JP7682826B2 - Heavy machinery work platform - Google Patents

Description

This disclosure relates to a work platform for heavy machinery.

Horizontal installation structures for crawler cranes have been known for some time. For example, the following Patent Document 1 describes a horizontal installation structure in which a crawler crane used on an inclined surface is installed horizontally or approximately horizontally using an inclined platform (Claim 1, paragraph 0008, etc.). The inclined platform is made up of a steel band, a pair of support platforms, and a pair of jack devices.

The steel band is laid in the gradient direction of the inclined surface. The pair of support stands are arranged along both side edges of the steel band to support the side edges, and are arranged side by side with a gap that allows the crawlers of the crawler crane to move. The pair of jack devices are installed on the outside of each of the pair of support stands at the bottom in the gradient direction, and raise and lower the support stands together with the steel band.

Furthermore, this conventional horizontal installation structure is equipped with a wedge-shaped camber member that is inserted from below in the gradient direction into the gap between the inclined surface and the steel strip that has been raised by jacking up with a jack device. This wedge-shaped camber member has an inclination angle that corresponds to the angle of the gradient of the inclined surface.

In this conventional horizontal installation structure, a pair of inclined platforms are installed at the installation positions of the pair of left and right crawlers of the crawler crane, and the crawler crane is moved until the rear parts of the pair of left and right crawlers in the moving direction are placed on the band-shaped steel plates of the pair of inclined platforms. After that, the lower parts of the support frames in the gradient direction are jacked up with a jack device, so that the band-shaped steel plate on which the crawlers are placed is positioned horizontally or approximately horizontally. Then, wedge-shaped camber members are inserted and positioned in the gaps between the band-shaped steel plate and the inclined surface created by the jacking up, and the crawler crane is installed horizontally or approximately horizontally.

Scaffolding for heavy machinery on slopes that is equipped with a self-propelled means is also known. The scaffolding for heavy machinery described in the following Patent Document 2 has an overall wedge-shaped profile in side view, with one side of the profile facing the tracks or wheels of the heavy machinery when it is placed on top, and the other side of the profile facing the slope of the slope (claims 3 and 6, paragraphs 0015 and 0016, etc.).

JP 2012-197145 A JP 2016-17366 A

In the conventional horizontal installation structure described in Patent Document 1, when installing a pair of inclined platforms, it is necessary to hoist the steel band and the pair of support frames with a crawler crane, which makes the installation work complicated. In addition, while balancing the left and right steel bands on which the crawler crane is mounted, the lower parts of the support frames in the gradient direction must be jacked up with a jack device, making the horizontal installation work of the crawler crane extremely complicated.

The conventional scaffolding for heavy machinery described in Patent Document 2 is intended to be used with heavy machinery equipped with jack-up devices. Specifically, when using this conventional scaffolding for heavy machinery, first, the jack-up devices equipped on the lower running body of the crane are operated, and the crane is jacked up so that there is almost no tilt. After that, a scaffolding for heavy machinery that has been prepared in advance and is roughly wedge-shaped in plan view is hoisted by the matching crane and moved directly behind the crane.

Then, with the tip of the scaffolding, which is acutely angled when viewed from the side, facing the crane, it is moved horizontally and a part of the scaffolding near the tip is inserted into the wedge-shaped space between the bottom of the crane's tracks and the covering surface. In other words, to install this conventional scaffolding, in addition to heavy machinery such as a crane that sits on the scaffolding, a companion crane is also required to install the scaffolding.

This disclosure provides a work platform for heavy machinery that can easily form a horizontal or nearly horizontal support surface on an inclined surface.

According to one aspect of the present disclosure, there is provided a work platform for heavy machinery comprising a main body made of foamed resin and a load distribution plate installed on the main body, the main body having an upper surface that forms a support surface that is horizontal or closer to horizontal than an inclined surface on which heavy machinery works when installed on the inclined surface, and an inclined bottom surface that is inclined with respect to the upper surface at an angle corresponding to the inclination angle of the inclined surface and is arranged facing the inclined surface, the load distribution plate having a tip portion that protrudes from a tip of the main body that is arranged on the upper side in the inclination direction of the inclined surface and is arranged on the inclined surface, and has elasticity that deflects along the upper surface of the main body and the inclined surface when receiving a load of the heavy machinery, the upper surface of the main body having a top surface tip portion adjacent to the tip of the main body and a top surface rear portion adjacent to a rear end of the main body opposite to the tip, and the top surface tip portion is inclined with respect to the top surface rear portion such that an angle between the top surface tip portion and the inclined surface when the main body is installed on the inclined surface is larger than an angle between the top surface rear portion and the inclined surface.

In the above-described embodiment of the heavy machinery work platform, the main body forming the support surface for the heavy machinery is made of foamed resin. Therefore, the foamed resin main body, which is lighter than metal or wood, can be carried by an operator and placed on an inclined surface on which a crane or other heavy machinery will work. When placing the main body on an inclined surface, the inclined bottom surface of the main body, which is inclined at an angle corresponding to the inclination angle of the inclined surface relative to the upper surface of the main body, is placed opposite the inclined surface. This allows the upper surface of the main body placed on the inclined surface to form a support surface that is horizontal or closer to horizontal than the inclined surface. The inclination angle of the inclined surface is the angle of inclination of the inclined surface from the horizontal plane.

