JP2013007235A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable inspection and tightening of a standard weight bolt even when an additional weight is attached to the rear face of a standard weight.SOLUTION: In an additional weight 20, at positions opposed to standard weight bolt insertion holes 17A, 17B and 17C installed in a standard weight 14, standard weight bolt insertion/removal holes 23A, 23B and 23C which a standard weight bolt 18 can be inserted into and removed from are provided. This enables inspection work and tightening work of the standard weight bolt 18 through the standard weight bolt insertion/removal holes 23A, 23B and 23C even when the additional weight 20 is attached to the rear face 14A of the standard weight 14, so as to increase the workability.

Description

  The present invention relates to a construction machine such as a hydraulic excavator and a hydraulic crane, and more particularly to a construction machine provided with a standard weight and an additional weight for balancing the weight with a work device.

  In general, a hydraulic excavator as a construction machine is provided with a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a front-rear side of the upper revolving body that can be raised and lowered. It is roughly constituted by a working device. The upper swing body has a swing frame that forms a support structure, and a counterweight for balancing the weight of the work device is mounted on the rear side of the swing frame.

  In this type of excavator, instead of the bucket used for excavation work, other work tools such as grapples used for dismantling work can be attached. In this way, when the work equipment is replaced with another work equipment that is heavier than the work equipment provided as standard equipment, it is added to the standard counterweight to balance the center of gravity of the excavator. The counterweight is attached. (For example, refer to Patent Document 1 and Patent Document 2).

Japanese Utility Model Publication No. 61-80854 JP 2005-307560 A

  By the way, in the hydraulic excavator according to Patent Document 1 described above, an additional weight is attached to the rear surface of the standard weight, and a screw hole is provided in the head of a mounting bolt for standard weight (standard weight bolt). Additional weights are fixed by screwing weight bolts. Further, in the hydraulic excavator according to Patent Document 2, an additional weight is attached to the rear surface of the standard weight with a bolt. In any of the conventional techniques, by attaching the additional weight to the rear surface of the standard weight, the standard weight bolt is hidden, and if the additional weight is not removed, the looseness of the standard weight bolt cannot be confirmed and tightened. Therefore, if the additional weight is not removed, the standard weight cannot be attached / detached, and there is a problem that it takes time to attach / detach the standard weight.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is a construction capable of performing inspection work and attachment / detachment work of a standard weight bolt even when an additional weight is attached to the rear surface of the standard weight. To provide a machine.

  A construction machine according to the present invention includes a self-propelled lower traveling body, an upper revolving body that is turnable on the lower traveling body, and a work device that is provided on the front side of the upper revolving body. The upper revolving structure includes a revolving frame having a support structure and a weight attaching member on the rear side, a standard weight attached to the weight attaching member using a standard weight bolt, and a working form by the working device. Accordingly, an additional weight attached to the rear surface of the standard weight using an additional weight bolt is provided.

  In order to solve the above-described problem, a feature of the configuration adopted by the invention of claim 1 is that a standard weight bolt insertion hole through which the standard weight bolt is inserted in the standard weight, and the standard weight. And an additional weight bolt fastening hole for fastening the additional weight bolt, which is arranged at a position different from the bolt insertion hole for the additional weight. The additional weight is provided at a position facing the additional weight bolt fastening hole. An additional weight bolt insertion hole through which the additional weight bolt is inserted, and a standard weight bolt insertion hole that is arranged at a position facing the standard weight bolt insertion hole and that is inserted into and removed from the standard weight bolt are provided. It is in the configuration.

  The invention according to claim 2 provides an inspection port for inspecting the equipment mounted on the revolving frame in the upper and lower intermediate portions of the standard weight, and for the standard weight provided in the standard weight. The bolt insertion hole and the additional weight bolt fastening hole are provided below the inspection port.

