A firm device for a pipe pile cofferdam and a construction method thereof

Abstract

The present application relates to the technical field of pipe pile cofferdam, and particularly relates to a pipe pile cofferdam stabilizing device. The pipe pile cofferdam stabilizing device comprises a pipe pile, a cross beam and a longitudinal beam, a plurality of pipe piles are vertically inserted into a mud surface and are arranged in parallel and at intervals into two rows, the space between the two rows of pipe piles is a cofferdam accommodating space, a plurality of cross beams are arranged in parallel and at intervals, the bottom of the plurality of cross beams is slotted along the length direction and the bottom slot is embedded into the mud surface downward, each cross beam simultaneously penetrates through the two rows of pipe piles and is perpendicular to the extension direction of the cofferdam accommodating space, two longitudinal beams are arranged on the two sides of the extension direction of the cofferdam accommodating space, and the longitudinal beams extend along the extension direction of the single row of pipe piles, the longitudinal beams are connected with the cross beams above the cross beams, and the overlapping fasteners on the pipe piles are fastened on the top of the longitudinal beams. The pipe pile cofferdam stabilizing device is low in cost and can enhance the stability of the cofferdam.

Description

Technical Field

[0001] This invention relates to the field of pipe pile cofferdam technology, and in particular to a stabilizing device for pipe pile cofferdams, and a method for constructing pipe pile cofferdams using the stabilizing device. Background Technology

[0002] With the rapid development of water conservancy projects, more and more hydraulic structures face complex construction conditions, such as poor foundation conditions, especially the presence of deep silt layers beneath the structures. The impact of deep silt layers on the cofferdam structure is even more pronounced when constructing large-scale cofferdams in lake areas or along rivers.

[0003] Constrained by factors such as construction period, investment, flood control, navigation and surrounding environment requirements, the cofferdam structure must not only meet the requirements of water retention, ensure construction safety, facilitate construction, minimize the construction time of cofferdam filling and enable the cofferdam structure to be put into use as soon as possible, but also save investment, minimize the encroachment on the water area in the cross section, and reduce the impact on flood control safety during the flood season.

[0004] In commonly used cofferdam structures with small cross-section pipe piles, the presence of a deep, weak silt layer in the underlying foundation often leads to significant cofferdam settlement and makes it difficult to meet stability requirements. Therefore, it is necessary to increase the length of the pipe piles and the cross-section of the cofferdam, and to construct a wider earth-filled retaining wall on the inner side of the cofferdam to meet stability and settlement requirements. However, increasing the length of the pipe piles, enlarging the cofferdam cross-section, and constructing the earth-filled retaining wall all increase the engineering cost of the cofferdam, which contradicts the principle of minimizing investment in cofferdam structures. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a cost-effective stabilization device for pipe pile cofferdams that enhances their stability.

[0006] The present invention adopts the following technical solution:

[0007] This invention provides a stabilizing device for a pipe pile cofferdam, comprising pipe piles, crossbeams, and longitudinal beams. Multiple pipe piles are vertically inserted into the mud surface and arranged in two parallel rows at intervals. The space between the two rows of pipe piles is the cofferdam accommodating space. Multiple crossbeams are arranged in parallel at intervals. The bottom of each crossbeam is slotted along its length and embedded into the mud surface with the bottom slot facing downwards. Each crossbeam passes through two rows of pipe piles simultaneously and is perpendicular to the extension direction of the cofferdam accommodating space. Two longitudinal beams are respectively arranged on both sides of the extension direction of the cofferdam accommodating space and extend along the extension direction of a single row of pipe piles. The longitudinal beams are connected to the crossbeams above the crossbeams, and the overlapping fasteners on the pipe piles are fastened to the top of the longitudinal beams.

[0008] Preferably, it also includes extended crossbeams, with two extended crossbeams symmetrically arranged at both ends of the cofferdam's accommodating space. Each extended crossbeam passes through two rows of pipe piles and is perpendicular to the extension direction of the cofferdam's accommodating space. Each extended crossbeam is connected to a wire rope sling at both ends along its length.

