JPH0587007U - Cable temperature measuring device - Google Patents

Abstract

(57) [Summary] [Structure] The temperature sensor 3 arranged inside the cable 2, the optical fiber 4 transmitting the temperature signal detected by this temperature sensor, and the temperature signal transmitted via this optical fiber are inputted. A temperature measuring device for a cable, which comprises a temperature analyzing unit for obtaining a predetermined temperature by means of a temperature measuring unit. [Effect] Since the temperature sensor is placed inside the cable, the actual temperature inside the cable can be obtained, unlike when using a dummy cable or attaching the temperature sensor to the surface of the cable. It is possible to accurately know the cable tension at the standard temperature (for example, 20 ° C.). Therefore, the adjustment of the cable tension becomes accurate and the erection management is improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a temperature measuring device for cables used in, for example, bridges and building structures.

[0002]

[Prior Art]

 Recently, bridges such as suspension bridges have become longer, and adjusting the tension of the cables used for them has become an important erection process.

By the way, when adjusting the tension of the cable, it is important to know the temperature of the cable itself in order to obtain the cable tension under the standard temperature. Therefore, the temperature of the cable is measured. There is.

Conventionally, when measuring the temperature, a temperature sensor is attached to the surface of the cable to measure the temperature, or a dummy of the cable is placed on the bridge girder to measure the temperature of the dummy. It was done.

[0005]

[Problems to be solved by the device]

 However, in the former measurement method, the internal temperature of the cable was not measured, and in the latter, the actual temperature of the cable was not measured, and it was possible to apply proper tension to the cable. There was a problem that I could not do it.

Therefore, an object of the present invention is to provide a cable temperature measuring device which can solve the above problems.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, a cable temperature measuring device of the present invention includes a temperature sensor disposed inside a cable, a signal transmission member for transmitting a temperature signal detected by the temperature sensor, and the signal transmission member. The temperature analysis unit receives a temperature signal transmitted through the temperature analysis unit and obtains a predetermined temperature.

[0008]

[Action]

 According to the above configuration, since the temperature sensor is arranged inside the cable, it is possible to obtain the actual temperature inside the cable, and thus the proper tension can be applied to the cable.

[0009]

【Example】

 Hereinafter, a cable temperature measuring device according to an embodiment of the present invention will be described with reference to FIGS.

The cable temperature measuring device according to the present embodiment includes a plurality of temperature sensors 3 arranged inside a suspension bridge cable 2 composed of a large number of cable strands 1, and also inside this cable 2. A signal transmission member, for example, an optical fiber 4, which is arranged, that is, arranged between the cable strands 1 and which transmits the temperature signal detected by the temperature sensor 3, and the temperature signal transmitted by the optical fiber 4 are input. And a temperature analysis unit 5 for calculating the temperature. The plurality of optical fibers 4 are bundled into one at the fixing portion 2a of the cable 2 and connected to the temperature analysis unit 5, and the temperature analysis unit 5 is arranged, for example, in a management control room.

Further, as shown in FIG. 2, the temperature sensor 3 and the optical fiber 4 are provided at a plurality of positions so that the temperature distribution of the entire cross section of the cable 2 can be detected as much as possible.

Therefore, the temperature signals obtained by the plurality of temperature sensors 3 arranged inside the cable 2 are transmitted to the temperature analysis unit 5 arranged outside the cable 2 by the optical fibers 4, respectively. In addition to calculating the temperature, the actual average temperature inside the cable 2 is obtained.

Then, the tension of the cable 2 is determined based on the obtained temperature. In this way, the actual average temperature inside the cable 2 is obtained, and the tension of the cable 2 is determined based on this temperature, so that an appropriate tension can be applied.

In the above embodiment, the temperature sensor and the optical fiber as the signal transmission member have been described as separate members, but for example, a plurality of optical fiber sensors integrated with each other are arranged in the cable. It may be one.

In the above embodiments, the cable is described as being for a suspension bridge, but of course, it can be applied to the temperature measurement of a cable for a building structure.

[0016]

[Effect of the device]

 As described above, according to the configuration of the present invention, since the temperature sensor is arranged inside the cable, it is not necessary to use a dummy cable or attach the temperature sensor to the surface of the cable as in the past. Differently, since the actual temperature inside the cable can be determined, the cable tension at the standard temperature (eg 20 ° C) can be known accurately. Therefore, the tension of the cable can be adjusted accurately and the erection management can be improved.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a cable according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a schematic enlarged plan view showing an internal structure in a B arrow portion of FIG.

[Explanation of symbols]

 1 Cable strand 2 Cable 3 Temperature sensor 4 Optical fiber 5 Temperature analysis unit

Claims (1)

[Scope of utility model registration request] 1. A temperature sensor disposed inside a cable, a signal transmission member for transmitting a temperature signal detected by the temperature sensor, and a temperature signal transmitted through the signal transmission member to which a predetermined signal is input. A cable temperature measuring device comprising a temperature analysis unit for obtaining a temperature.