JP4555648B2

JP4555648B2 - Bearing wall structure

Info

Publication number: JP4555648B2
Application number: JP2004277842A
Authority: JP
Inventors: 哲日下
Original assignee: Takenaka Corp
Current assignee: Takenaka Corp
Priority date: 2004-09-24
Filing date: 2004-09-24
Publication date: 2010-10-06
Anticipated expiration: 2024-09-24
Also published as: JP2006090039A

Description

本発明は、鉄筋コンクリート造の耐力壁において、コンクリートの乾燥収縮によって生じるひび割れを特定の箇所に集中させるように溝状のひび割れ誘発目地を形成してある耐力壁構造に関する。 The present invention relates to a load-bearing wall structure in which a groove-like crack-inducing joint is formed in a load-bearing wall made of reinforced concrete so that cracks caused by drying shrinkage of the concrete are concentrated at specific locations.

従来、コンクリートのひび割れを前記ひび割れ誘発目地に集中させることを目的に考えられたこの種の耐力壁構造としては、一つ目には、ひび割れ誘発目地そのものの幅寸法や、深さ寸法を大きく確保してあるものや、二つ目には、図５に示すように、前記ひび割れ誘発目地１を形成してある耐力壁Ｗ部分の壁肉厚内に、目地に沿って塩ビパイプ２０を埋設して、実質的なコンクリート４の有効断面を少なくしてひび割れを誘発しようとするものや、三つ目には、図６に示すように、前記ひび割れ誘発目地１を形成してある耐力壁Ｗ部分の壁肉厚内に、目地に沿って金属製の帯板や山形鋼等の遮断部材２１を埋設しておき、コンクリートの乾燥収縮に伴って、前記遮断部材２１とコンクリート４とが接触面で剥離することでコンクリート４の他部でのひび割れ防止を図ろうとするものがあった（例えば、特許文献１参照）。 Conventionally, this type of load-bearing wall structure, which was designed to concentrate concrete cracks on the crack-inducing joints, has a large width and depth dimensions. As shown in FIG. 5, a PVC pipe 20 is embedded along the joint in the wall thickness of the bearing wall W where the crack-inducing joint 1 is formed. As shown in FIG. 6, the load bearing wall W portion where the crack-inducing joint 1 is formed is intended to induce cracks by reducing the effective cross section of the concrete 4 substantially. A barrier member 21 such as a metal strip or angle steel is embedded along the joint, and the barrier member 21 and the concrete 4 are brought into contact with each other as the concrete shrinks and shrinks. By peeling off the concrete 4 It was something to attempt is made cracking prevention in parts (e.g., see Patent Document 1).

特開平１０−３７３２０号公報（図１、図２）JP-A-10-37320 (FIGS. 1 and 2)

上述した従来の一つ目や二つ目の耐力壁構造によれば、壁としての断面欠損が大きくなって強度低下を招き易い問題点がある。
また、上述した従来の三つ目の耐力壁構造によれば、遮断部材とコンクリートの付着によって充分なひび割れ誘発効果が得られない問題点がある。 According to the conventional first and second load-bearing wall structures described above, there is a problem in that a cross-sectional defect as a wall becomes large and the strength is likely to decrease.
In addition, according to the conventional third load-bearing wall structure described above, there is a problem that a sufficient crack inducing effect cannot be obtained due to adhesion between the blocking member and the concrete.

従って、本発明の目的は、上記問題点を解消し、壁としての所定の断面を確保できながら、コンクリートの乾燥収縮に伴うひび割れ誘発効果を得易い耐力壁構造を提供するところにある。 Accordingly, an object of the present invention is to provide a load-bearing wall structure that can easily obtain a cracking induction effect associated with drying shrinkage of concrete while eliminating the above-mentioned problems and ensuring a predetermined cross section as a wall.

本発明の第１の特徴構成は、鉄筋コンクリート造の耐力壁に、溝状のひび割れ誘発目地を形成してある耐力壁構造において、前記ひび割れ誘発目地を形成してある耐力壁部分の壁肉厚内に、目地を境として分離自在な状態で対向する一対の縁部材が埋設してあり、前記縁部材は、互いの対向面に、互いが対向方向に離間する動きは阻害せずに、互いが対向面に沿って相対移動する動きに抵抗する噛み合わせ部が形成してあるところにある。 A first characteristic configuration of the present invention is a load bearing wall structure in which a groove-shaped crack-inducing joint is formed in a reinforced concrete bearing wall, and within the wall thickness of the load-bearing wall portion in which the crack-inducing joint is formed. to, Thea embedded pair of edge member opposed by detachably state as a boundary the joint is, the edge member is on the opposite surface of each other, without inhibiting the movement of each other are separated in opposite directions, each other there is relative movement to engagement portion is formed that resists movement Thea Rutokoro along the facing surface.

