JP2006336382A - Method for erecting utility pole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for erecting a utility pole which prevents ground subsidence due to defective backfilling. <P>SOLUTION: The utility pole 1 is erected in a hole 4 excavated in the ground 3 and an embedded member 2 which is preliminarily formed is inserted and embedded between a side wall of the hole 4 and the utility pole 1. A solidified part 6 is formed by injecting a soil improver between the embedded member 2 and a surface of the hole 4. A ground electrode 5 is preliminarily embedded in the solidified part 6 and is electrically connected with the utility pole 1. Backfilling earth and sand 7 is placed on the embedded member 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a utility pole construction method, and more particularly to a utility pole construction method in which a utility pole is inserted and buried in a hole excavated in the ground.

  To build a utility pole, it is necessary to dig a hole in the ground with a diameter larger than that of the utility pole. In the case of normal earth and sand ground, drill holes using auger rods with spiral wings around the axis of rotation. If the ground is rock, drill a small diameter pilot hole with a rock drill and rock bit. Then, using a counterbore tool provided with a rod-shaped guide member protruding forward at the center and provided with a plurality of cutter bits around the guide member, the guide member is fitted into the pilot hole. In this state, a rotating counterboring device is used to apply rotation and thrust to form a smooth counterbore on the peripheral edge of the opening of the pilot hole. Next, a hard blade is provided at the opening edge of the cup concession carrier. Using a ring-shaped drilling tool provided with a rod-shaped guide member protruding forward at the core, rotation and thrust are applied by a rotary drilling device in a state where the guide member is fitted in the pilot hole. By forming an annular cut centered on the pilot hole in the counterbore surface, After, by crushing the inner portion than the notch, there is known a method of the desired construction pillar holes (e.g., see Patent Document 1).

After digging a hole, the electric pole is inserted into the hole, and so-called backfilling is performed by inserting excavated earth and sand between the electric pole and the inner surface of the hole, and the electric pole is fixed by pressing the earth and sand from above.
JP-A-8-135355

  However, excavated earth and sand may have a lot of sand or a lot of pebbles. In such a case, the utility pole may wobble or the backfill portion may sink after the backfill. When building a utility pole by excavating the normal ground, the amount of sediment used for backfilling is less than the volume of the sediment that has been excavated by the volume of the utility pole buried in the ground. Although it can be used for backfilling, if the existing utility pole is rebuilt for some reason, all of the excavated earth and sand is used for backfilling, and sinking is likely to occur.

  In addition, when excavating an existing utility pole and filling a new utility pole, there is also a problem that it is difficult to dig out the utility pole because the existing utility pole becomes an obstacle.

  This invention is made | formed in view of this point, The place made into the objective is to provide the utility pole construction method which prevents the depression of the ground by backfilling failure.

  The first utility pole construction method of the present invention is a utility pole construction method in which a power pole is inserted and buried in a hole excavated in the ground, the step of inserting the power pole into the hole, and a gap between the surface of the hole and the power pole Inserting a preformed embedded member into the hole, and injecting a soil conditioner between the surface of the hole and the embedded member. The soil conditioner is a solidifying agent that hardens the ground and prevents the holes from collapsing. The embedded member formed in advance is preferably formed in a shape that fills the gap between the hole surface and the utility pole, and may be divided into a plurality of portions.

  The second utility pole construction method of the present invention is a utility pole construction method in which a power pole is inserted and buried in a hole excavated in the ground, the step of attaching an embedded member formed in advance under the power pole, and the embedded member is attached. A step of inserting the electric pole portion into the hole, and a step of injecting a soil conditioner between the surface of the hole and the embedded member. Note that the lower part of the utility pole is the part that falls below when the utility pole is built.

  The third utility pole construction method of the present invention is a utility pole construction method in which a utility pole is inserted and buried in a hole excavated in the ground, the step of inserting a cylinder having an inner diameter larger than the diameter of the utility pole into the hole, and the cylinder A step of inserting the electric pole inside, and a step of inserting an embedded member formed in advance in a gap between the inner surface of the cylinder and the electric pole.

  A fourth utility pole construction method of the present invention is a utility pole construction method in which a utility pole is inserted and buried in a hole excavated in the ground, the step of inserting a cylinder having an inner diameter larger than the diameter of the utility pole into the hole, and a lower part of the utility pole And a step of attaching a previously formed embedded member and a step of inserting the portion of the electric pole to which the embedded member is attached into the cylinder.

  The utility pole construction method of the present invention prevents the hole from collapsing with the soil conditioner or the cylinder, supports the utility pole with the embedded member, and the embedded member serves as a substitute for the backfill soil.

  It is preferable that the upper end of the embedded member is installed below the ground, and further includes a step of placing earth and sand on the upper end of the embedded member.

