JP3218760U - Attachment for hydraulic excavator - Google Patents

Abstract

An attachment for a hydraulic excavator that is suitable for safely and quickly lifting and transferring a large processing object such as a flexible container bag containing decontamination waste is provided.
Connection pins (22, 23) arranged in parallel with a predetermined interval are attached to a base (17), and first and second hands (11, 12) are pivotally supported to be swingable. The first holding body 25 of the first hand 11 is curved in a bow shape so as to bulge outward, and is arranged in parallel at a predetermined interval, and a plurality of arch members 30a, 30b, 30c constituting the horizontal lattice portion 29; These are formed by connecting a plurality of connecting members 31a and 31c that extend in a straight line and intersect the arch member in a lattice shape and that form a vertical lattice portion. The second hand 12 disposed to face the first hand 11 also has the same configuration as the first hand.
[Selection] Figure 2

Description

  The present invention relates to an attachment for a hydraulic excavator that is attached to the distal end side of an arm of a hydraulic excavator, and in particular, a large processing object such as a flexible container bag (hereinafter abbreviated as a flexible container bag) containing decontamination waste. It is related with the attachment for hydraulic excavators suitable for lifting and transferring.

  So far, decontamination work has been carried out as reconstruction and restoration work from the nuclear power plant accident caused by the Great East Japan Earthquake. Decontamination waste such as topsoil and vegetation removed by decontamination is stored in a flexible storage bag made of chemical fibers such as polyethylene, and is piled up in a temporary storage area in the work area. The total number exceeds several million as of June 2018. Since each flexible container bag has a weight of about 1 ton, heavy machinery such as a rough terrain crane has been used for stacking them. A suspension belt is attached to the upper part of the flexible container bag in an arch shape, and can be used when the flexible container bag is lifted and transferred.

  2. Description of the Related Art Conventionally, various types of hydraulic excavator attachments mounted on the distal end side of a hydraulic excavator arm have been developed in accordance with the shape and size of the object to be processed. For example, Patent Document 1 discloses an attachment for lifting and transferring a rock, and Patent Document 2 discloses an attachment for lifting and transferring a remaining material and a scrap. Discloses an attachment for lifting and transporting the accumulated wood.

JP-A-8-226128 JP 2013-245484 A JP 2007-153561 A

  The decontamination waste accommodated in the flexible container bag is sequentially placed on a truck, transported from a temporary storage site to an intermediate storage facility, and separated. When transporting flexible container bags containing decontaminated waste, it is extremely dangerous if the pollutants that are contained are scattered or leaked. Carefully consider heavy safety and carefully handle heavy machinery. Need to handle flexible containers.

  By the way, the flexible container bag containing the decontamination waste has already been used for a considerable period of time, and there is a possibility that the suspension belt of the flexible container bag and its base part are deteriorated or worn. Therefore, when lifting the flexible container bag using the suspension belt and transferring it to the truck bed, there is a risk that the suspension belt will break and the back body will fall and break, and the contents will be scattered or leaked to contaminate the surrounding environment. There is. In this regard, if an attempt is made to lift the back body using the attachment provided with the nail as shown in Patent Document 1 without using the suspension belt, the attachment nail will bite into the back body that has deteriorated over time. Because it is assumed that there is a risk of damaging the back body, it is difficult to adopt it at the work site where high safety is required.

  Since the total number of flexible container bags transferred to the intermediate storage facility exceeds several million, quick cargo handling (transfer) work is required.

  The object of the present invention is to solve the above-mentioned problems, and to lift and transfer a large processing object such as a flexible container bag containing decontaminated waste safely and quickly without scattering or leaking the stored article. An object of the present invention is to provide an attachment for a hydraulic excavator that is suitable for this purpose.

The hydraulic excavator attachment of the present invention is
A pair of connecting pins arranged in parallel with a predetermined interval is attached, and a base attached to the tip side of the arm of the excavator;
A first base end portion pivotally supported by one of the connecting pins and a first holding body integrally formed on the first base end portion and formed in a ladder shape or a lattice shape. Hands and
A second base end pivotally supported by the other connecting pin, and a second holding body formed integrally with the second base end and formed in a ladder shape or a lattice shape, A second hand disposed opposite the first hand;
Have
Each of the first holder and the second holder is
A plurality of arch members that curve in a bow so as to bulge outward, are arranged in parallel at a predetermined interval, and constitute a horizontal lattice portion;
A plurality of connecting members extending linearly and arranged in a direction intersecting the arch member, and constituting a vertical lattice portion;
Is formed by connecting them in a ladder shape or a lattice shape,
The first and second hands are:
From the open position where the first holding body and the second holding body are spaced apart from each other and spread outwardly with each of the connecting pins as a rotation center by hydraulic pressure, the tip of the first holding body and the second holding body It is characterized in that it can be freely opened and closed between the closed positions where the tips abut each other.

