JP7045248B2 - Formwork for forming slits and slit forming method - Google Patents

Formwork for forming slits and slit forming method Download PDF

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JP7045248B2
JP7045248B2 JP2018079668A JP2018079668A JP7045248B2 JP 7045248 B2 JP7045248 B2 JP 7045248B2 JP 2018079668 A JP2018079668 A JP 2018079668A JP 2018079668 A JP2018079668 A JP 2018079668A JP 7045248 B2 JP7045248 B2 JP 7045248B2
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久弥 米村
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Takenaka Corp
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Description

本発明は、コンクリート壁の面方向で相対向する一対のスリット内壁面を形成する二枚のスリット用型枠板と、当該二枚のスリット用型枠板の間に介装される隙間形成部材とを有するスリット形成用型枠、および、そのスリット形成用型枠を使用するスリット形成方法に関する。 In the present invention, two slit formwork plates forming a pair of slit inner wall surfaces facing each other in the plane direction of the concrete wall and a gap forming member interposed between the two slit formwork plates are provided. The present invention relates to a slit forming formwork having the same, and a slit forming method using the slit forming formwork.

このようなスリット形成用型枠では、コンクリートを打設して養生した後の脱型時において、隙間形成部材を撤去すると、二枚のスリット用型枠板の間に隙間が生じる。したがって、その隙間を利用して二枚のスリット用型枠板を容易に撤去することが可能となる。
従来、隙間形成部材をスリット用型枠板よりも大きな面積に形成して、隙間形成部材の一部が、二枚のスリット用型枠板の間からコンクリート壁の厚み方向の前方側と後方側へ突出するように構成し、その突出部位を利用して隙間形成部材を撤去し易いように構成したものが知られている(例えば、特許文献1参照)。
In such a slit-forming formwork, when the gap-forming member is removed at the time of demolding after concrete is cast and cured, a gap is generated between the two slit-forming formwork plates. Therefore, it is possible to easily remove the two slit formwork plates by utilizing the gap.
Conventionally, the gap forming member is formed in a larger area than the slit formwork plate, and a part of the gap forming member protrudes from between the two slit formwork plates to the front side and the rear side in the thickness direction of the concrete wall. It is known that the gap forming member is easily removed by using the protruding portion thereof (see, for example, Patent Document 1).

特開2016-79731号公報Japanese Unexamined Patent Publication No. 2016-77931

しかしながら、上記文献に記載の従来技術では、コンクリート打設時に二枚のスリット用型枠板に大きな圧力が作用して、隙間形成部材が、二枚のスリット用型枠板の間に強い力で挟まれることになる。したがって、隙間形成部材の一部が、二枚のスリット用型枠板の間から突出しているとは言え、隙間形成部材の撤去に困難性が伴い、この点に改良の余地があった。 However, in the prior art described in the above document, a large pressure acts on the two slit formwork plates at the time of placing concrete, and the gap forming member is sandwiched between the two slit formwork plates with a strong force. It will be. Therefore, although a part of the gap forming member protrudes from between the two slit formwork plates, it is difficult to remove the gap forming member, and there is room for improvement in this respect.

本発明は、このような従来の問題点に着目したもので、その目的は、隙間形成部材を容易かつ迅速に撤去し得るようにし、その結果、脱型作業の容易化と迅速化を図り得るスリット形成用型枠とスリット形成方法を提供することにある。 The present invention focuses on such a conventional problem, and an object thereof is to enable easy and quick removal of the gap forming member, and as a result, to facilitate and speed up the demolding work. It is an object of the present invention to provide a form for forming a slit and a method for forming a slit.

本発明の第1特徴構成は、コンクリート壁の面方向で相対向する一対のスリット内壁面を形成する二枚のスリット用型枠板と、当該二枚のスリット用型枠板の間に介装される隙間形成部材とを有するスリット形成用型枠であって、前記二枚のスリット用型枠板が、前記コンクリート壁の厚み方向において前記スリット内壁面の上下方向の全長に亘って前記コンクリート壁の前方側へ突出する前方側突出部位と後方側へ突出する後方側突出部位を備え、前記隙間形成部材が、前記スリット内壁面の上下方向の全長に亘って前記前方側突出部位どうしの間と後方側突出部位どうしの間にそれぞれ介装さされ、
前記二枚のスリット用型枠板が、前記スリット内壁面の上下方向へ複数に分割され、その分割面が互いに離間されて接続鉄筋を挿通するための鉄筋挿通隙間が設けられる点にある。
The first characteristic configuration of the present invention is interposed between two slit formwork plates forming a pair of slit inner wall surfaces facing each other in the plane direction of the concrete wall and the two slit formwork plates. A formwork for forming a slit having a gap forming member, wherein the two formwork plates for the slit are in front of the concrete wall over the entire length in the vertical direction of the inner wall surface of the slit in the thickness direction of the concrete wall. It is provided with a front protruding portion protruding to the side and a rear protruding portion protruding to the rear side, and the gap forming member is provided between the front protruding portions and the rear side over the entire length of the inner wall surface of the slit in the vertical direction. It is interspersed between the protruding parts ,
The two slit formwork plates are divided into a plurality of pieces in the vertical direction of the inner wall surface of the slit, and the divided surfaces are separated from each other to provide a reinforcing bar insertion gap for inserting the connecting reinforcing bar .

本構成によれば、二枚のスリット用型枠板が、コンクリート壁の前方側へ突出する前方側突出部位と後方側へ突出する後方側突出部位を備え、隙間形成部材が、その前方側突出部位どうしの間と後方側突出部位どうしの間にそれぞれ介装されるので、前方側突出部位と後方側突出部位の少なくとも一方を切断し、あるいは、バールなどの工具を使用することで少なくとも一方の突出部位間に介装の隙間形成部材を容易かつ迅速に撤去して、二枚のスリット用型枠板の間に所望の隙間を生じさせることができる。
したがって、その隙間を利用して二枚のスリット用型枠板を容易に撤去して脱型することができ、前方側突出部位と後方側突出部位の両方に介装の隙間形成部材を撤去する場合には、脱型作業は更に容易かつ迅速となる。
According to this configuration, the two slit formwork plates have a front projecting portion protruding forward and a rear projecting portion projecting rearward of the concrete wall, and the gap forming member has a front projecting portion thereof. Since it is interposed between the sites and between the posterior projecting sites, at least one of the anterior projecting site and the posterior projecting site can be cut or by using a tool such as a crowbar. The gap forming member of the interposition between the protrusions can be easily and quickly removed to create a desired gap between the two slit formwork plates.
Therefore, the two slit formwork plates can be easily removed and removed from the mold by utilizing the gap, and the gap forming member of the interposition is removed from both the front protruding portion and the rear protruding portion. In some cases, the demolding work becomes easier and faster.

