Method for Controlling and Measuring the Rolling Centerline of Plate Hot Rolling Production Line Equipment

Abstract

This invention discloses a method for controlling and measuring the rolling centerline of a hot-rolled sheet metal production line. The method includes the following steps: S1, setting up a construction control network: 1) selection of control points, 2) precise measurement of control points; S2, docking with the existing equipment foundation; S3, coordinate system transformation; S4, base plate construction control; S5, construction of the observation platform; S6, control of pre-embedded bolts on the top plate: 1) Construction of the equipment foundation and bolt fixing frame, at least three elevation points are measured on the same plane and cross-checked; 2) For the upper structure and bolt control line, using the rolling centerline on the observation platform as a reference, the long sides of both sides of the rolling line are selected as the orientation direction, and the centerline is projected using the rectangular coordinate method. The elevation of the bolt control frame is measured using a level. This invention ensures the straightness of the rolling line and the perpendicularity of the heating furnace centerline, reduces the internal calculation process, improves work efficiency, and enhances the control accuracy of the rolling line foundation construction, meeting the equipment installation accuracy requirements.

Description

Technical Field

[0001] This invention relates to building construction, and in particular to a method for controlling and measuring the rolling centerline of the foundation of a hot-rolled sheet metal production line. Background Technology

[0002] The 1580mm hot-rolled sheet metal production line project is located in a coastal area. The total length of the hot-rolled production line is approximately 820 meters, with the rolling line itself occupying about 540 meters (including the heating furnace area, roughing rolling area, finishing rolling area, and laminar flow coiling area), and the finished product warehouse occupying about 260 meters. The main equipment foundations are located underground. The production line has numerous pieces of equipment and requires high installation precision, thus demanding stricter control over the pre-embedded bolts. The investment is substantial, the construction period is tight, and there are connections with existing continuous casting equipment. The project is divided into four sections for construction. Because the hot-rolled line's process layout is very compact, the segmented construction will result in varying construction progress, increasing the difficulty of construction control and measurement.

[0003] Generally, based on the construction situation and the control points provided by the client, these control points are transferred to the construction site, and the polar coordinate layout method is used for construction control. However, due to the long length of the hot rolling production line, increasing the number of transfer points for measurement can easily lead to accumulated errors and reduced control accuracy. This is especially true when controlling embedded bolts; deviations can prevent equipment installation. In coastal areas, poor geological conditions can easily cause control point shifts. Furthermore, surrounding machinery and steel processing areas can obstruct the line of sight, making measurement difficult. This project uses a geodetic coordinate system, which has a rotational angle with true north. Using polar coordinate layout increases the amount of data calculation in the office, leading to low efficiency and a higher probability of errors. Summary of the Invention

[0004] This invention aims to solve the above-mentioned technical problems, thereby providing a method for controlling and measuring the rolling centerline of the foundation of a hot rolling production line for sheet metal, and improving the control accuracy of the rolling line foundation construction.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows:

[0006] A method for controlling and measuring the rolling centerline of a hot-rolled sheet metal production line includes the following steps:

[0007] S1. Establishment of construction control network

[0008] 1) Selection of control points

[0009] The control network for the rolling mill construction area consists of four plane control points. Control points are pre-selected at both ends of the rolling mill centerline, and elevation control points are selected on the side wall of the engineering piles on the south side of the foundation pit.

[0010] 2) Precise measurement of control points

[0011] Based on the control network results, the intersection point of the rolling center line and the longitudinal axis with a whole dimension relationship was measured by polar coordinate method. That is, the control points at both ends of the rolling line. The distance between the two points was checked. The elevation control was measured back and forth according to the technical requirements of the third-order leveling route, and the ±0 elevation was transferred to the engineering pile on the south side of the foundation pit.

[0012] S2, Interconnect with existing equipment foundation

[0013] Before construction, the center line of the original continuous casting equipment was measured using a total station, and the center line of the furnace roller conveyor was laid out and compared according to the control points.

[0014] S3, Coordinate System Transformation

[0015] Based on the design drawings, the control points are rotated at an angle relative to the design axis so that the rolling centerline is orthogonal to the true north direction. An independent coordinate system for this project is established by assuming coordinates.

[0016] S4. Base Slab Construction Control

[0017] After the foundation layer is poured, the main axis is projected on the foundation layer, steel bars are laid, and the elevation is transferred to the bottom of the foundation pit. After the bottom slab is poured, the main axis is projected onto the bottom slab based on the control points at both ends of the rolling center line.

[0018] S5. Construction of the observation platform

[0019] Multiple observation platforms were set up at the intersection of the rolling centerline and the centerlines of several important equipment. The design points on the observation platforms were laid out using the polar coordinate method of a total station, and the points were normalized and adjusted to the design values ​​using the axis method.

