JP2544782B2 - Concrete formwork for construction of mass concrete structures - Google Patents
Concrete formwork for construction of mass concrete structuresInfo
- Publication number
- JP2544782B2 JP2544782B2 JP63223447A JP22344788A JP2544782B2 JP 2544782 B2 JP2544782 B2 JP 2544782B2 JP 63223447 A JP63223447 A JP 63223447A JP 22344788 A JP22344788 A JP 22344788A JP 2544782 B2 JP2544782 B2 JP 2544782B2
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- formwork
- construction
- insulating plate
- mass
- 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.)
- Expired - Lifetime
Links
- 239000004567 concrete Substances 0.000 title claims description 56
- 238000009415 formwork Methods 0.000 title claims description 37
- 238000010276 construction Methods 0.000 title claims description 11
- 239000000463 material Substances 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 230000003014 reinforcing effect Effects 0.000 claims description 7
- 239000012779 reinforcing material Substances 0.000 claims description 6
- 239000007769 metal material Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 claims description 2
- 230000002745 absorbent Effects 0.000 claims 1
- 239000002250 absorbent Substances 0.000 claims 1
- 238000000034 method Methods 0.000 description 10
- 239000004568 cement Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000004745 nonwoven fabric Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000029058 respiratory gaseous exchange Effects 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 229920006328 Styrofoam Polymers 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000008261 styrofoam Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Landscapes
- Bridges Or Land Bridges (AREA)
- Finishing Walls (AREA)
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
Description
【発明の詳細な説明】 《産業上の利用分野》 この発明は、マスコンクリート構造物の構築方法に用
いられるコンクリート製の型枠に関する。TECHNICAL FIELD The present invention relates to a concrete formwork used in a method for constructing a mass concrete structure.
《従来の技術》 周知のように、吊橋のアンカレッジなどには、巨大な
マスコンクリート構造物が構築されるが、この種のマス
コンクリート構造物では、セメントの水和反応熱が極め
て大きくなり、この反応熱による熱膨張により、特に構
造物の表面付近に多数のひび割れが発生することが知ら
れている。<Prior art> As is well known, a huge mass concrete structure is constructed in an anchorage of a suspension bridge, etc., but in this kind of mass concrete structure, the heat of hydration reaction of cement becomes extremely large, It is known that a large number of cracks occur particularly near the surface of the structure due to the thermal expansion due to the reaction heat.
このようなひび割れをそのまま放置しておくと、構造
物の内部の鉄筋や鋼材等が空気や浸水に晒され、これら
が腐触するという問題がある。If such cracks are left as they are, there is a problem that the reinforcing bars, steel materials, etc. inside the structure are exposed to air and water, and they corrode.
また、ひび割れに侵入した水は、冬期などに凍結して
体積が膨張することもあって、ひび割れがさらに進行し
て、構造物の致命的な欠陥に繋がるおそれがある。In addition, the water that has entered the cracks may freeze and expand in volume during the winter, etc., and the cracks may progress further, leading to fatal defects in the structure.
この様な問題の対策としては、従来、仕上げコンク
リート（モルタル）を塗着する、コンクリート製型枠
を埋め殺しで使用するという方法が採用されていたが、
の方法では、工期，工費の面で不利となるだけでな
く、マスコンクリートとのなじみの問題や維持補修を要
するなどの欠点もあるので、一般的にはの方法が多用
されている。As a measure against such a problem, conventionally, a method of applying finish concrete (mortar) and burying and using a concrete formwork have been adopted,
The method (1) is not only disadvantageous in terms of construction period and construction cost, but also has drawbacks such as compatibility with mass concrete and maintenance and repair. Therefore, the method (2) is generally used.
第４図は、コンクリート製型枠を用いたマスコンクリ
ート構造物の構築方法の一例を示している。FIG. 4 shows an example of a method for constructing a mass concrete structure using a concrete formwork.
