Reinforcement structure of damaged piers of Chengqiao Bridge with prestressed inclined rods to resist lateral forces

Abstract

The present invention discloses a reinforcement structure for a prestressed diagonal tie rod for resisting lateral force of a damaged pier of a city bridge, comprising a concrete foundation pedestal, a concrete pier, a prestressed diagonal tie rod for resisting lateral force, a steel pad, a removed area, a force conversion angle steel, a structural adhesive and an anchor rod; a concrete pier is arranged on the concrete foundation pedestal, and a plurality of prestressed diagonal tie rods for resisting lateral force are arranged at the column root of the concrete pier, and the rod body of the prestressed diagonal tie rod for resisting lateral force forms an angle of 45 degrees with the horizontal plane of the concrete foundation pedestal. The present invention only needs to remove part of the concrete protective layer of the pier, which is smaller than the area of ​​the original pier protective layer destroyed by the traditional reinforcement and repair method, thereby reducing the reinforcement and repair time, reducing the time and materials required for the restoration of the damaged bridge, and the speed is faster, and can also reduce the indirect economic losses caused by the long time of bridge repair.

Description

Technical Field

[0001] The invention relates to the field of engineering construction reinforcement, and in particular to a lateral force-resistant prestressed inclined-stayed rod reinforcement structure for a damaged pier of a city bridge. Background Art

[0002] The construction of urban bridges is increasing, and has become the lifeline of the rapid development of cities. In the actual use of bridges, many complex accidental disasters and emergencies will occur, which often cause damage to the bridge structure and affect or interrupt urban traffic. Therefore, in recent years, we have been committed to carrying out special work on the research of emergency assessment of urban bridge disaster damage and complete set of rapid reinforcement and repair technologies.

[0003] After a disaster occurs, engineers will quickly conduct a safety assessment of the bridge to determine whether the structure should continue to be used or whether it can be repaired and reinforced or repaired and rebuilt. The base of urban piers and columns is the area with the most damage, the heaviest damage, and the most important structural component that should be reinforced. However, there is no special reinforcement technology in the entire industry of civil structural engineering. The existing common reinforcement methods use dense stirrups or steel lattice reinforcement, which wastes materials and achieves poor reinforcement effects. In particular, the effect on improving lateral force resistance is not significant or there is no obvious enhancement of lateral force resistance. The reinforcement requires many processes and a long time. The present invention focuses on solving the shear resistance, lateral force resistance, and earthquake resistance of the column base, especially solving the fundamental defect of the oblique principal tensile stress at the column base, filling structural defects and gaps. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of conventional reinforcement methods in the prior art and to provide a lateral force-resistant prestressed inclined-stayed rod reinforcement structure for damaged piers of a city bridge.

[0005] The technical solution adopted by the present invention is: a reinforcement structure of a prestressed diagonal tie rod for resisting lateral force of a damaged pier column of a city bridge, comprising a concrete foundation cap, a concrete pier column, a prestressed diagonal tie rod for resisting lateral force, a steel pad, a removed area, a force conversion angle steel, a structural adhesive and an anchor rod;

[0006] The concrete foundation pedestal is provided with a concrete pier column, and the base of the concrete pier column is provided with a plurality of lateral force resisting prestressed inclined tie rods, and the rod body of the lateral force resisting prestressed inclined tie rod forms an angle of 45 degrees with the horizontal plane of the concrete foundation pedestal;

[0007] The upper end of the lateral force resisting prestressed inclined tie rod is welded and anchored with a steel plate, which is vertically arranged in the removed area of ​​the concrete protective layer of the concrete pier column and adhered to the concrete surface after the concrete protective layer is removed by structural adhesive, and the removed area is leveled with high-strength mortar;

[0008] The lower end of the lateral force resisting prestressed inclined tie rod is welded to the force conversion angle steel by tightening the thread pre-tightening, the force conversion angle steel is connected to the concrete pier column and anchored in the concrete cap by anchor rods, and the contact surface between the force conversion angle steel and the concrete foundation cap and the concrete pier column is provided with structural adhesive.

[0009] Preferably, at least one prestressed diagonal tie rod for resisting lateral force is arranged in the column of the concrete pier, and one prestressed diagonal tie rod for resisting lateral force is arranged on both sides or four sides of the concrete pier respectively. The number of tie rods in the column can also be appropriately increased according to the width of the pier. The horizontal spacing of the prestressed diagonal tie rods for resisting lateral force is not more than 50 cm.

[0010] Preferably, the lateral force resisting prestressed inclined tie rods can be arranged in multiple directions, and the strength of the lateral force resisting prestressed inclined tie rods is grade 2 steel.

[0011] Preferably, the thickness of the steel plate is more than 8 mm, the height of the steel plate is more than twice the length of the welded steel bar weld, the width of the steel plate is the same as the width of the concrete pier, and the strength of the steel plate is grade 2 steel.

[0012] Preferably, the flange of the force conversion angle steel is greater than 10 cm, the thickness of the force conversion angle steel is greater than 8 mm, both ends of the force conversion angle steel extend out of the concrete pier by 10 cm respectively, and the strength of the force conversion angle steel is grade 2 steel.

[0013] The construction method of the present invention:

[0014] First, remove the protective layer of the column corner and the pedestal surface, and find the height position of the steel pad according to the width of the column to remove the protective layer. Drill the holes in the diagonal tie column and slot the diagonal tie on the side of the column, and grind and paste the surface of the steel pad and the conversion angle steel. Install the diagonal tie, anchor the upper end of the diagonal tie to the steel pad, and install the conversion angle steel at the same time, apply prestress to the lower end of the diagonal tie, and weld the lower end of the diagonal tie. Inject the gap between the diagonal tie and the concrete pier column, and apply structural glue on the outer surface of the steel pad and the conversion angle steel. Finally, use high-strength mortar to fill the surface of the structure to complete it.

