Locking steel pipe pile cofferdam water retaining construction structure with high resistance to water flow impact force
By increasing the rock penetration depth in the cofferdam structure, setting up multiple layers of walers and internal supports, strengthening piles and water-stopping materials, the problem of insufficient water-blocking capacity of the cofferdam structure was solved, and the stability and safety against water flow impact were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SICHUAN ROAD & BRIDGE CONSTRUCTION GROUP CO LTD
- Filing Date
- 2024-11-28
- Publication Date
- 2026-05-29
AI Technical Summary
The existing cofferdam structure has poor water-blocking capacity and is easily collapsed by water flow, posing a safety hazard.
The TC-type interlocking steel pipe pile cofferdam structure is adopted to increase the rock penetration depth to more than 2m. Two layers of walers are set up, and internal supports are set in the longitudinal and diagonal directions. Combined with reinforcing piles and stiffening lining plates, mixed water-stopping materials are used for dense filling, and pebbles are backfilled on the outside and a water collection pit is set up.
It improves the integrity and stability of the cofferdam structure, prevents water flow from causing it to collapse, ensures construction safety, and enhances the water-stopping effect and overall load-bearing capacity.
Smart Images
Figure CN224300014U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bridge construction structures, and in particular to a water-retaining construction structure for a locking steel pipe pile cofferdam with strong resistance to water flow impact. Background Technology
[0002] Cofferdam construction refers to the temporary retaining structure built in water conservancy projects to construct permanent water conservancy facilities. Its function is to prevent water and soil from entering the construction site of the structure, so as to facilitate drainage, excavation of foundation pits, and construction of structures within the cofferdam. It is generally used in hydraulic engineering. Except when used as part of a formal building, the cofferdam is usually dismantled after use. The height of the cofferdam is higher than the highest water level that may occur during the construction period.
[0003] The existing cofferdam structure is simple and has poor water-blocking capacity, making it prone to collapse and seepage. This is not conducive to the steady progress of construction and poses significant safety hazards. In order to solve the above problems, it is necessary to improve the existing cofferdam water-blocking structure. Utility Model Content
[0004] The purpose of this utility model is to provide a locking steel pipe pile cofferdam construction structure with strong resistance to water flow impact, and to solve the problem that existing cofferdam water-retaining structures are prone to collapse due to water flow impact.
[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0006] A water-retaining construction structure for a cofferdam with interlocking steel pipe piles and strong resistance to water flow impact includes TC-type interlocking steel pipe piles, walers, and internal supports. The TC-type interlocking steel pipe piles are arranged around the foundation, and the rock penetration depth of the TC-type interlocking steel pipe piles is greater than 2m. The walers are horizontally arranged inside the TC-type interlocking steel pipe piles, and the walers have two layers. The internal supports include longitudinal internal supports and diagonal braces. The longitudinal internal supports are horizontally arranged in the middle of the rectangular structure formed by the walers, and transverse horizontal support rods are also provided between the longitudinal internal supports. The diagonal braces are located at the four corners of the rectangular structure formed by the walers, and diagonal braces are also provided on the outer side of the outermost longitudinal internal support and between it and the waler connected to it.
[0007] The main reasons for the problems described in the background art are: firstly, the existing steel pipe piles do not penetrate deep enough into the rock; secondly, the walers are relatively thin, usually only one layer; and thirdly, only diagonal bracing is installed at the four corners as internal support, without longitudinal internal support, resulting in poor overall integrity of the entire steel pipe pile cofferdam structure. To address these issues, the existing steel pipe pile cofferdam structure was improved. Firstly, the rock penetration depth was increased to over 2 meters; secondly, two layers of walers were installed; and finally, in addition to longitudinal internal support, diagonal bracing was installed at the four corners of the rectangle formed by the walers. Diagonal bracing was also installed on the outer side of the outermost longitudinal internal support and between it and the connected walers, resulting in good overall integrity of the steel pipe pile cofferdam structure and making it less susceptible to collapse due to water flow.
[0008] As a further preferred embodiment of this utility model, the TC-type interlocking steel pipe pile includes a straight section steel pipe pile and a corner steel pipe pile. The T-shaped insertion structure and C-shaped interlocking structure of the straight section steel pipe pile are located on opposite sides of the steel pipe pile body, while the T-shaped insertion structure and C-shaped interlocking structure of the corner steel pipe pile are located on adjacent sides of the steel pipe pile body.
[0009] As a further preferred embodiment of this utility model, the C-shaped locking structure is welded to the steel pipe pile body, and stiffening lining plates are also welded between the two sides of the C-shaped locking structure and the steel pipe pile body.
