JPS6312968B2 - - Google Patents
Info
- Publication number
- JPS6312968B2 JPS6312968B2 JP9872183A JP9872183A JPS6312968B2 JP S6312968 B2 JPS6312968 B2 JP S6312968B2 JP 9872183 A JP9872183 A JP 9872183A JP 9872183 A JP9872183 A JP 9872183A JP S6312968 B2 JPS6312968 B2 JP S6312968B2
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- formwork
- protective film
- corrosion
- impermeable
- 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
Links
- 238000009415 formwork Methods 0.000 claims description 28
- 230000001681 protective effect Effects 0.000 claims description 21
- 238000005260 corrosion Methods 0.000 claims description 12
- 230000007797 corrosion Effects 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 230000003014 reinforcing effect Effects 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000010422 painting Methods 0.000 description 4
- 239000013535 sea water Substances 0.000 description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000006082 mold release agent Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 description 1
- 239000002313 adhesive film Substances 0.000 description 1
- 235000012538 ammonium bicarbonate Nutrition 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- QENHCSSJTJWZAL-UHFFFAOYSA-N magnesium sulfide Chemical compound [Mg+2].[S-2] QENHCSSJTJWZAL-UHFFFAOYSA-N 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/226—Protecting piles
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、コンクリート構築物のコンクリート
及び内部の鉄筋を保護するための保護膜形成方法
に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method for forming a protective film for protecting concrete and internal reinforcing bars of a concrete structure.
コンクリート構築物は、一般に型枠を組んで内
部に補強用の鉄筋を配置した後、型枠内にコンク
リートを流し込んで製造される。
Concrete structures are generally manufactured by assembling a formwork, arranging reinforcing reinforcing bars inside the formwork, and then pouring concrete into the formwork.
コンクリートは圧縮荷重に強く、しかも内部の
鉄筋が引張及び曲げ荷重を受持つから、外力に対
してはかなりの強度を有する。しかし、天候によ
る温度差、雨水、海水等に対する強度は不充分で
あり、特に湾岸、海中構築物の場合には耐久性の
低下が著しい。 Concrete is strong against compressive loads, and because the internal reinforcing steel supports tensile and bending loads, it has considerable strength against external forces. However, the strength against temperature differences caused by weather, rainwater, seawater, etc. is insufficient, and the durability is particularly markedly reduced in the case of coastal and underwater structures.
この耐久性を低下させる最大の原因は、コンク
リートの多孔性にあり、表面から水分が浸透して
コンクリート内部の鉄筋を腐食させる。通常コン
クリートはアルカリ性であるから、鉄筋の酸化腐
食はかなり抑止されているが、コンクリート内部
に水分が浸透すると、空気中の炭酸ガスがコンク
リートを中和させ、前述の防食作用を消失させる
のである。また、寒冷地にあつてはコンクリート
内の水分が凍結してコンクリートを損傷させる要
因ともなつている。更に、湾岸及び海中構築物
は、前述の天候の他、潮風、飛沫、海水の影響を
受けるから、コンクリート及び鉄筋の腐食は一層
促進されることとなる。 The biggest cause of this decrease in durability is the porosity of concrete, which allows moisture to penetrate through the surface and corrode the reinforcing steel inside the concrete. Normally, concrete is alkaline, so oxidative corrosion of reinforcing bars is largely suppressed, but when moisture penetrates into the concrete, carbon dioxide gas in the air neutralizes the concrete, eliminating the anti-corrosion effect mentioned above. In addition, in cold regions, water in concrete freezes, causing damage to the concrete. Furthermore, since the coastal and underwater structures are affected by sea breeze, spray, and seawater in addition to the above-mentioned weather, corrosion of concrete and reinforcing steel is further accelerated.
