JP2018188874A - Earth retaining structure and construction method of the same - Google Patents
Earth retaining structure and construction method of the same Download PDFInfo
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Abstract
Description
本発明は、開削工事などで用いられる土留め構造およびこの土留め構造の施工方法に関するものである。 The present invention relates to a retaining structure used in excavation work and the like, and a construction method of the retaining structure.
従来、土木分野の開削工事では、土留め壁と切梁を用いて地山の変状を抑制しながら地盤の掘削を行っている（例えば、特許文献１、２を参照）。しかし、掘削幅が広く、かつ中間杭が打設できずにスパンが大きくなるような場合、通常のＨ鋼を用いた切梁では部材の耐力が不足するため、切梁をトラス構造に組み立てたトラス切梁を用いることがある。 Conventionally, in excavation work in the field of civil engineering, excavation of the ground is performed while suppressing deformation of the natural ground using earth retaining walls and cut beams (see, for example, Patent Documents 1 and 2). However, when the excavation width is wide and the span is large because the intermediate pile cannot be driven, the pierced beam using normal H steel has insufficient strength of the member. A truss beam may be used.
Ｈ鋼を用いた切梁の場合、土留め壁の変形を抑制するために通常、油圧ジャッキを切梁の途中に設置してプレロードを導入することが多い（例えば、特許文献３を参照）。しかし、トラス切梁の場合には、油圧ジャッキを切梁の途中に設置してプレロードを導入すると、トラス形状の変化により接合部に力が作用してジャッキ設置部分が弱点となることから、プレロードを導入できない。このように通常の方法では、トラス切梁にプレロードを導入できないため、切梁のゆるみによる変形が増大するおそれがある。また、設計を行う場合には、切梁のゆるみを考慮して切梁バネ値を低減する必要があり、設計に手間が掛かるおそれがある。 In the case of a cut beam using H steel, a preload is often introduced by installing a hydraulic jack in the middle of the cut beam in order to suppress deformation of the retaining wall (see, for example, Patent Document 3). However, in the case of truss cutting beams, if a hydraulic jack is installed in the middle of the cutting beam and a preload is introduced, a force is applied to the joint due to changes in the shape of the truss and the jack installation part becomes a weak point. Cannot be introduced. As described above, in the normal method, since a preload cannot be introduced into the truss beam, deformation due to loosening of the beam may increase. Further, when designing, it is necessary to reduce the beam spring value in consideration of the looseness of the beam, which may take time and effort.
このため、トラス切梁にプレロードを導入することのできる土留め構造が求められていた。 For this reason, the earth retaining structure which can introduce a preload to a truss beam was calculated | required.
本発明は、上記に鑑みてなされたものであって、トラス切梁にプレロードを導入可能な土留め構造および施工方法を提供することを目的とする。 This invention is made | formed in view of the above, Comprising: It aims at providing the earth retaining structure and construction method which can introduce a preload to a truss beam.
上記した課題を解決し、目的を達成するために、本発明に係る土留め構造は、掘削対象領域を挟んで左右に設置される土留め壁と、土留め壁に設置される腹起しと、左右の腹起しの間に架設される切梁とを備えた土留め構造であって、前記切梁は、上下方向に間隔をあけて設けられてそれぞれ左右方向に延在する上段切梁および下段切梁と、上段切梁および下段切梁の間に架設され、これらを斜めに連結する斜材とを有するトラス構造の切梁であり、上段切梁および下段切梁の端部における腹起しと土留め壁との間、または、上段切梁および下段切梁の端部と腹起しとの間に、上段切梁および下段切梁にプレロードを導入するための薄型のジャッキ装置が設けられていることを特徴とする。 In order to solve the above-described problems and achieve the object, the earth retaining structure according to the present invention includes an earth retaining wall installed on the left and right sides of the excavation target area, and an abdomen installed on the earth retaining wall. An earth retaining structure provided with a cut beam erected between the left and right erections, the cut beam being provided at intervals in the vertical direction and extending in the left and right directions respectively. And a lower truss beam, and a truss-structured truss beam that is installed between the upper and lower cut beams and diagonally connecting them diagonally, and is formed at the ends of the upper and lower cut beams. A thin jack device is installed between the raised wall and the retaining wall, or between the ends of the upper and lower beams and the belly, to introduce the preload to the upper and lower beams. It is characterized by being.
