JP2023117065A - Construction machine - Google Patents

Abstract

To prevent generation of excessive bending following elevation motion of a work device in supply/distribution piping which allows hydraulic fluid supplied to the work device to circulate therein, and improve the life of the supply/distribution piping.SOLUTION: A hydraulic shovel includes a work machine body 10, a work device 20 which is provided on the work machine body 10 so as to be elevated, and is operated by a hydraulic cylinder, and supply/distribution piping 27 which is provided so as to extend along the work device 20, and allows hydraulic fluid supplied to the hydraulic cylinder to circulate therein. The supply/distribution piping 27 has such flexibility as to be bent between a mounting member on the side of the work machine body 10 and a mounting member on the side of the work device 20. A rotary clamp 30 as the mounting member on the side of the work device 20 of the supply/distribution piping 27 has a support member 50 for supporting the supply/distribution piping 27. The support member 50 is rotated around a rotation shaft A2 parallel to a rotation shaft A1 (rotation shaft to work machine body 10 of work device 20) of a boom 21, relative to the work device 20, according to movement of the supply/distribution piping 27 by elevation of the work device 20.SELECTED DRAWING: Figure 5

Description

TECHNICAL FIELD The present invention relates to construction machinery, and more particularly to technology for protecting supply and discharge pipes in hydraulic excavators and the like.

Conventionally, in construction machines of this type, techniques for protecting supply and discharge pipes are known. The supply/discharge pipe extends along the working device, and circulates hydraulic oil supplied to hydraulic cylinders for driving components of the working device, such as a boom, an arm, and a bucket. A representative example of the supply/discharge piping is a hydraulic hose that connects the working machine body and the working device.

As a technique for protecting supply and discharge pipes, for example, a construction machine described in Patent Literature 1 can be cited. In this construction machine, the supply and discharge pipes are routed so as to be able to bend between the attachment member on the work machine body side and the attachment member on the work device side, and when the work device moves up and down with respect to the work machine body, In addition, by making the bendable portion of the supply/discharge pipe bend, variations in the distance between the mounting members are absorbed. By adding a steel plate to the curved portion of the supply/discharge pipe, it is possible to suppress the occurrence of extreme bending of the supply/discharge pipe due to the curved portion hanging down due to its own weight.

Further, in Patent Document 2, by connecting the supply and discharge pipes to a plate that freely moves following the movement of the boom, a curved portion (flexible portion) is positioned closer to the main body of the work machine than the plate. The construction machine that was built is described. As a result, the curved portion of the supply/discharge pipe is kept away from a position where it may interfere with other members, and the occurrence of damage to the curved portion is suppressed.

JP-A-10-280474 JP-A-8-199614

Since the working device moves up and down over a wide range with respect to the working machine main body, depending on the posture of the working device, the curved portion of the supply/discharge pipe may be greatly bent. As a result, in all postures from the highest state to the lowest state of the work equipment, the minimum allowable bending amount for the supply and discharge pipes cannot be secured, and the load on the supply and discharge pipes increases. and may shorten its life.

However, in the construction machine described in Patent Document 1, although the steel plate suppresses the occurrence of extreme bending due to the drooping of the supply/discharge pipe due to its own weight, the occurrence of the bending of the supply/discharge pipe itself following the elevation movement of the work device. is not intended to suppress Moreover, the construction machine described in Patent Document 2 aims to arrange the curved portion of the supply/discharge pipe at a position that does not interfere with other members. Therefore, even with the technique described in Patent Document 2, it is not possible to suppress the occurrence of the bending of the supply/discharge pipe following the elevation movement of the working device.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and an object of the present invention is to provide a supply/discharge pipe through which hydraulic oil to be supplied to a working device is circulated so as to be bent excessively so as to follow the elevation movement of the working device. To provide a construction machine capable of suppressing the occurrence of sagging and extending the life of supply and discharge piping.

In order to achieve the above object, the construction machine of the present invention comprises a work machine main body, a work device provided on the work machine main body so as to be vertically movable and operated by a hydraulic cylinder, and a working device extending along the work device. In a construction machine having a supply/discharge pipe through which hydraulic oil supplied to the hydraulic cylinder flows, the supply/discharge pipe is provided between a mounting member on the side of the working machine body and a mounting member on the side of the working device. and the mounting member of the supply/discharge pipe on the side of the work device has a support member for supporting the supply/discharge pipe, and the support member is adapted to raise and lower the work device. According to the movement of the supply/discharge pipe due to the movement of the work device, the work device rotates around a rotation axis parallel to the rotation shaft of the work device relative to the work machine main body.

