JP7049976B2 - Construction method of Shinbashira - Google Patents

Construction method of Shinbashira Download PDF

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JP7049976B2
JP7049976B2 JP2018220542A JP2018220542A JP7049976B2 JP 7049976 B2 JP7049976 B2 JP 7049976B2 JP 2018220542 A JP2018220542 A JP 2018220542A JP 2018220542 A JP2018220542 A JP 2018220542A JP 7049976 B2 JP7049976 B2 JP 7049976B2
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俊介 佐藤
収一 味岡
慎吾 柏原
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本発明は、地盤に形成した孔内にコンクリートを打設した後、孔内の打設コンクリートに構真柱を建て込む構真柱施工方法に関する。 The present invention relates to a method for constructing a structural pillar in which concrete is placed in a hole formed in the ground and then a structural pillar is built in the concrete placed in the hole.

逆打ち工法の実施に伴う構真柱の後建て工法では、一般的には、地盤に構真柱建て込み用の孔を掘削し、構真柱の根固め部に鉄筋篭を建て込み、二次スライム処理を実施した後に根固め用のコンクリートを打設する。しかる後、構真柱をそれの上端部に連結されたヤットコ（建て込み補助治具）を介して揚重機で鉛直姿勢に吊下げる。吊下げられた構真柱を孔内に挿入して落とし込むことにより、構真柱の根入れ部を自重で打設コンクリートに建て込む。このとき、打設コンクリートに根入れされる構真柱には大きな浮力を受けるため、建て込み時に構真柱の位置保持が難しく、構真柱の建て込みに時間を要する。 In the post-building method of the skeleton pillar accompanying the implementation of the reverse striking method, in general, a hole for building the skeleton pillar is excavated in the ground, and a reinforcing bar cage is built in the root consolidation part of the skeleton pillar. After performing the next slime treatment, concrete for rooting is placed. After that, the structure pillar is hung in a vertical position by a lifting machine via a yatko (building auxiliary jig) connected to the upper end of the pillar. By inserting the suspended Shinbashira into the hole and dropping it, the root of the Shinbashira is built into the cast concrete by its own weight. At this time, since the structure pillars embedded in the cast concrete receive a large buoyancy, it is difficult to maintain the position of the structure pillars at the time of building, and it takes time to build the structure pillars.

そこで、従来では、特許文献１に示すように、高周波型加振機（加振装置）を用いた構真柱の建て込み方法が提案されている。この構真柱の建て込み方法では、揚重機の吊下げ部と構真柱の上端部との間に、構真柱に振動を付与する高周波型加振機を配設し、揚重された構真柱に高周波型加振機で振動を付与する。この加振状態にある構真柱を、孔内の打設コンクリートに落とし込むことにより、構真柱の周囲のコンクリート部分を液状化させて粘土を低下させながら、構真柱を建て込む。 Therefore, conventionally, as shown in Patent Document 1, a method of building a structural pillar using a high-frequency vibration exciter (vibration device) has been proposed. In this method of building the Shinbashira, a high-frequency vibration exciter that applies vibration to the Shinbashira is placed between the hanging part of the lifting machine and the upper end of the Shinbashira, and the work is lifted. Vibration is applied to the Shinbashira with a high-frequency vibrator. By dropping the structure pillar in this vibration state into the cast concrete in the hole, the structure pillar is built while liquefying the concrete part around the structure pillar and lowering the clay.

特開２００２－１２９５６２号公報Japanese Unexamined Patent Publication No. 2002-129562

しかしながら、上述の構真柱の建て込み方法では、揚重された重量のある構真柱を振動させるだけの出力を有する高価な高周波型加振機が必要で、施工コストが嵩む。また、高周波型加振機を所定のタイミングで作動及び停止させる必要があるので施工手順も複雑になる不都合がある。 However, the above-mentioned method for building a structural pillar requires an expensive high-frequency vibration exciter having an output sufficient to vibrate the lifted heavy structural pillar, which increases the construction cost. In addition, since it is necessary to operate and stop the high-frequency vibration exciter at a predetermined timing, there is a disadvantage that the construction procedure becomes complicated.

