A steel truss beam rotation construction system and method across a high-speed railway

Abstract

A system and method for the construction of a steel truss beam rotating across a high-speed railway. The system comprises a rotating system and an auxiliary slideway system. The rotating system includes a booster reaction seat, a traction reaction seat, a traction rope, a circular slideway, a rotating support, a rotating support foot, a lower pedestal, an upper pedestal, and a through-type jack. The auxiliary slideway system includes a curved foundation, running wheels, a steel truss, and a reaction seat. The system and method for the construction of a steel truss beam rotating across a high-speed railway provided by the present invention have the following beneficial effects: the construction system structure is rationally designed, safe and reliable, the construction time is short, and the application effect is significant. It effectively ensures construction safety and precision control, and provides a guidance scheme for large-span cantilever rotating steel truss beam bridges crossing high-speed railways.

Description

Technical Field

[0001] The present invention belongs to the technical field of rotation construction of steel trusses crossing high-speed railways, and in particular relates to a rotation construction system and method for steel trusses crossing high-speed railways. Background Art

[0002] Railway intersections are common during road and bridge construction. Technological advancements have led to the development of construction methods that ensure railway safety, from the initial frame-frame bridges that underpass railways to the current swing bridges that cross over them. However, existing swing bridges are mostly balanced at both ends. Due to terrain restrictions, large cantilevered steel trusses have never been used to cross high-speed railways. Summary of the Invention

[0003] In order to solve the above problems, the purpose of the present invention is to provide a steel truss beam rotation construction system and method across a high-speed railway.

[0004] In order to achieve the above-mentioned purpose, the steel truss cross-high-speed railway rotation construction system provided by the present invention includes a rotation system and an auxiliary slideway system; wherein the rotation system is arranged on the bridge rotation wall, including a booster reaction seat, a traction reaction seat, a traction rope, an annular slideway, a rotation support, a rotation support foot, a lower support platform, an upper support platform and a through-type jack; wherein the upper support platform is located above the lower support platform, and an upper turntable is provided in the middle of the bottom surface, and the upper end of the upper support platform is sequentially provided with a pier body, a pad stone and a steel truss; two inner and outer circles of booster reaction seats are concentrically provided on the top surface of the lower support platform, and the multiple booster reaction seats in each circle are spaced apart, and the booster reaction seats in the inner and outer circles are arranged correspondingly; the annular slideway is buried in the top of the lower support platform between the two circles of booster reaction seats, and ... The top surface of the annular slide is flush with the top surface of the lower supporting platform; the swivel support is located on the inner side of the inner ring booster reaction seat, and is provided with multiple anchor rods fixed to the upper turntable and the upper part of the lower supporting platform of the upper supporting platform at the top and bottom; multiple pairs of swivel legs are arranged at intervals between the upper turntable and the annular slide, the upper part of the swivel legs is embedded in the outer part of the upper turntable, and the lower end is supported on the top surface of the annular slide to play an auxiliary supporting role; two traction reaction seats are symmetrically arranged on the top surface of the lower supporting platform outside the outer ring booster reaction seat for installing through-type jacks; the embedded end of each traction rope is fixed to the inside of the upper turntable with a P-type anchor and embedded in the inner half circle of the upper turntable. The traction rope located outside the upper turntable is wrapped around the upper turntable, and the outermost end passes through a through-type jack;

[0005] The auxiliary slide system includes an arc-shaped foundation, running wheels, a steel truss and a reaction seat; wherein the arc-shaped foundation is set on the foundation behind the bridge rotating wall, and the center of the arc is located on one side of the bridge rotating wall; the two sides of the lower end of the steel truss are respectively set on the arc-shaped foundation using running wheels, and the upper end is connected to the steel truss to support the steel truss; the reaction seat is an inverted L-shaped structure, and the lower ends of multiple reaction seats are fixed at intervals on the arc-shaped foundation near the edge of one side of the bridge rotating wall.

[0006] The width of the annular slideway is 1.1m, and the lower side is a positioning bracket. A 24mm thick steel plate is installed on the upper end of the positioning bracket, and a 3mm thick stainless steel plate is installed above the steel plate.

