JP2017227100A - Earth-retaining timbering - Google Patents

Earth-retaining timbering Download PDF

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JP2017227100A
JP2017227100A JP2016126114A JP2016126114A JP2017227100A JP 2017227100 A JP2017227100 A JP 2017227100A JP 2016126114 A JP2016126114 A JP 2016126114A JP 2016126114 A JP2016126114 A JP 2016126114A JP 2017227100 A JP2017227100 A JP 2017227100A
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suspension
mountain retaining
support
pair
cut
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勇太 堀場
Yuta Horiba
勇太 堀場
岳夫 塩田
Takeo Shioda
岳夫 塩田
宗秀 諏訪
Munehide Suwa
宗秀 諏訪
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Taisei Corp
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Taisei Corp
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Abstract

PROBLEM TO BE SOLVED: To provide earth-retaining timbering the stability of which can be secured while drilling work is improved in efficiency.SOLUTION: Earth-retaining timbering 1 comprises: a cut beam 20 provided between a pair of opposed earth-retaining walls 10; a cut beam suspension girder 30 provided above the pair of earth-retaining walls 10 and over both the pair of earth-retaining walls 10; and a suspension cradle 40 suspended and supported from the cut beam suspension girder 30 to support the cut beam 20. It is not necessary to support the cut beam 20 with a shelf pile and a wide excavated space is formed right below the cut beam 20. Further, even if a large perpendicular load is placed on the cut suspension girder 30 owing to shakes of an earthquake, the earth-retaining timbering 1 is stable because of the cut beam suspension girder 30 and the ground on the back of the earth-retaining walls 10.SELECTED DRAWING: Figure 2

Description

本発明は、対向する一対の山留壁間に棚杭を設置することなく切梁が架設された山留め支保工に関する。   The present invention relates to a mountain retaining support in which a beam is installed without installing a shelf pile between a pair of opposing mountain retaining walls.

従来より、切梁を用いた山留め支保工が知られている。
例えば、この山留め支保工は、互いに対向する一対の山留壁と、この一対の山留壁同士の間に架設された切梁と、この切梁の途中に配置されてこの切梁を支持する棚杭（中間杭）と、を備える。
この山留め支保工では、切梁の中間位置に棚杭を設置することで、対向する山留壁同士の間隔が長い場合であっても、切梁を架設することができる。しかし、その反面、掘削箇所に複数の棚杭を設けることになるため、切梁の直下では、掘削作業の作業性が低下する、という問題があった。 Conventionally, a mountain retaining support using a cut beam is known.
For example, the mountain retaining support is a pair of mountain retaining walls facing each other, a cut beam constructed between the pair of mountain retaining walls, and disposed in the middle of the beam to support the cut beam. A shelf pile (intermediate pile).
In this mountain retaining support, by installing a shelf pile at the middle position of the beam, it is possible to install the beam even if the distance between the opposing mountain retaining walls is long. However, on the other hand, since a plurality of shelf piles are provided at the excavation site, there is a problem that the workability of the excavation work is deteriorated immediately below the cutting beam.

そこで、以下のような山留め支保工が提案されている。
特許文献１には、互いに対向する山留壁間に複数段の切梁が架設され、最上段の切梁から下段の切梁を吊り下げ支持する山留め支保工が示されている。
特許文献２には、地下躯体の逆打ち工法において、先行して構築した１階床スラブから切梁を吊り下げ支持する山留め支保工が示されている。 Therefore, the following mountain support works have been proposed.
Japanese Patent Application Laid-Open No. H10-228561 shows a mountain retaining support in which a plurality of stages of beams are installed between mountain walls facing each other and a lower beam is suspended and supported from the uppermost beam.
Patent Document 2 discloses a mountain retaining support that suspends and supports a cut beam from a first-floor slab constructed in advance in the underground driving method of the underground frame.

