JP6987455B2 - Construction machinery and how to assemble construction machinery - Google Patents

Description

The present invention relates to a construction machine, and more particularly to a construction machine having an undulating gantry on the upper swivel body and a method of assembling the construction machine facilitating attachment of the gantry to the upper swivel body.

In construction machines such as cranes and pile drivers, a wire unwound from a winch provided at the rear of the upper swing body is provided on the front part of the upper swing body via a gantry provided at the rear of the upper swing body so as to be undulating. It is connected to a boom or reader. The gantry is a combination of a front leg rotatably attached to the upper swivel body and a hind leg rotatably and extendably formed between the upper end of the front leg and the upper swivel body to form a hind leg. It is formed so that the gantry is in an upright state (working state) when extended, and the gantry is in an inverted state (retracted state) when the hind legs are contracted.

When transporting a construction machine equipped with such a gantry, the gantry is separated from the upper swing body and transported separately. For this reason, when mounting the gantry on site, the front and rear legs of the gantry are fixed to each other via a link that prevents the gantry from opening, so that the pins of the front and rear legs can be inserted even when the gantry is lifted by a crane. A gantry support structure is known that can stably align the holes with the pin insertion holes of the upper swing body corresponding to them (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 9-278368

However, in the above-mentioned gantry support structure, since the relative rotation between the front leg and the rear leg is restricted by the link, when either the front leg or the rear leg of the suspended gantry is connected to the upper swing body, On the other hand, there is no choice but to adjust the alignment of the pin insertion holes by rotating them in the vertical direction by operating the crane, and the positions of the pin insertion holes do not match due to the influence of the backlash of each movable part of the gantry. There was a problem such as. 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 construction machine and a method for assembling a construction machine equipped with a gantry that can be easily attached to an upper swing body with a simple structure.

In order to achieve the above object, the construction machine of the present invention has a pair of left and right front legs whose lower ends are rotatably and detachably mounted on the front side of the upper swing body, and the upper ends of which rotate to the upper ends of the front legs. In a construction machine in which a gantry equipped with a pair of left and right rear legs that can be detachably mounted and whose lower end is rotatable and detachably mounted on the rear side of the upper swivel body is detachably provided on the upper swivel body. The upper end of the gantry is connected to the front leg-side connecting arm provided on the rear surface of the front leg, and the lower end is connected to the rear leg-side connecting arm provided on the front surface of the rear leg. The rear leg suspension link has a rear leg suspension link that holds the relative angle formed by the front leg and the rear leg at a preset angle, and the rear leg suspension link is connected to the front leg side while maintaining the relative angle. By inserting the front leg side connecting pin into the front leg side pin insertion hole provided in the overlapping portion of the arm and the rear leg hanging link, the upper end portion of the rear leg hanging link is interposed via the front leg side connecting pin. By inserting the rear leg side connecting pin into the rear leg side pin insertion hole provided in the overlapping portion of the rear leg side connecting arm and the rear leg hanging link, respectively, the rear leg is connected to the front leg. The lower end of the hanging link is connected to the rear leg via the rear leg side connecting pin, and at least one of the front leg side pin insertion hole and the rear leg side pin insertion hole attaches the gantry to the upper swing body. It is characterized in that it is formed in an elongated hole whose relative angle can be adjusted when it is mounted.

Further, on the rear surface of the front leg and the front surface of the rear leg, mounting arms for attaching a position adjusting jig for moving the front leg side connecting pin or the rear leg side connecting pin along the elongated hole are provided, respectively. It is characterized by being.

