Anti-scouring structure suitable for high-flow-velocity opposite-flushing covering layer bank slope and construction method

Abstract

The invention provides an anti-scouring structure suitable for a high-flow-velocity hedging covering layer bank slope, a base is arranged on the surface of a ground layer in a filling manner, the elevation of the top surface of the base is higher than that of a normal water line, so that the base forms a construction platform of an anti-scouring wall structure, and a protection slope is arranged on the upstream face of the base; a slotted hole matched with the anti-undermining wall structure is formed in the base, and an extending section extending out of the base is arranged at the bottom end of the slotted hole, so that the bottom end of the anti-undermining wall structure penetrates through a ground layer to be connected into a bedrock layer; the anti-panning wall structure comprises a front anti-panning wall and a rear anti-panning wall which are layered, an interval space is formed between the front anti-panning wall and the rear anti-panning wall in the transverse direction, and supporting piers connected with the front anti-panning wall and the rear anti-panning wall are arranged in the interval space. Through the layered anti-undermining wall structure, the requirement for the thickness of a single-row wall body can be reduced, mechanical construction operation can be facilitated, and the construction efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of water conservancy and hydropower engineering, and particularly relates to an anti-scouring structure and construction method for high-velocity scouring and covering layer slopes applicable to high-velocity scouring and covering layer slopes. Background Art

[0002] In water conservancy and hydropower engineering, slope anti-scouring is a common construction measure, which is widely used in many fields such as high-velocity flow, head-on impact, scouring of covering layer slopes, and river regulation. High-velocity head-on impact covering layer slopes have potential safety hazards of scouring and collapse under adverse conditions such as flood exceeding the standard during the flood season, and accidents of casualties and property losses caused by slope scouring and collapse.

[0003] For the above slopes, when there are permanent buildings on the upper part of the slope, it is necessary to carry out anti-scouring treatment on the slope, and the anti-scouring measures themselves need to have a certain degree of stability and durability. Among the common slope anti-scouring measures in the prior art, in the structure combining a cut-off wall and a concrete retaining wall, because a single concrete cut-off wall is used, it is required that the wall is relatively thick, which will lead to difficult trench forming of the cut-off wall, long construction period, and high overall cost; if curtain grouting, concrete slope paving, gabion cages or other structures are used, although the construction is simple and the period is short, the durability is poor and the safety factor is relatively low, and there are still certain safety hazards for anti-scouring of high-velocity head-on impact covering layer slopes. Moreover, when there are other permanent buildings on the upper part, the safety and stability cannot be guaranteed. Therefore, it is necessary to design an anti-scouring structure and construction method for high-velocity head-on impact covering layer slopes to solve the above practical engineering problems. Summary of the Invention

[0004] The first object of the present invention is to provide an anti-scouring structure for slopes that can reduce the requirement for the wall thickness and ensure the stability of the slope at the same time. For this purpose, the present invention adopts the following technical solutions:

[0005] An anti-scouring structure for high-velocity head-on impact covering layer slopes, a base is filled and set on the surface of the ground layer, the top elevation of the base is higher than the normal water level elevation, so that the base forms a construction platform for the anti-scouring wall structure, and a slope protection is provided on the water-facing side of the base; a slot hole matching with the anti-scouring wall structure is opened in the base, and an extension section extending out of the base is arranged at the bottom end of the slot hole, so that the bottom end of the anti-scouring wall structure passes through the ground layer and is connected to the bedrock layer; the anti-scouring wall structure includes a layered front anti-scouring wall and a rear anti-scouring wall, and there is a spacing space between the front anti-scouring wall and the rear anti-scouring wall in the transverse direction, and a support pier connecting the front anti-scouring wall and the rear anti-scouring wall is arranged in the spacing space, so that the front anti-scouring wall and the rear anti-scouring wall form an integral common support state.

[0006] Furthermore: a top plate is commonly covered on the base and the top of the slope protection.

