A pressure steel pipe weld maintenance bearing platform system and its use method

Abstract

The present invention relates to the technical field of penstock maintenance equipment, and provides a penstock weld maintenance bearing platform system and a method for use thereof, wherein the penstock weld maintenance bearing platform system includes a hoisting mechanism installed on the ground, a fixed structure installed at the inlet of a water diversion tunnel, a first diverting pulley provided on the fixed structure, a bearing mechanism provided in the penstock, and a steel wire rope having one end connected to the bearing mechanism and the other end bypassing the first diverting pulley and vertically passing upward through the maintenance gate slot and then connected to the hoisting mechanism; the hoisting mechanism can pull the bearing mechanism to move in the penstock via the steel wire rope. The present invention can conveniently perform maintenance on the inclined section of the penstock, and is applicable to the maintenance of both the inclined section and the horizontal section, thereby improving maintenance efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of penstock repair equipment, and in particular to a penstock weld repair bearing platform system and a use method thereof. Background Art

[0002] As an important water-transporting and pressure-bearing component of a hydropower station, the penstock is the core focus of hidden danger inspection. The traditional penstock weld inspection and repair construction method is to build a scaffolding platform, hang the scaffolding platform into the penstock, and the maintenance personnel stand on the scaffolding platform to perform maintenance work. However, the penstocks of some hydropower stations are Figure 1 As shown, it has an inclined section and a horizontal section. The traditional scaffolding platform is suitable for the maintenance of the horizontal section. For the inclined section, due to the inclination of the pipe wall, the traditional scaffolding platform cannot meet the maintenance needs of the inclined section. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention designs a pressure steel pipe weld maintenance bearing platform system and a use method.

[0004] The present invention is achieved through the following technical solutions: a penstock weld inspection and maintenance platform system, comprising a hoisting mechanism installed on the ground, a fixed structure installed at the inlet of a water diversion tunnel, a first diverting pulley provided on the fixed structure, a supporting mechanism provided in the penstock, and a steel wire rope having one end connected to the supporting mechanism and the other end passing around the first diverting pulley and vertically upward through the inspection gate slot, and then connected to the hoisting mechanism; the hoisting mechanism can pull the supporting mechanism to move in the penstock via the steel wire rope;

[0005] The bearing mechanism includes two inverted triangular support frames arranged in parallel, an inclined section maintenance bearing platform installed on the top of the two inverted triangular support frames, and rollers installed on the two inverted triangular support frames respectively; when the bearing mechanism moves along the inclined section of the pressure steel pipe, the inclined section maintenance bearing platform remains in a horizontal state, and the rollers are in contact with the lower half of the pressure steel pipe.

[0006] Furthermore, the inverted triangle support frame includes a first diagonal brace, a second diagonal brace and a top horizontal reinforcement rib which are interconnected and form an inverted triangle shape; the inclined section maintenance support platform is installed on the top horizontal reinforcement ribs of the two inverted triangle support frames, and the roller is arranged on the first diagonal brace.

[0007] The inclined section maintenance support platform includes a first support platform, a second support platform and a third support platform respectively installed on the top of two inverted triangular support frames; the heights of the first support platform, the second support platform and the third support platform increase successively so that a staircase shape is formed between the first support platform, the second support platform and the third support platform.

[0008] A horizontal section maintenance bearing platform is also connected between the two inverted triangle support frames. When the bearing mechanism moves from the inclined section of the pressure steel pipe to the horizontal section, the horizontal section maintenance bearing platform switches from an inclined state to a horizontal state.

[0009] The horizontal section maintenance support platform includes a fourth support platform, a fifth support platform and a sixth support platform; the heights of the fourth support platform, the fifth support platform and the sixth support platform are successively reduced so that the fourth support platform, the fifth support platform and the sixth support platform are in the shape of stairs.

[0010] A rotating shaft located below the inclined section maintenance bearing platform is also connected between the two inverted triangle support frames, and a hanging basket is provided on the rotating shaft. When the supporting mechanism moves in the pressure steel pipe, the hanging basket always remains in a vertical state under the action of its own gravity; manholes are provided on the inclined section maintenance bearing platform and the horizontal section maintenance bearing platform, and a cover plate is provided on the manhole.

