Steel sheet pile cofferdam suitable for construction of large-size bearing platform

Abstract

The utility model provides a steel sheet pile cofferdam suitable for construction of a large-size bearing platform, which comprises a steel sheet pile, a plurality of layers of enclosing purlins are arranged on the inner side of the steel sheet pile from top to bottom, a supporting assembly is arranged in each enclosing purlin, each supporting assembly comprises an inner supporting structure and a diagonal bracing structure, and the diagonal bracing structures are arranged on two opposite edges of the enclosing purlins and located in the middles of the enclosing purlins; the number of the inner supporting structures is four, and the four inner supporting structures are distributed at the four corners of the enclosing purlin correspondingly. The inner supporting structure and the opposite supporting structure are both connected with latticed column structures used for supporting in the vertical direction, and stand column foundations are fixed to the bottoms of the latticed column structures. The device is stable in structure, low in manufacturing cost and high in operability. By means of the foundation pit cofferdam, large-size bearing platform deep foundation pit construction can be safely and stably completed, cost is controllable, installation is convenient, construction risks are effectively reduced, and the safety requirement and construction efficiency of a deep foundation pit cofferdam are guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge cap foundation construction, and in particular relates to a steel sheet pile cofferdam suitable for large-volume cap construction. Background Art

[0002] A cofferdam is a temporary retaining structure built for the construction of permanent water conservancy facilities in water conservancy project construction. Its function is to prevent water and soil from entering the construction site of the building so that drainage can be done in the cofferdam, foundation pits can be excavated, and buildings can be built. It is generally used in hydraulic structures. Except as part of a formal building, the cofferdam is generally dismantled after use. The height of the cofferdam is higher than the highest water level that may occur during the construction period. In the construction of bridge foundations, when the bridge piers and platform foundations are located below the surface water level, various forms of earth weirs are built according to local materials; in rivers with deeper water and faster flow rates, wooden piles or steel sheet piles (single or double layers) cofferdams, as well as double-layer thin-walled steel cofferdams can be used. The function of the cofferdam is to prevent water, enclose water, and support the pit wall of the foundation pit.

[0003] Steel sheet pile cofferdam is the most commonly used sheet pile cofferdam. Steel sheet pile is a kind of steel with a lock. Its cross section has straight plate, groove and Z shape, etc., and has various sizes and interlocking forms. Common ones are Larson type and Lackawanna type. Its advantages are: high strength, easy to drive into hard soil layer; can be constructed in deep water, good waterproof performance; can form cofferdams of various shapes as needed, and can be reused many times, so it has a wide range of uses. In bridge construction, it is often used for cofferdams on the top of caissons, pipe column foundations, pile foundations and open excavation foundations. These cofferdams mostly use single-wall closed cofferdams with longitudinal and transverse supports, and add inclined supports to form a cage when necessary. The cofferdam is composed of many interconnected monomers, and each monomer is composed of many steel sheet piles. The range of the cofferdam is very large, and the weir wall cannot be supported by supports, so each monomer can resist overturning, sliding and prevent cracking at the interlocking part. Commonly used forms include circular and bulkhead shapes.

[0004] Judging from the current domestic situation, for large-scale bridge projects, in order to increase the aesthetics of the bridge, it has become a norm to design the main tower and main beam with novel and unique structures. However, due to the excessive weight of the main bridge as a whole, the required foundation bearing capacity is too high, which leads to the construction problem that the main tower and main beam foundation is too large, which poses a safety hazard to the steel sheet pile cofferdam structure.

[0005] In the past, the construction of pedestal foundations mainly adopted slope excavation or ordinary steel sheet pile cofferdam. When this method is used to construct large-volume pedestal foundations, multiple supports need to be added. Too many supports lead to too small construction space, making it difficult to operate machinery. There are certain safety risks and it cannot meet the requirements of large-volume pedestal construction. Utility Model Content

[0006] In view of the problems existing in the prior art, the utility model aims to provide a steel sheet pile cofferdam suitable for large-volume foundation construction.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A steel sheet pile cofferdam suitable for large-volume cap construction comprises rectangular steel sheet piles, wherein the inner side of the steel sheet piles is provided with multiple layers of purlins arranged closely to the surface of the steel sheet piles from top to bottom, wherein a support assembly is arranged inside the purlin, wherein the support assembly comprises an inner support structure and a counter-support structure, wherein the counter-support structure is arranged on two opposite sides of the purlin and is located in the middle of the purlin; wherein four inner support structures are symmetrically arranged about the center of the counter-support structure, and the four inner support structures are respectively distributed at four corners of the purlin;

[0009] The inner supporting structure and the counter-supporting structure are both connected to a lattice column structure for vertical support, and a column foundation is fixed at the bottom of the lattice column structure.

