Concrete anti-scour guide wall structure and construction method

Abstract

The present invention relates to a concrete anti-scour guide wall structure and construction method, including a construction platform, a occlusal pile continuous wall is poured on one side of the construction platform away from the river channel, a backfill pit is excavated behind the occlusal pile continuous wall, a plain concrete layer is filled in the backfill pit, an upper guide wall structure concrete layer is poured on the side above the plain concrete layer close to the occlusal pile continuous wall, and a passage is paved in the part of the guide wall structure concrete above the plain concrete layer to the slope surface. Through the occlusal pile continuous wall 4, a temporary cofferdam is no longer needed, and the permanent and temporary combination of the concrete anti-scour guide wall structure and the integration of piles and walls are realized, which saves the construction cost and construction time of the temporary cofferdam, saves the construction period, reduces the flood risk during the construction period, and reduces soil erosion.

Description

Technical Field

[0001] The invention belongs to the technical field of anti-scour guide walls in water conservancy and hydropower engineering, and in particular relates to a concrete anti-scour guide wall structure and a construction method. Background Art

[0002] The anti-scouring guide wall structure of water conservancy and hydropower projects, such as diversion, flood discharge structure outlets, river bank protection, etc., mostly adopts cast-in-place concrete guide wall type. In order to meet its anti-scouring function, the guide wall is required to be built on bedrock and a tooth groove structure is set at the same time. In order to facilitate the construction of concrete guide walls, cofferdams are generally used to protect foundation pits, and earth-rock cofferdams also need to be treated for anti-seepage to form dry land construction conditions. For rivers with thick covering layers and narrow river channels, if earth-rock cofferdams are used, there are problems such as large channel narrowness, large cofferdam protection and anti-seepage engineering, deep foundation pits, difficult pumping, and long construction periods. Therefore, it is necessary to provide a new type of anti-scouring guide wall structure to simplify construction, shorten construction period, and at the same time ensure anti-scouring and retaining effects. Summary of the invention

[0003] The purpose of the present invention is to provide a concrete anti-scour guide wall structure and construction method to solve the problems in the prior art that the use of cofferdam filling will narrow the river channel, and the cofferdam protection and anti-seepage engineering volume is large, the construction period is long, and the process is complicated.

[0004] The objective of the present invention is achieved through the following technical means: a concrete anti-collision guide wall structure, comprising a construction platform, a continuous wall of interlocking piles is poured on the side of the construction platform away from the river channel, a backfill pit is excavated behind the continuous wall of the interlocking piles, the backfill pit is filled with a plain concrete layer, an upper guide wall structure concrete layer is cast on the side above the plain concrete layer close to the continuous wall of the interlocking piles, and a passage is paved in the part of the guide wall structure concrete above the plain concrete layer to the slope surface.

[0005] The interlocking pile continuous wall comprises a first-order concrete pile and a second-order reinforced concrete pile interlocking with each other.

[0006] The diameters of the first-order concrete piles and the second-order reinforced concrete piles are both 0.6m-2.0m, the lengths of the first-order concrete piles and the second-order reinforced concrete piles are both 10m-30m, and the diameter of the second-order reinforced concrete piles is smaller than that of the first-order concrete piles.

[0007] The plain concrete layer is 3m-5m lower than the top of the interlocking pile continuous wall.

[0008] A reinforced concrete continuous beam is also cast on the top of the interlocking pile continuous wall, and the height of the reinforced concrete continuous beam is 0.5m-1.5m.

[0009] The interlocking pile continuous wall is U-shaped as a whole, and the opening direction of the interlocking pile continuous wall is opposite to the direction of the river channel.

[0010] A construction method of a concrete anti-scour guide wall structure comprises the following steps: a first step of leveling a construction platform, firstly filling or excavating the slopes on both sides of a river channel to level the construction platform;

[0011] The second step is the construction of the interlocking pile continuous wall. The interlocking pile holes are constructed on the side of the construction platform away from the river channel. The first-order concrete piles are poured into the interlocking pile holes. Then the second-order reinforced concrete piles are constructed. The first-order concrete piles and the second-order reinforced concrete piles form a closed interlocking pile continuous wall.