[0011] The carrying mechanism is provided with a driving mechanism for driving the roller to rotate.

[0012] The fixing structure includes a cross steel plate and a fixing column arranged on the cross steel plate; the cross steel plate is fixed at the inlet of the water diversion tunnel, the fixing column extends toward the pressure steel pipe, and the first steering pulley is installed at the end of the fixing column.

[0013] A method for using a penstock weld maintenance carrying platform system, which uses the penstock weld maintenance carrying platform system to perform maintenance on the penstock, comprising the following steps:

[0014] (A) Build the penstock weld maintenance bearing platform system, and locate the bearing mechanism at the entrance of the inclined section of the penstock. The maintenance personnel will board the inclined section maintenance bearing platform;

[0015] (B) Control the hoisting mechanism to move the bearing mechanism slowly downward along the inclined section of the penstock. Each time the bearing mechanism moves to a weld position, the hoisting mechanism stops working, and the maintenance personnel inspect the welds in the inclined section on the inclined section maintenance platform;

[0016] (C) When the carrying mechanism moves to the end of the inclined section, the hoisting mechanism is controlled to stop working, and the maintenance personnel open the cover on the inclined section maintenance platform and enter the hanging basket through the manhole on the inclined section maintenance platform;

[0017] (D) Restart the hoisting mechanism, and the bearing mechanism slowly moves from the inclined section of the penstock into the horizontal section. At this time, the maintenance personnel open the cover on the horizontal section maintenance bearing platform and step onto the horizontal section maintenance bearing platform;

[0018] (E) Control the driving mechanism to make the bearing mechanism move slowly along the horizontal section of the penstock. Every time the bearing mechanism moves to a weld position, the driving mechanism stops working and the maintenance personnel inspect the welds in the horizontal section on the horizontal section maintenance bearing platform.

[0019] Furthermore, in step (D), after the supporting mechanism enters the horizontal section from the inclined section of the penstock, the steel wire rope is separated from the supporting mechanism.

[0020] Compared with the prior art, the embodiments of the present application have the following beneficial effects: the present invention can conveniently inspect and repair the inclined section of the pressure steel pipe, and is applicable to the inspection and repair of both the inclined section and the horizontal section, thereby improving the inspection and repair efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The exemplary embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation of the present application. In each figure, the same reference numerals represent the same components.

[0022] Figure 1 Schematic diagram of the penstock.

[0023] Figure 2 This is a schematic diagram of the present invention when installed in a penstock.

[0024] Figure 3 This is a structural diagram of the carrying mechanism of the present invention when no horizontal section maintenance carrying platform is provided.

[0025] Figure 4 It is a top view of the inclined section maintenance bearing platform of the present invention.

[0026] Figure 5 for Figure 2 Enlarged schematic diagram of point A in the middle.

[0027] Figure 6 It is a structural schematic diagram of the fixing structure of the present invention.

[0028] Figure 7 This is a structural schematic diagram of the carrying mechanism of the present invention when a horizontal section maintenance carrying platform is provided.

[0029] Figure 8 It is a schematic diagram of the bearing mechanism of the present invention entering the horizontal section from the inclined section of the pressure steel pipe.

[0030] Figure 9 for Figure 8 Enlarged schematic diagram of point B in the middle.

[0031] Figure 10 for Figure 8 Enlarged schematic diagram of point C in the middle.