特開平５−３３１８５６号公報JP-A-5-331856 特開２００３−３４９３９号公報JP 2003-34939 A

ところで、特許文献１、２の山留め支保工では、最上段の切梁や１階床スラブから下段の切梁を吊り下げ支持するため、地震時には、この最上段の切梁や１階床スラブに大きな
鉛直荷重が作用する場合があり、山留め支保工の安定性を確保できないおそれがあった。
また、特許文献２の山留め支保工では、１階床スラブを支持するための構真柱が掘削箇所に設ける必要があるため、依然として、掘削作業に加えて、躯体工事においても施工性が低下する、という問題があった。 By the way, in the mountain retaining support of Patent Documents 1 and 2, the lower beam is suspended from and supported by the uppermost beam and the first floor slab. A large vertical load may act, and there is a possibility that the stability of the support structure for the mountain retaining cannot be secured.
In addition, in the mountain retaining work of Patent Document 2, it is necessary to provide a built-up column for supporting the first floor slab at the excavation site. There was a problem.

本発明は、掘削作業の効率を向上させつつ、支保工の安定性を確保できる、山留め支保工を提供することを目的とする。   An object of the present invention is to provide a mountain support that can secure the stability of the support while improving the efficiency of excavation work.

本発明者らは、対向する一対の山留壁間に架設する山留め支保工として、山留壁の上方に設置した切梁吊桁により下方側に架設される切梁を吊り下げ支持することで、切梁の中間位置に棚杭を設けることなく切梁を支持できる点に着目し、本願発明の山留め支保工の発明に至った。   The present inventors have suspended and supported a cut beam installed on the lower side by a cut beam suspension girder installed above the mountain retaining wall as a mountain retaining support constructed between a pair of opposing mountain retaining walls. Focusing on the fact that the beam can be supported without providing a shelf pile at the middle position of the beam, the inventors have reached the invention of the mountain support structure of the present invention.

第１の発明の山留め支保工（例えば、後述の山留め支保工１、１Ａ、１Ｂ）は、対向する一対の山留壁（例えば、後述の山留壁１０、１０Ａ）の間に設けられた切梁（例えば、後述の切梁２０）を備える山留め支保工であって、前記一対の山留壁の上方でかつ当該一対の山留壁の少なくとも一方に跨がって設けられた切梁吊桁（例えば、後述の切梁吊桁３０、３０Ａ）と、当該切梁吊桁から吊り下げ支持されて前記切梁を支持する吊架台（例えば、後述の吊架台４０、４０Ｂ）と、を備えることを特徴とする。   In the first aspect of the present invention, the retaining support (e.g., later-described retaining support 1, 1A, 1B) is a cut provided between a pair of opposing retaining walls (e.g., later-described retaining walls 10, 10A). A beam retaining girder provided with a beam (for example, a cut beam 20 described later), and is provided above the pair of mountain retaining walls and straddling at least one of the pair of mountain retaining walls. (For example, a below-mentioned beam suspension girder 30, 30A) and a suspension base (for example, a suspension platform 40, 40B described later) supported by being suspended from the beam suspension girder and supporting the beam. It is characterized by.

この発明によれば、吊架台を介して切梁を切梁吊桁から吊り下げ支持したので、切梁を棚杭で支持する必要がなく、切梁の直下に広い掘削空間を確保でき、掘削作業の効率を向上できる。
本願発明の山留め支保工は、対向する一対の山留壁同士を切梁吊桁と切梁によって支持するものであり、切梁単体のみで山留壁を支持する必要がないので、切梁を大断面とする必要はなく、施工性に優れている。
また、切梁を吊り下げ支持する切梁吊桁を、少なくとも一方の山留壁に跨がって設けたので、切梁吊桁の端部が山留壁の背面側の地盤に支持されることになり、地震時の揺れによって切梁吊桁に大きな鉛直荷重がかかっても、切梁吊桁および山留壁の背面の地盤によって山留め支保工の安定性を確保できる。 According to the present invention, since the beam is suspended and supported from the beam suspension beam via the suspension frame, it is not necessary to support the beam with the shelf pile, and a wide excavation space can be secured immediately below the beam, Work efficiency can be improved.
The mountain retaining support of the present invention supports a pair of opposing mountain retaining walls with a beam suspension girder and a beam, and it is not necessary to support the mountain retaining wall with only a single beam. It is not necessary to have a large cross section and is excellent in workability.
Moreover, since the beam suspension girder for hanging and supporting the beam is provided across at least one mountain retaining wall, the end of the beam suspension beam is supported by the ground on the back side of the mountain retaining wall. Therefore, even if a large vertical load is applied to the beam suspension girder due to the shaking at the time of the earthquake, the stability of the mountain support can be secured by the ground behind the beam suspension beam and the mountain retaining wall.

