JP2020163319A - Manufacturing method to convert inorganic sludge into recycled soil - Google Patents

Abstract

To provide a method for inexpensively producing recycled soil of a required particle size, without the need for the conventional work of depositing and raising solidified sludge on a flat ground and loosening it with a backhoe, etc., and further without using a particle size separator/crusher for the recycled soil.SOLUTION: Sludge, cement-based solidifying material, and water are put into a granulating and solidifying processing machine 1 of a work vehicle C in a required weight ratio, an uncured and fluid solidified product of the granulating and solidifying processing machine 1 is carried by the work vehicle C to a sloping ground 2, the solidified material is dropped from above an upper end of the sloping ground 2 by a sloping discharge conveyor 13, and the solidified product KM is slid down and agitated on a surface of the slope 2, so that recycled soil with a small particle size is classified above the slope and recycled soil with a large particle size is classified and deposited on a lower side of the slope, and recycled soil is prepared in layers on the surface of the slope depending on a size of the particle.SELECTED DRAWING: Figure 4

Description

In the present invention, inorganic sludge (hereinafter, also simply referred to as sludge or construction sludge) having a small amount of organic matter generated in civil engineering construction work is kneaded with a solidifying material and required water with a granulation solidification processing machine to solidify the sludge. It relates to a manufacturing method which develops a predetermined hardening strength so that it can be reused as recycled soil.

Conventionally, inorganic sludge generated in civil engineering construction work is put into a granulation and solidification processing machine, mixed with a powdery cement-based solidifying material and required water at a required weight ratio, and then kneaded. The fluid kneaded solidified product is piled up (stacked) on the flat ground of the solidification treatment adjustment yard to a height of about 3 to 5 m, cured by the curing reaction of the solidifying material, and further loosened with a back hoe etc. on the way. Therefore, the recycled soil is prepared by adjusting it to a predetermined solidification (curing strength) state (see FIG. 6).

Recycled soil produced by conventional granulation and solidification treatment and adjustment treatment contains multiple sludge components (fine grain, medium grain, coarse grain, gravel, gala, etc.) with different particle sizes. ) And the powdery solidifying material are uniformly kneaded, and the recycled soil is a recycled soil with a particle size composition of sludge, and the recycled soil has basically the same particle size composition as the sludge, so its intended use is It was limited by its particle size and was narrow.

Further, the uncured solidified product was heaped up on the flat ground of the solidification treatment adjustment yard and then cured for about 4 weeks, but during that time, more loosening work was required with a backhoe or the like, so it was a laborious work.

Further, Patent Document 1 discloses a method for recycling construction sludge, which is solidified with a cement-based solidifying material containing calcium oxide, silicon dioxide, sulfur trioxide, and aluminum oxide in the construction sludge, and is used after curing. It is crushed to the required size and used as recycled soil. According to this, since the material is solidified and then crushed to a predetermined size, a crushing process is required, which has a drawback that the recycling cost of the recycled soil is high.

Patent Documents 2 and 3 also have a step of mixing sludge and a solidifying material to solidify and then crushing the sludge, and have the same drawbacks as those of Patent Document 1. In addition, the invention of Patent Document 2 requires a neutralization step using a carbon dioxide-containing gas, which increases the production cost of recycled soil. Further, the regeneration processing method of Patent Document 3 is a large-scale processing facility. Recycled soil having a required particle size cannot be obtained without crushing any of Patent Documents 1, 2 and 3. In addition, it was not an inexpensive regeneration method because it required loosening work and crushing work during curing.

JP-A No. 10-495 Japanese Unexamined Patent Publication No. 2009-28639 JP-A-10-244297

As shown in Fig. 6, the solidifying material / water and sludge are kneaded with a conventional granulation and solidification processing machine, raised on a flat surface, and then loosened with a backhoe or the like on the way, which requires more loosening work. It takes time and effort, and the particle size composition of the recycled soil is determined by the particle size component of the sludge, and only the recycled soil having a constant particle size composition can be produced. Therefore, the use of the recycled soil for various purposes is limited. Further, in the case of sludge having a high water content, the solidified product tends to form a large lump, which is crushed by a crusher and used as recycled soil.

