JP5301721B1 - PC artificial ground in the active fault area and buildings on the PC artificial ground - Google Patents
PC artificial ground in the active fault area and buildings on the PC artificial ground Download PDFInfo
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Abstract
【課題】地震動による縦ずれ断層及び横ずれ断層が生成されても建造物には大きな被害を出さないようにすると共に、地盤の液状化による被害を防止するＰＣ人工地盤を提供する。
【解決手段】ＰＣ人工地盤１は、基礎杭によって支持される一辺１００ｍで、面積１ｈａの大きさのものを４分割にしたＰＣマット基礎ブロック１０が緊張材２０で圧着接合されて相互に回転可能であり、水平縦横方向にプレストレスが導入されている。接合部２は、凹凸形状であり、噛み合った状態で接合され、水平方向には一体となって抵抗する。全素線塗装型ＰＣ鋼より線の緊張材２０が接合部２に曲線状に跨って配設され、接合部２において断面中立軸に位置し、緊張材２０を緊張してＰＣ圧着接合されて相互に回転可能であり、断層の生成による地盤の変動を吸収してＰＣマット基礎ブロック１０の内部応力が過大となるのを阻止する。
【選択図】図１Provided is a PC artificial ground that prevents damage caused by liquefaction of the ground while preventing damage to buildings even if a longitudinal fault and a lateral fault are generated due to earthquake motion.
A PC artificial ground 1 has a side of 100 m supported by a foundation pile, and a PC mat foundation block 10 having an area of 1 ha divided into four parts is pressure-bonded and joined to each other by a tension material 20. Prestress is introduced in the horizontal, vertical and horizontal directions. The joint portion 2 has a concavo-convex shape, is joined in a meshed state, and integrally resists in the horizontal direction. Tension material 20 made of all-wire-painted PC steel wire is arranged in a curved shape at joint 2, is located on the cross-section neutral axis at joint 2, and is tension-bonded to PC 20 by tensioning tension material 20. They are mutually rotatable and absorb ground fluctuations due to the generation of faults to prevent the internal stress of the PC mat foundation block 10 from becoming excessive.
[Selection] Figure 1
Description
本発明は、活断層が存在すると考えられる地域に構築する大規模なＰＣ人工地盤に関する。 The present invention relates to a large-scale PC artificial ground constructed in an area where an active fault is considered to exist.
日本には、数多くの活断層が存在することが指摘されているが、国土が狭く、利用価値の高い地域が限定されており、活断層を避けてインフラとなる建造物を構築することは困難である。
一般に、活断層とは、「最近数十万年間に概ね千年から数万年の間隔で繰り返し活動し、その痕跡が地形に現れ、今後も活動を繰り返すと考えられる断層」であり、ここ１００年間における内陸直下型地震のうち、１９２７年北丹後地震（Ｍ７．３），１９３０年北伊豆地震（Ｍ７．３），１９４３年鳥取地震（Ｍ７．２），１９４５年三河地震（Ｍ６．８），１９７４年伊豆半島沖地震（Ｍ６．９），１９９５年兵庫県南部地震（Ｍ７．２）は、活断層を震源断層として発生したものであり、断層線に沿って地表にずれが出現したが、原子力発電所等の重要構造物を除いて活断層にあまり注意が払われていなかった。
しかしながら、２０１１年３月の東日本大地震の後、特に大地震の被害地にあっては建造物の構築を躊躇することが多くなり、復興速度を減速させる要因となっている。
It has been pointed out that there are many active faults in Japan, but the country is small and the areas with high utility value are limited, so it is difficult to avoid the active faults and build a building that serves as an infrastructure. It is.
In general, an active fault is a fault that has been active repeatedly at intervals of approximately 1,000 to tens of thousands of years in recent hundreds of thousands of years, and its traces appear on the terrain and will continue to operate in the future. Among the inland type earthquakes in Japan, 1927 Kita-Tango earthquake (M7.3), 1930 Kita-Izu earthquake (M7.3), 1943 Tottori earthquake (M7.2), 1945 Mikawa earthquake (M6.8), The 1974 Izu Peninsula Offshore Earthquake (M6.9) and the 1995 Hyogoken-Nanbu Earthquake (M7.2) occurred with active faults as epicenter faults. Not much attention was paid to active faults except for important structures such as nuclear power plants.
