JP6619136B2 - Composite column structure and existing concrete column replacement method - Google Patents

Description

  The present invention relates to a composite column structure for renewing an existing concrete column and an existing concrete column renewal method.

  Conventionally, in order to prevent the collapse of existing old concrete columns due to deterioration, a renewal method has been proposed in which a new column is built in the vicinity of the existing concrete column and then the electric wire is replaced with the new column. ing.

  However, according to the renewal method that installs a new pillar separately, it is necessary to secure a new site for building the new pillar, and it is also possible to construct a new foundation to support the new pillar. Necessary.

  For this reason, this renewal method can not be used when it is difficult to secure a new site, and not only the total construction period required for new construction of foundations etc. is prolonged. The construction cost may increase. Then, the update construction method currently disclosed by patent document 1, 2 is proposed as what updates using an existing concrete pillar, for example.

  In the renewal method disclosed in Patent Document 1, the existing concrete utility pole is cut from the ground part, and then the aggregate is put into the root portion remaining in the ground, and the lower half of the lower short steel pipe column material By inserting a part and placing mortar in the gap between the short steel pipe column and the base part, the short steel pipe column is built, and the intermediate short steel pipe column and A steel pipe column having a certain height is formed by connecting and fixing the upper short steel tube column material.

  In addition, the renewal method disclosed in Patent Document 2 is such that a half steel pipe for reinforcement is planted on an overhang portion such as a railing provided on a viaduct for an electric railway, and the base portion of an existing concrete column A reinforcing half steel pipe is assembled so as to be in close contact with the outside from the outside, and the reinforcing half steel pipe is fixed to the overhanging portion using a frame.

JP 2000-199357 A JP-A-8-232505

  However, the renewal method disclosed in Patent Document 1 is exposed because the existing concrete utility pole is cut off from the ground part, and the internal reinforcement of the concrete utility pole is exposed at the ground part. Due to the progress of corrosion of internal rebars, there was a risk that the existing concrete utility poles would cause a decrease in strength at the roots. In addition, the renewal method disclosed in Patent Document 1 may cause a water channel to be formed in the mortar placed in the gap between the lower short steel pipe column and the base portion, and the root of the existing concrete electric pole. There was a problem that the progress of corrosion became remarkable in the insertion portion.

  Furthermore, in the renewal method disclosed in Patent Document 1, since the diameter of the steel pipe column material is necessarily smaller than that of the existing concrete electric pole, it is difficult to increase the proof stress of the steel pipe column material, and the load acting on the electric pole is It is difficult to design when it is large.

  In the renewal method disclosed in Patent Document 2, the half steel pipe for reinforcement is installed from the outside of the existing base of the existing concrete column, so that the strength of the existing base after reinforcement is the strength of the existing base at the initial design. There is a high possibility of exceeding. Therefore, in the renewal method disclosed in Patent Document 2, the strength of the existing base after reinforcement exceeds the strength of the ground foundation, so that the structure foundation is destroyed in the ground foundation where inspection and repair are very difficult. Therefore, in order to avoid destruction of the ground foundation, an excessive base plate, a frame material for fixing, and the like are essential, and it is necessary to reduce the burden on the ground foundation.

  The renewal method disclosed in Patent Document 2 is because the reinforcing half-ply steel pipe assembled so as to be in close contact with the existing concrete column from the outside uses the existing concrete column and the overhanging portion of the handrail as it is. In the case where the strength of existing concrete columns, railings, etc. is reduced due to aging, there is a possibility that the half steel pipe for reinforcement cannot be sufficiently supported. In addition, the renewal method disclosed in Patent Document 2 uses a steel material with a complicated shape for a reinforcing half steel pipe, a frame material for fixing the steel pipe, a base plate, and the like. There was a risk of increase.

  Therefore, the present invention has been devised in view of the above-described problems, and the object of the present invention is to easily update an overhead wire column, a distribution column, etc. by using an existing concrete column and collapse it. It is to provide a composite column structure and an existing concrete column renewal method that can prevent the above.

A composite column structure according to a first invention is a composite column structure for renewing an existing concrete column, and includes an existing base projecting from a ground surface, and a diameter expansion pipe provided to cover the existing base. the existing base is formed by cutting the existing concrete column, said radially enlarged tube, the reduced diameter portion disposed above the existing base, with a larger inner diameter than said reduced diameter portion The inner diameter was increased from the inner diameter of the reduced diameter portion to the inner diameter of the enlarged diameter portion at the boundary between the enlarged diameter portion spaced a predetermined distance from the outer diameter of the existing base and the reduced diameter portion and the enlarged diameter portion. A boundary step portion, and the inside of the enlarged diameter portion and the boundary step portion covered with the existing base portion is filled with a time-curable material until the entire inner surface of the boundary step portion comes into contact with the boundary step portion. The stepped portion faces the inner surface of the boundary stepped portion toward the existing base portion. State, characterized in that it is arranged so as to protrude toward the inside of the enlarged diameter portion.

  The composite column structure according to a second aspect of the present invention is the composite column structure according to the first aspect, wherein the existing base is cut at a position that is at least 1.5 times the outer diameter of the existing base in the height direction from the ground surface. It is formed by doing.

  In the composite pillar structure according to a third aspect of the present invention, in the first aspect or the second aspect, the existing base portion has an inner space formed in a substantially hollow shape, and a reinforcing steel material is inserted into the inner space. It is characterized by.

  The composite column structure according to a fourth invention is characterized in that, in the third invention, the reinforcing steel material is a steel pipe, a section steel, or a reinforcing bar.

