Cofferdam structure

Abstract

The utility model discloses a cofferdam structure which comprises a cofferdam body and at least two truss supporting units. The cofferdam body is rectangular, the cofferdam body is provided with at least two rectangular closed cabins, and each rectangular closed cabin comprises a side wall. The truss supporting units correspond to the rectangular closed cabins one to one, the truss supporting units are arranged in the rectangular closed cabins, each truss supporting unit comprises at least one truss beam assembly, the truss beam assemblies are located on one sides of the inner surfaces of the side walls and abut against the side walls, and the length directions of the truss beam assemblies extend in the length direction of the side walls. The cross section of the truss girder assembly is gradually reduced in the direction from the middle of the length of the truss girder assembly to the edge of the length of the truss girder assembly, or the cross section of the truss girder assembly is gradually reduced in the direction from the center of the length direction of the truss girder assembly to the edge of the length of the truss girder assembly. In this way, the truss beam assembly is an equal-strength truss beam or, close to, approximately, an equal-strength truss beam. The material consumption is reduced; and excessive and too dense arrangement of the supporting beams is avoided, and foundation pit excavation is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge construction, in particular to a cofferdam structure. Background Art

[0002] In bridge engineering, for narrow or extra-large foundation pits, more supporting beams and purlins need to be installed during the construction process to balance the soil pressure of the maintenance structure.

[0003] After the foundation construction is completed, more supporting beams will affect the construction of the piers. At the same time, the excavation of the foundation pit follows the principle of excavation as soon as possible, rapid support, and early backfilling. However, more supports will affect the convenience of foundation pit excavation, resulting in a serious reduction in construction speed. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to propose a cofferdam structure that can ensure the stability of the cofferdam structure and avoid excessive and dense arrangement of supporting beams, which is conducive to the excavation of the foundation pit and thus improves the construction speed.

[0005] A cofferdam structure according to an embodiment of the utility model includes a cofferdam body and at least two truss support units.

[0006] The cofferdam body is formed by connecting a plurality of steel sheet piles so that the cofferdam body is rectangular, the cofferdam body has a rectangular closed space, the rectangular closed space is divided into at least two rectangular closed cabins, and the rectangular closed cabins include side walls;

[0007] The truss support unit corresponds to the rectangular closed cabin one by one, and is arranged in the rectangular closed cabin. The truss support unit includes at least one truss beam assembly, and the truss beam assembly is located on one side of the inner surface of the side wall, and the two are against each other, and the length direction of the truss beam assembly extends along the length direction of the side wall.

[0008] The cross-section of the truss girder assembly gradually decreases from the middle of the length of the truss girder assembly to the edge of its length, or,

[0009] The cross-section of the truss beam assembly gradually decreases from the center of the length direction of the truss beam assembly to the edge of the length thereof.

[0010] In this embodiment, the cross section of the truss beam assembly is gradually reduced from the middle of the length of the truss beam assembly to the edge of its length, or the cross section of the truss beam assembly is gradually reduced from the center of the length of the truss beam assembly to the edge of its length, so that the truss beam assembly is an equal-strength truss beam, or is close to or approximates an equal-strength truss beam. Such an arrangement can reduce the amount of material used; at the same time, the arrangement of the truss support unit and the cofferdam body can ensure the stability of the cofferdam structure and avoid the excessive and dense arrangement of support beams, which is beneficial to the excavation of the foundation pit and thus improves the construction speed. In addition, the piers located at the corners of the truss support unit are not easily interfered by the truss beam assembly.

[0011] According to some embodiments of the present invention, the truss beam assembly is an equal-strength truss beam.

[0012] According to some embodiments of the present invention, a cross section of the truss beam assembly includes a frame-shaped structure.

[0013] According to some embodiments of the present invention, the truss beam assembly includes at least two support assemblies, a plurality of first vertical beams and a plurality of second vertical beams.

[0014] The support assemblies are arranged at intervals in the vertical direction, and the first vertical beam and the second vertical beam are arranged between two adjacent support assemblies. The first vertical beam is in contact with the side wall, and the second vertical beam is arranged away from the side wall.

