Structure of an inclined platform and method for adjusting the installation angle of a heavy equipment crane on an inclined platform

Abstract

To provide a structure for an inclined platform and a method for adjusting the installation angle of a heavy equipment crane on an inclined platform, which allows a heavy equipment crane to be installed in a stable, horizontal position at the foremost part of the inclined platform using a simple angle adjustment mechanism. [Solution] In an inclined platform 20 having an upward slope in the direction of the bridge axis, which has a rear ramp section 20a adjacent to the bridge axis direction and a front installation section 20b located above the rear ramp section 20a, the front installation section 20b is equipped with a suspension frame 30 that can accommodate the traveling body 11 of a heavy machinery crane 10, and multiple covering plates 22 that can be interchanged. When the suspension frame 30 is installed in the front installation section 20b, the heavy machinery crane 10 can be installed horizontally by driving the heavy machinery crane 10 onto the horizontal floor 32 of the suspension frame 30.

Description

Technical Field

[0001] The present invention relates to the structure of an inclined gantry on an uphill slope, and particularly to a structure of an inclined gantry that can be installed at the tip of the inclined gantry without setback while ensuring the horizontality of a heavy crane.

Background Art

[0002] Referring to FIG. 7 for explanation, a general inclined gantry is constructed by obliquely spanning a main girder 21 between the heads of a plurality of support piles 25 and mounting a plurality of covering plates 22 on the upper surfaces of adjacent main girders 21. When installing a heavy crane 10 such as a crawler crane on an inclined gantry on an uphill slope for construction work, the rated load of the heavy crane 10 is determined as that in the horizontally installed state. When the heavy crane 10 is installed obliquely, the posture of the heavy crane 10 becomes unstable during operation, and the risk of inducing an accident increases. For this reason, when installing the heavy crane 10 on an inclined gantry with an uphill slope, a wedge-shaped horizontal gantry 50 having a substantially triangular shape is used (Patent Documents 1 and 2).

[0003] Regarding the installation method of the heavy crane 10 on the inclined gantry with an uphill slope in detail, the heavy crane 10 is advanced to the retreat position S1 at the forefront of the inclined gantry, and the horizontal gantry 50 is installed on the inclined gantry on the side opposite to the advancing direction (rear) of the heavy crane 10. The temporarily placed heavy crane 10 is set back and rides onto the horizontal gantry 50 to install the heavy crane 10 horizontally.

[0004] In addition, since the slope of the inclined gantry varies depending on the site, it has also been proposed to incorporate a jack into the horizontal gantry to configure the mounting surface of the heavy crane to be angle-adjustable (Patent Document 3).

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Japanese Patent Publication No. 2000-145152 [Patent Document 2] Japanese Patent Publication No. 2005-263406 [Patent Document 3] Japanese Utility Model Publication No. 2-132788 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] Conventional heavy equipment crane installation techniques for inclined platforms with an upward slope have the following problems that need to be solved. <1> In an inclined platform with an upward slope, the heavy equipment crane 10 is assumed to be set back, so it is not possible to horizontally position the heavy equipment crane 10 at the furthest retraction position S1 of the inclined platform. <2> The final installation position S2 of the heavy equipment crane 10 is a position further back than the retracted position S1. The further the installation position S2 of the heavy equipment crane 10 is shifted backward, the smaller the working radius of the heavy equipment crane 10 becomes by the amount it has moved backward. On the other hand, if the heavy equipment crane 10 attempts to drive support piles for the next span ahead from a position set back from the leading edge of the inclined platform, the working radius from the heavy equipment crane 10 becomes large, requiring the use of a heavy equipment crane 10 with a larger working radius. <3> Horizontal mounting frames with angle adjustment capabilities have a complex structure and are very expensive to manufacture.

