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Artificial short seam structure of rolled concrete arch dam

A roller compacted concrete and artificial technology, applied in arch dams, dams, etc., can solve problems such as destroying the integrity of arch dams, and achieve the effect of speeding up the pouring progress and advancing engineering benefits.

Inactive Publication Date: 2003-10-29
TSINGHUA UNIV
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Problems solved by technology

In South Africa, two RCC gravity arch dams were built in 1988 and 1990 (the 50-meter-high Kwalport dam and the 70-meter-high Ullevidans dam), which were poured from the whole warehouse without transverse joints. , the temperature-induced slit arrangement is as follows figure 1 As shown, the temperature induction joints (11-15) are set on the upstream surface, which are arranged in a radial direction, the length of the joints is 2 meters, and the distance between the joints is 10 meters. Over time, some develop into penetrating cracks, destroying the integrity of the arch dam

Method used

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  • Artificial short seam structure of rolled concrete arch dam
  • Artificial short seam structure of rolled concrete arch dam
  • Artificial short seam structure of rolled concrete arch dam

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Embodiment Construction

[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0020] The artificial short joint structure of the roller compacted concrete arch dam proposed by the present invention is as follows: figure 2 As shown in the figure, artificial creases 211 and 212 are set at the left and right abutments of the arch dam, with a radial length of 1.0 m to 1.5 m, generally not exceeding 1 / 4 of the dam thickness, so as not to increase the shear stress of the abutment. The crease angle θ is about 30-60°, and the crease length is similar to the radial direction. Set water stops 231 and 232 on the upstream surface of the artificial crease, set drain pipes 241 and 242 in the seam, and arrange grouting pipes and grouting boxes 251 and 252 at the edge of the seam, so that grouting can be performed after the concrete on the upstream dam surface cools down. connected into a whole. Crack stop materials 261 and 262 are ...

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Abstract

The invention belongs to the technical field of water conservancy engineering, and comprises setting artificial creases on the left and right abutments of a roller compacted concrete arch dam, setting water stop, drainage and grouting systems in the slits, and setting crack arresting materials at the ends of the slits; Artificial radial short slits are provided with crack arresting materials at the ends of the slits. The invention can effectively release the temperature stress of the roller compacted concrete on the surface of the dam during the construction period of the dam, the temperature drop tensile stress and the water load tensile stress of the arch dam during the operation period. Improved abutment stability.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering, in particular to the structural design of a roller compacted concrete arch dam. Background technique [0002] The arch dam is an overall statically indeterminate structure fixed on the foundation rock mass. After the concrete is poured, the internal temperature of the concrete rises in the early stage, and the surface heat dissipation temperature is low. The temperature difference between the inside and outside forms the surface temperature difference tensile stress. The upstream surface of the abutment and the downstream surface of the arch crown produce a large temperature tensile stress, and the water load of the reservoir will also increase the tensile stress on the upstream surface of the abutment. When the tensile stress caused by temperature and water load exceeds the tensile strength of concrete Cracks will appear in the dam body, destroying the integrity of the arch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B7/12
Inventor 刘光廷张富德谢树南李鹏辉陈凤岐
Owner TSINGHUA UNIV
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