Bridge built-in type steel skeleton beam rapid construction method

Abstract

The application belongs to the technical field of bridge construction, and discloses a bridge built-in type steel skeleton crossbeam rapid construction method.The bridge built-in type steel skeleton crossbeam rapid construction method comprises the following steps: S1, hoisting the steel skeleton to the ground assembling platform, binding the first steel bar in the middle part of the steel skeleton, and then installing the first formwork in the middle part of the steel skeleton; S2, pre-burying the connecting piece on the tower column; S3, lifting the steel skeleton to the connecting piece; S4, aligning the end of the steel skeleton with the connecting piece, and then fixing and connecting the steel skeleton with the connecting piece; S5, binding the second steel bar in the end of the steel skeleton, installing the second formwork, and fixing and connecting the second steel bar and the second formwork with the tower column, and then pouring the concrete into the formwork; S6, after the concrete solidifies, removing the first formwork and the second formwork.The bridge built-in type steel skeleton crossbeam rapid construction method does not need to set the floor support or pre-bury the support frame, accelerates the construction progress, and reduces the construction cost.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a rapid construction method for bridge built-in steel frame crossbeams. Background Technology

[0002] Crossbeams are common supporting and load-bearing structures in long-span bridges. They are typically prestressed concrete box girder structures, and traditionally, crossbeam construction uses the cast-in-place method with scaffolding. The appropriate structural form for cast-in-place crossbeam scaffolding construction should be selected based on factors such as the characteristics of the pylon structure and construction conditions. Currently, commonly used scaffolding structures include ground-supported scaffolding, corbel-supported scaffolding, and a scaffold-free construction method. However, regardless of whether ground-supported scaffolding, corbel-supported scaffolding, or scaffold-free methods are used for crossbeam construction, a large number of temporary load-bearing supports need to be erected, and all of them need to be dismantled after the crossbeam construction is completed. This undoubtedly increases construction costs and efficiency, and also increases safety hazards. Summary of the Invention

[0003] The purpose of this invention is to provide a rapid construction method for bridge built-in steel frame crossbeams, which eliminates the need for ground supports or pre-embedded support frames, thereby accelerating the construction progress and reducing construction costs.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] Rapid construction methods for bridge built-in steel frame crossbeams include:

[0006] S1. The steel frame is hoisted to the assembly platform on the ground. The steel frame has a middle section and two ends along its length. The first reinforcing bar is tied to the middle section of the steel frame. Then, the first template is installed in the middle section of the steel frame.

[0007] S2. Embed connectors on the tower column;

[0008] S3. Lift the steel frame along the first direction to the connector;

[0009] S4. Adjust the position of the steel frame so that the end of the steel frame is aligned with the connector, and then fix the steel frame to the connector.

[0010] S5. Tie the second reinforcing bar to the end of the steel frame and install the second formwork, and fix the second reinforcing bar and the second formwork to the tower column, and then pour concrete into the formwork;

[0011] S6. After the concrete has solidified, remove the first formwork and the second formwork.

[0012] Preferably, the connector is provided with a lifting member, which is connected to the steel frame and is used to apply a force to the steel frame to move the steel frame along the first direction.

[0013] Preferably, the connector is provided with a first driving member, which is used to drive the lifting member to move along a second direction.

[0014] Preferably, the connector is further provided with a second driving member, which is used to drive the lifting member to move in a third direction.

[0015] Preferably, step S1, before hoisting the steel frame onto the assembly platform, also includes:

[0016] Multiple trusses are assembled into the aforementioned steel frame.

