A construction method of a safety ladder cage for a continuous rigid frame bridge with underwater piers

Abstract

This invention relates to the field of highway bridge technology and discloses a method for constructing a safety ladder cage for a continuous rigid frame bridge with piers in water. The method includes the following steps: erecting a temporary pile driving platform; driving precast steel pipe piles to obtain the installation foundation; erecting a first transfer channel between the temporary pile driving platform and the precast steel pipe piles; installing longitudinal beams on the installation foundation; installing a ladder cage installation platform on the longitudinal beams; installing a first precast ladder cage on the ladder cage installation platform; erecting a second transfer channel between the first precast ladder cage and the first pier in water; installing a second precast ladder cage on the first pier in water; and erecting a third transfer channel. This method for constructing a safety ladder cage for a continuous rigid frame bridge with piers in water is simple in procedure, allows for rapid, low-cost, and environmentally friendly erection of safety ladder cages in water flow, and facilitates continuous operation between adjacent piers in water.

Description

Technical Field

[0001] This invention relates to the field of highway bridge technology, and in particular to a method for constructing a safety ladder cage for a continuous rigid frame bridge with underwater piers. Background Technology

[0002] With the rapid development of the expressway industry, bridges are often added during expressway construction to overcome natural obstacles such as rivers, lakes, and canyons. The bridge piers, cap beams, No. 0 blocks, and continuous rigid frame structures are located in or along the edges of rivers, lakes, and canyons. During construction, ladders or cages need to be erected in the water to provide access for workers.

[0003] Traditional safety ladder cages are erected directly on flat ground. This method requires a high-quality foundation and is greatly affected by terrain and topography, necessitating foundation reconstruction. Reconstruction of foundations in rivers, lakes, and canyons is costly, and underwater reconstruction requires work in flowing water, posing safety hazards. Furthermore, using cast-in-place concrete piles as the foundation results in complex construction procedures, high costs, environmental unfriendliness, and low efficiency. Traditional safety ladder cages are also inconvenient for changing work locations. Therefore, traditional methods of constructing safety ladder cages cannot meet the construction access needs of various bridge structures in flowing water.

[0004] To address the above problems, a method is needed to design a way to construct safe ladder cages in the flow of water in rivers, lakes, and canyons. Summary of the Invention

[0005] This invention provides a method for constructing a safety ladder cage for a continuous rigid frame bridge with underwater piers. The purpose is to solve the problems of traditional safety ladder cage erection methods, such as the inability to carry out construction operations in rivers, lakes, and canyons, complex procedures, high costs, environmental unfriendliness, low efficiency, and inconvenience in changing operations.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] The present invention discloses a construction method for a safety ladder cage for a continuous rigid frame bridge with underwater piers, comprising the following steps:

[0008] a. Erect a temporary pile driving platform near the construction area of ​​the underwater pier;

[0009] b. The pile driver is positioned on the temporary pile driving platform, and the pile driver is activated to drive the bottom end of the precast steel pipe pile through the mud layer in the water into the foundation rock layer, with the top end of the precast steel pipe pile above the water surface.

[0010] c. Construct a first transfer passage between the temporary pile driving platform and the precast steel pipe pile;

[0011] d. Install a longitudinal beam at the top of the precast steel pipe pile;

[0012] e. Install a ladder cage installation platform at the top of the longitudinal beam;

[0013] f. Install the first prefabricated ladder cage on the ladder cage installation platform;

[0014] g. Construct a second transfer passage between the top of the first prefabricated ladder cage and the top of the first underwater pier adjacent to it;

[0015] h. Install a second prefabricated ladder cage at the top of the first underwater pier;

[0016] i. Construct a third transfer passage between the second prefabricated ladder cage and the second underwater pier near the first underwater pier.

[0017] Furthermore, the first prefabricated ladder cage and the second prefabricated ladder cage are prefabricated ladder cages with the same structure, each prefabricated ladder cage is equipped with a safety door, and each prefabricated ladder cage is equipped with a ladder.

