Buried guy line structure for supporting utility poles and method for laying buried guy lines

Abstract

To provide a branch line structure which prevents an embedded branch line embedded in the ground from being corroded or electrolytically corroded for a long period of time or even broken, and which can be constructed at a low cost by a safe, reliable and easy work by using a hard case-like concrete coating member having a high insulating effect so as to prevent an embedded branch line from directly contacting the soil and causing electric corrosion.SOLUTION: An embedded branch line structure of a branch line supporting an electric pole includes: a stay block 3 having an anchor portion 4; a steel pipe-like embedded branch line rod 7 embedded in the ground of a branch line 1 connected to the stay block 3 and supporting an electric pole; and a cylindrical coating member 10 for coating the embedded branch line rod 7 in the ground. The coating member 10 is formed of a concrete member, has a structure capable of insulating the steel pipe-like embedded branch line rod 7 from electric current in the ground and has a structure capable of not damaging the embedded branch line rod 7 due to external pressure in the ground.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a guy line structure that supports utility poles, and more particularly to a buried guy line structure and method for laying buried guy lines that are buried underground and support utility poles that hold down and wire heavy electric wires used in railways, etc. [Background technology]

[0002] For example, electric wires used in railway systems are laid under high tension on the tops of utility poles installed beside the tracks, and the utility poles may be pulled by the tension of the electric wires and tilt. Therefore, to prevent such tilting, guy wires have traditionally been provided on utility poles as supports.

[0003] Generally, a guy line structure is composed of, for example, a stay block type foundation that is buried in the ground to hold the guy line that supports the utility pole with a predetermined tension, a buried guy line that is connected to the stay block type foundation and forms the part of the guy line that is buried underground, and an above-ground guy line that is connected to the buried guy line and installed diagonally downward from the upper end of the utility pole and wired above ground.

[0004] In recent years, there have been cases in railway lines where buried support wires connected to the stay block foundations and buried underground have broken due to corrosion or electrolytic corrosion. Therefore, in recent years, in order to prevent such incidents, it has become necessary to use a covering material with high insulating properties to prevent the buried branch line from coming into direct contact with the soil and to prevent electrolytic corrosion.Therefore, there has been a demand for the creation of a branch line structure that will prevent the buried branch line from corroding or electrolytic corrosion over a long period of time, and ultimately from breaking. Here, the invention of JP 2007-198083 A has been generally known as an invention that meets the above-mentioned demands and provides a corrosion-resistant branch line structure for a branch line. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-198083 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the invention of JP 2007-198083 A relates to preventing corrosion of buried portions of pole guy wires that hold relatively light and thin-diameter telephone lines and the like, and is not suitable for preventing corrosion and electrolytic corrosion of pole guy wires that are used to hold relatively heavy electric wires under high tension, as is the object of the present invention, which are large-scale installations. This is because, in the guy line structure according to the above invention, it must be said that the strength, durability and protection against electrolytic corrosion of the buried guy line rods buried in the ground are particularly insufficient.

[0007] As mentioned above, on each railway line, there are cases where the buried branch wires connected to the stay block foundations and buried underground break due to corrosion or electrolytic corrosion. In order to prevent such events, a hard case-like covering material with high insulating properties is used to prevent the buried branch wires from coming into direct contact with the soil and to prevent electrolytic corrosion. There is a further demand for the creation of a branch wire structure that will prevent the buried branch wires from corroding or electrolytic corrosion over the long term and therefore from breaking.

[0008] Thus, the present invention has been devised to solve the above-mentioned conventional problems and in consideration of the above-mentioned demands, and aims to provide a guy line structure that uses a hard-case-like concrete covering member with high insulating properties to prevent the buried guy line from coming into direct contact with the soil and to prevent electrolytic corrosion, so that the buried guy line buried underground will not corrode or electrolytically corrode for a long period of time, and will not break, and that can be installed safely, reliably, and with easy work at low cost. [Means for solving the problem]

