JP5170331B2 - Protective jig for construction of steel pipe with inner joint pipe and construction method of steel pipe - Google Patents

Protective jig for construction of steel pipe with inner joint pipe and construction method of steel pipe Download PDF

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JP5170331B2
JP5170331B2 JP2012022611A JP2012022611A JP5170331B2 JP 5170331 B2 JP5170331 B2 JP 5170331B2 JP 2012022611 A JP2012022611 A JP 2012022611A JP 2012022611 A JP2012022611 A JP 2012022611A JP 5170331 B2 JP5170331 B2 JP 5170331B2
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joint pipe
steel pipe
inner joint
pipe
construction
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JP2012132306A (en
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久和 田近
公寿 高野
玄 森
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JFE Steel Corp
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本発明は、鋼管（特に杭用途）における管軸方向の継手構造に用いる施工用保護治具、およびその保護治具を用いて鋼管を地中に埋設する施工方法に関する。   TECHNICAL FIELD The present invention relates to a construction protection jig used for a joint structure in a pipe axis direction in a steel pipe (particularly for piles), and a construction method for embedding a steel pipe in the ground using the protection jig.

鋼管や、PHC、PRCもしくはSCに代表される鋼管コンクリート管は、従来、施工現場において、溶接やネジ等の機械的な継手構造によって接合されているが、これらの作業には熟練した作業者を要する為、施工期間や人件費の点でコストがかかる。   Steel pipes and steel pipe concrete pipes represented by PHC, PRC or SC are conventionally joined at the construction site by mechanical joint structures such as welding and screws. Therefore, it costs in terms of construction period and labor cost.

そこで、例えば、特許文献１には、第１鋼管（杭）の端部に係合部材を延設すると共に、第２鋼管（杭）の端部に被係合部材を延設し、係合部材と被係合部材とが当接して相対的に変形して第１鋼管（杭）と第２鋼管（杭）とが接続される鋼管（杭）の継手構造の技術が開示されている。また、特許文献２には、鋼管の接合端部に設けられた外側継手管と内側継手管とを、管軸方向に差し込むことにより鋼管を接続する鋼管継手構造において、外側継手管又は内側継手管の何れか一方に形成された複数の分割片と、圧縮荷重に対して抵抗する当接部と、内側継手管の外周面に形成された凸部と、当該凸部と係合して引張荷重に対し抵抗する外側継手管の内周面に形成された係合部とを設けた技術が開示されている。   Therefore, for example, in Patent Document 1, an engaging member is extended to the end portion of the first steel pipe (pile), and an engaged member is extended to the end portion of the second steel pipe (pile). A technique of a joint structure of a steel pipe (pile) in which a member and an engaged member are brought into contact with each other and relatively deformed to connect the first steel pipe (pile) and the second steel pipe (pile) is disclosed. Patent Document 2 discloses a steel pipe joint structure in which a steel pipe is connected by inserting an outer joint pipe and an inner joint pipe provided at a joint end of the steel pipe in the pipe axis direction, and the outer joint pipe or the inner joint pipe. A plurality of divided pieces formed on any one of the above, a contact portion that resists compression load, a convex portion formed on the outer peripheral surface of the inner joint pipe, and a tensile load that engages with the convex portion And an engaging portion formed on the inner peripheral surface of the outer joint pipe that resists the above.

これらの継手構造は、熟練した作業者が必要無い上に、継手部分の加工コストも大きくなり難い為、非常に有効な技術である。このように、対になった継手同士を差し込むことで接続する機械式継手を、本明細書では、差込式継手、差込式継手管もしくは差込式継手構造と呼ぶ。   These joint structures are very effective techniques because they do not require skilled workers and are difficult to increase the processing cost of the joint parts. In this specification, a mechanical joint that is connected by inserting a pair of joints together is referred to as a plug-in joint, a plug-in joint pipe, or a plug-in joint structure.

しかし、特許文献１や特許文献２に開示された差込式継手構造は、この継手が取り付けられた鋼管を地中に埋設する際、特に、打撃工法や振動工法による施工時に、鋼管上端部（即ち継手そのもの）に掛ける打撃力により変形するおそれがある。   However, the plug-in joint structure disclosed in Patent Document 1 and Patent Document 2 has a steel pipe upper end (when embedding a steel pipe to which this joint is attached in the ground, particularly during construction using a striking method or a vibration method. That is, there is a risk of deformation due to the striking force applied to the joint itself.

図１４に、特許文献１に開示された差込式継手における、係合部材の変形例を模式的に断面図で示した。鋼管１１１に延設された係合部材１１２は、円周上に複数個にスリットで分割された分割片１１２ａ、１１２ｂ、１１２ｃ、１１２ｄからなり、その根元には鋼管１１１の内側方向に突出した当接部材１１３が設けられている。ここで、鋼管１１１を地中に埋設するのに係合部材１１２の上端部を打撃すると、全ての係合部材１１２が内側に倒れたり（図１４（ａ）参照）、外側に倒れたり（図１４（ｂ）参照）、もしくは係合部材１１２のそれぞれが別々の側に倒れたりして、係合部材１１２が変形もしくは座屈してしまう。   In FIG. 14, the modification of the engaging member in the plug-in type joint disclosed in Patent Document 1 is schematically shown in a cross-sectional view. The engaging member 112 extended to the steel pipe 111 is composed of divided pieces 112a, 112b, 112c, and 112d that are divided into a plurality of slits on the circumference, and the base of the engaging member 112 protrudes inward of the steel pipe 111. A contact member 113 is provided. Here, when the upper end portion of the engaging member 112 is struck to embed the steel pipe 111 in the ground, all the engaging members 112 may fall inward (see FIG. 14A) or fall outward (see FIG. 14). 14 (b)), or each of the engaging members 112 falls to different sides, and the engaging member 112 is deformed or buckled.

そこで発明者等は、差込式継手管を備えた鋼管に対して、打撃工法や振動工法による施工が可能となる施工用保護治具を開発した。この施工用保護治具は特許文献３にて開示されており、打撃力が付与される上端部と、継手管の段部から上端までの高さ越えの高さの筒体と、継手管の段部に当接する下端部と、継手管の複数の分割片を固定する手段とを備えたことを特徴とし、施工時に、継手管に被せて使用する。   Thus, the inventors have developed a protective jig for construction that enables construction by a hammering method or a vibration method to a steel pipe having a plug-in joint pipe. This construction protection jig is disclosed in Patent Document 3, and includes an upper end portion to which a striking force is applied, a cylindrical body having a height exceeding the height from the stepped portion to the upper end of the joint tube, and a joint tube It is provided with a lower end portion that comes into contact with the stepped portion and means for fixing a plurality of divided pieces of the joint pipe, and is used by covering the joint pipe at the time of construction.

特開２００３−００３４６３号公報JP 2003-003463 A 特開２００４−０３６３２９号公報JP 2004-036329 A 特開２００５−２４８６６５号公報JP 2005-248665 A

しかしながら、特許文献３の場合、継手管の分割片を施工用保護治具で固定するのに継手管のネジ孔もしくは貫通孔を利用することから、当該ネジ孔もしくは貫通孔を破損する可能性があるという問題点があった。特に、振動工法において施工用保護治具と継手管との間で引張力を伝達する場合、この引張力の伝達箇所は、継手管の分割片と施工用保護治具とを固定しているボルトの軸、ならびに、継手管のネジ孔もしくは貫通孔である為、継手管のネジ孔もしくは貫通孔が破損する可能性がある。特に、鋼管を埋設したい場所が非常に固い場合には、継手管のネジ孔もしくは貫通孔が破損する可能性は、さらに高くなる。よって、埋設に振動工法を用いる場合や硬質場所での施工に対しては、施工用保護治具と継手管との一体化に継手管のネジ孔もしくは貫通孔を利用しないほうが望ましい。   However, in the case of Patent Document 3, since the screw hole or the through hole of the joint pipe is used to fix the divided piece of the joint pipe with the protective jig for construction, there is a possibility that the screw hole or the through hole is damaged. There was a problem that there was. In particular, when transmitting a tensile force between the construction protection jig and the joint pipe in the vibration method, the transmission point of this tensile force is the bolt that secures the joint pipe split piece and the construction protection jig. Therefore, the screw hole or the through hole of the joint pipe may be damaged. In particular, when the place where the steel pipe is to be embedded is very hard, the possibility that the screw hole or the through hole of the joint pipe is damaged is further increased. Therefore, it is desirable not to use the screw hole or the through hole of the joint pipe for the integration of the construction protection jig and the joint pipe when the vibration method is used for embedding or construction in a hard place.

本発明は、上記問題を解決する為になされたものであって、鋼管の差込式継手管を変形または損傷させることなく、鋼管を確実かつ容易に埋設することができる、内側継手管を備えた鋼管の施工用保護治具および鋼管の施工方法を提供する。   The present invention has been made to solve the above problems, and includes an inner joint pipe that can embed a steel pipe reliably and easily without deforming or damaging the plug-in joint pipe of the steel pipe. A steel pipe construction protection jig and a steel pipe construction method are provided.

（１）上記問題を解決する為に、本発明に係る鋼管の継手管の施工用保護治具は、一方の端部が鋼管に接続されていて、圧縮力を前記鋼管に伝達するための段部と、前記鋼管と接続された端部から前記段部までの間に配置された、前記鋼管の板厚よりも板厚の厚い肉厚部と、を有し、外側継手管と対になって差込式継手構造を構成する内側継手管を備えた鋼管に対して使用する施工用保護治具であって、前記内側継手管の鋼管とは接続されていない側の端部から前記段差までの高さと前記肉厚部の高さとの和よりも高い高さを有する筒体を備え、前記筒体の内壁面には、前記内側継手管の段部に当接し、鋼管の施工時に与えられる打撃力を伝達するための当接部が設けられると共に、前記筒体の前記肉厚部と対向する位置には、前記鋼管の施工時に与えられる引張力を前記内側継手管に伝達するための引張力伝達手段とを備えたことを特徴とする。
（２）上記問題を解決する為に、本発明に係る鋼管の継手管の施工用保護治具は、一方の端部が鋼管に接続されていて、圧縮力を前記鋼管に伝達するための段部と、前記鋼管と接続された端部から前記段部までの間に配置された、前記鋼管の板厚よりも板厚の厚い肉厚部と、該肉厚部の外周面に設けられたに突起または溝と、を有し、外側継手管と対になって差込式継手構造を構成する内側継手管を備えた鋼管に対して使用する施工用保護治具であって、前記内側継手管の鋼管とは接続されていない側の端部から前記段差までの高さと前記肉厚部の高さとの和よりも高い高さを有する筒体を備え、前記筒体の内壁面には、前記内側継手管の段部に当接し、鋼管の施工時に与えられる打撃力を伝達するための当接部が設けられると共に、前記筒体の内壁面には、前記肉厚部に設けられた突起または溝と嵌合する溝または突起が設けられていることを特徴とする。
（３）上記（１）または（２）において、筒体の上部には、鋼管の施工時に打撃力もしくは引張力が付与される上端部が設けられていることを特徴とする。
（４）上記（１）から（３）において、筒体の下端部には複数の分割片が設けられていることを特徴とする。
（５）上記（１）から（４）において、内側継手管の内周面にほぼ当接するように配置されたガイド管を備えることを特徴とする。
（６）上記（１）から（４）において、内側継手管の内周面にほぼ当接するように配置された複数のガイド板を備えることを特徴とする。
（７）上記問題を解決する為に、本発明に係る鋼管の継手管の施工用保護治具は、一方の端部が鋼管に接続されていて、圧縮力を前記鋼管に伝達するための段部と、前記鋼管と接続された端部から前記段部までの間に配置された、前記鋼管の板厚よりも板厚の厚い肉厚部と、該肉厚部に設けられたネジ孔と、を有し、外側継手管と対になって差込式継手構造を構成する内側継手管を備えた鋼管に対して使用する施工用保護治具であって、前記内側継手管の鋼管とは接続されていない側の端部から前記段差までの高さと前記肉厚部の高さとの和よりも高い高さを有する筒体を備え、前記筒体の内壁面には、前記内側継手管の段部に当接し、鋼管の施工時に与えられる打撃力を伝達するための当接部が設けられると共に、前記筒体の内壁面には、前記ネジ孔に対向する位置に貫通孔が設けられていることを特徴とする。
（８）上記（７）において、筒体の上部には、鋼管の施工時に打撃力もしくは引張力が付与される上端部が設けられていることを特徴とする。
（９）上記（７）から（８）において、筒体の下端部には複数の分割片が設けられていることを特徴とする。
（１０）上記（７）から（９）において、内側継手管の内周面にほぼ当接するように配置されたガイド管を備えることを特徴とする。
（１１）上記（７）から（９）において、内側継手管の内周面にほぼ当接するように配置された複数のガイド板を備えることを特徴とする。
（１２）上記問題を解決する為に、本発明に係る鋼管の継手管の施工用保護治具は、一方の端部が鋼管に接続されていて、圧縮力を前記鋼管に伝達するための段部と、前記鋼管と接続された端部から前記段部までの間に配置された、前記鋼管の板厚よりも板厚の厚い肉厚部と、を有し、外側継手管と対になって差込式継手構造を構成する内側継手管を備えた鋼管に対して使用する施工用保護治具であって、前記内側継手管の鋼管とは接続されていない側の端部から前記段差までの高さと前記肉厚部の高さとの和よりも高い高さを有する筒体を備え、前記筒体の内壁面には、前記内側継手管の段部に当接し、鋼管の施工時に与えられる打撃力を伝達するための当接部が設けられると共に、前記筒体の内壁面には、外側継手管と係合して引張力を伝達するために前記内側継手管の外周面に設けられている係合部に嵌合するキーを収納するキー溝が設けられ、前記筒体には、前記キー溝内に収納されているキーを前記係合部に嵌合させて固定するキー設置手段が設けられていることを特徴とする。
（１３）上記（１２）において、筒体の上部には、鋼管の施工時に打撃力もしくは引張力が付与される上端部が設けられていることを特徴とする。
（１４）上記（１２）から（１３）において、筒体の下端部には複数の分割片が設けられていることを特徴とする。
（１５）上記（１２）から（１４）において、内側継手管の内周面にほぼ当接するように配置されたガイド管を備えることを特徴とする。
（１６）上記（１２）から（１４）において、内側継手管の内周面にほぼ当接するように配置された複数のガイド板を備えることを特徴とする。
（１７）上記問題を解決する為に、本発明に係る鋼管の施工方法は、内側継手管を備えた鋼管を地中に埋設する施工方法であって、上記（１）乃至（１６）の何れか１つに記載の施工用保護治具を、前記内側継手管に装着する工程と、その後、前記鋼管を埋設するための打撃力を、前記施工用保護治具に付与する工程と、を有することを特徴とする。
（１８）上記問題を解決する為に、本発明に係る鋼管の施工方法は、内側継手管を備えた鋼管を地中に埋設する施工方法であって、上記（７）乃至（１１）の何れか１つに記載の施工用保護治具を、前記内側継手管に装着する工程と、内側継手管に装着後、ボルトを、筒体の貫通孔を貫通させて前記内側継手管のネジ孔に螺合する工程と、ボルトを螺合後、前記鋼管を埋設するための打撃力を、前記施工用保護治具に付与する工程と、を有することを特徴とする。
（１９）上記問題を解決する為に、本発明に係る鋼管の施工方法は、内側継手管を備えた鋼管を地中に埋設する施工方法であって、上記（１２）乃至（１６）の何れか１つに記載の施工用保護治具を、キー溝内にキーが収納された状態で前記内側継手管に装着する工程と、内側継手管に装着後、キー溝内に収納されているキーをキー設置手段によって前記内側継手管の係合部に嵌合させて固定する工程と、キーを固定後、前記鋼管を埋設するための打撃力を、前記施工用保護治具に付与する工程と、を有することを特徴とする。 (1) In order to solve the above problem, a steel pipe joint pipe protective jig according to the present invention has one end connected to the steel pipe, and a step for transmitting a compressive force to the steel pipe. And a thick part having a thickness greater than the thickness of the steel pipe, which is disposed between the end connected to the steel pipe and the step, and is paired with the outer joint pipe. A construction protective jig used for a steel pipe provided with an inner joint pipe constituting a plug-in joint structure, from the end of the inner joint pipe not connected to the steel pipe to the step A cylindrical body having a height higher than the sum of the thickness and the thickness of the thick portion, the inner wall surface of the cylindrical body is in contact with the stepped portion of the inner joint pipe, and is given at the time of construction of the steel pipe A contact portion for transmitting a striking force is provided, and the steel pipe is applied at a position facing the thick portion of the cylindrical body. It characterized in that a tensile force applied at and a tensile force transmitting means for transmitting to said inner joint tube.
(2) In order to solve the above problems, the steel pipe joint pipe construction protection jig according to the present invention has one end connected to the steel pipe and a step for transmitting the compressive force to the steel pipe. Disposed between the end portion connected to the steel pipe and the stepped portion, and a thick part having a thickness greater than the thickness of the steel pipe, and an outer peripheral surface of the thick part. A construction protective jig for use with a steel pipe having an inner joint pipe that forms a plug-in joint structure in a pair with the outer joint pipe. A tube having a height higher than the sum of the height from the end on the side not connected to the steel pipe to the step and the height of the thick portion, and on the inner wall surface of the tube, An abutting portion is provided for abutting the stepped portion of the inner joint pipe and transmitting a striking force applied during construction of the steel pipe. The inner wall surface of, characterized in that the grooves or protrusions to be fitted with the protrusion or groove provided in the thick portion.
(3) In the above (1) or (2), an upper end portion to which a striking force or a tensile force is applied at the time of construction of the steel pipe is provided on the upper portion of the cylindrical body.
(4) In the above (1) to (3), a plurality of divided pieces are provided at the lower end of the cylinder.
(5) In the above (1) to (4), a guide pipe is provided so as to substantially contact the inner peripheral surface of the inner joint pipe.
(6) In the above (1) to (4), a plurality of guide plates are provided so as to be substantially in contact with the inner peripheral surface of the inner joint pipe.
(7) In order to solve the above-mentioned problem, the protective jig for the construction of the joint pipe of the steel pipe according to the present invention has one end connected to the steel pipe, and a step for transmitting the compressive force to the steel pipe. A thick portion having a thickness greater than the thickness of the steel pipe, and a screw hole provided in the thick portion, disposed between the end portion connected to the steel pipe and the stepped portion. , And a construction protection jig used for a steel pipe provided with an inner joint pipe constituting a plug-in joint structure paired with an outer joint pipe, and the steel pipe of the inner joint pipe is A cylindrical body having a height higher than the sum of the height from the end on the unconnected side to the step and the height of the thick portion, and the inner wall surface of the cylindrical body has the inner joint pipe While contacting with the stepped portion, a contact portion for transmitting the striking force given at the time of construction of the steel pipe is provided, and the inner wall surface of the cylindrical body, Wherein the through hole at a position facing the serial screw hole.
(8) In the above (7), an upper end portion to which a striking force or a tensile force is applied at the time of construction of the steel pipe is provided in the upper portion of the cylindrical body.
(9) In the above (7) to (8), a plurality of divided pieces are provided at the lower end of the cylindrical body.
(10) In the above (7) to (9), a guide pipe is provided so as to substantially contact the inner peripheral surface of the inner joint pipe.
(11) In the above (7) to (9), a plurality of guide plates are provided so as to substantially contact the inner peripheral surface of the inner joint pipe.
(12) In order to solve the above-described problem, the steel pipe joint pipe protective jig according to the present invention has one end connected to the steel pipe, and a step for transmitting a compressive force to the steel pipe. And a thick part having a thickness greater than the thickness of the steel pipe, which is disposed between the end connected to the steel pipe and the step, and is paired with the outer joint pipe. A construction protective jig used for a steel pipe provided with an inner joint pipe constituting a plug-in joint structure, from the end of the inner joint pipe not connected to the steel pipe to the step A cylindrical body having a height higher than the sum of the thickness and the thickness of the thick portion, the inner wall surface of the cylindrical body is in contact with the stepped portion of the inner joint pipe, and is given at the time of construction of the steel pipe An abutting portion for transmitting the striking force is provided, and the inner wall surface of the cylindrical body is engaged with the outer joint pipe to exert a tensile force. In order to reach, a key groove for storing a key that fits into an engagement portion provided on the outer peripheral surface of the inner joint pipe is provided, and the key stored in the key groove is provided in the cylindrical body. Key installation means for fitting and fixing to the engaging portion is provided.
(13) In the above (12), an upper end portion to which a striking force or a tensile force is applied at the time of construction of the steel pipe is provided in the upper portion of the cylindrical body.
(14) In the above (12) to (13), a plurality of divided pieces are provided at a lower end portion of the cylindrical body.
(15) In the above (12) to (14), a guide pipe is provided so as to substantially contact the inner peripheral surface of the inner joint pipe.
(16) In the above (12) to (14), a plurality of guide plates are provided so as to be substantially in contact with the inner peripheral surface of the inner joint pipe.
(17) In order to solve the above problem, a steel pipe construction method according to the present invention is a construction method in which a steel pipe having an inner joint pipe is buried in the ground, and any of the above (1) to (16) A step of mounting the construction protection jig according to claim 1 on the inner joint pipe, and a step of applying a striking force for embedding the steel pipe to the construction protection jig. It is characterized by that.
(18) In order to solve the above problem, a steel pipe construction method according to the present invention is a construction method in which a steel pipe having an inner joint pipe is buried in the ground, and any of the above (7) to (11) Or the step of attaching the construction protection jig described in any one of the above to the inner joint pipe, and after the bolt is attached to the inner joint pipe, the bolt is passed through the through hole of the cylindrical body to the screw hole of the inner joint pipe. And a step of applying a striking force for embedding the steel pipe to the construction protection jig after screwing the bolt.
(19) In order to solve the above problem, a steel pipe construction method according to the present invention is a construction method in which a steel pipe having an inner joint pipe is buried in the ground, and any of the above (12) to (16) Or a step of mounting the construction protection jig according to claim 1 on the inner joint pipe in a state where the key is stored in the key groove, and a key stored in the key groove after being mounted on the inner joint pipe. Fitting with the engaging portion of the inner joint pipe by means of a key installation means, and applying a striking force for embedding the steel pipe to the construction protection jig after fixing the key; It is characterized by having.

