JP2016098622A - Lower leader attaching/detaching tool for pile driver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lower leader attaching/detaching tool for a pile driver that enables safe and easy attaching/detaching work for a lower leader without suspending the lower leader by a crane.SOLUTION: A lower leader attaching/detaching tool 41 comprises: a front support frame body 43 comprising a front support member 43a abutting on the front of a guide rail 28 of a second lower leader 20; a rear support frame body 44 comprising a rear support member 44a coupled to a lower part of the support frame body 43 to be raised, and abutting on the back of the guide rail 28 when raised; a first coupling pin 46 coupling the rear support frame body 44 and front support frame body 43 together to maintain the raised state of the rear support frame body 44; a second coupling pin 47 coupling the front support frame body 43 and guide rail 28 together and coupling the front support frame body 43 and guide rail 28 together; and a jack 45 configured to elevate the second lower leader 20 having its front and rear held between the rear support frame body 44 and front support frame body 43.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lower leader attaching / detaching jig of a pile driving machine, and more particularly, to a lower leader attaching / detaching jig used when attaching and detaching a lower leader to a lower end of a leader provided in the pile driving machine.

  As a dual-purpose machine that can perform steel pipe pile embedding work and ground improvement work with a single pile driver, a lower leader is detachably attached to the lower end of the leader. In steel pipe pile embedding work, the work moves up and down along the leader. Work with the lower leader attached to increase the stroke of the equipment, and in ground improvement work, work with the lower leader removed to increase the diameter of the excavation head at the lower end of the rod Is known. However, in order to attach and detach the lower leader, it is necessary to attach and detach the bolt that connects the lower leader and the upper reader with a flange while the lower leader is suspended by a crane. It may take a long time. In addition, when transporting a dual-purpose machine, the work device is held in the lower leader part and the upper leader is tilted backwards. It becomes necessary to attach and detach the lower leader. For this reason, it is a dual-purpose machine that raises and lowers the work device with the rack and pinion method, and by increasing and decreasing the stroke of the work device during the steel pipe pile embedding work by attaching and detaching the rack provided in front of the lower leader, the ground improvement work There has been proposed one in which the diameter of the excavation head at the time of performing is increased (see, for example, Patent Document 1).

JP 2006-291634 A

  However, although the diameter of the excavation head can be increased to some extent by attaching and detaching the rack in front of the lower leader, it has been necessary to use an excavation head having a smaller diameter than that for attaching and detaching the lower leader.

  Therefore, an object of the present invention is to provide a lower leader attaching / detaching jig for a pile driving machine capable of safely and easily attaching and detaching a lower leader.

  In order to achieve the above object, the lower leader attaching / detaching jig of the pile driving machine of the present invention is a lower leader attaching / detaching jig used when attaching and detaching the lower leader to the lower end portion of the leader provided in the pile driving machine. A front support frame that stands vertically on the ground plate and contacts the front surface of the lower reader, and a lower supporter that sandwiches the lower support between the front support frame and the rear surface of the lower reader. A front support frame body, a rear support frame body, and a lower support frame body, wherein the lower leader is sandwiched so as to be movable up and down between the front support frame body and the rear support frame body. A detachable first connecting member that connects the two, a detachable second connecting member that connects the front support frame or the rear support frame and the lower reader, and a jack that raises and lowers the lower reader. It is characterized by.

  Further, in the lower leader attaching / detaching jig of the pile driving machine of the present invention, the rear support frame is connected to the lower end of the rear support frame so as to be rotatable to the lower part of the front support frame by a connecting shaft. And a mounting portion for the first connecting member is provided at each of an upper end portion of the rear support frame body and an upper end portion of the front support frame body. The portion support frame includes a pair of front support members that respectively contact the front surfaces of a pair of guide rails provided on both sides of the lower leader, and the rear support frame contacts each of the rear surfaces of the guide rail. A pair of rear surface support members in contact with each other is provided, and the pair of rear surface support members are connected by a connection member.

