JP5880060B2 - Structure and method for suppressing level difference between building and surrounding ground caused by ground subsidence - Google Patents
Structure and method for suppressing level difference between building and surrounding ground caused by ground subsidence Download PDFInfo
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本発明は、地盤沈下により発生する建物と周囲の地盤との段差を抑制する構造及び方法に関する。 The present invention relates to a structure and a method for suppressing a step between a building and a surrounding ground caused by ground subsidence.
軟弱地盤に建てられた構造物が、支持層に達する基礎杭で支持されている場合において、液状化により建物の周囲の地盤が沈下すると、建物は沈下し難いのに対してその周囲の地盤は沈下し易いことから、両者の沈下量に差が生じ、建物とその周囲の地盤とに段差が生じる。これにより、建物の出入口での往来が困難になる等、通行障害が発生する。そのため、建物とその周囲の地盤との沈下量の差を抑制するための基礎構造が提案されている（例えば、特許文献１参照）。 When a structure built on soft ground is supported by foundation piles that reach the support layer, if the ground surrounding the building sinks due to liquefaction, the building is unlikely to sink, but the surrounding ground is Since it is easy to sink, there is a difference in the amount of sinking between the two, and there is a step between the building and the surrounding ground. As a result, traffic obstacles occur, such as difficulty in traffic at the entrances and exits of buildings. For this reason, a basic structure for suppressing the difference in the amount of settlement between the building and the surrounding ground has been proposed (see, for example, Patent Document 1).
特許文献１に記載の基礎構造は、建物の周囲の地盤に、複数の柱状地盤改良体を構築してそれらの頭部を地盤改良体により接続し、建物からの距離が長くなる程、柱状地盤改良体が短くなるようにしたものである。当該基礎構造は、建物側から距離が長くなる程、地盤の沈下量が大きくなるようにすることで、建物と周囲の地盤との段差の発生を抑制しようとするものである。 The basic structure described in Patent Document 1 is that a plurality of columnar ground improvement bodies are constructed on the ground around the building and their heads are connected by the ground improvement body. The longer the distance from the building, the longer the columnar ground. The improved body is made shorter. The foundation structure is intended to suppress the occurrence of a step between the building and the surrounding ground by increasing the amount of ground subsidence as the distance from the building increases.
特許文献１に記載の基礎構造では、地盤の深部まで柱状の地盤改良体を構築するという大掛かりな施工が必要であるため、施工コストが増大であり、工期が長くなる。 The foundation structure described in Patent Document 1 requires a large-scale construction in which a columnar ground improvement body is constructed up to the deep part of the ground, so that the construction cost increases and the construction period becomes long.
本発明は、上記事情に鑑みてなされたものであり、簡易な施工によって、地盤沈下により発生する建物と周囲の地盤との段差を効果的に抑制することを課題とするものである。 This invention is made | formed in view of the said situation, and makes it a subject to suppress effectively the level | step difference of the building and surrounding ground which generate | occur | produce by ground subsidence by simple construction.
上記課題を解決するために、本発明に係る段差抑制構造は、地盤沈下により発生する建物と周囲の地盤との段差を抑制する段差抑制構造であって、建物の周囲の地盤内に側方へ延びるように敷設され、端部が建物の地下部分に接続され、沈下する地盤から受ける面内方向の引張力に耐える引張強度と、地盤の変形に追従する柔軟性とを有する面状の補強材と、建物の周囲の地盤内に側方へ延びるように構築され、地下水を透過し、砂を止める透水砂止層と、を備える。 In order to solve the above-described problem, the step suppressing structure according to the present invention is a step suppressing structure that suppresses a step between a building and a surrounding ground caused by ground subsidence, and laterally into the ground around the building . A planar reinforcing material that is laid to extend , has an end connected to the underground part of the building, and has a tensile strength that can withstand the tensile force in the in-plane direction received from the sinking ground, and a flexibility to follow the deformation of the ground And a permeable sand barrier layer that is constructed so as to extend laterally in the ground around the building, and that permeates groundwater and stops sand.
また、本発明は、地盤沈下により発生する建物と周囲の地盤との段差を抑制する段差抑制構造であって、建物の周囲の地盤内に敷設され、端部が建物の地下部分に接続され、沈下する地盤から受ける面内方向の引張力に耐える引張強度と、地盤の変形に追従する柔軟性とを有する面状の補強材と、建物の周囲の地盤内に構築され、地下水を透過し、砂を止める透水砂止層と、を備え、前記補強材は、前記透水砂止層内に埋設され、透水性を有する。 In addition, the present invention is a step suppressing structure that suppresses a step between a building and surrounding ground generated by ground subsidence, and is laid in the ground around the building, and an end portion is connected to a basement portion of the building, Built in the ground around the building, which has a tensile strength that can withstand the tensile force in the in-plane direction received from the sinking ground, and flexibility to follow the deformation of the ground, it penetrates the groundwater, and a water-permeable sand sealing layer stopping sand, the reinforcing member is embedded in the water-permeable sand sealing layer, to have a water permeability.
