JP2023168032A - Bottom enlarged bucket and bottom enlarged hole construction method - Google Patents

Bottom enlarged bucket and bottom enlarged hole construction method Download PDF

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JP2023168032A
JP2023168032A JP2022079644A JP2022079644A JP2023168032A JP 2023168032 A JP2023168032 A JP 2023168032A JP 2022079644 A JP2022079644 A JP 2022079644A JP 2022079644 A JP2022079644 A JP 2022079644A JP 2023168032 A JP2023168032 A JP 2023168032A
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bucket
expanded
hole
bottom enlarged
blade
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明宏 大塚
Akihiro Otsuka
隆 福島
Takashi Fukushima
匡太 村松
Masahiro Muramatsu
幸次郎 武居
Kojiro Takei
利行 落合
Toshiyuki Ochiai
森田　亨
Toru Morita
正毅 山田
Masaki Yamada
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Kajima Corp
Nippon Sharyo Ltd
Toyo Techno Corp
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Kajima Corp
Nippon Sharyo Ltd
Toyo Techno Corp
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Priority to JP2022079644A priority Critical patent/JP2023168032A/en
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Abstract

To provide a large-sized bottom enlarged bucket and a bottom enlarged hole construction method, which can reduce weight of the bottom enlarged bucket and suppress increase of excavation resistance.SOLUTION: A first bucket body 22 has a first bottom enlarged bucket 21, which has an upper bottom enlarged blade 24 to construct an upper side of a bottom enlarged hole 42. A second bucket body 32 has a second bottom enlarged bucket 31, which has a lower bottom enlarged blade 34 to construct a lower side of the bottom enlarged hole 42. The first bottom enlarged bucket 21 and the second bottom enlarged bucket 31 are replaceably fitted to a tip of a kelly-bar.SELECTED DRAWING: Figure 1

Description

本発明は、アースドリルにより掘削した縦孔の底部を拡大掘削して、拡底孔を形成する拡底バケット及び拡底孔の施工方法に関する。 The present invention relates to a bottom-expanded bucket and a method for constructing a bottom-expanded hole, in which the bottom of a vertical hole drilled with an earth drill is enlarged to form the bottom-expanded hole.

従来、アースドリルによって、拡底孔を掘削する際には、まず、ケリーバの先端に掘削バケットを装着して、所定深さの縦孔を掘削した後、掘削バケットを拡底バケットに交換して、縦孔の底部をテーパー状（円錐状）に拡底している。この拡底バケットは、バケット本体の外周に、油圧シリンダの作動によって開閉する掘削刃を備えた拡底翼を備え、ベースマシンから油圧シリンダに供給される油圧により、油圧シリンダが伸縮して拡底翼が開閉するように形成されている。高層ビルや高層タワー等の基礎杭では、基礎杭に高い支持力が要求されることから、拡底孔を大径に掘削して基礎杭の拡底径を大きくすることが求められている。しかし、大径の拡底孔を掘削するためには、拡底翼の寸法を大きくしなければならないことから、掘削抵抗が増大し、さらに、拡底バケットの重量も増加することから、一度に排土できる土砂の量が減少していた。 Conventionally, when drilling a bottom-expanding hole with an earth drill, first, a drilling bucket is attached to the tip of the Kerry bar, and after drilling a vertical hole of a predetermined depth, the excavation bucket is replaced with a bottom-expanding bucket, and the vertical hole is drilled. The bottom of the hole is widened into a tapered (conical) shape. This expanded-bottom bucket is equipped with an expanded-bottom wing equipped with a digging blade on the outer periphery of the bucket body, which is opened and closed by the operation of a hydraulic cylinder.The hydraulic cylinder is expanded and contracted by the hydraulic pressure supplied from the base machine to the hydraulic cylinder, and the expanded-bottom blade opens and closes. It is formed to do so. In the case of foundation piles for high-rise buildings, high-rise towers, etc., since the foundation pile is required to have a high bearing capacity, it is required to increase the expansion diameter of the foundation pile by drilling a large diameter expansion hole. However, in order to excavate a large-diameter expanded hole, the dimensions of the expanded blade must be increased, which increases the digging resistance and also increases the weight of the expanded bucket, making it difficult to remove soil at once. The amount of sediment was decreasing.

