JP2007198050A - Joining method of concrete member - Google Patents

Joining method of concrete member Download PDF

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JP2007198050A
JP2007198050A JP2006019331A JP2006019331A JP2007198050A JP 2007198050 A JP2007198050 A JP 2007198050A JP 2006019331 A JP2006019331 A JP 2006019331A JP 2006019331 A JP2006019331 A JP 2006019331A JP 2007198050 A JP2007198050 A JP 2007198050A
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concrete member
concrete
existing
comb
epoxy resin
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JP4674721B2 (en
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Hiroyuki Nishide
博行 西出
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Shimizu Construction Co Ltd
Shimizu Corp
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Shimizu Construction Co Ltd
Shimizu Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an effective joining method for connecting a new concrete member to the existing concrete member in a shear force transferable manner. <P>SOLUTION: The new concrete member is formed in a state to make an engagement layer intervene between both concrete members by placing concrete for forming the new concrete member after the comb-like engagement layer 4 consisting of a hardening epoxy resin has been formed in a state to integrally fix on an alignment face by applying the epoxy resin on the surface of the existing concrete member to form the surface in the shape of a comb to make it harden. The joining method of the concrete member can be suitably adopted in the case a vibration resisting wall 3 as the new concrete member is connected to a beam 1 or a column 2 as the existing concrete member, or in the case a foundation as the new concrete member is connected to a pile as the existing concrete member. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、既設のコンクリート部材に対して新設のコンクリート部材をせん断力伝達可能に接合するための接合方法、特に、既設のコンクリート部材である梁や柱あるいは杭に対して新設のコンクリート部材である耐震壁あるいは基礎を接合する際に適用して好適な接合方法に関する。   The present invention is a joining method for joining a new concrete member to an existing concrete member so that shear force can be transmitted, and more particularly, a new concrete member to a beam, a column, or a pile that is an existing concrete member. The present invention relates to a joining method suitable for application when joining a seismic wall or foundation.

耐震性能が充分でない既存建物に対する耐震補強策として建物内部に耐震壁を付加することが広く行われている。その場合、新設する耐震壁を既存躯体に対して構造的に確実に一体化させる必要があり、そのための構造として特許文献１や特許文献２に示されるような接合構造が提案されている。
これらはいずれも鉄筋コンクリート造の既存建物における柱と梁とによる骨組（躯体フレーム）の内側に頑強な鉄筋コンクリート造の耐震壁を新設する場合のもので、梁の表面にプレキャストコンクリート製のコッタを接着することにより、そのコッタを介して既存の骨組と新設の耐震壁との間でせん断力を伝達するようにしたものである。 As a seismic reinforcement measure for existing buildings with insufficient seismic performance, it is widely practiced to add a seismic wall inside the building. In that case, it is necessary to structurally and reliably integrate the newly installed earthquake resistant wall with respect to the existing housing, and a joint structure as shown in Patent Document 1 or Patent Document 2 has been proposed as a structure therefor.
In these cases, a reinforced concrete seismic wall is built inside a frame (frame) with columns and beams in an existing reinforced concrete building, and a precast concrete cotter is bonded to the surface of the beam. Thus, the shear force is transmitted between the existing frame and the newly installed earthquake-resistant wall through the cotter.

また、既存建物を免震建物に改修することも広く普及する気運にあり、そのための免震化工法として特許文献３に示されるものが提案されている。これは、既存基礎の下方地盤を掘り下げて既存杭の杭頭部に新設基礎を一体に設け、新設基礎上に設置した免震装置により建物全体を免震支持するというものであり、既存杭と新設基礎とを構造的に一体化させるために既存杭にスタッドを取り付けた鋼管を装着するようにしたものである。
特開平９−２６８７７０号公報 特開平９−２６８７７１号公報 特開２０００−３２８５８５号公報 In addition, renovation of an existing building to a base-isolated building is also in widespread use, and a method shown in Patent Document 3 has been proposed as a seismic isolation method for that purpose. This is to dig down the lower ground of the existing foundation, integrally install a new foundation on the pile head of the existing pile, and to support the entire building with the seismic isolation device installed on the new foundation. In order to structurally integrate the new foundation, steel pipes with studs attached to existing piles are installed.
JP-A-9-268770 Japanese Patent Laid-Open No. 9-268771 JP 2000-328585 A

