JP5623665B1 - Cap for driving steel pipe pile driving device and driving method using the same - Google Patents

Abstract

An object of the present invention is to provide a driving cap for a steel pipe pile driving device capable of reliably preventing deformation of the steel pipe pile both in and out of the radial direction by hammering, and quickly attaching a joint joint without repairing the upper end of the steel pipe pile. A driving method using this is provided. SOLUTION: When the steel pipe pile W is driven into the soil, there is an outer space in which there is a gap with respect to the inner diameter of the steel pipe pile W that suppresses the deformation in the radial direction of the steel pipe pile W below the elastic limit point by hammering. The inner restraint 2 formed in the diameter is inserted from above to restrain the upper end of the steel pipe pile W radially inward so as not to be plastically deformable. On the other hand, the steel pipe pile W is deformed radially outward by hammering. End-bounded outer restraint 3 formed with an inner diameter such that a gap that keeps below an elastic limit point with respect to the outer diameter of steel pipe pile W is formed in the radial direction from one end and the other end in the circumferential direction. The fastening seats protruding outward are fastened so as to approach each other, and the upper end portion of the steel pipe pile W is restrained in a radially outward direction so as not to be plastically deformable. [Selection] Figure 2

Description

  The present invention relates to a driving cap for a steel pipe pile driving device that is attached to the upper end portion of the steel pipe pile when the steel pipe pile is driven into the soil by vibration or hammering from a hammer of the steel pipe pile driving device, and a driving method using the same. .

  In general, steel pipe piles are driven into the ground by repeated vibration of the hammer mounted on the steel pipe pile driving device and the fall energy of the hammer. At this time, the axial center of the hammer is not applied to the steel pipe pile so that an eccentric load is not applied. And the axis of the steel pipe pile must be matched.

  Therefore, the upper end portion of the steel pipe pile is covered with a driving cap for making the axis of the hammer and the axis of the steel pipe pile coincide as much as possible, and vibration and hammering from the hammer are applied to the steel pipe through this driving cap. It acts on the pile. A cylindrical inner restraint protrudes from the lower surface of the driving cap. The outer peripheral surface of the inner restraint is aligned with the inner peripheral surface of the steel pipe pile, and the upper end of the steel pipe pile is radially inward. By restraining them so that they cannot be deformed, the axis of the hammer and the axis of the steel pipe pile are made to coincide.

  In addition, as an inward restraint for the driving cap, a single rod type cylinder fixed to the head side, a plurality of upper links having one end connected by a pin around the cylinder fixing portion on the lower surface of the cap, Some include a plurality of lower links that connect the other end of the link and the rod end of the cylinder to form a plurality of sets of pantograph shapes with each upper link, and a fluid pressure device that operates the cylinder (Patent Document) 1). This inward restraint tool moves the rod end in the vertical direction as the cylinder operates, and this movement matches the inner end surface of the steel pipe pile with the connecting part of the upper and lower links formed in a pantograph shape with the rod end. By letting the upper end of the steel pipe pile be restrained so as not to be deformed radially inward, the axis of the hammer and the axis of the steel pipe pile are matched.

Japanese Utility Model Publication No. 6-3873

By the way, in both the former and the latter, the inner restraint is matched with the inner peripheral surface of the steel pipe pile and the upper end portion of the steel pipe pile is restrained so as not to be deformed radially inward. The upper end is opened in a state that can be deformed radially outward. Therefore, even if the axis of the hammer is aligned with the axis of the steel pipe pile, the upper end of the steel pipe pile may be deformed outward in the radial direction due to repetition of the falling energy of the hammer. In this case, it is not possible to attach a pile head joint or the like to the upper end of the steel pipe pile that has been driven in. I can't.
In that case, the upper end of the steel pipe pile must be repaired so that various joints such as pile head joints and joints can be mounted, and it takes time to repair them, and various joints cannot be quickly mounted. .

