JP2019167769A - Pile driver - Google Patents

Abstract

An object of the present invention is to provide a pile driver having a structure capable of easily, safely and reliably raising and lowering a long leader. A leader 15 is provided at the front of an upper revolving structure 13 so as to be able to undulate, a pair of left and right back stays whose upper and lower ends are respectively connected to a back surface of the leader and a rear portion of the upper revolving structure, A gantry 17 provided at the rear of the vehicle, an up / down winch provided at the upper swing body, an up / down rope 18 wound around the up / down winch, a pendant rope 19 connected to the back of the leader, an up / down rope 18 and the pendant A middle sheave block 20 for connecting the rope 19 is provided. The connecting position between the leader 15 and the pendant rope 19 is higher than に お け る in the length direction of the reader 15 and lower than the connecting position between the leader and the backstay. At the back of the leader above the connection position between the leader 15 and the pendant rope 19, Da hanging provided connecting portion 27 of the rope. [Selection diagram] Fig. 1

Description

  The present invention relates to a pile driver, and more particularly, to a large pile driver equipped with a long leader, particularly a long leader having a length of 50 m or more.

  Large pile driver is generally provided on the upper part of the lower traveling body provided with a crawler so that the upper turning body can be turned via a turning bearing, and the leader can be raised and lowered at the front part of the upper turning body, During work, the leader is supported by a pair of left and right backstays from the rear of the upper swing body. In addition, the reader is assembled and disassembled in a state where it is laid down forward, and when the reader in an assembled state in which the reader members including the backstay are connected is erected, a pendant connected to the back surface of the reader The rope is connected to the hoisting rope through the middle sheave block, and the hoisting rope is wound up by the hoisting winch through the gantry erected at the rear of the upper swing body (for example, see Patent Documents 1 and 2). .) Usually, the pendant rope is connected to an intermediate leader member for connecting a back stay provided at a portion to which the back stay is connected together with the upper end of the back stay, and the intermediate leader member for connecting the back stay according to the length of the leader. By appropriately setting the connecting position, the leader support force by the back stay is obtained. In addition, when the leader is long, assisting using a companion crane when standing the leader is also performed.

JP 10-1949 A JP2011-140799A (FIG. 4)

  On the other hand, in recent pile driving machines, it is desired to construct deeper in one pile driving work, and in some large pile driving machines, a long leader with a length of 50 m or more should be installed. Is being carried out. However, when the leader becomes longer, the strength of each member of the leader must be increased in order to reliably support the working device such as an auger, and the weight of the leader increases as compared with a leader having a general length. Become. Further, the back stay also needs to be lengthened in an improved state in order to support the upper part of the reader, and the weight of the assembled leader in which the respective leader members including the back stay are connected is greatly increased. When a long leader whose weight has been significantly increased is lifted by a companion crane, a large bending moment is generated at the position where the leader is suspended due to the weight of the leader and the backstay, and the deflection of the leader increases. There was a risk that the leader connection bolt would break.

  For this reason, it is also carried out that the leader is erected with two cranes in a state where the upper part and the intermediate part of the assembled leader are suspended, but it is not easy to balance the two cranes. Usually, in addition to the companion crane that works together with the pile driver, it is necessary to prepare another crane for raising and lowering the leader, and there is a problem that the procurement of the crane and the work place must be secured. Further, a similar problem occurs when the leader is laid down after the work is finished.

  Therefore, an object of the present invention is to provide a pile driving machine having a structure capable of easily and safely raising and lowering a long leader by cooperative work of hoisting rope hoisting and lifting with an accompanying crane.

  In order to achieve the above object, a pile driving machine of the present invention includes a base machine provided with an upper turning body so as to be turnable on an upper portion of a lower traveling body, and a leader provided so as to be able to undulate at a front portion of the upper turning body. A pair of left and right back stays whose upper ends are connected to the rear surface of the reader and whose lower ends are connected to the rear part of the upper swing body, a gantry provided in a undulating manner at the rear part of the upper swing body, and the upper swing A undulating winch provided at the center rear of the body, a undulating rope wound around the undulating winch, a pendant rope connected to the back of the leader, and a middle sheave block connecting the undulating rope and the pendant rope A connecting device between the leader and the pendant rope at a position higher than ½ in the length direction of the leader, the leader and the backs As well as disposed below the connecting position with the over, above the reader back the connecting position between the reader and the pendant rope is characterized in that a connecting portion of the unwound reader hanging ropes from a crane.

  Further, in the pile driving machine of the present invention, the pendant rope is connected to the leader by a pendant rope connecting leader intermediate member connected to the middle of the leader in the longitudinal direction. A backstay intermediate support member for supporting the intermediate portion of the backstay is provided.

