JP6378873B2 - Artificial ground and construction method of artificial ground - Google Patents

Artificial ground and construction method of artificial ground Download PDF

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JP6378873B2
JP6378873B2 JP2013248405A JP2013248405A JP6378873B2 JP 6378873 B2 JP6378873 B2 JP 6378873B2 JP 2013248405 A JP2013248405 A JP 2013248405A JP 2013248405 A JP2013248405 A JP 2013248405A JP 6378873 B2 JP6378873 B2 JP 6378873B2
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雅章 浦邉
雅章 浦邉
勝憲 鈴木
勝憲 鈴木
亮介 大友
亮介 大友
肇 武藤
肇 武藤
裕司 田屋
裕司 田屋
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Takenaka Corp
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Description

本発明は、人工地盤及び人工地盤の構築工法に関する。   The present invention relates to an artificial ground and a construction method for an artificial ground.

特許文献1〜特許文献4には、既存構造物の解体により発生する解体コンクリートを再生した再生材を埋め戻して締固め、支持地盤や施工地盤として使用する技術が開示されている。   Patent Documents 1 to 4 disclose a technique of reclaiming and compacting a recycled material obtained by recycling demolished concrete generated by demolishing an existing structure and using it as a support ground or a construction ground.

特許文献5には、地下構造部の底盤部と地下外壁と、それらを自立状態に支持する構造部とを、少なくとも残す状態に地下構造部を解体し、底盤部と地下外壁と構造部とで構成される地下残留部の空間部に、流動化処理土を流し込んで一体的な基礎地盤を構築し、その基礎地盤上に新規建物を建築する建物建て替える技術が開示されている。   In Patent Document 5, the base plate part and the basement outer wall of the basement structure part and the structure part that supports them in a self-supporting state are dismantled to leave at least the basement part, the base plate part, the basement outer wall, and the structure part. There is disclosed a technique for rebuilding a building in which fluidized soil is poured into a space portion of a configured underground residual portion to construct an integral foundation ground and a new building is constructed on the foundation ground.

ここで、既存構造物の地下躯体の残留部の空間には、柱、梁、壁などが残されている。特に、底盤部上の空間(ピット部分)は基礎梁に囲まれている。よって、解体コンクリートを含む再生材で埋め戻し、重機や人力で締め固めることは非常に効率が悪い。また、流動化処理土による埋め戻しだけでは、流動化処理土の費用だけでなく、解体コンクリートの搬出費用及び処分費用が必要となり、コストが増大する。   Here, pillars, beams, walls, etc. remain in the space of the remaining part of the underground structure of the existing structure. In particular, the space (pit portion) on the bottom plate is surrounded by the foundation beam. Therefore, it is very inefficient to backfill with recycled materials including demolished concrete and compact with heavy machinery or human power. In addition, just refilling with fluidized soil requires not only the cost of fluidized soil, but also the cost of carrying out and disposing of demolition concrete, which increases costs.

よって、既存構造物の地下躯体以浅に計画された人工地盤を効率的に低コストで構築することが求められている。   Therefore, it is required to construct an artificial ground planned shallower than the underground structure of an existing structure efficiently and at a low cost.

特開2006−124962号公報Japanese Patent Application Laid-Open No. 2006-124962 特開2010−189960号公報JP 2010-189960 A 特開平11−336335号公報JP 11-336335 A 特開平11−350746号公報JP-A-11-350746 特開2007−170070号公報Japanese Patent Laid-Open No. 2007-170070

本発明は、既存構造物の地下躯体以浅に計画された人工地盤を効率的に低コストで構築することが課題である。   An object of the present invention is to efficiently and inexpensively construct an artificial ground planned shallower than an underground structure of an existing structure.

