JP2012117209A - Caisson method and equipment for caisson method - Google Patents

Caisson method and equipment for caisson method Download PDF

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JP2012117209A
JP2012117209A JP2010265027A JP2010265027A JP2012117209A JP 2012117209 A JP2012117209 A JP 2012117209A JP 2010265027 A JP2010265027 A JP 2010265027A JP 2010265027 A JP2010265027 A JP 2010265027A JP 2012117209 A JP2012117209 A JP 2012117209A
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basement
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JP4942230B1 (en
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Kenji Machisuji
賢治 町筋
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Abstract

PROBLEM TO BE SOLVED: To provide a caisson method capable of constructing an underground building on the ground and constructing a ground part in parallel with a basement part, and equipment for the caisson method.SOLUTION: The caisson method includes: a process of respectively erecting underground piled columns 3 composed by freely removably connecting a plurality of underground piled column nodes in an axial direction on cast-in-place piles 2; a process of constructing a basement part 51 on the ground; a process of installing jacks 4 between the upper ends of the respective underground piled columns 3 and a building 5, extending the jacks 4 and supporting the building 5; an excavation process of excavating the lower soil of the basement part 51; a settling process of simultaneously contracting the respective jacks 4 and settling the building 5; and an underground piled column node removal process of successively removing the underground piled column node whose order is predetermined among the uppermost underground piled column nodes of the respective underground piled columns 3 while supporting the building by the respective jacks 4 not corresponding to the underground piled column node. In parallel to the excavation process, the settling process and the underground piled column node removal process are alternately repeated until the basement part 51 of the building 5 is settled.

Description

この発明は、地盤を掘り下げて設けた掘削空間に建築物の地階部分を沈設するための潜函工法及びその潜函工法用の設備に関する。   The present invention relates to a submerged method for sinking a basement portion of a building in an excavation space provided by digging down the ground and equipment for the submerged method.

従来、地下建築物の施工のために地盤を掘削する場合、外部の土砂や地下水の流入を防止するため、掘削する領域の外周に土留め壁が設けられている。土留め壁の内側には、外部の土圧に抗して土留め壁を支えるために、腹起こしや切梁等の支保工を設ける必要がある。しかし、支保工の設置、解体に工期、工費が必要となるばかりでなく、地下建築物を施工する際に、支保工自体が障害となることも多い。   Conventionally, when excavating the ground for construction of an underground building, a retaining wall is provided on the outer periphery of the area to be excavated to prevent inflow of external earth and sand and groundwater. In order to support the retaining wall against the external earth pressure, it is necessary to provide a support structure such as a belly upright or a cutting beam inside the retaining wall. However, not only the construction period and construction cost are required for the installation and dismantling of the support works, but also the support work itself often becomes an obstacle when constructing the underground building.

そこで、支保工を省略して、各階の床構造により土留め壁を支持する逆打ち工法が施工されている（例えば、特開２００２−０６１２１３号公報参照）。
この逆打ち工法では、図１０に示すように、まず、土留め壁Ａ１で囲まれた地中に現場打ち杭Ａ２を打設するとともに、現場打ち杭Ａ２上に構真柱Ａ３を立設する。次に、土留め壁Ａ１で囲まれた地盤を掘削して設けた空間内に、構真柱Ａ３を支柱として地上１階部分の床構造Ａ４を構築する。この床構造Ａ４が土留め壁Ａ１を支える支保工の働きをする。そして、さらに地盤の掘削を行って、地下１階部分の床構造Ａ５、外壁Ａ５１及び地下柱Ａ５２を構築する。こうして、地盤の掘削と各階躯体の構築を繰り返し、最下層に地下耐圧版Ａ６を設けて地階部分の構築を完了する。
この逆打ち工法においては、構真柱Ａ３に地上部分の柱を接続することができるため、地階部分の構築と並行して、地上部分（図示は省略）の構築を進めることができ、工期を短縮できるというメリットも大きい。 In view of this, there has been a reverse driving method in which support work is omitted and the retaining wall is supported by the floor structure of each floor (see, for example, JP-A-2002-061213).
In this reverse driving method, as shown in FIG. 10, first, the on-site pile A2 is placed in the ground surrounded by the retaining wall A1, and the frame pillar A3 is erected on the on-site pile A2. . Next, in the space provided by excavating the ground surrounded by the retaining wall A1, the floor structure A4 of the first floor is constructed using the construction pillar A3 as a support column. This floor structure A4 functions as a support for supporting the earth retaining wall A1. Then, the ground is further excavated to construct the floor structure A5, the outer wall A51, and the underground pillar A52 of the first basement. Thus, the excavation of the ground and the construction of each floor frame are repeated, and the underground pressure plate A6 is provided in the lowermost layer to complete the construction of the basement part.
In this reverse striking method, since the pillar of the ground part can be connected to the structural pillar A3, the construction of the ground part (not shown) can be advanced in parallel with the construction of the basement part, The merit of being able to shorten is also great.

しかし、逆打ち工法においては、地階部分の施工を地下で進めるために生じる不都合が有る。例えば、既設のコンクリート部材の下面側に新設のコンクリート部材を打ち継ぐため、打ち継ぎ部に空隙が生じ易く、漏水防止のためエポキシ樹脂等を充填して空隙を塞ぐ必要がある。また、地下では外防水が困難であり、地下外壁の内面に防水層を設けるため、この防水層と耐圧版下の防水層との連結が困難である。   However, in the reverse driving method, there is an inconvenience that occurs because the construction of the basement part proceeds in the basement. For example, since a new concrete member is handed over to the lower surface side of an existing concrete member, a gap is likely to be generated in the joint portion, and it is necessary to fill the gap with an epoxy resin or the like to prevent water leakage. In addition, it is difficult to waterproof outside in the basement, and since a waterproof layer is provided on the inner surface of the underground outer wall, it is difficult to connect the waterproof layer and the waterproof layer under the pressure plate.

そこで、地上で地下建築物を構築したのち地下へ沈下させることが考えられる。このような工法としては、オープンケーソン工法や、ニューマチックケーソン工法等の潜函工法が提案されている（特開２００２−００４２９６号公報、特開２０１０−１５０８１８号公報参照）。   Therefore, it is conceivable to construct an underground building on the ground and then sink to the basement. As such a construction method, an open caisson method and a submerged method such as a pneumatic caisson method have been proposed (see JP 2002-004296 A and JP 2010-150818 A).

特開２００２−０６１２１３号公報JP 2002-061213 A 特開２００２−００４２９６号公報JP 2002-004296 A 特開２０１０−１５０８１８号公報JP 2010-150818 A

しかし、前記提案の潜函工法では、建築物の沈下が建築物の自重や圧入により行われるため、地盤の過掘削等で建築物が傾く等、建築物の姿勢が安定せず、建築物の地階部分を施工しながら上の階の施工を行うことは困難であり、建設工期に日数を要してしまう。
本発明は、上記課題に鑑みてなされたものであり、地上において地階部分を建造することで、地階部分を地下で建造することによる不都合を解消できるとともに、地上部分を地階部分の沈設と並行して施工可能にして建設工期を短縮可能な潜函工法及び潜函工法用設備の提供を目的とする。 However, in the proposed submerged method, the settlement of the building is performed by the weight of the building or press-fitting of the building, and the posture of the building is not stable, such as the building is tilted due to overexcavation of the ground, etc. It is difficult to construct the upper floor while constructing the part, and it takes days for the construction period.
The present invention has been made in view of the above problems, and by constructing the basement part on the ground, the inconvenience caused by the basement part being built underground can be solved, and the ground part is parallel to the subsidence of the basement part. The purpose is to provide a submersible method and equipment for a submerged method that can be constructed and shorten the construction period.

上記課題を解決するためになされた発明は、地盤を掘り下げながら建築物の地階部分を沈下させる潜函工法であって、地中に設けられる複数の現場打ち杭上に、軸方向に複数の構真柱節を取脱自在に連結してなる構真柱をそれぞれ立設する構真柱立設工程と、前記各構真柱の最上位に位置する構真柱節の上端と前記地階部分を地上で建造した建築物との間に、前記各構真柱節の軸方向長さ以上のストローク長を備えたジャッキを設置し、前記ジャッキを伸長して前記建築物を支持するジャッキ設置工程と、前記地階部分の下部地盤を掘削する掘削工程と、前記各ジャッキを同時に収縮して前記建築物を沈下させる沈下工程と、前記各構真柱の最上位の構真柱節のうちの予め順序が定められた構真柱節を、その構真柱節とは非対応の各ジャッキにより前記建築物を支持しながら、その順序に従って、順に取脱する構真柱節取脱工程とを有し、前記掘削工程と並行して、前記沈下工程と、前記構真柱節取脱工程とを前記建築物の地階部分が沈設されるまで交互に繰り返すことを特徴とする。   The invention made to solve the above problems is a submerged construction method that sinks the basement portion of a building while digging the ground, and a plurality of constructions in the axial direction on a plurality of on-site piles provided in the ground. A construction column erecting process for erecting a construction column by detachably connecting the column sections, and the upper end of the construction column section located at the top of each construction column and the basement portion on the ground. A jack installation step for supporting the building by extending the jack and installing a jack having a stroke length equal to or longer than the axial length of each of the structural pillars between the building constructed in The excavation step of excavating the lower ground of the basement portion, the subsidence step of simultaneously shrinking the jacks to sink the building, and the pre-order of the top column pillars of the column columns Each jack that is not compatible with the specified pillar And supporting the building, and in accordance with the order of the construction, it has a structure column removal process, and in parallel with the excavation process, the subsidence process and the structure column removal process Are alternately repeated until the basement portion of the building is sunk.

