US 12,146,281 B2
Throwing toughness buffer mesh unit for rockfall protection and design method of critical throwing angle thereof
Zhixiang Yu, Chengdu (CN); Lijun Zhang, Chengdu (CN); Liru Luo, Chengdu (CN); Yuntao Jin, Chengdu (CN); Lei Zhao, Chengdu (CN); Xin Qi, Chengdu (CN); and Shichun Zhao, Chengdu (CN)
Assigned to Southwest Jiaotong University, Chengdu (CN)
Filed by Southwest Jiaotong University, Chengdu (CN)
Filed on Mar. 15, 2021, as Appl. No. 17/200,924.
Claims priority of application No. 202011427186.0 (CN), filed on Dec. 9, 2020.
Prior Publication US 2022/0178093 A1, Jun. 9, 2022
Int. Cl. E01F 7/04 (2006.01)
CPC E01F 7/045 (2013.01) 16 Claims
OG exemplary drawing
 
1. A throwing toughness buffer mesh unit for a rockfall protection shed-tunnel, comprising:
cable columns, wherein each cable column of the cable columns is provided with a sliding device on a top end and connected to a foundation structure via a hinged support at a bottom;
support ropes, wherein each of the support ropes is connected to the sliding device on the each cable column in a sliding way and provided with a spring buffer on an end, wherein the spring buffer is obliquely anchored to a rock mass base near a protection structure;
a protection net, wherein the protection net is obliquely hung on the support ropes via a connector; and
a pavement inclination angle of the protection net is adjusted to a critical throwing angle θmin by adjusting a height difference between the cable columns to control a throwing track of a falling rock;
the critical throwing angle θmin is designed with following steps:
(1) estimating an ultimate deformation Δmax of a mesh under a vertical action;
(2) calculating a height difference Δh between an ultimate deformation point and a steel column;
(3) calculating a rebound height hg when rebounding to an edge of a system;
(4) checking whether throwing conditions are met; and
(5) repeating steps (1) to (4) to obtain the critical throwing angle θmin.