JP7145677B2 - Detachable protective cap for steel pipe piles and steel pipe sheet piles - Google Patents

Description

INDUSTRIAL APPLICABILITY The present invention is provided for steel pipe piles and steel pipe sheet piles that are driven into steel pipe piles and steel pipe sheet piles that are configured to be connectable in the longitudinal direction by means of pin joints and box joints distributed at the ends of steel pipes. and a protective cap detachable from the pin joint.

Conventionally, steel pipe piles and steel pipe sheet piles have been connected by welding and joining the individual pipes brought to the construction site. In recent years, instead of welding joints, mechanical joints that can be rapidly constructed have been adopted for connecting steel pipe piles and steel pipe sheet piles.

As disclosed in Patent Literature 1, this mechanical joint is composed of a pin joint, a box joint, a load transmission key, and the like provided separately at the ends 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 is straddled between the inward groove and the outward groove. By arranging them in this way, the joint members are integrated and the two steel pipes are connected.

Steel pipe piles and steel pipe sheet piles are driven by methods such as the vibration method, rotary method, inner excavation method, and pre-boring method. For example, in the vibration method, vibration is applied by a vibrating hammer while the ground is pressed into the ground. may deform and interfere with normal connection. To avoid this, a protective cap called yatko is used. The protective cap is removed after the placement is completed.

The protective cap has a main body that can be attached to and removed from the pin joint, and has an inner peripheral surface into which the pin joint can be just inserted. 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 arranged so as to straddle the inward groove and the outward groove provided in the pin joint, thereby separating the protective cap and The pin joint is mechanically connected.

The retainer key is formed integrally with an arc-shaped key portion disposed in a key groove composed of an inward groove portion and an outward groove portion, and one end of the key portion. and a locking portion that prevents the key portion from moving in the circumferential direction of the steel pipe in the key groove by coming into contact with the left and right edge surfaces of the opening when viewed from the front when the key is placed in the there is When removing the retaining key, the locking portion can be used to easily pull the retaining key out of the keyway.

JP 2006-011225 A

By the way, during the driving work as described above, a large load is applied to the retaining key for retaining 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 therewith and from the upper and lower edge surfaces of the opening when viewed from the front. 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 breakage at the boundary portion.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a protective cap in which there is no risk of breakage of a retaining key.

In order to achieve the above object, the protective cap according to the present invention is characterized by a steel pipe pile/steel pipe configured to be connectable in the longitudinal direction by means of pin joints and box joints separately provided at the ends of steel pipes. 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 during the driving of the sheet pile, and can surround at least a portion of the pin joint provided with an outward concave portion. By being arranged in a key groove composed of 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, the protection a retaining key that connects the cap and the pin joint in a retaining state, the main body portion is provided with an opening that can be used when the retaining key is inserted into or removed from the key groove, and The retainer key is formed integrally with a key portion arranged in the key groove and one end of the key portion, and when the key portion is arranged in the key groove, the left and right sides of the opening when viewed from the front. A locking portion that contacts the edge surface is provided, and the locking portion contacts only an inner portion of the left and right edge surfaces in a direction along the 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 contacts the upper and lower edge surfaces of the opening when viewed from the front only at the inner portion in the direction along the radial direction of the main body. 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 hammering work is On the other hand, it is reduced compared to the case of contacting the portion closer to the outside in the direction along the radial direction of the body portion. Since the stress concentrated on the engaging portion is alleviated in this manner, the durability of the retainer key is improved. Further, by improving the durability of the retainer key, it is less likely to be damaged during installation, and as a result, the economic efficiency is improved.

In order to achieve the above object, the protective cap according to the present invention is characterized by a steel pipe pile/steel pipe configured to be connectable in the longitudinal direction by means of pin joints and box joints separately provided at the ends of steel pipes. 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 during the driving of the sheet pile, and can surround at least a portion of the pin joint provided with an outward concave portion. By being arranged in a key groove composed of 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, the protection a retaining key that connects the cap and the pin joint in a retaining state, the main body portion is provided with an opening that can be used when the retaining key is inserted into or removed from the key groove, and The retainer key is formed integrally with a key portion arranged in the key groove and one end of the key portion, and when the key portion is arranged in the key groove, the left and right sides of the opening when viewed from the front. An engaging portion that contacts the edge surface is provided, and the engaging portion is arranged to contact an outer portion of the left and right edge surfaces in a direction along the radial direction of the main body portion. length, and the thickness in the direction along the axial direction of the main body portion extends from the inner base end portion in the direction along the radial direction of the main body portion to the main body portion. The point is that it is configured so that it becomes thinner as it reaches the outer tip portion in a direction along the radial direction.

