JP3633817B2 - Disposal of raw concrete - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for treating surplus waste ready-mixed concrete (also referred to as return control, residual control or sludge) that remains in a ready-mixed concrete factory or a mixer truck and is discharged together with cleaning water.
[0002]
[Prior art]
Raw concrete discharged when cleaning the drum of a concrete mixer truck has been conventionally guided to a coarse aggregate collection device such as trombol or slanted insulator to separate and collect coarse aggregate such as gravel, followed by a classifier, etc. The fine aggregate such as sand is separated and collected by introducing it into a fine aggregate recovery device, and then this is introduced into a stirring tank to collect supernatant water, and sludge water settled in the stirring tank is filtered into a filter press by a high-pressure pump. It is pumped and dehydrated and processed as cake.
[0003]
[Problems to be solved by the invention]
By the way, the soot discharged from the filter press as described above is composed of fine particles of cement hydrate and is easily dispersed when dumped as it is in the sea or in the ground. However, since an appropriate treatment method has not been established in the past, this may cause environmental destruction.
[0004]
[Means for Solving the Problems]
A method for treating waste ready-mixed concrete according to the present invention is intended to solve the above-described problem, and is a method for treating waste ready-mixed concrete discharged together with washing water from a ready-mixed concrete factory or a mixer truck, and the amount of the waste ready-mixed concrete. It consists of a small-scale treatment process that is performed when there is little waste and a large-scale treatment process that is performed when a large amount of waste ready-mixed concrete is produced. The small-scale process separates and collects coarse aggregate and fine aggregate from waste ready-mixed concrete. After that, the sludge water obtained by guiding it to the stirring tank is dehydrated by a filter press and stored as dredging, while the mass processing step is to remove only coarse aggregate from waste raw concrete. After separating and recovering, the cocoons produced in the small amount processing step are mixed together, and further spread in a plate shape on a vacant land and dried in the sun. After sintering, characterized in that it is an crushed concrete mass into appropriate size by civil engineering machine such as a wheel loader.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a process diagram of the method for treating waste ready-mixed concrete according to the present invention. First, the small-scale treatment process will be described. The small amount treatment process is adopted when there is substantially no waste raw concrete remaining in the drum of the mixer truck returned from the civil engineering construction site or the like, or when the amount is small. In this case, as shown in FIG. 2, the mixer truck 1 is carried into a car wash place, and the washing raw material 2 adhering to the drum is washed by putting the washing water 2 into the in-vehicle drum. Then, the drainage is received by the chute 3, and the drainage is fed to the vibrating screen 5 by a quantitative supply device 4 comprising a screw conveyor provided in the chute, and coarse aggregate such as gravel is fed by the vibrating screen. The sludge 6 containing fine aggregate such as sand is allowed to flow down into the sludge tank 7, and the coarse aggregate 9 is collected in the gravel place 10 by the conveyor 8. The sludge 6 is pumped up by a sand pump 11 provided in the sludge tank 7, transferred to a screw conveyor type classifier 13 through a piping 12, and fine aggregate 14 such as sand separated by the classifier is transferred to a sand storage place 15. Put.
[0006]
Further, the sludge water containing the remaining cement hydrate from which the fine aggregate has been separated in the sludge tank 7 is led to a stirring tank 17 equipped with a stirrer 16. Then, the sludge water 18 settled in the stirring tank 17 is sucked into the receiver tank 20 by the pump 19 and further pumped to the filter press 22 by the high-pressure pump 21 and dehydrated to be formed into the cake (dehydrated cake) 23. The straw 23 is stored in the cake storage 24 and dried naturally. Further, the filtered water 25 discharged from the filter press 22 is stored in the supernatant water tank 26 and is reused as the washing water 2 of the mixer truck 1 by pumping it up with a pump 27 when necessary, or for other uses such as kneading of raw concrete. Is done. Therefore, in this small amount treatment process, as the date and time increases, more and more dried rice cakes 23 remain in the cake storage 24.
[0007]
On the other hand, the mass treatment process is carried out when there is a large amount of ready-mixed concrete that needs to be disposed of in the drum of the mixer truck returned from the civil engineering construction site. As shown, the mixer truck 1 is brought into a car wash, and a large amount of the remaining ready-mixed concrete is guided to a vibrating sieve 5 through a chute 3 to separate coarse aggregates such as gravel, and the coarse aggregate 9 is conveyed by a conveyor. 8 to collect in the gravel place 10. Then, the sludge 6 that has flowed down into the sludge tank 7 is pumped up by the sand pump 11 and is put into the mixer 28 shown in FIG.
