This paper is concerned with the labor management system which might be one of the most important part of the construction management system. A desirable construction management system in construction work site is also presented, into which a new concept of work time management is introduced. Taking a worker in-out management system as the first and basic example of the management system, necessity and effectiveness of a labor management system are shown and practical considerations of the system in future are also described.

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Embedded Steel Plate Cell Method were used in the construction of a 1790 meter section of the seawall for the Kansai International Airport Island. The steel cells were driven into soil improved by Sand Compaction Pile Method using synchronized vibration hammers and water jets.
Based on the data obtained during actual driving operations, the mechanism of vibration driving and the effect of water-jetting were studied in relation to the dynamic and hydraulic behavior of the soil in order to determine the optimum combination of vibration hammers and water jets for various all parameters and soil conditions.
The results of this study can be applied to the planning of a variety of cell and pile driving situations.

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The stability of concrete-block work for the protection of the pier against the scour at flood is discussed by the way of the multivariate analysis.
By using the data on the safety blocks and the flow-out blocks at flood-time, the discriminant analysis is executed.
In conseqence, the discriminant function for the stability with the six variables is induced. Their variables are river width-depth ratio, river depth, friction velocity, river channel radius, block weight and construction width of block.
An relation between scour depth around pier and construction width of block, a balanced weight and a balanced construction width are also discussed.
Lastly, the judgement method about the stability on the concrete-block work is proposed with regard to the weight of anti-scour block and its construction width.

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A model for landslide prediction is presented using land cover information obtained from a satellite multi-spectral scanner data and geographical information such as the lay of the land, the nature of the soil and so on. This prediction model is based on the analysis of landslide data using Quantification Method Type I, II and III, The method of prediction is as follows: 1) Quantification Method Type I and III are used to analyze the causality between the satellite multi-spectral scanner data and landslide phenomena. 2) Using the result from Quantification Method Type I and III, a prediction map of a landslide area is made by using Quantification Method Type II and a min-max method applied to distinguish broken from unbroken areas. Comparison of the prediction map with on-site inspection of the areas under investigation, gave good agreement on the prospective landslide areas, measures for the prevention of landslides could then be undertaken. This prediction method is not only useful for selecting areas in danger of landslide but also for prevention of landslide disasters such as in areas where mechanized construction on steep slopes are being made.

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Construction industry is for the long run considered to be stagnant if neglected to challenge for the new further demand of business related to the construction. In order to find the countermeasures for the stagnation, we had performed the questionnaire survey of the managerial awareness of the smaller construction enterprisers in Tokushima prefecture. We were able to grasp and clarify the major issue and the managerial characteristics of the smaller construction enterprisers by the statistical analysis of the data obtained from the survey. The priority order of the countermeasures was decided by the application of the Analytic Hierarchy Process. As the result we could finally suggest the promotion plan of the smaller construction enterprise forward the 21st Century, geared to the characteristics and the priority order.

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The Defense Agency has a large number of airfield concrete pavements that are approaching the ent of their service lives. As a result, the maintenance required to keep these pavements in service is steadily increasing and it is very important to quantify the deterioration of pavement. In this paper, an equation for deterioration evaluation of airfield concrete pavement by surface conditions was developed. The value obtained from the developed equation was called Pavement Deterioration Index (PDI). The accuracy of PDI method was examined by the past data of surface condition survey that carried out when the pavement was rehabilitated and it is shown that PDI method can be used for the deterioration evaluation of airfield concrete pavement.

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Rock tunnelling in urban area where blasting may not be allowed due to vibration or noise is increasing recently. Under these circumstances, rock tunnel is excavated by newly developed non-blasting tunnelling method with slot drilling machine and hydraulic impact breaker. In this paper, the data obtained during actual tunnel excavation by this method is analyzed to find out how to excavate tunnel by this method more effectively. The conclusion of this study is that the cycle time of tunnelling and the reasonable length of slot can be calculated by the rock conditions like uniaxial compressive strength of rock and joints evaluated it's spacing. Once the cycle time of tunnelling can be determined as above mentioned, the most effective construction method, as to the arrangement of tunnelling equipment and the corresponded construction period, can be schemed.

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The stability of rock slopes in discontinuous rock mass associated with the construction of power plants, highways and open-pit mines is always of paramount importance during the lifetime of these structures. As compared with soil slopes, the failure modes of slopes are various and are closely associated with the spatial distributions of discontinuities in relation to slope geometry and their mechanical resistances as well as those of intact rock. Therefore, any design scheme for rock slopes must consider various possible failure modes and evaluate the stability of designed slopes in relation to the above elements. In this paper, the authors first classified various failure modes in relation to the spatial distributions of discontinuities in relation to slope geometry and its mechanical properties as well as those of intact rock and have developed a system for such analysis. Then, they used this system to predict the stability of rock slopes of a dam site in intercalated sandstone and shale against various possible forms of instability before the excavation. The results of this investigation are presented and then are compared with those observed during and after the construction of the slopes. It is found that the developed system is proved to efficient and capable of providing reliable answers for the designers.

