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

                                                                                                            旋挖工法使用靜態泥漿的特點

                                                                                                            旋挖工法使用靜態泥漿的特點

                                                                                                            發布時間:2020-04-02 瀏覽次數:0 次

                                                                                                            旋挖鉆進所使用的泥漿與正反循環鉆進和沖擊回轉鉆進有顯著不同。

                                                                                                            泥漿護壁鉆樁圖片

                                                                                                            (1)泥漿在鉆孔內的運動狀態不同:

                                                                                                            旋挖鉆進用泥漿在孔內基本上是靜態的。但局部在鉆斗和鉆桿的回轉帶動下形成環流,而當鉆具在提升和下降過程中鉆斗帶動泥漿作局部上升和下降運動。

                                                                                                            (2)泥漿被鉆渣污染的程度不同:

                                                                                                            旋挖鉆進切削破土方式屬于大體積切削,鉆渣的粒徑與數量不是以研磨方式進入泥漿而鉆渣對泥漿性能影響較少。

                                                                                                            (3)排渣方式不同:

                                                                                                            旋挖鉆進排渣是通過切削機械切下的土塊被擠入裝載機構(圓柱形鉆筒)被直接提至孔外卸渣,而不是依賴泥漿的流動把鉆渣運送到孔外,待沉淀處理后再返回孔內回收利用。又把旋挖機的鉆進排渣稱為間斷排渣。

                                                                                                            (4)使用泥漿的目的和用途不同:

                                                                                                            由于旋挖泥漿非全孔流動攜帶運送鉆渣,因此,泥漿配制中對懸浮鉆渣的能力要求很高,要求泥漿的切力要高,結構黏度要適當,但能保持和維持鉆孔是相同的,主要依賴rH平衡地壓與地下水壓力(調節r或H,或兩者同時調節,滿足平衡地層壓力保護鉆孔孔壁的要求)。

                                                                                                            (5)清孔方法的不同:

                                                                                                            由于旋挖工法采用靜態泥漿的特點,若用循環方式的清孔方法勢必導致工序和設備配套增加,因此新的適合旋挖工法的清孔方法誕生了。

                                                                                                            (6)對泥漿性能參數要求重點不同:

                                                                                                            旋挖機工法由于本身產生的鉆渣較少,特點是研磨顆粒較少,只要將細粒鉆渣懸浮在泥漿中數小時不沉淀就能滿足孔底沉淀達到國家標準的要求。因此對泥漿的黏度和切力均有較高要求,而對比重、失水量則視地層情況而定,配制旋挖用泥漿要牢記上述不同點。

                                                                                                            調制旋挖泥漿圖片


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