Bridge-on-bridge construction method for punching holes in bridge and driving temporary support
Through the construction method of perforating temporary support on bridges in narrow spaces in the city, the problem of bridge construction in the existing technology when space is restricted is solved, efficient and safe bridge construction is achieved, and the impact on traffic is reduced.
Patent Information
- Application Number
- CN202411640046.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-18
- Publication Date
- 2025-02-28
AI Technical Summary
In the case of small spaces in the city and dense surrounding buildings, existing bridge construction methods are difficult to effectively carry out, which easily has an unpredictable impact on the original bridge structure and is difficult to ensure safety and stability during the construction process. At the same time, how to complete the construction without interrupting traffic or minimizing the impact of traffic is also a difficult problem.
The construction method of perforation on the bridge is adopted to drill temporary support. By drilling holes at the wet joints of the T-beam of the original bridge, inserting steel pipe concrete short columns, and using I-steel and Bere beams to carry out the construction of a new bridge, the original bridge is not affected by the construction load and is directly subjected to stress on the lower strip foundation.
This method can carry out construction without occupying a large area of site, reducing the closure time of the original bridge and even without the need to close the original bridge, thereby reducing the impact of construction on traffic, improving construction efficiency, and ensuring the safety and stability of the construction process.
Smart Images
Figure CN119531255A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of bridge construction, and more specifically to a method for erecting a bridge by punching holes on the bridge and installing temporary brackets. Background Art
[0002] With the acceleration of global urbanization, the development of transportation systems is changing with each passing day, and the road environment within cities has become increasingly complex and changeable. With the surge in the number of vehicles and the increase in population density, the traffic load has shown a continuous and significant growth trend. This change poses a severe challenge to urban infrastructure, especially bridge structures. Many urban bridges with a long history or whose future traffic flow was not fully estimated in the early design stage have gradually exposed the problem of insufficient carrying capacity and are unable to meet the current and future growing traffic needs.
[0003] In order to effectively ease traffic pressure, improve urban traffic efficiency, and take into account the protection and inheritance of historical culture, building new bridges or renovating and reinforcing existing bridges has become a widely recognized solution. This approach aims to cope with the growing traffic load by increasing traffic capacity or optimizing traffic structure, while minimizing the impact on urban landscape and residents' lives.
[0004] However, in actual operation, existing bridge construction methods face many challenges, especially in urban environments with limited space resources. The space inside the city is often small, the surrounding buildings are dense, and the construction area is restricted, which not only greatly restricts the entry and exit of construction equipment and the working space, but also increases the difficulty of construction and safety risks. Bridge construction or reconstruction under such conditions is very likely to cause unpredictable effects on the original bridge structure, and it is difficult to ensure its safety and stability during the construction process. In addition, how to complete the construction without interrupting traffic or minimizing the impact on traffic is also a technical problem that needs to be solved urgently in the current bridge construction field. Summary of the invention
[0005] In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides a bridge construction method for drilling holes on the bridge and installing temporary brackets. Under the condition of complex traffic conditions in the city, this construction method does not need to occupy a large area of construction, can reduce the closure time of the original bridge, and even does not need to close the original bridge, thereby reducing the impact on traffic during the construction process.
[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: A method for erecting a bridge on a bridge by punching holes on the bridge and installing a temporary support, comprising the following steps: S1. In the lower space of the original bridge, a strip foundation is used as the foundation structure of the temporary support platform for the construction of the new bridge, and micro piles are buried under the strip foundation to improve the bearing capacity and stability of the foundation and prevent the foundation from settling or tilting; S2. Build upwardly extending steel pipe columns above the strip foundation as the supporting structure of the temporary support platform for the construction of the new bridge. The height and position of the steel pipe columns correspond to the T-beams of the original bridge. S3. Use professional drilling equipment to drill circular holes at the wet joints of the T-beam wing plates of the original bridge. The number and position of the holes should be consistent with the number and position of the steel pipe columns to facilitate subsequent insertion work. S4. A short column is connected to the top of the steel tube column. The short column is a steel tube concrete short column. The steel tube concrete short column is used as the supporting structure of the temporary support platform for the construction of the new bridge. The diameter of the steel tube concrete short column is smaller than the diameter of the hole, which is convenient for inserting it into the hole at the T-beam wing plate and fixing it above the bridge deck height of the original bridge to form a supporting system. S5. On the basis of the steel tube concrete short columns, I-beams are arranged horizontally as the structure that directly bears the subsequent Bailey beam gravity load and the load generated by the bridge construction. Bailey beams are arranged longitudinally above the I-beams as a support platform for the temporary construction of the new bridge. The width and thickness of the Bailey beams are adapted to the bridge deck of the new bridge to facilitate the subsequent bridge construction work.
