A temporary roller table construction method for rolling line transformation

Abstract

The present invention provides a construction method for a temporary roller table in the transformation of a rolling line, which relates to the technical field of rolling line transformation and aims to solve the problem that the overall straightness of the roller surface of the existing temporary roller table does not meet the requirements. The method includes: removing the old roller table, and fixing the two ends of the temporary steel bridge to the entrance reserved section and the exit reserved section at both ends of the old foundation respectively; presetting a temporary support section at the middle position of the old foundation, and fixing a temporary support on the temporary support section to support the temporary steel bridge; removing the parts of the old foundation except the entrance reserved section, the temporary support section and the exit reserved section to form an emptied area; installing a steel support in the emptied area to support the temporary steel bridge, and then removing the temporary support and the temporary support section of the old foundation. The present invention is mainly used for the construction of the temporary roller table. By increasing the number of support points, the elastic deflection of the temporary steel bridge is reduced, thereby ensuring that the overall straightness of the roller surface meets the requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of rolling line transformation, and in particular to a construction method for a temporary roller path in rolling line transformation. Background Art

[0002] During the transformation of a rolling production line, after the old roller path is removed, a temporary roller path is often used to replace the old roller path, so that the transformation of the new rolling mill foundation can be realized while production is in progress, achieving the purpose of shortening the production stop time and reducing the output loss of the production plant.

[0003] The existing temporary roller path is a prefabricated temporary steel bridge, which includes a bridge body and a number of idlers installed on the bridge body; both ends of the bridge body are respectively fixed on the reserved sections at both ends of the old foundation.

[0004] However, the existing temporary roller path is mainly for the transformation of a finishing mill unit with three or less stands. When this temporary roller path is applied to the transformation of a finishing mill unit with seven or more stands, during the production process, the overall straightness of the idler roller surface often does not meet the requirements, resulting in poor running accuracy of the rolling equipment. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: to provide a construction method for a temporary roller path in rolling line transformation, which ensures that the overall straightness of the idler roller surface of the temporary roller path meets the requirements during the production process.

[0006] The technical solution adopted by the present invention to solve its technical problems is:

[0007] A construction method for a temporary roller path in rolling line transformation includes: removing the old roller path, and fixing both ends of the temporary steel bridge on the inlet reserved section and the outlet reserved section at both ends of the old foundation respectively; presetting a temporary support section at the middle position of the old foundation, and fixing a temporary support on the temporary support section to support the temporary steel bridge; removing the part of the old foundation except the inlet reserved section, the temporary support section and the outlet reserved section to form an emptied area; installing a steel support in the emptied area to support the temporary steel bridge, and then removing the temporary support and the temporary support section of the old foundation.

[0008] Further, before removing the part of the old foundation except the inlet reserved section, the temporary support section and the outlet reserved section, it further includes: longitudinally cutting at the edge positions of the inlet reserved section, the temporary support section and the outlet reserved section on the old foundation to form cutting seams.

[0009] Further, steel supports are installed in the emptied areas on both sides of the temporary support section to support the temporary steel bridge.

[0010] Further, the steel support includes an operating side column installed on the operating side, a driving side column installed on the driving side, and a top crossbeam fixed to the tops of the operating side column and the driving side column for supporting the temporary steel bridge.

[0011] Further, an operating side bearing platform is fixed to the bottom of the operating side column; the operating side bearing platform is fixed on the bearing stratum of the new foundation floor slab.

[0012] Further, the bottom of the driving side column is fixed on the old foundation floor slab.

[0013] The beneficial effects of the present invention are as follows:

[0014] A construction method for a temporary roller path in a rolling line transformation provided by an embodiment of the present invention uses a temporary steel bridge as a temporary roller path to replace the old roller path, so that the transformation work of the new rolling mill foundation can be achieved while production is in progress, achieving the purpose of shortening the production stop time and reducing the output loss of the production plant; before demolishing the old foundation, the temporary steel bridge is supported by the temporary support section and the temporary support of the old foundation, and when demolishing the old foundation, the steel support is used to replace the temporary support section and the temporary support to continue supporting the temporary steel bridge; in this way, by increasing the support points, the temporary steel bridge is transformed from a single-span structure with a large span to a two-span or more structure with a small span, greatly reducing the elastic deflection of the temporary steel bridge, not only making the structural deflection caused by the dead loads such as the self-weight of the temporary steel bridge and the strip steel on the idler surface meet the design requirements, but also avoiding the harm of excessive resonance amplitude caused by the dynamic load during equipment operation, thereby ensuring that the overall straightness of the idler surface on the temporary steel bridge meets the requirements and improving the operation accuracy of the rolling equipment. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art; obviously, the drawings described below are only some embodiments recorded in the present invention, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 is a state diagram when the temporary steel bridge is supported by a temporary support;