The problem to be solved by the present invention is that the conventional production of recycled soil requires heaping work and more loosening work on flat ground, but this is not required, efficient adjustment work can be performed, and the grain size composition of sludge is different. Recycled soil classified in this way can be automatically manufactured, the usage of recycled soil can be expanded, and the manufacturing cost of recycled soil is extremely low because there is no crushing process and no loosening work is required. The purpose is to provide a method for producing recycled soil that can be produced.

The configuration of the present invention that solves this problem is
1) With respect to the inorganic sludge generated from the civil engineering construction site, the solidifying material and water are put into the granulation solidification processing machine at a predetermined weight ratio, and the sludge and the solidifying material are charged by the granulation solidification processing machine. And the water are kneaded to prepare a solidified product, and the solidified product in a uncured and fluid state is continuously or intermittently dropped from a position above the upper end of a sloped ground at a predetermined angle. The solidified product is loosened while rolling along the slope surface of the sloping ground by dropping from above the upper end, and the solidified product dropped by exerting specific gravity separation while stirring the solidified product. The components with a small particle size are deposited on the upper part of the slope, and the components with a large particle size are deposited on the slope of the slope so as to be classified up and down according to the particle size of the solidified product. By repeatedly dropping the solidified material from above the upper end of the sloping land, the slope position of the sloping land and the position of the upper end of the sloping land move in the direction released from the initial position of the sloping land due to the deposition of the solidified material. The reclaimed soil was deposited in layers in a state where it was classified into upper and lower grades according to the grain size, and the reclaimed soil with the required grain size could be shipped as it was by excavating the deposited reclaimed soil from the required height of the slope. Characteristic manufacturing method for converting inorganic sludge into recycled soil 2) The granulated and solidified product produced by mounting the granulated and solidifying treatment machine on a self-propelled vehicle and kneading with the granulating and solidifying processing machine. Prepare a work vehicle equipped with an inclined discharge conveyor that can be lifted high above the outside and discharge the vehicle, and put inorganic sludge, a solidifying material of a predetermined weight ratio, and water into the granulation and solidification processing machine of the work vehicle. While kneading and kneading to produce a solidified product, the work vehicle is moved to a loading position on a site with a slope and stopped, and the uncured product produced by the granulation and solidification processing machine by the slope discharge conveyor in the work vehicle. The inorganic material according to 1) above, wherein the solidified material of the above is lifted and dropped and discharged from the conveyor return portion at the upper end of the inclined discharge conveyor toward the upper end of the inclined ground so that the recycled soil is deposited in layers on the slope of the inclined ground. Manufacturing method to turn sex sludge into reclaimed soil 3) The slope and upper end of the sloping land are deposited by dropping the solidified material once or multiple times from above the upper end of the sloping land within a working range of a predetermined width along the cliff of the sloping land. Then, when moving forward in the open direction of the sloping land, the area of the predetermined width adjacent to the cliff of the work range of the predetermined width processed along the cliff of the sloping land is dropped along the cliff and the next work range of the processing work. And said Similarly, after performing the dropping work of the solidified product once or a plurality of times, the dropping work of the solidified product is repeated in the same manner with a new area of a predetermined width adjacent to the left and right as the next work range along the cliff of the sloped land. By forming a wide layered sedimentary layer along the cliff on the slope of the sloping land and excavating the reclaimed soil of the sedimentary layer of a predetermined particle size along the cliff, drop treatment work and excavation discharge treatment work can be performed. The method for producing recycled soil from the inorganic sludge according to the above 1) or 2), which is characterized by being able to be performed efficiently. 4) The upper end and the lower end of the slope before the solidified product on the slope starts to fall. The method for producing recycled soil from the inorganic sludge according to any one of 1) to 3) above, wherein the initial height difference is 12 m or more and the initial inclination angle of the inclined above-ground portion is in the range of 50 ° to 75 °.

