Variable cross-section fabricated steel pipe pile

Abstract

The application discloses a variable cross-section fabricated steel pipe pile and relates to the field of bridge construction engineering, which comprises steel pipe standard sections of various specifications and variable-diameter transition sections. The steel pipe standard sections are formed by processing ordinary steel pipes with different diameters according to a module. The two ends of the steel pipe standard sections and the variable-diameter transition sections are provided with flanges to realize the connection and assembly and disassembly between the two. The steel pipe standard sections with different diameters can be connected to form a combined steel pipe pile through the variable-diameter transition sections. The application utilizes the flanges to realize the assembly erection, is convenient to assemble and disassemble, can be repeatedly used, realizes the continuous flow operation of the water pile forming, water pile connecting, water structure installation, can adapt to the pile forming construction of various terrains, landforms and geologies, realizes the whole process without cutting and welding, and eliminates the traditional water operation such as water cutting and water welding, so that the standardization, mechanization, high efficiency and zero loss are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bridge construction engineering, in particular to a variable cross-section fabricated steel pipe pile foundation of a construction trestle or temporary bridge and a water construction platform. BACKGROUND

[0002] The construction trestle or temporary bridge and water construction platform is a key preliminary project in bridge construction, which has an important influence on the overall project progress and cost. Especially under complex hydrogeological conditions, the construction of steel pipe piles in water faces many challenges, such as high difficulty, high cost, high safety risk and other problems. The traditional construction method often needs to invest a lot of resources and has low efficiency when facing complex environments such as deep water and rapids.

[0003] To cope with the above challenges, the industry usually adopts "fishing method", water ship hammering method, vibration pile driving method and other means for steel pipe pile construction. These methods mainly include hammering or vibration sinking of steel pipe piles through water platforms, and lengthening, cutting and welding operations of steel pipe piles on the water surface.

[0004] However, the existing technical means have obvious defects in actual application: first, a large amount of water operation is needed during construction, including cutting, welding and other operations, which not only has low efficiency but also has high loss; second, when facing super-long piles (pile length exceeding 50 meters or even 100 meters) and complex hydrogeological conditions, the installation and connection of steel pipe piles become extremely difficult, especially in the use of large-diameter steel pipe piles, which directly affects the progress and cost of the project. The large diameter, thick steel plate, large amount of use, high pile foundation investment and high construction difficulty are particularly prominent. Therefore, there is an urgent need for a steel pipe pile solution that can adapt to complex environments, reduce water operations and improve construction efficiency. SUMMARY

[0005] The present application provides a variable cross-section fabricated steel pipe pile, which uses flanges to realize assembly erection, intelligent installation, water pile forming, water pile connection, water structure and bridge deck installation to form continuous flow operation, and can adapt to various terrains, landforms and geological pile construction. There is no cutting and welding work throughout the process. The traditional water cutting, water welding and other water operations are eliminated, and standardized manufacturing, assembly installation, high efficiency and zero loss are achieved.

[0006] The variable cross-section fabricated steel pipe pile provided by the present application adopts the following technical scheme:

[0007] A variable cross-section fabricated steel pipe pile, comprising:

[0008] A plurality of steel pipe standard sections and variable-diameter transition sections, the steel pipe standard sections being common steel pipes of different diameters processed according to a module, both ends of the steel pipe standard sections and the variable-diameter transition sections being provided with flanges to realize connection and disassembly between them;

[0009] The steel pipe standard sections and the variable-diameter transition sections are connected through the variable-diameter transition sections to form a combined steel pipe pile, the diameter of the steel pipe pile decreases from bottom to top, the lower part of the steel pipe pile is inserted into the soil or rock mass through the steel pipe standard section with the largest diameter, the middle part of the steel pipe pile gradually shrinks in diameter through the variable-diameter transition section to reduce the water resistance area, and the upper part of the steel pipe pile is matched with the upper bridge deck beam through the steel pipe standard section with the smallest diameter.

[0010] The diameters of the steel pipe standard sections and the variable-diameter transition sections are 500mm-3000mm, when the diameters of the steel pipe standard sections and the variable-diameter transition sections are less than 1000mm, the flanges of the steel pipe standard sections and the variable-diameter transition sections are provided as external flanges, when the diameters of the steel pipe standard sections and the variable-diameter transition sections are more than 1000mm, the flanges of the steel pipe standard sections and the variable-diameter transition sections are provided as internal flanges, and the internal flanges can increase the frictional resistance around the pile after subsequent grouting in the steel pipe pile.

