JP2021031838A - Earth retaining structure and earth retaining construction method - Google Patents
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- 239000004744 fabric Substances 0.000 claims abstract description 111
- 239000000463 material Substances 0.000 claims abstract description 99
- 238000009412 basement excavation Methods 0.000 claims abstract description 62
- 239000003673 groundwater Substances 0.000 claims abstract description 18
- 238000005192 partition Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 25
- 238000003780 insertion Methods 0.000 claims description 8
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- 239000010959 steel Substances 0.000 abstract description 15
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 210000001015 abdomen Anatomy 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
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Abstract
Description
本発明は、地盤の地山側と掘削側とを仕切る山留構造、及び、山留構築方法に関し、特に、地下水位が掘削予定深度より低い場合（すなわち、山留外側の地下水位が内側の床付地盤より低い場合）に好適な、親杭＋横矢板工法をベースとする山留構造、及び、山留構築方法に関する。 The present invention relates to a mountain retaining structure that separates the ground side and the excavation side of the ground and a method for constructing the mountain retaining, and particularly when the groundwater level is lower than the planned excavation depth (that is, the groundwater level outside the mountain retaining is the inner floor). It relates to a mountain retaining structure based on the parent pile + horizontal sheet pile method and a mountain retaining construction method, which is suitable for (when the ground is lower than the attached ground).
地盤を鉛直に掘って地中に構築する地下構造物としては、各種建築物、立坑、地下タンクなどがある。鉛直に掘削する場合には内部の掘削に先立ってＳＭＷ工法やＴＲＤ工法などによりソイルモルタル製の連続壁からなる山留が構築される。 Underground structures constructed by digging the ground vertically include various buildings, shafts, and underground tanks. In the case of vertical excavation, a mountain retaining wall made of soil mortar is constructed by the SMW method or the TRD method prior to the internal excavation.
山留内側の床付地盤に比較して周辺の地下水位が低い場合には、地下水が入ってこないことから、山留として、親杭＋横矢板工法を適用できる。 If the groundwater level in the surrounding area is lower than that of the ground with a floor inside the mountain, groundwater does not enter, so the parent pile + horizontal sheet pile method can be applied as the mountain.
親杭＋横矢板工法は、親杭として、Ｈ形鋼（例えばH-300×300）を１〜２ｍ間隔で建て込み、背面の土が自立できる範囲で内部掘削を行い、隣り合うＨ形鋼のウェブ間に、両端部をＨ形鋼の掘削側フランジの背面に係止させる形で、横矢板を挿入していく。横矢板としては、木製の厚板、角材、シートパイル（鋼矢板）、Ｈ形鋼（例えばH-150×150）などが用いられる。 In the main pile + horizontal sheet pile method, H-shaped steel (for example, H-300 x 300) is built as a main pile at intervals of 1 to 2 m, and internal excavation is performed within the range where the soil on the back can stand on its own. A horizontal sheet pile is inserted between the webs so that both ends are locked to the back surface of the drilling side flange of H-section steel. As the horizontal sheet pile, wooden planks, square timbers, sheet piles (steel sheet piles), H-shaped steel (for example, H-150 × 150) and the like are used.
特許文献１は、親杭＋横矢板工法を開示している。しかし、これは山留外側の地下水位が内側の床付地盤より高い場合の例で、横矢板の背面側に透水性シート、表面側に止水性シートを配置して、伏流水の処理を行っている。 Patent Document 1 discloses a parent pile + horizontal sheet pile method. However, this is an example of the case where the groundwater level on the outside of the mountain is higher than that on the ground with a floor inside, and a permeable sheet is placed on the back side of the horizontal sheet pile and a water blocking sheet is placed on the front side to treat underground water. ing.
しかしながら、従来の親杭＋横矢板工法では、次のような問題点がある。
大量の横矢板が必要となり、使用後は残置するか、撤去して廃棄処分となる。横矢板がＨ形鋼の場合も１〜２ｍに短く切断していることから産廃となる。
However, the conventional parent pile + horizontal sheet pile method has the following problems.
A large amount of horizontal sheet piles are required, and after use, they are either left behind or removed and disposed of. Even if the horizontal sheet pile is H-shaped steel, it is industrial waste because it is cut short to 1 to 2 m.
