2014 tunnel construction and tool application technology seminar was successfully held

The 21st century is an era of great development of tunnels and underground space. As the world's largest tunnel construction market, TBM/shield construction technology has received more and more applications and related enterprises. Shandong Tiangong Geotechnical Engineering Equipment Co., Ltd., as the vice chairman unit of the National Brazing Steel Drilling Association, the governing unit of the China Construction Machinery Association Drilling Machinery Branch, and the member unit of the Beijing Equipment Association Shield Machine Special Committee, how to control the construction cost in the shield cutter The research on the optimal configuration of the construction and the problems in the construction process, the improvement of the TBM/shield construction technology and the construction management level have made a good practical development. The shield cutter independently developed by Shandong Tiangong Geotechnical Engineering Equipment Co., Ltd. has been successfully applied to the construction of subways and tunnels in large and medium-sized cities in China. At the same time, the first industry standard of the shield cutter industry drafted by Shandong Tiangong Construction machine cutting tool "JB/T 11861-2014" will also start operation on October 1, 2014. The 4th "2014 Tunnel (TBM/Shield) Construction and Tool Application Technology Seminar" was jointly organized by Shandong Tiangong Geotechnical Engineering Equipment Co., Ltd., the School of Mechanical and Electrical Engineering of Central South University and the School of Civil Engineering of Tongji University on August 30, 2014. Held in Shenyang.
Industry gathering, walk into the tunnel (TBM / shield) construction and tool application technology seminar

The seminar was jointly sponsored by Shandong Tiangong Geotechnical Engineering Equipment Co., Ltd., Central South University, Tongji University, China Civil Engineering Association Tunnel and Underground Engineering Branch Risk Management Committee. Wending Media's "Bridge and Tunnel" provides media coverage. stand by. China Construction Engineering Corporation, China Communications Corporation, China Hydropower Construction Co., Ltd., China Railway Group Co., Ltd., China Railway Construction Co., Ltd., TBM/shield equipment manufacturer, well-known experts and scholars in the TBM/shield industry Second meeting. Taking this opportunity to focus on the tunnel construction market prospects, improve the work efficiency of TBM/shield construction, accelerate the construction of China's rail transit, underground space and tunnel projects, and achieve a win-win situation for equipment companies, construction units and owners.

The seminar was successfully held in Shenyang Country Garden Maritim Hotel Co., Ltd. The seminar invited experts and professors with rich experience in the domestic TBM/shield industry to conduct special reports, conduct academic, technical seminars and exchange of experience for the construction unit. Provided a communication platform with industry experts to discuss how to optimize TBM/shield construction technology, improve tool use efficiency, exchange and study, and gather hundreds of wisdom to jointly promote the development of China's tunnel industry.

Hundreds of wisdom, explore the development and innovation of tunnel (TBM/shield) construction and tool application technology

Experts attending this seminar: Zhang Zitai, deputy general manager of MTR Rail Transit (Shenzhen) Co., Ltd., Zhang Houmei, chief engineer of Guangzhou Shield Construction Underground Engineering Technology Co., Ltd., Professor Xu Mingxin, Shijiazhuang Railway University, Shenzhen Tianao Shield Engineering Technology Co., Ltd. Zheng Zhiqiang, deputy general manager of the former Wanjiazhai Yellow River Diversion Project Management Bureau, Professor Xue Yadong, School of Civil Engineering, Tongji University, Zhang Xueqiang, vice president of Shandong Tiangong Geotechnical Engineering Equipment Co., Ltd., and LXB water diversion project of China Hydropower Bureau Wu Gensheng, Chief Engineer, Professor Xia Yimin, Ph.D. Supervisor, School of Mechanical and Electrical Engineering, Central South University. The participating experts shared major engineering projects and advanced technologies in their research fields, and all parties received the most cutting-edge information through this meeting.

