JP6114600B2 - Reinforced concrete structure - Google Patents

Reinforced concrete structure Download PDF

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JP6114600B2
JP6114600B2 JP2013065086A JP2013065086A JP6114600B2 JP 6114600 B2 JP6114600 B2 JP 6114600B2 JP 2013065086 A JP2013065086 A JP 2013065086A JP 2013065086 A JP2013065086 A JP 2013065086A JP 6114600 B2 JP6114600 B2 JP 6114600B2
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column
reinforced concrete
joint
bottomed hole
concrete
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JP2014189994A (en
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祐輔 近藤
祐輔 近藤
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Kumagai Gumi Co Ltd
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本発明は、増設用の柱を接合するための接合部を備えた鉄筋コンクリート構造物に関する。   The present invention relates to a reinforced concrete structure provided with a joint for joining a pillar for expansion.

上部に増築予定がある建物の構築方法として、既設部分の最上階の本設床を構築せずに、当該本設床よりも少し下った位置に軽量材を使用して仮屋根を設けるようにし、増築予定部分を構築する際には、仮屋根を残したまま上記本設床を構築する方法が知られている(特許文献1等参照)。   As a method of constructing a building that is scheduled to be added to the upper part, a temporary roof should be provided using a lightweight material at a position slightly lower than the main floor, without constructing the uppermost main floor of the existing part. In constructing an extension planned part, a method of constructing the permanent floor with a temporary roof left is known (see Patent Document 1).

特開平05−171819号公報JP 05-171819 A

しかしながら、上述したような上部に増築予定がある建物の構築方法では、既設の柱の上に増設用の柱をどのように接続するのか不明であり、既設の柱の上に増設用の柱を簡単かつ確実に接続することができない。
本発明は、柱の上に増設用の柱を簡単かつ確実に接続することができる鉄筋コンクリート構造物を提供する。
However, in the method of building a building that is scheduled to be added to the upper part as described above, it is unclear how to connect the extension pillar on the existing pillar, and the extension pillar is placed on the existing pillar. It cannot be easily and reliably connected.
The present invention provides a reinforced concrete structure capable of easily and reliably connecting an additional pillar on a pillar.

