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Method for controlling cracking of ultra-long reinforced concrete structures and jacking device

A reinforced concrete and concrete technology, which is applied to the processing of building components, building structures, and building materials, can solve problems such as poor tensile strength, achieve good crack resistance, compensate for shrinkage, and facilitate construction

Active Publication Date: 2014-11-05
ARCHITECTURAL DESIGN & RES INST OF SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Concrete is strong in compression but poor in tension

Method used

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  • Method for controlling cracking of ultra-long reinforced concrete structures and jacking device
  • Method for controlling cracking of ultra-long reinforced concrete structures and jacking device
  • Method for controlling cracking of ultra-long reinforced concrete structures and jacking device

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Experimental program
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Effect test

Embodiment 1

[0069] Such as Figures 11-17 , a method for controlling cracks in super-long reinforced concrete structures: when pouring and tamping super-long reinforced concrete structures, leave post-cast strips of a certain width (matched to the size of the jack) at intervals of a certain distance (30-60m), and place Reinforced concrete structures with large length and width scales are divided into several smaller areas of pre-cast concrete and jacks are installed between the post-cast strips, such as Figure 11 , 12 , the length of the first poured concrete 101 on the left side is L1, the length of the first poured concrete 102 on the right side is L2, the width of the reserved post-casting belt 103 is B, and the original length of the concrete structure L0=L1+L2+B; to be poured first After the concrete reaches a certain strength, use a jack to widen the post-pouring belt, so that the concrete produces prestress, such as Figure 13 , 14 After the jack 107 has made the top of the pos...

Embodiment 2

[0071] Embodiment one is to pour and tamp the back-casting strip concrete after the post-casting strips of the whole structure are pushed away once with a jack. The difference between this embodiment and Embodiment 1 is that the post-casting belt is pushed apart by jacks several times, and the post-casting belt concrete is poured and tamped several times, and it is not necessary to place jacks on each floor.

Embodiment 3

[0073] Embodiment 1 and Embodiment 2 are to set jacks between the post-casting belts, and use the jacks to widen the post-casting belts. Such as Figure 18-22 , In this embodiment, the jacking device is used to directly act on the vertical members on both sides of the post-cast belt instead of the jack to act on the floor structure at the post-cast belt. Such as Figure 18 , the length of the first poured concrete 101 on the left side is L1, the length of the first poured concrete 102 on the right side is L2, the width of the reserved post-casting belt 103 is B, the original length of the concrete structure L0=L1+L2+B, and the supporting device The top seat one and two of 110 produce active force respectively to the left side earlier pouring concrete 101, the right side first pouring concrete 102; Figures 19-22 , after the supporting device 110 makes the top width of the post-casting belt, the length of the first poured concrete 101 on the left side is L1-h1, the length of ...

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Abstract

The invention discloses a method for controlling cracking of ultra-long reinforced concrete structures. The method includes the following steps that post-cast strips of a certain width are reserved for the ultra-long reinforced concrete structures from space to space; the reinforced concrete structures with a large length and a large width are divided into a plurality of small pre-cast concrete areas through the post-cast strips, and concrete is poured in the pre-cast concrete areas; jacking devices which are used for jacking the post-cast strips so that the post-cast strips can be wider are installed between the reserved post-cast strips; when the pre-cast concrete reaches set strength, the post-cast strips are jacked to be wider through the jacking devices, so that prestress of the concrete is generated, meanwhile, concrete of the post-strip strips is repoured, and the positions, where the jacking devices are located, of the post-cast strips are not poured; when the repoured concrete reaches set strength, the jacking devices are removed, concrete is poured in the positions where the jacking devices are located, and the whole floor is repoured completely. According to the method, abeyance time of the post-cast strips can be shortened, construction is convenient to carry out and the anti-cracking effect is good.

Description

technical field [0001] The invention relates to the field of crack control in building structures, in particular to a method for controlling cracks in super-long reinforced concrete structures and a supporting device. Background technique [0002] Due to the shrinkage of the concrete and the temperature change of the super-long reinforced concrete structure, and the constraints of the vertical members on the horizontal members, cracks will appear in the horizontal members. [0003] In order to reduce the cracks of the horizontal members of super-long reinforced concrete structures, the common method is to leave a certain width of post-casting strips at a certain distance, and divide the structure with large length and width into several smaller structures, such as figure 1 , figure 2 , the length of the first poured concrete 101 on the left is L1, the length of the first poured concrete 102 on the right is L2, and the width of the reserved post-cast belt 103 is B, then the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04B1/682E04B1/68E04G21/00
Inventor 舒宣武
Owner ARCHITECTURAL DESIGN & RES INST OF SOUTH CHINA UNIV OF TECH