この実情に鑑み、本発明の主たる課題は、構真柱の建て込み補助治具であるヤットコの合理的な改良により、施工コストの増大抑制と施工手順の簡素化を図りながら、構真柱を浮力に抗して効率良く確実に建て込むことのできる構真柱施工方法を提供する点にある。 In view of this situation, the main problem of the present invention is to improve the construction cost and simplify the construction procedure by rational improvement of Yatco, which is an auxiliary jig for building the construction pillar. The point is to provide a construction method for shinbashira that can be built efficiently and reliably against buoyancy.

本発明の第１特徴構成は、地盤に形成した孔内にコンクリートを打設した後、ヤットコに錘を付加した錘付きヤットコを用いて前記孔内に構真柱を落とし込むことにより、前記構真柱を建て込む構真柱施工方法において、
前記錘付きヤットコが、前記ヤットコの少なくとも一部に形成した中空状の錘収容部内に、前記錘としての重量材を収容して構成される点にある。 The first characteristic configuration of the present invention is to pour concrete into a hole formed in the ground, and then drop a shinbashira into the hole using a weighted hammer with a weight added to the hammer. In the construction method of building a pillar
The point is that the weighted yatko is configured by accommodating a heavy material as the weight in a hollow weight accommodating portion formed in at least a part of the weight .

上記構成によれば、コンクリート打設後に構真柱を建て込む後建て工法において、ヤットコに錘を付加した錘付きヤットコを用いることで、当該錘付きヤットコの重量を構真柱に作用させ、構真柱の自重による落ち込み力を高めることができる。ここで、錘付きヤットコは、安価な材料や廃材等を錘に利用して低コストで構成することができるので、コストの増大を抑制することができる。また、錘付きヤットコの重量が加えられた構真柱を孔内に沿って落とし込むだけで済むので、構真柱に高周波型加振機で振動を付与する従来方法のように、施工中の特定のタイミングで振動を付与する操作も不要で、施工手順が複雑化することも回避することができる。
したがって、構真柱の建て込み補助治具であるヤットコの上述の合理的な改良により、孔内での落とし込み時に生じる大きな浮力に抗して構真柱を効率良く確実に建て込むことができる。 According to the above configuration, in the post-construction method in which the structure pillar is built after concrete is placed, the weight of the weighted yatko is applied to the structure pillar by using the weighted yatko with a weight added to the yatko. It is possible to increase the depression force due to the weight of the true pillar. Here, since the Yatco with a weight can be constructed at low cost by using an inexpensive material, waste material, or the like for the weight, it is possible to suppress an increase in cost. In addition, since it is only necessary to drop the structure pillar with the weight of the weighted Yatko along the inside of the hole, it is specified during construction as in the conventional method of applying vibration to the structure pillar with a high-frequency vibration exciter. It is not necessary to apply vibration at the timing of, and it is possible to avoid complicated construction procedure.
Therefore, by the above-mentioned rational improvement of Yatco, which is an auxiliary jig for building the structure pillar, the structure pillar can be efficiently and surely built against the large buoyancy generated when the structure is dropped in the hole.

更に、上記構成によれば、ヤットコの少なくとも一部に形成した中空状の錘収容部内に重量材を収容するので、重量材として成形されていない非常に安価な材料（例えば、多数のベアリング材（廃材）、解体ガラ（廃材）、流動化処理土、砕石）を用いることができる。よって、錘付きヤットコを一層低コストで構成することができ、構真柱を一層効率良く建て込むことができる。
また、その施工現場で必要な重量となるように重量材の種別（比重）を選択してヤットコに収容させることで、その施工現場に適した錘付きヤットコを容易に構成することができる。 Further, according to the above configuration, since the heavy material is housed in the hollow weight accommodating portion formed in at least a part of the yatco, a very inexpensive material that is not formed as a heavy material (for example, a large number of bearing materials (for example, a large number of bearing materials). Waste material), dismantled waste (waste material), fluidized soil, crushed stone) can be used. Therefore, it is possible to construct a yatko with a weight at a lower cost, and it is possible to build a structural pillar more efficiently.
Further, by selecting the type (specific weight) of the heavy material so as to have the weight required at the construction site and accommodating it in the yatko, it is possible to easily construct a yatko with a weight suitable for the construction site.

