Integrated prefabricated pump station and design method thereof

Abstract

The invention discloses an integrated prefabricated pump station and a design method thereof.The integrated prefabricated pump station comprises a high-level storage pond, the design water level of the storage pond is higher than the low point of a concave bridge area, and the integrated prefabricated pump station is provided with a water inlet lower than the low point of the concave bridge area and used for enabling rainwater to flow into a water collecting pond through gravity; the main pump is used for pumping the rainwater to a downstream river channel; the standby pump is used for pumping the excess flow into the regulation and storage tank under the condition that the inflow flow of the water collecting tank exceeds the designed flow of the water collecting tank, the regulation and storage tank is arranged in the upper space of the pump station, incoming water is lifted to the upper space of the pump station through the lifting pump, and therefore the upper idle space of the integrated prefabricated pump station is fully utilized, and the integrated prefabricated pump station is manufactured. And land and investment of regulation and storage facilities are reduced to the maximum extent.

Description

Technical Field

[0001] The invention relates to the field of municipal drainage, and in particular to an integrated prefabricated pump station and a design method thereof. Background Art

[0002] According to Chapter 4.4.8 of the Technical Specifications for Urban Rainwater Storage and Regulation Engineering (GB51174-2017) and Chapter 4.5.5 of the Design Specifications for Rainwater Storage and Discharge in Sag Bridge Areas (DB11 / T1068-2022), "the water inlet height of the regulating and storage tank should be the designed maximum operating water level of the rainwater pumping station, and it is advisable to use overflow to enter the regulating and storage tank." Since the overflow method is used to enter the regulating and storage tank, the highest water level of the regulating and storage facility is determined according to the water inflow situation. Generally, it is located 10 meters below the ground, resulting in a waste of space above the water level. Specifically, when the rainwater flow entering the pump room is greater than the design flow of the pump room, the rainwater in front of the pump reaches the purpose of overflowing into the rainwater regulating and storage tank through the water level increase. However, in order to ensure the passage of the road, the overflow water level cannot be set too high, which will cause water accumulation on the road. Therefore, in order to make the water storage volume of the rainwater regulating and storage tank meet the peak storage volume of the rainwater flow, the area of ​​the rainwater regulating and storage tank will be made very large. The problems that follow are that the rainwater storage pond occupies a large area, requires a large amount of earth excavation during construction, and wastes a lot of upper space.

[0003] Therefore, there is an urgent need to provide an improved integrated prefabricated pump station that can fully utilize the idle space above the prefabricated pump station and minimize the land use and investment of regulation and storage facilities. Summary of the invention

[0004] The present invention aims to provide an integrated prefabricated pump station and a design method thereof, which can solve the above-mentioned technical problems.

[0005] According to one aspect of the present invention, there is provided an integrated prefabricated pump station, comprising a high-level regulating reservoir, wherein the design water level of the regulating reservoir is higher than the low point of the sunken bridge area, and the integrated prefabricated pump station is provided with: a water inlet, which is lower than the low point of the sunken bridge area, for allowing rainwater to flow into the collection pool by gravity; a main pump, for pumping the rainwater out to a downstream river channel; and a standby pump, for pumping the excess flow into the regulating reservoir when the inflow flow into the collection pool exceeds the design flow of the main pump.

[0006] Preferably, the design water level of the regulating reservoir is higher than the high point of the sunken bridge area.

[0007] Preferably, the regulating reservoir also includes an adjustable discharge valve for discharging the inflow of the regulating reservoir into the water collection tank after the peak of the rainwater inflow, and pumping it out to the downstream river channel through the main pump.

[0008] Preferably, the regulating reservoir also includes a backup valve for replacing the adjustable drain valve in case of failure.

[0009] According to another aspect of the present invention, a design method for an integrated prefabricated pump station is provided, which is characterized by comprising: determining the effective volume of a water collection pool and the scale of a main pump according to the design flow peak value of rainfall runoff; determining the effective volume of a regulating reservoir according to the verified design flow of rainfall runoff; wherein the design water level of the regulating reservoir is higher than the road surface at the lowest point of the sunken bridge area, and the integrated prefabricated pump station is provided with: a water inlet, which is lower than the lowest point of the sunken bridge area, for allowing rainwater to flow into the water collection pool by gravity; a main pump, for pumping the rainwater out to a downstream river; and a standby pump, for pumping the excess flow into the regulating reservoir when the inflow flow into the water collection pool exceeds the design flow of the water collection pool.