[0018] Furthermore, in step d, the longitudinal beam is an I-shaped structural member, including an upper plate, a connecting plate, and a lower plate connected sequentially from top to bottom. The connecting plate and the lower plate form a convex structural member. The top of the precast steel pipe pile is provided with a through groove that mates with the convex structural member. The convex structural member passes through the through groove, and the longitudinal beam and the precast steel pipe pile are engaged.

[0019] Furthermore, the number of precast steel pipe piles is multiple, and the tops of all the precast steel pipe piles are located on the same plane.

[0020] Furthermore, the number of precast steel pipe piles is four, and the tops of the four precast steel pipe piles are connected in sequence to form a square structure. The number of longitudinal beams is two, and the two longitudinal beams are arranged in parallel at the tops of the four precast steel pipe piles.

[0021] Furthermore, connecting members are provided between adjacent precast steel pipe piles.

[0022] Furthermore, there are multiple first prefabricated ladder cages and multiple second prefabricated ladder cages. The multiple first prefabricated ladder cages and multiple second prefabricated ladder cages are fixedly stacked layer by layer. The overlapping joints of adjacent first prefabricated ladder cages and adjacent second prefabricated ladder cages are provided with openings. The ladders in adjacent first prefabricated ladder cages and adjacent second prefabricated ladder cages are connected through the corresponding openings.

[0023] Furthermore, support members are provided between the first prefabricated ladder cage and the first underwater pier, and between the second prefabricated ladder cage and the second underwater pier.

[0024] Furthermore, there are multiple support members, which are spaced apart from top to bottom.

[0025] Furthermore, the support includes two parallel first support rods, with each first support rod having its two ends respectively disposed on the prefabricated ladder cage and the underwater pier. The two first support rods, the underwater pier, and the connecting part of the prefabricated ladder cage are sequentially connected to form a square structure. A second support rod is intersecting between the two first support rods, and the two second support rods form the diagonal of the square structure.

[0026] The beneficial effects of this invention are as follows: The construction method for safety ladder cages of continuous rigid frame bridges with underwater piers in this application can be used to construct safety ladder cages both on land foundations and in the flow of rivers, lakes, and canyons, thus having a wide range of applications. Using a pile driver to drive piles into the foundation rock layer as the foundation for the precast ladder cage installation eliminates the need for underwater operations and modification of the foundation rock layer, preventing environmental damage and pollution. This method offers high operational safety, high construction efficiency, and shortens the construction cycle. The method is simple in procedure and allows for the rapid, low-cost, and environmentally friendly construction of safety ladder cages in the flow of rivers, lakes, and canyons. The top of the precast steel pipe piles is above the water surface, avoiding the impact of water flow and seasonal water level rises on the precast ladder cages, thus improving the safety and stability of the safety ladder cages. The arrangement of the first precast ladder cage, the second transfer channel, the second precast ladder cage, and the third transfer channel facilitates continuous operation between adjacent underwater piers. Attached Figure Description

[0027] Figure 1 This is a construction flowchart of the construction method for the safety ladder cage of a continuous rigid frame bridge with underwater piers according to the present invention.

[0028] Figure 2 This is a construction schematic diagram of the safety ladder cage for the underwater continuous rigid frame bridge of the present invention;

[0029] Figure 3 This is a schematic diagram of the precast steel pipe pile driving in the embodiment;

[0030] Figure 4 This is a schematic diagram of the installation of the first prefabricated ladder cage in the embodiment;

[0031] Figure 5 This is a structural schematic diagram of the support member in the embodiment.