[0007] In step S3, a drilling rig is used to drill a hole to a designed depth, and the hole is finalized after confirmation by a site engineer.
[0008] Firstly, the old bridge after the opening was analyzed, and a model was established. The deadweight, the second phase, the single lane, and the crowd load were applied, and the conditions with the opening radius of 0, 5, 10, 15, 20, and 25 cm were established for Ansys parametric modeling analysis. The steel tube concrete columns that pass through the old bridge to support the new bridge were analyzed. The load of the new bridge superstructure was transferred to the steel tube concrete columns through the Bailey beam. The load of the superstructure was distributed to each steel tube concrete column. One steel tube concrete column was analyzed, and the working conditions of steel tube column radius of 5, 10, 15, 20, and 25 cm were established respectively for Ansys parametric modeling analysis to ensure the stability of the steel column; The obtained steel column data is input into Origin for polynomial fitting, and the formula is as follows: y=b+B1*x+B2*x 2 +B3*x 3 Where x is the radius of the steel column and y is the eigenvalue buckling load multiplier b=0.1022±2.10436 B1=-0.017±0.55014 B2=-0.00171±0.04084 B3=0.0013±9.01823E-4; After data analysis, the hole size that meets both the stability requirements of the steel column and the bearing capacity of the old bridge is determined. The size of the hole in the old bridge can be determined by the radius x.
[0009] In step S5, the corresponding strength of the selected I-beam is ensured to match the length and position of the I-beam with the span of the original bridge, so as to facilitate the subsequent laying work.
[0010] In the step S1, when the bottom rock layer is hard and difficult to drill, a pipe drill is used to drill a hole, and a grouting process is performed after drilling. After the micro pile is inserted, a grouting pipe is inserted immediately for grouting. The grouting pressure is 0.1-0.5MPa, and the cement slurry uses 42.5 cement slurry with a water-cement ratio of 0.50-1.0. When the cement slurry flows out of the steel pipe again, the cement slurry is grouted twice or three times after it reaches initial setting until the steel pipe pile is filled.
[0011] In step S1, the micropile construction method adopts the direct insertion method, and the micropile is clamped by a steel sheet pile driver to press it directly vertically downward at a predetermined point position. The micropile construction accurately determines the pile position by laying out the lines; the hole position deviation shall not be greater than 20 mm; the verticality deviation of the hole shall not be greater than 1.5‰; the hole depth error shall not be greater than 100 mm, and the verticality deviation is controlled by a two-way hanging hammer method, and the theodolite is used for verification.
[0012] During the straightening and correction inspection, use a plumb bob to check from two vertical directions. If deflection is found, adjust it by adding a thin wooden block under the machine base.
[0013] Compared with the prior art, the present invention has the following beneficial effects: The method of the present invention is to drill holes at the wet joints of the T-beams of the original bridge to connect the concrete steel pipe columns, and use I-beams and Bailey beams to construct a new bridge, so that the original bridge is not affected by the load of the construction, and is directly stressed on the lower strip foundation, thereby ensuring the normal operation of the bridge construction under limited space and the normal use of some functions of the original bridge. It effectively improves the construction efficiency, and in the case of complex traffic conditions in the city, it does not need to occupy a large area of construction, can reduce the closure time of the original bridge, and even does not need to close the original bridge, thereby reducing the impact on traffic during the construction process. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the construction structure in the present invention; Figure 2This is a comparative simulation diagram of the original bridge without holes; Figure 3 This is a schematic diagram of the simulation of the deformation degree of the bridge deck when it is loaded after the wet joint position of the T-beam of the original bridge is punched; Figure 4 It is a schematic diagram of the Ansys fitting curve of the load multiplier with respect to the radius of the steel pipe column; Figure 5 This is a schematic diagram of the Ansys model of the new bridge completed on the original bridge; Figure 6 This is a schematic diagram of the construction after the original bridge support was completed; In the figure: 1 is a micro pile, 2 is a strip foundation, 3 is a steel pipe column, 4 is the original bridge, 5 is a steel tube concrete short column, 6 is an I-beam, and 7 is a Bailey beam. DETAILED DESCRIPTION
[0015] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.
[0016] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from the description. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.
