JP2019218729A - Concrete joint construction method - Google Patents

Concrete joint construction method Download PDF

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JP2019218729A
JP2019218729A JP2018115584A JP2018115584A JP2019218729A JP 2019218729 A JP2019218729 A JP 2019218729A JP 2018115584 A JP2018115584 A JP 2018115584A JP 2018115584 A JP2018115584 A JP 2018115584A JP 2019218729 A JP2019218729 A JP 2019218729A
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resin member
concrete
resin
concrete structure
hardening
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JP7076295B2 (en
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周斗 高橋
Shuto Takahashi
周斗 高橋
直樹 曽我部
Naoki Sogabe
直樹 曽我部
祐起 横田
Yuki Yokota
祐起 横田
康祐 横関
Kosuke Yokozeki
康祐 横関
林　大介
Daisuke Hayashi
大介 林
剛 取違
Takeshi Torii
剛 取違
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Kajima Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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Abstract

To provide a concrete joint construction method with which high integration and water cut-off performance at the concrete joint parts can be obtained.SOLUTION: A concrete joint construction method includes a first curing step for curing fresh concrete 11 in a state of being in contact with a front surface 9a of a resin member 9 containing silica ingredients, a second curing step for curing fresh concrete 12 in a state of being in contact with a back surface 9b of the resin member 9. By this joint construction method, high integration and water cut-off performance are obtained at the joint parts between the new and old concrete structures 1, 2 and the resin member 9, and as a result, high integration and water cut-off performance are obtained at joint parts of concrete.SELECTED DRAWING: Figure 2

Description

本発明は、コンクリートの打継方法に関するものである。   The present invention relates to a method for transferring concrete.

従来、下記特許文献１のコンクリートの打継方法が知られている。この方法は、旧コンクリート構造物の打継面を清掃した後、アクリル樹脂溶剤にセメントと硬質骨材を混合した混合液を塗布材として打継面の全面にわたり均質に塗布し、その塗布材の硬化後に新しいコンクリートを打継ぎするものである。特許文献１では、上記の方法により、従来のチッピング工法に比べて早く安価に施工できる旨が提案されている。   BACKGROUND ART Conventionally, a method of joining concrete disclosed in Patent Document 1 below is known. In this method, after the joint surface of the old concrete structure is cleaned, a mixture of a cement resin and a hard aggregate is mixed with an acrylic resin solvent as a coating material, and the mixture is uniformly applied over the entire joint surface. After hardening, new concrete is transferred. Patent Literature 1 proposes that the above method can be performed quickly and inexpensively as compared with the conventional chipping method.

特開2003-253884号公報JP 2003-253884 JP

この種のコンクリートの打継方法においては、コンクリートの打継部における一体性と止水性とを更に強化することが求められている。本発明は、コンクリートの打継部における高い一体性と止水性とが得られるコンクリートの打継方法を提供することを目的とする。   In this type of concrete joining method, it is required to further enhance the integrity and the water stopping property of the concrete joining portion. SUMMARY OF THE INVENTION An object of the present invention is to provide a method of joining concrete in which high integrity and waterproofness can be obtained in a joint portion of concrete.

本発明のコンクリートの打継方法は、第１のフレッシュコンクリートを、シリカ成分を含む樹脂部材の表側の面に接触した状態で硬化させる第１硬化工程と、第２のフレッシュコンクリートを、樹脂部材の裏側の面に接触した状態で硬化させる第２硬化工程と、を備える。   The method for transferring concrete of the present invention comprises a first hardening step of hardening a first fresh concrete in a state of being in contact with a front side surface of a resin member containing a silica component, and a second hardening concrete of the resin member. A second curing step of curing in a state of contacting the back surface.

フレッシュコンクリートが硬化する際には、セメントの水和反応過程において、樹脂部材に含まれるシリカ成分とフレッシュコンクリートに含まれる水酸化カルシウムとの化学反応によって、珪酸カルシウム水和物の一種であるトバモライト(5CaO・6SiO2・5H2O)が生成する。よって、上記打継方法によれば、第１のフレッシュコンクリートで形成されるコンクリート構造物と樹脂部材との接合部、及び第２のフレッシュコンクリートで形成されるコンクリート構造物と樹脂部材との接合部では、トバモライトが生成する化学反応によって高い一体性と止水性とが得られ、その結果、コンクリートの打継部において高い一体性と止水性とが得られる。 When fresh concrete hardens, during the hydration reaction of cement, due to the chemical reaction between the silica component contained in the resin member and the calcium hydroxide contained in the fresh concrete, tobermorite, a type of calcium silicate hydrate ( 5CaO · 6SiO 2 · 5H 2 O ) is produced. Therefore, according to the jointing method, the joint between the concrete structure formed of the first fresh concrete and the resin member and the joint between the concrete structure formed of the second fresh concrete and the resin member are provided. In the above, high integrity and water-stopping property are obtained by a chemical reaction generated by tobermorite, and as a result, high integrity and water-stopping property are obtained in a joint portion of concrete.

