JP2012207410A - Connection structure for column member, and construction method for tower-like structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection structure for a column member, which enables simplified adjustment of angle shift, and a construction method for a tower-like structure.SOLUTION: A tower-like structure is constructed by a connection structure 1 for a column member, in which upper and lower column members 10 and 20 butting against each other in a vertical direction are joined together. A level adjusting plate 30 is interposed between butt surfaces of the upper and lower column members 10 and 20, a top surface of the level adjusting plate 30 assumes horizontality in a state in which the level adjusting plate 30 is placed on the upper end surface of the lower-side column member 20, and the level adjusting plate 30 has a planar shape capable of abutting on the whole butt surfaces of the upper and lower column members 10 and 20.

Description

  The present invention relates to a column member connection structure and a tower structure construction method.

  There is a case where a tower-like structure is constructed by connecting a plurality of column members in a vertical direction such as a radio tower for installing an antenna.

  As shown in FIG. 4, such a connecting portion between the column members is formed by overlapping a circular flange 120 integrally formed at the end of the column member 110 with the flange 120 of the other column member 110 adjacent vertically. In a combined state, it is generally performed by fastening with bolts B, B,... Inserted through both flanges 120, 120 (see, for example, Patent Document 1).

JP 2008-13951 A

However, since the conventional column member connection structure does not have a function of adjusting the accuracy of the column member 110, it is necessary to manufacture and construct the column member 110 with high accuracy.
On the other hand, it is generally said that there is a possibility that an error of about 1/300 may occur in the manufacture of the column member by centrifugal molding.

  The present invention has been made to solve such problems, and provides a column member connection structure and a method for constructing a tower-like structure, which can easily adjust the construction accuracy. Let it be an issue.

  In order to solve the above-mentioned problem, the column member connection structure according to the present invention is a column member connection structure that connects column members that are butted in the vertical direction, and the level adjustment is performed on the butting surfaces of the column members. A plate is interposed, and the level adjusting plate is placed on the upper end surface of the lower column member, and the upper surface is horizontal, and the entire abutting surface of the column member can abut. It is characterized by having a flat shape.

According to such a column member connection structure, when the column members are brought into contact with each other, even if there is an angle shift due to manufacturing accuracy or construction method accuracy, the angle shift is adjusted by the level adjustment plate, and high accuracy is achieved. Can be constructed.
Since the level adjustment plate is in contact with the butting surface of the column member with almost no gap, the level adjustment plate is highly reliable.

  The column member connection structure includes an upper steel pipe provided at a lower end portion of an upper column member and a lower steel pipe provided at an upper end portion of a lower column member, and is provided on an outer surface of the upper steel pipe. A plurality of upper gusset plates extending along the vertical direction are provided at intervals in the circumferential direction, and a plurality of lower gusset plates extending along the vertical direction are provided around the outer surface of the lower steel pipe. The upper gusset plate and the lower gusset plate that are provided at intervals in the direction and are vertically adjacent to each other may be held by a pair of splice plates.

According to such a column member connection structure, the column members are joined in the axial direction by friction-joining the gusset plate and the splice plate to each member (gusset plate, splice plate, bolt, etc.) in the connection portion. Therefore, the amount of steel can be reduced as compared with the conventional connection structure using flanges.
Further, since the gusset plate and the splice plate extend in the vertical direction, it does not hinder the installation of the long object disposed along the axial direction.

  The tower-like structure construction method of the present invention includes a first step of standing a lower column member, a second step of disposing a level adjustment plate on the upper end surface of the lower column member, A third step of disposing an upper column member on the upper surface of the level adjustment plate and connecting the upper column member to the lower column member, and a method for constructing a tower-like structure, comprising: The adjustment plate has a planar shape in which one surface is inclined with respect to the other surface and the entire end surface of the column member can contact, and in the second step, the level adjustment plate is It is characterized in that the upper surface of the level adjustment plate is made horizontal by rotating on the upper end surface of the lower column member.

  According to such a construction method of the tower-like structure, even if the lower column member has a deviation in construction accuracy, the deviation is easily adjusted by the level adjustment plate, and the construction of the upper column member is highly accurate. Can be done.

  According to the column member connection structure and the tower-like structure construction method of the present invention, the building accuracy of the tower-like structure can be easily adjusted.