同図に示す構築方法では、コンクリート製の型枠１は
予め連結材２の一端を埋設した状態で製作されており、
型枠１を構造物中に埋設される補強材３の周囲に、連結
材２の他端を補強材３に結合させて建込み、型枠１で囲
繞された部分にコンクリート４を打設し、隣接する型枠
１間に止水材５を充填して構造物が構築される。In the construction method shown in the figure, the concrete formwork 1 is manufactured in a state in which one end of the connecting material 2 is embedded in advance,
The formwork 1 is built around the reinforcing material 3 embedded in the structure by connecting the other end of the connecting material 2 to the reinforcing material 3 and placing concrete 4 in the portion surrounded by the formwork 1. The structure is constructed by filling the water blocking material 5 between the adjacent molds 1.
しかしながら、この様なマスコンクリート構造物の構
築方法に使用されている型枠には以下に説明する技術的
課題があった。However, the formwork used in such a method for constructing a mass concrete structure has the technical problems described below.
《発明が解決しようとする課題》 すなわち、上記方法では、コンクリート４を打設する
と、既に硬化している型枠１の内面と、これから硬化し
ようとする打設コンクリート４とが直接接触し、打設さ
れたコンクリート４の熱膨張により、型枠１の内面とコ
ンクリート４の外面との間に摩擦力が作用するが、この
とき型枠１は比較的剛性が大きい鋼製の連結材２で補強
材３と結合されているので、この摩擦に伴なって型枠１
には面方向の引張り力が加わることになり、この引張り
力により型枠１にひび割れが発生するという問題があっ
た。<< Problems to be Solved by the Invention >> That is, in the above method, when the concrete 4 is cast, the inner surface of the mold 1 that has already hardened and the casting concrete 4 that is about to harden directly come into contact, Due to the thermal expansion of the installed concrete 4, a frictional force acts between the inner surface of the formwork 1 and the outer surface of the concrete 4, but at this time, the formwork 1 is reinforced by the steel-made connecting member 2 having a relatively high rigidity. Since it is combined with the material 3, the formwork 1 is accompanied by this friction.
There is a problem that a tensile force in the surface direction is applied to the mold, and the tensile force causes cracks in the mold 1.
この発明はこのような従来の問題点に鑑みてなされた
ものであって、その目的とするところは、ひび割れが生
じることのないマスコンクリート構造物の構築用の型枠
を提供することにある。The present invention has been made in view of such conventional problems, and an object thereof is to provide a formwork for constructing a mass concrete structure which does not cause a crack.
《課題を解決するための手段》 上記目的を達成するために、この発明は、構築される
マスコンクリート中に埋設される鉄筋，鋼材などの補強
材の外周に設置され、これによって囲繞した部分にコン
クリートを打設する構築方法に用いられるマスコンクリ
ート構造物の構築用コンクリート製型枠であって、該型
枠は、製作されるときにその内周面に吸水性の絶縁板が
押圧状態で一体的に貼着されてなるとともに、軟鋼，銅
合金などの軟質金属材料で構成され前記補強材と連結さ
れる連結材の一端が前記絶縁板を貫通して埋設されるこ
とを特徴とする。<< Means for Solving the Problems >> In order to achieve the above object, the present invention is installed on the outer periphery of a reinforcing material such as a reinforcing bar or a steel material embedded in a constructed mass concrete, and thereby the enclosed portion is surrounded. A concrete formwork for construction of a mass concrete structure used in a construction method for placing concrete, wherein the formwork is integrally formed with a water-absorbing insulating plate in a pressed state on its inner peripheral surface. One end of a connecting member made of a soft metal material such as mild steel or a copper alloy and connected to the reinforcing member is embedded through the insulating plate.
《作用》 上記構成の型枠によれば、マスコンクリートが打設さ
れる内面側に絶縁板が貼着され、かつ、型枠を構造物の
補強材と結合させる連結材が軟質金属材料で構成されて
いるので、打設されたコンクリートの熱膨張により、型
枠とコンクリート間に摩擦力が生じたときに、型枠は摩
擦による変形に追随性があり、型枠自体が吸水性の絶縁
板を押圧状態で一体的に貼着してなるので該型枠自体の
強度が向上することと相俟って、型枠のひび割れが確実
に防止される。<< Operation >> According to the formwork having the above configuration, the insulating plate is attached to the inner surface side where the mass concrete is placed, and the connecting material for connecting the formwork with the reinforcing material of the structure is made of a soft metal material. Therefore, when a frictional force is generated between the formwork and the concrete due to the thermal expansion of the cast concrete, the formwork follows the deformation due to friction, and the formwork itself is a water-absorbing insulating plate. Since it is integrally attached in a pressed state, the strength of the mold itself is improved, and cracks in the mold are reliably prevented.
