JPH0377334B2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" The present invention relates to an earth and sand pumping device.

"Prior Art" An example of this type of earth and sand pumping device will be described with reference to FIG. 4. In this earth and sand pumping device, an earth and sand pump 1 such as a hose type, a screw type, or a piston type is disposed in an earth and sand storage tank 2, and an earth and sand pumping pipe 3 is connected to the earth and sand storage tank 2. An injection device 11 as a means for supplying a viscosity imparting agent (water, bentonite solution, etc.) 5 is installed in a place separate from the sediment storage tank 2, and an injection pipe 9 is connected to the injection device 11.
The base end of the injection pipe 9 is connected, and the injection port 10 at the tip of the injection pipe 9 faces the upper opening of the sediment storage tank 2, so that the injection device 11 and the sediment storage tank 2 are communicated with each other.
The discharge side end of the conveyor 7 for transporting earth and sand is made to face the upper opening of the earth and sand storage tank 2. Next, the operation of the above-mentioned earth and sand pumping device will be explained. First, the conveyor 7, the injection device 11, and the sand pressure pump 1 are operated. Then, the earth and sand 6 conveyed by the conveyor 7 is once supplied to the earth and sand storage tank 2 and stored therein, and the viscosity imparting agent 5 is injected from the injection device 11 into the earth and sand storage tank 2 through the injection pipe 9. Then, the earth and sand in the earth and sand storage tank 2 is discharged from the discharge port 4 of the earth and sand pump 3 through the earth and sand pump 3 by the earth and sand pump 1 to a target location.

In such an earth and sand pumping device, the viscosity imparting agent 5
The most important thing is to convert the properties of the earth and sand 6 to be pumped by injecting an appropriate amount of sand into a property that can be pumped near the capacity of the earth and sand pump 1. In other words, if the properties of the earth and sand 6 to be pumped are too hard, the earth and sand 6
When the pipe resistance becomes large and exceeds the capacity of the earth and sand pump 1, pumping becomes impossible. For this reason, it is necessary to lighten the properties of the earth and sand 6.
On the other hand, if the properties of the earth and sand 6 are too soft, the earth and sand 6 becomes muddy or muddy and becomes industrial waste, which requires complicated and troublesome post-treatment work. For this,
There is a request to make the soil 6 harder. In this way, in order to satisfy the above-mentioned two conflicting conditions, that is, to convert the properties of the earth and sand 6 into properties that do not require post-treatment work and can be pumped within the capacity of the earth and sand pump 1, It is important to adjust the injection amount of the viscosity imparting agent 5.

Hereinafter, a method for adjusting the injection amount of the viscosity imparting agent 5 will be explained.

(1) Adjust the injection amount of the viscosity imparting agent 5 while checking the properties of the earth and sand 6 discharged from the discharge port 4 of the earth and sand pumping pipe 3.

(2) Adjust the injection amount of the viscosity imparting agent 5 by estimating the load condition of the earth and sand pump 1, for example, the hydraulic pressure if the earth and sand pump 1 is hydraulically driven, or the current, etc. if it is electrically driven. do.

(3) Adjust the injection amount of the viscosity imparting agent 5 by checking the properties of the sediment 6 in the sediment storage tank 2.

"Problems to be Solved by the Invention" However, the above adjustment method has the following problems.