As described above, if the locking portion of the retaining key is configured so that the thickness decreases from the proximal end to the distal end, the locking portion does not come into contact with the upper and lower edge surfaces of the opening. Therefore, the boundary between the key portion and the engaging portion does not receive a load from at least the upper and lower edge surfaces of the opening during driving. The durability of the retaining key is improved because the stress concentrated on the locking portion is relieved.
Further, by improving the durability of the retainer key, it is less likely to be damaged during installation, and as a result, the economic efficiency is improved.

In order to achieve the above object, the protective cap according to the present invention is characterized by a steel pipe pile/steel pipe configured to be connectable in the longitudinal direction by means of pin joints and box joints separately provided at the ends of steel pipes. 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 during the driving of the sheet pile, and can surround at least a portion of the pin joint provided with an outward concave portion. By being arranged in a key groove composed of 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, the protection a retaining key that connects the cap and the pin joint in a retaining state, the main body portion is provided with an opening that can be used when the retaining key is inserted into or removed from the key groove, and The left and right edge surfaces of the opening when viewed from the front face each other. and a locking portion that contacts the left and right edge surfaces when the portion is placed in the key groove, and the locking portion has a surface facing the left and right edge surfaces that is aligned with the left and right edges. The locking portion has a thickness in a direction along the axial direction of the body portion, and a base end on the inner side in a direction along the radial direction of the body portion. It is configured such that it becomes thinner from the portion to the outer tip portion in a direction along the radial direction of the main body portion .

According to the above-described configuration, the locking portion of the retainer key is configured such that the surfaces facing the left and right edge surfaces come into surface contact with the left and right edge surfaces. The bending moment generated by the distributed load received from the locking portion is reduced compared to the case where a concentrated load acts on the tip portion of the locking portion. Since the stress concentrated on the engaging portion is alleviated in this manner, the durability of the retainer key is improved. Further, by improving the durability of the retainer key, it is less likely to be damaged during installation, and as a result, the economic efficiency is improved.

Further , as described above, if the locking portion of the retaining key is configured so that the thickness decreases from the proximal end to the distal end, the locking portion does not come into contact with the upper and lower edge surfaces of the opening. . Therefore, 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. The durability of the retaining key is improved because the stress concentrated on the locking portion is relieved. Further, by improving the durability of the retainer key, it is less likely to be damaged during installation, and as a result, the economic efficiency is improved.

In the present invention, it is arranged between the removal prevention key arranged on the left edge surface side of the opening and the removal prevention key arranged on the right edge surface side of the opening, A fall-off prevention member is provided to prevent the pair of left and right removal-prevention keys from falling out of the opening, and the engaging portion includes a fall-off prevention mechanism to prevent the fall-off prevention member from falling out of the opening. The drop-off prevention mechanism is provided at an outer tip portion of the engaging portion in a direction along the radial direction of the main body portion, and the drop-off prevention member is provided along the radial direction of the main body portion. It preferably consists of a catch provided to contact an outer surface in the direction.

A drop-off prevention member is arranged between the pair of drop-off prevention keys arranged in both left and right directions from the opening to prevent the pair of drop-off prevention keys from falling off, but the drop-off prevention member falls off. Then, there is a possibility that the pair of retaining keys may fall off. According to the above-described configuration, the locking portion provided at the tip of the locking portion prevents the drop-off preventing 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 surface side of the opening and the key portion of the retaining key disposed on the right edge surface side of the opening. It is preferable that a connecting member for connecting the two is provided.

