JP2007270547A - Structure and method for installing steel pipe pole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure and a method for installing a steel pipe pole, which can decrease the depth of foundation, which enable the placing of foundation concrete without the arrangement of reinforcements, and which can reduce the cost of foundation work without the need for fastening by an anchor bolt. <P>SOLUTION: Characteristically, an outer pipe 4 is buried in ground 100; the foundation concrete 5 is placed on the bottom of the inside of the outer pipe 4; a lower end 2a of a pole body 2, where a flange 3 by flaring is integrally formed at an outer peripheral edge, is placed, positioned and held on the foundation concrete 5; and post-placed concrete 9 is placed on the foundation concrete 5 between the outer pipe 4 and the pole body 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an installation structure and an installation method of a steel pipe pole in, for example, a communication pole, an illumination pole, or a sign pole installed near the shoulder of a road.

  Conventionally, when installing this type of steel pipe pole, as shown in FIGS. 8A and 8B, a foundation concrete 20 with reinforcing bars 20 a is provided in the ground 100, and the foundation concrete 20 is placed on the foundation concrete 20. The lower end of the pole body 21 is placed, and a plurality of anchors provided on the lower end of the pole body 21 are provided with a base plate 23 reinforced by a plurality of rib plates 22 protruding from the foundation concrete 20. What has the structure formed by fastening to the volt | bolt 24 via the nut 25 is known (for example, refer patent document 1).

Conventionally, as shown in FIGS. 9 (a), 9 (b) and 10, when the foundation concrete 30 with the reinforcing bars 30a is placed on the ground 100, the foundation concrete 30 is divided into two portions. When the foundation concrete 31 is placed for the first time, a plurality of first anchor bolts 33 are embedded, and the couplers 34 screwed and fixed to the first anchor bolts 33 are projected onto the foundation concrete 31. At the same time, the second foundation concrete 32 is placed so that these couplers 34 are exposed on the surface.
Next, a flange 36 attached to the lower end portion of the pole body 35 by fillet welding W is placed on the foundation concrete 32, and a bolt hole 37 having a counterbore process applied to the corner portion of the flange 36 is provided with a second hole. The anchor bolt 38 is inserted, screwed into the coupler 34, and fastened to prevent the head of the second anchor bolt 38 from protruding from the front surface of the flange 36. A technique of backfilling with backfilling soil so as to be on the same surface as the upper surface of the flange 36 is also known (see, for example, Patent Document 2).
JP 2003-343119 A JP 2004-137780 A

In the conventional cases, not only the depth of the foundation is deep, but also in the steel pipe pole installation structure shown in FIG. 8, the rib plate 22 is exposed from the surface of the ground 100, so that the landscape is not only deteriorated. It is easy to get in the way of pedestrians.
Further, in the steel pipe pole installation structure shown in FIGS. 9 and 10, the bolt holes 35 at the corners of the flange 36 are countersunk and backfilled so that the periphery of the flange 36 is flush. Because it is backfilled, the head of the second anchor bolt 38 and the flange 36 do not protrude on the road surface, and the problem of harming the landscape or disturbing the pedestrian can be solved, In order to securely hold the lower end portion of the pole body 35, it is necessary to increase the plate thickness of the flange 36 and increase the strength, which increases the cost.
In any of the above-described techniques, there is a problem that the structure is complicated and the construction is complicated because the reinforcing steel bars and anchor bolts are used.
An object of this invention is to provide the installation structure of the steel pipe pole which can eliminate the said subject, and its installation method.

  In order to solve the above-mentioned problem advantageously, in the first invention, in the steel pipe pole installation structure in which the pole body is installed upright on the foundation concrete placed on the ground, the outer pipe is embedded in the ground In addition, the foundation concrete is provided at the bottom of the outer pipe, and the lower end of the pole body having the flange integrally formed on the outer side of the lower end is placed on the foundation concrete, and the outer pipe is positioned and held. A post-cast concrete is placed on the foundation concrete between the pole and the pole body.

According to a second aspect of the invention, in the steel pipe pole installation structure according to the first aspect of the invention, a flange by flare processing is integrally formed on the outer peripheral edge of the lower end of the pole body.
According to a third invention, in the steel pipe pole installation structure in the first invention or the second invention, a flange by flare processing is integrally formed on the outer peripheral edge of the lower end portion of the outer pipe.

  According to a fourth invention, in the steel pipe pole installation structure according to the first to third inventions, a positioning member for holding the outer peripheral surface of the pole body is provided at an upper portion in the outer pipe.

