Locking steel pipe pile socket joint type notch cofferdam structure

Abstract

The utility model discloses a lock catch steel pipe pile socket type notched cofferdam structure, and the periphery of cofferdam is surrounded by a plurality of lock catch steel pipes, and the inside of cofferdam is provided with supporting steel pipes, and cofferdam is paved with cement bottom seal, and the cement bottom seal is provided with construction pile hole and bearing platform, cofferdam is provided with reserved cement groove, and the reserved cement groove extends to the opposite sides of cofferdam, and the reserved cement groove is provided with receiving notches along the extension direction, the lock catch steel pipe can be inserted into the receiving notches and is buckled with the lock catch steel pipes of the opposite sides of cofferdam, and the receiving notches are grouted with mortar. The utility model discloses, and the standardization design of reserved notch makes cofferdam extension construction not need on -the -spot cutting reconstruction, which shortens construction period and reduces material loss, and is especially suitable for the continuous construction scene of many bearing platforms in the beach deep water area.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction technology, and in particular to a lockable steel pipe pile socket-type grooved cofferdam structure. Background Technology

[0002] In the construction of deep-buried bridge pier caps across major rivers located on floodplains, cofferdams are an indispensable temporary structure to ensure slope stability and effective water stoppage during construction. Currently, in China, technologies such as concrete caisson cofferdams, double-walled steel cofferdams, sheet pile cofferdams, interlocked steel pipe pile cofferdams, and bored pile cofferdams are commonly used for constructing deep foundation pit pier caps. However, interlocked steel pipe pile cofferdams have limitations.

[0003] Existing technology for interlocking steel pipe pile cofferdams involves an outer perimeter constructed from several interlocking steel pipes, with supporting steel pipes inside and a concrete bottom lining. The cofferdam is used for constructing pile holes, foundations, and piers. When construction of a foundation in one area is completed, and construction of an adjacent foundation is needed, the cofferdam needs to be extended on one side to widen the construction area for another foundation and pier. This process requires additional interlocking steel pipes to be spliced ​​into the existing interlocking steel pipes of the cofferdam. However, on existing structures such as foundations or existing interlocking steel pipes, the newly spliced ​​interlocking steel pipes are difficult to anchor stably, precise positioning is challenging, and the water-stopping effect is poor. Therefore, further improvements are needed. Utility Model Content

[0004] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes a locking steel pipe pile socket-type trench cofferdam structure.

[0005] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: a locking steel pipe pile socket-type grooved cofferdam structure, the cofferdam is surrounded by a number of locking steel pipes, the cofferdam is equipped with supporting steel pipes inside, the cofferdam is filled with concrete for sealing the bottom, and the concrete for sealing the bottom is equipped with construction pile holes and pile caps; the cofferdam is equipped with a reserved concrete groove, which extends to the opposite sides of the cofferdam; the reserved concrete groove is equipped with a receiving groove along the extension direction; the locking steel pipe can be inserted into the receiving groove and locked with the locking steel pipes on the opposite sides of the cofferdam; the receiving groove is filled with mortar.

[0006] Optionally, the reserved concrete trough can be installed above the foundation.

[0007] Optionally, the receiving groove has an inverted "П"-shaped elongated groove structure.

[0008] Optionally, the reserved concrete trough is made of reinforced concrete.

[0009] Optionally, the cofferdam is arranged in a rectangular ring structure; the reserved concrete trough is arranged within the cofferdam along the width direction.

[0010] Optionally, the support platform is configured as a rectangular base structure.

[0011] Optionally, a plurality of construction pile holes are provided, evenly distributed below the pile cap.

[0012] Optionally, a sealing concrete is provided between the pier and the cofferdam.

[0013] Optionally, the cofferdam is provided with at least two layers of supporting steel pipes along its longitudinal direction.

[0014] The beneficial effects of this utility model are as follows: By pre-embedded in the concrete bottom of the cofferdam with a receiving groove, the precise insertion and anchoring of the new and old interlocking steel pipe piles are achieved, effectively improving the overall stability of the structure; the tight interlocking interface formed by the receiving groove and the interlocking steel pipe, after being sealed with mortar, forms multiple water-stop barriers, greatly enhancing the seepage prevention performance at the joint; the standardized design of the pre-embedded groove eliminates the need for on-site cutting and modification during cofferdam extension construction, shortening the construction cycle and reducing material waste, making it particularly suitable for continuous construction scenarios with multiple foundations in deep water areas of tidal flats; in addition, this structure, through a combination of prefabrication and cast-in-place methods, retains the advantages of traditional interlocking steel pipe cofferdams in terms of high rigidity and strong support, while innovatively solving the connection problem of existing structures, possessing comprehensive technical advantages of convenient construction, controllable quality, and economic and environmental protection.

