JP4570825B2 - Method and apparatus for automatically recognizing different fluids - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, when different types of fluids are fed by the same liquid feed line, the type of the fluid is discriminated in the liquid feed line, and the accurate instruction and quantification to the destination and the recording thereof are performed. The present invention also relates to an automatic recognition method for heterogeneous fluids and an apparatus therefor.
[0002]
[Prior art]
For example, in the construction of foundation piles, the earth and auger equipped with a bit having a high-pressure injection hole at the tip end is used to excavate the soil at the tip of the pile in cooperation with the high-pressure water jetted from the high-pressure injection hole. After reaching the support layer, the construction method is generally employed in which the spray water is switched to cement milk, high-pressure spray is performed at a predetermined pressure, and then a bit is pulled up at a predetermined speed to construct an enlarged bulb having a predetermined diameter and a predetermined strength. .
[0003]
In the above work, when the bit is raised, the work instructor tells the valve switching worker the instruction to switch from water to cement milk, and then the work instructor sends a signal from the valve switching worker that the switch has been completed, Taking into account the amount of residual water, an auger operator has been instructed to raise the bit by an empirical method that the cement milk has reached the tip of the bit.
[0004]
[Problems to be solved by the invention]
However, in the above method, when the distance between the cement milk plant and the construction site is long, that is, when the amount of line replacement is large, it is determined whether cement milk of a predetermined concentration has reached the tip of the bit, in other words, For example, an error may occur frequently in the timing of raising the bit.
[0005]
Also, in order to pull up the bit at a constant speed while maintaining a predetermined diameter (predetermined strength) when pouring cement milk, the voltage drops for some reason, and the cement milk liquid feeding pressure drops (insufficient flow rate). When this occurs, a basic problem in quality control is brought about in that a bulb having a predetermined diameter (predetermined strength) cannot be built.
[0006]
The present invention eliminates the above-mentioned conventional problems, provides an underground composition having a predetermined diameter and a predetermined strength, and enables an automatic recognition method and apparatus for different fluids that enable measurement and recording necessary for quality control. Is to provide.
[0007]
[Means for Solving the Problems]
As a means for solving the above-mentioned problems, the method for automatically recognizing a heterogeneous fluid according to the present invention switches from a source of water and a heterogeneous fluid of cement milk to a fluid of either water or cement milk through the same liquid feed line. The fluid pressure is detected in the middle of the fluid feed line that feeds the fluid to the bit at the tip of the earth auger, and whether the fluid flowing based on the pressure detection signal is water. It is characterized by determining whether it is cement milk .
In addition, the apparatus for automatically recognizing different types of fluids according to the present invention feeds liquids while switching from water and cement milks to different fluids of either water or cement milk through the same liquid feed line. pressure sensing means for detecting the pressure of said one of fluids flowing through the fluid feed liquid feed in line in the middle portion of the line for feeding the liquid to the tip of the bit of the auger is provided, the liquid feed in line by the pressure detection means It is characterized in that a detection signal of the pressure of the flowing fluid is obtained, and whether the flowing fluid is water or cement milk is determined based on the detection signal of the pressure .
[0008]
As the pressure detecting means, a casing that is installed on the outer side of the pipe constituting the liquid feed line and is opened facing the pipe, and a pressure receiving surface that is slidably inserted in the casing faces the pipe. And a support means including a spring that movably supports the piston and applies back pressure to the piston, and a detector that detects the amount of movement of the piston and transmits a detection signal thereof. Piston type or housing installed outside the pipe constituting the liquid feed line and opened facing the pipe, a diaphragm stretched in the housing, a spring for applying a back pressure to the diaphragm, and the diaphragm A diaphragm type composed of a detector that detects the displacement of the sensor and transmits a detection signal thereof can be employed.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to embodiments shown in the drawings.
[0010]
FIG. 1 is a block diagram of an embodiment of the present invention, in which water or cement milk is ejected from a bit 2 at the tip of an earth auger 1 at a high pressure to excavate the ground and create an underground bulb after excavation. Illustrated.