  According to a third aspect of the present invention, the standard weight bolt insertion holes provided in the standard weight are respectively provided at an upper left position and an upper right position spaced apart in the left and right directions, and the left and right standard One is provided below the weight bolt insertion hole, and the additional weight bolt fastening hole is located in a triangular region connecting the three standard weight bolt insertion holes, and is located at the left position and the right position. Each of them is provided with one each.

  According to a fourth aspect of the present invention, the additional weight bolt insertion hole is located on the rear surface of the additional weight and extends to an intermediate position in the thickness direction of the additional weight. The small diameter insertion hole provided through the step from the large diameter insertion hole to the front side of the additional weight, and the bolt shaft of the additional weight bolt is inserted into the small diameter insertion hole, The bolt head of the additional weight bolt is configured to be accommodated in the large-diameter insertion hole.

  According to a fifth aspect of the invention, the additional weight bolt insertion hole and the standard weight bolt insertion hole provided in the additional weight are through holes formed in the additional weight, or a part of the additional weight. This is because a notch hole is formed by notching.

  According to the first aspect of the present invention, since the additional weight is provided with the standard weight bolt insertion hole through which the standard weight bolt can be inserted and removed, even when the additional weight is mounted on the rear surface of the standard weight, The standard weight bolt can be inspected and retightened through the bolt insertion hole. Even when an additional weight is mounted on the rear surface of the standard weight, the standard weight bolt can be inserted into and removed from the weight mounting member through the standard weight bolt insertion / removal hole, and the standard weight can be attached and detached.

  According to the invention of claim 2, since the standard weight bolt insertion hole and the additional weight bolt fastening hole are provided below the inspection port of the mounted device provided in the standard weight, the inspection port is provided by the additional weight. Will not block. For this reason, even when an additional weight is attached to the standard weight, the mounted device can be inspected through the inspection port.

  According to the third aspect of the present invention, since the additional weight bolts are arranged in the triangular area connecting the standard weight bolts, the three additional weight bolts that fasten the load of the additional weight to the weight mounting member are provided. On the other hand, the load of the additional weight can be applied almost evenly, and the stability of the hydraulic excavator can be achieved.

  According to the invention of claim 4, by accommodating the head of the additional weight bolt in the large-diameter insertion hole, for example, rocks or the like can be prevented from colliding with the head of the additional weight bolt during excavation work, Additional weight bolts can be protected. Moreover, since the head of the additional weight bolt is not exposed from the rear surface of the additional weight, the appearance of the construction machine can be improved.

  According to the fifth aspect of the present invention, it is possible to perform inspection work and attachment / detachment work of the standard weight bolt and the additional weight bolt through the through hole or the cutout hole formed in the additional weight.

It is a front view showing a hydraulic excavator provided with a standard weight and an additional weight according to an embodiment of the present invention. It is a disassembled perspective view which shows a turning frame, a standard weight, and an additional weight. It is the right view which looked at the state which attached the standard weight to the revolving frame from the weight side. It is the right view which looked at the state which attached the standard weight and the additional weight to the turning frame from the weight side. It is sectional drawing which looked at the bolt for standard weights, the bolt insertion hole for standard weights, etc. from the arrow VV direction in FIG. It is sectional drawing similar to FIG. 5 which shows the attachment or detachment state of the standard weight volt | bolt. It is sectional drawing which looked at the bolt for additional weights, the bolt insertion hole for additional weights, etc. from the arrow VII-VII direction in FIG. It is a right view similar to FIG. 4 which shows the modification of the bolt insertion hole for standard weights, and the bolt insertion hole for additional weights.

  Hereinafter, as a construction machine applied to the embodiment of the present invention, a hydraulic excavator will be described as an example and described in detail with reference to FIGS.

  In FIG. 1, reference numeral 1 denotes a canopy-spec hydraulic excavator as a construction machine applied to the present embodiment. The hydraulic excavator 1 is a small excavator called a mini excavator suitable for work on a narrow work site. . The excavator 1 is provided with a lower traveling body 2 capable of self-propelling, an upper revolving body 3 provided on the lower traveling body 2 so as to be rotatable, and in front of the upper revolving body 3 and in front of the rear direction. And a work device 4 for performing excavation work of earth and sand.

