Hydropower station underground gate shaft maintenance stair passage closing facility

Abstract

A hydropower station underground gate shaft maintenance stair channel closing facility comprises channel steel, expansion bolts, double-nut bolts and a steel plate. The length of the channel steel is smaller than that of the long side of an orifice, and a phi 25mm hole is drilled in a web of the channel steel and fixed on the side wall through a first expansion bolt; phi-18mm holes are uniformly drilled in channel steel wing plates and staggered with web plate holes, and double-cap bolts penetrate through the wing plate holes and then are welded and fixed. Holes with the diameter phi being 16 mm are drilled in the side beams, second expansion bolts are embedded in the holes, and the holes in the two sides of the hyacinth-bean-shaped riffled plate correspond to the side beams and channel steel wing plate hole positions and are provided with lifting ring installation holes and rectangular lifting rings. And one side of the steel plate is connected with the side beam through a second expansion bolt, and the other side is connected with the channel steel through a double-nut bolt to fill the orifice to realize closing. According to the facility, efficient sealing is achieved through common materials, rapid dismounting and repeated mounting can be achieved, universality is high, safety is high, and the facility is suitable for the flexible sealing requirement of the hydropower station underground gate shaft overhaul channel.

Description

Technical Field

[0001] This utility model belongs to the field of water conservancy and hydropower engineering, specifically relating to a closed facility for the maintenance staircase passage of an underground gate well in a hydropower station. Background Technology

[0002] Due to terrain limitations, the spillway tunnels, venting tunnels, and power plant buildings of hydropower stations often need to be located underground. These underground structures are generally quite high in height and often require various openings to be set up in layers. During construction, these openings often serve as access channels for construction personnel or engineering materials. After the power station is completed and put into operation, some openings lose their function and can be permanently sealed. Other openings may still need to be used during maintenance after the power station is put into operation. Although they are not permanently sealed, their usage frequency is low.

[0003] For orifices that may still be used during power plant operation, the fall height is generally high, requiring appropriate safety measures. Some power plants, to reduce operating costs, use fences to enclose the orifices and paint the area around them with conspicuous safety colors to prevent personnel from entering. However, this practice still poses certain safety hazards and may occupy other workspaces. Other power plants use hydraulic or electric automatic gates to seal the orifices. These gates are highly secure and easy to use, but require custom manufacturing, resulting in high costs, complex installation, and the need for regular maintenance. Still other power plants use steel plates and angle steel edging for welding and sealing. When needed for use, the steel plates are cut off, and after use, they are re-welded. This sealing method is low-cost, but requires cutting equipment for use and welding equipment for restoration, limiting its usability. Utility Model Content

[0004] This utility model provides a sealing facility for the maintenance staircase passage of underground gate wells in hydropower stations. The purpose is to effectively seal the openings that may still be used during operation, and to allow them to be quickly opened when needed in the future. After use, the facility can be reinstalled and reused.

[0005] A sealing facility for the maintenance staircase passage of an underground gate shaft in a hydropower station, characterized by comprising a channel steel, expansion bolts, double-headed bolts, and a steel plate. The length of the channel steel is less than the length of the long side of the maintenance staircase passage opening. Holes are drilled in the side wall of the maintenance passage opening at 500mm intervals, and first expansion bolts are driven into the holes. Holes with a diameter of φ25mm are drilled in the web of the channel steel at 500mm intervals. Holes with a diameter of φ18mm are evenly drilled in the flanges on both sides of the channel steel, with the holes in the flanges corresponding to each other and staggered from the holes in the web. The first expansion bolts are inserted through the holes in the web of the channel steel to install the channel steel on the side wall of the maintenance passage opening. The double-headed bolts are inserted through the holes in the flanges, and the lower bolts are tightened. The motherboard is welded to the channel steel. Holes with a diameter of φ16mm are drilled on the side beam of the maintenance passage opening, with the hole spacing corresponding to the hole positions on the channel steel flange. Second expansion bolts are embedded. Two holes with a diameter greater than φ16mm are drilled on each side of the lentil-shaped patterned steel plate, with the positions corresponding to the drilling positions on the side beam of the maintenance passage opening and the channel steel flange, respectively. Four lifting ring mounting holes with a diameter of approximately φ20mm are drilled on both sides of the steel plate at a distance of 1 / 4 from the edge. The reinforcing bars are bent into rectangular lifting rings and fixed in the lifting ring mounting holes. One side of the steel plate is connected to the side beam of the maintenance passage opening through the second expansion bolt, and the other side is connected to the flange of the channel steel through double-headed bolts. Several steel plates are used to cover and seal the maintenance staircase passage opening.

[0006] Furthermore, the channel steel is type 16A and made of Q235A material.

[0007] Furthermore, the first expansion bolt is an M24 type with a length of 500mm; the second expansion bolt is an M16 type with a length of 300mm; and the double-headed bolt is an M16 type with a length of 250mm.

[0008] The beneficial effects of this utility model are as follows: By combining commonly used engineering materials such as channel steel, bolts, and steel plates, the orifice can be sealed safely and efficiently. The required materials are readily available in engineering, making implementation convenient and highly versatile. By selecting components of appropriate specifications, the sealed orifice can withstand a certain load. In subsequent special circumstances where the orifice needs to be opened, simply use a wrench to remove the nuts of the expansion bolts, lift the lifting ring, and remove the steel plate. After the orifice is used, lift the lifting ring, lower the steel plate, and tighten the nuts to complete the orifice sealing. Furthermore, this facility provides good sealing for maintenance stair passages in underground gate shafts. With adjustments to the dimensions or components, it can be used to seal maintenance stair passages in most underground gate shafts of hydropower stations, making it highly valuable for widespread application. Attached Figure Description

[0009] Figure 1 This is a plan view of the enclosed access system for the maintenance staircase passageway in the underground gate chamber of a hydroelectric power station.

