JP2011047138A - Construction machine and method of lifting construction machine body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique for safely lifting up and down a construction machine without preparing a long tool or providing a sling or the like to a construction machine itself by welding or the like. <P>SOLUTION: This construction machine includes a construction machine body 3 having a lower structure 15, an upper structure 25, and a main boom 7 attached to the upper structure 25 so as to be raised and lowered. A working attachment 11 is attachable to/detachable from the front end 7d of the main boom 7. First and second pin insertion holes 7a, 7b allowing connection pins 17a, 17b for connecting the working attachment 11 to be inserted therein are formed at the front end 7d of the main boom 7. When the main boom 7 is raised so that the front end 7d of the main boom 7 is positioned at the rearmost, the center of the first pin insertion hole 7a in the longitudinal direction and the center of gravity G1 of the construction machine body 3 in the longitudinal direction are generally aligned with each other. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention comprises a construction machine main body having a lower traveling body, an upper turning body, and a boom, and a construction machine capable of detaching a work attachment for performing dismantling work, excavation work, and the like on the tip of the boom, and The present invention relates to a method for suspending the construction machine body.

  Conventionally, it has been known to attach large crushers, hydraulic crushers, etc. to dismantle concrete structures, etc., and to attach buckets, etc., to construction machine arms, etc., for excavation work. Yes. Then, when dismantling high-rise buildings or excavating underground, an ultra-long attachment consisting of multiple booms and arms, hydraulic crushers, buckets, etc. is attached to the tip of the main boom of a large construction machine. It is also installed to dismantle high places and perform deep excavation.

  However, when a work space sufficient to install a large construction machine cannot be secured for a long time during work in an urban area or the like, it is difficult to use a large construction machine with an ultralong attachment. For this reason, using a crane or the like, lift the construction machine with a large crusher etc. on the roof of the building to be demolished, or suspend the construction machine with a bucket etc. suspended in a vertical shaft surrounded by a retaining wall. Has been done.

  As shown in FIG. 11 (a), the construction machine is suspended by passing two suspension wires 137 and 137 in the width direction below the left and right crawler frames 115b of the construction machine 101. A method of hanging the construction machine 101 at four points before and after the crawler frames 115b and 115b is generally used.

  Further, for example, in Patent Document 1, a hook member for hanging an airframe is attached to a pair of bracket plates for pivoting an arm cylinder provided on a boom, and the hook for hanging the boom in a posture in which the boom is raised. The thing which lifted the construction machine with the wire cable through the member is disclosed.

  Further, Patent Document 2 uses a lifting pin attached to a pin hole of a bracket on a side surface of a boom to which one end of a boom cylinder is pinned, and a lifting tool provided at a rear part (upper part of a counterweight). A construction machine that suspends four points is disclosed.

  There is also known a method of suspending a construction machine at three points by a hanging tool welded to the back of the boom and a hanging tool provided on the left and right sides of the earth discharging plate.

JP-A-6-330538 JP-A-6-257179 (see in particular FIG. 4)

  However, the above four suspension methods have the following problems. That is, in the hanging method shown in FIG. 11, two hanging wires 137 and 137 whose both ends are hung on a hanging hook (not shown) such as a crane form a quadrangular pyramid with the lower end of the crawler frame 115b as the bottom (hanging). In order to avoid interference between the suspension wires 137, 137 and the upper swing body 125 by moving the wires 137, 137 closer to the upper swing body 125), as shown in FIG. It is necessary to prepare a special jig 127 longer than the width of the construction machine 101 as a width stopper for the suspension wires 137 and 137, and there is a problem that the production and transportation of the jig 127 are complicated.

  In the method described in Patent Document 1, the center of gravity of the construction machine in the front-rear direction often does not come directly below the hook member for hanging the aircraft, and the construction machine is lifted up in a tilted state. . As described above, if the construction machine is lifted in a tilted state, the construction machine may move in the width direction at the time of earth cutting, which causes a problem in safely lifting.

