Multi-stage drop shaft

Abstract

The utility model provides a kind of multistage drop vertical shaft, it is related to drainage flood control technical field.The multistage drop vertical shaft includes: shaft and the multistage relay drop water transfer tank being set in shaft from top to bottom;Shaft top is equipped with water inlet, and multistage relay drop water transfer tank is located below water inlet;Any stage relay drop water transfer tank is equipped with emptying hole and overflow weir.In small flow condition, it can be drained downwards by emptying hole stage by stage, and in larger flow condition, water in relay drop water transfer tank can be overflowed stage by stage through overflow weir, and relay drop water transfer tank located below can quickly form water cushion layer.Water is drained from top to bottom through multistage relay drop water transfer tank to realize multistage energy dissipation, and upstream high flow water body can be safely, economically and orderly discharged to downstream, so as to ensure the safety and smoothness of drainage system in design catchment area.

Description

Technical Field

[0001] This utility model relates to the field of drainage and flood control technology, and in particular to a multi-stage drop vertical shaft. Background Technology

[0002] Inspection wells, as an important component of urban infrastructure, are widely used in drainage systems of municipal and water conservancy projects. Among them, drop manholes, a special type of inspection well, are mainly installed in areas with abrupt changes in terrain slope, deep main pipe burials, and shallow branch pipes to meet the functional requirements of the drainage system. It is worth noting that when facing high flow rates and significant drops, the significant hydraulic impact characteristics place even stricter technical requirements on the structural design of drop manholes. Utility Model Content

[0003] The purpose of this utility model is to provide a multi-stage drop shaft to meet the technical requirements of high flow rate and high drop conditions.

[0004] In the first aspect, the multi-stage drop shaft provided by this utility model includes: a shaft and a multi-stage relay drop transfer pool arranged from top to bottom in the shaft; The top of the well is provided with a water inlet, and the multi-stage relay drop transfer pool is located below the water inlet; All intermediate drop-transfer pools described at any level are equipped with vent holes and overflow weirs.

[0005] In conjunction with the first aspect, this utility model provides a first possible implementation of the first aspect, wherein the multi-stage relay drop transfer pools are arranged sequentially from top to bottom along the inner wall of the well in a counterclockwise direction.

[0006] In conjunction with the first aspect, this utility model provides a second possible implementation of the first aspect, wherein the height difference between any two adjacent relay drop transfer pools is less than or equal to 4 meters.

[0007] In conjunction with the first aspect, this utility model provides a third possible implementation of the first aspect, wherein the bottom of the relay drop transfer pool is provided with a slope of 2% that slopes downward in the direction close to the vent hole.

[0008] In conjunction with the first aspect, this utility model provides a fourth possible implementation of the first aspect, wherein the height of the water-retaining side wall of the relay drop transfer pool is 1400mm, and the height of the overflow weir wall is 600mm.

[0009] In conjunction with the first aspect, this utility model provides a fifth possible implementation of the first aspect, wherein a ladder is provided between any two adjacent relay drop transfer pools.

[0010] In conjunction with the first aspect, this utility model provides a sixth possible implementation of the first aspect, wherein the top of the overflow weir is provided with an outwardly extending guide platform, and the outer edge of the guide platform is provided with an arc portion.

[0011] In conjunction with the first aspect, this utility model provides a seventh possible implementation of the first aspect, wherein the top of the well is covered with a grid cover plate.

[0012] In conjunction with the first aspect, this utility model provides an eighth possible implementation of the first aspect, wherein the well is provided with a ventilation pipe extending upward from the bottom to the outside.

[0013] In conjunction with the first aspect, this utility model provides a ninth possible implementation of the first aspect, wherein the top of the ventilation pipe is provided with a downward bend.

[0014] This utility model embodiment brings the following beneficial effects: It employs a shaft and a multi-stage relay drop transfer pool arranged from top to bottom within the shaft. An inlet is located at the top of the shaft, and the multi-stage relay drop transfer pool is situated below the inlet. Each stage of the relay drop transfer pool is equipped with a vent and an overflow weir. Under low flow conditions, water can be drained downwards stage by stage through the vent. Under higher flow conditions, water in the relay drop transfer pool can overflow stage by stage through the overflow weir. The lower relay drop transfer pool can quickly form a water cushion layer. The top-down drainage, through the multi-stage relay drop transfer pool, achieves multi-stage energy dissipation, safely, economically, and orderly discharging large-flow water bodies from upstream to downstream, thereby ensuring the safe and unobstructed drainage system within the designed catchment area.