本発明に係る鉄筋コンクリート構造物は、鉄筋コンクリート構造の柱の上端部に増設用の柱の下端を接続するための柱下端接合部を備え、柱下端接合部が、増設用の柱の下端面より下方に突出する柱主筋と接続するための柱主筋接続部を備え、柱主筋接続部は、増設用の柱の下端面より下方に突出する柱主筋を挿入するために柱下端接合部の上端面に開口して下方に延長する有底穴と、鉄筋コンクリート構造物の柱の内部に上下方向に延長するように設けられた柱主筋の上端より上方に延長して上端が有底穴の底からコンクリートを挟んで下方に位置されるように設けられた接続用鉄筋と、有底穴の周囲及び鉄筋の周囲を上下方向にスパイラル状に延長するように柱の内部に設けられたスパイラル筋とを備えて構成されたので、増設用の柱の下端面より下方に突出する柱主筋を有底穴に挿入して、当該有底穴内、及び、増設用の柱の下端面より下方に突出する柱主筋の周囲にコンクリートやモルタル等の接合手段を充填することによって、当該鉄筋コンクリート構造の柱の上端部に増設用の柱を簡単かつ確実に接続することができ、当該鉄筋コンクリート構造物に増設用の柱を簡単に増設できるようになる。また、鉄筋コンクリート構造の柱の内部に上下方向に延長するように設けられた柱主筋の上端定着部より上方に延長した接続用鉄筋の上端は有底穴の底からコンクリート部を挟んで下方に位置されているので、接続用鉄筋の上端の露出が防止され、接続用鉄筋が雨水等から保護されるので、接続用鉄筋の劣化を防止できる。さらに、スパイラル筋が有底穴の周囲及び接続用鉄筋の周囲に跨がるように設けられており、コンクリートがスパイラル筋を形成する螺旋体の螺旋間に入り込むために、有底穴と接続用鉄筋との一体性が向上し、柱下端接合部の内部に設けられている接続用鉄筋と有底穴に挿入された増設用の柱の下端面より下方に突出する柱主筋との連続性を間接的に確保できるので、接合度が向上する。
鉄筋コンクリート構造物の柱の内部に上下方向に延長するように設けられた柱主筋の上端には、定着部が形成されたので、柱主筋の上端を押さえ込んで、鉄筋コンクリート構造物のコンクリートにかかる引張りの力を柱主筋に負担させることができる。
The reinforced concrete structure according to the present invention includes a column lower end joint for connecting the lower end of the extension column to the upper end of the column of the reinforced concrete structure, and the column lower end junction is below the lower end surface of the extension column. The column main bar connection part is connected to the upper end surface of the column lower end joint to insert the column main bar protruding downward from the lower end surface of the additional column. The bottomed hole that opens and extends downward, and the upper end of the column main bar that is provided so as to extend vertically inside the column of the reinforced concrete structure, and the top end of the concrete from the bottom of the bottomed hole A connecting rebar provided so as to be positioned on the lower side, and a spiral rebar provided inside the column so as to extend in a spiral shape in the vertical direction around the bottomed hole and around the rebar. Because of the construction of the pillar for expansion Insert a column main bar that protrudes downward from the end face into the bottomed hole, and fill the bottomed hole and the area around the column main bar that protrudes downward from the lower end surface of the expansion pillar with filling means such as concrete or mortar. By doing so, it is possible to easily and reliably connect the extension column to the upper end of the column of the reinforced concrete structure, and to easily add the extension column to the reinforced concrete structure. In addition, the upper end of the connecting reinforcing bar that extends upward from the upper end fixing part of the column main reinforcing bar that extends in the vertical direction inside the column of the reinforced concrete structure is positioned below the bottom of the bottomed hole with the concrete part in between. Therefore, exposure of the upper end of the connecting reinforcing bar is prevented and the connecting reinforcing bar is protected from rain water or the like, so that deterioration of the connecting reinforcing bar can be prevented. Further, the spiral reinforcement is provided so as to straddle the periphery of the bottomed hole and the connection reinforcing bar, so that the concrete enters between the spirals of the spiral body forming the spiral reinforcement, and the bottomed hole and the connection reinforcing bar are provided. And the indirect continuity between the connecting reinforcing bar provided inside the column bottom joint and the column main bar protruding downward from the bottom end surface of the additional column inserted into the bottomed hole Therefore, the joining degree is improved.
Since the anchoring part is formed at the upper end of the main column reinforcement that extends vertically inside the column of the reinforced concrete structure, the upper end of the column main reinforcement is pressed down and the tension applied to the concrete of the reinforced concrete structure is reduced. Forces can be applied to the main column.

(a)は鉄筋コンクリート構造物の柱下端接合部の上側から柱下端接合部の上端面を見た図、(b)鉄筋コンクリート構造物の縦断面を示す図。(A) The figure which looked at the upper end surface of the column lower end junction part from the upper side of the column lower end junction part of a reinforced concrete structure, (b) The figure which shows the longitudinal cross-section of a reinforced concrete structure. 増設用の柱と鉄筋コンクリート構造物の柱下端接合部とが接合された状態を示す縦断面図。The longitudinal cross-sectional view which shows the state by which the pillar for extension and the pillar lower end junction part of a reinforced concrete structure were joined.

実施形態1
図2に示すように、鉄筋コンクリート構造物1は、鉄筋コンクリート構造の柱2の上端部に増設用の柱3の下端を接続するための柱下端接合部4を備え、当該柱下端接合部4が、増設用の柱3の下端面31より下方に突出する柱主筋5と接続するための柱主筋接続部10を備えた構成である。
Embodiment 1
As shown in FIG. 2, the reinforced concrete structure 1 includes a column lower end joint 4 for connecting the lower end of the additional column 3 to the upper end of the column 2 of the reinforced concrete structure, and the column lower end joint 4 is It is the structure provided with the column main reinforcement connection part 10 for connecting with the column main reinforcement 5 which protrudes below from the lower end surface 31 of the pillar 3 for expansion.