  According to the lower leader attaching / detaching jig of the pile driving machine of the present invention, when removing the lower leader, the pile driving machine is run with the working device raised to the upper leader, and the front support frame The lower leader is inserted into the front support frame from behind, the front surface of the lower leader is brought into contact with the front support frame, the rear support frame is brought into contact with the rear surface of the lower reader, and the first connecting member The lower leader is sandwiched between the front support member and the rear support member, and the lower leader is supported by the jack, so that the lower leader can be removed and held by the lower reader attachment / detachment jig. The lower reader may be attached by reversing this procedure. Therefore, it is not necessary to hang the lower leader with a crane when attaching and detaching the lower leader, and the lower leader can be attached and detached safely and easily. Further, since the lower leader can be easily removed, a large-diameter excavation head can be easily used.

It is a side view which shows the state which made the lower leader attachment / detachment jig | tool which shows one example of this invention hold | maintain a lower leader. It is II-II sectional drawing of FIG. It is a front view which shows the state which similarly made the lower leader attachment / detachment jig hold | maintain a lower leader. It is a back view similarly. It is principal part explanatory drawing which shows the pile driver of a transport state. It is principal part explanatory drawing which shows the state which raised the upper leader to the intermediate position from the transport state. It is principal part explanatory drawing of the state which connected the lower flange of the upper leader, and the flange of a connection member. It is principal part explanatory drawing of the state which removed the link attached to the lower leader from the bracket. It is principal part explanatory drawing of the state which raised the working device to the upper leader. It is principal part explanatory drawing of the state which inserted the lower leader in the lower leader attachment / detachment jig, and made the jack contact | abut to the lower leader. It is principal part explanatory drawing of the state which removed the connection volt | bolt between a lower leader and a connection member, and isolate | separated the lower leader from the upper leader. It is principal part explanatory drawing of the state which hold | maintained the lower leader to the lower leader attachment / detachment jig. It is a side view of the pile driver in the state which constructs a steel pipe pile. It is a side view of the pile driving machine of the state currently used as a ground improvement machine. It is a side view of a pile driver in a transportation state.

  The pile driving machine shown in this embodiment is a dual-purpose machine capable of switching between steel pipe pile construction and ground improvement construction, and is provided on the lower traveling body 11 and the lower traveling body 11 in a turnable manner. An upper swing body 12, a leader 13 that can be raised and lowered on a front bracket 12 a provided at the front of the upper swing body 12, and a backstay 14 that supports the leader 13 from the rear of the upper swing body 12. The leader 13 is provided with a working device 15 such as an auger that can be moved up and down along the leader 13, and a top sheave 16 around which a plurality of wire ropes are wound is provided at the top of the leader 13. ing.

  The reader 13 includes a basic reader 17 attached to the front bracket 12a, a plurality of upper readers 18 connected to the upper portion of the basic reader 17, a first lower reader 19 connected to the lower portion of the basic reader 17, and a first reader 2 lower reader 20. Each reader | leader 17, 18, 19, 20 is connected so that attachment or detachment is possible by making flange 17a, 18a, 19a, 20a face each other and fastening with several volt | bolts 21, 22, 23, 24, respectively. Further, one end of a link member 25 is attached to the rear side surface of the second lower reader 20 so as to be rotatable by a support shaft 26. The other end of the link member 25 is detachably attached to the front bracket 12a by a connecting pin 27 when the lower readers 19 and 20 are separated and the upper side of the reader 13 is tilted backward. 20 is connected to the front bracket 12a.

  A pair of left and right guide rails 28 and 28 are slidably engaged with the guide gibs 15a of the working device 15 at the front end portions on both sides of the leader 13, and are provided on the working device 15 in the center of the front surface of the leader 13. A rack 29 with which the lifting pinion engages is provided over substantially the entire length in the axial direction of the reader 13.

