Water inlet structure of pressure tunnel

Abstract

The invention provides a water inlet structure of a pressure tunnel, and relates to the technical field of hydraulic engineering, the upstream of the pressure tunnel is provided with a water diversion channel, the water inlet structure of the pressure tunnel comprises a drop well and a trash holding assembly, the drop well is arranged at the joint of the water diversion channel and the pressure tunnel, and the trash holding assembly is arranged in the drop well. A water inlet is formed in the end, close to the drop well, of the pressure tunnel, the drop well has the vertical depth and is communicated with the water inlet of the pressure tunnel from the side portion, and the difference between the sum of the vertical depth and the water depth of the water diversion channel and the hole diameter of the pressure tunnel is larger than or equal to the minimum submerging depth of the pressure tunnel. The trash holding assembly is arranged along the periphery of the well mouth of the drop well and used for preventing floating objects from entering the drop well. According to the device, it can be guaranteed that water flow in the water inlet is in a pressure flow state, and the small excavation volume and the floating object interception transverse size are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of water conservancy projects, and more particularly to an inlet structure of a pressurized tunnel. Background Art

[0002] As a common facility in water conservancy projects, pressurized tunnels are widely used in various water conservancy projects. To ensure that the water flow in the inlet of the pressurized tunnel is in a pressure flow state, the inlet of the pressurized tunnel needs to meet the requirement of reducing the elevation of the inlet bottom plate.

[0003] In related technologies, to meet the above requirements, a gradually varying slope section is usually set to reduce the elevation of the inlet bottom plate, thereby realizing the connection between the upstream water channel and the bottom of the pressurized tunnel. This leads to problems such as a sharp increase in the excavation volume and an expansion of the lateral dimension of the inlet trash rack building. Summary of the Invention

[0004] The problems to be solved by the present invention: In related technologies, the connection between the upstream water channel and the bottom of the pressurized tunnel is realized by setting a gradually varying slope section, which leads to a sharp increase in the excavation volume and an expansion of the lateral dimension of the inlet trash rack building.

[0005] To solve the above problems, the present invention provides an inlet structure of a pressurized tunnel. There is a diversion channel upstream of the pressurized tunnel. The inlet structure of the pressurized tunnel includes a drop well and a trash rack assembly. The drop well is arranged at the connection between the diversion channel and the pressurized tunnel. An inlet is provided at one end of the pressurized tunnel close to the drop well. The drop well has a vertical depth and communicates with the inlet of the pressurized tunnel from the side. The sum of the vertical depth and the water depth of the diversion channel minus the diameter of the pressurized tunnel is greater than or equal to the minimum submergence depth of the pressurized tunnel. The trash rack assembly is arranged along the periphery of the drop well opening and is used to prevent floating objects from entering the drop well.

[0006] Optionally, the drop well includes a drop side wall and a drop bottom plate. The drop side wall and the drop bottom plate enclose to form the drop well. The drop well is vertically embedded in the diversion channel, and the side of the drop well facing the pressurized tunnel is communicated with the inlet of the pressurized tunnel. The trash rack assembly is arranged on the top of the drop side wall.

[0007] Optionally, the drop side wall includes a first side wall and a second side wall. There are two second side walls which are arranged in parallel. The first side wall is arranged between the two second side walls. One end of each second side wall is fixedly connected to the first side wall, and the other end is respectively fixedly connected to the outer tunnel wall of the pressurized tunnel.

[0008] Optionally, the first side wall is parallel to the water flow direction, the second side wall is perpendicular to the water flow direction, the top of the drop side wall is flush with the bottom surface of the diversion channel, the top surface of the drop bottom plate is tangent to the inner bottom surface of the water inlet, and the vertical depth is the vertical distance between the top of the drop side wall and the top surface of the drop bottom plate.

[0009] Optionally, the trash rack assembly includes a second trash rack and trash rack piers. A plurality of the trash rack piers are vertically arranged at the top of the drop side wall and are spaced around the wellhead of the drop well, and the second trash rack is slidably arranged between every two adjacent trash rack piers.

[0010] Optionally, the second trash rack includes a front trash rack and a side trash rack. The front trash rack is arranged between every two adjacent trash rack piers on the first side wall, and the side trash rack is arranged between every two adjacent trash rack piers on the second side wall.

