Deepwater complex geologic degree flood trestle structure and construction method

Abstract

The invention discloses a deep water complex geology degree flood trestle structure and a construction method, a group of trestle pile foundations are arranged on a degree flood trestle every 15-18m in the bridge direction, each group of trestle pile foundations is composed of a row of anchor pile steel pipe piles and a row of auxiliary steel pipe piles, and distribution beams are arranged at the top ends of the anchor pile steel pipe piles and the tops of the auxiliary steel pipe piles. The bailey beams are erected on the distribution beams, and the steel bridge deck is arranged on the bailey beams. According to the construction method, the trestle is pulled through in advance before the flood season arrives, auxiliary steel pipe piles need to be arranged on the large-mileage sides of anchor pile steel pipe piles of the trestle during construction, and the safety of the trestle in the using period and the drilling pile construction period is guaranteed. And the trestle can be put into use after being pulled through, and the bottom drilling piles are constructed by using the trestle anchor pile steel pipe piles as pile casings before the flood season comes, so that the construction of all the trestle drilling piles is completed, and the safety of the trestle during the flood season is ensured. The problems that the deepwater complex geology degree flood trestle is long in construction period, late in use, unstable in the construction process and the like can be effectively solved.

Description

Technical Field

[0001] The invention relates to the field of bridge construction, and in particular to a deep-water complex geological flood trestle structure and a construction method. Background Art

[0002] As a kind of transportation channel for water bridge construction, the trestle has been widely used in water construction. As the most important and difficult part of the trestle, the foundation construction often brings huge technical difficulties to the trestle construction due to geological reasons, especially in deep water complex geology, such as shallow cover geology, pebble geology and bare rock geology. The steel pipe pile foundation is difficult to insert to the design elevation, and thus cannot meet the requirements of resisting the lateral water flow impact of floods on the trestle during the flood season. It is necessary to use anchor piles to anchor the steel pipe piles in the rock layer. The traditional trestle adopts the "fishing method" anchor pile construction period. It is long, which affects the commissioning of the trestle. If the trestle construction is not completed before the flood season, it will increase the difficulty of construction, causing the progress to lag and affect the construction period. Summary of the invention

[0003] The first purpose of the present invention is to provide a deep-water complex geological flood-proof trestle structure, which can enhance the stability of the trestle under complex geological conditions and solve the problems of instability of the trestle during construction and resistance to flood erosion during the flood season.

[0004] The second purpose of the present invention is to provide a construction method for a deep-water complex geological flood trestle structure, which can effectively solve the problems of long construction period, late commissioning and slow effectiveness of deep-water complex geological flood trestle.

[0005] The first object of the present invention is achieved by: A deep-water complex geological flood crossing trestle structure, characterized in that: a group of trestle pile foundations are arranged every 15-18m along the bridge direction of the flood crossing trestle, each group of trestle pile foundations consists of a row of anchor steel pipe piles and a row of auxiliary steel pipe piles, the auxiliary steel pipe piles are arranged on the large mileage side of the anchor steel pipe piles, and bored piles are arranged at the bottom of each anchor steel pipe pile. Adjacent anchor steel pipe piles, adjacent auxiliary steel pipe piles, and anchor steel pipe piles and auxiliary steel pipe piles in each group of trestle pile foundations are welded into a whole by a connection system, and a bull weld is welded at the large and small mileage sides of the top pile head of the anchor steel pipe pile. An anchor steel pipe pile distribution beam is arranged on the corbel at the large and small mileage sides of a row of anchor steel pipe piles in the transverse direction of the bridge, and an auxiliary steel pipe pile distribution beam is arranged on the top of a row of auxiliary steel pipe piles in the transverse direction of the bridge, and the upper surface of the anchor steel pipe pile distribution beam is flush with the upper surface of the auxiliary steel pipe pile distribution beam; the Bailey beam is erected on the anchor steel pipe pile distribution beam and the auxiliary steel pipe pile distribution beam along the longitudinal direction of the bridge, and the steel bridge deck is arranged on the Bailey beam; a railing is arranged on each side of the steel bridge deck in the longitudinal direction of the bridge, and the railings on both sides stand on the edge of the steel bridge deck and are welded to the steel bridge deck.

