Temporary steel trestle and cast-in-place pile construction platform integrated structure and construction method

Abstract

The application discloses a temporary steel trestle and cast-in-place pile construction platform integrated structure, which comprises a temporary steel trestle arranged along the coastline and a cast-in-place pile construction platform laid on the temporary steel trestle. The temporary steel trestle comprises a near-shore section structure and a far-shore section structure, and a transition pier is arranged between the near-shore section structure and the far-shore section structure. The near-shore section structure and the far-shore section structure on the transition pier are connected through pile top cross beams. The temporary steel trestle and the cast-in-place pile construction platform integrated structure adopt a section steel girder to adapt to heavy load working conditions for the near-shore section structure, and adopt a Bailey beam to realize large-span crossing for the far-shore section structure. The two structure forms are smoothly connected through the transition pier, and the economic efficiency of the near-shore bearing capacity and the far-shore crossing is considered, so that the problems of large steel consumption of a single structure form and insufficient near-shore safety reserve are solved.

Description

Technical Field

[0001] This invention relates to an integrated structure and construction method for a temporary steel trestle bridge and a cast-in-place pile construction platform. Background Technology

[0002] During the construction phase of large-scale coastal liquid chemical berth projects, temporary access roads need to be erected between the wharf shoreline and the land area to transport construction materials, personnel, equipment, and superstructure components; simultaneously, a pile foundation construction platform needs to be installed near the shore. Existing temporary offshore structures typically have the following shortcomings: Firstly, temporary steel trestle bridges mostly adopt a single structural form. The near-shore section has a large load due to the connection with the shore, widening, and concentrated operation of large machinery, while the far-shore section needs to cross deep water soft soil over a long distance. The single structural form cannot simultaneously take into account the near-shore bearing capacity and the economy of crossing the far shore, resulting in a large amount of steel consumption and insufficient safety reserves in the near-shore section.

[0003] Secondly, the temporary steel trestle bridge and the cast-in-place pile construction platform were erected independently, resulting in a large amount of temporary work and a long period of occupation of the sea area. Furthermore, the separate arrangement of the two was not conducive to the compactness and coordination of the construction organization.

[0004] Therefore, in response to the above problems, an integrated structure and construction method for temporary steel trestle bridge and cast-in-place pile construction platform are proposed. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing structures by providing an integrated structure and construction method for temporary steel trestle bridges and cast-in-place pile construction platforms, thereby solving the problems of large steel consumption and insufficient near-shore safety reserves in single-structure forms.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an integrated structure of a temporary steel trestle bridge and a cast-in-place pile construction platform, comprising: A temporary steel trestle bridge is arranged along the shoreline, and a pile foundation construction platform is laid on the temporary steel trestle bridge; The temporary steel trestle bridge includes a near-shore section structure and a far-shore section structure. A transition pier is set between the near-shore section structure and the far-shore section structure. The near-shore section structure and the far-shore section structure located on both sides are connected by a pile top beam on the transition pier. The cast-in-place pile construction platform includes a bridge deck, which is laid on the near-shore section structure and the far-shore section structure; the bridge deck has reserved pile holes corresponding one-to-one with the pile positions of the cast-in-place piles, and each reserved pile hole is covered with a removable pile hole cover plate.

[0007] Preferably, the nearshore section structure includes: Multiple first steel pipe piles are arranged in pairs, and the pairs of steel pipe piles are arranged in rows at intervals along the longitudinal direction; the upper end of the first steel pipe piles is connected to the steel main beam, and the upper end of the steel main beam is connected to the bridge deck.

[0008] Preferably, the offshore section structure includes: Multiple second steel pipe piles are installed in pairs, and the pairs of steel pipe piles are arranged in rows at intervals along the longitudinal direction; the upper end of the second steel pipe piles is connected to the Bailey beam, and the upper end of the Bailey beam is connected to the bridge deck.

[0009] Preferably, the bridge deck is composed of a steel frame and patterned steel plates welded thereon.

[0010] Preferably, horizontally connected and cross-arranged scissor bracing is provided between the multiple first steel pipe piles.

[0011] Preferably, the upper sidewalls of the multiple first steel pipe piles and the multiple second steel pipe piles are provided with stiffening ribs for reinforcing the top bridge deck.

[0012] Preferably, steel guardrails are provided on both sides of the bridge deck, and kick plates are provided on the lower side of the steel guardrails.

[0013] Preferably, it also includes multiple sets of structural health monitoring components; the multiple sets of structural health monitoring components are respectively arranged on the temporary steel trestle bridge and the cast-in-place pile construction platform, and are communicatively connected to the data acquisition and display terminal.