親杭（Ｈ形鋼）のウェブ部回り（掘削側フランジ背面）を人力掘削して、横矢板を挿入していくので、手間がかかる。
横矢板は３０〜６０ｋｇ（親杭間隔１〜２ｍの場合）であり、人力のみでの設置は難しい。
Since the horizontal sheet pile is inserted by manually excavating around the web part (the back surface of the flange on the excavation side) of the main pile (H-shaped steel), it takes time and effort.
The horizontal sheet pile weighs 30 to 60 kg (when the distance between the main piles is 1 to 2 m), and it is difficult to install it only by human power.
横矢板は上から配置していき、その下を掘削するので、落下する可能性がある。
また、設置済みの横矢板の下を人力掘削し、横矢板を斜めにして、フランジ背面に挿入するため、必要な掘削深さ（露出面）が大きくなることから、これによっても崩壊の可能性がある。
また、通常は、横矢板の落下防止のため、フランジと横矢板との間に楔を打ち込むが、これにより工数の増加を招いている。
Since the horizontal sheet pile is placed from above and excavated below it, it may fall.
In addition, since the horizontal sheet pile is manually excavated under the installed horizontal sheet pile and the horizontal sheet pile is slanted and inserted into the back surface of the flange, the required excavation depth (exposed surface) increases, which may also cause collapse. There is.
In addition, normally, a wedge is driven between the flange and the horizontal sheet pile to prevent the horizontal sheet pile from falling, which causes an increase in man-hours.
特許文献１については、地下水位以下の掘削における親杭＋横矢板工法である。従って、地下水が浸入してくるので、横矢板の背面側に透水性シート、表面側に止水性シートを配置し、浸入水を内部のピットに集めて排水することとしている。
しかし、親杭＋横矢板工法は、前面を掘削して後、横矢板を嵌め込んでいくのであり、地下水のあるところで、このような掘削を行うと、地盤崩壊を起こす恐れがある。
Patent Document 1 is a parent pile + horizontal sheet pile method for excavation below the groundwater level. Therefore, since groundwater infiltrates, a water permeable sheet is placed on the back side of the horizontal sheet pile and a water blocking sheet is placed on the front side, and the infiltrated water is collected in the internal pit and drained.
However, in the main pile + horizontal sheet pile method, after excavating the front surface, the horizontal sheet pile is fitted, and if such excavation is performed in the presence of groundwater, there is a risk of ground collapse.
本発明は、このような実状に鑑み、地下水位が掘削予定深度より低い場合に好適な山留構造及び山留構築方法を提供することを課題とする。 In view of such an actual situation, it is an object of the present invention to provide a mountain retaining structure and a mountain retaining construction method suitable when the groundwater level is lower than the planned excavation depth.
本発明に係る山留構造は、地盤の地山側と掘削側とを仕切るように所定の間隔で配置される複数の親杭と、隣り合う親杭間に面状に張り渡される布材と、前記親杭の掘削側の面に前記布材を固定する布材固定具と、を備えることを特徴とする。 The mountain retaining structure according to the present invention includes a plurality of parent piles arranged at predetermined intervals so as to partition the ground side and the excavation side of the ground, and a cloth material stretched in a plane between adjacent parent piles. It is characterized in that a cloth material fixing tool for fixing the cloth material is provided on the surface of the parent pile on the excavation side.
前記布材は、その張り渡し方向の一部に、他部より厚みを持たせて形成した厚み部を有し、前記布材固定具は、前記親杭に固定され、前記布材の前記厚み部に対し張り渡し方向に係合するものであるとよい。 The cloth material has a thick portion formed in a part in the stretching direction so as to have a thickness higher than that of the other portion, and the cloth material fixing tool is fixed to the parent pile, and the thickness of the cloth material is increased. It is preferable that the portion is engaged with the portion in the stretching direction.
本発明に係る山留構築方法は、地下水位が掘削予定深度より低い場合に、地盤の地山側と掘削側とを仕切る山留の構築方法であって、
地盤の地山側と掘削側とを仕切るように所定の間隔で、複数の親杭を地中に挿入する親杭挿入工程と、
前記親杭の掘削側を掘削する掘削工程と、
掘削の進行に伴って、隣り合う親杭の露出部間に布材を張り渡して、前記親杭の掘削側の面に前記布材を固定する布材固定工程と、
を含むことを特徴とする。
The method for constructing a mountain reservoir according to the present invention is a method for constructing a mountain reservoir that separates the ground side and the excavation side of the ground when the groundwater level is lower than the planned excavation depth.