本発明の第１の特徴構成によれば、前記ひび割れ誘発目地を形成してある耐力壁部分の壁肉厚内に、目地を境として分離自在な状態で対向する一対の縁部材が埋設してあるから、目地部分には前記一対の縁部材が位置しており、従来のように耐力壁内に断面欠損が生じると言ったことを防止できながら、コンクリートの乾燥収縮が発生するに伴って前記一対の縁部材どうしは、目地を境として分離方向に移動して収縮を吸収することができ、ひび割れ誘発目地以外のコンクリートにひび割れができるのを未然に防止することが可能となる。
また、両縁部材の噛み合わせ部どうしの噛み合わせに伴って、両縁部材が対向方向に離間する動きは阻害されない状態で、且つ、互いが対向面に沿って相対移動する動きに抵抗をする効果が生じる。即ち、両縁部材が対向方向に離間する動きは阻害されないから、上述のひび割れ誘発効果を発揮できながら、前記対向面に沿った外力を互いの縁部材どうしの噛み合わせで伝達しあって応力負担することが可能となる。その結果、壁コンクリートと両縁部材とが一体となって応力負担することができ、壁強度の向上を図ることが可能となる。 According to the first characteristic configuration of the present invention, a pair of edge members facing each other in a separable state with the joint as a boundary are embedded in the wall thickness of the load bearing wall portion forming the crack-inducing joint. Therefore, the pair of edge members are located in the joint portion, and it is possible to prevent the occurrence of a cross-sectional defect in the load bearing wall as in the prior art, while the dry shrinkage of the concrete occurs as described above. The pair of edge members can move in the separation direction with the joint as a boundary to absorb the shrinkage, and can prevent the concrete other than the crack-induced joint from cracking.
In addition, as the meshing portions of the two edge members engage with each other, the movement of the two edge members apart in the opposing direction is not hindered, and resists the movement of the two members relative to each other along the opposing surface. An effect is produced. That is, since the movement of the edge members in the opposite direction is not hindered, the external force along the opposite surface is transmitted by the engagement of the edge members and the stress load is achieved while the above-described cracking induction effect can be exhibited. It becomes possible to do. As a result, the wall concrete and both edge members can be subjected to stress as a unit and the wall strength can be improved.

本発明の第２の特徴構成は、前記縁部材は、少なくともコンクリートと同等の強度を有しているところにある。 According to a second characteristic configuration of the present invention, the edge member has at least a strength equal to that of concrete.

本発明の第２の特徴構成によれば、本発明の第１の特徴構成による上述の作用効果を叶えることができるのに加えて、耐力壁としての強度を前記縁部材によっても担うことができ、壁の強度低下を防止することができる。 According to the second characteristic configuration of the present invention, in addition to being able to achieve the above-described operational effects of the first characteristic configuration of the present invention, the edge member can also bear the strength as a load bearing wall. , Wall strength can be prevented from lowering.

本発明の第３の特徴構成は、前記縁部材は、互いの対向面どうしは平滑面として仕上げてあると共に、壁コンクリートとの接触面は、粗面として仕上げてあるところにある。 According to a third characteristic configuration of the present invention, the edge member is finished as a smooth surface between mutually facing surfaces, and a contact surface with the wall concrete is finished as a rough surface.