請求項1の発明は、解体された既存構造物の地下躯体の底盤部上の空間に流動化処理土を流し込んで第一層を形成する第一層形成工程と、前記第一層の上に前記既存構造物の解体によって発生した解体コンクリートを含む再生材を埋め戻して締め固めた締固層を積層した第二層を形成する第二層形成工程と、を有し、前記底盤部上にはスラブがあり、前記第一層形成工程では、前記スラブに孔を形成し、前記孔から前記スラブと前記底盤部との間の前記空間に、前記流動化処理土を流し込み、前記第二層形成工程では、前記スラブを解体して、前記解体コンクリートを含む前記再生材を埋め戻す、人工地盤の構築工法。 The invention of claim 1 includes a first layer forming step of forming a first layer by pouring fluidized soil into the space above the bottom base of the underground structure of the dismantled existing structure, and on the first layer. A second layer forming step of forming a second layer obtained by laminating a compacted layer obtained by backfilling and compacting a recycled material including demolished concrete generated by dismantling of the existing structure, and on the bottom plate part There is a slab, and in the first layer forming step, a hole is formed in the slab, and the fluidized soil is poured from the hole into the space between the slab and the bottom plate part, and the second layer is formed. In the forming step, an artificial ground construction method in which the slab is disassembled and the recycled material including the dismantled concrete is backfilled.

請求項1に記載の発明では、第一層形成工程で、既存構造物の地下躯体の底盤部上の空間は、例えば、基礎梁などが残っているが、流動化処理土を流し込むことで、既存構造物の解体によって発生した解体コンクリートを含む再生材を上部に埋め戻すことが可能な第一層が形成される。  In the invention according to claim 1, in the first layer forming step, in the space on the bottom base of the underground structure of the existing structure, for example, the foundation beam remains, but by pouring the fluidized soil, A first layer is formed in which a recycled material including demolished concrete generated by demolishing an existing structure can be backfilled.

そして、この第一層の上に、解体コンクリートを含む再生材を埋め戻して締め固めた締固層が積層した第二層を形成することで、底盤部上に人工地盤を容易に低コストで構築することができると共に、解体コンクリートの搬出費用や処分費用が抑制される。 And, on this first layer, by forming a second layer in which the reclaimed material containing demolished concrete is backfilled and compacted , the artificial ground is easily and inexpensively formed on the bottom plate. It can be constructed, and the cost of carrying out and disposing of demolition concrete is suppressed.

したがって、既存構造物の地下躯体以浅に計画された人工地盤を効率的に低コストで構築することができる。   Therefore, the artificial ground planned shallower than the underground structure of the existing structure can be efficiently constructed at low cost.

請求項2の発明は、解体された既存構造物の地下躯体の底盤部上の空間に流動化処理土を流し込んで第一層を形成する第一層形成工程と、前記第一層の上に前記既存構造物の解体によって発生した解体コンクリートを含む再生材を埋め戻して締め固めた締固層を積層した第二層を形成する第二層形成工程と、を有し、前記第二層形成工程では、上層面が計画床付レベルよりも上側に位置するように前記第二層を形成し、前記第二層形成工程の後に、前記第二層の上に前記第二層に使用した前記再生材よりも粒度が大きい再生材を埋め戻して施工地盤を形成する施工地盤形成工程を有し、前記施工地盤形成工程の後に、前記施工地盤及び前記第二層の上部を前記計画床付レベルまで掘削する掘削工程を有する、人工地盤の構築工法。 The invention of claim 2 includes a first layer forming step of forming a first layer by pouring fluidized soil into a space above the bottom base of the underground structure of the dismantled existing structure, and on the first layer. have a, a second layer forming step of forming a second layer formed by laminating a clamping solid layer compacted back fill the recycled material comprising a demolition concrete generated by dismantling of the existing structure, the second layer formed In the step, the second layer is formed such that the upper layer surface is located above the planned flooring level, and the second layer is used on the second layer after the second layer forming step. It has a construction ground forming step of backfilling recycled material having a particle size larger than the recycled material to form a construction ground, and after the construction ground forming step, the construction ground and the upper part of the second layer are at the level with the planned floor. An artificial ground construction method that has an excavation process that excavates to a minimum.

