JP5687162B2 - Overhang head rail structure in concrete dam and overhang head rail construction method - Google Patents

Overhang head rail structure in concrete dam and overhang head rail construction method Download PDF

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JP5687162B2
JP5687162B2 JP2011192333A JP2011192333A JP5687162B2 JP 5687162 B2 JP5687162 B2 JP 5687162B2 JP 2011192333 A JP2011192333 A JP 2011192333A JP 2011192333 A JP2011192333 A JP 2011192333A JP 5687162 B2 JP5687162 B2 JP 5687162B2
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overhang
lift
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steel material
rail member
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清 野稲
清 野稲
玄 田坂
玄 田坂
敏弘 永松
敏弘 永松
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Sato Kogyo Co Ltd
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Description

本発明はコンクリートダムにおける張出部高欄部構造及び張出部高欄部施工方法
に関し、詳しくはコンクリートダム天端部の張出部と高欄部とをプレキャストコンクリート化した構造とその施工方法に関する。
TECHNICAL FIELD The present invention relates to an overhang structure for a concrete dam and a construction method for an overhang section, and more particularly to a structure in which the overhang and an overhang at the top end of a concrete dam are precast concrete and a construction method therefor.

コンクリートダム堤頂部には、通行者(車)等の落下を防止するために高欄部が設けれられている。また、この高欄部が設置される部分であるダム堤体頂部は、上下流部において張出部が設けられている。   An overhead rail is provided on the top of the concrete dam in order to prevent a passerby (car) or the like from falling. Moreover, the dam dam body top part which is a part in which this handrail part is installed is provided with the overhang | projection part in the upstream / downstream part.

従来、この張出部の施工は、ダム堤体の施工が終了してダム用型枠を撤去した後、足場用ブラケットを設置し、該ブラケット上に足場を組立て、張出部用の型枠支保工を組立て、型枠内に鉄筋を組立て(配筋)た後、コンクリート打設を行うという施工方法を採っている。   Conventionally, the construction of this overhang has been done after the construction of the dam body has been completed and the formwork for the dam has been removed, then the scaffolding bracket is installed, the scaffolding is assembled on the bracket, and the formwork for the overhanging part After assembling the supporting work, assembling the reinforcing bars in the formwork (rebaring), and then placing the concrete.

また、この張出部の上部に設置される高欄部の施工は、上記した張出部のコンクリート打設の後、高欄部の型枠を設置し、鉄筋を組み立てた後、コンクリート打設を行うという施工方法を採ったり、或いは、特許文献1記載の技術のように、予めプレキャストコンクリート製の高欄部を作成しておき、このプレキャスト高欄部をケーブルクレーンにより張出部の上面に据付固定する施工方法を採っている。   In addition, the construction of the balustrade installed on the upper part of the overhanging portion is performed after placing the concrete of the overhanging portion, installing the formwork of the balustrade, assembling the reinforcing bars, and then placing the concrete. The construction method of pre-cast concrete made in advance as in the technique described in Patent Document 1, and installed and fixed to the upper surface of the overhanging portion by a cable crane The method is taken.

高欄部をコンクリート打設する場合、又はプレキャスト高欄部を据付固定する場合のいずれの施工方法であっても、前述したようにダム堤体の施工が終了してダム用型枠を撤去した後での足場用ブラケットの設置、足場組立、型枠支保工組立、鉄筋組立、コンクリート打設、高欄部の設置(コンクリート打設、或いはプレキャスト高欄部の据付固定)、型枠支保工解体・撤去、足場解体・撤去、足場用ブラケットの撤去、の各作業が必須であるため、各作業にかかる工期・手間・専門技能工の確保と配置等を必要とすることから、ダム工事における張出部及び高欄部の設置に際しての省力化・省人化・工程及び工期の短縮化・品質の確保・安全性の確保等の各項目の達成が容易ではないことが判った。   Regardless of the construction method when placing the balustrade in concrete or when installing and fixing the precast balustrade, after the dam dam body construction is completed and the dam formwork is removed as described above Bracket mounting, scaffold assembly, formwork support assembly, rebar assembly, concrete placement, railing installation (concrete placement or precast railing installation and fixing), formwork support dismantling / removal, scaffolding Since each work of dismantling / removal and removal of the bracket for scaffolding is essential, it is necessary to secure and arrange the work period, labor, and specialized technicians for each work. It was found that it was not easy to achieve each item such as labor saving, labor saving, shortening of process and construction period, ensuring quality, ensuring safety, etc.

特許第3663594号Japanese Patent No. 3663594

そこで本発明の課題は、ダム工事における張出部及び高欄部の設置に際しての省力化・省人化・工程及び工期の短縮化・品質の確保・安全性の確保等の各項目の達成が可能なコンクリートダムにおける張出部高欄部構造及び張出部高欄部施工方法を提供することにある。   Therefore, the object of the present invention is to achieve each item such as labor-saving, labor-saving, shortening the process and construction period, ensuring quality, ensuring safety, etc. when installing the overhang and railing in dam construction It is providing the overhang part railing structure in a concrete dam, and the overhang part railing construction method.

