JP2006183407A - Reinforcing method of columnar structure - Google Patents
Reinforcing method of columnar structure Download PDFInfo
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- JP2006183407A JP2006183407A JP2004380405A JP2004380405A JP2006183407A JP 2006183407 A JP2006183407 A JP 2006183407A JP 2004380405 A JP2004380405 A JP 2004380405A JP 2004380405 A JP2004380405 A JP 2004380405A JP 2006183407 A JP2006183407 A JP 2006183407A
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- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 76
- 239000000945 filler Substances 0.000 claims description 6
- 238000010276 construction Methods 0.000 abstract description 7
- 229910000831 Steel Inorganic materials 0.000 description 14
- 239000010959 steel Substances 0.000 description 14
- 230000002787 reinforcement Effects 0.000 description 11
- 238000005192 partition Methods 0.000 description 8
- 239000002689 soil Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 239000004567 concrete Substances 0.000 description 5
- 238000009412 basement excavation Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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Abstract
Description
本発明は、既設の柱状構造物を補強するための方法および構造に関するものである。 The present invention relates to a method and a structure for reinforcing an existing columnar structure.
一部を地中に埋設した既設の地中構造物、例えば橋脚等の基礎（直接基礎、杭基礎、ケーソン基礎を問わない）においては、その老朽化対策や耐震性向上のために、地中および地上の柱状部周囲を鋼板で被覆し、鋼板と柱状部との間の隙間に、コンクリート、モルタル、樹脂等の充填材を充填することにより補強する場合がある。 In existing underground structures partially buried in the ground, such as foundations such as piers (regardless of direct foundations, pile foundations, caisson foundations), in order to prevent aging and improve earthquake resistance, In some cases, the periphery of the columnar portion on the ground is covered with a steel plate, and the gap between the steel plate and the columnar portion is filled with a filler such as concrete, mortar, or resin.
この種の補強方法の一例として、例えば特開２０００−３３６９４６号公報（特許文献１）には、橋脚の外周に円筒状の鋼板ブロックを形成した後、その外側に、上下の分割フレームおよびジャッキを有する圧入装置を配置し、ジャッキにより鋼板ブロックを押し下げて地中に侵入させ、以後、鋼板ブロックの組立と、その押し下げ動作を繰り返すことにより、鋼板ブロックで橋脚の外面を被覆する工法が開示されている。
ところで、既設の柱状構造物の断面形状（外周面の断面形状）は、一般的に円形状と四角筒等の角筒状とに大別される。従来の補強方法では、既設柱状構造物の外面の断面形状と鋼板ブロック等の被覆材の断面形状は基本的に相似形であり、例えば既設の柱状構造物が円形断面であれば、被覆材としても円筒型のものが使用されている（例えば前記特許文献１の図７参照）。 By the way, the cross-sectional shape of the existing columnar structure (the cross-sectional shape of the outer peripheral surface) is generally roughly classified into a circular shape and a rectangular tube shape such as a square tube. In the conventional reinforcing method, the cross-sectional shape of the outer surface of the existing columnar structure and the cross-sectional shape of the covering material such as the steel plate block are basically similar. For example, if the existing columnar structure is a circular cross-section, Also, a cylindrical type is used (for example, see FIG. 7 of Patent Document 1).
しかしながら、このように既設柱状構造物の外面と被覆材を相似形とすると、柱状構造物と被覆材とで強度の弱くなる荷重方向が一致するため、十分な補強効果を期待できない場合がある。例えば角筒では、その対対角線方向の荷重に比べ、各辺と平行方向の荷重に対する強度が劣るため、角筒状の柱状構造物を角筒状の補強材で補強しても、各辺と平行方向の荷重に対して十分な補強効果が得られないおそれがある。 However, if the outer surface of the existing columnar structure and the covering material are similar to each other, the load direction in which the strength decreases between the columnar structure and the covering material may coincide with each other, so that a sufficient reinforcing effect may not be expected. For example, in the case of a square tube, the strength against a load in a direction parallel to each side is inferior to the load in the diagonal direction. Therefore, even if a square columnar structure is reinforced with a square tube-shaped reinforcing material, There is a possibility that a sufficient reinforcing effect cannot be obtained with respect to the load in the parallel direction.
