JP2013022832A - Device and method for reducing surface water of fine aggregate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently reduce the surface water of a fine aggregate (a) by a simple device.SOLUTION: The descending of the surface water of a fine aggregate (a) is achieved by putting insertion suction pipes 3 connected with heads of vacuum pumps 2 into the fine aggregate (a) piled on a stock bed 1. Simultaneously, draining is also performed through strainers 51 at tips of buried pipes 5 buried under the stock bed 1.

Description

The present invention relates to a surface water lowering device and a lowering method for fine aggregates.

Kneaded concrete used in dams is concrete with a small amount of water.
Therefore, it is necessary to use a fine aggregate with a low water content as the fine aggregate constituting the concrete, and the moisture contained in the fine aggregate manufactured at the aggregate plant is removed and adjusted to a predetermined surface water ratio. Must.
As such a draining process, conventionally, as shown in FIG. 4, a method of temporarily placing fine aggregate a in a yard with an inclination on a concrete floor b and allowing natural flow over a surrounding groove c over time. Is adopted.

However, the conventional fine aggregate surface water lowering method as described above has the following problems.
<1> Since only waiting for the phenomenon that the water on the surface of the fine aggregates naturally flows down, the temporary storage time is long, which causes the subsequent process to be delayed.
<2> Temporary placement takes time, so a large temporary storage place is required, and a large amount of capital investment is required, such as securing the site, leveling, and installing a roof that covers the entire area.
<3> Natural drainage varies greatly depending on weather conditions such as temperature, humidity, and wind power, and the evaporation effect is low when the temperature is low.
<4> Since not only water but also sand flows out together with natural drainage, the sand flows into the drainage groove, which causes the drainage function to deteriorate.
<5> Cleaning the drainage ditch is an indispensable task, all of which is manual work, and therefore the work efficiency is poor, and the drainage time becomes longer.

In order to solve the problems as described above, the surface water lowering device for fine aggregate of the present invention is connected to a stock floor covered with a roof, a vacuum pump, a water absorption hose connected to the vacuum pump, and a tip of the water absorption hose. It is characterized by comprising the inserted water absorption pipe, the buried pipe installed in the lower part of the stock floor, and the strainer attached to the tip of the buried pipe.
Moreover, the surface water lowering method of the fine aggregate according to the present invention uses the above-described apparatus, and is connected to a vacuum pump through a water absorption pipe inserted into the fine aggregate loaded on the stock floor and a strainer installed at the bottom of the stock floor. It is characterized by draining by.

Since the fine aggregate surface water reducing device and the reducing method of the present invention are as described above, the following effects can be obtained.
<1> Since the drainage of fine aggregate, which has depended on natural phenomena, is forcibly performed by absorbing water from the water inlet pipe, the time for draining can be greatly reduced. Therefore, the production amount of concrete can be increased.
<2> As a result of an increase in the amount of concrete produced, high-speed construction such as dams using hard concrete such as the RCD method, and improvement of the production volume can be achieved.
<3> Since the draining cycle is shortened, a small temporary storage space is sufficient, the leveling work is simplified, and the construction area of the roof can be reduced.
<4> Since drainage does not depend on natural phenomena, the clogging of the drainage channel is unlikely to occur, and there is no need for manual cleaning of the drainage channel, so that maintenance costs can be greatly reduced.
<5> For example, if a large-scale facility such as a muddy water treatment facility, a dewatering screen, or a sand stabilizer is installed, it is possible to drain water at a high speed. However, in that case, not only the amount of capital investment is increased, but also the amount of power during operation and the disposal of a large amount of foundation concrete at the time of withdrawal are required. In that respect, since the apparatus and method of the present invention only use a simple pump and a water inlet pipe, its installation and movement are simple and extremely economical.

Explanatory drawing of the surface water reduction apparatus of the fine aggregate of this invention. Explanatory drawing from the plane. Explanatory drawing of the example of arrangement | positioning of an actual insertion water absorption pipe. Explanatory drawing of the example of the conventional natural draining.

  Hereinafter, an embodiment of a surface water lowering device for fine aggregate according to the present invention will be described with reference to the drawings.

<1> Overall Configuration The apparatus of the present invention includes a stock floor 1 covered with a roof, a vacuum pump 2, a water absorption hose 31 connected to the vacuum pump 2, and a water absorption pipe 3 connected to the tip of the water absorption hose 31. Consists of.

<2> Stock floor This is a concrete floor for stocking fine aggregates.
In order to make use of natural flow, it is possible to provide a slope from the center to the mountain or to the whole in one direction.

