JP2005344387A - Stud and composite wall using the same - Google Patents

Stud and composite wall using the same Download PDF

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JP2005344387A
JP2005344387A JP2004165713A JP2004165713A JP2005344387A JP 2005344387 A JP2005344387 A JP 2005344387A JP 2004165713 A JP2004165713 A JP 2004165713A JP 2004165713 A JP2004165713 A JP 2004165713A JP 2005344387 A JP2005344387 A JP 2005344387A
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stud
wall
reinforced concrete
steel
retaining wall
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JP4552114B2 (en
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Kenji Yoshitake
謙二 吉武
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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 prevent the lowering of the yield strength of a composite wall by improving the deformation performance of a stud. <P>SOLUTION: A reinforced concrete wall 3 is formed on the front face side of an earth retaining wall 1 having H-shape steel as a core material 2, and the stud 4 for integrating the earth retaining wall 1 and the reinforced concrete wall 3 is welded to one flange 2f of the core material 2 and embedded in the reinforced concrete wall 3. A waterproof sheet 7 is interposed at a boundary face between the earth retaining wall 1 and the reinforced concrete wall 3. The stud 4 is formed of a reinforcement having an enlarged diameter part at the tip, and its material is steel with an extremely low yield point. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、鋼材に植設されてコンクリート部材中に埋め込まれることで鋼材とコンクリート部材を一体化するスタッドおよびそれを用いた合成壁に関する。   The present invention relates to a stud that integrates a steel material and a concrete member by being implanted in the steel material and embedded in the concrete member, and a synthetic wall using the stud.

近年、ソイルミキシングウォールやＨ鋼横矢板工法等で使用される山留め芯材（以下、芯材と呼ぶ。）と構造物の鉄筋コンクリート地下外壁（以下、鉄筋コンクリート壁と呼ぶ。）をスタッドにより一体化して合成壁とすることが行われている（例えば、特許文献１参照。）。
このような合成壁によれば、従来仮設として扱われてきた芯材を本設構造の一部として活用することにより、地下外壁の厚さを縮小できるため、地下階の有効空間を拡大できるだけでなく、環境問題対策やコストダウンにも極めて有効である。
特許文献２では、合成地下壁の止水性を向上させるために、スタッドに環状の水膨脹止水材が環装され、且つ、ソイルミキシングウォールと鉄筋コンクリート壁との境界面に防水シートまたは塗膜系防水材が介装された合成地下壁に関する発明が開示されている。
特開２００２−３７１５４５号公報 （第２−３頁、第１図） 特開２００３−３０１４５６号公報 （第２−３頁、第１図） In recent years, a stud core material (hereinafter referred to as a core material) used in soil mixing walls, H-steel sheet pile methods, and the like, and a reinforced concrete underground outer wall (hereinafter referred to as a reinforced concrete wall) of a structure are integrated by a stud. A synthetic wall is used (see, for example, Patent Document 1).
According to such a composite wall, since the thickness of the underground outer wall can be reduced by utilizing the core material that has been treated as a temporary structure as a part of the main structure, the effective space of the underground floor can only be expanded. It is also extremely effective for measures against environmental problems and cost reduction.
In Patent Document 2, in order to improve the water-stopping property of the synthetic underground wall, an annular water-expanded water-stopping material is attached to the stud, and a waterproof sheet or coating system is provided on the boundary surface between the soil mixing wall and the reinforced concrete wall. An invention relating to a synthetic underground wall in which a waterproof material is interposed is disclosed.
JP 2002-371545 A (page 2-3, FIG. 1) JP 2003-301456 A (page 2-3, FIG. 1)

しかしながら、特許文献２に記載の発明のように、スタッド基端部に防水材が存在すると、防水材が無い場合に比べてスタッド基端部にずれが生じやすくなるため、スタッド基端部が局所的に非常に大きなせん断変形を受けて破断し、合成壁の耐力が低下するという問題がある。
本発明は、上述する問題点に鑑みてなされたもので、スタッドの変形性能を向上させることにより、合成壁の耐力低下を防ぐことを目的とする。 However, as in the invention described in Patent Document 2, when the waterproof material is present at the stud base end, the stud base end tends to be displaced as compared with the case where there is no waterproof material. In particular, there is a problem that the composite wall is broken by receiving a very large shear deformation and the yield strength of the composite wall is lowered.
This invention is made | formed in view of the problem mentioned above, and it aims at preventing the yield strength fall of a synthetic wall by improving the deformation | transformation performance of a stud.

