JP5063565B2 - In-pipe filling method for electric power - Google Patents

Description

  The present invention relates to a method for filling a sheath tube for electric power in which a power tube is piped in a sheath tube buried in the ground and filling sand is filled as a filling material in a gap in the sheath tube.

In recent years, in the construction of power pipes where power lines (including power transmission lines and communication cables) are inserted and wired inside, the inside of a power sheath pipe that uses a fume pipe buried in the ground by a propulsion method as a sheath pipe Many filling methods are used.
In this filling method for the sheath tube for power, the power tube is piped in the sheath tube, and the gap in the sheath tube is filled with the filling material, and the power tube is stably fixed and supported in the sheath tube by the filling material. Therefore, it is conventionally known to use sand, cement, fly ash or the like as the filling material (see Patent Documents 1 and 2).
JP 2001-107352 A JP 2002-155527 A

However, when sand (mainly dredged sand or sea sand) is used as the filling material, the filling distance is short and it is difficult to fill with solidity, and it is necessary for people to enter narrow spaces. There was a problem that forced work was forced.

In the above-mentioned patent document, a technique is described in which stone powder is used as the filling material, and this stone powder is filled by a pneumatic feeding tube. There is no description of the structure filled with water flow, and the structure is completely different from the present invention.

The present invention has been made to solve the above-mentioned problems. By using the filling sand as the filling material, and filling the filling sand with a water stream, the labor and time are reduced. It is an object of the present invention to provide a power sheath tube filling method capable of improving the workability as described above and obtaining a sufficient filling distance and filling amount.

In order to solve the above-described problem, the method for filling a sheath tube for power of the present invention (Claim 1) is as follows.
The power pipe (2) is piped in the sheath pipe (1) buried in the ground, and the filling sand (S) is filled in the gap (12) in the sheath pipe (1) as a filling material. It is a filling method in the sheath tube for electric power,
The sheath pipe (1) is provided with a gradient, and a hook-like chute (4) is disposed in the sheath pipe (1) so as to extend from the upper end to the lower end, and water is introduced into the hook-like chute (4) from the upper end. (W) and sand for filling (S) from which foreign matter has been removed and coarse sand and fine sand have been cut off, while water (W) is drained at the lower end of the sheath pipe (1) to make the sheath pipe ( 1) The internal filling sand (S) was filled in the voids (12) in the inside.

In the present invention, “filling” not only includes filling the voids in the sheath tube in a solid and solid state without any gaps, but also filling the voids in the upper portion of the sheath tube as long as the power tube is covered. Even if there remains, the power tube can be stably fixed and supported, and the case where such a gap remains is included in the “filling” in the present invention.

In addition, the method for filling a sheath tube for power of the present invention (Claim 2) is as follows.
The method of filling a sheath tube for electric power according to claim 1 , wherein an ejector (6) is disposed at a lower end of the sheath tube (1), and water (W) is drained from the lower end of the sheath tube (1) by the ejector (6). It was set as the structure made to do.

In addition, the method for filling a sheath tube for power of the present invention (Claim 3) is as follows.
The existing filling sand (S) filled in the existing sheath pipe (1) is discharged from the lower end of the existing sheath pipe (1), and then a new power pipe (2) is constructed in the existing sheath pipe (1). pipe is allowed Rutotomoni, sheath tube (1) upper end is arranged a trough-shaped chute extended (4) to the lower end from the inside, from the top to the gutter-shaped chute (4) in the water (W), a foreign object The voids in the existing sheath pipe (1) are supplied by supplying the sand for filling (S) that has been removed and the coarse sand and fine sand have been cut, while draining water (W) at the lower end of the existing sheath pipe (1). (12) is filled with sand for filling (S).

The present invention (Claim 1) uses sand for filling as filling material, puts the sand for filling on the water flow from the upper end of the sheath tube and flows it into the sheath tube, and drains water at the lower end of the sheath tube. There is a characteristic in the structure to make.
As described above, since the filling sand is caused to flow into the gap in the sheath tube by the water flow, it is possible to improve the workability such as the reduction of construction labor and the construction time, and it is possible to obtain a sufficient filling distance and filling amount.
Further, since the water is drained at the lower end of the sheath tube, the sheath tube is not filled with water, and only the sand for filling is left in the sheath tube and can be filled in the voids in the sheath tube.
In addition, since the filling sand is filled in a wet state wet with water, an effect of dissipating heat generated in the power line is also produced.