[0011] By using the above technical solution, the common steel pipes are processed into standard sections according to a module and matched with variable-diameter transition sections, and the two ends are connected and disassembled through flanges, so that a combined steel pipe pile can be formed; the steel pipe pile has a large diameter at the lower part and a small diameter at the upper part, the lower part is inserted into the soil or rock mass through the large-diameter standard section to ensure stability, the middle part shrinks in diameter through the variable-diameter transition section to reduce the water resistance area, and the upper part is matched with the bridge deck beam through the small-diameter standard section to facilitate connection with the upper structure; the diameters of the steel pipe standard sections and the variable-diameter transition sections are limited to 500mm-3000mm, which can meet the application scenarios of different hydrogeology, design pile length and different stress requirements; the flanges with a diameter less than 1000mm are provided as external flanges, and the flanges with a diameter more than 1000mm are provided as internal flanges, which can optimize the structural design; after subsequent grouting in the steel pipe pile, the internal flanges can increase the frictional resistance around the pile to improve the stability and bearing capacity of the steel pipe pile.

[0012] Optionally, the steel pipe pile is sunk through a hole drilling method combined with a hydraulic device, and the steel pipe standard sections and the variable-diameter transition sections can be connected with the pile pressing end of the hydraulic device through the flanges.

[0013] By adopting the technical scheme, the flange can not only connect the steel pipe standard section and the variable-diameter transition section, but also connect the pile end of the hydraulic device, thereby greatly improving the construction efficiency. As a result, the assembly erection and intelligent installation are realized, the continuous flow operation of the water pile, pile connection and upper structure installation is formed, the pile construction of various terrains, landforms and geology is adapted, the problems caused by the traditional water operation mode are avoided, and the standardization, mechanization, high efficiency and zero loss are achieved.

[0014] Optionally, the wall thickness of the steel pipe pile is 10-60 mm, the length of the steel pipe standard section is 2.5 m or 3-6 m, the length of the steel pipe standard section at the lowermost part of the steel pipe pile is 6-12 m, the upper end of the steel pipe standard section at the lowermost part is provided with a flange, and the lower end is not provided with a flange.

[0015] By adopting the technical scheme, the reasonable wall thickness of the steel pipe pile is specified to ensure that the steel pipe pile has appropriate strength and stability, the appropriate length of the steel pipe standard section is set to facilitate production, transportation and installation, and the length of the steel pipe standard section at the lowermost part is determined and the upper end thereof is provided with a flange and the lower end is not provided with a flange, which is beneficial to the insertion of the steel pipe pile into the soil or rock body and facilitates the pile sinking construction.

[0016] Optionally, the inner flange is provided with a reinforcing rib extending along the axial direction of the inner flange and not exceeding the inner radial wall, and the reinforcing rib is fixedly connected with the inner wall of the steel pipe standard section or the variable-diameter transition section.

[0017] By adopting the technical scheme, the reinforcing rib extending along the axial direction and not exceeding the inner radial wall and being fixedly connected with the inner wall is arranged on the inner flange, so that the strength and stability of the inner flange are enhanced and the overall reliability of the steel pipe pile structure is improved.

[0018] Optionally, the steel pipe standard sections or the variable-diameter transition sections can be connected and disassembled through the flanges.

[0019] By adopting the technical scheme, the steel pipe standard sections and the steel pipe standard sections or the variable-diameter transition sections and the variable-diameter transition sections can be connected and disassembled through the flanges, so that the steel pipe pile can be flexibly assembled and disassembled, the adjustment during the construction process and the recycling in the later period are facilitated, and the construction flexibility and material utilization rate are improved.

[0020] Optionally, a shock-absorbing support is installed above the steel pipe standard section at the top of the combined steel pipe pile, a bridge deck plate stringer is installed on the shock-absorbing support, and a bridge deck plate is installed on the bridge deck plate stringer.

[0021] By adopting the technical scheme, the shock-absorbing support is installed above the steel pipe standard section at the top of the combined steel pipe pile, the bridge deck beam is installed on the shock-absorbing support, and the bridge deck is installed on the bridge deck beam, so that the shock-absorbing effect can be achieved, the installation of the bridge deck beam and the bridge deck is more stable, and the stability and safety of the whole structure are improved.

[0022] Optionally, the steel pipe standard section is connected with the shock-absorbing support through a flange.

[0023] By adopting the technical scheme, the flange is used as a unified standard connecting piece between the components, so that the cost can be effectively reduced, the disassembly and assembly convenience can be improved, the bridge deck beam and the bridge deck can be more stably installed on the combined steel pipe pile, and the shock-absorbing support can be conveniently disassembled, replaced and maintained.