In addition, in the above-mentioned embodiment of the work platform for heavy machinery, the support surface formed by the upper surface of the main body supports the heavy machinery via a load distribution plate installed on the main body. As a result, the load of the heavy machinery performing work on the load distribution plate is distributed by the load distribution plate and acts uniformly over a wide area of the upper surface of the main body on which the load distribution plate is installed. Therefore, the above-mentioned embodiment of the work platform for heavy machinery prevents stress concentration on the upper surface of the main body due to the load of the heavy machinery, prevents damage to the main body made of foamed resin, and makes it possible to support heavy heavy machinery with the main body.

In addition, when the main body of the heavy machinery work platform of the above embodiment is installed on an inclined surface, the inclined surface and the upper surface of the main body are adjacent to each other at the tip of the main body that is located on the upper side in the inclination direction of the inclined surface. Here, the inclination direction of the inclined surface is the direction along the maximum inclination line of the inclined surface, and the direction in which the gradient of the inclined surface is maximum. In this state, the inclined surface is inclined at the inclination angle of the inclined surface or an angle close to it with respect to the upper surface of the main body, which is horizontal or closer to horizontal than the inclined surface. In addition, the tip of the load distribution plate installed on the upper surface of the main body protrudes from the tip of the main body and is located on the inclined surface.

Therefore, when the heavy machinery moves from the inclined surface onto the main body of the heavy machinery work platform, it climbs onto the tip of the load distribution plate placed on the inclined surface and then moves onto the load distribution plate placed on the main body. At this time, the load distribution plate has the elasticity to bend along the upper surface of the main body and the inclined surface when it receives the load of the heavy machinery, so that the tip of the load distribution plate elastically deforms into a concave curved shape, increasing the contact area between the load distribution plate and the heavy machinery. Therefore, when the heavy machinery climbs onto the load distribution plate installed on the main body from the inclined surface, the load acting on the load distribution plate is distributed, the stress acting from the load distribution plate on the tip of the main body is reduced, and damage to the tip of the foamed resin main body can be prevented.

Furthermore, in the above-mentioned embodiment of the heavy machinery work platform, the upper surface of the main body has an upper surface tip portion adjacent to the tip of the main body, and an upper surface rear portion adjacent to the rear end of the main body opposite the tip of the main body. The upper surface tip portion is inclined relative to the upper surface rear portion so that, when the main body is placed on the inclined surface, the angle between the upper surface tip portion and the inclined surface is larger than the angle between the upper surface rear portion and the inclined surface. With this configuration, the angle between the upper surface tip portion and the inclined surface and the angle between the upper surface tip portion and the upper surface rear portion can each be set to two right angles, i.e., closer to 180 degrees (π radians), than the angle between the upper surface rear portion and the inclined surface.

As a result, when the heavy equipment moves from the inclined surface onto the main body of the heavy equipment work platform, it rides up onto the tip of the load distribution plate placed on the inclined surface, and then moves onto the load distribution plate placed on the tip of the top surface of the main body. This makes it possible to support the load distribution plate, which bends under the load of the heavy equipment, over a wider area of the top surface, including the tip of the top surface and the rear part of the top surface of the main body, distributing the load acting from the load distribution plate to the top surface of the main body and reducing the stress acting on the main body. This makes it possible to prevent damage to the foamed resin main body that supports the load of the heavy equipment.

In addition, in the heavy machinery work platform of the above aspect, the main body may be divided into a plurality of divided blocks in at least one direction of a vertical direction perpendicular to the top surface, a front-rear direction perpendicular to the vertical direction from the front end to the rear end, or a left-right direction perpendicular to the vertical direction and the front-rear direction.

This configuration allows the individual divided blocks that make up the main body of the heavy machinery work platform to be made lighter, making it easier to install the main body by hand. Also, the dimensions of the individual divided blocks can be reduced, making them easier to transport. Also, by increasing the number of divided blocks, a large main body that can be used with large heavy machinery can be constructed.

In addition, in the above-described embodiment of the heavy machinery work platform, the main body may be divided into the plurality of divided blocks in the vertical direction by one or more upper and lower dividing surfaces, and when the main body is arranged so that the upper surface forming the support surface is aligned with a horizontal surface, the inclination angle of each of the upper and lower dividing surfaces may be smaller than the inclination angle of the inclined bottom surface of the main body.

With this configuration, by increasing or decreasing the number of divided blocks stacked vertically depending on the inclination angle of the inclined surfaces, a support surface that is horizontal or closer to horizontal than each of the inclined surfaces can be formed by the upper surface of the main body on multiple inclined surfaces with different inclination angles. In this case, the lower upper and lower divided surfaces of each divided block can be used as the inclined bottom surface of the main body that is placed opposite the inclined surfaces, and the upper upper and lower divided surfaces of each divided block can be used as the upper surface of the main body that forms the support surface.