本発明の第２特徴構成は、前記錘収容部が、クロスＨ鋼の隣り合うウェブの内面とこれに連続する隣り合うフランジの内面とで囲まれた内部空間を封鎖して構成される点にある。 The second characteristic configuration of the present invention is that the weight accommodating portion is configured by sealing the internal space surrounded by the inner surface of the adjacent web of the cross H steel and the inner surface of the adjacent flanges continuous thereto. be.

上記構成によれば、クロスＨ鋼の隣り合うフランジの内面とこれに連続する隣り合うウェブの内面とで囲まれた内部空間を封鎖することで、錘としての重量材を収容可能な中空状の錘収容部を備えたヤットコを安価に構成することができる。しかも、錘収容部の内面にクロスＨ鋼のウェブを備えることで、当該錘収容部の保形性を向上することができる。よって、錘付きヤットコを更に一層低コストで効率良く構成することができる。 According to the above configuration, the hollow shape capable of accommodating a heavy material as a weight by sealing the internal space surrounded by the inner surface of the adjacent flanges of the cross H steel and the inner surface of the adjacent webs connected thereto. A yatko equipped with a weight accommodating portion can be constructed at low cost. Moreover, by providing a web of cross H steel on the inner surface of the weight accommodating portion, the shape retention of the weight accommodating portion can be improved. Therefore, the hammer with a weight can be efficiently configured at even lower cost.

本発明の第３特徴構成は、前記構真柱が下端を閉塞した鋼管柱である点にある。 The third characteristic configuration of the present invention is that the structural pillar is a steel pipe pillar with the lower end closed.

上記構成によれば、前記構真柱が下端を閉塞した鋼管柱の場合、後建て工法において、孔内での落とし込み時に大きな浮力を受ける。この状態で従来方法のように構真柱を加振しても、構真柱に落ち込み力を付加することはできない。しかし、本発明では、錘付きヤットコを用いるので、当該錘付きヤットコの重量を構真柱に作用させ、構真柱の自重による落ち込み力を高めることができる。これにより、構真柱が鋼管柱であっても、孔内で生じる大きな浮力に抗して構真柱を効率良く確実、容易に建て込むことができる。 According to the above configuration, in the case of a steel pipe column in which the structural pillar is closed at the lower end, a large buoyancy is received when the column is dropped in the hole in the rear-building method. Even if the structural pillar is vibrated in this state as in the conventional method, it is not possible to apply a dip force to the structural pillar. However, in the present invention, since the weighted yatko is used, the weight of the weighted yatko can be applied to the structure pillar to increase the falling force due to the weight of the structure pillar. As a result, even if the structural pillar is a steel pipe pillar, the structural pillar can be efficiently, reliably and easily built against the large buoyancy generated in the hole.

本発明の構真柱施工方法を示す縦断側面図Longitudinal side view showing the construction method of the structural Shinbashira of the present invention 錘付きヤットコの正面図Front view of Yatko with a weight 錘付きヤットコの縦断側面図Longitudinal side view of a hammer with a weight 図２のＩＶ－ＩＶ線断面図FIG. 2 is a sectional view taken along line IV-IV. 図２のＶ－Ｖ線断面図FIG. 2 is a sectional view taken along line VV. 図２のＶＩ－ＶＩ線断面図FIG. 2 is a sectional view taken along line VI-VI.

本発明の実施形態を図面に基づいて説明する。
図１は、逆打ち工法の実施に伴う構真柱１の後建て工法を示す。この構真柱１の後建て工法では、施工現場の地盤２に、地盤安定液（ベントナイト、泥水等）８を満たしながら鉛直方向に沿って所定深度まで構真柱建込み用の孔（杭孔）３を掘削形成する。この建込み用孔３内には、孔壁面の崩壊を防止するための円形断面の孔保護用のケーシング４が建て込まれている。建込み用孔３における構真柱１の根入れ部１Ａに相当する根固め領域には鉄筋篭（図示省略）が建て込まれている。そして、二次スライム処理を実施した後に、建込み用孔３内に根固め用のコンクリート５を打設する。 An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a post-construction method of the structure Shinbashira 1 accompanying the implementation of the reverse striking method. In this post-construction method of the Shinbashira 1, the ground 2 at the construction site is filled with the ground stabilizing liquid (bentonite, muddy water, etc.) 8 and the holes (pile holes) for building the Shinbashira up to a predetermined depth along the vertical direction. ) 3 is excavated and formed. A casing 4 for protecting a hole having a circular cross section for preventing the collapse of the wall surface of the hole is built in the hole 3 for building. A reinforcing bar cage (not shown) is built in the root consolidation region corresponding to the rooting portion 1A of the structural pillar 1 in the building hole 3. Then, after performing the secondary slime treatment, the concrete 5 for rooting is placed in the building hole 3.