  In the fifth invention, in the steel pipe pole installation structure according to any one of the first to fourth inventions, the core material is embedded and fixed so that the center axis line is aligned with the axial center of the outer pipe while projecting from the basic concrete. The lower end of the pole body is fitted to the core material.

  The sixth invention is characterized in that in the steel pipe pole installation structure according to any one of the first to fifth inventions, a slip prevention portion is provided on the inner peripheral surface of the outer pipe.

  According to a seventh invention, in the steel pipe pole installation structure according to any one of the first invention to the sixth invention, concrete is cast at a lower end portion in the pole body.

In the method of installing the steel pipe pole of the eighth invention,
In the installation method of the steel pipe pole, which is installed by standing the pole body on the ground,
A step of burying an outer tube in which a flange is integrally provided on the outer periphery of the lower end portion on the ground;
A step of placing foundation concrete at the bottom of the outer pipe and a core material standing on the axis of the outer pipe;
On the foundation concrete, the lower end of the pole body with the flange integrally formed on the outside of the lower end is placed while fitting the core material, and the outer periphery of the pole body is positioned by the positioning member provided in the upper part of the outer tube. Holding and positioning the surface from all sides;
And a step of placing post-cast concrete on the foundation concrete between the outer tube and the pole body.

According to a ninth aspect of the present invention, in the method for installing a steel pipe pole according to the eighth aspect of the invention, the pole body is a pole body in which a flange by flare is integrally formed on the outer peripheral edge of the lower end of the pole body.
According to a tenth aspect, in the method for installing a steel pipe pole according to the eighth or ninth aspect, the outer pipe is integrally formed with a flange by flaring on the outer peripheral edge of the lower end.
According to an eleventh aspect of the invention, in the method for installing a steel pipe pole according to the eighth to tenth aspects of the present invention, the method includes a step of filling a lower end portion in the pole body with a filler.

According to the present invention, the following effects can be obtained.
According to the first invention, the outer pipe is embedded in the ground, the lower end of the pole body is placed on the foundation concrete provided at the bottom of the outer pipe, and the flange is formed on the outer peripheral edge of the lower end of the pole body. Since the post-cast concrete is placed between the outer pipe and the pole body, when the horizontal force acts on the steel pipe pole, the steel pipe pole falls over the post-cast concrete. It can be supported so as not to have a simple structure. In addition, post-cast concrete that is filled and hardened between the outer tube and the pole body has a simple structure with high rigidity that is restrained by the outer tube against deformation that expands in the transverse direction. it can.
Also, by adopting the outer pipe, the holding strength of the steel pipe pole can be increased, the depth of the foundation can be reduced, the foundation concrete can be provided without reinforcing bars, and fastening with anchor bolts is also necessary As a result, there is an effect that the cost of foundation work can be reduced.
In addition, according to the second invention, because the flange by flaring is integrally formed on the outer peripheral edge of the lower end of the pole body, without increasing the thickness of the flange and the flange plate thickness by conventional fillet welding, The work hardening of the flange by plastic working accompanying flare processing can improve the quality and function of rigidity, strength, durability, etc. at the lower end of the pole body, and also the lateral external force acting on the pole body and the vertical direction A sufficient resistance against the pull-out load can be obtained.

  According to the third invention, since the flange by flaring is integrally formed on the outer peripheral edge of the lower end portion of the outer tube, the quality and function such as rigidity, strength, and durability at the lower end portion of the outer tube can be enhanced. An effect is obtained that the resistance against the vertical pull-out load acting on the pole body can be received by the flange of the outer tube through the post-cast concrete.

  According to the fourth invention, since the outer peripheral surface of the pole body is held by the positioning member provided at the upper part in the outer tube, the effect that the lower end portion of the pole body can be stably positioned and obtained is obtained. .

  According to the fifth invention, the core material is embedded and fixed so that the central axis is aligned with the axial center of the outer tube while projecting from the basic concrete, and the lower end portion of the pole body is fitted to the core material. The lower end of the pole body can be positioned and held stably, and the effect of reliably preventing the pole from falling sideways can be obtained.

  According to the sixth aspect of the present invention, the anti-slipping portion provided on the inner peripheral surface of the outer pipe efficiently transmits the stress against the vertical pull-out load acting on the lower end portion of the pole body to the outer pipe through the post-cast concrete. The effect that it can be obtained.

