JP5399202B2 - How to replace the bridge - Google Patents

How to replace the bridge Download PDF

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JP5399202B2
JP5399202B2 JP2009242352A JP2009242352A JP5399202B2 JP 5399202 B2 JP5399202 B2 JP 5399202B2 JP 2009242352 A JP2009242352 A JP 2009242352A JP 2009242352 A JP2009242352 A JP 2009242352A JP 5399202 B2 JP5399202 B2 JP 5399202B2
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bridge
removal section
support
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bridge body
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JP2011089281A (en
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良弘 田中
修 望月
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Taisei Corp
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本発明は、既設の橋梁の架け替えをおこなう際の橋梁の架け替え方法に関するものである。   The present invention relates to a method of replacing a bridge when replacing an existing bridge.

従来、供用中の橋梁が老朽化した際に、橋脚や橋台などの下部構造体を残して、上部構造体である橋桁や床版などの橋体のみを架け替える方法が知られている(特許文献1,2参照)。   Conventionally, when an in-service bridge becomes obsolete, there is a known method in which only a bridge structure such as a bridge girder or floor slab, which is an upper structure, is replaced while leaving a lower structure such as a pier or an abutment (patent) References 1 and 2).

例えば特許文献1の高架橋梁の架替工法では、旧橋桁の下方で新規橋桁を構築し、新規橋桁を支保工昇降機構によって地上から持ち上げる。そして、新規橋桁上に旧橋桁の荷重を支持させた状態で旧橋桁を隣接する橋体から切り離し、新規橋桁を旧橋桁と一緒に上昇させる。   For example, in the method of replacing a viaduct beam in Patent Document 1, a new bridge girder is constructed below the old bridge girder, and the new bridge girder is lifted from the ground by a support lifting mechanism. Then, the old bridge girder is separated from the adjacent bridge body with the load of the old bridge girder supported on the new bridge girder, and the new bridge girder is raised together with the old bridge girder.

また、特許文献2には、特許文献1と同様にして新規橋桁と旧橋桁を同時に持ち上げた後に、旧橋桁を隣接する既設の橋桁上に横移動させて撤去する方法が開示されている。   Patent Document 2 discloses a method in which a new bridge girder and an old bridge girder are lifted at the same time as in Patent Document 1, and then the old bridge girder is moved laterally onto an adjacent existing bridge girder and removed.

特開平11−190008号公報Japanese Patent Laid-Open No. 11-190008 特開2004−332222号公報JP 2004-332222 A

しかしながら従来の方法では、旧橋桁を新規橋桁に支持させて2つの橋体を同時に上昇させるため、大規模な支保工昇降機構が必要になる。また、新規橋桁を地上に近い位置で組み立てた後に旧橋桁の高さまで上昇させるため、載荷状態での上昇距離が長いうえに、ジャッキの盛り替え回数も多くなるので、新規橋桁と旧橋桁とを入れ替えるまでの施工時間が長くなる。   However, in the conventional method, the old bridge girder is supported by the new bridge girder and the two bridge bodies are raised at the same time, so a large-scale support lifting mechanism is required. In addition, since the new bridge girder is assembled at a position close to the ground and then raised to the height of the old bridge girder, the ascending distance in the loaded state is long and the number of jack replacements is increased, so the new bridge girder and the old bridge girder are Construction time until replacement is longer.

そこで、本発明は、簡単な構成によって短期間で実施可能な橋梁の架け替え方法を提供することを目的としている。   Accordingly, an object of the present invention is to provide a bridge replacement method that can be implemented in a short period of time with a simple configuration.

前記目的を達成するために、本発明の橋梁の架け替え方法は、橋脚又は橋台に支持された既設橋体を新設橋体に架け替える橋梁の架け替え方法において、既設橋体の撤去対象となる撤去区分を下方から昇降装置とすべり支承を備えた支保部によって支持させる工程と、前記工程と並行又は前後して前記撤去区分に隣接する位置にすべり支承を介して橋軸方向に延設される新設橋体を組み立てる工程と、前記昇降装置を使って前記撤去区分を上昇させ、前記新設橋体を組み立てた側とは橋軸方向の反対側の前記撤去区分に隣接するすべり支承上に、前記撤去区分を横移動させる工程と、前記新設橋体を前記支保部のすべり支承上に横移動させる工程と、前記昇降装置を使って前記新設橋体を前記橋脚又は橋台上に降下させる工程とを有する。   In order to achieve the above object, the method of replacing a bridge according to the present invention is an object of removal of an existing bridge in the method of replacing a bridge that replaces an existing bridge supported by a pier or an abutment with a new bridge. A step of supporting the removal section from below by a support unit having an elevating device and a slide support, and extending in the direction of the bridge axis via the slide support at a position adjacent to the removal section in parallel with or before and after the process. A step of assembling a new bridge body, raising the removal section using the lifting device, and on the sliding bearing adjacent to the removal section on the opposite side of the bridge axis direction from the side where the new bridge body is assembled, A step of laterally moving the removal section, a step of laterally moving the newly installed bridge body on a sliding support of the support section, and a step of lowering the newly installed bridge body on the pier or abutment using the lifting device. Have.

ここで、前記撤去区分に隣接して、前記既設橋体の残置区分又は架け替え済みの新設橋体が存在する構成であることが好ましい。また、前記移動させた撤去区分は、その場で解体されて搬出されるのが好ましい。   Here, it is preferable that there is a remaining section of the existing bridge body or a new bridge body that has been replaced, adjacent to the removal section. Moreover, it is preferable that the moved removal section is disassembled and carried out on the spot.

さらに、前記すべり支承は、四フッ化エチレン板を積層して形成することができる。また、前記すべり支承は、不動側にエアーキャスタを設けた構成とすることができる。また、前記すべり支承は、複数の球体と、それを収容する不動側箱部と、前記球体上に載置する移動側当接部とを備えた構成とすることができる。   Further, the sliding support can be formed by stacking ethylene tetrafluoride plates. Further, the sliding bearing can be configured such that an air caster is provided on the non-moving side. Moreover, the said slide support can be set as the structure provided with the some spherical body, the immovable side box part which accommodates it, and the movement side contact part mounted on the said spherical body.

そして、前記新設橋体は、セメントと、ポゾラン系反応粒子と、最大粒度径が2.5mm以下の骨材粒子と、分散剤とを含有する組成物を水と混合することにより得られるセメント質マトリックスに、直径が0.1〜0.3mm、長さが10〜30mmの形状の繊維を全容積の1〜4%混入して得られる圧縮強度が150〜200N/mm、曲げ引張強度が25〜45N/mm、割裂引張強度が10〜25N/mmの力学的特性をもつ繊維補強セメント系混合材料によって製作することができる。 The new bridge is a cementitious matrix obtained by mixing a composition containing cement, pozzolanic reactive particles, aggregate particles having a maximum particle size of 2.5 mm or less, and a dispersant with water. In addition, a compressive strength obtained by mixing 1 to 4% of the total volume of fibers having a diameter of 0.1 to 0.3 mm and a length of 10 to 30 mm is 150 to 200 N / mm 2 , and a bending tensile strength is 25 to 45 N / It can be made of a fiber reinforced cementitious mixed material having mechanical properties of mm 2 and split tensile strength of 10 to 25 N / mm 2 .

また、前記支保部は、所定の高さまで組み上げられたベント上に前記昇降装置を設ける構成とすることができる。   Moreover, the said support part can be set as the structure which provides the said raising / lowering apparatus on the vent assembled to predetermined height.