本発明に係る潜函工法においては、地中に設けられる複数の現場打ち杭上に構真柱を立設するため、構真柱の沈下や傾倒を抑制でき、建築物を潜函する各工程において建築物の姿勢を安定させることができる。
また、構真柱が軸方向に複数の構真柱節を取脱自在に連結してなり、構真柱節の軸方向長さ以上のストローク長を備えるジャッキを構真柱上端と建築物の間に設置することにより、構真柱節を取脱した後、取脱した構真柱節に代わって、このジャッキを伸長することで建築物の支持を行うことができる。各構真柱の最上位の構真柱節のうちの予め順序が定められた構真柱節を、その構真柱節とは非対応の各ジャッキにより構造建築物を支持しながら、その順序に従って、順に取脱するため、構真柱節の取脱を行う間も建築物の姿勢を安定させることができる。全ジャッキを同時に収縮して建築物の沈下を行うため、建築物の姿勢を実質的に傾けることなく建築物を沈下させることができる。掘削工程と並行して、沈下工程及び構真柱節取脱工程を繰り返すことにより、建築物の沈下を少しずつ行うことができるため、建築物に加える振動を抑制し、建築物の姿勢を安定させた状態で建築物の沈下を行うことができる。
このように、各工程において建築物の姿勢を安定させることができるため、地階部分の施工と並行して地上部分の施工を行うことができる。 In the submersion method according to the present invention, since the construction pillar is erected on a plurality of site-placed piles installed in the ground, the settlement and tilting of the construction pillar can be suppressed, and in each process of submerging the building, The posture of the object can be stabilized.
In addition, a structural pillar is connected to a plurality of structural pillars in an axial direction so that the structural pillars are detachable, and a jack having a stroke length longer than the axial length of the structural pillars is connected to the top of the structural pillar and the building. By installing it in between, it is possible to support the building by extending this jack instead of the removed true pillar after removing the true pillar. The order of the structural pillars of the highest order of each structural pillar is determined while supporting the structural building with each jack not corresponding to the structural pillars. Therefore, it is possible to stabilize the posture of the building even during the removal of the structural pillar. Since all the jacks are contracted simultaneously to sink the building, the building can sink without substantially tilting the posture of the building. In parallel with the excavation process, the subsidence process and the structural column removal and removal process can be repeated to subsidize the building little by little. Therefore, vibration applied to the building is suppressed, and the posture of the building is stabilized. In this state, the building can be subsidized.
Thus, since the posture of the building can be stabilized in each process, the construction of the ground portion can be performed in parallel with the construction of the basement portion.

また、本発明に係る潜函工法においては、地上において地階部分を建造することにより、各階躯体（最下層の柱を除く）の打設において、従来の逆打ち工法とは違いコンクリートを上から流し込むことができ、地階部分の各階の躯体を一体的に打設することができるため、柱と梁の間等に空隙が生じることを抑制でき、また、地下外壁に外防水を施すことができる。   Also, in the submerged method according to the present invention, by constructing the basement part on the ground, concrete is poured from above in the placement of each floor frame (excluding the lowermost column) unlike the conventional reverse casting method. Since the frame of each floor of the basement portion can be driven integrally, it is possible to suppress the generation of voids between the pillars and the beams, and to provide external waterproofing to the underground outer wall.

本発明の潜函工法は、前記建築物の地階部分の外壁の下端に、地盤に貫入する刃口を備えているとともに、前記外壁の外面に防水板を備えていることが好ましい。外壁の下端に地盤に貫入する刃口を備えることにより、周囲から土砂や地下水が、外壁下端をくぐって室内側へ流入することを抑制できる。また、外壁の外面に防水板を設けることにより、地階部分の防水性を格段に向上することができる。そして、地階部分がこのような刃口と防水板とを備えることにより、この外壁を土留め壁として用いることができる。
従って、土留め壁を省略できるため、土留め壁を構築、解体する工期、工費を節約できる。また、土留め壁のスペースだけ建築物の床面積を拡充することができ、建築物の外壁を隣接する構造物や道路との境界に近接して建築物の地階部分を建造することができる。 The submersion method according to the present invention preferably includes a blade opening penetrating into the ground at the lower end of the outer wall of the basement portion of the building, and a waterproof plate on the outer surface of the outer wall. By providing the cutting edge that penetrates the ground at the lower end of the outer wall, it is possible to suppress earth and sand and groundwater from flowing from the surroundings to the indoor side through the lower end of the outer wall. Moreover, the waterproofness of a basement part can be improved significantly by providing a waterproof board in the outer surface of an outer wall. And the outer wall can be used as a retaining wall by providing the basement portion with such a blade and a waterproof plate.
Therefore, since the retaining wall can be omitted, the construction period and construction cost for constructing and dismantling the retaining wall can be saved. Further, the floor area of the building can be expanded by the space of the retaining wall, and the basement portion of the building can be constructed by bringing the outer wall of the building close to the boundary with the adjacent structure or road.

本発明は、地盤を掘り下げながら建築物の地階部分を沈下させる際に用いられる潜函工法用設備であって、地中に設けられる複数の現場打ち杭と、前記複数の現場打ち杭上にそれぞれ立設され、軸方向に複数の構真柱節を取脱自在に連結してなる構真柱と、前記構真柱節の軸方向長さ以上のストローク長を有し、前記各構真柱の最上位に位置する構真柱節の上端と前記地階部分を地上で建築した建築物との間にそれぞれ設置されて、前記最上位に位置する構真柱節を予め定められた順序に従って取脱する際には前記建築物を支持するように、前記建築物を沈下させる際には同時に収縮するように構成されたジャッキとを備えることを特徴とする潜函工法用設備を含む。   The present invention is a submerged construction method equipment used for sinking a basement portion of a building while digging down the ground, and a plurality of on-site piles provided in the ground, and standing on each of the plurality of on-site piles. A built-up column that is detachably connected in the axial direction, and has a stroke length that is longer than the axial length of the built-up column, It is installed between the upper end of the top pillar and the building where the basement is built on the ground, and the top pillar is removed according to a predetermined order. And a jack configured to shrink to support the building at the same time, and to shrink at the same time when the building sinks.

本発明に係る潜函工法用設備は、地中に設けられる現場打ち杭と、その上に立設される構真柱を備えることにより、建築物を沈下させる間も、建築物を安定に支持することができる。また、軸方向に複数の構真柱節を取脱自在に連結してなる構真柱と、前記構真柱節の軸方向長さ以上のストローク長を有し、前記各構真柱の最上位に位置する構真柱節の上端と前記地階部分を地上で建築した建築物との間にそれぞれ設置されて、前記最上位に位置する構真柱節を予め定められた順序に従って取脱する際には前記建築物を支持するように、前記建築物を沈下させる際には、同時に収縮するように構成されたジャッキとを備えることにより、ジャッキで支持しながら構真柱を１段ずつ取脱しては、ジャッキを収縮して建築物を沈下させることができるため、建築物の姿勢を徐々に安定して沈下させることができる。従って、本発明の潜函工法用設備は、建築物の地階部分を地下へ沈下させる潜函工法に円滑に用いることができる。   The equipment for a submerged construction method according to the present invention includes a site-casting pile provided in the ground and a structural pillar that is erected on the pile, thereby stably supporting the building even while the building is being submerged. be able to. In addition, it has a structural column formed by detachably connecting a plurality of structural column nodes in the axial direction, and has a stroke length that is equal to or longer than the axial direction length of the structural column node. It is installed between the upper end of the upper structure pillar and the building where the basement is built on the ground, and the uppermost structure pillar is removed according to a predetermined order. In order to support the building at the time, when sinking the building, it is provided with a jack configured to shrink at the same time, so that the pillars can be taken step by step while being supported by the jack. Since the building can be sunk by shrinking the jack, the posture of the building can be gradually and stably sunk. Therefore, the equipment for a submerged construction method of the present invention can be smoothly used for a submerged construction method for sinking a basement portion of a building to the basement.

ここで、「同時に」とは、実質的に同時であることをいい、建築物の姿勢を制御するために、各ジャッキにおいて、収縮を開始、停止若しくは終了するタイミング又は収縮するスピードが多少異なる場合も含む概念とする。また、「最上位の構真柱節」とは、繰り返し行われる構真柱節取脱工程の各回において最上位に位置する構真柱節をいい、ｎ回目の構真柱節取脱工程においては、工事開始当初の構真柱の上からｎ段目の構真柱節を指すものとする。   Here, “simultaneously” means substantially simultaneously, and in order to control the posture of the building, the timing at which contraction starts, stops or ends or the contraction speed differs slightly in each jack. The concept also includes In addition, the “topmost timber column” means a timber column located at the top in each round of the pedestal column removal / removal process that is repeatedly performed. Refers to the n-stage frame pillar from the top of the beam.

本発明の潜函工法及び潜函工法用設備によれば、地上において建築物の地階部分を施工することで、建築物の地階部分を地下で建造することによる不都合を解消できるとともに、建築物の姿勢を安定に保ちながら建築物の地階部分を潜函できるため、地階部分の施工と並行して地上部分の施工を行うことができ、建築工期を短縮することができる。   According to the diving method and the equipment for the diving method of the present invention, by constructing the basement part of the building on the ground, it is possible to eliminate the inconvenience caused by building the basement part of the building underground, and to change the attitude of the building. Since the basement part of the building can be hidden while maintaining stability, the ground part can be constructed in parallel with the construction of the basement part, and the construction period can be shortened.