前記欠点を解消する対策として、従来コンクリ
ート自体を改良する方法と、後処理による方法と
が採用されている。前者はコンクリート、モルタ
ル内にビニール水溶液等を混入させてコンクリー
トに耐食性を付与するものであり、構築物の内部
には一般のコンクリートを使用し、外面にのみこ
の耐食性コンクリートを使用する方法である。し
かし、この方法を使用してもコンクリートの多孔
性は変わらないから、孔を通じて水分が浸透する
のを完全には防止できない。特に海水の場合には
硫化マグネシウム、塩化マグネシウム及び重炭酸
アンモンの含有量が多いから、多少の耐食性コン
クリートでは対処し得ない。 Conventionally, methods of improving the concrete itself and methods of post-treatment have been adopted as measures to eliminate the above-mentioned drawbacks. The former is a method in which an aqueous vinyl solution or the like is mixed into the concrete or mortar to impart corrosion resistance to the concrete.General concrete is used inside the structure, and this corrosion-resistant concrete is used only on the outside. However, using this method does not change the porosity of the concrete, so it cannot completely prevent water from penetrating through the pores. Particularly in the case of seawater, the content of magnesium sulfide, magnesium chloride, and ammonium bicarbonate is high, so a certain degree of corrosion-resistant concrete cannot cope with the problem.
一方、コンクリートの後処理法には、塗料によ
るものと、不透水及び耐食性材料にて被覆するも
のがある。しかし、塗料は一般に被膜が薄く長期
間コンクリートの保護を維持できないこと、海中
構築物の場合には特殊塗料でなければ使用でき
ず、加えて海中塗装は難作業になる欠点がある。 On the other hand, post-treatment methods for concrete include those using paint and coating with water-impermeable and corrosion-resistant materials. However, paints generally have a thin coating and cannot maintain concrete protection for a long period of time, and in the case of underwater structures, only special paints can be used, and in addition, underwater painting is difficult.
また、被覆材料には、ゴムライニング、アスフ
アルト、合成樹脂、ガラス等が使用されるが、コ
ストが高いこと、海中作業は容易でない等、塗装
の場合と同様の問題がある。 In addition, rubber lining, asphalt, synthetic resin, glass, etc. are used as coating materials, but these have the same problems as painting, such as high cost and difficulty in underwater work.
本発明はかかる事情に鑑みてなされたものであ
り、その目的は、工事が容易でしかも耐久性に富
んだコンクリート構築物の保護膜形成方法を提供
することにある。
The present invention has been made in view of the above circumstances, and its purpose is to provide a method for forming a protective film for concrete structures that is easy to construct and has high durability.
上記目的を達成するため、本発明では、型枠に
コンクリートを充填する前に型枠内面に不透水性
及び耐食性の保護材を塗布し、注入されたコンク
リートが固化して型枠を除去した際にコンクリー
ト表面に保護膜が形成されるようになしてある。
In order to achieve the above object, the present invention applies an impermeable and corrosion-resistant protective material to the inner surface of the formwork before filling the formwork with concrete, and when the poured concrete hardens and the formwork is removed. A protective film is formed on the concrete surface.
第1図は、桟橋の支柱1をコンクリート被覆す
る場合の実施例を示した斜視図である。通常桟橋
は、海中に複数の鋼管支柱1を打ち込み、各支柱
の上部に鋼材(図示せず)を渡して上部コンクリ
ート2を形成すると共に、各支柱1もコンクリー
ト被覆される。
FIG. 1 is a perspective view showing an embodiment in which a support column 1 of a pier is covered with concrete. Normally, a pier is constructed by driving a plurality of steel pipe supports 1 into the sea, passing a steel material (not shown) over the top of each support to form an upper concrete 2, and each support support 1 is also covered with concrete.
コンクリート打設工事に当たつては、まず支柱
1の周囲に複数の鋼材3を組合わせて作業員の足
場を確保する。図では一組の鋼材しか示していな
いが、これらは必要に応じて上下に複数組設置さ
れるのが普通である。 For concrete pouring work, first, a plurality of steel members 3 are assembled around the pillar 1 to secure a foothold for the workers. Although only one set of steel members is shown in the figure, multiple sets of these steel members are normally installed above and below as necessary.
支柱1の外面には複数の鉄筋4が固着され、鉄
筋4はコンクリートの引張及び曲げ強度を向上さ
せる役割を果たす。この実施例における鉄筋4は
多数のボルトスタツド4aを支柱1の外面に放射
状に溶着しているが、複数の支柱1が連接する場
合には、第2図に示すように全支柱を被覆するよ
うな格子状の鉄筋5を使用する。 A plurality of reinforcing bars 4 are fixed to the outer surface of the column 1, and the reinforcing bars 4 serve to improve the tensile and bending strength of concrete. The reinforcing bar 4 in this embodiment has a large number of bolt studs 4a radially welded to the outer surface of the column 1, but when a plurality of columns 1 are connected, it is necessary to cover all the columns as shown in FIG. A grid-like reinforcing bar 5 is used.
