Dam body water passing transformation structure of small earth and rockfill dam

Abstract

The utility model discloses a small earth and rockfill dam body overflow transformation structure which comprises an earth and rockfill dam, a normal spillway, a dam crest overflow transformation structure, a step overflow transformation structure, a riding track overflow transformation structure and an arris body side slope overflow transformation structure. The edge lines, close to the dam body side, of the dam crest, the step overflowing transformation structure and the riding track overflowing transformation structure are located on the cross section of the border of the prism drainage and the bank slope, and the edge line, close to the dam body side, of the prism side slope overflowing transformation structure is consistent with the border line of the prism drainage and the mountain slope. By means of the structure, a new drainage channel for the overproof flood of the reservoir is opened up through the dam crest overflowing transformation structure, the step overflowing transformation structure, the riding track overflowing transformation structure and the prism side slope overflowing transformation structure.

Description

Technical Field

[0001] This utility model relates to the field of emergency spillway technology in buildings, and in particular to a water passage modification structure for a small earth-rock dam. Background Technology

[0002] Under conditions of excessive flooding, existing normal flood discharge facilities of earth-rock dams may not be able to discharge the excess floodwater downstream in a timely manner, potentially leading to dam overflow or even dam failure. The time when the reservoir water level exceeds the warning level during excessive flooding is often short, possibly only a few hours. Therefore, it is extremely important to know how to effectively discharge excessive floodwater that normal flood discharge facilities cannot handle in a short period, preventing flood overflow or even dam failure.

[0003] Existing large earth-rock dams primarily discharge excess floodwaters by constructing emergency spillways at reservoir passes, incurring significant land acquisition and compensation costs, as well as high construction costs for new channels. Small earth-rock dams, with heights less than 30 meters, rarely undergo emergency spillway modifications; utilizing existing river channels and modifying the dam body for short-term water passage is the most economical approach. Therefore, a new water passage modification structure for small earth-rock dams has emerged in this context. Utility Model Content

[0004] The purpose of this utility model is to provide a water discharge modification structure for a small earth-rock dam body, which opens up a new water discharge channel for reservoir floods exceeding the standard by means of a dam crest water discharge modification structure, a step water discharge modification structure, a ramp water discharge modification structure, and a prism side slope water discharge modification structure.

[0005] To achieve the above objectives, a small earth-rock dam body water flow modification structure is provided, including an earth-rock dam, a normal spillway, a dam crest flow modification structure, a stepped flow modification structure, a ramp flow modification structure, and a prism side slope flow modification structure.

[0006] According to the aforementioned small earth-rock dam body water passage modification structure, the edge lines of the dam crest, step flow passage modification structure and the ramp flow passage modification structure located on the cross section at the junction of the prism drainage and the bank slope, and the edge line of the prism side slope flow passage modification structure located on the dam body, which is consistent with the junction line of the prism drainage and the mountain slope.

[0007] According to the aforementioned small earth-rock dam body water flow modification structure, the dam crest water flow modification structure is located on the dam crest and includes an upstream block and a downstream block. A joint water stop is provided between the upstream block and the downstream block. A cover plate is provided on the top of the upstream block and the downstream block. The upstream block includes a dam crest modification water inlet, a bottom slab of the upstream block, a retaining wall of the upstream block, and a wave wall. The downstream block includes a toothed wall of the downstream block, a bottom slab of the downstream block, and a retaining wall of the downstream block.

[0008] According to the aforementioned small earth-rock dam body water passage modification structure, the modified water inlet at the dam crest is an inclined surface with the same inclination slope as the upstream dam face. The modified water inlet at the dam crest includes a scour wall on the side of the upstream block of the dam crest and a scour wall on the bottom of the upstream block of the dam crest. The bottom elevation of the modified water inlet at the dam crest is one meter lower than the bottom of the scour wall, and the net width of the water passage is two meters. The area within one-third of the width of the modified water inlet at the dam crest is filled with clay, and the top elevation of the clay pile is level with the check water level.