  In a preferred embodiment, a ground electrode is installed on the earth and sand into which the soil condition improving agent has been injected.

  In a preferred embodiment, the step of inserting the tube is performed while excavating the hole.

  In a preferred embodiment, at least a part of the surface of the cylinder is made of a conductive member. Furthermore, it is preferable that the conductive member and the utility pole are electrically connected.

  The embedding member is preferably made of plastic, rubber or wood.

  When the electric pole is built in the hole excavated in the ground, the space between the electric pole and the inner surface of the hole is embedded with an embedding member made of plastic, so that the embedding member reliably supports the electric pole and prevents collapse of the accumulated soil.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following drawings, components having substantially the same function are denoted by the same reference numerals for the sake of brevity. In addition, the following embodiment is an illustration and this invention is not limited to these examples.

(Embodiment 1)
FIG. 1 shows a vertical sectional view of a utility pole constructed by the utility pole construction method of Embodiment 1 and its peripheral portion. In this embodiment, the utility pole 1 is built in the hole 4 dug in the ground 3. The hole 4 has a diameter about 1.5 to 2 times that of the utility pole 1. The space between the inner surface of the hole 4 and the utility pole 1 is embedded with an embedding member 2 made of polystyrene foam. A backfill earth and sand 7 is placed on the embedding member 2. The space between the inner surface of the hole 4 and the utility pole 1 is embedded by the embedded member 2 with almost no gap, except for the space for placing the backfill earth and sand 7. In the ground portion in the vicinity of the side wall surface of the hole 4, there is a solidified portion 6 in which a soil conditioner is injected. A ground electrode 5 is embedded in a part of the solidified portion 6, and the ground electrode 5 is electrically connected to the utility pole 1.

  Next, the utility pole construction method according to the present embodiment will be described with reference to FIGS.

  First, as shown in FIG. 2A, a hole 4 having a circular cross section is dug in the ground 3. The hole 4 is excavated using an auger rod or the like. Of the earth and sand excavated during the excavation, high-quality earth and sand that does not sink even if it is backfilled is stored for the backfill earth and sand 7.

  Then, as shown in FIG. 2B, a ground electrode 5 is embedded near the surface of the hole 4. Then, the electric pole 1 is inserted into the hole 4.

  Next, as shown in FIG. 2C, the embedded member 2 is inserted and embedded in the space between the utility pole 1 and the hole 4 side wall surface. Further, a soil conditioner is injected between the embedding member 2 and the surface of the side wall of the hole 4. That is, the soil improver is injected from the surface of the side wall of the hole 4 in contact with the embedding member 2 into the ground 3. As a result, the earth and sand surrounding the embedded member 2 is solidified to form a solidified portion 6. FIG. 3 shows this state viewed from above. The embedding member 2 is divided into a sector when viewed from above so that it can be easily inserted. The embedded member 2 is entirely buried in the hole 4 and does not protrude above the ground.

  Finally, as shown in FIG. 2D, the backfill earth and sand 7 is placed on the embedding member 2 and the construction is completed.

  The utility pole construction method according to this embodiment has the following effects.

  Since the space between the side wall of the hole 4 and the utility pole 1 is almost filled with the burying member 2, no depression due to poor backfilling occurs. Moreover, since the embedding member 2 is made of expanded polystyrene, it is lightweight and easy to construct, and the construction efficiency increases.

  Since the soil condition improver is injected in the vicinity of the surface of the side wall of the hole 4, the hole 4 does not collapse even if the utility pole 1 is removed in the future, and the rebuilding work can be easily performed. When the utility pole 1 is pulled out, it can be easily pulled out together with the embedding member 2 or by crushing the embedding member 2 so that it is not necessary to dig. Further, since the ground electrode 5 is embedded in the solidified portion 6 into which the soil condition improving agent has been injected, the ground resistance is lowered by the soil condition improving agent, and the grounding can be reliably performed.

  Note that the soil conditioner may be injected into the ground before the embedded member 2 is inserted.

(Embodiment 2)
The utility pole construction method according to the second embodiment is the same as the first embodiment except that a part of the method is different from that of the first embodiment.

  The utility pole construction method according to the present embodiment is different from that of the first embodiment in that the utility pole 1 and the embedded member 2 are simultaneously placed in the hole 4. That is, as shown in FIG. 4, in this embodiment, the embedded member 2 is attached in advance to the lower part of the utility pole 1, and this is inserted into the hole 4 as it is. The attachment member 2 may be attached to the utility pole 1 by any method such as adhesion, fitting, and binding. The installation of the ground electrode 5 and the injection of the soil conditioner are the same as in the first embodiment.