  When steel pipe pile embedding work is performed, as shown in FIG. 13, the second lower leader 20 is attached to the lower end of the leader 13, and the lower anchor 30 a for steel pipe piles is disposed at the lower end of the second lower leader 20. In this state, a steel pipe pile (not shown) is attached to the work device 15 via the drive rod 15b.

  When performing ground improvement work, as shown in FIG. 14, while disposing the second lower leader 20 from the lower end of the reader 13, the hollow rod lower brace 30b is disposed in the first lower leader 19 part, A hollow rod 34 equipped with a drilling head 33 having a drilling blade 31 and a stirring blade 32 at the lower end is inserted and held in the working device 15, and a grout hose 36 is connected to the upper end of the hollow rod 34 via a swivel joint 35. .

  When transporting the pile driver, as shown in FIG. 15, the first lower leader 19 and the basic leader 17 are separated from each other while the work device 15 is supported by the second lower leader 20, and the basic leader 17. The upper part from the top to the bottom is laid back.

  When it is necessary to attach or detach the lower leaders 19 and 20 due to the attachment or detachment of the second lower leader 20 for switching the construction contents, transportation or replacement of the upper leader, etc., the lower part of the structure shown in FIGS. A reader attaching / detaching jig 41 is used. The lower leader attaching / detaching jig 41 shown in the present embodiment supports the second lower leader 20 in an upright state, and is erected in the vertical direction from the ground plate 42 and both sides in the width direction of the ground plate 42. A front support frame 43 having a pair of front support members 43a and 43a that abut against the front surfaces 28a and 28a of the guide rails 28 and 28, respectively, and a lower end portion thereof is rotatable to a lower portion of the front support frame 43. And a rear support frame 44 provided with a pair of rear surface support members 44a and 44a that are provided so as to be able to rise and fall rearward and abut against the rear surfaces 28b and 28b of the guide rails 28 and 28, respectively. The jack 45 is disposed at the center and contacts the lower surface of the second lower reader 20 to raise and lower the second lower reader 20.

  The front support frame 43 is rearward in a state along the outer surface of the guide rail 28 from the rear surface of each front support member 43a, and the front support member 43a formed wider than the width dimension of the front surface 28a of the guide rail 28. A rear reinforcing plate 43b extending forward and a front reinforcing plate 43c extending forward from the lower front surface of each front support member 43a.

  The rear support frame 44 is made of an angle member composed of the rear support member 44a that contacts the rear surface 28b of the guide rail 28 when standing, and the rear reinforcing piece 44b that is in a state along the inner surface of the rear reinforcing plate 43b. The lower end portion of the rear reinforcing piece 44b is pivotally connected to the lower portion of the rear reinforcing plate 43b via the connecting shaft 48, and as shown in phantom lines in FIGS. And as shown by a solid line, it is formed so as to rotate to a holding position standing upright in the vertical direction. In addition, a connecting member 44c for connecting the left and right rear reinforcing pieces 44b to each other and rotating them integrally is provided at an intermediate portion in the vertical direction of the rear reinforcing piece 44b. Moreover, the 1st connection pin 46 which is a 1st connection member which hold | maintains the rear part support frame body 44 in a standing position is provided in the upper end part rear side of each rear part reinforcement board 43b, and the upper end part of the standing rear part reinforcement piece 44b. First connecting pin insertion portions 43d, 44d for insertion through attachment are provided, respectively, on the front side of the upper end portion of the rear reinforcing plate 43b, a second engagement hole 28c formed in the guide rail 28 is connected to the second. A second connection pin insertion portion 43e for inserting a second connection pin 47, which is a second connection member that supports the lower reader 20, is provided. A first connection pin support tube 46a for supporting the first connection pin 46 and a second connection pin for supporting the second connection pin 47 on the outside of the first connection pin insertion portion 43d and the outside of the second connection pin insertion portion 43e. Support cylinders 47a are provided, and beta pins 46b and 47b for retaining the connection pins 46 and 47 can be attached to the outer ends of the support cylinders 46a and 47a, respectively. In addition, a guide plate 43f whose rear side is open is provided on the upper portion of the rear reinforcing plate 43b.

