JP2008273410A - Cab structure and construction machine with it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cab structure capable of simplifying welding operations and checking steps of a welding part while securing sufficient cab rigidity, and a construction machine with it. <P>SOLUTION: A cab 20 is mounted in a bulldozer 10, and comprises a plurality of columns 23a-23d and a plurality of beam members 21b-21e jointed with each other. The columns and the beam members are jointed while forming a step part d displaced by a predetermined volume, and a patch 32 is adhered to include the step part d. The columns, the beam members and the patches 32 are jointed by forming a fillet welding part W at a jointed portion of each of members. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cab structure mounted on a construction machine such as a wheel loader, a bulldozer, or a hydraulic excavator, and a construction machine including the cab structure.

In recent years, construction machines such as wheel loaders, bulldozers, and hydraulic excavators are equipped with cabs (operating rooms) configured by combining square steel pipes, deformed steel pipes, and the like.
For example, in Patent Document 1, in the operator cab formed in a hexagonal frustum shape, the left and right props on the forefront are tilted forward from the top to the middle, and tilted backward at an interval that is sequentially enlarged from the middle to the bottom. Thus, a cab structure is disclosed in which enlarged front viewing areas are formed on the left and right door sides by operator eyepoints.

In this cab structure, the visibility in the blade direction, which is the front working machine, is prevented from being blocked by the support pillars, and the visibility at both ends of the blade is improved.
Japanese Patent Laid-Open No. 5-106240 (published on April 27, 1993)

However, the conventional cab structure has the following problems.
That is, in the cab structure disclosed in the above publication, in order to sufficiently secure the cab rigidity, when a cab is configured by joining a plurality of column members having substantially the same cross section and a beam member, If the part that joins the member and the beam member is joined using flare welding or groove welding, the strength of the welded part cannot be secured sufficiently, and the welding process and the inspection process of the welded part may be complicated. is there.

  An object of the present invention is to provide a cab structure capable of simplifying a welding operation and an inspection process of a welded part and a construction machine including the cab structure while sufficiently securing a cab rigidity.

  A cab structure according to a first invention is a cab structure of a construction machine configured by joining a plurality of column members and beam members, and includes a plurality of column members, a plurality of beam members, a joining member, A fillet weld. The plurality of column members are arranged along a substantially vertical direction. The plurality of beam members are brought into contact with the column member while being shifted by a predetermined amount to connect the vicinity of the upper end portions of the plurality of column members. The joining member is affixed across the column member and the beam member so as to include a step portion formed at a portion where the column member and the beam member, each of which is a hollow pipe material, are displaced and joined. . The fillet weld is formed for joining between the joining member and the column member, and between the joining member, the column member, and the beam member.

  Here, in a cab structure configured by combining a plurality of pillar members and beam members, at least one of the pillar members and the beam member, which is a hollow pipe material, is joined while being shifted, and the stepped portion of the shifted joint portion Bonding members are affixed to the column members and the beam members so as to include Then, fillet welding is performed on a surface where the joining member intersects with the column member and the beam member.

  Accordingly, the column member and the beam member are deliberately shifted and joined, and a joining member such as a patch is pasted so as to include a step of the joining portion, so that the fillet between the joining member, the column member, and the beam member is obtained. A weld can be formed. As a result, fillet welding can be used to weld the joint between the column member and the beam member, so the strength of the joint is higher than when other welding methods such as flare welding or groove welding are employed. It is possible to simplify the welding operation of the welding robot and the like and to simplify the inspection process of the welded portion while ensuring the above.

The cab structure according to the second invention is the cab structure according to the first invention, wherein the column member and the beam member have substantially the same cross-sectional shape.
Here, the column member and the beam member to be joined to each other are constituted by members having substantially the same cross section.

  As a result, the column member and the beam member having substantially the same cross section have substantially the same strength. For example, when a ROPS (Roll-Over Protective Structure) structure is configured, the strength is uniform as a whole. A cab having can be configured.

  And even when a cab is configured using a column member and a beam member having such substantially the same cross-sectional shape, the closed section for fillet welding can be easily formed by deliberately joining at the joint portion. Can be formed. As a result, the rigidity of the cab can be improved by securing the strength of the welded portion by fillet welding while sufficiently securing the rigidity of the cab with substantially the same cross-sectional shape.

