JP5366652B2 - Soil reforming equipment and soil reforming method - Google Patents

Description

  The present invention relates to a soil modification facility and a soil modification method for modifying soil so that excavated sediment generated by excavation of the ground can be reused.

  Excavation earth and sand generated at tunnel excavation sites, building construction sites, etc. must be disposed of as industrial waste, which is expensive. Therefore, a soil quality improvement technique for reusing the excavated earth and sand as a backing material and a backfill material has been developed.

  For example, Patent Document 1 discloses an agitation and mixing device that uses a stirring blade disposed on a belt conveyor to modify soil quality while agitating and mixing excavated earth and sand conveyed on the belt conveyor. This stirring and mixing device supplies the modifying material for fluidizing the excavated sediment on the upstream side, stirs and mixes while transporting, and fluidizes the excavated sediment.

  Patent Document 2 discloses a treatment facility for modifying soil quality of excavated sediment. As shown in FIG. 5, this treatment facility is a sieving step for sieving while smashing the excavated sediment by injecting water onto the excavated sediment, and removing to remove foreign substances contained in the screened excavated sediment. The process and the mixing process of adding a modifier to the muddy water composed of excavated earth and water and stirring and mixing are set as one cycle, and the excavated earth is fluidized by repeating this multiple times.

Japanese Patent Laying-Open No. 2005-21823 JP 2001-329565 A

  However, since the stirring and mixing apparatus described in Patent Document 1 does not have a function of measuring the weight of the excavated sediment loaded on the belt conveyor, an appropriate amount according to the amount of the excavated sediment loaded on the belt conveyor. Therefore, there is a possibility that excavated soil that is not sufficiently soil-modified is generated.

  If the excavated sediment contains harmful substances, it does not have the function of detoxifying it, so new detoxification equipment must be installed. However, there was a problem that a large site and new capital investment were necessary.

  And in the processing equipment described in patent document 2, in order to measure the capacity | capacitance of the excavation earth and sand contained in a mixer and to supply the predetermined amount of modifiers with respect to the capacity | capacitance of the excavation earth and sand, fluidization processing The work must be batch processing, and there was a problem that processing efficiency was poor.

  Therefore, the present invention has been made in view of the above-described problems, and an appropriate amount of chemical material can be supplied when continuously performing soil modification treatment, detoxification treatment, and fluidization treatment of excavated soil. An object is to provide a soil modification facility and a soil modification method.

The present invention is a soil modification facility for modifying the soil quality so that the excavated soil can be reused by stirring and mixing mud water created from the excavated soil generated by excavating the ground by means of a belt conveyor. And
Thereby creating a mud by mixing the excavated soil and water, and the mud supply means for supplying the muddy water onto the belt conveyor,
Measuring means for measuring the weight before Symbol mud stacked in a predetermined range before Symbol belt conveyor,
A reforming material supply means for supplying a modifier for modifying the pre-Symbol mud,
And harmless material supply means for supplying a harmless material for detoxifying harmful substances contained in the prior SL mud,
Based on the weight of the prior SL mud measured by said measuring means, and control means for adjusting the supply amount of the reforming material and the harmless material is supplied from the reforming material supply means and the harmless material supply means,
It is characterized by providing.

According to the present invention, since a harmless material supply means and the mud supply means and reforming material supply means, it can be treated flowing the drilling sediment. Compared to the case where conventional processing facilities are provided and processing is performed separately, the capital investment cost can be reduced and the processing time can be greatly shortened.

Further, since a measuring means and control means, to supply the mud stacked on the belt conveyor soil reforming, and the modifier and harmless material of optimum amount to harmless Kasho sense Can do. And since a modifier and a detoxification material are stirred and mixed after supplying to muddy water , a modifier and a detoxification material can be distributed uniformly in muddy water . Therefore, a highly reliable modified soil can be created, and harmful substances such as heavy metals, boron, fluorine, volatile organic compounds (VOC), and oil can be reliably rendered harmless.

Since can be carried out continuously flow processing and harmless Kasho sense, you are possible to greatly shorten the processing time compared to conventional batch processing.

