Anti-seepage treatment structure and anti-seepage treatment method for intersected part of grouting curtain and water diversion pipeline

Abstract

The invention discloses an anti-seepage treatment structure and an anti-seepage treatment method for an intersected part of a grouting curtain and a water diversion pipeline. The invention relates tothe anti-seepage treatment method for the intersected part of the grouting curtain and the water diversion pipeline, wherein the anti-seepage quality of the grouting curtain can be ensured, and construction is facilitated and the investment is saved. Expanding excavation of a hole body and pouring of first stage concrete are not needed. It has no special demand on a construction step of the waterdiversion pipeline and the grouting curtain. The structure structurally comprises the water diversion pipeline, the grouting curtain and a circumferential cementing curtain. The water division pipeline penetrates the grouting curtain, the circumferential cementing curtain is arranged around the water diversion pipeline and is overlapped to the grouting curtain, the circumferential cementing curtain comprises a circumferential grouting curtain grouting hole, first stage bare rock curtain grouted mortar and second stage covered re-grouted mortar. The circumferential grouting curtain grouting hole is filled with the first stage bare rock curtain grouted mortar and the second stage covered re-grouted mortar from inside to outside.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and hydropower engineering, and in particular relates to an anti-seepage treatment method for the intersection of a grouting curtain and a water diversion pipeline. Background technique [0002] Most of the underground powerhouses of conventional hydropower stations adopt the head development method. The caverns of the underground powerhouses are located in the mountains below the normal water storage level of the reservoir area. The seepage characteristics of the surrounding rock will become an important factor affecting the safety and normal operation of the project. The problem of groundwater seepage in the rock mass cannot be ignored . In order to reduce leakage and improve seepage stability of the surrounding rock, grouting curtains are mainly used for anti-seepage in the project. The anti-seepage curtain is arranged on the upstream side of the factory building, so the water diversi...

AI Technical Summary

Problems solved by technology

However, there are many processes in the water diversion pipeline, especially the penstock construction process is complicated, and the installation period is long. The large-scale grouting in the water diversion pipeline in the later period will occupy the straight line construction period of the water diversion pipeline; another way is to expand the excavation of the water diversion pipeline. Pouring the first-stage concrete, and then grouting the curtain along the first-stage concrete, this method will not interfere with the subsequent construction of the water diversion pipeline, but it needs to expand the excavation of the tunnel body and pour the first-stage concrete, which requires a large investment and a long construction period; there is another method It is to first grout the curtain of the rock mass near the water diversion pipeline, and then excavate the water diversion pipeline. This method needs to carry out the excavation and support of the grouting corridor and the construction of the grouting curtain in advance, otherwise the construction progress of the water diversion pipeline will be affected

Images