[0010] The added stiffening liner improves the stability between the C-type interlocking structure and the steel pipe pile body.
[0011] As a further preferred embodiment of this utility model, the lower part of the TC-type interlocking steel pipe pile is provided with a reinforcement section, the reinforcement section extending upward 1m from the bottom surface of the TC-type interlocking steel pipe pile, and the reinforcement section is covered with at least 3 or more arc-shaped steel plates inside and outside.
[0012] The TC-type interlocking steel pipe piles were locally reinforced, which not only prevented the inaccurate driving depth data caused by the deformation of the bottom of the TC-type interlocking steel pipe piles during the driving process, but also saved costs because the reinforcement was only localized.
[0013] As a further preferred embodiment of this utility model, the TC-type lock-lock steel pipe pile jump section located on the upstream side is a reinforcing pile, and the chamfer of the lock-lock steel pipe pile cofferdam structure and the inner support connection of the lock-lock steel pipe pile cofferdam structure are also reinforcing piles.
[0014] To ensure the overturning resistance of the interlocked steel pipe pile cofferdam structure, as well as the overall stability during cofferdam construction and safety during floods, reinforcing piles were installed. The so-called "skip pile" means that a reinforcing pile is installed every other ordinary TC type interlocked steel pipe pile.
[0015] As a further preferred embodiment of this utility model, the reinforcing pile is a TC-type interlocking steel pipe pile in which concrete is poured into the steel pipe pile body, and the pouring height of the concrete is not less than 1.5m.
[0016] The reinforced piles are drilled using an impact drill, followed by a vibratory hammer until it can no longer be driven. After the drilled hole is in place, underwater concrete is poured.
[0017] As a further preferred embodiment of this utility model, the C-shaped interlocking structure of the TC-type interlocking steel pipe pile is filled with water-stopping material.
[0018] The water-stopping material is a mixture of clay, bentonite, yellow sand, and sawdust in a volume ratio of 6:1:1:1. During filling, the water-stopping material is placed in a plastic bag and inserted into the C-type interlocking structure hole of the TC-type interlocking steel pipe pile. When driving, the T-type insertion structure will tear the plastic bag, and the water-stopping material will be compacted by the excitation force of the vibratory hammer. After the pile is driven into place, the missing water-stopping material section in the C-type interlocking structure due to vibration subsidence will be manually filled and compacted with a steel rod. This structure has a good water-stopping effect.
[0019] As a further preferred embodiment of this utility model, the waler is welded to the TC-type interlocking steel pipe pile, with a weld length of 20mm and a weld height of 10mm. Vertically arranged reinforcing connecting plates are also provided on both sides of the side of the TC-type interlocking steel pipe pile connected to the waler.
[0020] It can ensure effective support.
[0021] As a further preferred embodiment of this utility model, the outer side of the interlocking steel pipe pile cofferdam structure, which consists of TC-type interlocking steel pipe piles, walers, and inner supports, is backfilled with outer pebbles, which are covered by gabion mesh. The inner side of the interlocking steel pipe pile cofferdam structure is backfilled with perforated drill cuttings, inner pebbles, and bottom sealing concrete arranged sequentially from bottom to top.
[0022] Before backfilling, ensure that the backfill height of the sand inside the TC type interlocking steel pipe pile is greater than the backfill height of the interlocking steel pipe pile cofferdam structure. This will prevent local deformation of the TC type interlocking steel pipe pile due to backfilling.
[0023] Backfilling ensures that the overall stress distribution of the interlocked steel pipe pile cofferdam structure and prevents erosion of the foundation, resulting in higher stability.
[0024] As a further preferred embodiment of this utility model, the interlocking steel pipe pile cofferdam structure, which consists of TC-type interlocking steel pipe piles, walers, and internal supports, is also provided with a water collection pit.
[0025] It facilitates the pumping out of water accumulated inside the cofferdam structure made of interlocking steel pipe piles.
[0026] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:
[0027] 1. First, the rock penetration depth was set to more than 2m. Then, two layers of walers were installed. Finally, not only were longitudinal inner supports installed, but diagonal braces were also installed at the four corners of the rectangle formed by the walers. Diagonal braces were also installed on the outer side of the longitudinal inner support at the outermost end and between it and the walers connected to it. This made the steel pipe pile cofferdam structure have good integrity and was not easily collapsed by water flow.
[0028] 2. The added stiffening liner improves the stability between the C-type interlocking structure and the steel pipe pile body.