[0007] The object of the present invention is to provide a structure for an inclined platform and a method for adjusting the installation angle of a heavy equipment crane on an inclined platform that can solve the conventional problems described above. [Means for solving the problem]

[0008] The present invention comprises a plurality of support piles erected at a predetermined span, a plurality of main girders erected between the heads of the plurality of support piles, a plurality of covering plates stretched across the upper surfaces of adjacent main girders, and a detachable suspension frame that can be installed between adjacent main girders, and is an inclined platform with an upward slope in the direction of the bridge axis on which a self-propelled heavy equipment crane can travel, and has an adjacent rear ramp section along the direction of the bridge axis and a front installation section located above the rear ramp section, the rear ramp section has a plurality of covering plates laid on the upper surfaces of adjacent main girders, and the front installation section is The suspension frame is suspended across the upper surfaces of adjacent main girders, allowing the heavy equipment crane's vehicle to drive onto it. The suspension frame is interchangeable with a plurality of covering plates that can be laid on the upper surfaces of adjacent main girders. The suspension frame is equipped with at least a horizontal floor located horizontally between adjacent main girders, and the horizontal floor is continuous with the covering plates of the rear ramp section. When the suspension frame is installed in the front installation section, the heavy equipment crane can be horizontally installed by driving it onto the horizontal floor of the suspension frame from the rear ramp section. In another embodiment of the present invention, the system comprises a plurality of suspension frames that can be installed between adjacent main girders. In another embodiment of the present invention, the suspension frame comprises a pair of mounting plates for obtaining a reaction force from adjacent main girders, a horizontal floor positioned horizontally between adjacent main girders, and a pair of suspension members connecting the sides of the mounting plates and the horizontal floor in the vertical direction. In other embodiments of the present invention, the pair of suspension members may be made of steel members whose length cannot be adjusted, or the suspension members may be made of a plurality of suspension bolts whose length can be adjusted. In another embodiment of the present invention, the main girder is an H-shaped steel beam, and the mounting plate of the suspension frame is detachably attached to the upper flange of the H-shaped steel beam. The present invention relates to a method for adjusting the installation angle of a heavy machinery crane on an inclined platform having an upward slope in the bridge axis direction, using a suspension frame that allows a self-propelled heavy machinery crane to enter, wherein the inclined platform has a rear ramp section adjacent to the bridge axis direction and a front installation section located above the rear ramp section, the rear ramp section has a plurality of covering plates laid on the upper surface of adjacent main girders of the inclined platform, and the front installation section is suspended by being stretched across the upper surface of adjacent main girders. The lifting platform on which the traveling body of the heavy machinery crane can enter and a plurality of covering plates that can be laid on the upper surface of adjacent main girders are interchangeable, the lifting platform is equipped with at least a horizontal floor located horizontally between adjacent main girders, and there is continuity between the horizontal floor of the lifting platform installed in the front installation section and the covering plates attached to the rear ramp section, and the heavy machinery crane that has ascended the ramp section of the inclined platform is driven onto the horizontal floor of the lifting platform installed in the front installation section and the heavy machinery crane is installed in a horizontal position. In another embodiment of the present invention, the suspension frame comprises a pair of mounting plates for obtaining a reaction force from adjacent main girders, a horizontal floor positioned horizontally between adjacent main girders, and a pair of suspension members connecting the sides of the mounting plates and the horizontal floor in the vertical direction. In other embodiments of the present invention, the pair of suspension members may be made of steel members whose length cannot be adjusted, or the pair of suspension members may be made of a plurality of suspension bolts whose length can be adjusted. [Effects of the Invention]

[0009] The present invention provides at least one of the following effects. <1> In this invention, by providing a suspension frame in the front installation section of the inclined platform, a heavy equipment crane can be installed at the very front of the inclined platform in a stable position while maintaining horizontality. Therefore, construction can be carried out efficiently using heavy machinery cranes with a smaller working radius compared to conventional methods. <2> The suspension frame has an extremely simple structure, consisting only of a horizontal floor. This eliminates the need for special angle adjustment jacks, allowing for the economical manufacture of the suspension frame. <3>Since the covering board laid on the rear ramp section of the inclined gantry and the horizontal floor of the suspension gantry are continuous, the heavy crane can smoothly and safely transfer onto the horizontal floor of the suspension gantry. <4>If a covering board is laid on the front installation section of the inclined gantry, the heavy crane can be self-propelled toward the inclined gantry of the next span. <5>If a pair of suspension members constituting the suspension gantry are composed of suspension bolts with adjustable lengths, the horizontality of the horizontal floor can be ensured by a simple operation of adjusting the hanging length of the suspension members without being affected by the gradient of the inclined gantry.

