JP2009243169A - Column base structure and its installation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a column base structure which can facilitate its installation work and which can enhance construction efficiency by increasing the degree of freedom of its work sequence, and an installation method therefor. <P>SOLUTION: This column base structure 2, in which an intermediary connecting member 8 and an end 10a of a main reinforcement 10 are connected together in foundation concrete 6, is characterized as follows: a steel column 4 is inserted into a central opening 8a which is formed in the intermediary connecting member 8; and grout materials 6 and 24 are infilled into a space between an outer peripheral portion of the steel column 4 and the central opening 8a of the intermediary connecting member 8. Its installation work can be easily performed, and the construction efficiency can be enhanced by increasing the degree of freedom of its work sequence. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention provides a column base structure in which transmission of force between a lower end portion of a steel column embedded in a foundation concrete in a building structure and a main reinforcing bar in the foundation concrete is performed via an intermediate connecting member, and It relates to the installation method.

As a conventional column base structure, for example, as described in Patent Document 1, it is plate-shaped, and a lower end portion of a steel column of a building structure is fitted in an opening formed inside (center side) thereof. In addition, an intermediate connecting member fixed to the lower end portion of the steel column is provided, and the main reinforcing bar is connected to the intermediate connecting member, so that the lower end portion of the steel column is connected via the intermediate connecting member. There was a column base structure in which main reinforcing bars were connected.
Japanese Patent No. 4033340

  However, in the conventional column base structure, the lower end portion of the steel column and the main reinforcing bar in the foundation concrete are connected via an intermediate connecting member, and the lower end portion of the steel column and the intermediate connecting member are welded. It was a structure fixed by. For this reason, there is a problem that fixing work by welding between the lower end portion of the steel column and the intermediate connecting member is not easy because skill is required.

  In addition, in the above conventional column base structure, it is not possible to perform reinforcement work such as main reinforcement and subsequent placement work of foundation concrete unless the steel column and the intermediate connecting member are installed. The degree of freedom in the procedure was low. As a result, there is a problem that the construction efficiency of the column base structure is lowered and the construction period may be prolonged.

  Therefore, in view of the above problems, the present invention provides a column base structure and an installation method thereof that can facilitate the installation work and increase the degree of freedom of the work procedure to improve the construction efficiency. The issue is to provide.

In order to solve the above problems, the column base structure according to the present invention is:
A column base structure in which the intermediate connecting member and the end of the main reinforcing bar are connected in the foundation concrete,
A steel column is inserted into the central opening formed in the mediating connecting member,
A grout material is filled in a space between the outer peripheral portion of the steel column and the inner peripheral surface of the central opening of the mediation connecting member.

The column base structure according to the present invention is
A formwork member having a height substantially the same as the height from the discarded concrete to the upper surface of the foundation concrete is provided on the intermediate connection member side of the space.

The column base structure according to the present invention is
The mold member is provided so as to sandwich the mediation connecting member from above and below.

The column base structure according to the present invention is
An L-shaped member having an L-shaped horizontal cross section is installed outside the mold member.

The column base structure according to the present invention is
A hooking hole penetrating in the vertical direction is formed in the mediation connecting member,
The bent portion provided at the end portion of the main reinforcing bar is inserted into the hooking hole, so that the end portion of the main reinforcing bar is hooked to the intermediate connecting member. is there.

Further, in order to solve the above problems, the present invention
A method of installing a column base structure in which the intermediate connecting member and the end of the main reinforcing bar are connected in the foundation concrete,
Installation work of a steel column that is constructed by inserting a steel column through a space in the central opening formed in the mediating connecting member,
The intermediary connecting member and the end portion of the main reinforcing bar are connected to each other and the bar arrangement work performed can be performed individually.

Moreover, the installation method of the column base structure according to the present invention is as follows.
Before placing the concrete foundation, on the intermediate connecting member side of the space, a formwork member having a height substantially equal to the height from the discarded concrete to the top surface of the foundation concrete is installed,
The grout material is filled in the space between the steel column and the formwork member before or after the foundation concrete is placed.