上記目的を達成するため、本発明に係るスタッドは、鋼材に植設されてコンクリート部材中に埋め込まれることで前記鋼材と前記コンクリート部材を一体化するスタッドであって、その破断伸びが２５％以上であることを特徴とする。
本発明では、スタッドの破断伸びを２５％以上とすることにより、スタッドの変形性能が向上し、スタッドの耐力低下を防ぐことができる。 In order to achieve the above object, a stud according to the present invention is a stud that is embedded in a steel material and embedded in the concrete member to integrate the steel material and the concrete member, and the elongation at break is 25% or more. It is characterized by being.
In the present invention, by setting the fracture elongation of the stud to 25% or more, the deformation performance of the stud can be improved and the yield strength of the stud can be prevented from being lowered.

また、本発明に係るスタッドの材質は極低降伏点鋼であってもよい。
極低降伏点鋼は、普通鋼に比べて降伏点が１００Ｎ／ｍｍ２程度と低く、破断伸びも５０％以上ある高い靭性を有する鋼材である。
本発明では、スタッドに極低降伏点鋼を用いることにより、スタッドの変形性能が一層向上し、スタッドの耐力低下を防ぐことができる。 Further, the material of the stud according to the present invention may be an extremely low yield point steel.
The ultra-low yield point steel is a steel material having a high toughness with a yield point as low as about 100 N / mm 2 and a break elongation of 50% or more as compared with ordinary steel.
In the present invention, by using an extremely low yield point steel for the stud, the deformation performance of the stud can be further improved, and a decrease in the yield strength of the stud can be prevented.

また、本発明に係る合成壁では、山留壁の前面側に鉄筋コンクリート壁を形成するとともに、前記山留壁と前記鉄筋コンクリート壁とを一体化するためのスタッドが前記山留壁の芯材に植設されて前記鉄筋コンクリート壁中に埋設されてなる合成壁において、前記スタッドの破断伸びが２５％以上であることを特徴とする。   In the composite wall according to the present invention, a reinforced concrete wall is formed on the front side of the retaining wall, and a stud for integrating the retaining wall and the reinforced concrete wall is planted on the core of the retaining wall. In the composite wall that is installed and embedded in the reinforced concrete wall, the breaking elongation of the stud is 25% or more.

図２はスタッドの直接せん断試験方法を示し、立設する一対の直方体状の鉄筋コンクリート体１０、１０によってＨ形鋼１が鉛直方向に挟持されるとともに、Ｈ形鋼１の両フランジ面にそれぞれスタッド１２が溶接されて鉄筋コンクリート体１０中に埋設されている。また、Ｈ形鋼１と鉄筋コンクリート体１０との境界面には防水シート１３が介装されている。
スタッドの直接せん断試験では、Ｈ形鋼１の一方の端部１１ａを押圧することにより、Ｈ形鋼１と鉄筋コンクリート体１０とを相対変形させてスタッド１２にせん断力を発生させ、スタッド１２基端部のずれを計測する。
図３は上記試験結果を示し、縦軸はスタッド１本当たりのせん断力、横軸はスタッド基端部のずれの平均値である。同図より、破断伸びが２０％のスタッド（ＮＯ．１試験体）の場合、スタッド基端部のずれが８ｍｍ程度になるとスタッドが破断し、以後スタッドのせん断力は低下するが、破断伸びが２５％のスタッド（ＮＯ．２試験体）の場合、スタッド基端部のずれが１４ｍｍ程度までスタッドは破断せず、スタッドのせん断力も上昇することがわかる。即ち、スタッドの破断伸びを２５％以上とすることにより、スタッドの変形性能が向上し、スタッドの耐力低下を防ぐことができる。
本発明では、山留壁と鉄筋コンクリート壁とを一体化するためのスタッドの破断伸びを２５％以上とすることにより、合成壁の変形性能が向上し、合成壁の耐力低下を防ぐことができる。 FIG. 2 shows a direct shear test method for studs. The H-section steel 1 is vertically clamped by a pair of standing rectangular parallelepiped reinforced concrete bodies 10, 10, and studs are provided on both flange surfaces of the H-section steel 1, respectively. 12 is welded and embedded in the reinforced concrete body 10. Further, a waterproof sheet 13 is interposed at the boundary surface between the H-section steel 1 and the reinforced concrete body 10.
In the stud direct shear test, by pressing one end 11a of the H-section steel 1, the H-section steel 1 and the reinforced concrete body 10 are relatively deformed to generate a shear force on the stud 12, and the stud 12 base end. The deviation of the part is measured.
FIG. 3 shows the test results, where the vertical axis represents the shear force per stud and the horizontal axis represents the average value of the deviation of the stud base end. From the figure, in the case of a stud with a breaking elongation of 20% (No. 1 specimen), the stud breaks when the deviation of the stud base end is about 8 mm, and the shearing force of the stud decreases thereafter, but the breaking elongation is reduced. In the case of a 25% stud (NO. 2 test specimen), it can be seen that the stud does not break up to about 14 mm and the shearing force of the stud also increases. That is, by setting the elongation at break of the stud to 25% or more, the deformation performance of the stud can be improved and the yield strength of the stud can be prevented from being lowered.
In the present invention, by setting the fracture elongation of the stud for integrating the retaining wall and the reinforced concrete wall to 25% or more, the deformation performance of the synthetic wall can be improved and the yield strength of the synthetic wall can be prevented from being lowered.

