An interlocking pipe pile structure for cofferdams

Abstract

This utility model provides an interlocking pipe pile structure for cofferdams, comprising multiple pipe piles and multiple concrete connectors; the multiple pipe piles are arranged side by side, with a concrete connector between two adjacent pipe piles; the end of the concrete connector is connected to the pipe pile via a detachable slot structure; the detachable slot structure includes a guide groove, a sealing structure, a fixing structure, and a tenon structure. This interlocking pipe pile structure for cofferdams solves the problem that the flexible interlocking joints of steel sheet piles in related technologies are prone to cracking at the interlocking points under earth and water pressure, leading to cofferdam leakage or even disintegration.

Description

Technical Field

[0001] This utility model belongs to the field of prestressed pile technology, and in particular relates to an interlocking pipe pile structure for cofferdams. Background Technology

[0002] Steel sheet pile cofferdams, as the most commonly used form of sheet pile cofferdam, are constructed by interlocking steel sections (such as Larsen type and trough section) with interlocking joints. They have advantages such as high strength, strong adaptability to deep-water construction, and reusability, and are widely used in bridge caisson cofferdams, pipe pile foundations, and hydraulic structures. However, in large-scale hydraulic engineering scenarios (such as structural cofferdams), due to the huge construction area, it is impossible to set up supports. It is necessary to rely on the self-supporting structure of individual steel sheet piles combined with backfill to resist external forces. Because the flexible interlocking joints of steel sheet piles in related technologies are prone to cracking at the interlocking joints under the action of earth and water pressure, it is easy to cause cofferdam leakage or even disintegration. In order to maintain the stability of large units, it is necessary to fill the middle with soil and construct complex structures, which leads to extended construction period and high cost of corrosion protection when reusing steel. Summary of the Invention

[0003] In view of this, the present invention aims to at least partially solve one of the related technical problems.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] An interlocking pipe pile structure for cofferdams, comprising multiple pipe piles and multiple concrete connectors;

[0006] Multiple pipe piles are arranged side by side, and a concrete connector is provided between two adjacent pipe piles;

[0007] The end of the concrete connector is connected to the pipe pile via a detachable slot structure;

[0008] The detachable slot structure includes a guide groove, a sealing structure, a fixing structure, and a tenon structure. The guide groove is located on the side of the pipe pile, and the tenon structure is located at the end of the concrete connector. The tenon structure is integrally connected to the concrete connector and can slide inside the guide groove. The tenon structure is connected and fixed to the guide groove through the fixing structure. The sealing structure is located inside the guide groove and is used to seal the gap between the inner end face of the guide groove and the side end face of the tenon structure.

[0009] Furthermore, the tenon structure includes a tenon body and two grooves. The tenon body is integrally connected to the concrete connector. The front and rear ends of the tenon body are each provided with a groove. The guide groove has a C-shaped cross-section. The front and rear ends of the inner wall of the guide groove are each provided with a protruding tenon strip. The protruding tenon strip can cooperate with the groove.

[0010] Furthermore, the sealing structure includes an expansion water-stop pad and two expansion water-stop strips. The expansion water-stop pad is located between the middle of the guide groove and the side end face of the tenon body. The two expansion water-stop strips are symmetrically arranged and are located between the side of the tenon body and the guide groove.

[0011] Furthermore, the sealing structure also includes an epoxy sealant layer, which is disposed on the side end face of the tenon body.

[0012] Furthermore, the sealing structure also includes two water-swellable rubber membranes, which are disposed on the sidewall of the guide groove.

[0013] Furthermore, the fixing structure includes two stainless steel pull-out pins, and the tenon body is provided with a through hole that can cooperate with the stainless steel pull-out pins. The tenon body is connected to the pipe pile through the two stainless steel pull-out pins, and the stainless steel pull-out pins pass through the guide groove.

[0014] Compared with existing technologies, the interlocking pipe pile structure for cofferdams described in this utility model has the following advantages:

[0015] 1. The tenon slides along the C-shaped guide groove to ensure that the connector and the pipe pile are quickly and accurately aligned, avoiding misalignment during construction; the groove and the tenon strip fit together in both directions, limiting the horizontal deflection and vertical displacement of the connector, and enhancing the overall structural resistance to deformation.

[0016] 2. The expansion waterstop strip expands adaptively when exposed to water, continuously filling the dynamic gap between the tenon body and the groove; the epoxy sealant layer forms a permanent adhesive sealing film, and the secondary expansion of the rubber film provides redundant water-stopping protection.

