JP2006083610A - Inverted construction method - Google Patents

Inverted construction method Download PDF

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JP2006083610A
JP2006083610A JP2004269935A JP2004269935A JP2006083610A JP 2006083610 A JP2006083610 A JP 2006083610A JP 2004269935 A JP2004269935 A JP 2004269935A JP 2004269935 A JP2004269935 A JP 2004269935A JP 2006083610 A JP2006083610 A JP 2006083610A
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floor
work floor
work
floor unit
main
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JP4362824B2 (en
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Kazuhiko Isoda
和彦 磯田
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Shimizu Construction Co Ltd
Shimizu Corp
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Shimizu Construction Co Ltd
Shimizu Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a simply executable and effective inverted construction method. <P>SOLUTION: After the construction of a permanent sub-substructural column pile 3 and a permanent sub-substructural column 2, an upper end of the permanent sub-substructural column is exposed by excavating a surface layer section of ground, and a working floor unit 1 is descendably installed in each of each span which is surrounded by the four permanent sub-substructural columns. A skeleton on an underground floor is constructed by using the working floor unit 1 as scaffolding, and lower ground is further excavated. After the completion of excavation equivalent to one story, each of the working floor units is lowered by one story in the state of being hung and supported from the constructed skeleton. After the excavation is performed up to a floor directly on a lowermost floor by repeating the above steps, the working floor unit is installed in each span as a finally-installed floor-beam structure on the floor, and the ground below the working floor unit is further excavated so that a skeleton and a foundation on the lowermost floor can be constructed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、建物の地下部の施工法である逆打ち工法に関する。   The present invention relates to a reverse driving method that is a construction method for an underground part of a building.

周知のように、建物の地下部の施工法としての逆打ち工法は通常の順打ち工法に比較して工期短縮を図ることができるものとして従来より広く採用されており、たとえば特許文献1にはジャッキを組み込んだ仮設切梁兼用ステージを用いる逆打ち工法が提案されている。
特開平5−280063号公報
As is well known, the reverse hammering method as a construction method for the underground part of a building has been widely used as a method for shortening the construction period compared to a normal order-placing method. A reverse driving method using a temporary combined beam stage incorporating a jack has been proposed.
JP-A-5-280063

しかし、従来一般の逆打ち工法では掘削と地下階の躯体の施工を同時に行うことから掘削土の搬出や資材の搬入等が錯綜し、必ずしも効率的な施工が行えない場合もある。また特許文献1に示される逆打ち工法は大がかりなステージを必要とするし、それを降下させていくためには複雑かつ高度な施工管理を必要とし、広く一般に適用し得るものではない。   However, in the conventional general reverse driving method, excavation and construction of the basement floor are performed at the same time, so that excavation soil is carried out and materials are carried in, so that efficient construction may not always be performed. Moreover, the reverse driving method shown in Patent Document 1 requires a large stage, and in order to lower it, it requires complicated and sophisticated construction management, and is not widely applicable.

上記事情に鑑み、本発明はより簡易に実施でき効率的な施工が可能である有効な逆打ち工法を提供することを目的とする。   In view of the above circumstances, it is an object of the present invention to provide an effective reverse driving method that can be implemented more simply and can be efficiently constructed.

請求項1の発明は建物の地下部を施工するための逆打ち工法であって、地表部から地盤中に構真柱杭および構真柱を施工した後、地盤表層部を掘削して構真柱の上端部を露出せしめ、4本の構真柱により囲まれる各スパンにそれぞれ作業床ユニットを降下可能に設置し、それら作業床ユニットを足場として躯体を施工するとともに各作業床ユニットの下方地盤を掘削し、1階層分の掘削を行ったら各作業床ユニットを施工済みの躯体から吊り支持して1階層分降下させて再び各スパンに降下可能に設置し、上記工程を繰り返して最下階の直上の階までの掘削が完了した時点で各作業床ユニットをその階の本設の床梁構造体として各スパンに設置するとともに、その下方地盤をさらに掘削して最下階の躯体および基礎を施工することを特徴とする。   The invention of claim 1 is a reverse driving method for constructing an underground part of a building, and after constructing a pillar pillar and a pillar in the ground from the surface part, excavating the surface part of the ground The upper end of the pillar is exposed, work floor units are installed in each span that can be lowered on each span surrounded by the four structural pillars, and the frame is constructed using these work floor units as scaffolds and the ground below each work floor unit After excavating one floor, each work floor unit is suspended and supported from the installed frame, lowered by one floor and installed so that it can be lowered to each span again. Repeat the above steps to repeat the bottom floor When the excavation to the floor directly above is completed, each work floor unit is installed in each span as a main floor beam structure on that floor, and the lower ground is further excavated to form the bottom floor frame and foundation It is characterized by constructing .

