Structure and construction method of junction position of bridge abutment and roadbed

Abstract

The invention discloses a structure and a construction method of a junction position of a bridge abutment and a subgrade. The structure of the junction position of the bridge abutment and the subgrade comprises a soil body subgrade (5), concrete pavement (6), and a bridge abutment (4). The soil body subgrade (5) is connected with the back of the bridge abutment (4), ear-walls are arranged at the back of an abutment body (2), and an abutment back (10) is formed by the soil body subgrade (5) between the two ear-walls, horizontal steel bars (9), and concrete. Length-degressive thin wall tubular piles (11) and length and density degressive soil nails (12) are arranged in the soil body subgrade (5) which extends from the abutment back (10) along the length direction of the concrete pavement (6). The construction method of the junction position of the bridge abutment and the subgrade includes the critical steps of fixing the horizontal steel bars (9) on steel frame of the abutment body (2) and ear-wall steel bar cage, and nailing length-degressive thin wall tubular piles (11) and soil nails (12) into the soil body subgrade (5). With the structure and the construction method of the junction position of the bridge abutment and the subgrade, vehicle dumping can be avoided.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a structure and a construction method of a joint between an abutment and a subgrade of a bridge. Background technique [0002] The abutment of a bridge refers to the supporting superstructure located at both ends of the bridge and connected to the roadbed and the structure that bears the filling pressure on the back of the abutment (that is, the side away from the river). In addition to transferring the load of the bridge superstructure to the foundation, its function also has the functions of resisting the filling pressure on the back of the abutment, stabilizing the subgrade at the bridge head, and making the bridge deck and road surface reliably and smoothly connected. [0003] The structure of the joint between the abutment and the roadbed of the bridge in the prior art is as follows: the abutment includes an abutment cap, an abutment body and a concrete foundation...

AI Technical Summary

Problems solved by technology

[0005] The structure of the bridge abutment and subgrade junction of the bridge constructed by the prior art construction method has the following defects: because the abutment is a rigid abutment, the rigidity is large, and the subgrade, especially the subgrade in soft soil, has a small rigidity. Like this, the rigid abutment There is a sudden change in stiffness between the bridge deck and the roadbed. Under the force of the vehicle, both the bridge deck and the road surface will produce a certain settlement deformation, and the sudden change in stiffness will cause a large difference in the settlement deformation range of the bridge deck and the road surface, resulting in a gap between the two. There is a large height difference between them. In layman's terms, the bridge deck has less settlement and the road surface has more settlement. The height difference makes a step between the two, causing the vehicle to jump over the bridge when passing through this position, which directly affects the comfort and safety of driving.

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