[0011] Optionally, both the front trash rack and the side trash rack include vertical beams, cross beams and guide members. A plurality of the vertical beams and the cross beams are respectively arranged and intersect at horizontal and vertical intervals, the guide members are respectively arranged on the vertical beams on both sides, and chutes are arranged on two adjacent trash rack piers, and the guide members are slidably matched with the chutes.

[0012] Optionally, the diversion channel includes a channel slope and a channel bottom plate which are connected to each other. Two channel slopes are provided and are respectively located on both sides of the channel bottom plate. The drop well is arranged at the connection between the channel bottom plate and the pressure tunnel. The top of the drop side wall is flush with the surface of the channel bottom plate, and the drop side wall is perpendicular to the channel bottom plate.

[0013] Optionally, the diversion channel is connected to the horizon through an excavation slope, and the excavation slope is separated by berms.

[0014] Optionally, it further includes a maintenance platform arranged on the trash rack piers. A lifting support assembly is arranged on the maintenance platform. The lifting support assembly is used for installing a lifting device. The lifting device is used for lifting the second trash rack. After the second trash rack is lifted, its bottom is clamped in the chute through the I-beam arranged on the trash rack pier.

[0015] The water intake structure of the pressure tunnel provided by the present invention, the design of the drop well enables the water flow to flow in from the upstream direction of the diversion channel and enter the pressure tunnel through the drop well. The drop well is arranged at the connection between the diversion channel and the pressure tunnel, and the drop well has a vertical depth. The sum of the vertical depth and the water depth of the diversion channel minus the diameter of the pressure tunnel is greater than or equal to the minimum submergence depth of the pressure tunnel, strictly ensuring that the water flow in the water intake is in a pressure flow state, improving the water conveyance capacity of the pressure tunnel, ensuring that the flow rate is controllable, and meeting the requirements of water supply, power generation, etc.; the drop well is vertically designed and communicates with the diversion channel and the pressure tunnel, then the reduced inlet elevation of the drop well is equal to the vertical depth, breaking through the limitation in the related technology that a slope section needs to be set to connect the diversion channel and the pressure tunnel, greatly shortening the horizontal projection length, and largely reducing the excavation volume; further, the drop well communicates with the water intake of the pressure tunnel from the side, then the drop well covers the pressure tunnel from one side of the water intake of the pressure tunnel, and the anti-pollution component is arranged along the periphery of the drop well. Then, the water flow with floating objects can not only pass through the anti-pollution component from the front direction parallel to the water flow and then enter the pressure tunnel through the drop well, but also be affected by the anti-pollution component from other directions (such as the side direction perpendicular to the water flow). Then, the floating objects can be intercepted in multiple directions along the periphery of the drop well, not only effectively preventing the floating objects from entering the pressure tunnel, but also being able to reduce the lateral dimension of the floating object interception equipment in the related technology, and also reducing the excavation and support requirements for the high slope area. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. shows the structural schematic diagram of the connection between the diversion channel and the pressure tunnel in the related technology.

[0017] Figure 2 FIG. shows the top view of the water intake structure in the related technology.

[0018] Figure 3 FIG. shows the structural schematic diagram of the water intake of the pressure tunnel in the embodiment of the present invention.

[0019] Figure 4 FIG. shows in the embodiment of the present invention Figure 3 Cross-sectional view A-A.

[0020] Figure 5 FIG. shows in the embodiment of the present invention Figure 4 Cross-sectional view B-B.

[0021] Figure 6 FIG. shows in the embodiment of the present invention Figure 4 Cross-sectional view C-C.

[0022] Figure 7 FIG. shows in the embodiment of the present invention Figure 4 Cross-sectional view D-D.

[0023] Figure 8 Shows a side view of the connection between the pressurized tunnel and the drop well in an embodiment of the present invention.

[0024] Figure 9 Shows a structural diagram of the cooperation between the forward trash rack and the trash rack pier in an embodiment of the present invention.

[0025] Figure 10 Shows a schematic diagram of the state where the forward trash rack is lifted from the trash rack pier in an embodiment of the present invention.

[0026] Figure 11 Shows a partial enlarged schematic diagram of an embodiment of the present invention Figure 10 in an embodiment of the present invention.