[0009] Preferably, in a single row of pipe piles, the spacing between adjacent pipe piles is the same, and the crossbeam passes through the gap between adjacent pipe piles.

[0010] Preferably, the crossbeam and the longitudinal beam are of equal length, and both the crossbeam and the longitudinal beam have multiple mounting holes along their length according to their overlapping positions. The longitudinal beam is threadedly connected to the crossbeam through the mounting holes.

[0011] Preferably, the longitudinal beam is positioned close to the pipe pile, and there is a gap between the longitudinal beam and the pipe pile.

[0012] The present invention also provides a method for constructing a pipe pile cofferdam, employing a pipe pile cofferdam stabilization device as described in any of the preceding claims, and comprising the following steps:

[0013] S1: Measure the terrain at the cofferdam installation site and determine the location of the pipe pile cofferdam stabilization device accordingly;

[0014] S2: Level the mud surface at the determined location of the pipe pile cofferdam stabilization device, and then determine the specifications and dimensions of the pipe pile cofferdam stabilization device based on the mud surface elevation at the leveled location.

[0015] S3: Based on the determined specifications and dimensions of the pipe pile cofferdam stabilization device, fabricate and install the pipe pile cofferdam stabilization device at the determined location.

[0016] S4: Lay bamboo mats, impermeable membranes, or geotextiles on the two inner side walls and the bottom of the cofferdam's containment space, and connect and fix them with walers and tie rods at the top of the cofferdam's containment space. Then fill the interior of the cofferdam's containment space with soil to form a cofferdam.

[0017] Preferably, step S3 includes the following steps:

[0018] S31: Based on the mud surface elevation of the leveled layout location, determine the depth of the pipe pile insertion into the mud surface, thereby dividing the pipe pile into a lower mud section and an upper mud section, and setting the lap fasteners near the lower mud section of the pipe pile.

[0019] S32: Multiple crossbeams and two extended crossbeams are arranged in parallel at intervals, and two longitudinal beams are symmetrically arranged at both ends of the crossbeams. Each crossbeam is perpendicular to both longitudinal beams at the same time, and the longitudinal beams are connected to the crossbeams above the crossbeams to form a grid structure.

[0020] S33: Set the grid structure at the designated location of the pipe pile cofferdam stabilization device, and embed the bottom of the crossbeam downward into the mud surface. Then, set multiple pipe piles in parallel intervals in two rows and vertically insert them into the arrangement position. The mud section of each pipe pile is inserted into the mud surface of the arrangement position, and the overlapping fastener is fastened to the top of the longitudinal beam. The single crossbeam is located in the gap between adjacent pipe piles in a single row of pipe piles.

[0021] Preferably, in step S33, the arrangement position of the grid structure is first determined at the determined arrangement position of the pipe pile cofferdam stabilization device, and then four positioning pipe piles are inserted diagonally into the mud surface for positioning. Then, the grid structure is set at the determined grid structure arrangement position using steel wire rope slings, and the bottom groove of the crossbeam is embedded into the mud surface with the bottom facing downwards. Each extended crossbeam is close to two positioning pipe piles respectively. Then, other pipe piles are driven onto the grid structure.

[0022] Preferably, in step S4, after filling the interior of the cofferdam's containment space with soil, if the elevation of the cofferdam is lower than the design elevation, bagged soil is added to the top of the cofferdam until the elevation of the cofferdam reaches the design elevation.

[0023] Preferably, in step S4, after the soil is filled into the interior of the cofferdam's containment space, the wire rope sling is tightened and fixed to the positioning pipe pile and the waler.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] The pipe pile cofferdam stabilization device of this invention can limit the skew deformation of the pipe piles to the outside of the cofferdam's containment space through the longitudinal beams, and limit the offset of the pipe piles along the extension direction of the cofferdam's containment space through the transverse beams. The overlapping fasteners fastened to the longitudinal beams provide bearing capacity for the pipe piles. The bottom of the transverse beams is grooved along its length and embedded downwards into the mud surface, thus effectively increasing the bearing capacity of the lower silt on the cofferdam after it is formed within the containment space. The wire rope sling serves as a lifting device for installation and dismantling. During the use of the cofferdam, the movable end of the wire rope is fixed to the positioning pipe piles and their walers, which enhances the overturning resistance of the cofferdam body and improves its stability. Furthermore, since it eliminates the need to lengthen the pipe piles, increase the cofferdam cross-section, or construct a wider backfill channel inside the cofferdam, the manufacturing cost is low, which is conducive to its widespread use.

