JP5207393B2 - Waste mud regeneration processing apparatus and regeneration processing method - Google Patents

Description

  The present invention relates to a waste mud regeneration processing apparatus and a regeneration processing method suitable for regenerating and manufacturing waste mud generated at ground improvement, construction sites, etc. as fluidity improved soil according to target strength and application conditions.

  As measures for preventing ground liquefaction and ground subsidence, there are a compression (consolidation) method using sand and the like, and a solidification method by injecting a solidifying material such as cement. Among these, in the solidification method, for example, there is a configuration in which cement-based milk is jetted at high pressure from a nozzle provided on the shaft tip side while being pulled out after penetrating the stirring shaft. In this high-pressure injection system, cement-based milk is injected together with compressed air, so that a grounding action is also added to the ground, and a high-quality improved pile can be formed that is easily mixed uniformly. By the way, in a high-pressure injection system, muddy water or the like is pushed up to the ground surface along the axis of the stirring shaft by the air lift action of compressed air. Since this mud contains cement-based milk, it must be collected as waste mud. This waste mud varies greatly depending on the diameter and length of the pile whose properties are to be created. The waste disposal cost may be more than 20% of the construction cost, which increases the cost.

  As a method of collecting the waste mud, the discharged mud is usually collected and transported by a vacuum vehicle or a combination of a pump and a dumper and stocked in a temporary processing plant owned by an industrial waste disposal contractor. Then, it is reused by water treatment or discharged into rivers, etc., and solidified material is thrown into the remaining mud and used as landfill material. However, in this configuration, in addition to the transportation cost, a wide processing facility is required, and it takes time to settle and separate the sediment component in the discharged mud. Therefore, in the conventional technology, as exemplified in Patent Documents 1 to 3, there is a configuration in which a fluidity-improving soil having increased strength is obtained by adding a solidifying material or the like to the target waste mud. The configuration of Patent Document 1 is intended for clay-based residual soil and crushed mud soil, uses a vertical kneading tank, throws the residual soil and the like from the upper chute, supplies the solidified material through a stirring shaft in the kneading tank, Mix until it reaches the bottom and process into premix material. In the configuration of Patent Document 2, a supply pipe is arranged between a muddy water production section and a transport vehicle or a driving section, and a kneader and an introduction section connected to the front side of the supply pipe are provided on the discharge side of the supply pipe. The muddy water from the muddy water production section is pumped through the supply pipe, the solidified material is pumped from the introduction section into the pipe, and is mixed with the mud water through the kneader and discharged to the transport vehicle and the placing section.

  On the other hand, the configuration of Patent Document 3 has been developed by the present inventors in order to solve the following problems of Patent Documents 1 and 2. In other words, in the configurations of Patent Documents 1 and 2, the vertical kneading tank is mixed by a rotating agitating blade or mixed by a kneader connected to a supply pipe, so that stable operation is difficult to maintain, and the processing amount is high. If it increases, the property of the improved soil produced will become easy to vary. Assuming that the waste mud to be treated is generated by ground improvement accompanied by pile construction, the waste mud generated at the time of intrusion has a large amount of moisture, and the waste mud produced at the time of pile construction is made of an additive such as cement. Because of this, the viscosity becomes high, that is, the properties of the waste mud are very different, and the waste mud often contains stones and glass. This is because it will be difficult to maintain and the operating rate will deteriorate.

  Therefore, Patent Document 3 uses a simple mechanism to separate the moisture in a state where the waste mud is placed in the tank, and to make it possible to reliably manufacture fluidity-improved soil according to the target strength and application conditions, or to clarify the mechanism. This eliminates the possibility of failure. In other words, this regeneration processing apparatus includes a mixing tank and a backhoe, and the mud put into the mixing tank can be removed from the mud by separating the muddy water from the waste mud, or from outside the mixing tank by operation via the backhoe. Assuming that the waste mud and additives in the tank are mixed, the mixing tank is divided into a first tank and a second tank through a partitioning section, and the partitioning section is divided into each tank. It is formed in a state where it rises in a curved shape from the bottom surface and the curved top portions are joined together. Moreover, this processing method uses the said apparatus, the waste mud injection | throwing-in process which introduces waste mud to the 1st tank side of a mixing tank from a transport vehicle etc., and the waste mud of the 1st tank to a 2nd tank with a backhoe. Along with the transfer operation, a large amount of mud soil with a large specific gravity is collected on the second tank side, and a small specific gravity mud is collected on the first tank side, and the upper muddy water and the lower layer sink on the first tank side. A muddy water removal process that separates the mud that is an ingredient and removes the upper layer muddy water out of the tank, and a calculation process that measures the total amount of mud remaining in the mixing tank and calculates the total amount of additive according to the total amount The mixing step of mixing the mud and the additive with the backhoe in the mixing tank is performed.