A parent pile insertion process in which a plurality of parent piles are inserted into the ground at predetermined intervals so as to partition the ground side and the excavation side of the ground.
The excavation process for excavating the excavation side of the parent pile and
As the excavation progresses, the cloth material is stretched between the exposed parts of the adjacent parent piles, and the cloth material is fixed to the excavation side surface of the parent pile.
It is characterized by including.
上記のように、本発明は、地盤の地山側と掘削側とを仕切る山留構造、及び、山留構築方法に関し、特に、地下水位が掘削予定深度より低い場合に好適な、親杭＋横矢板工法をベースに、通常の木製又は鋼製の横矢板に代えて、布材（本明細書ではこれを「布矢板」とも呼ぶ）を用いることを特徴とする。 As described above, the present invention relates to a mountain retaining structure for partitioning the ground side and the excavation side of the ground and a method for constructing the mountain retaining, and is particularly suitable when the groundwater level is lower than the planned excavation depth. Based on the sheet pile method, it is characterized in that a cloth material (also referred to as "cloth sheet pile" in the present specification) is used instead of the usual wooden or steel horizontal sheet pile.
本発明によれば、横矢板として、従来の木製あるいは鋼製のものに比べて格段に軽い布材を用いることから、人力での取付けが容易であり、施工性に優れる。
また、布材は親杭の掘削側の面に取付けることができ、これによっても取付けが容易となる。
また、布材は残置してもよいし、撤去、処分する場合にも極端に量が少なく、処分費は安価となる。
According to the present invention, since the horizontal sheet pile uses a cloth material that is much lighter than the conventional wooden or steel one, it is easy to install manually and is excellent in workability.
Further, the cloth material can be attached to the surface of the main pile on the excavation side, which also facilitates the attachment.
In addition, the cloth material may be left behind, and when it is removed or disposed of, the amount is extremely small and the disposal cost is low.
上記のように、本発明工法は、山留の背面に地下水が無いという条件で、非常に効率的であり、コストも低減できる。 As described above, the method of the present invention is very efficient and the cost can be reduced on the condition that there is no groundwater on the back surface of the mountain.
以下、本発明の実施の形態について、詳細に説明する。
図１は山留を用いた施工例を示す図である。
Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is a diagram showing a construction example using Yamadome.
施工地盤１の下に地下構造物（各種建築物、立坑、地下タンクなど）を構築施工するに際し、これに先立って、地山側（非掘削領域）と掘削側（掘削予定領域）とを仕切るように、山留（土留）２が構築される。 Before constructing an underground structure (various buildings, shafts, underground tanks, etc.) under the construction ground 1, partition the ground side (non-excavation area) and the excavation side (planned excavation area). In addition, Yamadome (Tsuchidome) 2 is constructed.
特に本例の山留２は、施工地盤１の地下水位ＧＷＬが掘削予定深度（床付地盤７）より低いことを前提に、かかる場合に好適な、親杭＋横矢板工法による山留であり、親杭としてＨ形鋼、横矢板として布材（布矢板）を使用する。但し、図１では、Ｈ形鋼からなる親杭３のみを示し、布材４の図示は省略した。 In particular, Yamadome 2 in this example is a Yamadome by the parent pile + horizontal sheet pile method, which is suitable in such a case on the assumption that the groundwater level GWL of the construction ground 1 is lower than the planned excavation depth (ground with floor 7). , H-shaped steel is used as the main pile, and cloth material (cloth sheet pile) is used as the horizontal sheet pile. However, in FIG. 1, only the main pile 3 made of H-shaped steel is shown, and the illustration of the cloth material 4 is omitted.
親杭３は、施工地盤１の地山側（非掘削領域）と掘削側（掘削予定領域）との仮想の仕切線に沿って、所定の間隔（例えば１〜２ｍ間隔）で複数配置され、それぞれが地中に鉛直方向に建て込まれる。建て込み深度は、掘削予定深度（床付地盤７）より深く設定される。 A plurality of main piles 3 are arranged at predetermined intervals (for example, 1 to 2 m intervals) along a virtual partition line between the ground side (non-excavation area) and the excavation side (planned excavation area) of the construction ground 1, respectively. Is built vertically in the ground. The building depth is set deeper than the planned excavation depth (ground with floor 7).
