JP2022097654A - Protective cap attachable/detachable to/from steel pipe pile and steel pipe sheet pile - Google Patents

Protective cap attachable/detachable to/from steel pipe pile and steel pipe sheet pile Download PDF

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JP2022097654A
JP2022097654A JP2022078246A JP2022078246A JP2022097654A JP 2022097654 A JP2022097654 A JP 2022097654A JP 2022078246 A JP2022078246 A JP 2022078246A JP 2022078246 A JP2022078246 A JP 2022078246A JP 2022097654 A JP2022097654 A JP 2022097654A
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key
retaining
main body
opening
protective cap
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JP7301197B2 (en
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明男 相和
Akio Sowa
慧 古田
Satoshi Furuta
浩之 山本
Hiroyuki Yamamoto
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Kubota Corp
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Kubota Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a protective cap having no possibility of breakage of an anti-loosening key.
SOLUTION: A protective cap includes a body part 41, and an anti-loosening key 5 that is arranged in a key groove composed of an inward groove part 44 of the body part 41 and an outward groove part 32 of a pin joint 3 and thereby connects the protective cap 4 and the pin joint 3 in an anti-loosening state, in which an opening 45 available when the anti-loosening key 5 is taken in/out from the key groove is provided in the body part 41, a key part 51 arranged in the key groove is provided in the anti-loosening key 5, a communication hole 13 communicating with the inward groove part 44 is provided in the body part 41, a collision preventive member 14 can be installed in the communication hole 13 so that a part thereof is positioned in at least the inward groove part 44, and the anti-loosening key 5 is prevented from moving to the depth of the key groove by bringing the key part 51 into contact with the part of the collision preventive member 14.
SELECTED DRAWING: Figure 9
COPYRIGHT: (C)2022,JPO&INPIT

Description

本発明は、鋼管の端部に振り分けて備えられたピン継手及びボックス継手によって、長手方向に連結可能に構成された鋼管杭・鋼管矢板の打ち込み施工時に、打ち込まれる鋼管杭・鋼管矢板に備えられた前記ピン継手に着脱可能な保護キャップに関する。 The present invention is provided for a steel pipe pile / steel pipe sheet pile to be driven at the time of driving a steel pipe pile / steel pipe sheet pile configured to be connectable in the longitudinal direction by a pin joint and a box joint separately provided at the end of the steel pipe. The present invention relates to a protective cap that can be attached to and detached from the pin joint.

従来、鋼管杭・鋼管矢板は施工現場に搬入された各単管を現地で溶接接合することによって連結されていた。近年、鋼管杭・鋼管矢板の連結には、溶接接合に替えて急速施工が可能な機械式継手が採用されている。 Conventionally, steel pipe piles and steel pipe sheet piles have been connected by welding and joining each single pipe brought to the construction site. In recent years, for connecting steel pipe piles and steel pipe sheet piles, mechanical joints that can be rapidly constructed have been adopted instead of welded joints.

この機械式継手は、特許文献1に開示されるように、鋼管の端部に振り分けて備えられたピン継手、ボックス継手及び荷重伝達キー等から構成されている。 As disclosed in Patent Document 1, this mechanical joint is composed of a pin joint, a box joint, a load transmission key, etc., which are separately provided at the end of a steel pipe.

ボックス継手は、その内周面に内向き溝部が設けられ、ピン継手は、ボックス継手に設けられた内向き溝部と相対する位置に、外向き溝部が設けられている。連結される二本の鋼管のうち一方の鋼管に溶接されたボックス継手に対して、他方の鋼管に溶接されたピン継手を挿入した後、荷重伝達キーを内向き溝部と外向き溝部とに跨るように配置することによって継手部材が一体化され二本の鋼管が連結されるように構成されている。 The box joint is provided with an inward groove portion on the inner peripheral surface thereof, and the pin joint is provided with an outward groove portion at a position facing the inward groove portion provided on the box joint. After inserting the pin joint welded to the other steel pipe into the box joint welded to one of the two steel pipes to be connected, the load transmission key straddles the inward groove portion and the outward groove portion. By arranging them in such a manner, the joint members are integrated and the two steel pipes are connected to each other.

鋼管杭・鋼管矢板は振動工法、回転工法、中掘り工法及びプレボーリング工法等によって打ち込み施工される。例えば振動工法においては、バイブロハンマによって振動を付与しつつ地盤に圧入することから、クレーンに吊設されたバイブロチャックで鋼管杭・鋼管矢板に設けられている機械式継手を直接把持すると、機械式継手が変形し、正常な連結に支障をきたすおそれがある。そこでこれを避けるためにヤットコと呼ばれる保護キャップが用いられる。なお、保護キャップは、打設の完了後に取り外される。 Steel pipe piles and sheet piles are driven in by vibration method, rotary method, middle digging method, pre-boring method, etc. For example, in the vibration method, since vibration is applied to the ground by a vibro hammer and press-fitted into the ground, a mechanical joint provided on a steel pipe pile / steel pipe sheet pile can be directly gripped by a vibro chuck suspended from a crane. May be deformed and interfere with normal connection. Therefore, in order to avoid this, a protective cap called Yatko is used. The protective cap is removed after the placement is completed.

保護キャップは、ピン継手に着脱可能な本体部を備え、本体部にピン継手をちょうど挿入し得る内周面を有し、この内周面にピン継手の外向き溝部に相対する位置に内向き溝部が設けられている。抜止キーを、本体に設けられた開口部を介して保護キャップの外部から挿入し、内向き溝部と、ピン継手に設けられている外向き溝部とに跨るように配置することにより、保護キャップとピン継手とが機械的に連結される。 The protective cap has a body portion that can be attached to and detached from the pin joint, and has an inner peripheral surface into which the pin joint can be just inserted, and the inner peripheral surface faces inward at a position facing the outward groove portion of the pin joint. A groove is provided. The retaining key is inserted from the outside of the protective cap through the opening provided in the main body, and is arranged so as to straddle the inward groove portion and the outward groove portion provided in the pin joint to form the protective cap. It is mechanically connected to the pin joint.

抜止キーは、内向き溝部と外向き溝部とから構成されるキー溝内に配置される円弧状のキー部と、該キー部の一端に一体的に形成され、該キー部を前記キー溝内に配置したときに開口部の正面視における左右の縁面に接触することによって、該キー部が前記キー溝内において、鋼管の周方向に移動することを阻止する係止部とから構成されている。抜止キーの取り外し時には、この係止部を利用することによって、抜止キーはキー溝から容易に引っ張り出すことができる。 The retaining key is integrally formed with an arcuate key portion arranged in a key groove composed of an inward groove portion and an outward groove portion and one end of the key portion, and the key portion is integrally formed in the key groove. It is composed of a locking portion that prevents the key portion from moving in the circumferential direction of the steel pipe in the key groove by contacting the left and right edge surfaces of the opening when arranged in the front view. There is. When removing the retaining key, the retaining key can be easily pulled out from the keyway by using this locking portion.