[0014] A construction method for the integrated structure of the temporary steel trestle bridge and the cast-in-place pile construction platform includes the following steps: S1. Conduct engineering geological surveys along the longitudinal zones of the bridge site. Based on the stratum distribution and bearing capacity index revealed by each survey borehole, and combined with the calculation results of the vertical ultimate bearing capacity of a single pile, determine the differentiated pile lengths of the first and second steel pipe piles in each zone, so that the bearing capacity of a single pile is not less than the design value of the pile top reaction force, and compile a pile driving operation schedule accordingly. S2. Drive the first and second steel pipe piles to the design elevation according to the pile driving operation schedule; complete the pile head treatment; weld stiffening ribs to the upper end of the first and second steel pipe piles; install scissor bracing between multiple first steel pipe piles. S3. Install the transition pier and the pile top beam; hoist the steel main beam of the near-shore section structure into place, assemble the Bailey beam of the far-shore section structure, and complete the transition connection between the near-shore section structure and the far-shore section structure at the transition pier through the pile top beam. S4. Modularly lay bridge deck panels, and simultaneously install steel guardrails and kick plates; open reserved pile holes at the corresponding pile positions on the cast-in-place pile construction platform, and assemble detachable pile hole covers; pour concrete into the corresponding cast-in-place pile positions through the reserved pile holes. S5. Install multiple sets of structural health monitoring components at the mid-span of the load-bearing beam, the support section, the pile top, and the maximum stress zone of the Bailey beam, and connect them to the data acquisition and display terminal; mark traffic zone markings and install load limit and speed limit signs on the bridge deck to complete the zonal control of dynamic load on the bridge deck; S6. During construction, structural response data will be collected in real time through structural health monitoring components. Based on the monitoring data, the layout of construction vehicles and the requirements for load and speed limits will be dynamically adjusted. Static load tests will be carried out on key piers in conjunction with the monitoring data. After the permanent structure of the waterway project is completed, the bridge deck and the superstructure will be completely dismantled and transferred for reuse in subsequent projects.

[0015] Compared with the prior art, the beneficial effects of this invention are as follows: The temporary steel trestle bridge and the cast-in-place pile construction platform are integrated into one structure. The near-shore section uses steel main beams to adapt to heavy-load conditions, while the offshore section uses Bailey beams to achieve large-span crossing. The two structural forms are smoothly connected by transition piers, taking into account both the near-shore bearing capacity and the economy of offshore crossing, and solving the problems of large steel consumption and insufficient near-shore safety reserves of a single structural form. By integrating the temporary steel trestle bridge and the cast-in-place pile construction platform into one, the removable pile hole cover plates can be used to switch between passage and construction conditions, eliminating the need to set up two separate temporary facilities, reducing the amount of temporary engineering, shortening the time of occupation of the sea area, and facilitating the coordination of on-site construction organization. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a plan view of the integrated structure of the temporary steel trestle bridge and the cast-in-place pile construction platform of the present invention; Figure 2 This is a side view of the integrated structure of the temporary steel trestle bridge and the cast-in-place pile construction platform of the present invention; Figure 3 This is a schematic cross-sectional view of the nearshore section structure of the present invention; Figure 4 This is a schematic diagram of the reserved pile hole in the present invention; Figure 5 This is a detailed connection diagram of the first steel pipe pile of the present invention; Figure 6 This is a detailed view of the bridge deck of the present invention; Figure 7 This is a schematic diagram showing the arrangement of the structural health monitoring components of the present invention; Figure 8 This is a schematic diagram of the connection of the reinforcing vertical rod of the present invention.

[0017] In the diagram: 1. Nearshore section structure; 2. Offshore section structure; 3. Transition pier; 4. Pile top beam; 5. Bridge deck; 6. Reserved pile holes; 7. Pile hole cover plate; 8. First steel pipe pile; 9. Steel main beam; 10. Second steel pipe pile; 11. Bailey bridge beam; 12. Steel frame; 13. Patterned steel plate; 14. Shear brace; 15. Stiffening rib; 16. Structural health monitoring component; 17. Reinforcing vertical bar. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] like Figures 1-8 As shown, an integrated structure of a temporary steel trestle bridge and a cast-in-place pile construction platform includes a temporary steel trestle bridge arranged along the shoreline and a cast-in-place pile construction platform laid on the temporary steel trestle bridge. The temporary steel trestle bridge includes a near-shore section structure 1 and a far-shore section structure 2, with a transition pier 3 between the near-shore section structure 1 and the far-shore section structure 2. The transition pier 3 is connected to the near-shore section structure 1 and the far-shore section structure 2 on both sides by a pile top crossbeam 4. The cast-in-place pile construction platform includes a bridge deck 5, which is laid on the near-shore section structure 1 and the far-shore section structure 2. The bridge deck 5 has reserved pile holes 6 corresponding one-to-one with the pile positions of the cast-in-place piles, and each reserved pile hole 6 is covered with a removable pile hole cover plate 7.