[0026] The construction method of the pipe pile cofferdam of the present invention naturally has the above-mentioned beneficial effects due to the use of the above-mentioned pipe pile cofferdam stabilization device. Attached Figure Description

[0027] Figure 1 This is a plan view of the pipe pile cofferdam stabilization device in an embodiment of the present invention.

[0028] Figure 2This is a cross-sectional view of the pipe pile cofferdam stabilization device in an embodiment of the present invention.

[0029] Figure 3 This is a longitudinal cross-sectional view of the pipe pile cofferdam stabilization device in an embodiment of the present invention.

[0030] The reference numerals in the attached figures are explained as follows:

[0031] 1. Pipe piles; 4. Cofferdam containment space

[0032] 11. Overlapping fasteners; 5. Extended crossbeams

[0033] 12. Subsurface section 6. Wire rope sling

[0034] 13. Mud section 7. Mud surface

[0035] 2. Crossbeam 8. Positioning pipe piles

[0036] 3. Longitudinal beams Detailed Implementation

[0037] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0038] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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; 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 invention according to the specific circumstances.

[0040] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0041] See Figures 1 to 3This embodiment provides a pipe pile cofferdam stabilization device, including pipe piles 1, crossbeams 2 and longitudinal beams 3. Multiple pipe piles 1 are vertically inserted into the mud surface 7 and arranged in two parallel rows. The space between the two rows of pipe piles 1 is the cofferdam accommodating space 4. Multiple crossbeams 2 are arranged in parallel at intervals. The bottom of the multiple crossbeams 2 is slotted along the length direction and the bottom slot is embedded into the mud surface 7 with the bottom slot facing downward. Each crossbeam 2 passes through two rows of pipe piles 1 and is perpendicular to the extension direction of the cofferdam accommodating space 4. Two longitudinal beams 3 are respectively arranged on both sides of the extension direction of the cofferdam accommodating space 4, and the longitudinal beams 3 extend along the extension direction of the single row of pipe piles 1. The longitudinal beams 3 are connected to the crossbeams 2 above the crossbeams 2. The overlapping fasteners 11 on the pipe piles 1 are fastened to the top of the longitudinal beams 3.

[0042] The pipe pile cofferdam stabilization device of this embodiment can limit the skew deformation of the pipe pile 1 to the outside of the cofferdam accommodating space 4 through the longitudinal beam 3, and limit the offset of the pipe pile 1 along the extension direction of the cofferdam accommodating space 4 through the transverse beam 2. The overlapping fastener 11 is fastened to the longitudinal beam 3, which can provide bearing capacity for the pipe pile 1. The bottom of the transverse beam 2 is slotted along the length direction and the bottom slot is embedded downward into the mud surface 7, so that after the cofferdam is formed in the cofferdam accommodating space 4, the bearing capacity of the lower silt on the cofferdam can be effectively increased, thereby enhancing the stability of the cofferdam. At the same time, since it is no longer necessary to lengthen the pipe pile 1, increase the cross-section of the cofferdam, or fill a wider backfill channel inside the cofferdam, the manufacturing cost is low, which is conducive to its widespread use.

[0043] Preferably, both the crossbeam 2 and the longitudinal beam 3 are made of engineering plastics. Because engineering plastics are lightweight, high-strength, and inexpensive, using engineering plastics to manufacture the crossbeam 2 and longitudinal beam 3, with the groove of the crossbeam 2 facing downwards during installation, can better improve the bearing capacity of the lower silt on the cofferdam and reduce the manufacturing cost of the pipe pile cofferdam stabilization device in this embodiment.