  According to the seventh invention, since the lower end portion in the pole body is filled with the filler, the effect that the lower end portion of the pole body can be stably positioned and held in the outer tube is obtained.

  According to the eighth invention, by adopting the outer pipe, the depth of the foundation can be made shallower, the foundation concrete can be placed without arranging the reinforcing bars, and there is no need for fastening with anchor bolts. The foundation construction cost can be reduced.

  According to the ninth invention, the rigidity and strength at the lower end of the pole body can be obtained by forming the flange by fillet welding as in the past and by hardening the flange by plastic working accompanying flare processing without increasing the plate thickness of the flange. It is possible to easily install a steel pipe pole that can improve the quality and function such as durability, and can sufficiently obtain the resistance against lateral external force acting on the pole body and pulling load in the vertical direction. it can.

  According to the tenth aspect of the invention, since the flange is integrally formed with the flaring flange on the outer peripheral edge of the lower end portion, the flange is formed by fillet welding and the plastic working accompanying the flaring is performed without increasing the thickness of the flange. With the work hardening of the flange, the quality and function such as rigidity, strength, durability, etc. at the lower end of the outer tube can be improved, and the resistance against lateral external force acting on the outer tube and pulling load in the vertical direction can be increased. An outer tube that can be sufficiently obtained can be easily formed.

  According to the eleventh invention, since the lower end portion in the pole body is filled with the filler, the effect that the lower end portion of the pole body can be stably positioned and held in the outer tube is obtained.

  Next, the present invention will be described in detail based on the illustrated embodiment.

  FIG. 1 is a longitudinal sectional view showing a first embodiment of a steel pipe pole installation structure according to the present invention. As shown in FIG. 2, the steel pipe pole 1 used in the present embodiment is composed of a cylindrical pole body 2, and a flange 3 by flare processing is integrally formed on the outer peripheral edge of the lower end portion 2 a of the pole body 2. It has the form which becomes. Such a flare-equipped steel pipe pole 1, as disclosed in Japanese Patent Application Laid-Open No. 2005-351383, is processed with a roller so that the lower end of the pole body 2 is cold-worked and the flare tip is constrained, The central portion in the radial direction of the flange 3 is increased by plastic working accompanying the flare processing, and the flange 3 is integrated with the pole body 2 by the work hardening of the flange 3, so that the width, rigidity, strength, durability, etc. Has the effect of improving quality and function.

  The steel pipe pole 1 has a lower end 2a of the pole body 2 placed on the foundation concrete 5 placed on the bottom of the outer pipe 4 embedded in the ground 100 and protrudes from the foundation concrete 5 The lower end 2a of the pole body 2 is fitted to the core 6 embedded and fixed so that the center axis coincides with the axial center of the tube 4, and the horizontally extending bolt 7 and nut attached to the upper portion of the outer tube 4 The pole body 2 has a configuration in which the outer peripheral surface of the pole body 2 is fastened and held from four sides and positioned and held by a positioning member made of 8 or the like, and the pole body 2 is installed upright on the foundation concrete 5. The basic concrete 5 and the core material 6 may be manufactured in advance.

  In this case, as a positioning member, a nut 8 is welded to the outside of a through hole 4a formed through the upper peripheral surface of the outer tube 4, and a bolt 7 is screwed onto the nut 8 from the outside of the outer tube 4 to the inside. By inserting them together, the pole body 2 is configured to be pressed and held so as to be supported. However, nuts 8 are provided in the outer tube 4, and nuts 8 are provided on both the inner and outer sides of the outer tube 4. May be provided. Further, the positioning member is not limited to the bolt 7 and the nut 8. The pole body 2 may be positioned by pressing it or may be positioned by a spacer or the like.

  Flares 41 are integrally formed on the outer peripheral edge of the lower end portion of the outer tube 4, and a protrusion 42 is provided on the inner peripheral surface of the outer tube 4 as an anti-slipping portion. Post-cast concrete 9 is placed between the pipes 4. In addition, in the case where the protrusion 42 as the stopper is provided on the inner peripheral surface of the outer tube 4, for example, if a plurality of protrusions are formed in parallel on the inner surface of the band-shaped metal plate serving as the outer tube material, the band shape It can be easily formed together with the cylindrical bending of the metal plate. Further, the slip prevention portion is not limited to the protrusion, and may be a concave portion.

