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Large-gradient special-shaped sloping roof concrete construction system and construction method thereof

A construction method and technology of sloping roof, applied in the direction of roof, formwork/formwork/work frame, building components, etc., can solve the problems of difficult construction joints, inconvenient operation, limited operating space for sloping roofs, etc., and achieve convenient placement and fine-tuning. , easy to set effect

Pending Publication Date: 2022-01-07
THE FIRST COMPARY OF CHINA EIGHTH ENG BUREAU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since the existing sloping roofs are poured in stages, the pouring method is hanging pots. In addition, especially for special-shaped sloping roofs, especially this kind of hollow roof, the operation space of sloping roofs is small, the operation is inconvenient, and the pouring efficiency is low.
Causes transverse cracks in the center of the plate
Moreover, the pouring operation cannot be completed within one day, and the single pouring time is too long, and many construction joints and cold joints are formed on the roof slab
When the first-level concrete is poured, the installation of the next-level formwork will be interspersed, which will affect the roof pouring speed; due to the limited operating space of the sloping roof, the pouring operation should be done during the day, and it is more dangerous to pour at night due to the influence of light
After the construction is completed using traditional techniques, the quality effect is not satisfactory
After the pouring work was completed on the same day, it was very difficult to deal with the construction joints, and quality defects such as honeycombs and pockmarks appeared after the formwork was removed

Method used

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  • Large-gradient special-shaped sloping roof concrete construction system and construction method thereof
  • Large-gradient special-shaped sloping roof concrete construction system and construction method thereof
  • Large-gradient special-shaped sloping roof concrete construction system and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] According to the calculation formula f cu,O ≥f cu,k +1.645σ (σ=5.0MPa), calculate the preparation strength: f cu,o =20+1.645×5.0=28.2MPa.

[0074] According to the calculation formula W / C=(a a × f ce )÷(f cu,o +a a ×a b × f ce ), calculate the water-cement ratio: W / C=(0.46×42.5)÷(28.2+0.46×0.07×42.5)=0.66;

[0075] According to the requirements of concrete slump, particle size distribution of aggregates and water-reducing effect of admixtures, the unit water consumption W is determined to be 175kg / m 3 Among them, the amount of water reducing agent is 1.0% of the amount of gelling material, the amount of accelerator is 3.5% of the amount of gelling material, and the benchmark water-binder ratio for trial matching is 0.43.

[0076] According to the calculation formula, the calculated benchmark cementitious material consumption is 407kg / m 3 ; and its benchmark cement consumption is 407kg / m 3 .

[0077] Calculate the amount of coarse and fine aggregates using th...

Embodiment 2

[0081] According to the benchmark water-binder ratio, reduce the water-binder ratio by 0.03, and calculate the concrete mix ratio.

[0082] Among them, W / C=0.40, the water-cement ratio is reduced by 0.03, and the sand rate is reduced by 1%. According to the mass ratio, the ratio of cement, fly ash, river sand, gravel, water, and water reducing agent is as follows: 309:103 :829:1013:165:4.12.

[0083] According to its specific ratio, try mixing 35L to check the performance of the mixture, wherein the cement, fly ash, river sand, gravel, water, and water reducing agent are respectively 10.82:3.61:29.02:35.46:5.78:0.144, And its unit is kg.

[0084] Through observation, the measured slump is 170mm, the gas content is 3.3%, the workability is good, and the measured density is 2430kg / m 3 , and according to the calculation, the density does not need to be adjusted.

Embodiment 3

[0086] Increase the water-binder ratio by 0.03 according to the benchmark water-binder ratio, and calculate the concrete mix ratio:

[0087] Wherein, W / C=0.46, the water-cement ratio increases by 0.03, and the sand rate increases by 1%. According to the mass ratio, the proportion of cement, fly ash, stone, water, and water reducing agent is as follows: 269:90:891 :1005:165:3.59.

[0088] According to its specific ratio, try mixing 35L to check the performance of the mixture, wherein the cement, fly ash, river sand, gravel, water, and water reducing agent are respectively 9.42, 3.15, 31.19, 35.18, 5.78, 0.126, And its unit is kg.

[0089] The measured slump is 170mm, the gas content is 3.3%, the workability is good, and the measured density is 2420kg / m 3 , and according to the calculation, the density does not need to be adjusted.

[0090] As shown in the table below, the three groups of mix ratios were tested for 7, 28, and 56 days of strength respectively. According to th...

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Abstract

The invention provides a construction method of a large-gradient special-shaped sloping roof concrete construction system. The construction method of the large-gradient special-shaped sloping roof concrete construction system comprises the following steps that a full framing system is built firstly, then a bottom formwork and an outer formwork are erected, and the outer formwork is reinforced; a double-formwork structure is adopted, a vibration space facilitating vibration of a direct inserted type vibration rod is formed in a steel bar system, an inclined roof panel formed after casting is clamped between the bottom formwork and the outer formwork, the bottom formwork and the outer formwork can enable the surface flatness of the inclined roof panel to be good, the honeycomb and pitted surface phenomena do not exist, and the inclined roof panel is well connected with a connecting position. According to the large-gradient special-shaped sloping roof concrete construction system, the arrangement of pre-embedded supporting pieces particularly facilitates the arrangement of the steel bar system and the placement and fine adjustment of a whole top formwork; meanwhile, in order to ensure the vibration effect of the inserted type vibration rod, radians are intermittently arranged on transverse steel bars in the steel bar system.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a concrete construction system and a construction method for a large-slope special-shaped sloped roof. Background technique [0002] The inclined roof is widely used in architectural design because of its superior drainage function and the aesthetics of the roof shape. However, due to the high floor elevation, the formwork support system often belongs to the high formwork; for the shape, the inclined planes at different angles are designed to intersect, and the formwork The construction is very difficult, which greatly increases the construction period; due to the large slope of the slope, the slope length is also large. Concrete pouring is difficult to control, prone to lateral shrinkage cracks, and it is difficult to pour concrete on sloped roofs, especially at the knuckles, which is prone to leakage and has great hidden dangers. [0003] In the existing construc...

Claims

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Application Information

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IPC IPC(8): E04B7/00E04G11/36E04G11/48E04G21/02E04G21/00
CPCE04B7/00E04G11/36E04G11/48E04G21/02E04G21/00
Inventor 周春雨程飞王亚坤刘明浩修天翔毕磊郭小伟邓绪清胡伟锋刘振东
Owner THE FIRST COMPARY OF CHINA EIGHTH ENG BUREAU LTD
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