JP7108490B2 - Sand removal device in trough using air suction nozzle and sand removal method using the device - Google Patents

Description

The present invention uses a removing device for removing sand filled around the power cable in the trough when removing the unnecessary power cable laid in the trough buried in the ground, and the device. It relates to a method for removing

Conventionally, sand is filled around a power cable laid in a trough buried in the ground. In this state, it takes a lot of labor and is extremely difficult to remove the power cable by pulling it from one side.

Therefore, the ground surface is excavated along the trough buried in the ground, the trough is exposed in the excavated trench, and the power cable is removed at the same time as the trough body. After the removal, the excavated trench was backfilled with earth and sand.

In this construction method, the above-ground part of the trough must be opened and excavated along the trough, and the excavation range is large, and the amount of excavated earth and sand is large. .

On the other hand, as shown in Patent Document 1, in a trough laid in a tunnel, a construction method was also developed in which the lid on the upper surface of the trough is opened, the sand inside the trough is first removed, and then the power cable is removed from the trough. It is

In addition, excavation is impossible when there is a building or a work on the ground above the trough buried in the ground. Therefore, a method of cutting a power cable from one end to the other end of a trough with a certain length, first extracting sand from the trough in which the power cable is buried, and then pulling out the power cable from the trough is patented. It has been developed as shown in Documents 2 and 3.

JP 2007-291692 A JP-A-2006-74939 JP 2007-274839 A

The above Patent Document 1 is a device for removing sand in a trough by suction, but it is used for a trough in a sinus tract, and the sand in the trough is sucked out by opening the lid of the trough. However, opening the trough lid is labor intensive. Furthermore, in the case of a trough directly buried in the ground, as described above, this method has the drawback of requiring excavation from the ground surface, which is extremely time-consuming.

In Patent Document 2, high-pressure water is injected from one end of a trough to break up the filling sand, and the crushed sand is flowed into the vertical shaft at the one end of the trough together with the exhaust water, and sand mixed with the water accumulated in the vertical shaft. However, in this case, a large amount of water is required, and a nozzle device that propels it while injecting high-pressure water in the trough and a device that discharges the earth and sand in the vertical shaft to the ground. is required.

In addition, Patent Document 3 discloses a method and apparatus for first ejecting water into sand in a trough to fluidize the sand, sucking the fluidized sand in the trough, and removing the sand from the trough. However, in this method and apparatus, water is sprayed onto the sand in the trough to fluidize the sand, and the fluidized sand is sucked. , a device is required to discharge the earth and sand in the shaft to the ground.

Also, when sucking sand from the end of the trough with a vacuum hose, the sand at the center of the trough is sucked, leaving the sand on both sides of the trough without being sucked, and the tip of the sand facing the suction port The so-called arch effect, in which the shape of the tip portion becomes arched due to compaction, may prevent sand from being sucked. In addition, when the adhesion of sand in the trough is high, the adhesion between the power cable and the sand, and between the inner surface of the trough and the sand increases, and there is a possibility that the suction power of the vacuum may not be able to absorb the sand.

Therefore, in order to solve the above-mentioned problems, the present invention provides a sand removing device in a trough that can reliably extract and remove sand filled in a trough with a simple device, and a sand removing method using the device. It is intended to

In the invention of claim 1, a trough in which one or more electric power cables are accommodated has a tip jig made of a frame having a slightly smaller cross-section than the cross-section of the trough above the electric power cable as the air suction nozzle, The tip jig is attached to the tip of the vacuum hose, the tip of the pushing rod is fixed to the side of the vacuum hose at the attachment point of the tip jig and the vacuum hose, and the tip jig is substantially box-shaped with an open front and a back The suction port provided in is connected to one end of the vacuum hose, the tip of the lower plate projects forward from the tip of the upper plate, and the tip of the lower plate is formed into a tip blade having a mountain shape in plan view, and the suction port A sand removing device in the trough using an air suction nozzle was provided in the front-rear direction with a guide partition dividing the inside of the tip jig into two almost in the middle.

