Water conservancy project open channel diversion structure

Abstract

According to the technical scheme, the water conservancy project open channel diversion structure comprises a river channel and a diversion open channel. The diversion channel is arranged on one side of the river channel; a water inlet and a water outlet of the diversion channel are communicated with the river channel; an upstream cofferdam and a downstream cofferdam are arranged between the water inlet and the water outlet of the diversion channel in the river channel; construction foundation pits are distributed in the upstream cofferdam and the downstream cofferdam; wherein the upstream cofferdam is arranged at the intersection of a river channel and a water inlet of the diversion channel; and the downstream cofferdam is arranged at the intersection of the river channel and the water outlet of the diversion channel. The water flow form of a traditional diversion channel can be improved, and the influence of water flow scouring is reduced; the open channel excavation length is obviously shortened, the open channel excavation work amount is reduced, the occupied area is preferentially reduced, and therefore the purpose of reducing investment is achieved; the area of the foundation pit is increased, and construction of a protected main building is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of water conservancy engineering diversion, and in particular relates to an open channel diversion structure of a water conservancy engineering. Background Art

[0002] In the construction of water conservancy projects involving cross-river sections, in order to facilitate construction, it is necessary to form a dry foundation pit in a certain river section. Construction diversion is the most important measure to form a dry foundation pit in the river section of the water conservancy project, and open channel diversion is one of the most commonly used diversion methods for construction diversion, which is mainly used in situations where the river channel is narrow, the terrain on both sides of the river channel is flat and the space is large. The general procedure of open channel diversion is to first excavate the diversion open channel according to the design section size and layout to form a flow passage, and then fill the upstream cofferdam at a distance downstream of the open channel inlet river channel, and fill the downstream cofferdam at a distance upstream of the open channel outlet river channel to guide the river to divert, and finally drain the foundation pit between the upstream and downstream cofferdams to form dry land construction conditions. Under normal circumstances, in order to prevent the cofferdam from being eroded by water flow, the inlet and outlet of the diversion open channel need to be kept at a certain distance from the upstream and downstream cofferdams respectively. However, the layout of this type of diversion structure prevents a series of problems such as poor diversion water flow morphology, large engineering volume, and large area occupied.

[0003] Specifically, in the traditional open channel diversion arrangement, the inlet and outlet of the diversion open channel are respectively at a certain distance from the upstream and downstream cofferdams. On the one hand, the pointed convex soil formed by the inlet slope of the open channel has an impact on the water flow and disrupts the water flow pattern. On the other hand, vortices are easily formed near the water-facing side slopes of the upstream and downstream cofferdams, which scour the water-facing side slopes of the cofferdams. At the same time, in order to ensure the length of the foundation pit and avoid extending the distance of the open channel, the open channel construction volume is large and occupies a large area. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings of the above-mentioned background technology and provide an open channel diversion structure for water conservancy projects, which can improve the water flow form of traditional diversion open channels and reduce the impact of water flow scouring; significantly shorten the open channel excavation length, reduce the open channel excavation project volume, and give priority to reducing the floor area, thereby achieving the purpose of reducing investment; increase the foundation pit area, and facilitate the construction of the protected main building.

[0005] The technical scheme adopted by the utility model is: an open channel diversion structure of a water conservancy project, comprising a river channel and a diversion open channel; the diversion open channel is arranged at one side of the river channel; the water inlet and the water outlet of the diversion open channel are connected with the river channel; an upstream cofferdam and a downstream cofferdam are arranged between the water inlet and the water outlet of the diversion open channel in the river channel; construction foundation pits are distributed in the upstream cofferdam and the downstream cofferdam; wherein the upstream cofferdam is arranged at the intersection of the river channel and the water inlet of the diversion open channel; and the downstream cofferdam is arranged at the intersection of the river channel and the water outlet of the diversion open channel.

[0006] In the above technical solution, the water-facing side of the upstream cofferdam and the slope of the diversion open channel water inlet are smoothly transitioned.

[0007] In the above technical solution, the water-facing side of the downstream cofferdam and the slope of the diversion open channel water inlet are smoothly transitioned.

[0008] In the above technical solution, the axis of the upstream cofferdam is parallel to the center line of the water inlet of the diversion open channel.

[0009] In the above technical solution, the axis of the downstream cofferdam is parallel to the center line of the outlet of the diversion open channel.

[0010] In the above technical solution, a block stone structure for slope protection is arranged on the water side of the upstream cofferdam.

[0011] In the above technical solution, a block stone structure for slope protection is arranged on the water side of the downstream cofferdam.

[0012] In the above technical solution, the thickness of the block stone structure on the water side of the upstream cofferdam is not less than 20 cm.

[0013] In the above technical solution, the thickness of the block stone structure on the water side of the downstream cofferdam is not less than 20 cm.

[0014] The beneficial effects of the utility model are as follows: the utility model can solve the problems existing in the layout of diversion buildings in the traditional open channel diversion method, and provide an open channel diversion layout with good water flow shape, short open channel length, small excavation amount, small footprint, and large construction working surface.