The composite columnar structure according to a fifth aspect of the present invention is characterized in that the diameter expansion pipe is provided with a plurality of projecting members that project from the inner surface of the diameter expansion portion toward the outer surface of the existing base portion.
The composite pillar structure according to a sixth aspect is characterized in that an inner diameter of the reduced diameter portion is smaller than an outer diameter of a protruding portion protruding from the ground surface of the existing base portion.

The existing concrete column renewal method according to the seventh invention is an existing concrete column renewal method for renewing an existing concrete column, and cutting an existing concrete column at a predetermined position in the height direction from the ground surface, A cutting step of forming an existing base projecting from the ground surface, a reduced diameter portion disposed above the existing base, an inner diameter larger than the reduced diameter portion, and an expansion spaced apart from the outer diameter of the existing base by a predetermined distance. A diameter-expanded pipe having a diameter step and a boundary step portion having an inner diameter increased from the inner diameter of the reduced-diameter part to the inner diameter of the enlarged-diameter part at the boundary between the reduced-diameter part and the enlarged-diameter part. An installation step in which the inner surface of the stepped portion is directed toward the existing base portion so as to protrude toward the inside of the enlarged diameter portion so as to cover the existing base portion, and the diameter expansion applied to the existing base portion Inside the border step and the boundary step Characterized in that it comprises a filling step of filling a resistant material until it abuts against the entire inner surface of the boundary stepped portion.

In the existing concrete column renewal method according to the eighth aspect of the present invention , in the filling step, the expanded diameter portion covered on the existing base portion is filled inside the expanded diameter portion while being supported by an anchor member or a support member. A time-curable material is cured.

According to the first to eighth inventions , a boundary step is formed at the boundary between the reduced diameter portion and the enlarged diameter portion, and a vertical load is transmitted from the enlarged diameter portion of the enlarged diameter tube to the protruding portion of the existing base, Since the vertical load is transmitted to the ground surface by the existing base, it is possible to prevent the diameter-expanded pipe installed as a new steel pipe column from sinking or collapsing due to its own weight and external force.

According to 1st invention- 8th invention , since the diameter of the diameter reduction part in a newly installed diameter expansion pipe can be made into the same grade as the diameter of an existing concrete pillar, the proof stress of a newly installed steel pipe pillar is enlarged. Is possible. Therefore, even when a large external force acts on a newly installed steel pipe column, it is not necessary to provide an excessive base plate or a member with a complicated shape. It becomes possible to update economically in a short period of time.

According to the first to eighth inventions , since the expanded pipe is provided so as to cover the existing base portion, the time-curable material filled in the inner space of the existing base portion or disposed inside the existing base portion. PC steel wire etc. will not be exposed to the outside, avoiding the formation of water channels in the mortar etc. of the inner space of the existing base, and by suppressing the progress of corrosion of the PC steel wire, Corrosion of the existing base of the existing concrete column can be prevented, and collapse of the expanded pipe using the existing concrete column can be prevented.

  In particular, according to the second invention, the projecting portion of the existing base portion and the enlarged diameter portion of the enlarged diameter tube are provided so as to overlap each other within a predetermined extension range in the height direction, and the horizontal acting on the enlarged diameter tube. The load and bending moment are transmitted from the expanded part of the expanded pipe to the protruding part of the existing base, so that the expanded pipe installed as a new steel pipe column can be used horizontally by using the existing base of the existing concrete column. It is possible to prevent collapse due to load and bending moment.

  In particular, according to the third invention and the fourth invention, when the existing concrete column is a prestressed concrete column by inserting a reinforcing steel material into the inner space of the existing base portion, the existing concrete column is cut by the cutting. Even if the tension of the PC steel wire arranged inside the column disappears, it is possible to realize the reinforcement that replaces the tension of the PC steel wire with the reinforcing steel material provided in the inner space of the existing base. It becomes possible.

  In particular, according to the fifth aspect of the present invention, the plurality of projecting members projecting from the inner surface of the enlarged diameter portion toward the outer surface of the projecting portion of the existing base portion are provided, thereby projecting at the upper and lower stages in the height direction of the enlarged diameter portion. By varying the protruding length of the member, finely adjusting the inclination angle of the expanded diameter pipe with respect to the ground surface, and by varying the protruding length of the protruding member at each location in the circumferential direction of the expanded diameter portion, By finely adjusting the horizontal position of the expansion pipe, it is possible to economically update the overhead poles, distribution poles, etc. in a short period of time.

  Further, according to the fifth invention, the projecting member acts as a detent between the newly-expanded expanded pipe and the time-hardening material integrated with the existing concrete column, so that the structure has a larger bending. Yield strength and vertical strength can be ensured.

In particular, according to the seventh invention and the eighth invention , by using the existing concrete pillar, the overhead line pillar, the distribution pillar, etc. can be economically updated in a short period without requiring a new site, It is possible to prevent collapse of the updated overhead wire pole, power distribution pole, etc., and while supporting the enlarged diameter part of the enlarged diameter pipe covered on the existing base by the anchor member or the support member, the inside of the enlarged diameter part By expanding the time-curable material filled in the space, the diameter-expanded tube with the anchor member or the support member until the predetermined time elapses until the time-curable material is cured and exhibits a certain strength. It is possible to prevent collapse of the expanded diameter pipe and the like, and it is possible to operate a railway or the like in the vicinity of the overhead pole until a predetermined time elapses.

