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Study on Field Test of Joint Waterproofing of Long-segment Heavy-tonnage Prefabricated Assembled Utility Tunnel
(1. CCCC-SHEC Six Engineering Co., Ltd., Xi'an 710075; 2. CCCC Highway Bridges National Engineering Research Centre Co., Ltd.,Beijing 100120; 3. Shanghai Municipal Engineering Design Institute (Group) Co., Ltd., Shanghai 200092; 4. CCCC-SHEC Engineering Design and Research Institute, Xi'an 710065; 5. Hebei Academy of Building Research Co., Ltd., Shijiazhuang 050021;6. School of Civil Engineering, North China University of Technology, Beijing 100144)
Abstract In order to demonstrate the waterproof performance of the long-segment heavy-tonnage prefabricated assem? bled utility tunnel in the startup zone of Xiong'an New Area, the field test of joint waterproofing of long-segment heavy-tonnage utility tunnel has been conducted, and the waterproof performance of two types of waterstops after water injection and pressurization in different cases has been analyzed. As the results indicate: both types of waterstops can meet the waterproofing requirements for the tunnel in normal operation. In the case of tensioning force induced failure of the two types of waterstops, ClassⅠwaterstop has 2 leakage points and Class Ⅱ waterstop has no leakage point. The reason is that ClassⅠwaterstop is spliced when kept still and the nonuniform splice width at element joint will result in tensioning force induced failure and thus water leakage. In the case of element dislocation of the two types of waterstops, ClassⅠwaterstop has no leakage and Class Ⅱ waterstop has 3 leakage points. The reason is that ClassⅡwaterstop is spliced when suspended and its tensioning force is less than that of ClassⅠwaterstop, so leakage is more likely to occur in the case of dislocation. For this project, it is recommended to use Class Ⅱwaterstop for waterproofing of element joint.
Abstract：
In order to demonstrate the waterproof performance of the long-segment heavy-tonnage prefabricated assem? bled utility tunnel in the startup zone of Xiong'an New Area, the field test of joint waterproofing of long-segment heavy-tonnage utility tunnel has been conducted, and the waterproof performance of two types of waterstops after water injection and pressurization in different cases has been analyzed. As the results indicate: both types of waterstops can meet the waterproofing requirements for the tunnel in normal operation. In the case of tensioning force induced failure of the two types of waterstops, ClassⅠwaterstop has 2 leakage points and Class Ⅱ waterstop has no leakage point. The reason is that ClassⅠwaterstop is spliced when kept still and the nonuniform splice width at element joint will result in tensioning force induced failure and thus water leakage. In the case of element dislocation of the two types of waterstops, ClassⅠwaterstop has no leakage and Class Ⅱ waterstop has 3 leakage points. The reason is that ClassⅡwaterstop is spliced when suspended and its tensioning force is less than that of ClassⅠwaterstop, so leakage is more likely to occur in the case of dislocation. For this project, it is recommended to use Class Ⅱwaterstop for waterproofing of element joint.
MA Huabing1 FENG Liangping2 WANG Hengdong3 XIAN Jianping4 SHANG Dongfan5 CUI Guangyao6
.Study on Field Test of Joint Waterproofing of Long-segment Heavy-tonnage Prefabricated Assembled Utility Tunnel[J] MODERN TUNNELLING TECHNOLOGY, 2024,V61(1): 208-215
2024, Vol. 61 