[0010] Preferably, the design water level of the regulating reservoir is higher than the high point of the sunken bridge area.

[0011] Preferably, the regulating reservoir also includes an adjustable drain valve for discharging the inflow of the regulating reservoir into the water collection tank after the peak of the rainwater inflow, and pumping it out to the downstream river channel through the main pump.

[0012] Preferably, the design flow rate of the main pump is determined according to the following formula: Q d =qΨF, where Q d is the design flow of the main pump, q is the design intensity of the rainwater, Ψ is the comprehensive runoff coefficient, and F is the catchment area of ​​the sunken bridge area.

[0013] Preferably, the effective water depth of the storage tank is determined according to the following formula: Among them, H is the effective water depth of the storage tank, Q i is the estimated maximum inflow flow to the water collection tank, Q d is the design flow rate of the main pump, t0 is the design storage time of the regulating reservoir, t is the time from the beginning of water intake to the water level rising to the highest design water level in the regulating reservoir, and A is the cross-sectional area of ​​the cylinder of the integrated prefabricated pump station.

[0014] The present invention discloses an integrated prefabricated pump station and a design method thereof, comprising a high-position regulating and storage tank, wherein the design water level of the regulating and storage tank is higher than the low point of a sunken bridge area, and the integrated prefabricated pump station is provided with: a water inlet, which is lower than the low point of the sunken bridge area and is used to allow rainwater to flow into the water collection tank by gravity; a main pump, which is used to pump the rainwater out to a downstream river channel; and a standby pump, which is used to pump the excess flow into the regulating and storage tank when the inflow flow of the water collection tank exceeds the design flow of the water collection tank. By arranging the regulating and storage tank in the upper space of the pump station and using a lifting pump to lift the incoming water to the upper space of the pump station, the upper idle space of the integrated prefabricated pump station is fully utilized, thereby minimizing the land use and investment of regulating and storage facilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0016] Figure 1 It is a schematic diagram of the layout of a rainwater storage tank and an integrated prefabricated pump station in the prior art;

[0017] Figure 2 A schematic diagram of the layout of an integrated prefabricated pump station according to an embodiment of the present invention;

[0018] Figure 3 A schematic diagram of the effective water depth of a rainwater storage tank in the prior art;

[0019] Figure 4 It is a technical flow chart of an integrated prefabricated pump station according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] Reference will now be made in detail to various embodiments of the present invention, examples of which are shown in the accompanying drawings and described below. For ease of interpretation and precise definition in the appended claims, the terms "upper", "lower", "inner" and "outer" are used to describe features of the exemplary embodiments shown in the drawings with reference to their positions.

[0022] Figure 2 A schematic diagram of the layout of an integrated prefabricated pump station according to an embodiment of the present invention is shown. As shown in the figure, the embodiment of the present invention provides an integrated prefabricated pump station, including a high-level regulating reservoir, wherein the design water level of the regulating reservoir is higher than the low point of the sunken bridge area, and the integrated prefabricated pump station is provided with: a water inlet, which is lower than the low point of the sunken bridge area, for allowing rainwater to flow into the collection pool by gravity; a main pump, for pumping the rainwater out to a downstream river channel; and a standby pump, for pumping the excess flow into the regulating reservoir when the inflow flow of the collection pool exceeds the design flow of the main pump.

[0023] In the relevant technology, according to the current national specifications and standards, the rainwater discharge capacity of the sunken bridge area should reach a 50-year return period. In order to avoid the impact of the peak flow of rainfall runoff on the drainage system, the storage method is often used to improve the design standard of the system. Figure 1As shown, the conventional rainwater storage method is overflow storage, that is, when the rainwater flow entering the pump room is greater than the designed flow of the pump room, the rainwater in front of the pump is raised to overflow into the rainwater storage tank. However, in order to ensure the passage of the road, the overflow water level cannot be set too high, which will cause water accumulation on the road. Therefore, in order to make the water storage volume of the rainwater storage tank meet the peak storage volume of the rainwater flow, the area of ​​the rainwater storage tank will be made very large. The problems that follow are that the rainwater storage tank occupies a large area, the construction excavation is large, and the upper space is wasted.

