JP2008013951A - Split concrete pole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a split pole which is more inexpensive than a steel pole. <P>SOLUTION: The split pole is formed of: two cylindrical bodies, i.e. a lower pole 1 and an upper pole 2 which are connected together in the installation location in a manner sharing an axis with each other; and joint portions 3 (connection structures) arranged at an upper edge of the lower pole 1 and a lower edge of the upper pole 2. Main parts of the lower pole 1 and the upper pole 2 are formed of reinforced concrete. In the joint portion, a joint arranged at the upper edge of the lower pole 1 has a metallic end plate fixed to an upper edge of each reinforcement of the reinforced concrete of the lower pole 1, and a joint arranged at the lower edge of the upper pole 2 has a metallic end plate fixed to a lower edge of each reinforcement of the reinforced concrete of the upper pole 2. Further the joint portion is provided with bolts (fixing means) for fixing the lower and upper end plates together. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to various poles such as a power pole for extending a power transmission line, a telephone pole for extending a telephone line, and an antenna pole for mounting a mobile radio base station antenna on the top, and in particular, at least two of a lower pole and an upper pole The present invention relates to a split pole that connects cylinders at the installation site.

  From the viewpoint of whether or not the poles can be divided, the poles such as the utility poles are divided into an integral pole made up of a pillar of an integral structure that cannot be divided and a divided pole that can be divided into two or more. In terms of materials, the pole can be divided into a reinforced concrete pole and a steel pipe pole. Further, the pole is divided into a circular pole and a non-circular pole when viewed in a cross-sectional shape of a plane orthogonal to the axis. In addition, the circular pole includes a taper type in which the diameter gradually decreases from the lower end part to the upper end part, and a non-taper type in which the diameter is constant from the lower end part to the upper end part.

  In concrete telephone poles with a ground length of 15 meters, the length of the portion embedded in the basement is about 2 meters, and the total length is about 17 meters. If the utility pole is a non-tapered integral type, the diameter is 450 millimeters and the total weight is about 3 tons. If the length is 17 meters, it will not be possible to go around the curve (curved portion of the road) on a narrow road, and it will not be possible to carry it on a truck. In addition, a long object having a length of 17 meters cannot be transported by a truck having a load weight of 4 tons (4 ton truck), which is most commonly used, because of a limitation on the length of the load on a truck. Ton trucks (10 ton trucks) must be transported. The 10-ton truck cannot operate on a narrow road because the length and width of the car itself is large.

  Thus, it is difficult to load a long utility pole on a truck and transport it on a narrow road or a road with a sharp curve. Therefore, in order to enable transportation even on narrow roads and roads with sharp curves, split-type electric poles that are divided into two are adopted. The split-type electric pole has a structure in which two portions of a lower pole and an upper pole are connected by a joint portion, and the lower pole and the upper pole are connected by a joint portion at a place where the electric pole is installed. In order to simplify the structure of the joint portion, a steel pipe made of split pipe is adopted. If divided into two parts, a lower pole and an upper pole, each pole will be 8.5 meters even if the total length after connection is 17 meters, so it can be easily transported by truck on narrow roads and roads with sharp curves. it can. In addition, a 8.5 meter long item is less than the limit of the load on a 4-ton truck, so it can be transported on a 4-ton truck, even on narrower roads than on a 10-ton truck. Can be transported. Moreover, since the split-type electric pole can be transported by a 4-ton truck, it can be transported at a low transportation cost.

