Road-bridge transition section structure of high-grade highway suitable for short construction period condition in cold region

Abstract

The invention relates to a road-bridge transition section structure of a high-grade highway suitable for a short construction period condition in a cold region, and belongs to the field of highway construction. The road-bridge transition section structure comprises a bridge abutment and a roadbed, wherein a bridge is arranged on one side of the bridge abutment; the other side is connected with a highway through the roadbed, namely the roadbed is arranged on the highway side of the bridge abutment; and the roadbed comprises a foundation, a soil matrix, a pavement structure layer and a butt strap. The road-bridge transition section structure is characterized in that the foundation is lower than the base of the bridge abutment; the top surface of the foundation is flush with the bottom surface of the base of the bridge abutment; the soil matrix is arranged on the roadbed; the pavement structure layer is arranged on the soil matrix; the butt strap is embedded into the pavement structure layer; and the upper plane of the butt strap is flush with the pavement of the pavement structure layer. According to the road-bridge transition section structure, the jumping phenomenon which is easily generated when a car passes through the highway bridgehead in the cold region is solved; the driving safety of the car is improved; the operational performance of the high-grade highway is improved; and the service life of the high-grade highway is prolonged.

Description

technical field [0001] The invention relates to a road structure, in particular to a high-grade road bridge transition section structure suitable for short construction periods in cold regions, and belongs to the field of road construction. Background technique [0002] Since the reform and opening up, my country's highway construction has achieved rapid development. By the end of 2013, the total mileage of national highways had reached 4.3562 million kilometers, of which 104,400 kilometers were highways, 524,400 kilometers were secondary and above roads, and road bridges reached 713,000 seats and 36.63 million meters, 70% of the country's land area is seasonally frozen areas. Affected by seasonal changes, the freeze-thaw phenomenon is obvious. Slurry and frost heaving are the most common diseases of the roadbed and pavement structure in this area. At the same time, concrete freeze-thaw damage is often It is manifested in two aspects: frost heaving cracking and salt freezing d...

AI Technical Summary

Problems solved by technology

Due to the difficulty in the rolling construction of the embankment fill at the transitional section of the road and bridge, it is difficult to achieve the compactness of the rolling compaction. When the slab was just built, it was evenly supported under it. However, after the opening to traffic, the subgrade gradually sank and deformed, causing the slab at the bridge head to separate from the subgrade. , at the same time, the supporting surface drops in the form of voiding, and the low-temperature environment in the cold region causes low-temperature embrittlement of the strapping plate. When a heavy-duty vehicle exerts a dynamic load on it, the strapping plate and the road slab become unevenly supported, and the stress accumulates on the strapping plate. At the bottom of the slab at the point of maximum settlement in the empty area, when the stress accumulation exceeds the allowable value of the bending and tensile stress, the slab will begin to break

[0008] These settlements cause the road surface to form steps or produce significant longitudinal slope changes. When a high-speed vehicle passes by, it will cause bumps and jumps, that is, jumping, and this jump will not only affect the comfort of the driver and passengers. In severe cases, it will cause vehicle instability , and even cause traffic accidents, but also shorten the service life of the bridge passage, increase the repair and maintenance costs of the bridge

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