[0007] Sixteen 45# anchor rods are respectively provided at the top and the bottom of the swivel support.

[0008] A total of eight pairs of swivel legs are arranged side by side between the upper turntable and the annular slideway. Each swivel leg includes two upper and lower leg steel pipes and a 24mm thick steel plate installed at the lower end of the leg steel pipe. C45 shrinkage compensating concrete is poured into the leg steel pipe.

[0009] Each traction rope is threaded with 31 φ15.2mm 1860MPa steel strands.

[0010] The traction reaction seat is a reinforced concrete structure with dimensions of 2.5m in length, 2m in width and 1.5m in height.

[0011] There are eight thrust-reaction seats in each circle, and they correspond one-to-one to the locations of the eight pairs of swivel legs.

[0012] The arc-shaped foundation is a reinforced concrete structure.

[0013] The steel truss is a frame structure made of steel pipes.

[0014] The construction method of the steel truss beam rotation construction system across a high-speed railway provided by the present invention comprises the following steps performed in sequence:

[0015] 1) First, the lower cap of the bridge's rotating platform is constructed. The lower cap is constructed in two steps. The first step is to construct it to the height of the bottom of the circular slideway in the rotating system to form the lower cap substructure.

[0016] 2) Installing an annular slideway on the top surface of the lower structure of the lower support platform;

[0017] 3) The second step of constructing the lower pedestal 7 is performed on the top surface of the lower pedestal substructure to form the lower pedestal superstructure. Pre-requisite holes for installing multiple anchor rods at the bottom of the swivel support are formed in the lower pedestal superstructure located inside the annular slideway until the height reaches the installation height of the top surface of the annular slideway, thereby completing the lower pedestal.

[0018] 4) Fix the multiple anchor rods at the bottom of the swivel support into the reserved holes on the lower bearing platform on the inner side of the annular slide;

[0019] 5) Multiple pairs of swivel legs are provided on the annular slide;

[0020] 6) Two traction reaction seats are symmetrically arranged on the outer side of the top surface of the lower bearing platform;

[0021] 7) Construct an inner ring booster reaction seat on the top surface of the lower bearing platform between the annular slide and the swivel support, and construct an outer ring booster reaction seat on the outside of the annular slide;

[0022] 8) Construct the upper platform with the upper turntable. At the same time, fix the multiple anchor rods on the top of the swivel support and the upper parts of the multiple pairs of swivel legs to the corresponding parts of the upper turntable. Use a P-type anchor to fix the embedded end of each traction cable inside the upper turntable and embed it halfway inside the upper turntable. Then, wrap the traction cable outside the upper turntable around the upper turntable.

[0023] 9) Construct piers and pad stones on the upper bearing platform and assemble steel trusses;

[0024] 10) Construct a curved foundation on the ground behind the bridge swivel platform;

[0025] 11) Place the running wheels on the curved foundation, then install the steel truss on the running wheels, and then weld the upper end of the steel truss to the steel truss beam;

[0026] 12) Construct multiple reaction blocks spaced apart on the curved foundation near the edge of the bridge's rotating wall;

[0027] 13) Place a through-type jack on each traction reaction seat and pass the outer end of a traction rope through a through-type jack;

[0028] 14) Start the through-type jack and use it to pull the traction rope to one side, which then drives the upper part of the swivel support to rotate together through the upper turntable. At the same time, the swivel support legs move in the same direction on the circular slide. At the same time, the steel truss moves on the curved foundation away from the existing railway via the running wheels, thereby rotating the steel truss above the existing railway.

[0029] 15) When the above-mentioned through-type jacks are unable to pull the steel truss, it is necessary to add an appropriate number of through-type jacks on the outer ring booster reaction seat to increase the traction force, thereby completing the rotation construction process of the steel truss.

[0030] The steel truss beam rotation construction system and method provided by the present invention have the following beneficial effects: the construction system structure is reasonably designed, safe and reliable, the construction time is short, the application effect is significant, and the construction safety and precision control are effectively guaranteed, providing a guidance scheme for large-span cantilever rotation steel truss beam bridges across high-speed railways. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the rotation system in the steel truss beam rotation construction system across the high-speed railway provided by the present invention.

