A method for checking the installation and positioning of a ring-lift corbel

Abstract

The present invention discloses a method for checking the installation and positioning of a ring-hanging corbel, which includes setting a first reference point at the equipment gate, setting up a total station, locating the first corbel installation position opposite, drilling a hole, and hoisting the equipment; measuring the axis and upper surface elevation of the first corbel; setting the upper surface of the first corbel as a second reference point as the elevation reference point; measuring the coordinates of the second reference point by the total station at the first reference point, measuring the vertical angle and distance, and calculating the elevation of the elevation reference point; setting the total station at the second reference point, looking back at the first reference point, and locating the second corbel installation position that is one-third of the distance from the second reference point to the circumference; drilling a hole at the second corbel installation position, hoisting the equipment, measuring the axis and upper surface elevation of the second corbel, setting the upper surface of the second corbel as a third reference point after passing the test, and then measuring the fourth reference point by the third reference point, and then locating the remaining corbel installation positions. The present invention has high measurement accuracy and solves the problem of high requirements for the installation elevation and flatness of the corbel.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power plant construction, and in particular to a method for installing, positioning and checking a ring-hanging corbel. Background Art

[0002] With the development of the national economy, the demand for energy is increasing, which has given nuclear power construction in my country a broad space and scale for development.

[0003] The brackets in nuclear power plants are used to support the bracket beams and are installed on the steel lining of the containment vessel. The steel lining is circular, and the brackets are elevated high above the ground. During stakeout, a centrally located tower is typically used, with a total station mounted on top. Position lines are laid out according to angle and azimuth lines. The quality and progress of the bracket installation are directly impacted by the effectiveness of measurement and control.

[0004] Due to the tower's height and poor stability, precision requirements are difficult to achieve. The brackets are extremely densely distributed, subjecting them to significant dynamic loads during the ring-lift operation, necessitating stringent installation quality requirements. Reducing errors and improving accuracy during the installation of steel-lined ring-lift brackets remains a challenge. Furthermore, the containment concrete has not yet been poured during the installation of the brackets, causing them to tilt forward and making adjustment difficult, complicating measurement. The effectiveness of measurement control directly impacts the quality and progress of the bracket installation. Summary of the Invention

[0005] The invention aims to provide a ring-hanging corbel installation positioning inspection method which is easy to use, can measure step by step and has high measurement accuracy.

[0006] The present invention is achieved through the following technical solutions:

[0007] A method for installing and positioning a ring-hanging corbel includes the following steps:

[0008] Set the first reference point at the equipment gate, set up a total station at the first reference point, and locate the first corbel installation position opposite the first reference point; drill a hole at the first corbel installation position, hoist and install the first corbel, and check its position;

[0009] Measure the axis and upper surface elevation of the first corbel; if qualified, set the upper surface of the first corbel as the second reference point, which serves as the plane and elevation reference point; determine the coordinates of the second reference point using the total station at the first reference point, measure the vertical angle and distance, and calculate the elevation of the elevation reference point;

[0010] Set up the total station at the second reference point, look back at the first reference point, and locate the second corbel installation position that is one-third of the circumference of the ring hanging from the second reference point; drill a hole at the second corbel installation position, hoist and install the second corbel, and check the position; measure the axis and upper surface elevation of the second corbel; if qualified, set the upper surface of the second corbel as the third reference point; measure the coordinates of the third reference point using the total station at the second reference point, and measure the elevation of the third reference point;

[0011] Set up the total station at the third reference point, look back at the second reference point, locate the third corbel installation position that is one-third of the circumference of the ring hanging from the second reference point, drill a hole at the third corbel installation position, hoist and install the third corbel, and check the position. Measure the axis and upper surface elevation of the third corbel. If qualified, set the upper surface of the third corbel as the fourth reference point. Use the total station at the third reference point to determine the coordinates of the fourth reference point and measure the elevation of the fourth reference point.

[0012] The second reference point, the third reference point and the fourth reference point are used to measure and check the distance. After passing the measurement, the first to fourth reference points are used to locate the installation positions of the remaining corbels respectively.