[0029] 3. The TC-type interlocking steel pipe piles were locally reinforced, which not only prevented the inaccurate driving depth data caused by the deformation of the bottom of the -C-type interlocking steel pipe piles during the driving process, but also saved costs because the reinforcement was only localized.
[0030] 4. To ensure the overturning resistance of the interlocked steel pipe pile cofferdam structure, as well as the overall stability during the construction of the cofferdam and its safety during floods, reinforcing piles were installed.
[0031] 5. The water-stopping material is a mixture of clay, bentonite, yellow sand, and sawdust in a volume ratio of 6:1:1:1. During filling, the water-stopping material is placed in a plastic bag and inserted into the C-type interlocking structure hole of the TC-type interlocking steel pipe pile. When driving, the T-type insertion structure will tear the plastic bag. The vibration force of the vibratory hammer is used to compact the water-stopping material. After the pile is driven into place, the missing water-stopping material section in the C-type interlocking structure due to vibration subsidence is manually filled and compacted with a steel rod. This structure has a good water-stopping effect.
[0032] 6. The reinforced connecting plate ensures effective support.
[0033] 7. Backfilling ensures that the overall stress of the interlocked steel pipe pile cofferdam structure is maintained and that the foundation is not eroded, resulting in higher stability.
[0034] 8. Facilitates the drainage of water accumulated inside the locking steel pipe pile cofferdam structure. Attached Figure Description
[0035] Figure 1 This is a schematic diagram of the structure of this utility model.
[0036] Figure 2 This is a structural schematic diagram of the TC-type interlocking steel pipe pile of this utility model.
[0037] Figure 3 This is a schematic diagram of the connection structure between the waler and the TC-type interlocking steel pipe pile of this utility model.
[0038] Figure 4This is a schematic diagram of the backfill structure on the inner and outer sides of the locking steel pipe pile cofferdam structure of this utility model. Detailed Implementation
[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.
[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0041] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.
[0042] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0043] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used 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. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0044] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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. Specific Implementation Example 1:
[0046] Figure 1 , Figure 2 , Figure 3 , Figure 4 This paper presents a water-retaining construction structure for a cofferdam made of interlocking steel pipe piles with strong resistance to water flow impact. The structure includes TC-type interlocking steel pipe piles 1, walers 2, and inner supports 3. The TC-type interlocking steel pipe piles 1 are arranged around the foundation and have a rock penetration depth greater than 2m. The walers 2 are horizontally arranged inside the TC-type interlocking steel pipe piles 1 and have two layers. The inner supports 3 include longitudinal inner supports 31 and diagonal braces 32. The longitudinal inner supports 31 are arranged horizontally along the longitudinal direction in the middle of the rectangular structure formed by the walers 2. Transverse horizontal support rods 4 are also provided between the longitudinal inner supports 31. The diagonal braces 32 are arranged at the four corners of the rectangular structure formed by the walers 2. Diagonal braces 32 are also provided on the outer side of the outermost longitudinal inner support 31 and between it and the waler 2 connected to it.
[0047] The main reasons for the problems described in the background art are: firstly, the existing steel pipe piles do not penetrate deep enough into the rock; secondly, the walers are relatively thin, usually only one layer; and thirdly, only diagonal bracing is installed at the four corners as internal support, without longitudinal internal support, resulting in poor overall integrity of the entire steel pipe pile cofferdam structure. To address these issues, the existing steel pipe pile cofferdam structure was improved. Firstly, the rock penetration depth was increased to over 2 meters; secondly, two layers of walers were installed; and finally, in addition to longitudinal internal support, diagonal bracing was installed at the four corners of the rectangle formed by the walers. Diagonal bracing was also installed on the outer side of the outermost longitudinal internal support and between it and the connected walers, resulting in good overall integrity of the steel pipe pile cofferdam structure and making it less susceptible to collapse due to water flow. Specific Implementation Example 2:
[0049] This embodiment further describes the TC-type interlocking steel pipe pile 1 based on specific embodiment 1. The TC-type interlocking steel pipe pile 1 includes straight section steel pipe piles and corner steel pipe piles. The T-shaped insertion structure 11 and C-shaped interlocking structure 12 of the straight section steel pipe pile are located on opposite sides of the steel pipe pile body 13, respectively. The T-shaped insertion structure 11 and C-shaped interlocking structure 12 of the corner steel pipe pile are located on adjacent sides of the steel pipe pile body 13, respectively. Specific Implementation Example 3:
[0051] This embodiment further describes the C-type locking structure 12 based on specific embodiment 1. The C-type locking structure 12 is welded to the steel pipe pile body 13, and stiffening lining plates 5 are also welded between the two sides of the C-type locking structure 12 and the steel pipe pile body 13.
