A double-walled steel cofferdam structure and its construction method
By installing a waterstop plate and filling it with water-stopping material between the main bodies of the double-walled steel cofferdam, the problems of complex construction and difficult disassembly at the lock joint were solved, achieving a highly efficient water-stopping effect and a simplified construction process, thus reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA RAILWAY MAJOR BRIDGE ENG GRP CO LTD
- Filing Date
- 2023-03-31
- Publication Date
- 2026-05-26
AI Technical Summary
The construction of double-walled steel cofferdams is complex at the lock joint, and dismantling them later is difficult, which affects the construction progress and increases costs.
A waterstop plate is installed between the main bodies of the double-walled steel cofferdam, and the movement of the waterstop plate is restricted by a limiting component. The gap is filled by the waterstop filling part to achieve the waterstop effect, avoiding the need for interlocking connections and simplifying the construction process.
It achieves a highly efficient water-stopping effect, simplifies the construction process, and reduces construction difficulty and cost.
Smart Images
Figure CN116180779B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of cofferdam construction technology, specifically to a double-walled steel cofferdam structure and its construction method. Background Technology
[0002] As my country's infrastructure construction scale gradually expands, the number of bridges spanning rivers and seas is increasing, and underwater foundations are an indispensable part of the construction process. Underwater foundations present a challenge in bridge construction. Cofferdams can prevent soil and water from entering the construction site, providing a dry environment for foundation excavation and foundation construction, and are increasingly favored by various organizations.
[0003] Due to factors such as lifting equipment, water transport, and on-site construction techniques, double-walled steel cofferdams are generally fabricated in sections, assembled and welded on-site into a whole, and then lowered to the design location. Alternatively, they can be fabricated as a whole in a factory, transported to the pier, and then lifted to the design location by a large floating crane. Currently, in similar projects, double-walled steel cofferdams are prefabricated in sections and connected as a whole at the interlocking joints. However, in related technologies, the process at the interlocking joints of double-walled cofferdams is relatively complex, and the difficulty in controlling precision places high demands on the technical skills of on-site construction personnel. On the other hand, when dismantling the cofferdam, it is often difficult to separate adjacent sections to achieve a better water-stopping effect, thus increasing the workload and affecting the construction progress. In actual projects, the complex construction process and high difficulty in dismantling and assembling the water-stopping structure between cofferdam segments have become the main challenges in the construction of underwater piers. Summary of the Invention
[0004] To address the problems of complex construction and difficult dismantling at the interlocking joint of double-walled steel cofferdams in related technologies, which leads to extended construction periods and increased costs, this invention provides a double-walled steel cofferdam structure comprising:
[0005] At least two cofferdam bodies are provided, spaced apart on the riverbed, to form a water-stopping space between the two cofferdam bodies;
[0006] A waterstop plate is inserted into the riverbed and is located within the waterstop space;
[0007] A limiting component is assembled on the two main bodies of the cofferdam, and the limiting component is used to restrict the movement of the waterstop plate in the waterstop space;
[0008] A water-stopping filling part is filled within the water-stopping space to fill the gap between the water-stopping plate and the two main bodies of the cofferdam.
[0009] In some embodiments, the limiting component includes:
[0010] The first limiting part is connected to the main body of the cofferdam, and the first limiting part corresponds to the side of the waterstop plate near the inner side of the main body of the cofferdam.
[0011] The second limiting part is connected to the main body of the cofferdam, and the position of the second limiting part corresponds to the side of the waterstop plate near the outer side of the main body of the cofferdam.
[0012] In some embodiments, the first limiting part includes at least two first limiting plates, one end of which is attached to the outer wall surface of one of the cofferdam bodies, and the other end extends beyond the edge of the cofferdam body and corresponds to the position of the waterstop plate.
[0013] In some embodiments, the two first limiting plates are symmetrically arranged on the two cofferdam bodies, and the portions of the two first limiting plates that extend beyond the edge of the cofferdam body do not exceed the centerline of the water-stopping space in the length direction of the cofferdam body.
[0014] In some embodiments, the second limiting part includes two second limiting plates connected to the main body of the cofferdam, and the two second limiting plates are symmetrically arranged within the water-stopping space.
[0015] In some embodiments, the axial section of the waterstop is H-shaped, and the openings of the axial grooves on both sides of the waterstop correspond to the main body of the cofferdam.
[0016] In some embodiments, the water-stopping filling portion includes:
[0017] The first filling unit is filled between the waterstop plate and the main body of the cofferdam;
[0018] The second filling unit fills the water-stopping space on the side of the water-stopping plate near the inner wall of the cofferdam body.
[0019] In some embodiments, a sealing concrete is laid on the riverbed at the bottom of the water-stopping space, and the sealing concrete is anchored to the water-stopping plate.