[0027] Description of reference numerals: 1. Gradual slope section; 2. First trash rack; 3. Horizontal section; 4. Pressurized tunnel; 5. Excavated slope; 6. Horizon; 7. Diversion channel; 71. Channel slope; 72. Channel bottom slab; 8. Drop well; 81. Drop well side wall; 82. Drop well bottom slab; 9. Water inlet; 10. Second trash rack; 101. Forward trash rack; 102. Lateral trash rack; 103. Trash rack pier; 111. Bent column; 112. Bent beam; 12. Maintenance platform; 13. Lifting equipment; 14. Access road; 15. Vertical beam; 16. Cross beam; 17. Guide; 18. I-beam; 19. Water inlet converging section. Detailed implementation manners

[0028] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following will describe in detail the specific embodiments of the present invention with reference to the accompanying drawings.

[0029] It should be noted that relational terms such as "first" and "second" in the present invention are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device including the said element.

[0030] In the description of this specification, the descriptions referring to terms such as "embodiment", "one embodiment", and "one implementation manner" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or implementation manner are included in at least one embodiment or exemplary implementation manner of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or implementation manner. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or implementation manners.

[0031] As Figure 1 and Figure 2 shown, in the related art, the connection between the diversion channel 7 and the pressure tunnel 4 is realized by setting a gradually changing slope section 1 with a slope of 1:5 - 1:10 and a horizontal section 3. The following is a specific introduction: 1. The maximum slope i of the allowed gradually changing slope section 1 ≤ 1:5. Among them, the horizontal projection length L of the slope section = Δh / i, where Δh represents the height (inlet elevation) of the gradually changing slope section 1. When Δh increases by 1 m, L increases by 5 m, and at the same time, the opening width of the excavation section increases significantly, and the excavation volume surges; 2. In the related art, the layout of "multi - hole trash rack + contraction section" is adopted (such as Figure 2 the combination of the first trash rack 2 and the inlet converging section 19 in 栅 ). By increasing the number of grid holes to widen the width of the trash rack (B 洞 = 3 - 4 times B 栅 ), where B 洞 and B Figure 2 respectively represent the width of the trash rack and the width of the tunnel), an enlarged flow - through area is formed. The rear end of the inlet converging section 19 is connected to the inlet 9 (as 洞 shown). Then, when the inlet 9 is located in the high - slope area, the increased amount ΔB of the width of the trash rack is equal to 2 - 3 times B

[0032] As Figure 3 and Figure 4As shown in the figure, an embodiment of the present invention provides a water inlet structure for a pressurized tunnel. There is a diversion channel 7 upstream of the pressurized tunnel 4. The water inlet structure of the pressurized tunnel 4 includes a drop well 8 and a trash rack assembly. The drop well 8 is arranged at the connection between the diversion channel 7 and the pressurized tunnel 4. One end of the pressurized tunnel 4 close to the drop well 8 is provided with a water inlet 9. The drop well 8 has a vertical depth and communicates with the water inlet 9 of the pressurized tunnel 4 from the side. The sum of the vertical depth and the water depth of the diversion channel 7 minus the diameter of the pressurized tunnel 4 is greater than or equal to the minimum submergence depth of the pressurized tunnel 4. The trash rack assembly is arranged along the periphery of the wellhead of the drop well 8 and is used to prevent floating objects from entering the drop well 8. Then the trash rack assembly is arranged along the periphery of the drop well 8 and is used to prevent various floating objects (such as driftwood, branches, leaves, weeds, garbage, and floating ice, etc.) from entering the pressurized tunnel 4, thereby avoiding damage or abrasion to equipment such as valves and water turbines at the outlet of the pressurized tunnel 4.

