JP7371313B2 - Fluidized soil supply system - Google Patents

Description

The present invention relates to a fluidized soil supply system.

Fluidized soil has fluidity and self-filling properties, so it can be backfilled into narrow spaces, and since it does not require compaction or compaction, it is a backfilling method with excellent workability. It is used as a material. Furthermore, since the fluidized soil contains a solidification agent, uneven settlement can be suppressed. In addition, fluidized soil does not exhibit high strength like concrete and can be dug up, which may cause problems when constructing new structures in areas that have been backfilled with fluidized soil. It's hard to become. Because of these advantages, the amount of fluidized soil used is increasing.
As a method for supplying such fluidized soil, for example, Patent Document 1 discloses a method in which a predetermined amount of mud is put into a mixing drum of a truck mixer (agitator vehicle), and then cement and water are mixed in a ready-mixed concrete manufacturing plant. A method is disclosed in which the cement paste obtained by this process is put into the mixing drum, and then transported to the backfilling site by the truck mixer while stirring and mixing the mud and cement paste in the mixing drum.
However, in the fluidized soil supply method of Patent Document 1, in each of the step of introducing mud in a mud manufacturing plant and the step of introducing cement paste in a ready-mixed concrete manufacturing plant, a truck mixer is parked and materials are loaded. There is a need. Therefore, it takes time and effort to load materials into the truck mixer. In addition, in ready-mixed concrete manufacturing plants, materials are directly dumped from the plant into truck mixers, so even if multiple truck mixers are used to transport fluidized soil, it takes time to change truck mixers. It will take a while. In the fluidized soil supply method of Patent Document 1, in which materials are directly input from the plant into a truck mixer, it is necessary to stop material production at the plant while replacing the truck mixer, which maximizes the use of plant capacity. Can not do it.

JP 2017-160595 Publication

An object of the present invention is to propose a fluidized soil supply system that makes it possible to shorten the construction period.

The fluidized soil supply system of the present invention for solving the above problems includes a storage tank for storing fluidized soil, a transport pipe extending from the storage tank, and a fluidized soil supply system through which the fluidized soil is supplied via the transport pipe. The system includes a pump that pumps the treated soil to the trunk mixer, and a pedestal to which the transport pipe is attached . A plurality of the truck mixers can be parked in front of the pedestal, and the discharge port of the transport pipe is movably provided with respect to the pedestal so that it can be disposed above the input port of the truck mixer. The pedestal is provided with a plurality of discharge ports so that the fluidized soil can be simultaneously supplied to a plurality of truck mixers. According to this fluidized soil supply system, fluidized soil can be supplied to multiple truck mixers simultaneously or continuously by increasing the number of pumps or branching the transport pipes. The effort and time required for replacement can be omitted. Furthermore, since the fluidized soil can be stored in the storage tank, even if the truck mixer is replaced, there is no need to stop production of the fluidized soil when the truck mixer is replaced.

If an on-site storage tank for storing the fluidized soil provided at the pouring site is further provided, the fluidized soil can be poured at any timing. Therefore, there is no need to adjust the timing of production and transportation of fluidized soil depending on the timing of pouring of fluidized soil on site, and the capacity of the plant can be utilized to the fullest.
Further, the transport pipe is provided with a pedestal to which the transport pipe is attached, and is movable with respect to the pedestal so that the discharge port of the transport pipe can be placed above the input port of the truck mixer. Piping becomes easier, and the efficiency of supplying fluidized soil to truck mixers improves.

The fluidized soil supply system includes a weighing machine that measures the weight of mud to be supplied to the storage tank, a cement silo that supplies cement to the storage tank, and an amount of cement that is supplied according to the weight of the mud. It is desirable that the cement silo is provided with a control means for controlling the supply port of the cement silo. According to this fluidized soil supply system, it is possible to automatically supply cement according to the weight of mud, so high quality fluidized soil can be easily produced.
Further, a plurality of the truck mixers can be parked in front of the pedestal, and the pedestal is provided with a plurality of truck mixers so as to be able to simultaneously supply the fluidized soil to the plurality of truck mixers. Since the discharge port is provided , it becomes possible to supply fluidized soil more efficiently.

