JPH02269268A - Construction method for steel pipe concrete structure - Google Patents

Construction method for steel pipe concrete structure

Info

Publication number
JPH02269268A
JPH02269268A JP8981089A JP8981089A JPH02269268A JP H02269268 A JPH02269268 A JP H02269268A JP 8981089 A JP8981089 A JP 8981089A JP 8981089 A JP8981089 A JP 8981089A JP H02269268 A JPH02269268 A JP H02269268A
Authority
JP
Japan
Prior art keywords
steel pipe
concrete
reinforcing bar
bar cage
concrete structure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP8981089A
Other languages
Japanese (ja)
Other versions
JPH0781401B2 (en
Inventor
Kaoru Kimura
薫 木村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Obayashi Corp
Original Assignee
Obayashi Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Obayashi Corp filed Critical Obayashi Corp
Priority to JP1089810A priority Critical patent/JPH0781401B2/en
Publication of JPH02269268A publication Critical patent/JPH02269268A/en
Publication of JPH0781401B2 publication Critical patent/JPH0781401B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Rod-Shaped Construction Members (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

PURPOSE:To prevent concrete from sticking to a steel pipe by placing concrete of a concrete hardened body in which a reinforcing bar cage is buried in a hollow steel pipe, then applying the DC voltage across the steel pipe and the reinforcing bar cage so that the steel pipe side becomes a negative electrode. CONSTITUTION:A reinforcing bar cage 5 is set in a steel pipe 3 at the preset position, then concrete is placed in the steel pipe 3 to construct a column member 2. An insulating space is provided on the outer periphery of the reinforcing bar cage 5 in advance, the negative electrode side of a DC power source 6 is connected to the steel pipe 3 after concrete has been placed and before hardening is completed, the positive electrode side is connected to the reinforcing bar cage 5, and the DC voltage is applied. An electric infiltration phenomenon occurs between the steel pipe 3 and the reinforcing bar cage 5, the water in concrete is moved to the inside of the steel pipe 3, and a water film is formed. A slight gap is formed between a concrete hardened body and the inside of the steel pipe 3, and sticking can be prevented.

Description

【発明の詳細な説明】 (産業上の利用分野) この発明は、鋼管コンクリート構造物の構築工法に関す
る。
DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for constructing a steel pipe concrete structure.

(従来の技術) 円形ないしは角形断面の中空鋼管内にコンクリ−4を充
填した構造物は、建築構造物の柱部材などに利用されて
いる。
(Prior Art) A structure in which a hollow steel pipe with a circular or square cross section is filled with concrete 4 is used as a column member of a building structure.

この種の構造物では、コンクリートに圧縮加重が加わっ
たときに、鋼管がこれを規制することにより、鋼管が引
張り力に対抗するとともに、コンクリートが圧縮力に対
抗して、双方の材料が有している特性が効果的に発揮さ
れることが期待されている。
In this type of structure, when a compressive load is applied to the concrete, the steel pipe regulates this load, so that the steel pipe resists the tensile force, and the concrete resists the compressive force, so that both materials have the same It is expected that these characteristics will be effectively demonstrated.

ところが、鋼管内に充填されたコンクリートが、鋼管と
接着していると、これらの2部材が力学的に同じ挙動を
示し、鋼管が座屈するなどの問題があって、前述した効
果が得られない。
However, if the concrete filled inside the steel pipe adheres to the steel pipe, these two members exhibit the same mechanical behavior, causing problems such as buckling of the steel pipe, and the above-mentioned effects cannot be obtained. .

そこで、例えば、特開昭62−72837号公報には、
鋼管の内面にパラフィン、アスファルト。
Therefore, for example, in Japanese Patent Application Laid-open No. 62-72837,
Paraffin and asphalt on the inner surface of the steel pipe.

オイル、ワセリンなどの粘凋性のある分離材を塗布して
おき、コンクリートが鋼管の内面に付着することを防止
する鋼管コンクリート構造物の構築工法が開示されてい
る。
A method for constructing a steel pipe concrete structure is disclosed in which a viscous separating agent such as oil or petrolatum is applied to prevent concrete from adhering to the inner surface of the steel pipe.

