JP2006255557A - Stirrer and method for treating soil and sand - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stirrer and a method for treating soil and sand in which a good quality of improved soil can be obtained even from soil and sand having a high water content. <P>SOLUTION: There is provided a paddle type continuous mixer in which a movable sheathing board 152 is provided between an extrusion position substantially vertically extruding inside of a casing 110 from a bottom surface 111 and a trough bottom surface 111a thereof to prevent soil and sand from moving downstream and a retreat position retreating from the inside of the casing 110 to allow the soil and sand to move downstream, whereby it can be prevented that the soil and sand can not be sufficiently mixed with an improving material thereof to be discharged from a discharge port 117 and therefore, a good quality of improved soil can be obtained even from soil and sand having a high water content to be treated by sufficient mixing of the soil and sand with an improving material thereof. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a stirrer that stirs by rotation of a stirring blade, and a soil treatment method that modifies soil by mixing with a soil conditioner.

  2. Description of the Related Art There is known a soil quality improvement device capable of obtaining improved soil by mixing water-containing soil and soil quality improving material. In this soil improvement device, the supplied soil and the soil improvement material are stirred and mixed to continuously generate the improved soil (see Patent Document 1).

JP 2000-355930 A

  However, in the conventional soil improvement device, if the moisture content of the soil to be treated is high, the soil and the soil improvement material are not sufficiently mixed and discharged from the discharge port, so it is possible to obtain a high quality improved soil. could not.

(1) A stirrer according to the invention of claim 1 includes a rotating shaft disposed along the casing in the casing, and an object to be stirred which is disposed on the outer peripheral surface of the rotating shaft and is charged into the casing. Agitating blades that convey from one side of the extending direction of the rotating shaft to the other while stirring, a protruding position that protrudes into the casing to prevent the object to be stirred downstream, and is agitated by retreating from the casing And a dam that is movable between a retreat position that permits movement of the object downstream.
(2) According to a second aspect of the present invention, in the stirring device according to the first aspect, the casing and the rotating shaft extend in a substantially horizontal direction.
(3) The invention of claim 3 is the stirring apparatus according to claim 1 or 2, wherein the stirring blade is a stirring paddle.
(4) In the method for treating earth and sand according to the invention of claim 4, the improved soil is produced by stirring and mixing while blocking so that a predetermined amount of soil containing moisture and the soil quality improving material do not flow out. After the generation, the continuous supply of soil and soil improvement material is started, and the improved soil is stirred and mixed while blocking so that the generated soil does not flow out of the soil and soil improvement material. It is characterized by being continuously generated.
(5) The invention of claim 5 is characterized in that, in the method for treating earth and sand according to claim 4, improved soil is generated using the stirring device according to any one of claims 1 to 3.

  According to the present invention, the stirring blade that transports from one side of the extending direction of the rotating shaft to the other while stirring the stirring object that has been put into the casing, and protrudes into the casing to the downstream of the stirring object. The stirrer is provided with a weir that is movable between a projecting position that prevents movement and a retreat position that retreats from the casing and permits movement of the object to be stirred downstream. As a result, it is possible to prevent the soil and the soil conditioner from being discharged from the discharge port without being sufficiently mixed, so that even if the water content of the soil to be treated is high, the soil and the soil conditioner are sufficiently Good quality improved soil can be obtained by mixing

  An embodiment of the stirring device according to the present invention will be described with reference to FIGS. FIG. 1 is a diagram illustrating an overall configuration of a sediment processing apparatus in which the stirring device of the present embodiment is used, and FIGS. 2A and 2B are views of the stirring device taken along the line II-II in FIG. FIG. The earth and sand treatment apparatus 1 is an apparatus that mixes earth and sand generated at a construction site and the like with a soil quality improving material and reforms it into improved earth, and includes a stirring device (mixer) 100 and a belt conveyor 200. The improved soil 301 generated by the earth and sand treatment device 1 is transported by the belt conveyor 200 and temporarily stored in the discharge yard 400.