このように構成された本発明の橋梁の架け替え方法は、撤去対象となる撤去区分の橋体を昇降装置で持ち上げた後に支保部のすべり支承で支持させ、すべり支承上を横移動させて撤去区分を撤去するのと入れ替わりに支保部上に新設橋体を横移動させる。   The bridge replacement method of the present invention configured in this way is to lift the bridge body of the removal section to be removed with the lifting device, then support it with the sliding support of the support part, and move it horizontally on the sliding support to remove it. Instead of removing the section, the new bridge body is moved laterally on the support section.

このように撤去区分の橋体と新設橋体とを入れ替わりで支保部に支持させる構成であるため、支保部や昇降装置を大掛りにする必要がなく、簡単な構成にすることができる。また、昇降装置による撤去区分の橋体の上昇は、撤去区分に隣接して配置されたすべり支承に移動できる程度で良いため、上昇量が少なくて済み、短時間で昇降作業をおこなうことができる。   Thus, since it is the structure which replaces the bridge body of a removal section, and a newly installed bridge body and supports it in a support part, it is not necessary to make a support part and a raising / lowering apparatus large, and it can be made a simple structure. In addition, the lifting of the bridge section of the removal section by the lifting device only needs to be able to move to a sliding bearing arranged adjacent to the removal section, so the amount of lift is small, and the lifting work can be performed in a short time. .

さらに、撤去区分を横方向に移動した直後に新設橋体を移動させることができるので、橋体の入れ替えにかかる時間を短くでき、短期間で車両の通行などを再開させることができる。   Furthermore, since the new bridge can be moved immediately after the removal section is moved in the lateral direction, the time required to replace the bridge can be shortened, and vehicle traffic can be resumed in a short period of time.

また、撤去区分に隣接して既設橋体の残置区分又は架け替え済みの新設橋体があれば、新設橋体の組み立てや撤去区分の解体を架け替え箇所の近くで効率的におこなうことができる。特に、撤去区分をその場で解体できれば、大型のクレーンなどを使わなくても、小型のクレーンと既設橋体を走行可能な車両によって搬出をおこなうことができるので、経済的である。   In addition, if there is a remaining section of the existing bridge body or a new bridge body that has been replaced adjacent to the removal section, it is possible to efficiently assemble the new bridge body or dismantle the removal section near the replacement section. . In particular, if the removal section can be dismantled on the spot, it is economical because it can be carried out by a vehicle capable of traveling on a small crane and an existing bridge without using a large crane or the like.

また、四フッ化エチレン板を積層させたり、球体を利用したりするすべり支承であれば、橋体などの重量が大きくなっても破損しにくいうえに、任意の方向に横移動させることができる。   In addition, if it is a sliding bearing made of laminated tetrafluoroethylene plates or using a sphere, it will not easily break even if the weight of the bridge is increased, and can be moved laterally in any direction. .

さらに、エアーキャスタを支保部上などの不動側に設け、橋体の下面に圧縮空気を吹き付けて浮上させる構成であれば、移動距離に制限がなく、任意の距離を効率的に横移動させることができる。   Furthermore, if the air caster is installed on the non-moving side such as on the support and the compressed air is blown to the lower surface of the bridge body, there is no restriction on the moving distance, and any distance can be efficiently moved laterally. Can do.

また、新設橋体を高強度の繊維補強セメント系混合材料によって製作すれば、大幅に自重を低減できるため、横移動が容易になるうえに、橋脚や橋台などの下部構造体にかかる負担も軽減することができる。   In addition, if the new bridge body is made of a high-strength fiber-reinforced cement-based mixed material, its own weight can be greatly reduced, making it easier to move laterally and reducing the burden on lower structures such as piers and abutments. can do.

さらに、支保部を、所定の高さまで組み上げられたベント上に昇降装置を設ける構成にすることで、昇降装置としてストロークの短い小型装置を使用することができる。   Furthermore, a small apparatus having a short stroke can be used as the lifting device by providing the lifting and lowering device on the vent assembled to a predetermined height.

本発明の実施の形態の橋梁の架け替え方法を模式的に説明する側面図である。It is a side view which illustrates typically the method of bridge replacement of the embodiment of the present invention. 撤去区分の橋体を横移動させる工程を説明する側面図である。It is a side view explaining the process of laterally moving the bridge body of a removal division. 新設橋体を横移動させる工程を説明する側面図である。It is a side view explaining the process of moving a new bridge body sideways. 実施例1の四フッ化エチレン板を積層させたすべり支承の構成を説明する部分拡大図である。It is the elements on larger scale explaining the structure of the sliding bearing which laminated | stacked the tetrafluoroethylene board of Example 1. FIG. 実施例1のエアーキャスタを利用したすべり支承の構成を説明する部分拡大図である。It is the elements on larger scale explaining the structure of the slide support using the air caster of Example 1. FIG. 実施例1の複数の球体を利用したすべり支承の構成を説明する部分拡大図である。It is the elements on larger scale explaining the structure of the sliding bearing using the some spherical body of Example 1. FIG. 実施例2の昇降装置の構成を説明する斜視図である。It is a perspective view explaining the structure of the raising / lowering apparatus of Example 2. FIG. 実施例3の橋梁の架け替え方法を模式的に説明する工程図である。It is process drawing which illustrates typically the bridge | bridging replacement method of Example 3. FIG.

以下、本発明の実施の形態について図面を参照して説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図1は、本実施の形態の橋梁1の架け替え方法を適用する既設の橋梁1の構成を説明する側面図である。この橋梁1は、橋脚11,11間又は橋脚11と橋台(図示省略。以下、橋台についても「橋脚11」として説明する。)との間に、単純支持形式で既設橋体2が架け渡されている。   FIG. 1 is a side view illustrating the configuration of an existing bridge 1 to which the bridge 1 replacement method of the present embodiment is applied. The existing bridge body 2 is bridged between the piers 11 and 11 or between the piers 11 and the abutments (not shown. The abutments will also be described as “the piers 11” hereinafter). ing.

この既設橋体2は、例えば橋桁と床版とが一体化された構造となっている。また、既設橋体2は、橋脚11に沓などの支承部12を介して設置されている。そして、本実施の形態の橋梁1の架け替え方法では、支承部12との連結を解除して既設橋体2のみを架け替え、橋脚11,・・・は残して再利用する。   The existing bridge body 2 has a structure in which, for example, a bridge girder and a floor slab are integrated. Further, the existing bridge body 2 is installed on the pier 11 via a support 12 such as a fence. In the method of replacing the bridge 1 according to this embodiment, the connection with the support portion 12 is released, only the existing bridge body 2 is replaced, and the bridge piers 11,.

また、本実施の形態では、図1の既設橋体2のうち、真ん中に図示した撤去区分21を撤去して、新設橋体5に架け替える場合について説明する。そして、撤去区分21の両側には、まだ架け替えが済んでいない既設橋体2の残置区分22,23があるとして以下では説明するが、残置区分22,23が新設橋体5に架け替えられている場合でも、撤去区分21の架け替え方法は同じように実施できる。また、残置区分22,23という用語は、撤去区分21を架け替える時点での状態を示すものであって、その後、新設橋体5に架け替えられる場合を含んでいる。   Further, in the present embodiment, a case will be described in which the removal section 21 illustrated in the middle of the existing bridge body 2 in FIG. 1 is removed and replaced with the new bridge body 5. Then, on both sides of the removal section 21, the remaining sections 22 and 23 of the existing bridge body 2 that has not yet been replaced are described below, but the remaining sections 22 and 23 are replaced with the new bridge body 5. Even if it is, the replacement method of the removal section 21 can be performed in the same manner. Further, the term “remaining sections 22, 23” indicates a state at the time of replacing the removal section 21, and includes a case where the remaining section is replaced with the new bridge body 5.

