JP2001149445A - Steam soil sterilizing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steam soil sterilization method by which soil can be sterilized efficiently and cheaply. SOLUTION: A steam discharging pipe 7 is buried in the ground, and then steam is discharged from the pipe 7 with the pipe 7 stayed in the ground. Upon completing steam discharge, the pipe 7 is retrieved from the ground.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a steam soil disinfection method for disinfecting soil with steam.

[0002]

BACKGROUND OF THE INVENTION When cultivated soil is disinfected, it is possible to cultivate cultivation advantageously, for example, by killing diseased bacteria and various germs and continuously cropping. Disinfection by steam can be performed while avoiding adverse effects on the global environment as in the case of disinfection by methyl bromide. When the steam discharge tube is placed on the soil surface and the steam is supplied from the surface of the soil to disinfect it, the steam and its heat are easily leaked out of the soil or hardly transmitted to the soil. For this reason,
There has been a method in which a steam discharge pipe is buried in the soil to release steam from the inside of the soil, so that steam and heat are hardly leaked out of the soil and disinfected while being easily transmitted to the inside of the soil.

[0003]

In the conventional disinfection method for discharging steam from the soil, the steam discharge pipe is left in the soil even after the disinfection is completed, and the steam discharge pipe is not used. It is dedicated to the cultivation site in which it is buried, and disinfection of the soil is not performed frequently, and the cost is high because the frequency of use of the steam discharge pipe is low. In particular,
If the cultivation area is large or the cultivation area is in many places and the area that needs to be disinfected becomes large, the number and length of steam discharge pipes will be required, and the cost will increase significantly. Was.

For example, as shown in Japanese Patent Publication No. 50-33941, a steam discharge pipe is moved in the soil and is not left in the soil. In this case, the movement of the steam discharge pipe is restricted. A configuration for moving and guiding rails and wheels is required so that it becomes possible and easy, and that the moving direction is fixed and disinfection does not leak easily.
The cost was high. Further, it is necessary to make the steam discharge pipe relatively short so as to be movable, and it takes time to supply steam to a large area of soil. An object of the present invention is to provide a method for disinfecting steam soil that can disinfect by making it possible to disinfect it by making it difficult for steam and heat to leak out of the soil and to be easily transmitted to the inside of the soil.

[0005]

The constitution, operation and effect of the invention according to claim 1 are as follows.

[Structure] After the steam discharge pipe is buried in the soil,
A steam soil disinfection method in which disinfecting steam is discharged from the steam discharge tube into the soil while the steam discharge tube is stationary in the soil, and when the steam release is completed, the steam discharge tube is recovered from the soil.

[Action] While the steam discharge pipe buried in the soil is stationary in the soil, the disinfecting steam is released from the steam discharge pipe, and the steam discharge pipe can be moved as in the case of moving the steam discharge pipe. While eliminating the need for moving and guiding components such as moving wheels, and positioning the steam discharge pipe over a wider range than when moving the steam discharge pipe so that the steam is released at once over a wide range, Is supplied to the soil from the inside. When the steam release is completed, the steam release pipe can be recovered from the soil and transported to the next ridge where disinfection has been completed, or to a disinfection site different from the site where disinfection has been completed, and used for disinfecting the soil. It is.

[Effect] The steam is released from the inside of the soil to make it difficult for the steam and its heat to leak out of the soil and to be easily transmitted to the inside of the soil. In addition, the steam is released while the steam discharge pipe is stopped in the soil. Thus, even in the case of a wide range of soil, steam can be supplied to the soil at a time, and the disinfection work can be efficiently performed with a high disinfection effect. In addition, the steam discharge pipes are collected and used for disinfection of soil at different sites, and furthermore, the moving and guiding structures necessary for moving the steam discharge pipes in the soil to release steam are provided. It can be made unnecessary and inexpensive.

The structure, operation and effect of the invention according to claim 2 are as follows.

[Structure] In the structure according to the first aspect of the present invention, a flexible steam discharge tube is used as the steam discharge tube.

[Effects] Even when a large steam discharge tube is required in terms of length and quantity, it can be wound around a winding drum or wound up in a coil and transported to a disinfection work site. Also, at the work site, the take-up drum can be pulled out of the soil by rotating the take-up drum, unwinding the coil so that it can be continuously fed out into the soil, or by driving the take-up drum to perform the take-up action. I can collect it.

