Reverse drainage pipe plugging structure of face rockfill dam

Abstract

The utility model discloses a face plate rockfill dam reverse drainage pipe plugging structure, including the toe board of dam front laying mat bottom, toe board one side is connected with the lower side of face plate, and the face plate rockfill dam bottom is equipped with the pre -buried steel pipe, and the pre -buried steel pipe one end passes through the toe board and is led to the water collecting pit in the toe board upstream, a plurality of round pipe culverts are set up in the section on the water collecting pit, the utility model discloses a round pipe culvert is set up in the dam front laying mat, and the drainage passage is reserved, and the dam water can be discharged in the laying mat filling process.

Description

Technical Field

[0001] This utility model relates to the field of water conservancy and hydropower facilities technology, and in particular to a reverse drainage pipe sealing structure for a panel rockfill dam. Background Technology

[0002] During the construction of rockfill dam panels, to prevent the reverse water pressure inside the dam from pushing the panels upstream and causing displacement, it is generally necessary to install reverse drainage pipes inside the dam to lower the water level. While many inventions have been published regarding reverse drainage structures inside the dam, inventions concerning the sealing of these reverse drainage pipes are fewer. For example, patent CN 222375338U proposes a reverse drainage sealing device that extends the reverse drainage pipe towards the upstream slope of the toe slab, with multiple drainage valves spaced apart to ensure smooth drainage of water from the dam during the backfilling process. This structure can ensure smooth drainage of water from the dam during backfilling, but the slope drainage pipe requires drainage valves, concrete wrapping, and reinforcing bars, making the construction process numerous and cumbersome. Therefore, there is an urgent need for a novel reverse drainage pipe sealing structure for rockfill dam panels to solve the aforementioned problems. Utility Model Content

[0003] The purpose of this utility model is to overcome the above-mentioned shortcomings and provide a reverse drainage pipe sealing structure for panel rockfill dams to ensure that water inside the dam can be discharged during the paving and filling process in front of the dam.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a reverse drainage pipe sealing structure for a rockfill dam with a panel, including a toe plate at the bottom of the dam front cover, one side of the toe plate being connected to the lower side of the panel, a pre-embedded steel pipe at the bottom of the rockfill dam with the pre-embedded steel pipe passing through the toe plate and being led to a water collection pit upstream of the toe plate, and multiple circular culverts being set in sections on the water collection pit.

[0005] Preferably, the circular culvert is equipped with a water pump for pumping out water accumulated in the sump.

[0006] Preferably, the height of each section of the circular culvert does not exceed 2m.

[0007] Preferably, the inner diameter of the circular culvert is not less than 1.5m.

[0008] Preferably, cement mortar is used to seal and stop water at the joints of every two adjacent sections of the circular culvert.

[0009] Preferably, a ladder is also pre-installed inside the circular culvert.

[0010] Preferably, after all the water in the sump has been pumped out, the pre-embedded steel pipe is filled with expanding cement mortar for backfilling and sealing.

[0011] Preferably, after the reverse grouting of the pre-embedded steel pipe is completed, concrete is backfilled in the range of 3-5m from the bottom of the multi-section circular pipe culvert; the other areas of the multi-section circular pipe culvert are covered with dam front cover.

[0012] Preferably, the center of the sump coincides with the center of the culvert.

[0013] Preferably, the bottommost circular culvert has a through hole on its side for inserting a pre-embedded steel pipe.

[0014] The beneficial effects of this utility model are as follows: By setting up a circular culvert in the paving in front of the dam and reserving a drainage channel, this utility model ensures that water inside the dam can be discharged during the paving construction process; its construction procedure is simple and the construction speed is fast. After application testing in engineering examples, it can effectively ensure the safety of the panel structure during the paving construction process. It has achieved good results in engineering practice and has a wide range of engineering application value. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a reverse drainage pipe sealing structure for a panel rockfill dam. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] like Figure 1 As shown, a reverse drainage pipe sealing structure for a rockfill dam includes a toe plate 3 located at the bottom of the dam front cover 5. One side of the toe plate 3 is connected to the lower side of the panel 1. A pre-embedded steel pipe 2 is provided at the bottom of the rockfill dam. One end of the pre-embedded steel pipe 2 passes through the toe plate 3 and is led to a water collection pit 4 upstream of the toe plate 3. Multiple circular culverts 6 are provided in sections on the water collection pit 4.

[0018] Preferably, the circular culvert 6 is equipped with a water pump for pumping out water accumulated in the sump 4.

[0019] Preferably, the height of each section of the circular culvert 6 does not exceed 2m.

[0020] Preferably, the inner diameter of the circular culvert 6 is not less than 1.5m.

[0021] Preferably, cement mortar is used to seal and stop water at the joints of every two adjacent sections of the circular culvert.

[0022] Preferably, a ladder is also pre-installed inside the circular culvert 6.

[0023] Preferably, after all the water in the sump 4 has been pumped out, the pre-embedded steel pipe 2 is filled with expanding cement mortar for backfilling and sealing.

[0024] Preferably, after the reverse grouting of the pre-embedded steel pipe 2 is completed, the multi-section circular pipe culvert 6 is backfilled with concrete in the range of 3-5m from the bottom; the other areas of the multi-section circular pipe culvert 6 are covered with dam front cover 5.