Further, in the method of assembling the construction machine of the present invention, a pair of left and right front legs whose lower end is rotatably and detachably attached to the front side of the upper swing body and the upper end can be rotated to the upper end portion of the front leg. A method of assembling a construction machine in which a gantry equipped with a pair of left and right rear legs that are mounted and detachably mounted on the rear side of the upper swivel body at the lower end is detachably provided on the upper swivel body. In the gantry, the upper end is connected to the front leg side connecting arm provided on the rear surface of the front leg, and the lower end is connected to the rear leg side connecting arm provided on the front surface of the rear leg. The hind leg hanging link has a hind leg hanging link that holds the relative angle between the front leg and the hind leg at a preset angle, and the hind leg hanging link holds the relative angle and is on the front leg side. By inserting the front leg side connecting pin into the front leg side pin insertion hole provided in the overlapping portion of the connecting arm and the rear leg hanging link, the upper end portion of the rear leg hanging link connects the front leg side connecting pin. The rear leg side connecting pin is connected to the front leg via the rear leg side connecting pin, and the rear leg side connecting pin is inserted into the rear leg side pin insertion hole provided in each of the overlapping portions of the rear leg side connecting arm and the rear leg suspension link. The lower end of the leg suspension link is connected to the rear leg via the rear leg side connecting pin, and at least one of the front leg side pin insertion hole and the rear leg side pin insertion hole attaches the gantry to the upper swing body. When the gantry is mounted on the upper swing body, the gantry is lifted while maintaining the relative angle, and the front legs are mounted on the front legs. It is characterized in that a step of connecting to the upper swing body, a step of lifting the rear leg with respect to the front leg to adjust the relative angle, and a step of connecting the rear leg to the upper swing body are performed in order. ..

According to the present invention, at least one of the front leg side pin insertion hole and the rear leg side pin insertion hole provided at both ends of the rear leg suspension link is a long hole in which the relative angle between the front leg and the rear leg can be adjusted. When the gantry is attached to the upper swivel body, the movement direction of the hind legs is combined with the rotation operation of the front legs mounted earlier and the relative rotation operation of the hind legs with respect to the front legs. It is possible to give a degree of freedom to the gantry, and it is possible to easily align the pin insertion holes between the hind legs and the upper swing body and easily attach the gantry. In addition, since mounting arms for mounting the position adjustment jig are provided on the rear surface of the front leg and the front surface of the rear leg, it is possible to adopt a small manual machine as the position adjustment jig, and the gantry can be mounted. It can be done easily and quickly with little effort and operation.

It is a side view of the pile driver which shows one embodiment of this invention. Similarly, it is a side view showing a state in which the gantry is lifted while maintaining the relative angle between the front leg and the rear leg. Similarly, it is an enlarged side view of the main part. FIG. 3 is a sectional view taken along line IV-IV of FIG. Similarly, it is explanatory drawing which shows the transport state of a gantry. Similarly, it is explanatory drawing which shows the stage which connects the front leg at the time of attaching a gantry. Similarly, it is explanatory drawing which shows the step of connecting the hind legs by adjusting a relative angle.

1 to 7 show an example in which the construction machine of the present invention is applied to a pile driver, and the pile driver 11 is a lower traveling body 12 provided with a crawler 12a as shown in FIG. An upper swivel body 14 is provided on the upper portion so as to be swivelable via a swivel bearing 13, and a leader bracket 16 to which a leader (not shown) and a front jack 15 are attached is provided on the front portion of the upper swivel body 14. Has been done.

On the floor frame 14a of the upper swivel body 14, a driver's cab 17 and an equipment room (not shown) are provided on the right side, and an engine room 18 containing an engine and a hydraulic pump is provided on the left side, and the equipment room and the engine room are provided. On the side surface of 18, a plurality of inspection doors 19 and a house elevating ladder 20 are provided. Further, in the front portion of the engine chamber 18, a staircase 21 for moving from the floor frame 14a to the ceiling portion of the engine chamber 18 is provided. Further, at the lower part of the rear end of the upper swing body 14, an outrigger box 23 to which the rear jack 22 is attached and a counterweight (not shown) mounted on the outrigger box 23 are provided. Further, a gantry 24 is provided above the rear portion of the upper swivel body 14.

The gantry 24 includes a guide sheave 26 for guiding the undulating rope 25 unwound from the undulating winch (not shown) provided at the central rear portion of the upper swivel body 14. Further, the undulating rope 25 rises upward from the undulating winch, is hung around the front middle sheave block 27 and the gantry receive block 28 via the guide sheave 26, and the rope end is fixed to the gantry receive block 28. Further, the middle sheave block 27 is connected to the other end of a pendant rope (not shown) whose one end is connected to the reader, and the undulating winch winds up or unwinds the undulating rope 25 to raise the leader. It can be undulated.

