JP2000120101A - On-vehicle drilled soil processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively improve soil even if the moisture ratio of the drilled soil is high by supplying hot air to the falling route of the drilled soil from a hopper to dry the drilled soil under the condition of dispersedly falling. SOLUTION: On the falling route of soil from a roll screen, a stirring device 3 having stirring arms 3a rotating aroung horizontal shafts for stirring the falling soil is provided. In the string device 3, the stirring arm 3a is formed into a hollow tubular shape, hot air supply passages 5 are formed in hollow parts in stirring shafts 3b arranged for the horizontal shafts and the stirring arms 3a, and a plurality of hot air jet ports 4d are formed on the rear parts in the rotating direction of the stirring arms 3a. Further on the carrying route of a carrying device 3, a lime supply device supplying lime as a soil improving agent to the carried soil is provided. Consequently, dried soil effectively falls on the carrying device, and soil can be dried even if it is coagulative drilled soil of high moisture ratio.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for removing excavated soil when burying gas pipes, water and sewage pipes or the like in the ground, or when digging a ground where pipes are already buried and burying pipes again. More specifically, the present invention relates to a vehicle-mounted excavated soil treatment apparatus for processing for reuse, a hopper for receiving excavated soil, a transport device for transporting the excavated soil received in the hopper to a mixing device, and a transport device for the transport device. The present invention relates to a vehicle-mounted excavated soil treatment apparatus in which a lime supply device that supplies lime to soil to be conveyed is mounted on a vehicle. Incidentally, the ash supplied to the soil is the soil mixed with the soil, that is, the excavated soil by the mixing device.

[0002]

2. Description of the Related Art Conventionally, a large amount of excavated soil is generated in construction work for excavating the ground in public works or the like. In order to treat this large amount of excavated soil, landfill disposal has been performed, but in recent years the disposal process has been reviewed due to the problem of waste disposal, and there is a tendency to reuse these excavated soil as much as possible. is there. In order to reuse this large amount of excavated soil, a large-scale regeneration plant is used. In order to transfer the excavated soil to a limited installation location of the regeneration plant, stockyards are once dispersed and installed at many locations. Thus, excavated soil generated at a construction site is temporarily deposited in these stock yards, and is collectively transferred to the regeneration plant.

[0003]

In the above-mentioned conventional excavated soil treatment, a large area of a stock yard is required,
Further, there is a problem that soil transport from a construction site to a stock yard to a recycling plant to a reuse construction site is required, and an unnecessarily large land area and a soil transport distance are required.
Therefore, it is conceivable to backfill the excavated soil at the excavation work site. For this purpose, it is necessary to treat the excavated soil. It is difficult to secure. Therefore, an on-board type excavated soil treatment device has been proposed as a measure for solving the problem of securing land. For example, as disclosed in Japanese Utility Model Publication No. 8-9232, a hopper, a crusher, a soil conditioner supply device,
A vehicle equipped with a mixer and a belt conveyor for transporting soil between them on a chassis of a vehicle has been proposed as a vehicle equipped with a soil recycling apparatus. As the soil recycling device, the excavated soil is received in a hopper, dropped into the crusher, the crushed soil is discharged from the crusher onto a first belt conveyor, and the discharged soil is supplied to a mixer. Adding a soil conditioner such as lime into the mixer from the soil conditioner supply device,
There is shown an example in which a soil conditioner such as lime is mixed with soil to discharge the improved soil onto a second belt conveyor.

[0004] However, in the proposed soil recycling apparatus, when the excavated soil has caking properties or has a high water content, a nodule is formed on the first belt conveyor, However, there is a problem that a nodule is formed and the soil conditioner cannot be mixed uniformly, and an excessive amount of the soil conditioner is required. Further, as a result of the formation of the baby lump, there is a case where the transportation cannot be performed stably.

Accordingly, an object of the present invention is to provide a vehicle-mounted excavated soil treatment apparatus capable of efficiently improving soil even if the excavated soil has a high water content.

[0006]

[Means for Solving the Problems] A first characteristic structure of the vehicle-mounted excavated soil treatment apparatus according to the first aspect of the present invention is as follows. The point is that a hot air supply device for blowing hot air toward falling soil is provided.

A second feature of the vehicle-mounted excavated soil treatment apparatus according to the second aspect of the present invention is that the hot air supply device in the first feature configuration utilizes heat of exhaust gas from an engine of a vehicle. It is in.

According to a third aspect of the present invention, there is provided a vehicle-mounted excavated soil treatment apparatus according to the first aspect, wherein the falling soil is agitated on a falling path from the hopper to the transfer device in the first aspect or the second aspect. A stirring device provided with a hollow stirring arm rotating about a horizontal axis for forming a hot air supply path in the stirring arm and forming a plurality of hot air injection ports for injecting hot air into the stirring arm. And the said point is that the said stirring apparatus is comprised in the said hot-air supply apparatus.