上記課題を解決する本発明は、下記構成を有する。   The present invention for solving the above problems has the following configuration.

1.コンクリートダム堤頂部の上下流部における張出部及び高欄部の構造において、
前記張出部と該張出部の上部に配設される高欄部とが、一体化構造を有するプレキャストコンクリートで形成された張出高欄部材から成る構成であり、
上流側に配設した前記張出高欄部材の張出部と下流側に配設した前記張出高欄部材の張出部とが、該2つの張出部間に架け渡し状態で配設される第2補強鋼材によって接続される構成であること、
特徴とするコンクリートダムにおける張出部高欄部構造。
1. In the structure of the overhanging part and the balustrade part in the upstream and downstream part of the concrete dam crest,
The overhang portion and the balustrade portion disposed on the upper portion of the overhang portion are composed of an overhang balustrade member formed of precast concrete having an integrated structure ,
An overhang portion of the overhang rail member disposed on the upstream side and an overhang portion of the overhang rail member disposed on the downstream side are disposed in a stretched state between the two overhang portions. Being connected by the second reinforcing steel material,
Overhanging portion railing section structure in the concrete dam, wherein.

2.前記張出高欄部材が、この部材が配設される堤体の直下のリフトに固着される固着構成によって固定される構成であることを特徴とする上記1に記載のコンクリートダムにおける張出部高欄部構造。 2. 2. The overhanging column in the concrete dam according to the above 1, wherein the overhanging column member is fixed by a fixing configuration that is fixed to a lift immediately below a bank body in which the member is disposed. Part structure.

3.前記固着構成が、
前記張出高欄部材が配設される堤体の直下のリフトに、該リフト上面であって前記張出高欄部材の配設位置より内側部分に上半部が突出するように第1補強鋼材が埋設されており、
前記リフト上面に配設した前記張出高欄部材の張出部が前記第1補強鋼材の上半部に溶接の如き接続手段で接続されることにより固着される構成であること、
を特徴とする上記2に記載のコンクリートダムにおける張出部高欄部構造。
3. The anchoring configuration is
The first reinforcing steel material is provided on the lift directly below the bank body on which the overhang bar member is disposed so that the upper half projects from the upper surface of the lift and on the inner side of the position where the overhang bar member is disposed. Buried,
The projecting portion of the projecting rail member disposed on the upper surface of the lift is configured to be fixed by being connected to the upper half of the first reinforcing steel material by connection means such as welding,
The overhanging railing structure in the concrete dam as described in 2 above.

.前記第1補強鋼材と前記第2補強鋼材とが、溶接の如き接続手段で接続される構成であることを特徴とする上記に記載のコンクリートダムにおける張出部高欄部構造。 4 . 4. The overhanging column structure in a concrete dam as described in 3 above, wherein the first reinforcing steel material and the second reinforcing steel material are connected by connection means such as welding.

.コンクリートダム堤頂部の上下流部における張出部及び高欄部の施工方法において、
前記張出部と該張出部の上部に配設される高欄部とを一体化構造のプレキャストコンクリート製によって予め形成しておき、
この一体化構造のプレキャストコンクリート製の張出部高欄部である張出高欄部材を、該張出高欄部材が配設される直下のリフト上面に据付固定し、
上流側に配設した前記張出高欄部材と下流側に配設した前記張出高欄部材とを、該2つの張出高欄部材の各々の張出部間に架け渡し状態で配設した第2補強鋼材によって接続した後、前記リフト上面であって前記高欄部の下方位置までコンクリートを打設すること、
を特徴とする張出部高欄部施工方法。
5 . In the construction method of the overhanging part and the railing part in the upstream and downstream part of the concrete dam crest part,
The overhang portion and the balustrade portion disposed on the upper portion of the overhang portion are previously formed by precast concrete made of an integrated structure,
The overhang rail member which is the overhang height rail made of precast concrete of this integrated structure is installed and fixed on the upper surface of the lift directly below the overhang rail member ,
The second overhang rail member arranged on the upstream side and the overhang rail member arranged on the downstream side are arranged in a stretched state between the respective overhang portions of the two overhang column members. After connecting with a reinforcing steel material, placing concrete up to the lower position of the balustrade on the upper surface of the lift,
The overhang part railing construction method characterized by this.