However, after the Great East Japan Earthquake in March 2011, especially in the areas affected by the great earthquake, hesitating to build buildings has become a factor that slows the reconstruction speed.
そこで、地震の発生によって活断層にずれが生じたとしても構築した建造物が崩壊して使用不可の状態となることがないように人工地盤を構築し、この人工地盤の上に建造物を構築することによって断層の影響や、地震動にともなう地盤の液状化の影響を排除することが考えられている。 Therefore, even if the active fault slips due to the occurrence of an earthquake, an artificial ground is constructed so that the constructed building will not collapse and become unusable, and the building is built on this artificial ground. It is considered to eliminate the effects of faults and the liquefaction of the ground due to earthquake motion.
特許文献１（特開２００８−０３８４２０号公報）には、杭３で支持された人工地盤１上に免震層を介して建造物を構築するものであり、図６に示すように、人工地盤１は、地盤Ｇの上方に突出させた基礎杭３と、これらの基礎杭３の杭頭部に杭の相対変位を拘束する相対変位拘束部材３１及び積層ゴムとダンパーとからなる免振装置５で人工地盤１を免震化することが開示されている。
また、特許文献２（特開２００８−３０３５８４号公報）には、原地盤上に構築される床版と、床版を支持する原地盤中に造成された地盤改良体からなり、この地盤改良体の上部を鋼板により巻き立てて鋼板の上端部を床版内に突出させて定着させ、鋼板を介して地盤改良体と床版を結合し、かつ鋼板により地盤改良体の上部を外側から拘束した人工地盤が開示されている。
In Patent Document 1 (Japanese Patent Application Laid-Open No. 2008-038420), a building is constructed on an artificial ground 1 supported by a pile 3 via a seismic isolation layer. As shown in FIG. 1 is a foundation pile 3 that protrudes above the ground G, a relative displacement restraining member 31 that restrains the relative displacement of the pile to the pile heads of these foundation piles 3, and a vibration isolator 5 that includes a laminated rubber and a damper. It is disclosed that the artificial ground 1 is seismically isolated.
Patent Document 2 (Japanese Patent Application Laid-Open No. 2008-303588) includes a floor slab constructed on the original ground, and a ground improvement body created in the original ground supporting the floor slab. The upper part of the steel plate is wound up with a steel plate, and the upper end of the steel plate protrudes into the floor slab and is fixed, the ground improvement body and the floor slab are coupled via the steel plate, and the upper part of the ground improvement body is restrained from the outside by the steel plate. An artificial ground is disclosed.
断層には上下方向にずれる縦ずれ断層と水平方向にずれる横ずれ断層がある。従来の人工地盤といわれるものは、上部構造部に伝達される地震動による揺れを緩和したり、地盤の沈下に対応することを目的とするものであり、地震動による断層のずれに対しては対処することを想定しておらず、断層が生じた場合にはその人工地盤に大きな不同沈下や水平方向にずれが生じ、人工地盤上の建造物にも大きな被害が生ずるものであった。
また、液状化しやすい地盤では、地震動が長時間継続すると、地盤が液状化して人工地盤の大きな変形を引き起こすことになるので、液状化による被害を最小限にとどめることが望まれていた。
There are two types of faults: vertical faults that shift vertically and horizontal faults that shift horizontally. The conventional artificial ground is intended to alleviate the shaking caused by the earthquake motion transmitted to the superstructure or to cope with the subsidence of the ground. However, when a fault occurred, the artificial ground was largely subsidized or displaced in the horizontal direction, causing significant damage to the building on the artificial ground.
In addition, in the ground that tends to liquefy, if the ground motion continues for a long time, the ground will liquefy and cause a large deformation of the artificial ground, so it was desired to minimize the damage caused by liquefaction.