また、前記段差抑制構造は、前記透水砂止層内に構築され、前記補強材の一部が埋設されたコンクリートブロックを備えてもよい。 Moreover, the said level | step difference suppression structure may be provided in the said water-permeable sand stop layer, and may be provided with the concrete block by which a part of said reinforcement was embed | buried.
また、前記段差抑制構造は、前記透水砂止層から排水する排水部を備えてもよい。 Moreover, the said level | step difference suppression structure may be equipped with the waste_water | drain part which drains from the said water-permeable sand stop layer.
また、本発明は、地盤沈下により発生する建物と周囲の地盤との段差を抑制する段差抑制構造であって、建物の周囲の地盤内に敷設され、端部が建物の地下部分に接続され、沈下する地盤から受ける面内方向の引張力に耐える引張強度と、地盤の変形に追従する柔軟性とを有する面状の補強材と、建物の周囲の地盤内に構築され、地下水を透過し、砂を止める透水砂止層と、を備え、前記透水砂止層は、粒状材料を敷き詰めることにより構築されている。 In addition, the present invention is a step suppressing structure that suppresses a step between a building and surrounding ground generated by ground subsidence, and is laid in the ground around the building, and an end portion is connected to a basement portion of the building, Built in the ground around the building, which has a tensile strength that can withstand the tensile force in the in-plane direction received from the sinking ground, and flexibility to follow the deformation of the ground, it penetrates the groundwater, and a water-permeable sand sealing layer stopping sand, the permeability Sunatomeso is that built by laying the granular material.
また、本発明に係る段差抑制方法は、地盤沈下により発生する建物と周囲の地盤との段差を抑制する段差抑制方法であって、建物の周囲の地盤内に、沈下する地盤から受ける面内方向の引張力に耐える引張強度と、地盤の変形に追従する柔軟性とを有する面状の補強材を側方へ延びるように敷設し、その端部を建物の地下部分に接続し、建物の周囲の地盤内に、地下水を透過し、砂を止める透水砂止層を側方へ延びるように構築する。 In addition, the step suppressing method according to the present invention is a step suppressing method for suppressing a step between a building and surrounding ground caused by ground subsidence, and the in-plane direction received from the sinking ground in the ground around the building. A sheet-like reinforcing material that has a tensile strength that can withstand the tensile force of the ground and a flexibility that can follow the deformation of the ground is laid to extend sideways, and its end is connected to the underground part of the building, in the ground of passes through the ground water, to construct a hydraulic conductivity sand sealing layer for stopping the sand so as to extend laterally.
本発明によれば、簡易な施工によって、地盤沈下により発生する建物と周囲の地盤との段差を効果的に抑制することができる。 According to the present invention, it is possible to effectively suppress the step between the building and the surrounding ground generated by ground subsidence by simple construction.
以下、本発明の一実施形態を、図面を参照しながら説明する。図１は、本発明の一実施形態に係る地盤沈下により発生する建物１と周囲の地盤２との段差を抑制する構造（以下、段差抑制構造という）１０の概略を示す立面図である。この図に示すように、建物１は、基礎スラブ３と支持層まで打設された基礎杭４とからなる基礎に支持されており、この基礎の周囲の地盤２に段差抑制構造１０が構築されている。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an elevational view showing an outline of a structure 10 (hereinafter referred to as a level difference suppressing structure) 10 that suppresses a level difference between a building 1 and a surrounding ground 2 generated by ground subsidence according to an embodiment of the present invention. As shown in this figure, the building 1 is supported by a foundation composed of a foundation slab 3 and a foundation pile 4 driven up to a support layer, and a level difference suppressing structure 10 is constructed on the ground 2 around the foundation. ing.
図２は、段差抑制構造１０の概略を示す立面図であり、図３は、図２の３−３断面図であり、図４は、図２の４−４断面図である。これらの図に示すように、段差抑制構造１０は、基礎スラブ３の周囲に深さ方向に間隔を空けて敷設された複数の面状の補強材１２と、複数の補強材１２のうちの下側の補強材１２が埋設されるように構築された透水砂止層１４と、透水砂止層１４に設置された排水パイプ１６とを備えている。 2 is an elevation view schematically showing the step suppressing structure 10, FIG. 3 is a sectional view taken along the line 3-3 in FIG. 2, and FIG. 4 is a sectional view taken along the line 4-4 in FIG. As shown in these drawings, the step suppressing structure 10 includes a plurality of planar reinforcing members 12 laid around the foundation slab 3 at intervals in the depth direction, and a lower portion of the plurality of reinforcing members 12. The permeable sand stopping layer 14 constructed so that the reinforcing material 12 on the side is buried and the drain pipe 16 installed in the permeable sand stopping layer 14 are provided.
複数の補強材１２は、水を透過する透水性、地盤の変形に追従する柔軟性、及び、沈下する地盤から受ける面内方向の引張荷重に耐え得る引張強度を有する面状の材料からなり、例えば、ジオテキスタイル等の補強盛土工で使用される網状の織物やパンチングメタルや金網や不織布等が挙げられる。 The plurality of reinforcing members 12 are made of a planar material having water permeability that allows water to pass through, flexibility to follow deformation of the ground, and tensile strength that can withstand a tensile load in the in-plane direction received from the sinking ground, For example, a net-like woven fabric, punching metal, a wire mesh, a non-woven fabric, or the like used in reinforcement embankment such as geotextile can be used.
