JP2010167325A - Cutting water circulation system for concrete cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting water circulation system for concrete cutter which has excellent mobility, convenience and waste water treatability in the construction site, and can reuse cutting waste water without contaminating the peripheral environment. <P>SOLUTION: The cutting water circulation system S for concrete cutter is composed of: a stirring tank 1 into which cutting suspension waste water generated when asphalt or concrete is cut is made to flow; a precipitator 2 connected to the stirring tank 1 via a partition 2a; a dehydrator 4 for slurry provided at the lower part of the stirring tank 1; a clean water tank 3 connected to the precipitator 2 via a partition 3a; an air pump 5 subjecting the inside of the stirring tank 1 to aeration stirring and further circulating reservoir water after dehydration to the stirring tank 1; a first filter F1 filtering sludge made to flow into the stirring tank 1; and a second filter F2 further filtering supernatant water in the precipitator 2. Wherein, an inorganic neutral flocculant is added to the stirring tank 1, the precipitator 2 and the clean water tank 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cutting water circulation device for a concrete cutter used for separating and purifying cutting sludge such as asphalt and concrete from suspended wastewater generated in road surface cutting work of paved roads such as asphalt and concrete. It is about.

  When repairing roads paved with concrete or asphalt, and when cutting or drilling rocks or stones, work while cooling the cutter with water to prevent dust scattering and cool frictional heat. Is doing. However, it is environmentally problematic to dispose of suspended wastewater containing discharged cutting waste as it is around the site. Therefore, it is necessary to purify the suspended wastewater with a solid-liquid separator or the like.

  As a technique for recovering and reusing suspended wastewater as described above, a method of separating cutting sludge by passing through a filter, a method of precipitating cutting sludge using a coagulating sedimentation agent, and the like are known. Yes. For example, after the cutting sludge generated when cutting the road surface with a road cutter is agitated together with the flocculant in the first tank, the lower part is opened by the partition plate and divided into two parts in the second tank. A device for agglomerating and settling inside, and allowing the supernatant fresh water to overflow in adjacent partitions and supplying it again to the road cutter as cooling water (see Patent Document 1). A storage tank for storing muddy water / muddy water, a flocculant charging means for adding a flocculant to the muddy water / muddy water, a mixing device for mixing the flocculant and the muddy water / muddy water to generate a flock, and the mixing device A muddy water / muddy water treatment apparatus provided with a filtration device for separating the generated floc from water (see Patent Document 2). A turbid water treatment apparatus comprising an electrode plate group formed by alternately arranging anode electrode plates and cathode electrode plates respectively connected to an anode and a cathode of a DC power supply along the direction of water flow in a flow path section through which turbid water passes. (See Patent Document 3).

JP 2004-130227 A JP 2002-219471 A JP-A-11-226577

  However, the sludge contained in the wastewater cut from the paved road surface has a fine particle size and a high concentration of particles contained in the wastewater. Therefore, the method of adding a flocculant such as aluminum sulfate to the suspended waste water to agglomerate the particles to form a floc increases the volume of the sludge and has poor workability during discharge. In addition, there is a possibility that the flocculant diffuses and contaminates the surrounding environment, and there is a problem that the cost of the medicine is high and the economy is lacking. On the other hand, in the turbid water treatment apparatus that agglomerates particles using the electrode plate, it is difficult to appropriately adjust the amount of turbid water flowing through the electrode plate in conjunction with the filtration device, and there is a problem that workability is poor. Further, in each of the above devices, a flocculant charging means, a power supply unit, and the like must be separately provided, which makes it difficult to make the device compact and cannot be mounted and used flexibly on a construction vehicle. In view of the above-described problems, the present invention can be easily mounted on a road construction vehicle and the like, is excellent in mobility, convenience and wastewater treatment at various construction sites, and does not pollute the surrounding environment. An object of the present invention is to provide a cutting water circulation device for a concrete cutter that can be quickly purified and reused.

