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Temperature control anti-cracking method for aqueduct in operation period

A temperature-controlled crack-prevention, operation period technology, applied in water conservancy projects, artificial waterways, bridge parts, etc., can solve the problems of heat release concentration, affecting the durability and safety of the structure, large amount of concrete and cement, etc., to achieve no pollution effect. , Easy to lay and paste, good thermal insulation effect

Pending Publication Date: 2022-04-12
高宗德
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The aqueduct is a thin-walled concrete structure. Most of the concrete used has the characteristics of large amount of cement, large heat of hydration, fast hydration speed, concentrated heat release, large breeding volume, more ash and more water. Cracks are easily produced under the action of temperature stress, which affects the use of the structure, especially when the early concrete has drying shrinkage and creep
The external temperature is the decisive factor for the temperature stress of concrete, including cracks caused by solar radiation, sudden changes in temperature and temperature differences between day and night, which seriously affect the durability and safety of the structure, and will cause water loss

Method used

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  • Temperature control anti-cracking method for aqueduct in operation period
  • Temperature control anti-cracking method for aqueduct in operation period
  • Temperature control anti-cracking method for aqueduct in operation period

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] After pasting different thicknesses (2 cm, 3.5 cm, 5 cm) of polyurethane heat insulation on the outer surface of the aqueduct, the highest temperature of the aqueduct body appears on the top plate, and the temperature of the aqueduct body after different thicknesses of polyurethane heat insulation is lower than that of the aqueduct without heat insulation measures The temperature is significantly lower than that. The maximum tensile stress of the aqueduct body is also significantly lower than that of the aqueduct without heat insulation measures. Therefore, after the heat insulation measures are taken, the temperature difference between the inside and outside of the tank decreases, and the temperature stress caused by the temperature difference also decreases, especially the temperature tensile stress, which effectively prevents cracks. The surface temperature gradually decreases. But the thickness increases beyond a certain value, and the heat insulation effect is not...

Embodiment 2

[0038] After pasting different thicknesses (2 cm, 5 cm, 8 cm) of polyurethane insulation on the outer surface of the aqueduct, the lowest temperature of the aqueduct appeared on the east and west webs, and the temperature of the aqueduct body after different thicknesses of polyurethane insulation was comparable to that of the aqueduct without heat insulation measures ratio has increased significantly. The maximum tensile stress of the aqueduct body is also significantly lower than that of the aqueduct without heat insulation measures. Therefore, after taking heat insulation measures, the temperature gradient of the tank body decreases, and the temperature stress caused by the temperature difference also decreases, especially the temperature tensile stress, which effectively prevents cracks. The temperature gradually increased. But when the thickness increases beyond a certain value, the thermal insulation effect is not so obvious.

[0039] Table 9 The maximum temperature dif...

Embodiment 3

[0057] In summary, during the normal operation period of the aqueduct, in addition to normal maintenance, 3.5 cm thick polyurethane should be pasted on the outside of the east and west webs of the aqueduct, 5 cm thick polyurethane on the inside of the east and west webs of the aqueduct, and 5 cm thick polyurethane on the top side of the aqueduct. Polyurethane, 2 cm of polyurethane on the underside of the top plate, and 2 cm of polyurethane on the top and bottom of the web.

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Abstract

The invention discloses a temperature control anti-cracking method for an aqueduct in the operation period, particularly relates to an active bidirectional heat preservation and insulation method for preventing concrete aqueduct cracks caused by temperature, and belongs to the technical field of hydraulic structure engineering aqueducts, the technical scheme is that the aqueduct comprises a concrete layer (1), and polyurethane foam plastic plates (2) are arranged on the inner surface and the outer surface of the aqueduct; austenitic stainless steel (3) is arranged in the middle of the aqueduct concrete layer (1). The invention aims to provide a method which is light in volume weight, strong in fire resistance, good in stability, excellent in wear resistance and convenient to pave and adhere on a structural surface, has a heat preservation effect and a heat insulation effect, and avoids the situation that the aqueduct cannot operate normally due to temperature cracks generated by the concrete in solar radiation and damp-cold periods due to overlarge temperature difference.

Description

technical field [0001] The invention relates to the technical field of hydraulic structure aqueducts. Background technique [0002] An aqueduct is an overhead water delivery structure built to transport channel water across rivers, roads, valleys, etc. It is one of the most widely used crossing structures in canal structures. [0003] The aqueduct is a thin-walled concrete structure. Most of the concrete used has the characteristics of large amount of cement, large heat of hydration, fast hydration speed, concentrated heat release, large breeding volume, more ash and more water. Under the action of temperature stress, cracks are easily produced, which affects the use of the structure, especially when the early concrete has shrinkage and creep. The external temperature is the decisive factor for the temperature stress of concrete, including cracks caused by solar radiation, sudden temperature changes, and temperature differences between day and night, which seriously affect ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B5/00E01D18/00E01D19/00
Inventor 高宗德周雅贤张永磊
Owner 高宗德
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