.前記張出高欄部材が配設される堤体の直下のリフト打設時に、該リフト上面であって前記張出高欄部材の配設位置より内側部分に上半部が突出するように第1補強鋼材を埋設し、
前記リフト上面に前記張出高欄部材を配設した際に、該張出高欄部材の張出部と前記第1補強鋼材の上半部とを溶接の如き接続手段で接続すること、
を特徴とする上記に記載の張出部高欄部施工方法。
6 . When the lift is placed directly below the bank body on which the overhang bar member is disposed, the first reinforcement is provided so that the upper half of the upper surface of the lift protrudes inward from the position where the overhang bar member is disposed. Buried steel,
When the overhang rail member is arranged on the upper surface of the lift, the overhang portion of the overhang rail member and the upper half of the first reinforcing steel material are connected by connection means such as welding,
6. The overhanging railing construction method according to 5 above.

.前記第1補強鋼材と前記第2補強鋼材とを溶接の如き接続手段で接続することを特徴とする上記に記載の張出部高欄部施工方法。 7 . 7. The overhang railing construction method according to claim 6 , wherein the first reinforcing steel material and the second reinforcing steel material are connected by connection means such as welding.

.前記張出高欄部材の据付固定作業用の足場として、前記堤体の直下のリフトで使用したダム用型枠を用いることを特徴とする上記5〜7のいずれかに記載の張出部高欄部施工方法。 8 . The overhang height column according to any one of 5 to 7 above, wherein a dam formwork used in a lift immediately below the bank is used as a scaffold for the installation and fixing work of the overhang height member. Construction method.

請求項1又はに示す発明によれば、ダム工事における張出部及び高欄部の設置に際しての省力化・省人化・工程及び工期の短縮化・品質の確保・安全性の確保等の各項目の達成が可能なコンクリートダムにおける張出部高欄部構造及び張出部高欄部施工方法を提供することができる。
特に、上流側に配設される張出高欄部材と下流側に配設される張出高欄部材との接合強度を高めることができると共に、上下流張出部間に打設されるコンクリートとの一体化(付着)に寄与することにより強度向上を図ることができる。
According to the invention shown in claim 1 or 5 , each of the labor saving, manpower saving, process and construction period shortening, quality ensuring, safety ensuring, etc. in the installation of the overhang part and the railing part in the dam construction The overhang part railing structure and the overhang part railing construction method in a concrete dam capable of achieving the items can be provided.
In particular, it is possible to increase the bonding strength between the overhang rail member disposed on the upstream side and the overhang rail member disposed on the downstream side, and with the concrete placed between the upstream and downstream overhang portions. Strength can be improved by contributing to integration (adhesion).

特に、張出部と高欄部とをプレキャスト化するだけでなく一体化構造とすることによって、張出部を存置型枠として使用すると共に次工程である高欄部工程を省略することができ、張出部と高欄部の施工に際して型枠・鉄筋作業が不要となる。従って、
(1)長期間のコンクリート打設停止が回避されて工程の短縮化、及び工期の短縮化を図ることができ、
(2)型枠工・鉄筋工等の専門技能工を要さず、少人数での作業が可能となり、省力化・省人化を図ることができ、
(3)長期放置の回避により、不連続なダム堤体の内部温度応力の発生が防止され、ダムコンクリートの品質を確保することができ、
(4)型枠作業時の墜落・落下物等の災害が防止されることによって工事の安全性が著しく向上し、
(5)型枠材や仮設材等の廃棄物も減少することになり環境適性にも優れる、
という著しい効果を奏する。
一例として、従来構造では施工期間が50日間規模の張出部高欄部構造の現場の場合、本発明によれば施工期間は20日間規模となり、工期を半分以下とすることが可能である。
In particular, by making the overhang part and the balustrade part not only precast but also having an integrated structure, the overhang part can be used as an in-situ formwork and the next balustrade process can be omitted. Formwork and rebar work are not required for the construction of the projecting part and railing part. Therefore,
(1) A long-term concrete placement stop can be avoided to shorten the process and the construction period.
(2) Special work such as formwork and rebar work is not required, and it is possible to work with a small number of people, saving labor and labor.
(3) By avoiding long-term neglect, the generation of internal temperature stress in discontinuous dam body can be prevented, and the quality of dam concrete can be secured.
(4) The safety of construction is significantly improved by preventing accidents such as falling and falling objects during formwork.
(5) Excellent environmental suitability due to the reduction of waste materials such as formwork and temporary materials.
There is a remarkable effect.
As an example, in the case of the site of the overhang section railing structure where the construction period is 50 days in the conventional structure, according to the present invention, the construction period is 20 days, and the construction period can be reduced to half or less.

請求項2に示す発明によれば、張出高欄部材の剪断抵抗を補強することが可能である。   According to the invention shown in claim 2, it is possible to reinforce the shear resistance of the overhang rail member.

請求項3又はに示す発明によれば、張出高欄部材と直下のリフトとの接合強度を高めることができるので、張出高欄部材の剪断抵抗をより補強することができる。 According to the invention described in claim 3 or 6 , since the joining strength between the overhang rail member and the lift directly below can be increased, the shear resistance of the overhang rail member can be further reinforced.

