JPH0672441B2 - Pneumatic feeding method of earth and sand - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention efficiently aggregates and conveys sediment by consolidating a plurality of sediment-conveying pipelines that convey compressed sediment with a compressed air. The present invention relates to a method for pneumatically feeding earth and sand.

[Conventional technology]

Conventionally, a method of sucking earth and sand together with water by a dredging pump or the like and transporting it to a destination through a pipeline has been widely used in dredging work and the like.

In this case, the diameter of the pipeline is determined so that the flow velocity required for the sediment to flow with water is obtained, and as a result,
When you try to transport the sediment from a plurality of pumps in a single conduit on the way, the diameter of the one conduit should be considered in consideration of the flow velocity when operating multiple pumps. Will be decided. Therefore, two series of sediment transport pipelines having respective pumps in pipeline ₁ of diameter D ₁ shown in FIG.
-In the case where the two pipelines 1 having a diameter D ₂ larger than the above diameter D ₁ shown in Fig. B are put together, one pump of the two pipelines 1 is stopped and only one pump is operated. when the flow velocity V ₂ of the inside pipe 2 combined into one is smaller than the line V ₁ of the first 4-a view, there is a problem that sand S can not be transported.

On the other hand, as a result of repeating various experiments, the inventors of the present invention paid attention to pressure-feeding the sediment in the pipeline by mixed air pressure using compressed air. As a result, the sediment S in the pipeline 3 shown in FIG. Against arrow A
When the compressed air shown in Fig. 2 is used for the pressure feeding, first, the earth and sand S are deposited in the lower portion of the pipeline 3 in Fig. 2-A, and the compressed air A is fed to the pipeline 3.
As shown in Fig. 2-B, the upper part of the accumulated sediment S begins to swell from the state of flowing over the upper part of the pipe, and then the sediment S blocks the inside of the pipeline 3 as shown in Fig. 2-C, As a result, the earth and sand S are pressure-fed in the pipe 3 by the compressed air A, and the state of FIG. 2-A is restored again, as shown in FIGS. 2-B and 2-C. It was confirmed that a phenomenon occurred and this was repeated, whereby the sediment S could be pumped.

Therefore, when the soil S is pumped by the compressed air A, the pressure of the compressed air A is constant and the diameter of the conduit 1 in FIG.
Even if D ₁ changes to the diameter D ₂ of the pipeline 2 in Fig. 3-B such that D ₁ <D ₂ , the interval at which the state in which the sediment S plugs the pipelines 1 and 2 occurs is H ₁ From H to H ₂ , it became clear that it is possible to transport the earth and sand S only by increasing as H ₁ <H ₂ .

From the above, a plurality of pumping pipelines for pumping the sand in the pipelines with compressed air are integrated into one pumping pipeline, and the diameters of the combined pipelines are pumped through the plurality of pumping pipelines. The present invention has been made paying attention to that the sediment can be transported even if one of the two pressure-feeding pipelines is operated and the other is stopped if it is determined according to the flow rate of the sediment. Is.

[Problems to be Solved by the Present Invention]

The present invention is made in order to solve the problem when transporting the above-mentioned conventional sediment along with water in a pipeline, and each pipeline for transporting sediment including a plurality of pumps is a single pipe. The problem to be solved is to provide a method for pneumatically feeding earth and sand that can be put together in a road.

[Means for Solving the Problems]

As means for solving the above-mentioned problems, the method for pneumatically feeding sediment according to the present invention is to connect a pressure-feeding pipeline via a check valve to the discharge side of a pump for feeding sand-sand, and supply compressed air to the pressure-feeding pipeline. A sediment supply unit is configured by connecting pipes via check valves, and a plurality of sediment supply units are installed. The feature is that sediment is pumped together in the pumping pipeline.

Further, another method is to connect the pressure-feeding pipeline to the discharge side of the soil-pressure pumping pump via a check valve, and to connect the compressed air supply pipe to the pressure-feeding pipeline to configure the soil-feeding unit. A plurality of sediment supply units are installed, and the pressure supply pipes of the plurality of sediment supply units are combined into a single pressure supply pipe with a larger diameter through separate check valves. It is characterized by being pumped.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a layout view of a pressure-feeding pipeline according to an embodiment for carrying out earth-sand transportation work by applying the air-pressure sand-air feeding method of the present invention.

First, in FIG. 1, a pump 7 such as a spiral pump is connected as a pressurizing impeller to the end of a screw conveyor 6 having a hopper 5 for introducing dredged sand S in the upper part, and the screw conveyor 6 and the pump 7 are driven. The generator 8 is connected.

Next, the pump 7 is connected to the pressure feeding pipe line 11 having the pipe diameter D _{1, and} the pressure feeding pipe line 11 is connected to the compressor 13 via the compressed air supply pipe 10 having the check valve 9 to transfer the earth and sand S to the compressed air. It constitutes the earth and sand supply unit 20 that is pumped by A.

