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Anti-cracking UHPC open caisson structure and construction method thereof

A construction method and concrete technology, which can be used in basic structure engineering, caisson, construction, etc., can solve problems such as the risk of large cracking of caisson, and achieve the effects of improving easy bleeding, enhancing tensile properties, and enhancing performance.

Active Publication Date: 2019-12-03
CCCC SECOND HARBOR ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] After years of development, the design method and construction technology of the caisson have gradually matured, but there is a huge risk of cracking in the caisson during the sinking construction process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1. After the caisson structure design is completed, the stress calculation is carried out, and the potential cracking area is determined according to the tensile stress exceeding the allowable tensile strength of ordinary concrete;

[0036] Step 2: Use UHPC concrete to pour the potential cracking area determined in Step 1.

[0037] In Example 1, before the caisson is poured, the structural calculation of the designed caisson is carried out, and the distribution of the tensile stress area at the bottom of the caisson under different working conditions and different support conditions is calculated, and the potential is determined according to the tensile stress exceeding the allowable tensile strength of ordinary concrete In the cracking area, when pouring concrete, use UHPC concrete to pour the potential cracking area. Among them, the confirmation method of the potential cracking area at the bottom of the caisson is as follows: After the design of the caisson is co...

Embodiment 2

[0044] A kind of construction method of tensile crack UHPC concrete caisson structure, comprises the following steps:

[0045] Step 1. Determine the potential cracking area at the bottom of the caisson; the confirmation method for the potential cracking area at the bottom of the caisson is as follows: After the design of the caisson is completed, after the sinking scheme is determined, calculate the caisson under different support conditions and different working conditions The stress distribution of the bottom surface should generally include the working conditions of each subsidence, the full-section supporting condition, and the large pot bottom supporting condition, and determine the potential cracking area of ​​the caisson bottom under each working condition according to the allowable tensile stress , the final determined potential cracking area should be able to cover the potential cracking area under all working conditions;

[0046] Step 2: Use UHPC concrete to pour the...

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Abstract

The invention discloses an anti-cracking UHPC open caisson structure and a construction method thereof. The anti-cracking UHPC well sinking structure comprises a first layer UHPC layer which is positioned in a potential cracking area at the bottom of an open caisson. According to the anti-cracking UHPC open caisson structure, UHPC is used in a bottom area with greater tensile stress in the sinkingprocess of the open caisson, so that the cracking resistance of the bottom of the open caisson is greatly enhanced and the problem that the open caisson is easy to crack in the sinking process is solved.

Description

technical field [0001] The invention relates to the field of caisson structures. More specifically, the present invention relates to a tensile crack-resistant UHPC concrete caisson structure and a construction method thereof. Background technique [0002] The caisson foundation has a large embedment depth, strong integrity and good stability, and has been widely used in the anchorage of long-span bridges in recent years. In the caisson construction process, the caisson body is first made on the ground or pit, that is, the caisson component body with openings and made of reinforced concrete is made. After the caisson body reaches a certain strength, the soil is excavated in layers in the shaft. , Soil transportation, as the soil surface in the well gradually decreases, the caisson body overcomes the frictional resistance between the outer wall of the caisson and the soil layer by its own weight, and sinks continuously to reach the predetermined construction design position. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D23/00E02D23/08C04B28/00C04B20/02
CPCC04B20/023C04B28/00E02D23/00E02D23/08C04B22/002C04B18/0409C04B14/106C04B14/104
Inventor 张鸿张永涛陈鸣陈培帅饶为胜孔茜李德杰罗会武贺祖浩邱敏石章入肖盈姚翔川吴诗琦
Owner CCCC SECOND HARBOR ENG
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