樹脂部材の表側の面及び裏側の面のうち少なくとも一方は凹凸形状をなすこととしてもよい。この構成によれば、樹脂部材の凹凸形状をなす面において、硬化後のコンクリート構造物と樹脂部材との一体性が機械的に向上する。また、凹凸形状がせん断キーとして機能するので、コンクリート構造物と樹脂部材との間でせん断応力の伝達が可能になる。   At least one of the front side surface and the back side surface of the resin member may have an uneven shape. According to this configuration, on the surface of the resin member having the uneven shape, the integrity of the cured concrete structure and the resin member is mechanically improved. In addition, since the uneven shape functions as a shear key, it becomes possible to transmit shear stress between the concrete structure and the resin member.

本発明のコンクリートの打継方法は、第１のフレッシュコンクリートを、熱可塑性樹脂とシリカ成分とを含む第１の樹脂部材の表側の面に接触した状態で硬化させる第１硬化工程と、第１硬化工程の後、第１の樹脂部材の裏側の面と、熱可塑性樹脂とシリカ成分とを含む第２の樹脂部材の裏側の面と、を溶着させる樹脂部材溶着工程と、樹脂部材溶着工程の後、第２のフレッシュコンクリートを、第２の樹脂部材の表側の面に接触した状態で硬化させる第２硬化工程と、を備える。   The method for transferring concrete of the present invention includes a first hardening step of hardening a first fresh concrete in contact with a front surface of a first resin member containing a thermoplastic resin and a silica component; After the curing step, a resin member welding step of welding the back surface of the first resin member and a back surface of the second resin member containing the thermoplastic resin and the silica component, and a resin member welding step And a second hardening step of hardening the second fresh concrete in a state of being in contact with the front surface of the second resin member.

上記打継方法によれば、第１のフレッシュコンクリートで形成されるコンクリート構造物と第１の樹脂部材との接合部、及び第２のフレッシュコンクリートで形成されるコンクリート構造物と第２の樹脂部材との接合部では、トバモライトが生成する化学反応によって高い一体性と止水性とが得られる。また、第１の樹脂部材と第２の樹脂部材との接合部においても、熱可塑性樹脂同士の溶着によって、高い一体性と止水性とが得られる。その結果、コンクリートの打継部において高い一体性と止水性とが得られる。   According to the above joint method, a joint between a concrete structure formed of the first fresh concrete and the first resin member, and a concrete structure formed of the second fresh concrete and the second resin member At the junction with the, high integrity and water stoppage are obtained by a chemical reaction generated by tobermorite. Further, also at the joint portion between the first resin member and the second resin member, high integrity and water stopping property can be obtained by welding the thermoplastic resins to each other. As a result, high integrity and waterproofness are obtained at the joint of concrete.

第１の樹脂部材の表側の面及び第２の樹脂部材の表側の面は凹凸形状をなすこととしてもよい。この構成によれば、硬化後のコンクリート構造物と樹脂部材との一体性が機械的に向上する。また、凹凸形状がせん断キーとして機能し、硬化後のコンクリート構造物と樹脂部材との間でせん断応力の伝達が可能になる。   The front surface of the first resin member and the front surface of the second resin member may have an uneven shape. According to this configuration, the integrity of the hardened concrete structure and the resin member is mechanically improved. Further, the uneven shape functions as a shear key, and shear stress can be transmitted between the hardened concrete structure and the resin member.

本発明は、コンクリートの打継部における高い一体性と止水性とが得られるコンクリートの打継方法を提供することができる。   ADVANTAGE OF THE INVENTION This invention can provide the joining method of the concrete in which the high integration and the water stoppage in the joining part of concrete are obtained.

（ａ）〜（ｃ）は、第１実施形態に係るコンクリートの打継方法の各段階の状態を示す断面図である。(A)-(c) is sectional drawing which shows the state of each step of the method of transferring concrete which concerns on 1st Embodiment. （ａ），（ｂ）は、第１実施形態に係るコンクリートの打継方法の各段階の状態を図１に続き示す断面図である。(A), (b) is sectional drawing which shows the state of each step of the concrete joining method which concerns on 1st Embodiment following FIG. （ａ）〜（ｃ）は、第２実施形態に係るコンクリートの打継方法の各段階の状態を示す断面図である。(A)-(c) is sectional drawing which shows the state of each stage of the method of transferring concrete which concerns on 2nd Embodiment. （ａ）〜（ｃ）は、第２実施形態に係るコンクリートの打継方法の各段階の状態を図３に続き示す断面図である。(A)-(c) is sectional drawing which shows the state of each step of the method of joining concrete according to 2nd Embodiment following FIG. （ａ）は、樹脂部材の表面の一例を拡大して示す平面図であり、（ｂ）は、その樹脂部材の断面図である。(A) is a top view which expands and shows an example of the surface of a resin member, (b) is sectional drawing of the resin member.

〔第１実施形態〕
以下、図面を参照しつつ本発明に係るコンクリートの打継方法の第１実施形態について詳細に説明する。 [First Embodiment]
Hereinafter, a first embodiment of a method for transferring concrete according to the present invention will be described in detail with reference to the drawings.