In addition, in the heavy machinery work platform of the above aspect, both ends of the load distribution plate may be located inside both ends of the main body or both ends of each of the multiple divided blocks in the left-right direction.

With this configuration, both ends of the load distribution plate in the left-right direction do not protrude from both ends of the main body or from both ends of each of the pair of split blocks arranged at a distance, and the entire left-right direction of the load distribution plate is supported by the upper surface, which is the support surface of the main body. This prevents heavy machinery from resting on the ends of the load distribution plate that are not supported by the support surface of the main body, improving the stability of heavy machinery on the heavy machinery work platform.

In addition, in the heavy machinery work platform of the above aspect, the main body may be divided into the multiple divided blocks by one or more front-rear dividing surfaces in the front-rear direction, and the load distribution plate may be divided into multiple divided plates at positions in the front-rear direction different from the front-rear dividing surfaces of the main body.

With this configuration, each divided plate constituting the load distribution plate is placed on the front-rear dividing surface that divides the main body into multiple divided blocks in the front-rear direction. This prevents adjacent divided blocks in the front-rear direction from shifting in the up-down, left-right, or front-rear direction, improving the stability of a heavy machinery work platform whose main body is composed of multiple divided blocks.

In addition, in the above-described embodiment of the heavy machinery work platform, the tip of the upper surface may have a concave curved shape that smoothly connects to the rear part of the upper surface in a cross section parallel to the up-down direction perpendicular to the upper surface and parallel to the front-rear direction from the tip to the rear end.

With this configuration, when heavy machinery moves from an inclined surface onto the main body of the heavy machinery work platform, the contact area between the load distribution plate, which bends into a concave curved shape under the load of the heavy machinery, and the top surface tip of the main body having the above-mentioned concave curved shape can be increased. This makes it possible to distribute the load acting on the top surface of the main body from the load distribution plate and reduce the stress acting on the main body. Therefore, damage to the foamed resin main body that supports the load of the heavy machinery can be prevented.

In addition, in the heavy machinery work platform of the above aspect, the dimension of the top end portion along the front-rear direction may correspond to the dimension of the ground contact portion of the heavy machinery along the front-rear direction. Specifically, the dimension of the top end portion along the front-rear direction can be, for example, 50% or more, 60% or more, 70% or more, 80% or more, or 90% or more of the dimension of the ground contact portion of the heavy machinery along the front-rear direction.

With this configuration, when heavy machinery moves from an inclined surface onto the main body of the heavy machinery work platform, it is possible to more reliably increase the contact area between the load distribution plate, which bends into a concave curved shape under the load of the heavy machinery, and the top surface tip of the main body having the above-mentioned concave curved shape. This makes it possible to more reliably distribute the load acting from the load distribution plate to the top surface of the main body, reducing the stress acting on the main body. Therefore, it is possible to more reliably prevent damage to the foamed resin main body that supports the load of the heavy machinery.

The heavy machinery work platform of the above aspect may also include a resin anti-slip material that is laid on the load distribution plate and has at least one of a plurality of recesses and a plurality of protrusions.

With this configuration, when heavy machinery moves on the load distribution plate installed on the main body of the heavy machinery work platform, at least one of the multiple recesses and multiple protrusions of the resin anti-slip material laid on the load distribution plate can prevent the heavy machinery from slipping. This can improve the stability of heavy machinery working on the heavy machinery work platform.

This disclosure provides a work platform for heavy machinery that can easily form a horizontal or nearly horizontal support surface on an inclined surface.

FIG. 1 is a side view showing a first embodiment of a heavy equipment work platform according to the present disclosure. FIG. 2 is a plan view of the heavy equipment work platform shown in FIG. 1 . FIG. 2 is an enlarged view of a tip of the main body of the heavy machinery work platform shown in FIG. 1 . FIG. 11 is a side view showing a second embodiment of a heavy equipment work platform according to the present disclosure. FIG. 11 is a side view showing a third embodiment of a heavy equipment work platform according to the present disclosure. FIG. 6 is a plan view of the heavy equipment work platform shown in FIG. 5 .

Below, an embodiment of a heavy machinery work platform according to the present disclosure will be described with reference to the drawings.

[Embodiment 1]
Fig. 1 is a side view showing a first embodiment of a heavy machinery work platform according to the present disclosure. Fig. 2 is a plan view of the heavy machinery work platform 1 shown in Fig. 1. Fig. 3 is an enlarged view of a tip 11f of a main body 11 of the heavy machinery work platform 1 shown in Fig. 1.

The heavy machinery work platform 1 of this embodiment is installed on an inclined surface IS, such as at both ends of an elevated bridge, the entrance or exit of an elevated road, or an uphill road, and forms a horizontal support surface SF or a support surface SF closer to horizontal than the inclined surface IS, which serves as a foothold for heavy machinery HM performing work on the inclined surface IS. An example of heavy machinery HM performing work on the heavy machinery work platform 1 is a crane that needs to be installed horizontally in order to hoist materials of a rated load, but is not particularly limited.

