JP4609570B2 - Construction machine frame structure - Google Patents

Description

  The present invention relates to a frame structure of a construction machine.

  Conventionally, a construction machine such as a hydraulic excavator having a crawler type lower traveling body, an upper revolving body that is rotatably mounted on the lower traveling body, and a work attachment provided on the front side of the upper revolving body is known. (For example, refer to Patent Document 1). On the lower side of the upper revolving structure, a revolving frame is provided as a support structure for mounting an engine, a hydraulic pump, a driver's seat, a counterweight, and the like. The swivel frame has a configuration in which reinforcing ribs are welded to the left and right sides of the center portion in the width direction of the flat bottom plate so as to obtain strength and rigidity against excavation load during excavation work.

  Here, when the thickness of the bottom plate of the revolving frame is thin, welding distortion may occur during welding of the reinforcing rib. In order to eliminate such welding distortion, a frame structure of a construction machine has been developed in which a swivel frame and a reinforcing rib are integrally formed by casting to obtain sufficient strength and rigidity (for example, Patent Documents). 2-4).

Here, in the frame structure of a conventional construction machine, in particular, the frame structure described in Patent Document 4, the upper flange and the lower flange are provided to cover the equipment mounted on the swing frame of the upper swing body, such as the engine and the hydraulic pump. A cover having a flange is attached to the periphery of the swivel frame. Specifically, a hexagon socket head cap screw as a protruding body is attached to the peripheral portion of the turning frame. A fitting hole corresponding to the bolt hole of the hexagon socket head cap bolt is formed in the lower flange of the cover. Then, the bolt head of the hexagon socket head bolt and the fitting hole of the lower flange of the cover are fitted, the cover is positioned, and the upper flange is fastened with fastening bolts, etc., so that the cover is attached to the turning frame. ing.
JP 2001-107388 A Japanese Patent Laying-Open No. 2005-2572 JP 2007-303129 A JP 2008-7966 A

  However, in the frame structure of the conventional construction machine, the parts cost and the mounting work cost of the hexagon socket head bolt used for positioning the cover increase, so that the cover can be positioned without using such separate parts. A frame structure was desired.

  Furthermore, as another problem, in the conventional construction machine frame structure, the revolving frame is integrally formed by casting, so the flatness such as the bracket part for mounting the engine and the attachment part of the work attachment is required. As for, it is necessary to ensure flatness by cutting after casting. Specifically, when cutting the swivel frame, a plurality of reference portions having a horizontal reference surface on the upper surface are provided at intervals in the left-right direction of the swivel frame, and the reference surface is installed on the work table. In order to ensure flatness, the corresponding part is cut.

  However, such a reference portion becomes an unnecessary member after the cutting work for ensuring flatness is completed, and thus becomes an obstacle when handling the electrical wiring and the hydraulic tube in the swivel frame. There was a problem that.

  The present invention has been made in view of such a point, and the object thereof is to facilitate the positioning of the side cover and the horizontal reference surface of the swivel frame after casting when the hydraulic tube or the like is routed. It can be installed so as not to get in the way.

  In order to achieve the above-described object, the present invention is configured such that the guide portion for positioning the side cover and the reference portion having the horizontal reference surface are combined with one member.

  Specifically, the present invention is directed to a frame structure of a construction machine including side covers that are erected on both the left and right sides of the upper swing body so as to cover the equipment mounted on the upper swing body. A solution was taken.

That is, the invention of claim 1 includes a turning frame disposed on the lower side of the upper turning body,
The swivel frame has left and right side walls standing upright from the left and right edges of the bottom plate of the swivel frame, and a gap for fitting the left and right side walls and the lower edge of the side cover. And a plurality of guide portions erected from the bottom plate of the revolving frame are integrally formed by casting,
The upper surfaces of the plurality of guide portions are formed in substantially the same plane and constitute a horizontal reference surface.

  In the invention of claim 1, the turning frame is arranged on the lower side of the upper turning body. The swivel frame has left and right side walls standing upright from the left and right edges of the bottom plate, and gaps for fitting the left and right side walls and the bottom edge of the side cover. A plurality of guide portions erected from the bottom plate are integrally formed by casting. The upper surfaces of the plurality of guide portions are formed in substantially the same plane and are configured as a horizontal reference surface.