It is a whole perspective view which shows the composite pillar structure to which this invention is applied. (A) is the whole front view which shows the existing concrete pillar before the cutting | disconnection where the composite pillar structure to which this invention is applied is used, (b) is the whole front view which shows the existing concrete pillar after a cutting | disconnection. . It is a front view which shows the composite pillar structure to which this invention is applied. It is a front view which shows the reinforcement steel material penetrated by the inner space part of the existing base by the composite pillar structure to which this invention is applied. It is a top view which shows the reinforcing steel material penetrated by the internal space part of the existing base by the composite pillar structure to which this invention is applied. It is a front view which shows the protrusion member provided in the enlarged diameter part of the enlarged diameter pipe by the composite pillar structure to which this invention is applied. It is a top view which shows the protrusion member provided in the enlarged diameter part of the enlarged diameter pipe by the composite pillar structure to which this invention is applied. It is a whole front view which shows the electric wire replaced by the newly installed steel pipe pillar by the existing concrete pillar update construction method to which this invention is applied. It is a front view which shows the cutting process which cuts the existing concrete pillar by the existing concrete pillar update construction method to which this invention is applied, and forms an existing base. It is a front view which shows the process of inserting a reinforcement steel material in the inner space part of an existing base, after cutting an existing concrete pillar by the existing concrete pillar update construction method to which this invention is applied. It is a front view which shows the installation process which provides a diameter expansion pipe so that an existing base may be covered with the existing concrete pillar update construction method to which this invention is applied. It is a front view which shows the process of tightening the protrusion member provided in the diameter expansion part of the diameter expansion pipe by the existing concrete pillar update construction method to which this invention is applied. It is a front view which shows the filling process which fills a time-hardenable material inside the enlarged diameter part covered on the existing base by the existing concrete pillar renewal construction method to which this invention is applied. It is a front view which shows the process of supporting the enlarged diameter part covered on the existing base by the existing concrete pillar renewal construction method to which this invention is applied with an anchor member. It is a front view which shows the process of supporting the enlarged diameter part covered on the existing base with the existing concrete pillar renewal construction method to which this invention is applied with a support member. (A) is a front view which shows the vertical load etc. which act on a diameter expansion pipe with the composite column structure to which this invention is applied, (b) is the vertical which acts on a half steel pipe with the conventional half steel pipe for reinforcement. It is a front view which shows a load etc. It is a front view which shows the diameter expansion pipe which has a taper-shaped diameter expansion part by the composite pillar structure to which this invention is applied.

  Hereinafter, the form for implementing the composite pillar structure 1 to which this invention is applied is demonstrated in detail, referring drawings.

  As shown in FIG. 1, the composite column structure 1 to which the present invention is applied is mainly used to update an existing concrete column 7 installed as an overhead wire column, a distribution column, or the like.

  As shown in FIG. 2A, the existing concrete column 7 is formed in a substantially circular shape having a predetermined outer diameter D1 in the width direction X and has a substantially hollow shape having a predetermined extension in the height direction Y. Columns such as prestressed concrete are used.

  The existing concrete column 7 has deteriorated over time due to a long period of installation of columns such as prestressed concrete, and the lower end portion 7a is embedded in the ground 8 and upwards from the ground surface 8a to the upper end portion 7b. It is in a state where it is extended and installed.

  As shown in FIG. 2 (b), the existing concrete pillar 7 has a pillar body such as prestressed concrete at a predetermined position in the height direction Y from the ground surface 8a while the lower end portion 7a is rooted in the ground 8. By cutting, the existing base 2 is formed.

  As shown in FIG. 3, the composite column structure 1 to which the present invention is applied includes an existing base 2 that protrudes from the ground surface 8 a and a diameter expansion pipe 3 that is provided so as to cover the existing base 2.

  The existing base 2 has a protruding portion 21 protruding from the ground surface 8a and a root portion 22 embedded in the ground 8, and by cutting an existing concrete column 7 having a predetermined outer diameter D1. The protrusion 21 has a predetermined outer diameter D1.

  The existing base portion 2 is, for example, a position that is 1.5 times or more and 2.5 times or less the outer diameter D1 of the protruding portion 21 in the height direction Y from the ground surface 8a, in particular, 2 of the outer diameter D1 of the protruding portion 21. It is formed by cutting the existing concrete pillar 7 at a position of about 0 times.

  Since the existing base portion 2 is formed by cutting the substantially hollow existing concrete pillar 7, the existing base portion 2 has an inner space portion 20 that is continuously formed in a substantially hollow shape from the protruding portion 21 to the root insertion portion 22. . The existing base 2 has, for example, an outer diameter D1 of the protruding portion 21 of about 150 mm to 400 mm, a thickness T of about 50 mm to 150 mm, and an inner diameter D0 of about 50 mm to 100 mm.

  In the existing base 2, for example, when the outer diameter D1 of the protruding portion 21 is 350 mm, the extension L1 in the height direction Y of the protruding portion 21 protruding from the ground surface 8a is about 700 mm. In the existing base 2, for example, the extension L <b> 2 in the height direction Y of the root portion 22 rooted in the ground 8 is about 2000 mm.

  The diameter-expanded pipe 3 is a steel pipe having a substantially circular cross section and a substantially hollow shape. The diameter-reduced part 31 is disposed above the existing base 2 and the inner diameter D2 is larger than the diameter-reduced part 31. And an enlarged diameter portion 32. For the diameter expansion tube 3, for example, STK400 (JIS G 3444) is used, and the plate thickness t is set to about 3.2 mm to 12.7 mm, and plating treatment is performed as necessary.

  The diameter-expanded tube 3 is reduced at the boundary between the diameter-reduced part 31 and the diameter-expanded part 32, for example, by setting the inner diameter D3 of the diameter-reduced part 31 to about 145 mm to 400 mm and the diameter D2 of the diameter-expanded part 32 to about 155 mm to 450 mm. The boundary step portion 30 is formed by increasing the inner diameter from the inner diameter D3 of the diameter portion 31 to the inner diameter D2 of the expanded diameter portion 32. In the expanded diameter tube 3, for example, the extension L3 in the height direction Y of the expanded diameter portion 32 is about 700 mm or more.