特開2006-011225号公報Japanese Unexamined Patent Publication No. 2006-011225

ところで、上述のような打ち込み施工時において、保護キャップとピン継手との抜止をすべく抜止キーには大きな負荷がかかる。このとき係止部には、これに接触する左右の縁面や、開口部の正面視における上下の縁面からの大きな荷重が作用する。この荷重によって、例えば、キー部と係止部との境界部分には曲げモーメントが発生し、これによって該境界部分において破損する虞があった。 By the way, at the time of driving as described above, a large load is applied to the retaining key in order to disconnect the protective cap and the pin joint. At this time, a large load acts on the locking portion from the left and right edge surfaces in contact with the locking portion and from the upper and lower edge surfaces in front view of the opening. Due to this load, for example, a bending moment is generated at the boundary portion between the key portion and the locking portion, which may cause damage at the boundary portion.

本発明は上記実情に鑑みてなされたものであって、抜止キーの破断の虞がない保護キャップを提供することを目的とする。 The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a protective cap in which there is no risk of breakage of the retaining key.

上述の目的を達成するための、本発明に係る保護キャップの特徴構成は、鋼管の端部に振り分けて備えられたピン継手及びボックス継手によって、長手方向に連結可能に構成された鋼管杭・鋼管矢板の打ち込み施工時に、打ち込まれる鋼管杭・鋼管矢板に備えられた前記ピン継手に着脱可能な保護キャップであって、少なくとも前記ピン継手のうち外向き凹部が設けられている部分を外囲し得る本体部と、前記本体部の内周面のうち前記外向き凹部と相対する位置に設けられた内向き凹部と、前記外向き凹部とから構成されるキー溝に配置されることによって、該保護キャップと前記ピン継手とを抜止状態で連結する抜止キーと、を備え、前記本体部に、前記キー溝に対して前記抜止キーを出し入れする際に利用可能な開口部が設けられてあり、前記抜止キーは、前記キー溝内に配置されるキー部が設けられてあり、前記本体部に、前記内向き凹部に連通する連通穴が設けられてあり、前記連通穴に、その一部が少なくとも前記内向き凹部に位置するように衝止部材が設置可能に構成され、前記衝止部材の前記一部に前記キー部が当接することによって、前記抜止キーはそれより前記キー溝の奥へ移動することが阻止されるように構成されている点にある。 The characteristic configuration of the protective cap according to the present invention for achieving the above-mentioned object is a steel pipe pile / steel pipe configured to be connectable in the longitudinal direction by a pin joint and a box joint provided separately at the end of the steel pipe. It is a protective cap that can be attached to and detached from the pin joint provided on the steel pipe pile / steel pipe sheet pile to be driven at the time of driving the sheet pile, and can surround at least the portion of the pin joint provided with the outward recess. The protection is provided by arranging the main body, an inward recess provided at a position facing the outward recess on the inner peripheral surface of the main body, and a key groove composed of the outward recess. A retaining key for connecting the cap and the pin joint in a retracted state is provided, and the main body is provided with an opening that can be used when inserting and removing the retaining key from the key groove. The retaining key is provided with a key portion arranged in the key groove, the main body portion is provided with a communication hole communicating with the inward concave portion, and at least a part thereof is provided in the communication hole. The abutment member is configured to be displaceable so as to be located in the inward recess, and when the key portion abuts on the part of the abutting member, the retaining key moves further into the key groove. The point is that it is configured to prevent it from being done.

上述の構成によると、衝止部材が連通穴に設置されているとき、その一部がキー溝内に位置しているので、抜止キーのキー部は衝止部材の一部に当接し、抜止キーはそれよりキー溝の奥へ移動することが阻止される。したがって、従来、抜止キーに設けられていた係止部が必ずしも必要でない。なお、抜止キーの取り出しは、衝止部材を連通穴から取り外し、例えば連通穴に挿通した治具によって抜止キーのキー部を押し戻すことによって可能となる。 According to the above configuration, when the abutting member is installed in the communication hole, a part of the abutting member is located in the key groove, so that the key portion of the retaining key abuts on a part of the abutting member to prevent the abutting member. The key is prevented from moving further into the keyway. Therefore, the locking portion conventionally provided on the retaining key is not always necessary. The retaining key can be taken out by removing the abutting member from the communication hole and pushing back the key portion of the retaining key with a jig inserted into the communication hole, for example.

本発明においては、前記抜止キーは、前記キー部の一端に一体的に形成され、該キー部を前記キー溝内に配置したときに前記開口部の正面視における左右の縁面に接触する係止部が更に設けられてあり、前記係止部は、前記左右の縁面のうち、前記本体部の径方向に沿うような方向における、内側寄りの部分に接触するような長さに構成されていると好適である。 In the present invention, the retaining key is integrally formed at one end of the key portion, and when the key portion is arranged in the key groove, the retaining key is in contact with the left and right edge surfaces of the opening in front view. A stop portion is further provided, and the locking portion is configured to have a length that contacts the inward portion of the left and right edge surfaces in a direction along the radial direction of the main body portion. It is preferable to have.

上述の構成によると、キー部をキー溝内に配置したときに係止部が開口部の正面視における左右の縁面に接触することによって、キー部がキー溝の奥へ移動することを阻止することができる。また、係止部は、開口部の正面視における上下の縁面に対して、本体部の径方向に沿うような方向における、内側寄りの部分において接触することになる。係止部の長さが短いことから、打ち込み施工時において、キー部と係止部との境界部分が左右の縁面や、上下の縁面から受ける力によって生じる曲げモーメントは、上下の縁面に対して、本体部の径方向に沿うような方向における、外側寄りの部分に接触する場合に比べて低減されることとなる。このように係止部に集中する応力が緩和されるため抜止キーの耐久性が向上する。そして、抜止キーの耐久性能が向上することによって、施工時における破損が発生しにくく、結果として経済性が向上する。 According to the above configuration, when the key portion is arranged in the key groove, the locking portion comes into contact with the left and right edge surfaces in the front view of the opening, thereby preventing the key portion from moving to the depth of the key groove. can do. Further, the locking portion comes into contact with the upper and lower edge surfaces of the opening in the front view at a portion toward the inside in a direction along the radial direction of the main body portion. Since the length of the locking portion is short, the bending moment generated by the force received from the left and right edge surfaces and the upper and lower edge surfaces at the boundary between the key portion and the locking portion during driving work is the upper and lower edge surfaces. On the other hand, it is reduced as compared with the case where it comes into contact with a portion closer to the outside in a direction along the radial direction of the main body portion. Since the stress concentrated on the locking portion is relaxed in this way, the durability of the retaining key is improved. Further, by improving the durability performance of the retaining key, damage during construction is less likely to occur, and as a result, economic efficiency is improved.

本発明においては、前記抜止キーは、前記キー部の一端に一体的に形成され、該キー部を前記キー溝内に配置したときに前記開口部の正面視における左右の縁面に接触する係止部が更に設けられてあり、前記係止部は、前記左右の縁面のうち、前記本体部の径方向に沿うような方向における、外側寄りの部分に接触するような長さに構成されるとともに、前記本体部の軸心方向に沿うような方向における、厚みが、前記本体部の径方向に沿うような方向における、内側の基端部から、前記本体部の径方向に沿うような方向における、外側の先端部に至るにつれて薄くなるように構成されていると好適である。 In the present invention, the retaining key is integrally formed at one end of the key portion, and when the key portion is arranged in the key groove, the retaining key is in contact with the left and right edge surfaces of the opening in front view. A stop portion is further provided, and the locking portion is configured to have a length that contacts the outer portion of the left and right edge surfaces in a direction along the radial direction of the main body portion. In addition, the thickness in the direction along the axial direction of the main body portion is along the radial direction of the main body portion from the inner base end portion in the direction along the radial direction of the main body portion. It is preferable that the structure becomes thinner toward the outer tip in the direction.

