through hole, each floating slab is supported on the elastic vibration isolators through the support stop blocks, an heightening gasket is arranged between each support stop block and the corresponding elastic vibration isolator, shear hinges are arranged between floating slabs, each floating slab is a prefabricated short slab with the length of 3-8 m, the elastic vibration isolators arranged at the two ends of each prefabricated short slab are respectively arranged on the inner sides of outermost buckles along the longitudinal direction of the steel rail, and the vertical rigidity of the elastic vibration isolators is at least 1.5 times the vertical rigidity of the elastic vibration isolators in other positions of each prefabricated shot slab. The prefabricated short slab floating track bed and the construction method realize the prefabricated production and hoisting construction of the floating slabs and guarantee the stability and safety of the floating track bed in the driving process by arranging the elastic vibration isolators with different vertical rigidities, and further, the construction speed is improved, the reduction of construction period is facilitated, the construction difficulty is reduced, and the production cost is saved.

Description

technical field [0001] The invention belongs to a railway track bed, and in particular relates to a track structure of a railway, which may specifically be a track bed of a railway, a subway, an urban railway, an elevated light rail, a high-speed railway, or the like. Background technique [0002] Vibration and noise are recognized as the most widely affected public hazards, and they are also a problem that needs to be solved urgently in the development of rail transit in recent years. Among the existing rail transit vibration and noise reduction technologies, the most successful practical application is the component floating technology, typically the floating ballast bed technology, which has high vibration isolation efficiency and stable working performance, which has become a consensus in the industry, such as patent No. It is a built-in floating ballast bed structure disclosed in Chinese patent ZL200410035441.1. However, the construction period of the existing floating...

AI Technical Summary

Problems solved by technology

However, the construction period of the existing floating ballast bed is generally long, the standard floating slab length is 25m, and the earliest construction speed in the tunnel can only achieve an average of 5m per working group per day; then Qingdao Geergu Company developed Steel cage construction technology, that is, the construction method of binding the steel cage on the ground first and then hoisting it into the tunnel for concrete pouring, which increases the daily work progress of each working group to about 30m

However, due to the large size of the steel cage, it is often necessary to open a special passage on the tunnel when transporting into the tunnel, which is very inconvenient. In addition, although the steel cage construction method has greatly improved the construction progress, it still cannot meet the construction period. Many subway vibration isolation sections were forced to abandon the use of floating ballast bed vibration isolation technology due to unsatisfactory construction schedules

At present, there are some high-efficiency prefabricated construction methods in other fields. For example, in the viaduct construction, the prefabricated bridge body in sections is generally used, and then the technical method of on-site hoisting and construction has significantly improved the construction speed. However, due to the limited space in the tunnel and the existing The carrying capacity of hoisting transport vehicles in the tunnel is limited. The traditional 25m-long floating slab cannot directly learn from the construction method of the elevated bridge. It is prefabricated on the ground and then hoisted into the tunnel. applied in construction

How to further increase the construction speed has become an industry problem that restricts the further promotion and application of floating ballast bed technology

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