Foundation pile deflection measurement method based on distributed fiber sensing technique

A distributed optical fiber and sensing technology technology, applied in the field of foundation pile deflection measurement based on distributed optical fiber sensing technology, can solve problems such as deflection methods and systems that have not yet been seen, to ensure safety, improve survival rate, The effect of avoiding the possibility of being damaged

Active Publication Date: 2013-07-24
ZHEJIANG HUADONG SURVEYING MAPPING & GEOINFORMATION
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  • Abstract
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AI Technical Summary

Problems solved by technology

The distributed optical fiber sensing technology based on Brillouin scattering has outstanding advantages such as good durability, no zero drift, uncharged work, anti-electromagnetic interference, and large transmission bandwidth. It can realize continuous distribution of the parameters to be measured. , water conservancy, electric power, transportation, petrochemical, marine and other fields, but the method and system for measuring foundation pile deflection based on distributed optical fiber sensing technology has not yet been seen.

Method used

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  • Foundation pile deflection measurement method based on distributed fiber sensing technique
  • Foundation pile deflection measurement method based on distributed fiber sensing technique
  • Foundation pile deflection measurement method based on distributed fiber sensing technique

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Experimental program
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Embodiment Construction

[0037] The measurement steps of this embodiment are as follows:

[0038] a. Set a group of sensing optical cables 2 parallel to its axis at the edge of the foundation pile and arranged symmetrically with the axis as the center line; at the same time, use a transmission optical cable to connect the sensing optical cable 2 to the external Brillouin demodulator 9, The other end of the Brillouin demodulator is connected to the data analysis computer 10 through a signal line, such as figure 1 shown.

[0039] b. Using Brillouin demodulation technology to measure the compressive strain and tensile strain of each section of the foundation pile under horizontal load in real time.

[0040] c. Use the following formula to calculate the deflection of each section of the foundation pile,

[0041] f i = Σ i = 1 N [ ...

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Abstract

The invention relates to a foundation pile deflection measurement method based on a distributed fiber sensing technique. According to the foundation pile deflection measurement method based on the distributed fiber sensing technique, pile body deflection of a foundation pile can be obtained in real time, and stability of the foundation pile is monitored. The foundation pile deflection measurement method based on the distributed fiber sensing technique is characterized by comprising the following steps: (a) a group of sensing optical cables which are parallel to the axis of the foundation pipe and symmetrically arranged based on the axis serving as a center line are arranged on edges of the foundation pile; (b) by means of a Brillouin demodulation technique, compression strain and tensile strain of each section of the foundation pile under the action of horizontal load can be measured in real time; and (c) according to a formula, deflection of each section of the foundation pile can be calculated. The method is used for the pile body deflection measurement of a steel pipe pile, a reinforced concrete precast pile, a reinforced concrete bored pile and other foundation piles.

Description

technical field [0001] The invention relates to a foundation pile deflection measurement method based on distributed optical fiber sensing technology, which is mainly applicable to pile body deflection measurement of steel pipe piles, reinforced concrete prefabricated piles, reinforced concrete bored piles and other foundation piles. Background technique [0002] Foundation pile is a commonly used foundation treatment method in engineering construction. It not only bears vertical loads, but also often bears horizontal loads, such as support piles in foundation pit engineering, foundation piles under retaining walls, foundation piles under towering structures, port Foundation piles of wharf projects, foundation piles under wind power towers, foundation piles under offshore platforms, etc. In engineering design, it is generally necessary to measure the horizontal displacement of the pile top through a horizontal static load test, determine the horizontal bearing capacity of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D33/00
Inventor 陈文华张永永马鹏周科京
Owner ZHEJIANG HUADONG SURVEYING MAPPING & GEOINFORMATION
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