補強材１２の端部は基礎スラブ３に埋設されることで接合されている。また、上側の補強材１２間には、現地盤の土砂が敷き詰められている。また、補強材１２の建物１からの長さは２〜５ｍである。 The ends of the reinforcing members 12 are joined by being embedded in the foundation slab 3. In addition, between the reinforcing members 12 on the upper side, earth and sand of the local board are spread. The length of the reinforcing material 12 from the building 1 is 2 to 5 m.
透水砂止層１４は、砕石、コンクリートガラ、水砕スラグ、汚泥再生粒状土（再生材）、石炭灰等の粒状材料を敷き詰めてなる層であり、透水性と、砂を止める性質とを有し、粒子間には高い摩擦抵抗が生じる。この透水砂止層１４は、補強材１２が埋設された範囲の全域に形成されており、その厚さは、例えば、数枚の補強材１２を埋設できるように設定されている。 The permeable sand stop layer 14 is a layer formed by laying granular materials such as crushed stone, concrete glass, granulated slag, sludge reclaimed granular soil (recycled material), coal ash, etc. In addition, a high frictional resistance is generated between the particles. The water permeable sand stop layer 14 is formed over the entire range where the reinforcing material 12 is embedded, and the thickness thereof is set so that, for example, several reinforcing materials 12 can be embedded.
排水パイプ１６は、塩化ビニル等の樹脂製の有孔管や網状の管等であり、透水砂止層１４に埋設されている。また、排水パイプ１６は、基礎スラブ３に沿って配されて、その一端は下水道等に接続されており、この排水パイプ１６を通じて透水砂止層１４から下水道等に地下水が排出される。 The drain pipe 16 is a perforated pipe made of resin such as vinyl chloride, a net-like pipe or the like, and is embedded in the permeable sand stop layer 14. The drain pipe 16 is disposed along the foundation slab 3 and one end thereof is connected to a sewer or the like, and ground water is discharged from the permeable sand stop layer 14 to the sewer or the like through the drain pipe 16.
図５は、建物１の周囲の地盤２が液状化により沈下した状態を示す立面図である。この図に示すように、建物１の周囲の地盤２が液状化により沈下した場合、建物１は、支持層まで打設されている基礎杭４により支持されて沈下しないため、建物１とその周囲の地盤２とに沈下量の差が生じる。 FIG. 5 is an elevational view showing a state in which the ground 2 around the building 1 is sunk due to liquefaction. As shown in this figure, when the ground 2 around the building 1 is sunk due to liquefaction, the building 1 is supported by the foundation pile 4 laid up to the support layer and does not sink. There is a difference in the amount of settlement between the ground 2 and the ground.
ここで、一端部が基礎スラブ３に接続された複数の補強材１２が、基礎スラブ２の周囲の地盤２に埋設されていることにより、基礎スラブ３とその周囲の地盤２との一体性が高められている。特に、下側の補強材１２は、現地盤の土砂と比して粒子間の摩擦係数が高い砕石等の粒状材料からなる透水砂止層１４に埋設されているため、基礎スラブ３とその周囲の地盤２との一体性がより一層高められている。 Here, since the plurality of reinforcing members 12 having one end connected to the foundation slab 3 are embedded in the ground 2 around the foundation slab 2, the integrity of the foundation slab 3 and the surrounding ground 2 is improved. Has been enhanced. In particular, since the lower reinforcing material 12 is embedded in the permeable sand stop layer 14 made of a granular material such as crushed stone having a high coefficient of friction between particles as compared with the earth and sand of the local board, the foundation slab 3 and its surroundings are embedded. The unity with the ground 2 is further enhanced.
また、一端部が基礎スラブ３に接続された補強材１２が、地盤の変形に追従可能な柔軟性と、沈下する地盤２からの面内方向の引張荷重に耐え得る引張強度とを有するため、補強材１２の根元部が破断したり、伸びたりすることがない。 Moreover, since the reinforcing member 12 having one end connected to the foundation slab 3 has flexibility to follow the deformation of the ground and a tensile strength capable of withstanding a tensile load in the in-plane direction from the sinking ground 2, The base portion of the reinforcing material 12 is not broken or stretched.
従って、建物１の周囲の地盤２が液状化により沈下した際には、建物１と周囲の地盤２との沈下量の差が、建物１側から離れるにつれて徐々に大きくなり、これにより、建物１と周囲の地盤２との段差を抑制する（滑らかにする）ことができ、建物１の出入口での通行障害を防止できる。 Therefore, when the ground 2 around the building 1 sinks due to liquefaction, the difference in the amount of settlement between the building 1 and the surrounding ground 2 gradually increases as the distance from the building 1 side increases. And the surrounding ground 2 can be suppressed (smoothed), and traffic obstruction at the entrance of the building 1 can be prevented.
