Adjustable steel support structure and construction method thereof

Abstract

This invention discloses an adjustable steel support structure and its construction method, which can adapt well to construction in spaces where the planar dimensions vary significantly with height. Installation and disassembly are simple and quick, reducing manual labor in confined spaces, improving work efficiency, reducing safety hazards, and the structure is simple and low-cost. The structure includes a top formwork frame, the outer surface shape of which is adapted to the inner top surface shape of the box girder of the bridge body. Chamfered formwork frames are movably connected to both ends of the top formwork frame along a first direction. The outer surface shape of the chamfered formwork frames is adapted to the chamfer shape inside the box girder of the bridge body. An adjustment mechanism is connected between the top formwork frame and the chamfered formwork frames, and the adjustment mechanism is configured to drive the chamfered formwork frames to move relative to the top formwork frame.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to an adjustable steel support structure and its construction method. Background Technology

[0002] In bridge construction, some bridges adopt box girder structures. Currently, widely used bridge construction methods typically employ either modular scaffolding (such as disc-lock or timber scaffolding) or custom-made steel formwork for the internal support of the box girder. While these methods are mature and widely used, they also have limitations. Firstly, an increasing number of bridges now use variable cross-section continuous beams; secondly, on-site construction demands more efficient techniques. The installation and dismantling of existing modular scaffolding and timber scaffolding methods require significant manpower and resources, making risks and hazards difficult to avoid. Furthermore, modular scaffolding has the following drawbacks: it is a cubic modular scaffold, suitable for erecting in square spaces, but unsuitable for spaces where the planar dimensions vary significantly with height, such as sloping web box girders (wider at the top and narrower at the bottom). Modular scaffolding cannot fully utilize these dimensions and is unsuitable for sloping web box girder construction. Using custom-made steel formwork results in high processing costs and cannot meet the needs of construction with multiple dimensional changes. Summary of the Invention

[0003] To address the problems in the prior art, this invention provides an adjustable steel support structure and its construction method, which can adapt well to construction in spaces where the planar dimensions change significantly with height. It is easy and quick to install and disassemble, reduces manual labor in limited spaces, improves work efficiency, reduces safety hazards, and has a simple structure and low cost.

[0004] To achieve the above objectives, the present invention provides an adjustable steel support structure, including a top formwork frame. The outer surface shape of the top formwork frame is adapted to the inner top surface shape of the box girder of the bridge body. Chamfered formwork frames are movably connected to both ends of the top formwork frame along a first direction. The outer surface shape of the chamfered formwork frames is adapted to the inner chamfer shape of the box girder of the bridge body. An adjustment mechanism is connected between the top formwork frame and the chamfered formwork frames. The adjustment mechanism is configured to drive the chamfered formwork frames to move relative to the top formwork frame.

[0005] Furthermore, the top formwork frame includes a top template, which comprises multiple plates connected sequentially at an angle. The shape of the connection of the multiple plates is adapted to the shape of the inner top surface of the box girder of the bridge body. Multiple template distribution beams are provided at the bottom of the top template. The multiple template distribution beams are arranged at intervals along the shape of the top template. The length of the template distribution beams extends along a second direction. Multiple horizontal distribution beams are arranged at intervals along the second direction at the bottom of the top template. The length and shape of the horizontal distribution beams are adapted to the top template.

[0006] Furthermore, the top formwork frame also includes multiple main load-bearing beams, the length of which extends along a first direction. The multiple main load-bearing beams are arranged at intervals along a second direction, and the main load-bearing beams are corresponding to the horizontal distribution beams one by one. The main load-bearing beams and the corresponding horizontal distribution beams are fixedly connected by a combined truss.

[0007] Furthermore, a support beam is provided at the bottom of the main load-bearing beam, the length of which extends along the second direction, and the support beam is used to connect with the suspended platform mechanism.

[0008] Furthermore, one end of the chamfering mold frame is rotatably connected to the top mold frame via multiple hinges, the multiple hinges being arranged at intervals along the second direction, and the other end of the chamfering mold frame is connected to the adjustment mechanism.

[0009] Furthermore, the adjustment mechanism includes an adjustment screw and an adjustment nut that are screwed together, one of the adjustment screw and the adjustment nut being disposed on the chamfering mold frame, and the other of the adjustment screw and the adjustment nut being disposed on the top mold frame.

[0010] Furthermore, a plurality of adjustment mechanisms are provided between the top mold frame and the chamfering mold frame, and the plurality of adjustment mechanisms are arranged at intervals along the second direction.