[0032] Figure 2 This is an elevation view of the auxiliary slideway system in the steel truss beam cross-high-speed railway rotation construction system provided by the present invention.

[0033] Figure 3 This is a side view of the auxiliary slide system in the steel truss beam spanning high-speed railway rotation construction system provided by the present invention.

[0034] Figure 4 This is a plan view of the construction process using the steel truss beam rotation construction method across the high-speed railway provided by the present invention. DETAILED DESCRIPTION

[0035] The following is a detailed description of the steel truss beam rotation construction system and method for high-speed railway provided by the present invention in conjunction with the accompanying drawings and specific embodiments. The following embodiments are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0036] Now let's take a certain bridge project as an example: the bridge is a municipal bridge, which adopts the form of (119+268+119)m upper reinforced continuous steel truss. The construction system and method of the present invention were used to safely and smoothly realize the rotation construction of the upper reinforced steel truss across the Beijing-Shanghai High-Speed ​​Railway. The anti-overturning stability coefficient of the steel truss during the rotation was above 2.0. No safety accidents occurred during the period, and no deviations in the elevation and position of the beam exceeded the limit. Within the 110-minute II-level skylight point of the railway, the upper reinforced steel truss (rotation tonnage 15,000t) across the Beijing-Shanghai High-Speed ​​Railway was smoothly rotated 33.4° counterclockwise.

[0037] like Figures 1-4As shown, the steel truss cross-high-speed railway rotation construction system provided by the present invention includes a rotation system 15 and an auxiliary slide system 13; wherein the rotation system 15 is arranged on the bridge rotation wall, including a booster reaction seat 1, a traction reaction seat 2, a traction rope 3, an annular slide 4, a rotation support 5, a rotation support leg 6, a lower support platform 7, an upper support platform 8 and a through-type jack; wherein the upper support platform 8 is located above the lower support platform 7, and an upper turntable is provided in the middle of the bottom surface, and a pier body, a cushion stone and a steel truss 14 are sequentially provided on the upper end of the upper support platform 8; an inner and outer circle of booster reaction seats 1 are concentrically provided on the top surface of the lower support platform 7, and a plurality of booster reaction seats 1 in each circle are arranged at intervals, and the booster reaction seats 1 in the inner and outer circles are arranged correspondingly; the annular slide 4 is buried in the top of the lower support platform 7 between the two circles of booster reaction seats 1, and The top surface of the annular slide 4 is flush with the top surface of the lower support platform 7; the swivel support 5 is located on the inner side of the inner ring booster reaction seat 1, and is provided with a plurality of anchor rods on the top and bottom that are respectively fixed to the upper turntable and the upper part of the lower support platform 7 of the upper support platform 8; a plurality of pairs of swivel legs 6 are arranged at intervals between the upper turntable and the annular slide 4, and the upper part of the swivel legs 6 is embedded in the outer part of the upper turntable, and the lower end is supported on the top surface of the annular slide 4 to play an auxiliary supporting role; the two traction reaction seats 2 are symmetrically arranged on the top surface of the lower support platform 7 outside the outer ring booster reaction seat 1 for installing a through-type jack; the embedded end of each traction rope 3 is fixed to the inside of the upper turntable with a P-type anchor and embedded in the inner half circle of the upper turntable. The traction rope 3 located outside the upper turntable is wrapped around the upper turntable, and the outermost end passes through a through-type jack;

[0038] The auxiliary slide system 13 includes an arc-shaped foundation 9, running wheels 10, a steel truss 11 and a reaction seat 12; wherein, the arc-shaped foundation 9 is arranged on the foundation behind the bridge rotating wall, and the arc center is located on one side of the bridge rotating wall; the lower end of the steel truss 11 is respectively arranged on the arc-shaped foundation 9 by the running wheels 10, and the upper end is connected to the steel truss 14 to support the steel truss 14; the reaction seat 12 is an inverted L-shaped structure, and the lower ends of multiple reaction seats 12 are fixed at intervals on the arc-shaped foundation 9 near the edge of one side of the bridge rotating wall.