  The expanded diameter tube 3 is provided so that the inner diameter D2 of the expanded diameter portion 32 is larger than the outer diameter D1 of the protruding portion 21 so as to cover the existing base portion 2, so that the expanded diameter portion 32 covers the existing base portion 2. It will be a thing. The expanded diameter tube 3 has the expanded diameter portion 32 covered with the existing base 2, and the inner surface 32 a of the expanded diameter portion 32 and the outer surface 21 a of the protruding portion 21 of the existing base 2 are separated by, for example, about 2 mm to 25 mm. Or abut.

  The diameter-expanded tube 3 is a space S inside the diameter-expanded portion 32 that covers the existing base portion 2 and is filled with a time-curable material 4 such as mortar at least between the boundary step portion 30 and the protruding portion 21. The The time-curable material 4 is a material that hardens and becomes a solidified material when a fluid material having high fluidity passes a predetermined time. In addition to mortar or concrete, a high-hardness adhesive material such as a resin system is used. Etc. are used.

  The time-curable material 4 is filled in the space S inside the enlarged diameter portion 32 from the inner space 20 of the existing base portion 2 to at least the boundary step portion 30 of the enlarged diameter tube 3, and after a predetermined time has elapsed. It will be cured. The time-curable material 4 fills the space S inside the enlarged diameter portion 32 and cures, so that the cured time-curable material 4 comes into contact with the inner surface 30a of the boundary step portion 30.

  In the composite column structure 1 to which the present invention is applied, a reinforcing steel material 5 may be provided in the inner space 20 of the existing base 2 as necessary, as shown in FIG. At this time, in the existing base 2, the reinforcing steel material 5 is continuously inserted into the inner space 20 from a predetermined position of the insertion portion 22 in the height direction Y to the protruding portion 21, and the upper end 5 a of the reinforcing steel material 5. Can be protruded upward from the inner space 20 of the existing base 2.

  As shown in FIG. 5, the reinforcing steel material 5 includes a steel pipe 50 having a substantially circular cross section, a shaped steel 51 such as an H-shaped steel, an angle steel, and a grooved steel, or a rebar 52 such as a deformed reinforcing bar. When a plurality of reinforcing bars 52 are arranged in a substantially circular shape or the like, the reinforcing steel material 5 is provided with hoop bars 52a so as to surround the reinforcing bars 52 as necessary, thereby shearing the reinforcing steel material 5 Strength will be improved.

  As shown in FIG. 6, the composite column structure 1 to which the present invention is applied includes a plurality of screws, bolts, or the like, for example, by penetrating the enlarged diameter portion 32 of the enlarged diameter tube 3 in the plate thickness direction as necessary. A protruding member 35 is provided. At this time, the diameter-expanded tube 3 is provided with a plurality of projecting members 35 such as a plurality of screws projecting from the distal end portion 35a from the inner surface 32a of the diameter-expanded portion 32 toward the outer surface 21a of the projecting portion 21 of the existing base 2. Become.

  For example, the protruding member 35 is provided in two stages in the height direction Y of the enlarged diameter portion 32. The protruding member 35 is not limited to this, and is provided in three or more stages in the height direction Y of the enlarged diameter portion 32 when the extension L3 of the enlarged diameter portion 32 in the height direction Y becomes large. Also good. As shown in FIG. 7, the protruding members 35 are arranged at approximately equal intervals, for example, at about 3 to 8 locations in the circumferential direction W of the enlarged diameter portion 32.

  As shown in FIG. 8, the existing concrete column renewal method to which the present invention is applied cuts the existing concrete column 7 in a state where the electric wire 80 and the like supported by the existing concrete column 7 are temporarily received by the crane 81 and the like. Then, the electric wire 80 or the like is replaced with the enlarged pipe 3 having the same height as that of the existing concrete column 7, and the electric wire 80 or the like is supported by the enlarged pipe 3 serving as a new steel pipe column.

  The existing concrete column renewal method to which the present invention is applied is for updating the existing concrete column 7, and as shown in FIGS. 9 to 13, the existing concrete column 7 is cut to form the existing base 2. A cutting step, an installation step of providing the enlarged diameter tube 3 so as to cover the existing base portion 2, and a filling step of filling the time-curable material 4 inside the enlarged diameter portion 32 of the enlarged diameter tube 3.

  In the cutting process, first, as shown in FIG. 9, the existing concrete pillar 7 such as prestressed concrete that has been installed for a long time and deteriorated over time is cut at a predetermined position in the height direction Y from the ground surface 8a. The existing base 2 in which the protruding portion 21 protrudes from the ground surface 8a is formed.

  At this time, the existing base portion 2 has an inner hollow portion 20 formed in a substantially hollow shape, and an extension L1 in the height direction Y of the protruding portion 21 protruding from the ground surface 8a is an outer diameter D1 of the protruding portion 21. 1.5 times or more and 2.5 times or less, for example, about 2.0 times the outer diameter D1 of the protruding portion 21.

  In the cutting step, as shown in FIG. 10, when the reinforcing steel material 5 is provided in the inner space 20 of the existing base 2 as necessary, from the root portion 22 of the existing base 2 to the protruding portion 21 in the height direction Y. Continuously, as shown in FIG. 5, the reinforcing steel material 5 such as the steel pipe 50, the shaped steel 51, or the reinforcing bar 52 is inserted into the inner space 20 of the existing base 2.

