Dynamic support structure of steel bridge of movable pontoon

Abstract

The present invention relates to the field of port and waterway engineering technology, and discloses a dynamic support structure of a movable pontoon steel bridge, wherein two support legs are arranged at the bottom of one end of the steel bridge, and an arched box is arranged at the bottom of the other end of the steel bridge, and the lower surface of the arched box is a lower arch, and the arched box is located on the pontoon. The dynamic support structure of the movable pontoon steel bridge of the present invention can greatly reduce or even eliminate the torsional load on the bridge body when the supporting planes at both ends of the steel bridge are not parallel, and ensure that the steel bridge can work safely and reliably in various complex working environments.

Description

Technical Field

[0001] The invention relates to the technical field of port and waterway engineering, and in particular to a dynamic supporting structure of a movable pontoon steel bridge. Background Art

[0002] Mobile pontoons are widely used in various ports and docks. The front line of the dock is located at a position that meets the designed draft depth of the ship under the designed low water level condition. The pontoon is tightened and fixed by iron chains and can rise and fall at the same position as the water level rises and falls, thereby always keeping the front line of the dock unchanged.

[0003] Steel bridges are usually required between pontoons and shores, and between pontoons to meet the needs of dock loading and unloading operations and personnel circulation. When engineering and technical personnel refer to relevant design specifications and design the structure of steel bridges, the first thing they check is the vertical bearing capacity of the steel bridges, while the torsional resistance of the steel bridges is often not checked too much.

[0004] At inland river terminals, water flow fluctuations are small, and the torsional load on the steel bridge caused by the ups and downs of the pontoons is not large, usually not reaching the level of damaging the bridge body. However, at some seaport terminals with huge winds and waves, or in special disaster situations such as floods, the asynchronous fluctuations of the movable pontoons will cause the steel bridge to be subjected to huge torsional loads, which can easily cause the steel bridge to be damaged.

[0005] At present, the support form of steel bridges is basically a support form with two symmetrical legs at each end of the bridge, with a total of four support points. When the pontoon deflects laterally, due to the angle between the two connected pontoons or the layout plane of the pontoon and the shore, only three of the four legs play a supporting role, resulting in the steel bridge being subjected to torsional loads. When this torsional load is too large or occurs in a long-term cycle, it is very easy to cause overload damage or fatigue damage to the structure of the steel bridge. Summary of the invention

[0006] The purpose of the present invention is to address the deficiencies of the above-mentioned technology and provide a dynamic support structure for a movable pontoon steel bridge, which can greatly reduce or even eliminate the torsional load on the bridge body when the supporting planes at both ends of the steel bridge are not parallel, thereby ensuring that the steel bridge can work safely and reliably in various complex working environments.

[0007] To achieve the above-mentioned purpose, the present invention designs a dynamic support structure of a movable pontoon steel bridge, wherein two supporting legs are arranged at the bottom of one end of the steel bridge, and an arched box is arranged at the bottom of the other end of the steel bridge, and the lower surface of the arched box is a lower arch, and the arched box is located on the pontoon.

[0008] Preferably, anti-overturning legs are arranged at both ends of the arched box body, and the bottom height of the anti-overturning legs is higher than the height of the lowest point of the arched box body, so as to ensure the stability of the steel bridge in strong winds and waves.

[0009] Preferably, the anti-capsize legs are provided with a hydraulic telescopic device for adjusting the length of the anti-capsize legs, and when the two anti-capsize legs are in the maximum extended state of the hydraulic telescopic device, the lowest point of the arch box is separated from the pontoon, and when the two anti-capsize legs are in the minimum extended state of the hydraulic telescopic device, the inclination angle of the steel bridge does not capsize.

[0010] Preferably, the bottom of the anti-overturning leg is provided with an arc on the inner side, and a leg anti-collision rubber layer is installed to ensure the reliability of the anti-overturning function and reduce the impact force when the anti-overturning leg is in effect.

[0011] Preferably, an arched surface rubber layer is installed on the arched surface of the arched box body, which can increase the supporting area and improve stability on the one hand, and increase the friction between the steel bridge and the pontoon in the direction of the bridge span on the other hand, thereby ensuring the stability of the arrangement position of the steel bridge.

[0012] Preferably, a plurality of longitudinal reinforcing ribs are provided in the arched box body to ensure the strength of the arched box body.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] 1. Compared with the traditional four-leg support form, it can effectively reduce the torsional load on the steel bridge when the pontoon is swaying due to wind and waves, greatly improving the reliability and wind and wave resistance of the steel bridge;

[0015] 2. At the same time, the anti-overturning legs are extended to meet the requirements for stable operation of the bridge under conditions of small winds and waves. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the layout of the dynamic support structure of the steel bridge of the movable pontoon of the present invention;

[0017] Figure 2 for Figure 1 Side view of

[0018] Figure 3 It is a schematic diagram of the working state when the anti-overturning legs are extended;

[0019] Figure 4 Schematic diagram of the ultimate tilt state of the steel bridge after the anti-overturning legs are retracted.