特許文献１〜２に示されるようなコッタを用いて新設の耐震壁を既存の梁や柱に対して接合することは、特殊なプレキャストコンクリート製のコッタを必要とすることからそのために少なからぬコストを要するものであるし、またコッタの他にも接合鉄筋を併用することが通常であるので接合部の収まりが複雑であり、施工性にも難があった。
また、特許文献３に示されるような構造で新設基礎を既存杭に接合する場合も、スタッド付きの特殊な鋼管を用いることからコスト高であり、施工も面倒である。 Joining a new earthquake-resistant wall to existing beams and columns using a cotter as shown in Patent Documents 1 and 2 requires a special precast concrete cotter, so there is a considerable cost. In addition to the cotter, it is common to use jointed reinforcing bars together, so the fitting of the joints is complicated and the workability is also difficult.
Moreover, also when joining a newly installed foundation to the existing pile with a structure as shown in patent document 3, since a special steel pipe with a stud is used, cost is high and construction is also troublesome.

このように、従来においては既設のコンクリート部材に対して新設のコンクリート部材に一体化させるためにはそれぞれに対応する特殊な接合部材を必要とし、したがっていずれもコストや施工性の点で難があり、そのため既設のコンクリート部材に対して新設のコンクリート部材を接合する場合全般に広く適用可能な有効適切な接合手法の開発が望まれていた。   As described above, conventionally, in order to integrate an existing concrete member with a new concrete member, a special joint member corresponding to each is required. Therefore, both of them are difficult in terms of cost and workability. Therefore, there has been a demand for the development of an effective and appropriate joining technique that can be widely applied to existing concrete members when joining new concrete members to existing concrete members.

上記事情に鑑み、本発明は、既設のコンクリート部材に対して新設のコンクリート部材をせん断力伝達可能に接合するための接合方法であって、既設のコンクリート部材の表面にエポキシ樹脂を塗布するとともにその表面を櫛目状に形成して硬化させることにより、接合面に硬化エポキシ樹脂からなる櫛目状の係合層を一体に固着せしめた状態で形成した後、新設のコンクリート部材を形成するためのコンクリートを打設することにより、双方のコンクリート部材の間に前記係合層を介在させた状態で新設のコンクリート部材を形成することを特徴とする。   In view of the above circumstances, the present invention is a joining method for joining a new concrete member to an existing concrete member so that shearing force can be transmitted, and applying an epoxy resin to the surface of the existing concrete member After the surface is formed in a comb shape and cured, a concrete for forming a new concrete member is formed after forming a comb-like engagement layer made of a cured epoxy resin integrally bonded to the joint surface. By placing, a new concrete member is formed with the engagement layer interposed between the two concrete members.

本発明は、既設のコンクリート部材としての梁や柱に対して新設のコンクリート部材としての耐震壁を接合する場合、あるいは、既設のコンクリート部材としての杭に対して新設のコンクリート部材としての基礎を接合する場合に好適に採用可能である。   In the present invention, when a seismic wall as a new concrete member is joined to a beam or a column as an existing concrete member, or a foundation as a new concrete member is joined to a pile as an existing concrete member. In this case, it can be preferably used.