なお、本発明において、鋼管とは、端部に前述の差込式継手構造を有する限り、鋼管コンクリート管、コンクリート管、中実の鋼管、中実の鋼管コンクリート管もしくは中実のコンクリート管等を含むものである。また、本発明において、筒（筒体を含む）とは、水平断面が円形だけで無く、水平断面形状が矩形やその他形状も含む。使用対象としている鋼管および内側継手管の水平断面形状に合わせた形状を、適宜選択する。   In the present invention, the steel pipe is a steel pipe concrete pipe, a concrete pipe, a solid steel pipe, a solid steel pipe concrete pipe, a solid concrete pipe, or the like as long as the end has the above-described plug-in joint structure. Is included. In the present invention, the cylinder (including the cylinder) includes not only a circular horizontal section but also a rectangular or other shape in the horizontal section. The shape matched with the horizontal cross-sectional shape of the steel pipe and inner joint pipe which are used is selected suitably.

本発明の鋼管の継手管の施工用保護治具および鋼管の施工方法は、継手管の部材（特に差込式継手管の分割片）に圧縮力を伝達しないと共に、継手管のネジ孔もしくは貫通孔に引張力を伝達しない構成であるので、施工方法や施工条件に拘わらず、継手管の部材（特に、分割片ならびに分割片のネジ孔もしくは貫通孔）を変形や損傷させることなく、鋼管を埋設できる。   The steel pipe joint pipe construction protecting jig and the steel pipe construction method according to the present invention do not transmit compressive force to the joint pipe member (particularly, the split piece of the plug-in joint pipe), and screw holes or through holes in the joint pipe. Since the structure does not transmit tensile force to the hole, the steel pipe can be used without deforming or damaging the joint pipe members (particularly the split pieces and screw holes or through holes of the split pieces) regardless of the construction method and conditions. Can be buried.

施工用保護治具の第１の実施の形態を模式的に示す縦断面図と側面図である。It is the longitudinal cross-sectional view and side view which show typically 1st Embodiment of the protection jig for construction. 施工用保護治具の第２の実施の形態を模式的に示す縦断面図と側面図である。It is the longitudinal cross-sectional view and side view which show typically 2nd Embodiment of the protection jig for construction. 施工用保護治具の第３の実施の形態を模式的に示す縦断面図と側面図である。（ａ）は内ガイド板式、（ｂ）は内ガイド管式を示す。It is the longitudinal cross-sectional view and side view which show typically 3rd Embodiment of the protection jig for construction. (A) shows an inner guide plate type, and (b) shows an inner guide tube type. 施工用保護治具の第４の実施の形態を模式的に示す縦断面図と側面図である。It is the longitudinal cross-sectional view and side view which show typically 4th Embodiment of the protection jig for construction. 施工用保護治具の第５の実施の形態を模式的に示す縦断面図と側面図である。It is the longitudinal cross-sectional view and side view which show typically 5th Embodiment of the protection jig for construction. 施工用保護治具の第６の実施の形態を模式的に示す縦断面図と側面図である。It is the longitudinal cross-sectional view and side view which show typically 6th Embodiment of the protection jig for construction. 施工用保護治具の第７の実施の形態を模式的に示す縦断面図と側面図である。It is the longitudinal cross-sectional view and side view which show typically 7th Embodiment of the protection jig for construction. 施工用保護治具の第７の実施の形態における装着状態の説明図である。It is explanatory drawing of the mounting state in 7th Embodiment of the protection jig for construction. 本発明に係る鋼管の施工方法の例を説明する工程の流れ図である。It is a flowchart of the process explaining the example of the construction method of the steel pipe concerning this invention. 図９の流れ図を、模式的に示した側面図である。（ａ）から（ｅ）までの順番が工程順を示す。It is the side view which showed the flowchart of FIG. 9 typically. The order from (a) to (e) indicates the process order. 打撃ハンマーで施工する場合の施工用保護治具の一例を、模式的に示す縦断面図と側面図である。It is the longitudinal cross-sectional view and side view which show typically an example of the protection jig for construction in the case of constructing with a hammer. 本発明に係る鋼管の施工方法の別の例を説明する工程の流れ図である。It is a flowchart of the process explaining another example of the construction method of the steel pipe concerning the present invention. 図１２の流れ図を、模式的に示した側面図である。（ａ）から（ｅ）までの順番が工程順を示す。It is the side view which showed the flowchart of FIG. 12 typically. The order from (a) to (e) indicates the process order. 差込式継手における係合部材の変形例を模式的に示す側面図である。（ａ）は全ての分割片が内側に倒れた場合で、（ｂ）は全ての分割片が外側に倒れた場合を示す。It is a side view which shows typically the modification of the engaging member in an insertion type coupling. (A) is a case where all the divided pieces have fallen inward, and (b) shows a case where all the divided pieces have fallen outward. 鋼管の差込式継手構造の一例を示した図である。（ａ）斜視図と（ｂ）縦断面図である。It is the figure which showed an example of the insertion type joint structure of a steel pipe. (A) Perspective view and (b) longitudinal sectional view. 鋼管の差込式継手構造の別の例を示した図である。（ａ）斜視図と（ｂ）縦断面図である。It is the figure which showed another example of the insertion type joint structure of a steel pipe. (A) Perspective view and (b) longitudinal sectional view.

先ず、差込式継手管の説明をした後、実施の形態に基づき、本発明について詳細に説明する。   First, after describing the plug-in joint pipe, the present invention will be described in detail based on the embodiment.

（１）鋼管の差込式継手構造の例：その１
図１５は鋼管の差込式継手構造の一例を示すものであって、（ａ）は接合前の斜視図、（ｂ）は接合後の縦断面図である。符号３の差込式継手構造は、内側継手管１０と外側継手管２０とが対になっており、鋼管１に取り付けられた内側継手管１０に、鋼管２に取り付けられた外側継手管２０を差し込むことで、鋼管１と鋼管２を連結するものである。 (1) Example of steel pipe plug-in joint structure: Part 1
FIG. 15 shows an example of a steel pipe plug-in joint structure, where (a) is a perspective view before joining, and (b) is a longitudinal sectional view after joining. In the plug-in joint structure denoted by reference numeral 3, the inner joint pipe 10 and the outer joint pipe 20 are paired, and the outer joint pipe 20 attached to the steel pipe 2 is attached to the inner joint pipe 10 attached to the steel pipe 1. By inserting, the steel pipe 1 and the steel pipe 2 are connected.

外側継手管２０は、その外径が鋼管２の外径とほぼ等しく、鋼管２とは、基端部２１（高さｈ２１）の上端にて、溶接により接合されている。基端部２１は、鋼管２の板厚よりも板厚が厚い肉厚部２１ａ（高さｈ２１ａ）を備えている。基端部２１からさらに先端側には、所定の範囲で内径が拡径された凹部２３が、内周面に形成されており、凹部２３の先端側の縁部には係止部２４が形成されている。また、凹部２３には複数の貫通孔２５が設けられている。   The outer joint pipe 20 has an outer diameter substantially equal to the outer diameter of the steel pipe 2, and is joined to the steel pipe 2 by welding at the upper end of the base end portion 21 (height h21). The base end portion 21 includes a thick portion 21a (height h21a) that is thicker than the thickness of the steel pipe 2. A concave portion 23 whose inner diameter is enlarged within a predetermined range is formed on the inner peripheral surface further on the distal end side from the base end portion 21, and a locking portion 24 is formed on the edge portion on the distal end side of the concave portion 23. Has been. The recess 23 is provided with a plurality of through holes 25.

内側継手管１０は、鋼管１の外径とほぼ等しい外径の同径部１１（高さｈ１１）を有する。この同径部１１の下端に、鋼管１が溶接により接続されている。また同径部１１は、鋼管１の板厚よりも板厚が厚い肉厚部１１ａ（高さｈ１１ａ）を備えている。   The inner joint pipe 10 has the same diameter portion 11 (height h11) having an outer diameter substantially equal to the outer diameter of the steel pipe 1. The steel pipe 1 is connected to the lower end of the same diameter portion 11 by welding. Moreover, the same diameter part 11 is provided with the thick part 11a (height h11a) whose plate | board thickness is thicker than the plate | board thickness of the steel pipe 1. FIG.

内側継手管１０の同径部１１の上端には段部１２を介して、外側継手管２０の内径とほぼ等しい外径の本体部１８（高さｈ１８）が設けられている。そして、本体部１８は複数の分割片１３を有している。これら分割片１３は、周方向にほぼ等間隔で配置された段部１２から先端に達する複数のスリット１４により、本体部１８を縮径させる機能を有している。   A main body 18 (height h18) having an outer diameter substantially equal to the inner diameter of the outer joint pipe 20 is provided at the upper end of the same diameter part 11 of the inner joint pipe 10 via a stepped part 12. The main body 18 has a plurality of divided pieces 13. These divided pieces 13 have a function of reducing the diameter of the main body portion 18 by a plurality of slits 14 reaching the tip from the step portions 12 arranged at substantially equal intervals in the circumferential direction.

内側継手管１０の各分割片１３の外周面には、係合突部１６が突設されており、係合突部１６の下面１６ａは外周面と直交しており、かつ係合突部１６の上部には傾斜面１６ｂが設けられている。符号１７は各分割片１３の係合突部１６の上方に設けたネジ孔で、このネジ孔１７は外側継手管２０に設けた貫通孔２５の位置に対応して設けられている。   Engagement protrusions 16 are provided on the outer peripheral surface of each divided piece 13 of the inner joint pipe 10, and the lower surface 16 a of the engagement protrusion 16 is orthogonal to the outer peripheral surface, and the engagement protrusion 16. An inclined surface 16b is provided on the top of the. Reference numeral 17 denotes a screw hole provided above the engaging protrusion 16 of each divided piece 13, and this screw hole 17 is provided corresponding to the position of the through hole 25 provided in the outer joint pipe 20.