According to the fluidized soil supply system of the present invention, it is possible to efficiently supply fluidized soil, and as a result, it is possible to shorten the construction period.

1 is a flowchart showing a method for supplying fluidized soil according to the present embodiment. FIG. 1 is a schematic diagram showing an overview of a fluidized soil supply system according to the present embodiment.

In this embodiment, a method for supplying fluidized soil in the case of forming a columnar ground improvement body using fluidized soil will be described. As shown in FIG. 1, the method for supplying fluidized soil of this embodiment includes a manufacturing process S1, a storage process S2, a loading process S3, a transportation process S4, an on-site storage process S5, and a supply process S6.
In this embodiment, the fluidized soil supply system 1 is used to manufacture and supply fluidized soil to the pouring site.
As shown in FIG. 2, the fluidized soil supply system 1 of this embodiment includes a desilting tank 2, a cement silo 3, a control means 4, a screw conveyor 5, a storage tank 6, and a transport pipe 7. , a pedestal 8, and an on-site storage tank 9.

The desilting tank 2 is a container for manufacturing mud. In this embodiment, a vessel, which is a metal box with an open top, is used as the desilting tank 2. Although the size of the desilting tank 2 is not limited, it has at least a size that allows a bucket of a backhoe to be inserted therein to stir the contents. Note that the desilting tank 2 may be configured by, for example, a tank in addition to a vessel.
The cement silo 3 stores a solidification material (cement) that is input when producing fluidized soil. The opening and closing of the supply port 31 of the cement silo 3 is controlled by a control means 4.
The control means 4 controls the supply port 31 of the cement silo 3 so as to supply the screw conveyor 5 with cement in an amount corresponding to the weight of the mud.
The screw conveyor 5 mixes mud and cement to generate a mixture, and supplies the generated mixture to a storage tank 6. A measuring device 52 is provided at the input port 51 of the screw conveyor 5. The meter 52 is connected to the control means 4.
The storage tank 6 stores fluidized soil. The mixture of mud and cement supplied via the screw conveyor 5 is further mixed in the storage tank 6 and stored as fluidized soil. In this embodiment, a large vessel is used as the storage tank 6, but the storage tank 6 may be configured by, for example, a tank in addition to the vessel.
The transport pipe 7 is a conduit extending from the storage tank 6 to the truck mixer 10. One end of the transport pipe 7 is connected to a pump P provided in the storage tank 6, and the other end of the transport pipe 7 is attached to a pedestal 8. Pump P pumps the fluidized soil through transport pipe 7 to truck mixer 10 .
The pedestal 8 functions as a scaffold for workers when supplying fluidized soil to the truck mixer 10. A transport pipe 7 is attached to the frame 8. The pedestal 8 of this embodiment is formed by combining bitty scaffolds.
The on-site storage tank 9 is provided at the site where the fluidized soil is placed, and stores the fluidized soil transported by the truck mixer 10. In this embodiment, a large vessel is used as the on-site storage tank 9, but the on-site storage tank 9 may be configured by, for example, a tank in addition to the vessel.

In the manufacturing process S1, fluidized soil is manufactured.
First, mud is produced in the desilting tank 2. Earth and sand is supplied to the desilting tank 2 using the first backhoe 11. In the desilting tank 2, water supplied from the water tank and earth are mixed to produce mud. In this embodiment, clayey soil is used as the earth and sand. The amount of water supplied from the tank is determined appropriately depending on the amount of soil. That is, the amount of soil is estimated from the number of buckets supplied by the first backhoe 11, and water corresponding to this amount of soil is supplied from the water tank. The earth and sand and water in the desilting tank 2 are stirred by a second backhoe 12. Note that the method of stirring the earth and sand is not limited, and a machine other than the second backhoe 12 (for example, a rotary stirrer or the first backhoe 11) may be used for stirring.