このため、拡底バケットの拡底翼を上下２段に分割し、下段の拡底翼を駆動拡底翼、上段の拡底翼を従動拡底翼とし、両者間に連動用動力伝達手段を設け、下段の拡底翼がある程度開いてから上段の拡底翼が開くように形成し、拡底翼を閉じる際に、バケット本体を大型化させなくても、拡底翼を良好に閉じることができるようにしたものがあった（例えば、特許文献１参照。）。 For this purpose, the expansion blades of the expansion bucket are divided into upper and lower stages, the lower expansion blades are the driving expansion blades, the upper expansion blades are the driven expansion blades, interlocking power transmission means is provided between the two, and the lower expansion blades are the driven expansion blades. There was one that was formed so that the upper expanded bottom blades opened after the bucket had opened to a certain extent, and when closing the expanded bottom blades, the expanded bottom blades could be closed well without increasing the size of the bucket body ( For example, see Patent Document 1).

特開２０００－２１３２７０号公報Japanese Patent Application Publication No. 2000-213270

しかし、上述の特許文献１のものは、拡底翼を上下２段に分割することで、バケット本体が大型化して重量が増大することをある程度は抑制できるものの、その効果が限定的であり、また、掘削抵抗が増大することは抑制できなかった。 However, in the above-mentioned patent document 1, although it is possible to suppress the bucket body from increasing in size and weight to some extent by dividing the expanded bottom blade into upper and lower stages, the effect is limited, and , the increase in excavation resistance could not be suppressed.

そこで本発明は、拡底バケットの軽量化を図るとともに、掘削抵抗が増大することを抑制できる大型の拡底バケット及び拡底孔の施工方法を提供することを目的としている。 SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a large-sized expanded-bottom bucket and a method for constructing an expanded-bottom hole, which can reduce the weight of the expanded-bottom bucket and suppress an increase in excavation resistance.

上記目的を達成するため、本発明の拡底バケットは、アースドリルのケリーバ先端に着脱可能に装着され、予め掘削した縦孔の底部を、バケット本体に開閉可能に設けられた拡底翼を開くことにより拡大掘削し、拡底孔を形成する拡底バケットにおいて、前記拡底翼は、前記拡底孔の上部側を施工する上部拡底翼と、前記拡底孔の下部側を施工する下部拡底翼とに分割して形成され、前記拡底バケットは、前記ケリーバ先端に付け替え可能に装着される第１拡底バケットと第２拡底バケットとを備え、前記第１拡底バケットは、第１バケット本体に、前記上部拡底翼のみを備え、前記第２拡底バケットは、第２バケット本体に、前記下部拡底翼のみを備えることを特徴としている。 In order to achieve the above object, the expanded bottom bucket of the present invention is removably attached to the tip of an earth drill. In the bottom-expanding bucket in which a bottom-expanding hole is formed by enlarging excavation, the bottom-expanding wing is formed by being divided into an upper bottom-expanding wing for constructing the upper side of the bottom-expanding hole, and a lower bottom-expanding wing for constructing the lower side of the bottom-expanding hole. The expanded-bottom bucket includes a first expanded-bottom bucket and a second expanded-bottom bucket that are replaceably attached to the tip of the Kelly bar, and the first expanded bucket includes only the upper expanded-bottom wing on the first bucket body. , the second expanded-bottom bucket is characterized in that the second bucket body includes only the lower expanded-bottom blade.

また、本発明の拡底孔の施工方法は、請求項１に記載の拡底バケットを用いて拡底孔を施工する拡底孔の施工方法において、前記第１拡底バケットを前記ケリーバ先端に装着し、拡底孔の上部側を施工した後、前記第１拡底バケットを吊り上げ、地上で前記ケリーバ先端から、前記第１拡底バケットを取外して前記第２拡底バケットに付け替えた後、前記拡底孔の下部側を施工することを特徴としている。 Further, the method for constructing an enlarged bottom hole of the present invention is a method for constructing an enlarged bottom hole using the enlarged bottom bucket according to claim 1, in which the first enlarged bottom bucket is attached to the tip of the Kelly bar, and After constructing the upper side of the expanded bottom hole, lift the first expanded bottom bucket, remove the first expanded bottom bucket from the tip of the Kelly bar on the ground, replace it with the second expanded bottom bucket, and then construct the lower side of the expanded bottom hole. It is characterized by