[0044] Preferably, in this embodiment, both the crossbeam 2 and the longitudinal beam 3 are made of engineering plastics according to the specifications of 20# channel steel, and are cut and used.

[0045] It should be noted that, in this embodiment, in order to make the connection between the crossbeam 2 and the longitudinal beam 3 tighter, the groove of the longitudinal beam 3 is connected to the top surface of the lower crossbeam 2 with the groove facing upward.

[0046] Preferably, see Figure 1 The pipe pile cofferdam stabilization device in this embodiment also includes an extended crossbeam 5. Two extended crossbeams 5 are symmetrically arranged at both ends of the extension direction of the cofferdam accommodating space 4. Each extended crossbeam 5 passes through two rows of pipe piles 1 and is perpendicular to the extension direction of the cofferdam accommodating space 4. Steel wire rope slings 6 are connected to both ends of the length direction of each extended crossbeam 5.

[0047] The free end of the wire rope sling 6 can be used as a lifting point when lifting the grid structure composed of the longitudinal beam 3, the transverse beam 2 and the extended transverse beam 5; after the cofferdam is constructed, the free end of the wire rope sling 6 can also be connected to the positioning pipe pile 8 of the cofferdam and its waler for fixation.

[0048] Preferably, in this embodiment, an extended crossbeam 5 is symmetrically provided at each of the two ends of the cofferdam accommodating space 4 at 1 / 4 of its extension direction.

[0049] Specifically, in this embodiment, in order to better lift the grid structure composed of the longitudinal beam 3, the transverse beam 2 and the extended transverse beam 5, the free end of the wire rope sling 6 is provided with a hook, which is used as a lifting point during lifting.

[0050] Preferably, see Figure 1 In a single row of pipe piles 1, the spacing between adjacent pipe piles 1 is the same, and the crossbeam 2 passes through the gap between adjacent pipe piles 1. The equidistant spacing between adjacent pipe piles 1 in a single row of pipe piles 1 ensures that the crossbeam 2 effectively restricts the offset of the pipe piles 1 along the extension direction of the cofferdam accommodating space 4.

[0051] It should be noted that, in this embodiment, the spacing between adjacent crossbeams 2 is an integer multiple of the spacing between adjacent pipe piles 1 in a single row of pipe piles 1, so that the number of crossbeams 2 passing through the pipe piles 1 can be temporarily increased or decreased as needed.

[0052] Preferably, the crossbeam 2 and the longitudinal beam 3 are of equal length, and both the crossbeam 2 and the longitudinal beam 3 have multiple mounting holes along their length according to their overlapping positions. The longitudinal beam 3 is threadedly connected to the crossbeam 2 through the mounting holes. Thus, the crossbeam 2 and the longitudinal beam 3 can be used interchangeably.

[0053] Preferably, the longitudinal beam 3 is positioned close to the pipe pile 1, and there is a gap between the longitudinal beam 3 and the pipe pile 1, so as to avoid the longitudinal beam 3 squeezing and displacing the pipe pile 1, so that the cofferdam formed in the cofferdam accommodating space 4 is inconsistent with the design dimensions.

[0054] With its grid structure formed by connecting longitudinal beams 3 and transverse beams 2, the channel steel component shape of transverse beams 2, and steel wire rope slings 6, combined with the overlapping fasteners 11 added to the pipe piles 1, this pipe pile cofferdam stabilization device can effectively increase the bearing capacity of the pipe piles 1 and the cofferdam body, reduce the length of the pipe piles 1 and the settlement of the cofferdam. The longitudinal beams 3 can limit the skew deformation of the pipe piles 1 to the outside of the cofferdam accommodating space 4, and the transverse beams 2 can limit the offset of the pipe piles 1 along the extension direction of the cofferdam accommodating space 4. The entire grid structure can improve the construction accuracy of the pipe piles 1 and effectively increase the stability of the dam body and embankment corners during the operation of the cofferdam.