Further, the invention of claim 2 uses the air suction nozzle of claim 1, wherein the attachment of the tip of the vacuum hose to the tip jig is mutually rotatable about the axis of the vacuum hose. It was used as a sand removal device in the trough.

Further, according to the invention of claim 3, the tip of the guide partition wall extends to the tip of the lower plate, and the upper edge of the guide partition is shaped to form an inclined upper edge from the tip of the upper plate to near the tip of the lower plate. A device for removing sand in a trough using the air suction nozzle according to claim 1 or 2, wherein:

Further, according to a fourth aspect of the invention, there is provided a tip end jig comprising a frame having a cross section slightly smaller than the vertical cross section of the trough above the power cable in the trough housing one or more power cables as the air suction nozzle. is provided, the tip jig is attached to the tip of the vacuum hose, the tip of the pushing rod is fixed to the side of the vacuum hose at the attachment point of the tip jig and the vacuum hose, and the tip jig is substantially box-shaped and has an open front Then, from the suction ports provided on the left and right sides of the back, a bifurcated tubular body with one rear end projects backward, the tubular body at the rear end and one end of the vacuum hose are connected, and the tip jig The upper plate and the lower plate are such that the tip of the lower plate protrudes forward from the tip of the upper plate, and the tip of the lower plate is formed into a tip blade that is chevron-shaped in plan view, and a tip jig is provided between the left and right suction ports The sand removing device in the trough using an air suction nozzle is provided in the front and rear direction with a laterally approximately triangular pyramidal guide partition that divides the inside of the trough into two.

Further, according to the invention of claim 5, the connection between the bifurcated tubular body protruding from the back surface of the tip jig and one end of the vacuum hose is mutually rotatable around the axis of the vacuum hose. It was a sand removal device in the trough using the air suction nozzle described in .

Further, according to the sixth aspect of the invention, the tip of the guide partition wall extends to the tip of the lower plate, and the upper edge of the guide partition is shaped to form an inclined upper edge from the tip of the upper plate to near the tip of the lower plate. A sand removal device in a trough using the air suction nozzle according to claim 4 or 5, which is

Further, the invention of claim 7 uses the sand removing device according to any one of claims 1 to 6, and uses the pushing rod from one end opening of the trough toward the sand on the power cable. Then, the tip jig is pushed into the trough, sand is broken up by the tip blade of the tip jig, sand is sucked into the suction port from both sides of the guide partition, and the sand is conveyed to the ground through the vacuum hose following the suction port. A method for removing sand in a trough using an air suction nozzle, which removes sand at least above the power cable in the trough by repeatedly pushing and pulling back the tip jig by the pushing rod from one end to the other end of the trough.

According to the inventions of claims 1 and 4, since the vertical section of the tip jig made of the frame has a vertical section close to the section above the power cable in the trough, at least the sand in the trough above the power cable is sucked. can do In addition, sand may be hardened in the trough and it may be difficult to suck it, but since a tip blade is formed at the tip of the lower plate of the tip jig, when the tip jig is pushed into the trough with a pushing rod, the tip can be removed. The blade penetrates into the sand and advances by breaking the sand. The tip jig consists of a lower plate, an upper plate, and left and right side plates. It is sucked and conveyed into the vacuum hose.

Then, the tip jig can be pushed upside down. That is, with the lower plate up and the upper plate down, the cutting edge of the lower plate can be pushed along the inside of the top plate of the trough. In that case, you can break the sand stuck to the ceiling of the trough. In addition, since a guide partition is provided in the front-rear direction of the tip jig to bisect the hollow portion, sand is sucked from both the left and right sides of the trough. Therefore, the so-called arch phenomenon in which sand in the central portion of the sand in the trough is sucked and sand on both sides remains does not occur. Therefore, the sand on both sides in the trough can be reliably removed.

According to the inventions of claims 2 and 5, since the attachment of the tip of the vacuum hose to the tip jig is rotatable with respect to the axis of the vacuum hose, the vacuum hose does not have a tendency to bend. Even with it, the tip jig can always hold a fixed position in the trough.

