JP2000096605A - Backfilling method and backfilling material producing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide backfilling material by reusing excavated earth effectively and to enable backfilling work in a short time. SOLUTION: Excavated earth is sifted and classified to obtain raw mud having a predetermined volume or less. The raw earth is supplied by a predetermined amount and an appropriate amount of water is fed to the raw earth from a feed water tank 4. A first mixer 3 for agitating them is placed and the mud slurry agitated by the first mixer for a predetermined time is conveyed to the desired site. The mud and a solidifying agent in an amount corresponding to the amount of the mud are put in the second mixer 6 in the desired site to obtain a backfilling material. The backfilling material is poured into an excavation from the discharge opening of the second mixer. Therefore, the backfilling material can be directly manufactured at a construction site to reduce noise pollution produced near houses or during the night. Further, since the solidifying agent having a quick-solidifying property is usable, a road surface can be restored rapidly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a civil engineering work for digging underground to lay water pipes, conduits and the like, and to dig backfill materials used for burying water pipes and conduits. The present invention relates to a backfill method and a backfill material manufacturing apparatus that obtains a backfill material by using excavated soil obtained by excavating a ground.

[0002]

2. Description of the Related Art For pipes such as water pipes and electric conduits, excavation trenches having a predetermined depth are excavated in the ground, these are plumbed into the trenches, and sand and excavated soil are again injected into the trenches to refill the trenches. The current situation is that Most of such construction sites are on roads or sidewalks where there are many vehicles and traffic.
A trench of a predetermined depth is excavated in these roads or sidewalks, and necessary piping is provided in the trench, and then backfilling is performed.
In such a current situation, the work is often performed intensively at night when traffic of cars and people is small. For this reason, the work time is limited, and since it is required to complete a series of work from excavation to backfilling within this work time, the section in which the work is performed within the time is also limited. In addition, since the work must be completed within the working time and vehicles and people must be able to pass again, the actual working time is short, and the length of one work section is short. Drilling machinery required from drilling to backfilling,
There are restrictions such as the need to prepare mixers, equipment such as a machine for solidifying the ground after backfilling, and backfilling materials such as sand and earth and sand used for backfilling in advance.

[0003]

For this reason, when a water pipe or an electric conduit is piped into an excavation trench and is refilled,
When earth and sand such as excavated soil are injected into the trench, a gap is easily generated around the pipe. After squeezing this so as to be evenly distributed around the pipes, placing earth and sand such as excavated soil generated by excavation work on it, compacting it and performing backfill work, All of the earth and sand could not be backfilled in this trench, and the surplus soil that became unnecessary was discarded as industrial waste or used for landfill, which wasted a lot of resources. In addition, in the disposal of the remaining soil, it is difficult to secure this disposal site and it is a remote place.
The time and cost required to dispose of surplus soil are increasing.

[0004] In addition, since a large amount of sand is required for backfilling the excavation trench, the natural environment is destroyed due to the removal of the sand, such as the cutting of mountains and seasides. Furthermore, sand is injected around the pipes, and then the worker squeezes the sand so that the sand spreads around the pipes without any gaps, but this tamping work requires a long time and stabilizes the ground. And roads and pavements are likely to sink or sink. In addition, since many workers manually perform this work or use a vibrating machine, the workers are apt to be tired and the work efficiency is poor. In addition, equipment such as mixers and machines used for compacting the ground must be transported to the construction site, which requires a large number of transport vehicles at all times, as well as loading and unloading the machinery, which takes time and labor. In addition to this, there are problems such as large noise and vibration.

A first object of the present invention is to solve such problems and effectively reuse excavated soil without newly adding sand to obtain a backfill material and to perform backfill work in a short time. The second object of the present invention is to enable
A third object of the present invention is to obtain a backfilling operation that reuses excavated soil and minimizes the use of a machine at the backfilling site. It is an object of the present invention to provide an apparatus for manufacturing a backfill material, which makes it possible to select either to obtain a backfill material or to obtain a backfill material at a place other than the backfill site.

[0006]

SUMMARY OF THE INVENTION A first object of the present invention is to:
In advance, excavated earth and sand are sieved and sorted to obtain a raw material soil having a predetermined volume or less, a predetermined amount of the raw material soil is supplied, and an appropriate amount of water previously adjusted and set for the supplied raw material soil is supplied to a water supply tank. A first mixer 3 for supplying water from the mixer 4 and stirring them is disposed, and the muddy mud stirred by the first mixer 3 for a predetermined time is carried out to a desired place via a carrying-out means. The mud and the solidified material according to the amount of the mud are charged into the installed second mixer 6 and kneaded, and the backfill is poured from the outlet 45 of the second mixer 6 to perform backfill. This is achieved by providing a backfill method.