第２の発明の山留め支保工は、前記切梁吊桁は、水平方向に所定間隔おきに複数設けられ、前記吊架台は、隣接する切梁吊桁同士を連結することを特徴とする。   According to a second aspect of the present invention, a plurality of the beam suspension girders are provided at predetermined intervals in the horizontal direction, and the suspension base connects adjacent beam suspension girders.

この発明によれば、切梁吊桁同士を吊架台で連結することで、山留壁に作用する地震荷重に対して複数の切梁吊桁で抵抗でき、山留め支保工の耐震性能を高めることができる。   According to this invention, by connecting the beam suspension girders with a suspension stand, it is possible to resist the seismic load acting on the mountain retaining wall with a plurality of beam suspension girders, and to improve the earthquake resistance performance of the mountain retaining support. Can do.

第３の発明の山留め支保工は、前記吊架台は、前記切梁吊桁の上面に配置されて当該切梁吊桁同士の間に架設されて接合された上側水平材（例えば、後述の上側水平材４１）と、前記切梁の下面または上面に配置されて当該切梁同士の間に架設されて接合された下側水平材（例えば、後述の４２）と、前記上側水平材と前記下側水平材とを連結する吊材（例えば、後述の吊材４３）と、を備えることを特徴とする。   According to a third aspect of the present invention, the suspension support is arranged on the upper surface of the beam suspension girder, and is mounted on the upper horizontal member between the beam suspension beams (for example, the upper horizontal member described later). A horizontal member 41), a lower horizontal member (for example, 42 described later) disposed on the lower surface or the upper surface of the beam and laid between the beams, and the upper horizontal member and the lower beam. And a suspension member (for example, a suspension member 43 described later) for connecting the side horizontal member.

本発明によれば、吊架台は、上側水平材、下側水平材および吊材を含んで構成され、この吊架台によって切梁吊桁と切梁とが連結されて、切梁吊桁から切梁が吊り下げ支持される。したがって、切梁吊桁と切梁とは、容易に長さが変更可能な吊材によって連結されるとともに、切梁吊桁および切梁は、吊材と交差する方向に設置された上側水平材および下側水平材により互いに接合されるので、切梁吊桁と切梁とが一体化した耐震安全性に優れた架設体が形成される。   According to the present invention, the suspension base is configured to include the upper horizontal member, the lower horizontal member, and the suspension member, and the beam suspension girder and the beam are connected by the suspension platform, and the suspension beam is cut from the beam suspension beam. The beam is suspended and supported. Therefore, the cut beam suspension girder and the cut beam are connected by a suspension material whose length can be easily changed, and the cut beam suspension girder and the cut beam are upper horizontal members installed in a direction intersecting with the suspension material. And since it is joined to each other by the lower horizontal member, a construction body excellent in seismic safety in which the beam suspension beam and the beam are integrated is formed.

本発明によれば、対向する一対の山留壁の上方に切梁吊桁を設置し、その切梁吊桁より切梁を吊り下げ支持することで、切梁の中間位置に棚杭を設置する必要がない。よって、掘削作業の効率を向上させつつ、支保工の安定性を確保できる。   According to the present invention, by installing a beam suspension girder above a pair of opposing mountain retaining walls and hanging and supporting the beam from the beam suspension girder, a shelf pile is installed at an intermediate position of the beam There is no need to do. Therefore, it is possible to secure the stability of the support work while improving the efficiency of the excavation work.

本発明の第１実施形態に係る山留め支保工の部分平面図である。It is a partial top view of the mountain retaining support which concerns on 1st Embodiment of this invention. 図１のＡ−Ａ縦断面図である。It is AA longitudinal cross-sectional view of FIG. 図１および図２の破線Ｂで示す部分の斜視図である。It is a perspective view of the part shown with the broken line B of FIG. 1 and FIG. 本発明の第２実施形態に係る山留め支保工の縦断面図である。It is a longitudinal cross-sectional view of the mountain retaining support which concerns on 2nd Embodiment of this invention. 本発明の第３実施形態に係る山留め支保工の縦断面図である。It is a longitudinal cross-sectional view of the mountain retaining support which concerns on 3rd Embodiment of this invention.