  Here, the upper turning body 3 has a width dimension in the left and right directions that is substantially equal to the vehicle width of the lower traveling body 2, and is formed in a substantially circular shape when viewed from above. As a result, when the upper swing body 3 turns around the turning center on the lower traveling body 2, the excavator 1 has the rear surfaces of the standard weight 14 and the additional weight 20 described later within the vehicle width of the lower traveling body 2. It is comprised as a hydraulic excavator of the back small turning type which fits in.

  The upper swing body 3 includes a swing frame 5, a driver's seat 8, a canopy 11, an engine 12, a standard weight 14, an additional weight 20, and the like, which will be described later.

  A revolving frame 5 is a base of the upper revolving unit 3. As shown in FIG. 2, the revolving frame 5 has a flat bottom plate 5A extending in the front and rear directions in the left and right intermediate portions, and is spaced apart in the left and right directions on the upper surface side of the bottom plate 5A. The left vertical plate 5B and the right vertical plate 5C erected in a V-shape, the support bracket 5D that is provided at the front end of each vertical plate 5B, 5C and supports the working device 4, and for example, a pipe material or the like is curved. As a result, the left side frame 5E, the right side frame 5F, and the like formed in an arc shape surrounding the outside of the bottom plate 5A are roughly configured.

  Reference numeral 6 denotes a weight attachment member provided on the rear end side of the revolving frame 5, and the weight attachment member 6 is provided with a standard weight 14 described later. Here, the weight attaching member 6 is formed of a thick rectangular flat plate extending in the left and right directions, and is fixed to the bottom plate 5A on the rear end side of the revolving frame 5 by welding or the like. The weight mounting member 6 is provided with three bolt insertion holes 6A, 6B, 6C facing the standard weight bolt insertion holes 17A, 17B, 17C, which will be described later, penetrating in the front and rear directions. Further, three nuts 7 are welded on the front surface 6D side of the weight mounting member 6 coaxially with the bolt insertion holes 6A, 6B, 6C (see FIG. 5).

  Reference numeral 8 denotes a driver's seat disposed in the center of the turning frame 5, and the driver's seat 8 is seated by an operator. A traveling lever / pedal 9 operated by an operator is arranged on the front side of the driver's seat 8, and a working lever 10 operated by the operator is arranged on both the left and right sides of the driver's seat 8. The upper side of the driver's seat 8 is covered with a canopy 11.

  An engine 12 (see FIG. 1) is mounted on the rear side of the revolving frame 5 and is located on the front side of a standard weight 14 to be described later. The engine 12 is configured as a diesel engine, and the revolving frame 5 It is mounted in a horizontal position extending left and right. Reference numeral 13 denotes a hydraulic pump attached to the left side of the engine 12. The hydraulic pump 13 is driven by the engine 12 to hydraulically use hydraulic oil stored in a hydraulic oil tank (not shown) as pressure oil. It discharges to the hydraulic actuator mounted on the shovel 1.

  Next, the standard weight and the additional weight used in this embodiment will be described.

  Reference numeral 14 denotes a standard weight located on the rear side of the revolving frame 5 and located on the rear side of the engine 12 or the like. The standard weight 14 is a casting formed by casting, and balances the weight with the working device 4. Here, the rear surface 14A of the standard weight 14 is formed to be curved in an arc shape so that the left and right central portions protrude rearward.

  Further, the standard weight 14 includes a thin intermediate weight portion 14B positioned at an intermediate portion in the upward and downward directions, a thick upper weight portion 14C positioned above the intermediate weight portion 14B, and a lower side of the intermediate weight portion 14B. And a thick lower-side weight portion 14D, and a rectangular inspection port 15 is provided at the center in the left and right directions of the intermediate weight portion 14B. The inspection port 15 is opened and closed by an opening / closing cover 16 shown in FIG. 1, and an operator performs maintenance and inspection work on the mounted equipment such as the engine 12 and the hydraulic pump 13 through the inspection port 15. .

