CN215841761U - Simple sedimentation tank suitable for large flow behind weir - Google Patents
Simple sedimentation tank suitable for large flow behind weir Download PDFInfo
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- CN215841761U CN215841761U CN202122259102.3U CN202122259102U CN215841761U CN 215841761 U CN215841761 U CN 215841761U CN 202122259102 U CN202122259102 U CN 202122259102U CN 215841761 U CN215841761 U CN 215841761U
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Abstract
The utility model discloses a simple sedimentation tank suitable for large flow behind a weir, which takes a concrete cofferdam and an earth-rock cofferdam of a foundation pit as the side edges of the sedimentation tank, and builds the other cofferdams of the sedimentation tank to form the sedimentation tank by being surrounded with the concrete cofferdam and the earth-rock cofferdam; the sedimentation tank comprises a primary sedimentation tank and a secondary sedimentation tank, the primary sedimentation tank and the secondary sedimentation tank are connected through a sub weir, and waste water in the foundation pit is discharged after being precipitated through the primary sedimentation tank and the secondary sedimentation tank in sequence. The utility model has reasonable structural design and simple and convenient construction, can quickly precipitate and clear wastewater and sewage, does not influence the construction of surrounding buildings during construction and operation, can select and use the stone slag in the foundation pit as the material, adjusts the capacity according to the actual discharge amount according to local conditions during filling, is not limited by space, and effectively improves the working efficiency.
Description
Technical Field
The utility model relates to the technical field of hydraulic and hydroelectric engineering, in particular to a simple sedimentation tank behind a weir, which is suitable for large flow, is used for solving the problems of sedimentation and drainage of construction water, foundation pit river water and cofferdam leakage water generated in the construction process after river closure in the hydraulic and hydroelectric engineering, and meets the requirements of sewage and wastewater drainage and environmental protection in construction.
Background
The main body construction in the foundation pit is carried out by adopting a cofferdam closure type in the water conservancy and hydropower engineering, and the diversion is carried out by a drainage building. A large amount of sewage and waste water can be generated in the construction processes of cofferdam filling, foundation pit excavation, supporting, concrete and the like, and the foundation pit has more buildings, limited space and no condition of setting a large-capacity sedimentation tank. And the conventional sedimentation tank is adopted, the reinforced concrete structure has complex construction, high cost and small capacity, and cannot meet the requirements of large-flow discharge of construction wastewater and environmental protection.
In the foundation pit building construction process, conventional sedimentation tank need be according to the construction period of difference, constantly move and put, need consume manpower and materials in a large number, seriously influence the efficiency of construction.
In view of the above circumstances, it is necessary to develop a simple large-capacity weir-rear type sedimentation tank, which can quickly clear and discharge a large amount of sewage and wastewater and meet the requirements of large-flow discharge and environmental protection; the filling materials of the sedimentation tank can be obtained from local materials, the construction is convenient, and the cost is low; during construction and operation, the construction of surrounding buildings is not influenced, and the capacity of the building can be adjusted according to the actual discharge amount according to local conditions; the device is not limited by space, and the working efficiency is effectively improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problems and provides the simple sedimentation tank behind the weir, which has large capacity, high cleaning and discharging speed and convenient construction and meets the requirements of cleaning and discharging sewage and waste water in construction and the environmental protection requirement.
A simple sedimentation tank suitable for large flow behind a weir takes a concrete cofferdam and an earth-rock cofferdam of a foundation pit as the side edges of the sedimentation tank, and the rest cofferdams of the sedimentation tank are built to be enclosed with the concrete cofferdam and the earth-rock cofferdam to form the sedimentation tank; the sedimentation tank comprises a primary sedimentation tank and a secondary sedimentation tank, the primary sedimentation tank and the secondary sedimentation tank are connected through a sub weir, and waste water in the foundation pit is discharged after being precipitated through the primary sedimentation tank and the secondary sedimentation tank in sequence. The sedimentation tank sets up the cofferdam rear side at the foundation ditch, makes things convenient for the sewage in the direct processing foundation ditch to enclose with the help of the cofferdam of foundation ditch or peripheral building and keep off and form the sedimentation tank, the capacity size of sedimentation tank can set up as required, does not receive the restriction of foundation ditch inner space, need not move because of the construction in the foundation ditch, has improved the efficiency of construction greatly.
The further technical scheme is as follows: a water collecting well is arranged in the foundation pit, and a water drainage tank communicated to the sedimentation tank is arranged in the water collecting well.
The further technical scheme is as follows: the first-stage sedimentation tank is formed by enclosing a concrete cofferdam, an earth-rock cofferdam, a first cofferdam and a sub-dam.
The further technical scheme is as follows: the secondary sedimentation tank is formed by enclosing a concrete cofferdam, a sub-weir and a second cofferdam.
The further technical scheme is as follows: and the first cofferdam, the second cofferdam and the sub-dams are all filled with stone slag of excavation materials of the foundation pit. The filling material of the sedimentation tank is made of local materials, so that the construction cost is greatly reduced, and the construction is more convenient.