[0010] As a further optimization of the present invention, the internal support structure includes a first internal support, a second internal support and a third internal support which are arranged in parallel and at intervals from the corner edge of the purlin inward, and the two ends of the first internal support, the second internal support and the third internal support are respectively installed on two adjacent edges of the purlin.

[0011] As a further optimization of the present invention, the bracing structure includes a pair of parallel and spaced-apart braces, the two braces are symmetrical about the central axis of the purlin, and the two ends of each brace are respectively installed on two opposite sides of the purlin.

[0012] As a further optimization of the utility model, a plurality of transverse braces are arranged between the two pairs of braces, and the plurality of transverse braces are arranged in parallel and at intervals.

[0013] As a further optimization of the utility model, a plurality of lattice column structures arranged at intervals are respectively arranged below the counter support and the third inner support, and the lattice column structure includes a column, the top of the column is fixed to the counter support or the third inner support through a frame, and the bottom of the column is fixed to the column foundation, and the column foundation is a reinforced concrete structure.

[0014] Preferably, a sash corbel is connected to the connection between the column and the counter support or the third inner support.

[0015] Preferably, corner supports are connected at the connection points between the perimeter purlins and the steel sheet piles on each layer.

[0016] As a further optimization of the present invention, first stiffening plates are respectively provided at the connection points between the surrounding purlin and the corner support, the first inner support, the second inner support, the third inner support and the opposite support.

[0017] Optionally, the purlin is provided with three layers, namely the first purlin, the second purlin and the third purlin, and the first purlin, the second purlin and the third purlin are installed on the inner side of the steel sheet pile from top to bottom in sequence as the excavation depth increases, and are fixed by welding corbels.

[0018] Optionally, the first inner support, the second inner support and the third inner support have the same structure, including steel pipe piles, double-piece steel and connecting steel plates, the two ends of the steel pipe piles are respectively connected to connecting steel plates, the outer side of each connecting steel plate is connected to a double-piece steel, and the double-piece steel is fixedly connected to the purlin.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] 1. The utility model arranges a surrounding purlin along the circumference of the inner side of the steel sheet pile, arranges a bracing structure in the middle of the surrounding purlin, arranges an inner supporting structure at the four corners of the surrounding purlin, and arranges a lattice column structure below the inner supporting structure, thereby realizing vertical support and lateral limitation of the steel sheet pile, so that the steel sheet pile cofferdam suitable for large-volume pedestal construction described in the utility model is not only stable in structure, low in manufacturing cost, but also easy to install.

[0021] 2. The utility model arranges a bracing structure on two opposite sides of the purlin and arranges an inner supporting structure symmetrically distributed about the center of the bracing structure at the four corners of the purlin, which not only strengthens the support of the purlin, but also disperses the force of the purlin to ensure the stability of the structure.

[0022] 3. The inner support structure of the utility model is composed of the first inner support, the second inner support and the third inner support, which are arranged in parallel and spaced from the corner edge of the purlin to the inside, and the two ends of the first inner support, the second inner support and the third inner support are respectively installed on the two adjacent sides of the purlin. The utility model forms a stable force-bearing structure inside the cofferdam by arranging the inner support structure at the four corners of the purlin, which can evenly disperse the force, ensure the stability of the internal structure, and enhance the overall structural strength.

[0023] 4. The utility model forms internal support by arranging support components in the purlin; and forms external support by arranging lattice column structures below the internal support structure and the supporting structure, so that the purlin has good support and fixation inside and outside, the force is evenly distributed, the structure is firm and not easy to collapse, can adapt to the pressure of large-volume pedestals, is not easy to deform, and has a high safety factor.