A cab structure according to a third aspect is the cab structure according to the first or second aspect, wherein the beam member is joined in a state where both end portions are in contact with the side surface of the column member.
Here, the cab is configured so that the end of the beam member is brought into contact with the side surface of the column member at a portion where the column member and the beam member are joined.

  Thereby, for example, after a beam member is assembled to form a ceiling member or a floor member, the cab can be configured such that the column member is fitted from the side of the cab. As a result, since the welding of the joint portion between the column member and the beam member can be performed from the outer peripheral side of the cab, the assembly process can be simplified.

A cab structure according to a fourth invention is the cab structure according to any one of the first to third inventions, wherein at least one of the column member and the beam member has a substantially square cross section.
Here, a member having a substantially square cross section is used for at least one of the column member and the beam member.

  Thereby, when a member having a substantially square cross section is used as the column member of the cab, it is possible to configure a cab having rigidity with respect to a load from either the front-rear direction or the left-right direction of the cab. As a result, it is possible to provide a cab in which rigidity anisotropy is eliminated while reducing the types of components.

A cab structure according to a fifth invention is the cab structure according to any one of the first to fourth inventions, wherein the stepped portion to which the joining member is attached is a hollow end surface of the column member or the beam member. Has an exposed surface.
Thereby, a fillet weld part can be formed in a joined part by sticking a joining member on a position where a hollow end face is exposed.

A cab structure according to a sixth aspect is the cab structure according to any one of the first to fifth aspects, wherein the plurality of column members are joined perpendicularly to the beam member.
Here, the plurality of column members are joined substantially perpendicularly to the beam member.

  Thereby, compared with the conventional cab structure where the space | interval of a pillar member becomes small as the upper part of a cab, a cab can be shown visually large. In addition, since the joint portion between the column member and the beam member is unified at a substantially right angle, it is possible to reduce the cost by sharing the components attached to the joint portion.

A cab structure according to a seventh invention is a cab structure according to any one of the first to sixth inventions, and a pair of column members arranged on the front side of the cab among the plurality of column members are: It is joined by a beam member formed of a plate material thinner than the other beam members.
Here, a member thinner than the other beam members is used as the beam member that connects the upper portions of the column members erected on the front left and right.

  Thereby, the protrusion amount of the beam member from a ceiling surface can be suppressed by joining a beam member so that a side surface may be aligned with the upper end part of a pillar member. As a result, an overhead space in front of the operator who has boarded the cab can be easily secured.

A cab structure according to an eighth invention is the cab structure according to the seventh invention, wherein the plate member is formed of a solid member.
Here, for the thin beam member described above, a cab is formed using a solid member.
Thereby, it is possible to minimize a decrease in strength due to being thinner than the other beam members and to avoid a decrease in the rigidity of the cab.

A construction machine according to a ninth aspect includes the cab structure according to any one of the first to eighth aspects.
Here, a construction machine equipped with a cab employing the above-described cab structure is configured.
As a result, as described above, it is possible to configure a cab capable of simplifying the welding operation and the inspection process of the welded portion while sufficiently securing the cab rigidity.

  According to the cab structure according to the present invention, it is possible to simplify the welding operation and the inspection process of the welded portion while sufficiently securing the cab rigidity.

A cab 20 employing a cab structure according to an embodiment of the present invention will be described as follows with reference to FIGS.
[Configuration of Bulldozer 10]
As shown in FIG. 1, the cab structure of a construction machine according to the present embodiment is applied to a cab 20 mounted on a bulldozer (construction machine) 10.

The bulldozer 10 includes a vehicle body 11, a traveling device 14 that rotates the crawler belt while supporting the vehicle body 11 and travels the vehicle body, and a cab 20 that is mounted on the upper portion of the vehicle body 11.
The vehicle body 11 includes an engine room 12 that houses an engine (not shown), and a power train that transmits output from the engine to the drive wheels 13. The crawler belt rotates and the bulldozer 10 travels by the rotation of the drive wheels 13 by the output from the engine.

  The cab 20 forms a driver's cab configured by combining a plurality of steel pipes and steel plates, and is disposed slightly rearward of the center portion of the vehicle body 11 in the front-rear direction. The configuration of the cab 20 and the assembling method will be described in detail later.

[Structure of cab 20]
The cab 20 is configured to include a ceiling portion 21 and a column portion 23.
(Configuration of the ceiling portion 21)
The ceiling portion 21 is a member that forms the upper portion of the cab 20, that is, the ceiling of the cab, and as shown in FIG. 3, the ceiling plate material 21a, the four beam members 21b to 21e, and the reinforcing member (rib member). 31a and the patch (joining member) 32 (refer FIG. 5) are comprised.

