Measurement Method for Straightness of Ground Welding of Bimetallic Composite Wear-Resistant Pipe

Abstract

The invention discloses a method for measuring the flatness of the ground welding of a bimetal composite wear-resistant pipe, which includes the following operations: 1) Using a lifting device to pre-align two bimetal composite wear-resistant pipes on a ground welding platform, setting no less than 2 marking points on each bimetal composite wear-resistant pipe respectively, and determining the position of the measurement base point; 2) Measuring the flatness of the ground welding of the bimetal composite wear-resistant pipe in the vertical direction; 3) Measuring the flatness of the ground welding of the bimetal composite wear-resistant pipe in the horizontal direction. By setting the marking points at the highest point of the outer diameter of the bimetal composite wear-resistant pipe, the method of the invention can reduce the error of the subsequent flatness calculation, improve the measurement accuracy, and is convenient for operation.

Description

Technical Field

[0001] The invention belongs to the technical field of measuring the straightness of wear-resistant pipes in waste rock dropping wells, and particularly relates to a method for measuring the straightness of ground welding of bimetallic composite wear-resistant pipes. Background Technique

[0002] In the solid filling coal mining technology, a waste rock dropping well refers to a vertical borehole dug on the ground to the underground, and a bimetallic composite wear-resistant pipe is installed as a conveying channel for waste rock materials. Solid wastes such as waste rock fall through the waste rock dropping well to the underground waste rock storage bin. Therefore, the dropping well is the key project of the solid filling coal mining transportation system, which determines the stability of waste rock feeding. In the current engineering practice of solid filling coal mining technology, the depth of the waste rock dropping well ranges from 100 to 700 m. As a conveying channel for waste rock, due to the limitation of its manufacturing process, the length of a single bimetallic composite wear-resistant pipe is generally about 7 m. Therefore, in order to improve the installation efficiency of bimetallic composite wear-resistant pipes, single bimetallic composite wear-resistant pipes are welded together on the ground, and the welded bimetallic composite wear-resistant pipes are lowered to the upper part of the feeding wellhead by using large lifting equipment, and then vertically welded with the bimetallic composite wear-resistant pipes under the feeding wellhead.

[0003] During the process of waste rock falling in the dropping well, if the straightness of the bimetallic composite wear-resistant pipe has a large deviation, the waste rock particles will collide and rub against the pipe wall of the bimetallic composite wear-resistant pipe frequently, resulting in serious wear of the bimetallic composite wear-resistant pipe until it is penetrated, causing the collapse of the well wall of the dropping well. Therefore, the straightness of the bimetallic composite wear-resistant pipe directly determines the service life of the waste rock dropping well. For the current actual construction situation, the wear-resistant pipe straightness measurement method is usually applicable to single wear-resistant pipes with small diameters. For bimetallic composite wear-resistant pipes, due to their structural characteristics of large diameter and heavy weight, after the ground welding process, the existing measurement methods cannot effectively measure their straightness. Therefore, it is necessary to propose a method for measuring the straightness of ground welding of bimetallic composite wear-resistant pipes to solve the above problems. Summary of the Invention

[0004] The first object of the invention is to provide a method for measuring the straightness of ground welding of bimetallic composite wear-resistant pipes, which has the advantages of simplicity, easy operation and high measurement accuracy.

[0005] The technical solution adopted by the invention is that the method for measuring the straightness of ground welding of bimetallic composite wear-resistant pipes includes the following operations:

[0006] 1) Use lifting equipment to pre-align two bimetallic composite wear-resistant pipes on the ground welding platform, set no less than 2 marking points on each bimetallic composite wear-resistant pipe respectively, and determine the position of the measurement base point;

[0007] 2) Vertically place the leveling rod at each marking point in sequence. Set up a level at the measurement base point, and use the level in conjunction with the leveling rod to measure the leveling rod data corresponding to each marking point, and adjust the attitude of adjacent double-metal composite wear-resistant pipes in the vertical direction. Finally, measure the straightness of the ground welding of the double-metal composite wear-resistant pipes in the vertical direction;

[0008] 3) Place the spirit level at each marking point in sequence. After adjusting the spirit level to the horizontal state, place a reflecting prism above the spirit level; set up a total station at the measurement base point, use the total station to record the crosshair coordinates of the reflecting prisms of all marking points, and use the obtained crosshair coordinates of the reflecting prisms of the marking points to adjust the attitude of adjacent double-metal composite wear-resistant pipes in the horizontal direction. Finally, measure the straightness of the ground welding of the double-metal composite wear-resistant pipes in the horizontal direction.