  Furthermore, in the method described in Patent Document 2, in order to secure the strength that can withstand the lifting of the construction machine, the structure of the counterweight and the upper swing structure can be changed, or the counterweight can be attached so that the lifting tool can be attached. There is a problem that the shape of the image must be changed. In addition, this method cannot be applied to the suspension work with the counterweight removed in order to reduce the suspension weight of the construction machine itself, and there is a problem that another means must be taken.

  Further, in the method of suspending the construction machine at three points by the lifting tool welded to the rear surface of the boom and the lifting tools provided on the left and right sides of the earth discharging plate as described above, the lifting tool is added to the boom by welding. There is a risk that the strength of the boom will decrease (a crack will occur due to stress concentration). In addition, since construction machines travel on crushed concrete shells and the like, there is a problem in that the suspension provided on a member located at a low position, such as a soil evacuation board, is likely to break during traveling. is there.

  The present invention has been made in view of such points, and an object of the present invention is to provide a long jig in a construction machine including a construction machine main body having a lower traveling body, an upper turning body, a boom, and the like. It is an object to provide a technique for safely lifting and hanging a construction machine without preparing a lifting tool or the like on the construction machine itself by welding or the like.

  A first aspect of the present invention is a lower traveling body, an upper revolving body mounted on the lower traveling body so as to be able to swivel from a predetermined state, and attached to the upper revolving body in the predetermined state so as to be undulated in the front-rear direction. A construction machine main body having a main boom, and a work attachment removable from the construction machine main body. A construction machine in which at least two pin insertion holes are formed so as to be arranged in the front-rear direction when viewed from the side, and the work attachment is attached to the main boom by inserting a connection pin through the pin insertion hole. The center of any one of the at least two pin insertion holes is the weight in the front-rear direction of the construction machine body as viewed from the side. Hanging position located vertically above the position and is configured to be position setting.

  According to the first invention, the position of the center of any one pin insertion hole formed at the tip of the main boom is set to the hanging position that is located vertically above the center of gravity in the front-rear direction of the construction machine body. Since it is configured to be possible, the suspension fulcrum and the center of gravity position in the front-rear direction of the construction machine main body can be substantially matched.

  Further, if a hanging tool for engaging a hanging wire hung on a hanging hook such as a crane is attached to, for example, a connecting pin for connecting a work attachment inserted through a pin insertion hole, a long jig is attached. The construction machine can be lifted or hung through the lifting tool without preparing the tool or providing the lifting tool or the like on the construction machine itself by welding or the like.

  Thus, even when the construction machine is lifted (suspended) via a lifting tool attached to the connecting pin, the suspension fulcrum and the position of the center of gravity of the construction machine main body in the front-rear direction substantially coincide with each other. Can be suspended substantially horizontally.

  Furthermore, unlike conventional ones, it is possible to suspend a construction machine (construction machine main body) from which the work attachment has been removed, so the suspension load is reduced, safety is improved, and a large crane is not required. Therefore, the economy is also improved.

  As described above, it is possible to safely suspend the construction machine without preparing a long jig or providing a lifting tool or the like on the construction machine itself by welding or the like.

  In the second aspect of the invention, in addition to the first aspect of the invention, when the main boom tilts most backward, the center of any one of the pin insertion holes is set at the suspension position. Yes.

  According to the second invention, when the main boom is erected so that the tip end portion of the main boom is located at the rearmost position, the center of any one of the pin insertion holes is positioned at the hanging position. Therefore, the suspension fulcrum and the position of the center of gravity in the front-rear direction of the construction machine main body can be easily made substantially coincident.

  According to a third aspect of the present invention, the construction machine body further includes a detachable counterweight at a rear portion of the upper swing body, and when the counterweight is mounted on the upper swing body, the at least two places are provided. Among the pin insertion holes, the center of the first pin insertion hole located on the rear side is set to be located at the suspension position, and when the counterweight is not mounted on the upper swing body, at least the above Of the two pin insertion holes, the center of the second pin insertion hole located in front of the first pin insertion hole is set to be located at the suspension position.

