Patent ID: 11946923
Assignee: QINGDAO UNIVERSITY OF TECHNOLOGY
Field: Measurement (Instruments)
Classification: CPC G  E | IPC E  G

Claim 0:
1. A device for monitoring freezing-thawing damage of an underwater concrete member in situ, wherein a main structure comprises an upper link, a concrete member, a transverse sealed box, a longitudinal sealed box, a movable guide rod, a probe launching box, a multichannel data collector, a frequency modulation transmitter, a computer, auxiliary wheels, a lower link, and a wireless temperature sensor, wherein one end of the upper link is connected to the concrete member, an other end of the upper link is connected to the transverse sealed box, the transverse sealed box is connected to the longitudinal sealed box and the movable guide rod, the longitudinal sealed box is connected to the probe launching box by using a secondary pulley disposed in the longitudinal sealed box, the probe launching box is connected to the multichannel data collector, the multichannel data collector is connected to the computer by using the frequency modulation transmitter, the movable guide rod extends through two columns of auxiliary wheels disposed on the probe launching box to be connected to one end of the lower link, an other end of the lower link is connected to the concrete member, the wireless temperature sensor is disposed on the lower link, the computer is connected to the transverse sealed box, the probe launching box, and the wireless temperature sensor, and the computer stores an equation for calculating an elastic modulus of the concrete member:, E
    2
   
   =
   
    
     39.3
     
      
       
        mE
        1
       
       (
       
        1
        -
        
         μ
         2
        
       
       )
      
      2
     
    
    
     
      16
      ⁢
      
       
        (
        
         Rv
         c
        
        )
       
       0.5
      
      ⁢
      
       τ
       2.5
      
      ⁢
      
       E
       1
      
     
     -
     
      39.3
      
       
        m
        ⁡
        (
        
         1
         -
         
          μ
          1
         
        
        )
       
       2
      
     
    
   
  
  ,, wherein E2 is the elastic modulus of the concrete member in MPa, m is mass of the probe in kg, E1 is an elastic modulus of a probe in MPa, μ2 is a Poisson's ratio of the concrete member having a dimension of 1, R is an equivalent radius of the probe in m, vc is a speed at which the probe impacts the concrete member in m/s, τ is an impact duration of the probe in s, μ1 is a Poisson's ratio of the probe having a dimension of 1, and the equivalent radius R, the Poisson's ratio μ1, the elastic modulus E1, and the mass m of the probe are known.