本実施形態の打継方法は、旧コンクリート構造物１に新コンクリート構造物２を打継ぎする際に、打継部に樹脂部材を介在させるものである。この打継方法は、例えば道路床版の建造等に使用される。本実施形態の打設方法で使用される樹脂部材９（図１参照）は、薄板状又はシート状をなしており熱可塑性樹脂を主成分とする。この熱可塑性樹脂としては、例えば、ポリプロピレン（ＰＰ）、ポリカーボネート（ＰＣ）、ＡＢＳ樹脂、ナイロン、ＥＶＡ樹脂等が使用される。樹脂部材９は、ポリマーセメント、砂、石灰石微粉末、繊維等の異種材料を含有してもよい。また、樹脂部材９は、シリカ(SiO2)成分を含有している。シリカ源としてフライアッシュが樹脂部材９に含有されてもよい。 In the joint method of the present embodiment, when joining the new concrete structure 2 to the old concrete structure 1, a resin member is interposed in the joint portion. This connection method is used, for example, for building a road slab. The resin member 9 (see FIG. 1) used in the casting method of the present embodiment has a thin plate or sheet shape, and contains a thermoplastic resin as a main component. As the thermoplastic resin, for example, polypropylene (PP), polycarbonate (PC), ABS resin, nylon, EVA resin and the like are used. The resin member 9 may contain different materials such as polymer cement, sand, limestone fine powder, and fiber. The resin member 9 contains a silica (SiO 2 ) component. Fly ash may be contained in the resin member 9 as a silica source.

樹脂部材９の一方側の面は凹凸形状をなしており、その裏面側の面はほぼ平坦な平面をなしている。以下では、樹脂部材９の凹凸形状をなす面を「表面９ａ」とし、その裏面側でほぼ平坦な平面をなす面を「裏面９ｂ」とする。詳細は後述するが、表面９１ａは、旧コンクリート構造物１を形成するフレッシュコンクリート１１を硬化させる際に、当該フレッシュコンクリート１１に接する側の面である。なお、各図面においては表面９ａの凹凸形状が誇張され模式的に表されており、図上の凹凸の寸法比は実物とは一致しない。   The surface on one side of the resin member 9 has an uneven shape, and the surface on the back surface has a substantially flat surface. Hereinafter, the surface of the resin member 9 having the uneven shape is referred to as “front surface 9a”, and the surface that forms a substantially flat surface on the back surface side is referred to as “back surface 9b”. Although details will be described later, the surface 91a is a surface that is in contact with the fresh concrete 11 when the fresh concrete 11 forming the old concrete structure 1 is hardened. In each of the drawings, the irregularities on the surface 9a are exaggerated and schematically shown, and the dimensional ratio of the irregularities on the drawings does not match the actual one.

本実施形態の打継方法は、第１硬化工程と第２硬化工程とを備える。第１硬化工程では、フレッシュコンクリート１１（第１のフレッシュコンクリート）を樹脂部材９の表面９ａに接触した状態で硬化させて旧コンクリート構造物１を形成する。第２硬化工程では、フレッシュコンクリート１２（第２のフレッシュコンクリート）を樹脂部材９の裏面９ｂに接触した状態で硬化させて新コンクリート構造物２を形成する。以下、第１硬化工程及び第２硬化工程の具体的な手法の一例を説明する。   The transfer method according to the present embodiment includes a first curing step and a second curing step. In the first hardening step, the old concrete structure 1 is formed by hardening the fresh concrete 11 (first fresh concrete) in contact with the surface 9 a of the resin member 9. In the second hardening step, the new concrete structure 2 is formed by hardening the fresh concrete 12 (the second fresh concrete) in contact with the back surface 9 b of the resin member 9. Hereinafter, an example of a specific method of the first curing step and the second curing step will be described.

（第１硬化工程）
図１（ａ）に示されるように、コンクリート型枠３が組立てられ、型枠３の型枠面の一部に樹脂部材９が設置される。このとき、樹脂部材９の裏面９ｂが型枠面に貼着され、表面９ａが型枠３の内側に向けられた状態になる。その後、図１（ｂ）に示されるように、コンクリート型枠３内にフレッシュコンクリート１１が投入される。詳細な図示は省略するが、フレッシュコンクリート１１が投入される空間には鉄筋が予め設置されてもよい。投入されたフレッシュコンクリート１１は、樹脂部材９の表面９ａに接触した状態で硬化し、旧コンクリート構造物１となる。 (First curing step)
As shown in FIG. 1A, a concrete form 3 is assembled, and a resin member 9 is installed on a part of the form surface of the form 3. At this time, the back surface 9b of the resin member 9 is stuck to the mold surface, and the front surface 9a is directed to the inside of the mold 3. Thereafter, as shown in FIG. 1B, the fresh concrete 11 is put into the concrete form 3. Although not shown in detail, a reinforcing bar may be previously installed in a space where the fresh concrete 11 is charged. The poured fresh concrete 11 is hardened while being in contact with the surface 9 a of the resin member 9, and becomes the old concrete structure 1.

（第２硬化工程）
続いて、図１（ｃ）に示されるように、樹脂部材９が貼着された型枠３の一部は除去されて、旧コンクリート構造物１の一端面に樹脂部材９が固定された状態となり、樹脂部材９の裏面９ｂが露出される。その後、新コンクリート構造物２を成形するための新たな型枠５が、樹脂部材９の裏面９ｂ側に組立てられる。そして、図２（ａ）に示されるように、この型枠５内にフレッシュコンクリート１２が投入される。投入されたフレッシュコンクリート１２は、樹脂部材９の裏面９ｂに接触した状態で硬化し、新コンクリート構造物２となる。その後、図２（ｂ）に示されるように、型枠５は除去される。 (Second curing step)
Subsequently, as shown in FIG. 1C, a part of the mold 3 to which the resin member 9 is adhered is removed, and the resin member 9 is fixed to one end surface of the old concrete structure 1. And the back surface 9b of the resin member 9 is exposed. Thereafter, a new formwork 5 for forming the new concrete structure 2 is assembled on the back surface 9 b side of the resin member 9. Then, as shown in FIG. 2A, fresh concrete 12 is put into the formwork 5. The poured fresh concrete 12 is hardened in a state of being in contact with the back surface 9b of the resin member 9, and becomes a new concrete structure 2. Thereafter, as shown in FIG. 2B, the mold 5 is removed.

