Water retaining dam for drainage in alpine and gorge region construction period

Abstract

The utility model belongs to the technical field of water conservancy, and relates to a water retaining dam for drainage in a high mountain and valley region during a construction period, which comprises a rolling type earth and stone water retaining dam body and a construction period drainage system, the rolling type earth and rock retaining dam body comprises a dam foundation arranged above a covering layer of a riverbed, a rock ballast piled dam body arranged on the upstream of the dam foundation and a rock block filling drainage dam body arranged on the downstream of the dam foundation. The rock ballast piled dam body makes contact with one side of the rock block filling drainage dam body, and the rock ballast piled dam body is arranged above the rock block filling drainage dam body. The construction period drainage system comprises drainage culvert pipes arranged along the dam foundation. According to the utility model, the retaining dam has a water retaining condition, so that the construction period of the whole ditch water treatment is effectively shortened, the safety of a flood season is improved, and the overall safety and stability of the dam body of the rolling type earth-rock retaining dam can be ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of water conservancy, and in particular relates to a water retaining dam used for drainage during construction in a high mountain canyon area. Background Art

[0002] At present, in water conservancy and hydropower projects in mountainous canyon areas, the available construction sites are almost all located in gullies. In areas with heavy rainfall during the flood season every year, temporary facilities, slag yards and camps arranged in gullies face huge safety pressure during the flood season. Therefore, it is often necessary to treat the gullies and make effective use of them. The gully water treatment project is generally completed by the coordinated work of two hydraulic structures, a dam and a drainage hole, to provide a safe and usable site for the gully downstream of the dam during the flood season. Generally, there is a large amount of constant flowing water in the gully. The dam often needs to create dry land construction conditions after the drainage hole flows through before it can be built, and the dam foundation needs to be vertically or horizontally anti-seepage treated to reduce the seepage volume of the dam body. The entire process is complicated and the construction period is long. The body of an earth-rock dam cannot overflow, and construction diversion can only be carried out by building a temporary cofferdam upstream to divert water to the drainage hole for overflow. As a result, the construction of the dam often needs to be carried out after the drainage hole has the conditions for overflow. If the drainage hole has the conditions for overflow, the construction period will be delayed, which will directly affect the construction of the dam. For example, the ditch water treatment project cannot be completed before the flood season, the temporary facilities already arranged in the gully will face tremendous pressure to safely pass the flood season. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a water retaining dam for drainage during construction period in high mountain canyon areas, including a rolled earth-rock retaining dam body and a drainage system during construction period;

[0004] The body of the rolled earth-rock retaining dam includes a dam foundation arranged above the covering layer of the riverbed, a slag pile dam body arranged upstream of the dam foundation, and a block rock filling drainage dam body arranged downstream of the dam foundation; the slag pile dam body is in contact with one side of the block rock filling drainage dam body, and the slag pile dam body is arranged above the block rock filling drainage dam body;

[0005] The drainage system during the construction period includes drainage culverts set along the dam foundation.

[0006] On the basis of the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, a dry block stone layer, a first cushion material, a composite geomembrane and a second cushion material are sequentially arranged from outside to inside on the upstream side of the slag dam body.

[0008] Furthermore, the drainage culvert is a steel corrugated pipe or a reinforced concrete culvert.

[0009] Furthermore, a pipe perimeter cushion material is arranged around the drainage culvert.

[0010] Furthermore, reinforced gabions are laid under the outlet of the drainage culvert.

[0011] Furthermore, the inlet of the drainage culvert is provided with an upstream plugging port, and the outlet of the drainage culvert is provided with a downstream plugging port.

[0012] Furthermore, the composite geomembrane is an anti-leakage layer.