  The present invention has been made in view of such points, and the object of the present invention is to reliably prevent deformation of the steel pipe pile in both the radial direction and the internal direction due to repetition of the falling energy of the hammer, and the upper end of the steel pipe pile. An object of the present invention is to provide a driving cap for a steel pipe pile driving device that can quickly mount various joints without the need for repairing and a driving method using the same.

  In order to achieve the above object, the solution provided by the present invention includes a driving cap that is placed on the upper end of the steel pipe pile when the steel pipe pile is driven into the soil by vibration or hammering from the hammer of the steel pipe pile driving device. Assumption. Further, an inner restraint that is inserted from above into the inner peripheral surface of the steel pipe pile and restrains the upper end portion of the steel pipe pile in a radially inward manner so as not to be plastically deformable, and an upper end portion of the inner restraint tool. A lower end surface is in contact with the upper end surface of the steel pipe pile to cause vibration and hammering from the hammer, and an end ring is formed extending in the circumferential direction along the outer peripheral surface of the steel pipe pile. The upper ends of the steel pipe piles are restrained so as not to be plastically deformable radially outward by fastening the fastening seats projecting radially outward from the one end and the other end in the circumferential direction so as to approach each other. A direction restraint. And the outer diameter of the inner restraint is such that there is a gap with respect to the inner diameter of the steel pipe pile that suppresses the deformation in the radial direction of the steel pipe pile due to vibration and hammering from the hammer to less than the elastic limit point. On the other hand, the outer restraint tool has a gap with respect to the outer diameter of the steel pipe pile that suppresses deformation of the steel pipe pile in the radially outward direction due to vibration and hammering from the hammer to less than an elastic limit point. It is characterized by being formed in such an inner diameter.

  Moreover, it is preferable that the outward restraint is provided integrally with the action portion.

  Further, the outer restraint tool is divided into a plurality of divided pieces in the circumferential direction, and the ends of the divided pieces adjacent to each other in the circumferential direction are supported so as to be rotatable around a hinge axis extending in the vertical direction. Is preferred.

  On the other hand, the outer restraint tool is divided into a plurality of divided pieces in the circumferential direction, and the divided pieces adjacent to each other in the circumferential direction are radially outward from the one side end and the other side end, respectively. The projecting fastening seats may be fastened so as to approach each other.

  Further, in order to achieve the above object, the solution provided by the present invention is the driving means for covering the upper end of the steel pipe pile when the steel pipe pile is driven into the soil by vibration or hammering from the hammer of the steel pipe pile driving device. The driving method using a cap is assumed. And the inner restraint which formed the space | gap which suppresses the deformation | transformation to the inner radial direction of the said steel pipe pile below the elastic limit point by the vibration and hammering from the said hammer in the outer diameter which exists with respect to the internal diameter of the said steel pipe pile Is inserted from above and the upper end of the steel pipe pile is restrained in a radially inward direction so as not to be plastically deformable, and the lower end of the action portion provided at the upper end of the inner restraint is in contact with the upper end surface of the steel pipe pile. Let me. After that, an end ring-shaped ring formed with an inner diameter such that a gap that suppresses deformation of the steel pipe pile outward in the radial direction due to vibration and hammering from the hammer to less than an elastic limit point exists with respect to the outer diameter of the steel pipe pile. The outer restraint is fastened so that the fastening seats protruding radially outward from the one end and the other end in the circumferential direction are brought close to each other, and the upper end portion of the steel pipe pile is plastically outward in the radial direction. It is characterized by being restrained so that it cannot be deformed.

