JP3678445B2 - Additive supply and mixing method to earth and sand - Google Patents

Description

[0001]
[Industrial application fields]
TECHNICAL FIELD The present invention relates to a method for supplying and mixing additive materials to earth and sand to be fed and mixed with additive materials such as solidified material and foam beads to the earth and sand to be pumped.
[0002]
[Prior art]
Conventionally, when earth and sand such as soft mud are pumped to a landfill, the soft mud and solidified material are kneaded with a mixer and then pumped. Therefore, a mixer for mixing the soft mud and the solidified material is necessary, and the operation cost of the mixer is high and uneconomical.
On the other hand, when a viscous soil with a high water content ratio is sent using mixed air, such as soft mud like sand sent from a high-concentration dredger, etc., it is indicated by an arrow A with respect to the sediment S in the pipeline 1 in FIG. When the compressed air shown is supplied, earth and sand S accumulates in the lower part of the pipe 1 and the upper part of the accumulated earth and sand S undulates as shown in FIG. 8 from the state in which the compressed air A flows through the upper part of the pipe 1. Thus, as shown in FIG. 9, the earth and sand S block the inside of the pipe 1 and become plugged. As a result, the sediment S is pumped through the pipe 1 by the compressed air A, and again returns to a state close to that in FIG. 7, and the phenomenon shown in FIGS. 8 and 9 occurs and is repeated, as shown in FIG. Since S advances in the pipe line 1 while repeating the formation and collapse of the plug in the pipe line 1, the part where only air is sent and the part where the earth and sand S are sent pass alternately.
[0003]
Therefore, in order to supply an additive such as a solidifying agent only to the plug portion of the earth and sand sent through the mixed pressure feeding pipe as described above, the invention of JP-A-6-65948 relating to an additive supply device to the mixed pressure sand sending sand. However, even in this case, it is very difficult to reliably remove the plug portion and supply the additive only to the plug portion.
Therefore, if the present inventors supply an additive when generating a plug flow of earth and sand sent by mixed pressure, the earth and sand are kneaded by repeated formation and collapse of the plug flow during subsequent pumping. As a result of various considerations and experiments, focusing on the fact that they are mixed, the present invention has been achieved.
[0004]
[Problems to be solved by the invention]
The present invention has been made in order to solve the above-described conventional problems, and provides an additive supply and mixing method to earth and sand which is pumped while kneading the additives such as earth and sand without using a mixer. It is for the purpose.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the method for supplying and mixing additives to the earth and sand according to the present invention is to add the additives to the earth and sand supplied by the pump with the compressed air, disperse the additives, and add the compression. It consists of a method for supplying and mixing additive material to the earth and sand, in which the plug flow is generated by air and the earth and sand plug is repeatedly formed and collapsed to mix the earth and sand with the additive.
[0006]
【Example】
An embodiment of the present invention will be described below with reference to the drawings, but a layout diagram of a supply and mixing apparatus according to an embodiment for supplying and mixing an additive such as a solidified material to soft mud by the method of supplying and mixing an additive according to the present invention. Is shown in FIG.
First, reference numeral 10 in FIG. 1 denotes a tank having an open upper surface. The earth and sand S supplied from the tank 10 is a pump 2 capable of supplying earth and sand, such as a centrifugal pump, a displacement pump such as a piston pump and a screw pump, through a hopper. Is supplied to the transfer pipe 3 by the above.
[0007]
The transport pipe 3 is provided with a flow rate measuring device 4 and an electric valve 5, and an injection tube 7 for injecting an additive from the additive supply / mixing device 6 is connected downstream thereof.
A predetermined amount of additive material is injected from the supply and mixing device 6 together with the compressed air A to the earth and sand S in the conveying pipe 3 through the injection pipe 7, and the additive material is dispersed and added to the earth and sand S. Further, when the compressed air A is supplied, the earth and sand S generate a plug flow in the conveying pipe 3, and the compressed air is fed to the earth and sand S by being mixed-pressure-fed by the conveying pipe 3 while repeating the generation and collapse of the earth and sand plug. The additive injected together with A is kneaded with earth and sand S during pumping.
[0008]
The earth and sand S to which the additive is added is transported for a predetermined distance by the transport pipe 3 and discharged from the discharge end 13 of the transport pipe 3 to the disposal site 14 or the like.
Next, as shown in the side view of FIG. 2 and the plan view of FIG. 3, the additive supply / mixing device 6 drops the additive from a quantitative supply device including an additive material tank 14 and a meter 15 with a built-in rotary feeder. As shown in FIG. 6, the additive material is supplied into a cylinder 17 having two chambers for reciprocating two pistons 16. The supply amount of the additive is adjusted by the meter 15 according to the flow rate measured by the flow rate measuring device 4.
[0009]
The piston 16 is horizontally reciprocated by a hydraulic cylinder 18, and one of two compressed air supply ports 18 at the top of the cylinder 17 where the room is located when the piston 16 is moved to either the left or right side. Then, the additive material is injected together with the compressed air A, and the injection is continuously performed by the reciprocating motion of the piston 16.
An additive discharge port 19 is provided below each of the compressed air supply ports 18 and connected to the transfer tube 3 via the injection tube 7.
[0010]
Next, the connecting portion 20 from the injection tube 7 to the conveying tube 3 has a structure of a side sectional view of FIG. 4 and a perspective view in the XX direction of FIG. Is contained so that the additive does not adhere to the inner surface of the connecting portion 20, and a compressed air supply port 23 is also provided in the lower part of the inner surface of the transport pipe 3 so that the additive does not stay.
[0011]
【The invention's effect】
As described above, according to the method for supplying and mixing the additive to the earth and sand of the present invention, the additive is added and dispersed by jetting the compressed air when the plug flow for sending the earth and sand to the mixed pressure in the transport pipe is generated. By supplying the earth and sand and repeating the formation and collapse of the plug flow in the pipe, the earth and sand and the additive can be sufficiently mixed, and the additive and earth and sand are reliably and uniformly mixed.
Therefore, the installation of the mixer and the mixer work are not necessary, and the work cost and the equipment cost are reduced, which is economical.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a layout diagram of a supply device of an embodiment for supplying an additive to earth and sand by the method for supplying and mixing additive according to the present invention.
FIG. 2 is a side view of the feed mixing apparatus of FIG.
FIG. 3 is a plan view of FIG. 2;
4 is a side cross-sectional view of a connection portion to a conveying pipe of the supply and mixing apparatus of FIG. 2;
5 is a perspective view in the XX direction of FIG. 4. FIG.
6 is a side view showing the piston of FIG. 2. FIG.
FIG. 7 is an explanatory view showing a state in which compressed air is supplied to the earth and sand in the pipeline.
8 is an explanatory view showing a state in which the upper part of the earth and sand has undulated from the state of FIG.
FIG. 9 is an explanatory view showing a state in which earth and sand are plugged in the pipe from the state of FIG.
FIG. 10 is an explanatory view showing a plug state of earth and sand that is sent by mixed pressure by repeating the states of FIGS. 7 to 9;
[Explanation of symbols]
2 Pump A Compressed air S Sediment

Claims (1)

The additive material is injected into the earth and sand supplied by the pump with compressed air, and the additive material is dispersed and added, and a plug flow is generated by the compressed air, and the formation and collapse of the earth and sand plug is repeated. A method for supplying and mixing additive material to earth and sand in which the additive material is mixed.

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