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  • - 不具合事象と加工工程および加工情報の関連性を対象として -
    曽根 巨充, 遠藤 裕太, 志手 一哉
    日本建築学会計画系論文集
    2020年 85 巻 773 号 1535-1545
    発行日: 2020年
    公開日: 2020/07/30
    ジャーナル フリー

     In this research, we targeted the defect of rebar manufacturing at rebar manufacturing factory, and consider how to ensure quality in rebar manufacturing by analyzing the relevance of manufacturing process and manufacturing information. The result of this consideration will be the basic data for realizing the use of ICT and BIM that contribute not only to ensuring quality but also to improving productivity by building a system that can consistently manage digitized manufacturing information.

     At the rebar manufacturing factory, “manufacturing instruction” is created. Manufacturing instruction was created using computer software. There are 16 items of production information described in the “manufacturing instruction” used at the manufacturing factory investigated, 9 items are used only at the manufacturing site, 6 items are common with the construction site, and 1item was used only at the construction site. QR codes are printed on the “manufacturing instruction”, and manufacturing information is automatically set by reading it into a manufacturing machine that supports QR codes.

     The largest number of defects in the rebar manufacturing factory were 33.3% of "manufacturing shape", followed by 27.1% of "number of manufacturing" and "loading". These three items account for 87.5% of all defects. There was a 5.2% error in creating the “manufacturing instruction”. The place where the defect was discovered was that the construction sites shipped from the rebar manufacturing factory accounted for 61.5%.

     The mistake in the “number of manufacturing” in the A line occurred during the precision cutting process. This work was all handled manually by the workers, but all defects could be dealt with before shipping the manufacturing factory. All the rebar cutting machines are compatible with QR code reading, and the worker did not need to set the cutting dimensions and number of cuts. In the bending process, which is the next process of the cutting process, workers themselves input the manufacturing shape and number of manufacturing into the machine. All of the defects of the "manufacturing shape" in the C line occurred during bending. In this line, there is a machine that can read the QR code and performs cutting and bending with one unit, but it can only handle flat bending, and the three-dimensional shape was manually bent by the worker. In the loading yard of the C line, a bundle of rebar with “manufacturing instruction” lined up side by side, and it was confirmed that the driver in charge of carrying into the construction site looked for the manufacturing instructions.

     Depending on the manufacturing machine, by linking with the QR code, the procedure did not depend on confirmation by workers, but all work was not linked with digitized manufacturing information, so it was partially optimized, and defects at the manufacturing site caused by the confirmation by workers. In the future, by clarifying the relationship between the manufacturing information handled in the manufacturing process at the manufacturing site and the production information used at the construction site, and digitizing manufacturing information and studying the possibility of managing it consistently, we think that it will be possible to build a workflow for rebar manufacturing and assembly using ICT which not only to ensures quality but also to improves productivity.

