CN204552756U - 一种超长隧道基础底板滑动层 - Google Patents

一种超长隧道基础底板滑动层 Download PDF

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CN204552756U
CN204552756U CN201520039784.9U CN201520039784U CN204552756U CN 204552756 U CN204552756 U CN 204552756U CN 201520039784 U CN201520039784 U CN 201520039784U CN 204552756 U CN204552756 U CN 204552756U
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sliding layer
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epoxy resin
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麦国文
黄秋筠
谢明鸣
潘伟根
刘热强
吴子超
林顺添
黄健
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Guangdong Provincial Architectural Engineering Machinery Construction Co Ltd
Guangdong Construction Engineering Group Co Ltd
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Guangdong Construction Engineering Group Co Ltd
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Abstract

本实用新型涉及隧道施工技术领域,更具体的涉及一种超长隧道基础底板滑动层,其特征在于:所述滑动层包括底漆(2)、中漆(3)和面漆(4),所述底漆(2)均匀涂抹于混凝土垫层(1)上,所述中漆(3)均匀涂抹于底漆(2)上,所述面漆(4)均匀涂抹于中漆(3)上,所述底漆(2)、中漆(3)和面漆(4)的材料均为环氧树脂。本实用新型能有效降低底板与垫层之间摩擦力,使基础底板混凝土受力变形可以产生相对自由移动,从而有效地抑制了裂缝的产生;且环氧树脂滑动层附着力强,可常温操作、施工简便、并保证施工质量;另外环氧树脂滑动层不但具有密实、防水、抗渗漏、强度高等特点,且价格适中,能有效降低工程成本。