また、被覆材を地中に圧入する際、柱状構造物の外面と被覆材の内面との間の隙間は狭小（例えば５０ｍｍ程度）であるため、掘削地盤にこれよりも大きな礫等が出現した場合、当該隙間を介しての排土が困難となり、施工性能率が大幅に低下する。この場合、従来では、被覆材の外側の土砂を取り除いて大礫を被覆材の外側に押し出してから圧入する手法が取られているが、これでは周辺地盤がかく乱され、被覆材の支持力が不足する事態を招く場合がある。 In addition, when the covering material is pressed into the ground, the gap between the outer surface of the columnar structure and the inner surface of the covering material is narrow (for example, about 50 mm), so that larger gravel or the like appeared on the excavated ground. In this case, it becomes difficult to remove the soil through the gap, and the construction performance rate is greatly reduced. In this case, conventionally, a method of removing the earth and sand on the outside of the covering material and pushing out the gravel to the outside of the covering material and then press-fitting is taken, but this disturbs the surrounding ground, and the supporting force of the covering material is reduced. It may lead to a shortage.
そこで、本発明では、高い補強効果が得られ、かつ大礫の多い地盤でも低コストに施工可能となる柱状構造物の補強方法および補強構造の提供を目的とする。 Therefore, an object of the present invention is to provide a columnar structure reinforcement method and a reinforcement structure that can provide a high reinforcement effect and can be constructed at low cost even on ground with a large amount of gravel.
上記目的の達成手段として、本発明では、柱状構造物の外面を隙間の介在の下で被覆材によって被覆することにより、柱状構造物を補強するに際し、柱状構造物の外面が断面略角筒状であるとき、被覆材として略円筒状のものを使用することとした。これとは反対に、柱状構造物の外面が断面略円筒状であるとき、被覆材として略角筒状のものを使用する。 As means for achieving the above object, in the present invention, when reinforcing the columnar structure by covering the outer surface of the columnar structure with a covering material under the presence of a gap, the outer surface of the columnar structure has a substantially square cylindrical shape in cross section. In this case, a substantially cylindrical material was used as the covering material. On the contrary, when the outer surface of the columnar structure has a substantially cylindrical cross section, a substantially rectangular tube-shaped one is used as the covering material.
ここでの「略角筒」は、周方向の外面が複数の平坦面で形成されているものを意味する。角筒の角数は特に問わず、三つ以上の角数を有する筒状のものが使用可能であるが、通常は、コスト、施工性、その他を考慮して四角筒が使用される。図形的に厳密な意味での「角筒」に限らず、例えば各角部の面取りを行ったような形状も含まれる。また、「略円筒」は、周方向の外面が真円面または複数の曲率の異なる円弧面で形成されているものを意味し、外面の横断面形状が楕円であるような場合も含まれる。 Here, the “substantially square tube” means that the outer surface in the circumferential direction is formed by a plurality of flat surfaces. The number of corners of the rectangular tube is not particularly limited, and a cylindrical tube having three or more corners can be used. However, a rectangular tube is usually used in consideration of cost, workability, and the like. The shape is not limited to a “square tube” in a strict sense in terms of graphics, but includes a shape in which each corner is chamfered, for example. The “substantially cylindrical” means that the outer surface in the circumferential direction is formed by a perfect circle or a plurality of circular arc surfaces having different curvatures, and includes a case where the cross-sectional shape of the outer surface is an ellipse.
