An anti-overturning structure for a high-curvature ramp bridge spanning an existing road and its construction method

Abstract

This invention relates to an anti-overturning structure for a high-curvature ramp bridge crossing an existing road. The ramp bridge's steel box girder is divided into an inner curved section and an outer curved section, resting on piers with temporary support frames on both sides, with the existing road below. Cable-stayed support poles are installed on the already constructed steel box girders on both sides, with the tops of the poles connected and stabilized by connecting rods. Cable-stayed support plates are installed on the top plates of the already constructed steel box girders, and cable-stayed support plates are also installed on the ground inside the curved section of the already constructed ramp. The cable-stayed supports and poles form a stabilizing system for the steel box girder sections. This invention ensures that the steel box girder will not overturn, and the entire construction process does not affect vehicle traffic on the existing road below.

Description

Technical Field

[0001] This invention relates to the field of steel box girder ramp bridge construction technology, specifically to an anti-overturning structure for a large-curvature ramp bridge spanning an existing road. Background Technology

[0002] Ramp bridges generally have a small curve radius and a large curvature. When constructing steel box girders for ramp bridges that cross existing roads, the center of gravity of the steel box girder tends to shift away from the piers or supporting frames on both sides, posing a significant risk of overturning. Similar overturning cases have already occurred in China.

[0003] For ramp bridges with large curvatures that cross existing roads, because their center of gravity is off-center from the piers or supporting frames on both sides, temporary supporting frames are usually erected in the middle of the road to prevent them from overturning. During the erection, dismantling and use of temporary supporting towers, traffic on the existing road will be affected.

[0004] A search using the keyword "steel box girder anti-overturning" revealed: ① a steel box girder anti-overturning structure, publication number CN201520659108.1; a search using the keyword "ramp bridge construction" revealed: ② a steel box girder installation device for ramp bridge construction, publication number CN202120829637.7; a search using the keyword "steel box girder stability" revealed: ③ a steel-concrete composite cable-stayed bridge, publication number CN202111631479.5. All of these involve steel box girder construction. ① is a connection structure with anchor bars and pins; ② is used for ramp bridge steel box girder construction to lift the steel box girder and ensure its levelness; ③ is a steel-concrete composite cable-stayed bridge. Summary of the Invention

[0005] This invention aims to overcome the shortcomings of existing technologies and provide an anti-overturning structure for ramp bridges with large curvatures that cross existing roads, solving the problem of overturning caused by the center of gravity of the steel box girder of the ramp bridge being offset from the piers or supporting frames on both sides.

[0006] To solve the above-mentioned technical problems, the present invention is implemented as follows:

[0007] An anti-overturning structure for a large-curvature ramp bridge spanning an existing road is characterized in that: the ramp bridge steel box girder is divided into an inner section of the ramp bridge curve and an outer section of the ramp bridge curve, which rests on the piers on both sides where temporary support frames are installed, and the existing road is located below it.

[0008] The center of gravity of the inner curved section of the ramp bridge extends beyond the end support point of the section.

[0009] The center of gravity of the outer curved section of the ramp bridge extends beyond the end support point of the section.

[0010] Cable support poles are installed on the steel box girders of the ramp bridges that have been constructed on both sides, and the tops of the poles are connected and stabilized by connecting poles.

[0011] Guy rope fixing lugs are installed on the top plate of the steel box girder of the ramp bridge that has been constructed. Guy rope fixing lugs are installed on the top plate of the steel box girder of the cross-road ramp bridge. Guy rope ground anchors are installed on the ground inside the curve of the ramp bridge that has been constructed.

[0012] A stabilizing system for the steel box girder bridge segment is formed by guy ropes and uprights;

[0013] The guy ropes and poles form a stable system for the steel box girder bridge section.

[0014] The anti-overturning structure for a large-curvature ramp bridge crossing an existing road is characterized in that: a temporary support frame is installed on the upper part of the ramp bridge support tower foundation.