In particular, according to the inventions of claims 3 and 6, the tip of the guide partition extends to the tip of the lower plate, and the upper edge is inclined from the tip of the upper plate to near the tip of the lower plate. Since the shape has an upper edge, the sand is guided by the inclined upper edge of the guide partition, enters the left and right hollows separately, and is sucked by the suction port on the back of the tip jig, so the sand is removed. Together with the tip blade, the sloped upper edge of the guide wall makes it easy to collapse and strengthens the tip jig.

Further, according to the seventh aspect of the invention, since the tip blade of the tip jig provided at the tip of the push rod is pushed into the sand from one end of the trough through the push rod, the sand tends to crumble. As a result, the collapsed sand is introduced into the hollow portion surrounded by the upper plate, the lower plate and the left and right side plates of the tip jig, and the sand is sucked in the hollow portion, so that the sand is reliably sucked. By pushing the pushing rod into the trough and repeating the pulling operation from one end to the other end of the trough, the sand in the trough, especially the sand in the trough above the power cable, is reliably removed.

1 is a schematic configuration diagram of a sand removing device in a trough using an air suction nozzle according to Embodiment 1 of the present invention; FIG. FIG. 2 is a plan view of the tip jig of the sand removing device in the trough using the air suction nozzle of Embodiment 1 of the present invention; FIG. 4 is a side view of the tip jig of the sand removing device in the trough using the air suction nozzle of Embodiment 1 of the present invention; FIG. 4 is a front view of the tip jig of the sand removing device in the trough using the air suction nozzle of Embodiment 1 of the present invention; FIG. 4 is a rear view of the tip jig of the sand removing device in the trough using the air suction nozzle of Embodiment 1 of the present invention; FIG. 4 is a transverse cross-sectional view of the tip jig of the sand removing device in the trough using the air suction nozzle of Embodiment 1 of the present invention; 1 is a longitudinal sectional view of a trough using a sand removing device in a trough using an air suction nozzle according to Embodiment 1 of the present invention; FIG. FIG. 4 is an end view of the trough in a state where the sand removing device in the trough using the air suction nozzle of Embodiment 1 of the present invention is pushed into the end of the trough. FIG. 4 is a vertical cross-sectional view of the trough in which the tip jig of the sand removing device in the trough using the air suction nozzle of Embodiment 1 of the present invention is pushed into the sand; FIG. 4 is a vertical cross-sectional view of the trough in which the tip jig of the sand removing device in the trough using the air suction nozzle of Embodiment 1 of the present invention is further pushed into the sand; FIG. 4 is a vertical cross-sectional view of the trough in a state in which the end jig of the sand removal device in the trough using the air suction nozzle of Embodiment 1 of the present invention is turned upside down and pushed into the sand. FIG. 4 is a schematic configuration diagram of a device for removing sand in a trough using an air suction nozzle according to Embodiment 2 of the present invention; FIG. 10 is a plan view of a tip jig of a device for removing sand in a trough using an air suction nozzle according to Embodiment 2 of the present invention; FIG. 10 is a side view of the tip jig of the sand removing device in the trough using the air suction nozzle of Embodiment 2 of the present invention; FIG. 10 is a front view of a tip jig of a sand removing device in a trough using an air suction nozzle according to Embodiment 2 of the present invention; FIG. 10 is a rear view of the tip jig of the sand removing device in the trough using the air suction nozzle of Embodiment 2 of the present invention; FIG. 7 is a cross-sectional view of a tip jig of a sand removing device in a trough using an air suction nozzle according to Embodiment 2 of the present invention;

(Embodiment example 1)
First, a sand removing device A in a trough using an air suction nozzle according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 6. FIG.

As shown in FIG. 1, the sand remover A has a tip of a vacuum hose 2 attached to the rear of a tip jig 1 . Further, the tip of the pushing rod 3 is rotatably attached to the side of the attachment point between the tip jig 1 and the vacuum hose 2 . The rear end of the vacuum hose 2 is connected to a vacuum device (not shown) installed on the ground.