[0024] In the embodiment of the present invention, considering that the sump of the traditional integrated prefabricated pump station is at the bottom and there is a certain amount of idle space at the top, the rainwater storage tank is set in the idle space at the top of the integrated prefabricated pump station. When the rainwater flow entering the pump room is greater than the design flow of the pump room (that is, the design flow of the main pump in the sump), the standby pump (that is, the regulating water pump) can be dispatched according to the change of the water level in front of the pump, and the excess flow is lifted and discharged into the rainwater storage tank through the standby pump in the sump. When the water level in front of the pump falls back to the normal range, the standby pump is turned off. In this way, the design of the rainwater storage tank can make full use of the vertical space occupied, and the area of ​​the rainwater storage tank can be made very small. This design scheme can make the rainwater storage tank occupy as little space as possible, reduce the earthwork excavation during construction, and make full use of the vertical space.

[0025] According to an embodiment of the present invention, the regulating reservoir further includes an adjustable water discharge valve for discharging the inflow of the regulating reservoir into the water collection tank after the peak of the rainwater inflow, and pumping it out to the downstream river channel through the main pump.

[0026] According to an embodiment of the present invention, the regulating reservoir further comprises a backup valve for replacing the adjustable drain valve in case of failure.

[0027] In the related art, the rainwater stored in the regulating reservoir is directly pumped into the downstream river channel by an additional water pump. However, the water pump installed in the regulating reservoir is usually small in power and drains water slowly. In the embodiment of the present invention, an adjustable drain valve is provided at the middle partition wall between the water collection pool and the regulating reservoir. After the peak of the rainwater flow, the rainwater in the regulating reservoir flows into the water collection pool and is pumped out to the downstream river channel by a more powerful main pump. In addition, in order to prevent the adjustable drain valve from failing, a backup valve can also be provided as a backup in case the adjustable drain valve fails.

[0028] According to an embodiment of the present invention, the design water level of the regulating reservoir is higher than the high point of the sunken bridge area.

[0029] In the related art, if the regulating reservoir is set higher than the lowest point of the sunken bridge area, it is easy to cause water accumulation in the sunken bridge area. In the embodiment of the present invention, since a backup pump (i.e., a regulating water pump) is used to control the rainwater in the water collection pool to enter the regulating reservoir, its height is not affected by the sunken bridge area. When the design standard is high, it can be higher than the highest point of the sunken bridge area, that is, above the ground, to make full use of the vertical space and reduce the floor area of ​​the regulating reservoir accordingly.

[0030] Specifically, Figure 3 A schematic diagram of the effective water depth of a rainwater storage tank in the prior art is shown. As shown in the figure, the existing rainwater pump station storage tank design technology is based on Chapter 4.5.5 of the "Design Specification for Rainwater Storage and Discharge in Sunken Bridge Areas" (DB11 / T1068-2022), "The water inlet height of the storage tank should be the designed maximum operating water level of the rainwater pump station, and it is advisable to use overflow to enter the storage tank." Generally, the lowest point of the road surface in the sunken bridge area is about 7 meters from the ground, and the bottom height of the rainwater storage tank is about 4 meters lower than the road surface. Considering the safety height of 1 meter, that is, the water level of the storage tank is 1 meter away from the lowest point of the road surface in the sunken bridge area, the effective water depth of the storage tank is H0=3 meters. In the embodiment of the present invention, since the water inlet of the storage tank is lifted by a pump, its maximum water level is not limited by the elevation of the lowest point in the sunken bridge area, and can be set above the ground, which is more flexible and can be adjusted mainly according to land use restrictions. For example, we set the maximum design water level of the rainwater storage tank to 1.0 meter above the ground, and the effective water depth can reach H=12 meters, which is four times that of conventional technology.

[0031] We assume that the plane area of ​​the conventional storage tank is A0, the plane area of ​​the storage tank of the embodiment of the present invention is A, and the effective volume required by the rainwater storage tank is V, then:

[0032] V=A0×H0=3m×A0

[0033] V=A×H=12m×A

[0034] Then: A / A0=3 / 12=0.25

[0035] From the above example calculation, it can be seen that the storage tank of the embodiment of the present invention has a floor area of ​​1 / 4 of that of the conventional technology. Similarly, its earth excavation is also 1 / 4 of that of the conventional technology (according to the support excavation method). At the same time, the vertical space within the floor area is fully utilized.

