JPH03169925A - Pneumatic conveying method for soil - Google Patents

Abstract

PURPOSE:To reduce an investment cost of a pipe line and an operation cost for the installation, by conveying soil with a pneumatic pressure through one conveying pipe, integrated from a plurality of pipes connected to a compressor through compressed air pipes having check valves, in pneumatic conveying pipes. CONSTITUTION:A pump 7 and a pneumatic conveying pipe 11 are connected at the end of a screw conveyor 6 and the pneumatic conveying pipe 11 is connected to a compressor 13 through a compressed air pipe 10 having a check valve 9. When soil S is conveyed with the compressed air through one pneumatic conveying pipe 12 integrated from such a plurality of pneumatic conveying pipes 11, even the pressure within the pipes increase, the check valve equipped in the pneumatic conveying pipe 11 works to act pressure only in the direction to convey the soil S to transfer the soil. Even when transferred only by one of the pneumatic conveying pipe, the soil S is prevented from entering the compressed air pipe 10 by the check valve 9. In this way, the invest cost of the pipe line and installation cost can be reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention efficiently pumps earth and sand by combining a plurality of earth and sand transport pipes into one, which pump earth and sand in the pipes with compressed air. This relates to a method of pneumatically transporting earth and sand.

[Conventional technology]

BACKGROUND ART Conventionally, a method widely used in dredging work, etc., is to suck up earth and sand together with water using a dredging pump or the like, and then transport the earth and sand to a destination via a pipeline.

In this case, the diameter of the pipe is determined to be large enough to obtain the flow velocity necessary for the sediment to flow with the water, and as a result,
When pipes from multiple pumps are combined into a single pipe midway to transport soil, the diameter of the combined pipe must be determined by taking into account the flow velocity when operating multiple pumps. It is determined by Therefore, two series of earth and sand transport pipelines each having a pump are installed in the pipeline 1 having a diameter DI shown in Figure 4-A, and one series having a diameter D2 larger than the above-mentioned diameter D+ shown in Figure 4-B. When the two pipes 1 are combined into one pipe 2, when one pump in the two pipes 1 is stopped and only one pump is operated, the flow velocity Vg in the pipe 2 combined into one pipe is 4th. There was a problem that the pipe was smaller than pipe ■1 in Figure -A, and the soil S could no longer be transported.

On the other hand, the present inventors focused on pumping the earth and sand in the pipe by mixed pressure using compressed air, and as a result of repeated various experiments, they found that the earth and sand in the pipe 3 shown in Fig. 2-A against arrow A
When pressure feeding is performed using compressed air as shown in Figure 2-A, soil S is deposited at the bottom of pipe 3 in Figure 2-A, and compressed air A flows through pipe 3.
As shown in Figure 2-B, the upper part of the accumulated sediment S begins to ripple, and then, as shown in Figure 2-C, the sediment S blocks the inside of the pipe 3, causing the plug to open. As a result, the soil S is forced into the pipe 3 by the compressed air A, and the state returns to the state shown in Fig. 2-A, as shown in Figs. 21B and 2-C. This phenomenon occurred and was repeated, and it was confirmed that this made it possible to pump the earth and sand S.

Therefore, when the earth and sand S are pumped by the compressed air A, the pressure of the compressed air A is constant and the diameter of the pipe line 1 in Fig. 3 is D.
Even if D. It has been found that it is possible to transport the earth and sand S simply by increasing Hl < Hz from H2 to H2.

From the above, multiple pressure-feeding pipelines that use compressed air to forcefully transport soil within the pipelines are combined into a single pressure-feeding pipeline, and the diameter of the combined pipeline is adjusted to force the soil through the multiple pressure-feeding pipelines. The present invention was developed by focusing on the fact that, if the flow rate is determined according to the flow rate of the earth and sand, it is possible to transport the earth and sand even when, for example, one of two pressure-feeding pipelines is operated and the other is stopped. It is.

[Problem to be solved by the invention]

The present invention was made in order to solve the above-mentioned conventional problems in transporting earth and sand together with water in a pipe, and it is possible to convert each earth and sand transport pipe having a plurality of bombs into a single pipe. The problem to be solved is to provide a pneumatic transportation method for soil that can be collected into roads.

