Construction method of large-span large-section steel box girder

Abstract

The invention relates to a construction method of a large-span large-section steel box girder, which is characterized in that temporary piles are combined with square columns to form an effective temporary support structure, so that the stability of the steel box girder in the construction process is ensured, and the potential safety hazard of construction is reduced; the lifting system is provided with a lifting rod, so that the efficient hoisting and positioning of the steel box girder can be realized, the spliced steel box girder can be smoothly lifted under the large-span condition through the design, and the smooth construction is ensured; the existing bridge plate is adopted as a construction platform, and the temporary support and the fixed base are combined, so that the construction steps are simplified, and the construction efficiency is improved; by ensuring the reliable connection between the No.0 steel box girder and the assembled steel box girder, the stability and the bearing capacity of the whole structure are optimized, so that the engineering quality of the whole bridge is improved, and the service life of the whole bridge is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge engineering and its construction, and in particular relates to a construction method of a large-span and large-section steel box girder. Background Art

[0002] With the increasing demand for transportation, long-span bridges are playing an increasingly important role in modern infrastructure construction. Such bridges have the advantages of strong bearing capacity, large span and long service life, which can effectively improve traffic flow and promote regional economic development. However, traditional bridge construction methods often have problems such as high construction difficulty, long construction period and safety hazards when facing large-span and 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 have good bending and torsion resistance, but can also effectively reduce their own weight and reduce the load on the lower structure. At the same time, 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 a complex temporary support system to ensure their stability and safety during the construction process.

[0004] At present, many construction plans use auxiliary structures such as temporary piles and support beams, but in the specific implementation, they still face a series of problems such as the design, construction and subsequent removal of the support system. These problems not only affect the construction efficiency, but may also lead to engineering quality and safety hazards. Therefore, a more scientific, reasonable and efficient construction method is urgently needed to solve the technical difficulties in the construction of large-span and large-section steel box girders. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a construction method for a large-span and large-section steel box girder.

[0006] This large-span and large-section steel box girder construction method comprises the following steps:

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

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

[0009] Step 3: setting a third temporary pile on the existing bridge deck, installing a third rectangular column on the third temporary pile, and connecting the tops of two third rectangular columns through a second support beam;

[0010] Step 4: Use the existing bridge deck as a construction platform to 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 support beam and the second support beam; connect the assembled steel box girder with the No. 0 steel box girder.

[0012] Preferably, in step one, the temporary pier column is constructed with two first temporary piles arranged in parallel, and a connecting piece is provided between the temporary pier column and the first temporary piles.

[0013] Preferably, in step one, the first square column is provided with a lifting system, the lifting system comprising a first lifting rod, a first lifting member and a first lifting groove; the first lifting groove is arranged along the height direction of the first square column, the first lifting member is embedded and installed in the first lifting groove, the first lifting member is connected to the first lifting rod, the first lifting rod is fixed to the assembled steel box girder, and the first lifting member can drive the first lifting rod to slide up and down in the first lifting groove.

[0014] Preferably, in step two, a second temporary pile is constructed adjacent to the existing pile, the second temporary pile is connected to the existing bridge deck by a transverse connecting rod, the second temporary pile is provided with a second square column, the second square column is also provided with a lifting system, the lifting system comprises a second lifting rod, a second lifting member and a second lifting groove, the second lifting groove is provided on the second square column, the second lifting member is embedded in the second lifting groove, the second lifting member is fixed to the second lifting rod, and the second lifting rod is fixed to the assembled steel box girder.

[0015] Preferably, in step three, two fixed bases arranged in parallel are installed on the existing bridge deck, and the third temporary pile is installed on the fixed base by fixing bolts, and the third temporary pile has a third triangular column.

[0016] Preferably, 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 the existing bridge deck are used as a temporary construction system.

[0017] Preferably, in step five, the assembled steel box girder is connected by the first lifting rod and the second lifting rod, and a winch is used as a power to lift the assembled steel box girder to the top surface of the first support beam and the second support beam.

[0018] A large-span and large-section steel box girder is obtained by any of the above-mentioned methods.

[0019] The beneficial effects of the present invention are:

[0020] 1) The present invention uses temporary piles in combination with square columns to form an effective temporary support structure, ensuring the stability of the steel box girder during the construction process, thereby reducing construction safety hazards.

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

[0022] 3) The present invention uses the existing bridge deck as a construction platform, combined with the installation of temporary supports and fixed bases, simplifies the construction steps and improves the construction efficiency.

