JP2019127747A - Construction method for structure - Google Patents

Construction method for structure Download PDF

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JP2019127747A
JP2019127747A JP2018009801A JP2018009801A JP2019127747A JP 2019127747 A JP2019127747 A JP 2019127747A JP 2018009801 A JP2018009801 A JP 2018009801A JP 2018009801 A JP2018009801 A JP 2018009801A JP 2019127747 A JP2019127747 A JP 2019127747A
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underground structure
new
service
underground
constructed
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JP7173459B2 (en
Inventor
青木 雅路
Masamichi Aoki
雅路 青木
貴穂 河野
Takao Kono
貴穂 河野
博人 熊谷
Hiroto Kumagai
博人 熊谷
公章 方田
Kimiaki Katada
公章 方田
昭次 山川
Shoji Yamakawa
昭次 山川
稔 岡橋
Minoru Okabashi
稔 岡橋
佐藤 俊介
Shunsuke Sato
俊介 佐藤
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Takenaka Komuten Co Ltd
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Takenaka Komuten Co Ltd
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Priority to JP2018009801A priority Critical patent/JP7173459B2/en
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Priority to JP2022110398A priority patent/JP7293567B2/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/20Hydro energy

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  • Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
  • Working Measures On Existing Buildindgs (AREA)

Abstract

To provide a means for inhibiting floating of concurrent use underground structures.SOLUTION: A construction method for a structure in this invention is for constructing a new structure 20 that has a new underground structure body 20A adjacent in plane view to a concurrent use underground structure 16. The construction method for the structure includes: a partial construction process in which the excavation area R for the new underground structure body 20A is excavated leaving the area facing the concurrent use underground structure 16 unexcavated, and a main body 20X of the new underground structure body 20A is constructed; and another construction process in the area facing the concurrent use underground structure, in which the rest of the excavation area R in the area facing the concurrent use underground structure 16 is excavated, and the part of the new underground structure body 20A, facing the concurrent use underground structure 16, is constructed.SELECTED DRAWING: Figure 4

Description

本発明は、構造物の施工方法に関する。   The present invention relates to a construction method for a structure.

既設地下構造体を建て替える際に、既設地下構造体の外周部を山留め壁として利用する構造物の施工方法が知られている(例えば、特許文献1参照)。   There is a known construction method for a structure that uses an outer peripheral portion of an existing underground structure as a retaining wall when rebuilding an existing underground structure (see, for example, Patent Document 1).

特開2017−166139号公報JP, 2017-166139, A

ところで、平面視にて供用中地下構造物の隣に、新設地下構造体を備える構造物を施工する場合がある。この場合、平面視にて供用中地下構造物と隣り合う地盤を掘削すると、掘削領域、及びその周辺の地盤が浮き上がる可能性がある。この結果、供用中地下構造物も浮き上がり、当該供用中地下構造物が影響を受ける可能性がある。   By the way, a structure provided with a new underground structure may be constructed next to the in-service underground structure in plan view. In this case, when excavating the ground adjacent to the in-service underground structure in plan view, the excavation area and the surrounding ground may be lifted. As a result, the underground structure in service may also be lifted, and the underground structure in service may be affected.

これと同様に、平面視にて供用中地下構造物の隣にある既設地下構造体を解体し、新設地下構造体を備える構造物を施工する場合がある。この場合、既設地下構造体を解体すると、解体領域、及びその周辺の地盤が浮き上がる可能性がある。この結果、供用中地下構造物も浮き上がり、当該供用中地下構造物が影響を受ける可能性がある。   Similarly, the existing underground structure next to the in-service underground structure in plan view may be dismantled and a structure including the newly installed underground structure may be constructed. In this case, when the existing underground structure is disassembled, the dismantling area and the ground in the vicinity of the dismantling area may be lifted. As a result, the underground structure in service may also be lifted, and the underground structure in service may be affected.

本発明は、上記の事実を考慮し、供用中地下構造物の浮き上がりを抑制することを目的とする。   In view of the above facts, an object of the present invention is to suppress the floating of an in-service underground structure.

請求項1に記載の構造物の施工方法は、平面視にて供用中地下構造物と隣り合う新設地下構造体を有する構造物を施工する構造物の施工方法であって、前記新設地下構造体用の掘削領域を、前記供用中地下構造物側を残して掘削し、前記新設地下構造体の一部を施工する一部施工工程と、残された前記掘削領域の前記供用中地下構造物側を掘削し、前記新設地下構造体における前記供用中地下構造物側を施工する供用中地下構造物側施工工程と、を備える。   The construction method of the structure according to claim 1 is a construction method of a structure for constructing a structure having a new underground structure adjacent to the underground structure in service in plan view, the new underground structure And excavating areas for the remaining underground construction side during the service, and partially constructing the construction of a part of the new underground structure, and the in-service underground construction side of the remaining excavated area In-service underground construction side construction step of excavating and constructing the in-service underground construction side in the new construction underground structure.

請求項1に係る構造物の施工方法によれば、先ず、一部施工工程において、新設地下構造体用の掘削領域を、供用中地下構造物側を残して掘削し、新設地下構造体の一部を施工する。   According to the construction method of the structure according to claim 1, first, in a part of the construction process, the excavated region for the new underground structure is excavated leaving the underground structure side during service, and one of the new underground structure Install the department.

これにより、掘削領域に残された供用中地下構造物側の地盤、及び施工された新設地下構造体の一部の重量によって、掘削領域、及びその周辺の地盤の浮き上がりが抑制される。したがって、供用中地下構造物の浮き上がりが抑制される。   Thereby, the floating of the excavated area and the ground around the excavated area is suppressed by the ground on the side of the in-service underground structure remaining in the excavated area and the weight of a part of the constructed new underground structure. Therefore, the floating of the underground structure during service is suppressed.

次に、供用中地下構造物側施工工程において、残された掘削領域の供用中地下構造物側の地盤を掘削し、新設地下構造体における供用中地下構造物側を施工する。この供用中地下構造物側施工工程では、新設地下構造体における供用中地下構造物側が施工されるまでは、新設地下構造体の一部の重量によって、掘削領域、及びその周辺の地盤の浮き上がりが抑制される。したがって、供用中地下構造物の浮き上がりが抑制される。   Next, in the in-service underground structure side construction process, the ground on the in-service underground structure side of the remaining excavated region is excavated, and the in-service underground structure side in the new underground structure is constructed. In this in-service underground structure side construction process, until the in-service underground structure side of the new underground structure is constructed, the excavated area and surrounding ground are lifted by the weight of a part of the new underground structure. Be suppressed. Therefore, the floating of the underground structure during service is suppressed.

また、供用中地下構造物側施工工程において、例えば、新設地下構造体における供用中地下構造物側を逆打ち工法によって施工することにより、供用中地下構造物の浮き上がりがさらに抑制される。   In addition, in the in-service underground structure side construction step, for example, by constructing the in-service underground structure side of the new underground structure by the reverse operation method, the floating of the in-service underground structure is further suppressed.

請求項2に記載の構造物の施工方法は、請求項1に記載の構造物の施工方法において、前記一部施工工程において、前記掘削領域を前記新設地下構造体の前記一部が施工される第一領域と、前記新設地下構造体における前記新設地下構造体側が施工される第二領域とに仮設山留め壁で仕切った状態で、前記第一領域を掘削する。   The construction method according to claim 2 is the construction method according to claim 1, wherein in the partial construction step, the part of the newly installed underground structure is constructed in the excavation area. The first area is excavated in a state where the first area and the second area where the new underground structure side is constructed are partitioned by a temporary retaining wall.