According to the above-described configuration, even if the boundary portion between the key portion of the retaining key and the locking portion is broken, the connecting member allows the key portion of the retaining key, which has lost the locking portion, to be positioned in the key groove in the circumferential direction of the steel pipe. prevented from moving to

In order to achieve the above object, the protective cap according to the present invention is characterized by a steel pipe pile/steel pipe configured to be connectable in the longitudinal direction by means of pin joints and box joints separately provided at the ends of steel pipes. 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 during the driving of the sheet pile, and can surround at least a portion of the pin joint provided with an outward concave portion. By being arranged in a key groove composed of 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, the protection a retaining key that connects the cap and the pin joint in a retaining state, the main body portion is provided with an opening that can be used when the retaining key is inserted into or removed from the key groove, and The retainer 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 a part of the communication hole is at least A collision member can be installed so as to be positioned in the inward concave portion, and the key portion abuts against the portion of the collision member, thereby moving the retaining key further into the key groove. The point is that it is configured to prevent

According to the above-described structure, when the blocking member is installed in the communicating hole, a portion of the blocking member is positioned within the key groove, so the key portion of the retaining key abuts against a portion of the blocking member to prevent it from coming off. The key is prevented from moving further into the keyway. Therefore, it is not always necessary to have a locking portion that is conventionally provided on the retainer key. The retaining key can be removed by removing the impact member from the communicating hole and pushing back the key portion of the retaining key by using a jig inserted through the communicating hole, for example.

Explanatory drawing of a protective cap and a pin joint according to an embodiment of the present invention FIG. 2 is a side cross-sectional view of the essential parts of the protective cap shown in FIG. 1; FIG. 2 is a cross-sectional plan view of the main part of the protective cap shown in FIG. 1; FIG. 10 is a plan cross-sectional view of a protective cap having a retaining key according to another embodiment of the present invention; FIG. 4 is a side cross-sectional view of a protective cap having a retaining key according to another embodiment of the present invention; FIG. 10 is a plan cross-sectional view of a protective cap having a retaining key according to another embodiment of the present invention; Explanatory drawing of fall prevention member Explanatory drawing of connecting member Explanatory drawing of a protective cap according to another embodiment of the present invention

An embodiment of a protective cap attachable to and detachable 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 portion of the steel pipe pile 1 .

The steel pipe pile 1 is configured so as to be connectable in the longitudinal direction by means of pin joints 3 provided separately at the ends of the steel pipes 2 and box joints (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 butt-welded steel pipe, a cast steel pipe, etc., and the pin joint 3 and the box joint are joined to the end of the steel pipe 2 by welding. .

An outer peripheral surface 31 of the pin joint 3 is provided with a single outward groove 32 along the circumferential direction at a position facing an inward groove provided in a box joint (not shown). This outward groove portion 32 is the outward concave portion 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 retained.

Further, a pin-side concave portion 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 concave portion provided on the box joint. By arranging the rotation prevention 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 driving such a steel pipe pile 1 by a vibration construction method that presses it into the ground while applying vibration with 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 by a crane. To avoid this, a protective cap 4 according to the invention is used.

The protective cap 4 has a cylindrical body portion 41 capable of enclosing the outer peripheral surface 31 of the pin joint 3 in which the outward groove portion 32 is provided. Therefore, the axial centers of the steel pipe 2, the pin joint 3, and the body portion 41 are aligned.

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

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

As shown in FIGS. 1 to 3, the protective cap 4 includes a locking key 5 that is arranged across the key groove composed of the inward groove portion 44 and the outward groove portion 32 to prevent the pin joint 3 from coming off. .

The retainer key 5 is provided with an arcuate key portion 51 and a locking portion 52 integrally formed at one end of the key portion 51 .

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 engaging portion 52 is positioned on the left edge surface 45L or the right edge surface 45R of the opening portion 45. Contact.

At this time, the retainer key 5 according to the present embodiment extends in the radial direction of the body portion 41 from the inner base end portion 52B in a direction along the length of the locking portion 52, that is, in the radial direction of the body portion 41. The length to the outer tip portion 52T in the direction along which the key portion 51 extends is configured to be about 40% of the thickness of the key portion 51 in the direction along the axis of the main body portion 41 . The tip portion of the engaging portion 52 contacts only the inner portion of the left and right edge surfaces 45L and 45R in the radial direction of the main body portion 41 .

