著者

篠原 廉 権藤 智之 蟹澤 宏剛 林 盛 保坂 至

出版者

日本建築学会

雑誌

日本建築学会計画系論文集 (ISSN:13404210)

巻号頁・発行日

vol.85, no.773, pp.1525-1534, 2020 (Released:2020-07-30)

参考文献数

15

被引用文献数

1

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In recent times, the design of three-dimensional (3D) complex shape architectures has become much easier since the advent of 3D-CAD or BIM software. However, the roles of designers, contractors or sub-contractors have become uncertain. For example, in the construction of an architectural project, it is necessary for the associated sub-contractors to possess the prerequisite knowledge of the design processes to avoid discordance of roles or prevent irrelevant design alterations. Additionally, in the application of 3D modeling for designs, the method of transferring design information from designers to contractors is difficult. This research elucidates the construction process of formworks of different 3D complex shape reinforced concrete RC architectures. In particular, this research focused on transferring design information from designers to contractors or sub-contractors. Further, the research analyzed the different options involved in the transfer and clarifies the advantages or disadvantages of each option. The results are outlined below. First, from the investigation of two architectural magazines, “Shinkenchiku” and “Kenchiku–Gijutsu” from January 2000 to July 2019, the authors collected 265 3D complex shape RC architectures and clarified their trends. From these architectures, the authors selected four 3D complex shape RC architectures recently constructed for case studies, each of which had different production system. Second, in the case studies, the authors interviewed the designers, the contractors, and the sub-contractors of the four projects and collected the plans or 3D models. From the data collected, the projects were classified according to the viewpoint of who took the initiative for deciding the construction details or information: the designer (project A), the contractor (project B), the sub-contractor (project C), or the contractor and the sub-contractor (project D). The problems associated with each project are outlined below. 1) Project A: There were no major design alterations or occurrence of discordance because the project designers adhered to the given coordinate values with high precision. However, the task assigned to the designer was too large compared with general cases such as making detailed 3D models. 2) Project B: The BIM manager of the contractors developed the BIM model and pioneered the consensus with the owners and designers. However, the sub-contractors were unable to directly apply the BIM model; therefore, the sub-contractors had to develop their own 3D model for the formwork. 3) Project C: The sub-contractors managed the 3D model unitarily, and design alterations made were reflected on the model quickly; this enabled the NC data for production of the formwork to be directly made from the 3D model. 4) Project D: The contractor and the sub-contractor examined the details of the design or construction method together. They joined design processes and shared the 3D model. Thus, no major design alterations or other problems occurred. Under recent circumstances, deciding who should develop 3D models or other necessary information for construction is difficult because the requisite skills or experiences are dependent on the companies involved. However, noticeable trials were present in project C; the sub-contractor managed the information and realized the smooth transfer of information. As a result, this research clarified the gray areas in the production process: how to transfer information, such as coordinate values; two-dimensional (2D) drawings; surface models; solid models; software, information sharing system, when the aforementioned information is decided, and whether construction drawings are directly made from 3D models.

著者

保坂 至 林 盛 権藤 智之 蟹澤 宏剛 山﨑 康造

出版者

一般社団法人 日本建築学会

雑誌

日本建築学会技術報告集 (ISSN:13419463)

巻号頁・発行日

vol.28, no.68, pp.448-453, 2022-02-20 (Released:2022-02-20)

参考文献数

7

被引用文献数

1

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This paper reveals the detail of the construction management of the formwork of a recent complex shape building construction, Kawaguchi-shi Meguri-no Mori. In this project, the 3D-model manager (3DMr) managed the complex 3D-model of the building and revised it following many changes from the designer or the form factory. In addition, the 3DMr planned the schedule of the approval by the designer for each parts of the building, for the form factory could start the fabrication of the form on time. The management system can be effective for complex shape buildings which require more information sharing and time management.