請求項2の発明は請求項1の発明の逆打ち工法において、各スパンに設置する作業床ユニットを、施工中は構真柱に対して仮締結され最終的には本設として構真柱間に架設される一方向の一対2本の大梁と、それら大梁間に架設された小梁と、それら大梁および小梁上に敷設されたデッキとにより構成し、かつそれら作業床ユニットを隣接するスパンに設置するに当たっては、双方の作業床ユニットにおける大梁が互いに直交方向となるように配置して双方の大梁を同一構真柱の互いに直交する周面に対してそれぞれ仮締結することを特徴とする。   The invention of claim 2 is the reverse driving method of the invention of claim 1, wherein the work floor unit installed in each span is temporarily fastened to the construction pillar during construction and is finally installed as a permanent construction between the construction pillars. A span that is composed of a pair of two beams in one direction that are erected on one side, a small beam that is laid between the large beams, and a deck that is laid on the large beam and the small beam, and that has adjacent work floor units. When installing to the floor, the large beams in both work floor units are arranged so that they are orthogonal to each other, and both large beams are temporarily fastened to the mutually orthogonal peripheral surfaces of the same column. .

請求項3の発明は請求項2の発明の逆打ち工法において、構真柱としてコンクリート充填鋼管柱を採用するとともに、作業床ユニットを構成する大梁および各階に架設する本設の大梁としていずれもH形鋼を採用し、施工中において作業床ユニットを各スパンに設置するに当たっては、構真柱の周面に溶接した仮設シヤープレートに対して作業床ユニットにおける大梁のウェブを添え板を介して仮締結し、本設の大梁を構真柱間に架設するに当たっては、構真柱の周面に溶接したシヤープレートと外ダイヤフラムからなる本設ブラケットに対して大梁のウェブを添え板を介してボルト締結するとともに上下フランジを溶接することにより剛接合し、作業床ユニットを最終的に本設の床梁構造体として設置するに当たっては、構真柱の周面に前記仮設シヤープレートに代えて溶接した前記本設ブラケットに対して大梁のウェブを添え板を介してボルト締結するとともに上下フランジを溶接することにより剛接合することを特徴とする。   According to a third aspect of the present invention, in the reverse driving method of the second aspect of the invention, a concrete-filled steel pipe column is used as the construction column, and both the large beam constituting the work floor unit and the main beam installed on each floor are H. In order to install the work floor unit in each span during construction, a large beam web in the work floor unit is temporarily attached to the temporary shear plate welded to the circumferential surface of the structural pillar through an attachment plate. When fastening and installing the main beam between the structural pillars, the web of the large beam is bolted to the main bracket consisting of a shear plate and an outer diaphragm welded to the peripheral surface of the structural column via an attachment plate. When the work floor unit is finally installed as a main floor beam structure, the front and rear flanges are welded together by fastening the upper and lower flanges. It characterized by rigidly joined by welding the upper and lower flanges with bolt fastened through the served plate girder webs to the present setting bracket welded in place temporary Shiyapu rate.

請求項4の発明は請求項1,2または3の発明の逆打ち工法において、作業床ユニットの下面側に各種資機材や掘削土を搬送するための搬送手段を設置し、作業床ユニットの下方地盤の掘削作業や基礎の施工をその搬送手段を用いて行うことを特徴とする。   According to a fourth aspect of the present invention, in the reverse driving method according to the first, second or third aspect of the present invention, a conveying means for conveying various materials and excavated soil is installed on the lower surface side of the work floor unit, The ground excavation work and foundation construction are performed using the transport means.

請求項1の発明によれば、各スパンに小規模な作業用ユニットを降下可能に設置し、それを順次降下させていって各階において作業足場とすることで、地下階の各階の躯体の施工およびその下方地盤に対する掘削工事を効率的に実施することができる。そして、各作業用ユニットをそれぞれ施工済みの躯体から吊り支持して独立に降下させていくことが可能であり、したがってチェーンブロックやウインチ等の簡易な装置を用いることのみで各作業床ユニットを簡便にかつ安全に降下させることができ、大がかりな装置や高度の施工管理を必要としない。さらに、作業床ユニットを最終的には本設の床梁構造体として利用してそのまま残置するので、その解体や搬出の手間が不要であり合理的である。   According to the first aspect of the present invention, a small work unit is installed in each span so as to be able to descend, and the units are descended in order and used as work scaffolds on each floor, so that the construction of the frame on each floor of the basement floor is performed. And excavation work for the ground below it can be carried out efficiently. It is possible to suspend and support each work unit from an already constructed frame and to lower it independently. Therefore, each work floor unit can be simplified simply by using a simple device such as a chain block or winch. It can be moved down safely and safely, and does not require extensive equipment or advanced construction management. Furthermore, since the work floor unit is finally left as it is as the main floor beam structure, it is not necessary to dismantle or carry out the work, which is reasonable.