Next, the installation process of the steel pipe pole 1 is demonstrated based on the figure shown to Fig.3 (a) (b). First, as shown in FIG. 3A, after the outer pipe 4 is installed in the foundation hole 101 dug in the ground 100, the self-leveling concrete having excellent fluidity is used at the bottom of the outer pipe 4. Then, foundation concrete 5 is placed. At this time, the lower part of the core material 6 is embedded at the same time so as to be positioned at the axial center of the outer tube 4, and the core material 6 is erected. The protruding height of the core material 6 is required not to tilt when the pole body 2 is fitted to the core material 6, and is set by design. Moreover, when the required level of vertical accuracy is low, the foundation concrete 5 and the core material 6 may be manufactured in advance.
The core member 6 is a member for aligning the lower end of the pole body 2 and a member for preventing the pole body 2 from falling. Without the core material 6, the lower end of the pole body 2 is free in the lateral direction in the outer tube 4, so that alignment and positioning are not easy. When the lower end portion of the pole body 2 is fitted to the core member 6, it is sufficient that there is a slight gap between the inner surface of the pole body 2 and the outer peripheral surface of the core member 6. When 2 becomes inclined, it becomes unstable.
Usually, since the upper part of the steel pipe pole for signs or the steel pipe pole for lighting is curved, it is difficult to install it in a vertical state. Positioning of the lower end of the main body 2 and a positioning member consisting of bolts 7 and nuts 8 described later installed at a higher level jointly prevent the pole main body 2 from being tilted, and the pole main body 2 is in a vertical state. Can be temporarily held, and installation work of the pole body can be facilitated.
Further, the outer periphery of the outer tube 4 is backfilled with backfilling soil, or the concrete is casted, leaving the upper outer periphery of the outer tube 4 to which the positioning members made of bolts 7 and nuts 8 are attached. The pipe 4 is buried in the ground 100 and stabilized.

  After the foundation concrete 5 is cured, the lower end 2a of the pole body 2 is placed on the foundation concrete 5 while being fitted to the core member 6, and as shown in FIG. With the positioning member made of, etc., the outer peripheral surface of the pole body 2 is held and positioned so as to be pressed from four directions. For example, the positioning members including the bolts 7 and the nuts 8 may be arranged on three sides of the outer tube 4 at intervals of 120 degrees.

  In this state, post-cast concrete 9 is placed on the foundation concrete 5 between the pole body 2 and the outer tube 4 so as to embed and fix the lower end portion of the pole body 2, and the upper outer periphery of the remaining outer tube 4 The steel pipe pole 1 as shown in FIG. 1 is installed on the ground 100 by backfilling with a backfill soil or by placing concrete.

  That is, according to the above configuration, as shown in FIG. 4, when a lateral external force A acts on the pole body 2 due to, for example, a crosswind, the external body A moves along with the swinging of the lower end 2 a of the pole body 2. As shown by solid line arrows in FIG. 4, resistance by the opposing compressive stresses B and C acts on the post-cast concrete 9 in the pipe 4, and the pole body 2 against the external force A by these opposing compressive stresses B and C. Can be stabilized.

  Further, as shown in FIG. 5, when a vertical pull-out load E acts on the pole body 2, the post-strike is performed via the flange 3 formed on the lower end 2a of the pole body 2 as shown by the solid line arrow in FIG. The drag due to the compressive stress F acts on the concrete 9, and this compressive stress F is transmitted to the outer tube 4 as the pulling stress G through the protrusion 42 protruding on the inner peripheral surface of the outer tube 4, and this pulling stress G acts against the backfill soil or concrete on the outer periphery of the outer tube 4 via the flange 41 formed at the lower end portion of the outer tube 4, and the resistance of the compressive stress H acts on the pole body 2 against the pulling load E. Can be achieved.

  As a result, the holding strength of the steel pipe pole 1 can be increased, the depth of the foundation can be reduced, the foundation concrete can be placed without arranging reinforcing bars, and fastening with anchor bolts as before is also possible. Since it is not necessary, the foundation construction cost can be reduced.

  FIG. 6 is a longitudinal sectional view showing a second embodiment of the steel pipe pole installation structure according to the present invention. In the present embodiment, the pole body 2 has a configuration in which the lower end portion 2a in the pole body 2 is filled with a filler 10 such as concrete or mortar, whereby the pole body 2 can be further stabilized. It is something that can be done.

  FIG. 7 is a longitudinal sectional view showing a third embodiment of the steel pipe pole installation structure according to the present invention. As in the above-described embodiment, the form in which the flange 3 with increased rigidity by flare processing is embedded and fixed at the lower end of the pole body 2 is high in rigidity and stable in quality as compared with the case where it is fixed by welding. The flange 3 may be fixed to the pole body 2 by welding W or the like. Other configurations are the same as those of the above embodiment.