請求項2に係る構造物の施工方法によれば、一部施工工程において、掘削領域を新設地下構造体の一部が施工される第一領域と、新設地下構造体における新設地下構造体側が施工される第二領域とに仮設山留め壁で仕切り、この状態で、掘削領域の第一領域を掘削する。   According to the construction method of the structure according to claim 2, in the partial construction process, the excavated area is the first area where a part of the new underground structure is to be constructed, and the new underground structure side in the new underground structure is constructed In this state, the first area of the excavation area is excavated.

これにより、第二領域に先行して、第一領域を容易に掘削することができる。   Thereby, the first area can be easily excavated prior to the second area.

請求項3に記載の構造物の施工方法は、平面視にて供用中地下構造物と隣り合う既設地下構造体を解体し、新設地下構造体を有する構造物を施工する構造物の施工方法であって、前記既設地下構造体を、前記供用中地下構造物側を残して解体し、前記新設地下構造体の一部を施工する一部施工工程と、残された前記既設地下構造体の前記供用中地下構造物側を解体し、前記新設地下構造体における前記供用中地下構造物側を施工する供用中地下構造物側施工工程と、を備える。   The construction method of the structure according to claim 3 is a construction method of a structure for disassembling an existing underground structure adjacent to the underground structure in service in plan view, and constructing a structure having a new underground structure. And removing the existing underground structure leaving the in-service underground structure side, and partially constructing a part of the new underground structure, and the remaining existing underground structure An in-service underground structure side construction step of dismantling the in-service underground structure side and constructing the in-service underground structure side in the newly installed underground structure.

請求項3に係る構造物の施工方法によれば、先ず、一部施工工程において、既設地下構造体を、供用中地下構造物側を残して解体し、新設地下構造体の一部を施工する。   According to the construction method of the structure according to claim 3, first, in the partial construction process, the existing underground structure is disassembled leaving the in-service underground structure side, and a part of the new underground structure is constructed. .

これにより、残された既設地下構造体の供用中地下構造物側、及び施工された新設地下構造体の一部の重量によって、既設地下構造体の解体領域、及びその周辺の地盤の浮き上がりが抑制される。したがって、供用中地下構造物の浮き上がりが抑制される。   Thereby, the floating structure side of the existing underground structure and the surrounding ground are suppressed by the weight of a part of the existing underground structure remaining in service and the weight of a part of the constructed new underground structure. Be done. Therefore, the floating of the underground structure during service is suppressed.

次に、供用中地下構造物側施工工程において、残された既設地下構造体の供用中地下構造物側を解体し、新設地下構造体における供用中地下構造物側を施工する。この供用中地下構造物側施工工程では、新設地下構造体の供用中地下構造物側が施工されるまでは、新設地下構造体の一部によって、既設地下構造体の解体領域、及びその周辺の地盤の浮き上がりが抑制される。したがって、供用中地下構造物の浮き上がりが抑制される。   Next, in the in-service underground structure side construction process, the remaining in-service underground structure side of the existing underground structure is disassembled, and the in-service underground structure side in the new underground structure is constructed. In this in-service underground structure side construction process, until the in-service underground structure side of the new underground structure is constructed, a part of the new underground structure dismantles the existing underground structure and the ground around it Uplift is suppressed. Therefore, the floating of the underground structure during service is suppressed.

また、供用中地下構造物側施工工程において、例えば、新設地下構造体における供用中地下構造物側を逆打ち工法によって施工することにより、供用中地下構造物の浮き上がりがさらに抑制される。   In addition, in the in-service underground structure side construction step, for example, by constructing the in-service underground structure side of the new underground structure by the reverse operation method, the floating of the in-service underground structure is further suppressed.

以上説明したように、本発明によれば、供用中地下構造物の浮き上がりを抑制することができる。   As described above, according to the present invention, it is possible to suppress the floating of the in-service underground structure.

第一実施形態に係る構造物の施工方法が適用される地盤を示す縦断面図である。It is a longitudinal section showing the ground where the construction method of the structure concerning a first embodiment is applied. 第一実施形態に係る構造物の施工方法によって施工された新設構造物を示す縦断面図である。It is a longitudinal cross-sectional view which shows the new structure constructed by the construction method of the structure which concerns on 1st embodiment. 第一実施形態に係る構造物の施工方法の施工過程を示す縦断面図である。It is a longitudinal cross-sectional view which shows the construction process of the construction method of the structure which concerns on 1st embodiment. 第一実施形態に係る構造物の施工方法の施工過程を示す縦断面図である。It is a longitudinal cross-sectional view which shows the construction process of the construction method of the structure which concerns on 1st embodiment. 第二実施形態に係る構造物の施工方法が適用される既設構造物を示す縦断面図である。It is a longitudinal cross-sectional view which shows the existing structure to which the construction method of the structure which concerns on 2nd embodiment is applied. 第二実施形態に係る構造物の施工方法の施工過程を示す縦断面図である。It is a longitudinal cross-sectional view which shows the construction process of the construction method of the structure which concerns on 2nd embodiment. 第二実施形態に係る構造物の施工方法の施工過程を示す縦断面図である。It is a longitudinal cross-sectional view which shows the construction process of the construction method of the structure which concerns on 2nd embodiment. 第二実施形態に係る構造物の施工方法の変形例を示す縦断面図である。It is a longitudinal cross-sectional view which shows the modification of the construction method of the structure which concerns on 2nd embodiment. 第一実施形態に係る構造物の施工方法の変形例を示す縦断面図である。It is a longitudinal cross-sectional view which shows the modification of the construction method of the structure which concerns on 1st embodiment. 第一実施形態に係る構造物の施工方法の変形例を示す縦断面図である。It is a longitudinal cross-sectional view which shows the modification of the construction method of the structure which concerns on 1st embodiment. 第一実施形態に係る構造物の施工方法の変形例を示す縦断面図である。It is a longitudinal cross-sectional view which shows the modification of the construction method of the structure which concerns on 1st embodiment. 第一実施形態に係る構造物の施工方法の変形例を示す縦断面図である。It is a longitudinal cross-sectional view which shows the modification of the construction method of the structure which concerns on 1st embodiment.

(第一実施形態)
先ず、第一実施形態について説明する。
(First embodiment)
First, the first embodiment will be described.

図1に示されるように、本実施形態に係る構造物の施工方法は、供用中地下構造物16が設けられた地盤12に適用される。供用中地下構造物16は、例えば、営業中の鉄道(地下鉄)や道路とされており、地盤12(地中)に埋設されている。   As FIG. 1 shows, the construction method of the structure which concerns on this embodiment is applied to the ground 12 in which the in-service underground structure 16 was provided. The in-service underground structure 16 is, for example, an operating railway (subway) or road, and is embedded in the ground 12 (underground).

なお、供用中地下構造物16は、少なくとも一部が地盤12に埋設されていれば良い。   In-service underground structure 16 only needs to be at least partially embedded in ground 12.