本発明の第１実施形態に係る潜函工法の流れ図である。It is a flowchart of the submersible construction method concerning a 1st embodiment of the present invention. 図１に示した潜函工法の各工程を示す説明図である。It is explanatory drawing which shows each process of the submersible construction method shown in FIG. （ａ）は、図１の潜函工法に用いる構真柱の側面図である。（ｂ）は（ａ）の構真柱を形成する第１の構真柱節の正面図である。（ｃ）は（ｂ）の構真柱節の側面図である。（ｄ）は（ａ）の構真柱を形成する第２の構真柱節の正面図である。（ｅ）は（ｄ）の構真柱節の側面図である。（ｆ）は（ａ）の構真柱を形成する第３の構真柱節の正面図である。（ｇ）は（ｆ）の構真柱節の側面図である。(A) is a side view of a structural pillar used for the submersible construction method of FIG. (B) is a front view of the 1st true pillar section which forms the true pillar of (a). (C) is a side view of the true pillar of (b). (D) is a front view of the second true pillar section forming the true pillar of (a). (E) is a side view of the true pillar of (d). (F) is a front view of the 3rd true pillar column which forms the true pillar of (a). (G) is a side view of the stem pillar of (f). 図１の潜函工法において建造される地階部分の外壁下部の断面図である。It is sectional drawing of the outer wall lower part of the basement part built in the submersible construction method of FIG. 図４の外壁下部の接合部を示す模式的断面図である。It is typical sectional drawing which shows the junction part of the outer wall lower part of FIG. 図１の潜函工法において建造される建築物の地階部分の模式的断面図である。It is typical sectional drawing of the basement part of the building constructed in the submersible construction method of FIG. 図１の潜函工法において、構真柱節の取脱順序の一例を示した説明図である。FIG. 2 is an explanatory view showing an example of a removal order of a timber pillar in the submerged construction method of FIG. 1. 本発明の第２実施形態に係る潜函工法の流れ図である。It is a flowchart of the submersible construction method concerning a 2nd embodiment of the present invention. 図２の潜函工法の施工の様子を示す説明図である。It is explanatory drawing which shows the mode of construction of the submersible construction method of FIG. 従来の逆打ち工法の手順を示した説明図である。It is explanatory drawing which showed the procedure of the conventional reverse driving method.

（第１実施形態）
以下、適宜図面を参照しながら本発明の第１実施形態である潜函工法及び潜函工法用設備について詳述する。本実施形態に係る潜函工法用設備１は、現場打ち杭２、構真柱３、ジャッキ４を備える。 (First embodiment)
Hereinafter, the submerged method and the equipment for the submerged method that are the first embodiment of the present invention will be described in detail with reference to the drawings as appropriate. The submerged construction method equipment 1 according to the present embodiment includes an in-situ pile 2, a structural pillar 3, and a jack 4.

現場打ち杭２は、アースドリル工法又はオールケーシング工法により形成する。アースドリル工法では、予めドリルで掘削したボーリング孔２１の底部に円筒状の鉄筋籠を挿入し、これにコンクリートを打設して現場打ち杭２を形成する。オールケーシング工法では地中にケーシングパイプを圧入して内部の土を掘削し、ケーシングパイプ内部に鉄筋籠を挿入し、コンクリートを打設した後、ケーシングパイプを抜いて、現場打ち杭２を形成する。また他の公知の方法により、現場打ち杭２を形成してもよい。   The on-site pile 2 is formed by an earth drill method or an all casing method. In the earth drill method, a cylindrical reinforcing bar is inserted into the bottom of a boring hole 21 drilled in advance, and concrete is placed on this to form the in-situ pile 2. In the all casing method, a casing pipe is press-fitted into the ground to excavate the internal soil, a reinforcing bar is inserted into the casing pipe, concrete is placed, and then the casing pipe is pulled out to form the in-situ pile 2. Further, the in-situ pile 2 may be formed by other known methods.

構真柱３は、図３（ａ）に示すように建築物５を沈下させながら順に取脱する第１の構真柱節３１（以下単に「構真柱節３１」ともいう）と、耐圧版６に埋設する第２の構真柱節３２（以下単に「構真柱節３２」ともいう）と、現場打ち杭２中に埋設する第３の構真柱節３３（以下単に「構真柱節３３」ともいう）とを備える。上から構真柱節３１を複数本、その下に連続して構真柱節３２を１本、さらにその下に連続して構真柱節３３を１本連結して、構真柱３を形成する。構真柱節３１を連結する本数は、構真柱節３１の軸方向の長さａや地階部分の階高等を勘案して適宜決定する。   As shown in FIG. 3A, the structural pillar 3 includes a first structural pillar section 31 (hereinafter also simply referred to as “structural pillar section 31”) that is sequentially removed while the building 5 is being sunk, A second structural pillar section 32 (hereinafter simply referred to as “structural pillar section 32”) embedded in the plate 6 and a third structural pillar section 33 (hereinafter simply referred to as “structural structure”) embedded in the cast-in-place pile 2. It is also referred to as “post section 33”. From the top, there are a plurality of structural pillars 31, one continuous structural pillar 32 is connected underneath, and one continuous structural pillar 33 is connected continuously below it. Form. The number of connecting the true pillars 31 is appropriately determined in consideration of the axial length a of the true pillars 31 and the height of the basement.

図３の（ｂ）から（ｇ）に示すように、各構真柱節３１、３２、３３は円筒部分３１ａ、３２ａ、３３ａの両端又は一端にボルト孔３１ｃ、３２ｃ、３３ｃ付きのフランジ３１ｂ、３２ｂ、３３ｂを備え、各構真柱節３１、３２、３３は、このフランジを介してボルト・ナットにより連結される。フランジ３１ｂ、３２ｂ、３３ｂの背面と円筒部分３１ａ、３２ａ、３３ａ外周面との間には、略直角二等辺三角形の鋼板製リブ３１ｄ、３２ｄ、３３ｄが等角度間隔で溶接されている。構真柱節３３は、現場打ち杭２との間で十分な結合強度を確保するため、外周部にスタッドジベル３３ｅが多数溶接されている。各構真柱節３１、３２、３３の各部の寸法、リブ３１ｄ、３２ｄ、３３ｄ及びスタッドジベル３３ｅの数は必要とされる強度に応じて適宜決定される。各構真柱節３１、３２、３３の各部の材料としては、鋼材を好適に用いることができる他、必要とされる強度や耐久性を備えるものであれば、公知のものを適宜用いることができる。   As shown in (b) to (g) of FIG. 3, each of the true pillars 31, 32, 33 has flanges 31 b with bolt holes 31 c, 32 c, 33 c at both ends or one end of the cylindrical portions 31 a, 32 a, 33 a, 32b and 33b, and each of the structural pillar sections 31, 32 and 33 are connected by bolts and nuts via the flanges. Between the rear surfaces of the flanges 31b, 32b, and 33b and the outer peripheral surfaces of the cylindrical portions 31a, 32a, and 33a, steel plate ribs 31d, 32d, and 33d having substantially right-angled isosceles triangles are welded at equal angular intervals. In order to secure a sufficient bonding strength between the structural pillar section 33 and the in-situ pile 2, a large number of stud gibels 33 e are welded to the outer peripheral portion. The size of each part of each of the true pillar sections 31, 32, 33, the number of ribs 31d, 32d, 33d and the number of stud gibber 33e are appropriately determined according to the required strength. As a material of each part of each structural pillar section 31, 32, 33, a steel material can be suitably used, and a known material can be appropriately used as long as it has required strength and durability. it can.

ジャッキ４は、建造物５から各構真柱３に伝達される荷重を考慮して構真柱ごとに十分な強度を有するものが用いられる。ジャッキ４としては、ピストン式やラム式の油圧式ジャッキを用いることができる他、建築物５を支えること可能なだけの揚力及び耐荷重性を備えるものであれば、他の公知のジャッキを用いてもよい。   As the jack 4, a jack 4 having sufficient strength for each frame is used in consideration of a load transmitted from the building 5 to each frame 3. As the jack 4, a piston-type or ram-type hydraulic jack can be used, and other known jacks can be used as long as they have lift and load resistance capable of supporting the building 5. May be.

本実施形態の潜函工法は、図１に示すように、構真柱立設工程Ｓ１、地階部分建造工程Ｓ２、ジャッキ設置工程Ｓ３、掘削工程Ｓ４、沈下工程Ｓ５、地階部分の沈設が完了したかどうかを判断する工程Ｓ６、構真柱節取脱工程Ｓ７及び最下層躯体完成工程Ｓ８を有する。   As shown in FIG. 1, the submerged construction method of the present embodiment is the construction of the pillar pillar erection step S1, the basement partial construction step S2, the jack installation step S3, the excavation step S4, the subsidence step S5, and the basement subsidence. It includes a process S6 for determining whether or not, a column post-removal process S7 and a lowermost frame completion process S8.

（構真柱立設工程Ｓ１）
まず、本発明の潜函工法では、構真柱立設工程Ｓ１において、現場打ち杭２及び構真柱３を設ける。図２に示すように、現場打ち杭２及び構真柱３は、地階部分５１の最下層の柱８を打設する位置に設ける。 (Structure pillar standing process S1)
First, in the submerged construction method of the present invention, the on-site pile 2 and the construction pillar 3 are provided in the construction pillar standing step S1. As shown in FIG. 2, the in-situ pile 2 and the structural pillar 3 are provided at a position where the lowermost pillar 8 of the basement portion 51 is to be placed.