The above-mentioned adjustment method (1) involves a time delay because the injection amount of the viscosity imparting agent 5 is adjusted by looking at the properties of the earth and sand 6 discharged from the discharge port 4 of the earth and sand pump 3. That is, it takes time for the earth and sand 6 in the earth and sand storage tank 2 to pass through the earth and sand pumping pipe 3 and be discharged from the discharge port 4 of the earth and sand pumping pipe 3. Therefore, when a certain earth and sand 6 is supplied into the earth and sand storage tank 2, and when the earth and sand 6 is supplied to the earth and sand pumping pipe 3,
There is a time difference (delay) between the time when the liquid is discharged from the discharge port 4 and the time when the liquid is discharged from the discharge port 4. As a result, if the properties of the earth and sand 6 discharged from the discharge port 4 of the earth and sand pump 3 are different from the properties of the earth and sand 6 in the sediment storage tank 2, for example, the earth and sand discharged from the discharge port 4 of the earth and sand pressure pipe 3 are different. 6 is soft, and conversely, the earth and sand 6 in the earth and sand storage tank 2 is hard, and it is not possible to accurately inject the viscosity imparting agent 5 in an amount commensurate with the properties of the earth and sand 6 in the earth and sand storage tank 2. In particular, the longer the length of the earth and sand pumping pipe 3, the greater the time delay, and the above-mentioned problems become more noticeable. In addition, the properties of the earth and sand 6 discharged from the discharge port 4 of the earth and sand pumping pipe 3,
Even if it is assumed that the properties of the sediment 6 in the sediment storage tank 2 are the same, what is the standard for determining the viscosity imparting agent 5?
It is unclear whether it is appropriate to determine the injection amount. That is, the earth and sand 6 in the earth and sand storage tank 2 are mixed with the viscosity imparting agent 5.
It is unclear what kind of properties result from the injection. In the end, the amount of viscosity imparting agent 5 to be injected is adjusted based on intuition, so there is little hope of efficiently pumping the earth and sand 6 that does not require post-treatment.

The adjustment method (2) above adjusts the injection amount of the viscosity imparting agent 5 by detecting the piping resistance over the entire length of the earth and sand pumping pipe 3, so the injection amount of the viscosity imparting agent 5 can be accurately adjusted. cannot be adjusted. In other words, since piping resistance is detected over the entire length of the earth and sand pumping pipe 3, if a certain amount of earth and sand 6 with different properties does not enter the earth and sand 6 having a certain property into the earth and sand pumping pipe 3, the pipe resistance will increase. does not appear in changes in For example, in the case where the total length of the earth and sand pumping pipe 3 is 100 m, if earth and sand 6 of a certain nature is being pumped and 5 m of earth and sand 6 that is harder and has a higher piping resistance than that earth and sand 6 enters the earth and sand 6, the piping resistance will be The change in the detected value is only 1/20 at 5 m/100 m, making it impossible to accurately detect piping resistance and making it impossible to accurately adjust the injection amount of viscosity imparting agent 5. Particularly in the case of hydraulic pressure, when the hydraulic pressure increases, the resistance of the seal part of the earth and sand displacement pump 1 increases and the initial resistance changes, and the back pressure changes depending on the oil temperature and the hydraulic pressure changes, and the piping resistance increases due to other factors. Often influenced by factors. Therefore, one possible method is to determine the injection amount of the viscosity imparting agent 5 when the piping resistance changes significantly, that is, when the detected value of the piping resistance is significantly affected. Large amount of earth and sand pumping pipe 3
Because it has to be placed inside the pipe, it takes time for a significant change to occur in the piping resistance, resulting in a time lag. Therefore, problems similar to those of the adjustment method (1) described above arise. Furthermore, since it is necessary to put a large amount of earth and sand 6 of different properties into the earth and sand pumping pipe 3, for example, there may be a case where a large amount of earth and sand 6 that is hard in nature and has a large piping resistance is put into the earth and sand pumping pipe 3. Unless a sand pump 1 with sufficient capacity is used, it will not be possible to pump the soil. Therefore, it is necessary to equip a sand pump 1 with sufficient capacity, which increases the cost. Furthermore, even if the piping resistance is detected with high accuracy, for example, when 1 m of earth and sand 6 with different properties enters the earth and sand pumping pipe 3 with a total length of 100 m, the piping resistance will be 1/100, and the minute change in the piping resistance will be Even if it is possible to detect soil 6 with different properties, it takes a certain amount of time for it to enter the soil pumping pipe 3, no matter how small the amount.
It is not possible to determine whether the injection amount of the viscosity imparting agent 5 is appropriate. For example, even when earth and sand 6 which is hard and has a large piping resistance and earth and sand 6 which is soft and has a small piping resistance are alternately pumped through the earth and sand pumping pipe 3, the detected value of the piping resistance remains constant.