  Further, in the present invention, a plurality of the measuring means are provided between the head pulley and the tail pulley of the belt conveyor, and are installed between the guide pulleys that support the conveying belt. The weight loaded in the range between the guide pulleys can be measured.

Further, in the present invention, the reforming material supply means includes a modifier tank for storing the modifier, the modifier for quality material feeder for feeding the modifier before Symbol mud, If the reforming material is provided, the reforming material can be continuously supplied by storing the reforming material in the reforming material storage tank.

Further, in the present invention, the feeder modifier, if any be in accordance with the weight before Symbol muds measured by said measuring means is adjustable to discharge amount of the modifier, between the guide pulleys the modifier of the optimal amount corresponding to the amount of mud water that is loaded can be supplied to.

Further, in the present invention, the harmless material supply means, and one for harmless material tank for storing the harmless material, a nozzle for harmless material for injecting the harmless material prior Symbol mud, By providing the harmless material pump or the harmless material feeder for supplying the harmless material from the harmless material tank, by storing the harmless material in the harmless material storage tank The detoxifying material can be continuously supplied.

Further, in the present invention, the use harmless material pump or harmless material for feeder are that depending on the weight before Symbol muds measured by said measuring means is adjustable to discharge amount of the harmless material if, it is possible to supply the optimum amount of harmless material corresponding to the amount of mud water that is loaded between the guide pulleys.

The present invention is a reforming method for modifying the soil quality of excavated soil using the above-described soil modification equipment,
A muddy water supply step of supplying muddy water prepared by mixing the excavated earth and water onto the belt conveyor;
A weight measuring step of measuring the weight of the muddy water loaded in a predetermined range of the belt conveyor;
Based on the weight of the muddy water measured in the measurement step, a modifying material supply step for supplying a predetermined amount of the modifying material,
Based on the weight of the muddy water measured in the measurement step, a detoxification material supply step for supplying a predetermined amount of the detoxification material,
And a stirring and mixing step of stirring and mixing the muddy water supplied with the modifying material and the detoxifying material.

  According to the present invention, fluidization processing and detoxification processing of excavated earth and sand can be continuously performed.

  According to the present invention, soil modification treatment, detoxification treatment, and fluidization treatment of excavated sediment can be continuously performed, and an appropriate amount of chemicals can be supplied.

1 is an overall schematic diagram showing a soil quality improvement facility according to an embodiment of the present invention. It is a plane sectional view showing a belt conveyor. It is side sectional drawing which shows a belt conveyor. It is a flowchart which shows the construction procedure of the soil modification process using a soil modification facility, a detoxification process, and a fluidization process. It is a figure which shows the conventional processing equipment.

  Hereinafter, a preferred embodiment of the soil reforming facility 1 according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is an overall schematic diagram of a soil reforming facility 1 according to an embodiment of the present invention. 2 and 3 are a plan sectional view and a side sectional view showing the belt conveyor 3, respectively.
As shown in FIG. 1 to FIG. 3, the soil reforming facility 1 loads the excavated earth and sand 2 generated by excavation of the ground on the belt conveyor 3 and then modifies the excavated earth and sand 2 on the upstream side. After supplying materials and detoxifying materials for detoxification, stirring and mixing while transporting to create soil-modified soil, or loading muddy water 22 mixed with excavated soil 2 and water on the belt conveyor 3 In this case, a modifier for fluidizing the mud water 22 is supplied on the upstream side, and the fluidized soil is prepared by stirring and mixing while being conveyed, so that the excavated soil 2 can be reused. .

  First, the soil modification facility 1 as a whole will be described.

  The soil quality improvement facility 1 includes a belt conveyor 3, earth and sand supply means 5 for supplying excavated earth and sand 2 and mud water 22 to the belt conveyor 3, and mud water 22 is prepared by mixing the excavated earth and sand 2 and water. The weight of the muddy water supply means 4 for supplying the mastic water 5, the stirrer 6 for agitating the excavated earth and sand 2 and the muddy water 22 on the belt conveyor 3, and the weight of the excavated earth and sand 2 and the muddy water 22 loaded on the conveyor belt 7 A measuring means 8 for measuring, a modifying material supplying means 9 for supplying a modifying material, a detoxifying material supplying means 10 for supplying a detoxifying material for detoxifying harmful substances contained in the excavated earth and sand 2, and a modification And a control means 31 for adjusting the supply amount of the reforming material and the detoxifying material supplied from the material supplying means 9 and the detoxifying material supplying means 10.