しかしながら、この公報に示されている構築工法には、
以下に説明する技術的課題があった。
However, the construction method shown in this publication has
There were technical issues explained below.

(発明が解決しようとする課題) すなわち、上記工法に開示されている構築工法では、分
離材を鋼管の内面に塗布することによって、コンクリー
トの付着を防止しているが、分離材の塗布作業は煩雑で
ある上に、工期がかかり、塗布むらが生じ易く、コンク
リートの付着を完全に防止することが困難であった。
(Problem to be Solved by the Invention) In other words, in the construction method disclosed in the above construction method, adhesion of concrete is prevented by applying a separating material to the inner surface of the steel pipe, but the work of applying the separating material is difficult. In addition to being complicated, it takes a long time to complete the process, tends to cause uneven coating, and is difficult to completely prevent concrete from adhering.

この発明は、このような従来の問題点に鑑みてなされた
ものであり、その目的とするところは、コンクリートが
鋼管に付着することを完全に防止できるとともに、簡単
が施工できる鋼管コンクリート構造物の構築工法を提供
することにある。
This invention was made in view of these conventional problems, and its purpose is to create a steel pipe concrete structure that can completely prevent concrete from adhering to steel pipes and is easy to construct. Our goal is to provide construction methods.

(課題を解決するための手段) 上記目的を達成するために、本発明は、中空な鋼管内に
鉄筋篭が埋設されたコンクリート硬化体を構築する鋼管
コンクリート構造物の構築工法において、コンクリート
の打設後に、前記鋼管と前記鉄筋篭との間に、前記鋼管
側が負極となる直流電圧を印加することを特徴とする。
(Means for Solving the Problems) In order to achieve the above object, the present invention provides a method for constructing a steel pipe concrete structure in which a hardened concrete body in which a reinforcing bar cage is embedded in a hollow steel pipe is used. After the installation, a DC voltage is applied between the steel pipe and the reinforcing bar cage so that the steel pipe side becomes a negative electrode.

上記鋼管には、その内面に保水性のシートが層状に設け
られていてもよい。
The steel pipe may be provided with a water-retaining sheet layered on its inner surface.

上記シートは、その一部または全部が導電性を有してい
てもよい。
Part or all of the sheet may be electrically conductive.

上記シートには、高吸水性樹脂が担持させられていても
よい。
A superabsorbent resin may be supported on the sheet.

(作用) 上記構成の鋼管コンクリート構造物の構築工法によれば
、コンクリートの打設後に、鋼管と鉄筋篭との間に、鋼
管側が正極となる直流電圧を印加すると、電気浸透現象
により、コンクリート中の水が、鋼管側に移動し、これ
により、鋼管の内周面には、水膜が形成され、この状態
でコンクリートが硬化すると、コンクリートが鋼管の内
面に接着することが防止される。
(Function) According to the method for constructing a steel pipe concrete structure with the above configuration, when a DC voltage is applied between the steel pipe and the reinforcing cage after concrete is placed, with the steel pipe side being the positive electrode, electroosmosis occurs in the concrete. The water moves to the steel pipe side, thereby forming a water film on the inner circumferential surface of the steel pipe, and when the concrete hardens in this state, the concrete is prevented from adhering to the inner surface of the steel pipe.

この場合、鋼管の内面に保水性のシートを層状に設けて
おけば、電気浸透現象により移動した水が、シートに保
持されるので、より確実に、コンクリートが鋼管に接着
することが防止される。
In this case, if a layer of water-retentive sheet is provided on the inner surface of the steel pipe, water that has moved due to electroosmosis will be retained in the sheet, which will more reliably prevent concrete from adhering to the steel pipe. .

さらに、上記シートに高吸水性樹脂の粉体を担持させて
おけば、電気浸透現象により鋼管側に移動した水が、こ
の樹脂に吸収されて、保持されるとともに、水を吸収し
た樹脂はゲル化し、コンクリートが鋼管に接着すること
が防止されると同時に、ゲル化した高吸水性樹脂は、か
なり圧力が加えられても水を殆ど放出しないので、コン
クリートと鋼管との間に介在して、これらの間の摩擦を
低減させる。
Furthermore, if the sheet is loaded with superabsorbent resin powder, the water that moves toward the steel pipe due to electroosmosis will be absorbed and retained by this resin, and the water-absorbed resin will become a gel. At the same time, the gelled superabsorbent resin does not release much water even when considerable pressure is applied, so it is interposed between the concrete and the steel pipe. Reduce friction between them.

