JPS6168937A - Transportation of cohesive soil - Google Patents

Abstract

PURPOSE:To permit the transportation of cohesive soil in great amounts for long distances without occurrence of any trouble in treatment after the transportation by a method in which air bubbles are discharged into a soil transfer pipe before the transportation of the cohesive soil in such a way that the bubbles are adhered in a filmy state to the inner surface of the transfer pipe as the soil moves. CONSTITUTION:A foaming agent discharger 18 consisting of a tank 22 of a liquid 20 containing a foaming agent, a pump 24, a compressor 26, and a foaming device 30 is connected to a soil transport pipe 10 closely to a soil transfer pump 14. Before the transportation of cohesive soil, bubbles 28 are discharged from the device 30 into the pipe 10, and supplied into a ring 32 fixed to the pipe 10 through annularly drilled fine holes in the periphery of the pipe 10. Cohesive soil is then transfered under pressures by a transfer pump 14. As the soil moves, the bubbles 28 are adhered in the form of film over the whole length on the outlet side of the pipe 10, thereby giving a fluidity to the cohesive soil.

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a method for transferring clayey soil.

(Prior art and problems) Belt conveyors are commonly used as a method of transporting soil that has been excavated at civil engineering and construction sites, and belt conveyors are also used to transport highly cohesive clay. It is used.

However, such a transfer method using a belt conveyor not only requires a relatively large installation area, but also
If you want to use it in a curved area, you must install multiple short devices in combination, which requires additional installation space, making it extremely difficult to use in narrow spaces or on sites with curved areas. I was in a bad situation.

In order to solve these problems, methods have been proposed in which, for example, a pump is connected to a soil transport pipe and the cohesive soil is transferred using the pressure of the pump, or a method of transferring it by air. It had the following drawbacks.

In other words, since clay soil lacks fluidity, it is necessary to add water, bentonite, oil, etc. to pump it, and by adding these, the moisture content of clay soil increases and it becomes muddy. They are used to handling industrial waste, and there were problems with its disposal after transportation.

In addition, if the transfer path becomes long, it becomes difficult to pump the sediment using a single pump, so a large number of pumps must be installed in the middle of the earth and sand transport pipe, resulting in high installation and leakage costs.

Furthermore, pneumatic transport has disadvantages in that it is difficult to transport the product between people and that the pressure transport and storage equipment is bulky to ensure airtightness.

(Object of the invention) This invention was made in view of the above-mentioned conventional problems, and its purpose is to significantly improve the moisture content of cohesive soil, or to solve problems in disposal. To provide a method for transporting clayey soil, which is easy to dispose of after transport and is suitable for long-distance and large-scale transport.

(Structure of the Invention) In order to achieve the above object, the present invention provides a method for transferring cohesive soil from one end of a hollow cylindrical earth and sand transport pipe, in which an earth pressure pump is provided at one end of the earth and sand transport pipe to which the cohesive soil is supplied. At the same time, a foaming discharge device is connected to the earth and sand transport pipe in the vicinity of the upper sand pressure pump, and the bubbles discharged from this discharge device are supplied to the inner circumferential surface of the earth and sand transport pipe before the cohesive soil is transferred. After that, the soil is pumped into the transport pipe on a viscous surface, and as the soil moves on the viscous surface, the air bubbles are deposited in a film form over almost the entire length of the inner circumferential surface of the soil transport pipe. Features.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 show an embodiment of the viscous transfer method according to the present invention.

The transfer method shown in the figure is carried out using the apparatus shown below.

FIG. 1 is a schematic diagram of the overall configuration of the equipment, in which one end of a hollow cylindrical earth and sand transport pipe 10 is placed near an earth and sand excavation site for tunnel construction, for example, and after horizontally extending inside the tunnel. It extends vertically upwards, and the other end reaches the ground.

Connected to one end of the earth and sand transport pipe 10 is an earth and sand pressure pump 14 equipped with a part of a hopper into which clayey soil 11 having cohesive properties is introduced via a belt conveyor 12. A sand hopper 16 is installed to accommodate the transferred clayey soil 11.

Examples of the earth and sand pump 14 include a piston-type or squeeze-type concrete pump that pumps fresh concrete, or a Granbell pump.

Mono pumps are used.

A foaming agent discharge device 18 is connected to the earth and sand transport pipe 10 in the immediate vicinity of the earth and sand pressure pump 14 .

The foaming agent discharge device 18 is configured to eject a liquid 20 containing a foaming agent, for example, a protein-based foaming agent such as animal hydrolyzed protein,
A tank 22 containing a surfactant such as a higher alkyl ether sulfate dissolved in water, a pump 24 that pumps out the liquid 20 in the tank 22, a compressor 26, and the liquid 20 supplied by the pump 24 and the compressor. -26 compressed air to generate air bubbles 28, and the air bubbles 28 discharged from the foamer 30 are distributed around the outer periphery of the earth and sand transport pipe 10, as shown in FIG. The earth and sand transport pipe 1 is supplied into the fixed ring material 32.
It is sent into the inside of the container through a large number of minute holes 34 drilled in the hole.