Next, the mud whose water content has been adjusted is supplied from the desilting tank 2 to the storage tank 6. In this embodiment, cement is supplied when the mud is sent to the storage tank 6 by the screw conveyor 5. The mud produced in the desilting tank 2 is supplied to a screw conveyor 5 by a pump. Further, a cement silo 3 that stores cement to be supplied to a storage tank 6 is connected to the screw conveyor 5.
The mud produced in the desilting tank 2 is first supplied to a vibrating sieve 53 to remove relatively large aggregates (for example, diameters of 40 mm or more) and foreign substances (for example, wood chips). The mud that has passed through the vibrating sieve 53 is discharged from the bottom of the vibrating sieve 53, and then pumped to the input port 51 of the screw conveyor 5 by a stationary pump. A measuring device 52 is provided at the input port 51 of the screw conveyor 5. The weighing device 52 measures the weight of the mud supplied from the desilting tank 2 to the input port 51 of the screw conveyor 5. The measuring device 52 is connected to the control means 4, and the measurement result by the measuring device 52 is transmitted to the control means 4. The opening and closing of the supply port 31 of the cement silo 3 is controlled by a control means 4. The control means 4 opens and closes the supply port 31 of the cement silo 3 so that an amount of cement corresponding to the weight of the mud measured by the scale 52 is supplied to the screw conveyor 5. The mud supplied from the desilting tank 2 and the cement supplied from the cement silo 3 are mixed in the screw conveyor 5 and thrown into the storage tank 6. In the storage tank 6, the mud and the solidification material are further stirred and mixed using the third backhoe 13, thereby producing fluidized soil.

In the storage step S2, the fluidized soil produced in the manufacturing step S1 is stored in the storage tank 6. In the storage step S2, the third backhoe 13 performs appropriate stirring to prevent the fluidized soil from hardening.

In the loading step S3, fluidized soil is pumped from the storage tank 6 to the truck mixer 10. In this embodiment, the fluidized soil is supplied to the truck mixer 10 using the transport pipe 7 extending from the storage tank 6. The transport pipe 7 is attached to a pedestal 8. The discharge port 71 of the transport pipe 7 is arranged at the input port of the truck mixer 10. Note that the discharge port (tip end) 71 of the transport pipe 7 is provided movably relative to the pedestal 8 so that it can be placed above the input port of the truck mixer 10. When the truck mixer 10 stops in front of the pedestal 8, a worker moves the input port of the truck mixer 10 to the discharge port 71 of the transport pipe 7, and starts pumping the fluidized soil. That is, the pedestal 8 supports the transport pipe 7 and also functions as a scaffold for the worker. A plurality of truck mixers 10 can be parked in front of the gantry 8 of this embodiment. Further, the pedestal 8 is provided with a plurality of discharge ports 71 so that fluidized soil can be supplied to a plurality of truck mixers 10 at the same time. The plurality of discharge ports 71 may be the tips of a plurality of transport pipes 7 extending from the storage tank 6, or may be the ends of branch pipes branched from one transport pipe 7. When branch pipes are used, it is desirable to selectively use the branch pipes to be supplied using a valve or the like.
In this embodiment, a pump cleaning tank 61 is provided adjacent to the storage tank 6. After use, the pump P is appropriately cleaned in the pump cleaning tank 61, since the fluidized soil inside the pump P will harden and become clogged if left unattended.

In the transportation step S4, the fluidized soil is transported to the pouring site by the truck mixer 10.
In the on-site storage step S5, the fluidized soil is stored in an on-site storage tank 9 provided at the pouring site. That is, the fluidized soil transported by the truck mixer 10 is put into the on-site storage tank 9 using the chute of the truck mixer 10, and is temporarily stored there. The fluidized soil placed in the on-site storage tank 9 is stirred as necessary to prevent it from hardening.

