JP5818526B2 - Steel pipe pile coupling cap and steel pipe pile construction method - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a steel pipe pile connection cap and a steel pipe pile construction method, and more specifically, to a steel pipe pile connection for connecting a rotary drive device and a steel pipe pile that can be moved up and down along a leader of a pile driver. The present invention relates to a steel pipe pile construction method using the cap and the steel pipe pile coupling cap.

  If a steel pile pile is press-fitted using a pile improvement machine with a ground improvement specification where the lower end of the leader is set high, the protruding height of the steel pipe pile from the ground will remain even if the rotary drive is lowered to the lower end of the leader. Since it becomes high, it may become impossible to connect the lower end of the following steel pipe pile to the upper end of the steel pipe pile previously press-fitted. For this reason, the installation height of the leader relative to the front bracket of the pile driver is formed so that it can be changed, and when the steel pipe pile is press-fitted and buried in the ground, cement milk is injected into the ground at a low position. There has been proposed a pile driving machine in which the leader is changed to a high position for improvement, and a steel pile burying and ground improvement can be performed with one pile driving machine (for example, see Patent Document 1). Moreover, in order to change the rotational speed and torque of a steel pipe pile according to the state of the ground, a transmission may be provided between the rotation drive device and the steel pipe pile (for example, refer to Patent Document 2). In addition, when connecting a steel pipe pile to the output shaft of a rotary drive device, it is widely performed to interpose a connecting cap between the output shaft and the steel pipe pile (for example, refer to Patent Document 3). .

JP 2006-132118 A Japanese Patent No. 4624285 JP-A-11-256577

  However, like the above-mentioned patent document 1, when changing the attachment height of the leader, a crane for lifting and holding the leader is necessary, and there is a problem that a large amount of work is required for the height change. . Moreover, like patent document 2, when a transmission is used, the length of a steel pipe pile must be shortened by the dimension of a transmission, and the steel pipe pile of a general fixed length may not be used. . In this case, it is possible to use a steel pipe pile with a fixed length without changing the attachment height of the leader by making the leader longer than usual, and also using a transmission. However, because there are constraints such as the stability of the pile driver and the total weight of the equipment, it is not necessary to simply lengthen the leader, but only for some pile drivers that combine ground improvement and steel pipe embedding. There are problems such as increased costs and increased production delivery time.

  Therefore, the present invention uses a steel pipe pile having a general length when embedding a steel pipe pile with a pile driving machine with a ground improvement specification or using a transmission to embed a steel pipe pile. It aims at providing the construction method of the steel pipe pile using the cap for steel pipe pile connection made possible, and this steel pipe pile connection cap.

  In order to achieve the above object, a steel pipe pile connection cap according to the present invention is a steel pipe pile connection cap for connecting a rotary drive device and a steel pipe pile that can be moved up and down along a leader of a pile driving machine. The steel pipe pile coupling cap includes a steel pipe pile insertion cylinder having an inner diameter capable of inserting the steel pipe pile in the axial direction from below, a rotation drive device coupling portion provided at an upper end of the steel pipe pile insertion cylinder, and the steel pipe. A protrusion insertion groove provided on the inner peripheral surface of the pile insertion cylinder and protruding from the upper outer periphery of the steel pipe pile; the protrusion insertion groove through which the engagement protrusion can pass in the axial direction of the steel pipe pile insertion cylinder; An upper engaging portion and a lower engaging portion, which are provided adjacent to each other in the circumferential direction of the protrusion insertion groove and are engageable with the engaging protrusion, are provided at the lower portion in the axial direction. Furthermore, the steel pipe pile connection cap of this invention can also connect the said rotational drive apparatus connection part to the said rotational drive apparatus via a transmission.