[0007] Furthermore, a notch is provided in the top plate above the anti-scouring wall structure, and a backfill and casting part connected to the front anti-scouring wall and the rear anti-scouring wall is filled in the notch.

[0008] Furthermore, the top surface of the support pier is flush with the top surface of the anti-scouring wall structure, and the top of the support pier is also connected to the backfill and casting part of the top plate.

[0009] Furthermore, the height of the stable section where the anti-scouring wall structure penetrates into the bedrock layer is not less than 1 / 3 of the height of the anti-scouring wall structure.

[0010] Furthermore, a connecting section that penetrates into the bedrock layer is provided at the bottom end of the support pier.

[0011] Furthermore, the height of the connecting section of the support pier is not less than 1 / 3 of the height of the support pier.

[0012] The second object of the present invention is to provide a construction method with convenient construction. For this purpose, the present invention adopts the following technical solutions:

[0013] A construction method for an anti-scouring structure applicable to high-flow-rate scouring-resistant bank slopes of overlying layers is as follows:

[0014] S1: A foundation is formed by backfilling with stone slag on the ground layer by the river, and large boulders are dumped on the water-facing side of the foundation to form a slope protection.

[0015] S2: The top plate is cast, and a notch for the construction of the anti-scouring wall structure and the support pier is reserved.

[0016] S3: The construction of the slot holes is carried out on the cast top plate platform. At the same time, the top plate is connected to the steel bars of the anti-scouring wall structure and the support pier with concrete at the notch position, and the anti-scouring wall structure and the support pier are cast accordingly.

[0017] S4: The construction of the backfill and casting part of the notch of the top plate is carried out, and the top plate is connected to the anti-scouring wall structure and the support pier to form an integral whole.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] Through the layered anti-scouring wall structure of the present invention, the requirement for the thickness of a single row of walls can be reduced, which is convenient for mechanized construction operations and improves construction efficiency. Moreover, the support pier and the top plate connect the front and rear anti-scouring walls into an integral whole, improving the integrity of the anti-scouring wall structure, ensuring the stability and safety of the front anti-scouring wall, effectively applicable to the anti-scouring treatment of high-flow-rate scouring-resistant bank slopes of overlying layers in water conservancy and hydropower projects, and ensuring the stable effect of the bank slope. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic cross-sectional view of the overall structure of the present invention;

[0021] Figure 2 Schematic diagram of the layout of the present invention;

[0022] Figure 3 Cross-sectional schematic diagram of the front anti-scouring wall of the present invention;

[0023] Figure 4 Cross-sectional schematic diagram of the rear anti-scouring wall of the present invention.

[0024] The reference signs in the drawings are: 1 - ground floor; 11 - bedrock layer; 2 - pedestal; 21 - slot hole; 3 - slope protection; 4 - top plate; 41 - backfill and casting part; 5 - anti-scouring wall structure; 51 - front anti-scouring wall; 52 - rear anti-scouring wall; 6 - support pier. Detailed implementation manners

[0025] The present invention will be further described below in conjunction with the drawings and embodiments, but it shall not be used as a basis for limiting the present invention.

[0026] As Figures 1-4 shown, a kind of anti-scouring structure suitable for high-flow scouring of the bank slope of the overlying layer is provided with a pedestal 2 filled and arranged on the surface of the ground floor 1. The top elevation of the pedestal 2 is higher than the normal water level elevation, so that the pedestal 2 forms a construction platform for the anti-scouring wall structure 5. A slope protection 3 is arranged on the water-facing surface of the pedestal 2; a slot hole 21 matching with the anti-scouring wall structure 5 is opened in the pedestal 2, and an extension section extending out of the pedestal 2 is arranged at the bottom end of the slot hole 21. The extension section of the slot hole 21 passes through the ground floor 1 and extends into the bedrock layer 11, so that the bottom end of the anti-scouring wall structure 5 passes through the ground floor 1 and is connected to the bedrock layer 11; the anti-scouring wall structure 5 includes a layered front anti-scouring wall 51 and a rear anti-scouring wall 52. The front anti-scouring wall 51 is closer to the slope protection 3 than the rear anti-scouring wall 52. The front anti-scouring wall 51 and the rear anti-scouring wall 52 respectively form a front row anti-scouring part and a rear row anti-scouring part; there is a spacing space between the front anti-scouring wall 51 and the rear anti-scouring wall 52 in the transverse direction, and a support pier 6 connecting the front anti-scouring wall 51 and the rear anti-scouring wall 52 is arranged in the spacing space, so that the front anti-scouring wall 51 and the rear anti-scouring wall 52 form an integral common supporting state.

