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Control method of water cooling water temperature for lining structure concrete

A water temperature control method and water cooling technology, applied in infrastructure engineering, water conservancy engineering, hydroelectric power generation, etc., can solve the problems of poor control of concrete temperature cracks, unreasonable, no theoretical support, etc.

Active Publication Date: 2020-12-18
WUCHANG UNIV OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Based on the above situation, the current method of controlling the internal temperature of lining structure concrete through water cooling, the water cooling water temperature control (allowable temperature difference between concrete and cooling water) is not scientific, has no theoretical support, and is obviously unreasonable. Poor assurance of crack control

Method used

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  • Control method of water cooling water temperature for lining structure concrete
  • Control method of water cooling water temperature for lining structure concrete
  • Control method of water cooling water temperature for lining structure concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] Embodiment one 2 # Water cooling of the lining concrete of the fourth unit of the spillway tunnel

[0108] Such as Figure 4 shown, 2 # The thickness of the lining structure of the fourth unit in the upper flat section of the spillway tunnel is 2.5m, which is C 90 40 low heat concrete. The side wall lining concrete was poured on May 12, 2017, as an example.

[0109] Such as image 3 As shown, the method for controlling the temperature of the lining structure concrete through water cooling water provided in this embodiment includes the following contents:

[0110] Step 1. Analyze the temperature control data of the lining concrete and determine the water cooling temperature control scheme:

[0111] Step 1-1. Organize and analyze the basic data of lining structure engineering. 2 # The basic information of the lining structure of the fourth unit of the upper flat section of the flood discharge tunnel, including temperature control and crack prevention, water coolin...

Embodiment 2

[0139] Example two 2 # Water cooling of the lining concrete of the fourth unit of the spillway tunnel

[0140] 2 # The 139th unit of the flood discharge tunnel body, the gate-shaped lining, the thickness of the side wall lining is 1.5m, and the circumferential construction joints are set every 12m along the axis of the flood discharge tunnel. The surrounding rock is class IV. The bottom plate and side wall of the lining structure are C 90 40 low heat cement concrete, top arch is C 90 30 Low heat cement concrete, such as Figure 6 shown. The basic temperature control information is the same as above. The design concrete pouring temperature is 18°C, and tap water at room temperature is used for moisturizing and curing for 90 days, and the internal temperature of the concrete is controlled by water cooling. Poured on November 12, 2018.

[0141] Such as image 3 As shown, the method for controlling the temperature of the lining structure concrete through water cooling water...

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Abstract

The invention provides a lining structure concrete water cooling water temperature control method. The method comprises the following steps: (1) lining concrete temperature control data is collected;(2) a water cooling control water temperature is calculated based on the collected lining concrete temperature control data, comprising: (2-1) an allowed temperature difference [delta Tcw]=2H+0.6 C between lining concrete and cooling water is calculated by a formula 1; (2-2) a water cooling water temperature lowest value Tw, min=Tmax-[delta Tcw] is calculated; and (2-3) the water cooling control water temperature Tw is determined: according to water temperature conditions in a construction site and the requirements of calculating the water cooling water temperature lowest value Tw, the water cooling control water temperature Tw is determined under the precondition of Tw not smaller than Tw, min; and (3) the water cooling is performed on lining structure concrete according to the water cooling control water temperature Tw to realize the temperature control cracking prevention to prevent cracks at the internals and pipe peripheries due to quicker temperature drop.

Description

technical field [0001] The invention belongs to the technical field of temperature control and anti-cracking of lining structure concrete, and in particular relates to a method for controlling the temperature of lining structure concrete through water for cooling. Background technique [0002] Lining is a structure widely used in civil engineering. Lining concrete will heat up due to the heat of hydration of cement and other cementitious materials, resulting in high internal temperature. For example, the highest temperature inside the lining concrete of the water delivery tunnel in the permanent ship lock of the Three Gorges Water Conservancy Project reaches nearly 60°C, and the lining concrete of the water delivery tunnel of Xiaolangdi Hydropower Station The highest internal temperature reached more than 70°C. The thickness of the lining structure is small, and most of them have high strength (for example, the strength of the spillway tunnel of a large hydropower station r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B9/00E02D15/02
CPCE02B9/00E02D15/02Y02E10/20
Inventor 段亚辉樊启祥段次祎方朝阳付继林苏立
Owner WUCHANG UNIV OF TECH
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