Also, by using the pre-Symbol steel pipe connection cap, the first construction method of the present invention of the steel pipe pile that buried in the ground by connecting a plurality of steel pipe pile, the lower side of the steel pipe pile coupling cap With the engaging protrusion protruding from the upper outer periphery of the first steel pipe pile inserted inside the steel pipe pile insertion cylinder engaged with the upper engaging portion, the rotary drive device is lowered to remove the first steel pipe pile. After press-fitting into the ground, the first steel pipe pile is released while releasing the engagement between the engaging protrusion of the first steel pipe pile and the upper engaging portion by rotating the steel pipe pile coupling cap about the axis. When the rotary drive device is raised with the engagement protrusions of the first steel pipe piles positioned in the protrusion insertion grooves, the position of the engagement protrusions of the first steel pipe pile becomes a position engageable with the lower engagement portion. By rotating the steel pipe pile coupling cap around the axis, the first steel pipe pile engaging protrusion and the lower engaging portion The rotary drive device is lowered while the first steel pipe pile is rotated by the rotary drive device, and the first steel pipe pile is further press-fitted into the ground, and then the steel pipe pile connection cap is centered on the axis. In a state where the engagement protrusion of the first steel pipe pile and the lower engagement portion are released by rotating and the engagement protrusion of the first steel pipe pile is positioned in the protrusion insertion groove, With the rotary drive device raised while keeping the first steel pipe pile in the press-fitted state, the engaging protrusions projecting from the lower part of the steel pipe pile coupling cap to the upper outer periphery of the second steel pipe pile are inside the protrusion insertion groove. When the upper part of the second steel pipe pile is inserted into the inside of the steel pipe pile insertion cylinder while being inserted into the steel pipe pile, when the position of the engaging projection is at a position engageable with the upper engaging part, the steel pipe pile coupling cap And the second steel pipe pile relative to each other by rotating relative to the axis line After engaging the joint and connecting the second steel pipe pile and the first steel pipe pile, the rotary drive device is lowered while rotating the second steel pipe pile with the rotary drive device, and the first steel pipe is lowered. The second steel pipe pile connected to the pile is press-fitted into the ground, and then the engagement between the engaging protrusion and the upper engaging portion is released by rotating the steel pipe pile connecting cap around the axis. With the engagement protrusion positioned in the protrusion insertion groove, the rotary drive device is lifted, and when the position of the engagement protrusion reaches the position where the lower engagement portion can be engaged, the steel pipe pile coupling cap is After engaging the engaging protrusion and the lower engaging portion by rotating about the axis, the second drive pipe is lowered by rotating the second steel pipe pile while rotating the second steel pipe pile. The pile is press-fitted into the ground while being connected to the first steel pipe pile. Construction method, the engaging projection in a state of being engaged in the lower engagement portion which projects from below the front Symbol steel pipe pile coupling cap on the top outer periphery of the first steel pipe pile inserted into the interior of the steel pipe pile insertion tube, After the rotary drive device is lowered and the first steel pipe pile is press-fitted into the ground, the steel pipe pile coupling cap is rotated about the axis to turn the engagement protrusion and the lower engagement portion of the first steel pipe pile. after the engagement projection of the first steel pipe as well as releasing the engagement in a state of being positioned in the projection insertion groove increases the rotational drive device while maintaining the first steel pipe pile fitting state of the, Insert the upper part of the second steel pipe pile into the inside of the steel pipe pile insertion tube while inserting the engaging protrusion protruding from the lower part of the cap for connecting the steel pipe pile into the protrusion insertion groove from below the second steel pipe pile, When the position of the engaging protrusion reaches the position where it can engage with the upper engaging portion, the steel pipe pile coupling cap and the second The steel pipe pile is relatively rotated about the axis to engage the engaging protrusion and the upper engaging portion, and the second steel pipe pile and the first steel pipe pile are connected and then rotated. While rotating the second steel pipe pile with the drive device, the rotary drive device is lowered and the second steel pipe pile connected to the first steel pipe pile is press-fitted into the ground, and then the steel pipe pile connection cap is centered on the axis. And the engagement protrusion is disengaged from the upper engagement portion and the rotation drive device is lifted with the engagement protrusion positioned in the protrusion insertion groove. When the engaging position is engaged with the lower engaging portion, the engaging projection and the lower engaging portion are engaged with each other by rotating the steel pipe pile coupling cap around the axis, and then rotated. While rotating the second steel pipe pile with the drive device, the rotary drive device is lowered and the second steel pipe pile is moved to the second position. It is characterized in that pressed into the ground in a state linked to the steel pipe pile.