  According to the third invention, it is possible not only to suspend the construction machine with the work attachment removed, but also to suspend the construction machine with the counterweight removed. It is further reduced and the safety can be surely improved.

  According to a fourth aspect of the present invention, there is provided a detecting means for detecting that the center position of each pin insertion hole substantially coincides with the position of the center of gravity in the front-rear direction of the construction machine body, and a notification for notifying the passenger of the detection result by the detecting means. And a means.

  According to the fourth invention, when the position of the center of at least one pin insertion hole among the pin insertion holes comes to a position (hanging position) vertically above the center of gravity position in the front-rear direction of the construction machine main body, the detecting means However, while detecting that the center position of the pin insertion hole substantially coincides with the position of the center of gravity in the front-rear direction of the construction machine body, the notifying means notifies the occupant of the detection result. Can be fixed.

  In the present invention, “the position of the center of the pin insertion hole in the front-rear direction and the position of the center of gravity in the front-rear direction of the construction machine body substantially coincide” means that the construction machine main body is the suspension fulcrum as the center of the pin insertion hole. When suspended, the position of the center of the pin insertion hole in the front-rear direction and the position of the center of gravity in the front-rear direction of the construction machine body coincide or approach so that the inclination in the front-rear direction of the construction machine falls within 0 to 5 degrees. Means that

  According to a fifth aspect of the present invention, there is provided a lower traveling body, an upper revolving body that is pivotably mounted on the lower traveling body, a boom that is undulated with respect to the upper revolving body, and a hoisting the boom. A boom cylinder, and a suspension method for a construction machine body in which a pin insertion hole into which a connection pin for connecting a work attachment to the tip of the boom can be inserted is formed in the pin insertion hole. The boom is raised and lowered so that the lifting tool is attached to both ends of the inserted connecting pin, the position of the center of the pin insertion hole in the front-rear direction, and the position of the center of gravity of the construction machine body in the front-rear direction. And a step of lifting the construction machine main body through the lifting tool.

  According to the fifth invention, the lifting tool is attached to both ends of the connecting pin inserted through the pin insertion hole, and the position of the center of the pin insertion hole in the front-rear direction and the position of the center of gravity in the front-rear direction of the construction machine main body are Suspension tool attached to the connecting pin with a simple work of raising and lowering the boom so that it almost matches, without preparing a long jig or installing a suspension tool etc. on the construction machine itself by welding etc. It is possible to lift the construction machine main body substantially horizontally via the.

  According to a sixth aspect of the present invention, the method according to the fifth aspect further includes the step of preparing an upper revolving body having a counterweight that can be attached to and detached from a rear portion, and removing the counterweight.

  According to the sixth invention, the construction machine main body can be suspended even with the counterweight removed, so that the suspension load is reduced and the safety can be further improved.

  As described above, according to the construction machine according to the present invention, the suspension fulcrum and the position of the center of gravity in the front-rear direction of the construction machine main body can be easily substantially matched using the pin insertion hole, It is possible to avoid the construction machine from being largely inclined when suspended.

  In addition, it is possible to easily suspend the construction machine by using the pin insertion holes without preparing a long jig or providing a lifting tool or the like on the construction machine itself.

