JP5934574B2 - Fine aggregate dewatering system - Google Patents

Description

  The present invention relates to a fine aggregate dewatering system. Specifically, the present invention relates to a dewatering system for dewatering the surface water of fine aggregates used for ready-mixed concrete.

Conventionally, fine aggregate has been used for ready-mixed concrete, but since this fine aggregate contains a large amount of water by crushed stone and washing, the fine aggregate is dehydrated before being used for concrete. Yes. This is because if the surface water ratio of the fine aggregate is not constant, the unit water amount in the ready-mixed concrete will fluctuate, and the slump and concrete strength will also fluctuate, affecting the quality of the concrete.
As methods for dewatering fine aggregates, there are a natural drainage method and a forced drainage method using a well point, a centrifugal dehydrator, a sealed container or the like.

  In the natural drainage method, for example, an inclined surface is used as a temporary storage place for fine aggregate, and fine aggregate is deposited on the inclined surface. Then, inside the pile of fine aggregate that has accumulated, the surface water of the fine aggregate moves downward to reach the inclined surface, flows along this inclined surface, and is discharged outside the mountain.

  In the forced drainage method using a well point, a fine aggregate is deposited on a temporary storage site to form a mountain, and a riser pipe having a well point attached thereto is inserted into the mountain approximately vertically from above. Then, a vacuum pump is connected to the base end side of the riser pipe, and the vacuum pump is driven to suck water inside the mountain through the well point.

In the forced drainage method using a centrifugal dehydrator, fine aggregate is put into the centrifugal dehydrator and dehydrated by centrifugation (see Patent Document 1).
Further, in the forced drainage method using a sealed container, fine aggregate is put into the sealed container, and the inside of the container is depressurized to forcibly dehydrate (see Patent Document 2).

JP 2004-225279 A JP 2004-20512 A

However, the natural drainage method has a problem that dehydration takes time.
In addition, in the forced drainage method using well points, when a large amount of fine aggregate is dehydrated, the fine aggregate piles become large, making it difficult to suck water deeper than the surface of the pile. There was a problem.
Further, in the forced drainage method using a centrifugal dehydrator or a closed container, there is a problem that the equipment is increased in size and cost because fine aggregate needs to be put into the equipment.

  An object of the present invention is to provide a fine aggregate dewatering system capable of quickly dehydrating a large amount of fine aggregate at a low cost.

A fine aggregate dewatering system according to claim 1 (for example, a fine aggregate dewatering system described later) is a dewatering system for dewatering a fine aggregate, and is an inclined surface (for example, described later) inclined in one direction. Of the inclined surface 10), a gravel layer (for example, a gravel layer 20 described later) stacked on the inclined surface, and a water-permeable layer (for example, a water-permeable sheet 30 described later) stacked on the gravel layer. A suction tube (for example, a suction tube 40 described later) embedded in the gravel layer and extending in a substantially horizontal direction and having a plurality of through holes (for example, a suction hole 44 described later), and the suction tube And a suction device (for example, a suction device 50 to be described later) for suction through, and dewatering the fine aggregate by combining forced drainage with natural drainage .

According to this invention, the fine aggregate is deposited on the water permeable layer, and the suction device is driven. Then, since air is sucked through the suction pipe, the inside of the gravel layer is in a negative pressure state. Therefore, the surface water of the accumulated fine aggregate is rapidly moved downward by being sucked to the gravel layer side in a negative pressure state in addition to gravity.
The water that has moved downward is sucked and discharged by the suction device through the suction pipe in the gravel layer, but the water that has not been sucked by the suction device reaches the inclined surface through the water-permeable layer and gravel layer. Naturally discharged through the inclined surface.

In this way, by combining forced drainage with natural drainage, fine aggregate can be dehydrated more quickly than in the case of only natural drainage.
Further, by driving the suction device, the wide area inside the gravel layer is in a negative pressure state, and the surface water of the fine aggregate can be sucked downward and forcedly drained over the wide area.
Further, since the suction pipe is arranged in a substantially horizontal direction, it is not necessary to suck up the water in the suction pipe upward as in the prior art. Therefore, since it can be easily sucked by the suction device, it is not necessary to increase the size of the suction device, and the cost is reduced.
In addition, unlike the case of using a centrifugal dehydrator or a sealed container, it is not necessary to put fine aggregate into the device, so that a large amount of fine aggregate can be dehydrated.

Dehydration system of fine aggregate according to claim 2, wherein the water permeable layer, high water resistant sheet or mesh-like member der durable is, together are laid on the upper surface substantially horizontal gravel The suction pipe is provided with an annular outer pipe and a plurality of transfer pipes that are bridged between mutually facing portions of the outer pipe .

  According to this invention, a highly durable water-permeable sheet or mesh-like member was used as the water-permeable layer. Therefore, after dewatering the fine aggregate, when the fine aggregate is carried out by the wheel loader, even if the wheel loader runs on the water permeable sheet or mesh member, the water permeable sheet or mesh The member can be prevented from being damaged.

According to the present invention, by combining forced drainage with natural drainage, fine aggregate can be dehydrated more quickly than in the case of only natural drainage.
Further, by driving the suction device, the wide area inside the gravel layer is in a negative pressure state, and the surface water of the fine aggregate can be sucked downward and forcedly drained over the wide area. Further, since the suction pipe is arranged in a substantially horizontal direction, it is not necessary to suck up the water in the suction pipe upward as in the prior art. Therefore, since it can be easily sucked by the suction device, it is not necessary to increase the size of the suction device, and the cost is reduced.
In addition, unlike the case of using a centrifugal dehydrator or a sealed container, it is not necessary to put fine aggregate into the device, so that a large amount of fine aggregate can be dehydrated.

