A self-propelled operating platform for cable-stayed bridge bottom construction and its installation method

Abstract

The jack-up gantry crane is connected to the jack-up gantry crane by means of a movable frame and a movable frame arranged on both sides of the movable frame, wherein the movable frame is hung on both sides of the main beam of the bridge, and the movable frame is movably connected to both sides of the main beam of the bridge; the movable truss comprises a platform truss and a supporting truss arranged at both ends of the platform truss, and the walking mechanism is arranged on the top of the supporting truss; there is a construction reserved space between the platform truss and the bottom of the bridge, and the supporting truss is provided with a limiting mechanism that contacts the side of the main beam of the bridge; compared with the existing technology, through the setting of the limiting mechanism, during the movement of the movable truss, the top and side of the bridge are in contact with the walking mechanism and the limiting mechanism at the same time, ensuring that the movable truss does not move laterally during the movement, and while supporting the operating layer, ensuring that the center of gravity of the operating layer is located in the middle of the operating layer, so that the operating layer has better stability during the movement, thereby having better safety performance.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and in particular to a self-propelled operating platform for bottom construction of a cable-stayed bridge and an installation method thereof. Background Art

[0002] During the construction of a cable-stayed bridge with concrete main beams, as the main beam segments are gradually poured, daily inspections and construction work on the bottom of the concrete beams need to be carried out step by step. For example, surface repairs and cleaning of cement slurry on the bottom of the beams, repairs and sealing of cable guide holes, and later prestressing of the side span and mid-span closure bundles and track welding of the beam bottom inspection trolley all require a construction platform.

[0003] In the existing technology, an ordinary truss-type operating platform is usually made of steel sections at the construction site, which is supported on the top surface of the main beam concrete by hooks. When moving, it is dragged by a winch. This operating platform cannot be dismantled and recycled, and the safety risk of dragging it with a winch is high.

[0004] Chinese patent number CN212533727U discloses a bridge beam bottom inspection platform, which includes a working platform, a bridge deck walking mechanism and a cantilever connecting mechanism. The working platform is placed horizontally at the bottom of the bridge for inspecting the beam bottom. The bridge deck walking mechanism is movably mounted on the bridge deck and supported by the cantilever connecting mechanism to connect the opposite ends of the working platform; the working platform includes a first platform truss and a second platform truss, and the first platform truss and the second platform truss have different length specifications; the opposite ends of the first platform truss can be connected to one end of another first platform truss or one end of the second platform truss, and the opposite ends of the second platform truss can be connected to one end of another second platform truss or one end of the first platform truss; the first platform truss and the second platform truss both include two lower chords arranged parallel to each other, and a pedal for workers to step on is laid between the two lower chords.

[0005] The bridge beam bottom inspection platform disclosed above moves the positions of the first platform truss and the second platform truss along the length direction of the bridge, and realizes the first platform truss and the second platform truss through universal wheels. This makes it easy for the first platform truss and the second platform truss to cause deflection of the universal wheels during movement, and causes accumulation of deflection during the movement of the universal wheels, so there is a risk of the first platform truss and the second platform truss falling off, posing a certain safety hazard. Summary of the Invention

[0006] The present invention aims to overcome the above-mentioned defects in the prior art and provides a self-propelled operating platform and installation method for the construction of the bottom of concrete cable-stayed bridges, which is suitable for surface repair and cleaning of cement slurry at the bottom of the beam of cable-stayed bridges, repairing and sealing the cable guide holes of the cable-stayed cables, and performing prestressing of the side span closure bundles and the mid-span closure bundles in the later stage, and rail welding operations of the beam bottom inspection trolley.

[0007] In order to achieve the above-mentioned purpose of the invention, the present invention adopts the following technical solutions: a self-propelled operating platform for the bottom construction of a cable-stayed bridge, comprising a mobile truss and a traveling mechanism arranged on both sides of the mobile truss, the mobile truss being hung on both sides of the bridge main beam, and the traveling mechanism being movably connected to both sides of the bridge main beam; the mobile truss comprising a platform truss and supporting trusses arranged at both ends of the platform truss, the traveling mechanism being arranged on the top of the supporting truss; there is a reserved construction space between the platform truss and the bottom of the bridge, and the supporting truss is provided with a limiting mechanism in contact with the side of the bridge main beam.