(実施例) 以下、この発明の好適な実施例について添付図面を参照
にして詳細に説明する。
(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

第1図および第2図は、この発明にかかる鋼管コンクリ
ート構造物の構築工法の一実施例を示している。
FIGS. 1 and 2 show an embodiment of the method for constructing a steel pipe concrete structure according to the present invention.

同図に示す構築工法は、この発明をスラブ1゜1間に構
築される柱部材2に適用した場合を例示しており、柱部
材2は、円形断面の鋼管3と、その内部に充填形成され
たコンクリート硬化体4と、コンクリート硬化体4中に
埋設された鉄筋篭5とから構成されている。
The construction method shown in the figure exemplifies the case where the present invention is applied to a column member 2 constructed between slabs 1. The column member 2 includes a steel pipe 3 with a circular cross section and a filling formed inside the pipe. It is composed of a hardened concrete body 4 and a reinforcing bar cage 5 buried in the hardened concrete body 4.

柱部材2の構築に当たっては、鋼管2内に鉄筋篭5を所
定の位置にセットした後に、鋼管3の内部にコンクリー
トを打設して形成される。
In constructing the column member 2, the reinforcing bar cage 5 is set in a predetermined position within the steel pipe 2, and then concrete is poured inside the steel pipe 3.

その際、予め鉄筋篭5の外周適宜箇所に絶縁スペースを
固設して、鋼管2と鉄筋篭5とが接触することを防止し
てもよい。
At that time, an insulating space may be fixed in advance at an appropriate location on the outer circumference of the reinforcing bar cage 5 to prevent the steel pipe 2 and the reinforcing bar cage 5 from coming into contact with each other.

コンクリートの打設が終了すると、コンクリートの硬化
が完了する前に、上記鋼管3に直流m16の負極側が接
続されるとともに、鉄筋篭5に直流電源6の正極側が接
続され、鋼管3と鉄筋篭5との間に直流電圧が印加され
る。
When concrete placement is completed, and before the concrete hardens, the negative pole side of the DC m16 is connected to the steel pipe 3, and the positive pole side of the DC power supply 6 is connected to the reinforcing bar cage 5, and the steel pipe 3 and the reinforcing bar cage 5 are connected to each other. A DC voltage is applied between the

この場合の直流電圧は、例えば、IOV/cm程度であ
る。
The DC voltage in this case is, for example, about IOV/cm.

このようにして、鋼管3と鉄筋篭5との間に直流電圧が
加えられると、電気浸透現象により、コンクリート中の
水が鋼管3の内面側に移動して、水膜を形成する。
In this way, when a DC voltage is applied between the steel pipe 3 and the reinforcing bar cage 5, water in the concrete moves to the inner surface of the steel pipe 3 due to electroosmosis, forming a water film.

従って、この状態でコンクリートが硬化してコンクリー
ト硬化体4が形成されると、鋼管3の内面とコンクリー
ト硬化体4との間にはわずかな隙間が形成され、コンク
リートが鋼管3の内面に接着することが防止される。
Therefore, when the concrete hardens in this state and a hardened concrete body 4 is formed, a slight gap is formed between the inner surface of the steel pipe 3 and the hardened concrete body 4, and the concrete adheres to the inner surface of the steel pipe 3. This will be prevented.

この場合、鋼管の内面に保水性のシートを層状に設けて
おけば、電気浸透現象により移動した水が、シートに保
持されるので、より確実に、コンクリートが鋼管3に接
着することが防止される。
In this case, if a layer of water-retentive sheet is provided on the inner surface of the steel pipe, the water that has moved due to electroosmosis will be retained in the sheet, thereby more reliably preventing concrete from adhering to the steel pipe 3. Ru.