構真柱３の立設方法には、現場打ち杭のコンクリートを打設する前に構真柱を立設する「先建て工法」、現場打ち杭のコンクリートを打設した後に構真柱を立設する「後建て工法」の他、公知の立設方法を適宜用いることができる。このうち、打設するコンクリートで構真柱３が汚れたり、構真柱３の位置ずれや変形を起こすことが少ない「後達て工法」が好ましい。「後達て工法」により現場打ち杭２を設ける場合は、コンクリートを打設した後に、クレーン等で吊り下げてボーリング孔２１へ挿入し、吊り下げたままの状態で高さ及び傾きを調整しながら立設する。この際、構真柱３は、垂直精度が１／５００以上１／３００以下となるように立設されることが好ましい。構真柱３の垂直精度がこの範囲であれば、建築物５の姿勢をより安定して沈下させることができる。構真柱３の垂直精度の測定には、トランシットや傾斜計など公知の方法を用いることができる。構真柱節３を立設した後、ボーリング孔２１は、周壁の崩落を防止するため、土砂で埋め戻される。   The standing pillar 3 is erected by the “advanced construction method” where the concrete pillar is erected before placing the concrete of the cast-in-place pile, and the concrete pillar is erected after placing the concrete of the cast-in-place pile. In addition to the “post-built method” to be set, a known standing method can be used as appropriate. Among these, the “advanced construction method” is preferable, in which the structural pillar 3 is not soiled by the cast concrete and the positional displacement or deformation of the structural pillar 3 is less likely to occur. When installing the cast-in-place pile 2 by “advanced construction method”, after placing the concrete, suspend it with a crane or the like and insert it into the boring hole 21 and adjust the height and inclination in the suspended state. While standing up. At this time, it is preferable that the structural pillar 3 is erected so that the vertical accuracy is 1/500 or more and 1/300 or less. If the vertical accuracy of the structural pillar 3 is within this range, the posture of the building 5 can be more stably sunk. A known method such as transit or inclinometer can be used to measure the vertical accuracy of the structural pillar 3. After the upright column 3 is erected, the boring hole 21 is backfilled with earth and sand to prevent the peripheral wall from collapsing.

このように、本発明の潜函工法では、現場打ち杭２を設置して、その上に構真柱３を立設するため、構真柱３の沈下や傾倒を防止して構真柱３の姿勢を安定させ、ひいては、建築物５の姿勢を安定して沈設することができる。   As described above, in the submerged method according to the present invention, the cast-in-place pile 2 is installed and the construction pillar 3 is erected thereon, so that the construction pillar 3 is prevented from sinking or tilting and The posture can be stabilized, and consequently the posture of the building 5 can be stably set.

（地階部分建造工程Ｓ２）
構真柱３を立設した後、地上において建築物５の地階部分５１を建造する。本発明の潜函工法では、地上において地階部分５１を建造できるため、地下で建造する場合に比べて制約が少なく、各種の工法を適宜用いることができ、工費、工期を大幅に収縮することができる。また、地階部分を地下で施工することによる不都合を解消することができる。 (Basement partial construction process S2)
After erecting the true pillar 3, the basement part 51 of the building 5 is constructed on the ground. In the submerged construction method of the present invention, since the basement portion 51 can be constructed on the ground, there are fewer restrictions than when constructed underground, and various construction methods can be used as appropriate, and the construction cost and construction period can be significantly reduced. . Moreover, the inconvenience by constructing the basement part underground can be eliminated.

図４に示すように、本実施形態では、地階部分５１の外壁５２の外側部分には、ハーフＰＣ版５３を用いる。ハーフＰＣ版５３の外面には、予め工場にて防水板５４が貼設される。詳細には、防水版５４は、内面にスタッド５４ａを備えており、防水版５４を仮枠としてコンクリートを打設することにより、ハーフＰＣ版５３外面に防水版５４を貼設する。図５に示すように、ハーフＰＣ版５３の端面５３ａには、傾斜が設けられており、ハーフＰＣ版５３どうしを連結すると、接合部の内面側がＶ字溝となるように構成されている。防水版５４は、周辺部が折り曲げられて、ハーフＰＣ版５３の端面５３ａまでを被覆している。このＶ字溝には、内側からシール材が圧入され、接合部の水密性が確保される。
外壁５２の室内側部分５２ａは、現場において配筋された後、コンクリートを打設して形成される。防水板５４としては、亜鉛引き鉄板やステンレス鋼薄板等の摩擦に強いものを用いる。また、充分な耐摩擦性を有するものであれば、塩ビ鋼板やフッ素樹脂鋼板等の公知の防水板を適宜用いることができる。尚、防水版５４のスタッド５４ａの代わりに、防水版５４を折り曲げ加工して設けたリブ等を代用してもよい。 As shown in FIG. 4, in this embodiment, a half PC plate 53 is used for the outer portion of the outer wall 52 of the basement portion 51. On the outer surface of the half-PC plate 53, a waterproof plate 54 is pasted in advance at the factory. Specifically, the waterproof plate 54 includes a stud 54 a on the inner surface, and the waterproof plate 54 is attached to the outer surface of the half PC plate 53 by placing concrete with the waterproof plate 54 as a temporary frame. As shown in FIG. 5, the end surface 53a of the half PC plate 53 is provided with an inclination, and when the half PC plates 53 are connected to each other, the inner surface side of the joint portion is formed as a V-shaped groove. The waterproof plate 54 is bent at the periphery to cover the end surface 53 a of the half PC plate 53. A sealing material is press-fitted into the V-shaped groove from the inside, and the water tightness of the joint is ensured.
The indoor side portion 52a of the outer wall 52 is formed by placing concrete after being placed on site. As the waterproof plate 54, a material resistant to friction such as a galvanized iron plate or a stainless steel thin plate is used. Moreover, if it has sufficient abrasion resistance, well-known waterproof boards, such as a vinyl chloride steel plate and a fluororesin steel plate, can be used suitably. Instead of the stud 54a of the waterproof plate 54, a rib or the like provided by bending the waterproof plate 54 may be substituted.

このように、本発明の潜函工法では、地上で地階部分を建造するため、外壁に防水板を設けることが容易である。また。摩擦に強い防水板を用いることにより、地階部分を沈下させる際に、掘削した地盤の側壁との摩擦により防水板が損傷して防水機能を損なうことを抑制できる。   Thus, in the submerged construction method of the present invention, since the basement part is constructed on the ground, it is easy to provide a waterproof plate on the outer wall. Also. By using a waterproof plate that is resistant to friction, it is possible to prevent the waterproof plate from being damaged due to friction with the side wall of the excavated ground and damaging the waterproof function when the basement is subsidized.

図４に示すように、外壁５２下部は、室内側においてテーパー状の段差部５２ｂが設けられ、この段差部の上側より下側の壁厚が薄くなるよう形成される。外壁５２下端には、刃口５５が設けられる。刃口５５は、断面内側角部にテーパー部分５５ａが設けられ下端が尖るように形成される。刃口５５がこのような断面形状に形成されることにより、外壁下部の地盤を室内側から掘削することが容易となる。また、外周から外壁下端をくぐって地下水混じりの土砂等が室内側へ侵入するような場合には、この土砂中に刃口を貫入させて、土砂や地下水が侵入することを抑制することができる。ここで、段差部５２ｂの上端から刃口５５下端までの長さＬは、事前のボーリング調査により得られた建設地周辺の地質データーに応じて適宜定められる。長さＬが地質に応じた充分な長さを備えることにより、外部から土砂や地下水が侵入するヒービングをより適切に防ぐことができる。   As shown in FIG. 4, the lower portion of the outer wall 52 is provided with a tapered stepped portion 52b on the indoor side, and is formed so that the wall thickness below the upper side of the stepped portion is thinner. A blade edge 55 is provided at the lower end of the outer wall 52. The blade edge 55 is formed such that a tapered portion 55a is provided at the inner corner of the cross section and the lower end is pointed. By forming the blade edge 55 in such a cross-sectional shape, it becomes easy to excavate the ground below the outer wall from the indoor side. In addition, when earth and sand mixed with groundwater enters the indoor side through the lower end of the outer wall from the outer periphery, it is possible to suppress the intrusion of earth and sand or groundwater by penetrating the blade into the earth and sand. . Here, the length L from the upper end of the stepped portion 52b to the lower end of the blade edge 55 is appropriately determined according to the geological data around the construction site obtained by the preliminary boring survey. By providing the length L with a sufficient length according to the geology, heaving in which earth and sand or groundwater enters from the outside can be prevented more appropriately.

刃口５５表面を包むようにして、断面略「Ｊ」の字状の刃口用防水板５６が冠着される。詳細には、刃口防水版５６を仮枠の一部として、外壁５２の室内側部分５２ａが打設される。刃口防水板５６の下端部は、刃口５５の室内側から下端を包むように外側かつ上側に折り返されて、防水板５４の下端部と水密に連結される。刃口防水板５６の内側上端部は、外壁５２内面に垂直に立ち上げられた鍔部５７を備えている。鍔部５７は直角三角形状のリブ５８にて補強される。刃口防水板５６は、鍔部５７により、後述する耐圧版６内部の防水層６１と水密に連結される。このように、外壁５２外面の防水板５４、刃口防水板５６、耐圧版６内部の防水層６１が水密に連結されることにより、地階部分５１の防水性を格段に向上させることができる。刃口防水版５６は、鉄板を加工した後、亜鉛メッキ処理を施して形成する他、充分な強度を有するものであれば、上述した防水板５４に用いる材料を適宜用いて形成することができる。   A blade-mouth waterproof board 56 having a substantially “J” cross section is attached so as to wrap the surface of the blade edge 55. Specifically, the indoor side portion 52a of the outer wall 52 is driven with the blade-edge waterproof plate 56 as a part of the temporary frame. The lower end portion of the blade opening waterproof plate 56 is folded outward and upward so as to wrap the lower end from the indoor side of the blade opening 55 and is watertightly connected to the lower end portion of the waterproof plate 54. An inner upper end portion of the blade waterproofing plate 56 includes a flange portion 57 that rises perpendicularly to the inner surface of the outer wall 52. The flange portion 57 is reinforced by a right-angled triangular rib 58. The blade opening waterproof plate 56 is watertightly connected to a waterproof layer 61 in the pressure plate 6 described later by a flange portion 57. Thus, the waterproofness of the basement part 51 can be remarkably improved by watertightly connecting the waterproof plate 54 on the outer surface of the outer wall 52, the blade waterproof plate 56, and the waterproof layer 61 inside the pressure plate 6. The blade edge waterproof plate 56 can be formed by appropriately using the material used for the waterproof plate 54 as long as it has sufficient strength in addition to being formed by galvanizing after the iron plate is processed. .

