JP3952843B2 - Construction method of tower structure - Google Patents

Construction method of tower structure Download PDF

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Publication number
JP3952843B2
JP3952843B2 JP2002139853A JP2002139853A JP3952843B2 JP 3952843 B2 JP3952843 B2 JP 3952843B2 JP 2002139853 A JP2002139853 A JP 2002139853A JP 2002139853 A JP2002139853 A JP 2002139853A JP 3952843 B2 JP3952843 B2 JP 3952843B2
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Japan
Prior art keywords
tower
climbing
construction method
push
gantry
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JP2003328323A (en
Inventor
淳 高橋
大輔 石松
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Kajima Corp
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Kajima Corp
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Description

【０００１】
【発明の属する技術分野】
本発明は、斜張橋の主塔などの逆Ｙ字型の塔状構造物の施工方法に関するものである。
【０００２】
【従来の技術】
斜張橋の逆Ｙ字型の主塔を施工する場合、従来は、図６に示すように、主として所謂クライミングフォーム５０とタワークレーン５１を使用していた。逆Ｙ字型の主塔１は、主桁を挟んで左右一対の主塔基部２，２と、この主塔基部２，２から互いに接近するように傾斜して立設される２本の柱部３ａ，３ａからなる主塔中央部３と、２本の柱部３ａ，３ａが合体する主塔結合部４と、この主塔結合部４から上方に突出する主塔頂部５等から構成され、次に示す手順で施工されていた。
【０００３】
(1) 主塔基部２を地上のクレーンと総足場工法で施工する。
(2) クライミングフォーム５０とタワークレーン５１を組立て、クライミングフォーム５０をクライミング装置により順次上昇させ、柱部３ａの各ロットを順次施工していく。タワークレーン５１は、クライミング装置（センターホールジャッキや高強度ねじ鉄筋など）を取付けるための先行埋め込み鉄骨や主筋などを搬入するためのものであり、柱部３ａの伸長に伴い、下部に単位マストを順次継ぎ足して伸長させる。このマスト部分５１ａは、既設の柱部３ａにステー（壁繋ぎ）５２で支持させる。また、既設の柱部３ａ，３ａを水平のストラット５３で繋いでいる。
(3) 主塔中央部３の施工が完了すると、クライミングフォーム５０を解体し、ブラケット５４を中央部３の上部に取付け、総足場工法で主塔結合部４を施工し、続いて総足場工法で主塔頂部５の各ロットを順次施工していく。
【０００４】
【発明が解決しようとする課題】
しかし、前述のような従来の施工方法では、タワークレーンを主塔に沿って伸長させていくため、ステーが上方にいくに従って長大なものとなり、主塔構築に伴う設備費が増大するなどの問題点があった。
【０００５】
本発明は、このような問題点を解消すべくなされたもので、その目的は、逆Ｙ字型の塔状構造物の施工に際し、塔の中間部でタワークレーンのステーを無くすことができ、塔構築に伴う設備費の低減を図れる塔状構造物の施工方法を提供することにある。
【０００６】
【課題を解決するための手段】
本発明の請求項１は、基部から２本の柱部が互いに接近するように傾斜して立設され、この２本の柱部の結合部から頂部が突設されている塔状構造物の施工方法であり、２本の柱部の型枠を備え２本の柱部に掛け渡されるクライミング構台の両端部にタワークレーンをマストを継ぎ足していない最小の状態で設置し、このタワークレーンによる資材の搬入とクライミング構台による型枠の上昇を順次繰り返して２本の柱部を施工し、２本の柱部の合体後は、タワークレーンにマストを継ぎ足しながら、総足場工法あるいは型枠により頂部を施工することを特徴とする塔状構造物の施工方法である。
【０００７】