[0015] The structural reinforcement of the present invention is fast and efficient, with reasonable force and efficient force transmission, which can effectively prevent earthquake shear force horizontal load and various horizontal shear effects. The force of the oblique steel tie rod is clearer and more efficient, achieving the reinforcement effect. In addition, the actual calculation of the cross section of the tie rod should be greater than the sum of all horizontal shear forces and oblique principal tensile stresses.

[0016] Beneficial effects: The present invention only requires the removal of part of the pier column concrete protective layer, which is smaller than the area of ​​the original pier column protective layer destroyed by the traditional reinforcement and repair method, thereby reducing the reinforcement and repair time, reducing the time and materials required for the restoration of the damaged bridge, and being faster, and can also reduce the indirect economic losses caused by the long bridge repair time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 for Figure 1 AA section downward view. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] like Figure 1-2 As shown, a reinforcement structure of a prestressed diagonal tie rod for resisting lateral force of a damaged pier of a city bridge comprises a concrete foundation cap 1, a concrete pier 2, a prestressed diagonal tie rod for resisting lateral force 3, a steel pad 4, a removed area 5, a force conversion angle steel 6, a structural adhesive 7 and an anchor rod 8;

[0021] The concrete foundation pedestal 1 is provided with a concrete pier 2, and the base of the concrete pier 2 is provided with a plurality of lateral force resisting prestressed inclined tie rods 3, and the rod body of the lateral force resisting prestressed inclined tie rod 3 forms an angle of 45 degrees with the horizontal plane of the concrete foundation pedestal 1;

[0022] The upper end of the lateral force resisting prestressed inclined tie rod 3 is welded and anchored to the steel pad 4, which is vertically arranged in the removed area 5 of the concrete protective layer of the concrete pier 2 and is adhered to the concrete surface after the concrete protective layer is removed by structural adhesive 7, and the removed area 5 is leveled with high-strength mortar;

[0023] The lower end of the lateral force resisting prestressed inclined tie rod 3 is welded to the force conversion angle steel 6 by tightening the thread pre-tightening, the force conversion angle steel 6 is connected to the concrete pier 2 and anchored in the concrete foundation 1 by the anchor rod 8, and the contact surface between the force conversion angle steel 6 and the concrete foundation pedestal 1 and the concrete pier 2 is provided with structural adhesive 7.

[0024] At least one prestressed diagonal tie rod 3 for resisting lateral force is arranged in the column of the concrete pier 2, and one prestressed diagonal tie rod 3 for resisting lateral force is arranged on both sides of the concrete pier 2 respectively. The number of tie rods in the column can also be appropriately increased according to the width of the pier. The horizontal spacing of the prestressed diagonal tie rods 3 for resisting lateral force is not greater than 50 cm.

[0025] The lateral force resisting prestressed inclined tie rods 3 can be arranged in multiple directions, and the strength of the lateral force resisting prestressed inclined tie rods 3 is grade 2 steel.

[0026] The thickness of the steel plate 4 is more than 8 mm, the height of the steel plate 4 is more than twice the length of the welded steel bar weld, the width of the steel plate 4 is the same as the width of the concrete pier, and the strength of the steel plate 4 is Grade 2 steel.

[0027] The above is a detailed description of the implementation methods of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to the described implementation methods. For ordinary technicians in this field, within the scope of the principles and technical ideas of the present invention, various changes, modifications, substitutions and deformations of these implementation methods still fall within the protection scope of the present invention.

Claims

1. A prestressed inclined rod reinforcement structure for lateral force resistance of damaged piers of a city bridge, characterized in that: It includes concrete foundation cap, concrete pier, lateral force resisting prestressed inclined tie rod, steel pad, cut-out area, force conversion angle steel, structural adhesive and anchor rod; The concrete foundation pedestal is provided with a concrete pier column, and the base of the concrete pier column is provided with a plurality of lateral force resisting prestressed inclined tie rods, and the rod body of the lateral force resisting prestressed inclined tie rod forms an angle of 45 degrees with the horizontal plane of the concrete foundation pedestal; The upper end of the lateral force resisting prestressed inclined tie rod is welded and anchored with a steel plate, which is vertically arranged in the removed area of ​​the concrete protective layer of the concrete pier column and adhered to the concrete surface after the concrete protective layer is removed by structural adhesive, and the removed area is leveled with high-strength mortar; The lower end of the lateral force resisting prestressed inclined tie rod is welded to the force conversion angle steel by tightening the thread pre-tightening, the force conversion angle steel is connected to the concrete pier column and anchored in the concrete cap by anchor rods, and the contact surface between the force conversion angle steel and the concrete foundation cap and the concrete pier column is provided with structural adhesive; At least one lateral force resisting prestressed inclined tie rod is arranged in the column of the concrete pier column, and one lateral force resisting prestressed inclined tie rod is arranged on both sides or four sides of the concrete pier column respectively, and the horizontal spacing of the lateral force resisting prestressed inclined tie rods is not greater than 50 cm; The lateral force resisting prestressed inclined tie rod is arranged in two directions and four sides, and the strength of the lateral force resisting prestressed inclined tie rod is grade 2 steel; The thickness of the steel plate is more than 8 mm, the height of the steel plate is more than twice the length of the welded steel bar weld, the width of the steel plate is the same as the width of the concrete pier, and the strength of the steel plate is Grade 2 steel; The flange of the force conversion angle steel is greater than 10 cm, the thickness of the force conversion angle steel is greater than 8 mm, both ends of the force conversion angle steel extend out of the concrete pier by 10 cm respectively, and the strength of the force conversion angle steel is grade 2 steel.

Images