JPH03187886A - Silo structure and draining method - Google Patents

Abstract

PURPOSE:To prevent a sediment phenomenon completely without increasing the water content in percent of dry weight of sand on the bottom side even at the time of storage for a prolonged term by laying a sand mat for water catchment on a base to which a drip hole is formed. CONSTITUTION:A plurality of drip holes 12 are formed to a bottom 11 and a sand mat 13 for water catchment is laid on the whole surface of the bottom 11 while covering the drip holes 12 in the structure of a silo 1. Punching metals 14 (made of stainless steel) are disposed onto the sand mat 13 for water catchment, and structure in which total weight of sand 2 stored in not applied to the sand mat 13 for water catchment is formed. The sand mat 13 for water catchment does not display a sediment phenomenon by a special filtering function. The other ends of the drip holes 12 are communicated with a drain pipe 121, and water can be drained naturally or drained forcibly by a pump, etc.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to the structure of a silo for storing sand, lightweight aggregate, etc. used as aggregate for concrete, and a method for draining the silo.

[Conventional technology]

The sand used as aggregate for concrete is purchased with a moisture content limit and stored in silos until it is ready for use. When producing concrete, it is metered and transported out from an exit provided at the bottom of the silo or the like using an appropriate transport means such as a vibrating feeder.

[Problem to be solved by the invention]

However, in recent years, the sand situation has become tighter, and if the moisture content is kept within the standard, purchasing costs will increase and delivery will be delayed, so there are an increasing number of cases where sand with a high moisture content has no choice but to be purchased. For the reasons mentioned above, if sand with a high water content is purchased and stored in a silo, over time the water adhering to the sand will settle to the bottom of silo 1, causing a quicksand phenomenon and causing various inconveniences. There is. That is, a vibrating feeder 3, etc., which can weigh and carry out the sand 2 provided at the bottom of the silo is installed, but since the sand 2 that coexists with a large amount of water flows out as quicksand, the vibrating feeder 3, the amount of discharge cannot be controlled at all. In addition, the sand 2 may overflow from the vibrating feeder 3, conveyor 4, etc. and become unable to be conveyed.
Alternatively, sand may flow back onto the conveyor (steep slope or vertical conveyor) leading to the batcher plant, making it impossible to convey it. Furthermore, even if the operation of the vibrating feeder 3 is completely stopped, if the outlet 15 is wide open, the sand 2
may flow out as quicksand and bury the vibrating feeder 3, conveyor 4, etc. For this reason, as shown in Fig. 3, purchased sand 2 may be placed temporarily and drained thoroughly before being stored in the silo 1, or a portion of the sand 2 containing a large amount of water at the bottom may be carried out and placed above. Measures are taken to prevent the formation of sand 2 that coexists with a large amount of water locally, or to cover the vibrating feeder 3 with a sheet 5 when discharging is interrupted. The method of draining the water by placing it in the silo not only requires a large area, but also requires manpower to reload the sand into the silo 1. Sand 2, which contains a large amount of water at the bottom, is carried out and reloaded from above. This method requires huge operating costs and personnel costs, as it requires driving at night, and a significant increase in costs is unavoidable. Also, vibration feeder 3
The method of placing the sheet 5 over the vibrating feeder 3 is effective for a short period of time, but if it continues for a long time, a violent sand phenomenon will occur when restarting, and a large amount of sand 2 will be thrown onto the vibrating feeder 3 at once. It cannot be used as a prize because it will be lost. Therefore, the development of a silo structure and a drainage method that can effectively remove the water that causes quicksand even when sand with a high water content is put in as storage material has been awaited.

[Means to solve the problem]

The present invention has been made in order to solve the problems of the prior art described above, and is a silo structure characterized by having a sand mat for collecting water laid on the bottom surface provided with drainage holes. Water that is brought into the silo by adhering to
This water drainage method for a silo is characterized by collecting water on a water collection sand mat laid on the bottom surface and draining water from a drainage hole provided under the water collection sand mat.