[0013] A plane reference point tooling is set at each reference point; a plane reference point tooling is set at each reference point; the plane reference point tooling of the first reference point is supported horizontally by channel steel as a mobile base, with supporting angle steels on both sides, a forced centering disk set on the upper surface, a centering hole set in the center of the forced centering disk, and the centering hole is used to install the lower bolts of the total station; fixed steel bars are set at the bottom of the channel steel; the fixed steel bars are threadedly connected to the forced centering disk, and the bottom is fixed to the channel steel by nuts and gaskets, the plane reference point tooling of the second, third and fourth reference points is composed of a forced centering base, a forced centering disk is set on the top of the forced centering base, a centering hole is set in the center, and the centering hole is used to install the lower bolts of the total station; three fixed steel bars are set at the bottom of the forced centering base; the fixed steel bars are threadedly connected to the forced centering base, and the lower part is spot welded to the surface of the corbel.

[0014] Select two common reference points inside and outside the circumference of the ring hanger as check points. The common reference points are known control points. Use the total station at the first reference point to look back at the first common reference point, measure the distance and direction angle, aim at the second common reference point, measure the distance and azimuth, calculate the coordinates of the first reference point, input the calculated coordinate values, re-aim at the second common reference point, set the azimuth angle, and set the elevation value.

[0015] By locating the center of the reactor building and setting the orientation line, a coordinate system is established to determine the orientation angle of the bracket in the reactor building. The X-axis is the 0°-180° axis of the coordinate system plane, the Y-axis is the 270°-90° axis of the coordinate system plane, and the Z-axis is the center axis of the reactor.

[0016] When the hole is opened at the installation position of the corbel, the coordinates of the upper point on the wall where the corbel is designed to be installed are (X, Y, H), and the calculation is:

[0017] R=(X-X0)COSα+(Y-Y0)SINα

[0018] T=-(X-X0)SINα+(Y-Y0)COSα

[0019] Where (X0, Y0) is the coordinate of the center of the reactor building; α is the azimuth angle of the bracket in the reactor building; R is the distance from the wall where the bracket is designed to be installed to the center of the reactor building; and T is the azimuth deviation value.

[0020] If the T value is greater than the accuracy threshold, move the bracket installation position in the opposite direction of the deviation value, re-measure the coordinates and calculate the deviation value. If it meets the requirements, mark it as the upper point.

[0021] Use the same method to measure the coordinates of the lower point on the wall where the corbel is designed to be installed, mark the lower point, connect the upper point and the lower point, measure the elevation lines on the left and right of the connecting line, mark the connecting line, and drill a hole according to the size of the corbel; hoist and install the corbel.

[0022] Use the inspection angle steel as the inspection tool, and the length of the inspection angle steel is the width of the contact point between the inner side of the corbel and the steel lining plate; set two measuring reflectors on the side of the inspection angle steel, and the length of the measuring reflector is the width of the outer side of the corbel. The two measuring reflectors are symmetrically distributed around the center of the inspection angle steel, and the bottom of the measuring reflector is flush with the bottom of the inspection angle steel; during inspection, place the inspection angle steel on the inner side of the corbel close to the steel lining wall plate and on the outer side of the corbel close to the center of the reactor, so that the two ends of the inspection angle steel are aligned with the inner side of the corbel for inspection, and the two measuring reflectors of the inspection angle steel are aligned with the outer side of the corbel for inspection.

[0023] When checking that the angle steel is placed on the outside of the corbel, measure the coordinates of the two reflective sheets, obtain the first axis by the line connecting the midpoint of the coordinate average of the two reflective sheets and the center of the reactor building, and measure the elevation of the upper surface of the outer side of the corbel; when checking that the angle steel is placed on the inner side of the corbel, measure the coordinates of the two reflective sheets, obtain the second axis by the line connecting the midpoint of the coordinate average of the two reflective sheets and the center of the reactor building, and measure the elevation of the upper surface of the inner side of the corbel; compare the deviation values ​​of the first axis and the second axis from the standard value, and the deviation values ​​of the elevation of the upper surface of the outer side of the corbel and the elevation of the upper surface of the inner side of the corbel from the standard value, and make corresponding adjustments if they do not meet the requirements. Fix them after they meet the requirements.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention solves the difficult problems of corbel installation positioning inspection, especially the problem of high requirements for corbel installation elevation and flatness. The upper surface elevation is measured by inspection tooling, thereby ensuring the horizontal accuracy of the upper surface. In addition, the mounting and stationing are flexible, the measurement is fast, the reference tooling is uniform, the inspection tool is easy to use, and the measurement accuracy is high.