[0009] The feature of the present invention also lies in that,

[0010] In step 1), select the highest point of the outer diameter of the cross-section of the double-metal composite wear-resistant pipe as the marking point.

[0011] In step 1), the distance between adjacent marking points on a single double-metal wear-resistant pipe is greater than half of the length of a single double-metal wear-resistant pipe.

[0012] In step 2), the specific method for adjusting the attitude of adjacent double-metal composite wear-resistant pipes in the vertical direction is: making the absolute value of the difference between the leveling rod data corresponding to any two marking points less than or equal to 0.2 mm.

[0013] In step 3), when adjusting the adjacent double-metal composite wear-resistant pipes in the horizontal direction, the following conditions must be met, that is:

[0014]

[0015] Where: (x m , y m ), (x n , y n ) are the crosshair coordinates of the reflecting prisms corresponding to any two marking points on one of the double-metal composite wear-resistant pipes after attitude adjustment; (x p , y p ), (x q , y q ) are the crosshair coordinates of the reflecting prisms corresponding to any two marking points on the other double-metal composite wear-resistant pipe after attitude adjustment.

[0016] The beneficial effect of the present invention is:

[0017] (1) The present invention discloses a method for measuring the flatness of the ground welding of a bimetallic composite wear-resistant pipe. By setting marking points on adjacent bimetallic composite wear-resistant pipes before ground welding respectively, and combining a leveling rod and a level to measure the marking points, the flatness in the vertical direction is measured, and the flatness in the horizontal direction is measured by combining a spirit level, a reflecting prism and a total station. The method for measuring the flatness of the ground welding of the bimetallic composite wear-resistant pipe according to the present method can effectively measure the flatness in the horizontal direction and the vertical direction of the bimetallic composite wear-resistant pipe with a large diameter and heavy weight before ground welding. This measuring method has strong versatility and wide applicable conditions, and can effectively control the flatness of the bimetallic composite wear-resistant pipe before ground welding under different site conditions.

[0018] (2) By setting the marking points at the highest point of the outer diameter of the bimetallic composite wear-resistant pipe, the method of the present invention can reduce the error of subsequent flatness calculation, improve the measurement accuracy, and is convenient for operation.

[0019] (3) By selecting no less than two marking points on each bimetallic composite wear-resistant pipe, the method of the present invention can quickly determine the flatness in the vertical direction through the elevation of the marking points, and can quickly determine the flatness in the horizontal direction through the coordinates of the marking points.

[0020] (4) The distance between adjacent marking points on each bimetallic wear-resistant pipe of the method of the present invention is greater than half of the length of a single bimetallic wear-resistant pipe, which improves the reliability of the elevation of the marking points and the coordinate data of the marking points. Description of the Drawings

[0021] Figure 1 is a schematic diagram of the use state when measuring the flatness in the vertical direction of the ground welding of the bimetallic composite wear-resistant pipe in the method of the present invention;

[0022] Figure 2 is a schematic diagram of the use state when measuring the flatness in the horizontal direction of the ground welding of the red bimetallic composite wear-resistant pipe in the present invention.

[0023] In the figure, 1. Bimetallic composite wear-resistant pipe a; 2. Leveling rod; 3. Bimetallic composite wear-resistant pipe b; 4. Welding platform; 5. Spirit level; 6. Reflecting prism; 7. Marking point; 8. Total station; 9. Measuring base point; 10. Level. Detailed Embodiment

[0024] The present invention will be described in detail below in conjunction with the drawings and specific embodiments.

[0025] The present invention provides a method for measuring the flatness of the ground welding of a bimetallic composite wear-resistant pipe, including the following operations:

[0026] 1) Use a lifting device to pre-align two bimetal composite wear-resistant pipes on a ground welding platform. Set no less than 2 marking points 7 on each bimetal composite wear-resistant pipe respectively, and determine the position of the measurement base point 9;

[0027] In step 1), select the highest point of the outer diameter of the cross-section of the bimetal composite wear-resistant pipe as the marking point 7.

