JP2023141862A - Columnar structure replacement method - Google Patents

Abstract

To efficiently replace an existing columnar structure with a columnar structure without newly excavating.SOLUTION: A columnar structure replacement method for replacing a hollow cylindrical columnar structure with a base 11 fixed to a concrete foundation 3 with a new columnar structure includes the steps of: cutting an existing columnar structure 1A while leaving the base 11; attaching a connecting jig 20 to an upper end of the base 11 left on the concrete foundation 3; and erecting a newly installed columnar structure 1B on the connecting jig 20. The connecting jig 20 comprises: a fixed base portion 21 placed on the upper end of the base 11; and a fitting cylinder portion 22 penetrating the center of the fixed base portion 21 to extend downward and capable of being fitted into the base 11. The step of attaching the connecting jig 20 to the base 11 includes a step of filling an inside of the fitting cylinder portion 22 with concrete 30.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for replacing a columnar structure, a connecting jig, and a replacement structure for a columnar structure.

Conventionally, as a general utility pole structure, a concrete pole or a steel pipe pole has been used, for example, as shown in Patent Document 1. Each concrete column and steel pipe column is hollow inside. In concrete columnar structures, utility poles erected on the ground, such as roads, need to be rebuilt, that is, replaced, due to damage caused by vehicle collisions, corrosion or deterioration of steel and concrete, and the like. When replacing utility poles, for example, if the construction area is a road, speedy construction work is required, such as the need for traffic regulations to ensure a safe construction environment.

In Patent Document 1, a hollow existing utility pole erected on the ground is cut at a predetermined height from the ground, and a reinforcing steel material is inserted into the lower part of the cut existing utility pole. After that, filler material is filled into the gap between the lower part of the existing utility pole and the reinforcing steel material and solidified, and a new utility pole with an open bottom and an inner diameter that can be inserted into the lower part of the existing utility pole is placed at the bottom of the existing utility pole. It describes how to cover and fix it.

Japanese Patent Application Publication No. 2001-3602

However, in the conventional method of replacing columnar structures, filler material is filled between the bottom of the existing utility pole and the reinforcing steel and allowed to solidify, so it was necessary to ensure sufficient curing time for the filler material to solidify. . In particular, when the filling material is concrete, the pouring and subsequent curing takes a long time, for example, 30 to 40 hours, resulting in time-consuming construction and problems with construction efficiency, so there is room for improvement in terms of speed of construction. Ta.

The present invention has been made in view of the above-mentioned problems, and includes a replacement structure and a replacement treatment for a columnar structure that can be efficiently replaced with a columnar structure by using an existing columnar structure without newly excavating. The purpose of the present invention is to provide a method for replacing fixtures and columnar structures.

In order to achieve the above object, a method for replacing a columnar structure according to the present invention is a columnar structure replacement method in which an existing columnar structure in the shape of a hollow cylinder whose base is fixed to a concrete foundation is replaced with a new columnar structure. The method comprises: cutting an existing columnar structure leaving the base thereof; attaching a connecting jig to the upper end of the base remaining on the concrete foundation; and attaching a new columnar structure to the connecting jig. The connecting jig includes a fixed base part placed on the upper end of the base part, and a fixed base part penetrating through the fixed base part and extending downward. It is characterized by comprising a fitting cylinder part that can be fitted by contacting with the fitting cylinder part.

Further, the connection jig according to the present invention is a connection jig used in the above-described method for replacing a columnar structure, and includes a fixed base part placed on the upper end of the base, and a connecting jig that penetrates the fixed base part. The fitting cylinder part is fixed in a fixed state and extends downward, and can be fitted by being brought into contact with the inner surface of the base part.

Furthermore, the replacement structure for a columnar structure according to the present invention is a replacement structure for a columnar structure in which an existing columnar structure is replaced with a new columnar structure, which is used in the method for replacing a columnar structure described above. The base of the existing columnar structure was cut leaving the base, the connection jig attached to the upper end of the base remaining on the concrete foundation, and the newly constructed columnar structure erected on the connection jig. It is characterized by having a structure.

In the present invention, an existing columnar structure is cut leaving the base, a connecting jig is attached to the upper end of the base remaining on the concrete foundation, a new columnar structure is erected on the connecting jig, and the connecting jig is In the step of attaching the cylindrical part to the base, the fitting cylinder part is brought into contact with the inner surface of the base and fitted by frictional force, thereby efficiently utilizing the existing columnar structure and creating a new columnar structure without the need for new excavation. You can replace it with something and rebuild it.

In this way, in the present invention, the fitting cylinder is brought into contact with the inner surface of the base and fitted by frictional force, so unlike the conventional method, the filling material is allowed to cure until it solidifies before the next operation. This is a construction method that does not require this. Therefore, work efficiency can be improved and work time can be significantly shortened. For example, when the construction area is a road, traffic regulations are necessary to secure the construction environment. Suitable when required.

Further, in the method for replacing a columnar structure according to the present invention, in the step of attaching the connection jig to the base, after fitting the fitting cylinder part to the base, filling the inside of the fitting cylinder part with It may also be characterized by being filled with material.

In this case, the fitting tube of the connection jig is filled with filler, but since the fitting tube and base are fixed by friction, the connection jig is filled with the filler immediately after filling. For this purpose, it is possible to perform work to secure newly constructed columnar structures. In other words, there is no need to wait for the filler to cure until it solidifies before performing the next operation, so it is possible to improve the efficiency of the operation.

Further, the method for replacing a columnar structure according to the present invention is a method for replacing a columnar structure in which an existing columnar structure in the shape of a hollow cylinder whose base is fixed to a concrete foundation is replaced with a new columnar structure, comprising: a step of cutting the existing columnar structure leaving the base; a step of filling the inside of the base remaining in the concrete foundation with filler and fixing anchor bars to the filler to erect it; a step of attaching a connecting jig to a protruding tip of the anchor bar erected on the base; and a step of erecting a newly installed columnar structure on the connecting jig, and the connecting jig includes the steps of: The fixing base part is provided with a fixing base part placed on the upper end of the base part, and the fixing base part has a bolt hole that penetrates in the thickness direction of the fixing base part and allows the anchor bar to be inserted therein, and the connecting jig is inserted into the fixing base part. In the step of attaching to the anchor bar, the protruding tip of the anchor bar is inserted into the bolt hole and fastened with a nut from above the fixed base part.