Moreover, the installation method of the column base structure according to the present invention is as follows.
All or part of the formwork member is removed after placing and solidifying the basic concrete and before filling the grout material.

According to such a column base structure of the present invention,
A column base structure in which the intermediate connecting member and the end of the main reinforcing bar are connected in the foundation concrete,
A steel column is inserted into the central opening formed in the mediating connecting member,
By filling the grout material in the space between the outer peripheral part of the steel column and the inner peripheral surface of the central opening of the mediation connecting member,
The installation work of the column base structure can be facilitated, and the construction efficiency can be improved by increasing the degree of freedom of the work procedure.

Moreover, according to the column base structure of the present invention,
By providing a formwork member having a height substantially the same as the height from the abandoned concrete to the upper surface of the foundation concrete on the mediating connecting member side of the space,
The installation work of the column base structure can be facilitated, and the degree of freedom of the work procedure can be further increased to improve the construction efficiency.

Moreover, according to the column base structure of the present invention,
By providing the formwork member so as to sandwich the mediation connecting member from above and below,
The above-mentioned formwork member can be reduced in size to facilitate its carrying work.

Moreover, according to the column base structure of the present invention,
By installing an L-shaped member having an L-shaped horizontal cross section outside the formwork member,
The installation work of the said formwork member etc. can be ensured.

Moreover, according to the column base structure of the present invention,
A hooking hole penetrating in the vertical direction is formed in the mediation connecting member,
By bending the bent portion provided at the end of the main reinforcing bar into the hooking hole, the end of the main reinforcing bar is hooked to the mediating connecting member.
The intermediary connecting member and the end of the main reinforcing bar can be easily connected.

Moreover, according to the installation method of the column base structure of the present invention,
A method of installing a column base structure in which the intermediate connecting member and the end of the main reinforcing bar are connected in the foundation concrete,
Installation work of a steel column that is constructed by inserting a steel column through a space in the central opening formed in the mediating connecting member,
By allowing the intermediary connecting member and the end portion of the main reinforcing bar to be connected and constructed to be performed individually,
The installation work of the column base structure can be facilitated, and the construction efficiency can be improved by increasing the degree of freedom of the work procedure.

Moreover, according to the installation method of the column base structure of the present invention,
Before placing the concrete foundation, on the intermediate connecting member side of the space, a formwork member having a height substantially equal to the height from the discarded concrete to the top surface of the foundation concrete is installed,
Before or after foundation concrete placing, by filling the space between the steel column and the formwork member with grout material,
The installation work of the column base structure can be facilitated, and the degree of freedom of the work procedure can be further increased to improve the construction efficiency.

Moreover, according to the installation method of the column base structure of the present invention,
By removing all or a part of the formwork member after the foundation concrete is placed and solidified and before filling with the grout material,
The formwork member can be reused, and the joint between the foundation concrete and the grout material can be made inconspicuous after enforcement.
In addition, when the formwork member is removed after the foundation concrete is placed, unevenness is generated on the surface of the foundation concrete from which the formwork member has been removed, and this kind of unevenness improves the transmission of force in the vertical direction. There are advantages.

Hereinafter, the best mode for carrying out the column base structure and its installation method according to the present invention will be specifically described with reference to the drawings.
FIG.1 and FIG.2 is a figure referred in order to demonstrate the column base structure 2 which concerns on the 1st Embodiment of this invention.

  As shown in FIGS. 1 and 2, the column base structure 2 according to the present embodiment has two frame-shaped (endless) intermediate connection members 8 arranged in the foundation concrete 6 so as to be separated from each other in the vertical direction. It has. As will be described later, each of the upper and lower two intermediate connecting members 8 exerts a force between the lower end portion 4a of the steel column 4 embedded in the foundation concrete 6 and the main reinforcing bar 10 in the foundation concrete 6 as described later. Can be communicated.

  In the basic concrete 6, eight main reinforcing bars 10 are arranged on each of the left and right sides of the lower end 4 a of the steel column 4, divided into upper and lower parts, four in total. The four main reinforcing bars 10 above and below are arranged in parallel to each other (equally spaced from each other in the horizontal direction).