本願発明の山留め支保工は、山留壁同士の間に架設される切梁の中間に棚杭を設ける必要はなく、山留壁の上方に切梁吊桁を設置し、その切梁吊桁より切梁を吊り下げ支持させた架設体である。
実施形態は、対向する一対の山留壁の背面側の地盤上に切梁吊桁を設置し、その切梁吊桁より切梁を支持した第１実施形態（図１〜図３）と、一方の山留壁の上方のみに切梁吊桁を設置した第２実施形態（図５）と、切梁吊桁と切梁とを斜材で連結した第３実施形態（図５）と、がある。 The mountain retaining support of the present invention does not require a shelf pile in the middle of the beams built between the retaining walls, and installs a suspended beam girder above the retaining wall, It is a erected body in which a cut beam is suspended and supported.
The embodiment is a first embodiment (FIGS. 1 to 3) in which a beam suspension beam is installed on the ground on the back side of a pair of opposing mountain retaining walls, and the beam is supported by the beam suspension beam, A second embodiment (FIG. 5) in which a beam suspension girder is installed only above one mountain retaining wall, and a third embodiment (FIG. 5) in which the beam suspension beam and the beam are connected with diagonal members; There is.

以下、本発明の実施形態を図面に基づいて説明する。なお、以下の実施形態の説明にあたって、同一構成要件については同一符号を付し、その説明を省略もしくは簡略化する。
〔第１実施形態〕
図１は、本発明の第１実施形態に係る山留め支保工１の部分平面図である。図２は、図１のＡ−Ａ縦断面図である。図３は、図１および図２の破線Ｂで示す部分の斜視図である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description of the embodiments, the same constituent elements are denoted by the same reference numerals, and the description thereof is omitted or simplified.
[First Embodiment]
FIG. 1 is a partial plan view of a mountain retaining structure 1 according to the first embodiment of the present invention. FIG. 2 is a vertical cross-sectional view taken along the line AA in FIG. FIG. 3 is a perspective view of a portion indicated by a broken line B in FIGS. 1 and 2.

山留め支保工１は、地盤面２の所定箇所を床付面３に至るまで掘削するために構築される。この山留め支保工１は、互いに対向する一対の山留壁１０と、一対の山留壁１０同士の間に水平方向に所定間隔おきに架設された切梁２０と、一対の山留壁１０の上方でかつ一対の山留壁１０の両方に跨がって設けられた切梁吊桁３０と、切梁吊桁３０から吊り下げ支持されて切梁２０を支持する吊架台４０と、を備える。   The mountain retaining support 1 is constructed to excavate a predetermined portion of the ground surface 2 up to the floor surface 3. This mountain retaining support 1 includes a pair of mountain retaining walls 10 facing each other, beams 20 laid between the pair of mountain retaining walls 10 at a predetermined interval in the horizontal direction, and a pair of mountain retaining walls 10. A beam suspension girder 30 provided above and across the pair of mountain retaining walls 10, and a suspension base 40 that is supported by being suspended from the beam suspension beam 30 and supports the beam 20. .

山留壁１０は、ＳＭＷ（Soil Mixing Wall）工法、親杭鋼矢板工法、シートパイル工法などにより構築される。この山留壁１０の内壁面には、水平方向に延びる腹起し１１が、腹起しブラケット１２を介して取り付けられている。
切梁２０は、Ｈ形鋼であり、この腹起し１１同士の間に架設されている。また、切梁２０と腹起し１１との間には、切梁２０に対して斜めに延びる火打ち２１が架設されている。 The mountain retaining wall 10 is constructed by an SMW (Soil Mixing Wall) method, a parent pile steel sheet pile method, a sheet pile method, or the like. On the inner wall surface of the mountain retaining wall 10, a flank 11 extending in the horizontal direction is attached via a bulge bracket 12.
The cut beam 20 is an H-shaped steel, and is installed between the raised portions 11. Further, between the cut beam 20 and the bulge 11, a fire striking 21 extending obliquely with respect to the cut beam 20 is installed.