[0023] 4) The present invention optimizes the stability and bearing capacity of the overall structure by ensuring the reliable connection between the No. 0 steel box girder and the assembled steel box girder, thereby improving the engineering quality and service life of the entire bridge.

[0024] 5) The present invention realizes the combination of the assembly platform and the lifting platform, which is not only suitable for the construction of large-span steel box girders, but also can be flexibly applied to other types of bridges. It has good adaptability and scalability and can meet the needs of different projects. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Figure 2 This is the left view of the construction system of the large-span and large-section steel box girder;

[0027] Figure 3 This is the front view of the construction system of the large-span and large-section steel box girder;

[0028] Figure 4 This is a schematic diagram of the large-span and large-section steel box girder after installation;

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

[0030] Explanation of the reference numerals in the accompanying drawings: 1. pier; 2. cap beam; 3. No. 0 steel box girder; 4. assembled steel box girder; 5. existing piles; 6. existing bridge deck; 7. first temporary piles; 8. first square column; 9. first support beam; 10. connecting piece; 11. first lifting groove; 12. first lifting piece; 13. first lifting rod; 14. second temporary pile; 15. second square column; 16. second lifting groove; 17. fixed base; 18. fixing bolt; 19. third temporary pile; 20. third square column; 21. transverse connecting rod; 22. flat beam; 23. second support beam; 24. side beam; 25. in-place steel box girder; 26. second lifting rod; 27. second lifting piece. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0032] Embodiment 1

[0033] As an embodiment, the construction method of the large-span and large-section steel box girder comprises the following steps:

[0034] Step 1: Arrangement of temporary piles: Arrange two parallel first temporary piles 7 on the pier column 1, and construct connecting pieces 10 between the pier column 1 and the first temporary piles 7 to ensure their verticality and stability, thus providing 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 basis for 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 through the first support beam 9 to form a stable support structure to provide support for the lifting system.

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

[0038] Step 5: Construction of temporary piles 5: Install a 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 a transverse connecting rod 21, and a second square column 15 is installed above it to ensure the stability and support capacity of the structure.

[0039] Step 6: Installation of the lifting system of the second square column 15: The lifting system is also installed on the second square column 15, including the second lifting rod 26, the second lifting member 27 and the second lifting groove 16, to provide support for the lifting of the assembled steel box girder 4. The second lifting groove 16 is provided on the second square column 15, the second lifting member 27 is embedded in the second lifting groove 16, the second lifting member 27 and the second lifting rod 26 are fixed, and the second lifting rod 26 and the assembled steel box girder 4 are fixed.

[0040] Step 7, installation of the third temporary pile 19: a fixed base 17 arranged in parallel is provided on the existing bridge deck 6, and the third temporary pile 19 is installed on the fixed base 17 by using fixing bolts 18 to enhance the stability of the structure.

[0041] Step 8, connection of the second support beam 23: connect the tops of the two third-party rectangular columns 20 through the second support beam 23, and install a flat cross beam 22 in the middle of the third-party rectangular column 20 to further enhance the stability of the overall support frame.

[0042] Step nine, cross beam connection: connect the third square column 20 with the adjacent second square column 15 through the side cross beam 24 to form a complete support system.

[0043] Step 10, hoisting of steel box girder No. 0 3: using the existing bridge deck 6 as a construction platform, hoist the steel box girder No. 0 3 into place, ensuring that it is well connected with the supporting structure.

[0044] Step 11, production of assembled steel box girder 4: As the span of assembled steel box girder 4 is relatively large, it cannot be hoisted at one time, so it is necessary to carry out connection production of assembled steel box girder 4 with the support of existing piles 5 and existing bridge deck 6.

[0045] Step 12, lifting of assembled steel box girder 4: connect the assembled steel box girder 4 through the first lifting rod 13 and the second lifting rod 26, and use a winch to lift it 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: Connect and fix the steel box girder: 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 production and installation of the large-span steel box girder.

[0047] Embodiment 2

[0048] As another embodiment, this embodiment 2 is proposed on the basis of the embodiment 1, and the large-span and large-section steel box girder construction system used in this method includes a pier column 1, a cap beam 2, an existing pile 5, an existing bridge deck 6, a No. 0 steel box girder 3, and an assembled steel box girder 4. The pier column 1 and the existing pile 5 are respectively arranged on both sides, and the existing bridge deck 6 is arranged on the existing pile 5.