[0024] Optionally, the fabricated steel pipe pile is formed by the following method:

[0025] S1, according to different hydrogeological conditions, design pile lengths and different stress requirements, a corresponding steel pipe standard section and a variable-diameter transition section are designed;

[0026] S2, the steel pipe standard section and the variable-diameter transition section are connected in sequence through the flange, and a combined steel pipe pile is formed by combining hydraulic pile sinking in sequence through a lead hole method;

[0027] S3, a top section blind plate is connected through the flange of the steel pipe standard section at the top;

[0028] S4, a shock-absorbing support is placed on the top section blind plate;

[0029] S5, a bridge deck beam is installed on the shock-absorbing support;

[0030] S6, a bridge deck is installed on the bridge deck beam.

[0031] By adopting the technical scheme, appropriate components can be designed according to different hydrogeological conditions, design pile lengths and stress requirements, the components are connected through the flange, and a combined steel pipe pile is formed by combining hydraulic pile sinking through a lead hole method, and then a top section blind plate, a shock-absorbing support, a bridge deck beam and a bridge deck are installed, so that flexible design and efficient assembly construction of the variable cross-section fabricated steel pipe pile are realized, different working conditions are adapted, and bridge deck paving is completed; meanwhile, the process can eliminate traditional water cutting, welding and assembly, and achieve standardization, mechanization, high efficiency and zero loss.

[0032] Optionally, when the combined steel pipe pile needs to be removed subsequently, the steel pipe standard section and the variable-diameter transition section can be separated by removing the flange.

[0033] By adopting the technical scheme, when the combined steel pipe pile needs to be removed subsequently, the steel pipe standard section and the variable-diameter transition section can be separated by removing the flange, the steel pipe pile is convenient to disassemble, material recycling is facilitated, material utilization is improved, and the difficulty and cost of later maintenance and adjustment are reduced.

[0034] To sum up, the present application includes at least one of the following beneficial technical effects:

[0035] 1. The ordinary steel pipe is processed into a standard section and a transition section with a flange and connected into a combined steel pipe pile, realizing assembly erection and intelligent installation, forming continuous flow operation, being able to adapt to pile construction of various terrains, landforms and geology, having no cutting and welding work throughout the process, improving construction efficiency and realizing standardization, mechanization and zero loss;

[0036] 2. The combined steel pipe pile gradually shrinks in diameter through the variable-diameter transition section in the middle, reduces the water-blocking area, and the lower large-diameter pile is inserted into the soil or rock mass, improving the bearing capacity and structural stability of the pile, wind and wave resistance, and facilitating the installation of the upper structure;

[0037] 3. The inner flange is arranged on the diameter of 1000mm or more, and the frictional resistance around the pile can be increased after subsequent grouting of the steel pipe pile. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is a schematic view of the variable cross-section assembly type steel pipe pile of embodiment 1 of the present application.

[0039] Figure 2 is a structural schematic view of the top section steel pipe pile of the present application.

[0040] Figure 3 is a structural schematic view of the variable-diameter transition section of the present application.

[0041] Figure 4 is a structural schematic view of the bottom section steel pipe pile of the present application.

[0042] Figure 5 is an elevation view of the variable cross-section assembly type steel pipe pile of embodiment 2 of the present application.

[0043] Figure 6 is a side view of the variable cross-section assembly type steel pipe pile of embodiment 2 of the present application.

[0044] Figure 7 is a formation schematic view of the variable cross-section assembly type steel pipe pile of embodiment 2 of the present application.

[0045] BRIEF DESCRIPTION OF DRAWINGS

[0046] 1, steel pipe standard section; 11, top section steel pipe pile; 12, intermediate section steel pipe pile; 13, bottom section steel pipe pile; 2, variable diameter transition section; 21, top section variable diameter transition section; 22, intermediate variable diameter transition section; 3, flange; 31, outer flange; 32, inner flange; 33, reinforcing rib; 4, top section blind plate; 5, shock absorbing support; 6, bridge deck plate stringer; 7, bridge deck plate. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be further described below with reference to the accompanying drawings. Figures 1-7 The technical solutions in the embodiments of the present application will be further described below with reference to the accompanying drawings.

