Temporary support dismantling method for bridge construction

Abstract

The invention discloses a bridge construction temporary support dismantling method, which belongs to the technical field of bridge construction, and comprises the following steps: S1, arranging a traction mechanism, and connecting the execution end of the traction mechanism to an upper component; s2, at least part of the connecting structure is removed, and the height of the adjustable temporary support is adjusted, so that at least one side of the upper component is separated from the lower foundation; s3, traction force is applied to the upper component through a traction mechanism, meanwhile, the height of the adjustable temporary support is cooperatively controlled, and the upper component overturns towards the ground along the preset dumping side in a controlled mode; and S4, after the upper component overturns to the ground or the position close to the ground, the temporary support is disassembled. In conclusion, according to the dismantling method provided by the invention, the traction mechanism is introduced and cooperatively works with the adjustable temporary support, so that safe and controllable overturning dismantling of the temporary support is realized.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a method for dismantling temporary supports during bridge construction. Background Technology

[0002] In bridge construction, temporary scaffolding is an important temporary facility used to support the bridge structure during construction. Once the main bridge structure is completed, the temporary scaffolding needs to be dismantled.

[0003] Traditional methods for dismantling temporary scaffolding typically involve workers first removing bolts and rods from heights, and then using simple lifting equipment to hoist and dismantle the components.

[0004] However, existing methods for dismantling temporary supports are inefficient, time-consuming and labor-intensive for workers to work at heights, and the dismantling process is unsafe, with workers facing risks such as falls and being struck by objects. In addition, the dismantling process is poorly adaptable to weather conditions, and manual high-altitude work is greatly affected by rain and strong winds, which can easily delay the project schedule. Summary of the Invention

[0005] The purpose of this invention is to provide a method for dismantling temporary supports during bridge construction, so as to solve the technical problems of low efficiency, poor safety and insufficient adaptability of the existing temporary support dismantling methods.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A method for dismantling temporary scaffolding during bridge construction is provided for removing temporary scaffolding after bridge construction is completed. The temporary scaffolding includes a lower foundation and an upper component, the upper component and the lower foundation being connected by a connecting structure, and an adjustable temporary support being provided between the upper component and the lower foundation. Specifically, the method for dismantling temporary scaffolding during bridge construction includes:

[0008] S1: Set up a traction mechanism and connect the execution end of the traction mechanism to the upper component;

[0009] S2: Release at least part of the connection structure, adjust the height of the adjustable temporary support, and separate at least one side of the upper component from the lower foundation;

[0010] S3: The traction mechanism applies traction force to the upper component and simultaneously controls the height of the adjustable temporary support, so that the upper component tilts to the ground in a controlled manner along the preset tilting side;

[0011] S4: After the upper component tilts to or near the ground, the temporary support is dismantled.

[0012] Preferably, the traction mechanism includes a winch, a fixed pulley, and a wire rope; the actuating end is the free end of the wire rope.

[0013] In step S1, the fixed pulley is fixed to the main body of the bridge, and after the wire rope passes through the fixed pulley, one end of the wire rope is connected to the output end of the winch, and the other end is connected to the upper component.

[0014] Preferably, the connection positions of the wire rope and the fixed pulley and the connection positions of the wire rope and the upper component are located on the same horizontal straight line.

[0015] Preferably, the adjustable temporary support is a sand bucket support, and the inside of the sand bucket support is filled with sand as a pressure-bearing medium.

[0016] In S2, the height of the upper component is reduced by releasing sand from the sand bucket support, so that at least one side of the upper component is separated from the lower foundation.

[0017] Preferably, four sand bucket supports are provided, located at the four corners between the upper component and the lower foundation;

[0018] In step S2, sand particles are first released from the sand bucket supports located diagonally opposite each other.

[0019] Preferably, after the sand bucket support is released, a jack is installed at the corresponding position. The jack is used to provide auxiliary support and fine-tuning of the height during the overturning process of the support.

[0020] Preferably, in step S3, the jack located away from the preset tilting side is controlled to lift the upper component upward, so that the upper component tilts along the preset tilting side.