  At this time, the reinforcing steel material 5 is a PC steel wire 70 disposed inside the existing concrete column 7 of prestressed concrete, and the existing tension disappears by cutting the existing concrete column 7. The steel pipe 50 etc. will be provided in the inner space part 20 of the existing base 2 as reinforcement substituted for the tension | tensile_strength which was done. Further, as shown in FIG. 10, the reinforcing steel material 5 is a lid such as a steel plate or a resin plate so as to close the inside and outside of the steel pipe 50 used as the reinforcing steel material 5 with the inner space 20 of the existing base 2. A member 20a is provided.

  Next, in the installation step, as shown in FIG. 11, the diameter-expanded portion 32 of the diameter-expanded tube 3 is covered from above the existing base portion 2, and the reduced diameter portion 31 of the diameter-expanded tube 3 is disposed above the existing base portion 2. Thus, the expanded diameter portion 32 of the expanded diameter tube 3 is installed on the ground surface 8 a and the expanded diameter tube 3 is provided so as to cover the existing base portion 2.

  At this time, the diameter-expanded tube 3 is a space S inside the diameter-expanded portion 32, and the boundary step portion 30 formed at the boundary between the diameter-reduced portion 31 and the diameter-expanded portion 32 moves the inner surface 30 a of the boundary step portion 30. In a state of being directed downward, it is arranged so as to protrude toward the inside of the enlarged diameter portion 32.

  Next, in the installation step, as shown in FIG. 12, when a plurality of protruding members 35 are provided on the enlarged diameter portion 32 of the enlarged diameter tube 3 as necessary, in the height direction Y of the enlarged diameter portion 32. Each projecting member 35 provided over a plurality of stages is tightened so that the projecting member 35 is moved from the inner surface 32a of the enlarged diameter portion 32 of the expanded diameter tube 3 toward the outer surface 21a of the projected portion 21 of the existing base 2. The tip part 35a is protruded.

  At this time, the projecting member 35 has different projecting lengths V at which the respective distal end portions 35a project from the inner surface 32a of the expanded diameter portion 32 of the expanded diameter tube 3 at the upper and lower stages in the height direction Y of the expanded diameter portion 32. By adjusting the distance between the inner surface 32a of the expanded diameter portion 32 of the expanded diameter tube 3 and the outer surface 21a of the protruding portion 21 of the existing base 2, the inclination angle θ of the expanded diameter tube 3 with respect to the ground surface 8a is made fine. It will be adjusted.

  In addition, as shown in FIG. 7, the protruding members 35 are protruding lengths at which the respective distal end portions 35 a protrude from the inner surface 32 a of the enlarged diameter portion 32 of the enlarged diameter tube 3 at a plurality of locations in the circumferential direction W of the enlarged diameter portion 32. By making V different, the distance between the inner surface 32a of the expanded diameter portion 32 of the expanded diameter tube 3 and the outer surface 21a of the protruding portion 21 of the existing base portion 2 is adjusted, and the horizontal diameter of the expanded diameter tube 3 with respect to the existing base portion 2 is adjusted. The position is finely adjusted.

  Next, in the filling step, as shown in FIG. 13, the time-curable material 4 having a high fluidity is passed through the through-hole 33 formed in the side surface of the diameter-expanded tube 3 and the space inside the diameter-expanded portion 32. The time-curable material 4 is injected into the space S inside the expanded portion 32 of the expanded tube 3 from the inner space 20 of the existing base 2 to at least the boundary step portion 30 of the expanded tube 3. Will be filled.

  At this time, the existing base 2 is provided such that the lid member 20a such as a steel plate or a resin plate closes the inner space 20 of the existing base 2 so that the downward movement of the time-curable material 4 is It is blocked by the lid member 20a and prevents the time-curable material 4 from flowing out from the lower end of the existing base 2 into the ground 8 so that the time-curable material 4 is sufficient in the inner space 20 of the existing base 2. Will be filled.

  Next, in the filling process, the anti-corrosion treatment such as installing a lid on the through-hole 33 is performed, and then the time-curable material 4 filled in the space S inside the enlarged diameter portion 32 is cured over a predetermined time. The time-curable material 4 that has been cured to become a consolidated material is brought into contact with the inner surface 30 a of the boundary step portion 30 of the diameter-expanded tube 3.

  In the filling process, as shown in FIGS. 14 and 15, the expanded diameter portion 32 of the expanded diameter tube 3 covered on the existing base portion 2 is expanded while being supported by the anchor member 60 or the support member 61 as necessary. The time-curable material 4 filled in the space S inside the diameter portion 32 may be cured.

  At this time, as shown in FIG. 14, the anchor member 60 is provided in the ground 8 by inserting a chemical anchor or the like through the rib portion 34 provided at a part of the lower end of the diameter expansion pipe 3. Furthermore, until the predetermined time elapses until the time-curable material 4 filled in the space S inside the enlarged diameter portion 32 is cured and exhibits a certain strength, the expanded diameter tube 3 may collapse. As a result, the expanded pipe 3 is supported.

  Further, the support member 61 is provided so as to extend from the enlarged diameter portion 32 of the enlarged diameter pipe 3 to the ground surface 8a as shown in FIG. 15 (a), or as shown in FIG. 15 (b). By extending from the expanded portion 32 of the diameter pipe 3 to the handrail 82 in the vicinity of the existing concrete column 7 or the like, mainly until the time-curable material 4 is cured and exhibits a certain strength, a predetermined strength is obtained. Until the time elapses, the expanded pipe 3 is supported so that the expanded pipe 3 does not collapse.

