Double-wall steel cofferdam with special-shaped bottom partition

Abstract

The application relates to a double-wall steel cofferdam with special-shaped bottom compartments, which comprises a steel cofferdam body and a plurality of special-shaped bottom compartments arranged in the steel cofferdam body and connected with the inner wall of the steel cofferdam body and symmetrically distributed about the bridge axis. The special-shaped bottom compartments do not interfere with the pile position in the steel cofferdam body, and the special-shaped bottom compartments divide the steel cofferdam body into a plurality of bottom sealing areas, and each bottom sealing area is independently formed and has an equal area. The application can meet the overall hoisting requirement and can reasonably divide the bottom sealing areas in the steel cofferdam body.

Description

Technical Field

[0001] This application relates to the field of bridge foundation construction technology, specifically to a double-walled steel cofferdam with an irregular bottom compartment. Background Technology

[0002] In existing bridge foundation construction in water, double-walled steel cofferdams are often used for low pile caps in deep water areas. Compared to sheet pile or pipe pile cofferdams, which often use a single-stage bottom sealing method, double-walled steel cofferdams typically employ a compartmentalized bottom sealing method with built-in bottom compartments. This not only makes it easier to ensure the quality of the bottom sealing concrete construction but also reduces the initial investment in compartmentalized bottom sealing concrete construction. Therefore, the construction method using bottom compartmentalized bottom sealing is more widely used.

[0003] However, the existing technology of bottom compartment sealing has the following defects: For non-row pile arrangement in deep water area under tidal environment, bottom compartment is usually sealed by longitudinal and transverse compartments. Since the bottom compartment is manufactured and sunk together with the double-wall steel cofferdam, the bottom compartment sealed by longitudinal and transverse compartments is difficult to meet the overall hoisting requirements due to the influence of pile arrangement, and the sealing area cannot be reasonably divided. Summary of the Invention

[0004] This application provides a double-walled steel cofferdam with an irregular bottom compartment, which can solve the construction problems in the prior art where, for non-row pile arrangement in deep water areas under tidal conditions, the bottom compartment of the double-walled steel cofferdam is difficult to meet the overall hoisting requirements and the bottom sealing area cannot be reasonably divided.

[0005] This application provides a double-walled steel cofferdam with irregularly shaped bottom compartments, comprising: a steel cofferdam body; and a plurality of irregularly shaped bottom compartments disposed inside the steel cofferdam body, connected to the inner wall of the steel cofferdam body, and symmetrically distributed about the bridge axis. The plurality of irregularly shaped bottom compartments do not interfere with the pile positions inside the steel cofferdam body. The plurality of irregularly shaped bottom compartments divide the interior of the steel cofferdam body into a plurality of bottom sealing areas, each bottom sealing area being a separate compartment with an equal area.

[0006] In some embodiments, the irregular bottom compartment is a Y-shaped bottom compartment, and there are two of them.

[0007] In some embodiments, the two Y-shaped bottom compartments are symmetrically distributed about the bridge axis, and each Y-shaped bottom compartment is symmetrically distributed about the pier centerline.

[0008] In some embodiments, the bottom sealing area formed by the two Y-shaped bottom compartments is a parallelogram, and the other separate bottom sealing areas are approximately parallelograms in shape.

[0009] In some embodiments, a sealing concrete is also included, which fills each of the sealing areas.

[0010] In some embodiments, a waterstop is also included, disposed on the outside of the irregular bottom compartment and the inner wall of the steel cofferdam body, and embedded in the bottom sealing concrete.

[0011] In some embodiments, the waterstop is embedded in the bottom sealing concrete at a preset depth.

[0012] In some embodiments, the waterstop is made of angle steel with a side width of 100 mm and a thickness of 10 mm.

[0013] In some embodiments, the waterstop is welded to the irregular bottom compartment and the steel cofferdam body.

[0014] In some embodiments, the steel cofferdam body is a segmented structure.

[0015] The beneficial effects of the technical solutions provided in this application include:

[0016] By setting several irregularly shaped bottom compartments inside the steel cofferdam body and connecting them to the inner wall of the steel cofferdam body, the irregularly shaped bottom compartments and the steel cofferdam body are connected to form an integral whole. This can meet the stress requirements of the steel cofferdam body during hoisting and avoid bending and deformation problems of the steel cofferdam body.

[0017] By symmetrically distributing several irregularly shaped bottom compartments about the bridge axis, ensuring that these compartments do not interfere with the pile positions inside the steel cofferdam body, and dividing the interior of the steel cofferdam body into several sealed-bottom areas, each sealed-bottom area is a separate compartment with equal area, thus effectively balancing the structural weight and external force distribution, improving the stability of the steel cofferdam body under various external conditions, and reducing the risk of structural deformation and tilting. This is particularly beneficial in environments with fast water flow or large water level changes.