  Furthermore, the construction method of the steel pipe pile of the present invention is the method in which the first steel pipe pile is press-fitted into the ground in a state where the first steel pipe pile and the second steel pipe pile are connected, and then the second steel pipe pile is connected to the first steel pipe pile. By repeating the same operation as connecting and press-fitting to the steel pipe, the third and subsequent steel pipe piles are connected to the steel pipe pile that was previously buried in the connected state and press-fitted into the ground. It is characterized by being embedded in

  According to the present invention, the upper engagement portion and the lower engagement portion are provided in the steel pipe pile connection cap for connecting the output shaft of the rotary drive device and the steel pipe pile, so that the upper and lower engagement portions are predetermined. Even when embedding a steel pipe pile with a ground improvement specification pile driver, the steel pipe pile is press-fitted with the engaging projections of the steel pipe pile engaged in this order. Even if a transmission is interposed, the protruding height of the steel pipe pile after press-fitting can be reduced, so there is no need to change the installation height of the leader or use a special leader longer than usual. It becomes possible to connect and embed a plurality of steel pipe piles having a general length. In particular, the steel pipe pile coupling cap according to the present invention only needs to connect the rotary drive device connecting portion provided on the upper part to the rotary drive device directly or via a transmission, so that the amount of work is hardly increased. Pile can be press-fitted and buried efficiently.

  Therefore, since the steel pipe pile can be embedded simply by connecting the steel pipe pile coupling cap of the present invention to the rotary drive device of the ground improvement specification pile driving machine, the ground improvement specification pile driving machine can be replaced with the steel pipe pile installation specification. It is not necessary to change, and it is possible to cope with the ground improvement work and the steel pipe pile burying work only by preparing the steel pipe pile connection cap, and the use efficiency of the pile driving machine can be improved.

It is a side view of the pile driving machine which shows the state which embeds a steel pipe pile with the pile driving machine of a ground improvement specification using the steel pipe pile connection cap of this invention. It is a partial cross section front view which shows one example of a steel pipe pile connection cap. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is a side view of a pile driver which shows the state which performs ground improvement work with a pile driver of a ground improvement specification. It is explanatory drawing which shows an example of the procedure which embeds a steel pipe pile by this invention method using the cap for steel pipe pile connection of this invention. It is a principal part side view of the pile driver which shows the state which embeds a steel pipe pile using a transmission.

  First, in FIG. 1 to FIG. 4, the pile driving machine 11 shown in the present embodiment is manufactured mainly with specifications for ground improvement as shown in FIG. 4, and is turned to the upper part of the lower traveling body 12. An upper swing body 13 provided so as to be able to be supported, a leader 14 provided on the front portion of the upper swing body 13 via a front bracket so as to be able to rise and fall, a back stay 15 for supporting the leader 14 from the rear, and the reader 14, a rotary drive device 16 provided so as to be movable up and down, a chain and sprocket drive type lift device 17 that raises and lowers the rotary drive device 16 along the reader 14, and a steady rest provided on the front surface of the drive device 17. And a member 18. The reader 14 includes a pair of guide rails 19 along the longitudinal direction, and the rotary drive device 16 is attached to the guide rails 19 via a guide gib 16a so as to be movable up and down.

  The rotation drive device 16 includes a mounting portion 16b having the guide give 16a, a main body portion 16d in which a hydraulic motor 16c is disposed at an upper portion thereof, and a speed reduction mechanism is accommodated therein. An output shaft 16e that is rotationally driven by the motor 16c is provided in a projecting manner, and a connection attachment 20 is attached to the lower portion of the output shaft 16e.

  The connection attachment 20 includes a connection tube 20a having a connection recess (not shown) having a hexagonal cross section that is open at the bottom, and a flange portion 20b provided at the upper end of the connection tube 20a. The flange portion 20b is detachably connected to the lower flange of the output shaft 16e with a plurality of bolts. A steel pipe pile 22 is connected to the connection attachment 20 via a steel pipe pile connection cap 21 (see FIG. 1), and the excavation head 24a and the stirring blade are connected via a rod connection member 23. By connecting the hollow rod 24 provided with 24b and connecting a grout hose (not shown) via the swivel joint 25 to the upper part of the rotation drive device 16, the ground improvement work is performed.