《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。Embodiment Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
第１図から第３図は、この発明にかかるマスコンクリ
ート構築方法に用いられる型枠の一実施例を示してい
る。1 to 3 show an embodiment of a form used in the method for constructing mass concrete according to the present invention.
同図に示す型枠10は、鉄筋コンクリート製の本体12
と、この本体12の一面に一体として貼着された絶縁板14
と、この絶縁板14を貫通して一端が本体12に埋設された
複数の連結材16とから構成されている。The formwork 10 shown in the figure is a main body 12 made of reinforced concrete.
And an insulating plate 14 integrally attached to one surface of the main body 12.
And a plurality of connecting members 16 which penetrate the insulating plate 14 and are embedded in the main body 12 at one end.
この絶縁板14は吸水性を有しており、例えば、不織
布，細孔が穿設された防水性のフィルムが接着された不
織布，織布，スポンジなどから構成される。The insulating plate 14 has a water absorbing property and is made of, for example, a non-woven fabric, a non-woven fabric to which a waterproof film having pores is adhered, a woven fabric, a sponge, or the like.
また、連結材16は、例えば、軟鋼，銅合金等の比較的
軟質な金属材料が用いられる。The connecting material 16 is made of a relatively soft metal material such as mild steel or copper alloy.
このような型枠10は、型枠形状にあわせた枠体18を用
い、この枠体18内に配筋をした状態で連結材16の一端を
配筋にからませて立設させ、枠体18内に本体12用のコン
クリートを打設し、打設されたコンクリート上にこれが
硬化する前に絶縁板14を載置して製作される。Such a formwork 10 uses a frame body 18 matched to the shape of the formwork, and one end of the connecting member 16 is entangled in the rebar in a state in which the rebar is arranged in the frame body 18 to stand upright. It is manufactured by placing concrete for the main body 12 in 18 and placing an insulating plate 14 on the cast concrete before it is cured.
このような型枠10は、打設されたコンクリート上に絶
縁板14を載置した状態で、第２図に示すように、絶縁板
14上にプレス板20を載せ、その上方からプレス板20を押
圧して打設コンクリート中のブリージング水を絶縁板14
を介して外部に放出することにより製作される。Such a form 10 has an insulating plate 14 placed on the cast concrete, as shown in FIG.
The press plate 20 is placed on the press plate 14, and the press plate 20 is pressed from above to press the breathing water in the concrete into the insulating plate 14.
It is manufactured by discharging it through the outside.
また、本体12の形成用のコンクリートの養生に当たっ
ては、散水などにより絶縁板14に吸水させて養生させる
ことが好ましい。Further, in curing the concrete for forming the main body 12, it is preferable that the insulating plate 14 absorb water by sprinkling water or the like for curing.
以上のような型枠10の製作方法を採用すれば、型枠10
の本体12のコンクリートの強度が大幅に改善される。If the manufacturing method of the mold 10 as described above is adopted, the mold 10
The strength of the concrete of the body 12 is significantly improved.
このようにして製作された型枠10は、第３図に示すよ
うに、構築されるマスコンクリート中に埋設される鉄
筋，鋼材などの補強材22に連結材16の一端を接合して、
補強材22の外周を囲繞するようにして隣接して建込まれ
る。As shown in FIG. 3, the formwork 10 manufactured in this manner joins one end of the connecting member 16 to the reinforcing member 22 such as a reinforcing bar or a steel material embedded in the constructed mass concrete,
The reinforcement members 22 are built adjacent to each other so as to surround the outer periphery thereof.
このとき、各型枠10に貼着されている絶縁板14は、そ
れぞれ内面側に位置するように設置される。At this time, the insulating plate 14 attached to each mold 10 is installed so as to be located on the inner surface side.
また、各連結材16の外周には、合成ゴム，発泡スチロ
ールなどで構成された筒状の緩衝材23が設けられる。Further, on the outer circumference of each connecting member 16, a cylindrical cushioning member 23 made of synthetic rubber, styrofoam, or the like is provided.
