A method for reconstructing a steel structure plant support beam by replacing a column

Abstract

The present application relates to the technical field of steel structure factory building, and particularly relates to a steel structure factory building joist column replacement reconstruction method.The steel structure factory building joist column replacement reconstruction method comprises the following steps: S1, prefabricating a fourth steel column and a joist; S2, removing a first web member assembly, installing the fourth steel column between a first steel column and a second steel column, and leaving a gap between the fourth steel column and a roof beam for placing the fourth steel column and a support structure; S3, supporting and connecting the joist at the top of the fourth steel column, and connecting one side of the joist with the first steel column and the other side of the joist with the second steel column; S4, installing the support structure at the top of the joist, and supporting the roof beam through the support structure; and S5, cutting off the part of the second steel column below the joist.The steel structure factory building joist column replacement reconstruction method can effectively reduce the risk existing in the reconstruction of the steel structure factory building, can be used in actual engineering, and compared with the method of sequentially removing the net rack at the top of the factory building and removing the crane beam, the steel structure factory building joist column replacement reconstruction method effectively saves the construction period and greatly reduces the reconstruction cost.

Description

Technical Field

[0001] This invention relates to the field of steel structure factory building technology, and in particular to a method for replacing columns with beams in steel structure factory buildings. Background Technology

[0002] like Figure 1 As shown, the steel columns of the steel structure factory building are generally in double rows, namely the first steel column 1 and the second steel column 2. The first steel column 1 and the second steel column 2 are connected by the first web member assembly 3. The top of the first steel column 1 and the second steel column 2 jointly support the top beam 4. The top beam 4 supports the space frame 5 on the upper part. The crane beam 6 is connected to the inner side of the second steel column 2.

[0003] During the renovation of steel structure factory buildings, widening the clear span often requires sequentially dismantling the roof truss 5, crane beam 6, and supporting beams, then cutting the second steel column 2. Finally, a new, wider foundation is constructed, and a third steel column is reinstalled near the first steel column 1. The dismantled sections are then reassembled, with the tops of the first and third steel columns jointly supporting the top beam 4. This process is time-consuming, requires a large area for material storage, and may even necessitate the use of cranes to transport materials. The entire process is slow, labor-intensive, and time-consuming.

[0004] To solve the above problems, the art has considered first removing the first web member assembly 3, then installing a third steel column between the first steel column 1 and the second steel column 2, then setting up a support structure on the upper part of the third steel column, and having the support structure support the top beam 4, and then removing the second steel column 2 to achieve the purpose of replacing the column. However, since the upper space frame 5 and the top beam 4 have not been removed, it is impossible to use professional equipment to hoist and adjust the support structure (jacks are not suitable for long-term load-bearing structures, and only structural rigid supports can be used). Therefore, manual installation and adjustment are required, and the whole process is very slow. During this process, due to the absence of the first web member assembly 3, the stiffness of the first steel column 1 and the second steel column 2 decreases sharply. As time increases, the risk of instability of the first steel column 1 and the second steel column 2 increases significantly. Therefore, this method is very risky, and it is not possible to carry out construction in this way on site. Summary of the Invention

[0005] The purpose of this invention is to address the problem in the prior art where the construction process is very slow when using a supporting structure to support the beam, and the stiffness of the first and second steel columns decreases sharply due to the lack of a first web member assembly, leading to a significant increase in the risk of instability of the first and second steel columns over time. This invention provides a method for replacing the columns in the beam of a steel structure factory building.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for replacing columns with beams in the reconstruction of a steel structure factory building includes the following steps: S1. Precast fourth steel column and supporting beam; S2. Remove the first web member assembly, and install the fourth steel column between the first steel column and the second steel column, leaving a gap between the fourth steel column and the top beam for placing the fourth steel column and the supporting structure; S3. The support beam is connected to the top of the fourth steel column, and one side of the support beam is connected to the first steel column, and the other side of the support beam is connected to the second steel column; S4. Install the support structure on top of the support beam and support the top beam through the support structure; S5. Cut off the portion of the second steel column located below the support beam.

