Fabricated precast concrete cofferdam structure

Abstract

The utility model discloses an assembly type precast concrete cofferdam structure which comprises a first concrete retention wall and a second concrete retention wall which are arranged side by side, a hydraulic fastening device is arranged on the outer wall of the first concrete retention wall and the outer wall of the second concrete retention wall, and a gravel layer is filled between the first concrete retention wall and the second concrete retention wall. A cofferdam supporting structure is fixedly connected to the side face of the first concrete retention wall, and a geomembrane layer is laid on the side face of the second concrete retention wall. According to the assembly type precast concrete cofferdam structure, the problem that in the prior art, the concrete blocks cannot be used again after manual dismantling and blasting dismantling is conducted is solved.

Description

Technical Field

[0001] This utility model belongs to the field of cofferdam technology in water conservancy projects, specifically relating to prefabricated concrete cofferdam structures. Background Technology

[0002] In water conservancy projects, cofferdams, as temporary structures, are widely used for water retention, support, and the construction of construction platforms. Traditional concrete cofferdams are mostly cast in place, which not only has a long construction period but also has a significant impact on the surrounding environment. In contrast, precast concrete cofferdam structures are assembled using precast modules, offering advantages such as faster construction speed, less environmental impact, ease of dismantling, and reusability. However, existing precast concrete cofferdams still have room for improvement in terms of structural stability and ease of construction. Furthermore, the concrete blocks from existing precast concrete cofferdams cannot be reused after manual or blasting demolition, resulting in resource waste. Utility Model Content

[0003] The purpose of this invention is to provide a prefabricated concrete cofferdam structure that solves the problem that concrete blocks cannot be reused after manual or blast demolition in the prior art.

[0004] The technical solution adopted by this utility model is an assembled precast concrete cofferdam structure, including a first concrete retaining wall and a second concrete retaining wall arranged side by side. The outer walls of the first concrete retaining wall and the second concrete retaining wall are jointly provided with hydraulic fastening devices. A gravel layer is filled between the first concrete retaining wall and the second concrete retaining wall. A cofferdam support structure is fixed to the side of the first concrete retaining wall, and a geomembrane layer is laid on the side of the second concrete retaining wall.

[0005] The features of this utility model also include:

[0006] The hydraulic fastening device includes several hydraulic fastening cables, which are arranged in parallel and wrapped around the outer sides of the first and second concrete retaining walls.

[0007] One end of each hydraulic fastening cable is fixed with a through-ring, and the other end of the hydraulic fastening cable passes through the through-ring and is connected to the hydraulic fastener.

[0008] The cofferdam support structure consists of several supporting steel pipes, one end of which is fixed to a hydraulic fastening cable, and the supporting steel pipes are all fixed together by scissor bracing.

[0009] The scissor brace consists of two fixed steel pipes arranged in a cross pattern. The two fixed steel pipes are fixed together in the middle by a first clamp, and both ends of the two fixed steel pipes are fixed to the supporting steel pipe by a second clamp.

[0010] The first concrete retaining wall is located at the red line of the cofferdam, and the second concrete retaining wall is located on the water-facing side. The geomembrane layer is laid on the water-facing surface of the second concrete retaining wall, and the cofferdam support structure is fixed to the side of the first concrete retaining wall away from the water-facing surface of the second concrete retaining wall.

[0011] Both the first and second concrete retaining walls consist of several concrete blocks arranged side by side, with waterproof strips installed between each block.

[0012] A connection positioning hole is provided in the middle of the concrete block. The connection positioning hole is set along the axial direction of the concrete block. Several steel hoops are also provided at both ends of the concrete block. The steel hoops are evenly arranged around the connection positioning hole.

[0013] One side of the concrete block has a protrusion, and the other side of the concrete block has a groove, with the protrusion and groove corresponding to each other.

[0014] The beneficial effects of this utility model are:

[0015] The prefabricated concrete cofferdam structure provided by this utility model uses a vibratory pile driver to drive the first concrete block into the location where the cofferdam needs to be set up. Then, a hydraulic fastening device is set on the outside of the concrete block. Then, according to the guide, the next pile is driven to fit the two concrete blocks together. This process is repeated to assemble the cofferdam. Finally, the cofferdam is secured with the hydraulic fastening device. When dismantling is required, the two concrete blocks can be separated by loosening the hydraulic fastening device. The overall structure is simple, easy to cast, easy to assemble and dismantle. It also improves on traditional processes, avoiding the situation where the concrete blocks cannot be reused after manual or explosive dismantling. This enables the continuous use of the cofferdam, reduces resource consumption, and conforms to the current green, environmentally friendly and sustainable development concept. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of the prefabricated concrete cofferdam structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the scissor brace of this utility model;

[0018] Figure 3 This is a front view of the prefabricated concrete cofferdam structure of this utility model;

[0019] Figure 4 This is a structural schematic diagram of the concrete block of this utility model.