[0012] The third step is to construct the reinforced concrete continuous beam, chisel out the pile head of the interlocking pile continuous wall, and construct the reinforced concrete continuous beam on the pile top of the removed interlocking pile continuous wall;

[0013] The fourth step is to backfill the pit and excavate the slag, sand, gravel, silt, etc. behind the wall to the bedrock;

[0014] The fifth step is backfilling the plain concrete layer. The plain concrete layer is backfilled into the backfill pit. The height of the plain concrete layer is lower than the top of the concrete continuous beam.

[0015] The sixth step is the construction of the upper guide wall structure concrete layer and the access road. The upper guide wall structure concrete layer is poured above the plain concrete layer on one side of the interlocking pile continuous wall, and the upper guide wall structure concrete layer above the plain concrete layer is backfilled into the empty space formed by the slope to form a access road.

[0016] In the second step, the bottom of the interlocking pile continuous wall pit is dug below the bedrock, and the bottoms of the first-order concrete piles and the second-order reinforced concrete piles are located in the bedrock.

[0017] Both ends of the interlocking pile continuous wall are bent toward the backfill pit direction, and the bent parts are connected with adjacent hydraulic structures or bank slopes to form a closed enclosure structure. The interlocking pile continuous wall is U-shaped.

[0018] The portion of the first-order concrete pile that does not overlap with the second-order reinforced concrete pile is also connected with an I-beam.

[0019] The beneficial effects of the present invention are as follows: 1. The temporary cofferdam is replaced by the interlocking pile continuous wall, which not only creates dry land construction conditions behind the wall during construction, but also avoids the investment problem of dismantling the temporary cofferdam, reduces soil erosion, and solves the problem of building anti-scouring guide walls in narrow river channels and river channels with thick covering layers.

[0020] 2. The U-shaped interlocking pile continuous wall can ensure that the entire interlocking pile continuous wall is built on the bedrock, reducing the construction period. At the same time, the U-shaped closed structure built on the bedrock reduces the risk of water intrusion into the foundation pit during the guide wall construction.

[0021] 3. The interlocking pile wall can use methods such as impact drilling to ensure the depth of the pile into the rock and ensure the anti-impact effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic cross-sectional view of the structure of the present invention;

[0023] Figure 2 It is a plan view of the occlusal pile structure;

[0024] Figure 3 This is a schematic diagram of the L-shaped interlocking pile continuous wall;

[0025] Figure 4 This is a schematic diagram of the U-shaped interlocking pile continuous wall;

[0026] In the figure, 1.1, construction platform; 2. First-order concrete piles; 3. Second-order reinforced concrete piles; 4. Interlocking pile continuous wall; 5. Reinforced concrete continuous beam; 6. Bedrock top plate line; 7. Plain concrete layer; 8. Upper guide wall concrete layer; 9. Access road; 10. Adjacent hydraulic structures; 11. I-beam.

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; DETAILED DESCRIPTION

[0028] [Example 1]

[0029] like Figures 1 to 4 As shown, a concrete anti-scour guide wall structure includes a construction platform 1, a continuous wall 4 of interlocking piles is poured on the side of the construction platform 1 away from the river channel, a backfill pit is excavated behind the continuous wall 4 of the interlocking piles, and the backfill pit is filled with a plain concrete layer 7, an upper guide wall structure concrete layer 8 is poured on the side above the plain concrete layer 7 close to the continuous wall 4 of the interlocking piles, and a passage 9 is paved in the part of the guide wall structure concrete 8 above the plain concrete layer 7 to the slope surface. The side of the construction platform 1 away from the river channel is drilled to below the bedrock top plate line 6 by means of impact drilling or the like, and then the continuous wall 4 of the interlocking piles is poured therein as a separation wall, the bottom layer of the backfill pit behind the wall is the plain concrete layer 7, and the upper guide wall structure concrete layer 8 and the passage 9 are above the plain concrete layer 7, wherein the upper guide wall structure concrete layer 8 is close to the continuous wall 4 of the interlocking piles.