It is a side view which shows the construction machine main body which concerns on this invention. It is a side view which shows the hydraulic excavator provided with the construction machine main body. It is a figure which shows the hanging posture of the construction machine main body with which the counterweight was attached. It is a figure which shows the hanging attitude | position of the construction machine main body from which the counterweight was removed. It is a figure which shows a hanging tool, the figure (a) is a side view, and the figure (b) is a front view. It is a figure explaining the hanging method of the construction machine main body with which the counterweight was attached. It is a figure explaining the hanging method of the construction machine main body from which the counterweight was removed. It is a side view which shows the construction machine which concerns on other embodiment. It is a side view which shows the construction machine which concerns on other embodiment. It is a schematic side view which shows the principal part of the construction machine which concerns on other embodiment. It is a figure explaining the hanging method of the conventional construction machine, The figure (a) is a side view, The figure (b) is a front view.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a side view showing a construction machine main body according to the present invention. The construction machine main body 3 constitutes a part of the hydraulic excavator (construction machine) 1 and is mounted on the lower traveling body 15 to which the crawlers 15a and 15a are attached and the upper portion of the lower traveling body 15 so as to be freely rotatable. An excavator body 5 having an upper revolving body 25 provided with a cab 35 for a driver's cab, and a main boom disposed on the right side of the cab 35 and attached to the upper revolving body 25 so as to be raised and lowered. 7 and boom cylinders 9 and 9 for raising and lowering the main boom 7 provided on both the left and right sides of the main boom 7.

  In addition, the upper turning body 25 is normally held in a predetermined state (reference state) shown in the figure in which the undulation direction of the main boom 7 and the traveling direction of the lower traveling body 15 are substantially coincident. Hereinafter, the upper-part turning body 25 is assumed to be held in this predetermined state unless otherwise specified.

As shown in FIG. 2, the construction machine main body 3 includes a sub boom 21, an arm 31 that is rotatably attached to a distal end portion of the sub boom 21 via a connection pin 21 a, and a connection pin attached to the distal end portion of the arm 31. The work attachment 11 having a capacity of 0.45 m class ³ bucket 41 that is rotatably attached via 31a is detachably attached to the tip 7d of the main boom 7 so as to constitute the hydraulic excavator 1. It has become. That is, the boom of the hydraulic excavator 1 of this embodiment is configured by connecting the main boom 7 and the sub boom 21 and fixing them together.

  This work attachment 11 is driven by the sub boom 21 being driven by the extension and reduction of the boom cylinder 9, the arm 31 by the extension and reduction of the arm cylinder 19, and the bucket 41 by the extension and reduction of the bucket cylinder 29. Excavation of mountains and loading of excavated earth and sand are carried out.

  The upper turning body 25 has a detachable counterweight 45 at its rear part. The counterweight 45 is substantially U-shaped in plan view, and is attached to the upper swing body 25 by bolting at a total of four locations, two on the left and two on the left. For this reason, the counterweight 45 covers not only the rear surface of the upper swing body 25 but also both side surfaces behind the cab 35 when attached to the rear portion of the upper swing body 25. The engine room (see FIG. 7) provided at the rear part is surrounded from three directions.

  Further, the counterweight 45 has a large weight (about 4 tons). Therefore, the hydraulic excavator 1 can operate even if the rear end of the upper swing body 25 does not extend backward as in the conventional excavator 1. Can be balanced. As a result, the excavator 1 is a relatively large construction machine having a weight of about 13.6 tons (with the counterweight 45 attached), but the amount of the counterweight 45 protruding beyond the crawler 15a when turning. Is a so-called rear ultra-small turning hydraulic excavator that does not exceed 10% of the crawler width.

  The main boom 7 is connected to the upper swing body 25 via a boom foot pin 7c so as to be raised and lowered, and the boom foot pin is associated with expansion and contraction of the boom cylinders 9 and 9 provided on the left and right. The undulation operation (raising and lowering) is performed around 7c. In this way, the main boom 7 is more specifically a part of the tip 7d so that the main boom 7 is tilted more backward than the conventional one when the boom cylinders 9 and 9 are raised most. Is configured to be located behind the rear end of the cab 35.

  Two pin insertion holes 7a and 7b extending in the vehicle width direction through which the connection pins 17a and 17b for connecting the work attachment 11 can be inserted are formed at the distal end portion 7d of the main boom 7 when viewed from the side. ing. These two pin insertion holes 7a and 7b are formed to be aligned in the front-rear direction (the first pin insertion hole 7a is the rear side and the second pin insertion hole 7b is the front side) when the main boom 7 is raised. .