[0009] The present invention provides A stay block having an anchor portion and a stay block connected to the stay block and supporting the utility pole. a steel pipe-shaped branch line consisting of an above-ground branch line rod for the above-ground portion and an underground branch line rod for the portion buried underground; a cylindrical protective frame body divided into two or more parts in the circumferential direction that is combined to cover the outer surface of the underground branch line rod, the covering member being formed of a concrete member having a coating that is resistant to electrolytic corrosion or a coating that is resistant to electrolytic corrosion and cannot be damaged by contact with underground objects, and a filler material that fills the space between the outer surface of the hollow portion of the covering member and the outer surface of the buried branch line rod housed in the covering member. It is characterized by the fact that or The split protective frame is prefabricated in a factory, It is characterized by the fact that or The covering member can be connected in a plurality of pieces along the longitudinal direction of the buried branch rod to cover the buried branch rod in accordance with the buried depth of the buried branch rod. It is characterized by the fact that or The joints of the multiple joined covering members are sealed with a filler. It is characterized by the fact that or The joints of the divided protective frame bodies that are assembled into a cylindrical shape are provided with guide grooves formed in an uneven shape, and the divided protective members can be aligned by fitting the guide grooves of the opposing joints of the divided protective members into each other. It is characterized by the following. [Effects of the Invention]

[0010] According to the present invention, in order to prevent the buried branch line from coming into direct contact with the soil and to prevent electrolytic corrosion, a hard case-like concrete covering member with high insulating properties is used, thereby preventing the buried branch line buried underground from corroding or electrolytic corrosion for a long period of time, and ultimately from breaking, and furthermore, achieving the excellent effect of enabling construction to be carried out safely, reliably, and with easy work at low cost. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram illustrating a configuration of a first embodiment. [Figure 2] FIG. 10 is a diagram illustrating the configuration of a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] The present invention will now be described with reference to the accompanying drawings. FIG. 1 shows a first embodiment of the present invention. FIG. 1 illustrates a location where a guy wire 1 supporting a utility pole is buried underground 2 in order to prevent the utility pole from tilting according to the present invention. Reference numeral 3 denotes a stay block. The stay block 3 is composed of a square or disk-shaped anchor portion 4 that serves as an underground fixing plate made of concrete, a substantially cylindrical concrete lower block 5 that is fixed to the upper surface of the anchor portion 4, and a hook mounting portion 6 that is fixed to the anchor portion 4 so as to protrude in an arch shape within the lower block 5.

[0013] Here, a U-shaped hook portion 8 formed on the lower end of a buried steel pipe-shaped branch rod 7 is engaged with the hook mounting portion 6, and the branch line 1 consisting of the buried branch rod 7 and an above-ground branch rod 9 connected to this buried branch rod is installed with a predetermined tension between the upper end of the utility pole and the stay block 3 buried and fixed in the ground, thereby supporting the utility pole so that it does not tilt. The hollow portion of the lower block 5 is filled with, for example, ready-mixed concrete, and then sealed with an inner filling block.

[0014] Here, the mechanism by which the buried guy rod 7 is electrolytically corroded will be explained. The buried guy rod 7, which is a component of the guy line 1 of the utility pole and is buried underground, is made of a steel pipe, which is a precious metal, and the buried guy rod 7 is coated with zinc, which is a base metal. In other words, it is galvanized.

[0015] Conventionally, the zinc-plated steel pipe-shaped buried guy rod 7 is not covered at all underground, and is in constant contact with aqueous solutions such as salt water and acid rain that permeate the ground. This contact generates a voltage, and an ionization current with a positive potential flows through the aqueous solution from the base metal (zinc) to the aqueous solution and then to the noble metal (the steel pipe-shaped buried guy rod 7). At this time, the base metal (zinc) loses its molecules and falls apart, adhering to the precious metal (the buried steel pipe-shaped support rod 7).

[0016] In other words, if the soil in which the steel pipe-shaped buried support rod 7 is buried contains a large amount of precious metals that are resistant to rust, or if salt water or a sulfuric acid solution is seeping into the soil, the steel pipe-shaped buried support rod 7 will be electrolytically corroded by the current (corrosion current) described above, and will eventually break.

[0017] Therefore, in the present invention, the covering member 10 for the buried branch rod 7 is constructed from a hard case-like concrete block of a predetermined thickness, which is an electrically insulating material to electrically insulate the buried branch rod 7, thereby protecting the buried branch rod 7.

[0018] By constructing the covering member 10 from a concrete block of a predetermined thickness, which is an electrically insulating material, even if external pressure occurs underground and comes into contact with the buried branch rod 7, causing damage to the buried branch rod 7, this can be easily prevented by the covering member 10 made of a concrete block of a predetermined thickness.

[0019] External pressures underground include the gnawing of animals such as moles, contact with underground objects due to underground vibrations caused by earthquakes, and damage caused by excavation work in nearby areas for other purposes.

