Mass concrete construction method of super-thick foundation

A technology of mass concrete and construction method, applied in the direction of basic structure engineering, building construction, construction, etc., can solve the problem of damage to the bearing capacity, use function and durability of the engineering structure, affecting the frost resistance, impermeability, acceleration, etc. of the structure. Concrete natural aging and other problems, to achieve the effect of shortening the time of heat dissipation, reducing the curing time and improving the quality of concrete

Inactive Publication Date: 2011-02-02
TIANJIN 20 CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The occurrence and development of concrete cracks not only affect the appearance of the project, but also accelerate the carbonation of concrete, affect the frost resistance and impermeability of the structure, cause the infiltration of moisture and harmful substances, induce...

Method used

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  • Mass concrete construction method of super-thick foundation
  • Mass concrete construction method of super-thick foundation
  • Mass concrete construction method of super-thick foundation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 3200m 3 The outline of the blast furnace foundation is rectangular, with a length of 57m and a width of 42.6m. The base elevation -5.000m to ±0.000 is ordinary C25 concrete, and the total amount of concrete is about 11,000m 3 .

[0048] 1. Construction of water-cooled pipes:

[0049] See Figure 1~2 , after the steel bars on the bottom plate of the blast furnace foundation are bound, the cooling water pipe 1 is constructed on the steel bar fixing frame 3. Within the scope of 53m×38.6m in the foundation, 3 layers of snake-shaped water pipes with a diameter of 48mm×1500mm are pre-buried. The distance between the first layer and the The concrete cushion is 1m, the distance between the second layer and the concrete cushion is 2.5m, and the distance between the third layer and the concrete cushion is 4m. A water leak test is required and repairs to leak points are required.

[0050] 2. Mixing of concrete:

[0051] C25 anti-crack concrete is used, and the mix ratio per ...

Embodiment 11

[0059] Table 1: A mix ratio of C25 anti-crack concrete for ultra-thick, large-volume foundations:

[0060] material name

Embodiment 12

[0062] Table 2: A mix ratio of C25 anti-crack concrete for super-thick, large-volume foundations:

[0063] material name

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Abstract

The invention discloses a mass concrete construction method of a super-thick foundation, comprising the following steps of: (1) binding the steel bars on a base plate of the foundation, and fixing cooling water pipes on a steel bar fixing frame, wherein the cooling water pipes are evenly distributed at the inside layers of the foundation; (2) blending the concrete; (3) pouring the concrete; (4) carrying out press polishing to the concrete on the surface of the foundation before the final setting of the concrete of the foundation; and (5) maintaining the foundation. The invention adopts the anti-cracking concrete so as to reduce the cement content and decrease the generation of the heat of hydration; the embedding of the cooling water pipes can shorten the emission time of the heat in the concrete and decrease the maintenance time of the concrete structure; the press polishing is carried out to the surface of the concrete structure to ensure that the desiccation fissures are prevented; and maintaining the concrete with preserved temperature and humidity can improve the quality of the concrete. The invention has the effects of at least improving the work efficiency by 4 times, greatly saving the cost, improving the work efficiency and paving the way for the advanced construction of the next process.

Description

technical field [0001] The invention relates to a large-volume concrete construction method, in particular to a super-thick foundation large-volume concrete construction method. Background technique [0002] In the construction of basic engineering of metallurgical industrial equipment, especially blast furnace engineering, as the scale of blast furnace increases, the amount of foundation concrete increases accordingly. During the continuous pouring and hardening of mass concrete, the hydration reaction of cement generates a large amount of hydration heat. The thickness of concrete is ≥5m, the thermal resistance is very large, the internal hydration heat accumulation is not easy to dissipate, the hydration temperature rises high, and the surface dissipates heat quickly, forming a large temperature difference between the interior and surface of the concrete. Changes in the temperature difference between the interior and surface of the concrete plus the influence of external e...

Claims

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Application Information

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IPC IPC(8): E04G21/02E02D27/44C04B28/08
Inventor 肖策
Owner TIANJIN 20 CONSTR
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