[0020] On the other hand, this application provides a construction method for a double-walled steel cofferdam structure, which includes the following steps:
[0021] Limiting components are installed on the two main bodies of the cofferdam, and the two main bodies of the cofferdam are placed at a predetermined position on the riverbed;
[0022] A waterstop plate is inserted into the riverbed of the water-stopping space between the two main cofferdams, and bottom sealing concrete is poured into the riverbed to anchor the waterstop plate.
[0023] The water-stopping space is filled with a water-stopping filling part.
[0024] In some embodiments, filling the water-stopping space with the water-stopping filling part includes:
[0025] Fill the space between the waterstop and the main body of the cofferdam with dry-mixed cement sandbags or mortar;
[0026] The water-stopping space on the side of the water-stopping plate closest to the inner wall of the cofferdam is filled with water-stopping clay.
[0027] Compared with the prior art, the present invention installs a waterstop plate as the main waterstop component in the gap between the double-walled steel cofferdams, and fills the gap with waterstop material to prevent water leakage in the waterstop space. The double-walled steel cofferdam structure in this application can achieve the purpose of waterstopping the cofferdam efficiently and simply. Moreover, since the waterstop plate is not connected to the double-walled steel cofferdam, it is easier for construction personnel to remove it later, thereby effectively shortening the construction period and reducing costs. Attached Figure Description
[0028] 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.
[0029] Figure 1 This is a top view of the double-walled steel cofferdam structure in an embodiment of the present invention;
[0030] Figure 2 This is a cross-sectional view of the double-walled steel cofferdam structure in an embodiment of the present invention.
[0031] In the diagram: 1. Main body of the cofferdam; 11. Water-stopping space; 111. Bottom sealing concrete; 12. Cofferdam wall panel; 13. Enclosed partition; 2. Riverbed; 3. Limiting components; 31. First limiting part; 311. First limiting plate; 32. Second limiting part; 321. Second limiting plate; 4. Water-stopping plate; 5. Water-stopping filling part; 51. First filling unit; 52. Second filling unit. Detailed Implementation
[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0033] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Addressing the problem in related technologies where the construction of double-walled steel cofferdams for water-stopping is difficult to achieve both effective water-stopping and ease of assembly and disassembly, such as... Figure 1As shown, this application provides a double-walled steel cofferdam structure, which includes: at least two cofferdam bodies 1, a waterstop plate 4, a limiting component 3, and a waterstop filling part 5; wherein,
[0034] At least two cofferdam bodies 1 are spaced apart on the riverbed 2 to form a water-stopping space 11 between the two cofferdam bodies 1; a water-stopping plate 4 is inserted into the riverbed 2 and is located in the water-stopping space 11 between the two cofferdam bodies 1; a limiting component 3 is assembled on the two cofferdam bodies 1 and is used to restrict the movement of the water-stopping plate 4 in the water-stopping space; and a water-stopping filling part 5 is filled in the water-stopping space 11 to fill the gap between the water-stopping plate 4 and the two cofferdam bodies 1.
[0035] It is understandable that the double-walled cofferdam in this application does not require a complex interlocking connection between the main bodies 1. Instead, after both are lowered to a predetermined position on the riverbed, a water-stopping space 11 is reserved between them. A water-stopping plate 4 is installed in the water-stopping space 11 as the main water-stopping component, and then a water-stopping filling part 5 is filled into the water-stopping space 11 to cooperate with the water-stopping plate 4 to achieve the water-stopping effect. Furthermore, in order to prevent the water-stopping plate 4 from moving and detaching from the water-stopping space 11 due to water flow impact, causing leakage at the interlocking point of the double-walled cofferdam, limiting components 3 are provided on the two main bodies 1 of the cofferdam in this application to limit the water-stopping plate 4 in the X direction to avoid accidents. It should be noted that... Figure 1 In a top-down view, the X direction refers to the thickness of the main body of the cofferdam.
[0036] In some preferred embodiments, the limiting component 3 includes: a first limiting part 31 and a second limiting part 32; wherein,
[0037] The first limiting part 31 is connected to the main body 1 of the cofferdam, and the first limiting part 31 corresponds to the side of the waterstop plate 4 near the inner side of the main body 1 of the cofferdam; the second limiting part 32 is connected to the main body 1 of the cofferdam, and the second limiting part 32 corresponds to the side of the waterstop plate 4 near the outer side of the main body 1 of the cofferdam.
[0038] Specifically, the first limiting part 31 corresponds in the X-direction to the side of the waterstop plate 4 near the inner side of the cofferdam body 1. The second limiting part 32 corresponds in the X-direction to the side of the waterstop plate 4 near the outer side of the cofferdam body 1.