[0015] A plurality of the first vertical beams and a plurality of the second vertical beams are arranged along the length direction of the support assembly, and the first vertical beams, the support assembly of the upper layer, the second vertical beams and the support assembly of the lower layer constitute the frame structure.

[0016] According to some embodiments of the present invention, the support assembly includes a plurality of first support beams and a plurality of reinforcement beams, the first support beams are arranged perpendicular to the side walls, and the plurality of first support beams are arranged along the length direction of the truss beam assembly.

[0017] The length of each of the first support beams gradually decreases from the middle of the length of the truss beam assembly to the edge of its length, or the length of each of the first support beams gradually decreases from the center of the length direction of the truss beam assembly to the edge of its length,

[0018] The reinforcing beams are alternately arranged with the first supporting beams, one end of the reinforcing beam is connected to an end of one of two adjacent first supporting beams facing the side wall, and the other end of the reinforcing beam is connected to an end of the other of two adjacent first supporting beams facing away from the side wall.

[0019] According to some embodiments of the utility model, the first bracket and the first flexible traction member are also included, the first bracket, the first flexible traction member, and the first support beam correspond to each other, the first bracket is connected to the cofferdam body, the first bracket is located below the truss beam assembly, and the first bracket supports the truss beam assembly.

[0020] The first flexible traction member is located above the truss beam assembly, one end of the first flexible traction member is connected to the cofferdam body, and the other end of the first flexible traction member is connected to the truss beam assembly.

[0021] According to some embodiments of the present invention, a middle beam assembly is further included, wherein the middle beam assembly is perpendicular to the side wall of the cofferdam body to divide the rectangular closed space into at least two rectangular closed compartments.

[0022] According to some embodiments of the utility model, a second corbel and a second flexible traction member are further included, wherein the second corbel is connected to the cofferdam body, the second corbel is located below the middle beam assembly, and the second corbel supports the middle beam assembly.

[0023] The second flexible traction member is located above the middle beam assembly, one end of the second flexible traction member is connected to the cofferdam body, and the other end is connected to the middle beam assembly.

[0024] According to some embodiments of the present utility model, the truss beam assembly is arranged away from the bottom of the foundation pit, and the intermediate beam assembly is arranged away from the bottom of the foundation pit.

[0025] According to some embodiments of the present invention, the intermediate beam assembly and the truss beam assembly are connected into a whole.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1 is a schematic diagram of a cofferdam structure according to an embodiment of the utility model;

[0029] Figure 2 It is a schematic diagram of a connection structure between a truss support unit and a rectangular closed cabin according to an embodiment of the utility model;

[0030] Figure 3 yes Figure 2 AA direction cross-sectional view;

[0031] Figure 4 yes Figure 2 BB direction cross-sectional view;

[0032] Figure 5 is a schematic diagram of a cross section D of a first truss beam assembly according to an embodiment of the utility model;

[0033] Figure 6 is a schematic diagram of a cross section G of a first truss beam assembly according to an embodiment of the utility model;

[0034] Figure 7 is a schematic diagram of a cross section H of a first truss beam assembly according to an embodiment of the utility model;

[0035] Figure 8 is a schematic cross-sectional view I of a first truss beam assembly according to an embodiment of the present utility model;

[0036] Fig. 9 It is a schematic diagram of another structure of connection between a truss support unit and a rectangular closed cabin according to an embodiment of the utility model;

[0037] Reference numerals:

[0038] Steel sheet piles 10, rectangular closed cabin 101;

[0039] Truss support unit 20, truss beam assembly 201, first truss beam assembly 201a, second truss beam assembly 201b, support assembly 2011;

[0040] A first support beam 21, a second support beam 22, a third support beam 23, a reinforcement beam 24, a first vertical beam 25, and a second vertical beam 26;

[0041] A first flexible traction member 271, a second flexible traction member 272, a first corbel 281, and a second corbel 282;

[0042] Pier 40. DETAILED DESCRIPTION

[0043] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0044] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the applicability of other processes and / or the use of other materials.