また、構真柱１の上端部に、図３、図５、図６に示す錘６を付加した錘付きヤットコ（建て込み補助治具）７を連結し、この錘付きヤットコ７を介してクローラクレーン等の揚重機５０で鉛直姿勢に吊下げる。吊下げられた構真柱１を建込み用孔３内に挿入して落とし込むことにより、構真柱１の根入れ部１Ａを、構真柱１の重量及び錘付きヤットコ７の重量によって建込み用孔３内の根固め領域に打設されているコンクリート５に建て込む。 Further, a weighted yatko (building auxiliary jig) 7 to which the weights 6 shown in FIGS. 3, 5, and 6 are added is connected to the upper end of the structural pillar 1, and a crawler is connected via the weighted yatko 7. Suspend in a vertical position with a lifting machine 50 such as a crane. By inserting the suspended structure pillar 1 into the building hole 3 and dropping it, the rooting portion 1A of the structure pillar 1 is built by the weight of the structure pillar 1 and the weight of the weighted concrete 7. It is built in the concrete 5 placed in the root consolidation area in the hole 3.

コンクリート５打設後に構真柱１を建て込む後建て工法においては、吊下げられた構真柱１を建込み用孔３内に挿入して落とし込む際、構真柱１は大きな浮力を受ける。この大きな浮力は、建込み用孔３内の上層に存在する地盤安定液８の安定液層において構真柱１が受ける揚圧力と、建込み用孔３内の下層に存在する打設コンクリート５のコンクリート層において構真柱１が受ける揚圧力と、の和からなる。 In the post-building method in which the structure pillar 1 is built after the concrete 5 is placed, the structure pillar 1 receives a large buoyancy when the suspended structure pillar 1 is inserted into the building hole 3 and dropped. This large buoyancy is due to the lifting pressure received by the structural pillar 1 in the stabilizing liquid layer of the ground stabilizing liquid 8 existing in the upper layer in the building hole 3 and the cast concrete 5 existing in the lower layer in the building hole 3. It consists of the sum of the lifting pressure received by the Shinbashira 1 in the concrete layer of.

特に、本実施形態においては、構真柱１は、下端開口部を管端プレート１Ｃで閉塞してある閉断面の角管状の鋼管柱から構成されており、この構真柱１の柱本体部１Ｂと根入れ部１Ａとは同形のボックス型に構成されている。これにより、例えば、構真柱１が開断面の鉄骨柱から構成されている場合と比べて、吊下げられた構真柱１を建込み用孔３内に挿入して落とし込む際の浮力は大きくなる。 In particular, in the present embodiment, the structural pillar 1 is composed of a square tubular steel pipe pillar having a closed cross section in which the lower end opening is closed by the pipe end plate 1C, and the pillar main body portion of the structural pillar 1 is formed. The 1B and the rooting portion 1A are configured in a box shape having the same shape. As a result, for example, the buoyancy when the suspended structure pillar 1 is inserted into the building hole 3 and dropped is larger than that in the case where the structure pillar 1 is composed of a steel frame pillar having an open cross section. Become.

