Large open type floodway foundation drainage system

Abstract

A large open type floodway foundation drainage system comprises a bottom plate and a dam foundation, a longitudinal drainage pipe culvert and a transverse drainage pipe culvert which are of a #-shaped structure are arranged between the bottom plate and the dam foundation, holes are vertically punched in the foundation, drainage pipes are arranged in the holes, and the drainage pipes are communicated with the transverse drainage pipe culvert. Seepage water in a dam foundation enters the drainage pipes under the action of uplift pressure and is further discharged into drainage channels formed by the transverse drainage pipe culverts, seepage water in the transverse drainage pipe culverts converges into the longitudinal drainage pipe culverts, and due to the fact that the drainage pipe network is provided with a certain gradient, the seepage water is guided and discharged to the downstream and is discharged out of the structure. The device has the advantages of simple and practical structure, high drainage efficiency, low later maintenance cost, energy conservation, environmental protection and the like, and is suitable for drainage of large-size open type floodway foundations and slopes.

Description

Technical Field

[0001] The utility model belongs to the technical field of open spillway foundation and slope drainage, and in particular relates to a large open spillway foundation drainage system. Background Art

[0002] During the construction, an open spillway was set up on the left bank of the dam. The width of the spillway is 120m, the length of the axis is 400m, the top elevation of the spillway bottom plate inlet is 295m, and the bottom plate thickness changes from 3.5m at the inlet to 1.0m. The normal water storage level of the dam is 295m. Therefore, the foundation of the spillway is immersed in water for a long time. Due to the uplift pressure, the seepage will generate upward buoyancy. The seepage buoyancy in the foundation acts at 48,000m. 2 If the bottom plate is not covered with water, it will damage the bottom plate, affecting the service life of the bottom plate and the safety of the project. Therefore, the bottom plate must not only have sufficient thickness and strength, but also a drainage system must be set up inside the bottom plate to reduce the foundation uplift pressure and ensure smooth drainage. Summary of the invention

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the above-mentioned prior art and provide a large open spillway foundation drainage system with high drainage efficiency, convenient installation and low maintenance cost.

[0004] The technical solution adopted to solve the above technical problems is: a large open spillway foundation drainage system, including a bottom plate and a dam foundation, characterized in that a longitudinal drainage culvert and a transverse drainage culvert in a criss-cross structure are arranged between the bottom plate and the dam foundation, vertical holes are drilled in the dam foundation, drainage pipes are arranged in the holes, and the drainage pipes are connected to the transverse drainage culvert.

[0005] The longitudinal drainage pipe culvert of the utility model has a direction consistent with the longitudinal axis, and the transverse drainage pipe culvert is arranged obliquely to the longitudinal axis, with an included angle of 15 to 20 degrees.

[0006] A plurality of drainage holes are evenly distributed on the drainage pipe of the utility model.

[0007] The longitudinal drainage pipe culvert and the transverse drainage pipe culvert of the utility model are composed of a plurality of sections of semicircular prefabricated pipes connected end to end, and mortar is used to point the adjacent semicircular prefabricated pipes.

[0008] The thickness of the bottom plate of the utility model is greater than the thickness of the semicircular prefabricated pipe, and the semicircular prefabricated pipe needs to be avoided when the steel bars are poured in the bottom plate.

[0009] The drainage pipe network formed by the longitudinal drainage pipe culvert and the transverse drainage pipe culvert of the utility model forms a set slope from upstream to downstream to drain the seepage water outside the structure.

[0010] The semicircular prefabricated pipeline of the utility model is opened downward.

[0011] Since the utility model adopts a drainage network arranged between the bottom plate and the dam foundation according to the upstream and downstream slopes, the drainage network is connected by a longitudinal drainage culvert arranged along the longitudinal axis and a transverse drainage culvert obliquely intersecting the longitudinal axis to form a tic-tac-toe structure, the transverse drainage culvert is connected with a drainage pipe arranged in the dam foundation, the seepage water in the dam foundation enters the drainage pipe under the action of uplift pressure, and is further discharged into the drainage channel formed by the transverse drainage culvert, the seepage water in the transverse drainage culvert is merged into the longitudinal drainage culvert, and since the drainage network is arranged with a certain slope, the seepage water is led and discharged to the downstream, and thus discharged out of the structure, the longitudinal drainage culvert and the transverse drainage culvert in the device are formed by connecting a number of sections of semicircular prefabricated pipes end to end, the semicircular prefabricated pipes are installed and tested on-site, and mortar is used to point the adjacent pipes, which has the advantages of simple and practical structure, high drainage efficiency, low later maintenance cost, energy saving and environmental protection, etc., and is suitable for large-volume open spillway foundation and slope drainage. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0013] Figure 2 yes Figure 1 A partial schematic diagram of .