本発明の請求項２は、請求項１に記載の施工方法において、クライミング構台の両端部における下面には既設の塔体に反力をとってクライミング構台を押し上げる押し上げ式クライミング装置が設けられ、このクライミング構台の上に型枠と足場が横移動可能に設けられていることを特徴とする塔状構造物の施工方法である。
【０００８】
本発明は、例えば斜張橋の逆Ｙ字型の主塔の施工に有効に適用されるものである。クライミング構台は、上に向かって狭まる２本の柱部の最大幅すなわち基部を取り囲むことのできる大きさで平面視で長方形のトラス桁などから構成され、クライミング装置を介して２本の柱部に取付けられ、クライミング装置により上昇する。
【０００９】
クライミング装置は、例えば押し上げビーム等の押し上げ部材と押し上げジャッキ等の押し上げ装置などからなる押し上げ式クライミング装置であり、既設の２本の柱部等の塔体に反力をとってクライミング構台を押し上げる。また、２本の柱部の傾斜に対応できるように、押し上げ部材が横押しジャッキ等の横押し装置を介して塔幅方向に横移動可能にクライミング構台の下面に接続されている。型枠と足場は、例えばクライミング構台の上面を塔幅方向に移動可能な台車などに載置され、横押しジャッキ等の横押し装置により横移動し、２本の柱部の傾斜に対応できるようにされている。
【００１０】
基部を総足場工法で施工した後、クライミング構台を基部の上に組み付け、クライミング構台の両端部のマストを継ぎ足していない最小状態のタワークレーンで資材の搬入を行い、コンクリートの打設を行い、１ロットの施工が完了するとクライミング構台を１ロット分上昇させ、以上の工程を順次繰り返すことにより、２本の柱部を施工する。
【００１１】
柱部の結合部の手前で２本の柱部の施工が終了すると、総足場工法で結合部を施工し、続いてクライミング構台の両端部のクレーンを単位マストを継ぎ足すことで上方に伸長させつつ総足場工法で頂部を施工する。この総足場工法では、クライミング構台を撤去し、代わりにブラケットをタワークレーンのベースとしてもよい。さらに、総足場工法に限らず、クライミング構台と型枠をそのまま利用して結合部および頂部の施工を行うこともできる。
【００１２】
本発明の施工方法によれば、逆Ｙ字型の塔状構造物の施工に際し、塔の中間部の施工ではクライミング構台にタワークレーンを最小状態で載せてクライミングフォーム工法を実施するため、タワークレーンのステーを無くすことができ、塔上部に総足場工法を用いた場合には、塔の頂部の施工においてステーの長さを短くすることができ、主塔構築に伴う設備費の低減を図れる。また、押し上げビーム等の押し上げ部材と押し上げジャッキ等の押し上げ装置などからなる押し上げ式クライミング装置をクライミング構台の下面に設け、上部に型枠と足場を横移動可能に設けているため、スライド作業を容易かつ迅速に行うことができる。
【００１３】
【発明の実施の形態】
以下、本発明を図示する一実施形態に基づいて説明する。この実施形態は、斜張橋の逆Ｙ字型の主塔に適用した例である。図１、図２、図３は、本発明の施工方法の主塔中間部の開始状態を示す正面図、平面図、側面図である。図４は、主塔中間部の開始状態から終了状態までを示す正面図である。図５は、主塔結合部から主塔頂部までの施工状態を示す正面図である。
【００１４】
図１に示すように、逆Ｙ字型の主塔１は、主桁を挟んで左右一対の主塔基部２，２と、この主塔基部２，２から互いに接近するように傾斜して立設される２本の柱部３ａ，３ａからなる主塔中央部３と、２本の柱部３ａ，３ａが合体する主塔結合部４と、この主塔結合部４から上方に突出する主塔頂部５から構成され、本発明では、概略、クライミング構台１０とその両端部のタワークレーン１１を使用して２本の柱部３ａ，３ａを施工し（クライミングフォーム施工範囲Ａ：図１，図４参照）、２本の柱部の合体後は、タワークレーン１１を伸長させて主塔頂部５を施工する（上部施工範囲：図５参照）。
【００１５】
図１〜図３に示すように、クライミング構台１０は、左右一対の主塔基部２，２を取り囲むことができる大きさの平面視で長方形のトラス桁１２と、押し上げ式クライミング装置１３などからなる。押し上げ式クライミング装置１３は、例えば押し上げビーム１３ａと押し上げジャッキ１３ｂなどからなり、既設の主塔基部や柱部の外側面に反力をとってトラス桁１２を上昇させる。なお、押し上げビーム１３ａと押し上げジャッキ１３ｂは横押しジャッキ等で主塔幅方向に横移動可能にトラス桁１２の下面に取付けられており、柱部３ａの傾斜に対応できるようにされている。
【００１６】
トラス桁１２の両端部における上面には、型枠２０と足場２１が設置され、クライミング構台１０と共に型枠２０が１ロット分順次上昇し、２本の柱部３ａ，３ａが１ロット分順次施工される。これら型枠２０と足場２１は、例えば台車に載せられ、横押しジャッキ等により主塔幅方向に横移動可能とされ、柱部３ａの傾斜に対応できるようにされている。
