Maximum temperature tensile stress calculation method for urban door opening type bottom plate lining concrete construction period

A technology of maximum temperature and calculation method, applied in calculation, special data processing applications, instruments, etc., can solve problems such as cost, excessive funds, and undetermined construction mix ratio concrete performance parameters, etc., to achieve small calculation errors and simple calculation formulas Effect

Active Publication Date: 2019-05-21
WUCHANG UNIV OF TECH +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is necessary to carry out the concrete mix ratio and a large number of performance parameter tests first, and the test and simulation calculation will take more time; and it will cost more money; it cannot be carried out when the construction mix ratio is not determined and the concrete performance parameters are not obtained through experiments; Suitable for rapid adjustment of schemes in the preliminary design stage and during construction
In particular, the relevant codes so far do not have the required values ​​for the anti-cracking safety factor of the temperature control and anti-cracking design during the construction period. For example, the design of the temperature control and anti-cracking of concrete for the lining of hydraulic tunnels is based on the dam design code
[0006] Based on the above situation, the calculation of the temperature stress during the construction period of the underground engineering lining concrete, the finite element method takes a lot of time and cost, and cannot be applied to the preliminary test results without concrete Rapid adjustment of schemes during the design phase and during construction

Method used

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  • Maximum temperature tensile stress calculation method for urban door opening type bottom plate lining concrete construction period
  • Maximum temperature tensile stress calculation method for urban door opening type bottom plate lining concrete construction period
  • Maximum temperature tensile stress calculation method for urban door opening type bottom plate lining concrete construction period

Examples

Experimental program
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Effect test

Embodiment 1

[0077] F2-type 1m-thick lining in the non-pressure section of the flood discharge tunnel in the type III1 surrounding rock area of ​​the city gate tunnel

[0078] The F2 1m-thick lining in the Class III1 surrounding rock area is the structural section with the largest number of Chengmen tunnels in the non-pressure section of the flood discharge tunnel, and it is difficult to control the temperature and prevent cracking.

[0079] Such as Figure 5 As shown, the method for calculating the maximum temperature tensile stress during the construction period of the concrete for the lining of the city gate floor slab provided by this embodiment includes the following steps:

[0080] Step 1. Collect data for temperature control and anti-crack calculation of lining structure:

[0081] Lining structure design data, lining structure section, concrete strength grade; environmental data, deformation modulus of surrounding rock under geological conditions, annual variation of temperature in ...

Embodiment 2

[0099] F4 type 1.5m lining in the non-pressure section of the flood discharge tunnel in the floor of the city gate tunnel type IV surrounding rock area

[0100] The basic information is the same as above. In order to reduce the length of the paper, only a brief introduction of the summer temperature control calculation results of the F4-type lining in the surrounding rock area of ​​Category IV is briefly introduced.

[0101] In the design stage, the pouring construction will be carried out on July 1 in summer, and the temperature T in the cave will be calculated. a is 25.63℃, and the lowest temperature in winter is T min = 20°C. According to the above data, H=1.5m, W=15.2m, L=9m, C=40, E=5GPa, T 0 = 18°C. The three proposed temperature control schemes (T g 0°C, 23°C, 13°C respectively) and the above parameters are substituted into formula 1 to calculate: No water cooling scheme σ max =2.147MPa; 12℃ cooling water cooling scheme σ max =1.75MPa; 22℃ room temperature water...

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Abstract

The invention provides a maximum temperature tensile stress calculation method for an urban door opening type bottom plate lining concrete construction period. The maximum temperature tensile stress calculation method comprises: step 1, data for urban door opening type bottom plate lining concrete temperature control anti-cracking calculation are collected; step 2, calculating the maximum temperature tensile stress for the urban door opening type bottom plate lining concrete construction period, [sigma]max =-0.2695xH-0.1250xW+0.2370xL+0.0350xC+0.0330xE+0.1032xT0-0.0188xTg- 0.1342xTa-0.1091x(Ta-Tmin)-0.6323 / H+0.1752x(Ta-Tmin) / H-0.0006xE2+0.0051xW2+0.0171xHxT0+0.0013xHxTg+0.0043xExH+0.0498xHx(Ta-Tmin)+0.6079.

Description

technical field [0001] The invention belongs to the technical field of temperature control and anti-cracking of engineering structure concrete, and in particular relates to a method for calculating the maximum temperature tensile stress during the construction period of the concrete for the lining of the bottom plate of the gate opening section. Background technique [0002] Cracks are one of the main diseases of concrete. According to the dominant cause of cracks, it can be divided into two categories: structural cracks caused by external loads and non-structural cracks caused by deformation changes. Deformation effects include temperature, drying shrinkage and wet expansion, and deformation of surrounding rock, among which 80% are temperature cracks. In recent years, with the rapid development of water conservancy and hydropower engineering construction, the scale and section size of underground hydraulic engineering have become larger and larger, and the environmental co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCY02E10/20
Inventor 段亚辉樊启祥段次祎方朝阳王雷刘红霞
Owner WUCHANG UNIV OF TECH
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