[0055] This stabilizing device has a simple structure, is easy to install and disassemble, and is convenient for storage and transportation. When used in conjunction with pipe pile cofferdams on deep soft foundations, it can effectively reduce the cross-section and settlement of the cofferdam, enhance the stability of the cofferdam, and reduce the project cost.

[0056] This embodiment also provides a method for constructing a pipe pile cofferdam, which employs the aforementioned pipe pile cofferdam stabilization device and includes the following steps:

[0057] S1: Measure the terrain at the cofferdam installation site and determine the location of the pipe pile cofferdam stabilization device accordingly;

[0058] S2: Level the mud surface at the determined location of the pipe pile cofferdam stabilization device, and then determine the specifications and dimensions of the pipe pile cofferdam stabilization device based on the mud surface elevation at the leveled location.

[0059] S3: Based on the determined specifications and dimensions of the pipe pile cofferdam stabilization device, fabricate and install the pipe pile cofferdam stabilization device at the determined location.

[0060] S4: Bamboo mats, impermeable membranes or geotextiles are laid on the two inner side walls and the bottom of the cofferdam containment space 4, and the upper part of the cofferdam containment space 4 is connected and fixed with walers and tie rods. Then, soil is filled into the cofferdam containment space 4 to form a cofferdam.

[0061] The construction method of the pipe pile cofferdam in this embodiment can limit the skew deformation of the pipe pile 1 to the outside of the cofferdam's accommodating space 4 by using the longitudinal beam 3, and limit the offset of the pipe pile 1 along the extension direction of the cofferdam's accommodating space 4 by using the transverse beam 2. This method can improve the construction accuracy of the pipe pile 1 and effectively increase the stability of the dam body and embankment corners during the cofferdam construction process. The bottom of the transverse beam 2 is grooved along its length and embedded into the mud surface 7 with the bottom groove facing downwards. This effectively increases the bearing capacity of the lower silt on the cofferdam after the cofferdam is formed within the cofferdam's accommodating space 4, thereby enhancing the stability of the cofferdam. At the same time, since it is no longer necessary to lengthen the pipe pile 1, increase the cofferdam cross-section, or fill a wider earthwork channel inside the cofferdam, the manufacturing cost is low, which is conducive to its widespread use.

[0062] Preferably, step S3 includes the following steps, see below. Figures 1 to 3 :

[0063] S31: Based on the mud surface elevation of the leveled and arranged position, determine the depth of the pipe pile 1 inserted into the mud surface 7, thereby dividing the pipe pile 1 into the lower mud section 12 and the upper mud section 13, and setting the overlapping fastener 11 near the lower mud section 12 of the pipe pile 1.

[0064] S32: Multiple crossbeams 2 and two extended crossbeams 5 are arranged in parallel at intervals, and two longitudinal beams 3 are symmetrically arranged at both ends of the crossbeams 2. Each crossbeam 2 is perpendicular to the two longitudinal beams 3 at the same time. The longitudinal beams 3 are connected to the crossbeams 2 above the crossbeams 2 to form a grid structure.

[0065] S33: The grid structure is set at the determined location of the pipe pile cofferdam stabilization device, and the bottom of the crossbeam 2 is embedded into the mud surface 7 with the bottom facing downward. Then, multiple pipe piles 1 are arranged in parallel and spaced in two rows and vertically inserted into the arrangement position. The mud section 12 of each pipe pile 1 is inserted into the mud surface 7 of the arrangement position, and the overlapping fastener 11 is fastened to the top of the longitudinal beam 3. The single crossbeam 2 is located in the gap between adjacent pipe piles 1 in a single row of pipe piles 1.

[0066] Preferably, in step S31, the overlapping fastener 11 is fixed to the pipe pile 1 near the mud section 12 by a clamp.

[0067] Preferably, in step S32, two extended crossbeams 5 are symmetrically arranged at both ends of the longitudinal beam 3, each extended crossbeam 5 is perpendicular to both longitudinal beams 3, and each extended crossbeam 5 is connected to a steel wire rope sling 6 at both ends along its length, thereby completing the assembly of the grid structure.