[0020] S6. Control of pre-embedded bolts in the top plate

[0021] 1) For the construction of equipment foundations and bolt fixing frames, at least three elevation points should be measured on the same plane layer and cross-checked;

[0022] 2) For the superstructure and bolt control frame, the rolling center line on the observation platform is used as the reference. The long sides of the rolling line on both sides are selected as the orientation direction. The center line is projected using the rectangular coordinate method. The elevation of the bolt control frame is measured using a level. The elevation of the top surface of the bolt is controlled between 0 mm and +15 mm.

[0023] Compared with the prior art, the present invention, which adopts the above technical solution, has the following beneficial effects:

[0024] A construction control network was established, and the two ends of the rolling centerline were fixed. The foundation construction of the rolling centerline was controlled by establishing a straight line between the two points. An independent coordinate system (assumed coordinate method) was established for the construction of this project. Angle and distance layout was carried out to ensure the straightness of the rolling line and the perpendicularity of the heating furnace centerline direction. This reduced the internal calculation process, improved work efficiency, and improved the control accuracy of the rolling line foundation construction to meet the equipment installation accuracy requirements.

[0025] Furthermore, the optimized solution of the present invention is:

[0026] The plane control point is located at the top of the pile of the electrical room engineering pile on the north side of the rolling line.

[0027] The control points at both ends of the rolling line are reinforced concrete structures, with the top surface 200 mm above the ground and ground smooth.

[0028] During the construction of the equipment foundation pad, components were implanted at the four corners of the platform, allowing the observation platform to take root and embed itself in the ground.

[0029] In step S4, each section shall have at least one elevation point, and the pre-embedded components shall be set with uniform elevation, and the top surface elevation shall be controlled between 0 and -5mm. Attached Figure Description

[0030] Figure 1 This is a construction process diagram of an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the control points at both ends of the rolling mill according to an embodiment of the present invention;

[0032] Figure 3 yes Figure 2 Top view;

[0033] Figure 4 This is an elevation view of the observation platform according to an embodiment of the present invention;

[0034] Figure 5 This is the top view of Figure 4.

[0035] In the diagram: 1. Rolling center line; 2. Control points at both ends of the rolling line; 2. Concrete; 2. Reinforcing steel; 2. Scaffolding; 3. Observation platform; 3. I-beam; 3. Angle steel; 3. Protective fence; 4. Center line of important equipment; 5. Excavation edge line of equipment foundation; 6. Construction control points. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0037] See Figure 1 This embodiment describes a method for controlling and measuring the center line of the basic rolling mill in a hot-rolled sheet metal production line, which is carried out according to the following steps:

[0038] S1. Establishment of construction control network

[0039] 1) Selection of control points

[0040] According to the design, a total of 6 control points are set up in the rolling mill construction area. The points are located on the top of the engineering piles of the electrical room on the north side of the relatively stable rolling mill. According to the construction schedule, the electrical room needs to be excavated after the rolling mill foundation is completed. The point locations are marked with cross lines and painted red paint diagonally, and the point numbers are marked as KZ1-KZN. The construction site is located in a coastal area with soft soil. The site is also affected by pile driving operations and mechanical equipment disturbances, which can easily cause the control points to shift. Therefore, concrete control piers are not used. Instead, the control points are located on the top of the engineering piles above the foundation pit, which is relatively stable.

[0041] Pre-select a control point 2 at each end of the rolling line centerline 1. Excavate a 1m x 1m, 1.5m deep pit. Vertically embed four 2m long, 500mm exposed steel bars 2-2 at the bottom of the pit. The diameter of the steel bars 2-2 is 20mm. Pour concrete 2-1 into the pit. The top surface of concrete 2-1 is 200mm above the ground and is ground smooth (see...). Figure 2 , Figure 3 Scaffolding 2-3 was erected around concrete 2-1. Elevation control points were selected on the south side of the foundation pit, on the side wall of the engineering piles. These points were marked with inverted triangles painted red and numbered G1-GN.