[0048] In the related art, a patent with publication number CN 102628270 A discloses a large-diameter variable cross-section special-shaped resistance-increasing steel pipe pile system, which comprises an offshore work platform, the offshore work platform is provided with a hoisting device and a high-pressure pump, the high-pressure pump is connected with a plurality of high-pressure injection pipes on the inner wall of the steel pipe pile, the top end of the steel pipe pile is provided with a pile cap, the upper part of the pile cap is provided with a vibration hammer connected with the hoisting device; a mud pump support is arranged in the steel pipe pile, a slurry discharge pipe is supported on the mud pump support, the lower part of the slurry discharge pipe is connected with a mud pump, and the upper part of the slurry discharge pipe is communicated with a slurry discharge port on the side surface of the steel pipe pile. The present application also discloses a construction method of the system. The present application is suitable for various foundation engineering with special technical requirements such as pile foundation compression resistance, uplift resistance, bending resistance, etc., has the characteristics of fast construction, low cost, easy control of construction quality, etc., and is particularly suitable for offshore engineering large monomer structures such as bridge piers and offshore wind turbines.

[0049] The main point is to set a large-diameter variable cross-section special-shaped resistance-increasing steel pipe pile at the bottom of the steel pipe pile, and combine the water flow injection technology and the cement soil filling technology to improve the uplift resistance, compression resistance and horizontal bearing capacity of the pile. However, a large amount of water operation is still required in the construction process, including cutting, welding and other operations, which not only has low efficiency and large loss, but also is extremely inconvenient for subsequent removal; at the same time, the steel pipe pile has large diameter, thick steel plate, large amount of use, high pile foundation investment and large construction difficulty, which seriously affects the progress and cost of the project.

[0050] The present application mainly adopts detachable steel pipe piles assembled by different diameter standard sections and transition sections, which achieves the effects of less operation amount, convenient and efficient assembly and disassembly, and adaptation to different working conditions. The present application will be further described in detail as follows.

[0051] In embodiment 1, the variable cross-section assembled steel pipe pile provided by the present application is described with reference to Figure 1The steel pipe standard section 1 and the variable-diameter transition section 2 are connected together through the variable-diameter transition section 2, the combination connection of standard sections with different diameters is realized, the steel pipe pile is flexibly assembled according to different hydrogeological conditions and stress requirements, the bottom section has large bearing capacity, the structure is stable, the wind and wave resistance is good, the top section is convenient for the installation of the steel beam structure and the bridge deck structure, and the effect of saving cost is achieved. This is because the standard sections with different diameters can be combined as needed, the large-diameter section at the bottom ensures the bearing and stability, and the small-diameter section at the top adapts to the upper structure.

[0052] Specifically, the steel pipe standard section 1 can be divided into a top section steel pipe pile 11, a middle section steel pipe pile 12 and a bottom section steel pipe pile 13, and the diameters thereof decrease from top to bottom. The steel pipe standard section 1 is processed by ordinary steel pipes with different diameters according to a module. The ordinary steel pipes are generally made of high-strength steel materials, which have good toughness and strength and can bear large pressure and external force. For example, the common Q345 steel material can be selected, and other steel materials with better performance can also be selected according to actual engineering requirements. For the steel pipe standard sections 1 with different diameters, accurate processing is performed according to the design module to ensure the accuracy and stability of subsequent assembly.

[0053] The steel pipe standard section 1 is provided with a flange 3 at both ends, which can tightly connect the steel pipe standard section 1 with other components. The material of the flange 3 is generally consistent with that of the steel pipe standard section 1 to ensure the performance matching of the two. During production, a forging process is adopted to make the flange 3 have high strength and accuracy.

[0054] Referring to Figure 1 and Figure 2 For the steel pipe standard section 1 with a diameter of less than 1000 mm, the flange 3 is provided as an outer flange 31 which protrudes from the surface of the steel pipe, so that it is convenient to operate and position during connection. When the diameter of the steel pipe standard section 1 is greater than or equal to 1000 mm, the flange 3 is provided as an inner flange 32 which is located inside the steel pipe. The construction personnel can enter the inside of the steel pipe to connect the flange 3. After the connection is completed, grouting is performed in the steel pipe pile. The inner flange 32 can increase the frictional resistance around the pile and improve the stability and bearing capacity of the steel pipe pile.

[0055] In a preferred embodiment, the inner flange 32 is further provided with a reinforcing rib 33 which extends axially along the inner flange 32 and does not exceed the inner side wall of the inner flange 32 in the radial direction. The reinforcing rib 33 is fixedly connected to the inner wall of the steel pipe standard section 1 by welding. The provision of the reinforcing rib 33 greatly enhances the structural strength of the inner flange 32, so that it can better withstand forces from all directions. In this embodiment, the flange 3 is circular in shape. In other embodiments, the flange 3 can also be oval, polygonal or the like.

