Drainage structure combining water drainage tank culvert and drainage tunnel behind dam

Abstract

The utility model provides a drainage structure combining a dam back drainage tank culvert and a drainage tunnel, a construction drainage tunnel is arranged behind a dam with a dam back pressure slope body, the construction drainage tunnel is arranged in a bank slope mountain, and a river channel at the downstream of an inlet of the construction drainage tunnel is provided with a closure cofferdam; the dam foot of the dam is provided with a water collecting retaining wall connected with mountains on the two sides, the downstream of the water collecting retaining wall is closely connected with a drainage box culvert, the two ends of the drainage box culvert are communicated with a gallery in the water collecting retaining wall and a construction drainage hole respectively, and drainage steel pipes for guiding seepage water of the dam body to be drained are arranged in the drainage box culvert and the construction drainage hole in a back-loading mode. The construction drainage tunnel is arranged in a permanent and temporary combined mode, so that temporary diversion operation is conducted before the lower reservoir diversion tunnel construction is completed and overflowing is completed, and it is guaranteed that earlier-stage slag accumulation of a pressure slope body behind a dam is not affected in the construction period; and a drainage tunnel is constructed in the operation period and also serves as a drainage channel for water seepage of the rear half dam body of the dam drainage box culvert.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete panel rockfill dam engineering, in particular to a drainage structure combining a drainage box culvert and a drainage hole behind a dam. Background Art

[0002] Current policies prohibit the construction of buildings and structures that hinder flood flow, and the dumping and abandonment of debris within the scope of river and sea management. The waste residues of many pumped-storage power station projects can only be discarded behind the dam as the slope pressure behind the dam. After the project starts, the waste residues from each working face in the early stage of the project face the time and space problem of waste residue disposal before the completion of the reservoir diversion tunnel.

[0003] Moreover, the catchment area of ​​the reservoir below the pumped storage power station is generally large, and the simple drainage method cannot meet the requirements of temporary diversion. At the same time, for concrete panel rockfill dams, there are also requirements for dam foundation drainage channels and leakage monitoring during operation. At present, the dam foundation drainage of concrete panel rockfill dams with pressure slope bodies mainly adopts the structure of setting drainage belts and drainage culverts at the bottom of the pressure slope body.

[0004] In view of this, it is particularly important to develop and design a permanent and temporary combined drainage structure that can not only solve the problem of waste slag in the early stage of the project, but also be used as a seepage drainage channel for the dam during operation. Utility Model Content

[0005] The purpose of the utility model is to provide a drainage structure that can ensure the discharge of waste slag and seepage water in the early stage of the project and during the operation of the dam. To this end, the utility model adopts the following technical solutions:

[0006] A drainage structure combining a drainage box culvert and a drainage hole behind a dam, wherein a construction drainage hole is arranged behind a dam with a pressure slope behind the dam, the construction drainage hole is arranged in the mountain body of the bank slope, and a diversion cofferdam is arranged in the river channel downstream of the inlet of the construction drainage hole; a water collecting retaining wall connected to the mountains on both sides is arranged at the foot of the dam, a drainage box culvert is arranged immediately downstream of the water collecting retaining wall, and both ends of the drainage box culvert are respectively connected to the corridor inside the water collecting retaining wall and the construction drainage hole, and drainage steel pipes for guiding the discharge of seepage water from the dam body are rear-mounted in the drainage box culvert and the construction drainage hole, the water inlet of the drainage steel pipe passes through the water collecting retaining wall and extends into the corridor, and the water outlet is arranged at the outlet of the construction drainage hole, so that the construction drainage hole can be converted from a one-way temporary diversion operation to a dam seepage guided discharge after the dam is stored and operated.

[0007] Furthermore: a grouting curtain is arranged at the bottom of the water collection retaining wall.

[0008] Furthermore: drainage blocks are arranged upstream of the water-collecting retaining wall, so as to form a water-collecting area upstream of the water-collecting retaining wall.

[0009] Furthermore: the water-collecting retaining wall is provided with a first drainage pipe connected with the corridor on the upstream side of the wall.