[0045] like Figure 1-Figure 9 As shown, the cofferdam structure provided according to the utility model includes a cofferdam body and at least two truss support units 20.

[0046] The cofferdam body is formed by connecting a plurality of steel sheet piles 10 so that the cofferdam body is rectangular. The cofferdam body has a rectangular closed space, which is divided into at least two rectangular closed cabins 101, and the rectangular closed cabins 101 include side walls.

[0047] The truss support unit 20 corresponds one-to-one to the rectangular closed cabin 101. The truss support unit 20 is arranged in the rectangular closed cabin 101. The truss support unit 20 includes at least one truss beam assembly 201. The truss beam assembly 201 is located on one side of the inner surface of the side wall, and the two are abutted against each other. The length direction of the truss beam assembly 201 extends along the length direction of the side wall.

[0048] The cross-section of the truss beam assembly 201 gradually decreases from the middle of the length of the truss beam assembly 201 to the edge of its length, or,

[0049] The cross-section of the truss beam assembly 201 gradually decreases from the center of the length direction of the truss beam assembly 201 to the edge of the length direction thereof.

[0050] It should be noted that the cofferdam structure is a temporary enclosure form widely used in the construction of deep-water bridge foundations. During the enclosure process, the inner wall of the steel sheet pile enclosure is often reinforced with a steel frame to enable the enclosure to maintain a stable enclosure effect.

[0051] In bridge engineering, for narrow or extra-large foundation pits, more support beams and purlins need to be set up during the construction process to balance the soil pressure of the maintenance structure. After the foundation is constructed, more support beams will affect the construction of the piers. At the same time, the excavation of the foundation pit follows the principle of excavation as soon as possible, rapid support, and early backfilling. However, more supports will affect the convenience of foundation pit excavation, resulting in a serious reduction in construction speed.

[0052] Based on this, the two ends of the truss beam assembly 201 of this embodiment are fixed, the truss beam assembly 201 is subjected to a uniformly distributed load q, the length of the truss beam assembly 201 is l, and the bending moment M of the truss beam assembly 201 is max =ql 2 / 8.

[0053] In order to make the truss beam assembly 201 an equal strength truss beam, the bending stress of each cross section of the truss beam assembly 201 should be the same; or, the truss beam assembly 201 is close to or approximately an equal strength truss beam, and the bending stress of each cross section of the truss beam assembly 201 is close to or approximately the same, so the size of each cross section of the truss beam assembly 201 is changed accordingly according to the magnitude of the bending moment, and the cross section of the truss beam assembly 201 gradually decreases from the middle of the length of the truss beam assembly 201 to the edge of its length, or,

[0054] The cross-section of the truss beam assembly 201 gradually decreases from the center of the length direction of the truss beam assembly 201 to the edge of the length direction thereof.

[0055] Specifically, if Fig. 9 As shown, in one embodiment, the rectangular closed cabin 101 includes two long side walls and one short side wall arranged opposite to each other, and the truss support unit 20 includes three truss beam assemblies 201: two first truss beam assemblies 201a and one second truss beam assembly 201b. The two first truss beam assemblies 201a and one second truss beam assembly 201b are connected to form the above-mentioned truss support unit 20.

[0056] A first truss beam assembly 201a is provided on each of the two long side walls, and the first truss beam assembly 201a is located on one side of the inner surface of the long side wall, and the two are butted against each other. A second truss beam assembly 201b is provided on the short side wall, and the second truss beam assembly 201b is located on one side of the inner surface of the short side wall, and the two are butted against each other.

[0057] Take the long side wall as an example:

[0058] The length direction of the first truss beam assembly 201a extends along the length direction of the side wall, and both ends of the first truss beam assembly 201a are fixed. The first truss beam assembly 201a includes cross sections D, E, F, G, and H, which are arranged at equal intervals along the length direction of the first truss beam assembly 201a.