更に、直下型地震では、地表に近い地盤が軟弱地盤で地下水位が高いと液状化が起こり、地盤沈下の可能性が高いものとなる。また、支持地盤上に厚い堆積層が生成された地域では、横ずれ断層が地表面に表出する場合が多い。
本発明は、地震動によって断層が生じても、建造物には大きな被害を出さないようにすると共に、地盤の液状化による被害を防止する人工地盤を提供するものである。
Furthermore, in a direct earthquake, if the ground near the surface is soft and the groundwater level is high, liquefaction occurs and the possibility of ground subsidence is high. In areas where thick sedimentary layers are formed on the supporting ground, strike-slip faults often appear on the ground surface.
The present invention provides an artificial ground that prevents damage caused by liquefaction of the ground, while preventing damage to buildings even if a fault occurs due to earthquake motion.
支持地盤に達する複数の杭に支持されたＰＣコンクリート造人工地盤であって、該人工地盤は、複数のブロックに分割して回転可能に接合されており、分割されたＰＣマット基礎ブロックは一辺５０ｍの矩形であって水平方向縦横にプレストレスが導入されており、ＰＣマット基礎ブロックの接合部は凹凸に形成されて相互に噛み合わせてあり、接合部に跨って曲線状に配設された緊張材によって緊張定着されて接合されたＰＣマット基礎ブロックが相互に回転可能に圧着接合されたＰＣ人工地盤である。
ＰＣ人工地盤の外周には、少なくとも杭の直径の２倍の長さの拘束壁が地中に向かって設けてあり、人工地盤下の地盤を拘束し、地震動による地下水圧の上昇によって土砂が流動化するのを阻止するものである。
更に、拘束壁にはフィルター及び一方向弁が設置された穴が設けてあり、水圧が上昇した地下水を人工地盤下部より外側に流出させることによってＰＣ人工地盤が水圧によって浮き上がるのを阻止するものである。
A PC concrete artificial ground supported by a plurality of piles reaching the supporting ground, the artificial ground divided into a plurality of blocks and rotatably joined, and the divided PC mat foundation block has a side of 50 m The prestress is introduced horizontally and vertically and horizontally, and the joint part of the PC mat foundation block is formed in irregularities and meshed with each other, and the tension arranged in a curved shape across the joint part This is a PC artificial ground in which PC mat foundation blocks, which are tension-fixed by materials and bonded together, are pressure-bonded to each other so as to be rotatable.
On the outer circumference of the PC artificial ground, there is a constraining wall at least twice as long as the diameter of the pile toward the ground, constraining the ground under the artificial ground, and the earth and sand flow due to the rise of groundwater pressure due to earthquake motion It is a thing that prevents it from becoming.
Furthermore, the constraining wall is provided with a hole in which a filter and a one-way valve are installed to prevent the PC artificial ground from floating due to the water pressure by allowing the groundwater whose water pressure has increased to flow outside the lower part of the artificial ground. is there.