  With such a configuration, the guide portion for positioning the side cover and the reference portion having the horizontal reference surface of the swivel frame can be used as one member. For this reason, compared with the case where a guide part and a reference | standard part are each provided in a turning frame separately, the piping space at the time of handling of electrical wiring and a hydraulic tube can be ensured, and workability | operativity improves. In addition, since the guide part is integrally formed with the revolving frame by casting, the parts cost and the installation cost can be reduced compared with the case where the guide part is attached to the revolving frame as a separate member, which is advantageous for cost reduction. It becomes.

The invention of claim 2 is the invention according to claim 1,
The guide portion is formed of a plate-like body that is long in the front-rear direction.

  In the invention of claim 2, the guide portion is formed of a plate-like body that is long in the front-rear direction. As a result, the contact area between the lower end edge of the side cover and the guide portion is widened, so that when the side cover is fitted in the gap between the left and right side walls and the guide portion, the side cover is moved in the thickness direction. It can be surely regulated, which is advantageous in suppressing backlash and the like of the side cover.

  According to the present invention, the guide part for positioning the side cover and the reference part having the horizontal reference surface of the swivel frame are used together as one member, so that the piping for handling the electrical wiring and the hydraulic tube is performed. A wide space can be secured and workability is improved. In addition, since the guide part is integrally formed with the revolving frame by casting, the parts cost and the installation cost can be reduced compared with the case where the guide part is attached to the revolving frame as a separate member, which is advantageous for cost reduction. It becomes.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature and is not intended to limit the present invention, its application, or its use.

  FIG. 1 is a side view showing a configuration of a construction machine according to an embodiment of the present invention, and FIG. 2 is a perspective view when the upper swing body is viewed obliquely from the rear. As shown in FIGS. 1 and 2, the construction machine 1 is a canopy-spec small excavator, a so-called mini excavator, and a lower traveling body 20 on which crawlers 21 and 21 are mounted and a swivel on the lower traveling body 20. And an upper revolving unit 30 mounted thereon. And it is comprised in the back small turning type so that the turning radius of the rear end of the upper turning body 30 may be settled within the vehicle width of the lower traveling body 20.

  The upper swing body 30 is provided with an operation space A for arranging the driver's seat 5, the control box 6, and the like. An engine storage space for storing the engine 40 is provided at the rear of the operation space A, and is covered with the engine cover 22. The engine 40 is supported by a support bracket 35 to be described later via an engine mount 41, so that the engine 40 is attached to the turning frame 31 disposed on the lower side of the upper turning body 30. On the upper side of the engine cover 22, a driver's seat 5 for an operator to sit is provided. On the left side of the driver's seat 5, an equipment space for storing hydraulic equipment is provided and covered with a side cover 23. A fuel tank (not shown) is provided on the right side of the driver seat 5 and is covered with a side cover 23.

  The left front of the driving space A is opened as an entrance for an operator to get on and off the driver's seat 5, and the floor F is provided with an uneven portion for preventing slipping and mud adhering to the shoe sole. It has been.

  A swing post 14 is provided on the front side of the upper swing body 30 to connect the front attachment 10 that can be replaced depending on the work application. A swing bracket 15 capable of rotating the front attachment 10 about a vertical axis 14a is connected to the swing post 14.

  The front attachment 10 includes a boom 11, an arm 12, a bucket 13, and a boom cylinder 11a, an arm cylinder 12a, and a bucket cylinder 13a for driving them, and a base end portion of the boom 11 is connected to a swing bracket 15. Yes. Here, when the boom cylinder 11a is extended and contracted, the boom 11 can be switched from a state where the boom 11 is tilted forward to a state where the boom 11 is driven to the driver's seat 5 side and lifted. The swing bracket 15 swings in the left-right direction by expanding and contracting the swing cylinder 15a (see FIG. 4).

  Control boxes 6 for performing various controls are provided on the left and right sides of the driver seat 5. An operation lever 7 for driving the front attachment 10 is provided at the front end of the control box 6.

  An operation lever 8 extending upward from the floor surface F of the upper swing body 30 is provided in front of the driver seat 5. By operating the operation lever 8, the lower traveling body 20 can be moved forward or backward. A lower front guard 9 that protects the lower position of the driver's seat 5 is disposed in front of the movable range of the operation lever 8.

