Title:
発進口の形成方法および発進口構造
Document Type and Number:
Japanese Patent JP7389698
Kind Code:
B2
Abstract:
To provide a forming method of a starting port capable of connecting a pit and a main pipe using a predetermined length of propulsion pipe regardless of a disposition of an above-ground building and an underground structure.SOLUTION: A forming method of a starting port 10b for starting a propulsion pipe 15 from a side wall of a vertical steel pit 10a with a small diameter toward a main pipe 17 diagonally below includes the steps of forming a pit port for inserting a guide pipe 11 having a larger diameter than the propulsion pipe, press-fitting the guide pipe from the pit port, filling a first filling material 12 for water cut-off in a gap of the press-fit guide pipe and the pit port, drilling the inside of the guide pipe, and attaching a water cut-off packing 14 having an insertion hole 14c for inserting the propulsion pip at a tip of the guide pipe.SELECTED DRAWING: Figure 2
Inventors:
Hiroaki Muranaka
Takeshi Doi
Takeshi Doi
Application Number:
JP2020059555A
Publication Date:
November 30, 2023
Filing Date:
March 30, 2020
Export Citation:
Assignee:
Okumura Gumi Co., Ltd.
International Classes:
E21D9/06
Domestic Patent References:
| JP2000345791A | ||||
| JP2018003264A | ||||
| JP2003129790A | ||||
| JP8210083A |
Attorney, Agent or Firm:
Patent Attorney Showa International Patent Office