また、本発明に係る他の土留め構造は、上述した発明において、前記ジャッキ装置がフラットジャッキであることを特徴とする。 Another earth retaining structure according to the present invention is characterized in that, in the above-described invention, the jack device is a flat jack.
また、本発明に係る土留め構造の施工方法は、上述した土留め構造を施工する方法であって、上段切梁の端部における腹起しと土留め壁との間、または、上段切梁の端部と腹起しとの間に、前記ジャッキ装置を設置して、この前記ジャッキ装置により上段切梁にプレロードを導入する工程と、上段切梁にプレロードを導入した後、下段切梁を設置可能な深さまで掘削対象領域を掘削する工程と、下段切梁の端部における腹起しと土留め壁との間、または、下段切梁の端部と腹起しとの間に、前記ジャッキ装置を設置して、この前記ジャッキ装置により下段切梁にプレロードを導入する工程と、上段切梁と下段切梁の間に斜材を設置して切梁全体をトラス構造にする工程とを備えることを特徴とする。 Moreover, the construction method of the earth retaining structure according to the present invention is a method for constructing the earth retaining structure described above, and is between the bellows at the end of the upper stage beam and the earth retaining wall, or the upper stage beam. The jack device is installed between the end of the head and the abdomen, a step of introducing a preload to the upper stage beam by the jack device, and a lower stage beam is installed after introducing the preload to the upper stage beam. The jack device includes a step of excavating a region to be excavated to a possible depth, and between the bulge and the retaining wall at the end of the lower cut beam, or between the end of the lower cut beam and the bulge. And a step of introducing a preload to the lower beam by the jack device, and a step of installing a diagonal member between the upper beam and the lower beam to make the entire beam a truss structure. It is characterized by.
本発明に係る土留め構造によれば、掘削対象領域を挟んで左右に設置される土留め壁と、土留め壁に設置される腹起しと、左右の腹起しの間に架設される切梁とを備えた土留め構造であって、前記切梁は、上下方向に間隔をあけて設けられてそれぞれ左右方向に延在する上段切梁および下段切梁と、上段切梁および下段切梁の間に架設され、これらを斜めに連結する斜材とを有するトラス構造の切梁であり、上段切梁および下段切梁の端部における腹起しと土留め壁との間、または、上段切梁および下段切梁の端部と腹起しとの間に、上段切梁および下段切梁にプレロードを導入するための薄型のジャッキ装置が設けられているので、トラス切梁にプレロードを導入可能な土留め構造を提供することができるという効果を奏する。 According to the earth retaining structure according to the present invention, the earth retaining wall installed on the left and right sides of the excavation target area, the belly erection installed on the earth retaining wall, and the right and left belly erection are installed. An earth retaining structure provided with a cutting beam, the cutting beam being provided with an interval in the vertical direction and extending in the left and right directions, respectively, and an upper cutting beam and a lower cutting beam. A truss-structured cut beam that is installed between the beams and has diagonal members that connect them diagonally, and between the bulge and the retaining wall at the ends of the upper and lower cut beams, or A thin jack device is installed between the ends of the upper and lower beams and the ridges to introduce the preload to the upper and lower beams. There is an effect that a possible earth retaining structure can be provided.
また、本発明に係る他の土留め構造によれば、前記ジャッキ装置がフラットジャッキであるので、フラットジャッキによってトラス切梁にプレロードを容易に導入することができるという効果を奏する。 In addition, according to another earth retaining structure according to the present invention, since the jack device is a flat jack, it is possible to easily introduce a preload to the truss beam by the flat jack.