Japanese Patent No. 3150453 Japanese Patent No. 3605709 JP 2008-202273 A

  In the configuration of Patent Document 3 above, a mixing tank is installed in the ground improvement area or construction site, and by using a backhoe that is used or prepared on the site, only mud from the mud put into the mixing tank is put into the tank. Remaining, adding additives according to the mud, mixing efficiently by the operation of the backhoe, and easy to manufacture the fluidity improved soil without fear of failure, but still has problems from the following points .

(1) The mixing tank is divided into two tanks, a first tank and a second tank, for storing mud, and a tank for sedimentation. Therefore, the operation for separating muddy water from the discharged mud is uniform. Since the target waste mud is assumed to be put into the mixing tank from the transporter, a door must be provided on a part of the mixing tank so that it can be opened and closed, and once depending on the nature of the mud. Even if it tried to change the amount of processing, it was difficult to deal with it accurately.
(2) Removal of muddy water is based on the premise that the upper layer muddy water settled and separated in the mixing tank is transferred to the outside of the tank by a pump that is a recovery device. The upper layer muddy water that settled and separated during the transfer between the tank and the second tank could not be transferred to the outside of the tank. In short, in the muddy water removal process, the pump can be operated only after the pump is placed in the tank, and after the pump is placed in the tank, the waste mud is transferred between the first tank and the second tank by the backhoe. Because it became difficult, it lacked flexibility.
(3) The introduction of the additive is disclosed by using an auxiliary mixer and preliminarily mixing the mud transferred from the mixing tank and the additive, and then returning it to the mixing tank. Since it is performed at a location away from the mixing tank, it is bothered by conveyance and management.

  The present invention solves the above problems, and its purpose is to perform waste mud regeneration processing according to the target strength and application conditions by adapting to the properties of the waste mud, even if further simplification is achieved. An exhaust mud regeneration processing device and a regeneration processing method are provided.

  In order to achieve the above object, the present invention of claim 1 has a mixing tank in which the inside of the tank is partitioned into a plurality of tank parts via partition parts, and the waste mud generated by ground improvement or the like is mixed with the mixing tank. Settling separation into upper layer mud and lower layer mud in the tank with the operation of transferring the mud of the predetermined tank to other tanks by backhoe, among the multiple tanks of the tank Then, in the waste mud regeneration processing apparatus that removes the upper layer mud from the tank to adjust the water content and mixes additives to produce fluidity-improved soil, it is disposed near one end in the longitudinal direction of the mixing tank. The backhoe, and an additive supply device that is provided in the vicinity of the other end in the longitudinal direction of the mixing tank, and that is near one side along the longitudinal direction of the mixing tank. The provided waste mud storage tank for storing the generated waste mud, and the length of the mixing tank And a mud reservoir for storing the upper layer of muds the sedimentation provided near the other side along the direction. At the same time, the backhoe can transfer the mud of the waste mud storage tank to the mixing tank, and can transfer the upper layer muddy water settled and separated in the mixing tank to the mud water storage tank. The solidifying material tank containing a solidifying material such as cement as the additive and an auxiliary material tank containing auxiliary material such as a strength promoting material, and depending on the total amount of mud remaining in the mixing tank, the solidifying material tank Alternatively, a necessary amount of the solidified material or a necessary amount of the solidified material and the auxiliary material can be charged into the mixing tank from the auxiliary material tank.

