Protection method for local scouring of bridge pier

Abstract

The invention discloses a protection method for local scouring of a bridge pier. The protection method comprises the following steps that S1, the reinforcing depth H of the bridge pier to be reinforced is determined; S2, the outer edge line of a reinforcing area on the peripheral side of the bridge pier to be reinforced is determined; S3, grouting reinforcement is conducted on the reinforcing area; S4, riprap is laid around the bridge pier, and the outer contour line and the thickness of the riprap defined by the riprap are determined; and S5, the pit scouring state and the riprap state of thereinforcing area are detected regularly, when the area to be repaired is determined, the type of the area to be repaired is judged, when the generated new pit scouring depth reaches the set proportion of the reinforcing depth H, grouting repair is conducted on a pit again according to the step S1-S3, and when the riprap is insufficient in thickness and / or the area defined by the outer contour line of the riprap is insufficient in the set proportion, the riprap is filled again according to the step S4. According to the protection method for local scouring of the bridge pier, damage to the reinforcing area during river scouring can be reduced, regular inspection is achieved, adaptive repair is conducted when a problem occurs, and therefore the service life of the bridge pier is prolonged.

Description

technical field [0001] The invention relates to the technical field of bridge pier protection, in particular to a protection method for partial scour of bridge piers. Background technique [0002] There are countless rural road bridges in mountainous areas that have been completed, under construction, and planned in the future. However, the erosion of rivers in mountainous areas is one of the main reasons for the damage of the lower parts of road bridges; The scouring of the river will damage the bridge piers and hollow out the bridge foundation, which will greatly reduce the bearing capacity of the bridge substructure. In severe cases, it will lead to the inclination of the piers or the collapse of the bridge. Therefore, local scour protection of bridges in mountainous areas is particularly necessary. [0003] The principle of local scour protection for bridge piers includes the following two categories, one is solid anti-scour protection, which refers to placing some soli...

AI Technical Summary

Problems solved by technology

[0004] At present, traditional bridge foundation erosion protection is mostly one-time protection, that is, protection is carried out during construction. However, due to the steep rise and fall of water level in mountainous rivers during the flood season, large flood flow and strong scouring capacity, uncertain factors such as hydrology and geology Under the influence of the impact, the designed anti-scour measures of bridge piers are often damaged before the expiration of the operation period, which brings great hidden dangers to the safe operation of the bridge.

For example, Fushun Nanzamu was destroyed by floods in 2005. The bridge was built in 1976 and has not yet reached the standard service life; in 2006, the Xiongyue Bridge in Yingkou, Liaoning was destroyed by floods, two piers were washed away, and the bridge has not yet reached its use Years: In 2010, Luoyang Luanchuan Tangying Bridge collapsed due to flash floods caused by heavy rain during its service life

[0005] The existing anti-scour protection methods for bridge foundations located in the covering layer mostly use riprap protection, expanded pier foundation protection, or pile protection in front of the pier body. The riprap protection and expanded pier foundation protection are not suitable for water flow too fast, and the front row of pier body Pile protection is not suitable for moving bed scouring, and the scouring of rivers in mountainous areas has the characteristics of fast flow rate, steep rise and fall, and is typical of moving bed scouring. Protection is very prone to erosion damage in mountainous rivers

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