Method for calculating allowed highest temperature in circular section lining concrete construction period

A technology of maximum temperature and calculation method, applied in calculation, hydraulic engineering, hydraulic engineering equipment, etc., can solve problems such as no reasonable available method, no clear requirement for crack resistance safety factor, and inability to effectively achieve temperature crack control goals, etc. achieve high precision

Active Publication Date: 2016-02-24
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Based on the above situation, at present, the maximum temperature allowed during the construction period of underground engineering lining concrete, the regulations and specifications have no clear requirements and anti-crackin

Method used

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  • Method for calculating allowed highest temperature in circular section lining concrete construction period
  • Method for calculating allowed highest temperature in circular section lining concrete construction period
  • Method for calculating allowed highest temperature in circular section lining concrete construction period

Examples

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Embodiment 1

[0047] Example 1: Take the temperature control and anti-cracking of the concrete lining of the circular section of the flood discharge tunnel of a hydropower station as an example.

[0048] 1. Basic information

[0049] A hydropower station is a large (I) project, the spillway is the main building (level I), and the pressure section is a circular section. The types of lining and surrounding rock are listed in Table 1. The inner diameter of the lining section is 7.5m (such as figure 1 shown), the design strength level of lining concrete is C 90 40. The length of the joint in the structural section is 9m. According to the measured data in the cave at the initial stage of excavation and the data provided by the design institute, the design unit takes the average temperature for many years as 23.5°C and the annual temperature variation as 1.5°C, and calculates with the cosine formula (10) according to the code.

[0050] T a = ...

Embodiment 2

[0101] Example 2: The maximum allowable temperature during the construction period of the concrete lining of the hydraulic tunnel of Wudongde Hydropower Station

[0102] The Survey and Design Institute of the Yangtze River Committee adopts the allowable temperature difference of the dam foundation concrete for the temperature control and crack prevention of the hydraulic tunnels (including power generation tunnels, diversion tunnels, and flood discharge tunnels) of the Wudongde Hydropower Station, referring to the "Code for Design of Concrete Arch Dams" ( DL / T5346-2006), since the concrete degree of the lining of the spillway tunnel is the standard design of the strong confinement area, the allowable temperature difference is added as the maximum temperature on the basis of the monthly average temperature in the tunnel (because it is the construction period, this is the monthly stable temperature field) control value. Firstly, according to the different operating conditions of...

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Abstract

The present invention discloses a method for calculating an allowed highest temperature in a circular section lining concrete construction period. A lining structure thickness, a concrete strength grade, a surrounding rock deformation modulus and a construction period in-tunnel air temperature Ta are substituted into a calculation formula so as to calculate the allowed highest temperature in the construction period of circular section lining concrete. According to the method disclosed by the present invention, influence of surrounding rock performance (the deformation modulus), the lining thickness, the lining concrete strength, the in-tunnel air temperature and the like on the allowed highest temperature value can be effectively reflected; the allowed highest temperature of the circular section structural lining concrete construction period is highly accurately and rapidly calculated, so that the method more accords with the practical situation of engineering, is more scientific and reasonable, and completely can be used for actual development of temperature control and crack prevention design of the engineering, and particularly for rapid regulation on a construction period field implementation scheme.

Description

technical field [0001] The invention relates to the technical field of temperature control and anti-cracking of engineering structure concrete, in particular to a method for calculating the allowable maximum temperature during the construction period of circular section lining concrete. Background technique [0002] Concrete cracks include structural cracks caused by external loads and non-structural cracks caused by deformation changes. 80% of them are temperature cracks. The large-section high-strength underground hydraulic lining concrete constructed in recent years has produced a large number of cracks without exception unless effective temperature control measures are taken, and most of them are penetrating temperature cracks during the construction period. [0003] The underground hydraulic structure has been working in a humid, alternating wet and dry environment for a long time. The existence of hazardous cracks seriously affects the integrity, safety, construction ...

Claims

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Application Information

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IPC IPC(8): G06F17/50E02B1/00
CPCE02B1/00G06F30/17
Inventor 段亚辉樊启祥
Owner WUHAN UNIV
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