加えて本発明は、柱状構造物の外面を、隙間の介在の下で被覆材によって被覆すると共に、前記隙間に充填材を供給した構造において、柱状構造物の外面を断面略角筒状、被覆材を略円筒状とするものである。これとは反対に柱状構造物の外面を断面略円筒状、被覆材を略角筒状とすることもできる。 In addition, the present invention provides a structure in which the outer surface of the columnar structure is covered with a covering material under the presence of a gap, and the outer surface of the columnar structure is covered with a substantially rectangular tube in a structure in which a filler is supplied to the gap. The material is substantially cylindrical. On the other hand, the outer surface of the columnar structure can be formed into a substantially cylindrical section and the covering material can be formed into a substantially rectangular tube shape.
以上の構成を有する補強構造では、柱状構造物の外面と被覆材の内面との輪郭形状が異なるので、一方の部材の構造的に弱い荷重方向に対し、他方がこれを補う作用を呈するので、外力に対する強度を増すことができ、これにより耐震性等の向上を図ることができる。 In the reinforcing structure having the above configuration, since the contour shape of the outer surface of the columnar structure and the inner surface of the covering material is different, the other member exhibits an action to compensate for the structurally weak load direction of one member. The strength against external force can be increased, thereby improving the earthquake resistance and the like.
また、この補強構造では、柱状構造物の外面と被覆材の内面との間の隙間幅がその周方向で変化する。従って、補強工中に、掘削地盤に隙間幅以上の大礫や岩石が出現した場合も、これを隙間幅の大きい部分に移動させて浮上させれば、そのスムーズな排出が可能であり、掘削能率が高まると共に、周辺地盤のかく乱を防止することができる。 Moreover, in this reinforcement structure, the clearance gap between the outer surface of a columnar structure and the inner surface of a coating | covering material changes in the circumferential direction. Therefore, even if gravels or rocks larger than the gap width appear in the excavation ground during the reinforcement work, they can be smoothly discharged if they move to a part with a larger gap width and float. As the efficiency increases, the surrounding ground can be prevented from being disturbed.
また、被覆材をジャッキを使用して地中に圧入する場合でも、圧入力を被覆材に伝達するための加圧桁の支持スパンを長くすることができ、これにより安定した圧入作業を行うことが可能となる。 Also, even when the covering material is press-fitted into the ground using a jack, the support span of the pressure girder for transmitting the pressure input to the covering material can be lengthened, thereby performing a stable press-fitting operation. Is possible.
以上のように本発明によれば、柱状構造物の補強効果を大幅に高めることができ、かつその施工効率を向上させることができる。 As described above, according to the present invention, the reinforcing effect of the columnar structure can be greatly increased, and the construction efficiency can be improved.
以下、本発明の実施の形態を添付図面を参照して説明する。 Embodiments of the present invention will be described below with reference to the accompanying drawings.
図１および図２は、本発明方法の一実施形態として、既設橋脚１０の柱状部における補強工事の施工状況を示す。 FIG. 1 and FIG. 2 show the construction status of the reinforcement work in the columnar part of the existing pier 10 as one embodiment of the method of the present invention.
この補強工事は、橋脚１０の柱状部１０ａ外周に被覆材１２を配置し、これを圧入装置１１で地中に圧入することにより行われる。この実施形態において、柱状部１０ａの外面は角筒状（図面では正四角筒状を例示している）に形成されている。柱状部１０ａは、鋼やコンクリートで形成した中実状とする他、鋼板等で製作した中空筒状、あるいは中空筒の内部にコンクリート等を充填した複合構造であってもよい。 This reinforcement work is performed by placing the covering material 12 on the outer periphery of the columnar portion 10a of the pier 10 and press-fitting it with the press-fitting device 11 into the ground. In this embodiment, the outer surface of the columnar portion 10a is formed in a rectangular tube shape (a regular rectangular tube shape is illustrated in the drawing). The columnar part 10a may be a solid cylinder formed of steel or concrete, a hollow cylinder manufactured of a steel plate or the like, or a composite structure in which concrete or the like is filled inside the hollow cylinder.