[Means for Solving the Problems] As a means for solving the above-mentioned problems, the pneumatic transportation method for earth and sand of the present invention uses compressed air from a compressor or the like to move the earth and sand in the pipes sent by the pump. This method is characterized in that a plurality of pressure-feeding pipelines are combined into a single pressure-feeding pipeline having a larger pipe diameter than these pipelines, and earth and sand are pumped.

In addition, it is preferable that the earth and sand sent by bomb to each of the plurality of pressure-feeding pipes mentioned above is forced to be fed by compressed air via a check valve. Earth and sand can be pumped inside.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.
The figure is a layout diagram of a pressure-feeding conduit in an embodiment in which the pneumatic transport method of earth and sand of the present invention is applied to carry out a work of transporting earth and sand.

First, in FIG. 1, a pump 7 such as a spiral bomb is connected as a pressurizing impeller to the end of a screw conveyor 6 which has a hopper 5 at the top for charging dredged earth and sand, and the screw conveyor 6 and the pump 7 are connected to each other. A generator 8 for driving is connected.

Next, the pump 7 is connected to a pressure feed line 11 having a pipe diameter DI, and the pressure feed line 11 is connected to the compressor 13 via a compressed air supply pipe 10 having a check valve 9.

Further, a check valve 9 is also provided between the bomb 7 and the compressed air supply pipe 10.

A plurality of pressure-feeding pipes 11, for example, two lines in this embodiment, are provided to force-feed earth and sand Sf inside the pipes with the compressed air A having the above configuration, and these pressure-feeding pipes 11 with a pipe diameter of D2 are connected to each other. are combined into one pressure-feeding pipe 12.

Here, the pipe diameter D2 of the pressure-feeding pipeline 12 is equal to the diameter D2 of the pressure-feeding pipeline 12.
Depending on the flow rate when the compressor 1 is operated, D1<Dz is determined, and the compressor is Connect 13.

As described above, a plurality of pressure-feeding pipes 11 are combined into one pressure-feeding pipe 1.
When the earth and sand S are forced to be conveyed through the pneumatic conveyance pipes summarized in 2, the earth and sand S are sent through the pressure conveyance pipe 11 in the state shown in FIGS. 2-A to 2-C, but the earth and sand S are Even if the pressure feed pipe 11 is plugged and the pressure inside the pipe increases, the check valve 9 provided in the pressure feed pipe 11 operates, and pressure is applied only in the direction of transporting the earth and sand. S is transported.

Furthermore, even if one of the pressure-feeding pipelines 11 is stopped and only the other pressure-feeding pipeline 11 is operated, the compressed air supply pipe 10 is provided with a check valve 9, so that the earth and sand S are not supplied with the compressed air. It does not enter the pipe 10.

Note that before the plurality of pressurized pipelines 11 having pipe diameters D1 join together,
A check valve 9 may be arranged in each pressure feed pipe 11, and in this case, the check valve 9 of the compressed air supply pipe 10 does not need to be provided.

〔Effect of the invention〕

As explained above, according to the pneumatic transport method for earth and sand of the present invention, even if the earth and sand from a plurality of pressure pipes are combined into one pressure pipe, the earth and sand can be smoothly transported by pressure transport, so that This has the effect of being economical since equipment costs and installation work costs are low.

[Brief explanation of the drawing]

Fig. 1 is a layout diagram of a pressure conveyance pipe in an embodiment in which the earth and sand pneumatic conveyance method of the present invention is applied to carry out earth and sand transportation work, and Fig. 2-
Figure A, Figure 2-B, and Figure 2-C are a series of explanatory diagrams explaining the situation in which earth and sand are pumped through a pipe with compressed air, and Figure 3-
Figure A and Figure 3-B are explanatory diagrams of Figure 2-C when the pressure is constant and the pipe diameter is different, and Figures 4-A and 4-B are illustrations of the case where soil and sand are transported together with water in the conventional pipe line. FIG. 7... Bomb, 9... Check valve, 10... Compressed air supply pipe, 11.12... Pressure feeding pipe line, A... Compressed air, D. ,D. ... Pipe diameter, S... Sediment.

Claims (1)

[Scope of Claims] 1. Sediment in which a plurality of pressure-feeding pipes, in which the earth and sand in the pipes are pumped using compressed air, are combined into a single pressure-feeding pipe with a larger pipe diameter, and the earth and sand is pumped through the pipes. pneumatic feeding method. 2. The pneumatic transport method for earth and sand according to claim 1, wherein the earth and sand in the pipe is pumped by compressed air through a check valve.