  The existing concrete column renewal method to which the present invention is applied uses the existing concrete column 7 to update the overhead line column, the distribution column, etc. economically without requiring a new site, It is possible to prevent the updated overhead poles, distribution poles, etc. from collapsing. In particular, in the existing concrete column renewal method to which the present invention is applied, in the filling step, the expanded diameter portion 32 of the expanded diameter pipe 3 covered on the existing base 2 is supported by the anchor member 60 or the support member 61 while expanding the diameter. An anchor member until a predetermined time elapses until the time-curable material 4 is cured and exhibits a certain strength by curing the time-curable material 4 filled in the space S inside the portion 32. It is possible to support the expansion pipe 3 by the support member 61 or the support member 61 and prevent the expansion pipe 3 from collapsing, and the like in the vicinity of an overhead pole etc. until a predetermined time elapses. Operation becomes possible.

  As shown in FIG. 16A, the composite column structure 1 to which the present invention is applied has a reduced diameter portion 31 in the height direction Y of the expanded tube 3 when the expanded tube 3 is installed as a new steel tube column. Therefore, the weight of the expanded diameter tube 3 acts as a substantially vertical load P toward the expanded diameter portion 32. At this time, in the composite column structure 1 to which the present invention is applied, the boundary step portion 30 is expanded at the boundary between the reduced diameter portion 31 and the enlarged diameter portion 32 with the inner surface 30a of the boundary step portion 30 facing downward. Since it is disposed so as to protrude toward the inside of the portion 32, the time-curable material 4 cured by contacting with the inner surface 30 a of the boundary step portion 30 is applied to the substantially vertical load P from the inner surface 30 a of the boundary step portion 30. The part is transmitted.

  The composite column structure 1 to which the present invention is applied is transmitted to the time-curable material 4 by transmitting a part of the substantially vertical load P from the inner surface 30a of the boundary step portion 30 to the time-curable material 4 cured. A part of the substantially vertical load P is further transmitted to the protruding part 21 of the existing base 2, and the shared load P1 as a part of the substantially vertical load P acts on the ground surface 8 a from the protruding part 21 of the existing base 2. It will be a thing. In the composite column structure 1 to which the present invention is applied, the remaining substantially vertical load P is applied to the expanded portion 32 of the expanded tube 3 except for a part of the approximately vertical load P transmitted to the time-curable material 4. As a result, the shared load P2 as the remaining portion of the substantially vertical load P acts on the ground surface 8a from the lower end of the enlarged diameter portion 32 of the enlarged diameter pipe 3.

  In the composite column structure 1 to which the present invention is applied, the substantially vertical load P such as its own weight of the diameter-expanded pipe 3 is divided between the projecting part 21 of the existing base 2 and the diameter-expanded part 32 of the diameter-expanded pipe 3. Since the load P2 is shared and acts on the ground surface 8a, the locally concentrated substantially vertical load P is not burdened on the ground surface 8a. As a result, the composite column structure 1 to which the present invention is applied does not cause the ground surface 8a to be subjected to the substantial vertical load P in a concentrated manner, so that the foundation provided on the ground surface 8a is damaged by the substantially vertical load P. By avoiding this, it becomes possible to prevent subsidence, collapse and the like due to the own weight and external force of the expanded pipe 3 installed as a new steel pipe column.

  On the other hand, as shown in FIG. 16B, the conventional reinforcing half steel pipe 9 has the same inner diameter D4 of the side wall 92 of the half steel pipe 93 from the upper part to the lower part in the height direction Y. Since it is formed in a straight shape, when the dead weight of the half steel pipe 93 acts as a substantially vertical load P, a part of the substantially vertical load P is not transmitted to the existing concrete column 91, and the substantially vertical load P All of them act directly on the ground surface 8 a from the side wall 92 of the half steel pipe 93. In the conventional half steel pipe for reinforcement 9, since almost all of the substantially vertical load P acts locally on the ground surface 8 a, the foundation provided on the ground surface 8 a is damaged by the substantially vertical load P. The existing concrete column 91 reinforced with the half steel pipe 93 may collapse.

  Further, the conventional reinforcing half steel pipe 9 needs to be provided with anchor bolts 95 inserted in the base plate 94 in the ground 8 in order to prevent the collapse of the existing concrete pillar 91 reinforced by the half steel pipe 93. Become. Further, the conventional reinforcing half steel pipe 9 is separated from the root portion 90 of the existing concrete column 91 in order to avoid the concentrated vertical load P and the supporting load acting in the horizontal direction from concentrating on the foundation. The anchor bolt 95 must be provided in the ground 8. For this reason, the conventional reinforcing half steel pipe 9 needs to be provided with an excessive base plate 94 in the half steel pipe 93, and it may be necessary to subject the anchor bolt 95 to a separate anticorrosion treatment. There was also a risk that the cost would increase. The conventional reinforcing half steel pipe 9 requires a reinforcing member such as a separate frame member for fixing the half steel pipe 93 in order to prevent the collapse of the existing concrete column 91 reinforced by the half steel pipe 93. In some cases, material costs and construction costs may increase.

  In the composite column structure 1 to which the present invention is applied, the diameter of the reduced diameter portion 31 in the newly-expanded expanded pipe 3 can be approximately the same as the diameter of the existing concrete column 7. It becomes possible to enlarge. Therefore, the composite column structure 1 to which the present invention is applied does not need to provide an excessive base plate 94 even when a large external force acts on a newly installed steel pipe column, and a reinforcing member such as a separate frame member is not required. It is possible to economically renew overhead poles, distribution poles, etc. in a short period of time using existing concrete pillars 7 without having to provide them. In the composite column structure 1 to which the present invention is applied, since the boundary step portion 30 is formed at the boundary between the reduced diameter portion 31 and the enlarged diameter portion 32, the cured time-curable material 4 is in the height direction at the boundary step portion 30. Therefore, the diameter-expanded tube 3 and the time-curable material 4 can be reliably integrated with each other without necessarily providing a stopper in the height direction Y.

