A water conservancy channel construction method

Abstract

The present invention provides a water conservancy channel construction method, wherein the channel connects a reservoir and a regulating reservoir, the regulating reservoir is connected to a water supply system, and the channel is a reverse slope channel. By reasonably determining various construction parameters of the channel, the channel is designed and constructed, the existing structure of the reservoir is used to renovate the gate, and a water diversion channel is built to achieve water connection and allocation between the regulating reservoir and the reservoir, thereby improving the water diversion efficiency of the reservoir. The construction method is simple and easy to implement and has high construction efficiency.

Description

[0001] Technical field: The present invention relates to the field of water conservancy projects, and in particular to a water conservancy channel construction method.

[0002] Background technology: Channels are a common form of water diversion structure in water conservancy projects. They play a role in diverting water. Channels generally take water directly from the water intake and then form a water transmission channel through gravity. However, for some reservoirs, water supply often requires the use of a regulating reservoir. Existing constructions often directly set up water transmission pipes and channels. If gravity is relied on, the elevation of the regulating reservoir will be too low, which is not conducive to water supply of the water supply system. Conventional channel construction mostly uses gravity. Even if there are reverse slope channels, they are rarely used. Conventional channel forms will lose the elevation of the regulating reservoir when connecting the reservoir and the regulating reservoir, affecting the use of the water supply system and failing to effectively utilize water resources.

[0003] Summary of the invention: In view of the problems of the prior art, the present invention provides a water conservancy channel construction method, which realizes the reasonable allocation of reservoirs and storage by reasonably setting up storage tanks and channels.

[0004] The present invention provides a water conservancy channel construction method, wherein the channel connects a reservoir and a regulating reservoir, the regulating reservoir is connected to a water supply system, the water supply system draws water from the reservoir through the regulating reservoir and the channel, the reservoir includes a dam, and the dam is provided with an overflow dam section. The method is characterized in that: the channel is a reverse slope channel, the elevation of the channel bottom gradually increases along the water flow direction of the channel, the dam top elevation of the overflow dam section is H0, the dead water level of the reservoir is Z0, the regulating reservoir has no overflow weir, the regulating reservoir is a rectangular parallelepiped structure, the bottom elevation of the regulating reservoir is H1, and the top elevation of the regulating reservoir is H2. The construction method comprises the following steps:

[0005] S1: During the dry season, the reservoir water level is lowered to below the dead water level Z0, an excavation is carried out on the left side of the dam, steel bars are tied in the excavation structure, and concrete is poured to form a gate structure of reinforced concrete structure. The gate structure is provided with only one gate, and the gate structure includes a gate chamber section and an outlet section. The gate chamber section includes a gate bottom plate, a gate slot, a left wall, a right wall, and a gate beam. The left wall and the right wall are both located on the dam body. The gate beam is located on the upper part of the left wall and the right wall and is fixedly connected to the left wall and the right wall so that the upper surface elevation of the gate bottom plate is equal to the dead water level Z0 of the reservoir; an energy dissipation device is provided at the outlet section, and the energy dissipation device includes a plurality of energy dissipation sills;

[0006] S2: A gate hoist is installed on the gate beam, and a flat gate is installed in the gate groove. The gate hoist is connected to the flat gate through a connecting rod. After the installation is completed, the flat gate is closed and falls on the gate bottom plate;

[0007] S3: At the same time as step S1, a foundation is excavated at the location of the regulating reservoir, and steel bars are tied, and concrete is poured with a formwork to form a regulating reservoir structure of a reinforced concrete structure. The regulating reservoir includes a bottom wall, a left wall, a right wall, a front wall, and a rear wall. The upper surface elevation of the bottom wall is lower than the dead water level Z0 of the reservoir. A pipe inlet is provided on the left wall, and an opening is provided on the front wall. The bottom elevation of the opening is equal to the dead water level Z0 of the reservoir. The top elevations of the left wall, the right wall, the front wall, and the rear wall are the same and higher than the dam crest elevation H0 of the overflow dam section.

[0008] S4: A pressure pipe is provided after the pipeline inlet, the pressure pipe is connected to a water pump, and the water pump is connected to a water supply system to realize water supply from the regulating reservoir to the outside;

[0009] S5: After steps S1-S4 are completed, a channel is constructed between the regulating reservoir and the outlet section of the gate structure, wherein the channel includes a channel bottom, a left channel wall and a right channel wall. The channel connects the outlet section of the gate structure and the opening of the front side wall of the regulating reservoir. At the opening of the front side wall of the regulating reservoir, the top elevations of the left channel wall and the right channel wall of the channel are equal to the top elevation of the front side wall.