In summary, in the steel pipe pile driving device and the driving method using the same, when the steel pipe pile is driven into the soil by vibration or hammering from the hammer of the steel pipe pile driving device, vibration or hammering from the hammer is required. Insert the inner restraint formed on the outer diameter so that the gap in the radial direction of the steel pipe pile is less than the elastic limit point to the inner diameter of the steel pipe pile, and insert the upper end of the steel pipe pile from above. After restraining plastic deformation inward in the radial direction and making the working part provided at the upper end of the inner restraint abut the upper end surface of the steel pipe pile, the radial direction of the steel pipe pile due to vibration or hammering from the hammer An endless annular outer restraint formed with an inner diameter that has a void that suppresses outward deformation below the elastic limit point with respect to the outer diameter of the steel pipe pile, from one end in the circumferential direction and the other end. Tightening seats that protrude radially outward Concluded so as to approach the have plastic deformation incapable to restrain the upper portion of the steel pipe pile radially outward.
As a result, the upper end of the steel pipe pile is constrained from both inside and outside in a state where the axis of the hammer of the steel pipe pile driving device is aligned with the axis of the steel pipe pile, and the fall energy of the hammer of the steel pipe pile driving device is repeated. The steel pipe pile is reliably prevented from being deformed both inside and outside in the radial direction. Therefore, it becomes unnecessary to repair the upper end of the steel pipe pile, and various joints can be quickly mounted.

  Also, by providing the outer restraint integrally with the action part, the inner restraint and the outer restraint are integrated, and the outer restraint can be easily attached to the upper end of the steel pipe pile with the inner restraint attached. Can be attached to.

  Furthermore, the outer restraint tool is divided into a plurality of divided pieces in the circumferential direction, and the ends of the adjacent divided pieces are supported so as to be pivotable around a hinge axis extending in the vertical direction, thereby The outer restraint can be easily attached to the upper end by simply tightening the fastening seats at one end and the other end in the circumferential direction, and not only the outer restraint can be attached but also removed easily and quickly. be able to.

  On the other hand, because there is no connection relationship between the ends of each divided piece by fastening the fastening seats of the ends of each adjacent divided piece divided in the circumferential direction of the outer restraint, The outer restraint can be easily attached to and detached from the upper end portion of the steel pipe pile, and the outer restraint can be easily attached and detached even in a place where there is not enough space.

It is explanatory drawing which shows the operation state in the driving | induction site of the steel pipe pile using the driving cap of the steel pipe pile driving apparatus which concerns on embodiment of this invention. It is sectional drawing of the upper end part of the steel pipe pile in the state which removed one division piece in the outward restraint tool of the driving cap of FIG. It is the top view seen from the state in the state where the outward restraint tool of Drawing 2 was installed in the upper end part of a steel pipe pile. It is a front view of the outward restraint tool of FIG. It is explanatory drawing of the joint which joins up-and-down steel pipe piles. It is the top view seen from the top in the state where the outward restraint tool concerning the modification of an embodiment was equipped in the upper end part of a steel pipe pile. It is sectional drawing of the upper end part of the steel pipe pile in the state which removed one division piece in the outward restraint tool of the driving cap which concerns on the other modification of embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention. In addition, the following embodiment is an example which actualized this invention, Comprising: The thing of the character which limits the technical scope of this invention is not.

  FIG. 1: has shown explanatory drawing which shows the working condition in the driving field of the steel pipe pile using the driving cap of the steel pipe pile driving apparatus which concerns on the 1st Embodiment of this invention. This driving site is a narrow space that is blocked by buildings.

  In FIG. 1, W is a steel pipe pile in which a driving cap 1 of the steel pipe pile driving apparatus K according to the first embodiment of the present invention is put on the upper end portion, and a plurality of the steel pipe piles W are prepared. The steel pipe piles W are successively driven into the soil by striking from the hammer K1 of the steel pipe pile driving device K while adding the steel pipe piles W. In this case, as the steel pipe pile driving device K, since the driving site is a narrow space, an in-vehicle type large steel pipe pile driving device cannot be entered, so that a portable hand type device is used. Further, the steel pipe pile W is added until the tip reaches a solid support ground formed by consolidation of gravelly soil or the like below the surface layer of the ground G.