[0059] In order to make the first truss beam assembly 201a a truss beam of equal strength, that is, the bending stress of the cross section D corresponding to the first truss beam assembly 201a, the bending stress of the cross section E corresponding to the first truss beam assembly 201a, the bending stress of the cross section F corresponding to the first truss beam assembly 201a, the bending stress of the cross section G corresponding to the first truss beam assembly 201a, and the bending stress of the cross section H corresponding to the first truss beam assembly 201a are all the same. Therefore, along the direction from the center of the length of the first truss beam assembly 201a to the edge of its length, that is, the C1 direction, the cross sections D, E, F, G, and H corresponding to the first truss beam assembly 201a gradually decrease.

[0060] With such arrangement, after static load analysis, the first truss beam assembly 201a has a reasonable structural design, which can reduce the amount of material used. At the same time, the arrangement of the first truss beam assembly 201a and the cofferdam body can ensure the stability of the cofferdam structure and avoid excessive and dense arrangement of support beams, which is beneficial to the excavation of the foundation pit and thus increases the construction speed.

[0061] In another embodiment, if Figure 2 As shown, the rectangular closed cabin 101 includes long side walls and short side walls arranged opposite to each other, and the truss support unit 20 includes three truss beam assemblies 201: two first truss beam assemblies 201a and one second truss beam assembly 201b. The two first truss beam assemblies 201a and one second truss beam assembly 201b are connected to form the above-mentioned truss support unit 20.

[0062] A first truss beam assembly 201a is provided on each of the two long side walls, and the first truss beam assembly 201a is located on one side of the inner surface of the long side wall, and the two are butted against each other. A second truss beam assembly 201b is provided on the short side wall, and the second truss beam assembly 201b is located on one side of the inner surface of the short side wall, and the two are butted against each other.

[0063] Taking the long side wall as an example: the length direction of the first truss beam assembly 201a extends along the length direction of the side wall, and both ends of the first truss beam assembly 201a are fixed. The first truss beam assembly 201a includes cross sections D, E, F, G, H, and I, and the cross sections D, E, F, G, H, and I are arranged at equal intervals along the length direction of the first truss beam assembly 201a.

[0064] like Figure 5-Figure 8As shown, in order to make the first truss beam assembly 201a an equal-strength truss beam, that is, the bending stress of the cross-section D corresponding to the first truss beam assembly 201a, the bending stress of the cross-section E corresponding to the first truss beam assembly 201a, the bending stress of the cross-section F corresponding to the first truss beam assembly 201a, the bending stress of the cross-section G corresponding to the first truss beam assembly 201a, the bending stress of the cross-section H corresponding to the first truss beam assembly 201a, and the bending stress of the cross-section I corresponding to the first truss beam assembly 201a are all the same, so along the direction from the middle of the length of the first truss beam assembly 201a to the edge of its length, that is, the C2 direction, the cross-sections D (E, F), G, H, and I corresponding to the first truss beam assembly 201a gradually decrease.

[0065] Among them, the cross-section D, cross-section E, and cross-section F of the first truss beam component 201a are exactly the same, and the area between the cross-section D and the cross-section F is defined as the middle part of the first truss beam component 201a. Of course, it can be understood that the middle part of the first truss beam component 201a can be the area between the cross-section D and the cross-section E, and the middle part of the first truss beam component 201a can be half of the area between the cross-section D and the cross-section E, ..., which are not listed one by one in this embodiment.

[0066] With such arrangement, after static load analysis, the first truss beam assembly 201a has a reasonable structural design, which can reduce the amount of material used. At the same time, the arrangement of the first truss beam assembly 201a and the cofferdam body can ensure the stability of the cofferdam structure and avoid excessive and dense arrangement of support beams, which is beneficial to the excavation of the foundation pit and thus increases the construction speed.

[0067] In summary, in this embodiment, the cross section of the truss beam assembly 201 is gradually reduced from the middle of the length of the truss beam assembly 201 to the edge of its length, or the cross section of the truss beam assembly 201 is gradually reduced from the center of the length direction of the truss beam assembly 201 to the edge of its length, so that the truss beam assembly 201 is an equal strength truss beam, or is close to or approximates an equal strength truss beam. Such an arrangement can reduce the amount of material used; at the same time, the arrangement of the truss support unit 20 and the cofferdam body can ensure the stability of the cofferdam structure, and avoid the excessive and dense arrangement of support beams, which is beneficial to the excavation of the foundation pit, thereby increasing the construction speed. In addition, the pier 40 located at the corner of the truss support unit 20 is not easily interfered by the truss beam assembly 201.