[0011]
The earth auger 1 is supplied with water or cement milk as a fluid from a plant 3 as an example of a fluid supply source using the same liquid feed line 4 (piping system). In the line 4, a flow meter 5 (electromagnetic flow meter) for measuring the flow rate is provided upstream, and a pressure detector 6 as pressure detection means for detecting fluid pressure is also provided on the downstream side.
[0012]
The instantaneous flow rate a and the integrated flow rate b are input to the flow rate / pressure recording device 7 as flow rate detection signals from the flow meter 5, and the instantaneous flow rate and the integrated flow rate 7 are displayed on the instantaneous flow rate display unit 9 of the flow rate / pressure recording device 7. Numeric value is displayed by segment display.
[0013]
The detected pressure value c from the pressure detector 6 in conjunction with this are input to the flow rate and pressure recording device 7, an instantaneous pressure instantaneously the pressure display section 8 of the flow rate and pressure recording device 7 is numerically displayed by the 7-segment display It has become so.
[0014]
On the other hand, the flow rate / pressure recording device 7 is connected to the personal computer 11 via the ATA card 10 (equivalent to 20 MB), and the construction status, site name, pile number, and other construction records are stored and analyzed.
[0015]
As the pressure detection means, piston-type pressure sensors 6A and 6B exemplified in FIG. 2 and diaphragm-type pressure examples illustrated in FIG. 3 are used.
[0016]
In FIG. 2, a piston type pressure detector 6 </ b> A is installed on the outer surface of the pipe 4 a constituting the liquid feed line 4 and opens in the pipe 4 a, and is slidable in a liquid-tight manner in the casing 12. A piston 13 that is inserted and the pressure-receiving surface 13a faces in the tube 4a, a support portion 15 that includes a spring 14 that supports the piston 13 so as to be movable and applies back pressure to the piston 13, and the piston The detector 16 detects the amount of movement 13 and transmits the detection signal as a pressure signal.
[0017]
On the other hand, in cutting work, the flow pressure varies depending on the type (characteristic) of the fluid flowing through the liquid feed line 4 . For example, as shown in FIG. 4, the flow pressure when sending cement milk is higher than the pressure when sending water. Therefore, the pressure applied to the pressure receiving surface 13a of the piston 13 is also different between water and cement milk. When the fluid is water, the movement amount of the piston 13 is small, and when the fluid is cement milk, the movement amount of the piston 13 is small. large ing. Therefore, by detecting the movement state of the piston 13 with the detector 16, it is possible to detect the fluid and know what the fluid is.
[0018]
The diaphragm type pressure detector 6B shown in FIG. 3 is installed on the outer surface of the pipe 4a constituting the liquid feed line 4 and opens in the pipe 4a. The diaphragm 17 is stretched in the housing 17. A diaphragm 18, a spring 19 that applies back pressure to the diaphragm 18, and a detector 20 that detects the displacement of the diaphragm 18 and transmits the detection signal as a pressure signal.
[0019]
Also in this diaphragm type pressure detector 6B, since the displacement amount of the diaphragm 18 differs depending on the type of the fluid flowing through the liquid feed line 4, it is possible to immediately know the flow rate pressure and the type of the currently flowing fluid.
[0020]
Therefore, for example, while excavating the ground while water is sprayed from the tip of the bit 2 of the earth auger 1, the fluid is switched from water to cement milk when the excavation depth reaches the support layer and then excavates to a predetermined depth. Then , when it is determined that the cement milk has reached the tip of the bit 2, the pulling up of the bit 2 is started at a predetermined speed and a bulb is formed, but the bit 2 after the switching from the water to the cement milk is performed. The pulling timing can be accurately grasped by knowing the pressure detection value.
[0021]
FIG. 4 shows a graph of flow rate pressure-time of water and cement milk. In this figure, when the flow rate pressure (MPa) = X is within a certain range, the flow type is as follows.