[0013] The beneficial effects of the utility model are:

[0014] The retaining dam includes a rolled earth-rock retaining dam body and a construction period drainage system, which works in conjunction with the drainage holes of hydraulic structures and temporary cofferdams to treat ditch water in water conservancy and hydropower projects; the drainage holes of hydraulic structures are used to drain ditch water. Since the construction period drainage system can drain ditch water during the construction period, the retaining dam can be constructed in advance without waiting for the drainage holes of the hydraulic structures to meet the flow conditions. When the rolled earth-rock retaining dam body is completed and has the water retaining conditions, and the drainage holes of the hydraulic structures have the flow conditions, a temporary cofferdam can be built to raise the ditch water to the drainage holes of the hydraulic structures for drainage, thereby blocking the construction period drainage system and allowing the retaining dam to meet the water retaining conditions, thereby effectively shortening the entire ditch water treatment period and improving flood season safety.

[0015] The dam foundation does not need to be treated horizontally or vertically for anti-seepage. The optimization of anti-seepage can effectively reduce investment and save construction time, but it will also cause some water to seep along the dam foundation. The block stone drainage dam body located on the downstream base side has high permeability and can effectively discharge the seepage water from the dam foundation, ensuring the overall safety and stability of the dam body of the rolled earth-rock retaining dam. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an overall schematic diagram of a water retaining dam provided by the utility model for drainage during construction in mountainous canyon areas;

[0017] Figure 2 In the embodiment of the utility model Figure 1 Cross-sectional view along the A-A' direction;

[0018] Figure 3 It is a cross-sectional schematic diagram of the drainage culvert arrangement in the embodiment of the utility model;

[0019] Figure 4 It is a schematic diagram of the upstream and downstream blocking of the drainage system during the construction period in an embodiment of the utility model.

[0020] Icons: 1-body of rolled earth-rock retaining dam; 2-drainage system during construction; 21-drainage culvert; 22-cushion material around the pipe; 23-reinforced gabion; 24-upstream sealing port; 2401-upstream sealing area; 25-downstream sealing port; 2501-downstream sealing area; 3-drainage hole of hydraulic structure; 4-temporary cofferdam; 11-dam foundation; 12-slag pile dam body; 13-block stone filling drainage dam body; 1201-dry block stone layer; 1202-first cushion material; 1203-composite geomembrane; 1204-second cushion material. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] As an example, Figure 1 As shown, in order to solve the above technical problems, this embodiment provides a water retaining dam for drainage during construction period in mountainous canyon areas, including a rolled earth-rock retaining dam body 1 and a drainage system 2 during construction period;

[0023] like Figure 2 shown Figure 1 In the cross-sectional view along the A-A' direction, the dam body 1 of the rolled earth-rock retaining dam comprises a dam foundation 11 arranged above the covering layer of the riverbed, a slag dam body 12 arranged upstream of the dam foundation, and a block-rock-filled drainage dam body 13 arranged downstream of the dam foundation; the slag dam body 12 is in contact with one side of the block-rock-filled drainage dam body 13, and the slag dam body 12 is arranged above the block-rock-filled drainage dam body 13;

[0024] In actual application, Figure 2 As shown, the dam body 2 of the rolled earth-rock retaining dam needs to be cleaned of the original river channel and the ground covering layer before construction as the dam foundation 11. Generally, 1 to 2 m of the original river channel and the ground covering layer are cleaned as the dam foundation 11, and the dam bodies above the dam foundation 11 are the slag pile dam body 12 and the block stone filling drainage dam body 13 in sequence. The dam foundation 11 does not need to be treated with horizontal or vertical anti-seepage treatment. The optimization of anti-seepage can effectively reduce investment and save construction time, but it will also cause part of the water flow to seep along the dam foundation 11. The block stone filling drainage dam body 13 located on the downstream base side has high permeability and can well discharge the seepage water of the dam foundation 11, ensuring the overall safety and stability of the dam body 2 of the rolled earth-rock retaining dam.

[0025] The construction period drainage system 2 includes a drainage culvert 21 arranged along the dam foundation.