また、建物１の周囲の地盤２に透水砂止層１４が形成され、該透水砂止層１４に埋設された補強材１２が透水性を有することにより、液状化が発生した地盤２の間隙水圧を低下させることができる。特に、透水砂止層１４に埋設した排水パイプ１６を通じて透水砂止層１４内の地下水を排出するため、間隙水圧を低下させる効果が高い。さらに、透水砂止層１４がその下方の地盤から地下水と共に上昇する砂を止めて墳砂を抑制する。従って、建物１の周囲の地盤２の沈下を抑制できることにより、建物１と周囲の地盤２との沈下量の差を抑制でき、建物１と周囲の地盤２との間に発生する段差をより効果的に抑制することができる。 In addition, a water-permeable sand barrier layer 14 is formed on the ground 2 around the building 1 and the reinforcing material 12 embedded in the water-permeable sand barrier layer 14 has water permeability, so that the pore water pressure of the ground 2 where liquefaction has occurred. Can be reduced. In particular, since the groundwater in the permeable sand stopping layer 14 is discharged through the drain pipe 16 embedded in the permeable sand stopping layer 14, the effect of reducing the pore water pressure is high. Further, the permeable sand barrier layer 14 stops sand rising together with the groundwater from the lower ground to suppress dredged sand. Therefore, by suppressing the settlement of the ground 2 around the building 1, the difference in the amount of settlement between the building 1 and the surrounding ground 2 can be suppressed, and the steps generated between the building 1 and the surrounding ground 2 are more effective. Can be suppressed.
また、本実施形態に係る段差抑制構造１０は、基礎スラブ３の周囲を掘削し、砕石等の粒状材料を敷き詰めることにより透水砂止層１４を形成すると共にその中に面状の補強材１２を埋設し、透水砂止層１４の上に補強材１２の敷設と現地盤の土砂の埋め戻しとを繰返すという簡易な工事で構築することができる。従って、地盤の深部まで柱状の地盤改良体を構築して段差抑制構造とする場合に比して、段差抑制構造１０の施工コストを低減でき、工期を短縮することができる。 Moreover, the level | step-difference suppression structure 10 which concerns on this embodiment excavates the circumference | surroundings of the foundation slab 3, and forms the water-permeable sand-blocking layer 14 by laying down granular materials, such as a crushed stone, and also has the planar reinforcement 12 in it. It can be constructed by a simple construction of burying and repeating the laying of the reinforcing material 12 on the permeable sand stop layer 14 and the backfilling of the earth and sand of the local board. Therefore, the construction cost of the step suppressing structure 10 can be reduced and the construction period can be shortened as compared with the case where the columnar ground improvement body is constructed to the deep part of the ground to form the step suppressing structure.
図６は、他の実施形態に係る段差抑制構造１００の概略を示す立面図である。この図に示すように、段差抑制構造１００では、複数の補強材１１２の基礎スラブ３からの長さが、上側から下側にかけて次第に長くなっている。また、透水砂止層１１４の基礎スラブ３からの長さは、最下段の補強材１１２の基礎スラブ３からの長さと同等であり、透水砂止層１１４には、最下段の補強材１１２の基端から先端までの全体が埋設されている。 FIG. 6 is an elevation view showing an outline of the step suppressing structure 100 according to another embodiment. As shown in this figure, in the level | step difference suppression structure 100, the length from the basic | foundation slab 3 of the some reinforcing material 112 becomes long gradually from the upper side to the lower side. Further, the length of the permeable sand stop layer 114 from the foundation slab 3 is equal to the length from the foundation slab 3 of the lowermost reinforcing member 112, and the permeable sand stopping layer 114 has the lowermost reinforcing member 112. The whole from the proximal end to the distal end is buried.
図７は、他の実施形態に係る段差抑制構造２００の概略を示す立面図である。この図に示すように、段差抑制構造２００では、複数の補強材２１２の基礎スラブ３からの長さが、上側から下側にかけて次第に短くなっている。また、透水砂止層２１４の基礎スラブ３からの長さは、下から２段目の補強材２１２の基礎スラブ３からの長さと同等であり、透水砂止層２１４には、最下段及び下から２段目の補強材２１２の基端から先端までの全体が埋設されている。 FIG. 7 is an elevation view showing an outline of the step suppressing structure 200 according to another embodiment. As shown in this figure, in the level | step difference suppression structure 200, the length from the basic | foundation slab 3 of the some reinforcing material 212 is gradually shortened from the upper side to the lower side. In addition, the length of the permeable sand stop layer 214 from the foundation slab 3 is the same as the length of the second-stage reinforcing material 212 from the foundation slab 3. From the base end to the tip end of the second-stage reinforcing material 212 is embedded.
図８は、他の実施形態に係る段差抑制構造３００の概略を示す立面図であり、図９は、図８の９−９断面図である。これらの図に示すように、段差抑制構造３００では、複数の補強材１２が基礎スラブ３の高さ方向の中央部に配され、その全数が透水砂止層１４に埋設されている。また、その全ての補強材１２の先端の位置にはコンクリートを打設することでコンクリートブロック３１８が構築されており、全ての補強材１２の先端がコンクリートブロック３１８に埋設されている。 FIG. 8 is an elevation view schematically showing a step suppressing structure 300 according to another embodiment, and FIG. 9 is a cross-sectional view taken along line 9-9 of FIG. As shown in these drawings, in the step suppressing structure 300, a plurality of reinforcing members 12 are arranged in the center portion in the height direction of the foundation slab 3, and the total number thereof is embedded in the permeable sand stop layer 14. In addition, concrete blocks 318 are constructed by placing concrete at the positions of the ends of all the reinforcing members 12, and the ends of all the reinforcing members 12 are embedded in the concrete blocks 318.
