JP7289426B1 - Concrete slurry processing equipment - Google Patents

Abstract

Kind Code: A1 A concrete slurry treatment apparatus is provided for facilitating the solidification of solids made of sand, gravel, and cement scooped up from a water tank, increasing the solidification strength, and reducing the disposal cost of waste. Kind Code: A1 A concrete slurry processing apparatus in which solids s composed of gravel, sand, and cement that settle on the bottom of a water tank 1 are raked up on an inclined surface 6, and the raked-up solids s are temporarily stored. A container 24 for mixing is provided, a spiral stirring blade 26 is provided in the container 24, and the gravel, sand, and cement are mixed by rotating and stirring the stirring blade 26, and then the solid matter is s is discharged from the container 24 and solidified. [Selection drawing] Fig. 2

Description

The present invention relates to a concrete slurry treatment apparatus for treating waste water containing gravel, sand and cement (also called concrete slurry or cement sludge) discharged from the drum of a concrete mixer truck.

Generally, in a ready-mixed concrete factory, it is necessary to inject water into the drum of the concrete mixer truck that has returned the ready-mixed concrete and wash it. discharged in large quantities.
The following Patent Documents 1 to 3 show devices for treating concrete slurry discharged in this way. In these concrete slurry treating devices, the bottom portion of a water tank into which concrete slurry is introduced is formed substantially horizontally. A plurality of rakes are attached to an endless conveyor chain at suitable intervals, and the rakes move from the bottom surface of the water tank to the inclined surface. By circulating the conveyor chain at a low speed so that the solid matter such as gravel, sand, and cement settled on the bottom surface of the water tank is raked up on the inclined surface portion and discharged from the upper edge of the inclined surface portion to the outside. The water is dropped and discharged, and the supernatant water of the water tank is discharged from a drainage gate provided on the side wall of the water tank.

Japanese Patent No. 4277057 Japanese Patent No. 6456870 Japanese Patent No. 6643447

By the way, in this type of concrete slurry processing apparatus, the conveyor chain needs to be driven to circulate day and night in order to prevent the cement from hardening due to hydration reaction in the water tank. Therefore, gravel and sand that tend to settle on the bottom of the water tank are first raked up by the inclined surface and then dropped and discharged to the outside from the upper edge of the inclined surface, after which the cement component is raked up. For this reason, gravel/sand and cement are discharged in a separated state, and if they are separated in this way, it becomes difficult for them to harden due to the hydration reaction of cement, and even if hardened, the strength is weak. There was a risk of becoming In this way, if the consolidation strength is weak, it cannot be molded into concrete products or reused as a roadbed material, and it is not easy to dispose of it as waste, so there is a problem that the disposal cost is high. there were.
The present invention is intended to solve such problems.

For this purpose, in the present invention, the bottom portion of a water tank containing concrete slurry is formed substantially horizontally, the water tank is formed with an inclined surface portion extending obliquely upward from the bottom portion, and a plurality of rakes are attached to an endless conveyor chain. Gravel, sand, and cement settled on the bottom of the water tank by circulating the conveyor chain so that the rake moves from the bottom to the inclined surface of the water tank. A concrete slurry treatment apparatus configured to rake up solids onto the inclined surface portion and discharge supernatant water from the water tank through a drain gate provided in the water tank,
A container having a U-shaped cross section with an open upper surface for allowing the solids to flow in is disposed substantially horizontally so that the longitudinal direction is perpendicular to the direction of inclination of the inclined surface portion, and a helical stirring blade is installed in the container. is provided along the U-shaped bottom of the container, and the solids are stirred by rotating the stirring blades to mix the gravel, sand, and cement, and then the solids are discharged from the container and solidified. It is characterized by doing so.

Further, in the concrete slurry processing apparatus of the present invention, the agitating blade comprises a pair of helical blade members having different torsion directions symmetrically provided on a rotating shaft that spans the center of the container. An opening is formed in the bottom portion of the container corresponding to the middle of the container, and the opening is provided with an open/close shutter.

Further, the present invention is characterized in that, in the above concrete slurry processing apparatus, a cement feeding hopper for adding new cement to the container is provided.

Further, in the concrete slurry processing apparatus of the present invention, hoppers for introducing cement are provided so as to face both ends of the open upper surface of the container, and the stirring blades are twisted around a rotating shaft that extends across the center of the container. A pair of helical blade members with different directions are provided symmetrically, an opening is formed in the bottom portion of the container corresponding to the middle of both blade members, and an open/close shutter is provided in the opening. and

Since the solids made of sand, gravel, and cement raked up from the water tank are stirred by the stirring blades, the solids are easily solidified, and the solidification strength is increased. Therefore, the disposal cost as waste can be reduced.
Moreover, by adding cement anew, it is possible to secure a further required strength, to enable reuse as a concrete product, and to further reduce processing costs.