[0015] The anti-overturning structure for the large curvature ramp bridge crossing an existing road is characterized by: a chain hoist being installed between the guy rope and the ground anchor for tensioning the guy rope;

[0016] A chain hoist is installed between the guy rope and the fixed lug for tensioning the guy rope;

[0017] A chain hoist is installed between the guy rope and the fixed lug for tensioning the guy rope;

[0018] A chain hoist is installed between the guy rope and the fixed lug for tensioning the guy rope;

[0019] A chain hoist is installed between the guy rope and the fixed lug for tensioning the guy rope;

[0020] A chain hoist is installed between the guy rope and the fixed lug to tension the guy rope.

[0021] The construction method for the anti-overturning structure of the ramp bridge with large curvature crossing an existing road is characterized by the following steps:

[0022] Step 1: The steel box girder of the ramp bridge is constructed first, and guy rope support poles are installed on it. The top of the poles is connected and stabilized by connecting poles. At the same time, guy ropes are welded to fix the ear plates, and guy rope ground anchors are installed on the ground inside the curve of the ramp bridge.

[0023] Step 2: Weld guy ropes to fix the ear plates on the top plate of the inner side of the ramp bridge curve. After hoisting into place, tension the guy ropes with a chain hoist to ensure the stability of the inner side of the ramp bridge curve.

[0024] Step 3: Weld the guy rope fixing plate to the top plate of the outer side of the ramp bridge curve, and after hoisting it into place, tighten the guy rope with a chain hoist to ensure the stability of the inner side of the ramp bridge curve. At the same time, connect and fix the limiting plate to the inner side of the ramp bridge curve to ensure the stability of the outer side of the ramp bridge curve.

[0025] The beneficial effects of this invention are as follows: This application proposes a method to prevent ramp bridges from overturning due to excessive horizontal curvature when constructing ramp steel bridges above existing roads with normal traffic. Vertical poles are set at the ends of the ramp bridges that have been constructed at both ends, and the outer mid-span area of ​​the steel box girder is stabilized by guy ropes to ensure that the steel box girder will not overturn. At the same time, the entire construction process does not affect the traffic of vehicles on the existing road below.

[0026] This application is primarily used for the construction of steel box girders on ramp bridges above existing roads. It employs guy ropes to stabilize the outer mid-span area of ​​the steel box girder, ensuring that the girder will not overturn due to excessive eccentricity during the entire construction process, while also not affecting vehicle traffic on the existing road below. The entire tensioning system is ingeniously conceived, with a simple principle, and meets the needs of actual construction. Attached Figure Description

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments:

[0028] Figure 1 This is a schematic diagram of the construction of the ramp bridge on the outer side of the existing highway.

[0029] Figure 2 for Figure 1 Schematic diagram of the AA direction.

[0030] Figure 3 for Figure 1 Diagram of the BB direction.

[0031] Figure 4 This is a schematic diagram of the hoisting of the inner section of the overpass ramp.

[0032] Figure 5 for Figure 4 Schematic diagram of the AA direction.

[0033] Figure 6 for Figure 4 Diagram of the BB direction.

[0034] Figure 7 This is a schematic diagram of the hoisting of the outer section of the overpass ramp.

[0035] Figure 8 for Figure 7 Diagram of the BB direction.

[0036] Figure 9 for Figure 7 Diagram of the CC direction. Detailed Implementation

[0037] like Figure 8 As shown: An anti-overturning structure for a ramp bridge with large curvature crossing an existing road, specifically:

[0038] Due to limitations in transport width and crane lifting capacity, the steel box girders for the overpass ramp bridge need to be hoisted in sections along the longitudinal direction and then welded together at high altitude to form a whole. The steel box girders for the ramp bridge under construction are divided into two sections: the inner section 1a of the ramp bridge curve and the outer section 1b of the ramp bridge curve.

[0039] The bridge is located on the piers 17 and temporary support frame 18 on both sides, with the existing road 2 below it. The temporary support frame is installed on the upper part of the ramp bridge support tower foundation 19.

[0040] The center of gravity of the inner side of the ramp bridge segment 1a is 4a, and its extended line 5a extends beyond the end support point of segment 1a, posing a risk of overturning.

[0041] The center of gravity of the outer curved section 1b of the ramp bridge is 4b, and its extended line 5b extends beyond the end support point of section 1b, posing a risk of overturning.