また、この場合に、シートの一部または全部を、例えば
、炭素繊維で構成し、導電性を持たせておけば、シート
を鋼管3に変えて直流電源6の負極側に接続しても良い
In this case, if part or all of the sheet is made of carbon fiber and has conductivity, the sheet may be replaced with a steel pipe 3 and connected to the negative electrode side of the DC power source 6. .

さらに、上記シートに高吸水性樹脂の球状ないしはフレ
ーク状の粉体を担持させておけば、電気浸透現象により
鋼管3側に移動した水が、この樹脂に吸収されて、保持
されるとともに、水を吸収した樹脂はゲル化し、コンク
リートが鋼管3に接着することが防止されると同時に、
ゲル化した高吸水性樹脂は、かなり圧力が加えられても
水を殆ど放出しないので、コンクリート硬化体4と鋼管
3との間に長期間介在して、これらの間の摩擦を低減さ
せる。
Furthermore, if the sheet supports spherical or flake-like powder of super absorbent resin, the water that has moved to the steel pipe 3 side due to the electroosmotic phenomenon will be absorbed and retained by this resin, and the water will be absorbed by the resin and retained. The resin that absorbed the water turns into a gel and prevents the concrete from adhering to the steel pipe 3.
Since the gelled superabsorbent resin hardly releases water even if considerable pressure is applied, it remains between the hardened concrete body 4 and the steel pipe 3 for a long period of time, reducing the friction between them.

(発明の効果) 以上実施例で説明したように、この発明にかかる鋼管コ
ンクリート構造物の構築工法によれば、コンクリートの
打設後に鋼管と鉄筋篭との間に、鋼管側が負極となる直
流電圧を印加するという簡単な構成により、工期の延長
を来たすことなく、コンクリートが鋼管に接着すること
が防止され、鋼管とコンクリートとが有する特長を充分
に発揮させることができる。
(Effects of the Invention) As explained above in the embodiments, according to the method for constructing a steel pipe concrete structure according to the present invention, after concrete is placed, a DC voltage is applied between the steel pipe and the reinforcing bar cage, with the steel pipe side being the negative pole. With the simple configuration of applying , it is possible to prevent the concrete from adhering to the steel pipe without prolonging the construction period, and to fully utilize the characteristics of the steel pipe and concrete.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明工法の一実施例を示す断面図、第2図は
第1図要部拡大断面図である。 2・・・・・・・・・・・・柱部材 3・・・・・・・・・・・・鋼管 4・・・・・・・・・・・・コンクリート硬化体5・・
・・・・・・・・・・鉄筋篭 6・・・・・・・・・・・・直流電源
FIG. 1 is a sectional view showing an embodiment of the construction method of the present invention, and FIG. 2 is an enlarged sectional view of the main part of FIG. 2......Column member 3......Steel pipe 4......Hardened concrete body 5...
・・・・・・・・・Reinforcement cage 6・・・・・・・・・・・・DC power supply

Claims (4)

【特許請求の範囲】[Claims] (1)中空な鋼管内に鉄筋篭が埋設されたコンクリート
硬化体を構築する鋼管コンクリート構造物の構築工法に
おいて、コンクリートの打設後に、前記鋼管と前記鉄筋
篭との間に、前記鋼管側が負極となる直流電圧を印加す
ることを特徴とする鋼管コンクリート構造物の構築工法
(1) In a construction method for a steel pipe concrete structure in which a hardened concrete body is constructed in which a reinforcing bar cage is buried in a hollow steel pipe, after concrete is poured, a negative electrode is placed on the steel pipe side between the steel pipe and the reinforcing bar cage. A construction method for steel pipe concrete structures characterized by applying a direct current voltage.
(2)上記鋼管は、その内面に保水性のシートが層状に
設けられていることを特徴とする請求項1に記載の鋼管
コンクリート構造物の構築工法。
(2) The method for constructing a steel pipe concrete structure according to claim 1, wherein the steel pipe has a water-retentive sheet layered on its inner surface.
(3)上記シートは、その一部または全部が導電性を有
することを特徴とする請求項2に記載の鋼管コンクリー
ト構造物の構築工法。
(3) The method for constructing a steel pipe concrete structure according to claim 2, wherein a part or all of the sheet is electrically conductive.
(4)上記シートには、高吸水性樹脂が担持させられて
いることを特徴とする請求項2または3に記載の鋼管コ
ンクリート構造物の構築工法。
(4) The method for constructing a steel pipe concrete structure according to claim 2 or 3, wherein the sheet carries a superabsorbent resin.
JP1089810A 1989-04-11 1989-04-11 Construction method of steel pipe concrete structure Expired - Lifetime JPH0781401B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1089810A JPH0781401B2 (en) 1989-04-11 1989-04-11 Construction method of steel pipe concrete structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1089810A JPH0781401B2 (en) 1989-04-11 1989-04-11 Construction method of steel pipe concrete structure