(構造物)
図2に示されるように、本実施形態では、供用中地下構造物16の隣の地盤12(掘削領域R)を掘削して、新設構造物20を施工(構築)する。新設構造物20は、複数層からなり、平面視にて、供用中地下構造物16と隣り合って配置される。
(Structure)
As shown in FIG. 2, in this embodiment, the ground 12 adjacent to the in-service underground structure 16 (excavation region R) is excavated and the new structure 20 is constructed (constructed). The new structure 20 is composed of a plurality of layers, and is disposed adjacent to the in-service underground structure 16 in plan view.

新設構造物20は、複数の柱22と、隣り合う柱22に架設される複数の梁24と、梁24に支持される床スラブ26とを有して構成される。なお、新設構造物20の内部の柱22は、構真柱用杭21に支持され、新設構造物20の外周の柱22は、後述する山留め壁30に支持される。   The new structure 20 includes a plurality of columns 22, a plurality of beams 24 installed on adjacent columns 22, and a floor slab 26 supported by the beams 24. The pillars 22 inside the new construction 20 are supported by the piles 21 for the construction pillars, and the pillars 22 on the outer periphery of the new construction 20 are supported by the retaining walls 30 described later.

新設構造物20は、地盤12中に設けられる新設地下構造体20Aと、地上に設けられる新設地上構造体20Bとを有している。新設地下構造体20Aは、地盤12の掘削領域Rに設けられる。また、新設地下構造体20Aの上には、新設地上構造体20Bが設けられる。   The new structure 20 has a new underground structure 20A provided in the ground 12 and a new ground structure 20B provided on the ground. The new underground structure 20 </ b> A is provided in the excavation region R of the ground 12. Further, a new above-ground structure 20B is provided on the new underground structure 20A.

なお、新設地下構造体20A及び新設地上構造体20Bは、単一層であっても良い。また、新設構造物20は、少なくとも新設地下構造体20Aを有していれば良く、新設地上構造体20Bは省略されても良い。また、新設構造物20は、構造物の一例である。   The new underground structure 20A and the new ground structure 20B may be a single layer. Moreover, the new structure 20 should just have the new underground structure 20A at least, and the new ground structure 20B may be abbreviate | omitted. The new structure 20 is an example of a structure.

(構造物の施工方法)
次に、構造物の施工方法の一例について説明する。
(Construction method of structure)
Next, an example of the construction method of a structure is demonstrated.

本実施形態に係る構造物の施工方法では、先ず、新設構造物20の供用中地下構造物16側の外周部20Yを残して、新設構造物20の外周部20Y以外の本体部20Xを施工する。次に、新設構造物20の外周部20Yを施工する。以下、本実施形態に係る構造物の施工方法を具体的に説明する。   In the construction method of a structure according to the present embodiment, first, the main body 20X other than the outer peripheral portion 20Y of the new structure 20 is constructed, leaving the outer peripheral portion 20Y of the new structure 20 on the in-service underground structure 16 side. . Next, the outer peripheral portion 20Y of the new structure 20 is constructed. Hereinafter, the construction method of the structure concerning this embodiment is explained concretely.

なお、ここでいう新設構造物20の外周部20Yとは、例えば、供用中地下構造物16及び新設構造物20を含む縦断面において、供用中地下構造物16側の1スパン部分(1つの柱梁架構部分)を意味する。また、新設構造物20の外周部20Yは、構造物における供用中地下構造物側(の部位)の一例である。また、新設構造物20の本体部20Xは、構造物の一部の一例である。   The outer peripheral portion 20Y of the new structure 20 mentioned here is, for example, one span portion on the in-service underground structure 16 side (one pillar in the longitudinal section including the in-service underground structure 16 and the new structure 20). It means a beam frame part). Moreover, the outer peripheral part 20Y of the new structure 20 is an example of the in-service underground structure side (part thereof) in the structure. The main body 20X of the new structure 20 is an example of a part of the structure.

(山留め壁施工工程)
先ず、山留め壁施工工程について説明する。図1に示されるように、山留め壁施工工程では、地盤12の掘削領域Rの外周部に、山留め壁30を施工する。山留め壁30は、掘削領域Rを囲むように、例えば、平面視にて枠状に形成する。この山留め壁30のうち、供用中地下構造物16側の山留め壁30Aは、供用中地下構造物16と対向して配置されている。
(Mounting wall construction process)
First, the retaining wall construction process will be described. As shown in FIG. 1, in the retaining wall construction process, a retaining wall 30 is constructed on the outer periphery of the excavation region R of the ground 12. The retaining wall 30 is formed in a frame shape in plan view, for example, so as to surround the excavated region R. Among the mountain retaining walls 30, the mountain retaining wall 30 </ b> A on the side of the in-service underground structure 16 is disposed to face the in-service underground structure 16.

なお、山留め壁30は、例えば、地中連続壁(コンクリート壁)や、地盤改良壁(ソイルセメント壁)、親杭横矢板等の鋼製壁によって形成されている。   In addition, the mountain retaining wall 30 is formed by steel walls, such as an underground continuous wall (concrete wall), a ground improvement wall (soil cement wall), a parent pile sheet pile, etc., for example.

(一部施工工程)
次に、一部施工工程について説明する。図1に示されるように、一部施工工程では、先ず、地盤12の掘削領域Rに、山留め壁30Aと対向する仮設山留め壁34を施工する。仮設山留め壁34は、例えば、親杭横矢板等の鋼製壁とされる。この仮設山留め壁34によって、掘削領域Rを供用中地下構造物16側の第二領域RYと、第二領域RY以外の第一領域RXとに仕切る。第一領域RXは、新設構造物20の本体部20Xが施工される領域とされ、第二領域RYは、新設構造物20の外周部20Yが施工される領域とされる。
(Part construction process)
Next, a partial construction process will be described. As shown in FIG. 1, in the partial construction process, first, a temporary mountain retaining wall 34 facing the mountain retaining wall 30A is constructed in the excavated region R of the ground 12. The temporary earth retaining wall 34 is, for example, a steel wall such as a parent pile horizontal sheet pile. The temporary rocking wall 34 divides the excavated area R into a second area RY on the in-service underground structure 16 side and a first area RX other than the second area RY. The first area RX is an area where the main body 20X of the new structure 20 is to be installed, and the second area RY is an area where the outer peripheral portion 20Y of the new structure 20 is to be applied.

なお、仮設山留め壁34は、親杭横矢板等の鋼製壁に限らず、地中連続壁(コンクリート壁)や、地盤改良壁(ソイルセメント壁)であっても良い。   In addition, the temporary mountain retaining wall 34 is not limited to a steel wall such as a parent pile sheet pile, but may be an underground continuous wall (concrete wall) or a ground improvement wall (soil cement wall).

次に、図3に示されるように、掘削領域Rのうち、第二領域RYを残して第一領域RXを図示しない重機等によって掘削し、新設構造物20の本体部20Xを逆打ち工法によって施工する。具体的には、先ず、第一領域RXの根切り底R1よりも下に、複数の構真柱用杭21を施工するとともに、各構真柱用杭21上に構真柱22を打設する。   Next, as shown in FIG. 3, the first area RX is excavated by heavy machinery etc. (not shown) leaving the second area RY in the excavated area R, and the main body 20X of the new structure 20 is reverse-discharged. Install. Specifically, first, a plurality of construction post piles 21 are constructed below the rooting bottom R1 of the first region RX, and the construction post columns 22 are driven on the respective construction post columns 21. Do.