  The mixer 100 is a container-fixed type mixer having two rotating shafts extending in a substantially horizontal direction, and stirring and mixing of earth and sand and soil quality improving material by paddles attached to the respective rotating shafts. And a horizontal rotating shaft type two-shaft paddle type continuous mixer that performs transfer. The mixer 100 includes a casing 110, rotating shafts 120 and 130 to which a paddle 102 is attached, a hydraulic motor 140 with a speed reducer, and a movable weir mechanism 150. In the mixer 100, a casing 110 is supported by a frame 101, and is disposed at a predetermined height position in the vicinity of a place where earth and sand is generated such as a construction site.

  The casing 110 has a bottom surface 111, a side surface 112 rising vertically from the bottom surface 111 and parallel to the axial direction of the rotation shafts 120 and 130, and a vertical surface rising from the bottom surface 111 and axial direction of the rotation shafts 120 and 130. It has a vertical upstream side surface 113 and a downstream side surface 114, and an upper plate 115. An arc-shaped trough bottom surface 111 a centering on the axis of the rotation shafts 120 and 130 is provided inside the bottom surface 111. On the upstream side of the upper plate 115, there is provided an insertion port 116 for introducing earth and sand and a soil quality improving material. On the downstream side of the bottom surface 111, a discharge port 117 for discharging the mixed earth and sand is provided. A bearing (not shown) is provided on each of the upstream side surface 113 and the downstream side surface 114. The rotating shafts 120 and 130 are both supported by bearings at both ends, and are arranged in parallel inside the casing 110 along the casing 110.

  As described above, the paddle 102 is provided on the rotary shafts 120 and 130. The paddles 102 are provided in a plurality of stages while shifting the phase by 90 degrees at a predetermined interval in pairs in the radial direction around the rotary shafts 120 and 130. The surface (scraping surface) of the paddle 102 is rotated by the rotary shafts 120 and 130 so that when the rotary shafts 120 and 130 rotate, the sand and sand are transferred toward the downstream outlet 117 while being stirred and mixed. Inclined with respect to the direction.

  The speed reducer-equipped hydraulic motor 140 is attached to the downstream side of the casing 110, and an output shaft (not shown) is connected to the downstream end of one rotating shaft 120. When the hydraulic motor 140 with a speed reducer is driven in the forward rotation direction, the rotating shaft 120 is driven in the counterclockwise direction when the mixer 100 is viewed from the downstream side (FIG. 2). When the rotating shaft 120 is driven counterclockwise, the other rotating shaft 130 is rotated in the opposite direction (clockwise) to the rotating shaft 120 in synchronization with the rotating shaft 120 by a timing gear (not shown). . In addition, the hydraulic motor 140 with a reduction gear can be driven in a direction (reverse rotation direction) opposite to the above-described normal rotation direction.

  A sediment loading hopper 160 and a soil quality improving material quantitative supply device 180 are attached to the loading port 116. A soil improvement material hopper 170 is attached to the soil improvement material quantitative supply device 180, and the soil improvement material stored in the soil improvement material hopper 170 is quantitatively cut out by the soil improvement material quantitative supply device 180 and input. It is introduced into the mixer 100 through the port 116. Below the discharge port 117, a belt conveyor 200 described later is disposed.

  The movable weir mechanism 150 is substantially perpendicular to the axial direction of the rotation shafts 120 and 130, that is, from the bottom surface 111 and the trough bottom surface 111a to the inside of the casing 110, and from the inside of the trough bottom surface 111a. The weir is movable between the retracted position and the actuator 151 and the weir plate 152. The movable weir mechanism 150 is provided on the downstream side in the vicinity of the inlet 116. The actuator 151 is a hydraulic cylinder in which the rod 151a is expanded and contracted by pressure oil supplied from the outside, and two actuators 151 are provided outside the side surface 112 so as to sandwich the casing 110.

  The dam plate 152 is a plate-like member having a substantially horizontally long rectangular shape that is moved up and down by the two actuators 151, and is attached to the rod 151 a of the actuator 151 below the peripheral edge on the short side. 2A and 2B of the bottom surface 111 of the casing 110 and the trough bottom surface 111a (left and right direction in FIG. 1) are provided with slits 111b and 111c through which the weir plate 152 can enter and exit. ing. Around the slits 111b and 111c, there is provided a seal 190 that allows raising and lowering of the weir plate 152 while preventing earth and sand in the casing 110 from leaking out of the slits 111b and 111c.

