JPS6227965B2 - - Google Patents

Description

Detailed Description of the Invention The present invention cleans the remaining ready-mixed concrete of a ready-mixed concrete plant or the remaining ready-mixed concrete in the drum of a mixer truck, separates coarse aggregate from the washing water, and then separates fine aggregate. Then, the water is separated into sludge-containing water and sludge-free water, and the sludge-free water is reused as washing water, and the sludge-containing water is reused as concrete mixing water. This article relates to the most effective method for processing residual fresh concrete.

The conventional treatment method is to temporarily store the remaining fresh concrete in a mud collecting tank, and then supply all of the remaining fresh concrete in this mud collecting tank directly to a trommel using a sand pump, and then sequentially to a crusher. While conveying, coarse aggregate such as gravel was first separated and then fine aggregate such as sand was separated and recovered, but in order to completely convey gravel etc. A large amount of water must be mixed into the pump, and a special high-performance pump must be used, which requires an enormous amount of pump energy. Furthermore, since the remaining live concrete is once stored in the mud collection tank, there is a drawback that the remaining live concrete containing gravel is likely to solidify in the mud collection tank.

Alternatively, without using a sand pump, a trommel is placed above the crucifyer, and while the remaining live concrete is sent directly to the trommel, coarse aggregate such as gravel is first separated, and then fine aggregate such as sand is separated and recovered. However, in this case, water containing fine aggregate such as sand after separating and collecting coarse aggregate such as gravel is directly supplied to the crusher, that is, the total amount input from the mixer truck is Since all of the water is supplied without adjustment, the amount of inflow water per unit time is not constant, and in a crusher that separates and recovers by sedimentation, it has a negative effect on the separation performance of sand etc., making it difficult to separate. The drawback was that it was unstable. Furthermore, since the crusher iron must be fixedly installed below the trommel, there is also a drawback that the installation position of the crusher cannot be freely selected.

The present invention aims to eliminate such drawbacks of the conventional method, and its feature is that the remaining fresh concrete discharged from a ready-mixed concrete plant or mixer truck can be transferred to a coarse aggregate recovery device using only falling energy. The residual amount is recovered by primary recovery in which the coarse aggregate is separated by guiding the aggregate, and secondary recovery in which the remaining amount is transferred to any desired position via pump means to separate the fine aggregate. It is a method for processing residual concrete that separates and recovers coarse aggregate and fine aggregate from concrete.

Hereinafter, an example of implementing the method of the present invention will be described based on drawings of a specific example of an apparatus.

Figure 1 is a flow sheet schematically showing the whole.
Figure 2 shows a coarse aggregate recovery device, where A is a plan view, B is a side view of A in the X-X direction, and C is a Y of A.
- It is a side view in the Y-line direction.

1 is a car wash on the ground surface, and 2 is a trommel as a primary recovery device for recovering coarse aggregate such as gravel, which is installed on the same ground surface as the car wash. 3 is the first sewage tank bored under the bottom of the trommel; 4
5 is a sand pump installed in the water tank; 5 is a crusher for recovering fine aggregate such as sand as a secondary recovery device;
are connected via. Reference numeral 7 denotes a second sewage tank into which water containing residual sludge (cement hydrate) separated from the crusher 5 such as sand flows through a pipe 8. Here, the second sewage tank is equipped with a stirring blade 9 and a pump 1.
0 is provided, and water containing sludge is sent from a pump 10 to a sewage treatment device 12 to be described later via a pipe 11 in order to be reused for mixing concrete and water not containing sludge for reuse for car washing. It can be done.

Next, the sewage treatment device 12 is constructed as follows. 13 is a purification tank, 14 is an adjustment tank provided under the bottom surface of the tank, and the adjustment tank is provided with a stirring blade 15 and a pumping pump 16, and the stirring blade and pumping pump 16 are operated at any time. That is, the water containing sludge flowing down from the purification tank into the adjustment tank is adjusted in the tank to an appropriate concentration for mixing concrete, and is sent through the pipe 17 into the water meter 19 of the batcher plant 18. , it is now possible to measure and use the required amount. At this time, water containing excess sludge overflows and flows back into the adjustment tank 14 via the pipe 21. On the other hand, 22 is a water storage tank into which sludge-free water separated from sludge in the purification tank 13 overflows from its upper edge and flows into the tank through a pipe 23. Fresh water from local underground water or industrial water is supplementarily introduced through a pipe 24. The water stored in this tank is used for car washing through a pipe 26 using a pump 25. In addition, the water in the tank is supplied to the pipe 2 using the pump 27.
8 for concentration adjustment in the adjustment tank 14. 29 is a concentration meter.

