Bank protection cofferdam structure

Abstract

The bank protection cofferdam structure comprises a first pile row and a second pile row which are arranged in parallel, the first pile row and the second pile row are driven in soil, the upper end of the first pile row and the upper end of the second pile row are connected through an opposite-pulling mechanism, a first bamboo raft sheet layer and an anti-seepage geomembrane are arranged on the inner side of the first pile row, and a second bamboo raft sheet layer and an anti-seepage geomembrane are arranged on the inner side of the second pile row. A second bamboo raft piece layer and geotechnical cloth are arranged on the inner side of the second pile row, backfill soil is arranged between the first pile row and the second pile row, and bagged soil is evenly laid on the top of the backfill soil. The anti-seepage performance and the stability of the revetment cofferdam structure can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of engineering, and in particular relates to a bank protection cofferdam structure. Background Art

[0002] A cofferdam refers to a temporary retaining structure built during the construction of a water conservancy project to build permanent water conservancy facilities.

[0003] In the prior art, a Chinese utility model patent document with authorization announcement number CN219690563U discloses an environmentally friendly ecological cofferdam, in which a bead curtain sheet and a geotextile are respectively provided on the inner sides of a first row of wooden piles and a second row of wooden piles to enhance the strength of the cofferdam. However, the bead curtain sheet and the geotextile have poor water-proof performance, and the river water on the side close to the river channel can easily penetrate into the interior of the cofferdam, thereby affecting the stability of the cofferdam.

[0004] Therefore, it is necessary to design a bank protection cofferdam structure that improves the anti-seepage performance and cofferdam stability to solve the current technical problems. Summary of the invention

[0005] In view of the shortcomings of the prior art, the utility model provides a bank protection cofferdam structure that improves the anti-seepage performance and cofferdam stability.

[0006] The technical solution of the utility model is: a bank protection cofferdam structure, comprising a first pile row and a second pile row arranged in parallel, the first pile row and the second pile row are driven into the soil, the upper ends of the first pile row and the second pile row are connected by a pulling mechanism, a first bamboo raft layer and an impermeable geomembrane are arranged on the inner side of the first pile row, a second bamboo raft layer and a geotextile are arranged on the inner side of the second pile row, backfill soil is arranged between the first pile row and the second pile row, and bagged soil is evenly laid on the top of the backfill soil.

[0007] The tension mechanism comprises purlins arranged outside the first pile row and the second pile row, and tension rods are connected between the purlins, and locking components are arranged at the ends of the tension rods.

[0008] The pull rod is a screw rod with a diameter of 20 mm, a through hole matching the pull rod is provided on the surrounding purlin, and the locking component is a nut matching the screw rod.

[0009] An earth shoring platform is provided on the side of the second pile row away from the backfill soil, the width of the earth shoring platform is 2m, and the slope ratio of the earth shoring platform is 1:2.

[0010] The first pile row and the second pile row both have wooden piles with an injection interval of 60 cm, the length of the wooden piles is 6 m, the tip diameter of the wooden piles is 14 cm, and the depth of the wooden piles buried in the soil is 3.3-3.5 m.

[0011] The first row of piles has steel pipe piles with a driving interval of 80 cm, the length of the steel pipe piles is 9 m, the pile diameter of the steel pipe piles is 273 mm, and the penetration depth of the steel pipe piles is not less than 5.3 - 5.5 m; the second row of piles has wooden piles with a driving interval of 60 cm, the length of the wooden piles is 6 m, the top diameter of the wooden piles is 14 cm, and the penetration depth of the wooden piles is 2.3 - 2.5 m.

[0012] The backfill soil is cohesive soil.

[0013] The laying thickness of the bagged soil is 30 - 50 cm.

[0014] The bottom end of the anti-seepage geomembrane has a first bending part, and the first bending part is arranged at the bottom of the backfill soil.

[0015] The bottom end of the geotextile has a second bending part, and the second bending part is arranged at the bottom of the backfill soil.

[0016] The beneficial effects of the present utility model:

[0017] (1) In the present utility model, the main body of the bank protection cofferdam structure is formed by the first row of piles, the second row of piles, and the backfill soil filled between the first row of piles and the second row of piles. Among them, the first row of piles is close to the river water. By arranging a first bamboo raft layer and an anti-seepage geomembrane inside the first row of piles, the anti-seepage geomembrane can effectively cut off the seepage channel, thereby reducing the water seepage, improving the anti-seepage performance at the first row of piles, and enhancing the stability of the cofferdam;

[0018] (2) A second bamboo raft layer and a geotextile are arranged inside the second row of piles. The geotextile can play an isolation role, isolate different material layers from each other, prevent them from being mixed, maintain the structure and performance of the overall materials, and the geotextile has good water conduction performance and can be used as a lateral drainage channel between the backfill soil and the foundation soil to accelerate consolidation, thereby reducing the instability of the soil body caused by water accumulation;

[0019] (3) By arranging bagged soil on the top of the backfill soil, it can effectively prevent water and soil from entering the construction area, thereby ensuring the dryness and cleanliness within the construction area. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of an implementation manner of the bank protection cofferdam structure in the present utility model.