上述したように、地下外壁５２の防水板５４が十分な耐摩擦性を備え、外壁５２が外壁下部からの土砂や地下水の侵入を防ぐ刃口５５を備え、外壁５２及び刃口５５が十分な防水性を備えることにより、外壁５２を土留め壁として用いることができる。   As described above, the waterproof plate 54 of the underground outer wall 52 has sufficient friction resistance, the outer wall 52 includes the blade edge 55 that prevents intrusion of earth and sand and groundwater from the lower portion of the outer wall, and the outer wall 52 and the blade edge 55 are sufficient. By providing waterproofness, the outer wall 52 can be used as a retaining wall.

また、外壁５２は、図４に示すように、内側部分５２ａに高圧洗浄用給水配管５９を備えることが好ましい。高圧洗浄用給水配管５９は、内側部分５２ａを現場で打設する際に埋設される。高圧洗浄用給水配管５９の先端は、刃口５５のテーパー部分５５ａから突出するよう設けられており、高圧噴射ノズル５９ａを備えている。この高圧噴射ノズル５９ａから高圧水を噴射することにより、地盤が固くて掘削困難な場合であっても、地盤の掘削を容易に行うことができる。   Moreover, as shown in FIG. 4, the outer wall 52 is preferably provided with a high-pressure cleaning water supply pipe 59 in the inner portion 52a. The high-pressure cleaning water supply pipe 59 is embedded when the inner portion 52a is driven on site. The tip of the high-pressure cleaning water supply pipe 59 is provided so as to protrude from the tapered portion 55a of the blade edge 55, and includes a high-pressure spray nozzle 59a. By jetting high-pressure water from the high-pressure jet nozzle 59a, the ground can be easily excavated even when the ground is hard and difficult to excavate.

尚、地階部分建造工程Ｓ２は、地上で施工する必要のある工程が終了し地階部分５１を沈下させる準備が整うまでの工程をいい、内装の仕上げ等、地階部分５１を完成するために必要な全ての工程を含むものではない。   The basement partial construction process S2 is a process from completion of a process that needs to be performed on the ground to preparation for sinking the basement part 51, and is necessary for completing the basement part 51 such as finishing of the interior. It does not include all processes.

（ジャッキ設置工程Ｓ３）
地階部分建造工程Ｓ２の完了後、ジャッキ設置工程Ｓ３では、構真柱３の最上位に位置する構真柱節３１と建築物５の間にジャッキ４を設置する。詳細には、最下層の梁９の下面において柱８が打ち継がれる位置に設けられる被支持部９ａとこの最上位の構真柱節３１の上端との間に、ピストン４１の伸縮方向を鉛直にしてジャッキ４を設置する。ジャッキ４はピストン４１側を下にして設置され、被支持部９ａに固定される。ジャッキ４を設置した後、ピストン４１の先端が最上位の構真柱節３１の上端面に当接するまでジャッキを伸長する。ジャッキ４を最大まで伸長してもピストン４１の先端が最上位の構真柱節３１に当接しない場合は、ジャッキ４と被支持部９ａとの間に調整アジャスター４２を挟みこんでもよい。このとき、最上位の構真柱節３１と、ピストン４１とはボルト・ナットにより仮固定してもよい。ジャッキ４（及び調整アジャスター４２）を設置した後、全ジャッキ４を伸長し、全ジャッキ４に建築物５の荷重を均等に伝達して、建築物５を正しい姿勢に保つよう支持する。 (Jack installation process S3)
After the completion of the basement partial construction process S2, in the jack installation process S3, the jack 4 is installed between the building pillar 31 located at the top of the building pillar 3 and the building 5. More specifically, the expansion and contraction direction of the piston 41 is set vertically between the supported portion 9a provided at the position where the column 8 is succeeded on the lower surface of the lowermost beam 9 and the upper end of the uppermost columnar column 31. The jack 4 is installed. The jack 4 is installed with the piston 41 side down, and is fixed to the supported portion 9a. After the jack 4 is installed, the jack is extended until the tip of the piston 41 comes into contact with the upper end surface of the uppermost structure column 31. If the tip of the piston 41 does not come into contact with the uppermost columnar column 31 even when the jack 4 is extended to the maximum, an adjustment adjuster 42 may be sandwiched between the jack 4 and the supported portion 9a. At this time, the uppermost structure column 31 and the piston 41 may be temporarily fixed by bolts and nuts. After the jacks 4 (and the adjustment adjusters 42) are installed, all the jacks 4 are extended, and the load of the building 5 is evenly transmitted to all the jacks 4 to support the building 5 in a correct posture.

（掘削工程Ｓ４）
掘削工程Ｓ４は、ジャッキ４で建築物５を支持した状態で行われる。刃口５５の直下の地盤を、少なくとも構真柱節３１の軸方向長さａだけ掘削する。ただし、土質により、建築物５が自重で自沈する場合は、刃口５５の直下の地盤の掘削は省略することができる。また、外壁で囲まれた部分の地盤の掘削は、他の工程と並行して適宜行うことができる。外壁で囲まれた部分の地盤の掘削は、ヒービングを回避するために、できるだけ掘削する時期を遅くして室内側の土圧を確保しながら行うことが好ましい。
地盤の掘削は重機や自動掘削機による方法の他、公知の方法を適宜用いることができる。 (Drilling process S4)
Excavation process S4 is performed in the state which supported the building 5 with the jack 4. FIG. The ground immediately below the blade edge 55 is excavated at least by the axial length a of the stem column 31. However, when the building 5 is self-settled by its own weight, the excavation of the ground immediately below the blade edge 55 can be omitted. Further, excavation of the ground surrounded by the outer wall can be appropriately performed in parallel with other processes. The excavation of the ground surrounded by the outer wall is preferably performed while ensuring the earth pressure on the indoor side by delaying the excavation time as much as possible in order to avoid heaving.
For excavation of the ground, known methods can be used as appropriate in addition to methods using heavy machinery or automatic excavators.

（沈下工程Ｓ５）
本実施形態においては、沈下工程Ｓ５は、掘削工程Ｓ４完了後に行われる。沈下工程Ｓ５では、全ジャッキ４のピストン４１を構真柱節３１の軸方向長さａだけ同時に収縮して、建築物５を沈下させる。ここで、建築物５の姿勢はコンピュータにより制御される。即ち、本実施形態に係る潜函工法用設備１は感知手段４３と、コンピュータによる制御手段４４とを備えており（感知手段４３及び制御手段４４は図示せず）、感知手段４３によりジャッキ４の鉛直方向の変位を感知し、この感知された変位の情報を制御手段４３に伝達する。この情報により制御手段４３は、建築物５の姿勢を把握し、各ジャッキ４にピストン４１の伸長又は収縮を指示して建築物５の姿勢を制御する。このように、建築物５の姿勢をコンピュータ制御することで、建築物５の姿勢を安定して沈下させることができる。 (Subsidence process S5)
In the present embodiment, the settlement step S5 is performed after the excavation step S4 is completed. In the settlement step S <b> 5, the pistons 41 of all the jacks 4 are simultaneously contracted by the axial length “a” of the stem column 31 to sink the building 5. Here, the posture of the building 5 is controlled by a computer. That is, the submersible construction equipment 1 according to the present embodiment includes a sensing means 43 and a computer control means 44 (the sensing means 43 and the control means 44 are not shown). A displacement in the direction is sensed, and information on the sensed displacement is transmitted to the control means 43. Based on this information, the control means 43 grasps the posture of the building 5 and instructs each jack 4 to extend or contract the piston 41 to control the posture of the building 5. Thus, by controlling the posture of the building 5 by computer, the posture of the building 5 can be stably sunk.

尚、地階部分５１の建造は、沈下工程Ｓ５と一部並行して行うこともできる。例えば、地階部分５１が多層階有る場合、最下階のみを建造したのち、その上の地階部分は最下階の沈下と並行して建造することができる。こうすることで、地階部分を建造する工期、工費を縮小することができる。   In addition, construction of the basement part 51 can also be performed in parallel with the settlement process S5. For example, when the basement portion 51 has a multi-layered floor, after only the bottom floor is constructed, the basement portion above it can be constructed in parallel with the settlement of the bottom floor. By carrying out like this, the construction period and construction cost which build a basement part can be reduced.