  As shown in FIGS. 2 and 3, the steel pipe pile coupling cap 21 has a steel pipe pile insertion cylinder 21a having an inner diameter capable of inserting the steel pipe pile 22 in the axial direction from below, and an upper end of the steel pipe pile insertion cylinder 21a. A hexagonal columnar rotary drive device connecting portion 21b that is fixed by welding, protrudes upward and is inserted into the connecting recess 20 of the connecting attachment 20, and an inner peripheral surface facing position of the steel pipe pile insertion tube 21a. A pair of engaging projections 22a projecting from opposite positions on the outer periphery of the upper portion of the steel pipe pile 22 can pass in the axial direction of the steel pipe pile insertion cylinder 21a, an upper portion in the axial direction of the projection insertion groove 21c, and An upper engaging portion 21d and a lower engaging portion 21e, which are provided adjacent to each other in the circumferential direction of the protrusion insertion groove 21c and to which the engaging protrusion 22a can engage, are provided at the lower portion in the axial direction. 21 d of upper engaging parts and the lower engaging part 21e are formed in the state which penetrated the surrounding wall of the steel pipe pile insertion cylinder 21a inside and outside, and it expands toward the lower end part internal peripheral surface of the steel pipe pile insertion cylinder 21a toward the downward direction. An open conical guide surface 21f is provided.

  On the other hand, the rod connecting member 23 has a lower portion of the cylindrical body 23a fixed to the upper end of the hollow rod 24, and a hollow connecting portion (not shown) having the same outer shape as the rotary drive device connecting portion 21b on the upper portion of the cylindrical body 23a. The hollow rod 24 is mounted on the same axis with respect to the output shaft 16e of the rotary drive device 16 by inserting the connecting portion into the connecting concave portion of the connecting attachment 20. .

  Further, the steady member 18 is provided with a pair of left and right arms that can be opened and closed on a bracket provided on the front surface of the driving device 17, and closes both arms and inserts a pin 18a into the tip engaging portion. Thus, the steel pipe pile 22 and the hollow rod 24 are held so as to be rotatable and movable in the axial direction.

  The leader 14 in the ground improvement specification raises the rotary drive device 16 to the ascent limit with respect to the leader 14, and the excavation head 24a provided at the lower end of the hollow rod 24 is lifted from the ground, above the excavation head 24a. The agitating blade 24b located is arranged at a position higher than the leader (see FIG. 6) in the pile driver with the steel pipe pile embedding specification so as not to interfere with the leader 14 including the steadying member 18 and the lifting device 17.

  When the ground improvement is performed using the pile improvement machine 11 of the ground improvement specification, as shown in FIG. 4, the connection attachment 20 attached to the output shaft 16 e of the rotation drive device 16 is attached to the upper end of the hollow rod 24. The attached rod connecting member 23 is connected, the hollow rod 24 is held by the steady member 18, and a grout hose is connected to the upper part of the rotation driving device 16 via a swivel joint 25. In this state, while rotating the hollow rod 24 by the rotation drive device 16, the rotation drive device 16 is lowered along the reader 14 by the elevating device 17 and supplied from the swivel joint 25 into the hollow rod 24 to A predetermined ground improvement operation is performed by stirring the cement milk flowing out from the tip and the earth and sand excavated by the excavation head 24a with the agitating blade 24b.

  On the other hand, when performing the embedding work of the steel pipe pile 22 using the pile improvement machine 11 of the ground improvement specification, the rod connecting member 23 is extracted from the connecting attachment 20 to remove the hollow rod 24, and the steel pipe is connected to the connecting attachment 20. The pile connection cap 21 is connected. At this time, the attachment 20 for connection is replaced | exchanged by forming in the same shape the outer surface shape of the connection part of the rod connection member 23, and the outer surface shape of the rotational drive apparatus connection part 21b of the cap 21 for steel pipe pile connection. In addition, the rod connecting member 23 and the steel pipe pile connecting cap 21 can be easily exchanged in a state where the rotary drive device 16 is lowered to the lower end of the reader 14. Further, the swivel joint 25 may be detached from the rotation drive device 16. Further, as the steel pipe pile 22, a steel pipe pile having the engagement protrusion 22a welded in advance to the upper outer peripheral surface is used.

  First, as shown in FIG. 1, the upper outer periphery of the first steel pipe pile 22 from below the steel pipe pile coupling cap 21 with the rotary drive device 16 raised to the upper end of the leader 14 by the lifting device 17. The upper portion of the first steel pipe pile 22 is inserted into the steel pipe pile insertion cylinder 21a while inserting the engaging protrusion 22a projecting into the protrusion insertion groove 21c. When the first steel pipe pile 22 is raised and the engagement protrusion 22a is in a position where it can engage with the upper engagement portion 21d, the rotary drive device 16 rotates the steel pipe pile connection cap 21 slightly in the forward direction. The engaging protrusion 22a is moved to the upper engaging portion 21d to move the engaging protrusion 22a and the upper engaging portion 21d into an engaged state. Thereby, the output shaft 16e of the rotation drive device 16, the attachment 20 for connection, the steel pipe pile connection cap 21 and the steel pipe pile 22 are connected with their rotation axes aligned.