図１に示すように、被覆材１２は、下端に刃口部１２１を有する円筒状（図示例では正四角筒状）に形成される。この被覆材１２は単純なストレート形状であるので低コストに製作可能であり、その素材も鋼板、鋼ブロック、コンクリート、カーボン系素材等の一定以上の強度を有する材料、あるいはこれらの組合せが広く使用可能である。被覆材１２の内面と柱状部１０ａの外面との間にはその全周にわたって隙間１３が形成される。隙間１３の幅は、図３に示すように、柱状部１０ａの外面の各辺中間部分で最も大きく（Ｗ１）、柱状部１０ａの各角部で最も小さくなる（Ｗ１）。隙間１３の幅の大きい部分Ｗ２は、後述のように大礫が浮上する際の通路となるが、この時の揚土効果を高めるため、隙間幅の大きい部分の周方向両側を隔壁１２０で仕切って排土部１３ａを形成するのが望ましい。図示例では、被覆材１２と一体形成した隔壁１２０でその周方向両側を仕切った場合を例示している。隔壁１２０の下端は、刃口部１２１付近での大礫の水平移動（後述する）を阻害しないように、被覆材１２の下端に設けられた刃口部１２１よりも高い位置に配置される。 As shown in FIG. 1, the coating | covering material 12 is formed in the cylindrical shape (in the example of illustration, regular square cylinder shape) which has the blade edge part 121 in the lower end. Since this covering material 12 has a simple straight shape, it can be manufactured at low cost, and the material is also widely used as a material having a certain level of strength such as a steel plate, steel block, concrete, carbon-based material, or a combination thereof. Is possible. Between the inner surface of the covering material 12 and the outer surface of the columnar portion 10a, a gap 13 is formed over the entire circumference. As shown in FIG. 3, the width of the gap 13 is largest at each side intermediate portion of the outer surface of the columnar portion 10a (W1) and smallest at each corner portion of the columnar portion 10a (W1). The wide portion W2 of the gap 13 serves as a passage when the gravel rises as will be described later, but in order to enhance the earthing effect at this time, both sides in the circumferential direction of the portion having the large gap width are partitioned by the partition walls 120. Thus, it is desirable to form the earth discharging part 13a. In the example of illustration, the case where the circumferential direction both sides are partitioned off with the partition 120 integrally formed with the coating | covering material 12 is illustrated. The lower end of the partition wall 120 is disposed at a position higher than the blade edge portion 121 provided at the lower end of the covering material 12 so as not to hinder horizontal movement (described later) of the gravel near the blade edge portion 121.
図１及び図２に例示する圧入装置１１は、被覆材１２の上端に配置した加圧桁１４と地盤にアンカーを取ったジャッキ１５とで構成される。ジャッキ１５としては、例えばセンターホールジャッキが使用可能である。地盤でアンカーを取りながらジャッキ１５を間欠的に駆動し、加圧桁１４を介して被覆材１２を間欠的に押し下げることによって被覆材１２が地盤に徐々に圧入される。 The press-fitting device 11 illustrated in FIGS. 1 and 2 includes a pressure girder 14 disposed at the upper end of the covering material 12 and a jack 15 having an anchor on the ground. For example, a center hole jack can be used as the jack 15. The jack 15 is intermittently driven while the anchor is being removed from the ground, and the covering material 12 is gradually pressed into the ground by intermittently pushing down the covering material 12 via the pressure girder 14.
