Tokyo, Japan
Tokyo, Japan

Kajima Corporation is a Japanese construction company. Founded in 1840, the company has its headquarters in Motoakasaka, Minato, Tokyo. The company is known for its DIB-200 proposal. The company stock is traded on four leading Japanese stock exchanges and is a constituent of the Nikkei 225 stock index.One of the five leading general contractors in Japan, that are also referred to as "super general contractor". As well as being one of the key opinion leaders, also from its top-class domestic construction revenue, it is seen as one of the leading companies in the construction industry in Japan. Corporate slogan is "Company that builds 100 years". Wikipedia.


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Patent
Chugoku Electric Power Co., Denki Kagaku Kogyo Kabushiki Kaisha and Kajima Corporation | Date: 2013-08-21

To provide carbonation curing equipment, a carbonated concrete producing method and a carbon dioxide fixing method with which it is possible to economically mass-produce the carbonated concrete and to greatly reduce the carbon dioxide emissions from a thermal power plant. Carbonation curing equipment 10 used for producing the carbonated concrete is equipped with a flue gas circulator 12 for supplying flue gas exhausted from a thermal power plant 1 to a carbonation curing tank 11 and for circulating the flue gas in the carbonation curing tank 11, in order to utilize the thermal power plant 1 as a carbon dioxide source for carbonation-curing an object to be cured which is held in the carbonation curing tank 11 having a shielded internal space. The flue gas exhausted from the thermal power plant 1 is supplied to the inside of the carbonation curing tank 11 without regulating the concentration and the flow rate, and the object to be cured held in the carbonation curing tank 11 is carbonation-cured.


Patent
Tokyo Electron and Kajima Corporation | Date: 2016-09-21

In order to culture the pluripotent stem cell which can be variously differentiated, while preventing the cross contamination between the different cells and securing the safety of the products; extending a main transport path 31 outwardly from a stem cell conditioning area 20, the stem cell conditioning area 20 including a treatment room 21 for inducing pluripotent stem cell from a somatic cell or an egg cell, or a treatment room 21 for receiving and conditioning pluripotent stem cell induced in other facilities; branching at least one branched transport path 32 from the main transport path 31; and arranging along each branched transport path 32, a cell culture area 40 including culture rooms 41 to 44 for culturing the stem cell and an analysis room 45 for analyzing the cultured cell, respectively. Preferably, the stem cell conditioning area 20, the cell culture area 40 and a transport area 30 including the main transport path 31 and the branched transport path 32 are provided with respective operator gates 22, (47 + 48), 33 individually, so as to prohibit coming and going of operator among the areas 20, 40, 30.


Patent
Tokyo Electron and Kajima Corporation | Date: 2014-07-11

In order to culture the pluripotent stem cell which can be variously differentiated, while preventing the cross contamination between the different cells and securing the safety of the products; extending a main transport path 31 outwardly from a stem cell conditioning area 20, the stem cell conditioning area 20 including a treatment room 21 for inducing pluripotent stem cell from a somatic cell or an egg cell, or a treatment room 21 for receiving and conditioning pluripotent stem cell induced in other facilities; branching at least one branched transport path 32 from the main transport path 31; and arranging along each branched transport path 32, a cell culture area 40 including culture rooms 41 to 44 for culturing the stem cell and an analysis room 45 for analyzing the cultured cell, respectively. Preferably, the stem cell conditioning area 20, the cell culture area 40 and a transport area 30 including the main transport path 31 and the branched transport path 32 are provided with respective operator gates 22, (47+48), 33 individually, so as to prohibit coming and going of operator among the areas 20, 40, 30.


Takaoka E.,Kajima Technical Research Institute | Takenaka Y.,Kajima Corporation | Nimura A.,Kajima Technical Research Institute
Earthquake Engineering and Structural Dynamics | Year: 2011

This paper describes the results of shaking table tests to ascertain the ultimate behavior of slender base-isolated buildings and proposes a time history response analysis method, which can predict the ultimate behavior of base-isolated buildings caused by buckling fracture in laminated rubber bearings. In the tests, a base-isolated structure model weighing 192 kN supported by four lead rubber bearings is used. The experimental parameters are the aspect ratio of height-to-distance between the bearings and the shape of and the axial stress on the bearings. The test results indicate that the motion types of the superstructure at large input levels can be classified into three types: the sinking type; the uplift type; and the mixed type. These behaviors depend on the relationship between the static ultimate lateral uplifting force on the superstructure and the lateral restoring characteristics of the base-isolated story. In the analysis method, bearing characteristics are represented by a macroscopic mechanical model that is expanded by adding an axial spring to an existing model. Nonlinear spring characteristics are used for its rotational, shear, and axial spring. The central difference method is applied to solve the equation of motion. To verify the validity of the method, simulation analysis of the shaking table tests are carried out. The results of the analysis agree well with the test results. The proposed model can express the buckling behavior of bearings in the large deformation range. Copyright © 2010 John Wiley & Sons, Ltd.