According to the present invention, a solidifying material and water are put into a granulation and solidifying processing machine at a required weight ratio for inorganic sludge generated from a civil engineering construction work site, and the sludge, the solidifying material and water are kneaded and solidified. The material is dropped from above the upper end of the sloping ground in a state of uncured fluidity, and the solidified material is agitated while rolling along the surface of the sloping surface and slid downward. As a result, the large-grained components of the solidified product move downward while rolling strongly over the viscosity, and the small-grained components do not roll much and adhere to and deposit on the upper part of the slope of the slope. Further, since the one having a large particle size has a large weight and the particle size is large and is easy to roll, the one having a large particle size falls to the lower side and is deposited in the lower part. In this way, the deposition positions are classified vertically according to the particle size. By repeatedly dropping and throwing the solidified product from above the sloped ground edge in the front-rear direction, the left-right direction, or the combination direction thereof, the recycled soil of the solidified product continues to be deposited in layers according to the particle size on the slope of the slope.

As a result, the solidified material that has fallen and accumulated on the inclined surface is deposited in layers that are classified vertically so that the components with small particle size are on the upper side and the components with large particle size are on the lower side, and the hardening progresses to form a layered recycled soil. Become.

Therefore, when reclaimed soil with a large grain size is required, the reclaimed soil may be mined from the layer deposited at the bottom of the sloping land, transported to the site of the required landfill site using a truck, dump truck, etc., and buried at the site. .. Similarly, when recycled soil with a small grain size is required, it may be mined and transported from above the slope with a backhoe, shovel work vehicle, bucket work vehicle, or the like. In this way, when it is desired to use the reclaimed soil having a large required particle size, a layer of reclaimed soil having a required height may be mined and transported.
For example, if reclaimed soil with a small grain size is required, it may be mined from a part close to the exposed part on the slope of the layer with a high slope, and if the grain size is large, it is desirable to mine the soil below the layer. Recycled soil with the same grain size can be obtained.

As described above, according to the present invention, the reclaimed soil deposited on the slope of the sloping ground can be classified up and down according to the particle size, so that the solidified product is layered by the particle size in the curing reaction (usually about 4 weeks). After that, the reclaimed soil of a predetermined particle size can be easily mined and used by excavating a layer having a high particle size. Moreover, since the reclaimed soil deposited on this inclined surface is formed in layers according to the particle size, recovery of the reclaimed soil having a specific particle size does not require a special mechanical device for separation by any particle size, and further, the solidified product. No special loosening work or crushing work is required, and it can be manufactured at extremely low cost.

FIG. 1 is a side view of a self-propelled granulation and solidification processing machine used in an embodiment of the present invention. FIG. 2 is a plan view of the granulation and solidification processing machine of the embodiment. FIG. 3 is a rear view of the granulation and solidification processing machine of the embodiment. FIG. 4 is an explanatory diagram showing the state of falling and sliding down and the classification and layer formation according to the particle size on the slope of the solidified product in the example. FIG. 5 is an explanatory view showing a work procedure in which the work range of the drop treatment of the solidified material is changed in the left-right direction along the cliff to form a long layered sedimentary slope of recycled soil along the cliff. FIG. 6 is an explanatory diagram showing a raised state of a conventional solidified product in a solidification treatment adjustment yard.

The height (vertical difference) of the sloping ground of the present invention is practically 12 m or more because sufficient classification cannot be performed if the height difference is small, preferably about 15 to 30 m at the initial stage of the sloping ground portion (before dropping). It is practical that the inclination angle of the inclined surface is 50 ° or more, and if it is 50 ° or less, the sliding phenomenon of the solidified product while rolling is unlikely to occur, the upper and lower classification due to the particle size is weakened, and the hump-like / shelf is formed in the middle of the inclined surface. It tends to stay in a state, and classification and layer formation are incomplete. Further, if the inclination is 80 ° or more, the sliding down while rolling on the inclined surface causes a sudden drop, the classification by the particle size due to the rolling is also weakened, and the layer formation of the particle size becomes insufficient. A practical initial tilt angle of 50 ° to 75 ° is preferable as the initial tilt angle. In addition, the angle of the slope of the sloped land tends to be smaller than the initial slope due to the slope accumulation as the solidified material is dropped.
In addition, the height at which the solidified product is dropped is about 20 to 40 m, which ensures the rolling of the solidified product and the slope length of the classification, and it is easy to mine the reclaimed soil of a predetermined particle size after layer formation, and the sloped land. It is practical without the risk of collapse.