[0021] Preferably, the connection structure includes a support plate, a fixing bolt, and a fixing nut. The support plates are respectively disposed on the bottom surface of the upper component and the top surface of the lower foundation. The two support plates are joined together, and the fixing bolt passes through the two support plates in sequence and is locked by the fixing nut.

[0022] Preferably, multiple connection structures are provided, located at the four corners between the upper component and the lower foundation;

[0023] In S2, only the fixing nuts of the connection structure that are away from the preset tilting side are released;

[0024] In step S3, the upper component rotates and tilts around the fixed bolt on the preset tilting side as a pivot.

[0025] Preferably, the bottom of the subbase is provided with a roadbed box plate.

[0026] The beneficial effects of this invention are:

[0027] The bridge construction temporary support dismantling method proposed in this invention first connects the execution end of the traction mechanism to the upper component, forming a preliminary safety constraint. After partially disconnecting the connection structure, the height of the adjustable temporary support is adjusted to separate one side of the upper component from the lower foundation, thus naturally forming a tilting tendency under gravity. At this time, the traction mechanism applies a traction force in the preset tilting direction of the upper component to actively intervene and buffer the tilting process caused by the height of the adjustable temporary support's descent and the shift in the center of gravity. By real-time coordinated control of the magnitude of the traction force and the descent speed of the adjustable temporary support, the upper component can be effectively guided to tilt slowly and smoothly along the preset tilting side, avoiding sudden collapse or impact with the ground and surrounding structures after instability. This method transforms traditional high-altitude dismantling operations into a controlled tilting process mainly based on ground operations, reducing the amount of high-altitude work and high-risk manual operations, and improving the overall safety of the dismantling operation. Meanwhile, mechanized and procedural collaborative control reduces reliance on manual experience and physical labor, making the demolition process more efficient and coherent, and less affected by inclement weather, thereby enhancing the reliability of the construction method and the controllability of the construction period. Finally, the components are dismantled after being tilted to the ground or at a low altitude, fundamentally improving working conditions and further ensuring personnel safety and operational efficiency. Attached Figure Description

[0028] Figure 1 This is a front view of the temporary support provided in an embodiment of the present invention;

[0029] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0030] Figure 3 This is a side view of the temporary support provided in an embodiment of the present invention;

[0031] Figure 4 yes Figure 3 Enlarged view of point B in the middle;

[0032] Figure 5 This is a first schematic diagram of the method for dismantling temporary supports for bridge construction provided in an embodiment of the present invention;

[0033] Figure 6 This is a second schematic diagram of the method for dismantling temporary supports for bridge construction provided in an embodiment of the present invention;

[0034] Figure 7 This is a first top view of the temporary support provided in an embodiment of the present invention;

[0035] Figure 8 This is a second top view of the temporary support provided in an embodiment of the present invention;

[0036] Figure 9 This is a third top view of the temporary support provided in an embodiment of the present invention.

[0037] In the picture:

[0038] 100. Temporary support; 101. Substructure; 102. Superstructure; 103. Uprights; 104. Web members; 105. Subgrade box girder; 200. Bridge main body;

[0039] 1. Connecting structure; 11. Support plate; 12. Fixing bolts; 13. Fixing nuts;

[0040] 2. Adjustable temporary support; 21. Sand bucket support;

[0041] 3. Traction mechanism; 31. Winch; 32. Fixed pulley; 33. Wire rope;

[0042] 4. Jack. Detailed Implementation

[0043] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0044] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0047] like Figure 1-9 As shown, the bridge construction temporary support removal method provided in this embodiment of the invention is used to remove the temporary support 100 after bridge construction is completed. The temporary support 100 includes a lower foundation 101 and an upper component 102. The upper component 102 and the lower foundation 101 are connected by a connecting structure 1, and an adjustable temporary support 2 is provided between the upper component 102 and the lower foundation 101. The method includes:

[0048] Once the main bridge structure 200 is completed and reaches its design strength, the temporary scaffolding 100 can be dismantled. Before construction, a survey and preparation of the temporary scaffolding 100 and the surrounding site are required.