  Reference numerals 17A, 17B, and 17C denote three standard weight bolt insertion holes provided in the lower weight portion 14D of the standard weight 14 that are located below the inspection port 15, and each of these standard weight bolt insertion holes. The holes 17A, 17B, and 17C are through which standard weight bolts 18 described later are inserted. Here, the standard weight bolt insertion holes 17A and 17B are provided one by one in the upper left position and the upper right position of the lower weight portion 14D, separated from each other in the left and right directions, and the standard weight bolt insertion holes 17C. Is provided in the middle of the left and right standard weight bolt insertion holes 17A, 17B and below the standard weight bolt insertion holes 17A, 17B.

  That is, as shown in FIG. 3, the standard weight bolt insertion holes 17A, 17B, and 17C are arranged at the apexes of triangles that are convex downward, and bolts for additional weight bolts, which will be described later, are placed in the triangular region S. Holes 19A and 19B are provided.

  Here, as shown in FIG. 5, the standard weight bolt insertion hole 17 </ b> C extends from the rear surface 14 </ b> A of the standard weight 14 to an intermediate position in the thickness direction, and has a large diameter insertion hole 17 </ b> C <b> 2 whose bottom portion is a stepped portion 17 </ b> C <b> 1. The small-diameter insertion hole 17C3 penetrates from the step 17C1 to the front side of the standard weight 14. The standard weight bolt insertion holes 17A and 17B have the same configuration as the standard weight bolt insertion holes 17C. Then, the standard weight bolt 18 is inserted into the standard weight bolt insertion holes 17A, 17B, and 17C, and is inserted into the bolt insertion holes 6A, 6B, and 6C of the weight mounting member 6 and screwed to the nut 7. Thus, the standard weight 14 is fastened to the weight mounting member 6 using the three standard weight bolts 18. In this case, as shown in FIG. 5, the bolt shaft 18A of the standard weight bolt 18 is inserted into the small diameter insertion hole 17C3 of the standard weight bolt insertion hole 17C, and the bolt head 18B of the standard weight bolt 18 is The weight bolt insertion hole 17C is accommodated in the large-diameter insertion hole 17C2 in contact with the stepped portion 17C1 of the weight bolt insertion hole 17C. Similarly, the other two standard weight bolts 18 are also inserted into the standard weight bolt insertion holes 17A and 17B.

  Reference numerals 19A and 19B denote two additional weight bolt fastening holes which are located below the inspection port 15 and provided in the lower weight portion 14D of the standard weight 14, and each of these additional weight bolt fastening holes. 19A and 19B are bolts to which additional weight bolts 22 described later are fastened. Here, one additional weight bolt fastening hole 19A is provided at a left position in a triangular area S having three standard weight bolt insertion holes 17A, 17B, 17C as apexes, and the other additional bolt fastening hole 19A is provided. One weight bolt fastening hole 19B is provided at the right position in the triangular region S described above.

  Here, as shown in FIG. 7, the additional weight bolt fastening hole 19 </ b> B includes a hollow portion 19 </ b> B <b> 1 that is recessed in a forward shape from the rear surface 14 </ b> A of the standard weight 14, and a female screw threaded on the inner peripheral side. It is comprised by the screw seat 19B2 cast by the front side of part 19B1. On the other hand, the additional weight bolt fastening hole 19A is configured in the same manner.