図1に示すように、鉄筋コンクリート構造物1の柱2は、柱2の上部に最上階の梁6と接合される柱梁接合部7を備え、当該柱梁接合部7よりも上方に突出する柱2の上端部に増設用の柱3の下端を接続するための柱下端接合部(柱脚接合部)4を備えた構成である。
柱下端接合部4は、柱主筋接続部10と当該柱主筋接続部10の周囲に打設されて固化したコンクリート9とにより形成された鉄筋コンクリート構造部である。
柱下端接合部4内に設けられた柱主筋接続部10は、接続用鉄筋11と、有底穴12と、スパイラル筋13とにより構成される。
接続用鉄筋11は、鉄筋コンクリート構造物1の柱2の内部に上下方向に延長するように設けられた柱主筋11Aの上端に形成された定着部15Aより上方に延長して上端43が有底穴12の底面42からコンクリート9を挟んで下方に位置されるように設けられた鉄筋である。例えば、鉄筋コンクリート構造物1の柱2の内部に上下方向に延長するように設けられる柱主筋を形成する鉄筋として柱梁接合部7よりも上方に突出する長さの鉄筋を用い、定着板15が当該鉄筋の上端よりも下方に位置されて柱梁接合部7の上部に位置するように設けられることで柱主筋11Aの上端に定着部15Aが形成され、この定着部15Aより上方に位置される部分の鉄筋を接続用鉄筋11とする。尚、定着板15は、柱主筋11Aの上端を押さえ込んで、柱梁接合部7のコンクリート9にかかる引張りの力を柱主筋11Aに負担させるための構成部品である。
有底穴12は、増設用の柱3の下端面31より下方に突出する柱主筋5を挿入するために柱下端接合部4の上端面41に開口し、下方に延長した下端が底面42となった有底穴である。有底穴12は、例えば円柱状にくり貫かれた形状の有底穴である。
有底穴12と接続用鉄筋11とがそれぞれ対応して上下に位置されるように構成される。例えば、例えば円柱状にくり貫かれた形状の有底穴12の中心軸と接続用鉄筋11の中心軸とが一致するように有底穴12と接続用鉄筋11とが上下に位置されて、有底穴12の底面42と接続用鉄筋11の上端43との間にコンクリート9が介在する間隔H1が設けられた構成である。
スパイラル筋13は、上下に位置された1組の有底穴12及び接続用鉄筋11の中心軸に沿って当該接続用鉄筋11及び有底穴12の外周面の外側を螺旋を描くように配置された鉄筋である。当該スパイラル筋13は、増設用の柱3の下端面31より下方に突出する柱主筋5と柱2の内部に設けられた接続用鉄筋11とを結び付けて力の伝達を確保するため構成部品である。
As shown in FIG. 1, the column 2 of the reinforced concrete structure 1 includes a column beam joint 7 that is joined to the uppermost beam 6 on the top of the column 2, and projects upward from the column beam joint 7. In this configuration, a column lower end joint (column leg joint) 4 for connecting the lower end of the additional column 3 to the upper end of the column 2 is provided.
The column lower end joint portion 4 is a reinforced concrete structure portion formed by the column main bar connecting portion 10 and the concrete 9 cast around the column main bar connecting portion 10 and solidified.
The column main bar connecting portion 10 provided in the column lower end joint portion 4 includes a connecting reinforcing bar 11, a bottomed hole 12, and a spiral bar 13.
The connecting reinforcing bar 11 extends above the fixing portion 15A formed at the upper end of the column main reinforcing bar 11A provided so as to extend in the vertical direction inside the column 2 of the reinforced concrete structure 1, and the upper end 43 has a bottomed hole. 12 is a reinforcing bar provided so as to be positioned below the concrete 9 from the bottom surface 42 of 12. For example, a reinforcing bar having a length protruding above the beam-to-column joint 7 is used as a reinforcing bar forming a column main reinforcing bar provided so as to extend in the vertical direction inside the column 2 of the reinforced concrete structure 1, and the fixing plate 15 is used. The fixing portion 15A is formed at the upper end of the column main reinforcing bar 11A by being positioned below the upper end of the reinforcing bar and positioned above the column beam joint 7, and positioned above the fixing portion 15A. The reinforcing bars of the part are referred to as connecting reinforcing bars 11. The fixing plate 15 is a component for pressing the upper end of the column main reinforcement 11A and causing the column main reinforcement 11A to bear the tensile force applied to the concrete 9 of the column beam joint 7.
The bottomed hole 12 opens to the upper end surface 41 of the column lower end joint portion 4 in order to insert the column main reinforcement 5 projecting downward from the lower end surface 31 of the additional column 3, and the lower end extended downward is connected to the bottom surface 42. It is a bottomed hole. The bottomed hole 12 is, for example, a bottomed hole that is formed in a cylindrical shape.
The bottomed hole 12 and the connecting reinforcing bar 11 are configured to be positioned vertically corresponding to each other. For example, the bottomed hole 12 and the connecting rebar 11 are positioned up and down so that the center axis of the bottomed hole 12 having a shape hollowed out in a columnar shape and the center axis of the connecting rebar 11 coincide with each other. This is a configuration in which a gap H <b> 1 in which the concrete 9 is interposed is provided between the bottom surface 42 of the bottomed hole 12 and the upper end 43 of the connecting reinforcing bar 11.
The spiral reinforcing bars 13 are arranged so as to draw a spiral outside the outer peripheral surfaces of the connecting reinforcing bars 11 and the bottomed holes 12 along the center axis of the pair of bottomed holes 12 and the connecting reinforcing bars 11 positioned above and below. Reinforced bars. The spiral bar 13 is a component for associating the column main bar 5 protruding downward from the lower end surface 31 of the additional column 3 and the connecting bar 11 provided inside the column 2 to ensure the transmission of force. is there.

