JPH0411261B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibrating sieve for cleaning sand and gravel on the surface of which mud in the form of fresh concrete has adhered, and separating the sand and gravel from the mud.

In general, excavation shear that occurs in the mud shield method (also called the mud shield method) is a mix of highly concentrated mud that is forced into the face by an excavator and soil from the ground, and is discharged in the form of ready-mixed concrete. .
The empty space of this solid is filled with slurry, and the liquid pressure can be maintained inside the excavator, so when transporting it by car, it will be handled as a liquid and during transport. There was a risk that sludge would leak onto the roads, staining them, or splashing mud onto passersby, causing secondary pollution. Furthermore, muddy water containing bentonite and the like is difficult to dispose of at dump sites, is designated as industrial waste, and has drawbacks such as extremely high processing costs.

The present invention relates to the treatment of such a mixture of highly concentrated mud water and shear.The highly concentrated mud added during excavation is made by blending expensive bentonite, powdered clay, etc. The sand and gravel from which the mud has been removed by washing the shear with a small amount of water are separated from the muddy water, allowing the sand and gravel to be effectively used as an aggregate raw material. The purpose is to recover the separated muddy water so that it can be reused as much as possible.

In the first place, a mixture of highly concentrated mud, sand and gravel from the ground, and soil is in the form of ready-mixed concrete, and even if it is directly fed onto a sieve, the mud that has adhered to the surface cannot be removed. Even if large-sized gravel can be separated from sand, the mesh between sand and mud becomes clogged and cannot be separated.

In order to remove mud on the surface of the gravel of the present invention, efficiently separate sand from mud, and recover clay, bentonite, etc. at a high rate, sufficient frictional action between particles ( Since it is effective to use a mixture of not only gravel but also sand, we solved the problem by using part of the sieve as a cleaning chamber.

The present invention will be explained with reference to the drawings. In FIG. 1, 1 is the sieve body of the present invention, and 2 is a low-head vibrator. 3 is a pool provided at the shear input portion of the screen 6 for debris. Highly concentrated mud water transported from the excavation site and shear mixed with earth and sand are continuously injected into this area. 4 is a weir plate provided in the pool. 5 is a weir plate provided on the gravel screen 6. The mesh size of this gravel screen 6 is, for example, 15 mm. Reference numeral 7 denotes a screen for fine gravel, which is provided at the lower stage of the screen for fine gravel 6, and has a mesh opening of, for example, 2.5 mm. Each screen is installed almost horizontally. 8 is a washing water pipe for washing gravel;
9 is a cleaning water sprinkling pipe as well. Shear is supplied from the direction of arrow A.

That is, by vibrating the sieve body 1 in the direction of arrow F, the mixture of highly concentrated muddy water, sand and gravel from the ground, and soil is diluted with washing water in the input pool 3, and the vibrations cause particles to be separated from each other in the muddy water. Due to the frictional action of sand and gravel, the mud that has adhered to the inner surface of the gravel is removed. The sand, gravel and mud water separated from the fixed mud cross the weir 4 and move to the gravel screen 6.
The solid particles of the gravel are sized, and then sent to a screen 7 for granules, where the granules are further sized. The gravel and fine gravel are each discharged from one end of the screen. The separated muddy water and sand flow down from the gravel screen 7. The separated gravel and fine gravel are discharged in the direction of arrow B.

Sand and muddy water separated into coarse gravel and fine gravel by the sieve body 1 are received by a muddy water receiving trough 10 and then sent to a sand separator 11. As an example of this sand separator, in the sand separator 11, sand is scooped up from mud by a screw 12, and the sand is discharged from arrow C. The muddy water separated from the sand separator 11 overflows and is stored in the muddy water receiving tank 13, and the muddy water is further transferred to the muddy water circulation pump 1.
4 is circulated to the sieve body 1 via piping 9. The switching valve 16 is turned on during cleaning, and the switching valve 17 is turned on when collecting muddy water. Reference numeral 18 denotes a recovery mud water tank, and the mud water stored here is reused as recovery mud water as indicated by arrow D by a recovery mud water pump 19.

As explained above, in the present invention, gravel with fresh concrete-like mud adhered to the surface is thrown into a pool containing washing water before sieving, and is allowed to stay in the pool, using the vibration of the vibrating sieve. This has the effect of making it easier to sieve the dirt that adheres to the surface of the input materials with the washing water in the pool due to the mutual friction of the input materials, and to easily separate the sand, gravel, and mud into sand, gravel, and mud. .

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a vibration cleaning sieve device according to the present invention. 1... Sieve body, 2... Vibrating body, 3... Pool,
4, 5...Weir plate, 6...Screen for debris, 7...
...Gravel screen, 8, 9...Cleaning water pipe, 1
0...Mud water receiving gutter, 11...Sand separator, 12...Screw, 13...Mud water receiving tank, 14...Mud water circulation pump, 16, 17...Switching valve, 18...Recovery mud water tank, 19... pump.

Claims (1)

[Claims] 1 A plurality of weirs are installed on the uppermost gravel screen of the vibrating sieve body, one of which forms a pool where washing water for the raw material input section remains, and above the gravel screen and the pool, there is a washing drain, respectively. A water pipe is provided, and a screen for fine particles is installed almost horizontally at the bottom of the uppermost screen, so that the gravel and fine particles are discharged from one end of each screen and fall from each screen to the bottom of the vibrating sieve body. A muddy water receiving gutter is provided to receive sand and muddy water, and the sand and muddy water are fed into a sand separator disposed at one end of the muddy water receiving gutter, and the separated sand is discharged from the sand separator. The overflowing muddy water is stored in a muddy water receiving tank installed adjacently, and the muddy water is circulated through piping to the washing water pipe of the sieve body, and a part of the muddy water is stored in the recovery muddy water tank and used in the reuse mechanism. A vibrating sieve device designed to