Castle towns in the modern era had unique urban fabric composed of well-developed infrastructures, such as streets, waterways, and drainage. These elements have long interested researchers in the fields of urban history, architectural history, and others. However, the principles of the design of the castle town have not been fully understood. Therefore, there has been a growing request to perform research on it in the field of history of civil engineering from the viewpoint of the infrastructure alignment of streets, waterways, drainage, and others.

 The purpose of this study was to understand the design principles of Nishimi district in the castle town of Iwakuni. In this study, using the methodology, shown in the authors’ previous research, of the quantitative analysis to understand the design principles by using modern surveying maps, the design principles of Nishimi district have been explained. Furthermore, the authors’ methodology has been improved through the analysis in this study, and it has been clarified that the improved methodology would be useful to understand the design principles in the castle towns.

 Double diagonal truss bridges in the Korean Peninsula during the end of World War II were newly developed as an air raid (bombing) resistant structural type by Railway Bureau of the Government-General of Chosen, Japan. The development and the construction were summarized based on memoirs by engineers of Railway Bureau and technical magazines before 1940, including the newly discovered original drawings. To improve the air raid resistant performance, diversity (combination) of different technologies such as internal and external statically-indeterminant, suspension structure and etc. was strongly recommended. Finally the process of design and construction of Yalu river bridge between China and North Korea and its air raid resistant performance were described.

 The construction of the Hario Radio Tower commenced in 1918 and was completed in 1922 by the former Imperial Japanese Navy, which came to recognize the importance of radio communications during the Russo-Japanese War. While the deterioration of concrete structures has recently become a serious social problem, this radio tower, which was constructed approximately 100 years ago, maintains its integrity without cracks or rebar corrosion. However, except for a few extant photographs depicting the construction’s progress, we have no clear picture of the construction methods used. Nevertheless, it is necessary to pass on to future generations the construction techniques used to build this precious heritage. From an analysis of these photographs, phenomena remaining on the concrete surface, and documents of the period, it became clear that the tower was built while moving the external suspended scaffolding vertically; the concrete was compacted using the pounding “tsukikatame” method that employs medium-consistency concrete. Furthermore, the study verified that this pounding method produces dense concrete and is effective for suppressing carbonation.

 This research examined the entries related to bridges listed in Tokugawa Jikki among those that touched on the government regulations regarded roads that were issued by the Edo Shogunate in Japan. A total of 6 items were obtained from categorizing the 188 entries mentioned in the document according to the policies implemented by the Edo Shogunate. The category of “legal regulations” was the largest, at 116 items, and touched on such topics as the “duties” of building and repairing bridges, as well as “maintaining and managing” them by patrolling. regularly to detect any defects. This was followed by the 68 items that touched on “replacement and repairs,” followed by “building of new bridges,” which had about 40% the number, at 28 items. This information shows that focus was given to maintenance and management of bridges during the early and middle Edo period, and that their new construction was controlled.

 In the reconstruction project after the Great Kanto Earthquake, a land readjustment, which was a tool to develop district, realized small urban parks. This study aims to elucidate the process and the background of planning them from the idea until the notice, from the viewpoint of the relation to the land readjustment.

 Though the Board of Reconstruction had mentioned small urban parks from the early stage, creating them by a land readjustment had not been discussed because the Board had limited the land readjustment area to areas along streets. However, the Board expanded it to whole burned area for a cost-reduction after Shingi-kai which was a conference required the Board to downscale the reconstruction plan. This change meant that land readjustment became the means to develop district, not just to gain land for roads, and due to this change the project of small urban parks could be realized by a land readjustment.

 There are less studies on replotting plan of land readjustment than those of block design in city planning research, The author understand that it is very practical matter, administrative disposition with personal property and relative to interpreted land readjustment act.

 The aim of this study is to solve the historical change of relation of replotting design methods to settlement money of replot, which constitute replotting plan. An approach in this paper is to follow change of law system and practical planning methods through change of block design in 100 years by research of literature about land readjustment projects and law system. The change of block design is from layout plan for detached houses to large scale blocks for distribution facilities. Therefore it is necessary of looser design level to achieve replotting plan which is to adopt offering replotting design. The change gave methods of replotting design and calculation of the settlement money. It means a historical process to convergent a proportional system of replotting design and settlement money with development benefit from some area systems without total land price increase.