The above adjustment method (3) adjusts the amount of viscosity imparting agent 5 to be injected by looking at the properties of the sediment 6 in the sediment storage tank 2, so the operator does not have to go to the sediment storage tank 2. Therefore, it should not be used in dangerous places such as narrow spaces or sites where methane gas is generated.
There is a problem that the scope of use is greatly limited.

The present invention aims to provide an earth and sand pumping device that improves the above-mentioned drawbacks.

"Means for Solving the Problems" The present invention provides means for detecting the sediment pressure in the soil pumping pipe at two locations near the soil storage tank of the soil pumping pipe, at a distance in the axial direction of the sand pumping pipe. It is characterized by being equipped with

"Function" The present invention detects the earth and sand pressure in the earth and sand transport pipe at two locations, detects a pressure loss based on the differential pressure between the detected earth and sand pressures, and supplies the earth and sand into the earth and sand tank based on the pressure loss. Adjust the injection amount of viscosity imparting agent.

"Example" Hereinafter, one example of the earth and sand pumping device of the present invention will be described as a first example.
This will be explained with reference to FIGS. 3 to 3.

In the figure, the same reference numerals as in FIG. 4 indicate the same parts.

Therefore, the earth and sand pumping device of the present invention in this embodiment has first earth pressure gauges 8 (strain gauges) installed at two locations near the earth and sand storage tank 2 of the earth and sand pumping pipe 3 to detect the earth and sand pressure inside the earth and sand pumping pipe 3. and a second earth pressure gauge 20 (strain gauge type) are installed at a distance Lm (any number of meters may be acceptable, but it is determined by considering the pumping distance) in the axial direction of the earth and sand pumping pipe 3. An amplifier 12 is installed in the earth and sand pumping pipe 3, and a calculation unit 21 and a meter 14 are installed near the injection device operation unit 11.
will be established. Cables 13 are connected between the first earth pressure gauge 8, the second earth pressure gauge 20, the amplifier 12, and the calculation section 21, respectively.

As shown in FIG. 2, the first earth pressure gauge 8 and the second earth pressure gauge 20 measure the earth pressures P _V1 and P _V2 that act perpendicularly to the inner wall of the earth and sand pumping pipe 3 at the locations where they are installed, respectively.
is detected and outputs the detection signal to the amplifier 12. The amplifier 12 inputs and amplifies the detection signals output from the first earth pressure gauge 8 and the second earth pressure gauge 20, and outputs the amplified detection signal to the calculation section 21. The calculation unit 21 inputs the detection signal amplified and outputted from the amplifier 12, calculates the pressure loss ΔP of the earth and sand 6 based on the detection signal using the following formula (1), and calculates the value of the calculated pressure loss ΔP on the meter. Output to 14. The meter 14 displays the value of pressure loss ΔP output from the calculation section 21.

Here, the earth and sand 6 pumped through the earth and sand pumping pipe 3 usually has an internal friction angle close to 0° and a cohesive force C [Kg/cm ² ]. Vertical pressure P _v and horizontal pressure acting on the inner wall of earth and sand pumping pipe 3 in this case
The relationship with P _H can be shown by the Mohr stress circle shown in FIG. At this time, the earth and sand pumping pipe 3
The pressure loss ΔP when the earth and sand 6 flows through the distance L (m) between the first earth pressure gauge 8 and the second earth pressure gauge 20 attached to the earth pressure gauge 8 and the second earth pressure gauge 20 can be expressed by the following formula (1).

