Large-scale tailrace pipe maintenance platform sub girder of large-scale hydropower station

Abstract

The utility model relates to tail water pipe maintenance field, concretely discloses a large -scale hydroelectric station tail water pipe maintenance platform vice beam, including inner layer vice beam, outer layer vice beam, first connecting piece and second connecting piece, outer layer vice beam includes first outer layer fixed vice beam, outer layer detachable vice beam and second outer layer fixed vice beam connected in proper order, and the both ends of outer layer detachable vice beam are respectively with first outer layer fixed vice beam and second outer layer fixed vice beam and carry out detachable connection, and the connecting end of first outer layer fixed vice beam with outer layer detachable vice beam is welded with inner layer vice beam through first connecting piece, and the connecting end of second outer layer fixed vice beam with outer layer detachable vice beam is welded with inner layer vice beam through second connecting piece, and inner layer vice beam and outer layer vice beam are all in I -shape, the utility model discloses through detachable outer layer detachable vice beam, has solved the clearance of the existing maintenance platform to enter and exit tail water pipe and is narrow, makes the maintenance personnel easy to card main, leads to the maintenance personnel to enter and exit difficult, and the problem of existence security risk.

Description

Technical Field

[0001] This utility model relates to the field of tailrace pipe maintenance, and specifically discloses a secondary beam for a tailrace pipe maintenance platform of a large hydropower station. Background Technology

[0002] The tailrace of a large hydropower station is elbow-shaped, consisting of a conical section and an elbow section. A rounded rectangular access door, 800mm wide and 1000mm high, is installed in the conical section for maintenance personnel to enter and inspect equipment such as the turbine runner and tailrace. To ensure the safety of maintenance personnel, a 5.4m diameter maintenance platform must be erected on the conical section before entry. The platform mainly consists of a main beam 1, a secondary beam 2, side beams 3, a ramp 4, and a fixing frame 5. Figure 1 As shown.

[0003] Typically, maintenance personnel enter and exit the tailrace pipe by laying a rope ladder along the edge of the tailrace pipe lining near the access door, or by using an electric slingshot through an access hole in the middle of the tailrace pipe maintenance platform to enhance safety. However, using a rope ladder along the edge of the tailrace pipe lining near the access door is not suitable for all workers because climbing the ladder consumes a lot of energy, wasting the main effort on going up and down. Furthermore, using an electric slingshot through an access hole in the middle of the tailrace pipe maintenance platform requires significant modifications to the platform structure, which is difficult and may involve optimizing the main beam structure, posing a risk to platform stability. Therefore, currently, maintenance personnel enter and exit the tailrace pipe by removing a section of the ramp near the access door in the maintenance platform, and then using an electric slingshot through the gap between the platform's secondary beam and the tailrace pipe lining. Because the gap is small, only about 31cm, when a heavier maintenance worker carrying a safety belt, safety rope, tools, etc. passes through the gap, it may get stuck, making it difficult for the maintenance worker to go up or down. In severe cases, it may cause accidents such as being pinched or bumped. Utility Model Content

[0004] The purpose of this utility model is to provide a secondary beam for a maintenance platform of a large hydropower station tailrace pipe, which solves the problem that the existing maintenance platform has a narrow gap in the tailrace pipe, making it easy for maintenance personnel to get stuck, causing difficulties for maintenance personnel to enter and exit, and posing safety hazards.

[0005] The specific solution of this utility model is as follows:

[0006] A secondary beam for a maintenance platform of a large hydropower station tailrace pipe includes an inner secondary beam, an outer secondary beam, a first connector, and a second connector. The outer secondary beam includes a first outer fixed secondary beam, an outer detachable secondary beam, and a second outer fixed secondary beam connected in sequence. The two ends of the outer detachable secondary beam are detachably connected to the first outer fixed secondary beam and the second outer fixed secondary beam, respectively. The connection end of the first outer fixed secondary beam to the outer detachable secondary beam is welded to the inner secondary beam through the first connector. The connection end of the second outer fixed secondary beam to the outer detachable secondary beam is welded to the inner secondary beam through the second connector. Both the inner and outer secondary beams are I-shaped.

[0007] In some embodiments, the outer sub-beam further includes a plurality of fixing bolts and a plurality of fixing nuts that cooperate with the fixing bolts. At least one first fixing hole is provided on both ends of the outer detachable sub-beam. At least one second fixing hole that matches the first fixing hole is provided on the connection end of the first outer fixed sub-beam and the second outer fixed sub-beam that connects to the outer detachable sub-beam. The fixing bolt passes through the first fixing hole and the second fixing hole in sequence and is connected to the fixing nut.

[0008] In some embodiments, hooks are provided at both ends of the outer detachable sub-beam, and locking elements that cooperate with the hooks are provided at the connecting ends of the first and second outer fixed sub-beams to the outer detachable sub-beam. The outer detachable sub-beam is snapped to the first and second outer fixed sub-beams by the cooperation of the hooks and locking elements.