<3> Roof In order to prevent rain from hitting the fine aggregate that has been stocked, a support column 41 is provided around the stock floor 1, and a roof 4 is provided on the support 41 to cover the entire stock floor 1 with the roof 4.
In general, a belt conveyor 42 is installed on the roof 4, and a fine aggregate manufactured in an aggregate plant is dropped from a discharge port and loaded on the stock floor 1.

<4> Vacuum pump The vacuum pump 2 is installed in the vicinity of the stock floor 1 or in a range where a water absorption hose 31 described later can reach.
This vacuum pump 2 is commercially available. For example, many of them are commercially available that are lightweight and equipped with a trolley and can be operated at 100 V, but a stationary type can also be used.
One end of a water absorption hose 31 is connected to the vacuum pump 2.
The water absorption hose 31 is a general commercially available hose.
For the sake of simplicity, FIG. 1 shows a state in which one water absorption hose 31 is connected to one vacuum pump 2. However, as shown in the plan view of FIG. A plurality of water absorption hoses 31 can be connected.

<5> Insertion water absorption pipe The insertion water absorption pipe 3 is connected to each other end of the plurality of water absorption hoses 31.
This insertion water absorption pipe 3 is a cylindrical body having a large number of small-diameter holes, which is also commercially available.
If the diameter of the hole is smaller than the particle size of the fine aggregate, only the surface water can be sucked without sucking the fine aggregate.
If the valve 32 is interposed between the water absorption pipe 3 and the vacuum pump 2, the suction action at the hose 31 that has completed water absorption can be closed.
Since the apparatus of the present invention is constituted by the simple equipment and parts as described above, installation, maintenance, and removal are simple and extremely economical.

<6> Surface Water Reduction Method A method for reducing the surface water of the fine aggregate a using the above apparatus will be described.
First, the fine aggregate a discharged from the discharge port 43 of the belt conveyor 42 is loaded on the stock floor 1 and formed in a mountain shape.

<7> Insertion of insertion water absorption pipe Insert the insertion water absorption pipe 3 at the tip of the vacuum pump 2 from different directions into the hillside of the fine aggregate a until the small diameter hole is located inside the fine aggregate a. To do.
Then, the vacuum pump 2 is driven.
As a result, only the surface water of the fine aggregate a can be absorbed from a large number of small-diameter holes of the large number of insertion water-absorbing tubes 3.
The absorbed water is drained to the outside through the drain pipe 21 of the vacuum pump 2.
In view of the water absorption state, the valve 32 interposed between each water absorption hose 31 and the vacuum pump 2 is closed to stop unnecessary negative pressure driving from the water absorption pipe 3.
In the experimental example, as shown in FIG. 3, the diameter of the cone of the fine aggregate a of about 2000 tons was set to 23 m, and 16 insertion water absorption pipes 3 were inserted on a circle 4 m from the outer edge.
As a result, the water level of the internal surface water was reduced to 2 to 3 m.

<8> Laying of buried pipes A plurality of buried pipes 5 can be buried under the concrete stock floor 1.
The buried pipe 5 is a hollow steel pipe and is configured by attaching a strainer 51 to the tip thereof.
The strainer 51 is a mesh for filtration, and a perforated hole screen in which holes are formed in a stainless steel plate at a specified pitch, or a plain or tatami woven wire mesh made of stainless steel wire, or a reinforcing perforated hole plate is attached to the wire mesh. Dual structure screens are also commercially available.
If the diameter of this hole is set to be smaller than the outer diameter of the fine aggregate a, it is possible to prevent the fine aggregate a from entering and allow only surface water to flow into the embedded pipe 5.
The strainer 51 is positioned in the approximate center of the stock floor 1 and is installed in a state where its net surface is exposed on the surface of the stock floor 1.
Thus, the strainer 51 is attached to one end, and the other end of the buried pipe 5 buried under the stock floor 1 is led out of the stock floor 1 and connected to the vacuum pump 2.
Then, by operating the vacuum pump 2, the surface water sucked by the strainer 51 installed at the tip of the buried pipe 5 and opened to the floor surface can be drained to the outside through the vacuum pump 2.

1: Stock floor 2: Vacuum pump 21: Drain pipe 3: Insertion water absorption pipe 31: Water absorption hose 4: Roof 5: Buried pipe 51: Strainer

Claims (2)

A stock floor covered with a roof,
A vacuum pump,
A water absorption hose connected to a vacuum pump;
A water inlet tube connected to the tip of the water absorption hose;
Buried pipe installed at the bottom of the stock floor,
Consists of a strainer attached to the tip of the buried pipe,
Fine aggregate surface water lowering device. Using the device of claim 1,
Insert the suction pipe into the fine aggregate loaded on the stock floor and drive the vacuum pump,
Furthermore, drainage is performed by driving a vacuum pump connected to a strainer installed at the bottom of the stock floor.
A method for reducing the surface water of fine aggregates.

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