特に、請求項2の発明によれば、作業床ユニットを大梁と小梁とデッキとにより構成することにより充分に軽量なものとでき、それをそのまま本設の床梁構造体として利用してその上部にコンクリートを打設することのみで床を直ちに形成することができる。しかも、各作業床ユニットを全体として市松配置することにより、最外周部の大梁の一部を除いてほぼ全ての大梁を作業床ユニットの大梁としてそのまま利用することができる。   In particular, according to the second aspect of the present invention, the work floor unit can be made sufficiently light by comprising a large beam, a small beam, and a deck, and can be used as it is as a main floor beam structure. A floor can be immediately formed only by placing concrete on the top. Moreover, by arranging the respective work floor units in a checkered pattern as a whole, almost all of the large beams can be used as they are as the large beams of the work floor unit except for a part of the large outermost beam.

また、請求項3の発明によれば、作業床ユニットにおける大梁のウェブを仮設シヤープレートに対して仮締結することで着脱を容易に行えるし、構真柱の建て込み施工誤差を添え板により吸収することもできる。また、作業床ユニットを本設の床梁構造体として架設する際には仮設シヤープレートに代えて本設ブラケットに対してボルト締結と現場溶接とを併用することにより確実強固に剛接合することができる。勿論、各階の本来の大梁も同様に本設ブラケットを介して構真柱に対して確実に剛接合することができる。   According to the invention of claim 3, the web of the large beam in the work floor unit can be easily attached and detached by temporarily fastening it to the temporary shear plate, and the construction error of the construction column is absorbed by the attached plate. You can also In addition, when the work floor unit is installed as a permanent floor beam structure, it can be firmly and firmly joined to the main bracket by using bolt fastening and field welding in place of the temporary shear plate. it can. Of course, the original girder on each floor can be firmly and securely joined to the frame column via the main bracket as well.

さらに、請求項4の発明によれば、作業床ユニットの下面側に搬送手段を設置することで、作業床ユニットの下方地盤の掘削に際しての掘削土の搬出作業等を効率的に実施することができる。   Furthermore, according to the invention of claim 4, by installing the conveying means on the lower surface side of the work floor unit, it is possible to efficiently carry out the excavation work of the excavated soil when excavating the lower ground of the work floor unit. it can.

図1〜図5を参照して本発明の一実施形態を説明する。本実施形態の逆打ち工法は、後述する作業床ユニット1を構真柱2間の各スパンに降下可能に設置し、それら作業床ユニット1を個々に順次降下させつつ地下階の施工を行い、それら作業床ユニット1を最終的には本設の床梁構造体5としてそのまま残置することを基本とする。   An embodiment of the present invention will be described with reference to FIGS. The reverse driving method of the present embodiment is configured such that a work floor unit 1 to be described later can be lowered on each span between the structural pillars 2 and then the work floor unit 1 is sequentially lowered individually to construct the basement floor, Basically, these work floor units 1 are finally left as they are as a permanent floor beam structure 5.

図1〜図2は本実施形態の逆打ち工法により地下3階までの施工を行う場合の基本的な作業手順の一例を示すものである。まず図1(a)に示すように地表から地盤中に構真柱杭3および構真柱2を施工する。それら構真柱杭3と構真柱2は周知の構造のものを周知の工法によって適宜施工すれば良いが、本実施形態では構真柱杭3としてコンクリート杭を採用し、構真柱2として鋼管内にコンクリートを充填したコンクリート充填鋼管柱(いわゆるCFT柱)を採用している。   1 to 2 show an example of a basic work procedure in the case of performing construction up to the third basement floor by the reverse driving method of the present embodiment. First, as shown in FIG. 1 (a), the structural pillar pile 3 and the structural pillar 2 are constructed from the ground surface into the ground. These structural pillar piles 3 and structural pillars 2 may be appropriately constructed by well-known construction methods, but in this embodiment, concrete piles are employed as the structural pillar piles 3 as the structural pillars 2. A concrete-filled steel pipe column (so-called CFT column) in which concrete is filled in the steel pipe is adopted.

次に、図1(b)に示すように地盤表層部を一次掘削した後、作業床ユニット1を構真柱2に仮締結して掘削底面付近に設置し、それを作業足場として(c)に示すようにその上部に地上1階の床梁として本設の大梁4(4a)を構真柱2間に架設するとともに地下1階におけるその他の躯体を施工する。また、それと同時に作業床ユニット1の下方地盤を1階層分だけ二次掘削する。その掘削作業に際しては作業床ユニット1の下面側にたとえばホイストクレーン等の簡易な搬送手段を設置しておき、それにより資機材を搬送したり掘削土を搬出することで効率的な掘削が可能である。   Next, after primary excavation of the ground surface layer as shown in FIG. 1 (b), the work floor unit 1 is temporarily fastened to the construction pillar 2 and installed near the bottom of the excavation, and this is used as a work scaffold (c) As shown in Fig. 2, a main beam 4 (4a) as a floor beam on the first floor above the ground is installed between the construction pillars 2 and other frames on the first basement floor are constructed. At the same time, the ground below the work floor unit 1 is subjected to secondary excavation for one layer. For the excavation work, simple transport means such as a hoist crane is installed on the lower surface side of the work floor unit 1 so that efficient excavation is possible by transporting materials and equipment or carrying out excavated soil. is there.

