JP2020020113A - Protection cap detachable on steel pipe pile and steel pile sheet plate - Google Patents

Abstract

To provide a protection cap of which an anti-loosening key has no risk to be broken.SOLUTION: A protection cap is provided with: a body part 41; and an anti-loosening key 5 arranged in a key groove comprising an inward groove part 44 in the body part 41 and an outward groove part 32 in a pin joint 3 to connect the protection cap 4 and the pin joint 3 in an anti-loosening state, wherein the body part 41 is provided with an opening 45 usable when the anti-loosening key 5 is inserted into the key groove, and the anti-loosening key 5 is provided with a key part 51 arranged in a key groove and an engaging part 52 integrally formed at an end of the key part 51 and contacting right and left edge surfaces 45L, 45R of the opening 45 in a front view when the key part 51 is placed in the key groove, and the engaging part 52 is configured to be long enough to contact on a part near an inner side in a direction along a radial direction of the body part 41 among the right and left edge surfaces 45L, 45R.SELECTED DRAWING: Figure 3

Description

  The present invention is provided for a steel pipe pile / steel pipe sheet pile to be driven in at the time of driving in a steel pipe pile / steel pipe sheet pile that is configured to be connectable in the longitudinal direction by a pin joint and a box joint separately provided at an end of the steel pipe. The present invention also relates to a protective cap detachable from the pin joint.

  Conventionally, steel pipe piles and steel sheet piles have been connected by welding and joining each single pipe carried to the construction site. In recent years, mechanical joints capable of rapid construction have been adopted for connecting steel pipe piles and steel pipe sheet piles instead of welding.

  As disclosed in Patent Literature 1, the mechanical joint includes a pin joint, a box joint, a load transmission key, and the like provided at an end of a steel pipe.

  The box joint is provided with an inward groove on its inner peripheral surface, and the pin joint is provided with an outward groove at a position facing the inward groove 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 and the outward groove. By arranging as described above, the joint member is integrated and the two steel pipes are connected.

  Steel pipe piles and sheet piles are driven in by the vibration method, the rotating method, the digging method and the pre-boring method. For example, in the vibration method, a vibratory hammer applies vibration to the ground and presses it into the ground.Therefore, if a mechanical joint provided on a steel pipe pile or a steel pipe sheet pile is directly gripped by a vibro chuck suspended from a crane, the mechanical joint May be deformed, which may hinder normal connection. Therefore, in order to avoid this, a protective cap called Yatco is used. The protective cap is removed after the completion of the driving.

  The protective cap has a body portion that can be attached to and detached from the pin joint, and has an inner peripheral surface in which the pin joint can be just inserted into the body portion, and the inner peripheral surface faces inward at a position corresponding to the outward groove of the pin joint. A groove is provided. By inserting the retaining key from the outside of the protection cap through the opening provided in the main body and arranging it so as to straddle the inward groove and the outward groove provided in the pin joint, the protection cap The pin joint is mechanically connected.

  The retaining key has an arc-shaped key portion disposed in a key groove formed of an inward groove portion and an outward groove portion, and is integrally formed at one end of the key portion. A lock portion for preventing 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 portion when viewed from the front when arranged in I have. When the retaining key is removed, the retaining key can be used to easily pull out the retaining key from the key groove.

JP 2006-011225 A

  By the way, at the time of the above-described driving work, a large load is applied to the retaining key in order to prevent the protection cap and the pin joint from being removed. At this time, a large load acts on the locking portion from the left and right edge surfaces that come into contact with the locking portion and the upper and lower edge surfaces when the opening is viewed from the front. Due to this load, for example, a bending moment is generated at a boundary portion between the key portion and the locking portion, and there is a possibility that the bending portion may be damaged at the boundary portion.

  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 that does not cause breakage of a retaining key.