  A cutting water circulation device for a concrete cutter according to the present invention that achieves this object is a funnel-shaped stirring tank into which cutting suspension wastewater generated when cutting asphalt or concrete flows, and is connected to the stirring tank through a partition wall. And a slurry dehydrator installed movably below the agitation tank, a fresh water tank connected to the precipitation tank through a partition, and aeration and agitation in the agitation tank , An air pump that circulates the dehydrated water to the agitation tank, a first filter that separates sludge in the sludge water that has flowed into the agitation tank and flows out to the precipitation tank, and further filters the supernatant water of the precipitation tank And a second filter led out to the fresh water tank. The first characteristic is that an inorganic neutral flocculant is added to all of the stirring tank, the precipitation tank and the fresh water tank. A second feature is that the slurry dehydrator is provided with a press device and the slurry is squeezed. Further, the inorganic neutral flocculant is composed of 52% sulfur trioxide, 20% calcium oxide, 0. The third characteristic is that it is 1%, less than 0.1% sodium oxide, and its physical properties are pH 7.3 (24.7 ° C.) and ignition loss 9.5%.

The present invention has the following excellent effects.
(1) Since an inorganic neutral coagulant is used, the wastewater can be purified without adversely affecting the surrounding environment with high safety.
(2) Since the inside of the agitation tank is aerated and agitated by an air pump, sedimentation separation can be promoted without disturbing the sludge once settled.
(3) Since the stirring tank is formed in a funnel shape, it can be gradually converged and settled while the suspended water combined with the flocculant dissolved water settles.
(4) Since it is not necessary to separately provide a flocculant charging means, a power supply unit, and the like, it is possible to reduce the size of the flocculant and to install it on a construction transfer vehicle or the like and use it flexibly.

It is a perspective view showing typically composition of a cutting water circulation device for concrete cutters concerning the present invention. It is a top view of FIG. It is a front view of FIG. It is a side view of FIG. It is a perspective view which shows the state which mounted this invention apparatus in the transfer vehicle.

Hereinafter, embodiments of the present invention will be described based on examples shown in the drawings.
1 is a perspective view schematically showing a configuration of a cutting water circulating apparatus for a concrete cutter according to the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a front view of FIG. 1, and FIG. 4 is a side view of FIG. FIG. 5 is a perspective view showing a state in which the device of the present invention is mounted on a transfer vehicle.

An embodiment of a cutting water circulation device for a concrete cutter according to the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 4, the cutting water circulation device S for a concrete cutter according to the present invention is formed into a square shape as a whole, and a stirring tank into which cutting suspension wastewater generated when cutting asphalt or concrete flows. 1, a precipitation tank 2 connected to the stirring tank 1 via a partition wall 2 a, a slurry dehydrator 4 movably provided below the stirring tank 1, and a precipitation tank 2 via a partition wall 3 a The fresh water tank 3 provided continuously, the air pump 5 that agitates the inside of the stirring tank 1 and circulates the dehydrated water to the stirring tank 1, and the sludge in the sludge water that has flowed into the stirring tank 1 is separated by filtration. 1 and the second filter F2 that further filters the supernatant water of the settling tank 2 and leads it to the fresh water tank 3, and includes all of the stirring tank 1, the settling tank 2, and the fresh water tank 3. It is composed by adding an inorganic neutral flocculant to There.

  The lower part 1a of the stirring tank 1 is formed with both sides inclined in a funnel shape that gradually narrows downward, and a solid content discharge pipe 1b is provided in communication with the lowermost part of the funnel-like part. By opening a valve (not shown) of the solid content discharge pipe 1b, the slurry dehydrator 4 disposed below the stirring tank 1 contains some water deposited and deposited on the lower part 1a of the stirring tank 1. The slurry-like concrete residue is discharged.

  The bowl-shaped slurry dehydrator 4 includes, for example, a bag-shaped filter cloth disposed in the bowl, dewaters the slurry-like concrete residue discharged from the agitation tank 1, and is further squeezed by the press device 12 to include The amount of water can be reduced, and industrial waste treatment costs can also be reduced. Then, the filtered water flows down to the dehydration tank 6 and is stored. For the filter cloth, a woven or non-woven fabric made of synthetic fibers such as polyamide, polyester, polyolefin, and vinyl acetate may be used. Further, as the pressing device 12, a motor type, hydraulic type, pneumatic type jack or the like is used.