所定深度までの二次掘削が完了したら、作業床ユニット1をたとえばチェーンブロックやウインチ等の簡易な揚重手段を用いて上記の大梁4aから吊り支持し、図2(d)に示すように二次掘削底面付近まで降下させ、その位置で再び構真柱2に仮締結して設置する。そして、上記と同様にして作業床ユニット1を作業足場として地下1階の床梁としての本設の大梁4(4b)を施工すると同時に、(e)に示すように下方地盤を三次掘削し、作業床ユニット1を大梁4bから吊り支持してさらに降下させて三次掘削底面付近に配置し、ここで(f)に示すように地下2階の本設の床梁構造体5として構真柱2間に架設する。しかる後に、その下方地盤をさらに掘削し、基礎6および最下階である地下3階の躯体を施工する。   When the secondary excavation up to a predetermined depth is completed, the work floor unit 1 is suspended and supported from the above-mentioned large beam 4a by using a simple lifting means such as a chain block or a winch, for example, as shown in FIG. Next, it is lowered to the vicinity of the bottom of the excavation, and at that position, it is temporarily fastened to the structural pillar 2 and installed again. And, in the same manner as described above, the construction of the main beam 4 (4b) as a floor beam on the first basement floor using the work floor unit 1 as a work scaffold, and at the same time, the lower ground is tertiary excavated as shown in (e), The working floor unit 1 is suspended and supported from the girder 4b and further lowered and arranged near the bottom of the tertiary excavation. Here, as shown in FIG. Build between them. After that, the lower ground is further excavated, and the foundation 6 and the basement on the third basement floor which is the lowest floor are constructed.

図3〜図4は上記の作業床ユニット1の一具体例を示すものである。この作業床ユニット1は、上記のように最終的には地下2階の床梁構造体5として架設されることでそのまま本設の床梁となる一対2本の大梁11と、それら大梁11間に架設された小梁12(図示例では3本)と、それら大梁11および小梁12上に敷設されたデッキ13(図4(b)参照。そのリブの方向を図3に矢印で示してある)とにより構成されたものである。   3 to 4 show a specific example of the work floor unit 1 described above. As described above, the work floor unit 1 is finally constructed as a floor beam structure 5 on the second basement floor, so that a pair of large beams 11 that are to be the main floor beams as they are, and a space between the large beams 11. And the beam 13 (three in the illustrated example) and the deck 13 laid on the beam 11 and the beam 12 (see FIG. 4B. The direction of the ribs is indicated by arrows in FIG. A).

本実施形態においては、図3に示すように同一形態の作業床ユニット1を4本の構真柱2により囲まれる各スパン内にそれぞれ設置してそれらを独立に降下可能としているのであるが、隣り合うスパンに設置する作業床ユニット1の向きを90度異なるように全体として市松配置とする。つまり、隣接する作業床ユニット1の双方の大梁11をそれぞれX方向およびY方向の大梁として同一の構真柱2の直交する周面に対して仮締結する。なお、必要であれば図4に示すように隣り合う作業床ユニット1間に敷鋼板14等を着脱可能に設置して隙間を塞ぐとともに足場とすれば良い。   In this embodiment, as shown in FIG. 3, the work floor unit 1 of the same form is installed in each span surrounded by the four construction pillars 2 and can be lowered independently. As a whole, the checkerboard is arranged so that the directions of the work floor units 1 installed in adjacent spans are different by 90 degrees. That is, both the large beams 11 of the adjacent work floor units 1 are temporarily fastened to the orthogonal circumferential surfaces of the same structural column 2 as the large beams in the X direction and the Y direction, respectively. If necessary, as shown in FIG. 4, a sheet steel 14 or the like may be detachably installed between adjacent work floor units 1 to close the gap and serve as a scaffold.