[0026] Specifically, the method for installing, positioning, and checking the ring-hanging corbel of the present invention has the following advantages:

[0027] 1. Convenient measurement. The instrument can be set up according to the construction sequence, or multiple groups can work simultaneously according to needs to complete the entire installation positioning inspection work, which is conducive to ensuring the uniformity of measurement and avoiding the problems of the center frame of the positioning inspection total station being set up and occupying the working surface during construction, and the center frame being too high to affect the accuracy.

[0028] 2. High measurement accuracy. The use of forced centering base and inspection angle steel can greatly improve the measurement accuracy. By measuring the coordinates of the reflective sheet on the inspection angle steel, the coordinates of the center axis can be calculated, and the overall position of the corbel can be accurately determined.

[0029] 3. Simple structure and easy processing. The inspection tool is composed of angle steel and reflective sheet, which can be processed quickly and the reference point base can be reused.

[0030] The invention has been tested on site, and the quality is reliably guaranteed. The construction is convenient, flexible, and precise. It effectively ensures the accuracy of positioning inspection, optimizes the construction progress, and is flexible in erection. It does not occupy the space of other construction processes, helps to meet the needs of optimizing the construction progress, and effectively meets the quality requirements of on-site construction. Compared with the original method of erecting the center point detection, it greatly improves the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 : Corbel plan layout

[0032] Figure 2 : Elevation drawing of the first reference point at the gate

[0033] Figure 3 :Plan view of the first reference point at the gate

[0034] Figure 4 : Plane diagram of the second, third and fourth reference points of the corbel

[0035] Figure 5 : Elevation diagram of the second, third and fourth reference points of the corbel

[0036] Figure 6 : Check the structural diagram of the angle steel.

[0037] In the figure, 1. Corbel; 2. Containment steel lining; 3. Containment; 4. First datum point (equipment gate); 4-1. Channel steel; 4-2. Forced centering plate; 4-3. Centering plate connecting screw; 4-4. Connecting screw; 4-5. Nut; 4-6. Nut gasket; 4-7. Total station; 4-8. Support angle steel; 5. Third datum point, 6. Equipment gate; 7. Equipment gate platform; 8. Inspection angle steel; 8-1. ∠30×3 angle steel; 8-2. Reflector; 9. Second datum point, 10. Fourth datum point. DETAILED DESCRIPTION

[0038] The above contents of the present invention are further described in detail below in the form of embodiments, but this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments. All technologies implemented based on the above contents of the present invention fall within the scope of the present invention.

[0039] A method for installing and positioning a ring-hanging corbel includes the following steps:

[0040] Set a first reference point 4 at the equipment gate 6, set up a total station 4-7 at the first reference point 4, locate the first corbel installation position opposite the first reference point 4; drill a hole at the first corbel installation position, hoist and install the first corbel, and check the position;

[0041] Measure the axis and upper surface elevation of the first corbel; if qualified, set the upper surface of the first corbel as the second reference point, which serves as the plane and elevation reference point; use the total station 4-7 at the first reference point 4 to determine the coordinates of the second reference point 9, measure the vertical angle and distance, and calculate the elevation of the elevation reference point;

[0042] Set up the total station 4-7 at the second reference point, look back at the first reference point 4, and locate the second corbel installation position that is one-third of the distance from the second reference point 9 to the ring hanging circle; drill a hole at the second corbel installation position, hoist and install the second corbel, and check the position, measure the axis and upper surface elevation of the second corbel, and after passing the test, set the upper surface of the second corbel as the third reference point 5, measure the coordinates of the third reference point 5 using the total station 4-7 at the second reference point, and measure the elevation of the third reference point 5;