In response to the problems in the TBM/shield application that everyone cares about, Professor Xu Mingxin from Shijiazhuang Railway University pointed out in the "TMB Hob Failure Form and Cause Analysis" that "the disc hob is a special TRM cracker and the key to the TBM cutter." Parts and consumable parts. Hob failure has a significant impact on the cost, speed and efficiency of TBM construction. According to statistics, the cost of tools can account for 1/3 of the cost of tunneling construction, and the ratio of tool replacement time to total construction time. Up to 1/3. The failure mode of the hob is divided into normal wear and abnormal wear. The analysis of the cause of tool wear and the level of tool use management are directly related to the construction efficiency and the return of engineering investment.” Shandong Tiangong Geotechnical Engineering Zhang Xueqiang, deputy dean of the Research Institute of Equipment Co., Ltd. pointed out in the "TBM hob basic design and formation adaptability study" that "when the rock strength is high to a certain extent, there is the ability to compete with the cutter ring steel body," the two strong encounters, There must be a wound, the strength of the knife ring has an absolute advantage in quality, but the advantage of the rock in the total is undoubted, the qualitative change caused by the volume change, the knife ring Failure will inevitably occur. Aside from the external factors such as rock joint development, strength, and excavation parameters, the material selection (material properties) and the blanking process (forming method) of the cutter ring itself ), heat treatment process (internal stress), manufacturing accuracy (machining defects), assembly accuracy (interference) and other issues will also have a very large impact on the knife ring collapse, or fracture." The simulation technology of rock process, Professor Xia Yimin, a doctoral supervisor of the School of Mechanical and Electrical Engineering of Central South University, mentioned that “PFC can observe the stress distribution and contact force chain distribution of the cutting process. The maximum stress of the rock mass under the action of the tool is concentrated in a region in front of the tool tip. And as the position of the tool moves, the damage of the tool tip is most obvious. The rock process of the double-knife cutting is simulated, and the dynamic change characteristics of the rock mass are recorded. With the increase of the depth of cut, the number of cracks in the rock mass increases rapidly, and the crack is pulled. More than the number of shear cracks, indicating that the tensile failure of the rock shows a dominant trend."

Zhang Houmei, Chief Engineer of Guangzhou Shield Construction Underground Engineering Technology Co., Ltd. pointed out that "the mechanical analysis and application study of the damage mechanism of TBM/shield cutter hob" pointed out that "the active torque for driving the hob rotation is the cutting force received by the hob breaking rock." When the active torque is less than the rotational resistance torque received by the hob, the eccentric wear occurs; the load applied by the hob is proportional to the penetration degree. When the penetration degree is too large, the hob will be overloaded and the knife will be caused. If the ring or bearing is damaged, the tunneling process should control the penetration of the hob; under the same conditions, the hob load increases linearly with the increase of the tool tip width. As the blade wears, the hob load increases sharply, so the hard rock excavation The wear tool should be replaced in time.” Professor Xue Yadong, Department of Geotechnical Engineering, Tongji University, “Testing the Rock Breaking Process and Mechanism of TBM Hob”, “At present, China is the country with the largest demand for TBM, accounting for 50% of the world. Stages of economic development in the western, southwestern and mountainous areas of China, infrastructure construction such as railway transportation, highway transportation, water conservancy and hydropower, and large-scale water transfer projects have been completed. Face-to-face spread, large-diameter, large-buried, long-distance full-section tunnel projects are increasingly using TBM construction." "In the next decade, the domestic market demand for TBM is huge." An industry source pointed out that "domestic In the future, the demand for roadheaders will reach 250 units.” Regarding tunnel construction problems and measures management, Zheng Tianqiang, an expert from Shenzhen Tianao Shield Engineering Technology Co., Ltd. (formerly Shanxi Wanjiazhai Yellow River Diversion Project Management Bureau) said that “the construction party will follow The contract stipulates the construction geological work of the system, and adds more experienced geological engineers to the TBM construction. Based on the geological data of the tender, the geotechnical engineer and the excavation engineer jointly prepare the TBM excavation construction manual, and select different excavation parameters according to different geological conditions. The construction manual is continuously summarized, improved and standardized; the geological engineer in the construction track and observe the geological conditions of the surrounding rock, and at the same time carry out geological cataloging, surveying and sampling, sampling, etc., and discover the geological condition changes and report the on-site supervision in time, and jointly the current water conservancy according to the contract. The Code for Hydropower Engineering Geological Survey determines the type of surrounding rock."