[0020] In the diagram, 1. First concrete retaining wall, 2. Second concrete retaining wall, 3. Hydraulic fastening cable, 4. Gravel layer, 5. Geomembrane layer, 6. Concrete block, 7. Waterproof strip, 8. Connecting positioning hole, 9. Steel hoop, 10. Through ring, 11. Protrusion, 12. Groove, 13. Supporting steel pipe, 14. Fixing steel pipe, 15. First clamp, 16. Second clamp. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0022] The prefabricated concrete cofferdam structure provided by this utility model, such as Figure 1 As shown, the cofferdam includes a first concrete retaining wall 1 and a second concrete retaining wall 2 arranged side by side. Both the first and second concrete retaining walls 1 and 2 are equipped with hydraulic fastening devices on their outer walls, which also serve as guides during construction. After construction, the hydraulic fastening devices are used to tighten the first and second concrete retaining walls 1 and 2, further enhancing the cofferdam's anti-seepage performance. A gravel layer 4 is filled between the first and second concrete retaining walls 1 and 2. A cofferdam support structure is fixed to the side of the first concrete retaining wall 1 for easy support. A geomembrane layer 5 is laid on the side of the second concrete retaining wall 2 to facilitate reinforcement. Waterproofing effect; the hydraulic fastening device includes several hydraulic fastening cables 3, which are arranged in parallel and wound around the outer sides of the first concrete retaining wall 1 and the second concrete retaining wall 2; one end of each hydraulic fastening cable 3 is fixedly connected to a through loop 10, and the other end of the hydraulic fastening cable 3 passes through the through loop 10 and connects to a hydraulic fastener, facilitating the fastening of the first concrete retaining wall 1 and the second concrete retaining wall 2 through the hydraulic fastener; the cofferdam support structure includes several supporting steel pipes 13, one end of each supporting steel pipe 13 is fixedly connected to the hydraulic fastening cable 3, and the supporting steel pipes 13 are all fixedly connected to each other by scissor bracing. Figure 2 As shown, the scissor bracing includes two fixed steel pipes 14, which are arranged crosswise. The two fixed steel pipes 14 are fixedly connected at the middle by a first clamp 15, and both ends of the two fixed steel pipes are fixedly connected to the supporting steel pipe 13 by a second clamp 16. The first concrete retaining wall 1 is located at the red line of the cofferdam, and the second concrete retaining wall 2 is located on the water-facing side. The geomembrane layer 5 is laid on the water-facing surface of the second concrete retaining wall 2, and the cofferdam support structure is fixed to the side of the first concrete retaining wall 1 away from the water-facing surface of the second concrete retaining wall 2. Figure 3 As shown, both the first concrete retaining wall 1 and the second concrete retaining wall 2 include several concrete blocks 6. Each concrete block 6 is prefabricated in a factory and has a uniform size and shape. Several concrete blocks 6 are arranged side by side, and waterproof strips 7 are provided between the concrete blocks 6. Figure 4As shown, the concrete block 6 has a connecting positioning hole 8 in the middle, which is convenient for connecting and positioning at the top and bottom. The connecting positioning hole 8 is set along the axial direction of the concrete block 6. Several steel hoops 9 are also provided at both ends of the concrete block 6. The steel hoops 9 are evenly arranged around the connecting positioning hole 8. One side of the concrete block 6 has a protrusion 11 and the other side of the concrete block 6 has a groove 12, with the protrusion 11 and the groove 12 corresponding to each other.

[0023] The prefabricated concrete cofferdam structure provided by this utility model works as follows: a concrete block 6 is taken and driven into the cofferdam boundary using a tracked vibratory pile driver. Then, a hydraulic fastening device is fitted onto the outside of the fixed concrete block 6. The remaining concrete blocks 6 are then driven in sequentially. A gravel layer 4 is filled between the two rows of concrete blocks 6. Finally, the hydraulic fastening device is activated to fasten the first concrete retaining wall 1 and the second concrete retaining wall 2. Then, a geomembrane layer 5 is laid on the water-facing side of the cofferdam to complete the assembly of the cofferdam. When dismantling is required, the concrete block 6 can be pulled out by loosening the hydraulic fastening device, making dismantling convenient.