Further, as the solidifying material, a cement-based solidifying material such as calcium oxide, silicon dioxide, or aluminum oxide can be used. The weight ratio of the mixture with the sludge is an appropriate weight ratio according to the sludge.

The granulation and solidification processing machine and the inclined discharge conveyor are installed in a work vehicle that can run by itself with a crawler or the like, and sludge, a solidifying material, and water are put into the granulation and solidification processing machine of the work vehicle and kneaded to prepare a solidification processed product. While moving to the drop-in position of the drop-in place on the sloping ground, the uncured discharge conveyor installed in the vehicle solidifies the solidified product with the granulation solidification processing machine, and the solidified product is placed above the upper end of the sloping ground in a uncured and fluid state. There is a way to drop it from.
Alternatively, the granulation and solidification processing machine is fixedly placed near the loading site, and the solidification processed product produced by the same granulation and solidification processing machine is transported to the site by another solidification processing product transport vehicle, and the slope of the sloped land is inclined. It may be dropped onto a sloping ground with a dedicated loading device having a conveyor. Alternatively, another long transport conveyor may be used to transport the conveyor to the loading site on the sloping ground, and the conveyor may transfer the solidified material to the loading site on the sloping ground to perform the drop-loading operation. Alternatively, a transport vehicle equipped with a conveyor having an inclined discharge conveyor dedicated to drop-in and a temporary storage tank for the solidified product is prepared to receive the uncured fluid solidified product discharged from the granulation solidification processing machine. It is also possible to carry the machine, stop at the loading position on the sloping ground, and then use the conveyor to drop and discharge from above the upper end of the sloping ground. Of course, as described above, the granulation and solidification processing machine and the inclined discharge conveyor may be installed in the traveling vehicle to perform the granulation and solidification processing and drop-in on the inclined ground.

Hereinafter, examples of the present invention will be described with reference to the drawings.
The granulation and solidification processing machine 1 of this embodiment is installed in a work vehicle C capable of self-propelling with a crawler C1, and the sludge and solidification material of the granulation and solidification processing machine 1 in which sludge, a solidifying material, and water are kneaded into the vehicle frame C2. A water inlet 10 is provided at the rear of the vehicle, and a fluid solidified product kneaded by the granulation / solidification processing machine 1 described above is sent to the front of the vehicle and lifted forward from the vehicle ground plane 3 to 3 to An inclined discharge conveyor 13 is provided which drops and discharges from the return portion 131 at the tip at a height of about 6 m to the upper end 21 of the inclined ground 2.
The height of the input site of the slope 2 is about 17 m, and the initial inclination angle of the slope 2 is about 70 °, so that the work vehicle C can safely enter the input site 4 of the slope 2. Leveling or concrete road surface is laid so that access can be made.
Furthermore, construction sludge from the outside is temporarily received in a sludge receiving pit (not shown) provided at a position away from the slope. This is an example in which a backhoe or the like is used to supply the sludge from the sludge receiving pit to the granulation / solidification processing machine 1 when necessary. Recycled inorganic sludge is an inorganic sludge generated from a construction site and has a small amount of organic components, and is called construction sludge.