  Reference numeral 20 denotes an additional weight that is detachably attached to the standard weight 14. The additional weight 20 is additionally attached to the standard weight 14 according to the work mode by the work device 4 such as when performing a dismantling work using a grapple instead of excavation work using a bucket. Here, the additional weight 20 is formed of a casting integrally formed by casting, and is formed to be curved in an arc shape so as to contact the rear surface 14A of the standard weight 14. The additional weight 20 is attached to the lower weight portion 14 </ b> D of the standard weight 14 using an additional weight bolt 22 described later, and is disposed below the inspection port 15. Accordingly, the position of the center of gravity of the upper swing body 3 can be lowered, and the stability of the excavator 1 can be improved.

  Reference numerals 21 </ b> A and 21 </ b> B denote two additional weight bolt insertion holes provided in the additional weight 20. These additional weight bolt insertion holes 21A, 21B are arranged at positions corresponding to the respective additional weight bolt fastening holes 19A, 19B of the standard weight 14. Here, as shown in FIG. 7, one additional weight bolt insertion hole 21B extends from the rear surface 20A of the additional weight 20 to an intermediate position in the thickness direction, and has a large diameter insertion hole 21B2 whose bottom is a stepped portion 21B1. And a small-diameter insertion hole 21B3 penetrating from the step portion 21B1 to the front side of the additional weight 20. The other additional weight bolt insertion hole 21A is also configured in the same manner.

  Then, the additional weight bolt 22 is inserted into the additional weight bolt insertion holes 21A and 21B and screwed into the additional weight bolt fastening holes 19A and 19B provided in the standard weight 14. Thus, the additional weight 20 is fastened to the lower weight portion 14D of the standard weight 14 using the two additional weight bolts 22. In this case, as shown in FIG. 7, the bolt shaft 22A of the additional weight bolt 22 is inserted into the small diameter insertion hole 21B3 of the additional weight bolt insertion hole 21B, and the bolt head 22B of the additional weight bolt 22 is added. The weight bolt insertion hole 21B is accommodated in the large-diameter insertion hole 21B2 in contact with the step 21B1 of the weight bolt insertion hole 21B. Similarly, the other additional weight bolt 22 is also inserted into the additional weight bolt insertion hole 21A.

  Next, 23A, 23B, and 23C indicate three standard weight bolt insertion holes provided in the additional weight 20. These standard weight bolt insertion holes 23A, 23B, and 23C are disposed so as to be substantially coaxial with each of the standard weight bolt insertion holes 17A, 17B, and 17C provided in the standard weight 14. ing. Here, as shown in FIG. 6, for example, as shown in FIG. 6, the socket portions 24A of a tool 24 such as a socket wrench used for tightening the standard weight bolts 18 are loosely inserted into the standard weight bolt insertion holes 23A, 23B, 23C. It has a hole diameter and penetrates in the thickness direction of the additional weight 20.

  As a result, even when the additional weight 20 is attached to the rear surface 14A of the standard weight 14, each standard weight bolt 18 for fastening the standard weight 14 to the weight mounting member 6 is connected to each standard weight from the rear surface 20A side of the additional weight 20. It is possible to visually inspect through the bolt insertion holes 23A, 23B, and 23C and check for looseness of each standard weight bolt 18 or the like.

  As shown in FIG. 6, the hole diameter of each standard weight bolt insertion hole 23 </ b> A, 23 </ b> B, 23 </ b> C is formed larger than the socket portion 24 </ b> A of the tool 24 used for tightening the standard weight bolt 18. Therefore, by inserting the tool 24 into each standard weight bolt insertion hole 23A, 23B, 23C, the standard weight bolt 18 is tightened with the tool 24 while the additional weight 20 is attached to the standard weight 14, and the standard weight The weight bolt 18 can be inserted and removed.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. Next, an operation when the excavator is operated by operating the hydraulic excavator will be described.

  First, the operator can drive the crawler of the lower traveling body 2 to move the hydraulic excavator 1 forward or backward by operating the traveling lever / pedal 9 while sitting on the driver's seat 8. In addition, the operator can perform the excavation work of earth and sand by operating the work lever 10 to raise and lower the work device 4.

