A sealing structure for diversion tunnel

Abstract

The invention discloses a plugging structure, particularly discloses a plugging structure for a diversion tunnel and belongs to the technical field of hydraulic structure designing construction. The plugging structure is small in plugging construction work load and good in plugging effect. The plugging structure comprises the diversion tunnel arranged in a concealed body and a plugging body arranged in the diversion tunnel. A similar-oval plugging section with a longitudinal section smaller at two ends and larger in the middle is arranged on the diversion tunnel. The plugging body is a similar-oval plugging body matched with the shape of the similar-oval plugging section, and the similar-oval plugging body is arranged at the maximum cross section position of the similar-oval plugging section.

Description

technical field [0001] The invention relates to a sealing structure, in particular to a sealing structure for diversion tunnels, and belongs to the technical field of design and construction of hydraulic structures. Background technique [0002] At present, in water conservancy and hydropower projects, the diversion tunnel needs to be sealed after completing the diversion task. Generally, the traditional sealing method is to pour a long section of concrete in the diversion tunnel to fill the diversion tunnel. Friction and cohesion between the concrete and the surrounding rock of the diversion tunnel resists upstream water pressure. The main problems of this sealing method are: 1) The bonding effect between the sealing concrete and the top arch and side wall of the diversion tunnel body is poor. Although backfill grouting and contact grouting are used, the thermal expansion and contraction of concrete is doomed. All kinds of grouting make the plugging effect very poor, and t...

AI Technical Summary

Problems solved by technology

The main problems of this sealing method are: 1) The bonding effect between the sealing concrete and the top arch and side wall of the diversion tunnel body is poor. Although backfill grouting and contact grouting are used, the thermal expansion and contraction of concrete is doomed. All kinds of grouting make the plugging effect very poor, and there are great potential safety hazards; 2) The length of the concrete plugged with this plugging method is long, the amount of work is large, and the investment cost is high; 3) Due to the diversion tunnel Generally, it can only be sealed during the dry season of the river, and the sealing construction needs to be completed quickly and the water can be blocked. However, due to the large amount of sealing and the high heat of the concrete in this sealing method, it is necessary to wait for the concrete to cool before grouting, and the construction can be completed in a dry period. high pressure

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