[0030] like Figure 2 As shown, the interlocking pile continuous wall 4 includes a first-order concrete pile 2 and a second-order reinforced concrete pile 3 that interlock with each other. The interlocking pile continuous wall 4 includes a first-order concrete pile 2 and a second-order reinforced concrete pile 3. During construction, the first-order concrete pile 2 is constructed first, and then the second-order reinforced concrete pile 3 is constructed next to it. When constructing the second-order reinforced concrete pile 3, a part of the first-order concrete pile 2 will be destroyed, thereby achieving interlocking.

[0031] The diameters of the first-order concrete piles 2 and the second-order reinforced concrete piles 3 are both 0.6m-2.0m, and the lengths of the first-order concrete piles 2 and the second-order reinforced concrete piles 3 are both 10m-30m, and the diameter of the second-order reinforced concrete piles 3 is smaller than the diameter of the first-order concrete piles 2. The first-order concrete piles 2 and the second-order reinforced concrete piles 3 extend 3m-10m below the bedrock top plate line 6 to improve the anti-collision effect.

[0032] The plain concrete layer 7 is 3m-5m lower than the top of the interlocking pile continuous wall 4. The top of the plain concrete layer 7 is 3m-5m lower than the top of the interlocking pile continuous wall 4.

[0033] A reinforced concrete continuous beam 5 is also cast on the top of the interlocking pile continuous wall 4, and the reinforced concrete continuous beam 5 is 0.5m-1.5m high.

[0034] like Figure 4 As shown, the interlocking pile continuous wall 4 is U-shaped as a whole, and the opening direction of the interlocking pile continuous wall 4 is opposite to the river channel. The side walls of the interlocking pile continuous wall 4 are nearly parallel to the river channel, and the two ends of the side walls extend backward, that is, away from the river channel. The extended part extends 1m below the bedrock top plate line 6, thus forming a closed enclosure structure. The U-shaped opening is opposite to the river channel to prevent water from entering the two sides of the backfill pit. If the interlocking pile continuous wall 4 is connected to the adjacent hydraulic structure 10 upstream or connected to the bank slope rock downstream, the corresponding upstream end extension or downstream end extension can be omitted.

[0035] [Example 2]

[0036] like Figures 1 to 4 As shown, a construction method of a concrete anti-scour guide wall structure includes the following steps. In the first step, the construction platform 1 is leveled. The slope on one side of the river channel is first filled or excavated to be leveled as the construction platform 1; the slope beside the river channel is first filled or excavated to be the construction platform 1 with an upper plane width of 5-8m, so that subsequent mechanical equipment can work on the construction platform 1.

[0037] The second step is the construction of the interlocking pile continuous wall 4. Interlocking pile holes are constructed on the side of the construction platform 1 away from the river channel. First-order concrete piles 2 are poured into the interlocking pile holes. Then, second-order reinforced concrete piles 3 are constructed. The first-order concrete piles 2 and the second-order reinforced concrete piles 3 form a closed interlocking pile continuous wall 4. The interlocking pile holes are constructed by methods such as impact drilling.

[0038] In the second step, the bottom of the interlocking pile hole extends below the bedrock top line 6 , and the bottoms of the first-order concrete pile 2 and the second-order reinforced concrete pile 3 are located below the bedrock top line 6 .

[0039] Then, dig a continuous wall pit of interlocking piles behind the construction platform 1 and dig it below the bedrock top plate line 6. Then, use the cast-in-place pile process to construct the first-order concrete piles 2 and the second-order reinforced concrete piles 3 to form a closed continuous wall of interlocking piles 4. In this way, the bottom of the continuous wall of interlocking piles 4 also extends into the bedrock. The first-order concrete piles 2 and the second-order reinforced concrete piles 3 are 10m to 30m long and 3m to 10m deep in the rock. The depth of the interlocking piles in the upstream 5m range needs to be deepened by 3m to 5m to improve the anti-collision effect. The minimum thickness of the continuous wall of interlocking piles 4 is 0.5m to 1.5m.

