Title:
METHOD AND EQUIPMENT FOR DETECTING CONCRETE-PLACING TOP END
Document Type and Number:
Japanese Patent JP3135112
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a detecting method and an equipment capable of continuously detecting the change of a placing top end.
SOLUTION: An optical fiber 12 for a temperature sensor generating scattered light having intensity corresponding to a temperature to the incidence of pulse light is inserted in the depth direction in a space 1, into which concrete 7 is injected. Pulse light is projected from the upper end of the optical fiber 12, scattered light generated in the optical fiber 1 in response to incident pulse light is detected at the upper end, and a distance from the upper end to the place of the generation of scattered light is obtained on the basis of the time up to the detection of each scattered light after the incidence of pulse light and the temperature of the place of the generation of scattered light is acquired on the basis of the intensity of scattered light, thus measuring temperature distribution in the depth direction of the space 1. A depth place, where the rate of a temperature change in the depth direction of the space 1 is maximized, is computed from the temperature distribution measured by pulse-light incidence at the time of the pouring of concrete 7, and the position of a placing top end is detected.
Inventors:
Tetsuki Kikuchi
Yukihiko Hizawa
Victory Miyoshi
Nobuyuki Matsui
Yukihiko Hizawa
Victory Miyoshi
Nobuyuki Matsui
Application Number:
JP12381096A
Publication Date:
February 13, 2001
Filing Date:
May 17, 1996
Export Citation:
Assignee:
Kashima Construction Co., Ltd.
International Classes:
E04G21/02; G01B11/00; G01B21/06; G01F23/22; G01K11/12; G01S17/88; (IPC1-7): E04G21/02; G01F23/22
Domestic Patent References:
| JP5296812A |
Attorney, Agent or Firm:
Reijiro Ichihigashi