[0017] Figure 2 is a state diagram when the part of the old foundation except the entrance retention section, the temporary support section and the exit retention section is demolished to form a demolished area;

[0018] Figure 3 is a state diagram after the temporary support and the temporary support section are demolished;

[0019] Figure 4It is a schematic structural diagram of a steel support.

[0020] In the figure, the reference numerals are: 1 - temporary steel overpass, 2 - old foundation, 3 - temporary support, 4 - emptied area, 5 - steel support, 6 - bearing stratum of new foundation bottom slab, 7 - entrance support, 8 - exit support, 21 - entrance reserved section, 22 - exit reserved section, 23 - temporary support section, 24 - cutting seam, 25 - old foundation bottom slab, 51 - operating side column, 52 - driving side column, 53 - top cross beam, 54 - operating side bearing platform, 241 - entrance old foundation cutting seam, 242 - intermediate old foundation entrance cutting seam, 243 - intermediate old foundation exit cutting seam, 244 - exit old foundation cutting seam. Detailed implementation manner

[0021] To enable those skilled in the art to better understand the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0022] During the transformation of the rolling production line, after the old roller table is removed, a temporary roller table is often used to replace the old roller table, so that the transformation work of the new rolling mill foundation can be realized while production, achieving the purpose of shortening the shutdown time and reducing the output loss of the production plant. The existing temporary roller table is a prefabricated temporary steel overpass, which mainly includes a bridge body and a plurality of idlers installed on the bridge body; both ends of the bridge body are respectively fixed on the reserved sections at both ends of the old foundation.

[0023] However, the existing temporary roller table is mainly for the transformation of three - stand or less finishing mills. When this kind of temporary roller table is applied to the transformation of seven - stand or more finishing mills, during the production process, the overall straightness of the idler roller surface often does not meet the requirements, resulting in poor running accuracy of the rolling equipment. The applicant's research finds that there are mainly two reasons for the overall straightness of the idler roller surface not meeting the requirements: 1. The span of the temporary steel overpass is too long, and the weight of the idlers and the strip steel on it generates a superimposed load, making the elastic deflection of the temporary steel overpass too large; 2. The dynamic load during equipment operation causes the resonance amplitude of the temporary steel overpass to be too large.

[0024] Therefore, in order to solve the problem that the overall straightness of the idler roller surface of the temporary roller table during the production process does not meet the requirements, the embodiment of the present invention provides a construction method for the temporary roller table in the rolling line transformation.

[0025] See Figures 1 to 4 , a construction method for the temporary roller table in the rolling line transformation provided by the embodiment of the present invention includes:

[0026] S1. Demolish the old roller table, and fix the two ends of the temporary steel bridge 1 to the entrance reserved section 21 and the exit reserved section 22 at both ends of the old foundation 2 respectively; preset a temporary support section 23 at the middle position of the old foundation 2, and fix a temporary support 3 on the temporary support section 23 to support the temporary steel bridge 1;

[0027] S2. Demolish the parts on the old foundation 2 except the entrance reserved section 21, the temporary support section 23 and the exit reserved section 22 to form a hollowed-out area 4; install a steel support 5 in the hollowed-out area 4 to support the temporary steel bridge 1, and then demolish the temporary support 3 and the temporary support section 23 of the old foundation 2.

[0028] The temporary steel bridge 1 is used as a temporary roller table to replace the old roller table, and mainly includes a bridge body and a number of idlers installed on the bridge body. The temporary steel bridge 1 can be prefabricated in a factory and then transported to the construction site, or can be prefabricated in advance at the construction site. See Figure 1 , both ends of the old foundation 2 are respectively provided with an entrance reserved section 21 and an exit reserved section 22. After the old roller table on the old foundation 2 is demolished, the entrance end of the temporary steel bridge 1 is fixed to the entrance reserved section 21 of the old foundation 2 through an entrance support 7, and the exit end of the temporary steel bridge 1 is fixed to the exit reserved section 22 of the old foundation 2 through an exit support 8.