  The horizontal lattice portion may be configured by arranging three arch members having a curvature radius of 60 to 70 cm and curved in a bow shape in parallel at intervals of 45 to 55 cm.

  Moreover, you may make it the front-end | tip part of the said connection member protrude and extend from the said horizontal lattice part arrange | positioned at the front end side.

  According to the present invention, a processing object that cannot be scattered or leaked, such as a flexible container bag containing decontamination waste, can be lifted and transferred safely and quickly. That is, according to the present invention, the object to be treated can be lifted so as to be held from the bottom side, and even if the suspension belt of the flexible container back and the base portion thereof are worn or damaged, It can be lifted and transported safely without biting the nails. In addition, each of the first and second hands includes a holding body that is curved in a bow shape so that the horizontal lattice portion swells outward, corresponding to the bag shape of the flexible container bag that is the processing object. Since it is easy to hold the bag, the cargo handling operation can be performed quickly.

  In particular, the horizontal lattice portion forming the holding body of the first and second hands is configured by arranging three arch members curved in a bow shape having a curvature radius of 60 to 70 cm in parallel at intervals of 45 to 55 cm. You may make it do. By adopting such a configuration, it is possible to suitably lift a bag-like object to be processed having a height of about 1 m and a diameter of about 120 cm to 130 cm in a state in which a so-called tonback is fully filled. .

  Moreover, you may make it the front-end | tip part of the connection member which forms the holding body of a 1st and 2nd hand protrude and extend from the horizontal lattice part arrange | positioned at the front end side. Thereby, it becomes easy to insert the tip of the attachment according to the present invention into the gap between the processing objects arranged close to or in close proximity to each other, and the individual processing objects can be easily held.

It is a figure which shows the state which mounted | wore the hydraulic shovel with the attachment for hydraulic excavators which is one Example. It is a figure which expands and shows the attachment for hydraulic excavators shown in FIG. 1 from the front side. It is the figure which abbreviate | omitted and partially shown the attachment for hydraulic shovels shown in FIG. 2 from the bottom face side. It is the figure which abbreviate | omitted and showed the attachment for hydraulic excavators shown in FIG. 2 from the left side surface side. It is the figure which showed the attachment for hydraulic excavators in an open position from the front side. It is the figure which abbreviate | omitted and showed the attachment for hydraulic excavators shown in FIG. 5 from the bottom face side. It is the figure which showed the attachment for hydraulic excavators in a closed position from the front side. It is the figure which showed the state holding the flexible container back from the front side.

  EXAMPLES Hereinafter, although this invention is demonstrated concretely using an Example, this invention is not limited to these. In the present specification, for convenience of explanation, as shown in FIG. 1, the vertical direction is the vertical direction with the base end portion of each hand 11, 12 placed on the upper side and the distal end portion placed on the lower side. In some cases, the left-right direction is expressed as a horizontal direction, the direction in which each hand 11, 12 is closed is expressed as inward, and the direction in which each hand 11, 12 is opened is expressed as outward.

  FIG. 1 is a diagram illustrating a state in which a hydraulic excavator attachment 1 according to an embodiment is mounted on a hydraulic excavator 2. The hydraulic excavator 2 is a kind of heavy machinery that is generally used, and an upper swing body 5 is mounted on a crawler 3 via a swing device 4. The upper swing body 5 includes an operator cab 6, a power unit 7, and the like, and a hydraulic pump and a control valve are built in the power unit 7. Then, the multi-joint work device (front) including the boom 8 and the arm 9 that are rotatably attached to the upper swing body 5 can be freely operated by the hydraulic pressure supplied from the power unit 7. It is like that. A hydraulic excavator attachment 1 according to an embodiment of the present invention is detachably attached to the distal end side of the arm 9. The hydraulic cylinder as a hydraulic mechanism for controlling the opening and closing of the excavator attachment 1 is supplied with hydraulic pressure from the power unit 7 through a hydraulic circuit (not shown), so that the hands 11 and 12 can be freely opened at any opening degree. Can be controlled to open and close. A flexible container bag 40 containing decontaminated waste is stacked on the ground. A suspension belt 41 is attached to the upper part of each flexible container bag 40 in an arch shape.