  The utility pole construction method according to the present embodiment has the following effects in addition to the effects of the first embodiment.

  Since the step of attaching the embedded member 2 to the lower portion of the utility pole 1 is performed separately and the utility pole 1 with the embedded member 2 is inserted into the hole 4, the construction of constructing the utility pole 1 can be performed in a short time. In particular, if the embedded member 2 is attached to the lower part of the utility pole 1 in advance in a factory or the like, the construction time at the site where the utility pole 1 is built can be further shortened, and the construction cost can be reduced.

(Embodiment 3)
FIG. 5 shows a vertical cross-sectional view of the utility pole constructed by the utility pole construction method according to the third embodiment and its peripheral portion. In this embodiment, like the first embodiment, the utility pole 1 is built in the hole 4 dug in the ground 3. The hole 4 has a diameter about 1.5 to 2 times that of the utility pole 1. A metal cylinder 11 is inserted into the hole 4. The outer diameter of the cylinder 11 is substantially the same as or slightly smaller than the diameter of the hole 4. The inner diameter of the cylinder 11 is about 2 to 3 times the diameter of the utility pole 1. An embedded member 2 made of expanded polystyrene is embedded in the space between the inner surface of the cylinder 11 and the utility pole 1. A backfill earth and sand 7 is placed on the embedding member 2. The embedded member 2 is embedded in the space between the inner surface of the cylinder 11 and the utility pole 1 with almost no gap, except for the space on which the backfill earth and sand 7 is placed. The cylinder 11 also functions as a ground electrode and is electrically connected to the utility pole 1.

  Next, the utility pole construction method according to this embodiment will be described with reference to FIGS.

  First, as shown in FIG. 6A, a hole 4 having a circular cross section is dug in the ground 3. The hole 4 is excavated using an auger rod or the like. Of the earth and sand excavated during the excavation, high-quality earth and sand that does not sink even if it is backfilled is stored for the backfill earth and sand 7.

  Then, as shown in FIG. 6B, the cylinder 11 is inserted into the hole 4. Since the outer diameter of the cylinder 11 is set to be substantially the same as or slightly smaller than the diameter of the hole 4, the cylinder 11 can be easily inserted into the hole 4.

  Next, as shown in FIG. 6C, the utility pole 1 is inserted into the cylinder 11. The cylinder 11 and the utility pole 1 are electrically connected.

  Thereafter, as shown in FIG. 6 (d), the embedded member 2 is inserted into the space between the inner surface of the cylinder 11 and the utility pole 1. The size of the embedded member 2 is set in advance so that the upper end of the embedded member 2 is located below the ground surface.

  Then, as shown in FIG. 6 (e), the backfill earth and sand 7 is placed on the embedding member 2 to finish the construction.

  The utility pole construction method according to this embodiment has the following effects.

  Since the space between the inner wall of the cylinder 11 and the utility pole 1 is almost filled with the embedded member 2, no depression due to poor backfilling occurs. Moreover, since the embedding member 2 is made of expanded polystyrene, it is lightweight and easy to construct, and the construction efficiency increases.

  Since the cylinder 11 is inserted into the hole 4, the work can be easily performed without the hole 4 being collapsed while the electric pole 1 is inserted into the hole 4 and the embedded member 2 is inserted. Even if 1 is removed when rebuilding in the future, the hole 4 will not collapse, and the rebuilding work can be performed easily. When the utility pole 1 is pulled out, it can be easily pulled out together with the embedding member 2 or by crushing the embedding member 2 so that it is not necessary to dig.

  Since the cylinder 11 also serves as a ground electrode, it is not necessary to fill the ground electrode separately, and the construction cost can be reduced.

(Embodiment 4)
The utility pole construction method according to the fourth embodiment is the same as the third embodiment except that the construction method is different from the third construction method.

  The utility pole construction method according to the present embodiment is different from the third embodiment in that the utility pole 1 and the embedded member 2 are simultaneously placed in the cylinder 11. That is, in this embodiment, as shown in FIG. 7, the embedded member 2 is attached in advance to the lower part of the utility pole 1, and this is placed in the cylinder 11 as it is. The attachment member 2 may be attached to the utility pole 1 by any method such as adhesion, fitting, and binding.

  The utility pole construction method according to the present embodiment has the following effects in addition to the effects of the third embodiment.

  Since the step of attaching the embedded member 2 to the lower part of the utility pole 1 is performed separately and the utility pole 1 with the embedded member 2 is inserted into the cylinder 11, the construction of constructing the utility pole 1 can be performed in a short time. In particular, if the embedded member 2 is attached to the lower part of the utility pole 1 in advance in a factory or the like, the construction time at the site where the utility pole 1 is built can be further shortened, and the construction cost can be reduced.