1 is a longitudinal sectional view of a fine aggregate dewatering system according to an embodiment of the present invention. It is a top view which shows arrangement | positioning of the suction pipe of the dehydration system of the fine aggregate which concerns on the said embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a fine aggregate dewatering system 1 according to an embodiment of the present invention.

The fine aggregate dewatering system 1 dehydrates the surface water of the fine aggregate. The fine aggregate dewatering system 1 includes an inclined surface 10 having low water permeability and inclined in one direction, a gravel layer 20 stacked on the inclined surface 10 and having a substantially horizontal upper surface, and an upper surface of the gravel layer 20. A highly permeable water permeable sheet 30 as a water permeable layer laid on the surface, a suction pipe 40 embedded in the gravel layer 20 and extending in a substantially horizontal direction, and a suction device 50 for sucking moisture through the suction pipe 40 .
A fine aggregate is deposited on the water permeable sheet 30 to form a mountain 60.

FIG. 2 is a plan view showing the arrangement of the suction tubes.
The suction pipe 40 is a nylon tube, and includes an annular outer peripheral pipe 41 and a plurality of transfer pipes 42 that are stretched over portions of the outer peripheral pipe 41 facing each other.
The outer peripheral pipe 41 is disposed so as to be located immediately below the fine aggregate crest 60, and the outer peripheral pipe 41 and the transfer pipe 42 are connected by a T-shaped tube joint 43.

A plurality of suction holes 44 as through holes are formed in the outer peripheral pipe 41 and the transfer pipe 42.
The suction device 50 is a well point pump that collects and drains water by a vacuum force, and is connected to the outer peripheral pipe 41 via a tube joint 43.

The fine aggregate dewatering system 1 dehydrates the surface water of the fine aggregate as follows.
First, a fine aggregate is deposited on the water permeable layer to form a mountain 60, and the suction device 50 is driven. Then, since air is sucked from the suction hole 44 through the suction tube 40 by the suction device 50, a wide area inside the gravel layer 20 is in a negative pressure state. Therefore, as shown by the arrow in FIG. 1, the accumulated fine aggregate mountain 60 surface water 61 is rapidly drawn downward by being sucked to the gravel layer 20 side in a negative pressure state in addition to gravity. To do.
The water moved downward is sucked into the suction device 50 through the suction pipe 40 in the gravel layer 20 and discharged. On the other hand, the water that has not been sucked into the suction device 50 passes through the water-permeable sheet 30 and the gravel layer 20, reaches the inclined surface 10, flows through the inclined surface 10, and is naturally discharged.

According to this embodiment, there are the following effects.
(1) By combining forced drainage with natural drainage, fine aggregate can be dehydrated more quickly than when only natural drainage is used.
Moreover, since the wide area inside the gravel layer 20 becomes a negative pressure state by driving the suction device 50, the surface water 61 of the fine aggregate can be sucked downward and forcedly drained over the wide area.
Further, since the suction pipe 40 is arranged in a substantially horizontal direction, it is not necessary to suck up the water in the suction pipe upward as in the conventional case. Therefore, since it can be easily sucked by the suction device 50, it is not necessary to increase the size of the suction device 50, and the cost is reduced.
In addition, unlike the case of using a centrifugal dehydrator or a sealed container, it is not necessary to put fine aggregate into the device, so that a large amount of fine aggregate can be dehydrated.

  (2) Since the highly permeable water permeable sheet 30 is used as the water permeable layer, after the fine aggregate is dehydrated, the fine aggregate is carried out from the water permeable sheet 30 with a wheel loader. Even if the wheel loader travels, the water permeable sheet 30 can be prevented from being damaged.

It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.
For example, in this embodiment, although the water-permeable sheet 30 was used as a water-permeable layer, it is not restricted to this, You may use the mesh-shaped member and the plate-shaped member excellent in water permeability.
In the present embodiment, the inclined surface 10 is inclined in one direction. However, the present invention is not limited to this, and the inclined surface may have a mountain shape whose central portion is higher than the peripheral portion.

DESCRIPTION OF SYMBOLS 1 ... Fine aggregate dehydration system 10 ... Inclined surface 20 ... Gravel layer 30 ... Water-permeable sheet (water-permeable layer)
DESCRIPTION OF SYMBOLS 40 ... Suction pipe 41 ... Outer peripheral pipe 42 ... Overhead pipe 43 ... Tube joint 44 ... Suction hole (through hole)
50 ... suction device 60 ... mountain

Claims (2)

A dehydration system for dewatering fine aggregates,
An inclined surface inclined in one direction ;
A gravel layer stacked on the inclined surface;
A water permeable layer laminated on the gravel layer;
A suction pipe embedded in the gravel layer and extending in a substantially horizontal direction and having a plurality of through holes;
A suction device for sucking through the suction tube ,
A fine aggregate dewatering system that dehydrates fine aggregate by combining forced drainage with natural drainage . The aquifer is higher permeability sheet or mesh-like member der durable is, together are laid on the upper surface substantially horizontal gravel,
2. The dewatering of fine aggregate according to claim 1, wherein the suction pipe includes an annular outer peripheral pipe and a plurality of spanning ridges that are spanned between portions of the outer peripheral pipe facing each other. system.

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