  As shown in FIG. 2A, in the state where the rod 151a of the actuator 151 is most contracted, the upper end of the barrier plate 152 is pulled up to the vicinity of the lower part of the rotary shafts 120 and 130. As shown in FIG. 2B, in the state where the rod 151a of the actuator 151 is most extended, the barrier plate 152 is pulled down so that the upper end portion does not protrude inward from the trough bottom surface 111a.

  The belt conveyor 200 is a conveying device for conveying the improved soil 301 generated by the mixer 100 to the discharge yard 400, and is provided with an input chute 201 at one end on the upstream side (FIG. 1). As described above, one end on the upstream side of the belt conveyor 200 is disposed below the mixer 100, and the input chute 201 faces the discharge port 117 of the mixer 100.

---- Improvement of soil with low moisture content ---
When the soil improvement material is mixed with the soil having a low water content, the soil is improved by mixing the soil and the soil improvement material in the same manner as a conventional mixer. That is, the earth and sand and the soil quality improving material are mixed in a state where the barrier plate 152 is pulled down so as not to protrude into the casing 110 (FIG. 2B). Specifically, the soil with a low water content is reformed as follows.

  Sediment having a low water content ratio generated at a construction site or the like is quantitatively introduced into the mixer 100 from the charging port 116 through the sediment loading hopper 160 by a quantitative supply device (not shown) such as a screw feeder or a carry-in conveyor. It is thrown. The soil improvement material is stored in advance in the soil improvement material hopper 170, is quantitatively cut out by the soil improvement material quantitative supply device 180, and is supplied into the mixer 100 through the input port 116. In addition, the mixing ratio of the earth and sand and the soil improvement material is determined as appropriate according to the properties of the earth and sand to be treated, such as the water content ratio, and the supply amount of the quantitative supply device and the cutout amount of the soil quality improvement material quantitative supply device 180 are adjusted as appropriate. Thus, the mixing ratio of the two is kept substantially constant.

  The earth and sand and the soil quality improving material introduced from the introduction port 116 are picked up by the paddle 102 that rotates together with the rotary shafts 120 and 130, stirred, mixed, and transferred toward the downstream discharge port 117. When soil and soil improvement material are mixed, the moisture content of the earth and sand is absorbed into the soil improvement material, and part of the moisture content evaporates due to the reaction heat between the soil improvement material and moisture, resulting in a decrease in moisture content. To do. In addition, the soil and sand are subjected to a polyazone reaction and a carbonation reaction, and an agglomeration effect due to calcium ions in the soil improvement material. The earth and sand are solidified by the mixer 100 in this way to be improved soil 301 and discharged from the discharge port 117. The improved soil 301 discharged from the discharge port 117 is input to the input chute 201, conveyed by the belt conveyor 200, and stocked in the discharge yard 400. The improved soil 301 stocked in the discharge yard 400 is appropriately carried out by a heavy machine or the like.

---- Improvement of soil with high water content ---
Since soil with a high water content is rich in fluidity, the conventional paddle type continuous mixer flows out from the discharge port 117 before it is sufficiently mixed with the soil quality improver, and a high quality improved soil can be obtained. could not. If a conventional paddle-type continuous mixer is used to process sediment with a high water content, a large amount of soil improvement material is put into the mixer before the start of the introduction of soil, and the soil improvement material can be used as a weir. We had to prevent the outflow of earth and sand. However, since the soil improvement material is expensive, the processing cost increases in the processing by the conventional paddle type continuous mixer. Therefore, in general, batch type mixers are used for processing high-moisture content earth and sand. However, in batch type mixers, the volume of earth and sand can be increased unless the volume of the mixer is increased. Can not.