[0022]
1) O ≦ X <A; Stop 2) A ≦ X <B; Water 3) B ≦ X; Cement milk Here, in FIG. 4, when water is flowing in the liquid feed line 4, the threshold pressure Although a pressure smaller than B is detected, when switching from water to cement milk, the cement milk flows in the liquid feed line 4 while pushing out water, and the pressure gradually increases. When the pressure continues to rise after elapse of t time (3 seconds) exceeding the threshold pressure B, the inside of the liquid feed line 4 is completely replaced with water from the cement milk. determining the cement milk has reached the tip of the bit 2 in the value 3 seconds after the point when exceeding the pressure B).
[0023]
【The invention's effect】
As described above, according to the present invention, when the distances between the water, the cement milk supply source, and the construction site are separated, that is, even if the line replacement amount of the piping system is large , the line pressure is set to the threshold pressure and time. Since it is possible to determine the time when the cement milk reaches the tip of the bit, it is possible to accurately grasp the timing of lifting the bit.
[0024]
Further, if the present invention is used, quality control and recording for submission can be performed simultaneously in addition to measurement, so that the number of workers can be reduced.
[0025]
Furthermore, when the composition change of the fluid occurs and deviates from the set range, warnings and measures such as suspension of liquid feeding and correction can be taken promptly, leading to prevention of quality deterioration.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an embodiment of the present invention.
2 is a cross-sectional view showing a piston-type pressure detector as an example of pressure detecting means in FIG. 1. FIG.
FIG. 3 is a cross-sectional view showing a diaphragm type pressure detector.
FIG. 4 is a graph of flow rate pressure-time.
[Explanation of symbols]
1 Earth auger 2 Bit 3 Plant (fluid supply source)
4 Liquid feed line 5 Flow meter 6 Pressure detection means (pressure detector)
6A Piston type pressure detector 6B Diaphragm type pressure detector 7 Pressure recording device 12 Casing 13 Piston 16 Detector 17 Housing 18 Diaphragm 20 Detector

Claims (5)

While switching from the source of heterologous flow animals of water and cement milk through the same liquid feed line to any flow of water or cement milk to liquid feed and liquid feed to the tip of the bit in the earth auger of the liquid feed line An automatic recognition of a heterogeneous fluid characterized by detecting the pressure of the fluid in the middle and determining whether the fluid flowing is water or cement milk based on the pressure detection signal Method. While switching from the source of heterologous flow animals of water and cement milk through the same liquid feed line to any flow of water or cement milk to liquid feed and liquid feed to the tip of the bit in the earth auger of the liquid feed line A pressure detection means for detecting the pressure of any one of the fluids flowing in the liquid feed line is provided in the middle, and a detection signal for the pressure of the fluid flowing in the liquid feed line by the pressure detection means is obtained, An apparatus for automatically recognizing different types of fluids, wherein it is determined whether the fluid flowing is water or cement milk based on a pressure detection signal.   A flow meter for measuring the flow rate of the fluid is interposed between the fluid supply source and the pressure detection means, and the delivery is recorded based on a measurement signal from the flow meter. 2. An automatic recognition apparatus for heterogeneous fluids according to 2. The pressure detection means is installed on the outer side of the pipe constituting the liquid feed line and is opened facing the inside of the pipe, and the pressure receiving surface is inserted into the casing so as to be liquid-tight and slidable. And a support means including a spring that movably supports the piston and applies back pressure to the piston, and a detector that detects the amount of movement of the piston and transmits a detection signal thereof. 4. The apparatus for automatically recognizing a heterogeneous fluid according to claim 2 or 3 . The pressure detection means includes a housing that is installed on the outer side of the pipe constituting the liquid feed line and is opened facing the pipe, a diaphragm that is stretched in the housing, and a spring that applies back pressure to the diaphragm, 4. A device for automatically recognizing different fluids according to claim 2 or 3 , comprising a detector for detecting displacement of the diaphragm and transmitting a detection signal thereof.

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