The ceiling plate material 21a is a substantially hexagonal member formed of a steel plate, and four beam members 21b to 21e are fixed along the substantially hexagonal four sides.
The four beam members 21b to 21e are joined to the side surfaces of the four columns 23a to 23d in a state where both end portions are in contact with each other.

  The beam member (plate material) 21d is used as a beam on the front side of the cab 20, and unlike the other beam members 21b, 21c, and 21e, the beam member (plate material) 21d has a substantially rectangular cross section that is thin in the vertical direction and is a solid plate material. It is configured. Further, as shown in FIG. 4, a bolt receiving portion 33 formed by bending a steel plate at a substantially right angle is attached to the beam member 21d and the beam member 21e opposed thereto. Thereby, the ceiling board material 21a and the beam members 21d and 21e can be easily attached using a volt | bolt.

  The beam members 21b, 21c, and 21e are rod-shaped members formed by hollow steel pipes (pipe materials), and as described above, along the four sides of the substantially hexagonal ceiling plate material 21a, the beam members 21b and the beam members 21c. The beam member 21d and the beam member 21e are attached so as to be opposite sides. Further, the three beam members 21b, 21c, and 21e are the same member having a substantially square cross-sectional shape as shown in FIG. Also, at the four corners of the square formed by the four beam members 21b to 21e (intersections between the beam members 21b to 21e), as shown in FIG. A joint space X formed together is formed. In other words, the end portions of the beam members 21b to 21e are arranged in accordance with the cross-sectional shape of the column portions 23 attached to the joining space X. A reinforcing member 31a, which is a substantially triangular plate material, is disposed at the intersection of the beam members 21b to 21e.

  The reinforcing member 31 a is a substantially triangular plate member having a predetermined thickness, and is disposed at an intersection of each beam member 21 b to 21 e and the column part 23. In this way, the rigidity of the cab 20 can be improved by connecting the beam members 21b to 21e and the column portion 23 with the reinforcing member 31a.

  The patch 32 is processed so as to bend the central portion of the substantially elliptical thin plate material, and is configured to include flat portions 32a and 32a and a bent portion 32b therebetween (FIG. 9A and FIG. 9). 9 (b)). And it arrange | positions so that it may include the level | step-difference part d of the pillars 23a-23d and the beam members 21b, 21c, and 21e which were mutually offset and mentioned later, the pillars 23a-23d and the beam members 21b, 21c, and 21e are It joins by the fillet welding mentioned later.

(Structure of the pillar part 23)
As shown in FIGS. 2, 5, and 6, the column portion 23 includes four columns (column members) 23 a to 23 d. The four pillars 23a to 23d are hollow pipe members having substantially the same square cross-sectional shape as the beam members 21b, 21c, and 21e, and are formed at the four corners of the ceiling member 21, respectively. It attaches from the side with respect to the joining space X between 21e. Thereby, the assembly process of the cab 20 is simplified, and the welding operation can be efficiently performed by performing welding from the outer peripheral portion of the cab 20.

  Further, the columns 23a to 23d are attached so as to intersect perpendicularly to the beam members 21b to 21e. Thereby, since each pillar 23a-23d can be arrange | positioned along a substantially vertical direction, the cab 20 can be shown visually large. Moreover, since the pillars 23a to 23d and the beam members 21b to 21e are joined so as to intersect perpendicularly, members having substantially the same shape can be used as the reinforcing members 31a and 31b installed at the intersecting portions. .

  In addition, in the joint space X (see FIG. 4) of the ceiling member 21 to which the pillars 23a to 23d are attached, the ends of the beam members 21b to 21e are arranged so as to match the substantially square cross section of the pillars 23a to 23d. . Accordingly, the columns 23a to 23d can be attached to the ceiling portion 21 from the side, and the columns 23a to 23d can be fitted into the joint portion in a well-fitted state. Further, since each of the pillars 23a to 23d has a substantially square cross section substantially the same as each of the beam members 22b to 22e, the cab 20 having no bias in rigidity in the front-rear direction and the left-right direction can be configured. .