[0052] The added stiffening liner improves the stability between the C-type interlocking structure and the steel pipe pile body. Specific Implementation Example 4:
[0054] This embodiment further describes the TC-type interlocking steel pipe pile 1 based on specific embodiment 1. The lower part of the TC-type interlocking steel pipe pile 1 is provided with a reinforcement section. The range of the reinforcement section extends upward from the bottom surface of the TC-type interlocking steel pipe pile 1 by 1m. The reinforcement section is covered with at least 3 or more arc-shaped steel plates inside and outside.
[0055] The TC-type interlocking steel pipe piles were locally reinforced, which not only prevented the inaccurate driving depth data caused by the deformation of the bottom of the TC-type interlocking steel pipe piles during the driving process, but also saved costs because the reinforcement was only localized. Specific Implementation Example 5:
[0057] This embodiment further explains the TC-type interlocking steel pipe pile 1 based on specific embodiment 1. The TC-type interlocking steel pipe pile 1 jump section located on the upstream side is a reinforcing pile. The chamfer of the interlocking steel pipe pile cofferdam structure and the inner support connection of the interlocking steel pipe pile cofferdam structure are also reinforcing piles.
[0058] To ensure the overturning resistance of the interlocked steel pipe pile cofferdam structure, as well as the overall stability during cofferdam construction and safety during floods, reinforcing piles were installed. The so-called "skip pile" means that a reinforcing pile is installed every other ordinary TC type interlocked steel pipe pile. Specific Implementation Example 6:
[0060] This embodiment further illustrates the reinforced pile based on specific embodiment 5. The reinforced pile is a TC-type interlocked steel pipe pile in which concrete is poured into the steel pipe pile body of the TC-type interlocked steel pipe pile 1, and the pouring height of the concrete is not less than 1.5m.
[0061] The reinforced piles are drilled using an impact drill, followed by a vibratory hammer until it can no longer be driven. After the drilled hole is in place, underwater concrete is poured. Specific Implementation Example 7:
[0063] This embodiment further illustrates the TC-type interlocking steel pipe pile 1 based on specific embodiment 1. The C-type interlocking structure 12 of the TC-type interlocking steel pipe pile 1 is filled with water-stopping material.
[0064] The water-stopping material is a mixture of clay, bentonite, yellow sand, and sawdust in a volume ratio of 6:1:1:1. During filling, the water-stopping material is placed in a plastic bag and inserted into the C-type interlocking structure hole of the TC-type interlocking steel pipe pile. When driving, the T-type insertion structure will tear the plastic bag, and the water-stopping material will be compacted by the excitation force of the vibratory hammer. After the pile is driven into place, the missing water-stopping material section in the C-type interlocking structure due to vibration subsidence will be manually filled and compacted with a steel rod. This structure has a good water-stopping effect. Specific Implementation Example 8:
[0066] This embodiment further describes the waler 2 based on specific embodiment 1. The waler 2 is welded to the TC type interlocking steel pipe pile 1, with a weld length of 20mm and a weld height of 10mm. Vertical reinforcing connecting plates 6 are also provided on both sides of the side of the TC type interlocking steel pipe pile 1 connected to the waler 2.
[0067] It can ensure effective support. Specific Implementation Example 9:
[0069] This embodiment further illustrates the interlocked steel pipe pile cofferdam structure based on specific embodiment 1. The outer side of the interlocked steel pipe pile cofferdam structure, which consists of TC type interlocked steel pipe piles 1, walers 2, and inner supports 3, is backfilled with outer pebbles 7, which are covered by gabion mesh. The inner side of the interlocked steel pipe pile cofferdam structure is backfilled with perforated drill cuttings 8, inner pebbles 9, and bottom sealing concrete 10 arranged sequentially from bottom to top.
[0070] Before backfilling, ensure that the backfill height of the sand inside the TC type interlocking steel pipe pile is greater than the backfill height of the interlocking steel pipe pile cofferdam structure. This will prevent local deformation of the TC type interlocking steel pipe pile due to backfilling.
[0071] Backfilling ensures that the overall stress distribution of the interlocked steel pipe pile cofferdam structure and prevents erosion of the foundation, resulting in higher stability. Specific Implementation Example 10:
[0073] This embodiment further illustrates the interlocked steel pipe pile cofferdam structure based on specific embodiment 1. The interlocked steel pipe pile cofferdam structure, which consists of TC type interlocked steel pipe piles 1, walers 2, and inner supports 3, also includes a water collection pit.
[0074] It facilitates the pumping out of water accumulated inside the cofferdam structure made of interlocking steel pipe piles.