  In order to achieve the above-mentioned object, the characteristic configuration of the protective cap according to the present invention is a steel pipe pile / steel pipe configured to be connectable in the longitudinal direction by a pin joint and a box joint distributed to the end of the steel pipe. A protective cap detachable from the pin joint provided on the steel pipe pile / steel pipe sheet pile to be driven when the sheet pile is driven in, and may surround at least a portion of the pin joint provided with an outward concave portion. The protection is achieved by being arranged in a key groove including a main body, an inward recess provided at a position facing the outward recess on the inner peripheral surface of the main body, and the outward recess. A locking key for connecting the cap and the pin joint in a locking state, wherein the main body is provided with an opening which can be used when inserting and removing the locking key with respect to the key groove. The key is formed integrally with one end of the key portion disposed in the key groove, and the opening portion is viewed from the front when the key portion is disposed in the key groove. A locking portion that contacts left and right edge surfaces, wherein the locking portion contacts an inner side portion of the left and right edge surfaces in a direction along a radial direction of the main body portion. The point is that it is configured to have such a length.

  According to the above configuration, the locking portion comes into contact with the upper and lower edge surfaces of the opening in a front view at a portion closer to the inside in a direction along the radial direction of the main body. Due to the short length of the locking part, the bending moment generated by the force received from the left and right edges and the upper and lower edges at the boundary between the key and the locking part during the driving work On the other hand, in the direction along the radial direction of the main body portion, the amount is reduced as compared with the case where the outer side portion is contacted. Since the stress concentrated on the locking portion is reduced in this way, the durability of the retaining key is improved. And, by improving the durability performance of the retaining key, breakage at the time of construction hardly occurs, and as a result, the economic efficiency is improved.

  In order to achieve the above-mentioned object, the characteristic configuration of the protective cap according to the present invention is a steel pipe pile / steel pipe configured to be connectable in the longitudinal direction by a pin joint and a box joint distributed to the end of the steel pipe. A protective cap detachable from the pin joint provided on the steel pipe pile / steel pipe sheet pile to be driven when the sheet pile is driven in, and may surround at least a portion of the pin joint provided with an outward concave portion. The protection is achieved by being arranged in a key groove including a main body, an inward recess provided at a position facing the outward recess on the inner peripheral surface of the main body, and the outward recess. A locking key for connecting the cap and the pin joint in a locking state, wherein the main body is provided with an opening which can be used when inserting and removing the locking key with respect to the key groove. The key is formed integrally with one end of the key portion disposed in the key groove, and the opening portion is viewed from the front when the key portion is disposed in the key groove. A locking portion that contacts left and right edge surfaces, wherein the locking portion contacts an outer side portion of the left and right edge surfaces in a direction along a radial direction of the main body portion. The main body portion has a thickness in a direction along the axial direction of the main body portion and a thickness in a direction along the radial direction of the main body portion. The point is that it is configured so as to become thinner toward the outer end portion in a direction along the radial direction of the portion.

  As described above, if the locking portion of the retaining key is configured to be thin from the base end to the distal end, the locking portion does not contact the upper and lower edge surfaces of the opening. Therefore, at the time of driving, the boundary 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 reduced, the durability of the retaining key is improved. And, by improving the durability performance of the retaining key, breakage at the time of construction hardly occurs, and as a result, the economic efficiency is improved.

  In order to achieve the above-mentioned object, the characteristic configuration of the protective cap according to the present invention is a steel pipe pile / steel pipe configured to be connectable in the longitudinal direction by a pin joint and a box joint distributed to the end of the steel pipe. A protective cap detachable from the pin joint provided on the steel pipe pile / steel pipe sheet pile to be driven when the sheet pile is driven in, and may surround at least a portion of the pin joint provided with an outward concave portion. The protection is achieved by being arranged in a key groove including a main body, an inward recess provided at a position facing the outward recess on the inner peripheral surface of the main body, and the outward recess. A locking key for connecting the cap and the pin joint in a locking state, wherein the main body is provided with an opening which can be used when inserting and removing the locking key with respect to the key groove. The left and right edge surfaces of the opening in a front view are configured to face each other, and the retaining key is integrally formed at one end of the key with a key disposed in the key groove, A locking portion that contacts the left and right edge surfaces when the key portion is disposed in the key groove; and the locking portion has a surface facing the left and right edge surfaces. In that it is configured to be in surface contact with the edge surface of the.