[0009] According to the aforementioned small earth-rock dam body water passage modification structure, the stepped flow passage modification structure is a segmented prefabricated structure, including steps, sloping retaining walls, overlapping platforms, overlapping slopes and anti-slip toothed walls, with supporting piles driven behind the anti-slip toothed walls.

[0010] According to the aforementioned small earth-rock dam body water passage modification structure, the walkway water passage modification structure is a prefabricated structure, including a walkway base slab, walkway retaining walls on both sides, walkway overlapping platform, walkway overlapping slope, walkway front tooth wall and walkway rear tooth wall.

[0011] According to the aforementioned small earth-rock dam body water passage modification structure, the prism-side slope water passage modification structure is similar to the stepped water passage modification structure.

[0012] According to the aforementioned small earth-rock dam body water passage modification structure, the downstream block tooth wall of the dam crest overlaps on the overlapping platform of the upper part of the stepped flow passage modification structure. The bottom of the high-elevation precast block of the stepped flow passage modification structure can overlap on the overlapping platform of the low-elevation precast block. The bottom of the precast block of the stepped flow passage modification structure can also overlap on the overlapping platform of the precast block of the walkway flow passage modification structure. The bottom tooth wall of the precast block of the walkway flow passage modification structure can also overlap on the overlapping platform of the precast block of the prism-side slope flow passage modification structure.

[0013] According to the aforementioned small earth-rock dam body water passage modification structure, the stepped flow passage modification structure, the ramp flow passage modification structure, and the prism side slope flow passage modification structure have a net width of two meters, and the retaining walls on both sides are one meter high and thirty centimeters thick.

[0014] This utility model has the following beneficial effects:

[0015] 1. Compared with existing technologies, this small earth-rock dam body water passage modification structure opens up new water discharge channels for reservoir floods exceeding the standard through the dam crest water passage modification structure, step water passage modification structure, ramp water passage modification structure and prism side slope water passage modification structure.

[0016] 2. Compared with the existing technology, the water flow modification structure of this small earth-rock dam has a step structure on the dam crest that can dissipate energy for the downstream water flow. The overlapping platform, the ramp overlapping platform, and the ramp overlapping slope can prevent leakage of the downstream water flow. The supporting piles and toothed walls at the bottom of the overlapping platform of the step water flow modification structure can effectively prevent sliding.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0019] Figure 1 This is a schematic diagram of the flow arrangement of a small earth-rock dam body water passage modification structure according to the present invention;

[0020] Figure 2 This is a cross-sectional view of the stepped flow modification structure of a small earth-rock dam body water passage modification structure according to this utility model;

[0021] Figure 3 This is a cross-sectional view of the ramp flow modification structure of a small earth-rock dam body water passage modification structure according to this utility model.

[0022] Figure 4 This is a cross-sectional view of the dam crest flow modification structure of a small earth-rock dam body water passage modification structure according to the present invention;

[0023] Figure 5 This is a schematic diagram of the flow inlet at the top of a small earth-rock dam, which is a water passage modification structure for the dam body of this utility model.

[0024] Legend:

[0025] 1. Earth-rock dam; 2. Dam crest flow modification structure; 21. Downstream block base slab of dam crest; 22. Downstream block retaining wall of dam crest; 23. Downstream block toothed wall of dam crest; 24. Upstream block base slab of dam crest; 25. Upstream block retaining wall of dam crest; 26. Side scour protection wall of upstream block of dam crest; 27. Bottom scour protection wall of upstream block of dam crest; 28. Wave wall; 29. ​​Joint sealing; 3. Dam crest modified inlet; 4. Step flow modification structure; 41. Step ; 42. Sloping retaining wall; 43. Overlapping platform; 44. Overlapping slope; 45. Anti-slip toothed wall; 46. Support pile; 5. Pathway flow modification structure; 51. Pathway bottom slab; 52. Pathway retaining wall; 53. Pathway overlapping platform; 54. Pathway overlapping slope; 55. Pathway front toothed wall; 56. Pathway rear toothed wall; 6. Normal spillway; 7. Prism drainage; 8. Prism side slope flow modification structure; 9. Mountain slope. Detailed Implementation

