Dimensional detection method for special-shaped steel tower segments

Abstract

The present invention relates to a method for detecting the dimensions of a steel tower segment with an irregular cross-section. The method develops a detection technology for a large-section thin-walled irregular steel tower segment. The cross-section of the steel tower segment is a irregular double-thin-wall structure, and the segment axis has a certain inclination angle. The "vertical" assembly technology is adopted, and the upper and lower end faces of the steel tower segment are associated through an adjustable steel tower segment measuring device, thereby realizing the "coaxial line method" for measuring the geometric dimensions of the upper and lower end faces of the steel tower segment, and achieving the purpose of accurately detecting the dimensions of the upper and lower end faces of the steel tower segment. The method can accurately measure the geometric dimensions of the steel tower segment at one time and improve work efficiency. The method has advanced technology, strong practicality, simple operation and high efficiency, and has been verified in practice to have good results.

Description

Technical Field

[0001] The present invention relates to a method for detecting the dimensions of special-shaped steel tower segments, which can meet the requirements for vertical production and detection of steel tower segments and can accurately detect the dimensions of the upper and lower end faces of the steel tower segments through the measurement methods of "upper and lower end face coaxial line method" and "positive and negative triangle method". Background Art

[0002] Bridge steel shell tower is a type of bridge cable tower structure that has appeared in recent years. Its manufacturing technology has gradually developed, but the technology for detecting the size of steel tower segments has lagged behind. Conventional detection methods can ensure the accuracy of structural dimensions for vertical steel tower segments, but for special-shaped steel tower segments, conventional tools such as steel rulers and plumb bobs can only detect the dimensions of the upper and lower end faces, and it is difficult to accurately guarantee the correlation between the upper and lower end faces. Therefore, conventional measurement methods cannot accurately measure the structural dimensions, and the measurement process is complicated and the work efficiency is low. At the same time, since the steel tower has an inclination angle, it is difficult to accurately measure the relationship between the upper and lower end faces of the steel tower segment using a high-precision total station. Therefore, it is necessary to combine the structural characteristics of special-shaped steel tower segments and urgently need to develop a size detection method suitable for special-shaped cross-section steel tower segments. Summary of the Invention

[0003] Design purpose: To avoid the shortcomings of the background technology, a method for detecting the dimensions of special-shaped steel tower segments is designed to meet the requirements of vertical production and inspection of steel tower segments, and to accurately detect the dimensions of the upper and lower end faces of the steel tower segments through the measurement methods of "upper and lower end face coaxial line method" and "positive and negative triangle method".

[0004] Design plan: The steel tower segment is a special-shaped double-thin-wall structure, and the segment axis has a certain inclination angle. A "vertical" assembly plan is adopted, and an end face dimension detection method is developed for the steel tower segment structure to meet the vertical production and detection requirements of the steel tower segment. An adjustable steel tower segment measuring device is developed, and the measurement techniques of "upper and lower end face coaxial line method" and "positive and negative triangle method" are used to achieve accurate detection of the upper and lower end face dimensions of the steel tower segment.

[0005] 1. Design an adjustable steel tower segment detection device to measure the upper end surfaces of steel tower segments of different heights.

[0006] ⑴ Design and manufacture the upper end surface measuring device of the steel tower segment, which consists of the measuring tower standard section, measuring tower top section, measuring reference piles, adjusting fasteners, etc.

[0007] ⑵ The standard section of the measuring tower of the upper end face measuring device is composed of a cover plate, a column, a horizontal connecting plate, and an oblique brace. The cover plate is used for connecting between standard sections and positioning columns. The columns serve as supporting connections between cover plates. The horizontal connecting plate is used to reinforce the cover plate. The oblique brace is used to reinforce the columns to prevent deformation of the standard section. Welding is adopted between various components. The top section of the measuring tower is composed of a cover plate, a column, a horizontal connecting plate, an oblique brace, and adjusting fasteners. The cover plate is used for connecting between standard sections and positioning columns. The columns serve as supporting connections between cover plates. The horizontal connecting plate is used to reinforce the cover plate. The oblique brace is used to reinforce the columns to prevent deformation of the standard section. The adjusting fastener is a screw-tightening structure used to adjust the height and positioning of the measuring reference column. Welding is adopted between the cover plate, columns, horizontal connecting plate, oblique brace, adjusting fasteners and other components.

[0008] ⑶ Bolts are used to connect the standard sections of the measuring tower and between the standard sections and the top section. The measuring reference pile and the top section are connected by screw jacking. The measuring reference column is a steel pipe structure of Φ200mm-Φ400mm, so that the intersection of the reference measurement can be observed through the steel pipe. The adjusting fastener is a screw jacking structure, which is used to adjust the height and positioning of the measuring reference column. The measuring reference pile and the adjusting fastener are connected by jacking.

