Underwater repairing cofferdam structure of reservoir bottom geomembrane anti-seepage blanket
By designing an underwater repair cofferdam structure including an outer cylinder and an inner cylinder, the problem of difficulty in repairing the geomembrane at the bottom of the reservoir under low water level in the prior art is solved, and repairing is achieved while maintaining a stagnant water level is avoided, and economic losses caused by emptying the reservoir are avoided.
Patent Information
- Application Number
- CN202421576612.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-05
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-05
AI Technical Summary
The existing technology is difficult to repair the geomembrane at the bottom of the reservoir under low water levels, resulting in the need to empty the reservoir, resulting in economic losses and loss of operating income.
A cofferdam structure with anti-seepage laying of the base of the reservoir was designed, including the cofferdam body composed of the outer cylinder and the inner cylinder. It is connected into one by a vertical reinforced plate, and an external reinforced ring, an inner reinforced ring, a bottom reinforced ring, an iron sand strip and a water stop structure are installed to achieve dry ground construction conditions.
It is realized that the repaired parts are fenced without completely emptying the reservoir, avoiding the economic losses caused by emptying the reservoir, reducing the repair costs, and the finished structure can be reused.
Smart Images
Figure CN222923775U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an underwater repair cofferdam structure for an impervious blanket of a geomembrane at the bottom of a reservoir, which is applicable to the anti-seepage repair project of a reservoir with a geomembrane used for anti-seepage at the bottom of the reservoir. Background Technique
[0002] At present, with the rapid development of pumped-storage power stations, there are more and more reservoir projects with geomembranes used for anti-seepage at the bottom of the reservoir, and basically membrane-cloth separated geomembranes are adopted. Generally, sandbags arranged at intervals are used for pressing and covering at the upper part. After long-term operation, the geomembrane is damaged and needs to be repaired. However, the geomembrane has poor resistance to external forces. Even under the condition of low water level operation, it is difficult to build an earth-rock cofferdam for enclosure construction. The current repair methods are all to empty the reservoir for system inspection and repair. In addition to the direct economic losses caused by emptying the reservoir, the whole reservoir stops operating during the repair period, resulting in obvious losses of operating income and huge costs. At present, the water depth at the dead water level of the reservoir of a pumped-storage power station with full reservoir basin anti-seepage is generally relatively shallow, usually about 3m. If the repair work can be completed while maintaining the dead water level, the water level can be controlled near the dead water level by normal power generation or pumping of the power station, reducing the water volume loss caused by emptying the reservoir and the economic losses caused by re-filling the water. Summary of the Invention
[0003] The purpose of the utility model is to provide a cofferdam structure for underwater repair of an impervious blanket of a geomembrane at the bottom of a reservoir, which can enclose the part to be repaired and realize dry construction conditions without completely emptying the reservoir.
[0004] In order to achieve the above purpose, the present solution provides an underwater repair cofferdam structure for an impervious blanket of a geomembrane at the bottom of a reservoir, including a cofferdam body composed of an outer cylinder and an inner cylinder. A water collection cavity is formed between the outer cylinder and the inner cylinder and is connected into one body through vertical stiffening plates. An external stiffening ring is arranged on the outer wall of the outer cylinder, an internal stiffening ring is arranged on the inner wall of the outer cylinder, a bottom external stiffening ring is arranged on the outer bottom wall of the outer cylinder. An external iron sand strip and an internal iron sand strip are respectively arranged at the bottoms of the outer cylinder and the inner cylinder. External water stops and internal water stops are respectively arranged on the bottom of the outer cylinder and the inner cylinder. A cover plate is also arranged in the outer cylinder, and a valve is arranged on the cover plate.
[0005] Further, the height H1 of the outer cylinder is 3 - 5m, the height H2 of the inner cylinder is 50cm, the diameter Φ1 of the outer cylinder is 5 - 8m, the height H3 of the vertical stiffening plate is 30cm, and the wall thickness K of the outer cylinder, the inner cylinder and the vertical stiffening plate is 10cm.
[0006] Further, the cover plate is arranged on the internal stiffening ring in the middle of the outer cylinder.
[0007] Further, an annular rubber cushion plate and bolt anchor fittings are arranged on the inner stiffening ring, and the cover plate is arranged on the annular rubber cushion plate and anchored by the bolt anchor fittings.