[0010] Furthermore: the drainage culvert is provided with a water-stop structure in its wall body; a second drainage pipe is provided on the side wall of the drainage culvert, and a water-passing structure is provided at the end of the second drainage pipe relative to the side of the pressure slope body behind the dam, and the pressure slope body behind the dam and the internal cavity of the drainage culvert are connected through the second drainage pipe to lead the seepage water in the pressure slope body behind the dam to the drainage ditch in the internal cavity of the drainage culvert.

[0011] Furthermore: a graded gravel layer, a transition layer and a filter layer are sequentially arranged on the top of the drainage box culvert.

[0012] Furthermore: a plurality of anchor blocks are arranged at intervals on the installation path of the drainage steel pipe.

[0013] Furthermore: the construction drainage hole is provided with a vent hole directly connected to the ground during the operation period of the dam.

[0014] Furthermore: a water measuring weir is arranged at the outlet of the construction drainage hole, and the water measuring weir is connected to the drainage steel pipe.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The construction drainage hole of the utility model is arranged in a permanent and temporary combination, so that it can perform temporary diversion operations before the construction of the diversion hole of the lower reservoir is completed. During the construction period, a diversion cofferdam is set in the river channel downstream of the entrance of the construction drainage hole, which is used as a temporary diversion hole to drain the river water to the downstream of the pressure slope behind the dam, ensuring that the early slag pile of the pressure slope behind the dam during the construction period is not affected; and during the operation period, the construction drainage hole also serves as a drainage channel for water seepage in the rear half of the dam drainage box culvert. Therefore, the utility model can not only solve the problem of early stage waste slag, but also be used as a permanent and temporary combined drainage structure for the seepage drainage channel of the dam during the operation period, so as to realize the temporary construction diversion function, the early stage of the project behind the pressure slope body waste slag filling function, the dam seepage collection and measurement function during the operation period, and the maintenance function of the dam foundation drainage system during the operation period. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a plan layout diagram of the overall structure of the utility model;

[0018] Figure 2 It is a longitudinal section view of the overall structure of the utility model along the drainage box culvert and the construction drainage hole;

[0019] Figure 3 It is a schematic diagram of the upstream and downstream structures of the water collection retaining wall of the utility model;

[0020] Figure 4 It is a cross-sectional view of the utility model along the axis of the water collection retaining wall;

[0021] Figure 5 It is a cross-sectional view of the drainage box culvert of the present utility model.

[0022] The markings in the attached figure are: 1-pressure slope behind the dam; 2-dam; 3-water collection retaining wall; 4-drainage stone; 5-drainage box culvert; 6-construction drainage hole; 7-interception cofferdam; 8-drainage steel pipe; 9-vent; 10-water measuring weir; 11-grouting curtain; 12-grouting and drainage corridor; 13-first drainage pipe; 14-structural joint; 15-waterstop copper sheet; 16-anchor pier; 17-second drainage pipe; 18-graded gravel layer; 19-transition layer; 20-filter layer; 21-lower reservoir diversion hole; 22-bank slope mountain. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0024] like Figure 1-5 As shown, a drainage structure combining a drainage box culvert and a drainage hole behind a dam is shown. The drainage structure is suitable for the foundation drainage of a concrete panel rockfill dam with a pressure slope body 1 behind the dam. A construction drainage hole 6 is set behind the dam 2. The construction drainage hole 6 is arranged in the bank slope mountain body 22. A interception cofferdam 7 is set at the downstream river channel of the inlet of the construction drainage hole 6 during the construction period. When the construction drainage hole 6 performs temporary diversion operations, the river water is discharged to the downstream through the construction drainage hole 6. At the same time, after the downstream of the interception cofferdam 7 forms dry land conditions, the downstream pressure slope body 1 behind the dam is filled; a water collection retaining wall 3 is set at the foot of the dam 2 to make the water collection retaining wall The wall 3 is connected to the mountains on both sides of the dam 2 in a direction parallel to the dam axis at the foot of the dam 2 to form a retaining wall. A drainage culvert 5 is set immediately downstream of the water-collecting retaining wall 3. The two ends of the drainage culvert 5 are respectively connected to the corridor 12 and the construction drainage hole 6 inside the water-collecting retaining wall 3. The drainage culvert 5 and the construction drainage hole 6 are rear-mounted with drainage steel pipes 8 for guiding the discharge of seepage water from the dam body. The water inlet of the drainage steel pipe 8 passes through the water-collecting retaining wall 3 and extends into the corridor 12, and the water outlet is set at the exit of the construction drainage hole 6, so that the construction drainage hole 6 can be converted from a one-way temporary diversion operation to a dam seepage guided discharge after the dam 2 is stored and operated.