[0020] This temporary steel trestle bridge is integrated with the cast-in-place pile construction platform. The high-load-bearing steel main beams are used in the near-shore heavy load concentration area, while the lightweight and high-strength Bailey beams are used in the long-distance crossing area on the far shore. This significantly reduces the amount of steel used while ensuring safety. The transition piers are smooth and the structure is continuously stressed.

[0021] The nearshore section structure 1 includes multiple first steel pipe piles 8, which are arranged in pairs and in rows at intervals along the longitudinal direction. The upper end of the first steel pipe piles 8 is connected to the steel main beam 9, and the upper end of the steel main beam 9 is connected to the bridge deck 5. Horizontal bracing and cross bracing 14 are provided between the multiple first steel pipe piles 8.

[0022] The main steel beam 9 is adopted, which has high structural rigidity and high load-bearing capacity, meeting the heavy load requirements of large construction machinery concentrated in the near-shore section; the first steel pipe pile 8, together with the scissor bracing 14, forms a stable frame, with good horizontal force resistance of the pile foundation and sufficient safety reserve.

[0023] The offshore section structure 2 includes multiple second steel pipe piles 10, which are arranged in pairs and arranged in rows at intervals along the longitudinal direction; the upper end of the second steel pipe piles 10 is connected to Bailey beams 11, and the upper end of Bailey beams 11 is connected to the bridge deck 5.

[0024] As shown in the figure, at the support point of the Bailey beam that is off-node from the Bailey panel node, a reinforcing vertical rod 17 is provided at the off-node location. The reinforcing vertical rod 17 is connected to the Bailey panel by bolts to reinforce the non-node stress-bearing part.

[0025] Bailey Beam 11 is a standardized prefabricated truss, lightweight and with strong spanning capacity, suitable for long-distance spanning in deep waters off the coast, reducing steel input; the addition of reinforcing vertical members 17 solves the local stress defects caused by non-node supports, improving the reliability of Bailey Beam 11. The bridge deck 5 is composed of a steel frame 12 and a patterned steel plate 13 welded to it, and is assembled in a standard modular manner, allowing for complete disassembly and reuse. Steel guardrails are installed on both sides of the bridge deck 5, and kick plates are installed on the underside of the steel guardrails.

[0026] The steel frame 12 is made of I-beams; the patterned steel plate 13 is not less than 10mm thick; adjacent modules are connected by fasteners or reverse-clamped channel steel, and can be hoisted and disassembled as a whole.

[0027] The temporary steel trestle bridge is integrated with the pile foundation construction platform, and the platform bridge deck uses detachable pile hole cover plates to achieve "one bridge for multiple uses". The cover plates can be opened for operation during pile foundation construction and closed for passage after construction is completed, which greatly reduces the amount of temporary works and the time occupied by the sea area.

[0028] Using a steel frame and standard modules of patterned steel plates, the system is prefabricated in the factory, quickly assembled on site, and disassembled and reused as a whole after completion, which meets the requirements of green construction and circular economy.

[0029] The upper sidewalls of multiple first steel pipe piles 8 and multiple second steel pipe piles 10 are all equipped with stiffening ribs 15 that reinforce the top bridge deck 5. The diameters of the first steel pipe piles 8 and the second steel pipe piles 10 are 600~650mm and the wall thickness is 8~10mm. Their pile lengths are determined differently based on the results of engineering geological survey drilling arranged in sections along the longitudinal direction of the bridge, so that the pile ends fall on the bearing layer with the required bearing capacity. The pile lengths of steel pipe piles in different sections of the same structure are different.

[0030] In areas with fluctuating water levels or sections with large free sections of steel pipe piles, floating boxes are installed between adjacent steel pipe piles or below load-bearing beams to provide additional vertical support. The floating boxes provide buoyancy as the water level rises and falls, thereby reducing the effective calculated length of the steel pipe piles and improving their stability under the action of waves and currents.