[0027] In this embodiment, the pedestal 2 is backfilled with stone slag as the construction platform for the anti-scouring wall construction, providing a dry construction condition for the anti-scouring wall structure 5, and the construction is more convenient and fast. At the same time, the slope protection 3 is formed by throwing large stones for construction to prevent the construction platform from being scoured; if there is a scouring situation in the thrown stones, large stones can be replenished in time at the scoured part to provide a safe, reliable and convenient construction environment for the anti-scouring wall construction.

[0028] As Figure 1 shown, a top plate 4 is commonly covered on the pedestal 2 and the top of the slope protection 3, and the top plate 4 is formed by concrete casting.

[0029] As Figures 3-4As shown in the figure, the top plate 4 is provided with a notch above the anti-scouring wall structure 5, and the notch is filled with a backfill and casting part 41 connected to the front anti-scouring wall 51 and the rear anti-scouring wall 52. The connection strength between the anti-scouring wall structure 5 and the support pier 6 is further increased through the top plate 4, so as to ensure that the bank slope still has sufficient stability when being scoured by the river water.

[0030] In this embodiment, the top plate 4 uses a double-layer steel mesh at the notch to be welded into a whole with the steel reinforcement cage of the anti-scouring wall structure 5, so as to strengthen the integrity of the two rows of anti-scouring walls and ensure the stability of the front row of anti-scouring walls.

[0031] As Figure 1 , 3 As shown in Figure - 4, the top surface of the support pier 6 is flush with the top surface of the anti-scouring wall structure 5, and the top of the support pier 6 is also connected to the backfill and casting part 41 of the top plate 4. Moreover, a connecting section that penetrates deep into the bedrock layer 11 is provided at the bottom end of the support pier 6.

[0032] As Figures 1-4 shown, the height of the stable section where the anti-scouring wall structure 5 penetrates into the bedrock layer 11 is not less than 1 / 3 of the height of the anti-scouring wall structure 5. At the same time, the height of the connecting section of the support pier 6 is not less than 1 / 3 of the height of the support pier 6. This can ensure the stable safety of the anti-scouring wall structure 5.

[0033] Please refer to Figures 1-4 , when constructing the anti-scouring structure of the bank slope, the specific steps are as follows:

[0034] S1: Build a construction platform on the riverside ground layer 1 at the construction positions of the anti-scouring wall structure 5 and the support pier 6, and backfill with crushed stones to form a base 2. The top elevation of the base 2 is above the normal water level line, and large boulders are dumped on the water-facing side of the base 2 to form a slope protection 3, so that the slope protection 3 protects the anti-scouring wall structure 5 during the construction period;

[0035] S2: Pour concrete for the top plate 4 before constructing the anti-scouring wall structure 5 and the support pier 6, and reserve a notch for the construction of the anti-scouring wall structure 5 and the support pier 6 when pouring the top plate 4;

[0036] S3: Carry out the excavation construction of the slot holes 21 on the poured top plate 4 platform. At the same time, lower the steel reinforcement cages of the anti-scouring wall structure 5 and the support pier 6, connect the top plate 4 with the concrete at the notch position to the steel bars of the anti-scouring wall structure 5 and the support pier 6, and pour the anti-scouring wall structure 5 and the support pier 6 until they are formed;

[0037] S4: Carry out the construction of the backfill and casting part 41 of the notch of the top plate 4, and connect the top plate 4 with the anti-scouring wall structure 5 and the support pier 6 to form a whole.