[0032] The figure marks in the above drawings are: 1-maintenance gate slot, 2-fixed structure, 3-first diverting pulley, 4-second diverting pulley, 5-bearing mechanism, 6-first diagonal brace, 7-second diagonal brace, 8-middle horizontal reinforcement rib, 9-vertical reinforcement rib, 10-top horizontal reinforcement rib, 11-first bearing platform, 12-second bearing platform, 13-third bearing platform, 14-support rod, 15-roller, 16-pressure steel pipe, 17-steel wire rope, 18-manhole, 19-cross steel plate, 20-fixed column, 21-fourth bearing platform, 22-fifth bearing platform, 23-sixth bearing platform, 24-hanging basket, 25-rotating shaft. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0034] It should be noted that, if the description and claims of the present application and the above-mentioned drawings relate to the terms "first", "second", etc., they are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein. In addition, if the terms "including" and "having" and any of their variations are involved, it is intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] In this application, when terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inside," "outside," "center," "vertical," "horizontal," "transverse," and "longitudinal" are used, the orientations or positional relationships they indicate are based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0036] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0037] Furthermore, in this application, the terms "installed," "disposed," "provided with," "connected," "connected," and "socketed" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0038] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0039] Example

[0040] like Figure 2 As shown, this embodiment discloses a penstock weld maintenance bearing platform system, which includes a hoisting mechanism installed on the ground, a fixed structure 2 installed at the inlet of the water diversion tunnel, a first diverting pulley 3 arranged on the fixed structure 2, a bearing mechanism 5 arranged in the penstock 16, and a wire rope 17 with one end connected to the bearing mechanism 5 and the other end bypassing the first diverting pulley 3 and vertically passing through the maintenance gate slot 1 upward and then connected to the hoisting mechanism.

[0041] The hoisting mechanism uses a wire rope 17 to pull the load-carrying mechanism 5 within the penstock 16. Specifically, the hoisting mechanism includes a motor, a reduction gearbox, a drum, a brake, a controller, and other components. One end of the wire rope 17 is wound around the drum. The motor drives the drum forward and reverse to retract and extend the wire rope 17, thereby pulling the load-carrying mechanism 5 within the penstock 16. The hoisting mechanism is a mature existing technology, and its structure and operating principle are not described in detail. In this embodiment, the hoisting mechanism is located on the ground for easy maintenance.

[0042] The diversion tunnel is used to install the penstock 16, such as Figure 6As shown, the fixed structure 2 includes a cross steel plate 19 and a fixed column 20 arranged on the cross steel plate 19. During installation, the cross steel plate 19 is stuck at the entrance of the water diversion tunnel, the fixed column 20 extends toward the pressure steel pipe 16, and the first diverting pulley 3 is installed at the end of the fixed column 20. After passing through the first diverting pulley 3, the wire rope 17 passes upward from the vertical maintenance gate slot 1 to the ground and is connected to the hoisting mechanism on the ground. The first diverting pulley 3 plays a guiding role, which can convert the inclined tension of the wire rope 17 into a vertical upward tension. In specific implementation, a second diverting pulley 4 can also be set at the entrance of the pressure steel pipe 16, and the wire rope 17 passes through the second diverting pulley 4.

[0043] like Figure 3 、 4 As shown, the bearing mechanism 5 includes two parallel inverted triangular support frames, an inclined section maintenance bearing platform installed at the top of the two inverted triangular support frames, and rollers 15 respectively installed on the two inverted triangular support frames. When the hoisting mechanism controls the bearing mechanism 5 to move within the inclined section of the pressure steel pipe 16, the rollers 15 contact the lower half of the pressure steel pipe 16 under the action of the weight of the bearing mechanism 5, as shown in FIG. Figure 3 In addition, the laying angle of the inclined section maintenance platform must satisfy the requirement that when the supporting mechanism 5 moves along the inclined section of the pressure steel pipe 16, the inclined section maintenance platform always remains horizontal, as shown in FIG. Figure 3 As shown, when the carrying mechanism 5 moves along the inclined section, the maintenance personnel can stand on the maintenance carrying platform of the inclined section to inspect the welds in the inclined section, as shown in FIG. Figure 5 shown.

[0044] like Figure 3 As shown, the inverted triangular support frame includes a first diagonal brace 6, a second diagonal brace 7, and a top horizontal reinforcement rib 10, which are interconnected and form an inverted triangular shape. The inclined section maintenance support platform is mounted on the top horizontal reinforcement ribs 10 of the two inverted triangular support frames, and the roller 15 is mounted on the first diagonal brace 6; that is, the two ends of the inclined section maintenance support platform are respectively mounted on the top horizontal reinforcement ribs 10 of the two inverted triangular support frames.