  According to the above-described configuration, the locking portion of the retaining key is configured such that the surfaces facing the left and right edge surfaces are in surface contact with the left and right edge surfaces. The bending moment caused by the distributed load received from the contact portion is reduced as compared with the case where a concentrated load acts on the distal end portion of the locking portion. Since the stress concentrated on the locking portion is reduced in this way, the durability of the retaining key is improved. And, by improving the durability performance of the retaining key, breakage at the time of construction hardly occurs, and as a result, the economic efficiency is improved.

  In the present invention, the locking portion has a thickness in a direction along the axial direction of the main body portion, and a thickness in the direction along the radial direction of the main body portion, from the inner base end portion to the main body portion. It is preferable that the thinner portion is configured to become thinner toward the outer tip portion in a direction along the radial direction of the portion.

  As described above, if the locking portion of the retaining key is configured to be thin from the base end to the distal end, the locking portion does not contact the upper and lower edge surfaces of the opening. Therefore, the boundary 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 reduced, the durability of the retaining key is improved. And, by improving the durability performance of the retaining key, breakage at the time of construction hardly occurs, and as a result, the economic efficiency is improved.

  In the present invention, the retaining key disposed on the side of the left edge of the opening and the retaining key disposed on the side of the right edge of the opening, A stopper for preventing the pair of left and right retaining keys from falling off from the opening is provided, and a stopper for preventing the stopper from falling off from the opening is provided on the locking portion. The falling-off prevention mechanism is provided on the outer tip of the locking portion, in a direction along the radial direction of the main body, such that the falling-off prevention member extends along the radial direction of the main body. It is preferable that it comprises a hook provided to contact the outer surface in the direction.

  A drop-off preventing member is disposed between the pair of locking keys arranged in both the left and right directions from the opening to prevent the pair of locking keys from dropping out, but this drop-out preventing member falls off. Then, there is a possibility that the pair of retaining keys may fall off. According to the above configuration, the locking portion provided at the distal end of the locking portion prevents the falling-off prevention member from falling off. As a result, the pair of locking keys is prevented from falling off.

  In the present invention, the key portion of the retaining key disposed on the left edge side of the opening, and the key portion of the retaining key disposed on the right edge side of the opening. It is preferable that a connecting member for connecting is provided.

  According to the above-described configuration, even if the boundary 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 is moved by the connecting member in the circumferential direction of the steel pipe in the key groove. Is prevented from moving.

  In order to achieve the above-mentioned object, the characteristic configuration of the protective cap according to the present invention is a steel pipe pile / steel pipe configured to be connectable in the longitudinal direction by a pin joint and a box joint provided at the end of the steel pipe. A protective cap detachable from the pin joint provided on a steel pipe pile / steel pipe sheet pile to be driven when driving a sheet pile, and may surround at least a portion of the pin joint provided with an outward concave portion. The protection is achieved by being disposed in a key groove including a main body, an inward recess provided at a position on the inner peripheral surface of the main body facing the outward recess, and the outward recess. A locking key for connecting the cap and the pin joint in a locking state, wherein the main body is provided with an opening which can be used when inserting and removing the locking key with respect to the key groove. A key portion disposed in the key groove, the communication hole communicating with the inward concave portion is provided in the main body portion, and a part of the communication hole is provided in the communication hole. Is configured to be able to be installed at least so as to be located in the inward concave portion, and the key portion abuts on the part of the impact member so that the retaining key is located deeper than the key groove. Is configured to be prevented from moving.