 For the wooden compartment burial under the ground in the middle Yellow River basin under less rainfall and semi-dry climate, some kinds of soil water control were performed such as surrounding the compartment by charcoal and impervious clay. This burial style spread to the middle-lower Chang River basin and the Korean Peninsula. Burial in the mounds in the lower Chang River basin, Tudunmu in Chinese, in order to avoid soil water under humid climate, changed to burial mounds with burial jars in the Northern Kyushu. After that, this developed to burial mounds with stone chamber (tumulus or Kofun in Japanese). Some kinds of soil water control in these tumuli can be found with times.

 Kerns started in the Northeastern region of China are burials in filled gravel stones, and developed to large sized kerns with stone chamber. In the Northern Kyushu, kerns constructed using coast gravels in the Tumulus era are very simple burial compared with tumuli. And any special soil water control can’t be found. Concerning dolmens, except of dolmens with burial jar in the Northern Kyushu, there is no soil water control. Burial jars can be considered as one of the soil water control by Yayoi ancient people.

 We can find the fine contrives of facilities managements in the historical agricultural water usage system which was built before early period of Meiji and is used present-now. One reason for this is that the manager using water usage system on a daily basis led construction of a water usage system, recognizing problems in using it. It is an important viewpoint that we evaluate those technical contrives and we try to introduce these contrives to a modern civil engineering technique. In this study, we clarified a technical device for the facilities management in TUJYUN-YOUSUI from a field work, documents investigation, and hearing investigation. In TUJYUN-YOUSUI, there are twelve DOROZENNUKI that is aimed for managing depositing earth and sand in a waterway. In a DOROZENNUKI water velocity is half as usual canal line, so reducing velocity makes enlarging deposit of earth and sand. In canal tunnels that is difficult to remove depositing earth and sand, cross-sectional area is small comparing open channel section, so this contrive reduce depositing earth and san d in canal tunnels section. In consequence of this, without removing earth and sand in canal tunnel, usage function of TUJYUN-YOUSUI is hold since construction. Also, water flush at TUJYUN-KYOU were performed to remove earth and sand from syphon tube in TUJYUN-KYOU. In addition to the earth and sand management, safety management is considered in TUJYUN-YOUSUI. The much outlet works was installed in the waterway section for the safety of the facilities, these was considered to evacuate damage with flood discharge. We can find design idea and technical contrive that a designer makes for TUJYUN-YOUSUI to maintain water usage function. So these design idea and technical contrive give us the suggestion to a current technique.

 This paper focuses on the port-building work, where a plan was made in Taiwan during the Japanese rule, and the actual work was carried out. The purpose of this research is to clarify the features of the plan and the fact that the construction was the first construction case in prewar Taiwan and even in Japan.

 Niitaka Port, which is the subject of analysis in this paper, is a port located in the western part of Taiwan, and it was expected that it will serve as an industrial port as well as a commercial port at the end of the Japanese colonial era, and a construction plan was made. It was also the first port in Taiwan where a construction plan for the purpose of constructing an industrial port was formulated from the beginning and the construction was carried out.

 With regard to the above points, this paper clarified the technical characteristics of the port construction work and details of the functional development as an industrial port by analyzing the construction plan at that time. Then, the historical significance of the port construction project and its impact after the war were clarified.

 This study aims to clarify the thought and the characteristics of bridge design developed by Osaka Municipal Electric Railway Project in Osaka City before World War II. The results are as follows; 1) There might be some ideas to unify the structural type and the construction cost of bridges for each railway route. 2) There are three main characteristics of bridge design from perspectives of architectural design and urban design; one is the unification of structural type and handrail design in bridges on the same route, another is the variety of handrail design in bridges on the specific route, and the other is the limited adoption of arch bridges, which were considered in the geological conditions and the importance of locations where bridges were built.