Dirt blocking device in front of diversion discharge hole

Abstract

The trash holding device in front of the diversion discharge hole comprises the diversion discharge hole, the trash holding device is arranged in front of the diversion discharge hole, the trash holding device comprises a grating dam and a grit chamber which are arranged in front of an inlet of the diversion discharge hole, the grating dam comprises a bottom plate, and circumferential steel bars and longitudinal steel bars are arranged on the bottom plate. The annular reinforcing steel bars and the longitudinal reinforcing steel bars are mutually welded to form a triangular reinforcing steel bar framework, and the grit chamber is a pit with a concrete protection wall. According to the scheme, the grit chamber intercepts coarse particles such as gravels and silt, the grating dam facilitates water flow to pass through and intercepts large-size floating objects, and under the dual action of the grit chamber and the grating dam, most of dirt such as the gravels and the silt is intercepted outside the flow guiding and discharging hole, so that the stability and the overflowing capacity of the flow guiding and discharging hole are ensured. Meanwhile, after the primary flood, silt and gravel deposited in the grit chamber and dirt hung in front of the grating dam can be conveniently cleaned.

Description

TECHNICAL FIELD

[0001] The utility model relates to a hole front dirt intercepting device of diversion discharge hole belongs to the field of water conservancy and hydropower engineering. BACKGROUND

[0002] In the water conservancy and hydropower engineering pumped storage project, diversion discharge hole has the functions of diversion during construction period and discharge of flood during operation period. During normal operation period, diversion discharge hole has been reconstructed, reinforced concrete lining or steel lining has been installed, reservoir water level exceeds dead water level, and the construction of sediment intercepting sill is completed to intercept sediment. At this time, the dirt entering the diversion discharge hole is less, and the normal operation of the diversion discharge hole is not affected. However, under normal circumstances, the sediment intercepting sill is not constructed during the early construction period, and due to the construction factors such as slope excavation and residue stacking, there are more or less problems such as residue hanging on the reservoir slope and valley. In the rainy season, stone residue, sediment and tree roots are collected in the diversion discharge hole inlet along with the rainwater, which may enter the hole. At the same time, due to the construction progress and other reasons, the diversion function of the diversion discharge hole is needed to be played as soon as possible to create conditions for dam filling. At this time, under the condition of only completing the spray mixing support, sediment, gravel and floating tree roots enter the hole, which may cause a certain threat to the stability of the hole wall and affect the flow capacity. Therefore, it is necessary to intercept as much dirt as possible outside the hole to ensure the stability and flow capacity of the diversion discharge hole. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at overcoming the shortcomings of the prior art, providing a hole front dirt intercepting device of diversion discharge hole which is relatively simple, effective, convenient to implement on site, effectively intercepts dirt, convenient to clean and ensures the stability and flow capacity of the diversion discharge hole.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A hole front dirt intercepting device of diversion discharge hole, comprising a diversion discharge hole, a dirt intercepting device is arranged in front of the diversion discharge hole, the dirt intercepting device comprises a grid dam and a sand trap arranged in front of the inlet of the diversion discharge hole, the grid dam comprises a bottom plate, ring-shaped reinforcement and longitudinal reinforcement are arranged on the bottom plate, the ring-shaped reinforcement and the longitudinal reinforcement are welded with each other to form a triangular steel reinforcement framework, and the sand trap is a pit with a concrete retaining wall.

[0006] Further, at least two drawbars are arranged on both sides of the grid dam, and the spacing L1 of each drawbar is 60 cm.

[0007] Further, the distance L2 between the grid dam and the sand trap and the inlet of the diversion discharge hole is 20 m.

[0008] Further, the height H of the grid dam is 2 m.

[0009] Furthermore, the base plate is a concrete casting plate.

[0010] The beneficial effects of the utility model are:

[0011] The grit chamber intercepts coarse particles like gravel and silt, while the screen dam facilitates water flow and intercepts large floating debris. The combined effects of the grit chamber and screen dam keep most of the debris outside the diversion and discharge tunnel, ensuring the tunnel's stability and flow capacity. Furthermore, after a flood, the sediment and gravel deposited in the grit chamber, as well as debris hanging in front of the screen dam, are easily cleaned. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of a sewage interception device in front of a diversion and discharge tunnel of the utility model;

[0013] Figure 2 This is a schematic diagram of the grid dam and grit chamber of the utility model;

[0014] Figure 3 The utility model is a schematic diagram of a slag retaining sill formed after pouring concrete in the grid dam. DETAILED DESCRIPTION

[0015] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0016] Example 1, as Figure 1 — Figure 3 As shown, a pollution-blocking device in front of a diversion and discharge hole includes a diversion and discharge hole 1. A pollution-blocking device is arranged in front of the diversion and discharge hole. The pollution-blocking device includes a screen dam 3 and a grit chamber 4 arranged in front of the inlet 2 of the diversion and discharge hole 1. The screen dam 3 includes a bottom plate 8, on which are arranged circumferential steel bars 5 and longitudinal steel bars 6. The circumferential steel bars 5 and the longitudinal steel bars 6 are welded to each other to form a triangular steel frame. The grit chamber 4 is a pit with a concrete retaining wall 9.