  Each of the total eight main reinforcing bars 10 is formed with a screw on the outer periphery of its end portion 10a and is fastened to a female screw 8b (described later) of the intermediate connecting member 8.

  In addition, each of the eight main reinforcing bars 10 has a staggered bar 12 arranged from the outside in a direction orthogonal to the eight main reinforcing bars 10 so as to surround the main reinforcing bar 10 in a rectangular endless manner. (Shear reinforcement) is attached. Due to the stirrups 12, the relative positions of the eight main reinforcing bars 10 are fixed.

  In the installation work of the column base structure 2, the stirrups 12 are arranged at a stage after the respective end portions 10 a of the main reinforcing bars 10 are connected to the intermediate connecting member 8. In addition, the eight main reinforcing bars 10 whose mutual positional relationship is fixed by the ribs 12 are not shown in which the lower four are placed on the discarded concrete 14 before the foundation concrete 6 is placed. The eight main reinforcing bars 10 are all arranged at a predetermined height by being placed on the block or the like. The eight main reinforcing bars 10 are embedded in the foundation concrete 6 to be placed with the height set in this manner.

  Next, the intermediate connecting member 8 is formed with a substantially rectangular opening 8a through which the lower end 4a of the steel column 4 penetrates inside the frame shape. As shown in FIG. 1, the opening 8 a has a cross-sectional shape of the lower end 4 a of the steel column 4 and the steel column 4 so that the lower end 4 a of the steel column 4 penetrates through the surrounding space. The lower end 4a of the base plate 11 is formed so as to open with a size larger than the planar shape of the base plate 11 welded.

  As shown in FIGS. 1 and 2, the column base structure 2 includes a steel column 4 in a space between the outer peripheral surface of the lower end portion 4 a of the steel column 4 and the inner peripheral surface of the opening 8 a of the intermediate connecting member 8. Part of the foundation concrete 6 that is solidified integrally with the foundation concrete 6 that is cast around the lower end 4a and the intermediate connecting member 8 of the steel column 4, and the lower end 4a of the steel column 4 and the main reinforcement 10 Forces can be transmitted between them.

  Here, in the basic concrete 6, a portion filled in a space between the outer peripheral surface of the lower end portion 4 a of the steel column 4 and the inner peripheral surface of the opening 8 a of the mediation connecting member 8 is used as a grout material. Therefore, this portion is called a grout material. Grout material generally refers to a fluid that is injected in a construction work to fill a space such as a cavity, a gap, or a gap.

  In addition, a plurality of female screws 8b are formed at both ends of the intermediate connecting member 8 in the left-right direction in the drawing. Each of the plurality of female screws 8b of the intermediate connecting member 8 is screw-coupled with an end portion 10a of the main reinforcing bar 10 on which a male screw is processed.

  In such a column base structure 2, the intermediate connecting member 8 does not have to be directly fixed to the steel column 4 by welding. Therefore, in the stage before the foundation concrete 6 is placed in the installation operation, the main reinforcing bar 10 is placed. The installation work of the steel column 4 can be performed independently of the connection work between the intermediate connection member 8 and the intermediate connection member 8 and the bar arrangement work such as the stirrup 12 including the main rebar 10. .

  That is, the column base structure 2 is in the process of being installed before the construction work such as the connection work between the main reinforcing bar 10 and the intermediate connection member 8 and the reinforcement work such as the main reinforcing bar 10 and the stirrup 12. In either case after construction, the installation work of the steel column 4 can be performed independently.

  According to the column base structure 2 and the installation method thereof according to this embodiment, the steel column 4 and the intermediate connection member 8 do not have to be directly fixed by welding. Work can be facilitated.

  Further, according to the column base structure 2 and the installation method thereof according to the present embodiment, the main reinforcing bar 10 and the intermediate connection member 8 are provided at the stage before the foundation concrete 6 is placed in the installation work of the column base structure 2. Can be constructed independently from each other, and the installation work of the steel column 4 can be performed independently. Construction efficiency can be improved, and the construction period can be prevented from prolonging.