The heavy machinery work platform 1 includes a body 11 made of foamed resin and a load distribution plate 12 installed on the body 11. As the foamed resin constituting the body 11, for example, expanded polystyrene is preferable because it is lightweight and easy to ensure the required strength, and if the density is about 15 kg/ ^m3 to 70 kg/ ^m3 , it is more preferable from the viewpoint of strength and light weight. In addition, as the foamed resin constituting the body 11, a foam molded product such as polypropylene, hard urethane, ABS resin, or polyvinyl chloride can be used. In addition, the body 11 may be provided as an integral body, or may be divided into a plurality of divided blocks 111.

The main body 11 can be divided into a plurality of divided blocks 111, for example, in at least one direction: a vertical direction perpendicular to the top surface 11t, a front-rear direction perpendicular to the vertical direction from the tip 11f to the rear end 11r of the main body 11, or a left-right direction perpendicular to the vertical direction and the front-rear direction. Each figure shows a three-dimensional Cartesian coordinate system including an X-axis parallel to the front-rear direction, a Y-axis parallel to the left-right direction, and a Z-axis parallel to the vertical direction.

In the example shown in Figures 1 and 2, the main body 11 is divided into two in the front-rear direction by a single front-rear dividing surface 112, and also divided into two in the left-right direction, resulting in a total of four divided blocks 111. More specifically, a pair of two divided blocks 111 arranged side by side in the front-rear direction are spaced apart in the left-right direction. The main body 11 is installed so that the distance D between the center lines C of the left and right pairs of these two front-rear divided blocks 111 matches, for example, the distance between the center lines of the left and right crawlers of a crane, which is the ground contact part FP of the heavy machine HM.

The planar shape of the two divided blocks 111 arranged in the front-rear direction is, for example, a rectangle with the front-rear direction as the longitudinal direction. The main body 11 may be divided into three or more divided blocks 111 in the front-rear direction by two or more front-rear dividing surfaces 112. The main body 11 may also be divided into three or more divided blocks 111 in the left-right direction by two or more left-right dividing surfaces. In this case, the multiple divided blocks 111 arranged in the left-right direction may be arranged without any gaps in the left-right direction.

The load distribution plate 12 is, for example, a hard rectangular plate-like member that is placed on the main body 11. In the example shown in FIG. 2, the load distribution plate 12 has a rectangular planar shape with the longitudinal direction being the front-to-rear direction of the main body 11. The material of the load distribution plate 12 is not particularly limited, but a material that has sufficient strength to withstand the load of the heavy machine HM, such as resin, steel, concrete, fiber-reinforced resin, wood-based composite material, synthetic rubber, or rubber-containing resin, can be selected.

The load distribution plate 12 has a tip 12f that protrudes from the tip 11f of the main body 11, which is located above the inclination direction Dd of the inclined surface IS, and is located on the inclined surface IS. Here, the inclination direction Dd of the inclined surface IS is the direction along the maximum inclination line of the inclined surface IS, and is the direction in which the gradient of the inclined surface IS is maximum. In addition, the load distribution plate 12 has elasticity that deflects along the upper surface 11t of the main body 11 and the inclined surface IS when it receives the load of the heavy machine HM. Here, the elasticity that deflects along the upper surface 11t of the main body 11 and the inclined surface IS means that when the load distribution plate 12 receives the load of the heavy machine HM, the part that had a space between the upper surface 11t of the main body 11 and the inclined surface IS can be elastically deformed so as to approach the upper surface 11t of the main body 11 and the inclined surface IS.

The load distribution plate 12 is divided into a plurality of divided plates 121, for example, in the front-rear direction of the main body 11 at a position different from the front-rear dividing surface 112 of the main body 11. In the example shown in FIG. 2, the load distribution plate 12 is divided into three divided plates 121 in the front-rear direction, but the number of divided plates 121 is not particularly limited.

In the example shown in FIG. 2, the load distribution plate 12 is divided into two divided plates 121 in the left-right direction as well, similar to the divided block 111 of the main body 11, and the left and right divided plates 121 are arranged with a gap between them. In the left-right direction, both ends of the load distribution plate 12 are arranged inside of both ends of the main body 11. More specifically, a pair of three divided plates 121 arranged in the front-rear direction are arranged with a gap between them, and are arranged on top of a pair of two divided blocks 111 arranged in the front-rear direction. In the left-right direction, both ends of each divided plate 121 are arranged inside of both ends of each divided block 111.

The main body 11 has an upper surface 11t and an inclined bottom surface 11b, and has a wedge-like shape in a side view. When the main body 11 is placed on an inclined surface IS on which the heavy machine HM performs work, the upper surface 11t of the main body 11 forms a support surface SF that is horizontal or closer to horizontal than the inclined surface IS. The inclined bottom surface 11b of the main body 11 is inclined at an angle A corresponding to the inclination angle α of the inclined surface IS with respect to the upper surface 11t of the main body 11, and is disposed opposite the inclined surface IS.