まず、この撤去区分21の下方には、支保部3を構築する。この支保部3は、所定の高さまで組み上げられる複数のベント31,・・・と、そのベント31の上に設置される昇降装置としてのジャッキ部34と、すべり支承4を支持するためにベント31上に設置される高さ調整部32とを主に備えている。   First, the support part 3 is constructed below the removal section 21. The support portion 3 includes a plurality of vents 31,... Assembled to a predetermined height, a jack portion 34 as an elevating device installed on the vent 31, and a vent 31 for supporting the sliding support 4. The height adjustment part 32 mainly installed is mainly provided.

このベント31は、鉄骨などによって例えば隣接する橋脚11の上面と同じ高さまで組み立てられる仮設の塔状支保工であって、工程の進捗に合わせて高さを伸長させるためのジャッキなどを設ける必要はない。   The vent 31 is a temporary tower-like support that is assembled to the same height as the upper surface of the adjacent pier 11 by a steel frame or the like, and it is necessary to provide a jack or the like for extending the height according to the progress of the process. Absent.

また、ジャッキ部34は、必要な高さの上昇を一度のストロークで伸長できる場合でなければ、盛り替え時に使用する仮置き用のサドル部33を隣接して設置する。   Moreover, if the jack part 34 is not a case where the raise of required height can be extended | stretched by one stroke, the saddle part 33 for temporary placement used at the time of a refilling will be installed adjacently.

さらに、すべり支承4は、横方向に重量物を移動させる際に生じる摩擦抵抗を低減することが可能な支承であり、詳細な構成については実施例1で説明する。   Furthermore, the sliding bearing 4 is a bearing capable of reducing the frictional resistance generated when moving a heavy object in the lateral direction, and the detailed configuration will be described in the first embodiment.

一方、既設橋体2の撤去区分21に替えて設置する新設橋体5は、図2に示すように既設橋体2の残置区分22上で組み立てられる。例えば、プレキャストコンクリート桁などの工場で製作された複数のプレキャストブロック51,・・・を、既設橋体2を走行可能な車両で残置区分22上に搬送する。そして、小型クレーンなどでプレキャストブロック51,・・・を吊り上げて残置区分22の所定の位置に設置し、その場で接合して一体の新設橋体5に組み上げる。   On the other hand, the new bridge body 5 installed in place of the removal section 21 of the existing bridge body 2 is assembled on the remaining section 22 of the existing bridge body 2 as shown in FIG. For example, a plurality of precast blocks 51,... Manufactured in a factory such as a precast concrete girder are transported onto the remaining section 22 by a vehicle that can travel the existing bridge body 2. Then, the precast blocks 51,... Are lifted by a small crane or the like, installed at a predetermined position of the remaining section 22, and joined on the spot to be assembled into an integrated new bridge body 5.

この新設橋体5は、撤去区分21とまったく同じ構造とすることもできるが、コンクリート等のセメント系混合材料の中でも特に超高強度の繊維補強セメント系混合材料を使用して製作することができる。   The new bridge body 5 can have the same structure as the removal section 21, but can be manufactured using an ultrahigh strength fiber-reinforced cement-based mixed material among cement-based mixed materials such as concrete. .

この繊維補強セメント系混合材料は、セメントと、骨材粒子と、ポゾラン系反応粒子と、分散剤とを含有する組成物を水と混合することにより得られるセメント系マトリックスに、繊維を混入して製造する。   This fiber-reinforced cement-based mixed material is obtained by mixing fibers into a cement-based matrix obtained by mixing a composition containing cement, aggregate particles, pozzolanic reactive particles, and a dispersant with water. To manufacture.

ここで、前記骨材粒子には、最大粒度径が3.0mm以下、好ましくは2.5mm以下の硅砂等の骨材粉体を使用する。また、ポゾラン系反応粒子には、粒子径が15μm以下のものを使用する。例えば、粒子径が0.01〜0.5μmの活性度の高いポゾラン系反応粒子としてシリカヒューム等を使用し、粒子径が0.1〜15μmの活性度の低いポゾラン系反応粒子としてフライアッシュや高炉スラグ等を使用する。これらの活性度の異なるポゾラン系反応粒子は、混合したり、単独で使用したりすることができる。また、前記分散剤には、流動性を高めるために高性能減水剤などを少なくとも1種類使用する。   Here, as the aggregate particles, aggregate powder such as cinnabar having a maximum particle size of 3.0 mm or less, preferably 2.5 mm or less is used. Further, as the pozzolanic reaction particles, those having a particle size of 15 μm or less are used. For example, silica fume or the like is used as a highly active pozzolanic reaction particle having a particle size of 0.01 to 0.5 μm, and fly ash or blast furnace slag is used as a low activity pozzolanic reaction particle having a particle size of 0.1 to 15 μm. To do. These pozzolanic reactive particles having different activities can be mixed or used alone. In addition, at least one kind of high-performance water reducing agent is used for the dispersant in order to improve fluidity.

また、繊維には、例えば直径が0.1〜0.3mm程度で、長さが10〜30mm程度の形状の引張り降伏応力度が2600〜2800N/mm2の鋼繊維を使用する。さらに、この鋼繊維は、製造される繊維補強セメント系混合材料の全容積の1〜4%程度の量を混入させる。 For the fiber, for example, a steel fiber having a diameter of about 0.1 to 0.3 mm and a length of about 10 to 30 mm and a tensile yield stress of 2600 to 2800 N / mm 2 is used. Further, this steel fiber is mixed in an amount of about 1 to 4% of the total volume of the fiber-reinforced cementitious mixed material to be produced.

このような配合で製造される前記繊維補強セメント系混合材料によって形成された部材は、圧縮強度が150〜200N/mm2、曲げ引張強度が25〜45N/mm2、割裂引張強度が10〜25N/mm2、透水係数が4.0×10-17cm/sec、塩分拡散係数が0.0019cm2/年、弾性係数が50〜55GPaの特性を有する。 A member formed of the fiber-reinforced cement-based mixed material manufactured with such a composition has a compressive strength of 150 to 200 N / mm 2 , a bending tensile strength of 25 to 45 N / mm 2 , and a split tensile strength of 10 to 25 N. / Mm 2 , water permeability is 4.0 × 10 -17 cm / sec, salinity diffusion coefficient is 0.0019 cm 2 / year, and elastic modulus is 50 to 55 GPa.

そして、このような繊維補強セメント系混合材料を使用して新設橋体5を構築する場合は、通常、鉄筋を配置する必要がない。また、この新設橋体5には、プレストレスを導入することができる。例えば、図示していないがPC鋼線などのPC鋼材を橋軸方向に貫通させてプレストレスを導入する。   And when constructing the new bridge 5 using such a fiber reinforced cementitious mixed material, it is usually unnecessary to arrange reinforcing bars. In addition, prestress can be introduced into the new bridge body 5. For example, although not shown, a prestress is introduced by penetrating a PC steel material such as a PC steel wire in the bridge axis direction.

次に、本実施の形態の橋梁1の架け替え方法について説明する。   Next, a method for replacing the bridge 1 according to the present embodiment will be described.

まず、工場において、新設橋体5を構成する橋桁ブロック及び床版ブロックなどのプレキャストブロック51を製作する。このプレキャストブロック51は、搬送やクレーンによる吊り上げがしやすい大きさに成形される。   First, precast blocks 51 such as a bridge girder block and a floor slab block constituting the new bridge body 5 are manufactured in a factory. The precast block 51 is formed into a size that can be easily conveyed and lifted by a crane.