  Next, the structure of the belt conveyor 3 will be described.

  The belt conveyor 3 is provided with a head pulley 11 and a tail pulley 12 at an upstream end and a downstream end, respectively, and a conveyor belt 7 is stretched between the pulleys 11 and 12. Between the pulleys 11 and 12, a plurality of guide pulleys 13 for supporting the conveying belt 7 are provided at a predetermined interval.

  The head pulley 11 is rotationally driven by the driving device 21 to rotate the conveying belt 7 in a predetermined direction, thereby conveying the excavated earth and sand 2 and the muddy water 22.

  The belt conveyor 3 main body is installed in a frame 14 provided so as to surround the main body. And the upper part of the belt conveyor 3 is covered with the lid | cover 15 connected to the frame 14 so that opening and closing was possible. The lid 15 is provided with an inlet for excavating earth and sand 2, mud water 22, a reforming material, and a detoxifying material. Further, the lid 15 is attached with an opening / closing drive device 16 for opening and closing the lid 15, and the lid 15 rotates upward about the hinge 17 by the drive of the opening / closing drive device 16. Since the lid 15 is provided so as to cover the upper part of the belt conveyor 3, it prevents the dust from being diffused by the excavated earth and sand 2 and the muddy water 22.

  Further, plate-like liners 18 for preventing the excavated earth and sand 2 and the muddy water 22 from leaking from the side of the conveying belt 7 to the outside of the belt are respectively attached to both side surfaces of the frame body 14. The liner 18 is made of, for example, a rubber plate, and the lower edge thereof is attached to the upper surface of the conveying belt 7 with an adhesive, and the upper edge is attached to the lid 15 with a bolt or the like. Thereby, leakage of the excavated earth and sand 2 and the muddy water 22 from between the liner 18 and the conveyor belt 7 is prevented, and noise and vibration of the belt conveyor 3 are reduced. In addition, a mortar-shaped receiving tray 33 is provided on the lower surface of the belt conveyor 3 so as not to touch the ground even if the excavated earth and sand 2 and the muddy water 22 leak. The leaked excavated earth and sand 2 and the muddy water 22 are collected through a collecting means 32 made of a steel pipe connected to the lower end of the receiving tray 33, and then a raw material hopper of the earth and sand supply means 5 and a muddy water storage tank 34 of the muddy water supply means 4 (described later). To be sent to.

  A suction device 36 for sucking gaseous volatile organic compounds (VOC), benzene, toluene, xylene, ethyl acetate, and the like is provided at the downstream end of the belt conveyor 3. If the digging earth and sand 2 contain volatile organic compounds, the frame 14 is filled with gaseous volatile organic compounds, which is dangerous. To process.

  Next, the muddy water supply means 4 used when the fluidization process is performed will be described.

  The muddy water supply means 4 includes a muddy water storage tank 34 for creating the muddy water 22, a submersible pump 20 for supplying the muddy water 22, and a muddy water 22 supplied from the submersible pump 20. Feeding means 35 for feeding to the earth and sand supply means 5 and return means 19 for returning the earth and sand supply means 5 to the overflowed muddy water storage tank 34 are provided.

  The excavated earth and sand 2 generated at the construction site is put into a muddy water storage tank 34 and mixed with water to create muddy water 22. The specific gravity of the muddy water 22 is adjusted in the muddy water storage tank 34.

  The produced muddy water 22 is discharged from the submersible pump 20 and supplied to the earth and sand supply means 5 provided at the upstream end of the belt conveyor 3 through a feeding means 35 made of a steel pipe. At this time, the muddy water 22 is appropriately supplied from the muddy water storage tank 34 so that the earth and sand supply means 5 does not become empty. On the other hand, when the earth and sand supply means 5 is full, it is returned to the muddy water storage tank 34 via the return means 19 made of a steel pipe connected to the upper end of the earth and sand supply means 5 so as not to overflow.