  In the composite column structure 1 to which the present invention is applied, the reduced diameter portion 31 disposed above the existing base portion 2 is separated from the central axis of the existing base portion 2 by a predetermined distance R1, so that the conventional reinforcing half steel tube 9 is reinforced. The distance R1 at which the reduced diameter portion 31 is separated is smaller than the distance R2 from the central axis of the existing concrete pillar 91 to the side wall 92 in FIG. As a result, the composite column structure 1 to which the present invention is applied is obtained from the expanded pipe 3 having the reduced diameter portion 31 to the ground surface rather than the bending moment M2 acting on the ground surface 8a from the half steel pipe 93 formed in a straight shape. Since the bending moment M1 acting on 8a is smaller, it is possible to prevent deformation of the diameter-expanded pipe 3 and damage to the foundation provided on the ground surface 8a.

  In the composite column structure 1 to which the present invention is applied, the protruding portion 21 of the existing base portion 2 and the enlarged diameter portion 32 of the enlarged diameter tube 3 are provided so as to overlap in the height direction Y within a predetermined extension L1. The horizontal load Q and the bending moment M acting on the diameter expansion pipe 3 are transmitted from the diameter expansion section 32 of the diameter expansion pipe 3 to the protruding portion 21 of the existing base section 2, so that the existing base section 2 of the existing concrete column 7 is By utilizing this, it becomes possible to prevent collapse or the like due to the horizontal load Q and the bending moment M of the expanded pipe 3 installed as a new steel pipe column. The pressure H1 is a load acting in the horizontal direction on the upper side of the enlarged diameter portion 32, and the pressure H2 is a load acting in the horizontal direction on the lower side of the enlarged diameter portion 32. Furthermore, the composite column structure 1 to which the present invention is applied has a new steel pipe column with a lower weight than the existing concrete column 7, so that it is possible to improve the earthquake resistance of the updated overhead column, distribution column, etc. It becomes.

  In the composite column structure 1 to which the present invention is applied, the diameter-expanded tube 3 is provided so as to cover the existing base 2, so that the time-curable material 4 filled in the inner space 20 of the existing base 2 or the existing base 2 PC steel wire 70 or the like disposed inside is not exposed to the outside, avoiding the formation of a water channel in the time-curable material 4 in the inner space 20 of the existing base 2, and PC By suppressing the progress of the corrosion of the steel wire 70, it is possible to prevent the existing base 2 of the existing concrete column 7 from corroding and prevent the expansion pipe 3 from collapsing using the existing concrete column 7. It becomes.

  As shown in FIG. 5, the composite column structure 1 to which the present invention is applied is formed by inserting the reinforcing steel material 5 into the inner space 20 of the existing base 2, and cutting the existing concrete column 7 to thereby remove the existing prestressed concrete. Even if the tension of the PC steel wire 70 disposed inside the concrete column 7 disappears, the reinforcing steel material 5 provided in the inner space 20 of the existing base 2 replaces the tension of the PC steel wire 70. This makes it possible to achieve reinforcement.

  As shown in FIGS. 5A and 5B, the composite column structure 1 to which the present invention is applied has a steel pipe 50 or a shaped steel 51 inserted into the inner space 20 of the existing base 2, thereby reinforcing the steel material 5. It is possible to secure the continuity of the structure in the height direction Y and firmly reinforce the existing base 2, and in particular, as shown in FIG. 5 (b), it is formed in the inner space 20 of the existing base 2. When the steel 51 is inserted, it is possible to realize intensive reinforcement in a specific plane direction. As shown in FIG. 5C, the composite column structure 1 to which the present invention is applied suppresses an increase in the material cost of the reinforcing steel material 5 when the reinforcing bar 52 is inserted through the inner space 20 of the existing base 2. Is possible. As shown in FIG. 4, the composite column structure 1 to which the present invention is applied is such that the upper end 5 a of the reinforcing steel material 5 protrudes upward from the inner space 20 of the existing base 2, thereby curing the time-curable material 4. Thus, the reinforcing steel material 5 and the expanded pipe 3 can be firmly integrated.

  As shown in FIG. 12, the composite column structure 1 to which the present invention is applied is provided with a plurality of projecting members 35 that project from the inner surface 32 a of the enlarged diameter portion 32 toward the outer surface 21 a of the projecting portion 21 of the existing base 2. Then, the inclination length θ of the enlarged diameter tube 3 with respect to the ground surface 8a is finely adjusted by changing the projection length V of the projecting member 35 at the upper and lower stages in the height direction Y of the enlarged diameter portion 32, and FIG. As shown in FIG. 3, the protruding length V of the protruding member 35 is varied at each location in the circumferential direction W of the enlarged diameter portion 32, and the horizontal position of the enlarged diameter tube 3 with respect to the existing base portion 2 is finely adjusted. In addition, it is possible to economically update distribution poles and the like in a short period of time.

  The composite column structure 1 to which the present invention is applied is provided with a projecting member 35 projecting from the inner surface 32a of the enlarged diameter portion 32 toward the outer surface 21a of the projecting portion 21 of the existing base portion 2, thereby curing the time-curable material 4. Is secured in the height direction Y by the projecting member 35, and the diameter-expanding tube 3 and the time-curable material 4 can be reliably integrated without necessarily providing a stopper in the height direction Y or the like. As a structure, it is possible to ensure a larger bending strength and vertical strength. For the purpose of further enhancing the slip prevention effect, as shown in FIG. 14, it is a design variation to provide a diaphragm 40 and the like on the inside of the diameter-expanded tube 3 and above the time-curable material 4. is there.