また、本発明に係る土留め構造の施工方法によれば、上述した土留め構造を施工する方法であって、上段切梁の端部における腹起しと土留め壁との間、または、上段切梁の端部と腹起しとの間に、前記ジャッキ装置を設置して、この前記ジャッキ装置により上段切梁にプレロードを導入する工程と、上段切梁にプレロードを導入した後、下段切梁を設置可能な深さまで掘削対象領域を掘削する工程と、下段切梁の端部における腹起しと土留め壁との間、または、下段切梁の端部と腹起しとの間に、前記ジャッキ装置を設置して、この前記ジャッキ装置により下段切梁にプレロードを導入する工程と、上段切梁と下段切梁の間に斜材を設置して切梁全体をトラス構造にする工程とを備えるので、トラス切梁にプレロードを導入可能な土留め構造の施工方法を提供することができるという効果を奏する。 Further, according to the construction method of the earth retaining structure according to the present invention, it is a method for constructing the earth retaining structure described above, and between the erection and the earth retaining wall at the end of the upper stage beam, or the upper stage. The step of installing the jack device between the end of the beam and the erection and introducing the preload to the upper beam by the jack device, and introducing the preload to the upper beam, the lower beam Digging the drilling target area to a depth where it can be installed, and between the bulge and the retaining wall at the end of the lower cut beam, or between the end of the lower cut beam and the bulge A step of installing a jack device and introducing a preload to the lower beam by the jack device; and a step of installing a diagonal member between the upper beam and the lower beam to make the entire beam a truss structure. Earth retaining structure that can introduce preload to truss beam An effect that it is possible to provide a construction method.
以下に、本発明に係る土留め構造および施工方法の実施の形態を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。 Hereinafter, embodiments of the earth retaining structure and construction method according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.
（土留め構造）
まず、本発明に係る土留め構造の実施の形態について説明する。
(Retaining structure)
First, an embodiment of the earth retaining structure according to the present invention will be described.
図１に示すように、本実施の形態に係る土留め構造１０は、掘削対象領域Ｒを挟んで左右の地山Ｇに設置される土留め壁１２と、土留め壁１２に設置される腹起し１４と、左右の腹起し１４の間に架設されるトラス切梁１６（切梁）と、フラットジャッキ１８（ジャッキ装置）とを備えている。 As shown in FIG. 1, the earth retaining structure 10 according to the present embodiment includes an earth retaining wall 12 installed on the left and right grounds G across the excavation target region R, and an belly installed on the earth retaining wall 12. A raising 14, a truss cutting beam 16 (cutting beam) installed between the left and right belly raising 14, and a flat jack 18 (jacking device) are provided.
本実施の形態の土留め壁１２は、例えば親杭横矢板壁、鋼矢板壁、柱列式連続壁などの周知の土留め壁により構成される。また、腹起し１４は、土留め壁１２の掘削対象領域Ｒ側の面に固定され、前後方向に延在している。本実施の形態の腹起し１４は、Ｈ鋼により構成されるが、他の断面の鋼材等で構成することもできる。 The earth retaining wall 12 of the present embodiment is configured by a known earth retaining wall such as a parent pile lateral sheet pile wall, a steel sheet pile wall, a columnar column type continuous wall, or the like. Further, the erection 14 is fixed to the surface of the earth retaining wall 12 on the side of the excavation target region R and extends in the front-rear direction. The belly ridge 14 of the present embodiment is made of H steel, but can also be made of steel with other cross sections.
トラス切梁１６は、上段切梁２０と、下段切梁２２と、鉛直材２４と、斜材２６とからなり、切梁全体がトラス構造のものである。したがって、上段切梁２０および下段切梁２２がトラス構造の弦材として機能する。本実施の形態の上段切梁２０、下段切梁２２、鉛直材２４はＨ鋼、斜材２６は溝形鋼により構成されるが、他の断面の鋼材等で構成することもできる。 The truss beam 16 is composed of an upper beam 20, a lower beam 22, a vertical member 24, and a diagonal member 26, and the entire beam has a truss structure. Therefore, the upper stage cutting beam 20 and the lower stage cutting beam 22 function as chord members of the truss structure. Although the upper cut beam 20, the lower cut beam 22, and the vertical member 24 of the present embodiment are made of H steel and the diagonal member 26 is made of grooved steel, it can also be made of steel of other cross sections.