一方、橋梁1を架け替える現場においては、図1に示すように、既設橋体2の撤去区分21の下方に支保部3を組み立てる。例えば、橋脚11,11間に所定の間隔で複数のベント31,・・・を組み上げ、その上に高さ調整部32とジャッキ部34を橋軸方向に交互に設置する。また、ジャッキ部34を設置した同じベント31に、サドル部33も隣接して設置する。   On the other hand, at the site where the bridge 1 is replaced, the support portion 3 is assembled below the removal section 21 of the existing bridge body 2 as shown in FIG. For example, a plurality of vents 31,... Are assembled between the piers 11 and 11 at a predetermined interval, and the height adjusting unit 32 and the jack unit 34 are alternately installed on the vents in the bridge axis direction. Further, the saddle portion 33 is also installed adjacent to the same vent 31 where the jack portion 34 is installed.

また、撤去区分21と、隣接する残置区分22,23及び橋脚11,11との切り離しをおこなう。例えば、撤去区分21と残置区分22,23で連続している高欄や地覆があれば切断しておく。また、橋脚11の支承部12と撤去区分21との連結は解除しておく。   Further, the removal section 21 is separated from the adjacent remaining sections 22 and 23 and the piers 11 and 11. For example, if there is a handrail or ground cover that is continuous in the removal section 21 and the remaining sections 22 and 23, it is cut. Further, the connection between the support portion 12 of the pier 11 and the removal section 21 is released.

他方、この作業工程と並行して、図2に示すように、残置区分22の上に複数のプレキャストブロック51,・・・を搬送し、その場でプレキャストブロック51,・・・同士を接合して一体の新設橋体5を組み立てる。   On the other hand, in parallel with this work process, as shown in FIG. 2, a plurality of precast blocks 51,... Are transported on the remaining section 22, and the precast blocks 51,. Assemble the new bridge body 5.

この新設橋体5は、残置区分22上に橋軸方向に間隔を置いて設置された複数のすべり支承4,・・・上に、組み立てる前から又は組み立てた後に支持させる。また、この新設橋体5が設置された側とは橋軸方向の反対側の残置区分23上にも、橋軸方向に間隔を置いて複数のすべり支承4,・・・を設置する。   The new bridge body 5 is supported before or after assembling on a plurality of sliding supports 4,... Installed on the remaining section 22 at intervals in the bridge axis direction. Also, a plurality of sliding supports 4,... Are installed at intervals in the bridge axis direction on the remaining section 23 on the opposite side of the bridge axis direction from the side where the new bridge body 5 is installed.

続いて、ジャッキ部34を伸長して、図2に示すように撤去区分21の下面2aが残置区分23の上面2bに載置されたすべり支承4より高い位置に達するまで撤去区分21を上昇させる。この撤去区分21を上昇させる際に、ジャッキ部34の一回のストロークで前述した高さに到達しない場合は、一旦、サドル部33,・・・に撤去区分21を仮支持させ、ジャッキ部34,・・・の位置を盛り替えて、再びジャッキ部34,・・・による上昇を続ける。   Subsequently, the jack portion 34 is extended, and the removal section 21 is raised until the lower surface 2a of the removal section 21 reaches a position higher than the sliding support 4 mounted on the upper surface 2b of the remaining section 23 as shown in FIG. . When the removal section 21 is raised, if the above-described height is not reached by one stroke of the jack section 34, the removal section 21 is temporarily supported by the saddle sections 33,. ,... Are rearranged and the ascending by the jack portions 34,.

そして、所定の高さまで撤去区分21を持ち上げた後に、撤去区分21の荷重を、ジャッキ部34,・・・から高さ調整部32,・・・の上端に設置されたすべり支承4,・・・に受け替える。   Then, after the removal section 21 is lifted to a predetermined height, the load of the removal section 21 is slid from the jack portions 34,... To the height adjustment portions 32,.・ Replace with

このようにして支保部3のすべり支承4,・・・に支持された撤去区分21には、ウインチ又はレバーブロックなどの水平力付加装置(図示省略)の一端を繋ぎ、ウインチ等を操作して残置区分23に向けて橋軸方向に撤去区分21を水平移動させる。この水平移動は、すべり支承4,・・・上でおこなわれるため、水平力付加装置の動力が小さくても容易に撤去区分21を動かすことができる。   In this way, one end of a horizontal force applying device (not shown) such as a winch or a lever block is connected to the removal section 21 supported by the sliding support 4,... Of the support part 3, and the winch or the like is operated. The removal section 21 is moved horizontally in the bridge axis direction toward the remaining section 23. Since this horizontal movement is performed on the sliding supports 4,..., The removal section 21 can be easily moved even if the power of the horizontal force applying device is small.

また、撤去区分21を水平移動させた後の支保部3上に、水平力付加装置を使って図3に示すように新設橋体5を水平移動させる。この新設橋体5の水平移動は、撤去区分21の移動が完全に終わってから開始しても、並行して撤去された部分から順次、おこなってもいずれでもよい。   Moreover, as shown in FIG. 3, the new bridge body 5 is horizontally moved on the support part 3 after horizontally moving the removal section 21 using a horizontal force applying device. The horizontal movement of the new bridge body 5 may be started after the movement of the removal section 21 is completely completed, or may be sequentially performed from the parts removed in parallel.

さらに、支保部3上の所定の位置まで新設橋体5を移動させた後に、高さ調整部32,・・・上のすべり支承4,・・・からジャッキ部34,・・・に新設橋体5の荷重を受け替える。   Further, after the new bridge body 5 is moved to a predetermined position on the support part 3, the new bridge is moved from the slide support 4, ... on the height adjustment part 32, ... to the jack part 34, ... Change the load of the body 5.

そして、高さ調整部32,・・・を撤去して、ジャッキ部34,・・・を縮めることで新設橋体5を所定の高さまで降下させる。この新設橋体5を降下させる際も、必要に応じてサドル部33,・・・を使って、ジャッキ部34,・・・の盛り替えをおこなう。また、所定の高さまで降下させた新設橋体5と、橋脚11,11上の支承部12,12とを連結することで、新設橋体5を橋脚11,11に支持させる。   And the height adjustment part 32, ... is removed, and the new bridge body 5 is lowered | hung to predetermined | prescribed height by shrinking the jack part 34, .... When the new bridge body 5 is lowered, the jack portions 34,... Are replaced using the saddle portions 33,. Further, the new bridge body 5 is supported by the piers 11 and 11 by connecting the new bridge body 5 lowered to a predetermined height and the support portions 12 and 12 on the piers 11 and 11.

さらに、この新設橋体5を降下させる工程と並行又は前後して、残置区分23上に移動させた撤去区分21の解体と搬出をおこなう。すなわち、この解体作業は、橋梁1の走行が可能な大きさの車両によって搬送ができる大きさになるまでおこなわれる。   Further, in parallel or before and after the step of lowering the new bridge body 5, the removal section 21 moved onto the remaining section 23 is disassembled and carried out. That is, this dismantling operation is performed until the vehicle can be transported by a vehicle having a size that allows the bridge 1 to travel.

次に、本実施の形態の橋梁1の架け替え方法の作用について説明する。   Next, the effect | action of the replacement method of the bridge 1 of this Embodiment is demonstrated.

このように構成された本実施の形態の橋梁1の架け替え方法は、撤去対象となる撤去区分21をジャッキ部34で持ち上げた後に支保部3のすべり支承4で支持させ、すべり支承4上を水平移動させて撤去区分21を撤去した後に支保部3上に新設橋体5を移動させる。   The method of replacing the bridge 1 of this embodiment configured as described above is that the removal section 21 to be removed is lifted by the jack part 34 and then supported by the sliding support 4 of the support part 3, and the sliding support 4 is After moving horizontally and removing the removal section 21, the new bridge body 5 is moved onto the support part 3.