請求項又はに示す発明によれば、直下のリフトと上流側張出高欄部材と下流側張出高欄部材の3者の接合強度をより高めることができる。 According to the invention shown in claim 4 or 7 , it is possible to further increase the bonding strength of the three members of the lift immediately below, the upstream protruding column member, and the downstream protruding column member.

請求項に示す発明によれば、従来の張出部施工や高欄部施工において必要であったブラケット、足場、支保工を省略することができ、直下のリフトの施工まで用いていたダム用型枠を用いることにより、
(a)ダム堤体の施工が終了してからのダム用型枠を撤去、
(b)足場用ブラケットの設置、
(c)足場組立、
(d)型枠支保工組立、
の各作業を不要とすることができるので、工程・工期の短縮化が可能である。
また、張出高欄部の設置完了後においては、
(e)型枠支保工解体・撤去、
(f)足場解体・撤去、
(g)足場用ブラケットの撤去、
の各作業も当然のことながら不要となるので、更なる工程・工期の短縮化が可能である。
According to the invention shown in claim 8 , the bracket, the scaffold and the supporting work, which are necessary in the conventional overhang construction and railing construction, can be omitted, and the dam mold used up to the construction of the direct lift By using a frame,
(A) Remove the dam formwork after the construction of the dam body
(B) installation of scaffolding brackets;
(C) scaffold assembly,
(D) Form support assembly
Therefore, it is possible to shorten the process and the construction period.
In addition, after the installation of the overhang rail section is completed,
(E) Formwork support work dismantling and removal,
(F) Scaffold dismantling / removal,
(G) Removal of bracket for scaffolding,
Since each of these operations is naturally unnecessary, the process and construction period can be further shortened.

本発明に係るコンクリートダムにおける張出部高欄部構造の一実施例を示す要部概略断面図The principal part schematic sectional drawing which shows one Example of the overhang part railing part structure in the concrete dam which concerns on this invention 本発明に好ましく用いられる張出高欄部材の一実施例を示す概略正面図及び概略側面図The schematic front view and schematic side view which show one Example of the overhang rail member preferably used for this invention 本発明に係る張出部高欄部施工方法の一実施例の一工程を示す要部概略断面図Main part schematic sectional drawing which shows 1 process of one Example of the overhang part railing construction method which concerns on this invention 図3の次工程を示す要部概略断面図FIG. 3 is a schematic cross-sectional view of the main part showing the next step of FIG. 図4の次工程を示す要部概略断面図FIG. 4 is a schematic cross-sectional view of the main part showing the next step of FIG. 図5の次工程を示す要部概略断面図FIG. 5 is a schematic cross-sectional view of the main part showing the next step of FIG. 張出高欄部材と堤体の直下のリフトとの固着構成の他の実施例を示す要部概略断面図The principal part schematic sectional drawing which shows the other Example of the adhering structure of the overhang rail member and the lift directly under a bank body 張出高欄部材と堤体の直下のリフトとの固着構成の他の実施例を示す要部概略断面図The principal part schematic sectional drawing which shows the other Example of the adhering structure of the overhang rail member and the lift directly under a bank body

以下、本発明に係るコンクリートダムにおける張出部高欄部構造及び張出部高欄部施工方法について添付図面に基き詳細に説明する。   Hereinafter, the overhang part railing structure and the overhang part railing construction method in the concrete dam according to the present invention will be described in detail with reference to the accompanying drawings.

本発明は、コンクリートダム堤頂部の非越流部を上下流両外側に張出すための構造である張出部と、該張出部の各々の上に配設されることにより堤頂部に敷設される道路部を確保すると共に安全柵として機能する高欄部とを、プレキャストコンクリート化すると共に一体化構造とする技術である。   The present invention relates to a projecting portion that is a structure for projecting a non-overflow portion of a concrete dam ridge top portion to both the upstream and downstream sides, and laying on the ridge top portion by being disposed on each of the overhang portions. This is a technology that secures the road portion to be used and makes the balustrade portion that functions as a safety fence into precast concrete and has an integrated structure.

即ち、図1及び図2に示すように、本発明はコンクリートダム堤頂部の上下流部における張出部及び高欄部の構造において、
前記張出部11と該張出部11の上部に配設される高欄部12とが、一体化構造を有するプレキャストコンクリートで形成された張出高欄部材1から成る構成である。
That is, as shown in FIG.1 and FIG.2, this invention is in the structure of the overhang | projection part and balustrade part in the upstream and downstream part of a concrete dam crest part,
The overhanging portion 11 and the balustrade portion 12 provided on the upper portion of the overhanging portion 11 are composed of an overhanging balustrade member 1 formed of precast concrete having an integrated structure.

張出高欄部材1は、予め工場等において所望の形状・サイズ・要求強度にプレキャストコンクリート成形された後に現場に搬入されるものであり、この種のプレキャストコンクリート製の構造材として公知公用の構成を特別の制限なく採ることができる。   The overhang rail member 1 is precast concrete molded into a desired shape, size, and required strength in a factory in advance and then carried to the site. As a structural material made of this type of precast concrete, a publicly known configuration is used. It can be taken without any special restrictions.

