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Underwater separating type concrete pouring constructing method

A construction method and concrete technology, which is applied in the direction of construction and infrastructure engineering, can solve the problems of non-dispersion, poor quality of underwater pouring, easy to block pipe pouring, etc., achieve good dispersion resistance and fluidity, and reduce aggregate segregation , to avoid the effect of direct contact

Inactive Publication Date: 2015-04-01
THREE GORNAVIGATION AUTHORITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For the concrete used for underwater pouring, it is often necessary to have underwater non-dispersibility, good fluidity, and self-compacting properties. It is necessary to add admixtures such as flocculants, and the cost per unit volume will increase by nearly double. Afterwards, its own viscosity increases, and it is very easy to block the pipe when pumping, causing pouring interruption, and the overall cost is high
If normal concrete is used for underwater pouring, although it can solidify and harden underwater, the quality of underwater pouring is poor. The main reason is that the concrete is easy to contact with environmental water, resulting in an increase in its water-cement ratio and aggregate segregation, which affects concrete pouring. quality

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  • Underwater separating type concrete pouring constructing method
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  • Underwater separating type concrete pouring constructing method

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Embodiment 1

[0031] Cement slurry medium preparation: prepare a cement slurry medium with a specific gravity between water and concrete, homogeneous, viscous itself, but with good fluidity, as follows: the water-cement ratio of the cement slurry medium is 0.5-0.7 Between, density 1.6~1.7g / cm 3 . Add BT-7000 retarder to the cement slurry medium to control the initial setting time of the cement slurry to not less than 4 hours; add BT-7003 flocculant to the cement slurry medium to reduce cement slurry precipitation and increase the anti-dispersion of the cement slurry itself sex. In order to further prolong the retarding time of the medium and increase the homogeneity and fluidity of the medium, fly ash is added to the cement slurry medium. The fly ash grade is Class II. According to the equivalent replacement method, the dosage is 1 / 2 of the cement amount. 25%.

[0032] Construction steps: In the designated area for underwater pouring, under the condition that formwork 1 and grooves are r...

Embodiment 2

[0037] The following is a further detailed description of the present invention in conjunction with an example of underwater restoration of the apron end scoured downstream of a power station overflow dam in Hubei, but the implementation scope and method of the present invention are not limited thereto.

[0038] According to the underwater survey report, the stilling pool downstream of the overflow dam of the power station, the apron behind the pool, and the riverbed have experienced years of flooding during the flood season. The total length is 48m (such as Figure 5 ), the maximum scour height is 9m (compared to the original river bed surface), and the maximum scour depth of the apron foundation from the end of the apron to the upstream direction is 7m, thus forming an overhang at the end of the apron, and the hollowed out parts are all underwater. The depth range is 8-20m, and there are great potential safety hazards. According to the design plan, it is necessary to backfi...

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Abstract

The invention provides an underwater separating type concrete pouring construction method. The method is characterized in that cement paste is introduced as a medium layer during underwater pouring, so that concrete, cement paste and water can be automatically layered under the gravity effect, and as a result, the concrete can be separated from environmental water all the time; in addition, a tremie can horizontally move in the cement paste, and concrete can be vibrated underwater, so that the underwater pouring constructing quality is improved. According to the method, the medium layer prepared from cement paste is high in mobility, dispersion resistance and homogeneity, and the separating effect is achieved through the specific gravity characteristics of the medium layer, so that the concrete under underwater pouring can be vibrated without widely directly contacting with environmental water, and as a result, the underground pouring quality can be improved; large-placed area and large size general underground water pouring construction can be achieved; the process is simple, the construction quality is greatly improved, and the construction cost is greatly decreased.

Description

technical field [0001] The invention relates to the technical field of underwater concrete pouring, in particular to an underwater pouring construction method using a cement slurry medium to isolate concrete from environmental water. Background technique [0002] Underwater concrete pouring construction methods, currently known underwater concrete pouring methods include conduit method, bagging method (membrane bag method), grouting method, etc., among which the conduit method is the most commonly used. [0003] The underwater concrete is poured by the conduit method. A hopper is arranged on the upper part, a conduit is connected to the lower part, and an on-off valve is installed at the bottom of the conduit. When pouring, move the conduit to the designated pouring position, the bottom of which is a certain distance from the pouring ground, first fill the conduit with concrete, then open the lower valve, pour the concrete evenly, and lift the conduit slowly. During the pour...

Claims

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Application Information

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IPC IPC(8): E02D15/06
CPCE02D15/06
Inventor 冉晓俊陈国仿史冬庆王辉廖源王黎明古建生周文胜
Owner THREE GORNAVIGATION AUTHORITY
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