  In the present invention described above, the mixing tank only needs to be partitioned into a plurality of tank parts via the partitioning part in the tank, but for example, when the mixing tank is divided into three parts as in the form, The tank part can be used as a tank for storing mud, and the other two tank parts can be used as a tank for settling and separating waste mud and a tank for mainly storing muddy water. For this reason, it is preferable that the mixing tank is divided into three or more tank parts. Waste mud is a mud that can be separated into a muddy water side with a small specific gravity and a mud side with a large specific gravity by natural sedimentation. The “construction sludge” defined in the Technical Standards for Construction Sludge Treatment Soil Including. Mud and muddy water contain sand, pebbles, glass, etc. in a common sense in addition to soil and water.

The present invention as described above is more preferably embodied as in claims 2 and 3. That is,
(1) The additive material supply device is connected to a load measuring means for each tank that independently measures the solidified material tank and the auxiliary material tank, and one end side is connected to the lower discharge portion of each tank via an on-off valve. And the other end side has a screw transfer means opened in the mixing tank (claim 2).
(2) The plurality of tank parts are provided so that the height of the partition part or / and the height of the tank bottom face are different, so that the waste mud settles and separates the upper muddy water into one tank part. It is the structure which is easy to flow out from the other tank part. It is the structure characterized by the above (Claim 3).

  On the other hand, the method of the present invention of claim 4 collects waste mud generated by ground improvement, etc., adjusts the water content of the waste mud, and then mixes additives to produce fluidity improved soil. In the treatment method, using the waste mud regeneration processing apparatus according to any one of claims 1 to 3, the waste mud for transferring the waste mud in the waste mud storage tank to the predetermined tank part of the mixing tank by the backhoe. Along with the operation of transferring the waste mud from the predetermined tank part to the other tank part by the backhoe, the tank part storing a lot of mud with a large specific gravity, the mud water with a small specific gravity and the upper layer mud water and the lower layer After dividing into the tank part to be separated into mud that is a sediment component, the muddy water removing step of transferring the upper layer mud water to the mud storage tank by the backhoe, and measuring the total amount of mud remaining in the mixing tank, The input amount of the additive corresponding to the total amount of mud is And the additional material introduced feeding into the mixing chamber from the pressurized material supply device is characterized by going through a mixing step of mixing until stirring of the target by the backhoe and the additive material and the mud in the mixing tank.

  In addition, in the above additive addition process, the total amount of mud is, for example, a volume scale in each tank part from the bottom to the top, and the scale is measured and the mud accumulated in each tank. Either a method of obtaining the total by adding the amounts or a method of obtaining the weight by mixing the weight of the mixing tank from the total weight of the mixing tank and the amount of mud accumulated in each tank using a weighing scale may be used. Moreover, in the former, it is preferable to convert into the total weight of the mud in a tank from the total capacity of the mud and the average density of the mud.

  In each invention of Claims 1 and 4, in addition to the mixing tank and the backhoe, the additive material supply device, the waste mud storage tank, and the mud water storage tank are configured as a set. The process, muddy water removal process, and mixing process can be accurately operated. Further, since the additive supply device is located at the position farthest from the backhoe in the periphery of the mixing tank, it does not get in the way, and the solidifying material and auxiliary material can be directly put into the mixing tank.

  That is, in each invention, since the mixing tank does not require a door as in Patent Document 3, it can be simplified, and in the mud addition process, it is easy to change the amount of processing at one time while grasping the properties of the mud. Since the pump is not used in the muddy water removal process, it can be performed immediately at an appropriate time. In the mixing step, the solidifying material and the auxiliary material can be introduced efficiently by the additive material supply device. Moreover, in the invention of claim 4, the same backhoe or the operator of the backhoe performs the waste mud charging process, the muddy water removing process, the additive charging process, and the mixing process in order, so that there is no waiting time, It can be operated accurately and efficiently according to the properties.

  In the invention of claim 2, as the additive supply device, load measuring means for each tank for measuring the solidified material tank and the auxiliary material tank independently, one end side is connected to the lower discharge part of each tank via an on-off valve Since the other end side has a screw transfer means that is open in the mixing tank, the amount of solidification material or the addition amount of the solidification material and auxiliary material is set automatically in the mixing tank. Can be easily implemented.

  In the invention of claim 3, since each tank part is provided so that the height of the partition part and / or the height of the tank bottom is different, the waste mud settles and separates the upper layer muddy water from one tank part. It becomes easy to flow out to the other tank part, and more optimal operability can be realized depending on the properties and the processing amount of the mud.