(Explanation of sign)
Reference numerals of the drawings of the examples will be described.
C has a known processing capacity of 135 m ² / h and a maximum processing capacity of 1,080 m ³ / day. A work vehicle capable of self-propelling with a crawler C1 by installing a granulation and solidification processing machine 1 and an inclined discharge conveyor 13 on a vehicle frame C2. Is. C1 is the crawler, C2 is the vehicle frame, and C3 is the driver's seat. 1 is a granulation and solidification processing machine of the embodiment, 10 is an inlet for sludge, a solidifying material, water, etc. provided behind the granulation and solidification processing machine 1, and 13 is a solidification treatment produced by the granulation and solidification processing machine 1. The sludge discharge conveyor provided in front of the vehicle frame C2 that lifts the object KM by about 3 to 6 m and drops and discharges (loads) it from the return portion 131 at the tip, 2 is a sloped ground, and the height of the loading field is about 17 m, which is the initial stage. The inclination angle θ is about 70 °. Reference numeral 20 is the slope of the slope 2 and 21 is the upper end of the slope 2. When deposited, the height becomes about 19 m. 22a, 22b, 22c, 22d are classification layers formed on the slope 2 and classified to the size of the particle size, 22a is a fine-grained recycled soil layer containing a large amount of fine particles, and 22b contains a large amount of medium powder. The medium grain regenerated soil layer, 22c is a coarse grain regenerated soil layer containing a large amount of coarse particles, and 22d is a gravel regenerated soil layer containing a large amount of gravel, gala, unimproved lumps, and the like. Reference numeral 23 denotes a large block wall for preventing scattering provided below the slope 2. 4 is a loading place, 5 is a conventional solidification treatment adjustment storage place, and 50 is an embankment of a conventional solidification treatment product KM. KM is the solidified product raised in the solidification treatment adjustment yard, G is gala, and R is gravel.

(Sludge delivery and acceptance)
Inorganic sludge generated from a construction site (hereinafter, simply referred to as sludge or construction sludge) is first loaded on a dump truck or truck and stored in a sludge pit (not shown) provided near the slope 2. In addition, a silo (not shown) that can store the solidifying material and discharge the required amount is provided near the sludge pit.
Next, at the time of producing the recycled soil from the construction sludge stored in the sludge pit, the sludge in the sludge pit is loaded on a vehicle such as a backhoe and carried to the work vehicle C for producing the recycled soil, and the work vehicle C A predetermined amount is charged from the charging port 10 of the same granulation and solidification processing machine 1.

After a predetermined amount of construction sludge is charged into the inlet 10 of the granulation solidification processing machine 1, a cement-based solidifying material and a required amount of water are also charged from the silo at a predetermined weight ratio to the predetermined amount of construction sludge to granulate. When the solidification processing machine 1 is operated to knead the sludge, the solidifying material, and water to proceed to the required hardening and have the required fluidity (viscosity), the work vehicle C equipped with the granulation solidification processing machine 1 Is moved to the loading position of the loading field 4 where the inclined ground 2 is located, the inclined discharge conveyor 13 of the work vehicle C is set to a position extending in the inclined ground 2 direction, and the return portion 131 of the inclined discharge conveyor 13 is located at the upper end 21 of the inclined ground 2. Adjust the position on the work vehicle C until it is located above.

After that, when the kneading by the granulation solidification processing machine 1 is sufficiently performed and the solidification processed product becomes appropriately hardened or fluid, the inclined discharge conveyor 13 is operated to move the solidification processed product KM of the granulation solidification processing machine 1. The inclined discharge conveyor 13 lifts the return portion 131 upward and forward to the upper end 21 of the inclined ground 2 and drops and discharges (fills in) the return portion 131.

The solidified product KM that falls from the return portion 131 falls on the surface of the slope 20 by adding the acceleration of its own weight fall to the falling speed along the slope 20 near the upper end 21 of the slope 2, and falls from the slope 20 along the slope 20. It slides down while receiving resistance. Since the grain size and diameter of the solidified product KM are small, it rarely rolls along the slope 20 and slides down due to the resistance from the slope 20 and the viscosity of the solidified product KM (along the slope 20). The fall) is small. On the other hand, the one having a large particle size has a large inertial force due to its own weight and the diameter is also large, so that the falling inertial force and the rolling torque are large, and the one having a large particle size slides downward while rolling downward.
Therefore, those having a small grain size adhere to the upper part of the slope 2 and are deposited, and those having a large grain size slide down to the bottom and are deposited downward. Further, many slopes are deposited downward, and the slope angle at the bottom of the slope becomes small and gentle.