本発明の拡底バケット及び拡底孔の施工方法によれば、第１拡底バケットと第２拡底バケットとから成る２種類の拡底バケットで掘削段階毎に順を追って、ケリーバ先端に付け替えて機能させることから、拡底バケットに生じる掘削抵抗を極力抑えながら、拡底孔を施工することができる。さらに、第１拡底バケットと第２拡底バケットとは、上部拡底翼と下部拡底翼のいずれか一方しか備えていないことから拡底バケットの軽量化を図ることができ、一度に排土できる土砂の量を増大させて排土作業の回数を減少させ、効率を向上させることができる。 According to the method for constructing a bottom-expanding bucket and a bottom-expanding hole of the present invention, two types of bottom-expanding buckets consisting of a first bottom-expanding bucket and a second bottom-expanding bucket are sequentially attached to the Kerry bar tip at each excavation stage to function. , it is possible to construct a bottom-expanded hole while minimizing the excavation resistance generated in the bottom-expanded bucket. Furthermore, since the first expanded bottom bucket and the second expanded bottom bucket are equipped with only one of the upper expanded bottom blade and the lower expanded bottom blade, the weight of the expanded bottom bucket can be reduced, and the amount of earth and sand that can be removed at one time is reduced. It is possible to increase efficiency by reducing the number of soil removal operations.

また、上下で掘削を分ける（拡底翼の上部のみ・下部のみで掘削を分ける）ことができるため、上下一体で掘削するよりも、掘削抵抗が極力抑えられる。さらに、拡底バケット重量と土砂重量の総重量は、掘削機の能力によって決まっていることから、上部のみ下部のみの拡大翼にして、各々の拡底バケットの重量増加を抑えたことで、拡底バケットに一度に収納できる土砂を増やすことができる。すなわち、一度に排土できる土砂の量を増大させることが可能となる。 In addition, since excavation can be divided between the upper and lower parts (excavation is divided only between the upper and lower parts of the expanded bottom wing), excavation resistance can be minimized compared to excavating at the upper and lower parts as one unit. Furthermore, since the total weight of the expanded bottom bucket and soil weight is determined by the capacity of the excavator, by using only the upper and lower expanding wings, we have suppressed the weight increase of each expanded bucket. You can increase the amount of soil that can be stored at one time. That is, it becomes possible to increase the amount of earth and sand that can be removed at one time.

第１拡底バケットの正面図である。FIG. 3 is a front view of the first expanded-bottom bucket. 第１拡底バケットにて拡底孔の上部側を施工した説明図である。FIG. 3 is an explanatory diagram of the upper side of the bottom-expanded hole constructed using the first bottom-expanded bucket. 第２拡底バケットの正面図である。FIG. 6 is a front view of the second expanded bottom bucket. 第２拡底バケットにて拡底孔の下部側を施工した状態の説明図である。It is an explanatory view of the state where the lower part side of the bottom expansion hole was constructed with the second bottom expansion bucket. 拡底バケットを連結した状態のアースドリルの側面図である。FIG. 3 is a side view of the earth drill with the expanded bottom bucket connected.