上段切梁２０および下段切梁２２は、それぞれ左右方向に延在する切梁である。上段切梁２０は上下方向に間隔をあけた上段側に位置しており、下段切梁２２は下段側に位置している。鉛直材２４は、上段切梁２０と下段切梁２２とを上下方向に連結する部材であり、下部は根入れをしない。斜材２６は、上段切梁２０と鉛直材２４の連結部と、下段切梁２２と鉛直材２４の連結部との間を斜めに連結する部材である。 The upper-stage beam 20 and the lower-stage beam 20 are each a beam that extends in the left-right direction. The upper stage beam 20 is located on the upper stage side spaced apart in the vertical direction, and the lower stage beam 22 is located on the lower stage side. The vertical member 24 is a member that connects the upper-stage cutting beam 20 and the lower-stage cutting beam 22 in the vertical direction, and the lower part is not rooted. The diagonal member 26 is a member that obliquely connects the connecting portion between the upper-stage beam 20 and the vertical member 24 and the connecting portion between the lower-stage beam 22 and the vertical member 24.
フラットジャッキ１８は、上段切梁２０および下段切梁２２にプレロードを導入するための超薄型のジャッキ装置であり、上段切梁２０および下段切梁２２の端部における腹起し１４と土留め壁１２との間に設けられている。 The flat jack 18 is an ultra-thin jack device for introducing a preload to the upper stage cutting beam 20 and the lower stage cutting beam 22. It is provided between the wall 12.
このフラットジャッキ１８は、周知のフラットジャッキにより構成され、周囲に半円形の凹みを有する２枚の薄い軟鋼板を溶接により接合して形成された薄型円盤状の袋体と、袋体を挟んで左右に配置される鋼製メッシュにより補強されたモルタルからなる支圧板とを備えている。一方の支圧板は、腹起し１４の側面に当接配置され、他方の支圧板は土留め壁１２の側面に当接配置される。フラットジャッキ１８の袋体には水またはセメント系注入材を外部から注入、排出するための注入口、排出口がそれぞれ設けられている。注入材を袋体に注入すると袋体が膨張して、袋体の腹起し１４側の側面が一方の支圧板に密着するととともに、袋体の土留め壁１２側の側面が他方の支圧板に密着する。注入材が袋体内の隅々まで行き渡ると、フラットジャッキ１８の左右方向の寸法が増大して腹起し１４側の支圧板と土留め壁１２側の支圧板との間の寸法を大きくする。このようなフラットジャッキ１８の動作によって、上段切梁２０および下段切梁２２にプレロードを導入することができる。 This flat jack 18 is constituted by a known flat jack, and is formed by sandwiching two thin mild steel plates having a semicircular recess around the thin disc-shaped bag body, and sandwiching the bag body. And a bearing plate made of mortar reinforced by steel meshes arranged on the left and right. One of the support plates is disposed in contact with the side surface of the flank 14 and the other support plate is disposed in contact with the side surface of the retaining wall 12. The bag body of the flat jack 18 is provided with an inlet and an outlet for injecting and discharging water or cement-based injecting material from the outside. When the injection material is injected into the bag body, the bag body expands, and the side surface on the side of the retaining wall 12 of the bag body is the other pressure plate while the side surface on the side of the bag body 14 is in close contact with the one pressure plate. Close contact with. When the injection material reaches every corner of the bag body, the dimension of the flat jack 18 in the left-right direction increases to increase the dimension between the bearing plate on the 14 side and the bearing plate on the retaining wall 12 side. By such an operation of the flat jack 18, a preload can be introduced into the upper stage beam 20 and the lower stage beam 22.