According to a fourth aspect of the present invention, there is provided a vehicle-mounted excavated soil treatment apparatus according to the fourth aspect, wherein the hot air injection port in the third aspect is formed so as to face backward in the rotation direction of the stirring arm. is there.

[Operation and Effect of Characteristic Configuration] According to the first characteristic configuration of the vehicle-mounted excavated soil treatment apparatus according to the present invention,
While the lime consumption can be reduced, the soil can be sufficiently modified. In other words, hot air is supplied to the falling path of excavated soil from the hopper and dried in a state of falling discretely, so that the dried soil falls efficiently on the transport device and the coagulum with a high moisture content Even excavated soil is dry, the water content of the soil is reduced at the lime supply position, and the lime is easily mixed. Therefore, a small amount of lime for drying the soil is required, and the lime can be uniformly mixed.

According to the second aspect of the vehicle-mounted excavated soil treatment apparatus according to the present invention, energy consumption can be reduced in addition to the operation and effect of the first aspect. In other words, the heat of the exhaust gas from the engine of the vehicle equipped with the excavated soil treatment device is used to dry the excavated soil, and this engine needs to be operated in order to operate the treatment device. Therefore, the waste heat is effectively used.

According to the third aspect of the on-board type excavated soil treatment apparatus according to the present invention, the excavated soil can be effectively dried and crushed at the same time, and the operation and effect of the first or second aspect can be achieved. To enable more. In other words, by providing the stirring device at the hot air blowing position in the falling path from the hopper to the transfer device, the excavated soil is agitated while drying, so that the excavated soil to be dried can be loosened and crushed while drying. . Since this stirring is performed by a stirring device in which the stirring arm rotates around the horizontal axis, by supplying hot air from the stirring arm, hot air is blown into the excavated soil in the falling path, and the excavated soil is removed. As a result, the excavated soil passing through the falling path can be uniformly crushed and agglomerated.

According to the fourth aspect of the vehicle-mounted excavated soil treatment apparatus according to the present invention, the maintenance of the stirring arm is facilitated while further enhancing the operation and effect of the third aspect. That is, since the hot-air injection port is formed to face backward in the rotation direction of the stirring arm, hot air is blown into the gap in the excavated soil through which the stirring arm has passed, and excavation is performed from the gap toward the periphery. The excavated soil can be effectively dried by infiltrating the hot air into the soil, and the crushing effect by the stirring arm can be promoted by the infiltration of the hot air. Further, when the stirring arm is rotated, the hot air injection port is provided behind the rotation, so that it is difficult to contact the soil to be stirred, so that the hot air injection port can be prevented from being clogged with the soil.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a vehicle-mounted excavated soil treatment apparatus according to the present invention will be described. FIG. 1 is a side view showing an example of a vehicle equipped with a vehicle-mounted excavated soil treatment apparatus according to the present invention, FIG. 2 is a plan view showing a working state of the mounted vehicle shown in FIG. 1, and FIG. FIG. 4 is a longitudinal sectional view of a main part, and FIG.
FIG. 2 is a perspective view showing a configuration of a main part thereof.

As shown in FIGS. 1 and 2, the excavated soil treatment apparatus according to the present invention comprises a hopper 1 for receiving excavated soil, and a large lumps of the excavated soil received in the hopper 1 by a preliminary sieving device 2. After that, the conveying device 6 that conveys to the sieving device 9 via the mixing device 8 and the lime supply device 7 that supplies lime as a soil conditioner to the conveyed soil through the conveying path of the conveying device 6 Are mounted on the vehicle 10. The preliminary sieving device 2 is configured by a roll screen 2A for separating rubble such as concrete blocks and rock pieces in excavated soil. Further, a hot air supply device 4 for blowing hot air toward the falling soil is provided on a fall path of the excavated soil from the roll screen 2A to the transport device 6. The hot-air supply device 4 is connected to an exhaust pipe 11 from the engine of the vehicle 10 by an exhaust heat exchanger 4 b that constitutes the hot-air supply device 4.
And an air source 4a for hot air using an air compressor.
Is heated using the heat of the exhaust gas and blown into the falling path. A belt conveyor 6A is arranged as the transporting device 6 for feeding the excavated soil received from the hopper 1 to the mixing device 8, and the soil discharged by mixing the soil conditioner from the mixing device 8 is discharged outside the vehicle. A sub-conveyor 6 </ b> B that feeds out toward the installed sieve device 9 is provided below the mixing device 8. This sub-conveyor 6B also constitutes the transport device 6.