Since the length of the engaging portion 52 is short, the bending moment generated by the force that the boundary portion between the key portion 51 and the engaging portion 52 receives from the left and right edge surfaces 45L and 45R and the upper and lower edge surfaces 45T and 45B is Compared to the case where the upper and lower edge surfaces 45T and 45B come into contact with the outer portion in the radial direction of the body portion 41, the contact force is reduced. Since the stress concentrated on the locking portion 52 is alleviated in this manner, the durability of the retainer key 5 is improved. Further, by improving the durability performance of the retainer key 5, it is less likely to be damaged during construction, and as a result, the economic efficiency is improved.

The pin joint 3 and the protective cap 4 are prevented from coming off by arranging the retainer key 5 configured in this way so as to straddle the key groove composed of the outward groove portion 32 and the inward groove portion 44 . Become.

By the way, as in the conventional art, the engaging portion 52 of the retaining key 5 has a length that extends to the vicinity of the outer surface of the opening 45 in the radial direction of the body portion 41 . Then, when removing the retainer key 5 from the key groove, the locking portion can be gripped, etc., so workability is good. However, if the locking portion 52 of the retaining key 5 is short, it is positioned deep in the opening 45, making it difficult to grasp and remove the retaining key 5. This poses a problem.

Therefore, the locking portion 52 is provided with a through hole 53 along the circumferential direction of the body portion 41 . If the retaining key 5 is placed in the key groove while the blunt iron wire 54 and the binding band are inserted in advance through the through hole 53 provided in the locking portion 52, the blunt iron wire is removed when the retaining key 5 is removed. 54 or a binding band can be grasped, the retaining key 5 can be easily taken out. However, the through hole 53 does not need to be provided in the engaging portion 52 in a direction along the circumferential direction of the body portion 41, and may be provided in a direction intersecting the circumferential direction of the body portion 41. . Also, the through hole 53 is not an essential component of the retainer key 5 .

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

Another embodiment of the protective cap will be described below. In the following description, the same reference numerals are given to the same configurations as those in the above-described embodiment, and the description thereof will be omitted.

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 engaging portion 62 is configured to have a length such that it contacts outer portions of the left and right edge surfaces 45L and 45R in a direction along the radial direction of the body portion 41. The thickness in the radial direction extends from the inner base end portion 62B in the radial direction of the main body portion 41 to the outer distal end portion in the radial direction of the main body portion 41. It is configured to become thinner as it reaches 62T.

If the engaging portion 62 of the retention key 6 is configured to be thinner from the base end portion 62B to the distal end portion 62T, the engaging portion 62 will not be able to move against the upper and lower edge surfaces 45T and 45B of the opening 45. no contact. Therefore, at least the boundary between the key portion 61 and the locking portion 62 does not receive a load from the upper and lower edge surfaces 45T and 45B of the opening 45 during driving. Since the stress concentrated on the locking portion 62 is alleviated, the durability of the retaining key 6 is improved. Further, by improving the durability performance of the retainer key 6, it is less likely to be damaged during construction, and as a result, the economic efficiency is improved.

In the embodiment shown in FIG. 6, the retainer 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 such that it contacts outer portions of the left and right edge surfaces 45L and 45R in a direction along the radial direction of the main body portion 41. is configured such that the facing surfaces 73 facing the left and right edge surfaces 45L and 45R are in surface contact with the left and right edge surfaces 45L and 45R.

As a result, when the opposing surface 73 receives a distributed load from the left and right edge surfaces 45L and 45R during driving, the bending moment generated in the engaging portion 72 is will be reduced in comparison. Since the stress concentrated on the locking portion 72 is alleviated in this manner, the durability of the retainer key 7 is improved. Further, by improving the durability performance of the retainer key 7, it is less likely to be damaged during construction, and as a result, the economic efficiency 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 , which extends from the inner base end portion 72B in a direction along the radial direction of the main body portion 41 . , in a direction along the radial direction of the body portion 41, the thickness may be reduced toward the outer tip portion 72T.

If the locking portion 72 of the retention key 7 is configured so that the thickness becomes thinner from the base end portion 77B to the tip portion 77T, the locking portion 72 will not be attached to the upper and lower edge surfaces 45T and 45B of the opening 45. no contact. Therefore, the boundary portion between the key portion 71 and the locking portion 72 does not receive the 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 alleviated, the durability of the retaining key 7 is improved. Further, by improving the durability performance of the retainer key 7, it is less likely to be damaged during construction, and as a result, the economic efficiency is improved.