[0026] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0027] Reference Figure 1-5 This utility model embodiment provides a small earth-rock dam body water passage modification structure, which includes an earth-rock dam 1, a normal spillway 6, a dam crest water passage modification structure 2, a stepped water passage modification structure 4, a ramp water passage modification structure 5, and a prism side slope water passage modification structure 8.

[0028] When floodwaters exceed the standard, the normal spillway 6 may not be able to discharge the excess floodwaters in time. To prevent the excess floodwaters from overflowing through the earth-rock dam 1, an emergency spillway is required. To reduce the risk of erosion of the dam body and the mountain behind the dam by excess discharge, the edge lines of the dam crest, stepped flow modification structure 4, and ramp flow modification structure 5 are located on the cross section at the junction of the prism drainage 7 and the bank slope. The edge line of the prism side slope flow modification structure 8 is aligned with the junction of the prism drainage 7 and the mountain slope 9. Through the dam crest flow modification structure 2, stepped flow modification structure 4, ramp flow modification structure 5, and prism side slope flow modification structure 8, an emergency spillway is formed to discharge the excess floodwaters to the downstream river channel. Because of the steps, one can climb from the downstream of the dam to the dam crest. Therefore, when not discharging water, the dam crest flow modification structure 2 can be used as a downstream step.

[0029] The dam crest flow modification structure 2 is located on the dam crest and includes an upstream block and a downstream block. A joint waterstop 29 is provided between the upstream block and the downstream block. The top of the upstream block and the downstream block is provided with a cover plate. The upstream block includes a dam crest modification inlet 3, a bottom plate 24, a retaining wall 25, and a wave wall 28. The downstream block includes a toothed wall 23, a bottom plate 21, and a retaining wall 22.

[0030] To prevent the upstream dam slope from being eroded by excessive floodwaters, the dam crest modified intake 3 is an inclined surface with the same slope as the upstream dam face. The dam crest modified intake 3 includes a scour wall 26 on the side of the upstream block of the dam crest and a scour wall 27 on the bottom of the upstream block of the dam crest. The bottom elevation of the dam crest modified intake 3 is one meter lower than the bottom of the wave wall 28, and the net width of the water passage is two meters. The dam crest modified intake 3 is filled with clay within one-third of its width. The top elevation of the clay pile is level with the check water level. When the reservoir water level exceeds the design water level, approaches or exceeds the check water level, the reservoir water will overflow the clay pile and cause it to collapse by gravity.

[0031] The stepped flow modification structure 4 is a segmented prefabricated structure, including steps 41, sloping retaining walls 42, overlapping platforms 43, overlapping slopes 44, and anti-slip toothed walls 45. Support piles 46 are driven behind the anti-slip toothed walls 45. Steps 41 can dissipate energy for the downstream water flow and prevent the prefabricated stepped flow modification structure on the slope behind the dam from sliding.

[0032] The crosswalk flow modification structure 5 is a prefabricated structure, including a crosswalk base slab 51, crosswalk retaining walls on both sides 52, crosswalk overlapping platform 53, crosswalk overlapping ramp 54, crosswalk front toothed wall 55, and crosswalk rear toothed wall 56.

[0033] The slope-side flow modification structure 8 is similar to the step flow modification structure 4.