[0043] Set up the total station 4-7 at the third reference point 5, look back at the second reference point 9, locate the third corbel installation position which is one third of the distance from the second reference point to the circumference of the ring hanger, drill a hole at the third corbel installation position, hoist and install the third corbel, and check the position, measure the axis of the third corbel and the elevation of the upper surface, and after passing the test, set the upper surface of the third corbel as the fourth reference point 10, determine the coordinates of the fourth reference point 10 by the total station 4-7 at the third reference point 5, and measure the elevation of the fourth reference point 10; wherein, the fourth reference point 10 can also be positioned by the second reference point 9.

[0044] The second reference point 9, the third reference point 5 and the fourth reference point 10 are measured and checked for distance. After passing the test, the first to fourth reference points are used to locate the installation positions of the remaining corbels respectively.

[0045] A plane reference point tooling is set at each reference point; the plane reference point tooling of the first reference point 4 is supported horizontally by a channel steel 4-1 as a mobile base, with supporting angle steels 4-8 on both sides, a forced centering plate 4-2 set on the upper surface, a centering hole set in the center of the forced centering plate 4-2, and the centering hole is used to install the lower bolts of the total station 4-7; a fixed steel bar is set at the bottom of the channel steel 4-1; the fixed steel bar is threadedly connected to the forced centering plate 4-2, and the bottom is connected and fixed to the channel steel 4-1 by nuts 4-5 and washers. The plane reference point tooling of the second, third and fourth reference points is composed of a forced centering base, a forced centering plate 4-2 is set on the top of the forced centering base, a centering hole is set in the center, and the centering hole is used to install the lower bolts of the total station 4-7; three fixed steel bars are set at the bottom of the forced centering base; the fixed steel bar is threadedly connected to the forced centering base, and the lower part is spot welded to the surface of the bracket.

[0046] Select two common reference points inside and outside the circumference of the ring hanger as check points. The common reference points are known control points. Use the total station 4-7 at the first reference point 4 to look back at the first common reference point, measure the distance and direction angle, aim at the second common reference point, measure the distance and azimuth, calculate the coordinates of the first reference point 4, input the calculated coordinate values, re-aim at the second common reference point, set the azimuth angle, and set the elevation value.

[0047] By locating the center of the reactor building and setting the azimuth line, a coordinate system is established to determine the azimuth of the bracket in the reactor building. The X-axis is the 0°-180° axis of the coordinate system plane, the Y-axis is the 270°-90° axis of the coordinate system plane, and the Z-axis is the center axis of the reactor.

[0048] When the hole is opened at the installation position of the corbel, the measurement coordinates of the upper point on the wall where the corbel is designed to be installed are (X, Y, H), and the calculation is:

[0049] R=(X-X0)COSα+(Y-Y0)SINα

[0050] T=-(X-X0)SINα+(Y-Y0)COSα

[0051] Where (X0, Y0) is the coordinate of the center of the reactor building; α is the azimuth angle of the bracket in the reactor building; R is the distance from the wall where the bracket is designed to be installed to the center of the reactor building; and T is the azimuth deviation value.

[0052] If the T value is greater than the accuracy threshold, move the bracket installation position in the opposite direction of the deviation value, re-measure the coordinates and calculate the deviation value. If it meets the requirements, mark it as the upper point.

[0053] Use the same method to measure the coordinates of the lower point on the wall where the corbel is designed to be installed, mark the lower point, connect the upper point and the lower point, measure the elevation lines on the left and right of the connecting line, mark the connecting line, and drill a hole according to the size of the corbel; hoist and install the corbel.

[0054] The inspection angle steel 8 is used as an inspection tool, and the length of the inspection angle steel 8 is the width of the contact point between the inner side of the corbel and the steel lining plate; two measuring reflectors 8-2 are set on the side of the inspection angle steel 8, and the length of the measuring reflector 8-2 is the width of the outer side of the corbel. The two measuring reflectors 8-2 are symmetrically distributed around the center of the inspection angle steel 8, and the bottom of the measuring reflector 8-2 is flush with the bottom of the inspection angle steel 8; during inspection, the inspection angle steel 8 is placed on the inner side of the corbel close to the steel lining wall plate and the outer side of the corbel close to the center of the reactor, so that the two ends of the inspection angle steel 8 are aligned with the inner side of the corbel for inspection, and the two measuring reflectors 8-2 of the inspection angle steel 8 are aligned with the outer side of the corbel for inspection.