In addition, when sand for filling is used as the filling material, since the sand has high thermal conductivity, the heat generated in the power line inserted into the power pipe can be dissipated, and heat can be prevented from being accumulated.
Unlike cement-based filling materials (foamed mortar, fly ash cement, mortar, ordinary concrete, etc.) conventionally used as filling materials, they do not generate heat during solidification.
Using sand for filling as a filling material in this way can cope with the generation of heat, so there is no trouble such as deformation of the power pipe, and in the case of cement-based filling material, the inner peripheral surface of the sheath pipe and the power pipe Although the outer peripheral surface may be damaged, there is no such damage.

As a specific method for allowing the sand for filling to flow into the sheath pipe by being put on the water stream, a hook-like chute is provided extending from the upper end to the lower end in the sheath pipe, and water is introduced into the hook-like chute from the upper end. There is a construction method in which sand for filling is flowed into a sheath pipe by supplying the sand for filling with a water flow (Claim 1) .
As a specific method for draining water from the lower end of the sheath tube, there is a construction method in which an ejector is disposed at the lower end of the sheath tube, and water is drained from the lower end of the sheath tube by this ejector (claim 2) .

By using a bowl-shaped chute in this way, the sand for filling can be put on the water flow and flow into the sheath tube from the upper end to the lower end, and by using the ejector, only water is reliably drained from the lower end of the sheath tube. Can be made.

In this case, the water flowing in the bowl-shaped chute and the filling sand overflow from the tip side of the bowl-shaped chute and are filled with the filling sand from the lower end of the sheath tube (partly, water and filling sand). Sand may overflow in the middle of the bowl-shaped chute), and thereafter the filling sand gradually fills toward the upper end of the sheath tube, so that no breathing occurs on the way and the inside of the sheath tube Can be filled smoothly over the entire length from the upper end to the lower end.

In addition, when it is necessary to change the number and type of power lines, it is necessary to replace the power pipes. At this time, if the sand for filling is used as the filling material as described above, This makes it easier to change the number of power lines in the existing sheath tube and replace the power line type.
That is, since the filling material is sand, the filling material sand can be easily discharged from the lower end of the existing sheath tube due to its fluidity.
Then, after discharging the filling material sand, install a new power pipe in the existing sheath pipe, and then put it on the water flow again from the upper end of the existing sheath pipe by the above-described power sheath pipe filling method. It is easy to replace the power pipe by letting the filling sand flow into the sheath pipe and draining water at the lower end of the existing sheath pipe to fill the gap in the existing sheath pipe with the filling sand. (Claim 3) .

FIG. 1 is an overall view showing an example of construction of the power sheath tube filling method of the present invention, FIG. 2 shows the inside of the sheath tube, a sectional view in a direction perpendicular to the pipe line, and FIG. 3 shows the inside of the sheath tube FIG. 4 is a cross-sectional view in the direction parallel to the pipe line, and FIG. 4 is a cross-sectional view in the direction parallel to the pipe line showing the lower end of the sheath pipe.

The power sheath pipe filling method of the present embodiment is such that a fume pipe is buried by a propulsion method with an upward slope (1/10 slope in the embodiment) between the start shaft 90 opened to the ground and the arrival shaft 91. A tube is used as the sheath tube 1.

As shown in FIG. 2 and FIG. 3, power pipes 2, 2 for inserting and wiring a power line (not shown) inside the sheath pipe 1 are suspended in the extending direction of the sheath pipe 1. Has been.
In this case, the power tubes 2 and 2 are suspended and supported at predetermined intervals in a state where the upper and lower surfaces of the outer circumferences are supported by the lower arm 30 and the upper arm 31 of the support frame 3 inserted into the sheath tube 1. .
In the embodiment, two power pipes 2 and 2 are provided. However, one power pipe or three or more power pipes may be used, which are suspended and supported on a support frame so that the weight balance is stable. .