[0017] The beneficial effects of this invention are as follows:

[0018] The present invention provides a rapid construction method for bridge built-in steel frame crossbeams. First, on a ground assembly platform, reinforcing bars are tied to the middle section of the steel frame and a first formwork is installed. Then, the steel frame is lifted along a first direction to the connector and fixedly connected. Next, second reinforcing bars are tied to the ends of the steel frame and a second formwork is installed. Because the first reinforcing bars are tied and the first formwork is installed on the ground, the amount of high-altitude work involved in subsequent reinforcing bar tying and formwork installation is reduced after the steel frame is lifted to the connector, thereby lowering the risk of high-altitude operations. Simultaneously, since the second reinforcing bars and the second formwork at the ends of the steel frame are fixedly connected to the connector before tying and installation, the second reinforcing bars can more easily connect to the pre-reserved connectors on the side tower columns. The precise alignment and connection of the reinforcing bars avoids the problem of misalignment with the pre-reserved connecting reinforcing bars of the tower columns caused by pre-tying on the assembly platform, thus improving construction efficiency. At the same time, the second formwork can also be accurately assembled with the tower columns on both sides, preventing grout leakage during subsequent concrete pouring. Since the steel frame serves as the main support structure for the first and second reinforcing bars, the first and second formwork, and the concrete, there is no need to set up additional ground supports or pre-embedded support frames, which greatly reduces the workload of disassembling and assembling ground supports or pre-embedded support frames, speeds up the construction progress, and reduces construction costs. Furthermore, after construction, the steel frame is integrated into the crossbeam as part of the crossbeam, which can bear the load of the crossbeam and further improve the structural strength of the crossbeam. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the steel frame before it is hoisted to the assembly platform, according to a specific embodiment of the present invention.

[0020] Figure 2This is an overall structural diagram of the lifting member lifting the steel frame along the first direction, provided in a specific embodiment of the present invention.

[0021] Figure 3 This is an overall structural diagram of the steel frame and connectors after being connected, provided in a specific embodiment of the present invention;

[0022] Figure 4 yes Figure 3 AA section view in the image.

[0023] In the picture:

[0024] 100-type steel frame;

[0025] 200-Tower Column;

[0026] 1-Assembly platform;

[0027] 2-Connector; 21-Upper chord connecting section; 22-Lower chord connecting section;

[0028] 3-Lifting component. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0030] 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, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to 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 based on the specific circumstances.

[0031] In this invention, unless otherwise explicitly 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 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 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.

[0032] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0033] like Figures 1 to 3 As shown, this invention provides a rapid construction method for bridge built-in steel frame crossbeams, which includes:

[0034] S1. The steel frame 100 is hoisted onto the assembly platform 1 on the ground. The steel frame 100 has a middle section and two ends along its length. The first reinforcing bar is tied to the middle section of the steel frame 100, and then the first template is installed on the middle section of the steel frame 100. In this embodiment, the assembly platform 1 is built on the ground between the tower columns 200. A tower crane is used to hoist the steel frame 100 onto the assembly platform 1. Construction workers tie the first reinforcing bar to the steel frame 100 and install the first template on the assembly platform 1.

[0035] S2. Pre-embed connectors 2 on the tower column 200. In this embodiment, connectors 2 are pre-embedded on the tower columns 200 on both sides at the predetermined crossbeam installation height. The connectors 2 include an upper chord connecting section 21 and a lower chord connecting section 22.

[0036] S3. The steel frame 100 is lifted along the first direction to the connector 2. In this embodiment, a lifting member 3 is provided on the upper chord connecting section 21 of the connector 2. The lifting member 3 lifts the steel frame 100 on the assembly platform 1 along the first direction via a steel cable.

[0037] S4. Adjust the position of the steel frame 100 so that the ends of the steel frame 100 are aligned with the connectors 2, and then fix the steel frame 100 to the connectors 2. In this embodiment, after the steel frame 100 is lifted to the connectors 2 using the lifting member 3, the construction personnel fine-tune the position of the steel frame 100 so that its ends are aligned with the connectors 2 on the two tower columns 200 respectively. Then, the steel frame 100 is welded to the connectors 2, thereby fixing the steel frame 100 to the tower column 200. The connectors 2 include an upper chord connecting section 21 and a lower chord connecting section 22. It can be understood that before welding, the construction personnel adjust the position of the steel frame 100 so that the upper chord of the steel frame 100 is aligned with the upper chord connecting section 21 and the lower chord is aligned with the lower chord connecting section 22. Then, the upper chord and the lower chord are welded to the upper chord connecting section 21 and the lower chord connecting section 22 respectively, thereby completing the fixed connection of the steel frame 100.