[0014] In the figure: 1. Longitudinal drainage culvert; 2. Horizontal drainage culvert; 3. Drainage pipe; 4. Bottom plate; 5. Dam foundation. DETAILED DESCRIPTION

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to these embodiments.

[0016] Example 1

[0017] exist Figure 1 , 2In the present invention, a large open flood discharge channel foundation drainage system is provided, comprising a bottom plate 4 and a dam foundation 5, a longitudinal drainage culvert 1 and a transverse drainage culvert 2 in a well-shaped structure are installed between the bottom plate 4 and the dam foundation 5, a vertical hole is drilled in the dam foundation 5, a drainage pipe 3 is arranged in the hole, the drainage pipe 3 is connected with the transverse drainage culvert 2, and a plurality of drainage holes are evenly arranged on the drainage pipe 3, and the drainage holes are used for the seepage water to enter the drainage pipe 3 under the uplift pressure in the dam foundation 5, and then enter the drainage network formed by the longitudinal drainage culvert 1 and the transverse drainage culvert 2. Since the drainage network forms a set slope from upstream to downstream, the seepage water can be drained to the downstream and further discharged outside the structure. Further, the direction of the longitudinal drainage culvert 1 of this embodiment is consistent with the longitudinal axis, and the transverse drainage culvert 2 is obliquely arranged with the longitudinal axis, with an angle of 15 to 20 degrees. The longitudinal drainage culvert 1 and the transverse drainage culvert 2 are composed of a plurality of groups of semicircular prefabricated pipes connected end to end, and mortar is used to point the adjacent semicircular prefabricated pipes. In order to ensure the installation of the semicircular prefabricated pipe, the thickness of the bottom plate 4 is greater than that of the semicircular prefabricated pipe, and the semicircular prefabricated pipe needs to be avoided when the steel bars are poured in the bottom plate 4. The opening of the semicircular prefabricated pipe is set downward, which, on the one hand, forms a drainage channel with the dam foundation 5 to drain the seepage water, and on the other hand, blocks the seepage water and prevents the seepage water from entering the bottom plate 4.

Claims

1. A large open spillway foundation drainage system, comprising a bottom plate (4) and a dam foundation (5), characterized in that: A longitudinal drainage culvert (1) and a transverse drainage culvert (2) in a crisscross structure are arranged between a bottom plate (4) and a dam foundation (5); vertical holes are drilled in the dam foundation (5); drainage pipes (3) are arranged in the holes; and the drainage pipes (3) are connected to the transverse drainage culvert (2).

2. A large open spillway foundation drainage system according to claim 1, characterized in that: The longitudinal drainage culvert (1) has a direction consistent with the longitudinal axis, and the transverse drainage culvert (2) is arranged obliquely to the longitudinal axis, with an included angle of 15 to 20 degrees.

3. A large open spillway foundation drainage system according to claim 1, characterized in that: The drainage pipe (3) is evenly provided with a plurality of drainage holes.

4. A large open spillway foundation drainage system according to claim 1, characterized in that: The longitudinal drainage culvert (1) and the transverse drainage culvert (2) are composed of a plurality of sections of semicircular prefabricated pipes connected end to end, and mortar is used to point the adjacent semicircular prefabricated pipes.

5. A large open spillway foundation drainage system according to claim 4, characterized in that: The thickness of the bottom plate (4) is greater than the thickness of the semicircular prefabricated pipe, and the semicircular prefabricated pipe needs to be avoided when arranging the cast steel bars in the bottom plate (4).

6. A large open spillway foundation drainage system according to claim 1, characterized in that: The drainage network formed by the longitudinal drainage culvert (1) and the transverse drainage culvert (2) forms a set slope from upstream to downstream to drain the seepage water outside the structure.

7. A large open spillway foundation drainage system according to claim 4, characterized in that: The semicircular prefabricated pipe opening is arranged downward.

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