Industrial plant roof beam column moving construction method

Abstract

The application discloses a kind of industrial plant joist column moving construction methods.The method comprises the following steps of: reinforcing the reserved column foundation and setting new column foundation;Reinforce the reserved column, and set new column on the side of the column to be moved;Set the beam between the reserved column and the new column, and embed the column to be moved in the beam;Set the concealed beam on both sides of the column to be moved to limit lateral displacement;Determine whether the crane beam system meets the requirements of the reconstruction, and build as needed;After the newly poured beam column concrete reaches the design strength, cut off the lower half of the column to be moved.The beam embedding and column moving of the present application significantly improve the lateral stiffness of the structure, reduce the horizontal displacement, and also take into account the flexible handling of the crane beam system, have little impact on production during construction, short construction period, low cost, good economy and popularization value.

Description

Technical Field

[0001] This invention belongs to the field of building renovation technology, specifically relating to a method for constructing beam-supported column relocation in industrial plants. Background Technology

[0002] With the continuous upgrading of industrial production processes in my country, a large number of old industrial plants built in the last century can no longer meet the needs of modern production. On the one hand, the original column spacing of the plants is too narrow, making it impossible to accommodate the layout of new equipment; on the other hand, after multiple renovations, the internal facilities of the plants are intertwined and the space is cramped, further restricting the introduction of new production lines. Therefore, adjusting the column grid of existing industrial plants, realizing column relocation, or partially removing columns has become a common requirement in renovation projects.

[0003] Traditional column relocation methods typically employ the "column removal method," which involves directly demolishing the intermediate columns and rebuilding large-span support beams, merging two spans into one. The drawbacks of this method are: doubling the column spacing leads to a significant increase in the support beam cross-section, occupying a large amount of clearance and substantially increasing construction costs; simultaneously, it reduces the structure's lateral stiffness, increases horizontal displacement, and results in poor load-bearing performance.

[0004] Another common renovation method is the "demolition-then-construction" column relocation method, which involves first removing the existing columns and then constructing new column positions. This method requires production to be suspended or partially suspended during construction, which has a significant impact on normal production. It also has a long construction period and high safety risks.

[0005] In recent years, a "build first, then demolish" approach to column relocation has emerged. For example, Chinese patent application CN118774445A discloses a method for relocating columns using a beam-supported structure. This method involves constructing a new frame column next to the original column to be renovated, connecting the old and new column heads, and then cutting off the lower part of the original column after they share the load. While this method reduces the scope of the renovation, it primarily relies on the column head connection to transfer the load and fails to provide effective lateral constraint on the column, resulting in limited improvement in lateral stiffness. Furthermore, this method does not address the specific crane beam system required for industrial plants, making it difficult to directly apply to the renovation of heavy-duty factory buildings with crane beams.

[0006] Therefore, there is an urgent need for a beam-column relocation modification method suitable for industrial plants that can flexibly adjust column spacing, ensure structural lateral stiffness, and minimize the impact on production. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a method for constructing beam-supported column relocation in industrial plants. By embedding the crossbeams and constraining them with concealed beams, the lateral stiffness is significantly improved. At the same time, it also takes into account the reconstruction of the crane beam system, achieving flexible construction, minimal impact on production, short construction period, and significant economic benefits in the renovation of beam-supported columns in industrial plants.

[0008] This invention is achieved through the following technical solution:

[0009] A method for constructing beam-supported column relocation in an industrial plant includes the following steps:

[0010] Step 1) Reinforce the foundation of the retained column (1) and at the same time set the foundation of the new column (5);

[0011] Step 2) Reinforce the retained column (1) and at the same time set the new column (5) next to the column (2) to be moved;

[0012] Step 3) Install a crossbeam (6) between the retained column (1) and the new column (5), and secure the column (2) to be moved in the crossbeam (6);

[0013] Step 4) Install hidden beams (7) on both sides of the column (2) to be moved, so as to limit the lateral displacement of the column (2);

[0014] Step 5) After the newly poured beam and column concrete reaches the design strength requirements, cut off the lower half of the column (2) to be moved.

[0015] Preferably, the method further includes step 6), which is a crane beam system reconstruction step, specifically as follows:

[0016] Determine whether the original crane beam (3) meets the production requirements after the modification. If it does, the original crane beam is used. If it does not, a new shoulder beam (8) is set at the corresponding elevation of the new column (5), and the original crane beam (3) is modified or replaced according to the spacing of the new column so that it is supported on the new shoulder beam (8).