[0056] The variable-diameter transition section 2 can be divided into a top variable-diameter transition section 21 and a middle variable-diameter transition section 22, and the diameters thereof decrease from top to bottom. The main function of the variable-diameter transition section 2 is to connect steel pipe standard sections 1 of different diameters, so that the diameter of the entire steel pipe pile can gradually decrease from bottom to top. The variable-diameter transition section 2 is also made of appropriate steel materials, and the flanges 3 at both ends thereof are matched with the flanges 3 of the connected steel pipe standard sections 1 in specification, so as to realize reliable connection.

[0057] With reference to Figure 1 and Figure 3 When the diameter of the variable-diameter transition section 2 is less than or equal to 1000 mm, the outer flange 31 is used; when the diameter is greater than 1000 mm, the inner flange 32 is used, and the flanges 3 of the variable-diameter transition section 2 and the steel pipe standard section 1 are arranged in the same manner. In a preferred embodiment, the variable-diameter transition section 2 is in the shape of a tapered cone, and the smooth transition of the tapered structure thereof makes the force transmission more uniform. This structure avoids stress concentration caused by sudden change in diameter, improves the overall stability of the steel pipe pile, and effectively reduces the impact of external forces such as water flow on the steel pipe pile.

[0058] In other embodiments, the variable-diameter transition section 2 can also be in the form of a stepped transition section. The stepped transition section is composed of a plurality of short pipes of different diameters connected in sequence, and the flanges 3 of both ends of each short pipe are matched with the standard section or other short pipes. This design can also realize the connection of standard sections of different diameters, and has advantages in some projects with special requirements for space layout.

[0059] In assembly, appropriate steel pipe standard sections 1 and variable-diameter transition sections 2 are selected according to different hydrogeological conditions and design pile lengths, and different force requirements. Then, they are connected in sequence through the flanges 3, such as connecting a steel pipe standard section 1 of a larger diameter and a steel pipe standard section 1 of a smaller diameter with the variable-diameter transition section 2, to form a structure with gradually decreasing diameter. The steel pipe pile formed by such combination has a decreasing diameter from bottom to top. The lower part is inserted into the soil or rock mass through the steel pipe standard section 1 of the largest diameter, which can provide greater bearing capacity and ensure the stability of the steel pipe pile. The middle part gradually shrinks in diameter through the variable-diameter transition section 2, effectively reducing the water-blocking area and the impact force of water flow on the steel pipe pile. The upper part is matched with the upper bridge deck beam 6 through the steel pipe standard section 1 of the smallest diameter, which reduces the cost and facilitates the installation of the subsequent bridge deck beam 6.

[0060] Specifically, the steel pipe standard section 1 and the variable-diameter transition section 2 also have certain size specifications. The diameters of the steel pipe standard section 1 and the variable-diameter transition section 2 are 500mm-3000mm, which can meet the needs of most projects. The wall thickness of the steel pipe pile is 10-60mm, and different wall thicknesses can be adjusted according to different stress conditions to ensure the strength and stability of the steel pipe pile. The length of the steel pipe standard section 1 is generally 2.5m or 3-6m, which facilitates transportation and construction.

[0061] Referring to Figure 4 The length of the lowermost steel pipe standard section 1 of the steel pipe pile is 6-12m, and a flange 3 is provided at the upper end for connection with other components, and no flange 3 is provided at the lower end, which facilitates entry into the soil or rock and reduces the resistance to pile sinking.

[0062] In addition, the steel pipe standard section 1 and the steel pipe standard section 1, or the variable-diameter transition section 2 and the variable-diameter transition section 2, can be connected and disassembled through the flange 3. This scheme can further flexibly assemble and disassemble the steel pipe pile, facilitate on-demand adjustment during construction and recycling for later use, and improve construction flexibility and material utilization.

[0063] The implementation principle of the present embodiment 1 is that this variable cross-section fabricated steel pipe pile is modularly designed and assembled by different diameter steel pipe standard sections 1 and variable-diameter transition sections 2, which fully utilizes the advantages of different diameter components. The lower large-diameter steel pipe standard section 1 provides strong bearing capacity to ensure the stability of the steel pipe pile under complex geological conditions; the variable-diameter transition section 2 in the middle reduces the water-blocking area and improves the adaptability of the steel pipe pile in the water flow environment; the upper small-diameter steel pipe standard section 1 facilitates matching with the upper structure. Moreover, the fabricated connection mode realized through the flange 3 makes the construction process more convenient and efficient, greatly shortens the construction period, reduces the construction cost, and improves the material recycling rate, which is a significant improvement and upgrade compared with the traditional steel pipe pile construction method.