This state is shown in FIG. In the uppermost classification layer 22a of the slope of the slope 2, a solidified product KM containing a large amount of fine particles having a particle size is deposited on about 19% of the upper part of the slope. Next, a solidified product containing a large amount of medium particles having a particle size is deposited on the upper classification layer 22b with a layer thickness of about 35% along the slope, and coarse grains are further formed on the third classification layer 22c. A solidified product containing a large amount of particles is deposited with a layer thickness of about 31%. Then, the solidified product KM such as gravel R / gala G and unimproved lumps is deposited as the lowermost classification layer 22d with a layer thickness of about 15% (see FIGS. 4 (a) and 4 (b)). The thickness of the classification layer according to this particle size varies depending on the sludge grain composition, but the classification is close to the above state.

Therefore, as shown in FIG. 4B, the reclaimed soil of the present invention is deposited along the slope so as to be roughly classified according to the size of the particle size. After about 4 weeks of accumulation, hardening is completed and it can be used as recycled soil.

In addition, each layer classified into upper and lower particles should be excavated for each layer and stored as recycled soil, discharged from the stored material at the time of shipping request, loaded on a dump truck, truck, etc. and transported to the destination. You can also. When necessary, it may be excavated and transported directly from a layer of sloped land having a predetermined particle size.

The state of hardening of the solidified product KM deposited in layers on this slope changes the degree of hardening of the solidified product deposited before and after each layer. The area in front of each layer is not hardened, and the deposits behind each layer are hardened. Hardening is completed in about 4 weeks after the fall, and the soil becomes recycled soil. Further, when shipping in the state of curing, those having the required hardness can be selectively shipped by selecting before and after the layer.

In the present invention, when the recycled soil having a large amount of fine particles is shipped, the classification layer 22a having a thickness of 19% above the slope 2 may be mined with a tractor excavator / high-altitude mining machine and shipped. Further, when it is desired to ship the recycled soil having a large amount of medium-grained components, the recycled soil of the second layer 22b, which is 19 to 54% from the upper part of the slope, is excavated and shipped. Further, in the case of recycled soil having a large coarse particle content, the recycled soil of the third layer 22c of the third layer, which is 54 to 85% from the top, may be excavated and shipped. Next, the reclaimed soil of the fourth layer, which contains a large amount of gravel, gala, and unimproved lumps, may be shipped by excavating 85 to 100% of the reclaimed soil of the lowest layer from above.
In this way, the recycled soil according to the particle size can be excavated from the specific classification layers 22a to 22d above and below the slope 2 and shipped, so that the recycled soil according to the particle size can be used and can be reused appropriately. To do.

The drop position of the solidified product KM on the sloping land is repeatedly moved multiple times so as to advance in front of the sloping land within a predetermined width (working range) along the cliff of the sloping land, and the solidified product KM is dropped once or. After accumulating multiple times and moving the sloping surface mainly in the forward direction with the sloping surface open at the predetermined width of the sloping land so as to advance in layers with the predetermined width, the work range is changed to another sloping land.

As an alternative method, after repeating the fall of the solidified product KM from the sloping land one or more times forward, the working range of the falling position of the sloping land was moved to the lateral position along the cliff of the sloping land and moved. After dropping the solidified product KM once or multiple times at the place, move to the side position along the left and right of the cliff instead of the front and repeat the drop-in operation to move laterally along the cliff on the slope. The solidified material is dropped in a wide new area, and the work of falling forward is small with a wide width along the cliff of the slope, and the work is done by moving to the left and right of the cliff. There is a way to form reclaimed soil. This method has less collapse of the inclined surface and facilitates excavation of recycled soil (see FIG. 6). For excavation, the excavator is moved along the cliff of the sloping land at a predetermined time to collect the reclaimed soil of the particle size of the layer of the predetermined height, and it is transported by truck / dump truck as the reclaimed soil and put into the site of use. ..