  In addition, according to the column base structure 2 and the installation method thereof according to the present embodiment, the transmission of force between the steel column 4 and the intermediate connection member 8 is performed between the outer peripheral surface of the lower end portion 4a of the steel column 4 and In addition, since it is performed via a grout material (foundation concrete 6) filled between the inner peripheral surface of the opening 8a of the intermediate connecting member 8, the transmission strength of the force between the steel column 4 and the intermediate connecting member 8 is achieved. It is also possible to prevent the decrease.

  Next, FIG.3 and FIG.4 is a figure referred in order to demonstrate the column base structure 20 which concerns on the 2nd Embodiment of this invention, and its installation method. The same parts as those of the column base structure 2 according to the first embodiment will be described using the same reference numerals, and overlapping descriptions of the same configurations will be omitted.

  As shown in FIG. 3, the column base structure 20 according to the present embodiment is such that the inner dimensions of the openings 8a of the two upper and lower intermediate connection members 8 are the column bases according to the first embodiment. It is formed slightly larger than the inner dimension of the opening 8a of the structure 2.

  Further, as shown in FIGS. 3 and 4, the column base structure 20 penetrates both the openings 8 a of the two intermediate connecting members 8 arranged above and below, and is placed on the discarded concrete 14. A cylindrical form member 22 is provided. This formwork member 22 is formed by joining four steel plates together by welding.

  The formwork member 22 is installed before the foundation concrete 6 is placed and before the steel column 4 is installed so that its installation is not hindered. Further, the mold member 22 is formed such that its height is set slightly higher than the depth of the foundation concrete 6.

  Further, the size of the outer periphery of the horizontal cross section perpendicular to the height direction (vertical direction in FIG. 4) of the mold member 22 is set to a size that can be fitted into the opening 8 a of the mediation connecting member 8. ing. As a result, the mold member 22 surrounds the entire horizontal depth of the foundation concrete 6 in a range that is smaller than the opening 8 a of the mediation connecting member 8 by the thickness of the mold member 22.

  The steel column 4 is installed such that its lower end 4 a and its base plate 11 are arranged inside the mold member 22. Further, the mold member 22 is filled with the grout material 24 so as to surround the steel column 4. The grout material 24 may be a concrete having the same component as that of the foundation concrete 6 placed on the outside of the mold member 22 (opposite to the steel column 4), or a concrete having a component different from that of the foundation concrete 6. Or a synthetic resin.

  The column base structure 20 includes an operation of arranging the steel column 4 and a filling operation of the grout material 24 inside the formwork member 22, a connecting operation between the main reinforcing bar 10 and the intermediate connecting member 8, a main reinforcing bar 10, The bar arrangement work such as the stirrup 12 and the filling work of the basic concrete 6 can be independently performed.

  According to the column base structure 20 and the installation method thereof according to the present embodiment, the intermediate connection member 8 does not have to be directly fixed to the steel column 4 by welding, as in the first embodiment. Since it is good, the installation work of the column base structure 20 can be made easy.

  Further, according to the column base structure 20 and the installation method thereof according to the present embodiment, as in the first embodiment, before the foundation concrete 6 is placed during the installation work of the column base structure 20. In the stage, the connecting work between the main reinforcing bar 10 and the intermediate connecting member 8, the reinforcing work such as the main reinforcing bar 10 and the stirrup 12 and the installation work of the steel column 4 can be independently performed. Therefore, the degree of freedom of the work procedure can be increased to improve the construction efficiency, and the construction period can be prevented from being prolonged.

  Moreover, according to the column base structure 20 and the installation method thereof according to the present embodiment, the installation work of the foundation concrete 6 and the installation work of the steel column 4 are separately performed in the installation work of the column base structure 20. Therefore, it is possible to further increase the degree of freedom of the work procedure, improve the construction efficiency, and prevent the construction period from being prolonged.

  Next, FIG.5 and FIG.6 is a figure referred in order to demonstrate the column base structure 30 which concerns on the 3rd Embodiment of this invention, and its installation method. The same parts as those of the column base structure 20 according to the second embodiment will be described using the same reference numerals, and overlapping descriptions of the same configurations will be omitted.