[0008] As a preferred solution of the present invention, the platform truss is horizontally arranged, the supporting trusses are relatively arranged at both ends of the platform truss, and the supporting trusses are vertically arranged upward along the top of the platform truss.

[0009] As a preferred solution of the present invention, the oppositely arranged supporting trusses are located on both sides of the bridge, the traveling mechanism is arranged inside the supporting trusses, and the traveling mechanism is movably connected to the bridge surface.

[0010] As a preferred solution of the present invention, the platform truss includes an operating layer and a stabilizing layer connected to each other, the operating layer is horizontally arranged on the top of the stabilizing layer, and the bottom of the stabilizing layer is a pointed-angle structure.

[0011] As a preferred solution of the present invention, the operating layer is composed of two parallel beams located at the same horizontal height, and a longitudinal beam and a diagonal brace connected to each other are provided between the two beams.

[0012] As a preferred solution of the present invention, the stabilizing layer is composed of a stabilizing beam and a connecting rod. The stabilizing beam is arranged parallel to the bottom of the two horizontal beams, and the stabilizing beam is located on the center line of the two horizontal beams. The connecting rod is connected to both sides of the stabilizing beam, and the connecting rod is connected to the two horizontal beams. There is also an inclined rod arranged obliquely between the two horizontal beams and the stabilizing beam.

[0013] As a preferred solution of the present invention, the supporting truss includes a plurality of vertical rods and cross rods connected between adjacent vertical rods.

[0014] As a preferred solution of the present invention, the walking mechanism includes a walking frame and a directional wheel connected to the bottom of the walking frame. The bottom of the walking frame is provided with at least two directional wheels, and the directional wheels are provided with a connected drive motor.

[0015] As a preferred solution of the present invention, the traveling bracket and the supporting truss are fixedly connected via a flange, and an inclined reinforcement rod is further provided between the traveling bracket and the supporting truss.

[0016] As a preferred solution of the present invention, the limiting mechanism includes a limiting seat connected to the inner side of the supporting truss and a limiting wheel rotatably connected to the limiting seat, and the limiting wheel is in contact with the side surface of the bridge main beam.

[0017] A method for installing a self-propelled operating platform for bottom construction of a cable-stayed bridge comprises the following steps:

[0018] Step A: Measure the width of the bridge deck of the main beam, design the corresponding movable truss size according to the width of the bridge deck, draw the corresponding drawings, manufacture each component according to the drawings in the factory, and transport it to the site for assembly;

[0019] Step B: Assemble the platform truss and support truss on site. The platform truss and support truss are fixedly connected by bolts and flanges. The distance between the two support trusses at both ends of the platform truss is greater than the width of the bridge deck of the bridge main beam.

[0020] Step C: Hoist the assembled platform truss and support truss, and lift the top of the support truss to above the bridge deck of the bridge main beam;

[0021] Step D: Splice the walking bracket to the inner side of the oppositely arranged support truss, fix the walking bracket and the support truss with bolts and flanges, and install the directional wheels and drive motor at the bottom of the walking bracket;

[0022] Step E: Lower the platform truss and support truss as a whole so that the directional wheels at the bottom of the two walking supports are in contact with the bridge decks on both sides of the bridge main beam at the same time;

[0023] Step F: Install the limiting mechanisms on the inner sides of the two supporting trusses, and place the limiting wheels of the two limiting mechanisms against the two side surfaces of the bridge main beam respectively;

[0024] Step G: The driving motor drives the directional wheel to rotate, thereby driving the walking frame, the platform truss and the supporting truss to move along the rotation direction of the directional wheel.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. By setting the limiting mechanism, the top and side of the bridge are in contact with the traveling mechanism and the limiting mechanism at the same time during the movement of the mobile truss, ensuring that the mobile truss does not move laterally during the movement;