請求項2に記載の発明では、第一層形成工程で、既存構造物の地下躯体の底盤部上の空間は、例えば、基礎梁などが残っているが、流動化処理土を流し込むことで、既存構造物の解体によって発生した解体コンクリートを含む再生材を上部に埋め戻すことが可能な第一層が形成される。   In the invention according to claim 2, in the first layer formation step, the space on the bottom base of the underground structure of the existing structure has, for example, foundation beams remaining, but by pouring the fluidized soil, A first layer is formed in which a recycled material including demolished concrete generated by demolishing an existing structure can be backfilled.

そして、第二層形成工程で、この第一層の上に解体コンクリートを含む再生材を埋め戻して締め固め締固層を積層した第二層を形成することで底盤部上に人工地盤を容易に低コストで構築することができると共に、解体コンクリートの搬出費用や処分費用が抑制される。 And, in the second layer formation step, artificial ground can be easily formed on the bottom plate by forming a second layer in which recycled material containing demolition concrete is backfilled on this first layer and a compacted compacted layer is laminated. In addition, it can be constructed at low cost, and the cost of carrying out and disposal of demolition concrete is suppressed.

したがって、既存構造物の地下躯体以浅に計画された人工地盤を効率的に低コストで構築することができる。 Therefore, Ru can be constructed efficiently in low cost planned artificial ground underground precursor shallower existing structures.

本発明によれば、既存構造物の地下躯体以浅に計画された人工地盤を効率的に低コストで構築することができる。   ADVANTAGE OF THE INVENTION According to this invention, the artificial ground planned shallower than the underground frame of the existing structure can be constructed | assembled efficiently at low cost.

既存構造物の地下躯体以浅に計画された人工地盤及びこの人工地盤の上に更に再生材を埋め戻して施工地盤を構築した状態を示す断面図である。It is sectional drawing which shows the state which constructed the construction ground by refilling the reclaimed material further on the artificial ground planned shallower than the underground frame of the existing structure, and this artificial ground. 図6に示す底盤部を含む地下躯体の一部を残して既存構造物を解体した状態の断面図である。FIG. 7 is a cross-sectional view of a state in which an existing structure is dismantled while leaving a part of the underground frame including the bottom plate part shown in FIG. 6. 図2の状態から地下躯体のスラブと底盤部との間の空間部に流動化処理土流し込んで固めて第一層を構築した状態の断面図である。It is sectional drawing of the state which poured the fluidization process soil into the space part between the slab of a underground frame, and a bottom board part from the state of FIG. 図3の第一層の上に再生材で埋め戻して第二層を構築した状態の断面図である。FIG. 4 is a cross-sectional view of a state in which a second layer is constructed by backfilling with a recycled material on the first layer in FIG. 3. 図1の状態から計画床付レベルまで掘削し、新築構造物を構築した状態の断面図である。It is sectional drawing of the state which excavated from the state of FIG. 1 to a plan flooring level, and constructed the new construction structure. 底盤部を含む地下躯体の一部を残して既存構造物を解体した状態を模式的に示す全体図である。It is the whole figure which shows typically the state where the existing structure was demolished leaving a part of the underground frame including the bottom board part.

<人工地盤及び人工地盤の構築工法>
本発明の一実施形態に係る人工地盤及び人工地盤の構築工法について、既存構造物の地下躯体以浅に人工地盤を構築する工程で説明していく。
<Artificial ground and construction method of artificial ground>
An artificial ground and an artificial ground construction method according to an embodiment of the present invention will be described in a process of constructing an artificial ground shallower than an underground structure of an existing structure.

図6に示すように、複数階からなる地下躯体(地下構造部)12を有する鉄筋コンクリート製(又は鉄骨鉄筋コンクリート製)の既存構造物10が、地盤80に構築されている。そして、既存構造物10を解体して、新たに新築構造物150(図5参照)を構築する。この新築構造物150(図6参照)の地下の計画床付レベルLは、既存構造物10の地下躯体12以浅に計画されている。   As shown in FIG. 6, an existing structure 10 made of reinforced concrete (or made of steel reinforced concrete) having an underground frame (underground structure portion) 12 composed of a plurality of floors is constructed on the ground 80. Then, the existing structure 10 is disassembled, and a new structure 150 (see FIG. 5) is newly constructed. The underground planned floor level L of this new structure 150 (see FIG. 6) is planned to be shallower than the underground structure 12 of the existing structure 10.