[0068] The following embodiment is described by taking the first truss beam assembly 201a corresponding to the long side wall as an example:

[0069] According to some embodiments of the present invention, the cross section of the first truss beam assembly 201a includes a frame-shaped structure. This arrangement can improve the stability of the first truss beam assembly 201a.

[0070] In detail: the first truss beam assembly 201a includes at least two support assemblies 2011, a plurality of first vertical beams 25 and a plurality of second vertical beams 26. The support assemblies 2011 are arranged at intervals in the vertical direction, and a first vertical beam 25 and a second vertical beam 26 are arranged between two adjacent support assemblies 2011. The first vertical beam 25 is in contact with the side wall, and the second vertical beam 26 is arranged away from the side wall.

[0071] A plurality of first vertical beams 25 and a plurality of second vertical beams 26 are arranged along the length direction of the support assembly 2011 , and the first vertical beams 25 , the upper support assembly 2011 , the second vertical beams 26 and the lower support assembly 2011 form a frame structure.

[0072] In a specific embodiment, Figure 2 and Figure 3 As shown, the first truss beam assembly 201 a includes two support assemblies 2011 , a first vertical beam 25 and a second vertical beam 26 .

[0073] The support assembly 2011 includes a plurality of first support beams 21, a plurality of second support beams 22, a plurality of third support beams 23 and a plurality of reinforcing beams 24. The second support beams 22 are parallel to the long side walls, and the second support beams 22 and the third support beams 23 extend along the length direction of the long side walls, the second support beams 22 are in contact with the long side walls, and the third support beams 23 are arranged away from the long side walls.

[0074] The first support beam 21 is arranged perpendicular to the side wall, and a plurality of first support beams 21 are arranged along the length direction of the truss beam assembly 201. The length of each first support beam 21 gradually decreases from the middle of the length of the truss beam assembly 201 to the edge of the length thereof. Figure 2 As shown, the lengths of the first support beam 21a, the first support beam 21b, the first support beam 21c, and the first support beam 21d gradually decrease along the direction C2, so that the cross-sections D (E, F), G, H, and I corresponding to the first truss beam assembly 201a gradually decrease.

[0075] The two ends of the first support beam 21 are connected to the second support beam 22 and the third support beam 23 respectively, and the ends of two adjacent first support beams 21 facing away from the long side wall are connected by a third support beam 23 .

[0076] The reinforcing beams 24 and the first support beams 21 are arranged alternately, one end of the reinforcing beam 24 is connected to one end of one of the two adjacent first support beams 21 facing the long side wall, and the other end of the reinforcing beam 24 is connected to one end of the other of the two adjacent first support beams 21 facing away from the long side wall. The two adjacent first support beams 21, the second support beam 22, and the third support beam 23 form a quadrilateral, and the reinforcing beam 24 divides the quadrilateral into two triangles. The triangular structure has good stability, which helps to improve the stability of the first truss beam assembly 201a.

[0077] In addition, if Figure 3 As shown, the first vertical beam 25 and the second vertical beam 26 are located between two adjacent support assemblies 2011, the first vertical beam 25 is in contact with the long side wall, and the second vertical beam 26 is arranged away from the long side wall. A plurality of first vertical beams 25 and a plurality of second vertical beams 26 are arranged along the length direction of the support assembly 2011.

[0078] like Figure 5-Figure 8 As shown, the first vertical beam 25, the first support beam 21 of the upper support assembly 2011, the second vertical beam 26 and the first support beam 21 of the lower support assembly 2011 form a frame structure. That is, a plurality of frame structures are arranged along the length direction of the first truss beam assembly 201a, and the frame structure has good stability, which helps to improve the stability of the first truss beam assembly 201a.