[0010] Preferably, the slope of the bottom slope of the channel is less than 0.5%, and the elevation of the opening of the channel at the front side wall of the storage tank is higher than the elevation of the outlet section of the channel at the gate structure.

[0011] Preferably, the upper surface elevation of the bottom wall of the regulating reservoir is at least 1m lower than the dead water level Z0 of the reservoir, and the top elevations of the left wall, right wall, front wall and rear wall are at least 2m higher than the dam top elevation H0 of the overflow dam section.

[0012] Preferably, the top elevations of the left side wall, right side wall, front side wall and rear side wall are equal to the verified flood level of the reservoir.

[0013] The working principle of the present invention is as follows:

[0014] For a reservoir, its water level fluctuates from the dead water level to the high water level. For the present invention, the reservoir should be a small reservoir with poor regulation ability, and its water level fluctuates greatly. When the reservoir water level is above the dead water level, the reservoir water passes through the gate and the outlet section to the channel. The channel is a reverse slope channel, and its water volume can flow into the regulating reservoir, and ensure that the water volume in the regulating reservoir is flush with the reservoir water level. Through this setting method, the synchronous change of the regulating reservoir and the reservoir water level can be guaranteed, and the elevation of the regulating reservoir can be increased to ensure the water supply head requirement of the regulating reservoir.

[0015] During dam construction, the concrete dam body can be excavated, and the dam surface formed by the excavation can be used to set steel bars and tie them to form a steel cage for the gate structure. Since a single-hole gate is set, the foundation formed by the dam body excavation can be fully utilized to fix the gate slot structure. The left and right walls are built on the top surface of the dam body, and the left and right walls are used to build a fixed gate beam. A hoist base is set on the gate beam for fixing the hoist. During construction, a hole can be preset on the gate beam for the connecting rod to pass through the hole structure and connect with the flat gate.

[0016] The construction of the regulating reservoir should ensure the control of various elevations. The elevation of the bottom of the regulating reservoir should be lower than the dead water level of the reservoir, and the bottom elevation of the opening on the front side wall of the regulating reservoir should be equal to the dead water level Z0 of the reservoir, so as to ensure that when the water level of the reservoir is greater than the dead water level, water can be diverted to the regulating reservoir through the channel. The elevation of the top of the regulating reservoir should be greater than the historical maximum water level of the reservoir. When there is no data, the verified flood level of the reservoir or a safety margin can be reserved based on the elevation of the overflow dam section.

[0017] The opening of the front side wall of the regulating reservoir should be reserved before the construction of the front side wall of the regulating reservoir. When tying the steel cage of the front side wall, the opening position should be reserved. When pouring concrete, formwork should be set on both sides of the front side wall opening to form a front side wall with an opening.

[0018] A channel is constructed between the regulating reservoir and the outlet section of the gate structure. A transition connection section should be set between the channel and the regulating reservoir and the gate structure to ensure the continuity of the water flow. When the transition section is a curved surface, it can be carried out by a slipform construction method to form a curved surface structure. An energy dissipation device is set at the outlet section of the gate structure to prevent the water flow formed by the discharge of the gate structure from impacting the channel structure. The channel can be lined with plain concrete with a concrete strength of not less than C20.

[0019] The advantages of the present invention are:

[0020] The present invention provides a water conservancy channel construction method, wherein the channel connects a reservoir and a regulating reservoir, the regulating reservoir is connected to a water supply system, and the channel is a reverse slope channel. By reasonably determining various construction parameters of the channel, the channel is designed and constructed, the existing structure of the reservoir is used to renovate the gate, and a water diversion channel is built to achieve water connection and allocation between the regulating reservoir and the reservoir, thereby improving the water diversion efficiency of the reservoir. The construction method is simple and easy to implement and has high construction efficiency. Description of the drawings:

[0021] Figure 1 Schematic diagram of the gate structure;

[0022] Figure 2 This is a schematic diagram of the storage tank structure;

[0023] Figure 3This is a schematic diagram of the connection between the reservoir, storage tank and channel.

[0024] Specific implementation method: The following is a specific explanation of the content defined in the present invention with reference to the contents of the drawings in the specification.