  As each steel pipe pile W, the thing of the length 1500mm-1800mm formed in the cross-section annular | circular shape, and the internal diameter was set to 105.7 mm and the outer diameter was respectively set to 114.3 mm is used. Each steel pipe pile W is not limited to this, and may have other various sizes.

  The steel pipe pile driving device K includes a pair of left and right operation handles K3 and K3 projecting from the upper end of the device main body K2, and a working air intake port (not shown) provided on one of the operation handles K3. And an operation switch lever (not shown) provided on the other operation handle K3. The hammer K1 protrudes downward from the lower end of the apparatus main body K2. Then, a reciprocating motion of a piston (not shown) driven by working air in the apparatus main body K2 gives a blow from the upper end portion of the uppermost reinforcing pile W through the hammering cap 1 from the hammer K1. A shock wave is transmitted to the tip of the lowermost reinforcing pile W by the hit. Since the steel pipe pile driving device K is known per se, the details of the internal structure are omitted.

  FIG. 2 is a cross-sectional view of the upper end of the steel pipe pile with one split piece removed from the outer restraint of the driving cap 1, and FIG. 3 shows the outer restraint attached to the upper end of the steel pipe pile. FIG. 4 is a plan view seen from above, and FIG. 4 shows a front view of the outward restraint.

  The driving cap 1 is a cylindrical inner restraint that is inserted from above into the inner peripheral surface of the steel pipe pile W located on the ground and restrains the upper end portion of the steel pipe pile W radially inward so as not to be plastically deformable. 2 and a fastening seat 35 that extends in the circumferential direction along the outer peripheral surface of the steel pipe pile W located on the ground and is formed into a ring-like end, and projects radially outward from one end and the other end in the circumferential direction. , 35 are fastened so as to be close to each other, and an outer restraint 3 for restraining the upper end portion of the steel pipe pile W radially outward so as not to be plastically deformable. And the inward restraint tool 2 has a gap (for example, about 0.1 mm to 0.2 mm) that suppresses deformation in the radial direction of the steel pipe pile W by hammering from the hammer K1 to less than the elastic limit point. The outer diameter (for example, about 105.3 mm) is formed with respect to the inner diameter. On the other hand, the outer restraint tool 3 has a gap (for example, about 0.1 mm to 0.2 mm) that suppresses the deformation of the steel pipe pile W in the radial direction due to the hammering from the hammer K1 below the elastic limit point. It is formed to have an inner diameter (for example, about 114.5 mm) that exists with respect to the outer diameter. The inner restraint 2 and the outer restraint 3 are configured separately from each other, and both are formed of carbon steel (S55C).

  In addition, a striking action portion 21 as an action portion that is in contact with the top end surface of the steel pipe pile W and acts on striking from the hammer K1 is integrally provided at the upper end of the inner restraint 2. The striking action portion 21 has a cylindrical shape formed with an outer diameter (114.5 mm) that is substantially the same as the inner diameter of the outer restraint tool 3, and the step surface 22 (lower end face) with the inner restraint tool 2 is a steel pipe pile. It is in contact with the upper end surface of W. In addition, a columnar flange 23 is integrally connected to the upper end of the hitting action portion 21. Further, a recess 24 into which the hammer K <b> 1 is inserted is provided on the upper end surface of the flange portion 23, and the recess 24 is positioned near the lower portion of the hitting action portion 21 through the center of the flange portion 23.

  On the other hand, the outward restraint tool 3 includes two divided pieces 31 and 32 divided in the circumferential direction. The one end portions 311 and 321 of the divided pieces 31 and 32 adjacent to each other of the divided pieces 31 and 32 are one side end and the other side end of the outer restraint tool 3, respectively. Fastening seats 35 and 35 are provided at one end portions 311 and 321 of 32. The fastening seats 35, 35 are fastened by a fastener 33. On the other hand, the other end portions 312 and 322 of the adjacent divided pieces 31 and 32 are supported so as to be rotatable around a hinge shaft 34 extending in the vertical direction.