[Effect] The steam discharge tube can be wound around a take-up drum, wound up in a coil shape and housed compactly, and can be easily handled and transported easily. Further, the steam discharge pipe can be smoothly and easily installed in the soil or recovered from the soil simply by rotating the winding drum or releasing the coil winding.

The structure, operation and effect of the invention according to claim 3 are as follows.

[Structure] In the structure according to the second aspect of the present invention, a groove excavation portion that forms a groove in the ground as the traveling body travels, and a steam discharge pipe is wound around the groove formed by the groove excavation portion. A working machine provided on the traveling machine body is provided with a pipe supply unit that feeds out and supplies from the take-up drum and a groove filling unit that fills a groove after the pipe supply unit supplies a steam discharge pipe. When the pipe is buried in the soil, the working machine is used.

[Operation] The traveling body is run, a groove is formed in the ground by a groove excavation part, a steam discharge pipe is supplied to the groove by the pipe supply part, and the steam discharge pipe is filled by the groove filling part. It goes.

[Effect] The steam discharge pipe can be easily and quickly buried simply by moving the traveling body, and the disinfection work can be performed easily and efficiently from the viewpoint of the work of burying the steam discharge pipe.

The structure, operation and effect of the invention according to claim 4 are as follows.

[Structure] In the structure of the invention according to the third aspect, the winding drum of the working machine is configured to be driven to a winding side of a steam discharge pipe, and the steam discharge pipe is collected. When using the work machine.

[Operation] The running machine is driven while the winding drum is driven to the winding side, and the steam discharge pipe is pulled up from the soil by the driven winding drum to be wound and collected.

[Effect] It is possible to easily and quickly recover the steam discharge pipe from the soil simply by running the traveling machine body, and it is possible to easily and efficiently disinfect the steam discharge pipe from the viewpoint of collecting the steam discharge pipe. Moreover, despite the fact that the steam discharge pipe is buried with a work machine,
It can be inexpensive using the same working machine as for burial.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a pair of left and right steerable front wheels 1, 1, a pair of right and left rear wheels 2, 2, and an engine 3 located above a front axle are shown in FIG. A groove excavation unit 10 having an endless rotary type excavation chain 11 at the rear of a self-propelled body having a driving unit having a steering handle, a driver's seat, and the like located behind the driving unit. A pipe supply section 20 having a winding drum 21 located slightly behind the groove excavation section 10;
0 and a groove filling portion 30 having a porcelain plate 31 located slightly behind, and configured to transmit power from the transmission case 4 forming the rear portion of the self-propelled body to the groove excavation portion 10, It constitutes a riding-type pipe burying and pipe collection work machine. This work machine is used when disinfecting soil such as a vegetable cultivation house with steam, and is configured in detail as follows.

The groove excavation part 10 includes an excavation part frame 12 having a front end connected to a rear part of the transmission case 4 of the self-propelled body via a link mechanism 5 which can be vertically swung by a hydraulic lift cylinder. This excavation part frame 1
The excavating chain 11 is mounted over a plurality of sprockets 13 supported by the excavator 2, and an auger 14 is supported by the excavating portion frame 12 so as to be rotatable around a horizontal axis of the machine body. One of the plurality of chain sprockets 13 and the auger 14
Is configured to drive the excavation chain 11 and the auger 14 by being driven by being transmitted with power from a power take-out shaft provided at the rear of the transmission case 4 of the self-propelled body. is there.

That is, by operating the lift cylinder to swing the link mechanism 5 up and down with respect to the self-propelled body, the excavating unit frame 12 swings up and down with respect to the self-propelled body, and May rise from the ground and the trench excavation unit 10 may be in a non-working state, or the rear end side of the excavation chain 11 may be in contact with the trench excavation unit 10 in a working state. When the traveling machine is caused to travel while the groove excavation unit 10 is in the working state, the driven excavation chain 11 excavates the ground by using excavation claws provided at a plurality of locations in the longitudinal direction of the excavation chain 11. The auger 14 sends out the soil scraped above the groove 6 onto the ground laterally outside the groove 6.