In any of the above-described embodiments, the protective cap 4 may be provided with the drop-off prevention member 10. As shown in FIG. As shown in FIG. 7, the drop-off prevention member 10 includes a retention key 8L arranged on the left edge surface 45L side of the opening 45 and a retention key 8L arranged on the right edge surface 45R side of the opening 45. 8R to prevent the left and right retaining keys 8L and 8R from coming off from the opening 45. As shown in FIG. The drop-off prevention member 10 can absorb an impact load, such as a low-resilience soft foam such as sponge rubber, or a low-resilience soft material such as rubber, plastic, or wood, and can retain its shape when the load is removed. It is preferable that it is composed of an elastic body that can return to its original state. Although the retaining keys 8L and 8R are called separately for convenience of explanation, they have the same structure. Therefore, the same explanation holds even if the two are interchanged.

At that time, the locking portions 82</b>L and 82</b>R may be provided with a fall prevention mechanism that prevents the fall prevention member 10 from falling out of the opening 45 . The drop-off prevention mechanism is a hooking portion provided at the tip of each of the locking portions 82L and 82R so as to come into contact with the outer surface of the drop-off preventing member 10 in a direction along the radial direction of the main body portion 41. It is composed of 83L and 83R. The locking portions 83L and 83R provided at the distal end portions of the locking portions 82L and 82R prevent the drop-off preventing member 10 from falling off, thereby preventing the pair of locking keys 8L and 8R from falling off.

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 key portion 91L on the right edge surface 45R side of the opening portion 45. A connecting member 11 that connects 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 or a dulled iron wire can be suitably exemplified. Although the retaining keys 9L and 9R are called separately for convenience of explanation, they have the same structure. Therefore, the same explanation holds even if the two are interchanged.

Even if the boundary portions between the key portions 91L, 91R of the retaining keys 9L, 9R and the locking portions 92L, 92R are broken, the connecting member allows the key portions 91L, 91R of the retaining keys that have lost their locking portions to remain in the key grooves. , movement of the steel pipe 2 in the circumferential direction is prevented.

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

By winding a sling belt around the body portion 41 so as to cover the opening 45, the retaining keys 5 to 9 may be prevented from slipping out of the key groove through the opening 45.

The connection of the protective cap 4 to the steel pipe pile 1 can be easily released by taking out the retaining key 5 through the opening 45 , thereby removing the protective cap 4 from the steel pipe pile 1 .

Yet another embodiment of the protective cap will be described. In the following description, the same reference numerals are given to the same configurations as those in the above-described embodiment, and the description thereof will be omitted.

As shown in FIG. 9, in this embodiment, the retaining key 12 of the protective cap 4 is composed only of an arcuate key portion.

A body portion 41 of the protective cap 4 is provided with a communication hole 13 that communicates with the inward groove portion 44 .

A blocking member 14 can be installed in the communicating hole 13 . The blocking member 14 is a bolt-shaped member in this embodiment, and the blocking member 14 and the communication hole 13 are formed with screws that are screwed together. However, the impact member 14 and the communication hole 13 may not be threaded. In this case, the blocking member 14 is attached to the communicating hole 13 by adhesion or welding.

The impact member 14 is configured such that a portion of the impact member 14 is positioned 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 portion of the blocking member 14, and the retaining key 12 is prevented from moving further into the key groove. The communication hole 13 is located at an appropriate position according to the length of the retaining key 12 in the direction along the circumferential direction of the main body 41. A part of the retaining key 12 is provided at a position where it can be seen from the opening 45 even when it is in contact with it.

The retaining key 12 can be removed by removing the blocking member 14 from the communicating hole 13 and pushing back the key portion of the retaining key 12 by a jig inserted through the communicating hole 13, for example. However, also in this embodiment, the retainer key 12 may be provided with a locking portion as in the embodiment described above.

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

In each embodiment mentioned above, although the steel pipe pile 1 which is the object of attachment or detachment of the protection cap 4 which concerns on this invention demonstrated the case where it was driving construction by the vibration construction method, it does not restrict 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 digging method, and a pre-boring method.