It is an explanatory schematic diagram showing the overall flow of the method of the present invention. It is a top view which shows the waste mud reproduction | regeneration processing apparatus of this invention. It is the model side view which cut only the mixing tank of the waste mud reproduction | regeneration processing apparatus of FIG. It is sectional drawing which shows the turning locus | trajectory of the bucket of a backhoe in a stirring tank. It is a model top view of an additive supply apparatus. FIG. 6 is a schematic side view of the apparatus of FIG. 5. It is the schematic diagram which looked at the apparatus of FIG. 5 from the arrow A direction. (A) is a schematic cross section along the BB line of the apparatus of FIG. 5, (b) is a schematic partial cross section along the CC line of the apparatus of FIG. It is a flowchart which shows the automatic injection | pouring operation example of an additive supply apparatus.

  Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In this description, the overall outline, the waste mud regeneration processing device, and the processing method using the same will be described in detail.

(Summary) FIG. 1 schematically shows the entire plant configuration including wastewater generated by the ground improvement method as a processing target and including related facilities for ground improvement as an application example of the apparatus and the processing method of the present invention. is there. In the figure, the site of the ground improvement area (the entire paper is regarded as the site) is, for the time being, adjacent to the ground improvement work area 1, the reclaim work area 2 provided in a part of the site, and the reclaim work area 2. The fluidity reclaimed treated soil that has been regenerated in this way is partitioned into a storage section 3 for temporarily storing it.

  In the ground improvement work zone 1, a construction machine 10 is installed, and a cement milk production plant 11, a water tank 12, and the like are attached. Although the construction machine 10 is schematically illustrated, it is a mechanism that penetrates and pulls out while rotating the stirring shaft 14. In connection with the agitation shaft 14, as shown in Japanese Patent No. 3389527, a piping unit that feeds cement milk along with the compressed air along with the compressed air, and a discharge unit and a nozzle connected to the lower side of the piping unit (This is referred to as the first configuration), or as shown in Japanese Patent No. 3416774, connected to the supply pipe and the lower side of the pipe section for sending cement milk and compressed air independently along the stirring shaft. And a mixing ejector (this is referred to as a second configuration) for injecting cement milk with compressed air.

  The cement milk production plant 11 produces cement milk from cement and water. And in pile creation by the construction machine 10, the manufactured cement milk is jetted with compressed air into the ground through a swivel joint (not shown) provided on the upper side of the stirring shaft 14, the first configuration or the second configuration. Then, it is mixed with the in-situ soil and formed as an improved pile along with the extraction of the stirring shaft 14. Further, in the cement milk manufacturing plant 11, water collected from the waste mud to be treated, which will be described later, is stored in the water storage tank 12 as drilling water. For example, the drilling water penetrates the stirring shaft 14 into the ground. In the process, the high pressure pump 13, the swivel joint described above, and the supply pipe in the stirring shaft 14 are pumped and ejected into the ground. In the above pile formation, the compressed air is lifted to the ground side along the axis of the stirring shaft 14 as mud containing mud and cement milk by the air lift action, and the improved pile is created on the ground side of the ground E It is temporarily stored in a pot place 15 provided in the vicinity in advance. The temporarily stored waste mud is collected in the vacuum tank type collection vehicle 4 and transferred to the waste mud storage tank 20 installed in the regeneration treatment area 2. In other words, in this example, the collection vehicle 4 reciprocates between the improved work area 1 and the regeneration work area 2.

  In the regeneration work area 2, a backhoe 5, a waste mud storage tank 20, a mixing tank 21, a muddy water storage tank 22, and an additive supply device 24 are provided as a set. After moving to the predetermined tank part of the mixing tank 21, the waste mud put in the mixing tank 21 is settled and separated, and the muddy water of the upper layer is moved to the muddy water storage tank 22, after removing the muddy water from the discharged mud in the mixing tank 21. An operation of mixing and stirring the mud and the additive added from the additive supply device 24 and an operation of transferring the reclaimed soil produced in the mixing tank 21 to the storage area 3 are performed. In addition, the reclaimed soil piled up in the preservation area 3 is cured for a predetermined period and then transferred to the general-purpose dump truck 6 so that it can be transported to the site or another construction area outside the site for effective use. It has become. However, the storage area 3 may be omitted. In that case, for example, among the plurality of tank sections that divide the inside of the mixing tank 20 to be described later, an arbitrary tank section can be used as a temporary storage section for the manufactured reclaimed processing soil and loaded into the dump truck 6 from there. preferable.