また、本発明に係る合成壁では、前記山留壁と前記鉄筋コンクリート壁との境界面には、防水シートまたは塗膜系防水材もしくは吹付け防水材が介装されていてもよい。
ここで、防水シートとしては、単なるゴムシートや、水膨張加硫ゴム層と非水膨張加硫ゴム層とを積層したシート状の積層型水膨張止水材、あるいは生コンクリートとの反応により大きな接着力が得られる非加硫ブチルゴム系の防水シート等を用いることができる。
また、塗膜系防水材としては例えばクロロプレンゴム系のものを、吹付け防水材としては改質アスファルト系のものを用いることができる。
本発明では、山留壁と鉄筋コンクリート壁との境界面に、防水シートまたは塗膜系防水材もしくは吹付け防水材が介装されているので、合成壁の止水性が向上する。 Moreover, in the synthetic wall which concerns on this invention, the waterproof sheet, the coating-film type | system | group waterproof material, or the spraying waterproof material may be interposed in the boundary surface of the said mountain retaining wall and the said reinforced concrete wall.
Here, the waterproof sheet is large by a reaction with a simple rubber sheet, a sheet-like laminated water expansion waterproofing material in which a water expansion vulcanized rubber layer and a non-water expansion vulcanized rubber layer are laminated, or ready-mixed concrete. A non-vulcanized butyl rubber waterproof sheet or the like that can provide adhesive strength can be used.
Further, for example, a chloroprene rubber type can be used as the coating type waterproofing material, and a modified asphalt type can be used as the spraying waterproofing material.
In the present invention, the waterproofness of the synthetic wall is improved because the waterproof sheet, the coating-based waterproofing material or the spraying waterproofing material is interposed at the boundary surface between the mountain retaining wall and the reinforced concrete wall.

本発明によれば、スタッドの破断伸びを２５％以上とすることにより、スタッドの変形性能が向上し、スタッドの耐力低下を防ぐことができる。
また、本発明によれば、山留壁と鉄筋コンクリート壁とを一体化するためのスタッドの破断伸びを２５％以上とすることにより、合成壁の変形性能が向上し、合成壁の耐力低下を防ぐことができる。 According to the present invention, by setting the fracture elongation of the stud to 25% or more, the deformation performance of the stud can be improved, and a decrease in the yield strength of the stud can be prevented.
In addition, according to the present invention, by setting the fracture elongation of the stud for integrating the mountain wall and the reinforced concrete wall to 25% or more, the deformation performance of the synthetic wall is improved and the yield strength of the synthetic wall is prevented from being lowered. be able to.

