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Composite piano overflow weir type siphon well and method

A technology of siphon wells and overflow weirs, which is applied in the direction of waterway systems, drainage structures, water supply devices, etc., can solve the problems of insufficient mainstream diffusion distance, poor flow state in the upstream of siphon wells, and bringing into downstream box culverts, etc., to achieve enhanced single width The effect of flow capacity, reduction of slump drop, and suppression of mixing bubbles

Inactive Publication Date: 2016-03-02
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. If diversion and rectification measures are not taken in the upstream pool of the siphon well, after the inflow in the middle of the siphon well suddenly expands, the mainstream diffusion distance will not be enough, and there will be obvious backflow areas on both sides of the water inlet, resulting in poor flow state upstream of the siphon well and overflow In the middle of the weir, there will be intermittent high water bodies, which will affect the downstream flow regime
[0004] 2. Due to the low tide level in the open sea, the top of the weir of the siphon well is mostly free overflow, the fall behind the weir is too large, and a large amount of air is mixed in the process of hydraulic jump energy dissipation. If the downstream distance of the siphon well is not enough, a large number of air bubbles cannot rise to the The water surface is easily brought into the downstream box culvert, which will form a foam pollution area in the sea area near the outfall
A large amount of yellowish foam enters the sea with the drainage, which will form a foam pollution area in the sea near the drain, affecting the perception of the environmental waters, and the splashing salty mist will corrode the metal structures near the drain

Method used

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  • Composite piano overflow weir type siphon well and method
  • Composite piano overflow weir type siphon well and method
  • Composite piano overflow weir type siphon well and method

Examples

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Effect test

Embodiment 1

[0033] The present embodiment is a composite piano overflow weir type siphon well, such as figure 1 , 2 , 3, 4, and 5. This embodiment includes: at least one single well combination, the single well combination includes a vertical shaft 2 with an inlet culvert 1, the vertical shaft is connected to an overflow connection well 4, and the overflow connection well is connected to The water delivery culvert pipe 5 is connected, and a composite keyboard overflow weir 3 is provided between the shaft and the overflow connection well, see figure 1 , 2 . Described composite key overflow weir, such as figure 2 As shown, it includes: a weir body 306, the top of the weir body is staggered with positive triangular piers 303 and reverse triangular piers 305 with a horizontal bottom surface, and the bottom surfaces of the forward triangular piers and reverse triangular piers are along the direction of water flow. The length exceeds the thickness of the top of the weir body, forming a we...

Embodiment 2

[0043] This embodiment is an improvement of the first embodiment, and it is a refinement of the first embodiment about the forward and reverse triangular piers and the partition. The water-facing surface of the forward triangular pier described in this embodiment is parallel to the backwater surface of the reverse triangular pier, and the shape of the partition plate is a parallelogram conforming to the section of the forward triangular pier and the reverse triangular pier along the water flow direction. Such as Figure 5 shown.

[0044] The shape of the parallelogram partition is determined by the shape of two triangular piers, or conversely, the two bases and two hypotenuses of the partition determine the ground, the water-facing surface and the back-water surface of the two triangular piers Angle.

Embodiment 3

[0046] This embodiment is an improvement of the above embodiment, and is a refinement of the above embodiment on the forward and reverse triangular piers. The bottom angle facing the water of the forward triangular pier described in this embodiment is greater than that of the reverse triangular pier.

[0047] The specific effect produced by such a situation is: the water-facing surface of the forward triangular pier is relatively steep, while the water-facing surface of the reverse triangular pier is relatively gentle.

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Abstract

The invention relates to a compound key overflow weir type siphon well which comprises at least one single well combination. Each single well combination comprises a vertical well with a water inlet culvert pipe, the vertical wells are connected with overflow connecting wells, the overflow connecting wells are connected with water delivery culvert pipes, and compound key overflow weirs are arranged between the vertical wells and the overflow connecting wells; the compound key overflow weirs comprise weir bodies, positive triangular piers and reverse triangular piers which are provided with horizontal bottom surfaces are staggered on the tops of the weir bodies, the lengths of the bottom surfaces of the positive triangular piers and the reverse triangular piers along the direction of water flow are larger than the thicknesses of the tops of the weir bodies, and front weir cantilevers and rear weir cantilevers are formed. The compound key overflow weir type siphon well has the advantages that the compound key overflow weirs are used as flow passing facilities and bubble inhibiting schemes, accordingly, the single-width flow passing ability of the overflow weirs of the siphon well can be improved, the drop flow difference between the overflow weirs of the siphon well and open seas can be reduced, bubbles mixed in the water flow which flows through the weirs can be inhibited, and influence on ambient environments can be reduced; the engineering cost can be lowered, energy can be effectively dissipated, the bubbles can be effectively eliminated, and relatively clean water can be drained.

Description

technical field [0001] The invention relates to a composite piano overflow weir type siphon well and method, which is a hydraulic facility and method, and a drainage siphon well and method for discharging cooling water in thermal nuclear power plants. Background technique [0002] Traditional thermal nuclear power plant drainage siphon wells generally have water in the middle, and in order to reduce the impact of tide level changes in the open sea on the upstream section of the siphon well, overflow weirs with top elevations higher than the average tidal level are installed in the thermal nuclear power plant siphon wells, and the common ones are thin Wall weirs, wide-crested weirs and utility weirs. On the other hand, with the increase of power station capacity in recent years, the flow rate of the siphon well is relatively large in all seasons. In order to save construction costs, the size of the siphon well itself is often small. There are following problems in this desig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E03F5/00E03F5/04
CPCE03F5/00E03F5/04
Inventor 郭新蕾纪平杨开林夏庆福付辉王涛郭永鑫曾利秦晓张海文康占山刘赞强
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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