Double-row steel sheet pile cofferdam structure

Abstract

The utility model relates to the technical field of cofferdams, and discloses a double-row steel sheet pile cofferdam structure which comprises a cofferdam body connected to a foundation and an internal supporting body connected to the interior of the cofferdam body, two wave walls are arranged at the top of the internal supporting body, a flood prevention channel is arranged between the two wave walls, and the flood prevention channel is communicated with the cofferdam body. The side, away from the flood prevention channel, of one wave wall is connected with a concrete protection slope, and the side, away from the flood prevention channel, of the other wave wall is connected with a gravel protection slope. According to the double-row steel sheet pile cofferdam structure, the cofferdam body and the internal supporting body are arranged, the multiple first laminations and the multiple second laminations which are alternately stacked are arranged between the two U-shaped steel sheet piles of the cofferdam body, and the multiple short sand bags of the first laminations and the long sand bags of the second laminations are stacked in a crossed mode, so that the overall stability of a soil body in the cofferdam is improved; the lateral soil pressure of the internal soil body on the steel sheet piles is reduced, the overall stability is improved, and deformation of the steel sheet pile cofferdam is avoided.

Description

Technical Field

[0001] This utility model relates to the field of cofferdam technology, specifically a double-row steel sheet pile cofferdam structure. Background Technology

[0002] Sheet pile cofferdams are the most commonly used type of sheet pile cofferdam. Their advantages include high strength and ease of driving into hard soil layers; they can be constructed in deep water, and if necessary, they can be reinforced with diagonal supports to form a cage, providing good waterproof performance; they can be assembled into cofferdams of various shapes as needed and can be reused multiple times, thus making them widely applicable.

[0003] Double-row sheet piles offer flexible layout and convenient construction, making them widely used in cofferdams, foundation pits, and sidewall engineering. In many large-scale cofferdam projects, such as dock cofferdams and river dredging projects, double-row sheet piles are quite long, and their internal structure is often rapidly formed by filling nearby dredged soil or silt. This brings many construction problems. Due to the poor integrity of dredged soil and silt, which is similar to fluid soil, it exerts significant lateral pressure on the sheet pile cofferdam, often causing it to bulge and deform greatly. In severe cases, the walers may detach, leading to the cofferdam's collapse. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a double-row steel sheet pile cofferdam structure, which solves the problems mentioned in the background.

[0005] This utility model provides the following technical solution: a double-row steel sheet pile cofferdam structure, comprising: a cofferdam body connected to the foundation and an internal support body connected inside the cofferdam body, wherein two wave walls are provided on the top of the internal support body, and a flood control channel is provided between the two wave walls, wherein a concrete slope is connected to the side of one of the wave walls away from the flood control channel, and a gravel slope is connected to the side of the other wave wall away from the flood control channel;

[0006] The main body of the cofferdam includes two U-shaped steel sheet piles inserted into the original mud surface of the foundation, and multiple parallel steel tie rods are installed between the two U-shaped steel sheet piles;

[0007] The internal support structure comprises multiple alternating layers of first and second stacks, all located between two U-shaped sheet piles.

[0008] Preferably, each first stack includes a plurality of short sandbags arranged in parallel with each other, and each second stack includes a plurality of long sandbags arranged in parallel with each other, wherein the long sandbags and the short sandbags are arranged perpendicular to each other.

[0009] Preferably, the short sandbag has a length of 15-20m and a width of 0.8m, the long sandbag has a length of 60-120m and a width of 2m, and the overlap length between the long sandbag and the U-shaped steel sheet pile is ≥1.2m.

[0010] Preferably, the length of the U-shaped steel sheet pile inserted into the original mud surface of the foundation is 1.5-2 times the length of the U-shaped steel sheet pile outside the original mud surface of the foundation;

[0011] The steel tie rod has a diameter of 70mm, and the distance between two adjacent steel tie rods is 2400mm.

[0012] Preferably, the flood control channel includes a first crushed stone cushion layer, a cement-stabilized crushed stone layer connected to the top of the first crushed stone cushion layer, and a first concrete surface layer connected to the top of the cement-stabilized crushed stone layer.

[0013] Preferably, the thickness of the first crushed stone cushion layer is 150mm, the thickness of the cement-stabilized crushed stone layer is 250mm, and the thickness of the first concrete surface layer is 260mm.

