Measuring and testing – Fluid pressure gauge – With fluid pulsation dampener
Patent
1980-01-07
1982-06-01
Howell, Kyle L.
Measuring and testing
Fluid pressure gauge
With fluid pulsation dampener
73 73, 73700, G01L 1100
Patent
active
043321720
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a device for determining the pore water pressure in a soil, and more particularly in clay.
At present there are a large number of different methods of determining pore water pressure. A distinction is made between open and closed measuring systems. In a closed measuring system only a small change in volume is needed for recording the pressure, whereas in an open system a large change in volume is necessary. This invention is primarily intended for the measurement of the pore water pressure in clays, and comprises a closed measuring system.
In the Swedish Patent specification with the publication No. 389 923 there is disclosed a method and a device for determining the pore water pressure in a soil. The measuring system comprises a closed system and is characterized by a measuring device which is connected by means of a nipple to the pore pressure sound. When a stabilized pore pressure reading is obtained, the measuring device is disconnected, and a sealing device which closes the nipple is connected to the nipple on the pore pressure sound. At the next measuring occurrence the sealing device is first removed, and the measuring device is thereafter connected to the pore pressure sound, etc. From the removal of the sealing device until the application of the measuring device to the pore pressure sound a certain time passes, which signifies that the initial pressure in the pore water adjacent the pore pressure sound is changed. This means that one has to wait a certain time before a stabilized reading of the pore pressure can be recorded. If the soil consists of clay, it is necessary when using the measuring system according to the said patent to wait about 15 to 20 minutes for obtaining a stabilized reading.
The object of the present invention is to provide an improvement of the existing measuring system, primarily with a view to make possible a considerable shortening of the necessary waiting period for obtaining a stabilized measuring value. This object of the invention and others are attained by a device having the features claimed in the appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS
Below embodiments of the new invention will be described with reference to the drawings on which
FIG. 1 shows an embodiment of the device according to the invention;
FIG. 2 is on a larger scale a cross section view through an embodiment of the pore pressure sound and the measuring device connected together;
FIG. 3 on a larger scale is a cross section view of an embodiment of the pore pressure sound and the measuring device disengaged from each other.
In FIG. 4 an alternative embodiment of the pore pressure tip is shown, to be used together with the device according to FIG. 1.
FIG. 5 shows an alternative embodiment of the device according to the invention;
FIG. 6 is on a larger scale a cross-section view of an embodiment of the pore pressure sound, to be used in connection with the device according to FIG. 5.
FIG. 7 is a cross-sectional view of, an alternative embodiment of the nipple 4 to be used with all the embodiments of the pore pressure sounds.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The basic structure of the device shown in FIG. 1 corresponds to the one according to the Swedish Pat. No. 7506203-4. Thus, a liquid-filled tube 1 is sunk into the ground. At the lower end of tube 1 a pore pressure sound is fitted, of which embodiments will be described in greater detail with reference to FIGS. 2, 3, 4, 5 and 7.
The structure shown in FIG. 1 further includes a measuring device 3 which has been lowered down into the tube 1, with via a sealing connection is fitted on the pore pressure sound 2. The measuring device 3 is connected to an electronic recording device 5 via a cable 6.
The embodiment shown in detail in FIGS. 2 and 3 includes a pore pressure sound 2, which has a filter 7, preferably of a ceramic material, which partly encloses a sound tip 8, preferably of thermoplastics. At the lower end of the sound tip 8 a protection sheath 9 is mounted, which is pressed on. The filter 7
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patent: 2878671 (1959-03-01), Prosser
patent: 3043133 (1962-07-01), Richards
patent: 3091115 (1963-05-01), Roberts
patent: 3178944 (1965-04-01), Templeton
patent: 3318140 (1967-05-01), Shields
patent: 3374664 (1968-03-01), Lefelholz
patent: 3456509 (1969-07-01), Thordarson
patent: 3574284 (1971-04-01), Thordarson
patent: 4068525 (1978-01-01), Skaling
Corr Denis E.
Howell Kyle L.
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