[0055] When checking that the angle steel 8 is placed on the outside of the corbel, measure the coordinates of the two reflective sheets 8-2, obtain the first axis by the line connecting the midpoint of the coordinate average of the two reflective sheets 8-2 and the center of the reactor building, and measure the elevation of the upper surface of the outer side of the corbel; when checking that the angle steel 8 is placed on the inner side of the corbel, measure the coordinates of the two reflective sheets 8-2, obtain the second axis by the line connecting the midpoint of the coordinate average of the two reflective sheets 8-2 and the center of the reactor building, and measure the elevation of the upper surface of the inner side of the corbel; compare the deviation values ​​of the first axis and the second axis from the standard value, and the deviation values ​​of the elevation of the upper surface of the outer side of the corbel and the elevation of the upper surface of the inner side of the corbel from the standard value, and make corresponding adjustments if they do not meet the requirements. Fix them after they meet the requirements.

[0056] The present invention is further described in detail below with reference to specific embodiments:

[0057] The coordinate measurements in the embodiments all use total stations 4-7, and the elevation measurements in the embodiments all use precision levels.

[0058] The steel lining of a nuclear power plant has a radius of R23.4m and a circumference of 147064mm. It has a total of 45 brackets, each weighing 4.5t. The brackets are evenly distributed at an elevation of +37.82m on the steel lining wall, and are evenly distributed at intervals of 3.268m (8°) along the steel lining wall. The width of the bracket at the contact point with the steel lining is 950mm, and 565mm on the other side. The center elevation of equipment gate 6 is +20.800m. The positioning inspection process is as follows:

[0059] 1. Set the first reference point 4 at the equipment gate 6. The first reference point 4 is set at the equipment gate 6 and is supported horizontally by a No. 8 channel steel 4-1 as a mobile base. ∠50×5 support angle steels 4-8 are installed on both sides. A forced centering plate 4-2 is set on the upper surface. The centering plate is made of a 20mmΦ200 stainless steel circular plate with a centering hole in the center. Three supporting and fixing Φ16 steel bars are set at the bottom. The steel bars are connected with M14 threads and M14 screw holes in the centering plate. The bottom is connected and fixed to the channel steel 4-1 with nuts 4-5 and washers.

[0060] 2. Locate the reference point opposite the bracket 1. Set up the total station 4-7 at the first reference point 4, look back at the first common reference point, measure the distance and azimuth, look back at a known point RXA (7007.0604, 2987.5401), measure the coordinates and distance 16.8326m, azimuth 12°13'26.2", rotate clockwise to aim at the second common reference point, measure the distance and azimuth, and measure the position of another known point RXB (6990.6224, 2991.3722 ) coordinates and distance 14.6395m, azimuth 76°38'55.5"; calculate the measurement site coordinates RXJ1 (6993.8603, 2977.0953) based on the measured values; calculate the coordinates of the first datum point 4, enter the calculated coordinates, re-aim at the second common datum point, set the azimuth 102°46'41.2", and set the elevation value; measure the upper coordinates of the corbel position (7005.8987, 3022.6754, 38.6505), and calculate:

[0061] R=(7005.8987-7000)COS75.5°+(3022.6754-3000)SIN75.5°=23.4301m

[0062] T=-(7005.8987-7000)SIN75.5°+(3022.6754-3000)COS75.5°=-0.0333m

[0063] (X0, Y0) The coordinates of the center of the reactor building are (7000, 3000), and the azimuth angle α of the bracket in the reactor building is 75.5°;

[0064] The T value is -0.0333m, which is greater than the accuracy requirement. The deviation value in the clockwise direction is 0.0333m. The measured coordinates are (7005.8684, 3002.6851, 38.6515).