  Fasteners 33 are provided at three locations in the vertical direction of the fastening seats 35, 35. The fasteners 33 are bolts 331 inserted into bolt insertion holes 351 that open to the respective fastening seats 35, and nuts 332 that are screwed onto the distal ends of the bolts 331 via the bolt insertion holes 351 of both fastening seats 35. It has. The inner peripheral surface of the outer restraint 3 is formed to have a slightly shorter peripheral length than the outer peripheral surface of the steel pipe pile W, and the nut 332 is fastened to the bolt 331 so that the upper end portion of the steel pipe pile W is radiused. There is a slight amount of gap (for example, about 4 mm) between the fastening seats 35 when restrained in the direction outward so as not to be deformed.

FIG. 5 shows an explanatory diagram of a joint joint that joins the upper and lower steel pipe piles W, W together.
In FIG. 5, the joint joint 4 is formed in an annular shape. The joint 4 is integrally formed with a flange 41 formed in the middle of the axial direction (vertical direction in FIG. 5) with the same diameter as the outer peripheral surface of the steel pipe pile W, and upper and lower ends of the flange 41. Protruding and provided with annular connecting portions 42 and 42 having the same diameter as the inner peripheral surface of the steel pipe pile W. On the projecting end side of each annular connecting portion 42, pins 43 projecting from four places at equal intervals in the circumferential direction are provided. Each pin 43 protrudes outward in the radial direction by the thickness of the steel pipe pile W. Moreover, the locking groove | channel W1 which each latches the pin 43 of the joint joint 4 is provided in the axial direction both ends of each steel pipe pile W at four places of the circumferential direction equal intervals. Each of the locking grooves W1 is formed in a substantially L shape when viewed from the front, one end is open at both ends in the axial direction of the steel pipe pile W, and the axial end of the steel pipe pile W that is the one end side and the flange of the joint joint 4 The pin 43 is guided in the vertical direction until it comes into contact with the portion 41 and then guided to one side in the horizontal direction to prevent the pin 43 from falling off.

  Here, a description will be given of the procedure of a driving method for sequentially driving a plurality of steel pipe piles W into the soil while adding a plurality of steel pipe piles W by hammering the steel pipe pile driving apparatus K.

  First, the driving cap 1 is put on the upper end portion of the steel pipe pile W on the ground where the hammer K1 of the steel pipe pile driving apparatus K is hit. In other words, the inner restraint formed with an outer diameter such that a gap that suppresses the deformation in the radial direction of the steel pipe pile W due to vibration or hammering from the hammer K1 to less than the elastic limit point exists with respect to the inner diameter of the steel pipe pile W. 2 is inserted from above, and the upper end portion of the steel pipe pile W is restrained in a radially inward direction so as not to be plastically deformable. At this time, the step surface 22 of the hitting action portion 21 provided on the upper end portion of the inner restraint tool 2 with the inner restraint tool 2 is brought into contact with the upper end surface of the steel pipe pile W.

  Next, the outer restraint 3 is attached to the upper end portion of the outer peripheral surface of the steel pipe pile W. In other words, the outer end of the annular end formed with an inner diameter such that a gap that suppresses the deformation of the steel pipe pile W outward in the radial direction by hammering from the hammer K1 to less than the elastic limit point exists with respect to the outer diameter of the steel pipe pile W. The restraint 3 is fastened by the respective fasteners 33 so that the fastening seats 35, 35 projecting radially outward from the one end and the other end in the circumferential direction are brought close to each other, and the upper end of the steel pipe pile W The part is constrained so as not to be plastically deformed radially outward.

  Then, the tip of the hammer K1 of the steel pipe pile driving device K is inserted into the concave portion 24 of the flange portion 23 of the hammering action portion 21, and the hammer K1 is hit against the upper end portion of the steel pipe pile W via the driving cap 1. A steel pipe pile W is driven into the soil.