(Other embodiments)
In addition to the embodiments described so far, the following embodiments may be used.

  In the third and fourth embodiments, the cylinder 11 may be inserted while excavating the hole 4. That is, the cylinder 11 is inserted in order from the place where the excavation is completed, thereby preventing the hole 4 from collapsing during the excavation.

  The soil improvement agent may be any agent that solidifies the ground.

  The material and shape of the embedding member 2 may be any material as long as the space between the surface of the hole 4 or the inner surface of the cylinder 11 and the utility pole 1 can be buried and supported so that the utility pole 1 does not wobble. A hollow material such as a foam material or a honeycomb structure is preferable because it is lightweight, easy to construct, and easy to transport. The material is preferably plastic, rubber or wood, and more preferably plastic that does not corrode and is easy to handle. When the embedded member 2 is attached to the lower portion of the utility pole 1 in advance, the embedded member 2 may be cylindrical or wound in a roll shape.

  The excavation of the hole 4 may be performed by excavating an existing utility pole in addition to excavating the ground 3 where nothing is built. In this case, if the existing utility pole is built by the method of the present application, it is preferable because the utility pole can be pulled out together with the embedded member 2 and the efficiency of the excavation work is increased.

  The shape, material, number, and the like of the ground electrode may be any shape, material, number as long as they serve as a ground.

  Asphalt or concrete may be laid on the backfill soil 7. Moreover, the backfill earth and sand may be earth and sand carried from another place other than the excavated earth and sand.

  In the third and fourth embodiments, the cylinder 11 serves as a ground electrode if at least a part of the surface is made of a conductive member. Therefore, at least a part of the surface only needs to be made of a conductive member.

  As described above, according to the utility pole construction method according to the present invention, the embedded member reliably supports the utility pole and prevents the sinking of the backfill earth and sand, which is useful as a construction method for constructing the support pole of the utility pole or street light. It is.

It is typical sectional drawing of the utility pole landfill part in which the utility pole construction by Embodiment 1 was performed. It is typical sectional drawing which shows the utility pole construction method concerning Embodiment 1 in order of a process. It is the schematic diagram which looked at Drawing 2 (c) from the upper part. It is typical sectional drawing which shows the utility pole construction method concerning Embodiment 2. It is typical sectional drawing of the utility pole landfill part in which the utility pole construction by Embodiment 3 was performed. It is typical sectional drawing which shows the utility pole construction method concerning Embodiment 3 in order of a process. It is typical sectional drawing which shows the utility pole construction method concerning Embodiment 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Telephone pole 2 Embedded member 3 Ground 4 Hole 5 Ground electrode 6 Solidified part 7 Backfill earth and sand 11 Tube

Claims (9)

A utility pole construction method in which a utility pole is inserted into a hole excavated in the ground and buried.
Inserting a power pole into the hole;
Inserting a pre-formed embedded member in the gap between the surface of the hole and the utility pole;
A method of building an electric pole, comprising a step of injecting a soil quality improving agent between the surface of the hole and the embedded member. A utility pole construction method in which a utility pole is inserted into a hole excavated in the ground and buried.
Attaching a pre-formed embedded member to the lower part of the utility pole;
Inserting the portion of the utility pole to which the embedded member is attached into the hole;
A method of building an electric pole, comprising a step of injecting a soil quality improving agent between the surface of the hole and the embedded member. A utility pole construction method in which a utility pole is inserted into a hole excavated in the ground and buried.
Inserting a cylinder having an inner diameter larger than the diameter of the utility pole into the hole;
Inserting the utility pole into the cylinder;
A method of building an electric pole, comprising a step of inserting an embedded member formed in advance in a gap between the inner surface of the cylinder and the electric pole. A utility pole construction method in which a utility pole is inserted into a hole excavated in the ground and buried.
Inserting a cylinder having an inner diameter larger than the diameter of the utility pole into the hole;
Attaching a pre-formed embedded member to the lower part of the utility pole;
Inserting the portion of the utility pole to which the embedded member is attached into the cylinder. The upper end of the embedded member is installed below the ground,
The utility pole construction method according to any one of claims 1 to 4, further comprising a step of placing earth and sand on an upper end of the embedded member.   The utility pole construction method of Claim 1 or 2 which installs a ground electrode in the earth and sand into which the said soil improvement agent was inject | poured.   The utility pole building method according to claim 3 or 4, wherein the step of inserting the tube is performed while excavating the hole.   The utility pole construction method according to claim 3 or 4, wherein at least a part of the surface of the cylinder is made of a conductive member.   The utility pole construction method according to any one of claims 1 to 8, wherein the embedded member is made of plastic, rubber, or wood.

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