Furthermore, the replacement structure for a columnar structure according to the present invention is a replacement structure for a columnar structure in which an existing columnar structure is replaced with a new columnar structure, which is used in the method for replacing a columnar structure described above. The base of the existing columnar structure is cut with the base remaining, the filler filled inside the base remains on the concrete foundation, and the base is fixed to the filler inside the base. The method includes an erected anchor bar, a connection jig attached to a protruding tip of the anchor bar erected at the base, and a newly installed columnar structure erected on the connection jig. It is a feature.

In the present invention, an existing columnar structure is cut leaving its base intact, anchor bars are erected inside the base remaining in the concrete foundation, and after filling with filler, a connecting jig is attached to the anchor bars, A connecting jig can be attached to the upper end of the base remaining in the concrete foundation. By erecting a new columnar structure on the connection jig, the existing columnar structure can be efficiently used and replaced with a new columnar structure without any new excavation.

Furthermore, in the present invention, the anchor bars are installed upright inside the base portion of the existing columnar structure that remains after cutting, so the anchor bars can be provided in the vertical direction regardless of the inclination of the base portion. In other words, for example, even if the existing columnar structure is tilted, the base remaining after cutting will also be tilted, but the anchor bars can be installed in the vertical direction, so they can be attached and fixed to the anchor bars. Connection jigs and newly installed columnar structures can be installed vertically.

Moreover, the method for replacing a columnar structure according to the present invention may be characterized in that the lower part of the anchor reinforcement is driven into the concrete foundation.

In this case, by driving anchor reinforcement into the concrete foundation, it can be firmly fixed, and the newly constructed columnar structure can be rebuilt into a stable structure.

Further, the method for replacing a columnar structure according to the present invention is a method for replacing a columnar structure in which an existing columnar structure in the shape of a hollow cylinder whose base is fixed to a concrete foundation is replaced with a new columnar structure, comprising: a step of cutting the existing columnar structure leaving the base; a step of attaching a connecting jig to the upper end of the base remaining on the concrete foundation; and a step of erecting a new columnar structure on the connecting jig. , the connection jig has a fixed base part placed on the upper end of the base part, a support cylinder fixed to the lower part of the fixed base part, and a support cylinder supported by the fixed base part to connect the base part to the base part. and an anchor device that can be fixed by pressing the inner surface of the anchor.

Further, the connection jig according to the present invention is a connection jig used in the above-mentioned method for replacing a columnar structure, and includes a fixed base part placed on the upper end of the base, and a lower part of the fixed base part. The present invention is characterized by comprising a support cylinder fixed to the base, and an anchor device that is supported by the fixed base and can be fixed by pressing against the inner surface of the base.

Furthermore, the replacement structure for a columnar structure according to the present invention is a replacement structure for a columnar structure in which an existing columnar structure is replaced with a new columnar structure, which is used in the method for replacing a columnar structure described above. The base of the existing columnar structure was cut leaving the base, the connection jig attached to the upper end of the base remaining on the concrete foundation, and the newly constructed columnar structure erected on the connection jig. It is characterized by having a structure.

In the present invention, an existing columnar structure is cut leaving the base, a connecting jig is attached to the upper end of the base remaining on the concrete foundation, a new columnar structure is erected on the connecting jig, and the connecting jig is In the process of attaching to the base, the connecting jig is fixed by pressing the inner surface of the base with the anchor device, thereby efficiently utilizing the existing columnar structure and constructing a new columnar structure without newly excavating. It can be replaced and rebuilt.

As described above, in the present invention, since the inner surface of the base is pressed by the anchor device, it is a construction method that does not require waiting for the filling material to harden before performing the next operation as in the conventional method. Therefore, work efficiency can be improved and work time can be significantly shortened. For example, when the construction area is a road, traffic regulations are necessary to secure the construction environment. Suitable when required.

Further, in the method for replacing a columnar structure according to the present invention, in the step of attaching the connection jig to the base, after fixing the anchor device to the inner surface of the base, It may also be characterized in that it is filled with a filler.

In this case, the filling material is filled into the base from the inside of the supporting cylinder of the connection jig, so it is necessary to fix the newly installed columnar structure to the connection jig immediately after filling with the filler material. It can be carried out. In other words, there is no need to wait for the filler to cure until it solidifies before performing the next operation, so it is possible to improve the efficiency of the operation.

Further, the connection jig according to the present invention is characterized in that the anchor device includes a plurality of pressing pieces that can expand in diameter in the radial direction of the columnar structure, and a wedge member that expands the diameter of the pressing pieces. You can also use it as

In this case, in the anchor device that has entered the base, the wedge member is used to expand the plurality of pressing pieces radially outward, so that the plurality of pressing pieces presses the inner surface of the base. This fixes the anchor device within the base, and allows a connection jig with the anchor device to be easily attached to the upper end of the base.

According to the method for replacing a columnar structure, the connection jig, and the replacement structure for a columnar structure of the present invention, an existing columnar structure can be efficiently replaced with a columnar structure without any new excavation. .