Here, the inclination angle α of the inclined surface IS is the angle of inclination of the inclined surface IS from the horizontal plane. In addition, the angle A corresponding to the inclination angle α of the inclined surface IS includes, for example, an angle equal to the inclination angle α of the inclined surface IS and an angle whose difference from the inclination angle α of the inclined surface IS is equal to or less than a predetermined threshold value. Such a threshold value is, for example, approximately 5% of the inclination angle α of the inclined surface IS.

The upper surface 11t of the main body 11 has an upper surface tip portion 11tf adjacent to the tip 11f of the main body 11, and an upper surface rear portion 11tr adjacent to the rear end 11r of the main body 11 on the opposite side to the tip 11f of the main body 11. When the main body 11 is placed on the inclined surface IS, as shown in FIG. 3, the upper surface tip portion 11tf is inclined with respect to the upper surface rear portion 11tr so that the angle β between the upper surface tip portion 11tf and the inclined surface IS is larger than the angle γ between the upper surface rear portion 11tr and the inclined surface IS.

In the example shown in FIG. 3, the dimension Ld of the top surface tip 11tf in the front-to-rear direction of the main body 11 is determined according to the thickness T of the tip 11f of the main body 11 and the inclination angle δ of the top surface tip 11tf relative to the top surface rear portion 11tr. In other words, the dimension Ld of the top surface tip 11tf in the front-to-rear direction of the main body 11 is determined, for example, as Ld = T/tan δ.

The operation of the heavy machinery work platform 1 of this embodiment is described below.

As mentioned above, the conventional horizontal installation structure of a crawler crane described in Patent Document 1 requires the crawler crane to hoist the steel band and the pair of support frames when installing a pair of inclined platforms, making installation work complicated. In addition, the lower parts of the support frames in the gradient direction must be jacked up with a jack device while balancing the left and right steel bands on which the crawler crane sits, making the horizontal installation work of the crawler crane extremely complicated.

As mentioned above, the conventional scaffolding material for heavy machinery described in Patent Document 2 is intended to be used with heavy machinery equipped with a jack-up device. Furthermore, in order to install this conventional scaffolding material for heavy machinery, in addition to heavy machinery such as a crane that sits on the scaffolding material for heavy machinery, a companion crane for installing the scaffolding material for heavy machinery is also required.

In contrast, the heavy machinery work platform 1 of this embodiment includes a body 11 made of foamed resin and a load distribution plate 12 installed on the body 11. The body 11 has an upper surface 11t that forms a support surface SF that is horizontal or closer to horizontal than the inclined surface IS when installed on the inclined surface IS on which the heavy machinery HM works. The body 11 also has an inclined bottom surface 11b that is inclined at an angle A corresponding to the inclination angle α of the inclined surface IS with respect to the upper surface 11t and is arranged opposite the inclined surface IS. The load distribution plate 12 has a tip portion 12f that protrudes from the tip 11a of the body 11 that is arranged above the inclination direction Dd of the inclined surface IS and is arranged on the inclined surface IS, and has elasticity that bends along the upper surface 11t of the body 11 and the inclined surface IS when it receives the load of the heavy machinery HM. The upper surface 11t of the main body 11 has an upper surface tip portion 11tf adjacent to the tip 11f of the main body 11, and an upper surface rear portion 11tr adjacent to the rear end 11r of the main body 11 on the opposite side to the tip 11f. The upper surface tip portion 11tf is inclined relative to the upper surface rear portion 11tr so that when the main body 11 is placed on the inclined surface IS, the angle β between the upper surface tip portion 11tf and the inclined surface IS is larger than the angle γ between the upper surface rear portion 11tr and the inclined surface IS.

That is, in the heavy machinery work platform 1 of this embodiment, the main body 11 that forms the support surface SF of the heavy machinery HM is made of foamed resin. Therefore, the main body 11 made of foamed resin, which is lighter than metal or wood, can be carried by an operator and installed on the inclined surface IS on which the heavy machinery HM, such as a crane, works. When the main body 11 is installed on the inclined surface IS, the inclined bottom surface 11b of the main body 11, which is inclined at an angle A corresponding to the inclination angle α of the inclined surface IS with respect to the upper surface 11t of the main body 11, faces the inclined surface IS. This allows the upper surface 11t of the main body 11 installed on the inclined surface IS to form a support surface SF that is horizontal or closer to horizontal than the inclined surface IS. Therefore, according to the heavy machinery work platform 1 of this embodiment, a support surface SF that is horizontal or closer to horizontal can be easily formed on the inclined surface IS.

In addition, in the heavy machinery work platform 1 of this embodiment, the support surface SF formed by the upper surface 11t of the main body 11 supports the heavy machinery HM via the load distribution plate 12 installed on the main body 11. As a result, the load of the heavy machinery HM performing work on the load distribution plate 12 is distributed by the load distribution plate 12 and acts uniformly over a wide area of the upper surface 11t of the main body 11 on which the load distribution plate 12 is installed. Therefore, according to the heavy machinery work platform 1 of this embodiment, it is possible to prevent stress concentration on the upper surface 11t of the main body 11 due to the load of the heavy machinery HM, prevent damage to the foamed resin main body 11, and make it possible for the main body 11 to support heavy heavy machinery HM.

