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Construction monitoring of lock head base plate using distributed optical fibre sensing technique 被引量:1
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作者 宋占璞 施斌 +3 位作者 朱鸿鹄 沈梦芬 张丹 孙义杰 《Journal of Southeast University(English Edition)》 EI CAS 2015年第4期535-540,共6页
The concrete hydration heat release process of the base plate is monitored using Roman optical time domain reflectometry(ROTDR) sensing sensors. The monitoring data shows that the internal maximum temperature of the... The concrete hydration heat release process of the base plate is monitored using Roman optical time domain reflectometry(ROTDR) sensing sensors. The monitoring data shows that the internal maximum temperature of the base plate is about 54 ℃ after the concrete was cured for 120 h. The fiber Bragg grating (FBG) temperature sensors are adopted to measure the surface temperature of the concrete and the temperature results are used to compensate the data measured by the pulse-prepump Brillouin optical time-domain analyzer (PPP-BOTDA) to obtain the real concrete surface strain of the base plate. The monitoring data is analyzed to obtain a clear understanding of the strain state of the base plate under the effect of concrete hydration heat release. The monitoring results demonstrate the potential of distributed optical fibre sensing techniques as a powerful tool in real-time construction monitoring, and also provide an important insight into the design, construction and maintenance of large hydraulic structures. 展开更多
关键词 construction monitoring lock head base plate optical fibre sensing lock engineering CONCRETE
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Special Marking of 3D Networks' Points for the Monitoring of Modern Constructions
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作者 Evangelia Lambrou George Pantazis Konstantinos Nikolitsas 《Journal of Civil Engineering and Architecture》 2011年第7期643-649,共7页
In order to monitor the deformations of modern constructions a local 3D network was usually being established at the surrounding area. The centering error, of both the instrument and targets, causes significant uncert... In order to monitor the deformations of modern constructions a local 3D network was usually being established at the surrounding area. The centering error, of both the instrument and targets, causes significant uncertainties in the determination of the x, y, z coordinates of the network's points. In order to assure precise centering for both the instrument and targets, not only for the accessible but also for the inaccessible network's points, a prototype way of marking is being implied. A special semi-permanent portable metallic stand (Photo 1) was manufactured for marking the accessible points. The stand provides forced instrument centering of the order of_+0, lmm. It is light enough to carry, it accelerates and facilitates the centering and leveling of the instrument as well as it eliminates the time needed for the measurements. The applied laboratory checks in order to certify the suitability of its use and the provided accuracy are being described. For the inaccessible points special targets were used. The targets were put in permanent attachments (Photos 7-8), which were also manufactured. Useful conclusions were drawn when these special accessories were used in to a 3D network, which was established for the monitoring of a new football stadium. Two measurement phases were carried out. The first one is with the stadium empty and the second one is when it was crowded (about 32000 people) during a significant football match. 展开更多
关键词 Precise centering point marking geodetic control networks monitoring modern constructions.
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Process Monitoring and Terminal Verification of Cable-Stayed Bridges with Corrugated Steel Webs under Contruction
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作者 Kexin Zhang Xinyuan Shen +1 位作者 Longsheng Bao He Liu 《Structural Durability & Health Monitoring》 EI 2023年第2期131-158,共28页
In this paper,the construction process of a cable-stayed bridge with corrugated steel webs was monitored.Moreover,the end performance of the bridge was verified by load test.Owing to the consideration of the bridge st... In this paper,the construction process of a cable-stayed bridge with corrugated steel webs was monitored.Moreover,the end performance of the bridge was verified by load test.Owing to the consideration of the bridge structure safety,it is necessary to monitor the main girder deflection,stress,construction error and safety state during construction.Furthermore,to verify whether the bridge can meet the design requirements,the static and dynamic load tests are carried out after the completion of the bridge.The results of construction monitoring show that the stress state of the structure during construction is basically consistent with the theoretical calculation and design requirements,and both meet the design and specification requirements.The final measured stress state of the structure is within the allowable range of the cable-stayed bridge,and the stress state of the structure is normal and meets the specification requirements.The results of load tests show that the measured deflection values of the mid-span section of the main girder are less than the theoretical calculation values.The maximum deflection of the girder is−20.90 mm,which is less than−22.00 mm of the theoretical value,indicating that the girder has sufficient structural stiffness.The maximum impact coefficient under dynamic load test is 1.08,which is greater than 1.05 of theoretical value,indicating that the impact effect of heavy-duty truck on this type of bridge is larger.This study can provide important reference value for construction and maintenance of similar corrugated steel web cable-stayed bridges. 展开更多
关键词 Cable-stayed bridge corrugated steel web construction monitoring static load test dynamic load test
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Acoustic emission monitoring of rockbursts during TBM-excavated headrace tunneling at Jinping Ⅱ hydropower station 被引量:7
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作者 Wuwei Cheng Wenyou Wang +1 位作者 Shiqiang Huang Peng Ma 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2013年第6期486-494,共9页