該張出高欄部材1の大きさとしては、適用されるコンクリートダムの設計条件によって適宜サイズが設定されるが、1基あたり厚みが概ね350mm程度、張出量が概ね350mm程度、高さが概ね2300mm程度、長さが概ね2500mm程度、重さが概ね5トン程度を一例として挙げることができる。また、張出部11の張出量や高さ・厚み、高欄部12の高さ・厚みについても適用されるコンクリートダムの設計条件等によって所望のサイズが適宜設定される。   The size of the overhang column member 1 is appropriately set according to the design conditions of the concrete dam to be applied, but the thickness per unit is about 350 mm, the overhang amount is about 350 mm, and the height is about An example is about 2300 mm, a length of about 2500 mm, and a weight of about 5 tons. In addition, the desired size is appropriately set depending on the design conditions of the concrete dam to be applied to the overhang amount and height / thickness of the overhang portion 11 and the height / thickness of the balustrade portion 12.

前記張出高欄部材1は、該張出高欄部材1が配設される堤体の直下のリフト2に固着される固着構成によって固定される構成であり、
好ましい固着構成としては、
前記張出高欄部材1が配設される堤体の直下のリフト2に、該リフト2上面であって前記張出高欄部材1の配設位置より内側部分に上半部が突出するように第1補強鋼材3が埋設されており、
前記リフト2上面に配設した前記張出高欄部材1の張出部11が前記第1補強鋼材3の上半部に溶接の如き接続手段4で接続されることにより固着される構成であること、である。
The overhang rail member 1 is a structure fixed by an adhering structure that is fixed to a lift 2 directly below a bank body in which the overhang rail member 1 is disposed,
As a preferable fixing configuration,
The lift 2 immediately below the bank body on which the overhang bar member 1 is disposed is arranged so that the upper half projects from the upper surface of the lift 2 to the inner side of the position where the overhang bar member 1 is disposed. 1 Reinforced steel 3 is embedded,
The overhanging section 11 of the overhanging column member 1 disposed on the upper surface of the lift 2 is fixed by being connected to the upper half of the first reinforcing steel material 3 by connecting means 4 such as welding. .

第1補強鋼材3は、前記した直下のリフト2が打設される際に上半部が突出した状態で該リフト8に下半部が埋設されることにより設置されるものであり、この種のコンクリート構築物の補強鋼材として公知公用の鋼材を特別の制限なく用いることができ、例えば、H−100×100、長さ650mmのH型鋼を適宜間隔で複数本(1基の張出高欄部材1あたり4〜6本程度)を並べて埋設設置する構成を採ることができる。   The first reinforcing steel material 3 is installed by burying the lower half part in the lift 8 in a state where the upper half part protrudes when the above-described lift 2 is placed. A publicly known steel material can be used as the reinforcing steel material for the concrete structure of the present invention without any particular limitation. For example, a plurality of H-shaped steels having a length of H-100 × 100 and a length of 650 mm (one overhang rail member 1) It is possible to adopt a configuration in which about 4 to 6 pieces are arranged side by side.

張出高欄部材1と第1補強鋼材3との接続を行う接続手段4としては、張出高欄部材1の張出部11の内側面に配設したインサート13にアンカー部材を挿通固定し、このアンカー部材を第1補強鋼材3に溶接接続する等の方法を挙げることができる。   As the connecting means 4 for connecting the overhang bar member 1 and the first reinforcing steel member 3, an anchor member is inserted and fixed to an insert 13 disposed on the inner surface of the overhang part 11 of the overhang bar member 1, A method of welding the anchor member to the first reinforcing steel material 3 can be exemplified.

直下のリフト2に埋設された第1補強部材3に張出高欄部材1の張出部11を固着して接続することによって該張出高欄部材1と直下のリフト2との接合強度を高めることができるので、張出高欄部材1の剪断抵抗をより補強することができる。   The bonding strength between the overhanging column member 1 and the directly below lift 2 is increased by fixing and connecting the overhanging portion 11 of the overhanging column member 1 to the first reinforcing member 3 embedded in the directly below lift 2. Therefore, the shear resistance of the overhang rail member 1 can be further reinforced.

また本実施例では、前記リフト2上面の上流側に配設した前記張出高欄部材1の張出部11と下流側に配設した前記張出高欄部材1の張出部11とを、該2つの張出部11・11間に架け渡し状態で配設される第2補強鋼材によって接続する構成を採ることにより、上流側に配設される張出高欄部材1と下流側に配設される張出高欄部材1との接合強度を高めることができると共に、上下流張出部11・11間に打設されるコンクリート6との一体化(付着)に寄与することにより強度向上を図ることができる。 Further, in this embodiment, the overhanging portion 11 of the overhanging column member 1 disposed on the upstream side of the upper surface of the lift 2 and the overhanging portion 11 of the overhanging column member 1 disposed on the downstream side are By adopting a configuration in which the two reinforcing steel members 5 arranged between the two overhanging portions 11 and 11 are connected in a bridging state, the overhanging column member 1 arranged on the upstream side and the downstream side are arranged on the downstream side. The joint strength with the overhanging column member 1 can be increased, and the strength is improved by contributing to the integration (attachment) with the concrete 6 placed between the upstream and downstream overhanging portions 11 and 11. be able to.