[0020] When performing branch line construction work at a site such as next to railway tracks, it is possible to carry out the work of covering the buried branch line rod 7 with the ready-mixed concrete on site, but there are time and space constraints within railway tracks, making it extremely difficult to pour ready-mixed concrete on site.

[0021] Therefore, in the present invention, the cylindrical covering member 10 that covers the buried branch rod 7 is constructed in advance from a split protective frame body 11 made up of multiple concrete members that are divided into two or more parts circumferentially, and this split protective frame is fabricated in advance at a factory, assembled on site to cover and seal the buried branch rod 7, thereby achieving a completely insulated state and preventing the flow of corrosion current. Furthermore, since the zinc plating itself is protected by the covering member 10, the buried guy rod 7 is further made less susceptible to corrosion.

[0022] Incidentally, the above-mentioned conventional example describes the formation of a guy wire on a utility pole with low tension for crossing a telephone line, and describes that the guy wire 1 is integral with the stay block and is coated with polyethylene.

[0023] However, the present invention is directed to the formation of guy wires for electric poles for electric trains, which are subjected to tensions of several tons, and the poles are subjected to fairly strong tensions. If this conventional technology were applied to the buried guy rod 7 of the guy wire 1 that supports the electric pole for electric trains, it would be necessary to integrate a stay block weighing, for example, 150 kg with the buried guy rod 7, which is about 2 m long, and it is thought that using this conventional invention on site would be extremely inconvenient and would lose its practicality.

[0024] That is, even if twisted wire is used for the buried guy rods 7 and aboveground guy rods 9 and these are integrated with the stay blocks, there is a high possibility that rainwater will seep in from the boundary between the aboveground guy rods 9 and the buried guy rods 7 on the ground surface, which could cause electrolytic corrosion and fracture. Furthermore, twisted wire is not suitable for leaving the buried guy rods 7 underground for the long term, and it is thought that anything other than a steel pipe rod would be difficult in terms of strength and durability.

[0025] In Fig. 1, reference numeral 11 denotes a segmented protective frame that constitutes a covering member 10 that covers the buried guy rod 7. As mentioned above, the segmented protective frame 11 is fabricated in advance from concrete members in a factory, and is then assembled on-site to form the covering member 10.

[0026] 1 and 2, the covering member 10 is configured to have a substantially cylindrical shape, and the split protective frame 11 constituting the covering member 10 is formed in a shape obtained by splitting the covering member 10 in two in the circumferential direction. That is, it has a substantially semicircular cross section, and a substantially semicircular central portion in the axial direction. groove Therefore, when these are assembled, a substantially cylindrical covering member 10 is formed. A cylindrical hollow portion 13 is formed inside, and the buried guy rod 7 is housed in this hollow portion 13. The outer shape of the covering member 10 does not have to be substantially cylindrical, as long as it is tubular.

[0027] In Fig. 1, a first-stage covering member 10 is attached to the top of the lower block 5 in close contact with the upper surface of the lower block 5. That is, a pair of split protective frames 11 are joined together, and the buried guy rod 7 is housed in the hollow portion 13 of the axial core portion. Then, between the contact surface with the lower block 5 and the joint portion 14 of the pair of split protective frames 11, Filler 17 is applied and sealed. In some cases, if there is a slight gap between the outer peripheral surface of the buried branch rod 7 housed in the hollow portion 13 and the inner peripheral surface of the hollow portion 13, Filler 17 It may also be filled with.

[0028] Then, when the installation of this first layer of covering member 10 is complete, earth and sand are backfilled up to this point. Note that reference numeral 15 denotes guide grooves formed, for example, in an uneven shape, provided at the joints 14 of the split protective frame bodies 11, and by fitting the unevenness of the guide grooves 15 at the opposing joints 14 together, alignment can be easily achieved, and the split protective frame bodies 11 can be joined accurately.

[0029] Next, we move on to attaching the second layer of covering member 10. When attaching the second layer of covering member 10, as can be seen from the figure, the joints 14 of the first layer and the second layer are not aligned in a straight line. That is, the joints 14 of the second layer are joined at a point rotated approximately 90° from the joints of the first layer, and are fixed at this point. By adopting this attachment method, the attachment strength of covering member 10 can be improved, and durability can also be improved. Furthermore, the sealing effect can be significantly improved.