[0014] Preferably, the concrete slope protection includes a second crushed stone cushion layer, on which a second concrete surface layer is connected, the thickness of which is 100mm.

[0015] Preferably, the vertical height of the concrete slope protection is 1 / 4 of the base width, and the vertical height of the crushed stone slope protection is 1 / 4 of the base width.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. This double-row steel sheet pile cofferdam structure, by setting up a cofferdam main body and an internal support body, sets up multiple alternating first layers and multiple second layers between the two U-shaped steel sheet piles of the cofferdam main body. Multiple short sandbags of the first layer and long sandbags of the second layer are stacked in a cross shape, which improves the overall stability of the soil inside the cofferdam, reduces the lateral soil pressure of the internal soil on the steel sheet piles, improves the overall stability, and avoids deformation of the steel sheet pile cofferdam.

[0018] 2. This double-row steel sheet pile cofferdam structure features a wave wall and flood control channel at the top, with a flood control channel laid between the wave walls on both sides. The flood control channel consists of three layers: a first crushed stone cushion layer, a cement-stabilized crushed stone layer, and a first concrete surface layer, to ensure its stability and strength. It is used as a temporary inspection road surface during construction, increasing the temporary construction function of the large cofferdam and providing more convenient conditions for construction. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the first stack and multiple second stack structures of this utility model.

[0021] In the diagram: 101, U-shaped steel sheet pile; 102, steel tie rod; 201, first layer; 2011, short sandbag; 202, second layer; 2021, long sandbag; 3, wave wall; 4, flood control channel; 401, first crushed stone cushion layer; 402, cement-stabilized crushed stone layer; 403, first concrete surface layer; 5, concrete slope protection; 501, second crushed stone cushion layer; 502, second concrete surface layer; 6, crushed stone slope protection. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-2 A double-row steel sheet pile cofferdam structure includes: a cofferdam body connected to the foundation and an internal support body connected inside the cofferdam body. The top of the internal support body is provided with two wave walls 3, and a flood control channel 4 is provided between the two wave walls 3. One of the wave walls 3 is connected to a concrete slope protection 5 on the side away from the flood control channel 4, and the other wave wall 3 is connected to a gravel slope protection 6 on the side away from the flood control channel 4.

[0024] The main body of the cofferdam includes two U-shaped steel sheet piles 101 inserted into the original mud surface of the foundation, and multiple parallel steel tie rods 102 are installed between the two U-shaped steel sheet piles 101.

[0025] The internal support structure includes multiple alternating layers of first stacks 201 and multiple layers of second stacks 202, all of which are located between two U-shaped sheet piles 101.

[0026] Each first stack 201 includes a plurality of short sandbags 2011 arranged in parallel with each other, and each second stack 202 includes a plurality of long sandbags 2021 arranged in parallel with each other, the long sandbags 2021 and the short sandbags 2011 being arranged perpendicular to each other.

[0027] The length of the short sandbag 2011 is 15-20m and the width of the short sandbag 2011 is 0.8m. The length of the long sandbag 2021 is 60-120m and the width of the long sandbag 2021 is 2m. The overlap length between the long sandbag 2021 and the U-shaped steel sheet pile 101 is ≥1.2m.

[0028] The length of the U-shaped steel sheet pile 101 inserted into the original mud surface of the foundation is 1.5-2 times the length of the U-shaped steel sheet pile 101 outside the original mud surface of the foundation;

[0029] The diameter of the steel tie rod 102 is 70mm, and the distance between two adjacent steel tie rods 102 is 2400mm.

[0030] The flood control channel 4 includes a first crushed stone cushion layer 401, a cement-stabilized crushed stone layer 402 connected to the top of the first crushed stone cushion layer 401, and a first concrete surface layer 403 connected to the top of the cement-stabilized crushed stone layer 402.

[0031] The thickness of the first crushed stone cushion layer 401 is 150mm, the thickness of the cement-stabilized crushed stone layer 402 is 250mm, and the thickness of the first concrete surface layer 403 is 260mm.

[0032] The concrete slope protection 5 includes a second crushed stone cushion layer 501, on which a second concrete surface layer 502 is connected, and the thickness of the second concrete surface layer 502 is 100mm.

[0033] The vertical height of the concrete slope protection 5 is 1 / 4 of the base width, and the vertical height of the crushed stone slope protection 6 is 1 / 4 of the base width.