上述の構成によると、キー部をキー溝内に配置したときに係止部が開口部の正面視における左右の縁面に接触することによって、キー部がキー溝の奥へ移動することを阻止することができる。また、上述のように、抜止キーの係止部が、基端部から先端部にかけて厚みが薄くなるように構成されていると、係止部は開口部の上下の縁面に対して接触しない。したがって、打ち込み施工時において、キー部と係止部との境界部分が少なくとも開口部の上下の縁面から荷重を受けない。係止部に集中する応力が緩和されるため抜止キーの耐久性が向上する。そして、抜止キーの耐久性能が向上することによって、施工時における破損が発生しにくく、結果として経済性が向上する。 According to the above configuration, when the key portion is arranged in the key groove, the locking portion comes into contact with the left and right edge surfaces in the front view of the opening, thereby preventing the key portion from moving to the depth of the key groove. can do. Further, as described above, when the locking portion of the retaining key is configured to be thinner from the base end portion to the tip end portion, the locking portion does not come into contact with the upper and lower edge surfaces of the opening portion. .. Therefore, at the time of driving construction, the boundary portion between the key portion and the locking portion does not receive a load from at least the upper and lower edge surfaces of the opening. Since the stress concentrated on the locking portion is relaxed, the durability of the retaining key is improved. Further, by improving the durability performance of the retaining key, damage during construction is less likely to occur, and as a result, economic efficiency is improved.

前記開口部の正面視における左右の縁面は互いに正対するように構成され、前記抜止キーは、前記キー部の一端に一体的に形成され、該キー部を前記キー溝内に配置したときに前記開口部の正面視における左右の縁面に接触する係止部が更に設けられてあり、前記係止部は、前記左右の縁面との対向面が、該左右の縁面と面接触するように構成されていると好適である。 The left and right edge surfaces of the opening in front view are configured to face each other, and the retaining key is integrally formed at one end of the key portion, and when the key portion is arranged in the key groove. Further, a locking portion that contacts the left and right edge surfaces in the front view of the opening is provided, and in the locking portion, the surface facing the left and right edge surfaces comes into surface contact with the left and right edge surfaces. It is preferable that it is configured as such.

上述の構成によると、キー部をキー溝内に配置したときに係止部が開口部の正面視における左右の縁面に接触することによって、キー部がキー溝の奥へ移動することを阻止することができる。また、抜止キーの係止部は、左右の縁面との対向面が該左右の縁面と面接触するように構成されていることから、打ち込み施工時において、左右の縁面から受ける分布荷重によって生じる曲げモーメントは、係止部の先端部に集中荷重が作用する場合に比べて低減されることとなる。このように係止部に集中する応力が緩和されるため抜止キーの耐久性が向上する。そして、抜止キーの耐久性能が向上することによって、施工時における破損が発生しにくく、結果として経済性が向上する。 According to the above configuration, when the key portion is arranged in the key groove, the locking portion comes into contact with the left and right edge surfaces in the front view of the opening, thereby preventing the key portion from moving to the depth of the key groove. can do. Further, since the locking portion of the retaining key is configured so that the surface facing the left and right edge surfaces is in surface contact with the left and right edge surfaces, the distributed load received from the left and right edge surfaces during the driving work. The bending moment generated by the above is reduced as compared with the case where a concentrated load acts on the tip of the locking portion. Since the stress concentrated on the locking portion is relaxed in this way, the durability of the retaining key is improved. Further, by improving the durability performance of the retaining key, damage during construction is less likely to occur, and as a result, economic efficiency is improved.

本発明においては、前記開口部の前記左の縁面の側に配置された前記抜止キーと、前記開口部の前記右の縁面の側に配置された前記抜止キーとの間に配置され、前記左右一対の抜止キーが、前記開口部から脱落することを防止する脱落防止部材が備えられ、前記係止部に、前記脱落防止部材が前記開口部から脱落することを防止する脱落防止機構が備えられ、前記脱落防止機構は、前記係止部の、前記本体部の径方向に沿うような方向における、外側の先端部に、前記脱落防止部材の、前記本体部の径方向に沿うような方向における、外側の表面に接触するように設けられた掛止部から構成されていると好適である。 In the present invention, the retaining key is arranged between the retaining key arranged on the left edge surface side of the opening and the retaining key arranged on the right edge surface side of the opening. The pair of left and right retaining keys are provided with a dropout prevention member that prevents the pair of left and right retaining keys from falling out of the opening, and the locking portion is provided with a dropout prevention mechanism that prevents the dropout prevention member from falling out of the opening. The fall prevention mechanism is provided such that the locking portion is provided at the outer tip portion of the locking portion in a direction along the radial direction of the main body portion, and the fall prevention member is provided along the radial direction of the main body portion. It is preferable that the hook portion is provided so as to be in contact with the outer surface in the direction.

開口部から左右両方向に配置した一対の抜止キーどうしの間には、脱落防止部材が配置されることによって、一対の抜止キーの脱落を防止しているが、この脱落防止部材が脱落してしまうと、一対の抜止キーが脱落する虞がある。上述の構成によると、係止部の先端部に設けられた掛止部によって、脱落防止部材の脱落が防止されるため、結果として一対の抜止キーの脱落が防止される。 By arranging a dropout prevention member between the pair of retaining keys arranged in both the left and right directions from the opening, the pair of retaining keys are prevented from falling off, but the dropout prevention member falls off. Then, there is a risk that the pair of retaining keys will fall off. According to the above configuration, the hooking portion provided at the tip of the locking portion prevents the fallout prevention member from falling off, and as a result, the pair of retaining keys are prevented from falling off.

本発明においては、前記開口部の前記左の縁面の側に配置された前記抜止キーのキー部と、前記開口部の前記右の縁面の側に配置された前記抜止キーのキー部とを連結する連結部材が備えられていると好適である。 In the present invention, the key portion of the retaining key arranged on the left edge surface side of the opening and the key portion of the retaining key arranged on the right edge surface side of the opening. It is preferable that a connecting member for connecting the above is provided.

上述の構成によると、抜止キーのキー部と係止部との境界部分が破断したとしても、連結部材によって、係止部を失った抜止キーのキー部がキー溝内において、鋼管の周方向に移動することが阻止される。 According to the above configuration, even if the boundary portion between the key portion of the retaining key and the locking portion is broken, the key portion of the retaining key that has lost the locking portion due to the connecting member is in the key groove in the circumferential direction of the steel pipe. It is blocked from moving to.