The pipe supply section 20 has a supply section frame 22 extending from the excavation section frame 12 of the trench excavation section 10 so as to be swingable up and down rearward, and the supply section frame 22 is rotatable. The winding drum 21 to be supported
A drum motor 23 that is linked to a rotation support shaft of the winding drum 21; and a plurality of guide wheels 24 rotatably supported by the supply unit frame 22 below the winding drum 21. 25. The drum motor 23 is driven by the hydraulic pressure supplied from the self-propelled body to drive the rotation shaft of the winding drum 21, thereby driving the winding drum 21 to the winding side of the steam discharge pipe 7.

That is, the winding drum 21 is configured to wind and house the flexible vapor discharge tube 7. The winding of the pipe supply unit 20 is stopped by the rotation of the winding drum 21 and the drum motor 23 so that the winding drum 21 rotates freely, and the guide wheel 25 located at the lowest level is formed by the groove formed by the groove excavation unit 10. 6 and the self-propelled body is caused to travel. At this time, the tip side of the steam discharge pipe 7 fed out from the winding drum 21 is fixed to a pile provided at the end of the cultivation area, or is fixed by being buried in a groove previously provided at a work starting point of the ridge 8. Keep it. Then, as shown in FIG. 1, tension is generated in the steam discharge pipe 7 due to the movement of the traveling body, and the winding drum 21 rotates to draw out the steam discharge pipe 7 due to the tension, and the guide wheel The body 25 is a tube 7 for discharging steam from the winding drum 21.
Is guided to the bottom of the groove 6 and supplied. As a result, the pipe supply unit 20 moves the groove excavation unit 1 as the traveling body travels.
0 is wound around the groove 6 formed by the steam discharge pipe 7
And supply.

As shown in FIG. 4, the bottom of the groove excavation section 10 is moved downward so that the excavation chain 11 descends to near the upper part of the steam discharge pipe 7 in the soil and does not damage the steam discharge pipe 7. A groove 9 having a depth of up to 7 is formed above the vapor discharge pipe 7 in a descending operation state. And the pipe supply unit 20 is
The take-up drum 21 is driven to the take-up side by the drum motor 23, and the traveling body is moved in a working state in which the guide wheel body 25 of the lowest level is located inside the groove 9 formed by the groove excavation part 10. . Then, the winding drum 21 is driven by the drum motor 23, and the steam discharge pipe 7 is pulled up from the soil below the groove 9 and wound by the winding force exerted by the drum motor 23. Thereby, the pipe supply unit 20 collects the steam discharge pipe 7 from the soil by the winding force of the winding drum 21 as the traveling body travels.

The groove filling portion 30 is constructed by supporting the earthing plate 31 at the rear end of the supply section frame 22 of the pipe supply section 20. The earth approaching plate 31 is pulled by the traveling machine body, so that the soil left by the groove excavation unit 10 on the lateral outer side of the groove 6 is brought down to the inside of the groove 6 behind the pipe supply unit 20 and dropped. As a result, the groove filling unit 30 fills the groove 6 after the pipe supply unit 20 supplies the steam discharge pipe 7 and buries the steam discharge pipe 7 in the soil as the traveling body travels.

Next, a description will be given of a steam soil disinfection method for disinfecting soil with steam.

As shown in FIG. 2, the working machine is run along the ridge 8 from one end of the cultivation area to the other end, and the groove excavating section 10, the pipe supplying section 20, and the groove filling section 30 of the working machine are operated. With this operation, the steam discharge pipe 7 is buried in the ridge 8 at a depth of about 50 cm. When the steam discharge pipe 7 is buried to the end of the ridge 8, the work machine is turned to travel along the ridge 8 adjacent to the ridge 8 in which the steam discharge pipe 7 has been previously buried, in a direction opposite to the previous running direction. Then, the steam discharge pipe 7 is embedded in the ridge 8. in this way,
The work machine is reciprocated to bury the steam discharge pipes 7 in all the ridges 8 to be disinfected. When the winding drum 21 is emptied by consuming all of the steam discharge pipes 7 of the winding drum 21 during the embedding work, the empty winding drum 21 is emptied.
Is removed from the pipe supply section 20 and a new winding drum 21 containing the steam discharge pipe 7 is replaced with an empty winding drum 2.
1 and attached to the pipe supply unit 20, and at the same time, the end of the steam discharge pipe 7 drawn from the new winding drum 21 is connected to the end of the steam discharge pipe 7 already embedded in the ridge 8. , Resume burial work.