内側継手管１０の係合突部１６の下面１６ａから段部１２までの高さは、外側継手管２０の係止部２４から先端２６までの高さとほぼ等しく形成されている。   The height from the lower surface 16a of the engagement protrusion 16 of the inner joint pipe 10 to the step portion 12 is formed to be substantially equal to the height from the locking part 24 to the tip 26 of the outer joint pipe 20.

図１５（ｂ）の状態で、図１５（ａ）に示すボルト３０を貫通孔２５に挿入しネジ孔１７に螺合すれば、内側継手管１０と外側継手管２０は接合され、鋼管１、２が接合される。   15B, when the bolt 30 shown in FIG. 15A is inserted into the through hole 25 and screwed into the screw hole 17, the inner joint pipe 10 and the outer joint pipe 20 are joined, and the steel pipe 1, 2 are joined.

接合された鋼管１、２においては、内側継手管１０の段差１２と外側継手管２０の先端２６が当接する。鋼管２に加わる圧縮力は、内側継手管１０の段部１２と外側継手管２０の先端２６を介して鋼管１に伝達され、引張力は、内側継手管１０の係合突部１６と外側継手管２０の係止部２４を介して鋼管２に伝達される。   In the joined steel pipes 1 and 2, the step 12 of the inner joint pipe 10 and the tip 26 of the outer joint pipe 20 are in contact. The compressive force applied to the steel pipe 2 is transmitted to the steel pipe 1 via the step portion 12 of the inner joint pipe 10 and the tip 26 of the outer joint pipe 20, and the tensile force is applied to the engaging protrusion 16 of the inner joint pipe 10 and the outer joint. It is transmitted to the steel pipe 2 through the locking part 24 of the pipe 20.

（２）鋼管の差込式継手構造の例：その２
図１６は鋼管の差込式継手構造の他の例を示すものであって、（ａ）は接合前の斜視図、（ｂ）は接合後の縦断面図である。符号４は差込式継手構造であり、内側継手管５０と外側継手管４０とが対になっている。差込式継手構造４は、鋼管１に取り付けられた内側継手管５０に、鋼管２に取り付けられた外側継手管４０を差し込むことで、鋼管１と鋼管２を連結するものである。 (2) Example of steel pipe plug-in joint structure: Part 2
FIG. 16 shows another example of the steel pipe plug-in joint structure, in which (a) is a perspective view before joining, and (b) is a longitudinal sectional view after joining. Reference numeral 4 denotes a plug-in joint structure in which an inner joint pipe 50 and an outer joint pipe 40 are paired. The plug-in joint structure 4 connects the steel pipe 1 and the steel pipe 2 by inserting the outer joint pipe 40 attached to the steel pipe 2 into the inner joint pipe 50 attached to the steel pipe 1.

外側継手管４０は、その外径が鋼管２の外径とほぼ等しく、鋼管２とは、基端部４１（高さｈ４１）の上端にて、溶接により接合されている。基端部４１は、鋼管２の板厚よりも板厚が厚い肉厚部４１ａ（高さｈ４１ａ）を備えている。   The outer joint pipe 40 has an outer diameter substantially equal to the outer diameter of the steel pipe 2, and is joined to the steel pipe 2 by welding at the upper end of the base end portion 41 (height h41). The base end portion 41 includes a thick portion 41 a (height h 41 a) that is thicker than the thickness of the steel pipe 2.

基端部４１からさらに先端側には、内側継手管５０の本体部５２の外径よりも大きい内径の本体部４８が、段部４２を介して設けられている。本体部４８は、複数の分割片４３を有しており、この分割片４３は、周方向でほぼ等間隔な複数のスリット４４により、本体部４８を拡径させる機能を有する。スリット４４は段部４２から先端に達するものである。   A main body portion 48 having an inner diameter larger than the outer diameter of the main body portion 52 of the inner joint pipe 50 is provided on the distal end side from the base end portion 41 via the step portion 42. The main body 48 has a plurality of divided pieces 43, and the divided pieces 43 have a function of expanding the diameter of the main body 48 by a plurality of slits 44 that are substantially equally spaced in the circumferential direction. The slit 44 reaches the tip from the step portion 42.

外側継手管４０の各分割片４３の内周面には、係合突部４６が突設されており、係合突部４６の上面４６ａは内周面と直交しており、かつ係合突部４６の下部には傾斜面４６ｂが設けられている。符号４７は各分割片４３の係合突部４６より先端側に設けられた貫通孔である。   Engagement protrusions 46 are provided on the inner peripheral surface of each split piece 43 of the outer joint pipe 40, and the upper surface 46a of the engagement protrusion 46 is orthogonal to the inner peripheral surface, and the engagement protrusions. An inclined surface 46 b is provided below the portion 46. Reference numeral 47 is a through hole provided on the distal end side of the engagement protrusion 46 of each divided piece 43.

一方、内側継手管５０は、鋼管１の外径とほぼ等しい外径の同径部５１（高さｈ５１）を有する。この同径部５１の下端に、鋼管１が溶接により接続されている。また同径部５１は、鋼管１の板厚よりも板厚が厚い肉厚部５１ａ（高さｈ５１ａ）を備えている。   On the other hand, the inner joint pipe 50 has the same diameter portion 51 (height h51) having an outer diameter substantially equal to the outer diameter of the steel pipe 1. The steel pipe 1 is connected to the lower end of the same diameter portion 51 by welding. Moreover, the same diameter part 51 is provided with the thick part 51a (height h51a) whose plate | board thickness is thicker than the plate | board thickness of the steel pipe 1. FIG.

内側継手管５０の同径部５１の上端には段部５４を介して、外側継手管４０の内径とほぼ等しい外径の本体部５２（高さｈ５２）が設けられている。そして、本体部５２の外周面の軸方向のほぼ中央部から先端側に、係止突起５３が形成されており、係止突起５３の下部には係止部５３ａが形成されている。さらに、内側継手管５０の係止部５３ａよりも同径部５１の側には、外側継手管４０の貫通孔４７に対応して複数のネジ孔５５が設けられている。なお、このネジ孔５５を貫通孔とし、その内周面にナットを溶接により取付けてもよい。   A main body 52 (height h52) having an outer diameter substantially equal to the inner diameter of the outer joint pipe 40 is provided at the upper end of the same diameter part 51 of the inner joint pipe 50 via a stepped part 54. A locking projection 53 is formed on the distal end side from a substantially central portion in the axial direction of the outer peripheral surface of the main body 52, and a locking portion 53 a is formed below the locking projection 53. Furthermore, a plurality of screw holes 55 are provided on the side of the same diameter portion 51 with respect to the locking portion 53 a of the inner joint pipe 50 corresponding to the through holes 47 of the outer joint pipe 40. The screw hole 55 may be a through hole, and a nut may be attached to the inner peripheral surface thereof by welding.

外側継手管４０の係合突部４６の上面４６ａから段部４２までの高さは、内側継手管５０の係止部５３ａから先端５６までの高さとほぼ等しく形成されている。   The height from the upper surface 46 a of the engaging projection 46 of the outer joint pipe 40 to the stepped part 42 is formed to be substantially equal to the height from the locking part 53 a of the inner joint pipe 50 to the tip 56.

図１６（ｂ）の状態で、図示しないボルトを貫通孔４７に挿入しネジ孔５５に螺合すれば、内側継手管５０と外側継手管４０は接合され、鋼管１、２が接合される。   When a bolt (not shown) is inserted into the through hole 47 and screwed into the screw hole 55 in the state of FIG. 16B, the inner joint pipe 50 and the outer joint pipe 40 are joined, and the steel pipes 1 and 2 are joined.

接合された鋼管１、２においては、外側継手管４０の段部４２に内側継手管５０の先端５６が当接する。鋼管２に加わる圧縮力は、外側継手管４０の段部４２と内側継手管５０の先端５６を介して鋼管１に伝達され、引張力は、外側継手管４０の係合突部の上面４６ａと内側継手管５０の係止部５３ａを介して鋼管２に伝達される。   In the joined steel pipes 1 and 2, the tip 56 of the inner joint pipe 50 contacts the stepped portion 42 of the outer joint pipe 40. The compressive force applied to the steel pipe 2 is transmitted to the steel pipe 1 via the step portion 42 of the outer joint pipe 40 and the tip 56 of the inner joint pipe 50, and the tensile force is applied to the upper surface 46 a of the engaging protrusion of the outer joint pipe 40. It is transmitted to the steel pipe 2 via the locking portion 53a of the inner joint pipe 50.

（３）施工用保護治具の例：第１の実施の形態
施工用保護治具の一例について、第１の実施の形態として説明する。図１に、第１の実施の形態に係る施工用保護治具を、内側継手管に被せた例で模式的に示す。向かって左側が縦断面図、右側が側面図である。用いた内側継手管は、図１５を用いて上記（１）で説明した分割片１３を有した内側継手管１０と、基本的に同一の構造であり、図１５と同一の部分は同一の符号により示し、詳細な説明は省略する。 (3) Example of construction protection jig: first embodiment An example of a construction protection jig will be described as a first embodiment. FIG. 1 schematically shows an example in which the construction protection jig according to the first embodiment is placed on the inner joint pipe. The left side is a longitudinal sectional view, and the right side is a side view. The inner joint pipe used has basically the same structure as the inner joint pipe 10 having the divided pieces 13 described in (1) above with reference to FIG. 15, and the same parts as those in FIG. Detailed description will be omitted.

図１において、鋼管１に接合された内側継手管１０は、同径部１１、同径部１１における肉厚部１１ａ、段部１２、本体部１８、分割片１３、スリット１４、分割片１３の外周面に設けられた係合突部１６およびネジ孔１７を有している。また、同径部１１の高さをｈ１１、肉厚部１１ａの高さをｈ１１ａ、本体部１８の高さをｈ１８とする。   In FIG. 1, the inner joint pipe 10 joined to the steel pipe 1 includes the same diameter portion 11, a thick portion 11 a in the same diameter portion 11, a step portion 12, a main body portion 18, a split piece 13, a slit 14, and a split piece 13. It has an engaging projection 16 and a screw hole 17 provided on the outer peripheral surface. The height of the same diameter portion 11 is h11, the thickness of the thick portion 11a is h11a, and the height of the main body portion 18 is h18.

一方、施工用保護治具６は、内側継手管１０の本体部１８の高さｈ１８と肉厚部１１ａの高さｈ１１ａとの和、即ちｈ１８＋ｈ１１ａ、よりも高い高さの筒体６０からなる。筒体６０の高さをｈ６０とする。   On the other hand, the construction protection jig 6 includes a cylindrical body 60 having a height higher than the sum of the height h18 of the main body portion 18 of the inner joint pipe 10 and the height h11a of the thick portion 11a, that is, h18 + h11a. The height of the cylinder 60 is set to h60.

筒体６０の内壁面には、施工用保護治具６を内側継手管１０に被せた際に、内側継手管１０の段部１２と当接する当接部６１が設けられている。筒体６０の内径は、場所により2種類の径を有する。即ち、当接部６１より上端側は、内側継手管１０の本体部１８が進
入自在な内径となっている。一方、当接部６１より下端側は、内側継手管１０の同径部１１が進入可能な内径となっている。 The inner wall surface of the cylindrical body 60 is provided with a contact portion 61 that comes into contact with the step portion 12 of the inner joint pipe 10 when the construction protection jig 6 is put on the inner joint pipe 10. The inner diameter of the cylindrical body 60 has two types of diameters depending on the location. That is, the upper end side from the contact portion 61 has an inner diameter through which the main body portion 18 of the inner joint pipe 10 can enter. On the other hand, the lower end side from the contact portion 61 has an inner diameter into which the same diameter portion 11 of the inner joint pipe 10 can enter.

施工用保護治具６において、筒体６０よりも上端側で高さｈ６２の部分を上端部６２と呼び、この上端部６２に、施工の際、バイブロハンマや打撃ハンマ等の施工機器から、打撃力や引張力が付与される。本実施の形態の場合、バイブロハンマが把持可能なように、上端部６２はつかみ代６２ａとなっている。   In the construction protection jig 6, a portion having a height h 62 on the upper end side from the cylindrical body 60 is referred to as an upper end portion 62, and an impact force is applied to the upper end portion 62 from construction equipment such as a vibratory hammer or a hammer. And tensile force is applied. In the case of the present embodiment, the upper end 62 has a gripping margin 62a so that the vibrator hammer can be gripped.

筒体６０の下端部には、分割片６６が設けられている。これら分割片６６は、周方向にほぼ等間隔で配置された、下端から適当な長さの複数のスリット６７により、筒体６０の下端部を拡径させ、内側継手管１０への装着を容易にする機能を有している。   A split piece 66 is provided at the lower end of the cylindrical body 60. These split pieces 66 are arranged at substantially equal intervals in the circumferential direction, and the plurality of slits 67 having an appropriate length from the lower end increase the diameter of the lower end portion of the cylindrical body 60 and can be easily attached to the inner joint pipe 10. It has a function to make.

本実施の形態においては、つかみ代６２ａを通じて上端部６２に与えられた引張力を内側継手管１０に伝達する引張力伝達手段として、筒体６０の内壁面で、内側継手管１０の肉厚部１１ａと対向する位置に、複数の貫通孔６４ａを設けた。この時、肉厚部１１ａには、内側継手管１０に施工用保護治具６を被せた状態で貫通孔６４ａと対応する位置に、ネジ孔１９ａを設けておく。図１に示す状態で、貫通孔６４ａにボルト３０を挿入してネジ孔１９ａに螺合すれば、内側継手管１０と施工用保護治具６とは確実に接合される。   In the present embodiment, as the tensile force transmitting means for transmitting the tensile force applied to the upper end 62 through the gripping margin 62 a to the inner joint pipe 10, the thick part of the inner joint pipe 10 is formed on the inner wall surface of the cylindrical body 60. A plurality of through holes 64a are provided at positions facing 11a. At this time, a screw hole 19a is provided in the thick portion 11a at a position corresponding to the through hole 64a in a state where the inner joint pipe 10 is covered with the construction protection jig 6. When the bolt 30 is inserted into the through hole 64a and screwed into the screw hole 19a in the state shown in FIG. 1, the inner joint pipe 10 and the construction protection jig 6 are reliably joined.

本実施の形態によれば、例えば、鋼管１を地中に埋設する場合にバイブロハンマから与えられる圧縮力は、まず、施工用保護治具６の筒体６０の上端部６２（より正確にはつかみ代６２ａ）に付与され、そして、筒体６０の当接部６１から内側継手管１０の段部１２へ伝達されるので、分割片１３とネジ孔１７に圧縮力が作用せず、分割片１３が変形（座屈等）したりネジ孔１７が破損することはない。また、施工用保護治具６は、ボルト３０により接合されているので、打撃時のリバウンド等により落下する危険もない。同時に、施工用保護治具が円周方向に回転してしまうことも無い。   According to the present embodiment, for example, when the steel pipe 1 is embedded in the ground, the compressive force applied from the vibro hammer is firstly grasped at the upper end 62 (more accurately, the cylindrical body 60 of the construction protection jig 6). And is transmitted from the contact portion 61 of the cylindrical body 60 to the step portion 12 of the inner joint pipe 10, so that the compression force does not act on the divided piece 13 and the screw hole 17, and the divided piece 13 Is not deformed (buckled or the like) or the screw hole 17 is not damaged. Moreover, since the construction protection jig 6 is joined by the bolt 30, there is no risk of dropping due to rebound at the time of impact. At the same time, the construction protection jig does not rotate in the circumferential direction.