(A) is a side view which shows the connection structure of the pillar member which concerns on embodiment, (b) is X1-X1 sectional drawing of (a). It is a figure which shows a level adjustment plate, Comprising: (a) is a top view, (b) is a side view, (c) And (d) is a modification of (b). (A)-(c) is a side view which shows each construction step of the construction method of a tower-like structure. (A) is a side view which shows the connection structure of the conventional pillar member, (b) is X2-X2 sectional drawing of (a).

As shown in FIG. 1A, the column member connection structure 1 according to the present embodiment includes an upper column member (hereinafter simply referred to as an “upper column member”) 10 and a lower side that are abutted in the vertical direction. These column members (hereinafter simply referred to as “lower column members”) 20 are joined.
The upper column member 10 and the lower column member 20 are connected via a connecting member 40 in a state where the level adjustment plate 30 is interposed on the abutting surface.

  As shown in FIGS. 1A and 1B, the upper column member 10 is a columnar precast member that includes a main body 11 that is a concrete portion and an upper steel pipe 12.

A hollow portion 13 penetrating in the axial direction is formed at the center of the main body portion 11. In addition, the hollow part 13 does not necessarily need to be formed.
The configuration of the main body 11 is not limited, and may be, for example, reinforced concrete or prestressed concrete.

An upper steel pipe 12 is disposed at the lower end of the upper column member 10 (main body portion 11).
The upper steel pipe 12 is disposed so as to cover the outer periphery of the lower end portion of the main body portion 11. The upper steel pipe 12 has a circular cross section and has an outer diameter that is the same as the outer diameter of the main body 11. The lower end portion of the main body 11 is reduced in diameter, and this reduced diameter portion is inserted into the upper steel pipe 12.

  A plurality (four in this embodiment) of upper gusset plates 14, 14,... Extending along the vertical direction (axial direction) are provided on the outer surface of the upper steel pipe 12. The plurality of upper gusset plates 14, 14,... Are arranged at equal intervals in the circumferential direction.

  The upper gusset plate 14 is made of a steel plate in which a plurality of bolt holes 14a, 14a,... (See FIG. 3C) are formed, and is welded to the outer surface of the upper steel pipe 12. In addition, the formation method of the upper gusset plate 14 is not limited, For example, you may form integrally with the upper steel pipe 12 by extrusion molding etc.

  The bolt hole 14a has an inner diameter larger than the bolt diameter of the bolt B described later, and the bolt B is inserted even if the upper gusset plate 14 is inclined with respect to the connecting member 40 by adjusting the angle. It can be done. The bolt hole 14a may be a long hole.

  The number and arrangement of the upper gusset plates 14 are not limited, and may be appropriately increased or decreased according to the required design rigidity and design strength. Further, the thickness of the upper gusset plate 14 and the number of bolt holes 14a may be set as appropriate.

  As shown in FIG. 1, the lower pillar member 20 is a columnar precast member configured to include a main body portion 21 that is a concrete portion and a lower steel pipe 22.

A hollow portion 23 penetrating in the axial direction is formed in the central portion of the main body portion 21. The hollow portion 23 is not necessarily formed.
The configuration of the main body 21 is not limited, and may be, for example, reinforced concrete or prestressed concrete.

A lower steel pipe 22 is disposed at the upper end of the lower column member 20 (main body portion 21).
The lower steel pipe 22 is disposed so as to cover the outer periphery of the upper end portion of the main body portion 21. The lower steel pipe 22 has a circular cross section, and the outer diameter is the same as the outer diameter of the main body portion 21. The lower end portion of the main body portion 21 is reduced in diameter, and the reduced diameter portion is inserted into the lower steel pipe 22.

  A plurality (four in this embodiment) of lower gusset plates 24, 24,... Extending along the vertical direction (axial direction) are provided on the outer surface of the lower steel pipe 22. The plurality of lower gusset plates 24, 24,... Are arranged at equal intervals in the circumferential direction.

  The lower gusset plate 24 is a steel plate in which a plurality of bolt holes 24a, 24a,... (See FIG. 3A) are formed, and is welded to the outer surface of the lower steel pipe 22. In addition, the formation method of the lower gusset plate 24 is not limited, For example, you may form integrally with the upper steel pipe 22 by extrusion molding etc.

  The bolt hole 24a has an inner diameter larger than the bolt diameter of the bolt B described later, and the bolt B is inserted even if the lower gusset plate 24 is inclined with respect to the connecting member 40 by adjusting the angle. It can be done. The bolt hole 24a may be a long hole.