[0017] Preferably, when determining whether the original crane beam (3) meets the production requirements after the modification, it is necessary to calculate the bending bearing capacity and deflection of the newly built crossbeam (6), and verify the upper part of the column to be moved (2) and the lateral stiffness of the new column (5); if the crossbeam (6) and the column to be moved (2) can withstand the vertical force and horizontal braking force of the original crane beam (3) and meet the clearance requirements, the original crane beam (3) is retained; otherwise, a new shoulder beam (8) is set at the top of the new column (5), and the new crane beam is replaced accordingly.

[0018] Preferably, the foundation of the new column (5) is made of cast-in-place concrete, and the bottom area of ​​the foundation is increased to increase the bearing capacity of the foundation.

[0019] Preferably, if the original foundation is a pile foundation, the foundation is reinforced by increasing the number of piles.

[0020] Preferably, the retained column (1), the new column (5) and the crossbeam (6) are all made of high-strength concrete with a strength grade higher than that of the original factory building column concrete.

[0021] Preferably, the high-strength concrete is a C40~C50 micro-expansion concrete.

[0022] Preferably, the reinforcement of the retained column (1) is carried out by increasing the cross-section and adding steel bars to increase its bearing capacity, stiffness and stability.

[0023] Preferably, in step 5), after the newly poured beam and column concrete reaches the design strength requirement, the old factory column section at the bottom of the crossbeam (6) is cut off.

[0024] The beneficial effects of this invention are as follows:

[0025] (1) The construction method of the present invention effectively ensures the fixation of the column to be moved to the beam by setting a crossbeam between the retained column and the new column and embedding the column to be moved in the crossbeam, while adding hidden beams on both sides of the column to be moved. Compared with the overall removal of the column, the column moving significantly improves the lateral stiffness of the structure, reduces the horizontal displacement, and improves the stress performance of the structure.

[0026] (2) During the construction of new columns and the pouring of crossbeams, other areas of the factory can operate normally. Production only needs to be temporarily suspended during the load conversion of the old and new structures and the removal of old columns, which greatly reduces the impact of the renovation construction on the operation of the production line.

[0027] (3) The construction method of the present invention includes a crane beam reconstruction judgment step, which can flexibly choose to retain the original crane beam or set a new bracket and replace the crane beam according to the load-bearing capacity of the original crane beam and the clearance requirements after the renovation, so as to fully meet the renovation needs of different types of industrial plants.

[0028] (4) The construction method of the present invention does not require the complete demolition of the original columns and roof system. The scope of the modification is limited to the local addition of columns, beams and hidden beams. Using concrete with a higher strength grade than the original columns can shorten the curing time, thereby greatly shortening the overall construction period.

[0029] (5) Compared with the traditional column removal method, the construction method of the present invention reduces the amount of concrete and the cost of civil engineering renovation, thus reducing the project cost; at the same time, due to the short construction period and short downtime, it effectively reduces the economic losses caused by the downtime, and has high economic efficiency and good prospects for promotion and application. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the factory building's facade structure before the renovation.

[0031] Figure 2 This is a schematic diagram of the plan structure behind the newly added factory building columns;

[0032] Figure 3 This is a schematic diagram of the elevation structure after the addition of columns and beams to the factory building.

[0033] Figure 4 A schematic diagram of the facade structure after the columns of the old factory building have been removed;

[0034] Figure 5 This is a schematic diagram of the newly added corbel (shoulder beam) factory column in Example 1;

[0035] Figure 6 This is a schematic diagram of the factory building column with corbels (shoulder beams) added in Example 2;

[0036] In the diagram: 1. Retained column; 2. Column to be moved; 3. Crane beam; 4. Roof support system; 5. New column; 6. Horizontal beam; 7. Hidden beam; 8. Corbel. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0038] In the description of this invention, terms such as "top," "bottom," "upper," "lower," "left," and "right," which indicate orientation or positional relationship, are used only based on the orientation shown in the accompanying drawings for the purpose of describing this invention, and are not intended to indicate or imply that the device 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 this invention.