  According to the above-described configuration, when the stopper member is installed in the communication hole, a part of the stopper member is located in the key groove. 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 removal key can be taken out by removing the stopper member from the communication hole and, for example, pushing back the key portion of the removal key with a jig inserted through the communication hole.

Explanatory drawing of a protective cap and a pin joint according to an embodiment of the present invention. FIG. 2 is a side sectional view of a main part of the protective cap shown in FIG. 1. FIG. 2 is a cross-sectional plan view of a main part of the protective cap shown in FIG. FIG. 4 is a plan sectional view of a protective cap having a retaining key according to another embodiment of the present invention. Side sectional view of a protective cap having a retaining key according to another embodiment of the present invention. FIG. 4 is a plan sectional view of a protective cap having a retaining key according to another embodiment of the present invention. Explanatory drawing of drop-out prevention member Explanatory drawing of connecting member Explanatory drawing of a protective cap according to another embodiment of the present invention.

  Hereinafter, an embodiment of a protective cap detachable from a steel pipe pile and a steel pipe sheet pile according to the present invention will be described with reference to the drawings. FIG. 1 shows the protective cap 4 and a part of the steel pipe pile 1.

  The steel pipe pile 1 is configured to be connectable in the longitudinal direction by a pin joint 3 provided separately to an end of the steel pipe 2 and a box joint (not shown). In addition, the steel pipe 2 may be a welded pipe such as a spiral steel pipe or a UO steel pipe, a seamless steel pipe, a forged steel pipe, a cast steel pipe, or the like, and the pin joint 3 and the box joint are joined to an end of the steel pipe 2 by welding. .

  The pin joint 3 is provided with a single outward groove 32 along the circumferential direction at a position on the outer peripheral surface 31 opposite to an inward groove provided in a box joint (not shown). The outward groove 32 is an outward concave according to the present invention. The pin joint 3 and the box joint are prevented from falling off by disposing the load transmitting key so as to straddle the key groove formed by the outward groove 32 and the inward groove.

  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 disposing the rotation inhibiting key 35 so as to straddle the key groove formed by the pin-side recess 34 and the box-side recess, the pin joint 3 and the box joint are prevented from rotating.

  When such a steel pipe pile 1 is driven into the ground by vibrating construction while being vibrated by a vibratory hammer, the pin joint 3 and the box joint of the steel pipe pile 1 are directly gripped by a vibro chuck suspended on a crane. In order to avoid this, a protective cap 4 according to the invention is used.

  The protective cap 4 has a cylindrical main body 41 that can surround the outer peripheral surface 31 of the pin joint 3 where the outward groove 32 is provided. Therefore, the steel pipe 2, the pin joint 3, and the main body 41 have the same axial center.

  An inward groove 44 is provided on the inner peripheral surface 42 of the main body 41 at a position facing the outward groove 32 of the pin joint 3. This inward groove portion 44 is an inward concave portion according to the present invention. An opening 45 communicating with the inward groove 44 is provided in the main body 41 of the protective cap 4.

  As shown in FIGS. 2 and 3, the opening 45 is configured such that left and right edge surfaces 45L and 45R in front view of the opening 45 face each other, and upper and lower edge surfaces 45T and 45B are opposite to each other. It is configured to:

  As shown in FIGS. 1 to 3, the protection cap 4 is provided with a retaining key 5 that is disposed over a key groove including the inward groove portion 44 and the outward groove portion 32 and that prevents the pin joint 3 from coming off. .

  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.

  When the key portion 51 is disposed in a key groove formed by the inward groove portion 44 and the outward groove portion 32, the locking portion 52 is provided on the left edge surface 45L or the right edge surface 45R of the opening 45. Contact.

  At this time, the retaining key 5 according to the present embodiment extends in the radial direction of the main body 41 from the inner base end 52B in the direction along the length of the locking portion 52, that is, the radial direction of the main body 41. The length of the key portion 51 in the direction along the outer tip 52T is about 40% of the thickness in the direction along the axis of the main body 41. The distal end portion of the locking portion 52 comes into contact with a portion of the left and right edge surfaces 45L and 45R that is closer to the inside in a direction along the radial direction of the main body portion 41.