[0045] In addition, a central horizontal reinforcement rib 8 is connected between the first and second diagonal braces 6 and 7, and a vertical reinforcement rib 9 is connected between the top horizontal reinforcement rib 10 and the central horizontal reinforcement rib 8. The central horizontal reinforcement rib 8 and vertical reinforcement rib 9 enhance the stability of the inverted triangular support frame. Accordingly, a reinforcement rib can be connected between the two inverted triangular support frames to further enhance their stability.

[0046] like Figure 3As shown, the inclined section maintenance platform includes a first platform 11, a second platform 12, and a third platform 13, respectively mounted on the tops of two inverted triangular support frames. During installation, the ends of the second platform 12 and the third platform 13 are respectively mounted on the horizontal reinforcement ribs 10 at the tops of the two inverted triangular support frames via support rods 14 of different lengths. This causes the heights of the first platform 11, the second platform 12, and the third platform 13 to increase sequentially, forming a staircase-like pattern between the first platform 11, the second platform 12, and the third platform 13. Because the inclined section of the penstock 16 is tilted, the welds between the pipe sections lie on an inclined plane. In other words, the annular welds between the pipe sections are higher at one end than at the other. Furthermore, the large diameter of the penstock 16 makes the welds at the top difficult to inspect. In this embodiment, a staircase-like pattern is formed between the first platform 11, the second platform 12, and the third platform 13. This allows maintenance personnel to inspect different parts of the annular welds while standing on different platforms, facilitating operation. During installation, ladders can be set up between the supporting platforms on different levels for people to go up and down.

[0047] In addition, the edges of the first loading platform 11, the second loading platform 12 and the third loading platform 13 can be set to be arc-shaped so that the projections of the first loading platform 11, the second loading platform 12 and the third loading platform 13 form a circle to better match the shape of the pressure steel pipe 16. In this way, maintenance personnel standing on the inclined section maintenance loading platform can perform comprehensive maintenance on the pressure steel pipe 16, such as Figure 4 When setting up, the size of the inclined section maintenance support platform must meet the requirements of maintaining a certain distance between its edges and the wall of the pressure steel pipe 16 to prevent the wall from being scratched when the support mechanism moves. However, the distance between the two cannot be too large to prevent people or tools from falling through the gap. Specifically, it can be set to 15-20CM.

[0048] In order to make this embodiment applicable to the maintenance of both the inclined section and the horizontal section of the pressure steel pipe 16, as another implementation method, Figure 7 As shown, a horizontal section maintenance bearing platform is also connected between the two inverted triangle support frames. When the bearing mechanism 5 moves in the inclined section of the pressure steel pipe 16, the horizontal section maintenance bearing platform is in an inclined state. When the bearing mechanism 5 moves from the inclined section of the pressure steel pipe 16 to the horizontal section, the horizontal section maintenance bearing platform switches from the inclined state to the horizontal state, so that maintenance personnel can stand on the flat section maintenance bearing platform to inspect the welds in the horizontal section, while the inclined section maintenance bearing platform is switched from the horizontal state to the inclined state.

[0049] Specifically, the horizontal section maintenance platform includes a fourth platform 21, a fifth platform 22, and a sixth platform 23. The fourth platform 21 and the fifth platform 22 are respectively connected to the second diagonal brace 7 and the top horizontal reinforcement rib 10, and the sixth platform 23 is connected to the second diagonal brace 7 and the middle horizontal reinforcement rib 8. The heights of the fourth platform 21, the fifth platform 22, and the sixth platform 23 are successively reduced, so that the fourth platform 21, the fifth platform 22, and the sixth platform 23 form a staircase shape. Maintenance personnel can inspect various parts of the weld located on the vertical plane in the horizontal section by standing on different platforms.

[0050] In addition, a rotating shaft 25 located below the inclined section maintenance platform is connected between the two inverted triangular support frames, and a hanging basket 24 is installed on the rotating shaft 25. Specifically, the rotating shaft 25 is connected between the vertical reinforcement ribs 9 of the two inverted triangular support frames. The rotating shaft 25 can rotate. Therefore, when the supporting mechanism 5 moves in the penstock 16, the hanging basket 24 always remains in a vertical state under the action of its own weight.

