Segmented base installation precision control method in non-horizontal state

Abstract

The invention provides a method for controlling the installation precision of a segmented base in a non-horizontal state, which comprises the following steps of: marking a center line, a rib inspection line and a horizontal inspection line before a segmented blank is removed, making a horizontal mark in a cabin at the installation position of the base, and marking a punch; a virtual vertical face parallel to the center line of the base and a virtual plane parallel to the mounting face of the base are established on the subsection to serve as the benchmark, and positioning in the width direction and the length direction of the base, leveling of a base panel and determination of the allowance of a lower opening of the base are conducted respectively; three points selected when a virtual vertical face and a virtual plane are established preferentially select strong structure positions, the coverage range is larger than that of a base, and precision errors are avoided; in the process of determining the allowance of the lower opening of the base, welding shrinkage compensation needs to be considered in cutting of the allowance of the lower opening of the base, the allowance of the base is determined, control over the installation precision of the base is completed, and the influence of segmentation on the installation precision of the base in the non-horizontal state is eliminated.

Description

Technical Field

[0001] The invention belongs to the technical field of shipbuilding, and in particular relates to a method for controlling the installation accuracy of a segmented base in a non-horizontal state. Background Art

[0002] The installation of key foundations such as large main engines and equipment of various types of ships in the shipbuilding industry is usually installed in the tire during the completion stage of the segment in a horizontal state. Due to the tight tire position and the short construction period of the segment in the tire, the installation of large foundations on the engine room segment is often arranged in the period after the segment leaves the tire and before the ship is loaded on the slipway. Because the segment has been separated from the tire, the segment becomes uneven, and the traditional practice for the installation of the foundation is to first adjust the horizontal state of the segment to meet the requirements. The process of adjusting the horizontal state of the segment is complicated, and the steps are as follows: first adjust the longitudinal level of the bow and stern bottom plates to the right level, and then adjust the upper center line based on the center line of the bottom plate to make the alignment deviation meet ±2mm, and then re-measure the deck side plates at the front and rear end points (strong rib position) of the segment to make the deck four corners meet the standard requirements. Finally, set up the center line and base rib inspection line frame on the inner bottom plate, and set up a benchmark outside the segment as the basis for the base positioning. However, the segmentation status is easily affected by cross-operation, especially the lifting of heavy pallets, which makes the segmentation non-horizontal again. It is difficult to control the accuracy of the base, resulting in a large amount of man-hour loss in repeated adjustments of the segmentation status, and the overall efficiency is low. Summary of the invention

[0003] In order to solve the technical problems existing in the prior art, the present invention provides a method for controlling the installation accuracy of a segmented base in a non-horizontal state, which comprises the following steps:

[0004] Establish a vertical plane based on the center line of the cabin, which will be used as the width reference for the base installation;

[0005] Locate the datum centerline, measure the base centerline surface, adjust it to be parallel to the newly established surface and ensure that the base centerline distance dimension meets the tolerance requirements;

[0006] Then measure the base to check the rib position and adjust it to align with the corresponding rib position of the segment;

[0007] A virtual plane is established in the cabin based on the theoretical height of the base panel, and the plane is used as the height reference for the base installation;

[0008] First, adjust the base panel plane to be parallel to the virtual reference plane, measure the parallel data between the reference plane and the base plane, and perform margin trimming on the base according to the drawing data;

[0009] Survey and mark the margin of the bottom opening of the base and complete the cutting;

[0010] Reposition the base without margin and finally complete the base installation accuracy control.

[0011] Furthermore, the elevation of the center line in the cabin is established based on measuring point one, measuring point two and measuring point three; wherein measuring point one, measuring point two and measuring point three are respectively located at the front, rear end and upper opening area of ​​the bottom or platform plate in the cabin, and are marked.

[0012] Furthermore, the center line surface of the measurement base is measured, and a system is established based on measurement point four, measurement point five and measurement point six; wherein measurement point four, measurement point five and measurement point six are all located on the center line of the measurement base.

[0013] Furthermore, the virtual plane of the theoretical height of the base panel is established based on measuring points seven, eight and nine; the selection positions of measuring points seven, eight and nine are: one point is taken at the bow or stern position in the cabin, and the other two points are taken at one point on the left and right outer ports, and they are marked.