次いで、角筒形状の型枠6にて支柱1の周囲を
被覆し、型枠6の底部をシール(図示せず)にて
密封する。型枠6には、木枠、金枠があるが、桟
橋等の打設工事には分割可能な金枠が使用される
場合が多い。 Next, the support 1 is covered with a rectangular cylinder-shaped formwork 6, and the bottom of the formwork 6 is sealed with a seal (not shown). The formwork 6 may be a wooden frame or a metal frame, but a divisible metal frame is often used for pouring work such as piers.
コンクリートを第1図の如く角形状にする場合
は、型枠6の四隅に面木7を取付けてコンクリー
ト固化後、型枠6を外し易いようにしておくのが
望ましい。また、型枠6の内面がコンクリートに
付着する虞れがあるときは、第3図Aに示すよう
に型枠6の内面に離型剤8を塗布する。 When concrete is made into a square shape as shown in FIG. 1, it is desirable to attach face plates 7 to the four corners of the formwork 6 so that the formwork 6 can be easily removed after the concrete hardens. If there is a possibility that the inner surface of the formwork 6 may adhere to the concrete, a release agent 8 is applied to the inner surface of the formwork 6 as shown in FIG. 3A.
従来はこの段階で型枠6内にコンクリートを充
填するのであるが、本発明では型枠6の内面に不
透水性及び耐食性の保護材を塗布して保護膜9を
形成する。この保護膜9は型枠6または離型剤8
の内面に軽く付着させる程度とし、できれば不透
水性かつ通気性のあるものが望ましい。保護膜9
の材料としては、不透水性及び耐食性を兼備する
ものであればよく、粘着テープ、フイルム、他の
樹脂類が使用可能である。 Conventionally, the formwork 6 is filled with concrete at this stage, but in the present invention, a water-impermeable and corrosion-resistant protective material is applied to the inner surface of the formwork 6 to form a protective film 9. This protective film 9 is applied to the formwork 6 or the mold release agent 8.
The material should be lightly attached to the inner surface of the material, preferably water-impermeable and breathable. Protective film 9
The material may be any material as long as it has both water impermeability and corrosion resistance, and adhesive tapes, films, and other resins can be used.
保護膜9を形成した後、型枠6と支柱1の空間
内にコンクリート10を充填して固化させる。コ
ンクリート10の固化後、第3図Bに示すように
型枠6を除去すれば、コンクリート10の全表面
が保護膜9によつて被覆されることとなる。保護
膜9に両面粘着テープ等を使用して型枠6側は弱
い接着力、コンクリート10側を強い接着力とす
るのが望ましい。 After forming the protective film 9, concrete 10 is filled into the space between the formwork 6 and the pillars 1 and solidified. After the concrete 10 hardens, the formwork 6 is removed as shown in FIG. 3B, and the entire surface of the concrete 10 is covered with the protective film 9. It is desirable to use double-sided adhesive tape or the like for the protective film 9 so that the formwork 6 side has a weak adhesive force and the concrete 10 side has a strong adhesive force.
この構成により、コンクリート10表面の微細
な多数の孔は全て閉塞されることになり、海水が
浸透する余地はなくなる。また、この保護膜はコ
ンクリート打設工事と共に形成されるから、従来
の塗装やライニングと比較すればその作業は極め
て容易になる。 With this configuration, all of the many fine pores on the surface of the concrete 10 are closed, leaving no room for seawater to penetrate. Furthermore, since this protective film is formed at the same time as the concrete pouring work, the work is extremely easy compared to conventional painting and lining.
コンクリート打設後の桟橋支柱を第4図に示
す。第2図の連接鋼管の場合も全く同様にして保
護膜を形成できる。保護膜9とコンクリート10
間の粘着力が充分であれば、第1図に示す面木7
を除去しても型枠6の離脱にそれ程支障は生じな
い。 Figure 4 shows the pier supports after concrete pouring. In the case of the connecting steel pipe shown in FIG. 2, the protective film can be formed in exactly the same manner. Protective film 9 and concrete 10
If the adhesion between them is sufficient, the face wood 7 shown in
Even if it is removed, it will not cause much trouble in removing the formwork 6.