[0024] Example 1

[0025] The prefabricated concrete cofferdam structure proposed in this embodiment, such as Figure 1 As shown, it includes a first concrete retaining wall 1 and a second concrete retaining wall 2 arranged side by side. The outer walls of the first concrete retaining wall 1 and the second concrete retaining wall 2 are jointly provided with hydraulic fastening devices. A gravel layer 4 is filled between the first concrete retaining wall 1 and the second concrete retaining wall 2. A cofferdam support structure is fixed to the side of the first concrete retaining wall 1, and a geomembrane layer 5 is laid on the side of the second concrete retaining wall 2.

[0026] Example 2

[0027] The prefabricated concrete cofferdam structure proposed in this embodiment, such as Figure 1 As shown, it includes a first concrete retaining wall 1 and a second concrete retaining wall 2 arranged side by side. The outer walls of the first concrete retaining wall 1 and the second concrete retaining wall 2 are jointly provided with a hydraulic fastening device. A gravel layer 4 is filled between the first concrete retaining wall 1 and the second concrete retaining wall 2. A cofferdam support structure is fixed to the side of the first concrete retaining wall 1, and a geomembrane layer 5 is laid on the side of the second concrete retaining wall 2. The hydraulic fastening device includes several hydraulic fastening cables 3, which are arranged in parallel and wrapped around the outer sides of the first concrete retaining wall 1 and the second concrete retaining wall 2.

[0028] Example 3

[0029] The prefabricated concrete cofferdam structure proposed in this embodiment, such as Figure 1As shown, the structure includes a first concrete retaining wall 1 and a second concrete retaining wall 2 arranged side by side. The outer walls of the first concrete retaining wall 1 and the second concrete retaining wall 2 are jointly equipped with a hydraulic fastening device. A gravel layer 4 is filled between the first concrete retaining wall 1 and the second concrete retaining wall 2. A cofferdam support structure is fixed to the side of the first concrete retaining wall 1, and a geomembrane layer 5 is laid on the side of the second concrete retaining wall 2. The hydraulic fastening device includes several hydraulic fastening cables 3, which are arranged in parallel and wrapped around the outer sides of the first concrete retaining wall 1 and the second concrete retaining wall 2. One end of each hydraulic fastening cable 3 is fixed with a through loop 10, and the other end of the hydraulic fastening cable 3 passes through the through loop 10 and is connected to the hydraulic fastener.

[0030] Example 4

[0031] The prefabricated concrete cofferdam structure proposed in this embodiment, such as Figure 1 As shown, the structure includes a first concrete retaining wall 1 and a second concrete retaining wall 2 arranged side by side. The outer walls of both the first and second concrete retaining walls are equipped with hydraulic fastening devices. A gravel layer 4 fills the space between the first and second concrete retaining walls 1 and 2. A cofferdam support structure is fixed to the side of the first concrete retaining wall 1, and a geomembrane layer 5 is laid on the side of the second concrete retaining wall 2. The hydraulic fastening device includes several hydraulic fastening cables 3, which are arranged in parallel and wound around the outer surfaces of the first and second concrete retaining walls 1 and 2. One end of each hydraulic fastening cable 3 is fixed with a through-ring 10, and the other end of the cable passes through the through-ring 10 and connects to a hydraulic fastener. The cofferdam support structure includes several supporting steel pipes 13, one end of which is fixed to the hydraulic fastening cables 3, and the supporting steel pipes 13 are connected to each other by scissor bracing.

[0032] Example 5

[0033] The prefabricated concrete cofferdam structure proposed in this embodiment, such as Figure 1As shown, the structure includes a first concrete retaining wall 1 and a second concrete retaining wall 2 arranged side by side. Both the first and second concrete retaining walls 1 and 2 are equipped with hydraulic fastening devices on their outer walls. A gravel layer 4 fills the space between the first and second concrete retaining walls 1 and 2. A cofferdam support structure is fixed to the side of the first concrete retaining wall 1, and a geomembrane layer 5 is laid on the side of the second concrete retaining wall 2. The hydraulic fastening device includes several hydraulic fastening cables 3, arranged in parallel, and wound around the outer surfaces of the first and second concrete retaining walls 1 and 2. One end of each hydraulic fastening cable 3 is fixed with a through-ring 10, and the other end of the cable passes through the through-ring 10 and connects to a hydraulic fastener. The cofferdam support structure includes several supporting steel pipes 13, one end of which is fixed to the hydraulic fastening cables 3, and the supporting steel pipes 13 are connected to each other by scissor bracing. Figure 2 As shown, the scissor brace includes two fixed steel pipes 14, which are arranged in a cross pattern. The middle of the two fixed steel pipes 14 is fixedly connected by a first clamp 15, and both ends of the two fixed steel pipes are fixedly connected to the supporting steel pipe 13 by a second clamp 16.