更に、本構成によれば、二枚のスリット用型枠板が、上下方向へ複数に分割されて、その分割面の間に接続鉄筋を挿通するための鉄筋挿通隙間が設けられるので、接続鉄筋の配筋が容易となる。そして、その鉄筋挿通隙間は、二枚のスリット用型枠板の前方側突出部位と後方側突出部位の端部にまで至るので、その端部近傍の鉄筋挿通隙間からバールなどの工具を挿入して、隙間形成部材を強制的に引き抜いて撤去することも可能となる。
したがって、前方側突出部位と後方側突出部位の少なくとも一方を切断して隙間形成部材を撤去することも、また、前方側や後方側の突出部位を切断することなく、鉄筋挿通隙間を利用して隙間形成部材を引き抜いて撤去することも可能となる。
Further, according to this configuration, the two slit formwork plates are divided into a plurality of pieces in the vertical direction, and a reinforcing bar insertion gap for inserting the connecting reinforcing bar is provided between the divided surfaces. Reinforcing bar is easy. Then, since the reinforcing bar insertion gap reaches the ends of the front side protruding portion and the rear side protruding portion of the two slit formwork plates, a tool such as a bar is inserted from the reinforcing bar insertion gap near the ends. It is also possible to forcibly pull out the gap forming member and remove it.
Therefore, the gap forming member can be removed by cutting at least one of the front protruding portion and the rear protruding portion, and the reinforcing bar insertion gap can be used without cutting the front or rear protruding portion. It is also possible to pull out the gap forming member and remove it.

本発明の第特徴構成は、前記二枚のスリット用型枠板において、前記スリット内壁面に対応する部位間の空間内に破壊容易なたわみ防止部材が介装され、そのたわみ防止部材を前記接続鉄筋が貫通している点にある。 In the second characteristic configuration of the present invention, in the two slit formwork plates, an easily destructible deflection preventing member is interposed in the space between the portions corresponding to the inner wall surface of the slit, and the deflection preventing member is provided. It is at the point where the connecting reinforcing bar penetrates.

本構成によれば、二枚のスリット用型枠板において、スリット内壁面に対応する部位間の空間内に破壊容易なたわみ防止部材が介装されるので、コンクリート打設時にコンクリートからの圧力でスリット用型枠板がたわむのが抑制され、所望する形状のスリットの形成が可能となり、かつ、そのたわみ防止部材を接続鉄筋が貫通しているので、たわみ防止部材による接続鉄筋の保持も可能となる。
そして、そのたわみ防止部材は、例えば、発泡スチロールなどの破壊容易な材料で構成されるので、隙間形成部材を撤去した後の隙間からバールなどの工具を挿入して容易に破壊して迅速に撤去することができる。
According to this configuration, in the two slit formwork plates, a flexible bending prevention member that is easily broken is interposed in the space between the parts corresponding to the inner wall surface of the slit. Since the formwork plate for slits is suppressed from bending, it is possible to form a slit having a desired shape, and the connecting reinforcing bar penetrates the bending preventing member, it is possible to hold the connecting reinforcing bar by the bending preventing member. Become.
Since the deflection prevention member is made of a easily destructible material such as styrofoam, a tool such as a bar is inserted through the gap after the gap forming member is removed to easily break it and quickly remove it. be able to.

本発明の第特徴構成は、コンクリート壁の面方向で相対向する一対のスリット内壁面を形成する二枚のスリット用型枠板と、当該二枚のスリット用型枠板の間に介装される隙間形成部材とを有するスリット形成用型枠であって、前記二枚のスリット用型枠板が、前記コンクリート壁の厚み方向において前記スリット内壁面の上下方向の全長に亘って前記コンクリート壁の前方側へ突出する前方側突出部位と後方側へ突出する後方側突出部位を備え、前記隙間形成部材が、前記スリット内壁面の上下方向の全長に亘って前記前方側突出部位どうしの間と後方側突出部位どうしの間にそれぞれ介装され、
前記二枚のスリット用型枠板が、前記スリット内壁面の上下方向に対して斜めの分割面で上下へ複数に分割され、その分割面が互いに当接される点にある。
The third characteristic configuration of the present invention is interposed between two slit formwork plates forming a pair of slit inner wall surfaces facing each other in the plane direction of the concrete wall and the two slit formwork plates. A formwork for forming a slit having a gap forming member, wherein the two formwork plates for the slit are in front of the concrete wall over the entire length in the vertical direction of the inner wall surface of the slit in the thickness direction of the concrete wall. It is provided with a front protruding portion protruding to the side and a rear protruding portion protruding to the rear side, and the gap forming member is provided between the front protruding portions and the rear side over the entire length of the inner wall surface of the slit in the vertical direction. Intervened between the protruding parts,
The two slit formwork plates are vertically divided into a plurality of pieces by a dividing surface oblique to the vertical direction of the inner wall surface of the slit, and the divided surfaces are in contact with each other.