[0027] 2. While supporting the operating layer, ensure that the center of gravity of the operating layer is located in the middle of the operating layer, so that the operating layer has better stability during movement and thus better safety performance;

[0028] 3. The driving motor drives the directional wheel to rotate, thereby driving the mobile truss to move, avoiding the risk of being dragged by the winch. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the present invention;

[0030] Figure 2 It is a front view of the present invention;

[0031] Figure 3 is a side view of the present invention;

[0032] Figure 4 yes Figure 2 Sectional view of the AA plane;

[0033] Figure 5 yes Figure 2 Cross-sectional view of the middle BB surface;

[0034] Figure 6 It is a schematic diagram of the connection between the supporting truss and the traveling mechanism;

[0035] Figure 7 This is the main view of the platform truss;

[0036] Figure 8 yes Figure 7 Sectional view of the AA plane;

[0037] Figure 9 yes Figure 7 Cross-sectional view of the middle BB surface;

[0038] Figure 10 It is a structural diagram of the limiting mechanism;

[0039] Figure markings: platform truss 1, supporting truss 2, vertical rod 2-1, cross rod 2-2, bridge main beam 3, operating layer 4, cross beam 4-1, longitudinal beam 4-2, diagonal brace 4-3, stabilizing layer 5, stabilizing beam 5-1, connecting rod 5-2, tilting rod 5-3, walking mechanism 6, walking bracket 6-1, directional wheel 6-2, driving motor 6-3, limiting mechanism 7, limiting seat 7-1, limiting wheel 7-2, reinforcement rod 8, flange 9. DETAILED DESCRIPTION

[0040] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0041] like Figure 1-10As shown, a self-propelled operating platform for the bottom construction of a cable-stayed bridge includes a mobile truss and a traveling mechanism 6 arranged on both sides of the mobile truss. The mobile truss is hung on both sides of the bridge main beam 3, and the traveling mechanism 6 is movably connected to both sides of the bridge main beam 3; the mobile truss includes a platform truss 1 and support trusses 2 arranged at both ends of the platform truss 1, and the traveling mechanism 6 is arranged on the top of the support truss 2; there is a processing reserved space between the platform truss 1 and the bottom of the bridge 3, and the support truss 2 is provided with a limiting mechanism 7 that contacts the side of the bridge main beam 3.

[0042] The movable truss is arranged along the width direction of the bridge 3, and the traveling mechanism 6 drives the movable truss to move. Under the action of the traveling mechanism 6, the movable truss moves along the length direction of the bridge 3. The traveling mechanisms 6 on both sides of the bridge 3 move synchronously, and the stable movement of the movable truss is driven by the synchronous movement of the traveling mechanisms 6 on both sides of the bridge 3.

[0043] The reserved construction space between the platform truss 1 and the bottom of the bridge 3 is convenient for operators to stand, thereby making it convenient for operators to perform construction work on the bottom of the bridge 3.

[0044] The limiting mechanism 7 is always in contact with the side of the bridge 3 during the movement of the mobile truss, so that the relatively arranged supporting trusses 2 are all provided with a limiting mechanism 7, and the spacing between the relatively arranged limiting mechanisms 7 is consistent with the width of the bridge 3. Under the action of the limiting mechanism 7, the spacing between the side of the bridge 3 and the supporting truss 2 is always consistent, ensuring that the walking mechanism 6 is always located on the bridge 3.

[0045] The platform truss 1 is arranged horizontally, and the support truss 2 is arranged relatively at both ends of the platform truss 1, and the support truss 2 is arranged vertically upward along the top of the platform truss 1. The platform truss 1 and the support truss 2 form a semi-enclosed structure with the opening facing upward. The support truss 2 and the platform truss 1 are assembled and connected by bolts to achieve a fixed connection between the support truss 2 and the platform truss 1.