<Join of pillars 23a-23d and beam members 21b-21e>
In the present embodiment, as shown in FIGS. 5 and 6, a patch 32 is used at a joint portion between the plurality of pillars 23 a to 23 d and the beam members 21 b to 21 e.
Here, taking as an example a joint portion between the pillar 23d and the beam members 21c and 21e, the advantage that the pillar 23d and the beam members 21c and 21e are shifted and the patch 32 is used is shown in FIGS. A description will be given using (b). The same applies to the joints between the other pillars 23a, 23b, 23c and the beam members 21b, 21c, 21e.

  As shown in FIGS. 7, 8 (a), and 8 (b), the column 23 d and the beam members 21 c and 21 e are joined in a state where they are shifted by a predetermined amount at each joint portion, and a step portion is formed at the joint portion. d is formed. In other words, the pillar 23d and the beam members 21c and 21e have the same substantially square cross section as described above, but are deliberately shifted to form the step portion d. ing. More specifically, as shown in FIG. 8B, the beam members 21c and 21e are joined to the column 23d while being shifted by a predetermined amount to the outer peripheral side of the cab 20. Moreover, the hollow part 34 of the beam members 21c and 21e is exposed in the junction part of the beam members 21c and 21e and the pillar 23d. And the patch 32 is affixed on the level | step-difference part d formed by this shift joining so that the hollow part 34 may be covered, respectively.

  As shown in FIG. 7 and FIG. 8B, at the joint portion between the pillar 23d and the beam member 21c, the patch 32 is stepped from the pillar 23d side so as to straddle the step d formed at the joint portion. A welded portion (fillet welded portion) W by fillet welding is formed over the beam member 21c side, and the members 23d, 21c, and 21e are joined.

  On the other hand, similarly, as shown in FIG. 7 and FIG. 8 (b), the patch 32 is connected to the column 23d side so as to straddle the step d formed at the junction as shown in FIGS. Thus, a welded portion W by fillet welding is formed across the stepped portion d and the beam member 21e side, and the members 23d, 21c, and 21e are joined.

  As shown in FIG. 7, the patch 32 is along an L-shaped weld S (see FIG. 8A) formed by a side surface portion of the patch 32 that is substantially orthogonal to the side surface of the column 23 d and the beam members 21 c and 21 e. Then, it is pasted so as to cover the hollow portion 34 at the end of the beam members 21c and 21e by fillet welding. At this time, as described above, the pillar 23d and the beam members 21c and 21e are joined while being shifted so as to form the stepped portion d. However, by joining the patch 32, the joints of the beam members 21c and 21e are connected. Fillet welds can be formed on all four sides, substantially forming a closed weld cross section.

  In this way, by performing fillet welding, the members 23d, 21c, and 21e are joined, so that the welding operation and the welded portion are inspected as compared with joining by other welding methods such as flare welding and groove welding. The process can be simplified and the strength of the welded portion can be sufficiently maintained. As a result, it is possible to easily control the welding robot while ensuring the rigidity of the entire cab 20, and to reduce the manufacturing cost of the cab.

  Further, as in the present embodiment, the members 23d, 21c, and 21e to be joined are joined by shifting by a predetermined amount, and the patch 32 is provided so as to cover the shifted stepped portion d, so that the four sides of the joined portion are provided. Fillet welding is possible, and the strength of the joint can be sufficiently secured while using the pipe material.

[Features of this cab 20]
(1)
The cab 20 of the present embodiment is mounted on the bulldozer 10 as shown in FIG. 1 and includes a plurality of pillars 23a to 23d and a plurality of beam members 21b, 21c, and 21e as shown in FIG. They are joined together. As shown in FIG. 7, the pillars 23a to 23d and the beam members 21b to 21e are joined while forming a stepped portion d shifted by a predetermined amount, and the patch 32 is attached so as to include the stepped portion d. . The pillars 23a to 23d, the beam members 21b to 21e, and the patch 32 are joined by forming a welded portion W along an L-shaped welded portion S formed at a joint portion of these members.

  As a result, the pillars 23a to 23d and the beam members 21b, 21c, and 21e are joined while being shifted, so that L-shaped welding for fillet welding is performed around the patch 32 that is attached so as to include the stepped portion d. The part S can be formed effectively. For this reason, the rigidity of the cab 20 can be improved while enjoying the advantages of fillet welding such as high welding strength and simplification of the welding operation and inspection process.

(2)
In the cab 20 of the present embodiment, as shown in FIGS. 7 and 8B, members having substantially the same cross-sectional shape are used as the pillars 23 a to 23 d and the beam members 21 b, 21 c, and 21 e that are constituent members. Yes.