まず、図6及び図2に示すように、底盤部14を含む地下躯体12の一部を残して既存構造物10を解体重機で解体する。   First, as shown in FIGS. 6 and 2, the existing structure 10 is disassembled with a weight-removing machine, leaving a part of the underground skeleton 12 including the bottom board portion 14.

図2に示すように、地下躯体12のスラブ16にコア(孔)18を形成する。そして、図3に示すように、地下躯体12のスラブ16のコア18から、スラブ16と底盤部14との間の空間部20(図6も参照)に、図示してないポンプで流動化処理土30を流し込んで固める。なお、この流動化処理土30で構築した層を第一層102とする。   As shown in FIG. 2, a core (hole) 18 is formed in the slab 16 of the underground frame 12. Then, as shown in FIG. 3, fluidization processing is performed by a pump (not shown) from the core 18 of the slab 16 of the underground skeleton 12 to the space 20 (see also FIG. 6) between the slab 16 and the bottom plate part 14. Pour the soil 30 and harden. The layer constructed with the fluidized soil 30 is referred to as a first layer 102.

なお、流動化処理土30は、土や土砂等の被処理土、セメント及び水を流動化処理土製造装置で混練して作製した流動性を有する埋め戻し材である。よって、空間部20には地下躯体12の柱、梁、壁などが存在するが、流動化処理土30は流動性があるので、スラブ16と底盤部14との間の空間部20の隅々まで行き渡り、迅速に埋め戻すことができる。また、締め固めも不要である。   The fluidized soil 30 is a backfill material having fluidity produced by kneading soil to be treated such as soil or earth and sand, cement and water with a fluidized soil production apparatus. Therefore, although there are pillars, beams, walls, and the like of the underground frame 12 in the space portion 20, the fluidized soil 30 has fluidity, so every corner of the space portion 20 between the slab 16 and the bottom plate portion 14. Can be refilled quickly. Also, compaction is not necessary.

図1に示すように、スラブ16(図3参照)を解体すると共に、既存構造物10(図6参照)の解体によって発生した解体コンクリートと再生砕石とを含む再生材40を第一層102の上に埋め戻し、転圧作業を行って締め固め第二層106を構築する。なお、第二層106の上層面106Aは、計画床付レベルLよりも上側に位置する。また、本実施形態では、第二層106は、約30cmの厚さに締固めた締固層104が11層形成されることで構築されている。 As shown in FIG. 1 , the slab 16 (see FIG. 3) is disassembled, and a recycled material 40 including demolition concrete and recycled crushed stone generated by dismantling the existing structure 10 (see FIG. 6) Back-filling is performed, and the compaction second layer 106 is constructed by performing a rolling operation. The upper surface 106A of the second layer 106 is positioned above the planned floor level L. In the present embodiment, the second layer 106 is constructed by forming 11 layers of the compacted layer 104 compacted to a thickness of about 30 cm.

なお、流動化処理土30で構成された第一層102と、再生材40で構成された複数(本実施形態では11層)の締固層104からなる第二層106と、で本発明の一実施形態に係る人工地盤100が構成されている。   The first layer 102 composed of the fluidized soil 30 and the second layer 106 composed of a plurality of (11 layers in this embodiment) consolidated layers 104 composed of the recycled material 40 are used in the present invention. An artificial ground 100 according to an embodiment is configured.