  Thereafter, when the steel pipe pile W is driven into the soil leaving the upper end portion, the hammer K1 is taken out from the concave portion 24 of the flange portion 23 of the hitting action portion 21. Then, the driving cap is removed from the upper end of the steel pipe pile W. That is, the split pieces 31, 32 are released from fastening by the fastening members 33 between the fastening seats 35, 35, are rotated around the hinge shaft 34, and the outer restraint tool 3 is removed. After the removal of the outer restraint 3 is completed, the inner restraint 2 is removed from the upper end portion of the inner peripheral surface of the steel pipe pile W.

  Thereafter, the joint joint 4 is attached to the steel pipe pile W driven into the soil leaving the upper end. That is, in the state where each pin 43 is made to coincide with each locking groove W1 whose one end opens at the upper end of the steel pipe pile W, the one annular connecting portion 42 is inserted into the inner peripheral surface of the steel pipe pile W, When the upper end comes into contact with the flange portion 41 of the joint joint 4, the joint joint 4 is rotated to one side to guide the pin 43 in each locking groove W1 to one side in the horizontal direction.

  Then, the next steel pipe pile W is joined through the joint joint 4. That is, with respect to the other annular connecting portion 42 of the joint joint 4 in which one annular connecting portion 42 is inserted into the upper end portion of the inner peripheral surface of the steel pipe pile W driven into the soil leaving the upper end portion, the next steel pipe pile W In the state where each pin 43 is aligned with each locking groove W1 whose one end opens at the lower end of the steel pipe, the lower end portion of the inner peripheral surface of the next steel pipe pile W is inserted, and the lower end of the steel pipe pile W is connected to the joint joint 4. At the point of contact with the flange 41, the joint joint 4 is rotated to one side to guide the pin 43 in each locking groove W1 to one side in the horizontal direction. At this time, since the upper and lower steel pipe piles W, W connected through the joint joint 4 are aligned with each other on one side in the horizontal direction, the direction of guiding the pin 43 in each locking groove W1 is the next steel pipe pile. When W (upper steel pipe pile W) is rotated, locking by the joint joint 4 with the previous steel pipe pile W (lower steel pipe pile W) is not released.

  Then, the upper end portion of the steel pipe pile W on the ground jointed by the joint joint 4 is covered with the driving cap 1, and the upper end portion of the steel pipe pile W is hit by the hammer K 1 through the driving cap 1, thereby providing strong support. Repeatedly driving the steel pipe pile W into the soil while adding the steel pipe pile W until the tip of the steel pipe pile W reaches the ground.

  Thus, in the present embodiment, when the steel pipe pile W is driven into the soil by hitting the steel pipe pile driving device K from the hammer K1, the deformation of the steel pipe pile W inward in the radial direction by the hit from the hammer K1. The upper end of the steel pipe pile W cannot be plastically deformed radially inward by inserting the inner restraint 2 formed with an outer diameter that keeps the gap below the elastic limit point with respect to the inner diameter of the steel pipe pile from above. The stepped surface 22 of the hitting action portion 21 provided at the upper end of the inner restraint is brought into contact with the upper end surface of the steel pipe pile W, and then the outer side of the steel pipe pile W in the radial direction by hitting from the hammer K1. An endless annular outer restraint 3 formed with an inner diameter such that a gap that suppresses deformation to less than the elastic limit point exists with respect to the outer diameter of the steel pipe pile W is provided at one end in the circumferential direction and at the other end. Fastening seats 35 and 35 are fastened by the respective fasteners 33 so as to be close to each other. Te, it is plastically undeformable restrained an upper end of the steel pipe pile W radially outward. Thereby, the upper end part of the steel pipe pile W is restrained from both inside and outside in the radial direction in a state in which the axis of the hammer K1 of the steel pipe pile driving device K and the axis of the steel pipe pile W are matched, and the hammer of the steel pipe pile driving device K is The deformation of the steel pipe pile W in both the radial direction and the external direction due to the repetition of the drop energy of K1 is reliably prevented. Therefore, it becomes unnecessary to repair the upper end portion of the steel pipe pile W, and the joint joint 4 can be quickly mounted.