[0025] The present invention provides a construction method for a water conservancy channel 1, wherein the channel 1 connects a reservoir and a regulating reservoir, the regulating reservoir is connected to a water supply system, the water supply system draws water from the reservoir through the regulating reservoir and the channel 1, the reservoir includes a dam 2, and the dam 2 is provided with an overflow dam section. The method is characterized in that: the channel 1 is a reverse slope channel, the elevation of the channel bottom gradually increases along the water flow direction of the channel 1, the dam top elevation of the overflow dam section is H0, the dead water level of the reservoir is Z0, the regulating reservoir has no overflow weir, the regulating reservoir is a rectangular parallelepiped structure, the bottom elevation of the regulating reservoir is H1, and the top elevation of the regulating reservoir is H2. The construction method comprises the following steps:

[0026] S1: During the dry season, the water level of the reservoir is lowered to below the dead water level Z0, an excavation is carried out on the left side of the dam 2, and steel bars are tied in the excavation structure and concrete is poured to form a gate structure of reinforced concrete structure. The gate structure is provided with only one gate hole. The gate structure includes a gate chamber section and an outlet section 30. The gate chamber section includes a gate bottom plate 31, a gate slot, a left wall 32, a right wall 33, and a gate beam 34. The left wall 32 and the right wall 33 are both located on the dam body of the dam 2. The gate beam 34 is located on the upper part of the left wall 32 and the right wall 33 and is fixedly connected to the left wall 32 and the right wall 33 so that the upper surface elevation of the gate bottom plate 31 is equal to the dead water level Z0 of the reservoir; the outlet section 30 is provided with an energy dissipation device, which includes a plurality of energy dissipation sills;

[0027] S2: A hoist 35 is installed on the gate beam 34, and a flat gate 36 is installed in the gate groove. The hoist 35 is connected to the flat gate 36 through a connecting rod 37. After the installation is completed, the flat gate 36 is closed and falls onto the gate bottom plate 31;

[0028] S3: At the same time as step S1, a foundation is excavated at the location of the regulating reservoir, and steel bars are tied, and concrete is poured with a formwork to form a regulating reservoir structure of a reinforced concrete structure. The regulating reservoir includes a bottom wall 41, a left side wall 42, a right side wall 43, a front side wall 44, and a rear side wall 45. The upper surface elevation of the bottom wall 41 is lower than the dead water level Z0 of the reservoir. A pipe inlet 46 is provided on the left side wall 42, and an opening is provided on the front side wall 44. The bottom elevation of the opening is equal to the dead water level Z0 of the reservoir. The top elevations of the left side wall 42, the right side wall 43, the front side wall 44, and the rear side wall 45 are the same and higher than the dam top elevation H0 of the overflow dam section.

[0029] S4: A pressure pipe is provided after the pipe inlet 46, the pressure pipe is connected to a water pump, and the water pump is connected to a water supply system to supply water from the regulating reservoir to the outside;

[0030] S5: After steps S1-S4 are completed, a channel 1 is constructed between the regulating reservoir and the outlet section 30 of the gate structure, wherein the channel 1 includes a channel bottom, a left channel wall and a right channel wall. The channel 1 connects the outlet section 30 of the gate structure and the opening of the front side wall 44 of the regulating reservoir. At the opening of the front side wall 44 of the regulating reservoir, the top elevations of the left channel wall and the right channel wall of the channel 1 are equal to the top elevation of the front side wall 44.

[0031] During actual operation, the flat plate gate 36 is opened and maintained in a normally open state. The bottom elevation of the flat plate gate 36 is higher than the dam crest elevation H0 of the overflow dam section. The reservoir water flows into the regulating reservoir through the gate structure and channel 1 to meet the needs of the water supply system. When a special situation arises and the flat plate gate 36 needs to be closed, the hoist 35 is used to close the flat plate gate 36 and cut off the water supply to channel 1. During construction, it should be ensured that when the flat plate gate 36 is at its maximum lifting height, the bottom elevation of the flat plate gate 36 is higher than the dam crest elevation H0 of the overflow dam section.

[0032] The direction of water flow along the channel 1 is the direction from the reservoir to the regulating reservoir; the bottom elevation H1 of the regulating reservoir is the upper surface elevation of the bottom wall 41, and the top elevation H2 of the regulating reservoir is the top elevation of the left side wall 42, the right side wall 43, the front side wall 44 and the rear side wall 45.

[0033] Preferably, the bottom slope of the channel 1 is less than 0.5%, and the elevation of the channel 1 at the opening of the front side wall 44 of the storage tank is higher than the elevation of the channel 1 at the outlet section 30 of the gate structure. The channel 1 is lined with concrete with a strength of not less than C20 and a thickness of not less than 15 cm.

[0034] Preferably, the upper surface elevation of the bottom wall 41 of the regulating reservoir is at least 1 m lower than the dead water level Z0 of the reservoir, and the top elevations of the left side wall 42, the right side wall 43, the front side wall 44 and the rear side wall 45 are at least 2 m higher than the dam top elevation H0 of the overflow dam section.