[0032] Reference numerals: 1. Second precast ladder cage; 2. Second transfer channel; 3. First precast ladder cage; 4. Ladder; 5. Support component; 501. First support rod; 502. Second support rod; 6. First transfer channel; 7. Ladder cage installation platform; 8. Longitudinal beam; 9. Connector; 10. Temporary pile driving platform; 11. Precast steel pipe pile; 12. Foundation rock layer; 13. Water surface; 14. First underwater pier; 15. Second underwater pier; 16. Block 0; 17. Third transfer channel; 18. Pile driving machine; 19. Steel plate. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0034] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, the construction method for the safety ladder cage of a continuous rigid frame bridge with underwater piers according to the present invention includes the following steps:

[0035] a. Erect a temporary pile driving platform 10 near the construction area of ​​the underwater pier;

[0036] b. The pile driving machine 18 is positioned on the temporary pile driving platform, and the pile driving machine 18 is turned on to drive the bottom end of the precast steel pipe pile 11 through the mud layer in the water into the foundation rock layer 12. The top end of the precast steel pipe pile 11 is higher than the water surface 13.

[0037] c. Construct a first transfer channel 6 between the temporary pile driving platform 10 and the precast steel pipe pile 11;

[0038] d. Install a longitudinal beam 8 at the top of the precast steel pipe pile 11;

[0039] e. Install a ladder cage mounting platform 7 at the top of the longitudinal beam 8;

[0040] f. Install the first prefabricated ladder cage 3 on the ladder cage installation platform 7;

[0041] g. Construct a second transfer channel 2 between the top of the first prefabricated ladder cage 3 and the top of the first underwater pier 14 adjacent to it;

[0042] h. Install a second prefabricated ladder cage 1 at the top of the first water-supported pier 14;

[0043] i. Construct a third transfer passage 17 between the second prefabricated ladder cage 1 and the second underwater pier 15 near the first underwater pier 14.

[0044] The construction method for safety ladder cages in continuous rigid frame bridges with underwater piers based on the above-mentioned structure allows for the erection of safety ladder cages both on land foundations and in the flow of rivers, lakes, and canyons, offering a wide range of applications. When erecting safety ladder cages on land foundations or dry foundations, the construction of a first transfer channel 6 is not required. Piles are driven into the foundation rock layer using a pile driver, serving as the foundation for the precast ladder cage installation. This eliminates the need for underwater operations and modification of the foundation rock layer, avoiding damage to the underwater foundation and pollution associated with using cast-in-place concrete piles. It avoids environmental damage and pollution, ensuring high operational safety and construction efficiency, and shortening the construction cycle. This method is simple in procedure and allows for the rapid, low-cost, and environmentally friendly erection of safety ladder cages in the flow of rivers, lakes, and canyons. The safety ladder cage consists of precast steel pipe piles 11, longitudinal beams 8, a ladder cage installation platform 7, and the precast ladder cage itself. Its simple structure and fewer installation steps reduce the installation and erection time of the safety ladder cage, shorten the construction cycle, improve construction efficiency, and lower construction costs. The top of the precast steel pipe pile 11 is higher than the water surface (e.g., the top of the precast steel pipe pile 11 is 0.5m-2m higher than the water surface), which effectively avoids the impact of water flow and seasonal rise in water level on the precast ladder cage, and improves the safety and stability of the safety ladder cage. Construction workers enter the first precast ladder cage 3 through the first transfer passage 6, then climb up to the second transfer passage 2 within the first precast ladder cage 3, and reach the first underwater pier 14 through the second transfer passage 2 to begin construction on the first underwater pier 14. They then reach the second underwater pier 15 through the third transfer passage 17 to begin construction on the second underwater pier 15. At this point, the third transfer passage 17 is erected between the first underwater pier 14 and the second underwater pier 15 (if, in the early stages of construction, the construction progress and height of the first underwater pier 14 and the second underwater pier 15 are roughly the same, the third transfer passage 17 is erected on top of the first underwater pier 14 and the second underwater pier 15). In the later stages of construction, when the height of block 0 16 is higher than that of the first underwater pier 14, and construction on block 0 16 at the top of the second underwater pier 15 is required, the second precast ladder cage 1 needs to be installed at the top of the first underwater pier 14, and the third transfer passage 17 is erected on top of the second underwater pier 15. One end of the transfer channel 17 near the second underwater pier 15 can be erected on top of block 0 16. Construction workers enter the second precast ladder cage 1, then climb up inside the second precast ladder cage 1 to the third transfer channel 17, and reach block 0 16 through the third transfer channel 17 to carry out construction on block 0 16 at the top of the second underwater pier 15. When it is necessary to switch from the second underwater pier 15 (or block 0 16) to the first underwater pier 14 during construction, construction workers reach the first underwater pier 14 from the third transfer channel 17 (or descend from the second precast ladder cage 1 to the first underwater pier 14) to carry out construction on the first underwater pier 14. This allows for continuous operation between adjacent first underwater piers 14 and second underwater piers 15, which is very convenient and can improve construction efficiency. After construction is completed, workers can withdraw through the first transfer channel 6.During the construction of the first pier 14 and the second pier 15 in the water, steel structures (such as steel scaffolding) can be erected on the side walls of the first pier 14 and the second pier 15 in the water.