このように上下に間隔H1を隔てて配置された有底穴12及び接続用鉄筋11と当該有底穴12及び接続用鉄筋11の周囲を中心軸に沿って上下方向に螺旋状に延長するように設けられたスパイラル筋13との組を複数組備える。
つまり、柱下端接合部4は、有底穴12と接続用鉄筋11とスパイラル筋13とにより構成された柱主筋接続部10を、複数備えた構成である。例えば、柱下端接合部4が断面四角形の鉄筋コンクリートブロックにより構成される場合、複数の柱主筋接続部10が四角形の4つの柱側面4a;4a…に沿って設けられる。
In this way, the bottomed hole 12 and the connecting rebar 11 arranged vertically with the interval H1 and the periphery of the bottomed hole 12 and the connecting rebar 11 are extended spirally in the vertical direction along the central axis. A plurality of sets with the spiral muscles 13 provided in is provided.
That is, the column lower end joint portion 4 includes a plurality of column main bar connection portions 10 each including the bottomed hole 12, the connecting reinforcing bar 11, and the spiral bar 13. For example, when the column lower end joint portion 4 is configured by a reinforced concrete block having a square cross section, a plurality of column main bar connection portions 10 are provided along the four column side surfaces 4a;

即ち、柱下端接合部4に設けられた柱主筋接続部10は、増設用の柱3の下端面31より下方に突出する柱主筋5を挿入するために柱下端接合部4の上端面41に開口して下方に延長する有底穴12と、鉄筋コンクリート構造物1の柱2の内部に上下方向に延長するように設けられた柱主筋11Aの定着部15Aより上方に延長して上端43が有底穴12の底面42からコンクリート9を挟んで下方に位置されるように設けられた接続用鉄筋11と、例えば円柱状にくり貫かれた形状の有底穴42の中心軸回りの穴内周面の周囲及び接続用鉄筋11の周囲を中心軸に沿って上下方向に螺旋状に延長するように柱2の躯体となるコンクリート9の内部に設けられたスパイラル筋13とを備えて構成される。   That is, the column main bar connecting portion 10 provided in the column lower end joint 4 is formed on the upper end surface 41 of the column lower end joint 4 in order to insert the column main bar 5 protruding downward from the lower end surface 31 of the additional column 3. A bottomed hole 12 that opens and extends downward, and has an upper end 43 that extends upward from the fixing portion 15A of the column main reinforcement 11A provided so as to extend in the vertical direction inside the column 2 of the reinforced concrete structure 1. The inner surface of the hole around the central axis of the connecting rebar 11 provided so as to be positioned below the bottom surface 42 of the bottom hole 12 with the concrete 9 in between, and the bottomed hole 42 having a shape hollowed out in a columnar shape, for example. And a reinforcing bar 13 provided inside the concrete 9 serving as a frame of the pillar 2 so as to extend in a spiral manner in the vertical direction along the central axis.