  The number and arrangement of the lower gusset plates 24 are set according to the upper gusset plate 14. That is, the number of the lower gusset plates 24 is the same as that of the upper gusset plates 14 and is arranged at equal intervals in the circumferential direction. Further, the thickness of the lower gusset plate 24, the number of bolt holes 24a, and the like may be set as appropriate.

The upper column member and the lower column member (hereinafter may be simply referred to as “column members 10 and 20”) are formed by centrifugal molding.
The column members 10 and 20 are formed by setting the upper steel pipe 12 to which the upper gusset plate 14 is fixed to one end of the mold, and the lower steel pipe 22 to which the lower gusset plate 24 is fixed to the other end of the mold. After setting and performing predetermined bar arrangement, concrete is placed in the mold and centrifugally formed. The column members 10 and 20 are not necessarily provided with both the upper steel pipe 12 and the lower steel pipe 22.

As shown in FIG. 2A, the level adjustment plate 30 is a steel plate having a predetermined thickness, so that the entire abutting surfaces of the column members 10 and 20 can come into contact with each other. It has a planar shape (circular) equivalent to 20 external shapes.
In the present embodiment, a through hole 31 having the same shape as the hollow portions 13 and 23 of the column members 10 and 20 is formed in the center portion of the level adjustment plate 30.

As shown in FIGS. 2B to 2D, the level adjustment plate 30 has a thickness so that the upper surface of the level adjustment plate 30 is horizontal when placed on the upper end surface of the lower column member 20. (T ₁ to t ₃ ) is adjusted. That is, as the level adjustment plate 30, the upper and lower surfaces are parallel (see (a) in FIG. 2), and one of the upper and lower surfaces (the surface on the lower column member 20 side in FIG. 2) is the other surface. The one (see (c) and (d) of FIG. 2) that is inclined with respect to (the surface on the upper column member 10 side in FIG. 2) is used.

  In the present embodiment, the lifting holes 32, 32, 32 are formed in the level adjustment plate 30 so as to be able to be suspended during construction. Note that the locking hole 32 may be formed as necessary, and is not necessarily formed.

  As shown in FIGS. 1A and 1B, the connecting member 40 includes a pair of splice plates 41 and 41 that hold the upper gusset plate 14 and the lower gusset plate 24 that are vertically adjacent to each other.

  The splice plate 41 is a steel plate in which a plurality of bolt holes (not shown) are formed according to the positions of the bolt holes 14a, 24a of the gusset plates 14, 24.

  The pair of splice plates 41 connects the upper and lower column members 10 and 20 by being fastened with bolts B with the upper and lower adjacent gusset plates 14 and 24 sandwiched therebetween. That is, the upper half of the splice plate 41 is applied to the upper gusset plate 14, and the lower half of the splice plate 41 is applied to the lower gusset plate 24.

  Hereinafter, the construction method of the tower-like structure of the present embodiment will be described.

In the construction method of the tower-like structure, first, as shown in FIG. 3A, the lower column member 20 is erected on the upper end surface of a foundation (not shown) or an existing column member (first step).
The lower column member 20 is erected so that the column axis is as vertical as possible.

Next, as shown in FIG. 3B, the level adjusting plate 30 is disposed on the upper end surface of the standing lower column member 20 (second step).
In this embodiment, a plurality of types of level adjustment plates 30, 30,... With different inclination angles (including 0 °) of the lower surface with respect to the upper surface are manufactured in advance.

First, the level etc. of the upper end surface of the lower column member 20 are measured, and a level adjustment plate 30 corresponding to the construction accuracy of the lower column member 20 is selected from the plurality of level adjustment plates 30, and this level adjustment plate 30 is arranged on the upper surface of the lower column member 20.
That is, as shown in FIG. 3A, when the upper end surface of the lower column member 20 is inclined with respect to the horizontal line HL due to the manufacturing accuracy and the construction accuracy of the lower column member 20, A level adjustment plate 30 (one of (c) or (d) of FIG. 2) whose one surface is inclined with respect to the other surface is selected and arranged. On the other hand, when the upper end surface of the lower column member 20 is substantially parallel to the horizontal line HL, a level adjustment plate 30 (see FIG. 2B) having an upper surface and a lower surface formed in parallel may be disposed.

  When the level adjustment plate 30 is disposed on the upper surface of the lower column member 20, as shown in FIG. 3B, the level adjustment plate 30 is placed on the lower column member so that the upper surface of the level adjustment plate 30 is parallel to the horizontal line HL. Rotate around 20 axes.