[0008]
The mixer 28 is provided with several stirring rods 29, a mixing screw 30 and the like in the container. The mixer 23 is transported from the cake storage 24 by a conveyor 31 or the like and is put into the mixer. The sludge 6 is introduced from the pipe 12 and kneaded. Then, the water in the sludge 6 is absorbed by the basket 23 and discharged from the discharge port 32 so as to become a clay-like material 33 having an appropriate hardness.
[0009]
Then, the clay-like material 33 is spread to a vacant land of an appropriate size by using a wheel loader or the like so as to be a plate shape having a thickness of 10 cm or less, and is allowed to stand and solidify naturally. Thereafter, as shown in FIG. 4, the tip of a shovel 35 such as a wheel loader 34 or a shovel dozer is smashed to form a lump of several millimeters to several centimeters in diameter (for example, a diameter of 25 mm or less, 20 mm depending on the application). Hereinafter, it is classified into 10 mm or less. The concrete mass 36 thus crushed is a recycled aggregate of ready-mixed concrete used for embedding materials that do not require relatively high strength, such as dikes and road foundations, or on deck boards that do not require relatively high strength. Effectively used as
[0010]
The mixing ratio of the slag 23 and the sludge 6 is determined by considering the physical strength necessary for the concrete lump 36. In order to increase the strength, cement or blast furnace slag, quick lime, fly ash, etc. are newly added. May be added.
[0011]
By doing so, the cocoon 23 made in the ready-mixed concrete factory will be consumed to produce concrete blocks as appropriate, so it is no longer necessary to discard the cocoon 23 as troublesome industrial waste as it is outside the factory. This eliminates the costs associated with disposal and the risk of environmental pollution.
[0012]
The present invention can be applied not only to waste ready-mixed concrete discharged from a mixer truck, but also to processing surplus ready-mixed concrete discharged from a ready-mixed concrete factory itself. Moreover, when the above surplus ready-mixed concrete does not arise in large quantities, you may additionally produce and use ready-mixed concrete for the purpose of processing the eaves 23 as mentioned above.
[0013]
【The invention's effect】
As described above, in the method for treating waste ready-mixed concrete according to the present invention, coarse aggregate and fine aggregate are recovered from the waste ready-made concrete through a small amount of processing steps that are usually performed, and filtered water is recovered by dehydration using a filter press. In addition to effectively reusing each one, the dredging is stored and the coarse aggregate is separated and recovered from the waste ready-mixed concrete in a large-scale treatment process that is performed when a large amount of waste ready-mixed concrete is generated occasionally. Kneaded in a mixer, spread in a plate shape on a vacant land, sun-dried and solidified, and then crushed into a concrete block of appropriate size, so that the straw can be used effectively It has a beneficial effect such as eliminating the risk of environmental pollution.
[Brief description of the drawings]
FIG. 1 is a process diagram of a method for treating waste ready-mixed concrete according to the present invention.
FIG. 2 is a schematic view of a small amount processing step.
FIG. 3 is a schematic diagram of a mass processing step.
FIG. 4 is a schematic view of a process of crushing into a concrete block.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mixer truck 2 Washing water 5 Vibrating sieve 9 Coarse aggregate 14 Fine aggregate 17 Agitation tank 18 Sludge water 22 Filter press 23 瀘 滓 25 Filter water 28 Mixer 33 Clay-like material 34 Wheel loader 36 Concrete lump

Claims (1)

A method for treating waste ready-mixed concrete discharged together with washing water from a ready-mixed concrete factory or mixer truck, when a small amount of waste ready-mixed concrete is produced, It consists of a large-scale treatment process to be performed. In the small-scale treatment process, sludge water obtained by separating and collecting coarse aggregate and fine aggregate from waste raw concrete and then guiding it to a stirring tank is dehydrated by a filter press. In the meantime, the mass processing step is to separate and collect only the coarse aggregate from the waste raw concrete, and then consolidate the soot generated in the small amount processing step. Furthermore, after spreading this in a plate shape on a vacant land, drying it in the sun and solidifying it, it was crushed to an appropriate size by a civil engineering machine such as a wheel loader, and the concrete Processing method of waste raw concrete, which is characterized in that the mass.

Images