  • 鳥居本 幸代
    印度學佛教學研究
    1983年 32 巻 1 号 156-157
    発行日: 1983/12/25
    公開日: 2010/03/09
    ジャーナル フリー
  • 関 悠一郎, 國上 健悟, 伊原 克将, 村岡 元司, 切川 卓也, 小野田 弘士, 永田 勝也
    環境工学総合シンポジウム講演論文集
    2010年 2010.20 巻 220
    発行日: 2010/06/26
    公開日: 2017/06/19
    会議録・要旨集 認証あり
    A number of accidents are happening in waste disposal facilities. Diversity of waste and advancement of recycling system are considered one of the reasons. Then, we construct and analyze database called ATHDB-all. It contains the accident, the trouble and the Hiyarihatto cases that happened in Japan. To make automatic safety education system by APT (Accident Prevention Training tool) with 3D-VR (Virtual Reality) technology by using the database of individual facilities are our point. We improve the collecting information tool by ICT(information communiation technology) and use this in three individual facilities. In addition, we constructed database in three. Using database, we developed the tool which can make automatically effective safety education program in each facility and used this tool in individual facilities.
  • - 総合建設会社と専門工事会社の事例を題材として -
    曽根 巨充, 田中 大士, 志手 一哉
    日本建築学会計画系論文集
    2018年 83 巻 754 号 2359-2369
    発行日: 2018年
    公開日: 2018/12/30
    ジャーナル フリー
     In this paper, we are targeting on reinforcement works which has serious influence on the quality of the superstructure from among various kinds of construction work, focusing on information necessary for the building process from design to construction. We clarified the issue for utilize information on reinforcing work by Field survey and analysis. As a result of this, we will summarize basic knowledge on new methods of management of production information utilizing ICT.
     We investigated the workflow of the reinforcing bar bending factory, interviewed the rebar sub-contractors and observed the reinforcing work on the construction site; therefore, we grasp of the production information in the reinforcing work in detail. In addition, we investigated where ICT is used in the flow of information. As a result, the following knowledge was obtained.
     1) Production process can be categorized into four types, "drafting", "bar bending", "placing of rebar", "inspection".
     2) Information on the management items "drafting" and "inspection" is obtained from the structure drawing and the construction drawing. Because their information is an element unit.
     3) Management items of "bar bending" and "placing of bar" obtain information from "bending schedule" and "bending instruction tag". Because their information corresponds to materials.
     4) The digital information of the rebar bending process is used to create of "reinforce drawing", "bending schedule", "bending instruction tag", and it is applied to progress management and inspection in the reinforcing bar bending factory. Among them, software that creates "bending instruction tag" is developed by reinforcing bar bending factory himself.
     In addition to hearing within the reinforcing bar bending factory, interviews to a foreman of reinforcement works in the construction site were conducted twice and process analysis was performed. As a result, the following knowledge was obtained.
     1) Inside the reinforcing bar bending factory, workers are himself conduct sampling inspection of bending reinforcing bars. The confirmation items at that time are the information on the dimensions stated in "bending instruction tag".
     2) After bending work at the factory, "bending instruction tag" is used until distribution to work place on site. At the placing of bar used information of "reinforce drawing", and for final inspection "structure drawing" is used.
     3) The sub-contractor of the reinforcing bar performs the self-check during the placing of bar. A general contractor will inspect after the placing of bar is completed.
     We clarified the following contents from the investigation of the actual situation of the whole process of reinforcement works and workflow analysis.
     1) In reinforcement work information for connecting design and construction, the bend and check information is intensive on "bend command tag". The information described in the "structural diagram" is referred to in the creation of "construction drawing", "reinforce drawing" and "bending schedule", but bar bending, transportation, distribution and placing of bar bending Information of instruction tag is used.
     2) Since the information to be referred to changes during the process, it has the risk of mistakes in converting information.
     The workflow of the reinforcement work was partially optimized because the work was divided finely. Therefore, a mechanism for preventing a mistake of work between each work was not constructed. From now on, we think that the division of responsibility and roles in the production process in rebar work progresses more. In order to overcome the situation, it is possible to improve "productivity" by proceeding with "visualization" and "sharing" of information on bending processing and arranging muscle, and by not sending defective products to the subsequent process, and using ICT and BIM are important.
  • 杉町 敏之, 須田 義大, 阿部 朋明, 鈴木 彰一, 牧野 浩志, 鯉渕 正裕, 杉浦 孝明
    生産研究
    2015年 67 巻 2 号 149-151
    発行日: 2015/03/01
    公開日: 2015/03/30
    ジャーナル フリー
    本研究では,道路の劣化に与える影響が大きい過積載トラックの対策のため,重量変化により生じる車両の固有振動数変化に着目し,次世代交通システムで応用可能な重量推定法に関する基礎検討を行う.具体的には,重量ごとに変化する車両の固有振動数に着目し,この値を走行車両上で計測することにより過積載を検出するシステムの実現を目指す.そのための検討として本稿では2 軸車両を対象とし,積載重量に対する固有振動数の変化を解析する.また,個体差や経年変化に対する検討として,重心位置の変化に対する固有振動数への影響に影響について検討を行った.
  • -原子炉容器管台貫通部の残留応力測定-
    中長 啓治, 太田 高裕, 小川 直輝, 麻 寧緒, 濱口 裕充, 佐藤 嶺樹, 名山 理介
    溶接学会論文集
    2007年 25 巻 4 号 581-589
    発行日: 2007年
    公開日: 2007/12/14
    ジャーナル フリー
    This study aims to ensure the safety of the nuclear power plants. The accidents of leak from the welded zones at the pipe penetration part of reactor vessel or at the coolant pipe are reported at home or abroad. One of the main causes is the welding residual stress. So, it is important to know the welding residual stress for the keeping of high safety of the plants, the estimation of plants life cycle and the plan of maintenance. The welded joints of the nuclear power plants have complex shapes, and the welding residual stresses also have complex distributions three-dimensionally. In this study, the inherent strain method combined with Finite Element Method (FEM) is used to measure the welding residual stresses accurately.
    The mock-up is idealized for the welded joint at the pipe penetration part of actual reactor vessel. The inherent strain method is applied to measure the residual stresses. In this method, the inherent strains are unknowns. When the residual stresses are distributed complexly in 3-dimensional stress-state, the number of unknowns becomes very large. So, the inherent strains are expressed with some functions to decrease the number largely. The theory, the experiment process and the analyzed results are explained. The characteristics of the distributions of residual stresses and their production mechanisms are discussed. The inherent strain method gives the most probable values and the deviations of the residual stresses. The deviations are small enough for the most probable values. It assures the high reliability of the estimated results.
  • 田中 一史
    空気調和・衛生工学会大会 学術講演論文集
    2018年 2018.2 巻 B-42
    発行日: 2018年
    公開日: 2019/10/30
    会議録・要旨集 フリー

    さいたま新都心地域冷暖房センターは2000年4月に開業し、合同庁舎、さいたまスーパーアリーナ等の重要施設に熱供給を行ってきた。今回、本地冷区域内に2017年1月に移転新築した某病院において、従来の熱供給に加えて熱供給導管のネットワークや地域冷暖房事業者の要員・ノウハウ等の有効活用を検討した。本報では、地域冷暖房事業者のハードとソフトの両面を活用し、通常時の省エネ性と災害時の病院機能の維持を図るシステムを構築した。

  • 野崎 光夫, 加藤 清一, 柳原 元一
    日本作物学会東北支部会報
    1971年 13 巻 14-15
    発行日: 1971/02/10
    公開日: 2017/12/20
    ジャーナル フリー
  • 平山 育男
    日本建築学会技術報告集
    2010年 16 巻 32 号 377-380
    発行日: 2010/02/20
    公開日: 2010/02/19
    ジャーナル フリー
    The ground plan of Ozashiki, Butuma and Maezashiki covered with tamami of the former Hoshino’s main house was performed by inner legislation system, and the dimension value between the pillar conversed by inter columniation system was written down to the member. Span direction of Tyanoma taken the inter columniation system, on ridge direction, it performed by inner legislation system at entrance southward, but performed by inter columniation system at northward. The other, Genkan and Niwa northward were planed by inter columniation system. Namely, it was recognized that this building planed by inner legislation system together with inter columniation system.
  • -ひずみ計測領域の適性診断-
    小川 直輝, 中長 啓治
    溶接学会論文集
    2010年 28 巻 2 号 208-215
    発行日: 2010年
    公開日: 2010/07/22
    ジャーナル フリー
    The objective of this study is to ensure safety of nuclear reactors. A few accidents of leaks from welded zones at pipe penetration parts of reactor vessel or in coolant pipes have been reported around the world. One of the main causes of such leaks is welding residual stress. It is therefore very important to know the welding residual stress in order to maintain the safety of the plants, estimate plant life cycle and design an effective maintenance plan. Welded joints in nuclear reactors have complex shapes, and the welding residual stresses have complex three-dimensional distributions.
    The inherent strain method is an analytical method that solves an inverse problem using a least squares finite element method. The method gives the most probable value and the deviation of the residual stress, allowing the reliability of the estimated results to be discussed. In this method, the inherent strains are unknowns. When residual stresses have a complex three-dimensional distribution, the number of unknowns becomes very large. The inherent strain distribution is therefore expressed with an appropriate function, significantly decreasing the number of unknowns. In this study, inherent strain theory and method are applied to measure the welding residual stresses for a mock-up of a welded joint at a pipe penetration of reactor vessel.
    In this paper, applicability of strain measurement region is diagnosed. 5 kinds of regions are applied to estimate the residual stress, and accuracy and reliability of analyzed results are judged from 4 points of view, that is, residuals, unbiased estimate of variance of errors, welding mechanics and economy. Most reliable and economical measurement region is selected, which brings most reasonable result.
  • 酢屋 ユリ子, 伊藤 達也, 千田 俊幸, 渡辺 敏, 奥田 舜治
    医科器械学
    1991年 61 巻 suppl 号 102-103
    発行日: 1991/11/20
    公開日: 2021/05/28
    ジャーナル フリー
  • 芹澤 久
    溶接学会誌
    2009年 78 巻 5 号 463-466
    発行日: 2009年
    公開日: 2014/02/12
    ジャーナル フリー
  • 杉町 敏之, 須田 義大, 阿部 朋明, 鈴木 彰一, 牧野 浩志, 鯉渕 正裕, 杉浦 孝明
    交通・物流部門大会講演論文集
    2014年 2014.23 巻 2208
    発行日: 2014/11/28
    公開日: 2017/06/19
    会議録・要旨集 フリー
    Roads make a crucial contribution to economic development and growth and bring important social benefits. Regular road maintenance is economic and social importance. A major cause of road damage is a heavy-duty vehicle. Therefore, weight of vehicle is limited by law. Crackdown on overloaded vehicles is social issues, and perform simulations for weight estimation based on natural frequency. In this study, we focus on natural frequency change of a vehicle caused by change in the weight. Simulation results of natural frequencies are shown as basic study for weight estimation based on natural frequency.
  • 前川 晃, 中長 啓治, 笠原 憲文, 青木 恵介
    年次大会
    2011年 2011 巻 G030034
    発行日: 2011/09/11
    公開日: 2017/06/19
    会議録・要旨集 フリー
    Three-dimensional distribution of weld residual stress in a large-bore and heavy-walled stainless pipe with butt-welded joint was evaluated by inherent strain method with distribution function. The weld joint was made by TIG welding with single-U shape groove and its size is used in the primary coolant system in nuclear power facilities. The residual stress distribution in the circumferential direction as well as in the through-thickness direction of the joint was estimated using the measurement values obtained in the multiple positions. It was clarified that the three-dimensional stress distribution in the weld end was different from that in the other region.