  A bracket 15 is rotatably attached to the tip of the arm 9 via a front link 14 that is operated by a hydraulic cylinder 13. Near the upper side of the bracket 15, first and second mounting holes 18 and 19 are formed (see FIG. 2). At the tips of the arm 9 and the front link 14, an attachment coupler having first and second communication holes corresponding to the first and second mounting holes 18 and 19 is provided. By attaching the connection pins 20 and 21 to the communication hole and the first and second attachment holes 18 and 19, respectively, the bracket 15 is attached to the tip of the arm 9 so as to move up and down or turn freely. A base 17 is attached to the bracket 15 via a turning device 16, and the base 17 can be freely moved to an arbitrary position and angle.

  FIG. 2 is an enlarged view of the hydraulic excavator attachment 1 shown in FIG. 1 from the front side, and FIG. 3 is a diagram showing the hydraulic excavator attachment 1 shown in FIG. It is. FIG. 4 is a view in which the hydraulic shovel attachment 1 shown in FIG. 2 is partially omitted from the left side. As shown in the figure, the attachment 1 for a hydraulic excavator is attached with a pair of connecting pins 22 and 23 arranged in parallel at a predetermined interval, and a base 17 attached to the distal end side of the arm 9 of the hydraulic excavator 1; A first base end portion 24 pivotally supported by one connecting pin 22 and a first holding body 25 provided integrally with the first base end portion 24 and formed in a ladder shape or a lattice shape are provided. The first hand 11, the second base end portion 26 that is pivotally supported by the other connecting pin 23, and the second base end portion 26 that is provided integrally with the second base end portion 26 and formed in a ladder shape or a lattice shape. And a second hand 12 that is disposed to face the first hand 11. The first holding body 25 is curved in a bow shape so as to bulge outward, is arranged in parallel at a predetermined interval, and extends linearly with a plurality of arch members 30a, 30b, 30c constituting the horizontal lattice portion 29. It is formed by connecting a plurality of connecting members 31a, 31b, 31c, which are arranged in a direction intersecting the arch members 30a, 30b, 30c and constitute the vertical lattice portion 28, in a lattice shape. The second holding body 27 is curved in a bow shape so as to bulge outward, and is arranged in parallel at a predetermined interval, and a plurality of arch members 30a ′, 30b ′, 30c ′ constituting the horizontal lattice portion 29 ′, A plurality of connecting members 31a ′, 31b ′, and 31c ′ that extend linearly and are arranged in a direction intersecting the arch members 30a ′, 30b ′, and 30c ′ and constitute the vertical lattice portion 28 ′. It is formed by connecting in a shape. The first hand 11 and the second hand 11 are hydraulically moved from the open position where the first holding body 25 and the second holding body 27 are separated from each other and spread outwardly with the connection pins 22 and 23 as rotation centers. The first holding body 25 and the second holding body 27 rotate so as to be openable and closable up to a closed position where the front ends of the second holding body 27 abut each other. Next, each part or member will be described in detail.

  The base 17 is attached to the distal end side of the arm 9 of the hydraulic excavator 2, more specifically, to a bracket 15 attached to the distal end of the arm 9 via a turning device 16. 9 freely rotates at an arbitrary angle with the longitudinal direction of 9 as a rotation axis. The base 17 is arranged so as to sandwich a pair of connecting pins 22 and 23 arranged in parallel at a predetermined interval, and the respective end portions of the connecting pins 22 and 23 are fixed. And a pair of base plates 32 and 33. The interval at which the connecting pins 22 and 23 are arranged is set wider than the width dimension of the flexible container bag 40 that is the object to be processed.

