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Construction method for large-volume concrete structure of bridge loading platform

A technology of large-volume concrete and concrete structures, which is applied in the direction of basic structure engineering and construction, and can solve problems such as bonding light resistance, aging, and corrosion, so as to improve integrity, maintain long-term durability, and avoid lax sealing Effect

Active Publication Date: 2012-10-24
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, there are two aspects to be considered in the design and construction of the large-volume concrete of the bridge caps of the cross-river-sea bridge under the environment of sand-carrying surge erosion: first, the large-volume concrete of the bridge caps and other parts The concrete structure should have the characteristics of low temperature rise and crack resistance during the construction period, and can have sufficient ability to resist the occurrence of temperature cracks; The impact of surge erosion is small, and it can maintain long-term durability in this environment. At present, it is generally used to protect the large-volume concrete structure of bridge caps and other parts by coating steel pipes or painting wear-resistant paint to reduce sand carrying. The impact of the surge erosion environment on the large-volume concrete structure of bridge caps and other parts, however, there are serious problems of corrosion in the method of jacketing steel pipes, and there are problems of bonding with the foundation concrete and resistance to light aging when the wear-resistant paint is applied

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  • Construction method for large-volume concrete structure of bridge loading platform
  • Construction method for large-volume concrete structure of bridge loading platform
  • Construction method for large-volume concrete structure of bridge loading platform

Examples

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Embodiment 1

[0032] For a large-volume concrete structure of a bridge cap across the river and sea, its design thickness h is 5m, and the total concrete consumption is 4482.9m 3 , the bridge cap is constructed in two layers, and the thickness of the first layer is m 1 3m, the thickness of the second layer of pouring m 22m, the design thickness t of mass concrete at the edge is 0.8m, and the slope angle θ is 30°. The concrete construction process of this embodiment is:

[0033] 1) Erect the formwork, according to the inclination angle θ of the slope, the design thickness t of the mass concrete at the edge and the pouring thickness of the first layer m 1 , while pouring the first layer of side mass concrete and interior mass concrete;

[0034] 2) When the first layer of concrete reaches the form removal time, after the form removal, according to the inclination angle θ of the slope, the design thickness t of the bulk concrete at the edge and the pouring thickness of the second layer m 2 ...

Embodiment 2

[0044] The bridge cap of a river-crossing bridge at the estuary is a large-volume concrete structure, which is a cylindrical structure with a bottom diameter of 40m and a height of 6m (that is, the design thickness h), and the total concrete consumption is 7500m 3 ; During the construction of the platform cap, it is poured in two layers, and the thickness of the first layer and the second layer is m 1 and m 2 Both are 3m, the design thickness t of mass concrete at the edge is 0.6m, and the slope angle θ is 45°. The specific construction process of this embodiment is the same as that of Embodiment 1, and will not be repeated here.

[0045] The design strength grade of internal low-temperature rising and anti-cracking mass concrete used in this embodiment is C30, and the amount of each material in each cubic meter of internal concrete is: cement 105kg, fly ash 150kg, mineral powder 160kg, sand 795kg, stone 1055kg , water 142kg, superplasticizer 2.1kg, shrinkage reducing agent ...

Embodiment 3

[0053] The bridge cap of a river-crossing bridge is a large-volume concrete structure, which is a cuboid structure with a length of 28m, a width of 19m, and a height of 6m (that is, the design thickness h). The total concrete consumption is 3092m 3 ; During the construction of the platform cap, it is poured in two layers, and the thickness of the first layer and the second layer is m 1 and m 2 Both are 3m, the design thickness t of mass concrete at the edge is 0.5m, and the slope angle θ is 45°. The specific construction process of this embodiment is the same as that of Embodiment 1, and will not be repeated here.

[0054] The design strength grade of internal low-temperature rising and anti-crack mass concrete used in this embodiment is C30, and the amount of each material in each cubic meter of internal mass concrete is: cement 150kg, fly ash 200kg, mineral powder 50kg, sand 750kg, Stone 1100kg, water 160kg, superplasticizer 4kg, shrinkage reducing agent 6kg. The same met...

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Abstract

The invention relates to a construction method for a large-volume concrete structure of a bridge loading platform. Layering pouring is adopted and each layer of concrete is constructed according to the construction method which comprises the following steps: erecting a template; simultaneously pouring the large-volume concrete with high crack resistance and rushing resistance on an edge part and the large-volume concrete with low temperature rise and crack resistance in the interior according to a predesigned slope inclined angle theta, designed thickness t of the large-volume concrete on the edge part and pouring thickness m of the layer; and removing a mould after reaching mould-removing time. According to the construction method provided by the invention, the temperature difference between interior and exterior of the large-volume concrete structure can be controlled within 25 DEG C, without arranging a cooling water pipe in the large-volume concrete structure, such as the bridge loading platform, so as to reduce the risk of temperature cracking. Compared with the process of arranging the cooling water pipe, the construction method provided by the invention is simpler; the incompact plugging caused by later-stage slurry plugging after the cooling water pipe is arranged is avoided; the risk of potential defect of the concrete structure caused by the breaking of the water pipe is reduced; and the washing damage to the concrete structure caused by the water flow carrying sand is resisted.

Description

technical field [0001] The invention belongs to the field of bridge design, in particular to a construction method for a large-volume concrete structure of a bridge with low temperature rise, crack resistance and abrasion resistance. Background technique [0002] At present, there are more than 20 bridges across rivers and seas that have been built or are being built in coastal areas of my country. During the bridge construction process, the crack control of the mass concrete construction of the bridge anchorage, caps, bridge piers and other parts, and the resistance of the caps, piers and other parts in contact with water during the operation period to resist sand (or silt) water flow erosion are related to the long-term durability of the bridge. key issues. The bridge cap is the lower structure of the bridge, which is the connection part between the pile and the column or pier, and the column or pier is built on the cap to form a complete force transmission system. The c...

Claims

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Application Information

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IPC IPC(8): E02D27/14
Inventor 何真丁庆军蔡新华黄修林胡曙光
Owner WUHAN UNIV
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