Ms. Zhang Zitai, an expert from MTR Rail Transit (Shenzhen) Co., Ltd., based on the experience of the Hong Kong subway, proposed the construction prospect of the third phase shield tunnel of Shenzhen Metro. Mr. Wu Gensheng, a tunnel expert, combined rock mass, surrounding rock integrity and joints through multiple charts and data analysis. Various factors such as developmentality and quartz content, in-depth analysis of the use of tools in tunnel construction, and concluded that the adaptability of the tool and surrounding rock conditions is crucial. This is not only a cost issue for construction companies, but also a key research and development project for the technical equipment manufacturing industry. Mr. Zhang Zitai, an expert from MTR Rail Transit (Shenzhen) Co., Ltd., specifically described the scientific management of the use of shield machines, and fully borrowed from Hong Kong. The experience of the subway, especially pointed out the core technology and core components of some shield machines, so that many guests present in the scene have a lot of feelings; Mr. Zhang Houmei, an expert of Guangzhou Shield Construction Underground Engineering Technology Co., Ltd., combined with the current situation of tunnel construction in Guangzhou, through the analysis of TBM and shield cutters Consuming the comparison situation, summarizing the main forms and causes of the hob damage, comprehensively combining multiple formulas to calculate the critical penetration degree of the hob breaking rock, which makes people feel refreshed and benefited a lot.

Perfectly ended, successfully provided tunnel (TBM/shield) construction and tool application technology exchange platform

At the end of the meeting, the guests entered the roundtable discussion session and exchanged discussions on the theme of “Improving the work efficiency of TBM/shield and tool configuration in construction”. The exchanges between the parties ended the conference perfectly.

The 2014 tunnel (TBM/shield) construction and tool application technology seminar was successfully held. During the conference, the parties exchanged directions for the future development of the industry, and proposed solutions to the problems arising during the construction process. The Chinese tunnel industry took this opportunity. New development. The conference was grateful to China Railway, China Hydropower, China Construction Engineering Corporation and other parties for their support. The conference was disseminated through the media to enable more people to pay attention to and understand the conference, and to have a deeper understanding of tunnel construction and tool applications.

Cyromazine is a kind of insect growth regulator with strong selective characteristic. It will cause the structural distortion of larvae and pupa, to inhibit the eclosion of Diptera insects.

Contact and stomach action, good systemic conduction but slow effect.

Cyromazine is a triazine insect growth regulator used as an Insecticide and an acaricide. It is a cyclopropyl derivative of melamine. Cyromazine works by affecting the nervous system of the immature larval stages of certain insects. In Veterinary medicine, cyromazine is used as an ectoparasiticide.

Mode of action Insect growth regulator with contact action, which interferes with moulting and pupation. When used on plants, action is systemic: applied to the leaves, it exhibits a strong translaminar effect; applied to the soil, it is taken up by the roots and translocated acropetally.

Uses Control of dipteran larvae in chicken manure by feeding to the poultry or treating the breeding sites. Also used to control flies on animals. Used as a foliar spray to control leaf miners (Liriomyzaspp.) in vegetables (e.g. celery, tomatoes, lettuce), melons, mushrooms, potatoes and ornamentals, at 75–225 g/ha; also used, at 190–450 g/ha, in drench or drip irrigation.

Cyromazine

Agrochemical Crop Protection Insecticide,White Powder Insecticide Cyromazine,Cyromazine Poison To Kill Flies

Hebei Senton International Trading Co.,Ltd. , https://www.sentonpharm.com