本発明の実施形態に係る保護キャップ及びピン継手の説明図Explanatory drawing of protective cap and pin joint which concerns on embodiment of this invention 図1に示された保護キャップの要部の側断面図Side sectional view of the main part of the protective cap shown in FIG. 図1に示された保護キャップの要部の平断面図A plan sectional view of a main part of the protective cap shown in FIG. 本発明の別実施形態に係る抜止キーを有する保護キャップの平断面図A plan sectional view of a protective cap having a retaining key according to another embodiment of the present invention. 本発明の別実施形態に係る抜止キーを有する保護キャップの側断面図Side sectional view of a protective cap having a retaining key according to another embodiment of the present invention. 本発明の別実施形態に係る抜止キーを有する保護キャップの平断面図A plan sectional view of a protective cap having a retaining key according to another embodiment of the present invention. 脱落防止部材の説明図Explanatory drawing of fall prevention member 連結部材の説明図Explanatory drawing of connecting member 本発明の別実施形態に係る保護キャップの説明図Explanatory drawing of protective cap which concerns on another embodiment of this invention

以下に本発明に係る鋼管杭・鋼管矢板に着脱可能な保護キャップの実施形態を図面に基づいて説明する。図1には、保護キャップ4と、鋼管杭1の一部とが示されている。 An embodiment of a protective cap that can be attached to and detached from a steel pipe pile / steel pipe sheet pile according to the present invention will be described below with reference to the drawings. FIG. 1 shows a protective cap 4 and a part of a steel pipe pile 1.

鋼管杭1は、鋼管2の端部に振り分けて設けられたピン継手3と、図示しないボックス継手とによって長手方向に連結可能に構成されている。なお、鋼管2は、スパイラル鋼管、UO鋼管等の溶接管、シームレス鋼管、鍛接鋼管、鋳鋼管等であってよく、ピン継手3及び前記ボックス継手は鋼管2の端部に溶接によって接合されている。 The steel pipe pile 1 is configured to be connectable in the longitudinal direction by a pin joint 3 provided separately at the end of the steel pipe 2 and a box joint (not shown). The steel pipe 2 may be a spiral steel pipe, a welded pipe such as a UO steel pipe, a seamless steel pipe, a forge welded steel pipe, a cast steel pipe, or the like, and the pin joint 3 and the box joint are joined to the end of the steel pipe 2 by welding. ..

ピン継手3はその外周面31のうち、図示しないボックス継手に設けられた内向き溝部と相対する位置に、周方向に沿って一条の外向き溝部32が設けられている。この外向き溝部32が本発明に係る外向き凹部である。外向き溝部32と前記内向き溝部とから構成されるキー溝に跨るように前記荷重伝達キーが配置されることによって、ピン継手3と前記ボックス継手とが抜け止め状態となる。 The pin joint 3 is provided with a single outward groove portion 32 along the circumferential direction at a position of the outer peripheral surface 31 facing the inward groove portion provided in the box joint (not shown). The outward groove portion 32 is an outward recess according to the present invention. By arranging the load transmission key so as to straddle the key groove composed of the outward groove portion 32 and the inward groove portion, the pin joint 3 and the box joint are in a preventive state.

さらに、ピン継手3の外周面33の縁面には前記ボックス継手に設けられたボックス側凹部と相対する位置にピン側凹部34が設けられている。ピン側凹部34と前記ボックス側凹部とから構成されるキー溝に跨るように回転抑止キー35が配置されることによって、ピン継手3と前記ボックス継手とが回り止め状態となる。 Further, a pin-side recess 34 is provided on the edge surface of the outer peripheral surface 33 of the pin joint 3 at a position facing the box-side recess provided in the box joint. By arranging the rotation restraining key 35 so as to straddle the key groove composed of the pin-side recess 34 and the box-side recess, the pin joint 3 and the box joint are put into a non-rotating state.

このような鋼管杭1を、バイブロハンマによって振動を付与しつつ地盤に圧入する振動工法によって打ち込み施工するにあたり、クレーンに吊設されたバイブロチャックで鋼管杭1のピン継手3や前記ボックス継手を直接把持することを避けるために、本発明に係る保護キャップ4が用いられる。 When driving such a steel pipe pile 1 by a vibration method in which vibration is applied to the ground by a vibro hammer, the pin joint 3 of the steel pipe pile 1 and the box joint are directly gripped by a vibro chuck suspended from a crane. In order to avoid this, the protective cap 4 according to the present invention is used.

保護キャップ4は、ピン継手3の外向き溝部32が設けられている外周面31を外囲し得る円筒状の本体部41を有する。したがって、鋼管2、ピン継手3及び本体部41は軸心が一致する。 The protective cap 4 has a cylindrical main body portion 41 that can surround the outer peripheral surface 31 provided with the outward groove portion 32 of the pin joint 3. Therefore, the axes of the steel pipe 2, the pin joint 3, and the main body 41 are aligned.

本体部41の内周面42のうちピン継手3の外向き溝部32に相対する位置に、内向き溝部44が設けられている。この内向き溝部44が本発明に係る内向き凹部である。保護キャップ4の本体部41には、内向き溝部44に連通する開口部45が設けられている。 An inward groove 44 is provided at a position of the inner peripheral surface 42 of the main body 41 facing the outward groove 32 of the pin joint 3. The inward groove 44 is an inward recess according to the present invention. The main body 41 of the protective cap 4 is provided with an opening 45 communicating with the inward groove 44.

図2及び図3に示すように、開口部45は、該開口部45の正面視における左右の縁面45L,45Rは互いに正対するように構成され、及び上下の縁面45T,45Bは互いに正対するように構成されている。 As shown in FIGS. 2 and 3, the opening 45 is configured such that the left and right edge surfaces 45L and 45R of the opening 45 face each other in front view, and the upper and lower edge surfaces 45T and 45B are positive to each other. It is configured to be against.

図1から図3に示すように、保護キャップ4は、内向き溝部44と外向き溝部32とから構成されるキー溝に跨って配置されピン継手3を抜け止めする抜止キー5を備えている。 As shown in FIGS. 1 to 3, the protective cap 4 includes a retaining key 5 that is arranged across a key groove composed of an inward groove portion 44 and an outward groove portion 32 to prevent the pin joint 3 from coming off. ..

抜止キー5は、円弧状のキー部51と、キー部51の一端に一体的に形成された係止部52とが設けられている。 The retaining key 5 is provided with an arc-shaped key portion 51 and a locking portion 52 integrally formed at one end of the key portion 51.

該キー部51を内向き溝部44と外向き溝部32とから構成されるキー溝内に配置したときに、係止部52は開口部45のうち左の縁面45Lないし右の縁面45Rに接触する。 When the key portion 51 is arranged in the key groove composed of the inward groove portion 44 and the outward groove portion 32, the locking portion 52 is formed on the left edge surface 45L or the right edge surface 45R of the opening 45. Contact.

その際、本実施形態に係る抜止キー5は係止部52の長さ、すなわち、本体部41の径方向に沿うような方向における、内側の基端部52Bから、本体部41の径方向に沿うような方向における、外側の先端部52Tまでの長さが、キー部51の、本体部41の軸心方向に沿うような方向における、厚みの4割くらいに構成されている。係止部52の先端部は左右の縁面45L,45Rのうち、本体部41の径方向に沿うような方向における、内側寄りの部分に接触する。 At that time, the retaining key 5 according to the present embodiment is in the radial direction of the main body portion 41 from the inner base end portion 52B in the length of the locking portion 52, that is, in the direction along the radial direction of the main body portion 41. The length up to the outer tip portion 52T in the direction along the axis is about 40% of the thickness of the key portion 51 in the direction along the axial direction of the main body portion 41. The tip portion of the locking portion 52 contacts the left and right edge surfaces 45L and 45R, which are closer to the inside in the direction along the radial direction of the main body portion 41.