[0025] like Figure 1-4 As shown, drainage blocks 4 are arranged upstream of the water-collecting retaining wall 3, so as to form a water-collecting area upstream of the water-collecting retaining wall 3. In addition, a grouting curtain 11 is arranged at the bottom of the water-collecting retaining wall 3 where it is connected to the mountains on both sides, forming an anti-seepage system for dam body water seepage, and collecting the dam body water seepage in the water-collecting area formed by the drainage blocks 4.

[0026] like Figure 3As shown, the water collection retaining wall 3 is provided with a first drainage pipe 13 connected to the corridor 12 on the upstream side of the wall. The corridor 12 is a corridor with both grouting construction and drainage functions. The dam seepage water in the water collection area of ​​the drainage block 4 is led into the corridor 12 through the first drainage pipe 13 so as to be discharged through the drainage steel pipe 8.

[0027] like Figure 3-4 As shown, the drainage box culvert 5 is arranged at the bottom of the pressure slope body 1 behind the dam, and the water box culvert 5 is provided with a water-stopping structure in its wall body, and the water-stopping structure includes a structural seam 14 and a water-stopping copper sheet 15 arranged in the structural seam 14.

[0028] In this embodiment, the drainage box culvert 5 is provided with a structural joint 14 every approximately 15 m.

[0029] like Figure 5 As shown, a second drainage pipe 17 is arranged on the side wall of the drainage culvert 5, and a water-passing structure is arranged at the end of the second drainage pipe 17 on the side of the dam rear pressure slope body 1. The water-passing structure is preferably wrapped with geotextile at the end of the second drainage pipe 17, and the dam rear pressure slope body 1 and the internal cavity of the drainage culvert 5 are connected through the second drainage pipe 17 to lead the seepage water in the dam rear pressure slope body 1 to the drainage ditch in the internal cavity of the drainage culvert 5.

[0030] like Figure 5 As shown, a graded gravel layer 18, a transition layer 19 and a filter layer 20 are sequentially arranged on the top of the drainage box culvert 5.

[0031] like Figure 5 As shown, a plurality of anchor blocks 16 are arranged at intervals along the installation path of the drainage steel pipe 8. In this embodiment, an anchor block 16 is arranged every 15 m on the drainage steel pipe 8.

[0032] like Figure 2 As shown, the construction drainage hole 6 is provided with a vent hole 9 directly connected to the ground during the operation period of the dam 2.

[0033] like Figure 2 As shown, a water measuring weir 10 is arranged at the outlet of the construction drainage hole 6, and the water measuring weir 10 is connected to the drainage steel pipe 8.

[0034] See also Figure 1-5 When constructing through this drainage structure, the specific steps are as follows:

[0035] S1: Excavation and support of the construction drainage hole 6 are carried out according to the topographic and geological conditions of the bank slope mountain 22; after the construction drainage hole 6 is completed and has diversion conditions, a diversion cofferdam 7 is constructed at the downstream river channel of its inlet, and after the diversion cofferdam 7 forms dry land conditions downstream, the downstream back-dam pressure slope 1 is filled, and diversion is carried out through the construction drainage hole 6 during the process;

[0036] S2: During the dry season, the foundation trench of the drainage box culvert 5 and the construction of the box culvert structure are carried out by adopting the method of enclosure and pumping;

[0037] S3: Construction of the lower reservoir diversion tunnel 21 of the dam 2 is carried out. After the lower reservoir diversion tunnel 21 is completed and the flow is flowing, the diversion operation of the drainage tunnel 6 is stopped;

[0038] S4: constructing the water collection retaining wall 3 and the drainage block 4 at the foot of the dam 2 in sequence;

[0039] S5: Construction of the drainage box culvert 5 and the drainage steel pipe 8 in the drainage hole 6;

[0040] S6: constructing a vent hole 9 directly connected to the ground on the drainage hole 6, and constructing a water measuring weir 10 at its outlet.