図2を参照し、柱3の増設方法について説明する。
柱3を増設する場合、当該増設用の柱3の下端面31より下方に突出する複数の柱主筋5をそれぞれ対応する有底穴12に挿入し、柱3の下端面31と柱下端接合部4の上端面41との間にコンクリートやモルタル等の接合手段20を充填可能な隙間H2を設けるように図外のスペーサなどで柱3の下端面31を柱下端接合部4の上端面41に支持させた後、柱2の側方から隙間H2を介して柱3の下端面31と柱下端接合部4の上端面41間、及び、各有底穴12内に接合手段20を充填する。このように、接合手段20が、隙間H2を介して柱3の下端面31と柱下端接合部4の上端面41間、及び、各有底穴12内に充填され、固化することによって、柱下端接合部4の上端面41と柱3の下端面31とが接合され、柱下端接合部4の上方に柱3が増設される。
尚、隙間H2は接合手段20を充填できる隙間であれば良い。例えば10mm程度の隙間H2を設ければ良い。
With reference to FIG. 2, the extension method of the pillar 3 is demonstrated.
When the column 3 is added, a plurality of column main bars 5 projecting downward from the lower end surface 31 of the extension column 3 are inserted into the corresponding bottomed holes 12, and the lower end surface 31 of the column 3 and the column lower end joint portion are inserted. The lower end surface 31 of the column 3 is connected to the upper end surface 41 of the column lower end joint portion 4 with a spacer or the like not shown in the figure so as to provide a gap H2 capable of filling the joining means 20 such as concrete or mortar between the upper end surface 41 of the column 4 and the like. After being supported, the joining means 20 is filled between the lower end surface 31 of the column 3 and the upper end surface 41 of the column lower end joint portion 4 and between the bottomed holes 12 from the side of the column 2 through the gap H2. As described above, the joining means 20 is filled between the bottom end surface 31 of the column 3 and the top end surface 41 of the column bottom end joint portion 4 through the gap H2 and in each bottomed hole 12, and solidifies. The upper end surface 41 of the lower end joint 4 and the lower end surface 31 of the column 3 are joined, and the column 3 is added above the column lower end joint 4.
The gap H2 may be any gap that can fill the bonding means 20. For example, a gap H2 of about 10 mm may be provided.

実施形態1によれば、鉄筋コンクリート構造の柱2の上端部に増設用の柱3を簡単かつ確実に接続することができ、鉄筋コンクリート構造物1に増設用の柱3を簡単に増設できるようになる。
また、鉄筋コンクリート構造物1の内部に設けられている接続用鉄筋11の上端43は有底穴12の底面42からコンクリート9を挟んで下方に位置されているので、接続用鉄筋11の露出が防止される。従って、接続用鉄筋11が雨水等から保護されるので、接続用鉄筋11の劣化を防止できる。
また、スパイラル筋13が有底穴12の周囲及び接続用鉄筋11の周囲に跨がるように設けられており、コンクリート9がスパイラル筋13を構成する螺旋体の螺旋間に入り込むために、有底穴12と接続用鉄筋11との一体性が向上する。従って、鉄筋コンクリート構造物1の内部に設けられている接続用鉄筋11と有底穴12に挿入された増設用の柱3の下端面31より下方に突出する柱主筋5との連続性を間接的に確保できるので、接合度が向上する。
According to the first embodiment, the extension pillar 3 can be easily and reliably connected to the upper end portion of the reinforced concrete structure pillar 2, and the extension pillar 3 can be easily added to the reinforced concrete structure 1. .
Moreover, since the upper end 43 of the connecting reinforcing bar 11 provided inside the reinforced concrete structure 1 is positioned below the bottom surface 42 of the bottomed hole 12 with the concrete 9 interposed therebetween, the exposure of the connecting reinforcing bar 11 is prevented. Is done. Therefore, since the connecting reinforcing bar 11 is protected from rain water or the like, the deterioration of the connecting reinforcing bar 11 can be prevented.
Further, the spiral bars 13 are provided so as to straddle the bottomed hole 12 and the connecting reinforcing bar 11, and the concrete 9 enters between the spirals of the spiral body constituting the spiral bars 13. The integrity of the hole 12 and the connecting reinforcing bar 11 is improved. Therefore, the continuity between the connecting reinforcing bar 11 provided inside the reinforced concrete structure 1 and the column main reinforcing bar 5 protruding downward from the lower end surface 31 of the additional column 3 inserted into the bottomed hole 12 is indirectly increased. Therefore, the degree of joining is improved.

