PRE-STRESSED CONCRETE

TANK
Proposal on introduction of PC tank
A rational and economical system can be built by including a Pre-stressed Concrete (itis hereafter written as PC) tank in a water distribution system. A PC tank is thestructure which has a good track record for 50 years or more in Japan where is anearthquake-prone country, and it is rich in earthquake resistance and durability. In theprevious Great East Japan Earthquake(2011), the outstanding earthquake resistance ofthe ground type PC tank was proved, and it was strong also to tsunami.

Benefits of service reservoir
・IF a service reservoir is installed in heights or flat grounds, water can be supplied under a nature style.
And it can build the efficient system which requires low electric power used. Furthermore, since water canbe supplied also in the time of power failure, it doesn’t prevent the water supply or firefighting in anemergency.
・In pump pressure feed, pump capability can be suppressed by combining a ground type service reservoir.
(It utilizes as an object for water pressure control of a distributing pump. Specifically a service reservoir isprepared near the end of a water pipe, it is made full of water at the night time of a water pressure rise,
and water pressure change is lessened by supplying water to time with much amount of the daytime usedfrom both a riverhead and a service reservoir.)① Gravity flow
H.W.L

Hydraulic gradient

L.W.L

Reservoir

h1

Pipe

h2

h1：hydraulic gradient (MAX)h2：hydraulic gradient (MIN)

Distribute② Pumped distribution
Hydraulic gradient

H
H.W.L

h1

H

L.W.L

Ph2

PipeReservoir

H：head of fluid

Distribute

Comparison of a water distribution system

Pioneer of the PC Technology

ABE NIKKO KOGYO CO., LTD.
Gifu Head Office
Tokyo Head Office
Sri Lanka Office

3-13-3, Rokujyo-Ohmizo, Gifu-shi, Gifu, JapanSK Building-S, 3rd Floor, 2-3-18, Shimo-ochiai, Shinjuku-ku,
Tokyo 161-0033 Japan
12A, Bawa Place, Colombo 08, Sri Lanka

WEB : http://www.abe-nikko.co.jp/
PHONE : +81-58-271-3391 FAX: +81-58-273-3796
PHONE : +81-3-5906-5631 FAX : +81-3-5906-5270
PHONE : +94-77-0721643

E-MAIL：srilanka@abe-nikko.co.jp

Benefits of PC Tank
・PC tank is extremely strong. It withstood the earthquake and tsunami of the Great East Japan
Earthquake 2011.（When a water service reservoir is built on a housing high density place or heights,
if it collapses with disasters such as an earthquake, we will be anxious about a third party disaster,
however the safety will be ensured if it is a strong PC tank.）① PC tank installing in area intensity 71)
L：Complete view of PC tank (with nodamage),
R：Crack in the surrounding ground・PC tank is operable withminimum②

PC tank affected by thunami1)
L：Street lights and telephone poles collapsed,
R：damages by a collision of overflow things

maintenance after built.

( PC tank for service life beyond 100 years)
・A cylinder type tank is rational form, and economical with few material used. And a tank which has alarge capacity is more advantageous in initial cost.
・A cylinder type tank has the strong resistance over earth pressure, so it can be laid in underground.
・Various form and designs are made possible with ground type, elevated type, and etc.
（By making reservoir water revel high, water can be stored in big capacity at few sites.）③ Underground type
④ Elevated type

⑤ Mixed form withground type andelevated type

Bibliography:1)Japan Prestressed Concrete Institute, Higashi Nihon Daishinsai PC Kouzoubutsu Saigai Chousa
Houkokusho (The research report for the Great East Japan Earthquake ), 2011