次に、第一領域RXを所定深さまで掘削(一次掘削)し、新設構造物20(新設地上構造体20B)の本体部20Xの一階の梁24及び床スラブ26を施工する。なお、新設構造物20の本体部20Xの一階の梁24及び床スラブ26は、構真柱22で支持する。また、これらの梁24及び床スラブ26は、山留め壁30及び仮設山留め壁34を支持する山留め支保工として機能する。   Next, the first region RX is excavated to a predetermined depth (primary excavation), and the beam 24 and the floor slab 26 of the first floor of the main body 20X of the new structure 20 (newly constructed on-ground structure 20B) are constructed. Note that the beam 24 and the floor slab 26 on the first floor of the main body 20 </ b> X of the new structure 20 are supported by the structural pillar 22. Further, the beams 24 and the floor slab 26 function as a retaining support for supporting the retaining wall 30 and the temporary retaining wall 34.

次に、第一領域RXを所定深さまで掘削(二次掘削)し、新設地下構造体20Aの本体部20Xを順次施工する。また、新設地下構造体20Aの本体部20Xの施工と並行して、新設地上構造体20Bの本体部20Xを順次施工する。具体的には、複数の構真柱22上に、新設地上構造体20Bの本体部20Xの一階の柱22を施工するとともに、当該本体部20Xの二階の梁24及び床スラブ26を施工する。この手順を繰り返すことにより、新設構造物20の本体部20Xを施工する。   Next, the first region RX is excavated to a predetermined depth (secondary excavating), and the main body 20X of the new underground structure 20A is sequentially constructed. Further, in parallel with the construction of the main body portion 20X of the newly installed underground structure 20A, the main body portion 20X of the new ground structure 20B is sequentially constructed. Specifically, the pillars 22 of the first floor of the main body 20X of the new ground structure 20B are constructed on a plurality of structure columns 22 and the beams 24 and the floor slab 26 of the second floor of the main body 20X are constructed. . By repeating this procedure, the main body 20X of the new structure 20 is constructed.

(供用中地下構造物側施工工程)
次に、供用中地下構造物側施工工程について説明する。図4に示されるように、供用中地下構造物側施工工程では、掘削領域Rの第二領域RYを図示しない重機等によって掘削し、新設構造物20の外周部20Yを逆打ち工法によって施工する。
(In-service underground structure side construction process)
Next, the in-service underground structure side installation process will be described. As shown in FIG. 4, in the in-service underground structure side construction process, the second region RY of the excavation region R is excavated by a heavy machine or the like (not shown), and the outer peripheral portion 20Y of the new structure 20 is constructed by the reverse driving method. .

具体的には、第二領域RYを所定深さまで掘削(一次掘削)する。次に、新設構造物20(新設地上構造体20B)の外周部20Yの一階の梁24及び床スラブ26を施工する。なお、新設構造物20の本体部20Xの一階の梁24及び床スラブ26は、構真柱22で支持する。また、これらの梁24及び床スラブ26は、山留め壁30Aを支持する山留め支保工として機能する。   Specifically, the second region RY is excavated to a predetermined depth (primary excavation). Next, the beam 24 and the floor slab 26 of the first floor of the outer peripheral portion 20Y of the new structure 20 (newly installed above ground structure 20B) are constructed. Note that the beam 24 and the floor slab 26 on the first floor of the main body 20 </ b> X of the new structure 20 are supported by the structural pillar 22. Moreover, these beams 24 and the floor slab 26 function as a mountain retaining support that supports the mountain retaining wall 30A.

次に、第二領域RYを所定深さまで掘削(二次掘削)し、新設地下構造体20Aの外周部20Yを順次施工する。また、新設地下構造体20Aの外周部20Yの施工と並行して、新設地上構造体20Bの外周部20Yを順次施工する。具体的には、山留め壁30A及び構真柱22上に、新設地上構造体20Bの外周部20Yの一階の柱22を施工するとともに、当該外周部20Yの二階の梁24及び床スラブ26を施工する。この手順を繰り返すことにより、新設構造物20の外周部20Yを施工する。その後、仮設山留め壁34を撤去する。   Next, the second region RY is excavated to a predetermined depth (secondary excavating), and the outer peripheral portion 20Y of the new underground structure 20A is sequentially constructed. Further, in parallel with the construction of the outer peripheral portion 20Y of the new underground structure 20A, the outer peripheral portion 20Y of the new ground structure 20B is sequentially constructed. Specifically, the pillars 22 on the first floor of the outer peripheral portion 20Y of the new ground structure 20B are constructed on the retaining walls 30A and the steel pillars 22, and the beams 24 and the floor slab 26 on the second floor of the outer peripheral portion 20Y Install. By repeating this procedure, the outer peripheral portion 20Y of the new structure 20 is constructed. Thereafter, the temporary mountain retaining wall 34 is removed.

なお、供用中地下構造物側施工工程は、施工中の新設構造物20の本体部20Xの重量によって供用中地下構造物16の浮き上りを所定値以内に制限可能になった段階で実施可能であり、必ずしも新設構造物20の本体部20Xの完成を待つ必要はない。また、新設構造物20は、順打ち工法及び逆打ち工法の何れの工法によって施工可能である。さらに、図示を省略するが、山留め壁30の内側には、コンクリート地下外壁を適宜施工しても良い。   It should be noted that the construction process on the underground structure side during service can be carried out at a stage where the floating of the underground structure 16 during service can be limited to a predetermined value or less by the weight of the main body 20X of the new structure 20 under construction. There is no need to wait for the completion of the main body 20X of the new structure 20. In addition, the new structure 20 can be constructed by any of the forward striking method and the reverse striking method. Furthermore, although illustration is abbreviate | omitted, you may construct a concrete underground outer wall suitably in the inside of the mountain retaining wall 30. FIG.

(作用及び効果)
次に、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 effects of the present embodiment will be described.

例えば、図3に二点鎖線L1で示されるように、地盤12の掘削領域Rの全領域(第一領域RX及び第二領域RY)を一度に掘削すると、掘削領域Rの根切り底R1及びその周辺の地盤12が浮き上がる可能性がある。そして、掘削領域Rの周辺の地盤12が浮き上がると、供用中地下構造物16が浮き上がる可能性がある。   For example, as shown by a two-dot chain line L1 in FIG. 3, when the entire area (the first area RX and the second area RY) of the excavated area R of the ground 12 is excavated at one time, the rooted bottom R1 of the excavated area R and There is a possibility that the ground 12 around it may rise. And if the ground 12 around the excavation area R is lifted, the in-service underground structure 16 may be lifted.

この対策として、本実施形態では、先ず、一部施工工程において、地盤12の掘削領域Rのうち、供用中地下構造物16側の第二領域RYを残して第一領域RXを掘削し、新設構造物20の本体部20Xを施工する。   As a countermeasure for this, in the present embodiment, first, the first region RX is excavated leaving the second region RY on the side of the in-service underground structure 16 among the excavated regions R of the ground 12 in the partial construction process. The main body 20X of the structure 20 is constructed.