係止部52の長さが短いことから、キー部51と係止部52との境界部分が左右の縁面45L,45Rや、上下の縁面45T,45Bから受ける力によって生じる曲げモーメントは、上下の縁面45T,45Bに対して、本体部41の径方向に沿うような方向における、外側寄りの部分に接触する場合に比べて低減されることとなる。このように係止部52に集中する応力が緩和されるため抜止キー5の耐久性が向上する。そして、抜止キー5の耐久性能が向上することによって、施工時における破損が発生しにくく、結果として経済性が向上する。 Since the length of the locking portion 52 is short, the bending moment generated by the force that the boundary portion between the key portion 51 and the locking portion 52 receives from the left and right edge surfaces 45L and 45R and the upper and lower edge surfaces 45T and 45B is This is reduced as compared with the case where the upper and lower edge surfaces 45T and 45B are in contact with the outer portion in the direction along the radial direction of the main body portion 41. Since the stress concentrated on the locking portion 52 is relaxed in this way, the durability of the retaining key 5 is improved. Further, by improving the durability performance of the retaining key 5, damage during construction is less likely to occur, and as a result, economic efficiency is improved.

このように構成された抜止キー5が、外向き溝部32と内向き溝部44とから構成されるキー溝に跨るように配置されることによって、ピン継手3と保護キャップ4とが抜け止め状態となる。 The retaining key 5 configured in this way is arranged so as to straddle the key groove composed of the outward groove portion 32 and the inward groove portion 44, so that the pin joint 3 and the protective cap 4 are prevented from coming off. Become.

ところで、従来のように、抜止キー5の係止部52が、開口部45の、本体部41の径方向に沿うような方向における、外側の表面近傍まで至るような長さを有していると、抜止キー5をキー溝から取り外す際に、この該係止部を把持などすることができるため作業性がよい。しかし、抜止キー5の係止部52が短いと、開口部45の奥まったところに位置するため把持などがしにくく、したがって抜止キー5が取り出しにくいという問題がある。 By the way, as in the conventional case, the locking portion 52 of the retaining key 5 has a length of the opening 45 extending to the vicinity of the outer surface in the direction along the radial direction of the main body portion 41. The workability is good because the locking portion can be gripped when the retaining key 5 is removed from the key groove. However, if the locking portion 52 of the retaining key 5 is short, it is difficult to grip the opening 45 because it is located in the deep part of the opening 45, and therefore it is difficult to remove the retaining key 5.

そこで、係止部52には、本体部41の周方向に沿うような方向に、貫通穴53が設けられている。係止部52に設けられた貫通穴53に、予め鈍し鉄線54や結束バンドを挿通させた状態のまま、抜止キー5をキー溝に配置すると、抜止キー5を取り外す際には鈍し鉄線54や結束バンドを把持などすることができるため、抜止キー5が取り出しやすい。ただし、貫通穴53は、本体部41の周方向に沿うような方向に、係止部52に備えられている必要はなく、本体部41の周方向に交差する方向に備えられていてもよい。また、貫通穴53は、抜止キー5に必須の構成ではない。 Therefore, the locking portion 52 is provided with a through hole 53 in a direction along the circumferential direction of the main body portion 41. If the retaining key 5 is placed in the keyway with the blunted iron wire 54 and the binding band inserted in the through hole 53 provided in the locking portion 52 in advance, the blunted iron wire is used when the retaining key 5 is removed. Since the 54 and the binding band can be gripped, the retaining key 5 can be easily taken out. However, the through hole 53 does not have to be provided in the locking portion 52 in a direction along the circumferential direction of the main body portion 41, and may be provided in a direction intersecting the circumferential direction of the main body portion 41. .. Further, the through hole 53 is not an essential configuration for the retaining key 5.

なお、保護キャップ4は、外周面43の縁面のうち、ピン継手3に設けられたピン側凹部34に相対する位置にキャップ側凹部48が設けられている。ピン側凹部34とキャップ側凹部48とから構成されるキー溝に跨るように、上述の回転抑止キー35が配置されることによって、ピン継手3と保護キャップ4とが回り止め状態となる。 The protective cap 4 is provided with a cap-side recess 48 at a position facing the pin-side recess 34 provided in the pin joint 3 on the edge surface of the outer peripheral surface 43. By arranging the above-mentioned rotation restraining key 35 so as to straddle the key groove composed of the pin-side recess 34 and the cap-side recess 48, the pin joint 3 and the protective cap 4 are put into a non-rotating state.

以下に、保護キャップの別実施形態について説明する。以下の説明において、上述した実施形態における構成と同様の構成については同じ符号を付して説明を省略する。 Hereinafter, another embodiment of the protective cap will be described. In the following description, the same components as those in the above-described embodiment will be designated by the same reference numerals and description thereof will be omitted.

図4及び図5に示す実施形態においては、抜止キー6は、円弧状のキー部61と、キー部61の一端に一体的に形成された係止部62とが設けられている。係止部62は、左右の縁面45L,45Rのうち、本体部41の径方向に沿うような方向における、外側寄りの部分に接触するような長さに構成されるとともに、本体部41の径方向に沿うような方向における、厚みが、本体部41の径方向に沿うような方向における、内側の基端部62Bから、本体部41の径方向に沿うような方向における、外側の先端部62Tに至るにつれて薄くなるように構成されている。 In the embodiment shown in FIGS. 4 and 5, the retaining key 6 is provided with an arcuate key portion 61 and a locking portion 62 integrally formed at one end of the key portion 61. The locking portion 62 is configured to have a length that contacts the outer portion of the left and right edge surfaces 45L and 45R in a direction along the radial direction of the main body portion 41, and the main body portion 41. From the inner base end portion 62B in the direction along the radial direction and in the direction in which the thickness is along the radial direction of the main body portion 41, the outer tip portion in the direction along the radial direction of the main body portion 41. It is configured to become thinner as it reaches 62T.

抜止キー6の係止部62が、基端部62Bから先端部62Tにかけて厚みが薄くなるように構成されていると、係止部62は開口部45の上下の縁面45T,45Bに対して接触しない。したがって、打ち込み施工時において、キー部61と係止部62との境界部分が少なくとも開口部45の上下の縁面45T,45Bから荷重を受けない。係止部62に集中する応力が緩和されるため抜止キー6の耐久性が向上する。そして、抜止キー6の耐久性能が向上することによって、施工時における破損が発生しにくく、結果として経済性が向上する。 When the locking portion 62 of the retaining key 6 is configured to be thinner from the base end portion 62B to the tip end portion 62T, the locking portion 62 is configured with respect to the upper and lower edge surfaces 45T and 45B of the opening 45. Do not touch. Therefore, at the time of driving construction, the boundary portion between the key portion 61 and the locking portion 62 does not receive a load from at least the upper and lower edge surfaces 45T and 45B of the opening 45. Since the stress concentrated on the locking portion 62 is relaxed, the durability of the retaining key 6 is improved. Further, by improving the durability performance of the retaining key 6, damage during construction is less likely to occur, and as a result, economic efficiency is improved.