Inside the sheath tube 1, the hooked chute 4 is suspended and supported by the support frame 3 above the power tubes 2 and 2 and above the center of the sheath tube 1.
The hook-like chute 4 is formed in a hook-like shape having a substantially U-shaped cross section using a metal or a synthetic resin, and is disposed in the sheath tube 1 so as to extend from the upper end to the lower end.
In this case, the bowl-like chute 4 is arranged so that its upper end extends from the upper end opening 10 of the sheath pipe 1 into the reach shaft 91 and its lower end is slightly in front of the lower end opening 11 of the sheath pipe 1. Has been.

As shown in FIG. 4, the lower end portion of the sheath tube 1 is closed at its lower end port 11 by a mortar wall 50, and an iron lid 51 for supporting the mortar wall 50 from the outside of the sheath tube 1. It is fixed to a tube port ring 52 fixed to the outer periphery of the tube 1.
The mortar wall 50 and the iron lid 51 are formed to be detachable. When the power pipe 2 is replaced, the mortar wall 50 and the iron lid 51 are removed and the filling material sand S is removed from the lower end of the existing sheath pipe 1. It can be discharged from.
In FIG. 4, what is indicated by reference numeral 92 is a retaining sheet pile of the starting shaft 90, and although not shown, a retaining sheet pile is also built in the reaching shaft 91.

The lower ends of the power pipes 2 and 2 extend through the starter shaft 90 through the mortar wall 50 and the iron lid 51.
An ejector 6 is disposed at the lower end of the sheath tube 1 through the mortar wall 50 and the iron lid 51.
This ejector 6 has a water inlet 61 fitted with a strainer 60 disposed at the bottom of the sheath pipe 1 and a drain outlet 62 disposed in the start shaft 90 to allow high-pressure air from an air compressor (not shown) to pass through the pipe. It is formed so that water is sucked from the water suction port 61 and discharged from the drain port 62 by using the negative pressure associated with the jet.
The drain port 62 is connected to a drain hose 63 for guiding the drain into the start shaft 90.
Moreover, in the embodiment, in order to prevent the filling sand from being sucked in from the water suction port 61, a ballast 64 (particle size of about 40 mm) is placed at the bottom end of the sheath tube 1 so as to cover the water suction port 61.

In the power sheath tube filling method of the present embodiment, it is mainly used as sand for filling S, as filtration sand for water and sewage (in addition, sand for casting, sand for golf courses, field sand for soccer fields, baseball fields, etc.) Special sand is used.
The product standard of this special sand (trademark “Kyuken Sand S • 110” manufactured by Nishitozaki Kosan Co., Ltd.) is shown below.
Effective diameter ... 1.10mm ± 0.05
Uniformity coefficient: 1.4 or less Maximum diameter: 2.40 mm or more and 2.0% or less 1.05 mm or less 10.0% or less Minimum diameter: 0.90 mm or less 2.0% or less density ( True specific gravity) 2.57 to 2.67
Washing turbidity: 20 ° C or less Heating raw material: 0.5% or less Hydrochloric acid solubility rate: 1.0% or less wear rate: 1.0% or less

This special sand is mainly river sand, hill sand, or blown sand, which is put into a hopper to remove foreign matters such as coarse dust, wood chips, stones and viscosity, and then the first trommel (rotary type) Coarse sand is cut using a sieving machine or the like, and then transported to a second trommel (rotary sieving machine) by Akins (rotary scouring and conveying machine) to cut fine sand. The coarse sand cut and the fine sand cut are repeated once or a plurality of times to produce special sand of a predetermined standard.
Such special sand is obtained by removing foreign substances and cutting coarse sand and fine sand, and has excellent fluidity on a water stream, and can be suitably used in the method of the present invention.

Next, as shown in FIG. 1, the filling method of the filling sand S is such that water W is supplied from the water supply truck 71 to the upper end of the bowl-like chute 4 via the supply hopper 70, and from the dump truck 72. By supplying the filling sand S, the intermediate filling sand S is caused to flow into the sheath pipe 1 from the upper end of the sheath pipe 1 and the water W is drained by the ejector 6 at the lower end of the sheath pipe 1. In this way, the filling sand S is filled into the gap 12 in the sheath tube 1.