[0034] Example 6

[0035] The prefabricated concrete cofferdam structure proposed in this embodiment, such as Figure 1 As shown, the structure includes a first concrete retaining wall 1 and a second concrete retaining wall 2 arranged side by side. Both the first and second concrete retaining walls 1 and 2 are equipped with hydraulic fastening devices on their outer walls. A gravel layer 4 fills the space between the first and second concrete retaining walls 1 and 2. A cofferdam support structure is fixed to the side of the first concrete retaining wall 1, and a geomembrane layer 5 is laid on the side of the second concrete retaining wall 2. The hydraulic fastening device includes several hydraulic fastening cables 3, arranged in parallel, and wound around the outer surfaces of the first and second concrete retaining walls 1 and 2. One end of each hydraulic fastening cable 3 is fixed with a through-ring 10, and the other end of the cable passes through the through-ring 10 and connects to a hydraulic fastener. The cofferdam support structure includes several supporting steel pipes 13, one end of which is fixed to the hydraulic fastening cables 3, and the supporting steel pipes 13 are connected to each other by scissor bracing. Figure 2 As shown, the scissor bracing includes two fixed steel pipes 14, which are arranged crosswise. The middle of the two fixed steel pipes 14 is fixedly connected by a first clamp 15, and both ends of the two fixed steel pipes are fixedly connected to the supporting steel pipe 13 by a second clamp 16. The first concrete retaining wall 1 is located at the red line of the cofferdam, and the second concrete retaining wall 2 is located on the water-facing side. The geomembrane layer 5 is laid on the water-facing surface of the second concrete retaining wall 2, and the cofferdam support structure is fixedly connected to the side of the first concrete retaining wall 1 away from the water-facing surface of the second concrete retaining wall 2.

[0036] Example 7

[0037] The prefabricated concrete cofferdam structure proposed in this embodiment, such as Figure 1 As shown, the structure includes a first concrete retaining wall 1 and a second concrete retaining wall 2 arranged side by side. Both the first and second concrete retaining walls 1 and 2 are equipped with hydraulic fastening devices on their outer walls. A gravel layer 4 fills the space between the first and second concrete retaining walls 1 and 2. A cofferdam support structure is fixed to the side of the first concrete retaining wall 1, and a geomembrane layer 5 is laid on the side of the second concrete retaining wall 2. The hydraulic fastening device includes several hydraulic fastening cables 3, arranged in parallel, and wound around the outer surfaces of the first and second concrete retaining walls 1 and 2. One end of each hydraulic fastening cable 3 is fixed with a through-ring 10, and the other end of the cable passes through the through-ring 10 and connects to a hydraulic fastener. The cofferdam support structure includes several supporting steel pipes 13, one end of which is fixed to the hydraulic fastening cables 3, and the supporting steel pipes 13 are connected to each other by scissor bracing. Figure 2 As shown, the scissor bracing includes two fixed steel pipes 14, which are arranged crosswise. The two fixed steel pipes 14 are fixedly connected at the middle by a first clamp 15, and both ends of the two fixed steel pipes are fixedly connected to the supporting steel pipe 13 by a second clamp 16. The first concrete retaining wall 1 is located at the red line of the cofferdam, and the second concrete retaining wall 2 is located on the water-facing side. The geomembrane layer 5 is laid on the water-facing surface of the second concrete retaining wall 2, and the cofferdam support structure is fixed to the side of the first concrete retaining wall 1 away from the water-facing surface of the second concrete retaining wall 2. Figure 3 As shown, both the first concrete retaining wall 1 and the second concrete retaining wall 2 include a number of concrete blocks 6, which are arranged side by side, and waterproof strips 7 are provided between each concrete block 6.