[0007] The present application describes a method for renovating a steel structure factory building by replacing the support beam with a column. By prefabricating a fourth steel column and a support beam, the fourth steel column and support beam can be quickly installed after the removal of the first web member assembly. The support beam connects the first, second, and fourth steel columns into a truss structure, increasing overall stability. Simultaneously, the support beam effectively reduces the free length of the first and second steel columns, thereby increasing their stiffness and effectively reducing the probability of instability after the removal of the first web member assembly. Sufficient time is then available to install the supporting structure to support the top beam. Afterward, the portion of the second steel column below the support beam is removed, thus widening the clear span. This method effectively reduces the risks associated with the renovation of steel structure factory buildings and can be applied in practical engineering projects. Compared to sequentially dismantling the roof truss and crane beams, it effectively saves construction time and significantly reduces renovation costs.

[0008] Preferably, in step S2, while the fourth steel column is being installed, a second web member assembly is connected between the first steel column and the second steel column. This further reduces the probability of instability of the first, second, and fourth steel columns after the first web member assembly is removed.

[0009] Preferably, the supporting structure and the fourth steel column are vertically aligned.

[0010] Preferably, the elevation of the supporting beam is lower than that of the crane beam. This design allows the crane beam and crane to be used without dismantling them during the beam replacement process. After the renovation is completed, the original crane beam and crane can continue to be used, provided that the usage requirements are met, thus saving renovation costs.

[0011] Preferably, the support structure includes a support and a wedge, the wedge being located between the support structure and the top beam, and the wedge being welded to both the support structure and the top beam.

[0012] Preferably, the supporting beam is a solid web beam.

[0013] Preferably, the fourth steel column is an H-beam.

[0014] Preferably, in step S2, the installation position of the fourth steel column is provided with a pre-embedded part for connecting the fourth steel column.

[0015] The purpose of setting up embedded parts is to save installation time for the fourth steel column and further reduce the probability of instability of the first, second, and fourth steel columns after the removal of the first web member assembly.

[0016] Preferably, in step S2, before removing the first web member assembly, the ground at the installation location of the fourth steel column is excavated down to the rock surface, and then the foundation is poured into the hole and the embedded part is installed. This method is suitable for situations where the rock surface is relatively shallow from the ground.

[0017] Preferably, in step S2, before removing the first web member assembly, a cast-in-place pile is driven so that the pile head extends into the ground at the installation location of the fourth steel column, and the embedded part is installed on the upper part of the cast-in-place pile. This method is suitable for situations where the rock surface is deep from the ground.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. The steel structure factory building reconstruction method described in this application, which involves prefabricating a fourth steel column and a supporting beam, allows for the rapid installation of the fourth steel column and supporting beam after the removal of the first web member assembly. The supporting beam connects the first, second, and fourth steel columns into a truss structure, increasing overall stability. Simultaneously, the supporting beam effectively reduces the free length of the first and second steel columns, thereby increasing their stiffness and effectively reducing the probability of instability after the removal of the first web member assembly. Sufficient time is then available to install the supporting structure to support the top beam. Afterward, the portion of the second steel column below the supporting beam is removed, widening the clear span. This method effectively reduces the risks associated with steel structure factory building reconstruction and can be applied in practical engineering projects. Compared to sequentially dismantling the roof truss and crane beams, it effectively saves construction time and significantly reduces reconstruction costs. Attached Figure Description

[0019] Figure 1 This is a structural schematic diagram of a steel structure factory building in the background art of this invention.

[0020] Figure 2 This is a schematic diagram illustrating the steps involved in treating the foundation at the installation location of the fourth steel column in a method for reconstructing a steel structure factory building by replacing the support beam with a column, as described in this invention.

[0021] Figure 3 This is a schematic diagram illustrating the steps of dismantling the first web member assembly in a method for renovating a steel structure factory building by replacing the support beam with a column, according to the present invention.

[0022] Figure 4This is a schematic diagram illustrating the steps of installing the second web member assembly and the fourth steel column in a method for renovating a steel structure factory building by replacing the support beam with a column according to the present invention.

[0023] Figure 5 This is a schematic diagram illustrating the steps of installing the support beam in a method for renovating a steel structure factory building by replacing the support beam with a column, according to the present invention.

[0024] Figure 6 This is a schematic diagram illustrating the steps of installing the supporting structure in a method for renovating a steel structure factory building by replacing the support beam with a column, according to the present invention.