[0026] In actual application, Figure 1 As shown, the water retaining dam includes a rolled earth-rock retaining dam body 1 and a construction period drainage system 2, which work in conjunction with a hydraulic structure drainage hole 3 and a temporary cofferdam 4, and are used for ditch water treatment in water conservancy and hydropower projects. The hydraulic structure drainage hole 3 is used for ditch water drainage. Since the construction period drainage system 2 can drain the ditch water during the construction period, the water retaining dam can be constructed in advance without waiting for the hydraulic structure drainage hole 3 to meet the flow conditions. When the rolled earth-rock retaining dam body 1 is completed and has the water retaining conditions, and when the hydraulic structure drainage hole 3 has the flow conditions, a temporary cofferdam 4 can be built to raise the ditch water to the hydraulic structure drainage hole 3 for drainage, thereby blocking the construction period drainage system 2 so that the water retaining dam has the water retaining conditions, thereby effectively shortening the entire ditch water treatment period and improving flood season safety.

[0027] Optional, such as Figure 2 As shown, the upstream side of the slag dam body 12 is provided with a dry block stone layer 1201, a first cushion material 1202, a composite geomembrane 1203 and a second cushion material 1204 in sequence from the outside to the inside.

[0028] In actual application, the upstream side of the slag dam body 12 is the water-facing surface of the dam, and arranged from outside to inside are dry block stones 1201, the first cushion material 1202, the composite geomembrane 1203, and the second cushion material 1204. The cushion materials are arranged on the upper and lower layers of the composite geomembrane 1203, respectively. The cushion materials can well protect the composite geomembrane 1203 to prevent it from being scratched by the slag dam body 12, thereby extending the durability and improving the impermeability. The dry block stones 1201 are used to fix the water-facing surface and weaken the impact of waves and floods, thereby extending the service life of the dam.

[0029] Optionally, the drainage culvert 21 is a steel corrugated pipe or a reinforced concrete culvert.

[0030] In actual application, the drainage culvert 21 can be an assembled steel corrugated pipe or a cast-in-place reinforced concrete culvert, and the pipe diameter is generally determined according to the flow rate to be drained.

[0031] Optionally, a pipe perimeter cushion material 22 is arranged around the drainage culvert.

[0032] In actual application, Figure 3 As shown, a pipe surrounding cushion material 22 is arranged around the drainage culvert 21, and the drainage culvert 21 is arranged above the dam foundation 11, which can effectively avoid damage to the drainage culvert 21 when the dam body 12 is built with slag and the drainage dam body is built with blocks.

[0033] Optionally, a reinforced gabion 23 is laid below the outlet of the drainage culvert 21 .

[0034] In actual application, a reinforced gabion 23 is arranged at the downstream outlet of the drainage culvert 21 to prevent the high flow velocity at the outlet from scouring the original riverbed.

[0035] Optionally, the inlet of the drainage culvert 21 is provided with an upstream blocking port 24 , and the outlet of the drainage culvert 21 is provided with a downstream blocking port 25 .

[0036] In actual application, Figure 1 As shown in the figure, when the construction of the rolled earth-rock retaining dam body 2 is completed and the drainage hole 1 of the hydraulic structure is ready for flow, the construction period drainage system 3 can be permanently blocked. When blocking, first build a temporary cofferdam 4 to raise the ditch water to the drainage hole 1 of the hydraulic structure for drainage. When there is no water flow in the inlet and outlet of the drainage culvert 21, as shown in the figure, the drainage system 3 is permanently blocked during the construction period. Figure 4 As shown, the upstream plugging port 24 of the drainage culvert 21 can be plugged to form an upstream plugging area 2401, and the downstream plugging port 25 of the drainage culvert 21 can be plugged to form a downstream plugging area 2501. The plugging is generally cast with concrete, and the length of the upstream plugging area is generally much larger than the downstream plugging area, so as to better prevent water infiltration at the inlet. When the drainage system 3 is plugged during the construction period, the temporary cofferdam 4 can be excavated, and the rolled earth-rock retaining dam body can be used to retain water until the ditch water treatment project is completed.

[0037] Optionally, the composite geomembrane 1203 is an anti-leakage layer.

[0038] In actual application, composite geomembrane 1203 is an anti-leakage layer, which can effectively prevent leakage of the dam body.