[0033] Specifically, the drop well 8 is arranged at the connection between the diversion channel 7 and the pressurized tunnel 4. Then the water flow with floating objects flows down from the upstream direction of the diversion channel 7, enters the drop well 8 through the wellhead of the drop well 8, and enters the pressurized tunnel 4 from the side of the drop well 8. The floating objects are intercepted by the interception assembly around the wellhead of the drop well 8. Since the drop well 8 communicates with the water inlet 9 of the pressurized tunnel 4 from the side, the drop well 8 covers the pressurized tunnel 4 from the side of the water inlet 9 of the pressurized tunnel 4. Then the water flow can pass through the drop well 8 not only from the front direction parallel to the water flow but also from other directions (such as from the side direction corresponding to the perpendicular to the water flow). The drop well 8 has a vertical depth. For example, the drop well 8 can be formed by vertical excavation. In other words, the drop well 8 is vertically designed, and the reduced water inlet elevation is equal to the vertical depth. In the related art, when it is necessary to reduce the inlet elevation Δh, the horizontal projection length L of the traditional slope section = Δh / i (i ≤ 1:5). In this technical solution, the drop well 8 scheme can save the slope section and significantly shorten the connection section length. From the perspective of the excavation volume, when Δh increases, the connection section of the drop well 8 scheme does not need to set a slope section, and only needs to achieve water level connection through the drop well 8 at the tunnel entrance. When Δh increases, only a small amount of vertical excavation volume of the drop well 8 itself needs to be increased, which has little impact on the engineering quantity of the overall connection section. It has obvious advantages in controlling the excavation scale and engineering cost compared with the traditional scheme. In addition, the sum of the vertical depth of the drop well 8 and the water depth H of the diversion channel 7 minus the diameter d of the pressurized tunnel 4 is greater than or equal to the minimum submergence depth Smin of the pressurized tunnel 4. As marked in Figure 4 the figure, it is expressed as H + Δh - d ≥ Smin, and theoretically S ≥ 0.55 × V × d 0.5(The minimum value is obtained in the case of an equal sign), d is the inner diameter of the pressure tunnel 4, and V is the flow velocity inside the pressure tunnel 4. In practice, the water depth H of the diversion channel 7 and the flow velocity V inside the pressure tunnel 4 are simulated under different water flow rates. The Δh under different water flow rates is calculated based on H and V under different water flow rates, and the maximum value calculated is selected as the appropriate value of Δh to meet the requirements of the submergence depth under various possible water flow conditions. After excavating the drop well 8 with a vertical depth according to Δh, the minimum submergence depth requirement of the pressure tunnel 4 can be met, preventing the occurrence of a through-type funnel vortex at the water inlet 9 of the pressure tunnel 4 and ensuring that the water flow inside the water inlet 9 is in a pressure flow state.

[0034] When this embodiment is applied in practice, the design of the drop well 8 enables the water flow to flow in from the upstream direction of the diversion channel 7 and enter the pressure tunnel 4 through the drop well 8. The drop well 8 is arranged at the connection between the diversion channel 7 and the pressure tunnel 4, and the drop well 8 has a vertical depth. The sum of the vertical depth and the water depth of the diversion channel 7 minus the diameter of the pressure tunnel 4 is greater than or equal to the minimum submergence depth of the pressure tunnel 4, strictly ensuring that the water flow inside the water inlet 9 is in a pressure flow state, improving the water conveyance capacity of the pressure tunnel 4, ensuring controllable flow rate, and meeting the requirements of water supply, power generation, etc.; the drop well 8 is vertically designed and connected to the diversion channel 7 and the pressure tunnel 4, then the reduced inlet elevation of the drop well 8 is equal to the vertical depth, breaking through the limitation in the related technology that a slope section needs to be set to connect the diversion channel 7 and the pressure tunnel 4, greatly shortening the horizontal projection length and significantly reducing the excavation volume; further, the drop well 8 communicates with the water inlet 9 of the pressure tunnel 4 from the side, then the drop well 8 covers the pressure tunnel 4 from one side of the water inlet 9 of the pressure tunnel 4, and the anti-pollution component is arranged along the periphery of the drop well 8. Then, the water flow with floating objects can not only pass through the anti-pollution component from the front direction parallel to the water flow and then enter the pressure tunnel 4 through the drop well 8, but also be affected by the anti-pollution component from other directions (such as from the side direction corresponding to the perpendicular to the water flow). Then, the floating objects can be intercepted in multiple directions along the periphery of the drop well 8, not only effectively preventing the floating objects from entering the pressure tunnel 4, but also being able to reduce the lateral size of the floating object interception equipment in the related technology and reducing the excavation and support requirements for the high slope area.

[0035] As Figure 4 、 Figure 6 and Figure 7 shown, as an alternative embodiment of the present invention, the drop well 8 includes a drop side wall 81 and a drop bottom plate 82. The drop side wall 81 and the drop bottom plate 82 enclose to form the drop well 8. The drop well 8 is vertically embedded in the diversion channel 7, and the side of the drop well 8 facing the pressure tunnel 4 is communicated with the water inlet 9 of the pressure tunnel 4. The anti-pollution component is arranged on the top of the drop side wall 81.

[0036] It should be noted that the width (inner diameter) of the drop well 8 is generally equal to the tunnel diameter of the pressure tunnel 4, and the length is generally taken as 2 to 3 times the width.