In addition, when the main body 11 of the heavy machinery work platform 1 of this embodiment is installed on the inclined surface IS, the inclined surface IS and the upper surface 11t of the main body 11 are adjacent to each other at the tip 11f of the main body 11, which is located above the inclination direction Dd of the inclined surface IS. In this state, the inclined surface IS is inclined at the inclination angle α of the inclined surface IS or an angle close to it with respect to the upper surface 11t of the main body 11, which is horizontal or closer to horizontal than the inclined surface IS. In addition, the tip 12f of the load distribution plate 12 installed on the upper surface 11t of the main body 11 protrudes from the tip 11f of the main body 11 and is located on the inclined surface IS.

Therefore, when the heavy machine HM moves from the inclined surface IS onto the main body 11 of the heavy machine work platform 1, it climbs onto the tip 12f of the load distribution plate 12 arranged on the inclined surface IS, and then moves onto the load distribution plate 12 arranged on the main body 11. At this time, the load distribution plate 12 has elasticity that deflects along the upper surface 11t of the main body 11 and the inclined surface IS when it receives the load of the heavy machine HM, so that the tip 12f of the load distribution plate 12 elastically deforms into a concave curved surface shape, increasing the contact area between the tip 12f and the heavy machine HM. Therefore, when the heavy machine HM climbs onto the load distribution plate 12 installed on the main body 11 from the inclined surface IS, the load acting on the load distribution plate 12 is distributed, the stress acting from the load distribution plate 12 on the tip 11f of the main body 11 is reduced, and damage to the tip 11f of the foamed resin main body 11 can be prevented.

Furthermore, in the heavy machinery work platform 1 of this embodiment, the upper surface 11t of the main body 11 has an upper surface tip portion 11tf adjacent to the front end 11f of the main body 11, and an upper surface rear portion 11tr adjacent to the rear end 11r of the main body 11 on the opposite side to the front end 11f of the main body 11. The upper surface tip portion 11tf is inclined relative to the upper surface rear portion 11tr so that, when the main body 11 is placed on the inclined surface IS, the angle β between the upper surface tip portion 11tf and the inclined surface IS is larger than the angle γ between the upper surface rear portion 11tr and the inclined surface IS. With this configuration, the angle β between the upper surface tip portion 11tf and the inclined surface IS and the angle δ between the upper surface tip portion 11tf and the upper surface rear portion 11tr can be set to two right angles, i.e., closer to 180 degrees (π radians), than the angle γ between the upper surface rear portion 11tr and the inclined surface IS.

As a result, when the heavy machine HM moves from the inclined surface IS onto the main body 11 of the heavy machine work platform 1, it rides up onto the tip 12f of the load distribution plate 12 arranged on the inclined surface IS, and then moves onto the load distribution plate 12 arranged on the top surface tip 11tf of the main body 11. This allows the load distribution plate 12, which bends under the load of the heavy machine HM, to be supported over a wider range of the top surface 11t, including the top surface tip 11tf and top surface rear portion 11tr of the main body 11, and distributes the load acting from the load distribution plate 12 to the top surface 11t of the main body 11, thereby reducing the stress acting on the main body 11. Therefore, damage to the foamed resin main body 11 that supports the load of the heavy machine HM can be prevented.

In addition, in the heavy machinery work platform 1 of this embodiment, the main body 11 is divided into multiple divided blocks 111 in at least one direction: the up-down direction perpendicular to the top surface 11t, the front-rear direction perpendicular to the up-down direction from the front end 11f to the rear end 11r, or the left-right direction perpendicular to the up-down direction and the front-rear direction.

This configuration allows the individual divided blocks 111 that make up the main body 11 of the heavy machinery work platform 1 to be made lighter, making it easier to install the main body 11 manually. Also, the dimensions of the individual divided blocks 111 can be reduced, making them easier to transport. Also, by increasing the number of divided blocks 111, a large main body 11 that can be used for large heavy machinery HM can be constructed.

In addition, in the heavy machinery work platform 1 of this embodiment, both ends of the load distribution plate 12 are positioned inward in the left-right direction from both ends of the main body 11 or both ends of each of the multiple divided blocks 111.

With this configuration, both left and right ends of the load distribution plate 12 or the dividing plate 121 do not protrude from both ends of the main body 11 or from both ends of each of a pair of dividing blocks 111 arranged at a distance, and the entire left and right sides of the load distribution plate 12 are supported by the upper surface 11t, which is the support surface SF of the main body 11. Therefore, heavy machinery HM is prevented from resting on the ends of the load distribution plate 12 that are not supported by the support surface SF of the main body 11, and the stability of the heavy machinery HM on the heavy machinery work platform 1 can be improved.

In addition, in the heavy machinery work platform 1 of this embodiment, the main body 11 is divided into multiple divided blocks 111 in the front-rear direction by one or more front-rear dividing surfaces 112. In addition, the load distribution plate 12 is divided into multiple divided plates 121 in the front-rear direction at positions different from the front-rear dividing surfaces 112 of the main body 11.