[0064] In embodiment 2, the difference from embodiment 1 is that the steel pipe pile is sunk by the hole drilling method combined with a hydraulic device, and the steel pipe standard section 1 and the variable-diameter transition section 2 can be connected with the pile pressing end of the hydraulic device through the flange 3.

[0065] When the hole is being drilled, professional drilling equipment such as a spiral drill machine is used. According to the design requirements, a hole with the appropriate diameter and depth is drilled at the specified location. During the drilling process, the verticality of the hole and the accuracy of the hole diameter must be ensured to ensure the smooth insertion of the subsequent steel pipe pile. The hydraulic device is the key equipment for pile driving, which can provide strong and stable pressure to accurately press the steel pipe pile into the hole. The hydraulic device is generally composed of a hydraulic pump, a hydraulic cylinder and other components, which drives the piston of the hydraulic cylinder to move through the pressure of hydraulic oil, thereby realizing the function of pile driving.

[0066] When connected, the flanges 3 of the steel pipe standard section 1 and the variable-diameter transition section 2 are tightly connected together with the pile driving end of the hydraulic device through connecting components such as bolts. This connection mode ensures that during pile driving, force can be uniformly transmitted to the steel pipe pile, avoiding the situation that local force is too large and causing damage to the steel pipe pile. Through the hole drilling combined with the pile driving of the hydraulic device, the depth and verticality of the steel pipe pile into the soil can be more accurately controlled, improving the quality and efficiency of pile driving, especially suitable for projects with high requirements for pile position accuracy.

[0067] The implementation principle of the embodiment is that the hole drilling method is combined with the pile driving of the hydraulic device to overcome the limitations of traditional pile driving methods under certain complex geological conditions. Hole drilling can create good soil conditions for the steel pipe pile in advance, reducing resistance during pile driving; the stable pressure provided by the hydraulic device can ensure that the steel pipe pile is accurately and smoothly driven into the specified position. At the same time, through the connection of the flanges 3 and the hydraulic device, the effective transmission of force and the safety of construction are guaranteed, compared with the traditional pile driving method, the construction quality and efficiency are improved, and the construction difficulty and cost are reduced.

[0068] In embodiment 3, the difference from embodiment 1 is that Figure 5 and Figure 6 A top section blind plate 4 is installed above the steel pipe standard section 1 at the top of the combined steel pipe pile, a shock-absorbing support 5 is placed on the top section blind plate 4, a bridge deck plate stringer 6 is installed on the shock-absorbing support 5, and a bridge deck plate 7 is installed on the bridge deck plate stringer 6.

[0069] The top section blind plate 4 is used to support the upper structure assembly, and the shock-absorbing support 5 is a device with special performance, which is generally made of elastic materials such as rubber. Rubber has good elasticity and energy absorption performance, which can effectively absorb and buffer the vibration and impact force from the bridge deck plate 7 and the outside world. The shape of the shock-absorbing support 5 is usually circular or square, and its size is designed according to the specifications of the bridge deck plate stringer 6 and the steel pipe standard section 1.

[0070] In a preferred embodiment, the shock-absorbing support 5 is tightly connected with the flange 3 at the top of the steel pipe standard section 1 through connecting components such as bolts, and is also firmly connected with the bridge deck plate stringer 6.

[0071] The bridge deck longitudinal beam 6 is an important structural component that supports the bridge deck 7, which is usually made of steel beams or reinforced concrete beams. Steel beams have the advantages of high strength, light weight, and can withstand large loads; reinforced concrete beams have good durability and stability. The bridge deck longitudinal beam 6 is installed on the shock-absorbing support 5 and connected to it through a specific connection method, such as welding or bolting, to ensure reliable connection between them.

[0072] The bridge deck 7 is installed on the bridge deck longitudinal beam 6 and is the part directly used for vehicle and pedestrian traffic. The bridge deck 7 is generally made of reinforced concrete or steel plate, which has sufficient strength and flatness. During installation, the bridge deck 7 is fixed on the bridge deck longitudinal beam 6 through a certain fixing method, such as bolting or welding, to form a complete bridge deck structure.

