Structure and construction process for reducing power impact response at back of seamless bridge abutment

Abstract

The invention discloses a structure and a construction process for reducing power impact response at the back of a seamless bridge abutment. A slab is buried in the filling at the back of an abutment and is integrally connected with a back wall. The top part of the buried slab is provided with a back filling layer to distribute part of impact load and reduce the impact effect on the slab. Cover soil in the length range of the buried slab and a soil body at the end of the slab together form a thick and long elastic body to absorb the expansion deformation of a girder body. By the structure and construction process for reducing power impact response at the back of the seamless bridge abutment, load of vehicles on the bridge is distributed, the direct effect impact of vehicles on the slab is decreased, and the slab can be prevented from breaking down. Because the slab bears part of overburden load, subsidiary stress on a lower soil matrix is reduced, post-construction settlement of the soil matrix is decreased, large bridge settlement difference of the bridge is avoided, the settlement of the transaction section of the seamless bridge is transformed from a sharp change to a gradual change, and bumping at bridgehead is avoided. Moreover, the seismic performance of the seamless bridge is improved. Therefore, the structure and the construction process for reducing power impact response at the back of the seamless bridge abutment are particularly applicable to integral seamless bridges.

Description

technical field [0001] The invention relates to a structure for reducing the dynamic impact response behind a seamless bridge abutment and a construction process thereof, which is particularly suitable for an integral abutment seamless bridge and belongs to the field of bridges. Background technique [0002] The transition section of the seamless bridge is the link between the abutment and the subgrade, and the stiffness of the two is different. Seamless bridges have higher requirements on the foundation. Generally, a solid support is required under the pier abutment, so that the settlement and displacement at the abutment can be ignored; while the stiffness of the road foundation itself is smaller than that of the bridge, the The soil foundation is generally loose and belongs to the flexible foundation. Under the same road surface weight and vehicle load, the dynamic response of the soil foundation is different, and the deformation that may occur over time is also different...

AI Technical Summary

Problems solved by technology

Seamless bridges have higher requirements on the foundation. Generally, a solid support is required under the pier abutment, so that the settlement and displacement at the abutment can be ignored; while the stiffness of the road subgrade itself is smaller than that of the bridge, the subgrade under the subgrade is less rigid than the bridge. The soil foundation is generally loose and belongs to the flexible foundation. Under the same road surface weight and vehicle load, the dynamic response of the soil foundation is different, and the deformation that may occur over time is also different. Flexible structures The settlement deformation is relatively large, which will inevitably cause the settlement difference on the transition section of the seamless bridge

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