A pressure rod device for balancing force changes of a steel hanging box cofferdam during construction
By designing the connection between the pressure bar device and the steel caisson and steel casing, the overturning problem of the steel caisson cofferdam caused by stress changes during construction was solved, improving the bending stiffness and overall rigidity, and ensuring construction safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CCCC SECOND HARBOR ENGINEERING CO LTD
- Filing Date
- 2025-07-29
- Publication Date
- 2026-07-14
AI Technical Summary
Steel cofferdams pose a safety hazard due to potential overturning issues caused by stress changes during construction.
Design a compression member device, including a compression member body, a first node member and a third node plate, which, through connection with a steel caisson and a steel casing, forms a reliable load-bearing structure to adapt to load changes during construction.
This improved the bending stiffness and overall rigidity of the steel cofferdam, reduced the possibility of overturning, and ensured the stability and safety of the construction process.
Smart Images
Figure CN224495184U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bridge deep-water foundation construction technology, and in particular to a pressure bar device for balancing the stress changes of steel cofferdams during construction. Background Technology
[0002] In recent years, with rapid economic growth and the need to alleviate traffic pressure caused by population growth, my country's transportation infrastructure construction has been promoted, especially the vigorous development of long-span bridge engineering. Water-related construction conditions are unavoidable during bridge construction. To ensure a dry foundation construction environment, methods for containing water during foundation construction, such as steel caisson cofferdams, steel sheet pile cofferdams, and bottomless steel caisson cofferdams, have been proposed.
[0003] Currently, steel caisson cofferdams are commonly used for deep-water foundation construction. As an effective water-blocking structure, the steel caisson cofferdam's side plates and bottom concrete sealing layer effectively isolate external water, ensuring a dry internal environment. Furthermore, the side plates and bottom plate of the steel caisson can serve as temporary functional formwork for deep-water foundation and bottom concrete construction. In addition, steel caisson cofferdams offer advantages such as short construction period, low water flow resistance, and relatively low construction difficulty.
[0004] However, the stress system of the steel caisson changes during construction. Initially, the weight of the cofferdam is the primary load during its construction. As construction progresses and the cofferdam is submerged, the buoyancy it experiences increases with depth, exceeding the weight of the steel caisson and becoming the main load. This change in stress on the steel caisson can easily lead to its overturning, posing a safety hazard. Utility Model Content
[0005] This invention provides a pressure bar device for balancing the force changes of a steel caisson cofferdam during construction, with the aim of reducing the possibility of overturning due to changes in the resultant force on the steel caisson as the construction process progresses.
[0006] To achieve the above objectives, this utility model provides a pressure bar device for balancing stress changes during the construction of a steel cofferdam, comprising:
[0007] The main body of the pressure rod is connected to the bottom plate of the steel caisson at one end along the axial direction. The main body of the pressure rod includes a first web and a first flange. There are two first flanges, and both first flanges protrude from the same side of the first web, so that the main body of the pressure rod is configured as a groove. The plane located on the side of the first web away from the first flange and parallel to the first web is the reference plane. There are multiple main bodies of the pressure rod, and the multiple main bodies of the pressure rod are symmetrically arranged about the reference plane. The space between two main bodies of the pressure rod is a reinforcement gap.
[0008] The first node member includes a second web and a second flange. There are two second flanges, and both second flanges protrude from both sides of the second web, so that the first node member is configured in an H shape. The second web can be disposed within the reinforcement gap, and the two second flanges can restrict the displacement of part of the structure of the compression bar body.
[0009] The third node plate is configured to be connected to one end of the pressure bar body that is axially away from the bottom plate of the steel caisson and the steel casing, respectively, so that the pressure bar device can be connected to the bottom plate of the steel caisson and the steel casing, respectively.
[0010] In one embodiment, the pressure bar device includes a second node plate, at least a portion of which is disposed within the reinforcement gap, and the second node plate is connected to the third node plate and the steel casing, respectively.
[0011] In one embodiment, there are multiple first node members, and the multiple first node members are arranged at axial intervals along the main body of the pressure bar.
[0012] In one embodiment, the side of the third node plate closest to the steel casing is configured as an arc shape, and the radius of the arc of the third node plate is equal to the radius of the steel casing.
[0013] In one embodiment, there are multiple pressure rod devices, which are spaced apart on the outer periphery of the steel casing.