[0024] 5. The use of the steel sheet pile cofferdam suitable for large-volume foundation construction described in the utility model can safely and stably complete the construction of large-volume foundation steel sheet pile cofferdam, achieve cost control and convenient installation, effectively reduce construction risks, and ensure the safety requirements and construction efficiency of deep foundation pit cofferdams.

[0025] 6. The steel sheet pile cofferdam described in the utility model has low processing difficulty, reasonable and clear force, and is suitable for large-volume foundation construction.

[0026] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other design solutions and drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is the overall layout diagram of the utility model.

[0029] Figure 2 It is a vertical layout diagram of the utility model.

[0030] Figure 3 It is a schematic diagram of the lattice column structure.

[0031] Figure 4 This is a large-scale drawing of the purlin and internal supporting structure.

[0032] Figure 5 This is the general drawing of the connection between the first internal support and the surrounding purlin.

[0033] Description of reference numerals:

[0034] 1. Steel sheet piles;

[0035] 2. Enclosure purlin;

[0036] 3. Corner support;

[0037] 4. The first inner support;

[0038] 5. Second inner support;

[0039] 6. The third inner support;

[0040] 7. Column;

[0041] 8. Frame;

[0042] 9. Support each other;

[0043] 10. Horizontal brace;

[0044] 11. The first purlin;

[0045] 12. Second purlin;

[0046] 13. The third purlin;

[0047] 14. Column foundation;

[0048] 15. Ox leg;

[0049] 16. Steel pipe piles;

[0050] 17. Frame corbel;

[0051] 18. The first stiffening plate;

[0052] 19. Double steel;

[0053] 20. Connect steel plates.

[0054] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. DETAILED DESCRIPTION

[0055] The content of the present invention can be further understood in conjunction with the following detailed description of the preferred implementation method of the present invention and the included embodiments. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as those generally understood by ordinary technicians in the field to which the present invention belongs. If the definition of a specific term disclosed in the prior art is inconsistent with any definition provided in the present invention, the definition of the term provided in the present invention shall prevail.

[0056] In the description of the present invention, it should be understood that the terms "center", "vertical", "lateral", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are 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 device or element referred to 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.

[0057] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" and "several" is two or more, unless otherwise clearly and specifically defined.

[0058] In a typical implementation of this application, please refer to Figure 1A steel sheet pile cofferdam suitable for large-volume foundation construction includes a rectangular steel sheet pile 1, and the inner side of the steel sheet pile is provided with multiple layers of purlins 2 arranged close to the surface of the steel sheet pile 1 from top to bottom. The purlin 2 is provided with a support assembly, and the support assembly includes an inner support structure and a bracing structure. The bracing structure is arranged on two opposite long sides of the purlin 2 and is located in the middle of the purlin 2; four inner support structures are symmetrically arranged about the center of the bracing structure, and the four inner support structures are respectively distributed at the four corners of the purlin 2; the inner support structure and the bracing structure are connected to a lattice column structure for vertical support, and a column foundation 14 is fixed at the bottom of the lattice column structure. After the steel sheet pile cofferdam structure is installed, the overall stability of the structure is reduced due to the large overall volume of the foundation and the long support span. Lattice columns are installed at the concentrated force point to improve its stability and ensure construction safety. In addition, it needs to be further explained that the utility model forms internal support by arranging a support component inside the purlin 2; and arranging a lattice column structure below the internal support structure and the supporting structure to form an external support, so that the inside and outside of the purlin are well supported and fixed, the force is evenly distributed, the structure is firm and not easy to collapse, it can adapt to the pressure of large-volume pedestals, is not easy to deform, and has a high safety factor.

[0059] In a preferred embodiment, if Figure 1 As shown, the bracing structure includes a pair of parallel and spaced braces 9, the two braces 9 are symmetrical about the central axis of the purlin 2, and the two ends of each brace 9 are respectively installed on two opposite sides of the purlin 2. The inner support structure includes a first inner support 4, a second inner support 5 and a third inner support 6, which are arranged in parallel and spaced from the corner edge of the purlin 2 inward in sequence, and the two ends of the first inner support 4, the second inner support 5 and the third inner support 6 are respectively installed on two adjacent sides of the purlin 2. The utility model forms a stable force-bearing structure inside the cofferdam by respectively arranging inner support structures at the four corners of the purlin, and then connecting each inner support member to the purlin. The stress on the purlin can be evenly dispersed, ensuring the stability of the internal structure, enhancing the overall structural strength, and improving the service life.