Publications (2)

Publication Number Publication Date
JPH02269268A true JPH02269268A (en) 1990-11-02
JPH0781401B2 JPH0781401B2 (en) 1995-08-30

Family

ID=13981082

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1089810A Expired - Lifetime JPH0781401B2 (en) 1989-04-11 1989-04-11 Construction method of steel pipe concrete structure

Country Status (1)

Country Link
JP (1) JPH0781401B2 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102888992A (en) * 2011-07-20 2013-01-23 黄传茂 Lattice beam construction method
CN103031955A (en) * 2012-12-27 2013-04-10 山东万鑫建设有限公司 Template supporting system resisting impact force of horizontal pipe and construction method of template supporting system
JP2013184355A (en) * 2012-03-07 2013-09-19 Denki Kagaku Kogyo Kk Method of passing electric current through concrete
CN103603495A (en) * 2013-11-07 2014-02-26 中煤建筑安装工程集团有限公司 Cylinder construction method
JP2015074578A (en) * 2013-10-08 2015-04-20 鹿島建設株式会社 Method for improving quality of reinforced concrete structure
FR3101089A1 (en) * 2019-09-20 2021-03-26 Outinord St Amand POWER SUPPLY AND ELECTRICAL CONNECTION FOR ELECTRICAL POLARIZATION TO FACILITATE THE DECOFFRING OF A REINFORCED CONCRETE WALL BENCH
CN115069682A (en) * 2022-06-15 2022-09-20 江苏徐工工程机械研究院有限公司 Method and device for efficiently desorbing clay by rotary drilling
CN117550859A (en) * 2023-11-30 2024-02-13 淮阴工学院 Preparation method of maintenance-free concrete

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4884115A (en) * 1972-02-12 1973-11-08
JPS5022432A (en) * 1973-07-05 1975-03-10
JPS50107732A (en) * 1974-02-02 1975-08-25

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4884115A (en) * 1972-02-12 1973-11-08
JPS5022432A (en) * 1973-07-05 1975-03-10
JPS50107732A (en) * 1974-02-02 1975-08-25

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102888992A (en) * 2011-07-20 2013-01-23 黄传茂 Lattice beam construction method
JP2013184355A (en) * 2012-03-07 2013-09-19 Denki Kagaku Kogyo Kk Method of passing electric current through concrete
CN103031955A (en) * 2012-12-27 2013-04-10 山东万鑫建设有限公司 Template supporting system resisting impact force of horizontal pipe and construction method of template supporting system
JP2015074578A (en) * 2013-10-08 2015-04-20 鹿島建設株式会社 Method for improving quality of reinforced concrete structure
CN103603495A (en) * 2013-11-07 2014-02-26 中煤建筑安装工程集团有限公司 Cylinder construction method
FR3101089A1 (en) * 2019-09-20 2021-03-26 Outinord St Amand POWER SUPPLY AND ELECTRICAL CONNECTION FOR ELECTRICAL POLARIZATION TO FACILITATE THE DECOFFRING OF A REINFORCED CONCRETE WALL BENCH
CN115069682A (en) * 2022-06-15 2022-09-20 江苏徐工工程机械研究院有限公司 Method and device for efficiently desorbing clay by rotary drilling
CN117550859A (en) * 2023-11-30 2024-02-13 淮阴工学院 Preparation method of maintenance-free concrete
CN117550859B (en) * 2023-11-30 2025-11-28 淮阴工学院 Preparation method of maintenance-free concrete

Also Published As

Publication number Publication date
JPH0781401B2 (en) 1995-08-30

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