The attachment of the tip jig 1 and the vacuum hose 2 is carried out by covering a tubular body 4 protruding from the rear surface of the tip jig 1 with an outer tubular body 5 provided at the tip of the vacuum hose 2 so that they are mutually rotatable about their axes. It is connected to the. Further, the tip of the pushing rod 3 is supported by a shaft 6 provided on the side surface of the outer tubular body 5 .

The tip jig 1 has a flat box shape with an open front, which consists of a lower plate 1a, an upper plate 1b, left and right side plates 1c and a back plate 1d. The longitudinal section of the tip jig 1 has a shape slightly smaller in height and width than the section of the trough 10 above the two power cables 12 housed in the later-described trough 10 (see FIG. 8). ). A suction port 7 is provided in the center of the back plate 1d, and one end of the tubular body 4 is fixed to the outer peripheral edge of the suction port 7 in contact therewith.

Further, the tip of the lower plate 1a protrudes forward from the tip of the upper plate 1b, and the tip of the lower plate 1a is formed with a tip cutting edge 8 having a mountain shape in plan view. A guide partition wall 9 is provided in the front-rear direction at a position substantially in the middle of the suction port 7 to divide the interior of the tip jig 1 into two. The tip of the guide partition wall 9 extends to the tip of the lower plate 1a, and the upper edge thereof forms an inclined upper edge 9a from the tip of the upper plate 1b to near the tip of the lower plate 1a. .

Therefore, the vacuum device on the ground operates to suck air from the vacuum hose 2, and sand enters the tip jig 1 from the direction of the tip blade 8 of the tip jig 1 as indicated by the arrow in FIG. Due to the presence of the partition wall 9, the sand is divided into two parts, enters the hollow portion surrounded by the lower plate 1a, the upper plate 1b, the side plate 1c and the back plate 1d, and enters the vacuum hose 2 through the suction port 7.

Next, a sand removing method using the sand removing apparatus A according to Embodiment 1 of the present invention will be described with reference to FIGS. 7 to 11. FIG.

First, shafts 11 are provided at both ends of a trough 10 of a certain length, and power cables 12 are cut in each shaft 11 . If there are manholes at both ends of the trough 10 of a certain length, each manhole can be used and the vertical shaft 11 need not be provided. Also, the trough 10 is filled with sand 13 .

In this trough 10, the sand removing device A is put into the trough 10 from one shaft 11 as shown in FIG. Since two power cables 12, 12 are arranged in the lower part of this trough 10, the tip blade 8 of the tip jig 1 is placed on the sand 13 on these power cables 12, as shown in FIG. The pushing rod 3 is used to push. In some cases, one power cable 12 is housed in the trough 10 , but the tip jig 1 is pushed into the sand 13 above the power cable 12 in that case as well.

As a result, sand is crumbled by the tip blade 8 and the crumbled sand falls onto the lower plate 1 a of the tip jig 1 . Then, as shown in FIG. 10, when the tip jig 1 is further pushed by the pushing rod 3, the upper, lower, left, right, and back surfaces are guided in the hollow portion surrounded by the upper plate 1b, the lower plate 1a, the left and right side plates 1c, and the back plate 1d. Sand enters each hollow portion divided by the partition wall 9, is sucked into the vacuum hose 2 from the suction port 7, passes through the vacuum hose 2, and is discharged to the ground (not shown).

When the sand is less sucked, the tip jig 1 is once pulled back to the front of the trough 10 by the pushing rod 3, and the tip jig 1 is pushed forward again to push the tip blade 8 into the sand 13.例文帳に追加As a result, the sand 13 crumbles, moves to the top of the lower plate 1a and into the hollow portion, and is sucked from the suction port 7. - 特許庁

If sand 13 is stuck to the lower surface of the top plate in the trough 10 and does not come off, as shown in FIG. The sand 13 near the lower surface of the top plate of the trough 10 can be made to bite into the sand 13, and the sand can be scraped off and broken.