即ち、本実施形態に係る段差抑制構造３００では、補強材１２を砕石等の粒子間の摩擦係数が高い粒状材料からなる透水砂止層１４に埋設するのみならず、補強材１２の先端をコンクリートブロック３１８に埋設することにより、基礎スラブ３とその周囲の地盤２との一体性をより一層高めている。これにより、建物１と周囲の地盤２との間に発生する段差をより効果的に抑制することができる。 That is, in the level | step difference suppression structure 300 which concerns on this embodiment, not only the reinforcement material 12 is embed | buried in the water-permeable sand stop layer 14 which consists of granular materials with a high coefficient of friction between particles, such as a crushed stone, but the front-end | tip of the reinforcement material 12 is concrete. By embedding in the block 318, the integrity of the foundation slab 3 and the surrounding ground 2 is further enhanced. Thereby, the level | step difference which generate | occur | produces between the building 1 and the surrounding ground 2 can be suppressed more effectively.
図１０は、他の実施形態に係る段差抑制構造４００の概略を示す立面図であり、図１１は、図１０の１１−１１断面図である。これらの図に示すように、段差抑制構造４００では、透水砂止層１４の上に地盤改良体４２０が構築され、全ての補強材１２が埋設されている。また、その全ての補強材１２の先端の位置にはコンクリートを打設することでコンクリートブロック３１８が構築されており、全ての補強材１２の先端がコンクリートブロック３１８に埋設されている。 FIG. 10 is an elevation view schematically showing a step suppressing structure 400 according to another embodiment, and FIG. 11 is a sectional view taken along the line 11-11 in FIG. As shown in these drawings, in the level difference suppressing structure 400, the ground improvement body 420 is constructed on the permeable sand stop layer 14, and all the reinforcing members 12 are embedded. In addition, concrete blocks 318 are constructed by placing concrete at the positions of the ends of all the reinforcing members 12, and the ends of all the reinforcing members 12 are embedded in the concrete blocks 318.
即ち、本実施形態に係る段差抑制構造４００では、補強材１２を地盤改良体４２０及び透水砂止層１４に埋設し、さらに、補強材１２の先端をコンクリートブロック３１８に埋設することにより、基礎スラブ３とその周囲の地盤２との一体性をより一層高めている。これにより、建物１と周囲の地盤２との間に発生する段差をより効果的に抑制することができる。 That is, in the level difference suppressing structure 400 according to the present embodiment, the reinforcing material 12 is embedded in the ground improvement body 420 and the permeable sand stop layer 14, and the tip of the reinforcing material 12 is embedded in the concrete block 318, thereby 3 and the surrounding ground 2 are further enhanced. Thereby, the level | step difference which generate | occur | produces between the building 1 and the surrounding ground 2 can be suppressed more effectively.
図１２は、他の実施形態に係る段差抑制構造５００の概略を示す立面図であり、図１３は、図１２の１３−１３断面図である。これらの図に示すように、段差抑制構造５００では、建物１の周囲の地盤２の上に砕石等の粒状材料を敷き詰めることにより透水砂止層５１４を構築すると共に、透水砂止層５１４の深さに、基礎スラブ３の壁面に沿って複数列のコンクリートブロック５１８を構築する。そして、透水砂止層５１４及びコンクリートブロック５１８の上に盛土層５２２を構築する。 FIG. 12 is an elevation view schematically showing a level difference suppressing structure 500 according to another embodiment, and FIG. 13 is a sectional view taken along line 13-13 of FIG. As shown in these drawings, in the step suppressing structure 500, the permeable sand stop layer 514 is constructed by laying granular material such as crushed stone on the ground 2 around the building 1, and the depth of the permeable sand stop layer 514 is also increased. In addition, a plurality of rows of concrete blocks 518 are constructed along the wall surface of the foundation slab 3. Then, the embankment layer 522 is constructed on the water-permeable sand stop layer 514 and the concrete block 518.
即ち、本実施形態に係る段差抑制構造５００では、補強材１２を砕石等の粒子間の摩擦係数が高い粒状材料からなる透水砂止層５１４に埋設すると共に、補強材１２の中間部をコンクリートブロック５１８に埋設することにより、基礎スラブ３とその周囲の地盤２との一体性をより一層高めている。これにより、建物１と周囲の地盤２との間に発生する段差をより効果的に抑制することができる。なお、透水砂止層５１４に排水パイプを設けて透水砂止層５１４内に地下水が溜まらないようにすることで、間隙水圧を効果的に低下させることができる。 That is, in the level | step difference suppression structure 500 which concerns on this embodiment, while reinforcing material 12 is embed | buried in the water-permeable sand stop layer 514 which consists of granular materials with a high coefficient of friction between particles, such as crushed stone, the intermediate part of the reinforcing material 12 is a concrete block. By embedding in 518, the integrity of the foundation slab 3 and the surrounding ground 2 is further enhanced. Thereby, the level | step difference which generate | occur | produces between the building 1 and the surrounding ground 2 can be suppressed more effectively. The pore water pressure can be effectively reduced by providing a drainage pipe in the permeable sand stop layer 514 so that groundwater does not accumulate in the permeable sand stop layer 514.