  The first hand 11 includes a first base end portion 24 that is pivotally supported by one connecting pin 22 and a first holding body 25 that is provided integrally with the first base end portion 24 and configured in a lattice shape. With. The second hand 12 includes a second base end portion 26 that is pivotally supported by the other connecting pin 23 and a second holding body 27 that is provided integrally with the second base end portion 26 and has a lattice shape. With. In the present embodiment, the first hand 11 and the second hand 12 have the same shape, and are arranged to face each other as shown in the figure. Hereinafter, the configuration of the first hand 11 will be described, and parts or members of the second hand 12 that are common to the first hand 11 may be denoted by the same reference numerals with “′” symbols, and description thereof may be omitted.

  The first base end portion 24 of the first hand 11 is composed of a pair of plates 34 and 35 arranged in parallel to each other (see FIG. 3), and a first connecting pin is provided above each plate 34 and 35. A pin hole into which 22 is inserted is drilled, and a support bar 36 that passes through and connects the plates 34 and 35 is fixed to the lower side of the plates 34 and 35. The support bar 36 protrudes from both sides of each of the plates 34 and 35 (see FIG. 4), and the connecting members 31a and 31b of the first holding body 25 described later are fixed to the protrusions, respectively. The 1 base end part 24 and the 1st holding body 25 are provided integrally. The second base end portion 26 of the second hand 12 has the same configuration as the configuration of the first base end portion 24 described above.

  The first holding body 25 has a vertical lattice portion 28 extending in the vertical direction and a horizontal lattice portion 29 extending in the horizontal direction, with the base end portion 24 of the hand 11 disposed on the upper side and the distal end portion disposed on the lower side. Consists of. The vertical lattice portion 28 of the first holding body 25 extends linearly and is arranged in a direction intersecting the arch members 30a, 30b, 30c, and one end portion is coupled to the protruding end portion of the support bar 36, and 1 The two connecting members 31a and 31b forming the outer surface of the holding body 25 and the linearly extending and arranged in the direction intersecting the arch members 30a, 30b and 30c, and the arch members 30a, 30b and 30c It is comprised by the some connection member 31c to connect. The horizontal lattice portion 29 of the first holding body 25 is configured by three arch members 30a, 30b, and 30c that are curved in a bow shape so as to bulge outward with the same curvature, and are arranged in parallel at a predetermined interval. Is done. The 1st holding body 25 is formed by welding these arch members 30a, 30b, and 30c, and the connection members 31a, 31b, and 31c in a grid | lattice form, and connecting. The second holding body 27 also has the same configuration as that of the first holding body 25 described above.

  As shown in FIG. 3 and the like, the arch members 30a, 30b, and 30c are curved in a bow shape so as to bulge outward (that is, on the opposite side of the other hand that is oppositely disposed) in a bottom view. In the case where a tonback having a height of about 1 m and a diameter of about 120 cm to 130 cm is used as a processing target in a state in which the contents are filled to the maximum, for example, the lateral lattice portion 29 has a curvature radius of 60 to 70 cm. Preferably, the three arch members 30a, 30b, 30c that are curved in a certain bow are arranged in parallel at intervals (pitch) of 45 to 55 cm. In this embodiment, the radius of curvature is set to 65 cm. The arch members 30a, 30b, 30c are arranged in parallel at intervals of 50 cm. Each of the arch members 30a, 30b, 30c and the connecting members 31a, 31b, 31c forming the first holding body 25 is a solid steel material having a circular cross section and rounded ends, and is in contact with the object to be processed. I try to keep the back from breaking as much as possible. The arch members 30a ', 30b', 30c 'constituting the horizontal lattice portion 29' of the second holding body 27 also have the same configuration as that of the arch members 30a, 30b, 30c described above.

  In the present embodiment, the distal end portions of the connecting members 31a and 31b forming the first holding body 25 protrude from the horizontal lattice portion 29 (arch member 30a) disposed on the distal end side. Similarly, the distal end portions of the connecting members 31a 'and 31b' forming the second holding body 27 protrude from the horizontal lattice portion 29 '(arch member 30a') disposed on the distal end side. By projecting the distal end portions of the connecting members 31a, 31b, 31a ′, 31b ′ from the arch members 30a, 30a ′ disposed on the distal end side, the flexible container backs 41 disposed close to or in close contact with each other (FIG. 1). The tip of the hydraulic excavator attachment 1 can be easily inserted into the gap between the two, and the individual objects to be processed can be easily grasped. In addition, this protrusion amount can be changed arbitrarily.