With this configuration, the supporting member of the supply/discharge pipe rotates with respect to the work equipment in accordance with the movement of the supply/discharge pipe due to the elevation movement of the work equipment. The plumbing can be supported with as little pressure as possible. Therefore, it is possible to suppress the occurrence of local bending of the supply/discharge piping.

According to the construction machine of the present invention, the supply/discharge pipe through which hydraulic oil supplied to the work equipment is circulated is prevented from being excessively bent in response to the elevation movement of the work equipment, thereby improving the service life of the supply/discharge pipe. It is possible to

1 is a side view showing an example of a hydraulic excavator as a construction machine according to an embodiment; FIG. FIG. 4 is a perspective view showing an example of a mounting member for a supply/discharge pipe in the vicinity of the base end of the boom; FIG. 4 is a perspective view showing an example of a member for attaching a supply/discharge pipe to a boom; FIG. 11 is an explanatory diagram showing the state of the rotating clamp and the supply/discharge piping when the boom is lowered to its lowest position; FIG. 10 is an explanatory diagram showing the state of the rotating clamp and the supply/discharge piping when the boom is raised to its highest position;

An embodiment of the present invention will be described below with reference to the drawings. In the following description, the front-rear direction, the left-right direction, and the up-down direction of the construction machine are expressed mainly by the operator who gets on the construction machine.

1 is a side view showing an example of a hydraulic excavator as a construction machine according to an embodiment; FIG. The hydraulic excavator 1 is a device used, for example, for excavating earth and sand at a construction site. As illustrated, the hydraulic excavator 1 includes a working machine body 10 and a working device 20 .

(Work machine body)
The work machine main body 10 includes a lower travel body 11 and an upper revolving body 12 . The undercarriage 11 includes a crawler 11a as a driving device for causing the hydraulic excavator 1 to travel in this embodiment. The crawler 11a is driven by a traveling hydraulic motor (not shown).

The upper revolving body 12 is rotatably provided on the lower traveling body 11 . The upper revolving body 12 is driven by a revolving hydraulic motor (not shown) to revolve. A driver's cab 13 in which an operator rides is provided on the front portion of the frame 12a of the upper swing body 12. As shown in FIG. A fuel tank 14 , a machine room 15 , a counterweight 16 and the like are provided behind the operator's cab 13 of the upper swing body 12 . An engine (not shown) and a hydraulic pump (not shown) driven by the engine are mounted in the machine room 15 . A hydraulic pump (not shown) pressure-feeds hydraulic oil supplied to each component of the traveling hydraulic motor, the turning hydraulic motor, and the working device 20, which will be described later, thereby operating each hydraulic device.

(work device)
The work device 20 is attached to the front portion of the frame 12 a of the upper swing body 12 . The working device 20 is an articulated working mechanism, and includes a boom 21 , an arm 22 , a bucket 23 , a plurality of hydraulic cylinders 24 , 25 and 26 , and a plurality of supply/discharge pipes 27 .

A base end portion 21 a of the boom 21 is connected to the upper swing body 12 so as to be vertically movable. The boom 21 moves up and down with respect to the upper revolving body 12 about a rotation axis A1 (see FIGS. 4 and 5) extending in the paper surface direction of FIG. The arm 22 is connected to the tip portion 21b of the boom 21 so as to be vertically movable about an axis parallel to the rotation axis A1. The bucket 23 is a hydraulic working tool for performing excavation work or the like, and is connected to the arm 22 so as to be vertically movable about an axis parallel to the rotation axis A1. Note that when the bucket 23 is replaced with a hydraulic breaker or a hydraulic crusher, the device after replacement functions as a hydraulic working tool.

The hydraulic cylinder 24 is connected between the upper swing body 12 and the boom 21, and expands and contracts with hydraulic pressure to raise and lower the boom 21 with respect to the upper swing body 12, thereby adjusting the angle. The hydraulic cylinder 25 is connected between the boom 21 and the arm 22 and expands and contracts by hydraulic pressure to adjust the angle of the arm 22 . The hydraulic cylinder 26 is connected between the arm 22 and the bucket 23 and adjusts the angle of the bucket 23 by expanding and contracting with hydraulic pressure.