[0011] Furthermore, a conveying mechanism is provided at the bottom of the top formwork frame, which is configured to lift the side formwork frame, the outer surface shape of which is adapted to the inner surface shape of the box girder of the bridge body.

[0012] Furthermore, the conveying mechanism includes a driver and a track, the track being mounted at the bottom of the top mold frame, the driver being mounted on the track, and the driver being configured to lift the side mold frame along the track.

[0013] The present invention also provides a construction method using the above-mentioned adjustable steel support structure, comprising: during installation, assembling and connecting the top formwork and the chamfering formwork on the ground, connecting an adjustment mechanism between the top formwork and the chamfering formwork, and then connecting it with the suspended platform mechanism to transport the whole structure to the designated position for the construction of the box girder of the bridge body, and driving the chamfering formwork to move to the designated position for the chamfering construction inside the box girder of the bridge body through the adjustment mechanism; during disassembly, driving the chamfering formwork to move through the adjustment mechanism for disassembly, and the entire adjustable steel support structure moves synchronously with the suspended platform mechanism to the next construction section.

[0014] Compared with the prior art, the adjustable steel support structure of the present invention includes a top formwork frame whose outer surface shape is adapted to the shape of the inner top surface of the box girder of the bridge body, and a chamfering formwork frame movably connected to both ends of the top formwork frame along a first direction. The outer surface shape of the chamfering formwork frame is adapted to the chamfer shape inside the box girder of the bridge body. An adjustment mechanism is connected between the top formwork frame and the chamfering formwork frame. The adjustment mechanism drives the chamfering formwork frame to move. During installation, it moves to the designated position for chamfering construction inside the box girder of the bridge body. During disassembly, it drives the chamfering formwork frame to move for demolding. Installation and disassembly are simple. At the same time, the top formwork frame, the chamfering formwork frame, and the adjustment mechanism are assembled and connected on the ground and connected to the suspended platform. The entire mechanism is transported to the designated location for the construction of the box girder of the bridge. After disassembly and demolding, the adjustable steel support structure can move synchronously with the suspended platform mechanism to the next construction section. The outer surface shape of the adjustable steel support structure of this invention is adapted to the inner surface shape of the bridge box girder, which can well adapt to the construction in spaces where the planar dimensions change significantly with height. Ground assembly and overall hoisting make installation and disassembly simple and quick, reducing manual work in limited spaces, achieving quick assembly and disassembly, improving work efficiency, reducing high-altitude work, reducing safety hazards, and being able to move synchronously with the suspended platform mechanism, with good synchronicity and adaptability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the installation structure of the present invention on the bridge body; Figure 2 This is a schematic diagram of the structure of the present invention; Among them, 1 is the top formwork frame, 101 is the top formwork, 102 is the formwork distribution beam, 103 is the horizontal distribution beam, 104 is the combined truss, 105 is the main load-bearing beam, 106 is the support beam, 107 is the hinge, 2 is the chamfered formwork frame, 3 is the adjustment mechanism, 301 is the adjustment screw, 302 is the adjustment nut, 4 is the conveying mechanism, 401 is the driver, 402 is the track, and 5 is the side formwork frame. Detailed Implementation

[0016] The present invention will be further explained and described below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0017] This invention provides an adjustable steel support structure, see details below. Figure 1The system includes a top formwork 1, the outer surface shape of which is adapted to the inner top surface shape of the box girder of the bridge body, and chamfered formwork 2 movably connected to both ends of the top formwork 1 along the first direction. The outer surface shape of the chamfered formwork 2 is adapted to the chamfered shape of the box girder of the bridge body. An adjustment mechanism 3 is connected between the top formwork 1 and the chamfered formwork 2. The adjustment mechanism 3 is configured to drive the chamfered formwork 2 to move relative to the top formwork 1.

[0018] The adjustable steel support structure of this invention connects the top formwork 1 to the chamfered formwork 2 at both ends along the first direction, and drives the chamfered formwork 2 to move using the adjustment mechanism 3. This allows the structure to be moved to the designated position for chamfering construction inside the box girder of the bridge during installation, and to be moved for demolding during disassembly. Installation and disassembly are simple. The top formwork 1, chamfered formwork 2, and adjustment mechanism 3 are assembled and connected on the ground, and transported as a whole to the designated position for box girder construction. After disassembly, the adjustable steel support structure can move synchronously with the suspended platform to the next construction section. The outer surface shape of the adjustable steel support structure of this invention is adapted to the inner surface shape of the box girder of the bridge, which can well adapt to the construction in spaces where the planar dimensions change significantly with height. Ground assembly and overall hoisting make installation and disassembly simple and quick, reducing manual labor in limited spaces, achieving quick assembly and disassembly, improving work efficiency, reducing high-altitude work, reducing safety hazards, and moving synchronously with the suspended platform, exhibiting good synchronicity and adaptability.