[0068] It should be noted that the number, length and other parameters of the grid structure can be obtained by measuring the terrain at the cofferdam installation site; and the grid structure can be continuously installed or intermittently installed at the determined location of the pipe pile cofferdam stabilization device, and the length of the longitudinal beam can be determined according to the terrain undulation.

[0069] Preferably, see Figures 1 to 3 In step S33, the arrangement position of the grid structure is first determined at the location of the determined pipe pile cofferdam stabilization device. Then, four positioning pipe piles 8 are diagonally inserted into the mud surface 7 for positioning. Then, the grid structure is set at the determined grid structure arrangement position using steel wire rope slings 6, and the bottom groove of the crossbeam 2 is embedded into the mud surface 7 with the bottom facing downward. Each extended crossbeam 5 is close to two positioning pipe piles 8. Then, other pipe piles 1 are driven onto the grid structure, thereby ensuring that the setting position of the grid structure remains unchanged during the process of driving the pipe piles 1 onto the grid structure, thereby improving the construction accuracy of the pipe piles 1 and effectively increasing the stability of the dam body and embankment corners during the cofferdam construction process.

[0070] It should be noted that the four positioning pipe piles 8 used for positioning must meet their own settlement requirements in terms of length, and no overlapping fasteners 11 are provided, or the overlapping fasteners 11 are provided below the longitudinal beam 3.

[0071] Preferably, in step S4, after filling the interior of the cofferdam accommodating space 4 with soil, if the elevation of the cofferdam is lower than the design elevation, bagged soil is added to the top of the cofferdam until the elevation of the cofferdam reaches the design elevation.

[0072] Preferably, in step S4, after the soil is filled into the interior of the cofferdam accommodating space 4, the wire rope sling 6 is tightened and fixed to the positioning pipe pile 8 and the waler, thereby enhancing the overturning resistance of the cofferdam body.

[0073] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A stabilizing device for a pipe pile cofferdam, characterized in that, The structure includes pipe piles (1), crossbeams (2), longitudinal beams (3), and extended crossbeams (5). Multiple pipe piles (1) are vertically inserted into the mud surface (7) and arranged in two parallel rows. The space between the two rows of pipe piles (1) is the cofferdam accommodating space (4). Multiple crossbeams (2) are arranged in parallel rows. The bottom of each crossbeam (2) is slotted along its length and embedded into the mud surface (7) with the slot facing downwards. Each crossbeam (2) passes through both rows of pipe piles (1) and is perpendicular to the extension direction of the cofferdam accommodating space (4). Two longitudinal beams (3) are respectively arranged on both sides of the extension direction of the cofferdam accommodating space (4), and the longitudinal beams (3) extend along the extension direction of a single row of pipe piles (1). The longitudinal beams (3) are located at... The upper part of the crossbeam (2) is connected to the crossbeam (2). The overlapping fastener (11) on the pipe pile (1) is fastened to the top of the longitudinal beam (3). The two extended crossbeams (5) are symmetrically arranged at both ends of the extension direction of the cofferdam accommodating space (4). Each extended crossbeam (5) passes through two rows of pipe piles (1) and is perpendicular to the extension direction of the cofferdam accommodating space (4). Each extended crossbeam (5) has a wire rope sling (6) connected to both ends of its length direction. The free end of the wire rope sling (6) is provided with a hook and is used as a lifting point when the grid structure composed of the longitudinal beam (3), crossbeam (2) and extended crossbeam (5) is lifted, and is tightened and fixed to the positioning pipe pile (8) and waler after the cofferdam is constructed.

2. The stabilizing device for a pipe pile cofferdam according to claim 1, characterized in that, In a single row of pipe piles (1), the spacing between adjacent pipe piles (1) is the same, and the crossbeam (2) passes through the gap between adjacent pipe piles (1).