  According to the pile driving machine of the present invention, the connection position of the pendant rope to the leader is provided below the connection position with the backstay and above 1/2, and the leader suspension rope is connected above the connection position. When the leader is raised and lowered by the provision of the section, it is a long leader with a length of 50 m or more due to the lifting force by the companion crane via the hanging rope and the lifting force by the raising and lowering rope via the pendant rope. In addition to being able to undulate in a balanced manner, the number of necessary companion cranes can be reduced to one.

It is a side view which shows an example of the pile driver of this invention, and shows an example of the disassembled assembly state which made the leader lie down ahead of the base machine. It is a side view which shows the operation state which made the leader stand up in the base machine front part. It is a side view of the principal part.

  First, as shown in FIG.1 and FIG.2, the pile driving machine 11 shown to this embodiment is a three-point type large pile driving machine, Comprising: On the upper part of the lower traveling body 12 provided with the crawler via a turning bearing. A base machine 14 provided with the upper turning body 13 so as to be turnable, a reader 15 provided so as to be able to rise and fall via a leader bracket 13a provided at the front portion of the upper turning body 13, and an upper rear surface of the reader 15 And a pair of left and right back stays 16 connected to the upper surface of an outrigger provided at the rear portion of the upper swing body 13 and having a lower end connected to the upper portion of the upper swing body 13 as a leader raising / lowering means. A gantry 17 provided in a undulating manner, a undulating winch (not shown) provided in the central rear portion of the upper swing body 13, a undulating rope 18 wound around the undulating winch, A pair of left and right pendant rope 19 connected to the rear of the reader 15, and a middle sheave block 20 for connecting the hoist cable 18 and the pendant rope 19. Further, a backstay lower support member 13b is provided at the tip of the leader bracket 13a.

  The hoisting rope 18 rises upward from the hoisting winch, passes through a guide sheave provided at the upper end of the gantry 17, and passes through a plurality of sheaves of the middle sheave block 20 and a plurality of sheaves of the gantry sheave block 17 a provided at the upper end of the gantry 17. The leader 15 can be raised and lowered via the hoisting rope 18, the middle sheave block 20 and the pendant rope 19 by operating the hoisting winch.

  The back stay 16 includes an upper stay member 16a whose upper end is coupled to the upper portion of the reader 15, a lower stay member 16b whose upper end is coupled to the lower end of the upper stay member 16a via an intermediate support member 21, The stay cylinder 16c is connected to the lower end of the lower stay member 16b, and the rod tip that is the lower end of the stay cylinder 16c is connected to the upper surface of the outrigger.

  The reader 15 is formed by connecting a plurality of long and short reader members 15a, and a backstay connecting reader intermediate member 22 for connecting the backstay 16 is inserted into a predetermined upper position. A pendant rope connecting reader intermediate member 23 is inserted at a predetermined position of the intermediate portion. The backstay connecting leader intermediate member 22 is, like the conventional backstay connecting leader intermediate member, a stay connecting piece 22a for connecting the tip of the upper stay member 16a serving as the upper end of the backstay 16 to the lower part on the back side. Are provided at two places, and an intermediate sheave 25 for guiding the main rope and the sub rope 24 passing between the two back stays 16 is provided at two places above the stay connecting piece 22a.

  As shown in FIG. 3, the leader intermediate member 23 for connecting the pendant rope has a cylindrical main body 23a, connecting flanges 23b and 23b provided at both ends of the main body 23a, and a back side of the main body 23a. It has a connecting bracket 23c provided and a ladder portion 23d provided on the side surface of the main body 23a, and a rope connecting hole 23e for connecting the pendant rope 19 to the lower part of the connecting bracket 23c is provided. A support member connecting portion 23f for connecting the base end of the intermediate support member 21 is provided at the intermediate portion of the connecting bracket 23c, and a pendant rope connecting reader intermediate member 23 is provided at the protruding end of the connecting bracket 23c. A hanging ear 23g is provided for lifting with a crane with the axis line oriented in the horizontal direction. Further, guide rails 23h for guiding a working device such as an auger are provided on both sides of the front surface of the main body 23a.

  The connecting position of the leader intermediate member 23 for connecting the pendant rope in the reader 15 is set to be higher than ½ in the length direction of the reader 15 and lower than the reader intermediate member 22 for connecting the backstay, and has fallen forward. The raising and lowering rope 18 and the pendant rope 19 extending from the upper end of the standing gantry 17 toward the pendant rope connecting leader intermediate member 23 with respect to the axis of the leader 15 in the state have sufficient assisting force to raise and lower the leader 15. The angle is set to be obtained.

  A suspension rope connecting portion 27 for connecting the leader suspension rope 26 a unwound from the companion crane 26 is provided above the leader intermediate member 23 for connecting the pendant rope in the leader 15. In this embodiment, when assembling or disassembling the reader 15, one of the hanging ears used when the leader member 15a is lifted by a crane with the axis line in the horizontal direction is used.

