ML20235B256

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Discusses & Recommends Methods of Design & Const for Bldg Massive Structures Such as High Dam on Bedrock.Designs Encl
ML20235B256
Person / Time
Site: 05000000, Bodega Bay
Issue date: 10/09/1964
From: Muto K
KAJIMA CONSTRUCTION CO., LTD.
To: Beck C
US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20234A767 List: ... further results
References
FOIA-85-665 NUDOCS 8709240038
Download: ML20235B256 (5)
v • d • e


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KAJIMA CONSTRUCTION CO., LTD. & .]C 5

'NO, 3.' YAESU 5 CHOME.

TELEPHONE- 261-63I1 C H U C-K U. TOKYO.

CABLE ADDRESSs

' KAJIM A TOKYO October 9, 1964 u

Dr; Clifford K. Beck .h M Deputy Director of Fegulation United St.ates Atomic Energy Commission?

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'la> angton D. C. , 20545  %^. 1> 1 MCr j RD 4

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Dear Dr. Beck,

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I received your letter dated September 9 with mKBy plFasure.

You may think me quite remiss for not answering your inquiry earlier, L but I have been badly tied up with a number of tasks which were l mostly outside Tokyo. Therefore, please accept my sincere apology

'for my delay.

l Regarding your inquiry, I also recall that we talked in our conversations about the design and construction experience in Japan of a large and musive structure on a bedrock, such as a high-dam, and about ways of surrorting a massive building. I do not think it is necessary for me to present you any detail of methods in the' treatment of the dam foundation, because the United Staten is one of the most advanced nations in this field and many of bedrock founda-tions of Japanese high-dams have been examined and strengthened as suggested by American or European consultants.

l The type of foundation that would absorb nhocks of and accommo-L date some slippage or differential movement of the ground from an earthquake, as referred to by your letter, has been a subject of earnest discussion and research among our engineers for years after Kanto Earthquake in 1923 I wrote a-few pages of an article about that type of foundation design in " Earthquake - and '41nd-Resistant Structure, Volume No. 26, Advanced Architecture Series" published in 1935, a copy of wnich is enclosed herewith. In the article, I classified that type of foundation by a name of " Isolated Structure",

by wnich I represented those structures not resting directly upon the bedrock but having some " buffers" underneath.

Several different ways of forming such " Buffer" were studied and l introduced in the past, particularly durinc a decade around 1930, by a number of engineers in the world. Among them were some mecha-nical schemes, such as Spherical Bottom Building introduced by an Italian engineer, Floating Building by an American, Roller Mounted Building by an Italian and Spring Mounted Building, while there was the other type of " Buffer" composed of natural material, such as  !

Cobble-Mound Foundation Scheme introduced by a Diitch engineer.

They are shown schematically by Figure s 2.80, 2.82, ?.83, 2.81 and 2.79 in the enclosed copy of my paper.

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Most of mechanical schemes are, however, too fantastic to be As an actual construction experience in Japan of' this realized.

type is one buildinc in Tokyo which was built in ear placed under the footings as shown by Figure 2.85 of my paper.

The conception of a Dutch engineer But, I dotonot have a lay was patented in Netherland some fourty years ugo.

believe it would work as it was intended.

it has been a very For a last couple of centuries in Jaran, f well common practice of building foundation to have a layer o b il.

compacted su,d tetween the base of a heavy struc i or a damper to absorb shocks of an earthquake, but for improvtd ng a subsoil sand layer.

condition by replecing an unsound soil with a it must have sufficient bearing capacity and stability to support dition.

a heavy load of the building even under an ide earthqua of sand, gruvel and cobble in an optimun mixing proportion t to prov ontent.

a maximum density and be compacted thquatewith an opti motion as a shock absorber in case of an earthquake, but an ear idered to be to be introduced into the dynamic analysis should be cons name as t hat of the bed rock.

desirablo to have such a layer Yet, I would recommend that it ic surroun-under ding valle the bane of the structure togetherh with i some ope tructure existence would be considerably e fective in prev earthquake.

I am very much afraid that this may not ifbeit a satisfactory woulc be any answer as ycu may anticipate, but I will be most happy help to you.

Looking forward to this having more letter will opportunities find you in very of being best ofat your service and wishing that your health, Sincerely yours,

  • ?

Kiyoshi ; uto Executive Vice President l

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