When the steam discharge pipes 7 have been buried in all the ridges 8 to be disinfected, as shown in FIG. 3, a plug member 40 is attached to one end of the steam discharge pipes 7 so that the steam flows through the openings. Close so that it does not leak. The other end is connected to a boiler device 42 by a steam supply hose 41 and this boiler device 4
By supplying the high-pressure disinfecting steam of 2 to 100 to 120 ° C. to the steam discharge pipe 7, the steam discharge pipe 7 is stopped as shown in FIGS.
The steam is discharged into the soil from the discharge holes 7a arranged in the longitudinal direction and the circumferential direction of the soil, and the soil is heated by the steam. At this time, the discharge pipe portion 7b which is bent in a U-shape between two adjacent ridges 8 is provided with a plug means such as covering soil. Then, it becomes difficult for the steam to leak out from the steam discharge hole 7a present in the discharge pipe portion 7b, and the steam easily reaches the steam discharge pipe 7 in the ridge. Furthermore, at this time, ridge 8
When the top is covered with a heat insulating sheet made of resin or the like, it is difficult for heat to escape from the soil surface, and heating can be performed efficiently.

When the temperature of the soil rises to a predetermined sterilization temperature, the supply of steam to the steam discharge pipe 7 is stopped, and the release of steam from the steam discharge pipe 7 is stopped. When the disinfection is completed after a lapse of a predetermined time from the temperature increase, the working machine is set to the working state of the pipe collection and travels along each ridge 8 as shown in FIG.
That is, the groove excavation unit 10 is in a working state in which the groove 9 having a depth up to the bottom reaches the steam discharge pipe 7 is formed above the steam discharge pipe 7, and the pipe supply unit 20 is wound up by the winding drum 21. The vehicle is driven in a collecting state driven by the drum motor 23. That is, the work equipment for burying pipes is used as a pipe collection machine, and the steam discharge pipes 7 are taken out from the soil of each ridge 8 and collected.

[Another Embodiment] When a flexible discharge tube is used as the vapor discharge tube 7 as in the above-described embodiment, the embedding and recovery thereof can be performed easily by using the winding drum 21, which is advantageous. However, in order to carry out the invention according to the first aspect, it is necessary to form a plurality of straight pipe sections having no flexibility and to connect the ends of the pipe sections with each other in a direction perpendicular to the axis of the pipe section. The present invention may be implemented by adopting a bendable and stretchable tube including a joint connected so as to rotate relatively around the core. Also in this case, the steam discharge pipe can be continuously laid out and buried in the trench, or can be continuously pulled up from the soil and collected.
The object of the present invention can be achieved.

[Brief description of the drawings]

FIG. 1 is a side view of an entire working machine in a state where pipes are buried.

FIG. 2 is an explanatory view of a steam soil disinfection method.

FIG. 3 is an explanatory diagram of a steam soil disinfection method.

FIG. 4 is a side view of the working machine in a state where pipes are collected.

FIG. 5 is a side view of a steam discharge tube.

FIG. 6 is a sectional view of a steam discharge tube.

[Description of Signs] 6 groove 7 steam discharge pipe 10 groove excavation part 20 pipe supply part 21 winding drum 30 groove filling part

Claims (4)

[Claims] After burying the steam discharge pipe in the soil, disinfecting steam is discharged from the steam discharge pipe into the soil while the steam discharge pipe is kept still in the soil. Steam soil disinfection method to recover from soil. 2. The steam soil disinfection method according to claim 1, wherein a flexible steam discharge pipe is used as the steam discharge pipe. 3. A groove excavation part for forming a groove in the ground as the traveling body travels, a pipe supply part for feeding a steam discharge pipe from a winding drum and supplying the groove to the groove formed by the groove excavation part. A working machine provided with the traveling body with a groove filling portion for filling the groove after the pipe supply section supplies the steam discharging pipe is prepared, and when the steam discharging pipe is buried in the soil, the working machine is used. The method for disinfecting steam soil according to claim 2, wherein 4. The work machine according to claim 3, wherein the winding drum of the work machine is configured to be driven to a winding side of a steam discharge pipe, and the work machine is used when collecting the steam discharge pipe. Steam soil disinfection method.