  The column base structure 30 according to the present embodiment includes a mold member 32 that is different from the mold member 22 of the column base structure 20 according to the second embodiment. The formwork member 22 according to the second embodiment is integrally formed over the entire casting depth of the foundation concrete 6, whereas the formwork member of the column base structure 30 according to the present embodiment. 32 differs in that it is divided in the vertical direction by two intermediary connecting members 8 arranged vertically and divided into three mold members 32a, 32b, 32c.

  Each of the three formwork members 32a, 32b, and 32c is formed so as to surround a horizontal region that is substantially in the same range as the inner horizontal region that is surrounded by the opening 8a of the intermediate connecting member 8. The size of the horizontal region surrounded by each of the mold members 32a, 32b, and 32c is formed to be slightly larger than the size of the horizontal region surrounded by the opening 8a of the mediation connecting member 8. For this reason, even if the upper and lower end surfaces of the mold members 32a, 32b, and 32c are slightly displaced in the horizontal direction, the entire horizontal surfaces of the upper and lower end surfaces can be reliably brought into contact with the intermediary connecting member 8, and Can be fixed to.

  Each of the formwork members 32a, 32b, and 32c is installed in a state where it is fixed to one or both of the two intermediary connecting members 8 by welding at the stage before the foundation concrete 6 is placed. Yes.

  According to the column base structure 30 and the installation method thereof according to the present embodiment as described above, the installation work of the column base structure 30 can be facilitated similarly to the second embodiment. Construction efficiency can be improved by increasing the degree of freedom of the procedure of installation work.

  Further, according to the column base structure 30 and the installation method thereof according to the present embodiment, the mold member 32 is divided into three mold members 32a, 32b, and 32c, so that each of them is reduced in size. Therefore, the conveyance work etc. of this formwork member 32a, 32b, 32c can be made easy.

  In addition, according to the column base structure 30 and the installation method thereof according to the present embodiment, the size of each inner horizontal region surrounded by each of the three formwork members 32a, 32b, and 32c is determined by the intermediate connection member 8. The outer periphery of the grout material 24 inside the mold member 32 is solidified so as to have a step shape by being formed so as to be slightly larger than the inner horizontal region surrounded by the opening 8a. When the vertical load is applied to the steel column 4, the transmission efficiency of the vertical load to the intermediate connecting member 8 can be improved.

  Next, FIG.7 and FIG.8 is a figure referred in order to demonstrate the column base structure 40 which concerns on the 4th Embodiment of this invention, and its installation method. The same parts as those of the column base structure 30 according to the third embodiment will be described using the same reference numerals, and overlapping descriptions of the same configurations will be omitted.

  As shown in FIGS. 7 and 8, the column base structure 40 according to the present embodiment is a portion in the vicinity of the outside of each of the four corners of the opening 8 a on the upper surface of the intermediate connecting member 8 above the column base structure 40. Four L-shaped members 42a having substantially the same L-shaped horizontal cross section are disposed outside the formwork member 32a and have substantially the same length as the height of the formwork member 32a. It is being fixed on the upper surface of this by welding.

  Further, as shown in FIG. 7, each of the L-shaped members 42a has a horizontal cross-sectional shape in which each of the "L" -shaped vertical bars and horizontal bars extends in the corresponding corners of the opening 8a. Are arranged so that each of the two sides forming the line is parallel to the extending direction.

  Further, as shown in FIG. 8, the lower intermediate connecting member 8 is provided with four L-shaped members 42c on the lower surface side, similar to the L-shaped member 42a provided on the upper intermediate connecting member 8. It has been. The four L-shaped members 42c have substantially the same length as the height of the mold member 32c.

  In addition, between the two intermediate connection members 8 arranged above and below, the outer neighboring portions of the four corners of the opening 8a on each of the opposing surfaces of the two intermediate connection members 8 are arranged. Four L-shaped members 42b having the same cross-section as the L-shaped members 42a and 42c are provided. The four L-shaped members 42b have substantially the same length as the height of the mold member 32b.

  According to the column base structure 40 and the installation method thereof according to the present embodiment as described above, the installation work of the column base structure 40 can be facilitated and the installation work of the column base structure 40 can be facilitated. Construction efficiency can be improved by increasing the degree of freedom of the procedure.