  Further, surrounding the driver's seat 5, a front canopy post 25 is provided at the front right side, a rear canopy post 26 is provided at the rear right side, and a side canopy post is provided at the left side of the driver's seat 5 (side of the entrance / exit). 27 are erected. A roof 28 for protecting the operator against falling objects from the overhead is attached to each upper end portion of the front canopy column 25, the rear canopy column 26, and the side canopy column 27, and the roof 28 is operated. It supports so that it may arrange | position above the seat 5. FIG.

  Next, the structure of the turning frame 31 arranged on the lower side of the upper turning body 30 that is a characteristic part of the present invention will be described. 3 is a perspective view showing the configuration of the revolving frame, FIG. 4 is a plan view, and FIG. 5 is a plan view when the revolving frame is viewed from below.

  As shown in FIGS. 3 to 5, the turning frame 31 includes an engine 40 as a drive source, a hydraulic pump 43 that discharges hydraulic oil, a control valve 44 that controls supply of hydraulic oil discharged from the hydraulic pump 43, and the like. Is configured as a support structure for mounting a flat bottom plate 32, a front side wall 32a, a rear side wall 32b, a left side wall 32c, The side wall 32d and the support bracket 35 that supports the engine 40 are integrally formed by casting.

  The front side wall 32a and the rear side wall 32b of the revolving frame 31 are erected so as to be one step higher than the left side wall 32c and the right side wall 32d. A swing post 14 for connecting the front attachment 10 is integrally formed by casting at the front portion of the front side wall 32a. A cylinder insertion hole 29 penetrating in the thickness direction is formed on the left side of the swing post 14 in the front side wall 32a, and the rod tip of the swing cylinder 15a is inserted therethrough.

  On the front part of the rear side wall 32b of the revolving frame 31, a counterweight 33 is integrally formed by casting. The counter weight 33 is provided to balance the weight with the front attachment 10, and is formed as a thick and heavy plate.

  A swivel joint 50 is provided at the turning center position of the turning frame 31. The swivel joint 50 connects the hydraulic tubes 45 provided in the upper swing body 30 and the lower traveling body 20, respectively, and rotates in conjunction with the swing operation of the upper swing body 30. 45 is held so as not to twist.

  Reinforcing ribs 34 that are bifurcated from the vicinity of the swing post 14 of the front side wall 32a toward the rear side wall 32b are erected on the left and right sides of the center portion in the width direction of the bottom plate 32 of the swivel frame 31. The reinforcing rib 34 is integrally formed with the bottom plate 32 by casting so as to obtain strength and rigidity against excavation load during excavation work.

  A pipe insertion hole 34 a penetrating in the thickness direction is formed at the proximal end portion in the standing direction at a position closer to the front side of the reinforcing rib 34. The pipe insertion hole 34 a is a hole through which a hydraulic tube 45 connecting the hydraulic pump 43 and the control valve 44 respectively disposed at both left and right ends with the reinforcing rib 34 interposed therebetween is inserted.

  Specifically, a hydraulic pump 43 is disposed at the left rear position of the revolving frame 31, and a control valve 44 is disposed at the right front position, both of which are connected via a hydraulic tube 45. . The hydraulic tube 45 is bundled by a bundling member 46 and routed along the upper surface of the bottom plate 32 of the revolving frame 31, and is inserted through the pipe insertion hole 34 a of the reinforcing rib 34 in the middle thereof.

  In addition, a communication hole 34 b that penetrates in the thickness direction and communicates with the pipe insertion hole 34 a is formed at a position corresponding to the pipe insertion hole 34 a in the bottom plate 32 of the revolving frame 31. By forming such a communication hole 34b, when the turning frame 31 and the reinforcing rib 34 are integrally formed by casting, there is no need to arrange a core at a location corresponding to the pipe insertion hole 34a. The pipe insertion hole 34a can be easily formed simply by releasing the upper and lower parts.

  Specifically, at the time of casting the revolving frame 31, a core is not disposed at a position corresponding to the pipe insertion hole 34a of the reinforcing rib 34, but a corresponding position in the lower mold is bulged. . Therefore, when the molten metal is poured into a pair of upper and lower molds that are cast and cast, and then the revolving frame 31 is taken out by releasing the mold vertically, the bottom plate 32 of the revolving frame 31 corresponds to the bulging portion. Thus, the pipe insertion hole 34a and the communication hole 34b are formed, and the mold can be released smoothly. Thereby, the operation | work which attaches and removes a core becomes unnecessary, and the turning frame 31 and the reinforcement rib 34 can be integrally formed easily.