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Recently three major problems have cropped up concerning international conflict in the construction industry in Japan—The opening up of the domestic construction market to the American contractors, friction with the peoples of countries where Japanese contractors undertake construction projects, and the employment of foreigners to be the work force of the construction projects in Japan.
The common background of these three problems is the globalization of the world economy as well as the incredible progress of Japanese industries.
Before determining the process of finding a solution, every endeavor shall be made to ensure mutual understanding. Also, some changes in traditional Japanese society and governmental regulations should be considered.

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This paper describes the effect of ferrite by-products on collection of abalone. Shelters used in this experiment were acryl shelters, cement concrete shelters, asphalt concrete shelters and ferrite shelters which were produced through mixing ferrite byproducts with binder. Following conclusions were obtained. 1) Ferrite shelters collected more abalones than the shelters which were made of current cement concrete and asphalt concrete. 2) Abalones kept away from acryl shelters because abalones sheltered themselves from smooth, light and semi-transparent surfaces of acryl shelter. 3) Cement concrete shelters covered with ferrite asphalt mixtures collected abalones about equal to ones which all ferrite asphalt shelters collected.

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Sakai Koro Tunnel is a shield tunnel constructed under Osaka bay. This tunnel is used for transportation of natural gas. The length of the tunnel is 2130m and the deepest level of the tunnel is 45m below the ground level. The two driving shafts were constructed by the method of pneumatic caisson employing ground freezing. One of the shafts is 52m in depth and one of the deepest shafts in Japan. Sandy layer with gravel under high water pressure of 4.5kgf/cm² was excavated from the both shafts by slurry shield method. These tunnels were connected under the sea by employing ground freezing method. Since a part of the tunnel is subjected to consolidation settlement of the ground in future, elastic washers and flexible segments were installed into the tunnel at the appropriate places to release the influence.

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Demolition works of steel frame buildings, such as factory buildings for steel making plants and other heavy industries, will increase markedly, thus entailing the need of safe and economic technique including blasting demolition methods.
Blasting demolition technology for steel frame structures consists mainly of the explosive cutting technique of steel conponents, the design method for the collapse, and the reduction method of air blast especially in urban area. This study focuses on the design method for collapsing down steel frame structure by blasting. In this study, an example of the design methods for the collapse was demonstrated, and an existing steel building was razed down experimentally in various collapsing patterns (vertical collapse and holizontal collapse). Through this study and experiments, we got useful data and instructive information about blasting demolition of steel structure, which would be helpful to realize more effective and safer demolition works

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The method of marking or of quantification has been so far proposed as a method for estimating the possibility of boulder-fall on a slope. The former is of very practical use but has little statistical background, while the latter bases on statistics but is not serviceable on account of its complicated procedure. In this report, a hybrid method is developed by accepting the merits of the two methods. The superiority of the hybrid method is shown by comparing with the methods of marking proposed in the past and by applying to practical problems.

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In recent years, a number of in-ground storage tanks have been constructed because they have some advantages from viewpoints of safety, landscape and effective utilization of land space. However, the construction of in-ground tanks involves usually very deep excavation works, for which some high-level techniques are required.
Among many LNG, LPG and oil in-ground storage tanks, an example of the largescale excavation work in soft rock mass is introduced in this paper. In this work the ground behavior to the final depth of excavation has been estimated by using a simulation method on the basis of the measured data. This observational construction method has realized the highly accurate estimation of the ground behavior during the whole excavation work.

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The Matsuura thermal power plant is a joint undertaking between Kyushu Electric Power Company and Electric Power Development Company. The formar will install two 700MW units and the latter will install two 1000MW coal fired units, having a combined installed capacity of 3400MW which will be the largest coal fired plant in Japan.
This report shows the outline of design and construction of foundation improvement works for the coal storage yard. The sand compaction pile method was adopted to reduce the settlement of coal yard foundation. And the cement stabilization was carried out to improve the surface soil for the stability of stockpile.

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The launching erection of steel girders has been taking place much more often at present. There are two major methods of launching. The first uses hydraulic sliding shoes, and the second uses sliding plates and extrusion oil jacks. Both are effective methods and are selected to suit the respective characteristics. The former method was established first and applied even to a sharply curved steel girder some years ago.
However, it is only recently that there has come to be sufficient experience with the latter method. The authors have performed various investigations in order to bring about the establishment, and had an opportunity of the launching erection for a curved teel girder by using concentrated system first in Japan.
This report deals with a few discussion about the reaction force control as a result of many investigations and field measurements. Because the control which assures of the web plate strength is one of the major problems of erection.

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