A steel structure bridge with an integrated full-bridge jacking method and its construction method

Abstract

The present invention specifically relates to a steel structure bridge with an integrated full-bridge incremental launching method. It is characterized in that the bridge adopts a continuous steel beam structure, and is attached with bridge deck auxiliary facilities including anti-collision guardrails and anti-throwing nets. The anti-collision guardrails are arranged on both sides of the continuous steel beam structure, and the anti-throwing nets are arranged on the top surfaces of the anti-collision guardrails. During the incremental launching of the bridge, the bridge deck auxiliary facilities including anti-collision guardrails and anti-throwing nets are launched together with the main bridge steel structure. The present invention launches the auxiliary facilities such as anti-collision guardrails and anti-throwing nets and the main structure synchronously at one time to cross busy traffic arteries such as highways / railways, etc. There is no subsequent construction risk of high-altitude falling objects above the traffic arteries, ensuring that the bridge can quickly and safely cross busy traffic arteries such as highways / railways, etc., and realizing zero interference to the traffic arteries throughout the construction process.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge engineering, and particularly relates to a steel structure bridge with integrated full-bridge incremental launching and a construction method thereof. Background Art

[0002] The characteristics of the incremental launching method are as follows: no scaffolds and large machinery are required, the engineering quality is easy to control, the occupied site is small, and it is not affected by seasons. During construction, it does not affect the navigation and traffic under the bridge, and is not interfered by the terrain and water flow under the bridge. No complex technologies and equipment are required, tools are easy to prepare, and general construction units can organize construction.

[0003] For bridges spanning busy traffic arteries such as highways / railways, steel box girder structures are generally adopted, and the incremental launching method for bridge construction is an effective construction method. During the traditional incremental launching construction, the main structure of the steel box girder is first constructed by the incremental launching method, and the remaining bridge deck auxiliary facilities such as anti-collision guardrails and anti-throwing nets are constructed on the bridge after the main structure of the steel box girder is pushed in place. This inevitably involves construction processes such as formwork installation, concrete pouring, and steel structure welding above the traffic artery, posing a construction risk of falling objects from height, and causing a certain interference to the traffic artery during the construction of the bridge auxiliary facilities. Summary of the Invention

[0004] The purpose of the invention is to provide a steel structure bridge with integrated full-bridge incremental launching and a construction method thereof, which can reduce the interference to the traffic artery during the construction of the bridge auxiliary facilities.

[0005] To achieve the purpose of the invention, the invention is completed by the following technical solutions: a steel structure bridge with integrated full-bridge incremental launching, characterized in that the bridge adopts a continuous steel structure beam, and the bridge deck auxiliary facilities including anti-collision guardrails and anti-throwing nets are attached thereto. The anti-collision guardrails are arranged on both sides of the continuous steel structure beam, and the anti-throwing nets are arranged on the top surface of the anti-collision guardrails. During the incremental launching of the bridge, the bridge deck auxiliary facilities including anti-collision guardrails and anti-throwing nets are launched together with the main bridge steel structure.

[0006] Furthermore, reinforcing bars are arranged at the top of the anti-collision guardrails of the bridge to bear the negative bending moment during the incremental launching of the anti-collision wall.

[0007] Furthermore, the anti-throwing net includes an anti-throwing net support, an anti-throwing net mesh, and an anti-throwing net frame. The anti-throwing net mesh is welded to the anti-throwing net frame, and the anti-throwing net frame is bolted to the anti-throwing net support. The anti-throwing net is welded and fixed to the embedded steel plate on the top surface of the anti-collision guardrail through the anti-throwing net support.

[0008] Furthermore, ear plates are arranged on the sides of the anti-throwing net support and the anti-throwing net frame, bolt holes are arranged on the ear plates, and the bolt holes are arranged as oval holes along the incremental launching direction of the bridge to adapt to the deformation of the anti-throwing net during incremental launching.

[0009] Furthermore, an embedded steel plate is arranged on the top of the anti-collision guardrail, and the anti-throwing net bracket is welded to the embedded steel plate on the top surface of the anti-collision guardrail.

[0010] Furthermore, a construction method for a steel structure bridge with full-bridge integrated top-pushing is provided, characterized in that the construction method comprises the following steps:

[0011] A. Set up temporary jacking supports along the bridge;

[0012] B. Install the first section of steel box girder;

[0013] C. Cast concrete anti-collision guardrails on both sides of the first section steel box girder;

[0014] D. Install the first section of the anti-throwing net;

[0015] E. Install the jacking steel guide beam and jacking device;

[0016] F. Push the first section of the steel box girder to complete the first push;

[0017] G. Install the second section steel box girder;

[0018] H. Cast concrete anti-collision guardrails on both sides of the second section steel box girder;

[0019] I. Install the second section of the anti-throwing net;

[0020] J. Push the second section of the steel box girder to complete the second push;

[0021] K. Repeat steps G, H, I, and J until the steel box girder is pushed into place;

[0022] L. Remove the jacking device and temporary jacking support to complete the jacking construction.