[0020] The components in the figure are numbered as follows:

[0021] Steel bridge 1, supporting legs 2, arched box 3, pontoon 4, anti-overturning legs 5, hydraulic telescopic device 6, leg anti-collision rubber layer 7, arch surface rubber layer 8, and reinforcing ribs 9. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1 and Figure 2 As shown, the dynamic support structure of the movable pontoon steel bridge of the present invention has two supporting legs 2 arranged at the bottom of one end of the steel bridge 1, and an arched box 3 is arranged at the bottom of the other end of the steel bridge 1. The lower surface of the arched box 3 is a lower arch, and the arched box 3 is located on the pontoon 4.

[0024] Among them, anti-overturning legs 5 are arranged at both ends of the arched box 3, and the bottom height of the anti-overturning legs 5 is higher than the height of the lowest point of the arched box 3 to ensure the stability of the steel bridge 1 during strong winds and waves. The bottom of the anti-overturning legs 5 is provided with an arc on the inner side, and a leg anti-collision rubber layer 7 is installed to ensure the reliability of the anti-overturning function and reduce the impact force when the anti-overturning legs 5 are in effect.

[0025] In addition, a hydraulic telescopic device 6 for adjusting the length of the anti-capsize legs 5 is provided on the anti-capsize legs 5. When the two anti-capsize legs 5 are in the maximum extended state of the hydraulic telescopic device 6, the lowest point of the arch box 3 is separated from the pontoon 4. When the two anti-capsize legs 5 are in the minimum extended state of the hydraulic telescopic device 6, the inclination angle of the steel bridge 1 does not capsize.

[0026] In this embodiment, an arched surface rubber layer 8 is installed on the arched surface of the arched box body 3, which can increase the support area and improve stability on the one hand, and increase the friction between the steel bridge 1 and the pontoon 4 in the span direction on the other hand, ensuring the layout position stability of the steel bridge 1. A plurality of longitudinal reinforcing ribs 9 are arranged in the arched box body 3 to ensure the strength of the arched box body 3.

[0027] The principle of this embodiment is that the lower arch type is used to form a contact support with the pontoon 4. When the pontoon 4 shakes, the support point can be kept near the cross-sectional center line of the steel bridge 1, and a stable three-point support form is formed with the two conventional support legs 2 at the other end of the steel bridge 1, effectively reducing the torsional load of the steel bridge 1 caused by the shaking of the pontoon 4.

[0028] When this embodiment is used, in the case of no wind or small waves, Figure 3 As shown, the hydraulic expansion and contraction device 6 is driven to extend the anti-overturning legs 5 on both sides and support the steel bridge 1 to form a stable four-point support to ensure the stability of the bridge deck during operation. In strong winds and waves, the steel bridge 1 stops working. Figure 4As shown, driven by the anti-overturning legs 5, the anti-overturning legs 5 are retracted, so that the bottom surface of the arched box body 3 directly supports the steel bridge 1, thereby reducing the torsional load on the steel bridge 1.

[0029] Compared with the traditional four-leg support form, the dynamic support structure of the movable pontoon steel bridge of the present invention can greatly reduce or even eliminate the torsional load on the bridge body when the supporting planes at both ends of the steel bridge 1 are not parallel, thereby ensuring that the steel bridge 1 can work safely and reliably in various complex working environments, improving the application scope and life cycle of the steel bridge 1, and having good engineering application prospects and economic value.

Claims

1. A dynamic support structure of a movable pontoon steel bridge, wherein two supporting legs (2) are arranged at the bottom of one end of the steel bridge (1), and the structure is characterized in that: An arched box body (3) is arranged at the bottom of the other end of the steel bridge (1), the lower surface of the arched box body (3) is a lower arch, and the arched box body (3) is located on the pontoon (4); Anti-overturning legs (5) are arranged at both ends of the arched box (3). The bottom of the anti-overturning legs (5) is provided with an arc on the inner side and is installed with a leg anti-collision rubber layer (7). The anti-overturning legs (5) are provided with a hydraulic telescopic device (6) for adjusting the length of the anti-overturning legs (5). When the two anti-overturning legs (5) are in the maximum extended state of the hydraulic telescopic device (6), the lowest point of the arched box (3) is separated from the pontoon (4). When the two anti-overturning legs (5) are in the minimum extended state of the hydraulic telescopic device (6), the bottom height of the anti-overturning legs (5) is higher than the height of the lowest point of the arched box (3), so that the inclination angle of the steel bridge (1) does not overturn; In the case of no wind or waves or small wind and waves, the hydraulic telescopic device (6) drives the anti-overturning legs (5) on both sides to extend and support the steel bridge (1), forming a stable four-point support to ensure the stability of the bridge deck during operation; in the case of strong winds and waves, the steel bridge (1) stops operating and is driven by the hydraulic telescopic device (6) to retract the anti-overturning legs (5), so that the bottom surface of the arch box (3) directly supports the steel bridge (1), thereby reducing the torsional load on the steel bridge (1).

2. The dynamic support structure of the movable pontoon steel bridge according to claim 1 is characterized in that: An arched surface rubber layer (8) is installed on the arched surface of the arched box body (3).

3. The dynamic support structure of the movable pontoon steel bridge according to claim 1 is characterized in that: A plurality of longitudinal reinforcing ribs (9) are arranged inside the arched box body (3).

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