Kamagata S.,Kajima Corporation | Takewaki I.,Kyoto University
Soil Dynamics and Earthquake Engineering | Year: 2013

The Suruga Bay earthquake in 2009 attacked the Hamaoka nuclear power station and stopped the operation. The maximum acceleration 4.38m/s2 at the foundation of the reactor building of No. 5 unit was four times larger than that of No. 1 unit. It was found that the vibration amplitude at 2.5Hz is mainly related to that maximum acceleration. The records in the underground support the fact that the vibration amplification was caused in the surface soil from 25 to 100m beneath the reactor building. The non-stationary Fourier spectra clarified that the frequency of the dominant component shifted from 3.0Hz to 2.5Hz in the short transient time. The dual-peak shape in the displacement profile was assumed to consist of the fundamental mode and the local vibration mode and this was identified by the dual Ricker wavelets. This identification indicates that the vibration amplification was caused by the deformation with the amplitude of 20mm in the underground. The average strain of soil from SRφ-22 (22m underground) to SRφ-100 (100m underground) reached 0.031% which reduced 30% of shear stiffness. The rocking mode of the foundation was further observed from the vertical deformation of the foundation. By investigating the phase of the displacement profile, it was found that the natural period at the north position was longer than that at the south position, which is related to the nonlinearity of the supporting soil. © 2013 Elsevier Ltd.


Oka Y.,Yokohama National University | Imazeki O.,Kajima Corporation
Fire Safety Journal | Year: 2014

It is important to understand velocity and temperature distributions within a ceiling jet, because fire detectors operate within this region. Many researchers have worked positively to clarify ceiling jet properties by means of experimental and theoretical approaches, and sophisticated correlations have been developed to represent temperature and velocity distributions within the ceiling jet that flows under an unconfined, horizontal ceiling with smooth surface. Few studies focus on the ceiling jet that flows under an inclined ceiling. A series of pool fire tests are conducted using a smooth, unconfined model ceiling with varying inclination angles of up to 40°. Temperature distributions are measured using thermocouple rakes consisting of chromel-alumel with a strand wire diameter of 0.2 mm. Velocity distributions are also obtained using particle image velocimetry. On the basis of the measured data, empirical formulae to represent temperature and velocity distributions are developed by applying an exponential function that decays monotonically with the distance from the ceiling surface, and coefficients included in these formulae are represented as a function of the inclination angle of the ceiling. To verify the applicability of the developed formulae to an actual fire, they are compared with the full-scale test data and show a good agreement. © 2013 Elsevier Ltd. All rights reserved.


Saito T.,Kajima Corporation
Journal of Magnetism and Magnetic Materials | Year: 2010

It was determined that a wall composed of aligned strips with gaps could achieve almost the same magnetic shielding effect as a conventional solid plate wall. This new shielding system is called the "open-type magnetic shielding method." This study reports the experimental results for the magnetic shielding effect of open-type magnetic shielding walls in comparison with conventional solid plates. The magnetic field generator of the experimental model is an approximately 1/15 scale reduced train system. The magnetic shielding structure is composed of a maximum of four walls around this train model. The magnetic flux density leakage from the structures was measured. In the case of multiple walls, the results show that the open-type magnetic shielding method has a little better shielding performance than the conventional method. © 2009 Elsevier B.V. All rights reserved.


This paper presents the decay characteristics of expiratory aerosol using large-eddy simulations coupled with Lagrangian particle tracking for evaluating the prevention of pathogen infection in a typical indoor environment. Ten cases of enclosed-rooms with five different diffuser-induced airflow patterns were investigated. For particles about 10 μm in diameter, which closely approximates the mean diameter of expiratory aerosol, the decay characteristics of each case with no obstacles proved that the most efficient case was the floor-supplied displacement type, followed by the ceiling-mounted line diffuser, floor-mounted diffuser, and ceiling-mounted square diffuser. The least effective case was the ceiling-mounted four-way cassette-type air diffuser under the same air changes per hour. However, in the situation of obstacles representing human bodies, the floor- supplied displacement type showed worse decay characteristics because of preventing the "piston flow-like" one-direction flow. On the other hand, the diffuser cases of the ceiling-mounted square type and the ceiling-mounted four-way cassette-type showed improved decay speed by exhaust and deposition. In particular, the ceiling-mounted square diffuser showed the most effective removal performance. These results imply that the flow configurations that induce small circulation caused by the inlet-outlet layout tend to improve the decay characteristics in terms of "the robust flow design" in a situation of complex flow field. © 2013 Tsinghua University Press and Springer-Verlag Berlin Heidelberg.


Patent
Kajima Corporation and SANYO Electric Co. | Date: 2013-04-10

A solar cell panel is installed in an outer wall of a building structure for generating power from both front and rear surfaces with high power generation efficiency. A panel package (9) including a plurality of double-side power generation type solar cell panels (5) or a group of plural solar cell panels 5 arranged across a plurality of stages in a height direction is supported by vertical members (4, 4) supported by arm members (8, 8) overhung in a structural out-of-plane direction from an outer wall face (2) having an opening (3) and juxtaposed with an interval in a structural in-plane horizontal direction of the outer wall face (2) while the panel package (9) faces the outer wall face (2). The solar cell panel (5) or the panel package (9) is arranged between overhang members (12, 12) protruded side by side in a height direction to the exterior side of each vertical member (4) and juxtaposed in a structural in-plane horizontal direction, and the upper and lower portions of the solar cell panel (5) or the panel package (9) are directly or indirectly held by the overhang members (12, 12) juxtaposed in a height direction.


A method for manufacturing a concrete structure comprises an installation step of installing a formwork 30 for concrete placement, a placement step of performing concrete placement in a state where a curing sheet 10 is attached to an inner surface of the formwork 30, and a demolding step of removing the formwork 30 after placement of concrete C. A contact angle of a contact surface of the curing sheet 10 for use in the placement step with water is 50 degrees or more, wherein the contact surface faces the concrete. Thus, generation of bleeding water is suppressed.

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