[0065] Calculate the deviation value

[0066] R=(7005.8684-7000)COS75.5°+(3022.6851-3000)SIN75.5°=23.4319m

[0067] T=-(7005.8684-7000)SIN75.5°+(3022.6851-3000)COS75.5°=-0.0016m

[0068] Meet the requirements and mark the points;

[0069] Measure the lower point according to the above steps. The coordinates are (7005.8652, 3022.6841, 36.8451). Calculate the deviation value R = (7005.8652-7000)COS75.5° + (3022.6841-3000)SIN75.5° = 23.4301m

[0070] T=-(7005.8652-7000)SIN75.5°+(3022.6841-3000)COS75.5°=0.0013m

[0071] Meet the requirements and mark the points;

[0072] Mark the connection points; measure the elevation lines on the left and right of the connection line, mark the connection line, and drill holes according to the size of the corbel; hoist and install the corbel;

[0073] 3. Position inspection, measure the axis of the bracket and the elevation of the upper surface; align the left and right reflective sheets 8-2 of the inspection tool with the left and right edges of the bracket, and measure the coordinates of the reflective sheet 8-2. The inspection tool is the inspection angle steel 8, the angle steel model is ∠30×3, and the length is 950mm, the width of the contact point between the inner side of the bracket and the steel lining plate; set two measuring reflective sheets 8-2 on the side of the angle steel, and set one on the top of the outer width of the bracket, located 282.5mm on both sides of the center, and the bottom of the reflective sheet 8-2 is flush with the bottom of the angle steel; measure the coordinates of the two reflective sheets 8-2 at the center of the bracket near the reactor

[0074] (7005.8405, 3021.4509, 37.8205),

[0075] (7005.2936, 3021.5928, 37.8231),

[0076] Converted coordinates

[0077] (22.2300, -0.2836, 37.8205)

[0078] (22.2304, 0.2814, 37.8231)

[0079] Corbel axis = (-0.2836 + 0.2814) / 2 = -0.0011

[0080] Measure the 8-2 coordinates of the two reflective sheets where the corbel is against the steel lining wall panel.

[0081] (7006.1302, 3022.5833, 37.8232)

[0082] (7005.5825, 3022.7211, 37.8235)

[0083] Converted coordinates

[0084] (23.3988, -0.2805, 37.8232)

[0085] (23.3951, 0.2842, 37.8235)

[0086] Corbel axis = (-0.2805 + 0.2842) / 2 = 0.0018m

[0087] Axis deviation -0.0011, 0.0018 meets the requirements

[0088] Elevation deviation: MAX(37.8205, 37.8231, 37.8232, 37.8235)-MIN(37.8205, 37.8231, 37.8232, 37.8235) = 0.0030m

[0089] Meet the requirements

[0090] Welding and fixing after meeting the requirements

[0091] 4. After passing the test, weld and fix the corbel, set the second plane reference point 9 tooling and elevation reference point on the upper surface of the corbel. The reference point is set at the observation stand on the outside of the upper surface of the corbel. A forced centering plate 4-2 is set on the upper surface. The centering plate is made of a 20mmΦ200 stainless steel circular plate with a centering hole in the center. Three Φ16 supporting and fixing steel bars are set at the bottom. The steel bars are connected to the centering plate with M14 threads and spot welded to the surface of the corbel. Determine the plane coordinates of the second reference point 5 RXJ2 (7005.4168, 3021.6741); use the total station 4-7 to measure the vertical angle of 21°49ˊ38.8″ and the distance of 46.0523, and calculate the elevation of the elevation reference point 46.0523tg(21°49ˊ38.8″)+19.7298-0.2031=37.9719m

[0092] The instrument elevation is 19.7298m, and the prism height is 0.2031m;

[0093] Fifth, set up the total station 4-7 on the second datum point 9 on the corbel plane, look back at the first datum point 4, set the azimuth angle to 255°28ˊ00.1″, locate the corbel one-third of the circumference from the second datum point 5, drill the hole, hoist and install, check the position, and measure the corbel axis and upper surface elevation using the same method as step 2;