  In the pile driving machine 11 thus formed, when the leader 15 is raised and lowered, as shown in FIG. 1, the gantry 17 is raised and the raising and lowering rope 18 and the pendant rope 19 are connected via the middle sheave block 20. Then, the pendant rope 19 is connected to the pendant rope connecting leader intermediate member 23, and the leader hanging rope 26 a from the accompanying crane 26 is connected to the hanging rope connecting portion 27. In FIG. 1, the upper end is connected to the backstay connecting leader intermediate member 22, the intermediate portion is supported by the intermediate support member 21, and the lower end is supported by the backstay lower support member 13b. The stay 16 is not shown.

  In the state shown in FIG. 1, the leader suspension rope 26 a is wound up and the undulation rope 18 is wound up, so that the leader upper end portion is lifted by the leader suspension rope 26 a and the leader intermediate portion that acts from the undulation rope 18 through the pendant rope 19. Thus, the lifting force (tensile force) acts on the reader 15 at the same time, and the long reader 15 can be erected without being greatly bent. Similarly, when the standing leader 15 is laid down, the leader 15 can be laid down without being greatly bent.

  Therefore, by the cooperative work of one companion crane and the leader hoisting means provided in the base machine 14, the hoisting work of the ultra-long leader having a length of 50 m or more and further 60 m is performed safely and smoothly. be able to. Further, by performing the undulation work of the reader 15 in this way, the strength improvement of the reader 15 due to the lengthening can be suppressed to a minimum, and the increase in weight can also be made slight.

  Further, an intermediate support member 21 that supports the intermediate portion of the back stay 16 is provided on the pendant rope connecting reader intermediate member 23 that connects the pendant rope 19, and the back stay 16 is divided vertically by the intermediate support member 21. Also in the backstay 16, the strength improvement can be minimized, and the increase in weight can be made small. Thereby, the burden of the leader hanging rope 26a and the pendant rope 19 when the leader 15 is raised and lowered can be reduced, and the raising and lowering work of the leader 15 can be performed more easily and safely.

  The connecting position of the leader intermediate member 23 for connecting the pendant rope in the reader 15 can be appropriately set according to various conditions such as the length and strength of the reader 15 and the state of the base machine 14, and the position of the leader hanging rope 26a. Similarly, it can be set as appropriate.

  DESCRIPTION OF SYMBOLS 11 ... Pile driver, 12 ... Lower traveling body, 13 ... Upper turning body, 13a ... Leader bracket, 13b ... Backstay lower support member, 14 ... Base machine, 15 ... Leader, 15a ... Leader member, 16 ... Backstay, 16a ... Upper stay member, 16b ... Lower stay member, 16c ... Stay cylinder, 17 ... Gantry, 17a ... Gantry sheave block, 18 ... Hoisting rope, 19 ... Pendant rope, 20 ... Middle sheave block, 21 ... Intermediate support member, 22 ... Backstay connecting leader intermediate member, 22a ... Stay connecting piece, 23 ... Pendant rope connecting leader intermediate member, 23a ... Main body, 23b ... Connecting flange, 23c ... Connecting bracket, 23d ... Ladder, 23e ... Rope connecting hole , 23f: support member connecting portion, 23g: hanging ear, 23h: guide rail, 24 Main rope, auxiliary rope 25 ... intermediate sheave, 26 ... partaker cranes, 26a ... reader hanging rope 27 ... hanging rope connecting portion

Claims (2)

  A base machine provided with an upper turning body so as to be able to turn on the upper part of the lower traveling body, a leader provided on the front part of the upper turning body so as to be raised and lowered, an upper end connected to the rear surface of the leader, and a lower end connected to the lower end A pair of left and right back stays connected to the rear part of the upper swing body, a gantry provided to be able to undulate at the rear part of the upper swing body, a undulation winch provided at the center rear part of the upper swing body, and the undulation winch In the pile driving machine comprising a hoisting rope wound around, a pendant rope connected to the back surface of the leader, and a middle sheave block connecting the hoisting rope and the pendant rope, the leader and the pendant rope And a connecting position between the leader and the backstay is arranged above 1/2 in the length direction of the leader and below the connecting position between the leader and the backstay. Above the reader back the connecting position between the reader and the pendant rope, pile driver, characterized in that a connecting portion of the unwound reader hanging ropes from a crane.   The pendant rope is connected to the leader by a pendant rope connecting leader intermediate member connected to the middle of the leader in the longitudinal direction, and the pendant rope connecting leader intermediate member supports a middle portion of the backstay. The pile driving machine according to claim 1, further comprising a stay intermediate support member.

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