本発明の第３の特徴構成によれば、本発明の第１又は２の特徴構成による上述の作用効果を叶えることができるのに加えて、縁部材は粗面に仕上げられた面が壁コンクリートと接触していることで壁コンクリートとの一体性がより高くなり、壁コンクリートと一体となって外力を受けることができるから壁の強度の維持を図ることが可能となる。
一方、当接させた縁部材どうしの対向面は共に平滑面として仕上げてあるから、縁部材間に隙間が発生し難く、両縁部材どうしをより気密な状態に当接させることが可能となる。従って、壁コンクリートの打設時に縁部材間にセメント分が進入するのを防止し易くなる。即ち、対向面どうしを平滑面にして当接させておくことで、両縁部材間にセメント分が進入して両縁部材の分離の障害となってしまうことを防止でき、両縁部材どうしのスムースな分離を叶えることが可能となる。その結果、上述のひび割れ誘発効果をより確実に発揮することが可能となる。 According to the third characteristic configuration of the present invention, in addition to being able to achieve the above-described operational effects according to the first or second characteristic configuration of the present invention, the edge member has a roughened surface as wall concrete. The contact with the wall concrete makes it more integrated with the wall concrete and can receive external force together with the wall concrete, so that the strength of the wall can be maintained.
On the other hand, since the opposing surfaces of the abutted edge members are both finished as smooth surfaces, it is difficult for gaps to occur between the edge members, and it is possible to bring the two edge members into a more airtight state. . Therefore, it becomes easy to prevent cement from entering between the edge members when placing the wall concrete. That is, by making the opposing surfaces smooth and abutting each other, it is possible to prevent cement from entering between the two edge members and hindering separation of the two edge members. It is possible to achieve smooth separation. As a result, the above-described crack inducing effect can be more reliably exhibited.

以下に本発明の実施の形態を図面に基づいて説明する。尚、図面において従来例と同一の符号で表示した部分は、同一又は相当の部分を示している。 Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the parts indicated by the same reference numerals as those in the conventional example indicate the same or corresponding parts.

図１、図２は、本発明の耐力壁構造を取り入れた耐力壁Ｗの一実施形態を示すもので、耐力壁Ｗは、鉄筋コンクリート造の建物の一部に形成されている。
そして、本実施形態における耐力壁Ｗは、その表裏面に、溝状の複数のひび割れ誘発目地（以後、単に目地という）１を、縦配置で横間隔をあけた状態にそれぞれ設けられているものを例として挙げている。 1 and 2 show an embodiment of a load-bearing wall W incorporating the load-bearing wall structure of the present invention. The load-bearing wall W is formed in a part of a reinforced concrete building.
The bearing walls W according to the present embodiment are provided with a plurality of groove-shaped crack-inducing joints (hereinafter simply referred to as joints) 1 on the front and rear surfaces thereof in a vertically arranged state with a lateral interval. Is given as an example.

耐力壁Ｗ内には、図に示すように、鉄筋２が配置され、その内側には、目地１を境として分離自在な状態で対向する一対の縁部材３が埋設してある。 As shown in the figure, a reinforcing bar 2 is arranged in the load bearing wall W, and a pair of edge members 3 facing each other in a separable state with the joint 1 as a boundary are embedded in the inside thereof.

前記目地１は、図に示すように、「Ｖ」字型断面の溝によって構成してあり、例えば、型枠に「Ｖ」字型断面の桟木を予め固定した状態で型枠内の空間にコンクリート４を打設し、所定の期間の経過後に脱型すれば前記桟木部分跡に前記目地１が形成される。 As shown in the figure, the joint 1 is constituted by a groove having a “V” -shaped cross section. For example, a joint with a “V” -shaped cross section is fixed in advance to a space in the mold frame. If the concrete 4 is cast and removed after a predetermined period of time, the joint 1 is formed on the pier part trace.

また、前記縁部材３は、図に示すように、プレキャストコンクリートからなる矩形断面の長尺体によって構成されており、前記耐力壁Ｗの表裏の目地１における溝底部どうしを結ぶ面内に、一対の縁部材３どうしの合わせ面が位置する状態に配置されている。
そして、一対の縁部材３は、互いの対向面どうしは平滑面で且つ平坦面として仕上げてあると共に、コンクリート４との接触面となる他の面は、凸凹を設けた粗面として仕上げてある。
従って、両縁部材３どうしを前記平滑・平坦な対向面どうしが接当する状態に合わせることで、合わせ目に隙間が出来難く、型枠内の所定位置に両縁部材３をセットした状態でコンクリート４を打設しても、両縁部材３の合わせ目には進入し難い。
一方、合わさった両縁部材３の外周面は粗面として仕上げられているから、打設されたコンクリート４は両縁部材３の外周面凸凹に沿って埋め尽くされ、コンクリートと両縁部材との高い接着強度が確保される。 Moreover, the said edge member 3 is comprised by the elongate body of the rectangular cross section which consists of precast concrete, as shown in a figure, and in a surface which connects the groove bottom parts in the joint 1 of the front and back of the said load-bearing wall W, a pair Are arranged in a state where the mating surfaces of the edge members 3 are positioned.
The pair of edge members 3 are finished as smooth surfaces and flat surfaces between the opposing surfaces, and the other surfaces serving as contact surfaces with the concrete 4 are finished as rough surfaces provided with irregularities. .
Therefore, by matching the two edge members 3 to the state where the smooth and flat opposing surfaces are in contact with each other, it is difficult to form a gap at the joint, and the both edge members 3 are set at predetermined positions in the mold. Even if the concrete 4 is placed, it is difficult to enter the joint of both edge members 3.
On the other hand, since the outer peripheral surfaces of the combined two-edge members 3 are finished as rough surfaces, the placed concrete 4 is filled up along the irregularities of the outer peripheral surfaces of the two-edge members 3, and the concrete and the two-edge members High adhesive strength is ensured.