In the case of the manufacturing method of FIG. 6, the work vehicle C is shifted sideways along the cliff on the sloping ground, or the inclined discharge conveyor is swung along the cliff by changing the arrangement posture of the work vehicle C. The solidified material is moved laterally along the cliff of the sloping land to form a horizontally long layered sedimentary layer along the cliff of the sloping land. It is preferable to form a horizontally long layered sedimentary layer along the latter cliff because safe work can be performed and reclaimed soil can be excavated along the cliff.

The embodiment of the present invention is an example of using construction sludge as recycled soil, but it is also applied to reuse of recycled soil prepared with a solidifying material of sludge and waste that is also generated in excavated soil of ground excavation or tunnel construction. it can.

C Work vehicle C1 Crawler C2 Vehicle frame C3 Driver's seat 1 Granulation solidification processing machine 10 Input port 13 Inclined discharge conveyor 131 Return part (discharge part)
2 Slope 20 Slope 21 Upper end 22a, 22b, 22c, 22d Classification layer 23 Large block wall for anti-scattering 4 Input site 5 Solidification treatment adjustment yard 50 Embankment of solidification treatment product KM Solidification treatment product G Gala R gravel

The configuration of the present invention that solves this problem is
1) With respect to the inorganic sludge generated from the civil engineering construction site, the solidifying material and water are put into the granulation solidification processing machine at a predetermined weight ratio, and the sludge and the solidifying material are charged by the granulation solidification processing machine. And the water are kneaded to prepare a solidified product, and the solidified product in a uncured and fluid state is continuously or intermittently dropped from a position above the upper end of a sloped ground at a predetermined angle. The solidified product is loosened while rolling along the slope surface of the sloping ground by dropping from above the upper end, and the solidified product dropped by exerting specific gravity separation while stirring the solidified product. The components with a small particle size are deposited on the upper part of the slope, and the components with a large particle size are deposited on the slope of the slope so as to be classified up and down according to the particle size of the solidified product. By repeatedly dropping the solidified material from above the upper end of the sloping land, the slope position of the sloping land and the position of the upper end of the sloping land move in the direction released from the initial position of the sloping land due to the deposition of the solidified material. The reclaimed soil is deposited in layers in a state of being classified into upper and lower parts according to the grain size, and the initial height difference between the upper end and the lower end of the slope before the solidified product on the slope starts to fall is 12 m or more and the above-ground part of the slope. The initial inclination angle of the slope is in the range of 50 ° to 75 °, and the accumulated reclaimed soil is excavated from the required height of the slope so that the reclaimed soil of the required grain size can be shipped as it is. 2) The granulation and solidification treatment machine is installed in a self-propelled vehicle, and the granulation and solidification treatment product produced by kneading with the granulation and solidification treatment machine is placed on the outside. Prepare a work vehicle equipped with an inclined discharge conveyor that can be lifted high upward and drop and discharge the vehicle, and put inorganic sludge, a solidifying material of a predetermined weight ratio, and water into the granulation and solidification processing machine of the work vehicle and knead them. Then, while producing the solidified product, the work vehicle is moved to a loading position at a site with a slope and stopped, and the uncured solidification produced by the granulation solidification processing machine by the slope discharge conveyor in the work vehicle. The inorganic sludge according to 1) above, wherein the processed material is lifted and dropped and discharged from the conveyor return portion at the upper end of the inclined discharge conveyor toward the upper end of the inclined ground so that the recycled soil is deposited in layers on the slope of the inclined ground. 3) Along the cliff of the sloping land, the solidified material is dropped one or more times from above the upper end of the sloping land within a work range of a predetermined width, and the slope and the upper end of the sloping land are deposited. Inclined When moving forward in the open direction of the ground, the area of the predetermined width adjacent to the cliff of the work range of the predetermined width processed along the cliff of the slope is set as the next work range of the drop processing work. After performing the dropping work of the solidified product once or a plurality of times in the same manner as described above, the dropping work of the solidified product is similarly performed along the cliff of the sloping land with a new area of a predetermined width adjacent to the left and right as the next work range. By repeating this process, a wide layered sedimentary layer is formed along the cliff on the slope of the sloping land, and the reclaimed soil of the sedimentary layer of a predetermined particle size is also excavated along the cliff. The method for producing recycled soil from the inorganic sludge according to 1) or 2) above, which is characterized by being able to efficiently perform the above.