FIG. 2 is a longitudinal cross-sectional view showing a replacement structure for the columnar structure according to the first embodiment of the present invention. FIG. 2 is a perspective view showing the configuration of a connection jig used in the method for replacing the columnar structure shown in FIG. 1. FIG. (a) to (c) are diagrams illustrating steps according to a method for replacing a columnar structure. 3(a) to 3(d) are diagrams illustrating steps in the columnar structure replacement method following FIG. 3(c). It is a longitudinal cross-sectional view showing a replacement structure in a columnar structure according to a first modification. It is a longitudinal cross-sectional view which shows the replacement structure in the columnar structure by the 2nd modification. (a) to (d) are diagrams illustrating steps in a method for replacing a columnar structure in the second embodiment. (a) to (d) are diagrams illustrating steps in the columnar structure replacement method following FIG. 7(d). It is a longitudinal cross-sectional view showing a replacement structure in a columnar structure according to a third modification. FIG. 7 is a perspective view showing the configuration of a connection jig used in a method for replacing a columnar structure according to a third embodiment. 11 is a side view of the connection jig shown in FIG. 10. FIG. (a) to (c) are diagrams illustrating steps according to a method for replacing a columnar structure in the third embodiment. 12(a) to (c) are diagrams illustrating steps in the columnar structure replacement method following FIG. 12(c).

Hereinafter, a method for replacing a columnar structure, a connecting jig, and a replacement structure for a columnar structure according to an embodiment of the present invention will be described based on the drawings.

(First embodiment)
A replacement structure 10 for a columnar structure according to the first embodiment shown in FIG. This is a structure in which the columnar structure 1 is replaced by a method of replacing it with a columnar structure (hereinafter referred to as a new columnar structure 1B). Here, the columnar structures 1A and 1B are each made of a steel pipe.

The method for replacing a columnar structure includes a step of cutting the existing columnar structure 1A leaving the base 11, and a step of attaching a connecting jig 20 (see FIG. 2) to the upper end 11a of the base 11 remaining on the concrete foundation 3. The method includes the step of erecting the newly installed columnar structure 1B on the connection jig 20. The process of attaching the connection jig 20 to the base 11 includes a process of filling the inside of the fitting cylinder part 22 with concrete 30 (filling material).
The existing columnar structure 1A is cut almost flush with the upper surface 3a of the concrete foundation 3. The height of the cut surface (upper end 11a) of the base 11 matches the upper surface 3a of the concrete foundation 3.

As shown in FIG. 2, the connection jig 20 is connected to a plate-shaped fixed base portion 21 placed on the upper end 11a of the base 11 of the cut existing columnar structure 1A, and penetrates approximately in the center of the fixed base portion 21. The fitting cylinder part 22 is provided with a fitting cylinder part 22 that extends downward in a closed state and can be fitted into contact with the inner surface 11b of the base part 11.

The fixed base portion 21 has a square shape when viewed from above. The fixed base portion 21 has a circular opening hole 23 in the center thereof having the same diameter as the inner diameter of the fitting cylinder portion 22 . The upper part of the fixed base part 21 and the inside of the fitting cylinder part 22 communicate with each other through the opening hole 23. Concrete 30 is filled into the fitting cylindrical portion 22 through the opening hole 23 .

Furthermore, fixing bolts 24 are fixed to each of the four corners of the upper surface 21a of the fixed base portion 21 in a state that projects upward. A nut 25 is fastened to the fixing bolt 24. A lower end fixing member 40, which will be described later, is fixed to the upper surface 21a of the fixed base portion 21, and is provided at the lower end of the newly installed columnar structure 1B.

The fitting cylinder portion 22 is provided coaxially with the center of the opening hole 23. The outer diameter of the fitting cylinder portion 22 matches the inner diameter of the base portion 11 of the existing columnar structure 1A. That is, as shown in FIG. 1, the outer peripheral surface 22b of the fitting cylinder part 22 is fitted in a state in which it is in contact with the inner surface 11b of the base 11 of the existing columnar structure 1A to the extent that a frictional force can be generated without any gap. has been done.

The length of the fitting cylindrical portion 22 is the same as or shorter than the base 11 of the existing columnar structure 1A. In this embodiment, the lengths of the fitting cylinder portion 22 and the base portion 11 are the same. That is, when the connection jig 20 is fixed, the heights of the lower end 22a of the fitting cylinder part 22 and the lower end 11c of the base part 11 (see FIG. 4(b)) are the same.
The length of the fitting cylindrical portion 22 is sufficient as long as it can ensure stability by fitting into the base 11, and it is more preferable that the length is shorter than the base 11 of the existing columnar structure 1A. In this case, since the concrete 30 filled in the fitting cylinder part 22 also adheres to the base part 11, it can be fixed more reliably.

Concrete 30 is filled in the fitting cylinder part 22 fitted to the base part 11.

The newly installed columnar structure 1B, which is fixed on the connection jig 20 and connected to the base 11 of the existing columnar structure 1A via the connection jig 20, has a lower end fixing member fixed to the connection jig 20 at its lower end portion. 40 are provided.

The lower end fixing member 40 includes a flat plate-shaped fixing plate 41 provided at the lower end of the newly installed columnar structure 1B, and a plurality of (here, four) connecting ribs 42 that further connect the fixing plate 41 and the newly installed columnar structure 1B. , is equipped with.
The fixing plate 41 has the same square shape as the fixing base part 21, and has bolt holes 43 provided at positions through which the four fixing bolts 24 protruding upward from the fixing base part 21 are inserted. .

Next, a method of constructing the above-mentioned replacement structure 10, that is, a method of replacing the columnar structure will be explained based on the drawings.

First, as shown in FIGS. 3(a) and 3(b), the existing columnar structure 1A exposed on the upper surface 3a of the concrete foundation 3 is cut at its root. This cutting method can use gas cutting or a cutting tool such as a cutter, but it is difficult to obtain a smooth cut surface in consideration of reusing the base 11 of the existing columnar structure 1A after cutting. Cutting with a cutter that can be used is preferable. That is, in order to fit the fitting cylinder part 22 of the connection jig 20 into the base part 11 as described later, it is preferable that the cut surface is smooth. At this time, the base 11 that supported the existing columnar structure 1A remains within the concrete foundation 3. All accessories attached to the cut existing columnar structure 1A, such as lights, automatic flashers, and safety devices, will be collected.