[0039] The utility model eliminates vertical seepage prevention of the foundation of the retaining dam, such as anti-seepage walls, grouting curtains, etc., or horizontal seepage prevention such as anti-seepage blankets, and further optimizes the bottom anti-leakage layer and the inner liner anti-leakage structure, which is simpler in structure and easier to construct. Since the most recent technical anti-seepage methods all use geomembranes, and there is no vertical and horizontal anti-seepage of the dam foundation, this will result in some water always seeping in the dam body, and the dam body is also an earth-rock dam structure built with slag materials. Long-term seepage water may cause the dam body to be damaged and deformed. In view of the seepage water of the dam foundation, the utility model arranges a drainage dam body with high permeability blocks on the downstream base side, so that the seepage water of the dam foundation and the slag dam body can be better discharged without damaging the dam body, which can better ensure the safety and stability of the retaining dam.

[0040] The utility model adopts a type of water retaining dam that combines a construction period drainage system 3 with a rolled earth-rock water retaining dam body 2. The construction period drainage system 3 is a part of the water retaining dam structure and can drain the normal flow water in the gully before the construction of the rolled earth-rock water retaining dam body 2, so that the construction of the water retaining dam can be carried out in advance before the drainage hole 1 of the hydraulic structure has the flow condition, which can effectively shorten the construction period of the entire ditch water treatment project.

[0041] The utility model develops a new water retaining dam structure by utilizing the construction period drainage system 3 in combination with the elimination of traditional anti-seepage measures. Compared with the existing technology, this water retaining dam saves investment, reduces the overall construction period, and is more conducive to the advancement of preliminary water conservancy and hydropower projects in the mountainous and canyon areas of the southwest.

[0042] The dam foundation does not need to be treated horizontally or vertically for anti-seepage. The dam body type composed of a slag dam body 12 and a block-stone drainage dam body 13 on the top can effectively discharge the seepage water from the dam foundation. The combined structure of the construction period drainage system 3 and the rolled earth-rock retaining dam body 2 can enable the retaining dam to be constructed in advance, shortening the construction period of the entire ditch water treatment project.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A water retaining dam used for drainage during construction in mountainous canyon areas, characterized in that: It comprises a rolled earth-rock retaining dam body (1) and a drainage system (2) during construction; The body (1) of a rolled earth-rock retaining dam comprises a dam foundation (11) arranged above a covering layer of a riverbed, a slag pile dam body (12) arranged upstream of the dam foundation (11), and a block-rock-filled drainage dam body (13) arranged downstream of the dam foundation (11); the slag pile dam body (12) contacts one side of the block-rock-filled drainage dam body (13), and the slag pile dam body (12) is arranged above the block-rock-filled drainage dam body (13); The construction-period drainage system (2) comprises a drainage culvert (21) arranged along the dam foundation (11).

2. A water retaining dam for drainage during construction period in alpine canyon areas according to claim 1, characterized in that: On the upstream side of the slag dam body (12), a dry block stone layer (1201), a first cushion material (1202), a composite geomembrane (1203) and a second cushion material (1204) are arranged in sequence from the outside to the inside.

3. A water retaining dam for drainage during construction period in alpine canyon areas according to claim 1, characterized in that: The drainage culvert (21) is a steel corrugated pipe or a reinforced concrete culvert.

4. A water retaining dam for drainage during construction period in alpine canyon areas according to claim 1, characterized in that: A pipe surrounding cushion material (22) is arranged around the drainage culvert (21).

5. A water retaining dam for drainage during construction period in high mountain valley areas according to claim 1, characterized in that: A reinforced gabion (23) is laid below the outlet of the drainage culvert (21).

6. A water retaining dam for drainage during construction period in high mountain valley areas according to claim 1, characterized in that: The inlet of the drainage culvert (21) is provided with an upstream plugging port (24), and the outlet of the drainage culvert (21) is provided with a downstream plugging port (25).

7. A water retaining dam for drainage during construction period in high mountain valley areas according to claim 1, characterized in that: The composite geomembrane (1203) is an anti-leakage layer.

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