Cast-in-place box girder low-temperature steam maintenance operating method

A low-temperature steam and construction method technology, applied in the field of construction engineering, can solve the problems of no detailed description in the early stage and the difficulty of steam curing, etc., and achieve the effect of controlling concrete cracks and ensuring uniformity

Inactive Publication Date: 2006-09-13
SHANGHAI TUNNEL ENGINEERING CO. LTD.
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

It has a certain guiding effect on the steam curing process of concrete beams, but there is no detailed description of the preliminary preparations for steam curing of concrete box girders. At the same time, prestressed concrete beams are usually manufactured in factories or in specific beam making sites, and steam curing is used. It is less affected by the external climate, but the construction site of cast-in-place concrete beams is limited by conditions, so steam curing is very difficult

Method used

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Examples

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Embodiment Construction

[0032] Provide following embodiment in conjunction with content of the present invention:

[0033] Taking the cast-in-place box girder of a shallow sea section of a cross-sea bridge as an example, the project is located in the northern sea area of ​​a certain bay. The climate belongs to the southern edge of the northern subtropical zone and the East Asian monsoon prevails. Affected by the monsoon, it is cold in winter and hot in summer, with four distinct seasons, large temperature difference between day and night, and typhoons. Prevailing and complex climate change. The cast-in-place box girder in the shallow sea section is a prestressed reinforced concrete single-box structure, using high-performance C50 marine concrete, with a span of 50m, and using a bridge-building machine (mobile formwork support system) to cast in-situ span by span. The design requires that the concrete reach 80% of the design strength Only then can the next span be constructed.

[0034] details as fol...

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PUM

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Abstract

A low-temp steam curing method for in-situ cast box beam includes such steps as spraying insulating layer on external mould, laying down steam tubes, building steam curing shed, burying a temp strain gauge at each measuring point, parallelly connecting them via a switch to a reader, laying aside, heating, making temp constant, cooling and post curing. Its advantages are high speed, high strength and no crack.

Description

technical field [0001] The invention relates to a method in the field of construction engineering, in particular to a low-temperature steam curing construction method for a cast-in-place box girder. Background technique [0002] With the continuous and rapid development of my country's economy, the construction market of urban elevated roads and highways and bridges across seas, rivers, valleys, etc. will continue to grow, and the construction scale will become larger and larger. key factor. In general, the concrete beam adopts the natural curing method, that is, under the natural condition that the average temperature is higher than +5°C, the concrete surface is covered with appropriate materials and watered for curing, so that the concrete maintains the cement water within a certain period of time. The appropriate temperature and humidity conditions required for chemicalization. The natural curing method is simple and easy to operate, but the growth rate of concrete stren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B11/24
Inventor 温锁林董海斌孙永华侯育华
Owner SHANGHAI TUNNEL ENGINEERING CO. LTD.
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