本発明によれば、新設のコンクリート部材としての耐震壁や基礎等を形成するに際して、既設のコンクリート部材としての梁や柱、杭等の表面に予め硬化エポキシ樹脂による櫛目状の係合層を形成することのみで、新設するべきコンクリート部材を既設のコンクリート部材に対してせん断力を伝達可能な状態で施工することができ、それらの構造的な一体化を充分に図ることができる。また、係合層の形成は汎用の安価なエポキシ樹脂を塗布して櫛目状に均すことのみで極めて容易にかつ単純作業により行うことができるし、新設のコンクリート部材の施工は在来どうりで良いから、何等特殊な接合部材や面倒な手間を必要とするものでもなく、したがって従来に比べてコンクリート部材を新設するに関わる作業を遙かに安価にかつ効率的に実施することができ、施工性を充分に改善することができる。   According to the present invention, when forming a seismic wall or foundation as a new concrete member, a comb-like engagement layer is formed in advance on the surfaces of beams, columns, piles, etc. as existing concrete members. Only by doing this, it is possible to construct a concrete member to be newly installed in a state in which a shearing force can be transmitted to the existing concrete member, and the structural integration thereof can be sufficiently achieved. In addition, the engagement layer can be formed easily and simply by applying a general-purpose inexpensive epoxy resin and leveling it into a comb-like shape. Therefore, it does not require any special joining member or troublesome work, so the work related to newly installing a concrete member can be carried out much cheaper and more efficiently than before, Workability can be improved sufficiently.

本発明の第１実施形態を図１〜図２に示す。これは鉄筋コンクリート造の既存建物における梁１と柱２とによる躯体フレームの内側に、鉄筋コンクリート造の頑強な耐震壁３を新設する場合の適用例であって、新設する耐震壁３と既設の梁１と柱２との間に櫛目状の係合層４を介在させることによってその係合層４によりせん断力を伝達可能としたものであり、特にその係合層４をエポキシ樹脂により形成することを主眼とするものである。   A first embodiment of the present invention is shown in FIGS. This is an application example in the case of newly installing a strong reinforced concrete earthquake-resistant wall 3 inside the frame of the beam 1 and the column 2 in an existing reinforced concrete structure. The newly installed earthquake-resistant wall 3 and the existing beam 1 By interposing a comb-like engagement layer 4 between the column and the pillar 2, shearing force can be transmitted by the engagement layer 4, and in particular, the engagement layer 4 is formed of an epoxy resin. The main focus.

すなわち、本実施形態においては、耐震壁３を施工するに先立ち、その耐震壁３を接合するべき梁１の上面と下面および柱２の表面にパテ状のエポキシ樹脂を所定厚さで塗布し、その表面をたとえば櫛刃状の均し具のような適宜の器具によって櫛目状に均して硬化させることにより、櫛目状の硬化エポキシ樹脂からなる係合層４を梁１と柱２の表面に一体に固着させた状態で形成する。
それら係合層４の櫛目の方向は、梁１の上面および下面に形成するものにおいては図１（ｂ）に示すように梁幅方向とし、柱２の表面に形成するものとしては図１（ｄ）に示すように柱の長さ方向（上下方向）とする。
また、係合層４における櫛目の形状や寸法は特に限定されないが、たとえば（ｅ）に示すように断面正三角形状の突条４ａを連続的に形成した形態のものが好適であり、各突条４ａの断面における一辺の長さｄは２５ｍｍ程度で良い。 That is, in this embodiment, prior to constructing the earthquake resistant wall 3, putty-like epoxy resin is applied to the upper and lower surfaces of the beam 1 to be joined to the earthquake resistant wall 3 and the surface of the column 2 with a predetermined thickness, The engagement layer 4 made of a comb-like cured epoxy resin is applied to the surfaces of the beam 1 and the column 2 by leveling and hardening the surface in a comb-like shape with an appropriate tool such as a comb-blade leveling tool. It is formed in a state of being integrally fixed.
The direction of the combs of the engagement layers 4 is the beam width direction as shown in FIG. 1 (b) when formed on the upper and lower surfaces of the beam 1, and as shown in FIG. As shown in d), the length direction of the column (vertical direction).
Further, the shape and dimensions of the combs in the engagement layer 4 are not particularly limited. For example, as shown in (e), the shape in which the protrusions 4a having a regular triangular cross section are continuously formed is preferable. The length d of one side in the cross section of the strip 4a may be about 25 mm.

