[1]晏伟,唐善军,孙世鹏,等.内置钢浮筒助浮用于大口径超长超弯钢管沉管施工[J].中国给水排水,2024,40(24):92-98.
　YANWei,TANGShan-jun,SUNShi-peng,et al.Application of Built-in Steel Pontoon Floating-aid Technology in Construction of Large Diameter, Super Long and Super Bending Steel Immersed Tube[J].China Water & Wastewater,2024,40(24):92-98.
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内置钢浮筒助浮用于大口径超长超弯钢管沉管施工

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第40卷 期数: 2024年第24期 页码: 92-98 栏目: 出版日期: 2024-12-17
Title:
Application of Built-in Steel Pontoon Floating-aid Technology in Construction of Large Diameter, Super Long and Super Bending Steel Immersed Tube
作者:
晏伟1， 唐善军1， 孙世鹏1， 王健2， 路佳3
（1.广州打捞局，广东 广州 510220；2.上海市政工程设计研究总院<集团>有限公司，上海 200092；3.南宁市排水有限责任公司，广西 南宁 530028）
Author(s):
YAN　Wei1， TANG　Shan-jun1， SUN　Shi-peng1， WANG　Jian2， LU　Jia3
（1. Guangzhou Salvage Bureau， Guangzhou 510220， China； 2. Shanghai Municipal Engineering Design and Research Institute Co. Ltd.， Shanghai 200092， China； 3. Nanning Drainage Co. Ltd.， Nanning 530028， China）
关键词:
钢浮筒;  助浮;  大口径钢管;  超长钢管;  沉管
Keywords:
steel pontoon;  floating?aid;  large diameter steel pipe;  super long steel pipe;  immersed tube
摘要:
南宁邕江引水工程过邕江段管线长度438 m、直径2.62 m、壁厚28 mm、质量784 t，采用外置浮筒、气囊助浮沉管技术于2019年6月整体成功沉放。在外置钢浮筒沉管沉放过程中遇到气囊消气不及时、消气时间过长的问题，增加了航道封航时间。外置钢浮筒导致迎流面积增大，钢浮筒所受水流力同步作用于过江管，需要配置较大的下沉力才能保证安全沉管。过江管在旋转摆正的过程中浮筒钢丝绳与管体接触产生勒痕，破坏了过江管的涂层。针对上述问题提出改进方案，利用内置钢浮筒沉管的方式，通过模型计算后可合理控制下沉受力，在大口径管线沉管过程中减少迎流面积，避免钢浮筒受到水流力影响，大幅降低下沉配重要求。吊绳在下沉控制中的受拉均匀性均有较大程度改善，缩短了沉管过程封航时间。内置浮筒助浮是在航运繁忙河段条件下，针对大口径长距离管线整体沉管的一种经济、安全的施工技术。
Abstract:
The pipeline with length of 438 m, diameter of 2.62 m, wall thickness of 28 mm and mass of 784 t in Nanning Yongjiang River diversion project, was successfully sunk in June 2019 with the external pontoon and airbag floating-aid technology for immersed tube. In the process, the airbag de- aeration is not timely and takes too much time, which increases the closure time of the channel. The external steel pontoon increases the area facing the flow, and the bearing water force of it acts on the crossing pipe synchronously, so it is necessary to allocate a large sinking force to ensure safe pipe sinking. In the process of rotating and straightening the river crossing pipe, the contact between the float wire rope and the pipe body produces ligature marks, which destroys the coating of the river crossing pipe. In view of the above problems, an improved scheme is proposed. The sinking force can be rationally controlled by using the method of built-in steel pontoon for immersed tube through model calculation, which can reduce the flow area in the process of large-caliber pipeline sinking, keep the steel pontoon away from the flow force, and greatly reduce the sinking weight requirement. The uniformity of the rope tension in sinking control is improved to a great extent, and the closure time is shortened during the sinking process. The built-in steel pontoon floating-aid is economical and safe for the integral immersed tube of large diameter and long distance in busy river section.
更新日期/Last Update: 2024-12-17