一方、例えばバイブロハンマによる引張力といった、鋼管１を持ち上げる力は、施工用保護治具６の貫通孔６４ａからボルト３０を介して、内側継手管１０のネジ孔１９ａに伝達される。この為、分割片１３のネジ孔１７に引張力が作用せず、やはりネジ孔１７が破損することはない。ここで、ネジ孔１９ａは、内側継手管１０の肉厚部１１ａに設けられているので、ボルト３０との接触面積が確保され、ボルト３０からの引張力を効率良く内側継手管１０に伝達することができると共に、最も頑強な箇所に設けられており、当該ネジ孔１９ａが破損する可能性を最小限にできる。   On the other hand, a force for lifting the steel pipe 1, such as a tensile force generated by a vibro hammer, is transmitted from the through hole 64 a of the construction protection jig 6 to the screw hole 19 a of the inner joint pipe 10 through the bolt 30. For this reason, a tensile force does not act on the screw hole 17 of the split piece 13, and the screw hole 17 is not damaged. Here, since the screw hole 19a is provided in the thick part 11a of the inner joint pipe 10, a contact area with the bolt 30 is secured, and the tensile force from the bolt 30 is efficiently transmitted to the inner joint pipe 10. In addition, the screw hole 19a is provided at the most robust location, and the possibility of the screw hole 19a being damaged can be minimized.

また、施工に際しては、施工用保護治具６が内側継手管１０に対して傾斜したり水平方向に移動したりすることがないから、内側継手管１０の損傷、例えば図１４（ａ）と（ｂ）に示した如く、分割片１３が内側や外側に倒れたり、もしくは、ある分割片１３は内側に、これと対角位置にある分割片１３は外側に向かって倒れたりすることがない。   Further, during construction, the construction protection jig 6 does not tilt or move in the horizontal direction with respect to the inner joint pipe 10, so that damage to the inner joint pipe 10, for example, FIG. As shown in b), the divided piece 13 does not fall inward or outward, or a certain divided piece 13 does not fall inward, and the divided piece 13 that is in a diagonal position with this does not fall outward.

さらに、ボルト３０を取り外せば、施工用保護治具６と内側継手管１０との接合は容易に解ける。よって、ボルト３０を取り外した後、施工用保護治具６を内側継手管１０から軸方向に引き抜けば、分割片６６が外側に撓んで拡径することもあり、施工用保護治具６は容易に取り外すことができる。   Furthermore, if the bolt 30 is removed, the connection between the construction protection jig 6 and the inner joint pipe 10 can be easily released. Therefore, if the construction protection jig 6 is pulled out from the inner joint pipe 10 in the axial direction after the bolt 30 is removed, the split piece 66 may be bent outwardly to expand the diameter. It can be easily removed.

（４）施工用保護治具の例：第２の実施の形態
施工用保護治具の別の例について、第２の実施の形態として説明する。図２に、第２の実施の形態に係る施工用保護治具を、内側継手管に被せた例で模式的に示す。向かって左側が縦断面図、右側が側面図である。用いた内側継手管は、図１５を用いて上記（１）で説明した分割片１３を有した内側継手管１０と、基本的に同一の構造であり、図１５と同一の部分は同一の符号により示し、詳細な説明は省略する。また、第２の実施の形態に係る施工用保護治具についても、図１と同一の部分は同一の符号により示し、詳細な説明は省略する。 (4) Example of protection jig for construction: second embodiment Another example of the protection jig for construction will be described as a second embodiment. FIG. 2 schematically shows an example in which the construction protection jig according to the second embodiment is placed on the inner joint pipe. The left side is a longitudinal sectional view, and the right side is a side view. The inner joint pipe used has basically the same structure as the inner joint pipe 10 having the divided pieces 13 described in (1) above with reference to FIG. 15, and the same parts as those in FIG. Detailed description will be omitted. Moreover, also about the construction protection jig which concerns on 2nd Embodiment, the part same as FIG. 1 is shown with the same code | symbol, and detailed description is abbreviate | omitted.

図２において、鋼管１に接合された内側継手管１０は、高さｈ１１の同径部１１、高さｈ１１ａの肉厚部１１ａ、段部１２、高さｈ１８の本体部１８、分割片１３、スリット１４、分割片１３の外周面に設けられた係合突部１６、およびネジ孔１７を有している。   In FIG. 2, the inner joint pipe 10 joined to the steel pipe 1 has the same diameter part 11 of height h11, the thick part 11a of height h11a, the step part 12, the main body part 18 of height h18, the divided piece 13, It has a slit 14, an engagement protrusion 16 provided on the outer peripheral surface of the divided piece 13, and a screw hole 17.

一方、施工用保護治具６は、内側継手管１０の本体部１８の高さｈ１８と肉厚部１１ａの高さｈ１１ａとの和、即ちｈ１８＋ｈ１１ａ、よりも高い高さｈ６０の筒体６０と、上端部６２とからなる。筒体６０の内壁面には、当接部６１が設けられている。また、上端部６２として、つかみ代６２ａが設けられている。さらに、筒体６０の下端部には、分割片６６と複数のスリット６７が設けられており、筒体６０の下端部を拡径させ、内側継手管１０への装着を容易にする。   On the other hand, the construction protection jig 6 includes a cylindrical body 60 having a height h60 higher than the sum of the height h18 of the main body portion 18 of the inner joint pipe 10 and the height h11a of the thick portion 11a, that is, h18 + h11a, It consists of an upper end 62. A contact portion 61 is provided on the inner wall surface of the cylindrical body 60. Further, as the upper end portion 62, a grip allowance 62a is provided. Furthermore, a split piece 66 and a plurality of slits 67 are provided at the lower end portion of the cylindrical body 60, and the diameter of the lower end portion of the cylindrical body 60 is increased to facilitate attachment to the inner joint pipe 10.

本実施の形態においては、この分割片６６に、貫通孔６５ａが設けられている。一方、図２の場合、鋼管１に、内側継手管１０に施工用保護治具６を被せた状態で貫通孔６５ａと対応する位置に、ネジ孔１９ｃを設けておく。図２に示す状態で、貫通孔６５ａにボルト３０を挿入してネジ孔１９ｃに螺合すれば、内側継手管１０と施工用保護治具６とは確実に接合される。なお、ネジ孔１９ｃは、鋼管１ではなく、内側継手管１０の肉厚部１１ａよりも鋼管寄りの箇所に設けても良い。また、ネジ孔１９ｃを貫通孔とし、その内周面にナットを溶接により取付けてもよい。   In the present embodiment, the split piece 66 is provided with a through hole 65a. On the other hand, in the case of FIG. 2, the screw hole 19c is provided in the steel pipe 1 in the position corresponding to the through-hole 65a in the state which covered the inner joint pipe 10 with the construction protection jig 6. FIG. In the state shown in FIG. 2, if the bolt 30 is inserted into the through hole 65a and screwed into the screw hole 19c, the inner joint pipe 10 and the construction protection jig 6 are reliably joined. The screw hole 19c may be provided not at the steel pipe 1 but at a location closer to the steel pipe than the thick portion 11a of the inner joint pipe 10. Further, the screw hole 19c may be a through hole, and a nut may be attached to the inner peripheral surface thereof by welding.

さらに本実施の形態においては、つかみ代６２ａを通じて上端部６２に与えられた引張力を内側継手管１０に伝達する引張力伝達手段として、筒体６０の内壁面で、内側継手管１０の肉厚部１１ａと対向する位置に、断面矩形の突起６４ｂを設けた。この時、内側継手管１０の肉厚部１１ａには、内側継手管１０に施工用保護治具６を被せた状態で当該突起６４ｂと対応する位置に、凹溝１９ｂを設けておく。内側継手管１０に施工用保護治具６を被せた状態で、施工用保護治具６の突起６４ｂは内側継手管１０の凹溝１９ｂに嵌合する。   Further, in the present embodiment, as the tensile force transmitting means for transmitting the tensile force applied to the upper end 62 through the gripping margin 62a to the inner joint pipe 10, the wall thickness of the inner joint pipe 10 is formed on the inner wall surface of the cylindrical body 60. A protrusion 64b having a rectangular cross section was provided at a position facing the portion 11a. At this time, the thick part 11a of the inner joint pipe 10 is provided with a concave groove 19b at a position corresponding to the projection 64b in a state where the inner joint pipe 10 is covered with the construction protection jig 6. In a state where the inner protection pipe 6 is covered with the construction protection jig 6, the protrusion 64 b of the construction protection jig 6 is fitted into the concave groove 19 b of the inner joint pipe 10.

本実施の形態によれば、例えば、鋼管１を地中に埋設する場合にバイブロハンマから与えられる圧縮力は、まず、施工用保護治具６の筒体６０の上端部６２（より正確にはつかみ代６２ａ）に付与され、そして、筒体６０の当接部６１から内側継手管１０の段部１２へ伝達されるので、分割片１３とネジ孔１７に圧縮力が作用せず、分割片１３が変形（座屈等）したりネジ孔１７が破損することはない。また、ボルト３０により接合されているので、打撃時のリバウンド等により、施工用保護治具６が落下する危険もない。同時に、施工用保護治具６が円周方向に回転してしまうことも無い。   According to the present embodiment, for example, when the steel pipe 1 is embedded in the ground, the compressive force applied from the vibro hammer is firstly grasped at the upper end 62 (more accurately, the cylindrical body 60 of the construction protection jig 6). And is transmitted from the contact portion 61 of the cylindrical body 60 to the step portion 12 of the inner joint pipe 10, so that the compression force does not act on the divided piece 13 and the screw hole 17, and the divided piece 13 Is not deformed (buckled or the like) or the screw hole 17 is not damaged. Moreover, since it has joined with the volt | bolt 30, there is also no danger that the construction protection jig | tool 6 will fall by the rebound at the time of impact, etc. At the same time, the construction protection jig 6 does not rotate in the circumferential direction.

一方、例えばバイブロハンマによる引張力といった、鋼管１を持ち上げる力は、施工用保護治具６の突起６４ｂから、突起６４ｂの上面と凹溝１９ｂとの当接面を介して、内側継手管１０に伝達される。この為、分割片１３のネジ孔１７に引張力が作用せず、やはりネジ孔１７が破損することはない。ここで、凹溝１９ｂは、内側継手管１０の肉厚部１１ａに設けられているので、施工用保護治具６の突起６４ｂとの接触面積が確保され、突起６４ｂからの引張力を効率良く内側継手管１０に伝達することができると共に、最も頑強な箇所に設けられており、当該凹溝１９ｂが破損する可能性を最小限にできる。   On the other hand, a force for lifting the steel pipe 1 such as a tensile force generated by a vibro hammer is transmitted from the protrusion 64b of the construction protection jig 6 to the inner joint pipe 10 through the contact surface between the upper surface of the protrusion 64b and the concave groove 19b. Is done. For this reason, a tensile force does not act on the screw hole 17 of the split piece 13, and the screw hole 17 is not damaged. Here, since the concave groove 19b is provided in the thick part 11a of the inner joint pipe 10, a contact area with the projection 64b of the construction protection jig 6 is ensured, and the tensile force from the projection 64b is efficiently obtained. While being able to transmit to the inner joint pipe | tube 10, it is provided in the strongest location and the possibility that the said concave groove 19b will be damaged can be minimized.

また、施工に際しては、施工用保護治具６が内側継手管１０に対して傾斜したり水平方向に移動したりすることがないから、内側継手管１０の損傷、例えば図１４（ａ）と（ｂ）に示した如く、分割片１３が内側や外側に倒れたり、もしくは、ある分割片１３は内側に、これと対角位置にある分割片１３は外側に向かって倒れたりすることがない。   Further, during construction, the construction protection jig 6 does not tilt or move in the horizontal direction with respect to the inner joint pipe 10, so that damage to the inner joint pipe 10, for example, FIG. As shown in b), the divided piece 13 does not fall inward or outward, or a certain divided piece 13 does not fall inward, and the divided piece 13 that is in a diagonal position with this does not fall outward.

さらに、ボルト３０を取り外せば、施工用保護治具６と内側継手管１０との接合は容易に解ける。よって、ボルト３０を取り外した後、分割片６６を外側に撓めて拡径させて、施工用保護治具６を内側継手管１０から軸方向に引き抜けば、施工用保護治具６は容易に取り外すことができる。   Furthermore, if the bolt 30 is removed, the connection between the construction protection jig 6 and the inner joint pipe 10 can be easily released. Therefore, after the bolt 30 is removed, if the split piece 66 is bent outward to expand the diameter, and the construction protection jig 6 is pulled out from the inner joint pipe 10 in the axial direction, the construction protection jig 6 is easy. Can be removed.

（５）施工用保護治具の例：第３の実施の形態
上述した第１の実施の形態の別の例を、第３の実施の形態として説明する。図３に、第３の実施の形態に係る施工用保護治具を、模式的に示す。向かって左側が縦断面図、右側が側面図であって、（ａ）は内ガイド板式、（ｂ）は内ガイド管式である。図示した内側継手管は、図１５を用いて上記（１）で説明した分割片１３を有した内側継手管１０と、基本的に同一の構造であり、図１５と同一の部分は同一の符号により示し、詳細な説明は省略する。また、第３の実施の形態に係る施工用保護治具についても、図１と同一の部分は同一の符号により示し、詳細な説明は省略する。 (5) Example of protective jig for construction: Third embodiment Another example of the above-described first embodiment will be described as a third embodiment. FIG. 3 schematically shows a construction protection jig according to the third embodiment. The left side is a longitudinal sectional view, the right side is a side view, (a) is an inner guide plate type, and (b) is an inner guide tube type. The illustrated inner joint pipe has basically the same structure as the inner joint pipe 10 having the divided pieces 13 described in (1) above with reference to FIG. 15, and the same parts as those in FIG. Detailed description will be omitted. Moreover, also about the construction protection jig | tool which concerns on 3rd Embodiment, the part same as FIG. 1 is shown with the same code | symbol, and detailed description is abbreviate | omitted.

図３の（ａ）において、上端部６２は、筒体６０に接合された厚肉管または厚肉円盤からなる鏡板７２と、鏡板７２の上面に設置されたクッション枠７４と、鏡板７２の上面でクッション枠７４内に載置されたクッション７５とを備えている。さらに、鏡板７２の下面には、内ガイド板７３が、角120°で3枚放射状に設置されている。   In FIG. 3A, the upper end portion 62 includes an end plate 72 made of a thick tube or a thick disc joined to the cylindrical body 60, a cushion frame 74 installed on the upper surface of the end plate 72, and an upper surface of the end plate 72. And a cushion 75 placed in the cushion frame 74. Further, on the lower surface of the end plate 72, three inner guide plates 73 are radially arranged at an angle of 120 °.

そして、本体部１８に筒体６０を被せて当接部６１が内側継手管１０の段部１２に当接した際、内ガイド板７３の外側辺７９が同径部１１の内周面１１ｃにほぼ当接するものである。なお、内ガイド板７３の枚数は3枚以上であって、外側辺７９が同径部１１の内周
面１１ｃの内径とほぼ同一の円周面を形成し、外側辺７９が内周面１１ｃにほぼ当接するように設置される。 Then, when the main body portion 18 is covered with the cylindrical body 60 and the abutting portion 61 abuts on the stepped portion 12 of the inner joint pipe 10, the outer side 79 of the inner guide plate 73 is brought into contact with the inner peripheral surface 11 c of the same diameter portion 11. It almost touches. The number of the inner guide plates 73 is three or more, the outer side 79 forms a circumferential surface substantially the same as the inner diameter of the inner peripheral surface 11c of the same diameter portion 11, and the outer side 79 is the inner peripheral surface 11c. It is installed so that it may almost contact | abut.