[0014] The above-mentioned solution of this utility model has the following beneficial effects:
[0015] In this embodiment, the main body of the compression member is configured in a groove shape, giving the compression member device high bending stiffness. The two main bodies are arranged symmetrically around a reference plane, further enhancing the bending stiffness of the device and enabling it to effectively resist the transition between tensile and compressive loads during construction. The constraint of the H-shaped first node reduces the likelihood of instability. One axial end of the main body is connected to the steel caisson, and the other end is connected to the steel casing via a third node plate. This allows the compression member device to form reliable connections with both the steel casing and the steel caisson, enabling it to automatically switch its working state according to changes in the direction of force, thereby reducing the possibility of overturning due to changes in the resultant force on the steel caisson during construction. After concrete is poured inside the steel caisson, the relatively complex cross-section of the main body and the first node allows them to be better encased in concrete and jointly bear the resultant force on the steel caisson, improving the overall stiffness and durability of the compression member device.
[0016] Other beneficial effects of this invention will be described in detail in the following detailed description section. Attached Figure Description
[0017] Figure 1 This is a schematic diagram showing the assembly of the pressure bar device with the steel casing and the bottom plate of the steel caisson in one embodiment of the present invention;
[0018] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at point AA;
[0019] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure at point BB;
[0020] Figure 4 This is a schematic diagram of the assembly of the third node plate and the steel casing in one embodiment of the present invention;
[0021] Figure 5 This is a schematic diagram of the structural arrangement of the pressure rod device and the steel casing inside the steel caisson in one embodiment of the present invention;
[0022] Figure 6 for Figure 5 A magnified schematic diagram of the structure at point C.
[0023] [Explanation of Labels in the Attached Image]
[0024] 100. Compression rod device; 1. Compression rod body; 11. First web plate; 12. First flange; 11a. Reinforcement gap; 2. First node component; 21. Second web plate; 22. Second flange; 3. Second node plate; 4. Third node plate; 200. Steel caisson; 300. Steel casing. Detailed Implementation
[0025] To make the technical problems, solutions, and advantages of this utility model clearer, a detailed description will be provided below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.
[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," 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 utility model 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 utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a locking 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0028] To address the stability issues caused by dynamic changes in buoyancy during the construction of steel caisson cofferdams, this application provides a pressure bar device for balancing stress changes during construction. Through the combined design of the pressure bar body and multiple node plates, it solves multiple problems caused by dynamic changes in buoyancy during the construction of steel caisson cofferdams, such as overturning of the steel caisson, adapting to load changes at different construction stages and ensuring project safety. Figure 5 The diagram shows a portion of the structure of a steel caisson, a relatively large structure assembled from large steel plates and structural sections, resulting in a complex structure. Steel caissons provide sufficient lateral restraint and support, and can improve construction efficiency.
[0029] It should be noted that as the steel caisson descends to the preset elevation, the magnitude and direction of the resultant force (the resultant force of its own weight and buoyancy) will change, and the caisson may overturn during this process. Therefore, the steel caisson needs an auxiliary structure with sufficient rigidity and strength to resist the changes in the resultant force, that is, to apply external force to the auxiliary structure so that the steel caisson can continue to descend to the preset elevation relatively smoothly.
[0030] Specifically, please refer to Figures 1-3The pressure bar device 100 includes a pressure bar body 1, a first node member 2, and a third node plate 4. The pressure bar body 1, the first node member 2, and the third node plate 4 are all made of materials with certain strength and hardness, such as steel. One axial end of the pressure bar body 1 is connected to the bottom plate of the steel lifting box 200, for example, by welding. The pressure bar body 1 includes a first web plate 11 and two first flanges 12, both of which protrude from the same side of the first web plate 11, so that the pressure bar body 1 is configured as follows: Figure 2 The groove shape shown is designed to give the compression member body 1 high bending stiffness, thereby enabling it to effectively resist the transition of tensile and compressive loads during construction. For example, the compression member body 1 can be a channel steel, specifically a 16a channel steel with a web height, flange width, and web thickness of 160mm, 63mm, and 6.5mm respectively, and a cross-sectional area of 21.962cm². 2 Its linear density is 17.240 kg / m³. Please refer to [link / reference]. Figure 2 The plane located on the side of the first web 11 away from the first flange 12 and parallel to the first web 11 is used as the reference plane. Multiple pressure bar bodies 1 are arranged symmetrically around the reference plane, constituting the main structure of the pressure bar device 100 of this application. One end of each pressure bar body 1 along the axial direction is connected to the bottom plate of the steel lifting box 200. The gap between the multiple pressure bar bodies 1 is a reinforcement gap 11a, that is, the gap between the first web 11 corresponding to the multiple symmetrically arranged pressure bar bodies 1 is the reinforcement gap 11a. For example, the number of pressure bar bodies 1 can be two.