Brief Description of the Drawings

[0010] [Figure 1] Perspective view of the inclined gantry according to the present invention [Figure 2] Cross-sectional view taken along line II-II in FIG. 1 [Figure 3] Enlarged cross-sectional view of the attachment portion of the main girder and the suspension gantry [Figure 4A] Explanatory drawing of the method for adjusting the installation angle of the heavy crane, longitudinal sectional view of the inclined gantry with a suspension gantry installed in the front installation section [Figure 4B] Explanatory drawing of the method for adjusting the installation angle of the heavy crane, longitudinal sectional view of the inclined gantry with a heavy crane installed on the suspension gantry in the front installation section [Figure 4C] Explanatory drawing of the method for adjusting the installation angle of the heavy crane, longitudinal sectional view of the inclined gantry when the suspension gantry provided in the front installation section is removed [Figure 4D] Explanatory drawing of the method for adjusting the installation angle of the heavy crane, longitudinal sectional view of the inclined gantry with a covering board laid in the front installation section [Figure 5A] Longitudinal sectional view of the inclined gantry with a part omitted according to Example 2 provided with another suspension gantry [Figure 5B] Cross-sectional view taken along line B-B in FIG. 5A [Figure 6] Cross-sectional view of the inclined gantry according to Example 3 provided with another suspension gantry [Figure 7] Explanatory drawing of the conventional installation method of the heavy crane using a horizontal gantry

Modes for Carrying Out the Invention

[0011] Embodiments of the present invention will be described in detail below with reference to the drawings.

[0012] [Example 1] 1. Heavy machinery crane In this invention, the heavy equipment crane 10 refers to a self-propelled crane such as a crawler crane. The heavy equipment crane 10 has a mobile body. In this example, we describe a configuration in which the running body 11 consists of a pair of left and right crawlers (endless tracks), but the running body 11 may also consist of multiple tire-type wheels.

[0013] 2. Slanted gantry In this example, we will describe a configuration in which an inclined platform 20 with an upward slope in the direction of the bridge axis is constructed.

[0014] <1> Overview of the Inclined Platform Referring to Figures 1 and 2, the inclined platform 20 is a platform with an upward slope in the direction of the bridge axis, and comprises a plurality of support piles 25 made of, for example, H-shaped steel erected at predetermined spans, a plurality of main girders 21 made of steel supported by the plurality of support piles 25 and erected longitudinally between the heads of the plurality of support piles 25, a covering plate 22 stretched across the upper surfaces of adjacent main girders 21, 21, a transverse girder 23 interposed between the main girders 21 and the support piles 25, and a detachable suspension frame 30 that can be installed between adjacent main girders 21, 21.

[0015] <2> Rear ramp section and front installation section The inclined platform 20 has a rear ramp section 20a and a front installation section 20b adjacent to each other along the bridge axis direction, with the front installation section 20b being higher than the rear ramp section 20a.

[0016] <2.1> Rear ramp section In the rear ramp section 20a, covering plates 22 are laid on the upper surfaces of adjacent main girders 21, 21. The area where the covering plates 22 are laid becomes a ramp with a predetermined gradient, and is a section where the heavy equipment crane 10 can travel at all times.

[0017] <2.2> Front installation section The front installation section 20b is equipped with a suspension frame 30 that is stretched across the upper surfaces of adjacent main girders 21, 21 and a covering plate 22 that is used interchangeably with the suspension frame 30. The front installation section 20b is a section where the suspension frame 30 and the covering plate 22 can be swapped. When the suspension frame 30 is installed, the heavy equipment crane 10 can be installed horizontally, and when the covering plate 22 is installed, the heavy equipment crane 10 can travel. The main components of the inclined platform 20 will be described below.