[0041] The above embodiment is only a preferred technical solution of the present invention. Those skilled in the art should understand that the technical solutions or parameters in the embodiments can be modified or replaced without departing from the principle and essence of the present invention, and all should be included in the protection scope of the present invention.

Claims

1. A drainage structure combining a drainage box culvert and a drainage hole behind a dam, characterized in that: A construction drainage hole (6) is arranged behind a dam (2) having a rear-dam pressure slope body (1), wherein the construction drainage hole (6) is arranged in a bank slope mountain body (22), and a dam cofferdam (7) is arranged in a river channel downstream of the inlet of the construction drainage hole (6); A water-collecting retaining wall (3) connected to the mountains on both sides is arranged at the foot of the dam (2); a drainage culvert (5) is arranged immediately downstream of the water-collecting retaining wall (3); two ends of the drainage culvert (5) are respectively connected to a corridor (12) and a construction drainage hole (6) inside the water-collecting retaining wall (3); a drainage steel pipe (8) for guiding the drainage of dam body seepage is installed in the drainage culvert (5) and the construction drainage hole (6); the water inlet of the drainage steel pipe (8) passes through the water-collecting retaining wall (3) and extends into the corridor (12); and the water outlet is arranged at the outlet of the construction drainage hole (6).

2. The drainage structure combining a dam drainage box culvert and a drainage hole according to claim 1, characterized in that: A grouting curtain (11) is provided at the bottom of the water collection retaining wall (3).

3. A drainage structure combining a dam back drainage box culvert and a drainage hole according to claim 1 or 2, characterized in that: Drainage blocks (4) are arranged upstream of the water collection retaining wall (3), thereby forming a water collection area upstream of the water collection retaining wall (3).

4. The drainage structure combining a dam back drainage box culvert and a drainage hole according to claim 3, characterized in that: The water collection retaining wall (3) is provided with a first drainage pipe (13) on the upstream side of the wall and is connected to the corridor (12).

5. The drainage structure combining a dam back drainage box culvert and a drainage hole according to claim 1, characterized in that: The drainage culvert (5) is provided with a water-stop structure in its wall body; a second drainage pipe (17) is provided on the side wall of the drainage culvert (5); a water-passing structure is provided at the end of the second drainage pipe (17) on the side of the dam rear pressure slope body (1); the dam rear pressure slope body (1) and the internal cavity of the drainage culvert (5) are connected through the second drainage pipe (17) to guide the seepage water in the dam rear pressure slope body (1) to the drainage ditch in the internal cavity of the drainage culvert (5).

6. A drainage structure combining a dam back drainage box culvert and a drainage hole according to claim 1 or 5, characterized in that: The top of the drainage box culvert (5) is provided with a graded crushed stone layer (18), a transition layer (19) and a filter layer (20) in sequence.

7. The drainage structure combining a dam drainage box culvert and a drainage hole according to claim 1, characterized in that: The drainage steel pipe (8) is provided with a plurality of anchor blocks (16) at intervals on its installation path.

8. The drainage structure combining a dam-back drainage box culvert and a drainage hole according to claim 1, characterized in that: The construction drainage hole (6) is provided with a vent hole (9) directly connected to the ground during the operation period of the dam (2).

9. The drainage structure combining a dam-back drainage box culvert and a drainage hole according to claim 1, characterized in that: The construction drainage hole (6) is provided with a water measuring weir (10) at its outlet, and the water measuring weir (10) is connected to the drainage steel pipe (8).

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