[0046] The oppositely arranged supporting trusses 2 are located on both sides of the bridge 3 , the traveling mechanism 6 is arranged inside the supporting trusses 2 , and the traveling mechanism 6 is movably connected to the surface of the bridge 3 .

[0047] The length of the platform truss 1 is designed according to the width of the bridge 3. At the same time, the spacing between the relatively arranged support trusses 2 is also designed according to the width of the bridge 3, ensuring that the limiting mechanism 7 on the relatively arranged support trusses 2 always contacts the side of the bridge 3, ensuring that the mobile truss does not move laterally during the walking process.

[0048] The platform truss 1 includes an operating layer 4 and a stabilizing layer 5 connected to each other. The operating layer 4 is horizontally arranged on the top of the stabilizing layer 5. The bottom of the stabilizing layer 5 has a pointed structure. The surface of the operating layer 4 is paved with a supporting layer for the operator to walk on, which can be a bamboo strip layer with a woven structure. The stabilizing layer 5 is used to reinforce the operating layer 4 while stabilizing the center of gravity of the operating layer 4 to ensure that the operating layer 4 has better stability during movement.

[0049] The operating layer 4 is composed of two parallel beams 4-1 located at the same horizontal height, and a connected longitudinal beam 4-2 and a diagonal brace 4-3 are provided between the two beams 4-1. The transverse beam 4-1, the longitudinal beam 4-2 and the diagonal brace 4-3 are located at the same horizontal height. The two ends of the longitudinal beam 4-2 are fixedly connected to the two transverse beams 4-1 by welding. The longitudinal beam 4-2 and the transverse beam 4-1 are arranged perpendicularly. The end of the diagonal brace 4-3 is connected to the connection between the longitudinal beam 4-2 and the transverse beam 4-1, and the diagonal brace 4-3 is fixedly connected to the longitudinal beam 4-2 and the transverse beam 4-1 by welding.

[0050] The stabilizing layer 5 is composed of a stabilizing beam 5-1 and a connecting rod 5-2. The stabilizing beam 5-1 is arranged parallel to the bottom of the two cross beams 4-1, and the stabilizing beam 5-1 is located on the center line of the two cross beams 4-1. The connecting rod 5-2 is connected to both sides of the stabilizing beam 5-1, and the connecting rod 5-2 is connected to the two cross beams 4-1. There is also an inclined rod 5-3 between the two cross beams 4-1 and the stabilizing beam 5-1.

[0051] The stabilizing beam 5-1 is consistent in length with the cross beam 4-1. The connecting rod 5-2 is used to connect the stabilizing beam 5-1 and the cross beam 4-1. The connecting rod 5-2 is fixedly connected to the stabilizing beam 5-1 and the cross beam 4-1 by welding. One end of the tilting rod 5-3 is fixedly connected to the connection between the stabilizing beam 5-1 and the connecting rod 5-2 by welding. The other end of the tilting rod 5-3 is fixedly connected to the connection between the cross beam 4-1 and the connecting rod 5-2 by welding. Under the action of the tilting rod 5-3, the connection between the stabilizing beam 5-1 and the cross beam 4-1 is divided into a triangular structure, making the connection between the stabilizing beam 5-1 and the cross beam 4-1 more stable.

[0052] The supporting truss 2 includes several vertical rods 2-1 and cross rods 2-2 connected between adjacent vertical rods 2-1. The supporting truss 2 includes four vertical rods 2-1, and the four vertical rods 2-1 correspond to the ends of two cross beams 4-1 and the ends of the outermost connecting rods 5-2 respectively. The cross rods 2-2 are fixedly connected between adjacent vertical rods 2-1 by welding, so that the overall supporting truss 2 has better stability.