1 is an external side view of a concrete slurry treatment apparatus showing an embodiment of the present invention; FIG. BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal side view of the concrete slurry processing apparatus which shows embodiment of this invention. FIG. 3 is an enlarged view of a main portion of FIG. 2; FIG. 4 is a cross-sectional view along the line AA of FIG. 3; FIG. 5 is a cross-sectional view taken along the line BB of FIG. 4;

The water tank 1 into which the concrete slurry is poured is, as shown in FIGS. The top is open. An inclined surface portion 6 extending obliquely upward from the bottom surface portion 5 is formed at the front edge of the water tank 1, and the inclined surface portion 6 is supported by columns 6a and 6b so as to be inclined at about 30 degrees with respect to the horizontal plane. . Side wall plates 7 and 8 are formed on both side edges of the inclined surface portion 6, and a discharge port 9 is formed on the upper edge of the inclined surface portion 6. As shown in FIG.

A support shaft 10 is horizontally laid between both side plates 2 and 3 at the rear of the water tank 1, and a pair of guide wheels 11 are supported on the support shaft 10 with a predetermined gap therebetween. The boundary between the bottom surface portion 5 and the inclined surface portion 6 of the water tank 1 is formed in an arc surface so as to be connected gently, and a support shaft 12 is horizontally mounted between the side plates 2 and 3 on which the arc surface-shaped bottom surface is located. A pair of guide wheels 13 are supported on the support shaft 12 with a predetermined distance therebetween. Also, as shown in FIG. 3, a rotary shaft 15 is rotatably supported near the upper ends of the side walls 7 and 8 of the inclined surface portion 6, and a pair of sprockets 16 are mounted on the rotary shaft 15 at a predetermined distance. is fixed, and the rotating shaft 15 is linked to a rotating output shaft of a drive mechanism (not shown) consisting of a motor and a speed reducer, and by operating the driving mechanism, the rotating shaft 15 is rotationally driven, and the sprocket 16 is rotated at a low speed in the direction of the arrow.

Conveyor chains 17a and 17b are formed in an endless (annular) shape by linking a large number of links to the pair of guide wheels 11, 13 and sprocket 16 with rollers interposed therebetween, respectively. It's hanging. A horizontal guide plate 18 for slidably supporting the conveyor chains 17a and 17b is provided between the upper side plates 2 and 3 of the water tank 1. As shown in FIG. A plurality of rakes 19 are attached to the outer periphery of the conveyor chains 17a and 17b at suitable intervals. When the sprocket 16 is rotationally driven, the conveyor chains 17a and 17b rotate in the direction of the arrow, and the rakes 19 rotate. It moves across the bottom portion 5 and the inclined surface portion 6 of the water tank 1 in the direction indicated by the arrow. For this reason, solids such as gravel, sand, cement, etc. that have settled on the bottom surface of the water tank 1 are raked up to the inclined surface portion 6 by the rake 19 and discharged from the outlet 9 at the upper edge of the inclined surface portion 6 to the outside. Dropped and ejected. In addition, w indicates the water surface of the concrete slurry thrown into the water tank 1, and s indicates the solid matter raked up by the rake 19. As shown in FIG.

Also, as shown in FIG. 2, a drain gate 20 for draining the supernatant water of the water tank 1 is provided on a part of one side plate 3 constituting the water tank 1 . The drain gate 20 is formed by stacking a plurality of straight tubular pipes (cylindrical members) horizontally, as described in Patent Documents 1 to 3, for example. Drain the clear water out of the tank.

Reference numeral 21 denotes a concrete pit formed on the ground below the discharge port 9 in a U-shape in plan view, and 22 denotes a portable container arranged in the pit. In addition, the portable container 22 has a space for inserting a fork at the bottom so that it can be easily transported by using a forklift (not shown) or the like. A steel frame 23 is constructed on the pit 21 and supports a container 24 for receiving the solid matter s dropped and discharged from the discharge port 9 . The container 24 has a U-shaped cross section with an open top, and is arranged horizontally so that its longitudinal direction is perpendicular to the direction of inclination of the inclined surface portion 6 . As shown in FIG. 4, the entire length of the container 24 is set so that both ends 24a and 24b of the container 24 protrude outward beyond the side walls 7 and 8 of the inclined surface portion 6. As shown in FIG. A rotating shaft 25 is rotatably mounted across the center of the container 24 by means of bearings 25a and 25b provided on both end walls of the container 24, and a helical stirring blade 26 is attached to the rotating shaft 25 to form the U of the container. It is arranged along the bottom of the glyph. More specifically, the stirring blade 26 is formed by forming blade members 26a and 26b by spirally forming a ribbon-like plate member with a constant width, and the blade members 26a and 26b are divided into spoke portions 26' and hub portions 25'. As shown in FIG. 4, the left blade member 26a and the right blade member 26b have different twisting directions.
A sprocket 27 is fixed to one end of the rotary shaft 25 and protrudes outside the container 24, and the sprocket 27 is connected to a motor 28 by a chain or the like. It is designed to be rotationally driven in the direction of the arrow. An opening 29 is formed in the bottom portion of the container 24 corresponding to the middle of both blade members 26a and 26b, and an open/close shutter 30 is provided outside the opening 29 so as to be opened and closed by the operation of a fluid pressure cylinder 31. As shown in FIG. The portable container 22 is positioned directly below the opening 29 .