[0049] The temporary support 100 includes a lower foundation 101 constructed of steel sections or steel pipes, and an upper component 102 supported thereon. Both the lower foundation 101 and the upper component 102 are composed of components such as uprights 103 and web members 104.

[0050] To increase the contact area, disperse pressure, and prevent uneven settlement, a roadbed box slab 105 is laid at the bottom of the lower foundation 101. The upper component 102 is fixedly connected to the lower foundation 101 through a connecting structure 1. At the same time, an adjustable temporary support 2 is provided between the two to bear the construction load and facilitate later adjustment.

[0051] In this embodiment, the connecting structure 1 specifically includes support plates 11 welded to the bottom surface of the upper component 102 and the top surface of the lower foundation 101 respectively. After the two support plates 11 are spliced ​​together, the fixing bolts 12 pass through the reserved holes of the two in sequence and are locked by tightening the fixing nuts 13.

[0052] To provide a stable connection, multiple connection structures 1 are provided, preferably located at the four corners between the upper component 102 and the lower foundation 101.

[0053] The implementation of this method begins with meticulous preparation before construction. Workers must conduct a comprehensive inspection of all equipment and components, including the winch 31, fixed pulley 32, wire rope 33, jack 4, sand bucket support 21, and all connecting parts, to ensure their integrity and reliability meet safety requirements. In particular, the sand in the sand bucket support 21 must be evenly and densely packed, the wire rope 33 must be free of broken strands, rust, or other defects, and all connections must be secure.

[0054] When the demolition work begins, S1: Set up the traction mechanism 3 and connect its execution end to the upper component 102.

[0055] In this embodiment, the traction mechanism 3 includes a winch 31, a fixed pulley 32, and a wire rope 33. In operation, the winch 31 is placed at the bridgehead or other safe, easily accessible, and solid ground. Then, a secure anchor point is selected, such as a suitable location on the completed bridge main structure 200, and the fixed pulley 32 is reliably fixed thereto. Next, the wire rope 33 is wound around the fixed pulley 32. One end of the wire rope 33, the power end, is connected to the output end of the winch 31, and the other end of the wire rope 33, the free end, which in this embodiment constitutes the actuating end, is connected to the upper component 102.

[0056] To ensure a clear direction of traction and reduce unnecessary lateral forces, the connection points of wire rope 33 and fixed pulley 32, and wire rope 33 and upper component 102, should be on the same horizontal straight line. The connection point between wire rope 33 and upper component 102 should be selected in a location with sufficient strength, typically at the top or upper side of upper component 102, and a reliable shackle or clamp should be used for connection.

[0057] S2: Disconnect at least part of the connecting structure 1 and adjust the height of the adjustable temporary support 2 so that at least one side of the upper component 102 is separated from the lower foundation 101.

[0058] The connecting structure 1 includes a support plate 11, fixing bolts 12, and fixing nuts 13. Preferably, the support plates 11 are wedge-shaped steel plates, which are arranged in pairs and fixed to the bottom surface of the upper component 102 and the top surface of the lower foundation 101, respectively, and the two support plates 11 are spliced ​​together. The fixing bolts 12 pass vertically through the two support plates 11 in sequence and are locked by the fixing nuts 13, thereby firmly connecting the upper component 102 and the lower foundation 101. To ensure stability, multiple connecting structures 1 are provided, usually arranged at the four corners of the connection area between the upper component 102 and the lower foundation 101.

[0059] During the dismantling operation, the operator first disconnects part of the connecting structure 1. Specifically, the operator first uses tools to disconnect only the fixing nuts 13 of the connecting structure 1 away from the preset tilting side, and removes the corresponding fixing bolts 12, while keeping the fixing bolts 12 and fixing nuts 13 of the connecting structure 1 on the preset tilting side in a locked state.

[0060] Meanwhile, the adjustable temporary support 2 is operated. In this embodiment, the adjustable temporary support 2 is a sand bucket support 21, which is filled with sand as a pressure-bearing medium. Typically, four sand bucket supports 21 are provided, located at the four corners between the upper component 102 and the lower foundation 101.

