Construction methods for large-span, large-section steel box girders

Abstract

This invention relates to a construction method for large-span, large-section steel box girders. It utilizes temporary piles combined with square columns to form an effective temporary support structure, ensuring the stability of the steel box girder during construction and thus reducing construction safety hazards. The lifting system is equipped with lifting rods, enabling efficient hoisting and positioning of the steel box girder. This design allows for the smooth lifting of assembled steel box girders even with large spans, ensuring smooth construction progress. Using existing bridge decks as a construction platform, combined with the installation of temporary supports and fixed bases, simplifies construction steps and improves construction efficiency. By ensuring a reliable connection between the No. 0 steel box girder and the assembled steel box girder, the overall structural stability and load-bearing capacity are optimized, thereby improving the overall bridge's engineering quality and service life.

Description

Technical Field

[0001] This invention belongs to the field of bridge engineering and its construction technology, and particularly relates to a construction method for large-span, large-section steel box girders. Background Technology

[0002] With the increasing demand for transportation, long-span bridges are playing an increasingly important role in modern infrastructure construction. These bridges have advantages such as high load-bearing capacity, large span, and long service life, which can effectively improve traffic flow and boost regional economic development. However, traditional bridge construction methods often face problems such as high construction difficulty, long construction period, and safety hazards when dealing with long-span, high-section steel box girders.

[0003] In the construction of long-span bridges, the use of steel box girder structures has become a mainstream trend. Steel box girders not only possess excellent bending and torsional resistance but also effectively reduce their self-weight, lowering the load on the substructure. Furthermore, the manufacture and transportation of steel box girders are more convenient, making them suitable for large-scale bridge projects. However, the installation of steel box girders often requires complex temporary support systems to ensure their stability and safety during construction.

[0004] Currently, many construction schemes employ auxiliary structures such as temporary piles and support beams. However, in practice, a series of problems remain, including the design, construction, and subsequent dismantling of the support system. These problems not only affect construction efficiency but may also lead to potential quality and safety hazards. Therefore, a more scientific, rational, and efficient construction method is urgently needed to solve the technical challenges in constructing large-span, large-section steel box girders. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a construction method for large-span, large-section steel box girders.

[0006] This construction method for large-span, large-section steel box girders includes the following steps:

[0007] Step 1: Arrange the first temporary piles on the pier, and install the first square column on the first temporary piles; connect the upper parts of the two first temporary piles through the first support beam; install the lifting system on the first square column;

[0008] Step 2: The second temporary pile is connected to the existing bridge deck by a transverse connecting rod, and a second square column is installed above the second temporary pile; a lifting system is installed on the second square column.

[0009] Step 3: Install a third temporary pile on the existing bridge deck, and install a third triangular column on the third temporary pile. The tops of the two third triangular columns are connected by a second support beam.

[0010] Step 4: Using the existing bridge deck as a construction platform, hoist the No. 0 steel box girder onto the cap beam of the pier column;

[0011] Step 5: Assemble the steel box girder; use the lifting system to lift the assembled steel box girder to the top surface of the first and second support beams; connect the assembled steel box girder to the No. 0 steel box girder.

[0012] As a preferred option, in step one, the construction of the temporary pier column includes two parallel first temporary piles, and a connecting piece is installed between the temporary pier column and the first temporary piles.

[0013] Preferably, in step one, the first square column has a lifting system, which includes a first lifting rod, a first lifting component, and a first lifting groove. The first lifting groove is set along the height direction of the first square column, the first lifting component is embedded in the first lifting groove, the first lifting component is connected to the first lifting rod, the first lifting rod is fixed to the assembled steel box beam, and the first lifting component can drive the first lifting rod to slide up and down in the first lifting groove.

[0014] As a preferred option, in step two, a second temporary pile is constructed to connect the existing pile with the existing bridge deck via a transverse connecting rod. The second temporary pile has a second square column, which also has a lifting system. The lifting system includes a second lifting rod, a second lifting component, and a second lifting groove. The second lifting groove is located on the second square column, and the second lifting component is embedded in the second lifting groove. The second lifting component and the second lifting rod are fixed together, and the second lifting rod is fixed to the assembled steel box girder.