これにより、図3に二点鎖線L2で示されるように、掘削領域Rに残された第二領域RYの地盤12の重量によって、掘削領域R、及びその周辺の地盤12の浮き上がりが抑制される。さらに、掘削領域Rの第一領域RXに施工された新設構造物20の本体部20Xの重量によっても、掘削領域R、及びその周辺の地盤12の浮き上がりが抑制される。したがって、供用中地下構造物16の浮き上がりが抑制される。   As a result, as shown by a two-dot chain line L2 in FIG. 3, the weight of the ground 12 of the second region RY left in the excavation region R suppresses the floating of the excavation region R and the ground 12 around it. . Further, the weight of the main body 20X of the new structure 20 constructed in the first area RX of the excavation area R also suppresses the floating of the excavation area R and the ground 12 in the vicinity thereof. Therefore, the floating of the underground structure 16 in service is suppressed.

また、一部施工工程では、新設構造物20の本体部20Xを逆打ち工法によって施工する。これにより、掘削領域Rの第一領域RXを根切り底R1まで掘削してから、新設構造物20の本体部20Xを施工する場合(順打ち工法)と比較して、供用中地下構造物16の浮き上がりがさらに抑制される。   Moreover, in a part construction process, the main-body part 20X of the new structure 20 is constructed by a reverse operation method. Thereby, the first underground area RX of the excavation area R is excavated to the rooting bottom R1, and then the underground structure 16 is put in service in comparison with the case where the main body 20X of the new structure 20 is constructed (sequential casting method). Uplift is further suppressed.

さらに、一部施工工程において、掘削領域Rに仮設山留め壁34を仮設し、掘削領域Rを新設構造物20の本体部20Xが施工される第一領域RXと、新設構造物20の外周部20Yが施工される第二領域RYとに仮設山留め壁34で仕切った状態で、掘削領域Rの第一領域RXを掘削する。これにより、掘削領域Rの第二領域RYに先行して、第一領域RXを容易に掘削することができる。   Furthermore, in the partial construction process, a temporary retaining wall 34 is temporarily provided in the excavated area R, and the excavated area R is a first area RX in which the main body 20X of the new structure 20 is to be constructed. The first region RX of the drilling region R is excavated in a state of being partitioned by the temporary retaining wall 34 into a second region RY to be constructed. Thereby, prior to the second region RY of the excavation region R, the first region RX can be easily excavated.

次に、供用中地下構造物側施工工程では、掘削領域Rに残された第二領域RYの地盤12を掘削し、新設構造物20の外周部20Yを施工する。この供用中地下構造物側施工工程では、新設構造物20の外周部20Yが施工されるまでは、新設構造物20の本体部20Xの重量によって、掘削領域R、及びその周辺の地盤12の浮き上がりが抑制される。したがって、供用中地下構造物16の浮き上がりが抑制される。   Next, in the in-service underground structure side construction process, the ground 12 in the second region RY remaining in the excavation region R is excavated, and the outer peripheral portion 20Y of the new structure 20 is constructed. In the in-service underground structure side construction step, the excavated region R and the surrounding ground 12 rise due to the weight of the main body portion 20X of the new structure 20 until the outer peripheral portion 20Y of the new structure 20 is constructed. Is suppressed. Therefore, the floating of the underground structure 16 in service is suppressed.

さらに、本実施形態では、供用中地下構造物側施工工程において、新設構造物20の外周部20Yを逆打ち工法によって施工する。これにより、掘削領域Rの第二領域RYを根切り底R1(図2参照)まで掘削してから、新設構造物20の外周部20Yを施工する場合(順打ち工法)と比較して、供用中地下構造物16の浮き上がりがさらに抑制される。   Furthermore, in the present embodiment, in the in-service underground structure side construction step, the outer peripheral portion 20Y of the new structure 20 is constructed by the reverse driving method. In this way, the second area RY of the excavation area R is excavated to the rooting bottom R1 (see FIG. 2), and then serviced compared to the case where the outer peripheral portion 20Y of the new structure 20 is constructed (forward casting method) The floating of the underground structure 16 is further suppressed.

(第二実施形態)
次に、第二実施形態について説明する。なお、第二実施形態において、第一実施形態と同じ構成の部材等には、同符号を付して説明を適宜省略する。
Second Embodiment
Next, a second embodiment will be described. Note that in the second embodiment, members having the same configuration as in the first embodiment are denoted by the same reference numerals, and description thereof is omitted as appropriate.

図5に示されるように、本実施形態に係る構造物の施工方法は、供用中地下構造物16及び既設構造物40が設けられた地盤12に適用される。既設構造物40は、既設地下構造体40A及び既設地上構造体40Bを有している。また、既設構造物40は、複数の柱42と、隣り合う柱42に架設される梁44と、梁44に支持される床スラブ46とを有して構成される。   As shown in FIG. 5, the construction method of the structure according to the present embodiment is applied to the ground 12 provided with the in-service underground structure 16 and the existing structure 40. The existing structure 40 has an existing underground structure 40A and an existing ground structure 40B. The existing structure 40 includes a plurality of columns 42, beams 44 installed on adjacent columns 42, and a floor slab 46 supported by the beams 44.

既設地下構造体40Aは、平面視にて供用中地下構造物16と隣り合って配置されている。この既設地下構造体40Aの上には、既設地上構造体40Bが設けられている。なお、既設構造物40は、少なくとも既設地下構造体40Aを有していれば良く、既設地上構造体40Bは省略されても良い。   The existing underground structure 40A is disposed adjacent to the in-service underground structure 16 in plan view. An existing ground structure 40B is provided on the existing underground structure 40A. In addition, the existing structure 40 should just have the existing underground structure 40A at least, and the existing ground structure 40B may be abbreviate | omitted.

(構造物の施工方法)
次に、本実施形態に係る構造物の施工方法の一例について説明する。
(Construction method of structure)
Next, an example of the construction method of the structure according to the present embodiment will be described.

本実施形態に係る構造物の施工方法では、既設構造物40を解体して新設構造物20を構築する。つまり、本実施形態に係る構造物の施工方法は、既設構造物40の建て替え時に使用される。この際、本実施形態では、先ず、既設構造物40の供用中地下構造物16側の外周部40Yを残して、外周部40Y以外の本体部40Xを建て替える。その後、既設構造物40の外周部40Yを建て替える。これにより、供用中地下構造物16の浮き上がりを抑制する。   In the construction method of a structure according to the present embodiment, the existing structure 40 is disassembled to construct a new structure 20. That is, the construction method of the structure according to the present embodiment is used when rebuilding the existing structure 40. At this time, in the present embodiment, first, the main body portion 40X other than the outer peripheral portion 40Y is rebuilt, leaving the outer peripheral portion 40Y on the in-service underground structure 16 side of the existing structure 40. Thereafter, the outer peripheral portion 40Y of the existing structure 40 is rebuilt. Thereby, the floating of the in-service underground structure 16 is suppressed.

また、本実施形態では、新設地下構造体20Aの深さが、既設地下構造体40Aの深さよりも浅い。そのため、新設地下構造体20Aよりも深い既設地下構造体40Aの部位(下部40L)は解体せず、新設地下構造体20Aの基礎として使用する。以下、本実施形態に係る構造物の施工方法を具体的に説明する。   In the present embodiment, the depth of the newly installed underground structure 20A is shallower than the depth of the existing underground structure 40A. Therefore, the site | part (lower part 40L) of the existing underground structure 40A deeper than the newly installed underground structure 20A is not disassembled, but is used as the foundation of the newly installed underground structure 20A. Hereinafter, the construction method of the structure concerning this embodiment is explained concretely.