  As a result, members having a difference in strength among the plurality of pillars 23a to 23d and the beam members 21b, 21c, and 21e can be eliminated as much as possible. Therefore, the cab 20 that is stable in strength when the ROPS structure or the like is formed. Obtainable.

  Further, even when the cab 20 is configured by combining members (columns 23a to 23d, beam members 21b, 21c, and 21e) having a common cross-sectional shape as described above, both the members are intentionally shifted and joined as described above. Thus, fillet welding can be easily formed.

(3)
In the cab 20 of the present embodiment, as shown in FIG. 7 and the like, a plurality of beam members 21b to 21e are joined in a state of being in contact with the side surfaces of the columns 23a to 23d.
Thereby, when configuring the cab 20, the columns 23a to 23d can be joined so as to be fitted from the side. As a result, welding work can be performed from the outer periphery side of the cab 20, and the manufacturing cost of the cab 20 can be reduced.

(4)
In the cab 20 of the present embodiment, as shown in FIGS. 4 and 7, columns 23a to 23d and beam members 21b, 21c, and 21e having a substantially square cross-sectional shape are used.
Thereby, the cab 20 having uniform rigidity can be configured in the front-rear direction and the left-right direction. As a result, the types of parts constituting the cab 20 can be reduced, and the manufacturing cost of the cab 20 can be reduced.

(5)
In the cab 20 of the present embodiment, as shown in FIGS. 4 and 7, hollow pipe materials are used as the pillars 23a to 23d and the beam members 21b, 21c, and 21e.
Thus, by configuring the hollow large cross section, the rigidity of each member can be improved, and the weight of the cab 20 can be reduced and the cost can be reduced by making each member hollow.

(6)
In the cab 20 of the present embodiment, as shown in FIGS. 5 and 6, the columns 23 a to 23 d are joined so as to vertically intersect the beam members 21 b to 21 e.
Thereby, compared with a normal cab, the cab 20 which looks visually large can be comprised. In addition, since all the intersections of the pillars 23a to 23d with respect to the beam members 21b to 21e are unified vertically, the shapes of the reinforcing members 31a and 31b and the like installed at the intersections are made common to reduce the types of parts. Can do.

(7)
In the cab 20 of the present embodiment, as shown in FIG. 5 and the like, the pillars 23a to 23d and the beam members 21b to 21e are joined using common reinforcing members 31a and 31b.
Thereby, the kind of reinforcement member 31a, 31b which comprises the cab 20 can be reduced, and the manufacturing cost of the cab 20 can be reduced.

(8)
In the cab 20 of the present embodiment, as shown in FIG. 5 and the like, a member thinner than the other beam members 21b, 21c, and 21e is used as the beam member 21d disposed in front of the cab 20.
As a result, the amount of protruding downward of the beam member 21d is reduced, so that a wide front overhead space for an operator performing a driving operation or the like in the cab 20 can be secured.

(9)
In the cab 20 of the present embodiment, as shown in FIG. 4 and the like, a solid member is used as the beam member 21d that is thinner than the other beam members 21b, 21c, and 21e.
Thereby, the strength reduction due to the thinning can be avoided, and the local decrease in rigidity in the cab 20 can be avoided.

(10)
As shown in FIG. 1, the bulldozer 10 of the present embodiment is equipped with the cab 20 described above.
Thus, as described above, by using a lot of fillet welding, it is possible to configure the cab 20 that can simplify the work and inspection process of the welded portion while sufficiently securing the rigidity of the cab 20. it can.

[Other Embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention.
(A)
In the said embodiment, the pillar 23a-23d and the beam members 21b, 21c, and 21e which comprise the cab 20 were demonstrated and demonstrated with the example using the hollow pipe material which has a substantially identical cross section. However, the present invention is not limited to this.

For example, pipe materials having similar and identical cross-sections may be used as the columns and beam members, respectively. Further, it is more effective if the beam members 21b, 21c, and 21e are the same parts having the same length.
Furthermore, a partly solid member may be used instead of the hollow pipe material.

  However, by configuring the cab using columns and beams having a hollow large cross section, it is possible to improve the rigidity of the cab while avoiding a decrease in local rigidity, and to reduce the weight of the cab. It is more preferable to use a hollow pipe member having substantially the same cross section as in the above embodiment.