[0029] The middle position of the old foundation 2 refers to any position between the entrance reserved section 21 and the exit reserved section 22, and does not specifically refer to the position on the old foundation 2 that is equidistant from the entrance reserved section 21 and the exit reserved section 22. After presetting the temporary support section 23 at the middle position of the old foundation 2, the temporary support 3 can be fixed on the temporary support section 23, and then the temporary steel bridge 1 is supported through the temporary support 3. Among them, one, two or more than two temporary support sections 23 can be preset on the old foundation 2, and one, two or more temporary supports can be fixed on each temporary support section 23. In this way, by increasing the number of support points, the temporary steel bridge 1 is transformed from a single-span structure with a large span into a two-span or more than two-span structure with a small span, greatly reducing the elastic deflection of the temporary steel bridge.

[0030] For example, during the transformation of the seven-stand finishing mill, the length of the temporary steel bridge 1 is 45 - 50 meters. After setting a temporary support section 23 at the exact middle position of the old foundation 2 and fixing a temporary support 3 on the temporary support section 23 to support the temporary steel bridge 1, the single-span length of the temporary steel bridge 1 can be changed to 20 - 25 meters after becoming smaller. According to the calculated superimposed load generated by the self-weight of the structure and the upper roller table and strip steel weight, the deflection of the temporary steel bridge 1 meets the requirements of structural deformation and equipment operation accuracy.

[0031] See Figure 2, when demolishing the old foundation 2, first demolish the part of the old foundation 2 except the entrance reserved section 21, the temporary support section 23 and the exit reserved section 22 to form a hollowed-out area 4; in this way, the steel support 5 can be installed in the hollowed-out area 4, and the steel support 5 is used to replace the temporary support section 23 and the temporary support 3 to support the temporary steel bridge 1, and then the temporary support 3 and the temporary support section 23 of the old foundation 2 are demolished, as Figure 3 shown, thus completing the demolition work of the old foundation 2. When the demolition of the old foundation 2 is completed, the new foundation can be constructed in the hollowed-out area 4, and the steel support 5 is wrapped in the new foundation. When the temporary steel bridge 1 is demolished in the next stage of renovation construction, the redundant exposed part of the steel support 5 can be cut and demolished. In this embodiment, see Figure 2 , steel supports 5 are installed in the hollowed-out areas 4 on both sides of the temporary support section 23 to support the temporary steel bridge 1.

[0032] See Figure 4 , the steel support 5 includes an operating side column 51 installed on the operating side, a drive side column 52 installed on the drive side, and a top cross beam 53 fixed at the tops of the operating side column 51 and the drive side column 52 to support the temporary steel bridge 1. The steel support 5 can be prefabricated in the factory and then transported to the construction site, or can be prefabricated in advance at the construction site. The bottom of the operating side column 51 is fixed with an operating side bearing platform 54; the operating side bearing platform 54 is fixed on the bearing layer 6 of the new foundation floor slab. The bottom of the drive side column 52 is fixed on the old foundation floor slab 25, and the old foundation floor slab 25 is provided with lapped steel bars for combination with the new foundation.

[0033] A temporary roller path construction method for rolling line renovation provided by an embodiment of the present invention uses the temporary steel bridge 1 as a temporary roller path to replace the old roller path, so that the renovation work of the new rolling mill foundation can be realized while production is in progress, achieving the purpose of shortening the production stop time and reducing the output loss of the production plant; before demolishing the old foundation 2, the temporary support section 23 and the temporary support 3 of the old foundation 2 are used to support the temporary steel bridge 1, and when demolishing the old foundation 1, the steel support 5 is used to replace the temporary support section 23 and the temporary support 3 to continue to support the temporary steel bridge 1; in this way, by increasing the support points, the temporary steel bridge 1 is transformed from a single-span structure with a large span to a multi-span structure with a small span, greatly reducing the elastic deflection of the temporary steel bridge 1, not only making the structural deflection caused by the dead loads such as the self-weight of the temporary steel bridge and the strip steel on the roller surface meet the design requirements, but also avoiding the harm of excessive resonance amplitude caused by the dynamic load during equipment operation, thereby ensuring that the overall straightness of the roller surface on the temporary steel bridge 1 meets the requirements and improving the operation accuracy of the rolling equipment.