  According to the present embodiment, the additional weight 20 can be attached to the standard weight 14 in order to ensure the stability of the main body of the excavator 1 when various attachments are attached to the work device 4. Here, when the additional weight 20 is attached to the standard weight 14, the front surface of the additional weight 20 is brought into contact with the rear surface 14A of the standard weight 14 (lower weight portion 14D), and two pieces formed in the additional weight 20 are formed. The additional weight bolts 22 are inserted into the additional weight bolt insertion holes 21A and 21B, respectively. Then, the additional weight bolt 22 inserted into the additional weight bolt insertion hole 21A is screwed into the additional weight bolt fastening hole 19A of the standard weight 14, and the additional weight bolt inserted into the additional weight bolt insertion hole 21B. The bolt 22 is screwed into the additional weight bolt fastening hole 19 </ b> B of the standard weight 14. As a result, the additional weight 20 can be attached to the rear surface 14A of the standard weight 14 below the inspection port 15 provided in the standard weight 14.

  At this time, standard weight bolt insertion holes 23A, 23B, and 23C are formed in the additional weight 20 at positions facing the standard weight bolt insertion holes 17A, 17B, and 17C, respectively. For this reason, each standard weight bolt 18 for fastening the standard weight 14 to the weight mounting member 6 is visually observed from the rear surface 20A side of the additional weight 20 through each standard weight bolt insertion hole 23A, 23B, 23C. The looseness of the bolt 18 can be inspected.

  Further, by inserting the tool 24 into each standard weight bolt insertion hole 23A, 23B, 23C, the standard weight bolt 18 is retightened with the tool 24 while the additional weight 20 is attached to the standard weight 14. The workability can be improved. On the other hand, as shown in FIG. 6, the standard weight bolt 18 can be inserted and removed by the tool 24 inserted into each standard weight bolt insertion hole 23A, 23B, 23C. These standard weights 14 and additional weights 20 can be attached to and detached from the weight attaching member 6 provided on the revolving frame 5 together with the fastening of, thereby improving the workability.

  Moreover, according to the present embodiment, the standard weight bolt insertion holes 17A, 17B, 17C and the additional weight bolt fastening holes 19A are provided in the lower weight portion 14D below the inspection port 15 in the standard weight 14. , 19B, the additional weight 20 can be fixed below the inspection port 15. Further, even if the additional weight 20 is attached, the inspection port 15 is not blocked, and by opening the opening / closing cover 16 as shown in FIG. Further, by attaching the additional weight 20 to the lower weight portion 14D of the standard weight 14, the position of the center of gravity of the upper swing body 3 can be lowered, and the stability of the excavator 1 can be achieved. In the present embodiment, the two additional weight bolt fastening holes 19A, 19B provided in the standard weight 14 are connected to the three standard weight bolt insertion holes 17A, 17B, 17C. The left and right sides are spaced apart. As a result, the additional weight 20 is applied to the three standard weight bolts 18 that fasten the load of the additional weight 20 to the weight mounting member 6 while being screwed into the additional weight bolt fastening holes 19A and 19B. The load can be applied almost evenly, and the stability of the hydraulic excavator 1 can be achieved.

  Further, according to the present embodiment, with the additional weight 20 attached to the rear surface 14A of the standard weight 14 using the additional weight bolt 22, the additional weight bolt insertion hole 21B is large as shown in FIG. The bolt head 22B of the additional weight bolt 22 can be accommodated in the diameter insertion hole portion 21B2, and similarly, the bolt head of the additional weight bolt 22 in the large diameter insertion hole portion of the additional weight bolt insertion hole 21A. 22B can be accommodated. For this reason, it is possible to prevent the bolt head 22B of the additional weight bolt 22 from protruding from the rear surface 20A of the additional weight 20. As a result, it is possible to protect the additional weight bolt 22 and enhance the appearance of the additional weight 20.