Next, as shown in FIGS. 3(c), 4(a), and (b), the fitting cylinder part 22 of the connecting jig 20 is inserted into the hollow part in the remaining base 11, and the connecting jig is 20 is placed on the upper end 11a of the base 11. At this time, the fitting cylinder part 22 is fitted into the center of the base part 11 while maintaining concentricity. In other words, the inner surface 11b of the base 11 and the outer circumferential surface 22b of the fitting cylinder 22 are in contact with each other and there is no clearance. Further, the fixed base portion 21 is placed on the upper surface 3a of the concrete foundation 3.

Next, as shown in FIG. 4(b), concrete 30 is poured through the opening hole 23 (see FIG. 2) of the connection jig 20 placed on the base 11, and the inside of the fitting cylinder 22 is filled with the concrete 30. do. The concrete 30 is filled so as not to overflow from the opening hole 23 of the fixed base part 21 and not to be above the upper surface 21a of the fixed base part 21.
Thereby, the connection jig 20 is fixed to the base 11 of the existing columnar structure 1A.

Next, as shown in FIG. 4(d), the newly installed columnar structure 1B to which the lower end fixing member 40 has been attached in advance is attached to the upper surface 21a of the fixed base portion 21 of the connection jig 20 by fastening with bolts. Specifically, the four fixing bolts 24 protruding upward from the upper surface 21a of the fixed base portion 21 are inserted through the bolt holes 43 (see FIG. 1) of the lower end fixing member 40, and the nuts 25 are tightened onto the fixing bolts 24. As a result, the newly installed columnar structure 1B is fixed in an erected state on the connection jig 20. This work of fixing the newly installed columnar structure 1B can be carried out in a state where the concrete 30 poured into the fitting cylinder part 22 is not solidified. That is, the work of fixing the newly installed columnar structure 1B onto the connecting jig 20 can be performed immediately after filling of the concrete 30 is completed.
Finally, the lighting equipment and accessory equipment are attached to the newly erected columnar structure 1B.
Through such a process, the existing columnar structure 1A can be replaced with the newly installed columnar structure 1B.

Next, the above-mentioned columnar structure replacement method, connection jig, and operation of the replacement structure in the columnar structure will be described in detail based on the drawings.
In this embodiment, the steps of cutting the existing columnar structure 1A leaving the base 11, attaching the connecting jig 20 to the upper end 11a of the base 11 remaining on the concrete foundation 3, and attaching the connecting jig 20 to the newly installed columnar structure are explained. and a step of erecting the object 1B. The connection jig 20 is fixed to a fixed base part 21 placed on the upper end 11a of the base part 11, and is fixed in a state that penetrates the fixed base part 21, extends downward, and is brought into contact with the inner surface 11b of the base part 11 by frictional force. A fitting cylinder part 22 that can be fitted by the fitting cylinder part 22 is provided. The process of attaching the connection jig 20 to the base 11 includes a step of fitting the fitting cylinder part 22 to the base 11 and then filling the inside of the fitting cylinder part 22 with concrete 30.

As a result, the existing columnar structure 1A is cut leaving the base 11, the connection jig 20 is attached to the upper end 11a of the base 11 remaining on the concrete foundation 3, and the new columnar structure 1B is erected on the connection jig 20. In the step of attaching the connection jig 20 to the base 11, the fitting cylinder part 22 is brought into contact with the inner surface 11b of the base 11 and fitted by frictional force, thereby efficiently utilizing the existing columnar structure 1A to create a new structure. It can be replaced with a new columnar structure 1B and rebuilt without excavating. Moreover, in this embodiment, the concrete 30 is filled into the fitting cylinder part 22 of the connection jig 20, but since the fitting cylinder part 22 and the base part 11 are fixed by friction, the concrete 30 is filled with the concrete 30. Immediately after filling, a newly installed columnar structure can be fixed to the connection jig 20.

In this way, in this embodiment, since the fitting cylinder part 22 is brought into contact with the inner surface 11b of the base 11 and fitted by frictional force, the newly installed columnar structure is attached to the connecting jig 20 immediately after filling the concrete 30. You can perform the work of fixing object 1B. In other words, there is no need to wait for the concrete to harden before starting the next work, as was the case in the past, making it possible to improve work efficiency and significantly shorten work time. It is suitable for cases where speedy construction work is required, such as in the case of roads, where traffic regulations are necessary to ensure a safe construction environment.

Furthermore, in this embodiment, excavation around the foundation and removal of a large amount of concrete can be omitted, and there is no need to pour fresh concrete and cure it for constructing a new foundation, thereby simplifying the process. It can be simplified. This makes it possible to significantly shorten the period for rebuilding the columnar structure.

As described above, in the method for replacing a columnar structure, the connection jig 20, and the replacement structure 10 for a columnar structure according to the present embodiment, the existing columnar structure 1A can be used to replace the columnar structure 1B without newly excavating. Can be replaced efficiently.

(First modification)
FIG. 5 shows a replacement structure 10A replaced by a columnar structure replacement method according to a first modification. The replacement structure 10A of the first modification is a structure in which the above-mentioned concrete 30 (filler) is not filled into the fitting cylinder portion 22.
In the case of the first modification, as in the first embodiment described above, by bringing the fitting cylinder part 22 into contact with the inner surface 11b of the base part 11 and fitting it, the existing columnar structure 1A can be used efficiently. It is possible to replace it with a new columnar structure 1B and rebuild it without having to excavate it.

(Second modification)
FIG. 6 shows a replacement structure 10A replaced by a columnar structure replacement method according to a second modification. The replacement structure 10A according to the second modification is a structure in which the horizontal position of the lower end fixing member 40 attached to the newly installed columnar structure 1B can be adjusted using the fixing bolt 24 of the fixed base part 21 of the existing columnar structure 1A. be.