  As shown in FIG. 3, the first pin insertion hole (rear pin insertion hole) 7 a is formed by the boom cylinders 9 and 9 so that the distal end portion 7 d of the main boom 7 is located at the rearmost position. In the upright state, the center position of the first pin insertion hole 7a in the front-rear direction and the center-of-gravity position G1 in the front-rear direction of the construction machine main body 3 to which the counterweight 45 is attached are substantially matched. Yes.

  More specifically, in the present invention, the rear end of the upper swing body 25 does not extend backward, in other words, the center of gravity position G1 of the construction machine main body 3 in the front-rear direction is on the front side of the conventional one, and the main boom 7 is configured so that the front end portion 7d of the main boom 7 is positioned rearward of the rear end of the cab 35, and the front end portion 7d of the main boom 7 positioned rearward is the front and rear of the construction machine main body 3. Paying attention to the proximity to the center of gravity position G1 in the direction, the center position of the first pin insertion hole 7a is located at the suspended position located above the center of gravity position G1 in the front-rear direction when viewed from the side. The first pin insertion hole 7a is formed in the distal end portion 7d of the main boom 7 so as to substantially coincide with the center of gravity position G1 in the vertical direction. As a result, when the construction machine main body 3 is lifted through the connecting pin 17a inserted into the first pin insertion hole 7a, the suspension fulcrum and the center of gravity position G1 in the front-rear direction of the construction machine main body 3 substantially coincide with each other. The construction machine body 3 is lifted substantially horizontally.

  On the other hand, as shown in FIG. 4, the second pin insertion hole (front pin insertion hole) 7b allows the main boom 7 to be moved by the boom cylinders 9 and 9 so that the distal end portion 7d of the main boom 7 is located at the rearmost position. In the upright state, the center position of the second pin insertion hole 7b in the front-rear direction and the center-of-gravity position G2 in the front-rear direction of the construction machine body 3 from which the counterweight 45 has been removed are formed so as to substantially coincide with each other. Has been.

  More specifically, in the present invention, when the counterweight 45 is removed, the center-of-gravity position G2 of the construction machine body 3 in the front-rear direction is more forward than the center-of-gravity position G1 of the construction machine body 3 to which the counterweight 45 is attached. The center position of the second pin insertion hole 7b is located at the suspended position that is located vertically above the center of gravity position G2 in the front-rear direction when viewed from the side, and the center of gravity position G2 A second pin insertion hole 7 b is formed in the tip end portion 7 d of the main boom 7 so as to substantially coincide with the vertical direction. As a result, when the construction machine main body 3 is lifted through the connecting pin 17b inserted into the second pin insertion hole 7b, the suspension fulcrum and the center of gravity position G2 in the front-rear direction of the construction machine main body 3 are substantially coincident. As a result, the construction machine body 3 is lifted substantially horizontally, and the hanging weight is greatly reduced.

  Suspension tools 27 and 27 for connecting a connecting pin 17a inserted through the pin insertion hole 7a and a suspension wire 37 hung at the center of a suspension hook (not shown) such as a crane are connected to the pin insertion hole 7a. It is adapted to be attached to both end portions of the inserted connecting pin 17a, and as shown in FIG. 5, it has suspender main bodies 27a, 27a and a removal preventing member 27b. In addition, since the suspension tools 27 and 27 attached to the connection pin 17b are also the same structure, description is abbreviate | omitted. Further, in FIG. 5, the boom cylinders 9 are not shown for easy understanding of the drawing.

  The suspension body 27a has a shape (substantially darling) in which the outer periphery is connected to two large and small circles by a tangent in a side view, and two large and small through-holes extending in the vehicle width direction are formed side by side. Has been. Then, as shown in FIG. 5A, the connecting pin 17a is inserted into the lower large through hole, while the shackle 47 bolt for connecting the suspension wire 37 to the upper small through hole. Is to be inserted. The suspension main body 27a is prevented from coming out of the connection pin 17a by attaching the drop prevention member 27b to the end of the connection pin 17a. The hanging tool body 27a and the removal prevention member 27b are formed in a size that can be stored in a tool storage box (not shown) provided in the driver's seat or the vehicle body, and are always provided in the construction machine body 3. It has been.