The utility pole is subjected to lateral external force due to wind pressure, electric wire tension, etc., so the part buried in the soil is surrounded by concrete called root winding concrete, and installed with increased resistance to lateral external force There are many cases. For root-rolled concrete, a hole is dug in the place where the utility pole is installed, and a utility pole is erected in the hole, and then a wooden frame of 1 meter per side and a depth of 0.7 meters is provided around the utility pole below the ground. The wooden frame was filled with ready-mixed concrete, and the concrete was hardened over a day and night to complete.
JP 2000-303454 A

  Foundation piles of buildings such as buildings are driven deep into the soil until they reach the bedrock, so they are very long and are often constructed by connecting multiple piles with joints. Since poles such as utility poles are subject to large lateral forces such as wind pressure and electric wire tension, if broken at the connecting part, the upper part may fall and cause a serious accident, so the strength of the connecting part is maintained for a long time. There must be. On the other hand, the foundation pile receives a strong axial force when driven into the soil, but receives almost no lateral force such as wind pressure or electric wire tension, and it is held by the surrounding soil, so it breaks at the connecting part. There is no risk of falling. Therefore, in the foundation pile, even if the required strength in the lateral direction is small and the reliability of the required strength in the lateral direction is low over a long period of time, there is no problem in practical use. Therefore, for example, a configuration in which a plurality of concrete foundation piles are connected has been put to practical use, as in the invention disclosed in Japanese Patent Application Laid-Open No. 2000-303454, “Pile connector joint fitting and manufacturing method thereof”.

  Various poles such as power poles for power line extension, telephone poles for telephone line extension, and antenna poles for mounting mobile radio base station antennas on the top receive large lateral forces such as wind pressure and wire tension. However, there has been no concrete split type because there is a concern that the upper part may fall if it breaks at the connecting part, resulting in a serious accident. A conventional split pole is made of steel pipe as described above. Steel pipe poles are about four times as expensive as concrete ones and are expensive.

  Accordingly, an object of the present invention is to provide a split pole that is cheaper than that made of steel pipe.

  In order to solve the above-mentioned problems, the present invention provides the following means.

(1) At least two cylindrical bodies that are used for extending overhead lines such as power transmission lines and telephone lines, installing mobile radio base station antennas, etc., and having a lower pole and an upper pole connected with a common axis at the installation location. In the split type pole provided with a connecting structure for connecting both to the upper end portion of the lower pole and the lower end portion of the upper pole,
The main part of the lower pole and the upper pole is made of reinforced concrete,
The connection structure provided at the upper end of the lower pole has a lower side metal end plate fixed to the upper end of the reinforcing bar in the reinforced concrete of the lower pole,
The connection structure provided at the lower end of the upper pole has an upper metal end plate fixed to the lower end of the reinforcing bar in the reinforced concrete of the upper pole,
A split pole having a fixing means for fixing the lower metal end plate and the upper metal end plate to each other

(2) The diameter of the lower pole is larger than the diameter of the upper pole,
The diameter of the upper metal end plate is substantially equal to the diameter of the lower pole,
A plurality of through holes provided in the upper metal end plate are provided,
A female screw is provided on the lower metal end plate corresponding to each of the through holes,
The divided pole according to (1), wherein the fixing means is a bolt screwed into the female screw through the through hole.

(3) The lower pole and the upper pole have the same diameter,
The diameters of the lower side metal end plate and the upper side metal end plate are larger than the diameters of the lower pole and the upper pole, respectively.
A plurality of through-holes having the same center position are provided in a region projecting outside the lower pole in the lower metal end plate and a region projecting outside the upper pole in the upper metal end plate, respectively.
The division according to (1), wherein the fixing means includes a bolt inserted into the through hole of the lower-side metal end plate and the upper-side metal end plate and a nut screwed into the bolt. Type pole

(4) On the upper side of the lower side metal end plate, a metal tapered concave part that is coaxial with the lower pole is provided,
On the lower side of the upper side metal end plate, a tapered convex portion made of metal that is coaxial with the upper pole is provided,
The tapered pole according to (3), wherein the tapered concave portion and the tapered convex portion have a common tapered shape in which the tapered convex portion is closely fitted to the tapered concave portion.

  (5) The split pole according to (1) to (4) above, wherein the root-wrapped concrete is made of precast divided into two or more.

  According to the present invention, it is possible to provide a split pole made of concrete that is cheaper than that made of steel pipe.