本構成によれば、二枚のスリット用型枠板が、コンクリート壁の前方側へ突出する前方側突出部位と後方側へ突出する後方側突出部位を備え、隙間形成部材が、その前方側突出部位どうしの間と後方側突出部位どうしの間にそれぞれ介装されるので、前方側突出部位と後方側突出部位の少なくとも一方を切断し、あるいは、バールなどの工具を使用することで少なくとも一方の突出部位間に介装の隙間形成部材を容易かつ迅速に撤去して、二枚のスリット用型枠板の間に所望の隙間を生じさせることができる。
したがって、その隙間を利用して二枚のスリット用型枠板を容易に撤去して脱型することができ、前方側突出部位と後方側突出部位の両方に介装の隙間形成部材を撤去する場合には、脱型作業は更に容易かつ迅速となる。
更に、本構成によれば、二枚のスリット用型枠板が、スリット内壁面の上下方向に対して斜めの分割面で上下へ複数に分割されるので、隙間形成部材を撤去した後の脱型時において、分割されたスリット用型枠板を引き抜く際、その引き抜き方向を考慮してコンクリート壁の前方側または後方側へ引き抜くことにより、分割面に生じる摩擦力を減少させながら引き抜くことができ、その結果、容易かつ迅速に脱型することができる。
According to this configuration, the two slit formwork plates have a front projecting portion protruding forward and a rear projecting portion projecting rearward of the concrete wall, and the gap forming member has a front projecting portion thereof. Since it is interposed between the sites and between the posterior projecting sites, at least one of the anterior projecting site and the posterior projecting site can be cut or by using a tool such as a crowbar. The gap-forming member of the interposition between the protrusions can be easily and quickly removed to create the desired gap between the two slit formwork plates.
Therefore, the two slit formwork plates can be easily removed and removed from the mold by utilizing the gap, and the gap forming member of the interposition is removed from both the front protruding portion and the rear protruding portion. In some cases, the demolding work becomes easier and faster.
Further, according to this configuration, the two slit formwork plates are divided into a plurality of upper and lower parts by a dividing surface diagonal to the vertical direction of the inner wall surface of the slit, so that the two slit formwork members can be removed after the gap forming member is removed. When pulling out the split formwork for slits at the time of molding, by pulling out to the front side or the rear side of the concrete wall in consideration of the pulling direction, it is possible to pull out while reducing the frictional force generated on the split surface. As a result, it can be easily and quickly demolded.

本発明の第4特徴構成は、前記二枚のスリット用型枠板において、前記スリット内壁面に対応する部位間の空間内に破壊容易なたわみ防止部材が介装される点にある。
本構成によれば、二枚のスリット用型枠板において、スリット内壁面に対応する部位間の空間内に破壊容易なたわみ防止部材が介装されるので、コンクリート打設時にコンクリートからの圧力でスリット用型枠板がたわむのが抑制され、所望する形状のスリットの形成が可能となる。
そして、そのたわみ防止部材は、例えば、発泡スチロールなどの破壊容易な材料で構成されるので、隙間形成部材を撤去した後の隙間からバールなどの工具を挿入して容易に破壊して迅速に撤去することができる。
本発明の第特徴構成は、請求項1~のいずれか1項に記載のスリット形成用型枠を使用して前記コンクリート壁を構築した後、前記二枚のスリット用型枠板の前方側突出部位と後方側突出部位の少なくともいずれか一方を切断することにより、その切断した部位間に介装の前記隙間形成部材を撤去し、その後に脱型して前記コンクリート壁にスリットを形成する点にある。
The fourth characteristic configuration of the present invention is that in the two slit formwork plates, a easily destructible deflection preventing member is interposed in the space between the portions corresponding to the inner wall surface of the slit.
According to this configuration, in the two slit formwork plates, a flexible bending prevention member that is easily broken is interposed in the space between the parts corresponding to the inner wall surface of the slit. The bending of the slit formwork plate is suppressed, and a slit having a desired shape can be formed.
Since the deflection prevention member is made of a easily destructible material such as styrofoam, a tool such as a bar is inserted through the gap after the gap forming member is removed to easily break it and quickly remove it. be able to.
The fifth characteristic configuration of the present invention is the front of the two slit formwork plates after the concrete wall is constructed using the slit forming formwork according to any one of claims 1 to 4 . By cutting at least one of the side protruding portion and the rear side protruding portion, the gap forming member of the interposition is removed between the cut portions, and then the mold is removed to form a slit in the concrete wall. At the point.

本構成によれば、二枚のスリット用型枠板の前方側突出部位と後方側突出部位の少なくともいずれか一方を切断し、その切断した部位間に介装の隙間形成部材を撤去するので、二枚のスリット用型枠板の間に生じる隙間を利用して二枚のスリット用型枠板を容易かつ迅速に撤去、脱型してコンクリートへのスリットの形成が可能となる。 According to this configuration, at least one of the front protruding portion and the rear protruding portion of the two slit formwork plates is cut, and the gap forming member of the interposition is removed between the cut portions. Utilizing the gap created between the two slit formwork plates, the two slit formwork plates can be easily and quickly removed and removed from the mold to form a slit in concrete.

第1実施形態によるスリット形成用型枠の斜視図Perspective view of the form for forming a slit according to the first embodiment 第1実施形態によるスリット形成用型枠の横断平面図Cross-sectional plan view of the form for forming a slit according to the first embodiment 第1実施形態によるスリット形成用型枠の横断平面図Cross-sectional plan view of the form for forming a slit according to the first embodiment 第2実施形態によるスリット形成用型枠の横断平面図Cross-sectional plan view of the form for forming a slit according to the second embodiment 第2実施形態によるスリット形成用型枠の縦断側面図Longitudinal side view of the slit forming formwork according to the second embodiment 別実施形態によるスリット形成用型枠の正面図Front view of the slit forming formwork according to another embodiment

本発明によるスリット形成用型枠とスリット形成方法に関し、第1および第2実施形態を図面に基づいて説明する。
(第1実施形態)
本発明のスリット形成用型枠は、図1および図2に示すように、コンクリート壁Wを形成するための二枚の壁用前面型枠板7a、7bと二枚の壁用後面型枠板8a、8bに挟まれた状態で配置され、コンクリートの打設により構築されるコンクリート壁Wに対し、例えば、そのコンクリート壁Wを厚み方向Yへ貫通して上下方向へ延びる耐震用のスリットSを形成するものである。
そのため、コンクリート壁Wの面方向Xで相対向する一対のスリット内壁面W1、W2を形成する二枚のスリット用型枠板1、2を備えている。
なお、図1では、コンクリート壁Wの上方に窓などがあることを想定している。そのため、コンクリート壁Wの上下高さを比較的低く図示しているが、窓などがない場合には、当然、コンクリート壁Wの上下高さはかなり高いものとなる。
The first and second embodiments of the slit-forming formwork and the slit-forming method according to the present invention will be described with reference to the drawings.
(First Embodiment)
As shown in FIGS. 1 and 2, the formwork for forming a slit of the present invention has two front formwork plates 7a and 7b for a wall for forming a concrete wall W and two rear surface formwork plates for a wall. For a concrete wall W that is arranged between 8a and 8b and is constructed by placing concrete, for example, a seismic slit S that penetrates the concrete wall W in the thickness direction Y and extends in the vertical direction is provided. It is what forms.
Therefore, it is provided with two slit formwork plates 1 and 2 forming a pair of slit inner wall surfaces W1 and W2 facing each other in the surface direction X of the concrete wall W.
In FIG. 1, it is assumed that there is a window or the like above the concrete wall W. Therefore, the vertical height of the concrete wall W is shown to be relatively low, but when there is no window or the like, the vertical height of the concrete wall W is naturally quite high.