  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: The upper and lower edge surfaces 45T and 45B are reduced as compared with a case where the upper and lower edge surfaces 45T and 45B are in contact with portions closer to the outside in a direction along the radial direction of the main body 41. Since the stress concentrated on the locking portion 52 is reduced in this manner, the durability of the retaining key 5 is improved. In addition, since the durability of the retaining key 5 is improved, damage during construction is less likely to occur, and as a result, economy is improved.

  The retaining key 5 thus configured is disposed so as to straddle the key groove formed by the outwardly facing groove portion 32 and the inwardly facing groove portion 44, so that the pin joint 3 and the protective cap 4 are prevented from coming off. Become.

  By the way, as in the related art, the locking portion 52 of the retaining key 5 has such a length as to reach the vicinity of the outer surface of the opening 45 in a direction along the radial direction of the main body 41. When the retaining key 5 is removed from the key groove, the locking portion can be gripped or the like, so that workability is good. However, when the locking portion 52 of the retaining key 5 is short, there is a problem that the retaining key 5 is located deep in the opening portion 45 so that it is difficult to grip or the like, and therefore the retaining key 5 is difficult to be taken out.

  Therefore, the engaging 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 arranged in the key groove while the dulling iron wire 54 or the binding band is previously inserted into the through hole 53 provided in the locking part 52, the dulling iron wire is used when the retaining key 5 is removed. 54 and the binding band can be gripped, so that the retaining key 5 can be easily taken out. However, the through-hole 53 does not need 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 with the circumferential direction of the main body portion 41. . Further, the through hole 53 is not an essential component of the retaining key 5.

  The protective cap 4 is provided with a cap-side recess 48 at a position on the edge surface of the outer peripheral surface 43 opposite to the pin-side recess 34 provided in the pin joint 3. The above-described rotation prevention key 35 is arranged so as to straddle the key groove formed by the pin-side recess 34 and the cap-side recess 48, whereby the pin joint 3 and the protection cap 4 are prevented from rotating.

  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 denoted by the same reference numerals, and description thereof will be omitted.

  In the embodiment shown in FIGS. 4 and 5, the retaining key 6 is provided with an arc-shaped 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 such that the locking portion 62 contacts a portion closer to the outside in the direction along the radial direction of the main body portion 41 between the left and right edge surfaces 45L and 45R. In the direction along the radial direction, the thickness is from the inner base end 62B in the direction along the radial direction of the main body portion 41, and the outer distal end portion in the direction along the radial direction of the main body portion 41. It is configured to become thinner as it reaches 62T.

  When the locking portion 62 of the retaining key 6 is configured such that the thickness is reduced from the base end portion 62B to the distal end portion 62T, the locking portion 62 is positioned 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, the boundary 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 reduced, the durability of the retaining key 6 is improved. In addition, since the durability of the retaining key 6 is improved, breakage during construction is less likely to occur, and as a result, economy is improved.

  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 such a length as to be in contact with a portion of the left and right edge surfaces 45L and 45R that is closer to the outside in a direction along the radial direction of the main body portion 41, and has the locking portion 72. Is configured such that a surface 73 facing the left and right edge surfaces 45L and 45R is in surface contact with the left and right edge surfaces 45L and 45R.

  Accordingly, at the time of driving, the bending moment generated in the locking portion 72 due to the distributed load received by the opposing surface 73 from the left and right edge surfaces 45L, 45R causes the concentrated load to act 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 reduced in this manner, the durability of the retaining key 7 is improved. In addition, since the durability of the retaining key 7 is improved, breakage during construction is less likely to occur, and as a result, economy is improved.