[0009] In some embodiments, the outer removable sub-beam is a steel outer removable sub-beam.

[0010] In some embodiments, stiffening plates are provided on the surfaces of the first outer fixed sub-beam and the second outer fixed sub-beam that are away from the inner sub-beam.

[0011] In some embodiments, the stiffeners are aluminum stiffeners.

[0012] In some embodiments, the thickness of the stiffener is 8 mm.

[0013] In some embodiments, symmetrical support columns are provided at the connection points of the first connector and the second connector with the inner sub-beam and the outer sub-beam, respectively.

[0014] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0015] 1. The sub-beam of this utility model includes an inner sub-beam and an outer sub-beam. The outer detachable sub-beam in the middle of the outer sub-beam is a detachable structure. By disassembling the outer detachable sub-beam, the gap between the sub-beam and the tailpipe lining can be increased, allowing maintenance personnel of all sizes to pass smoothly up and down through the gap, eliminating the phenomenon of maintenance personnel getting stuck, eliminating accidents such as pinching and bumping of maintenance personnel, and improving the safety of maintenance personnel.

[0016] 2. By adding stiffening plates to the first and second outer fixed sub-beams, the strength of the sub-beams can be increased, ensuring that the load-bearing capacity of the sub-beams remains unchanged after the outer removable sub-beams are disassembled, thus ensuring the reliability of the sub-beams. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the maintenance platform in this utility model.

[0018] Figure 2 This is a schematic diagram of the structure of the auxiliary beam of a maintenance platform for the tailrace pipe of a large hydropower station in an embodiment of this utility model.

[0019] Figure 3 This is a bottom view of the auxiliary beam of a large hydropower station tailrace pipe maintenance platform in an embodiment of this utility model.

[0020] Reference numerals: 1-Main beam, 2-Secondary beam, 3-Side beam, 4-Scaffolding, 5-Fixing clamp, 6-Gap, 21-Inner secondary beam, 22-Outer secondary beam, 221-First outer fixed secondary beam, 222-Outer detachable secondary beam, 223-Second outer fixed secondary beam, 23-First connector, 24-Second connector, 25-Stiffener, 26-Support column. Detailed Implementation

[0021] The specific implementation method is described below with reference to the accompanying drawings.

[0022] A secondary beam for a maintenance platform of the tailrace pipe of a large hydropower station, such as Figure 2 and Figure 3 As shown, it includes an inner sub-beam 21, an outer sub-beam 22, a first connector 23, and a second connector 24. The outer sub-beam 22 includes a first outer fixed sub-beam 221, an outer detachable sub-beam 222, and a second outer fixed sub-beam 223 connected in sequence. The two ends of the outer detachable sub-beam are detachably connected to the first outer fixed sub-beam 221 and the second outer fixed sub-beam 223, respectively. The connection end of the first outer fixed sub-beam to the outer detachable sub-beam is welded to the inner sub-beam 21 through the first connector 23. The connection end of the second outer fixed sub-beam to the outer detachable sub-beam is welded to the inner sub-beam 21 through the second connector 24. Both the inner sub-beam 21 and the outer sub-beam 22 are I-shaped.

[0023] Unlike existing single-layer H-beam aluminum sub-beams, the sub-beam of this invention adopts a double-layer H-beam aluminum structure. Both the inner sub-beam 21 and the outer sub-beam 22 are assembled from 110*60*5mm H-beam aluminum 6061-T6. The total length of the sub-beam is 2470mm. The inner sub-beam 21 is a single-piece H-beam aluminum structure, while the outer sub-beam is a detachable structure with a length of approximately 860mm. When maintenance personnel need to enter the tailrace pipe, the outer detachable sub-beam 222 can be temporarily removed, increasing the gap between the sub-beam and the tailrace pipe lining from 31cm to 46cm. This greatly facilitates the passage of maintenance personnel of all sizes, preventing them from getting stuck when passing through the gap and improving safety.

[0024] In some embodiments, the outer sub-beam 22 further includes a plurality of fixing bolts and a plurality of fixing nuts that cooperate with the fixing bolts. At least one first fixing hole is provided on both ends of the outer detachable sub-beam. At least one second fixing hole that matches the first fixing hole is provided on the connection end of the first outer fixed sub-beam 221 and the second outer fixed sub-beam that connects to the outer detachable sub-beam. The fixing bolt passes through the first fixing hole and the second fixing hole in sequence and is connected to the fixing nut.

[0025] By using fixing bolts and fixing nuts, the outer detachable sub-beam 222 can be quickly installed and removed from the first outer fixed sub-beam 221 and the second outer fixed sub-beam 223.

[0026] The present invention can have 4 fixing bolts and 4 fixing nuts. Two symmetrical first fixing holes are provided on both ends of the outer detachable sub-beam, that is, there are 4 first fixing holes. Two second fixing holes matching the first fixing holes are provided on the first outer fixed sub-beam, and two second fixing holes matching the first fixing holes are provided on the second outer fixed sub-beam, that is, there are 4 second fixing holes. The fixing bolts pass through the first fixing holes and the second fixing holes in sequence and are connected to the fixing nuts, thereby realizing the rapid installation of the outer detachable sub-beam 222 with the first outer fixed sub-beam 221 and the second outer fixed sub-beam 223 respectively.