この圧入装置１１は例示にすぎず、被覆材１２を地盤に圧入可能である限り他の構成の圧入装置１１を使用することもできる。例えば上記圧入装置１１はジャッキ１５の加圧力を、加圧桁１４を介して直接被覆材１２に作用させるものであるが、この加圧力を支圧柱を介して被覆材１２の刃口部１２１のみに作用させてもよい。すなわち、被覆材１２の刃口部１２１を鉄筋コンクリート造り等の剛体構造とし、この刃口部１２上の複数箇所にＨ型鋼等からなる支圧柱を立設し、この支圧柱の内側または外側に刃口部以外の被覆材１２を取り付ける。そして、ジャッキ１５の加圧力を支圧柱に作用させ、被覆材１２全体を地中に圧入する。この場合、ジャッキ１５の加圧力は刃口部１２１に作用し、刃口部１２１以外の被覆材１２にはほとんど加圧力が作用しないので、強度的に劣る薄肉の鋼板等を用いて被覆材１２の当該部分を低コストに形成することが可能となる。この支圧柱として、隔壁１２０を使用することもできる。これは、例えば隔壁１２０を刃口部１２１と強固に結合すると共に、隔壁１２０の上端を被覆材１２の上端よりも上方に突出させ、この突出部分に加圧桁１４を配置することによって行うことができる。 The press-fitting device 11 is merely an example, and any other press-fitting device 11 can be used as long as the covering material 12 can be press-fitted into the ground. For example, the press-fitting device 11 applies the pressure force of the jack 15 directly to the covering material 12 via the pressure beam 14, and this pressure force is applied to the blade edge portion 121 of the covering material 12 via the support column. You may act only on. That is, the cutting edge 121 of the covering material 12 has a rigid structure such as a reinforced concrete structure, and a supporting column made of H-shaped steel or the like is erected at a plurality of locations on the cutting edge 12, and the inside or outside of the supporting column is provided. A covering material 12 other than the blade opening is attached to the head. And the pressurizing force of the jack 15 is made to act on a supporting column, and the whole coating | covering material 12 is press-fit in the ground. In this case, the pressurizing force of the jack 15 acts on the blade edge portion 121, and almost no pressure force acts on the covering material 12 other than the blade edge portion 121. Therefore, the covering material 12 is formed using a thin steel plate or the like that is inferior in strength. This part can be formed at low cost. A partition wall 120 can also be used as the bearing column. This is performed by, for example, firmly coupling the partition wall 120 with the blade edge portion 121, projecting the upper end of the partition wall 120 upward from the upper end of the covering material 12, and disposing the pressure beam 14 on the projecting portion. Can do.
また、圧入装置１１としては、上述のようにジャッキ１５の圧入反力を地盤で取るものの他、柱状部１０ａで取るものも使用ことができる。 Further, as the press-fitting device 11, as well as the one that takes the press-fitting reaction force of the jack 15 on the ground as described above, the one that takes on the columnar part 10 a can also be used.
上記圧入工程においては、図３に示すように、柱状部１０ａの外面と被覆材１２の内面との間の隙間に複数の送水管１７を配置し、送水管１７先端のノズルから高圧ジェット水を噴出して被覆材１２の内周地盤を掘削することにより、硬質地盤であっても被覆材１２の圧入が可能となる。この送水管１７の設置個所は任意であるが、基本的には図示のように、大礫が移動する排土部１３ａを避けて、隙間の幅の狭い部分に配置するのが望ましい。 In the press-fitting step, as shown in FIG. 3, a plurality of water supply pipes 17 are arranged in a gap between the outer surface of the columnar portion 10 a and the inner surface of the covering material 12, and high-pressure jet water is supplied from a nozzle at the tip of the water supply pipe 17. By ejecting and excavating the inner peripheral ground of the covering material 12, it is possible to press-fit the covering material 12 even on a hard ground. The installation location of the water supply pipe 17 is arbitrary, but basically it is desirable that the water supply pipe 17 is arranged in a narrow gap portion, avoiding the soil removal portion 13a where the gravel moves.