  An inorganic flocculant is added to all the stored water in the stirring tank 1, the precipitation tank 2, and the fresh water tank 3 to form dissolved water. Table 1 shows an example of the components of the inorganic flocculant used in this example.

  In the figure, 7 is a road surface cutter for cutting asphalt or concrete with a rotary blade, and 8 is a suspension for sucking and collecting suspended wastewater discharged from the road surface cutter 7 and introducing it into the cutting water circulation device S for concrete cutter. A muddy waste water collecting pipe 9 is a lubricating cooling water supply pipe for supplying treated water purified by the cutting water circulation device S for concrete cutter to the road surface cutter 7 as lubricating cooling water. Reference numeral 10 denotes a stored water supply pipe that circulates the stored water in the dehydrating tank 6 to the stirring tank 1 and ejects air for aeration and stirring in the stirring tank 1 by the air pump 5. As described above, since the inside of the agitation tank 1 is aerated and agitated, compared to the case where a mechanical agitation device such as an agitation blade is used, the sedimentation separation is promoted without disturbing the sludge once settled. Can do. In addition, it can be used for muddy water treatment of civil engineering, industrial systems, and ready-mixed concrete.

  In addition, as shown in FIG. 5, the cutting water circulation apparatus S for concrete cutters of this invention is mounted in the transfer vehicle 11 for construction, and can be conveyed. The road surface cutter 7 is used for cutting and drilling concrete, asphalt, rock, stone, etc. in addition to road surfaces such as asphalt roads and concrete roads. The suspended waste water can also be filtered.

  The device of the present invention can be easily mounted on a construction transfer vehicle, and can efficiently purify and reuse waste water after being used with a road cutter without polluting the environment at the construction site. A road cutter can be used even on a site without facilities, which is not only convenient, but also has excellent mobility and workability. Further, since it can be used by being connected to a hose from a road surface cutter while being loaded on a transfer vehicle, the industrial applicability is high in that it can eliminate environmental pollution caused by dripping the cutting drainage around the construction site.

DESCRIPTION OF SYMBOLS 1 Stirring tank 1a Funnel-shaped lower part 1b Slurry discharge pipe 2 Precipitation tank 2a Bulkhead 3 Fresh water tank 3a Bulkhead 4 Slurry dehydrator 5 Air pump 6 Dehydration tank 7 Road surface cutter 8 Suspension drainage collection pipe 9 Lubricating cooling water supply pipe 10 Reservation water Supply pipe 11 Construction transfer vehicle 12 Dewatering press device S Cutting water circulating device for concrete cutter F1 First filter F2 Second filter

Claims (3)

A funnel-shaped agitation tank into which cutting suspension wastewater generated when cutting asphalt or concrete flows, a settling tank connected to the agitation tank via a partition wall, and movable below the agitation tank An installed slurry dehydrator, a fresh water tank connected to the settling tank via a partition wall, an air pump for aeration and stirring in the stirring tank, and circulating the dehydrated water to the stirring tank; It consists of a first filter that separates sludge in the sludge water that has flowed into the stirring tank and flows out to the settling tank, and a second filter that further filters the supernatant water of the settling tank and leads it to a fresh water tank, A cutting water circulation device for a concrete cutter, wherein an inorganic neutral flocculant is added to all of the stirring tank, the precipitation tank, and the fresh water tank. 2. The cutting water circulation device for a concrete cutter according to claim 1, wherein the slurry dehydrator is provided with a press device to squeeze the slurry. The inorganic neutral flocculant component is 52% sulfur trioxide, 20% calcium oxide, 0.1% silica, and less than 0.1% sodium oxide, and its physical properties are pH 7.3 (24.7 ° C.), The cutting water circulation device for a concrete cutter according to claim 1 or 2, wherein the ignition loss is 9.5%.

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