In the supply step S6, fluidized soil is supplied from the on-site storage tank 9 to the pouring location. The on-site storage tank 9 is provided with a pump P, which pumps and pumps the fluidized soil through a conduit leading from the on-site storage tank 9 to the pouring location. In addition, when pouring the fluidized soil at the pouring location at the timing when it is brought in by the truck mixer 10, it is possible to place the fluidized soil into the on-site storage tank 9 and then supplying it to the pouring location. Alternatively, it may be supplied directly from the truck mixer 10 to the pouring location. In this embodiment, a pump cleaning tank 91 is provided adjacent to the on-site storage tank 9. After use, the pump P is appropriately cleaned in the pump cleaning tank 91, since the fluidized soil inside the pump P will harden and become clogged if left unattended.
In this embodiment, fluidized soil is poured into a pit formed using the casing 15 (inner space of the casing 15) from the bottom using the tremie pipe 14. The tremie pipe 14 is raised as the upper surface of the fluidized soil rises as the fluidized soil is cast. After filling the casing (vertical hole) 15 with fluidized soil, the casing 15 is pulled out to form a columnar improved body.

According to the fluidized soil supply method and the fluidized soil supply system 1 of the present embodiment, fluidized soil can be efficiently manufactured with equipment using general-purpose machinery without using complicated equipment. We can even supply it. Therefore, equipment costs can be reduced compared to conventional manufacturing plants.
Since the produced fluidized soil is not immediately put into the truck mixer 10 but is temporarily stored in the storage tank 6, the fluidized soil production plant can be utilized to the fullest. That is, there is no need to interrupt the production of fluidized soil in response to the arrival of the truck mixer 10 or replacement of the truck mixer 10. In this way, since the production capacity of fluidized soil can be utilized to the maximum, there is no waiting time in the production work of fluidized soil, and as a result, the efficiency of construction can be improved. In addition, even in urban areas where it is not possible to produce fluidized soil at night, construction work can be carried out at night by mixing retardant with the fluidized soil produced during the day and storing it in the storage tank 6. It becomes possible.

In addition, in order to supply the stored fluidized soil to the truck mixer 10 by pumping it through the transport pipe 7, the number of pumps P can be increased or the transport pipe 7 can be branched to supply a plurality of truck mixers 10. The fluidized soil can be added simultaneously or consecutively. Therefore, compared to the case where the truck mixer 10 is placed on standby under the plant, the effort and time required to replace the truck mixer 10 can be omitted.
In addition, since a portable pump P is used to transport the fluidized soil, if a mesh material with a predetermined mesh (e.g. 20 mm) is provided at the intake port of the pump P, large aggregates (e.g. , diameter of 40 mm or more) and foreign matter can be prevented from being mixed in, and a high-quality improved body can be manufactured. Moreover, by doing so, the pump P at the pouring site will not be clogged with large aggregates or foreign matter during pump pumping. Further, by using the electric pump P, noise and vibration can be reduced. Further, when a stationary pump (pump truck) is used, a special worker is required, but if a portable pump P is used, the need for a special worker can be omitted.
In addition, since the materials need only be charged into the truck mixer 10 once, including the fluidized soil, the amount of work required and time is reduced compared to the case where mud and cement paste are charged separately into the truck mixer 10. Can be omitted.

Moreover, since a plurality of truck mixers 10 can be parked in front of the gantry 8, the effort required to replace the truck mixers 10 can be omitted. Further, the number of guides for replacing the truck mixer 10 can be omitted or reduced.
In addition, in order to input the fluidized soil from the input port of the truck mixer 10 using the transport pipe 7 attached to the pedestal 8, a worker installs the transport pipe 7 from above the pedestal 8 into the input port of the truck mixer 10. Therefore, work efficiency is improved compared to the case where the transport pipe 7 is installed every time the truck mixer 10 stops. Moreover, since the discharge port 71 of the transport pipe 7 is movably attached to the pedestal 8, it is easy to guide the discharge port 71 of the transport pipe 7 to the input port of the truck mixer 10.