しかしながら、上述のように、錘６を付加した錘付きヤットコ７を用いることで、当該錘付きヤットコ７の重量を構真柱１に作用させ、構真柱１の自重による落ち込み力を高めることができる。これにより、建込み用孔３内での落とし込み時に生じる大きな浮力に抗して構真柱１を効率良く確実に建て込むことができる。
また、錘付きヤットコ７は、安価な材料や廃材等を錘６に利用して低コストで構成することができるので、コストの増大を抑制することができる。また、錘付きヤットコ７の重量が加えられた構真柱１を建込み用孔３内に沿って落とし込むだけで済むので、構真柱１に高周波型加振機で振動を付与する従来方法のように、施工中の特定のタイミングで振動を付与する操作も不要で、施工手順の複雑化も回避することができる。
さらに、構真柱１の柱本体部１Ｂと根入れ部１Ａとは、同形のボックス型に構成してあるので、建込み用孔３内での落とし込み時に大きな浮力を受けるものの、構真柱１の柱本体部１Ｂと根入れ部１Ａとを作り替える必要がなく、構真柱１の加工・溶接を減らし、省人化やロ－コスト化を図ることができる。 However, as described above, by using the weighted Yatko 7 to which the weight 6 is added, the weight of the weighted Yatko 7 can be applied to the structure pillar 1 to increase the falling force due to the weight of the structure pillar 1. can. As a result, the structural pillar 1 can be efficiently and reliably built against the large buoyancy generated when the building is dropped in the building hole 3.
Further, since the Yatco 7 with a weight can be constructed at a low cost by using an inexpensive material, waste material, or the like for the weight 6, it is possible to suppress an increase in cost. Further, since it is only necessary to drop the structure pillar 1 to which the weight of the weighted Yatco 7 is added along the inside of the building hole 3, the conventional method of applying vibration to the structure pillar 1 with a high-frequency vibration exciter is used. As described above, it is not necessary to apply vibration at a specific timing during construction, and it is possible to avoid complication of the construction procedure.
Further, since the pillar main body portion 1B and the rooting portion 1A of the structural pillar 1 are configured in a box shape having the same shape, a large buoyancy is received when the pillar main body portion 1B and the rooting portion 1A are dropped in the building hole 3, but the structural true pillar 1 It is not necessary to remake the pillar main body portion 1B and the rooting portion 1A, and the processing and welding of the structural pillar 1 can be reduced, labor saving and low cost can be achieved.

次に、錘付きヤットコ７について説明する。
ヤットコ７は、図１に示すように、構真柱１の根入れ部１Ａが建込み用孔３内の打設コンクリート５に所定深さまで根入れされたとき、構真柱１の上端部からケーシング４の上端開口部４ａよりも上方の所定高さ位置にまで及ぶ長さのクロスＨ鋼１１を主要構成として備える。このクロスＨ鋼１１は、図２～図６に示すように、十字状に交差する各ウェブ１１Ａの先端にフランジ１１Ｂが略「Ｔ」の字状に一体形成されている。
また、クロスＨ鋼１１の各フランジ１１Ｂの上端部には、図２に示すように、揚重機５０の吊下げワイヤ５１等に係止可能な吊下げピース１３が設けられ、各フランジ１１Ｂの下端部には、構真柱１の上端部と連結するためのエレクションピース１４が設けられている。 Next, the Yatco 7 with a weight will be described.
As shown in FIG. 1, the Yatco 7 is formed from the upper end portion of the structural steel pillar 1 when the rooting portion 1A of the structural steel pillar 1 is rooted in the cast concrete 5 in the building hole 3 to a predetermined depth. A cross H steel 11 having a length extending to a predetermined height position above the upper end opening 4a of the casing 4 is provided as a main configuration. As shown in FIGS. 2 to 6, the cross H steel 11 has a flange 11B integrally formed in a substantially “T” shape at the tip of each web 11A intersecting in a cross shape.
Further, as shown in FIG. 2, a hanging piece 13 that can be locked to the hanging wire 51 or the like of the lifting machine 50 is provided at the upper end of each flange 11B of the cross H steel 11, and the lower end of each flange 11B is provided. The portion is provided with an erection piece 14 for connecting to the upper end portion of the structural steel pillar 1.