また、柱下端接合部4の上端面41が、増設用の柱3の下端面31に形成された凸面又は凹面に対応する凹面又は凸面を備えた構成とすれば、柱下端接合部4の上端面41と増設用の柱3の下端面31との間に充填するコンクリートやモルタル等の接合手段20の付着強度が向上するので、好ましい。   In addition, if the upper end surface 41 of the column lower end joint portion 4 has a convex surface formed on the lower end surface 31 of the additional column 3 or a concave surface corresponding to the concave surface or a convex surface, This is preferable because the adhesion strength of the joining means 20 such as concrete or mortar filled between the end face 41 and the lower end face 31 of the additional pillar 3 is improved.

尚、実施形態1においては、鉄筋コンクリート構造物1、増設用の柱3は、予め工場で製作したプレキャストコンクリートを用いて現場に運搬して現場で構築してもよいし、現場にて型枠を組んで鉄筋を配筋するとともに、有底穴12を形成するための抜き型枠(中子)を設置して型枠内に生コンクリートを打設することで構築しても良い。   In the first embodiment, the reinforced concrete structure 1 and the extension pillar 3 may be transported to the site using precast concrete manufactured in advance in the factory and built on the site, or the formwork may be formed on the site. It may be constructed by arranging the reinforcing bars by assembling them and installing a punching mold (core) for forming the bottomed hole 12 and placing ready-mixed concrete in the mold.

スパイラル筋13は、接続用鉄筋11及び有底穴12の外周側のほぼ全体に渡って設けられていることが好ましいが、少なくとも有底穴12の底部と接続用鉄筋11の上端部とに跨がるように設けられていればよい。
また、スパイラル筋13の代わりにフープ筋を用いてもよい。
また、上記では柱主筋11Aの上端に定着板15を設けて定着部15Aが形成された構成を示したが、柱主筋11Aの上端に定着板15を設けずに柱主筋11Aを定着させた構成としてもよい。
The spiral rebar 13 is preferably provided over substantially the entire outer peripheral side of the connecting rebar 11 and the bottomed hole 12, but spans at least the bottom of the bottomed hole 12 and the upper end of the connecting rebar 11. What is necessary is just to be provided so that it may come.
Further, a hoop line may be used instead of the spiral line 13.
In the above description, the fixing plate 15 is provided at the upper end of the column main reinforcement 11A to form the fixing portion 15A. However, the column main reinforcement 11A is fixed without providing the fixing plate 15 at the upper end of the column main reinforcement 11A. It is good.

実施形態2
尚、本発明の鉄筋コンクリート構造物は、鉄筋コンクリート構造の柱の上端部に増設用の柱を接続するための柱下端接合部を備え、柱下端接合部が、増設用の柱の下端面より下方に突出する柱主筋と接続するための柱主筋を備えた構成であれば良い。
例えば、柱下端接合部が、増設用の柱の下端面より下方に突出する柱主筋と接続するための柱主筋を柱の上端面より突出するように備えた構成であっても良い。この場合、柱を増設する工事を行うまでの間は、柱の上端面より突出する柱主筋が錆びないように当該柱主筋を覆い材で覆っておけばよい。そして、柱を増設する工事を行う場合に、覆い材を外して柱の上端面より突出した柱主筋と増設用の柱の下端面より下方に突出する柱主筋とを接続することにより、柱を増設すればよい。この場合、柱主筋の上部に増設用の柱の下端面より下方に突出する柱主筋との接続を容易にするための接続金具を取り付けておけば接続作業をより容易にできる。
また、柱下端接合部が、増設用の柱の下端面より下方に突出する柱主筋と接続するための柱主筋を内部に備えた構成であっても良い。この場合、柱を増設する工事を行う場合に、柱下端接合部のコンクリートを斫って柱主筋を露出させてから、当該柱主筋と増設用の柱の下端面より下方に突出する柱主筋とを接続することにより、柱を増設すればよい。
Embodiment 2
The reinforced concrete structure of the present invention includes a column lower end joint for connecting an additional column to the upper end of a reinforced concrete structure column, and the column lower end joint is below the lower end surface of the additional column. What is necessary is just the structure provided with the column main reinforcement for connecting with the protruding column main reinforcement.
For example, the structure which equips the column lower end junction part with the column main reinforcement for connecting with the column main reinforcement which protrudes below from the lower end surface of the column for expansion so that it may protrude from the upper end surface of a column may be sufficient. In this case, it is sufficient to cover the column main bar with a covering material so that the column main bar protruding from the upper end surface of the column does not rust until construction for adding the column is performed. Then, when performing construction to add a column, remove the covering material and connect the column reinforcement that protrudes from the upper end surface of the column to the column reinforcement that protrudes downward from the lower end surface of the extension column. Just add. In this case, if a connection fitting for facilitating connection with the column main reinforcement projecting downward from the lower end surface of the additional column is attached to the upper portion of the column main reinforcement, the connection work can be facilitated.
Moreover, the structure which provided the column main reinforcement for connecting with the column main reinforcement which protrudes below from the lower end surface of the column for expansion | extension in the column lower end junction part inside may be sufficient. In this case, when performing construction to add a column, after exposing the column main reinforcement by rolling the concrete at the column bottom joint, the column main reinforcement and the column main reinforcement projecting downward from the lower end surface of the extension column It is only necessary to add a pillar by connecting.