[0079] According to some embodiments of the present invention, Figure 3 As shown, the cofferdam structure further includes a first corbel 281 and a first flexible traction member 271 , and the first corbel 281 , the first flexible traction member 271 , and the first support beam 21 correspond to each other one by one.

[0080] The first corbel 281 is connected to the cofferdam body, and is located below the first truss beam assembly 201a. The first corbel 281 supports the first truss beam assembly 201a. The first flexible traction member 271 is located above the first truss beam assembly 201a, and one end of the first flexible traction member 271 is connected to the cofferdam body, and the other end is connected to the first truss beam assembly 201a.

[0081] With such arrangement, the first truss beam assembly 201a is supported from below by the first corbel 281 to suppress the deflection of the first truss beam assembly 201a; the first truss beam assembly 201a is pulled from above by the first flexible pulling member 271 to suppress the deflection of the first truss beam assembly 201a.

[0082] According to some embodiments of the present invention, the cofferdam structure further includes a middle beam assembly, which is perpendicular to the side wall of the cofferdam body to divide the rectangular closed space into at least two rectangular closed cabins 101 .

[0083] In one embodiment, if Figure 2 and Figure 4 As shown, the cofferdam body has a rectangular closed space, in which a middle beam assembly is arranged. The middle beam assembly extends along the width direction of the rectangular closed space, and the middle beam assembly is perpendicular to the long side wall of the cofferdam body to divide the rectangular closed space into two rectangular closed cabins 101.

[0084] The middle beam assembly is connected to the first truss beam assembly 201a in one rectangular closed cabin 101 and the first truss beam assembly 201a in another rectangular closed cabin 101 to form a whole. The middle beam assembly is substantially the same as the first truss beam assembly 201a, so it will not be described in detail.

[0085] It should be noted that, for a narrow and long rectangular foundation pit, technical personnel in this field can adjust the number of intermediate beam assemblies according to actual conditions. Each intermediate beam assembly extends along the width direction of the rectangular closed space, and several intermediate beam assemblies are arranged at equal intervals along the length direction of the rectangular closed space.

[0086] Such a setting can, on the one hand, ensure the stability of the cofferdam structure, and on the other hand, effectively save materials and free up space for excavation of the foundation pit.

[0087] Furthermore, if Figure 4 As shown, the cofferdam structure also includes a second corbel 282 and a second flexible traction member 272. The second corbel 282 is connected to the cofferdam body. The second corbel 282 is located below the middle beam assembly. The second corbel 282 supports the middle beam assembly. The second flexible traction member 272 is located above the middle beam assembly. One end of the second flexible traction member 272 is connected to the cofferdam body, and the other end is connected to the middle beam assembly.

[0088] Both ends of the middle beam assembly correspond to the second bracket 282 and the second flexible traction member 272. This arrangement can ensure the stability of the middle beam assembly.

[0089] It should be noted that the first truss beam assembly 201a is arranged far away from the bottom of the foundation pit, and the middle beam assembly is arranged far away from the bottom of the foundation pit to avoid collapse at the opening of the foundation pit.

[0090] According to some embodiments of the present invention, the truss beam assembly 201 and the middle beam assembly are both formed by welding various beams, and the beams can be angle steels, H-shaped steels, square steels, etc., which are not limited in this embodiment.

[0091] Wherein, the first and second flexible traction members can be steel wire ropes.

[0092] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0093] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0094] In the description of the present invention, "plurality" means two or more.

[0095] In the description of the present invention, a first feature being “above” or “below” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact but are in contact with each other via another feature therebetween.

[0096] In the description of the present invention, a first feature “above”, “over” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0097] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0098] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A cofferdam structure, characterized in that: include: A cofferdam body, the cofferdam body being formed by connecting a plurality of steel sheet piles (10) so that the cofferdam body is rectangular, the cofferdam body having a rectangular closed space, the rectangular closed space being divided into at least two rectangular closed cabins (101), the rectangular closed cabins (101) comprising side walls; At least two truss support units (20); the truss support units (20) correspond to the rectangular closed cabins (101) one by one, the truss support units (20) are arranged in the rectangular closed cabin (101), the truss support units (20) include at least one truss beam assembly (201), the truss beam assembly (201) is located on one side of the inner surface of the side wall, and the two are in contact with each other, and the length direction of the truss beam assembly (201) extends along the length direction of the side wall. The cross-section of the truss beam assembly (201) gradually decreases from the middle of the length of the truss beam assembly (201) to the edge of the length thereof, or, The cross section of the truss beam assembly (201) gradually decreases in a direction from the center of the length direction of the truss beam assembly (201) to the edge of the length thereof.