[0039] In this embodiment, the width of the annular slideway 4 is 1.1 m, and the lower side is a positioning bracket. A 24 mm thick steel plate is installed on the upper end of the positioning bracket, and a 3 mm thick stainless steel plate is installed above the steel plate.

[0040] Sixteen 45# anchor rods are respectively provided on the top and bottom of the swivel support 5 .

[0041] A total of eight pairs of swivel legs 6 are arranged side by side between the upper turntable and the annular slide 4. Each swivel leg 6 includes two upper and lower leg steel pipes and a 24mm thick steel plate installed at the lower end of the leg steel pipe. C45 shrinkage compensating concrete is poured into the leg steel pipe.

[0042] Each traction rope 3 is threaded with 31 steel strands with a diameter of 15.2 mm and a strength of 1860 MPa.

[0043] The traction reaction seat 2 is a reinforced concrete structure with dimensions of 2.5 m in length, 2 m in width and 1.5 m in height.

[0044] There are eight booster-reaction force seats 1 in each circle, and they correspond one-to-one to the arrangement positions of the eight pairs of swivel legs 6 .

[0045] The arc-shaped foundation 9 is a reinforced concrete structure.

[0046] The steel truss 11 is a frame structure made of steel pipes.

[0047] The construction method of the steel truss beam rotation construction system across a high-speed railway provided by the present invention comprises the following steps performed in sequence:

[0048] 1) First, the lower pedestal 7 of the bridge's rotating platform is constructed. The lower pedestal 7 is constructed in two steps. The first step is to construct it to the height at which the bottom of the annular slideway 4 in the rotating system 15 is set, thus forming the lower pedestal substructure.

[0049] 2) Installing an annular slideway 4 on the top surface of the lower structure of the lower support platform;

[0050] 3) The second step of constructing the lower pedestal 7 is performed on the top surface of the lower pedestal substructure to form the lower pedestal superstructure. Pre-requisite holes for installing multiple anchor rods at the bottom of the swivel support 5 are formed in the lower pedestal superstructure located inside the annular slideway 4 until the height reaches the installation height of the top surface of the annular slideway 4, thereby completing the lower pedestal 7.

[0051] 4) Fix the multiple anchor rods at the bottom of the swivel support 5 into the reserved holes on the lower support 7 on the inner side of the annular slide 4;

[0052] 5) multiple pairs of swivel legs 6 are provided on the annular slide 4;

[0053] 6) Two traction reaction seats 2 are symmetrically arranged on the outer side of the top surface of the lower support 7;

[0054] 7) Construct an inner ring booster reaction seat 1 on the top surface of the lower support 7 between the annular slide 4 and the swivel support 5, and construct an outer ring booster reaction seat 1 on the outside of the annular slide 4;

[0055] 8) Construct the upper platform 8 with the upper turntable. At the same time, fix the multiple anchor rods on the top of the swivel support 5 and the upper parts of the multiple pairs of swivel legs 6 to the corresponding parts of the upper turntable. Use a P-type anchor to fix the embedded end of each traction cable 3 inside the upper turntable and embed it halfway inside the upper turntable. Then, wrap the traction cable 3 outside the upper turntable around the upper turntable.

[0056] 9) Construct the pier body and pad stone on the upper bearing platform 8 and assemble the steel truss 14;

[0057] 10) Constructing a curved foundation 9 on the foundation behind the bridge swivel pier;

[0058] 11) Place the running wheel 10 on the arc-shaped foundation 9, then install the steel truss 11 on the running wheel 10, and then weld the upper end of the steel truss 11 to the steel truss beam 14;

[0059] 12) Construct multiple reaction seats 12 spaced apart on the curved foundation 9 near the edge of one side of the bridge swivel wall;

[0060] 13) Place a through-type jack on each traction reaction seat 2, and pass the outer end of a traction rope 3 through a through-type jack;

[0061] 14) Start the through-type jack and use it to pull the traction rope 3 to one side, thereby driving the upper part of the swivel support 5 to rotate together through the upper turntable. At the same time, the swivel support 6 moves in the same direction on the annular slide 4. At the same time, the steel truss 11 moves on the curved foundation 9 away from the existing railway 16 via the running wheels 10, thereby rotating the steel truss 14 above the existing railway 16. In this embodiment, the through-type jack is a 500t through-type jack.