−How to suspend the construction machine itself−
Next, a method for suspending the construction machine main body 3 will be described.

  When suspending the construction machine main body 3 to which the counterweight 45 is attached, first, as shown in FIG. 6A, the suspension tools 27 and 27 are attached in a state where an unillustrated worker stands on the ground. The main boom 7 is lowered by reducing the boom cylinders 9 and 9. In FIG. 6A, the main boom 7 is lowered to the lowest position, but may be a higher position as long as the worker can work while standing on the ground. Further, in the case where the suspension work is performed from the state in which the work attachment 11 is attached, the lifting tools 27 and 27 may be attached when removing the work attachment 11.

  Then, as shown in FIG. 6 (b), the hanger 27, 27 is attached to both ends of the connecting pin 17a inserted through the first pin insertion hole 7a.

  Next, as shown in FIG. 6 (c), both ends of the suspension wire 37 with the center portion hung on the suspension hook of the crane are connected to the left and right suspension tools 27, 27 via shackles 47, 47.

  When the connection between the suspension wire 37 and the suspension tools 27 and 27 is completed, as shown in FIG. 6D, the main boom is moved by the boom cylinders 9 and 9 so that the distal end portion 7d of the main boom 7 is located at the rearmost position. 7, the position of the center of the first pin insertion hole 7a in the front-rear direction and the center-of-gravity position G1 in the front-rear direction of the construction machine main body 3 are substantially matched.

  After the preparation for suspending the construction machine main body 3 is completed as described above, the construction machine main body 3 is lifted by the crane via the lifting tools 27 and 27.

  On the other hand, when suspending the construction machine main body 3 from which the counterweight 45 has been removed, first, as shown in FIG. 7 (a), the counterweight 45 is removed from the upper swing body 25 using a crane (not shown), The boom cylinders 9 and 9 are reduced to lower the main boom 7 so that the lifting tools 27 and 27 can be attached while the worker is standing on the ground.

  Then, as shown in FIG. 7 (b), the hanger 27, 27 is attached to both ends of the connecting pin 17b inserted into the second pin insertion hole 7b.

  Next, as shown in FIG. 7 (c), both ends of the suspension wire 37 with the center portion hung on the suspension hook of the crane are connected to the left and right suspension tools 27, 27 via shackles 47, 47.

  When the connection between the suspension wire 37 and the suspension tools 27 and 27 is completed, as shown in FIG. 7 (d), the main boom is moved by the boom cylinders 9 and 9 so that the distal end portion 7d of the main boom 7 is located at the rearmost position. 7, the center position of the second pin insertion hole 7b in the front-rear direction and the center-of-gravity position G2 in the front-rear direction of the construction machine body 3 from which the counterweight 45 has been removed are substantially matched.

  After completing the preparation for suspending the construction machine main body 3 as described above, the construction machine main body 3 from which the counterweight 45 has been removed is lifted by the crane via the lifting tools 27 and 27.

-Effect-
According to this embodiment, the construction machine main body 3 is the first in the front-rear direction in a state where the main boom 7 is raised by the boom cylinders 9, 9 so that the distal end portion 7d of the main boom 7 is located at the rearmost position. Since the center position of the pin insertion hole 7a and the gravity center position G1 in the front-rear direction of the construction machine main body 3 to which the counterweight 45 is attached are configured to substantially coincide with each other, the suspension fulcrum and the front and rear of the construction machine main body 3 are configured. The center-of-gravity position G1 in the direction can be easily made substantially coincident.

