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Patent Searching and Data


Title:
DREDGING METHOD AND DREDGING APPARATUS
Document Type and Number:
WIPO Patent Application WO/1998/020208
Kind Code:
A1
Abstract:
A dredging method and a dredging apparatus which can efficiently suck large quantities of sand and gravels deposited on the bottom of dams, rivers, harbours, etc., convey them with much saved energy as possible and can prevent diffusion of turbid water. To accomplish this object, an apparatus includes a case (2, 102) laid down into water in communication with the atmosphere. A suction pipe (3, 105) having a suction portion (7, 106) at the lower end thereof is connected to this case (2, 102). The apparatus further includes a drain pump (12, 124) for draining water inside the case (2, 102) and forming a level difference between the water level inside the case (2, 102) and the external water level and a container (109) removably disposed at an intermediate portion of the suction pipe (3, 105). The sand and gravels are sucked from the suction pipe (3, 105) into the container (109) by the siphon principle due to the level difference between the external water level and the water level inside the container (2, 102), and the container (109) is cut off and the sand and gravels are taken out when the container (109) is full.

Inventors:
Oikawa, Senji (Moburon Design Office Co. Ltd, 520-11, Koya, Yoshikaw, Matsumoto-shi Nagano 399, JP)
Application Number:
PCT/JP1997/003889
Publication Date:
May 14, 1998
Filing Date:
October 27, 1997
Export Citation:
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Assignee:
MOBURON DESIGN OFFICE CO., LTD. (520-11, Koya Yoshikaw, Matsumoto-shi Nagano 399, JP)
Oikawa, Senji (Moburon Design Office Co. Ltd, 520-11, Koya, Yoshikaw, Matsumoto-shi Nagano 399, JP)
International Classes:
E02F3/88; E02F3/90; E02F3/92; E02F7/00; E02F7/02; (IPC1-7): E02F3/88
Foreign References:
JPS62284831A
JPH01207535A
JPH03151421A
Attorney, Agent or Firm:
Watanuki, Takao (CreA Center Building, 12-9 Nakagosho 3-chom, Nagano-shi Nagano 380, JP)
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