Claims (4)

A solidifying material and water are put into a granulation solidification processing machine in a predetermined weight ratio with respect to the inorganic sludge generated from the civil engineering construction site, and the sludge, the solidifying material and the solidifying material are charged by the granulation solidification processing machine. A solidified product is prepared by kneading with water, and the solidified product in a uncured and fluid state is continuously or intermittently dropped from a position above the upper end of a sloped ground at a predetermined angle. By dropping from above the upper end, the solidified product is loosened while rolling along the slope surface of the sloped ground, and by activating specific gravity separation, the solidified product that has been dropped is stirred while the particle size of the solidified product is adjusted. Solidification proceeds in a state where small components are deposited on the upper part of the slope and large particles are deposited on the slope of the slope so that they are classified vertically according to the particle size of the solidified product. By repeatedly dropping the solidified material from above the upper end of the slope, the slope position of the slope and the position of the upper end move in the direction released from the initial position of the slope due to the deposition of the solidified material, and the grain size on the slope. The feature is that the reclaimed soil is deposited in layers in the state of being classified up and down, and the reclaimed soil of the required grain size can be shipped as it is by excavating the deposited reclaimed soil from the required height of the slope. A manufacturing method that turns inorganic sludge into recycled soil. The granulation and solidification processing machine is installed in a self-propelled vehicle, and an inclined discharge conveyor capable of dropping and discharging the granulation and solidification processed product produced by kneading with the granulation and solidification processing machine is provided to the vehicle. Prepare the provided work vehicle, put inorganic sludge, a solidifying material of a predetermined weight ratio, and water into the granulation and solidification processing machine of the work vehicle and knead them to prepare a solidified product, and make the work vehicle on a slope. The vehicle is moved to the loading position at the site where the vehicle is loaded, stopped, and the uncured solidified product produced by the granulation solidification processing machine is lifted by the inclined discharge conveyor in the work vehicle to lift the conveyor return at the upper end of the inclined discharge conveyor. The method for producing recycled soil from the inorganic sludge according to claim 1, wherein the recycled soil is deposited in layers on the slope of the slope by dropping and discharging from the portion toward the upper end of the slope. When the solidified material is dropped once or multiple times along the cliff of the sloping land from above the upper end of the sloping land within a work range of a predetermined width, the slope and the upper end of the sloping land are deposited and advance in the open direction of the sloping land. After that, the area of the predetermined width next to the cliff of the work range of the predetermined width processed along the cliff of the sloping land is set as the next work range of the drop processing work, and once or multiple times in the same manner as described above. After performing the fall work of the solidified material, the cliff on the slope of the sloping land is further repeated along the cliff of the sloping land with a new area of a predetermined width next to the left and right as the next work range. By forming a layered sedimentary layer with a wide width along the cliff and excavating the reclaimed soil of the sedimentary layer of a predetermined grain size along the cliff, it is possible to efficiently perform the drop treatment work and the excavation discharge treatment work. , A method for producing recycled soil from the inorganic sludge according to claim 1 or 2. Claimed that the initial height difference between the upper end and the lower end of the slope before the solidified product on the slope starts to fall is 12 m or more, and the initial inclination angle of the above-ground portion of the slope is in the range of 50 ° to 75 °. A production method for converting the inorganic sludge according to any one of 1 to 3 into recycled soil.

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