  Next, the structure of the stirrer 6 will be described.

  A plurality of agitators 6 are provided at predetermined intervals along the longitudinal direction of the belt conveyor 3. In the following description, the stirrer 6 disposed on the most upstream side is referred to as a first stirrer 6a, and the second stirrer 6b, the third stirrer 6c, and the fourth stirrer in order toward the downstream side. The stirrer 6d, the fifth stirrer 6e, and the sixth stirrer 6f are referred to.

  The stirrer 6 includes a vertical shaft 23 that is rod-shaped and serves as a center of rotation, and a plurality of blades 24 that are attached to the lower end of the vertical shaft 23 so as to protrude from the vertical shaft 23 in the horizontal direction. While rotating as the center, the excavated earth and sand 2 and the muddy water 22 are agitated by the blades 24.

  When the stirrer 6 is rotated, the stirrers 6 adjacent to each other are rotated such that the rotation directions thereof are different from each other. Specifically, when the first stirrer 6a is rotated left (forward rotation), the second stirrer 6b is rotated right (reverse rotation), the third stirrer 6c is rotated forward, and so on. In the manner, the fourth to sixth stirrers 6d to 6f are also rotated. As a result, the excavated earth and sand 2 and the mud water 22 alternately receive forward and reverse agitating forces, and as a result, the excavated earth and sand 2 and the mud water 22 pass through the plurality of agitators 6 and are made harmless. The materials are mixed so that they are uniform.

  Each stirrer 6 is arranged in a position where its vertical shaft 23 is alternately shifted from the central axis parallel to the longitudinal direction of the conveyor belt 7 by a fixed distance to the left and right (up and down in FIG. 2) with respect to the traveling direction. Yes. As a result, when the excavated earth and sand 2 contains foreign matter such as concrete blocks or rocks, the foreign matter is pushed out by the rotation of the blades 24 of the respective stirrers 6, and between the blades 24 and the liner 18. Since it is sent out to the gap formed, it can be easily removed.

  Further, when a foreign object is caught in a gap formed between the blade 24 and the conveying belt 7, the conveying belt 7 is bent between the front and rear guide pulleys 13, and the gap between the conveying belt 7 and the blade 24. Thus, a foreign matter storage space is formed to prevent the blades 24 from being damaged.

  Next, the configuration of the measuring means 8 will be described.

  The measuring means 8 is provided between the guide pulleys 13 at the upstream end of the belt conveyor 3 so as to be in contact with the lower surface of the conveyor belt 7, and the excavated earth and sand 2 and muddy water loaded between the adjacent guide pulleys 13. The weight of 22 is measured. The measuring means 8 is provided on the downstream side of the earth and sand supply means 5. Then, the measurement result is transmitted to the control means 31. In the present embodiment, a load cell is used as the measuring means 8.

  Next, the structure of the modifier supply means 9 will be described.

  The modifier supply means 9 includes a modifier tank 25 for storing the modifier, a modifier hopper 26 for charging the modifier supplied from the modifier tank 25, A feeder 27 is provided at the lower end of the modifier hopper 26 for supplying the modifier. In this embodiment, cement is used as the modifying material.

  The modifier hopper 26 and the feeder 27 are provided on the downstream side of the measuring means 8. The feeder 27 can adjust the supply amount of the modifying material. In the present embodiment, a rotary valve is used as the feeder 27. A predetermined amount of the modifying material is supplied to the excavated earth and sand 2 and the mud water 22 according to the weight of the excavated earth and sand 2 and the mud water 22 measured by the measuring means 8.

  Next, the configuration of the detoxifying material supply means 10 will be described.

  The detoxifying material supply means 10 includes a detoxifying material tank 28 for storing the detoxifying material, a nozzle 29 for injecting the detoxifying material into the muddy water 22, and a detoxifying material from the detoxifying material tank 28. A pump 30 or a feeder for supplying is provided. In this embodiment, the case where the pump 30 is used will be described.