[0039] It is understandable that the first limiting part 31 and the second limiting part 32 correspond to the symmetrical positions on both sides of the waterstop plate 4, that is, to prevent the waterstop plate 4 from leaving the waterstop space 11 from inside and outside the cofferdam wall.
[0040] Specifically, the first limiting part 31 includes at least two first limiting plates 311, one end of which is attached to the outer wall surface of one of the cofferdam bodies 1, and the other end extends beyond the edge of the cofferdam body 1 and is flush with the waterstop plate 4 on the cofferdam body 1. Figure 1 The position corresponds in the X direction.
[0041] Preferably, the first limiting part 31 includes multiple first limiting plates 311, with each pair of first limiting plates 311 symmetrically arranged on the two cofferdam bodies 1. Each group is spaced apart in the height direction, and each group corresponds to a horizontal ring on the cofferdam body 1 (multiple horizontal rings are spaced apart along the height direction on the cofferdam body 1; the horizontal rings are an inherent structure of the cofferdam body). Determining the installation position of the limiting plates using the horizontal rings makes positioning more accurate and construction more convenient.
[0042] Furthermore, the two first limiting plates 311 are symmetrically arranged on the two cofferdam bodies 1, as follows: Figure 1 As shown, the portions of the two first limiting plates 311 that extend beyond the edge of the cofferdam body 1 do not exceed the centerline of the water-stopping space 11 in the length direction of the cofferdam body 1.
[0043] It is understood that the outer wall of the cofferdam body 1 (i.e., the side closest to the river) is provided with a cofferdam wall panel 12, which extends into the water-stopping space 11, and the extended portion does not exceed the central axis of the water-stopping space 11 in the length direction of the cofferdam body 1. The cofferdam wall panel 12 is welded to the first limiting plate 311.
[0044] In some specific embodiments, the second limiting part 32 includes two second limiting plates 321, which are connected to the cofferdam body 1, and the two second limiting plates 321 are symmetrically arranged in the water-stopping space 11.
[0045] In some embodiments, each second limiting plate 321 is arranged along the entire length of the cofferdam body 1 in the height direction.
[0046] Preferably, the second limiting part 32 includes a plurality of second limiting plates 321, with each pair of second limiting plates 321 arranged symmetrically within the water-stop space 11. The plurality of sets of second limiting plates 321 are spaced apart in the height direction, and each set corresponds to a horizontal ring position.
[0047] Similarly, closed partitions 13 are provided on the opposite surfaces of the two cofferdam bodies 1, and limiting components are welded on the closed partitions 13. The limiting components are welded to the second limiting plate 321.
[0048] Preferably, the axial section of the waterstop plate 4 is H-shaped, and the openings of the axial grooves on both sides of the waterstop plate 4 correspond to the cofferdam body 1. Optionally, the waterstop plate 4 is made of I-beams, which include steel flanges and steel webs, and the axial grooves formed by the two steel flanges and the steel webs are opposite to the cofferdam body 1. Generally, the overlap length of the steel flanges and the extension of the cofferdam wall plate 12 into the waterstop space 11 along the length of the cofferdam body 1 should not be less than 50 mm.
[0049] In some specific embodiments, the water-stopping filling part 5 includes: a first filling unit 51 and a second filling unit 52; wherein,
[0050] The first filling unit 51 fills the space between the waterstop plate 4 and the cofferdam body 1; the second filling unit 52 fills the waterstop space 11 located on the side of the waterstop plate 4 near the inner wall of the cofferdam body 1.
[0051] It should be noted that the first filling unit 51 can be made of dry-mixed cement sandbags or mortar. For ease of removal, the second filling unit 52 can be made of clay. Therefore, the waterstop 4 not only has a sealing function, preventing large amounts of water from entering, but also serves to divide the area; the area within the waterstop 4 is the first filling unit 51, while the area extending from the waterstop 4 towards the cofferdam uses the second filling unit 52.
[0052] In some preferred embodiments, such as Figure 2 As shown, a bottom sealing concrete 111 is laid on the riverbed 2 at the bottom of the water-stopping space 11, and the bottom sealing concrete 111 is anchored to the water-stopping plate 4. It should be noted that when the cofferdam needs to be dismantled after use, the construction personnel only need to cut the underwater bottom sealing concrete 111, and then the floating crane can dismantle the main body 1 of the cofferdam in sections to complete the dismantling.
[0053] On the other hand, this application provides a construction method for a double-walled steel cofferdam structure, which includes the following steps:
[0054] S1. Install limiting components 3 on the two cofferdam bodies 1 and place the two cofferdam bodies 1 at preset positions on the riverbed 2.
[0055] Specifically, the limiting component 3 is first welded onto the main body 1 of the cofferdam, and then the two adjacent main bodies 1 of the cofferdam are installed to the designed position.