上記の係合層４を形成した後、その内側に壁配筋と壁型枠（いずれも図示せず）とを組み立て、コンクリートを打設して耐震壁３を形成する。これにより、形成された耐震壁３の周囲と梁１、柱２との間には自ずと上記の係合層４が介在したものとなり、したがって耐震壁３は梁１、柱２に対して係合層４を介してせん断力を相互に伝達可能な状態で係合することになる。特に、梁１に形成した係合層４によって耐震壁３の面内方向のせん断力が効率的に伝達され、柱２に形成した係合層４によって面外方向のせん断力が効率的に伝達されることになる。   After the engagement layer 4 is formed, a wall reinforcement and a wall formwork (both not shown) are assembled on the inner side, and concrete is placed to form the earthquake resistant wall 3. As a result, the engagement layer 4 is naturally interposed between the periphery of the formed earthquake-resistant wall 3 and the beam 1 and the column 2, so that the earthquake-resistant wall 3 is engaged with the beam 1 and the column 2. The shearing forces are engaged with each other through the layer 4 in a state where they can be transmitted to each other. In particular, the shearing force in the in-plane direction of the earthquake-resistant wall 3 is efficiently transmitted by the engagement layer 4 formed on the beam 1, and the shearing force in the out-of-plane direction is efficiently transmitted by the engagement layer 4 formed on the column 2. Will be.

以上のように、本実施形態によれば、耐震壁３の形成に際して梁１と柱２の表面に予め硬化エポキシ樹脂による櫛目状の係合層４を形成することのみで、新設するべき耐震壁３を梁１と柱２に対してせん断力を面内方向および面外方向のいずれについても効率的に伝達可能な状態で施工することができ、したがってそれらの構造的な一体化を充分に図ることができる。
そして、係合層４の形成は汎用の安価なエポキシ樹脂を塗布して適宜の器具により櫛目状に均すことのみで極めて容易にかつ単純作業により行うことができるし、耐震壁３自体の施工は在来どうりで良く、また特許文献１〜２に示されるような特殊なコッタを用いたり、あるいは壁筋を梁１や柱２に対してアンカーするような必要もないから、従来に比べて全体の施工を遙かに安価にかつ効率的に実施でき、施工性を大きく改善することができる。 As described above, according to the present embodiment, the seismic wall to be newly provided is formed only by forming the comb-like engagement layer 4 of the cured epoxy resin in advance on the surfaces of the beam 1 and the column 2 when the seismic wall 3 is formed. 3 can be applied to the beam 1 and the column 2 in a state where the shearing force can be efficiently transmitted in both the in-plane direction and the out-of-plane direction. be able to.
The engagement layer 4 can be formed easily and simply by applying a general-purpose inexpensive epoxy resin and leveling it into a comb shape with an appropriate tool. Can be conventional, and it is not necessary to use a special cotter as shown in Patent Documents 1 or 2 or to anchor the wall bars to the beam 1 or the column 2. Therefore, the entire construction can be carried out much cheaper and efficiently, and the workability can be greatly improved.

なお、上記実施形態のように、梁１に形成する係合層４と柱２に形成する係合層４とでは櫛目の向きを変えることで面内方向と面外方向のせん断力をそれらの係合層４により独立に伝達する構成とすることでも良いが、それに代えて、図２（ａ）に示すように梁１や柱２の幅方向に沿う櫛目と長さ方向に沿う櫛目とを交互に形成する（換言すれば、図１（ｅ）に示したような突状４ａの向きを適宜の間隔で交互に変更する）したり、あるいは図２（ｂ）に示すように梁１や柱２に対して互いに逆方向に傾斜する方向の櫛目を交互に形成することでも良く、それにより同時に両方向のせん断力伝達機能を有するものとなる。いずれにしても、両方向の櫛目は均等に形成することでも良いが、図２（ａ）に示す例のように両者に差をもたせる（図示例では幅方向の櫛目を長さ方向の櫛目の２倍程度に多く形成している）ことにより、各方向のせん断力伝達機能を制御することも可能である。   As in the above-described embodiment, the engagement layer 4 formed on the beam 1 and the engagement layer 4 formed on the column 2 change the direction of the comb lines to change the shear force in the in-plane direction and the out-of-plane direction. Alternatively, the engagement layer 4 may be configured to transmit independently, but instead, as shown in FIG. 2A, a comb line along the width direction of the beam 1 or the column 2 and a comb line along the length direction are provided. They are alternately formed (in other words, the direction of the protrusions 4a as shown in FIG. 1 (e) is alternately changed at appropriate intervals), or as shown in FIG. It is also possible to alternately form combs in directions opposite to each other with respect to the pillar 2, thereby simultaneously having a shearing force transmission function in both directions. In any case, the combs in both directions may be formed equally, but a difference is made between the two as in the example shown in FIG. 2A (in the illustrated example, the combs in the width direction are 2 in the length direction). It is also possible to control the shear force transmission function in each direction.