[0073] The implementation principle of this embodiment 3 is to install the shock-absorbing support 5 on the top of the combined steel pipe pile, which can effectively reduce the impact of vibration and impact force generated during the use of the bridge on the steel pipe pile and the lower structure, prolonging the service life of the bridge. The reasonable installation of the bridge deck longitudinal beam 6 and the bridge deck 7 forms a complete bridge deck structure, providing a safe and smooth traffic condition for vehicles and pedestrians. This structural design not only improves the comfort and safety of the bridge, but also enhances the stability and reliability of the entire bridge structure.

[0074] In this embodiment 4, the forming method of the variable cross-section fabricated steel pipe pile is provided, which is described with reference to Figure 7 , including the following steps:

[0075] S1, according to different hydrogeological conditions and design pile length, different stress requirements, design corresponding steel pipe standard section 1 and variable diameter transition section 2.

[0076] Specifically, first, the hydrogeological conditions of the construction site need to be investigated and analyzed in detail to understand the properties of the soil layer, underground water level and other information. At the same time, according to the design requirements of the bridge, the required pile length and bearing capacity are determined. Then, according to these data, the steel pipe standard section 1 and variable diameter transition section 2 with appropriate diameter, length and wall thickness are designed. The connection and matching relationship between different components should be fully considered during the design process to ensure the smooth assembly of the subsequent components.

[0077] S2, connect the steel pipe standard section 1 and the variable diameter transition section 2 through the flange 3 in sequence, and form the combined steel pipe pile by combining the hydraulic pile sinking method in sequence.

[0078] Specifically, in the connection, the sealing and fastening between the flanges 3 are guaranteed, and the connection is usually carried out by using sealing gaskets and high-strength bolts. The hole drilling operation is carried out according to the design requirements, so as to ensure that the diameter and depth of the hole meet the standards. When the hydraulic pile sinking is carried out, the speed and force of the pile sinking are controlled, so as to avoid damaging the steel pipe pile. With the connection and sinking of the steel pipe standard section 1 and the variable-diameter transition section 2, the complete combined steel pipe pile is gradually formed.

[0079] S3, connecting the top section blind plate 4 through the flange 3 of the top steel pipe standard section 1.

[0080] Specifically, the steel pipe standard section 1 is sealed through the top section blind plate 4, and the top section blind plate 4 is used to support the upper structure, which can better adapt to the installation requirements of the upper structure of the trestle or the working platform, realize the reasonable connection of the assembled steel pipe pile and the upper structure, and be beneficial to the construction of the entire water trestle or water working platform.

[0081] S4, placing the shock-absorbing support 5 on the top section blind plate 4.

[0082] Specifically, before installing the shock-absorbing support 5, the surface of the top section blind plate 4 is cleaned and smoothed, so as to ensure that the shock-absorbing support 5 can be stably installed. Then, the shock-absorbing support 5 is firmly connected with the top section blind plate 4 through bolts and other connecting members.

[0083] S5, installing the bridge deck plate stringer 6 on the shock-absorbing support 5.

[0084] Specifically, during the installation, the position of the bridge deck plate stringer 6 is ensured to be accurate, and the connection between the bridge deck plate stringer 6 and the shock-absorbing support 5 is firm. Specific positioning devices are usually used to ensure the installation accuracy of the bridge deck plate stringer 6.

[0085] S6, installing the bridge deck plate 7 on the bridge deck plate stringer 6.

[0086] Specifically, during the installation of the bridge deck plate 7, attention should be paid to the splicing and fixing between the plates, so as to ensure the flatness and integrity of the bridge deck. The bridge deck plate 7 can be fixed on the bridge deck plate stringer 6 by welding, bolt connection and the like.

[0087] In addition, when the combined steel pipe pile needs to be removed subsequently, the steel pipe standard section 1 and the variable-diameter transition section 2 can be separated by removing the flange 3, or the steel pipe standard section 1 and the steel pipe standard section 1, and the variable-diameter transition section 2 and the variable-diameter transition section 2 can be separated.

[0088] The implementation principle of the embodiment is that the forming method is constructed in a reasonable order from the beginning of the design, ensuring the applicability and matching of each component. Through the combination of hole drilling and hydraulic pile sinking, the precision and efficiency of pile sinking are improved. During the installation of the shock-absorbing support 5, the bridge deck panel longitudinal beam 6 and the bridge deck panel 7, the installation quality is strictly controlled to ensure the stability and safety of the entire bridge structure. Compared with the traditional construction method, this forming method is more scientific and efficient, can adapt to different engineering needs, and reduces the uncertainty and risk in the construction process.