[0038] S5. Tie the second reinforcing bar to the end of the steel frame 100 and install the second formwork. Fix both the second reinforcing bar and the second formwork to the tower column 200, and then pour concrete into the formwork. In this embodiment, after fixing the steel frame 100 to the connector 2, the construction workers tie the second reinforcing bar to the end of the steel frame 100 and connect the second reinforcing bar to the pre-reserved reinforcing bar joint on the tower column 200. Then, the construction workers install the second formwork. After the second formwork is installed, concrete is poured into both the first and second formwork.

[0039] S6. After the concrete has solidified, remove the first and second formwork. In this embodiment, the first and second formwork are removed after the concrete has solidified, and the beam construction is completed.

[0040] The above-described rapid construction method for the bridge's built-in steel frame crossbeam involves first binding reinforcing bars and installing the first formwork on the ground assembly platform 1 for the middle section of the steel frame 100. Then, the steel frame 100 is lifted along the first direction to the connector 2 for fixed connection. Next, second reinforcing bars are bound at the ends of the steel frame 100 and the second formwork is installed. Because the first reinforcing bars have already been bound and the first formwork installed on the ground, the subsequent high-altitude work of binding reinforcing bars and installing formwork at the connector 2 is reduced, as is the cost of high-altitude operations and the safety risks associated with such work. Furthermore, since the second reinforcing bars and the second formwork at the ends of the steel frame 100 are fixedly connected to the connector 2 before binding and installation, the second reinforcing bars can be more easily connected to the two side tower columns 2. The pre-reserved connecting steel bars on the 00 are aligned and connected precisely, avoiding the problem of misalignment with the pre-reserved connecting steel bars on the tower column 200 caused by pre-tying on the assembly platform 1, thus improving construction efficiency. At the same time, the second formwork can also be accurately assembled with the tower columns 200 on both sides, preventing grout leakage during subsequent concrete pouring. Since the steel frame 100 serves as the main support structure for the first steel bar, the second steel bar, the first formwork, the second formwork, and the concrete, there is no need to set up additional ground supports or pre-embedded support frames, which greatly reduces the workload of disassembling and assembling ground supports or pre-embedded support frames, improves construction progress, and reduces construction costs. After construction, the steel frame 100 is integrated into the crossbeam as part of the crossbeam, which can bear the load of the crossbeam and further improve the structural strength of the crossbeam.

[0041] Furthermore, such as Figure 2 and Figure 3As shown, a lifting member 3 is provided on the connecting member 2. The lifting member 3 is connected to the steel frame 100 and is used to apply a force to the steel frame 100 to move the steel frame 100 along a first direction. In this embodiment, the lifting member 3 is provided on the connecting member 2 and is connected to the steel frame 100 by a steel cable. The lifting member 3 can lift the steel frame 100 along the first direction. Since the lifting member 3 is provided on the connecting member 2, there is no need to set up a separate load-bearing structure for the lifting member 3, thereby reducing the amount of construction, lowering the construction difficulty and construction cost. Specifically, the lifting member 3 is a continuous jack. Continuous jacks are a commonly used lifting device in the field and are widely used in bridge construction. Its specific structure and working principle will not be described in detail here.

[0042] Specifically, such as Figure 2 and Figure 3 As shown, a first driving member is provided on the connecting member 2, which is used to drive the lifting member 3 to move along the second direction. In this embodiment, the lifting member 3 is adjustablely positioned on the connecting member 2, and the connecting member 2 is also provided with the first driving member. The first driving member can apply a force to the lifting member 3 to make the lifting member 3 move along the second direction. Specifically, the first driving member is the same as the lifting member 3, which is a continuous jack, and the first driving member is horizontally arranged on the connecting member 2 along the second direction.