したがって、本実施の形態によれば、トラス切梁１６の設置時に、ゆるみの除去および先行プレロードを導入できるため、掘削時の変位を抑制することができる。これにより、掘削時の変位抑制のために必要な切梁構成部材の合理化およびスリム化が図れる。このため、上記の従来の技術に比べて土留め構造の施工コストを縮減することができる。また、施工期間の短縮化および作業安全性の向上を図ることができる。 Therefore, according to this embodiment, when the truss beam 16 is installed, it is possible to remove the looseness and introduce the pre-load, so that the displacement during excavation can be suppressed. Thereby, rationalization and slimming of a beam structural member required for suppressing displacement during excavation can be achieved. For this reason, the construction cost of the earth retaining structure can be reduced as compared with the conventional technique. In addition, the construction period can be shortened and work safety can be improved.
また、本実施の形態のフラットジャッキ１８はトラス切梁１６の左右端部に設置されるため、フラットジャッキ１８の設置箇所はトラス切梁１６の構造的弱部とならない。このように、本実施の形態によれば、上記の従来技術のようにトラス切梁１６の左右方向の中間部分にジャッキを設置せずに済むため、トラス切梁１６の内部に構造的弱部が生じるのを回避することができる。 Further, since the flat jack 18 of the present embodiment is installed at the left and right ends of the truss beam 16, the installation location of the flat jack 18 does not become a structural weak portion of the truss beam 16. As described above, according to the present embodiment, it is not necessary to install a jack in the intermediate portion in the left-right direction of the truss beam 16 as in the above-described prior art. Can be avoided.
なお、上記の実施の形態においては、フラットジャッキ１８を、上段切梁２０および下段切梁２２の端部における腹起し１４と土留め壁１２との間に設けた場合を例にとり説明したが、本発明はこれに限るものではない。例えば、フラットジャッキ１８を、上段切梁２０および下段切梁２２の端部と腹起し１４との間に設けてもよい。このようにしても上記と同様の作用効果を奏することができる。 In the above embodiment, the case where the flat jack 18 is provided between the raised portion 14 and the retaining wall 12 at the ends of the upper and lower beams 20 and 22 has been described as an example. However, the present invention is not limited to this. For example, the flat jack 18 may be provided between the ends of the upper-stage cutting beam 20 and the lower-stage cutting beam 22 and the bulge 14. Even if it does in this way, there can exist an effect similar to the above.
また、上記の実施の形態においては、左右の土留め壁１２および腹起し１４の間にトラス切梁１６が左右方向に架設される場合を例にとり説明したが、本発明のトラス切梁１６はこれに限るものではない。例えば、この構成に加えて、さらに前後の土留め壁１２および腹起し１４を設け、この前後間にトラス切梁１６が前後方向に架設される場合であっても適用可能であり、上記と同様の作用効果を奏することができる。 In the above-described embodiment, the case where the truss beam 16 is installed in the left-right direction between the left and right earth retaining walls 12 and the bulge 14 has been described as an example. Is not limited to this. For example, in addition to this configuration, the front and rear retaining walls 12 and the bulge 14 are further provided, and the present invention is applicable even when the truss beam 16 is installed in the front-rear direction between the front and rear. Similar effects can be obtained.
また、上記の実施の形態においては、トラス切梁１６が上段切梁２０と下段切梁２２という上下２段の弦材で構成される場合を例にとり説明したが、本発明のトラス切梁１６はこれに限るものではなく、上下方向に間隔をあけて３段以上複数段の切梁（弦材）を設置し、各弦材間に斜材、鉛直材を架設することによってトラス切梁１６を構成してもよい。このようにしても、上記と同様の作用効果を奏することができる。 Further, in the above-described embodiment, the case where the truss beam 16 is composed of upper and lower two-stage chords of the upper beam 20 and the lower beam 22 has been described as an example, but the truss beam 16 of the present invention. Is not limited to this, but a truss beam 16 is formed by installing three or more stages of cut beams (string material) at intervals in the vertical direction, and constructing diagonal materials and vertical materials between the string materials. May be configured. Even if it does in this way, there can exist an effect similar to the above.