[0019] Specifically, see Figure 2 The top formwork 1 includes a top template 101, which comprises multiple plates connected at an angle in sequence. The shape of the plates is adapted to the shape of the inner top surface of the box girder of the bridge. Multiple template distribution beams 102 are provided at the bottom of the top template 101, spaced apart along the shape of the top template 101. The length of the template distribution beams 102 extends along a second direction. Multiple horizontal distribution beams 103 are also spaced apart at the bottom of the top template 101 along the second direction, with the length and shape of the horizontal distribution beams 103 adapted to the top template 101. The top template 101, template distribution beams 102, and horizontal distribution beams 103 form a stable template structure, ensuring construction quality. It should be noted that the first direction in this invention refers to the transverse direction of the bridge, i.e., the width direction of the bridge deck, and the second direction refers to the longitudinal direction of the bridge, i.e., the length direction of the bridge deck. In this embodiment, the top template 101 has a three-section variable cross-section, that is, it includes three plates connected at an angle. In other embodiments, the top template 101 can also be formed by connecting other numbers of plates in sequence. The connection angle between the plates is specifically selected according to the design requirements to adapt to the shape inside the bridge box girder.

[0020] Specifically, the top formwork frame 1 also includes multiple main load-bearing beams 105. The length of the main load-bearing beams 105 extends along a first direction, and the multiple main load-bearing beams 105 are arranged at intervals along a second direction. Each main load-bearing beam 105 corresponds to a horizontal distribution beam 103, and the main load-bearing beams 105 and their corresponding horizontal distribution beams 103 are fixedly connected by a combined truss 104. The main load-bearing beams 105 and the combined truss 104 further ensure the rigidity and stability of the top formwork frame 1.

[0021] Preferably, a support beam 106 is provided at the bottom of the main load-bearing beam 105, the length of the support beam 106 extends along the second direction, and the support beam 106 is used to connect with the suspended platform mechanism. In this embodiment, a support beam 106 is provided at each end of the bottom of the main load-bearing beam 105, and the support beam 106 adopts a double-groove 28 sliding beam to improve the reliability and stability of the connection with the suspended platform mechanism.

[0022] Preferably, one end of the chamfering mold frame 2 is rotatably connected to the top mold frame 1 via multiple hinges 107, the multiple hinges 107 being spaced apart along the second direction, and the other end of the chamfering mold frame 2 is connected to the adjustment mechanism 3. In other embodiments, the chamfering mold frame 2 can also be rotatably connected via a rotating shaft or other means, which will not be described in detail here.

[0023] Specifically, the adjustment mechanism 3 includes an adjusting screw 301 and an adjusting nut 302 screwed together. One of the adjusting screw 301 and the adjusting nut 302 is disposed on the chamfering mold frame 2, and the other of the adjusting screw 301 and the adjusting nut 302 is disposed on the top mold frame 1. In this embodiment, the adjusting screw 301 is fixed to the chamfering mold frame 2, and the adjusting nut 302 is rotatably disposed on the top mold frame 1. Specifically, the adjusting nut 302 is disposed at the end of the load-bearing main beam 105. By rotating the adjusting nut 302, the adjusting screw 301 can be extended or retracted, thereby driving the chamfering mold frame 2 to unfold or retract, realizing installation or disassembly. The structure is simple, the cost is low, and the adjustment is simple and efficient. Of course, in other embodiments, the adjustment mechanism 3 can also be an electric telescopic rod, a pneumatic / hydraulic rod, or other telescopic mechanism, as long as it can drive the chamfering mold frame 2 to rotate. No specific limitation is made here. The adjustment mechanism 3 also includes a limiter, which can be a limit nut screwed to the adjustment screw 301. The limit nut abuts against the adjustment nut 302 to realize the adjustment and limit of different extension lengths of the adjustment screw 301 to meet the needs of different chamfering construction. It can also be a fixed limit block or other similar means, which will not be specifically limited here.