[0017] like Figures 1 to 6 As shown, a method for constructing a bridge on a bridge by punching holes and installing temporary brackets on the bridge comprises the following steps: S1. In the lower space of the original bridge 4, a strip foundation 2 is used as the foundation structure of the temporary support platform for the construction of the new bridge, and micro piles 1 are buried under the strip foundation 2 to improve the bearing capacity and stability of the foundation and prevent the foundation from settling or tilting; S2. Build a steel pipe column 3 extending upward above the strip foundation 2 as a supporting structure for the temporary support platform for the construction of the new bridge. The height and position of the steel pipe column 3 correspond to the T-beam of the original bridge 4. S3. Use professional drilling equipment to drill circular holes at the wet joint position of the T-beam wing plate of the original bridge 4. The number and position of the holes are consistent with the number and position of the steel pipe columns 3 to facilitate subsequent insertion work; S4, a short column is externally connected above the steel tube column 3. The short column adopts a steel tube concrete short column. The steel tube concrete short column serves as the supporting structure of the support platform for the temporary construction of the new bridge. The diameter of the steel tube concrete short column 5 is smaller than the diameter of the hole, which is convenient for inserting it into the hole at the T-beam wing plate and fixing it above the bridge deck height of the original bridge 4 to form a supporting system; S5. On the basis of the steel tube concrete short column 5, an I-beam 6 is arranged horizontally as a structure that directly bears the gravity load of the subsequent Bailey beam 7 and the load generated by the bridge construction. The Bailey beam 7 is arranged longitudinally above the I-beam 6 as a supporting platform for the temporary construction of the new bridge. The width and thickness of the Bailey beam 7 are adapted to the bridge deck of the newly built bridge to facilitate the subsequent bridge construction work.
[0018] Preferably, in step S3, a drilling rig is used to drill a hole to a designed depth, and the hole is finalized after confirmation by a site engineer.
[0019] Firstly, the old bridge after the opening was analyzed, and a model was established. The deadweight, the second phase, the single lane, and the crowd load were applied, and the conditions with the opening radius of 0, 5, 10, 15, 20, and 25 cm were established for Ansys parametric modeling analysis. The steel tube concrete column that passes through the old bridge to support the new bridge is analyzed. The load of the new bridge superstructure is transferred to the steel tube concrete column through Bailey beam 7. The load of the superstructure is distributed to each steel tube concrete column. One steel tube concrete column is analyzed, and the working conditions of steel tube column 3 with radius of 5, 10, 15, 20, and 25 cm are established respectively. Ansys parametric modeling analysis is performed to ensure the stability of the steel column; The obtained steel column data is input into Origin for polynomial fitting, and the formula is as follows: y=b+B1*x+B2*x 2 +B3*x 3 Where x is the radius of the steel column and y is the eigenvalue buckling load multiplier b=0.1022±2.10436 B1=-0.017±0.55014 B2=-0.00171±0.04084 B3=0.0013±9.01823E-4; After data analysis, the hole size that meets both the stability requirements of the steel column and the bearing capacity of the old bridge is determined. The size of the hole in the old bridge can be determined by the radius x.
[0020] Preferably, in step S5, the corresponding strength of the selected I-beam 6 ensures that the length and position of the I-beam 6 match the span of the original bridge 4 to facilitate subsequent paving work.
[0021] Preferably, in step S1, when the bottom rock layer is hard and difficult to drill, a pipe drill is used to drill a hole, and a grouting process is performed after the hole is drilled. After the micro pile 1 is inserted, a grouting pipe is immediately inserted for grouting. The grouting pressure is 0.1-0.5MPa, and the cement slurry uses 42.5 cement slurry with a water-cement ratio of 0.50-1.0. The cement slurry flows out of the steel pipe again. After the cement slurry reaches initial setting, it is grouted twice or three times until the steel pipe pile is filled.
[0022] Preferably, in step S1, the micropile 1 construction method adopts the direct insertion method, and the micropile 1 is clamped by a steel sheet pile driver and directly pressed vertically downward at a predetermined point position. The micropile 1 construction accurately determines the pile position by laying out the lines; the hole position deviation shall not be greater than 20 mm; the verticality deviation of the hole shall not be greater than 1.5‰; the hole depth error shall not be greater than 100 mm, and the verticality deviation is controlled by a two-way hanging hammer method, and the theodolite is used for verification.
[0023] During the straightening and correction inspection, use a plumb bob to check from two vertical directions. If deflection is found, adjust it by adding a thin wooden block under the machine base.
[0024] Only the preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention, and various changes should be included in the protection scope of the present invention.