[0034] To prevent leakage, the downstream block tooth wall 23 of the dam crest overlaps on the overlapping platform 43 of the upper part of the stepped flow modification structure 4. The bottom of the high-elevation step precast block of the stepped flow modification structure 4 can overlap on the overlapping platform 43 of the low-elevation precast block. The bottom of the precast block of the stepped flow modification structure 4 can also overlap on the crosswalk overlapping platform 53 of the precast block of the crosswalk flow modification structure 5. The bottom tooth wall of the crosswalk flow modification structure 5 can also overlap on the overlapping platform of the precast block of the prism-side slope flow modification structure 8.

[0035] 4. Step flow passage modification structure; 5. Horse path flow passage modification structure; 8. Ramp flow passage modification structure beside prism: net width of 2 meters, with retaining walls on both sides 1 meter high and 30 centimeters thick.

[0036] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A water-passage modification structure for a small earth-rock dam, characterized in that: Including earth-rock dam (1), normal spillway (6), dam crest flow modification structure (2), stepped flow modification structure (4), ramp flow modification structure (5), and prism side slope flow modification structure (8); The edge lines of the dam top, step flow modification structure (4) and the horse path flow modification structure (5) are located on the cross section at the junction of the prism drainage (7) and the bank slope. The edge line of the prism side slope flow modification structure (8) is consistent with the junction line of the prism drainage (7) and the mountain slope (9). The dam crest flow modification structure (2) is located on the dam crest and includes an upstream block and a downstream block. A joint water stop (29) is provided between the upstream block and the downstream block. A cover plate is provided on the top of the upstream block and the downstream block. The upstream block includes a dam crest modification inlet (3), a bottom plate (24), a retaining wall (25), and a wave wall (28). The downstream block includes a toothed wall (23), a bottom plate (21), and a retaining wall (22).

2. The water passage modification structure for a small earth-rock dam body according to claim 1, characterized in that: The modified water inlet (3) at the top of the dam is an inclined surface with the same slope as the upstream dam surface. The modified water inlet (3) at the top of the dam includes a scour wall (26) on the side of the upstream block of the dam top and a scour wall (27) on the bottom of the upstream block of the dam top. The bottom elevation of the modified water inlet (3) at the top of the dam is one meter lower than the bottom of the wave wall (28), and the net width of the water passage is two meters. The top one-third of the width of the modified water inlet (3) at the top of the dam is filled with clay, and the top elevation of the clay pile is level with the check water level.

3. The water passage modification structure for a small earth-rock dam according to claim 2, characterized in that: The stepped flow modification structure (4) is a segmented prefabricated structure, including a step (41), a sloping retaining wall (42), an overlapping platform (43), an overlapping slope (44), and an anti-slip toothed wall (45), with supporting piles (46) driven behind the anti-slip toothed wall (45).

4. The water passage modification structure for a small earth-rock dam according to claim 3, characterized in that: The modified structure (5) for the horse walkway is a prefabricated structure, including a horse walkway base plate (51), horse walkway retaining walls on both sides (52), horse walkway overlapping platform (53), horse walkway overlapping slope (54), front toothed wall of the horse walkway (55), and rear toothed wall of the horse walkway (56).

5. The water passage modification structure for a small earth-rock dam according to claim 1, characterized in that: The downstream block tooth wall (23) of the dam crest overlaps on the overlapping platform (43) of the upper part of the stepped flow modification structure (4). The bottom of the high-elevation step precast block of the stepped flow modification structure (4) overlaps on the overlapping platform (43) of the low-elevation precast block. The bottom of the precast block of the stepped flow modification structure (4) overlaps on the crosswalk overlapping platform (53) of the crosswalk flow modification structure (5). The bottom tooth wall of the crosswalk flow modification structure (5) overlaps on the overlapping platform of the precast block of the prism side slope flow modification structure (8).

6. The water passage modification structure for a small earth-rock dam according to claim 5, characterized in that: The stepped flow modification structure (4), the horse path flow modification structure (5), and the prism side slope flow modification structure (8) have a net width of two meters, and the retaining walls on both sides are one meter high and thirty centimeters thick.

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