Dissipation structure and design method for debris flow prevention of bridge engineering

Abstract

The invention relates to civil engineering, and particularly relates to a dissipation structure and design method for debris flow prevention of bridge engineering. The dissipation structure comprisesa dissipation system and a blocking dam arranged on the upstream portion of a bridge. The dissipation system is arranged in a slope body on the side of a channel and comprises a draining hole, a dissipation cavity and a drainage and guide hole. One end of the draining hole communicates with a channel on the upstream portion of the blocking dam, the other end of the draining hole communicates withone end of the dissipation cavity, and the outlet axis direction of the end, communicating with the dissipation cavity, of the draining hole and the axial direction of the dissipation cavity are on different planes. The other end of the dissipation cavity communicates with the drainage and guide hole, the drainage and guide hole communicates with a channel on the downstream portion of the blockingdam, and a vent hole is formed above the dissipation cavity and is used for communicating the dissipation cavity with air. Multiple protruding structures are arranged on the inner wall of the dissipation cavity. The design method is used for designing the dissipation structure. A pier can be protected by dissipating debris flow kinetic energy, debris flow energy is directly dissipated from sources, repair and maintenance are convenient, and the bridge body structure is not influenced.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a dissipation structure and a design method for preventing and controlling debris flow in bridge engineering. Background technique [0002] When a bridge project suffers from the impact of debris such as debris flow, the huge scouring action may cause the pier to become unstable; alluvial deposits will cause the loss of bridge clearance, causing road interruption and damage. Especially in mountainous areas, geological disasters occur frequently, and the alluvial deposits have high energy and large volume, which will cause more damage to bridge piers. The current protective measures for bridge piers are mainly based on protective devices. [0003] For example, the Chinese utility model patent whose authorized announcement number is CN202347498U discloses a bridge pier protective device. Its structure is that an angular water diversion part and a water diversion part are respecti...

AI Technical Summary

Problems solved by technology

The essence of this device is to add a protective buffer layer on the water-facing surface of the concrete pier. The main shortcomings are: 1. Although the protective buffer layer can reduce the impact of alluvium on the pier, the alluvial fluid containing a large number of coarse particles flows from the side of the pier. Obsolete, there is an obvious abrasion problem of alluvial objects on the pier building materials, which is unfavorable for long-term use

2. The protective buffer layer is integrated with the pier design, and the maintenance and replacement costs are high

Images