Each of the above-described embodiments is an example of the present invention, and the present invention is not limited by the description, and the specific configuration of each part can be appropriately changed and designed within the scope of the effects of the present invention. 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 prevention member 11 : Connecting member 12 : Retaining key 13 : Through hole 14 : Blocking 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: proximal end portion 62T: distal end portion 71: key portion 72: locking portion 72B: proximal end portion 72T: distal end portion 73: facing surface 77B: proximal end portion 77T: distal end portion 82L: locking portion 82R: locking portion 83L: locking portion 83R: locking portion 91L: key portion 91R: key portion 92L: locking portion 92R: locking portion

Claims (5)

Pin joints provided in steel pipe piles and steel pipe sheet piles that are driven in during driving of steel pipe piles and steel pipe sheet piles that are configured to be connectable in the longitudinal direction by pin joints and box joints that are distributed at the ends of steel pipes. A protective cap that is removable from the
a body portion capable of enclosing at least a portion of the pin joint provided with an outward concave portion;
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. and a retaining key that connects the joint in a retaining state,
The main body is provided with an opening that can be used when the retaining key is inserted into or removed from the keyway,
The retainer key is formed integrally with a key portion arranged in the key groove and one end of the key portion, and when the key portion is arranged in the key groove, the left and right sides of the opening in a front view are aligned. and a locking portion that contacts the edge surface of the
The protective cap is configured such that the engaging portion has a length such that it contacts only an inner portion of the left and right edge surfaces in a direction along the radial direction of the main body portion. Pin joints provided in steel pipe piles and steel pipe sheet piles that are driven in during driving of steel pipe piles and steel pipe sheet piles that are configured to be connectable in the longitudinal direction by pin joints and box joints that are distributed at the ends of steel pipes. A protective cap that is removable from the
a body portion capable of enclosing at least a portion of the pin joint provided with an outward concave portion;
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. and a retaining key that connects the joint in a retaining state,
The main body is provided with an opening that can be used when the retaining key is inserted into or removed from the keyway,
The retainer key is formed integrally with a key portion arranged in the key groove and one end of the key portion, and when the key portion is arranged in the key groove, the left and right sides of the opening in a front view are aligned. and a locking portion that contacts the edge surface of the
The engaging portion is configured to have a length such that it contacts outer portions of the left and right edge surfaces in a direction along the radial direction of the main body portion, and is configured to contact the axial center of the main body portion. The thickness in the direction along the direction extends from the inner proximal end in the radial direction of the main body to the outer distal end in the radial direction of the main body. A protective cap that is configured to taper with age. Pin joints provided in steel pipe piles and steel pipe sheet piles that are driven in during driving of steel pipe piles and steel pipe sheet piles that are configured to be connectable in the longitudinal direction by pin joints and box joints that are distributed at the ends of steel pipes. A protective cap that is removable from the
a body portion capable of enclosing at least a portion of the pin joint provided with an outward concave portion;
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. and a retaining key that connects the joint in a retaining state,
The main body is provided with an opening that can be used when the retaining key is inserted into or removed from the keyway,
Left and right edge surfaces of the opening when viewed from the front face each other,
The retaining key is formed integrally with a key portion arranged in the key groove and one end of the key portion, and contacts the left and right edge surfaces when the key portion is arranged in the key groove. a locking portion is provided,
The engaging portion is configured such that surfaces facing the left and right edge surfaces are 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, which extends radially from an inner base end portion in a direction along the radial direction of the main body. A protective cap configured to taper to its outer tip in a direction along which it extends . disposed between the retaining key disposed on the left edge surface side of the opening and the retaining key disposed on the right edge surface side of the opening;
a drop-off preventing member for preventing the pair of left and right drop-off preventing keys from dropping out of the opening;
The locking portion is provided with a fall-off prevention mechanism for preventing the fall-off prevention member from falling out of the opening,
The drop-off prevention mechanism is provided at an outer tip portion of the locking portion in a direction along the radial direction of the body portion, and the drop-off prevention member is provided in a direction along the radial direction of the body portion. 4. The protective cap according to any one of claims 1 to 3 , comprising a hook provided so as to contact the outer surface. A connecting member that connects the key portion of the retaining key disposed on the left edge surface side of the opening and the key portion of the retaining key disposed on the right edge surface side of the opening. 5. A protective cap according to any one of claims 1 to 4 , provided with a .

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