[0018] <3> Main girder The main girder 21 is common to both the rear ramp section 20a and the front installation section 20b. In this example, as shown in Figures 1 and 3, we will describe a case where the main girder 21 is composed of a pre-girder (plate girder) with reinforcing ribs 21d attached to an H-shaped steel having an upper flange 21a, a lower flange 21b, and a web 21c. However, various known steel materials can be used for the main girder 21.

[0019] The total length of the main girder 21 may be such that it can be erected across both sections 20a and 20b, or it may be such that it is divided into separate spans for the rear ramp section 20a and the front installation section 20b. Multiple main girders 21 are erected along the bridge axis direction of the frame at a predetermined gradient, and are also arranged at appropriate intervals in the transverse direction of the frame.

[0020] <4> crossbeam As shown in Figure 4A, a transverse beam 23 is horizontally installed between the tops of several adjacent support piles 25. The transverse beam 23 is not mandatory and may be omitted. <5> Suspension frame In this invention, the heavy equipment crane 10 can be installed horizontally in the front installation section 20b by directly driving the heavy equipment crane 10 onto the suspension frame 30 installed at the front installation section 20b of the inclined platform 20.

[0021] The suspension frame 30 is a frame installed in the front installation section 20b of the inclined platform 20, and is suspended and attached between adjacent main girders 21, 21. In this example, a pair of suspension frames 30 are installed in parallel in the front installation section 20b of the inclined platform 20 to accommodate the width of the pair of left and right crawler tracks that make up the traveling body 11 of the heavy equipment crane 10.

[0022] <5.1> Example of suspension frame configuration The suspension frame 30 illustrated in this example comprises a pair of mounting plates 31, 31 for obtaining a reaction force from the main girder 21, a horizontal floor 32 positioned horizontally between adjacent main girders 21, 21, and a pair of suspension members 33, 33 that connect the sides of the mounting plates 31 and the horizontal floor 32 in the vertical direction.

[0023] In this example, the suspension frame 30 is constructed from steel plates, and a pair of mounting plates 31, 31, a horizontal floor 32, and a pair of suspension members 33, 33 are integrally joined to form a cross-sectional shape that is roughly hat-shaped. The components of the suspension frame 30 will be described in detail below.

[0024] <5.2> Mounting plate The mounting plate 31 is placed on the upper flange 21a of the main girder 21 and is detachable. In practice, the mounting plate 31 is fixed using fixing bolts 34 (Figure 3).

[0025] <5.3>Horizontal floor The horizontal floor 32 is a strip-shaped support material for placing the crawler-type mobile body 11 of the heavy equipment crane 10 on. The mounting plate 31 is formed to match the slope angle of the main girder 21, and the horizontal floor 32 is formed horizontally according to the inclination angle of the mounting plate 31.

[0026] The overall length of the horizontal floor 32 is such that the vehicle body 11 can move onto it, and the width of the horizontal floor 32 is such that the left and right pairs of crawlers constituting the vehicle body 11 can be individually placed on it.

[0027] Furthermore, the lifting platform 30 can also be configured to simultaneously mount a pair of left and right crawlers of the heavy equipment crane 10 onto a single horizontal floor 32.

[0028] <5.4> Hanging material The suspension member 33 is a load transmission member that transmits the load applied by the heavy equipment crane 10 to the horizontal floor 32 to the main girder 21 via the mounting plate 31, while maintaining the horizontal position of the horizontal floor 32. In this example, we describe a configuration in which the suspension member 33 is a steel plate, but the suspension member 33 is not limited to a steel plate and may be a rigid truss structure or the like.

[0029] [Method for adjusting the installation angle of heavy machinery cranes] Next, we will explain how to adjust the installation angle of the heavy equipment crane for constructing the inclined platform 20 with an upward slope.