[0045] The first prefabricated ladder cage 3 and the second prefabricated ladder cage 1 are prefabricated ladder cages with the same structure. Each prefabricated ladder cage is equipped with a safety door and a ladder 4 is installed inside each prefabricated ladder cage.

[0046] The first precast ladder cage 3 and the second precast ladder cage 1 are precast ladder cages with the same structure. Using precast ladder cages can further reduce construction time, shorten the construction period, and reduce environmental pollution. The precast ladder cage consists of a top plate, a bottom plate, columns, and side plates (or protective nets). Safety doors are opened on the side plates (or protective nets).

[0047] Specifically, in step d, the longitudinal beam 8 is an I-shaped structural member, including an upper plate, a connecting plate, and a lower plate connected sequentially from top to bottom. The connecting plate and the lower plate form a convex structural member. The top of the precast steel pipe pile 11 is provided with a through groove that mates with the convex structural member. The convex structural member passes through the through groove. The longitudinal beam 8 and the precast steel pipe pile 11 are snapped together.

[0048] The longitudinal beam 8 and the precast steel pipe pile 11 are fixed by a snap-fit ​​method, making the connection more secure. After the longitudinal beam 8 and the precast steel pipe pile 11 are snap-fitted, they are then welded or bolted together, making the longitudinal beam 8 and the precast steel pipe pile 11 a single unit, resulting in a more reliable and stable connection. The top of the precast steel pipe pile 11 is cut to create a through groove that mates with the convex structural component.

[0049] The number of precast steel pipe piles 11 is multiple, and the multiple precast steel pipe piles 11 are evenly spaced, with the tops of all the precast steel pipe piles 11 located on the same plane.

[0050] The installation of multiple precast steel pipe piles 11 provides better support for the longitudinal beam 8, making it less prone to tilting, and further provides better support for the ladder cage installation platform 7, making the installation of the ladder cage platform 7 more stable. By using a method based on the penetration depth and elevation of the top of the precast steel pipe piles 11, the tops of all precast steel pipe piles 11 are located on the same horizontal plane, ensuring that each precast steel pipe pile 11 provides support for the ladder cage installation platform 7. The number of precast steel pipe piles 11 can be two, three, four, or more.

[0051] Preferably, there are four precast steel pipe piles 11, and the tops of the four precast steel pipe piles 11 are connected in sequence to form a square structure. There are two longitudinal beams 8, and the two longitudinal beams 8 are arranged in parallel at the tops of the four precast steel pipe piles 11.

[0052] Adjacent precast steel pipe piles 11 form a group, and the four precast steel pipe piles 11 are divided into two groups. A longitudinal beam 8 is fixed through one group of precast steel pipe piles 11. Each group of precast steel pipe piles 11 provides better support for the corresponding longitudinal beam 8. The ladder cage installation platform 7 is set on the top surface of the longitudinal beam 8, thus achieving stable support for the ladder cage installation platform 7 with fewer precast steel pipe piles 11. The tops of the four precast steel pipe piles 11 are connected in sequence to form a square structure, which is beneficial for the erection and support of the ladder cage installation platform 7.