The fluidized soil supply system 1 supplies cement in an amount corresponding to the weight of mud by the control means 4, so that high quality fluidized soil can be easily produced.
Since cement is supplied to the storage tank 6 in a state mixed with mud via the screw conveyor 5, compared to the case where cement is supplied to the storage tank 6 and fluidized soil is manufactured in the storage tank 6, Fluidized soil can be easily produced.
In addition, since the fluidized soil is produced by stirring mud and cement in the storage tank 6, there is no need to secure a separate space for producing the fluidized soil, making it possible to save space in the plant. can.
Furthermore, since the on-site storage tank 9 is provided at the pouring site, the fluidized soil can be poured at any timing. Therefore, there is no need to adjust the timing of production and transportation of fluidized soil depending on the timing of pouring of fluidized soil on site, and the capacity of the plant can be utilized to the fullest. Furthermore, there is no need to wait for the fluidized soil to arrive at the site, and construction can be carried out efficiently.

Although the embodiments according to the present invention have been described above, the present invention is not limited to the above-described embodiments, and each of the above-mentioned components can be modified as appropriate without departing from the spirit of the present invention.
In the embodiment described above, the fluidized soil (mixture of mud and cement) is stirred in the storage tank 6 by the third backhoe 13, but the device for stirring in the storage tank 6 is not limited. do not have. For example, stirring may be performed using a rotary stirrer, or vibration may be applied to the storage tank 6.
A retardant may be added to the storage tank 6 and the on-site storage tank 9 if necessary.
In the embodiment described above, the fluidized soil is pumped from the storage tank 6 to the truck mixer 10 using the portable pump P, but the fluidized soil is pumped to the truck mixer 10 by a stationary pump. You may go. Similarly, when supplying the fluidized soil from the on-site storage tank 9 to the pouring site, a stationary pump may be used instead of the portable pump P.
In the embodiment described above, the fluidized soil is transported to the pouring site by the truck mixer 10, but a transport pipe 7 is piped from the storage tank 6 to the pouring site, and the fluidized soil is transported to the storage tank 6. It may also be pumped to the pouring site. At this time, the fluidized soil may be supplied to the on-site storage tank 9 or directly to the pouring location. Further, the pump P used for pump pressure feeding may be a portable type or a stationary type.
If fluidized soil remains in the storage tank 6, it may be returned to the desilting tank 2 and reused by adding water.
The vibrating sieve 53 may be used as necessary. Furthermore, the method of transportation from the vibrating sieve 53 to the screw conveyor 5 is not limited to pumping using a stationary pump; for example, pumping may be performed using a portable pump, or gravity may be used.
The scale of the pedestal 8 and the material forming the pedestal 8 are not limited. Further, the pedestal 8 may be used as necessary.
In the embodiment described above, fluidized soil is produced by mixing mud and cement, but mud may be mixed with cement paste, mortar, or the like.

1 Fluidized soil supply system 10 Truck mixer 2 Desilting tank 3 Cement silo 31 Supply port 4 Control means 5 Screw conveyor 52 Measuring device 6 Storage tank 7 Transport pipe 71 Discharge port 8 Frame 9 On-site storage tank P Pump

Claims (3)

a storage tank for storing fluidized soil;
a transport pipe extending from the storage tank;
a pump that pumps the fluidized soil to a truck mixer via the transport pipe;
A fluidized soil supply system comprising : a frame to which the transport pipe is attached ;
A plurality of the truck mixers can be parked in front of the pedestal,
The discharge port of the transport pipe is movably provided with respect to the pedestal so that it can be placed above the input port of the truck mixer,
The fluidized soil supply is characterized in that the mount is provided with a plurality of the discharge ports so that the fluidized soil can be simultaneously supplied to a plurality of the truck mixers. system. The fluidized soil supply system according to claim 1 , further comprising an on-site storage tank provided at a pouring site to store the fluidized soil. a measuring device for measuring the weight of mud supplied to the storage tank;
a cement silo that supplies cement to the storage tank;
The fluidized soil according to claim 1 or 2 , further comprising a control means for controlling a supply port of the cement silo so as to supply an amount of cement according to the weight of the mud. supply system.

Images