[0015] In the open channel diversion arrangement of the utility model, the axes of the upstream and downstream cofferdams are respectively consistent with the center lines of the inlet and outlet of the open channel, and the water-facing sides of the upstream and downstream cofferdams are seamlessly connected with the open channel slopes, eliminating the pointed convex soil and water backflow space formed by the open channel inlet slope, and the water flow shape is better. Block stone slope protection is used on the water-facing sides of the upstream and downstream cofferdams to reduce the impact of water scouring.

[0016] In the open channel diversion arrangement of the utility model, the upstream and downstream cofferdams are respectively arranged adjacent to the inlet and outlet of the open channel, and the axes of the upstream and downstream cofferdams are respectively consistent with the center lines of the inlet and outlet of the open channel. On the one hand, under the premise of ensuring the same foundation pit area, the length of the open channel in the utility model is shorter, so that the excavation volume of the open channel is smaller and the occupied area is smaller; on the other hand, since the upstream and downstream cofferdams form an "eight" shape arrangement, the foundation pit area is larger and more convenient for construction.

[0017] The water-facing sides of the upstream cofferdam and the downstream cofferdam of the utility model both adopt block stone structures for slope protection, which effectively prevents water flow scouring and damage, and further ensures the safety of foundation pit construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of an application scenario of the utility model;

[0019] Figure 2 It is a structural schematic diagram of the utility model.

[0020] 1- river channel, 11- river bottom, 12- bank slope, 13- ground; 2- diversion open channel, 21- water inlet, 22- water outlet, 23- open channel slope, 3- construction foundation pit, 4- upstream cofferdam, 5- downstream cofferdam, 6- block stone structure. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not constitute a limitation on the present invention.

[0022] like Figure 1 As shown, the utility model is applied to the construction of water conservancy projects across river sections. To facilitate the construction, a dry foundation pit needs to be formed in a certain river section. It is mainly used in situations where the river channel 1 is narrow and the terrain on both sides of the river channel 1 is flat and the space is large.

[0023] The river channel 1 used in this embodiment has bank slopes 12 on both sides of the river channel 1 , and a large ground 13 is provided outside the bank slopes 12 .

[0024] like Figure 2 As shown, the utility model provides an open channel diversion structure of a water conservancy project, comprising a river channel 1 and a diversion open channel 2; the diversion open channel 2 is arranged at one side of the river channel 1; the water inlet 21 and the water outlet 22 of the diversion open channel 2 are connected to the river channel 1; an upstream cofferdam 4 and a downstream cofferdam 5 are arranged between the water inlet 21 and the water outlet 22 of the diversion open channel 2 in the river channel 1; construction foundation pits 3 are distributed in the upstream cofferdam 4 and the downstream cofferdam 5; wherein the upstream cofferdam 4 is arranged at the intersection of the river channel 1 and the water inlet 21 of the diversion open channel 2; the downstream cofferdam 5 is arranged at the intersection of the river channel 1 and the water outlet 22 of the diversion open channel 2. In the open channel diversion arrangement of the utility model, the upstream cofferdam 4 and the downstream cofferdam 5 are respectively arranged adjacent to the water inlet 21 and the water outlet 22 of the diversion open channel 2. Under the premise of ensuring the same foundation pit area, the length of the open channel in the utility model is shorter, so that the open channel excavation volume is smaller and the occupied area is smaller; on the other hand, since the upstream and downstream cofferdams 5 form an "eight" shape arrangement, the foundation pit area is larger and more convenient for construction.

[0025] Specifically, the diversion open channel 2 includes open channel slopes 23 located on both sides of the channel bottom. Figure 1 and 2The arrow in the figure indicates the direction of water flow. The water flow in the river channel 1 enters the water inlet 21 of the diversion open channel 2 from the river channel 1, flows out from the water outlet 22 of the diversion open channel 2, and returns to the river channel 1, that is, bypasses the construction foundation pit 3 through the diversion open channel 2. The upstream cofferdam 4, the downstream cofferdam 5 and the open channel slope 23 cooperate with each other to form a continuously distributed overall structure, which serves as a water retaining structure for the construction foundation pit 3 and effectively ensures the safety of the construction process.

[0026] Specifically, the water-facing side of the upstream cofferdam 4 smoothly transitions with the slope of the water inlet of the diversion open channel 2. The water-facing side of the downstream cofferdam 5 smoothly transitions with the slope of the water outlet of the diversion open channel 2. The water-facing side of the upstream cofferdam 4 is seamlessly connected to the slope of the corresponding water inlet of the diversion open channel 2 to form a whole, which effectively enhances the overall stability of the open channel slope 23 and the upstream cofferdam 4. The water-facing side of the downstream cofferdam 5 is seamlessly connected to the slope of the corresponding water outlet of the diversion open channel 2 to form a whole, which effectively enhances the overall stability of the open channel slope 23 and the downstream cofferdam 5.