[0023] The present invention is applicable to bridges that cross busy traffic arteries such as highways / railways. During the construction of the bridge, traffic on the traffic arteries under the bridge shall not be interrupted. The bridge uses the jacking method to cross busy traffic arteries such as highways / railways at one time. The advantages of the present invention are: auxiliary facilities such as anti-collision guardrails and anti-throwing nets are jacked together with the main structure at one time to cross busy traffic arteries such as highways / railways. There is no subsequent construction risk of falling objects from high altitude above the traffic arteries, ensuring that the bridge quickly and safely crosses busy traffic arteries such as highways / railways, and achieving zero interference with traffic arteries during the entire construction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings, wherein:

[0025] Figure 1It is the overall elevation layout drawing for the construction of steel girders by the incremental launching method;

[0026] Figure 2 It is the overall cross-section layout drawing for the construction of steel girders by the incremental launching method;

[0027] Figure 3 It is Figure 2 The large-scale drawing of the steel bars of the concrete anti-collision guardrail constructed by the traditional incremental launching method in

[0028] Figure 4 It is Figure 2 The large-scale drawing of the steel bars of the concrete anti-collision guardrail constructed by the incremental launching method of the present invention in

[0029] Figure 5 It is Figure 2 The large-scale drawing of the installation of the anti-throwing net in

[0030] Figure 6 It is Figure 5 Large-scale drawing No. 1 in

[0031] Figure 7 It is Figure 5 Large-scale drawing No. 1 in Specific implementation manners

[0032] The features of the present invention and other related features are further described in detail below with reference to the accompanying drawings through embodiments for the understanding of those skilled in the same industry:

[0033] As shown in Figures 1 - 7 , the marks 1-14 in the figure are respectively: 1 - continuous steel structure beam, 2 - bridge pier, 3 - anti-collision guardrail, 4 - anti-throwing net, 5 - temporary incremental launching support, 6 - steel guide beam, 7 - incremental launching device, 8 - ordinary steel bars of the anti-collision guardrail, 9 - reinforced steel bars of the anti-collision guardrail, 10 - anti-throwing net support, 11 - anti-throwing net frame, 12 - anti-throwing net mesh, 13 - circular bolt holes of the anti-throwing net, 14 - oval bolt holes of the anti-throwing net, 15 - embedded steel plate.

[0034] Embodiment: As shown in Figures 1 - 2As shown in the figure, this embodiment provides a steel structure bridge using full-bridge integrated jacking method across busy traffic arteries such as highways / railways, and its construction method. The bridge structure consists of a steel structure continuous beam 1, piers 2, and related accessory structures such as anti-collision guardrails 3 and anti-throwing nets 4. The steel structure continuous beam 1 is supported on the piers 2. Anti-collision guardrails 3 are arranged on both sides of the steel structure continuous beam 1, and anti-throwing nets 4 are arranged on the top surfaces of the anti-collision guardrails. The anti-throwing net 4 consists of an anti-throwing net support 10, an anti-throwing net frame 11, an anti-throwing net mesh 12, etc. A pre-embedded steel plate 15 with a thickness of 20 mm is arranged on the top of the anti-collision guardrail, and the anti-throwing net support is welded to the pre-embedded steel plate on the top surface of the anti-collision guardrail. The anti-throwing net 4 is welded and fixed on the pre-embedded steel plate 15 on the top surface of the anti-collision guardrail 3 through the anti-throwing net support 10.

[0035] Since the bridge spans busy traffic arteries such as highways / railways, the jacking construction method is generally adopted to reduce the impact of bridge construction on the traffic arteries under the bridge. The construction machinery and equipment of the jacking method generally consists of a temporary jacking support 5, a steel guide beam 6, and a jacking device 7. As Figures 1 - 2 shown, during the jacking process, the steel structure bridge using full-bridge integrated jacking includes the steel box girder segments to be jacked, the anti-collision guardrails 3 arranged on both sides of the steel box girder segments, and the anti-throwing nets 4 arranged on the top surfaces of the anti-collision guardrails 3. A steel guide beam 6 is arranged in front of the steel box girder segments, and a jacking device 7 and a jacking support 5 are arranged under the steel box girder segments.