[0006] The spacing between a row of anchor steel pipe piles and a row of auxiliary steel pipe piles in the longitudinal direction of the bridge is 3.75m, the spacing between two anchor steel pipe piles in the transverse direction of the bridge is 10m, and the spacing between two auxiliary steel pipe piles in the transverse direction of the bridge is 5m. The anchor steel pipe piles are made of φ1000×12 steel pipes, and the auxiliary steel pipe piles are made of φ800×10 steel pipes.

[0007] The penetration depth of bored piles into rock shall not be less than 2.5m, and the concrete filled in the anchor steel pipe pile shall not be less than 4m.

[0008] The second object of the present invention is achieved by: A construction method for a deep-water complex geological flood trestle structure is divided into two construction stages, including the following steps: Phase 1: Pulling the trestle bridge A. Construction of abutments at both ends of the trestle; B. Use crawler crane and pile hammer to drive anchor steel pipe piles and auxiliary steel pipe piles. The auxiliary steel pipe piles are set on the large mileage side of the anchor steel pipe piles. When driving, first use a vibrating hammer to adjust the driving position. When the vibrating hammer hits the anchor steel pipe piles and auxiliary steel pipe piles and they do not sink, replace the impact hammer and continue driving until the penetration meets the requirements; C. Welding connection systems between adjacent anchor steel pipe piles, between adjacent auxiliary steel pipe piles, and between anchor steel pipe piles and auxiliary steel pipe piles; D. Weld the pile heads on the tops of the anchor steel pipe piles and auxiliary steel pipe piles, and weld the brackets on the large and small mileage sides of the pile heads of the anchor steel pipe piles; E. An anchor steel pipe pile distribution beam is set on the corbels on the large and small mileages of a row of anchor steel pipe piles in the transverse direction of the bridge, and an auxiliary steel pipe pile distribution beam is set on the top of a row of auxiliary steel pipe piles in the transverse direction of the bridge. The upper surface of the anchor steel pipe pile distribution beam is flush with the upper surface of the auxiliary steel pipe pile distribution beam; F. Use crawler crane to hoist the assembled Bailey beam and set it on the anchor pile steel pipe pile distribution beam and auxiliary steel pipe pile distribution beam along the bridge direction; G. Laying steel bridge deck on Bailey beam; H. Repeat steps B to F, clean the trestle after it is pulled through, and use the trestle as the working site for the rotary drilling rig to prepare for the bored piles at the bottom of the anchor steel pipe piles; Phase 2: Anchoring steel pipe piles I. Use a rotary drill to drill holes. The drill rig is driven to the side of the anchor steel pipe pile, and the center of the drill bit is facing the center of the anchor steel pipe pile. The anchor steel pipe pile is used as a casing for drilling. The diameter of the bored pile is 800mm, and the depth of the bottom of the bored pile into the rock layer is not less than 2.5m; J. After drilling to the designed elevation, use flat bottom slag removal and drill bit to clean the hole; K. Make the steel cage, which is hoisted and installed by crawler crane, lowered and concrete poured; L. Railings are arranged on both sides of the trestle. The railings on both sides stand on the edge of the steel bridge deck and are welded to the steel bridge deck.

[0009] Compared with the prior art, the present invention has the following advantages: 1. In the early stage of construction, there is no need to consider the anchoring construction of anchor steel pipe piles, and the trestle can be quickly pulled through and put into use in advance; 2. Anchor steel pipe piles can be constructed during the use of the trestle and do not occupy the construction period of the trestle; 3. Consider pulling the trestle through before the flood season arrives. During construction, auxiliary steel pipe piles should be set on the long-distance side of the anchor steel pipe piles of the trestle to enhance the stability of the trestle during the construction process and the subsequent bored pile construction. The structure is safe and reliable, ensuring the safety of the trestle during the period of commissioning and bored pile construction; 4. The trestle can be put into use after it is connected. The anchor steel pipe piles are used as casings to construct the bored piles at the bottom of the anchor steel pipe piles, saving material costs. 5. The bored pile construction of all trestles can be completed before the flood season arrives to ensure the safety of the trestles during the flood season.