A second object of the present invention is to sift and sort excavated earth and sand in advance to obtain a raw material soil having a predetermined volume or less, to supply a predetermined amount of the raw material soil, and to supply the supplied raw material soil. A first mixer 3 for supplying an appropriate amount of water adjusted and set in advance from the water supply tank 4, charging a solidifying material according to the amounts of the raw material soil and the water, and stirring and kneading them is arranged. Provided is a backfill method in which a muddy backfill material stirred and kneaded by the first mixer 3 for a predetermined time is carried out to a desired place via a carry-out means, and the backfill material is poured into the desired place and backfilled. Is achieved by

Further, a third object of the present invention is to supply a raw material soil obtained by sieving and excavating excavated earth and sand to remove a predetermined amount or more of earth and sand; A first mixer 3 that is disposed at a location where the raw material soil is supplied from the supply means, and a mud receiving tank 20 that is provided below the first mixer 3 and stores muddy water that has been stirred in a muddy state.
Moreover, a water supply tank 4 provided so as to be able to supply water by a predetermined amount set in advance according to the raw material soil supplied to the first mixer 3, and a second water supply tank provided above the first mixer 3 A solidified material storage tank 50 in which the 1 supply port 10 is located and which is provided adjacent to the first mixer 3 and which supplies a predetermined amount of the solidified material to the first mixer 3 as necessary;
A transportation vehicle for carrying out mud or backfill material from the first mixer 3; and a muddy mud adjacent to the first mixer 3 and in which raw material soil and water are agitated in the first mixer 3. This is attained by providing a backfill material manufacturing apparatus that includes a mud storage tank 30 that stirs and stores as needed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. FIGS. 3 and 5 show an outline of one of the backfill material manufacturing and backfill systems of the present invention. First, the outline of this system will be described. In FIG. 5, a digging groove 1 having a predetermined length, a predetermined depth and a predetermined width is dug in a predetermined digging section, and excavated soil generated by this digging is transported to a separate sedimentation yard (not shown). Have been. This earth and sand is a mixture of large stones and soil. From the earth and sand, as shown in FIG. 3, a large sieve or sand having a predetermined volume or more is sorted and supplied by a pre-installed sieve conveyor (not shown). Etc. are removed, and the raw material soil selected as the raw material of the backfill material is obtained. The raw material soil thus obtained is deposited and stored at a predetermined position, and a power shovel 2 as a transporter for transporting the raw material soil is installed near the raw material soil. The transporter may be, for example, a belt conveyor in addition to the power shovel.

A first mixer 3 is arranged in a movable range of the transporter, and a predetermined amount of raw material soil is supplied to the first mixer 3 from the transporter. At this time, water according to the amount of the earth and sand is supplied from the separately provided water supply tank 4, and the first mixer 3 supplies the water for a predetermined time.
It becomes muddy by stirring. When the stirring operation of the stirred earth and water is completed, the mud is discharged from below the first mixer 3 to a mud receiving tank 20 located below the first mixer 3. When the mud accumulates in the mud receiving tank 20 in this way, the mud is subsequently sent to the mud storage tank 30 by the supply pump 21 and is stirred and stored to the extent that it does not solidify until demand. On the other hand, when this demand is immediately available, it is immediately supplied from the mud receiving tank 20 to the mixer vehicle 5 which is a transport vehicle as an unloading means, and is transported to a predetermined site. Then, mud is supplied from the mixer wheel 5 to the second mixer 6 installed in advance at this site, and then a powdered solidifying material that acts to solidify the mud over time according to the amount of the mud is supplied. After a predetermined amount is charged, the mud and the solidified material are further stirred and kneaded in the second mixer 6.

When the backfill material is obtained by kneading in this manner, the backfill material is poured into the excavation groove 1 from below the second mixer 6. Since the poured backfill material is muddy, it is filled without gaps around the already laid pipe (not shown).
After that, when the backfill material accumulates to a depth enough to fill the pipe, the pouring of the backfill material is stopped, and if the backfill material is left for a predetermined time in this state, it hardens. Further, the remaining excavated earth and sand is placed thereon and compacted, thereby enabling pavement.