切梁吊桁３０は、Ｈ形鋼であり、これら切梁２０の直上に、水平方向に所定間隔おきに複数設けられている。山留壁１０の背面側の地盤面２上には、Ｈ形鋼である支持部材３１が配置されており、この切梁吊桁３０の両端部は、これら支持部材３１の上に載置されている。これにより、切梁吊桁３０は、両端部で地盤面２に支持されている。また、支持部材３１は、地盤面２にアンカー筋で固定されている。切梁吊桁３０と支持部材３１との間は、地震荷重が作用した際に、上向きの外力に抵抗できるように、ボルト接合されている。   The beam suspension girders 30 are H-shaped steel, and a plurality of beam suspension girders 30 are provided directly above the beam beams 20 at predetermined intervals in the horizontal direction. Support members 31 made of H-shaped steel are disposed on the ground surface 2 on the back side of the mountain retaining wall 10, and both ends of the beam suspension girder 30 are placed on these support members 31. ing. Thereby, the beam suspension beam 30 is supported by the ground surface 2 at both ends. The support member 31 is fixed to the ground surface 2 with anchor bars. The beam suspension girder 30 and the support member 31 are bolted so that they can resist an upward external force when an earthquake load is applied.

吊架台４０は、切梁吊桁３０の上に配置されて切梁吊桁３０同士の間に架設されて接合された上側水平材４１と、切梁２０の下に配置されて切梁２０同士の間に架設されて接合された下側水平材４２と、鉛直方向に延びて上側水平材４１と下側水平材４２とを連結する吊材４３と、隣り合う吊材４３同の間に斜めに設けられたブレース４４と、を備える。   The suspension base 40 is arranged on the beam suspension girder 30 so as to be installed between the beam suspension beams 30 and joined to each other, and the beam suspension 20 is arranged below the beam 20 and between the beam beams 20. A lower horizontal member 42 erected between and connected to each other, a suspension member 43 extending in the vertical direction to connect the upper horizontal member 41 and the lower horizontal member 42, and a slant between adjacent suspension members 43. And a brace 44 provided on the head.

吊材４３は、一対のＨ形鋼であり、この一対のＨ形鋼は、切梁２０の両側に配置されている。
上側水平材４１および下側水平材４２は、互いに背中合わせに配置された一対の溝形鋼であり、この一対の溝形鋼は、吊材４３を両側から挟んで配置されている。このように、吊材４３を両側から挟むように上側水平材４１および下側水平材４２を設けたので、地震荷重によって吊材４３が上側水平材４１や下側水平材４２から脱落するのを防止できる。
ブレース４４は、互いに交差するように配置された一対の山形鋼で構成されている。 The suspension member 43 is a pair of H-section steels, and the pair of H-section steels are disposed on both sides of the cut beam 20.
The upper horizontal member 41 and the lower horizontal member 42 are a pair of channel steels arranged back to back, and the pair of channel steels are arranged with the suspension member 43 sandwiched from both sides. Thus, since the upper horizontal member 41 and the lower horizontal member 42 are provided so as to sandwich the suspension member 43 from both sides, the suspension member 43 is prevented from dropping from the upper horizontal member 41 and the lower horizontal member 42 due to the earthquake load. Can be prevented.
The brace 44 is composed of a pair of angle steels arranged to cross each other.

上側水平材４１は、各切梁吊桁３０にボルト５０で固定され、これにより、切梁吊桁３０同士を連結している。また、吊材４３は、この上側水平材４１にボルト５１で固定されている。
下側水平材４２は、吊材４３にボルト５２で固定されており、切梁２０は、この下側水平材４２にＵボルト５３で取り付けられている。 The upper horizontal member 41 is fixed to each of the beam suspension girders 30 with bolts 50, thereby connecting the beam suspension girders 30 to each other. The suspension member 43 is fixed to the upper horizontal member 41 with bolts 51.
The lower horizontal member 42 is fixed to the suspension member 43 with a bolt 52, and the cut beam 20 is attached to the lower horizontal member 42 with a U bolt 53.

