JP4041332B2 - Counterweight and counterweight manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a counterweight and a counter provided at the rear part of a vehicle body of a construction machine such as a hydraulic excavator, a self loader, a bulldozer, a wheel loader, a crawler loader, an agricultural machine, a work machine or the like (hereinafter simply referred to as a construction machine). The present invention relates to a weight manufacturing method.
[0002]
[Prior art]
Among the construction machines, agricultural machines, work machines, etc., for example, the construction machines such as hydraulic excavators, self loaders, bulldozers, wheel loaders, crawler loaders, etc. are well known in mountainous dams, tunnels, rivers, roads. It is used for excavation of rocks, etc. and demolition of buildings and buildings.
[0003]
The structure of the construction machine is, for example, in a hydraulic excavator, as shown in FIGS. 8 and 9, a lower traveling body 1, an upper revolving body 2 that is disposed on the upper side of the lower traveling body 1, and an upper revolving body. It consists of three parts with the working device 4 that is provided in the body 2 and performs various operations.
The upper swing body 2 includes an engine 6, a hydraulic device, a swing device, an operator chamber 10 and the like in addition to the above-described working device 4, and a side cover 2sc that covers the outer peripheral side of the upper swing body 2; The upper revolving unit 2 includes an upper cover 2uc that covers the upper outer periphery of the upper swing body 2, an engine hood 12, and the like.
[0004]
The lower traveling body 1 includes a car body, a track roller frame, a traveling device, and a foot suspension device (not shown), and the working device 4 further includes a boom 16 for supporting the bucket 15 as shown in FIG. The arm 18 is composed of various hydraulic cylinders and link rods that actuate the arm 18, and is composed of the above-described turning device, traveling device, and the like.
[0005]
Further, as shown in FIG. 9, between the counterweight 14 provided at the rear portion of the hydraulic excavator and the operator chamber 10, an engine 6 having a hydraulic pump 16 connected to the front side of the counterweight 14 is disposed horizontally. A radiator 18 and an oil cooler 22 are provided on the front side of the engine 6, and a cooling fan 20 driven by any one of driving means 19 for the engine 6, the hydraulic motor, and the electric motor that cools the radiator 18 and the oil cooler 22. Are connected and are driven by the engine 6 in this embodiment.
[0006]
The counterweight 14 is arranged to balance, for example, the weight of the hydraulic excavator working device 4 suspended, the working force, the weight distribution of the vehicle, and the like. In this case, since the distance from the turning center 21 to the rear end of the upper swing body 2 is shortened, if the heavy counterweight 14 is not mounted with a small volume corresponding to the shortened distance, the overall weight balance will be increased. It becomes impossible to take.
[0007]
On the other hand, the counterweight 14 includes a press type and a casting type.
The press type counterweight 14 is lighter in weight than the cast type counterweight.
That is, the press-type counterweight 14 is covered with a bag-like sheet constituting the shape of the press-type counterweight 14, and filled with sand iron, iron scrap, ready-mixed concrete (or mortar) and solidified to form a skeleton. Since the formed and press-formed sheet metal is attached to the back of the skeleton by welding, the specific gravity of the press-type counterweight 14 can be about 5-6.
[0008]
However, when making a counterweight having a higher weight with the material having the specific gravity of about 5 to 6 (sand iron, iron scrap, ready-mixed concrete), the counterweight with an increased total volume has to be made.
For example, if it is a normal type and a press type counterweight having the same volume of 3.5 to 4 tons, a cast type counterweight having a weight of 6 to 6.5 tons can be obtained.
[0009]
Japanese Patent Laid-Open No. 2000-302376 is known as a technique for improving the problems of the press type counterweight (which is inexpensive but cannot produce a high specific gravity counterweight). The slab materials that come out are stacked in the vertical direction and the entire outer periphery of the joint surface is welded. For example, when the appearance of the rear surface side of the counterweight is required, a press-molded press sheet (outer surface member) is attached, In addition, in order to prevent dents from occurring during collision and to increase the weight of the counterweight, conventionally used fillers mixed with iron powder, cement, water, etc. are combined with the slab material. It is filled between the press sheets.
[0010]
[Problems to be solved by the invention]
However, the counterweight composed of the slab material and the press sheet is a fluid before solidifying when the filler is filled, and is completely in order to prevent leakage of water, mortar, iron powder and the like. However, when the slab material is overlapped in the vertical direction, it must be welded without gaps so that it is completely sealed, which increases the cost of welding the entire outer periphery. It will be.
