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

A technology of concrete temperature and design method, applied in the direction of calculation, special data processing applications, instruments, etc., can solve problems such as inapplicability, achieve small calculation errors, simple calculation formulas, and achieve the effect of temperature control and crack prevention

CN110569551AActive Publication Date: 2019-12-13WUCHANG UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-12-13

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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.
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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...

Examples

Embodiment 1

[0090] The right bank of the flood discharge tunnel 3 # 、4 # F2-type 1.0m-thick lining in the Ⅲ1 type surrounding rock area of ​​the door-cavity section in the unpressured section

[0091] Type Ⅲ1 type F2 1.0m thick lining in the surrounding rock area is the right bank of the flood discharge tunnel 3 # 、4 # The structural section with the largest number of door openings in the non-pressure section and the difficulty of temperature control and crack prevention. Right Bank 3 # 、4 # The lining of the door opening section in the non-pressure section is poured in three phases, and the side wall is first poured with a height of 14.87m, which is a free end slab.

[0092] Such as Figure 5 As shown, the method for designing the temperature crack control crack resistance K value of the end free lining slab concrete provided in this embodiment includes the following steps:

[0093] Step 1. Collect data for the calculation of temperature-controlled crack resistance of end-free li...

Embodiment 2

[0112] The right bank 3 of the unpressurized section of the flood discharge tunnel # 、4 # F4-type lining in the Ⅳ category surrounding rock area of ​​the gate-shaped section

[0113] Such as Figure 5 As shown, the method for designing the temperature crack control crack resistance K value of the end free lining slab concrete provided in this embodiment includes the following steps:

[0114] Step 1. Collect data for the calculation of temperature-controlled crack resistance of end-free lining slab concrete

[0115] The basic information is the same as above. Right Bank 3 # 、4 # The lining of the door opening section in the non-pressure section is poured in three phases, and the side wall is first poured with a height of 14.87m, which is a free end slab.

[0116] Step 2. Analyze and determine the temperature control anti-cracking target and the allowable value of the anti-cracking safety factor [K] of the end free slab lining concrete

[0117] The Xiluodu flood discharg...