本発明のＰＣ人工地盤は、複数のＰＣマット基礎ブロックに分割されて回転可能に接合され、各ＰＣマット基礎ブロック相互が凹凸に形成されると共に接合部に跨ってブロック断面の中立軸近傍に配設された緊張材を緊張することによって回転可能にＰＣ圧着接合されているため、地震動によって断層が生成されてもＰＣ人工地盤に横ずれが生じることなく一体性が確保されると共に、ＰＣマット基礎ブロック接合部が回転連結機構であり、断層の生成による支持層の縦ずれによる杭体の傾斜の影響を大幅に軽減させることができ、断層による地盤反力の変動で発生した過大な内部応力を小さくすることができる。また、ＰＣ人工地盤全体としての傾斜や破壊といった被害を小さくすることができ、ＰＣ人工地盤上の建造物の破壊を極力小さくすることが可能である。
ＰＣ人工地盤の外周部には、地中方向に向かう支持杭の径の２倍以上の長さの拘束壁を設けることによって、液状化現象を防止し、地表面の横ずれによる杭頭部損傷を防止することができる。
更に、建造物を免震装置を介してＰＣ人工地盤上に構築することによって倒壊などの被害を抑制することが可能であり、ＰＣマット基礎ブロックの接合部に跨って構築される建造物の場合、接合部を跨ぐ部分の構造材をピン接続とすることによって建造物の使用が不可能となるような重大な破壊が生ずるのを減らすことができる。
The PC artificial ground according to the present invention is divided into a plurality of PC mat foundation blocks and joined in a rotatable manner. Each PC mat foundation block is formed with irregularities and arranged near the neutral axis of the block cross section across the joint. The PC mat foundation block is secured while the PC artificial ground is not laterally displaced even if a fault is generated by the seismic motion, because the PC is press-bonded so that it can rotate by tensioning the tension material provided. The joint is a rotary connection mechanism, which can greatly reduce the influence of the slope of the pile body due to the longitudinal displacement of the support layer due to the generation of faults, and reduce the excessive internal stress generated by the fluctuation of ground reaction force due to the faults can do. Further, it is possible to reduce damage such as inclination and destruction of the PC artificial ground as a whole, and it is possible to minimize the destruction of the building on the PC artificial ground.
On the outer circumference of the PC artificial ground, a liquefaction phenomenon is prevented by providing a constraining wall with a length of more than twice the diameter of the support pile that goes in the underground direction. Can be prevented.
Furthermore, it is possible to suppress damage such as collapse by building the building on the PC artificial ground via a seismic isolation device, and in the case of a building built across the joint of the PC mat foundation block By making the structural material of the part straddling the joint part into the pin connection, it is possible to reduce the occurrence of serious destruction that makes it impossible to use the building.
図１及び図２は、本発明のＰＣ人工地盤の平面図と断面図である。ＰＣ人工地盤１は、鋼杭またはＰＣコンクリート杭からなる支持地盤Ｂに達する基礎杭３で支持されるもので、一辺１００ｍで、面積１ｈａの大きさのものを４分割にしたＰＣマット基礎ブロック１０が、接合部に跨って曲線状に配設された緊張材２０で圧着接合されたものである。緊張材２０は、接合面においては、ＰＣマット基礎ブロック１０の断面の中立軸近傍に位置するように配設され、ＰＣマット基礎ブロック１０の接合面における両方向の回転に対応できるようにしてある。
建造物の接合部に跨る部材をピン接合構造に限定することなく種々の建造物が建てられるようにすること、及びＰＣ人工地盤１の内部応力を小さく抑えることの両方を満足する大きさとして、５０ｍ×５０ｍが最も適当な大きさであるから、１ｈａの人工地盤１を４分割にしてＰＣマット基礎ブロックは一辺５０ｍの矩形とすることが好ましい。
各ＰＣマット基礎ブロック１０は、縦横方向にＰＣ鋼材１２によってプレストレスが導入されている。ＰＣマット基礎ブロック１０の接合部２は凹凸形状としてあり、噛み合った状態で接合されており、水平方向には一体となって抵抗するようにしてある。
ＰＣマット基礎ブロック１０は、接合部２に跨って曲線状に配設された緊張材２０を緊張することによってＰＣ圧着接合されて相互に回転可能としてあり、一体化されて広大な面積のＰＣ人工地盤１となっている。
ＰＣマット基礎ブロック１０を接合する緊張材２０は、素線の全周に防錆被膜が形成してある全素線塗装型ＰＣ鋼より線を使用するのが、長期の防錆効果が期待できるので好ましい。
FIG.1 and FIG.2 is the top view and sectional drawing of PC artificial ground of this invention. The PC artificial ground 1 is supported by a foundation pile 3 that reaches a supporting ground B made of a steel pile or a PC concrete pile. A PC mat foundation block 10 having a side of 100 m and an area of 1 ha divided into four parts. However, it is pressure-bonded and joined by the tension material 20 disposed in a curved line across the joint. The tendon member 20 is disposed on the joining surface so as to be positioned near the neutral axis of the cross section of the PC mat foundation block 10 so as to be able to cope with rotation in both directions on the joining surface of the PC mat foundation block 10.