親杭３は、基本的にＨ形鋼からなる（例えばH-300×300）。従って、親杭３は、前後一対のフランジと、両フランジの中央部をつなぐウェブとを有している。 The main pile 3 is basically made of H-shaped steel (for example, H-300 × 300). Therefore, the main pile 3 has a pair of front and rear flanges and a web connecting the central portions of both flanges.
Ｈ形鋼からなる親杭３は、その前後一対のフランジ同士が、山留２の幅方向にて互いに対向するように設置される。従って、山留２の延在方向（親杭３の列設方向）に隣り合う親杭３については、互いのウェブ同士で対向するようになる。 The main pile 3 made of H-shaped steel is installed so that the pair of front and rear flanges of the main pile 3 face each other in the width direction of the ridge 2. Therefore, the main piles 3 adjacent to each other in the extending direction of the mountain retaining 2 (the direction in which the main piles 3 are arranged) face each other on the webs.
親杭３の建て込み後、親杭３の列の内側（親杭３の列により仕切られる掘削側）が掘削される。そして、掘削の進行に伴って、言い換えれば、所定深さ（例えば２０〜３０ｃｍ）ずつ掘削するごとに、隣り合う親杭３の露出部間に、横矢板相当の布材４（図２）を張渡す。ここでの布材４の設置方法については後に詳述する。 After the main pile 3 is built, the inside of the row of the main pile 3 (the excavation side partitioned by the row of the main pile 3) is excavated. Then, as the excavation progresses, in other words, every time the excavation is performed by a predetermined depth (for example, 20 to 30 cm), a cloth material 4 (FIG. 2) equivalent to a horizontal sheet pile is inserted between the exposed portions of the adjacent parent piles 3. Pile. The method of installing the cloth material 4 here will be described in detail later.
そして、掘削と横矢板相当の布材（布矢板）の設置とを繰り返し、また、所定深度ごとに、腹起し５及び切梁６を設置し、これらを繰り返して、掘削予定深度（床付地盤７）まで掘削する（図１の状態）。 Then, excavation and installation of a cloth material (cloth sheet pile) equivalent to a horizontal sheet pile are repeated, and a belly raising 5 and a girder 6 are installed at predetermined depths, and these are repeated to reach the planned excavation depth (with floor). Excavate to the ground 7) (state in FIG. 1).
その後は、床付地盤７上に地下構造物（図示せず）を構築し、その山留との隙間を埋め戻して、施工を終了する。 After that, an underground structure (not shown) is constructed on the floored ground 7, and the gap with the mountain retaining wall is backfilled to complete the construction.
次に隣り合う親杭３、３間に張り渡される布材４について説明する。
図２は図１の矢印II方向から見た山留の正面図、図３は図２の山留の平面図、図４は図２の山留の右側面図である。
Next, the cloth material 4 stretched between the adjacent main piles 3 and 3 will be described.
2 is a front view of Yamadome seen from the direction of arrow II in FIG. 1, FIG. 3 is a plan view of Yamadome in FIG. 2, and FIG. 4 is a right side view of Yamadome in FIG.
１〜２ｍ間隔で隣り合う親杭３、３間に張り渡される布材４は、所定の引張強度を有するもので、例えば、土木シート、帆布、炭素繊維クロスなどからなり、２０〜３０ｃｍ幅の帯状に形成されている。尚、土木シートなどは薄いことから、複数枚を重ね合わせて使用してもよい。
そして、親杭３の掘削側フランジ面に布材４を固定する布材固定具２０が設けられる。
The cloth material 4 stretched between the adjacent parent piles 3 and 3 at intervals of 1 to 2 m has a predetermined tensile strength, and is made of, for example, a civil engineering sheet, canvas, carbon fiber cloth, etc., and has a width of 20 to 30 cm. It is formed in a band shape. Since the civil engineering sheet or the like is thin, a plurality of sheets may be stacked and used.
Then, a cloth material fixing tool 20 for fixing the cloth material 4 is provided on the excavation side flange surface of the main pile 3.