以下、本発明に係る合成壁の実施形態について図面に基いて説明する。
図１は、本発明に係る合成壁の実施形態の一例を示す部分平断面図である。
図１に示すように、本実施形態による合成壁１０では、Ｈ形鋼を芯材２とする山留壁１の前面側に鉄筋コンクリート壁３が形成され、山留壁１と鉄筋コンクリート壁３とを一体化するためのスタッド４が芯材２の一方のフランジ２ｆに溶接されて鉄筋コンクリート壁３中に埋設されている。
また、山留壁１と鉄筋コンクリート壁３の境界面には防水シート７が介装されているが、防水シート７に代えて塗膜系防水材を使用してもよい。 Hereinafter, embodiments of a synthetic wall according to the present invention will be described with reference to the drawings.
FIG. 1 is a partial plan sectional view showing an example of an embodiment of a synthetic wall according to the present invention.
As shown in FIG. 1, in the synthetic wall 10 according to the present embodiment, a reinforced concrete wall 3 is formed on the front side of a mountain retaining wall 1 having an H-shaped steel as a core material 2, and the mountain retaining wall 1 and the reinforced concrete wall 3 are connected to each other. A stud 4 for integration is welded to one flange 2 f of the core member 2 and embedded in the reinforced concrete wall 3.
Moreover, although the waterproof sheet 7 is interposed in the boundary surface of the mountain retaining wall 1 and the reinforced concrete wall 3, you may use a coating-type waterproof material instead of the waterproof sheet 7. FIG.

スタッド４は、先端部に拡径部を有する鉄筋からなり、その材質は極低降伏点鋼である。この拡径部は、熱間据込加工によってスタッド４に頭部を形成したり、あるいは、スタッド４の端部に平板を溶接等により植設したものである。
なお、スタッド４の破断伸びが２５％以上であれば、極低降伏点鋼に代えて普通鋼など他の鋼材でもよい。 The stud 4 is made of a reinforcing bar having an enlarged diameter portion at the tip, and the material thereof is an extremely low yield point steel. The enlarged diameter portion is formed by forming a head portion on the stud 4 by hot upsetting, or by installing a flat plate on the end portion of the stud 4 by welding or the like.
In addition, if the elongation at break of the stud 4 is 25% or more, other steel materials such as ordinary steel may be used instead of the ultra low yield point steel.

上記の合成壁６を施工するには、山留壁１を通常の工法により施工した後、その前面側を掘削して芯材２の表面を露出させて芯材２を清掃する。そして、必要箇所に防水シート７を接着等により取り付けるとともに、スタッド４を芯材２に溶接等により植設する。
その後、通常のように壁筋５を配筋して型枠を立て込んだ後、コンクリートを打設し、所定の養生期間を経て型枠を解体して完成となる。 To construct the synthetic wall 6, the mountain retaining wall 1 is constructed by a normal construction method, and then the front side is excavated to expose the surface of the core material 2 and clean the core material 2. And while attaching the waterproof sheet 7 to a required location by adhesion | attachment etc., the stud 4 is planted to the core material 2 by welding.
Then, after placing the wall reinforcement 5 as usual and setting up the formwork, concrete is placed, and the formwork is disassembled after a predetermined curing period to complete.

なお、防水シート７を芯材２の表面にも取り付ける場合には、山留壁１の表面をサンドブラスターあるいは高圧水洗浄機等により洗浄するとともに、防水シート７にはスタッド４の取付予定位置に孔または切込を形成しておき、スタッド４をその孔または切込に通して芯材２に植設した後、スタッド４の基端部に防水シート片を重ねてシールすれば良い。
塗膜系防水材や吹付け防水材の場合も、山留壁１の施工後、芯材２を露出させて芯材２の表面を清掃するとともに、スタッド４を芯材２に溶接等で植設する。その後、スタッド４に防水材が付着しないように養生した後、防水材を塗布あるいは吹付ける。 When the waterproof sheet 7 is also attached to the surface of the core member 2, the surface of the mountain retaining wall 1 is washed with a sand blaster or a high-pressure water washer, and the stud 4 is attached to the waterproof sheet 7 at a position where the stud 4 is to be attached. A hole or notch is formed, and the stud 4 is passed through the hole or notch and planted in the core member 2, and then a waterproof sheet piece may be stacked on the base end of the stud 4 and sealed.
In the case of a coating-type waterproofing material or a spraying waterproofing material, the core material 2 is exposed to clean the surface of the core material 2 after construction of the mountain retaining wall 1, and the stud 4 is planted on the core material 2 by welding or the like. Set up. Then, after curing so that a waterproof material may not adhere to the stud 4, a waterproof material is apply | coated or sprayed.