  The detoxifying material is prepared by mixing water with a raw material that can detoxify harmful substances detected by a preliminary survey such as boring. This raw material is appropriately selected according to the detected harmful substances. The target harmful substances are, for example, heavy metals (arsenic, chromium, cadmium, mercury, lead, etc.), boron, fluorine, volatile organic compounds (VOC), benzene, toluene, xylene, ethyl acetate, oil, etc. In the present embodiment, heavy metal arsenic is contained in the excavated earth and sand 2, and iron is selected as a raw material for detoxifying this, and mixed with water to create a detoxified material.

  When a plurality of harmful substances are detected in the excavated earth and sand 2, raw materials capable of detoxifying those harmful substances are selected, respectively, and a plurality of detoxifying materials are created.

  The pump 30 can adjust the discharge amount of the detoxifying material, and supplies a predetermined amount of the detoxifying material to the excavated soil 2 according to the weight of the excavated soil 2 measured by the measuring means 8.

  The content of harmful substances is measured during the preliminary survey, and the content contained per unit volume in the excavated earth and sand 2 is calculated. Based on the calculation result, the detoxification material is supplied to the excavated sediment 2 according to the weight of the excavated sediment 2 or the muddy water 22 measured by the measuring means 8.

  The nozzle 29 is provided on the downstream side of the measuring means 8 and can inject the detoxifying material over a wide range.

  In this embodiment, the feeder 27 for supplying the reforming material and the nozzle 29 for supplying the detoxifying material are provided on the upstream side of the agitator 6, and the modifying material and the detoxifying material are removed from the excavated soil 2 or the muddy water 22. However, the present invention is not limited to this, and the feeder 27 and the nozzle 29 are provided between the adjacent stirrers 6 (for example, between the stirrer 6c and the stirrer 6d) and stirred. You may supply a modifier and a detoxification material in the middle of a process. The supply position of the modifying material and the detoxifying material is appropriately changed according to the reaction rate of the soil quality modifying process, the detoxifying process, the fluidizing process, or the like.

  Next, the configuration of the control means 31 will be described.

  Based on the weight of the excavated earth and sand 2 or the muddy water 22 measured by the measuring means 8, the control means 31 determines the supply amount of the modifying material and the detoxifying material necessary for the soil quality improvement treatment, fluidization treatment and detoxification treatment. Calculate and control the feeder 27 and the pump 30 to adjust the supply amount of the reforming material and the detoxifying material.

  Below, among the soil modification methods using the soil modification facility 1 having the above-described configuration, the soil modification treatment method and the detoxification treatment method will be described first, and then the fluidization treatment method will be applied respectively. Explain according to the procedure.

  FIG. 4 is a flowchart showing a construction procedure of soil modification processing and detoxification processing using the soil modification facility 1.

  As shown in FIG. 4, the soil modification process and the detoxification process are performed after the operation condition setting S <b> 1 of the soil modification facility 1 is performed, and then from the automatic operation start S <b> 10 to the automatic operation end S <b> 100. Steps S30, S33, and S36, which are performed only when creating them, are always performed.

  First, the processing capacity such as the rotation speed of the belt conveyor 3 is set according to the amount of excavated earth and sand 2 generated at the site, and the supply amount kw of the modifying material per unit weight of the excavated earth and sand 2 and the harmless material The operation condition setting step S1 for setting the supply amount fw of the above is performed.

  The supply amount kw of the modifying material is determined by design or the like based on the soil quality of the excavated soil 2 sampled during the geological survey such as boring.

  Further, the supply amount fw of the detoxifying material is determined by design or the like according to the amount of harmful substances contained in the excavated earth and sand 2.

  When the setting of the above operation conditions is completed, automatic operation is started (S10).

  First, a transport belt operating step S20 for rotating the transport belt 7 in a predetermined direction is performed.

  In order to prevent dust from being scattered, after the lid 15 of the belt conveyor 3 is closed, the driving device 21 for rotating the head pulley 11 is driven to rotate the conveyor belt 7.

  Next, the stirrer operation step S25 for rotating the stirrer 6 is performed. The stirrer 6 is rotated so that the rotation directions of adjacent stirrers 6 are different from each other.