よって、通常状態においては、当該耐力壁Ｗは、コンクリート４・両縁部材３・鉄筋２が一丸となって外力を受けることが出来、所定の壁強度を発揮することが可能となる。そして、コンクリート４の乾燥収縮が進むに伴って、その応力が、前記目地１での変位によって吸収され、コンクリートのひび割れが随所に現れるのを防止することが可能となる。
即ち、図２に示すように、両縁部材３は、コンクリート４と強力に接着されているものの、両縁部材３どうしは、単に、対向面どうしが合わさっているに他ならないから、コンクリート４の乾燥収縮による歪みを、両縁部材３どうしが離間することで吸収することが可能となるわけである。 Therefore, in the normal state, the load-bearing wall W can receive the external force with the concrete 4, the both edge members 3, and the reinforcing bars 2 being united, and can exhibit a predetermined wall strength. As the drying and shrinkage of the concrete 4 progresses, the stress is absorbed by the displacement at the joint 1 and it is possible to prevent the cracks of the concrete from appearing everywhere.
That is, as shown in FIG. 2, the edge members 3 are strongly bonded to the concrete 4, but the edge members 3 are nothing more than the opposing surfaces being joined together. The distortion due to drying shrinkage can be absorbed by separating the two edge members 3 from each other.

このように、当該実施形態の耐力壁構造によれば、目地１以外の壁部分に乾燥収縮によるクラックが発生し難くでき、しかも、壁としての強度は、所定の値を維持し易いものである。 Thus, according to the load-bearing wall structure of the present embodiment, cracks due to drying shrinkage can hardly occur in the wall portion other than the joint 1, and the strength as the wall can be easily maintained at a predetermined value. .

〔別実施形態〕
以下に他の実施の形態を説明する。 [Another embodiment]
Other embodiments will be described below.