A plurality of supply/discharge pipes 27 are connected to each of the hydraulic cylinders 24, 25, and 26, and hydraulic oil pressure-fed from a hydraulic pump (not shown) circulates therein. In this embodiment, there are four supply/discharge pipes 27 (see FIG. 2). However, the number of supply/discharge pipes 27 is not limited to this. The supply/discharge pipe 27 may be any pipe that has flexibility and can circulate the hydraulic oil. In this embodiment, the supply/discharge piping 27 is a hydraulic hose. The supply/discharge pipe 27 is flexible, so that it can be bent according to the vertical movement of the boom 21 . A plurality of supply and discharge pipes 27 are installed so as to extend from the upper revolving body 12 along the boom 21 and the arm 22 of the work device 20, and clamping mechanisms, for example, are installed at a plurality of locations on the boom 21 and the arm 22. attached through

With the above configuration, the hydraulic excavator 1 is configured such that hydraulic oil pressure-fed from a hydraulic pump (not shown) is supplied to each hydraulic cylinder 24 , 25 , 26 via a plurality of supply/discharge pipes 27 , so that each hydraulic cylinder 24 , 25 and 26 adjust the boom 21, arm 22 and bucket 23 to the angles required for the work.

(Installation structure for supply and discharge piping)
Next, as a main part of the hydraulic excavator 1 as a construction machine according to the embodiment, a mounting structure of a plurality of supply/discharge pipes 27 will be described in detail with reference to FIGS. 2 and 3. FIG. FIG. 2 is a perspective view showing an example of an attachment member for the supply/discharge pipe in the vicinity of the base end of the boom, and FIG. 3 is a perspective view showing an example of an attachment member for the supply/discharge pipe to the boom.

As shown in FIG. 2 , the plurality of supply/discharge pipes 27 are fixed to the upper revolving body 12 of the work machine body 10 via fixing clamps 28 as mounting members on the work machine body 10 side. Although detailed description is omitted, the fixed clamp 28 clamps the plurality of supply/discharge pipes 27 by a clamp mechanism (not shown). Moreover, the plurality of supply/discharge pipes 27 are fixed to the upper surface 211 of the boom 21 of the work device 20 via a rotating clamp 30 as an attachment member on the work device 20 side.

(Structure of rotating clamp)
The rotary clamp 30 has a first bracket 40 and a support member 50, as shown in FIG. The first bracket 40 is a U-shaped member having a substrate portion 40a and vertical wall portions 40b rising from both side ends of the substrate portion 40a. The first bracket 40 is made of, for example, a metal material, but is not limited to this material as long as it can ensure strength enough to withstand use in construction machinery. The substrate portion 40 a is fastened with bolts 6 to a plate 5 welded to the upper surface 211 of the boom 21 . The vertical wall portion 40b has a tapered end portion on the side opposite to the substrate portion 40a, so that the vertical wall portion 40b can easily slide with the support member 50, which will be described later. The standing wall portion 40b is formed to have a height such that the support member 50 and the supply/discharge pipe 27 do not interfere with other members such as the bolt 6 when the support member 50, which will be described later, rotates.

The support member 50 is a support portion that supports the plurality of supply/discharge pipes 27 and is rotatably connected to the first bracket 40 . The support member 50 has a second bracket 51 , a plate member 52 and a pair of clamps 53 .

The second bracket 51 is a U-shaped member having a substrate portion (second substrate portion) 51a and vertical wall portions (second vertical wall portions) 51b rising from both side ends of the substrate portion 51a. The second bracket 51 is made of, for example, a metal material, but the material is not limited to this as long as it can ensure strength enough to withstand use in construction machinery. When the second bracket 51 is arranged inside the first bracket 40, the vertical wall portion 51b contacts the vertical wall portion 40b of the first bracket 40 to such an extent that it can slide.

The plate-like member 52 is arranged to face the surface of the substrate portion 51a on which the standing wall portion 51b rises. The plate-shaped member 52 is formed of, for example, a metal material, but is not limited to this as long as it can ensure strength enough to withstand use in construction machinery. In the example shown in FIG. 3, the plate-like member 52 has a length in the longitudinal direction shorter than that of the second bracket 51, but can hold a pair of clamps 53 together with the second bracket 51, allowing the support member 50 to rotate. Any size that does not interfere with

A pair of clamps 53 are arranged between the second bracket 51 and the plate member 52 to directly sandwich the supply/discharge pipe 27 . The pair of clamps 53 are made of a material with relatively high elasticity, such as rubber, and thereby properly protect the supply/discharge pipe 27 that is in direct contact with them. The pair of clamps 53 are placed on the base plate portion 51a of the second bracket 51 and abut against the both wall portions 51b. Moreover, as shown in the figure, the pair of clamps 53 are formed with a plurality of notches 53s into which the supply/discharge pipes 27 are inserted. The pair of clamps 53 abut each other so as to sandwich the supply/discharge pipe 27 within the notch 53s.