図３は本発明の第２実施形態を示す。これは既存建物の免震化に際して既設の杭５の杭頭部に新設の基礎６を形成する場合の適用例であって、基礎６の施工に先立って杭５の杭頭部周面に第１実施形態と同様に硬化エポキシ樹脂からなる櫛目状の係合層７を予め形成するようにしたものである。これによれば、係合層４により新設の基礎６と既設の杭５との間でせん断力を有効に伝達可能であり、特許文献３に示されるような特殊な接合部材を用いる場合に比べてコスト削減と施工性改善を充分に図ることができる。   FIG. 3 shows a second embodiment of the present invention. This is an application example in the case where a new foundation 6 is formed on the pile head of the existing pile 5 for seismic isolation of the existing building. As in the first embodiment, the comb-like engagement layer 7 made of a cured epoxy resin is formed in advance. According to this, the shear force can be effectively transmitted between the newly established foundation 6 and the existing pile 5 by the engagement layer 4, compared with a case where a special joining member as shown in Patent Document 3 is used. Therefore, cost reduction and workability improvement can be sufficiently achieved.

以上で本発明の実施形態を説明したが、上記各実施形態はあくまで好適な一例に過ぎず、本発明は耐震壁や基礎を新設する場合に限らず、様々な用途、形態、規模の新設コンクリート部材を既設コンクリート部材に対してせん断力を伝達可能な状態で接合する必要のある場合全般に広く適用できるものである。そして、硬化エポキシ樹脂からなる櫛目状の係合層の具体的な形態やその形成手法は、本発明の要旨を逸脱しない範囲内であれば、接合部の形状や要求される接合強度その他の条件を考慮して適宜の設計的変形や応用が可能であることは言うまでもない。   Although the embodiment of the present invention has been described above, each of the above embodiments is merely a preferable example, and the present invention is not limited to the case where a seismic wall or foundation is newly installed, but is a new concrete having various uses, forms, and scales. The present invention can be widely applied to cases where it is necessary to join a member to an existing concrete member in a state where shearing force can be transmitted. If the specific form of the comb-like engagement layer made of a cured epoxy resin and the formation method thereof are within the scope of the present invention, the shape of the joint, the required joint strength, and other conditions Needless to say, appropriate design modifications and applications are possible.

本発明を既設の梁と柱に対して新設の耐震壁を接合する場合に適用した第１実施形態を示す図である。It is a figure which shows 1st Embodiment applied to the case where this invention joins a new earthquake-resistant wall with respect to the existing beam and column. 同、係合層の他の例を示す図である。It is a figure which shows the other example of an engagement layer equally. 本発明を既設の杭に対して新設の基礎を接合する場合に適用した第２実施形態をを示す図である。It is a figure which shows 2nd Embodiment applied when joining this invention with the existing foundation with respect to the existing pile.

符号の説明Explanation of symbols

１ 梁（既設のコンクリート部材）
２ 柱（既設のコンクリート部材）
３ 耐震壁（新設のコンクリート部材）
４ 係合層
４ａ 突条
５ 杭（既設のコンクリート部材）
６ 基礎（新設のコンクリート部材）
７ 係合層 1 Beam (existing concrete member)
2 pillars (existing concrete members)
3 earthquake-resistant wall (new concrete member)
4 engagement layer 4a ridge 5 pile (existing concrete member)
6 Foundation (Concrete material)
7 Engagement layer

Claims (3)