以上によって、旧コンクリート構造物１に対し樹脂部材９を介して新コンクリート構造物２が打継ぎされた構造が完成する。次に、上記のコンクリートの打継方法による作用効果について説明する。   Thus, a structure in which the new concrete structure 2 is connected to the old concrete structure 1 via the resin member 9 is completed. Next, the operation and effect of the above-described method for transferring concrete will be described.

フレッシュコンクリート１１が硬化する際には、セメントの水和反応過程において、樹脂部材９に含まれるシリカ成分とフレッシュコンクリート１１に含まれる水酸化カルシウムとの化学反応によって、珪酸カルシウム水和物の一種であるトバモライト(5CaO・6SiO2・5H2O)が生成する。よって、第１硬化工程において旧コンクリート構造物１と樹脂部材９とが、トバモライトが生成する化学反応によって高い一体性で接合されると共に、旧コンクリート構造物１と樹脂部材９との接合部の止水性も高い。同様の理由により、第２硬化工程において新コンクリート構造物２と樹脂部材９とが高い一体性で接合されると共に、新コンクリート構造物２と樹脂部材９との接合部の止水性も高い。また、樹脂部材９自体は、その材料の性質上、もともと高い止水性を備えている。その結果、旧コンクリート構造物１と新コンクリート構造物２との打継部における高い一体性と高い止水性が得られる。従って、コンクリートの劣化因子が打継部から侵入することを抑制することができ、コンクリート構造物の耐久性が向上する。 When the fresh concrete 11 hardens, it is a kind of calcium silicate hydrate due to a chemical reaction between a silica component contained in the resin member 9 and calcium hydroxide contained in the fresh concrete 11 during a hydration reaction process of cement. there tobermorite (5CaO · 6SiO 2 · 5H 2 O) is produced. Therefore, in the first hardening step, the old concrete structure 1 and the resin member 9 are joined with high integrity by a chemical reaction generated by tobermorite, and the joint between the old concrete structure 1 and the resin member 9 is stopped. Aqueous is also high. For the same reason, in the second hardening step, the new concrete structure 2 and the resin member 9 are joined with high integrity, and the joint between the new concrete structure 2 and the resin member 9 also has high water stopping performance. In addition, the resin member 9 itself originally has a high water stopping property due to the nature of the material. As a result, high integration and high waterproofness at the joint between the old concrete structure 1 and the new concrete structure 2 can be obtained. Therefore, it is possible to prevent the deterioration factor of the concrete from entering from the joint portion, and the durability of the concrete structure is improved.

また、樹脂部材９の表面９ａが凹凸形状をなしているので、旧コンクリート構造物１と樹脂部材９との一体性が機械的に向上する。また、表面９ａの凹凸形状がせん断キーとして機能し、旧コンクリート構造物１と樹脂部材９との間でせん断応力の伝達が可能になる。   Further, since the surface 9a of the resin member 9 has an uneven shape, the integrity of the old concrete structure 1 and the resin member 9 is mechanically improved. In addition, the uneven shape of the surface 9a functions as a shear key, and shear stress can be transmitted between the old concrete structure 1 and the resin member 9.

また、本実施形態の打継方法と比較し、打継されるコンクリート構造物の間でせん断応力の伝達を可能にする他の方法として、次のようなものも考えられる。まず、コンクリートの打継面に凹凸シートが接した状態で硬化させて旧コンクリート構造物を形成する。その後、凹凸シートを除去して露出した打継面に新コンクリートを打継する。このとき、旧コンクリートの打継面の乾燥により、完成後の打継面の品質が低下する虞がある。または、新コンクリートを打設する前に、旧コンクリートの打継面に給水する作業が行われる場合もあるが、この給水作業の手間や時間が発生する。これに対し、本実施形態の打継方法によれば、新コンクリートの打設時に旧コンクリートの打継面の状態を管理する手間及び時間が低減され、工期短縮を図ることができる。   In addition, as compared with the joint method of the present embodiment, the following method is also conceivable as another method capable of transmitting shear stress between concrete structures to be jointed. First, an old concrete structure is formed by curing in a state where the uneven sheet is in contact with the joint surface of concrete. Then, new concrete is transferred to the exposed connection surface after removing the uneven sheet. At this time, the quality of the joint surface after completion may be reduced due to drying of the joint surface of the old concrete. Alternatively, there is a case where water is supplied to the joint surface of the old concrete before the new concrete is poured. However, labor and time for the water supply work are required. On the other hand, according to the jointing method of the present embodiment, the time and effort for managing the state of the jointing surface of the old concrete when the new concrete is poured can be reduced, and the construction period can be shortened.