張り出し高欄部材1への第2補強鋼材5の接続は該張出高欄部材1の張出部11の内側面上部に配設したインサート14にアンカー部材を挿通固定し、このアンカー部材を第2補強鋼材5に溶接接続する等の方法を挙げることができる。   The second reinforcing steel member 5 is connected to the overhang rail member 1 by inserting and fixing an anchor member to an insert 14 disposed on the upper inner surface of the overhang portion 11 of the overhang rail member 1. The method of welding-connecting to the steel material 5 can be mentioned.

更に本実施例では、前記第1補強鋼材3と前記第2補強鋼材5とを溶接の如き接続手段で接続する構成を採ることにより、直下のリフト2と上流側の張出高欄部材1と下流側の張出高欄部材1の3者の接合強度をより高めることができる。   Further, in this embodiment, the first reinforcing steel member 3 and the second reinforcing steel member 5 are connected by connecting means such as welding, so that the lift 2 directly below, the overhanging column member 1 on the upstream side and the downstream side are connected. The joint strength of the three members of the overhanging column member 1 on the side can be further increased.

次に、上記構成を有する張出部高欄部構造の施工方法の一実施例について図3〜図6に基づき説明する。   Next, an embodiment of a construction method for the overhanging rail section structure having the above-described configuration will be described with reference to FIGS.

コンクリートダム堤体の施工が進み、本発明の張出高欄部材1が据付固定される部分である直下のリフト2(即ち、堤体の最上部のリフトである。)の施工時に、図3に示すように、該直下のリフト2へのコンクリート打設に際して、該リフト2の上面であって前記張出高欄部材1の配設位置より内側部分に上半部が突出するように第1補強鋼材3を埋設した状態とする。   When the construction of the concrete dam body progresses and the construction of the lift 2 directly below (that is, the uppermost lift of the dam body), which is the part where the overhang rail member 1 of the present invention is installed and fixed, is shown in FIG. As shown in the drawing, when placing concrete on the lift 2 directly below, the first reinforcing steel material is such that the upper half of the upper surface of the lift 2 protrudes to the inner side from the position where the overhanging column member 1 is disposed. 3 is buried.

直下のリフト2の施工が完了した後、図4に示すように、ケーブルクレーン8によって張出高欄部材1を現場施工位置に吊下搬入し、直下のリフト2の上面に据え付ける。据え付けた張出高欄部材1を接続手段4によって第1補強鋼材3と接続固定する。更に、リフト上面の上流側に配設した張出高欄部材1と、下流側に配設した張出高欄部1とを、該2つの張出高欄部材1・1の各々の張出部11・11間に架け渡し状態で配設する第2補強鋼材5によって接続する。さらにまた、第1補強鋼材3・3と第2補強鋼材5とを接続する。尚、この張出高欄部材1の据付固定作業を行うに際しては、コンクリートダム堤体の施工に際して使用していたダム用型枠7・7を解体することなく利用することにより安全な作業環境を効率よく確保することができる。 After the construction of the direct lift 2 is completed, as shown in FIG. 4, the overhang rail member 1 is suspended and carried to the site construction position by the cable crane 8 and installed on the upper surface of the direct lift 2. The installed overhang rail member 1 is connected and fixed to the first reinforcing steel member 3 by the connecting means 4. Furthermore, the overhang height column member 1 disposed on the upstream side of the upper surface of the lift 2 and the overhang height column portion 1 disposed on the downstream side are respectively connected to the overhang portions 11 of the two overhang height column members 1. -It connects by the 2nd reinforcement steel material 5 arrange | positioned between 11 in a bridging state. Furthermore, the 1st reinforcement steel materials 3 * 3 and the 2nd reinforcement steel materials 5 are connected. In addition, when performing the installation and fixing work of the overhang rail member 1, a safe working environment can be efficiently achieved by using the dam formwork 7, 7 used for the construction of the concrete dam body without dismantling. Can be secured well.

次に図5に示すように、コンクリート打設機9によって、リフト2上面であって張出高欄部材1・1の高欄部12・12の下方位置までコンクリートを打設する。   Next, as shown in FIG. 5, the concrete is placed by the concrete placement machine 9 up to the upper surface of the lift 2 and below the height sections 12, 12 of the overhanging sections 1, 1.