ヤットコ７の上下中間部における下方側に偏位した領域には、図２～図６に示すように、錘６としての所定数量の重量材２６を収容可能な中空状の錘収容部２０が形成されている。この錘収容部２０は、図３、図５、図６に示すように、クロスＨ鋼１１の隣り合うウェブ１１Ａの内面と隣り合うフランジ１１Ｂの内面とで囲まれた４つの内部空間２５を封鎖して構成される。詳しくは、錘収容部２０は、クロスＨ鋼１１の周方向で隣り合うフランジ１１Ｂ間の隙間を封鎖する状態で、周方向で隣り合う各組の両フランジ１１Ｂの隣接側辺に亘って溶接等で固着される鋼板製の側板部２１と、各側板部２１の下端とクロスＨ鋼１１のフランジ及びウェブ１１Ａの各内側面との間で形成される下方開口を封鎖する鋼板製の底板部２２と、各側板部２１の上端とクロスＨ鋼１１のフランジ及びウェブ１１Ａの各内側面との間で形成される上方開口の錘投入口２３を封鎖可能な鋼板製の天板部２４と、を備える。 As shown in FIGS. 2 to 6, a hollow weight accommodating portion 20 capable of accommodating a predetermined amount of the weight material 26 as the weight 6 is formed in the region displaced downward in the upper and lower intermediate portions of the Yatco 7. Has been done. As shown in FIGS. 3, 5, and 6, the weight accommodating portion 20 seals four internal spaces 25 surrounded by the inner surface of the adjacent web 11A of the cross H steel 11 and the inner surface of the adjacent flange 11B. It is composed of. Specifically, the weight accommodating portion 20 is welded over the adjacent side surfaces of both flanges 11B of each set adjacent in the circumferential direction while closing the gap between the flanges 11B adjacent to each other in the circumferential direction of the cross H steel 11. The steel plate side plate portion 21 to be fixed by, and the steel plate bottom plate portion 22 that closes the lower opening formed between the lower end of each side plate portion 21 and the flange of the cross H steel 11 and each inner side surface of the web 11A. And a steel plate top plate portion 24 capable of closing the weight insertion port 23 of the upper opening formed between the upper end of each side plate portion 21 and the flange of the cross H steel 11 and each inner side surface of the web 11A. Be prepared.

上述のように、クロスＨ鋼１１の隣り合うウェブ１１Ａの内面とこれに連続する隣り合うフランジ１１Ｂの内面とで囲まれた４つの内部空間２５の各々は、図３、図５、図６に示すように、側板部２１の内面と、底板部２２の内面と、天板部２４の内面と、で封鎖され、封鎖された各内部空間２５の各々が錘収容部２０の錘収容室に構成されている。
さらに、図２、図３、図６に示すように、クロスＨ鋼１１における錘収容部２０の形成領域のうち、該錘収容部２０の全長の約７割強に及ぶ中間部位には、クロスＨ鋼１１の各フランジ１１Ｂの外側面に接する又は近接する角鋼管製の補強管１５が外嵌状態で溶接等にて固着されている。 As described above, each of the four internal spaces 25 surrounded by the inner surface of the adjacent web 11A of the cross H steel 11 and the inner surface of the adjacent flange 11B continuous thereto is shown in FIGS. 3, 5, and 6. As shown, each of the internal spaces 25 sealed and closed by the inner surface of the side plate portion 21, the inner surface of the bottom plate portion 22, and the inner surface of the top plate portion 24 is configured as the weight accommodating chamber of the weight accommodating portion 20. Has been done.
Further, as shown in FIGS. 2, 3 and 6, in the intermediate portion of the weight accommodating portion 20 formed in the cross H steel 11, the intermediate portion extending over about 70% of the total length of the weight accommodating portion 20 is crossed. A reinforcing pipe 15 made of a square steel pipe in contact with or close to the outer surface of each flange 11B of the H steel 11 is fixed by welding or the like in an outer fitting state.

錘収容部２０の４つの内部空間２５に収容する重量材２６により、構真柱１の重量と錘付きヤットコ７の重量との総重量が、建込み用孔３内での落とし込み時に生じる浮力よりも大きくなるように設定する。そのため、錘収容部２０の各内部空間２５に収容する重量材２６の総収納重量は、浮力に対抗できない不足分の重量となる。好ましくは、構真柱１を建込み用孔３内に挿入して落とし込む際、構真柱１が建込み用孔３内の安定液層及びコンクリート層を確実に沈下移動することのできる総収納重量に設定する。 Due to the weight material 26 accommodated in the four internal spaces 25 of the weight accommodating portion 20, the total weight of the weight of the structural pillar 1 and the weight of the Yatco 7 with a weight is calculated from the buoyancy generated when the weight is dropped in the building hole 3. Is also set to be large. Therefore, the total storage weight of the weight material 26 accommodated in each internal space 25 of the weight accommodating portion 20 is a shortage weight that cannot counter the buoyancy. Preferably, when the structural pillar 1 is inserted into the building hole 3 and dropped, the structural pillar 1 can reliably subside and move the stabilizing liquid layer and the concrete layer in the building hole 3. Set to weight.