（土留め構造の施工方法）
次に、本発明に係る土留め構造の施工方法の実施の形態について説明する。この施工方法は、土留め壁１２と腹起し１４の間にフラットジャッキ１８を設置してトラス切梁１６にプレロードを導入し、上記の土留め構造１０を施工するものである。
(Construction method for earth retaining structure)
Next, an embodiment of a construction method for a retaining structure according to the present invention will be described. In this construction method, a flat jack 18 is installed between the earth retaining wall 12 and the uplift 14, and a preload is introduced into the truss beam 16 to construct the earth retaining structure 10 described above.
まず、図２（１）に示すように、上段切梁２０、腹起し１４、フラットジャッキ１８をそれぞれ所定の位置に設置する。続いて、フラットジャッキ１８を作動させて上段切梁２０にプレロードを導入する。 First, as shown in FIG. 2 (1), the upper stage beam 20, the bulge 14, and the flat jack 18 are respectively installed at predetermined positions. Subsequently, the prejack is introduced into the upper stage beam 20 by operating the flat jack 18.
次に、図２（２）に示すように、上段の腹起し１４と土留め壁１２の間に裏込めモルタル２８を打設し、裏込めモルタル２８硬化後に、フラットジャッキ１８を撤去する。これにより、フラットジャッキ１８の使用に伴う施工コストを低減できる。なお、フラットジャッキ１８は撤去せずに残置してもよい。この場合、フラットジャッキ１８は裏込めモルタル２８内に残置されることになるが、フラットジャッキ１８は軟鋼板で形成されているため問題は生じない。 Next, as shown in FIG. 2 (2), a backfill mortar 28 is placed between the upper ridge 14 and the retaining wall 12, and after the backfill mortar 28 is cured, the flat jack 18 is removed. Thereby, the construction cost accompanying use of the flat jack 18 can be reduced. The flat jack 18 may be left without being removed. In this case, the flat jack 18 is left in the backfill mortar 28, but there is no problem because the flat jack 18 is formed of a mild steel plate.
次に、図２（３）に示すように、下段切梁２２を設置可能な深さまで掘削対象領域Ｒを掘削する。 Next, as shown in FIG. 2 (3), the excavation target region R is excavated to a depth at which the lower beam 22 can be installed.
次に、下段の腹起し１４と土留め壁１２の間に裏込めモルタル２８を打設し、裏込めモルタル２８硬化後に、フラットジャッキ１８を撤去する。なお、フラットジャッキ１８は、上段の場合と同様に撤去せずに残置してもよい。 Next, the backfill mortar 28 is placed between the lower bulge 14 and the retaining wall 12, and after the backfill mortar 28 is cured, the flat jack 18 is removed. The flat jack 18 may be left without being removed as in the case of the upper stage.
そして最後に、図２（４）に示すように、鉛直材２４と斜材２６を設置して、切梁全体をトラス切梁化する。このようにすることで、上記の土留め構造１０を施工することができる。 And finally, as shown in FIG. 2 (4), the vertical member 24 and the diagonal member 26 are installed, and the whole beam is made into a truss beam. By doing in this way, said earth retaining structure 10 can be constructed.
このように、本実施の形態の施工方法によれば、トラス切梁１６の設置時に、ゆるみの除去および先行プレロードを導入できるため、掘削時の変位を抑制することができる。これにより、掘削時の変位抑制のために必要な切梁構成部材の合理化およびスリム化が図れる。このため、上記の従来の技術に比べて土留め構造の施工コストを縮減することができる。また、施工期間の短縮化および作業安全性の向上を図ることができる。 As described above, according to the construction method of the present embodiment, when the truss beam 16 is installed, it is possible to remove looseness and introduce a pre-load, so that displacement during excavation can be suppressed. Thereby, rationalization and slimming of a beam structural member required for suppressing displacement during excavation can be achieved. For this reason, the construction cost of the earth retaining structure can be reduced as compared with the conventional technique. In addition, the construction period can be shortened and work safety can be improved.