[0008] Further, the valve includes a valve hole and a valve cap, and the aperture Φ2 of the valve hole is 40 cm.
[0009] Further, the widths W of the outer iron sand strip and the inner iron sand strip are 20 cm, and the lengths of the outer iron sand strip and the inner iron sand strip are 1 m longer than the outer circumferential lengths of the outer cylinder and the inner cylinder respectively.
[0010] The beneficial effects of the impervious blanket underwater repair cofferdam structure of the geomembrane at the bottom of the reservoir of the present utility model are as follows: dry construction of the impervious structure of the geomembrane at the bottom of the reservoir in the shallow water area can be realized, the economic losses caused by emptying the reservoir are avoided, and the finished structure can be reused, reducing the repair cost. Description of the Drawings
[0011] Figure 1 is a schematic diagram of the cofferdam structure of the present utility model;
[0012] Figure 2 is Figure 1 the schematic cross-sectional view of E-E of
[0013] Figure 3 is Figure 1 the partial enlarged view at F of Detailed Embodiment
[0014] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art shall fall within the protection scope of the present utility model.
[0015] Those skilled in the art should understand that in the disclosure of the utility model, the orientation or positional relationships indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations to the present invention.
[0016] This embodiment provides an impervious blanket underwater repair cofferdam structure for the bottom of a reservoir, as shown in Figure 1 — Figure 3As shown in the figure, it includes a cofferdam body composed of an outer cylinder 1 and an inner cylinder 6. A water collection chamber 15 is formed between the outer cylinder 1 and the inner cylinder 6, and they are connected into one body through vertical stiffening plates 7. An external stiffening ring 2 is arranged on the outer wall of the outer cylinder 1, an internal stiffening ring 4 is arranged on the inner wall of the outer cylinder 1, a bottom external stiffening ring 3 is arranged on the bottom outer wall of the outer cylinder 1. External iron sand strips 10 and internal iron sand strips 11 are respectively arranged at the bottoms of the outer cylinder 1 and the inner cylinder 6. External water stops 8 and internal water stops 9 are respectively arranged on the bottom surfaces of the outer cylinder 1 and the inner cylinder 6. A cover plate 12 is also arranged inside the outer cylinder 1, and a valve 13 is arranged on the cover plate.
[0017] This solution is an integral double-cylinder structure with double flexible channels at the bottom. The outer cylinder 1 is the outer cofferdam, and its height is higher than the water depth. The inner cylinder 6 is the inner cofferdam, and its height is generally about 50 cm. A water collection chamber 15 is formed between the outer cylinder 1 and the inner cylinder 6. Multiple uniformly distributed external stiffening rings 2 and a bottom external tightening ring 3 are provided on the outer wall of the outer cylinder 1 to increase its overall stiffness. An internal stiffening ring 4 is provided in the middle of the inner wall. The outer cylinder 1 and the inner cylinder 6 are connected by vertical stiffening plates 7 to form an integral structure. The height of the vertical stiffening plate 7 is 30 cm, and 20 cm is left at the bottom. The thicknesses of the outer cylinder 1, the inner cylinder 6, and the stiffening plates are all 10 cm. To facilitate water transportation, a closed cover plate 12 is provided in the middle of the outer cylinder 1. The cover plate 12 is closed by using the internal stiffening ring 4. An annular rubber gasket 5 and uniformly distributed bolt anchors are provided on the internal stiffening ring 4 for anchoring the cover plate 12. A valve 13 that can be opened is provided in the middle of the cover plate 12, and the diameter of the valve is about 40 cm. Flexible water stops are respectively provided on the outer sides of the bottoms of the outer cylinder 1 and the inner cylinder 6 to form an outer water stop 8 and an inner water stop 9. The outer water stop 8 and the inner water stop 9 are respectively made of flexible PVC geomembrane (smooth membrane), arranged in an "L"-shaped cross-section in a ring shape. The flexible water stops are pressed by the external water pressure and closely adhere to the surface of the geomembrane to form a water-stop effect. To make the water stop have a good shape and ensure that the whole does not curl and deform during the diving process, the gradually changing