[0043] Specifically, such as Figure 4 As shown, a second driving component is also provided on the connecting member 2. The second driving component is used to drive the lifting member 3 to move along a third direction. In this embodiment, the connecting member 2 is also provided with a second driving component, which can apply a force to the connecting member 2 to make the connecting member 2 move along a third direction. Specifically, the second direction is along the length direction of the steel frame 100, and the third direction is along the width direction of the steel frame 100. Both the second driving component and the first driving component are continuous jacks. The second driving component is horizontally set on the connecting member 2 along the third direction. When the steel frame 100 is lifted to the connecting member 2 using the lifting member 3, the construction personnel control the first driving component and the second driving component to adjust the horizontal position of the lifting member 3, thereby making precise position adjustment of the steel frame 100 so that the upper chord and lower chord of the steel frame 100 are aligned with the upper chord connecting section 21 and the lower chord connecting section 22, respectively.

[0044] Furthermore, before hoisting the steel frame 100 onto the assembly platform 1 in step S1, the process also includes assembling multiple sets of trusses into a steel frame 100. In this embodiment, construction workers assemble multiple sets of trusses into a steel frame 100 of specified specifications along a third direction, according to the actual condition of the bridge. Multiple connectors 2 on the tower column 200 are pre-embedded along a third direction, corresponding one-to-one with the multiple sets of trusses. Two lifting members 3 are provided on the connectors 2 of a single tower column 200. The two lifting members 3 are respectively located on the two outermost upper chord connecting sections 21. Both lifting members 3 are connected to the steel frame 100 via steel cables, thereby increasing the stability of the steel frame 100 during lifting and preventing the steel frame 100 from tilting or overturning. Simultaneously, the two lifting members 3 are connected as an integral structure by a connecting rod 4 extending along a third direction. When adjusting the horizontal position of the lifting members 3, the two lifting members 3 are activated by the first driving member or... The second driving component moves synchronously to ensure the stability of the steel frame 100 adjustment. During the connection, one end of the steel frame 100 is first welded to the connector 2 on one side of the tower column 200. Then, the closing section of the other end of the steel frame 100 is cut to obtain the gap between the other end of the steel frame 100 and the connector 2 on the other side of the tower column 200. Then, a steel beam matching the gap is cut out, and the two ends of the steel beam are welded to the end of the steel frame 100 and the connector 2 respectively, so as to achieve precise alignment and connection of the closing joint. Specifically, when connecting the steel frame 100, multiple sets of trusses and multiple connectors 2 are welded one by one in the order of middle truss-secondary side truss-side truss.

[0045] 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 will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. 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 rapid construction method for bridge built-in steel frame crossbeams, characterized in that, include: S1. The steel frame (100) is hoisted onto the assembly platform (1) on the ground. The steel frame (100) has a middle part and two ends along its length. The first reinforcing bar is tied to the middle part of the steel frame (100), and then the first template is installed in the middle part of the steel frame (100). S2. Embed connectors (2) on the tower column (200); S3. Lift the steel frame (100) along the first direction to the connector (2); S4. Adjust the position of the steel frame (100) so that the end of the steel frame (100) is aligned with the connector (2), and then fix the steel frame (100) and the connector (2) in place. S5. Tie the second reinforcing bar to the end of the steel frame (100) and install the second template, and fix the second reinforcing bar and the second template to the tower column (200), and then pour concrete into the template; S6. After the concrete has solidified, remove the first formwork and the second formwork; The connector (2) is provided with a position-adjustable lifting member (3), which is connected to the steel frame (100). The lifting member (3) is used to apply a force to the steel frame (100) so that the steel frame (100) moves along the first direction.

2. The rapid construction method for bridge built-in steel frame crossbeams according to claim 1, characterized in that, The connector (2) is provided with a first driving member, which is used to drive the lifting member (3) to move along the second direction.

3. The rapid construction method for bridge built-in steel frame crossbeams according to claim 2, characterized in that, The connector (2) is also provided with a second driving member, which is used to drive the lifting member (3) to move along a third direction.

4. The rapid construction method for bridge built-in steel frame crossbeams according to claim 1, characterized in that, Before hoisting the steel frame (100) onto the assembly platform (1) in step S1, the following steps are also included: Multiple sets of trusses are assembled into the steel frame (100).

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