[0030] <1> Preliminary work for the inclined platform As shown in Figure 4A, the rear ramp section 20a of the existing inclined platform 20 is covered with a covering plate 22, while the front installation section 20b has a suspension frame 30 installed instead of a covering plate 22. The covering plates 22 in the rear ramp section 20a have a predetermined gradient, and the covering plate 22 laid on the highest level is continuous with the horizontal floor 32 of the suspension frame 30 provided in the front installation section 20b.

[0031] <2> Heavy equipment crane entry operation Referring to Figure 4B, the operation of the heavy equipment crane 10 from the rear ramp section 20a to the lifting platform 30 installed in the front installation section 20b will be explained in detail below.

[0032] <2.1> Self-propelled section on the rear ramp After the heavy equipment crane 10's vehicle 11 enters the rear ramp section 20a on an uphill slope, it moves under its own power towards the front installation section 20b. The heavy equipment crane 10 travels on the covering plate 22 of the rear ramp section 20a while maintaining its inclined position.

[0033] <2.2> Transfer from the rear ramp section to the suspension platform When the heavy equipment crane 10 reaches the highest point of the rear ramp section 20a, the traveling body 11 of the heavy equipment crane 10 begins to move from the covering plate 22 toward the horizontal floor 32 of the lifting platform 30. When moving from the rear ramp section 20a onto the lifting platform 30, the heavy equipment crane 10 gradually changes from an upward tilted position to a horizontal position.

[0034] Since the covering plate 22 and the horizontal floor 32 of the lifting platform 30 that constitute the rear ramp section 20a are continuous, the heavy equipment crane 20 can smoothly transfer onto the lifting platform 30.

[0035] <2.3> Horizontal Self-Propelled Heavy Equipment Cranes The heavy equipment crane 10 moves forward while maintaining its horizontal position until it reaches the very front edge of the horizontal floor 32 and stops. The weight of the heavy equipment crane 10 is supported by multiple main girders 22 via a lifting frame 30.

[0036] <3> Construction work for the next span using heavy machinery cranes As previously described, the heavy equipment crane 10 is installed in a horizontal position (horizontal or nearly horizontal) on a suspension frame 30 provided in the front installation section 20b of the inclined platform 20. In other words, by using the suspension frame 30, the heavy equipment crane 10 can be positioned horizontally at the very front of the inclined platform 20.

[0037] Using a heavy equipment crane 10 installed in the front installation section 20b of the inclined platform 20, support piles 25 are driven into the ground in front of the existing inclined platform 20, and the main girders 21, cross girders 23, and lining body 22 are assembled to construct the rear ramp section 20a and the front installation section 20b that constitute the inclined platform 20 for the next span.

[0038] In this invention, the heavy equipment crane 10 can be horizontally installed in the front installation section 20b, which is the foremost part of the inclined platform 20. Therefore, construction can be carried out efficiently even when using a heavy equipment crane 10 with a smaller working radius compared to conventional methods.

[0039] <4> Overriding a heavy equipment crane Referring to Figures 4C and 4D, we will explain how the heavy equipment crane 10 moves from the existing span to the inclined platform 20 of the next span.

[0040] <4.1> Installation of the horizontal frame As shown in Figure 4C, once the construction of the next span of the inclined platform 20 is completed, a known horizontal support frame 40 is installed on the rear ramp section 20a of the inclined platform 20. At this time, the horizontal plane 41 of the uppermost surface of the horizontal frame 40 and the horizontal floor 32 of the suspension frame 30 are made to be at the same height.

[0041] <4.2> Horizontal retraction of heavy equipment cranes The heavy equipment crane 10 is moved backward and repositioned from the horizontal floor 32 of the lifting platform 30 to the horizontal surface 41 of the horizontal platform 40. By moving the heavy equipment crane 10 onto the horizontal stand 40, the lifting stand 30 becomes available.

[0042] <4.3> Removal of the suspension frame The lifting frame 30 is separated from the existing inclined platform 20, and the lifting frame 30 is removed using the heavy equipment crane 10, which has been moved onto the horizontal frame 40.