  Further, when the hydraulic tube 45 connecting the hydraulic pump 43 and the control valve 44 is routed along the upper surface of the bottom plate 32 of the revolving frame 31, the hydraulic tube 45 can be viewed from the communication hole 34b or via the communication hole 34b. The operation of gripping the hydraulic tube 45 and inserting it into the pipe insertion hole 34a can be easily performed. In addition, since the hydraulic tube 45 and other piping (for example, a pilot tube, etc.) can be separated from each other in the height direction, these tubes do not overlap each other, so that a sufficient working space can be provided during maintenance of the apparatus. It can be secured widely and workability is improved.

  An engine 40 (see FIG. 1) is mounted at the rear position of the turning frame 31. The engine 40 is supported by the support bracket 35 via the engine mount 41. The engine mount 41 is made of an elastic body such as resin or rubber, and absorbs vibration of the engine 40 to reduce transmission of the vibration to the revolving frame 31.

  The support bracket 35 is integrally formed with the turning frame 31 by casting. The support bracket 35 has an upright portion 35a that is erected from the bottom plate 32 of the revolving frame 31, and a flat surface portion 35b that protrudes horizontally from the upper end portion of the erected portion 35a. A bolt insertion hole 35c for inserting the fastening bolt 42 is formed in the flat portion 35b.

  Four support brackets 35 are arranged at intervals in the front, rear, left, and right inside the revolving frame 31, and the flat portions 35b are coplanar. The engine 40 is mounted on the flat surface portion 35b via an engine mount 41, and the engine 40 is fastened to the support bracket 35 by fastening bolts 42 inserted from below the engine 40 via bolt insertion holes 35c. .

  Of the plane portions 35b of the four support brackets 35, the plane portion 35b provided at the front left and right positions is from the upper end of the standing portion 35a that is erected from the substantially center position in the front-rear direction of the left and right reinforcing ribs 34. It protrudes inward in the horizontal direction. Further, the flat portion 35b provided at the left and right positions on the rear side protrudes from the upper end portion of the rear side wall 32b as the standing portion 35a toward the front in the horizontal direction.

  Here, a through hole 36 is formed in the bottom plate 32 of the revolving frame 31 at a position overlapping the flat portion 35b of the support bracket 35 in plan view. Specifically, the through-hole 36 corresponding to the flat portion 35b provided at the left and right positions on the front side is formed at a position where the swivel joint 50 can be visually recognized through the left and right reinforcing ribs 34. Further, the through hole 36 corresponding to the flat portion 35b provided at the left and right positions on the rear side penetrates so as to be surrounded by the rear side wall 32b and the left and right reinforcing ribs 34 and is positioned so that the engine 40 can be seen. Is formed.

  Thus, in the present embodiment, the through hole 36 is formed at a position that overlaps the planar portion 35b of the support bracket 35 in the bottom plate 32 of the revolving frame 31 in plan view. The reason is as follows.

  That is, when the swivel frame 31 and the support bracket 35 are to be integrally formed by casting, if there is a portion projecting in the horizontal direction, such as the flat portion 35b of the support bracket 35, it is melted into a mold combined with a pair of upper and lower sides. After casting the cast metal and casting it, the mold flows into the gap between the bottom plate 32 of the swivel frame 31 and the flat portion 35b of the support bracket 35 when the swivel frame 31 is taken out by releasing the mold up and down. Therefore, it is impossible to release the mold up and down. Therefore, it is conceivable to remove the core after casting so that the metal does not flow by placing the core in advance at the location corresponding to this gap, but because the installation and removal work of the core is required separately, There was a problem that the number of work steps increased.

  On the other hand, in the present embodiment, the core is not disposed at a position corresponding to the gap between the bottom plate 32 of the revolving frame 31 and the flat portion 35b of the support bracket 35, but a corresponding position in the lower mold. To bulge out. Therefore, when the molten metal is poured into a pair of upper and lower molds that are cast and cast, and then the revolving frame 31 is taken out by releasing the mold vertically, the bottom plate 32 of the revolving frame 31 corresponds to the bulging portion. Thus, the through hole 36 is formed, and the mold can be released smoothly. Thereby, the operation | work which attaches and removes a core becomes unnecessary, and the turning frame 31 and the support bracket 35 can be integrally formed easily.