[0021] Figure 2 It is a schematic structural diagram of another implementation manner of the bank protection cofferdam structure in the present utility model. Detailed Embodiment

[0022] Various exemplary embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is not intended to limit the present utility model or its application or use. The present utility model can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present utility model thorough and complete and to fully convey the scope of the present utility model to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, the compositions of materials, numerical expressions, and numerical values set forth in these embodiments should be construed as merely exemplary and not as limitations.

[0023] The "first", "second", and similar terms used in the present utility model do not denote any order, quantity, or importance, but are merely used to distinguish different parts. Terms such as "comprising" or "including" mean that the elements before the term cover the elements listed after the term and do not exclude the possibility of also covering other elements. Terms such as "upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0024] As Figure 1 and 2 shown, the revetment cofferdam structure includes a first row of piles 1 and a second row of piles 2 arranged in parallel. The first row of piles 1 and the second row of piles 2 are driven into the soil. The upper ends of the first row of piles 1 and the second row of piles 2 are connected by a tie rod mechanism 8. A first bamboo raft layer 3 and an anti-seepage geomembrane 5 are arranged inside the first row of piles 1. A second bamboo raft layer 6 and a geotextile 4 are arranged inside the second row of piles 2. Backfill soil 7 is arranged between the first row of piles 1 and the second row of piles 2. The top of the backfill soil 7 is evenly paved with bagged soil 71. In this embodiment, the main body of the revetment cofferdam structure is formed by the first row of piles 1, the second row of piles 2, and the backfill soil 7 filled between the first row of piles 1 and the second row of piles 2. Among them, the first row of piles 1 is close to the river. By arranging a first bamboo raft layer 3 and an anti-seepage geomembrane 5 inside the first row of piles 1, the anti-seepage geomembrane 5 can effectively cut off the seepage channel, thereby reducing water seepage, improving the anti-seepage performance at the first row of piles 1, and enhancing the stability of the cofferdam. A second bamboo raft layer 6 and a geotextile 4 are arranged inside the second row of piles 2. The geotextile 4 can play an isolation role, isolating different material layers from each other, preventing them from being mixed, maintaining the structure and performance of the overall material. The geotextile 4 has good water conduction performance and can serve as a lateral drainage channel between the backfill soil and the foundation soil to accelerate consolidation, thereby reducing the instability of the soil caused by water accumulation. By arranging bagged soil 71 on the top of the backfill soil 7, water and soil can be effectively prevented from entering the construction area, thereby ensuring the dryness and cleanliness within the construction area.

[0025] In some embodiments, the tie-back mechanism 8 has a waling 82 disposed outside the first row of piles 1 and the second row of piles 2. A tie bar 81 is connected between the waling 82. A locking member 83 is provided at the end of the tie bar 81. The locking member 83 locks at the end of the tie bar 81, so that the waling 82 is tightly pressed and fixed on the outer sides of the upper ends of the first row of piles 1 and the second row of piles 2, and tensioning and fixing is performed between the tops of the first row of piles 1 and the second row of piles 2.

[0026] In some embodiments, as a more specific implementation manner of the tie-back mechanism 8, the tie bar 81 is a screw rod with a diameter of 20 mm. Through holes matching the tie bar 81 are formed in the waling 82. The locking member 83 is a nut matching the screw rod. The end of the screw rod passes through the through hole to observe the waling 82, and a nut is assembled on the screw rod outside the waling 82 to lock and fix the waling 82 between the first row of piles 1 and the second row of piles 2.

[0027] In some embodiments, an earth berm 9 is provided on the side of the second row of piles 2 away from the backfill soil 7. The earth berm 9 is provided on the water-retaining side of the cofferdam structure. The earth berm can provide additional support and protection for the cofferdam structure, and improve the stability and safety of the cofferdam structure; specifically, the width of the earth berm 9 is 2 m, and the slope ratio of the earth berm 9 is 1:2.