[0015] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0017] Figure 1 This is a schematic diagram showing the result of constructing the cofferdam in the first area according to this utility model;

[0018] Figure 2 This is a schematic diagram of the locking steel pipe for the first area of ​​the cofferdam demolition of this utility model, assuming a pre-reserved concrete trough.

[0019] Figure 3 This is a schematic diagram of the structure of the cofferdam after it is extended towards the second region according to this utility model;

[0020] Figure 4 for Figure 2 A schematic diagram of the structure of AA.

[0021] Explanation of key component symbols:

[0022] 10. Cofferdam; 20. Locking steel pipe; 30. Supporting steel pipe; 40. Construction pile hole; 50. Bottom sealing concrete; 60. Pier; 70. Bridge pier; 80. Reserved concrete trench; 81. Receiving trench. Detailed Implementation

[0023] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0024] In the description of this utility model, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.

[0025] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In this utility model, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0027] Example

[0028] Reference Figures 1 to 4The present invention proposes a locking steel pipe 20 pile socket type groove cofferdam 10 structure. The cofferdam 10 is surrounded by a number of locking steel pipes 20. The cofferdam 10 is equipped with supporting steel pipes 30 inside. The bottom of the cofferdam 10 is covered with concrete, and the bottom of the concrete is equipped with construction pile holes 40 and pile caps 60. The pile caps 60 are used to arrange bridge piers 70. The cofferdam 10 is equipped with a reserved concrete groove 80, which extends to the opposite sides of the cofferdam 10. The reserved concrete groove 80 is provided with a receiving groove 81 along the extension direction. The locking steel pipes 20 can be inserted into the receiving groove 81 and locked with the locking steel pipes 20 on the opposite sides of the cofferdam 10. The receiving groove 81 is filled with mortar.

[0029] The beneficial effects of this utility model are as follows: By pre-embedded in the concrete bottom of the cofferdam 10 with a reserved concrete groove with a receiving groove 81, the precise insertion and anchoring of the new and old interlocking steel pipe 20 piles are achieved, effectively improving the overall stability of the structure; the tight interlocking interface formed by the receiving groove 81 and the interlocking steel pipe 20 forms multiple water-stop barriers after being sealed with mortar, greatly enhancing the seepage prevention performance at the joint; the standardized design of the reserved groove means that there is no need for on-site cutting and modification during the extension construction of the cofferdam 10, which shortens the construction cycle and reduces material consumption, and is particularly suitable for continuous construction scenarios with multiple pile caps 60 in deep water areas of tidal flats; in addition, this structure, through the combination of prefabrication and cast-in-place methods, not only retains the advantages of the traditional interlocking steel pipe 20 cofferdam 10 in terms of high rigidity and strong support, but also innovatively solves the problem of existing structural connection, and has comprehensive technical advantages of convenient construction, controllable quality, economy and environmental protection.

[0030] In this embodiment, the reserved concrete trough 80 can be installed above the foundation 60. The reserved concrete trough installed above the foundation 60 can avoid conflict between the reserved trough and the existing foundation 60 structure, and can also use the self-weight of the foundation 60 to enhance the anchoring stability of the reserved trough.

[0031] In this embodiment, the receiving groove 81 is an inverted "П"-shaped elongated groove structure. The cross-section of the inverted "П"-shaped elongated groove matches the outer contour height of the locking steel pipe 20, increasing the contact area between the steel pipe and the groove, and improving shear resistance through the complementary interlocking of geometric shapes.

[0032] In this embodiment, the reserved concrete trough 80 is made of reinforced concrete. The precast reserved trough is made of reinforced concrete, and the internal reinforcement enhances the bending stiffness of the trough, avoiding trough deformation caused by deep water pressure or soil compression. The synergistic effect of concrete and steel can disperse local stress and extend the service life of the trough, which is especially suitable for the engineering needs of repeatedly extending the cofferdam 10 under the complex geological conditions of the tidal flat area.