[0038] Example 8

[0039] The prefabricated concrete cofferdam structure proposed in this embodiment, such as Figure 1As shown, the structure includes a first concrete retaining wall 1 and a second concrete retaining wall 2 arranged side by side. Both the first and second concrete retaining walls 1 and 2 are equipped with hydraulic fastening devices on their outer walls. A gravel layer 4 fills the space between the first and second concrete retaining walls 1 and 2. A cofferdam support structure is fixed to the side of the first concrete retaining wall 1, and a geomembrane layer 5 is laid on the side of the second concrete retaining wall 2. The hydraulic fastening device includes several hydraulic fastening cables 3, arranged in parallel, and wound around the outer surfaces of the first and second concrete retaining walls 1 and 2. One end of each hydraulic fastening cable 3 is fixed with a through-ring 10, and the other end of the cable passes through the through-ring 10 and connects to a hydraulic fastener. The cofferdam support structure includes several supporting steel pipes 13, one end of which is fixed to the hydraulic fastening cables 3, and the supporting steel pipes 13 are connected to each other by scissor bracing. Figure 2 As shown, the scissor bracing includes two fixed steel pipes 14, which are arranged crosswise. The two fixed steel pipes 14 are fixedly connected at the middle by a first clamp 15, and both ends of the two fixed steel pipes are fixedly connected to the supporting steel pipe 13 by a second clamp 16. The first concrete retaining wall 1 is located at the red line of the cofferdam, and the second concrete retaining wall 2 is located on the water-facing side. The geomembrane layer 5 is laid on the water-facing surface of the second concrete retaining wall 2, and the cofferdam support structure is fixed to the side of the first concrete retaining wall 1 away from the water-facing surface of the second concrete retaining wall 2. Figure 3 As shown, both the first concrete retaining wall 1 and the second concrete retaining wall 2 include several concrete blocks 6, which are arranged side by side, and waterproof strips 7 are provided between each concrete block 6. Figure 4 As shown, a connecting positioning hole 8 is provided in the middle of the concrete block 6. The connecting positioning hole 8 is set along the axial direction of the concrete block 6. Several steel hoops 9 are also provided at both ends of the concrete block 6. The several steel hoops 9 are evenly arranged around the connecting positioning hole 8. A protrusion 11 is provided on one side of the concrete block 6, and a groove 12 is provided on the other side of the concrete block 6. The protrusion 11 and the groove 12 correspond to each other.

Claims

1. A prefabricated concrete cofferdam structure, characterized in that, It includes a first concrete retaining wall (1) and a second concrete retaining wall (2) arranged side by side. The outer walls of the first concrete retaining wall (1) and the second concrete retaining wall (2) are provided with hydraulic fastening devices. A gravel layer (4) is filled between the first concrete retaining wall (1) and the second concrete retaining wall (2). A cofferdam support structure is fixed to the side of the first concrete retaining wall (1). A geomembrane layer (5) is laid on the side of the second concrete retaining wall (2).

2. The prefabricated concrete cofferdam structure according to claim 1, characterized in that, The hydraulic fastening device includes several hydraulic fastening cables (3), which are arranged in parallel and wrapped around the outer sides of the first concrete retaining wall (1) and the second concrete retaining wall (2).

3. The prefabricated concrete cofferdam structure according to claim 2, characterized in that, One end of each hydraulic fastening cable (3) is fixed with a through loop (10), and the other end of the hydraulic fastening cable (3) passes through the through loop (10) and is connected to the hydraulic fastener.

4. The prefabricated concrete cofferdam structure according to claim 2, characterized in that, The cofferdam support structure includes several support steel pipes (13), one end of each of the several support steel pipes (13) is fixed to the hydraulic fastening cable (3), and the several support steel pipes (13) are fixed to each other by scissor bracing.

5. The prefabricated concrete cofferdam structure according to claim 4, characterized in that, The scissor brace includes two fixed steel pipes (14), which are arranged crosswise. The middle of the two fixed steel pipes (14) is fixedly connected by a first clamp (15), and both ends of the two fixed steel pipes are fixedly connected to the supporting steel pipe (13) by a second clamp (16).

6. The prefabricated concrete cofferdam structure according to claim 1, characterized in that, The first concrete retaining wall (1) is located at the red line of the cofferdam, the second concrete retaining wall (2) is located on the water-facing side, the geomembrane layer (5) is laid on the water-facing surface of the second concrete retaining wall (2), and the cofferdam support structure is fixed to the side of the first concrete retaining wall (1) away from the water-facing surface of the second concrete retaining wall (2).

7. The prefabricated concrete cofferdam structure according to claim 1, characterized in that, The first concrete retaining wall (1) and the second concrete retaining wall (2) each include a number of concrete blocks (6), the number of concrete blocks (6) are arranged side by side, and waterproof strips (7) are provided between the number of concrete blocks (6).

8. The prefabricated concrete cofferdam structure according to claim 7, characterized in that, The concrete block (6) is provided with a connection positioning hole (8) in the middle. The connection positioning hole (8) is arranged along the axial direction of the concrete block (6). Several steel hoops (9) are also provided at both ends of the concrete block (6). Several steel hoops (9) are evenly arranged around the connection positioning hole (8).

9. The prefabricated concrete cofferdam structure according to claim 7, characterized in that, The concrete block (6) has a protrusion (11) on one side and a groove (12) on the other side, with the protrusion (11) and the groove (12) corresponding to each other.

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