各スリット用型枠板1、2は、例えば、木製の板材で構成され、スリット内壁面W1、W2の上下方向へ複数に、この実施形態では、上下方向へ2つに分割されて、その分割面が互いに離間されている。すなわち、一方のスリット用型枠板1は、上方型枠板部位1aと下方型枠板部位1bに分割され、両型枠板部位1a、1bの分割面が互いに離間されている。他方のスリット用型枠板2も同様で、上方型枠板部位2aと下方型枠板部位2bに分割され、両型枠板部位2a、2bの分割面が互いに離間されている。
各スリット用型枠板1、2は、コンクリート壁Wの厚み方向Yにおいてスリット内壁面W1、W2の上下方向の全長に亘ってコンクリート壁Wの前方側、より具体的には、壁用前面型枠板7a、7bの前方側へ突出する前方側突出部位F1、F2と、コンクリート壁Wの後方側、より具体的には、壁用後面型枠板8a、8bの後方側へ突出する後方側突出部位R1、R2をそれぞれ備えている。
Each of the slit formwork plates 1 and 2 is made of, for example, a wooden plate, and is divided into a plurality of slit inner wall surfaces W1 and W2 in the vertical direction, and in this embodiment, the slit inner wall surfaces W1 and W2 are divided into two in the vertical direction. The faces are separated from each other. That is, one of the slit formwork plates 1 is divided into an upper formwork plate portion 1a and a lower formwork plate portion 1b, and the divided surfaces of both formwork plate portions 1a and 1b are separated from each other. The same applies to the other formwork plate 2 for slits, which is divided into an upper formwork plate portion 2a and a lower formwork plate portion 2b, and the divided surfaces of both formwork plate portions 2a and 2b are separated from each other.
The formwork plates 1 and 2 for the slits are the front side of the concrete wall W, more specifically, the front type for the wall, over the entire length of the inner wall surfaces W1 and W2 in the vertical direction in the thickness direction Y of the concrete wall W. Front side projecting portions F1 and F2 projecting to the front side of the frame plates 7a and 7b, and the rear side of the concrete wall W, more specifically, the rear side projecting to the rear side of the wall rear formwork frames 8a and 8b. The protrusions R1 and R2 are provided, respectively.

すなわち、一方のスリット用型枠板1にける上方型枠板部位1aと下方型枠板部位1bが、壁用前面型枠板7a、7bの前方側へ突出する前方側突出部位F1をそれぞれ備え、かつ、壁用後面型枠板8a、8bの後方側へ突出する後方側突出部位R1をそれぞれ備えている。同様に、他方のスリット用型枠板2にける上方型枠板部位2aと下方型枠板部位2bも、壁用前面型枠板7a、7bの前方側へ突出する前方側突出部位F2をそれぞれ備え、かつ、壁用後面型枠板8a、8bの後方側へ突出する後方側突出部位R2をそれぞれ備えている。
そして、両スリット用型枠板1、2において、スリット内壁面W1、W2の上下方向の全長に亘る状態で、前方側突出部位F1、F2どうしの間に前方側の隙間形成部材3が介装され、後方側突出部位R1、R2どうしの間に後方側の隙間形成部材4が介装される。つまり、壁用前面型枠板7a、7bよりも前方側に前方側の隙間形成部材3が、壁用後面型枠板8a、8bよりも後方側に後方側の隙間形成部材4がそれぞれ介装される。
なお、これら両隙間形成部材3、4には、コンクリートの打設により生じる圧力に対して変形し難いように、例えば、木製の角材や板材などが使用される。
That is, the upper formwork plate portion 1a and the lower formwork plate portion 1b on one of the slit formwork plates 1 are provided with front side projecting portions F1 projecting to the front side of the wall front formwork plates 7a and 7b, respectively. Moreover, the rear side projecting portion R1 projecting to the rear side of the wall rear formwork plates 8a and 8b is provided, respectively. Similarly, the upper formwork plate portion 2a and the lower formwork plate portion 2b in the other slit formwork plate 2 also have front side projecting portions F2 protruding to the front side of the wall front formwork plates 7a and 7b, respectively. In addition, it is provided with a rear side projecting portion R2 projecting to the rear side of the wall rear formwork plates 8a and 8b, respectively.
Then, in the formwork plates 1 and 2 for both slits, the front side gap forming member 3 is interposed between the front side projecting portions F1 and F2 in a state of extending the entire length of the slit inner wall surfaces W1 and W2 in the vertical direction. Then, the rear side gap forming member 4 is interposed between the rear side projecting portions R1 and R2. That is, the gap forming member 3 on the front side is interposed on the front side of the front formwork plates 7a and 7b for the wall, and the gap forming member 4 on the rear side is interposed on the rear side of the rear surface formwork plates 8a and 8b for the wall. Will be done.
For these two gap forming members 3 and 4, for example, wooden square lumber or plate material is used so as not to be easily deformed by the pressure generated by placing concrete.

更に、二枚のスリット用型枠板1、2において、一方のスリット用型枠板1の上方型枠板部位1aと下方型枠板部位1bの分割面が互いに離間され、他方のスリット用型枠板2の上方型枠板部位2aと下方型枠板部位2bの分割面も互いに離間されて、その離間空間が鉄筋挿通隙間に設定される。そして、スリット内壁面W1、W2に対応し、かつ、鉄筋挿通隙間に対応する部位間の空間内には、必要に応じて、例えば、発泡スチロールなどのような破壊容易な材料からなるたわみ防止部材5が介装される。
すなわち、二枚のスリット用型枠板1、2が、コンクリート打設時にコンクリートからの圧力でたわむ可能性が少なければ、特にたわみ防止部材5を介装する必要はない。しかし、たわむ可能性が大きい場合、あるいは、たわみを少しでも抑制したい場合には、この破壊容易なたわみ防止部材5を介装し、その場合、スリットSにより分離されるコンクリート壁Wを接続する接続鉄筋6が、その鉄筋挿通隙間を挿通してたわみ防止部材5を貫通する状態で配置される。
Further, in the two slit formwork plates 1 and 2, the divided surfaces of the upper formwork plate portion 1a and the lower formwork plate portion 1b of one of the formwork plate 1 for slitting are separated from each other, and the mold for the other slit. The dividing surfaces of the upper formwork plate portion 2a and the lower formwork plate portion 2b of the frame plate 2 are also separated from each other, and the separated space is set as the reinforcing bar insertion gap. Then, in the space between the portions corresponding to the slit inner wall surfaces W1 and W2 and corresponding to the reinforcing bar insertion gap, if necessary, the deflection prevention member 5 made of a easily destructible material such as styrofoam 5 is used. Is intervened.
That is, if there is little possibility that the two slit formwork plates 1 and 2 will bend due to the pressure from the concrete when the concrete is placed, it is not necessary to interpose the bending preventing member 5. However, if there is a high possibility of bending, or if it is desired to suppress the bending even a little, the easily destructible bending preventing member 5 is interposed, and in that case, the concrete wall W separated by the slit S is connected. The reinforcing bar 6 is arranged so as to pass through the reinforcing bar insertion gap and penetrate the deflection preventing member 5.