[0043] <4.4> Installation of covering plates When the suspension frame 30 is removed from the existing inclined platform 20, the main girder 21 is exposed within the front installation section 20b. As shown in Figure 4D, a covering plate 22 is laid over the entire area of ​​the exposed front installation section 20b to secure a travel surface for the heavy equipment crane 10. The existing inclined platform 20 is completely covered with a covering plate 22 from the rear end installation section 20a to the front end installation section 20b.

[0044] <4.5> Travel and movement of heavy machinery cranes The heavy equipment crane 10 travels along the existing inclined platform 20, which is entirely covered with a covering plate 22, and moves to the inclined platform 20 of the next span. The above steps are repeated to sequentially extend the inclined platform 20.

[0045] During the extension work of the inclined platform 20, the suspension frame 30 and the horizontal frame 40 are removed and reused for each span. Note that the horizontal support frame 40 is not mandatory, and if the horizontal support frame 40 is omitted, the heavy equipment crane 10 may be moved backward from the horizontal floor 32 of the suspension frame 30 onto the covering plate 22 of the rear ramp section 20a.

[0046] [Example 2] <1> Other suspension frames Refer to Figures 5A and 5B to describe the other suspension frames 30a. The suspension frame 30a in this example is similar to the previous embodiment 1 in that it comprises a pair of mounting plates 31, 31 for obtaining a reaction force from the main girder 21, a horizontal floor 32 positioned between adjacent main girders 21, 21, and suspension members 33 that connect the sides of each mounting plate 31 and the horizontal floor 32 in the vertical direction. However, in this example, the length of the suspension members 33 is made adjustable.

[0047] The length of the suspension member 33 is made adjustable in order to install the horizontal floor 32 horizontally without being affected by the slope of the inclined platform 20.

[0048] The suspension member 33 is, for example, composed of multiple suspension bolts 35. Multiple suspension bolts 35 are connected across the sides of the mounting plate 31 and the horizontal floor 32, and the suspension length of the horizontal floor 32 can be adjusted by rotating the suspension bolts 35 attached to the horizontal floor 32. The number and spacing of the suspension bolts 35 can be selected as appropriate.

[0049] <2> The effect of this example In this example, in addition to the effects of Embodiment 1 described above, the horizontality of the horizontal floor 32 can be ensured by simply adjusting the hanging length of the suspension member 33 (suspension bolt 35) without being affected by the slope of the inclined platform 20.

[0050] [Example 3] <1> Other suspension frames Refer to Figure 6 to describe the other suspension frames 30b. In this example, the suspension frame 30b is constructed by positioning a horizontal floor 32 horizontally between a pair of main girders 21, 21, and fixing both the left and right ends of the horizontal floor 32 to the webs 21c, 21c of the main girders 21, 21. As means of securing the horizontal floor 32, welding, bolting, etc., can be applied. In this example, the load of the heavy equipment crane 10 acting on the horizontal floor 32 is directly transmitted to and supported by the main girders 21, 21.

[0051] <2> The effect of this example In this example, the mounting plate 31 and suspension member 33, as in the previous embodiment 1, can be omitted, allowing the suspension frame 30b to be manufactured economically.

[0052] [Example 4] The above describes a configuration in which one suspension frame 30 (30a, 30b) is installed on a single-span inclined platform 20. However, it is also possible to install multiple suspension frames 30 (30a, 30b) in series on a single-span inclined platform 20. [Explanation of symbols]

[0053] 10. Heavy machinery crane 11. Heavy equipment crane vehicle 20... Slanted gantry 20a...Rear ramp section of the inclined platform 20b...Front installation section of the inclined platform 21...Main girder 21a...Upper flange 21b...Lower flange 21c...Web 21d... Reinforcement ribs 22. Covering plate 23...Horizontal girder 25...Support pile 30..Hanging frame 30a, 30b... Suspension frame 31. Mounting plate 32...Horizontal floor 33...hanging material 34. Fixing bolts 35. Suspension bolts 40.....Horizontal mounting base 50... Horizontal mounting base