よって、施工用保護治具６は、内ガイド板７３によって同径部１１の内周面１１ｃに対して案内されて、筒体６０の当接部６１が内側継手管１０の段部１２に載置されるから、内側継手管１０に対して容易に傾いたり半径方向に移動したりすることがない。この状態で、貫通孔６４ａにボルト３０（図示せず）を挿入してネジ孔１９ａに螺合すれば、内側継手管１０と施工用保護治具６とは確実に接合され、内側継手管１０に対して円周方向にも拘束される。   Therefore, the construction protection jig 6 is guided by the inner guide plate 73 with respect to the inner peripheral surface 11 c of the same diameter portion 11, and the contact portion 61 of the cylindrical body 60 is placed on the step portion 12 of the inner joint pipe 10. Therefore, it does not easily tilt with respect to the inner joint pipe 10 or move in the radial direction. In this state, if the bolt 30 (not shown) is inserted into the through hole 64a and screwed into the screw hole 19a, the inner joint pipe 10 and the construction protection jig 6 are reliably joined, and the inner joint pipe 10 However, it is also restrained in the circumferential direction.

打撃ハンマによって鏡板７２を打撃すれば、鋼管１を埋設するための打撃力（即ち、圧縮力）は、施工用保護治具６の当接部６１を介して段部１２から内側継手管１０に伝達されることになる。この際、クッション７５があるので、打撃の衝撃力を緩和することができ、長期使用における施工用保護治具６の損傷を軽減できる。この時、本体部１８に圧縮力や曲げ力が作用しないから、本体部１８（特に、分割片１３とネジ孔１７）が変形することがない。   If the end plate 72 is struck with a hammer, the striking force (that is, the compressive force) for embedding the steel pipe 1 is transferred from the step portion 12 to the inner joint pipe 10 via the contact portion 61 of the construction protection jig 6. Will be communicated. At this time, since the cushion 75 is provided, the impact force of the impact can be reduced, and damage to the construction protection jig 6 during long-term use can be reduced. At this time, since the compressive force and the bending force do not act on the main body 18, the main body 18 (particularly, the split piece 13 and the screw hole 17) is not deformed.

なお、クッション７５が撤去されたクッション枠７４を、バイブロ用の把持具としてもよい。この場合は、引張力が、ボルト３０を介して貫通孔６４ａからネジ孔１９ａに付与されるが、上述した効果を同様に奏する。   The cushion frame 74 from which the cushion 75 has been removed may be used as a gripping tool for vibro. In this case, a tensile force is applied from the through hole 64a to the screw hole 19a via the bolt 30, but the above-described effects are similarly achieved.

一方、図３（ｂ）は、図３（ａ）の内ガイド板７３に代えて、筒状の内ガイド管７６を設置した場合である。本体部１８に筒体６０を被せて設置した際、当接部６１は内側継手管１０の段部１２に当接、内ガイド管７６の外周面は同径部１１の内周面１１ｃに当接するものである。この状態で、貫通孔６４ａにボルト３０（図示せず）を挿入してネジ孔１９ａに螺合する。従って、図３（ｂ）の場合も、図３（ａ）と同様の作用と効果を奏する。   On the other hand, FIG. 3B shows a case where a cylindrical inner guide tube 76 is installed instead of the inner guide plate 73 of FIG. When the main body 18 is installed with the cylindrical body 60 covered, the abutting portion 61 abuts on the stepped portion 12 of the inner joint tube 10, and the outer peripheral surface of the inner guide tube 76 contacts the inner peripheral surface 11 c of the same diameter portion 11. It touches. In this state, a bolt 30 (not shown) is inserted into the through hole 64a and screwed into the screw hole 19a. Therefore, also in the case of FIG.3 (b), there exists an effect | action and effect similar to Fig.3 (a).

なお、ここで「ほぼ当接」とは、文字通り、内周面１１ｃの内径と内ガイド板７３の外側辺７９が作る円周面の外径、もしくは、内周面１１ｃの内径とガイド管７６の外径が、同一であることに限定するものではなく、上述した施工用保護治具６を案内する機能を満足することができる程度の「隙間」を空けて、両者が対峙する場合を含むものである。   Here, “substantially contact” literally means the inner diameter of the inner peripheral surface 11 c and the outer diameter of the circumferential surface formed by the outer side 79 of the inner guide plate 73, or the inner diameter of the inner peripheral surface 11 c and the guide tube 76. The outer diameters of the two are not limited to be the same, and include a case where the two face each other with a “gap” that can satisfy the function of guiding the construction protection jig 6 described above. It is a waste.

なお、本実施の形態では、第１の実施の形態の別の例としたが、それに代えて、上述（４）で説明した第２の実施の形態の別の例としても良い。この時、引張力は、突部６４ｂと凹溝１９ｂにより、施工用保護治具６から内側継手管１０に伝達される。この場合も、第１の実施の形態の場合と同様の作用と効果を奏する。   In the present embodiment, another example of the first embodiment is used. Instead, another example of the second embodiment described in the above (4) may be used. At this time, the tensile force is transmitted from the construction protection jig 6 to the inner joint pipe 10 by the protrusion 64b and the concave groove 19b. Also in this case, the same operations and effects as in the case of the first embodiment are obtained.

（６）施工用保護治具の例：第４の実施の形態
上述した第２の実施の形態の別の例を、第４の実施の形態として説明する。図４に、第４の実施の形態に係る施工用保護治具を、内側継手管に被せた例で模式的に示す。向かって左側が縦断面図、右側が側面図である。用いた内側継手管は、図１５を用いて上記（１）で説明した分割片１３を有した内側継手管１０と、基本的に同一の構造であり、図１５と同一の部分は同一の符号により示し、詳細な説明は省略する。また、第４の実施の形態に係る施工用保護治具についても、図２と同一の部分は同一の符号により示し、詳細な説明は省略する。 (6) Example of construction protection jig: Fourth embodiment Another example of the above-described second embodiment will be described as a fourth embodiment. FIG. 4 schematically shows the construction protection jig according to the fourth embodiment as an example of covering the inner joint pipe. The left side is a longitudinal sectional view, and the right side is a side view. The inner joint pipe used has basically the same structure as the inner joint pipe 10 having the divided pieces 13 described in (1) above with reference to FIG. 15, and the same parts as those in FIG. Detailed description will be omitted. Moreover, also about the construction protection jig which concerns on 4th Embodiment, the part same as FIG. 2 is shown with the same code | symbol, and detailed description is abbreviate | omitted.

本実施の形態においては、筒体６０の内壁面で、かつ分割片１３の先端部に対向する領域に張り出し部６９を設けた。張り出し部６９における内径は、内側継手管１０の分割片１３の先端部の外径とほぼ同じで、かつ本体部１８の最大外径よりも小さい。その為、図４に示した内側継手管１０に施工用保護治具６を被せた状態で、この張り出し部６９の内壁面が、内側継手管１０の分割片１３の先端部にほぼ当設するようになっている。   In the present embodiment, the overhanging portion 69 is provided on the inner wall surface of the cylindrical body 60 and in a region facing the tip of the divided piece 13. The inner diameter of the overhanging portion 69 is substantially the same as the outer diameter of the distal end portion of the split piece 13 of the inner joint pipe 10 and is smaller than the maximum outer diameter of the main body portion 18. For this reason, the inner wall surface of the overhanging portion 69 substantially contacts the tip of the split piece 13 of the inner joint pipe 10 in a state where the inner joint pipe 10 shown in FIG. It is like that.

当接部６１と段部１２に圧縮力が作用すると、分割片１３の先端部には、段部１２を軸とした内側継手管１０の先端部が拡径する方向にモーメントが発生し、分割片１３の先端部は、外側に張り出すように僅かであるが移動する。そこで本実施の形態によれば、上記（４）にて述べた第２の実施の形態の効果に加え、初めからほぼ当接している状態にあることで、施工中に分割片１３が外側に張り出して、施工用保護治具６の内壁面に当たって破損することを防ぐことができる。   When a compressive force is applied to the contact portion 61 and the step portion 12, a moment is generated at the distal end portion of the split piece 13 in the direction in which the distal end portion of the inner joint pipe 10 having the step portion 12 as an axis expands. The tip end of the piece 13 moves slightly so as to project outward. Therefore, according to the present embodiment, in addition to the effect of the second embodiment described in the above (4), the divided piece 13 is placed outside during construction because it is in a state of being substantially in contact from the beginning. It can be prevented from overhanging and hitting the inner wall surface of the protective jig 6 for construction.

なお、ほぼ当接とは、文字通り張り出し部６９の内壁面と分割片１３の先端部とが接触している状態（もしくは、張り出し部６９の内径と分割片１３の先端の外径とが同一である状態）に限定するものではなく、施工用保護治具６を内側継手管１０に被せ、当接部６１が段部１２に当設した際に、少量の「隙間」を空けて両者が対峙するものを含むものである。但し、例えば、施工の際の分割片１３の外側への撓み量を少なくする為にも、上記「隙間」は最小であることが、より好ましい。   The term “substantially contact” literally means that the inner wall surface of the overhanging portion 69 is in contact with the tip of the segment 13 (or the inner diameter of the overhang 69 and the outer diameter of the tip of the segment 13 are the same. It is not limited to a certain state). When the construction protection jig 6 is placed on the inner joint pipe 10 and the contact portion 61 is placed on the stepped portion 12, a small amount of “gap” is formed to confront each other. Including what to do. However, for example, in order to reduce the amount of bending outward of the divided piece 13 during construction, it is more preferable that the “gap” is minimum.

（７）施工用保護治具の例：第５の実施の形態
上述した第４の実施の形態の別の例を、第５の実施の形態として説明する。図５に、第５の実施の形態に係る施工用保護治具を、内側継手管に被せた例で模式的に示す。向かって左側が縦断面図、右側が側面図である。用いた内側継手管は、図１５を用いて上記（１）で説明した分割片１３を有した内側継手管１０と、基本的に同一の構造であり、図１５と同一の部分は同一の符号により示し、詳細な説明は省略する。また、第５の実施の形態に係る施工用保護治具についても、図４と同一の部分は同一の符号により示し、詳細な説明は省略する。 (7) Example of protective jig for construction: Fifth embodiment Another example of the above-described fourth embodiment will be described as a fifth embodiment. FIG. 5 schematically shows the construction protection jig according to the fifth embodiment as an example of covering the inner joint pipe. The left side is a longitudinal sectional view, and the right side is a side view. The inner joint pipe used has basically the same structure as the inner joint pipe 10 having the divided pieces 13 described in (1) above with reference to FIG. 15, and the same parts as those in FIG. Detailed description will be omitted. Moreover, also about the construction protection jig which concerns on 5th Embodiment, the part same as FIG. 4 is shown with the same code | symbol, and detailed description is abbreviate | omitted.

本実施の形態においては、施工用保護治具６の分割片６６に貫通孔６５ａと鋼管１にネジ孔１９ｃを設ける代わりに、分割片６６の外周面にボルト支持台６５ｂを設けた。このボルト支持台６５ｂは、施工用保護治具６のスリット６７を挟んだ、分割片６６の端部の位置に、2個1組で設けられ、ほぼ中心には、ボルト軸を通す為の貫通孔が開けられている。ボルト支持台６５ｂは金属製で、施工用保護治具６とは溶接にて固定されている。   In this embodiment, instead of providing the through-hole 65a and the screw hole 19c in the steel pipe 1 in the divided piece 66 of the construction protection jig 6, a bolt support 65b is provided on the outer peripheral surface of the divided piece 66. The bolt support 65b is provided as a pair at the end of the split piece 66 with the slit 67 of the construction protection jig 6 interposed therebetween, and is almost completely penetrated through the bolt shaft. A hole has been drilled. The bolt support 65b is made of metal and is fixed to the construction protection jig 6 by welding.

図５に示すように、スリット６７を挟んで組になっているボルト支持台６５ｂの貫通孔にボルト３０の軸を通し、ボルト頭のあるボルト支持台６５ｂと対向する位置にあるボルト支持台６５ｂの方からナット３１で留める。この状態で、スリット６７の幅を縮めるようにボルト３０とナット３１で締め付けると、分割片６６は内側に撓む。すると、施工用保護治具６の下端部が縮径して鋼管１（または内側継手管１０）と密着し、施工用保護治具６と鋼管１（または内側継手管１０）とは一体化する。この機構により、施工用保護治具６の突起６４ｂと内側継手管１０の凹溝とが確実に嵌合すると共に、打撃時のリバウンド等により、施工用保護治具６が落下する危険が無くなる。また、施工用保護治具６の縮径した下端部の内周面と鋼管１（または内側継手管１０）の外周面との当接部分で、施工用保護治具６の円周方向に対する摩擦力が発生する為、施工用保護治具６の円周方向の回転も抑制することができる。   As shown in FIG. 5, the bolt support base 65 b is located at a position facing the bolt support base 65 b with the bolt head through the shaft of the bolt 30 through the through hole of the bolt support base 65 b assembled with the slit 67 interposed therebetween. Fasten with nut 31 from the side. In this state, when the bolts 30 and the nuts 31 are tightened so as to reduce the width of the slit 67, the split piece 66 bends inward. Then, the lower end portion of the construction protection jig 6 is reduced in diameter and comes into close contact with the steel pipe 1 (or the inner joint pipe 10), and the construction protection jig 6 and the steel pipe 1 (or the inner joint pipe 10) are integrated. . With this mechanism, the protrusion 64b of the construction protection jig 6 and the concave groove of the inner joint pipe 10 are securely fitted, and the danger of dropping the construction protection jig 6 due to rebound at the time of impact is eliminated. Further, the friction with respect to the circumferential direction of the construction protection jig 6 at the contact portion between the inner peripheral surface of the lower end portion of the reduced diameter of the construction protection jig 6 and the outer peripheral surface of the steel pipe 1 (or the inner joint pipe 10). Since force is generated, rotation of the construction protection jig 6 in the circumferential direction can also be suppressed.

なお、本実施の形態においては、ナット３１で留める側のボルト支持台６５ｂに、ナット３１を溶接により取付けてもよい。   In the present embodiment, the nut 31 may be attached to the bolt support 65b on the side fastened with the nut 31 by welding.

本実施の形態によれば、上記（４）にて述べた第２の実施の形態の効果と、上記（６）にて述べた第４の実施の形態の効果に加え、以下の効果がある。先ず、内側継手管１０の同径部１１、もしくは鋼管１にネジ孔１９ａ、１９ｃを開けなくて良いので、内側継手管１０と鋼管１の耐力の低下が全く無く、加工コストも発生しない。一方、施工用保護治具６に、ボルト支持台６５ｂを取り付けるコストが発生するが、従来技術で十分対応できる上、厳密な寸法精度も要求されない（上述したように、ボルト３０とナット３１で締め付けて分割片６６が内側に撓めば、機能としては満足されている）ので、コスト上大きな負担にはならない。また、従来から行われているボルトとナットの締め付けで施工が済むので、施工コストも殆ど上昇しない。   According to the present embodiment, in addition to the effects of the second embodiment described in the above (4) and the effects of the fourth embodiment described in the above (6), there are the following effects. . First, since it is not necessary to open the screw holes 19a and 19c in the same-diameter portion 11 of the inner joint pipe 10 or the steel pipe 1, there is no decrease in the proof stress of the inner joint pipe 10 and the steel pipe 1, and no processing cost is generated. On the other hand, although the cost of attaching the bolt support 65b to the construction protection jig 6 is incurred, it can be adequately handled by the conventional technology and does not require strict dimensional accuracy (as described above, tightened with the bolt 30 and the nut 31). If the split piece 66 bends inward, the function is satisfied. In addition, since construction is completed by tightening bolts and nuts that have been conventionally performed, the construction cost hardly increases.

（８）施工用保護治具の例：第６の実施の形態
上述した第４の実施の形態の別の例を、第６の実施の形態として説明する。図６（ａ）に、第６の実施の形態に係る施工用保護治具を、内側継手管に被せた例で模式的に示す。向かって左側が縦断面図、右側が側面図である。用いた内側継手管は、図１５を用いて上記（１）で説明した分割片１３を有した内側継手管１０と、基本的に同一の構造であり、図１５と同一の部分は同一の符号により示し、詳細な説明は省略する。また、第６の実施の形態に係る施工用保護治具についても、図４と同一の部分は同一の符号により示し、詳細な説明は省略する。 (8) Example of protective jig for construction: Sixth embodiment Another example of the above-described fourth embodiment will be described as a sixth embodiment. FIG. 6A schematically shows an example in which the construction protection jig according to the sixth embodiment is put on the inner joint pipe. The left side is a longitudinal sectional view, and the right side is a side view. The inner joint pipe used has basically the same structure as the inner joint pipe 10 having the divided pieces 13 described in (1) above with reference to FIG. 15, and the same parts as those in FIG. Detailed description will be omitted. Moreover, also about the construction protection jig which concerns on 6th Embodiment, the part same as FIG. 4 is shown with the same code | symbol, and detailed description is abbreviate | omitted.