つぎに、このスリット形成用型枠を使用してコンクリート壁WにスリットSを形成するスリット形成方法について説明する。
図1および図2に示すように、一方のスリット用型枠板1の上方型枠板部位1aと下方型枠板部位1bの分割面、および、他方のスリット用型枠板2の上方型枠板部位2aと下方型枠板部位2bの分割面にそれぞれ鉄筋挿通隙間を形成した状態で二枚のスリット用型枠板1、2を配置する。
そして、各スリット用型枠板1、2の前方側突出部位F1、F2どうしの間には、前方側の隙間形成部材3を介装し、後方側突出部位R1、R2どうしの間には、後方側の隙間形成部材4を介装する。
Next, a slit forming method for forming the slit S in the concrete wall W using this slit forming formwork will be described.
As shown in FIGS. 1 and 2, the divided surface of the upper formwork plate portion 1a and the lower formwork plate portion 1b of one of the slit formwork plates 1 and the upper formwork of the other slit formwork plate 2 The two formwork plates 1 and 2 for slitting are arranged in a state where a reinforcing bar insertion gap is formed on the divided surfaces of the plate portion 2a and the lower formwork plate portion 2b, respectively.
Then, a gap forming member 3 on the front side is interposed between the front side projecting portions F1 and F2 of the formwork plates 1 and 2 for slits, and a gap forming member 3 on the front side is interposed between the front side projecting portions R1 and R2. The gap forming member 4 on the rear side is interposed.

更に、必要に応じて破壊容易なたわみ防止部材5を二枚のスリット用型枠板1、2の間に挟んで介装し、そのたわみ防止部材5を貫通する状態で接続鉄筋6を鉄筋挿通隙間に挿通する。なお、図示はしないが、その鉄筋挿通隙間、つまり、一方のスリット用型枠板1の上方型枠板部位1aと下方型枠板部位1bとの間の隙間、および、他方のスリット用型枠板2の上方型枠板部位2aと下方型枠板部位2bとの間の隙間は、シール用のテープなどを貼着してそれぞれ塞ぐ。そして、型枠全体を油紙等の離型用のシートなどで包み、必要に応じて離型用のシートに離型剤を塗布し、二枚の壁用前面型枠板7a、7bと壁用後面型枠板8a、8bの間に挟んで配置して固定する。
この型枠の固定に関しては、種々の方法を採用することができるが、その一例を図3に示す。すなわち、壁用前面型枠板7a、7bとして上下方向に延出する木製の桟木A、Bを有する壁用前面型枠板7a、7bを使用し、同様に、壁用後面型枠板8a、8bとして上下方向に延出する木製の桟木C、Dを有する壁用後面型枠板8a、8bを使用する。そして、桟木A、C側から面方向Xにそれぞれ釘10を打って、一方のスリット用型枠板1の上方型枠板部位1aと下方型枠板部位1b、更には隙間形成部材3、4を互いに固定し、同様に、桟木B、D側から面方向Xにそれぞれ釘10を打って、他方のスリット用型枠板2の上方型枠板部位2aと下方型枠板部位2b、更には隙間形成部材3、4を互いに固定する。
Further, if necessary, an easily destructible bending prevention member 5 is sandwiched between the two slit formwork plates 1 and 2, and the connecting reinforcing bar 6 is inserted while penetrating the bending prevention member 5. Insert through the gap. Although not shown, the reinforcing bar insertion gap, that is, the gap between the upper formwork plate portion 1a and the lower formwork plate portion 1b of one slit formwork plate 1, and the other slit formwork frame. The gap between the upper formwork plate portion 2a and the lower formwork plate portion 2b of the plate 2 is closed by attaching a sealing tape or the like. Then, the entire formwork is wrapped with a mold release sheet such as oil paper, and if necessary, a mold release agent is applied to the mold release sheet, and the two front formwork plates 7a and 7b for the wall and the wall are used. It is placed and fixed by sandwiching it between the rear formwork plates 8a and 8b.
Various methods can be adopted for fixing the formwork, and an example thereof is shown in FIG. That is, wall front formwork plates 7a and 7b having wooden crosspieces A and B extending in the vertical direction are used as wall front formwork plates 7a and 7b, and similarly, wall rear surface formwork plates 8a and As the 8b, wall rear formwork plates 8a and 8b having wooden crosspieces C and D extending in the vertical direction are used. Then, nails 10 are struck from the crosspieces A and C sides in the plane direction X, respectively, and the upper formwork plate portion 1a and the lower formwork plate portion 1b of one of the slit formwork plates 1 and further, the gap forming members 3 and 4 In the same manner, nails 10 are struck from the crosspieces B and D sides in the plane direction X, respectively, and the upper formwork plate portion 2a and the lower formwork plate portion 2b of the other slit formwork plate 2 and further The gap forming members 3 and 4 are fixed to each other.