As a size satisfying both of allowing various buildings to be built without limiting the members straddling the joint portion of the building to the pin joint structure and suppressing the internal stress of the PC artificial ground 1 to be small, Since 50 m × 50 m is the most appropriate size, it is preferable to divide the 1-ha artificial ground 1 into four and make the PC mat foundation block a rectangle with a side of 50 m.
Each PC mat foundation block 10 is prestressed by the PC steel material 12 in the vertical and horizontal directions. The joint portion 2 of the PC mat base block 10 has an uneven shape, is joined in a meshed state, and integrally resists in the horizontal direction.
The PC mat foundation block 10 is PC-bonded and joined to each other by tensioning the tension members 20 arranged in a curved line across the joint portion 2, and can be rotated with each other. It is ground 1.
The tension material 20 for joining the PC mat base block 10 is expected to have a long-term rust-preventing effect by using a wire made of all-wire coated PC steel in which a rust-proof coating is formed on the entire circumference of the wire. Therefore, it is preferable.
接合部２は、必要に応じて鋼板等で補強してある。接合部２がＰＣ圧着工法で接合してあるため、断層が生じた場合でも接合部２が相対的に回転することによって損傷が大きくなるのが防止され、修復不可能となる破壊に至らないようにしてあり、復旧を容易にしている。なお、接合部２にはＰＣ圧着工法で使用されている弾性目地材などを適宜使用し、接合部の変形エネルギーを吸収してＰＣマット基礎ブロック本体に大きな破壊が及ばないようにしてある。 The joint 2 is reinforced with a steel plate or the like as necessary. Since the joining portion 2 is joined by the PC crimping method, even when a fault occurs, the joining portion 2 is prevented from being damaged due to relative rotation, so that it cannot be repaired. It is easy to recover. It should be noted that an elastic joint material or the like used in the PC crimping method is appropriately used for the joint portion 2 so as to absorb the deformation energy of the joint portion so that the PC mat foundation block main body is not largely broken.
図２〜４において、Ｓは想定横滑り面を示す。想定横滑り面ＳをＰＣ人工地盤１の下面より杭径の２倍の深さに設定し、ＰＣ人工地盤１の外周部には、地中方向に想定横滑り面より深い位置に先端部が達する拘束壁１１、即ち、基礎杭３の直径の２倍以上の長さの拘束壁１１が形成されており、ＰＣ人工地盤下の土砂が液状化してもＰＣ人工地盤領域から外部に流出しないように人工地盤の領域内に拘束するようにしてある。土砂をＰＣ人工地盤内の領域内に拘束することによって人工地盤１の下部に空洞が生成されるのを防止する。
横ずれによる地層のすべり面を拘束壁の下端に設定することで、ＰＣ人工地盤直下の地盤全体を横すべりさせることになり、杭頭部の直接せん断破壊が避けることができる。
2 to 4, S indicates an assumed skid surface. The assumed skid surface S is set to a depth twice the diameter of the pile from the lower surface of the PC artificial ground 1 and the outer peripheral portion of the PC artificial ground 1 is constrained to reach the tip at a position deeper than the assumed skid surface in the underground direction. A wall 11, that is, a constraining wall 11 having a length more than twice the diameter of the foundation pile 3, is formed so that even if the soil under the PC artificial ground liquefies, it does not flow out of the PC artificial ground region. Restrained within the ground area. By restraining the earth and sand in the area within the PC artificial ground, a cavity is prevented from being generated in the lower part of the artificial ground 1.
By setting the slip surface of the formation due to the lateral slip at the lower end of the restraint wall, the entire ground directly under the PC artificial ground is slid, and the direct shear failure of the pile head can be avoided.