(一部施工工程)
先ず、一部施工工程について説明する。図6に示されるように、一部施工工程では、先ず、既設地下構造体40Aの外周に山留め壁30を施工する。次に、解体される(解体予定の)既設地下構造体40Aの各階に仮設仕切壁48を施工する。
(Part construction process)
First, a partial construction process will be described. As shown in FIG. 6, in the partial construction process, first, the mountain retaining wall 30 is constructed on the outer periphery of the existing underground structure 40A. Next, temporary partition walls 48 are constructed on each floor of the existing underground structure 40A to be disassembled (to be disassembled).

なお、山留め壁30は省略し、既設地下構造体40Aの地下外壁40Wを山留め壁として利用することも可能である。   Note that the retaining wall 30 may be omitted, and the underground outer wall 40W of the existing underground structure 40A may be used as the retaining wall.

仮設仕切壁48は、例えば、コンクリート壁や鋼製壁とされており、既設地下構造体40Aの供用中地下構造物16側に配置される。この仮設仕切壁48によって、既設地下構造体40Aを、供用中地下構造物16側の外周部40Yと、外周部40Y以外の本体部40Xとに仕切る。   The temporary partition wall 48 is, for example, a concrete wall or a steel wall, and is disposed on the in-service underground structure 16 side of the existing underground structure 40A. The temporary partition wall 48 partitions the existing underground structure 40A into an outer peripheral portion 40Y on the in-service underground structure 16 side and a main body portion 40X other than the outer peripheral portion 40Y.

なお、既設地下構造体40Aの本体部40Xは、新設構造物20の本体部20Xが施工される領域とされる。また、既設地下構造体40Aの外周部40Yは、新設構造物20の外周部20Yが施工される領域とされる。また、既設地下構造体40Aの外周部40Yは、既設地下構造体の供用中地下構造物側の一例である。   The main body 40X of the existing underground structure 40A is an area where the main body 20X of the new structure 20 is constructed. Further, the outer peripheral portion 40Y of the existing underground structure 40A is an area where the outer peripheral portion 20Y of the new structure 20 is constructed. Further, the outer peripheral portion 40Y of the existing underground structure 40A is an example of the existing underground structure on the side of the in-service underground structure.

次に、図7に示されるように、既設構造物40のうち、外周部40Yを残して本体部40Xを図示しない重機等によって解体し、新設構造物20の本体部20Xを施工する。   Next, as shown in FIG. 7, the main body 40X of the existing structure 40 is disassembled by a heavy machine or the like (not shown) except for the outer peripheral portion 40Y, and the main body 20X of the new structure 20 is constructed.

具体的には、既設地下構造体40Aの下部40Lを残して所定深さまで解体する。そして、残された既設地下構造体40Aの下部40L上に新設地下構造体20A及び新設地上構造体20Bの柱22、梁24、及び床スラブ26等を施工する。つまり、残された既設地下構造体40Aの下部40Lを新設構造物20の基礎として使用する。なお、残された既設地下構造体40Aの下部40Lは、新設構造物20の基礎として使用しない場合もある。   Specifically, the lower portion 40L of the existing underground structure 40A is left until it is disassembled to a predetermined depth. Then, on the lower portion 40L of the remaining existing underground structure 40A, the new underground structure 20A and the pillars 22, the beams 24, the floor slab 26 and the like of the new ground structure 20B are constructed. That is, the lower portion 40L of the remaining existing underground structure 40A is used as the basis of the new structure 20. The remaining lower part 40L of the existing underground structure 40A may not be used as the foundation of the new structure 20 in some cases.

なお、新設構造物20の本体部20Xは、新設構造物の一部の一例である。また、新設構造物20の外周部20Yは、新設構造物における供用中地下構造物側の一例である。   The main body 20X of the new structure 20 is an example of a part of the new structure. Moreover, the outer peripheral part 20Y of the new structure 20 is an example of the in-service underground structure side in the new structure.

また、一部施工工程では、既設構造物40の外周部40Yの各階に、例えば、既設構造物40の本体部40Xの解体ガラ50を充填する。これにより、供用中地下構造物16の浮き上がりが抑制される。なお、解体ガラ50は、適宜省略可能である。   Further, in the partial construction process, each floor of the outer peripheral portion 40Y of the existing structure 40 is filled with, for example, the disassembling glass 50 of the main body portion 40X of the existing structure 40. Thereby, floating of the underground structure 16 in service is suppressed. Note that the disassembling glass 50 can be omitted as appropriate.

(供用中地下構造物側施工工程)
次に、供用中地下構造物側施工工程について説明する。供用中地下構造物側施工工程では、図示を省略するが、既設構造物40の外周部40Yを図示しない重機等によって解体し、新設構造物20の外周部20Yを逆打ち工法によって施工する。その後、仮設仕切壁48を撤去する。
(In-service underground structure side construction process)
Next, the in-service underground structure side installation process will be described. In the in-service underground structure side construction process, although not shown, the outer peripheral portion 40Y of the existing structure 40 is disassembled by a heavy machine or the like (not shown), and the outer peripheral portion 20Y of the new structure 20 is constructed by a reverse driving method. Thereafter, the temporary partition wall 48 is removed.

また、供用中地下構造物側施工工程は、施工中の新設構造物20の本体部20Xの重量によって供用中地下構造物16の浮き上りを所定値以内に制限可能になった段階で実施可能であり、必ずしも新設構造物20の本体部20Xの完成を待つ必要はない。   In addition, the construction process on the underground structure side during service can be carried out at a stage where the floating of the underground structure 16 during service can be limited within a predetermined value by the weight of the main body 20X of the new structure 20 under construction. There is no need to wait for the completion of the main body 20X of the new structure 20.

なお、新設構造物20は、順打ち工法及び逆打ち工法の何れの工法によって施工可能である。また、図示を省略するが、山留め壁30の内側には、コンクリート地下外壁を適宜施工しても良い。   In addition, the new structure 20 can be constructed by any method of the forward striking method and the reverse striking method. Moreover, although illustration is abbreviate | omitted, you may construct a concrete underground outer wall suitably inside the mountain retaining wall 30. As shown in FIG.

(作用及び効果)
次に、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 effects of the present embodiment will be described.

本実施形態に係る構造物の施工方法によれば、先ず、一部施工工程において、既設構造物40を、供用中地下構造物16側の外周部40Yを残して解体し、供用中地下構造物側施工工程において、新設構造物20の外周部20Yを施工する。   According to the construction method of the structure according to the present embodiment, first, in the partial construction process, the existing structure 40 is disassembled leaving the outer peripheral portion 40Y on the in-service underground structure 16 side, and the underground structure in service In the side construction process, the outer peripheral portion 20Y of the new structure 20 is constructed.

これにより、残された既設地下構造体40Aの外周部40Yの重量によって、既設地下構造体40Aの解体領域、及びその周辺の地盤12の浮き上がりが抑制される。さらに、供用中地下構造物側施工工程において施工された新設構造物20の外周部20Yの重量によっても、既設地下構造体40Aの解体領域、及びその周辺の地盤12の浮き上がりが抑制される。したがって、供用中地下構造物16の浮き上がりが抑制される。   Thereby, the dismantling area | region of 40 A of existing underground structures, and the floating of the surrounding ground 12 are suppressed by the weight of the outer peripheral part 40Y of 40 A of existing underground structures left. Further, the weight of the outer peripheral portion 20Y of the new structure 20 constructed in the in-service underground structure side construction process also suppresses the lifting up of the dismantled area of the existing underground structure 40A and the ground 12 around it. Therefore, the floating of the underground structure 16 in service is suppressed.