[0089] The above are preferred embodiments of the present application, but do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A variable cross-section fabricated steel pipe pile, characterized by, The steel pipe pile is used for construction of trestle or temporary bridge and water construction platform, and comprises: a plurality of steel pipe standard sections (1) and variable-diameter transition sections (2), the steel pipe standard sections (1) are ordinary steel pipes with different diameters and are processed according to a module, and the steel pipe standard sections (1) and the variable-diameter transition sections (2) are provided with flanges (3) at two ends to realize connection and assembly and disassembly between them; wherein the steel pipe standard sections (1) with different diameters are connected to form a combined steel pipe pile through the variable-diameter transition sections (2), the diameter of the steel pipe pile presents a decreasing trend from bottom to top, the lower part of the steel pipe pile is inserted into soil or rock through the steel pipe standard section (1) with the largest diameter, the middle part of the steel pipe pile is gradually contracted in diameter through the variable-diameter transition sections (2) to reduce water resistance area, and the upper part of the steel pipe pile is matched with upper deck plate stringers (6) through the steel pipe standard section (1) with the smallest diameter. The diameter of the steel pipe standard section (1) and the variable-diameter transition section (2) is 500mm-3000mm, when the diameter of the steel pipe standard section (1) and the variable-diameter transition section (2) is below 1000mm, the flange (3) of the steel pipe standard section (1) and the variable-diameter transition section (2) is provided as an outer flange (31), when the diameter of the steel pipe standard section (1) and the variable-diameter transition section (2) is above 1000mm, the flange (3) of the steel pipe standard section (1) and the variable-diameter transition section (2) is provided as an inner flange (32), and the inner flange (32) can increase the frictional resistance around the pile after subsequent grouting of the steel pipe pile; The wall thickness of the steel pipe pile is 10-60mm, the length of the steel pipe standard section (1) is 2.5m or 3-6m, the length of the steel pipe standard section (1) at the lowermost part of the steel pipe pile is 6-12m, the upper end of the lowermost steel pipe standard section (1) is provided with a flange (3), and the lower end is not provided with a flange (3). The steel pipe pile is sunk through a pilot hole method combined with a hydraulic device, and the steel pipe standard section (1) and the variable-diameter transition section (2) are connected with the pile pressing end of the hydraulic device through the flange (3).

2. The variable cross-section fabricated steel pipe pile according to claim 1, characterized in that: The inner flange (32) is provided with a reinforcing rib (33) extending in the axial direction of the inner flange (32), and the reinforcing rib (33) does not extend beyond the inner side wall of the inner flange (32) in the radial direction, and the reinforcing rib (33) is fixedly connected with the inner wall of the steel pipe standard section (1) or the variable-diameter transition section (2).

3. The variable cross-section fabricated steel pipe pile according to claim 1, characterized in that: The steel pipe standard section (1) and the steel pipe standard section (1), or the variable-diameter transition section (2) and the variable-diameter transition section (2), can be connected and assembled and disassembled through the flange (3).

4. The variable cross-section fabricated steel pipe pile according to claim 1, characterized in that, A shock-absorbing support (5) is installed above the steel pipe standard section (1) at the top of the combined steel pipe pile, a deck plate stringer (6) is installed on the shock-absorbing support (5), and a deck plate (7) is installed on the deck plate stringer (6).

5. The variable cross-section fabricated steel pipe pile according to claim 4, characterized in that, The steel pipe standard section (1) is connected with the shock-absorbing support (5) through the flange (3).

6. The variable cross-section fabricated steel pipe pile according to claim 1, wherein The fabricated steel pipe pile is formed by the following method: S1, according to different hydrogeology and design pile length, different stress requirements, design corresponding steel pipe standard section (1) and variable diameter transition section (2); S2, through the flange (3) in turn steel pipe standard section (1) and variable diameter transition section (2) are connected, and in turn through the hole method combined with hydraulic pile sinking, form combined steel pipe pile; S3, through the flange (3) of the top steel pipe standard section (1) connects the top section blind plate (4); S4, on the top section blind plate (4) places the shock absorbing support (5); S5, on the shock absorbing support (5) installs the bridge deck plate stringer (6); S6, on the bridge deck plate stringer (6) installs the bridge deck plate (7).

7. The variable cross-section fabricated steel pipe pile according to claim 6, characterized in that, When the combined steel pipe pile needs to be removed subsequently, the separation of the steel pipe standard section (1) and the variable diameter transition section (2) is realized by removing the flange (3).

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