Specifically, between the fixed base part 21 and the fixing plate 41 of the lower end fixing member 40, adjustment nuts 26 are provided which are screwed into each of the plurality of (four) fixing bolts 24. In this case, by adjusting the tightening positions of the four adjusting nuts 26 with respect to the fixing bolts 24 and changing the height of the adjusting nuts 26, it is possible to prevent the fixing plate 41 from tilting, that is, the newly installed columnar structure 1B. can be installed.
In this way, in the second modification, when the base 11 itself of the existing columnar structure 1A is tilted, the fixed base part of the connection jig 20 provided by fitting the fitting cylinder part 22 into the base 11 21 and the newly installed columnar structure 1B fixed to the fixed base part 21 can be suppressed by a simple tilt adjustment means.

(Second embodiment)
Next, a method for replacing the columnar structure according to the second embodiment will be explained based on FIGS. 7(a) to (d) and FIGS. 8(a) to (d).
The method for replacing a columnar structure according to the second embodiment includes the steps of cutting the existing columnar structure 1A leaving the base 11, and filling the inside of the base 11 remaining in the concrete foundation 3 with concrete 30. , a step of attaching a connecting jig 50 to the protruding tip 4a of the anchor bar 4 erected on the base 11, and a step of erecting the newly installed columnar structure 1B on the connecting jig 50. . In the second embodiment, a replacement structure 10B (see FIG. 8(d)) is constructed by replacing the existing columnar structure 1A with a new columnar structure 1B by a replacement method using the connection jig 50.

As shown in FIGS. 7A and 7B, the connection jig 50 includes a flat fixed base portion 51 placed on the upper end 11a of the base portion 11. As shown in FIGS.
The fixed base part 51 has a square shape and has a bolt hole (not shown) in the center thereof that penetrates in the thickness direction of the fixed base part 51 and into which the anchor bar 4 can be inserted. At the center of the lower surface 51b of the fixed base portion 51, a convex curved surface 52 that can be fitted onto the upper portion of the base portion 11 and is convex downward is formed. The convex curved surface 52 is fitted to the base 11 with the fixed base 51 in a horizontal position even when the base 11 is tilted. An anchor fixing nut 54 is tightened onto the protruding tip 4a of the anchor bar 4 inserted into the bolt hole of the fixing base portion 51.

Furthermore, fixing bolts 53 are fixed to each of the four corners of the upper surface 51a of the fixed base portion 51 in a state that projects upward. A nut 55 (see FIG. 7(d)) is fastened to the fixing bolt 53. A lower end fixing member 40, which will be described later, is fixed to the upper surface 51a of the fixed base portion 51, and is provided at the lower end of the newly installed columnar structure 1B.

Next, a method for replacing the columnar structure will be specifically explained.
In addition, in 2nd Embodiment, the example which 1 A of existing columnar structures is fixed to the concrete foundation 3 in the state inclined with respect to the vertical direction is shown.

First, as shown in FIGS. 7(a) and 7(b), the existing columnar structure 1A exposed on the upper surface 3a of the concrete foundation 3 is cut at its root. As for this cutting method, it is preferable to use a cutter that can obtain a smooth cut surface similarly to the first embodiment described above. At this time, the base 11 that supported the existing columnar structure 1A remains within the concrete foundation 3.

Next, as shown in FIGS. 7(c) and 7(d), anchor reinforcements 4 are driven into the remaining hollow parts of the base 11, and concrete 30 is poured inside the base 11. The anchor bars 4 are cast so as to be embedded in the concrete foundation 3 with the longitudinal direction of the anchor bars 4 oriented vertically so as to pass through the cylinder center (center axis O) of the newly installed columnar structure 1B. The upper end (protruding tip 4a) of the anchor reinforcement 4 is positioned to protrude upward from the upper surface 3a of the concrete foundation 3. The concrete 30 poured into the fitting cylinder part 22 is filled so as not to rise above the upper surface 3a of the concrete foundation 3.

Next, as shown in FIGS. 8(a) to 8(c), the convex curved surface 52 of the fixed base portion 51 of the connection jig 50 is attached to the upper end 11a of the base portion 11 with the anchor bar 4 inserted into the bolt hole. Fit it from above. Then, the anchor fixing nut 54 is tightened onto the protruding tip of the anchor bar 4. Thereby, the connection jig 50 is placed on the upper end 11a of the base 11. At this time, the fixed base part 51 is kept concentric with the center of the base part 11, and the convex curved surface 52 is fitted therein.
Thereby, the connection jig 50 is fixed to the base 11 of the existing columnar structure 1A.

Next, as shown in FIGS. 8(c) and 8(d), the newly installed columnar structure 1B to which the lower end fixing member 40 has been attached in advance is attached to the upper surface 51a of the fixed base portion 51 of the connection jig 50 by fastening bolts. Specifically, the four fixing bolts 53 protruding upward from the upper surface 51a of the fixing base portion 51 are inserted into the bolt holes of the lower end fixing member 40, and the connecting jig 50 is tightened to the fixing bolts 53 by tightening the nuts 55. The newly installed columnar structure 1B is erected and fixed on top. This work of fixing the newly installed columnar structure 1B can be carried out while the concrete 30 poured into the base 11 is not solidified. That is, the work of fixing the newly installed columnar structure 1B onto the connection jig 50 can be performed immediately after filling of the concrete 30 is completed.
Finally, the lighting equipment and accessory equipment are attached to the newly erected columnar structure 1B.
Through such a process, the existing columnar structure 1A can be replaced with the newly installed columnar structure 1B.

In the second embodiment, the existing columnar structure 1A is cut leaving the base 11, and the anchor bars 4 are erected inside the base 11 that remains on the concrete foundation 3, and after filling with concrete 30, the anchor bars 4 are The connection jig 50 can be attached to the upper end 11a of the base 11 remaining on the concrete foundation 3. By erecting the new columnar structure 1B on the connection jig 50, the existing columnar structure 1A can be efficiently used and replaced with the new columnar structure 1B without any new excavation. .