また、更に他の打継方法として、旧コンクリートの打継面にエポキシ樹脂系接着剤を塗布した後、当該打継面に新コンクリートを打継するといった方法も考えられる。この方法では、接着剤を塗布する手間及び時間が発生する。これに対し、本実施形態の打継方法によれば、樹脂部材９に接触した状態でフレッシュコンクリート１１を硬化させればよく、その具体的な一つの方法として、型枠３の内壁面に予め樹脂部材９を仕込んでおけばよい。従って、本実施形態の打継方法によれば、上記のように接着剤を用いる打継方法と比較しても手間及び時間が低減され、工期短縮を図ることができる。   Further, as another joining method, a method of applying an epoxy resin-based adhesive to the joining surface of the old concrete and then joining the new concrete to the joining surface is also conceivable. In this method, labor and time for applying the adhesive are required. On the other hand, according to the transfer method of the present embodiment, the fresh concrete 11 may be hardened while being in contact with the resin member 9. The resin member 9 may be charged. Therefore, according to the joining method of the present embodiment, the labor and time are reduced as compared with the joining method using an adhesive as described above, and the construction period can be shortened.

〔第２実施形態〕
続いて、コンクリートの打継方法の第２実施形態について詳細に説明する。本実施形態において、前述の第１実施形態と同一又は同等な構成部分には同一符号を付し重複する説明を省略する。 [Second embodiment]
Subsequently, a second embodiment of the method of transferring concrete will be described in detail. In the present embodiment, the same or equivalent components as those in the above-described first embodiment are denoted by the same reference numerals, and redundant description will be omitted.

本実施形態の打継方法は、旧コンクリート構造物１に新コンクリート構造物２を打継ぎする際に、２枚の樹脂部材９を介在させる点において第１実施形態とは異なっている。本実施形態の打設方法で使用される２枚の樹脂部材９を互いに区別するために、以下では、それぞれを樹脂部材９１（第１の樹脂部材）、樹脂部材９２（第２の樹脂部材）と呼ぶ場合がある。また、樹脂部材９１の凹凸形状をなす面を「表面９１ａ」とし、その裏面側でほぼ平坦な平面をなす面を「裏面９１ｂ」とする。同様に、樹脂部材９２の凹凸形状をなす面を「表面９２ａ」とし、その裏面側でほぼ平坦な平面をなす面を「裏面９２ｂ」とする。詳細は後述するが、表面９１ａ，９２ａは、ともに、硬化中のフレッシュコンクリート１１，１２に接する側の面である。   The joint method of the present embodiment differs from the first embodiment in that two resin members 9 are interposed when the new concrete structure 2 is joined to the old concrete structure 1. In order to distinguish the two resin members 9 used in the casting method of the present embodiment from each other, each of them is hereinafter referred to as a resin member 91 (first resin member) and a resin member 92 (second resin member). It may be called. The surface of the resin member 91 having the uneven shape is referred to as “front surface 91a”, and the surface that forms a substantially flat surface on the back surface side is referred to as “back surface 91b”. Similarly, the surface of the resin member 92 having the uneven shape is referred to as “front surface 92a”, and the surface that forms a substantially flat surface on the back surface side is referred to as “back surface 92b”. Although the details will be described later, the surfaces 91a and 92a are both surfaces in contact with the hardening fresh concretes 11 and 12.

本実施形態の打継方法は、第１硬化工程と、樹脂部材溶着工程と、第２硬化工程と、を備える。第１硬化工程では、フレッシュコンクリート１１を樹脂部材９１の表面９１ａに接触した状態で硬化させて旧コンクリート構造物１を形成する。樹脂部材溶着工程では、第１硬化工程の後、樹脂部材９１の裏面９１ｂと樹脂部材９２の裏面９２ｂとを溶着させて、樹脂部材９１，９２を一体化させる。第２硬化工程では、フレッシュコンクリート１２を樹脂部材９２の表面９２ａに接触した状態で硬化させて新コンクリート構造物２を形成する。以下、第１硬化工程、樹脂部材溶着工程及び第２硬化工程の具体的な手法の一例を説明する。   The joining method according to the present embodiment includes a first curing step, a resin member welding step, and a second curing step. In the first hardening step, the old concrete structure 1 is formed by hardening the fresh concrete 11 in contact with the surface 91 a of the resin member 91. In the resin member welding step, after the first curing step, the back surface 91b of the resin member 91 and the back surface 92b of the resin member 92 are welded to integrate the resin members 91 and 92. In the second hardening step, the fresh concrete 12 is hardened while being in contact with the surface 92 a of the resin member 92 to form the new concrete structure 2. Hereinafter, an example of a specific method of the first curing step, the resin member welding step, and the second curing step will be described.

（第１硬化工程）
図３（ａ）に示されるように、型枠３の型枠面の一部に樹脂部材９１が設置された状態で、図３（ｂ）に示されるように、コンクリート型枠３内にフレッシュコンクリート１１が投入される。投入されたフレッシュコンクリート１１は、樹脂部材９１の表面９１ａに接触した状態で硬化し、旧コンクリート構造物１となる。詳細は第１実施形態における第１硬化工程と同様である。 (First curing step)
As shown in FIG. 3 (a), in a state where the resin member 91 is installed on a part of the mold surface of the mold 3, as shown in FIG. Concrete 11 is charged. The poured fresh concrete 11 hardens in a state of being in contact with the surface 91 a of the resin member 91, and becomes the old concrete structure 1. The details are the same as in the first curing step in the first embodiment.