[0027] Specifically, the axis of the upstream cofferdam 4 is parallel to the center line of the water inlet 21 of the diversion open channel 2. The axis of the downstream cofferdam 5 is parallel to the center line of the water outlet 22 of the diversion open channel 2. The bank slopes 12 of the water inlet 21 and the water outlet 22 of the diversion open channel 2 cooperate with the upstream cofferdam 4 and the downstream cofferdam 5 to form a smooth slope structure, which avoids the impact of the pointed convex soil on the water flow and disturbing the water flow pattern; at the same time, the smooth slope structure can reduce the water flow backflow space, thereby avoiding the formation of vortices near the water side slopes of the upstream cofferdam 4 and the downstream cofferdam 5, reducing the scouring of the water side slopes of the upstream cofferdam 4 and the downstream cofferdam 5, and making the water flow pattern better.

[0028] Specifically, a block stone structure 6 for slope protection is provided on the water side of the upstream cofferdam 4. A block stone structure 6 for slope protection is provided on the water side of the downstream cofferdam 5. The thickness of the block stone structure 6 on the water side of the upstream cofferdam 4 is not less than 20 cm. The thickness of the block stone structure 6 on the water side of the downstream cofferdam 5 is not less than 20 cm. In order to prevent the water side of the upstream cofferdam 4 and the downstream cofferdam 5 from being eroded and damaged by the water flow, block stone slope protection is carried out on the water side of the upstream cofferdam 4 and the downstream cofferdam 5. The thickness of the slope protection is determined according to the water flow velocity on the water side and is not less than 20 cm to prevent erosion and damage by the water flow.

[0029] The design process of the utility model includes:

[0030] 1) According to the set flow rate of diversion open channel 2 and the water level of river 1, the cross-sectional dimensions of diversion open channel 2 are planned, the flow velocities at the inlet and outlet of diversion open channel 2 are calculated, and the turning radius R of the inlet and outlet of the open channel is determined according to relevant specifications, and then the inlet and outlet centerline direction angles α and β of the diversion open channel 2 are determined.

[0031] 2) According to the centerline direction of the inlet and outlet of the diversion open channel 2, the axial direction angles of the upstream and downstream cofferdams 5 are determined to be α and β respectively; then, combined with the proposed cofferdam slope ratio, the axial positions of the upstream and downstream cofferdams 5 are determined, and then the layout of the upstream and downstream cofferdams 5 is determined to ensure that the water-side slopes of the upstream and downstream cofferdams 5 are smoothly connected with the open channel bank slope 12.

[0032] 3) In order to prevent the water side of the upstream and downstream cofferdams 5 from being eroded and damaged by water flow, block stone slope protection is designed for the water side slope of the upstream and downstream cofferdams 5. The thickness of the slope protection is determined according to the water flow velocity on the water side of the upstream and downstream cofferdams 5, and is generally not less than 20cm to prevent water flow erosion and damage.

[0033] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. An open channel diversion structure for a water conservancy project, characterized in that: It includes a river channel and an open diversion channel; the open diversion channel is arranged on one side of the river channel; the water inlet and the water outlet of the open diversion channel are connected with the river channel; an upstream cofferdam and a downstream cofferdam are arranged between the water inlet and the water outlet of the open diversion channel in the river channel; construction foundation pits are distributed in the upstream cofferdam and the downstream cofferdam; among them, the upstream cofferdam is arranged at the intersection of the river channel and the water inlet of the open diversion channel; the downstream cofferdam is arranged at the intersection of the river channel and the water outlet of the open diversion channel.

2. The open channel diversion structure of a water conservancy project according to claim 1, characterized in that: The water-facing side of the upstream cofferdam and the side slope of the diversion open channel water inlet are smoothly transitioned.

3. The open channel diversion structure of a water conservancy project according to claim 1, characterized in that: The water-facing side of the downstream cofferdam and the side slope of the diversion open channel outlet are smoothly transitioned.

4. The open channel diversion structure of a water conservancy project according to claim 1, characterized in that: The axis of the upstream cofferdam is parallel to the center line of the water inlet of the diversion open channel.

5. The open channel diversion structure of a water conservancy project according to claim 1, characterized in that: The axis of the downstream cofferdam is parallel to the center line of the water outlet of the diversion open channel.

6. The open channel diversion structure of a water conservancy project according to claim 1, characterized in that: A block stone structure for slope protection is arranged on the water side of the upstream cofferdam.

7. The open channel diversion structure of a water conservancy project according to claim 1, characterized in that: A block stone structure for slope protection is arranged on the water side of the downstream cofferdam.

8. The open channel diversion structure of a water conservancy project according to claim 6, characterized in that: The thickness of the block stone structure on the water side of the upstream cofferdam is not less than 20 cm.

9. The open channel diversion structure of a water conservancy project according to claim 7, characterized in that: The thickness of the block stone structure on the water side of the downstream cofferdam is not less than 20 cm.

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