  Next, embodiments of the present invention will be described, and the present invention will be described more specifically with reference to the drawings. 1A and 1B are views showing a first embodiment of the present invention, in which FIG. 1A is a cross-sectional view taken along the line A-A in FIG. 1B, and FIG. 1B is a front view. 2 is an exploded perspective view showing the vicinity of the joint portion of the first embodiment of FIG. 1, and FIG. 3 is a partial cross-sectional view showing the vicinity of the joint portion of the first embodiment of FIG.

  The first embodiment shown in FIG. 1 includes a split pole composed of a lower pole 1, an upper pole 2 and a joint portion 3, a split precast-type root-wrapped concrete 4 and a step bolt fixed to a soil portion of the split pole. 5 is a pole structure. The split pole is a concrete pole with a total length of 15 meters, a soil length of 2.5 meters, and a ground length of 12.5 meters. The lower pole 1 is a non-taper type having a length of 10 meters and a thickness of 45 centimeters. The upper pole 2 is a non-tapered type having a length of 5 meters and a thickness of 35 centimeters. In FIG. L represents the ground. As shown in FIG. 2, a lower joint 31 is provided at the upper end of the lower pole 1, and an upper joint 32 is provided at the lower end of the upper pole 2. The lower joint 31 and the upper joint 32 are fixed with bolts 35 as shown in FIG. The lower joint 31 and the upper joint 32 correspond to the above-described connection structure.

  The structure of the joint part 3 will be described in more detail with reference to FIG. The lower pole 1 has a metal (iron alloy) structure in which an end plate 31a is fixed to the upper end of the reinforcing bar 1b and a reinforcing band 31b is welded to the outer periphery of the end plate 31a in a cylindrical formwork. It is a reinforced concrete cylindrical tube by centrifugal forming method in which the concrete is filled with ready-mixed concrete while rotating the mold with the metal structure around the axis. The thickness of the end plate 31a is 20 millimeters, the thickness of the reinforcing band 31b is 3.2 millimeters, and the width (axial length) of the reinforcing band 31b is 20 centimeters. The end plate 31a is provided with a countersink into which the end of the reinforcing bar 1b is inserted. The end of the reinforcing bar 1b is crimped so as to fit in the countersink, and the end of the crimped reinforcing bar 1b and the end plate 31a are welded. The end plate 31a is firmly fixed to the end of the reinforcing bar 1b.

  An end plate 32 a is fixed to the lower end portion of the upper pole 2. The method for fixing the upper pole 2 and the end plate 32a is the same as the method for fixing the lower pole 1 and the end plate 31a. Moreover, the diameter of the end plate 32a is the same as the diameter of the lower pole 1, and the reinforcing band 32b and the reinforcing plate 32c are welded to the end plate 32a. The thickness of the end plate 32a is 20 millimeters, the thickness of the reinforcing band 32b is 3.2 millimeters, and the width (axial length) of the reinforcing band 32b is 20 centimeters. The thickness of the reinforcing plate 32c is 6 millimeters. The bolt 35 is inserted into a through hole provided in the end plate 32a and is screwed into a female screw provided in the end plate 31a corresponding to the through hole, thereby fixing the end plate 32a and the end plate 31a. The number of through holes in the end plate 32a, the internal thread of the end plate 31a, and the number of bolts 35 are all ten. The connection between the lower pole 1 and the upper pole 2 by the bolt 35 is performed at the installation location of this embodiment.

  FIG. 4 is an exploded perspective view showing the vicinity of the joint portion of the second embodiment of the present invention, and FIG. 5 is a partial cross-sectional view showing the vicinity of the joint portion of the second embodiment of FIG. In the second embodiment, the diameter of the lower pole 1 and the diameter of the upper pole 2 are the same. The diameters of the lower pole 1 and the upper pole 2 are 45 centimeters, similar to the lower pole 1 in the first embodiment of FIG. The upper joint 32 and the lower joint 33 in the second embodiment have the same structure as the upper joint 32 in the first embodiment. However, since the diameters of the upper joint 32 and the lower joint 33 are matched to the diameters of the lower pole 1 and the upper pole 2, they are larger than the upper joint 32 in the first embodiment. In the second embodiment, the diameters of the end plate 33a and the end plate 32a are the same and are larger than the diameters of the lower pole 1 and the upper pole 2, respectively. The end plate 33a and the end plate 32a have through holes in areas projecting outside the lower pole 1 and the upper pole 2, and bolts 36 are inserted into the through holes from above. The nut is screwed, and the end plate 33a and the end plate 32a are fixed by the bolt 36 and the nut. Other structures in the second embodiment are the same as those in the first embodiment.