[0015] Preferably, in step three, two parallel fixed bases are installed on the existing bridge plate, and the fixing bolts install the third temporary pile on the fixed bases. The third temporary pile has a third triangular column.

[0016] As a preferred option, in step four, the existing bridge deck is used as a construction platform to hoist the No. 0 steel box girder into place, and the existing piles and existing bridge deck are used as a temporary construction system.

[0017] Preferably, in step five, the first and second lifting rods are used to connect the assembled steel box girder, and a winch is used as power to lift the assembled steel box girder to the top surface of the first and second support beams.

[0018] Large-span, large-section steel box girder, obtained by any of the methods described above.

[0019] The beneficial effects of this invention are:

[0020] 1) This invention uses temporary piles combined with square columns to form an effective temporary support structure, ensuring the stability of the steel box girder during construction and thus reducing construction safety hazards.

[0021] 2) The lifting system of this invention is equipped with a lifting rod, which enables efficient hoisting and positioning of steel box girders. This design allows the assembled steel box girders to be lifted smoothly even in the case of large spans, ensuring the smooth progress of construction.

[0022] 3) This invention uses existing bridge decks as construction platforms, combined with the installation of temporary supports and fixed bases, which simplifies the construction steps and improves construction efficiency.

[0023] 4) By ensuring a reliable connection between the No. 0 steel box girder and the assembled steel box girder, this invention optimizes the stability and load-bearing capacity of the overall structure, thereby improving the overall engineering quality and service life of the bridge.

[0024] 5) This invention combines the assembly platform and the hoisting platform, which is not only suitable for the construction of large-span steel box girders, but can also be flexibly applied to other bridge types. It has good adaptability and scalability, and meets the needs of different projects. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the construction system for large-span, large-section steel box girders of the present invention;

[0026] Figure 2 Left view of the construction system for large-span, large-section steel box girder;

[0027] Figure 3 Front view of the construction system for large-span, large-section steel box girder;

[0028] Figure 4 This is a schematic diagram showing the completed installation of a large-span, large-section steel box girder.

[0029] Figure 5 This is a top view of a large-span, large-section steel box girder after installation.

[0030] Explanation of reference numerals in the attached drawings: 1. Pier; 2. Cap beam; 3. No. 0 steel box girder; 4. Assembled steel box girder; 5. Existing pile; 6. Existing bridge deck; 7. First temporary pile; 8. First square column; 9. First support beam; 10. Connector; 11. First lifting channel; 12. First lifting component; 13. First lifting rod; 14. Second temporary pile; 15. Second square column; 16. Second lifting channel; 17. Fixed base; 18. Fixing bolt; 19. Third temporary pile; 20. Third square column; 21. Transverse connecting rod; 22. Horizontal beam; 23. Second support beam; 24. Side beam; 25. Positioned steel box girder; 26. Second lifting rod; 27. Second lifting component. Detailed Implementation

[0031] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that those skilled in the art can make several modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0032] Example 1

[0033] As one example, this construction method for large-span, large-section steel box girders includes the following steps:

[0034] Step 1: Arrangement of temporary piles: Two parallel first temporary piles 7 are arranged for the construction of the temporary pier 1. Connecting parts 10 are constructed between the pier 1 and the first temporary piles 7 to ensure their verticality and stability, and to provide the necessary foundation for subsequent construction.

[0035] Step 2, Installation of the first square column 8: Install the first square column 8 on each first temporary pile 7. These columns will serve as the foundation for the subsequent support beams.

[0036] Step 3: Connection of the first support beam 9: The upper parts of the two first temporary piles 7 are connected by the first support beam 9 to form a stable support structure to provide support for the lifting system.

[0037] Step 4: Construction of the lifting system: Install the lifting system on the first square column 8, including the first lifting rod 13, the first lifting component 12 and the first lifting groove 11, to ensure that the lifting system can operate smoothly, so as to facilitate the hoisting of the steel box girder.