布材固定具２０による布材固定構造については、図５及び図６により説明する。
図５は、布材の第１固定構造例として、布加工形状を示す平面図（Ａ）及び正面図（Ｂ）である。図６は、第１固定構造例での部材図（Ａ）及び取付図（Ｂ）（Ｃ）である。
The cloth material fixing structure by the cloth material fixing tool 20 will be described with reference to FIGS. 5 and 6.
FIG. 5 is a plan view (A) and a front view (B) showing the cloth processed shape as an example of the first fixed structure of the cloth material. FIG. 6 is a member diagram (A) and mounting diagrams (B) (C) in the first fixed structure example.
本例での布材固定構造は、布材４の両端部（親杭３と対応する位置の部位）に他部より厚みを持たせて形成した厚み部１０と、親杭３に固定され布材４の厚み部１０に対し張り渡し方向に係合する布材固定具２０と、を含んで構成される。 The cloth material fixing structure in this example consists of a thick portion 10 formed by making both ends of the cloth material 4 (parts at positions corresponding to the main pile 3) thicker than the other parts, and a cloth fixed to the main pile 3. It is configured to include a cloth material fixing tool 20 that engages with the thick portion 10 of the material 4 in the stretching direction.
布材４の両端の厚み部１０は、次のように形成される。
布材４は、その両端部にて、二重に折り返され（折り返し部１１）、その中に直径１５〜２０ｍｍのロープ状部材１２を抱き込んだ状態で、縫い合わされている（縫い合わせ部１３）。これにより、布材４の両端部（親杭３と対応する位置の部位）に、折り返し部１１とロープ状部材１２とにより他部より厚みを持たせた厚み部１０が形成される。
ロープ状部材１２としては、ロープなど、ある程度の太さのある丸棒状の部材であればよい。
The thick portions 10 at both ends of the cloth material 4 are formed as follows.
The cloth material 4 is doubly folded back at both ends thereof (folded portion 11), and is sewn together with a rope-shaped member 12 having a diameter of 15 to 20 mm embraced therein (sewn portion 13). .. As a result, thick portions 10 are formed at both ends of the cloth material 4 (parts at positions corresponding to the main pile 3) by the folded-back portion 11 and the rope-shaped member 12 to be thicker than the other portions.
The rope-shaped member 12 may be a round bar-shaped member having a certain thickness such as a rope.
布材固定具２０は、親杭３の掘削側フランジ面上で、布材４の厚み部１０近傍の非厚み部にあてがわれる半割管２１と、半割管２１の両端部を親杭３に固定するボルト２２とを含んで構成される。 The cloth material fixture 20 has a half-split pipe 21 applied to a non-thick portion near the thick portion 10 of the cloth material 4 on the flange surface on the excavation side of the main pile 3, and a parent pile at both ends of the half-split pipe 21. It is configured to include a bolt 22 fixed to 3.
半割管２１は、金属製の管を半割にしたもので、布材４の張り渡し方向と直交する方向（上下方向）に延在し、その円筒面が、親杭３の掘削側フランジ面上にある布材４、特に布材４の厚み部１０近傍の非厚み部（厚み部１０より張し渡し方向内側の非厚み部）に押付けられる。円筒面で布材４に接触することで、布材４の損傷を防止できる。 The half-split pipe 21 is a half-split metal pipe, extends in a direction (vertical direction) orthogonal to the stretching direction of the cloth material 4, and its cylindrical surface is a flange on the excavation side of the main pile 3. It is pressed against the cloth material 4 on the surface, particularly the non-thick part near the thick part 10 of the cloth material 4 (the non-thick part inside the stretched portion 10 from the thickness part 10). By contacting the cloth material 4 on the cylindrical surface, damage to the cloth material 4 can be prevented.
半割管２１は布材４の幅より長く、両端部（布材４の上下の縁部より突出する部位）にボルト挿通孔２１ａを有している。
そして、半割管２１の両端部のボルト挿通孔２１ａに対応させて、親杭３の掘削側フランジにねじ孔２３が形成されている。ねじ孔２３は、親杭３の掘削側フランジに、ウェブ位置を避けて、設けられている。
The half-split pipe 21 is longer than the width of the cloth material 4, and has bolt insertion holes 21a at both ends (portions protruding from the upper and lower edges of the cloth material 4).