[Effect]

Water that is brought into the silo by adhering to sand or other stored materials oozes out over time and settles to the bottom of the silo, but a sand mat is placed on the bottom of the silo to collect water. Therefore, the settled water is collected in the water collection sand mat without coexisting with the sand at the bottom, and is further discharged from the drainage holes provided under the water collection sand mat. Therefore, even if an outlet is provided at the bottom, almost no water adheres to the sand carried out from the outlet, so that the sand is stably measured and carried out by an appropriate carrying means such as a vibrating feeder.

【Example】

Next, the present invention will be explained in detail based on an illustrated embodiment. The illustrated structure of the silo 1 according to the present invention is such that a plurality of drainage holes 12 are provided in the bottom 11, and a sand mat 13 for collecting water is laid over the entire surface of the bottom 11 to cover the drainage holes 12. . A punching metal 14 (for example, made of stainless steel) is placed on top of the water collecting sand mat 13, so that the entire weight of the stored sand 2 is not applied to the water collecting sand mat 13. . The sand mat 13 for collecting water does not exhibit a quicksand phenomenon due to its special filtering function. The other end of the water drain hole 12 is connected to a drain pipe 121 to allow natural drainage or forced drainage using a pump or the like. The reference numeral 15 is an outlet for sand 2 provided at the bottom 11, and the structure is not particularly different from that provided in conventional silos, and an opening/closing means may or may not be provided. do not have. Also, the loading exit! The configuration of the electromagnetic vibrating feeder 3, which is suspended by an appropriate conveyance means provided below the feeder 5, such as a support spring 31, and whose frequency, amplitude, etc. can be adjusted by a vibrator 32, is not particularly changed.
The structure of the conveyor 4 and the like provided at the distal end of the vibrating feeder 3 on the discharge side is also not particularly changed. By the way, if the hole 141 drilled in the punching metal 14 is made with 5 to 30% area ratio of sand 10 to 50 times the size of the sand 2 to be stored, it may become clogged. Water can be effectively settled on the water collecting sand mat 13 side. Further, instead of the punching metal 14, a woven or nonwoven fabric, a thin film, or the like that can easily transmit water may be used, or these may be used in combination with the punching metal 14. However, when the amount of material to be stored is relatively small, it is not necessary to provide the punching metal 14 or the like.

【Effect of the invention】

As explained above, according to the present invention, water that is brought into the silo by adhering to stored materials such as sand oozes out over time and settles to the bottom of the silo. Because a water collection sand mat is installed, the settled water is collected on the water collection sand mat without coexisting with the sand at the bottom. Water is drained from the hole. Therefore, even if the sand is stored for a long period of time, the moisture content of the sand at the bottom does not increase, and the sand quicksand phenomenon can be completely prevented. Therefore, even if you use a transport means (such as a vibrating feeder) or a transport conveyor that could only be used for sand with a moisture content within the specifications, there will be no overflow of sand and the measurement will be stable. Since it is carried out, there is no need to temporarily store it for draining, saving space and eliminating the trouble of re-moving it, as well as eliminating the need to clean up overflowing sand, etc. Additionally, there is no longer a need for a recycling operation in which a portion of the sand containing a large amount of water at the bottom is taken out and re-injected from above, regardless of day or night, making it possible to significantly reduce operating costs and labor costs. Ta. As described above, according to the present invention, even sand with a high water content can be weighed and transported with the same precision as sand with a low water content using conventional transport means. ,
It is also possible to actively reduce costs by purchasing sand that can be purchased at a low price due to its high moisture content. In addition, not only sand but also other lightweight aggregates are stored in the silo after being sprinkled with water from above the silo before being carried out, so they have the same remarkable effect as the sand described above.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention in cross section, and FIGS. 2 and 3 are explanatory diagrams showing a conventional example. DESCRIPTION OF SYMBOLS 1...Silo, 11...Bottom, 12...Drainage hole, 13...Sand mat for water collection, 14...Punching metal, 15...Export port, 2...Sand, 3... Vibration feeder 31... Support spring, 32... Vibrator, 4... Conveyor 5... Sheet.

Claims (2)

[Claims] (1) A silo structure characterized by having a sand mat for collecting water laid on the bottom surface with drainage holes. (2) Water that adheres to stored materials and is brought into the silo is collected on a water collection sand mat placed on the bottom, and drained from the drain hole provided under the water collection sand mat. A drainage method characterized by: