JP6953072B2 - How to install the leader bracket of the pile driver - Google Patents

Description

The present invention relates to a method of attaching a leader bracket pile driver, particularly, a method for Mounting reader bracket for supporting the reader provided on pile driver.

When transporting a large pile driver, it is common practice to separate the leader bracket that supports the leader, which is a component, from the upper swing body and transport it separately. For this reason, a simple pin-type connection structure is adopted so that the leader bracket can be easily attached and detached at the site. In such a pile driver, the connecting arm provided at the rear of the leader bracket is inserted into the gap between the bifurcated leader bracket mounting arms provided at the front of the upper swing body, and the pin insertion holes provided at these overlapping portions are inserted. A pin-type connecting device that aligns with each other and manually inserts connecting pins is known (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2001-295273

When attaching the leader bracket to the upper swing body, it is usually performed in a state where the leader bracket is lifted and held by a crane. For this reason, there is a problem that the leader bracket shakes with the operation of the crane and the positions of the pin insertion holes do not match, so that the connecting pin cannot be smoothly inserted. However, the one described in Patent Document 1 does not describe anything about efficiently aligning the pin insertion holes.

Therefore, an object of the present invention is to provide a pile driver provided with a leader bracket that facilitates the alignment of pin insertion holes with a simple structure and enables quick and easy attachment work to the upper swing body.

In order to achieve the above object, in the method of attaching the leader bracket of the crane driving machine of the present invention, the upper swing body is rotatably provided on the upper part of the lower traveling body provided with the crawler via the swing bearing to support the leader. A leader bracket mounting arm for connecting the leader bracket is provided at the front portion of the upper swing body, and is connected to a pin insertion hole provided at a overlapping portion between the connecting arm provided at the rear portion of the leader bracket and the leader bracket mounting arm. In a crane driving machine in which the leader bracket is attached to the front portion of the upper swing body via the connecting pin by inserting a pin, the leader bracket mounting arm is provided on the upper tip of the leader bracket mounting arm. It has a first mounting portion and a second mounting portion provided at the lower part of the tip, and a horizontal support shaft provided at the rear portion of the first mounting portion, and the connecting arm is a rear end of the connecting arm. A first connecting portion provided on the upper portion, a second connecting portion provided on the lower part of the rear end, and a guide member that projects rearward from the first connecting portion and can be locked to the support shaft from above. The first pin insertion hole is provided in the overlapping portion between the first mounting portion and the first connecting portion, and the second pin insertion hole is provided in the overlapping portion between the second mounting portion and the second connecting portion. The guide member is formed with a downward U-shaped engaging groove that engages with the outer peripheral surface of the support shaft, and the first pin insertion hole of the first mounting portion and the first connecting portion are first. The 1-pin insertion hole is a state in which the first connecting pin can be inserted when the leader bracket is rotated in the vertical direction around the support shaft in a state where the guide member is locked to the support shaft. The second pin insertion hole of the second mounting portion and the second pin insertion hole of the second connecting portion are formed at such positions, centering on the first connecting pin inserted into the first pin insertion hole. When the two connecting portions are rotated downward and the guide member is rotated upward to release the locked state between the guide member and the support shaft, the second connecting pin becomes insertable. It is a method of attaching the leader bracket of the pile driving machine formed at the position, in which the leader bracket is suspended in a state of being inclined forward and upward by a crane until the engaging groove is located above the support shaft. The crane is moved and operated in the winding direction to engage the engaging groove with the support shaft, and the crane is operated in the winding direction to obtain the first pin insertion hole of the first mounting portion and the said. How to lower the crane by aligning the positions of the first pin insertion holes of the first connecting portion and inserting the first connecting pin. It is characterized in that the second connecting pin is inserted by matching the positions of the second pin insertion hole of the second mounting portion and the second pin insertion hole of the second connecting portion by operating in the direction.

According to the pile driver of the present invention, when the leader bracket lifted by the crane is attached to the upper swing body, the guide member provided on the connecting arm is brought into contact with the support shaft provided on the leader bracket attaching arm to attach the leader bracket. Since it can be stably supported, the alignment of the first pin insertion hole can be easily performed, and the leader bracket can be rotated around the axis of the first connecting pin, so that the alignment of the second pin insertion hole is also easy. Can be done. Further, as the leader bracket rotates, the second connecting pin can be inserted while the guide member is separated from the support shaft, and the guide member is pressed against the support shaft during pile construction to damage the support shaft. Can be prevented.

Further, since the U-shaped engaging groove is engaged with the support shaft, it is possible to suppress the swing of the leader bracket due to the hoisting operation of the crane, and the alignment of the first pin insertion hole is more stable. It can be carried out.

It is a side view of the pile driver which shows one embodiment of this invention. Similarly, it is explanatory drawing which shows one form example of the leader bracket mounting process. Similarly, it is an explanatory view of a main part in a state where the connecting arm is brought close to the leader bracket mounting arm. Similarly, it is an explanatory view of a main part in a state where a guide member is engaged with a support shaft and a first connecting pin is inserted. Similarly, it is an explanatory view of the main part in a state where the guide member is separated from the support shaft and the second connecting pin is inserted. Similarly, it is an enlarged plan view of a main part in a state where the first connecting pin and the second connecting pin are inserted.

1 to 6 show an example of a form of the pile driver of the present invention, and the pile driver 11 shown in the example of the present invention is a lower traveling body 12 provided with a crawler 12a as shown in FIG. An upper swivel body 13 is provided on the upper portion so as to be swivelable. A leader 14 formed by connecting a plurality of leader members and a leader bracket 16 to which a front jack 15 is attached are provided on the front portion of the upper swing body 13, and two leaders 14 erected on the leader bracket 16 are provided. It is supported by the back stays 17 and 17 of. Further, on the front portion of the upper swing body 13, a main winding guide sheave 19 for guiding the main winding rope 18 unwound from the main winding winch (not shown) and a supplementary winding unwound from the auxiliary winding winch (not shown). A supplementary winding guide sheave 21 for guiding the rope 20 is provided. The main winding rope 18 and the auxiliary winding rope 20 are wound around a top sheave 22 provided at the upper end of the leader 14, and are respectively hung on the front portion of the leader 14.

A gantry (A frame) 23 is erected at the rear of the upper swing body 13, and a leader member to which an undulating rope 24 from an undulating winch (not shown) is connected to a back stay 17 via a pendant rope 25. Is connected to. Further, a counterweight 26 is mounted on the rear end portion of the upper swing body 13, and rear jacks 27 are provided on both sides of the frame on which the counterweight 26 is mounted.

As shown in FIG. 2, the leader bracket 16 includes connecting arms 28 provided at two positions on the left and right sides of the rear end portion, a leader base member 29 provided on the front portion, and a sheave bracket 30 provided on the upper surface. The front jacks 15 and 15 provided on both side surfaces are provided. Further, the connecting arm 28 has an upper first connecting portion 28a and a lower second connecting portion 28b, and a guide member 31 protrudes from the rear portion of the first connecting portion 28a in the direction of the upper swivel body 13. It is installed.

As shown in FIGS. 3 to 6, the main frame 13a of the upper swing body 13 is provided with bifurcated leader bracket mounting arms 32 and 32 into which the connecting arms 28 are inserted at two positions on the left and right sides of the front portion. Further, the leader bracket mounting arm 32 has an upper first mounting portion 32a and a lower second mounting portion 32b. Further, the first pin insertion holes 28c and 32c for inserting the first connecting pin 33 into the overlapping portion of the first connecting portion 28a and the first mounting portion 32a are formed with the second connecting portion 28b and the second mounting portion 32b. The second pin insertion holes 28d and 32d for inserting the second connecting pin 34 are provided in the overlapping portion of the above.

Further, a support shaft 35 that engages with the downward U-shaped engaging groove 31a formed in the guide member 31 is inserted into the support shaft insertion hole 32e provided in the first mounting portion 32a to prevent the bolt from coming off. It is fixed at 36.

In this way, the first connecting pin 33 is inserted into the first pin insertion holes 28c and 32c, and the second connecting pin 34 is inserted into the second pin insertion holes 28d and 32d and fixed with a retaining bolt 37, respectively. As a result, the leader bracket 16 is attached to the front portion of the upper swing body 13 via the first connecting pin 33 and the second connecting pin 34.

When transporting such a pile driver 11, work-related devices such as the leader 14 and the leader bracket 16 are removed from the upper swing body 13, and the crawler 12a is removed from the lower traveling body 12, each of which is a large low-floor trailer. Will be shipped separately using.

When attaching the leader bracket 16 to the upper swing body 13 at the site, first, as shown in FIG. 2, the lower surface of the front portion of the track frame 12b located at the center of the lower traveling body 12 is supported by the pedestal 38, and the leader bracket 16 is supported by the pedestal 38. By supporting the rear side of the upper swivel body 13 with the rear jack 27 and the pedestal 39, the upper swivel body 13 is held horizontally. Next, as shown in FIG. 2 (A), while the leader bracket 16 is lifted by the suspension wire 40 of the crane (not shown) and raised to a predetermined height, the crane is operated in the lowering direction. Bring the connecting arm 28 closer to the leader bracket mounting arm 32. Subsequently, the first pin insertion holes 28c and 32c and the second pin insertion holes 28d and 32d, which will be described later, are aligned to insert the first connection pin 33 and the second connection pin 34, respectively. Finally, the suspension wire 40 is removed from the leader bracket 16, and as shown in FIG. 2B, the leader bracket 16 is attached to the front portion of the upper swing body 13 in a cantilevered state.

Here, a procedure for aligning the first pin insertion holes 28c and 32c and the second pin insertion holes 28d and 32d will be described with reference to FIGS. 3 to 6. First, as shown in FIG. 3, the crane is operated to lift the leader bracket 16 in a state of being tilted forward and upward, and the guide member 31 is engaged from a state of being positioned near the upper side of the leader bracket mounting arm 32. The leader bracket 16 is slowly moved in the horizontal direction until the groove 31a is located above the support shaft 35. Next, the crane is operated in the winding direction to engage the engaging groove 31a with the support shaft 35. As a result, the rear portion of the leader bracket 16 is stably supported by the support shaft 35.

Subsequently, the crane is slightly operated in the lowering direction to finely adjust the position of the leader bracket 16 around the support shaft 35, and as shown in FIG. 4, the positions of the first pin insertion holes 28c and 32c are matched. The first connecting pin 33 is inserted in this state. In this state, since the leader bracket 16 is slightly inclined upward with respect to the upper swing body 13, the positions of the second pin insertion holes 28d and 32d still do not match, and the second connecting pin 34 can be inserted. Can not.

In this way, since the engaging groove 31a can be engaged with the support shaft 35 to lower the crane, it is possible to suppress the swing of the leader bracket 16 and the first pin insertion holes 28c and 32c. The alignment of the crane can be performed more stably.

Subsequently, the crane is slightly operated in the lowering direction to finely adjust the position of the leader bracket 16 around the first connecting pin 33, and as shown in FIGS. 5 and 6, the second pin insertion holes 28d and 32d are used. The second connecting pin 34 is inserted in a state where the positions of the above are matched. At this time, the leader bracket 16 is rotated downward by a predetermined angle (for example, 1 degree) around the axis of the first connecting pin 33, and the guide member 31 is moved upward at the same angle around the axis of the first connecting pin 33. It moves in an arc and separates from the support shaft 35.

In this way, the first connecting pin 33 can be inserted into the first pin insertion holes 28c and 32c to lower the crane, so that the leader bracket 16 is rotated around the axis of the first connecting pin 33. This makes it possible to easily align the second pin insertion holes 28d and 32d. Further, as the leader bracket 16 rotates, the guide member 31 can be inserted through the second connecting pin 34 in a state where the guide member 31 is separated from the support shaft 35, and the guide member 31 is pressed against the support shaft 35 during pile construction. It is possible to prevent the support shaft 35 from being damaged.