また、一部施工工程において、新設構造物20の本体部20Xを逆打ち工法によって施工する。これにより、既設構造物40の本体部40Xの下部40L以浅を解体してから、新設構造物20の本体部20Xを施工する場合(順打ち工法)と比較して、供用中地下構造物16の浮き上がりがさらに抑制される。   Further, in a part of the construction process, the main body 20X of the new structure 20 is constructed by the reverse operation method. Thereby, after disassembling the lower part 40L of the main body part 40X of the existing structure 40, compared with the case of constructing the main body part 20X of the new structure 20 (ordered construction method), the in-service underground structure 16 Uplift is further suppressed.

さらに、一部施工工程では、既設構造物40の外周部40Yの各階に解体ガラ50を充填している。これにより、供用中地下構造物16の浮き上がりがさらに抑制される。   Further, in some construction steps, each floor of the outer peripheral portion 40Y of the existing structure 40 is filled with the dismantling glass 50. Thereby, the floating of the underground structure 16 in service is further suppressed.

また、一部施工工程において、既設地下構造体40Aに仮設仕切壁48を仮設し、既設地下構造体40Aを外周部40Yと本体部40Xとに仕切った状態で、既設地下構造体40Aの本体部40Xを解体する。これにより、既設構造物40の外周部40Yに先行して、既設構造物40の本体部40Xを容易に解体することができる。   Further, in a part of the construction process, temporary partition walls 48 are temporarily provided on the existing underground structure 40A, and the existing underground structure 40A is divided into the outer peripheral portion 40Y and the main body 40X, the main body portion of the existing underground structure 40A Dismantle 40X. Thereby, the main body 40X of the existing structure 40 can be easily disassembled prior to the outer peripheral portion 40Y of the existing structure 40.

次に、供用中地下構造物側施工工程では、残された既設構造物40の外周部40Yを解体し、新設構造物20の外周部20Yを施工する。この供用中地下構造物側施工工程では、新設構造物20の外周部20Yが施工されるまでは、新設構造物20の本体部20Xによって、既設構造物40の外周部40Yの解体領域、及びその周辺の地盤12の浮き上がりが抑制される。したがって、供用中地下構造物16の浮き上がりが抑制される。   Next, in the in-service underground structure side construction process, the outer peripheral portion 40Y of the remaining existing structure 40 is disassembled, and the outer peripheral portion 20Y of the new structure 20 is constructed. In this in-service underground structure side construction step, the main body 20X of the new structure 20 disassembles the outer peripheral portion 40Y of the existing structure 40 and the structure until the outer periphery 20Y of the new structure 20 is constructed. Uplift of the surrounding ground 12 is suppressed. Therefore, the floating of the underground structure 16 in service is suppressed.

また、供用中地下構造物側施工工程において、新設構造物20の外周部20Yを逆打ち工法によって施工する。これにより、既設構造物40の外周部40Yの下部40L以浅を解体してから、新設構造物20の外周部20Yを施工する場合(順打ち工法)と比較して、供用中地下構造物16の浮き上がりがさらに抑制される。   Moreover, in the in-service underground structure side construction process, the outer peripheral portion 20Y of the new structure 20 is constructed by the reverse driving method. As a result, compared to the case where the outer peripheral portion 20Y of the new structure 20 is constructed after dismantling the lower portion 40L of the outer peripheral portion 40Y of the existing structure 40, the in-service underground structure 16 is in service. Uplift is further suppressed.

(第二実施形態の変形例)
次に、第二実施形態の変形例について説明する。
(Modification of the second embodiment)
Next, a modification of the second embodiment will be described.

図8に示される変形例では、新設地下構造体20Aの深さが、既設地下構造体40Aの深さよりも深い。この場合は、既設地下構造体40Aに仮設仕切壁48を仮設し、既設地下構造体40Aを外周部40Yと本体部40Xとに仕切る。また、既設地下構造体40Aよりも深い地盤12に仮設山留め壁52を仮設し、掘削領域Rを第二領域RYと第一領域RXとに仕切る。これにより、新設地下構造体20Aの外周部20Yに先行して、新設地下構造体20Aの本体部20Xを容易に施工することができる。   In the modification shown in FIG. 8, the depth of the new underground structure 20A is deeper than the depth of the existing underground structure 40A. In this case, the temporary partition wall 48 is temporarily installed in the existing underground structure 40A, and the existing underground structure 40A is partitioned into the outer peripheral portion 40Y and the main body portion 40X. Further, a temporary mountain retaining wall 52 is temporarily installed on the ground 12 deeper than the existing underground structure 40A, and the excavation area R is divided into a second area RY and a first area RX. Thereby, the main body 20X of the new underground structure 20A can be easily constructed prior to the outer peripheral part 20Y of the new underground structure 20A.

なお、仮設仕切壁48及び仮設山留め壁52は、例えば、地中連続壁(コンクリート壁)や、地盤改良壁(ソイルセメント壁)、親杭横矢板等の鋼製壁によって形成されても良い。   The temporary partition wall 48 and the temporary retaining wall 52 may be formed of, for example, a steel continuous wall (concrete wall), a ground improvement wall (soil cement wall), or a steel wall such as a parent pile horizontal sheet pile.

(第一及び第二実施形態の変形例)
次に、上記第一実施形態及び第二実施形態の変形例について説明する。なお、以下では、上記第一実施形態を例に各種の変形例について説明するが、これらの変形例は、第二実施形態にも適宜適用可能である。
(Modification of the first and second embodiments)
Next, modified examples of the first embodiment and the second embodiment will be described. In the following, various modified examples will be described by taking the first embodiment as an example, but these modified examples are also applicable to the second embodiment as appropriate.

図9に示される変形例のように、一部施工工程では、新設構造物20の本体部20Xだけでなく、新設構造物20の外周部20Yの一階の梁24及び床スラブ26を施工することも可能である。これにより、新設構造物20の外周部20Yに工事車両等の通路を確保し易くなる。   As in the modified example shown in FIG. 9, in the partial construction process, not only the main body 20X of the new structure 20 but also the first floor beam 24 and the floor slab 26 of the outer periphery 20Y of the new structure 20 are constructed. It is also possible. Thereby, it becomes easy to secure a passage such as a construction vehicle in the outer peripheral portion 20Y of the new structure 20.

また、図10に示される変形例のように、供用中地下構造物側施工工程において、新設地下構造体20Aの外周部20Yに錘としての水槽60を仮設しても良い。これにより、供用中地下構造物16の浮上りをさらに抑制することができる。また、錘として水槽60を用いることにより、搬入及び撤去が容易となる。   Further, as in the modification example shown in FIG. 10, a water tank 60 as a weight may be temporarily installed on the outer peripheral portion 20 </ b> Y of the newly installed underground structure 20 </ b> A in the in-service underground structure side construction process. Thereby, the floating of the in-service underground structure 16 can be further suppressed. Moreover, carrying in and removal becomes easy by using the water tank 60 as a weight.