なお、この緩衝材23は必ずしも連結材16の全長に亘っ
て設ける必要はなく、絶縁板14に当接するようにして部
分的に設けてもよい。The cushioning material 23 does not necessarily have to be provided over the entire length of the connecting material 16, and may be partially provided so as to contact the insulating plate 14.
そして、設置が完了すると、型枠10で囲繞された部分
にコンクリート24が打設されて、型枠10が埋殺された状
態で構造物が構築される。Then, when the installation is completed, the concrete 24 is placed in the portion surrounded by the formwork 10, and the structure is constructed with the formwork 10 being buried.
コンクリート24が打設されると、コンクリート24中の
セメントの水和反応により大きな反応熱が発生し、その
体積が膨張するとともに、冷却すると体積が収縮する。When the concrete 24 is poured, a large reaction heat is generated due to the hydration reaction of the cement in the concrete 24, and its volume expands, and when cooled, the volume contracts.
このような打設コンクリート24の挙動に対して、型枠
10の本体12のコンクリートは既に硬化しているので、体
積変化がなく、これらを直接接触させておくと、前述し
たように型枠10と打設コンクリート24との間に摩擦力が
発生して型枠10にひび割れが生じるが、本発明では、型
枠10の内面に絶縁板14が貼着されており、しかもこの絶
縁板14が不織布などから構成されており、コンクリート
硬化後には絶縁板14の内部に微細な空間が存在している
ので、打設コンクリート24の体積変化を吸収する。For such behavior of the poured concrete 24, the formwork
Since the concrete of the main body 12 of 10 has already hardened, there is no volume change, and if these are brought into direct contact with each other, a frictional force is generated between the formwork 10 and the poured concrete 24 as described above. Although the mold 10 is cracked, in the present invention, the insulating plate 14 is attached to the inner surface of the mold 10, and the insulating plate 14 is made of non-woven fabric or the like. Since there is a fine space inside, the volume change of the cast concrete 24 is absorbed.
また、絶縁板14の吸収効果が若干不足していても、型
枠10が絶縁板14の上方からプレス板20を押圧して打設コ
ンクリート中のブリージング水を該絶縁板14を介して外
部に放出しているので、型枠10自体が高強度となってい
るとともに、型枠10を補強材22に連結する連結材16が比
較的軟質な金属材料で構成されているので、型枠10は打
設コンクリート24の挙動に追随することができ、これら
の相乗作用により型枠10にひび割れが発生することを防
止する。Further, even if the insulating plate 14 has a slightly insufficient absorbing effect, the formwork 10 presses the press plate 20 from above the insulating plate 14 to breathe the breathing water in the cast concrete to the outside through the insulating plate 14. Since the mold 10 is released, the mold 10 itself has high strength, and the connecting member 16 that connects the mold 10 to the reinforcing member 22 is made of a relatively soft metal material. It is possible to follow the behavior of the cast concrete 24, and prevent the formwork 10 from cracking due to the synergistic effect of these.
なお、第３図に示した構築方法では、型枠10の側面外
周に予めゴム，エポキシなどからなる止水材26を巻き付
けておき、これを所定の位置に建込み、隣接する型枠10
間にコーキング28が施される。In the construction method shown in FIG. 3, the waterproof material 26 made of rubber, epoxy, or the like is wound around the outer periphery of the side surface of the mold 10 in advance, and this is installed at a predetermined position, and the adjacent mold 10 is closed.
Caulking 28 is applied in the meantime.
また、型枠10に貼着されている絶縁板14は、吸水性を
備えているので、打設されたマスコンクリート24の過剰
な水を吸水し、型枠10に接する表面における実質上の水
−セメント比が増大してコンクリート表面を緻密にする
機能も備えている。Further, since the insulating plate 14 attached to the mold 10 has water absorbency, it absorbs excess water of the cast mass concrete 24, and substantially water on the surface in contact with the mold 10 is absorbed. -It also has the function of increasing the cement ratio and making the concrete surface dense.