図１乃至図５は本発明の拡底バケットの一形態例を示す図で、拡底バケット２１（３１）を連結するアースドリル１１は、図５に示すように、自走式のベースマシン１２と、ブーム１３と、支持アーム１４と、支持アーム１４に支持されるケリーバ駆動装置１５と、ケリーバ駆動装置１５により回転駆動するケリーバ１６と、ケリーバ駆動装置１５の下部に設けられ、昇降を規制した状態でケリーバ１６と一体に回転する回転テーブル１７とを備え、回転テーブル１７から下方に突出したケリーバ１６の下端部に拡底バケットが着脱可能に装着される。ケリーバ１６は、ベースマシン１２に設けられたウインチ（図示せず）に巻回されるワイヤロープ１８に連結され、ウインチによってワイヤロープ１８が巻き取り、もしくは、巻き出しされることにより上下方向に移動自在となっており、拡底バケット２１（３１）は、ケリーバ１６と一体に回転するとともに上下動する。 1 to 5 are diagrams showing one embodiment of the expanded bottom bucket of the present invention, and the earth drill 11 connecting the expanded bottom bucket 21 (31) is connected to a self-propelled base machine 12, as shown in FIG. The boom 13, the support arm 14, the Kelly bar drive device 15 supported by the support arm 14, the Kelly bar 16 that is rotatably driven by the Kelly bar drive device 15, and the Kelly bar drive device 16, which is provided at the lower part of the Kelly bar drive device 15, and whose vertical movement is regulated. It is provided with a rotary table 17 that rotates integrally with the Kelly bar 16, and an expanded bottom bucket is removably attached to the lower end of the Kelly bar 16 that projects downward from the rotating table 17. The kelly bar 16 is connected to a wire rope 18 that is wound around a winch (not shown) provided on the base machine 12, and is moved in the vertical direction as the wire rope 18 is wound up or unwound by the winch. The expanded bottom bucket 21 (31) rotates together with the Kelly bar 16 and moves up and down.

拡底バケットは、ケリーバ１６の先端に付け替え可能に設けられた第１拡底バケット２１と第２拡底バケット３１とを備えている。図１に示すように、第１拡底バケット２１は、円筒状の第１バケット本体２２と、第１バケット本体２２の上端部に設けたスタビライザー２３と、第１バケット本体２２の下端部に設けた底蓋２２ａと、開口部を開閉し、開状態で下方に向けて漸次大径となる円錐状の上部拡底翼２４，２４と、上部拡底翼２４，２４を開閉させる拡底翼駆動装置（図示せず）とを備えている。 The expanded-bottom bucket includes a first expanded-bottom bucket 21 and a second expanded-bottom bucket 31 that are replaceably provided at the tip of the Kelly bar 16. As shown in FIG. 1, the first expanded-bottom bucket 21 includes a cylindrical first bucket main body 22, a stabilizer 23 provided at the upper end of the first bucket main body 22, and a stabilizer 23 provided at the lower end of the first bucket main body 22. The bottom lid 22a, the conical upper expanded bottom blades 24, 24 that open and close the opening and gradually increase in diameter downward in the open state, and the expanded bottom blade drive device (not shown) that opens and closes the upper expanded bottom blades 24, 24. ).

上部拡底翼２４は、一側縁（回動基部）が第１バケット本体２２の縦枠２２ｂ，２２ｂに複数のヒンジ部材２５を回動軸として回動可能にそれぞれ取り付けられ、他側縁（回動端部）には、複数の掘削刃２６が連続して設けられている。
れている。 The upper bottom expansion wing 24 has one side edge (rotation base) attached to the vertical frames 22b, 22b of the first bucket main body 22 so as to be rotatable about a plurality of hinge members 25, and the other side edge (rotation base). A plurality of excavation blades 26 are successively provided on the movable end portion).
It is.

図３に示すように、第２拡底バケット３１は、円筒状の第２バケット本体３２と、第２バケット本体３２の上端部に設けたスタビライザー３３と、第２バケット本体３２の下端部に設けた底蓋３２ａと、開口部を開閉し、開状態で下方に向けて漸次大径となる円錐台状の下部拡底翼３４，３４と、下部拡底翼３４，３４を開閉させる拡底翼駆動装置（図示せず）とを備えている。 As shown in FIG. 3, the second expanded-bottom bucket 31 includes a cylindrical second bucket main body 32, a stabilizer 33 provided at the upper end of the second bucket main body 32, and a stabilizer 33 provided at the lower end of the second bucket main body 32. The bottom cover 32a, the truncated cone-shaped lower bottom expansion blades 34, 34 that open and close the opening and gradually increase in diameter toward the bottom in the open state, and the bottom expansion blade drive device that opens and closes the bottom expansion blades 34, 34 (Fig. (not shown).