[0027] In some embodiments, hooks are provided at both ends of the outer detachable sub-beam, and locking elements that cooperate with the hooks are provided at the connection ends of the first outer fixed sub-beam and the second outer fixed sub-beam to the outer detachable sub-beam. The outer detachable sub-beam 222 is snapped together with the first outer fixed sub-beam 221 and the second outer fixed sub-beam 223 by the cooperation of the hooks and the locking elements.

[0028] The combination of hooks and locking components enables quick installation and removal of the outer detachable sub-beam 222 from the first outer fixed sub-beam 221 and the second outer fixed sub-beam 223, making installation and removal simpler and more convenient.

[0029] In some embodiments, the outer removable sub-beam 222 is a steel outer removable sub-beam.

[0030] In some embodiments, stiffening plates 25 are provided on the surfaces of the first outer fixed sub-beam and the second outer fixed sub-beam that are away from the inner sub-beam.

[0031] Considering that the local stress on the outer sub-beam will increase after the outer removable sub-beam 222 is disassembled, stiffening plates 25 are added to the first and second outer fixed sub-beams to strengthen their strength and ensure their reliability. The stiffening plates 25 connect the upper and lower ends of the I-shaped first and second outer fixed sub-beams, further enhancing their strength.

[0032] In some embodiments, the stiffener 25 is an aluminum stiffener.

[0033] In some embodiments, the thickness of the stiffener is 8 mm.

[0034] In some embodiments, symmetrical support columns 26 are provided at the connection points of the first connector 23 and the second connector 24 with the inner sub-beam and the outer sub-beam, respectively.

[0035] The support column 26 makes the connection between the inner sub-beam and the outer sub-beam through the first and second connectors more stable, improving the stability and reliability of the sub-beam and ensuring the safe operation of maintenance personnel.

[0036] This utility model is not limited to the above embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model shall be included within the protection scope of this utility model.

Claims

1. A secondary beam for a maintenance platform of a large hydropower station's tailrace pipe, characterized in that: The device includes an inner sub-beam, an outer sub-beam, a first connector, and a second connector. The outer sub-beam comprises a first fixed outer sub-beam, a detachable outer sub-beam, and a second fixed outer sub-beam connected in sequence. Both ends of the detachable outer sub-beam are detachably connected to the first and second fixed outer sub-beams, respectively. The end of the first fixed outer sub-beam connected to the detachable outer sub-beam is welded to the inner sub-beam via the first connector. The end of the second fixed outer sub-beam connected to the detachable outer sub-beam is welded to the inner sub-beam via the second connector. Both the inner and outer sub-beams are I-shaped.

2. The auxiliary beam of the tailrace pipe maintenance platform for a large hydropower station according to claim 1, characterized in that: The outer sub-beam also includes multiple fixing bolts and multiple fixing nuts that cooperate with the fixing bolts. At least one first fixing hole is provided on both ends of the outer detachable sub-beam. At least one second fixing hole matching the first fixing hole is provided on the connection end of the first outer fixed sub-beam and the second outer fixed sub-beam that is connected to the outer detachable sub-beam. The fixing bolt passes through the first fixing hole and the second fixing hole in sequence and is connected to the fixing nut.

3. The auxiliary beam of the tailrace pipe maintenance platform for a large hydropower station according to claim 1, characterized in that: The outer detachable sub-beam is provided with hooks at both ends. The first outer fixed sub-beam and the second outer fixed sub-beam are respectively provided with locking parts that cooperate with the hooks at the connection ends with the outer detachable sub-beam. The outer detachable sub-beam is snapped to the first outer fixed sub-beam and the second outer fixed sub-beam by the cooperation of the hooks and the locking parts.

4. The auxiliary beam of the tailrace pipe maintenance platform for a large hydropower station according to claim 1, characterized in that: The outer detachable sub-beam is a steel outer detachable sub-beam.

5. The auxiliary beam of the tailrace pipe maintenance platform for a large hydropower station according to claim 2, characterized in that: The surfaces of the first and second outer fixed sub-beams that are away from the inner sub-beams are both provided with stiffening plates.

6. The auxiliary beam of the tailrace pipe maintenance platform for a large hydropower station according to claim 5, characterized in that: The stiffening plate is an aluminum stiffening plate.

7. The auxiliary beam of the tailrace pipe maintenance platform for a large hydropower station according to claim 5, characterized in that: The thickness of the stiffening plate is 8mm.

8. The auxiliary beam of the tailrace pipe maintenance platform for a large hydropower station according to claim 1, characterized in that: Symmetrical support columns are provided at the connection points of the first and second connectors with the inner sub-beam and the outer sub-beam, respectively.

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