[0037] Specifically, the drop side walls 81 and the drop bottom plate 82 enclose to form the drop well 8. The drop side walls 81 vertically extend from the bottom of the diversion channel 7 to form a fixation. The drop well 8 is connected to the pressure tunnel 4, thus forming a water flow channel from the diversion channel 7 → the drop well 8 → the pressure tunnel 4. The water flowing into the diversion channel 7 first enters the drop well 8 and then enters the pressure tunnel 4. And the trash rack assembly is arranged on the top of the drop side walls 81, so that the floating objects in the water entering the water inlet of the pressure tunnel 4 are intercepted. Moreover, the drop well 8 adopts a vertical design with vertical excavation. The vertical excavation has a relatively small opening, which can reduce the amount of earth and rock excavation, reduce the floor area, break through the limitation in the related technology that a slope section needs to be set to connect the bottom of the channel and the bottom of the tunnel, and shorten the horizontal projection length.

[0038] As Figure 4 、 Figure 6 and Figure 7 shown, as an optional embodiment of the present invention, the drop side walls 81 include a first side wall and second side walls. There are two second side walls which are arranged in parallel. The first side wall is arranged between the two second side walls, and one end of each second side wall is fixedly connected to the first side wall, and the other end is respectively fixedly connected to the outer tunnel wall of the pressure tunnel 4.

[0039] Specifically, the first side wall and the second side walls enclose to form the side wall of the drop well 8. The second side walls are directly fixedly connected to the outer tunnel wall of the pressure tunnel 4 and are located on the outside to realize the covering of the pressure tunnel 4. The first side wall and the second side walls can be arranged at a certain angle, so that the top view of the side wall of the drop well 8 is in the shape of a rhombus, a matrix, a quasi-ellipse, etc. The trash rack assembly can be arranged along the side wall, reducing the lateral interception dimension perpendicular to the water flow direction and reducing the excavation and support requirements for the high slope area.

[0040] As Figure 4 、 Figure 6 、 Figure 7 and Figure 8 shown, as an optional embodiment of the present invention, the first side wall is parallel to the water flow direction, the second side walls are perpendicular to the water flow direction, the top of the drop side walls 81 is flush with the bottom surface of the diversion channel 7, the top surface of the drop bottom plate 82 is tangent to the inner bottom surface of the water inlet 9, and the vertical depth is the vertical distance between the top of the drop side walls 81 and the top surface of the drop bottom plate 82.

[0041] Specifically, the side wall parallel to the water flow direction is the first side wall, the second side wall is perpendicular to the first side wall, and the top view of the drop side wall 81 is rectangular. The drop bottom plate 82 is arranged at the bottom of the drop side wall 81 and is vertically fixed. The top of the drop side wall 81 is flush with the bottom surface of the diversion channel 7. That is, the drop well 8 is vertically excavated downward according to the surface of the diversion channel 7. The drop bottom plate 82 is vertically arranged downward at the bottom of the drop side wall 81 to ensure that the vertical depth is the vertical distance between the top of the drop side wall 81 and the top surface of the drop bottom plate 82.

[0042] As Figure 4 , Figure 6 and Figure 7 shown, as an alternative embodiment of the present invention, the trash rack assembly includes a second trash rack 10 and trash rack piers 103. A plurality of the trash rack piers 103 are vertically arranged at the top of the drop side wall 81 and are spaced around the wellhead of the drop well 8. The second trash rack 10 is slidably arranged between every two adjacent trash rack piers 103.

[0043] Specifically, the second trash rack 10 is established based on the trash rack piers 103. The trash rack piers 103 are evenly arranged along the drop side wall 81. The space for installing the second trash rack 10 is formed between two adjacent drop side walls 81. The second trash rack 10 is slidably installed between two adjacent trash rack piers 103, so that operations such as hoisting can be realized, which is convenient for maintenance and repair.

[0044] As Figure 3 , Figure 4 , Figure 6 and Figure 7 shown, further, the second trash rack 10 includes a front trash rack 101 and a side trash rack 102. The front trash rack 101 is arranged between every two adjacent trash rack piers 103 on the first side wall. The side trash rack 102 is arranged between every two adjacent trash rack piers 103 on the second side wall.

