Application of 3D inclined hole curtain grouting in slotted gravity dam foundation reinforcement

A kind of simple and practical molding and stripping mechanism for plastic parts with inclined hole is introduced.

are chosen as collapse-proofadditive from treating reagent of mud．Aseries of data obtained from the collapse-prooftest in laboratory is applied to the air-foam drilling with 70°inclined hole in the crushedand soft-hard interstratified layers in Nanxiang gold mine.

In order to content the need for drilling slant holes of different angles, the suspend-arm type tower is designed according to the machinery characteristics of XY series drilling machine.

Based on the analysis of the processing technic and configuration feature of angle hole of piston rod, the author gives a design of drilling jig.

Curtain grouting design for Zhongguan iron mine demands big depth and high verticality,but under the complex geological and hydrological conditions,borehole deviation is serious.

Also it is difficult to control hole deviation.

This paper introduces the examination of compound pile foundation,the principle of grouting reinforcement and the construction technology,and elaborates the common problems of the drill hole deviation s prevention in the process of drilling holes and taking cores.

According to the quality problems encountered in construction process, such as hole collapsing, plugging and borehole deviation their causing reasons are analyzed; at the same time corresponding quality control measures are proposed.