(Drainage regeneration processing apparatus) The waste mud regeneration processing apparatus shown in FIGS. 2 to 4 includes the backhoe 5, the waste mud storage tank 20, the mixing tank 21, the mud water storage tank 22, and the additive supply apparatus 24 as described above. It is configured as. In this example, the waste mud storage tank 20, mixing tank 21, mud water storage tank 22, and additive supply device 24, excluding the backhoe 5, can be loaded on a large truck or the like as a single package and transported to the construction site. Is set to In addition, the characteristic of this device structure is that the mixing tank 21 is located in the center, is around the mixing tank 20, and the waste mud storage tank 20 is provided near one side along the longitudinal direction of the mixing tank 21, The muddy water storage tank 22 is provided in the vicinity of the other side along the longitudinal direction of the mixing tank 21, the backhoe 5 is disposed near one end in the longitudinal direction of the mixing tank 21, and the additive supply device 24 is disposed in the longitudinal direction of the mixing tank 21. It is arranged near the other end.

  Here, the backhoe 5 is an existing one, and an operation chamber 5a provided at the upper part of the caterpillar traveling type base machine, a movable first arm 5b, a second arm 5c, and a second arm operated in the operation chamber 5a. A bucket 5d is connected to the front end side of 5c via a hinge shaft. The first arm 5b is pivotally supported so as to be tiltable with respect to the front portion of the caterpillar traveling base machine, and is tilt-adjusted by a hydraulic cylinder. The second arm 5c is pivotally supported so as to be tiltable with respect to the distal end side of the first arm 5b, and is tilt-adjusted by a hydraulic cylinder. The bucket 5d is pivotally supported via a support shaft with respect to the distal end side of the second arm 5c, and is tilted and adjusted by a hydraulic cylinder.

  The mud storage tank 20 has a simple tank structure with an upper opening, and is a tank for temporarily storing the mud generated in the ground improvement work area 1. In addition, the waste mud discharged by the construction of the improved pile described above depends on the ground, construction method, operating conditions, and specifications of the improved pile, such as those with a lot of moisture, those with a lot of moisture, those with a lot of solidified material, and those with a small amount. It changes a lot. Therefore, in this structure, the waste mud generated in the ground improvement work area 1 is not directly put into the mixing tank 21 but is once stored in the waste mud storage tank 20, so that the waste mud to be processed for each batch in the mixing tank 21 is stored. The properties, that is, the total waste mud that is regenerated at one time, was made uniform as it was, so that the work procedure and work time did not vary much between batches.

  The mixing tank 21 is made of a combination of steel plates and is a rectangular box container with an upper opening, and the inside of the tank is partitioned into three tank parts 21a, 21b, 21c via partition parts 23a, 23b. ing. As for each tank part 21a-21c, while the bottom face is formed in the substantially circular arc shape by the cross section, the partition parts 23a and 23b become cross-sectional mountain shape or cross-sectional substantially triangular shape by the circular-arc-shaped standing part of both sides. As inferred from the schematic diagram of FIG. 4, these shapes make it easier to scoop the mud and the like into the bucket by moving the bucket 5 d of the backhoe 5 along the inner surface of each tank. Further, as shown in the partially enlarged view of FIG. 4, a bounce prevention plate 21 f inclined toward the inside of the tank is attached to each upper edge of the tank part 21 a and the tank part 21 c, and the backhoe 5 is stirred. Operation prevents muddy water from splashing out of the tank.

  As for each tank part 23a-23c, the inner surface of both sides becomes a vertical surface, The capacity | capacitance scale (not shown) is attached | subjected to the vertical surface upward from the bottom face. For this reason, in this structure, the amount of mud and the amount of mud accumulated in the tank portions 23a to 23c can be understood by looking at the capacity scale. In this example, of the tank parts 21a to 21c, the tank part 21a closest to the additive supply device 24 is used as an additive supply chamber, the intermediate tank part 21b is used as a main stirring and mixing chamber, and the tank part is close to the backhoe 5. 21c is set as a muddy water (water) recovery chamber. However, the usage of each tank part is arbitrary, and the number of tank parts may be 3 or more.