Here, the micro holes 34 are annularly bored along the outer periphery of the earth and sand transport pipe 10 within the ring material 32, and
A plurality of strips are provided at predetermined intervals in the axial direction of the wire.

Note that the above-mentioned ring material 32 and through hole 34 are just one example of the means for supplying the bubbles 28 in an annular manner, and other methods such as directly attaching a jetting nozzle for the bubbles 28 in the circumferential direction of the transport pipe 10 and supplying the bubbles 28 in an annular manner are also possible. It may be a means of

The method for transporting the excavated clayey soil 11 is to first drive the foaming discharge device 18 before transporting it, and the bubbles 28 created by the foamer 30 are introduced into the soil transporting pipe 10 through the minute holes 34. It is supplied so as to form an annular shape around the circumference.

Next, a viscosity of ±11 is introduced into the earth and sand pumping bomb 14 via the conveyor 12, and the pump 14 is driven to force-feed this toward the other 9i side of the transport pipe 10. The clayey soil 11 sent into the transport pipe 10 is supplied with air bubbles 28 as described above, so that the air bubbles 28 extend to the other end of the transport pipe 10 as the clayey soil 11 moves. When the clayey soil 11 falls into the earth and sand hopper 16, a film of air bubbles 28 is formed covering the inner surface of the earth and sand transport pipe 1Q over almost the entire length of the earth and sand transport pipe 1Q. Then, after this, the foaming discharge device 1
While continuing the supply of air bubbles 28 from 8, the clayey soil 17 is sequentially transferred to the other end of the earth and sand transport pipe 10.

In the method for transferring cohesive soil formed in a groove as described above, since the viscosity of ±11 is pumped through the cylindrical soil transport pipe 10 by the pump 14, the structure is similar to the conventional transfer method using a conveyor.
There are almost no restrictions on location, and it can be used in narrow spaces or curved areas, and vertical transfer is also possible, eliminating the need for vertical transfer machines such as lifters and skips, dramatically increasing the degree of freedom. .

Further, unlike air transfer, there is no need to ensure airtightness, the equipment cost does not increase, and large-scale transfer can be easily handled by increasing the horsepower of the pressure pump 14.

Furthermore, the air bubbles 28 attached in a film form over almost the entire length of the sediment transport pipe 10 are interposed between the viscosity ±11 during transport, and the adhesion resistance is significantly reduced without increasing the water content of the sediment. Unlike conventional pump transfer, it does not impart fluidity and become difficult to handle after transfer, and it also reduces viscosity.
Since the air bubbles 28 attached to the soil 11 disappear in a short time in the soil hopper 16, the clay soil 11 after this is in almost the same state as when it was excavated, and will not be treated as industrial waste when transported or disposed of. .

Furthermore, as mentioned above, the viscous adhesion resistance during transfer is significantly reduced, so when using a pump with the same output, it is possible to transfer a longer distance than with conventional pump transfer.
Fewer bombs are required when transporting long distances.

FIG. 3 shows another embodiment of the invention, and only its features will be explained below.

That is, in this embodiment, a bubble injection pump 36 is installed between the foamer 30 and the ring material 32, and the pressure is slightly higher than the internal pressure when the clayey soil 11 is pumped into the earth and sand transport pipe 1o. Air bubbles 28 are supplied into the ring material 32.

Mind you in this way! Even if 2128 is supplied, the same effects as in the above embodiment can be obtained, and the bubbles 28 can be supplied more smoothly.

(Effects of the Invention) As described above in detail in the Examples, according to the viscous transfer method according to the present invention, there is no problem in disposing of highly cohesive clay soil after transfer. Benefits include being able to transport large quantities over long distances.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram showing one embodiment of the invention, FIG. 2 is a sectional view of a main part of FIG. 1, and FIG. 3 is an explanatory diagram showing another embodiment of the invention.

Claims (1)

[Claims] In a method for transferring cohesive soil from one end of a hollow cylindrical earth and sand transport pipe to the other end, an earth and sand pump is connected to one end of the earth and sand transport pipe to which the cohesive soil is supplied, and a A foaming discharge device is connected to the earth and sand transport pipe, and before the cohesive soil is transferred, bubbles discharged from the discharge device are annularly supplied to the inner peripheral surface of the earth and sand transport pipe. Transfer of cohesive soil, characterized in that as the cohesive soil moves, the air bubbles adhere in a film-like manner over almost the entire length of the inner circumferential surface of the soil transport pipe. Method.