Further, as shown in FIGS. 1 and 2, the gantry 24 is rotatable and detachable in the front-rear direction by a rotation pin 30 on a pair of left and right front brackets 29 whose lower ends are provided in the front portion of the upper swing body 14. A pair of left and right front legs 31 mounted on the front leg 31 and a pair of left and right rear legs whose upper end is rotatably mounted on the upper end portion of the front leg 31 via a support shaft 32 and whose lower end is provided at the rear portion of the upper swivel body 14. The side bracket 33 is provided with a pair of left and right rear legs 35 that are rotatably and detachably attached by a rotating pin 34, and a gantry undulating cylinder provided between the lower part and the upper rotating body 14 of each front leg 31. By expanding and contracting the 36, the upper swivel body 14 is provided so as to be undulating at the rear portion. Further, between the front leg 31 and the rear leg 35, a rear leg suspension link 37 that holds the relative angle A formed by the front leg 31 and the rear leg 35 at a preset angle is provided (FIG. 2). .. The relative angle A is set to a small angle, for example, an angle of about 18 degrees so that the crane can be lifted by the lifting wire 38 and transported by a large low-floor trailer in a stable manner.

The front leg 31 has an upper member 31b and a lower member 31c fixed to both ends of a long, square-shaped tubular main body member 31a. Further, the lower member 31c is formed in a bifurcated shape into which the upper end portion of the front bracket 29 is inserted, and is provided with a rotation pin insertion hole 31d into which the rotation pin 30 is inserted.

On the front surface of the front leg 31, a gantry elevating ladder 31e for ascending / descending to the top of the gantry 24 that has been erected, a fixing portion 31f to which the middle sheave block 27 is fixed during transportation, and a plurality of suspension portions to which the suspension wire 38 is attached. 31 g is provided. Further, a cylinder mounting portion 31h to which the gantry undulating cylinder 36 is mounted is provided on the lower rear surface of the front leg 31. Further, on the rear surface of the intermediate portion of the front leg 31, the positions of the front leg side connecting arm 31i to which the upper end portion of the rear leg suspension link 37 is connected and the rear leg 35 described later on the lower side of the front leg side connecting arm 31i. A front leg side mounting arm 31j to which the upper end portion of a lever block (registered trademark, the same applies hereinafter) 39 used as an adjusting jig is mounted is provided.

The rear leg 35 has a tubular lower rear portion having a rectangular cross section and a rotating pin insertion hole 40a through which the rotating pin 34 is inserted at the bifurcated lower end portion into which the upper end portion of the rear bracket 33 is inserted. The legs 40, the upper hind legs 41 made of a long and thick plate material whose upper end is rotatably attached to the upper member 31b of the front legs 31 via the support shaft 32, and the lower hind legs 40 and the upper hind legs. It is a nested telescopic structure including a tubular intermediate connecting member 42 having a rectangular cross section for connecting to 41. Further, on the front surface of the intermediate portion of the lower rear leg 40, a rear leg side connecting arm 40b to which the lower end portion of the rear leg hanging link 37 is connected, and a lever block 39 below the rear leg side connecting arm 40b. A rear leg side mounting arm 40c to which the lower end portion of the is mounted is provided.

As shown in FIGS. 3 and 4, the rear leg suspension link 37 is formed by fixing two flat plate members extending in the vertical direction at predetermined intervals, and the bifurcated portion 37a into which the front leg side connecting arm 31i is inserted into the upper end. However, a bifurcated portion 37b into which the rear leg side connecting arm 40b is inserted is formed at the lower end. Further, in the overlapping portion between the front leg side connecting arm 31i and the bifurcated portion 37a, front leg side pin insertion holes 31k and 37c through which the front leg side connecting pin 43 is inserted are provided, and the rear leg side connecting arm 40b and the bifurcated portion 37b are provided. The overlapping portion of the above is provided with rear leg side pin insertion holes 40d and 37d through which the rear leg side connecting pin 44 is inserted. Further, the rear leg side pin insertion hole 37d can adjust the relative angle A when the rear leg 35 is attached to the upper swing body 14, in other words, the rear leg side connecting pin 44 is the longitudinal length of the rear leg suspension link 37. It is formed into a long hole that can move along the direction.