本実施の形態においては、施工用保護治具６の分割片６６に貫通孔６５ａと鋼管１にネジ孔１９ｃを設ける代わりに、分割片６６の外周面を覆う締結用バンド６５ｃを設けた。   In the present embodiment, instead of providing the through-hole 65a and the screw hole 19c in the split piece 66 of the construction protection jig 6, the fastening band 65c that covers the outer peripheral surface of the split piece 66 is provided.

締結用バンド６５ｃは、施工用保護治具６の取り付ける箇所の外径よりも短い長さの金属製のバンド６５ｅからなり、バンド６５ｅの長手方向（即ち、取り付けた際には施工用保護治具６の円周方向）の両端に、それぞれボルト支持台６５ｄが、設けられている。2
個のボルト支持台６５ｄは、そのほぼ中心に、ボルト軸を通す為の貫通孔が開けられており、ベルト６５ｅとは溶接にて固定されている。 The fastening band 65c is made of a metal band 65e having a length shorter than the outer diameter of the portion to which the construction protection jig 6 is attached, and the longitudinal direction of the band 65e (that is, the construction protection jig when attached) 6 are provided at both ends in the circumferential direction 6). 2
The bolt support base 65d is provided with a through-hole for passing the bolt shaft at substantially the center thereof, and is fixed to the belt 65e by welding.

図６に示すように、この締結用バンド６５ｃを、施工用保護治具６の分割片６６とスリット６７のある領域に巻くと、2個のボルト支持台６５ｄの間に隙間ができる。この隙間を渡すように、2個のボルト支持台６５ｄの貫通孔にボルト３０の軸を通し、ボルト３０の頭と反対側のボルト支持台６５ｄからナット３１で留める。この状態で、締結用バンド６５ｃの内径を縮めるようにボルト３０とナット３１で締め付けると、分割片６６は内側に撓む。すると、施工用保護治具６の下端部が縮径して鋼管１（または内側継手管１０）と密着し、施工用保護治具６と鋼管１（または内側継手管１０）とは一体化する。この機構により、施工用保護治具６の突起６４ｂと内側継手管１０の凹溝１９ｂとが確実に嵌合すると共に、打撃時のリバウンド等により、施工用保護治具６が落下する危険が無くなる。また、施工用保護治具６の縮径した下端部の内周面と鋼管１（または内側継手管１０）の外周面との当接部分で、施工用保護治具６の円周方向に対する摩擦力が発生する為、施工用保護治具６の円周方向の回転も抑制することができる。   As shown in FIG. 6, when this fastening band 65c is wound around an area having the split piece 66 and the slit 67 of the construction protection jig 6, a gap is formed between the two bolt support bases 65d. The shaft of the bolt 30 is passed through the through holes of the two bolt support bases 65d so as to pass this gap, and is fastened with the nut 31 from the bolt support base 65d opposite to the head of the bolt 30. In this state, when the bolt 30 and the nut 31 are tightened so as to reduce the inner diameter of the fastening band 65c, the split piece 66 bends inward. Then, the lower end portion of the construction protection jig 6 is reduced in diameter and comes into close contact with the steel pipe 1 (or the inner joint pipe 10), and the construction protection jig 6 and the steel pipe 1 (or the inner joint pipe 10) are integrated. . By this mechanism, the protrusion 64b of the construction protection jig 6 and the concave groove 19b of the inner joint pipe 10 are securely fitted, and the danger of the construction protection jig 6 falling due to rebound at the time of impact is eliminated. . Further, the friction with respect to the circumferential direction of the construction protection jig 6 at the contact portion between the inner peripheral surface of the lower end portion of the reduced diameter of the construction protection jig 6 and the outer peripheral surface of the steel pipe 1 (or the inner joint pipe 10). Since force is generated, rotation of the construction protection jig 6 in the circumferential direction can also be suppressed.

なお、本実施の形態においては、ナット３１で留める側のボルト支持台６５ｄに、ナット３１を溶接により取付けてもよい。   In the present embodiment, the nut 31 may be attached to the bolt support 65d on the side to be fastened with the nut 31 by welding.

また、図６（ａ）には、バンド６５ｅが1本の場合を示したが、複数本で構成されていても良い。2本の場合の上面図を図６（ｂ）に、3本の場合の上面図を図６（ｃ）に示す。施工用保護治具６の径や板厚、バンド６５ｅの板厚、締結用バンド６５ｃ用金属の材質、加工コスト、もしくは施工の容易さ等を考慮して、適宜選択すれば良い。   Further, FIG. 6A shows a case where the number of bands 65e is one, but a plurality of bands 65e may be used. FIG. 6B shows a top view in the case of two, and FIG. 6C shows a top view in the case of three. What is necessary is just to select suitably in consideration of the diameter and board thickness of the protection jig 6 for construction, the board thickness of the band 65e, the material of the metal for the fastening band 65c, the processing cost, the ease of construction, and the like.

本実施の形態によれば、上記（４）にて述べた第２の実施の形態の効果と、上記（６）にて述べた第４の実施の形態との効果に加え、以下の効果がある。先ず、内側継手管１０の同径部１１、もしくは鋼管１にネジ孔１９ａ、１９ｃを開けなくて良いので、内側継手管１０と鋼管１の耐力の低下が全く無く、加工コストも発生しない。一方、締結用バンド６５ｃの製作コストが発生するが、従来技術で十分対応できる上、厳密な寸法精度も要求されない（上述したように、ボルト３０とナット３１で締結用バンド６５ｃの内径を縮めて、分割片６６が内側に撓めば、機能としては十分である。）ので、コスト上大きな負担にはならない。また、従来から行われているボルトとナットの締め付けで施工が済むので、施工コストも殆ど上昇しない。   According to the present embodiment, in addition to the effects of the second embodiment described in the above (4) and the effects of the fourth embodiment described in the above (6), the following effects are obtained. is there. First, since it is not necessary to open the screw holes 19a and 19c in the same-diameter portion 11 of the inner joint pipe 10 or the steel pipe 1, there is no decrease in the proof stress of the inner joint pipe 10 and the steel pipe 1, and no processing cost is generated. On the other hand, although the manufacturing cost of the fastening band 65c is generated, it can be adequately handled by the conventional technique and does not require strict dimensional accuracy (as described above, the inner diameter of the fastening band 65c is reduced by the bolt 30 and the nut 31). If the split piece 66 bends inward, the function is sufficient.) Therefore, there is no significant burden on the cost. In addition, since construction is completed by tightening bolts and nuts that have been conventionally performed, the construction cost hardly increases.

（９）施工用保護治具の例：第７の実施の形態
施工用保護治具の別の例について、第７の実施の形態として説明する。図７に、第７の実施の形態に係る施工用保護治具を、内側継手管に被せた例で模式的に示す。向かって左側が縦断面図、右側が側面図である。用いた内側継手管は、図１５を用いて上記（１）で説明した分割片１３を有した内側継手管１０と、基本的に同一の構造であり、図１５と同一の部分は同一の符号により示し、詳細な説明は省略する。また、第７の実施の形態に係る施工用保護治具についても、図１と同一の部分は同一の符号により示し、詳細な説明は省略する。 (9) Example of Construction Protective Jig: Seventh Embodiment Another example of the construction protective jig will be described as a seventh embodiment. FIG. 7 schematically shows the construction protection jig according to the seventh embodiment as an example of covering the inner joint pipe. The left side is a longitudinal sectional view, and the right side is a side view. The inner joint pipe used has basically the same structure as the inner joint pipe 10 having the divided pieces 13 described in (1) above with reference to FIG. 15, and the same parts as those in FIG. Detailed description will be omitted. Moreover, also about the construction protection jig which concerns on 7th Embodiment, the part same as FIG. 1 is shown with the same code | symbol, and detailed description is abbreviate | omitted.

図７において、鋼管１に接合された内側継手管１０は、高さｈ１１の同径部１１、高さｈ１１ａの肉厚部１１ａ、段部１２、高さｈ１８の本体部１８、分割片１３、スリット１４、分割片１３の外周面に設けられた係合突部１６、およびネジ孔１７を有している。   In FIG. 7, the inner joint pipe 10 joined to the steel pipe 1 has the same diameter part 11 of height h11, the thick part 11a of height h11a, the step part 12, the main body part 18 of height h18, the divided piece 13, It has a slit 14, an engagement protrusion 16 provided on the outer peripheral surface of the divided piece 13, and a screw hole 17.

一方、施工用保護治具６は、内側継手管１０の本体部１８の高さｈ１８と肉厚部１１ａの高さｈ１１ａとの和、即ちｈ１８＋ｈ１１ａ、よりも高い高さｈ６０の筒体６０と、上端部６２とからなる。筒体６０の内壁面には、当接部６１が設けられている。また、上端部６２として、つかみ代６２ａが設けられている。さらに、筒体６０の下端部には、分割片６６と複数のスリット６７が設けられており、筒体６０の下端部を拡径させ、内側継手管１０への装着を容易にする。   On the other hand, the construction protection jig 6 includes a cylindrical body 60 having a height h60 higher than the sum of the height h18 of the main body portion 18 of the inner joint pipe 10 and the height h11a of the thick portion 11a, that is, h18 + h11a, It consists of an upper end 62. A contact portion 61 is provided on the inner wall surface of the cylindrical body 60. Further, as the upper end portion 62, a grip allowance 62a is provided. Furthermore, a split piece 66 and a plurality of slits 67 are provided at the lower end portion of the cylindrical body 60, and the diameter of the lower end portion of the cylindrical body 60 is increased to facilitate attachment to the inner joint pipe 10.

本実施の形態においては、つかみ代６２ａを通じて上端部６２に与えられた引張力を内側継手管１０に伝達する引張力伝達手段として、分割片１３の外周面に設けられた係合突部１６に嵌合するキー８１が用いられている。筒体６０の内壁面で係合突部１６に対向する複数の個所（例えば、筒体６０内壁面の周方向に４個所）に、それぞれキー８１を収納するキー溝８２が設けられており、筒体６０には、キー溝８２内に収納されているキー８１を係合突部１６に嵌合させて固定するキー設置手段８３が設けられている。   In the present embodiment, the engagement protrusion 16 provided on the outer peripheral surface of the split piece 13 is used as a tensile force transmitting means for transmitting the tensile force applied to the upper end 62 through the gripping margin 62 a to the inner joint pipe 10. A key 81 to be fitted is used. Key grooves 82 for storing the keys 81 are provided at a plurality of locations (for example, four locations in the circumferential direction of the inner wall surface of the cylindrical body 60) facing the engagement protrusions 16 on the inner wall surface of the cylindrical body 60, The cylindrical body 60 is provided with key installation means 83 for fitting and fixing the key 81 housed in the key groove 82 to the engagement protrusion 16.

そして、キー設置手段８３は、筒体６０を横に倒した状態で図８に示すように、キー溝８２から筒体６０の外壁面に貫通する貫通孔（ネジ山は無し）８４と、貫通したネジ孔８５ａを有し、その貫通ネジ孔８５ａが貫通孔８４に直結するように筒体６０の外壁面に取り付けられたキー設置用ボックス８５と、軸が貫通ネジ孔８５ａと貫通孔８４に装入され、軸の先端がキー８１に固定された六角ボルト８６と、キー設置用ボックス８のネジ孔８５ａに螺合されて、六角ボルト８６の頂部に当接する六角穴付きプラグ８７と、六角ボルト８６の首下部と筒体６０の外壁面の間に設置されたコイルバネ８８とから構成されている。   Then, as shown in FIG. 8, the key installation means 83 has a through-hole (no thread) 84 penetrating from the key groove 82 to the outer wall surface of the cylinder 60 with the cylinder 60 tilted sideways, A key installation box 85 attached to the outer wall surface of the cylindrical body 60 so that the through screw hole 85a is directly connected to the through hole 84, and the shaft is connected to the through screw hole 85a and the through hole 84. A hexagon bolt 86 inserted and the tip of the shaft fixed to the key 81, a hexagon socket plug 87 that is screwed into the screw hole 85 a of the key installation box 8 and contacts the top of the hexagon bolt 86, and a hexagon The coil spring 88 is installed between the lower neck portion of the bolt 86 and the outer wall surface of the cylindrical body 60.

そして、このような施工用保護治具６を内側継手管１０に接合する場合は、まず、図８（ａ）に示すように、キー８１をキー溝８２内に収納し、その状態で筒体６０を内側継手管１０に装着する（初期状態）。次に、図８（ｂ）に示すように、六角レンチ（図示せず）等を用いて六角穴付きプラグ８７を回転させて締め込み、それによって六角ボルト８６を押し下げて、キー８１を係合突部１６に嵌合させ、その状態で保持・固定する。これによって、キー８１を介して施工用保護治具６と内側継手管１０が連結・一体化する（合体状態）。   And when joining such a construction protection jig 6 to the inner joint pipe 10, first, as shown in FIG. 8 (a), the key 81 is housed in the key groove 82, and in this state the cylinder body 60 is attached to the inner joint pipe 10 (initial state). Next, as shown in FIG. 8B, the hexagon socket plug 87 is rotated and tightened using a hexagon wrench (not shown) or the like, and thereby the hexagon bolt 86 is pushed down to engage the key 81. It fits into the protrusion 16 and is held and fixed in that state. As a result, the construction protection jig 6 and the inner joint pipe 10 are connected and integrated via the key 81 (in a combined state).

ちなみに、上記において、六角穴付きプラグ８７を回転させて締め込む際は、六角穴付きプラグ８７が六角ボルト８６に当接しているだけなので、六角ボルト８６とキー８１は回転しない。したがって、キー８１が係合突部１６に向かって姿勢を保ったまま降りていき、係合突部１６に的確に嵌合することができる。また、施工中にキー８１および六角ボルト８６が振動などによりガタ付いたとしても、回転方向の力は六角穴付きプラグ８７には伝わらないため、六角穴付きプラグ８７が緩むことはなく、キー８１の逸脱は生じない。   Incidentally, in the above description, when the hexagon socket plug 87 is rotated and tightened, the hexagon socket plug 86 and the key 81 do not rotate because the hexagon socket plug 87 is only in contact with the hexagon bolt 86. Therefore, the key 81 descends while maintaining the posture toward the engaging protrusion 16, and can be accurately fitted to the engaging protrusion 16. Further, even if the key 81 and the hexagon bolt 86 are loose due to vibration during construction, the force in the rotating direction is not transmitted to the hexagon socket plug 87, so the hexagon socket plug 87 does not loosen. There is no deviation.

なお、内側継手管１０先端の分割片１３は可撓性を有しているので、キー８１が係合突部１６に嵌合した際に、分割片１３が内側に撓んで内側継手管１０の先端が縮径することを防止するために、分割片１３の撓みを拘束する縮径拘束部材８９を筒体６０の内壁面に取り付けている。これによって、係合突部１６にキー８１を強く押し付けても内側継手管１０の先端が縮径することがなく、施工用保護治具６に与えられた引張力をキー８１が内側継手管１０に確実に伝達することとなる。   Since the split piece 13 at the tip of the inner joint pipe 10 has flexibility, when the key 81 is fitted into the engagement protrusion 16, the split piece 13 bends inward and the inner joint pipe 10 In order to prevent the tip from being reduced in diameter, a reduced diameter restricting member 89 that restricts the bending of the divided piece 13 is attached to the inner wall surface of the cylindrical body 60. As a result, even if the key 81 is strongly pressed against the engaging protrusion 16, the tip of the inner joint pipe 10 is not reduced in diameter, and the key 81 applies the tensile force applied to the construction protection jig 6. Will be transmitted reliably.