[0036] According to another embodiment of the present invention, a design method for an integrated prefabricated pump station is provided, which is characterized by comprising: determining the effective volume of a water collection pool and the scale of a main pump according to the design flow peak value of rainfall runoff; determining the effective volume of a regulating reservoir according to the verified design flow of rainfall runoff; wherein the design water level of the regulating reservoir is higher than the road surface at the lowest point of the sunken bridge area, and the integrated prefabricated pump station is provided with: a water inlet, which is lower than the lowest point of the sunken bridge area, for allowing rainwater to flow into the water collection pool by gravity; a main pump, for pumping the rainwater out to a downstream river channel; and a standby pump, for pumping the excess flow into the regulating reservoir when the inflow flow into the water collection pool exceeds the design flow of the water collection pool.

[0037] Specifically, Figure 4 FIG. 4 shows a technical flow chart of an integrated prefabricated pump station according to an embodiment of the present invention. Figure 4 As shown in the figure, when the rainwater flow is greater than the design capacity of the pump station, the standby pump of the pump station is started to lift the rainwater that is greater than the design capacity of the pump station and discharge it into the rainwater storage tank. Since the rainwater in the storage tank is pumped in (power), the water level in the storage tank will not be limited by the elevation of the lowest point of the road in the sunken bridge area. Therefore, the location and effective water depth of the rainwater storage tank can be flexibly designed according to the on-site conditions of the pump station.

[0038] The main design parameters of the storage pond facilities are: effective volume V, maximum design water level Z1, design bottom elevation Z2, effective water depth H, plane area A, etc. Among them:

[0039] V: Effective volume of the storage tank, that is, the rainwater runoff storage volume. Once the design standard and verification standard of the rainwater pumping station are determined, the required effective volume of the storage tank can be determined by calculation.

[0040] Z1: The highest design water level of the regulating reservoir. When rainwater is discharged into the regulating reservoir by gravity flow overflow, this water level cannot be higher than the elevation of the lowest road surface in the sunken bridge area. If an integrated prefabricated pump station with a high-level regulating reservoir is used, that is, when rainwater is discharged into the regulating reservoir through pumps and other pressurizing equipment, this water level will not be restricted by the elevation of the lowest road surface in the sunken bridge area.

[0041] Z2: Design bottom elevation of the storage tank.

[0042] H: The effective water depth of the storage pond, which is determined by subtracting the bottom elevation from the highest design water level.

[0043] A: The effective inner diameter area of ​​the storage tank.

[0044] in:

[0045] H = Z1-Z2; (Formula-1), the effective water depth is the design maximum water level minus the design bottom elevation;

[0046] V = A × H; (Formula-2), the effective volume is the effective water depth multiplied by the plane area;

[0047] A = V / H; (Formula-3), the plane area is the effective volume divided by the effective water depth.

[0048] When the design plan is to discharge rainwater runoff into the regulating reservoir through pumps and other pressurized equipment, the design maximum water level Z1 can be adjusted according to the specific situation and is not restricted by the elevation of the low point road surface in the sunken bridge area. When the area occupied by the pump station is limited, the design value of Z1 can be raised. When Z2 remains unchanged, the H value will increase (see formula-1 for details) and the area will decrease (see formula-3 for details). This can reduce the area occupied by the regulating reservoir, reduce the volume of earth excavation, and improve the utilization rate of vertical space.

[0049] In the design, if you want to reduce the excavation depth of the regulating reservoir, you can raise the bottom design elevation Z2, and you only need to determine the Z1 value according to formula -1. Therefore, the design of the regulating reservoir in the embodiment of the present invention will be more flexible, and its location, floor area, excavation earthwork, and vertical space utilization will be better.

[0050] According to an embodiment of the present invention, the design water level of the regulating reservoir is higher than the high point of the sunken bridge area.

[0051] According to an embodiment of the present invention, the regulating reservoir further includes an adjustable water discharge valve for discharging the inflow flow of the regulating reservoir into the water collection tank after the peak of the rainwater inflow, and pumping it out to the downstream river channel through the main pump.