In this way, the tip jig 1 is pushed in and pulled out repeatedly by the pushing rod 3, the tip jig 1 is pushed deep into the trough 10, and the sand 13 on the power cable 12 in the trough 10 is removed. At that time, a plurality of pushing rods 3 are prepared in advance so that the tip jig 1 advances in the trough 10 and the pushing rod 3 does not stop reaching the tip of the sand 13, and is configured to be sequentially connected to the rear end portion of the pushing rod 3. It's becoming Further, the push-in of the tip jig 1 by the push-in rod 3 may be done manually by an operator or by the power of a machine or the like.

In this way the sand 13 in the trough 10 or at least the sand 13 on the power cable 12 is removed. As a result, the power cable 12 can be easily stripped from one shaft 11 .

(Embodiment example 2)
Next, a sand removing device B in a trough using an air suction nozzle according to Embodiment 2 of the present invention will be described with reference to FIGS. 12 to 17. FIG.

As shown in FIG. 12, the sand remover B has the tip of a vacuum hose 16 attached to the rear of the tip jig 15 . Further, the tip of the pushing rod 17 is rotatably attached to the side of the attachment point between the tip jig 15 and the vacuum hose 16 . The rear end of the vacuum hose 16 is connected to a vacuum device (not shown) installed on the ground.

The tip jig 15 and the vacuum hose 16 are attached to a bifurcated tubular body 18 that protrudes from the back of the tip jig 15 and the rear ends of which are united, and to the tip of the vacuum hose 16. The provided outer tubular body 19 is crowned and connected to each other so as to be rotatable about an axis. Further, the tip of the pushing rod 17 is supported by a shaft 20 provided on the side surface of the outer tubular body 19 .

The tip jig 15 has a flat box shape with an open front, which consists of a lower plate 15a, an upper plate 15b, left and right side plates 15c, and a back plate 15d. Similar to the tip jig 1 of the sand removing apparatus A, the longitudinal section of the tip jig 15 is higher and wider than the cross section of the trough 10 above the two power cables 12 stored in the trough 10. has a slightly smaller shape. Suction ports 21 are provided on the left and right sides of the back plate 15d, respectively, and one end of each of the bifurcated branch pipes of the bifurcated tubular body 18 abuts on the outer peripheral edge of each suction port 21 and is fixed.

Further, the tip of the lower plate 15a protrudes forward from the tip of the upper plate 15b, and the tip of the lower plate 15a is formed with a tip cutting edge 22 having a mountain shape in plan view. Between the left and right suction ports 21 , 21 , a guide partition 23 in the shape of a horizontal triangular pyramid that divides the interior of the tip jig 1 into two is provided in the front-rear direction. The tip of the guide partition wall 23 extends to the tip of the lower plate 15a, and the upper edge of the guide partition wall 23 forms an inclined upper edge 23a from the tip of the upper plate 15b to near the tip of the lower plate 15a. .

Therefore, the vacuum device is activated and air is sucked into the vacuum hose 16, and sand enters the tip jig 15 from the direction of the tip blade 22 of the tip jig 15 as indicated by the arrow shown in FIG. , the sand is divided into two parts, enters the hollow portion surrounded by the lower plate 15a, the upper plate 15b, the side plate 15c and the back plate 15d, and enters the vacuum hose 16 through the suction port 21.

Since the method of using the sand removing apparatus B of the second embodiment is the same as that of the sand removing apparatus A of the first embodiment, the explanation is omitted.

According to the method of removing the sand 13 in the trough 10 using the sand removers A and B of the first and second embodiments described above, the cross section of the tip jig 1 or 15 is slightly wider than the left and right cross-sectional widths of the trough 10. Since it has a small width and a height close to the height of the trough cross-section above the power cable, and has a tip edge 8 or 22 and a guide partition 9 or 23 on the tip jig 1 or 15, the tip jig It is easy to push 1 or 15 into the sand 13, and the sand 13 is easy to crumble. Therefore, the sand 13 is easily sucked up and removed by suction.

