原文：PRECEMENTATION OF DEEP SHAFTS
ABSTRACT
Precementation or pregrouting of deep shafts in South Africa is an established technique to improve safety and reduce water ingress during subsequent sinking of the shaft.
The recent completion of several precementation projects for shafts deeper than 1000m has again highlighted the effectiveness of pre¬grouting of shafts utilising deep hole slim hole wireline techniques for drilling and conventional deep hole grouting techniques for precementation.
Precementation of deep shafts will:
Increase the safety of the shaft-sinking operation
Minimise water and gas inflow during shaft sinking
Minimise the time lost due to additional grouting operations during sinking of the shaft and hence minimise costly delays and standing time of shaft sinking crews and equipment
Provide detailed information of the geology of the proposed shaft site. Information on anomalies, dykes, faults as well as reef (gold bearing conglomerates) intersections can be obtained from the eva luation of cores of the precementation boreholes.
This information is important for the mine as well as the shaft-sinking contractor.
Provide improved rock strength for excavations in the immediate vicinity of the shaft area.
The paper describes precementation techniques recently applied successfully from surface and some conclusions for further considerations.
翻譯：深井預(yù)注漿
摘要
南非深豎井預(yù)注漿是一項(xiàng)在掘進(jìn)中提高安全性并減少礦井進(jìn)水的成熟的技術(shù)。最近完成的幾個(gè)對(duì)超過(guò)1000米深的豎井預(yù)注漿項(xiàng)目再次表明了利用深孔小眼鉆井和注漿技術(shù)的成效。
深豎井預(yù)注漿技術(shù)有以下特點(diǎn)：
提高井下掘進(jìn)施工安全；
盡量減少豎井掘進(jìn)中水和氣體的下沉；
盡量減少額外的灌漿作業(yè)期間的鑿井損失時(shí)間，從而減少延誤以及常設(shè)鑿井人員和設(shè)備的時(shí)間；
提供了該井地質(zhì)情況的詳細(xì)信息。對(duì)異常信息，巖脈，故障以及巖石（含金礫巖）交叉口可通過(guò)預(yù)注漿鉆孔的巖心進(jìn)行評(píng)價(jià)；
此信息對(duì)礦山以及豎井承包商很重要；
提高該地區(qū)附近豎井掘進(jìn)的巖石強(qiáng)度。
本文介紹了最近預(yù)注漿技術(shù)表面和深層次的一些應(yīng)用成功點(diǎn)。