Furthermore, in this embodiment, the anchor bars 4 are installed upright inside the base 11 that remains after cutting the existing columnar structure 1A, so the anchor bars 4 can be provided vertically regardless of the inclination of the base 11. Can be done. That is, even if the existing columnar structure 1A is tilted as in this embodiment, the base 11 remaining after cutting is also tilted, but the anchor bars 4 can be provided in the vertical direction. The connection jig 50 attached and fixed to the anchor reinforcement 4 and the newly installed columnar structure 1B can be installed in the vertical direction.

(Third modification)
FIG. 9 shows a replacement structure 10C replaced by a columnar structure replacement method according to a second modification. The replacement structure 10C of the second modification has a configuration in which the lower end 4b of the anchor reinforcement 4 does not protrude below the lower end 11c of the base 11 remaining after cutting the existing columnar structure 1A. That is, in the replacement structure 10C, the anchor reinforcements 4 are not driven into the concrete foundation 3, but are embedded only in the concrete 30 (filler) filled in the fitting cylinder portion 22.

In the case of the third modification, as in the second embodiment, the anchor bars 4 can be fixed by being buried in the concrete 30, so that construction can be carried out efficiently. Moreover, since the anchor bars 4 can be erected vertically, even if the existing columnar structure 1A is tilted, the tilt can be corrected and replaced with the new columnar structure 1B.

(Third embodiment)
Next, a method for replacing a columnar structure according to the third embodiment will be described based on FIGS. 10, 11, 12(a) to 12(d), and 13(a) to 13(d).
The method for replacing a columnar structure according to the third embodiment includes a step of cutting the existing columnar structure 1A leaving the base 11, a step of attaching a connecting jig 60 to the upper end of the base 11 remaining on the concrete foundation 3, and a step of connecting The method includes a step of erecting a newly installed columnar structure 1B on a jig 60. In the third embodiment, a replacement structure 10D (see FIG. 13(c)) is constructed in which the existing columnar structure 1A is replaced with a new columnar structure 1B by a replacement method using a connection jig 60.

As shown in FIGS. 10 and 11, the connection jig 60 includes a fixed base part 61 placed on the upper end 11a of the base 11, a support cylinder 62 fixed to the lower surface 61b of the fixed base part 61, and The anchor device 63 is supported by the base portion 61 and can be fixed by pressing the inner surface 11b of the base portion 11.

The fixed base portion 61 has a square shape when viewed from above. A bolt insertion hole 611 is provided in the center of the fixed base portion 61. The fixed base portion 61 is provided with opening holes 612 on both the left and right sides of the bolt insertion hole 611. The inside of the base 11 is filled with concrete 30 (see FIG. 13(b)) through these openings 612.

Further, fixing bolts 64 are fixed to each of the four corners of the upper surface 61a of the fixed base portion 61 in a state that projects upward. A nut 65 (see FIG. 13(c)) is fastened to the fixing bolt 64. A lower end fixing member 40 (see FIG. 13(c)) provided at the lower end of the newly installed columnar structure 1B is fixed to the upper surface 61a of the fixed base portion 61.

The support cylinder 62 is provided coaxially with the center of the bolt insertion hole 611. The outer diameter of the support cylinder 62 is smaller than the inner diameter of the base 11 of the existing columnar structure 1A. That is, a gap is formed between the outer surface 62a of the support cylinder 62 and the inner surface 11b of the base 11. Note that the outer diameter of the support cylinder 62 may be substantially the same as the inner diameter of the base 11.

The anchor device 63 includes a plurality of (here, two) pressing pieces 66 that can expand in diameter in the radial direction, and a wedge member 67 that expands the diameter of these pressing pieces 66.
The pair of pressing pieces 66 are rotatably supported by a support plate 661 fixed to the lower end 62c of the support cylinder 62 with adjustment bolts 671 of a wedge member 67 (described later) inserted therein. The support plate 661 has an insertion hole 662 through which an adjustment bolt 671 is inserted, extends substantially horizontally, and has pressing pieces 66 supported on both sides in the longitudinal direction. The pair of pressing pieces 66 are arranged to face each other at intervals in the radial direction, and the rotation support portion 66a at the upper end of each is rotatably supported by the support plate 661. When the pair of pressing pieces 66 are not expanded in diameter by the wedge member 67, the pair of pressing pieces 66 are inclined so that the inner surfaces 66b facing the center of each press piece 66 gradually become radially outer from the top to the bottom.

The wedge member 67 is fixed to an adjustment bolt 671 that is inserted into a bolt insertion hole 611 of the fixed base part 61, an adjustment nut 672 that is screwed onto the adjustment bolt 671 above the fixed base part 61, and a lower end of the adjustment bolt 671. and a wedge body 673.

The adjustment bolt 671 has a male thread formed over its entirety, and is provided so as to protrude beyond the fixed base portion 61 and pass through the support cylinder 62 so that its lower end is located below the support plate 661. The adjustment bolt 671 is moved upward by tightening the adjustment nut 672 above the fixed base portion 61.

The wedge body 673 has a truncated conical shape with a smaller diameter on the upper side, and is fixed to the lower end of the adjustment bolt 671. The wedge body 673 is configured not to interfere with the pair of pressing pieces 66 at the initial position (the position indicated by the two-dot chain line in FIG. 11) when inserted into the inside of the base 11. Then, by pulling the adjustment bolt 671 upward by tightening the adjustment nut 672, the wedge main body 673 also moves upward and is pushed between the pair of pressing pieces 66. As a result, the pair of pressing pieces 66 rotate around the rotation support portion 66a so as to expand outward.

Next, a method for replacing the columnar structure will be specifically explained.
In addition, in 3rd Embodiment, the example which 1 A of existing columnar structures is fixed to the concrete foundation 3 in the state inclined with respect to the vertical direction is shown.

First, as shown in FIG. 12(a), the existing columnar structure 1A exposed on the upper surface 3a of the concrete foundation 3 is cut at its root. As for this cutting method, it is preferable to use a cutter that can obtain a smooth cut surface similarly to the first embodiment described above. At this time, the base 11 that supported the existing columnar structure 1A remains within the concrete foundation 3.