[0036] In the traditional jacking construction of steel structure bridges, the main structure of the bridge - the steel structure continuous beam 1 is first jacked in place by jacking equipment, and then the bridge deck accessory facilities - the anti-collision guardrail 3 and the anti-throwing net 4 are constructed on the bridge deck.

[0037] Figure 3 is the detailed drawing of the structural reinforcement of the subsequent constructed bridge deck accessory facility - the anti-collision guardrail 3 after the traditional steel structure continuous beam 1 is jacked. Since the anti-collision guardrail is constructed after the main structure is completed, the structural self-weight is borne by the main structure, and only a small amount of ordinary anti-collision guardrail steel bars 8 with a diameter of about 10 mm need to be configured on the top surface of the anti-collision guardrail.

[0038] Figure 5 、 Figure 6 is the detailed installation drawing of the accessory facility - the anti-throwing net 4 on the traditional steel structure continuous beam 1. The anti-throwing net frame 11 and the anti-throwing net support 10 are connected by bolts. The bolt holes are circular bolt holes 13, and the diameter φD matches the corresponding bolt specification. For example, for an M12 bolt, the bolt hole diameter φD = 14 mm. In the figure, H is the height of the anti-throwing net, and B is the width of a single anti-throwing net frame.

[0039] The traditional jacking construction method of steel structure bridges is as follows:

[0040] A. Set up temporary jacking supports along the bridge line;

[0041] B. Install the first - segment steel box girder;

[0042] C. Install the jacking steel guide girder and the jacking device;

[0043] D. Jack the first - segment steel box girder to complete the first jacking;

[0044] E. Install the second - segment steel box girder;

[0045] F. Jack the second - segment steel box girder to complete the second jacking;

[0046] G. Repeat steps E and F until the steel box girder is jacked in place;

[0047] H. Demolish the temporary jacking support 5, the steel guide girder 6 and the jacking device 7 to complete the jacking construction;

[0048] I. Pour the concrete anti - collision guardrail 3 for the whole bridge;

[0049] J. Install the anti - throwing net 4 for the whole bridge.

[0050] This method is relatively simple in construction, which can ensure that the main structure quickly and safely crosses busy traffic arteries such as highways / railways. However, during the construction of the bridge deck auxiliary facilities, there is a certain impact on the traffic under the bridge, specifically including the following aspects:

[0051] 1. When installing and demolishing the formwork of the anti - collision guardrail, there is a risk of formwork falling from height, which affects the traffic under the bridge;

[0052] 2. When pouring the concrete anti - collision guardrail, there is a risk of concrete leakage, which affects the traffic under the bridge;

[0053] 3. When welding the anti - throwing net column to the embedded steel plate on the top surface of the anti - collision guardrail, there are risks of the column falling from height and welding slag splashing, which affect the traffic under the bridge;

[0054] 4. When connecting the anti - throwing net frame and the anti - throwing net mesh to the anti - throwing net column with bolts, there is a risk of falling objects from height, which affects the traffic under the bridge.

[0055] Considering the above - mentioned impacts, in traditional jacking construction, although it can ensure zero interference with the traffic artery under the bridge during the construction of the bridge main structure, during the construction of the bridge deck auxiliary facilities in the later stage, there are still many construction risks of falling objects from height above the traffic artery, and it is impossible to ensure zero interference with the traffic artery throughout the bridge construction process.

[0056] This embodiment provides a steel structure bridge with integral jacking for the whole bridge and its construction method. During the jacking of the steel - structure continuous beam 1, which is the main structure of the bridge, the bridge deck auxiliary facilities such as the anti - collision guardrail and the anti - throwing net are jacked across busy traffic arteries such as highways / railways synchronously with the main structure at one time.

[0057] Figure 4 This is the detailed drawing of the structural steel bars of the anti-collision guardrail 3 of the present invention. Six anti-collision guardrail reinforcement bars 9 with a diameter of 28 - 32 mm are arranged at the top of the bridge anti-collision guardrail, which are used to bear the negative bending moment during the jacking of the anti-collision wall.