【００１７】
タワークレーン１１は、トラス桁１２の両端部における型枠２０・足場２１の外側に設置され、型枠２０に先行する鉄筋などの資材の搬入を行う。このタワークレーン１１は、マストを継ぎ足していない最小の状態で据え付け、図４に示すように、クライミング構台１０と共に上昇し、クレーン作業を行う。また、タワークレーン１１は、傾斜する柱部３ａに対応させて主塔側に移動させて固定する。
【００１８】
図５に示すように、クライミング構台１０が主塔結合部４の手前まで上昇すると、トラス桁１２上に足場を組み、総足場工法で主塔結合部４を施工する。続いて、タワークレーン１１の下部に単位マストを継ぎ足し、マスト１１ａを上方に伸長させながら足場を組上げ、総足場工法で主塔頂部５を施工する。
【００１９】
なお、この主塔結合部４と主塔頂部５の施工では、クライミング構台１０を撤去し、代わりにブラケット（図示省略）を柱部の上部外面に設置し、タワークレーン１１のベースとすることもできる。
【００２０】
また、クライミング構台１０と型枠２０と足場２１をそのまま利用し、主塔結合部４と主塔頂部５を施工することも可能である。
【００２１】
なお、以上は斜張橋の逆Ｙ字型の主塔の施工に適用した場合を例示したが、これに限らず、その他の逆Ｙ字型の塔状構造物の施工にも本発明を適用できる。
【００２２】
【発明の効果】
(1) 本発明の施工方法によれば、逆Ｙ字型の塔状構造物の施工に際し、塔の中間部の施工ではクライミング構台にタワークレーンを最小状態で載せてクライミングフォーム工法を実施するため、タワークレーンのステーを無くすことができ、塔上部に総足場工法を用いた場合には、塔の頂部の施工においてステーの長さを短くすることができ、主塔構築に伴う設備費の低減を図れる。
(2) 押し上げビーム等の押し上げ部材と押し上げジャッキ等の押し上げ装置などからなる押し上げ式クライミング装置をクライミング構台の下面に設け、上部に型枠と足場を横移動可能に設けることにより、スライド作業を容易かつ迅速に行うことができ、施工時間の短縮と施工コストの低減を図れる。
【図面の簡単な説明】
【図１】本発明の施工方法の主塔中間部の開始状態を示す正面図である。
【図２】図１の平面図である。
【図３】図１の側面図である。
【図４】本発明の施工方法の主塔中間部の開始状態から終了状態までを示す正面図である。
【図５】本発明の施工方法の主塔結合部から主塔頂部までの施工状態を示す正面図である。
【図６】従来の斜張橋の逆Ｙ字型の主塔を施工する方法を示す正面図である。
【符号の説明】
１……逆Ｙ字型の主塔
２……主塔基部
３……主塔中央部
３ａ…柱部
４……主塔結合部
５……主塔頂部
１０……クライミング構台
１１……タワークレーン
１２……トラス桁
１３……押し上げ式クライミング装置
１３ａ…押し上げビーム
１３ｂ…押し上げジャッキ
２０……型枠
２１……足場[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for constructing an inverted Y-shaped tower structure such as a main tower of a cable-stayed bridge.
[0002]
[Prior art]
When constructing an inverted Y-shaped main tower of a cable-stayed bridge, conventionally, a so-called climbing form 50 and a tower crane 51 have been mainly used as shown in FIG. The inverted Y-shaped main tower 1 has a pair of left and right main tower bases 2 and 2 across the main girder, and two pillars that stand upright so as to approach each other from the main tower bases 2 and 2 The main tower central part 3 composed of the parts 3a and 3a, the main tower coupling part 4 where the two column parts 3a and 3a are combined, the main tower top part 5 projecting upward from the main tower coupling part 4 and the like. It was constructed according to the following procedure.