上述のように、クロスＨ鋼１１の隣り合うフランジ１１Ｂどうしの隙間を鋼板製の側板部２１で封鎖し、且つ、少なくとも各側板部２１の下端とクロスＨ鋼１１のウェブ１１Ａ及びフランジ１１Ｂの各内面との間で形成される下方開口を鋼板製の底板部２２で封鎖することにより、錘６としての重量材２６を収容可能な中空状の錘収容部２０を備えたヤットコ７を安価に構成することができる。しかも、錘収容部２０の各内部空間２５の内面にクロスＨ鋼１１のウェブ１１Ａを備えることで、錘収容部２０の保形性を向上することができる。 As described above, the gap between the adjacent flanges 11B of the cross H steel 11 is closed by the side plate portion 21 made of a steel plate, and at least the lower end of each side plate portion 21 and the web 11A and the flange 11B of the cross H steel 11 are each. By sealing the lower opening formed between the inner surface and the lower opening with the bottom plate portion 22 made of steel plate, the Yatco 7 having the hollow weight accommodating portion 20 capable of accommodating the heavy material 26 as the weight 6 is inexpensively configured. can do. Moreover, by providing the web 11A of the cross H steel 11 on the inner surface of each internal space 25 of the weight accommodating portion 20, the shape retention of the weight accommodating portion 20 can be improved.

錘収容部２０の各内部空間２５に収容する重量材２６としては、成形されていない非常に安価な材料（例えば、多数のパチンコ球、ベアリング材（廃材）、解体ガラ（廃材）、流動化処理土、砕石、鉄粉、金属切板等）を用いることができる。よって、錘付きヤットコ７を一層低コストで構成することができ、構真柱１を一層効率良く建て込むことができる。
また、その施工現場で必要な重量となるように重量材２６の種別（比重）を選択してヤットコ７の錘収容部２０に収容させることで、その施工現場に適した錘付きヤットコ７を容易に構成することができる。 As the heavy material 26 to be accommodated in each internal space 25 of the weight accommodating portion 20, a very inexpensive material that has not been molded (for example, a large number of pachinko balls, a bearing material (waste material), a dismantled waste material (waste material), and fluidization treatment). Soil, crushed stone, iron powder, metal cutting board, etc.) can be used. Therefore, the Yatco 7 with a weight can be configured at a lower cost, and the Shinbashira 1 can be built more efficiently.
Further, by selecting the type (specific weight) of the heavy material 26 so as to have the weight required at the construction site and accommodating it in the weight accommodating portion 20 of the yatko 7, it is easy to make the yatko 7 with a weight suitable for the construction site. Can be configured in.

また、ヤットコ７に設ける重量材２６としては、金属製の切板やコンクリート板等の重量板を用いることができる。この場合には、上述のような中空状の錘収容部２０を形成しないで外付け形成で実施することも可能である。 Further, as the heavy material 26 provided in the Yatco 7, a heavy plate such as a metal cutting plate or a concrete plate can be used. In this case, it is also possible to carry out the external formation without forming the hollow weight accommodating portion 20 as described above.

〔その他の実施形態〕
（１）上述の実施形態では、クロスＨ鋼１１の隣り合うウェブ１１Ａの内面と隣り合うフランジ１１Ｂの内面とで囲まれた４つの内部空間２５の各々を、錘収容部２０の錘収容室に構成したが、径方向で相対向する一対の内部空間２５を、錘収容部２０の錘収容室に構成してもよい。 [Other embodiments]
(1) In the above-described embodiment, each of the four internal spaces 25 surrounded by the inner surface of the adjacent web 11A of the cross H steel 11 and the inner surface of the adjacent flange 11B is placed in the weight accommodating chamber of the weight accommodating portion 20. Although configured, the pair of internal spaces 25 facing each other in the radial direction may be configured in the weight accommodating chamber of the weight accommodating portion 20.