[0045] Specifically, the front trash rack 101 is arranged perpendicular to the water flow direction to intercept the main floating objects in the water flow; the side trash rack 102 is arranged along the direction parallel to the water flow direction to assist in intercepting floating objects. The two form a three-dimensional trash rack system. This design can not only effectively block various floating objects such as driftwood and branches and prevent them from entering the pressure tunnel 4, but also, compared with the traditional method of simply increasing the number of grid holes to widen the width of the trash rack, through reasonable spatial layout, while meeting the requirements of the grid flow velocity specification (0.8 - 1 m / s), it reduces the transverse dimension of the intake trash rack structure and reduces the excavation and support requirements for the high slope area.

[0046] As Figure 9 , Figure 10 andFigure 11 As shown in the figure, as an alternative embodiment of the present invention, both the forward trash rack 101 and the side trash rack 102 include vertical beams 15, cross beams 16 and guide members 17. A plurality of vertical beams 15 and cross beams 16 are respectively provided and intersect at horizontal and vertical intervals. The guide members 17 are respectively arranged on the vertical beams 15 on both sides. Chutes are provided on two adjacent trash retaining piers 103, and the guide members 17 are slidably engaged with the chutes.

[0047] It can be understood that chutes are provided on both adjacent drop - water side walls 81. The chutes are slidably connected to the second trash rack 10. The second trash rack 10 can be placed into the chutes. The reliable trash retaining pier 103 ensures the stability of the second trash rack 10. The second trash rack 10 does not need to be driven into the ground and is held in place by the chutes on both sides. The second trash rack 10 has a certain self - weight and can be installed by hoisting. After installation, wires or the like can be applied for fastening. The second trash rack 10 is divided into multiple trash rack segments and can be arranged around the drop - well 8 to play a role in comprehensive trash interception and avoid trash interception from a single direction.

[0048] Specifically, for the structural composition of the forward trash rack 101 and the side trash rack 102, they are exactly the same, only differing in size. Both the forward trash rack 101 and the side trash rack 102 are fixedly connected by vertical beams 15 and cross beams 16 intersecting at horizontal and vertical intervals to form a mesh structure. Guide members 17 are provided on the vertical beams 15 on both sides. The guide members 17 can be sliders or pulleys, which are slidably engaged with the chutes on the trash retaining piers 103. That is, chutes are provided inside two adjacent trash retaining piers 103. The forward trash rack 101 or the side trash rack 102 is installed between two adjacent trash retaining piers 103 through the chutes, and the chutes are pre - embedded in the trash retaining piers 103. The chutes are usually made of concrete, steel or composite materials. The material of the vertical beams 15 is mostly steel or stainless steel. The grid bar spacing is 30 - 100 mm. The cross beams 16 are used to enhance the overall stiffness. Lifting lugs are provided at the tops of the forward trash rack 101 and the side trash rack 102 to meet the requirements of lifting. Auxiliary functional components can also be equipped, including rake teeth, tooth grooves or flushing systems for auxiliary trash cleaning, and anti - corrosion coatings such as hot - dip galvanized or stainless - steel materials. Each component works together to achieve the functions of efficient trash interception, convenient maintenance and stable structure.

[0049] Such as Figure 5 、 Figure 6As shown in the figure, as an alternative embodiment of the present invention, the water diversion channel 7 includes a channel slope 71 and a channel bottom plate 72 connected to each other. There are two channel slopes 71, which are respectively located on both sides of the channel bottom plate 72. The drop well 8 is arranged at the connection between the channel bottom plate 72 and the pressure tunnel 4. The top of the drop side wall 81 is flush with the surface of the channel bottom plate 72, and the drop side wall 81 is perpendicular to the channel bottom plate 72.

[0050] Specifically, the channel slope 71 is set to have an inverted trapezoidal cross-section. The drop well 8 is arranged at the connection between the channel bottom plate 72 and the pressure tunnel 4. The top of the drop side wall 81 is flush with the surface of the channel bottom plate 72, that is, at the connection between the end of the channel bottom plate 72 and the pressure tunnel 4. The top of the drop side wall 81 is flush with the surface of the channel bottom plate 72. The water flowing along the water diversion channel 7 will concentrate and smoothly enter the drop well 8 before entering the pressure tunnel 4. The vertical design of the drop side wall 81 relative to the channel bottom plate 72 greatly shortens the horizontal projection length. In addition, the design of the excavation slope 5 around the water diversion channel 7 enables the water diversion channel 7 and the pressure tunnel 4 to smoothly transition to the surrounding horizon, improving the stability of drainage.