3. The stabilizing device for a pipe pile cofferdam according to claim 1, characterized in that, The crossbeam (2) and the longitudinal beam (3) are of equal length, and both the crossbeam (2) and the longitudinal beam (3) have multiple mounting holes along their length according to their overlapping positions. The longitudinal beam (3) is threadedly connected to the crossbeam (2) through the mounting holes.

4. The stabilizing device for a pipe pile cofferdam according to claim 1, characterized in that, The longitudinal beam (3) is positioned close to the pipe pile (1), and there is a gap between the longitudinal beam (3) and the pipe pile (1).

5. A method for constructing a pipe pile cofferdam, characterized in that, The stabilizing device for the pipe pile cofferdam as described in any one of claims 1-4 includes the following steps: S1: Measure the terrain at the cofferdam installation site and determine the location of the pipe pile cofferdam stabilization device accordingly; S2: Level the mud surface at the determined location of the pipe pile cofferdam stabilization device, and then determine the specifications and dimensions of the pipe pile cofferdam stabilization device based on the mud surface elevation at the leveled location. S3: Based on the determined specifications and dimensions of the pipe pile cofferdam stabilization device, manufacture and install the pipe pile cofferdam stabilization device at the determined location. S4: Bamboo mats, impermeable membranes or geotextiles are laid on the two inner side walls and the bottom of the cofferdam containment space (4), and walers and tie rods are used to connect and fix the upper part of the cofferdam containment space (4). Then, soil is filled into the interior of the cofferdam containment space (4) to form a cofferdam.

6. The method for constructing a pipe pile cofferdam according to claim 5, characterized in that, Step S3 includes the following steps: S31: Based on the mud surface elevation of the leveled arrangement position, determine the depth of the pipe pile (1) inserted into the mud surface (7), thereby dividing the pipe pile (1) into a lower mud section (12) and an upper mud section (13), and setting the overlapping fastener (11) on the pipe pile (1) near the lower mud section (12). S32: Multiple crossbeams (2) and two extended crossbeams (5) are arranged in parallel intervals, and two longitudinal beams (3) are symmetrically arranged at both ends of the crossbeams (2), and each crossbeam (2) is perpendicular to the two longitudinal beams (3) at the same time. The longitudinal beams (3) are connected to the crossbeams (2) above the crossbeams (2) to form a grid structure. S33: The grid structure is set at the determined arrangement position of the pipe pile cofferdam stabilization device, and the bottom of the crossbeam (2) is embedded into the mud surface (7) with the bottom facing downward. Then, multiple pipe piles (1) are arranged in parallel and spaced in two rows and vertically inserted into the arrangement position. The mud section (12) of each pipe pile (1) is inserted into the mud surface (7) of the arrangement position, and the overlapping fastener (11) is fastened to the top of the longitudinal beam (3). The single crossbeam (2) is located in the gap between adjacent pipe piles (1) in a single row of pipe piles (1).

7. The method for constructing a pipe pile cofferdam according to claim 6, characterized in that, In step S33, the arrangement position of the grid structure is first determined at the determined arrangement position of the pipe pile cofferdam stabilization device. Then, four positioning pipe piles (8) are diagonally inserted into the mud surface (7) for positioning. Then, the grid structure is set at the determined arrangement position of the grid structure using steel wire rope slings (6) and the bottom groove of the crossbeam (2) is embedded into the mud surface (7) with the bottom groove facing downward. Each of the extended crossbeams (5) is close to two positioning pipe piles (8). Then, other pipe piles (1) are driven onto the grid structure.

8. The method for constructing a pipe pile cofferdam according to claim 5, characterized in that, In step S4, after filling the interior of the cofferdam containment space (4) with soil, if the elevation of the cofferdam is lower than the design elevation, bagged soil is added to the top of the cofferdam until the elevation of the cofferdam reaches the design elevation.

9. The method for constructing a pipe pile cofferdam according to claim 7, characterized in that, In step S4, after the soil is filled into the cofferdam accommodating space (4), the wire rope sling (6) is tightened and fixed to the positioning pipe pile (8) and the waler.

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