On the other hand, the second mixer 6
The backfill material is obtained by directly charging the solidified material in the form of powder into the mud in which the raw material soil and water are stirred in the first mixer 3 without installing the backfill material. In the case of transporting and directly pouring into the excavation trench 1, as shown in FIGS.
This is possible by disposing a predetermined amount of the solidifying material as needed when stirring the raw material soil and water in the first mixer 3.

The following is a specific example of such a backfill system. In FIGS. 5 and 6, 2 is obtained by excavating underground and sieving the earth and sand discharged by forming the excavation groove 1 into soil having a predetermined volume or more and raw material soil having a predetermined volume or less on a conveyor. It is a power shovel as a transporter for scooping up the raw material soil by a predetermined amount. The amount picked up by the power shovel 2 is determined by the size of the bucket 7 at the tip of the excavator 2, whereby the amount of supply to the first mixer 3 is roughly measured. This first mixer 3 is shown in FIG.
And a first supply port 1 for supplying raw material soil as shown in FIG.
0 and a water supply pipe 60 for supplying water according to the supply amount of the raw material soil.
Is provided at the top. The first mixer 3 is mounted on a gantry 8, and the first mixer 3 having an elliptical shape fixed to the upper portion via the gantry 8 has two first rotating high-speed mixers as shown in FIGS. One rotating shaft 12 is mounted vertically and rotatably in parallel, and a turbine blade 13 for stirring the raw material soil and water supplied to the first mixer 3 is fixed below the first rotating shaft 12. Have been. In addition, the first rotating shaft 13 further diffuses mud-like solid-liquid particles of the raw material soil and water floating at the time of agitation by the turbine blade 13 on the upper portion, and the centrifugal force causes the inner wall surface of the first mixer 3 to move. A rotary wing 14 for circulating the solid-liquid particles is fixed on the inner wall surface of the first mixer 3 so that the solid-liquid particles circulating and floating along the inner wall surface by the centrifugal force are returned below the first mixer 3. As described above, the suppression blade 15 whose tip is curved downward and along the inner wall surface is attached.

A first motor 16 as a driving source is provided at the upper end of the first rotating shaft 12 via a transmission (not shown).
Are connected to each other, and the first rotating shaft 12 is rotated by the first motor 16. Further, the bottom surface 17 of the first mixer 3 is inclined toward the center of the elliptical first mixer 3, and a discharge port 18 is formed at the center of the inclined bottom surface 17. The discharge port 18 is closed during the stirring operation of the first mixer 3, and is opened so that the muddy mud is discharged downward when a predetermined stirring operation is completed. This first mixer 3
As shown in FIG. 2, the upper part is opened below the
7 are arranged on the both sides of the lower part of the mud receiving tank 20 with a slanted shape.
2 is rotatably supported. Two mud receiving tanks 20 are arranged on a rail 23, and each of these mud receiving tanks 2
Numeral 0 is configured to be movable to both sides of the first mixer 3 via wheels 22 on a rail 23 disposed parallel to the bottom of the gantry 8. With this configuration, even when the mud is being taken out from one mud receiving tank 20, if the other mud receiving tank 20 is moved and arranged below the first mixer 3, the supply of the mud is continued. Becomes possible. This makes the first
The mixer 3 can operate continuously.

The mud stored in the mud receiving tank 20 is supplied to a mud storage tank 30 shown in FIGS. 5 and 9 through a supply pipe 24 and a supply pump 21. The storage tank 30 has a rectangular shape, and a second rotating shaft 32 in which a stirring blade 31 for stirring is fixed in two stages is disposed inside. The second rotating shaft 32 is connected to a second motor 33 fixed on the upper side via a speed reducer (not shown), so that the mud is constantly stirred. Further, a first pipe 34 connected to the supply pipe 24 from the mud receiving tank 20 is provided on the front surface of the mud storage tank 30.
The first pipe 34 has its tip reaching the mud storage tank 30. In addition, this first pipe 3
A second pipe 35 for supplying mud to a mixer truck 5 as a transport vehicle is branched and connected to 4. This second pipe 3
Numeral 5 stands upright along the mud storage tank 30 and extends upward. The upper portion of the second pipe 35 is capable of turning horizontally so that mud is supplied from the tip of the second pipe 35. . On the other hand, the first pipe 34 is further branched in the middle to become a third pipe 36 which stands upright along the mud storage tank 30 and extends upward.
Numeral 6 is such that the tip reaches another mud storage tank 30 to supply mud thereto. These first,
The supply destination of the second and third pipes 34, 35, 36 is changed by switching the switching valve 37 according to the work. In this embodiment, two mud storage tanks 30 are arranged. However, one mud storage tank 30 or three or more mud storage tanks 30 may be provided as necessary.