このように、壁用前面型枠板7a、7bと壁用後面型枠板8a、8bに対してスリット用型枠板1、2や隙間形成部材3、4を固定した後、図示はしないが、必要に応じて壁用前面型枠板7a、7bと壁用後面型枠板8a、8bの外側に型枠位置決め用の鋼管などを配設し、壁用前面型枠板7a、7bと壁用後面型枠板8a、8bの間にコンクリートを打設してコンクリート壁Wを構築する。
そして、スリット形成用型枠の脱型に際しては、壁用前面型枠板7a、7bと壁用後面型枠板8a、8bを撤去する前または後において、二枚のスリット用型枠板1、2の前方側突出部位F1、F2と後方側突出部位R1、R2の少なくとも一方を切断するか、あるいは、バールなどの工具を使用して前方側突出部位F1、F2と後方側突出部位R1、R2の少なくとも一方の間に介装の隙間形成部材3、4を撤去する。いずれにせよ、前方側の隙間形成部材3と後方側の隙間形成部材4の少なくとも一方を撤去することにより、二枚のスリット用型枠板1、2の間に隙間が生じる。
したがって、その隙間からバールなどの工具を挿入して、たわみ防止部材5を破壊して撤去することができ、たわみ防止部材5の撤去により、二枚のスリット用型枠板1、2の上方型枠板部位1a、2aと下方型枠板部位1b、2bの撤去も容易となり、その結果、コンクリート壁Wに耐震用のスリットSを容易に形成することが可能となる。
In this way, after fixing the slit formwork plates 1 and 2 and the gap forming members 3 and 4 to the wall front formwork plates 7a and 7b and the wall rear surface formwork plates 8a and 8b, they are not shown. If necessary, the front formwork plates 7a and 7b for the wall and the steel pipes for positioning the formwork are arranged outside the rear formwork plates 8a and 8b for the wall, and the front formwork plates 7a and 7b for the wall and the wall are arranged. Concrete wall W is constructed by placing concrete between the rear formwork plates 8a and 8b.
When the slit-forming formwork is removed, the two slit formwork plates 1 and 2 are used before or after the wall front formwork plates 7a and 7b and the wall rear surface formwork plates 8a and 8b are removed. Cut at least one of the anterior projecting portions F1 and F2 and the posterior projecting sites R1 and R2 of 2, or use a tool such as a bar to use a tool such as a bar to cut the anterior projecting sites F1 and F2 and the posterior projecting sites R1 and R2. The gap forming members 3 and 4 of the interposition are removed between at least one of the above. In any case, by removing at least one of the gap forming member 3 on the front side and the gap forming member 4 on the rear side, a gap is generated between the two slit formwork plates 1 and 2.
Therefore, a tool such as a bar can be inserted through the gap to destroy and remove the deflection prevention member 5, and by removing the deflection prevention member 5, the upper molds of the two slit formwork plates 1 and 2 can be removed. The frame plate portions 1a and 2a and the lower formwork plate portions 1b and 2b can be easily removed, and as a result, the seismic slit S can be easily formed in the concrete wall W.

(第2実施形態)
つぎに、スリット形成用型枠の第2実施形態について説明するが、重複説明を避けるため、第1実施形態で説明した構成については、同じ符号を付すことで説明を省略し、主として第1実施形態と異なる構成について説明する。
第1実施形態では、スリット用型枠板1、2のたわみを抑制するため、スリット用型枠板1、2の間に破壊容易なたわみ防止部材5を介装した例を示したが、第2実施形態では、図4に示すように、スリット用型枠板1,2の間にたわみ防止部材5が介装されていない。
この図4を参照して、例えば、厚さ180mmのコンクリート壁Wを形成する場合、スリット用型枠板1、2として厚さ9mmのベニヤ板を使用し、前方側(内部側)の隙間形成部材3として厚さ12mmのベニヤ板を、後方側(外部側)の隙間形成部材4として厚さ5.5mmのベニヤ板を使用すれば、コンクリートからの圧力でスリット用型枠板1、2がたわむ可能性は少なく、たわみ防止部材5を使用せずに実施することが可能となる。
(Second Embodiment)
Next, the second embodiment of the slit forming formwork will be described, but in order to avoid duplication, the configurations described in the first embodiment are omitted by adding the same reference numerals, and mainly the first embodiment. A configuration different from the form will be described.
In the first embodiment, in order to suppress the deflection of the slit formwork plates 1 and 2, an example in which an easily destructible deflection prevention member 5 is interposed between the slit formwork plates 1 and 2 is shown. In the second embodiment, as shown in FIG. 4, the bending preventing member 5 is not interposed between the slit formwork plates 1 and 2.
With reference to FIG. 4, for example, when forming a concrete wall W having a thickness of 180 mm, a veneer plate having a thickness of 9 mm is used as the formwork plates 1 and 2 for slits, and a gap forming member on the front side (inside side) is used. If a veneer plate with a thickness of 12 mm is used as 3 and a veneer plate with a thickness of 5.5 mm is used as the gap forming member 4 on the rear side (outside side), the slit formwork plates 1 and 2 may bend due to the pressure from concrete. It is possible to carry out without using the deflection prevention member 5.

たわみ防止部材5を使用しない場合、図4に示すように、一方のスリット用型枠板1に当接し、かつ、内部側の壁用前面型枠板7aに当接する状態で、図5に示すように、コンクリート壁Wの上下方向の全長に亘って、発泡スチロールなどのような破壊容易な材料からなる鉄筋保持部材11を配設する。そして、その鉄筋保持部材11に接続鉄筋6を貫通させることにより接続鉄筋6を保持する。鉄筋保持部材11は、比較的厚みの薄いものでもよく、その場合、図5に示すように、ガムテープGなどを使用して接続鉄筋6をスリット用型枠板2側に固定するのが好ましい。
この第2実施形態では、コンクリート壁Wの上下高さが高いため、図5に示すように、各スリット用型枠板1、2は、上下方向へ3つ、あるいは、それ以上に分割されて、その分割面が互いに離間されている。すなわち、一方のスリット用型枠板1は、3つの部位1a、1b、1c、あるいは、それ以上に分割され、他方のスリット用型枠板2も3つの部位2a、2b、2c、あるいは、それ以上に分割されて、各分割面が互いに離間され、その離間空間が鉄筋挿通隙間に設定されて接続鉄筋6が挿通される。
なお、第2実施形態によるスリット形成方法に関しては、たわみ防止部材5に代えて、鉄筋保持部材11を配設し、コンクリート壁Wの形成後、その鉄筋保持部材11を破壊して撤去する以外、第1実施形態と特に異なる点はない。
When the deflection prevention member 5 is not used, as shown in FIG. 4, it is shown in FIG. 5 in a state where it is in contact with one of the slit formwork plates 1 and is in contact with the inner wall front formwork plate 7a. As described above, the reinforcing bar holding member 11 made of a fragile material such as styrofoam is arranged over the entire length of the concrete wall W in the vertical direction. Then, the connecting reinforcing bar 6 is held by penetrating the connecting reinforcing bar 6 through the reinforcing bar holding member 11. The reinforcing bar holding member 11 may be a relatively thin member, and in that case, as shown in FIG. 5, it is preferable to fix the connecting reinforcing bar 6 to the slit formwork plate 2 side by using a gum tape G or the like.
In this second embodiment, since the vertical height of the concrete wall W is high, as shown in FIG. 5, each of the slit formwork plates 1 and 2 is divided into three or more in the vertical direction. , The dividing surfaces are separated from each other. That is, one slit formwork plate 1 is divided into three parts 1a, 1b, 1c, or more, and the other slit formwork plate 2 is also divided into three parts 2a, 2b, 2c, or more. Divided into the above, the divided surfaces are separated from each other, the separated space is set in the reinforcing bar insertion gap, and the connecting reinforcing bar 6 is inserted.
Regarding the slit forming method according to the second embodiment, the reinforcing bar holding member 11 is arranged instead of the bending preventing member 5, and after the concrete wall W is formed, the reinforcing bar holding member 11 is destroyed and removed. There is no particular difference from the first embodiment.

