End free lining plate concrete temperature crack control anti-cracking K value design method

Abstract

The invention provides an end free lining plate concrete temperature crack control anti-crack K value design method. The method comprises the steps that 1, data for end free lining plate concrete temperature control anti-crack calculation are collected; 2, a temperature control anti-cracking target and an anti-cracking safety factor allowable value [K] of the end free plate lining concrete are analyzed and determined; 3-1, the variables are analyzed, and a plurality of temperature control anti-cracking construction measure schemes are drawn up; 3-2, each proposed temperature control anti-cracking construction measure scheme is substituted into a formula 1 to calculate the minimum anti-cracking safety coefficient Kmin=0.2717 H-0.0328 W-0.026 C-0.0385 E-0.0424 T<0>+0.0166 Tg+0.0172Ta-0.0691deltaT+4.62 in the end free lining plate concrete construction period; and 3-3, under the condition that Kmin is larger than or equal to [K], a measure scheme is optimized according to the simple, practical and economical principle for construction application.

Description

technical field [0001] The invention belongs to the technical field of engineering structural concrete temperature control and anti-cracking, and in particular relates to a design method for controlling the cracking resistance K value (safety factor) of concrete temperature cracks of end free lining slabs. Background technique [0002] In recent years, with the rapid development of water conservancy and hydropower engineering construction, the scale and section size of hydraulic structures have become larger and larger, and the environmental conditions such as geology have become more and more complex. As the height of the dam increases, the flow rate of the water discharge becomes higher and higher, and the strength of the concrete is also higher. Large-section high-strength hydraulic lining concrete, as long as effective measures are not taken, will produce a large number of cracks without exception, and most of them are penetrating temperature cracks during the constructi...

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Problems solved by technology

[0009] In the patent 201910157425.6, although the anti-cracking safety factor design method for the control of temperature cracks in the side wall concrete of the door-shaped section lining is proposed, it belongs to the calculation of the anti-cracking safety factor for the control of temperature cracks in the side wall with the integral (one-time) pouring method of the top arch method, which is suitable for the side wall of one-time pouring method (for example, the left bank 1 # ,2 # The unpressured section of the spillway tunnel adopts the side wall and the top arch as a whole); while for the lining concrete structure (for example, the right bank 3 # 、4 # The method of patent 201910157425.6 is not applicable due to the different constraint conditions at the end of the spillway tunnel lining side wall, and it is urgent to provide a design method for controlling the maximum temperature tensile stress K value during the construction period that can be applied to the free lining slab concrete at the end

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