[0038] Step 5: Construction of the existing temporary pile 5: Install the second temporary pile 14 on the other side of the construction. The second temporary pile 14 is connected to the existing bridge deck 6 through the transverse connecting rod 21, and a second square column 15 is installed on top of it to ensure the stability and support capacity of the structure.

[0039] Step Six: Installation of the Lifting System for the Second Square Column 15: A lifting system, including a second lifting rod 26, a second lifting component 27, and a second lifting groove 16, is also installed on the second square column 15 to support the lifting of the assembled steel box girder 4. The second lifting groove 16 is located on the second square column 15, and the second lifting component 27 is embedded within it. The second lifting component 27 and the second lifting rod 26 are fixed together, and the second lifting rod 26 is also fixed to the assembled steel box girder 4.

[0040] Step 7, Installation of the third temporary pile 19: Set up parallel fixed bases 17 on the existing bridge deck 6, and use fixing bolts 18 to install the third temporary pile 19 on the fixed bases 17 to enhance the stability of the structure.

[0041] Step 8: Connection of the second support beam 23: Connect the tops of the two third-dimensional columns 20 through the second support beam 23, and at the same time install a horizontal beam 22 in the middle of the third-dimensional column 20 to further enhance the stability of the overall support frame.

[0042] Step 9, Beam Connection: Connect the third square column 20 to the adjacent second square column 15 through the side beam 24 to form a complete support system.

[0043] Step 10, hoisting of No. 0 steel box girder 3: Using the existing bridge plate 6 as a construction platform, hoist No. 0 steel box girder 3 into place, ensuring good connection between it and the supporting structure.

[0044] Step 11: Fabrication of the assembled steel box girder 4: Due to the large span of the assembled steel box girder 4, it cannot be hoisted in one go. Therefore, the connection and fabrication of the assembled steel box girder 4 need to be carried out with the support of the existing piles 5 and the existing bridge deck 6.

[0045] Step 12: Lifting the assembled steel box girder 4: The assembled steel box girder 4 is connected by the first lifting rod 13 and the second lifting rod 26, and lifted by a winch to the top surface of the first support beam 9 and the second support beam 23 to ensure the safe position of the steel box girder.

[0046] Step 13: Steel Box Girder Connection and Fixing: Connect the assembled steel box girder 4 with the No. 0 steel box girder 3 to ensure the structural stability between the two, and complete the fabrication and installation of the large-span steel box girder.

[0047] Example 2

[0048] As another embodiment, this embodiment two is proposed based on embodiment one. The method uses a large-span, large-section steel box girder construction system, including piers 1, cap beams 2, existing piles 5, existing bridge decks 6, No. 0 steel box girder 3, and assembled steel box girder 4. Piers 1 and existing piles 5 are respectively located on both sides, and existing bridge decks 6 are installed on existing piles 5.

[0049] like Figures 1 to 3 As shown, the temporary pier 1 is constructed with two parallel first temporary piles 7. There is a connector 10 between the temporary pier 1 and the first temporary piles 7. The first temporary piles 7 have a first square column 8. The upper parts of the two first temporary piles 7 are connected by a first support beam 9. The first square column 8 has a lifting system, which includes a first lifting rod 13, a first lifting component 12, and a first lifting groove 11. The first lifting component 12 is embedded in the first lifting groove 11. The first lifting component 12 is connected to the first lifting rod 13. The first lifting component 12 can drive the first lifting rod 13 to slide up and down in the first lifting groove 11.

[0050] On the other side, a second temporary pile 14 is constructed adjacent to the existing pile 5. The second temporary pile 14 is connected to the existing bridge deck 6 by a transverse connecting rod 21. The second temporary pile 14 has a second square column 15, and the second square column 15 also has a lifting system. The lifting system includes a second lifting rod 26, a second lifting component 27, and a second lifting groove 16.

[0051] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 1 can be referred to each other, and will not be repeated in this application.