ΔP=P _H1 −P _H2 =(P _V1 +2C)−(P _V2 +2C)=P _V1
-P _V2 ...(1) However, P _H1 : Horizontal earth pressure [Kg/cm ² ] at the point where the first earth pressure gauge 8 of the earth and sand pumping pipe 3 is attached P _H2 : The second earth pressure gauge 20 of the earth and sand pumping pipe 3 Horizontal earth pressure at the point where the first earth pressure gauge ₈ of the earth and sand pumping pipe 3 is installed [Kg/cm ² ] P _V2 : Vertical earth pressure at the point where the first earth pressure gauge 8 of ^the earth and sand pumping pipe 3 is installed 2 Vertical earth pressure at the location where the earth pressure gauge 20 is attached [Kg/cm ² ] As is clear from the above equation (1), the pressure loss ΔP can be expressed by the vertical earth pressures P _V1 and P _V2 . Therefore, the meter 14 includes a first earth pressure gauge 8 and a second earth pressure gauge 2.
The pressure loss ΔP calculated from the differential pressure of the earth and sand 6 detected at 0 is displayed.

The earth and sand pumping device of the present invention in this embodiment is as follows:
Since the configuration is as described above, based on the pressure loss ΔP displayed on the meter 14, the operator 15 calculates the maximum discharge force of the earth and sand pump 1>ΔP×l/L (where l is the total length of the earth and sand pump 3) The amount of viscosity imparting agent 5 to be injected is adjusted so that

As described above, the earth and sand pumping device of the present invention adjusts the injection amount of the viscosity imparting agent 5 based on the pressure loss ΔP determined from the vertical pressure difference detected at two locations of the earth and sand pumping pipe 3. Therefore, the injection amount of the viscosity imparting agent 5 can be adjusted accurately, and the earth and sand 6 can be pumped efficiently. Moreover, the pressure loss ΔP near the sediment storage tank 2
, the time delay is extremely small.
The amount of viscosity imparting agent 5 to be injected can be adjusted accurately. Further, since the injection device 11 and the meter 14 can be installed apart from the sediment storage tank 2, they are not limited to the site of use. Furthermore, since the injection amount of the viscosity imparting agent 5 is accurately adjusted and the soil 6 is pumped efficiently, extra capacity of the soil pump 1 is not required, and the soil has a capacity commensurate with the efficient pumping of the soil 6. It is only necessary to equip the pressure pump 1, and the cost can be reduced.

"Effects of the Invention" As is clear from the above examples, the earth and sand pumping device of the present invention can accurately adjust the injection amount of the viscosity imparting agent. As a result, the earth and sand can be pumped efficiently, and furthermore, post-processing work is not required or required. Furthermore, it is not limited to the place of use. Moreover, the cost is low.

[Brief explanation of drawings]

1 to 3 show an embodiment of the earth and sand pumping device of the present invention, FIG. 1 is a schematic diagram, FIG. 2 is an enlarged sectional view of the part shown in FIG. 1, and FIG. 3 is a stress circle of the mall. FIG. FIG. 4 is a schematic diagram showing a conventional earth and sand pumping device. 1... Sediment pressure pump, 2... Sediment storage tank, 3...
Earth and sand pumping pipe, 5... viscosity imparting agent, 6... earth and sand, 8
...First earth pressure gauge, 9... Injection pipe, 11... Injection device, 20... Second earth pressure gauge, 21... Arithmetic unit.

Claims (1)

[Claims] 1 comprising a sediment storage tank, a sediment pump disposed in the sediment storage tank, a sediment pumping pipe connected to the sediment storage tank, and a means for supplying a viscosity imparting agent communicated with the sediment storage tank, In the earth and sand pumping device for pumping and discharging the earth and sand in the earth and sand storage tank through the earth and sand pump through the earth and sand storage tank to a target location, the earth and sand pumping pipes are provided at two locations near the earth and sand storage tank. 1. An earth and sand pumping device, characterized in that a means for detecting the earth and sand pressure inside the earth and sand pumping pipe is equipped at a certain distance in the axial direction of the earth and sand pumping pipe.