Next, the structure of the second mixer 6 installed at the construction site will be described with reference to FIGS. 10 and 11. The second mixer 6 is provided with a second mixer 6 for supplying the mud conveyed by the mixer truck 5 to the upper portion. Supply port 40 and an input port (not shown) for inputting a powdery solidifying material for solidifying the mud to a predetermined hardness.
A third motor 41 as a drive source is fixed via a speed reducer (not shown) at a position close to the second supply port 40 as in the case of the first mixer 3.
A third rotating shaft 43 to which the stirring blade 42 is fixed is connected to each of the speed reducers. The bottom surface 44 of the second mixer 6
Is inclined to one side, and a discharge port 45 is formed at the lower end of the slope. The backfill material manufactured by kneading the mud and the solidifying material by the second mixer 6 for a predetermined time is the discharge port at the lower end of the slope. From 45, it is poured into the excavation groove 1.
A discharge valve 46 is attached to the tip of the discharge port 45, and a discharge pipe 47 for guiding the backfill material to a desired location is connected to the discharge valve 46.

Further, reference numeral 9 shown in FIG.
This is a control unit that adjusts and sets the rotation speed and the stirring time of the mixer. The control unit 9 controls the amount of water supplied to the first mixer 3 so that an appropriate amount of water is supplied in accordance with the supply amount of earth and sand. ing. The water whose water supply amount has been adjusted in advance with respect to the earth and sand supply amount in this manner is supplied separately to the water supply tank 4.
The first mixer 3 is configured to be supplied with water through a water supply pipe 60 connected to the first mixer 3.

In addition, reference numeral 50 shown in FIG. 6 indicates that the powdered solidified material is directly introduced into the mud in which the raw material soil and water are stirred in the first mixer 3 without installing the second mixer 6 at the construction site. By doing so, a backfill material is obtained, and the solidified material that enables the backfill material to be carried out by the mixer truck 5 and directly poured into the excavation trench 1 is stored, and a predetermined amount of the solidified material is provided on the upper portion of the first mixer 6. This is a solidified material storage tank to be charged from the charging port 11. The solidified material storage tank 30 is a first mixer 3
The operation is performed only when the backfill material is obtained, and when the backfill material is obtained at the construction site, the operation can be stopped by stopping the operation.

As shown in FIGS. 5 and 6, the excavated soil backfilling apparatus constructed as described above sieves excavated earth and sand mixed with stone and soil carried out of a construction site, and is conveyed by a conveyor (not shown).
The raw soil from which the soil having a predetermined size or more has been sorted and removed is transferred to the first supply port 10 of the first mixer 3 by the bucket 7 of the power shovel 2. This bucket 7 is the first supply port 1
When it is tilted after reaching 0, the raw material soil is supplied into the first mixer 3 shown in FIG. This operation is repeated until the first
When a predetermined amount of the raw material soil is accumulated in the mixer 3, water is subsequently supplied to the first mixer 3 according to the amount. Subsequently, the first motor 16 starts rotating, so that the first rotating shaft 12
Rotates, and the raw soil and water are stirred. When this stirring operation is performed for a predetermined period of time and sufficient muddy mud is formed, the bottom surface 17 of the first mixer 3 shown in FIG. 7 and FIG. Is discharged to the mud receiving tank 20 located at And this mud receiving tank 2
The mud stored at 0 is supplied to the supply pipe 24 and the supply pump 21.
Supplied to the first pipe 34 via the mud storage tank 3
0 is supplied.

The mud supplied in this way is stored in the mud storage tank 30 of the first tank. When the mud is almost full, the switching valve 37 is switched to connect the third pipe to the mud storage tank 30 of the second layer. 36. The muddy mud stored in this way is constantly stirred and prevented from hardening. When supplying the stored mud or mud from the mud receiving tank 20 to the mixer truck 5 as a transport vehicle, the first pipe 34 and the second pipe 35 are communicated with each other, and a pump (not shown) is connected. It is discharged from the second pipe 35 by operating. As a result, mud is supplied to the mixer vehicle 5 and can be carried out to the construction site.