In addition, a scaffolding board 32 that allows a person to safely get on and off is supported on the yagura 23 so as to be positioned above the container 24, and a rail 33 is horizontally supported further above the scaffolding board 32, and the block chain 34 is suspended so as to be slidable along the rail 33 . By suspending a cement bag (not shown) on the hook 35 of the block chain 34, new cement can be transported onto the scaffold board 32. A pair of cement-feeding hoppers 36a, 36b are fixed so as to hang down from an opening provided in the scaffolding board 32, and the lower ends of the cement-feeding hoppers 36a, 36b are attached to both ends 24a, 24b of the container 24. facing the inside.

In the concrete slurry processing apparatus constructed as described above, the opening 29 is normally closed by the open/close shutter 30 as shown in FIG. The discharged solids s are dropped into the container 24 and temporarily stored in the container 24 . The solids s are stirred by rotating the stirring blades 26 by the motor 28 at appropriate times to mix the gravel, sand and cement of the solids s. At this time, since the blade members 26a and 26b of the stirring blade 26 are formed empty with only the spoke portion 26 near the central portion near the rotating shaft 25 as described above, they are positioned at the bottom portion of the container 24. The solid matter moves in the direction of the opening 29 corresponding to the middle of the blade members 26a and 26b by the blade members 26a and 26b, but returns through the gap between the spoke portions 26 after the movement. The solid matter s reciprocates left and right in the container 24 and is repeatedly agitated to sufficiently mix the gravel, sand and cement. Moreover, since the pair of helical blade members 26a and 26b with different twisting directions are provided symmetrically in the longitudinal direction of the rotary shaft 25, such agitation is further promoted. While the stirring is continued, if necessary, new cement is added to both ends 24a and 24b of the container 24 from the cement charging hoppers 36a and 36b, so that the new cement is also mixed with the solid matter s. Let When the mixture is sufficiently mixed, the opening/closing shutter 30 is opened to discharge the mixture from the opening 29 into the portable container 22 . A forklift (not shown) then transports the portable container 22 to a certain location, such as a mold, where the mixture is solidified and molded into the desired concrete product.

As described above, in the present invention, the solids s scooped up from the water tank 1 are temporarily stored in the container 24 and stirred by the stirring blades 26, so that the solids s are easily solidified and the solidification strength is increased. Therefore, the disposal cost as waste can be reduced. Moreover, by adding cement anew, it is possible to secure a further required strength, to enable reuse as a concrete product, and to further reduce processing costs.

In this embodiment, the portable container 22 is arranged directly under the container 24, but a molding die or the like may be arranged so that the mixture discharged from the container 24 directly flows into the molding die or the like.
Also, in this embodiment, a stack of straight pipes is shown as the drain gate 20, but a drain gate having another structure can be provided as long as it allows the supernatant water in the water tank 1 to flow out. Also, the arrangement structure of the water tank 1 and the conveyor chains 17a and 17b can be appropriately changed according to the application and installation location.

1 Water tank 6 Inclined surface parts 17a, 17b Conveyor chain 19 Rake 20 Draining gate 24 Container 24a, 24b End part 25 Rotating shaft 26 Stirring blades 26a, 26b Blade member 29 Opening 30 Open/close shutters 36a, 36b Cement throwing hopper s Solid matter

Claims (4)

The bottom portion of a water tank containing concrete slurry is formed substantially horizontally, the water tank is formed with an inclined surface portion extending obliquely upward from the bottom portion, and a plurality of rakes are attached to an endless conveyor chain at appropriate intervals. The conveyor chain is circulated so that the rake moves from the bottom surface of the water tank to the inclined surface, thereby removing the solids such as gravel, sand, and cement settled on the bottom of the water tank from the inclined surface. A concrete slurry treatment apparatus that rakes up the concrete slurry and discharges the supernatant water of the water tank from a drain gate provided in the water tank,
A container having a U-shaped cross section with an open upper surface for allowing the solids to flow in is disposed substantially horizontally so that the longitudinal direction is perpendicular to the direction of inclination of the inclined surface portion, and a helical stirring blade is installed in the container. is provided along the U-shaped bottom of the container, and the solids are stirred by rotating the stirring blades to mix the gravel, sand, and cement, and then the solids are discharged from the container and solidified. A concrete slurry processing apparatus characterized by: The agitating blade comprises a pair of helical blade members with different twisting directions symmetrically provided on a rotating shaft that spans the center of the container. 2. A concrete slurry treatment apparatus according to claim 1, wherein an opening is formed and an open/close shutter is provided in said opening. 3. A concrete slurry treatment apparatus according to claim 1, further comprising a cement charging hopper for adding new cement to said container. Cement charging hoppers are provided so as to face both ends of the open upper surface of the container, and the stirring blades have a pair of helical blade members with different twisting directions on a rotating shaft that spans the center of the container. 4. The container according to any one of claims 1 to 3, characterized in that it is provided bilaterally symmetrically, an opening is formed in the bottom portion of the container corresponding to the middle of both blade members, and an open/close shutter is provided in the opening. Concrete slurry treatment equipment as described.

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