ＰＣマット基礎ブロック１０、または、拘束壁１１の適宜の個所にフィルター及び一方向弁を設けた水抜き穴（図示しない）が形成してあり、地震等によって地下水圧が上昇した際にＰＣマット基礎ブロック１０の底面に作用する揚圧力を逃がし、フィルターによって土砂が人工地盤面に噴出するのを防止している。
ＰＣ人工地盤１を複数のＰＣマット基礎ブロック１０相互をＰＣ圧着工法で回転可能に接合することによって、人工地盤１の下に断層ができたとしても、ＰＣマット基礎ブロック１０が相互に回転し、ＰＣ人工地盤の変形を接合部２で吸収し、ＰＣマット基礎ブロック１０の内部に過大な応力が発生して破壊されるのを防止している。
A water drain hole (not shown) provided with a filter and a one-way valve is formed at an appropriate location on the PC mat foundation block 10 or the constraining wall 11, and when the ground water pressure rises due to an earthquake or the like, the PC mat foundation The lifting pressure acting on the bottom surface of the block 10 is released, and the filter prevents the earth and sand from being ejected onto the artificial ground surface.
Even if a fault is formed under the artificial ground 1 by joining the PC artificial ground 1 to a plurality of PC mat foundation blocks 10 by a PC crimping method, the PC mat foundation block 10 rotates mutually. The deformation of the PC artificial ground is absorbed by the joint portion 2 to prevent an excessive stress from being generated inside the PC mat foundation block 10 and being destroyed.
図３は、ＰＣ人工地盤１の上に、接合部２に跨って建造物６を構築する場合を示すものであり、ラーメン構造の建造物６を免震装置５で支持すると共にＰＣマット基礎ブロック１０の接合部２を跨いて設置される梁部材６１の一端、若しくは両端をピン接合６２で連結し、ＰＣマット基礎ブロック１０の変位が建造物６に大きな影響を与えないようにしている。ピン接合６２であるため構造部材の破壊を局所的に押さえることができ、建造物６が使用不可能になる大きな被害を受けることがなく、連結部分を復旧することによって正常な状態に戻すことができるので復旧作業を短時間でコストをかけることなく行うことができる。
また、人工地盤１が変形した場合であっても、ＰＣマット基礎ブロック１０が回転可能に接合されていることから変位が小さなものとなり内部応力を抑制することができる。
FIG. 3 shows a case where a building 6 is constructed on the PC artificial ground 1 across the joint 2, and the ramen-structured building 6 is supported by the seismic isolation device 5 and the PC mat foundation block. One end or both ends of the beam member 61 installed across the ten joint portions 2 are connected by pin joints 62 so that the displacement of the PC mat foundation block 10 does not have a great influence on the building 6. Since it is the pin joint 62, the destruction of the structural member can be locally suppressed, and the building 6 is not damaged so much that it cannot be used. Therefore, the restoration work can be performed in a short time without cost.
Even when the artificial ground 1 is deformed, the PC mat foundation block 10 is rotatably joined, so that the displacement becomes small and the internal stress can be suppressed.
図４に示す例は、ＰＣ人工地盤１には予め柱の台座を設置するためのアンカーボルトまたはＰＣ鋼棒が所定の間隔で配設してあり、台座をアンカーボルトで固定するか、または、ＰＣ鋼棒で台座を人工地盤面に圧着して一体化し、この台座に柱を立ち上げて建造物６を構築するものである。
この建造物の場合も、ＰＣマット基礎ブロック１０の接合部２を跨ぐ梁部材６１の連結部は、少なくとも一方の連結部がピン接合６２としてある。
In the example shown in FIG. 4, anchor bolts or PC steel bars for installing column bases are arranged at predetermined intervals in the PC artificial ground 1 in advance, and the bases are fixed with anchor bolts, or A pedestal is pressure-bonded to the artificial ground surface with a PC steel rod and integrated, and a pillar is raised on this pedestal to construct the building 6.
Also in the case of this building, at least one of the connecting portions of the beam member 61 straddling the connecting portion 2 of the PC mat foundation block 10 is a pin joint 62.