[0017] 3. The pull-out pin transforms the pipe pile and connector into an integral load-bearing unit, suppressing relative slippage under impact loads. Attached Figure Description

[0018] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0019] Figure 1 This is a schematic diagram of an interlocking pipe pile structure for a cofferdam, as described in an embodiment of this utility model;

[0020] Figure 2 This is a schematic diagram of the guide groove structure described in an embodiment of the present utility model;

[0021] Figure 3 This is a schematic diagram of the tenon structure described in an embodiment of the present utility model;

[0022] Figure 4 This is a schematic diagram of the combined guide structure and tenon structure described in an embodiment of the present utility model;

[0023] Figure 5 This is a top view of the interlocking pipe pile structure described in an embodiment of this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] 100, Pipe pile; 200, Concrete connector; 310, Guide groove; 320, Tenon strip; 330, Expansion waterstop pad; 410, Tenon body; 420, Groove; 421, Through hole; 500, Fixing structure. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0027] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 utility model based on the specific circumstances.

[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] An interlocking pipe pile structure for cofferdams, such as Figure 1 As shown, the system includes multiple pipe piles 100 and multiple concrete connectors 200. The multiple pipe piles 100 are arranged side by side, and a concrete connector 200 is set between two adjacent pipe piles 100. The end of the concrete connector 200 is connected to the pipe pile 100 through a detachable slot structure. The detachable slot structure includes a guide groove 310, a sealing structure, a fixing structure 500, and a tenon structure. The guide groove 310 is located on the side of the pipe pile 100, and the tenon structure is located at the end of the concrete connector 200. The tenon structure is integrally connected to the concrete connector 200 and can slide inside the guide groove 310. The tenon structure is connected and fixed to the guide groove 310 through the fixing structure 500. The sealing structure is located inside the guide groove 310 and is used to seal the gap between the inner end face of the guide groove 310 and the side end face of the tenon structure.

[0031] The tenon structure includes a tenon body 410 and two grooves 420. The tenon body 410 is integrally connected to the concrete connector 200. A groove 420 is provided on both the front and rear ends of the tenon body 410. The guide groove 310 has a C-shaped cross-section, and a tenon strip 320 is provided on both the front and rear ends of the inner wall of the guide groove 310. The tenon strip 320 can mate with the grooves 420. The tenon body 410 slides along the C-shaped guide groove 310, ensuring quick and accurate alignment between the connector and the pipe pile 100, avoiding construction misalignment. The grooves 420 and the tenon strips 320 engage bidirectionally, limiting the horizontal deflection and vertical displacement of the connector, enhancing the overall structural resistance to deformation.

[0032] The sealing structure includes an expansion sealing pad 330 and two expansion sealing strips. The expansion sealing pad 330 is located between the middle of the guide groove 310 and the side end face of the tenon body 410. The two expansion sealing strips are symmetrically arranged between the side of the tenon body 410 and the guide groove 310. The sealing structure also includes an epoxy sealant layer, which is applied to the side end face of the tenon body 410. The sealing structure also includes two water-swellable rubber membranes, which are applied to the side wall of the guide groove 310. The expansion sealing strips expand adaptively upon contact with water, continuously filling the dynamic gap between the tenon and the groove; the epoxy sealant layer forms a permanently bonded sealing film, and the secondary expansion of the rubber membranes provides redundant water-stopping protection.

[0033] The interlocking pipe pile structure uses a rigid tenon-and-mortise connection structure to replace the flexible interlocking joints of traditional steel sheet piles. Shear loads are transferred through the mechanical interlocking of the groove 420 and the tenon 320, avoiding sealing failure caused by interlocking joint deformation. The concrete connector 200 end is equipped with multiple sealing components, including water-swellable material, an epoxy sealing layer, and grout filler, forming a progressive seepage barrier that significantly reduces the risk of cofferdam leakage. After assembly, the pipe pile 100 and the connector form a self-stabilizing frame system, using the self-weight of the pipe pile 100 and the rigidity of the nodes to resist overturning moments, eliminating the need for backfill support and simplifying the construction process for large cofferdams. The all-concrete structure avoids steel corrosion problems and extends the service life of the cofferdam. It systematically solves the defects of traditional technologies—interlocking joint cracking, reliance on backfill, and corrosion protection—from three aspects: structural form, waterproofing mechanism, and construction logic.

[0034] The fixing structure 500 includes two stainless steel pull-out pins. The tenon body 410 is provided with a through hole 421 that can mate with the stainless steel pull-out pins. The tenon body 410 is connected to the pipe pile 100 through the two stainless steel pull-out pins, and the stainless steel pull-out pins pass through the guide groove 310. The pull-out pins transform the pipe pile 100 and the connector into an integral force-bearing unit, suppressing relative slippage under impact loads.

[0035] How this example works

[0036] Step 1: At the predetermined cofferdam axis position, a static pressure pile driver is used to vertically press the prestressed concrete pipe piles 100 into the foundation; during the pile driving process, the plane position and elevation of the guide chute 310 are calibrated in real time using a laser rangefinder to ensure that the spacing error between adjacent pipe piles 100 is controlled within the allowable range.