[0042] Cable support poles 9a and 9b are installed on the steel box girders 3 of the ramp bridges that have already been constructed on both sides. The tops of poles 9a and 9b are connected and stabilized by connecting poles 10.

[0043] Cable guy rope fixing lugs 13b, 16a, and 16b are installed on the top plate of the steel box girder 3 of the completed ramp bridge. Cable guy rope fixing lugs 8a and 8b are installed on the top plate of the steel box girder 1 of the cross-road ramp bridge. Cable guy rope ground anchor 13a is installed on the ground inside the curve of the completed ramp bridge 3.

[0044] The guy ropes 11a, 14a, and 6a, together with the uprights 9a, form a stable system for the steel box girder bridge segment 1a.

[0045] A chain hoist 12a is provided between the guy rope 11a and the ground anchor 13a for tensioning the guy rope 11a.

[0046] A chain hoist 15a is provided between the guy rope 14a and the fixed ear plate 16a for tensioning the guy rope 14a.

[0047] A chain hoist 7a is provided between the guy rope 6a and the fixed ear plate 8a to tension the guy rope 6a.

[0048] The guy ropes 11b, 14b, and 6b, together with the upright 9b, form a stabilizing system for the steel box girder bridge segment 1b.

[0049] A chain hoist 12b is provided between the guy rope 11b and the fixed ear plate 13b for tensioning the guy rope 11b.

[0050] A chain hoist 15b is provided between the guy rope 14b and the fixed ear plate 16b for tensioning the guy rope 14b.

[0051] A chain hoist 7b is provided between the guy rope 6b and the fixed ear plate 8b to tension the guy rope 6b.

[0052] The construction process for overpass ramp bridges is as follows:

[0053] like Figure 1-3 As shown: Step 1: The steel box girder 3 of the ramp bridge is constructed first, and guy rope support poles 9a and 9b are set on it. The top of poles 9a and 9b are connected and stabilized by connecting pole 10. At the same time, guy rope fixing ear plates 16a, 16b and 13b are welded (or can be welded in the factory). Guy rope ground anchor 13a is set on the ground inside the curve of the ramp bridge 3.

[0054] like Figure 4-6 As shown: Step 2: Weld the guy rope fixing ear plate 8a onto the top plate of the inner side of the ramp bridge section 1a. After hoisting into place, tension the guy ropes 11a, 14a, and 6a using chain hoists 12a, 15a, and 7a to ensure the stability of the inner side of the ramp bridge section 1a.

[0055] like Figure 7-9 As shown: Step 3: Weld the guy rope fixing ear plate 8b onto the top plate of the outer side of the ramp bridge section 1b. After hoisting it into place, tension the guy ropes 11b, 14b, and 6b using chain hoists 12b, 15b, and 7b to ensure the stability of the inner side of the ramp bridge section (1a). At the same time, connect and fix the limiting plate 20 to the inner side of the ramp bridge section 1a to ensure the stability of the outer side of the ramp bridge section 1b.