本実施形態によれば、以下のような効果がある。
（１）吊架台４０を介して切梁２０を切梁吊桁３０から吊り下げ支持したので、切梁２０を棚杭で支持する必要がなく、切梁２０の直下に広い掘削空間を確保でき、掘削作業の効率を向上できる。このように、本願発明の山留め支保工１では、掘削空間内に棚杭を設置しないので、作業効率を低下させることなく、建物の地下躯体を構築できる。
また、山留壁１０同士の間に切梁のみを単独で架設する構造ではないので、切梁２０を大断面とする必要がなく、施工性に優れている。
また、切梁２０を吊り下げ支持する切梁吊桁３０を、一対の山留壁１０の両方に跨がって設けたので、切梁吊桁３０の両端部が山留壁１０の背面側の地盤面２に支持されることになり、地震時の揺れによって切梁吊桁３０に大きな鉛直荷重がかかっても、山留め支保工１の安定性を確保できる。
対向する一対の山留壁は、切梁吊桁３０と切梁２０とが連結された架設体である山留め支保工１によって支持されるため、切梁単体のみを大断面化する必要はなく、施工性や鋼材価格を考慮して、市場品を適宜組み合わせて切梁吊桁３０や切梁２０として用いることができる。 According to this embodiment, there are the following effects.
(1) Since the beam 20 is suspended and supported from the beam suspension beam 30 via the suspension base 40, it is not necessary to support the beam 20 with a shelf pile, and a wide excavation space can be secured directly under the beam 20 , Can improve the efficiency of excavation work. As described above, in the mountain retaining support 1 of the present invention, since the shelf pile is not installed in the excavation space, the underground structure of the building can be constructed without lowering the work efficiency.
Moreover, since it is not the structure which installs only a cut beam between the mountain retaining walls 10 mutually, it is not necessary to make the cut beam 20 a large cross section, and it is excellent in workability.
Further, since the beam suspension girder 30 for hanging and supporting the beam 20 is provided across both of the pair of mountain retaining walls 10, both ends of the beam suspension beam 30 are on the back side of the mountain retaining wall 10. Even if a large vertical load is applied to the beam suspension girder 30 due to the shaking at the time of the earthquake, the stability of the timber support 1 can be secured.
Since the pair of opposing mountain retaining walls are supported by the mountain retaining support 1 that is a construction in which the beam suspension girder 30 and the beam 20 are connected, it is not necessary to enlarge only the single beam. In consideration of workability and steel price, it can be used as the beam suspension beam 30 or the beam 20 by appropriately combining market products.

（２）切梁吊桁３０同士を吊架台４０の上側水平材４１で連結することで、山留壁１０に作用する地震荷重に対して複数の切梁吊桁３０で抵抗でき、山留め支保工１の耐震性能を高めることができる。   (2) By connecting the beam suspension girders 30 with the upper horizontal member 41 of the suspension base 40, it is possible to resist the seismic load acting on the mountain retaining wall 10 with a plurality of beam suspension girders 30, and to fix the pile 1's seismic performance can be enhanced.

（３）吊架台４０は、上側水平材４１、下側水平材４２および吊材４３を含んで構成されるので、吊材４３の長さを適宜調整することで、切梁吊桁３０と切梁２０を接合することができる。また、吊架台４０を少ない部材点数でかつ簡素な構造としたので、低コストかつ確実に、切梁吊桁３０から切梁２０を吊り下げ支持できる。   (3) Since the suspension base 40 includes the upper horizontal member 41, the lower horizontal member 42, and the suspension member 43, the length of the suspension member 43 can be adjusted as appropriate, so The beam 20 can be joined. In addition, since the suspension base 40 has a simple structure with a small number of members, it is possible to suspend and support the cut beam 20 from the cut beam suspension girder 30 at a low cost.

〔第２実施形態〕
図４は、本発明の第２実施形態に係る山留め支保工１Ａの縦断面図である。
本実施形態では、切梁吊桁３０Ａが一対の山留壁１０の一方のみに跨がって設けられる点が、第１実施形態と異なる。
すなわち、図４中右側の山留壁１０Ａは、山留壁１０よりも上方まで延びており、山留壁１０Ａには、水平方向に延びる腹起し１３が、腹起しブラケット１４を介して取り付けられている。切梁吊桁３０Ａの図４中右側の端部は、この腹起し１３に接合されている。 [Second Embodiment]
FIG. 4 is a vertical cross-sectional view of a mountain retaining support 1A according to a second embodiment of the present invention.
The present embodiment is different from the first embodiment in that the cut beam suspension beam 30A is provided across only one of the pair of mountain retaining walls 10.
That is, the mountain retaining wall 10A on the right side in FIG. 4 extends upward from the mountain retaining wall 10, and a horizontal erection 13 extending horizontally is provided on the mountain retaining wall 10A via the erection bracket 14. It is attached. The right end in FIG. 4 of the cut beam suspension beam 30 </ b> A is joined to the ridge 13.