[0025] Preferably, the center of the water collection pit 4 coincides with the center of the circular culvert 6.

[0026] Preferably, the bottommost circular culvert 6 has a through hole on its side for inserting the pre-embedded steel pipe 2.

[0027] In the above technical solution, before the dam front cover is filled, a pre-embedded steel pipe is led to the upstream sump of the toe slab. Circular culverts are installed in sections on the sump, each section not exceeding 2m in length and with an inner diameter of not less than 1.5m. The joints of the culverts are sealed with cement mortar for water prevention. After each section of the culvert is completed, the dam front cover within the elevation range of the culvert can be filled. As the culvert rises, the dam front cover is filled accordingly until the design elevation is reached.

[0028] During the dam front paving construction, a water pump is installed inside the circular culvert to drain the water accumulated in the sump. After the dam front paving is filled to the design elevation and all the water in the sump is pumped out, workers descend to the bottom of the circular culvert via a soft ladder or a ladder pre-installed inside the circular culvert to seal the pre-embedded steel pipe.

[0029] The pre-embedded steel pipe is backfilled and sealed with expansive cement mortar, and appropriate pressure can be applied. After the pre-embedded steel pipe is grouted, the bottom area (about 3-5m) of the circular culvert is backfilled with concrete to seal it, and the upper part of the circular culvert is backfilled with paving material until the design elevation.

[0030] The specific construction steps for this embodiment are as follows: 1) Before the dam front cover 5 is filled, the pre-embedded steel pipe 2 is led to the upstream sump 4 of the toe plate.

[0031] 2) Circular culverts 6 are installed in sections on the sump pit 4, and the joints of the circular culverts 6 are sealed with cement mortar to prevent water seepage. After each section of the circular culvert 6 is completed, the dam front cover 5 within the elevation range of the circular culvert can be filled. As the circular culvert 6 rises, the dam front cover 5 is filled and raised accordingly until the design elevation is reached.

[0032] 3) During the filling of the dam front cover 5, a water pump is installed in the circular culvert 6 to pump out the water accumulated in the sump 4. After the dam front cover 5 is filled to the design elevation, and after all the water in the sump 4 is pumped out, workers will go down to the bottom of the circular culvert 6 to seal the pre-embedded steel pipe 2 by means of a soft ladder or a ladder pre-set in the circular culvert 6.

[0033] 4) The pre-embedded steel pipe 2 is backfilled and sealed with expansive cement mortar, and appropriate pressure can be applied. After the pre-embedded steel pipe 2 is grouted, the bottom area (about 3-5m) of the circular culvert 6 is backfilled with concrete to seal it, and the upper part of the circular culvert 6 is backfilled with covering material until the design elevation.

[0034] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A reverse drainage pipe sealing structure for a rockfill dam with a panel, comprising a toe plate (3) located at the bottom of a dam front cover (5), wherein one side of the toe plate (3) is connected to the lower side of the panel (1), and a pre-embedded steel pipe (2) is provided at the bottom of the rockfill dam with the panel, characterized in that: One end of the pre-embedded steel pipe (2) passes through the toe plate (3) and is led to the water collection pit (4) upstream of the toe plate (3). Multiple circular culverts (6) are set in sections on the water collection pit (4).

2. The reverse drainage pipe sealing structure for a panel rockfill dam according to claim 1, characterized in that: The circular culvert (6) is equipped with a water pump for pumping out water accumulated in the sump (4).

3. The reverse drainage pipe sealing structure for a panel rockfill dam according to claim 1, characterized in that: The height of each section of the circular culvert (6) shall not exceed 2m.

4. A sealing structure for the reverse drainage pipe of a panel rockfill dam according to claim 1 or 3, characterized in that: The inner diameter of the circular culvert (6) shall not be less than 1.5m.

5. The reverse drainage pipe sealing structure for a panel rockfill dam according to claim 1, characterized in that: Cement mortar is used to seal and stop water at the joint of every two adjacent sections of the circular culvert (6).

6. The reverse drainage pipe sealing structure for a panel rockfill dam according to claim 1, characterized in that: The circular culvert (6) is also equipped with a ladder.

7. The reverse drainage pipe sealing structure for a panel rockfill dam according to claim 1, characterized in that: After all the water in the sump (4) is pumped out, the pre-embedded steel pipe (2) is filled with expanding cement mortar for backfilling and sealing.

8. The reverse drainage pipe sealing structure for a panel rockfill dam according to claim 1, characterized in that: After the pre-embedded steel pipe (2) is grouted in reverse, the multiple circular culverts (6) are backfilled with concrete 3-5m away from the bottom; the other areas of the multiple circular culverts (6) are covered with dam front cover (5).

9. A sealing structure for the reverse drainage pipe of a panel rockfill dam according to claim 1, characterized in that: The center of the water collection pit (4) coincides with the center of the circular culvert (6).

10. A sealing structure for the reverse drainage pipe of a panel rockfill dam according to claim 1, characterized in that: The bottommost circular culvert (6) has a through hole on its side for inserting the pre-embedded steel pipe (2).

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