[0061] The specific operation of adjusting the height of the sand bucket support 21 mainly involves releasing the sand particles inside the sand bucket support 21 to reduce its height. As a preferred sequential control strategy, the sand particles in the sand bucket supports 21 located diagonally can be released first. By opening the sand discharge valve at the bottom of the sand bucket or using other controllable methods to allow the sand particles to flow out slowly, the support height is reduced accordingly. This causes the upper component 102 to begin separating from the lower foundation 101 on the side where the sand particles are released, creating an initial tilting tendency.

[0062] After the sand bucket support 21 is released, a jack 4 is set at the corresponding position. Usually, the jack 4 is set near the original support point of the released sand bucket support 21. The base of the jack 4 is placed on the lower foundation 101, and the lifting head of the jack 4 contacts the bottom surface of the upper component 102 and applies a certain pre-lifting force.

[0063] S3: The upper component 102 is subjected to traction force by the traction mechanism 3, and the height of the adjustable temporary support 2 is controlled in a coordinated manner so that the upper component 102 tilts to the ground in a controlled manner along the preset tilting side.

[0064] During this process, the winch 31 is operated to keep the wire rope 33 taut, providing necessary safety restraint. The overturning is mainly caused by gravity. By coordinating the lifting or retraction of the jacks 4 located at different positions, the tilting process of the upper component 102 can be precisely controlled.

[0065] Specifically, the jack 4 located away from the preset tilting side can be controlled to lift the upper component 102 upwards, which will further increase the height difference between the two sides of the upper component 102, causing the upper component 102 to more clearly begin to rotate and tilt with the preset tilting side as the rotation side. At this time, the upper component 102 is actually rotating and tilting with the fixing bolt 12, which is still locked on the preset tilting side, as the pivot.

[0066] Understandably, the fixing bolt 12 plays a dual role in this process, serving as a connector during the construction phase and transforming into a physical rotational hinge during the dismantling phase. This ensures that the overturning motion is a controllable rotation around the axis rather than an unpredictable slippage, thus improving safety.

[0067] Throughout the overturning process, the operator can precisely control the overturning angle and falling speed of the upper component 102 by adjusting the traction speed of the winch 31, the release rate of the sand particles, and the lifting stroke of the jack 4 in real time and synchronously, thereby achieving its controlled overturning to the ground along the preset overturning side.

[0068] S4: After the upper component 102 has overturned to or is close to the ground, the temporary support 100 is dismantled.

[0069] Once the upper component 102 has tilted to a safe position near or to the ground under controlled conditions, its supporting function for the bridge main body 200 has been completely released, and its height has been significantly reduced. At this point, operators use conventional tools such as gas cutting equipment and wrenches to remove all remaining connecting structures 1, including fixing bolts 12 and nuts that serve as pivots, support plates 11, emptied sand bucket supports 21, and auxiliary tools such as jacks 4. Subsequently, the uprights 103, web members 104, and other members can be disassembled one by one and transported away from the site using transport equipment. The bottom-level roadbed box slab 105 and other reusable components can be recycled after cleaning for subsequent projects.

[0070] In summary, the bridge construction temporary support dismantling method provided by the embodiments of the present invention transforms the traditional high-altitude piece-by-piece dismantling into a ground-controlled, overall overturning operation mode through the above specific implementation methods.

[0071] Through the traction system consisting of a winch 31, a fixed pulley 32, and a wire rope 33, in coordination with the adjustable temporary support 2 (sand bucket support 21), and combined with the design using a fixed bolt 12 as a pre-set pivot, active and precise control of the tilting direction, angle, and speed of the massive support structure is achieved. This transforms the dismantling process from an uncontrollable, high-altitude risk operation into a predictable and adjustable ground-controlled operation, thereby improving dismantling efficiency and shortening the overall construction period compared to traditional manual high-altitude dismantling methods.

[0072] Furthermore, this method fundamentally reduces the time and frequency of direct operations for personnel in dangerous high-altitude areas and under the overturned structure. The main operations of this method, such as controlling the winch 31, releasing sand, and adjusting the jacks 4, can all be completed on the ground or at a safe distance, reducing the risk of accidents such as falls and being struck by objects. Simultaneously, the rotational overturning method using the fixing bolt 12 as the pivot avoids slippage or instantaneous collapse of the upper component 102, improving the controllability and safety of the entire demolition process.