このように既設橋体2の撤去区分21と新設橋体5とを入れ替わりで支保部3に支持させる構成であるため、ベント31やジャッキ部34を大掛りにする必要がなく、簡単な構成にすることができる。   As described above, since the removal section 21 of the existing bridge body 2 and the new bridge body 5 are replaced and supported by the support section 3, it is not necessary to make the vent 31 and the jack section 34 large, and the structure is simple. can do.

また、ジャッキ部34による撤去区分21の上昇は、撤去区分21の高さにすべり支承4の高さを加えた程度で良いため、上昇量が少なくて済み、短時間で昇降作業をおこなうことができる。   Further, the lifting of the removal section 21 by the jack portion 34 may be performed by adding the height of the sliding support 4 to the height of the removal section 21, so that the amount of lift is small, and the lifting work can be performed in a short time. it can.

さらに、支保部3を、所定の高さまで組み上げられたベント31上にジャッキ部34を設ける構成にすることで、ジャッキ部34としてストロークの短い小型装置を使用することができる。   Furthermore, the support part 3 is configured such that the jack part 34 is provided on the vent 31 assembled to a predetermined height, so that a small apparatus having a short stroke can be used as the jack part 34.

また、撤去区分21を水平方向に移動した直後に新設橋体5を移動させることができるので、橋体の入れ替えにかかる時間を短くでき、短期間で車両の通行などを再開させることができる。   In addition, since the new bridge body 5 can be moved immediately after the removal section 21 is moved in the horizontal direction, the time required to replace the bridge body can be shortened, and vehicle traffic can be resumed in a short period of time.

さらに、撤去区分21に隣接する両側に既設橋体2の残置区分22,23があれば、新設橋体5の組み立てや撤去区分21の解体を架け替え箇所の近くで効率的おこなうことができる。   Furthermore, if there are the remaining sections 22 and 23 of the existing bridge body 2 on both sides adjacent to the removal section 21, the assembly of the new bridge body 5 and the disassembly of the removal section 21 can be efficiently performed near the replacement location.

特に、撤去区分21を残置区分23上で解体できれば、大型クレーンなどで吊った不安定な状態での解体作業が必要なく、作業性の良い場所で効率的に解体して、小型クレーン等を使って撤去区分21の搬出作業をおこなうことができるので、経済的である。   In particular, if the removal section 21 can be dismantled on the remaining section 23, it is not necessary to dismantle it in an unstable state suspended by a large crane or the like, and it can be efficiently disassembled in a place with good workability and a small crane or the like can be used. Since the removal work of the removal section 21 can be performed, it is economical.

また、新設橋体5を上述した高強度の繊維補強セメント系混合材料によって製作すれば、大幅に自重を低減できるため、水平移動が容易になるうえに、橋脚11などの橋梁1の下部構造体にかかる負担も軽減することができる。   In addition, if the new bridge 5 is made of the above-described high-strength fiber-reinforced cement-based mixed material, its own weight can be greatly reduced. Can also reduce the burden.

以下、実施例1では、前記した実施の形態で概略の機能を説明したすべり支承4の詳細な構成について、図4−図6を参照しながら説明する。なお、前記実施の形態で説明した内容と同一乃至均等な部分の説明については同一符号を付して説明する。   Hereinafter, in Example 1, a detailed configuration of the sliding support 4 whose general function is described in the above-described embodiment will be described with reference to FIGS. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

また、すべり支承4は、既設橋体2上やベント31上など、複数の箇所に設置されるため、以下では、残置区分23の上に設置されて撤去区分21を水平移動させる場合について説明するが、他の箇所に設置する場合も同様の構成である。   Moreover, since the sliding support 4 is installed in several places, such as on the existing bridge body 2 and the vent 31, below, the case where it installs on the remaining division 23 and horizontally moves the removal division 21 is demonstrated. However, it is the same structure also when installing in another location.

まず、図4を参照しながら、四フッ化エチレン板61a,61aを積層させたすべり支承としての低摩擦板支承61について説明する。この低摩擦板支承61は、四フッ化エチレン板61aと鋼板61bとを貼り合わせた複合板611を複数枚、使用して構成する。   First, the low friction plate bearing 61 as a sliding bearing in which the tetrafluoroethylene plates 61a and 61a are laminated will be described with reference to FIG. The low friction plate support 61 is configured by using a plurality of composite plates 611 obtained by bonding an ethylene tetrafluoride plate 61a and a steel plate 61b.

例えば、不動側となる既設橋体2の残置区分23の上面2bに台座61cを固定し、その台座61cの上面に複合板611の鋼板61b側を固定する。他方、移動側となる撤去区分21の下面2aには、複合板611の鋼板61b側を当接させる。この撤去区分21側に配置する複合板611は、撤去区分21の下面2aに固定してもよいし、残置区分23側の複合板611と下面2aとの間に差し込むだけでもよい。   For example, the pedestal 61c is fixed to the upper surface 2b of the remaining section 23 of the existing bridge body 2 on the stationary side, and the steel plate 61b side of the composite plate 611 is fixed to the upper surface of the pedestal 61c. On the other hand, the steel plate 61b side of the composite plate 611 is brought into contact with the lower surface 2a of the removal section 21 on the moving side. The composite plate 611 disposed on the removal section 21 side may be fixed to the lower surface 2a of the removal section 21 or may be simply inserted between the composite plate 611 on the remaining section 23 side and the lower surface 2a.

このように複合板611,611が配置された低摩擦板支承61では、四フッ化エチレン板61a,61a同士が接触する面が滑り面となる。そして、四フッ化エチレン板61a,61a同士を接触させた際の摩擦係数は0.02〜0.05程度であり、小さな水平力を加えるだけで残置区分23に対して撤去区分21を容易に横移動させることができる。   In the low friction plate support 61 in which the composite plates 611 and 611 are arranged in this manner, the surface where the tetrafluoroethylene plates 61a and 61a contact each other is a sliding surface. The coefficient of friction when the tetrafluoroethylene plates 61a and 61a are brought into contact with each other is about 0.02 to 0.05, and the removal section 21 can be easily moved laterally with respect to the remaining section 23 only by applying a small horizontal force. Can do.

また、四フッ化エチレン板61a,61aを積層させた低摩擦板支承61であれば、撤去区分21や新設橋体5などの重量が大きくなっても破損しにくいうえに、任意の方向に横移動させることができる。   In addition, the low friction plate bearing 61 in which the tetrafluoroethylene plates 61a and 61a are laminated is not easily damaged even if the weight of the removal section 21 or the new bridge body 5 is increased, and can be laterally extended in any direction. Can be moved.

さらに、移動側の複合板611を差し込む方式にすることで、撤去区分21の移動に合わせて順次、複合板611を差し込み、反対側から排出された複合板611を回収することによって、少ない複合板611,・・・の枚数で低摩擦板支承61を構成することができる。   Furthermore, by adopting a system in which the composite plate 611 on the moving side is inserted, the composite plate 611 is sequentially inserted in accordance with the movement of the removal section 21, and the composite plate 611 discharged from the opposite side is collected, thereby reducing the number of composite plates The low friction plate support 61 can be configured by the number of sheets 611.