このように地盤を掘削する場合、何らかの方法でスライム処理を行う必要がある。スライム処理手段としては、柱状部１０ａの外面と被覆材１２の内面との間の隙間下部に圧縮エアを供給して気泡を発生させ、そのエアリフト作用で空間内のスライムを排土部１３ａを介して地上に排出するエアリフト方式の他、サクションポンプ方式やサンドポンプ方式等も利用することができる。 When excavating the ground in this way, it is necessary to perform slime treatment by some method. As slime treatment means, compressed air is supplied to the lower part of the gap between the outer surface of the columnar part 10a and the inner surface of the covering material 12 to generate bubbles, and the slime in the space is discharged via the soil discharging part 13a by the air lift action. In addition to the air lift system that discharges to the ground, a suction pump system, a sand pump system, or the like can also be used.
以上の手順で最下段の被覆材１２を地中に圧入した後、その上に次段の被覆材１２を継ぎ足して同様の作業を行う。以下、この作業を繰り返し、図４に示すように、複数段の被覆材１２ａ〜１２ｇで柱状部１０ａの外周を被覆すると共に、柱状部１０ａの外面と被覆材１２の内面との間の隙間に、コンクリート、モルタル、樹脂等からなる充填材１８を供給することにより、補強作業が完了する。なお、被覆材の刃口部１２１は最下段の被覆材１２ａにのみ設けられていれば足り、他の被覆部材１２ｂ〜１２ｇは刃口部を省略して形成される。 After the lowermost covering material 12 is press-fitted into the ground according to the above procedure, the same operation is performed by adding the next covering material 12 thereon. Hereinafter, this operation is repeated, and as shown in FIG. 4, the outer periphery of the columnar part 10 a is covered with a plurality of steps of the covering materials 12 a to 12 g and at the gap between the outer surface of the columnar part 10 a and the inner surface of the covering material 12. By supplying the filler 18 made of concrete, mortar, resin or the like, the reinforcement work is completed. It is sufficient that the blade edge portion 121 of the covering material is provided only in the lowermost covering material 12a, and the other covering members 12b to 12g are formed by omitting the blade edge portion.
一般に、図１に示す角筒状の柱状部１０ａでは、対角線方向の荷重と比べ、各辺と平行方向の荷重に対する強度が劣る。そのため、従来のように被覆材１２も角筒状としたのでは、柱状部１０ａと被覆材１２とで強度の弱くなる荷重方向が一致するため、補強後も荷重方向により構造体の強度にバラツキが発生し、十分な補強効果を得ることができない。これに対して、上記のように、被覆材１２を、柱状部１０ａの外面の輪郭と異なる円筒状に形成すれば、この種の強度のバラツキを抑制することができ、高い補強効果が得られる。 In general, the columnar portion 10a having a rectangular tube shape shown in FIG. 1 is inferior in strength to a load in a direction parallel to each side as compared with a load in a diagonal direction. Therefore, if the covering material 12 is also formed in a rectangular tube shape as in the prior art, the load direction in which the strength decreases between the columnar portion 10a and the covering material 12 matches, and therefore the strength of the structure varies depending on the load direction even after reinforcement. Occurs, and a sufficient reinforcing effect cannot be obtained. On the other hand, if the covering material 12 is formed in a cylindrical shape different from the contour of the outer surface of the columnar portion 10a as described above, this kind of strength variation can be suppressed and a high reinforcing effect can be obtained. .