図6に示す実施形態においては、抜止キー7は、円弧状のキー部71と、キー部71の一端に一体的に形成された係止部72とが設けられている。係止部72は、左右の縁面45L,45Rのうち、本体部41の径方向に沿うような方向における、外側寄りの部分に接触するような長さに構成されるとともに、係止部72は、左右の縁面45L,45Rとの対向面73が、該左右の縁面45L,45Rと面接触するように構成されている。 In the embodiment shown in FIG. 6, the retaining key 7 is provided with an arc-shaped key portion 71 and a locking portion 72 integrally formed at one end of the key portion 71. The locking portion 72 is configured to have a length that contacts the outer portion of the left and right edge surfaces 45L and 45R in a direction along the radial direction of the main body portion 41, and the locking portion 72 is formed. Is configured such that the facing surface 73 with the left and right edge surfaces 45L and 45R is in surface contact with the left and right edge surfaces 45L and 45R.

これにより、打ち込み施工時において、対向面73が左右の縁面45L,45Rから受ける分布荷重によって、係止部72に生じる曲げモーメントは、係止部72の先端部に集中荷重が作用する場合に比べて低減されることとなる。このように係止部72に集中する応力が緩和されるため抜止キー7の耐久性が向上する。そして、抜止キー7の耐久性能が向上することによって、施工時における破損が発生しにくく、結果として経済性が向上する。 As a result, the bending moment generated in the locking portion 72 due to the distributed load received by the facing surfaces 73 from the left and right edge surfaces 45L and 45R during the driving construction is when a concentrated load acts on the tip portion of the locking portion 72. It will be reduced in comparison. Since the stress concentrated on the locking portion 72 is relaxed in this way, the durability of the retaining key 7 is improved. Further, by improving the durability performance of the retaining key 7, damage is less likely to occur during construction, and as a result, economic efficiency is improved.

なお、該実施形態において、係止部72は、本体部41の軸心方向に沿うような方向における、厚みが、本体部41の径方向に沿うような方向における、内側の基端部72Bから、本体部41の径方向に沿うような方向における、外側の先端部72Tに至るにつれて薄くなるように構成されていてもよい。 In the embodiment, the locking portion 72 is from the inner base end portion 72B in the direction along the axial direction of the main body portion 41 and in the direction in which the thickness is along the radial direction of the main body portion 41. , It may be configured to become thinner toward the outer tip portion 72T in the direction along the radial direction of the main body portion 41.

抜止キー7の係止部72が、基端部77Bから先端部77Tにかけて厚みが薄くなるように構成されていると、係止部72は開口部45の上下の縁面45T,45Bに対して接触しない。したがって、キー部71と係止部72との境界部分が少なくとも開口部45の上下の縁面45T,45Bから荷重を受けない。係止部72に集中する応力が緩和されるため抜止キー7の耐久性が向上する。そして、抜止キー7の耐久性能が向上することによって、施工時における破損が発生しにくく、結果として経済性が向上する。 When the locking portion 72 of the retaining key 7 is configured to become thinner from the base end portion 77B to the tip end portion 77T, the locking portion 72 is configured with respect to the upper and lower edge surfaces 45T and 45B of the opening 45. Do not touch. Therefore, the boundary portion between the key portion 71 and the locking portion 72 does not receive a load from at least the upper and lower edge surfaces 45T and 45B of the opening 45. Since the stress concentrated on the locking portion 72 is relaxed, the durability of the retaining key 7 is improved. Further, by improving the durability performance of the retaining key 7, damage is less likely to occur during construction, and as a result, economic efficiency is improved.

なお、上述したいずれの実施形態においても、保護キャップ4は、脱落防止部材10が備えられてもよい。脱落防止部材10は、図7に示すように、開口部45の左の縁面45Lの側に配置された抜止キー8Lと、開口部45の右の縁面45Rの側に配置された抜止キー8Rとの間に配置され、左右一対の抜止キー8L,8Rが、開口部45から脱落することを防止する。なお、脱落防止部材10は、スポンジゴム等の低反発軟質発泡体や、ゴム、プラスチック、木等の低反発軟質材料のように、衝撃荷重を吸収可能であり、かつ、荷重が取り除かれると形状が元に戻るような弾性体から構成されていると好ましい。なお、抜止キー8L,8Rは説明の便宜上呼び分けているが、同じ構成の抜止キーである。したがって、両者を入れ替えても同様の説明が成り立つ。 In any of the above-described embodiments, the protective cap 4 may be provided with a fall prevention member 10. As shown in FIG. 7, the falling-off prevention member 10 has a retaining key 8L arranged on the left edge surface 45L side of the opening 45 and a retaining key arranged on the right edge surface 45R side of the opening 45. A pair of left and right retaining keys 8L and 8R, which are arranged between the 8R and the 8R, are prevented from falling out from the opening 45. The fall-off prevention member 10 can absorb an impact load and has a shape when the load is removed, such as a low-resilience soft foam such as sponge rubber and a low-resilience soft material such as rubber, plastic, and wood. It is preferable that the material is composed of an elastic body that returns to the original state. Although the retaining keys 8L and 8R are called separately for convenience of explanation, they are retaining keys having the same configuration. Therefore, the same explanation holds even if the two are exchanged.

その際、係止部82L,82Rに、脱落防止部材10が開口部45から脱落することを防止する脱落防止機構が備えられてもよい。該脱落防止機構は、係止部82L,82Rの先端部に、脱落防止部材10の、本体部41の径方向に沿うような方向における、外側の表面に接触するように設けられた掛止部83L,83Rから構成されている。係止部82L,82Rの先端部に設けられた掛止部83L,83Rによって、脱落防止部材10の脱落が防止されるため、結果として一対の抜止キー8L,8Rの脱落が防止される。 At that time, the locking portions 82L and 82R may be provided with a dropout prevention mechanism for preventing the dropout prevention member 10 from falling off from the opening 45. The fall prevention mechanism is provided at the tip of the locking portions 82L and 82R so as to come into contact with the outer surface of the fall prevention member 10 in a direction along the radial direction of the main body portion 41. It is composed of 83L and 83R. The hooking portions 83L and 83R provided at the tips of the locking portions 82L and 82R prevent the fall-off prevention member 10 from falling off, and as a result, the pair of retaining keys 8L and 8R are prevented from falling off.

また、保護キャップ4は、図8に示すように、開口部45の左の縁面45Lの側に配置された抜止キー9Lのキー部91Lと、開口部45の右の縁面45Rの側に配置された抜止キー9Rのキー部91Rとを連結する連結部材11が備えられていてもよい。連結部材11としては、バネ定数が0.1~1N/mm程度の引張バネや、鈍し鉄線が好適に例示できる。なお、抜止キー9L,9Rは説明の便宜上呼び分けているが、同じ構成の抜止キーである。したがって、両者を入れ替えても同様の説明が成り立つ。 Further, as shown in FIG. 8, the protective cap 4 is located on the side of the key portion 91L of the retaining key 9L arranged on the side of the left edge surface 45L of the opening 45 and the side of the right edge surface 45R of the opening 45. A connecting member 11 for connecting the key portion 91R of the arranged retaining key 9R may be provided. As the connecting member 11, a tension spring having a spring constant of about 0.1 to 1 N / mm and a blunted iron wire can be preferably exemplified. Although the retaining keys 9L and 9R are called separately for convenience of explanation, they are retaining keys having the same configuration. Therefore, the same explanation holds even if the two are exchanged.