（２）上述の実施形態では、錘６としての重量材２６を収容する中空状の錘収容部２０を、ヤットコ７の一部に形成したが、ヤットコ７の全長に中空状の錘収容部２０を構成してもよい。 (2) In the above-described embodiment, the hollow weight accommodating portion 20 for accommodating the weight material 26 as the weight 6 is formed in a part of the yatco 7, but the hollow weight accommodating portion 20 is formed over the entire length of the yatco 7. May be configured.

（３）上述の実施形態では、構真柱１として閉断面の角型の鋼管柱を例にあげて説明したが、Ｈ形鋼やクロスＨ鋼等の開断面の鉄骨柱を用いて実施してもよい。 (3) In the above-described embodiment, a square steel pipe column having a closed cross section has been described as an example of the structural column 1, but this is carried out using a steel column having an open cross section such as H-shaped steel or cross-H steel. You may.

（４）上述の実施形態では、ヤットコ７の本体をクロスＨ鋼１１から構成したが、ヤットコ７の本体をＨ形鋼や鋼管等から構成してもよい。 (4) In the above-described embodiment, the main body of the Yatco 7 is made of cloth H steel 11, but the main body of the Yatco 7 may be made of H-shaped steel, a steel pipe, or the like.

１ 構真柱（鋼管柱）
２ 地盤
３ 孔（建込み用孔）
５ コンクリート
６ 錘
７ ヤットコ（錘付きヤットコ）
１１ クロスＨ鋼
１１Ａ ウェブ
１１Ｂ フランジ
２０ 錘収容部
２１ 側板部
２５ 内部空間
２６ 重量材 1 Structure Shinbashira (steel pipe pillar)
2 Ground 3 Holes (holes for building)
5 Concrete 6 Weight 7 Yatko (Yatko with weight)
11 Cross H steel 11A Web 11B Flange 20 Weight accommodating part 21 Side plate part 25 Internal space 26 Heavy material

Claims (3)

地盤に形成した孔内にコンクリートを打設した後、ヤットコに錘を付加した錘付きヤットコを用いて前記孔内に構真柱を落とし込むことにより、前記構真柱を建て込む構真柱施工方法において、
前記錘付きヤットコが、前記ヤットコの少なくとも一部に形成した中空状の錘収容部内に、前記錘としての重量材を収容して構成される構真柱施工方法。 A method of constructing a structural pillar by placing concrete in a hole formed in the ground and then dropping the structural pillar into the hole using a weighted yatko with a weight added to the yatko. In
A structural pillar construction method in which a weighted yatko is configured by accommodating a heavy material as the weight in a hollow weight accommodating portion formed in at least a part of the weight . 前記錘収容部が、クロスＨ鋼の隣り合うウェブの内面とこれに連続する隣り合うフランジの内面とで囲まれた内部空間を封鎖して構成される請求項１記載の構真柱施工方法。 The structural pillar construction method according to claim 1 , wherein the weight accommodating portion seals an internal space surrounded by an inner surface of adjacent webs of cross-H steel and an inner surface of adjacent flanges continuous thereto. 前記構真柱が下端を閉塞した鋼管柱である請求項１又は２記載の構真柱施工方法。 The method for constructing a structural pillar according to claim 1 or 2 , wherein the structural pillar is a steel pipe pillar in which the lower end is closed.
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JP3631552B2 (en) * 1996-01-26 2005-03-23 株式会社竹中工務店 Upper centering device for guide pipe for construction of true pillar
JPH10131186A (en) * 1996-10-30 1998-05-19 Taisei Corp Prevention method for incursion of earth and sand into cross h-shape structural center column

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Publication number Priority date Publication date Assignee Title
JP2002038501A (en) 2000-07-21 2002-02-06 Taisei Corp Pipe material for inverted construction structural column
JP2004162370A (en) 2002-11-13 2004-06-10 Takenaka Komuten Co Ltd Steel pipe structural permanent column erection method
US20060233617A1 (en) 2003-03-14 2006-10-19 Cementation Foundation Skanska Limited Placing elements in piles
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