[0034] Two U-shaped steel sheet piles 101 on the water-facing side and the inner side are inserted below the original mud surface of the foundation. Multiple steel tie rods 102 are installed between the two U-shaped steel sheet piles 101 to form the main structure of the cofferdam. Inside the main body of the cofferdam, the first layer 201 and the second layer 202 are stacked. Long sandbags 2021 and short sandbags 2011 are arranged perpendicularly to each other in a cross shape and stacked until the design elevation is reached to form a more integrated internal support. After the long sandbags 2021 and short sandbags 2011 inside the main body of the cofferdam are consolidated and stabilized, a wave wall 3, a concrete slope protection 5, and a gravel slope protection 6 are set up. The concrete slope protection 5 is on the water-facing side of the main body of the cofferdam, and the gravel slope protection 6 is on the inner side of the main body of the cofferdam. A flood control channel 4 is laid between the two wave walls 3. The flood control channel 4 consists of a first gravel cushion layer 401 and a cement-stabilized gravel layer 402 connected to the top of the first gravel cushion layer 401. This ensures its stability and strength and is used as a temporary inspection road surface during construction.

[0035] The internal support structure forms a stronger overall support, reducing the squeezing effect on the inner and outer U-shaped steel sheet piles 1011, reducing the outward deformation of the U-shaped steel sheet piles 1011, and reducing the tension of the steel tie rods 1023, thereby improving the overall stability.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A double-row steel sheet pile cofferdam structure, characterized in that, include: The main body of the cofferdam is connected to the foundation and the internal support body is connected inside the main body of the cofferdam. The top of the internal support body is provided with two wave walls (3) and a flood control channel (4) is provided between the two wave walls (3). One of the wave walls (3) is connected to a concrete slope protection (5) on the side away from the flood control channel (4), and the other wave wall (3) is connected to a crushed stone slope protection (6) on the side away from the flood control channel (4). The main body of the cofferdam includes two U-shaped steel sheet piles (101) inserted into the original mud surface of the foundation, and multiple parallel steel tie rods (102) are installed between the two U-shaped steel sheet piles (101); The internal support structure comprises alternating layers of first stacks (201) and second stacks (202), all of which are located between two U-shaped sheet piles (101).

2. The double-row steel sheet pile cofferdam structure according to claim 1, characterized in that, Each first stack (201) includes a plurality of short sandbags (2011) arranged in parallel with each other, and each second stack (202) includes a plurality of long sandbags (2021) arranged in parallel with each other, wherein the long sandbags (2021) and the short sandbags (2011) are arranged perpendicular to each other.

3. The double-row steel sheet pile cofferdam structure according to claim 2, characterized in that, The short sandbag (2011) has a length of 15-20m and a width of 0.8m. The long sandbag (2021) has a length of 60-120m and a width of 2m. The overlap length between the long sandbag (2021) and the U-shaped steel sheet pile (101) is ≥1.2m.

4. The double-row steel sheet pile cofferdam structure according to claim 1, characterized in that, The length of the U-shaped steel sheet pile (101) inserted into the original mud surface of the foundation is 1.5-2 times the length of the U-shaped steel sheet pile (101) outside the original mud surface of the foundation; The steel tie rod (102) has a diameter of 70 mm, and the distance between two adjacent steel tie rods (102) is 2400 mm.

5. A double-row steel sheet pile cofferdam structure according to claim 1, characterized in that, The flood control channel (4) includes a first crushed stone cushion layer (401), the top of which is connected to a cement-stabilized crushed stone layer (402), and the top of which is connected to a first concrete surface layer (403).

6. A double-row steel sheet pile cofferdam structure according to claim 5, characterized in that, The thickness of the first crushed stone cushion layer (401) is 150 mm, the thickness of the cement-stabilized crushed stone layer (402) is 250 mm, and the thickness of the first concrete surface layer (403) is 260 mm.

7. A double-row steel sheet pile cofferdam structure according to claim 1, characterized in that, The concrete slope protection (5) includes a second crushed stone cushion layer (501), on which a second concrete surface layer (502) is connected, and the thickness of the second concrete surface layer (502) is 100mm.

8. A double-row steel sheet pile cofferdam structure according to claim 7, characterized in that, The vertical height of the concrete slope protection (5) is 1 / 4 of the base width, and the vertical height of the crushed stone slope protection (6) is 1 / 4 of the base width.

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