[0040] The third step is to construct the reinforced concrete continuous beam 5. The pile heads of the interlocking pile continuous wall 4 are chiseled out, and the reinforced concrete continuous beam 5 is constructed on the pile tops of the interlocking pile continuous wall 4; the pile heads of the interlocking piles are chiseled out, and the reinforced concrete continuous beam 5 is constructed on the top of the interlocking pile continuous wall 4. The width of the concrete continuous beam 5 is 0.6m~2m, and the height is 0.5m~1.5m.

[0041] The fourth step is to backfill the pit and dig out the slag, gravel, silt, etc. behind the wall to the bedrock top line 6; at this time, the interlocking pile continuous wall 4 has been completed, and the dry land state is achieved behind the wall. At this time, the slag, gravel, silt, etc. behind the wall are dug out manually or mechanically to the bedrock or the designed foundation depth.

[0042] Step 5: backfilling the plain concrete layer 7. Backfilling the plain concrete layer 7 into the backfill pit. The height of the plain concrete layer 7 is lower than the top of the concrete continuous beam 5.

[0043] After cleaning and roughening the pile body of the interlocking pile continuous wall 4, a plain concrete layer 7 is poured into the backfill pit. The bottom width of the plain concrete layer 7 is 3m to 5m, the top elevation is 2m to 5m lower than the interlocking pile continuous wall, the top width is 5m to 15m, and the height is 5m to 15m. In order to increase the integration with the upper structure and improve the stress state of the upper guide wall structure, dowel bars can also be pre-embedded on the upper part of the plain concrete layer 7.

[0044] The sixth step is the construction of the upper guide wall structure concrete layer 8 and the access road 9. The upper guide wall structure concrete layer 8 is poured on the side of the plain concrete layer 7 close to the interlocking pile continuous wall 4, and the upper guide wall structure concrete layer 8 above the plain concrete layer 7 is backfilled into the empty space formed by the slope to form the access road 9.

[0045] Roughen the plain concrete layer 7 and the concrete continuous beam 5, and cast the upper guide wall structure concrete layer 8 on the side of the plain concrete layer 7 close to the concrete continuous beam 5 and the interlocking pile continuous wall 4. The upper guide wall structure concrete layer 8 has a bottom width of 2m to 7m, a height of 5m to 15m, and a top width of 2m to 3m. Figure 1 As shown, the upper guide wall structure concrete layer 8 only occupies a part of the plain concrete layer 7, and the other part is backfilled with slag, gravel and other materials to form a passage 9.

[0046] like Figure 3 and Figure 4 As shown, both ends of the interlocking pile continuous wall 4 are bent toward the backfill pit direction, and the bent portion is connected to the adjacent hydraulic structure 10 or the bank slope to form a closed enclosure structure. The interlocking pile continuous wall 4 is U-shaped.

[0047] The two ends of the interlocking pile continuous wall 4 are bent toward the backfill pit direction to form a U shape, and the bottoms of the two bent sides also extend below the bedrock top plate line 6 to form a closed enclosure structure.

[0048] like Figure 2 As shown, the portion of the first-order concrete pile 2 that does not overlap with the second-order reinforced concrete pile 3 is also connected with an I-beam 11. During construction, the first-order concrete pile 2 is constructed first, and then the second-order reinforced concrete pile 3 is constructed. When the second-order reinforced concrete pile 3 is constructed, a portion of the first-order concrete pile 2 will be crushed for engagement, and the I-beam is connected to the portion that will not be crushed, so as to improve the strength of the first-order concrete pile 2.

[0049] Through the interlocking pile continuous wall 4, temporary cofferdam is no longer needed, and the permanent and temporary combination of concrete anti-scour guide wall structure and the integration of pile and wall are realized, which saves the construction cost and construction time of temporary cofferdam, saves construction period, reduces flood risk during construction period, and reduces soil erosion.

[0050] The components and structures not described in detail in this embodiment are well-known components and common structures or common means in the industry and are not described one by one here.

