CN108638591B - 一种碳素钢-混凝土/水泥砂浆-不锈钢复合海底管道 - Google Patents
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Abstract
本发明提供了一种碳素钢‑混凝土/水泥砂浆‑不锈钢复合海底管道，属于海洋结构工程技术领域。该复合海底管道由沿该管道轴向依次设置的若干个复合子管道拼接而成，各复合子管道结构相同，均包括具有圆形横截面且同心放置的外层碳素钢管和内层不锈钢管，外层碳素钢管和内层不锈钢管之间填充混凝土或水泥砂浆形成具有圆环形横截面的夹层结构。相邻的两复合子管道之间通过混凝土/水泥砂浆覆盖内层不锈钢管道焊缝，可以有效提高焊缝处内层不锈钢管的疲劳性能。本发明提供的复合海底管道结构，可显著提高管道整体的力学性能和对传输介质的耐腐蚀性，又兼具保温性。
Description
技术领域
本发明属于海洋结构工程技术领域，具体涉及一种碳素钢-混凝土/水泥砂浆-不锈钢复合海底管道。
背景技术
海底管道是海洋油气开发的一种重要结构组成，通过材料强度特性，保护管道内传输介质免受管道外复杂环境的影响，保障了油气等资源的不间断传输，承担着大部分油气田输送的重要任务。但是，在服役过程中，海底管道受到内部或外部、人为或自然因素的影响，可能发生结构损伤与材料老化，这种损伤的积累可能导致海底管道发生断裂破坏、腐蚀泄漏等事故。近年来，油气介质中二氧化碳(CO2)或硫化氢(H2S)易腐蚀成分变化造成管道腐蚀泄漏、海洋活动产生落锚造成管道结构损伤等事故日益频繁，尽管海底管道技术经过长足的发展，但目前海底管道结构形式难以满足力学性能和耐腐蚀性的要求，事故日益增加。比如传统单层和双层海底管道，在传输含有一定二氧化碳(CO2)或硫化氢(H2S)成分的油气介质时，通过设计腐蚀裕量的方法难以满足耐腐蚀性要求。双金属复合管，通过内层不锈钢管提升结构耐腐蚀性。但内层不锈钢管和外层混凝土在计算管道整体力学性能时，因其分别通过机械复合和外包粘结连接碳素钢管，一般不作考虑，使得双金属复合管在恶劣环境下可能难以满足力学性能的要求。
发明内容
本发明的目的是为了克服已有技术的不足之处，提供一种碳素钢-混凝土/水泥砂浆-不锈钢复合海底管道结构，本发明可显著提高管道整体的力学性能和耐腐蚀性，又兼具保温性能。
为实现上述目的，本发明采用的技术方案如下：
本发明提出的一种碳素钢-混凝土/水泥砂浆-不锈钢复合海底管道，其特征在于，由沿该管道轴向依次设置的若干个复合子管道拼接而成，各复合子管道结构相同，均包括具有圆形横截面且同心放置的外层碳素钢管和内层不锈钢管，所述外层碳素钢管和内层不锈钢管之间填充混凝土或水泥砂浆形成具有圆环形横截面的夹层结构。
进一步地，相邻两所述复合子管道之间按照以下方式连接：连接处的两个复合子管道的内层不锈钢管轴向长度均超出外层碳素钢管和夹层结构第一长度，内层不锈钢管对准后采用环向焊接；将长为2倍第一长度的两个连接结构分别覆盖在连接处的内层不锈钢管两外侧，各连接结构均由同心放置的内层混凝土或水泥砂浆半圆环和外层碳素钢半圆环一体成型，且内层混凝土或水泥砂浆半圆环的内侧与连接处的内层不锈钢管外侧紧密接触；将两个外层碳素钢半圆环对准后进行轴向焊接；将焊接好的两个外层碳素钢半圆环和两侧复合子管道的外层碳素钢管对准后进行环向焊接。
本发明的有益效果为：夹层混凝土或水泥砂浆与内外钢管的组合作用，可显著提高管道整体的力学性能；内层不锈钢管的材料特性提供了优异的耐腐蚀性；采用混凝土或水泥砂浆提供了一定的的保温性能；通过混凝土或水泥砂浆覆盖内层管道焊缝，可以有效提高焊缝处内层不锈钢管的疲劳性能。本发明的内层不锈钢的中空夹层钢管混凝土海底管道结构可应用于服役环境恶劣和油气腐蚀的海洋环境中。
附图说明
图1是本发明实施例中复合子管道的横截面示意图；
图2是本发明实施例中相邻两复合子管道的连接示意图。
具体实施方式
以下结合附图和实施例对本发明进一步详细说明如下：
本发明实施例的一种碳素钢-混凝土/水泥砂浆-不锈钢复合海底管道，由沿该管道轴向依次设置的若干个复合子管道拼接而成，各复合子管道结构相同，其横截面参见图1，均包括具有圆形横截面且同心放置的外层碳素钢管1和内层不锈钢管3，外层碳素钢管1和内层不锈钢管3之间填充混凝土或水泥砂浆形成具有圆环形横截面的夹层结构2。
外层碳素钢管1直径在6-60寸，直径与壁厚比小于等于45，直径与壁厚比的最小值由经济性和产品工艺决定，一般大于15。外层碳素钢管1直径与内层不锈钢管3直径比值为0.25～0.75。填充物为混凝土或者水泥砂浆，夹层结构2厚度大于等于30mm，夹层结构2厚度的最大值满足外层碳素钢管1直径与内层不锈钢管3直径比取值范围。当夹层填充混凝土时，一般要求夹层结构2厚度大于等于混凝土中骨料粒径的3倍。内层不锈钢管3壁厚不小于2mm。外层碳素钢管1直径Do与其壁厚to的比值Do/to小于内层不锈钢管3直径Di与其壁厚ti的比值Di/ti，以保障轴压极限荷载作用下，外层碳素钢管先于内层不锈钢管达到其极限轴向承载能力。