[0062] 15) When the through-type jacks mentioned above are unable to pull the steel truss beam 14, it is necessary to add an appropriate number of through-type jacks on the outer ring booster reaction seat 1 to increase the traction force, thereby completing the rotation construction process of the steel truss beam 14.

Claims

1. A steel truss girder rotation construction system across a high-speed railway, characterized by: The steel truss beam cross-high-speed railway rotation construction system includes a rotation system (15) and an auxiliary slideway system (13); wherein the rotation system (15) is arranged on the bridge rotation wall, and includes a booster reaction seat (1), a traction reaction seat (2), a traction rope (3), an annular slideway (4), a rotation support (5), a rotation support foot (6), a lower support platform (7), an upper support platform (8) and a through-type jack; wherein the upper support platform (8) is located above the lower support platform (7), an upper turntable is provided in the middle of the bottom surface, and a pier body, a cushion stone and a steel truss beam (14) are sequentially provided on the upper end of the upper support platform (8); an inner and outer circle of booster reaction seats (1) are concentrically provided on the top surface of the lower support platform (7), and a plurality of booster reaction seats (1) in each circle are arranged at intervals, and the booster reaction seats (1) in the inner and outer circles are arranged correspondingly; the annular slideway (4) is buried in the lower support platform (7) located between the two circles of booster reaction seats (1) The top of the annular slideway (4) is flush with the top of the lower support platform (7); the swivel support (5) is located on the inner side of the inner ring booster reaction seat (1), and the top and bottom are provided with multiple anchor rods respectively fixed to the upper turntable of the upper support platform (8) and the upper part of the lower support platform (7); multiple pairs of swivel legs (6) are arranged between the upper turntable and the annular slideway (4), the upper part of the swivel legs (6) is embedded in the outer part of the upper turntable, and the lower end is supported on the annular support platform (7). The top surface of the slideway (4) plays an auxiliary supporting role; two traction reaction seats (2) are symmetrically arranged on the top surface of the lower support platform (7) located outside the outer ring boost reaction seat (1) for installing a through-type jack; the embedded end of each traction rope (3) is fixed to the inside of the upper turntable by a P-type anchor and embedded in the inner half circle of the upper turntable, and the traction rope (3) located outside the upper turntable is wound around the upper turntable once, and the outermost end passes through a through-type jack; The auxiliary slide system (13) includes an arc-shaped foundation (9), running wheels (10), a steel truss (11) and a reaction seat (12); wherein the arc-shaped foundation (9) is arranged on a foundation located behind the bridge rotating wall, and the arc center is located on one side of the bridge rotating wall; the lower end of the steel truss (11) is respectively arranged on the arc-shaped foundation (9) by using running wheels (10), and the upper end is connected to the steel truss (14) to support the steel truss (14); the reaction seat (12) is an inverted L-shaped structure, and the lower ends of multiple reaction seats (12) are fixed on the arc-shaped foundation (9) at intervals near the edge of one side of the bridge rotating wall.

2. The steel truss beam rotation construction system across a high-speed railway according to claim 1 is characterized in that: The width of the annular slideway (4) is 1.1 m, and the lower side is a positioning bracket, the upper end of the positioning bracket is installed with a 24 mm thick steel plate, and the upper end of the steel plate is installed with a 3 mm thick stainless steel plate.

3. The steel truss beam rotation construction system across a high-speed railway according to claim 1 is characterized in that: Sixteen 45# anchor rods are respectively provided on the top and bottom of the swivel support (5).

4. The steel truss beam rotation construction system across a high-speed railway according to claim 1 is characterized in that: A total of eight pairs of swivel legs (6) arranged side by side are provided between the upper turntable and the annular slideway (4), each swivel leg (6) comprising two upper and lower swivel leg steel pipes and a 24 mm thick steel plate installed at the lower end of the swivel leg steel pipe, and C45 shrinkage compensating concrete is poured into the swivel leg steel pipe.