次に、すべり支承としてのエアーキャスタ支承62について、図5を参照しながら説明する。このエアーキャスタ支承62は、不動側となる既設橋体2の残置区分23の台座62c上に、エアーキャスタ62aが取り付けられている。   Next, the air caster bearing 62 as a sliding bearing will be described with reference to FIG. In the air caster support 62, an air caster 62a is mounted on a pedestal 62c of the remaining section 23 of the existing bridge body 2 on the stationary side.

このエアーキャスタ62aは、対象物に圧縮空気を吹き付けることで、対象物又はエアーキャスタ62aが取り付けられた部材を浮上させる装置である。そして、既設橋体2の撤去区分21などの橋体の下面2aは、平坦に形成されていることが多いため、エアーキャスタ62aの吹出口62bを下面2a側に向けて圧縮空気を吹き付けることで、効率よく撤去区分21を浮上させることができる。   The air caster 62a is a device that floats a target or a member to which the air caster 62a is attached by blowing compressed air onto the target. Since the lower surface 2a of the bridge body such as the removal section 21 of the existing bridge body 2 is often formed flat, by blowing compressed air with the air outlet 62b of the air caster 62a facing the lower surface 2a side. The removal section 21 can be efficiently levitated.

このように撤去区分21をエアーキャスタ62aによって浮上させることで、摩擦係数を0.001〜0.01程度にすることができ、小さな水平力を加えるだけで残置区分23に対して撤去区分21を容易に水平移動させることができる。   In this way, the removal section 21 is levitated by the air casters 62a, so that the friction coefficient can be set to about 0.001 to 0.01, and the removal section 21 can be easily moved horizontally with respect to the remaining section 23 only by applying a small horizontal force. Can be made.

また、エアーキャスタ62aを不動側となる残置区分23の上面2b側に設け、移動側となる撤去区分21の下面2aに圧縮空気を吹き付けて浮上させる構成であれば、移動距離に制限がなく、任意の距離を効率的に水平移動させることができる。   In addition, if the air caster 62a is provided on the upper surface 2b side of the remaining section 23 on the non-moving side and the compressed air is blown to the lower surface 2a of the removal section 21 on the moving side, the moving distance is not limited, An arbitrary distance can be efficiently moved horizontally.

次に、図6を参照しながらすべり支承としての鋼球支承63について説明する。この鋼球支承63は、複数の球体としての鋼球63a,・・・と、それを収容する不動側箱部としての収容箱63bと、鋼球63a,・・・上に載置する移動側当接部としてのスライド部63cとを主に備えている。   Next, a steel ball bearing 63 as a sliding bearing will be described with reference to FIG. The steel ball support 63 includes steel balls 63a as a plurality of spheres, a storage box 63b as a non-moving side box for storing the balls, and a moving side mounted on the steel balls 63a. The slide part 63c as a contact part is mainly provided.

この収容箱63bは、撤去区分21の主な移動方向となる橋軸方向に延設される溝形鋼材で、残置区分23の上面2bに固定される。そして、鋼球63a,・・・は、収容箱63bの底面に一層に敷き詰められる。   The storage box 63 b is a grooved steel material extending in the bridge axis direction, which is the main movement direction of the removal section 21, and is fixed to the upper surface 2 b of the remaining section 23. The steel balls 63a,... Are spread all over the bottom surface of the storage box 63b.

また、スライド部63cは、移動側となる撤去区分21の下面2aと平行な下面が形成され、収容箱63bに収容されて鋼球63a,・・・上に支持される構成となっていればよい。この図6に示したスライド部63cは、収容箱63bの内側に重ね合わすことが可能な大きさの溝形鋼材によって形成され、取付板63dを介して撤去区分21の下面2aに固定されている。   Moreover, if the slide part 63c becomes a structure by which the lower surface parallel to the lower surface 2a of the removal section 21 used as a movement side is formed, and it accommodates in the storage box 63b and is supported on the steel ball 63a, ... Good. The slide portion 63c shown in FIG. 6 is formed of a grooved steel material having a size that can be superimposed on the inside of the storage box 63b, and is fixed to the lower surface 2a of the removal section 21 via a mounting plate 63d. .

このように鋼球63a,・・・を利用した鋼球支承63であれば、動摩擦係数を0.2〜0.3程度にすることができ、小さな水平力を加えるだけで残置区分23に対して撤去区分21を容易に水平移動させることができる。   In this way, with the steel ball bearing 63 using the steel balls 63a,..., The dynamic friction coefficient can be set to about 0.2 to 0.3, and the removal section 21 with respect to the remaining section 23 only by applying a small horizontal force. Can be easily moved horizontally.

また、鋼球63a,・・・を利用した鋼球支承63であれば、低価格で製作できるうえに、撤去区分21や新設橋体5などの重量が大きくなっても破損しにくい。さらに、収容箱63bの内空の範囲内であれば任意の方向に容易に横移動させることができる。   In addition, the steel ball bearing 63 using the steel balls 63a,... Can be manufactured at a low price and is not easily damaged even if the weight of the removal section 21 or the new bridge body 5 is increased. Furthermore, it can be easily moved laterally in any direction as long as it is within the inner space of the storage box 63b.

なお、他の構成及び作用効果については、前記実施の形態又は他の実施例と略同様であるので説明を省略する。   Other configurations and functions and effects are substantially the same as those of the above-described embodiment or other examples, and thus description thereof is omitted.

以下、前記した実施の形態で説明した昇降装置とは別の形態の実施例2について、図7を参照しながら説明する。なお、前記実施の形態で説明した内容と同一乃至均等な部分の説明については同一符号を付して説明する。   Hereinafter, Example 2 of a form different from the lifting apparatus described in the above embodiment will be described with reference to FIG. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

この実施例2では、支保部を構成する昇降装置としての門形リフター7について説明する。この門形リフター7は、平行に並べられた2枚の台座板75,75と、それらの上に間隔を置いて立設される4本の伸縮支柱71,・・・と、その伸縮支柱71,71間に架け渡されるサドル梁72,72と、伸縮支柱71,・・・の動力源となる油圧ユニット73,73と、油圧ユニット73,73を操作する操作部74とを主に備えている。   In the second embodiment, a portal lifter 7 serving as a lifting device that constitutes a support portion will be described. The portal lifter 7 includes two pedestal plates 75, 75 arranged in parallel, four telescopic struts 71,... , 71, saddle beams 72, 72, a hydraulic unit 73, 73 serving as a power source for the telescopic struts 71,..., And an operation unit 74 for operating the hydraulic units 73, 73. Yes.

この門形リフター7は、地上から直接、既設橋体2の撤去区分21や新設橋体5を昇降させる装置である。すなわち、撤去区分21の下方の地上に接地された2枚の台座板75,75上に、等間隔でそれぞれ2本の伸縮支柱71,71が立設される。   This portal lifter 7 is a device that lifts and lowers the removal section 21 of the existing bridge body 2 and the new bridge body 5 directly from the ground. That is, two telescopic struts 71 and 71 are erected at equal intervals on the two base plates 75 and 75 that are grounded to the ground below the removal section 21.

この伸縮支柱71は、テレスコピック型の上下方向の伸縮装置であり、所望する昇降高さが確保可能なものを使用する。また、それぞれの伸縮支柱71,71間には、油圧ユニット73が配置される。   The telescopic strut 71 is a telescopic vertical telescopic device, and a telescopic support 71 capable of ensuring a desired elevation height is used. Further, a hydraulic unit 73 is disposed between the respective telescopic columns 71 and 71.