また、図３に示すように、隙間１３での掘削地盤、特に隙間幅の小さい掘削地盤に大礫２０が出現した場合でも、この大礫２０は圧力差によって隙間幅の大きい部分に運ばれ、隔壁１２０で仕切られた排土部１３ａを通って地上に浮上するので、掘削地盤の何れの部位で大礫２０が出現した場合でもこれをスムーズに地上に排出することが可能となる。その一方で、掘削地盤全体を大礫を排土できる寸法とする場合に比べ、掘削面積を少なくできるので、掘削土量の削減を通じて高い施工能率が得られる。また、周辺地盤のかく乱を抑えることができ、支持力不足による被覆材１２の異常沈下を防止することができる。 In addition, as shown in FIG. 3, even when the gravels 20 appear on the excavation ground in the gap 13, particularly in the excavation ground with a small gap width, the gravels 20 are carried to a portion having a larger gap width due to a pressure difference, Since it floats on the ground through the soil removal part 13a partitioned by the partition wall 120, even if the gravel 20 appears in any part of the excavated ground, it can be smoothly discharged to the ground. On the other hand, since the excavation area can be reduced as compared with the case where the entire excavated ground is sized so that the gravel can be discharged, high construction efficiency can be obtained through reduction of the excavated soil amount. In addition, the disturbance of the surrounding ground can be suppressed, and the abnormal settlement of the covering material 12 due to insufficient support force can be prevented.
さらに、図１に示すように、被覆材１２の上端には、圧入装置１１における加圧桁１４が架設されるが、柱状部１０ａと被覆材１２を相似形とする場合に比べ、被覆材１２に支持される加圧桁１４の支持スパンＬが拡大するため、加圧桁１４を安定して設置することができ、かつ被覆材１２を強度的に劣る鋼板等の薄肉材料で形成した場合でも、集中荷重による被覆材１２の変形を抑制することができる。 Further, as shown in FIG. 1, a pressure girder 14 in the press-fitting device 11 is installed on the upper end of the covering material 12, but compared with the case where the columnar portion 10 a and the covering material 12 are similar in shape. Since the support span L of the pressure girder 14 supported on the surface is enlarged, the pressure girder 14 can be stably installed, and the coating material 12 is formed of a thin material such as a steel plate having a low strength. The deformation of the covering material 12 due to the concentrated load can be suppressed.
図５は、図１に示す実施形態と異なり、柱状部１０ａが円筒状である場合の補強方法を示すものである。この場合、被覆材１２としては角筒状のものが使用される。この場合も図１に示す実施形態と同様に、荷重方向の相違による強度バラツキの抑制、大礫２０の出現による弊害防止、加圧桁１４の安定設置等の効果を得ることができる。 FIG. 5 shows a reinforcing method when the columnar part 10a is cylindrical, unlike the embodiment shown in FIG. In this case, the covering material 12 is a rectangular tube. In this case as well, as in the embodiment shown in FIG. 1, it is possible to obtain effects such as suppression of strength variation due to the difference in load direction, prevention of harmful effects due to the appearance of the gravels 20, and stable installation of the pressure girder 14.
このように被覆材１２として、角筒状のものを使用する場合、図６に示すように各角部に面取り１２２を設けたものも使用可能である。この場合、図５に示す実施形態に比べて掘削土量をさらに削減することができ、経済性が高まる。図１に示す実施形態において、外面が角筒状の柱状部１０ａに図６に示す実施形態と同様に面取りを設けることもできる。 As described above, when a rectangular tube-shaped material is used as the covering material 12, a material having chamfers 122 at each corner as shown in FIG. 6 can be used. In this case, the amount of excavated soil can be further reduced as compared with the embodiment shown in FIG. In the embodiment shown in FIG. 1, a chamfer can be provided on the columnar portion 10 a whose outer surface is a rectangular tube like the embodiment shown in FIG. 6.
なお、以上の説明では、ジャッキによる圧入方向を垂直方向とした場合を例示したが、ジャッキ１５による圧入力の作用方向はこれ以外の方向、例えば水平方向とすることもでき、これにより、例えば既設水道管やガス管等の補強工事にも本発明を適用することが可能となる。また、本発明方法は、地中に圧入する場合のみならず、煙突など地上の柱状構造物の補強にも適用することができる。 In the above description, the case where the press-fitting direction by the jack is the vertical direction is illustrated, but the direction of the pressure input by the jack 15 can be other directions, for example, the horizontal direction. The present invention can be applied to reinforcement work for water pipes and gas pipes. Further, the method of the present invention can be applied not only to press-fitting into the ground, but also to reinforcing columnar structures on the ground such as chimneys.