  Moreover, the height of the partition parts 23a and 23b is formed so that one is higher than the other. In this example, the partition part 23a that partitions the tank part 21a and the tank part 21b is provided higher than the partition part 23b that partitions the tank part 21b and the tank part 21c. When it is transferred to another tank part, the upper layer muddy water easily flows out from the tank part 21b to the tank part 21c over the partition part 23b having a low height. Specifically, for example, in FIG. 3, when the upper layer muddy water portion settled and separated in the mud of the tank portion 21 a is transferred to the intermediate tank portion 21 b by the backhoe 5, the highly fluid muddy water overflows the partition portion 23 b. This is an action that facilitates flow into the tank portion 21c. As another configuration for obtaining such an action, although not shown, the heights of the tank portions 21a to 21c are different.

  The muddy water storage tank 22 has a tank structure with an upper opening, and is a tank for temporarily storing the upper layer muddy water settled and separated in the mixing tank 21. Further, the muddy water storage tank 22 is provided in a state substantially opposed to the waste mud storage tank 20 with the mixing tank 21 interposed therebetween. The muddy water collected in the muddy water storage tank 22 is transferred to the classification tank 16 provided at an appropriate location as shown in FIG. In the classification tank 16, the muddy water is classified by filtration or precipitation, and the recycled water after classification is transferred to the water storage tank 12 via a pipe and a pump 18. However, if the reclaimed water after classification is generated in large quantities, it may be discharged into the river by performing a predetermined PH treatment or the like. The mud water storage tank 22 of the present invention may be a simple tank for accumulating mud water, but may have a tank structure for classifying mud water like the classification tank 16 by filtration or precipitation.

  As shown in FIGS. 2 and 3, the additive supply device 24 includes a rectangular tank 26 supported inside a rectangular frame 25, a cylindrical tank 27 having a smaller capacity, A horizontal screw transfer means 28 communicating with the lower part of the tanks 26 and 27, a vertical screw transfer means 29 standing at the conveying end of the screw transfer means 28, and an upper end of the screw transfer means 29 are connected and discharged. And a tilting discharge chute 30 having an end directed into the stirring tank 21. The rectangular tank 26 is filled with powder cement, and the cylindrical tank 27 is filled with an auxiliary material such as a strength accelerator.

  5 to 8 show the detailed structure of the additive supply device 24. Each of the rectangular tank 26 and the cylindrical tank 27 has a hopper shape with the lower part squeezed, and is supported in a suspended state via a plurality of load cells 31 inside the frame 25 (25a, 25b), respectively, and its lower end is an open / close valve. It is connected to the supply port of the horizontal screw transfer means 28 through certain butterfly valves 32 and 33. The supply port of the horizontal screw transfer means 28 and the discharge ports of the tanks 26 and 27 are cut off at the edges, and the outer periphery of the connection portion is covered with the shielding cylinder 34a or the shielding cylinder 34b and the elastic plate 34c. .

  Among these, the drive motor M of the load cell 31, the opening / closing mechanism of the butterfly valves 32, 33, the horizontal screw transfer means 28 and the vertical screw transfer means 29 is used as an input amount setting means provided at an appropriate position of the device 24. It is connected to the control unit 35. The control unit 35 executes, for example, the control procedure shown in FIG. 9 based on the discharge amount setting data received via the wireless receiver 36, and drives each unit to set the amount of cement or cement. And the auxiliary material is discharged into the mixing tank 21. The transmission source of the setting data is the operator of the backhoe 5 and the operator visually checks the mud put into the mud storage tank 20 and the fluidity of the mud after the mud removal in the mixing tank 21. Based on the visual result, target strength, planned application, etc., the amount of addition is determined, or the respective set values are determined based on the measured slump flow value of the corresponding sludge in advance. The setting data is transmitted through a transmitter provided in the chamber 5a.