[0051] As Figure 3 shown, as an alternative embodiment of the present invention, a berm 14 is provided around the drop well 8, and the excavation slope 5 is separated by the berm 14.

[0052] Specifically, several circles or several sections of berms 14 are provided along the periphery of the drop well 8. There is a certain distance between the berm 14 and the drop well 8. The berm 14 closer to the drop well 8 has a larger size. The berm 14 is obtained by leveling and ramming (or adding concrete) to the vertical beam 15, improving the stability of the vertical beam 15. Concrete can be laid at the position of the berm 14, and inclined supports are also provided on both sides of the berm 14 to improve the stability of the berm 14. The berm 14 can facilitate the passage of personnel and equipment, ensuring that the daily maintenance and repair work of the entire water inlet structure can be carried out efficiently.

[0053] As Figure 4 、 Figure 6 and Figure 7 shown, as an alternative embodiment of the present invention, it further includes a maintenance platform 12 arranged on the trash rack pier 103. A lifting support assembly is provided on the maintenance platform 12. The lifting support assembly is used to install a lifting device 13. The lifting device 13 is used to lift the second trash rack 10. When the second trash rack 10 is lifted, its bottom is clamped in the chute by the I-beam 18 arranged on the trash rack pier 103.

[0054] Specifically, as described above, lifting ears are provided on the tops of the forward trash rack 101 and the lateral trash rack 102 to meet the lifting requirements. The maintenance platform 12 can provide an operating space for salvaging floating objects in front of the second trash rack 10 and its maintenance equipment. The maintenance platform 12 can be configured as a support plate structure; a lifting support assembly can be provided on the maintenance platform 12, and the lifting support assembly is used to bear the weight of the lifting support. The lifting support assembly can be a beam structure fixedly connected horizontally and vertically. The lifting device 13 can be a wire rope pulley lifting structure with a hook. The lifting device 13 can be used to lift the second trash rack 10 for maintenance; when When hoisted to a certain height, the lower part of the second trash rack 10 is still slidably embedded in the chute, and the upper part is exposed to the trash pier 103. The I-shaped steel 18 is inserted in the longitudinal grid at the intersection of the upper and lower parts (that is, the surface of the trash pier 103). The I-shaped steel 18 can be movable under the action of external force. The two ends of the I-shaped steel 18 are located on the surface of the trash pier 103. At this time, the second trash rack 10 is equivalent to being erected on the I-shaped steel 18. Since the I-shaped steel 18 has a certain dead weight, the I-shaped steel 18 can clamp the second trash rack 10 in the chute in this state, thereby ensuring its stability after being hoisted and facilitating maintenance and removal of pollutants thereon.

[0055] like Figure 6 and Figure 7 As shown, as an optional embodiment of the present invention, the lifting support assembly includes a frame column 111 and a frame beam 112, the frame column 111 is provided with a plurality and fixed to the surface of the maintenance platform 12, the frame beam 112 is used to connect every two adjacent frame columns 111, and the lifting equipment 13 is arranged on the frame beam 112.

[0056] It should be noted that an escape opening (not shown in the figure) is provided on the maintenance platform 12, which is mainly used to avoid the lifting rope of the lifting device 13 and lift the forward trash rack 101 and the lateral trash rack 102 to a certain position (not reaching a position flush with the maintenance platform 12).

[0057] Specifically, a lifting support assembly is arranged on the frame beam 112, and the lifting support assembly mainly includes a frame column 111 and a maintenance platform 12. The frame column 111 can be preferably arranged at a position close to the trash pier 103 in the vertical direction to improve the firmness of the lifting support assembly; the frame beam 112 is erected on multiple frame columns 111, and the frame beam 112 is located at the top of the frame column 111 and connects two adjacent frame columns 111 to form a mesh structure of the lifting beam, and a lifting device 13 is installed on the frame beam 112. The lifting device 13 is used to lift the forward trash rack 101 and the lateral trash rack 102 when they need to be repaired, or to be used for cleaning blockages on the forward trash rack 101 and the lateral trash rack 102, etc., to improve the convenience of maintenance.

[0058] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather will conform to the broadest scope consistent with the principles and novel features invented herein.

[0059] Although the present invention is disclosed as above, the scope of protection of the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will all fall within the scope of protection of the present invention.

