China Engineering Consultants INC

Taipei, Taiwan

China Engineering Consultants INC

Taipei, Taiwan

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Weng M.-C.,National University of Kaohsiung | Wu M.-H.,National University of Kaohsiung | Ning S.-K.,National University of Kaohsiung | Jou Y.-W.,China Engineering Consultants Inc.
Engineering Geology | Year: 2011

This study evaluates triggering and causative factors of landslides by comparing their occurrence in the Lawnon River Basin prior to and after rainfall and earthquake events over a five-year period (2005-2009). The landslide ratio in the study area was low (less than 4%) before 2007, and significantly increased in the wake of Typhoon Morakot in 2009. The high accumulation of rainfall was the major triggering factor. In addition, the major seismic activity of March 4, 2008 also contributed to landslide occurrence. The combined influence of rainfall and the earthquake is evaluated based on multi-variable regression analysis. Though no significant co-seismic landslides were found after the March 4, 2008 earthquake, its influence on slope stability has been observed from the apparent growth of landslide ratio in the four rainfall events following the quake. Causative factors include the higher landslide ratios occurring in sedimentary rock zones (especially sandstone formations with intercalations of shale), and dip slopes, which are demonstrably prone to plane failures. © 2011 Elsevier B.V.


Wang H.,China Engineering Consultants Inc. | Hsieh S.-C.,Nanyang Technological University | Lin C.,National Chung Hsing University | Wang C.-Y.,National Central University
Journal of Performance of Constructed Facilities | Year: 2014

In Taiwan, many bridges span rivers that exhibit severe channel variations in response to drastically increased flows and resulting floods caused by typhoons and storms. Flood-induced scour can undermine the effective embedment depth of bridge foundations. The Shuang-Yuan Bridge, spanning a downstream section of the Kaoping Stream, was severely damaged during Typhoon Morakot in August 2009. A qualitative investigation was conducted to determine the possible causes of this bridge collapse. Relevant hydrologic, meteorologic, structural, geotechnical, and terrain information from various sources both in written and image formats was collected, updated, and reviewed. The disaster investigation included field investigations, nondestructive inspection of bridge remnants, and investigation of structural damage of upstream river crossings, hydrologic changes, damage to training structures/embankment, riverbed profile changes, and debris during the flood event. Several inspections were applied to determine the embedment depths, positions of underwater remnants, and changes in riverbed elevation. The investigation results identified multiple possible causes of failure, including flood flows, river-bend-induced turbulent flows, and the joint effects of extended foundations and rafted wood. © 2014 American Society of Civil Engineers.


Wang J.-J.,National Taiwan University of Science and Technology | Chang T.-P.,National Taiwan University of Science and Technology | Chen B.-T.,National Taiwan University of Science and Technology | Wang H.,China Engineering Consultants Inc.
Journal of Sound and Vibration | Year: 2012

A new and quick approach is proposed to evaluate Poissons ratio of materials with only the measured longitudinal and cross-sectional resonance frequencies from the impact-echo test on a solid circular rod of known dimension. Both the longitudinal and guided wave propagation theories are used to derive the required equations through regression analysis. Procedure to verify the adequate length of solid rod specimen to obtain a valid Poissons ratio is described. Experimental data of four materials, concrete, steel, stainless steel and brass, illustrated with the proposed approach show satisfactory results. © 2011 Elsevier Ltd. All rights reserved.


Patent
China Engineering Consultants Inc. | Date: 2014-07-16

A bridge lifting support bracket is disclosed, which comprises a supporting mechanism, comprising a bracket having a depressed area at a face thereof and a lifting portion disposed at two sides of the bracket, respectively; and at least two jacks, disposed on a bottom face of the lifting portions, respectively. As such, a space for receiving a jack properly is secured by digging out a space of a concrete protection layer of a lower structure and using a supporting mechanism cooperating therewith when only a small space or a closely tight bonding with no seam existing between a bridge and a pier, whereby a lifting process of the bridge may be safely performed.


Patent
China Engineering Consultants Inc. | Date: 2014-04-08

A synchronous control integrated system for bridge lifting, comprising a monitor mechanism; an oil pressure control mechanism, connected to the monitor mechanism; a plurality of jacks, each connected to the oil pressure mechanism, respectively; and a sensor mechanism, connected to the monitor mechanism. As such, a shift variance generated by girders of a bridge may form a signal by using a sensor mechanism and jacks together transmitted on line to a monitor mechanism as a control parameter, so that the monitor mechanism may have an accurate adjustment and monitoring on an oil pressure control mechanism and the jacks, whereby completing the synchronous control operation for the bridge lifting course. Furthermore, the bridge lifting construction may have its improved accuracy and safety.


Patent
China Engineering Consultants Inc. | Date: 2014-04-14

A thin jack device for bridge lifting is disclosed, comprising a base seat; a lifting unit, movably connected with the base seat; and a displacement sensor, disposed at a side of the base seat. In this manner, an arrangement may be applied when a gap altitude between a bridge girder and a pier is insufficient to reduce a risk possibility of violation of the bridge and pier, and a displacement sensors attached to stroke is used to monitor a raised altitude to reduce a mechanical error to promote safety and thereby sufficiently the current pier structure to save a temporarily used pier or a frame based design and construction, whereby increasing the construction safety and decreasing the construction cost.


Patent
China Engineering Consultants Inc. | Date: 2015-06-25

An active fixed block track circuit comprises at least a fixed block section, comprising at least two rails corresponding to each other, each having an isolation connector at two ends thereof and connected to a power supply unit and a traffic signal; a short driving unit, connected to each of the two rails within the fixed block section; and a detection unit, connected to the short driving unit. In this manner, not only the previous rail traffic signal circuit function where no more than one train may be allowed into the same fixed block section is maintained, but also another train approaching from the rear may be prevented from entering the fixed block section when the detection unit at the fixed block section detects an exceptional case happening at a neighboring fixed block section so that the traffic signal unit is switched into a stop traffic signal.


Patent
China Engineering Consultants Inc. | Date: 2014-11-19

A multi-computer vision recognition system for a level crossing obstacle is disclosed, comprising vision image systems, a position determination system, an obstacle determination resolution system and a power unit, where vision image systems which may operate all day long operate simultaneously, information of the single vision image systems is each computed by using the position determination system, and then the computed result is introduced to the obstacle determination resolution system for determination, whereby achieving an increased obstacle recognition result and a promoted obstacle recognition accuracy.


Patent
China Engineering Consultants Inc. | Date: 2014-03-25

A bridge lifting support bracket is disclosed, which comprises a supporting mechanism, comprising a bracket having a depressed area at a face thereof and a raising portion disposed at two sides of the bracket, respectively; and at least two jacks, disposed on a bottom face of the raising portions, respectively. As such, a space for receiving a jack properly is secured by digging out a space of a concrete protection layer of a lower structure and using a supporting mechanism cooperating therewith when only a small space or a closely tight bonding with no seam existing between a bridge and a pier, whereby a raising process of the bridge may be safely performed.


Patent
China Engineering Consultants Inc. | Date: 2014-05-12

A multi-computer vision recognition system for a level crossing obstacle is disclosed, comprising vision image systems, a position determination system, an obstacle determination resolution system and a power unit, where vision image systems which may operate all day long operate simultaneously, information of the single vision image systems is each computed by using the position determination system, and then the computed result is introduced to the obstacle determination resolution system for determination, whereby achieving an increased obstacle recognition result and a promoted obstacle recognition accuracy.

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