既設のコンクリート部材に対して新設のコンクリート部材をせん断力伝達可能に接合するための接合方法であって、
既設のコンクリート部材の表面にエポキシ樹脂を塗布するとともにその表面を櫛目状に形成して硬化させることにより、接合面に硬化エポキシ樹脂からなる櫛目状の係合層を一体に固着せしめた状態で形成した後、新設のコンクリート部材を形成するためのコンクリートを打設することにより、双方のコンクリート部材の間に前記係合層を介在させた状態で新設のコンクリート部材を形成することを特徴とするコンクリート部材の接合方法。 A joining method for joining a new concrete member to an existing concrete member so that shearing force can be transmitted,
By applying epoxy resin to the surface of an existing concrete member and forming the surface into a comb-like shape and curing it, it is formed with a comb-like engagement layer made of cured epoxy resin fixed integrally on the joint surface After that, the concrete for forming the new concrete member is cast to form the new concrete member with the engagement layer interposed between the two concrete members. Member joining method. 請求項１記載のコンクリート部材の接合方法であって、
既設のコンクリート部材である梁と柱の表面にエポキシ樹脂を塗布するとともにその表面を櫛目状に形成して硬化させることにより、新設のコンクリート部材である耐震壁を接合するべき接合面に硬化エポキシ樹脂からなる櫛目状の係合層を梁と柱に一体に固着せしめた状態で形成した後、耐震壁を形成するためのコンクリートを打設することにより、梁および柱との間に前記係合層を介在させた状態で耐震壁を形成することを特徴とするコンクリート部材の接合方法。 A method for joining concrete members according to claim 1,
Epoxy resin is applied to the surfaces of existing concrete members such as beams and columns, and the surface is formed into a comb shape and hardened to cure the epoxy resin on the joint surface to which the seismic wall, which is a new concrete member, is to be joined. After the comb-like engagement layer made of is fixed to the beam and the column integrally, the engagement layer is formed between the beam and the column by placing concrete for forming the earthquake-resistant wall. A method for joining concrete members, characterized in that a seismic wall is formed in a state of interposing a metal. 請求項１記載のコンクリート部材の接合方法であって、
既設のコンクリート部材である杭の周面にエポキシ樹脂を塗布するとともにその表面を櫛目状に形成して硬化させることにより、新設のコンクリート部材である基礎を接合するべき接合面に硬化エポキシ樹脂からなる櫛目状の係合層を杭頭部に一体に固着せしめた状態で形成した後、基礎を形成するためのコンクリートを打設することにより、杭の周面との間に前記係合層を介在させた状態で基礎を形成することを特徴とするコンクリート部材の接合方法。 A method for joining concrete members according to claim 1,
The epoxy resin is applied to the peripheral surface of the pile, which is an existing concrete member, and the surface is formed in a comb shape and cured, so that the joint surface to be joined to the foundation, which is a new concrete member, is made of a cured epoxy resin. After the comb-like engagement layer is integrally fixed to the pile head, the engagement layer is interposed between the periphery of the pile by placing concrete to form the foundation. A method for joining concrete members, characterized in that the foundation is formed in a state of being allowed to stand.
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JP2010106490A (en) * 2008-10-29 2010-05-13 Toda Constr Co Ltd Method of manufacturing precast concrete plate

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JPH09170339A (en) * 1995-12-21 1997-06-30 Taisei Corp Base isolation method for existing building
JP2000274045A (en) * 1999-03-26 2000-10-03 Asahi Chem Ind Co Ltd Finishing structure for reinforcing concrete member
JP2002129752A (en) * 2000-10-24 2002-05-09 Kajima Corp Construction method for structural part
JP2003278385A (en) * 2002-03-20 2003-10-02 Kawada Industries Inc Construction method of concrete structure

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JPH09170339A (en) * 1995-12-21 1997-06-30 Taisei Corp Base isolation method for existing building
JP2000274045A (en) * 1999-03-26 2000-10-03 Asahi Chem Ind Co Ltd Finishing structure for reinforcing concrete member
JP2002129752A (en) * 2000-10-24 2002-05-09 Kajima Corp Construction method for structural part
JP2003278385A (en) * 2002-03-20 2003-10-02 Kawada Industries Inc Construction method of concrete structure

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010106490A (en) * 2008-10-29 2010-05-13 Toda Constr Co Ltd Method of manufacturing precast concrete plate

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