（沈設の完了を判断する工程Ｓ６）
Ｓ６においては、地階部分５１の沈設が完了したかどうかを判断する。地階部分５１の沈設が最終深度まで完了していない場合には、後述する構真柱節取脱工程Ｓ７に進む。地階部分５１の沈設が完了している場合には、後述する最下層躯体完成工程Ｓ８に進む。 (Step S6 for judging the completion of the installation)
In S6, it is determined whether or not the basement portion 51 has been installed. When the setting of the basement portion 51 has not been completed to the final depth, the process proceeds to a structural pillar node removal step S7 described later. When the setting of the basement portion 51 is completed, the process proceeds to the lowermost frame completion process S8 described later.

（構真柱節取脱工程Ｓ７）
構真柱節取脱工程Ｓ７では、全構真柱３の最上位の構真柱節３１を順に取脱する。図２に示すように、最上位の構真柱節３１を取脱した後、この構真柱３上のジャッキ４を、このジャッキ４のピストン４１の先端面がその下の構真柱節３１に当接するまで伸長し、建築物５の荷重をこのジャッキ４に伝達させる。 (Structure pillar removal and removal process S7)
In the true pillar section removal step S7, the uppermost true pillar section 31 of all the true pillars 3 is removed in order. As shown in FIG. 2, after removing the uppermost true column 31, the jack 4 on the true post 3 is connected to the end of the piston 41 of the jack 4. The load of the building 5 is transmitted to the jack 4.

ここで、ジャッキ４としては、ストローク長が、構真柱節３１の軸方向長さａ以上ものが用いられる。この長さのジャッキ４を用いることにより、構真柱節取脱工程Ｓ７において構真柱節３１を取脱した後、伸長したジャッキ４により構真柱節３１に代わって建築物５を支持することができる。また、構真柱節３１の軸方向長さａとジャッキ４のストローク長とはできるだけ差の小さいことが好ましい。この差を少なくすることで、構真柱節３１の本数を少なくできるため、掘削工程Ｓ４、沈下工程Ｓ５、構真柱節取脱工程Ｓ７を繰り返す回数を減らして工期を短縮することができる。   Here, as the jack 4, a jack whose stroke length is equal to or greater than the axial length a of the stem column 31 is used. By using the jack 4 of this length, after removing the true pillar 31 in the true pillar setting / removing step S7, the extended jack 4 supports the building 5 in place of the true pillar 31. be able to. Further, it is preferable that the difference between the axial length “a” of the true column 31 and the stroke length of the jack 4 is as small as possible. By reducing this difference, the number of structural pillars 31 can be reduced, so that the number of repetitions of the excavation step S4, the settlement step S5, and the structural pillar node removal step S7 can be reduced and the construction period can be shortened.

構真柱節３１の取脱は、予め定められた順序に基づいて行われる。この順序は、建築物５から各構真柱３に伝達される荷重を勘案して定められる。図７は、１６本の構真柱が、平面視で略正方形の外周及び内部に４行×４列にて配置されている場合に、構真柱節３１を取脱する順序を示している。図中同じ記号を付した構真柱３は、実質的に同時に最上位の構真柱節３１を取脱する。図中各行を下からＡ行、Ｂ行、Ｃ行、Ｄ行とし、各列を左から１列，２列，３列，４列とすると、まず、四隅に位置するＡ行１列（以下「Ａ−１」のようにいう）、Ｄ−１、Ａ−４及びＤ−４の構真柱３から最上位の構真柱節３１を取脱する。ここで、例えば、Ｄ−１の構真柱節３１取脱する作業の間は、他の１５本の構真柱３上のジャッキにより建築物５を支持する。次に、Ａ−２及びＤ−２に位置する構真柱３の最上位構真柱節３１を取脱した後、前記４本のジャッキ４と同様に、この２本の構真柱３上のジャッキ４を伸長する。以下、Ａ−３及びＤ−３、Ｃ−１及びＣ−４、Ｂ−１及びＢ−４、Ｃ−２、Ｃ−３、Ｂ−２、Ｂ−３の順に前記同様に構真柱節３１を取脱しては、ジャッキ４を伸長する作業を繰り返す。
こうして、１６本全ての構真柱３について、最上位の構真柱節３１の取脱が完了することにより、構真柱節取脱工程Ｓ７が１回分完了する。 Removal of the true pillar 31 is performed based on a predetermined order. This order is determined in consideration of the load transmitted from the building 5 to each construction pillar 3. FIG. 7 shows the order of removing the true column section 31 when the 16 true pillars are arranged in 4 rows × 4 columns on the outer periphery and inside of a substantially square in plan view. . In the figure, the structural pillar 3 with the same symbol removes the top structural pillar section 31 at substantially the same time. In the figure, if each row is A row, B row, C row, and D row from the bottom, and each column is 1 column, 2 columns, 3 columns, and 4 columns from the left, first, A row and 1 column (hereinafter referred to as the four corners) The uppermost structural column section 31 is removed from the structural column 3 of D-1, A-4, and D-4. Here, for example, during the work of removing the D-1 frame column 31, the building 5 is supported by the jacks on the other 15 frame columns 3. Next, after removing the uppermost structural column 31 of the structural column 3 located at A-2 and D-2, like the four jacks 4 above the two structural columns 3 The jack 4 is extended. In the following, A-3 and D-3, C-1 and C-4, B-1 and B-4, C-2, C-3, B-2, and B-3 in the same order as described above. After removing 31, the operation of extending the jack 4 is repeated.
In this way, the removal of the highest structural column 31 for all 16 structural columns 3 is completed, so that the structural column removal / removal step S7 is completed once.

尚、構真柱３（及び現場打ち杭２）の配置は前記の４行×４行の配置に限られず、地階部分５１の最下層の柱８の配置に一致するよう配置したものであればいかなる配置であってもよく、構真柱節取脱工程Ｓ７において構真柱節３１を取脱する順序は、その配置に応じて適宜定めることができる。   In addition, the arrangement of the structural pillar 3 (and on-site pile 2) is not limited to the above arrangement of 4 rows × 4 rows, as long as it is arranged so as to coincide with the arrangement of the lowermost column 8 of the basement portion 51. Any arrangement may be employed, and the order of removing the true pillar section 31 in the true pillar section removing step S7 can be appropriately determined according to the arrangement.

図１に示すように、構真柱立設工程Ｓ１から構真柱節取脱工程Ｓ７までを１回施工した後、地階部分５１が最終の深度に沈設されるまで、掘削工程Ｓ４、沈下工程Ｓ５、沈設の完了を判断する工程Ｓ６、構真柱節取脱工程Ｓ７を繰り返す。ただし、最終回は、構真柱節取脱工程Ｓ７は行われず、沈下工程Ｓ５からＳ６を経て、最下層躯体完成工程Ｓ８に移行する。   As shown in FIG. 1, the excavation process S4, the subsidence process until the basement portion 51 is submerged to the final depth after the construction from the structural pillar erection process S1 to the structural pillar removal and removal process S7 is performed once. S5, the process S6 for determining the completion of the staking, and the structural column post-removing process S7 are repeated. However, in the final round, the structural pillar column removing step S7 is not performed, and the process proceeds from the sinking steps S5 to S6 to the lowermost frame completion step S8.

このように、構真柱節３１を最上位から１本ずつ取脱しながら掘削工程Ｓ４、沈下工程Ｓ５及び構真柱節取脱工程Ｓ７を繰り返すことで、建築物５を構真柱節３１の軸方向長さａずつ、徐々に沈下させることができるため、建築物５に加える振動を抑制して、建築物５の姿勢を安定させた状態で建築物５の沈下を行うことができる。従って、地階部分５１の施工に並行して、地上部分（図示せず）の施工を行うことができる。また、徐々に、地盤の掘削を行うことができ、その後すぐに、外壁５２を沈下させて土留めを行うことができるため、周辺の土砂の崩壊を抑制することができる。   In this way, by repeating the excavation process S4, the settlement process S5 and the structural pillar section removal process S7 while removing the structural pillar sections 31 one by one from the top, the building 5 is replaced by the structural pillar section 31. Since the axial length a can be gradually subsided, the vibration applied to the building 5 can be suppressed and the building 5 can be subsidized in a state where the posture of the building 5 is stabilized. Therefore, the ground part (not shown) can be constructed in parallel with the construction of the basement part 51. Moreover, since the ground can be gradually excavated, and immediately after that, the outer wall 52 can be sunk and earth retaining can be performed, so that the collapse of the surrounding earth and sand can be suppressed.

（最下層躯体完成工程Ｓ８）
最下層躯体完成工程Ｓ８は、地階部分５１が最終の深度に沈設された後施工される。最下層躯体完成工程Ｓ８においては、耐圧版６及び最下層階の柱８が打設される。 (Lowermost layer housing completion process S8)
The lowermost frame completion process S8 is performed after the basement portion 51 is sunk to the final depth. In the lowermost frame completion step S8, the pressure-resistant plate 6 and the pillar 8 on the lowermost floor are placed.

詳細には、まず、外壁５２で囲まれた地盤表面に栗割石と目つぶし砂利を敷設して栗割石層６２を形成する。栗割石層６２の上には、捨てコンクリート層６３を打設する。捨てコンクリート層６３の上に防水層６１を敷設する。防水層６１としては、アスファルトや樹脂等を固化して設けるものの他、耐圧版下に設けられる公知の防水板を適宜用いることができる。防水層６１の端部は、刃口防水板５６の鍔部５７の上面にまで敷設されるため、刃口防水板５６と防水層６１とを水密に連結することができる。次に、防水層６１の上から防水板押えモルタル６４を塗工する。そして、その上に配筋を行って耐圧版６を打設する。このとき、第２の構真柱節３２が、頭部分を残して耐圧版６に埋設される。   Specifically, first, the chestnut crushed stone layer 62 is formed by laying crushed stone and crushed gravel on the ground surface surrounded by the outer wall 52. A discarded concrete layer 63 is placed on the chestnut quarry stone layer 62. A waterproof layer 61 is laid on the discarded concrete layer 63. As the waterproof layer 61, a well-known waterproof board provided under a pressure plate can be used as appropriate in addition to a solidified asphalt or resin. Since the edge part of the waterproof layer 61 is laid down to the upper surface of the collar part 57 of the blade edge waterproof board 56, the blade edge waterproof board 56 and the waterproof layer 61 can be watertightly connected. Next, the waterproof board pressing mortar 64 is applied from above the waterproof layer 61. Then, the pressure-resistant plate 6 is placed by placing a bar on it. At this time, the second structural pillar 32 is embedded in the pressure-resistant plate 6 leaving the head portion.