[0035] Preferably, the top elevations of the left side wall 42, the right side wall 43, the front side wall 44, and the rear side wall 45 are equal to the check flood level of the reservoir. The top elevations of the left side wall 42, the right side wall 43, the front side wall 44, and the rear side wall 45 are set to prevent the reservoir from overflowing during floods, causing the water level in the regulating reservoir to exceed the top elevations of the left side wall 42, the right side wall 43, the front side wall 44, and the rear side wall 45, thereby causing water to overflow. Setting the top elevations of the left side wall 42, the right side wall 43, the front side wall 44, and the rear side wall 45 can ensure that the water in the regulating reservoir does not overflow under any operating condition of the reservoir. The check flood level can be determined according to the design standard of the reservoir. When there is no check flood level, the design flood level corresponding to the design flood standard of the reservoir dam 2 plus 1m can also be selected.

[0036] The above embodiments are only preferred embodiments of the present invention. The protection scope of the present invention should not be regarded as limited to the specific forms described in the embodiments. The protection scope of the present invention also includes equivalent technical means that can be thought of by those skilled in the art based on the concept of the present invention.

Claims

1. A method for constructing a water conservancy channel, wherein the channel connects a reservoir and a regulating reservoir, the regulating reservoir is connected to a water supply system, the water supply system draws water from the reservoir through the regulating reservoir and the channel, the reservoir includes a dam, and the dam is provided with an overflow dam section, characterized in that: The channel is a reverse slope channel. Along the water flow direction of the channel, the elevation of the channel bottom gradually increases. The dam top elevation of the overflow dam section is H0. The dead water level of the reservoir is Z0. The regulating reservoir has no overflow weir. The regulating reservoir is a rectangular parallelepiped structure. The bottom elevation of the regulating reservoir is H1. The top elevation of the regulating reservoir is H2. The construction method comprises the following steps: S1: During the dry season, the reservoir water level is lowered to below the dead water level Z0, an excavation is carried out on the left side of the dam, steel bars are tied in the excavation structure, and concrete is poured to form a gate structure of reinforced concrete structure. The gate structure is provided with only one gate, and the gate structure includes a gate chamber section and an outlet section. The gate chamber section includes a gate bottom plate, a gate slot, a left wall, a right wall, and a gate beam. The left wall and the right wall are both located on the dam body. The gate beam is located on the upper part of the left wall and the right wall and is fixedly connected to the left wall and the right wall so that the upper surface elevation of the gate bottom plate is equal to the dead water level Z0 of the reservoir; an energy dissipation device is provided at the outlet section, and the energy dissipation device includes a plurality of energy dissipation sills; S2: A gate hoist is installed on the gate beam, and a flat gate is installed in the gate groove. The gate hoist is connected to the flat gate through a connecting rod. After the installation is completed, the flat gate is closed and falls on the gate bottom plate; S3: At the same time as step S1, a foundation is excavated at the location of the regulating reservoir, and steel bars are tied, and concrete is poured with a formwork to form a regulating reservoir structure of a reinforced concrete structure. The regulating reservoir includes a bottom wall, a left wall, a right wall, a front wall, and a rear wall. The upper surface elevation of the bottom wall is lower than the dead water level Z0 of the reservoir. A pipe inlet is provided on the left wall, and an opening is provided on the front wall. The bottom elevation of the opening is equal to the dead water level Z0 of the reservoir. The top elevations of the left wall, the right wall, the front wall, and the rear wall are the same and higher than the dam crest elevation H0 of the overflow dam section. S4: A pressure pipe is provided after the pipeline inlet, the pressure pipe is connected to a water pump, and the water pump is connected to a water supply system to realize water supply from the regulating reservoir to the outside; S5: After steps S1-S4 are completed, a channel is constructed between the regulating reservoir and the outlet section of the gate structure, wherein the channel includes a channel bottom, a left channel wall and a right channel wall. The channel connects the outlet section of the gate structure and the opening of the front side wall of the regulating reservoir. At the opening of the front side wall of the regulating reservoir, the top elevations of the left channel wall and the right channel wall of the channel are equal to the top elevation of the front side wall.

2. The water conservancy channel construction method according to claim 1, characterized in that: The slope of the bottom slope of the channel is less than 0.5%, and the elevation of the opening of the channel at the front side wall of the storage tank is higher than the elevation of the outlet section of the channel at the gate structure.

3. The water conservancy channel construction method according to claim 1, characterized in that: The upper surface elevation of the bottom wall of the regulating reservoir is at least 1m lower than the dead water level Z0 of the reservoir, and the top elevations of the left side wall, right side wall, front side wall and rear side wall are at least 2m higher than the dam top elevation H0 of the overflow dam section.

4. The water conservancy channel construction method according to claim 1, characterized in that: The top elevations of the left side wall, right side wall, front side wall and rear side wall are equal to the verified flood level of the reservoir.

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