作業床ユニット1および本設の大梁4を構真柱2に対して接合するための構造を図5に示す。施工中において作業床ユニット1を各スパンに降下可能に設置するに当たっては、構真柱2の周面に仮設シヤープレート15を溶接し、それに対して作業床ユニット1における大梁11のウェブを添え板16を介して仮締結する。その作業床ユニット1を降下させる際には、ボルトを抜去して仮締結を解除し、下階に溶接した他の仮設シヤープレート15に対して同様に仮締結すれば良い。なお、仮設シヤープレート15は最終的に撤去すれば良いが、支障がなければそのまま残置しても良い。   FIG. 5 shows a structure for joining the work floor unit 1 and the main beam 4 to the structural pillar 2. In installing the work floor unit 1 so that it can be lowered to each span during construction, a temporary shear plate 15 is welded to the peripheral surface of the structural pillar 2, and the web of the large beam 11 in the work floor unit 1 is attached thereto. 16 is temporarily tightened. When the work floor unit 1 is lowered, the bolts are removed to release the temporary fastening, and the temporary floor plate 15 welded to the lower floor may be temporarily fastened in the same manner. The temporary shear plate 15 may be finally removed, but may be left as it is if there is no problem.

また、本設の大梁4を構真柱2間に架設するに当たっては、構真柱2の周面にシヤープレート20と上下の外ダイヤフラム21からなる本設ブラケット22を溶接し、それに対して大梁4のウェブを添え板23を介してボルト締結(HTBによる2面摩擦接合)するとともに上下フランジを現場溶接することにより剛接合する。   Further, when the main beam 4 is installed between the structural pillars 2, a main bracket 22 composed of a shear plate 20 and upper and lower outer diaphragms 21 is welded to the peripheral surface of the structural column 2, and the large beams are attached thereto. 4 webs are fastened with bolts (two-surface friction joining by HTB) via the splicing plate 23, and the upper and lower flanges are rigidly joined by field welding.

さらに、作業床ユニット1を最終的に地下2階の本設の床梁構造体5として設置するに当たっては、構真柱2の周面に上記の仮設シヤープレート15に代えて上記の本設ブラケット22を溶接し、それに対して他の大梁4と同様に作業床ユニット1の大梁11のウェブを添え板23を介してボルト締結するとともに上下フランジを現場溶接することにより剛接合する。なお、作業床ユニット1の大梁11が架設されない外周スパンには、図3に破線で示すように大梁4(4c)を適宜架設する。   Further, when the work floor unit 1 is finally installed as the main floor beam structure 5 on the second basement floor, the permanent bracket 2 is replaced with the permanent bracket 15 instead of the temporary shear plate 15. 22 is welded, and the web of the large beam 11 of the work floor unit 1 is bolted through the attachment plate 23 and the upper and lower flanges are welded to the upper and lower flanges in the same manner as the other large beams 4. In addition, a large beam 4 (4c) is appropriately installed as shown by a broken line in FIG.

以上の逆打ち工法によれば、作業床ユニット1を足場とすることで地下階の躯体工事および掘削工事を錯綜することなく効率的に実施でき、しかも作業床ユニット1を最終的に本設の床梁構造体5としてそのまま利用するのでそれを解体して撤去する必要がなく、地下工事に係わる工期短縮と工費削減を図ることができる。   According to the reverse striking method described above, the work floor unit 1 can be used as a scaffold, so that the work and excavation work on the underground floor can be carried out efficiently, and the work floor unit 1 is finally installed in the main building. Since it is used as the floor beam structure 5 as it is, it is not necessary to dismantle it and remove it, and it is possible to shorten the construction period and the construction cost related to the underground construction.

特に、作業床ユニット1を各スパンに設置するので個々の作業床ユニット1を小形軽量のものとできるし、それを地表部において容易に組み立てることができ、また工事進捗に応じて個々の作業床ユニット1をそれぞれ最適なタイミングで独立に降下させることができ、その降下作業もチェーンブロックやウインチ等の簡易な揚重手段により施工済みの大梁4から吊り支持しつつ容易にかつ速やかに行うことができるので、大がかりな仮設ステージを用いる場合に較べて遙かに作業性に優れる。なお、隣接するスパンに設置する作業床ユニット1どうしを連結して、複数スパンの作業床ユニットを一括して同時に降下させるようにしても良い。   In particular, since the work floor unit 1 is installed in each span, each work floor unit 1 can be made small and light, and can be easily assembled on the ground surface, and each work floor can be adjusted according to the construction progress. Each unit 1 can be lowered independently at the optimum timing, and the descent work can be easily and promptly performed while being suspended and supported from the installed large beam 4 by simple lifting means such as a chain block or winch. As a result, the workability is much better than when a large temporary stage is used. Note that the work floor units 1 installed in adjacent spans may be connected to each other so that the work floor units of a plurality of spans can be lowered simultaneously.

また、作業床ユニット1を大梁11と小梁12とデッキ13とにより構成することにより充分に軽量なものとできるばかりでなく、それをそのまま本設の床梁構造体5として利用してその上部にコンクリートを打設することのみで直ちに床を形成することができる。しかも、各作業床ユニット1を全体として市松配置することにより、最外周部の一部の大梁4cを除いてほぼ全ての大梁4として作業床ユニット1の大梁11をそのまま利用することができる。   Moreover, not only can the work floor unit 1 be composed of the large beam 11, the small beam 12 and the deck 13, but it can be made sufficiently light, and it can be used as it is as the main floor beam structure 5 and its upper part. A floor can be immediately formed only by placing concrete on the floor. Moreover, by arranging the respective work floor units 1 as a checkerboard as a whole, the large beams 11 of the work floor unit 1 can be used as they are as almost all of the large beams 4 except for some of the large beams 4c at the outermost periphery.