[0075] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A water-retaining construction structure for a cofferdam made of interlocking steel pipe piles with strong resistance to water flow impact, characterized in that: The structure includes TC-type interlocking steel pipe piles (1), walers (2), and inner supports (3). The TC-type interlocking steel pipe piles (1) are arranged around the foundation. The TC-type interlocking steel pipe piles (1) have a rock penetration depth greater than 2m. The walers (2) are arranged horizontally inside the TC-type interlocking steel pipe piles (1). The walers (2) have two layers. The inner supports (3) include longitudinal inner supports (31) and diagonal braces (32). The longitudinal inner supports (31) are arranged horizontally along the longitudinal direction in the middle of the rectangular structure enclosed by the walers (2). A transverse horizontal support rod (4) is also provided between the longitudinal inner supports (31). The diagonal braces (32) are arranged at the four corners of the rectangular structure enclosed by the walers (2). A diagonal brace (32) is also provided between the outermost longitudinal inner support (31) and the waler (2) connected to it.
2. The water-retaining construction structure of the interlocking steel pipe pile cofferdam with strong resistance to water flow impact as described in claim 1, characterized in that: The TC-type interlocking steel pipe pile (1) includes straight section steel pipe piles and corner steel pipe piles. The T-type insertion structure (11) and C-type interlocking structure (12) of the straight section steel pipe pile are located on opposite sides of the steel pipe pile body (13), while the T-type insertion structure (11) and C-type interlocking structure (12) of the corner steel pipe pile are located on adjacent sides of the steel pipe pile body (13).
3. The water-retaining construction structure of the interlocking steel pipe pile cofferdam with strong resistance to water flow impact as described in claim 2, characterized in that: The C-type locking structure (12) is welded to the steel pipe pile body (13), and stiffening lining plates (5) are also welded between the two sides of the C-type locking structure (12) and the steel pipe pile body (13).
4. The water-retaining construction structure of the interlocking steel pipe pile cofferdam with strong resistance to water flow impact as described in claim 1, characterized in that: The lower part of the TC-type interlocking steel pipe pile (1) is provided with a reinforcement section. The reinforcement section extends upward from the bottom surface of the TC-type interlocking steel pipe pile (1) by 1m. The reinforcement section is covered with at least 3 or more arc-shaped steel plates inside and outside.
5. The water-retaining construction structure of the interlocking steel pipe pile cofferdam with strong resistance to water flow impact as described in claim 1, characterized in that: The TC-type lock-lock steel pipe pile (1) located on the upstream side is a reinforced pile, and the chamfer of the lock-lock steel pipe pile cofferdam structure and the inner support connection of the lock-lock steel pipe pile cofferdam structure are also reinforced piles.
6. The water-retaining construction structure of the interlocking steel pipe pile cofferdam with strong resistance to water flow impact as described in claim 5, characterized in that: The reinforced pile is a TC-type interlocked steel pipe pile in which concrete is poured into the steel pipe pile body of the TC-type interlocked steel pipe pile (1), and the pouring height of the concrete is not less than 1.5m.
7. The water-retaining construction structure of the interlocking steel pipe pile cofferdam with strong resistance to water flow impact as described in claim 1, characterized in that: The C-type lock structure (12) of the TC-type lock steel pipe pile (1) is filled with water-stopping material.
8. The water-retaining construction structure of the interlocking steel pipe pile cofferdam with strong resistance to water flow impact as described in claim 1, characterized in that: The waler (2) is welded to the TC type lock-joint steel pipe pile (1), with a weld length of 20mm and a weld height of 10mm. Vertical reinforcing connecting plates (6) are also provided on both sides of the side where the TC type lock-joint steel pipe pile (1) is connected to the waler (2).
9. The water-retaining construction structure of the interlocking steel pipe pile cofferdam with strong resistance to water flow impact as described in claim 1, characterized in that: The outer side of the interlocked steel pipe pile cofferdam structure, which consists of TC type interlocked steel pipe piles (1), walers (2) and inner supports (3), is backfilled with outer pebbles (7), which are covered by gabion mesh. The inner side of the interlocked steel pipe pile cofferdam structure is backfilled with perforated drill cuttings (8), inner pebbles (9) and bottom sealing concrete (10) arranged sequentially from bottom to top.
10. The water-retaining construction structure of the interlocking steel pipe pile cofferdam with strong resistance to water flow impact as described in claim 1, characterized in that: The locking steel pipe pile cofferdam structure, which consists of TC type lock-lock steel pipe piles (1), walers (2) and internal supports (3), also has a water collection pit.