[0094] 6. After passing the test, set the third reference point 5 tooling on the corbel, and use a precision level to measure the elevation reference point; determine the plane coordinates of the third reference tooling RXJ3 (7016.0510, 2984.5035, 37.9705); locate another corbel that is one-third of the circumference away from the reference point, drill a hole, hoist and install, check the position, and measure the corbel axis and upper surface elevation using the same method as step 2;

[0095] 7. After passing the test, set the fourth reference point 10 tooling on the bracket, use a precision level to measure the elevation reference point, and determine the plane coordinates of the fourth reference tooling RXJ4 (6978.5542, 2993.8476, 37.9711), using the same method as step 2;

[0096] 8. Distance Verification of the Second, Third, and Fourth Reference Points

[0097] RXJ2-RXJ3 theoretical = 38.6619m, RXJ2-RXJ3 actual = 38.6632m, deviation 38.6619-38.6632=-0.0013m RXJ2-RXJ4 theoretical = 38.6670m, RXJ2-RXJ4 actual = 38.6659m, deviation 38.6670-38.6659=0.0011m RXJ3-RXJ4 theoretical = 38.6435m; RXJ3-RXJ4 actual = 38.6442m, deviation 38.6435-38.6442=-0.0007m. The deviations are all less than 2mm, meeting the accuracy requirements;

[0098] 9. After passing the test, locate the other corbels on the second, third and fourth reference points respectively, drill holes, hoist and install, check the positions, and measure the corbel axis and upper surface elevation until they pass the test. The method is the same as step 5.

[0099] The present invention has high measurement accuracy. It adopts a forced centering base, and the instrument installation point accuracy is improved from 1mm to 0.3mm. By adopting an inspection tool, the accuracy can reach 0.5mm. The coordinates of the center axis can be calculated by measuring the coordinates, and the overall position of the corbel can be accurately determined.

[0100] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any simple modification, equivalent replacement and improvement made by any technician familiar with the profession to the above embodiment without departing from the scope of the technical solution of the present invention and based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A method for checking the installation and positioning of a ring-hanging corbel, characterized in that: The following steps are involved: Set the first reference point at the equipment gate, set up a total station at the first reference point, and locate the first corbel installation position opposite the first reference point; drill a hole at the first corbel installation position, hoist and install the first corbel, and check its position; Measure the axis and upper surface elevation of the first corbel; if qualified, set the upper surface of the first corbel as the second reference point, which serves as the plane and elevation reference point; determine the coordinates of the second reference point using the total station at the first reference point, measure the vertical angle and distance, and calculate the elevation of the elevation reference point; Set up the total station at the second reference point, look back at the first reference point, and locate the second corbel installation position that is one-third of the circumference of the ring hanging from the second reference point; drill a hole at the second corbel installation position, hoist and install the second corbel, and check the position; measure the axis and upper surface elevation of the second corbel; if qualified, set the upper surface of the second corbel as the third reference point; measure the coordinates of the third reference point using the total station at the second reference point, and measure the elevation of the third reference point; Set up the total station at the third reference point, look back at the second reference point, locate the third corbel installation position that is one-third of the circumference of the ring hanging from the second reference point, drill a hole at the third corbel installation position, hoist and install the third corbel, and check the position. Measure the axis and upper surface elevation of the third corbel. If qualified, set the upper surface of the third corbel as the fourth reference point. Use the total station at the third reference point to determine the coordinates of the fourth reference point and measure the elevation of the fourth reference point. Measure and check the distances of the second, third and fourth reference points. If qualified, use the first to fourth reference points to locate the installation positions of the remaining brackets respectively; A plane reference point tooling is set up at each reference point; the plane reference point tooling of the first reference point is supported horizontally by channel steel as a mobile base, with supporting angle steels on both sides, a forced centering plate set on the upper surface, a centering hole set in the center of the forced centering plate, and the centering hole is used to install the lower bolts of the total station; fixed steel bars are set at the bottom of the channel steel; the fixed steel bars are threadedly connected to the forced centering plate, and the bottom is fixed to the channel steel by nuts and gaskets. The plane reference point tooling of the second, third and fourth reference points is composed of a forced centering base, a forced centering plate is set on the top of the forced centering base, a centering hole is set in the center, and the centering hole is used to install the lower bolts of the total station; three fixed steel bars are set at the bottom of the forced centering base; the fixed steel bars are threadedly connected to the forced centering base, and the lower part is spot welded to the surface of the corbel.