[0017] The diversion and discharge tunnel 1 has the functions of diverting water during the construction period and discharging floodwaters during the operation period. During the operation period, a slag barrier is set in front of the diversion and discharge tunnel. However, in the early stage of construction, the slag barrier was not implemented. In order to prevent gravel, silt, and tree roots carried by floodwater from entering the diversion and discharge tunnel 1, a sewage interception device is set in front of the diversion and discharge tunnel 1. The sewage interception device of this scheme mainly includes a grid dam 3 and a grit chamber 4. The grid dam 3 is welded by annular steel bars 5 and longitudinal steel bars 6 to form a triangular steel frame. The spacing between each steel bar is about 20 cm, which can facilitate the flow of water and intercept large floating objects such as tree roots. The triangular steel frame is inserted into the bottom plate 8, and the whole is firm. The length, width and height of the grit chamber 4 are generally about 1.5 meters, which can intercept coarse particles such as gravel and silt. The concrete retaining wall 9 can prevent the grit chamber from collapsing. During a flood, sediment and gravel accumulate in the grit chamber 4. The screen dam 3 intercepts large floating objects such as tree roots, preventing them from damaging the diversion and discharge tunnel 1, thus ensuring the tunnel's stability and flow capacity. After the flood, the sediment and gravel accumulated in the grit chamber 4 and the dirt trapped in front of the screen dam 3 are easily cleaned.

[0018] And in actual construction, after the construction is completed, if the main structure of the grid dam 3 is not deformed or damaged, the grid dam 3 can be used as the steel frame body of the slag retaining wall of the diversion discharge hole, that is, by pouring a concrete layer 12 outside the grid dam 3, a slag retaining wall 13 can be formed, saving the construction time and cost of the slag retaining wall.

[0019] Furthermore, at least two tie bars 10 are provided on both sides of the grid dam 3 , and the spacing L1 between the tie bars is 60 cm. With the tie bars, the overall structure of the grid dam is more solid.

[0020] Furthermore, the distance L2 between the screen dam 3 and the sedimentation tank 4 and the inlet 2 of the diversion and discharge hole 1 is generally about 20m, which is conducive to the sedimentation of gravel and the interception of floating objects.

[0021] Furthermore, the height H of the grid dam 3 is about 2 m, which is equivalent to the diversion and discharge hole.

[0022] Furthermore, the bottom plate 8 is a concrete casting plate, that is, a layer of concrete is cast in the soil layer, and a steel skeleton is inserted into the concrete layer, so that the overall strength of the grid dam is reliable.

[0023] The above-mentioned specific implementation methods are used to illustrate the present invention and are only preferred embodiments of the present invention, rather than limiting the present invention. Within the spirit of the present invention and the scope of protection of the claims, any modifications, equivalent replacements, improvements, etc. made to the present invention shall fall within the scope of protection of the present invention.

Claims

1. A dirt-blocking device in front of a diversion and discharge hole, comprising a diversion and discharge hole (1), wherein the dirt-blocking device is arranged in front of the diversion and discharge hole, and characterized in that: The pollution intercepting device comprises a grating dam (3) and a grit chamber (4) arranged in front of the inlet (2) of the diversion discharge hole (1); the grating dam (3) comprises a bottom plate (8); annular steel bars (5) and longitudinal steel bars (6) are arranged on the bottom plate (8); the annular steel bars (5) and the longitudinal steel bars (6) are welded to each other to form a triangular steel frame; the grit chamber (4) is a pit with a concrete retaining wall (9).

2. A drainage and discharge tunnel front-end sewage interception device as claimed in claim 1, characterized in that At least two tie bars (10) are provided on each side of the grid dam (3), and the spacing L1 between the tie bars is 60 cm.

3. A drainage and discharge tunnel front-end sewage interception device as claimed in claim 1, characterized in that The distance L2 between the screen dam (3) and the sedimentation tank (4) and the inlet (2) of the diversion and discharge hole (1) is 20m.

4. A drainage and discharge tunnel front-end sewage interception device as claimed in claim 1, characterized in that The height H of the grid dam (3) is 2m.

5. The sewage intercepting device in front of the diversion and discharge tunnel according to claim 1, characterized in that The bottom plate (8) is a concrete casting plate.

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