[0025] Figure 7 This is a schematic diagram illustrating the steps of dismantling the portion of the second steel column located below the supporting beam in a steel structure factory building beam-column replacement reconstruction method according to the present invention.

[0026] Figure 8 This is a schematic diagram of the support structure of the present invention.

[0027] Icons: 1-First steel column; 2-Second steel column; 3-First web member assembly; 4-Top beam; 5-Space frame; 6-Cranial beam; 7-Support beam; 8-Fourth steel column; 9-Support structure; 10-Support; 11-Wedge block; 12-Second web member assembly. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings.

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0030] Example 1 like Figure 1-8 As shown in this embodiment, a method for replacing columns with beams in a steel structure factory building includes the following steps: S1. Precast fourth steel column 8 and supporting beam 7; S2. Remove the first web member assembly 3, and install the fourth steel column 8 between the first steel column 1 and the second steel column 2, leaving a gap between the fourth steel column 8 and the top beam 4 for placing the fourth steel column 8 and the supporting structure 9. S3. The support beam 7 is connected to the top of the fourth steel column 8, and one side of the support beam 7 is connected to the first steel column 1, and the other side of the support beam 7 is connected to the second steel column 2; S4. Install the support structure 9 on the top of the support beam 7, and support the top beam 4 through the support structure 9; S5. Cut off the portion of the second steel column 2 located below the supporting beam 7.

[0031] Specifically, in step S2, while the fourth steel column 8 is being installed, a second web member assembly 12 is connected between the first steel column 1 and the second steel column 2. This further reduces the probability of instability of the first steel column 1, the second steel column 2, and the fourth steel column 8 after the first web member assembly 3 is removed.

[0032] Based on the above, in a further preferred manner, the support structure 9 and the fourth steel column 8 are vertically aligned.

[0033] The supporting structure 9 includes a support 10 and a wedge 11. The wedge 11 is located between the supporting structure 9 and the top beam 4, and is welded to both the supporting structure 9 and the top beam 4. The supporting beam 7 is a solid web beam. The fourth steel column 8 is an H-beam.

[0034] In step S2, a pre-embedded part for connecting the fourth steel column 8 is installed at the excavation location. The pre-embedded part is installed to save installation time for the fourth steel column 8 and further reduce the probability of instability of the first steel column 1, the second steel column 2, and the fourth steel column 8 after the removal of the first web member assembly 3.

[0035] Based on the above, a further preferred method is to excavate the ground to the rock surface at the installation position of the fourth steel column 8 before removing the first web member assembly 3 in step S2, and then pour the foundation into the hole and install the embedded part. This method is suitable for situations where the rock surface is shallow from the ground.

[0036] Based on the above, a further preferred method is to drive a cast-in-place pile in step S2 before removing the first web member assembly 3, so that the pile head extends into the ground at the installation position of the fourth steel column 8, and install the pre-embedded part on the upper part of the cast-in-place pile. This method is suitable for situations where the rock surface is deep from the ground.

[0037] In the above scheme, the processing dimensions of the fourth steel column 8 connected to the embedded parts shall be based on the actual measured dimensions of the embedded parts in the civil construction, and the second web member assembly 12 shall be installed simultaneously during the installation of the fourth steel column 8 to ensure stability.

[0038] When the foundation is excavated to the rock surface, if the rock surface is deep, cast-in-place piles will be driven into the foundation, with the pile heads extending into the foundation and the reinforcing cage extending 60cm into the foundation. For the overlapping part of the old foundation and the new foundation, part of the old foundation will be removed without affecting the first steel column 1 and the second steel column 2, and the old and new foundations will be anchored by rebar installation.

[0039] The embedded parts are embedded and fixed before the foundation is poured. The center offset of the connecting bolts between the embedded parts and the fourth steel column 8 shall not exceed 3mm, and the elevation deviation of the top surface of the foundation shall not exceed 3mm.

[0040] Before hoisting the fourth steel column 8, a positioning plate is used to ensure hoisting accuracy. After it is in place, guy ropes are used to stabilize it. After the fourth steel column 8 is in place, the second web member assembly 12 between the first steel column 1 and the fourth steel column 8 is installed to form a stable structure. The second web member assembly 12 includes supports, diagonal braces or secondary beams.