Claims

1. An anti-overturning structure for a ramp bridge with large curvature crossing an existing road, characterized in that: The ramp bridge steel box girder (3) is divided into the inner side of the ramp bridge curve (1a) and the outer side of the ramp bridge curve (1b), and is located on the pier (17). Temporary support frames (18) are installed on both sides of the pier (17). The existing road (2) is located below the ramp bridge steel box girder (3). The extension line (5a) of the center of gravity of the inner curved section (1a) of the ramp bridge extends beyond the end support point of the inner curved section (1a) of the ramp bridge; the extension line (5b) of the center of gravity of the outer curved section (1b) of the ramp bridge extends beyond the end support point of the outer curved section (1b) of the ramp bridge. On the steel box girders (3) of the ramp bridges that have been constructed on both sides, a first cable wind support pole (9a) and a second cable wind support pole (9b) are respectively installed. The tops of the first cable wind support pole (9a) and the second cable wind support pole (9b) are connected by a connecting pole (10). A first fixed ear plate (16a), a second fixed ear plate (16b), and a third fixed ear plate (13b) are installed on the top plate of the already constructed ramp bridge steel box girder (3); a fourth fixed ear plate (8a) is installed on the top plate of the inner side of the ramp bridge section (1a) of the ramp bridge steel box girder (3) crossing the road; a fifth fixed ear plate (8b) is installed on the top plate of the outer side of the ramp bridge section (1b) of the ramp bridge steel box girder (3) crossing the road; and a guy rope ground anchor (13a) is installed on the ground of the inner side of the ramp bridge section of the already constructed ramp bridge. A stabilizing system for the inner curved section (1a) of the ramp bridge is formed by the first guy rope (11a), the second guy rope (14a), the third guy rope (6a), and the first guy support pole (9a): one end of the first guy rope (11a) is connected to the first guy support pole (9a), and the other end is connected to the ground anchor (13a); one end of the second guy rope (14a) is connected to the first guy support pole (9a), and the other end is connected to the first fixed ear plate (16a); one end of the third guy rope (6a) is connected to the first guy support pole (9a), and the other end is connected to the fourth fixed ear plate (8a). A stabilizing system for the outer side of the ramp bridge (1b) is formed by the fourth guy rope (11b), the fifth guy rope (14b), the sixth guy rope (6b) and the second guy support pole (9b): one end of the fourth guy rope (11b) is connected to the second guy support pole (9b) and the other end is connected to the third fixed ear plate (13b); one end of the fifth guy rope (14b) is connected to the second guy support pole (9b) and the other end is connected to the second fixed ear plate (16b); one end of the sixth guy rope (6b) is connected to the second guy support pole (9b) and the other end is connected to the fifth fixed ear plate (8b).

2. The anti-overturning structure for a large-curvature ramp bridge crossing an existing road according to claim 1, characterized in that: The temporary support frame (18) is installed on the upper part of the ramp bridge support tower foundation (19).

3. The anti-overturning structure for a large-curvature ramp bridge crossing an existing road according to claim 1, characterized in that: A first chain hoist (12a) is provided between the first guy rope (11a) and the guy rope ground anchor (13a) for tensioning the first guy rope (11a). A second chain hoist (15a) is provided between the second guy rope (14a) and the first fixed lug (16a) for tensioning the second guy rope (14a). A third chain hoist (7a) is provided between the third guy rope (6a) and the fourth fixed lug (8a) for tensioning the third guy rope (6a). A fourth chain hoist (12b) is provided between the fourth guy rope (11b) and the third fixed lug (13b) for tensioning the fourth guy rope (11b). A fifth chain hoist (15b) is provided between the fifth guy rope (14b) and the second fixed lug (16b) for tensioning the fifth guy rope (14b). A sixth chain hoist (7b) is provided between the sixth guy rope (6b) and the fifth fixed lug (8b) for tensioning the sixth guy rope (6b).

4. The construction method for the anti-overturning structure of a ramp bridge with large curvature crossing an existing road according to claim 3, characterized in that... Includes the following steps: Step 1: The steel box girder (3) of the ramp bridge is constructed first, and the first guy wire support pole (9a) and the second guy wire support pole (9b) are set on it. The top of the first guy wire support pole (9a) and the second guy wire support pole (9b) are connected by a connecting pole (10). At the same time, the first fixed ear plate (16a), the second fixed ear plate (16b) and the third fixed ear plate (13b) are welded. The guy wire anchor (13a) is set on the ground of the inner side of the ramp bridge section with the curve that has been constructed. Step 2: Weld the fourth fixed ear plate (8a) onto the top plate of the inner curved section (1a) of the ramp bridge. After hoisting it into place, use the first chain hoist (12a) to tension the first guy rope (11a), the second chain hoist (15a) to tension the second guy rope (14a), and the third chain hoist (7a) to tension the third guy rope (6a) to ensure the stability of the inner curved section (1a) of the ramp bridge. Step 3: Weld the fifth fixed ear plate (8b) onto the top plate of the outer side of the ramp bridge section (1b). After hoisting it into place, use the fourth chain hoist (12b) to tension the fourth guy rope (11b), the fifth chain hoist (15b) to tension the fifth guy rope (14b), and the sixth chain hoist (7b) to tension the sixth guy rope (6b). At the same time, the limiting plate (20) is connected and fixed to the inner side of the ramp bridge (1a) to ensure the stability of the outer side of the ramp bridge (1b).

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