JPS6352182B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for preventing excavated clay soil from adhering to equipment, containers, etc. when transporting or temporarily storing it.

Traditionally, clay soil excavated at civil engineering and construction sites is
Usually, the waste is transferred using a transfer device such as a belt conveyor, slider, tray lifter, etc., temporarily stored in a container such as a hopper, and then disposed of by dumping or the like.

However, because cohesive soil has strong cohesive and adhesive properties, cohesive soil lumps bind to each other in the form of nodules, and easily adhere to the conveyor surface, tray surface, etc. of the above-mentioned transfer device, and the wall surface of the storage container. Once adhered, it is difficult to remove it, resulting in a problem of extremely low transfer or storage efficiency.

For this reason, attempts have been made to solve the above problem by fluidizing the clay soil to some extent by mixing it with muddy water, oil, etc.; Although the adhesion of soil can be prevented to some extent, it has the disadvantage that subsequent handling is troublesome and it causes a new problem of environmental pollution during final disposal.

This invention was made in view of the problems of the conventional method of preventing adhesion of clayey soil as described above.
The purpose is to provide a method for preventing adhesion of cohesive soil that can increase the transfer or storage efficiency of cohesive soil with a relatively simple configuration, and that will not cause environmental pollution even during final disposal. It's there.

In order to achieve this object, the present invention provides a method for preventing the adhesion of clayey soil by foaming and supplying a liquid containing a foaming agent to the contact surface between the clayey soil and either a transfer device or a storage container. After
This method is characterized in that the above-mentioned clayey soil is supplied and bubbles are interposed in the mutual contact surfaces to prevent mutual adhesion.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 and 2 show an embodiment of the method for preventing adhesion of clayey soil according to the present invention.

The adhesion prevention method shown in the figure involves transporting clay 10 excavated at an underground excavation site using a slurry trolley 12, charging it onto a screw feeder 14, and then using this screw feeder 14 as well. 1
supported by a plurality of chains 18 wound around 6,
Trays 20 with open tops are arranged in a chain, and the clay soil 10 is sequentially accommodated and transferred into the trays 20 of a tray lifter 22 that has an approximately S-shape as a whole. Hopper 24
This shows a system applied to a transfer/storage system that temporarily stores the material inside the container and then transports it.

The method for preventing adhesion of clayey soil shown in the same figure is as follows:
This method has the following features compared to conventional methods.

That is, an elongated foam blowing pipe 26 is provided between the screw feeder 14 and the tray lifter 22, and a pump 28 blows the screw feeder 14 into the tray 20 of the tray lifter 22. Before the above-mentioned clay soil 10 is supplied, a liquid containing a foaming agent is foamed and supplied so that the foam adheres to the entire inner surface of the tray 20.

Therefore, after this, the clay soil 10 is placed in the tray 20.
When the screw feeder 14 feeds the inside,
The bubbles are present on all contact surfaces between the clayey soil 10 and the tray 20, completely preventing the clayey soil 10 from adhering to the inner surface of the tray 20.
After the clay 10 is raised and put into the hopper 24, the clay 10 does not adhere to and remain in the tray 20, and the transfer of the clay 10 can be carried out extremely smoothly and efficiently. can.

The foam supplied in advance to the contact surface between the clayey soil 10 and the tray 20 is foamed with air and a liquid in which a foaming agent such as animal hydrolyzed protein or a surfactant is dissolved. The amount of foam that adheres to clayey soil is relatively small, and it disappears after a certain amount of time, but even if the foaming agent remains, it does not cause environmental pollution and is a problem during final processing. It won't happen.

By the way, as mentioned above, the above-mentioned foam, which exhibits a remarkable effect in preventing the adhesion of the cohesive soil 10, is for example
When 0 is dropped and supplied onto the tray 20, clayey soil 10
It may be thought that all of the bubbles are destroyed by the impact when they collide with the inner surface of the tray 20, but although the bubbles are somewhat destroyed by this collision, they are not completely destroyed and are also attached to the cohesive soil 10 side. Therefore, there is no risk that the above-mentioned adhesion prevention effect will be lost.

In this case, it is desirable to supply the foam in the form of a relatively small particle size in the form of a mist, since there is less risk of the foam being destroyed by the impact as described above.

In addition, in the above embodiment, a case was shown in which foam was supplied to the tray 20 of the tray lifter 22, but foam was applied to the inner surfaces of the slurry trowel 12 and the hopper 24 in advance before the clay soil 10 was supplied. Of course, it is also possible to foam and supply the
It is also possible to prevent the sticky soil 10 from adhering to the surface.

Further, the foam can also be supplied to the clay soil 10, and in this case, the clay soil 10 can also be supplied to the slurry 12, tray 20, and hopper 24.
can be prevented from adhering to the surface.

As described above, when transferring and storing cohesive soil, the present invention is capable of foaming and supplying a liquid containing a foaming agent to the contact surface of either the transfer device or the storage container and the cohesive soil so that the clay adheres to the cohesive soil. After that, the clay soil is supplied to the transfer device and the storage container, and bubbles are interposed on the mutual contact surfaces to prevent mutual adhesion.This method prevents contamination of the surrounding environment when disposing of the clay soil. Therefore, it is possible to efficiently transport or store clay soil.

[Brief explanation of the drawing]

1 and 2 show one embodiment of the present invention, FIG. 1 is an explanatory diagram when the present invention is applied to a tray lifter, and FIG. 2 is an enlarged view of the line A in FIG. 1. It is. 10... Clayey soil, 12... Zuritoro, 14...
Screw feeder, 16...Rotating drum, 18
... Chain, 20 ... Tray, 22 ... Tray lifter, 24 ... Hopper, 26 ... Foam blowing pipe, 28 ... Pump.

Claims (1)

[Claims] 1. Transfer speed when excavated clay soil is transferred to a predetermined location using a transfer device such as a tray lifter, slider, or conveyor, or when temporarily stored in a container such as a hopper. After foaming and supplying a liquid containing a foaming agent to the contact surface of either the device or the container and the clayey soil, the clayey soil is supplied to the transfer device or the container and the clay is bonded to the contact surface of the clayey soil. A method for preventing adhesion of cohesive soil, characterized in that mutual adhesion is prevented by interposing the bubbles on the contact surfaces of the two. 2. A method for preventing adhesion of cohesive soil according to claim 1, characterized in that the liquid is sprayed onto a contact surface of the transfer device or the container.