[0056] S2. A waterstop plate 4 is inserted into the riverbed 2 of the waterstop space 11 between the two cofferdam bodies 1, and bottom sealing concrete 111 is poured into the riverbed 2 to anchor the waterstop plate 4.
[0057] Insert the water-stop plate 4 into the water-stop space 11 up to the top of the riverbed 2. Pour the bottom sealing concrete 111, and pump out the water after the bottom sealing concrete 111 reaches the design strength.
[0058] S3. Fill the water-stopping space 11 with the water-stopping filling part 5.
[0059] Specifically, step S3 includes: filling the space between the waterstop plate 4 and the cofferdam body 1 with dry-mixed cement sandbags or mortar; and filling the waterstop space 11 on the side of the waterstop plate 4 near the inner wall of the cofferdam body 1 with waterstop clay.
[0060] In summary, this invention uses a waterstop plate installed in the gap between the double-walled steel cofferdams as the main waterstop component, and fills the gap with waterstop material to prevent water leakage in the waterstop space. The double-walled steel cofferdam structure in this application can efficiently and easily achieve the purpose of waterstopping the cofferdam. Moreover, since the waterstop plate is not connected to the double-walled steel cofferdam, it is easier for construction personnel to remove it later, thereby effectively shortening the construction period and reducing costs.
[0061] 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.
[0062] 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.
[0063] 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 structure, characterized in that, include: At least two cofferdam bodies (1) are spaced apart on the riverbed (2) to form a water-stopping space (11) between the two cofferdam bodies (1). A waterstop plate (4) is inserted into the riverbed (2) and the waterstop plate (4) is located in the waterstop space (11); A limiting component (3) is assembled on the two cofferdam bodies (1), and the limiting component (3) is used to restrict the movement of the waterstop plate (4) in the waterstop space (11); A water-stopping filling part (5) is filled in the water-stopping space (11) to fill the gap between the water-stopping plate (4) and the two cofferdam bodies (1); The axial section of the waterstop plate (4) is H-shaped, and the opening orientation of the axial grooves on both sides of the waterstop plate (4) corresponds to the main body (1) of the cofferdam. The limiting component (3) includes: The first limiting part (31) is connected to the main body of the cofferdam (1), and the first limiting part (31) corresponds to the side of the waterstop plate (4) near the inner side of the main body of the cofferdam (1); The second limiting part (32) is connected to the main body of the cofferdam (1), and the second limiting part (32) corresponds to the side of the waterstop plate (4) near the outside of the main body of the cofferdam (1); The first limiting part (31) includes at least two first limiting plates (311), one end of the first limiting plate (311) is attached to the outer wall surface of one of the cofferdam bodies (1), and the other end extends beyond the edge of the cofferdam body (1) and corresponds to the position of the waterstop plate (4); The second limiting part (32) includes: two second limiting plates (321), which are connected to the main body of the cofferdam (1), and the two second limiting plates (321) are symmetrically arranged in the water-stopping space (11); The water-stopping filling part (5) includes: The first filling unit (51) is filled between the waterstop plate (4) and the cofferdam body (1); The second filling unit (52) fills the water-stopping space (11) on the side of the water-stopping plate (4) near the inner wall of the cofferdam body (1).
2. The double-walled steel cofferdam structure as described in claim 1, characterized in that, Two first limiting plates (311) are symmetrically arranged on the two cofferdam bodies (1), and the portions of the two first limiting plates (311) that extend beyond the edge of the cofferdam body (1) do not exceed the center line of the water-stopping space (11) in the length direction of the cofferdam body (1).
3. The double-walled steel cofferdam structure as described in claim 1, characterized in that, Sealing concrete (111) is laid on the riverbed (2) at the bottom of the water-stopping space (11), and the sealing concrete (111) is anchored to the water-stopping plate (4).
4. A construction method for a double-walled steel cofferdam structure, based on the double-walled steel cofferdam structure as described in any one of claims 1-3, characterized in that, Includes the following steps: Install limiting components (3) on the two main bodies (1) of the cofferdam, and place the two main bodies (1) of the cofferdam on the riverbed (2) at a predetermined position; A waterstop plate (4) is inserted on the riverbed (2) of the waterstop space (11) between the two main bodies of the cofferdam (1), and bottom sealing concrete (111) is poured into the riverbed (2) to anchor the waterstop plate (4). The water-stopping space (11) is filled with the water-stopping filling part (5).
5. The construction method as described in claim 4, characterized in that, The process of filling the water-stopping space (11) with the water-stopping filling part (5) includes: Fill the space between the waterstop plate (4) and the main body of the cofferdam (1) with dry-mixed cement sandbags or mortar; The water-stopping space (11) on the side of the water-stopping plate (4) close to the inner wall of the cofferdam body (1) is filled with water-stopping clay.