2. The cofferdam structure according to claim 1, characterized in that: The truss beam assembly (201) is a truss beam of equal strength.

3. The cofferdam structure according to claim 1, characterized in that: The cross section of the truss beam assembly (201) comprises a frame-shaped structure.

4. The cofferdam structure according to claim 3, characterized in that: The truss beam assembly (201) comprises at least two support assemblies (2011), a plurality of first vertical beams (25) and a plurality of second vertical beams (26). The supporting assemblies (211) are arranged at intervals in the vertical direction, and the first vertical beam (25) and the second vertical beam (26) are arranged between two adjacent supporting assemblies (2011); the first vertical beam (25) is in contact with the side wall, and the second vertical beam (26) is arranged away from the side wall. A plurality of the first vertical beams (25) and a plurality of the second vertical beams (26) are arranged along the length direction of the support assembly (2011); the first vertical beams (25), the support assembly (2011) of the upper layer, the second vertical beams (26) and the support assembly (2011) of the lower layer form the frame structure.

5. The cofferdam structure according to claim 4, characterized in that: The support assembly (2011) comprises a plurality of first support beams (21) and a plurality of reinforcement beams (24), wherein the first support beams (21) are arranged perpendicular to the side walls, and the plurality of first support beams (21) are arranged along the length direction of the truss beam assembly (201). The length of each of the first support beams (21) gradually decreases from the middle of the length of the truss beam assembly (201) to the edge of its length, or the length of each of the first support beams (21) gradually decreases from the center of the length direction of the truss beam assembly (201) to the edge of its length, The reinforcing beams (24) and the first supporting beams (21) are arranged alternately, one end of the reinforcing beam (24) is connected to an end of one of two adjacent first supporting beams (21) facing the side wall, and the other end of the reinforcing beam (24) is connected to an end of the other of the two adjacent first supporting beams (21) facing away from the side wall.

6. The cofferdam structure according to claim 5, characterized in that: The truss beam assembly (201) further comprises a first bracket (281) and a first flexible traction member (271), wherein the first bracket (281), the first flexible traction member (271), and the first support beam (21) correspond to each other one by one. The first corbel (281) is connected to the cofferdam body, the first corbel (281) is located below the truss beam assembly (201), and the first corbel (281) supports the truss beam assembly (201). The first flexible traction member (271) is located above the truss beam assembly (201); one end of the first flexible traction member (271) is connected to the cofferdam body, and the other end is connected to the truss beam assembly (201).

7. The cofferdam structure according to claim 1, characterized in that: It also comprises an intermediate beam assembly (30), wherein the intermediate beam assembly (30) is perpendicular to the side wall of the cofferdam body so as to divide the rectangular closed space into at least two rectangular closed compartments (101).

8. The cofferdam structure according to claim 7, characterized in that: It also includes a second corbel (282) and a second flexible traction member (272), wherein the second corbel (282) is connected to the cofferdam body, the second corbel (282) is located below the middle beam assembly (30), and the second corbel (282) supports the middle beam assembly (30). The second flexible traction member (272) is located above the middle beam assembly (30); one end of the second flexible traction member (272) is connected to the cofferdam body, and the other end is connected to the middle beam assembly (30).

9. The cofferdam structure according to claim 7, characterized in that: The truss beam assembly (201) is arranged far away from the bottom of the foundation pit, and the intermediate beam assembly (30) is arranged far away from the bottom of the foundation pit.

10. The cofferdam structure according to claim 9, characterized in that: The intermediate beam assembly (30) and the truss beam assembly (201) are connected into a whole.

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