Description

一种超长隧道基础底板滑动层
技术领域
本发明涉及隧道施工技术领域,更具体的涉及一种超长隧道基础底板滑动层。
背景技术
超长隧道的大面积混凝土防水、抗裂要求高。为了减少隧道的外部约束,降低混凝土裂缝出现的风险,需在基础底板与垫层之间增加一道滑动层,以减少基础底板与垫层之间的摩擦力,使基础底板混凝土受力变形可以产生相对自由移动,从而有效地抑制裂缝的产生。目前,滑动层选用的材料一般为砂层、聚乙烯塑料薄膜、水泥、石灰粉煤灰、细粒沥青混合料等。采用“砂层”做为滑动层,对砂的细度模数、洁净度有较高要求,砂的颗粒和清洁度直接影响滑动层的滑动性能。采用“聚乙烯塑料薄膜”做为滑动层,其抗撕裂强度、防水性能等均较差,易破损、耐磨性差,施工工艺繁琐、施工效率低,难保证其平整、不起皱,施工质量难以保证。采用“水泥”做为滑动层,当周边环境有水时,滑动层中掺有的水泥遇水在短时间内就会发生水化反应,导致滑动层初期摩擦系数较大,后期摩擦系数增长缓慢,不利于结构受力。采用“细粒沥青混合料”做为滑动层,由于细粒沥青混合料中沥青含量较少,且沥青老化较严重,摩擦系数随时间的增长趋势不明显;同时细粒沥青混合料价格昂贵,施工成本高。采用细粒沥青混合料作为滑动层,对混合料的级配要求也严格。采用“石灰粉煤灰土”做为滑动层,如含水量小,则铺设时灰尘大,不符合环保的概念;如含水量大,则铺设时会产生结团,铺设不均匀。
发明内容
本发明为克服上述现有技术所述的至少一种缺陷(不足),提供一种超长隧道基础底板滑动层。
为解决上述技术问题,本发明的技术方案如下:
一种超长隧道基础底板滑动层,其特征在于:所述滑动层包括底漆、中漆和面漆,所述底漆均匀涂抹于混凝土垫层上,所述中漆均匀涂抹于底漆上,所述面漆 均匀涂抹于中漆上,所述底漆、中漆和面漆的材料均为环氧树脂。
与现有技术相比,本发明技术方案的有益效果是:
本发明使用环氧树脂作为隧道基础底板的滑动层,能有效降低底板与垫层之间摩擦力,使基础底板混凝土受力变形可以产生相对自由移动,从而有效地抑制了裂缝的产生;且环氧树脂滑动层附着力强,可常温操作、施工简便、并保证施工质量;另外环氧树脂滑动层不但具有密实、防水、抗渗漏、强度高等特点,且价格适中,能有效降低工程成本。
进一步的,为提高滑动效果,所述底漆的厚度为0.1mm~0.15mm,使用量为0.1kg/㎡~0.15kg/㎡。
进一步的,为提高滑动效果,所述中漆的厚度为1mm~2mm,使用量为1kg/㎡~2kg/㎡。
进一步的,为提高滑动效果,所述面漆的厚度为0.9mm~1.1mm,使用量为0.9kg/㎡~1.1kg/㎡。
附图说明
图1为滑动层结构示意图。
图2为实验装置示意图。
附图标记:1.垫层;2.底漆;3.中漆;4.面漆;5.反力墙;6.横向载荷加载;7.竖向载荷加载;8.力传感器;9.上试块;10.下试块;11.中试块;12.固定装置;13.试验滑动面。
具体实施方式
具体实施例:
如图1所示,一种超长隧道基础底板滑动层,其特征在于:所述滑动层包括底漆2、中漆3和面漆4,所述底漆2均匀涂抹于混凝土垫层1上,所述中漆3均匀涂抹于底漆2上,所述面漆4均匀涂抹于中漆3上,所述底漆2、中漆3和面漆4的材料均为环氧树脂;所述底漆2的厚度为0.1mm~0.15mm,使用量为0.1kg/㎡~0.15kg/㎡;所述中漆3的厚度为1mm~2mm,使用量为1kg/㎡~2kg/㎡;所述面漆4的厚度为0.9mm~1.1mm,使用量为0.9kg/㎡~1.1kg/㎡。
实验数据:
由于地下隧道底板宽度为6.9m~10.7m,足尺试验的空间要求太高,所以根 据实验室条件以1:3~1:5缩小比例进行试验,即试件尺寸2m左右。
另外,由于隧道顶板上覆土达5~8m,顶板底板均较厚,底板与垫层之间实际压应力较大,如通过堆载实现压应力模拟可能需要较大体积的堆重,且压应力调整不便,所以本实验采用油压千斤顶加载。
采用三试块双滑动面的试验方案,即固定上下试块,推动中间试块。方案试验装置如图2所示。
底板无滑动层的实验数据
底板有滑动层的实验数据
经过以上仿真试验,得出涂抹滑动层前后底板与垫层之间的滑动摩擦系数,通过两组数据的对比,验证了环氧树脂滑动层具有较好的滑动作用。
显然,本发明的上述实施例仅仅是为清楚地说明本发明所作的举例,而并非是对本发明的实施方式的限定。对于所属领域的普通技术人员来说,在上述说明的基础上还可以做出其它不同形式的变化或变动。这里无需也无法对所有的实施 方式予以穷举。凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等,均应包含在本发明权利要求的保护范围之内。

Claims (4)

1.一种超长隧道基础底板滑动层,其特征在于:所述滑动层包括底漆(2)、中漆(3)和面漆(4),所述底漆(2)均匀涂抹于混凝土垫层(1)上,所述中漆(3)均匀涂抹于底漆(2)上,所述面漆(4)均匀涂抹于中漆(3)上,所述底漆(2)、中漆(3)和面漆(4)的材料均为环氧树脂。
2.根据权利要求1所述的超长隧道基础底板滑动层,其特征在于,所述底漆(2)的厚度为0.1mm~0.15mm,使用量为0.1kg/m2~0.15kg/m2
3.根据权利要求2所述的超长隧道基础底板滑动层,其特征在于,所述中漆(3)的厚度为1mm~2mm,使用量为1kg/m2~2kg/m2
4.根据权利要求3所述的超长隧道基础底板滑动层,其特征在于,所述面漆(4)的厚度为0.9mm~1.1mm,使用量为0.9kg/m2~1.1kg/m2
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105986579A (zh) * 2015-11-20 2016-10-05 周瑞华 一种用于地下综合管廊混凝土构件安装的垫层

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105986579A (zh) * 2015-11-20 2016-10-05 周瑞华 一种用于地下综合管廊混凝土构件安装的垫层

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