  Further, since the through hole 36 corresponding to the flat portion 35b provided in the left and right positions on the front side is formed at a position where the swivel joint 50 can be visually recognized, the operator can pass through the through hole 36 from below the swivel frame 31. The work of connecting the hydraulic tube 45 to the swivel joint 50 can be easily performed while visually confirming the swivel joint 50, and the workability is improved.

  Further, since the through hole 36 corresponding to the flat portion 35b provided in the left and right positions on the rear side is formed at a position where the engine 40 can be visually recognized, the operator can visually recognize the engine 40 from below the turning frame 31. The maintenance work of the engine 40 can be easily performed and the workability is improved. Further, even when a pilot tube (not shown) connected to the operation lever 7 or the like or other electrical wiring or the like is routed above the engine 40, the support bracket 35 is provided to avoid the pilot tube or the like. Since the engine 40 placed on the flat surface portion 35b can be fastened from the lower side of the engine 40 by the fastening bolts 42, the mounting workability is improved.

  In addition to the through-hole 36 described above, the bottom plate 32 of the swivel frame 31 is removed with a space in the front-rear direction at a position outside the left and right reinforcing ribs 34 in order to reduce the weight of the swivel frame 31. A hole 38 is formed.

  FIG. 6 is a cross-sectional view showing a side cover mounting structure. As shown in FIG. 6, there is a gap for fitting the lower end edge of the left side wall 32c and the right side wall 32d and the side cover 23 in the vicinity of and inside the left side wall 32c and the right side wall 32d of the revolving frame 31. A plurality of guide portions 37 are provided.

  Specifically, the guide portion 37 is formed of a plate-like body that is long in the front-rear direction, and is integrally formed with the turning frame 31 by casting so as to stand from the bottom plate 32 of the turning frame 31. Further, four guide portions 37 are provided in the revolving frame 31 by being arranged at intervals in the front-rear direction at both left and right end positions.

  A sealing material 48 is provided in the gap between the left side wall 32c and the left guide portion 37. Then, the lower side edge of the left side cover 23 is sealed with the sealing material 48 and fitted into the gap, thereby positioning the left side cover 23 while restricting the movement of the left side cover 23 in the thickness direction. It prevents it from entering the car body.

  Similarly, a seal material 48 is provided in the gap between the right side wall 32d and the right guide portion 37. Then, the lower end edge of the right side cover 23 is sealed with a sealing material 48 and fitted into this gap, thereby positioning the right side cover 23 while restricting the movement of the right side cover 23 in the thickness direction.

  Here, since the guide portion 37 is formed of a plate-like body elongated in the front-rear direction, the contact area between the lower end edge of the side cover 23 and the guide portion 37 is widened, and the thickness direction of the side cover 23 is increased. Therefore, it is possible to reliably restrict the movement of the side cover 23 and to prevent the side cover 23 from rattling or the like.

  Further, the upper surfaces of the four guide portions 37 arranged in the front-rear direction at the left and right positions of the revolving frame 31 are formed in substantially the same plane, respectively, and a horizontal reference surface for cutting the revolving frame 31 is used. It is composed.

  Specifically, after the swivel frame 31 is integrally formed by casting, it is necessary to perform a cutting process on a portion requiring flatness such as the flat portion 35b of the support bracket 35 for mounting the engine 40. Accordingly, the revolving frame 31 is placed in an inverted state so that the upper surface of the guide portion 37 faces downward, and the corresponding portion is cut while ensuring the flatness in the horizontal direction. If so, it can be processed with high accuracy.

  In this way, by using a configuration in which the guide portion 37 for positioning the side cover 23 and the reference portion having the horizontal reference surface of the turning frame 31 are used as one member, the electric wiring and the hydraulic tube 45 are used. As a result, it is possible to secure a wide piping space for handling, improving workability. In addition, although the guide part 37 used as the reference plane of a horizontal direction was provided in four places in the turning frame 31, if it is provided in at least two places, the flatness at the time of a cutting process can be ensured. .

