Kanda river and Ochanomizu diversion channel.

Name.$B!'(BKanda river and Ochanomizu diversion channel.

Name of a country.$B!'(BJapaan.

Address.$B!'(BTokyo.

Facilities.$B!?(BRough classification.$B!'(BCity indystrial relation.

Facilities.$B!?(BDetailed classification.$B!'(BEnvironment and disaster prevention.

Usage and facilities.$B!'(BUnderground river.

Space shape classification.$B!'(BLine.

Extension.$B!J(Bm$B!K!'(B760

Area.$B!?(BSectional area.(m²)$B!'(B61

Volume.(m³)$B!'(B

Depth.(m)$B!'(B

Establishment year.$B!'(B

Composition of geological features.$B!'(BKouseki clay layer and Kouseki sandy soil layer.

Geographical features.$B!'(B

Digging industrial method.$B!'(BMud water compression shield technique.

Besides, the industrial method used.$B!'(B

Special mention matter.$B!'(BExtension and sectional area are tunnel parts.

Kanda river and Ocanomizu diversion channel.

$B!!(BTo improve the flood control safety of the Kanda river, diversion cannel is constructed under the capital road which runs side by side with the Kander river. Finish is a diversion channel tunnel of 8.8 m in inside diameter, it is designed and constructed by the shield tunneling.

Ochanomizu diversion channel.

The upstream excavation part. $B!!(BThe upstream excavation part is rectangle-ditch extension from connected part in the Suidou bridge diversion channel to the start shaft is 220 m, width of inner space is 6.8 m, and height is 8.8m." Kanda water supply stone-tube "which is the burial cultural asset is laid underground about the section of 70 km among these.
$B!!(BThe divension channel construction takes the construction from to which the excavation investigation can supply be done to do at the same time as " Kanda river water supply excavation investigation ".
$B!!(BThe part of digging in the upstream receives the earth pressure biased from the road side because it becomes construction in a rapid inclination slope part ( Kanda river left bank nethod side ), and the part of digging in the upstream uses the form of a special temporary housing because the depth of digging becomes from 12 m to 13 m.
$B!!(BMountain detaiment pailing on the mountain side is continuousness pillar row-pailing$B!J(BPIP$B!%&U(B600$B!"(BCore.H$BuC(B400$B!_(B400$B!_(B13$B!_(B21$B!"(Bl$B!a(B25m) , and the burial section of the Kanda water supple constructs steel sheel-pile.$B!J(B type,$B*$(Bl$B!a(B20m$B!K(B
$B!!(BThe earth-anchor ia used together with the short strut in this mountain detaiment pailing, it deals with the biased earth pressure. Mountain dastaiment pailing on the river side constructed continuousness pillar row-pailing$B!J(BPIP$B!%&U(B 600$B!"(BCore,H$BuC(B400$B!_(B400$B!_(B13$B!_(B21$B!"(Bl$B!a(B33m), and steel pipe sheet pile of deadine using combinedly$B!J&U(B1100$B!"(Bl$B!a(B14m).
$B!!(BA reverse-earth anchor is constructed so that steel pipe sheet pile may receive the earth pressure to which a part of mountain side is biased.
The tunnel. $B!!(BThe tunnel is extend 760 m from start shaft to the attainment part, and finish is circular tube ditch of 8.8 m in inside diameter and the system outside the shield 10.5 m. It is adjacent to slope part in Kanda river on the way and important structure such as the subway " Marunouchi " extension, Tokyo Medical and Dental University, the Higiri bridge, and Yonoshimaseitou etc. though this construction proceeds to dig this section by the mud water compression shielding technique.Therefore, these defense plans to facilities are to examine an overall technology like a structure, a construction method, and environmental mesures, etc. ,and to aim at enough safety measures.

The mud water compression shielding techmique.
$B!!(BThe tunnel is dug with the machine by the mud water compression type shield machine. The mud water compression shilding technique is the one to feed muddy water forcefully from the ground to front cutting wings of the shield machine, to roate the cutter of the shield machine while stabilizing cutting wings, and to dig the natural ground. Dug earth and sand and muddy water are separated to earth and sand muddy water in the plant on the ground after the distribution transportation with the pipe, and muddy water circulates again to cutting wings. The shield machine promotes the segment assembled backward as reaction by extending the shield jack fixed by shield machine.
Geological features.
$B!!(BAbout 300 m of the sectional where shields approach slopes most is Kouseki sandy soi layer thoug Kouseki viscous soil layer is a subject from start shaft to arrival part in the stratum which the shield passes.
The downstream excavation part.
$B!!(BThe downstream excavation part is a rectagle ditch in extend 320 m from attainment part sideward of Shouhira bridge intersection, the width of the inner space size is 6.8 m and the height is 8 m from 7 m. This section is narrow of the road, and the underground burial thing complicates, furthermore, we do to management of these defense and underground burial thing and safe construction is done because construction is adjacet line, JR Soutake line Tabisagomachi bridge, and Shouhei bridge.

Offer of material.$B!'(BConstruction technology laboratory.$B!?(B Underground space.

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