The second bracket 51 , the plate member 52 and the pair of clamps 53 are fastened with a plurality of fastening materials 54 . The multiple fasteners 54 are, for example, bolts and nuts. The substrate portion 51 a of the second bracket 51 , the plate-like member 52 and the pair of clamps 53 are formed with holes (not shown) through which bolts are inserted so as not to interfere with the plurality of supply/discharge pipes 27 . A bolt is inserted through the hole from the plate-like member 52 side, and a nut is screwed into the inserted bolt on the base plate portion 51a side of the second bracket 51, so that the second bracket 51 and the plate-like member 52 are joined together. It is fastened with a fastening material 54 . As a result, the second bracket 51 , the plate-like member 52 and the pair of clamps 53 are integrated, and the supply/discharge pipe 27 is clamped by the second bracket 51 , the plate-like member 52 and the pair of clamps 53 . Become.

In the support member 50 configured as described above, the upright wall portion 51b of the second bracket 51 is pin-coupled to the upright wall portion 40b of the first bracket 40 via the pin 55 . Thereby, the support member 50 is rotatably connected to the first bracket 40 . At this time, the rotation axis A2 (see FIGS. 4 and 5) of the support member 50 is arranged so as to be parallel to the rotation axis A1 of the boom 21 described above.

(Action of Embodiment: Action of Rotating Clamp)
Next, as an operation of the embodiment, the operation of the rotating clamp 30 will be described with reference to FIGS. 4 and 5. FIG. FIG. 4 is an explanatory diagram showing the state of the rotating clamp and the plurality of supply/discharge pipes when the boom is at its lowest point, and FIG. It is an explanatory diagram showing.

In the following description, the state in which the support member 50 is shown in FIG. 3, that is, the state in which the base plate portion 51a and the plate-like member 52 are parallel to the upper surface 211 of the boom 21, is referred to as the "horizontal state of the rotating clamp 30". Further, in the following description, the rotation of the supporting member 50 in any direction from the horizontal state of the rotating clamp 30 is referred to as "rotation of the rotating clamp 30".

As shown in FIG. 4, the distance between the fixed clamp 28 and the rotating clamp 30 is the longest when the boom 21 is at its lowest position, in which the tip 21b (see FIG. 1) of the boom 21 is at its lowest position. The supply/discharge pipe 27 is routed so as to ensure a sufficient length required in this state. In this state, the supply/discharge pipe 27 extends from the fixed clamp 28 to the rotating clamp 30 in an arc shape along the axis of rotation A2 at a position away from the boom 21, and then 211 is routed. At this time, the rotating clamp 30 is in a horizontal state along the extending direction of the supply/discharge pipe 27 . It should be noted that the pivot clamp 30 need not be perfectly horizontal. It is preferable that the rotating clamp 30 is not tilted toward the boom 21 on the work machine main body 10 side. As a result, the rotation clamp 30, which will be described later, can be prevented from rotating in the direction indicated by the arcuate arrow in FIG. can be avoided. Note that the rotating clamp 30 may include a stopper that prevents the work machine body 10 side from tilting toward the boom 21 from the horizontal state.

As the boom 21 is raised and lowered from the lowest position of the boom 21, the fixed clamp 28 and the rotating clamp 30 are brought closer to each other. As shown in FIG. 5, the distance between the fixed clamp 28 and the rotatable clamp 30 is the shortest when the boom 21 is raised to the highest position with the tip 21b of the boom 21 (see FIG. 1). Here, as described above, the supply/discharge pipe 27 is flexible and bendable. Therefore, the supply/discharge pipe 27 moves in the direction in which the portion between the fixed clamp 28 and the rotating clamp 30 moves away from the upper surface 211 of the boom 21 as the fixed clamp 28 and the rotating clamp 30 approach each other due to the vertical movement of the boom 21 . move in a curved manner. That is, the supply/discharge pipe 27 is flexed. In other words, by setting the length of this deflection in the supply/discharge pipe 27 in advance, the variation in the distance between the fixed clamp 28 and the rotating clamp 30 can be absorbed. The supply/discharge pipe 27 is in the most bent state when the boom 21 is raised as shown in FIG.