  When engaging the engaging protrusion 22a and the upper engaging portion 21d, the upper engaging portion 21d penetrates the peripheral wall of the steel pipe pile insertion cylinder 21a inward and outward, so that the raised position of the engaging protrusion 22a and the upper engaging portion The engagement state with 21d can be visually confirmed from the outside of the steel pipe pile coupling cap 21. Further, if the steel pipe pile 22 can be rotated, the steel pipe pile 22 is rotated without rotating the steel pipe pile coupling cap 21, and the engagement protrusion 22a and the upper engagement portion 21d are engaged. May be.

  The upper portion of the first steel pipe pile 22 is held by the steel pipe pile coupling cap 21 by the engagement between the engagement protrusion 22a and the upper engagement portion 21d, and the arm of the steadying member 18 is closed and the arm is fixed by the pin 18a. In the state where the lower part of the first steel pipe pile 22 is held by the steady member 18, the rotary drive device 16 is driven by the lifting device 17 while the first steel pipe pile 22 is rotated in the forward direction by the rotary drive device 16. 14, the side surface on the rear side in the rotation direction of the upper engagement portion 21 d pushes the side surface of the engagement protrusion 22 a in the rotation direction, and the upper surface of the upper engagement portion 21 d moves over the upper surface of the engagement protrusion 22 a. By pushing downward, the first steel pipe pile 22 is pressed into the ground while rotating. The steadying member 18 pulls out the pin 18a before the steel pipe pile coupling cap 21 that descends hits to fully open the arm.

  As shown in FIG. 5A, when the rotary drive device 16 is lowered to the lowest end (downward limit) of the reader 14, the rotary drive device 16 and the lifting device 17 are temporarily stopped, and then the rotary drive device 16 is slightly changed. , The engagement protrusion 22a is disengaged from the upper engagement portion 21d, and the engagement protrusion 22a is positioned in the protrusion insertion groove 21c. Next, the rotary drive device 16 is slightly raised along the reader 14 by the lifting device 17 while keeping the first steel pipe pile 22 press-fitted into the ground, and the engagement protrusion 22a, the lower engagement portion 21e, After the steel pipe pile connection cap 21 is raised to a position where the steel pipe pile connection cap 21 can be engaged, the steel pipe pile connection cap 21 is slightly rotated in the forward direction by the rotation drive device 16 so that the engagement protrusion 22a is moved to the lower engagement portion 21e. Engage with.

  As shown in FIG. 5 (b), with the engagement protrusion 22a and the lower engagement portion 21e engaged, the rotary drive device 16 again rotates the first steel pipe pile 22 in the forward direction while moving up and down. The rotary drive device 16 is lowered to the lower end of the reader 14 by the device 17, and the first steel pipe pile 22 is further press-fitted into the ground. Thereby, as shown in FIG.5 (c), the 1st steel pipe pile 22 will be in the state press-fitted in the ground only by the dimension according to the distance of the upper engaging part 21d and the lower engaging part 21e, The protruding height of the steel pipe pile 22 can be made lower than the protruding height in the state shown in FIG.

  After press-fitting the first steel pipe pile 22 to a predetermined position, the rotation drive device 16 is slightly rotated in the reverse direction to release the engagement between the engagement protrusion 22a and the lower engagement portion 21e, and the engagement protrusion 22a. Is positioned in the protrusion insertion groove 21c, and the rotary drive device 16 is raised to the upper end of the reader 14 by the elevating device 17 while keeping the first steel pipe pile 22 pressed into the ground.

  And as shown in FIG.5 (d), while inserting the engagement protrusion 22a of the 2nd steel pipe pile 22N in the protrusion penetration groove | channel 21c from the downward direction of the cap 21 for steel pipe pile connection, it is the upper part of 2nd steel pipe pile 22N. Is inserted into the steel pipe pile insertion cylinder 21a, and when the engaging protrusion 22a is in a position where it can engage with the upper engaging portion 21d, the rotary drive device 16 slightly moves the steel pipe pile coupling cap 21 in the forward direction. By rotating, the engaging protrusion 22a is engaged with the upper engaging portion 21d. Next, the rotary drive device 16 is slightly lowered to connect the upper end 22b of the first steel pipe pile 22 and the lower end 22c of the second steel pipe pile 22N by welding or the like. The rotary drive device 16 is lowered to the lowest end of the reader 14 by the lifting device 17 while rotating the steel pipe pile in a state where the steel pipe pile 22 and the second steel pipe pile 22N are connected in the forward direction.