本実施形態による合成壁６では、山留壁１と鉄筋コンクリート壁３とを一体化するためのスタッド４に極低降伏点鋼を用いることにより、合成壁６の変形性能が向上し、合成壁６の耐力低下を防ぐことができる。
また、本実施形態による合成壁６では、拡径部を有する鉄筋をスタッド４として用いることにより、山留壁１と鉄筋コンクリート壁３とを強固に一体化できるうえ、スタッド４がせん断補強筋として機能するので、鉄筋コンクリート壁３のせん断耐力が増大する。
さらに、本実施形態による合成壁６では、山留壁１と鉄筋コンクリート壁３との境界面に防水シート７が介装されているので、合成壁６の止水性が向上する。 In the composite wall 6 according to the present embodiment, by using an extremely low yield point steel for the stud 4 for integrating the mountain retaining wall 1 and the reinforced concrete wall 3, the deformation performance of the composite wall 6 is improved, and the composite wall 6 It is possible to prevent a decrease in proof stress.
Further, in the composite wall 6 according to the present embodiment, the steel retaining wall 1 and the reinforced concrete wall 3 can be firmly integrated by using a reinforcing bar having an enlarged diameter portion as the stud 4, and the stud 4 functions as a shear reinforcing bar. Therefore, the shear strength of the reinforced concrete wall 3 is increased.
Furthermore, in the composite wall 6 according to the present embodiment, the waterproof sheet 7 is interposed at the boundary surface between the mountain retaining wall 1 and the reinforced concrete wall 3, so that the water stoppage of the composite wall 6 is improved.

以上、本発明に係る合成壁の実施形態について説明したが、本発明は上記の実施形態に限定されるものではなく、その趣旨を逸脱しない範囲で適宜変更可能である。例えば、全てのスタッドについて破断伸びが２５％以上のものを使用してもよいが、スタッドのせん断力が大きい箇所のみ破断伸びが２５％以上のものを使用してもよい。また、上記の実施形態では、山留壁と鉄筋コンクリート壁の境界面に防水シートが介装されているが、止水性が問題とならない場合は防水シートは無くてもよい。   As mentioned above, although the embodiment of the synthetic wall which concerns on this invention was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it can change suitably. For example, all of the studs may have a breaking elongation of 25% or more, but only a portion having a large shearing force of the stud may have a breaking elongation of 25% or more. In the above embodiment, the waterproof sheet is interposed at the boundary surface between the mountain retaining wall and the reinforced concrete wall. However, the waterproof sheet may be omitted if water-stopping is not a problem.

本発明に係る合成壁の実施形態の一例を示す部分平断面図である。It is a partial plane sectional view showing an example of an embodiment of a synthetic wall concerning the present invention. スタッドの直接せん断試験方法を示す概略図である。It is the schematic which shows the direct shear test method of a stud. スタッドの直接せん断試験の結果を示す図である。It is a figure which shows the result of the direct shear test of a stud.

符号の説明Explanation of symbols

１ 山留壁
２ 芯材
３ 鉄筋コンクリート壁
４ スタッド
５ 壁筋
６ 合成壁
７ 防水シート 1 Yamadome Wall 2 Core Material 3 Reinforced Concrete Wall 4 Stud 5 Wall Reinforcement 6 Synthetic Wall 7 Waterproof Sheet

Claims (4)

鋼材に植設されてコンクリート部材中に埋め込まれることで前記鋼材と前記コンクリート部材を一体化するスタッドであって、
その破断伸びが２５％以上であることを特徴とするスタッド。 A stud that integrates the steel member and the concrete member by being embedded in the steel member and embedded in the concrete member,
A stud characterized by an elongation at break of 25% or more. 極低降伏点鋼からなることを特徴とする請求項１に記載のスタッド。   The stud according to claim 1, wherein the stud is made of an extremely low yield point steel. 山留壁の前面側に鉄筋コンクリート壁を形成するとともに、前記山留壁と前記鉄筋コンクリート壁とを一体化するためのスタッドが前記山留壁の芯材に植設されて前記鉄筋コンクリート壁中に埋設されてなる合成壁において、
前記スタッドの破断伸びが２５％以上であることを特徴とする合成壁。 A reinforced concrete wall is formed on the front side of the retaining wall, and a stud for integrating the retaining wall and the reinforced concrete wall is implanted in the core of the retaining wall and embedded in the reinforced concrete wall. In the synthetic wall
A synthetic wall, wherein the stud has an elongation at break of 25% or more. 前記山留壁と前記鉄筋コンクリート壁との境界面には、防水シートまたは塗膜系防水材もしくは吹付け防水材が介装されていることを特徴とする請求項３に記載の合成壁。   The synthetic wall according to claim 3, wherein a waterproof sheet, a coating-type waterproof material or a sprayed waterproof material is interposed at a boundary surface between the mountain retaining wall and the reinforced concrete wall.
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