  A swing cylinder bracket 39 that rotatably supports the base end portion of the swing cylinder 15a is provided at a substantially central position in the front-rear direction of the left end portion of the revolving frame 31. The swing cylinder bracket 39 is formed in a pair of upper and lower sides, and the lower swing cylinder bracket 39 is erected from the bottom plate 32 of the revolving frame 31 and has an upper end projecting inward in the horizontal direction. ing. The projecting end is integrally formed on the side wall surface of the left reinforcing rib 34. Thus, the lower swing cylinder bracket 39 is provided at a position above the bottom plate 32 of the revolving frame 31 with a predetermined gap. The upper swing cylinder bracket 39 has a shape that protrudes outward in the horizontal direction from the upper end of the left reinforcing rib 34.

  The pair of upper and lower swing cylinder brackets 39 are formed with coaxial rotation holes 39a. The base end of the swing cylinder 15a is sandwiched between a pair of upper and lower swing cylinder brackets 39, and a rotation shaft (not shown) is inserted into the rotation hole 39a, so that the base end of the swing cylinder 15a rotates. It is supported so as to be rotatable around an axis.

  Here, the gap between the lower swing cylinder bracket 39 and the bottom plate 32 of the revolving frame 31 is a piping space for routing the hydraulic tube 45 connecting the hydraulic pump 43 and the control valve 44. Further, the above-described punching hole 38 for weight reduction communicates with a position corresponding to this gap in the bottom plate 32 of the revolving frame 31. As a result, when the hydraulic tube 45 is routed along the upper surface of the bottom plate 32 of the revolving frame 31, the hydraulic tube 45 is visually recognized from the through hole 38, or the hydraulic tube 45 is grasped through the through hole 38 to swing the swing cylinder bracket. It is possible to easily perform the operation of inserting the gap in the lower portion of 39.

  The rod tip of the swing cylinder 15a is connected to the swing bracket 15 through a cylinder insertion hole 29 formed in the front side wall 32a. Here, when the swing cylinder 15a is extended, the swing bracket 15 is rotated around the vertical axis 14a so as to face rightward. Further, when the swing cylinder 15a is retracted, the swing bracket 15 rotates about the vertical axis 14a so as to face leftward.

  As described above, according to the frame structure of the construction machine 1 according to the present embodiment, the horizontal reference surface of the swivel frame 31 is formed on the upper surface of the guide portion 37 for positioning the side cover 23. Therefore, as compared with the case where the guide portion 37 and the reference portion are separately provided on the revolving frame 31, it is possible to secure a wide piping space when the electric wiring and the hydraulic tube 45 are routed, thereby improving workability. Moreover, since the guide part 37 is integrally formed with the turning frame 31 by casting, parts costs and attachment costs can be reduced compared to the case where the guide part 37 is attached to the turning frame 31 as a separate member. This is advantageous for cost reduction.

  As described above, according to the present invention, the side cover can be easily positioned, and the horizontal reference surface of the swivel frame after casting can be provided so as not to interfere with the handling of the hydraulic tube or the like. Therefore, it is extremely useful and has high industrial applicability.

It is a side view which shows the structure of the construction machine which concerns on embodiment of this invention. It is a perspective view when an upper turning body is seen from diagonally rear. It is a perspective view which shows the structure of a turning frame. It is a top view which shows the structure of a turning frame. It is a top view when a revolving frame is seen from the lower part. It is sectional drawing which shows the attachment structure of a side cover.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Construction machine 23 Side cover 30 Upper revolving body 31 Revolving frame 32 Bottom plate 32c Left side wall 32d Right side wall 37 Guide part 40 Engine (equipment)
43 Hydraulic pump (equipped equipment)

Claims (2)

A frame structure of a construction machine including side covers standing on both the left and right sides of the upper swing body so as to cover the equipment mounted on the upper swing body,
A revolving frame disposed on the lower side of the upper revolving structure,
The revolving frame has left and right side walls standing from the left and right end edges of the bottom plate of the revolving frame, and a gap for fitting the left and right side walls and the lower end edge of the side cover. A plurality of guide portions standing from the bottom plate of the swivel frame are integrally formed by casting,
The frame structure of the construction machine, wherein upper surfaces of the plurality of guide portions are formed in substantially the same plane and constitute a horizontal reference surface. In claim 1,
The frame structure of a construction machine, wherein the guide portion is formed of a plate-like body that is long in the front-rear direction.

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