  A hydraulic cylinder for turning the first and second hands 11 and 12 to freely open and close is incorporated between the base plates 32 and 33, and high-pressure oil supplied from the power unit 7 is supplied to a hydraulic circuit (not shown). ), And the first and second hands 11 and 12 can be opened and closed at an arbitrary opening from the open position to the closed position. As a connecting means for connecting the hydraulic cylinder to the first and second hands 11 and 12, various known structures can be employed (see Patent Documents 1 to 3). For example, two hydraulic cylinders directly connected to the base end side of each hand 11 and 12 may be incorporated and opened and closed (see Patent Document 2, FIG. 1, paragraph [0011]). Each of the hands 11 and 12 may be opened and closed by a single hydraulic cylinder with a link mechanism interposed in the cylinder (see Patent Document 1 FIGS. 1 to 3, Patent Document 3 FIG. 2, paragraphs [0013] and [0014] ]reference).

  As described above, the decontamination waste accommodated in the flexible container bag 40 is sequentially placed on a truck and transported to an intermediate storage facility where it is separated, but it is extremely dangerous if the contaminants contained in the container are scattered or leaked. For this reason, it is necessary to handle the flexible container bag 40 with careful consideration for safety. Next, the operation (action) of the attachment 1 for a hydraulic excavator will be described. FIG. 5 is a diagram showing the hydraulic excavator attachment 1 in the open position from the front side, and FIG. 6 is a diagram showing the hydraulic excavator attachment 1 shown in FIG. 5 with a part omitted from the bottom side. 7 is a view showing the attachment 1 for a hydraulic excavator in the closed position from the front side, and FIG. 8 is a view showing the state in which the flexible container back 40 is held from the front side.

  The first holding body 25 and the second holding body 27 are separated from each other by hydraulic pressure with the connecting pins 22 and 23 to which the base end portions 24 and 26 are connected as rotation axes. Then, from the open position (see FIGS. 5 and 6) that spreads outward, it can be freely opened and closed from the closed position (see FIG. 7) where the tip of the first holding body 25 and the tip of the second holding body 27 come into contact with each other To do. As described above, the flexible container bags 40, which are objects to be processed, are stacked in close contact or close to each other. Therefore, as shown in FIG. 1, after moving each holding body 25, 27 to a substantially parallel position, the boom 8, the arm 9, etc. are operated to project the connecting members 31a, 31b, 31a ′, 31b ′. The portion is inserted into the gap between the flexible container backs 40 and lowered until the arm members 30 a, 30 a ′ on the tip side are positioned near the bottom of the flexible container back 40. Next, by moving the holding bodies 25 and 27 inward, the processing object can be sandwiched between the curved holding bodies 25 and 27 (see FIG. 8). Since each holding body 25 and 27 is curved corresponding to the shape of the flexible container bag 40 that is the processing object, the holding object 25 can be lifted by holding the processing object from below, and the back body of the flexible container bag 40 Even if it is worn due to aging or the like, it can be lifted and transported without breaking or dropping it. In addition, each of the hands 11 and 12 is curved in a bow shape so that the lateral lattice portions 29 and 29 ′ swell outwardly corresponding to the outer shape of the flexible container bag 40 that is the processing target, Since the flexible container bag 40 can be easily held from the side or from the side, the cargo handling operation can be performed quickly. Thus, according to the present invention, each of the pair of hands 11, 12 arranged to face each other includes the holding bodies 25, 27 curved in a bow shape so as to bulge outwardly. A storage space (pocket) corresponding to the shape (bag shape) of the processing object is defined between the two, and the hands 11 and 12 are controlled to open and close to hold the processing object from the bottom. Even if the suspension belt 41 of the flexible container bag 40 or its base part is worn or damaged, the flexible container bag 40 can be safely lifted and transported without causing the flexible container bag 40 to bite.

  After the flexible container back 40 is held and transported to a predetermined position (for example, on the truck bed), each of the hands 11 and 12 is opened outward and the flexible container bag 40 is placed. Since each hand 11 and 12 can be opened to an open position (refer FIG. 5, FIG. 6), the flexible container back | bag 40 can be released easily. By forming the holding bodies 25 and 27 in a lattice shape or a ladder shape, the hands 11 and 12 are closed and the flexible container back 40 is lifted up, and the transfer operation can be performed safely while confirming the state of the flexible container bag 40 from the outside. The dust attached to the outer surface of the flexible container bag 40 can be removed from the gaps in the lattice and contributes to the weight reduction of the entire attachment.