  Next, a muddy water charging step S40 is performed in which the excavated earth and sand 2 generated on site is supplied and stored in the raw material hopper as the earth and sand supply means 5, and the excavated earth and sand 2 is continuously dropped onto the conveying belt 7.

  The excavated earth and sand 2 is continuously dropped onto the conveying belt 7 from an opening provided at the lower end of the earth and sand supply means 5.

  Next, the excavated earth and sand weight measuring step S50 for measuring the weight of the excavated earth and sand 2 dropped on the conveyor belt 7 is performed.

  The weight of excavated earth and sand loaded between the guide pulleys 13 of the conveyor belt 7 is measured by the measuring means 8 and this measured value is transmitted to the control means 31. The control means 31 calculates the supply amounts Kw and Fw of the modifying material and the detoxifying material based on the measured values. The calculation methods of the supply amount Kw of the modifying material and the supply amount Fw of the detoxifying material are shown below.

The supply amount Kw of the modifying material is calculated by the following equation (1).
Kw = Dw × kw (1)
Here, Kw: supply amount of the supplied modifier, Dw: measured weight of the excavated soil 2, kw: weight of the modifier supplied to the excavated sediment 2 per unit weight.

Further, the detoxifying material supply amount Fw is calculated by the following equation (2).
Fw = Dw × fw (2)
Here, Fw: the supplied amount of the detoxifying material to be supplied, Dw: the weight of the excavated earth and sand 2 measured, fw: the weight of the detoxifying material to be supplied to the excavated earth and sand 2 per unit weight.

  Based on the result calculated by Formula (1), the modifier supply process S60 which supplies a modifier to the excavation earth and sand 2 is implemented.

  The reforming material feeder 27 is operated to supply the supply amount Kw of the reforming material calculated by the control means 31 to the excavated soil 2. The operation of the reformer feeder 27 is controlled by the control means 31, and only the calculated supply amount Kw is supplied.

  Moreover, the detoxification material supply process S70 which supplies a detoxification material to the excavation earth and sand 2 based on the result calculated by Formula (2) is implemented.

  The pump 30 is operated to supply the detoxifying material of the supply amount Fw calculated by the control means 31 to the excavated soil 2. The operation of the pump 30 is controlled by the control means 31, and only the calculated supply amount Fw is supplied.

  Next, an agitation and mixing step S80 for agitating and mixing the excavated earth and sand 2 supplied with the modifying material and the detoxifying material is performed.

  The excavated earth and sand 2 supplied with the modifying material and the detoxifying material is conveyed from the upstream side to the downstream side of the belt conveyor 3 by the rotation of the conveying belt 7, while the blade 24 is in the position of the first stirrer 6 a. It is stirred by forward rotation and mixed with the reforming material and the detoxifying material. Similarly, the second-stage stirrer 6b that rotates in the reverse direction, the third-stage stirrer 6c that rotates in the forward direction, the fourth-stage stirrer 6d that rotates in the reverse direction, the fifth-stage stirrer 6d that rotates in the forward direction, and the second-stage agitator that rotates in the reverse direction. Each blade 24 agitates and mixes with the reforming material and the detoxifying material in order of the 6-stage stirrer 6f, and the soil is reformed.

  A modified soil discharging step S90 is performed in which the modified soil that has been subjected to soil modification is discharged from the downstream end of the conveying belt 7. The modified soil is transported to the site again and reused.

  The above-described conveyor belt operation step S20 to the modified soil discharge step S90 are continuously performed continuously. Then, for example, the automatic operation is terminated at the end of the day's work (S100).

  Next, the fluidization processing method using the soil modification facility 1 will be described according to the construction procedure.

  In the following description, portions corresponding to the soil modification method and the detoxification method described above are denoted by the same reference numerals, description thereof is omitted, and differences are mainly described.

  Again, as shown in FIG. 4, the fluidization process is performed by always performing the steps from the automatic operation start S <b> 10 to the automatic operation end S <b> 100 after performing the operation condition setting S <b> 1 of the soil reforming facility 1.

