1. 1 Development Status and Research Significance of Cofferdam Lock Construction This paper summarizes the research situation of1.21.31.4 at home and abroad. The main work of this paper is as follows.

Chapter 2 Overview of Cofferdam of Xiangjiang Shiplock in Changsha

2. 1 overview 2.2 Hydrometeorological conditions and hydrological characteristics 2.2.2 Temperature 2.2. 1 precipitation 2.2.3 2.4 Overview of engineering geological conditions

Chapter III Diversion and Closure of Embankments

Construction diversion material 3.1.1./shortage of special function cofferdam material 3.1.23.1.33. 4 High diversion measures taken due to the shortage of shipping materials during the construction of the second cofferdam 3.2 3.3 3.3 Design and construction of cofferdam closure. 1 closure mode closure 3.3.2 design calculation model 3.3.2.1calculation of discharge capacity of longkou in 3.3.2.2, 3.3.2.3 design closure dike 3.4. 1 inclusion of pre-closure and closure head 3.4.2 construction 3.4.3 closure construction of longkou.

Chapter 4 Calculation of Cofferdam Stability

4. 1 Stability check of rock slope of cofferdam front concrete cofferdam 4.2 4.3 Stability check of downstream slope of back silty clay cofferdam 4.4 (vertical) back surface sand cofferdam slope material 4.5 Stability check of cofferdam top cover pre-filling 4.6 Stability analysis of downstream longitudinal cofferdam of inclined panel outlet 4.7 Calculation of front slope covered with front concrete longitudinal cofferdam 4.8 4.9 Stability calculation of silty clay slope of split panel cofferdam.

Chapter V, Construction Process of Main Cofferdam

5. 1 Construction 5. 1. 1 Preparation of construction concrete film bag 5. 1.2 5. 1.3 Laying concrete panel with film bag 5.25.25.2.6.5438+0.5.2.