  In this embodiment, the locking portion 72 has a thickness in a direction along the axial direction of the main body portion 41 and a thickness from the inner base end portion 72B in a direction along the radial direction of the main body portion 41. It may be configured such that it becomes thinner toward the outer end portion 72T in a direction along the radial direction of the main body portion 41.

  When the locking portion 72 of the retaining key 7 is configured so that the thickness is reduced from the base end portion 77B to the distal end portion 77T, the locking portion 72 is moved with respect to the upper and lower edge surfaces 45T and 45B of the opening 45. Do not touch. Therefore, the boundary 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 reduced, the durability of the retaining key 7 is improved. In addition, since the durability of the retaining key 7 is improved, breakage during construction is less likely to occur, and as a result, economy is improved.

  In any of the embodiments described above, the protective cap 4 may be provided with the falling-off prevention member 10. As shown in FIG. 7, the drop-off preventing member 10 includes a retaining key 8L disposed on the left edge surface 45L of the opening 45 and a retaining key 8L disposed on the right edge surface 45R of the opening 45. 8R, and prevents the pair of left and right retaining keys 8L, 8R from dropping out of the opening 45. The falling-off preventing member 10 is capable of absorbing an impact load, and is shaped when the load is removed, such as a low-resilience soft foam such as sponge rubber or a low-resilience soft material such as rubber, plastic, or wood. Is preferably made of an elastic body that returns to its original state. Although the retaining keys 8L and 8R are separately referred to for convenience of description, they are retaining keys having the same configuration. Therefore, the same description holds even if both are switched.

  At this time, the locking portions 82L and 82R may be provided with a drop-off preventing mechanism for preventing the drop-off preventing member 10 from dropping out of the opening 45. The drop-off prevention mechanism is provided at a tip end of each of the locking portions 82L and 82R so as to come into contact with an outer surface of the drop-out prevention member 10 in a direction along the radial direction of the main body 41. 83L and 83R. The locking portions 83L and 83R provided at the distal ends of the locking portions 82L and 82R prevent the falling-off preventing member 10 from falling off, and as a result, the pair of retaining keys 8L and 8R from falling off.

  As shown in FIG. 8, the protective cap 4 has a key portion 91L of the retaining key 9L arranged on the left edge surface 45L side of the opening 45 and a right edge surface 45R side of the opening 45. A connecting member 11 that connects the key portion 91R of the arranged retaining key 9R may be provided. As the connection member 11, a tension spring having a spring constant of about 0.1 to 1 N / mm or a dull iron wire can be preferably exemplified. Although the retaining keys 9L and 9R are separately referred to for convenience of description, the retaining keys have the same configuration. Therefore, the same description holds even if both are switched.

  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 having lost the locking portions are located in the key grooves by the connecting member. In this case, movement in the circumferential direction of the steel pipe 2 is prevented.

  Also in this embodiment, a falling-off prevention member 10 as shown in FIG. 7 may be provided between the retaining key 9L and the retaining key 9R.

  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 falling out of the key groove via the opening 45.

  In addition, the connection of the protective cap 4 to the steel pipe pile 1 is easily released by removing the retaining key 5 through the opening 45, whereby the protective cap 4 can be removed from the steel pipe pile 1.

  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 denoted by the same reference numerals, and description thereof will be omitted.

  As shown in FIG. 9, in the present embodiment, the retaining key 12 of the protection cap 4 includes only an arc-shaped key portion.

  The communication hole 13 communicating with the inward groove 44 is provided in the main body 41 of the protective cap 4.

  An impact member 14 can be installed in the communication hole 13. The stop member 14 is a bolt-shaped member in the present embodiment, and the stop member 14 and the communication hole 13 are formed with screws that screw together. However, the screw may not be formed in the stopper member 14 and the communication hole 13. In this case, the stop member 14 is attached to the communication hole 13 by bonding or welding.