[0031] It also includes multiple sets of structural health monitoring components 16; the multiple sets of structural health monitoring components 16 are respectively arranged on the temporary steel trestle bridge and the cast-in-place pile construction platform, and are connected to the data acquisition and display terminal for communication.

[0032] The structural health monitoring component 16 includes a vibrating wire strain sensor, a wire displacement sensor, and a piezoelectric accelerometer. The vibrating wire strain sensor is installed on the stress-critical sections of the load-bearing beam and Bailey beam to collect structural strain. The wire displacement sensor is used to collect component deflection deformation. The piezoelectric accelerometer collects structural vibration response. The signals from each sensor are connected to a multi-channel data acquisition terminal to realize real-time acquisition, storage, and data transmission of strain, deflection, and vibration response during the construction period.

[0033] A construction method for an integrated structure of a temporary steel trestle bridge and a cast-in-place pile construction platform includes the following steps: S1. Conduct engineering geological surveys along the longitudinal zones of the bridge site. Based on the stratum distribution and bearing capacity index revealed by each survey borehole, and combined with the calculation results of the vertical ultimate bearing capacity of a single pile, determine the differentiated pile lengths of the first steel pipe pile 8 and the second steel pipe pile 10 in each zone, so that the bearing capacity of a single pile is not less than the design value of the pile top reaction force, and compile a pile driving operation table accordingly. S2. According to the pile driving operation schedule, drive the first steel pipe pile 8 and the second steel pipe pile 10 to the design elevation respectively; complete the pile head treatment, and weld stiffening ribs 15 to the upper end of the first steel pipe pile 8 and the second steel pipe pile 10; install scissor bracing 14 between multiple first steel pipe piles 8. S3. Install transition pier 3 and pile top beam 4; hoist and position the steel main beam 9 of nearshore section structure 1, assemble Bailey beam 11 of offshore section structure 2, and complete the transition connection between nearshore section structure 1 and offshore section structure 2 at transition pier 3 through pile top beam 4. S4. Modularly lay bridge deck 5, and simultaneously install steel guardrails and kick plates; open reserved pile holes 6 at the corresponding pile positions on the cast-in-place pile construction platform, and assemble detachable pile hole cover plates 7; pour concrete into the corresponding cast-in-place pile positions through the reserved pile holes 6.

[0034] S5. Install multiple sets of structural health monitoring components 16 at the mid-span of the load-bearing beam, the support section, the pile top, and the maximum stress zone of the Bailey beam, and connect them to the data acquisition and display terminal; mark traffic zone markings and install load limit and speed limit signs on the bridge deck 5 to complete the dynamic load zone control of the bridge deck. S6. During construction, structural response data will be collected in real time through the structural health monitoring component 16. Based on the monitoring data, the layout of construction vehicles and the load and speed limits will be dynamically adjusted. Static load tests will be carried out on key piers in conjunction with the monitoring data. After the permanent structure of the waterway project is completed, the bridge deck 5 and the superstructure will be completely dismantled and transferred for reuse in subsequent projects.

[0035] This temporary steel trestle bridge and the cast-in-place pile construction platform are integrated into one structure. The nearshore section structure 1 uses steel main beams 9 to adapt to heavy-load conditions, while the offshore section structure 2 uses Bailey beams 11 to achieve a large span. The two structural forms are smoothly connected by transition piers 3, taking into account both the nearshore bearing capacity and the economy of offshore crossing, and solving the problems of large steel consumption and insufficient nearshore safety reserves of a single structural form. By integrating the temporary steel trestle bridge and the cast-in-place pile construction platform into one, the removable pile hole cover plates 7 can switch between traffic and construction conditions, eliminating the need to set up two separate temporary facilities, reducing the amount of temporary work, shortening the time of occupation of the sea area, and facilitating the coordination of on-site construction organization.

[0036] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. 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. An integrated structure of temporary steel trestle bridge and cast-in-place pile construction platform, characterized in that, include: A temporary steel trestle bridge is arranged along the shoreline, and a pile foundation construction platform is laid on the temporary steel trestle bridge; The temporary steel trestle bridge includes a near-shore section structure (1) and a far-shore section structure (2). A transition pier (3) is provided between the near-shore section structure (1) and the far-shore section structure (2). The near-shore section structure (1) and the far-shore section structure (2) located on both sides are connected by a pile top beam (4) on the transition pier (3). The construction platform for the cast-in-place piles includes a bridge deck (5), which is laid on the near-shore section structure (1) and the far-shore section structure (2). The bridge deck (5) has reserved pile holes (6) corresponding to the pile positions of the cast-in-place piles, and each reserved pile hole (6) is covered with a detachable pile hole cover plate (7).