１０ 橋脚
１０ａ 柱状部（柱状構造物）
１１ 圧入装置
１２ 被覆材
１２０ 隔壁
１２１ 刃口部
１３ 隙間
１３ａ 排土部
１４ 加圧桁
１５ ジャッキ
１７ 送水管
１８ 充填材
10 Pier 10a Columnar part (columnar structure)
DESCRIPTION OF SYMBOLS 11 Press-fit apparatus 12 Coating | covering material 120 Partition 121 Blade edge part 13 Crevice 13a Soil discharging part 14 Pressing girder 15 Jack 17 Water pipe 18 Filler
Claims (4)
柱状構造物の外面が断面略角筒状であるとき、被覆材として略円筒状のものを使用することを特徴とする柱状構造物の補強方法。 When reinforcing the columnar structure by covering the outer surface of the columnar structure with a covering material under the presence of a gap,
A method for reinforcing a columnar structure, characterized in that when the outer surface of the columnar structure has a substantially rectangular tube cross section, a substantially cylindrical shape is used as the covering material.
柱状構造物の外面が断面略円筒状であるとき、被覆材として略角筒状のものを使用することを特徴とする柱状構造物の補強方法。 When reinforcing the columnar structure by covering the outer surface of the columnar structure with a covering material under the presence of a gap,
A method for reinforcing a columnar structure, characterized in that when the outer surface of the columnar structure is substantially cylindrical in cross section, a substantially rectangular tube-shaped one is used as the covering material.
柱状構造物の外面が断面略角筒状で、被覆材が略円筒状であることを特徴とする柱状構造物の補強構造。 In the structure in which the outer surface of the columnar structure is covered with a covering material under the presence of a gap, and a filler is supplied to the gap,
A reinforcing structure for a columnar structure, wherein the outer surface of the columnar structure has a substantially rectangular tube cross section and the covering material has a substantially cylindrical shape.
柱状構造物の外面が断面略円筒状で、被覆材が略角筒状であることを特徴とする柱状構造物の補強構造。
In the structure in which the outer surface of the columnar structure is covered with a covering material under the presence of a gap, and a filler is supplied to the gap,
A reinforcing structure for a columnar structure, characterized in that the outer surface of the columnar structure has a substantially cylindrical cross section and the covering material has a substantially rectangular tube shape.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009209548A (en) * | 2008-03-03 | 2009-09-17 | Nippon Steel Corp | Foundation reinforcing construction method for existing structure |
| JP2012167473A (en) * | 2011-02-14 | 2012-09-06 | Oriental Shiraishi Corp | Reinforcement structure and reinforcement method of columnar structure |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09125317A (en) * | 1995-10-27 | 1997-05-13 | Nippon Steel Corp | Reinforced construction of reinforced concrete column base and reinforcing method thereof |
| JPH11158820A (en) * | 1997-12-01 | 1999-06-15 | Hanshin Expressway Public Corp | Earthquake-proof reinforcement method for underground column |
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2004
- 2004-12-28 JP JP2004380405A patent/JP4699023B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09125317A (en) * | 1995-10-27 | 1997-05-13 | Nippon Steel Corp | Reinforced construction of reinforced concrete column base and reinforcing method thereof |
| JPH11158820A (en) * | 1997-12-01 | 1999-06-15 | Hanshin Expressway Public Corp | Earthquake-proof reinforcement method for underground column |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009209548A (en) * | 2008-03-03 | 2009-09-17 | Nippon Steel Corp | Foundation reinforcing construction method for existing structure |
| JP2012167473A (en) * | 2011-02-14 | 2012-09-06 | Oriental Shiraishi Corp | Reinforcement structure and reinforcement method of columnar structure |
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