下部拡底翼３４は、一側縁（回動基部）が第２バケット本体３２の縦枠３２ｂ，３２ｂに複数のヒンジ部材３５を回動軸として回動可能にそれぞれ取り付けられ、他側縁（回動端部）には、複数の掘削刃３６が連続して設けられている。尚、第１拡底バケット２１と第２拡底バケット３１の本体２２，３２（スタビライザー２３，３３と底蓋２２ａ，３２ａとの間隔）は略同一であって施工する拡底孔４２の高さに概ね等しく、第１拡底バケット２１の上部拡底翼２４は本体２２の上端部に設けられ、第２拡底バケット３１の下部拡底翼３４は本体３２の下端部に設けられている。 The bottom expanded wing 34 has one side edge (rotation base) attached to the vertical frames 32b, 32b of the second bucket body 32 so as to be rotatable about a plurality of hinge members 35, and the other side edge (rotation base). A plurality of excavation blades 36 are continuously provided on the movable end portion). The main bodies 22, 32 (the distance between the stabilizers 23, 33 and the bottom covers 22a, 32a) of the first expanded bottom bucket 21 and the second expanded bottom bucket 31 are approximately the same, and are approximately equal to the height of the expanded bottom hole 42 to be constructed. The upper expansion wing 24 of the first expansion bucket 21 is provided at the upper end of the main body 22, and the lower expansion wing 34 of the second expansion bucket 31 is provided at the lower end of the main body 32.

上部拡底翼２４と下部拡底翼３４とは、一体に形成されていた従来の拡底翼を上下２段に分離分割して形成したもので、第１拡底バケット２１に備わる上部拡底翼２４では、拡底孔４２の上部４２ａ側のみを、第２拡底バケット３１に備わる下部拡底翼３４では、拡底孔４２の下部４２ｂ側のみをそれぞれ施工する。 The upper expansion blade 24 and the lower expansion blade 34 are formed by separating and dividing the conventional expansion blade, which was formed integrally, into upper and lower stages. Only the upper part 42a side of the hole 42 is constructed, and the lower bottom expansion wing 34 provided in the second expanded bottom bucket 31 is constructed only on the lower part 42b side of the bottom expansion hole 42.

上述のように形成されたアースドリル１１を用いて拡底孔を施工する際は、まず、図１及び図２に示されるように、ケリーバ１６の先端に第１拡底バケット２１を連結し、該第１拡底バケット２１を、掘削バケット（図示せず）で予め掘削した縦孔４１に挿入し、該縦孔４１の底部において回転駆動した状態で、上部拡底翼２４を徐々に開きながら、拡底孔４２の上部４２ａ側をテーパー状に拡径させる（図２の斜線で示した部分）。また、掘削した土砂は上部拡底翼２４の内面に沿って第１バケット本体２２側に導入され、第１バケット本体２２内に取り込まれる。所定量を掘削した後は、上部拡底翼２４を閉じて、土砂を第１バケット本体２２内に抱え込ませる。そして、第１拡底バケット２１を土砂ごと吊り上げ、所定の場所で底蓋２２ａを開いて排土する。これを数回繰り返し、拡底孔４２の上部４２ａ側が施工される。 When drilling a bottom-expanded hole using the earth drill 11 formed as described above, first, as shown in FIGS. 1 and 2, connect the first bottom-expanded bucket 21 to the tip of the Kelly bar 16, and 1. The bottom-expanding bucket 21 is inserted into the vertical hole 41 previously excavated with an excavation bucket (not shown), and while being rotated at the bottom of the vertical hole 41, the bottom-expanding bucket 21 is gradually opened while the bottom-expanding blade 24 is gradually opened. The diameter of the upper portion 42a is expanded in a tapered manner (the shaded portion in FIG. 2). Further, the excavated earth and sand is introduced into the first bucket body 22 side along the inner surface of the upper expanded bottom wing 24 and taken into the first bucket body 22. After excavating a predetermined amount, the upper expansion wing 24 is closed to hold the earth and sand into the first bucket body 22. Then, the first expanded-bottom bucket 21 is lifted up together with the soil, and the bottom cover 22a is opened at a predetermined location to discharge the soil. This is repeated several times, and the upper part 42a side of the enlarged bottom hole 42 is completed.