[0053] Preferably, a connector 9 is provided between adjacent precast steel pipe piles 11.

[0054] The connector 9 connects the precast steel pipe piles 11 together, making all the precast steel pipe piles 11 a whole. The influence of external forces on a single precast steel pipe pile 11 becomes the influence of external forces (water flow impact force, wind force, etc.) on the whole, increasing the safety and stability of the precast steel pipe piles 11, thereby ensuring the safety and stability of the ladder cage installation platform 7, and further ensuring the stability of the safety ladder cage structure.

[0055] The number of the first prefabricated ladder cage 3 and the second prefabricated ladder cage 1 are both multiple. The multiple prefabricated ladder cages and the multiple second prefabricated ladder cages 1 are fixedly stacked layer by layer. The overlapping joints of adjacent first prefabricated ladder cages 3 and adjacent second prefabricated ladder cages 1 are provided with openings. The ladders 4 in adjacent first prefabricated ladder cages 3 and adjacent second prefabricated ladder cages 1 are connected through the corresponding openings.

[0056] The number of the first precast ladder cage 3 and the second precast ladder cage 1 can be flexibly set according to the specific construction design elevation requirements. For example, after reaching the construction design elevation, the first precast ladder cage 3 and the second precast ladder cage 1 will no longer be stacked and heightened, which facilitates installation and disassembly. Two adjacent first precast ladder cages 3 and two adjacent second precast ladder cages 1 can be fixed by welding or bolt connection.

[0057] Preferably, support members 5 are provided between the first prefabricated ladder cage 3 and the first underwater pier 14, and between the second prefabricated ladder cage 1 and the second underwater pier 15.

[0058] Support members 5 are provided between the first precast ladder cage 3 and the first underwater pier 14, between the second precast ladder cage 1 and the second underwater pier 15 (the height of the second underwater pier 15 is higher than the height of the first underwater pier 14), and between the top 0 block 16 of the second precast ladder cage 1 and the second underwater pier 15. These support members connect the first precast ladder cage 3 and the first underwater pier 14 as a whole, and connect the second precast ladder cage 1 and the second underwater pier 15 as a whole, increasing the safety and stability of the first precast ladder cage 3 and the second precast ladder cage 1. Steel plates 19 can be embedded in the first underwater pier 14 and the second underwater pier 15, and the corresponding steel plates 19 can be welded to the columns of the first precast ladder cage 3 and the second precast ladder cage 1, respectively. Alternatively, holes can be made in the columns of the first precast ladder cage 3 and the second precast ladder cage 1 and the steel plates 19, and the columns of the precast ladder cage and the steel plates 19 can be fixedly connected by bolts.

[0059] The number of the support members 5 is multiple, and the multiple support members 5 are arranged at intervals from top to bottom.

[0060] Multiple support components are spaced 5 times apart (e.g., 3m-6m apart) to meet the height requirements of the safety cage and improve the overall safety and stability of the safety cage.

[0061] Specifically, the support member 5 includes two parallel first support rods 501. The two ends of each first support rod 501 are respectively set on the prefabricated ladder cage and the underwater pier. The two first support rods 501, the underwater pier, and the connecting part of the prefabricated ladder cage are connected in sequence to form a square structure. A second support rod 502 is intersected between the two first support rods 501. The two second support rods 502 form the diagonal of the square structure.

[0062] The use of a cross-connection (scissor type) makes the connection between the first precast ladder cage 3 and the first underwater pier 14, the second precast ladder cage 1 and the second underwater pier 15 more reliable and stable, thereby making the safety ladder cage safer and more stable. The connector 9 can be used in the form of the support 5 to connect the precast steel pipe piles 11 into a whole, making the precast steel pipe piles 11 safer and more stable after being connected as a whole.