  In addition, the case where the additional weight bolt insertion holes 21A and 21B and the standard weight bolt insertion holes 23A, 23B, and 23C are formed by through holes formed in the additional weight 20 is illustrated. However, the present invention is not limited to this. For example, as in the modification shown in FIG. 8, an additional weight composed of a notch hole formed by notching a groove shape upward from the lower end of the additional weight 20. The bolt insertion holes 21A ′ and 21B ′ for standard use and the bolt insertion holes 23A ′, 23B ′ and 23C ′ for standard weights may be used.

  Furthermore, in the embodiment, the crawler type hydraulic excavator 1 has been described as an example of the construction machine. However, the present invention is not limited to this, and can be widely applied to other construction machines in which an additional weight is attached to the rear surface of a standard weight such as a wheel-type hydraulic excavator.

1 Excavator (construction machine)
2 Lower traveling body 3 Upper revolving body 4 Working device 5 Revolving frame 6 Weight mounting member 12 Engine (equipped equipment)
13 Hydraulic pump (equipped equipment)
14 Standard weight 14A Rear surface 15 Inspection port 17A, 17B, 17C Standard weight bolt insertion hole 18 Standard weight bolt 18A, 22A Bolt shaft 18B, 22B Bolt head 19A, 19B Additional weight bolt fastening hole 20 Additional weight 20A Rear surface 21A , 21B, 21A ′, 21B ′ Additional weight bolt insertion hole 21B1 Stepped portion 21B2 Large diameter insertion hole portion 21B3 Small diameter insertion hole portion 22 Additional weight bolt 23A, 23B, 23C, 23A ′, 23B ′, 23C ′ For standard weight Bolt insertion hole

Claims (5)

A self-propelled lower traveling body, an upper revolving body that is turnable on the lower traveling body, and a work device that is provided on the front side of the upper revolving body,
The upper swing body includes a swing frame having a support structure and a weight attachment member on the rear side, a standard weight attached to the weight attachment member using a standard weight bolt, and a work form according to the work device. A construction machine comprising an additional weight attached to the rear surface of the standard weight using an additional weight bolt,
The standard weight includes a standard weight bolt insertion hole through which the standard weight bolt is inserted, and an additional weight bolt that is disposed at a position different from the standard weight bolt insertion hole and fastens the additional weight bolt. With fastening holes,
The additional weight is disposed at a position facing the additional weight bolt fastening hole and is positioned at a position facing the additional weight bolt insertion hole through which the additional weight bolt is inserted, and the standard weight bolt insertion hole. A construction machine comprising a standard weight bolt insertion / removal hole arranged and inserted / removed from / to the standard weight bolt.   An inspection port for inspecting the equipment mounted on the revolving frame is provided in the upper and lower intermediate portions of the standard weight, and the standard weight bolt insertion hole provided in the standard weight and the additional weight The construction machine according to claim 1, wherein the bolt fastening hole is configured to be provided below the inspection port. The standard weight bolt insertion holes provided in the standard weight are respectively provided at the upper left position and the upper right position separated in the left and right directions, and between the left and right standard weight bolt insertion holes. One on the underside,
The additional weight bolt fastening hole is located in a triangular region connecting the three standard weight bolt insertion holes, and is provided at a left position and a right position, respectively. The construction machine described.   The additional weight bolt insertion hole is located on the rear surface of the additional weight and extends to an intermediate position in the thickness direction of the additional weight. A small-diameter insertion hole provided through the step from the step to the front side of the additional weight, and the bolt shaft of the additional weight bolt is inserted into the small-diameter insertion hole, and the bolt head of the additional weight bolt The construction machine according to claim 1, 2, or 3, wherein the construction machine is configured to be accommodated in the large-diameter insertion hole.   The additional weight bolt insertion hole and the standard weight bolt insertion hole provided in the additional weight are through holes formed in the additional weight, or are formed by notching a part of the additional weight. The construction machine according to claim 1, 2, 3, or 4, wherein the construction machine is a notch hole.

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