进一步地，本发明实施例中相邻两复合子管道之间的连接方式如图2所示，连接处的两个复合子管道的内层不锈钢管3轴向长度均超出外层碳素钢管1和夹层结构2约200-400mm(根据具体工程拟定，本实施例为250mm)，内层不锈钢管3对准后采用环向a焊接，将长约为400-800mm(根据具体工程拟定，本实施例为500mm)的两个连接结构分别覆盖在连接处的内层不锈钢管3两外侧，两个连接结构均由同心放置的内层混凝土或水泥砂浆半圆环4和外层碳素钢半圆环5(该外层碳素钢半圆环的尺寸与两侧外层碳素钢管的尺寸相等)一体成型，且内层混凝土或水泥砂浆半圆环4的内侧与连接处的内层不锈钢管3外侧紧密接触，再将两个外层碳素钢半圆环5对准后进行轴向b焊接，最后将焊接好的两个外层碳素钢半圆环5和两侧复合子管道的外层碳素钢管1对准后进行环向c焊接。
本发明实施例中的各组成部件均采用市售材料通过常规制备工艺得到，其中，混凝土采用普通混凝土、轻骨料混凝土或再生混凝土中的任意一种。
以上所述仅为本发明的较佳实施例而已，并非限定本发明的保护范围，凡在本发明的精神和原则之内所做的任何修改、等同替换、改进等，均包含的本发明的保护范围内。
Claims (2)
1.一种碳素钢-混凝土/水泥砂浆-不锈钢复合海底管道，其特征在于，由沿该管道轴向依次设置的若干个复合子管道拼接而成，各复合子管道结构相同，均包括具有圆形横截面且同心放置的外层碳素钢管和内层不锈钢管，所述外层碳素钢管和内层不锈钢管之间填充混凝土或水泥砂浆形成具有圆环形横截面的夹层结构；
相邻两所述复合子管道之间按照以下方式连接：连接处的两个复合子管道的内层不锈钢管轴向长度均超出外层碳素钢管和夹层结构第一长度，内层不锈钢管对准后采用环向焊接；将长为2倍第一长度的两个连接结构分别覆盖在连接处的内层不锈钢管两外侧，各连接结构均由同心放置的内层混凝土或水泥砂浆半圆环和外层碳素钢半圆环一体成型，且内层混凝土或水泥砂浆半圆环的内侧与连接处的内层不锈钢管外侧紧密接触；将两个外层碳素钢半圆环对准后进行轴向焊接；将焊接好的两个外层碳素钢半圆环和两侧复合子管道的外层碳素钢管对准后进行环向焊接；
所述混凝土采用普通混凝土、轻骨料混凝土或再生混凝土中的任意一种。
2.根据权利要求1所述的碳素钢-混凝土/水泥砂浆-不锈钢复合海底管道，其特征在于，所述第一长度的取值为200-400mm。
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| CN108638591B (zh) * | 2018-07-02 | 2023-04-18 | 清华大学 | 一种碳素钢-混凝土/水泥砂浆-不锈钢复合海底管道 |
| CN112227603A (zh) * | 2020-11-06 | 2021-01-15 | 福州大学 | 新型填充钢渣废玻璃混凝土的钢管混凝土组合柱及其制备方法 |
| JP7498160B2 (ja) | 2021-09-07 | 2024-06-11 | Ｊｆｅシビル株式会社 | 鋼管コンクリート柱、鋼管コンクリート柱と鉄骨梁の接合構造及びその構築方法 |
| CN114277937B (zh) * | 2022-02-08 | 2023-06-09 | 华北理工大学 | 中空夹层钢管混凝土构件连接结构、组合结构及施工方法 |
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| CN205171830U (zh) * | 2015-11-11 | 2016-04-20 | 清华大学 | 一种外衬不锈钢复合钢管混凝土构件 |
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| CN108638591B (zh) * | 2018-07-02 | 2023-04-18 | 清华大学 | 一种碳素钢-混凝土/水泥砂浆-不锈钢复合海底管道 |
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- 2018-07-02 CN CN201810705266.4A patent/CN108638591B/zh active Active
- 2018-11-01 US US17/257,174 patent/US11592124B2/en active Active
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| CN108638591A (zh) | 2018-10-12 |
| US11592124B2 (en) | 2023-02-28 |
| WO2020006947A1 (zh) | 2020-01-09 |
| US20210180726A1 (en) | 2021-06-17 |
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