[0003]
(1) The main tower base 2 will be constructed with a ground crane and a total scaffold construction method.
(2) The climbing form 50 and the tower crane 51 are assembled, the climbing form 50 is sequentially raised by the climbing device, and each lot of the pillar portion 3a is sequentially constructed. The tower crane 51 is for carrying in a pre-embedded steel frame or main bar for attaching a climbing device (center hole jack, high-strength screw rebar, etc.). Sequentially add and extend. The mast portion 51a is supported by a stay (wall connection) 52 on the existing column portion 3a. Further, the existing pillar portions 3 a and 3 a are connected by a horizontal strut 53.
(3) When the construction of the central part 3 of the main tower is completed, the climbing form 50 is dismantled, the bracket 54 is attached to the upper part of the central part 3, and the main tower connection part 4 is constructed by the total scaffold method, followed by the total scaffold method. Then, each lot of the main tower top 5 is constructed in sequence.
[0004]
[Problems to be solved by the invention]
However, in the conventional construction method as described above, the tower crane is extended along the main tower, so that the stay becomes longer as the stay moves upward, and the cost of equipment accompanying the construction of the main tower increases. There was a point.
[0005]
The present invention has been made to solve such problems, and the purpose thereof is to eliminate the stay of the tower crane in the middle of the tower when constructing the inverted Y-shaped tower structure, An object of the present invention is to provide a method for constructing a tower-like structure capable of reducing the equipment cost associated with tower construction.
[0006]
[Means for Solving the Problems]
Claim 1 of the present invention is a tower-like structure in which the two column portions are inclined and arranged so as to approach each other from the base portion, and the top portion protrudes from the joint portion of the two column portions. This is a construction method, and a tower crane is installed at the both ends of the climbing gantry that has a formwork of two pillars and is stretched over the two pillars in a minimum state where no mast is added. The construction of the two pillars is carried out sequentially by carrying in and the climbing of the climbing gantry, and after the two pillars are joined, the mast is added to the tower crane and the top part is attached by the total scaffolding method or the formwork. It is the construction method of the tower-like structure characterized by constructing.
[0007]
According to claim 2 of the present invention, in the construction method according to claim 1, a push-up type climbing device is provided on the lower surfaces of both ends of the climbing gantry to push up the climbing gantry by taking a reaction force against the existing tower body. A tower-like structure construction method characterized in that a formwork and a scaffold are provided on a climbing gantry so as to be laterally movable.
[0008]
The present invention is effectively applied to the construction of an inverted Y-shaped main tower of a cable-stayed bridge, for example. The climbing gantry consists of a truss girder that is rectangular in plan view with a maximum width of two pillars that narrows upward, that is, a size that can surround the base, and is connected to the two pillars via a climbing device. Mounted and raised by climbing device.
[0009]
The climbing device is a push-up type climbing device including a push-up member such as a push-up beam and a push-up device such as a push-up jack. The climbing device pushes up the climbing gantry by taking a reaction force on the existing towers such as two pillars. Further, the push-up member is connected to the lower surface of the climbing gantry so as to be laterally movable in the tower width direction via a lateral pushing device such as a lateral pushing jack so as to correspond to the inclination of the two column portions. The formwork and scaffolding are placed on a carriage that can move in the tower width direction, for example, on the upper surface of the climbing gantry, and can be moved laterally by a lateral pushing device such as a lateral pushing jack to cope with the inclination of the two pillars. Has been.
[0010]
After constructing the base with the total scaffold construction method, assemble the climbing gantry on the base, carry in the material with the tower crane in the minimum state where the masts at both ends of the climbing gantry are not added, place the concrete, 1 When the construction of the lot is completed, the climbing gantry is raised by one lot, and the two steps are constructed by sequentially repeating the above steps.