尚、上記実施例では、角筒形状の型枠を使用し
たが、円筒形状のものも当然使用が可能である。
また、一般のコンクリート構築物にも充分適用で
き、後処理の塗装作業を省略することができる。 In the above embodiment, a rectangular cylinder-shaped mold was used, but a cylindrical mold can also be used.
Furthermore, it can be fully applied to general concrete structures, and post-treatment painting work can be omitted.
叙上の如く、本発明では、型枠にコンクリート
を充填する前に型枠内面に不透水性及び耐食性の
保護材を塗布し、注入されたコンクリートが固化
して型枠を除去した際にコンクリート表面に保護
膜が形成されるようになしたから、施工が容易に
なると共に耐久性に富んだ保護膜が得られる効果
がある。
As mentioned above, in the present invention, before filling the formwork with concrete, an impermeable and corrosion-resistant protective material is applied to the inner surface of the formwork, and when the poured concrete hardens and the formwork is removed, the concrete Since the protective film is formed on the surface, the construction is easy and a highly durable protective film can be obtained.
第1図は型枠の施工状態を示す斜視図、第2図
は連接支柱の斜視図、第3図A,Bは施工状態を
示す断面図、第4図はコンクリート打設後の桟橋
を示す簡略正面図である。
1……桟橋支柱、4,5……鉄筋、6……型
枠、8……離型剤、9……コンクリート保護膜、
10……コンクリート。
Figure 1 is a perspective view showing the construction state of the formwork, Figure 2 is a perspective view of the connecting support, Figures 3A and B are sectional views showing the construction state, and Figure 4 shows the pier after concrete pouring. It is a simplified front view. 1... Pier support, 4, 5... Rebar, 6... Formwork, 8... Mold release agent, 9... Concrete protective film,
10...Concrete.
Claims (1)
ートを流し込んで固化させるコンクリート構築物
の保護膜形成方法であつて、前記コンクリートの
充填前に型枠内面に不透水性及び耐食性の保護材
を塗布することを特徴とするコンクリート構築物
の保護膜形成方法。1 A method for forming a protective film for a concrete structure in which a formwork is assembled, reinforcing bars are placed, and concrete is poured into the formwork and solidified, the method comprising applying an impermeable and corrosion-resistant protective material to the inner surface of the formwork before filling with the concrete. A method for forming a protective film for a concrete structure, the method comprising applying a coating.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9872183A JPS59224730A (en) | 1983-06-02 | 1983-06-02 | Formation of protective film for concrete structure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9872183A JPS59224730A (en) | 1983-06-02 | 1983-06-02 | Formation of protective film for concrete structure |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS59224730A JPS59224730A (en) | 1984-12-17 |
JPS6312968B2 true JPS6312968B2 (en) | 1988-03-23 |
Family
ID=14227380
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9872183A Granted JPS59224730A (en) | 1983-06-02 | 1983-06-02 | Formation of protective film for concrete structure |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS59224730A (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU594694B2 (en) * | 1985-08-06 | 1990-03-15 | Onoda Cement Co., Ltd. | Method of forming protective layer on concrete or mortar |
JPS6478829A (en) * | 1987-09-22 | 1989-03-24 | Nippon Samikon Kk | Composite concrete or the like having bending and tensile strength |
JPH02117824A (en) * | 1988-10-27 | 1990-05-02 | Nippon Samikon Kk | Composite of concrete or the like having flexural tensile strength and forms left embedded |
JP6178453B1 (en) * | 2016-03-18 | 2017-08-09 | 鹿島建設株式会社 | Seat mounting method and concrete structure manufacturing method |
CN111576200B (en) * | 2020-06-04 | 2023-04-11 | 江苏东南结构防灾工程有限公司 | Heavy-duty anticorrosion reinforcing method for underwater pier composite material based on harsh environment |
-
1983
- 1983-06-02 JP JP9872183A patent/JPS59224730A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS59224730A (en) | 1984-12-17 |
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