[0010] The present invention can effectively solve the problems of long construction period, late commissioning, slow effectiveness, instability during construction and difficulty for the trestle to resist flood erosion during the flood season in deep water with complex geological conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is the elevation view of the Duhong trestle structure; Figure 2 It is the elevation drawing of the combination of anchor steel pipe pile and auxiliary steel pipe pile; Figure 3 It is a plan view of the combination of anchor steel pipe piles and auxiliary steel pipe piles; Figure 4 This is the cross-section of the anchor steel pipe pile; Figure 5 This is the cross-sectional view of the auxiliary steel pipe pile.

[0012] In the figure: 1 is the abutment; 2 is the bored pile; 3 is the anchor steel pipe pile; 4 is the auxiliary steel pipe pile; 5 is the connection system; 6 is the corbel; 7 is the anchor steel pipe pile distribution beam; 8 is the Bailey beam; 9 is the steel bridge deck; 10 is the railing; 11 is concrete; 12 is the auxiliary steel pipe pile distribution beam; 13 is the pile head; 14 is the trestle. DETAILED DESCRIPTION

[0013] The present invention will be further described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0014] A deep-water complex geological flood crossing trestle structure, a group of trestle pile foundations are arranged every 15-18m along the bridge direction, each group of trestle pile foundations consists of a row of anchor steel pipe piles 3 and a row of auxiliary steel pipe piles 4, the auxiliary steel pipe piles 4 are arranged on the large mileage side of the anchor steel pipe piles 3, a bored pile 2 is arranged at the bottom of each anchor steel pipe pile 3, adjacent anchor steel pipe piles 3, adjacent auxiliary steel pipe piles 4, and anchor steel pipe piles 3 and auxiliary steel pipe piles 4 in each group of trestle pile foundations are welded into a whole by a connection system 5, a bracket 6 is welded at the large and small mileage sides of the top pile head 13 of the anchor steel pipe pile 3, and a hole 2 is arranged at the bottom of each anchor steel pipe pile 3. An anchor steel pipe pile distribution beam 7 is arranged on the corbel 6 at the large and small mileage sides of a row of anchor steel pipe piles 3, and an auxiliary steel pipe pile distribution beam 12 is arranged on the top of a row of auxiliary steel pipe piles 4 in the transverse direction of the bridge, and the upper surface of the anchor steel pipe pile distribution beam 7 is flush with the upper surface of the auxiliary steel pipe pile distribution beam 12; Bailey beam 8 is erected on the anchor steel pipe pile distribution beam 7 and the auxiliary steel pipe pile distribution beam 12 along the bridge direction, and a steel bridge deck 9 is arranged on the Bailey beam 8; a railing 10 is arranged on both sides of the steel bridge deck 9 in the longitudinal direction of the bridge, and the railings 10 on both sides stand on the edge of the steel bridge deck 9 and are welded to the steel bridge deck 9.

[0015] The spacing between a row of anchor steel pipe piles 3 and a row of auxiliary steel pipe piles 4 in the longitudinal direction of the bridge is 3.75m, the spacing between two anchor steel pipe piles 3 in the transverse direction of the bridge is 10m, and the spacing between two auxiliary steel pipe piles 4 in the transverse direction of the bridge is 5m. The anchor steel pipe piles 3 are made of φ1000×12 steel pipes, and the auxiliary steel pipe piles 4 are made of φ800×10 steel pipes.

[0016] The rock penetration depth of the bored pile 2 is not less than 2.5 m, and the concrete 11 filled in the anchor steel pipe pile 3 is not less than 4 m. Here, the filling depth of the concrete 11 is only the concrete depth in the anchor steel pipe pile 3, and the bored pile 2 part is not considered.