[0053] The walking mechanism 6 includes a walking bracket 6-1 and a directional wheel 6-2 connected to the bottom of the walking bracket 6-1. At least two directional wheels 6-2 are provided at the bottom of the walking bracket 6-1. A drive motor 6-3 is connected to the directional wheel 6-2. The walking mechanism 6 also includes a walking gear and a differential. The walking gear is connected to the output shaft of the drive motor 6-3, and the rotation of the drive motor 6-3 drives the rotation of the walking gear. The walking gear is engaged with the differential, and the differential is connected to the directional wheel 6-2, thereby achieving deceleration of the output shaft of the drive motor 6-3 and realizing stable slow rotation of the directional wheel 6-2.

[0054] During the rotation of the directional wheel 6 - 2 , the traveling frame 6 - 1 , the supporting truss 2 and the platform truss 1 are driven to move along the rotation direction of the directional wheel 6 - 2 .

[0055] The walking bracket 6-1 and the supporting truss 2 are fixedly connected by a flange 9, on which corresponding bolts are provided. An inclined reinforcement rod 8 is also provided between the walking bracket 6-1 and the supporting truss 2. Both ends of the reinforcement rod 8 are fixedly connected to the walking bracket 6-1 and the supporting truss 2 by welding, thereby supporting the walking bracket 6-1 and the supporting truss 2.

[0056] The limiting mechanism 7 includes a limiting seat 7-1 connected to the inner side of the supporting truss 2 and a limiting wheel 7-2 rotatably connected to the limiting seat 7-1. The limiting wheel 7-2 is in contact with the side of the bridge main beam 3. The limiting seat 7-1 is fixedly connected to the supporting truss 2 by bolts or welding, and a rotating shaft compatible with the limiting wheel 7-2 is provided in the limiting seat 7-1.

[0057] In actual use, the following steps are included:

[0058] Step A: Measure the width of the bridge deck of the main beam 3 of the bridge, design the corresponding movable truss size according to the width of the bridge deck, draw the corresponding drawings, manufacture each component according to the drawings in the factory, and transport them to the site for assembly.

[0059] In the factory, the horizontal beam and vertical rod 2-1, cross rod 2-2, horizontal beam 4-1, longitudinal beam 4-2, diagonal brace 4-3, stabilizing beam 5-1, connecting rod 5-2 and inclined rod 5-3 are designed according to the actual required dimensions. The vertical rod 2-1 and the cross rod 2-2 are welded and fixed to form the supporting truss 2, the horizontal beam 4-1, longitudinal beam 4-2 and diagonal brace 4-3 are welded and fixed to form the operating layer 4, and the stabilizing beam 5-1, connecting rod 5-2 and inclined rod 5-3 are welded and fixed to form the stabilizing layer 5.

[0060] Step B: Assemble the platform truss 1 and the support truss 2 on site. The platform truss 1 and the support truss 2 are fixedly connected by bolts and flanges 9. The distance between the two support trusses 2 at both ends of the platform truss 1 is greater than the bridge deck width of the bridge main beam 3.

[0061] The operating layer 4 and the stabilizing layer 5 are welded and fixed to form segments of the platform truss 1 . The platform truss 1 is composed of multiple segments fixedly connected by bolts and flanges. The platform truss 1 is formed by splicing multiple segments.

[0062] The supporting truss 2 is fixedly connected to both ends of the platform truss 1 through bolts and flanges 9 , and the supporting truss 2 is vertically arranged on the platform truss 1 .

[0063] Step C: Hoist the assembled platform truss 1 and support truss 2, and lift the top of the support truss 2 to above the bridge deck of the bridge main beam 3. Since the distance between the two support trusses 2 at both ends of the platform truss 1 is greater than the bridge deck width of the bridge main beam 3, when the platform truss 1 is hoisted below the bridge main beam 3, the two support trusses 2 are located on both sides of the bridge deck of the bridge main beam 3.

[0064] Step D: Splice the walking bracket 6-1 to the inner side of the relatively arranged supporting truss 2. The walking bracket 6-1 and the supporting truss 2 are fixedly connected by bolts and flange 9, and fixed wheels 6-2 and drive motors 6-3 are installed at the bottom of the walking bracket 6-1. The distance between the two walking brackets 6-1 is less than the bridge deck width of the bridge main beam 3, and the two walking brackets 6-1 are located above the bridge deck of the bridge main beam 3. Even if the fixed wheels 6-2 slide outside the bridge deck of the bridge main beam 3, the two walking brackets 6-1 can still suspend and support the overall platform truss 1 and the supporting truss 2.