本実施形態によれば、上述の（１）〜（３）の効果に加えて、以下のような効果がある。
（４）山留壁１０、１０Ａの一方が高い場合でも、切梁吊桁３０Ａを架設して山留め支保工１Ａを構築できる。 According to this embodiment, in addition to the effects (1) to (3) described above, the following effects can be obtained.
(4) Even when one of the mountain retaining walls 10 and 10A is high, it is possible to construct the mountain retaining support 1A by installing the cut beam suspension girders 30A.

〔第３実施形態〕
図５は、本発明の第３実施形態に係る山留め支保工１Ｂの縦断面図である。
本実施形態では、吊架台４０Ｂの構成が第１実施形態と異なる。
すなわち、吊架台４０Ｂは、第１実施形態の吊架台４０の構成に加えて、鉛直方向に対して斜めに延びて切梁吊桁３０と切梁２０とを直接連結する斜材４５を備える。 [Third Embodiment]
FIG. 5 is a longitudinal cross-sectional view of a mountain retaining support 1B according to a third embodiment of the present invention.
In the present embodiment, the configuration of the suspension base 40B is different from that of the first embodiment.
That is, the suspension base 40B includes a diagonal member 45 that extends obliquely with respect to the vertical direction and directly connects the beam suspension beam 30 and the beam 20 in addition to the configuration of the suspension base 40 of the first embodiment.

本実施形態では、地盤面２上に構築された上面がフラット状のコンクリート平板を、支持部材３１Ａとして用いる。この支持部材３１Ａは、地盤面２にアンカー筋で固定されており、これにより、支持部材３１Ａや切梁吊桁３０に作用する上向きの外荷重に抵抗できる。また、支持部材３１Ａをコンクリート平板とすることで、支持部材３１Ａを地盤面２から任意の高さに容易に設定できる。   In the present embodiment, a concrete flat plate having a flat upper surface constructed on the ground surface 2 is used as the support member 31A. The support member 31A is fixed to the ground surface 2 with anchor bars, and can thereby resist an upward external load acting on the support member 31A and the beam suspension beam 30. Moreover, 31 A of support members can be easily set to arbitrary height from the ground surface 2 by making 31 A of support members into a concrete flat plate.

また、斜材４５は、切梁吊桁３０と切梁２０との間に複数設けられる。なお、この斜材としては、切梁吊桁３０および切梁２０を挟んで一対の鋼材同士を背中合わせに配置してもよい。このようにすれば、切梁吊桁３０と切梁２０との間の一体性が高められ、高い耐震安全性を確保できる。   Further, a plurality of diagonal members 45 are provided between the cut beam suspension beam 30 and the cut beam 20. In addition, as this diagonal material, you may arrange | position a pair of steel materials back to back on both sides of the cut beam hanging girder 30 and the cut beam 20. FIG. In this way, the integrity between the beam suspension beam 30 and the beam 20 is enhanced, and high seismic safety can be ensured.

本実施形態によれば、上述の（１）〜（３）の効果に加えて、以下のような効果がある。
（５）斜材４５により切梁吊桁３０と切梁２０と連結したので、地震による揺れに対して、より確実に抵抗でき、耐震性能を向上できる。 According to this embodiment, in addition to the effects (1) to (3) described above, the following effects can be obtained.
(5) Since the cut beam suspension girder 30 and the cut beam 20 are connected by the diagonal member 45, it is possible to more reliably resist the vibration caused by the earthquake and to improve the earthquake resistance.

なお、本発明は前記実施形態に限定されるものではなく、本発明の目的を達成できる範囲での変形、改良等は本発明に含まれるものである。
また、上述の各実施形態では、吊材４３やブレース４４を一対ずつ設けたが、これに限らず、吊材４３やブレース４４の本数は、各部材に作用する外荷重や負担応力に基づいて、適宜設定されてよい。 It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.
Moreover, in each above-mentioned embodiment, although the suspension material 43 and the brace 44 were provided one by one, not only this but the number of the suspension material 43 or the brace 44 is based on the external load and burden stress which act on each member. May be set as appropriate.

