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...

Examples

Embodiment 1

[0046] This embodiment takes a bridge in a mountainous area in Anhui Province as an example. The bridge pier to be reinforced also includes an enlarged foundation 3 arranged under the pier body 2. The central axis of the enlarged foundation 3 coincides with the central axis of the pier body 2, and the enlarged foundation The area of ​​the upper surface of 3 is larger than the area of ​​the pier body 2 and the surface in contact with it; the pier body 2 and the enlarged foundation 3 are both rectangular. Since the bridge is located in a mountainous area, the flood season surges and falls, scouring the river bed surface 1, and the scouring force is extremely strong. After inspection, it was found that the local scouring depth of the bridge was close to the buried depth of the expanded foundation 3. According to a protection method for partial scouring of bridge piers, the specific steps are as follows:

[0047] S1. Determine the reinforcement depth H of the pier to be reinforced ...

Embodiment 2

[0063] This embodiment takes a bridge in a mountainous area of ​​Guangxi Province as an example. The bridge pier to be reinforced also includes an enlarged foundation 3 arranged below the pier body 2. The central axis of the enlarged foundation 3 coincides with the central axis of the pier body 2, and the enlarged foundation The area of ​​the upper surface of 3 is greater than the area of ​​the surface in contact with the pier body 2; wherein the pier body 2 is cylindrical with a diameter of 2.5m, the enlarged foundation 3 is square, and the riverbed is mainly cohesive soil. Affected by the flood, the bridge pier has severe local erosion. According to a protection method for the partial erosion of the bridge pier, the specific steps are as follows:

[0064] S1. Determine the reinforcement depth H of the pier to be reinforced according to the depth h of the scoured pit, such as figure 1 and image 3 As shown, the specific steps are as follows:

[0065] S11, determine the pit ...

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...

Examples

Embodiment 1

[0046] This embodiment takes a bridge in a mountainous area in Anhui Province as an example. The bridge pier to be reinforced also includes an enlarged foundation 3 arranged under the pier body 2. The central axis of the enlarged foundation 3 coincides with the central axis of the pier body 2, and the enlarged foundation The area of ​​the upper surface of 3 is larger than the area of ​​the pier body 2 and the surface in contact with it; the pier body 2 and the enlarged foundation 3 are both rectangular. Since the bridge is located in a mountainous area, the flood season surges and falls, scouring the river bed surface 1, and the scouring force is extremely strong. After inspection, it was found that the local scouring depth of the bridge was close to the buried depth of the expanded foundation 3. According to a protection method for partial scouring of bridge piers, the specific steps are as follows:

[0047] S1. Determine the reinforcement depth H of the pier to be reinforced ...

Embodiment 2

[0063] This embodiment takes a bridge in a mountainous area of ​​Guangxi Province as an example. The bridge pier to be reinforced also includes an enlarged foundation 3 arranged below the pier body 2. The central axis of the enlarged foundation 3 coincides with the central axis of the pier body 2, and the enlarged foundation The area of ​​the upper surface of 3 is greater than the area of ​​the surface in contact with the pier body 2; wherein the pier body 2 is cylindrical with a diameter of 2.5m, the enlarged foundation 3 is square, and the riverbed is mainly cohesive soil. Affected by the flood, the bridge pier has severe local erosion. According to a protection method for the partial erosion of the bridge pier, the specific steps are as follows:

[0064] S1. Determine the reinforcement depth H of the pier to be reinforced according to the depth h of the scoured pit, such as figure 1 and image 3 As shown, the specific steps are as follows:

[0065] S11, determine the pit ...

Images