Then, a screw hole 23 is formed in the excavation side flange of the main pile 3 so as to correspond to the bolt insertion holes 21a at both ends of the half-split pipe 21. The screw hole 23 is provided on the excavation side flange of the main pile 3 so as to avoid the web position.
従って、布材４の幅が例えば２５ｃｍの場合、布材４の１枚分の深さ以上、例えば３０ｃｍ掘削するごとに、親杭３の露出したフランジ面上に布材４の端部を配置し、その布材４（厚み部１０近傍の非厚み部）の上に半割管２１の円筒面をあてがい、ボルト２２を、半割管２１の両端部のボルト挿通孔２１ａに挿通して、フランジのねじ孔２３に螺合する。このような固定方法とすることで、布材４が裂ける原因となる切欠きや貫通孔を布材４に設けることがない。尚、布材４と半割管２１との間に５ｍｍ厚程度のゴム板を介装してもよい。 Therefore, when the width of the cloth material 4 is, for example, 25 cm, the end portion of the cloth material 4 is arranged on the exposed flange surface of the main pile 3 every time the cloth material 4 is excavated at a depth of one sheet or more, for example, 30 cm. Then, the cylindrical surface of the half-split pipe 21 is applied onto the cloth material 4 (the non-thick portion near the thick portion 10), and the bolts 22 are inserted into the bolt insertion holes 21a at both ends of the half-split pipe 21. It is screwed into the screw hole 23 of the flange. By adopting such a fixing method, the cloth material 4 is not provided with a notch or a through hole that causes the cloth material 4 to be torn. A rubber plate having a thickness of about 5 mm may be interposed between the cloth material 4 and the half-split pipe 21.
これにより、布材４は、その両端部にて、布材固定具２０（半割管２１）により厚み部１０が張り渡し方向に係止されることで、親杭３、３間に張り渡される。詳しくは、布材４に土圧が作用して引張力が働いたときに、厚み部１０が布材固定具２０（半割管２１）に食い込み、布材４の固定端となる。これによって、布材４が土圧抵抗部材として機能する。 As a result, the cloth material 4 is stretched between the main piles 3 and 3 by locking the thickness portion 10 in the stretching direction by the cloth material fixing tool 20 (half split pipe 21) at both ends thereof. Is done. Specifically, when earth pressure acts on the cloth material 4 and a tensile force acts, the thick portion 10 bites into the cloth material fixing tool 20 (half-split pipe 21) and becomes a fixed end of the cloth material 4. As a result, the cloth material 4 functions as an earth pressure resistance member.
また、１つの親杭３のフランジ上では、図６に示されるように、右側に隣り合う親杭間の布材４Ａの端部と、左側に隣り合う親杭間の布材４Ｂの端部とを重ね合わせ、共通の布材固定具２０（半割管２１及びボルト２２）で固定する。 Further, on the flange of one parent pile 3, as shown in FIG. 6, the end of the cloth material 4A between the adjacent parent piles on the right side and the end of the cloth material 4B between the adjacent parent piles on the left side. And are overlapped and fixed with a common cloth material fixing tool 20 (half split pipe 21 and bolt 22).
尚、本例では、親杭３のフランジにねじ孔２３を形成したが、ねじ孔２３に代えてボルト挿通孔を形成し、ナットを用いて固定するようにしてもよい。
ねじ孔２３の場合、親杭３の建て込み時に予めボルト２２をねじ込んでおけば、ねじ孔２３の保護を図ることができる。
In this example, the screw hole 23 is formed in the flange of the main pile 3, but a bolt insertion hole may be formed instead of the screw hole 23 and fixed by using a nut.
In the case of the screw hole 23, the screw hole 23 can be protected by screwing the bolt 22 in advance when the main pile 3 is built.
また、上下方向に隣り合う布材４については、布材固定具２０同士の干渉を防止するため、図２に示されているように、布材固定具２０の固定位置を左右方向に互い違いとなるように変えている。これは、布材４、４間の隙間を極力小さくするためである。
この場合、布材４の幅を両端部に比べ中間部にて幅広とすることで、布材４、４間の隙間を小さくするようにしてもよい。
Further, with respect to the cloth materials 4 adjacent to each other in the vertical direction, in order to prevent the cloth material fixing tools 20 from interfering with each other, the fixing positions of the cloth material fixing tools 20 are staggered in the left-right direction as shown in FIG. I am changing it to be. This is to make the gap between the cloth materials 4 and 4 as small as possible.