  Also, according to the column base structure 40 and the installation method thereof according to the present embodiment, the mold member 32 is divided into three mold members 32a, 32b, and 32c, as in the third embodiment. As a result, the transfer operation and the like can be facilitated, and the transmission efficiency of the vertical load to the intermediate connecting member 8 when the vertical load is applied to the steel column 4 is improved. Can be made.

  In addition, according to the column base structure 40 and the installation method thereof according to the present embodiment, four sets of L-shaped members 42a, 42b, and 42c are provided, thereby providing the formwork members 32a and 32b. , 32c are not directly fixed to the intermediate connecting member 8, but the horizontal relative position between the formwork members 32a, 32b, 32c and the intermediate connecting member 8 is during the placement work of the foundation concrete 6 or the like. It can prevent shifting.

  For this reason, according to the column base structure 40 and the installation method thereof according to the present embodiment, it is not necessary to directly fix the mold members 32a, 32b, 32c to the mediation connecting member 8, so that the mold members 32a, 32b, The installation work of 32c etc. can be made easy.

  In addition, according to the column base structure 40 and the installation method thereof according to the present embodiment, the insides of the four flat plate members constituting each of the mold members 32a, 32b, and 32c are fixed to each other by welding. Alternatively, the four flat plate members are not fixed to each other, and for example, the four flat plate members may be fixed to the L-shaped members 42a, 42b, and 42c. Therefore, an efficient work procedure can be selected based on the judgment of the worker at the construction site. For this reason, the installation work of the formwork members 32a, 32b, and 32c can be facilitated.

  Next, FIG.9 and FIG.10 is a figure referred in order to demonstrate the column base structure 50 which concerns on the 5th Embodiment of this invention, and its installation method. The same parts as those of the column base structure 2 according to the first embodiment will be described using the same reference numerals, and overlapping descriptions of the same configurations will be omitted.

  As shown in FIGS. 9 and 10, the column base structure 50 according to the present embodiment includes an intermediate connection member 52 that is different from the intermediate connection member 8 in the column base structure 2 according to the first embodiment. Yes. Further, in the column base structure 50 according to the present embodiment, a main reinforcing bar 54 different from the main reinforcing bar 10 in the column base structure 2 according to the first embodiment is used.

  The intermediate coupling member 8 in the column base structure 2 according to the first embodiment is provided with the female screw 8b. However, the intermediate coupling member 52 of the column base structure 50 according to the present embodiment includes this thread. Instead of the female screw 8b, a plurality of hooking holes 52b penetrating in the vertical direction are formed in a portion outside the opening 52a. In each of the hooking holes 52b, bent portions 54a formed by bending the respective end portions of the main reinforcing bars 54 downward are inserted and hooked.

  According to the column base structure 50 and the installation method thereof according to the present embodiment, in addition to the same effect as that of the first embodiment, with respect to the latching hole 52b of the intermediate connection member 52. By simply inserting the bent portion 54a of the main reinforcing bar 54 from above, the main reinforcing bar 54 can be hooked into the hooking hole 52b, so that the connecting operation of the intermediate connecting member 52 and the main reinforcing bar 54 is facilitated. be able to.

  In the column base structure 20 according to the second embodiment, a steel plate material is used for the mold member 22, but it is not necessary to limit to the steel plate material in this way. It may be formed of other materials.

  Further, in the column base structure 20 according to the second embodiment, the formwork member 22 is left between the foundation concrete 6 and the grout material 24, but after the foundation concrete 6 is placed. The mold member 22 may be removed before the grout material 24 is filled.

  When the frame member 22 is removed in this manner, the frame member 22 can be reused, and the boundary between the foundation concrete 6 and the grout material 24 is conspicuous after the column base structure 20 is installed. Can be eliminated. When the formwork member 22 is made of wood, the formwork member 22 must be removed after the foundation concrete 6 is placed and before the grout material 24 is filled.

  In the column base structures 30 and 40 according to the third and fourth embodiments, the formwork member 32a is left between the foundation concrete 6 and the grout material 24. It is also possible to remove the grout material 24 after filling it and before filling it.