  The impact member 14 is configured such that a part thereof is located at least in the inward groove portion 44 when installed in the communication hole 13. The key portion of the retaining key 12 abuts against a part of the stopper member 14, and the retaining key 12 is prevented from moving further into the key groove. The communication hole 13 is provided at an appropriate position in accordance with the length of the retaining key 12 in a direction along the circumferential direction of the main body portion 41, for example, the key portion of the retaining key 12 contacts a part of the stopper member 14. Even when touched, the retaining key 12 is provided at a position where a part of the key 12 can be seen from the opening 45.

  The removal key 12 can be taken out by removing the stopper member 14 from the communication hole 13 and pushing back the key portion of the removal key 12 with a jig inserted into the communication hole 13, for example. However, also in the present embodiment, the retaining portion may be provided on the retaining key 12 as in the above-described embodiment.

  The number of outward groove portions 32 provided in the pin joint of the steel pipe pile 1 to which the protective cap 4 according to the present invention is to be attached / detached is not limited to one. There may be two or more articles. The protective cap 4 may also have a plurality of inward grooves 44 corresponding thereto. Note that the inward concave portion and the outward concave portion are not limited to grooves.

  In each of the above-described embodiments, the case where the steel pipe pile 1 to which the protective cap 4 according to the present invention is to be attached / detached is driven and driven by the vibration method, but is not limited thereto. The protective cap 4 according to the present invention can also be used when the steel pipe pile 1 is driven in by a method such as a rotary method, a middle digging method, and a pre-boring method.

  Each of the embodiments described above is an example of the present invention, and the present invention is not limited by the description, and the specific configuration of each unit can be appropriately changed and designed within a range in which the effects of the present invention are exerted. It is.

1: steel pipe pile 2: steel pipe 3: pin joint 4: protective cap 5: retaining key 6: retaining key 7: retaining key 8: retaining key 9: retaining key 10: falling-off prevention member 11: connecting member 12: retaining key 13: Through hole 14: Stop member 41: Main body 42: Inner peripheral surface 44: Inward groove (inward recess)
45: Opening 45B: Upper edge 45L: Left edge 45R: Right edge 45T: Lower edge 51: Key 52: Locking portion 52B: Base 52T: Tip 61: Key 62: Locking portion 62B: Base end portion 62T: Tip portion 71: Key portion 72: Locking portion 72B: Base end portion 72T: Tip portion 73: Opposing surface 77B: Base end portion 77T: Tip end portion 82L: Locking portion 82R: locking part 83L: locking part 83R: locking part 91L: key part 91R: key part 92L: locking part 92R: locking part

Claims (7)