Furthermore, since the sand 13 is sucked from both the left and right sides in front of the tip jig 1 or 15, the sand 13 above the cable 12 of the trough 10 can be reliably removed, and the tips of the sand are clamped together as in the conventional art. The sand 13 in the trough can be reliably removed without causing an arch phenomenon.

A sand removing device B sand removing device 1 tip jig 1a lower plate 1b upper plate 1c side plate 1d back plate 2 vacuum hose 3 pushing rod 4 tubular body 5 outer tubular body 6 shaft 7 suction port 8 tip blade 9 guide partition wall 9a inclined upper edge 10 trough 11 shaft
12 power cable 13 sand
15 tip jig 15a lower plate 15b upper plate 15c side plate 15d back plate 16 vacuum hose 17 pushing rod 18 bifurcated tubular body 19 outer tubular body 20 shaft 21 suction port 22 tip blade 23 guide partition wall 23a inclined upper edge

Claims (7)

As an air suction nozzle, a tip jig made of a frame having a cross section slightly smaller than the cross section of the trough above the power cable is provided in a trough containing one or more power cables, and the tip jig is attached to the vacuum hose. attached to the tip of
Fix the tip of the pushing rod on the side of the vacuum hose at the attachment point of the tip jig and the vacuum hose,
The tip jig has a substantially box shape with an open front, a suction port provided on the back is connected to one end of the vacuum hose, the tip of the lower plate protrudes forward from the tip of the upper plate, and the tip of the lower plate The tip is formed into a tip blade that is chevron-shaped in plan view,
An apparatus for removing sand in a trough using an air suction nozzle, characterized in that a guide partition dividing the interior of the tip jig into two is provided in the front-rear direction at approximately the center of the suction port. The attachment of the tip of the vacuum hose to the tip jig is rotatable with respect to the axis of the vacuum hose. Sand remover. The tip of the guide partition extends to the tip of the lower plate, and the upper edge of the guide partition is shaped to form an inclined upper edge from the tip of the upper plate to near the tip of the lower plate. 3. A device for removing sand in a trough using the air suction nozzle according to claim 1 or 2. As an air suction nozzle, a tip jig made of a frame having a cross section slightly smaller than the cross section of the trough above the power cable is provided in a trough containing one or more power cables, and the tip jig is attached to the vacuum hose. attached to the tip of
Fix the tip of the pushing rod on the side of the vacuum hose at the attachment point of the tip jig and the vacuum hose,
The tip jig has a substantially box-like shape and has an open front surface. From suction ports provided on the left and right sides of the back surface, a bifurcated tubular body with a single rear end protrudes rearward. One end of the vacuum hose is connected to the upper plate and the lower plate of the tip jig, the tip of the lower plate protrudes forward from the tip of the upper plate, and the tip of the lower plate is formed into a tip blade that is chevron-shaped in plan view. is,
Sand removal in the trough using an air suction nozzle, characterized in that a horizontal substantially triangular pyramid-shaped guide partition dividing the inside of the tip jig into two is provided in the front-rear direction between the left and right suction ports. Device. 5. The air according to claim 4, wherein the connection between the bifurcated tubular body protruding from the back surface of the tip jig and one end of the vacuum hose is mutually rotatable about the axis of the vacuum hose. Sand remover in trough with suction nozzle. The tip of the guide partition extends to the tip of the lower plate, and the upper edge of the guide partition is shaped to form an inclined upper edge from the tip of the upper plate to near the tip of the lower plate. A device for removing sand in a trough using the air suction nozzle according to claim 4 or 5. Using the sand removing device according to any one of claims 1 to 6, push the tip jig into the trough from one end opening of the trough toward the sand above the power cable using the pushing rod. ,
Sand is crushed by the tip blade of the tip jig, sand is sucked into the suction port from both sides of the guide partition and taken in, and the sand is conveyed to the ground through the vacuum hose leading to the suction port,
A method for removing sand in a trough using an air suction nozzle, characterized in that the pushing rod is repeatedly pushed and pulled back from one end of the trough to the other end to remove sand at least above the power cable in the trough.

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