[0018] Furthermore, the independent sealing area effectively prevents water penetration and diffusion, ensuring the dryness of each area. Even if local leakage occurs in one area, it will not cause the entire construction area to be flooded, greatly facilitating waterproofing management during construction and improving the controllability and safety of the construction environment. This application solves the construction problems existing in the prior art where, for non-row pile arrangements in deep water areas under tidal conditions, the compartmentalized sealing of the bottom of the double-walled steel cofferdam is difficult to meet the overall hoisting requirements and cannot reasonably divide the sealing area. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a top view of the double-walled steel cofferdam of the irregular bottom compartment in the embodiments of this application;

[0021] Figure 2 for Figure 1 The front sectional view in the middle;

[0022] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0023] In the picture:

[0024] 1. Steel cofferdam body; 2. Irregular bottom compartment; 3. Pile location; 4. Bottom sealing concrete; 5. Waterstop. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0026] This application provides a double-walled steel cofferdam with an irregular bottom compartment, which can solve the construction problems in the prior art where, for non-row pile arrangement in deep water areas under tidal conditions, the bottom compartment of the double-walled steel cofferdam is difficult to meet the overall hoisting requirements and the bottom sealing area cannot be reasonably divided.

[0027] See Figure 1 , Figure 1 This is a top view of the double-walled steel cofferdam of the irregular bottom compartment in an embodiment of this application. (See attached image.) Figure 1 As shown, in one embodiment, the double-walled steel cofferdam with irregular bottom compartments includes: a steel cofferdam body 1 and several irregular bottom compartments 2. The several irregular bottom compartments 2 are disposed inside the steel cofferdam body 1, connected to the inner wall of the steel cofferdam body 1, and symmetrically distributed about the bridge axis. The several irregular bottom compartments 2 do not interfere with the pile positions 3 inside the steel cofferdam body 1. The several irregular bottom compartments 2 divide the interior of the steel cofferdam body 1 into several bottom sealing areas, each bottom sealing area is a separate compartment with an equal area.

[0028] In this embodiment, the steel cofferdam body 1 can be an existing double-walled steel cofferdam, which is welded together from inner and outer steel shells reinforced with vertical angle steel and several layers of annular horizontal trusses, and is watertight. The thickness of the hollow wall of the steel cofferdam body 1 is 1.2 to 1.4 m, based on ease of manufacturing and the ability to pass smoothly through the overburden layer. Several vertical bulkheads are provided between the hollow walls, dividing them into an even number of non-communicating compartments, preferably 8 or 16 compartments, so that the order of water or concrete injection into each compartment can be controlled when the steel cofferdam body 1 sinks or reaches the bottom (riverbed). The steel cofferdam body 1 is manufactured in sections in advance in the factory, and can be manufactured in four sections, usually divided into a bottom section, a second section, a third section, and a top section, while several irregular bottom bulkheads 2 are installed in the bottom section, and the installation method can be welding.

[0029] In addition, an inner wall panel can be installed on the inner side of the steel cofferdam body 1, and several irregular bottom compartments 2 can be connected to the inner wall panel to ensure that the steel cofferdam body 1 forms a whole and further enhance the waterproof effect of the steel cofferdam body 1. At the same time, it can prevent several irregular bottom compartments 2 from being directly connected to the steel cofferdam body 1 and damaging the structure of the steel cofferdam body 1.

[0030] In this embodiment, the several irregular bottom compartments 2 can be two Y-shaped bottom compartments or bottom compartments of other shapes, as long as the interior of the steel cofferdam body 1 can be divided into several bottom sealing areas, and each bottom sealing area is guaranteed to be a separate compartment with equal area (it should be noted that equal area is an ideal situation, and in the actual construction process, it is sufficient to achieve approximately equal area).

[0031] During the construction of the steel cofferdam body 1, the bottom section, the second section, and the third section of the double-walled structure are generally hoisted as a whole. During hoisting, the several irregularly shaped bottom compartments 2 installed on the bottom section must meet the stress requirements of the overall hoisting of the steel cofferdam body 1. This eliminates the need for an assembly platform and lower structure on the steel casing at the pile positions 3, shortens the construction period, and significantly reduces construction costs. The irregularly shaped bottom compartments 2 are symmetrically distributed about the bridge axis and do not interfere with the pile positions 3 arranged inside the steel cofferdam body 1. These compartments divide the interior of the steel cofferdam body 1 into several sealed bottom areas, each a separate compartment with equal area. This ensures a reasonable division of the sealed bottom areas within the steel cofferdam body 1, solving the problems of overall hoisting and sealing of the steel cofferdam body 1.

[0032] In this embodiment, by setting several irregularly shaped bottom compartments 2 inside the steel cofferdam body 1 and connecting them with the inner wall of the steel cofferdam body 1, the irregularly shaped bottom compartments 2 and the steel cofferdam body 1 are connected to form an integral whole. This can meet the stress requirements of the steel cofferdam body 1 during hoisting and avoid bending and deformation problems of the steel cofferdam body 1.