  • -ロバスト推定法(カット付き最小二乗法)の適用-
    中長 啓治, 田中 洋輔, 田村 涼太, 小川 直輝
    溶接学会論文集
    2012年 30 巻 1 号 50-59
    発行日: 2012年
    公開日: 2012/03/16
    ジャーナル フリー
    The objective of this study is to ensure the safety of nuclear reactors. A number of accidents occurred from the welded zones at pipe penetration points of the reactor vessel or in coolant pipes have been reported at sites around the world. One of the main causes of such leaks is welding residual stress. It is therefore very important to know the welding residual stress in order to maintain the safety of the plants, estimate plant life cycle and design an effective maintenance plan. Welded joints in nuclear reactors have complex shapes, and the welding residual stresses have complex three-dimensional distributions.
    In this study, the mock-up is idealized and manufactured for the welded joint at the pipe penetration part of actual reactor vessel. The inherent strain method is applied to measure the welding residual stress of the joint accurately. The inherent strain method is an analytical method which solves an inverse problem using a least squares method.
    For more accurate estimation, the robust estimation is applied to the inherent strain method. As one of the robust estimation methods, the least squares method with cut is used. The data of the measured strains are selected, based on the residuals. First, all data are used in the analysis. Some data which have large residuals are cut, and the next analysis is performed, using the rest of the data. Such calculation is repeated until a convergence condition is satisfied. A concrete procedure of the calculation is proposed. The welding residual stress of the joint is analyzed by such robust estimation method. As a result, high-accurate estimation is achieved. The significance of the result is discussed in detail.
  • 須永 英武, 村井 敏昭
    空気調和・衛生工学会大会 学術講演論文集
    2009年 2009.2 巻 G-35
    発行日: 2009/08/18
    公開日: 2017/08/31
    会議録・要旨集 フリー
    This case study looks at how hotels, faced with dilapidated equipment and escalating fuel expenses, managed to achieve preliminary reduction rates of about 50% (with the buildings as a whole achieving a reduction of roughly 30%) by upgrading their equipment from fuel-consuming types to highly efficient electric-powered ones. This case study also compiles the efforts made within a 1-year period to address the size of energy usage and operating methods, before and after upgrading.
  • 山本 亨, 鈴木 央一, 小島 通雄, 田口 明美
    空気調和・衛生工学会大会 学術講演論文集
    2006年 2006.1 巻 B-4
    発行日: 2006/09/05
    公開日: 2017/08/31
    会議録・要旨集 フリー
    This paper shows the situation of action activity which is energy conservation by using BEMS data effectively. In developed system, a set point of second side air conditioning facility was changed and controlled. Furthermore, a characteristic of energy demand of a building and operating performance characteristic of heat source machinery was analyzed, and optimal operation of heat source system was planned.
  • 沢田 正道, 宮崎 友昭, 竹井 宏, 神村 一幸, 松葉 匡彦, 田口 宣夫, 米谷 誠, 横山 孝仁
    空気調和・衛生工学会大会 学術講演論文集
    2003年 2003.3 巻 D-57
    発行日: 2003/08/20
    公開日: 2017/08/31
    会議録・要旨集 フリー
  • 岡本 滋史, 村上 雅英
    日本建築学会技術報告集
    2010年 16 巻 34 号 945-950
    発行日: 2010/10/20
    公開日: 2010/10/20
    ジャーナル フリー
    In the traditional Japanese architecture, mud wall is used as a major structural element. However, horizontal shearing strength of mud wall is low, and it is difficult to maintain the length required of the shearing wall in the direction toward the frontage of the building. In this paper, a type of mud wall with high shearing performance characteristics has been developed through reinforcement by embedding bracings in mud wall. Shearing property of the mud wall embedded with bracings was confirmed by experiment. Also, the resistant mechanism against shear force in this wall was clearly defined by the element test.
  • 岡村 卓麻, 角田 誠
    日本建築学会技術報告集
    2007年 13 巻 26 号 695-698
    発行日: 2007/12/20
    公開日: 2008/08/01
    ジャーナル フリー
    Volume and variety of construction waste according to demolition were affected by both construction and demolition method. In the present circumstance, demolition processes were not considered building construction method at all. In this study, we grasped the influence of rationalization in construction method, which is prefabricated detached house, on demolition process. As a result, demolition of composite materials made in factory were required a great deal of time for separation. The necessity of mutual relationship contents of disposal and labor of separation were found out.
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