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                                                                                                            山東滕州小型旋挖機廠家聯系電話圖片

                                                                                                            旋挖機鉆進施工共分幾個階段?

                                                                                                            旋挖機鉆進施工共分幾個階段?

                                                                                                            發布時間:2019-07-30 瀏覽次數:2 次

                                                                                                            旋挖機鉆進施工階段可大致分為埋設護筒、鉆機對中、鉆進成孔三個階段。
                                                                                                            (一)埋設護筒

                                                                                                            埋設護筒圖片埋設護筒是鉆孔灌注樁的必須工序,包括挖土、放護筒、周邊回填。護筒采用明挖埋設法:開挖前將樁中心引至開挖區外。護筒埋設時應認真檢查其平面位置及傾斜度,護筒底部和四周所填黏土必須分層夯實,并做好排水措施,可用錘擊、少壓或振動等方法下沉護筒,保護筒埋設牢固。最后把樁位交叉引到護筒中心校驗。
                                                                                                            護筒埋設還應滿足以下要求:
                                                                                                            1.護筒平面位置埋設準確(偏差不大于50mm);
                                                                                                            2.護筒頂面宜高出施工水位或地下水位2m,還應滿足孔內泥漿面的高度要求,護筒排漿口應高出地面0.2-0.3m;
                                                                                                            3.在旱地時還應高出施工地面0.5m;護筒底應低于施工最低水位0.1-0.3m;
                                                                                                            4.埋設護筒挖坑只需比護筒直徑大0.5-1.Om;
                                                                                                            5.護筒四周用黏土夯密實,護筒底必須在黏土層中,否則應填黏土并夯實,厚度不小于50cm。
                                                                                                            (二)鉆機對中
                                                                                                            護筒埋設完畢之后,旋挖機正式施工之前,要重新進行樁位中心點的對中操作。將鉆機移動至接近護筒位置后,通過微動調節變幅裝置,使旋挖機鉆頭中心點對中護筒中心位置。

                                                                                                            旋挖機施工現場(三)鉆進施工
                                                                                                            鉆機對中完畢之后,即可開始鉆進施工,施工中應嚴格遵守鉆機的施工流程,在鉆進過程中要注意以下事項:
                                                                                                            1.根據場地的地質情況,選擇合適的施工工藝以及施工設備,配置最優的鉆具組合;
                                                                                                            2.在不穩定地層鉆進時要控制好泥漿性能;
                                                                                                            3.土層鉆機時加壓不易過大,以免單次進尺量過大;
                                                                                                            4.巖層鉆進時要不定期地對設備進行維護保養,確保鉆進處在最佳的工作狀態,并且要及時修補鉆頭;
                                                                                                            5.大直徑巖層鉆進施工時,可采用分級鉆進的方式來提高施工效率;
                                                                                                            6.鉆進過程中出現鉆孔事故時,要及時處理,切勿長時間擱置,以免引發旋挖機事故。

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