本実施の形態によれば、例えば、鋼管１を地中に埋設する場合にバイブロハンマから与えられる圧縮力は、図８（ｃ）に示すように、まず、施工用保護治具６の筒体６０の上端部６２（より正確にはつかみ代６２ａ）に付与され、そして、筒体６０の当接部６１から内側継手管１０の段部１２へ伝達されるので、分割片１３とネジ孔１７に圧縮力が作用せず、分割片１３が変形（座屈等）したりネジ孔１７が破損することはない。また、キー８１を介して一体化されているので、打撃時のリバウンド等により、施工用保護治具６が落下する危険もない。同時に、施工用保護治具６が円周方向に回転してしまうことも無い。   According to the present embodiment, for example, when the steel pipe 1 is buried in the ground, the compressive force applied from the vibro hammer is first, as shown in FIG. Is provided to the upper end portion 62 (more precisely, the gripping allowance 62a), and is transmitted from the contact portion 61 of the cylindrical body 60 to the step portion 12 of the inner joint pipe 10. The compressive force does not act, and the split piece 13 is not deformed (buckled or the like) or the screw hole 17 is not damaged. Moreover, since it is integrated via the key 81, there is no danger that the construction protection jig 6 will drop due to rebounding at the time of impact. At the same time, the construction protection jig 6 does not rotate in the circumferential direction.

一方、例えばバイブロハンマによる引張力といった、鋼管１を持ち上げる力は、図８（ｄ）に示すように、施工用保護治具６のキー溝８２の側面から、キー８１を介して、内側継手管１０の係合突部１６に伝達される。この為、分割片１３のネジ孔１７に引張力が作用せず、やはりネジ孔１７が破損することはない。   On the other hand, for example, a force for lifting the steel pipe 1 such as a tensile force by a vibro hammer is applied to the inner joint pipe 10 from the side surface of the key groove 82 of the construction protection jig 6 through the key 81 as shown in FIG. Is transmitted to the engaging projection 16. For this reason, a tensile force does not act on the screw hole 17 of the split piece 13, and the screw hole 17 is not damaged.

また、施工に際しては、施工用保護治具６が内側継手管１０に対して傾斜したり水平方向に移動したりすることがないから、内側継手管１０の損傷、例えば図１４（ａ）と（ｂ）に示した如く、分割片１３が内側や外側に倒れたり、もしくは、ある分割片１３は内側に、これと対角位置にある分割片１３は外側に向かって倒れたりすることがない。   Further, during construction, the construction protection jig 6 does not tilt or move in the horizontal direction with respect to the inner joint pipe 10, so that damage to the inner joint pipe 10, for example, FIG. As shown in b), the divided piece 13 does not fall inward or outward, or a certain divided piece 13 does not fall inward, and the divided piece 13 that is in a diagonal position with this does not fall outward.

さらに、六角穴付きプラグ８７を緩めることで、収縮していたコイルバネ８８の反力により、六角ボルト８６とキー８１が上昇して、キー８１と係合突部１６の嵌合が外れて、施工用保護治具６と内側継手管１０との接合は容易に解ける。よって、六角穴付きプラグ８７を緩めてキー８１と係合突部１６の嵌合を外した後、分割片６６を外側に撓めて拡径させて、施工用保護治具６を内側継手管１０から軸方向に引き抜けば、施工用保護治具６は容易に取り外すことができる。   Further, by loosening the hexagon socket plug 87, the hexagon bolt 86 and the key 81 are raised by the reaction force of the contracted coil spring 88, and the fitting between the key 81 and the engagement protrusion 16 is released. The protective jig 6 and the inner joint pipe 10 can be easily unbonded. Therefore, the hexagon socket plug 87 is loosened to disengage the key 81 and the engagement protrusion 16, and then the split piece 66 is bent outward to expand the diameter, and the construction protection jig 6 is connected to the inner joint pipe. If it pulls out from 10 to an axial direction, the protection jig 6 for construction can be removed easily.

なお、第１から第７の実施の形態において、筒体６０の外面に吊索が係止自在な係止手段（たとえば、孔付きフランジ）、または吊索に連結された吊り金具が螺合する吊具用ネジ孔を設け、当該吊索を巻き上げることによって、施工用保護治具６に接合された鋼管１を吊り上げてもよい。このとき、鋼管１に係止手段等を設ける必要がなくなる。   In the first to seventh embodiments, locking means (for example, a flange with a hole) that allows the suspension cable to be locked to the outer surface of the cylindrical body 60 or a suspension fitting connected to the suspension cable are screwed together. The steel pipe 1 joined to the construction protection jig 6 may be lifted by providing a screw hole for a lifting tool and winding up the suspension rope. At this time, it is not necessary to provide locking means or the like on the steel pipe 1.

なお、第１から第７の実施の形態において、内側継手管を上述（１）で説明した内側継手管１０としたが、それに代えて、上述（２）で説明した内側継手管５０としても良い。この時、分割片１３と本体部１８を本体部５２に、ネジ孔１７をネジ孔５５に、同径部１１を同径部５１に、肉厚部１１ａを肉厚部５１ａに、および段部１２を段部５４に読み替える。この場合も、内側継手管１０の場合と同様の作用と効果を奏する。   In the first to seventh embodiments, the inner joint pipe is the inner joint pipe 10 described in the above (1). Instead, the inner joint pipe 50 described in the above (2) may be used. . At this time, the divided piece 13 and the main body 18 are the main body 52, the screw hole 17 is the screw hole 55, the same diameter part 11 is the same diameter part 51, the thick part 11a is the thick part 51a, and the step part. 12 is read as the stepped portion 54. Also in this case, the same operation and effect as in the case of the inner joint pipe 10 are obtained.

（１０）鋼管の施工方法の例：第８の実施の形態
内側継手管１０、外側継手管２０、および施工用保持治具６の第２の実施の形態の組合せで、バイブロハンマ１０２を用いて施工する、本発明に係る鋼管を地中に埋設する施工方法の例を、第８の実施の形態として説明する。 (10) Example of construction method of steel pipe: Eighth embodiment Construction using vibro hammer 102 in combination of second embodiment of inner joint pipe 10, outer joint pipe 20, and construction holding jig 6. An example of a construction method for embedding a steel pipe according to the present invention in the ground will be described as an eighth embodiment.

接合対象である鋼管１および鋼管２の端部には、予め工場等において内側継手管１０と外側継手管２０が、それぞれ溶接により接合されており、これら鋼管１、２が工事現場に輸送されるものとする。また、施工用保持治具６も、予め工場などにおいて製作済みであり、施工用保持治具６が工事現場に輸送されるものとする。   The inner joint pipe 10 and the outer joint pipe 20 are joined to the ends of the steel pipe 1 and the steel pipe 2 to be joined in advance in a factory or the like, respectively, and these steel pipes 1 and 2 are transported to the construction site. Shall. In addition, it is assumed that the construction holding jig 6 has already been manufactured in a factory or the like, and the construction holding jig 6 is transported to the construction site.

図９は、鋼管を地中に埋設する施工方法の一例を説明する工程図である。図１０は、図９の施工方法を、（ａ）から（ｅ）までの順番を工程順として模式的に示した側面図である。具体的には、図１０に対応した以下の（ａ）から（ｅ）の順で施工が行われる。
（ａ）先ず、内側継手管１０が上端（埋設時に地表に近くなる方の端）に接合されている鋼管１を、地上に載置しておく。そして、施工用保護治具６の外周面に設けた係止手段（図示しない）にワイヤロープ１０１を連結して施工用保護治具６を吊り上げ、さらに水平方向に移動させて、施工用保護治具６を内側継手管１０に被せる。施工用保護治具６の貫通孔６５ａにボルト３０を挿入して、ボルト３０を内側継手管１０のネジ孔１９ｃに螺合し、施工用保護治具６と内側継手管を一体化させる（ステップＳ７１）。
（ｂ）次に、鋼管１を起立させて、かつ貫入位置に配置する（ステップＳ７２）。
（ｃ）その後、バイブロハンマ１０２でつかみ代６２ａを把持し、打撃力と引張力とを施工用保護治具６に加えることで、鋼管１を地中に貫入させる（ステップＳ７３）。
（ｄ）鋼管１が所定位置まで地中に貫入した時点で打撃と引張を停止し、ボルト３０を取り外して、施工用保護治具６と内側継手管１０との一体化を解く。そして、施工用保護治具６をワイヤロープ１０１によって引き上げ、施工用保護治具６を内側継手管１０から取り外す（ステップＳ７４）。
（ｅ）施工用保護治具６を内側継手管１０から取り外した後、鋼管２の下端に接合されている外側継手管２０を、鋼管１に接合されている内側継手管１０に差し込む。それから、貫通孔２５にボルト３０を挿入してネジ孔１７に螺合することで、外側継手管２０と内側継手管１０とを接合する。これにより、鋼管１と鋼管２とが接合される（ステップＳ７５）。 FIG. 9 is a process diagram illustrating an example of a construction method for embedding a steel pipe in the ground. FIG. 10 is a side view schematically showing the construction method of FIG. 9 with the order from (a) to (e) as the process order. Specifically, construction is performed in the following order (a) to (e) corresponding to FIG.
(A) First, the steel pipe 1 in which the inner joint pipe 10 is joined to the upper end (the end closer to the ground surface when buried) is placed on the ground. Then, the wire rope 101 is connected to a locking means (not shown) provided on the outer peripheral surface of the construction protection jig 6, the construction protection jig 6 is lifted, and further moved in the horizontal direction to protect the construction protection jig. The tool 6 is put on the inner joint pipe 10. The bolt 30 is inserted into the through hole 65a of the construction protection jig 6, the bolt 30 is screwed into the screw hole 19c of the inner joint pipe 10, and the construction protection jig 6 and the inner joint pipe are integrated (step) S71).
(B) Next, the steel pipe 1 is erected and disposed at the penetration position (step S72).
(C) Thereafter, the gripping allowance 62a is gripped by the vibratory hammer 102, and the striking force and the tensile force are applied to the construction protecting jig 6, thereby penetrating the steel pipe 1 into the ground (step S73).
(D) When the steel pipe 1 penetrates into the ground to a predetermined position, the impact and tension are stopped, the bolt 30 is removed, and the construction protection jig 6 and the inner joint pipe 10 are unintegrated. Then, the construction protection jig 6 is pulled up by the wire rope 101, and the construction protection jig 6 is removed from the inner joint pipe 10 (step S74).
(E) After removing the construction protection jig 6 from the inner joint pipe 10, the outer joint pipe 20 joined to the lower end of the steel pipe 2 is inserted into the inner joint pipe 10 joined to the steel pipe 1. Then, the outer joint pipe 20 and the inner joint pipe 10 are joined by inserting the bolt 30 into the through hole 25 and screwing it into the screw hole 17. Thereby, the steel pipe 1 and the steel pipe 2 are joined (step S75).

以上（ａ）から（ｅ）を繰り返して、所定の鋼管数を（もしくは所定の深さまで）埋設する。この時、図示はしていないが鋼管２の上端には内側継手管１０が設けられており、ステップＳ７１に従って施工用保護治具６を接合し、その後、連結された鋼管１と鋼管２とをステップＳ７３に従って地中に埋設する。   The steps (a) to (e) are repeated to embed a predetermined number of steel pipes (or to a predetermined depth). At this time, although not shown, an inner joint pipe 10 is provided at the upper end of the steel pipe 2, and the construction protection jig 6 is joined according to step S71, and then the connected steel pipe 1 and steel pipe 2 are joined together. Embed in the ground according to step S73.

本施工方法によれば、施工用保護治具６は内側継手管１０にネジ接合されるものではなく、ボルト３０等で固定される為、施工用保護治具６を回転したり、管軸を鉛直方向に起立させたりする必要がない。また、施工用保護治具６の装着と分離が共に、ボルト３０で済む為、作業が容易である。さらに、施工用保護治具６が内側継手管１０（特に分割片１３とネジ孔１７）の変形を防止している為に、外側継手管２０を取り付ける際には、内側継手管１０と外側継手管２０との接合は、容易かつ確実なものとなる。   According to this construction method, the construction protection jig 6 is not screwed to the inner joint pipe 10, but is fixed with the bolt 30 or the like. There is no need to stand vertically. In addition, the mounting and separation of the construction protection jig 6 can be done with the bolts 30, so that the work is easy. Furthermore, since the protective jig 6 for construction prevents deformation of the inner joint pipe 10 (particularly, the split piece 13 and the screw hole 17), when the outer joint pipe 20 is attached, the inner joint pipe 10 and the outer joint Joining to the tube 20 is easy and reliable.

（１１）鋼管の施工方法の例：第９の実施の形態
内側継手管１０、外側継手管２０、および第２の実施の形態に係る施工用保持治具６の別の例の組合せで、打撃ハンマ１０３によって施工する、本発明に係る鋼管を地中に埋設する施工方法の他の例を、第９の実施の形態として説明する。 (11) Example of Steel Pipe Construction Method: Ninth Embodiment Blowing with another example combination of the inner joint pipe 10, the outer joint pipe 20, and the construction holding jig 6 according to the second embodiment Another example of the construction method for embedding the steel pipe according to the present invention under construction with the hammer 103 will be described as a ninth embodiment.

接合対象である鋼管１および鋼管２の端部には、予め工場等において内側継手管１０と外側継手管２０が、それぞれ溶接により接合されており、これら鋼管１、２が工事現場に輸送されるものとする。また、施工用保持治具６も、予め工場などにおいて製作済みであり、施工用保持治具６が工事現場に輸送されるものとする。   The inner joint pipe 10 and the outer joint pipe 20 are joined to the ends of the steel pipe 1 and the steel pipe 2 to be joined in advance in a factory or the like, respectively, and these steel pipes 1 and 2 are transported to the construction site. Shall. In addition, it is assumed that the construction holding jig 6 has already been manufactured in a factory or the like, and the construction holding jig 6 is transported to the construction site.

ここで、施工用保持治具６は、つかみ代６２ａが無い物を使用する。その一例を、図１１に側面図として模式的に示す。向かって右側が側面図、左側が断面図を示している。筒体６０の上には、何も設けずにおき、筒体６０の先端面６２ｂを上端部６２として機能させる。施工時には、この先端面６２ｂを打撃ハンマ１０３で打撃する。その他の部分は、第２の実施の形態に係る施工用保護治具６と基本的に同一の構造で、図２と同一の部分は同一の符号により示す。   Here, the construction holding jig 6 is one having no gripping margin 62a. One example is schematically shown as a side view in FIG. The right side is a side view and the left side is a cross-sectional view. Nothing is provided on the cylindrical body 60, and the front end surface 62 b of the cylindrical body 60 functions as the upper end portion 62. At the time of construction, the front end surface 62 b is hit with a hitting hammer 103. The other parts have basically the same structure as the construction protection jig 6 according to the second embodiment, and the same parts as those in FIG.

なお、この図１１に示した物に代えて、施工用保持治具６の第３の実施の形態を用いても良い。鋼管１の径や打撃ハンマ１０３の大きさ、付与する打撃力の大きさ等に合わせて、適宜選択すれば良い。   In addition, it may replace with the thing shown in this FIG. 11, and you may use 3rd Embodiment of the holding jig 6 for construction. What is necessary is just to select suitably according to the diameter of the steel pipe 1, the magnitude | size of the hammer 103, the magnitude | size of the applied striking force, etc.