[0017] A construction method for a deep-water complex geological flood trestle structure is divided into two construction stages, including the following steps: Phase 1: Pulling the trestle bridge A. Construction of abutments 1 at both ends of the trestle 14; B. Use crawler crane and pile hammer to drive anchor steel pipe pile 3 and auxiliary steel pipe pile 4. Auxiliary steel pipe pile 4 is set on the large mileage side of anchor steel pipe pile 3. When driving, first use vibrating hammer to adjust the driving position. When the vibrating hammer hits the anchor steel pipe pile 3 and auxiliary steel pipe pile 4 and they do not sink, replace the impact hammer and continue to hammer until the penetration meets the requirements; C. Welding the connection system 5 between adjacent anchor steel pipe piles 3, between adjacent auxiliary steel pipe piles 4, and between the anchor steel pipe piles 3 and the auxiliary steel pipe piles 4; D. Weld the pile heads 13 on the tops of the anchor steel pipe pile 3 and the auxiliary steel pipe pile 4, and weld the brackets 6 on the large and small mileage sides of the pile heads 13 of the anchor steel pipe pile 3; E. An anchor steel pipe pile distribution beam 7 is arranged on the corbel 6 at the large and small mileage sides of a row of anchor steel pipe piles 3 in the transverse direction of the bridge, and an auxiliary steel pipe pile distribution beam 12 is arranged on the top of a row of auxiliary steel pipe piles 4 in the transverse direction of the bridge, and the upper surface of the anchor steel pipe pile distribution beam 7 is flush with the upper surface of the auxiliary steel pipe pile distribution beam 12; F. Use a crawler crane to hoist the assembled Bailey beam 8 and set it on the anchor pile steel pipe pile distribution beam 7 and the auxiliary steel pipe pile distribution beam 12 along the bridge direction; G. Laying a steel bridge deck 9 on the Bailey beam 8; H. Repeat steps B to F, and clean the trestle bridge 14 after it is pulled through. The trestle bridge 14 is used as the working site of the rotary drilling rig to prepare the bored pile 2 at the bottom of the anchor pile steel pipe pile 3; Phase 2: Anchoring steel pipe piles I. Use a rotary drill to drill holes. The drill rig is driven to the pile position of the anchor steel pipe pile 3, and the center of the drill bit is directly opposite to the center of the anchor steel pipe pile 3; when drilling, the anchor steel pipe pile 3 is used as a casing for drilling. The pile diameter of the bored pile 2 is 800mm, and the depth of the pile bottom of the bored pile 2 entering the rock layer is not less than 2.5m; J. After drilling to the designed elevation, use flat bottom slag removal and drill bit to clean the hole; K. Make a steel cage, lift and install the steel cage with a crawler crane, lower the steel cage, and pour concrete 11; L. Handrails 10 are arranged on both sides of the trestle 14. The handrails 10 on both sides stand on the edge of the steel bridge deck 9 and are welded to the steel bridge deck 9.

[0018] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone should be aware that any structural changes made under the inspiration of the present invention, and any technical solutions that are the same or similar to the present invention, fall within the protection scope of the present invention.

Claims

1. A deepwater complex geological flood trestle structure, characterized by: A group of trestle pile foundation is set every 15-18m along the bridge direction of Duhong Pier. Each group of trestle pile foundation consists of a row of anchor steel pipe piles and a row of auxiliary steel pipe piles. The auxiliary steel pipe piles are set on the large mileage side of the anchor steel pipe piles. A bored pile is set at the bottom of each anchor steel pipe pile. The adjacent anchor steel pipe piles, the adjacent auxiliary steel pipe piles, the anchor steel pipe piles and the auxiliary steel pipe piles in each group of trestle pile foundation are welded into a whole by a connection system. The top pile head of the anchor steel pipe pile is welded on the large and small mileage sides. An anchor steel pipe pile distribution beam is set on the corbels on the large and small mileages of the anchor steel pipe piles, and an auxiliary steel pipe pile distribution beam is set on the top of a row of auxiliary steel pipe piles in the transverse direction of the bridge. The upper surface of the anchor steel pipe pile distribution beam is flush with the upper surface of the auxiliary steel pipe pile distribution beam; the Bailey beam is erected on the anchor steel pipe pile distribution beam and the auxiliary steel pipe pile distribution beam along the longitudinal direction of the bridge, and the steel bridge deck is arranged on the Bailey beam; a railing is arranged on each side of the steel bridge deck in the longitudinal direction of the bridge, and the railings on both sides stand on the edge of the steel bridge deck and are welded to the steel bridge deck.