また、施工中に作業床ユニット1を設置する際には仮設シヤープレート15に対して大梁11のウェブのみをボルト締結することで着脱を容易に行えるし、構真柱2の建て込み施工誤差を添え板16により吸収することもできる。そして、作業床ユニット1を本設の床梁構造体5として架設する際には仮設シヤープレート15に代えて本設ブラケット22に対して2面摩擦接合によるボルト締結と現場溶接とを併用して接合することにより、本設の躯体として支障なく確実強固に剛接合することができる。勿論、各階の本来の大梁4も同様の本設ブラケット22を介して構真柱2に対して支障なく剛接合することができる。   Further, when installing the work floor unit 1 during construction, it is possible to easily attach and detach the web of the large beam 11 to the temporary shear plate 15 by bolting, and the construction work error of the construction pillar 2 is reduced. It can also be absorbed by the attachment plate 16. When the work floor unit 1 is installed as the permanent floor beam structure 5, bolt fastening by two-surface friction bonding and field welding are used in combination with the main bracket 22 instead of the temporary shear plate 15. By joining, the main frame can be securely and firmly joined without hindrance. Of course, the original girder 4 on each floor can be rigidly joined to the structural pillar 2 via the similar main bracket 22 without any trouble.

さらに、上記のように作業床ユニット1の下面側にホイストクレーン等の搬送手段を設置することで、作業床ユニット1の下方地盤の掘削作業等を効率的に実施することができる。勿論、施工の進捗に伴って搬送手段の設置位置や搬送経路を自由に変更することもできるし、必要であれば搬送手段のみならず各種の施工機械や資機材を作業床ユニット1に組み込んだり作業床ユニット上に搭載することもできる。   Furthermore, by installing the conveying means such as a hoist crane on the lower surface side of the work floor unit 1 as described above, excavation work and the like of the lower ground of the work floor unit 1 can be performed efficiently. Of course, as the construction progresses, the installation position and the conveyance route of the conveyance means can be freely changed, and if necessary, not only the conveyance means but also various construction machines and materials can be incorporated into the work floor unit 1. It can also be mounted on a work floor unit.

以上で本発明の一実施形態を説明したが、本発明は上記実施形態に限定されるものでは勿論なく、たとえば以下に列挙するように様々な変形や応用が可能である。   Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications and applications are possible as listed below, for example.

構真柱杭3や構真柱2の構造は任意であって、たとえば構真柱杭3として鋼管杭を採用し、それをそのまま上方に延長して構真柱2を鋼管柱により構成することでも良い。勿論、構真柱2としては角形あるいは円形断面のCFT柱や鋼管柱に限らず、H形鋼や十字形断面等の鉄骨柱であっても良い。各階に架設する本来の大梁4や、作業床ユニット1を構成する大梁11についてもH形鋼に限るものではない。   The structure of the structural pillar pile 3 or the structural pillar 2 is arbitrary. For example, a steel pipe pile is adopted as the structural pillar pile 3 and is extended upward as it is to constitute the structural pillar 2 with a steel pipe column. But it ’s okay. Of course, the structural column 2 is not limited to a CFT column or a steel tube column having a square or circular cross section, but may be a steel column such as an H-shaped steel or a cross-shaped cross section. The original girder 4 installed on each floor and the girder 11 constituting the work floor unit 1 are not limited to H-section steel.

上記実施形態のように作業床ユニット1を大梁11と小梁12とデッキ13により構成してそれを市松配置することが好ましいが、それに限るものでもなく、作業床ユニット1は施工中に順次降下させていくことができ最終的に本設の床梁構造体5として架設できる限りにおいてその構造や設置の形態は任意であり、たとえば重量的には不利とはなるが大梁11や小梁12としてプレキャスト梁を採用したり、デッキ13上に予めコンクリートを打設してスラブを形成しておくことでも良い。   It is preferable that the work floor unit 1 is composed of the large beams 11, the small beams 12 and the deck 13 as in the above embodiment, and is arranged in a checkered pattern. However, the present invention is not limited to this. As long as the floor beam structure 5 can be finally built, the structure and the form of installation are arbitrary. For example, although it is disadvantageous in terms of weight, as the large beam 11 and the small beam 12 A precast beam may be employed, or concrete may be placed on the deck 13 in advance to form a slab.