〈１〉前記ひび割れ誘発目地１は、先の実施形態で説明した縦目地に限るものではなく、例えば、横目地や、傾斜した目地であってもよい。それらを含めてひび割れ誘発目地と総称する。
〈２〉前記縁部材３は、先の実施形態で説明したプレキャストコンクリート製のものに限るものではなく、例えば、金属製や、合成樹脂製や、セラミックス製等であってもよい。また、形状に関しては、矩形断面形状に限るものではなく、各種断面形状（平板や、アングル、チャンネル、Ｈ型等）を採用することが可能である。
また、対向面どうしは、平滑面として構成するものに限らず、多少の凹凸がある粗面であってもよく、この場合には、両縁部材３の対向面間に、予め、離型材等を塗布充填しておけば、コンクリートの進入防止を図り易くなると共に、両縁部材３どうしの離間移動をスムースに許容できるようになる。勿論、離型材は、先の実施形態において使用することも可能である。
また、対向面どうしは、先の実施形態で説明した平坦面として構成することに限らず、例えば、図３の壁正面視説明図に示すように、一対の縁部材３の互いの対向面を、ジグザグ状に噛み合わさる形状に形成した噛み合わせ部５として構成してあってもよく、この場合、壁に作用する上下方向の外力を前記噛み合わせ部５で伝達し合い、より一体的に応力負担することが可能となる。但し、噛み合わせ部５は、壁正面視においてジグザグとなる形状に限るものではなく、例えば、壁上面視においてジグザグとなる形状や、それらの組み合わせ等が考えられるが、要するに、両縁部材３互いが対向方向に離間する動きは阻害せずに、互いが対向面に沿って相対移動する動きに抵抗するように形成されたものであればよい。
〈３〉前記縁部材３は、先の実施形態で説明したように互いが直接的に接触するように構成することに限らず、例えば、図４に示すように、離間する両縁部材３間に介在して隙間を閉塞する閉塞部材６を介して接当するように構成することも可能である。この場合、コンクリートの乾燥収縮に伴って目地１が目開きしたとしても、前記閉塞部材６によって壁表裏に目地が貫通するのを防止することが可能となる。
閉塞部材６の具体的な構成は、例えば、シート状のものを両縁部材３間に折り畳んだ状態に設けておいたり、弾性変形自在な介在層を両縁部材３に接着しておくような構成を採用することができる。 <1> The crack inducing joint 1 is not limited to the vertical joint described in the previous embodiment, and may be, for example, a horizontal joint or an inclined joint. These are collectively referred to as crack-induced joints.
<2> The edge member 3 is not limited to the one made of precast concrete described in the previous embodiment, and may be made of metal, synthetic resin, ceramics, or the like. Further, the shape is not limited to the rectangular cross-sectional shape, and various cross-sectional shapes (a flat plate, an angle, a channel, an H shape, etc.) can be adopted.
Further, the opposing surfaces are not limited to being configured as smooth surfaces, and may be rough surfaces with some unevenness. In this case, a release material or the like is provided between the opposing surfaces of both edge members 3 in advance. If it is applied and filled, it becomes easy to prevent the concrete from entering, and it is possible to smoothly allow the separation between the two edge members 3. Of course, the release material can also be used in the previous embodiment.
Further, the opposing surfaces are not limited to being configured as the flat surfaces described in the previous embodiment. For example, as shown in the front view of the wall in FIG. Further, it may be configured as a meshing portion 5 formed in a zigzag meshing shape. In this case, the external force acting on the wall is transmitted by the meshing portion 5 so that the stress is more integrated. It becomes possible to bear. However, the meshing portion 5 is not limited to a zigzag shape when viewed from the front of the wall. For example, a shape that is zigzag when viewed from the top of the wall, a combination thereof, or the like can be considered. As long as they are formed so as to resist movements that move relative to each other along the opposing surface without hindering movements that move apart in the opposing direction.
<3> The edge members 3 are not limited to being configured to be in direct contact with each other as described in the previous embodiment. For example, as shown in FIG. It is also possible to constitute so as to contact through a closing member 6 that closes the gap. In this case, even if the joint 1 opens with the drying shrinkage of the concrete, it is possible to prevent the joint from penetrating the front and back of the wall by the closing member 6.
The specific configuration of the closing member 6 is such that, for example, a sheet-like member is provided in a state of being folded between the two edge members 3, or an elastically deformable intervening layer is adhered to the both edge members 3. A configuration can be employed.

尚、上述のように、図面との対照を便利にするために符号を記したが、該記入により本発明は添付図面の構成に限定されるものではない。また、本発明の要旨を逸脱しない範囲において、種々なる態様で実施し得ることは勿論である。 In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry. In addition, it goes without saying that the present invention can be carried out in various modes without departing from the gist of the present invention.

耐力壁の要部を示す一部切欠き斜視図Partially cutaway perspective view showing the main part of the bearing wall 耐力壁への縁部材の設置状況を示す断面図Sectional drawing which shows the installation situation of the edge member to a bearing wall 別実施形態の縁部材の設置状況を示す壁正面視断面図Wall front view sectional drawing which shows the installation condition of the edge member of another embodiment 別実施形態の耐力壁への縁部材の設置状況を示す断面図Sectional drawing which shows the installation condition of the edge member to the bearing wall of another embodiment 従来のひび割れ誘発目地を示す要部断面図Sectional view of the main part showing a conventional crack-inducing joint 従来のひび割れ誘発目地を示す要部断面図Sectional view of the main part showing a conventional crack-inducing joint

Explanation of symbols

１ひび割れ誘発目地
３縁部材
４コンクリート
５噛み合わせ部
Ｗ耐力壁 DESCRIPTION OF SYMBOLS 1 Crack induction joint 3 Edge member 4 Concrete 5 Meshing part W Bearing wall

Claims

A reinforced concrete load-bearing wall with a groove-shaped crack-inducing joint formed in the load-bearing wall structure,
In the wall thickness of the bearing wall portion is formed with the crack inducing joint, Thea embedded pair of edge member opposed by detachably state as a boundary the joint is, the edge member is opposed surfaces to each other to, without inhibiting the movement of each other are separated in opposite directions, engagement portion to resist movement of each other relative movement along the opposing surface is formed tear Ru bearing wall structure.

The bearing wall structure according to claim 1, wherein the edge member has a strength at least equal to that of concrete.

The load bearing wall structure according to claim 1 or 2, wherein the edge member is finished as a smooth surface between opposing surfaces, and a contact surface with the wall concrete is finished as a rough surface.