( is a Japanese construction company. Founded in 1840, the company has its headquarters in Moto-Akasaka

Akasaka, Tokyo

is a residential and commercial district of Minato, Tokyo, located west of the government center in Nagatachō and north of the Roppongi nightlife district....

, Minato

Minato, Tokyo

is one of the 23 special wards of Tokyo, Japan. As of 1 March 2008, it had an official population of 217,335 and a population density of 10,865 persons per km². The total area is 20.34 km².Minato hosts 49 embassies...

, Tokyo

Tokyo

, ; officially , is one of the 47 prefectures of Japan. Tokyo is the capital of Japan, the center of the Greater Tokyo Area, and the largest metropolitan area of Japan. It is the seat of the Japanese government and the Imperial Palace, and the home of the Japanese Imperial Family...

. The company is known for its DIB-200

DIB-200

DIB-200 is a possible mixed use supertall skyscraper project proposed by Kajima Construction and designed by Sadaaki Masuda and Scott Howe. If constructed, it would be tall...

 proposal.

Demolition Technology

The Kajima Corporation developed a building demolition

Demolition

Demolition is the tearing-down of buildings and other structures, the opposite of construction. Demolition contrasts with deconstruction, which involves taking a building apart while carefully preserving valuable elements for re-use....

 technique that involves using hydraulic jacks to demolish a building one floor at a time. This method is safer, and allows for a more efficient recycling

Recycling

Recycling is processing used materials into new products to prevent waste of potentially useful materials, reduce the consumption of fresh raw materials, reduce energy usage, reduce air pollution and water pollution by reducing the need for "conventional" waste disposal, and lower greenhouse...

 process. In the Spring of 2008, the Kajima Corporation used this technique to demolish a 17-story and 20-story building, recycling 99% of the steel

Steel

Steel is an alloy that consists mostly of iron and has a carbon content between 0.2% and 2.1% by weight, depending on the grade. Carbon is the most common alloying material for iron, but various other alloying elements are used, such as manganese, chromium, vanadium, and tungsten...

 and concrete

Concrete

Concrete is a composite construction material, composed of cement and other cementitious materials such as fly ash and slag cement, aggregate , water and chemical admixtures.The word concrete comes from the Latin word...

 and 92% of the interior materials in the process.

Film backing

The Kasumigaseki Building

Kasumigaseki Building

The is a 30-story skyscraper located in Kasumigaseki, Chiyoda, Tokyo. The building is widely regarded as the first modern office skyscraper in Japan...

, built by Kajima, is the main subject of the film Chōkōsō no Akebono

Chōkōsō no Akebono

is a 1969 Japanese film about the construction of the Kasumigaseki Building, then the tallest building in Japan. Kajima Construction, the builder of the Kasumigaseki building, was also the backer of the film. Mark Schilling of The Japan Times said that Kajima reportedly pushed 1.7 million advance...

, which was backed by Kajima.

External links

Official site English site