（樹脂部材溶着工程）
続いて、樹脂部材９１が貼着された型枠３の一部は除去されて、旧コンクリート構造物１の一端面に樹脂部材９１が固定された状態となり、樹脂部材９１の裏面９１ｂが露出される。詳細は、第１実施形態で説明した図１（ｃ）の状態と同様である。その後、図３（ｃ）に示されるように、樹脂部材９１の裏面９１ｂに対して、樹脂部材９２の裏面９２ｂが溶着されて、樹脂部材９１，９２が一体化される。 (Resin member welding process)
Subsequently, a part of the mold 3 to which the resin member 91 is adhered is removed, and the resin member 91 is fixed to one end surface of the old concrete structure 1, and the back surface 91b of the resin member 91 is exposed. You. Details are the same as the state of FIG. 1C described in the first embodiment. Then, as shown in FIG. 3C, the back surface 92b of the resin member 92 is welded to the back surface 91b of the resin member 91, and the resin members 91 and 92 are integrated.

溶着の具体的な手法としては、まず、樹脂部材９１の裏面９１ｂと、樹脂部材９２の裏面９２ｂとが加熱され溶融する。このときの樹脂部材９１，９２の加熱温度は、樹脂部材９１，９２の材料の特性に合わせて設定されればよく、例えば８０〜５００℃である。樹脂部材９１，９２の加熱方法としては、種々の加熱方法を採用することができる。樹脂部材９１，９２は、例えば、ヒーターや電熱線等で加熱されてもよく、レーザや電磁誘導を利用した加熱方法により加熱されてもよい。電熱線が予め樹脂部材９１，９２に仕込まれていてもよい。また、樹脂部材９１の裏面９１ｂと樹脂部材９２の裏面９２ｂとの間に高温の金属板材等を挟み込むといった加熱方法が採用されてもよい。   As a specific welding method, first, the back surface 91b of the resin member 91 and the back surface 92b of the resin member 92 are heated and melted. The heating temperature of the resin members 91 and 92 at this time may be set according to the characteristics of the material of the resin members 91 and 92, and is, for example, 80 to 500 ° C. As a method of heating the resin members 91 and 92, various heating methods can be adopted. The resin members 91 and 92 may be heated by, for example, a heater or a heating wire, or may be heated by a heating method using laser or electromagnetic induction. A heating wire may be charged in the resin members 91 and 92 in advance. Further, a heating method of sandwiching a high-temperature metal plate or the like between the back surface 91b of the resin member 91 and the back surface 92b of the resin member 92 may be adopted.

上記加熱の後、樹脂部材９１の裏面９１ｂに対して樹脂部材９２の裏面９２ｂが押し付けられ加圧される。その後、加圧の継続中において、樹脂部材９１，９２が放熱により温度低下し再硬化すると、樹脂部材９１，９２が溶着され一体化される。   After the above-mentioned heating, the back surface 92b of the resin member 92 is pressed against the back surface 91b of the resin member 91 and is pressed. Thereafter, while the pressurization is continued, when the temperature of the resin members 91 and 92 decreases due to heat radiation and re-hardens, the resin members 91 and 92 are welded and integrated.

なお、樹脂部材９１，９２を溶着させる方法としては、振動溶着法が採用されてもよい。振動溶着法を採用する場合、樹脂部材９１，９２を圧着させ、例えば、周波数約２００Ｈｚ，振幅１〜５ｍｍで樹脂部材９１，９２のうちの一方を往復動させる。上記の往復動により樹脂部材９１，９２の間に摩擦熱が発生し、当該摩擦熱によって樹脂部材９１，９２が溶融する。また、振動溶着法を採用する場合、樹脂部材９１，９２は摩擦力が伝達しやすい形状であることが必要であり、また樹脂の溶け代や溶けた樹脂の逃げ道が必要である。この観点から、樹脂部材９１，９２の裏面９１ｂ、９２ｂの全面に、例えば、図５に拡大して示されるように格子状に多数のＶ溝２３を形成してもよい。この場合、Ｖ溝２３同士の間隔は３〜１０ｍｍとすることが好ましい。   As a method of welding the resin members 91 and 92, a vibration welding method may be adopted. When the vibration welding method is adopted, the resin members 91 and 92 are pressed, and one of the resin members 91 and 92 is reciprocated at a frequency of about 200 Hz and an amplitude of 1 to 5 mm, for example. The reciprocating motion generates frictional heat between the resin members 91 and 92, and the frictional heat causes the resin members 91 and 92 to melt. When the vibration welding method is adopted, the resin members 91 and 92 need to have a shape that easily transmits a frictional force, and a margin for melting the resin and an escape route for the melted resin are required. From this viewpoint, a large number of V-grooves 23 may be formed in a grid pattern on the entire surfaces of the back surfaces 91b and 92b of the resin members 91 and 92, for example, as shown in an enlarged view in FIG. In this case, it is preferable that the interval between the V grooves 23 is 3 to 10 mm.