[0051] Correspondingly, the inclined section maintenance support platform and the horizontal section maintenance support platform are both provided with a manhole 18, and the manhole 18 is provided with a cover. Maintenance personnel can go down to the hanging basket 24 through the manhole 18 on the inclined section maintenance support platform, and can also go up to the horizontal section maintenance support platform from the manhole 18 on the flat section maintenance support platform. The cover is used to cover the manhole 18. When the cover is closed, the inclined section maintenance support platform and the horizontal section maintenance support platform form a complete platform, which can prevent maintenance personnel from accidentally falling from the manhole 18. The cover can be set on the first support platform 11 and the fifth support platform 22. The cover is provided with a latch, which is fixed by the latch when closed, and the cover can be opened from the top and bottom. When setting, a man ladder can also be provided on the inverted triangle support frame to facilitate maintenance personnel to go down from the inclined section maintenance support platform to the hanging basket 24, and also to facilitate maintenance personnel to go up from the hanging basket 24 to the horizontal section maintenance support platform. Of course, a ladder can also be provided on the inverted triangle support frame to facilitate maintenance personnel to go down from the hanging basket 24 to the bottom of the penstock, that is, when in the horizontal section, maintenance personnel can go up and down the carrying mechanism 5 from the ladder.

[0052] Furthermore, the support mechanism 5 is provided with a drive mechanism for rotating the rollers 15. The drive mechanism includes components such as a motor, gears, and a reduction gearbox. This drive mechanism can be used to drive the support mechanism 5 within the horizontal section. The drive mechanism for rotating the rollers to move the platform is conventional, and its structure and operating principle will not be described in detail. During installation, a cable for powering the drive mechanism can be pulled from the ground, and a separate winch mechanism can be used to synchronously coordinate the movement of the support mechanism 5 within the penstock by retracting and releasing the cable. This method is relatively common and will not be described in detail.

[0053] The method for repairing the penstock 16 using the penstock weld repair platform system includes the following steps:

[0054] (A) Build the penstock weld maintenance bearing platform system, and place the bearing mechanism 5 at the entrance of the inclined section of the penstock 16. Maintenance personnel carry maintenance tools and board the inclined section maintenance bearing platform through the bracket built at the entrance of the inclined section.

[0055] (B) The hoisting mechanism is controlled to slowly move the support mechanism 5 downward along the inclined section of the penstock 16. During the downward movement, each time the support mechanism 5 reaches a weld, the hoisting mechanism is controlled to stop, and maintenance personnel can inspect the weld within the inclined section from the inclined section maintenance platform. Specifically, the hoisting mechanism can be controlled by personnel on the ground, who can communicate with maintenance personnel inside the penstock 16 via intercom.

[0056] (C) After the weld inspection within the inclined section is completed, when the support mechanism 5 moves to the end of the inclined section, the inclined section inspection platform remains horizontal, and the horizontal section inspection platform remains tilted. The hoist mechanism is controlled to stop working, and the maintenance personnel then open the cover on the inclined section inspection platform and enter the hanging basket 24 through the manhole 18 on the inclined section inspection platform. Specifically, the hoist mechanism can be equipped with a meter that records the length of the released wire rope. When the released wire rope length matches the length of the inclined section, the personnel will determine that the support mechanism 5 has moved to the end of the inclined section. Of course, the maintenance personnel can also notify ground personnel that the support mechanism 5 has moved to the end of the inclined section.

[0057] (D) After the maintenance personnel enter the hanging basket 24, they restart the hoisting mechanism. Under the action of gravity, the carrying mechanism 5 continues to move downward and slowly enters the horizontal section from the inclined section of the pressure steel pipe 16. At this time, the inclined section maintenance bearing platform changes from a horizontal state to an inclined state, and the horizontal section maintenance bearing platform changes from an inclined state to a horizontal state. During this process, the hanging basket 24 always remains in a vertical state, and the maintenance personnel can stay in the hanging basket safely. Figure 7 、 Figure 8 、 Figure 9 Of course, during the entire maintenance process, the maintenance personnel are equipped with safety belts. After the carrying mechanism 5 enters the horizontal section, the maintenance personnel open the cover on the horizontal section maintenance bearing platform and step onto the horizontal section maintenance bearing platform.