[0024] In this embodiment, multiple adjustment mechanisms 3 are provided between the top formwork frame 1 and the chamfered formwork frame 2. The multiple adjustment mechanisms 3 are arranged at intervals along the second direction. In this embodiment, at least two adjustment mechanisms 3 are provided to ensure the reliability of adjustment and the stability of construction. The specific number is selected according to the actual working conditions.

[0025] Specifically, a conveying mechanism 4 is provided at the bottom of the top formwork 1. The conveying mechanism 4 is configured to lift the side formwork 5. The outer surface shape of the side formwork 5 is adapted to the inner surface shape of the box girder of the bridge. Lifting the side formwork 5 by the conveying mechanism 4 facilitates the installation, disassembly, and demolding of the side formwork 5, thereby enabling the entire top formwork 1, chamfered formwork 2, and side formwork 5 to be assembled on the ground as a whole and lifted into place. The entire structure moves synchronously through the suspended platform mechanism, which further facilitates the construction of the bridge box girder.

[0026] Preferably, the conveying mechanism 4 includes a driver 401 and a track 402. The track 402 is installed at the bottom of the top formwork frame 1, and the driver 401 is installed on the track 402. The driver 401 is configured to lift the side formwork frame 5 along the track 402. The length direction of the track 402 can extend along a first direction and / or a second direction, depending on the construction requirements. The track 402 can be made of I-beams and installed at the bottom of the load-bearing main beam 105. The driver 401 can be an electric hoist, which can travel along the track 402 to lift the side formwork frame 5. The structure is simple, stable, and efficient.

[0027] The chamfered formwork 2 and side formwork 5 in this embodiment have similar structures to the top formwork 1, except that the outer surface of the formwork has a different shape to meet different construction section requirements. They can all include formwork, multiple formwork distribution beams, multiple horizontal distribution beams, etc. The formwork can be made of steel formwork, the formwork distribution beams can be made of channel steel, the horizontal distribution beams can be made of double-channel steel, and the main load-bearing beam 105 can be made of double-I-beam steel, etc. The specific materials and grades selected in this embodiment are based on safety, ensuring sufficient rigidity and strength to ensure construction safety.

[0028] The present invention also provides a construction method using the above-mentioned adjustable steel support structure, comprising: during installation, assembling and connecting the top formwork 1 and the chamfering formwork 2 on the ground, connecting the adjustment mechanism 3 between the top formwork 1 and the chamfering formwork 2, and then connecting it with the suspended platform mechanism to transport the whole structure to the designated position for the construction of the box girder of the bridge body, and driving the chamfering formwork 2 to move to the designated position for the chamfering construction of the box girder of the bridge body through the adjustment mechanism 3; during disassembly, driving the chamfering formwork 2 to move through the adjustment mechanism 3 to disassemble the formwork, and the entire adjustable steel support structure moves synchronously with the suspended platform mechanism to the next construction section.

[0029] More specifically, the top formwork frame 1, the chamfered formwork frame 2, and the side formwork frame 5 are assembled and connected on the ground. The chamfered formwork frame 2 is connected to both ends of the top formwork frame 1 via hinges 107. The adjusting screw 301 is fixed to the chamfered formwork frame 2, and the adjusting nut 302 is rotatably mounted on the top formwork frame 1. The adjusting screw 301 and the adjusting nut 302 are screwed together. A rail 402 is installed at the bottom of the main load-bearing beam 105 of the top formwork frame 1. A driver 401 is installed on the rail 402. The driver 401 lifts the side formwork frame 5. The entire assembly is lifted to the suspended platform mechanism by a tower crane or similar means. The suspended platform mechanism is supported by a support beam 106. Next, the entire structure is transported to the designated location for the construction of the box girder of the bridge. The adjusting nut 302 is rotated to adjust the length of the adjusting screw 301 so that the chamfered formwork 2 reaches the designated position. The driver 401 drives the side formwork 5 to the designated position along the track 402 and fixes it for construction. After the concrete strength reaches the standard, when dismantling, the adjusting nut 302 is turned in the opposite direction to dismantle the top formwork 1 and the chamfered formwork 2. The driver 401 drives the side formwork 5 to dismantle. After dismantling, the scaffolding mechanism synchronously drives the entire adjustable steel support structure to move synchronously to the next construction section.