抜止キー9L,9Rのキー部91L,91Rと係止部92L,92Rとの境界部分が破断したとしても、連結部材によって、係止部を失った抜止キーのキー部91L,91Rがキー溝内において、鋼管2の周方向に移動することが阻止される。 Even if the boundary between the key portions 91L and 91R of the retaining keys 9L and 9R and the locking portions 92L and 92R is broken, the key portions 91L and 91R of the retaining key that have lost the locking portion due to the connecting member are in the key groove. In, the movement of the steel pipe 2 in the circumferential direction is prevented.

この実施形態においても、抜止キー9Lと、抜止キー9Rとの間に、図7に示したような、脱落防止部材10が備えられてもよい。 Also in this embodiment, a dropout prevention member 10 as shown in FIG. 7 may be provided between the retaining key 9L and the retaining key 9R.

開口部45を覆うように、スリングベルトを本体部41の周囲に巻回させることによって、抜止キー5~9が開口部45を介してキー溝から抜け出さないようにしてもよい。 By winding the sling belt around the main body 41 so as to cover the opening 45, the retaining keys 5 to 9 may be prevented from coming out of the key groove through the opening 45.

また、保護キャップ4の鋼管杭1への連結は、抜止キー5を開口部45を介して取り出すことによって容易に解除され、これにより鋼管杭1から保護キャップ4を取り外すことができる。 Further, the connection of the protective cap 4 to the steel pipe pile 1 is easily released by taking out the retaining key 5 through the opening 45, whereby the protective cap 4 can be removed from the steel pipe pile 1.

保護キャップのさらなる別実施形態について説明する。以下の説明において、上述した実施形態における構成と同様の構成については同じ符号を付して説明を省略する。 Yet another embodiment of the protective cap will be described. In the following description, the same components as those in the above-described embodiment will be designated by the same reference numerals and description thereof will be omitted.

図9に示すように、本実施形態においては、保護キャップ4が有する抜止キー12は、円弧状のキー部のみから構成されている。 As shown in FIG. 9, in the present embodiment, the retaining key 12 included in the protective cap 4 is composed of only an arcuate key portion.

保護キャップ4の本体部41には、内向き溝部44に連通する連通穴13が設けられてある。 The main body 41 of the protective cap 4 is provided with a communication hole 13 that communicates with the inward groove 44.

連通穴13に、衝止部材14が設置可能に構成されている。衝止部材14は、本実施形態においてはボルト状の部材であり、衝止部材14及び連通穴13には、互いに螺合する螺子が形成してある。ただし、衝止部材14及び連通穴13に螺子が形成されていなくてもよい。この場合は、衝止部材14は、連通穴13に対して接着や溶接によって取り付けられる。 The abutment member 14 can be installed in the communication hole 13. The abutting member 14 is a bolt-shaped member in the present embodiment, and a screw screwing with each other is formed in the abutting member 14 and the communication hole 13. However, screws may not be formed in the abutting member 14 and the communication hole 13. In this case, the abutting member 14 is attached to the communication hole 13 by adhesion or welding.

衝止部材14は、連通穴13に設置されたときに、その一部が少なくとも内向き溝部44に位置するように構成されている。抜止キー12のキー部は衝止部材14の一部に当接し、抜止キー12はそれよりキー溝の奥へ移動することが阻止される。なお、連通穴13は、抜止キー12の、本体部41の周方向に沿うような方向における長さに応じて適当な位置、例えば衝止部材14の一部に抜止キー12のキー部が当接したときであっても、抜止キー12の一部が開口部45から見えるような位置に設けられる。 The abutting member 14 is configured such that when it is installed in the communication hole 13, at least a part thereof is located in the inward groove portion 44. The key portion of the retaining key 12 abuts on a part of the abutting member 14, and the retaining key 12 is prevented from moving further into the keyway. The communication hole 13 has an appropriate position according to the length of the retaining key 12 in a direction along the circumferential direction of the main body 41, for example, the key portion of the retaining key 12 hits a part of the abutting member 14. Even when they are in contact with each other, a part of the retaining key 12 is provided at a position where it can be seen from the opening 45.

なお、抜止キー12の取り出しは、衝止部材14を連通穴13から取り外し、例えば連通穴13に挿通した治具によって抜止キー12のキー部を押し戻すことによって可能となる。ただし、本実施形態においても、抜止キー12に上述した実施形態のように係止部が設けられていてもよい。 The retaining key 12 can be taken out by removing the abutting member 14 from the communication hole 13 and pushing back the key portion of the retaining key 12, for example, with a jig inserted into the communication hole 13. However, also in this embodiment, the retaining key 12 may be provided with a locking portion as in the above-described embodiment.

なお、本発明に係る保護キャップ4の着脱の対象である鋼管杭1が有するピン継手に設けられた外向き溝部32の条数は一条に限らない。二条以上の複数条であってもよい。保護キャップ4もこれらに対応して複数条の内向き溝部44を有してよい。なお、内向き凹部及び外向き凹部は溝状に限らない。 The number of rows of the outward groove portion 32 provided in the pin joint of the steel pipe pile 1 to be attached / detached to the protective cap 4 according to the present invention is not limited to one. There may be two or more articles. The protective cap 4 may also have a plurality of inward groove portions 44 corresponding to these. The inward recess and the outward recess are not limited to the groove shape.

上述した各実施形態においては、本発明に係る保護キャップ4の着脱の対象である鋼管杭1が、振動工法によって打ち込み施工される場合について説明したが、これに限らない。本発明に係る保護キャップ4は、鋼管杭1が、回転工法、中掘り工法及びプレボーリング工法のような工法によって打ち込み施工される際にも用いることができる。 In each of the above-described embodiments, the case where the steel pipe pile 1 which is the object of attachment / detachment of the protective cap 4 according to the present invention is driven by the vibration method has been described, but the present invention is not limited to this. The protective cap 4 according to the present invention can also be used when the steel pipe pile 1 is driven by a construction method such as a rotary construction method, a middle digging construction method and a pre-boring construction method.

上述した各実施形態は、いずれも本発明の一例であり、該記載により本発明が限定されるものではなく、各部の具体的構成は本発明の作用効果が奏される範囲で適宜変更設計可能である。 Each of the above-described embodiments is an example of the present invention, and the present invention is not limited by the description thereof, and the specific configuration of each part can be appropriately modified and designed within the range in which the action and effect of the present invention are exhibited. Is.

1 :鋼管杭
2 :鋼管
3 :ピン継手
4 :保護キャップ
5 :抜止キー
6 :抜止キー
7 :抜止キー
8 :抜止キー
9 :抜止キー
10 :脱落防止部材
11 :連結部材
12 :抜止キー
13 :貫通穴
14 :衝止部材
41 :本体部
42 :内周面
44 :内向き溝部(内向き凹部)
45 :開口部
45B :上の縁面
45L :左の縁面
45R :右の縁面
45T :下の縁面
51 :キー部
52 :係止部
52B :基端部
52T :先端部
61 :キー部
62 :係止部
62B :基端部
62T :先端部
71 :キー部
72 :係止部
72B :基端部
72T :先端部
73 :対向面
77B :基端部
77T :先端部
82L :係止部
82R :係止部
83L :掛止部
83R :掛止部
91L :キー部
91R :キー部
92L :係止部
92R :係止部
1: Steel pipe pile 2: Steel pipe 3: Pin joint 4: Protective cap 5: Retraction key 6: Retraction key 7: Retraction key 8: Retraction key 9: Retraction key 10: Detachment prevention member 11: Connecting member 12: Retraction key 13: Through hole 14: Anti-impact member 41: Main body 42: Inner peripheral surface 44: Inward groove (inward recess)
45: Opening 45B: Upper edge surface 45L: Left edge surface 45R: Right edge surface 45T: Lower edge surface 51: Key portion 52: Locking portion 52B: Base end portion 52T: Tip portion 61: Key portion 62: Locking portion 62B: Base end portion 62T: Tip portion 71: Key portion 72: Locking portion 72B: Base end portion 72T: Tip portion 73: Facing surface 77B: Base end portion 77T: Tip portion 82L: Locking portion 82R: Locking part 83L: Hooking part 83R: Hooking part 91L: Key part 91R: Key part 92L: Locking part 92R: Locking part