In this gantry 24, with the rear leg suspension link 37 removed, the gantry undulating cylinder 36 is extended to raise the upper end of the front leg 31, so that the rear leg 35 is extended and the guide sheave 26 is preset. The lower fixing pin 45 is placed in the lower pin insertion hole provided in the overlapping portion between the lower hind leg 40 and the intermediate connecting member 42, and the lower hind leg 41 and the intermediate connecting member are connected to each other. The upper fixing pin 46 is inserted into the upper pin insertion hole provided in the overlapping portion with the 42, and the fixing pins 45 and 46 are prevented from coming off by the beta pin 47. At this time, the upper end of the rear leg suspension link 37 is connected to the front leg side connecting arm 31i by the front leg side connecting pin 43, and the lower end portion is connected to the front leg side mounting arm 31j by the rear leg side connecting pin 44. As a result, it becomes unused and is stored in the longitudinal direction of the rear surface of the front leg 31.

On the other hand, with the fixing pins 45 and 46 removed, the gantry undulating cylinder 36 is reduced to lower the guide sheave 26, so that the rear leg 35 is reduced and the rear surface of the front leg 31 is close to the front surface of the rear leg 35. It becomes a collapsed state (Fig. 2). Further, when the gantry 24 is attached / detached by operating the crane, the lower fixing pin 45 is provided in the lower pin insertion hole provided in advance in the overlapping portion between the lower rear leg 40, the upper rear leg 41 and the intermediate connecting member 42, and the upper rear leg 45 is provided. The upper fixing pin 46 is inserted into the upper pin insertion hole provided in the overlapping portion between the 41 and the intermediate connecting member 42, and the fixing pins 45 and 46 are prevented from coming off by the beta pin 47. At this time, in the rear leg suspension link 37, the rear leg side connecting pin 44 is pulled out from the front leg side mounting arm 31j, is rotated downward around the axis of the front leg side connecting pin 43, and the lower end portion is on the rear leg side. When it is connected to the connecting arm 40b by the rear leg side connecting pin 44, it is in a used state, and the relative angle A formed by the front leg 31 and the rear leg 35 is maintained.

When transporting such a pile driver 11, work-related equipment such as a leader and a gantry 24 are removed from the upper swivel body 14, and the pile driver 11 is separately transported using a large low-floor trailer and assembled on site. I am using it.

Here, with reference to FIGS. 5 to 7, a procedure for mounting the gantry 24 on the upper swing body 14 will be described as an example in which the method of assembling the construction machine of the present invention is applied to a pile driver. FIG. 5 shows a gantry 24 in a transport state. In the gantry 24, the front legs 31 and the rear legs 35 are connected by the rear leg suspension link 37, and the front legs 31 are supported by the pedestal 48. The rear legs 35 are supported by the transport jig 49 with the support pins 50, and are mounted on the loading platform of the low-floor trailer in a stable posture of lowering forward.

First, the suspension wire 38 is attached to the suspension portion 31g, and the beta pin 51 is removed and the support pin 50 is pulled out from the transport jig 49 in a state where the crane is operated to apply tension to the suspension wire 38. Next, the gantry 24 is lifted in a state of being inclined forward and downward, and is moved above the upper swivel body 14. At this time, the rear leg side connecting pin 44 comes into contact with the lower end of the rear leg side pin insertion hole 37d to prevent the rear leg 35 from opening. Subsequently, after aligning the lower end of the front leg 31 directly above the front bracket 29 of the upper swing body 14, the crane is operated in the winding direction to lower the gantry 24, and the rotation pin of the front bracket 29 and the front leg 31 is lowered. The rotating pin 30 is inserted in a state where the insertion holes 29a and 31d are matched. As a result, the front leg 31 is rotatably connected to the front side of the upper swivel body 14.

On the other hand, the lifted gantry 24 is affected by the backlash and the like of each movable part, and as shown in FIG. 6, the crane is operated in the winding direction to move the upper end portion of the rear bracket 33 to the rear leg 35. When the crane is inserted into the lower end portion of the crane, the rotation pin insertion holes 33a and 40a may not match each other, and the inserted rotation pin 34 may be caught in the middle. Therefore, the lever block 39 is used to align the rotation pin insertion holes 33a and 40a.