[0028] In some embodiments, as a specific implementation manner of the first row of piles 1 and the second row of piles 2, both the first row of piles 1 and the second row of piles 2 have wooden piles with a driving interval of 60 cm. The length of the wooden piles is 6 m, the top diameter of the wooden piles is 14 cm, and the penetration depth of the wooden piles into the soil is 3.3 - 3.5 m. The first row of piles 1 and the second row of piles 2 composed of wooden piles are lighter in weight, which is convenient for transportation and construction.

[0029] In some embodiments, as another specific implementation manner of the first row of piles 1 and the second row of piles 2, the first row of piles 1 has steel pipe piles with a driving interval of 80 cm. The length of the steel pipe piles is 9 m, the pile diameter of the steel pipe piles is 273 mm, and the penetration depth of the steel pipe piles into the soil is not less than 5.3 - 5.5 m. The steel pipe piles are arranged on the side close to the river water, and the steel pipe piles have high strength; the second row of piles 2 has wooden piles with a driving interval of 60 cm. The length of the wooden piles is 6 m, the top diameter of the wooden piles is 14 cm, and the penetration depth of the wooden piles into the soil is 2.3 - 2.5 m.

[0030] In some embodiments, the backfill soil 7 is cohesive soil, which can further improve the water seepage prevention performance of the revetment cofferdam structure.

[0031] In some embodiments, the laying thickness of the bagged soil 71 is 30 - 50 cm.

[0032] In some embodiments, the bottom end of the impermeable geomembrane 5 has a first bending portion 51, and the first bending portion 51 is arranged at the bottom of the backfill soil 71. By extending the first bending portion 51 at the inner bottom of the backfill soil 7, the seepage path can be extended, and the anti-seepage effect can be improved.

[0033] In some embodiments, the bottom end of the geotextile 4 has a second bending portion 41, and the second bending portion 41 is arranged at the bottom of the backfill soil 7.

[0034] So far, the embodiments of the present invention have been described in detail. In order to avoid obscuring the concept of the present invention, some details well known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0035] The above-described embodiments only represent some implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the utility model patent shall be subject to the appended claims.

Claims

1. A bank protection cofferdam structure, characterized in that: It comprises a first pile row and a second pile row which are arranged in parallel, wherein the first pile row and the second pile row are driven into the soil, the upper ends of the first pile row and the second pile row are connected by a pulling mechanism, a first bamboo raft sheet layer and an impermeable geomembrane are arranged on the inner side of the first pile row, a second bamboo raft sheet layer and a geotextile are arranged on the inner side of the second pile row, backfill soil is arranged between the first pile row and the second pile row, and bagged soil is evenly laid on the top of the backfill soil.

2. The bank protection cofferdam structure according to claim 1 is characterized in that: The tension mechanism comprises purlins arranged outside the first pile row and the second pile row, and tension rods are connected between the purlins, and locking components are arranged at the ends of the tension rods.

3. The bank protection cofferdam structure according to claim 2 is characterized in that: The pull rod is a screw rod with a diameter of 20 mm, a through hole matching the pull rod is provided on the surrounding purlin, and the locking component is a nut matching the screw rod.

4. The bank protection cofferdam structure according to claim 1 is characterized in that: An earth shoring platform is provided on the side of the second pile row away from the backfill soil, the width of the earth shoring platform is 2m, and the slope ratio of the earth shoring platform is 1:

2.

5. The bank protection cofferdam structure according to claim 1 is characterized in that: The first pile row and the second pile row both have wooden piles with an injection interval of 60 cm, the length of the wooden piles is 6 m, the tip diameter of the wooden piles is 14 cm, and the depth of the wooden piles buried in the soil is 3.3-3.5 m.

6. The bank protection cofferdam structure according to claim 1 is characterized in that: The first pile row has steel pipe piles with an injection interval of 80 cm, the length of the steel pipe piles is 9 m, the pile diameter of the steel pipe piles is 273 mm, and the depth of the steel pipe piles into the soil is not less than 5.3-5.5 m; The second pile row has wooden piles with an injection interval of 60 cm, the length of the wooden piles is 6 m, the tip diameter of the wooden piles is 14 cm, and the depth of the wooden piles buried in the soil is 2.3 to 2.5 m.

7. The bank protection cofferdam structure according to claim 1 is characterized in that: The backfill soil is clay soil.

8. The bank protection cofferdam structure according to claim 1 is characterized in that: The laying thickness of the bagged soil is 30 to 50 cm.

9. The bank protection cofferdam structure according to claim 1, characterized in that: The bottom end of the anti-seepage geomembrane has a first bending portion, and the first bending portion is arranged at the bottom of the backfill soil.

10. The bank protection cofferdam structure according to claim 1, characterized in that: The bottom end of the geotextile is provided with a second bending portion, and the second bending portion is arranged at the bottom of the backfill soil.

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