[0058] (E) After the supporting mechanism 5 enters the horizontal section, the driving mechanism is controlled to operate so that the supporting mechanism 5 moves slowly along the horizontal section of the pressure steel pipe 16. Every time the supporting mechanism 5 moves to a weld position, the driving mechanism is controlled to stop working, and the maintenance personnel inspect the weld in the horizontal section on the horizontal section maintenance platform.

[0059] When the maintenance is completed, the carrying mechanism 5 is controlled to move toward the inclined section. When the carrying mechanism 5 moves to the end of the horizontal section, the driving mechanism is controlled to stop working, and the maintenance personnel go down from the horizontal section maintenance bearing platform to the hanging basket 24. Then the hoisting mechanism pulls the carrying mechanism 5 so that the carrying mechanism 5 enters the inclined section from the horizontal section. Finally, the maintenance personnel climb onto the inclined maintenance bearing platform from the hanging basket 24. The steps are opposite to those when the carrying mechanism 5 enters the horizontal section from the inclined section; the carrying mechanism 5 is continued to be pulled so that the carrying mechanism 5 returns to the upper end of the pressure steel pipe.

[0060] Alternatively, in step D, after the support mechanism 5 enters the horizontal section from the inclined section of the penstock 16, the wire rope 17 can be disconnected from the support mechanism 5, and the drive mechanism can be used to drive the support mechanism 5 along the horizontal section. This prevents the support mechanism 5 from being affected by the wire rope during its movement along the horizontal section. When returning, when the support mechanism 5 reaches the end of the horizontal section, the wire rope 17 is reconnected to the support mechanism 5, and the winch mechanism can then be used to pull the support mechanism 5 up the climb.

[0061] This embodiment can conveniently perform maintenance on the inclined section of the penstock, and is applicable to the maintenance of both the inclined section and the horizontal section, thereby improving maintenance efficiency.

[0062] It should be noted that all features disclosed in this specification, or steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, can be combined in any manner.

[0063] Furthermore, the above-described specific embodiments are merely illustrative. Persons skilled in the art may devise various solutions based on the disclosure of the present invention, and such solutions fall within the scope of the present invention and are intended to be protected by the present invention. Persons skilled in the art should understand that the present description and drawings are intended to be illustrative and not to limit the scope of the claims. The scope of protection of the present invention is defined by the claims and their equivalents.