[0060] In order to further optimize the above technical solution, the solution of the utility model is improved as follows: a plurality of parallel and spaced cross braces 10 are arranged between the two pairs of braces 9, which greatly improves the stability and safety of the surrounding purlin.

[0061] On the basis of the above embodiments, the present invention also preferably provides the following improvements:

[0062] like Figure 1 As shown, each layer of the perimeter purlin 2 and the steel sheet pile 1 is connected with an angle support 3, which can further improve stability. It is worth mentioning that the number of installation layers of the angle support, the inner support structure and the bracing structure is the same as that of the perimeter purlin, and they are installed and fixed from the outside to the inside in a fixed order.

[0063] like Figure 4 As shown, first stiffening plates 18 are respectively provided at the connection points between the purlin 2 and the corner support 3, the first inner support 4, the second inner support 5, the third inner support 6 and the opposite support 9, which can further improve the stability and increase the connection strength.

[0064] like Figure 5 As shown, the first inner support 4, the second inner support 5, and the third inner support 6 have the same structure, including steel pipe piles 16, double-jointed steel sections 19, and connecting steel plates 20. The two ends of the steel pipe piles 16 are respectively connected to connecting steel plates 20, and the outer side of each connecting steel plate 20 is connected to a double-jointed steel section 19, and the double-jointed steel section 19 is fixedly connected to the surrounding purlin 2. Specifically, one of the double-jointed steel sections 19 is fixed to one side of the surrounding purlin 2, and the other double-jointed steel section 19 is fixed to the other side adjacent to the side.

[0065] In actual use, steel sections and stiffening plates are used to form a structural whole with steel pipe piles to jointly ensure the force-bearing structural system of the steel sheet pile cofferdam.

[0066] The above technical solution not only avoids the cost waste caused by excessive material selection, but also ensures the safety of the force concentration points at both ends of the inner support, on the basis of ensuring the safe realization of its functions.

[0067] In some specific embodiments, a plurality of lattice column structures arranged at intervals are respectively disposed below the support 9 and the third inner support 6. Specifically, Figure 2 As shown, the lattice column structure includes a column 7, the top of which is fixed to the brace 9 or the third inner support 6 through a frame 8, and the bottom of the column 7 is fixed to a column foundation 14. The column foundation 14 is a reinforced concrete structure. The column foundation is embedded in the concrete cushion layer on the bottom surface of the later pedestal and serves as a part of it, thereby improving the mechanical properties of the bridge pedestal.

[0068] Based on the above embodiment, the following improvements are made: Figure 3 As shown, the utility model is connected with a frame corbel 17 at the connection between the column 7 and the opposite support 9 or the third inner support 6 to improve the stability of the connection between the column 7 and the opposite support 9 (or the third inner support 6).

[0069] When implementing it specifically, Figure 2 As shown, the purlin 2 is provided with three layers, namely the first purlin 11, the second purlin 12 and the third purlin 13. The first purlin 11, the second purlin 12 and the third purlin 13 are installed on the inner side of the steel sheet pile 1 from top to bottom as the excavation depth increases, and are fixed by welding the corbels 15.

[0070] In actual use, it should be noted that the steel sheet piles are first driven into the ground, and then the perimeter purlins and supporting structures are installed layer by layer. After all the installation is completed, lattice columns are set to reduce displacement and deformation to form a complete force system.

[0071] In the utility model, only the purlin and lattice column structure with built-in support components are used to ensure the supporting effect of the steel sheet piles. After the construction is completed, the lattice column structure serves as a part of the concrete cushion layer on the bottom side of the large-volume pedestal, thereby improving the mechanical properties of the large-volume pedestal. Compared with the past, the number of steel sheet piles used can be reduced, saving construction costs.

