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Construction method for underpinning bridge pile foundation in mining method tunnel
The invention discloses a construction method for underpinning a bridge pile foundation in a mining method tunnel. The construction method includes the steps that S1, the tunnel is excavated to the position of the existing bridge pile foundation, and primary support is constructed; S2, a concrete and steel bar structure is adopted to serve as a second lining, during construction, secondary lining steel bars are manufactured and installed firstly, then a formwork is erected, concrete is poured, a hole is reserved in the section, connected with the bottom of the bridge pile foundation, of the second lining, and in the section where the top of the bridge pile foundation is connected with the second lining, annular reinforcing steel bars and longitudinal reinforcing steel bars penetrate through hole channels in the top of the bridge pile foundation; and S3, after the second lining reaches the design strength, the bridge pile foundation in the tunnel is cut off, then the second lining is closed into a ring, and pile foundation underpinning is completed. According to the construction method for underpinning the bridge pile foundation in the mining method tunnel, an existing bridge pile is effectively connected with the secondary lining of the tunnel, and then the bearing capacity of the bridge pile is underpinned to the secondary lining of the tunnel, so that new bearing piles do not need to be driven into the two sides of the underpinned pile foundation, underpinning beams do not need to be connected with bearing piles, and the method has the advantages of being advanced in theory, capable of saving cost, short in construction period, environmentally friendly and the like.
本发明公开一种矿山法隧道内桥梁桩基托换施工方法，包括以下步骤：S1、将隧道开挖至既有桥梁桩基处，并施作初期支护；S2、采用混凝土加钢筋结构施作二衬；施工时，先制作安装二衬钢筋，随后支设模板并浇筑混凝土；所述二衬与桥梁桩基底部连接的区段预留设有孔洞；所述桥梁桩基顶部与二衬连接的区段内，环向钢筋和纵向钢筋均穿过桥梁桩基顶部的孔道；S3、待二衬达到设计强度后，割除隧道内的桥梁桩基，随后将二衬封闭成环，完成桩基托换。本发明是将既有桥桩与隧道的二衬有效连接，进而将桥桩的承载力托换到隧道的二衬上，无需在被托换桩基的两侧打入新的承载桩并在其上连接托换梁，具有理论先进、节约成本、施工周期快且环保等优点。
Construction method for underpinning bridge pile foundation in mining method tunnel
The invention discloses a construction method for underpinning a bridge pile foundation in a mining method tunnel. The construction method includes the steps that S1, the tunnel is excavated to the position of the existing bridge pile foundation, and primary support is constructed; S2, a concrete and steel bar structure is adopted to serve as a second lining, during construction, secondary lining steel bars are manufactured and installed firstly, then a formwork is erected, concrete is poured, a hole is reserved in the section, connected with the bottom of the bridge pile foundation, of the second lining, and in the section where the top of the bridge pile foundation is connected with the second lining, annular reinforcing steel bars and longitudinal reinforcing steel bars penetrate through hole channels in the top of the bridge pile foundation; and S3, after the second lining reaches the design strength, the bridge pile foundation in the tunnel is cut off, then the second lining is closed into a ring, and pile foundation underpinning is completed. According to the construction method for underpinning the bridge pile foundation in the mining method tunnel, an existing bridge pile is effectively connected with the secondary lining of the tunnel, and then the bearing capacity of the bridge pile is underpinned to the secondary lining of the tunnel, so that new bearing piles do not need to be driven into the two sides of the underpinned pile foundation, underpinning beams do not need to be connected with bearing piles, and the method has the advantages of being advanced in theory, capable of saving cost, short in construction period, environmentally friendly and the like.
本发明公开一种矿山法隧道内桥梁桩基托换施工方法，包括以下步骤：S1、将隧道开挖至既有桥梁桩基处，并施作初期支护；S2、采用混凝土加钢筋结构施作二衬；施工时，先制作安装二衬钢筋，随后支设模板并浇筑混凝土；所述二衬与桥梁桩基底部连接的区段预留设有孔洞；所述桥梁桩基顶部与二衬连接的区段内，环向钢筋和纵向钢筋均穿过桥梁桩基顶部的孔道；S3、待二衬达到设计强度后，割除隧道内的桥梁桩基，随后将二衬封闭成环，完成桩基托换。本发明是将既有桥桩与隧道的二衬有效连接，进而将桥桩的承载力托换到隧道的二衬上，无需在被托换桩基的两侧打入新的承载桩并在其上连接托换梁，具有理论先进、节约成本、施工周期快且环保等优点。
Construction method for underpinning bridge pile foundation in mining method tunnel
一种矿山法隧道内桥梁桩基托换施工方法
HUANG SHENGGEN (author) / LIU ZHISEN (author) / XIANG LILIANG (author) / LIN SHANGYUE (author) / REN FUGUO (author) / WEI PENGCHENG (author) / HU JING (author)
2021-06-15
Patent
Electronic Resource
Chinese
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