(Regeneration processing method) A specific waste mud regeneration processing method using the above-described waste mud regeneration processing apparatus will be described below. In this regeneration processing method, by operating the backhoe 5, the waste mud charging process for transferring the waste mud in the waste mud storage tank 20 to the mixing tank 21 and the waste mud charged in the mixing tank 21 are transferred between tank parts. However, after separating the upper layer of mud and the lower layer of mud, the upper layer of mud is transferred to the mud storage tank 22, and the total amount of mud remaining in the mixing tank 21 is measured and added accordingly. An additive addition process for automatically supplying the input amount of the material to the mixing tank 21 by the additive supply apparatus 24 and a mixing process for mixing the mud and the additive to the target agitation degree in the mixing tank 21 via the backhoe 5 are performed. .

  Of these, in the waste mud charging step, the backhoe 5 is used and the waste mud in the waste mud storage tank 20 is repeatedly transferred to a predetermined tank part (for example, the tank part 21b) of the mixing tank 21 by the backhoe bucket 5d. Add only the approximate total amount of mud.

  In the muddy water removal step, first, the backhoe 5 is used to transfer the discharged mud put into a predetermined tank section (for example, the tank section 21b) to the tank section 21a by the bucket 5d, or from the tank section 21a to the tank section 21b again. , The tank part 21a for storing a lot of mud with a large specific gravity, and the tank parts 21b and 21c for collecting a mud with a low specific gravity and separating it into an upper layer mud and a lower layer mud are obtained. Thereafter, the upper layer of muddy water in the tank portion 21c that has overflowed the lowest partition wall 23b using the backhoe 5 is transferred to the muddy water storage tank 22 by the bucket 5d.

  In the additive charging step, the total amount of mud remaining in the mixing tank 21 is measured by the procedure of FIG. 9, and the additive amount corresponding to the total amount of mud is input to the tank portion 21 a of the mixing tank 21 by the additive supply device 24. Supply in. In this case, the total amount of mud is first measured. This measuring method is calculated, for example, by reading with a capacity scale attached to the inner surface of each tank part 21a, 21c and adding them. In this case, when the mud of the tank parts 21b and 21c is small, the mud of the tank part 21b and the tank part 21c is moved to the tank part 21a and read on the capacity scale on the tank part 21a side in order to suppress measurement errors. Next, the total amount of additive added (addition amount) is, for example, in the case where the additive is cement, the amount of cement added by a preliminary blending test using mud that simulates the mud previously separated from the waste mud. The relationship with the solidification strength is displayed in a graph, and the cement blending amount per unit according to the target strength and application conditions is obtained with reference to the graph, and then converted into the total amount of mud. The same applies when the additive is cement and auxiliary materials.

  In the additive supply device 24, as shown in FIG. 9, the control unit 35 (see FIG. 6) sets the input amount based on the data received through the receiver (steps ST1 and ST2). Then, the vertical screw transfer means 29 is activated and the horizontal screw transfer means 28 is activated (steps ST3 and ST4), and then the butterfly valves 32 and 33 are opened (steps ST5 and ST6). As a result, the cement and the auxiliary material are mixed and fed by the horizontal screw transfer means 28 and the vertical screw transfer means 29 and discharged from the discharge chute 30 into the tank portion 21a of the mixing tank 21.

  When the discharge amount reaches the set value, that is, when the result of subtracting the current load measurement value from the load measurement value of the load cell 31 before reaching the signal coincides (Yes in step ST7), the butterfly valves 32 and 33 are closed (step) ST8) Then, after a predetermined time delay (step ST9), the screw transfer means 28 and 29 are stopped (steps 10 and 11) and again enter a signal waiting state.

  Thereafter, a mixing step is performed, and by operation of the backhoe 5, the solidified material introduced into the tank portion 21a, or the solidified material, the auxiliary material agent, and the mud are sequentially taken into the intermediate tank portion 21b, and the partition portions 23a, The operation of kneading while dropping on 23b is repeated. In this kneading operation, the reclaimed soil is produced by mixing until the target degree of stirring is reached. The produced reclaimed soil is transferred to the storage area 3 by operating the backhoe 5. Thereby, the reproduction | regeneration operation | work of the reproduction | regeneration processing soil for 1 batch is completed. Prior to this operation, the discharge chute 30 is preferably tilted to an angle that does not interfere with the bucket 5d via the cylinder 36 (see FIG. 6) as indicated by the imaginary line in FIG.