Claims

1. A method for constructing a safety ladder cage for a continuous rigid frame bridge with underwater piers, characterized in that, Includes the following steps: a. Erect a temporary pile driving platform near the construction area of ​​the underwater pier (10); b. The pile driving machine (18) is positioned on the temporary pile driving platform, and the pile driving machine (18) is turned on to drive the bottom end of the precast steel pipe pile (11) through the mud layer in the water into the foundation rock layer (12). The top end of the precast steel pipe pile (11) is higher than the water surface (13). There are multiple precast steel pipe piles (11). The top ends of all the precast steel pipe piles (11) are located on the same plane. Connecting parts (9) are provided between adjacent precast steel pipe piles (11). c. Construct a first transfer channel (6) between the temporary pile driving platform (10) and the precast steel pipe pile (11); d. A longitudinal beam (8) is installed at the top of the precast steel pipe pile (11). The longitudinal beam (8) is an I-shaped structural member, including an upper plate, a connecting plate and a lower plate connected from top to bottom. The connecting plate and the lower plate form a convex structural member. A through groove is opened at the top of the precast steel pipe pile (11) to cooperate with the convex structural member. The convex structural member passes through the through groove. The longitudinal beam (8) and the precast steel pipe pile (11) are engaged. e. Install a ladder cage installation platform (7) at the top of the longitudinal beam (8); f. Install the first prefabricated ladder cage (3) on the ladder cage installation platform (7); g. Construct a second transfer passage (2) between the top of the first prefabricated ladder cage (3) and the top of the first underwater pier (14) near it; h. Install a second prefabricated ladder cage (1) at the top of the first underwater pier (14); i. Construct a third transfer passage (17) between the second prefabricated ladder cage (1) and the second underwater pier (15) near the first underwater pier (14).

2. The construction method for a safety ladder cage of a continuous rigid frame bridge with underwater piers according to claim 1, characterized in that, The first prefabricated ladder cage (3) and the second prefabricated ladder cage (1) are prefabricated ladder cages with the same structure. The prefabricated ladder cages are equipped with safety doors, and each prefabricated ladder cage is equipped with a ladder (4).

3. The construction method for a safety ladder cage of a continuous rigid frame bridge with underwater piers according to claim 1, characterized in that, The number of precast steel pipe piles (11) is four, and the tops of the four precast steel pipe piles (11) are connected in sequence to form a square structure. The number of longitudinal beams (8) is two, and the two longitudinal beams (8) are arranged in parallel at the tops of the four precast steel pipe piles (11).

4. The construction method for a safety ladder cage of a continuous rigid frame bridge with underwater piers according to claim 2, characterized in that, There are multiple first prefabricated ladder cages (3) and multiple second prefabricated ladder cages (1). Multiple first prefabricated ladder cages and multiple second prefabricated ladder cages (1) are fixedly stacked layer by layer. The overlapping joints of adjacent first prefabricated ladder cages (3) and adjacent second prefabricated ladder cages (1) are provided with openings. The ladders (4) in adjacent first prefabricated ladder cages (3) and adjacent second prefabricated ladder cages (1) are connected through the corresponding openings.

5. The construction method for a safety ladder cage of a continuous rigid frame bridge with underwater piers according to claim 4, characterized in that, Support members (5) are provided between the first prefabricated ladder cage (3) and the first underwater pier (14), and between the second prefabricated ladder cage (1) and the second underwater pier (15).

6. The construction method for a safety ladder cage of a continuous rigid frame bridge with underwater piers according to claim 5, characterized in that, The number of the support members (5) is multiple, and the multiple support members (5) are arranged at intervals from top to bottom.

7. The construction method for a safety ladder cage of a continuous rigid frame bridge with underwater piers according to claim 6, characterized in that, The support member (5) includes two parallel first support rods (501). The two ends of each first support rod (501) are respectively set on the prefabricated ladder cage and the underwater pier. The two first support rods (501), the underwater pier, and the connecting part of the prefabricated ladder cage are connected in sequence to form a square structure. A second support rod (502) is intersected between the two first support rods (501). The two second support rods (502) form the diagonal of the square structure.

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