2. The integrated structure of temporary steel trestle bridge and cast-in-place pile construction platform according to claim 1, characterized in that, The nearshore section structure (1) includes: Multiple first steel pipe piles (8) are arranged in pairs, and multiple pairs of steel pipe piles are arranged in rows at intervals along the longitudinal direction; the upper end of the first steel pipe pile (8) is connected to the steel main beam (9), and the upper end of the steel main beam (9) is connected to the bridge deck (5).

3. The integrated structure of temporary steel trestle bridge and cast-in-place pile construction platform according to claim 2, characterized in that, The offshore section structure (2) includes: Multiple second steel pipe piles (10) are arranged in pairs, and multiple pairs of steel pipe piles are arranged in rows at intervals along the longitudinal direction; the upper end of the second steel pipe pile (10) is connected to the Bailey beam (11), and the upper end of the Bailey beam (11) is connected to the bridge deck (5).

4. The integrated structure of temporary steel trestle bridge and cast-in-place pile construction platform according to claim 1, characterized in that, The bridge deck (5) is composed of a steel frame (12) and a patterned steel plate (13) welded thereon.

5. The integrated structure of temporary steel trestle bridge and cast-in-place pile construction platform according to claim 1, characterized in that, A horizontally connected and cross-arranged scissor bracing (14) is provided between multiple first steel pipe piles (8).

6. The integrated structure of temporary steel trestle bridge and cast-in-place pile construction platform according to claim 3, characterized in that, The upper sidewalls of the multiple first steel pipe piles (8) and the multiple second steel pipe piles (10) are all provided with stiffening ribs (15) that are reinforced to connect the top bridge deck (5).

7. The integrated structure of temporary steel trestle bridge and cast-in-place pile construction platform according to claim 1, characterized in that, Both sides of the bridge deck (5) are provided with steel guardrails, and the lower side of the steel guardrails is provided with kickboards.

8. The integrated structure of temporary steel trestle bridge and cast-in-place pile construction platform according to claim 1, characterized in that, It also includes multiple sets of structural health monitoring components (16); the multiple sets of structural health monitoring components (16) are respectively arranged on the temporary steel trestle bridge and the cast-in-place pile construction platform, and are connected to the data acquisition and display terminal for communication.

9. A construction method for an integrated structure of temporary steel trestle bridge and cast-in-place pile construction platform as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Conduct engineering geological surveys along the longitudinal zone of the bridge site. Based on the stratum distribution and bearing capacity index revealed by each survey borehole, and combined with the calculation results of the vertical ultimate bearing capacity of a single pile, determine the differentiated pile lengths of the first steel pipe pile (8) and the second steel pipe pile (10) in each zone, so that the bearing capacity of a single pile is not less than the design value of the pile top reaction force, and compile a pile driving operation table accordingly. S2. According to the pile driving operation schedule, drive the first steel pipe pile (8) and the second steel pipe pile (10) to the design elevation respectively; complete the pile head treatment, and weld stiffening ribs (15) to the upper end of the first steel pipe pile (8) and the second steel pipe pile (10); install scissor bracing (14) between multiple first steel pipe piles (8). S3. Install the transition pier (3) and the pile top beam (4); hoist and position the steel main beam (9) of the near shore section structure (1), assemble the Bailey beam (11) of the far shore section structure (2), and complete the transition connection between the near shore section structure (1) and the far shore section structure (2) at the transition pier (3) through the pile top beam (4). S4. Modularly lay bridge deck (5), and simultaneously install steel guardrails and kickboards; open reserved pile holes (6) at the corresponding pile positions on the cast-in-place pile construction platform, and assemble detachable pile hole cover plates (7); pour concrete for the corresponding cast-in-place pile positions through the reserved pile holes (6); S5. Install multiple sets of structural health monitoring components (16) at the mid-span of the load-bearing beam, the support section, the top of the pile, and the maximum stress zone of the Bailey beam, and connect them to the data acquisition and display terminal; mark traffic zone markings and set up load and speed limit signs on the bridge deck (5) to complete the dynamic load zone control of the bridge deck; S6. During construction, the structural response data is collected in real time through the structural health monitoring component (16). Based on the monitoring data, the layout of construction vehicles and the load and speed limits are dynamically adjusted. Static load tests are carried out on key piers in conjunction with the monitoring data. After the permanent structure of the waterway project is completed, the bridge deck (5) and the upper steel structure are dismantled as a whole and transferred for reuse in subsequent projects.

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