[0033] In this embodiment, the cofferdam 10 is arranged in a rectangular ring structure; a pre-reserved concrete trough 80 is set inside the cofferdam 10 along the width direction. The rectangular ring structure of the cofferdam 10 forms a closed force system, which, together with the pre-reserved trough in the width direction, allows the newly added steel pipe piles to be symmetrically distributed on both sides during the extension construction of the cofferdam 10, maintaining the overall center of gravity balance of the cofferdam 10; the regular internal space of the ring structure is conducive to the arrangement of the supporting steel pipe 30 system and the positioning of the pile cap 60, improving the stability during the deep foundation pit excavation stage.

[0034] Furthermore, the pier cap 60 is designed as a rectangular base. The rectangular pier cap 60 and the rectangular annular cofferdam 10 are spatially adapted to each other, optimizing the transmission path of the supporting force within the cofferdam 10.

[0035] In this embodiment, several construction pile holes 40 are provided and evenly distributed below the pile cap 60. The even distribution of the construction pile holes 40 below the pile cap 60 ensures that the pile load is evenly transferred to the foundation, avoiding differential settlement caused by local stress concentration.

[0036] Specifically, a bottom sealing concrete layer 50 is installed between the foundation 60 and the cofferdam 10. The bottom sealing concrete layer 50 between the foundation 60 and the cofferdam 10 fills the structural gap and forms a continuous waterproof interface to prevent groundwater from seeping into the foundation pit along the inner wall of the cofferdam 10.

[0037] In this embodiment, the cofferdam 10 is provided with at least two layers of supporting steel pipes 30 along the longitudinal direction. The longitudinal multi-layer supporting steel pipes 30 form a three-dimensional support frame, which constrains the lateral deformation of the cofferdam 10 by layer and adapts to the high water and soil pressure during the construction of the deep-buried foundation 60; the multi-layer support can apply prestress in sections, dynamically adjust the stress state of the cofferdam 10, avoid the overload failure of a single layer support, and significantly improve the safety of deep foundation pit excavation.

[0038] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.

Claims

1. A locking steel pipe pile socket-type trench cofferdam structure, wherein the outer perimeter of the cofferdam (10) is constructed by splicing several locking steel pipes (20), and the interior of the cofferdam (10) is provided with supporting steel pipes (30). The cofferdam (10) is filled with concrete for sealing the bottom, and the concrete for sealing the bottom is provided with construction pile holes (40) and pile caps (60); characterized in that, The cofferdam (10) is provided with a reserved concrete trough (80), which extends to the opposite sides of the cofferdam (10); the reserved concrete trough (80) is provided with a receiving slot (81) along the extension direction; the locking steel pipe (20) can be inserted into the receiving slot (81) and fastened with the locking steel pipe (20) on the opposite sides of the cofferdam (10); the receiving slot (81) is filled with mortar.

2. The interlocking steel pipe pile socket-type trench cofferdam structure according to claim 1, characterized in that: The reserved concrete trough (80) can be installed above the foundation (60).

3. The interlocking steel pipe pile socket-type trench cofferdam structure according to claim 1, characterized in that: The receiving slot (81) has an inverted "П"-shaped long slot structure.

4. The interlocking steel pipe pile socket-type trench cofferdam structure according to claim 1, characterized in that: The reserved concrete trough (80) is made of reinforced concrete.

5. The interlocking steel pipe pile socket-type trench cofferdam structure according to claim 1, characterized in that: The cofferdam (10) is arranged in a rectangular ring structure; the reserved concrete trough (80) is arranged in the cofferdam (10) along the width direction.

6. The interlocking steel pipe pile socket-type trench cofferdam structure according to claim 5, characterized in that: The support platform (60) is a rectangular base structure.

7. The interlocking steel pipe pile socket-type trench cofferdam structure according to claim 6, characterized in that: Several construction pile holes (40) are provided and are evenly arranged below the pile cap (60).

8. The interlocking steel pipe pile socket-type trench cofferdam structure according to claim 6, characterized in that: A sealing concrete (50) is provided between the pier (60) and the cofferdam (10).

9. The interlocking steel pipe pile socket-type trench cofferdam structure according to claim 1, characterized in that: The cofferdam (10) is provided with at least two layers of supporting steel pipes (30) along the longitudinal direction.

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