The pin joint provided in the steel pipe pile / steel pipe sheet pile to be driven during the driving work of the steel pipe pile / steel pipe sheet pile that is configured to be connectable in the longitudinal direction by the pin joint and the box joint distributed to the end of the steel pipe. A removable protective cap,
A body portion that can surround at least a portion of the pin joint where an outward concave portion is provided,
The protective cap and the pin are arranged in a key groove including an inward concave portion provided at a position facing the outward concave portion on the inner peripheral surface of the main body portion and the outward concave portion. A lock key for connecting the joint with the lock in a locked state,
The main body portion has an opening that can be used when inserting and removing the retaining key with respect to the key groove,
The retaining key is integrally formed at one end of the key portion with the key portion disposed in the key groove, and when the key portion is disposed in the key groove, the left and right sides of the opening portion are viewed from the front. And a locking portion that contacts the edge surface of the
The protection cap is configured to have a length such that the locking portion is in contact with a portion closer to an inner side of the left and right edge surfaces in a direction along a radial direction of the main body. The pin joint provided in the steel pipe pile / steel pipe sheet pile to be driven during the driving work of the steel pipe pile / steel pipe sheet pile that is configured to be connectable in the longitudinal direction by the pin joint and the box joint distributed to the end of the steel pipe. A removable protective cap,
A body portion that can surround at least a portion of the pin joint where an outward concave portion is provided,
The protective cap and the pin are arranged in a key groove including an inward concave portion provided at a position facing the outward concave portion on the inner peripheral surface of the main body portion and the outward concave portion. A lock key for connecting the joint with the lock in a locked state,
The main body portion has an opening that can be used when inserting and removing the retaining key with respect to the key groove,
The retaining key is integrally formed at one end of the key portion with the key portion disposed in the key groove, and when the key portion is disposed in the key groove, the left and right sides of the opening portion are viewed from the front. And a locking portion that contacts the edge surface of the
The locking portion is configured to have a length such that it contacts a portion closer to the outside of the left and right edge surfaces in a direction along the radial direction of the main body, and the axis of the main body. In the direction along the direction, the thickness ranges from the inner base end in the direction along the radial direction of the main body portion to the outer end portion in the direction along the radial direction of the main body portion. A protective cap that is configured to become thinner as it becomes thinner. The pin joint provided in the steel pipe pile / steel pipe sheet pile to be driven during the driving work of the steel pipe pile / steel pipe sheet pile that is configured to be connectable in the longitudinal direction by the pin joint and the box joint distributed to the end of the steel pipe. A removable protective cap,
A body portion that can surround at least a portion of the pin joint where an outward concave portion is provided,
The protective cap and the pin are arranged in a key groove including an inward concave portion provided at a position facing the outward concave portion on the inner peripheral surface of the main body portion and the outward concave portion. A lock key for connecting the joint with the lock in a locked state,
The main body portion has an opening that can be used when inserting and removing the retaining key with respect to the key groove,
Left and right edge surfaces in front view of the opening are configured to face each other,
The retaining key is formed integrally with a key portion disposed in the key groove and one end of the key portion, and comes into contact with the left and right edge surfaces when the key portion is disposed in the key groove. A locking portion is provided,
A protective cap, wherein the locking portion is configured such that a surface facing the left and right edge surfaces is in surface contact with the left and right edge surfaces.   The locking portion has a thickness in a direction along the axial direction of the main body portion, a thickness in a direction along the radial direction of the main body portion, and a radial direction of the main body portion from an inner base end portion. 4. The protective cap according to claim 3, wherein the protective cap is configured so as to become thinner toward an outer tip portion in a direction along the direction. The retaining key arranged on the left edge side of the opening and the retaining key arranged on the right edge side of the opening,
The pair of left and right retaining keys is provided with a falling-off preventing member for preventing the key from falling off from the opening,
The locking portion is provided with a fall-off prevention mechanism for preventing the fall-off prevention member from falling off from the opening.
The fall-off prevention mechanism is configured such that, in the direction along the radial direction of the main body, the locking portion, at the outer tip, in the direction along the radial direction of the main body, The protective cap according to any one of claims 1 to 4, wherein the protective cap comprises a hook portion provided so as to contact an outer surface.   A connecting member for connecting the key portion of the retaining key disposed on the left edge side of the opening and the key portion of the retaining key disposed on the right edge side of the opening. The protective cap according to any one of claims 1 to 5, further comprising: The pin joint provided in the steel pipe pile / steel pipe sheet pile to be driven during the driving work of the steel pipe pile / steel pipe sheet pile that is configured to be connectable in the longitudinal direction by the pin joint and the box joint distributed to the end of the steel pipe. A removable protective cap,
A body portion that can surround at least a portion of the pin joint where an outward concave portion is provided,
The protective cap and the pin are arranged in a key groove including an inward concave portion provided at a position facing the outward concave portion on the inner peripheral surface of the main body portion and the outward concave portion. A lock key for connecting the joint with the lock in a locked state,
The main body portion has an opening that can be used when inserting and removing the retaining key with respect to the key groove,
The retaining key is provided with a key portion arranged in the key groove,
A communication hole communicating with the inward concave portion is provided in the main body,
The communication hole is configured such that a stop member can be installed such that a part thereof is located at least in the inward concave portion,
A protective cap configured to prevent the key from being moved further into the key groove by contacting the key portion with the part of the impact member.

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