With this configuration, each of the dividing plates 121 that make up the load distribution plate 12 is placed on the front-rear dividing surface 112 that divides the main body 11 into multiple divided blocks 111 in the front-rear direction. This prevents each of the divided blocks 111 adjacent in the front-rear direction from shifting in the up-down, left-right, or front-rear direction, improving the stability of the heavy machinery work platform 1, whose main body 11 is made up of multiple divided blocks 111.

As described above, this embodiment provides a work platform 1 for heavy machinery that can easily form a horizontal or nearly horizontal support surface SF on an inclined surface IS.

[Embodiment 2]
Next, a second embodiment of the heavy machinery work platform according to the present disclosure will be described with reference to Fig. 4, with reference to Fig. 2 and Fig. 3 of the first embodiment. The heavy machinery work platform 1 of this embodiment has the same configuration as the heavy machinery work platform 1 of the first embodiment, except for the configuration described below. Therefore, in the heavy machinery work platform 1 of this embodiment, the same parts as those of the heavy machinery work platform 1 of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

In the heavy machinery work platform 1 of this embodiment, the main body 11 is divided into a plurality of divided blocks 111 in the vertical direction by one or more upper and lower dividing surfaces 113. In addition, in the heavy machinery work platform 1 of this embodiment, when the main body 11 is arranged so that the top surface 11t of the main body 11 forming the support surface SF is aligned with a horizontal surface, the inclination angle λ of each of the upper and lower dividing surfaces 113 is smaller than the inclination angle B of the inclined bottom surface 11b of the main body 11.

With this configuration, by increasing or decreasing the number of divided blocks 111 stacked vertically according to the inclination angle ε of the inclined surface IS, a support surface SF that is horizontal or closer to horizontal than each of the inclined surfaces IS can be formed by the upper surface 11t of the main body 11 on multiple inclined surfaces IS with different inclination angles ε. In this case, the lower upper and lower divided surfaces 113 of each divided block 111 can be used as the inclined bottom surface 11b of the main body 11 that is arranged opposite the inclined surface IS, and the upper upper and lower divided surfaces 113 of each divided block 111 can be used as the upper surface 11t of the main body 11 that forms the support surface SF.

As described above, according to this embodiment, as in the above-described first embodiment, it is possible to provide a work platform 1 for heavy machinery that can easily form a horizontal or nearly horizontal support surface SF on an inclined surface IS.

[Embodiment 3]
Next, a third embodiment of the heavy machinery work platform according to the present disclosure will be described with reference to Fig. 5 and Fig. 6, with reference to Fig. 3 of the first embodiment. The heavy machinery work platform 1 of this embodiment has the same configuration as the heavy machinery work platform 1 of the first embodiment, except for the configuration described below. Therefore, in the heavy machinery work platform 1 of this embodiment, the same parts as those of the heavy machinery work platform 1 of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 5, in the heavy machinery work platform 1 of this embodiment, the top surface tip portion 11tf has a concave curved shape that smoothly connects to the top surface rear portion 11tr in a cross section parallel to the up-down direction (Z-axis direction) perpendicular to the top surface 11t and parallel to the front-rear direction (X-axis direction) from the top surface 11f to the rear end 11r of the main body portion 11.

With this configuration, when the heavy machine HM moves from the inclined surface IS onto the main body 11 of the heavy machine work platform 1, the contact area between the load distribution plate 12, which bends into a concave curved shape under the load of the heavy machine HM, and the top surface tip 11tf of the main body 11, which has a concave curved shape, can be increased. This distributes the load acting from the load distribution plate 12 to the top surface 11t of the main body 11, reducing the stress acting on the main body 11. Therefore, damage to the foamed resin main body 11, which supports the load of the heavy machine HM, can be prevented.

In addition, in the heavy machinery work platform 1 of this embodiment, the dimension Ld along the front-rear direction of the top surface tip 11tf of the main body 11 may correspond to the dimension along the front-rear direction of the ground contact part FP of the heavy machinery HM. Specifically, the dimension Ld along the front-rear direction of the top surface tip 11tf of the main body 11 can be, for example, 50% or more, 60% or more, 70% or more, 80% or more, or 90% or more of the dimension along the front-rear direction of the ground contact part FP of the heavy machinery HM, such as the crawler of a crane.

With this configuration, when the heavy machine HM moves from the inclined surface IS onto the main body 11 of the heavy machine work platform 1, the contact area between the load distribution plate 12, which bends into a concave curved shape under the load of the heavy machine HM, and the top surface tip 11tf of the main body 11 having the above-mentioned concave curved shape, can be more reliably increased. This makes it possible to more reliably distribute the load acting on the top surface of the main body 11 from the load distribution plate 12, reducing the stress acting on the main body 11. Therefore, it is possible to more reliably prevent damage to the foamed resin main body 11 that supports the load of the heavy machine HM.

In addition, in the heavy machinery work platform 1 of this embodiment, the main body 11 and the load distribution plate 12 are integrally provided without being divided from one end located outside both ends of the heavy machinery HM in the left-right direction to the other end, as shown in FIG. 6. With this configuration, the load acting on the load distribution plate 12 from the heavy machinery HM can be distributed over a wider area of the upper surface 11t of the main body 11, reducing the stress acting on the main body 11 and more reliably preventing damage to the foamed resin main body 11.