  Moreover, since the suspension tool 27 for connecting the suspension wire 37 hung on the suspension hook of a crane or the like is attached to the connection pin 17a inserted through the first pin insertion hole 7a, a long jig is prepared. The construction machine main body 3 can be lifted or suspended via the lifting tool 27 without providing a lifting tool or the like on the excavator 1 itself by welding or the like.

  Then, in a state where the main boom 7 is erected so that the distal end portion 7d of the main boom 7 is located at the rearmost position, the construction machine main body 3 is moved via the suspension tools 27 and 27 attached to the connecting pin 17a. Even when it is lifted, since the suspension fulcrum and the center of gravity position G1 in the front-rear direction of the construction machine main body 3 substantially coincide with each other, the construction machine main body 3 can be hung substantially horizontally.

  Further, unlike the conventional one, the hydraulic excavator 1 can be suspended with the work attachment 11 removed, so that the suspension load is reduced, safety is improved, and a large crane is not required. Also improves.

  As described above, it is possible to safely hang the construction machine main body 3 without preparing a long jig or providing a lifting tool or the like on the excavator 1 itself by welding or the like.

  Further, in the state where the main boom 7 is erected so that the distal end portion 7d of the main boom 7 is located at the rearmost position, the excavator 1 has a center weight of the second pin insertion hole 7b in the front-rear direction and a counterweight. Since the center of gravity position G2 in the front-rear direction of the construction machine main body 3 from which the 45 is removed is configured to substantially match, the suspension fulcrum and the construction machine main body 3 are not affected by whether the counterweight 45 is attached or detached. The center of gravity position G2 in the front-rear direction can be made substantially coincident.

  Furthermore, unlike the conventional one, the excavator 1 can be suspended not only with the work attachment 11 removed, but also with the counterweight 45 removed. Therefore, the suspension load can be further reduced and the safety can be reliably improved.

(Other embodiments)
The present invention is not limited to the embodiments, and can be implemented in various other forms without departing from the spirit or main features thereof.

  In the said embodiment, although the work attachment 11 which has the bucket 41 used as the construction machine used the hydraulic excavator 1 attached to the front-end | tip part 7d of the main boom 7, it is not restricted to this, For example, as shown in FIG. A dismantling machine in which the work attachment 11 having a large crusher is attached to the tip 7d of the main boom 7 may be used.

  Moreover, in the said embodiment, although the sub boom 21 fixed to the main boom 7 was used as a construction machine, it is not restricted to this, For example, as shown in FIG. 9, the connected sub boom 21 and the main boom 7 are used. However, a demolition machine using a separate boom configured to be bent at a connecting portion between the two may be used.

  Furthermore, in the said embodiment, in the state which raised the said main boom 7 with the boom cylinders 9 and 9 so that the front-end | tip part 7d of the main boom 7 may be located in the backmost part, it is the pin insertion hole 7a (7b) in the front-back direction. Although the center position and the center of gravity position G1 (G2) in the front-rear direction of the construction machine body 3 are configured to substantially coincide with each other, the present invention is not limited to this, and the front end portion 7d of the main boom 7 is located at the frontmost position. In a state, for example, with the main boom 7 standing upright, the center position of the pin insertion hole 7a (7b) in the front-rear direction and the center of gravity position G1 (G2) in the front-rear direction of the construction machine body 3 substantially coincide. You may comprise as follows.

  In this case, for example, as shown in FIG. 10, it is preferable to provide a sensor 50 (detection means) at the base end portion of the main boom 7. Then, it can be detected by this sensor 50 that the center position of the pin insertion hole 7a (7b) and the gravity center position G1 (G2) in the front-rear direction of the construction machine main body 3 substantially coincide. And if the result is alert | reported to a passenger | crew by the alerting | reporting means 51, such as a buzzer provided in the cab 35, a display apparatus, etc., the main boom 7 can be easily fixed to an appropriate suspension position.

  Moreover, in the said embodiment, although the construction machine main body 3 was lifted or suspended via the suspension tool 27, it is not restricted to this, For example, the suspension wire 37 is directly connected with connection pin 17a, 17b. The construction machine body 3 may be lifted or hung.