[0031] The first node member 2 includes a second web 21 and two second flanges 22, both of which protrude from both sides of the second web 21, so that the first node member 2 is configured in an H-shape. For example, the first node member 2 can be an H-beam, the material of which can be Q235B, and the section height, flange width, web thickness, and flange thickness of the H-beam can be 200mm, 200mm, 12mm, and 12mm, respectively. Please refer to [link / reference]. Figure 2 and Figure 3 The second web 21 can be disposed within the reinforcing gap 11a, and the two second flanges 22 can restrict displacement of a portion of the structure of the compression member body 1. For example, please refer to... Figure 2 and Figure 3The first node 2 has a dimension much smaller than that of the main body 1 in the axial direction. The first node 2 is positioned at a predetermined location along the axial direction of the main body 1. A portion of the structure of both main bodies 1 within the range of the first node 2 is located within the space enclosed by the second web 21 and the second flange 22, thus forming a constraint perpendicular to the axial direction on the main body 1. This helps limit the displacement of the main body 1 in the direction perpendicular to the axial direction, thereby improving the stability of the pressure rod device 100. Compared to directly configuring the main body 1 as an H-beam, the structural form of assembling the main body 1 with the first node 2 in this application offers greater flexibility and convenience in construction, and the symmetrically arranged channel steel has two webs, resulting in better bending resistance.
[0032] Please see Figure 1 , Figure 3 and Figure 4 The third node plate 4 is configured to be connected, for example by welding, to one end of the pressure bar body 1 that is axially opposite to the bottom plate of the steel caisson 200 and the steel casing 300, respectively, so that the pressure bar device 100 can be connected to the bottom plate of the steel caisson 200 and the steel casing 300 respectively. Thus, the pressure bar device 100, which has good rigidity and strength, can form a relatively reliable connection with the steel casing 300 and the steel caisson 200 respectively.
[0033] For example, please refer to Figure 1 When the steel caisson 200 is not submerged or is submerged in shallow water, gravity is the primary load. The pressure rod device 100, connected to the bottom plate of the steel caisson 200 by welding, bears the tensile force caused by the weight of the steel caisson 200. As the submerged depth of the steel caisson 200 increases, buoyancy gradually exceeds its own weight and becomes the primary load. The force direction of the pressure rod device 100 changes from tension to compression, requiring the balancing of the upward lifting force of buoyancy on the steel caisson 200. One end of the pressure rod device 100 is welded to the bottom plate of the steel caisson 200, and the other end is fixed to the steel casing 300. This connection method allows the pressure rod device 100 to automatically switch its working state according to the change of the force direction.
[0034] In this embodiment, the main body 1 of the compression rod is configured in a groove shape, giving the compression rod device 100 high bending stiffness. The two main bodies 1 are arranged symmetrically with respect to a reference plane, further improving the bending stiffness of the compression rod device 100, enabling it to effectively resist the conversion of tensile and compressive loads during construction. Under the constraint of the first node member 2, which is configured in an H-shape, the possibility of instability of the compression rod device 100 is reduced. One end of the main body 1 along the axial direction is connected to the steel casing 200, and the other end is connected to the steel casing 300 through the third node plate 4, allowing the compression rod device 100 to form a relatively reliable connection with both the steel casing 300 and the steel casing 200. This allows the compression rod device 100 to automatically switch its working state according to changes in the direction of force, thereby reducing the possibility of overturning due to changes in the resultant force on the steel casing 200 during construction. After concrete is poured inside the steel casket 200, the main body 1 of the compression bar and the first node 2, which have a relatively complex cross-section, can be better encased in concrete and jointly bear the resultant force on the steel casket 200, which is beneficial to improving the overall rigidity and durability of the compression bar device 100.
[0035] In one embodiment, please refer to Figure 1 and Figure 3 The compression member device 100 includes a second node plate 3, at least a portion of which is disposed within a reinforcement gap 11a. The second node plate 3 is connected to a third node plate 4 and a steel casing 300. For example, the structure of the second node plate 3 within the reinforcement gap 11a can be welded to the first web plate 11 of the compression member body 1 to strengthen the connection between the compression member body 1 and the steel casing 300. When the second node plate 3 is connected to the first web plate 11, the tensile force caused by the weight of the steel caisson 200 borne by the compression member device 100 can be transferred to the steel casing 300, reducing the possibility of tensile force concentration on the third node plate 4, and consequently reducing the possibility of connection failure between the third node plate 4 and the compression member body 1 and the steel casing 300. For example, the second node plate 3 can be a rectangular steel plate, the material of the second node plate 3 can be Q235B, and the plate thickness, width, and length of the second node plate 3 can be 12mm, 300mm, and 550mm, respectively.
