The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 18, 1986
Filed:
Sep. 28, 1984
Hiroshi Yamamoto, Ibaraki, JP;
Shuichi Satoh, Sendai, JP;
Yoshiyuki Iwai, Takamatsu, JP;
Osamu Ae, Kyoto, JP;
Masao Suda, Tsuchiura, JP;
Minoru Shiozaki, Ibaraki, JP;
Kiyoshi Tsuchiya, Ibaraki, JP;
Manabu Nakano, Ibaraki, JP;
Kojiro Ogata, Ishioka, JP;
Naoki Miyanagi, Ibaraki, JP;
Kozo Ono, Toride, JP;
Nobuyuki Tobita, Mito, JP;
Nippon Telegraph & Telephone Public Corp., Tokyo, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A pipe laying apparatus including an excavator propulsion unit located in a starting pit. The excavator includes an excavator body having a first axis, an excavating tool having a second axis and located at a forward end portion of the excavator body, and injection ports formed in the excavating tool for injecting a viscosity imparting liquid into soil as excavated. The excavator body has a rearward portion thereof disposed adjacent pipes to be laid each having an outer diameter smaller than the outer diameter of the excavating tool and positioned at a rearward end thereof against the propulsion means, and is operative to excavate the earth to form a hole therein while the viscosity imparting liquid is being injected through the injection ports into the soil as excavated to thereby produce a viscosity imparting liquid containing soil which is conveyed rearwardly through an outer periphery of the excavator body while being filled in an annular clearance defined between the hole formed in the earth and the pipes to be laid, so that the pipes can be successively laid as the excavator body and the pipes are propelled forwardly by the propulsion unit.