[0028] In step 1), the distance between adjacent marking points 7 on a single bimetal wear-resistant pipe is greater than half of the length of the single bimetal wear-resistant pipe.

[0029] 2) Vertically place a leveling staff 11 on each marking point 7 in sequence. Set a level 10 at the measurement base point 9. Use the level 10 in cooperation with the leveling staff 2 to measure the leveling staff data corresponding to each marking point 7 respectively, and adjust the postures of the adjacent two bimetal composite wear-resistant pipes in the vertical direction. Finally, measure the straightness of the bimetal composite wear-resistant pipe in the vertical direction during ground welding;

[0030] In step 2), the specific method for adjusting the postures of the adjacent two bimetal composite wear-resistant pipes in the vertical direction is: make the absolute value of the difference between the leveling staff data corresponding to any two marking points (7) less than or equal to 0.2 mm.

[0031] 3) Place a spirit level 5 on each marking point 7 in sequence. After adjusting the spirit level 5 to a horizontal state, place a reflecting prism 6 above the spirit level 5; Set a total station 8 at the measurement base point 9. Use the total station 8 to record the crosshair coordinates of the reflecting prism 6 of all marking points 7. Use the obtained crosshair coordinates of the reflecting prism 6 of the marking 7 to adjust the postures of the adjacent two bimetal composite wear-resistant pipes in the horizontal direction. Finally, measure the straightness of the bimetal composite wear-resistant pipe in the horizontal direction during ground welding.

[0032] In step 3), the adjacent two bimetal composite wear-resistant pipes need to meet the following conditions in the horizontal direction, that is:

[0033]

[0034] Where: (x m , y m ), (x n , y n ) are the crosshair coordinates of the reflecting prism 6 corresponding to any two marking points 7 on one of the bimetal composite wear-resistant pipes after adjusting the posture; (x p , y p ), (x q , y q ) are the crosshair coordinates of the reflecting prism 6 corresponding to any two marking points 7 on the other bimetal composite wear-resistant pipe after adjusting the posture.

[0035] Example

[0036] See Figure 1-2 As shown, the measuring instrument for the flatness of the ground welding of the bimetal composite wear-resistant pipe of the present invention includes a level 10, a leveling staff 2, a total station 8, a reflecting prism 6, and a spirit level 5. The level 10 and the leveling staff 2 are used to measure the vertical flatness of the ground welding of the bimetal composite wear-resistant pipe; the total station 8, the reflecting prism 6, and the spirit level 5 are used to measure the horizontal flatness of the ground welding of the bimetal composite wear-resistant pipe; the bimetal composite wear-resistant pipe is a vertical material delivery pipe for connecting the ground and the underground in filling mining.

[0037] Step 1: Use a lifting device to pre-align the bimetal composite wear-resistant pipe a 1 and the bimetal composite wear-resistant pipe b 3 on the ground welding platform 4, and find a measurement reference point 9 around the welding platform 4;

[0038] Step 2: When two marking points are set on each metal composite wear-resistant pipe, namely the A marking point, the B marking point, and the C marking point, the D marking point, vertically place the leveling staff 2 at the A marking point on the bimetal composite wear-resistant pipe a 1, set the level 10 at the measurement reference point 9, record the data of the leveling staff 2 at the A marking point, repeat this operation, and measure the data of the leveling staff 2 at the B marking point, the C marking point, and the D marking point respectively. Then, according to the data of the leveling staff 2 at the A marking point, the B marking point, the C marking point, and the D marking point, adjust the postures of two adjacent bimetal composites in the vertical direction, and finally measure the vertical flatness of the ground welding of the bimetal composite wear-resistant pipe;

[0039] In step 2), the specific method for adjusting the postures of two adjacent bimetal composites in the vertical direction is: making the absolute value of the difference between the data of the leveling staff corresponding to any two of the A marking point, the B marking point, the C marking point, and the D marking point less than or equal to 0.2 mm.