An example of implementing the method of the present invention has been described above based on a flow sheet, and FIG. 2 shows an explanatory diagram of the actual arrangement of a coarse aggregate recovery device. Both the trommel 2 and the crusher 5 are provided at positions facing each other at right angles on the ground surface 1. In the drawing, three mixer trucks can be washed at the same time, and 30 is trommel 2.
This is a water collection gutter heading towards the. Here, the first sewage tank 3 below the trommel 2 is formed with an inclined wall a, and the sand pump 4 on the bottom surface is movably suspended from a rail mount 31 by a chain block 32 with a trolley. This is to ensure that the sewage is pumped up uniformly by moving around the sewage tank as needed.

Reference numeral 33 is a hopper attached to the outlet end of the trommel 2, and the coarse aggregate sieved by the trommel 2 falls onto a belt conveyor 34 through the hopper, and the belt conveyor collects gravel. It is taken out into the tank 35. During this process, the sewage accumulated in the groove is returned to the first sewage tank via a pipe 37 by a pump 36. In addition, 37 is a crusher supply port, and water containing fine aggregate from the sand pump 4 is supplied to this part via a pipe 6, and the sand that settles on the bottom is scraped up by a screw conveyor b and sent to a recovery sand tank. 38 and the water containing sludge overflows from the outlet 39 and flows into the second sewage tank 7 via the pipe 8.

As described above, when processing the remaining fresh concrete, this embodiment equipment first performs the primary recovery of coarse aggregate such as gravel using the coarse aggregate recovery device at the same location on the ground as the car wash. Since the water containing the remaining fine aggregate is sent to the fine aggregate recovery device for secondary recovery of fine aggregate such as sand, the sand pump used as a transportation means is a commercially available small diameter and inexpensive one. can be used, and there is no need for a special pump like in the past. Further, problems such as inoperability due to jamming do not occur, and since the car wash and trommel can be installed on the same ground surface, equipment costs are reduced and operation and use are facilitated.

The present invention relates to a method for processing residual ready-mixed concrete as described above, in which the remaining ready-mixed concrete discharged from a ready-mixed concrete plant or a mixer truck is processed by a coarse aggregate recovery device using only the falling energy of the remaining ready-mixed concrete. It is superior in that it allows for a processing process that can be directly fed into the plant, and since the coarse aggregate is first recovered, the remaining fine aggregate can be collected using commercially available small-diameter pumps, saving energy and stably. It has the advantage of being able to supply a fixed amount of the collected material to the separation means in the next process, and the flexible pump piping allows the collection site for secondary recovery to be installed at any desired location, allowing for free storage and storage of fine aggregate. Storage location can be changed. Quantitatively supplying the remaining amount after the primary recovery for secondary recovery is extremely effective in that the aggregate can be separated and recovered most effectively.

[Brief explanation of the drawing]

The attached drawings show an example of carrying out the method of the present invention, in which Fig. 1 is a flow sheet schematically showing the whole, Fig. 2 shows a coarse aggregate recovery device, and A is a plan view. , B is a side view of A in the XX line direction, and C is a side view of A in the YY line direction. 1... Car wash, 2... Trommel, 3... 1st
Sewage tank, 4... Sand pump, 5... Crassifier, 7... Second sewage tank, 13... Purification tank, 14... Adjustment tank, 35... Recovered gravel tank, 36
...Recovered sand tank.

Claims (1)

[Claims] 1 The remaining ready-mixed concrete discharged from a ready-mixed concrete plant or mixer truck is guided to a coarse aggregate recovery device using only falling energy to perform primary recovery in which coarse aggregate is separated, and the remaining amount is collected as desired via pump means. A method for processing residual raw concrete in which coarse aggregate and fine aggregate are separated and recovered from the residual raw concrete by performing secondary recovery in which fine aggregate is separated by transporting the raw concrete to a suitable location.