On the other hand, the bottom surface 17 of the first mixer 3 is closed, and while the mud stored in one of the mud receiving tanks 20 is being taken out, the first raw material soil is supplied from the bucket 7 to the first mixer 3. Since the fixed amount is supplied, water is supplied again in accordance with this, and the stirring of the earth and sand is started. At this time, the other mud receiving tank 20 is located below the first mixer 3, so that the subsequently stirred mud can be discharged into this mud receiving tank 20. When the first mud receiving tank 20 is emptied and the discharging of mud to the other mud receiving tank 20 is completed, the mud receiving tank 20 is moved on the rail 23 and moved to a predetermined position to thereby continue the mud. Can be manufactured.

As described above, the mixer truck 5 to which mud is supplied.
To the second mixer 6 located at the construction site,
This is supplied to the second mixer 6 and subsequently a predetermined amount of solidified material is charged and stirred to obtain a backfill material. Then, when the backfill material is poured into the excavation groove 1 and a predetermined time has elapsed, the solidified material is solidified and the remaining soil of the excavated soil is placed thereon, whereby a solid roadbed is obtained.

In the above description, the solidified material is mixed with the mud at the construction site to obtain the backfill material. However, when the second mixer 6 cannot be installed at the construction site, or when the hardening is performed for a relatively long time. Is required, a predetermined amount of the solidified material is charged from the solidified material storage tank 50 through the charging port 11 simultaneously with the muddy water stirring in the first mixer 3, and the backfill material is kneaded. Will be obtained. Then, the backfill material thus obtained is carried to the construction site by the mixer truck 5 and is poured into the excavation trench 1 to enable backfill.

[0024]

As is clear from the embodiments described above, the present invention sieves and sorts excavated earth and sand in advance to obtain a raw material soil having a predetermined volume or less, and supplies a predetermined amount of the raw material soil. A first mixer 3 for supplying an appropriate amount of water adjusted in advance to the raw material soil from a water supply tank 4 and agitating them is arranged.
Then, the muddy mud stirred for a predetermined time is carried out to a desired place via a carry-out means, and the solidified material is put into the second mixer 6 installed at the desired place according to the amount of the muddy and the amount of the mud. In this method, a backfill material is obtained by mixing and kneading to obtain a backfill material, and the backfill material is poured into the excavation groove 1 from the outlet 45 of the second mixer 6. This reduces noise pollution such as noise generated by sorting excavated soil near a house or at midnight. In addition, the remaining soil due to the selection of excavated soil does not remain at the construction site. Further, since a hardened material having rapid hardening can be used, a restored road surface can be quickly obtained.

Another invention is the first mixer 3
The solidified material storage tank 50 is arranged close to the container, and a predetermined amount of solidified material is added in addition to the raw material soil and water, so that a backfill material can be obtained at a place away from the construction site. It is possible to carry out backfilling by simply carrying out this backfill material to the construction site and pouring it into the excavation trench, so that it is only necessary to bring the minimum machine to the construction site and minimize the generation of noise. it can.

Still another aspect of the present invention is a supply means for supplying raw material soil obtained by sieving and filtering excavated earth and sand to remove a predetermined amount or more of earth and sand, and disposed within a movable range of the supply means. A first mixer 3 to which the raw material soil is supplied from the supply means, a mud receiving tank 20 provided below the first mixer 3 and storing muddy water that has been stirred in a muddy state, and A water supply tank 4 provided so as to be capable of supplying a predetermined amount of water according to the supplied soil, a first supply port 10 for supplying the raw soil above the first mixer 3 and a first mixer 3 Solidified material storage tank 50 which is provided adjacent to the first mixer 3 and supplies the solidified material to the first mixer 3 as necessary.
And a transportation vehicle for carrying out mud from the first mixer 3, and a mud storage tank adjacent to the first mixer 3 and agitating and storing the mud-like mud in which the raw material soil and water are agitated as necessary. Since the excavated soil backfilling device is composed of the excavated soil 30 and the backfilling material, a backfilling material is obtained by supplying a solidified material at the backfilling site as needed, or a backfilling material is obtained outside the backfilling site. Can be selected, and appropriate work can be quickly performed according to the environment of the work site.