構真柱2に対して大梁11や大梁4を接合するための構造は上記のような仮設シヤープレート15や本設ブラケット22によることが好ましいが、それに限るものでもなく、適宜の構造で接合すれば良い。また、仮設シヤープレート15や本設ブラケット22を用いる場合においても、それらを構真柱2に対して溶接するタイミングは適宜であり、可能であればそれらを予め取り付けた状態で構真柱2を施工することでも良い。   The structure for joining the large beam 11 and the large beam 4 to the true pillar 2 is preferably the temporary shear plate 15 or the main bracket 22 as described above, but is not limited thereto, and the structure can be joined with an appropriate structure. It ’s fine. Even when the temporary shear plate 15 or the main bracket 22 is used, the timing for welding them to the construction column 2 is appropriate, and if possible, the construction column 2 can be mounted in a state in which they are attached in advance. It may be constructed.

上記実施形態は地下3階までの施工への適用例であるので、作業床ユニット1を最終的には地下2階の床梁構造体5として利用することとしたが、地下4階以下に適用する場合には上記工程を階数に応じて繰り返せば良く、いずれにしても最終的に作業床ユニット1を最下階の直上階の床梁構造体5として利用すれば良い。   Since the above embodiment is an application example for construction up to the third basement floor, the work floor unit 1 is finally used as the floor beam structure 5 on the second basement floor. In this case, the above steps may be repeated according to the number of floors, and in any case, the work floor unit 1 may be finally used as the floor beam structure 5 on the lowermost floor.

本発明の実施形態である逆打ち工法の工程を示す図である。It is a figure which shows the process of the reverse driving method which is embodiment of this invention. 同、次の工程を示す図である。It is a figure which shows the next process same as the above. 同、作業床ユニットの配置状況を示す図である。It is a figure which shows the arrangement | positioning condition of a work floor unit. 同、作業床ユニットの構成を示す図である。It is a figure which shows the structure of a work floor unit same as the above. 同、構真柱に対する作業床ユニットおよび大梁の接合構造を示す図である。It is a figure which shows the joining structure of the work floor unit with respect to a construction pillar, and a big beam.

符号の説明Explanation of symbols

1 作業床ユニット
2 構真柱
3 構真柱杭
4(4a,4b,4c) 大梁(躯体)
5 床梁構造体
6 基礎
11 大梁
12 小梁
13 デッキ
14 敷鉄板
15 仮設シヤープレート
16 添え板
20 シヤープレート
21 外ダイヤフラム
22 本設ブラケット
23 添え板
1 Work floor unit 2 True pillar 3 True pillar pile 4 (4a, 4b, 4c) Large beam (frame)
5 Floor beam structure 6 Foundation 11 Large beam 12 Small beam 13 Deck 14 Laying iron plate 15 Temporary shear plate 16 Attached plate 20 Shear plate 21 Outer diaphragm 22 Attached bracket 23 Attached plate

Claims (4)