When the plurality of supply/discharge pipes 27 are bent as described above, the rotating clamp 30 rotates in a direction in which the working machine main body 10 side moves away from the boom 21 as indicated by the arcuate arrows in FIG. That is, the supply/discharge pipe 27 tries to maintain a state in which it is not bent as much as possible in the vicinity of the rotary clamp 30 due to its own rigidity, and the rotary clamp 30 tries to maintain a state in which the supply/discharge pipe 27 is not bent. It follows the force and rotates. In other words, it can be said that the rotary clamp 30 supports the supply/discharge pipe 27 while not pressing it down as much as possible.

On the other hand, the dashed lines shown in FIG. 5 indicate, as a comparative example, the shape of the plurality of supply/discharge pipes 27 when the rotary clamp 30 does not rotate. "When the rotating clamp 30 does not rotate" means that the rotating clamp 30 is always fixed in the horizontal state shown in FIG. In this case, since the posture of the clamp position is fixed, the supply/discharge pipe 27 is pressed toward the boom 21 near the clamp position, and a relatively large bending moment is applied. As a result, the supply/discharge pipe 27 is locally bent in the vicinity of the clamp position. As described above, the rotating clamp 30 of the embodiment rotates so as not to press the supply/discharge pipe 27 as much as possible, so that the bending moment applied to the supply/discharge pipe 27 can be reduced compared to the comparative example. becomes possible.

(Effect of Embodiment)
As described above, the hydraulic excavator 1 as a construction machine according to the embodiment includes a working machine body 10 and a working device 20 which is provided on the working machine body 10 so as to be vertically movable and which is operated by hydraulic cylinders 24 , 25 and 26 . and a supply/discharge pipe 27 extending along the working device 20 and through which hydraulic oil supplied to the hydraulic cylinders 24, 25, and 26 flows. The supply/discharge pipe 27 has flexibility so that it can be bent between the attachment member on the work machine body 10 side and the attachment member on the work device 20 side. A rotating clamp 30 as a member for attaching the supply/discharge pipe 27 to the work device 20 has a support member 50 that supports the supply/discharge pipe 27 . The support member 50 is parallel to the rotation axis A1 of the boom 21 (the rotation axis of the work device 20 with respect to the work machine main body 10) with respect to the work device 20 in accordance with the movement of the supply/discharge pipe 27 caused by the elevation of the work device 20. It rotates around the rotation axis A2.

With this configuration, the supporting member 50 of the rotating clamp 30 rotates with respect to the working device 20 in accordance with the movement of the supply/discharge pipe 27 caused by the elevation of the working device 20 , so that the rotating clamp 30 of the supply/discharge pipe 27 is moved. The supply and drainage lines can be supported while minimizing constrained movement in the vicinity. As a result, local bending of the supply/discharge pipe 27 can be suppressed. Therefore, according to the embodiment, the supply/discharge pipe 27 through which the hydraulic oil supplied to the working device 20 flows is prevented from being excessively bent following the elevation movement of the work device 20. It is possible to improve the life.

In addition, since the occurrence of local bending of the supply/discharge pipe 27 can be suppressed, it is not necessary to set an extra length in advance so that the supply/discharge pipe 27 can be bent with a margin. Therefore, the length of the supply/discharge pipe 27 can be shortened. Furthermore, by suppressing local bending of the supply/discharge pipe 27, a sufficient space can be secured between the supply/discharge pipe 27 and the upper surface 211 of the boom 21, and other parts arranged on the upper surface 211 of the boom 21 can be secured. Interference between the member and the supply/discharge pipe 27 can be suppressed.

Further, the rotating clamp 30 has a U-shaped first bracket 40 having a substrate portion 40a attached to the work device 20 and vertical wall portions 40b rising from both side ends of the substrate portion 40a. 50 is rotatably connected to the standing wall portion 40b of the first bracket 40 .

With this configuration, the rotary clamp 30 can be configured simply by the U-shaped first bracket 40 and the support member 50 that serves as the rotary portion. Further, by simply adjusting the height of the standing wall portion 40b of the first bracket 40, it is possible to prevent the support member 50 and the supply/discharge pipe 27 from interfering with other members when the support member 50 rotates. . In order to prevent the support member 50 and the supply/discharge pipe 27 from interfering with other members, the rotation clamp 30 may be provided with a stopper that stops the rotation of the support member 50 at a predetermined angle.