[0011]
Further, the skeleton formed by filling and solidifying sand iron, iron scrap, ready-mixed concrete (or mortar) of the press-type counterweight, and the filler filled between the slab material (block) and the press sheet, When recycling the counterweight, it is not easy to peel off and separate the iron and cement, which is expensive.
In addition, the skeleton and the filler filled with sand iron, iron scrap, and ready-mixed concrete (or mortar) and the filler have a specific gravity smaller than that of the slab material or cast material, and thus constitute a counterweight having the same weight. However, the overall shape of the counterweight is larger than that of a slab material or a cast material, which is disadvantageous for a small turning type construction machine.
[0012]
However, in the case of the all-cast type counterweight 14, since the casting has a specific gravity of 7 to 7.1, the counterweight 14 can be made small and heavy, but compared to the press-type counterweight 14, For example, it costs about 2 to 3 times and is expensive.
That is, in the case of the all-cast type counterweight 14, since the external shape of the counterweight 14 differs depending on the type of the hydraulic excavator, such as large, medium, small, and ultra-small turning machines, Each time it is necessary to make a mold again, there is a drawback that the above-mentioned mold is expensive to manufacture.
[0013]
In addition, if several types of press dies for press sheet outer surface members disposed on the outer surface of the skeleton of the counterweight are produced, the press dies will be costly when producing a small amount of various types of the counterweight. .
The present invention has been devised in view of such a problem, and comprises a skeleton of a counterweight by combining a plurality of blocks made of heavy objects, and an outer surface of at least a part of the skeleton is a cast outer surface. By constructing the counterweight by covering it with the material, the above counterweights with different weights can be easily made, and it has both freedom, versatility, and high recyclability at the time of manufacture, and is small and low in weight and cost. It is an object to provide a counter weight and a counter weight manufacturing method.
[0014]
[Means for Solving the Problems]
  For this reason, the counterweight according to the first aspect of the present invention has a plurality of heavy blocks arranged in the vertical direction.UnevenA skeleton of a counterweight configured to be coupled in a step-like manner, and a cast outer surface member attached to the skeleton so as to cover at least a part of the outer surface of the skeleton. Filling a space formed between the outer surface of the skeleton and the outer surface member made of casting, and having a protruding portion protruding toward the skeleton so as to fit with the outer surface of the skeleton, the outer surface made of casting The projecting part of the member and the skeleton are boltsDirectlyIt is characterized by being connected.
[0015]
A counterweight according to a second aspect of the present invention is characterized in that, in the configuration according to the first aspect, the block made of the plurality of heavy objects is made of a slab material.
A counterweight according to a third aspect of the present invention is characterized in that, in the configuration according to the first or second aspect, the skeleton has a coupling means for coupling the blocks made of the plurality of heavy objects.
[0016]
  ContractClaim4The counterweight of the present invention described in claim1 to 3In the configuration described above, the outer surface member made of casting is configured to cover at least one of the rear surface side and the side surface side of the counterweight.
[0019]
  According to a fifth aspect of the present invention, there is provided a counterweight manufacturing method in which a block made of a plurality of heavy objects is vertically moved.UnevenA skeleton constituting step of forming a skeleton of the counterweight by joining stepwise, and an outer surface member of the skeleton and the outer surface member of the casting made of the outer surface member of the skeleton having a protrusion on the outer surface of at least a part of the skeleton A covering step covering the space formed between the outer surface of the frame and the projecting portion of the cast outer surface member and the frame with a bolt.DirectlyAnd a connecting step of connecting.
  According to a sixth aspect of the present invention, there is provided the counterweight manufacturing method according to the fifth aspect, wherein the slab material for forming the block made of the plurality of heavy objects is cut into a shape set by design specifications. It is characterized by having.
[0020]
  Claim7The counterweight manufacturing method of the present invention described in claim5Or6In the configuration described,In the above skeleton construction process,The block is made as a divided block having a plurality of shapes, and the plurality of divided blocks are assembled.OnlyIn addition, the above skeleton is determined according to the design specifications.RukoIt is characterized by.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. In addition, it demonstrates with reference to FIG. 8, FIG. 9 as needed.