また、フラットジャッキ１８はトラス切梁１６の左右端部に設置されるため、フラットジャッキ１８の設置箇所はトラス切梁１６の構造的弱部とならない。このように、本実施の形態によれば、上記の従来技術のようにトラス切梁１６の左右方向の中間部分にジャッキを設置せずに済むため、トラス切梁１６の内部に構造的弱部が生じるのを回避することができる。 Further, since the flat jack 18 is installed at the left and right ends of the truss beam 16, the installation location of the flat jack 18 does not become a structural weak portion of the truss beam 16. As described above, according to the present embodiment, it is not necessary to install a jack in the intermediate portion in the left-right direction of the truss beam 16 as in the above-described prior art. Can be avoided.
以上説明したように、本発明に係る土留め構造によれば、掘削対象領域を挟んで左右に設置される土留め壁と、土留め壁に設置される腹起しと、左右の腹起しの間に架設される切梁とを備えた土留め構造であって、前記切梁は、上下方向に間隔をあけて設けられてそれぞれ左右方向に延在する上段切梁および下段切梁と、上段切梁および下段切梁の間に架設され、これらを斜めに連結する斜材とを有するトラス構造の切梁であり、上段切梁および下段切梁の端部における腹起しと土留め壁との間、または、上段切梁および下段切梁の端部と腹起しとの間に、上段切梁および下段切梁にプレロードを導入するための薄型のジャッキ装置が設けられているので、トラス切梁にプレロードを導入可能な土留め構造を提供することができる。 As described above, according to the earth retaining structure according to the present invention, the earth retaining wall installed on the left and right sides of the excavation target area, the stomach raising installed on the earth retaining wall, and the left and right stomach raising An earth retaining structure provided with a cut beam erected between the upper beam and the lower beam that are provided at intervals in the vertical direction and extend in the horizontal direction, respectively. A truss-structured beam constructed between an upper beam and a lower beam, and having diagonal members connecting them diagonally, and an erection and a retaining wall at the ends of the upper beam and the lower beam Or a thin jack device for introducing a preload to the upper stage beam and the lower stage beam between the ends of the upper stage beam and the lower stage beam and the bulge. It is possible to provide a retaining structure capable of introducing a preload to a cut beam.
また、本発明に係る他の土留め構造によれば、前記ジャッキ装置がフラットジャッキであるので、フラットジャッキによってトラス切梁にプレロードを容易に導入することができる。 Further, according to another earth retaining structure according to the present invention, since the jack device is a flat jack, a preload can be easily introduced into the truss beam by the flat jack.
また、本発明に係る土留め構造の施工方法によれば、上述した土留め構造を施工する方法であって、上段切梁の端部における腹起しと土留め壁との間、または、上段切梁の端部と腹起しとの間に、前記ジャッキ装置を設置して、この前記ジャッキ装置により上段切梁にプレロードを導入する工程と、上段切梁にプレロードを導入した後、下段切梁を設置可能な深さまで掘削対象領域を掘削する工程と、下段切梁の端部における腹起しと土留め壁との間、または、下段切梁の端部と腹起しとの間に、前記ジャッキ装置を設置して、この前記ジャッキ装置により下段切梁にプレロードを導入する工程と、上段切梁と下段切梁の間に斜材を設置して切梁全体をトラス構造にする工程とを備えるので、トラス切梁にプレロードを導入可能な土留め構造の施工方法を提供することができる。 Further, according to the construction method of the earth retaining structure according to the present invention, it is a method for constructing the earth retaining structure described above, and between the erection and the earth retaining wall at the end of the upper stage beam, or the upper stage. The step of installing the jack device between the end of the beam and the erection and introducing the preload to the upper beam by the jack device, and introducing the preload to the upper beam, the lower beam Digging the drilling target area to a depth where it can be installed, and between the bulge and the retaining wall at the end of the lower cut beam, or between the end of the lower cut beam and the bulge A step of installing a jack device and introducing a preload to the lower beam by the jack device; and a step of installing a diagonal member between the upper beam and the lower beam to make the entire beam a truss structure. Earth retaining structure that can introduce preload to truss beam It is possible to provide a construction method.