〔別実施形態〕
(1)先の実施形態では、各スリット用型枠板1、2の前方側突出部位F1、F2が、壁用前面型枠板7a、7bよりも前方側へ突出し、前方側の隙間形成部材3が、その壁用前面型枠板7a、7bよりも前方側に配置された例を示したが、前方側の隙間形成部材3は、必ずしも壁用前面型枠板7a、7bよりも前方側に配置する必要はない。つまり、コンクリート壁Wよりも前方側であればコンクリート壁W側へより一層近づけて配置することもでき、後方側の隙間形成部材4に関しても同様である。
すなわち、前方側突出部位F1、F2が、コンクリート壁Wよりも前方側へ突出し、前方側の隙間形成部材3が、コンクリート壁Wよりも前方側に位置し、また、後方側突出部位R1、R2が、コンクリート壁Wよりも後方側へ突出し、後方側の隙間形成部材4が、コンクリート壁Wよりも後方側に位置するように配置することもできる。ただし、その場合には、壁用前面型枠板7a、7bまたは壁用後面型枠板8a、8bを先に脱型し、その後、例えば、前方側突出部位F1、F2または後方側突出部位R1、R2を切断して、隙間形成部材3、4を撤去することになる。
[Another Embodiment]
(1) In the above embodiment, the front projecting portions F1 and F2 of the slit formwork plates 1 and 2 project forward from the wall front formwork plates 7a and 7b, and the front side gap forming member. 3 has shown an example in which the wall front formwork plates 7a and 7b are arranged on the front side, but the gap forming member 3 on the front side is not necessarily on the front side of the wall front formwork plates 7a and 7b. It does not need to be placed in. That is, if it is on the front side of the concrete wall W, it can be arranged closer to the concrete wall W side, and the same applies to the gap forming member 4 on the rear side.
That is, the front protruding portions F1 and F2 project forward from the concrete wall W, the front gap forming member 3 is located on the front side of the concrete wall W, and the rear protruding portions R1 and R2. However, the gap forming member 4 on the rear side may be arranged so as to protrude to the rear side from the concrete wall W and to be located on the rear side from the concrete wall W. However, in that case, the front wall formwork plates 7a and 7b or the rear surface formwork plates 8a and 8b for the wall are first demolded, and then, for example, the front side protrusion parts F1, F2 or the rear side protrusion parts R1. , R2 will be cut and the gap forming members 3 and 4 will be removed.

(2)第1実施形態では、二枚のスリット用型枠板1、2の上方型枠板部位1a、2aと下方型枠板部位1b、2bの分割面の間に、また、第2実施形態では、3つの部位1a、1b、1cと部位2a、2b、2cの間にそれぞれ鉄筋挿通隙間を形成した例を示したが、スリットSにより離間されるコンクリート壁Wどうしを接続鉄筋6で接続する必要がない場合には、このような鉄筋挿通隙間を形成する必要はなく、したがって、二枚以上のスリット用型枠板1、2をそれぞれ一枚の板状体で構成することもできる。
ただし、各スリット用型枠板1、2を一枚の板状体で構成すると脱型に困難性を伴うので、図6に示すように、各スリット用型枠板1、2を斜めの切断線9に沿って上下へ複数に分割しておくことで対処可能となる。すなわち、二枚のスリット用型枠板1、2をスリット内壁面W1、W2の上下方向に対して斜めの分割面で上下へ複数に分割し、その分割面を互いに当接させておく。それによって、脱型時、図中矢印で示す方向へ各分割部位を容易にスライドさせることができ、スリット用型枠板1、2の脱型を容易に行うことができる。
また、スリットSの一例として耐震用のスリットを示したが、特に耐震用のスリットに限るものではなく、例えば、免震用のスリットやその他の各種スリットの形成にも適用可能である。したがって、スリットSに関しては、幅の広いものから狭いもの、上下方向に短いものから長いものなど、種々の形状や形態が考えられる。
(2) In the first embodiment, between the upper frame plate portions 1a and 2a of the two slit formwork plates 1 and 2 and the divided surfaces of the lower formwork plate portions 1b and 2b, and in the second embodiment. In the embodiment, an example is shown in which a reinforcing bar insertion gap is formed between the three parts 1a, 1b, 1c and the parts 2a, 2b, and 2c, respectively, but the concrete walls W separated by the slit S are connected by the connecting reinforcing bar 6. It is not necessary to form such a reinforcing bar insertion gap when it is not necessary to do so, and therefore, two or more slit formwork plates 1 and 2 can be formed of one plate-like body, respectively.
However, if the formwork plates 1 and 2 for each slit are composed of one plate-like body, it is difficult to remove the mold. Therefore, as shown in FIG. 6, the formwork plates 1 and 2 for each slit are cut diagonally. It can be dealt with by dividing it into a plurality of upper and lower parts along the line 9. That is, the two slit formwork plates 1 and 2 are divided vertically into a plurality of slit inner wall surfaces W1 and W2 at an oblique dividing surface in the vertical direction, and the divided surfaces are brought into contact with each other. As a result, at the time of demolding, each divided portion can be easily slid in the direction indicated by the arrow in the figure, and the slit formwork plates 1 and 2 can be easily demolded.
Further, although a seismic slit is shown as an example of the slit S, the slit is not particularly limited to the seismic slit, and can be applied to, for example, the formation of a seismic isolation slit and various other slits. Therefore, various shapes and forms can be considered for the slit S, such as a wide one to a narrow one and a short one to a long one in the vertical direction.