[0049] like Figures 1 to 3 As shown, the temporary pier column 1 is constructed with two first temporary piles 7 arranged in parallel, a connecting member 10 is provided between the temporary pier column 1 and the first temporary pile 7, a first square column 8 is provided on the first temporary pile 7, the upper parts of the two first temporary piles 7 are connected by a first supporting beam 9, a lifting system is provided on the first square column 8, the lifting system includes a first lifting rod 13, a first lifting member 12, and a first lifting groove 11; the first lifting member 12 is embedded and installed in the first lifting groove 11, the first lifting member 12 is connected to the first lifting rod 13, and the first lifting member 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 through a transverse connecting rod 21. The second temporary pile 14 has a second square column 15. The second square column 15 also has a lifting system, which includes a second lifting rod 26, a second lifting member 27, and a second lifting groove 16.

[0051] It should be noted that the parts in this embodiment that are the same or similar to those in the first embodiment can be referenced to each other and will not be described in detail in this application.

[0052] Embodiment 3

[0053] As another embodiment, this embodiment 3 proposes a more specific large-span and large-section steel box girder construction system based on the first and second embodiments:

[0054] Two parallel fixed bases 17 are installed on the existing bridge deck 6, and the third temporary pile 19 is installed on the fixed base 17 by fixing bolts 18. The third temporary pile 19 is provided with a third square column 20, and the top of the third square column 20 is provided with a second support beam 23; at the same time, the middle parts of the two third square columns 20 are connected by a flat cross beam 22, and the third square column 20 is connected to the adjacent second square column 15 by a side cross beam 24; the second square column 15 is provided with a lifting system, and the lifting system includes a second lifting rod 26, a second lifting member 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. Since the assembled steel box girder 4 has a large span and cannot be hoisted into place at one time, the existing piles 5, the existing bridge deck 6 and the above-mentioned newly built temporary supports are used as a temporary construction system. The existing bridge deck 6 is used to connect and manufacture the assembled steel box girder 4, and then the first lifting rod 13 and the second lifting rod 26 are used to connect the assembled steel box girder 4, and the winch is used as the 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, and the assembled steel box girder 4 is connected to the No. 0 steel box girder 3 to form an in-place steel box girder 25, thereby realizing the production and installation of large-span steel box girders.

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

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

Claims

1. A method for constructing a large-span and large-section steel box girder, characterized in that it comprises the following steps: Step 1: Arrange a first temporary pile on the temporary pier column, and install a first square column on the first temporary pile; connect the upper parts of the two first temporary piles through a first support beam; and install a lifting system on the first square column; Step 2: The second temporary pile is connected to the existing bridge deck through a transverse connecting rod, and a second square column is installed above the second temporary pile; and a lifting system is installed on the second square column; Step 3: setting a third temporary pile on the existing bridge deck, installing a third rectangular column on the third temporary pile, and connecting the tops of two third rectangular columns through a second support beam; Step 4: Use the existing bridge deck as a construction platform to 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 support beam and the second support beam; connect the assembled steel box girder with the No. 0 steel box girder.

2. The method for constructing a large-span and large-section steel box girder according to claim 1, characterized in that: In step one, the temporary pier column is constructed with two first temporary piles arranged in parallel, and a connecting piece is provided between the temporary pier column and the first temporary piles.

3. The method for constructing a large-span and large-section steel box girder according to claim 1, characterized in that: In step one, a lifting system is provided on the first square column, and the lifting system includes a first lifting rod, a first lifting member and a first lifting groove; the first lifting groove is arranged along the height direction of the first square column, and the first lifting member is embedded and installed in the first lifting groove, and the first lifting member is connected to the first lifting rod, and the first lifting rod is fixed to the assembled steel box girder, and the first lifting member can drive the first lifting rod to slide up and down in the first lifting groove.

4. The method for constructing a large-span and large-section steel box girder according to claim 3, characterized in that: In step two, a second temporary pile is constructed near the existing pile. The second temporary pile is connected to the existing bridge deck through a transverse connecting rod. The second temporary pile is provided with a second square column. The second square column is also provided with a lifting system. The lifting system includes a second lifting rod, a second lifting member and a second lifting groove. The second lifting groove is provided on the second square column. The second lifting member is embedded in the second lifting groove. The second lifting member is fixed to the second lifting rod, and the second lifting rod is fixed to the assembled steel box girder.

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

6. The method for constructing a large-span and large-section steel box girder according to claim 1, characterized in that: In step 4, 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.

7. The method for constructing a large-span and large-section steel box girder according to claim 4, characterized in that: In step five, the assembled steel box girder is connected by using the first lifting rod and the second lifting rod, and the assembled steel box girder is lifted to the top surface of the first support beam and the second support beam by using a winch as a power. 8.Long-span and large-section steel box girder, characterized in that: Obtained by the method according to any one of claims 1 to 7.

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