[0039] Example 1

[0040] This embodiment provides a method for constructing a beam-supported column relocation system in an industrial plant. It is applicable to situations where the renovation area lacks a crane beam system, or where existing crane beams, after calculation, can continue to meet usage requirements. The original plant was a single-story industrial plant for metallurgical steel rolling, a 24m+24m double-span plant with a column spacing of 6m, a rail top elevation of 6m, and two bridge cranes operating in each span. It consisted of concrete I-beam columns, concrete crane beams, and a concrete truss roof structure. Due to an upgrade in the steel rolling process, new products required an 8m clear width to pass through the column array, necessitating the removal of one column from the plant. Considering the plant had been in use for many years, to ensure safety and reliability, minimize downtime for renovation, shorten the construction period, and save on project costs, the original column spacing of 6m was changed to 9m to meet the process production requirements. Based on this, as follows... Figures 1-5 As shown, the specific steps are as follows:

[0041] 1. Basic processing

[0042] The foundation of the original retained column 1 was reinforced on the outside by using micro-expansion concrete to increase the foundation's bottom area and improve its bearing capacity. Simultaneously, a new foundation pit was excavated next to the column to be moved, at the designed location. The foundation of the new column 5 was constructed using C40 concrete (the original column's concrete grade was C30), with pre-reinforced steel reinforcement joints. The construction of the old and new foundations can proceed in parallel.

[0043] 2. Construction of Column Reinforcement and New Columns

[0044] For the retained column 1, a method of increasing the cross-section was used for reinforcement. After removing the loose dust from the original column surface, new reinforcing bars were tied, and C45 micro-expansion concrete was poured after formwork was erected, completely enclosing the original column in the new cross-section to increase its load-bearing capacity, stiffness, and stability. Simultaneously, on the side of the column to be moved (i.e., in the predetermined direction of relocation), the reinforcing bars for the new column 5 were tied and formwork erected, and C45 high-strength concrete was poured to achieve the design height. The distance between the new column 5 and the retained column 1 is 3 m to meet the new 9 m column spacing requirement.

[0045] 3. Beam installation and column relocation

[0046] A crossbeam 6 is installed between the retained column 1 and the new column 5, close to the lower part of the corbel of the column to be moved 2. The reinforcing bars of the crossbeam 6 are anchored into the retained column 1 and the new column 5 according to their anchorage length. After formwork is erected, the column to be moved 2 is embedded in the formwork of the crossbeam 6, so that the crossbeam 6 forms a whole with the column to be moved 2 after pouring. Simultaneously, hidden beams 7 are installed vertically on both sides of the column to be moved 2. The hidden beams 7 have a cross-sectional width of 0.45 m and a height the same as the crossbeam 6. The reinforcing bars of the hidden beams 7 are embedded in the original column and the crossbeam 6, effectively ensuring the secure embedding of the column to be moved 2 and the crossbeam 6. The crossbeam 6 and the hidden beams 7 are integrally cast using C45 high-strength concrete.

[0047] 4. Crane beam system treatment

[0048] The load-bearing capacity and deflection of the original crane beam 3 were calculated. Calculations showed that, under the modified 9-m column spacing, the original crane beam 3 met the specifications for bending capacity, deflection, and clearance. Furthermore, the upper part of the crossbeam 6 and the column to be moved 2 could withstand the vertical force and horizontal braking force transmitted by the original crane beam 3. Therefore, the original crane beam 3 was retained without replacement or relocation.

[0049] 5. Maintenance and removal of old columns

[0050] The newly constructed reinforced section of retained column 1, new column 5, beam 6, and concealed beam 7 were allowed to cure naturally. C40 micro-expansion concrete with a strength grade higher than the original column was used. After a standard curing time of 21 days, the concrete strength reached the design requirement of C35 concrete. Then, using a wire saw, the lower half of the column 2 to be moved was removed at the lower edge of beam 6, completely relieving the load transfer of column 2 to the foundation, thus completing the beam-column relocation modification.

[0051] Example 2

[0052] This embodiment provides a method for constructing a beam-supported column relocation system in an industrial plant. It is essentially the same as Embodiment 1, except that the original crane beam 3, after calculation, cannot meet the requirements of the modified system. The original plant is a single-story industrial plant for metallurgical steel rolling, a 24m+24m double-span plant with a column spacing of 6m, a rail top elevation of 6m, and concrete I-beam columns, concrete crane beams, and a concrete truss roof structure. Due to the upgrading of the steel rolling process, new products require an 8m clear width to pass through the column array, necessitating the removal of one column from the plant. Furthermore, the two bridge cranes operating in each span need to be modified to increase the lifting capacity, and the original crane beam cannot meet the current design requirements. Considering that the plant has been in use for many years, to ensure the plant's safety and reliability, reduce downtime for renovation, shorten the construction period, and save on project costs, the original column spacing of 6m will be changed to 9m to meet the process production requirements. Figures 1-4 As shown in Figure 6, the specific steps are as follows:

[0053] Steps (1) to (3) are the same as in Example 1, but during the construction of the new column 5, the position for setting the corbel 8 (shoulder beam) is reserved at the top.