(B)
In the said embodiment, the pillar 23a-23d and the beam members 21b, 21c, and 21e which comprise the cab 20 were demonstrated and mentioned as the example using the pipe material which has a substantially square cross section. However, the present invention is not limited to this.
For example, a column or beam member having a substantially rectangular shape or a cross-sectional shape such as a polygonal shape, a circular shape, or an elliptical shape may be used.

(C)
In the embodiment described above, an example in which the patch 32 processed so as to bend a substantially elliptical thin steel plate is described as the joining member that connects the pillars 23a to 23d and the beam members 21b, 21c, and 21e. However, the present invention is not limited to this.
For example, a member obtained by processing a metal block so as to be attached along the stepped portion may be used as the joining member.

(D)
In the said embodiment, the some pillar 23a-23d was given and demonstrated as the example arrange | positioned along the perpendicular direction. However, the present invention is not limited to this.
For example, it is also possible to apply the present invention to a cab constituted by column members arranged so that the upper part of the cab becomes thin as seen in a conventional cab.

(E)
In the above embodiment, an example in which the present invention is applied to the structure of the cab 20 mounted on the bulldozer 10 has been described. However, the present invention is not limited to this.
For example, as a construction machine in which the cab structure according to the present invention is adopted, the present invention can be applied to a cab mounted on a construction machine such as a wheel loader or a hydraulic excavator in addition to a bulldozer.

  The cab structure of the present invention has the effect of simplifying the welding operation and simplifying the inspection process of the welded portion while ensuring sufficient rigidity of the cab, so that a plurality of column members and beam members are combined. The present invention can be widely applied to various construction machines equipped with a cab configured as described above.

1 is a perspective view showing an overall configuration of a bulldozer equipped with a cab structure according to an embodiment of the present invention. The perspective view which shows the structure of the cab mounted in the bulldozer of FIG. The disassembled perspective view which shows the structure of the ceiling part which comprises the ceiling part of the cab of FIG. The perspective view which shows the structure at the time of combining the beam member contained in the ceiling part of FIG. The front side perspective view which shows the framework structure of the cab of FIG. The rear side perspective view which shows the framework structure of the cab of FIG. The elements on larger scale which show the structure of the junction part of cabs, such as FIG. (A), (b) is the side view and top view which show the junction part of FIG. (A), (b) is the top view and side view which show the structure of the patch used for the junction part of FIG.

Explanation of symbols

10 Bulldozer (construction machine)
11 Car body 12 Engine room 13 Driving device 14 Traveling device 20 Cab (cab structure)
21 Ceiling part 21a Ceiling board material 21b Beam member (beam member)
21c Beam member (beam member)
21d Beam member (plate material)
21e Beam member (beam member)
21f Reinforcement beam member 23 Column part 23a-23d Column (column member)
31a-31c Reinforcing member (rib member)
32 Patch (joining member)
32a Plane portion 32b Bending portion 33 Bolt receiving portion 34 Hollow portion d Stepped portion S L-shaped welded portion W Welded portion (fillet welded portion)
X joint space

Claims (9)

A cab structure for a construction machine configured by joining a plurality of column members and beam members,
A plurality of the pillar members arranged along a substantially vertical direction;
The beam member that is abutted by a predetermined amount with respect to the column member and connects the vicinity of the upper end portions of the plurality of column members;
At least one of them is a pipe member that is a hollow pipe member, and is pasted across the column member and the beam member so as to include a stepped portion formed at a portion where the column member and the beam member are displaced and joined. Joining members,
Fillet welds formed for joining between the joining member and the column member, and between the joining member and the column member and the beam member;
The cab structure is equipped with. The column member and the beam member have substantially the same cross-sectional shape,
The cab structure according to claim 1. The beam member is joined in a state where both end portions are in contact with the side surface of the column member,
The cab structure according to claim 1 or 2. At least one of the column member and the beam member has a substantially square cross section,
The cab structure according to any one of claims 1 to 3. The step portion to which the joining member is attached has a surface from which a hollow end surface of the column member or the beam member is exposed.
The cab structure according to any one of claims 1 to 4. The plurality of column members are joined perpendicularly to the beam member,
The cab structure according to any one of claims 1 to 5. Of the plurality of column members, the pair of column members arranged on the front side of the cab are joined by a beam member formed of a plate material thinner than the other beam members.
The cab structure according to any one of claims 1 to 6. The plate is formed of a solid member,
The cab structure according to claim 7. A construction machine comprising the cab structure according to any one of claims 1 to 8.

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