打設コンクリート6の養生確認後、図6に示すようにダム用型枠7・7を解体撤去することにより、コンクリートダムにおける張出部高欄部の施工が完了する。   After confirming the curing of the cast concrete 6, the construction of the overhanging section of the concrete dam is completed by dismantling and removing the dam molds 7, 7 as shown in FIG.

以上、本発明に係るコンクリートダムにおける張出部高欄部構造及び張出部高欄部施工方法について実施例に基き説明したが、本発明は上記実施例に限定されず、本発明の範囲内において他の態様を採ることもできる。   As mentioned above, although the overhang part balustrade structure and the overhang part balustrade construction method in the concrete dam concerning this invention were demonstrated based on the Example, this invention is not limited to the said Example, Other within the scope of the present invention. It is also possible to adopt the embodiment.

例えば、上記実施例では、張出高欄部材1は、張出部11と高欄部12とを同じ厚みで形成した構成としているが、本発明はかかる構成に限定されず、張出部11より高欄部12を厚く形成してもよいし、或いは薄く形成してもよい。   For example, in the said Example, although the overhang rail member 1 is set as the structure which formed the overhang part 11 and the balustrade part 12 with the same thickness, this invention is not limited to this structure, but is higher than the overhang part 11. The portion 12 may be formed thick or thin.

また、図7に示すように、直下のリフト2に凹部21を設け、該凹部21に嵌合する凸部15を張出高欄部材1の下面に形成した構成とすることもできる。尚、本態様によれば、直下のリフト2上面への張出高欄部材1の据付固定が容易となる。尚また、本態様の場合であっても、前記した実施例の第1補強鋼材3及び第2補強鋼材5と併用することが好ましい。   Further, as shown in FIG. 7, it is possible to provide a structure in which a recess 21 is provided in the lift 2 directly below, and a protrusion 15 that fits into the recess 21 is formed on the lower surface of the overhanging column member 1. In addition, according to this aspect, it becomes easy to install and fix the overhang rail member 1 to the upper surface of the lift 2 immediately below. Even in the case of this embodiment, it is preferable to use the first reinforcing steel material 3 and the second reinforcing steel material 5 of the above-described embodiment together.

更に、図8に示すように、張出高欄部材1の配設位置に接合用鉄筋22を上半部が直下のリフト2上面に突出するように埋設すると共に、張出高欄部材1の底面から内部にかけて前記接合用鉄筋22が挿通される挿通孔16を形成した構成とすることもできる。かかる構成によれば、張出高欄部材1を直下のリフト2に接合用鉄筋22を底面から挿通した状態で据付固定することができる。尚、本態様の場合であっても、前記した実施例の第1補強鋼材3及び第2補強鋼材5と併用することが好ましい。   Furthermore, as shown in FIG. 8, the reinforcing bar 22 is embedded at the position where the overhanging column member 1 is disposed so that the upper half protrudes from the upper surface of the lift 2 directly below, and from the bottom surface of the overhanging column member 1. It can also be set as the structure which formed the penetration hole 16 in which the said reinforcing bar 22 for insertion is penetrated inside. According to such a configuration, the overhang rail member 1 can be installed and fixed in a state where the joining rebar 22 is inserted from the bottom surface to the lift 2 directly below. Even in the case of this aspect, it is preferable to use together with the first reinforcing steel material 3 and the second reinforcing steel material 5 of the above-described embodiment.

1 張出高欄部材
11 張出部
12 高欄部
13 インサート
14 インサート
15 凸部
16 挿通孔
2 直下のリフト
21 凹部
22 接合用鉄筋
3 第1補強鋼材
4 接続手段
5 第2補強鋼材
6 打設コンクリート
7 ダム用型枠
8 ケーブルクレーン
9 コンクリート打設機
DESCRIPTION OF SYMBOLS 1 Overhang rail member 11 Overhang part 12 High rail part 13 Insert 14 Insert 15 Protrusion part 16 Insertion hole 2 Lift just below 21 Recess part 22 Joining rebar 3 1st reinforcement steel material 4 Connection means 5 2nd reinforcement steel material 6 Casting concrete 7 Form for dam 8 Cable crane 9 Concrete placement machine

Claims (8)