The hook 39d on the upper part of the main body 39a is locked to the shackle 52 attached to the locking hole 31m of the front leg side mounting arm 31j. Next, the hook 39e at the tip of the chain 39c is locked to the shackle 53 attached to the locking hole 40e of the rear leg side mounting arm 40c. Subsequently, when the lever 39b is rotated to wind up the chain 39c, the rear leg 35 rotates upward around the support shaft 32 due to the tension of the chain 39c, and the rear leg side connecting pin 44 inserts the rear leg side pin. The elongated hole of the hole 37d is moved upward. From this state, the hoisting and lowering by the operation of the crane and the hoisting and lowering by the operation of the lever block 39 are appropriately combined, and the undulating angle of the front leg 31 and the relative angle A formed by the front leg 31 and the rear leg 35. And, after matching the rotating pin insertion holes 33a and 40a, the rotating pin 34 is inserted. As a result, the rear legs 35 are rotatably connected to the rear side of the upper swing body 14. Finally, the lever block 39 and the shackles 52 and 53 are removed, and the rear leg hanging link 37 is stored on the rear surface of the front leg 31 to complete the mounting of the gantry 24.

As described above, since the rear leg side pin insertion hole 37d provided in the rear leg suspension link 37 is formed in a long hole in which the relative angle A formed by the front leg 31 and the rear leg 35 can be adjusted, the gantry 24 is formed. Is attached to the upper swing body 14, the rotation operation of the front leg 31 previously attached and the relative rotation operation of the rear leg 35 with respect to the front leg 31 are combined, and the degree of freedom in the movement direction of the rear leg 35 is high. The gantry 24 can be easily mounted by facilitating the alignment of the rotation pin insertion holes 33a and 40a between the rear leg 35 and the upper swing body 14. Further, since the front leg side mounting arm 31j and the rear leg side mounting arm 40c for mounting the lever block 39 are provided on the rear surface of the front leg 31 and the front surface of the rear leg 35, respectively, the gantry 24 is provided by using the lever block 39. Can be installed easily and quickly with little effort and operation.

The present invention is not limited to the above-mentioned embodiment, and the hind leg suspension link may have a shape having strength and rigidity that can safely transport the gantry and attach / detach it to / from the upper swing body. The position and shape of the elongated hole are also arbitrary, and for example, the front leg side pin insertion hole may be formed in the elongated hole. In addition, although a lever block is used for the position adjustment jig, it is not limited to this, and for example, an electric winch or a hydraulic winch can be used, and the chain has strength that does not hinder the lifting of the hind legs. Then, it may be composed of a resin rope, a metal wire rope, or the like. Further, the hook of the lever block can be directly locked to each mounting arm without using a shackle. Further, in the above-mentioned embodiment, a pile driver is exemplified as a construction machine, but it can be applied to various construction machines such as an earth drill and a crane in which a gantry is mounted at the rear of the upper swing body.

11 ... pile driving machine, 12 ... lower traveling body, 12a ... crawler, 13 ... swivel bearing, 14 ... upper swivel body, 14a ... floor frame, 15 ... front jack, 16 ... leader bracket, 17 ... driver's cab, 18 ... engine Room, 19 ... Inspection door, 20 ... House elevating ladder, 21 ... Stairs, 22 ... Rear jack, 23 ... Out trigger box, 24 ... Gantry, 25 ... Undulating rope, 26 ... Guide sheave, 27 ... Middle sheave block, 28 ... Gantry Sheave block, 29 ... front bracket, 29a ... rotating pin insertion hole, 30 ... rotating pin, 31 ... front leg, 31a ... main body member, 31b ... upper member, 31c ... lower member, 31d ... rotating pin insertion hole, 31e ... Gantry elevating ladder, 31f ... Fixed part, 31g ... Suspended part, 31h ... Cylinder mounting part, 31i ... Front leg side connecting arm, 31j ... Front leg side mounting arm, 31k ... Front leg side pin insertion hole, 31m ... Locking hole, 32 ... Support shaft, 33 ... Rear bracket, 33a ... Rotating pin insertion hole, 34 ... Rotating pin, 35 ... Rear leg, 36 ... Gantry undulating cylinder, 37 ... Rear leg hanging link, 37a, 37b ... Bifurcated part , 37c ... front leg side pin insertion hole, 37d ... rear leg side pin insertion hole, 38 ... hanging wire, 39 ... lever block, 39a ... main body, 39b ... lever, 39c ... chain, 39d, 39e ... hook, 40 ... lower rear Leg, 40a ... Rotating pin insertion hole, 40b ... Rear leg side connecting arm, 40c ... Rear leg side mounting arm, 40d ... Rear leg side pin insertion hole, 40e ... Locking hole, 41 ... Upper rear leg, 42 ... Intermediate Connecting member, 43 ... Front leg side connecting pin, 44 ... Rear leg side connecting pin, 45 ... Lower fixing pin, 46 ... Upper fixing pin, 47 ... Beta pin, 48 ... Pedestal, 49 ... Transport jig, 50 ... Support pin, 51 ... beta pin, 52, 53 ... shackle