このように、本発明の潜函工法によれば、建築物５の地階部分５１に十分な防水施工を施すことができるため、図１０（ｃ)に示すような、従来、地下外壁の室内側に設けられていた漏水用の排水溝Ａ７を省略することができ、排水溝Ａ７を隠すために設けられていた内壁Ａ８を省略して外壁を一重にすることができるため、地階部分の床面積を拡充することができる。また、耐圧版６に通常設けられる漏水用の集水ピットＡ９を省略して、図６に示すように雑排水ピット６５、汚水ピット６６を耐圧版６の中央に配置すれば、耐圧版６の周囲部分は、集水ピットＡ９のスペースだけ耐圧版６を底上げして、地盤の掘削量を削減することができる。   Thus, according to the submersible construction method of the present invention, since sufficient waterproof construction can be applied to the basement portion 51 of the building 5, conventionally, as shown in FIG. The drainage groove A7 for water leakage that has been provided can be omitted, and the inner wall A8 that has been provided to conceal the drainage groove A7 can be omitted so that the outer wall can be made a single layer. Can be expanded. Further, if the water collecting pit A9 usually provided in the pressure plate 6 is omitted and the miscellaneous drainage pit 65 and the sewage pit 66 are arranged at the center of the pressure plate 6 as shown in FIG. In the surrounding area, the pressure-resistant plate 6 can be raised by the space of the water collecting pit A9 to reduce the excavation amount of the ground.

耐圧版６を打設した後、ジャッキ４と残っている構真柱節３１を取脱する。このように、第１の構真柱節３１は、最下層躯体完成工程Ｓ８が完了するまでに、全て取脱して回収することができ、次回以降の工事で再利用することが可能である。構真柱節３１を取脱した箇所には、配筋を行って最下層の柱８を打設する。このとき、柱８に耐圧版６から突出している構真柱節３２の頭部分を埋殺する。   After placing the pressure-resistant plate 6, the jack 4 and the remaining structural pillar 31 are removed. In this way, all the first structural pillars 31 can be removed and collected before the lowermost frame completion step S8 is completed, and can be reused in the next and subsequent constructions. At the location where the true column section 31 is removed, reinforcement is placed and the lowermost column 8 is placed. At this time, the head portion of the true pillar section 32 protruding from the pressure plate 6 is buried in the column 8.

本発明の潜函工法においては、上述した地階部分の建造や沈設と並行して、地上部分の建造を行うことができる。地上部分の建造は、少なくとも最下層の沈設を開始した後、始めることが好ましい。こうすることで地階部分５１の周囲の地盤により、地階部分５１の躯体が拘束されるため、建築物５の横揺れを抑制することができる。   In the submersible construction method of the present invention, the ground portion can be constructed in parallel with the construction and subsidence of the basement portion described above. The construction of the ground part is preferably started after at least the lowest layer has been set up. By doing so, since the frame of the basement portion 51 is restrained by the ground around the basement portion 51, the rolling of the building 5 can be suppressed.

以上説明したように、本実施形態の潜函工法では、土留め壁を必要としないため、土留め壁のスペースだけ隣接する構造物や道路に近接して建築物の地階部分を建造することができ、地階部分の床面積を拡充することができる。また、土留め壁を構築、解体するための工期、工費を節約することができる。さらに、建築物の姿勢を安定して沈下させることができるため、地階部分の施工と並行して地上部分の施工を行うことができ、建築工期を短縮することができる。   As described above, the submersion method according to the present embodiment does not require a retaining wall, so that the basement portion of the building can be constructed close to the structure or road adjacent to the retaining wall space. The floor area of the basement can be expanded. Moreover, the construction period and construction cost for constructing and dismantling the retaining wall can be saved. Furthermore, since the posture of the building can be stably subsidized, the construction of the ground portion can be performed in parallel with the construction of the basement portion, and the construction period can be shortened.

本発明の潜函工法及び潜函工法用設備は、地下建築物の構築において、土留め壁を設ける場合にも好適に用いることができる。以下、これを第２実施形態として説明する。ここで、第１実施形態と共通する部材や工程については、同じ符号を付して説明を省略する。   The diving method and the equipment for the diving method of the present invention can be suitably used also when a retaining wall is provided in the construction of an underground building. Hereinafter, this will be described as a second embodiment. Here, members and processes common to the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

（第２実施形態）
第２実施形態の潜函工法用設備１０は、第１実施形態の潜函工法用設備１の構成の他、土留め壁１１を備える。また、第２実施形態の潜函工法では、図８に示すように、第１実施形態の各工程の他に、土留め壁設置工程Ｓ０を有する。
土留め壁設置工程Ｓ０は、全工程に先立ち、構真柱節設置工程Ｓ１の前に行われる。土留め壁１１の構築は、地中連続壁工法や柱列式工法の他、公知の工法を適宜用いることができる。第２実施形態においては、建築物５の地階部分５１の躯体により直接的又は間接的に土留め壁１１を支えることができるため、支保工の一部又は全部を省略することができる。従って、支保工を構築、解体するための工費、工期を縮小することができる。土留め壁１１は、工事完了後撤去してもよいし、そのまま地中に残すこともできる。 (Second Embodiment)
The submerged construction method equipment 10 of the second embodiment includes a retaining wall 11 in addition to the configuration of the submerged construction method equipment 1 of the first embodiment. Moreover, in the submerged construction method of 2nd Embodiment, as shown in FIG. 8, in addition to each process of 1st Embodiment, it has earth retaining wall installation process S0.
The earth retaining wall installation step S0 is performed prior to all the steps and before the structural pillar section installation step S1. For the construction of the retaining wall 11, a known construction method can be used as appropriate in addition to the underground continuous wall construction method and the columnar construction method. In 2nd Embodiment, since the earth retaining wall 11 can be supported directly or indirectly by the frame of the basement part 51 of the building 5, a part or all of the support work can be omitted. Therefore, the construction cost and construction period for constructing and dismantling the support work can be reduced. The earth retaining wall 11 may be removed after the construction is completed, or may be left in the ground as it is.

尚、本発明の潜函工法及び潜函工法用設備は、上記２つの実施形態に限定されるものではなく、地上部分のない地階部分のみの建築物を潜函する場合にも好適に用いることができる。地階部分は、図２に示したような２階のものに限られず、１階のみでも３階以上であってもよい。また、掘削工程Ｓ４は、他の工程と適宜並行して行ってもよい。   In addition, the diving method and the equipment for the diving method of the present invention are not limited to the above two embodiments, and can be suitably used when submerging only a basement portion having no ground portion. The basement portion is not limited to the one on the second floor as shown in FIG. 2, and may be only the first floor or three or more floors. Moreover, you may perform excavation process S4 in parallel with another process suitably.

本発明の潜函工法及び潜函工法用設備は、地上において建築物の地階部分を構築することができるため、建築物の地階部分を地下で建築することの不都合を解消することができ、地階部分と同時に地上部分を施工することにより建築工期を短縮することが可能であるため、建築物の地階部分を地下に沈設する方法として好適に用いることができる。   The diving method and the equipment for the diving method of the present invention can construct the basement part of the building on the ground, so it is possible to eliminate the inconvenience of building the basement part of the building underground, Since the construction period can be shortened by constructing the ground part at the same time, it can be suitably used as a method for sinking the basement part of the building underground.

１ 潜函工法用設備
１０ 潜函工法用設備
２ 現場打ち杭
３ 構真柱
３１ 第１の構真柱節
３２ 第２の構真柱節
３３ 第３の構真柱節
４ ジャッキ
５ 建築物
５１ 地階部分
５２ 外壁
５４ 防水板
５５ 刃口
９ａ 被支持部 DESCRIPTION OF SYMBOLS 1 Equipment for submersible construction method 10 Equipment for submersible construction method 2 Cast-in-place pile 3 Construction pillar 31 First construction pillar section 32 Second construction pillar section 33 Third construction pillar section 4 Jack 5 Building 51 Basement part 52 outer wall 54 waterproof plate 55 blade opening 9a supported portion