[0010] Figure 2 This is the longitudinal section diagram 2-2.

[0011] Figure 3 This is a cross-sectional view of section 3-3.

[0012] Figure 4 This is a cross-sectional view of section 4-4.

[0013] Figure 5 This is a detailed drawing of the lifting rings.

[0014] Among them: 1-channel steel, 2-second expansion bolt, 3-double cap bolt, 4-steel plate, 5-lifting ring, 6-first expansion bolt, 7-side beam of maintenance access opening, 8-side wall of maintenance access opening. Detailed Implementation

[0015] Example 1: A closed passageway for maintenance stairs in an underground gate shaft of a hydropower station, characterized in that it includes channel steel 1, expansion bolts, double-headed bolts 3, and steel plate 4. The facility is installed through the following procedures:

[0016] S1, remove the steps, handrails, and railings that extend above the floor slab in the original stairwell passageway.

[0017] S2, Drill holes in the side wall 8 of the inspection passage opening, with a hole spacing of 500mm, and drive in the first expansion bolt 6 after drilling.

[0018] S3. Select a 2.6m long, 16A type, Q235A channel steel 1, and drill 6 holes with a diameter of φ25mm on its web plate, with a hole spacing of 500mm.

[0019] S4. Drill 8 holes with a diameter of φ18mm evenly on each of the flanges on both sides of the channel steel 1. The positions of the holes on the flanges on both sides should correspond and be staggered from the holes on the web by a certain distance.

[0020] S5, insert the first expansion bolt 6 into the hole in the web of the channel steel 1, install the channel steel 1 on the side wall 8 of the maintenance passage opening through the first expansion bolt 6, insert the double-cap bolt 3 into the hole on the flange, and weld the nut below to the channel steel 1 to prevent the double-cap bolt 3 from falling off.

[0021] S6. Drill 8 holes with a diameter of φ16mm on the side beam 7 of the maintenance passage opening, with the spacing corresponding to the hole positions on the two side flanges of the channel steel 1, and embed the second expansion bolts 2.

[0022] S7. Take four lentil-shaped patterned steel plates 4, each with dimensions of 720mm*890mm and a thickness of 8mm. Drill two holes with a diameter greater than φ16mm on each side of each plate, corresponding to the holes on the side beam 7 of the maintenance passage opening and the wing plate of the channel steel 1. Drill four lifting ring mounting holes with a diameter of φ20mm at a position 1 / 4 of the distance from the edge on both sides of the steel plate 4.

[0023] S8, bend the steel bar into a U-shape and insert it into the lifting ring mounting hole on the steel plate 4. Then, bend the steel bar further into a rectangle and weld the end to seal it into a closed rectangular lifting ring 5.

[0024] S9. Use the lifting ring 5 to lift the steel plate and place it in the corresponding position of the opening. Align the openings on both sides with the holes on the side beam 7 of the maintenance passage opening and the flange of the channel steel 1 respectively. Tighten the nuts on the second expansion bolt 2 and the double-headed bolt 4 in sequence to install the steel plate 4 firmly.

Claims

1. A closed passageway for maintenance staircases in underground gate shafts of hydropower stations, characterized in that: The components include channel steel, expansion bolts, double-headed bolts, and steel plates. The length of the channel steel is less than the long side of the access opening for the maintenance staircase. Holes are drilled in the side wall of the access opening at 500mm intervals. After drilling, the first expansion bolt is driven in. Holes with a diameter of φ25mm are drilled in the web of the channel steel at 500mm intervals. Holes with a diameter of φ18mm are drilled evenly on the flanges on both sides of the channel steel. The positions of the holes on the flanges correspond and are staggered from the holes on the web. The first expansion bolts are inserted through the holes in the web of the channel steel to install the channel steel on the side wall of the access opening. The double-headed bolts are inserted through the holes in the flanges, and the nuts below are welded to the channel steel. Holes with a diameter of φ16mm are drilled on the side beam, with the hole spacing corresponding to the hole positions on the channel steel wing plate. Second expansion bolts are embedded in the holes. Two holes with a diameter greater than φ16mm are drilled on each side of the lentil-shaped patterned steel plate, with the positions corresponding to the drilling positions on the side beam of the maintenance passage opening and the channel steel wing plate, respectively. Four lifting ring mounting holes with a diameter of approximately φ20mm are drilled on both sides of the steel plate at a position 1 / 4 of the distance from the edge. The reinforcing bars are bent into rectangular lifting rings and fixed in the lifting ring mounting holes. One side of the steel plate is connected to the side beam of the maintenance passage opening through the second expansion bolt, and the other side is connected to the wing plate of the channel steel through double-headed bolts. Several steel plates are used to cover and seal the maintenance staircase passage opening.

2. The enclosure facility for the maintenance staircase passage of an underground gate shaft in a hydropower station as described in claim 1, characterized in that... The channel steel is type 16A and made of Q235A material.

3. The enclosure facility for the maintenance staircase passage of an underground gate shaft in a hydropower station as described in claim 1, characterized in that... The first expansion bolt is M24 type and 500mm in length; the second expansion bolt is M16 type and 300mm in length; the double-headed bolt is M16 type and 250mm in length.

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