[0058] Figure 5 、 Figure 7 This is the detailed drawing of the installation of the anti-throwing net and the bolt holes of the present invention. The anti-throwing net support 10 is welded to the embedded steel plate 15 on the top surface of the anti-collision guardrail 3. The anti-throwing net sheet 12 is welded to the anti-throwing net frame 11. The anti-throwing net frame 11 is bolted to the anti-throwing net support 10. The bolt holes are arranged as oval bolt holes 14 along the bridge jacking direction to adapt to the deformation of the anti-throwing net during jacking. The horizontal major axis length of the oval bolt hole 14 is D + ΔD, and the vertical minor axis length is D, where D matches the corresponding bolt specification. For example, for an M12 bolt, the bolt hole diameter φD = 14 mm; ΔD ≥ H·θ, where H is the height of the anti-throwing net, generally about 2 - 3 m, and θ is the maximum angular deformation of the continuous steel structure beam 1 during jacking, which is obtained by calculation and analysis of the jacking construction process.

[0059] The integrated jacking construction technology of the steel structure bridge involved in the present invention has the following specific construction methods:

[0060] A. Set up temporary jacking supports along the bridge alignment;

[0061] B. Install the first segment of the steel box girder;

[0062] C. Pour the concrete anti-collision guardrails on both sides of the first segment of the steel box girder;

[0063] D. Install the first segment of the anti-throwing net;

[0064] E. Install the jacking steel guide beam and the jacking device;

[0065] F. Jack the first segment of the steel box girder to complete the first jacking;

[0066] G. Install the second segment of the steel box girder;

[0067] H. Pour the concrete anti-collision guardrails on both sides of the second segment of the steel box girder;

[0068] I. Install the second segment of the anti-throwing net;

[0069] J. Jack the second segment of the steel box girder to complete the second jacking;

[0070] K. Repeat the procedures of G, H, I, and J until the steel box girder is jacked in place;

[0071] L. Remove the temporary jacking supports, the steel guide beam, and the jacking device to complete the jacking construction.

[0072] The present invention completely overcomes the drawback that traditional incremental launching construction cannot ensure zero interference with busy traffic arteries throughout the whole process of bridge construction. It synchronously launches the bridge deck auxiliary facilities and the main bridge structure across busy traffic arteries such as highways / railways at one time, without the construction risk of subsequent high-altitude falling objects above the traffic arteries, ensuring that the bridge quickly and safely crosses busy traffic arteries such as highways / railways, and realizing zero interference with traffic arteries throughout the whole process of construction.

Claims

1. A steel structure bridge with integrated full-bridge incremental launching, characterized in that the bridge adopts a continuous steel structure beam, on which there are bridge deck accessory facilities including anti-collision guardrails and anti-throwing nets. The anti-collision guardrails are arranged on both sides of the continuous steel structure beam, and the anti-throwing nets are arranged on the top surface of the anti-collision guardrails. During the incremental launching of the bridge, the bridge deck accessory facilities including anti-collision guardrails and anti-throwing nets are launched together with the main bridge steel structure; the anti-throwing net includes an anti-throwing net support, an anti-throwing net mesh and an anti-throwing net frame. The anti-throwing net mesh is connected to the anti-throwing net frame by welding, and the anti-throwing net frame is connected to the anti-throwing net support by bolts. The anti-throwing net is fixed on the top surface of the anti-collision guardrail through the anti-throwing net support; ear plates are provided on the sides of the anti-throwing net support and the anti-throwing net frame, and bolt holes are provided on the ear plates. The bolt holes are arranged as oval holes along the incremental launching direction of the bridge to adapt to the deformation of the anti-throwing net during incremental launching.

2. A steel structure bridge with integrated full-bridge incremental launching according to claim 1, characterized in that reinforcing bars are arranged at the top of the anti-collision guardrail to bear the negative bending moment during the incremental launching of the anti-collision wall.

3. A steel structure bridge with integrated full-bridge incremental launching according to claim 1, characterized in that embedded steel plates are arranged at the top of the anti-collision guardrail, and the anti-throwing net support is welded to the embedded steel plate on the top surface of the anti-collision guardrail.

4. A construction method of a steel structure bridge with integrated full-bridge incremental launching according to claim 1, characterized in that the construction method includes the following steps: A. Erect temporary incremental launching supports along the bridge; B. Install the first segment of steel box girder; C. Pour the concrete anti-collision guardrails on both sides of the first segment of steel box girder; D. Install the anti-throwing net of the first segment; E. Install the incremental launching steel guide beam and incremental launching device; F. Incrementally launch the first segment of steel box girder to complete the first incremental launching; G. Install the second segment of steel box girder; H. Pour the concrete anti-collision guardrails on both sides of the second segment of steel box girder; I. Install the anti-throwing net of the second segment; J. Incrementally launch the second segment of steel box girder to complete the second incremental launching; K. Repeat the processes of G, H, I, and J until the steel box girder is incrementally launched in place; L. Remove the temporary incremental launching supports, steel guide beam and incremental launching device to complete the incremental launching construction.

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