拡底孔４２の下部４２ｂ側を施工する際は、図３及び図４に示されるように、地上において第１拡底バケット２１と第２拡底バケット３１とを付け替える。その後、既に施工済みの拡底孔４２の上部４２ａ側まで第２拡底バケット３１を挿入し、下部拡底翼３４を徐々に開きながら、最大拡底径となる拡底孔４２の下部４２ｂ側を施工する（図４の斜線で示した部分）。また、掘削した土砂は下部拡底翼３４の内面に沿って第２バケット本体３２側に導入され、第２バケット本体３２内に取り込まれる。所定量を掘削した後は、下部拡底翼３４を閉じて、土砂を第２バケット本体３２内に抱え込ませた状態で第２拡底バケット３１を吊り上げ、底蓋３２ａを開いて排土する。これを数回繰り返し、拡底孔４２の下部４２ｂ側が施工される。 When constructing the lower part 42b side of the expanded bottom hole 42, as shown in FIGS. 3 and 4, the first expanded bottom bucket 21 and the second expanded bottom bucket 31 are replaced on the ground. After that, the second bottom expansion bucket 31 is inserted to the upper part 42a side of the expanded bottom hole 42 that has already been constructed, and while gradually opening the lower bottom expansion blade 34, construction is performed on the lower part 42b side of the bottom expansion hole 42, which has the maximum expansion diameter (Fig. 4). Further, the excavated earth and sand is introduced into the second bucket body 32 side along the inner surface of the lower bottom expansion wing 34 and taken into the second bucket body 32. After excavating a predetermined amount, the lower bottom expansion blade 34 is closed, the second bottom expansion bucket 31 is lifted up with the earth and sand held in the second bucket body 32, and the bottom cover 32a is opened to discharge the soil. This process is repeated several times, and the lower part 42b side of the enlarged bottom hole 42 is completed.

このように、本発明によれば、第１拡底バケット２１と第２拡底バケット３１とから成る２種類の拡底バケットを掘削段階毎に順を追って、ケリーバ先端に付け替えて機能させることから、拡底バケットに生じる掘削抵抗を極力抑えながら、拡底孔４２を施工することができる。さらに、第１拡底バケット２１と第２拡底バケット３１とは、上部拡底翼２４と下部拡底翼３４のいずれか一方しか備えていないことから拡底バケットの軽量化を図ることができ、一度に排土できる土砂の量を増大させて排土作業の回数を減少させ、効率を向上させることができる。 As described above, according to the present invention, the two types of bottom-expanding buckets consisting of the first bottom-expanding bucket 21 and the second bottom-expanding bucket 31 are sequentially replaced with the Kelly bar tip at each excavation stage to function. The enlarged bottom hole 42 can be constructed while minimizing the excavation resistance generated in the hole. Furthermore, since the first expanded-bottom bucket 21 and the second expanded-bottom bucket 31 are only equipped with either the upper expanded-bottom blade 24 or the lower expanded-bottom blade 34, the weight of the expanded-bottom bucket can be reduced, and soil can be removed at one time. It is possible to increase the amount of soil produced, reduce the number of soil removal operations, and improve efficiency.

また、上下で掘削を分ける（上部拡底翼２４のみ・下部拡底翼３４のみで掘削を分ける）ことができるため、上下一体で掘削するよりも、掘削抵抗が極力抑えられる。さらに、拡底バケット重量と土砂重量の総重量は、掘削機の能力によって決まっていることから、上部のみ下部のみの拡大翼にして、各々の拡底バケット２１，３１の重量増加を抑えたことで、拡底バケットに一度に収納できる土砂を増やすことができる。すなわち、一度に排土できる土砂の量を増大させることが可能となる。 Further, since excavation can be divided between the upper and lower parts (excavation can be divided between only the upper and lower bottom expansion blades 24 and 34), excavation resistance can be suppressed as much as possible compared to excavation in the upper and lower parts as one unit. Furthermore, since the total weight of the expanded bottom bucket and soil weight is determined by the capacity of the excavator, by using only the upper and lower expanded wings, we suppressed the increase in weight of each of the expanded bottom buckets 21 and 31. It is possible to increase the amount of soil that can be stored in the expanded bottom bucket at one time. That is, it becomes possible to increase the amount of earth and sand that can be removed at one time.

なお、本発明は上述の形態例に限るものではなく、上下に分離分割した拡底翼同士の寸法関係は、拡底バケットの仕様に基づいて適宜変更することができる。 Note that the present invention is not limited to the above-described embodiment, and the dimensional relationship between the upper and lower expanded-bottom blades can be changed as appropriate based on the specifications of the expanded-bottom bucket.