[0037] Step 2: Construct the following on the prefabricated concrete connector 200mm tenon surface in sequence:

[0038] 1. Apply an epoxy sealant layer to cover the 410 side end face of the tenon body;

[0039] 2. Inlay expansion sealing strips at the edges of the grooves 420 on both sides of the tenon body 410;

[0040] 3. Wrap a water-swellable rubber membrane around the sliding contact surface of the tenon.

[0041] Step 3: Use hoisting equipment to horizontally lift the concrete connector 200 between adjacent pipe piles 100; operate the hydraulic booster to push the connector so that its tenon slides inward along the C-shaped guide groove 310 of the pipe pile 100; achieve three-dimensional spatial positioning through the engagement of the groove 420 and the protruding tenon 320 in the guide groove 310.

[0042] Step 4: After the tenon is fully inserted, the expansion water-stop pad 330 is squeezed and fills the gap in the middle of the guide groove 310; water is injected to activate the water-swellable rubber membrane, which expands and fills the gap between the tenon and the side wall of the groove; the expansion water-stop strip is stretched outwards under the action of the compressive force to seal the end face joint.

[0043] Step 5: Vertically drive a stainless steel pull-out pin into the pre-set pin hole position of the guide groove 310, so that it penetrates the through hole 421 of the pipe pile 100 wall and the tenon body 410; apply a predetermined tightening force with a torque wrench to form a double-point rigid anchor.

[0044] Step 6: High-pressure injection of cement-based penetrating crystallizing material through the grouting hole 310 of the guide groove to fill the residual micro-voids around the tenon; after grouting is completed, the grouting hole is sealed to form a composite waterproof barrier of epoxy sealant layer and grouting body.

[0045] Step 7: Repeat steps 1 to 6, expanding segment by segment along the cofferdam axis using "pile-connector-pile" as the basic unit; achieve cofferdam closure of broken lines or curves through corner connectors.

[0046] Step 8: Overall Seepage Prevention Acceptance

[0047] After the cofferdam is closed, water is continuously injected to the design water level, and the leakage of 100 pipe piles is detected. Quick-setting epoxy grout is injected to replenish local seepage points until the cofferdam seepage prevention design standards are met.

[0048] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A chain-tube pile structure for a cofferdam, characterized by: Includes multiple pipe piles (100) and multiple concrete connectors (200); Multiple pipe piles (100) are arranged side by side, and a concrete connector (200) is provided between two adjacent pipe piles (100); The end of the concrete connector (200) is connected to the pipe pile (100) via a detachable slot structure; The detachable slot structure includes a guide groove (310), a sealing structure, a fixing structure (500), and a tenon structure. The guide groove (310) is located on the side of the pipe pile (100), and the tenon structure is located at the end of the concrete connector (200). The tenon structure is integrally connected to the concrete connector (200). The tenon structure can slide inside the guide groove (310). The tenon structure is connected and fixed to the guide groove (310) through the fixing structure (500). The sealing structure is located inside the guide groove (310) and is used to seal the gap between the inner end face of the guide groove (310) and the side end face of the tenon structure.

2. A chain tie structure for cofferdams as claimed in claim 1, wherein: The tenon structure includes a tenon body (410) and two grooves (420). The tenon body (410) is integrally connected with the concrete connector (200). The front and rear ends of the tenon body (410) are each provided with a groove (420). The guide groove (310) has a C-shaped cross section. The front and rear ends of the inner wall of the guide groove (310) are each provided with a tenon strip (320). The tenon strip (320) can cooperate with the groove (420).

3. A chain tie structure for cofferdams as claimed in claim 2, wherein: The sealing structure includes an expansion water-stop pad (330) and two expansion water-stop strips. The expansion water-stop pad (330) is located between the middle of the guide groove (310) and the side end face of the tenon body (410). The two expansion water-stop strips are symmetrically arranged and are located between the side of the tenon body (410) and the guide groove (310).

4. A chain tie structure for cofferdams as claimed in claim 3, wherein: The sealing structure also includes an epoxy sealant layer, which is disposed on the side end face of the tenon body (410).

5. A chain tie structure for cofferdams according to any one of claims 3 or 4, characterised in that: The sealing structure also includes two water-swellable rubber membranes, which are disposed on the sidewall of the guide groove (310).

6. A chain tie structure for cofferdams as claimed in claim 5, wherein: The fixing structure (500) includes two stainless steel pull-out pins. The tenon body (410) is provided with a through hole (421) that can cooperate with the stainless steel pull-out pins. The tenon body (410) is connected to the pipe pile (100) through the two stainless steel pull-out pins. The stainless steel pull-out pins pass through the guide groove (310).

Images