  Next, a description will be given of a procedure for setting the pile driver in a transported state to a specification for performing ground improvement work using the lower leader attaching / detaching jig 41. First, as shown in FIGS. 5 and 15, the pile driving machine in the transport state lowers the work device 15 to the lower end portion of the second lower leader 20, and the other end portion of the link member 25 is connected to the front bracket by the connecting pin 27. The upper side of the reader 13 separated from the first lower leader 19 is laid backward along the upper part of the upper swing body 12 while being connected to the first lower leader 19.

  From this transport state, the upper side of the reader 13 is raised as shown in FIG. 6, and the upper side of the reader 13 is erected in the vertical direction as shown in FIG. In this state, after the first lower leader 19 is connected to the upper leader by flange connection, as shown in FIG. 8, the connecting pin 27 is replaced so that the other end of the link member 25 is connected to the side surface of the second lower leader 20. The second lower leader 20 and the front bracket 12a are disconnected from each other. As a result, the working device 15 can be moved up and down along the guide rail 28. As shown in FIG. 9, the working device 15 is raised to the upper side of the reader 13, and the entire reader 13 is inclined backward. Let In this state, the lower traveling body 11 is operated to travel toward the lower leader attaching / detaching jig 41.

  The lower leader attaching / detaching jig 41 removes the first connecting pin 46 and the second connecting pin 47, and puts the rear support frame 44 in a standby state in the horizontal direction. Then, as shown in FIG. 10, the second lower leader 20 is operated while operating the lower traveling body 11 and raising the reader 13 so that the second lower leader 20 is arranged behind the lower leader attaching / detaching jig 41. 20 is inserted from the rear of the lower leader attaching / detaching jig 41 between the rear reinforcing plates 43b of the lower leader attaching / detaching jig 41, and the front surface of the guide rail 28 is brought into contact with the front support member 43a. At this time, the second lower leader 20 can be easily inserted into a predetermined position by the guide plate 43f, and a slight misalignment can be eliminated by the movement of the lower leader attaching / detaching jig 41.

  The front support frame body 43 and the rear part are formed by raising the rear support frame body 44 and inserting the first connection pin 46 through the first connection pin insertion parts 43d and 44d and fixing the first connection pin 46 with the beta pin 46b. The second lower leader 20 is sandwiched between the support frame body 44 and held so as to be movable up and down. Next, the jack 45 is extended so that the front end surface of the jack 45 is brought into contact with the lower surface of the second lower reader 20 so that the second lower reader 20 is supported by the jack 45. In this state, the plurality of bolts 24 connecting the flange 20a provided at the upper end portion of the second lower reader 20 and the flange 19a provided at the lower end portion of the first lower reader 19 are removed.

  Next, as shown in FIG. 11, the jack 45 is contracted to lower the second lower leader 20, and the second connection pin 47 is inserted from the second connection pin insertion portion 43 e into the locking hole 28 c of the guide rail 28. By fixing with the beta pin 47b, the second lower reader 20 is separated from the upper reader, and the vertical direction of the second lower reader 20 is fixed and held in the lower reader attaching / detaching jig 41.

  Then, as shown in FIG. 12, the pile driving machine is moved backward to a predetermined position, and the hollow rod 34 equipped with the excavation head 33 is attached to the work device 15 to obtain the ground improvement work specification shown in FIG. be able to. On the other hand, the lower leader attaching / detaching jig 41 holding the second lower leader 20 is stored in an appropriate place where it is lifted by a crane and does not interfere with the work by attaching an eyebolt or the like to the flange 20a of the second lower leader 20. I can leave. Moreover, the 2nd lower reader | leader 20 can be attached by performing this procedure reversely.