上記課題を解決するためになされた発明は、地盤を掘り下げながら建築物の地階部分を沈下させる潜函工法であって、地中に設けられる複数の現場打ち杭上に、軸方向に複数の構真柱節を取脱自在に連結してなる構真柱をそれぞれ立設する構真柱立設工程と、地上にて、前記地階部分の最下層階の耐圧版及び柱を除く部分のうち少なくとも外壁を含む一部を建造する地階部分建造工程と、前記各構真柱の最上位に位置する構真柱節の上端と前記地階部分建造工程で地階部分の一部を建造した建築物との間に、前記各構真柱の最上位に位置する構真柱節の軸方向長さ以上のストローク長を備えたジャッキを設置し、前記ジャッキを伸長して前記建築物を支持するジャッキ設置工程と、前記地階部分の下部地盤を掘削する掘削工程と、前記各ジャッキを同時に収縮して前記建築物を沈下させる沈下工程と、前記各構真柱の最上位の構真柱節のうちの予め順序が定められた構真柱節を、その構真
柱節とは非対応の各ジャッキにより前記建築物を支持しながら、その順序に従って、順に
取脱する構真柱節取脱工程と、前記掘削工程と並行して、前記沈下工程と、前記構真柱節取脱工程とを交互に繰り返して、前記建築物の地階部分を最終深度まで沈設させたのち、前記地階部分の最下層階の耐圧版及び柱を打設する最下層躯体完成工程とを有することを特徴とする。 The invention made to solve the above problems is a submerged construction method that sinks the basement portion of a building while digging the ground, and a plurality of constructions in the axial direction on a plurality of on-site piles provided in the ground. At least the outer wall of the base column erection process in which the pillars are formed by detachably connecting the column sections, and the ground floor part excluding the pressure plate and the pillar on the lowermost floor on the ground. a basement portion building step for building a part including said between Buildings part and construction of the upper end and the basement portion by the basement portion construction process of構真pillar section that is at the top of each構真column A jack installation step of installing a jack having a stroke length equal to or longer than the axial length of the construction column node located at the top of each construction column , and extending the jack to support the building; and A drilling process for excavating a lower ground of the basement portion, and A subsidence step of simultaneously contracting the key to sink the building, and a pre-set timber column of the top timber column of each timber column Supports the building by each non-compliant jack, and in accordance with the order of the construction, the construction column post-removing step is performed in order, the subsidence step, and the construction column post in parallel with the excavation step. And alternately removing and removing the basement portion of the building to the final depth, and then having a bottom layer frame completion step of placing a pressure-resistant plate and a pillar on the bottom floor of the basement portion. It is characterized by.

本発明の潜函工法は、前記地階部分建造工程において、前記外壁の下端に地盤に貫入する刃口を設けるとともに、前記外壁の外面及び前記刃口を防水板で覆い、前記最下層躯体完成工程において、前記外壁で囲まれた地盤上に防水層を前記防水板と水密に連結するよう敷設したのち前記防水層の上に耐圧版を打設することが好ましい。外壁の下端に地盤に貫入する刃口を備えることにより、周囲から土砂や地下水が、外壁下端をくぐって室内側へ流入することを抑制できる。また、外壁の外面に防水板を設けることにより、地階部分の防水性を格段に向上することができる。そして、地階部分がこのような刃口と防水板とを備えることにより、この外壁を土留め壁として用いることができる。 従って、土留め壁を省略できるため、土留め壁を構築、解体する工期、工費を節約できる。また、土留め壁のスペースだけ建築物の床面積を拡充することができ、建築物の外壁を隣接する構造物や道路との境界に近接して建築物の地階部分を建造することができる。 In the subsurface building method of the present invention, in the basement partial construction process, a lower end of the outer wall is provided with a blade that penetrates the ground, and the outer surface of the outer wall and the blade are covered with a waterproof plate , Preferably, a waterproof layer is laid on the ground surrounded by the outer wall so as to be watertightly connected to the waterproof plate, and then a pressure-resistant plate is placed on the waterproof layer . By providing the cutting edge that penetrates the ground at the lower end of the outer wall, it is possible to suppress earth and sand and groundwater from flowing from the surroundings to the indoor side through the lower end of the outer wall. Moreover, the waterproofness of a basement part can be improved significantly by providing a waterproof board in the outer surface of an outer wall. And the outer wall can be used as a retaining wall by providing the basement portion with such a blade and a waterproof plate. Therefore, since the retaining wall can be omitted, the construction period and construction cost for constructing and dismantling the retaining wall can be saved. Further, the floor area of the building can be expanded by the space of the retaining wall, and the basement portion of the building can be constructed by bringing the outer wall of the building close to the boundary with the adjacent structure or road.

本発明は、地盤を掘り下げながら建築物の地階部分を沈下させる際に用いられる潜函工法用設備であって、地中に設けられる複数の現場打ち杭と、前記複数の現場打ち杭上にそれぞれ立設され、建築物の地階部分を沈下させる際に順次取脱される第１の構真柱節、前記建築物の耐圧版に上端を残して埋設されるよう構成された第２の構真柱節、及び外周面にスタッドボルトが設けられ前記現場打ち杭に埋設される第３の構真柱節を有する複数の構真柱節を軸方向に取脱自在に連結してなる構真柱と、前記第１の構真柱節の軸方向長さ以上のストローク長を有し、前記各構真柱の最上位に位置する構真柱節の上端と前記地階部分を地上で建築した建築物との間にそれぞれ設置されて、前記各構真柱節のうち最上位に位置する構真柱節を予め定められた順序に従って取脱する際には前記建築物を支持するように、前記建築物を沈下させる際には同時に収縮するように構成されたジャッキとを備えることを特徴とする潜函工法用設備を含む。 The present invention is a submerged construction method equipment used for sinking a basement portion of a building while digging down the ground, and a plurality of on-site piles provided in the ground, and standing on each of the plurality of on-site piles. The first frame column that is installed and is removed sequentially when the basement portion of the building is sunk, and the second frame column that is configured to be embedded in the pressure-resistant plate of the building leaving the upper end. A built-up column formed by detachably connecting a plurality of built-up column columns having studs and a third built-up column node provided with stud bolts on the outer peripheral surface and embedded in the cast-in-place pile ; A building having a stroke length equal to or longer than the axial length of the first structural pillar and having the upper end of the structural pillar located at the top of each structural pillar and the basement portion constructed on the ground. Between the above and each of the above-mentioned timber pillars. A submarine construction facility comprising: a jack configured to support the building when removed in accordance with a predetermined order and to contract simultaneously when the building is sunk; Including.

Claims (3)

地盤を掘り下げながら建築物の地階部分を沈下させる潜函工法であって、
地中に設けられる複数の現場打ち杭上に、軸方向に複数の構真柱節を取脱自在に連結してなる構真柱をそれぞれ立設する構真柱立設工程と、
前記各構真柱の最上位に位置する構真柱節の上端と前記地階部分を地上で建造した建築物との間に、前記各構真柱節の軸方向長さ以上のストローク長を備えたジャッキを設置し、前記ジャッキを伸長して前記建築物を支持するジャッキ設置工程と、
前記地階部分の下部地盤を掘削する掘削工程と、
前記各ジャッキを同時に収縮して前記建築物を沈下させる沈下工程と、
前記各構真柱の最上位の構真柱節のうちの予め順序が定められた構真柱節を、その構真柱節とは非対応の各ジャッキにより前記建築物を支持しながら、その順序に従って、順に取脱する構真柱節取脱工程と
を有し、
前記掘削工程と並行して、前記沈下工程と、前記構真柱節取脱工程とを前記建築物の地階部分が沈設されるまで交互に繰り返すことを特徴とする潜函工法。 A submerged construction method that sinks the basement of a building while digging the ground,
A construction column erecting process for erecting a construction column formed by detachably connecting a plurality of construction column sections in the axial direction on a plurality of on-site piles provided in the ground,
A stroke length equal to or greater than the axial length of each of the structural pillars is provided between the upper end of the structural pillars located at the top of each of the structural pillars and the building in which the basement portion is constructed on the ground. A jack installation step of extending the jack and supporting the building by extending the jack;
An excavation process for excavating the lower ground of the basement portion;
A subsidence step of simultaneously shrinking each jack to subsidence the building;
While supporting the building with the jacks that are incompatible with the built-up column of the built-up column, the pre-set of the built-up column of the top column of the built-up column, A structure column removal process that sequentially removes according to the order,
In parallel with the excavation step, the subsidence method and the construction column removal and removal step are alternately repeated until the basement portion of the building is submerged. 前記建築物の地階部分の外壁の下端に、地盤に貫入する刃口を備えているとともに、前記外壁の外面に防水板を備えている請求項１に記載の潜函工法。   The submerged construction method according to claim 1, further comprising a cutting edge penetrating into the ground at the lower end of the outer wall of the basement portion of the building, and a waterproof plate on the outer surface of the outer wall. 地盤を掘り下げながら建築物の地階部分を沈下させる際に用いられる潜函工法用設備であって、
地中に設けられる複数の現場打ち杭と、
前記複数の現場打ち杭上にそれぞれ立設され、軸方向に複数の構真柱節を取脱自在に連結してなる構真柱と、
前記構真柱節の軸方向長さ以上のストローク長を有し、前記各構真柱の最上位に位置する構真柱節の上端と前記地階部分を地上で建築した建築物との間にそれぞれ設置されて、前記最上位に位置する構真柱節を予め定められた順序に従って取脱する際には前記建築物を支持するように、前記建築物を沈下させる際には同時に収縮するように構成されたジャッキと
を備えることを特徴とする潜函工法用設備。 Submarine construction equipment used to sink the basement of a building while digging the ground,
A plurality of on-site piles installed in the ground,
A built-up column that is erected on each of the plurality of on-site piles, and is formed by detachably connecting a plurality of built-up column sections in the axial direction;
It has a stroke length that is equal to or greater than the axial length of each of the structural pillars, and is located between the upper end of the structural pillars located at the top of each structural pillar and the building where the basement is built on the ground. Each is installed and supports the building when removing the top pillar located in accordance with a predetermined order, and simultaneously contracts when the building sinks. Submarine construction equipment, characterized by comprising a jack configured as described above.
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Cited By (6)

* Cited by examiner, † Cited by third party
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JP2015148086A (en) * 2014-02-06 2015-08-20 株式会社竹中工務店 Construction method of substructural column
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