  First, as described above, the processing capacity such as the rotational speed of the belt conveyor 3 is set according to the amount of excavated earth and sand 2 generated at the site, and the supply amount kw of the modifier per unit weight of the muddy water 22 is set. And the operating condition setting process S1 which sets the supply amount fw of a detoxification material is implemented. Hereinafter, the method for supplying the detoxifying material is the same as the method described above, and thus the description thereof is omitted.

  When the setting of the operation conditions is completed, automatic operation is started (S10), and the conveying belt operation step S20 and the stirrer operation step S25 are performed.

  In parallel with the above-described steps S1, S10, S20, and S25, the sieving step S30 for sieving the excavated earth and sand 2 generated on site and removing a lump of a predetermined size or larger is performed.

  Next, the muddy water preparation step S33 is performed in which the excavated earth and sand 2 that has been sieved and adjusted in particle size is put into the muddy water storage tank 34 and mixed with water to produce muddy water 22 having a predetermined specific gravity and a predetermined viscosity.

  The produced muddy water 22 is constantly stirred and mixed by the stirrer 22 to maintain a constant specific gravity and viscosity. In addition, you may mix an admixture as needed.

  Next, the muddy water supply process S36 for supplying the muddy water 22 in the muddy water storage tank 34 to the earth and sand supply means 5 is performed. The muddy water 22 is continuously supplied into the earth and sand supply means 5 through the feeding means 35 by the submersible pump 20 installed in the muddy water storage tank 34.

  Next, a muddy water charging step S40 for continuously dropping the muddy water 22 in the earth and sand supply means 5 onto the conveying belt 7 is performed.

  The muddy water 22 is continuously dropped onto the conveyor belt 7 from the opening provided at the lower end of the earth and sand supply means 5.

  Next, a muddy water weight measuring step S50 for measuring the weight of the muddy water 22 dropped on the conveyor belt 7 is performed.

  The measuring unit 8 measures the weight of the muddy water 22 loaded between the guide pulleys 13 of the conveying belt 7 and transmits the measured value to the control unit 31. Based on this measurement value, the control means 31 calculates the supply amount Kw of the reforming material and the supply amount Fw of the detoxifying material by the equations (1) and (2) as described above.

  And based on the result calculated by Formula (1) and Formula (2), the reforming material supply process S60 and the detoxification material supply process S70 which supply a modifier and a detoxification material to the muddy water 22 are implemented.

  Next, an agitation and mixing step S80 for agitating and mixing the muddy water 22 supplied with the modifying material and the detoxifying material is performed. The muddy water 22 supplied with the modifying material and the detoxifying material is stirred and mixed by the stirrer 6 while being transported from the upstream side to the downstream side of the belt conveyor 3 by the rotation of the transport belt 7, and is subjected to soil modification.

  A modified soil discharging step S90 is performed in which the modified soil that has been subjected to soil modification is discharged from the downstream end of the conveying belt 7. The fluidized soil created by soil modification is transported to the site again and reused.

  The above-described conveyor belt operation step S20 to the modified soil discharge step S90 are continuously performed continuously. Then, for example, the automatic operation is terminated at the end of the day's work (S100).

  In addition, in performing the fluidization process of this embodiment, although the case where the excavation earth and sand 2 were mixed with water was demonstrated, it is not limited to this, and the case where the excavation earth and sand 2 is a muddy state containing much water May be put into the sediment supply means 5 without providing the muddy water storage tank 34. However, it is necessary to sample the muddy soil 2 in advance, measure the specific gravity, and calculate the supply amount kw of the modifying material per unit weight and the supply amount fw of the detoxifying material per unit weight. It is.

  According to the above-described embodiment, the soil modification facility 1 includes the modifier supply means 9, the detoxification material supply means 10, and the muddy water supply means 4. Quality treatment, detoxification treatment, and fluidization treatment can be performed. Compared to the case where conventional processing facilities are provided and processing is performed separately, the capital investment cost can be reduced and the processing time can be greatly shortened.