Claims
1. A bridge construction method for perforating a bridge and placing a temporary support, characterized in that: The following steps are involved: S1. In the lower space of the original bridge, a strip foundation is used as the foundation structure of the temporary support platform for the construction of the new bridge, and micro piles are buried under the strip foundation to improve the bearing capacity and stability of the foundation and prevent the foundation from settling or tilting; S2. Build upwardly extending steel pipe columns above the strip foundation as the supporting structure of the temporary support platform for the construction of the new bridge. The height and position of the steel pipe columns correspond to the T-beams of the original bridge. S3. Use professional drilling equipment to drill circular holes at the wet joints of the T-beam wing plates of the original bridge. The number and position of the holes should be consistent with the number and position of the steel pipe columns to facilitate subsequent insertion work. S4. A short column is connected to the top of the steel tube column. The short column is a steel tube concrete short column. The steel tube concrete short column is used as the supporting structure of the temporary support platform for the construction of the new bridge. The diameter of the steel tube concrete short column is smaller than the diameter of the hole, which is convenient for inserting it into the hole at the T-beam wing plate and fixing it above the bridge deck height of the original bridge to form a supporting system. S5. On the basis of the steel tube concrete short columns, I-beams are arranged horizontally as the structure that directly bears the subsequent Bailey beam gravity load and the load generated by the bridge construction. Bailey beams are arranged longitudinally above the I-beams as a support platform for the temporary construction of the new bridge. The width and thickness of the Bailey beams are adapted to the bridge deck of the new bridge to facilitate the subsequent bridge construction work.
2. The method for constructing a bridge by punching holes and placing temporary supports on the bridge according to claim 1, characterized in that: In step S3, a drilling rig is used to drill a hole to a designed depth, and the hole is finalized after confirmation by a site engineer.
3. The method for constructing a bridge by punching holes and placing temporary supports on the bridge according to claim 2, characterized in that: Firstly, the old bridge after the opening was analyzed, and a model was established. The deadweight, the second phase, the single lane, and the crowd load were applied, and the conditions with the opening radius of 0, 5, 10, 15, 20, and 25 cm were established for Ansys parametric modeling analysis. The steel tube concrete columns that pass through the old bridge to support the new bridge were analyzed. The load of the new bridge superstructure was transferred to the steel tube concrete columns through the Bailey beam. The load of the superstructure was distributed to each steel tube concrete column. One steel tube concrete column was analyzed, and the working conditions of steel tube column radius of 5, 10, 15, 20, and 25 cm were established respectively for Ansys parametric modeling analysis to ensure the stability of the steel column; The obtained steel column data is input into Origin for polynomial fitting, and the formula is as follows: y=b+B1*x+B2*x 2 +B3*x 3 Where x is the radius of the steel column and y is the eigenvalue buckling load multiplier b=0.1022±2.10436 B1=-0.017±0.55014 B2=-0.00171±0.04084 B3=0.0013±9.01823E-4; After data analysis, the hole size that meets both the stability requirements of the steel column and the bearing capacity of the old bridge is determined. The size of the hole in the old bridge can be determined by the radius x.
4. The method for erecting a bridge by punching holes and placing temporary supports on the bridge according to claim 1, characterized in that: In step S5, the corresponding strength of the selected I-beam is ensured to match the length and position of the I-beam with the span of the original bridge, so as to facilitate the subsequent laying work.
5. The method for erecting a bridge by punching holes and placing temporary supports on the bridge according to claim 1, characterized in that: In the step S1, when the bottom rock layer is hard and difficult to drill, a pipe drill is used to drill a hole, and a grouting process is performed after drilling. After the micro pile is inserted, a grouting pipe is inserted immediately for grouting. The grouting pressure is 0.1-0.5MPa, and the cement slurry uses 42.5 cement slurry with a water-cement ratio of 0.50-1.
0. When the cement slurry flows out of the steel pipe again, the cement slurry is grouted twice or three times after it reaches initial setting until the steel pipe pile is filled.
6. The method for erecting a bridge by drilling holes and placing temporary supports on the bridge according to claim 1, characterized in that: In step S1, the micropile construction method adopts the direct insertion method, and the micropile is clamped by a steel sheet pile driver to press it directly vertically downward at a predetermined point position. The micropile construction accurately determines the pile position by laying out the lines; the hole position deviation shall not be greater than 20 mm; the verticality deviation of the hole shall not be greater than 1.5‰; the hole depth error shall not be greater than 100 mm, and the verticality deviation is controlled by a two-way hanging hammer method, and the theodolite is used for verification.
7. A bridge erection construction method for a bridge with a temporary support by punching holes on the bridge according to strong requirement 6, characterized in that: During the straightening and correction inspection, use a plumb bob to check from two vertical directions. If deflection is found, adjust it by adding a thin wooden block under the machine base.