2. The deepwater complex geological flood trestle structure according to claim 1 is characterized by: The spacing between a row of anchor steel pipe piles and a row of auxiliary steel pipe piles in the longitudinal direction of the bridge is 3.75m, the spacing between two anchor steel pipe piles in the transverse direction of the bridge is 10m, and the spacing between two auxiliary steel pipe piles in the transverse direction of the bridge is 5m. The anchor steel pipe piles are made of φ1000×12 steel pipes, and the auxiliary steel pipe piles are made of φ800×10 steel pipes.

3. The deepwater complex geological flood trestle structure according to claim 1 is characterized by: The penetration depth of bored piles into rock shall not be less than 2.5m, and the concrete filled in the anchor steel pipe pile shall not be less than 4m.

4. A construction method for a deep-water complex geological flood trestle structure, characterized by: There are two construction phases, including the following steps: Phase 1: Pulling the trestle bridge A. Construction of abutments at both ends of the trestle; B. Use crawler crane and pile hammer to drive anchor steel pipe piles and auxiliary steel pipe piles. The auxiliary steel pipe piles are set on the large mileage side of the anchor steel pipe piles. When driving, first use a vibrating hammer to adjust the driving position. When the vibrating hammer hits the anchor steel pipe piles and auxiliary steel pipe piles and they do not sink, replace the impact hammer and continue driving until the penetration meets the requirements; C. Welding connection systems between adjacent anchor steel pipe piles, between adjacent auxiliary steel pipe piles, and between anchor steel pipe piles and auxiliary steel pipe piles; D. Weld the pile heads on the tops of the anchor steel pipe piles and auxiliary steel pipe piles, and weld the brackets on the large and small mileage sides of the pile heads of the anchor steel pipe piles; E. An anchor steel pipe pile distribution beam is set on the corbels on the large and small mileages of a row of anchor steel pipe piles in the transverse direction of the bridge, and an auxiliary steel pipe pile distribution beam is set on the top of a row of auxiliary steel pipe piles in the transverse direction of the bridge. The upper surface of the anchor steel pipe pile distribution beam is flush with the upper surface of the auxiliary steel pipe pile distribution beam; F. Use crawler crane to hoist the assembled Bailey beam and set it on the anchor pile steel pipe pile distribution beam and auxiliary steel pipe pile distribution beam along the bridge direction; G. Laying steel bridge deck on Bailey beam; H. Repeat steps B to F, clean the trestle after it is pulled through, and use the trestle as the working site for the rotary drilling rig to prepare for the bored piles at the bottom of the anchor steel pipe piles; Phase 2: Anchoring steel pipe piles I. Use a rotary drill to drill holes. The drill rig is driven to the side of the anchor steel pipe pile, and the center of the drill bit is facing the center of the anchor steel pipe pile. The anchor steel pipe pile is used as a casing for drilling. The diameter of the bored pile is 800mm, and the depth of the bottom of the bored pile into the rock layer is not less than 2.5m; J. After drilling to the designed elevation, use flat bottom slag removal and drill bit to clean the hole; K. Make the steel cage, which is hoisted and installed by crawler crane, lowered and concrete poured; L. Railings are arranged on both sides of the trestle. The railings on both sides stand on the edge of the steel bridge deck and are welded to the steel bridge deck.

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