2. The method for installing, positioning, and checking a ring-hanging corbel according to claim 1, wherein: Select two common reference points inside and outside the circumference of the ring hanger as check points. The common reference points are known control points. Use the total station at the first reference point to look back at the first common reference point, measure the distance and direction angle, aim at the second common reference point, measure the distance and azimuth, calculate the coordinates of the first reference point, input the calculated coordinate values, re-aim at the second common reference point, set the azimuth angle, and set the elevation value.

3. The method for installing, positioning, and checking a ring-hanging corbel according to claim 1, wherein: By locating the center of the reactor building and setting the azimuth line, a coordinate system is established to determine the azimuth of the bracket in the reactor building. The X-axis is the 0º-180º direction axis of the coordinate system plane, the Y-axis is the 270º-90º direction axis of the coordinate system plane, and the Z-axis is the center axis of the reactor.

4. The method for installing, positioning, and checking a ring-hanging corbel according to claim 3, wherein: When the hole is opened at the installation position of the corbel, the measurement coordinates of the upper point on the wall where the corbel is designed to be installed are (X, Y, H), and the calculation is: R=(X-X0)COSα+(Y-Y0)SINα T=-(X-X0)SINα+(Y-Y0)COSα Wherein, (X0, Y0) is the coordinate of the center of the reactor building; α is the azimuth angle of the bracket in the reactor building; R is the distance from the wall where the bracket is designed to be installed to the center of the reactor building; T is the azimuth deviation value; If the T value is greater than the accuracy threshold, move the bracket installation position in the opposite direction of the deviation value, re-measure the coordinates and calculate the deviation value. If it meets the requirements, mark it as the upper point.

5. The method for installing, positioning, and checking a ring-hanging corbel according to claim 4, wherein: Use the same method to measure the coordinates of the lower point on the wall where the corbel is designed to be installed, mark the lower point, connect the upper point and the lower point, measure the elevation lines on the left and right of the connecting line, mark the connecting line, and drill a hole according to the size of the corbel; hoist and install the corbel.

6. The method for installing, positioning, and checking a ring-hanging corbel according to claim 1, wherein: Use the inspection angle steel as the inspection tool, and the length of the inspection angle steel is the width of the contact point between the inner side of the corbel and the steel lining plate; set two measuring reflectors on the side of the inspection angle steel, and the length of the measuring reflector is the width of the outer side of the corbel. The two measuring reflectors are symmetrically distributed around the center of the inspection angle steel, and the bottom of the measuring reflector is flush with the bottom of the inspection angle steel; during inspection, place the inspection angle steel on the inner side of the corbel close to the steel lining wall plate and on the outer side of the corbel close to the center of the reactor, so that the two ends of the inspection angle steel are aligned with the inner side of the corbel for inspection, and the two measuring reflectors of the inspection angle steel are aligned with the outer side of the corbel for inspection.

7. The method for installing, positioning, and checking a ring-hanging corbel according to claim 6, wherein: When checking that the angle steel is placed on the outside of the corbel, measure the coordinates of the two reflective sheets, obtain the first axis by the line connecting the midpoint of the coordinate average of the two reflective sheets and the center of the reactor building, and measure the elevation of the upper surface of the outer side of the corbel; when checking that the angle steel is placed on the inner side of the corbel, measure the coordinates of the two reflective sheets, obtain the second axis by the line connecting the midpoint of the coordinate average of the two reflective sheets and the center of the reactor building, and measure the elevation of the upper surface of the inner side of the corbel; compare the deviation values ​​of the first axis and the second axis from the standard value, and the deviation values ​​of the elevation of the upper surface of the outer side of the corbel and the elevation of the upper surface of the inner side of the corbel from the standard value, and make corresponding adjustments if they do not meet the requirements. Fix them after they meet the requirements.

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