Next, as shown in FIG. 3C, the upper column member 10 is erected on the upper surface of the level adjustment plate 30 that exhibits a horizontal plane (third step).
When the upper column member 10 is disposed on the upper surface of the level adjustment plate 30, the upper and lower adjacent gusset plates 14 and 24 are sandwiched between the pair of splice plates 41 and 41, and the bolts B, B,. Thus, the upper column member 10 and the lower column member 20 are connected (see FIG. 1A).

  Thereafter, a tower-like structure having a desired height is constructed by repeating the second step and the third step.

  According to the column member joining structure of this embodiment, even if the lower column member is inclined due to manufacturing accuracy or construction accuracy, the inclination can be canceled out by the level adjustment plate 30, so that the tower-like structure is of high quality. You can build things.

  Since the level adjustment plate 30 is in almost full contact with the upper and lower column members 10 and 20 without forming a gap, an axial force is transmitted between the upper and lower column members 10 and 20. In addition, there is a low possibility that deformation or looseness occurs in the joint, and a highly reliable joint structure can be constructed.

  By rotating the level adjustment plate 30 on the upper surface of the lower column member 20, angle adjustment (error correction) can be easily performed.

  Further, since the gusset plates 14 and 24 formed along the vertical direction are joined by being gripped by the splice plates 41 and 41, a long object (for example, a ladder or the like) in which the joint portion is arranged along the vertical direction is used. There is no hindrance to the installation of electric wires.

Since the upper pillar member 10 and the lower pillar member 20 are joined by friction joining with the splice plates 41, 41, the stress is partially prevented from being concentrated, and the reliability is high.
Moreover, since the bending strength is ensured by the upper and lower gusset plates 14 and 24 and the pair of splice plates 41 and 41, a high-performance tower structure is constructed.

Since it is dry-type joining by bolt joining, the next work process can be carried out if the tightening of the bolt is completed without waiting for hardening of the filler or the like, and the workability is excellent.
Moreover, since it constructs | assembles combining an existing member, it is excellent in workability.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and it goes without saying that the above-described constituent elements can be appropriately changed without departing from the spirit of the present invention.

The shape (planar shape and thickness) of the level adjustment plate is not limited, and may be appropriately formed according to the shape of the column member.
The level adjustment plate may be fixed to the upper column member or the lower column member.

The joining of the column members is not limited to the one using a gusset plate and a splice plate.
Further, a cover member that covers the upper steel pipe and the lower steel pipe may be disposed, or the cover member may be formed integrally with the splice plate.

DESCRIPTION OF SYMBOLS 1 Connection structure of pillar member 10 Upper pillar member 11 Upper steel pipe 12 Upper gusset plate 20 Lower pillar member 21 Lower steel pipe 22 Lower gusset plate 30 Level adjustment plate 40 Connecting member 41 Splice plate

Claims (3)

A column member connection structure for joining column members that are faced in the vertical direction,
A level adjustment plate is interposed on the butting surface between the column members,
The level adjustment plate has a planar shape in which the upper surface is horizontal in a state where the level adjustment plate is placed on the upper end surface of the lower column member, and the entire abutting surface of the column member can come into contact therewith. A connecting structure for a pillar member, characterized in that An upper steel pipe provided at the lower end of the upper column member;
A lower steel pipe provided at the upper end of the lower column member,
On the outer surface of the upper steel pipe, a plurality of upper gusset plates extending along the vertical direction are provided at intervals in the circumferential direction,
On the outer surface of the lower steel pipe, a plurality of lower gusset plates extending along the vertical direction are provided at intervals in the circumferential direction,
The column member joining structure according to claim 1, wherein the upper and lower adjacent gusset plates and the lower gusset plate are gripped by a pair of splice plates. A first step of erecting the lower column member;
A second step of disposing a level adjustment plate on the upper end surface of the lower column member;
A third step of disposing an upper column member on the upper surface of the level adjustment plate and connecting the upper column member to the lower column member, and a building method of a tower-like structure comprising:
The level adjustment plate has a planar shape in which one surface is inclined with respect to the other surface and the entire end surface of the column member can abut,
In the second step, the level adjustment plate is rotated on the upper end surface of the lower column member to make the upper surface of the level adjustment plate horizontal, thereby constructing a tower-like structure Method.

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