[0033] By symmetrically distributing several irregularly shaped bottom compartments 2 about the bridge axis, ensuring that these compartments do not interfere with the pile positions 3 inside the steel cofferdam body 1, and dividing the interior of the steel cofferdam body 1 into several sealed-bottom areas, each sealed-bottom area being a separate compartment with equal area, this effectively balances the structural weight and external force distribution, improves the stability of the steel cofferdam body 1 under various external conditions, and reduces the risk of structural deformation and tilting. This is particularly beneficial in environments with fast water flow or large water level changes. Furthermore, the independent sealed-bottom areas effectively prevent water seepage and diffusion, ensuring the dryness of each area. Even if local leakage occurs in one area, it will not lead to the flooding of the entire construction area, greatly facilitating waterproofing management during construction and improving the controllability and safety of the construction environment. This embodiment solves the construction problems existing in the prior art where, for non-row pile positions 3 in deep water areas under tidal conditions, the compartmentalized sealing of the bottom compartments of the double-walled steel cofferdam cannot meet the overall hoisting requirements, and the sealed-bottom areas cannot be reasonably divided.

[0034] Furthermore, in one embodiment, such as Figure 1 As shown, the irregular bottom compartment 2 is a Y-shaped bottom compartment, and there are two of them. In this embodiment, the Y-shaped bottom compartment has high strength and stability. By setting two Y-shaped bottom compartments in the steel cofferdam body 1, the sealing area inside the steel cofferdam body 1 can be reasonably divided, which meets the stress requirements during the overall hoisting on site.

[0035] Furthermore, in one embodiment, such as Figure 1 As shown, the two Y-shaped bottom compartments are symmetrically distributed about the bridge axis, and each Y-shaped bottom compartment is symmetrically distributed about the pier centerline. In this embodiment, the symmetrical distribution about the bridge axis means that the two Y-shaped bottom compartments are placed symmetrically on both sides of the bridge's longitudinal direction. This makes the overall structure of the steel cofferdam body 1 more stable and avoids tilting or deformation caused by unilateral loads. At the same time, the symmetrical distribution of the contents of each Y-shaped bottom compartment about the pier centerline further disperses the load, preventing it from concentrating at a single point and enhancing the overall load-bearing capacity and stability of the structure.

[0036] Furthermore, in one embodiment, such as Figure 1 As shown, the sealed area formed by the two Y-shaped bottom compartments is a parallelogram, while the other separated sealed areas are approximately parallelograms. In this embodiment, the sealed area inside the steel cofferdam body 1 is divided by two Y-shaped bottom compartments. The sealed area formed by the two Y-shaped bottom compartments is a parallelogram, while the other separated sealed areas are approximately parallelograms. Considering that opposite sides of a parallelogram are parallel and of equal length, this helps to evenly distribute the load and improve the stability of the structure; at the same time, it can effectively disperse water pressure and avoid local stress concentration, thereby improving the overall load-bearing capacity and durability of the structure.

[0037] Furthermore, in one embodiment, see... Figure 2 , Figure 2 for Figure 1 The front sectional view in the image. For example... Figure 2 As shown, the double-walled steel cofferdam with irregular bottom compartments also includes bottom sealing concrete 4, which fills each bottom sealing area. In this embodiment, the bottom sealing concrete 4 effectively prevents water seepage. By pouring concrete into each bottom sealing area inside the steel cofferdam body 1 to form the bottom sealing concrete 4, water seepage can be effectively prevented, ensuring that the interior of the steel cofferdam body 1 remains dry and providing a good working environment for subsequent construction. In addition, concrete has high strength and durability. The bottom sealing concrete 4, together with the steel cofferdam body 1, significantly improves the load-bearing capacity of the overall structure, especially when facing external water pressure.

[0038] Furthermore, in one embodiment, such as Figure 2 As shown, the double-walled steel cofferdam with irregular bottom compartment 2 also includes a waterstop 5, which is set on the outer side of the irregular bottom compartment 2 and the inner wall of the steel cofferdam body 1, and embedded in the bottom sealing concrete 4. In this embodiment, since double-walled steel cofferdams are mostly set in deep water areas, there is no influence of tidal phenomena. After the bottom sealing of the steel cofferdam body 1 is completed, the load change is small when the strength of the bottom sealing concrete 4 increases. However, in tidal environments, the load changes greatly and is a repeated load. When the concrete strength increases, there may be a loose bond with the steel cofferdam wall, leading to leakage and water inrush. Therefore, the double-walled steel cofferdam also includes a waterstop 5. By setting the waterstop 5 on the outer side of the irregular bottom compartment 2 and the inner wall of the steel cofferdam body 1, and embedding it in the bottom sealing concrete 4, the problem of water inrush and leakage of the bottom sealing concrete 4 in tidal environments is effectively solved, avoiding the problem of later sealing, thereby maximizing economic and construction period benefits.