The support member 50 is a U-shaped member having a substrate portion (second substrate portion) 51a and vertical wall portions (second vertical wall portions) 51b rising from both side ends of the substrate portion 51a. a second bracket 51 rotatably connected to the vertical wall portion 40b of the first bracket 40; , and a pair of clamps 53 arranged between the second bracket 51 and the plate-like member 52 and formed with a notch 53s into which the supply/discharge pipe 27 is inserted. It is clamped by a bracket 51 , a plate member 52 and a pair of clamps 53 .

This configuration makes it possible to easily provide the rotary clamp 30 to the hydraulic excavator 1 . That is, after the U-shaped second bracket 51 is pin-coupled to the first bracket 40, the half portions 53a (see FIG. 3) of the pair of clamps 53 are placed on the substrate portion 51a and The supply/discharge pipe 27 is inserted. Then, after the half portions 53b (see FIG. 3) of the pair of clamps 53 are combined with the half portions 53a to sandwich the supply/discharge pipe 27, the plate member 52 is placed on the half portions 53b. Thus, the support member 50 can be easily assembled even after the plurality of supply/discharge pipes 27 have already been routed.

Further, the support member 50 is formed with a hole for inserting a fastening material for fastening the base plate portion 51a of the second bracket 51 and the plate member 52 at a position that avoids interference with the supply/discharge pipe 27. .

With this configuration, the entire support member 50 can be fastened and integrated with the fastening material 54 without interfering with the plurality of supply/discharge pipes 27 . In addition, in the present embodiment, the fastening position is the central portion of the support member 50 in the longitudinal direction, but the fastening position is not limited to this. The fastening position may be a position where the second bracket 51 and the plate-like member 52 can be securely fastened without interfering with the plurality of supply/discharge pipes 27 . At least one fastening material 54 may be used, or three or more fastening materials 54 may be used as long as the fastening material 54 can stably hold the support member 50 .

Although the description of the embodiment is finished above, the aspect of the present invention is not limited to this embodiment. For example, in the above-described embodiment, the attachment structure of the supply/discharge pipe 27 to the boom 21 of the hydraulic excavator 1 is embodied.

Reference Signs List 1 hydraulic excavator 10 work machine main body 20 work device 27 supply/discharge piping 28 fixed clamp 30 rotating clamp (mounting member on the work device side)
40 first bracket 40a substrate portion 40b vertical wall portion 50 support member 51 second bracket 51a substrate portion (second substrate portion)
51b standing wall portion (second standing wall portion)
52 plate-like member 53 pair of clamps 54 fastening material

Claims (4)

a working machine body, a working device that is vertically movable on the working machine body and is operated by a hydraulic cylinder; In a construction machine having a supply and discharge piping that
the supply/discharge pipe has flexibility so as to be bendable between a mounting member on the working machine main body side and a mounting member on the working device side;
the mounting member of the supply/discharge pipe on the working device side has a support member for supporting the supply/discharge pipe;
The support member rotates relative to the working device about a rotation axis parallel to a rotation axis of the working device relative to the working machine main body in accordance with movement of the supply/discharge pipe caused by elevation of the working device. A construction machine characterized by: The mounting member has a U-shaped first bracket having a substrate portion attached to the working device and vertical wall portions rising from both side ends of the substrate portion,
2. The construction machine according to claim 1, wherein said support member is rotatably connected to said standing wall portion of said first bracket. The support member is
A U-shaped member having a second substrate portion and second vertical wall portions rising from both side ends of the second substrate portion, the second vertical wall portion being rotatable to the vertical wall portion of the first bracket. a second bracket connected to the
a plate-shaped member arranged to face the surface of the second substrate portion on which the second standing wall portion rises;
a pair of clamps arranged between the second bracket and the plate-shaped member and having a notch into which the supply/discharge pipe is inserted;
3. The construction machine according to claim 2, wherein said supply/discharge pipe is clamped by said second bracket, said plate member and said pair of clamps. The support member is formed with a hole for inserting a fastening material for fastening the second base plate portion of the second bracket and the plate member at a position to avoid interference with the supply/discharge pipe. The construction machine according to claim 3, characterized in that:

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