  In each of the above-described embodiments, for example, the outer diameter of the steel pipe pole 1 is 150 to 190 mm, the overhang width of the flange 3 by flaring is about 50 mm, and the outer diameter of the outer pipe 4 is 400 to 500 mm. .

FIG. 2 is a longitudinal side view of a main part showing a first embodiment of a steel pipe pole installation structure according to the present invention. It is an expansion perspective view of a steel pipe pole. (A) is a longitudinal side view of the main part showing the installation process of the steel pipe pole, (b) is a transverse cross-sectional view taken along the line II of FIG. 3 (a). It is explanatory drawing which shows the stress transmission state by lateral external forces, such as a crosswind, with respect to a steel pipe pole. It is explanatory drawing which shows the stress transmission state by the drawing load with respect to a steel pipe pole. It is a vertical side view of the principal part which shows 2nd Embodiment of the installation structure of the steel pipe pole which concerns on this invention. It is a vertical side view of the principal part which shows 3rd Embodiment of the installation structure of the steel pipe pole which concerns on this invention. The conventional installation structure of a steel pipe pole is shown, (a) is a longitudinal side view of the main part, (b) is a cross-sectional view taken along line II-II in (a). The other installation structure of the conventional steel pipe pole is shown, (a) is the vertical side view of the principal part, (b) is a cross-sectional view in the III-III line of (a). It is a principal part expansion vertical side view in the IV section of Drawing 9 (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steel pipe pole 2 Pole main body 2a Lower end part 3 Flange 4 Outer pipe 4a Through-hole 41 Flange 42 Protrusion (slip prevention part)
5 Foundation concrete 6 Core material 7 Bolt (positioning member)
8 Nut (positioning member)
9 Post-cast concrete 10 Filler 100 Ground 101 Foundation hole

Claims (11)

In the steel pipe pole installation structure, where the pole body is installed upright on the foundation concrete placed in the ground,
An outer pipe is embedded in the ground, and foundation concrete is provided at the bottom of the outer pipe. The bottom end of the pole body, which is integrally provided with a flange on the outer periphery of the lower end, is placed and held on the foundation concrete. In addition, the steel pipe pole installation structure is characterized in that post-cast concrete is cast on the foundation concrete between the outer pipe and the pole body.   The steel pipe pole installation structure according to claim 1, wherein a flange by flare processing is integrally formed on the outer peripheral edge of the lower end portion of the pole body.   The steel pipe pole installation structure according to claim 1 or 2, wherein a flange by flare processing is integrally formed on an outer peripheral edge of a lower end portion of the outer pipe.   The steel pipe pole installation structure according to any one of claims 1 to 3, wherein a positioning member for holding the outer peripheral surface of the pole body is provided at an upper portion in the outer pipe.   The core material is embedded and fixed so as to protrude from the basic concrete and the center axis line coincides with the axial center of the outer pipe, and the lower end portion of the pole body is fitted to the core material. The installation structure of the steel pipe pole in any one of.   The steel pipe pole installation structure according to any one of claims 1 to 5, wherein a slip stopper is provided on an inner peripheral surface of the outer pipe.   The steel pipe pole installation structure according to any one of claims 1 to 6, wherein a filler is filled in a lower end portion of the pole body. In the installation method of the steel pipe pole, which is installed by standing the pole body on the ground,
A step of burying an outer tube in which a flange is integrally provided on the outer periphery of the lower end portion on the ground;
A step of placing foundation concrete at the bottom of the outer pipe and a core material standing on the axis of the outer pipe;
On the foundation concrete, the lower end of the pole body with the flange integrally formed on the outside of the lower end is placed while fitting the core material, and the outer periphery of the pole body is positioned by the positioning member provided in the upper part of the outer tube. Holding and positioning the surface from all sides;
A method of installing a steel pipe pole, comprising the step of placing post-cast concrete on the foundation concrete between the outer pipe and the pole body.   The steel pipe pole installation method according to claim 8, wherein the pole body is a pole body in which a flange by flare processing is integrally formed on an outer peripheral edge of a lower end portion of the pole body.   The steel pipe pole installation method according to claim 8 or 9, wherein the outer pipe has a flange formed by flaring integrally with a lower end outer peripheral edge.   The method for installing a steel pipe pole according to claim 8, further comprising a step of filling a filler in a lower end portion in the pole body.

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