  In the type in which a pair of support pieces for connection is provided at the distal end portion 7d of the main boom 7 and the base end portion of the sub boom 21 is received and connected between the support pieces, the pin insertion holes 7a and 7b are respectively supported by One piece may be formed through each piece (four in total). On the contrary, in the type in which a pair of support pieces are provided at the base end portion of the sub boom 21 and the front end portion 7d of the main boom 7 is received and connected between the support pieces, the pin insertion holes 7a and 7b are provided at the front ends. Two pieces may be formed through the portion 7d.

  As described above, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

As described above, the present invention includes a construction machine main body having a lower traveling body , an upper turning body, and a boom, and a work attachment for performing dismantling work, excavation work, and the like can be attached to and detached from the tip of the boom. This is useful for a simple construction machine and a method for suspending the construction machine body.

1 Excavator (construction machine)
3 Construction machine body 7 Main boom 7a First pin insertion hole (rear pin insertion hole)
7b Second pin insertion hole (front pin insertion hole)
9 Boom cylinder 11 Work attachment 15 Lower traveling body 17a Connecting pin 25 Upper turning body 45 Counterweight G1 Center of gravity position G2 of the construction machine main body to which the counterweight is attached In the front-rear direction of the construction machine main body from which the counterweight has been removed Position of the center of gravity

Claims (6)

A lower traveling body,
On the lower traveling body, an upper revolving body mounted so as to be able to swivel from a predetermined state;
A main boom mounted in a undulating manner in the longitudinal direction with respect to the upper swing body in the predetermined state;
A construction machine body having
A work attachment removable from the construction machine body,
With
In the upper swing body in the predetermined state, at the tip end portion of the main boom that is erected, at least two pin insertion holes are formed in the front-rear direction when viewed from the side,
A construction machine in which the work attachment is attached to the main boom by inserting a connecting pin through the pin insertion hole,
Of the at least two pin insertion holes, the center of any one of the pin insertion holes is set at a hanging position that is located vertically above the center of gravity in the front-rear direction of the construction machine body when viewed from the side. Construction machines that are configured to be possible. The construction machine according to claim 1,
A construction machine in which the center of any one of the pin insertion holes is set at the suspension position when the main boom tilts most rearward. In the construction machine according to claim 1 or 2,
Furthermore, the construction machine body includes a detachable counterweight at the rear part of the upper swing body,
When the counterweight is mounted on the upper swing body, among the at least two pin insertion holes, the center of the first pin insertion hole located on the rear side is set at the suspension position. And
When the counterweight is not mounted on the upper swing body, the center of the second pin insertion hole located in front of the first pin insertion hole among the at least two pin insertion holes is the suspension. Construction machine set to be in position. In the construction machine as described in any one of Claims 1-3,
Detection means for detecting that the position of the center of each pin insertion hole substantially coincides with the position of the center of gravity in the front-rear direction of the construction machine body;
A construction machine, further comprising notification means for notifying a passenger of a detection result by the detection means. A lower traveling body, an upper revolving body that is pivotably mounted on the lower traveling body, a boom that is undulated with respect to the upper revolving body, and a boom cylinder for raising and lowering the boom. A construction machine main body suspension method in which a pin insertion hole is formed through which a connection pin for connecting a work attachment to the tip of the boom can be inserted,
Attaching a hanger to both ends of the connecting pin inserted through the pin insertion hole;
Raising and lowering the boom so that the position of the center of the pin insertion hole in the front-rear direction and the position of the center of gravity in the front-rear direction of the construction machine main body substantially coincide with each other;
Lifting the construction machine main body via the lifting tool, and a method for suspending the construction machine main body. In the hanging method of the construction machine main body according to claim 5,
Prepare the upper revolving body with a counterweight that can be attached and detached at the rear,
A method for suspending a construction machine body, further comprising the step of removing the counterweight.

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