[0052] Example 3

[0053] As another embodiment, this third embodiment proposes a more specific construction system for large-span, large-section steel box girders based on embodiments one and two:

[0054] Two parallel fixed bases 17 are installed on the existing bridge deck 6. The fixing bolts 18 install the third temporary pile 19 on the fixed base 17. The third temporary pile 19 has a third square column 20, and the top of the third square column 20 has a second support beam 23. At the same time, the middle of the two third square columns 20 is connected by a horizontal beam 22, and the third square column 20 is connected to the adjacent second square column 15 by a side beam 24. The second square column 15 has a lifting system, which includes a second lifting rod 26, a second lifting component 27, and a second lifting groove 16.

[0055] like Figure 4 and Figure 5 As shown, in actual operation, the existing bridge deck 6 is used as a construction platform to hoist the No. 0 steel box girder 3 into place. Due to the large span of the assembled steel box girder 4, it is impossible to hoist it into place in one go. Therefore, the existing piles 5, the existing bridge deck 6, and the newly built temporary supports are used as a temporary construction system. The existing bridge deck 6 is used to connect and fabricate the assembled steel box girder 4. Then, the first lifting rod 13 and the second lifting rod 26 are used to connect the assembled steel box girder 4, and a winch is used as power to lift the assembled steel box girder 4 to the top surface of the first support beam 9 and the second support beam 23. The assembled steel box girder 4 is connected with the No. 0 steel box girder 3 to form the positioned steel box girder 25, thereby realizing the fabrication and installation of the large-span steel box girder.

[0056] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiments 1 and 2 can be referred to each other, and will not be repeated in this application.

[0057] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

Claims

1. A construction method for large-span, large-section steel box girders, characterized in that, Includes the following steps: Step 1: The first temporary pile is arranged on the pier column, and the first square column is installed on the first temporary pile; the upper parts of the two first temporary piles are connected by the first support beam; a lifting system is installed on the first square column; the construction of the pier column involves two parallel first temporary piles, and a connector is provided between the pier column and the first temporary pile; the first square column has a lifting system, which includes a first lifting rod, a first lifting component, and a first lifting groove; the first lifting groove is set along the height direction of the first square column, the first lifting component is embedded in the first lifting groove, the first lifting component is connected to the first lifting rod, the first lifting rod is fixed to the assembled steel box girder, and the first lifting component can drive the first lifting rod to slide up and down in the first lifting groove; Step 2: The second temporary pile is connected to the existing bridge deck by a transverse connecting rod, and a second square column is installed above the second temporary pile; a lifting system is installed on the second square column. Step 3: Install a third temporary pile on the existing bridge deck, and install a third triangular column on the third temporary pile. The tops of the two third triangular columns are connected by a second support beam. Step 4: Using the existing bridge deck as a construction platform, hoist the No. 0 steel box girder onto the cap beam of the pier column; Step 5: Assemble the steel box girder; use the lifting system to lift the assembled steel box girder to the top surface of the first and second support beams; connect the assembled steel box girder to the No. 0 steel box girder.

2. The construction method for large-span, large-section steel box girders according to claim 1, characterized in that, In step two, a second temporary pile is constructed to connect the existing piles. The second temporary pile is connected to the existing bridge deck by a transverse connecting rod. The second temporary pile has a second square column, which also has a lifting system. The lifting system includes a second lifting rod, a second lifting component, and a second lifting groove. The second lifting groove is located on the second square column, and the second lifting component is embedded in the second lifting groove. The second lifting component and the second lifting rod are fixed together, and the second lifting rod is fixed to the assembled steel box girder.

3. The construction method for large-span, large-section steel box girders according to claim 1, characterized in that, In step three, two parallel fixed bases are installed on the existing bridge deck. The fixing bolts install the third temporary pile on the fixed base, and the third temporary pile has a third triangular column.

4. The construction method for large-span, large-section steel box girders according to claim 1, characterized in that, In step four, the existing bridge deck is used as a construction platform to hoist the No. 0 steel box girder into place, and the existing piles and existing bridge deck are used as a temporary construction system.

5. The construction method for large-span, large-section steel box girders according to claim 2, characterized in that, In step five, the first and second lifting rods are used to connect the assembled steel box girder, and a winch is used as power to lift the assembled steel box girder to the top surface of the first and second support beams.

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