JP3069976B2 - Method of kneading mixed pressure sand and solidifying agent - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for kneading earth and sand for sending earth and sand at a mixed pressure using compressed air and a solidifying agent for improving the soil quality.

[0002]

2. Description of the Related Art Heretofore, it has been practiced to knead earth and sand and a solidifying agent for improving soil quality in advance by kneading with a kneading device such as a mixer and to reclaim the land in a landfill. However, since a kneading device such as a mixer is used, there is a limit to kneading in a large amount, and there is a problem that the cost increases.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is possible to knead earth and sand with a solidifying agent without using a kneading device such as a mixer. It is an object of the present invention to provide a method that can be used.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a solidifying agent is supplied to sediment which is being pumped by a mixed pressure feed in which formation and collapse of a sediment plug are repeated, and the sediment pumped by the mixed pressure feed is used for forming the plug. in soil and kneading method solidifying agent and the the mixed pressure feed sediment kneading in conduit solidifying agent by repeating the formation and collapse and, detection of the plug of sediment formed in the conduit
Starts and stops the solidifying agent supply device according to the change in output value.
Aeration that supplies a solidifying agent at a fixed rate into the soil being pumped
It consists of a method of kneading pumped earth and solidifying agent .

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic side view showing a cross section of a main part of a solidifying agent supply device for a sediment pressure feeding pipe in one embodiment. And FIG. 2 is FIG.
2 is a plan sectional view taken along the line AA 'of FIG.
It is a front sectional view of B 'direction.

When a viscous soil having a high water content, for example, soft muddy soil sent from a high-concentration dredger is sent under mixed pressure, compressed air indicated by an arrow A is supplied to the soil S in the pipe line 3 shown in FIG. From the state where the sediment S accumulates at the lower part of the pipe 3 and the compressed air A flows over the upper part of the pipe 3 in FIG. Then, as shown in FIG. 7, the soil S blocks the inside of the pipeline 3 and becomes plugged. As a result, the soil S is compressed by the compressed air A into the pipeline 3.
8 and returns to a state close to that of FIG. 5 again, and the phenomena shown in FIGS.
As the soil S travels in the pipe 3 while repeatedly forming and collapsing plugs in the pipe 3, the portion where only air is sent and the portion where soil S is sent alternately. Will pass. Moreover, the length L of the plug of the earth and sand S is not constant.

Therefore, in FIG. 2, a swirl chamber 1 as shown in FIG. 3 is provided in the middle of a pipe 3 for feeding ooze-like earth and sand S under mixed pressure as shown in FIG. Centrifugal impeller 5
A submersible sand pump 2 including a drive motor 6 is provided, and a hopper 8 and a solidifying agent T for soil improvement are provided on the suction side of the submersible sand pump 2 via a check valve 7 as shown in FIG. A meter 9 for supply is connected, and the motor of the meter 9 is indicated by 10.

[0008] A silo 11 for supplying the solidifying agent T is provided on the measuring device 9, and a bag filter 12 is provided above the silo 11. Next, the spiral chamber 1 of the pipe 3
A flow meter 13 or a flow meter is provided in the pipe line 3 at a predetermined distance D from. Therefore, as described with reference to FIG. 8, the plug of the soil S sent under the mixed pressure is detected in the pipe 3 by a change in the detection value of the flow meter 13 or the flow meter, and the motor 10 of the measuring device 9 is detected.
To the detection signal G.

[0009] From a point in the conduit 3 where the flow meter 13 or the flow meter is provided to a point where the meter 9 for supplying the solidifying agent is provided.
Measure the time that the earth and sand plugs reach beforehand,
After a predetermined period of time has elapsed after receiving the detection signal G from the flow meter 13 or the flow meter, the measuring device 9 is operated to continuously supply the solidifying agent T into the hopper 8. Therefore, the supplied solidifying agent T
Is caused by the centrifugal force of the centrifugal impeller 5 rotating in the direction of arrow R.
It is supplied into the pipe 3 and does not blow out into the hopper 8 due to the centrifugal force of the centrifugal impeller 5.