The further technical scheme is as follows: the inside clay core wall that is equipped with of first cofferdam, the facing water side of first cofferdam builds the dry stone bank protection of 50cm thick by laying bricks or stones. The clay core wall can prevent that waste water from oozing outside the cofferdam, and the dry masonry bank protection can prevent rivers and erode to the protection sedimentation tank cofferdam.
The further technical scheme is as follows: the facing side of the second cofferdam is built with a 50cm thick dry masonry revetment, and the back side is laid with a layer of composite geotextile.
The further technical scheme is as follows: and one side of the sub-weir close to the primary sedimentation tank is paved with a layer of composite geotextile.
The further technical scheme is as follows: the slope ratio of the two sides of the first cofferdam, the second cofferdam and the sub-weir is 1: 1.
The further technical scheme is as follows: the water collecting well and the sedimentation tank are respectively arranged at two sides of the earth-rock cofferdam.
The utility model has the beneficial effects that: the utility model utilizes the principle of retaining water of the water retaining cofferdam of the foundation pit, adopts the earth-rock cofferdam or peripheral buildings for retaining to form a pit-shaped sedimentation tank, covers geotextile in the sedimentation tank, utilizes the characteristic of composite geotextile to filter wastewater through geotextile and carry out secondary sedimentation in the sedimentation tank, and after the wastewater is kept still for a long time to reach relevant standards, the wastewater is rapidly discharged through the weir body of the secondary sedimentation tank, thereby meeting the requirement of large-flow discharge.
The utility model has reasonable structural design and simple and convenient construction, can quickly precipitate and clear wastewater and sewage, does not influence the construction of surrounding buildings during construction and operation, can select and use the stone slag in the foundation pit as the material, adjusts the capacity according to the actual discharge amount according to local conditions during filling, is not limited by space, and effectively improves the working efficiency.
Drawings
FIG. 1 is a schematic plan view of a post-weir sedimentation tank of the present invention;
FIG. 2 is a sectional view of the settling tank weir 1-1 of FIG. 1;
FIG. 3 is a sectional view of the primary settling tank cofferdam 2-2 of FIG. 1;
fig. 4 is a sectional view of the secondary settling tank cofferdam 3-3 in fig. 1.
In the figure: 1. the primary sedimentation tank, 2, the second grade sedimentation tank, 3, the earth-rock cofferdam, 4, the concrete cofferdam, 5, first cofferdam, 6, the second cofferdam, 7, the sub-weir, 8, compound geotechnological cloth, 9, clay core wall, 10, the dry stone bank protection, 11, foundation ditch, 12, sump pit.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., appear based on the directions or positional relationships shown in the drawings, which are merely for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed in a specific direction and operation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
A simple sedimentation tank suitable for large flow behind a weir is disclosed, as shown in figure 1, a concrete cofferdam 4 and an earth-rock cofferdam 3 of a foundation pit 11 are taken as the side edges of the sedimentation tank, and the rest cofferdams of the sedimentation tank are built to be enclosed with the concrete cofferdam 4 and the earth-rock cofferdam 3 to form a pit-shaped sedimentation tank. The sedimentation tank includes one-level sedimentation tank 1 and second grade sedimentation tank 2, connects through sub-weir 7 between one-level sedimentation tank 1 and the second grade sedimentation tank 2, and waste water in the foundation ditch 11 passes through the sedimentation of one-level sedimentation tank 1 and second grade sedimentation tank 2 in proper order, filters, discharges through the sedimentation tank cofferdam weir body of second grade sedimentation tank 2 after reaching the standard.
The sedimentation tank sets up at the rear of foundation ditch 11, is provided with sump pit 12 in the foundation ditch 11, is provided with on the sump pit 12 to communicate to the water drainage tank or the drainage canal in the sedimentation tank to arrange the sewage in the foundation ditch 11 to the sedimentation tank. In one embodiment, the sump 12 and the settling pond are arranged on both sides of the earth-rock cofferdam 3.
In a specific embodiment, one side of the first cofferdam and the second cofferdam close to the interior of the sedimentation tank is a backwater side, and the other side of the first cofferdam and the second cofferdam is a water-facing side.
The primary sedimentation tank 1 is formed by enclosing an earth-rock cofferdam 3, a concrete cofferdam 4, a first cofferdam 5 and a sub-weir 6 and is used for settling first sewage discharged from a foundation pit 11. As shown in fig. 3, a clay core wall 9 is arranged in the first cofferdam 5 to prevent the wastewater from seeping out of the cofferdam, and the slope ratio of the two sides of the weir body is 1: 1. After the first cofferdam 5 is filled, a 50 cm-thick dry masonry protection slope 10 is built on the water-facing side of the first cofferdam 5, the first cofferdam 5 is further reinforced, and the first cofferdam 5 is prevented from being washed by water flow.
As shown in fig. 2, a sub-weir 7 is arranged between the primary sedimentation tank 1 and the secondary sedimentation tank 2, and the slope ratio of the two sides of the weir body of the sub-weir 7 is 1: 1. After the filling of the sub-weir 7 is completed, a layer of composite geotextile 8 is laid on the weir body at one side of the sub-weir close to the primary sedimentation tank 1. The wastewater is precipitated and filtered in the primary sedimentation tank 1 and then flows to the secondary sedimentation tank 2 through the sub weir body.
