Longitudinal concrete cofferdam structure

Abstract

The utility model discloses a longitudinal concrete cofferdam structure, and belongs to a cofferdam body formed by pouring concrete. The structure comprises a cofferdam body, one side of the section of the cofferdam body is perpendicular, the other side of the section of the cofferdam body is step-shaped, the bottom of the cofferdam body is fixed to bed rock through anchor rods, water stop grooves are formed in the bottoms of parting positions of the cofferdam body, and the parting positions are filled with water stop rubber; the plane of the inlet section of the cofferdam body is arc-shaped, and the section height is gradually increased from the inlet to the main body. The cofferdam structure is safe and stable in operation, guarantees that a project plays benefits on schedule, and meanwhile saves manpower and material resources of construction investment.

Description

Technical Field

[0001] The utility model belongs to the technical field of water conservancy project construction, and particularly relates to a longitudinal concrete cofferdam structure. Background Art

[0002] In staged diversion, a longitudinal cofferdam is often required. Due to the hydraulic conditions of the diversion, the cofferdam needs to retain water on both sides. Traditional bidirectional water-retaining cofferdams are typically concrete structures with sloped sides and a trapezoidal cross-section. While this type of concrete cofferdam meets the structural requirements for bidirectional water retention in staged diversion, it is relatively large, requiring significant investment and manpower for construction. Utility Model Content

[0003] The utility model provides a longitudinal concrete cofferdam structure, which aims to enable the cofferdam to meet the structural force requirements and save material and manpower input in the project.

[0004] A longitudinal concrete cofferdam structure is characterized by comprising a cofferdam body cast in concrete, with one side of the cofferdam body cross-section being vertical and the other side being stepped, the bottom of the cofferdam body being fixed to the bedrock by anchor rods, a waterstop groove being provided at the bottom of the joints of the cofferdam body, and waterstop rubber being filled between the joints; the plane of the inlet section of the cofferdam body being arc-shaped, and the cross-sectional height gradually increasing from the inlet to the main body.

[0005] The beneficial effects of the utility model are that the cofferdam structure operates safely and stably, ensuring that the project can achieve benefits as scheduled, while saving manpower and material resources invested in construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 This is a cross-sectional view of a longitudinal concrete cofferdam structure.

[0007] Figure 2 This is a plan layout diagram of a longitudinal concrete cofferdam structure.

[0008] Figure 3 This is a vertical concrete cofferdam structure elevation layout.

[0009] Among them: 1-cofferdam body, 2-anchor rod, 3-waterstop groove, 4-waterstop rubber. DETAILED DESCRIPTION

[0010] Example 1: The Nam Ou River Cascade Hydropower Station is located in Luang Prabang, Laos. It is the third of seven planned cascades on the Nam Ou River. The Nam Ou River Cascade Hydropower Station is primarily used for power generation. The main structures consist of a concrete gravity dam, a riverbed powerhouse, an overflow outlet, a stilling basin, and a sand flushing bottom outlet. The maximum dam height is 59.5m, and the normal water level of the reservoir corresponds to a storage capacity of 1.81×10 8m³, with a total installed capacity of 210MW. Construction of the Nam Ou Jiang Hydropower Station (Nan Ou Jiang 3-Level Hydropower Station) commenced on April 8, 2016, and all units were operational in December 2020. During construction, both upstream and downstream longitudinal cofferdams employed a longitudinal concrete cofferdam structure. This structure consists of a concrete cofferdam body 1 with a vertical cross-section on one side and a stepped cross-section on the other. The cofferdam body 1 is anchored to the bedrock with anchor bolts 2 at its base. Waterstop grooves 3 are located at the bottom of the cofferdam body 1, and waterstop rubber 4 is embedded within the joints. The inlet section of the cofferdam body 1 is arc-shaped, with the cross-section height gradually increasing from the inlet toward the main body. This longitudinal cofferdam has been used for two flood seasons and has effectively met the hydraulic load requirements of each stage of the phased diversion. The cofferdam structure operates safely and stably, effectively ensuring the project's scheduled benefits. By implementing this utility model cofferdam structure, the upstream and downstream longitudinal cofferdams of the Nam Ou Jiang 3-Level Hydropower Station saved approximately 6 million yuan in investment.

Claims

1. A longitudinal concrete cofferdam structure, characterized by: It includes a cofferdam body cast in concrete, with one side of the cofferdam cross section vertical and the other side stepped. The bottom of the cofferdam body is fixed to the bedrock by anchor rods. A waterstop groove is set at the bottom of the joint of the cofferdam body, and waterstop rubber is buried in the waterstop groove. The joints are filled with foam boards; the plane of the inlet section of the cofferdam body is arc-shaped, and the cross-sectional height gradually increases from the inlet to the main body.

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