  Thereby, since the 2nd steel pipe pile 22N will be in the same state as the 1st steel pipe pile 22 shown to Fig.5 (a), engagement of the engagement protrusion 22a is carried out from the upper engaging part 21d similarly to the above. By repeating the operation of changing to the lower engaging portion 21e and further press-fitting into the ground, the upper portion of the second steel pipe pile 22N protrudes from the ground by a predetermined amount. Therefore, by repeating the operations shown in FIGS. 5 (a) to 5 (d) for the third and subsequent steel pipe piles, a plurality of steel pipe piles are set in advance in a state where they are connected to the steel pipe piles that have been press-fitted first. It is possible to embed it by press-fitting to the specified depth.

  Thus, the steel pipe pile connection cap 21 is connected to the connection attachment 20 connected to the output shaft 16e of the rotary drive device 16 in the pile driving machine 11 of the ground improvement specification instead of the hollow rod 24 for improving the ground. By doing, it can respond to the steel pipe pile embedding construction using the steel pipe pile 22 of a general fixed length.

  FIG. 6 is a steel pipe laying specification pile driving machine in which a speed change device 26 is interposed between the rotary drive device 16 and the steel pipe pile 22, and the rotational speed of the steel pipe pile 22 is changed according to the state of the ground. A part of the work procedure for press-fitting is shown. In addition, the same code | symbol is attached | subjected to what shows the component similar to the pile driver of the said example shown in FIG. 1 thru | or FIG. 5, and the detailed description is abbreviate | omitted.

  The transmission 26 disposed below the rotary drive device 16 includes a pair of guide gibs 26a that hold the guide rails 19 on the rear side, and rotates to a connecting portion 26c positioned above the transmission main body 26b in the attached state. The rotation drive device connecting portion 21b of the steel pipe pile connecting cap 21 is inserted and connected to the connecting portion 26d positioned below the transmission main body 26b with the output shaft 16e of the driving device 16 attached. As a result, the steel pipe pile coupling cap 21 is coupled to the rotary drive device 16 via the transmission 26, and the leader 14 is lifted and lowered integrally with the rotary drive device 16 by the lifting device 17. The rotation drive device 16 and the steel pipe pile connection cap 21 can be connected to the transmission 26 via an appropriate connection attachment as necessary. Moreover, in the pile driving machine of steel pipe embedding specification, since it is not necessary to avoid the excavation head 24a and the stirring blade 24b of the hollow rod 24, the steadying member 18 is provided in the lower part of the drive device 17, and the rotary drive device 16 is placed in a low position. It is formed so that it can be lowered.

  Thus, also in the pile driving machine of the steel pipe embedding specification using the transmission 26, the work procedure similar to the work procedure when the steel pipe pile connection cap 21 is used in the above-described pile improvement machine 11 of the ground improvement specification is repeated. Thus, a plurality of steel pipe piles 22 can be connected and buried in the ground.

  That is, the same procedure as the procedure from FIG. 1 to FIG. 5A to FIG. 5C is performed, and as shown in FIG. The first steel pipe pile 22 is press-fitted into the ground in a state where the protrusion 22a and the lower engaging portion 21e of the steel pipe pile coupling cap 21 are engaged. Thereby, since the 1st steel pipe pile 22 is press-fit in the lower part of the steel pipe pile connection cap 21 connected to the downward direction of the transmission 26, a steel pipe pile is not attached to the transmission 26 without using the steel pipe pile connection cap 21. It can be made lower than the protrusion height of the 1st steel pipe pile 22 when 22 is connected and the steel pipe pile 22 is press-fit.