  FIG. 6 is an exploded perspective view showing the vicinity of the joint portion of the third embodiment of the present invention, and FIG. 7 is a partial cross-sectional view showing the vicinity of the joint portion of the third embodiment of FIG. The third embodiment is a modification of the second embodiment shown in FIGS. The end plates 38a and 37a correspond to the end plate 33a and the end plate 32a in the second embodiment, respectively, and are fixed to the lower pole 1 and the upper pole 2 similarly to the end plate 33a and the end plate 32a. A tapered concave portion 38d and a tapered convex portion 37d are fixed to the end plates 38a and 37a by welding. The tapered concave portion 38d and the tapered convex portion 37d are welded to the end plates 38a and 37a after the end plates 38a and 37a are welded to the reinforcing bars 1b and 2b, respectively. The inclination of the taper recess 38d and the taper protrusion 37d is the same, and after the adhesive is applied to the taper recess 38d, the taper protrusion 37d is fitted into the taper recess 38d, and both are fixed, and then the second embodiment. In the same manner as described above, the end plates 38a and 37a are fixed by the bolt 36, and the lower pole 1 and the upper pole 2 are connected. In the third embodiment, since the tapered convex portion 37d is fitted into the tapered concave portion 38d, it is easy to align the axes of the lower pole 1 and the upper pole 2, and the tapered convex portion 37d is fitted into the tapered concave portion 38d. Therefore, the resistance against lateral external force increases.

  FIG. 8 is an exploded perspective view showing a split precast root wound concrete in a pole structure according to a fourth embodiment of the present invention. In this embodiment, a mode in which the root-wrapped concrete 4 in FIG. 1 is constituted by divided precast-type root-wrapped concrete 4a and 4b and a connecting plate 4c is shown. Semi-circular recesses 4a1 and 4b1 that are fitted to the outer periphery of the lower pole 1 are formed in the split precast-type root-wrapped concrete 4a and 4b, respectively, and an epoxy-based adhesive is previously applied to the surfaces of the semicircular recesses 4a1 and 4b1. Apply. Then, the end poles 4a2 and 4a3 of the root-wrapped concrete 4a are brought into contact with the end surfaces 4b2 and 4b3 of the root-wrapped concrete 4b so that the lower pole 1 is sandwiched between the left and right sides by the divided precast-type root-wrapped concrete 4a and 4b, and the connecting plate 4c The split precast root-wrapped concrete 4a and 4b are connected with each other. The three through holes on the left side of the connecting plate 4c are opposed to the three female screws of the root-wrapped concrete 4a, and the three through-holes on the right side of the connecting plate 4c are opposed to the three female screws of the root-wrapped concrete 4b. Bolts are inserted into the three through holes on the left and right, and the male threads of these bolts are screwed onto the female threads. In the figure, one side of the split precast-type root-wrapped concrete 4a and 4b appears, but a similar female screw is provided on the opposite side surface, and the split pre-cast-type root-wrapped concrete 4a and 4b is connected with another connecting plate and bolt. The opposite side surfaces are also connected, and thus the split precast-type rooted concrete 4a and 4b are firmly fixed to each other by the two connecting plates and also firmly fixed to the lower pole 1. In the fourth embodiment, it is not necessary to wait for the concrete to solidify by simply fixing the divided precast-type root-wrapped concrete 4a and 4b to the lower pole at the pole installation site, so that the pole installation work time can be shortened. . Precast is a reinforced concrete member (PC) manufactured in advance at a factory or the like so that it can be assembled and installed immediately on site.