  As described above, the present invention only has to substantially include the configuration specified in the claims, and the details can be variously changed with reference to the above-described embodiments.

1 ... Ground improvement zone (10 is the construction machine, 14 is the stirring shaft, 15 is the kettle)
2 ... Reproduction work area 3 ... Preservation area 4 ... Collection vehicle 5 ... Backhoe (5c is a bucket)
16 ... Classification tank 20 ... Waste mud storage tank 21 ... Mixing tank (21a-21c is a tank part, 23a and 23b are partition parts)
22 ... Muddy water storage tank 24 ... Additive supply device 26 ... Rectangular tank (cement storage tank)
27 ... Cylindrical tank (auxiliary material storage tank)
28 ... Horizontal screw transfer means 29 ... Vertical screw transfer means 31 ... Load cell 32, 33 ... Butterfly valve (open / close valve)

Claims (4)

It has a mixing tank that divides the inside of the tank into a plurality of tank parts via a partition part, and the waste mud generated by ground improvement etc. is thrown into a predetermined tank part among the plurality of tank parts of the mixing tank, Adjusting the moisture by removing the upper layer mud from the tank and separating it into the upper layer mud and the lower layer mud in the tank with the operation of transferring the waste mud from the specified tank to another tank by a backhoe. In addition, in the waste mud regeneration treatment equipment that mixes additives and produces fluidity improved soil,
The backhoe disposed near one end in the longitudinal direction of the mixing tank, and an additive supply device that is provided near the other end in the longitudinal direction of the mixing tank and automatically feeds the additive into the mixing tank;
A waste mud storage tank for storing the generated waste mud provided near one side along the longitudinal direction of the mixing tank, and an upper layer provided near the other side along the longitudinal direction of the mixing tank and separated by settling And a muddy water storage tank for collecting muddy water.
The backhoe can transfer the waste mud of the waste mud storage tank to the mixing tank, and can transfer the upper layer muddy water settled and separated in the mixing tank to the mud water storage tank,
The additive supply apparatus has a solidification material tank containing a solidification material such as cement as the additive, and an auxiliary material tank containing an auxiliary material such as a strength promoting material, and the total amount of mud remaining in the mixing tank. Accordingly, the sludge discharged from the solidification material tank or / and the auxiliary material tank can be charged with the necessary amount of the solidification material or the necessary amounts of the solidification material and the auxiliary material into the mixing tank. Reproduction processing device.   The additive material supply device includes a load measuring means for each tank that independently measures the solidified material tank and the auxiliary material tank, one end side connected to the lower discharge portion of each tank via an on-off valve, The waste mud regeneration processing apparatus according to claim 1, further comprising a screw transfer means having an end side opened in the mixing tank.   The plurality of tank parts are provided so that the height of the partition part or / and the height of the tank bottom surface is different, so that the waste mud settles and separates the upper muddy water from one tank part to the other. The waste mud regeneration processing apparatus according to claim 1, wherein the waste mud regeneration processing apparatus is easily discharged to the tank section. In the waste mud regeneration processing method of collecting waste mud generated by ground improvement, etc., adjusting the moisture of the waste mud, mixing the additive and producing fluidity improved soil,
Using the waste mud regeneration processing apparatus according to any one of claims 1 to 3,
A waste mud charging step of transferring the waste mud in the waste mud storage tank to the predetermined tank portion of the mixing tank by the backhoe;
Along with the operation of transferring the waste mud of the predetermined tank part to the other tank part by the backhoe, the tank part for storing a large amount of mud soil with a large specific gravity, the mud water with a low specific gravity and the upper layer mud water and the lower layer sedimentation component. A muddy water removing step of transferring the upper layer muddy water to the muddy water storage tank by the backhoe after dividing into a tank portion separated into muddy soil,
Measuring the total amount of mud remaining in the mixing tank, and adding the additive amount corresponding to the total amount of the mud into the mixing tank from the additive supply device,
A waste mud regeneration treatment method comprising: passing through the mixing step of mixing the mud and the additive to a target degree of stirring by the backhoe in the mixing tank.

Images