建物の地下部を施工するための逆打ち工法であって、
地表部から地盤中に構真柱杭および構真柱を施工した後、地盤表層部を掘削して構真柱の上端部を露出せしめ、4本の構真柱により囲まれる各スパンにそれぞれ作業床ユニットを降下可能に設置し、
それら作業床ユニットを足場として躯体を施工するとともに各作業床ユニットの下方地盤を掘削し、1階層分の掘削を行ったら各作業床ユニットを施工済みの躯体から吊り支持して1階層分降下させて再び各スパンに降下可能に設置し、
上記工程を繰り返して最下階の直上の階までの掘削が完了した時点で各作業床ユニットをその階の本設の床梁構造体として各スパンに設置するとともに、その下方地盤をさらに掘削して最下階の躯体および基礎を施工することを特徴とする逆打ち工法。
It is a reverse striking method for constructing the underground part of a building,
After constructing the structural pillar pile and the structural pillar in the ground from the surface, excavate the surface layer of the ground to expose the upper end of the structural pillar and work on each span surrounded by the four structural pillars. Install the floor unit so that it can descend,
Using these work floor units as scaffolding, construct the chassis, excavate the lower ground of each work floor unit, and after excavating one level, suspend and support each work floor unit from the installed structure and lower it by one level. And install again in each span so that it can be lowered.
When the above steps are repeated and excavation up to the floor directly above the lowest floor is completed, each work floor unit is installed in each span as a main floor beam structure on that floor, and the lower ground is further excavated. The reverse striking method characterized by constructing the lowermost frame and foundation.
請求項1記載の逆打ち工法において、
各スパンに設置する作業床ユニットを、施工中は構真柱に対して仮締結され最終的には本設として構真柱間に架設される一方向の一対2本の大梁と、それら大梁間に架設された小梁と、それら大梁および小梁上に敷設されたデッキとにより構成し、
かつそれら作業床ユニットを隣接するスパンに設置するに当たっては、双方の作業床ユニットにおける大梁が互いに直交方向となるように配置して双方の大梁を同一構真柱の互いに直交する周面に対してそれぞれ仮締結することを特徴とする逆打ち工法。
In the reverse driving method according to claim 1,
The work floor units installed in each span are temporarily fastened to the structural pillars during construction, and are finally installed as a main construction with a pair of two large beams in one direction and the space between these large beams. It is composed of a small beam erected on and a deck laid on the large beam and the small beam,
And when installing these work floor units in adjacent spans, arrange the large beams in both work floor units so that they are perpendicular to each other, and place both large beams on the mutually perpendicular circumferential surfaces of the same construction column. Reverse hammering method characterized by temporary fastening.
請求項2記載の逆打ち工法において、
構真柱としてコンクリート充填鋼管柱を採用するとともに、作業床ユニットを構成する大梁および各階に架設する本設の大梁としていずれもH形鋼を採用し、
施工中において作業床ユニットを各スパンに設置するに当たっては、構真柱の周面に溶接した仮設シヤープレートに対して作業床ユニットにおける大梁のウェブを添え板を介して仮締結し、
本設の大梁を構真柱間に架設するに当たっては、構真柱の周面に溶接したシヤープレートと外ダイヤフラムからなる本設ブラケットに対して大梁のウェブを添え板を介してボルト締結するとともに上下フランジを溶接することにより剛接合し、
作業床ユニットを最終的に本設の床梁構造体として設置するに当たっては、構真柱の周面に前記仮設シヤープレートに代えて溶接した前記本設ブラケットに対して大梁のウェブを添え板を介してボルト締結するとともに上下フランジを溶接することにより剛接合することを特徴とする逆打ち工法。
In the reverse driving method according to claim 2,
A concrete-filled steel pipe column is used as the structural pillar, and H beams are used as the main beams that make up the work floor unit and the main beams installed on each floor.
When installing the work floor unit in each span during construction, the web of the work floor unit is temporarily fastened to the temporary shear plate welded to the peripheral surface of the structural pillar through an attachment plate,
In installing the main beam between the structural pillars, the web of the main beam is bolted to the main bracket consisting of a shear plate welded to the peripheral surface of the structural column and an outer diaphragm via an attachment plate. Rigidly joined by welding the upper and lower flanges,
When the work floor unit is finally installed as a main floor beam structure, a large beam web is attached to the main bracket which is welded in place of the temporary shear plate on the peripheral surface of the structural pillar. A reverse driving method characterized in that it is fastened by bolting and rigidly joined by welding the upper and lower flanges.
請求項1,2または3記載の逆打ち工法において、
作業床ユニットの下面側に各種資機材や掘削土を搬送するための搬送手段を設置し、作業床ユニットの下方地盤の掘削作業や基礎の施工をその搬送手段を用いて行うことを特徴とする逆打ち工法。
In the reverse driving method according to claim 1, 2, or 3,
A transport means for transporting various materials and excavation soil is installed on the lower surface side of the work floor unit, and excavation work and foundation construction of the lower ground of the work floor unit are performed using the transport means. Reverse hammering method.
JP2004269935A 2004-09-16 2004-09-16 Reverse strike method Expired - Fee Related JP4362824B2 (en)

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CN102493487A (en) * 2011-12-13 2012-06-13 上海市第一建筑有限公司 Method for constructing foundation slab embedded with concrete supports
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JP2015121049A (en) * 2013-12-24 2015-07-02 大成建設株式会社 Inverted lining method
CN105297773A (en) * 2015-10-30 2016-02-03 马鞍山十七冶工程科技有限责任公司 Reverse construction method earth excavation method capable of reducing cover-excavation earth volume
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CN113502852A (en) * 2021-07-07 2021-10-15 中铁一局集团(广州)建设工程有限公司 Subway station cover excavation top-down construction structure and construction method thereof
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CN102493487A (en) * 2011-12-13 2012-06-13 上海市第一建筑有限公司 Method for constructing foundation slab embedded with concrete supports
CN102493487B (en) * 2011-12-13 2014-02-26 上海建工一建集团有限公司 Method for constructing foundation slab embedded with concrete supports
JP2015121049A (en) * 2013-12-24 2015-07-02 大成建設株式会社 Inverted lining method
CN103938634A (en) * 2014-03-22 2014-07-23 王继远 Deep foundation pit supporting structure and construction method
CN103938634B (en) * 2014-03-22 2017-06-16 王继远 A kind of deep foundation pit supporting structure and construction method
CN105297773A (en) * 2015-10-30 2016-02-03 马鞍山十七冶工程科技有限责任公司 Reverse construction method earth excavation method capable of reducing cover-excavation earth volume
CN107542108A (en) * 2016-12-22 2018-01-05 深圳建业工程集团股份有限公司 A kind of reverse construction method of building basement structure
CN107542108B (en) * 2016-12-22 2019-11-22 深圳建业工程集团股份有限公司 A kind of reverse construction method of building basement structure
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