更に、図4に示すように、第二層106の上に再生材42を埋め戻す。そして、人工地盤100の上に埋め戻された再生材42の施工地盤上で各種建設作業を行う。なお、再生材42は、第二層102に使用した再生材40よりも粒度が大きい。また、第二層106の上に埋め戻す再生材42は、締め固めが行われていない(締め固める必要はない)。 Further, as shown in FIG. 4, the recycled material 42 is backfilled on the second layer 106. And various construction work is performed on the construction ground of the recycled material 42 buried back on the artificial ground 100. The recycled material 42 has a larger particle size than the recycled material 40 used for the second layer 102. Further, the recycled material 42 to be backfilled on the second layer 106 is not compacted (it is not necessary to compact).

図5に示すように、新築構造物150を建設する際に、埋め戻した再生材42(施工地盤)及び人工地盤100の第二層106の上部(一部)を計画床付レベルLまで掘削する。そして、計画床付レベルLを下端とする直接基礎152を構築し、新築構造物150を建設する。なお、本実施形態では、新築構造物150の基礎は、直接基礎152と図示していない杭とを有するパイル・ドラフト基礎である。   As shown in FIG. 5, when the new structure 150 is constructed, the reclaimed recycled material 42 (construction ground) and the upper part (part) of the second layer 106 of the artificial ground 100 are excavated to the planned floor level L. To do. And the direct foundation 152 which makes the level L with a plan floor the lower end is constructed, and the new structure 150 is constructed. In the present embodiment, the foundation of the new structure 150 is a pile draft foundation having a direct foundation 152 and a pile (not shown).

<作用及び効果>
つぎに本実施形態の作用及び効果について説明する。
<Action and effect>
Next, the operation and effect of this embodiment will be described.

既存構造物10の地下躯体12の底盤部14の上の空間部20は、例えば、柱、梁、壁などが残っているが、流動化処理土30を流し込むことで、既存構造物10の解体によって発生した解体コンクリートを含む再生材40を上部に埋め戻すことが可能な第一層102が形成される。   For example, pillars, beams, walls, and the like remain in the space 20 above the bottom plate portion 14 of the underground structure 12 of the existing structure 10, but by disposing the fluidized soil 30, the existing structure 10 is disassembled. As a result, the first layer 102 capable of backfilling the recycled material 40 including the demolished concrete generated by the above is formed.

そして、この第一層102の上に、解体コンクリートを含む再生材40を埋め戻して締め固め第二層106を形成することで、底盤部14の上に、新築構造物150を支持することが可能な人工地盤(支持地盤)100を容易に低コストで構築することができると共に、解体コンクリートの搬出量及び処理量が削減され、この結果、搬出費用及び処理費用が抑制される。   Then, by refilling the recycled material 40 including demolition concrete on the first layer 102 and compacting it to form the second layer 106, the new structure 150 can be supported on the bottom plate portion 14. A possible artificial ground (supporting ground) 100 can be easily constructed at low cost, and the amount and amount of dismantled concrete carried out are reduced. As a result, the carrying-out cost and the processing cost are suppressed.

したがって、既存構造物10の地下躯体12以浅に計画床付レベルLが計画された人工地盤(支持地盤)100を効率的に低コストで構築することができる。   Therefore, the artificial ground (support ground) 100 where the planned floor level L is planned shallower than the underground structure 12 of the existing structure 10 can be efficiently constructed at low cost.

ここで、既存構造物10の解体によって発生した解体コンクリートは、建設現場からトラックで搬出する。この建設現場が、繁華街、ビジネス街、或いは住宅地の近隣などの場合、トラックの通行が制限される場合がある。このようにトラックの通行が制限されると解体コンクリートの搬出に多くの時間が必要となり、建設工期に影響を与えることになる。しかし、本発明を適用することで、解体コンクリートを含む再生材40を人工地盤100に用いることが可能となり、解体コンクリートの搬出量が削減され、トラックの通行が制限されることによる建設工期への影響が抑制される。   Here, the demolished concrete generated by the dismantling of the existing structure 10 is carried out from the construction site by a truck. When this construction site is a downtown area, a business area, or a neighborhood of a residential area, the traffic of the truck may be restricted. If the truck is restricted in this way, it takes a lot of time to carry out the demolished concrete, which affects the construction period. However, by applying the present invention, it becomes possible to use the reclaimed material 40 including demolition concrete for the artificial ground 100, reducing the amount of demolition concrete carried out, and restricting the passage of the truck. Influence is suppressed.