[0014] Furthermore, the base installation accuracy control is completed by verifying a virtual vertical surface parallel to the base centerline and a virtual plane reference parallel to the base installation surface originally established on the segment.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention is applicable to the precision control of segmented bases in all non-horizontal states, and is also applicable to base installations in other industries with high precision requirements. During installation operations when the ground level is destroyed, the positioning time and quality risks can be greatly reduced, thereby improving the precision and efficiency of base installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of the present invention and a schematic elevation diagram is established;

[0018] Figure 2 It is a top view of the present invention and a schematic diagram of the corresponding rib positions of the base inspection rib position alignment segment;

[0019] Figure 3 It is the first front view of the present invention and establishes a virtual plane schematic diagram;

[0020] Figure 4 A schematic diagram of the base lower opening margin H is obtained for the present invention. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0022] Reference Figure 1-Figure 4 The method for controlling the installation accuracy of a segmented base in a non-horizontal state proposed in this application specifically includes the following steps:

[0023] 1. Establish a vertical plane based on the center line of the cabin (e.g., measure points 1, 2, and 3 to establish a system). This vertical plane will serve as the width reference for the installation of the base. Measure points 1, 2, and 3 and select the locations on the front, rear, and upper areas of the cabin bottom or platform board, and mark them;

[0024] 2. Locate the center line of the base, measure the center line surface of the base (such as measuring points 4, 5, and 6 on the center line of the base), adjust it to be parallel to the newly built facade and ensure that the center line of the base meets the tolerance requirements;

[0025] 3. Then measure the base inspection rib position and adjust it to align with the corresponding rib position of the segment;

[0026] 4. In the engine room, establish a virtual plane (such as measuring points 7, 8, and 9) based on the theoretical height of the base panel (Note: for the convenience of on-site operations, it is generally used to move upwards) as the reference. This plane is used as the height reference for the installation of the base. Measure points 7, 8, and 9 to select positions, one point at the bow / stern of the cabin, and the other two points at one point on the left and right sides of the ship, and mark them.

[0027] 5. First adjust the plane of the base panel to be parallel to the virtual reference plane, measure the parallel data between the reference plane and the base plane, and perform margin trimming on the base according to the drawing data (base lower opening margin H);

[0028] 6. Survey and mark the margin of the bottom of the base and complete the cutting;

[0029] 7. Reposition the base without margin, and use a virtual vertical surface parallel to the center line of the base and a virtual plane reference parallel to the installation surface of the base originally established on the segment for verification, and finally complete the base installation accuracy control.

[0030] The present invention should mark the center line, rib inspection line, and horizontal inspection line before the segment is removed, and make horizontal marks and punches in the cabin at the base installation position. By establishing a virtual facade parallel to the center line of the base and a virtual plane parallel to the base installation surface on the segment as a reference, the base width and length direction positioning, base panel leveling, and base bottom margin determination are performed respectively. Among the three points selected when establishing the virtual facade and virtual plane, strong structural positions are preferred, and the coverage range should be larger than the base to avoid precision errors; in the process of determining the base bottom margin, the cutting of the base bottom margin should take into account welding shrinkage compensation, determine the base margin, complete the base installation precision control, and eliminate the influence of the segmentation on the base installation precision in a non-horizontal state.

[0031] In summary, the above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereto. All equivalent changes and modifications made according to the patent scope of the present invention and the contents of the specification are within the scope covered by the patent of the present invention.

Claims

1. A method for controlling the installation accuracy of a segmented base in a non-horizontal state, characterized in that: The following steps are involved: Establish a vertical plane based on the center line of the cabin, which will be used as the width reference for the base installation; Locate the datum centerline, measure the base centerline surface, adjust it to be parallel to the newly established surface and ensure that the base centerline distance dimension meets the tolerance requirements; Then measure the base to check the rib position and adjust it to align with the corresponding rib position of the segment; A virtual plane is established in the cabin based on the theoretical height of the base panel, and the plane is used as the height reference for the base installation; First, adjust the base panel plane to be parallel to the virtual reference plane, measure the parallel data between the reference plane and the base plane, and perform margin trimming on the base according to the drawing data; Survey and mark the margin of the bottom opening of the base and complete the cutting; Reposition the base without margin and finally complete the base installation accuracy control.

2. The method according to claim 1, characterized in that: The elevation of the center line in the cabin is established based on measuring points one, two and three; the locations of measuring points one, two and three are respectively located at the front, rear and upper areas of the bottom or platform board in the cabin, and are marked.

3. The method according to claim 1, characterized in that: The center line surface of the measuring base is measured and a system is established based on measuring points four, five and six; among them, measuring points four, five and six are all located on the center line of the measuring base.

4. The method according to claim 1, characterized in that: The virtual plane of theoretical height of base panel is established based on measuring points seven, eight and nine. The positions of measuring points seven, eight and nine are as follows: one point is taken at the bow or stern in the engine room, and the other two points are taken at one point on the left and right outer ports, and they are marked.

5. The method according to claim 1, characterized in that The base installation accuracy control is completed by verifying a virtual vertical surface parallel to the base centerline and a virtual plane reference parallel to the base installation surface originally established on the segment.

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