また、サドル梁72は、昇降対象となる例えば撤去区分21の下面2aを当接させる部分で、例えば異なる台座板75,75上に立設された伸縮支柱71,71の上端間に架け渡される。   Further, the saddle beam 72 is a portion where the lower surface 2a of the removal section 21 to be lifted and lowered, for example, is spanned between the upper ends of the telescopic columns 71 and 71 erected on different pedestal plates 75 and 75, for example. .

ここで、同じ油圧ユニット73に接続された台座板75上の伸縮支柱71,71は、同じ高さで伸縮する。また、異なる台座板75,75上に立設された伸縮支柱71,・・・も、操作部74で油圧ユニット73,73を同期させることによって、サドル梁72,72を水平に保ったままで昇降させることができる。   Here, the telescopic struts 71 and 71 on the base plate 75 connected to the same hydraulic unit 73 extend and contract at the same height. Further, the telescopic struts 71,... Erected on the different pedestal plates 75, 75 are also moved up and down while the saddle beams 72, 72 are kept horizontal by synchronizing the hydraulic units 73, 73 with the operation unit 74. Can be made.

このように撤去区分21や新設橋体5を安定して支持させることが可能なサドル梁72,72を備えるとともに、地上から盛り替えることなしに昇降可能な門形リフター7を使用することによって、撤去区分21の上昇、新設橋体5の降下を、迅速におこなうことができる。   In this way, by using the saddle beams 72 and 72 that can stably support the removal section 21 and the new bridge body 5, and by using the portal lifter 7 that can be lifted and lowered without changing from the ground, The removal section 21 can be raised and the new bridge body 5 can be lowered quickly.

ここで、実施例2のように昇降装置として門形リフター7を使用する場合であっても、支保部のすべり支承4は、前記実施の形態で説明したようにベント31上に設けることができる。また、門形リフター7のサドル梁72,72上にすべり支承4を取り付けることで、支保部のすべり支承4の配置を短時間でおこなうことが可能な構成にすることもできる。   Here, even when the portal lifter 7 is used as the lifting device as in the second embodiment, the sliding support 4 of the support portion can be provided on the vent 31 as described in the above embodiment. . Moreover, it can also be set as the structure which can arrange | position the sliding support 4 of a support part in a short time by attaching the sliding support 4 on the saddle beams 72 and 72 of the portal lifter 7. FIG.

なお、他の構成及び作用効果については、前記実施の形態又は他の実施例と略同様であるので説明を省略する。   Other configurations and functions and effects are substantially the same as those of the above-described embodiment or other examples, and thus description thereof is omitted.

以下、前記した実施の形態とは別の形態の実施例3について、図8を参照しながら説明する。なお、前記実施の形態で説明した内容と同一乃至均等な部分の説明については同一符号を付して説明する。   Hereinafter, Example 3 of a form different from the above-described embodiment will be described with reference to FIG. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

この実施例3では、単純支持形式の既設橋体2を、連続支持形式の新設橋体に架け替える橋梁1の架け替え方法について説明する。ここで、実施例3では、既設橋体2の3つの単純支持桁を撤去区分21A,21B,21Cとして架け替える場合について説明する。   In the third embodiment, a method for replacing the bridge 1 in which the existing bridge body 2 of the simple support type is replaced with the new bridge body of the continuous support type will be described. Here, Example 3 demonstrates the case where three simple support girders of the existing bridge body 2 are replaced as removal division 21A, 21B, 21C.

まず、図8(a)に示すように、撤去区分21A,21B,21Cの下方に支保部3,3,3をそれぞれ構築する。また、撤去区分21A,21B,21Cを水平移動させる残置区分23A,23B,23C上に、それぞれすべり支承4,・・・を設置する。さらに、新設橋体を組み立てる残置区分22上にもすべり支承4,・・・を設置する。   First, as shown to Fig.8 (a), the support parts 3,3,3 are each constructed | assembled under the removal divisions 21A, 21B, and 21C. Further, sliding supports 4,... Are installed on the remaining sections 23A, 23B, and 23C for horizontally moving the removal sections 21A, 21B, and 21C, respectively. Furthermore, sliding supports 4,... Are also installed on the remaining section 22 for assembling the new bridge body.

続いて、新設橋体としての三径間連続桁8を残置区分22上で組み立てる。また、撤去区分21A,21B,21Cを隣接する橋体及び橋脚11,11から切り離す。さらに、固定が解除された撤去区分21A,21B,21Cを、支保部3,3,3のジャッキ部34,・・・を動作させて所定の高さまで持ち上げる。   Subsequently, the three-span continuous girder 8 as a new bridge body is assembled on the remaining section 22. Further, the removal sections 21A, 21B, and 21C are separated from the adjacent bridge bodies and piers 11 and 11. Further, the removal sections 21A, 21B, and 21C that are released from the fixed state are lifted to a predetermined height by operating the jack portions 34,... Of the support portions 3, 3, and 3.

そして、図8(b)に示すように、撤去区分21A,21B,21Cを、すべり支承4,・・・上を滑らせてそれぞれ残置区分23A,23B,23C上に水平移動させる。また、撤去区分21A,21B,21Cの移動後の支保部3,3,3上に三径間連続桁8を水平移動させる。   Then, as shown in FIG. 8B, the removal sections 21A, 21B, and 21C are slid on the sliding supports 4,... And horizontally moved onto the remaining sections 23A, 23B, and 23C, respectively. Further, the three-span continuous girder 8 is horizontally moved on the support portions 3, 3, and 3 after the removal sections 21A, 21B, and 21C are moved.

さらに、支保部3,3,3上に移動させた三径間連続桁8を、ジャッキ部34,・・・の動作によって降下させ、橋脚11,11,11,11上に支持させる。また、残置区分23A,23B,23C上に移動させた撤去区分21A,21B,21Cは、その場で解体し、搬出する。   Further, the three-span continuous girder 8 moved onto the support portions 3, 3, 3 is lowered by the operation of the jack portions 34,... And supported on the piers 11, 11, 11, 11. Further, the removal sections 21A, 21B, and 21C moved onto the remaining sections 23A, 23B, and 23C are disassembled on the spot and carried out.

このように実施例3の橋梁1の架け替え方法を実施することによって、図8(c)に示すように、単純支持形式の既設橋体2の撤去区分21A,21B,21Cを、三径間連続桁8に短期間で架け替えることができる。   By carrying out the method of replacing the bridge 1 of Example 3 in this way, as shown in FIG. 8 (c), the removal sections 21A, 21B, and 21C of the existing bridge body 2 of the simple support type are separated into three spans. It is possible to replace the continuous digit 8 in a short time.

なお、他の構成及び作用効果については、前記実施の形態又は他の実施例と略同様であるので説明を省略する。   Other configurations and functions and effects are substantially the same as those of the above-described embodiment or other examples, and thus description thereof is omitted.

以上、図面を参照して、本発明の実施の形態及び実施例を詳述してきたが、具体的な構成は、この実施の形態及び実施例に限らず、本発明の要旨を逸脱しない程度の設計的変更は、本発明に含まれる。   The embodiments and examples of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the embodiments and examples, and the gist of the present invention is not deviated. Design changes are included in the present invention.

例えば、前記実施の形態及び実施例では、残置区分22の上で新設橋体5(8)を組み立て、残置区分23(23A−23C)に撤去区分21(21A−21C)を移動させて解体する場合について説明したが、これに限定されるものではなく、残置区分22,23が新設橋体5に架け替わっていたり、橋梁1に接続される道路などが撤去区分21に隣接していたりする場合も、本発明の橋梁1の架け替え方法を適用することができる。   For example, in the said embodiment and Example, the new bridge body 5 (8) is assembled on the remaining section 22, and the removal section 21 (21A-21C) is moved to the remaining section 23 (23A-23C) and disassembled. Although the case has been described, the present invention is not limited to this, and the remaining sections 22 and 23 are replaced with the newly installed bridge body 5 or the road connected to the bridge 1 is adjacent to the removal section 21 In addition, the bridge 1 replacement method of the present invention can be applied.

