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grouting "T", where there is an inlet connection, grout injection connection, and a <br />connection for a return line to the paddle mix agitator tank. By varying a valve on <br />the return line, a constant pressure can be maintained on the grout injection pipe. <br />This system was used to effect progressive stage grouting where each grout pipe <br />is drilled to a depth, pumped to a set pressure, then closed off. On subsequent <br />grouting stages, the pipe is drilled out, and the drilling continues several feet <br />deeper into the rock. <br />:] <br />_.;_~ ~ <br />: t .,, ~ r <br />n ~~}; <br />• Sj ' ~4: <br />' ~` ~ . ~ <br />.i `~ r ~~• ,.. r <br />. ~''4- .. <br />,~ ,a' _ <br />• •_'1 <br />Y ~ ' <br />~N <br />•.. ~_ <br />r ,1.. i:. ,., ~ ur <br />•,~T rT. ,- ~. M , <br />. ~` r ~t y ~ S',~wf`1 ~ ~ h ~ l ~ x <br />,; <br />,~. ~' a <br />_~ <br />Figure 9: Grout hole drilling <br />Typical layout of grouting pipes is shown in the drawing sets under Tab 5 <br />Detailed daily grouting logs can be found at Tab 14. Grout takes were minimal, <br />which indicates that the contact between the concrete and the rockmass was <br />generally low permeability, which is very favorable. <br />3.5 Formation grouting <br />Formation grouting is the grouting of the rockmass itself. For this project, it <br />consists of grout injection of pressurized grout through drillholes in a fan pattern, <br />• which are intended to intersect open joint systems in the rockmass immediately <br />adjacent to the adit. <br />