  Therefore, in the earth and sand treatment apparatus according to the present embodiment, the weir plate 152 is protruded inside the casing 110 (FIG. 2A) to prevent the outflow of earth and sand in the initial stage after the start of mixing, thereby continuously mixing. This makes it possible to treat soil with a high water content. Specifically, soil having a high water content is reformed as follows. In addition, in the following description, the difference from the case of the earth and sand improvement with a low moisture content mentioned above is mainly demonstrated.

  Since the sediment having a high water content generated at a construction site or the like has high fluidity as described above, the sediment is introduced into the mixer 100 from the introduction port 116 via the sediment introduction hopper 160 by a fixed supply pump or the like. . The soil quality improving material is input into the mixer 100 from the input port 116 by the soil quality improving material quantitative supply device 180 in the same manner as described above.

  Prior to the start of mixing, as shown in FIG. 2A, the rod 151 a of the actuator 151 is contracted and the weir plate 152 is pulled up to the vicinity of the lower part of the rotary shafts 120 and 130. Thereafter, a predetermined amount of earth and sand and a soil quality improving material are introduced into the casing 110. That is, at the initial stage of the start of mixing, after a predetermined amount of earth and sand and a soil quality improving material are introduced into the casing 110, the introduction of the earth and sand and the soil quality improving material is interrupted. Since the earth and sand thrown in from the insertion port 116 is blocked by the dam plate 152, the paddle 102 rotating together with the rotary shafts 120 and 130 is scraped up with the soil improvement material and sufficiently stirred and mixed. The stirring speed and stirring time in the initial stage of the mixing start, and the rotation direction of the rotating shafts 120 and 130 can be appropriately changed according to the state of soil modification.

  When the sand and the soil quality improver are mixed in the state of being dammed by the dam plate 152, the earth and sand are modified and poor in fluidity. Earth and sand play the same role as the dam plate 152. Therefore, at the stage where the earth and sand blocked by the barrier plate 152 is modified and poor in fluidity, the barrier plate 152 is lowered so as not to protrude into the casing 110 as shown in FIG. In addition, the modified sediment is allowed to move downstream, and the suspended sediment and the quality improvement material are resumed. In the subsequent reforming treatment, since the earth and sand modified inside the casing 110 plays the same role as the dam plate 152, the fixed amount of earth and sand and the soil quality improving material are continuously fed as in the conventional mixer. To improve soil.

  If the mixing process is continued without lowering the barrier plate 152, the earth and sand having poor fluidity may be blocked by the barrier plate 152, causing clogging inside the casing 110. Therefore, as described above, it is desirable to pull down the weir plate 152 when the earth and sand have been modified and the fluidity becomes poor.

In the earth and sand treatment apparatus using the stirring apparatus mentioned above, there exists the following effect.
(1) A paddle-type continuous mixer is protruded from the bottom surface 111 and the trough bottom surface 111a substantially vertically into the casing 110 to prevent the earth and sand from moving downstream. A dam plate 152 that is movable between a retreat position that permits downstream movement is provided. As a result, it is possible to prevent the earth and sand and the soil conditioner from being discharged from the discharge port 117 without being sufficiently mixed. Therefore, even if the moisture content of the earth and sand to be treated is high, the earth and sand and the soil conditioner are sufficiently provided. You can get a high quality improved soil. Since the soil with high water content can be continuously modified, the sediment processing capacity is high. In addition, unlike the case of processing high water content sediment with a conventional paddle type continuous mixer, it is not necessary to add a large amount of soil improvement material into the mixer before starting the introduction of sediment, thus reducing sediment treatment costs. it can.

(2) The dam plate 152 is configured to be movable between a protruding position that protrudes from the bottom surface 111 and the trough bottom surface 111 a substantially vertically into the casing 110 and a retreat position that retreats from the inside of the casing 110. As a result, the high-moisture content soil and sand can be modified using the weir plate 152, and the low-moisture content soil and sand can be continuously removed by lowering the weir plate 152 to the retracted position. Therefore, the range of moisture content of the earth and sand that can be modified is wide and convenient.