Further, since the backfilling material is produced by using the earth and sand excavated in the trench as it is, making it into a muddy state, and subsequently mixing it with a solidifying material, the backfill material is formed around the pipe laid in the excavation trench. Backfill material can be poured without gaps,
The backfilling operation time is reduced and the operator is not tired. In addition, the amount of residual soil to be discarded as industrial waste is reduced, so that waste of time and money can be eliminated, and effective utilization of earth and sand by excavation can be achieved. Further, since the conventionally required sand is no longer required, the work of transporting the sand to the site is not required, and the need to cut mountains and seasides to collect sand is reduced, and the destruction of the natural environment is also reduced. Moreover, since it is not necessary for the worker to pour the backfill material and then crush it, the burden on the worker can be reduced. Further, when the solidification occurs, the ground is stabilized, and the road and pavement are unlikely to sink or sink. In addition, there is no need to transport mixers and other equipment required for this work to the construction site, which reduces the number of transport vehicles and reduces the need to load and unload the machines, resulting in significant time and labor. Specific effects, such as a reduction in the number, can be obtained.

[Brief description of the drawings]

FIG. 1 is an overall front view showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a flowchart showing an entire manufacturing system.

FIG. 4 is a flowchart showing another manufacturing system as a whole.

FIG. 5 is a schematic diagram illustrating the manufacturing system of FIG. 3;

FIG. 6 is a schematic diagram illustrating the manufacturing system of FIG. 4;

FIG. 7 is a sectional front view of a main part of a second mixer.

FIG. 8 is a sectional front view of a main part of the first mixer.

FIG. 9 is a front view of a main part of the mud storage tank.

FIG. 10 is a front view of a second mixer.

FIG. 11 is a side view of the second mixer.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 excavation groove 2 power shovel 3 first mixer 4 water supply tank 5 mixer truck 6 second mixer 7 bucket 8 gantry 9 control unit 10 first supply port 11 inlet 12 first rotation shaft 13 turbine blade 14 rotor blade 15 suppression blade 16 First motor 17 Bottom surface 18 Discharge port 20 Mud receiving tank 21 Supply pump 22 Wheel 23 Rail 24 Supply pipe 30 Mud storage tank 31 Stirrer blade 32 Second rotating shaft 33 Second motor 34 First pipe 35 Second pipe 36 Third pipe 37 Switching valve 40 Second supply port 41 Third motor 42 Stirrer blade 43 Third rotating shaft 44 Bottom surface 45 Discharge port 46 Discharge valve 47 Discharge pipe 50 Solidified material storage tank 60 Water supply pipe

Claims (5)

[Claims] An excavated earth and sand is sieved and selected in advance to obtain a raw material soil having a predetermined volume or less, a predetermined amount of the raw material soil is supplied, and an appropriate amount adjusted and set in advance for the supplied raw material soil. A first mixer 3 for supplying water from the water supply tank 4 and stirring the water is arranged, and the muddy mud stirred by the first mixer 3 for a predetermined time is carried out to a desired place via a carrying-out means. Then, the mud and the solidifying material are added to the second mixer 6 installed at the desired place in accordance with the amount of the mud, and these are kneaded to obtain a backfill material. A backfill method characterized by pouring backfill material from an outlet 45 and performing backfill. 2. Excavated earth and sand is sieved and sorted in advance to obtain a raw material soil having a predetermined volume or less, a predetermined amount of the raw material soil is supplied, and an appropriate amount adjusted and set in advance for the supplied raw material soil. Is supplied from a water supply tank 4 and a solidifying material is charged according to the amounts of the raw material soil and water, and a first mixer 3 for stirring and kneading them is arranged.
A backfilling method characterized in that the muddy backfill material stirred and kneaded for a predetermined time in the mixer 3 is carried out to a desired place via a carrying-out means, and the backfill material is poured into the desired place to perform backfilling. . 3. A supply means for supplying a raw soil obtained by sieving and filtering excavated earth and sand to remove a predetermined amount or more of earth and sand, and disposed within a movable range of the supply means and provided from the supply means. A first mixer 3 to which the raw material soil is supplied, and a water supply tank 4 provided so as to be able to supply water by a predetermined amount set in advance according to the raw material soil supplied to the first mixer 3; A first supply port 10 to which the raw material soil is supplied is located above the mixer 3 and is provided adjacent to the first mixer 3 and solidifies into the first mixer 3 in a predetermined amount as necessary. An apparatus for manufacturing a backfill material, comprising a storage silo 50 and a transport vehicle for carrying mud or backfill material from the first mixer 3. 4. The backfill material producing apparatus according to claim 3, wherein the first mixer is provided with a mud receiving tank 20 for storing muddy water-mixed mud. 5. The muddy mud obtained by stirring the raw material soil and water in the first mixer is stored in the adjacent mud storage tank 30 with stirring as necessary. Backfill material manufacturing equipment.