[0009] 2. The core technology of the "coaxial line method" for detecting the dimensions of special-shaped steel tower segments is to convert the measurement points at the same position on the upper and lower end faces of the steel tower segment with an inclination angle into a method for dimensional detection using the same measurement method.

[0010] ⑴ Before the steel tower segment is assembled and welded, a measurement reference line of the lower end face is marked on the assembly platform. The measurement reference line is 50mm to 200mm away from the outer contour line of the steel tower segment. Sample punching holes need to be set at the vertical baseline of the steel tower segment block and the block joint.

[0011] ⑵ Since the axis of the steel tower segment has an inclination, the intersection of the longitudinal baseline and the transverse baseline of the lower end face of the steel tower segment needs to be used as the reference point. The intersection of the longitudinal baseline and the transverse baseline of the upper end face of the steel tower segment is determined by computer space coordinate layout, and the intersection is clearly marked and punched.

[0012] ⑶ Use the intersection of the longitudinal baseline and the horizontal baseline of the upper end face of the steel tower segment on the assembly platform as the reference to locate the standard section of the measuring tower. The deviation between the geometric center of the standard section of the measuring tower and the intersection of the baselines is required to be ≤2mm. Then connect the standard section of the measuring tower to the assembly platform with bolts.

[0013] (4) Connect the standard section of the measuring tower to the top section, and accurately adjust the position of the measuring reference pile to ensure that the projection deviation of the intersection of the measuring point on the measuring reference pile and the upper end face longitudinal baseline and horizontal baseline on the assembly platform is ≤0.5mm.

[0014] ⑸ Calculate the distance from the intersection of the upper end face longitudinal baseline and horizontal baseline to the vertical baseline of each block and the block joint through computer layout.

[0015] (6) The lower end face dimension of the steel tower segment is detected by using a steel ruler and a square to measure the distance from the vertical baseline of each block and the measurement baseline at the joint to the actual outer contour of the steel tower.

[0016] ⑺ The upper end face size inspection of the steel tower segment is to measure the distance from the vertical baseline of each block and the measurement baseline at the joint to the actual outer contour of the steel tower by using a steel tape measure and a spring scale.

[0017] ⑻ At the same time, the diagonal lines and the maximum outer contours of length and width of the characteristic points of the steel tower segment are detected.

[0018] ⑼ Compare the test results with the theoretical data. If the deviation between the measured data and the theoretical data is ≤5mm, it is qualified. If the deviation is greater than 5mm, it needs to be adjusted.

[0019] Compared with the background technology, the present invention can, firstly, accurately measure the manufacturing accuracy of steel tower segments at one time, solving the problem of manufacturing dimension detection of new special-shaped steel tower segments, thereby ensuring the manufacturing accuracy and quality of steel tower segments; secondly, the present invention is technologically advanced, highly practical, simple to operate and highly efficient, and has been verified in practice to have good results. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an overall schematic diagram of the steel tower segment inspection. 1-1 represents the assembly welding platform, 1-2 represents the steel tower segment, and 1-3 represents the measurement tower.

[0021] Figure 2 This is a schematic diagram of a steel tower segment inspection tower. 2-1 represents the standard section of the measurement tower, and 2-2 represents the top section of the measurement tower.

[0022] Figure 3 This is a schematic diagram of the standard section and top section of the measuring tower. 3-1 represents the cover plate, 3-2 represents the column, 3-3 represents the diagonal brace, 3-4 represents the horizontal connecting plate, 3-5 represents the adjusting fastener, and 3-6 represents the measuring pile.

[0023] Figure 4 This is a schematic diagram of the measurement of the lower end face of the steel tower segment. 4-1 represents the horizontal baseline of the upper and lower end faces, 4-2 represents the vertical baseline of the lower end face, 4-3 represents the vertical baseline of the upper end face, 4-4 represents the outer contour position line of the lower end face of the steel tower segment, and 4-5 represents the outer contour dimension detection baseline of the lower end face of the steel tower segment.

[0024] Figure 5 This is a schematic diagram of the measurement of the upper end face of the steel tower segment. 5-1 represents the outer contour position line of the upper end face of the steel tower segment, and 5-2 represents the outer contour position line of the lower end face of the steel tower segment.

[0025] Figure 6 It is a schematic diagram of the diagonal line of the steel tower segment end face inspection. Implementation Method

[0026] Example 1: Refer to the attached Figure 1-6 A method for detecting the size of special-shaped steel tower segments:

[0027] Step 1: Make the standard section and top section of the steel tower measuring tower, assemble and weld the cover plate 3-1, column 3-2, diagonal brace 3-3, horizontal connecting plate 3-4, adjusting fastener 3-5, and measuring pile 3-6 into a whole to form the tower standard section 2-1 and the measuring tower top section 2-2.