In this case, the width of the cloth material 4 may be made wider at the intermediate portion than at both ends to reduce the gap between the cloth materials 4 and 4.
他の布材固定構造については、図７及び図８により説明する。
図７は、布材の第２固定構造例として、布加工形状を示す平面図（Ａ）及び正面図（Ｂ）である。図８は、第２固定構造例での部材図（Ａ）及び取付図（Ｂ）（Ｃ）である。
Other cloth material fixing structures will be described with reference to FIGS. 7 and 8.
FIG. 7 is a plan view (A) and a front view (B) showing the cloth processed shape as an example of the second fixed structure of the cloth material. FIG. 8 is a member diagram (A) and mounting diagrams (B) (C) in the second fixed structure example.
本固定構造例では、布材４を親杭３上で分断せず、つながった状態で張り渡している。
このため、布材４の中間部を親杭３のフランジ上で三重になるように折り返し、左右の各折り返し部１１、１１の中にそれぞれロープ状部材１２、１２を抱き込んだ状態で、縫い合わされている（縫い合わせ部１３、１３）。
従って、この場合は、布材４の中間部で縫い合わせ部１３の左右にロープ状部材１２、１２による厚み部１０、１０が形成される。
In this fixed structure example, the cloth material 4 is stretched in a connected state without being divided on the main pile 3.
Therefore, the intermediate portion of the cloth material 4 is folded back on the flange of the main pile 3 so as to be triple-folded, and the rope-shaped members 12 and 12 are sewn in the left and right folded portions 11 and 11, respectively. They are matched (stitched portions 13, 13).
Therefore, in this case, the thickness portions 10 and 10 formed by the rope-shaped members 12 and 12 are formed on the left and right sides of the sewn portion 13 at the intermediate portion of the cloth material 4.
従って、各親杭３のフランジ上で、左右一対のロープ状部材１２、１２による厚み部１０、１０間の中央（非厚み部）を布材固定具２０（半割管２１）により押さえて、その上下両端部をボルト２２で固定することにより、隣り合う親杭３、３間に布材４を張り渡すことができる。 Therefore, on the flange of each main pile 3, the center (non-thick part) between the thick portions 10 and 10 by the pair of left and right rope-shaped members 12, 12 is pressed by the cloth material fixing tool 20 (half-split pipe 21). By fixing the upper and lower ends thereof with bolts 22, the cloth material 4 can be stretched between the adjacent main piles 3 and 3.
上記のように、従来の木製あるいは鋼製の横矢板に代えて、布材（布矢板）を使用することで、次のような効果が得られる。
従来のものに比べて格段に軽いロープ状部材を仕込んだ布材４を用いることから、人力での取付けが容易であり、施工性に優れる。
As described above, the following effects can be obtained by using a cloth material (cloth sheet pile) instead of the conventional wooden or steel horizontal sheet pile.
Since the cloth material 4 containing a rope-like member, which is much lighter than the conventional one, is used, it is easy to install by human power and is excellent in workability.
また、布材４は親杭３の掘削側フランジの外面に取付けることができ、フランジの内側を掘削する必要もなく、取付けが極めて容易となる。
また、布材４は残置してもよいし、撤去、処分する場合にも極端に量が少なく、処分費は安価となる。
Further, the cloth material 4 can be attached to the outer surface of the excavation side flange of the main pile 3, and it is not necessary to excavate the inside of the flange, which makes the attachment extremely easy.
Further, the cloth material 4 may be left behind, or when it is removed or disposed of, the amount is extremely small and the disposal cost is low.
また、上記のような布矢板を用いた山留構築方法は、地下水位が掘削予定深度より低いことを条件として、次の（１）〜（３）の工程により実現できる。
（１）親杭挿入工程； 地盤の地山側と掘削側とを仕切るように所定の間隔で、複数の親杭を地中に挿入する。
（２）掘削工程； 前記親杭の掘削側を（所定深さずつ）掘削する。
（３）布材固定工程； 掘削の進行に伴って（前記所定深さずつ掘削するごとに）、隣り合う親杭の露出部間に布材を張り渡して、前記親杭の掘削側の面に前記布材を固定する。
Further, the mountain retaining construction method using the cloth sheet pile as described above can be realized by the following steps (1) to (3) on condition that the groundwater level is lower than the planned excavation depth.
