大断面钢壳自密实混凝土管节浮态浇筑模型试验研究

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (4): 1238-1242.

大断面钢壳自密实混凝土管节浮态浇筑模型试验研究

陈灿, 王雪刚, 范志宏, 于方, 曾俊杰

中交四航工程研究院有限公司,水工构造物耐久性技术交通运输行业重点实验室,广州 510230

收稿日期:2021-01-08 修回日期:2021-02-27 出版日期:2021-04-15 发布日期:2021-05-11
作者简介:陈灿(1994—),男,硕士研究生。主要从事高性能混凝土方面的研究。E-mail:787781353@qq.com
基金资助:
广东省重点领域研发计划(2019B111105002)

Floating Pouring Model of Large-Section Steel-Shell Self-Compacting Concrete Pipe Joint

CHEN Can, WANG Xuegang, FAN Zhihong, YU Fang, ZENG Junjie

Key Laboratory of Harbor & Marine Structure Durability Technology of Transportation Industry,CCCC Forth Harbor Engineering Institute Co., Ltd., Guangzhou 510230, China

Received:2021-01-08 Revised:2021-02-27 Online:2021-04-15 Published:2021-05-11

摘要/Abstract

摘要： 深中通道沉管隧道具有超大跨度、超宽、大回淤等特点,其采用钢壳包裹素混凝土的结构使钢壳制作与混凝土浇筑实现了场地分离,为验证深中通道钢壳自密实混凝土管节施工工艺可行性,进行了大断面模型试验,对自密实混凝土性能、钢壳浮态预制浇筑工艺和模型结构质量进行研究,确保管节在施工过程的可靠性。通过对自密实混凝土的制备,混凝土拌合物性能满足流动性、填充性和抗离析性能等基本性能要求。结果表明,通过对大断面模型浮态浇筑试验中模型混凝土温度和应变监测、抗压强度测试,钢壳自密实混凝土的温度得到了较好控制,所配制的自密实混凝土具有较好的体积稳定性。混凝土28 d抗压强度均在50 MPa以上,其密实性和匀质性较好,满足配制指标要求,钢壳沉管自密实混凝土浮态浇筑施工工艺可行。

关键词: 沉管隧道, 大断面, 自密实混凝土, 浮态浇筑, 模型试验

Abstract: The deep-medium passage immersed tube tunnel has the characteristics of super large span, super wide, and large back silt, etc. It adopts a steel-shell wrapped plain concrete structure to separate the steel shell production from the concrete pouring. In order to verify the deep-medium passage steel-shell self-compacting concrete pipe section for the feasibility of construction process, large-section model tests were carried out to study the properties of self-compacting concrete, the precast pouring process of steel-shell floating state and the quality of the model structure to ensure the reliability of pipe joints in the construction process. The results show that, through the preparation of self-compacting concrete, the performance of the concrete mixture meets the basic performance requirements of fluidity, filling and segregation resistance. Through monitoring the temperature and strain of the model concrete and testing the compressive strength in the large-section model floating pouring test, the temperature of the steel-shell self-compacting concrete has been well controlled, and the self-compacting concrete prepared has a good volume stability. The 28 d compressive strength of concrete is above 50 MPa, and its compactness and homogeneity are good, and it meets the requirements of the compounding index. The construction process of floating self-compacting concrete with steel-shell immersed pipe is feasible.

Key words: immersed tube tunnel, large-section, self-compacting concrete, floating pouring, model test

中图分类号:

U454

陈灿, 王雪刚, 范志宏, 于方, 曾俊杰. 大断面钢壳自密实混凝土管节浮态浇筑模型试验研究[J]. 硅酸盐通报, 2021, 40(4): 1238-1242.

CHEN Can, WANG Xuegang, FAN Zhihong, YU Fang, ZENG Junjie. Floating Pouring Model of Large-Section Steel-Shell Self-Compacting Concrete Pipe Joint[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(4): 1238-1242.

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