1 鉄筋コンクリート構造物、2 柱、3 増設用の柱、4 柱下端接合部、
5 増設用の柱の柱主筋、9 コンクリート、10 柱主筋接続部、11 接続用鉄筋、11A 鉄筋コンクリート構造物の柱の柱主筋、12 有底穴、13 スパイラル筋、
15A 定着部、41 鉄筋の上端、42 有底穴の底面(底)。
1 Reinforced concrete structure, 2 columns, 3 additional columns, 4 column bottom joints,
5 Column reinforcements for expansion, 9 Concrete, 10 Column reinforcements, 11 Connection reinforcement, 11A Column reinforcements for reinforced concrete structures, 12 Bottom holes, 13 Spiral reinforcement,
15A fixing portion, 41 upper end of reinforcing bar, 42 bottom surface (bottom) of bottomed hole.

Claims (2)

鉄筋コンクリート構造の柱の上端部に増設用の柱の下端を接続するための柱下端接合部を備え、
柱下端接合部が、増設用の柱の下端面より下方に突出する柱主筋と接続するための柱主筋接続部を備え
柱主筋接続部は、増設用の柱の下端面より下方に突出する柱主筋を挿入するために柱下端接合部の上端面に開口して下方に延長する有底穴と、鉄筋コンクリート構造物の柱の内部に上下方向に延長するように設けられた柱主筋の上端より上方に延長して上端が有底穴の底からコンクリートを挟んで下方に位置されるように設けられた接続用鉄筋と、有底穴の周囲及び接続用鉄筋の周囲を上下方向にスパイラル状に延長するように柱の内部に設けられたスパイラル筋とを備えて構成されたことを特徴とする鉄筋コンクリート構造物。
A column lower end joint for connecting the lower end of an additional column to the upper end of a column of reinforced concrete structure,
The column lower end joint portion includes a column main bar connecting portion for connecting to a column main bar protruding downward from the lower end surface of the additional column ,
The column main reinforcement connecting part has a bottomed hole that opens to the upper end surface of the column lower end joint and extends downward in order to insert the column main reinforcement projecting downward from the lower end surface of the extension column, and a column of the reinforced concrete structure. A connecting reinforcing bar that is provided so that the upper end of the column main reinforcement provided to extend in the vertical direction is located above the bottom of the bottomed hole and the concrete is positioned below the bottom. A reinforced concrete structure comprising spiral bars provided inside a column so as to extend in a spiral shape around a bottomed hole and a connecting reinforcing bar .
筋コンクリート構造物の柱の内部に上下方向に延長するように設けられた柱主筋の上端には、定着部が形成されたことを特徴とする請求項に記載の鉄筋コンクリート構造物。 Inside the upper end of the pillar main reinforcement which is provided so as to extend in the vertical direction of the pillars of rebars concrete structures, reinforced concrete structure according to claim 1, characterized in that the fixing portion is formed.
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