[0040] Step 3: Place the spirit level 5 at the A marking point on the bimetal composite wear-resistant pipe a 1. When the spirit level 5 is horizontal, place the reflecting prism 6 above the spirit level 5, set the total station 8 at the measurement reference point 9, record the crosshair coordinates of the reflecting prism 6 above the A marking point, repeat this operation, and measure the crosshair coordinates of the reflecting prism 6 above the B marking point, the C marking point, and the D marking point respectively. Adjust the postures of two adjacent bimetal composite wear-resistant pipes in the horizontal direction, and finally measure the horizontal flatness of the ground welding of the bimetal composite wear-resistant pipe;

[0041] In step 3), the adjustment of two adjacent bimetal composites in the horizontal direction must meet the following conditions, that is:

[0042]

[0043] Where: (x m ,ym ), (x n , y n ) are the crosshair coordinates of the reflection prisms (6) corresponding to any two marked points (7) on the bimetallic composite wear-resistant pipe a; (x p , y p ), (x q , y q ) are the crosshair coordinates of the reflection prisms (6) corresponding to any two marked points (7) on the bimetallic composite wear-resistant pipe b.

[0044] Specifically, when two marked points are set on each metal composite wear-resistant pipe, namely the A marked point, the B marked point, and the C marked point, the D marked point, the above calculation formula (2) can be written as:

[0045]

[0046] In the formula: (x1, y1), (x2, y2) are the crosshair coordinates of the reflection prisms at two points of the marked points on the bimetallic composite wear-resistant pipe a, and (x3, y3), (x4, y4) are the crosshair coordinates of the reflection prisms at two points of the marked points on the bimetallic composite wear-resistant pipe b.

[0047] In summary, the measurement method of the present invention, including the flatness measurement in the horizontal direction and the flatness measurement in the vertical direction, can effectively measure the ground welding flatness of the bimetallic wear-resistant pipe of the gangue dropping shaft under different site conditions, enable engineering technicians to master the deviation state of the wear-resistant pipe, and thus timely adjust the flatness of the wear-resistant posture, improving the ground welding accuracy of the bimetallic composite wear-resistant pipe of the gangue dropping shaft.

Claims

1. A method for measuring the flatness of the ground welding of a bimetal composite wear-resistant pipe, characterized in that, Including the following operations: 1) Use a lifting device to pre-align two bimetal composite wear-resistant pipes on a ground welding platform. Set no less than 2 marking points (7) on each bimetal composite wear-resistant pipe respectively, and determine the position of the measurement reference point (9); In step 1), select the highest point of the outer diameter of the cross-section of the bimetal composite wear-resistant pipe as the marking point (7); In step 1), the distance between adjacent marking points (7) on a single bimetal wear-resistant pipe is greater than half of the length of the single bimetal wear-resistant pipe; 2) Vertically place a leveling staff (2) on each marking point (7) in sequence. Set a level (10) at the measurement reference point (9). Use the level (10) in cooperation with the leveling staff (2) to measure the leveling staff data corresponding to each marking point (7) respectively, and adjust the postures of the adjacent two bimetal composite wear-resistant pipes in the vertical direction. Finally, measure the straightness in the vertical direction of the ground welding of the bimetal composite wear-resistant pipes; 3) Place a spirit level (5) on each marking point (7) in sequence. After adjusting the spirit level (5) to a horizontal state, place a reflecting prism (6) above the spirit level (5); Set a total station (8) at the measurement reference point (9). Use the total station (8) to record the crosshair coordinates of the reflecting prism (6) of all marking points (7). Use the obtained crosshair coordinates of the reflecting prism (6) of the marking points (7) to adjust the postures of the adjacent two bimetal composite wear-resistant pipes in the horizontal direction. Finally, measure the straightness in the horizontal direction of the ground welding of the bimetal composite wear-resistant pipes.

2. The measuring method for the flatness of the ground welding of a bimetal composite wear-resistant pipe according to claim 1, characterized in that, In step 2), the specific method for adjusting the postures of the adjacent two bimetal composites in the vertical direction is: make the absolute value of the difference between the leveling staff data corresponding to any two marking points (7) less than or equal to 0.2 mm.

3. The method for measuring the flatness of the ground welding of the bimetal composite wear-resistant pipe according to claim 1, characterized in that, In step 3), the adjustment of the adjacent two bimetal composites in the horizontal direction must meet the following conditions, that is: In the formula: , are the cross cursor coordinates of the reflecting prisms (6) corresponding to any two marking points (7) on one of the bimetal composite wear-resistant pipes after attitude adjustment; , are the cross cursor coordinates of the reflecting prisms (6) corresponding to any two marking points (7) on the other bimetal composite wear-resistant pipe after attitude adjustment.

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