Next, when the flow meter 13 or the flow meter detects that the plug of the earth and sand S has passed, the measuring device 9 is stopped after a predetermined time has elapsed, and the supply of the solidifying agent T is stopped. At this time, since nothing is supplied to the centrifugal impeller 5, the compressed air for pressure feeding in the pipeline 3 tries to blow out into the hopper 8, but the check valve 7 functions to blow out into the hopper 8. Can be prevented.

That is, by appropriately operating and stopping the measuring device 9 in accordance with a change in the detection value of the plug of the earth and sand S of the flow meter 13 or the flow meter provided in the pipeline 3, after supplying the solidifying agent T at a constant rate, solidifying agent T
Is fed through the pipeline 3 on the left side of FIG. 1 while the centrifugal impeller 5 is always rotated in the direction of arrow R.

Next, FIG. 4 shows that the solidifying agent T is added to the soft muddy soil S sent from the high-concentration dredger 15 through the pipeline 3 by the mixed pressure feeding method using the apparatus of the present invention, and the landfill is added. 16 shows a continuous processing system for discharging the solidifying agent T to the measuring device 9 of the solidifying agent supply device of the present invention shown in FIG. And adjusted by stopping.

Here, after adding the solidifying agent T, the soil S
The solidifying agent T is kneaded in the section of the conduit 3 indicated by P by plug flow mixing without providing a kneading means by repeating formation and collapse of the earth and sand plug. In some cases, an element of the static mixer 19 may be inserted near the discharge port in the pipeline 3. With such a system, the strength of the dredged sludge S, which is put into the landfill 16, is increased by the solidifying agent T , and the landfill can be used at an early stage.

[0014]

According to the present invention, the formation and collapse of earth and sand plugs
Repeatedly send the earth and sand mixed pressure, and
Active use of the behavior of repeated formation and collapse
Because the solidifying agent was kneaded evenly,
Eliminates the need for kneading means, thereby reducing costs
And there is no hindrance such as failure due to the installation of the kneading means.
Have a point . In addition, detection of earth and sand plugs installed in pipelines
Starts and stops the solidifying agent supply device according to the change in the value
By repeating the formation and collapse of sediment plugs,
Supply a solidifying agent at a certain rate
Can be done .

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a cross section of a main part of a device for supplying a solidifying agent to a sediment pressure pipe according to an embodiment of the present invention.

FIG. 2 is a plan sectional view taken along the line AA 'of FIG.

FIG. 3 is a front sectional view taken along the line BB ′ of FIG. 2;

FIG. 4 is a diagram showing a continuous processing system in which the apparatus of the present invention is employed in a pipeline for sending mixed pressure of ooze-like earth and sand from a dredger.

FIG. 5 is an explanatory diagram showing a state in which compressed air is supplied to earth and sand in a pipeline.

FIG. 6 is an explanatory view showing a state in which the upper portion of the earth and sand has waved from the state of FIG.

FIG. 7 is an explanatory view showing a state in which earth and sand are plugged in the pipe from the state of FIG. 6;

FIG. 8 is an explanatory diagram showing a state of a plug of earth and sand which is sent under mixed pressure by repeating the states of FIGS. 5 to 7;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Spiral chamber 2 Submersible sand pump 3 Pipe line 5 Centrifugal impeller 7 Check valve 9 Meter 13 Flowmeter 20 Solidifying agent supply device S Sediment T Solidifying agent

Claims (1)

(57) [Claims] 1. A method in which a solidifying agent is supplied to sediment that is being pumped by mixed-pressure feeding by repeating formation and collapse of a sediment plug, and the soil that is pumped by mixed-pressure feeding repeats formation and collapse of the sediment plug. Mixing pressure of soil and solidifying agent in a pipe
Solidifies in response to changes in the detected value of earth and sand plugs
Start and stop the dispensing device to keep a constant amount of
Mixing method of mixed pressure sand and solidifying agent to supply solidifying agent in proportion
Law .