１、１Ａ、１Ｂ…山留め支保工 ２…地盤面 ３…床付面
１０、１０Ａ…山留壁 １１…腹起し １２…腹起しブラケット
１３…腹起し １４…腹起しブラケット ２０…切梁
２１…火打ち ３０、３０Ａ…切梁吊桁 ３１、３１Ａ…支持部材
４０、４０Ｂ…吊架台 ４１…上側水平材 ４２…下側水平材
４３…吊材 ４４…ブレース ４５…斜材
５０、５１、５２…ボルト ５３…Ｕボルト DESCRIPTION OF SYMBOLS 1, 1A, 1B ... Yamazure support 2 ... Ground surface 3 ... Surface with floor 10, 10A ... Yamato wall 11 ... Raised 12 ... Raised bracket 13 ... Raised 14 ... Raised bracket 20 ... Cut Beam 21 ... Fire 30, 30 A ... Cut beam suspension girder 31, 31 A ... Support member 40, 40 B ... Suspension stand 41 ... Upper horizontal material 42 ... Lower horizontal material 43 ... Suspension material 44 ... Brace 45 ... Diagonal material 50, 51, 52 ... Bolt 53 ... U Bolt

Claims (3)

対向する一対の山留壁の間に設けられた切梁を備える山留め支保工であって、
前記一対の山留壁の上方でかつ当該一対の山留壁の少なくとも一方に跨がって設けられた切梁吊桁と、
当該切梁吊桁から吊り下げ支持されて前記切梁を支持する吊架台と、を備えることを特徴とする山留め支保工。 It is a mountain retaining support provided with a cutting beam provided between a pair of opposing mountain retaining walls,
A beam suspension girder provided above the pair of mountain retaining walls and straddling at least one of the pair of mountain retaining walls,
And a suspension stand that is supported by hanging from the beam suspension girder and supports the beam. 前記切梁吊桁は、水平方向に所定間隔おきに複数設けられ、
前記吊架台は、隣接する切梁吊桁同士を連結することを特徴とする請求項１に記載の山留め支保工。 A plurality of the beam suspension girders are provided at predetermined intervals in the horizontal direction,
The mountain support structure according to claim 1, wherein the suspension base connects adjacent beam suspension girders. 前記吊架台は、前記切梁吊桁の上面に配置されて当該切梁吊桁同士の間に架設されて接合された上側水平材と、
前記切梁の下面または上面に配置されて当該切梁同士の間に架設されて接合された下側水平材と、
前記上側水平材と前記下側水平材とを連結する吊材と、を備えることを特徴とする請求項１または２に記載の山留め支保工。 The suspension base is disposed on the upper surface of the beam suspension girder and is installed between the beam suspension girders and joined to the upper horizontal member,
A lower horizontal member disposed on the lower surface or the upper surface of the beam and erected between the beams and joined;
The mountain support structure according to claim 1 or 2, further comprising a suspension member that connects the upper horizontal member and the lower horizontal member.
JP2016126114A 2016-06-25 2016-06-25 Earth-retaining timbering Pending JP2017227100A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210130725A (en) * 2019-02-26 2021-11-01 지난 레일 트랜지트 그룹 컴퍼니 리미티드 Reinforcement device and method for local freezing reinforcement in deep pits in gravel strata containing large amounts of water
CN114032919A (en) * 2021-11-30 2022-02-11 天津建工科技有限公司 Assembled suspension supporting device and method for foundation pit supporting

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210130725A (en) * 2019-02-26 2021-11-01 지난 레일 트랜지트 그룹 컴퍼니 리미티드 Reinforcement device and method for local freezing reinforcement in deep pits in gravel strata containing large amounts of water
KR102709067B1 (en) * 2019-02-26 2024-09-25 지난 레일 트랜지트 그룹 컴퍼니 리미티드 Method for constructing deep pit local freezing reinforcement in gravel layer containing a large amount of moisture
CN114032919A (en) * 2021-11-30 2022-02-11 天津建工科技有限公司 Assembled suspension supporting device and method for foundation pit supporting

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