  Further, in the column base structures 2, 20, 30, and 40 according to the first, second, third, and fourth embodiments, a screw is formed on the end portion 10a of the main reinforcing bar 10, and this is mediated. Although the connection is made by screwing the female screw 8b of the connecting member 8, the end 10a of the main reinforcing bar 10 is connected to other means such as welding, or as in the fifth embodiment. You may connect with the mediation connection member 8 by what kind of means, such as another means.

  Further, in the column base structure 20 according to the second embodiment, four horizontal sections having substantially the same length as the height of the mold member 32a are substantially L-shaped outside the mold member 32a. The L-shaped member 42a is used, but when the formwork member 22 is used as in the second and third embodiments, the second and third embodiments It is also possible to install the L-shaped member.

It is a top view which shows the column base structure 2 which concerns on the 1st Embodiment of this invention. It is side surface sectional drawing which shows the column base structure 2 which concerns on the 1st Embodiment of this invention. It is a top view which shows the column base structure 20 which concerns on the 2nd Embodiment of this invention. It is side surface sectional drawing which shows the column base structure 20 which concerns on the 2nd Embodiment of this invention. It is a top view which shows the column base structure 30 which concerns on the 3rd Embodiment of this invention. It is side surface sectional drawing which shows the column base structure 30 which concerns on the 3rd Embodiment of this invention. It is a top view which shows the column base structure 40 which concerns on the 4th Embodiment of this invention. It is side surface sectional drawing which shows the column base structure 40 which concerns on the 4th Embodiment of this invention. It is a top view which shows the column base structure 50 which concerns on the 5th Embodiment of this invention. It is side surface sectional drawing which shows the column base structure 50 which concerns on the 5th Embodiment of this invention.

Explanation of symbols

2 Column base 4 Steel column 4a Lower end 6 Basic concrete 8 Mediation connecting member 8a Opening 8b Female screw 10 Main reinforcement 11 Base plate 12 Stirrup 14 Discarded concrete 20 Column base structure 22 Frame member 24 Grout material 30 Column base structure 32, 32a, 32b, 32c Frame member 40 Column base structure 42a, 42b, 42c L-shaped steel 50 Column base structure 52 Intermediary connecting member 52a Opening 52b Locking hole 54 Main rebar 54a Bending portion

Claims (8)

A column base structure in which the intermediate connecting member and the end of the main reinforcing bar are connected in the foundation concrete,
A steel column is inserted into the central opening formed in the mediating connecting member,
A grouting material is filled in a space between the outer peripheral part of the steel column and the inner peripheral surface of the central opening of the mediation connecting member.   2. The column base structure according to claim 1, wherein a formwork member having a height substantially equal to a height from the abandoned concrete to the upper surface of the foundation concrete is provided on the intermediate connection member side of the space.   The column base structure according to claim 2, wherein the formwork member is provided so as to sandwich the mediation connecting member from above and below.   The column base structure according to claim 2 or 3, wherein an L-shaped member having an L-shaped horizontal cross section is installed outside the formwork member. A hooking hole penetrating in the vertical direction is formed in the mediation connecting member,
The bent portion provided at the end portion of the main reinforcing bar is inserted into the hooking hole so that the end portion of the main reinforcing bar is hooked by the mediating connecting member. The column base structure according to any one of claims 1 to 4. A method of installing a column base structure in which the intermediate connecting member and the end of the main reinforcing bar are connected in the foundation concrete,
Installation work of a steel column that is constructed by inserting a steel column through a space in the central opening formed in the mediating connecting member,
A column base structure installation method characterized in that the intermediate connection member and the end portion of the main reinforcing bar are connected to each other and can be separately arranged. Before placing the concrete foundation, on the intermediate connecting member side of the space, a formwork member having a height substantially equal to the height from the discarded concrete to the top surface of the foundation concrete is installed,
The method for installing a column base structure according to claim 6, wherein a grout material is filled in a space between the steel column and the formwork member before or after foundation concrete is placed.   The method for installing a column base structure according to claim 7, wherein all or part of the formwork member is removed after placing and solidifying the foundation concrete and before filling with the grout material.

Images