図１４は、他の実施形態に係る段差抑制構造６００の概略を示す立面図であり、図１５は、図１４の１５−１５断面図である。これらの図に示すように、段差抑制構造６００では、建物１の周囲の地盤２の上に砕石等の粒状材料を敷き詰めることにより透水砂止層５１４を構築すると共に、透水砂止層５１４の深さに、複数列複数行の直方体形状のコンクリートブロック６１８を構築する。そして、透水砂止層５１４及びコンクリートブロック６１８の上に地盤改良体６２４を構築し、その上に盛土層６２２を構築する。 FIG. 14 is an elevation view schematically showing a level difference suppressing structure 600 according to another embodiment, and FIG. 15 is a sectional view taken along line 15-15 in FIG. As shown in these drawings, in the level difference suppressing structure 600, the permeable sand stop layer 514 is constructed by laying granular material such as crushed stone on the ground 2 around the building 1, and the depth of the permeable sand stop layer 514 is also increased. In addition, a rectangular parallelepiped concrete block 618 having a plurality of columns and a plurality of rows is constructed. And the ground improvement body 624 is constructed | assembled on the water-permeable sand stop layer 514 and the concrete block 618, and the embankment layer 622 is constructed | assembled on it.
即ち、本実施形態に係る段差抑制構造６００では、補強材１２を砕石等の粒子間の摩擦係数が高い粒状材料からなる透水砂止層５１４に埋設すると共に、補強材１２の中間部をコンクリートブロック６１８に埋設し、さらに、透水砂止層５１４及びコンクリートブロック６１８の上に地盤改良体６２４を構築することにより、基礎スラブ３とその周囲の地盤２との一体性をより一層高めている。これにより、建物１と周囲の地盤２との間に発生する段差をより効果的に抑制することができる。 That is, in the level | step difference suppression structure 600 which concerns on this embodiment, while reinforcing material 12 is embed | buried in the water-permeable sand stop layer 514 which consists of granular materials with a high coefficient of friction between particles, such as a crushed stone, the intermediate part of the reinforcing material 12 is a concrete block. The foundation slab 3 and the surrounding ground 2 are further improved in integration by being embedded in 618 and further by constructing a ground improvement body 624 on the permeable sand stop layer 514 and the concrete block 618. Thereby, the level | step difference which generate | occur | produces between the building 1 and the surrounding ground 2 can be suppressed more effectively.
図１６は、他の実施形態に係る段差抑制構造７００の概略を示す立面図であり、図１７は、図１６の１７−１７断面図である。これらの図に示すように、段差抑制構造７００では、建物１の周囲の地盤２の上に砕石等の粒状材料を敷き詰めることにより透水砂止層５１４を構築すると共に、透水砂止層５１４の深さに、基礎スラブ３の壁面に沿って複数列のコンクリートブロック７１８を構築する。そして、透水砂止層５１４及びコンクリートブロック５１８の上に盛土層５２２を構築する。 FIG. 16 is an elevation view schematically showing a level difference suppressing structure 700 according to another embodiment, and FIG. 17 is a cross-sectional view taken along line 17-17 in FIG. As shown in these drawings, in the level difference suppressing structure 700, the permeable sand stop layer 514 is constructed by laying granular material such as crushed stone on the ground 2 around the building 1, and the depth of the permeable sand stop layer 514 is also increased. In addition, a plurality of rows of concrete blocks 718 are constructed along the wall surface of the foundation slab 3. Then, the embankment layer 522 is constructed on the water-permeable sand stop layer 514 and the concrete block 518.
ここで、コンクリートブロック７１８は、上段、下段と交互に高さが変わるように構築されており、上段のコンクリートブロック７１８は、透水砂止層５１４とその上の盛土層５２２とに跨るように構築され、下段のコンクリートブロック７１８は、透水砂止層５１４とその下の地盤とに跨るように構築されている。 Here, the concrete block 718 is constructed so that the height changes alternately between the upper stage and the lower stage, and the upper concrete block 718 is constructed so as to straddle the permeable sand stop layer 514 and the embankment layer 522 thereabove. The lower concrete block 718 is constructed so as to straddle the water-permeable sand stop layer 514 and the ground below it.
即ち、本実施形態に係る段差抑制構造７００では、補強材１２を砕石等の粒子間の摩擦係数が高い粒状材料からなる透水砂止層５１４に埋設すると共に、補強材１２の中間部を上下段のコンクリートブロック７１８に埋設することにより、基礎スラブ３とその周囲の地盤２との一体性をより一層高めている。これにより、建物１と周囲の地盤２との間に発生する段差をより効果的に抑制することができる。 That is, in the level | step difference suppression structure 700 which concerns on this embodiment, while reinforcing material 12 is embed | buried in the water-permeable sand stop layer 514 which consists of granular materials with a high coefficient of friction between particles, such as a crushed stone, the intermediate part of the reinforcing material 12 is upper and lower level. By embedding in the concrete block 718, the integrity of the foundation slab 3 and the surrounding ground 2 is further enhanced. Thereby, the level | step difference which generate | occur | produces between the building 1 and the surrounding ground 2 can be suppressed more effectively.