（第２硬化工程）
その後、図４（ａ）に示されるように、新コンクリート構造物２を成形するための新たな型枠５が、樹脂部材９２の表面９２ａ側に組立てられる。そして、図４（ｂ）に示されるように、この型枠５内にフレッシュコンクリート１２が投入される。投入されたフレッシュコンクリート１２は、樹脂部材９の表面９２ａに接触した状態で硬化し、新コンクリート構造物２となる。その後、図４（ｃ）に示されるように、型枠５は除去される。 (Second curing step)
Thereafter, as shown in FIG. 4A, a new formwork 5 for forming the new concrete structure 2 is assembled on the surface 92a side of the resin member 92. Then, as shown in FIG. 4B, fresh concrete 12 is put into the formwork 5. The poured fresh concrete 12 is hardened while being in contact with the surface 92 a of the resin member 9, and becomes a new concrete structure 2. Thereafter, as shown in FIG. 4C, the mold 5 is removed.

以上によって、旧コンクリート構造物１に対し樹脂部材９１，９２を介して新コンクリート構造物２が打継ぎされた構造が完成する。次に、上記のコンクリートの打継方法による作用効果について説明する。   Thus, a structure in which the new concrete structure 2 is connected to the old concrete structure 1 via the resin members 91 and 92 is completed. Next, the operation and effect of the above-described method for transferring concrete will be described.

第１硬化工程において旧コンクリート構造物１と樹脂部材９１とが、トバモライトを生成する化学反応によって高い一体性で接合されると共に、旧コンクリート構造物１と樹脂部材９１との接合部の止水性も高い。同様の理由により、第２硬化工程において新コンクリート構造物２と樹脂部材９２とが高い一体性で接合されると共に、新コンクリート構造物２と樹脂部材９２との接合部の止水性も高い。樹脂部材９１と樹脂部材９２とは溶着によって一体化されるので、両者の接合部も高い一体性と止水性を示す。また、樹脂部材９１及び樹脂部材９２自体は、樹脂材料の性質上、もともと高い止水性を備えている。その結果、旧コンクリート構造物１と新コンクリート構造物２との打継部における高い一体性と高い止水性が得られる。   In the first curing step, the old concrete structure 1 and the resin member 91 are joined with a high degree of integrity by a chemical reaction that generates tobermorite, and the joint between the old concrete structure 1 and the resin member 91 also has a waterproof property. high. For the same reason, in the second hardening step, the new concrete structure 2 and the resin member 92 are joined with a high degree of integrity, and the junction between the new concrete structure 2 and the resin member 92 also has a high water stopping property. Since the resin member 91 and the resin member 92 are integrated by welding, the joint between the two also exhibits high integrity and water-blocking properties. In addition, the resin member 91 and the resin member 92 themselves originally have high water stopping properties due to the properties of the resin material. As a result, high integration and high waterproofness at the joint between the old concrete structure 1 and the new concrete structure 2 can be obtained.

また、樹脂部材９１の表面９１ａが凹凸形状をなしているので、旧コンクリート構造物１と樹脂部材９１との一体性が機械的に向上する。同様の理由により、新コンクリート構造物２と樹脂部材９２との一体性が機械的に向上する。その結果、旧コンクリート構造物１と新コンクリート構造物２との一体性が機械的に向上する。また、表面９１ａの凹凸形状がせん断キーとして機能し、旧コンクリート構造物１と樹脂部材９１との間でせん断応力の伝達が可能になる。同様の理由により、新コンクリート構造物２と樹脂部材９２との間でせん断応力の伝達が可能になる。その結果、旧コンクリート構造物１と新コンクリート構造物２との間でせん断応力の伝達が可能になる。   Further, since the surface 91a of the resin member 91 has an uneven shape, the integrity of the old concrete structure 1 and the resin member 91 is mechanically improved. For the same reason, the integrity of the new concrete structure 2 and the resin member 92 is mechanically improved. As a result, the integrity of the old concrete structure 1 and the new concrete structure 2 is mechanically improved. In addition, the uneven shape of the surface 91a functions as a shear key, and shear stress can be transmitted between the old concrete structure 1 and the resin member 91. For the same reason, transmission of shear stress between the new concrete structure 2 and the resin member 92 becomes possible. As a result, transmission of shear stress between the old concrete structure 1 and the new concrete structure 2 becomes possible.

本発明は、上述した実施形態を始めとして、当業者の知識に基づいて種々の変更、改良を施した様々な形態で実施することができる。また、上述した実施形態に記載されている技術的事項を利用して、実施例の変形例を構成することも可能である。各実施形態の構成を適宜組み合わせて使用してもよい。   The present invention can be implemented in various forms including various modifications and improvements based on the knowledge of those skilled in the art, including the above-described embodiment. Further, it is also possible to configure a modification of the embodiment using the technical matters described in the above-described embodiment. The configurations of the embodiments may be appropriately combined and used.

実施形態では、フレッシュコンクリート１１を樹脂部材９に接触した状態で硬化させるための手法として、型枠３の内壁面に予め樹脂部材９を貼着するようにしているが、この手法には限定されない。例えば、自立可能な程度の剛性の大きい樹脂部材９を埋設型枠として使用してもよい。これにより、型枠の撤去作業も省くことができる。また、フレッシュコンクリート１１が硬化前に自立可能である場合等には、型枠３を使用せずにフレッシュコンクリート１１を硬化させてもよく、このとき、硬化前のフレッシュコンクリート１１の一端面に樹脂部材９を直接貼着してもよい。   In the embodiment, as a method for curing the fresh concrete 11 in contact with the resin member 9, the resin member 9 is pasted to the inner wall surface of the form 3 in advance, but is not limited to this method. . For example, a resin member 9 having a large rigidity enough to be self-supporting may be used as the embedded mold. Thereby, the work of removing the formwork can be omitted. In the case where the fresh concrete 11 can be self-supported before hardening, the fresh concrete 11 may be hardened without using the formwork 3. At this time, one end surface of the fresh concrete 11 before hardening is applied to the resin. The member 9 may be directly adhered.