《発明の効果》 以上実施例で説明したように、この発明にかかるマス
コンクリート構造物の構築用コンクリート製型枠によれ
ば、比較的簡単な構成を従来の型枠に追加することによ
り、そのひび割れを防止できるという優れた効果が得ら
れる。<< Effects of the Invention >> As described in the above embodiments, according to the concrete formwork for construction of the mass concrete structure according to the present invention, by adding a relatively simple structure to the conventional formwork, An excellent effect that cracks can be prevented can be obtained.
第１図は本発明にかかる型枠の一実施例を示す断面図、
第２図は同型枠の製作方法の説明図、第３図は同型枠を
使用したマスコンクリート構造物の構築方法の説明図、
第４図は従来のマスコンクリート構造物の構築方法の説
明図である。 10……型枠 12……本体 14……絶縁板 16……連結材 22……補強材 24……コンクリートFIG. 1 is a sectional view showing an embodiment of a formwork according to the present invention,
FIG. 2 is an explanatory diagram of a method for manufacturing the same form, and FIG. 3 is an explanatory diagram of a method for constructing a mass concrete structure using the same form,
FIG. 4 is an explanatory diagram of a conventional method for constructing a mass concrete structure. 10 …… Formwork 12 …… Main body 14 …… Insulation plate 16 …… Connecting material 22 …… Reinforcing material 24 …… Concrete
Claims (1)
る鉄筋，鋼材などの補強材の外周に設置され、これによ
って囲繞した部分にコンクリートを打設する構築方法に
用いられるマスコンクリート構造物の構築用コンクリー
ト製型枠であって、 該型枠は、その内周面に吸水性の絶縁板が一体的に貼着
されてなるとともに、軟鋼，銅合金などの軟質金属材料
で構成され前記補強材と連結される連結材の一端が前記
絶縁板を貫通して埋設されていることを特徴とするマス
コンクリート構造物の構築用コンクリート製型枠。1. Construction of a mass concrete structure used for a construction method, which is installed on the outer periphery of a reinforcing material such as a reinforcing bar and a steel material embedded in the constructed mass concrete, and by which concrete is placed in a portion surrounded by the reinforcement material. A concrete formwork for use in which the water absorbent insulating plate is integrally attached to the inner peripheral surface of the formwork, and the formwork is made of a soft metal material such as mild steel or copper alloy. A concrete formwork for construction of a mass concrete structure, characterized in that one end of a connecting member connected to the base plate is embedded through the insulating plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63223447A JP2544782B2 (en) | 1988-09-08 | 1988-09-08 | Concrete formwork for construction of mass concrete structures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63223447A JP2544782B2 (en) | 1988-09-08 | 1988-09-08 | Concrete formwork for construction of mass concrete structures |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0274753A JPH0274753A (en) | 1990-03-14 |
| JP2544782B2 true JP2544782B2 (en) | 1996-10-16 |
Family
ID=16798285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63223447A Expired - Lifetime JP2544782B2 (en) | 1988-09-08 | 1988-09-08 | Concrete formwork for construction of mass concrete structures |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2544782B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2550585Y2 (en) * | 1990-08-03 | 1997-10-15 | アキレス株式会社 | Formwork / heat insulation material with concrete excess water discharge function |
| JPH0663610U (en) * | 1993-02-23 | 1994-09-09 | 株式会社ダイトー | Abandoned formwork |
| JPH07229222A (en) * | 1994-02-17 | 1995-08-29 | Shimizu Corp | Buried formwork and buried formwork covered concrete structure |
| CN107989183B (en) * | 2017-11-13 | 2019-07-09 | 中建二局第一建筑工程有限公司 | A kind of intelligent reinforced concrete frame structure that energy consumption mechanism is adaptive |
| CN109972526A (en) * | 2019-04-23 | 2019-07-05 | 四川公路桥梁建设集团有限公司 | Rebar installation replacing method for realizing steel bar dense area |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5236244U (en) * | 1975-09-05 | 1977-03-15 | ||
| JPS61216930A (en) * | 1985-03-19 | 1986-09-26 | Kumagai Gumi Ltd | Concrete formwork for slope |
-
1988
- 1988-09-08 JP JP63223447A patent/JP2544782B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0274753A (en) | 1990-03-14 |
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