[0011]
When the construction of the two pillars is completed before the joint part of the pillar part, the joint part is constructed by the total scaffold construction method, and then the cranes at both ends of the climbing gantry are extended upward by adding unit masts. While constructing the top with the total scaffold construction method. In this total scaffold construction method, the climbing gantry may be removed, and the bracket may be used as the base of the tower crane instead. Further, not only the total scaffold construction method, but also the construction of the connecting portion and the top portion can be performed using the climbing gantry and the formwork as they are.
[0012]
According to the construction method of the present invention, when the inverted Y-shaped tower structure is constructed, the tower crane is mounted on the climbing gantry in the minimum state in the construction of the intermediate portion of the tower. When the total scaffolding method is used for the upper part of the tower, the length of the stay can be shortened in the construction of the top of the tower, and the equipment cost associated with the construction of the main tower can be reduced. In addition, a push-up type climbing device consisting of a push-up member such as a push-up beam and a push-up device such as a push-up jack is provided on the lower surface of the climbing gantry, and the formwork and scaffolding are provided on the upper part so that it can be moved laterally. And can be done quickly.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on an embodiment shown in the drawings. This embodiment is an example applied to an inverted Y-shaped main tower of a cable-stayed bridge. 1, 2, and 3 are a front view, a plan view, and a side view showing a starting state of a middle portion of the main tower of the construction method of the present invention. FIG. 4 is a front view showing from the start state to the end state of the middle part of the main tower. FIG. 5 is a front view showing a construction state from the main tower coupling part to the main tower top part.
[0014]
As shown in FIG. 1, the inverted Y-shaped main tower 1 has a pair of left and right main tower bases 2 and 2 sandwiching the main girder and is inclined so as to approach each other from the main tower base parts 2 and 2. A main tower central portion 3 composed of two pillar portions 3a, 3a provided, a main tower coupling portion 4 where the two pillar portions 3a, 3a are united, and a main projecting upward from the main tower coupling portion 4 Consists of a tower top 5, and in the present invention, two pillars 3a and 3a are constructed using a climbing gantry 10 and tower cranes 11 at both ends thereof (climbing foam construction range A: FIG. 1 and FIG. 1). 4) After joining the two pillars, the tower crane 11 is extended to construct the main tower top 5 (upper construction range: see FIG. 5).
[0015]
As shown in FIGS. 1 to 3, the climbing gantry 10 includes a rectangular truss girder 12 and a push-up type climbing device 13 in a plan view having a size capable of surrounding a pair of left and right main tower bases 2 and 2. . The push-up climbing device 13 includes, for example, a push-up beam 13a and a push-up jack 13b. The push-up climbing device 13 raises the truss girder 12 by taking a reaction force on the outer surface of the existing main tower base or column. The push-up beam 13a and the push-up jack 13b are attached to the lower surface of the truss girder 12 so as to be laterally movable in the main tower width direction by a lateral push jack or the like, so as to cope with the inclination of the column portion 3a.
[0016]
Forms 20 and scaffolds 21 are installed on the upper surfaces of both ends of the truss girder 12, the formwork 20 rises one lot at a time together with the climbing gantry 10, and the two pillar portions 3a and 3a are sequentially constructed for one lot. Is done. These molds 20 and scaffolds 21 are mounted on, for example, a carriage and can be moved laterally in the width direction of the main tower by a lateral push jack or the like so as to cope with the inclination of the column part 3a.
[0017]
The tower crane 11 is installed outside the formwork 20 and the scaffolding 21 at both ends of the truss girder 12 and carries in materials such as reinforcing bars that precede the formwork 20. The tower crane 11 is installed in a minimum state where no mast is added, and as shown in FIG. 4, the tower crane 11 is lifted together with the climbing gantry 10 to perform crane work. Moreover, the tower crane 11 is moved and fixed to the main tower side corresponding to the column part 3a which inclines.
[0018]
As shown in FIG. 5, when the climbing gantry 10 rises to the front of the main tower coupling portion 4, a scaffold is assembled on the truss girder 12, and the main tower coupling portion 4 is constructed by a total scaffold construction method. Subsequently, a unit mast is added to the lower part of the tower crane 11, and a scaffold is assembled while the mast 11a is extended upward, and the main tower top 5 is constructed by a total scaffold construction method.