なお、新設地下構造体20Aの外周部20Yには、少なくとも一つの水槽60を設置することができる。また、錘は、水槽60に限らず、他の部材を用いても良い。   In addition, at least one water tank 60 can be installed in the outer peripheral portion 20Y of the new underground structure 20A. The weight is not limited to the water tank 60, and other members may be used.

また、図11に示される変形例のように、供用中地下構造物側施工工程において、ジャッキ64が設けられた切り梁62によって、山留め壁30Aを支持しても良い。この場合、ジャッキ64を伸張させることにより、山留め壁30Aの倒れをより確実に抑制することができる。   Further, as in the modification shown in FIG. 11, the mountain retaining wall 30 </ b> A may be supported by the cut beam 62 provided with the jack 64 in the in-service underground structure side construction process. In this case, by extending the jack 64, the fall of the mountain retaining wall 30A can be more reliably suppressed.

また、図12に示される変形例のように、供用中地下構造物側施工工程において、施工済みの新設構造物20の外周部20Yと新設構造物20の本体部20Xとを少なくとも一本の仮設斜梁66によって連結しても良い。各仮設斜梁66は、新設構造物20の本体部20Xに反力を取って新設構造物20の外周部20Yの浮上りを抑制する。したがって、供用中地下構造物16の浮上りが抑制される。   Further, as in the modification shown in FIG. 12, in the in-service underground structure side construction process, at least one temporary installation of the outer peripheral portion 20Y of the new construction 20 completed and the main body 20X of the new construction 20 It may be connected by a diagonal beam 66. Each temporary diagonal beam 66 exerts a reaction force on the main body portion 20X of the new structure 20 to suppress the floating of the outer peripheral portion 20Y of the new structure 20. Therefore, the floating of the underground structure 16 in service is suppressed.

また、仮設斜梁66には、ジャッキ68が設けられている。このジャッキ68を伸張させることにより、新設地下構造体20Aの外周部20Y、及び供用中地下構造物16の浮き上りをさらに抑制することができる。   In addition, a jack 68 is provided on the temporary diagonal beam 66. By extending this jack 68, the floating of the outer peripheral portion 20Y of the new underground structure 20A and the floating underground structure 16 can be further suppressed.

また、上記第一実施形態では、新設構造物20の外周部20Yは、供用中地下構造物16及び新設構造物20を含む縦断面において、新設構造物20の供用中地下構造物16側の1スパン部分とされる。しかしながら、新設構造物20の外周部は、例えば、供用中地下構造物16及び新設構造物20を含む縦断面において、供用中地下構造物16側の1スパン部分以上(複数スパン部分)とされても良い。   Further, in the first embodiment, in the longitudinal section including the in-service underground structure 16 and the new structure 20, the outer peripheral portion 20Y of the new structure 20 is 1 on the in-service underground structure 16 side of the new structure 20. It is a span part. However, the outer peripheral portion of the new structure 20 is, for example, one span portion or more (a plurality of span portions) on the in-service underground structure 16 side in the longitudinal cross section including the in-service underground structure 16 and the new structure 20 Also good.

また、上記第一実施形態では、供用中地下構造物16が新設構造物20の片側にのみ配置されるが、上記第一実施形態はこれに限らない。供用中地下構造物は、例えば、新設構造物(構造物)の周囲に複数配置されていても良い。この場合、一部施工工程では、例えば、新設地下構造体用の掘削領域を、複数の供用中地下構造物側をそれぞれ残して掘削する。   Moreover, in the said 1st embodiment, although the underground structure 16 in service is arrange | positioned only on one side of the new structure 20, the said 1st embodiment is not restricted to this. A plurality of in-service underground structures may be disposed around the new structure (structure), for example. In this case, in the partial construction process, for example, excavating regions for the new underground structure are excavated leaving the plurality of in-service underground structures side respectively.

以上、本発明の一実施形態について説明したが、本発明はこうした実施形態に限定されるものでなく、一実施形態及び各種の変形例を適宜組み合わせて用いても良いし、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勿論である。   As mentioned above, although one embodiment of the present invention was described, the present invention is not limited to such an embodiment, and one embodiment and various modifications may be used in combination as appropriate, and the gist of the present invention will be described. Of course, various modifications can be made without departing from the scope of the invention.

16 供用中地下構造物
20 新設構造物(構造物)
20A 新設地下構造体
20X 本体部(新設地下構造体の一部)
20Y 外周部(新設地下構造体における供用中地下構造物側)
34 仮設山留め壁
40A 既設地下構造体
40X 本体部(既設地下構造体の一部)
40Y 外周部(既設地下構造体の供用中地下構造物側)
R 掘削領域
RX 第一領域(掘削領域の第一領域)
RY 第二領域(掘削領域の第二領域)
16 In-service underground structure 20 New structure (structure)
20A New underground structure 20X main body (part of new underground structure)
20Y Outer peripheral part (in-service underground structure side in new underground structure)
34 Temporary retaining wall 40A Existing underground structure 40X Main body (part of existing underground structure)
40Y outer periphery (in-service underground structure side of the existing underground structure)
R drilling area RX first area (first area of drilling area)
RY second area (second area of drilling area)

Claims (3)

平面視にて供用中地下構造物と隣り合う新設地下構造体を有する構造物を施工する構造物の施工方法であって、
前記新設地下構造体用の掘削領域を、前記供用中地下構造物側を残して掘削し、前記新設地下構造体の一部を施工する一部施工工程と、
残された前記掘削領域の前記供用中地下構造物側を掘削し、前記新設地下構造体における前記供用中地下構造物側を施工する供用中地下構造物側施工工程と、
を備える構造物の施工方法。
A construction method for constructing a structure having a new underground structure adjacent to the in-service underground structure in plan view,
A partial construction process of excavating the excavation area for the new underground structure leaving the in-service underground structure side and constructing a part of the new underground structure;
Excavating the in-service underground structure side of the remaining excavation area, and constructing the in-service underground structure side construction step in the new underground structure,
A construction method for a structure comprising:
前記一部施工工程において、前記掘削領域を前記新設地下構造体の前記一部が施工される第一領域と、前記新設地下構造体における前記新設地下構造体側が施工される第二領域とに仮設山留め壁で仕切った状態で、前記第一領域を掘削する、
請求項1に記載の構造物の施工方法。
In the partial construction step, the excavation area is temporarily set in a first area where the part of the newly installed underground structure is constructed and a second area where the newly installed underground structure side is constructed in the newly installed underground structure. The first area is excavated in a state of being divided by a retaining wall.
The construction method of the structure of Claim 1.
平面視にて供用中地下構造物と隣り合う既設地下構造体を解体し、新設地下構造体を有する構造物を施工する構造物の施工方法であって、
前記既設地下構造体を、前記供用中地下構造物側を残して解体し、前記新設地下構造体の一部を施工する一部施工工程と、
残された前記既設地下構造体の前記供用中地下構造物側を解体し、前記新設地下構造体における前記供用中地下構造物側を施工する供用中地下構造物側施工工程と、
を備える構造物の施工方法。
A construction method of a structure for disassembling an existing underground structure adjacent to the underground structure in service in plan view, and constructing a structure having a new underground structure,
A partial construction process of dismantling the existing underground structure leaving the in-service underground structure side and constructing a part of the new underground structure;
The in-service underground structure side construction step of dismantling the in-service underground structure side of the remaining existing underground structure and constructing the in-service underground structure side in the newly installed underground structure;
A construction method for a structure comprising:
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