As shown in FIG. 3, a stirrer 3 having a stirrer arm 3a rotating around a horizontal axis for stirring the falling soil is provided on a path for falling the soil from the roll screen 2A. is there. The stirring device 3 is provided with the stirring arm 3
a is formed in a hollow tubular shape, a hot air supply path 5 is formed in a hollow portion inside the hollow stirring shaft 3b and the stirring arm 3a arranged on the horizontal axis, and a plurality of hot air injection ports 4d for injecting hot air are formed.
Are formed rearward in the rotation direction of the stirring arm 3a (see FIG. 4). A swivel joint is provided at one end of the stirring shaft 3b, and is connected to a hot air supply pipe 4c for guiding hot air from the exhaust heat exchanger 4b. That is, the hot air supply device 4 includes the hot air air source 4a, the exhaust heat exchanger 4b, an air supply path from the hot air air source 4a to the exhaust heat exchanger 4b, and the hot air supply pipe 4c. And the hot air injection port 4d.

The reformation of excavated soil by the above-described on-board type excavated soil treatment apparatus is performed in a workplace near a construction site as follows. In addition to the above devices, the working vehicle 10 has an improved soil delivery conveyor 9b loaded above the equipment. Prior to the operation, a vibrating sieve 9A mounted on the vehicle as the sieve device 9 is mounted on a support base 9a also mounted on the vehicle.
Together with the vibrating screen 9 on the support base 9a.
A is placed on the sub-conveyor 6B and is placed at a position for receiving the soil after the reforming. The sub-conveyor 6B is installed in the vehicle width direction of the work vehicle 10, and is configured so that the transport direction can be switched back and forth. Therefore, the vibrating sieve 9A can be arranged on a side convenient for backfilling. Then, the improved soil delivery conveyor 9b separately mounted on the vehicle is arranged at a position suitable for delivering the improved soil below the vibrating sieve 9A.

The excavated soil put into the hopper 1 descends in the hopper 1 and reaches the roll screen 2A. The roll screen 2A is set with a roll having a sieve size of 100 mm, for example. Therefore, the input excavated soil is
Rubble having a size of 100 mm or less and exceeding 100 mm is discharged to the ground via a guide plate 2a attached to the roll screen 2A. On the other hand, the soil under the sieve of the roll screen 2A is stirred by the rotation of the stirring arm 3a of the stirring device 3 provided on the lower drop path, and simultaneously heated by the hot air from the hot air injection port 4d to remove water. Release. The thus dried soil is further crushed by the stirring by the stirring arm 3a and the pressure of the hot air, thereby facilitating the subsequent reforming operation.

The excavated soil dried through the stirring device 3 is conveyed to the mixing device 8 by the belt conveyor 6A. A lime supply device 7 for adding carbonated lime, quick lime, or slaked lime as a soil conditioner to the excavated soil is disposed on the belt conveyor 6A. The lime supply device 7 includes a lime container 7a for temporarily storing lime powder to be supplied, and a lime supply unit 7b for cutting out lime powder in the lime container 7a and supplying the cut lime powder to excavated soil on the belt conveyor 6A. I have. A predetermined amount of lime powder is supplied from the lime supply unit 7b onto the excavated soil conveyed on the belt conveyor 6A, and is supplied to the mixing device 8 together with the excavated soil. In the mixing device 8, a mixing roller is rotating, whereby the excavated soil and the lime powder are stirred and mixed. As described above, since the excavated soil put into the mixing device 8 has released water regardless of the water content at the time of excavation, it can be easily mixed, and there is no need to make the mixing amount of lime powder excessive. Moreover, because the water content of the soil is low,
The load on the mixing device 8 is also greatly reduced.

The mixture of the crushed excavated soil and the lime powder is discharged onto the sub-conveyor 6B as improved soil.
The sub-conveyor 6B sends the improved soil to the vibrating sieve 9A, further mixes and classifies the soil, and sends it out as backfilled soil by the improved soil delivery conveyor 9b. Since the improved soil sent out in this way does not contain lime more than necessary, it is a good backfill material. In addition, since the water content of the improved soil is low, the backfill work is also facilitated.