１１…アースドリル、１２…ベースマシン、１３…ブーム、１４…支持アーム、１５…ケリーバ駆動装置、１６…ケリーバ、１７…回転テーブル、１８…ワイヤロープ、２１…第１拡底バケット、２２…第１バケット本体、２２ａ…底蓋、２２ｂ縦枠、２３…スタビライザー、２４…上部拡底翼、２５…ヒンジ部材、２６…掘削刃、３１…第２拡底バケット、３２…第２バケット本体、３２ａ…底蓋、３２ｂ…縦枠、３３…スタビライザー、３４…下部拡底翼、３５…ヒンジ部材、３６…掘削刃、４１…縦孔、４２…拡底孔、４２ａ…上部、４２ｂ…下部 DESCRIPTION OF SYMBOLS 11... Earth drill, 12... Base machine, 13... Boom, 14... Support arm, 15... Kellyba drive device, 16... Kellyba, 17... Rotary table, 18... Wire rope, 21... First expanded bottom bucket, 22... First Bucket body, 22a...bottom lid, 22b vertical frame, 23...stabilizer, 24...upper bottom expansion wing, 25...hinge member, 26...excavation blade, 31...second bottom expansion bucket, 32...second bucket body, 32a...bottom lid , 32b... Vertical frame, 33... Stabilizer, 34... Lower bottom expansion wing, 35... Hinge member, 36... Excavation blade, 41... Vertical hole, 42... Bottom expansion hole, 42a... Upper part, 42b... Lower part.

Claims (2)

アースドリルのケリーバ先端に着脱可能に装着され、予め掘削した縦孔の底部を、バケット本体に開閉可能に設けられた拡底翼を開くことにより拡大掘削し、拡底孔を形成する拡底バケットにおいて、
前記拡底翼は、前記拡底孔の上部側を施工する上部拡底翼と、前記拡底孔の下部側を施工する下部拡底翼とに分割して形成され、
前記拡底バケットは、前記ケリーバ先端に付け替え可能に装着される第１拡底バケットと第２拡底バケットとを備え、前記第１拡底バケットは、第１バケット本体に、前記上部拡底翼のみを備え、前記第２拡底バケットは、第２バケット本体に、前記下部拡底翼のみを備えることを特徴とする拡底バケット。 In an expanded bottom bucket that is detachably attached to the tip of an earth drill, the bottom of a pre-drilled vertical hole is enlarged and excavated by opening the expanded bottom wing provided in the bucket body so as to be openable and closable, thereby forming an expanded bottom hole.
The expanded bottom blade is formed by being divided into an upper expanded bottom blade that is constructed on the upper side of the expanded bottom hole, and a lower expanded bottom blade that is constructed on the lower side of the expanded bottom hole,
The expanded-bottom bucket includes a first expanded-bottom bucket and a second expanded-bottom bucket that are replaceably attached to the tip of the Kelly bar, and the first expanded bucket includes only the upper expanded-bottom wing on the first bucket body, and The second expanded-bottom bucket is characterized in that the second bucket main body is provided with only the lower expanded-bottom blade. 請求項１に記載の拡底バケットを用いて拡底孔を施工する拡底孔の施工方法において、前記第１拡底バケットを前記ケリーバ先端に装着し、拡底孔の上部側を施工した後、前記第１拡底バケットを吊り上げ、地上で前記ケリーバ先端から、前記第１拡底バケットを取外して前記第２拡底バケットに付け替えた後、前記拡底孔の下部側を施工することを特徴とする拡底孔の施工方法。 2. The method for constructing a bottom-expanded hole using the bottom-expanding bucket according to claim 1, wherein the first bottom-expanding bucket is attached to the tip of the Kelly bar, and after the upper side of the bottom-expanding hole is constructed, the first bottom-expanding bucket is A method for constructing an expanded bottom hole, comprising lifting a bucket, removing the first expanded bottom bucket from the tip of the Kelly bar on the ground, and replacing it with the second expanded bottom bucket, and then constructing the lower side of the expanded bottom hole.
JP2022079644A 2022-05-13 2022-05-13 Bottom enlarged bucket and bottom enlarged hole construction method Pending JP2023168032A (en)

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