[0042] 2) Precise measurement of control points

[0043] Based on the control points provided by Party A, the planar control was implemented according to the technical requirements of the first-order electromagnetic wave ranging closed traverse. The observed data were adjusted to obtain the final results, which were then checked. Based on the control network results, the intersection point of the rolling center line 1 and the longitudinal axis was determined by polar coordinate method, i.e., the control points 2 at both ends of the rolling line. The distance between the two points was checked. The elevation control was carried out by reciprocating the measurement according to the technical requirements of the third-order leveling route, and the ±0 elevation was transferred to the engineering pile on the south side of the foundation pit. The technical requirements for horizontal angle observation are shown in Table 1, the main technical requirements for distance measurement are shown in Table 2, the accuracy requirements for the planar control network are shown in Table 3, the main technical requirements for leveling instrument observation are shown in Table 4, and the accuracy requirements for elevation control are shown in Table 5. When measuring the side length, the air pressure, temperature, and additive / multiplicative constants were entered into the instrument, and the meteorological, tilt, and instrument additive / multiplicative constant corrections were directly performed. The side length was measured once in each direction.

[0044] Table 1

[0045]

[0046] Table 2

[0047]

[0048] Table 3

[0049]

[0050] Table 4

[0051]

[0052] Table 5

[0053]

[0054] S2, Interconnect with existing equipment foundation

[0055] Before construction, the center line of the original continuous casting equipment was measured using a total station. The center line of the furnace feed roller was projected according to the coordinates of the control network. The deviation was checked with the center line of the original continuous casting equipment. The two points were compared and the deviation value was reported to the supervision unit and the owner. The center line of the furnace feed roller was laid out according to the control points.

[0056] S3, Coordinate System Transformation

[0057] Because the design uses a geodetic coordinate system, which has a rotational angle with true north, the calculation of coordinate values ​​during construction becomes more difficult, increasing the probability of errors and significantly reducing efficiency. Based on the design drawings, computer-aided drafting software rotates the entire axis and control network, and rotates the control points relative to the design axis to ensure that the direction of rolling centerline 1 is orthogonal to true north. The intersection of axis 1 on the design drawings and rolling centerline 1 is selected as the reference, and an independent coordinate system for this project is established using assumed coordinates.

[0058] S4. Base Slab Construction Control

[0059] Based on the control network, the main axis is measured to guide the construction of the foundation layer. After the foundation layer is poured, the main axis is projected onto the foundation layer, and detailed dimensions are laid out to guide the laying of reinforcing bars. The elevation is transferred to the bottom of the foundation pit to ensure that each section has at least one elevation point, and is checked regularly. The elevation of the embedded components is standardized, and the top surface elevation is controlled within the range of 0 to -5 mm. After the bottom slab is poured, the main axis is projected onto the bottom slab based on the control points 2 at both ends of the rolling centerline 1.

[0060] S5. Construction of the observation platform

[0061] The center line of the equipment foundation of the rolling production line is relatively long, and there are many bolts and embedded parts for the foundation of important equipment. Based on the project situation and existing measurement data, a comprehensive design is carried out with the principle of controlling the center line of the foundation of important equipment. It is necessary to ensure that the observation platform 3 is visible to the external control point, and that the observation platforms 3 are visible to each other.

[0062] Three observation platforms 3 are set up at the intersection of the rolling centerline 1 and the centerlines of the three important equipment. Figure 4 , Figure 5As shown in the diagram, according to the engineering construction drawings and layout requirements, observation platform 3 adopts a steel frame platform, with a height 1.5 meters higher than the foundation platform. To ensure the stability of observation platform 3 and reduce the impact of swaying on observation quality, the four corner frame structures use I-beams 3-1, and the diagonal bracing uses 75×8 angle steel 3-2 for fixation. During the construction of the equipment foundation pad, the four corner I-beams 3-1 are embedded into the ground, rooted to a depth equal to or greater than 1.5 meters. The parts of the structure in contact with the pad are reinforced with concrete at least 500 mm thick. The four corner I-beams 3-1 should be diagonally pulled outwards to the pad for reinforcement. A 50 mm thick concrete layer is poured on the platform surface, and a 1.5-meter high protective fence 3-3 is installed around the perimeter to prevent personnel from falling. Observation platform 3 is strictly prohibited from being used as scaffold support or for fixing reinforcing bars.

[0063] The rolling centerline is projected onto observation platform 3, and angle and distance checks are performed. The distance deviation is within 2mm. The design points on observation platform 3 are laid out using the polar coordinate method with a total station. The points are then normalized and adjusted to the design values ​​using the axis method. The instrument is set up on observation platform 3, and the prism is set up at control points 2 at both ends of the rolling line as the direction. Angle and distance adjustments are made, and after adjustment, the angles and side lengths are re-measured and checked. Once correct, the points are marked with a crosshair and diagonally sprayed with red paint. The deviation of points on the long axis from the straight line should be within 180°±4". The angular measurement error for horizontal angle observations should not exceed 2.5″. Side length observations are performed using an electromagnetic distance measuring instrument, with one round trip measurement each time. Corrections for meteorological and instrumental additive and multiplicative constants should be made. Observation technical requirements are the same as in Tables 1, 2, and 3 above.