[0034] A temporary roller table construction method for rolling line transformation provided by an embodiment of the present invention can optimize and reduce the cross-sectional size of the temporary steel bridge 1 by increasing the support points, converting the single-span structure with a large span into a multi-span structure with a small span, so as to achieve the purpose of saving steel. At the same time, it can struggle to form the construction of an ultra-long temporary steel bridge 1 to meet the requirements of online construction for large-scale technological transformation of the hot rolling production line, and greatly save the shutdown time.

[0035] In an embodiment of the present invention, before removing the part of the old foundation 2 except the entrance reserved section 21, the temporary support section 23, and the exit reserved section 22, it further includes: longitudinally cutting at the edge positions of the entrance reserved section 21, the temporary support section 23, and the exit reserved section 22 on the old foundation 2 to form cutting seams 24.

[0036] Exemplarily, referring to Figure 1 , use a wire saw to longitudinally cut at the right edge of the entrance reserved section 21 to form an entrance old foundation cutting seam 241; use a wire saw to longitudinally cut at the left edge of the temporary support section 23 to form an intermediate old foundation entrance cutting seam 242; use a wire saw to longitudinally cut at the right edge of the temporary support section 23 to form an intermediate old foundation exit cutting seam 243; use a wire saw to longitudinally cut at the left edge of the exit reserved section 22 to form an exit old foundation cutting seam 244.

[0037] In an embodiment of the present invention, a wire saw is used to longitudinally cut at the edge positions of the entrance reserved section 21, the temporary support section 23, and the exit reserved section 22 on the old foundation 2 to form cutting seams 24, which physically separates the entrance reserved section 21, the temporary support section 23, and the exit reserved section 22 of the old foundation from other areas to be demolished, greatly reducing the influence of the traditional demolition and crushing vibration on the operation accuracy of surrounding operating equipment. At the same time, due to the physical separation of the demolition range, the demolition construction can choose hydraulic crushing, wire saw cutting, etc. without being restricted by a single method, which is convenient to operate and reduces the demolition cost.

[0038] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A construction method for a temporary roller table in the transformation of a rolling line, characterized in that, Including: Demolish the old roller table, and fix the two ends of the temporary steel bridge (1) to the entrance reserved section (21) and the exit reserved section (22) at the two ends of the old foundation (2) respectively; preset a temporary support section (23) at the middle position of the old foundation (2), and fix a temporary support (3) on the temporary support section (23) to support the temporary steel bridge (1). Demolish the part of the old foundation (2) except the entrance reserved section (21), the temporary support section (23) and the exit reserved section (22) to form a hollowed-out area (4); install a steel support (5) in the hollowed-out area (4) to support the temporary steel bridge (1), and then demolish the temporary support (3) and the temporary support section (23) of the old foundation (2). The steel support (5) includes an operating side column (51) installed on the operating side, a driving side column (52) installed on the driving side, and a top cross beam (53) fixed at the tops of the operating side column (51) and the driving side column (52) to support the temporary steel bridge (1).

2. The construction method of the temporary roller table for the rolling line transformation according to claim 1, characterized in that, Before demolishing the part of the old foundation (2) except the entrance reserved section (21), the temporary support section (23) and the exit reserved section (22), it also includes: Perform longitudinal cutting at the edge positions of the entrance reserved section (21), the temporary support section (23) and the exit reserved section (22) on the old foundation (2) to form cutting seams (24).

3. The construction method of the temporary roller table for the rolling line transformation according to claim 1, characterized in that, Steel supports (5) are installed in the hollowed-out areas (4) on both sides of the temporary support section (23) to support the temporary steel bridge (1).

4. The construction method of the temporary roller table for the rolling line transformation according to claim 1, characterized in that The bottom of the operating side column (51) is fixed with an operating side bearing platform (54); the operating side bearing platform (54) is fixed on the bearing layer (6) of the new foundation bottom plate.

5. The construction method of the temporary roller table for the rolling line transformation according to claim 1, characterized in that The bottom of the driving side column (52) is fixed on the old foundation bottom plate (25).

Images