[0030] The invention can be assembled on the ground, reducing the risks of high-altitude material hoisting and assembly. The chamfered mold frame 2 and the side mold frame 5 hoisted by the conveying mechanism 4 reduce the inconvenience and safety risks caused by working in confined spaces. Installation and disassembly are simple and quick, achieving rapid assembly and disassembly, which improves construction efficiency. It solves the difficulties of working in confined spaces such as disc-type brackets and fixed steel molds in box chambers, improves the construction safety factor, and the whole can move synchronously with the suspended platform mechanism for construction. It has high reusability, wide adaptability, simple structure, and low cost.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An adjustable steel support structure, characterized in that, The system includes a top formwork (1), the outer surface shape of which is adapted to the inner top surface shape of the box girder of the bridge body. The top formwork (1) is movably connected to two ends of a chamfered formwork (2) along a first direction. The outer surface shape of the chamfered formwork (2) is adapted to the inner chamfer shape of the box girder of the bridge body. An adjustment mechanism (3) is connected between the top formwork (1) and the chamfered formwork (2). The adjustment mechanism (3) is configured to drive the chamfered formwork (2) to move relative to the top formwork (1).

2. The adjustable steel support structure according to claim 1, characterized in that, The top formwork frame (1) includes a top template (101), which includes multiple plates connected at an angle in sequence. The shape of the plates is adapted to the shape of the inner top surface of the box girder of the bridge body. Multiple template distribution beams (102) are provided at the bottom of the top template (101). The multiple template distribution beams (102) are arranged at intervals along the shape of the top template (101). The length of the template distribution beams (102) extends along a second direction. Multiple horizontal distribution beams (103) are arranged at intervals along the second direction at the bottom of the top template (101). The length and shape of the horizontal distribution beams (103) are adapted to the top template (101).

3. The adjustable steel support structure according to claim 2, characterized in that, The top formwork frame (1) also includes multiple main load-bearing beams (105). The length of the main load-bearing beams (105) extends along a first direction. The multiple main load-bearing beams (105) are arranged at intervals along a second direction. The main load-bearing beams (105) and the corresponding horizontal distribution beams (103) are arranged in a one-to-one correspondence. The main load-bearing beams (105) and the corresponding horizontal distribution beams (103) are fixedly connected by a combined truss (104).

4. The adjustable steel support structure according to claim 3, characterized in that, The bottom of the main beam (105) is provided with a support beam (106), the length of which extends along the second direction, and the support beam (106) is used to connect with the suspended platform mechanism.

5. The adjustable steel support structure according to claim 1, characterized in that, One end of the chamfering mold frame (2) is rotatably connected to the top mold frame (1) through multiple hinges (107), the multiple hinges (107) are arranged at intervals along the second direction, and the other end of the chamfering mold frame (2) is connected to the adjustment mechanism (3).

6. The adjustable steel support structure according to claim 5, characterized in that, The adjustment mechanism (3) includes an adjustment screw (301) and an adjustment nut (302) that are screwed together. One of the adjustment screw (301) and the adjustment nut (302) is disposed on the chamfering mold frame (2), and the other of the adjustment screw (301) and the adjustment nut (302) is disposed on the top mold frame (1).

7. The adjustable steel support structure according to claim 6, characterized in that, A plurality of adjustment mechanisms (3) are provided between the top mold frame (1) and the chamfering mold frame (2), and the plurality of adjustment mechanisms (3) are arranged at intervals along the second direction.

8. The adjustable steel support structure according to claim 1, characterized in that, The bottom of the top formwork (1) is provided with a conveying mechanism (4), which is configured to lift the side formwork (5). The outer surface shape of the side formwork (5) is adapted to the inner surface shape of the box girder of the bridge body.

9. An adjustable steel support structure according to claim 8, characterized in that, The conveying mechanism (4) includes a driver (401) and a track (402), the track (402) being mounted on the bottom of the top mold frame (1), the driver (401) being mounted on the track (402), and the driver (401) being configured to lift the side mold frame (5) along the track (402).

10. A construction method employing the adjustable steel support structure according to any one of claims 1 to 9, characterized in that, include: During installation, the top formwork frame (1) and the chamfered formwork frame (2) are assembled and connected on the ground, and an adjustment mechanism (3) is connected between the top formwork frame (1) and the chamfered formwork frame (2). The whole assembly is then connected to the suspended platform mechanism and transported to the designated position for the construction of the box girder of the bridge. The chamfered formwork frame (2) is moved to the designated position for the chamfering construction of the box girder of the bridge through the adjustment mechanism (3). During disassembly, the chamfered formwork frame (2) is moved by the adjustment mechanism (3) to disassemble the formwork. The adjustable steel support structure moves synchronously with the suspended platform mechanism to the next construction section.

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