As shown in fig. 4, the secondary sedimentation tank 2 is formed by enclosing a concrete cofferdam 4, a sub-weir 7 and a second cofferdam 6, the slope ratio of two sides of the second cofferdam 6 is 1:1, and a 50 cm-thick dry masonry protection slope is built on the water facing side of the second cofferdam 6, so that the cofferdam is prevented from being washed by water flow, and the construction safety of the cofferdam is improved. After the second cofferdam 6 is filled, the composite geotextile 8 is laid on the back water side (the side close to the secondary sedimentation tank 2). The wastewater is precipitated and filtered in the secondary sedimentation tank 2 and is rapidly cleared and discharged through the weir body of the second cofferdam 6 after reaching the standard.
The composite geotextile 8 laid on the sub-weir 7 and the second cofferdam 6 has good hydrolysis resistance, can filter soil particles such as silt and small stone, has good air permeability and water permeability, and can quickly discharge filtered water.
The first cofferdam 5, the second cofferdam 6 and the sub-dams 7 are all filled with stone slag of excavation materials of the foundation pit, the materials are obtained locally, the building materials do not need to be transported from outside, the cost is low, and the construction is convenient.
The height and width of the first cofferdam 5, the sub-weir 7 and the second cofferdam 6 are changed during construction according to the condition and the water discharge of a site, so that the capacity of the first-stage sedimentation tank and the second-stage sedimentation tank is adjusted, and the construction in a foundation pit is not influenced according to local conditions. In some embodiments, the positions of the earth-rock cofferdam 3 and the concrete cofferdam 4 of the foundation pit can be changed, and the secondary sedimentation tank 2 can also be formed by enclosing the earth-rock cofferdam 3, the sub-weir 7 and the second cofferdam 6. The weir rear type sedimentation tank is not limited by the space of the site in the base, and the working efficiency can be effectively improved.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations can be made by the worker in the light of the above teachings without departing from the spirit of the utility model. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. A simple sedimentation tank suitable for large flow behind a weir is characterized in that a concrete cofferdam and an earth-rock cofferdam of a foundation pit are taken as the side edges of the sedimentation tank, and the rest cofferdams of the sedimentation tank are built to be enclosed with the concrete cofferdam and the earth-rock cofferdam to form the sedimentation tank; the sedimentation tank comprises a primary sedimentation tank and a secondary sedimentation tank, the primary sedimentation tank and the secondary sedimentation tank are connected through a sub weir, and waste water in the foundation pit is discharged after being precipitated through the primary sedimentation tank and the secondary sedimentation tank in sequence.
2. The simple sedimentation tank behind a weir suitable for high flow rate of claim 1, wherein a water collecting well is arranged in the foundation pit, and a drainage channel communicated to the sedimentation tank is arranged in the water collecting well.
3. The simple sedimentation tank behind a weir suitable for high flow rate of claim 1, wherein the primary sedimentation tank is enclosed by a concrete cofferdam, an earth-rock cofferdam, a first cofferdam and a sub-weir.
4. The simple sedimentation tank behind a weir suitable for high flow rate of claim 3, wherein the secondary sedimentation tank is enclosed by a concrete cofferdam, a sub-weir and a second cofferdam.
5. The simple sedimentation tank behind a weir suitable for high flow rate of claim 4, wherein the first cofferdam, the second cofferdam and the sub-weir are all filled with ballast of excavation material of a foundation pit.
6. The simple sedimentation tank behind a weir suitable for high flow rate of claim 5, wherein the first cofferdam is internally provided with a clay core wall, and the facing side of the first cofferdam is built with a 50cm thick dry masonry revetment.
7. The simple sedimentation tank behind a weir suitable for high flow rate of claim 5, wherein the facing side of the second cofferdam is built with a 50cm thick dry masonry revetment, and the backing side is laid with a layer of composite geotextile.
8. A simple sedimentation tank behind a weir suitable for high flow rate as claimed in claim 5, wherein a layer of composite geotextile is laid on the side of the sub-weir near the primary sedimentation tank.
9. A simple sedimentation tank behind a weir suitable for high flow rate as claimed in claim 4, wherein the slope ratio of the first cofferdam, the second cofferdam and the sub-weir is 1: 1.
10. A simple sedimentation tank behind a weir suitable for high flow rates as claimed in claim 2, wherein the water collection well and the sedimentation tank are arranged on both sides of the earth rock cofferdam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122259102.3U CN215841761U (en) | 2021-09-17 | 2021-09-17 | Simple sedimentation tank suitable for large flow behind weir |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122259102.3U CN215841761U (en) | 2021-09-17 | 2021-09-17 | Simple sedimentation tank suitable for large flow behind weir |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215841761U true CN215841761U (en) | 2022-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122259102.3U Active CN215841761U (en) | 2021-09-17 | 2021-09-17 | Simple sedimentation tank suitable for large flow behind weir |
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| Country | Link |
|---|---|
| CN (1) | CN215841761U (en) |
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2021
- 2021-09-17 CN CN202122259102.3U patent/CN215841761U/en active Active
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