[Alternative Embodiment] <1> In the above embodiment, an example in which a vehicle-mounted air compressor is used as the hot-air air source 4a has been described. However, the hot-air air source 4a uses other means. For example, a brake air compressor of the vehicle 10 may be used, or air from a brake air reservoir may be used. <2> In the above embodiment, the roll screen 2
A description has been given of an example in which a stirring device 3 having a stirring arm 3a rotating around a horizontal axis for stirring the falling soil is provided on the falling path of the soil after crushing from A. May be provided in the mixing device 8 for mixing the earth and sand fed from the terminal end of the transport device 6 with the soil conditioner. <3> In the above embodiment, since the stirring device 3 functions as the hot air supply device 4, the hot air supply passage 5 is provided in the hollow portion inside the hollow stirring shaft 3 b and the stirring arm 3 a arranged on the horizontal axis.
And a plurality of hot air jets 4 for jetting hot air
Although the example where d is formed toward the rotation direction rear of the stirring arm 3a has been described, for example, as shown in FIG.
Hot air nozzle pipe 4A attached to the tip of hot air supply pipe 4c
Is placed below the preliminary sieve device 2 and its hot air injection port 4d
Hot air may be blown into the soil from above. <4> In the above-described embodiment, an example has been described in which the plurality of hot air injection ports 4d for injecting hot air into the soil falling from the preliminary sieving device 2 are formed rearward in the rotation direction of the stirring arm 3a. The position of the hot air injection port 4d is determined for the purpose of preventing clogging with earth and sand, and may be formed on the side of the stirring arm 3a.
Further, if a sufficient hot air pressure can be maintained, the hot air injection port 4d may be formed in the rotation direction of the stirring arm 3a in the front. <5> In the above embodiment, the roll screen 2
A description has been given of an example in which the hot-air supply device 4 that blows hot air toward the falling soil is provided on the falling path of the excavated soil from A to the transport device 6. As shown in FIG. 6, it may be provided in the mixing device 8. Hot air jet 4 as hot air blowing means
d is provided in the stirring device 3, and the stirring device 3 described in the above embodiment is provided inside the mixing device 8. In this case, the falling path of the excavated soil from the hopper 1 includes: The hot air nozzle tube 4A described in the above <3> may be arranged as the hot air blowing means. Instead of such a configuration, for example, as shown in FIG. 7, without providing the stirring device 3 in the mixing device 8, the same mixing device 8 as described in the above <3> is provided in a normal mixing device 8. The hot air nozzle tube 4A may be arranged as hot air blowing means. <6> In the above embodiment, an example was described in which the exhaust pipe 11 from the engine of the vehicle 10 was provided with the exhaust heat exchanger 4b constituting the hot air supply device 4. However, as the heat source of the hot air supply device 4, Can employ other heating means, for example, using a compressor having a high compression ratio as the hot air air source 4a and utilizing the temperature rise of the air accompanying the compression. <7> In the above-described embodiment, an example has been described in which the lime supply device 7 for adding carbonated lime, quick lime, or slaked lime as a soil conditioner to the excavated soil is disposed on the belt conveyor 6A. The position where the lime supply device 7 is arranged may be different. For example, lime powder may be directly input to the mixing device 8 as a soil conditioner and mixed with the excavated soil from the transport device 6.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of a vehicle-mounted excavated soil treatment apparatus according to the present invention.

FIG. 2 is a plan view of the on-board excavated soil treatment apparatus shown in FIG.

FIG. 3 is a side view of a main part of the vehicle-mounted excavated soil treatment apparatus shown in FIG. 1;

FIG. 4 is a perspective view of a characteristic part of the vehicle-mounted excavated soil treatment apparatus according to the present invention.

FIG. 5 is a main part side view showing another example of the vehicle-mounted excavated soil treatment apparatus according to the present invention.

FIG. 6 is a side view showing a main part of another example of the vehicle-mounted excavated soil treatment apparatus according to the present invention.

FIG. 7 is a main part side view showing another example of the vehicle-mounted excavated soil treatment apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hopper 3 Stirring device 3a Stirring arm 4 Hot air supply device 4d Hot air injection port 6 Transport device 7 Lime supply device 9 Sieve device 10 Vehicle

Claims (4)

[Claims] 1. A hopper for receiving excavated soil, a transport device for transporting the excavated soil received in the hopper toward a mixing device, and a lime for supplying lime to soil conveyed to a transport path of the transport device. A vehicle-mounted excavated soil treatment device that is mounted on a vehicle together with a supply device, wherein a hot air supply device that blows hot air toward falling soil on a fall path of the excavated soil from the hopper to the transport device. On-board type excavated soil treatment equipment provided. 2. The on-board excavated soil treatment device according to claim 1, wherein the hot air supply device utilizes heat of exhaust gas from an engine of the vehicle. 3. A stirrer having a hollow stirring arm rotating around a horizontal axis for stirring falling soil is provided in the falling path, and a hot air supply path is formed in the stirring arm. 3. The vehicle-mounted excavated soil treatment device according to claim 1, wherein a plurality of hot-air injection ports that inject hot air are formed in the stirring arm, and the stirring device is configured in the hot-air supply device. 4. 4. The vehicle-mounted excavated soil treatment apparatus according to claim 3, wherein the hot-air injection port is formed to face rearward in the rotation direction of the stirring arm.