(3) The mixer 100 is a container-fixed mixer, and is a horizontal rotary shaft type paddle type continuous mixer in which the rotary shafts 120 and 130 extend in a substantially horizontal direction. Therefore, even if it is earth and sand with high fluidity, the swash plate 152 can prevent the outflow to the downstream. As a result, by adding a simple mechanism such as the movable weir mechanism 150 that raises and lowers the weir plate 152 to a conventional mixer, it is possible to modify the sediment with a wide moisture content, thereby suppressing an increase in manufacturing cost. The mixer 100 can be manufactured at a low cost. In addition, since the operation of the mixer 100 is easy, even an operator who is unfamiliar with the sediment treatment operation can easily treat sediment with a high water content.

(4) Since the dam plate 152 is configured to move in a direction substantially perpendicular to the rotary shafts 120 and 130, the flow of earth and sand that tends to move in parallel with the extending direction of the rotary shafts 120 and 130 It can be effectively dammed up.
(5) Improving soil by mixing with soil improvement material while damming the soil with high water content, and using this improved soil as a substitute for the weir, preventing the soil and soil improvement material from flowing out. The improved soil was continuously produced by stirring and mixing. Thereby, since the sediment with high fluidity can be treated easily and continuously, the disposal cost of the sediment can be reduced.

(6) Since the mixer 100 that stirs and mixes the earth and sand introduced into the casing 110 and mixes the earth and sand is modified, the initial cost and running for the earth and sand treatment are configured. Cost merit is great in terms of both costs.
(7) Since the paddle type mixer 100 is used for the mixing of the earth and sand and the soil conditioner, the earth and sand and the soil conditioner can be mixed efficiently, and the inside of the mixer 100 can be transferred at the same time. A large amount of earth and sand can be processed continuously.

---- Modified example ---
(1) In the above description, the dam plate 152 is configured to be inserted into the casing 110 from below the casing 110 when damming the earth and sand, but the present invention is not limited to this. For example, the barrier plate 152 may be configured to be inserted into the casing 110 from the side of the casing 110.
(2) In the above description, the movable weir mechanism 150 is provided in the vicinity of the downstream side of the inlet 116, but the present invention is not limited to this. The movable weir mechanism 150 can be provided at any position between the vicinity of the downstream side of the input port 116 and the vicinity of the upstream side of the discharge port 117.

(3) In the above description, the paddle 102 is provided in a plurality of stages while shifting the phase by 90 degrees at predetermined intervals one by one in the radial direction around the rotation shafts 120 and 130. It is not limited. The paddle 102 may be provided in a plurality of stages while shifting the phase by a predetermined angle (for example, 90 degrees, 120 degrees, 180 degrees, etc.) one by one in the radial direction around the rotating shafts 120, 130 as a center. In addition, the arrangement position and the number of paddles 102 may be changed as appropriate, for example, a plurality of paddles arranged radially are provided in multiple stages without changing the phase at predetermined intervals.

(4) In the above description, the surfaces (scraping surfaces) of all the paddles 102 are inclined obliquely with respect to the rotation direction of the rotating shafts 120 and 130, but the present invention is not limited to this. For example, part of the paddle 102 that does not have the effect of transporting earth and sand and whose scraping surface faces the rotation direction of the rotary shafts 120 and 130 may be used. In order to promote the mixing with the improving material, the paddle 102 whose scraping surface is parallel to the rotation direction of the rotation shafts 120 and 130 may be partially adopted.

(5) In the above description, the mixer 100 is a paddle type mixer, but the present invention is not limited to this. For example, a mixer having screw-like stirring blades provided with spiral plates on the rotary shafts 120 and 130 may be used. In this case, by notching a part of the stirring blade, interference between the stirring blade and the weir plate 152 when the weir plate 152 protrudes into the casing 110 can be prevented.

(6) In the above description, the earth and sand treatment apparatus 1 is fixedly disposed in the vicinity of an earth and sand generation place such as a construction site, but the present invention is not limited to this. For example, it may be configured as a portable sediment processing apparatus capable of transporting the sediment processing apparatus 1 integrally, or may be configured as an in-vehicle type sediment processing apparatus mounted on a wheel type or crawler type traveling apparatus. .