[0015] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 A schematic diagram of a multi-stage drop shaft provided for an embodiment of this utility model; Figure 2 for Figure 1 A sectional view at position A in the middle; Figure 3 for Figure 1 A sectional view at position B in the middle; Figure 4for Figure 1 A cross-sectional view at position C in the middle; Figure 5 for Figure 1 A cross-sectional view at position D in the middle; Figure 6 for Figure 1 A cross-sectional view at position E in the middle; Figure 7 for Figure 1 A sectional view at position F in the middle; Figure 8 A cross-sectional schematic diagram of the overflow weir of the multi-stage drop shaft provided in this embodiment of the utility model; Figure 9 A longitudinal sectional view of the overflow weir of a multi-stage drop shaft provided in an embodiment of this utility model.

[0018] Icons: 100-Hydraulic shaft; 101-Inlet; 102-Collection well; 200-Intermediate drop transfer pool; 201-Vent hole; 202-Overflow weir; 221-Guide platform; 222-Circular arc section; 300-Ladder; 400-Grate cover; 500-Ventilation pipe; 501-Elbow. Detailed Implementation

[0019] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first," "second," and "third" are only used to describe differences in name and should not be construed as indicating or implying relative importance. Physical quantities in formulas, unless otherwise specified, should be understood as basic quantities of the International System of Units (SI) base units, or derived quantities derived from basic quantities through mathematical operations such as multiplication, division, differentiation, or integration.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] like Figure 1 As shown, the multi-stage drop shaft provided in this embodiment of the present invention includes: a shaft 100 and a multi-stage relay drop transfer pool 200 arranged from top to bottom within the shaft 100; an inlet 101 is provided at the top of the shaft 100, and the multi-stage relay drop transfer pool 200 is located below the inlet 101; each stage relay drop transfer pool 200 is provided with a vent hole 201 and an overflow weir 202.

[0023] Under low flow conditions, water can be drained step-by-step downwards through the vent 201. Under higher flow conditions, water in the intermediate drop-transfer pool 200 can overflow step-by-step through the overflow weir 202, and the intermediate drop-transfer pool 200 located at the bottom can quickly form a water cushion layer. The drainage from top to bottom through the multi-stage intermediate drop-transfer pool 200 achieves multi-stage energy dissipation, which can safely, economically, and orderly discharge large-flow water bodies from high upstream locations to downstream, thereby ensuring the safe and smooth operation of the drainage system within the designed catchment area.

[0024] The bottom of the shaft 100 is provided with a water collection well 102. Water discharged from the lowest intermediate drop transfer pool 200 is collected in the water collection well 102 and finally discharged through the drain outlet connected to the water collection well 102.

[0025] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown in this embodiment of the utility model, the multi-stage relay drop transfer pool 200 is arranged sequentially from top to bottom along the inner wall of the shaft 100 in a counterclockwise direction.

[0026] Specifically, the cross-section of the inner wall of the shaft 100 is rectangular. The intermediate cascading transfer pool 200 can be formed by the inner walls of the shaft 100 on both sides or three sides, as well as the added water-retaining wall and overflow weir 202. The multi-stage intermediate cascading transfer pools 200 are arranged sequentially from top to bottom along the inner wall of the shaft 100 in a counterclockwise direction. The overflow weirs 202 of the multi-stage intermediate cascading transfer pools 200 are arranged sequentially from top to bottom along the inner wall of the shaft 100 in a counterclockwise direction. The overflow weir 202 in the uppermost intermediate cascading transfer pool 200 is located next to the inlet 101. The water flow turns 90 degrees from the inlet 101 to the first-stage overflow weir 202, and turns another 90 degrees for each subsequent overflow, thereby increasing the water travel distance and enhancing the energy dissipation effect of water collision and tumbling. During the process of a large flow of water being discharged into the wellbore within 100 mm and falling into the water cushion layer, most of the excess energy is consumed through collision, friction, tumbling, rotation, and splashing of the water, along with the incorporation of a large amount of air. The kinetic energy of the water flow is continuously transferred to turbulent pulsations and large-scale vortex regions through turbulent shearing and diffusion. This energy transfer and redistribution process is accompanied by viscous dissipation caused by shearing. The energy dissipation method mainly consumes energy through turbulence generation and turbulent dissipation, which is safer and more economical.

[0027] The net plan dimensions of the shaft 100 are greater than 7m×7m, and the net plan dimensions of the intermediate drop transfer pool 200 are 5m×5m.

[0028] The height difference between any two adjacent intermediate drop transfer pools is less than or equal to 4 meters, and the effective splash width is within 2 meters.