1、2 スリット用型枠板
3、4 隙間形成部材
5 たわみ防止部材
6 接続鉄筋
F1、F2 スリット用型枠板の前方側突出部位
R1、R2 スリット用型枠板の後方側突出部位
W コンクリート壁
W1、W2 スリット内壁面
S スリット
X コンクリート壁の面方向
Y コンクリート壁の厚み方向
1, 2 Slit formwork plate 3, 4 Gap forming member 5 Deflection prevention member 6 Connecting reinforcing bars F1, F2 Front side protrusion part of slit formwork plate R1, R2 Rear side protrusion part of slit formwork plate W Concrete wall W1, W2 Slit inner wall surface S Slit X Concrete wall surface direction Y Concrete wall thickness direction

Claims (5)

コンクリート壁の面方向で相対向する一対のスリット内壁面を形成する二枚のスリット用型枠板と、当該二枚のスリット用型枠板の間に介装される隙間形成部材とを有するスリット形成用型枠であって、
前記二枚のスリット用型枠板が、前記コンクリート壁の厚み方向において前記スリット内壁面の上下方向の全長に亘って前記コンクリート壁の前方側へ突出する前方側突出部位と後方側へ突出する後方側突出部位を備え、
前記隙間形成部材が、木製の角材又は板材にて構成され、前記スリット内壁面の上下方向の全長に亘って前記前方側突出部位どうしの間と後方側突出部位どうしの間にそれぞれ介装され、
前記二枚のスリット用型枠板が、前記スリット内壁面の上下方向へ複数に分割され、その分割面が互いに離間されて接続鉄筋を挿通するための鉄筋挿通隙間が設けられるスリット形成用型枠。
For slit formation having two slit formwork plates forming a pair of slit inner wall surfaces facing each other in the surface direction of the concrete wall, and a gap forming member interposed between the two slit formwork plates. It's a formwork
The two slit formwork plates project forward and rearward over the entire length of the inner wall surface of the slit in the vertical direction in the thickness direction of the concrete wall. Equipped with a lateral protrusion,
The gap forming member is made of a wooden square lumber or a plate material, and is interposed between the front protruding portions and between the rear protruding portions over the entire length of the inner wall surface of the slit in the vertical direction. ,
The two slit formwork plates are divided into a plurality of pieces in the vertical direction of the inner wall surface of the slit, and the divided surfaces are separated from each other to provide a reinforcing bar insertion gap for inserting the connecting reinforcing bar. ..
前記二枚のスリット用型枠板において、前記スリット内壁面に対応する部位間の空間内に破壊容易なたわみ防止部材が介装され、そのたわみ防止部材を前記接続鉄筋が貫通している請求項に記載のスリット形成用型枠。 The claim that in the two slit formwork plates, an easily destructible deflection preventing member is interposed in the space between the portions corresponding to the inner wall surface of the slit, and the connecting reinforcing bar penetrates the deflection preventing member. The slit forming mold according to 1 . コンクリート壁の面方向で相対向する一対のスリット内壁面を形成する二枚のスリット用型枠板と、当該二枚のスリット用型枠板の間に介装される隙間形成部材とを有するスリット形成用型枠であって、
前記二枚のスリット用型枠板が、前記コンクリート壁の厚み方向において前記スリット内壁面の上下方向の全長に亘って前記コンクリート壁の前方側へ突出する前方側突出部位と後方側へ突出する後方側突出部位を備え、
前記隙間形成部材が、木製の角材又は板材にて構成され、前記スリット内壁面の上下方向の全長に亘って前記前方側突出部位どうしの間と後方側突出部位どうしの間にそれぞれ介装され、
前記二枚のスリット用型枠板が、前記スリット内壁面の上下方向に対して斜めの分割面で上下へ複数に分割され、その分割面が互いに当接されるスリット形成用型枠。
For slit formation having two slit formwork plates forming a pair of slit inner wall surfaces facing each other in the surface direction of the concrete wall, and a gap forming member interposed between the two slit formwork plates. It's a formwork
The two slit formwork plates project forward and rearward over the entire length of the inner wall surface of the slit in the vertical direction in the thickness direction of the concrete wall. Equipped with a lateral protrusion,
The gap forming member is made of a wooden square lumber or a plate material, and is interposed between the front protruding portions and the rear protruding portions over the entire length of the inner wall surface of the slit in the vertical direction.
A slit-forming formwork in which the two slit formwork plates are divided into a plurality of upper and lower parts by a dividing surface oblique to the vertical direction of the inner wall surface of the slit, and the divided surfaces are brought into contact with each other .
前記二枚のスリット用型枠板において、前記スリット内壁面に対応する部位間の空間内に破壊容易なたわみ防止部材が介装される請求項に記載のスリット形成用型枠。 The slit forming form according to claim 3 , wherein in the two slit formwork plates, an easily destructible deflection preventing member is interposed in the space between the portions corresponding to the inner wall surface of the slit. 請求項1~のいずれか1項に記載のスリット形成用型枠を使用して前記コンクリート壁を構築した後、前記二枚のスリット用型枠板の前方側突出部位と後方側突出部位の少なくともいずれか一方を切断することにより、その切断した部位間に介装の前記隙間形成部材を撤去し、その後に脱型して前記コンクリート壁にスリットを形成するスリット形成方法。 After constructing the concrete wall using the slit forming formwork according to any one of claims 1 to 4 , the front side projecting portion and the rear side projecting portion of the two slit formwork plates A slit forming method in which the gap forming member of the interposition is removed between the cut portions by cutting at least one of them, and then the mold is removed to form a slit in the concrete wall.
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JP2002309772A (en) 2001-04-10 2002-10-23 Toyo Sangyo Kk Gap forming form and concrete placing method
JP2008101366A (en) 2006-10-18 2008-05-01 Hiroyasu Ooka Joint form and joint forming construction method
JP2016079731A (en) 2014-10-20 2016-05-16 大成建設株式会社 Concrete mold for slit, and construction method for concrete structure
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