  Further, the outer restraint tool 3 is divided into two split pieces 31 and 32 in the circumferential direction, and fastening seats 35 and 35 of one end portions 311 and 321 of the split pieces 31 and 32 are fastened by a fastener 33. At the same time, since the other end portions 312 and 322 of the split pieces 31 and 32 are supported so as to be rotatable around the hinge shaft 34 extending in the vertical direction, the outer restraint 3 is attached to the upper end portion of the steel pipe pile W. The fastening pieces 35 and 35 can be simply tightened at the one end portions 311 and 321 of the divided pieces 31 and 32 only by the fastening tool 33, and not only the outer restraint tool 3 but also the detachment can be easily and quickly performed. .

In addition, this invention is not limited to the said embodiment, The other various modifications are included. For example, in the present embodiment, the outer restraint tool 3 is divided into two divided pieces 31 and 32 in the circumferential direction. However, as shown in FIG. 6, the outer restraint tool 5 is divided into four divided pieces 51 in the circumferential direction. It may be divided into ~ 54. In this case, one end portions 521 and 531 of the respective divided pieces 52 and 53 adjacent to each other in the circumferential direction, the other end portions 512 and 522 of the respective divided pieces 51 and 52, and the other end portion 532 of each of the divided pieces 53 and 54. , 542 are supported so as to be rotatable around a hinge shaft 34 extending in the vertical direction.
Also, the outer restraint device is divided into a plurality of divided pieces in the circumferential direction, and the divided pieces adjacent to each other in the circumferential direction are protruded radially outward from one end and the other end in the circumferential direction. The seats may be fastened so as to approach each other. In this case, since there is no connection relationship between the divided pieces, the outer restraint can be easily attached to and detached from the upper end of the steel pipe pile, and the outer restraint can be performed even in a place where there is not enough space. Equipment can be easily attached and detached.

Further, in the present embodiment, the inner restraint 2 and the outer restraint 3 are configured separately. However, as shown in FIG. 7, the upper end of the hinge shaft 61 is attached to the flange 23 of the hitting action portion 21. The holding part 62 to hold | maintain is provided, and the outer side support part 3 may be integrally provided in the striking action part 21 via the hinge shaft 61. FIG. In this case, the inner restraint 2 and the outer restraint 3 are integrated, and the outer restraint 3 is simply attached to the upper end portion of the steel pipe pile W through which the inner restraint 2 is inserted. can do.
Moreover, not only this but one division piece of an outward restraint tool may be integrally provided with respect to the striking action part by attachment tools, such as a bracket, or welding.

  Further, in the present embodiment, the steel pipe pile driving device that gives a hit from the hammer K1 inserted into the concave portion 24 of the upper end surface of the collar portion 23 is used. However, a convex portion is provided on the upper end surface of the collar portion. The steel pipe pile driving device which has the insertion part inserted with respect to a part, or the holding part hold | gripped may be used. In this case, the hammering and vibration from the hammer of the steel pipe pile driving device are applied to the convex portion of the upper end surface of the flange portion through the fitting portion or the grip portion.

  Moreover, in this Embodiment, although the case where the joint joint 4 was mounted | worn with the upper end part of the steel pipe pile W was described, it cannot be overemphasized that it is applicable also when attaching a pile head joint etc. to the upper end part of a steel pipe pile. Nor.

  Further, in the present embodiment, the case where the outer restraint 3 is divided into the two divided pieces 31 and 32 has been described. However, a flexible metal belt-like end-shaped outer ring that is not stretchable in the circumferential direction is described. A direction restraint may be applied.

  Further, in the present embodiment, the hammer K1 is hit on the upper end of the steel pipe pile W, but the steel pipe pile driving device including the vibration acting part that applies vibration from the hammer to the upper end of the steel pipe pile is applied. May be.