図１２は、鋼管を地中に埋設する施工方法の一例を説明する工程図である。図１３は、図１２の施工方法を、（ａ）から（ｅ）までの順番を工程順として模式的に示した側面図である。具体的には、図１３に対応した以下の（ａ）から（ｅ）の順で施工が行われる。（ａ）先ず、内側継手管１０が上端（埋設時に地表に近くなる方の端）に接合されている鋼管１を、地上に載置しておく。そして、施工用保護治具６の外周面に設けた係止手段（図示しない）にワイヤロープ１０１を連結して施工用保護治具６を吊り上げ、さらに水平方向に移動させて、施工用保護治具６を内側継手管１０に被せる。施工用保護治具６の貫通孔６５ａにボルト３０を挿入して、ボルト３０を内側継手管１０のネジ孔１９ｃに螺合し、施工用保護治具６と内側継手管を一体化させる（ステップＳ１０１）。
（ｂ）次に、鋼管１を起立させて、かつ貫入位置に配置する（ステップＳ１０２）。
（ｃ）その後、打撃ハンマ１０３で施工用保護治具６の先端面６２ｂを打撃し、打撃力を施工用保護治具６に加えることで、鋼管１を地中に貫入させる（ステップＳ１０３）。
（ｄ）鋼管１が所定位置まで地中に貫入した時点で打撃を停止し、ボルト３０を取り外して、施工用保護治具６と内側継手管１０との一体化を解く。そして、施工用保護治具６をワイヤロープ１０１によって引き上げ、施工用保護治具６を内側継手管１０から取り外す（ステップＳ１０４）。
（ｅ）施工用保護治具６を内側継手管１０から取り外した後、鋼管２の下端に接合されている外側継手管２０を、鋼管１に接合されている内側継手管１０に差し込む。それから、貫通孔２５にボルト３０を挿入してネジ孔１７に螺合することで、外側継手管２０と内側継手管１０とを接合する。これにより、鋼管１と鋼管２とが接合される（ステップＳ１０５）。 FIG. 12 is a process diagram illustrating an example of a construction method for embedding a steel pipe in the ground. FIG. 13 is a side view schematically showing the construction method of FIG. 12 with the order from (a) to (e) as the process order. Specifically, construction is performed in the following order (a) to (e) corresponding to FIG. (A) First, the steel pipe 1 in which the inner joint pipe 10 is joined to the upper end (the end closer to the ground surface when buried) is placed on the ground. Then, the wire rope 101 is connected to a locking means (not shown) provided on the outer peripheral surface of the construction protection jig 6, the construction protection jig 6 is lifted, and further moved in the horizontal direction to protect the construction protection jig. The tool 6 is put on the inner joint pipe 10. The bolt 30 is inserted into the through hole 65a of the construction protection jig 6, the bolt 30 is screwed into the screw hole 19c of the inner joint pipe 10, and the construction protection jig 6 and the inner joint pipe are integrated (step) S101).
(B) Next, the steel pipe 1 is erected and disposed at the penetration position (step S102).
(C) Then, the steel pipe 1 is penetrated into the ground by striking the front end surface 62b of the construction protection jig 6 with the hammering hammer 103 and applying a striking force to the construction protection jig 6 (step S103).
(D) When the steel pipe 1 penetrates into the ground to a predetermined position, the blow is stopped, the bolt 30 is removed, and the construction protection jig 6 and the inner joint pipe 10 are unintegrated. Then, the construction protection jig 6 is pulled up by the wire rope 101, and the construction protection jig 6 is removed from the inner joint pipe 10 (step S104).
(E) After removing the construction protection jig 6 from the inner joint pipe 10, the outer joint pipe 20 joined to the lower end of the steel pipe 2 is inserted into the inner joint pipe 10 joined to the steel pipe 1. Then, the outer joint pipe 20 and the inner joint pipe 10 are joined by inserting the bolt 30 into the through hole 25 and screwing it into the screw hole 17. Thereby, the steel pipe 1 and the steel pipe 2 are joined (step S105).

以上（ａ）から（ｅ）を繰り返して、所定の鋼管数を（もしくは所定の深さまで）埋設する。この時、図示はしていないが鋼管２の上端には内側継手管１０が設けられており、ステップＳ１０１に従って施工用保護治具６を接合し、その後、連結された鋼管１と鋼管２とをステップＳ１０３に従って地中に埋設する。   The steps (a) to (e) are repeated to embed a predetermined number of steel pipes (or to a predetermined depth). At this time, although not shown, an inner joint pipe 10 is provided at the upper end of the steel pipe 2, and the construction protection jig 6 is joined in accordance with step S101, and then the connected steel pipe 1 and steel pipe 2 are joined together. Embed in the ground according to step S103.

本施工方法によれば、上述の（１０）の施工方法の例：その１と同様に、施工用保護治具６は内側継手管１０にネジ接合されるものではないため、施工用保護治具６を回転したり、管軸を鉛直方向に起立させたりする必要がなくなる。また、施工用保護治具６の装着と分離が共に、ボルト３０で済む為、作業が容易である。さらに、施工用保護治具６が内側継手管１０（特に分割片１３とネジ孔１７）の変形を防止している為に、外側継手管２０を取り付ける際には、内側継手管１０と外側継手管２０との接合は、容易かつ確実なものとなる。   According to this construction method, since the construction protection jig 6 is not screw-bonded to the inner joint pipe 10 as in the first example of the construction method (10): Part 1, the construction protection jig There is no need to rotate 6 or erect the tube axis in the vertical direction. In addition, the mounting and separation of the construction protection jig 6 can be done with the bolts 30, so that the work is easy. Furthermore, since the protective jig 6 for construction prevents deformation of the inner joint pipe 10 (particularly, the split piece 13 and the screw hole 17), when the outer joint pipe 20 is attached, the inner joint pipe 10 and the outer joint Joining to the tube 20 is easy and reliable.

なお、施工方法の第８と第９の実施の形態共に、内側継手管を上述（１）で説明した内側継手管１０としたが、それに代えて、上述（２）で説明した内側継手管５０としても良い。この時、分割片１３と本体部１８を本体部５２に、ネジ孔１７をネジ孔５５に、同径部１１を同径部５１に、肉厚部１１ａを肉厚部５１ａに、段部１２を段部５４に、および係合突部１６を係合突起５３に読み替える。この場合も、内側継手管１０の場合と同様の作用と効果を奏する。   In both the eighth and ninth embodiments of the construction method, the inner joint pipe is the inner joint pipe 10 described in the above (1). Instead, the inner joint pipe 50 described in the above (2). It is also good. At this time, the divided piece 13 and the main body 18 are the main body 52, the screw hole 17 is the screw hole 55, the same diameter part 11 is the same diameter part 51, the thick part 11 a is the thick part 51 a, and the step part 12. Is replaced with the stepped portion 54, and the engaging protrusion 16 is replaced with the engaging protrusion 53. Also in this case, the same operation and effect as in the case of the inner joint pipe 10 are obtained.

本発明は、地面や地中に埋設される杭として用いられる鋼管に対してだけでなく、柱、杭柱兼用部材、梁、各種構造体の支持部材、もしくはパイルルーフ等の施工用支持部材等の用途の鋼管に対しても、広く使用することが可能である。   The present invention is not only for steel pipes used as piles embedded in the ground or in the ground, but also for pillars, pile pillar combined members, beams, support members for various structures, construction support members such as pile roofs, etc. It can also be used widely for steel pipes of the following purposes.

１、２ 鋼管
３、４ 継手構造
６ 施工用保護治具
１０ 内側継手管
１１ 同径部
１１ａ 肉厚部
１１ｃ 内周面
１２ 段部
１３ 分割片
１４ スリット
１６ 係合突部
１６ａ 係合突部下面
１６ｂ 係合突部傾斜面
１７ ネジ孔
１８ 本体部
１９ａ ネジ孔
１９ｂ 凹溝
１９ｃ ネジ孔
２０ 外側継手管
２１ 基端部
２１ａ 肉厚部
２３ 凹部
２４ 係止部
２５ 貫通孔
２６ 先端
３０ ボルト
４０ 外側継手管
４１ 基端部
４１ａ 肉厚部
４２ 段部
４３ 分割片
４４ スリット
４６ 係合突部
４６ａ 係合突部上面
４６ｂ 係合突部傾斜面
４７ 貫通孔
４８ 本体部
５０ 内側継手管
５１ 同径部
５１ａ 肉厚部
５２ 本体部
５３ 係止突起
５３ａ 係止部
５４ 段部
５５ ネジ孔
５６ 先端
６０ 筒体
６１ 当接部
６２ 上端部
６２ａ つかみ代
６２ｂ 先端面
６４ａ 貫通孔
６４ｂ 突起
６５ａ 貫通孔
６５ｂ ボルト支持台
６５ｃ 締結用バンド
６５ｄ ボルト支持台
６５ｅ バンド
６６ 分割片
６７ スリット
６９ 張り出し部
７２ 鏡板
７３ 内ガイド板
７４ クッション枠
７５ クッション
７６ 内ガイド管
７９ 外側辺
８１ キー
８２ キー溝
８３ キー設置手段
８４ 貫通孔
８５ キー設置用ボックス
８５ａ 貫通ネジ孔
８６ 六角ボルト
８７ 六角穴付きプラグ
８８ コイルバネ
８９ 縮径拘束部材
１０１ ワイヤロープ
１０２ バイブロハンマ
１０３ 打撃ハンマ
１１１ 鋼管
１１２ａ、１１２ｂ、１１２ｃ、１１２ｄ 分割片
１１３ 当接部材 DESCRIPTION OF SYMBOLS 1, 2 Steel pipe 3, 4 Joint structure 6 Construction protection jig 10 Inner joint pipe 11 Same diameter part 11a Thick part 11c Inner peripheral surface 12 Step part 13 Split piece 14 Slit 16 Engagement protrusion 16a Engagement protrusion lower surface 16b engagement protrusion inclined surface 17 screw hole 18 body part 19a screw hole 19b concave groove 19c screw hole 20 outer joint pipe 21 base end part 21a thick part 23 concave part 24 locking part 25 through hole 26 tip 30 bolt 40 outer joint Pipe 41 Base end part 41a Thick part 42 Step part 43 Split piece 44 Slit 46 Engagement protrusion 46a Engagement protrusion upper surface 46b Engagement protrusion inclined surface 47 Through-hole 48 Main body part 50 Inner joint pipe 51 Same diameter part 51a Thick part 52 Body part 53 Locking protrusion 53a Locking part 54 Step part 55 Screw hole 56 Tip 60 Cylindrical body 61 Abutting part 62 Upper end part 62a Grab margin 62b Tip face 64a Through Through hole 64b Protrusion 65a Through hole 65b Bolt support base 65c Fastening band 65d Bolt support base 65e Band 66 Split piece 67 Slit 69 Overhang part 72 End plate 73 Inner guide plate 74 Cushion frame 75 Cushion 76 Inner guide tube 79 Outer side 81 Key 82 Key groove 83 Key installation means 84 Through hole 85 Key installation box 85a Through screw hole 86 Hexagon bolt 87 Hexagon socket plug 88 Coil spring 89 Reduced diameter constraining member 101 Wire rope 102 Vibro hammer 103 Blow hammer 111 Steel pipe 112a, 112b, 112c, 112d Dividing piece 113 Contact member

Claims (7)

一方の端部が鋼管に接続されていて、圧縮力を前記鋼管に伝達するための段部と、前記鋼管と接続された端部から前記段部までの間に配置された、前記鋼管の板厚よりも板厚の厚い肉厚部と、を有し、外側継手管と対になって差込式継手構造を構成する内側継手管を備えた鋼管に対して使用する施工用保護治具であって、
前記内側継手管の鋼管とは接続されていない側の端部から前記段差までの高さと前記肉厚部の高さとの和よりも高い高さを有する筒体を備え、
前記筒体の内壁面には、前記内側継手管の段部に当接し、鋼管の施工時に与えられる打撃力を伝達するための当接部が設けられると共に、
前記筒体の内壁面には、外側継手管と係合して引張力を伝達するために前記内側継手管の外周面に設けられている係合部に嵌合するキーを収納するキー溝が設けられ、前記筒体には、前記キー溝内に収納されているキーを前記係合部に嵌合させて固定するキー設置手段が設けられていることを特徴とする、内側継手管を備えた鋼管の継手管の施工用保護治具。 A plate of the steel pipe, one end of which is connected to the steel pipe and arranged between the step for transmitting the compressive force to the steel pipe and the end connected to the steel pipe to the step. This is a construction protection jig used for steel pipes that have an inner joint pipe that forms a plug-in joint structure in pairs with the outer joint pipe. There,
A cylindrical body having a height higher than the sum of the height from the end on the side not connected to the steel pipe of the inner joint pipe to the step and the height of the thick part;
The inner wall surface of the cylindrical body is provided with an abutting portion for abutting the stepped portion of the inner joint pipe and transmitting a striking force applied when the steel pipe is constructed,
On the inner wall surface of the cylindrical body, there is a keyway for storing a key to be fitted to an engaging portion provided on the outer peripheral surface of the inner joint pipe in order to engage with the outer joint pipe and transmit a tensile force. Provided with an inner joint pipe, wherein the cylindrical body is provided with key installation means for fitting and fixing the key housed in the key groove to the engagement portion. Protective jig for construction of steel pipe joint pipes. 筒体の上部には、鋼管の施工時に打撃力もしくは引張力が付与される上端部が設けられていることを特徴とする、請求項１に記載の内側継手管を備えた鋼管の継手管の施工用保護治具。   The upper portion of the tubular body is provided with an upper end portion to which a striking force or a tensile force is applied during construction of the steel pipe, wherein the steel pipe joint pipe having the inner joint pipe according to claim 1 is provided. Protection jig for construction. 筒体の下端部には複数の分割片が設けられていることを特徴とする、請求項１または２に記載の内側継手管を備えた鋼管の施工用保護治具。   The steel pipe construction protection jig provided with the inner joint pipe according to claim 1, wherein a plurality of divided pieces are provided at a lower end portion of the cylindrical body. 内側継手管の内周面にほぼ当接するように配置されたガイド管を備えることを特徴とする、請求項１及至３の何れか１つに記載の内側継手管を備えた鋼管の施工用保護治具。   The construction protection of the steel pipe provided with the inner joint pipe according to any one of claims 1 to 3, further comprising a guide pipe disposed so as to substantially contact the inner peripheral surface of the inner joint pipe. jig. 内側継手管の内周面にほぼ当接するように配置された複数のガイド板を備えることを特徴とする、請求項１及至３の何れか１つに記載の内側継手管を備えた鋼管の施工用保護治具。   The construction of a steel pipe having an inner joint pipe according to any one of claims 1 to 3, comprising a plurality of guide plates arranged so as to substantially contact the inner peripheral surface of the inner joint pipe. Protection jig. 内側継手管を備えた鋼管を地中に埋設する施工方法であって、
請求項１及至５の何れか１つに記載の施工用保護治具を、前記内側継手管に装着する工程と、
その後、前記鋼管を埋設するための打撃力を、前記施工用保護治具に付与する工程と、を有することを特徴とする鋼管の施工方法。 A construction method in which a steel pipe with an inner joint pipe is buried in the ground,
Attaching the protective jig for construction according to any one of claims 1 to 5 to the inner joint pipe;
And a step of applying a striking force for embedding the steel pipe to the protective jig for construction. 内側継手管を備えた鋼管を地中に埋設する施工方法であって、
請求項１乃至５の何れか１つに記載の施工用保護治具を、キー溝内にキーが収納された状態で前記内側継手管に装着する工程と、
内側継手管に装着後、キー溝内に収納されているキーをキー設置手段によって前記内側継手管の係合部に嵌合させて固定する工程と、
キーを固定後、前記鋼管を埋設するための打撃力を、前記施工用保護治具に付与する工程と、を有することを特徴とする鋼管の施工方法。 A construction method in which a steel pipe with an inner joint pipe is buried in the ground,
A step of attaching the construction protection jig according to any one of claims 1 to 5 to the inner joint pipe in a state where the key is housed in the key groove,
After attaching to the inner joint pipe, a step of fitting and fixing the key stored in the key groove to the engagement portion of the inner joint pipe by the key installation means;
Applying a striking force for burying the steel pipe to the construction protection jig after fixing the key.
JP2012022611A 2006-07-27 2012-02-06 Protective jig for construction of steel pipe with inner joint pipe and construction method of steel pipe Expired - Fee Related JP5170331B2 (en)

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