Claims

1. A sloping platform having an upward slope in the bridge axis direction, on which a self-propelled heavy equipment crane can travel, comprises a plurality of support piles erected at a predetermined span, a plurality of main girders erected between the heads of the plurality of support piles, a plurality of covering plates stretched across the upper surfaces of adjacent main girders, and a detachable suspension frame that can be installed between adjacent main girders, It has a rear ramp section adjacent to the bridge axis direction and a front installation section located above the rear ramp section. In the aforementioned rear ramp section, multiple covering plates are laid on the upper surfaces of adjacent main girders. The aforementioned front installation section is suspended by being stretched across the upper surfaces of adjacent main girders, and is capable of being replaced by a suspension frame that allows the traveling body of the heavy machinery crane to move over, and by multiple covering plates that can be laid on the upper surfaces of adjacent main girders. The aforementioned suspension frame comprises at least a horizontal floor positioned horizontally between adjacent main girders, The aforementioned horizontal floor is continuous with the covering plate of the rear ramp section. A key feature is that when a lifting platform is installed in the aforementioned front mounting section, the heavy equipment crane can be mounted horizontally by driving it onto the horizontal floor of the lifting platform from the aforementioned rear ramp section. Structure of an inclined platform.

2. The structure of an inclined platform according to claim 1, characterized by comprising a plurality of suspension frames that can be installed between adjacent main girders.

3. The structure of an inclined platform according to claim 1 or 2, characterized in that the suspension platform comprises a pair of mounting plates for obtaining a reaction force from adjacent main girders, a horizontal floor positioned horizontally between adjacent main girders, and a pair of suspension members connecting the sides of the mounting plates and the horizontal floor in the vertical direction.

4. The structure of the inclined platform according to claim 3, characterized in that the pair of suspension members are made of steel that cannot be adjusted in length.

5. The structure of the inclined platform according to claim 3, characterized in that the pair of suspension members are composed of a plurality of suspension bolts whose length can be adjusted.

6. The structure of an inclined platform according to claim 3, characterized in that the main girder is an H-shaped steel, and the mounting plate of the suspension frame is detachably attached to the upper flange of the H-shaped steel.

7. A method for adjusting the installation angle of a heavy machinery crane on an inclined platform, which has an upward slope in the bridge axis direction and uses a suspension platform that allows a self-propelled heavy machinery crane to enter, wherein the heavy machinery crane is installed in a horizontal position on the inclined platform, The aforementioned inclined platform has a rear ramp section adjacent to the bridge axis direction and a front installation section located above the rear ramp section. In the aforementioned rear ramp section, multiple covering plates are laid on the upper surfaces of adjacent main girders of the inclined platform. The aforementioned front installation section is suspended by being stretched across the upper surfaces of adjacent main girders, and is capable of being replaced by a suspension frame that allows the traveling body of the heavy machinery crane to move over, and by multiple covering plates that can be laid on the upper surfaces of adjacent main girders. The aforementioned suspension frame comprises at least a horizontal floor positioned horizontally between adjacent main girders, The horizontal floor of the suspension frame installed in the aforementioned front installation section and the covering plate attached to the aforementioned rear ramp section are made continuous. The heavy equipment crane is characterized by ascending the ramp section of the inclined platform, then moving onto the horizontal floor of the suspension platform installed in the front installation section, and then installing the heavy equipment crane in a horizontal position. A method for adjusting the installation angle of a heavy equipment crane on an inclined platform.

8. The method for adjusting the installation angle of a heavy equipment crane on an inclined platform according to claim 7, characterized in that the suspension platform comprises a pair of mounting plates for obtaining a reaction force from adjacent main girders, a horizontal floor positioned horizontally between adjacent main girders, and a pair of suspension members connecting the sides of the mounting plates and the horizontal floor in the vertical direction.

9. A method for adjusting the installation angle of a heavy equipment crane on an inclined platform according to claim 8, characterized in that the pair of suspension members are made of steel members whose length cannot be adjusted.

10. A method for adjusting the installation angle of a heavy equipment crane on an inclined platform according to claim 8, characterized in that a pair of the aforementioned suspension members are composed of a plurality of suspension bolts whose length can be adjusted.

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