[0029] The multi-stage drop shaft described in this embodiment is particularly suitable for end-use applications, such as adding water storage and reuse based on sponge city or other needs. Its size can be increased as needed according to the water volume calculation results and combined with the opening and control of the drainage gate. It can also have the function of water storage.

[0030] like Figure 1 and Figure 8 As shown, the bottom of the relay drop transfer pool 200 is provided with a slope of 2% that slopes downwards in the direction close to the vent hole 201.

[0031] The vent hole 201 can be configured with a 400mm×300mm opening and is located at the bottom of the side where the overflow weir 202 is located in the relay drop transfer pool 200. It is used for drainage when the inflow rate is small and to drain accumulated water.

[0032] like Figure 1 As shown, the water-retaining side wall of the relay drop transfer pool 200 is 1400mm high, and the wall height of the overflow weir 202 is 600mm high, which can form a water cushion layer of effective depth. This is because, through hydraulic calculation, the water head height above the weir can be guaranteed to be 0.8m when the weir width is 5m.

[0033] A ladder 300 is provided between any two adjacent intermediate drop transfer pools 200. The upper part of the ladder 300 is ≥1.2m higher than the bottom of the pool. A personnel passage is provided on the higher part so that people can easily climb in and out of the ladder.

[0034] like Figure 1 and Figure 9 As shown, the top of the overflow weir 202 is provided with a guide platform 221 extending outward, and the outer edge of the guide platform 221 is provided with an arc part 222. Water overflowing from the guide platform 221 can fall into the central area of ​​the lower intermediate relay drop transfer pool 200.

[0035] like Figure 1 As shown, the top of the shaft 100 is covered with a grating cover plate 400, which is made of G303 / 30 / 100 steel grating cover plate to maximize the ventilation effect and ensure that the water vapor is fully exchanged with the outside.

[0036] Furthermore, the shaft 100 is equipped with a ventilation pipe 500 extending upwards from the bottom to the outside. The bottom of the ventilation pipe 500 is 1.6m away from the bottom of the shaft 100. This is used to force fresh air into the shaft when maintenance or cleaning is required. When maintenance is needed, a ventilation fan is used to force ventilation to remove toxic gases, ensuring personnel safety.

[0037] In addition, the top of the ventilation duct 500 is provided with a downward elbow 501, which can prevent rainwater or other debris from entering the ventilation duct 500.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A multi-stage drop shaft, characterized by, include: Shaft (100) and multi-stage relay drop transfer pool (200) arranged from top to bottom in the shaft (100); The top of the well (100) is provided with a water inlet (101), and the multi-stage relay drop transfer pool (200) is located below the water inlet (101); Each of the intermediate drop transfer pools (200) described at any level is provided with a vent (201) and an overflow weir (202). The cross-section of the inner wall of the shaft (100) is rectangular. Each intermediate drop transfer pool (200) can be formed by the inner walls of the shaft (100) on both sides or three sides, as well as the water-retaining wall and the overflow weir (202). The multi-stage relay drop transfer pools (200) are arranged sequentially from top to bottom along the inner wall of the shaft (100) in a counterclockwise direction, and the overflow weirs (202) of the multi-stage relay drop transfer pools (200) are arranged sequentially from top to bottom along the inner wall of the shaft (100) in a counterclockwise direction.

2. The multi-stage drop shaft of claim 1, wherein, The height difference between any two adjacent intermediate drop transfer pools (200) is less than or equal to 4 meters.

3. The multi-stage drop shaft of claim 1, wherein, The bottom of the relay drop transfer pool (200) is provided with a slope of 2% that slopes downward in the direction close to the vent hole (201).

4. The multi-stage drop shaft of claim 1, wherein, The height of the water-retaining side wall of the relay drop transfer pool (200) is 1400mm, and the height of the wall of the overflow weir (202) is 600mm.

5. The multi-stage drop shaft of claim 1, wherein, A ladder (300) is provided between any two adjacent intermediate drop transfer pools (200).

6. The multi-stage drop shaft of claim 1, wherein, The overflow weir (202) is provided with a guide platform (221) extending outward at the top, and the outer edge of the guide platform (221) is provided with an arc part (222).

7. The multi-stage drop shaft of claim 1, wherein, The top of the shaft (100) is covered with a grid cover plate (400).

8. The multi-stage drop shaft of claim 1, wherein, The shaft (100) is provided with a ventilation pipe (500) extending from the bottom upwards to the outside.

9. The multi-stage drop shaft according to claim 8, characterized in that, The ventilation duct (500) has a downward bend (501) at the top.

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