図１８は、他の実施形態に係る段差抑制構造８００の概略を示す立面図であり、図１９は、図１８の１９−１９断面図である。これらの図に示すように、段差抑制構造８００では、建物１の周囲の地盤２の上に砕石等の粒状材料を敷き詰めることにより透水砂止層５１４を構築すると共に、透水砂止層５１４の深さに、複数列複数行の直方体形状のコンクリートブロック８１８を構築する。そして、透水砂止層５１４及びコンクリートブロック８１８の上に盛土層６２２を構築する。 FIG. 18 is an elevation view schematically showing a level difference suppressing structure 800 according to another embodiment, and FIG. 19 is a cross-sectional view taken along line 19-19 in FIG. As shown in these drawings, in the step suppressing structure 800, the permeable sand stop layer 514 is constructed by laying a granular material such as crushed stone on the ground 2 around the building 1, and the depth of the permeable sand stop layer 514 is set. In addition, a rectangular parallelepiped concrete block 818 having a plurality of columns and a plurality of rows is constructed. Then, the embankment layer 622 is constructed on the water-permeable sand stop layer 514 and the concrete block 818.
ここで、コンクリートブロック８１８は、上段、下段と交互に高さが変わるように構築されており、上段のコンクリートブロック８１８は、透水砂止層５１４とその上の盛土層６２２とに跨るように構築され、下段のコンクリートブロック８１８は、透水砂止層５１４とその下の地盤とに跨るように構築されている。 Here, the concrete block 818 is constructed so that the height changes alternately between the upper stage and the lower stage, and the upper concrete block 818 is constructed so as to straddle the permeable sand stop layer 514 and the embankment layer 622 above it. The lower concrete block 818 is constructed so as to straddle the water-permeable sand stop layer 514 and the ground below it.
即ち、本実施形態に係る段差抑制構造８００では、補強材１２を砕石等の粒子間の摩擦係数が高い粒状材料からなる透水砂止層５１４に埋設すると共に、補強材１２の中間部を上下段のコンクリートブロック８１８に埋設することにより、基礎スラブ３とその周囲の地盤２との一体性をより一層高めている。これにより、建物１と周囲の地盤２との間に発生する段差をより効果的に抑制することができる。 That is, in the level difference suppressing structure 800 according to the present embodiment, the reinforcing material 12 is embedded in the water permeable sand stop layer 514 made of a granular material having a high coefficient of friction between particles such as crushed stone, and the middle portion of the reinforcing material 12 is arranged in the upper and lower stages. By embedding in the concrete block 818, the integrity of the foundation slab 3 and the surrounding ground 2 is further enhanced. Thereby, the level | step difference which generate | occur | produces between the building 1 and the surrounding ground 2 can be suppressed more effectively.
以上、本発明を実施するための形態について説明したが、上記実施形態は本発明の理解を容易にするためのものであり、本発明を限定して解釈するためのものではない。本発明はその趣旨を逸脱することなく変更、改良され得るとともに、本発明にはその等価物も含まれる。例えば、上記実施形態では、粒状材料を敷き詰めることにより、透水砂止層を構築したが、板状又はブロック状の透水性と砂を止める性能とを有する材料を積層したり敷き詰めたりすることにより、透水砂止層を構築してもよい。 As mentioned above, although the form for implementing this invention was demonstrated, the said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. The present invention can be changed and improved without departing from the gist thereof, and equivalents thereof are also included in the present invention. For example, in the above embodiment, the permeable sand stop layer is constructed by spreading the granular material, but by laminating or spreading the material having the plate-like or block-like water permeability and the performance of stopping the sand, A permeable sand stop layer may be constructed.