The shape of the guide member is arbitrary as long as it can abut on the support shaft and stably support the leader bracket, and if the leader bracket can be separated from the support shaft when it rotates around the axis of the first connecting pin. It can be provided at any position. Further, the connecting arm and the guide member can be integrally formed from the steel plate.

11 ... Pile driver, 12 ... Lower running body, 12a ... Crawler, 12b ... Track frame, 13 ... Upper swivel body, 13a ... Main frame, 14 ... Leader, 15 ... Front jack, 16 ... Leader bracket, 17 ... Backstay , 18 ... Main winding rope, 19 ... Main winding guide sheave, 20 ... Supplementary winding rope, 21 ... Supplementary winding guide sheave, 22 ... Top sheave, 23 ... Gantry, 24 ... Undulating rope, 25 ... Pendant rope, 26 ... Counter weight , 27 ... rear jack, 28 ... connecting arm, 28a ... first connecting part, 28b ... second connecting part, 28c ... first pin insertion hole, 28d ... second pin insertion hole, 29 ... leader base member, 30 ... sheave Bracket, 31 ... Guide member, 31a ... Engagement groove, 32 ... Leader bracket mounting arm, 32a ... First mounting part, 32b ... Second mounting part, 32c ... First pin insertion hole, 32d ... Second pin insertion hole, 32e ... Support shaft insertion hole, 33 ... 1st connecting pin, 34 ... 2nd connecting pin, 35 ... Support shaft, 36, 37 ... Bolt, 38, 39 ... Pedestal, 40 ... Suspended wire

Claims (1)

An upper swivel body is provided on the upper part of the lower traveling body provided with a crawler so as to be swivelable via a swivel bearing, and a leader bracket mounting arm for connecting a leader bracket supporting the leader is provided on the front portion of the upper swivel body. By inserting the connecting pin into the pin insertion hole provided in the overlapping portion between the connecting arm provided at the rear portion of the leader bracket and the leader bracket mounting arm, the leader bracket is inserted through the connecting pin to the upper swivel body. In the pile driving machine mounted on the front portion of the above, the leader bracket mounting arm includes a first mounting portion provided on the upper tip of the leader bracket mounting arm, a second mounting portion provided on the lower tip, and the first mounting arm. It has a horizontal support shaft provided at the rear portion of the mounting portion, and the connecting arm has a first connecting portion provided at the upper part of the rear end of the connecting arm and a second connecting portion provided at the lower part of the rear end. And a guide member that protrudes rearward from the first connecting portion and can be locked from above to the support shaft, and a first overlapping portion between the first mounting portion and the first connecting portion. A 1-pin insertion hole is provided, and a second pin insertion hole is provided in each of the overlapping portion of the second mounting portion and the second connecting portion, and the guide member is provided with a downward U that engages with the outer peripheral surface of the support shaft. A character-shaped engaging groove is formed, and the first pin insertion hole of the first mounting portion and the first pin insertion hole of the first connecting portion are in a state where the guide member is locked to the support shaft. The leader bracket is formed at a position where the first connecting pin can be inserted when the leader bracket is rotated about the support shaft in the vertical direction, and the second pin insertion hole of the second mounting portion and the second pin are inserted. The second pin insertion hole of the connecting portion means that the second connecting portion is rotated downward and the guide member is rotated upward about the first connecting pin inserted through the first pin insertion hole. It is a method of attaching a leader bracket of a pile driving machine, which is formed at a position where a second connecting pin can be inserted when the locked state with the support shaft is released.
The leader bracket is suspended by a crane in a state of being inclined forward and upward, and is moved until the engaging groove is located above the support shaft.
The crane is operated in the winding direction to engage the engagement groove with the support shaft.
By operating the crane in the winding direction, the position of the first pin insertion hole of the first mounting portion and the position of the first pin insertion hole of the first connecting portion are matched, and the first connecting pin is inserted.
By operating the crane in the winding direction, the position of the second pin insertion hole of the second mounting portion and the position of the second pin insertion hole of the second connecting portion are matched, and the second connecting pin is inserted. How to attach the leader bracket of the pile driver.

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