Further, the check valve 9 is also provided between the pump 7 and the compressed air supply pipe 10.
To arrange.

A plurality of pressure-feeding pipelines 11 for feeding the sediment S in the pipeline with the compressed air A configured as described above, for example, two series in this embodiment, are provided, and these pressure-feeding pipelines 11 of the diameter D ₁ of the sediment supply unit 20 are provided. Pipe diameter D ₂
It is collected in one pressure feeding line 12.

Here, the pipe diameter D ₂ of the pressure-feeding conduit 12 is determined to be larger as D ₁ <D ₂ according to the flow rate when the plurality of pressure-feeding conduits 11 are operated, and the pressure-feeding conduit 12 also has a Check valve 9 if necessary
A compressor 13 is connected through an attached compressed air supply pipe 10.

As described above, when the sand S is pumped by the pneumatic pumping line in which the plurality of pumping lines 11 are combined into one pumping line 12,
Sediment S in the state shown in FIGS. 2-A to 2-C.
Is sent in the pressure-feeding pipeline 11, but the check valve 9 provided in the pressure-feeding pipeline 11 works even if the sediment S is plugged into the pressure-feeding pipeline 11 and the pressure in the pipeline rises. The pressure is applied only in the direction in which the sediment S is conveyed, and the sediment S is conveyed.

In addition, one of the pressure feeding lines 11 is stopped and the other pressure feeding line 11 is stopped.
The check valve 9 is arranged on the compressed air supply pipe 10 even when only the compressed air supply pipe 10 is operated, so that the sediment S does not enter the compressed air pipe 10.

A check valve 9 may be arranged in each of the pressure-feeding pipes 11 before the pressure-feeding pipes 11 having a plurality of pipe diameters D ₁ merge, and in this case, the check valve 9 of the compressed air supply pipe 10 may be arranged. Need not be provided.

〔The invention's effect〕

As described above, according to the method for pneumatically feeding sediment according to the present invention, the pressure-feeding pipelines of the plurality of sediment-supplying units are collectively pumped into one thick pressure-feeding pipeline having a larger pipe diameter to smoothly feed the sediment. Therefore, the facility cost and the operating cost are low, which is economical.

In each sediment supply unit, either the compressed air supply pipe is connected to the pressure feeding pipe via the check valve, or another check valve is connected before the pressure feeding pipes are combined into one thick pressure feeding pipe. As a result, when the operation of some of the sediment supply units is stopped, the sediment of other operating sediment supply units enters the pumping pipeline of the suspended sediment supply unit and clogs the compressed air supply pipe. It is possible to smoothly and continuously operate without causing any trouble to restart the next operation.

Further, when a centrifugal pump is used as the sediment pump, the sediment can be continuously discharged against the pressure of the compressed air with a simple structure, so that the equipment can be simplified and the equipment cost can be reduced.

[Brief description of drawings]

FIG. 1 is a layout view of a pressure-feeding pipeline according to an embodiment in which the method of pneumatically feeding earth-sand according to the present invention is applied to carry out earth-sand conveyance work.
A, FIG. 2-B, and FIG. 2-C are a series of explanatory views for explaining a situation in which compressed air is used to pump sand in the pipeline,
Figures A and 3-B are illustrations of the case where the pressure is constant and the pipe diameter is different in Fig. 2-C, and Figs. 4-A and 4-B are soil and sand carried with water in the conventional pipeline. FIG. 7 ... Pump, 9 ... Check valve, 10 ... Compressed air supply pipe,
11,12 ...... Pressure feeding pipeline, 20 ・ ・ ・ Sand and sand supply section, A ・ ・ ・ Compressed air, D ₁ , D ₂ …… Pipe diameter, S ・ ・ ・ Sand and sand.

Claims (3)

[Claims] Claim: What is claimed is: 1. A sediment supply unit is provided by connecting a pressure-feeding pipeline to the discharge side of a sediment-pressure pump via a check valve, and connecting a compressed air supply pipe to the pressure-feeding pipeline via a check valve. Configure and
A method for pneumatically feeding earth and sand, in which a plurality of the earth and sand supply units are installed, and the pressure-feeding pipelines of the plurality of earth and sand supply units are combined into a single pressure-feeding pipeline having a larger pipe diameter. 2. A sediment supply section is constructed by connecting a pressure-feeding pipeline to the discharge side of a sediment-pressure pump through a check valve, and connecting a compressed air supply pipe to the pressure-feeding pipeline. A plurality of parts are installed, and the pressure-feeding pipelines of the plurality of sediment-supplying sections are collectively pumped into a single pressure-feeding pipeline having a larger diameter via separate check valves. Pneumatic feeding method of earth and sand. 3. The method for pneumatically feeding earth and sand according to claim 1, wherein a centrifugal pump is used as the earth and sand pump.