It is a figure which shows the 1st Embodiment of this invention, (A) is the sectional view on the AA line of (B), (B) is a front view. It is a disassembled perspective view which shows the coupling part vicinity of 1st Embodiment of FIG. It is a fragmentary sectional view which shows the coupling part vicinity of 1st Embodiment of FIG. It is a disassembled perspective view which shows the coupling part vicinity of the 2nd Embodiment of this invention. It is a fragmentary sectional view which shows the coupling part vicinity of 2nd Embodiment of FIG. It is a disassembled perspective view which shows the coupling part vicinity of the 3rd Embodiment of this invention. It is a fragmentary sectional view which shows the coupling part vicinity of 3rd Embodiment of FIG. It is a disassembled perspective view which shows the division | segmentation precast type root winding concrete in the pole structure of the 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lower pole 1a Concrete 1b Reinforcement 2 Upper pole 2a Concrete 2b Reinforcement 3 Joint part 4 Divided precast root winding concrete 4a Split precast root winding concrete 4a1 Semicircular recessed part 4a2 End face of split precast root winding concrete 4a 4a3 Split precast root End face of wound concrete 4a 4b Divided precast root wound concrete 4b1 Semicircular recess 4b2 End face of split precast root wound concrete 4b 4b3 End face of split precast root wound concrete 4b 4c Connection plate 5 Step bolt 31 Lower joint 31a End plate 31b Reinforcement Band 32 Upper joint 32a End plate 32b Reinforcement band 32c Reinforcement plate 33a End plate 33b Reinforcement band 33c Reinforcement plate 35 Bolt 36 Bolt 37 Upper joint Hand 37a End plate 37b Reinforcement band 37c Reinforcement plate 37d Tapered convex portion 38 Lower joint 38a End plate 38b Reinforcement band 38c Reinforcement plate 38d Recessed taper

Claims (5)

It is used for extending overhead lines such as power transmission lines and telephone lines, for installing mobile radio base station antennas, etc., and is equipped with at least two cylindrical bodies consisting of a lower pole and an upper pole connected with a common axis at the installation location. In the divided poles, each of which is provided with a connection structure for connecting the lower pole and the lower pole of the upper pole, respectively.
The main part of the lower pole and the upper pole is made of reinforced concrete,
The connection structure provided at the upper end of the lower pole has a lower side metal end plate fixed to the upper end of the reinforcing bar in the reinforced concrete of the lower pole,
The connection structure provided at the lower end of the upper pole has an upper metal end plate fixed to the lower end of the reinforcing bar in the reinforced concrete of the upper pole,
A split pole having a fixing means for fixing the lower metal end plate and the upper metal end plate to each other The diameter of the lower pole is larger than the diameter of the upper pole,
The diameter of the upper metal end plate is substantially equal to the diameter of the lower pole,
A plurality of through holes provided in the upper metal end plate are provided,
A female screw is provided on the lower metal end plate corresponding to each of the through holes,
The split pole according to claim 1, wherein the fixing means is a bolt screwed into the female screw through the through hole. The lower pole and the upper pole have the same diameter,
The diameters of the lower side metal end plate and the upper side metal end plate are larger than the diameters of the lower pole and the upper pole, respectively.
A plurality of through-holes having the same center position are provided in a region projecting outside the lower pole in the lower metal end plate and a region projecting outside the upper pole in the upper metal end plate, respectively.
2. The split mold according to claim 1, wherein the fixing means includes a bolt inserted into the through hole of the lower-side metal end plate and the upper-side metal end plate and a nut screwed into the bolt. Pole On the upper side of the lower-side metal end plate, a tapered recess made of metal that is coaxial with the lower pole is provided,
On the lower side of the upper side metal end plate, a tapered convex portion made of metal that is coaxial with the upper pole is provided,
4. The split pole according to claim 3, wherein the tapered concave portion and the tapered convex portion have a common tapered shape in which the tapered convex portion is closely fitted to the tapered concave portion.   The split pole according to any one of claims 1 to 4, wherein the root-wrapped concrete is made of precast divided into two or more.

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