Claims (6)

鋼管の端部に振り分けて備えられたピン継手及びボックス継手によって、長手方向に連結可能に構成された鋼管杭・鋼管矢板の打ち込み施工時に、打ち込まれる鋼管杭・鋼管矢板に備えられた前記ピン継手に着脱可能な保護キャップであって、
少なくとも前記ピン継手のうち外向き凹部が設けられている部分を外囲し得る本体部と、
前記本体部の内周面のうち前記外向き凹部と相対する位置に設けられた内向き凹部と、前記外向き凹部とから構成されるキー溝に配置されることによって、該保護キャップと前記ピン継手とを抜止状態で連結する抜止キーと、を備え、
前記本体部に、前記キー溝に対して前記抜止キーを出し入れする際に利用可能な開口部が設けられてあり、
前記抜止キーは、前記キー溝内に配置されるキー部が設けられてあり、
前記本体部に、前記内向き凹部に連通する連通穴が設けられてあり、
前記連通穴に、その一部が少なくとも前記内向き凹部に位置するように衝止部材が設置可能に構成され、
前記衝止部材の前記一部に前記キー部が当接することによって、前記抜止キーはそれより前記キー溝の奥へ移動することが阻止されるように構成されている保護キャップ。
The pin joint provided for the steel pipe pile / steel pipe sheet pile to be driven during the driving work of the steel pipe pile / steel pipe sheet pile configured to be connectable in the longitudinal direction by the pin joint and the box joint provided separately at the end of the steel pipe. It is a removable protective cap
At least the main body that can surround the part of the pin joint where the outward recess is provided, and
The protective cap and the pin are arranged in a key groove composed of an inward recess provided at a position facing the outward recess on the inner peripheral surface of the main body and the outward recess. Equipped with a retaining key that connects to the joint in a retaining state,
The main body is provided with an opening that can be used to insert and remove the retaining key from the keyway.
The retaining key is provided with a key portion arranged in the key groove.
The main body is provided with a communication hole that communicates with the inward recess.
An abutment member can be installed in the communication hole so that a part thereof is located at least in the inward recess.
A protective cap configured so that the key portion abuts on the part of the abutting member to prevent the retaining key from moving further into the keyway.
前記抜止キーは、前記キー部の一端に一体的に形成され、該キー部を前記キー溝内に配置したときに前記開口部の正面視における左右の縁面に接触する係止部が更に設けられてあり、
前記係止部は、前記左右の縁面のうち、前記本体部の径方向に沿うような方向における、内側寄りの部分に接触するような長さに構成されている請求項1に記載の保護キャップ。
The retaining key is integrally formed at one end of the key portion, and is further provided with a locking portion that contacts the left and right edge surfaces of the opening in front view when the key portion is arranged in the key groove. Has been
The protection according to claim 1, wherein the locking portion is configured to have a length that contacts an inward portion of the left and right edge surfaces in a direction along the radial direction of the main body portion. cap.
前記抜止キーは、前記キー部の一端に一体的に形成され、該キー部を前記キー溝内に配置したときに前記開口部の正面視における左右の縁面に接触する係止部が更に設けられてあり、
前記係止部は、前記左右の縁面のうち、前記本体部の径方向に沿うような方向における、外側寄りの部分に接触するような長さに構成されるとともに、前記本体部の軸心方向に沿うような方向における、厚みが、前記本体部の径方向に沿うような方向における、内側の基端部から、前記本体部の径方向に沿うような方向における、外側の先端部に至るにつれて薄くなるように構成されている請求項1に記載の保護キャップ。
The retaining key is integrally formed at one end of the key portion, and is further provided with a locking portion that contacts the left and right edge surfaces of the opening in front view when the key portion is arranged in the key groove. Has been
The locking portion is configured to have a length that contacts the outer portion of the left and right edge surfaces in a direction along the radial direction of the main body portion, and the axial center of the main body portion. From the inner base end portion in the direction along the direction, in the direction in which the thickness is along the radial direction of the main body portion, to the outer tip portion in the direction along the radial direction of the main body portion. The protective cap according to claim 1, which is configured to become thinner as it increases.
前記開口部の正面視における左右の縁面は互いに正対するように構成され、
前記抜止キーは、前記キー部の一端に一体的に形成され、該キー部を前記キー溝内に配置したときに前記開口部の正面視における左右の縁面に接触する係止部が更に設けられてあり、
前記係止部は、前記左右の縁面との対向面が、該左右の縁面と面接触するように構成されている請求項1に記載の保護キャップ。
The left and right edge surfaces of the opening in front view are configured to face each other.
The retaining key is integrally formed at one end of the key portion, and is further provided with a locking portion that contacts the left and right edge surfaces of the opening in front view when the key portion is arranged in the key groove. Has been
The protective cap according to claim 1, wherein the locking portion is configured such that the surface facing the left and right edge surfaces is in surface contact with the left and right edge surfaces.
前記開口部の前記左の縁面の側に配置された前記抜止キーと、前記開口部の前記右の縁面の側に配置された前記抜止キーとの間に配置され、
前記左右一対の抜止キーが、前記開口部から脱落することを防止する脱落防止部材が備えられ、
前記係止部に、前記脱落防止部材が前記開口部から脱落することを防止する脱落防止機構が備えられ、
前記脱落防止機構は、前記係止部の、前記本体部の径方向に沿うような方向における、外側の先端部に、前記脱落防止部材の、前記本体部の径方向に沿うような方向における、外側の表面に接触するように設けられた掛止部から構成されている請求項2から4のいずれか一項に記載の保護キャップ。
It is arranged between the retaining key arranged on the side of the left edge surface of the opening and the retaining key arranged on the side of the right edge surface of the opening.
A dropout prevention member is provided to prevent the pair of left and right retaining keys from falling off from the opening.
The locking portion is provided with a dropout prevention mechanism for preventing the dropout prevention member from falling out of the opening.
The fall-off prevention mechanism is provided at the outer tip portion of the locking portion in a direction along the radial direction of the main body portion, and in a direction along the radial direction of the main body portion of the fall-off prevention member. The protective cap according to any one of claims 2 to 4, which is composed of a hook portion provided so as to come into contact with an outer surface.
前記開口部の前記左の縁面の側に配置された前記抜止キーのキー部と、前記開口部の前記右の縁面の側に配置された前記抜止キーのキー部とを連結する連結部材が備えられている請求項1から5のいずれか一項に記載の保護キャップ。 A connecting member that connects the key portion of the retaining key arranged on the left edge surface side of the opening and the key portion of the retaining key arranged on the right edge surface side of the opening. The protective cap according to any one of claims 1 to 5, wherein the protective cap is provided.
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