[0064] S6. Control of pre-embedded bolts in the top plate

[0065] 1) For the construction of equipment foundations and bolt fixing frames, at least three elevation points should be measured on the same plane layer and cross-checked. After verification, the difference between the three points should be within the tolerance limit. The average value should be taken as the benchmark point for the elevation in the construction of the plane and marked with a red triangle "▼". The elevation should also be marked for easy use in construction.

[0066] 2) For the superstructure and bolt control lines, the rolling centerline on observation platform 3 is used as the reference. The long sides of both sides of the rolling line are selected as the orientation direction. The centerline is projected using the rectangular coordinate method. For areas where this is not feasible, the polar coordinate method can be used. The number of measurements is increased, and the average point is taken as the final control point / line. The elevation of the bolt control frame is measured using a level, with the bolt top surface elevation controlled between 0 mm and +15 mm. Each step of the surveying should be self-checked and recorded. The next step of construction can only proceed after the self-check is passed.

[0067] This invention solves the problem of the rotation angle between the geodetic coordinate system used in the design drawings and the true north direction. It also solves the problems of production lines being relatively far apart, being constructed in multiple sections with different construction progress, and having connection between sections, which can easily lead to turning angles. This invention effectively reduces the amount of calculation and lowers the probability of errors caused by calculation.

[0068] This invention, based on control points provided by the client, selects control points along the outer side of the production line pit, establishes a control network, and performs closed traverse measurements. An independent coordinate system is established by rotating the design drawings and control network as a whole. Based on the control network and coordinate system design, two semi-permanent control points are measured at both ends of the rolling line direction. These two points form a straight line to control the rolling line construction. Due to the long distance of the production line, three observation platforms are evenly distributed in the middle for denser control. Using the semi-permanent control points at both ends as a reference, the main axis points are projected onto the observation platforms at intervals and fine-tuned to ensure they are aligned. Other control lines are controlled using the right-angle method.

[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. All equivalent structural changes made based on the description and drawings of the present invention are included within the scope of the present invention.

Claims

1. A method for controlling the rolling center line of a hot rolling production line equipment foundation, comprising the following steps: S1, laying out a construction control network 1) Selection of control points Four planar control points are laid out in the rolling line construction area control network, two end control points of the rolling line are preselected at both ends of the rolling center line, and the elevation control point is selected on the south side of the foundation pit engineering pile side wall; 2) Precise measurement of control points According to the control network results, the intersection of the rolling center line and the longitudinal axis is measured by the polar coordinate method, that is, the two end control points of the rolling line, the distance between the two points is checked, and the ±0 elevation is introduced to the south side of the foundation pit engineering pile according to the three-order leveling route technical requirements; S2, interfacing with the original equipment foundation Before construction, the original continuous casting equipment center line is introduced by using a total station, and the furnace roller center line is lofted according to the planar control points and compared; S3, coordinate system conversion According to the design drawing, the planar control points are angle-rotated with the design axis, so that the rolling center line direction is orthogonal to the true north direction, and the independent coordinate system of the project is established by assuming coordinates; S4, bottom plate construction control After the cushion is poured, the main axis is projected on the cushion, the reinforcement is laid, and the elevation is introduced to the bottom of the foundation pit. After the bottom plate is poured, the main axis is projected onto the bottom plate according to the rolling end control points; S5, construction of observation platform A plurality of observation platforms are set at the intersection of the rolling center line and the center lines of a plurality of important equipment, the design points on the observation platform are lofted by the total station polar coordinate method, and the points are adjusted to the design value by using the axis method; S6, top plate embedded bolt control 1) Equipment foundation and bolt fixing frame construction, at least three elevation control points are introduced on the same planar layer, and mutual checking is performed; 2) Upper structure and bolt control frame line, taking the rolling center line on the observation platform as the standard, selecting the long side on both sides of the rolling center line as the directional direction, projecting the center line by using the rectangular coordinate method, and copying the bolt control frame elevation by using the level, the bolt top surface elevation is controlled at 0 mm to + 15 mm.

2. The method of claim 1, wherein: The planar control point is located on the top of the rolling line north side electrical room engineering pile.

3. The method of claim 1, wherein: The rolling line end control point is a reinforced concrete structure with a top surface 200 mm higher than the ground and polished and smoothed.

4. The method of claim 1, wherein: The four corner position components of the observation platform are implanted during the construction of the equipment foundation cushion, and the observation platform is rooted and embedded underground.

5. The method of claim 1, wherein: In step S4, at least one elevation control point is provided for each section, the embedded components are uniformly measured and set, and the top surface elevation is controlled at 0 to -5 mm.

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