FIG. 1 is a schematic explanatory view showing an embodiment of the present invention, (A) is a schematic plan view of a counterweight, (B) is a schematic front view showing an arrow 1B in FIG. 1 (A), and FIG. FIG. 3 is a schematic explanatory view showing a cross-sectional view taken along line 2A-2A in FIG. 1B, FIG. 3 is a schematic plan view showing a slab material as a base material of the skeleton of the counterweight in FIG. 1A, and FIG. 4 (A) to 4 (D) show first-stage to fourth-stage slabs cut from the slab material of FIG. FIG. 5 is a schematic plan view schematically showing each of the die cutting products, and FIG. 5 is a schematic explanatory view showing the same state as FIG. 1, showing a modified example of the above embodiment, in which (A) is a counterweight. FIG. 6B is a schematic explanatory view showing an arrow 5B in FIG. 5A, and FIG. 6 is a sectional view taken along line 6A-6A in FIG. FIG. 7 is a schematic explanatory view showing a skeleton in the same state as FIG. 4, and FIGS. 7A to 7D are cut from the slab material of FIG. It is the schematic plan view which each showed typically the 1st step-the 4th step slab type | mold cutting product.
[0022]
As shown in FIGS. 1 to 3, the skeleton of the counterweight 14 of the present embodiment is a heavy object block, but in the present embodiment, a plurality of heavy object blocks 30, that is, the first block 31. The second block 32, the third block 33, and the fourth block 34 are stacked in the vertical direction, and the contact surfaces of the first to fourth blocks 31 to 34 shown in FIG. The skeleton 40 of the counterweight 14 is configured by joining 36a, 36b, 36c and the like by welding.
[0023]
Further, the coupling means 36 is not limited to the above welding, and may be fastened by screwing with a bolt or the like.
The skeleton 40 of the counterweight 14 is cut into a shape set according to the design specifications from a steel slab material S having a substantially rectangular cross section from the steel mill as shown in FIG. As shown in FIGS. 4A to 4D, the first slab die cutting product (first block) 31, the second slab die cutting product (second block) 32, and the third slab die cutting processing. After making a product (third block) 33 and a fourth slab die cutting product (fourth block) 34 and polymerizing them in the order of arrows Y1, Y2 and Y3, the first to fourth slab die cutting operations are performed as described above. The articles 31 to 34 are one of the coupling means 36, and are joined by, for example, welding to form the skeleton 40 of the counterweight 14.
[0024]
Then, as shown in FIG. 2, the outer surface 40A of at least a part of the skeleton 40 is formed on the rear surface 42a or the left and right side surfaces 42b of the construction machine on the rear side 42 of the count weight 14 in this embodiment. 37 is attached.
Further, the casting outer surface member 37 is configured so as to fill a space formed between the outer surface of the skeleton 40 and the outer surface member 37 made of the casting.
[0025]
  or,the aboveBolt cast outer surface member 37 to frame 40BTConnected by connecting means 41 consisting ofPleaseYes.
  Further, as shown in FIG. 2, the outer surface member 37 made of the casting projects toward the outer surface 40A of the skeleton 40 toward the skeleton 40 coupled in a stepwise manner in the vertical direction, and the outer surface 40A of the skeleton 40 It has the protrusion part 57 which fills the space SP between the casting-made outer surface members 37, and in the case of this embodiment, it has protrusion parts 57A-57C as shown in FIG.
[0026]
  Further, the protrusions 57A to 57C of the cast outer surface member 37 and the outer surface 40A of the skeleton 40 are arranged so as to contact as much as possible so that the space SP is reduced, and the bolt BTFromIt is connected by the connecting means 41.
  In addition, as shown in FIGS. 1A, 1B, and 2, the above-mentioned abutting against the side surface portion of the fourth block 34, the upper surface portion of the third block 33, and the protruding portion 57C of the cast outer surface member 37. As shown in FIGS. 1 (A), 1 (B), and 2, the plurality of portions 38 a to 38 c of the protrusion 57 </ b> C of the above-described structure are formed on the outer surface 40 </ b> A of the skeleton 14 and the protrusion 57 </ b> C of the casting outer surface member 37. Are detachably coupled by a bolt BT which is a coupling means 41. Further, a plurality of portions 39 a to 39 c of the lower surface portion of the first block 31, the projecting portion 57 A of the cast outer surface member 37 and the projecting portion 57 A of the cast outer surface member 37 are attached and detached by bolts BT that are connecting means 41. The counterweight 14 is configured by being coupled together.