(7) In the above description, the mixer 100 has two axes. However, the mixer 100 may be a single-axis mixer or a three-axis or more mixer.
(8) In the above description, the processing object of the earth and sand processing apparatus 1 is earth and sand, but the present invention is not limited to this. For example, the present invention can be applied to an application in which a mixture with reduced fluidity is obtained by mixing a slurry having high fluidity with another substance.

(9) In the above description, the speed reducer-equipped hydraulic motor 140 and the actuator 151 are hydraulic devices driven by pressure oil, but other devices such as an electric motor with a speed reducer and a linear cylinder using an electric motor are also available. You may use the apparatus using a power source. Further, the actuator 151 is not limited to a direct acting hydraulic cylinder, and may be an actuator whose output shaft rotates, such as a motor or a rotary actuator. In this case, the rotary motion of the output shaft may be converted into the linear motion of the dam plate 152 by a link mechanism or the like.

(10) In the above description, the mixer 100 is disposed such that the casing 110 is substantially horizontal, but the present invention is not limited to this. For example, the casing 110 may be inclined so that the downstream side is lower than the upstream side. In this case, there is an effect that the carrying capacity of earth and sand is increased. Conversely, the casing 110 may be inclined so that the downstream side is higher than the upstream side. In this case, the effect of preventing sediment outflow is enhanced.

(11) In the above description, the seal 190 is provided around the slits 111b and 111c, but the present invention is not limited to this. The seal 190 may be provided only in one of the slits 111b and 111c. Further, the seal 190 can be omitted in consideration of the properties of earth and sand to be processed and the dimensional accuracy of the slits 111b and 111c and the barrier plate 152. The mixer 100 includes the bottom surface 111 and the arc-shaped trough bottom surface 111a, but may have a structure without the bottom surface 111.

(12) In the above description, the soil quality improving material is used for the soil improvement. However, when the soil having a high water content is modified, a fibrous water absorbing material may be used together with the soil quality improving material.
(13) Each embodiment and modification described above may be combined.

  In the above embodiment and its modifications, for example, the stirring blade and the stirring paddle correspond to the paddle 102, and the weir corresponds to the dam plate 152, respectively. The above description is merely an example, and when interpreting the invention, there is no limitation or restriction on the correspondence between the items described in the above embodiment and the items described in the claims.

It is a figure which shows the whole structure of the earth-and-sand processing apparatus in which the stirring apparatus of this Embodiment is used. 2A and 2B are cross-sectional views taken along the line II-II in FIG. 1, in which FIG. 1A shows a state in which the barrier plate 152 is pulled up, and FIG. 1B shows a state in which the barrier plate 152 is pulled down.

Explanation of symbols

1 Sediment processing equipment 100 Stirrer (mixer)
102 Paddle 110 Casing 120, 130 Rotating shaft 150 Movable weir mechanism 152 Dam plate 200 Belt conveyor 301 Improved soil 400 Discharge yard

Claims (5)

A rotating shaft disposed along the casing in the casing;
A stirring blade disposed on the outer peripheral surface of the rotating shaft and transporting from one side of the extending direction of the rotating shaft to the other while stirring the object to be stirred put in the casing;
It is movable between a protruding position that protrudes into the casing and prevents the object to be stirred downstream, and a retreat position that retreats from the casing and permits the object to be stirred downstream. A stirrer comprising a weir. The stirrer according to claim 1,
The casing and the rotating shaft extend in a substantially horizontal direction. The stirrer according to claim 1 or 2,
The stirring device, wherein the stirring blade is a stirring paddle. Stir and mix while damming so that the predetermined amount of soil containing moisture and the soil conditioner do not flow out to produce improved soil,
After the improved soil is generated, continuous supply of the soil and the soil conditioner is started, and the soil and the soil conditioner are prevented from flowing out by the generated improved soil. A soil treatment method characterized by continuously producing improved soil by stirring and mixing. In the earth and sand processing method of Claim 4,
The earth and sand processing method characterized by producing | generating improved soil using the stirring apparatus as described in any one of Claims 1-3.

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