Test system and test method for detecting cement content of cement mixing pile body in real time

Patent metadata

Field	Value
Publication number	US-10119240-B2
Application number	US-201615518478-A
Country	US
Kind code	B2
Filing date	Jan 6, 2016
Priority date	Oct 23, 2015
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

Abstract

The present invention discloses a test system and a test method for detecting the cement content of cement stirring pile body in real time at a construction site. The test system specifically includes a cement slurry density measuring apparatus and a cement admixing amount calculating apparatus. The method includes measuring the density of the cement slurry in the cement slurry tank, measuring the cement soil density and inputting measured values to calculate the cement content. The cement slurry density and the cement soil density can be detected in real time, so that the admixing amount of the cement can be detected in real time during the foundation reinforcing process of the underground engineering, convenience and rapidness are achieved, the time period is short, a supervision effect is good, and cheating on workmanship and materials can be effectively avoided.

First claim

What is claimed is:

1. A test system for detecting cement content of a cement stirring pile body m real time, comprising a cement slurry density measuring apparatus and a cement admixing amount calculating apparatus, wherein,
the cement slurry density measuring apparatus comprises a first electric control center, a measuring wire electrically connected with the first electric control center and a plurality of first pressure sensors; the first electric control center comprises a power supply, a switch, a voltmeter, a resistor, a data processing module and a first display module; when the measuring wire perpendicularly drops to contact with a cement slurry liquid surface from a top of a cement slurry tank, a numerical value of the voltmeter changes; the first pressure sensors are arranged at a bottom wall of the cement slurry tank, and a pressure test data is fed back to the data processing module, and a cement slurry density is calculated and then displayed on the first display module; and
the cement admixing amount calculating apparatus comprises a second electric control center and a second pressure sensor electrically connected with the second electric control center, the second pressure sensor is fixed at an end portion of, a drill bit, and the drill bit stretches into the pile body to be tested; the second electric control center comprises a data acquisition module, a single chip microprocessor, a second display module and an input module, and when data acquired by the second pressure sensor is fed bask to the data acquisition module, a cement soil density is calculated by the single chip microprocessor and then displayed on the second display module; and the cement slurry density, the cement soil density, a water cement ratio and soil density are inputted into the input module, and then the cement content is calculated by the single chip microprocessor and displayed on the second display module.

2. The test system for detecting cement content of a cement stirring pile body in real time according to claim 1 , wherein,
the number of the first pressure sensors is 2, 4 or 6, and the first pressure sensors are uniformly distributed on the bottom wall of the cement slurry tank.

3. The test system for detecting cement content of a cement stirring pile body in real time according to claim 1 , wherein,
an end portion of the measuring wire is provided with a gravity block.

4. A test method for detecting cement content of a cement stirring pile body in real time using a test system,
the method comprises the following steps:
wherein, the test system comprises a cement slurry density measuring apparatus and a cement admixing amount calculating apparatus,
the cement slurry density measuring apparatus comprises a first electric control center, a measuring wire electrically connected with the first electric control center and a plurality of first pressure sensors; the first electric control center comprises a power supply, a switch, a voltmeter, a resistor, a data processing module and a first display module; when the measuring wire perpendicularly drops to contact with a cement slurry liquid surface from a top of a cement slurry tank, a numerical value of the voltmeter changes; the first pressure sensors are arranged at a bottom wall of the cement slurry tank, and a pressure test data is fed back to the data processing module, and a cement slurry density is calculated and then displayed on the first display module; and
the cement admixing amount calculating apparatus comprises a second electric control center and a second pressure sensor electrically connected with the second electric control center, the second pressure sensor is fixed at an end portion of a drill bit, and the drill bit stretches into the pile body to be tested; the second electric control center comprises a data acquisition module, a single chip microprocessor, a second display module and an input module, and when data acquired by the second pressure sensor is fed back to the data acquisition module, a cement soil density is calculated by the single chip microprocessor and then displayed on the second display module; aid the cement slurry density, the cement soil density, a water cement ratio and soil density are inputted into the input module, and then the cement content is calculated by the single chip microprocessor and displayed on the second display module,

S1. measuring the cement slurry density in the cement slurry tank, wherein, switch of the first electric control center is closed; the measuring wire is vertically dropped from the top of the cement slurry tank; the measuring wire contacts with the liquid surface of the cement slurry when a reading of the voltmeter changes; a length h of the measuring wire and a height H of the cement slurry tank are measured; a return value P of each first pressure sensor is recorded; and the cement slurry density is calculated by the data processing module according to a formula ρ cement slurry = P/g ( H−h ), wherein g= 9.8 g/cm 3 ;
S2. measuring the cement soil density, wherein, a stress measuring signal is transmitted by the second electric control center; data P i outputted by the second pressure sensor is acquired; data P i+1 is obtained again when jetted slurry at one time is uniformly stirred; a lifting height Z of the drill bit is recorded; the cement soil, density is calculated by the single chip microprocessor according to a formula ρ cement soil =(P i+1 −P i )/gZ, wherein g=9.8 g/cm 3 ; and
S3. inputting the measured values to calculate the cement content, wherein, the cement slurry density ρ cement slurry obtained in step S1, the cement soil density ρ cement soil obtained in step S2, and data of a water cement ratio and a soil density are inputted into the input module; the cement content is calculated by the single chip microprocessor according to a formula:
cement content=(ρ soil body −ρ cement soil )ρ cement slurry /[(1+water cement ratio)(ρ cement soil −ρ cement slurry )ρ soil body ], and then displayed on the second display module.

5. The test method for detecting cement content of a cement stirring pile body in real time according to claim 4 , wherein,
the number of the first pressure sensors is 2, 4 or 6, and the first pressure sensors are uniformly distributed on the bottom wall of the cement slurry tank.

6. The test method for detecting cement content of a cement stirring pile body in real time according to claim 4 , wherein,
an end portion of the measuring wire is provided with a gravity block.

Assignees

• Univ Hohai

Inventors

• Zhang Fuhai
• Chen Qing
• Zuo Qingsong
• Yuan Saifeng

Classifications

• E02D2600/10

  comprising sensor means · CPC title

• G01N9/36

  Analysing materials by measuring the density or specific gravity, e.g. determining quantity of moisture (methods of measurement in general G01N9/02 - G01N9/32) · CPC title

• E02D33/00 Primary

  Testing foundations or foundation structures (testing methods and apparatus, see the relevant subclasses of class G01; testing structures or apparatus as regards function, in general, G01M; testing or determining chemical or physical properties, in general G01N) · CPC title

• E02D5/46

  making in situ by forcing bonding agents into gravel fillings or the soil (consolidating soil in general E02D3/12) · CPC title

• G01N9/26

  by measuring pressure differences · CPC title