図５に示す例は、ＰＣ人工地盤１が基礎杭３で支持されていると共にＰＣ人工地盤１を上に押上げる力、すなわち、基礎杭３に対して引抜き力が作用する場合、ＰＣマット基礎ブロック１０に鉛直地盤アンカー３５を設置することによって、地震によってＰＣ人工地盤１が浮き上がるのを防止するものであり、ＰＣ人工地盤１の耐震性能を向上させることができる。特に、直下型巨大地震による引抜力に対しては、鉛直地盤アンカー３５が有効である。
鉛直地盤アンカー３５は、接合部２におけるＰＣマット基礎ブロックの回転を許容するため、接合部の近傍に設けない。
In the example shown in FIG. 5, when the PC artificial ground 1 is supported by the foundation pile 3 and the PC artificial ground 1 is pushed up, that is, when a pulling force acts on the foundation pile 3, the PC mat foundation By installing the vertical ground anchor 35 in the block 10, the PC artificial ground 1 is prevented from being lifted by an earthquake, and the seismic performance of the PC artificial ground 1 can be improved. In particular, the vertical ground anchor 35 is effective against the pulling force caused by a direct type large earthquake.
The vertical ground anchor 35 is not provided in the vicinity of the joint portion in order to allow the PC mat foundation block to rotate at the joint portion 2.
１ ＰＣ人工地盤
１０ ＰＣマット基礎ブロック
１１ 拘束壁
１２ ＰＣ鋼材
２ 接合部
２０ 緊張材（全素線塗装型ＰＣ鋼より線）
３ 基礎杭
３５ 鉛直地盤アンカー
６ 建造物
６１ 梁部材
６２ ピン接合
Ｂ 地盤支持層
Ｓ 想定横滑り面
1 PC Artificial Ground 10 PC Mat Foundation Block 11 Restraint Wall 12 PC Steel 2 Joint 20 Tension Material (All Strand Paint Type PC Steel Strand)
3 Foundation pile 35 Vertical ground anchor 6 Building 61 Beam member 62 Pin joint B Ground support layer S Assumed skid surface
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| JPS537722A (en) * | 1976-07-09 | 1978-01-24 | Hitachi Shipbuilding Eng Co | Process and apparatus for production of prestressed concrete panels |
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| JPH06257292A (en) * | 1993-03-05 | 1994-09-13 | Takenaka Komuten Co Ltd | Construction of artificial ground |
| JPH07189238A (en) * | 1993-12-28 | 1995-07-28 | Hitachi Ltd | Block for preparing surface course ground and surface course ground using block thereof and utilizing method of block thereof |
| JPH11200395A (en) * | 1998-01-16 | 1999-07-27 | Sumitomo Metal Ind Ltd | Earthquake-resistant reinforcing structure of structure |
| JPH11256763A (en) * | 1998-03-13 | 1999-09-21 | Sumitomo Electric Ind Ltd | Unbonded anticorrosive pc steel stranded wire |
| JP2002004417A (en) * | 2000-06-19 | 2002-01-09 | Takenaka Komuten Co Ltd | Pc compression joint structure for precast concrete beam and column |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS537722A (en) * | 1976-07-09 | 1978-01-24 | Hitachi Shipbuilding Eng Co | Process and apparatus for production of prestressed concrete panels |
| JPH01304092A (en) * | 1988-06-01 | 1989-12-07 | Ohbayashi Corp | Preparation of waste disposal site |
| JPH06257292A (en) * | 1993-03-05 | 1994-09-13 | Takenaka Komuten Co Ltd | Construction of artificial ground |
| JPH07189238A (en) * | 1993-12-28 | 1995-07-28 | Hitachi Ltd | Block for preparing surface course ground and surface course ground using block thereof and utilizing method of block thereof |
| JPH11200395A (en) * | 1998-01-16 | 1999-07-27 | Sumitomo Metal Ind Ltd | Earthquake-resistant reinforcing structure of structure |
| JPH11256763A (en) * | 1998-03-13 | 1999-09-21 | Sumitomo Electric Ind Ltd | Unbonded anticorrosive pc steel stranded wire |
| JP2002004417A (en) * | 2000-06-19 | 2002-01-09 | Takenaka Komuten Co Ltd | Pc compression joint structure for precast concrete beam and column |
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