A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Shield method for preventing water-rich stratified soft soil segment from extrusion cracking and preventing ground from subsidence
The invention provides a construction method of a water-rich stratified soft soil shield for preventing segment extrusion cracking and ground subsidence diseases, and belongs to the technical field ofshield construction. The construction method of the water-rich stratified soft soil shield for preventing the segment extrusion cracking and the ground subsidence diseases are provided, so that a shield is kept good, an auxiliary construction method is made well, when shield tunneling begins, balance between a pressure of a shield soil bin and a soil pressure of an excavation surface is adjusted,wherein shield thrust is controlled to be 1.1-1.2 times of a static soil pressure; during shield tunneling, a shield posture is controlled, meanwhile, a segment posture is adjusted to be consistent with a posture of a shield tunneling machine, and a jack acts on a segment center position; and after the segment is fixed through the jack, synchronous grouting is conducted while space excavation ina stratum by the shield, the stability and pumpability of synchronous grouting liquid behind a segment are controlled, a synchronous grouting volume rate is increased, the shield mud cake formation orshield shell mortar coagulation phenomenon in a construction process is effectively prevented through the method, and meanwhile, the ground subsidence diseases caused by a time difference of verticalacting force of the segment and the stratum are prevented.
本发明提供了一种富水分层软土盾构防止管片挤裂和地面下沉病害的施工方法，属于盾构施工技术领域，提供一种富水分层软土盾构防止管片挤裂和地面下沉病害的施工方法，保持盾构良好，做好辅助工法，盾构掘进开始时，调整盾构土仓压力与开挖面泥土压力平衡；其中，控制盾构推力为1.1～1.2倍静土压力；盾构掘进时，控制盾构姿态，同时调整管片姿态与盾构机姿态一致，使千斤顶作用管片中心位置；千斤顶固定管片后，盾构在地层开挖空间时同步注浆，控制管片后同步注浆液稳定性和可泵性，提高同步注浆体积率，该种方法，有效的预防了施工过程盾构结泥饼或盾壳砂浆凝结现象，同时也预防管片与地层上下作用力时间差问题导致地面下沉病害。
Shield method for preventing water-rich stratified soft soil segment from extrusion cracking and preventing ground from subsidence
The invention provides a construction method of a water-rich stratified soft soil shield for preventing segment extrusion cracking and ground subsidence diseases, and belongs to the technical field ofshield construction. The construction method of the water-rich stratified soft soil shield for preventing the segment extrusion cracking and the ground subsidence diseases are provided, so that a shield is kept good, an auxiliary construction method is made well, when shield tunneling begins, balance between a pressure of a shield soil bin and a soil pressure of an excavation surface is adjusted,wherein shield thrust is controlled to be 1.1-1.2 times of a static soil pressure; during shield tunneling, a shield posture is controlled, meanwhile, a segment posture is adjusted to be consistent with a posture of a shield tunneling machine, and a jack acts on a segment center position; and after the segment is fixed through the jack, synchronous grouting is conducted while space excavation ina stratum by the shield, the stability and pumpability of synchronous grouting liquid behind a segment are controlled, a synchronous grouting volume rate is increased, the shield mud cake formation orshield shell mortar coagulation phenomenon in a construction process is effectively prevented through the method, and meanwhile, the ground subsidence diseases caused by a time difference of verticalacting force of the segment and the stratum are prevented.
本发明提供了一种富水分层软土盾构防止管片挤裂和地面下沉病害的施工方法，属于盾构施工技术领域，提供一种富水分层软土盾构防止管片挤裂和地面下沉病害的施工方法，保持盾构良好，做好辅助工法，盾构掘进开始时，调整盾构土仓压力与开挖面泥土压力平衡；其中，控制盾构推力为1.1～1.2倍静土压力；盾构掘进时，控制盾构姿态，同时调整管片姿态与盾构机姿态一致，使千斤顶作用管片中心位置；千斤顶固定管片后，盾构在地层开挖空间时同步注浆，控制管片后同步注浆液稳定性和可泵性，提高同步注浆体积率，该种方法，有效的预防了施工过程盾构结泥饼或盾壳砂浆凝结现象，同时也预防管片与地层上下作用力时间差问题导致地面下沉病害。
Shield method for preventing water-rich stratified soft soil segment from extrusion cracking and preventing ground from subsidence
一种防止富水分层软土管片挤裂和地面下沉的盾构方法
ZHU HANHUA (author) / CHEN LIPING (author) / YING GUOGANG (author) / WEI XINJIANG (author) / WU ZHIJUN (author) / HE JIAYUAN (author) / CHEN DAN (author)
2020-12-04
Patent
Electronic Resource
Chinese
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