Claims

1. A method for using a penstock weld maintenance platform system, characterized in that: The penstock (16) is overhauled using the penstock weld overhaul platform system, comprising the following steps: (A) Constructing a penstock weld maintenance bearing platform system; wherein the penstock weld maintenance bearing platform system comprises a hoisting mechanism installed on the ground, a fixed structure (2) installed at the inlet of a water diversion tunnel, a first diverting pulley (3) arranged on the fixed structure (2), a bearing mechanism (5) arranged in the penstock (16), and a steel wire rope (17) having one end connected to the bearing mechanism (5) and the other end passing around the first diverting pulley (3) and vertically passing through the maintenance gate slot (1) upwards and then connected to the hoisting mechanism; the hoisting mechanism can pull the bearing mechanism (5) to move in the penstock (16) through the steel wire rope (17); The bearing mechanism (5) comprises two inverted triangular support frames arranged in parallel, an inclined section maintenance bearing platform installed at the top ends of the two inverted triangular support frames, a horizontal section maintenance bearing platform arranged between the two inverted triangular support frames, and rollers (15) respectively installed on the two inverted triangular support frames; when the bearing mechanism (5) moves along the inclined section of the pressure steel pipe (16), the inclined section maintenance bearing platform maintains a horizontal state, and the rollers (15) contact the lower half of the pressure steel pipe (16); and when the bearing mechanism (5) moves from the inclined section to the horizontal section of the pressure steel pipe (16), the horizontal section maintenance bearing platform switches from the inclined state to the horizontal state; The horizontal section maintenance platform includes a fourth platform (21), a fifth platform (22) and a sixth platform (23); the heights of the fourth platform (21), the fifth platform (22) and the sixth platform (23) are successively lowered so that the fourth platform (21), the fifth platform (22) and the sixth platform (23) are arranged in a stair-like shape; A rotating shaft (25) located below the inclined section maintenance bearing platform is further connected between the two inverted triangle support frames, and a hanging basket (24) is provided on the rotating shaft (25). When the carrying mechanism (5) moves in the pressure steel pipe (16), the hanging basket (24) always maintains a vertical state under the action of its own gravity; a manhole (18) is provided on the inclined section maintenance bearing platform and the horizontal section maintenance bearing platform, and a cover plate is provided on the manhole (18); a driving mechanism for driving the roller (15) to rotate is provided on the carrying mechanism (5); After the pressure steel pipe weld maintenance bearing platform system is built, the bearing mechanism (5) is located at the entrance of the inclined section of the pressure steel pipe (16), and the maintenance personnel board the inclined section maintenance bearing platform; (B) controlling the operation of the hoisting mechanism so that the bearing mechanism (5) slowly moves downward along the inclined section of the pressure steel pipe (16). Each time the bearing mechanism (5) moves to a weld position, the hoisting mechanism stops working, and the maintenance personnel inspect the weld in the inclined section on the inclined section maintenance bearing platform; (C) When the carrying mechanism (5) moves to the end of the inclined section, the hoisting mechanism is controlled to stop working, and the maintenance personnel open the cover on the inclined section maintenance carrying platform and enter the hanging basket (24) through the manhole (18) on the inclined section maintenance carrying platform; (D) Restart the hoisting mechanism, and the bearing mechanism (5) slowly moves from the inclined section of the pressure steel pipe (16) into the horizontal section. At this time, the maintenance personnel open the cover on the horizontal section maintenance bearing platform and climb onto the horizontal section maintenance bearing platform; (E) The driving mechanism is controlled to drive the roller (15) to rotate, so that the bearing mechanism (5) moves slowly along the horizontal section of the pressure steel pipe (16). Each time the bearing mechanism (5) moves to a weld position, the driving mechanism stops working, and the maintenance personnel inspect the weld in the horizontal section on the horizontal section maintenance bearing platform.

2. The method for using the pressure steel pipe weld maintenance bearing platform system according to claim 1 is characterized in that: In step (D), after the supporting mechanism (5) enters the horizontal section from the inclined section of the pressure steel pipe (16), the steel wire rope (17) is separated from the supporting mechanism (5).

3. The method for using the pressure steel pipe weld maintenance bearing platform system according to claim 1 is characterized in that: The inverted triangle support frame comprises a first diagonal brace (6), a second diagonal brace (7) and a top horizontal reinforcement rib (10) which are interconnected and form an inverted triangle shape; the inclined section maintenance bearing platform is mounted on the top horizontal reinforcement ribs (10) of the two inverted triangle support frames, and the roller (15) is arranged on the first diagonal brace (6).

4. The method for using the pressure steel pipe weld maintenance bearing platform system according to claim 1 is characterized in that: The inclined section maintenance support platform comprises a first support platform (11), a second support platform (12) and a third support platform (13) respectively mounted on the top of two inverted triangle support frames; the heights of the first support platform (11), the second support platform (12) and the third support platform (13) increase successively so that a staircase shape is formed between the first support platform (11), the second support platform (12) and the third support platform (13).

5. The method for using the pressure steel pipe weld maintenance bearing platform system according to claim 1 is characterized in that: The fixed structure (2) comprises a cross steel plate (19) and a fixed column (20) arranged on the cross steel plate (19); the cross steel plate (19) is fixed at the inlet of the water diversion tunnel, the fixed column (20) extends in the direction of the pressure steel pipe (16), and the first diverting pulley (3) is installed at the end of the fixed column (20).

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