To better understand the mechanical properties of marble at Jinping II hydropower station, this paper examines the changes of brittle rocks in excavation damaged zones(EDZs) before and after excavation of tunnel with ... To better understand the mechanical properties of marble at Jinping II hydropower station, this paper examines the changes of brittle rocks in excavation damaged zones(EDZs) before and after excavation of tunnel with the tunnel boring machine(TBM). The paper attempts to employ the acoustic emission(AE) to study the AE characteristics and distribution of rockburst before and after TBM-excavated tunnel. It is known that the headrace tunnel #2, excavated by the drill-and-blast(D&B) method, is ahead of the headrace tunnel #3 that is excavated by TBM method. The experimental sub-tunnel #2–1, about 2000 m in depth and 13 m in diameter, between the two tunnels is scheduled. In the experimental sub-tunnel #2–1, a large number of experimental boreholes are arranged, and AE sensors are installed within 10 m apart from the wall of the headrace tunnel #3. By tracking the microseismic signals in rocks, the location, frequency, quantity, scope and intensity of the microseismic signals are basically identifed. It is observed that the AE signals mainly occur within 5 m around the rock wall, basically lasting for one day before tunnel excavation and a week after excavation. Monitoring results indicate that the rockburst signals are closely related to rock stress adjustment. The rock structure has a rapid self-adjustment capacity before and after a certain period of time during tunneling. The variations of rock stresses would last for a long time before reaching a fnal steady state. Based on this, the site-specifc support parameters for the deep tunnels can be accordingly optimized. 展开更多
关键词 Acoustic emission(AE) monitoring Tunnel construction Microseismic event Relaxation time Rockbursts
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Application of Gliding Scaffold System In Cable-Stayed Bridge Construction
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作者 YUBao-chu ZHANGZhe ChangFu-ping 《Journal of China University of Mining and Technology》 EI 2005年第2期152-156,共5页
Gonghe bridge is a double level cable-stayed concrete bridge with a single-cable-plane of single cable tower. Its span is 114+120 m and a whole length of 236 m. The gliding scaffold equipment is used for the first tim... Gonghe bridge is a double level cable-stayed concrete bridge with a single-cable-plane of single cable tower. Its span is 114+120 m and a whole length of 236 m. The gliding scaffold equipment is used for the first time in the long span cable-stayed bridge construction to reduce the construction time limit. In the process of construction, to make sure a safe connection among concrete objects with different ages, the single-supporting and single-suspension system is adopted before the concrete pouring. While the double-supporting and single-suspension system is applied after con- crete pouring. These construction systems with gliding scaffold equipment are first introduced in long span ca- ble-stayed bridge and presented in detail[1]. The practice shows that these gliding scaffold systems have many advan- tages over the traditional ones. 展开更多
关键词 cable-stayed bridge gliding scaffolding equipment construction monitor and control
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Rapid excavation with a newly developed retaining system: Spiral assembly steel structure
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作者 关成立 杨宇友 王成彪 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第7期2719-2729,共11页
The spiral assembly steel structure, a newly developed retaining wall for the rapid excavation of small-sized foundation pits in unsaturated soil, is presented. This new type of retaining structure is prefabricated in... The spiral assembly steel structure, a newly developed retaining wall for the rapid excavation of small-sized foundation pits in unsaturated soil, is presented. This new type of retaining structure is prefabricated in the factory and is assembled on site in the excavation of a pit. This retaining structure is composed of several prefabricated steel structural units, in which the adjacent steel structural units are joined with connectors. Each steel structural unit has one steel pipe in the radial direction and is welded to a single piece of steel plate. After full installation in situ, the retaining structure becomes a cylindrical steel structure. With the protection afforded by this new type of retaining structure, excavation work can be completed within 24 h to a depth up to 5 m. In order to verify the reliability and effectiveness of this new retaining structure, field construction tests were conducted in Beijing, China. The test construction was monitored. The monitoring program included measuring stress in the structure, lateral earth pressure, and lateral deformation of the surrounding soil. The monitoring data from the field test were compared with the theoretical results. The results show that the proposed new structure is reliable and effective. 展开更多
关键词 working shaft rapid excavation retaining structure field construction monitoring
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CM节点控制在船舶上的应用
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作者 杨昌逢 《机械工业标准化与质量》 2022年第6期46-49,共4页
在船舶的生命周期里,船的整体质量可以通过较好的详细设计,有效地改进建造工艺来获得提高。在结构方面,结构单元及其连接的性能取决于对质量的控制,包括详细设计的质量和建造的质量。详细设计、施工方法、质量控制程度对结构的疲劳性能... 在船舶的生命周期里,船的整体质量可以通过较好的详细设计,有效地改进建造工艺来获得提高。在结构方面,结构单元及其连接的性能取决于对质量的控制,包括详细设计的质量和建造的质量。详细设计、施工方法、质量控制程度对结构的疲劳性能有很显著的影响,尤其是在被认为“关键”的位置。因此,在这些关键位置进行结构建造监控很有必要。 展开更多
关键词 船舶 船舶质量 疲劳 CM(construction monitoring)节点
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A survey on indoor 3D modeling and applications via RGB-D devices 被引量:3
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作者 Zhilu YUAN You LI +3 位作者 Shengjun TANG Ming LI Renzhong GUO Weixi WANG 《Frontiers of Information Technology & Electronic Engineering》 SCIE EI CSCD 2021年第6期815-826,共12页
With the fast development of consumer-level RGB-D cameras, real-world indoor three-dimensional(3 D) scene modeling and robotic applications are gaining more attention. However, indoor 3 D scene modeling is still chall... With the fast development of consumer-level RGB-D cameras, real-world indoor three-dimensional(3 D) scene modeling and robotic applications are gaining more attention. However, indoor 3 D scene modeling is still challenging because the structure of interior objects may be complex and the RGB-D data acquired by consumer-level sensors may have poor quality. There is a lot of research in this area. In this survey, we provide an overview of recent advances in indoor scene modeling methods, public indoor datasets and libraries which can facilitate experiments and evaluations, and some typical applications using RGB-D devices including indoor localization and emergency evacuation. 展开更多
关键词 3D indoor mapping RGB-D Indoor localization construction monitoring Emergency evacuation
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