[0041] Support beam 7 is a solid web beam with good rigidity and deflection. After the steel plate of the solid web beam is processed, it is transported to the site, hoisted to the design elevation by a chain hoist, and then quickly gas-cut, beveled, corrected, assembled and welded.

[0042] Finally, after the entire structure has stabilized, the second steel column 2 is cut off.

[0043] This embodiment describes a method for renovating a steel structure factory building by replacing the support beam with a column. By prefabricating a fourth steel column 8 and a support beam 7, the fourth steel column 8 and support beam 7 can be quickly installed after the removal of the first web member assembly 3. The support beam 7 connects the first steel column 1, the second steel column 2, and the fourth steel column 8 into a truss structure, increasing overall stability. Simultaneously, the support beam 7 effectively reduces the free length of the first steel column 1 and the second steel column 2, thereby increasing their stiffness and effectively reducing the probability of instability after the removal of the first web member assembly 3. Sufficient time is then available to install the support structure 9 to support the top beam 4. Afterward, the portion of the second steel column 2 below the support beam 7 is cut off, achieving the goal of widening the clear span. This method effectively reduces the risks associated with the renovation of steel structure factory buildings and can be applied in practical engineering projects. Compared to methods such as sequentially removing the roof truss 5 and the crane beam 6, it effectively saves construction time and significantly reduces renovation costs.

[0044] Example 2 like Figure 1-7 As shown in this embodiment, a method for replacing columns with supporting beams in a steel structure factory building is described. The elevation of the supporting beam 7 is lower than that of the crane beam 6. This design allows the crane beam 6 and the crane to be dismantled during the replacement of columns with supporting beams. After the renovation is completed, the original crane beam 6 and the crane can continue to be used, provided that the usage requirements are met, thereby saving renovation costs.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for renovating a steel structure factory building by replacing the supporting beam with a column, characterized in that, Includes the following steps: S1. Precast fourth steel column (8) and supporting beam (7); S2. Excavate the installation position of the fourth steel column (8), set up the embedded parts for connecting the fourth steel column (8), remove the first web member assembly (3), retain the crane beam (6), and install the fourth steel column (8) between the first steel column (1) and the second steel column (2), and leave a gap between the fourth steel column (8) and the top beam (4) for placing the support structure (9). The fourth steel column (8) and the second steel column (2) are spaced apart. While the fourth steel column (8) is being installed, connect the second web member assembly (12) between the first steel column (1) and the second steel column (2). S3. The support beam (7) is connected to the top of the fourth steel column (8), and one side of the support beam (7) is connected to the first steel column (1), and the other side of the support beam (7) is connected to the second steel column (2). The elevation of the support beam (7) is lower than the elevation of the crane beam (6). The support beam (7) is used to reduce the free length of the first steel column (1) and the second steel column (2). S4. Install the support structure (9) on the top of the support beam (7) and support the top beam (4) through the support structure (9); S5. Cut off the portion of the second steel column (2) located below the supporting beam (7).

2. The method for replacing columns with beams in a steel structure factory building according to claim 1, characterized in that, The supporting structure (9) and the fourth steel column (8) are vertically aligned.

3. The method for replacing columns with beams in a steel structure factory building according to claim 1, characterized in that, The support structure (9) includes a support (10) and a wedge (11). The wedge (11) is located between the support structure (9) and the top beam (4). The wedge (11) is welded to the support structure (9) and the top beam (4) respectively.

4. The method for replacing columns with beams in a steel structure factory building according to claim 1, characterized in that, The supporting beam (7) is a solid web beam.

5. The method for replacing columns with beams in a steel structure factory building according to claim 1, characterized in that, The fourth steel column (8) is an H-beam.

6. The method for replacing columns with beams in a steel structure factory building according to claim 1, characterized in that, In step S2, before removing the first web member assembly (3), the ground at the installation location of the fourth steel column (8) is chiseled down to the rock surface, and then the foundation is poured into the chisel and the embedded part is installed.

7. The method for replacing columns with beams in a steel structure factory building according to claim 1, characterized in that, In step S2, before removing the first web member assembly (3), a cast-in-place pile is driven so that the pile head extends into the ground at the installation position of the fourth steel column (8), and the embedded part is installed on the upper part of the cast-in-place pile.

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