Dam grout stopping body and arranging method thereof

Abstract

The invention relates to the field of concrete dam construction and discloses a grout stopping body. The grout stopping body comprises a trapezoid concrete structure, the bottom surface of the trapezoid concrete structure is provided with steel bars and inserted reinforcements, and the grout stopping body is characterized in that the top surface of the concrete structure is provided with an axialgroove. The invention also discloses a method for arranging the grout stopping body. One grout stopping body is added in the traditional mounting method, thus ensuring a curtain grouting region to beindependent with a surface grouting region. By adopting the grout stopping body in the invention, construction difficulty is reduced and construction progress is sped up, thus being beneficial to vibrating and densifying concrete and improving the quality of the concrete of the grout stopping body. In the method for arranging the grout stopping body in the invention, the curtain grouting region is separated from the surface grouting region, curtain grouting construction is not restricted by surface grouting construction, and the curtain grouting is firstly carried out, thus having significance for shortening construction period and being beneficial to improving the construction quality of surface grouting.

Description

technical field [0001] The invention relates to the field of concrete dam construction. Background technique [0002] In the construction of concrete dams, the contact grouting of the gap between the dam and the rock slopes on both sides and the curtain grouting of the rock foundation of the dam are two important procedures in the dam construction, and the construction quality is related to the quality of the dam. Stability and security. [0003] The foundation needs to be excavated before the dam construction, such as figure 1 As shown, the original ground line 1 is excavated to the slightly weathered rock to form the foundation surface of the dam, and then the concrete dam 2 is poured on the foundation surface. The temperature of the dam concrete rises at the initial stage due to the exothermic heat of cement hydration, and then the temperature of the dam drops to a stable temperature. As the dam cools, its volume shrinks, causing the gap between it and the rock foundat...

AI Technical Summary

Problems solved by technology

[0007] (1) A metal grout stopper 12 needs to be inserted in the middle of the trapezoidal concrete structure 10 to make the formwork installation during construction time-consuming and affect the construction progress;

[0008] (2) Due to the small size of the trapezoidal concrete structure 10, a metal grout stopper 12 is inserted in the original narrow space, so that the concrete vibrates the grout stop itself Difficult, leading to the trapezoidal concrete structure 10 is prone to concrete quality defects such as honeycomb and pockmarks, affecting the effect of grouting and waterstopping

If the internal temperature of the dam body does not meet the specified conditions for contact grouting at this time, the dam will continue to cool down and shrink, and the joints between the dam body and the bedrock on both banks will continue to open, because the joint grouting system has been blocked at this time. Dead, at this time the seam can no longer be perfused

[0011] (2) The contact grouting construction operation takes a short time, but it takes a long time to reach the basic conditions that allow the construction operation to start. Only when the internal temperature of the dam body drops to a certain value and seam opening can only be carried out after meeting the requirements, but it often takes a long time to meet the above basic conditions

However, curtain grouting in the project requires a lot of work and takes a long time. The construction conditions are not limited by the opening of the joint surface and the internal temperature of the dam body. As long as the concrete covering thickness reaches 2m or more, the construction can be carried out. However, due to Figure 2 The structural arrangement can only be done with contact grouting first and then curtain grouting, it cannot allow The curtain grouting was carried out as soon as possible, and a large amount of construction period was passed while waiting, which had a negative impact on the early water storage and commissioning of the project for power generation

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