Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Long and narrow deep foundation pit supporting structure and long and narrow deep foundation pit construction method
The invention discloses a long and narrow deep foundation pit supporting structure and a long and narrow deep foundation pit construction method, belongs to the field of foundation pit excavation supporting, and aims to improve long and narrow deep foundation pit excavation supporting performance and reduce safety risks. The underground connecting wall is jointly formed by the connecting wall sections of the step foundation pits, the root of the connecting wall section located on the upper portion and the top of the connecting wall section located on the lower portion between every two adjacent connecting wall sections are engaged, and the pre-pressing springback anchor rods penetrate through the engaged portions of the two adjacent connecting wall sections at the same time for anchoring. During construction, the anchor bar piles are driven for pre-supporting in advance, then the corresponding step foundation pit is excavated, and wall connecting section construction is completed; and finally, a pre-pressing springback anchor rod is hit into the position between the wall connecting section to be constructed and the adjacent upper wall connecting section. The principle that supporting is conducted firstly, then excavation is conducted, and supporting is reinforced while excavation is conducted is fundamentally achieved, the instability phenomenon caused by the fact that the exposure time of a free face is too long after a foundation pit is excavated is avoided, the pre-pressing value of the supporting wall face is increased through the pre-pressing springback anchor rods, and then the stability of underground continuous wall supporting is improved.
本发明狭长深基坑支护结构及狭长深基坑施工方法，属于基坑开挖支护领域，目的是提高狭长深基坑开挖支护性能，降低安全风险。由各阶台阶基坑的连墙节段共同构成地下连墙，且相邻两阶连墙节段之间，位于上方的连墙节段的根部与下方的连墙节段的顶部咬合，并通过预压回弹锚杆同时穿过相邻两阶连墙节段的咬合部分进行锚固。施工时，打入锚筋桩进行提前预支护，再开挖对应台阶基坑，并完成连墙节段施工；最后，正施工的连墙节段与相邻上部连墙节段之间打入预压回弹锚杆。从根本上实现了“先支护后开挖、边开挖边加强支护”的原则，避免因基坑开挖后临空面暴漏时间过长而出现失稳现象，预压回弹锚杆增加支护壁面的预压值，进而提高地下连墙支护的稳定性。
Long and narrow deep foundation pit supporting structure and long and narrow deep foundation pit construction method
The invention discloses a long and narrow deep foundation pit supporting structure and a long and narrow deep foundation pit construction method, belongs to the field of foundation pit excavation supporting, and aims to improve long and narrow deep foundation pit excavation supporting performance and reduce safety risks. The underground connecting wall is jointly formed by the connecting wall sections of the step foundation pits, the root of the connecting wall section located on the upper portion and the top of the connecting wall section located on the lower portion between every two adjacent connecting wall sections are engaged, and the pre-pressing springback anchor rods penetrate through the engaged portions of the two adjacent connecting wall sections at the same time for anchoring. During construction, the anchor bar piles are driven for pre-supporting in advance, then the corresponding step foundation pit is excavated, and wall connecting section construction is completed; and finally, a pre-pressing springback anchor rod is hit into the position between the wall connecting section to be constructed and the adjacent upper wall connecting section. The principle that supporting is conducted firstly, then excavation is conducted, and supporting is reinforced while excavation is conducted is fundamentally achieved, the instability phenomenon caused by the fact that the exposure time of a free face is too long after a foundation pit is excavated is avoided, the pre-pressing value of the supporting wall face is increased through the pre-pressing springback anchor rods, and then the stability of underground continuous wall supporting is improved.
本发明狭长深基坑支护结构及狭长深基坑施工方法，属于基坑开挖支护领域，目的是提高狭长深基坑开挖支护性能，降低安全风险。由各阶台阶基坑的连墙节段共同构成地下连墙，且相邻两阶连墙节段之间，位于上方的连墙节段的根部与下方的连墙节段的顶部咬合，并通过预压回弹锚杆同时穿过相邻两阶连墙节段的咬合部分进行锚固。施工时，打入锚筋桩进行提前预支护，再开挖对应台阶基坑，并完成连墙节段施工；最后，正施工的连墙节段与相邻上部连墙节段之间打入预压回弹锚杆。从根本上实现了“先支护后开挖、边开挖边加强支护”的原则，避免因基坑开挖后临空面暴漏时间过长而出现失稳现象，预压回弹锚杆增加支护壁面的预压值，进而提高地下连墙支护的稳定性。
Long and narrow deep foundation pit supporting structure and long and narrow deep foundation pit construction method
狭长深基坑支护结构及狭长深基坑施工方法
SUN CONGHUANG (Autor:in) / WANG MINGHUI (Autor:in) / LIANG PENG (Autor:in) / LU DINGQUAN (Autor:in)
04.07.2023
Patent
Elektronische Ressource
Chinesisch
IPC:
E02D
FOUNDATIONS
,
Gründungen
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