  In this way, by using the lower leader attaching / detaching jig 41, when the second lower leader 20 is attached / detached, it is not necessary to hang the second lower leader 20 with a crane. It can be done safely and easily in a low position.

  Note that the rear support frame can be formed integrally with the front support frame so as to be rotatable, but the front support frame is composed of a plurality of connecting members separately from the rear support frame. You may make it connect with a body. In this embodiment, the lower reader is divided into an upper first lower reader and a lower second lower reader. However, an integrated lower reader may be used. Furthermore, the lower leader can be efficiently held by sandwiching the front and rear of the guide rail, but if the front and rear of the lower leader can be held by the front support frame and the rear support frame, an arbitrary position can be held. Is possible. Moreover, you may make it a 2nd connection member connect a rear part support frame and a lower leader.

DESCRIPTION OF SYMBOLS 11 ... Lower traveling body, 12 ... Upper turning body, 12a ... Front bracket, 13 ... Leader, 14 ... Back stay, 15 ... Working device, 15a ... Guide give, 15b ... Drive rod, 16 ... Top sheave, 17 ... Basic leader, 17a ... flange, 18 ... upper leader, 18a ... flange, 19 ... first lower leader, 19a ... flange, 20 ... second lower leader, 20a ... flange, 21, 22, 23, 24 ... bolt, 25 ... link member, 26 ... support shaft, 27 ... connecting pin, 28 ... guide rail, 28a ... front surface, 28b ... rear surface, 28c ... locking hole, 29 ... rack, 30a ... lower swinging for steel pipe piles, 30b ... lower swinging for hollow rod 31 ... Excavation blade, 32 ... Stirring blade, 33 ... Excavation head, 34 ... Hollow rod, 35 ... Swivel joint, 36 ... Grout hose, 41 ... Lower leader Demounting jig, 42 ... ground plate, 43 ... front support frame, 43a ... front support member, 43b ... rear reinforcement plate, 43c ... front reinforcement plate, 43d ... first connection pin insertion part, 43e ... second connection Pin insertion part, 43f ... guide plate, 44 ... rear support frame, 44a ... rear surface support member, 44b ... rear reinforcement piece, 44c ... connection member, 44d ... first connection pin insertion hole, 45 ... jack, 46 ... first Connection pin, 46a ... first connection pin support tube, 46b ... beta pin, 47 ... second connection pin, 47a ... second connection pin support tube, 47b ... beta pin, 48 ... connection shaft

Claims (3)

  A lower leader attaching / detaching jig used when attaching / detaching a lower leader to / from a lower end portion of a leader provided in a pile driving machine, wherein the front part is erected in a vertical direction on a ground plate and abuts against a front surface of the lower leader A support frame and a rear support frame that can contact the rear surface of the lower reader and sandwich the lower reader between the lower support and the lower reader. A detachable first connecting member that connects the front support frame and the rear support frame in a state in which the body and the rear support frame can be moved up and down, and the front support frame or the rear support frame A lower leader attaching / detaching jig for a pile driving machine, comprising: a second detachable connecting member for connecting the body and the lower leader; and a jack for raising and lowering the lower leader.   The rear support frame is provided such that a lower end portion of the rear support frame is pivotally connected to a lower portion of the front support frame by a connecting shaft so as to be able to undulate backward, and an upper end of the rear support frame is provided. 2. The lower leader attaching / detaching jig for a pile driving machine according to claim 1, wherein attachment portions for the first connecting member are provided on the upper end portion of the front support frame body.   The front support frame includes a pair of front support members that respectively contact the front surfaces of a pair of guide rails provided on both sides of the lower leader, and the rear support frame is formed on a rear surface of the guide rail. 3. The lower leader attaching / detaching jig for a pile driving machine according to claim 1, wherein the pair of rear supporting members are in contact with each other, and the pair of rear supporting members are connected by a connecting member.

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