| 在役锚索预应力检测设备及应用 |
| 投稿时间：2023-06-29 修订日期：2023-10-30 点此下载全文 |
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| 基金项目:中国地质调查局地调项目(DD20230451)、国家重点研发计划项目(2019YFC1509904). |
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| 中文摘要:现有的锚索预应力检测设备要求锚索外露段长度大于70cm,不适应于运维期的在役锚索检测,且重量大都在150kg以上,对于高陡边坡锚索检测显得笨重。为克服以上问题,本文研制了便携式在役锚索预应力智能检测仪HRAD-300,可适用于钢绞线外露长度大于7cm的在役锚索预应力检测。检测仪位移量程200mm,测量误差0.01mm；测力量程300kN,测量误差±1%FS,单件重量小于15kg,总重量小于40kg,便于携带,不受地形影响。基于反拉法原理及检测曲线形态,提出锚下有效预应力算法,并编制了相关软件。室内试验表明,检测曲线形态多为拐点不明显型,计算值与原始锁定值基本一致。使用该设备对邛崃市天台山景区凤凰岩不稳定斜坡锚固工程进行检测,检测结果表明,现场锚索检测曲线多为拐点明显型,具有明显的突变点及陡降；锚索运行状态良好,持续发挥功效, 2#锚索预应力损失较为明显,可以采取补偿张拉方式；同一锚索的不同钢绞线存在受力不均的情况。便携式在役锚索预应力检测仪智能、轻便,可为锚固工程健康评价提供数据支撑。 |
| 中文关键词:预应力检测 锚索 锚下预应力 运维期 反拉法 |
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| Research on Prestress Detection Equipment for In-Service Anchors and its Application |
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| Abstract:The existing anchor cable prestress detection equipments can only be used when the length of the exposed section of the anchor is greater than 70 cm. Most of these devices weigh more than 150 kg, which is heavy for the detection of anchor in high and steep slopes. Those devices are only suitable for completion inspection, but not for the pre-stress detection of in-service anchors. In order to overcome the above problems, a new anchor cable prestress detection equipment HRAD-300 was developed. It can be applied to the prestressed detection of in-service anchor with exposed length of 7cm. The displacement range of the detector is 200 mm, and the measurement error is less than 0.01 mm. The force range is 300 kN, and the measurement error is ± 1 % FS. The weight of a single box of the equipment is less than 15 kg, and the total weight is less than 40 kg. Based on the principle of reverse pull method and the shape of detection curve, the prestress algorithm was proposed, and the software is programmed. The indoor test shows that there are no obvious mutation points in the detection curve. The calculated values were basically consistent with the locking value. The equipment was used to detect the anchor of the unstable slope of Fenghuang rock. The field anchor detection curves had obvious mutation points and steep drops. The anchor cable runs well and continues to work. The different steel strands of the same anchor cable were unevenly stressed. HRAD-300 is intelligent and light, which can provide data for the health evaluation of anchorage engineering. |
| keywords:Prestress detection anchor prestressing operation and maintenance period Anti-pulling. |
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