  By the way, the flexible container bag 40 in which decontaminated waste such as topsoil and vegetation removed by decontamination is stored may be filled to the maximum or may be small in capacity. There are wards every 40th. Since the container is a non-solid material such as topsoil, when the flexible container bag 40 is lifted, the bag body is deformed according to the amount of the internal capacity. Therefore, when trying to lift using an attachment provided with a claw as shown in Patent Document 1, it is lifted by pinching so as to sandwich the side surface of the back body, and the back is held on the gripping portion. There is a problem that the back body, which has deteriorated over time due to the concentration of its own weight, is easily broken. In this respect, according to the present invention, it is possible to lift the object to be processed from the bottom as described above. For example, when lifting the flexible container bag 40 having a small internal volume, The holding bodies 25 and 27 can be rotated inward (see FIG. 8), and the processing object can be enclosed in the accommodation space so as not to fall.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention. For example, the connecting pins 22 and 23 of the present embodiment are fixed to the base 17 side, and pin holes are drilled on the base end portions 24 and 26 side of the hands 11 and 12, respectively. The first and second hands may be pivotally supported with respect to the base by fixing a connecting pin on the base end side of the hand and providing a pin hole on the base side. In the present embodiment, the holding bodies 25 and 27 have a lattice shape, but a plurality of arch members are connected between two connecting members so as to be bridged at a predetermined interval so as to be formed in a ladder shape. Anyway. Further, the curvature of the arch member is arbitrarily changed according to the shape of the processing object. The number of arch members and connecting members constituting the holding body can be arbitrarily changed.

  The present invention can be used by being widely mounted on a generally used hydraulic excavator such as a backhoe, and can be suitably used for a cargo handling operation for lifting and transferring a processing object accommodated in a flexible container back. The object is not limited to this, and can be used for transferring a drum, for example. It can also be used for dismantling and unloading various processing objects.

DESCRIPTION OF SYMBOLS 1 Attachment for hydraulic excavators 2 Hydraulic excavators 3 Crawler 4 Turning device 5 Upper turning body 6 Driver's cab 7 Power unit 8 Boom 9 Arm 11 First hand 12 Second hand 13 Hydraulic cylinder 14 Front link 15 Bracket 16 Turning device 17 Base 22, 23 Connecting pin 24 First base end portion 25 First holding body 26 Second base end portion 27 Second holding body 28 Vertical lattice portion 29 Horizontal lattice portion 30 Arch member 31 Connecting member 32, 33 Base plate 34, 35 Plate 36 Support rod Material 40 Flexible container 41 Hanging belt

Claims (3)

A pair of connecting pins arranged in parallel with a predetermined interval is attached, and a base attached to the tip side of the arm of the excavator;
A first base end portion pivotally supported by one of the connecting pins and a first holding body integrally formed on the first base end portion and formed in a ladder shape or a lattice shape. Hands and
A second base end pivotally supported by the other connecting pin, and a second holding body formed integrally with the second base end and formed in a ladder shape or a lattice shape, A second hand disposed opposite the first hand;
Have
Each of the first holder and the second holder is
A plurality of arch members that curve in a bow so as to bulge outward, are arranged in parallel at a predetermined interval, and constitute a horizontal lattice portion;
A plurality of connecting members extending linearly and arranged in a direction intersecting the arch member, and constituting a vertical lattice portion;
Is formed by connecting them in a ladder shape or a lattice shape,
The first hand and the second hand are:
From the open position where the first holding body and the second holding body are spaced apart from each other and spread outwardly with each of the connecting pins as a rotation center by hydraulic pressure, the tip of the first holding body and the second holding body An attachment for a hydraulic excavator, wherein the excavator pivots so as to be freely opened and closed between a closed position where the tips contact each other.   2. The hydraulic pressure according to claim 1, wherein the horizontal lattice portion is configured by arranging three arch members having a curvature radius of 60 to 70 cm, which are curved like a bow, in parallel at intervals of 45 to 55 cm. Excavator attachment. The attachment for a hydraulic excavator according to claim 1 or 2, wherein a distal end portion of the connecting member extends and extends from the horizontal lattice portion disposed on the distal end side.

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