Next, as shown in FIGS. 12(b) and 12(c), the support cylinder 62 and anchor device 63 of the connection jig 60 are inserted into the base 11, and the fixed base part 61 is attached to the upper end 11a of the base 11. Place it. Then, as shown in FIG. 13(a), by tightening the adjustment nut 672 of the anchor device 63, the wedge body 673 is pulled up together with the adjustment bolt 671, and the pair of pressing pieces 66 are opened and expanded radially outward. radially and press the inner surface 11b of the base 11. This fixes the connection jig 60 to the base 11.

Next, as shown in FIG. 13(b), concrete 30 is poured into the base 11 through the opening hole 612 provided in the fixed base 61 to fill it.

Next, as shown in FIG. 13(c), the newly installed columnar structure 1B to which the lower end fixing member 40 has been attached in advance is attached to the upper surface 61a of the fixed base portion 61 of the connection jig 60 by fastening bolts. Specifically, the four fixing bolts 64 protruding upward from the upper surface 61a of the fixing base portion 61 are inserted into the bolt holes of the lower end fixing member 40, and the connecting jig 60 is tightened by tightening the nuts 65 onto the fixing bolts 64. The newly installed columnar structure 1B is erected and fixed on top. This work of fixing the newly installed columnar structure 1B can be carried out while the concrete 30 poured into the base 11 is not solidified. That is, the newly installed columnar structure 1B can be fixed onto the connecting jig 60 immediately after filling with the concrete 30 is completed.
Finally, the lighting equipment and accessories are attached to the newly installed columnar structure 1B.
Through such a process, the existing columnar structure 1A can be replaced with the newly installed columnar structure 1B.

In the third embodiment, the existing columnar structure 1A is cut leaving the base 11, a connecting jig 60 is attached to the upper end of the base 11 remaining on the concrete foundation 3, and the newly installed columnar structure 1B is attached to the connecting jig 60. In the step of standing up and attaching the connection jig 60 to the base 11, the anchor device 63 presses the inner surface 11b of the base 11 to fix the connection jig 60, thereby efficiently utilizing the existing columnar structure 1A. The columnar structure 1B can be replaced with a new columnar structure 1B without any new excavation.

In this way, in this embodiment, the anchor device 63 is used to press the inner surface 11b of the base 11, so there is no need to wait for the filling material to harden before performing the next work, as in the conventional construction method. becomes. Therefore, work efficiency can be improved and work time can be significantly shortened. For example, when the construction area is a road, traffic regulations are necessary to secure the construction environment. Suitable when required.

Furthermore, in the method for replacing a columnar structure according to the third embodiment, since the concrete 30 is filled into the base 11 from the inside of the support cylinder 62 of the connection jig 60, the connection jig is replaced immediately after filling with concrete 30. The work of fixing the newly installed columnar structure 1B to the columnar structure 60 can be performed. That is, since there is no need to wait for the concrete 30 to harden before performing the next operation, it is possible to improve the efficiency of the operation.

Further, in this embodiment, in the anchor device 63 that has entered the base 11, the wedge member 67 is used to expand the pair of pressing pieces 66 to the outside in the radial direction. Press the inner surface 11b of. Thereby, the anchor device 63 is fixed within the base 11, and the connection jig 60 having the anchor device 63 can be easily attached to the upper end 11a of the base 11.

Although the embodiments of the method for replacing a columnar structure, the connection jig, and the replacement structure for a columnar structure according to the present invention have been described above, the present invention is not limited to the above embodiments, and departs from the spirit thereof. It can be changed as appropriate to the extent that it does not.

For example, in this embodiment, the case of replacing a columnar structure of a road lighting facility has been described as a preferable application example, but each construction method can also be applied to a columnar structure that supports a sign board of a road sign. be.

Further, the present invention can be applied not only to road signs but also to columnar structures of other road facilities such as traffic lights and protective fence supports. Further, the present invention is not limited to road facilities, but can also be applied to columnar structures or masts such as campus lighting, park lighting, campus bulletin boards, flags, and antennas.

Further, in the embodiment described above, concrete 30 is used as a filler, but it is not limited to concrete 30, and for example, mortar, cement milk, earth and sand, etc. can be used.

In addition, it is possible to appropriately replace the components in the above-described embodiments with well-known components without departing from the spirit of the present invention.

1A Existing columnar structure (existing columnar structure)
1B Newly installed columnar structure (newly installed columnar structure)
3 Concrete foundation 4 Anchor reinforcement 4
4a Projecting tip 10, 10A, 10B, 10C, 10D Replacement structure 11 Base 11b Inner surface 11c Lower end 20, 50, 60 Connection jig 21, 51, 61 Fixed base part 22 Fitting cylinder part 23 Opening hole 24 Fixing bolt 25 Nut 30 Concrete (filling material)
40 Lower end fixing member 41 Bolt hole 52 Convex curved surface 62 Support cylinder 63 Anchor device 66 Pressing piece 67 Wedge member 671 Adjustment bolt 672 Adjustment nut

The present invention relates to a method for replacing a columnar structure .

The present invention has been made in view of the above-mentioned problems, and provides a method for replacing a columnar structure that can be efficiently replaced with a columnar structure by using an existing columnar structure without excavating a new one. The purpose is to

In order to achieve the above object, a method for replacing a columnar structure according to the present invention is a columnar structure replacement method in which an existing columnar structure in the shape of a hollow cylinder whose base is fixed to a concrete foundation is replaced with a new columnar structure. The method includes: cutting an existing columnar structure while leaving its base; attaching a connecting jig to the upper end of the base remaining on the concrete foundation; and attaching a new columnar structure to the connecting jig. and a step of erecting the connection jig, wherein the connection jig includes a fixed base part placed on the upper end of the base, and a fitting cylinder part fixed in a state that penetrates the fixed base part and extends downward. In the step of attaching the connection jig, the fitting cylinder portion is brought into contact with the inner surface of the base portion without a gap and fitted by frictional force.