[0038] The above embodiments are only a relatively optimal technical solution of the present invention. Those skilled in the art should understand that without departing from the principle and essence of the present invention, modifications or substitutions can be made to the technical solutions or parameters in the embodiments, and all should be covered within the protection scope of the present invention.

Claims

1. An anti-scouring structure suitable for high-flow scouring protection of the bank slope of the overlying layer, characterized in that: A base (2) is filled and set on the surface of the ground layer (1), and the elevation of the top surface of the base (2) is higher than the elevation of the normal water level line, so that the base (2) forms a construction platform for the anti-scouring wall structure (5). A slope protection (3) is provided on the water-facing surface of the base (2). A slot hole (21) matching the anti-scouring wall structure (5) is opened in the base (2). The bottom end of the slot hole (21) is provided with an extension section extending out of the base (2), so that the bottom end of the anti-scouring wall structure (5) passes through the ground layer (1) and is connected to the bedrock layer (11). The anti-scouring wall structure (5) includes a layered front anti-scouring wall (51) and a rear anti-scouring wall (52). The front anti-scouring wall (51) and the rear anti-scouring wall (52) have an interval space in the transverse direction. A support pier (6) connecting the front anti-scouring wall (51) and the rear anti-scouring wall (52) is arranged in the interval space, so that the front anti-scouring wall (51) and the rear anti-scouring wall (52) form an integral common support state.

2. The anti-scouring structure for high-flow velocity scouring-covering layer bank slopes according to claim 1, wherein: A top plate (4) is jointly covered on the top of the base (2) and the slope protection (3).

3. The anti-scouring structure for high-flow velocity scouring-covering layer bank slopes according to claim 2, characterized in that: A notch is provided on the top plate (4) above the anti-scouring wall structure (5), and a backfill and pouring part (41) connected to the front anti-scouring wall (51) and the rear anti-scouring wall (52) is filled in the notch.

4. The anti-scouring structure for high-flow velocity scouring-coverage bank slopes according to claim 3, characterized in that: The top surface of the support pier (6) is flush with the top surface of the anti-scouring wall structure (5), and the top of the support pier (6) is also connected to the backfill and pouring part (41) of the top plate (4).

5. The anti-scouring structure for high-flow velocity scouring-covering layer bank slopes according to claim 1, wherein: The height of the stable section where the anti-scouring wall structure (5) penetrates into the bedrock layer (11) is not less than 1 / 3 of the height of the anti-scouring wall structure (5).

6. The anti-scouring structure for high-flow velocity scouring-covering layer bank slopes according to claim 1, characterized in that: The bottom end of the support pier (6) is provided with a connecting section extending into the bedrock layer (11).

7. The anti-scouring structure for high-flow velocity scouring-covered bank slopes according to claim 6, wherein: The height of the connecting section of the support pier (6) is not less than 1 / 3 of the height of the support pier (6).

8. A construction method for an anti-scouring structure applicable to high-flow scouring protection of the bank slope of overlying strata, characterized in that: Construct a kind of anti-scouring structure for high-velocity scouring and covering layer slope applicable to any one of claims 1-7, and the specific steps are as follows: S1: Backfill the ground layer (1) by river with stone slag to form the base (2), and throw large stones on the water-facing surface of the base (2) to form the slope protection (3). S2: Pour the top plate (4) and reserve a notch for the construction of the anti-scouring wall structure (5) and the support pier (6). S3: Carry out the excavation construction of the slot hole (21) on the platform of the poured top plate (4). At the same time, connect the top plate (4) with the concrete at the notch position to the steel bars of the anti-scouring wall structure (5) and the support pier (6), and pour the anti-scouring wall structure (5) and the support pier (6) accordingly. S4: Construct the backfill and pouring part (41) of the notch of the top plate (4), and connect the top plate (4) with the anti-scouring wall structure (5) and the support pier (6) to form an integral body.

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