[0065] Step E: Lower the platform truss 1 and the supporting truss 2 as a whole, so that the directional wheels 6 - 2 at the bottom of the two walking supports 6 - 1 are in contact with the bridge decks on both sides of the bridge main beam 3 at the same time.

[0066] Step F: Install the limiting mechanism 7 on the inner side of the two supporting trusses 2, and respectively press the limiting wheels 7-2 of the two limiting mechanisms 7 against the two side surfaces of the bridge main beam 3. The limiting mechanisms 7 are respectively located on both sides of the bridge main beam 3, and the limiting wheels 7-2 of the limiting mechanisms 7 on both sides always press against the two sides of the bridge main beam 3 at the same time, thereby limiting the position of the walking mechanism 6 and having better safety.

[0067] Step G: The driving motor 6-3 drives the directional wheel 6-2 to rotate, thereby driving the walking frame 6-1, the platform truss 1 and the supporting truss 2 to move along the rotation direction of the directional wheel 6-2.

[0068] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is to be embodied in the widest possible manner consistent with the principles and novel features disclosed herein.

[0069] Although this document frequently uses the following terms in the figures: platform truss 1, support truss 2, vertical rod 2-1, cross rod 2-2, bridge main beam 3, operating layer 4, cross beam 4-1, longitudinal beam 4-2, diagonal brace 4-3, stabilizing layer 5, stabilizing beam 5-1, connecting rod 5-2, tilting rod 5-3, traveling mechanism 6, traveling support 6-1, directional wheel 6-2, driving motor 6-3, limiting mechanism 7, limiting seat 7-1, limiting wheel 7-2, reinforcing rod 8, flange 9, etc., the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A method for installing a self-propelled operating platform for bottom construction of a cable-stayed bridge, comprising a mobile truss and a traveling mechanism (6) arranged on both sides of the mobile truss, wherein the mobile truss is hung on both sides of the bridge main beam (3), and the traveling mechanism (6) is movably connected to both sides of the bridge main beam (3); characterized in that: The mobile truss comprises a platform truss (1) and support trusses (2) arranged at both ends of the platform truss (1), and a walking mechanism (6) is arranged on the top of the support truss (2); there is a processing reserved space between the platform truss (1) and the bottom of the bridge (3), and a limiting mechanism (7) is provided on the support truss (2) and contacts the side of the bridge main beam (3); the walking mechanism (6) comprises a walking bracket (6-1) and a directional wheel (6-2) connected to the bottom of the walking bracket (6-1), at least two directional wheels (6-2) are provided at the bottom of the walking bracket (6-1), and a driving motor (6-3) is connected to the directional wheel (6-2), and the walking bracket (6-1) and the support truss are connected. (2) are fixedly connected by a flange (9), and an inclined reinforcement rod (8) is further provided between the walking bracket (6-1) and the supporting truss (2); the limiting mechanism (7) comprises a limiting seat (7-1) connected to the inner side of the supporting truss (2) and a limiting wheel (7-2) rotatably connected to the limiting seat (7-1), and the limiting wheel (7-2) is in contact with the side of the bridge main beam (3); the limiting mechanism (7) is always in contact with the side of the bridge (3) during the movement of the moving truss, so that the supporting trusses (2) arranged relatively are all provided with limiting mechanisms (7), and the spacing between the limiting mechanisms (7) arranged relatively is consistent with the width of the bridge (3), comprising the following steps: Step A: Measure the width of the bridge deck of the main beam (3), design the corresponding movable truss size according to the width of the bridge deck, draw the corresponding drawings, manufacture each component in the factory according to the drawings, and transport it to the site for assembly; Step B: assembling the platform truss (1) and the supporting truss (2) on site, wherein the platform truss (1) and the supporting truss (2) are fixedly connected by bolts and flanges (9), and the spacing between the two supporting trusses (2) at both ends of the platform truss (1) is greater than the width of the bridge deck of the bridge main beam (3); Step C: hoisting the assembled platform truss (1) and the supporting truss (2), and hoisting the top of the supporting truss (2) above the bridge deck of the bridge main beam (3); Step D: splice the walking bracket (6-1) to the inner side of the oppositely arranged supporting truss (2), the walking bracket (6-1) and the supporting truss (2) are fixedly connected by bolts and flanges (9), and a directional wheel (6-2) and a driving motor (6-3) are installed at the bottom of the walking bracket (6-1), the spacing between the two walking brackets (6-1) is smaller than the width of the bridge deck of the bridge main beam (3), and the two walking brackets (6-1) are located above the bridge deck of the bridge main beam (3), even if the directional wheel (6-2) slides off the bridge deck of the bridge main beam 3, the two walking brackets (6-1) can still suspend and support the overall platform truss (1) and the supporting truss (2); Step E: Lower the platform truss (1) and the supporting truss (2) as a whole, so that the directional wheels (6-2) at the bottom of the two walking brackets (6-1) are in contact with the bridge decks on both sides of the bridge main beam (3) at the same time; Step F: Install the limiting mechanism (7) on the inner side of the two supporting trusses (2), and place the limiting wheels (7-2) of the two limiting mechanisms (7) against the two side surfaces of the bridge main beam (3); Step G: The driving motor (6-3) drives the directional wheel (6-2) to rotate, thereby driving the walking frame (6-1), the platform truss (1) and the supporting truss (2) to move along the rotation direction of the directional wheel (6-2).