shape with thinner sides and thicker middle is adopted at the turning part of the cross-section. The two sides are divided into an anchoring part and a water-stop pasting part. The extension width of the water-stop pasting part of the outer water stop 8 is not less than 60 cm, and the width of the water-stop pasting part of the inner water stop 9 is not less than 30 cm and less than the net width of the water collection chamber between the inner and outer cylinders. The membrane thicknesses of the outer water stop 8 and the inner water stop 9 except for the thickening part are 1 - 1.5 mm and 0.5 - 1.0 mm respectively. The thinner the membrane thickness, the more conducive it is to pasting the water stop, but it is easy to be damaged. And the outer water stop 8 and the inner water stop 9 are vulnerable parts, so new ones need to be replaced before each use. At the same time, to strengthen the pasting effect of the inner and outer water stops, inner and outer iron sand strips 11 and 10 are respectively provided as auxiliary weights. The inner and outer iron sand strips 11 and 10 are made of flexible canvas and have a sealed structure. They are respectively hung on the outer sides of the inner and outer cylinders 6 and 1. The diameter of the flexible canvas belt of the iron sand strip is 20 cm, and the lengths are respectively 1 m longer than the outer circumferences of the inner and outer cylinders. Iron sand is filled inside, and the ports are butt-jointed and sealed. The amount of sand filled inside is about 0.9 of the maximum volume of the bag. This ratio can not only avoid the concentrated distribution of sand in the iron sand strip and the vacancy in some places, but also make the iron sand strip have a certain flexibility.
Claims
1. The geomembrane anti-seepage blanket at the bottom of the reservoir is used to repair the cofferdam structure underwater, which is characterized by The invention comprises a cofferdam body composed of an outer cylinder (1) and an inner cylinder (6), wherein a water collecting chamber (15) is formed between the outer cylinder (1) and the inner cylinder (6), and the outer cylinder (1) and the inner cylinder (6) are connected into one body via a vertical reinforcing plate (7); an outer reinforcing ring (2) is arranged on the outer wall of the outer cylinder (1); an inner reinforcing ring (4) is arranged on the inner wall of the outer cylinder (1); a bottom outer reinforcing ring (3) is arranged on the bottom outer wall of the outer cylinder (1); outer iron sand strips (10) and inner iron sand strips (11) are arranged at the bottoms of the outer cylinder (1) and the inner cylinder (6), respectively; an outer water stop (8) and an inner water stop (9) are arranged at the bottoms of the outer cylinder (1) and the inner cylinder (6), respectively; a cover plate (12) is arranged inside the outer cylinder (1), and a valve (13) is arranged on the cover plate.
2. The reservoir bottom geomembrane anti-seepage blanket underwater repair cofferdam structure according to claim 1 is characterized in that The height H1 of the outer cylinder (1) is 3-5 m, the height H2 of the inner cylinder (6) is 50 cm, the diameter Φ1 of the outer cylinder (1) is 5-8 m, the height H3 of the vertical stiffening plate (7) is 30 cm, and the wall thickness K of the outer cylinder (1), the inner cylinder (6) and the vertical stiffening plate (7) is 10 cm.
3. The reservoir bottom geomembrane anti-seepage blanket underwater repair cofferdam structure according to claim 1, characterized in that The cover plate (12) is arranged on the inner reinforcement ring (4) in the middle of the outer cylinder (1).
4. The reservoir bottom geomembrane anti-seepage blanket underwater repair cofferdam structure according to claim 1, characterized in that An annular rubber pad (5) and bolt anchors are arranged on the inner reinforcement ring (4); a cover plate (12) is arranged on the annular rubber pad (5) and is anchored by the bolt anchors.
5. The reservoir bottom geomembrane anti-seepage blanket underwater repair cofferdam structure according to claim 1, characterized in that The valve (13) comprises a valve hole (131) and a valve cap (132); the hole diameter Φ2 of the valve hole (131) is 40 cm.
6. The reservoir bottom geomembrane anti-seepage blanket underwater repair cofferdam structure according to claim 1, characterized in that The width W of the outer iron sand strips (10) and the inner iron sand strips (11) is 20 cm, and the lengths of the outer iron sand strips (10) and the inner iron sand strips (11) are 1 m longer than the outer circumferences of the outer cylinder (1) and the inner cylinder (6), respectively.