[0027]
The protrusion 57A of the cast outer surface member 37 is fastened to the lower surface of the first block 31 on the outer surface 40A of the skeleton 40 by the bolt BT.
At least part of the space SP formed in the third block 33 and the fourth block 34 is reduced in the protrusion 57C of the outer surface member 37 made of cast metal as shown in FIGS. As described above, the projecting portion 57C is disposed so as to contact the side surface portion of the fourth block 34 and the upper surface portion of the third block 33, and is connected by the bolt BT.
[0028]
Further, the protrusion 57A of the cast outer surface member 37 is configured to overlap with the entire periphery of the lower surface along the counterweight 14 side of the first block 31, and the protrusion 57C is the counterweight 14 side of the third block 33. Although it is configured to overlap with the entire circumference of the upper surface portion 33a along, the protrusions 57A and 57C are, for example, a plurality of the portions 38a to 38c and 39a to 39c as attachment flanges. You may make it protrude and attach so that it may overlap with a part of lower surface part of the 1st block 31 of the frame 40, and a part of upper surface part of the 3rd block 33 as mentioned above.
[0029]
  orThe protruding portion 57B of the cast outer surface member 37 is disposed so as to abut against and engage with the upper surface of the first block 31, the lower surface of the third block 33, and the side surface of the second block 32.
[0030]
1A, 1B, and 2 can be formed so as to conform to the appearance design of the rear side surface 42a of the counterweight 14, so that the entire construction machine can be constructed as well as the appearance design of the counterweight 14. The appearance design can be improved.
Further, the space SP is filled with the casting outer surface member 37 without filling the gap between the outer surface 40A of the skeleton 40 and the casting outer surface member 37 with mortar, iron sand, iron scrap concrete, or the like. Therefore, the adjustment of the weight of the entire counterweight 14 can be replaced and adjusted by a plurality of types of casting outer surface members 37 prepared in advance.
[0031]
Furthermore, the swing frame of the upper swing body 2 of the hydraulic excavator shown by a two-dot chain line in the concave portions 35a and 35b provided on the left and right of the central portion of the first block 31 shown in FIG. 25a and 25b are inserted, and the lower surface of the second block 32 of the counterweight 14 is fastened to the center frames 25a and 25b with a bolt 45 or the like, and the counterweight 14 is mounted on the upper swing body 2. Yes.
[0032]
Further, in the above embodiment, the recesses 35a and 35b that open forward and downward are provided on the left and right of the central portion of the first block 31, and the rear ends of the center frames 25a and 25b of the excavator are inserted into the recesses 35a and 35b. Although the structure in which the counterweight 14 is fixed and supported by the bolt 45 is shown, the present invention is not limited to this, and for example, the modification of the embodiment shown in FIGS. 5 to 7 without the recesses 35a and 35b is provided. An example may be used, and the same parts as those in the above embodiment are denoted by the same reference numerals.
[0033]
That is, as shown in FIG. 5B, the rear portions of the center frames 25 a and 25 b are attached to the lower surface portion of the first block 31 by the bolts 45.
Further, if the extending portion 37L is provided so that the lower end of the outer surface member 37 made of the casting becomes long downward so that the center frames 25a and 25b cannot be seen from the back or side of the counterweight 14, the above-described center frame can be obtained. 25a and 25b are not visible and the appearance is not impaired.
[0034]
Further, since the center frames 25a and 25b may be attached to the lower surface of the central portion of the first block 31 with the bolts 45, the counterweight 14 can be attached and detached very easily.
Further, the skeleton 40 has been described in the case where the slab material S of substantially rectangular parallelepiped is divided into four stages of the first to fourth blocks in the vertical direction, and these are combined and superposed for bonding. For example, the skeleton 40 is further divided from the above-described embodiment, and divided blocks such as a corner portion divided block, a curved surface portion divided block, a rectangular parallelepiped portion divided block, and a concave portion divided block having a concave portion are formed. In addition, in order to make a skeleton 40 of various shapes and sizes set according to the design specifications, the divided blocks are combined in the left, right, front, back, top and bottom, and coupled by a coupling means 36 such as welding or bolt coupling. If it is configured at all, it is not necessary to make a mold each time as in the conventional example, for example, and therefore it can be manufactured promptly and inexpensively.