[0028] Step 2: Reference Figure 4 On the assembly welding platform 1-1, mark the horizontal baseline 4-1 of the upper and lower end faces of the steel tower segment, the vertical baselines 4-2 and 4-3 of the upper and lower end faces, the outer contour position line 4-4 of the lower end face of the steel tower segment, and the outer contour dimension detection baseline 4-5 of the lower end face of the steel tower segment.

[0029] Step 3: Reference Figure 2 The standard section 2-1 of the measuring tower is positioned based on the horizontal baseline 4-1 and the vertical baseline 4-3 of the upper end face of the steel tower segment. The deviation between the geometric center of the standard section of the measuring tower and the intersection of the baselines is required to be ≤2mm.

[0030] Step 4: Reference Figure 2 , install the measuring tower top section 2-2 on the standard section 2-1, accurately adjust the position of the measuring reference pile, and ensure that the projection deviation of the intersection of the measuring point on the measuring reference pile and the upper end face longitudinal baseline and horizontal baseline on the assembly platform is ≤0.5mm, and the height deviation is ≤5mm.

[0031] Step 5: Reference Figure 4 The distance from the intersection point o to each measuring point (1, 2...8) is measured with the intersection of the horizontal baseline 4-1 and the vertical baseline 4-2 of the lower end face of the steel tower segment as the reference. Since it is affected by the inner wall of the steel tower and cannot be measured, a steel ruler and a square are used to measure the distance from each measuring point to the outer contour position line 4-4 of the lower end face of the steel tower segment.

[0032] Step 5: Reference Figure 5 Taking the measuring point on the measuring reference pile as the reference, a steel tape measure is used in conjunction with a spring scale to measure the distance from the intersection o' to each measuring point (1'2'...8') to complete the side detection of the characteristic points on the upper end face.

[0033] Step 6: Reference Figure 6 For steel towers with special-shaped end faces, "two positive and negative triangles" are used to detect the diagonals of the end faces of the steel tower segments to accurately measure the geometric dimensions of the steel tower segments.

[0034] Step 7: Compare the test data of the upper and lower end faces of the steel tower segment with the theoretical data. If the deviation between the measured data and the theoretical data is ≤5mm, it is qualified. If the deviation is greater than 5mm, the steel tower segment needs to be trimmed.

[0035] It should be understood that although the above embodiments provide a relatively detailed textual description of the design ideas of the present invention, these textual descriptions are only simple textual descriptions of the design ideas of the present invention, rather than limitations on the design ideas of the present invention. Any combination, addition or modification that does not exceed the design ideas of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A method for detecting the size of a special-shaped steel tower segment, characterized by: (1) Before the vertical assembly and welding of the steel tower segment, mark the measurement reference line of the lower end face on the assembly platform. The measurement reference line is 50mm to 200mm away from the outer contour line of the steel tower segment. Sample punching holes need to be set on the vertical baseline of the steel tower segment block and the block joint. The sample punching holes of each block are set on the outer contour line; (2) As the axis of the steel tower segment has an inclination, the intersection of the longitudinal baseline and the transverse baseline of the lower end face of the steel tower segment is required to be used as the reference point. The intersection of the longitudinal baseline and the transverse baseline of the upper end face of the steel tower segment is determined by computer space coordinate layout, and the intersection is clearly marked and punched; (3) Using the intersection of the longitudinal baseline and the transverse baseline of the upper end face of the steel tower segment on the assembly platform as the reference, locate the standard section of the measurement tower. The deviation between the geometric center of the standard section of the measurement tower and the intersection of the baselines should be ≤2mm. Then, connect the standard section of the measurement tower to the assembly platform with bolts. (4) Connect the standard section of the measuring tower to the top section, and accurately adjust the position of the measuring reference pile to ensure that the projection deviation of the measuring point on the measuring reference pile on the top section and the intersection of the upper end face longitudinal baseline and transverse baseline on the assembly platform is ≤0.5mm; (5) Calculate the distance from the intersection of the upper end face longitudinal baseline and the horizontal baseline to the vertical baseline of each block and the block joint by computer layout; (6) The dimension inspection of the lower end face of the steel tower segment is carried out by measuring the intersection of the horizontal baseline and the vertical baseline of the lower end face of the steel tower segment with a steel ruler and a square, and the distance from the intersection to the sample punching holes of each block on the outer contour line of the lower end face of the steel tower segment; ⑺ The upper end face dimension inspection of the steel tower segment is based on the measuring point on the measuring reference pile. A steel tape measure is used in conjunction with a spring scale to measure the distance from the reference to the sample punching holes of each block on the outer contour line of the upper end face of the steel tower segment. ⑻ For special-shaped cross-section steel towers, two positive and negative triangles are used to detect the diagonal lines of the end faces of the steel tower segments to accurately measure the geometric dimensions of the steel tower segments; ⑼ Compare the test results with the theoretical data. If the deviation between the measured data and the theoretical data is ≤5mm, it is qualified. If the deviation is greater than 5mm, it needs to be adjusted.

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