Claims

1. A construction method for a concrete anti-collision guide wall structure, characterized in that: The following steps are involved: The first step is to level the construction platform (1). First, the slopes on both sides of the river are filled or excavated to form the construction platform (1). The second step is to construct the interlocking pile continuous wall (4). An interlocking pile hole is constructed on the side of the construction platform (1) away from the river channel. A first-order concrete pile (2) is poured into the interlocking pile hole. Then, a second-order reinforced concrete pile (3) is constructed. The first-order concrete pile (2) and the second-order reinforced concrete pile (3) form a closed interlocking pile continuous wall (4). The third step is to construct the reinforced concrete continuous beam (5), by chiseling off the pile head of the interlocking pile continuous wall (4), and then construct the reinforced concrete continuous beam (5) on the pile top of the interlocking pile continuous wall (4); Step 4: backfill the pit and excavate the slag, gravel, and silt behind the wall to the top line of the bedrock (6); Step 5: backfilling the plain concrete layer (7), backfilling the plain concrete layer (7) into the backfill pit, wherein the height of the plain concrete layer (7) is lower than the top of the reinforced concrete continuous beam (5); The sixth step is to construct the upper guide wall structure concrete layer (8) and the access road (9). The upper guide wall structure concrete layer (8) is poured on the side of the plain concrete layer (7) close to the interlocking pile continuous wall (4), and the upper guide wall structure concrete layer (8) above the plain concrete layer (7) is backfilled to form the access road (9) in the empty space formed by the slope; the construction platform (1) includes a construction platform (1), and the interlocking pile continuous wall (4) is poured on the side of the construction platform (1) away from the river channel, and the interlocking pile continuous wall (4) is excavated behind the interlocking pile continuous wall (4). A backfill pit is filled with a plain concrete layer (7), an upper guide wall structure concrete layer (8) is cast on one side of the plain concrete layer (7) close to the interlocking pile continuous wall (4), and a passageway (9) is paved in the portion from the upper guide wall structure concrete layer (8) of the plain concrete layer (7) to the slope surface, the interlocking pile continuous wall (4) comprises a first-order concrete plain pile (2) and a second-order reinforced concrete pile (3) interlocking with each other, and a reinforced concrete continuous beam (5) is also cast on the top of the interlocking pile continuous wall (4).

2. The construction method of a concrete anti-collision guide wall structure according to claim 1, characterized in that: The diameters of the first-order concrete pile (2) and the second-order reinforced concrete pile (3) are both 0.6m-2.0m, the lengths of the first-order concrete pile (2) and the second-order reinforced concrete pile (3) are both 10m-30m, and the diameter of the second-order reinforced concrete pile (3) is smaller than that of the first-order concrete pile (2).

3. The construction method of a concrete anti-collision guide wall structure according to claim 1, characterized in that: The plain concrete layer (7) is 3m-5m below the top of the interlocking pile continuous wall (4).

4. The construction method of a concrete anti-collision guide wall structure according to claim 1, characterized in that: The reinforced concrete continuous beam (5) is 0.5m-1.5m high.

5. The construction method of a concrete anti-collision guide wall structure according to claim 1, characterized in that: The interlocking pile continuous wall (4) is U-shaped as a whole, and the opening direction of the interlocking pile continuous wall (4) is opposite to the direction of the river channel.

6. The construction method of a concrete anti-collision guide wall structure according to claim 1, characterized in that: In the second step, the bottom of the interlocking pile hole extends below the bedrock top plate line (6), and the bottoms of the first-order concrete pile (2) and the second-order reinforced concrete pile (3) are located below the bedrock top plate line (6).

7. The construction method of a concrete anti-collision guide wall structure according to claim 1, characterized in that: Both ends of the interlocking pile continuous wall (4) are bent in the direction of the backfill pit, and the bent parts are connected to adjacent hydraulic structures (10) or bank slopes to form a closed enclosure structure. The interlocking pile continuous wall (4) is U-shaped.

8. The construction method of a concrete anti-collision guide wall structure according to claim 1, characterized in that: The portion of the first-order concrete pile (2) that does not overlap with the second-order reinforced concrete pile (3) is also connected to an I-beam (11).

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