[0035]
Further, the divided block uses a waste product such as a battery mounted on an automobile, a work machine or the like as the divided block of the present embodiment, and appropriately uses known brackets or the like used in various structures. If the frame 40 is configured by being mounted and disposed, and the outer surface member 37 made of a casting is further used, the cost is low and it can be recycled and reused.
[0036]
Japanese Patent Laid-Open No. 2000-302376 is known as a technique for improving the problems of the press type counterweight (which is inexpensive but cannot produce a high specific gravity counterweight). Even if the counterweight 14 having the member 37 collides with an obstacle, the outer surface of the counterweight is made of cast metal, so that it is possible to reduce the loss of appearance due to the indentation.
[0037]
【The invention's effect】
  As described above in detail, according to the counterweight of the present invention described in claim 1, a block composed of a plurality of heavy objects is provided.Stepped with unevennessSince it is provided with a skeleton of a counterweight constructed by joining and a cast outer surface member attached to the skeleton so as to cover at least a part of the outer surface of the skeleton, only the outer casting surface member is replaced. Accordingly, a counterweight having a size and a shape as required can be easily and easily manufactured at a low cost, and the manufacturing flexibility is improved.
  Further, since the outer surface of the skeleton and the outer surface member made of cast metal are fitted and connected, a strong counterweight can be made.
  In addition, since the cast outer surface member is configured so as to fill a space between the outer surface of the skeleton and the cast outer surface member, there is no need to fill with a filler as in a conventional counterweight. Also, it is possible to make a heavy counterweight without having to worry about leakage of the filler.
  Moreover, since it has the protrusion part which protrudes from the said casting outer surface member toward the said frame | skeleton couple | bonded stepwise in the up-down direction, and fills the said space of the said frame | skeleton and the said casting outer surface member, it is compact and heavy. A certain counterweight can be manufactured.
  Further, the projecting portion of the cast outer surface member and the skeleton are bolted together.DirectlySince they are connected, the cast outer surface member can be easily and firmly attached to the skeleton.
[0038]
According to the counterweight of the present invention described in claim 2, in the configuration described in claim 1, the block made of the plurality of heavy objects is formed of a slab material. The counterweight can be manufactured with an inexpensive slab material.
According to the counterweight of the present invention described in claim 3, in the configuration according to claim 1 or 2, the skeleton has a coupling means for coupling the blocks made of the plurality of heavy objects. In addition to the above effect, the skeleton having a desired shape can be easily formed by appropriately combining the blocks.
[0040]
  Claim4According to the described counterweight of the present invention,Any one of 1-3In the configuration described above, the cast outer surface member is configured to cover at least one of the rear surface side and the side surface side of the counterweight.Any one of 1-3In addition to the effects of the above, it is possible to make the counterweight with good appearance at a low cost if necessary.
[0043]
  According to the counterweight manufacturing method of the present invention as set forth in claim 5, a block composed of a plurality of heavy objects is provided.Stepped with unevennessA skeleton construction step for forming a skeleton of the counterweight by bonding, a covering step for covering at least a part of the outer surface of the skeleton with the cast outer surface member, a protrusion of the cast outer surface member, and the skeleton with bolts soDirectlyAnd a connecting step for connecting, so that it can be manufactured by simply selecting and replacing a plurality of types of the above-mentioned cast outer surface members prepared in advance for a desired counterweight set according to the design specifications. At the same time, it is possible to manufacture the counterweight with a good weight balance by appropriately correcting the weight of the counterweight.
  Further, the cast outer surface member fills a space formed between the outer surface of the framework and the cast outer surface member so that the outer surface of the framework and the cast outer surface member are fitted to each other. Since the skeleton is covered, it is not necessary to fill the filler as in the conventional counterweight, and it is possible to make a heavy counterweight that does not need to worry about leakage of the filler.
  Further, the projecting portion of the cast outer surface member and the skeleton are bolted together.DirectlySince it connects, attachment of the said casting outer surface member with respect to the said frame | skeleton can be made easy and firm.
[0044]
  Claim6According to the described counterweight manufacturing method of the present invention,5In the configuration described above, since a slab material for forming the block composed of the plurality of heavy objects is provided with a die cutting step for cutting into a shape set by design specifications,5In addition to the above effects, a counterweight having a desired shape set according to design specifications can be manufactured.