(1) Parent pile insertion step; A plurality of parent piles are inserted into the ground at predetermined intervals so as to partition the ground side and the excavation side of the ground.
(2) Excavation process: The excavation side of the parent pile is excavated (by a predetermined depth).
(3) Cloth material fixing step; As the excavation progresses (every time the excavation is performed by the predetermined depth), the cloth material is stretched between the exposed parts of the adjacent parent piles, and the surface of the parent pile on the excavation side. The cloth material is fixed to.
上記の山留構築方法は、地下水位が掘削予定深度より低く、山留の背面に地下水が無いという条件で、非常に効率的であり、コストも低減できる。 The above-mentioned method for constructing a mountain reservoir is very efficient and can reduce the cost on the condition that the groundwater level is lower than the planned excavation depth and there is no groundwater on the back surface of the mountain reservoir.
尚、図示の実施形態はあくまで本発明を概略的に例示するものであり、本発明は、説明した実施形態により直接的に示されるものに加え、特許請求の範囲内で当業者によりなされる各種の改良・変更を包含するものであることは言うまでもない。 It should be noted that the illustrated embodiments merely illustrate the present invention, and the present invention is made by a person skilled in the art within the scope of claims in addition to the ones directly shown by the described embodiments. Needless to say, it includes improvements and changes in.
１ 施工地盤
２ 山留
３ 親杭（Ｈ形鋼）
４ 布材（布矢板）
５ 腹起し
６ 切梁
１０ 厚み部
１１ 折り返し部
１２ ロープ状部材
１３ 縫い合わせ部
２０ 布材固定具
２１ 半割管
２１ａ ボルト挿通孔
２２ ボルト
２３ ねじ孔
1 Construction ground 2 Yamadome 3 Main pile (H-shaped steel)
4 Cloth material (cloth sheet pile)
5 Raised 6 Cut beam 10 Thick part 11 Folded part 12 Rope-shaped member 13 Sewn part 20 Cloth material fixture 21 Half-split pipe 21a Bolt insertion hole 22 Bolt 23 Screw hole
Claims (6)
地盤の地山側と掘削側とを仕切るように所定の間隔で配置される複数の親杭と、
隣り合う親杭間に面状に張り渡される布材と、
前記親杭の掘削側の面に前記布材を固定する布材固定具と、
を備えることを特徴とする、山留構造。 It is a mountain retaining structure that separates the ground side and the excavation side of the ground.
A plurality of parent piles arranged at predetermined intervals so as to separate the ground side and the excavation side of the ground,
The cloth material that is stretched in a plane between the adjacent parent piles,
A cloth material fixing tool for fixing the cloth material to the excavation side surface of the parent pile,
Yamadome structure, which is characterized by being equipped with.
前記布材固定具は、前記親杭に固定され、前記布材の前記厚み部に対し張り渡し方向に係合するものであることを特徴とする、請求項１記載の山留構造。 The cloth material has a thick portion formed by making a part of the cloth material thicker than the other portion in the stretching direction.
The mountain retaining structure according to claim 1, wherein the cloth material fixing tool is fixed to the main pile and engages with the thick portion of the cloth material in the stretching direction.
地盤の地山側と掘削側とを仕切るように所定の間隔で、複数の親杭を地中に挿入する親杭挿入工程と、
前記親杭の掘削側を掘削する掘削工程と、
掘削の進行に伴って、隣り合う親杭の露出部間に布材を張り渡して、前記親杭の掘削側の面に前記布材を固定する布材固定工程と、
を含むことを特徴とする、山留構築方法。 It is a method of constructing a mountain reservoir that separates the ground side and the excavation side of the ground when the groundwater level is lower than the planned excavation depth.
A parent pile insertion process in which a plurality of parent piles are inserted into the ground at predetermined intervals so as to partition the ground side and the excavation side of the ground.
The excavation process for excavating the excavation side of the parent pile and
As the excavation progresses, the cloth material is stretched between the exposed parts of the adjacent parent piles, and the cloth material is fixed to the excavation side surface of the parent pile.
Yamadome construction method characterized by including.
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| JPH10204887A (en) * | 1997-01-20 | 1998-08-04 | Fujimi Green Eng Kk | Net body for normal face greening work and normal face greening method |
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