DESCRIPTION OF SYMBOLS 1 Cap for driving 2 Inner restraint tool 3 Outer restraint tool 21 Stroke action part (action part)
22 Step surface (bottom surface)
31, 32 Split piece 311 One end (one side end)
321 One end (the other end)
312 and 322 The other end (end)
34 Hinge shaft 35 Clamping seat 5 Outer restraints 51 to 54 Split piece 511 One end (one side end)
512 Other end (other end)
521 One end (the other end)
522 The other end (one side end)
531 One end (one side end)
532 Other end (other end)
541 One end (the other end)
542 The other end (one side end)
61 Hinge shaft K Steel pipe pile driving device K1 Hammer W Steel pipe pile

Claims (5)

A driving cap that is placed on the upper end of the steel pipe pile when the steel pipe pile is driven into the soil by vibration or hammering from the hammer of the steel pipe pile driving device,
An inner restraint that is inserted from above with respect to the inner peripheral surface of the steel pipe pile, and restrains the upper end portion of the steel pipe pile radially inward so as not to be plastically deformable,
Provided at the upper end portion of the inner restraint, the lower end surface abuts against the upper end surface of the steel pipe pile, and an action portion that causes vibration and hammering from the hammer,
The steel pipe piles are fastened so that the fastening seats extending in the circumferential direction along the outer peripheral surface of the steel pipe pile are formed in a ring shape with ends and projecting radially outward from the one end and the other end in the circumferential direction. An outer restraint for restraining the upper end portion of the steel pipe pile radially outward so as not to be plastically deformable,
With
The inner restraint is formed to have an outer diameter such that a gap that suppresses deformation in the radial inner direction of the steel pipe pile due to vibration or hammering from the hammer to less than an elastic limit point exists with respect to the inner diameter of the steel pipe pile. While being
The outer restraint is formed with an inner diameter such that a gap that suppresses deformation of the steel pipe pile radially outward due to vibration or hammering from the hammer to less than an elastic limit point exists with respect to the outer diameter of the steel pipe pile. A cap for driving a steel pipe pile driving device.   The said outer restraint tool is a cap for driving of the steel pipe pile driving device of Claim 1 provided in the said action part integrally.   The outer restraint device is divided into a plurality of divided pieces in the circumferential direction, and ends of the divided pieces adjacent to each other in the circumferential direction are supported so as to be rotatable around a hinge axis extending in the vertical direction. A cap for driving the steel pipe pile driving device according to claim 1 or 2.   The outer restraint member is divided into a plurality of divided pieces in the circumferential direction, and the divided pieces adjacent to each other in the circumferential direction protrude radially outward from one end and the other end in the circumferential direction, respectively. The cap for driving of the steel pipe pile driving device according to claim 1, which is fastened so as to be close to each other. When a steel pipe pile is driven into the soil by vibration or hammering from a hammer of a steel pipe pile driving device, a driving method using a driving cap that covers the upper end of the steel pipe pile,
An inner restraint formed with an outer diameter such that a gap that suppresses deformation inward in the radial direction of the steel pipe pile due to vibration and hammering from the hammer to less than an elastic limit point exists with respect to the inner diameter of the steel pipe pile is upward. The upper end of the steel pipe pile was constrained so as to be incapable of plastic deformation radially inward, and the lower end of the action portion provided at the upper end of the inner restraint was brought into contact with the upper end surface of the steel pipe pile. rear,
An outer end of an annular end formed with an inner diameter such that there is a gap with respect to the outer diameter of the steel pipe pile that suppresses the deformation of the steel pipe pile in the radially outward direction due to vibration and hammering from the hammer to less than the elastic limit point. The restraint is fastened so that the fastening seats projecting radially outward from one end and the other end in the circumferential direction are brought close to each other, and the upper end portion of the steel pipe pile cannot be plastically deformed radially outward. A driving method using a cap for driving a steel pipe pile driving device characterized by being restrained to a steel.

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