１ 建物、２ 地盤、３ 基礎スラブ（地下部分）、４ 基礎杭、１０ 段差抑制構造、１２ 補強材、１４ 透水砂止層、１６ 排水パイプ（排水部）、１００ 段差抑制構造、１１２ 補強材、１１４ 透水砂止層、２００ 段差抑制構造、２１２ 補強材、２１４ 透水砂止層、３００ 段差抑制構造、３１８ コンクリートブロック、４００ 段差抑制構造、４２０ 地盤改良体、５００ 段差抑制構造、５１４ 透水砂止層、５１８ コンクリートブロック、５２２ 盛土層、６００ 段差抑制構造、６１８ コンクリートブロック、６２２ 盛土層、６２４ 地盤改良体、７００ 段差抑制構造、７１８ コンクリートブロック、８００ 段差抑制構造、８１８ コンクリートブロック DESCRIPTION OF SYMBOLS 1 Building, 2 Ground, 3 Foundation slab (underground part), 4 Foundation pile, 10 Level | step difference suppression structure, 12 Reinforcement material, 14 Permeability sand stop layer, 16 Drain pipe (drainage part), 100 Level difference suppression structure, 112 Reinforcement material, 114 permeable sand barrier layer, 200 step restraining structure, 212 reinforcing material, 214 permeable sand stopping layer, 300 step restraining structure, 318 concrete block, 400 step restraining structure, 420 ground improvement body, 500 step restraining structure, 514 water permeable sand stopping layer 518 concrete block, 522 embankment layer, 600 step restraint structure, 618 concrete block, 622 embankment layer, 624 ground improvement body, 700 step restraint structure, 718 concrete block, 800 step restraint structure, 818 concrete block
Claims (6)
建物の周囲の地盤内に側方へ延びるように敷設され、端部が建物の地下部分に接続され、沈下する地盤から受ける面内方向の引張力に耐える引張強度と、地盤の変形に追従する柔軟性とを有する面状の補強材と、
建物の周囲の地盤内に側方へ延びるように構築され、地下水を透過し、砂を止める透水砂止層と、
を備える段差抑制構造。 A level-suppressing structure that suppresses the level difference between the building caused by ground subsidence and the surrounding ground,
It is laid so as to extend sideways in the ground around the building, and the end is connected to the underground part of the building. A planar reinforcing material having flexibility;
Constructed to extend laterally in the ground around the building, a permeable sand stop layer that penetrates groundwater and stops sand,
A step suppressing structure comprising:
建物の周囲の地盤内に敷設され、端部が建物の地下部分に接続され、沈下する地盤から受ける面内方向の引張力に耐える引張強度と、地盤の変形に追従する柔軟性とを有する面状の補強材と、
建物の周囲の地盤内に構築され、地下水を透過し、砂を止める透水砂止層と、
を備え、
前記補強材は、前記透水砂止層内に埋設され、透水性を有する段差抑制構造。 A level-suppressing structure that suppresses the level difference between the building caused by ground subsidence and the surrounding ground,
A surface that is laid in the ground around the building, has an end connected to the basement of the building, has a tensile strength that can withstand the tensile force in the in-plane direction received from the sinking ground, and has flexibility to follow the deformation of the ground Shaped reinforcements,
Constructed in the ground around the building, and a permeable sand barrier that penetrates groundwater and stops sand,
With
The reinforcing material, the permeability is embedded in sand stop layer, stepped difference suppression structure that having a water permeability.
建物の周囲の地盤内に敷設され、端部が建物の地下部分に接続され、沈下する地盤から受ける面内方向の引張力に耐える引張強度と、地盤の変形に追従する柔軟性とを有する面状の補強材と、
建物の周囲の地盤内に構築され、地下水を透過し、砂を止める透水砂止層と、
を備え、
前記透水砂止層は、粒状材料を敷き詰めることにより構築されている段差抑制構造。 A level-suppressing structure that suppresses the level difference between the building caused by ground subsidence and the surrounding ground,
A surface that is laid in the ground around the building, has an end connected to the basement of the building, has a tensile strength that can withstand the tensile force in the in-plane direction received from the sinking ground, and has flexibility to follow the deformation of the ground Shaped reinforcements,
Constructed in the ground around the building, and a permeable sand barrier that penetrates groundwater and stops sand,
With
The permeability Sunatomeso is stepped difference suppression structure that is constructed by laying the granular material.
建物の周囲の地盤内に、沈下する地盤から受ける面内方向の引張力に耐える引張強度と、地盤の変形に追従する柔軟性とを有する面状の補強材を側方へ延びるように敷設し、その端部を建物の地下部分に接続し、
建物の周囲の地盤内に、地下水を透過し、砂を止める透水砂止層を側方へ延びるように構築する段差抑制方法。 A step suppressing method for suppressing a step between a building and a surrounding ground generated by ground subsidence,
In the ground around the building, a planar reinforcing material that has a tensile strength that can withstand the tensile force in the in-plane direction received from the sinking ground and the flexibility to follow the deformation of the ground is laid to extend sideways. , Connect its end to the underground part of the building,
In the ground around the building, through the groundwater level difference suppression method for constructing a hydraulic conductivity sand sealing layer for stopping the sand so as to extend laterally.
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| JP2012007341A JP5880060B2 (en) | 2012-01-17 | 2012-01-17 | Structure and method for suppressing level difference between building and surrounding ground caused by ground subsidence |
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| JP6334021B1 (en) * | 2017-02-24 | 2018-05-30 | エターナルプレザーブ株式会社 | Structure to prevent liquefaction deformation on flat roads |
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| JPH086337B2 (en) * | 1989-03-02 | 1996-01-24 | 株式会社フジタ | Foundation construction method and foundation pile |
| JPH086339B2 (en) * | 1990-08-23 | 1996-01-24 | 株式会社奥村組 | Fluidization prevention wall structure of existing structure supporting ground and its construction method |
| JP3582871B2 (en) * | 1994-11-26 | 2004-10-27 | 武男 稲葉 | Road structure at the boundary between the structure and the embankment |
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| JPH11181794A (en) * | 1997-12-22 | 1999-07-06 | Hamamatsu Juuki Koji Kk | Method for improving ground for house and improved ground structure |
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