また、前記実施の形態では、セメント系混合材料によって成形された新設橋体5について説明したが、これに限定されるものではなく、鋼製、コンクリートと鋼材の合成部材などで新設橋体を製作することもできる。さらに、橋桁だけを新設橋体5として架け替えをおこない、床版は別途、構築するという方法にも本発明を適用することができる。   Moreover, in the said embodiment, although the new bridge body 5 shape | molded with the cement-type mixed material was demonstrated, it is not limited to this, A new bridge body is manufactured with steel, the composite member of concrete and steel materials, etc. You can also Furthermore, the present invention can also be applied to a method in which only the bridge girder is replaced as the new bridge body 5 and the floor slab is separately constructed.

また、実施例1では3種類のすべり支承の詳細について説明したが、これに限定されるものではなく、さらに、すべり支承はすべて同じ種類のすべり支承を使用しなければならないことはなく、種々のすべり支承を場所によって変えて設置してもよい。   In the first embodiment, the details of the three types of sliding bearings have been described. However, the present invention is not limited to this, and the sliding bearings do not have to use the same type of sliding bearings. Sliding bearings may be installed in different places.

1 橋梁
11 橋脚
2 既設橋体
21 撤去区分
22,23 残置区分
2a 下面
2b 上面
3 支保部
31 ベント
34 ジャッキ部(昇降装置)
4 すべり支承
5 新設橋体
61 低摩擦板支承(すべり支承)
61a 四フッ化エチレン板
62 エアーキャスタ支承(すべり支承)
62a エアーキャスタ
63 鋼球支承(すべり支承)
63a 鋼球(球体)
63b 収容箱(不動側箱部)
63c スライド部(移動側当接部)
7 門形リフター(昇降装置)
8 三径間連続桁(新設橋体)
21A,21B,21C 撤去区分
23A,23B,23C 残置区分
DESCRIPTION OF SYMBOLS 1 Bridge 11 Pier 2 Existing bridge body 21 Removal section 22, 23 Remaining section 2a Lower surface 2b Upper surface 3 Supporting part 31 Vent 34 Jack part (elevating device)
4 Sliding bearing 5 New bridge 61 Low friction plate bearing (sliding bearing)
61a Ethylene tetrafluoride plate 62 Air caster support (slide support)
62a Air caster 63 Steel ball bearing (sliding bearing)
63a Steel ball (sphere)
63b Storage box (non-moving side box)
63c Slide part (moving side contact part)
7 Portal lifter (elevating device)
8 Three span span girder (new bridge)
21A, 21B, 21C Removal section 23A, 23B, 23C Remaining section

Claims (7)

橋脚又は橋台に支持された既設橋体を新設橋体に架け替える橋梁の架け替え方法において、
既設橋体の撤去対象となる撤去区分である前記橋脚間、橋脚と橋台間又は橋台間に複数のベントを所定の高さまで組み上げて、それらのベント上にジャッキ部と、すべり支承を支持するための高さ調整部とを設置して支保部を形成し、前記撤去区分を下方から前記支保部によって支持させる工程と、
前記工程と並行又は前後して前記撤去区分に隣接する位置にすべり支承を介して橋軸方向に延設される新設橋体を組み立てる工程と、
前記ジャッキ部を使って前記撤去区分を上昇させ、前記新設橋体を組み立てた側とは橋軸方向の反対側の前記撤去区分に隣接するすべり支承上に、前記撤去区分を横移動させる工程と、
前記新設橋体を前記ベント上の高さ調整部のすべり支承上に横移動させる工程と、
前記ジャッキ部を使って前記新設橋体を前記橋脚又は橋台上に降下させる工程とを有することを特徴とする橋梁の架け替え方法。
In the method of replacing a bridge that replaces an existing bridge supported by a pier or abutment with a new bridge,
To assemble a plurality of vents to a predetermined height between the piers, between the piers and abutments or between the abutments, which are the removal target of existing bridge bodies, and to support the jack part and the sliding support on those vents Forming a support part by installing a height adjusting part, and supporting the removal section by the support part from below ;
Assembling a new bridge extending in the axial direction of the bridge via a sliding support at a position adjacent to the removal section in parallel or before and after the step;
Using the jack portion to raise the removal section, and laterally moving the removal section on a sliding bearing adjacent to the removal section on the opposite side of the bridge axis direction from the side where the new bridge is assembled; ,
A step of laterally moving the newly installed bridge body on a slide support of a height adjusting portion on the vent;
And a step of lowering the newly installed bridge body onto the pier or abutment using the jack portion .
前記撤去区分に隣接して、前記既設橋体の残置区分又は架け替え済みの新設橋体が存在することを特徴とする請求項1に記載の橋梁の架け替え方法。   The bridge replacement method according to claim 1, wherein there is a remaining section of the existing bridge body or a new bridge body that has been replaced adjacent to the removal section. 前記移動させた撤去区分は、その場で解体されて搬出されることを特徴とする請求項1又は2に記載の橋梁の架け替え方法。   The bridge replacement method according to claim 1 or 2, wherein the removed removal section is dismantled and carried out on the spot. 前記すべり支承は、四フッ化エチレン板を積層して形成することを特徴とする請求項1乃至3のいずれか一項に記載の橋梁の架け替え方法。   The bridge replacement method according to any one of claims 1 to 3, wherein the sliding support is formed by stacking ethylene tetrafluoride plates. 前記すべり支承は、不動側にエアーキャスタを設けた構成であることを特徴とする請求項1乃至3のいずれか一項に記載の橋梁の架け替え方法。   The bridge replacement method according to any one of claims 1 to 3, wherein the sliding support has a configuration in which an air caster is provided on the non-moving side. 前記すべり支承は、複数の球体と、それを収容する不動側箱部と、前記球体上に載置する移動側当接部とを備えていることを特徴とする請求項1乃至3のいずれか一項に記載の橋梁の架け替え方法。   The said sliding support is provided with the some spherical body, the immovable side box part which accommodates it, and the movement side contact part mounted on the said spherical body, The any one of Claim 1 thru | or 3 characterized by the above-mentioned. The bridge replacement method described in item 1. 前記新設橋体は、セメントと、ポゾラン系反応粒子と、最大粒度径が2.5mm以下の骨材粒子と、分散剤とを含有する組成物を水と混合することにより得られるセメント質マトリックスに、直径が0.1〜0.3mm、長さが10〜30mmの形状の繊維を全容積の1〜4%混入して得られる圧縮強度が150〜200N/mm、曲げ引張強度が25〜45N/mm、割裂引張強度が10〜25N/mmの力学的特性をもつ繊維補強セメント系混合材料によって製作されることを特徴とする請求項1乃至6のいずれか一項に記載の橋梁の架け替え方法。 The new bridge is a cementitious matrix obtained by mixing a composition containing cement, pozzolanic reactive particles, aggregate particles having a maximum particle size of 2.5 mm or less, and a dispersant with water. Compressive strength obtained by mixing 1 to 4% of the fiber with a diameter of 0.1 to 0.3 mm and length of 10 to 30 mm is 150 to 200 N / mm 2 , and bending tensile strength is 25 to 45 N / mm 2 , bridges hung replacement method according to any one of claims 1 to 6, characterized in that split Tensile strength is manufactured by fiber reinforced cementitious composite material having mechanical properties of 10~25N / mm 2 .
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