Obayashi Corporation

Kiyoshi Miya

Yoshihiro Tanaka

A segment,has segment units,obtained by dividing a cylindrical body having an appointed length into four sections along the circumferential direction. The segment units,are provided with a segment body,, a porous concrete layer,, water intake pores,, and clogging members,. The segment body,is constructed of a cast iron plate or steel plate and has an inwardly recessed portion on its outer circumferential surface. The concrete layer,is a porous material having water permeability, and is filled and solidified in the inwardly recessed portion,. The water intake pores,are formed on the flat bottom of two recessed portions,so as to penetrate the bottom, and are provided in a plurality along the circumferential direction with an appointed interval. The clogging members,are detachably screwed to the water intake pores,, wherein they clog the respective water intake pores,, and if the clogging members are removed, the water intake pores,are made open to the outside.

Segment for intake tunnels

Process for constructing intake pipe

The present invention relates to a tail structure of a shield driving machine, and in particular relates to an improvement technique of the tail sealing portion of this type of shield driving machine, in order to eliminate wearing of the tail seal. The tail structure has a first tail seal 12 and a second tail seal 14. The first tail seal 12 is provided with a tail ring 12a, a seal tube 12b and packing 12c, and the tail ring 12a is secured movably in the axial direction of a skin plate 10. The packing 12c is pressure-fitted to segments 11 in line with enlargement of the seal tube 12b and is spaced from the segments 11 in line with reduction of the seal tube 12b. The second tail seal 14 is provided with a seal tube 14a and packing 14b, wherein the packing 14b is pressure-fitted to the segments 11 in line with enlargement of the seal tube 14a and is spaced from the segments 11 in line with reduction of the seal tube 14b. When excavating, the packing 14b causes the first tail seal 12 to be pressure-fitted to the segments 11 without moving the first tail seal 12, and causes the second tail seal 14 to be spaced from the segments 11.

Tail structure of shield driving machine

The present invention relates to a shield driving machine by which eliminates excessive work of the ground when working at a curved section while suppressing an increase of the sinking of the ground surface and securing a quickening in the stability of segments. In the shield driving machine, a bulkhead 16 is provided at the tip end side of the shield driving machine body 14 of the shield driving machine 10. The chamber 18 which is formed by the bulkhead 16 and has the tip end side open is filled up with excavated earth and sand and is used to oppose the earth pressure and water pressure in the natural ground. A rotating shaft 22 which supports cross-shaped spokes 20 penetrates on the center axis of the bulkhead 16. At the shield driving machine 10, a plurality of openings 24 which discharge a part of the excavated earth and sand supplied from the chamber 18 to the rear side of the shield driving machine body 14 are provided at the hood portion 27.

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Tokyo, Japan

Kiyoshi Miya