  Next, the engagement between the engagement protrusion 22a and the lower engagement portion 21e is released to raise the rotary drive device 16 to the upper end of the reader 14, and the second steel pipe pile 22N of the second steel pipe pile 22N is raised as in FIG. The engaging protrusion 22 a is engaged with the upper engaging portion 21 d of the steel pipe pile coupling cap 21. At this time, since the protruding height of the first steel pipe pile 22 is low, as shown in FIG. 6B, the upper end 22b of the first steel pipe pile 22 and the lower end 22c of the second steel pipe pile 22N Does not interfere with each other, and the first steel pipe pile 22 and the second steel pipe pile 22N can be positioned apart upward. Hereinafter, by repeating the same procedure as described above, the third and subsequent steel pipe piles can be connected to the steel pipe pile that has been previously press-fitted and press-fitted into the ground.

  Therefore, both when the ground improvement specification pile driver 11 is used and when the transmission 26 is used in a steel pipe embedding specification pile driver, the upper engagement portion 21d and the lower engagement portion provided in the steel pipe pile connection cap 21 are used. By press-fitting the steel pipe pile 22 using the joint portion 21e in order, the steel pipe pile 22 can be deeply pressed compared to when the steel pipe pile coupling cap 21 is not used, and the upper protrusion of the steel pipe pile after press-fitting Since the height can be lowered, it is possible to use a steel pipe pile having a general length.

  In addition, this invention is not restricted to each above-mentioned form example, The raising / lowering of a rotational drive apparatus can employ | adopt arbitrary drive means, and the connection between steel pipe piles can be performed by welding, screwing, etc. it can. The configuration of the base machine is also arbitrary.

  DESCRIPTION OF SYMBOLS 11 ... Pile driver, 12 ... Lower traveling body, 13 ... Upper turning body, 14 ... Leader, 15 ... Back stay, 16 ... Rotation drive device, 16a ... Guide give, 16b ... Mounting part, 16c ... Hydraulic motor, 16d ... Main body Part, 16e ... output shaft, 17 ... lifting device, 18 ... steadying member, 18a ... pin, 19 ... guide rail, 20 ... attachment for connection, 20a ... connection cylinder, 20b ... flange part, 21 ... cap for steel pipe pile connection , 21a ... Steel pipe pile insertion cylinder, 21b ... Rotation drive coupling part, 21c ... Projection insertion groove, 21d ... Upper engagement part, 21e ... Lower engagement part, 21f ... Guide surface, 22 ... Steel pipe pile, 22a ... Engagement Projection, 23 ... Rod connecting member, 24 ... Hollow rod, 24a ... Excavation head, 24b ... Stirring blade, 25 ... Swivel joint, 26 ... Transmission, 26a ... Guide-gib, 26b ... Transmission 26c, 26d ... connecting part

Claims (5)