Claims (3)

A pair of left and right front legs rotatably and detachably mounted on the front side of the upper swivel body at the lower end, and a rotatably mounted upper end on the upper end portion of the front leg, and the lower end of the upper swivel body. In a construction machine in which a gantry provided with a pair of left and right rear legs rotatably and detachably mounted on the rear side is detachably provided on the upper swing body, the gantry is provided with an upper end portion on the rear surface of the front legs. The relative angle between the front leg and the rear leg is set in advance by being connected to the front leg side connecting arm and the lower end portion connected to the rear leg side connecting arm provided on the front surface of the rear leg. The hind leg hanging link has a hind leg hanging link that holds the relative angle, and the hind leg hanging link is provided at the overlapping portion of the front leg side connecting arm and the hind leg hanging link, respectively, while holding the relative angle. By inserting the front leg side connecting pin into the provided front leg side pin insertion hole, the upper end portion of the rear leg hanging link is connected to the front leg via the front leg side connecting pin, and is connected to the rear leg side connecting arm. By inserting the rear leg side connecting pin into the rear leg side pin insertion holes provided in the overlapping portions with the rear leg hanging link, the lower end portion of the rear leg hanging link connects the rear leg side connecting pin. An elongated hole that is connected to the rear leg via the front leg and at least one of the front leg side pin insertion hole and the rear leg side pin insertion hole can adjust the relative angle when the gantry is attached to the upper swing body. A construction machine characterized by being formed in. A mounting arm to which a position adjusting jig for moving the front leg side connecting pin or the rear leg side connecting pin to move along the elongated hole is provided on the rear surface of the front leg and the front surface of the rear leg, respectively. The construction machine according to claim 1, wherein the construction machine is characterized in that. A pair of left and right front legs rotatably and detachably attached to the front side of the upper swing body at the lower end, and a rotatably mounted upper end to the upper end portion of the front leg, and the lower end of the upper swing body. In the method of assembling a construction machine in which a gantry having a pair of left and right rear legs rotatably and detachably mounted on the rear side is provided on the upper swing body so as to be detachable, the upper end of the gantry is the front leg. The relative angle between the front leg and the rear leg is formed by being connected to the front leg side connecting arm provided on the rear surface and connecting the lower end portion to the rear leg side connecting arm provided on the front surface of the rear leg. Has a hind leg hanging link that holds the body at a preset angle, and the hind leg hanging link is a superposition of the front leg side connecting arm and the hind leg hanging link while holding the relative angle. By inserting the front leg side connecting pin into the front leg side pin insertion hole provided in each portion, the upper end portion of the rear leg suspension link is connected to the front leg via the front leg side connecting pin, and the rear leg side is connected to the front leg. By inserting the rear leg side connecting pin into the rear leg side pin insertion holes provided in the overlapping portions of the connecting arm and the rear leg hanging link, the lower end portion of the rear leg hanging link becomes the rear leg side. Connected to the rear leg via a connecting pin, at least one of the front leg side pin insertion hole and the rear leg side pin insertion hole can adjust the relative angle when the gantry is attached to the upper swing body. The gantry is formed in a long hole, and when the gantry is attached to the upper swing body, the gantry is lifted while maintaining the relative angle, the front leg is connected to the upper swing body, and the front leg On the other hand, a method for assembling a construction machine, characterized in that a step of lifting the hind legs and adjusting the relative angle and a step of connecting the hind legs to the upper swing body are performed in order.

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