[0036] In one embodiment, please refer to Figure 1 and Figure 3 The number of first node members 2 is multiple, and these multiple first node members 2 are arranged at intervals along the axial direction of the compression member body 1 to further reduce the possibility of instability of the compression member body 1. For example, please refer to... Figure 1 and Figure 3The number of first node components 2 can be four. The first node component 2 closest to the bottom plate of the steel caisson 200 along the axial direction of the main body 1 can be 50mm away from the bottom plate to provide sufficient operating space for welding the main body 1 to the bottom plate. The distance between two adjacent first node components 2 can be 0.7m. The first node component 2 furthest from the bottom plate of the steel caisson 200 along the axial direction of the main body 1 can be 0.85m away from the end of the main body 1 to facilitate cutting the main body 1 after pouring concrete.
[0037] In one embodiment, please refer to Figure 1 , Figure 3 and Figure 4 The third node plate 4 is configured with an arc shape on the side closest to the steel casing 300. The radius of the arc of the third node plate 4 is equal to the radius of the steel casing 300, which allows the side of the third node plate 4 closest to the steel casing 300 to fit well against the outer circumferential surface of the steel casing 300. This increases the welding area between the third node plate 4 and the steel casing 300, thereby improving the connection strength between the third node plate 4 and the steel casing 300. For example, the material of the third node plate 4 can be Q235B, and the plate thickness of the third node plate 4 can be 20mm.
[0038] For example, the weld formed by welding between the various structures in the pressure bar device 100 can be a double-sided continuous fillet weld with a weld leg height of 16 mm.
[0039] In one embodiment, please refer to Figure 5 and Figure 6 There are multiple pressure bar devices 100, which are spaced apart on the outer periphery of the steel casing 300. For example, one steel casing 300 may correspond to four pressure bar devices 100, which are evenly spaced on the outer periphery of the steel casing 300 to further reduce the possibility of overturning due to changes in the resultant force on the steel caisson 200 during construction.
[0040] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.
Claims
1. A pressure bar device for balancing stress changes during the construction of a steel caisson cofferdam, characterized in that, include: The main body of the pressure rod is connected to the bottom plate of the steel caisson at one end along the axial direction. The main body of the pressure rod includes a first web and a first flange. There are two first flanges, and both first flanges protrude from the same side of the first web, so that the main body of the pressure rod is configured as a groove. The plane located on the side of the first web away from the first flange and parallel to the first web is the reference plane. There are multiple main bodies of the pressure rod, and the multiple main bodies of the pressure rod are symmetrically arranged about the reference plane. The space between two main bodies of the pressure rod is a reinforcement gap. The first node member includes a second web and a second flange. There are two second flanges, and both second flanges protrude from both sides of the second web, so that the first node member is configured in an H shape. The second web can be disposed within the reinforcement gap, and the two second flanges can restrict the displacement of part of the structure of the compression bar body. The third node plate is configured to be connected to one end of the pressure bar body that is axially away from the bottom plate of the steel caisson and the steel casing, respectively, so that the pressure bar device can be connected to the bottom plate of the steel caisson and the steel casing, respectively.
2. The pressure bar device for balancing the force changes of a steel caisson cofferdam during construction, as described in claim 1, is characterized in that... The pressure bar device includes a second node plate, at least a portion of which is disposed within the reinforcement gap. The second node plate is connected to the third node plate and the steel casing, respectively.
3. The pressure bar device for balancing the force changes of a steel caisson cofferdam during construction, as described in claim 1, is characterized in that... The number of the first node components is multiple, and the multiple first node components are arranged at intervals along the axial direction of the pressure bar body.
4. The pressure bar device for balancing the stress changes of a steel caisson cofferdam during construction, as described in claim 1, is characterized in that... The third node plate is configured in an arc shape on the side closest to the steel casing, and the radius of the arc of the third node plate is equal to the radius of the steel casing.
5. The pressure bar device for balancing the force changes of a steel caisson cofferdam during construction, as described in any one of claims 1 to 4, is characterized in that... The number of pressure rod devices is multiple, and the multiple pressure rod devices are arranged at intervals on the outer periphery of the steel casing.