In this case, the water W drained from the ejector 6 is stored in the start shaft 90, and the stored water W is pumped up through the pumping pipe 73 and stored in the water tank 74 on the ground. Let Then, the water supply truck 71 emptied by the water supply is moved to the position of the water tank 74, where water is replenished from the water tank 74 to the water supply truck 71 and moved again to the water supply place (reach shaft 91). Car circulation system is adopted.

As described above, the filling method in the casing for power of the embodiment is characterized in that the filling sand S is used as the filling material, and the filling sand S is filled into the gap 12 of the sheath pipe 1 by the water flow. is there.
Thereby, while being able to improve workability, such as reduction of construction labor and shortening of construction time, a sufficient fillable distance and filling amount can be obtained.

Further, when it is necessary to change the number or type of power lines, the mortar wall 50 and the iron lid 51 provided at the lower end of the existing sheath pipe 1 are removed, and the filling material sand S is removed from the existing sheath pipe 1. Drain from the lower end of the.
At this time, since the filling material is sand, the filling material sand S can be easily discharged from the lower end of the existing sheath tube 1 by its fluidity.
Then, after discharging the filling material sand S, a new power pipe 2 is installed in the existing sheath pipe 1, and then the water flow is again made from the upper end of the existing sheath pipe 1 by the above-described filling method in the power sheath pipe. A new filling sand S is put into the sheath tube 1 and water is drained at the lower end of the existing sheath tube 1 to fill the void 12 in the existing sheath tube 1 with the filling sand S. By doing so, the replacement work of the power pipe 2 can be easily performed.

Overall view showing a construction example of the method for filling a sheath tube for power of the present invention Cross-sectional view showing the inside of the sheath tube and in the direction perpendicular to the pipeline This shows the inside of the sheath pipe, and is a cross-sectional view parallel to the pipe line. Shows the lower end of the sheath tube, and is a cross-sectional view parallel to the pipeline

DESCRIPTION OF SYMBOLS 1 Sheath pipe 10 Upper end port 11 Lower end port 12 Space | gap 2 Electric power pipe 3 Support frame 30 Lower arm 31 Upper arm 4 Gutter-like chute 50 Mortar wall 51 Iron lid 52 Pipe port ring 6 Ejector 60 Strainer 61 Water intake port 62 Drain port 63 Drain hose 64 Ballast 70 Supply hopper 71 Water supply truck 72 Dump truck 73 Pumping pipe 74 Water tank 90 Starting shaft 91 Reaching shaft 92 Earth retaining sheet pile S Sand for filling W Water

Claims (3)

The power pipe (2) is piped in the sheath pipe (1) buried in the ground, and the filling sand (S) is filled in the gap (12) in the sheath pipe (1) as a filling material. It is a filling method in the sheath tube for electric power,
The sheath pipe (1) is provided with a gradient, and a hook-like chute (4) is disposed in the sheath pipe (1) so as to extend from the upper end to the lower end, and water is introduced into the hook-like chute (4) from the upper end. (W) and sand for filling (S) from which foreign matter has been removed and coarse sand and fine sand have been cut off, while water (W) is drained at the lower end of the sheath pipe (1) to make the sheath pipe ( 1) A filling method for a sheath tube for electric power in which the void (12) in the inside is filled with sand for filling (S). The method of filling a sheath tube for electric power according to claim 1, wherein an ejector (6) is disposed at a lower end of the sheath tube (1), and water (W) is drained from the lower end of the sheath tube (1) by the ejector (6). A method for filling a sheath tube for power that is allowed to occur. The existing filling sand (S) filled in the existing sheath pipe (1) is discharged from the lower end of the existing sheath pipe (1), and then a new power pipe (2) is constructed in the existing sheath pipe (1). pipe is allowed Rutotomoni, sheath tube (1) upper end is arranged a trough-shaped chute extended (4) to the lower end from the inside, from the top to the gutter-shaped chute (4) in the water (W), a foreign object The voids in the existing sheath pipe (1) are supplied by supplying the sand for filling (S) that has been removed and the coarse sand and fine sand have been cut, while draining water (W) at the lower end of the existing sheath pipe (1). (12) A filling method for a sheath tube for electric power in which filling sand (S) is filled.

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