[0030] In the embodiment shown in Figure 1, four covering members 10 are installed underground, connected in the longitudinal direction. However, the number of connecting covering members 10 is not limited to four. If the equipment is large, the stay blocks 3 must be installed deeper underground, in which case four or more covering members 10 will be attached and connected in the longitudinal direction of the buried guy rod 7. In some cases, it may be sufficient to use four or fewer covering members 10.

[0031] In this embodiment, the top of the fourth-stage covering member 10 is exposed above ground. This means that there is a risk of rainwater seeping in from this area. For this reason, a closure block 16 is attached to the top end of the fourth-stage covering member 10 to provide a complete seal. This prevents rainwater from seeping in from this area, ensuring long-term durability.

[0032] In conventional inventions, there is a boundary between the polyethylene-coated and uncoated sections of the branch wire, which is made of twisted wire, at the point where it is exposed above ground. Rainwater can easily enter through the gaps in the uncoated twisted wire due to capillary action, and rainwater can also penetrate into the polyethylene-coated twisted wire due to capillary action. Therefore, constructing the branch wire from twisted wire or simply coating it with polyethylene cannot prevent electrolytic corrosion.

[0033] FIG. 2 shows a second embodiment of the present invention. The difference from the first embodiment is the size of the hollow portion 13 of the split protective frame 11. In the first embodiment, the diameter of the hollow portion 13 is large enough to accommodate the buried guy rod 7 to be stored. However, in the second embodiment, the size of the hollow portion 13 is made considerably larger than the diameter of the buried guy rod 7. This is because it is necessary to take into account factors such as the need to absorb errors in the inclination angle of the buried guy rod 7. Therefore, it is believed that using the split protective frame 11 of the second embodiment will further improve work efficiency.

[0034] To briefly explain the construction method of the second embodiment, the ground 2 is excavated and stay blocks 3 are placed, and the ends of the buried guy rods 7 are attached to the stay blocks 3. Next, in order to cover the outer circumferential surface of the buried guy rods 7, the end faces of the split protective frames 11 of a cylindrical covering member 10, which is composed of split protective frames 11 divided into two or more pieces in the circumferential direction, are fixed together, and a filler 17 is filled into the space between the outer circumferential surface of the hollow portion 13 of the covering member 10 and the outer circumferential surface of the buried guy rods 7 housed within the hollow portion 13.

[0035] As described above, the buried guy rod 7 is sealed from the outside by filling with the filler 17, thereby providing a coating that is resistant to electrolytic corrosion or a coating that is resistant to electrolytic corrosion and cannot be damaged by contact with underground objects.The buried guy rod 7 with the filling coating is then buried in the ground. [Explanation of symbols]

[0036] 1 branch line 2 underground 3 Stay Block 4 Anchor part 5 Lower Block 6 Hook mounting part 7 Buried guy rod 8 Hook part 9 Ground guy rod 10 Covering material 11 Split type protective frame 13 Hollow part 14 Seam 15 Guide groove 16 Closure Blocks 17 Filling material

Claims

1. a stay block having an anchor portion, a steel pipe-shaped guy line connected to the stay block and supporting the utility pole, the guy line being composed of an above-ground guy line rod in the above-ground portion and an underground guy line rod in the underground portion; a split protective frame divided into two or more parts in the circumferential direction and configured into a cylindrical shape to cover the outer surface of the underground guy line rod underground, the covered buried guy line rod being sealed and configured to be insulated from underground currents and not be damaged by external pressure underground, a covering member formed of a concrete member having a coating that cannot be electrolytically corroded or a coating that cannot be electrolytically corroded and cannot be damaged by contact with underground objects; and a filler that fills the space between the outer surface of the hollow portion of the covering member and the outer surface of the buried guy line rod housed in the covering member. A buried guy line structure for supporting a utility pole.

2. The split type protective frame body is prefabricated in a factory, 2. A buried guy line structure for supporting a utility pole according to claim 1.

3. The covering member can be connected in a plurality of pieces along the longitudinal direction of the buried branch rod to cover the buried branch rod in accordance with the buried depth of the buried branch rod.

2. The buried guy structure for a guy supporting a utility pole according to claim 1.

4. The joints of the multiple joined covering members are sealed with a filler.

4. The buried guy structure for a guy wire supporting a utility pole according to claim 3.

5. The joints of the split protective frame bodies that are assembled into a cylindrical shape are provided with guide grooves formed in an uneven shape, and alignment can be achieved by fitting the guide grooves at the opposing joints of the split protective members into each other.

2. A buried guy structure for a guy wire supporting a utility pole according to claim 1.

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