  Further, since the measuring means 8 and the control means 31 are provided, it is possible to supply optimal amounts of the modifying material and the detoxifying material to the excavated earth and sand 2 and the muddy water 22 loaded on the conveying belt 7. And since a modifier and a detoxification material are stirred and mixed after supplying to the excavation earth and sand 2 and the muddy water 22, it can be distributed uniformly in the excavation earth and sand 2 and the muddy water 22. Therefore, highly reliable modified soil can be created and harmful substances can be reliably rendered harmless.

  And since a soil improvement process, a detoxification process, and a fluidization process can be implemented continuously, process time is shortened significantly compared with the conventional batch process.

  Further, since the reforming material supply means 9 includes the reforming material tank 25 and the feeder 27, the reforming material can be continuously supplied. Further, since the detoxifying material supply means 10 includes the detoxifying material tank 28, the nozzle 29, and the pump 30, the detoxifying material can be continuously supplied.

DESCRIPTION OF SYMBOLS 1 Soil modification equipment 2 Excavation sand 3 Belt conveyor 4 Muddy water supply means 5 Sediment supply means 6 Stirrer 7 Conveyor belt 8 Measuring means 9 Reformant supply means 10 Detoxification material supply means 11 Head pulley 12 Tail pulley 13 Guide pulley 14 Frame 15 Lid 16 Opening / closing drive device 17 Hinge 18 Liner 19 Return means 20 Submersible pump 21 Drive device 22 Mud water 23 Vertical shaft 24 Blade 25 Reformer tank 26 Reformer hopper 27 Feeder 28 Detoxification tank 29 Nozzle Reference Signs List 30 Pump 31 Control means 32 Collection means 33 Dish 34 Muddy water storage tank 35 Feed means 36 Suction device 37 Stirrer

Claims (7)

A soil modification facility for modifying the soil so that the excavated soil can be reused by stirring and mixing the muddy water created from the excavated soil generated by excavation of the ground with a belt conveyor,
Thereby creating a mud by mixing the excavated soil and water, and the mud supply means for supplying the muddy water onto the belt conveyor,
Measuring means for measuring the weight before Symbol mud stacked in a predetermined range before Symbol belt conveyor,
A reforming material supply means for supplying a modifier for modifying the pre-Symbol mud,
And harmless material supply means for supplying a harmless material for detoxifying harmful substances contained in the prior SL mud,
Based on the weight of the prior SL mud measured by said measuring means, and control means for adjusting the supply amount of the reforming material and the harmless material is supplied from the reforming material supply means and the harmless material supply means,
A soil reforming facility characterized by comprising: The measuring means includes
2. The soil modification facility according to claim 1, wherein a plurality of the pulleys are provided between a head pulley and a tail pulley of the belt conveyor, and are installed between guide pulleys that support a conveyor belt. The modifying material supply means includes
A tank for modifying material for storing the modifying material;
Soil reforming facility according to claim 1 or 2, characterized in that and a feeder modifier for supplying the modifier before Symbol mud. The modifier for feeder, soil reforming according to claim 3, characterized in that in accordance with the weight before Symbol muds measured by said measuring means is adjustable to discharge amount of the modifier Facility. The detoxifying material supply means includes
A tank for detoxification material for storing the detoxification material,
A nozzle harmless material for injecting the harmless material prior Symbol mud,
The soil reforming facility according to claim 1, further comprising a harmless material pump or a harmless material feeder for supplying the harmless material from the tank for harmless material. The feeder harmless material pump or harmless material, according to claim 5, characterized in that in accordance with the weight before Symbol muds measured by said measuring means is adjustable to discharge amount of the harmless material The soil quality improvement equipment described in 1. In the soil modification method for modifying the soil quality of excavated sediment using the soil modification facility according to any one of claims 1 to 6,
A muddy water supply step of supplying muddy water prepared by mixing the excavated earth and water onto the belt conveyor;
A weight measuring step of measuring the weight of the muddy water loaded in a predetermined range of the belt conveyor;
Based on the weight of the muddy water measured in the measurement step, a modifying material supply step for supplying a predetermined amount of the modifying material,
Based on the weight of the muddy water measured in the measurement step, a detoxification material supply step for supplying a predetermined amount of the detoxification material,
And a stirring and mixing step of stirring and mixing the muddy water supplied with the modifying material and the detoxifying material.

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