  Claim7According to the described counterweight manufacturing method of the present invention,5Or6In the configuration described,In the above skeleton construction process,The block is made as a divided block having a plurality of shapes, and the plurality of divided blocks are assembled.OnlyIn addition, the above skeleton is determined according to the design specifications.RuAnd claims5Or6In addition to the effects described above, various counterweights can be manufactured by combining the divided blocks, and the degree of freedom in manufacturing can be improved.
[Brief description of the drawings]
1A and 1B are schematic explanatory views showing an embodiment of the present invention, in which FIG. 1A is a schematic plan view of a counterweight, and FIG. 1B is a schematic front view showing an arrow 1B in FIG.
FIG. 2 is a schematic explanatory diagram showing a cross-sectional view taken along line 2A-2A of FIG.
FIG. 3 is a schematic plan view showing a slab material that is a base material of the skeleton of the counterweight in FIG. 1 (A).
4 shows a die-cut product obtained by die-cutting from the slab material of FIG. 3. FIGS. 4 (A) to 4 (D) show the first die-cut processed from the slab material of FIG. It is the schematic plan view which showed typically the step-the 4th step slab type | mold cutting product, respectively.
FIGS. 5A and 5B are schematic explanatory views showing a modified example of the above embodiment and showing the same state as in FIG. 1, wherein FIG. 5A is a schematic plan view of a counterweight, and FIG. 5B is a schematic view of FIG. It is a schematic explanatory drawing which shows arrow 5B.
6 is a schematic explanatory view showing a cross-sectional view taken along line 6A-6A in FIG. 5;
7 is a schematic explanatory view showing a skeleton in a state similar to that in FIG. 4, and FIGS. 7A to 7D are first-stage to fourth-stages cut from the slab material of FIG. It is the schematic plan view which each showed the step slab type | mold cutting product typically.
FIG. 8 is a schematic explanatory view showing a perspective view of a conventional hydraulic excavator.
9 is a schematic explanatory view showing a plan view taken along line 9A-9A in FIG.
[Explanation of symbols]
1 Lower traveling body
2 Upper swing body
2sc side cover
2uc top cover
4 working devices
6 Engine
10 Operator room
14 Counterweight
16 Hydraulic pump
18 Radiator
19 Cooling fan drive means
20 Cooling fan
25a, 25b Swing frame
30 blocks
31 1st block (first slab die cutting product)
32 2nd block (2nd slab die cutting product)
33a Upper surface part
33 3rd block (third slab die cutting product)
34 4th block (4th slab die cutting product)
35a, 35b recess
36 coupling means
37 Cast outer surface member (coating plate)
40 skeleton
42 Back side of counterweight
44 Front of counterweight
47 Clearance
57A Protrusion of cast outer surface member
57B Protrusion of cast outer surface member
57C Protrusion of cast outer surface member
S Slab material

Claims (7)

A skeleton of a counterweight configured by combining blocks made of a plurality of heavy objects in a stepped shape with irregularities in the vertical direction;
A cast outer surface member attached to the skeleton so as to cover at least a part of the outer surface of the skeleton,
The cast outer surface member fills a space formed between the outer surface of the framework and the cast outer surface member, and protrudes toward the framework so as to fit with the outer surface of the framework. Have
A counterweight, wherein the protrusion of the cast outer surface member and the skeleton are directly connected by a bolt. 2. The counterweight according to claim 1, wherein the plurality of heavy blocks are made of slab material. The counterweight according to claim 1, wherein the skeleton has a coupling means for coupling the blocks made of the plurality of heavy objects. 4. The counter according to claim 1, wherein the cast outer surface member is configured to cover at least one of a rear surface side and a side surface side of the counterweight. weight. A skeleton construction step of creating a counterweight skeleton by combining blocks made of a plurality of heavy objects in a stepped shape with irregularities in the vertical direction;
The outer surface of at least a part of the skeleton is fitted with the outer surface of the skeleton by filling a space formed between the outer surface of the skeleton and the outer surface member of the casting with a cast outer surface member having a protrusion. Covering process to cover,
A counterweight manufacturing method comprising: a connecting step of directly connecting the projecting portion of the cast outer surface member and the skeleton with a bolt. 6. The method of manufacturing a counterweight according to claim 5, further comprising a die cutting step for cutting a slab material forming a block made of a plurality of heavy objects into a shape set according to design specifications. 6. The skeleton forming step includes forming the block as a divided block having a plurality of types of shapes, and combining the plurality of divided blocks to form the skeleton determined according to design specifications. Or the counterweight manufacturing method of 6.

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