







摘" 要:大型沉井工程周邊往往存在較多建筑物、構筑物,為了更好地控制沉井對周邊影響,沉井過程中需要進行實時監測,傳統的人工測量效率低且夜間測量效果不佳,為此開發一套沉井全自動監測系統,可對沉井姿態實時測量。結果表明,全自動監測系統可在數十天的過程中穩定運行,對沉井進行高精度的實時監測,針對實際工程提供實時高程、位移數據,為沉井下沉過程中提供準確的糾偏數據,以便達到良好的就位精度。
關鍵詞:自動化;監測系統;沉井;糾偏;姿態
中圖分類號:TU744" " " 文獻標志碼:A" " " " " 文章編號: 2095-2945(2024)25-0045-04
Abstract: There are often many buildings and structures around large-scale open caisson projects. In order to better control the influence of open caisson on the periphery, real-time monitoring is needed in the process of open caisson. The traditional manual measurement efficiency is low and the night measurement effect is not good. For this reason, a set of fully automatic monitoring system for open caisson is developed, which can measure the posture of open caisson in real time. The results show that the automatic monitoring system can run stably in the process of tens of days, carry out high-precision real-time monitoring of open caisson, provide real-time elevation and displacement data for practical engineering, and provide accurate deviation correction data for the process of caisson sinking, in order to achieve good positioning accuracy.
Keywords: automation; monitoring system; open caisson; correction; posture
沉井工程周邊往往存在變電站、塔吊等建筑物與構筑物,低層的永久建筑與高聳構筑物對地表變形較為敏感,且沉井結束時也需要精準地落入底部樁基礎之上,因此有必要對沉井施工過程中井身姿態進行實時監測[1-2]。沉井下沉期間禁止長時間停滯,一旦啟動就需要連續不間斷地進行測量,而傳統的人工測量方法在高空、夜間、長周期的作業環境下存在明顯的不足。因此,需要借助全自動監測系統[3-5],提高工程作業的精細化程度。
1" 工程概況
唐山LNG項目海水取排水工程沉井長36.4 m,寬34.15 m,總高度21.5 m,下沉前地面制作高度19.7 m,沉井刃腳設計標高-15.9 m,井壁和內長隔墻一次澆筑;內短隔墻為下沉后再進行二次澆筑,沉井結構如圖1所示。沉井范圍內土層以素填土、粉質黏土、粉土、淤泥質黏土、粉砂為主,靜止水位+2.20~+3.80 m。沉井采用排水下沉施工工藝[6-9],即抽取海水高壓沖入沉井結構底層土體,高壓水帶動土層從中心向四周排出泥渣,達到下沉目的,本工程工藝設備布置如圖2所示。……