Claims

1. An intake structure for a pressurized tunnel, characterized in that, An intake channel (7) is provided upstream of the pressure tunnel (4). The water inlet structure of the pressure tunnel (4) includes a drop well (8) and a trash rack assembly. The drop well (8) is arranged at the connection between the intake channel (7) and the pressure tunnel (4). One end of the pressure tunnel (4) close to the drop well (8) is provided with a water inlet (9). The drop well (8) has a vertical depth and communicates with the water inlet (9) of the pressure tunnel (4) from the side. The difference between the sum of the vertical depth and the water depth of the intake channel (7) and the diameter of the pressure tunnel (4) is greater than or equal to the minimum submergence depth of the pressure tunnel (4). The trash rack assembly is arranged along the periphery of the wellhead of the drop well (8) and is used to prevent floating objects from entering the drop well (8).

2. The water inlet structure of the pressure tunnel according to claim 1, characterized in that The drop well (8) includes a drop side wall (81) and a drop bottom plate (82). The drop side wall (81) and the drop bottom plate (82) enclose to form the drop well (8). The drop well (8) is vertically embedded in the intake channel (7), and the side of the drop well (8) facing the pressure tunnel (4) communicates with the water inlet (9) of the pressure tunnel (4). The trash rack assembly is arranged at the top of the drop side wall (81).

3. The water inlet structure of the pressure tunnel according to claim 2, characterized in that, The drop side wall (81) includes a first side wall and a second side wall. There are two second side walls which are arranged in parallel. The first side wall is arranged between the two second side walls, and one end of each second side wall is fixedly connected to the first side wall, and the other end is respectively fixedly connected to the outer wall of the pressure tunnel (4).

4. The water inlet structure of the pressure tunnel according to claim 3, characterized in that The first side wall is parallel to the water flow direction, the second side wall is perpendicular to the water flow direction. The top of the drop side wall (81) is flush with the bottom surface of the intake channel (7). The top surface of the drop bottom plate (82) is tangent to the inner bottom surface of the water inlet (9). The vertical depth is the vertical distance between the top of the drop side wall (81) and the top surface of the drop bottom plate (82).

5. The water inlet structure of the pressure tunnel according to claim 3 or 4, characterized in that, The trash rack assembly includes a second trash rack (10) and trash rack piers (103). A plurality of the trash rack piers (103) are vertically arranged at the top of the drop side wall (81) and are spaced around the wellhead of the drop well (8). The second trash rack (10) is slidably arranged between every two adjacent trash rack piers (103).

6. The water inlet structure of the pressurized tunnel according to claim 5, characterized in that, The second trash rack (10) includes a front trash rack (101) and a side trash rack (102). The front trash rack (101) is arranged between every two adjacent trash rack piers (103) on the first side wall. The side trash rack (102) is arranged between every two adjacent trash rack piers (103) on the second side wall.

7. The water inlet structure of the pressurized tunnel according to claim 6, characterized in that, The forward trash rack (101) and the lateral trash rack (102) both include vertical beams (15), cross beams (16) and guide members (17). A plurality of vertical beams (15) and cross beams (16) are respectively provided and intersect at horizontal and vertical intervals. The guide members (17) are respectively arranged on the vertical beams (15) on both sides. Chutes are provided on two adjacent trash rack piers (103), and the guide members (17) are slidably engaged with the chutes.

8. The water inlet structure of the pressurized tunnel according to claim 5, characterized in that The water diversion channel (7) includes a channel slope (71) and a channel bottom plate (72) connected to each other. Two channel slopes (71) are provided and are respectively located on both sides of the channel bottom plate (72). The drop well (8) is arranged at the connection between the channel bottom plate (72) and the pressure tunnel (4). The top of the drop well side wall (81) is flush with the surface of the channel bottom plate (72), and the drop well side wall (81) is perpendicular to the channel bottom plate (72).

9. The water inlet structure of the pressure tunnel according to claim 8, characterized in that The water diversion channel (7) is connected to the horizon (6) through an excavation slope (5), and the excavation slope (5) is separated by a bench (14).

10. The water inlet structure of the pressurized tunnel according to claim 7, characterized in that, It further includes a maintenance platform (12) arranged on the trash rack pier (103). A lifting support assembly is provided on the maintenance platform (12), and the lifting support assembly is used to install a lifting device (13). The lifting device (13) is used to lift the second trash rack (10). After the second trash rack (10) is lifted, its bottom is clamped in the chute by the I-beam (18) arranged on the trash rack pier (103).

Images