  In the composite column structure 1 to which the present invention is applied, as shown in FIG. 3, the diameter-expanded tube 3 provided so as to cover the existing base part 2 has a straight-shaped diameter-expanded part 32 extending straight in a substantially vertical direction. However, the present invention is not limited to this, and as illustrated in FIG. 17, the taper-shaped enlarged-diameter portion 32 that extends in an inclined manner in the height direction Y may be provided. In the composite pillar structure 1 to which the present invention is applied, the diameter-expanded pipe 3 having the straight-shaped diameter-expanded portion 32 is used, so that the diameter-expanded pipe 3 can be provided close to the existing concrete pillar 7. Moreover, since the diameter-expanded pipe 3 having the tapered diameter-increased portion 32 is used, the load transmission bearing area in the vertical direction between the diameter-expanded pipe 3, the existing base 2, and the time-curable material 4 increases. The vertical proof stress of the expanded pipe 3 can be improved.

  In the composite column structure 1 to which the present invention is applied, the existing base 2 and the temporally curable material 4 are covered with the enlarged diameter portion 32 even when the updated overhead pole, power distribution column, etc. are installed for a longer period of time. Since the aging deterioration of the existing base 2 and the time-curable material 4 is suppressed and only the diameter-expanded tube 3 and the surface-time-curable material 4 are to be updated, the overhead wire is installed for a long time. It is possible to easily update the pillars, distribution poles, etc. again.

  As mentioned above, although the example of embodiment of this invention was demonstrated in detail, all the embodiment mentioned above showed only the example of actualization in implementing this invention, These are the technical aspects of this invention. The scope should not be construed as limiting.

DESCRIPTION OF SYMBOLS 1: Compound pillar structure 2: Existing base part 20: Inner space part 20a: Lid member 21: Protrusion part 21a: Outer surface 22 of protrusion part: Deepening part 3: Expanding pipe 30: Boundary step part 30a: Inner surface 31 of boundary step part : Diameter reduction part 32: Diameter expansion part 32a: Inner surface 33 of diameter expansion part: Through hole 34: Rib part 35: Projection member 35a: Tip part 4: Temporarily curable material 40: Diaphragm 5: Reinforced steel material 5a: Reinforced steel material Upper end 50: Steel pipe 51: Shaped steel 52: Reinforcing bar 52a: Hoop bar 60: Anchor member 61: Support member 7: Concrete column 7a: Lower end 7b: Upper end 70: PC steel wire 8: In the ground 8a: Ground surface 80: Electric wire 81: crane 82: rail X: width direction Y: height direction

Claims (8)

A composite column structure for renewing existing concrete columns,
An existing base projecting from the ground surface, and a diameter expansion pipe provided to cover the existing base,
The existing base is formed by cutting an existing concrete pillar,
The diameter-expanding pipe includes a diameter-reduced portion disposed above the existing base, a diameter-increased portion having a larger inner diameter than the diameter-reduced portion and spaced from the outer diameter of the existing base by a predetermined distance, and the diameter-reduced portion A boundary step portion having an inner diameter increased from an inner diameter of the reduced diameter portion to an inner diameter of the enlarged diameter portion at a boundary between the portion and the enlarged diameter portion, and the enlarged diameter covered on the existing base portion The inside and inside of the boundary stepped portion are filled with a time-curable material until the entire inner surface of the boundary stepped portion comes into contact ,
The composite column structure characterized in that the boundary step portion is disposed so as to protrude toward the inside of the enlarged diameter portion in a state where the inner surface of the boundary step portion faces the existing base portion. The existing base is formed by cutting an existing concrete pillar at a position that is 1.5 times or more the outer diameter of the existing base in the height direction from the ground surface. Composite pillar structure. The composite pillar structure according to claim 1 or 2, wherein the existing base has an inner space formed in a substantially hollow shape, and a reinforcing steel material is inserted into the inner space. The composite column structure according to claim 3, wherein the reinforcing steel material is a steel pipe, a shape steel, or a reinforcing bar. 5. The composite pillar structure according to claim 1, wherein the diameter expansion pipe is provided with a plurality of projecting members that project from an inner surface of the diameter expansion portion toward an outer surface of the existing base portion. . 6. The composite pillar structure according to claim 1, wherein an inner diameter of the reduced diameter portion is smaller than an outer diameter of a protruding portion protruding from a ground surface of the existing base portion. An existing concrete column renewal method for renewing an existing concrete column,
A cutting step of cutting an existing concrete pillar at a predetermined position in a height direction from the ground surface to form an existing base protruding from the ground surface, a reduced diameter portion disposed above the existing base, and the reduced diameter An enlarged diameter portion that is larger than the outer diameter and spaced apart from the outer diameter of the existing base by a predetermined distance , and a boundary between the reduced diameter portion and the enlarged diameter portion, and from the inner diameter of the reduced diameter portion to the enlarged diameter portion. A diameter-expanding pipe having a boundary step portion with an increased inner diameter up to an inner diameter is protruded toward the inside of the diameter-expanded portion with the inner surface of the boundary step portion facing the existing base portion. An installation step for covering the base portion, and a filling step for filling the inside of the enlarged diameter portion and the boundary step portion covered with the existing base portion until a time-curable material contacts the entire inner surface of the boundary step portion. An existing concrete pillar renewal method characterized by comprising . In the filling step, the time-curable material filled inside the enlarged diameter portion is cured while the enlarged diameter portion covered on the existing base portion is supported by an anchor member or a support member. The existing concrete pillar renewal construction method of Claim 7.

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