A steel pipe pile coupling cap for connecting a steel pipe pile to a rotary drive device provided so as to be movable up and down along a leader of the pile driving machine, the steel pipe pile coupling cap extending from the lower side in the axial direction. A steel pipe pile insertion cylinder having an inner diameter that can be inserted into the steel pipe pile, a rotation drive device connecting portion provided at an upper end of the steel pipe pile insertion cylinder, and an upper outer periphery of the steel pipe pile provided on an inner peripheral surface of the steel pipe pile insertion cylinder The projecting engagement protrusions are provided in the axial direction of the steel pipe pile insertion cylinder, and are provided adjacent to the circumferential direction of the projection insertion groove on the upper and lower axial directions of the projection insertion groove. A steel pipe pile coupling cap comprising an upper engaging portion and a lower engaging portion that are engageable with each other. The steel pipe pile coupling cap according to claim 1, wherein the rotational driving device coupling portion is coupled to the rotational driving device via a transmission. It is a construction method of the steel pipe pile which uses the steel pipe pile connection cap of Claim 1 or 2 and connects several steel pipe piles and embeds it in the ground, Comprising: Steel pipe pile insertion from the downward direction of the said steel pipe pile connection cap In a state where the engaging protrusions projecting from the upper outer periphery of the first steel pipe pile inserted into the inside of the cylinder are engaged with the upper engaging portion, the rotary drive device is lowered to bring the first steel pipe pile into the ground. After the press-fitting, the steel pipe pile coupling cap is rotated around the axis to release the engagement between the engagement protrusion of the first steel pipe pile and the upper engagement portion and the engagement of the first steel pipe pile. When the protrusion is positioned in the protrusion insertion groove, the rotary drive device is raised, and when the position of the engaging protrusion of the first steel pipe pile becomes a position that can be engaged with the lower engaging portion, the steel pipe pile By engaging the coupling cap around the axis, the engagement projection and the lower engagement portion of the first steel pipe pile The are engaged, after the press-fitting the first pipe pile lowers the rotary drive while rotating the first steel pipe piles further into the ground with the rotary drive device, the steel pipe pile coupling cap around the axis In a state where the engagement protrusion of the first steel pipe pile and the lower engagement portion are released by rotating and the engagement protrusion of the first steel pipe pile is positioned in the protrusion insertion groove, With the rotary drive device raised while keeping the first steel pipe pile in the press-fitted state, the engaging protrusions projecting from the lower part of the steel pipe pile coupling cap to the upper outer periphery of the second steel pipe pile are inside the protrusion insertion groove. When the upper part of the second steel pipe pile is inserted into the inside of the steel pipe pile insertion cylinder while being inserted into the steel pipe pile, when the position of the engaging projection is at a position engageable with the upper engaging part, the steel pipe pile coupling cap And the second steel pipe pile relative to each other by rotating relative to the axis line After engaging the joint and connecting the second steel pipe pile and the first steel pipe pile, the rotary drive device is lowered while rotating the second steel pipe pile with the rotary drive device, and the first steel pipe is lowered. The second steel pipe pile connected to the pile is press-fitted into the ground, and then the engagement between the engaging protrusion and the upper engaging portion is released by rotating the steel pipe pile connecting cap around the axis. With the engagement protrusion positioned in the protrusion insertion groove, the rotary drive device is lifted, and when the position of the engagement protrusion reaches the position where the lower engagement portion can be engaged, the steel pipe pile coupling cap is After engaging the engaging protrusion and the lower engaging portion by rotating about the axis, the second drive pipe is lowered by rotating the second steel pipe pile while rotating the second steel pipe pile. A method for constructing a steel pipe pile, wherein the pile is press-fitted into the ground while being connected to the first steel pipe pile. . It is a construction method of the steel pipe pile which uses the steel pipe pile connection cap of Claim 1 or 2 and connects several steel pipe piles and embeds it in the ground, Comprising: Steel pipe pile insertion from the downward direction of the said steel pipe pile connection cap In a state where the engaging protrusions protruding from the upper outer periphery of the first steel pipe pile inserted into the cylinder are engaged with the lower engaging portion, the rotary drive device is lowered to bring the first steel pipe pile into the ground. After press-fitting, by rotating the steel pipe pile coupling cap around the axis, the engagement between the first steel pipe pile and the lower engagement portion is released and the first steel pipe pile is engaged. After raising the rotary drive device while keeping the first steel pipe pile in a press-fitted state with the protrusion positioned in the protrusion insertion groove, the upper part of the second steel pipe pile from below the steel pipe pile coupling cap The upper part of the 2nd steel pipe pile is inserted into the protrusion insertion groove while the engaging protrusion protruding from the outer periphery is inserted into the steel pipe pile. The steel pipe pile coupling cap and the second steel pipe pile are relatively centered about the axis when the inner pipe is inserted and the position of the engaging projection is such that the upper engaging portion can engage with the upper engaging portion. The engaging protrusion and the upper engaging portion are engaged with each other by rotating and the second steel pipe pile and the first steel pipe pile are connected, and then the second steel pipe pile is rotated by the rotation drive device. While the rotary drive device is lowered, the second steel pipe pile connected to the first steel pipe pile is press-fitted into the ground, and then the steel pipe pile connecting cap is rotated about the axis to engage with the engaging protrusion. The position where the engagement protrusion is engageable with the lower engagement portion by releasing the engagement with the upper engagement portion and raising the rotation driving device with the engagement protrusion positioned in the protrusion insertion groove. When the steel pipe pile connection cap is turned around the axis, After engaging the engaging portion, the rotary drive device is lowered while rotating the second steel pipe pile with the rotary drive device, and the second steel pipe pile is connected to the first steel pipe pile in the ground. A steel pipe pile construction method characterized by press-fitting . After press-fitting into the ground with the first steel pipe pile and the second steel pipe pile connected, the same operation as the operation of connecting and press-fitting the second steel pipe pile to the first steel pipe pile is repeated. The third and subsequent steel pipe piles are connected to a steel pipe pile embedded in a connected state first, and are press-fitted into the ground to embed a plurality of steel pipe piles in the ground. Of steel pipe piles .

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