著者

前川 剛範 蟹澤 宏剛 志手 一哉 西 夏実

出版者

日本建築学会

雑誌

日本建築学会計画系論文集 (ISSN:13404210)

巻号頁・発行日

vol.83, no.752, pp.1981-1987, 2018 (Released:2018-10-30)

参考文献数

18

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In recent years, the Japanese government is paying attention to utilizing foreign workers. As a measure for this, the utilization of persons who completed practical training in the Technical Intern Training Program (TITP) in the construction industry and expansion the period and number of recipients of the TITP. These are clearly securing the labor force. However, the acceptance policy is currently "skill training”. In this paper, field survey on building production system in Singapore implemented three times from FY 2014 to FY 2016 summarized the introduction process and actual circumstances of various systems related to foreign workers in Singapore. Also, by organizing the its framework, we will grasp actual conditions and issues. I believe that this paper can contribute as reference material when considering the foreign worker acceptance system in Japan. Foreign workers working in Singapore have changed from Malaysia and China, through Thailand and India to Bangladesh and Myanmar. Naturally, if own country becomes rich, you do not have to go abroad to work. Therefore, there is no compensation for Singapore to keep foreign workers for everlasting. From this influence, it is thought that emphasis is placed on policies for restraining foreign workers and productivity improvement in recent years. In recent years, attention has been focused on utilization of foreign workers. From this situation, it will become a future issue for Japan that build an international strategy to win the competition for securing human resources with neighboring foreign countries. The following is a summary of a part of Singapore's policies and institutions considered to be helpful. ·About dual policy with productivity improvement As a countermeasure against the labor shortage of their citizens, system design that integrates foreign workers' utilization measures and productivity improvement will be helpful. In particular, measures to alleviate the stay conditions of workers who acquired skills can be evaluated as measures that are beneficial to both workers and employers. ·About the system for skill improvement It is characterized by the establishment of a skill development system within the wage system guaranteed by the government. For example, it is a practical exam before entering the country which is a condition of WP, promotion to MYE or R1, etc. Since many of the foreign workers in the construction industry belong to subcontractor companies enterprises of a small-scale, it can interpret that the social development framework and the support of the former contractor business are operated in the system.

著者

蟹澤 宏剛 安藤 正雄 浦江 真人 北條 精志

出版者

一般社団法人日本建築学会

雑誌

学術講演梗概集. F-1, 都市計画, 建築経済・住宅問題 (ISSN:13414534)

巻号頁・発行日

vol.1995, pp.1041-1042, 1995-07-20

著者

小松 智之 蟹澤 宏剛

出版者

一般社団法人 日本建築学会

雑誌

日本建築学会技術報告集 (ISSN:13419463)

巻号頁・発行日

vol.26, no.63, pp.725-728, 2020-06-20 (Released:2020-06-20)

参考文献数

17

被引用文献数

1

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The construction industry is a unique industry which the labor supply and demand rate of change is inevitable. Also the construction industry’s labor intensive is very depends on human power, so the labor supply and demand in accordance with a busy period and a slack period must be adjusted. This paper aims to organize the mechanism of construction workforce supply and demand, and make the problem manifest. Based on the literature survey, we will organize the mechanism of labor supply and demand. Then, the unknown points that emerged and current facts were clarified through a hearing survey to construction companies.

著者

蟹澤 宏剛 藤澤 好一

出版者

日本建築学会

雑誌

学術講演梗概集. 計画系 (ISSN:13414534)

巻号頁・発行日

no.1, pp.977-978, 2002-06

著者

志手 一哉 湯浅 洋一 蟹澤 宏剛 山本 翔太

出版者

日本建築学会

雑誌

日本建築学会技術報告集 (ISSN:13419463)

巻号頁・発行日

vol.15, no.30, pp.557-562, 2009-06-20 (Released:2009-06-19)

参考文献数

9

被引用文献数

2 1

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The interior finish work of apartment building does not progress on schedule in Japan though the apartment construction does. Japanese general constructors have challenged to this issue since the 1970s, but there is no example established as a standard method for interior finish work management.We investigated the process of the interior finish work and analyzed the obtained data, which revealed that the problems were in the relation of product structure, scheduling and work assignment.