[0072] The utility model is not only structurally stable and low in manufacturing cost, but also highly operable. With the utility model, large-volume cap deep foundation pit construction can be completed safely and stably, cost controllable, easy to install, effectively reducing construction risks, and ensuring the safety requirements and construction efficiency of the deep foundation pit cofferdam.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A steel sheet pile cofferdam suitable for large-volume foundation construction, comprising a rectangular steel sheet pile (1), wherein the inner side of the steel sheet pile (1) is provided with multiple layers of surrounding purlins (2) arranged closely to the surface of the steel sheet pile (1) from top to bottom, characterized in that: A support assembly is arranged inside the enclosure purlin (2), and the support assembly comprises an inner support structure and a counter-support structure, wherein the counter-support structure is arranged on two opposite sides of the enclosure purlin (2) and is located in the middle of the enclosure purlin (2); four inner support structures are arranged symmetrically about the center of the counter-support structure, and the four inner support structures are respectively distributed at the four corners of the enclosure purlin (2); The inner support structure and the counter-support structure are both connected to a lattice column structure for vertical support, and a column foundation (14) is fixed at the bottom of the lattice column structure.

2. The steel sheet pile cofferdam suitable for large-volume cap construction as claimed in claim 1, characterized in that: The inner support structure comprises a first inner support (4), a second inner support (5) and a third inner support (6) which are arranged in sequence and in parallel and at intervals from the corner edge of the surrounding purlin (2) inwardly, and the two ends of the first inner support (4), the second inner support (5) and the third inner support (6) are respectively installed on two adjacent edges of the surrounding purlin (2).

3. The steel sheet pile cofferdam suitable for large-volume cap construction as claimed in claim 2, characterized in that: The bracing structure comprises a pair of parallel and spaced braces (9), the two braces (9) being symmetrical about the central axis of the purlin (2), and the two ends of each brace (9) being respectively mounted on two opposite sides of the purlin (2).

4. The steel sheet pile cofferdam suitable for large-volume cap construction as claimed in claim 1 is characterized in that: A plurality of transverse supports (10) are arranged between the two opposite supports (9), and the plurality of transverse supports (10) are arranged in parallel and at intervals.

5. The steel sheet pile cofferdam suitable for large-volume cap construction as claimed in claim 3, characterized in that: The opposing brace (9) and the third inner brace (6) are respectively connected to a plurality of lattice column structures arranged at intervals, the lattice column structure comprising a column (7), the top of the column (7) being fixed to the opposing brace (9) or the third inner brace (6) via a frame (8), the bottom of the column (7) being fixed to a column foundation (14), and the column foundation (14) being a reinforced concrete structure.

6. The steel sheet pile cofferdam suitable for large-volume cap construction as claimed in claim 5, characterized in that: A sash corbel (17) is connected to the connection between the upright column (7) and the counter support (9) or the third inner support (6).

7. The steel sheet pile cofferdam suitable for large-volume cap construction as claimed in claim 2, characterized in that: The connection between the surrounding purlin (2) and the steel sheet pile (1) of each layer is connected with an angle support (3), and the connection between the surrounding purlin (2) and the angle support (3), the first inner support (4), the second inner support (5), the third inner support (6) and the brace (9) are respectively provided with a first stiffening plate (18).

8. The steel sheet pile cofferdam suitable for large-volume cap construction as claimed in claim 1, characterized in that: The purlin (2) is provided with three layers, namely, a first purlin (11), a second purlin (12) and a third purlin (13). The first purlin (11), the second purlin (12) and the third purlin (13) are installed on the inner side of the steel sheet pile (1) in sequence from top to bottom as the excavation depth increases, and are fixed by welding corbels (15).

9. The steel sheet pile cofferdam suitable for large-volume cap construction as claimed in claim 2, characterized in that: The first inner support (4), the second inner support (5) and the third inner support (6) have the same structure, comprising steel pipe piles (16), double-jointed steel sections (19) and connecting steel plates (20), the two ends of the steel pipe piles (16) are respectively connected to connecting steel plates (20), the outer side of each connecting steel plate (20) is connected to a double-jointed steel section (19), and the double-jointed steel section (19) is fixedly connected to the surrounding purlin (2).

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