[0054] (4) Reconstruction of crane beam system

[0055] Calculations showed that the original crane beam 3 did not meet the specifications for deflection and bearing capacity under the modified column spacing. Therefore, a new concrete shoulder beam (corbel 8) was installed at the corresponding elevation of the new column 5 (i.e., the original crane beam support elevation). The reinforcement of corbel 8 was tied to the main column reinforcement and then cast integrally. The original crane beam 3 was removed, and a new crane beam was customized and installed according to the new 9 m column spacing, so that the new crane beam was supported on corbel 8 of the new column 5.

[0056] To separate the crane beam load from the roof truss load, a corbel 8 can be optionally added to the top of the column to completely unload the crane beam system onto the new column 5, so that the newly added beam 6 only bears the roof truss load transmitted from the upper part of the column 2 to be moved, further reducing the deflection and cross-sectional dimensions of the beam 6.

[0057] (5) Maintenance and removal of old columns

[0058] Same as Example 1. After the concrete reaches the required strength, first cut off the connection between the column 2 to be moved and the lower part of the beam 6, then cut off the lower half of the old column to complete the renovation.

[0059] This invention is applicable to column grid renovation projects for various single-story and multi-story industrial buildings, and is especially suitable for heavy-duty buildings with crane beams, with good prospects for promotion and application.

[0060] The embodiments described above are only some, not all, of the embodiments of the present invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments. The scope of protection of the present invention is determined by the scope claimed in the claims. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A method for constructing a beam-supported column relocation system in an industrial plant, characterized in that, Includes the following steps: Step 1) Reinforce the foundation of the retained column (1) and at the same time set the foundation of the new column (5); Step 2) Reinforce the retained column (1) and at the same time set the new column (5) next to the column (2) to be moved; Step 3) Install a crossbeam (6) between the retained column (1) and the new column (5), and secure the column (2) to be moved in the crossbeam (6); Step 4) Install hidden beams (7) on both sides of the column (2) to be moved, so as to limit the lateral displacement of the column (2); Step 5) After the newly poured beam and column concrete reaches the design strength requirements, cut off the lower half of the column (2) to be moved.

2. The construction method for supporting beams and moving columns in an industrial plant according to claim 1, characterized in that, It also includes step 6), which is the reconstruction step of the crane beam system, as follows: Determine whether the original crane beam (3) meets the production requirements after the modification. If it does, the original crane beam is used. If it does not, a new shoulder beam (8) is set at the corresponding elevation of the new column (5), and the original crane beam (3) is modified or replaced according to the spacing of the new column so that it is supported on the new shoulder beam (8).

3. The construction method for supporting beams and moving columns in an industrial plant according to claim 2, characterized in that, When determining whether the original crane beam (3) meets the production requirements after the modification, it is necessary to calculate the bending bearing capacity and deflection of the newly built crossbeam (6), and verify the upper part of the column to be moved (2) and the lateral stiffness of the new column (5); if the crossbeam (6) and the column to be moved (2) can withstand the vertical force and horizontal braking force of the original crane beam (3) and meet the clearance requirements, the original crane beam (3) is retained; otherwise, a new shoulder beam (8) is set at the top of the new column (5), and the new crane beam is replaced accordingly.

4. The construction method for supporting beams and moving columns in an industrial plant according to claim 1, characterized in that, The foundation of the new column (5) is made of cast-in-place concrete, and the bottom area of ​​the foundation is increased to increase the bearing capacity of the foundation.

5. The construction method for supporting beams and moving columns in an industrial plant according to claim 1, characterized in that, If the original foundation is a pile foundation, then the foundation is reinforced by increasing the number of piles.

6. The construction method for supporting beams and moving columns in an industrial plant according to claim 1, characterized in that, The retained column (1), the new column (5), and the beam (6) are all made of high-strength concrete with a strength grade higher than that of the original factory building column concrete.

7. The construction method for supporting beams and moving columns in an industrial plant according to claim 6, characterized in that, The high-strength concrete is a C40~C50 micro-expansion concrete.

8. The construction method for supporting beams and moving columns in an industrial plant according to claim 1, characterized in that, The reinforcement of the retained column (1) is carried out by increasing the cross section and adding steel bars to increase its bearing capacity, stiffness and stability.

9. A method for constructing a beam-supported column relocation structure in an industrial plant according to claim 1, characterized in that, In step 5), after the newly poured beam and column concrete reaches the design strength requirement, the old factory building column section at the bottom of the beam (6) is cut off.

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