Construction method for strengthening arch foot crack of stone arch bridge

Abstract

The invention discloses a construction method for strengthening an arch foot crack of a stone arch bridge, which comprises the following steps: 1, drilling hole around the arch foot crack of the stone arch bridge, and embedding steel bars into the holes; 2, mounting a plurality of transverse steel bar hoops on an arch ring to encircle the arch ring; 3, inserting wedges into the transverse steel bar hoops to apply ambient pressure to the arch ring; 4, arranging a longitudinal arch back steel bar and a longitudinal arch web steel bar on an arch back and an arch web of the arch ring respectively, and mutually firmly welding the arch back steel bar and the arch web steel bar and the intersections of the transverse steel bar hoops or the embedded steel bars; and 5, inserting the arch back steel bar and the arch web steel bar into a bridge pier to be firmly connected, or arranging the steel bars at the transverse plane of an abutment of the bridge pier to be firmly connected with the abutment. The construction method can enhance the stress strength of the arch ring and improve the stress structure thereof by applying the ambient pressure to the crack of a part to be strengthened and the arch ring, effectively prevent the crack from continuously enlarging, and connect a strengthening body, a strengthened body and a base into a whole to improve the capacity of resisting dynamic load shock, and has the advantages of simple and convenient field construction and low strengthening cost.

Description

technical field [0001] The invention relates to a reinforcement construction method after cracks are generated in buildings, in particular to a reinforcement construction method for broken arch feet of stone arch bridges. Background technique [0002] Stone arch bridges are bridges built on rivers and deep ditches using stone and other materials. Due to the limitations of construction methods, technologies and materials, from ancient China to modern times, most of the bridges built on rivers and deep ditches are stone arch bridges. In the long-term use process, due to factors such as self-weathering, large load-bearing, crustal movement, and geological changes, the arch feet, piers, and bridge body of the stone arch bridge are prone to large and small cracks, which leads to its safety performance. If it becomes a dangerous bridge and cannot be used normally, it needs to be reinforced. [0003] And in the prior art, the method that the arch foot fracture of stone arch bridge...

AI Technical Summary

Problems solved by technology

In the long-term use process, due to factors such as self-weathering, large load-bearing, crustal movement, and geological changes, the arch feet, piers, and bridge body of the stone arch bridge are prone to large and small cracks, which leads to its safety performance. If it becomes a dangerous bridge and cannot be used normally, it needs to be reinforced

[0003] And in the prior art, the method that the arch foot fracture of stone arch bridge is carried out reinforcement processing mainly contains following three kinds, 1, the processing method of buttress at arch foot rupture place; This kind method can increase the cross-sectional area of ​​arch foot section, It can improve the stress structure of the arch foot, but its main deficiency is that the connection between the pier and the original arch ring is not firm, and it will fail after a long time, and the reinforcement effect on cracks is poor

2. The treatment method of pasting one or two layers of steel mesh on the bottom of the arch foot rupture; this method cannot apply a confining pressure to the crack, and the crack will continue to expand, which cannot prevent the crack from expanding

3. The treatment method of pouring mortar into the crack; this method does not significantly enhance the overall strength of the rock, and the reinforcement effect is poor

The prior art method of strengthening the broken arch feet of stone arch bridges cannot meet the needs of construction, especially for ancient stone arch bridges with historical value and cultural relic value, which cannot be simply demolished and rebuilt, and a simple and practical reinforcement effect is needed. Construction method for cracked reinforcement of arch foot of stone arch bridge which is better and can effectively prevent cracks from expanding

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