2. The method for installing a self-propelled operating platform for bottom construction of a cable-stayed bridge according to claim 1, characterized in that: The platform truss (1) is arranged horizontally, the supporting trusses (2) are arranged relatively at both ends of the platform truss (1), and the supporting trusses (2) are arranged vertically upward along the top of the platform truss (1).

3. The method for installing a self-propelled operating platform for bottom construction of a cable-stayed bridge according to claim 2, characterized in that: The supporting trusses (2) are arranged opposite to each other and are located on both sides of the bridge (3). The walking mechanism (6) is arranged inside the supporting trusses (2), and the walking mechanism (6) is movably connected to the surface of the bridge (3).

4. The method for installing a self-propelled operating platform for bottom construction of a cable-stayed bridge according to claim 3, characterized in that: The platform truss (1) comprises an operating layer (4) and a stabilizing layer (5) connected to each other, the operating layer (4) is horizontally arranged on the top of the stabilizing layer (5), and the bottom of the stabilizing layer (5) is a pointed structure.

5. The method for installing a self-propelled operating platform for bottom construction of a cable-stayed bridge according to claim 4, characterized in that: The operating layer (4) is composed of two parallel beams (4-1) located at the same horizontal height, and a connected longitudinal beam (4-2) and a diagonal brace (4-3) are provided between the two beams (4-1).

6. The method for installing a self-propelled operating platform for bottom construction of a cable-stayed bridge according to claim 5, characterized in that: The stabilizing layer (5) is composed of a stabilizing beam (5-1) and a connecting rod (5-2). The stabilizing beam (5-1) is arranged parallel to and below the two cross beams (4-1), and the stabilizing beam (5-1) is located on the center line of the two cross beams (4-1). The connecting rod (5-2) is connected to both sides of the stabilizing beam (5-1), and the connecting rod (5-2) is connected to the two cross beams (4-1). An inclined rod (5-3) is also connected between the two cross beams (4-1) and the stabilizing beam (5-1).

7. The method for installing a self-propelled operating platform for bottom construction of a cable-stayed bridge according to claim 1, characterized in that: The supporting truss (2) comprises a plurality of vertical rods (2-1) and cross rods (2-2) connected between adjacent vertical rods (2-1).

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