According to the method for replacing a columnar structure of the present invention, an existing columnar structure can be used to efficiently replace the columnar structure without any new excavation.

Hereinafter, a method for replacing a columnar structure according to an embodiment of the present invention will be described based on the drawings.

The embodiments of the columnar structure replacement method according to the present invention have been described above, but the present invention is not limited to the above embodiments, and can be modified as appropriate without departing from the spirit thereof.

In order to achieve the above object, a method for replacing a columnar structure according to the present invention is a columnar structure replacement method in which an existing columnar structure in the shape of a hollow cylinder whose base is fixed to a concrete foundation is replaced with a new columnar structure. The method comprises: cutting an existing columnar structure leaving the base thereof; attaching a connecting jig to the upper end of the base remaining on the concrete foundation; and attaching a new columnar structure to the connecting jig. and a step of erecting the connection jig, wherein the connection jig includes a fixed base part placed on the upper end of the base, and a fitting cylinder part fixed in a state that penetrates the fixed base part and extends downward. , the fixed base part is formed in a plate shape and is provided to protrude outward from the upper end of the fitting tube part, and in the step of attaching the connection jig, the fixed base part is attached to the concrete foundation. It is characterized in that it is placed on the upper surface, and the fitting tube portion is brought into contact with the inner surface of the base portion without a gap so that the fitting tube portion is fitted by frictional force.

Claims (12)

A columnar structure replacement method for replacing an existing hollow cylindrical columnar structure with a base fixed to a concrete foundation with a new columnar structure, the method comprising:
a step of cutting the existing columnar structure leaving the base;
attaching a connection jig to the upper end of the base remaining on the concrete foundation;
erecting a new columnar structure on the connection jig;
has
The connection jig includes a fixed base part placed on the upper end of the base part, and a fitting that is fixed to the fixed base part in a state that penetrates the fixed base part, extends downward, and can be fitted by contacting the inner surface of the base part. A method for replacing a columnar structure, comprising: a joint tube portion; In the step of attaching the connection jig to the base,
2. The method for replacing a columnar structure according to claim 1, further comprising filling the inside of the fitting cylinder with a filler after fitting the fitting cylinder into the base. A connection jig used in the method for replacing a columnar structure according to claim 1 or 2, comprising:
A fixed base part placed on the upper end of the base part, and a fitting cylinder part that is fixed in a state that penetrates the fixed base part, extends downward, and can be fitted by contacting the inner surface of the base part. A connection jig characterized by: A replacement structure for a columnar structure replaced from an existing columnar structure to a new columnar structure, which is used in the method for replacing a columnar structure according to claim 1 or 2,
a base portion of the existing columnar structure that is cut leaving a base portion;
a connection jig attached to the upper end of the base remaining on the concrete foundation;
A newly installed columnar structure erected on the connection jig;
A replacement structure for a columnar structure characterized by having. A columnar structure replacement method for replacing an existing hollow cylindrical columnar structure with a base fixed to a concrete foundation with a new columnar structure, the method comprising:
a step of cutting the existing columnar structure leaving the base;
Filling the inside of the base portion remaining in the concrete foundation with a filler material, and fixing anchor bars to the filler material to erect it;
a step of attaching a connection jig to a protruding tip of the anchor bar erected at the base;
erecting a new columnar structure on the connection jig;
has
The connection jig includes a fixed base part placed on the upper end of the base,
The fixed base part has a bolt hole that penetrates in the thickness direction of the fixed base part and allows the anchor muscle to be inserted thereinto,
A method for replacing a columnar structure, characterized in that, in the step of attaching the connecting jig to the anchor bar, the protruding tip of the anchor bar is inserted into the bolt hole and fastened with a nut from above the fixed base part. . 6. The method for replacing a columnar structure according to claim 5, wherein the lower part of the anchor reinforcement is driven into the concrete foundation. A replacement structure for a columnar structure in which an existing columnar structure is replaced with a new columnar structure, which is used in the method for replacing a columnar structure according to claim 5 or 6,
a base portion of the existing columnar structure that is cut leaving a base portion;
a filler filled inside the base portion remaining in the concrete foundation;
Anchor bars erected by being fixed to the filler inside the base;
a connection jig attached to a protruding tip of the anchor bar erected at the base;
A newly installed columnar structure erected on the connection jig;
A replacement structure for a columnar structure characterized by having. A columnar structure replacement method for replacing an existing hollow cylindrical columnar structure with a base fixed to a concrete foundation with a new columnar structure, the method comprising:
a step of cutting the existing columnar structure leaving the base;
attaching a connection jig to the upper end of the base remaining on the concrete foundation;
erecting a new columnar structure on the connection jig;
has
The connection jig includes a fixed base part placed on the upper end of the base part, a support cylinder fixed to the lower part of the fixed base part, and a supporting cylinder that is supported by the fixed base part and presses the inner surface of the base part. A method for replacing a columnar structure, comprising: an anchor device that can be fixed by the method. In the step of attaching the connection jig to the base,
9. The method for replacing a columnar structure according to claim 8, further comprising filling the base with a filler from inside the support cylinder after fixing the anchor device to the inner surface of the base. A connection jig used in the method for replacing a columnar structure according to claim 8 or 9,
A fixed base part placed on the upper end of the base part, a support cylinder fixed to the lower part of the fixed base part, and an anchor that is supported by the fixed base part and can be fixed by pressing against the inner surface of the base part. A connection jig comprising: a device; The connecting jig according to claim 10, wherein the anchor device includes a plurality of pressing pieces that can expand in diameter in the radial direction of the columnar structure, and a wedge member that expands the pressing pieces. . A replacement structure for a columnar structure in which an existing columnar structure is replaced with a new columnar structure, which is used in the method for replacing a columnar structure according to claim 8 or 9,
a base that is cut leaving the base of the existing columnar structure;
a connection jig attached to the upper end of the base remaining on the concrete foundation;
A newly installed columnar structure erected on the connection jig;
A replacement structure for a columnar structure characterized by having.

Images