[0073] In addition, this method reduces reliance on large, specialized lifting equipment, and the main equipment and materials can be recycled, effectively reducing the investment in mechanical equipment and the overall construction cost while ensuring construction quality and safety.

[0074] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for dismantling temporary supports during bridge construction, used to dismantle temporary supports (100) after bridge construction is completed, wherein the temporary supports (100) include a lower foundation (101) and an upper component (102), the upper component (102) and the lower foundation (101) are connected by a connecting structure (1), and an adjustable temporary support (2) is provided between the upper component (102) and the lower foundation (101), characterized in that, The method for dismantling temporary scaffolding during bridge construction includes: S1: Set up a traction mechanism (3) and connect the execution end of the traction mechanism (3) to the upper component (102). S2: Release at least part of the connection structure (1), adjust the height of the adjustable temporary support (2), and separate at least one side of the upper component (102) from the lower foundation (101); S3: The upper component (102) is subjected to traction force by the traction mechanism (3), and the height of the adjustable temporary support (2) is controlled in coordination, so that the upper component (102) tilts to the ground in a controlled manner along the preset tilting side; S4: After the upper component (102) tilts to the ground or close to the ground, the temporary support (100) is dismantled.

2. The method for dismantling temporary supports for bridge construction according to claim 1, characterized in that, The traction mechanism (3) includes a winch (31), a fixed pulley (32), and a wire rope (33); the actuating end is the free end of the wire rope (33); In S1, the fixed pulley (32) is fixed to the bridge body (200), and after the wire rope (33) passes through the fixed pulley (32), one end of the wire rope (33) is connected to the output end of the winch (31), and the other end is connected to the upper component (102).

3. The method for dismantling temporary supports for bridge construction according to claim 2, characterized in that, The connection positions of the wire rope (33) and the fixed pulley (32) and the connection positions of the wire rope (33) and the upper component (102) are on the same horizontal straight line.

4. The method for dismantling temporary supports for bridge construction according to claim 1, characterized in that, The adjustable temporary support (2) is a sand bucket support (21), and the inside of the sand bucket support (21) is filled with sand as a pressure-bearing medium. In S2, the height of the sand bucket support (21) is reduced by releasing the sand grains inside, so that at least one side of the upper member (102) is separated from the lower foundation (101).

5. The method for dismantling temporary supports for bridge construction according to claim 4, characterized in that, The sand bucket support (21) is provided in four parts, located at the four corners between the upper component (102) and the lower foundation (101); In S2, sand grains are first released from the sand bucket support (21) located diagonally opposite each other.

6. The method for dismantling temporary supports for bridge construction according to claim 5, characterized in that, After the sand bucket support (21) is released, a jack (4) is set at the corresponding position. The jack (4) is used to provide auxiliary support and height fine adjustment during the overturning process of the support.

7. The method for dismantling temporary supports for bridge construction according to claim 6, characterized in that, In S3, the jack (4) located away from the preset tilting side is controlled to lift the upper component (102) upward so that the upper component (102) tilts along the preset tilting side.

8. The method for dismantling temporary supports for bridge construction according to claim 1, characterized in that, The connection structure (1) includes a support plate (11), a fixing bolt (12) and a fixing nut (13). The support plate (11) is respectively located on the bottom surface of the upper component (102) and the top surface of the lower foundation (101). The two support plates (11) are spliced ​​together, and the fixing bolt (12) passes through the two support plates (11) in sequence and is locked by the fixing nut (13).

9. The method for dismantling temporary supports for bridge construction according to claim 8, characterized in that, Multiple connection structures (1) are provided, located at the four corners between the upper component (102) and the lower foundation (101); In S2, only the fixing nut (13) of the connection structure (1) that is away from the preset tilting side is released. In S3, the upper component (102) rotates and tilts around the fixed bolt (12) on the preset tilting side as the pivot.

10. The method for dismantling temporary supports for bridge construction according to any one of claims 1-9, characterized in that, The bottom of the subbase (101) is provided with a roadbed box plate (105).

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