<その他>
尚、本発明は上記実施形態に限定されない。
本発明は、既存構造物の地下躯体以浅に計画された人工的に作られる建設用の地盤全般に適用することができる。
また、本発明の要旨を逸脱しない範囲において種々なる態様で実施し得ることは言うまでもない
<Others>
The present invention is not limited to the above embodiment.
INDUSTRIAL APPLICABILITY The present invention can be applied to all artificially constructed construction ground planned shallower than an underground structure of an existing structure.
Moreover, it cannot be overemphasized that it can implement with a various aspect in the range which does not deviate from the summary of this invention.

10 既存構造物
12 地下躯体
14 底盤部
20 空間部(空間)
30 流動化処理土
40 再生材
100 人工地盤
102 第一層
106 第二層
10 Existing structures
12 underground building
14 Bottom board
20 Space (space)
30 Fluidized soil
40 Recycled material 100 Artificial ground 102 First layer 106 Second layer

Claims (2)

解体された既存構造物の地下躯体の底盤部上の空間に流動化処理土を流し込んで第一層を形成する第一層形成工程と、  A first layer forming step of forming a first layer by pouring fluidized soil into the space above the bottom base of the underground structure of the dismantled existing structure;
前記第一層の上に前記既存構造物の解体によって発生した解体コンクリートを含む再生材を埋め戻して締め固めた締固層を積層した第二層を形成する第二層形成工程と、  A second layer forming step of forming a second layer obtained by laminating a compacted layer backfilled with a reclaimed material including demolished concrete generated by dismantling of the existing structure on the first layer;
を有し、  Have
前記底盤部上にはスラブがあり、  There is a slab on the bottom board,
前記第一層形成工程では、前記スラブに孔を形成し、前記孔から前記スラブと前記底盤部との間の前記空間に、前記流動化処理土を流し込み、  In the first layer forming step, a hole is formed in the slab, and the fluidized soil is poured from the hole into the space between the slab and the bottom plate part,
前記第二層形成工程では、前記スラブを解体して、前記解体コンクリートを含む前記再生材を埋め戻す、  In the second layer forming step, the slab is disassembled and the recycled material containing the dismantled concrete is backfilled.
人工地盤の構築工法。  Construction method for artificial ground.
解体された既存構造物の地下躯体の底盤部上の空間に流動化処理土を流し込んで第一層を形成する第一層形成工程と、
前記第一層の上に前記既存構造物の解体によって発生した解体コンクリートを含む再生材を埋め戻して締め固めた締固層を積層した第二層を形成する第二層形成工程と、
を有し、
前記第二層形成工程では、上層面が計画床付レベルよりも上側に位置するように前記第二層を形成し、
前記第二層形成工程の後に、前記第二層の上に前記第二層に使用した前記再生材よりも粒度が大きい再生材を埋め戻して施工地盤を形成する施工地盤形成工程を有し、
前記施工地盤形成工程の後に、前記施工地盤及び前記第二層の上部を前記計画床付レベルまで掘削する掘削工程を有する、
人工地盤の構築工法。
A first layer forming step of forming a first layer by pouring fluidized soil into the space above the bottom base of the underground structure of the dismantled existing structure;
A second layer forming step of forming a second layer obtained by laminating a compacted layer backfilled with a reclaimed material including demolished concrete generated by dismantling of the existing structure on the first layer;
I have a,
In the second layer forming step, the second layer is formed so that the upper layer surface is located above the planned floor level,
After the second layer forming step, it has a construction ground forming step in which a reclaimed material having a particle size larger than the reclaimed material used for the second layer is refilled on the second layer to form a construction ground.
After the construction ground formation step, the excavation step of excavating the construction ground and the upper part of the second layer to the planned flooring level,
Construction method for artificial ground.
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