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:
Mar. 18, 1986
Filed:
Sep. 19, 1983
Keiji Morimoto, Yokohama, JP;
Shuichi Satoh, Ibaraki, JP;
Yoshiyuki Iwai, Ibaraki, JP;
Osamu Ae, Ibaraki, JP;
Masao Suda, Tsuchira, JP;
Kiyoshi Tsuchiya, Ibaraki, JP;
Kojiro Ogata, Ishioka, JP;
Naoki Miyanagi, Ibaraki, JP;
Nippon Telegraph & Telephone Public Corp., Tokyo, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A pipe laying apparatus having an excavator for performing excavation in the earth to form a substantially horizontally extending hole, with the excavator having connected to its trailing end a leading end of at least one underground pipe at least partially located in the horizontally extending hole, an injector for injecting a viscosity imparting liquid into the earth in which excavation is being performed by the excavator to produce viscosity imparting liquid containing soil particles. A propelling device positioned against a trailing end of the pipe and is located in a starting pit. The viscosity imparting liquid containing soil particles produced by the excavator and injector are conveyed rearwardly of the excavator past an outer periphery thereof and filled in an annular gap defined between the horizontally extending hole and the pipe while the excavator and pipe are advanced by the propelling device. A soil particle discharging device is located between the trailing end of the excavator and the leading end of the pipe and within the pipe for introducing into the pipe the viscosity imparting liquid conveyed rearwardly of the excavator past the outer periphery thereof and discharging the soil particles into the starting pit through the pipe.