The heavy machinery work platform 1 of this embodiment is provided with a resin anti-slip material 13 that is laid on the load distribution plate 12 and has at least one of a plurality of concave portions and a plurality of convex portions, as shown in FIG. 5. As the anti-slip material 13, for example, a single-sided convex type or single-sided concave type of Repeaty Board (registered trademark) manufactured by Ohashi Co., Ltd., or the Julite (registered trademark) series or Super Julite (registered trademark) series manufactured by Keiyo Kogyo Co., Ltd. can be used.

With this configuration, when the heavy machine HM moves on the load distribution plate 12 installed on the heavy machine work platform 1, at least one of the multiple concave portions and multiple convex portions of the resin anti-slip material 13 laid on the load distribution plate 12 can prevent the heavy machine HM from slipping. Therefore, the stability of the heavy machine HM working on the heavy machine work platform 1 can be improved.

As described above, according to this embodiment, as in the above-described first embodiment, it is possible to provide a work platform 1 for heavy machinery that can easily form a horizontal or nearly horizontal support surface SF on an inclined surface IS.

The above detailed description uses drawings to illustrate an embodiment of a heavy machinery work platform according to the present disclosure, but the specific configuration is not limited to this embodiment, and even if there are design changes, etc., that do not deviate from the gist of this disclosure, they are included in this disclosure.

1 Work platform for heavy machinery 11 Main body 111 Dividing block 112 Front and rear dividing surfaces 113 Upper and lower dividing surfaces 11b Sloped bottom surface 11f Tip 11r Rear end 11t Top surface 11tf Top tip 11tr Top rear section 12 Load dispersion plate 121 Dividing plate 12f Tip 13 Anti-slip material A Angle B Inclination angle Dd Inclination direction FP Ground contact part HM Heavy equipment IS Inclined surface Ld Dimension SF Support surface α Inclination angle β Angle γ Angle ε Inclination angle λ Inclination angle

Claims (8)

A work platform for heavy machinery comprising a body made of foamed resin and a load distribution plate installed on the body,
The main body has an upper surface that forms a support surface that is horizontal or closer to horizontal than the inclined surface when the heavy equipment is installed on the inclined surface on which the heavy equipment works, and an inclined bottom surface that is inclined at an angle corresponding to the inclination angle of the inclined surface with respect to the upper surface and is disposed opposite the inclined surface,
the load distribution plate has a tip portion that protrudes from a tip of the main body portion that is disposed on the upper side in the inclination direction of the inclined surface and is disposed on the inclined surface, and has elasticity that deflects along the upper surface of the main body portion and the inclined surface when receiving a load of the heavy machine,
the top surface of the body portion has a top surface leading portion adjacent to the leading end of the body portion and a top surface rear portion adjacent to a rear end of the body portion opposite the leading end,
A work platform for heavy machinery, characterized in that the tip portion of the upper surface is inclined relative to the rear portion of the upper surface so that, when the main body is placed on the inclined surface, the angle between the tip portion of the upper surface and the inclined surface is larger than the angle between the rear portion of the upper surface and the inclined surface. The work platform for heavy machinery according to claim 1, characterized in that the main body is divided into a plurality of divided blocks in at least one of the following directions: a vertical direction perpendicular to the top surface, a front-rear direction perpendicular to the vertical direction from the front end to the rear end, or a left-right direction perpendicular to the vertical direction and the front-rear direction. The main body is divided into the plurality of divided blocks by one or more upper and lower dividing surfaces in the vertical direction,
3. The work platform for heavy machinery according to claim 2, characterized in that, when the main body is positioned so that the upper surface forming the support surface is aligned along a horizontal plane, the inclination angle of each of the upper and lower divided surfaces is smaller than the inclination angle of the inclined bottom surface of the main body. The heavy machinery work platform according to claim 2, characterized in that, in the left-right direction, both ends of the load distribution plate are positioned inside both ends of the main body or both ends of each of the multiple divided blocks. The main body is divided into the plurality of divided blocks by one or more front-rear dividing surfaces in the front-rear direction,
3. The work platform for heavy machinery according to claim 2, wherein the load distribution plate is divided into a plurality of divided plates at positions different from the front-rear dividing plane of the main body in the front-rear direction. The work platform for heavy machinery according to claim 1, characterized in that the tip of the upper surface has a concave curved shape that smoothly connects to the rear part of the upper surface in a cross section parallel to the up-down direction perpendicular to the upper surface and parallel to the front-rear direction from the tip to the rear end. The work platform for heavy machinery according to claim 6, characterized in that the dimension of the top surface tip along the front-rear direction corresponds to the dimension of the ground contact portion of the heavy machinery along the front-rear direction. The work platform for heavy machinery according to claim 1, characterized in that it is provided with a resin anti-slip material laid on the load distribution plate and having at least one of a plurality of recesses and a plurality of protrusions.

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