以上のように、本発明に係る土留め構造および施工方法は、開削工事などで用いる土留め構造に有用であり、特に、切梁をトラス構造にしたトラス切梁にプレロードを容易に導入するのに適している。 As described above, the earth retaining structure and the construction method according to the present invention are useful for earth retaining structures used in excavation work and the like, and in particular, a preload is easily introduced into a truss face beam having a truss structure. Suitable for
１０ 土留め構造
１２ 土留め壁
１４ 腹起し
１６ トラス切梁（切梁）
１８ フラットジャッキ（ジャッキ装置）
２０ 上段切梁
２２ 下段切梁
２４ 鉛直材
２６ 斜材
２８ 裏込めモルタル
Ｇ 地山
Ｒ 掘削対象領域
10 Earth retaining structure 12 Earth retaining wall 14 Uprising 16 Truss beam (cut beam)
18 Flat jack (jack device)
20 Upper cut beam 22 Lower cut beam 24 Vertical material 26 Diagonal material 28 Backfill mortar G Ground mountain R Drilling target area
Claims (3)
前記切梁は、上下方向に間隔をあけて設けられてそれぞれ左右方向に延在する上段切梁および下段切梁と、上段切梁および下段切梁の間に架設され、これらを斜めに連結する斜材とを有するトラス構造の切梁であり、
上段切梁および下段切梁の端部における腹起しと土留め壁との間、または、上段切梁および下段切梁の端部と腹起しとの間に、上段切梁および下段切梁にプレロードを導入するための薄型のジャッキ装置が設けられていることを特徴とする土留め構造。 The earth retaining structure includes a retaining wall installed on the left and right sides of the excavation target area, a bellows installed on the retaining wall, and a cut beam constructed between the left and right belly ridges. And
The cut beam is provided between an upper cut beam and a lower cut beam that are provided at intervals in the vertical direction and extend in the left-right direction, and is connected obliquely to the upper cut beam and the lower cut beam. It is a truss structure cutting beam with diagonal materials,
The upper and lower beams are placed between the ridges at the ends of the upper and lower beams and the retaining wall, or between the edges and the ridges of the upper and lower beams. An earth retaining structure, characterized in that a thin jack device for introducing a preload is provided.
上段切梁の端部における腹起しと土留め壁との間、または、上段切梁の端部と腹起しとの間に、前記ジャッキ装置を設置して、この前記ジャッキ装置により上段切梁にプレロードを導入する工程と、
上段切梁にプレロードを導入した後、下段切梁を設置可能な深さまで掘削対象領域を掘削する工程と、
下段切梁の端部における腹起しと土留め壁との間、または、下段切梁の端部と腹起しとの間に、前記ジャッキ装置を設置して、この前記ジャッキ装置により下段切梁にプレロードを導入する工程と、
上段切梁と下段切梁の間に斜材を設置して切梁全体をトラス構造にする工程とを備えることを特徴とする土留め構造の施工方法。 A method for constructing the earth retaining structure according to claim 1 or 2,
The jack device is installed between the erection and the retaining wall at the end of the upper beam or between the end and the erection of the upper beam, and the upper device is installed by the jack device. The process of introducing preload into
After introducing a preload to the upper beam, drilling the excavation target area to a depth where the lower beam can be installed; and
The jack device is installed between the bulge at the end of the lower beam and the retaining wall, or between the end of the lower beam and the erection, and the lower beam is installed by the jack device. The process of introducing preload into
A method for constructing a retaining structure, comprising: providing a diagonal member between an upper beam and a lower beam to make the entire beam a truss structure.
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