また、第２実施形態では、２枚の樹脂部材９の裏面同士を溶着させることで、フレッシュコンクリート１１，１２の双方に凹凸形状の面を接触させるようにしている。この手法に代え、第１実施形態において、表裏両面が凹凸形状をなすような樹脂部材を使用してもよい。また、樹脂部材の表裏面の少なくとも一方が凹凸形状であることも必須ではなく、各実施形態で用いられる樹脂部材９に代えて、表裏両面がほぼ平坦な樹脂部材を用いてもよい。   In the second embodiment, the back surfaces of the two resin members 9 are welded to each other so that the surfaces of the irregularities are brought into contact with both the fresh concretes 11 and 12. Instead of this method, in the first embodiment, a resin member whose front and back surfaces have irregularities may be used. Further, it is not essential that at least one of the front and back surfaces of the resin member has an uneven shape. Instead of the resin member 9 used in each embodiment, a resin member having substantially flat front and back surfaces may be used.

第１実施形態、第２実施形態のいずれにおいても、打継部にプレストレスを導入することにより、一体性および曲げ抵抗性を向上させても良い。   In any of the first embodiment and the second embodiment, prestress may be introduced into the joint to improve the integrity and the bending resistance.

９…樹脂部材、９ａ…表面（表側の面）、９ｂ…裏面（裏側の面）、１１…フレッシュコンクリート（第１のフレッシュコンクリート）、１２…フレッシュコンクリート（第２のフレッシュコンクリート）、９１…樹脂部材（第１の樹脂部材）、９１ａ…表面（表側の面）、９１ｂ…裏面（裏側の面）、９２…樹脂部材（第２の樹脂部材）、９２ａ…表面（表側の面）、９２ｂ…裏面（裏側の面）。   9: resin member, 9a: front surface (front surface), 9b: back surface (back surface), 11: fresh concrete (first fresh concrete), 12: fresh concrete (second fresh concrete), 91: resin Member (first resin member), 91a front surface (front side surface), 91b back surface (back side surface), 92 resin member (second resin member), 92a front surface (front side surface), 92b ... Back side (back side).

Claims (4)

第１のフレッシュコンクリートを、シリカ成分を含む樹脂部材の表側の面に接触した状態で硬化させる第１硬化工程と、
第２のフレッシュコンクリートを、前記樹脂部材の裏側の面に接触した状態で硬化させる第２硬化工程と、を備える、コンクリートの打継方法。 A first hardening step of hardening the first fresh concrete in a state of being in contact with the front surface of the resin member containing a silica component;
A second hardening step of hardening the second fresh concrete in a state of being in contact with the surface on the back side of the resin member. 前記樹脂部材の前記表側の面及び前記裏側の面のうち少なくとも一方は凹凸形状をなす、請求項１に記載のコンクリートの打継方法。   The method according to claim 1, wherein at least one of the front surface and the rear surface of the resin member has an uneven shape. 第１のフレッシュコンクリートを、熱可塑性樹脂とシリカ成分とを含む第１の樹脂部材の表側の面に接触した状態で硬化させる第１硬化工程と、
前記第１硬化工程の後、前記第１の樹脂部材の裏側の面と、熱可塑性樹脂とシリカ成分とを含む第２の樹脂部材の裏側の面と、を溶着させる樹脂部材溶着工程と、
前記樹脂部材溶着工程の後、第２のフレッシュコンクリートを、前記第２の樹脂部材の表側の面に接触した状態で硬化させる第２硬化工程と、を備える、コンクリートの打継方法。 A first hardening step of hardening the first fresh concrete in a state in which the first fresh concrete is in contact with the front surface of the first resin member containing the thermoplastic resin and the silica component;
After the first curing step, a resin member welding step of welding the back surface of the first resin member and the back surface of the second resin member containing a thermoplastic resin and a silica component,
A second hardening step of hardening the second fresh concrete in a state in which the second fresh concrete is in contact with the front surface of the second resin member after the resin member welding step. 前記第１の樹脂部材の前記表側の面及び前記第２の樹脂部材の前記表側の面は凹凸形状をなす、請求項３に記載のコンクリートの打継方法。
4. The method according to claim 3, wherein the front surface of the first resin member and the front surface of the second resin member have irregular shapes. 5.
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JP7434052B2 (en) 2020-05-15 2024-02-20 戸田建設株式会社 How to treat vertical concrete joints

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JPH07166698A (en) * 1993-12-15 1995-06-27 Toyobo Co Ltd Concrete placement form
JP2002129746A (en) * 2000-10-19 2002-05-09 Izaki Kogyo:Kk Waterproof structure of placing joint
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7434052B2 (en) 2020-05-15 2024-02-20 戸田建設株式会社 How to treat vertical concrete joints

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