コンクリートダム堤頂部の上下流部における張出部及び高欄部の構造において、
前記張出部と該張出部の上部に配設される高欄部とが、一体化構造を有するプレキャストコンクリートで形成された張出高欄部材から成る構成であり、
上流側に配設した前記張出高欄部材の張出部と下流側に配設した前記張出高欄部材の張出部とが、該2つの張出部間に架け渡し状態で配設される第2補強鋼材によって接続される構成であること、
特徴とするコンクリートダムにおける張出部高欄部構造。
In the structure of the overhanging part and the balustrade part in the upstream and downstream part of the concrete dam crest,
The overhang portion and the balustrade portion disposed on the upper portion of the overhang portion are composed of an overhang balustrade member formed of precast concrete having an integrated structure ,
An overhang portion of the overhang rail member disposed on the upstream side and an overhang portion of the overhang rail member disposed on the downstream side are disposed in a stretched state between the two overhang portions. Being connected by the second reinforcing steel material,
Overhanging portion railing section structure in the concrete dam, wherein.
前記張出高欄部材が、この部材が配設される堤体の直下のリフトに固着される固着構成によって固定される構成であることを特徴とする請求項1に記載のコンクリートダムにおける張出部高欄部構造。 2. The overhang portion in a concrete dam according to claim 1, wherein the overhang rail member is fixed by a fixing structure that is fixed to a lift directly below a bank body in which the member is disposed. The balustrade structure. 前記固着構成が、
前記張出高欄部材が配設される堤体の直下のリフトに、該リフト上面であって前記張出高欄部材の配設位置より内側部分に上半部が突出するように第1補強鋼材が埋設されており、
前記リフト上面に配設した前記張出高欄部材の張出部が前記第1補強鋼材の上半部に溶接の如き接続手段で接続されることにより固着される構成であること、
を特徴とする請求項2に記載のコンクリートダムにおける張出部高欄部構造。
The anchoring configuration is
The first reinforcing steel material is provided on the lift directly below the bank body on which the overhang bar member is disposed so that the upper half projects from the upper surface of the lift and on the inner side of the position where the overhang bar member is disposed. Buried,
The projecting portion of the projecting rail member disposed on the upper surface of the lift is configured to be fixed by being connected to the upper half of the first reinforcing steel material by connection means such as welding,
The overhanging railing structure in a concrete dam according to claim 2.
前記第1補強鋼材と前記第2補強鋼材とが、溶接の如き接続手段で接続される構成であることを特徴とする請求項に記載のコンクリートダムにおける張出部高欄部構造。 4. The overhanging column structure in a concrete dam according to claim 3 , wherein the first reinforcing steel material and the second reinforcing steel material are connected by connection means such as welding. コンクリートダム堤頂部の上下流部における張出部及び高欄部の施工方法において、
前記張出部と該張出部の上部に配設される高欄部とを一体化構造のプレキャストコンクリート製によって予め形成しておき、
この一体化構造のプレキャストコンクリート製の張出部高欄部である張出高欄部材を、該張出高欄部材が配設される直下のリフト上面に据付固定し、
上流側に配設した前記張出高欄部材と下流側に配設した前記張出高欄部材とを、該2つの張出高欄部材の各々の張出部間に架け渡し状態で配設した第2補強鋼材によって接続した後、前記リフト上面であって前記高欄部の下方位置までコンクリートを打設すること、
を特徴とする張出部高欄部施工方法。
In the construction method of the overhanging part and the railing part in the upstream and downstream part of the concrete dam crest part,
The overhang portion and the balustrade portion disposed on the upper portion of the overhang portion are previously formed by precast concrete made of an integrated structure,
The overhang rail member which is the overhang height rail made of precast concrete of this integrated structure is installed and fixed on the upper surface of the lift directly below the overhang rail member ,
The second overhang rail member arranged on the upstream side and the overhang rail member arranged on the downstream side are arranged in a stretched state between the respective overhang portions of the two overhang column members. After connecting with a reinforcing steel material, placing concrete up to the lower position of the balustrade on the upper surface of the lift,
The overhang part railing construction method characterized by this.
前記張出高欄部材が配設される堤体の直下のリフト打設時に、該リフト上面であって前記張出高欄部材の配設位置より内側部分に上半部が突出するように第1補強鋼材を埋設し、
前記リフト上面に前記張出高欄部材を配設した際に、該張出高欄部材の張出部と前記第1補強鋼材の上半部とを溶接の如き接続手段で接続すること、
を特徴とする請求項に記載の張出部高欄部施工方法。
When the lift is placed directly below the bank body on which the overhang bar member is disposed, the first reinforcement is provided so that the upper half of the upper surface of the lift protrudes inward from the position where the overhang bar member is disposed. Buried steel,
When the overhang rail member is arranged on the upper surface of the lift, the overhang portion of the overhang rail member and the upper half of the first reinforcing steel material are connected by connection means such as welding,
The overhang part railing construction method of Claim 5 characterized by these.
前記第1補強鋼材と前記第2補強鋼材とを溶接の如き接続手段で接続することを特徴とする請求項に記載の張出部高欄部施工方法。 7. The overhang railing construction method according to claim 6 , wherein the first reinforcing steel material and the second reinforcing steel material are connected by connection means such as welding. 前記張出高欄部材の据付固定作業用の足場として、前記堤体の直下のリフトで使用したダム用型枠を用いることを特徴とする請求項5〜7のいずれかに記載の張出部高欄部施工方法。 The overhang height bar according to any one of claims 5 to 7 , wherein a formwork for a dam used in a lift immediately below the bank body is used as a scaffold for installation and fixing work of the overhang height column member. Part construction method.
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