5. The steel truss beam rotation construction system across a high-speed railway according to claim 1 is characterized in that: Each traction rope (3) is threaded with 31 steel strands with a diameter of 15.2 mm and a strength of 1860 MPa.

6. The steel truss beam rotation construction system across a high-speed railway according to claim 1 is characterized in that: The traction reaction seat (2) is a reinforced concrete structure with dimensions of 2.5m in length, 2m in width and 1.5m in height.

7. The steel truss beam rotation construction system across a high-speed railway according to claim 1 is characterized by: The number of the boosting and reaction seats (1) in each circle is 8, and they correspond one to one with the arrangement positions of the eight pairs of rotating support legs (6).

8. The steel truss beam rotation construction system across a high-speed railway according to claim 1 is characterized by: The arc-shaped foundation (9) is a reinforced concrete structure.

9. The steel truss beam rotation construction system across a high-speed railway according to claim 1, characterized in that: The steel truss (11) is a frame structure made of steel pipes.

10. A construction method using the steel truss beam rotation construction system across a high-speed railway as described in claim 1, characterized in that: The construction method comprises the following steps performed in sequence: 1) First, the lower pedestal (7) of the bridge swivel wall is constructed. The lower pedestal (7) is constructed in two steps. The first step is to construct it to the height of the bottom of the annular slideway (4) in the swivel system (15) to form the lower structure of the lower pedestal; 2) Installing an annular slideway (4) on the top surface of the lower structure of the lower support platform; 3) performing the second step of construction of the lower pedestal (7) on the top surface of the lower pedestal substructure to form the lower pedestal superstructure, and forming reserved holes for setting a plurality of anchor rods at the bottom of the swivel support (5) in the lower pedestal superstructure located inside the annular slideway (4) until the setting height of the top surface of the annular slideway (4) is reached, thereby forming the lower pedestal (7); 4) fixing multiple anchor rods at the bottom of the swivel support (5) into the reserved holes on the lower support platform (7) on the inner side of the annular slideway (4); 5) multiple pairs of swivel legs (6) are provided on the annular slideway (4); 6) Two traction reaction seats (2) are symmetrically arranged on the outer side of the top surface of the lower support platform (7); 7) constructing an inner ring booster reaction seat (1) on the top surface of the lower support platform (7) between the annular slideway (4) and the swivel support (5), and constructing an outer ring booster reaction seat (1) on the outside of the annular slideway (4); 8) constructing an upper support platform (8) with an upper turntable, and simultaneously fixing multiple anchor rods on the top of the swivel support (5) and the upper parts of multiple pairs of swivel legs (6) to corresponding positions on the upper turntable, fixing the embedded end of each traction rope (3) inside the upper turntable with a P-type anchor, and embedding it half a circle inside the upper turntable, and then winding the traction rope (3) outside the upper turntable around the upper turntable; 9) Construct the pier body and pad stone on the upper bearing platform (8) and assemble the steel truss (14); 10) Constructing a curved foundation (9) on the ground behind the bridge swivel platform; 11) placing the running wheel (10) on the arc-shaped foundation (9), then installing the steel truss (11) on the running wheel (10), and then welding the upper end of the steel truss (11) to the steel truss beam (14); 12) constructing a plurality of reaction seats (12) spaced apart on the arc-shaped foundation (9) near the edge of one side of the bridge swivel wall; 13) Place a through-type jack on each traction reaction seat (2), and pass the outer end of a traction rope (3) through the through-type jack; 14) Start the through-type jack, use the through-type jack to pull the traction rope (3) to one side, and then drive the upper part of the swivel support (5) to rotate together through the upper turntable, and at the same time, the swivel support (6) moves on the annular slideway (4) in the same direction. At the same time, the steel truss (11) moves on the arc foundation (9) to the side away from the existing railway (16) through the running wheel (10), thereby rotating the steel truss (14) to the top of the existing railway (16); 15) When the through-type jacks mentioned above are unable to pull the steel truss (14), it is necessary to add an appropriate number of through-type jacks on the outer ring booster reaction seat (1) to increase the traction force, thereby completing the rotation construction process of the steel truss (14).

Images