[0052] According to an embodiment of the present invention, the design flow rate of the main pump is determined according to the following formula: Q d =qΨF, where Q d is the design flow of the main pump, q is the design intensity of the rainwater, Ψ is the comprehensive runoff coefficient, and F is the catchment area of ​​the sunken bridge area.

[0053] According to an embodiment of the present invention, the effective water depth of the storage tank is determined according to the following formula: Among them, H is the effective water depth of the storage tank, Q i is the estimated maximum inflow flow to the water collection tank, Q d is the design flow rate of the main pump, t0 is the design storage time of the regulating reservoir, t is the time from the beginning of water intake to the water level rising to the highest design water level in the regulating reservoir, and A is the cross-sectional area of ​​the cylinder of the integrated prefabricated pump station.

[0054] The present invention has the following effects:

[0055] (1) Make full use of the idle space above the integrated prefabricated pump station to reduce the floor space and excavation of rainwater storage facilities;

[0056] (2) Reduce the land acquisition and construction costs required for the construction of rainwater storage facilities.

[0057] The above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications may be made based on the following description, and these various changes, modifications, substitutions and deformations derived from the principles and spirit of the present invention still fall within the scope of protection of the present invention.

Claims

1. An integrated prefabricated pump station, characterized in that: It includes a high-level regulating reservoir, wherein the design water level of the regulating reservoir is higher than the low point of the sunken bridge area, and the integrated prefabricated pump station is provided with: an inlet, below the low point of the sunken bridge area, for allowing rainwater to flow by gravity into the sump; A main pump, used to pump the rainwater out to a downstream river; The standby pump is used to pump the excess flow into the regulating reservoir when the inflow flow into the water collection tank exceeds the design flow of the main pump.

2. The integrated prefabricated pump station according to claim 1, characterized in that: The designed water level of the regulating reservoir is higher than the high point of the sunken bridge area.

3. The integrated prefabricated pump station according to claim 1, characterized in that: The regulating reservoir also includes an adjustable water discharge valve, which is used to discharge the inflow flow of the regulating reservoir into the collection tank after the peak of rainwater inflow, and pump it out to the downstream river channel through the main pump.

4. The integrated prefabricated pump station according to claim 1, characterized in that: The regulating reservoir also includes a backup valve for replacing the adjustable drain valve in case of failure.

5. A design method for an integrated prefabricated pump station, characterized in that: include: Determine the effective volume of the water collection pool and the size of the main pump based on the design peak flow of rainfall runoff; Determine the effective volume of the storage pond based on the verified design flow of rainfall runoff; The design water level of the regulating reservoir is higher than the road surface at the lowest point of the sunken bridge area, and the integrated prefabricated pump station is provided with: an inlet, below the low point of the sunken bridge area, for allowing rainwater to flow by gravity into the sump; A main pump, used to pump the rainwater out to a downstream river; A standby pump is used to pump the excess flow into the regulating reservoir when the inflow flow into the water collection tank exceeds the design flow of the water collection tank.

6. The method according to claim 5, characterized in that The designed water level of the regulating reservoir is higher than the high point of the sunken bridge area.

7. The method according to claim 5, characterized in that The regulating reservoir also includes an adjustable water discharge valve, which is used to discharge the inflow flow of the regulating reservoir into the collection tank after the peak of the rainwater inflow, and pump it out to the downstream river channel through the main pump.

8. The method according to claim 5, characterized in that Determine the design flow rate of the main pump according to the following formula: Q d =qΨF Among them, Q d is the design flow of the main pump, q is the design intensity of the rainwater, Ψ is the comprehensive runoff coefficient, and F is the catchment area of ​​the sunken bridge area.

9. The method according to claim 8, characterized in that The effective water depth of the storage tank is determined according to the following formula: Wherein, H is the effective water depth of the storage tank, Q i is the estimated maximum inflow to the catchment, Q d is the design flow rate of the main pump, t0 is the design storage time of the regulating reservoir, t is the time from the beginning of water filling the regulating reservoir to the water level rising to the maximum design water level, and A is the cross-sectional area of ​​the cylinder of the integrated prefabricated pump station.

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