[0019]
In the construction of the main tower coupling part 4 and the main tower top part 5, the climbing gantry 10 may be removed, and a bracket (not shown) may be installed on the upper outer surface of the column part instead to serve as the base of the tower crane 11. it can.
[0020]
It is also possible to construct the main tower coupling part 4 and the main tower top part 5 by using the climbing gantry 10, the formwork 20, and the scaffold 21 as they are.
[0021]
In addition, although the above has illustrated the case where it applies to the construction of the inverted Y-shaped main tower of the cable-stayed bridge, the present invention is not limited to this, and the present invention is also applied to the construction of other inverted Y-shaped tower structures. it can.
[0022]
【The invention's effect】
(1) According to the construction method of the present invention, when constructing an inverted Y-shaped tower structure, the construction of the intermediate part of the tower is to carry the climbing form method by placing the tower crane on the climbing gantry in the minimum state. The tower crane stay can be eliminated, and if the total scaffold construction method is used at the top of the tower, the length of the stay can be shortened in the construction of the top of the tower, reducing the equipment costs associated with the construction of the main tower Can be planned.
(2) A push-up type climbing device consisting of a push-up member such as a push-up beam and a push-up device such as a push-up jack is provided on the lower surface of the climbing gantry, and the formwork and scaffolding are provided on the upper part so as to be able to move laterally. Moreover, it can be performed quickly, and the construction time can be shortened and the construction cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a front view showing a starting state of a middle part of a main tower in a construction method of the present invention.
2 is a plan view of FIG. 1. FIG.
FIG. 3 is a side view of FIG. 1;
FIG. 4 is a front view showing from the start state to the end state of the middle part of the main tower of the construction method of the present invention.
FIG. 5 is a front view showing a construction state from the main tower coupling part to the main tower top part of the construction method of the present invention.
FIG. 6 is a front view showing a method of constructing an inverted Y-shaped main tower of a conventional cable-stayed bridge.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Reverse Y-shaped main tower 2 ... Main tower base part 3 ... Main tower center part 3a ... Column part 4 ... Main tower connection part 5 ... Main tower top part 10 ... Climbing gantry 11 ... Tower crane 12 ... Truss girder 13 ... Push-up type climbing device 13a ... Push-up beam 13b ... Push-up jack 20 ... Formwork 21 ... Scaffolding

Claims (2)

基部から２本の柱部が互いに接近するように傾斜して立設され、この２本の柱部の結合部から頂部が突設されている塔状構造物の施工方法であり、２本の柱部の型枠を備え２本の柱部に掛け渡されるクライミング構台の両端部にタワークレーンをマストを継ぎ足していない状態で設置し、このタワークレーンによる資材の搬入とクライミング構台による型枠の上昇を順次繰り返して２本の柱部を施工し、２本の柱部の合体後は、タワークレーンにマストを継ぎ足しながら総足場工法で頂部を施工し、あるいは前記クライミング構台と型枠を利用して頂部を施工することを特徴とする塔状構造物の施工方法。It is a construction method of a tower-like structure in which two pillars are inclined and arranged so as to approach each other from the base, and the top part protrudes from the joint part of the two pillars. Install tower cranes at both ends of the climbing gantry spanned by the two pillars with the column formwork, with no mast added, and carry the material with the tower crane and raise the formwork with the climbing gantry The two pillar parts are constructed by repeating the above, and after the two pillar parts are combined, the top part is constructed by the total scaffold construction method while adding the mast to the tower crane, or by using the climbing gantry and the formwork. A construction method of a tower-like structure characterized by constructing the top. 請求項１に記載の施工方法において、クライミング構台の両端部における下面には既設の塔体に反力をとってクライミング構台を押し上げる押し上げ式クライミング装置が設けられ、このクライミング構台の上に型枠と足場が横移動可能に設けられていることを特徴とする塔状構造物の施工方法。In the construction method according to claim 1, a push-up type climbing device is provided on the lower surface of both ends of the climbing gantry to take up a reaction force on the existing tower body and push up the climbing gantry. A construction method of a tower-like structure, wherein the scaffold is provided so as to be laterally movable.
JP2002139853A 2002-05-15 2002-05-15 Construction method of tower structure Expired - Fee Related JP3952843B2 (en)

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