[0039] Furthermore, in one embodiment, see... Figure 3 , Figure 3 for Figure 2 A magnified view of point A in the middle. (See image below.) Figure 3 As shown, the waterstop 5 is embedded in the bottom sealing concrete 4 at a preset depth. In this embodiment, by embedding the waterstop 5 in the bottom sealing concrete 4 at a preset depth, the bottom sealing concrete 4 is tightly bonded to the irregular bottom compartment 2 and the steel cofferdam body 1, further preventing water leakage and water inrush, ensuring successful bottom sealing, and significantly improving the construction period and economic benefits.

[0040] Furthermore, in one embodiment, such as Figure 3As shown, the waterstop 5 is made of angle steel with a side width of 100 mm and a thickness of 10 mm. In this embodiment, the angle steel has high strength and rigidity. By using angle steel with a side width of 100 mm and a thickness of 10 mm as the waterstop 5, deformation under water pressure can be effectively prevented, water flow can be blocked, the stability of the irregular bottom compartment 2 and the steel cofferdam body 1 can be enhanced, and the safety of the construction process can be ensured.

[0041] Furthermore, in one embodiment, the waterstop 5 is welded to the irregular bottom compartment 2 and the steel cofferdam body 1. In this embodiment, by welding the waterstop 5 to the irregular bottom compartment 2 and the steel cofferdam body 1, a tight waterproof barrier can be formed, effectively preventing water leakage, ensuring the dryness of the construction area, and providing good conditions for subsequent construction.

[0042] Furthermore, in one embodiment, the steel cofferdam body 1 is a segmented structure. In this embodiment, by setting the steel cofferdam body 1 as a segmented structure, each segment of the steel cofferdam body 1 can be produced in a standardized manner in the factory, improving production efficiency and quality control, and facilitating quality inspection and management; in addition, if a segment is damaged or has a problem, only that segment needs to be replaced or repaired without affecting the use of the entire steel cofferdam body 1, reducing maintenance and repair time and costs.

[0043] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0044] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0045] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A double-walled steel cofferdam with an irregularly shaped bottom compartment, characterized in that, include: Steel cofferdam body (1); Several irregularly shaped bottom compartments (2) are set inside the steel cofferdam body (1), connected to the inner wall of the steel cofferdam body (1), and symmetrically distributed about the bridge axis. The irregularly shaped bottom compartments (2) do not interfere with the pile positions (3) inside the steel cofferdam body (1). The irregularly shaped bottom compartments (2) divide the interior of the steel cofferdam body (1) into several bottom sealing areas, each bottom sealing area is a separate compartment with equal area.

2. The double-walled steel cofferdam for the irregularly shaped bottom compartment as described in claim 1, characterized in that, The irregular bottom compartment (2) is a Y-shaped bottom compartment, and there are 2 of them.

3. The double-walled steel cofferdam for the irregularly shaped bottom compartment as described in claim 2, characterized in that, The two Y-shaped bottom compartments are symmetrically distributed about the bridge axis, and each Y-shaped bottom compartment is symmetrically distributed about the pier centerline.

4. The double-walled steel cofferdam for the irregularly shaped bottom compartment as described in claim 3, characterized in that, The bottom sealing area formed by the two Y-shaped bottom compartments is a parallelogram, and the other separate bottom sealing areas are approximately parallelograms in shape.

5. The double-walled steel cofferdam for the irregularly shaped bottom compartment as described in claim 1, characterized in that, It also includes bottom sealing concrete (4), which fills each of the bottom sealing areas.

6. The double-walled steel cofferdam for the irregularly shaped bottom compartment as described in claim 5, characterized in that, It also includes a waterstop (5), which is set on the outside of the irregular bottom compartment (2) and the inner wall of the steel cofferdam body (1), and is embedded in the bottom sealing concrete (4).

7. The double-walled steel cofferdam for the irregularly shaped bottom compartment as described in claim 6, characterized in that, The waterstop (5) is embedded in the bottom sealing concrete (4) at a preset depth.

8. The double-walled steel cofferdam for the irregularly shaped bottom compartment as described in claim 6, characterized in that, The waterstop (5) is made of angle steel with a side width of 100 mm and a thickness of 10 mm.

9. The double-walled steel cofferdam for the irregularly shaped bottom compartment as described in claim 8, characterized in that, The waterstop (5) is welded to the irregular bottom compartment (2) and the steel cofferdam body (1).

10. The double-walled steel cofferdam for the irregularly shaped bottom compartment as described in claim 1, characterized in that, The steel cofferdam body (1) is a segmented structure.

Images