CB/T 3586-1994 Technical requirements for partial patching and large-area replacement of hull CB/T3586-1994 standard download decompression password: www.bzxz.net

Ship Industry Standard of the People's Republic of China
Technical requirements for partial patching and large-area replacement of hull CB/T 3586--94
Classification number: R31
1 Topic content and scope of application
This standard specifies the inspection, technical requirements and acceptance rules for partial patching and large-area replacement of hull plates of steel seagoing ships. This standard applies to steel seagoing ships and can also be implemented by reference to other ships. Application standards
CB 25?
CB3136
CB'3177
CB*3190
CB*3195
Test method for tightness of hull of steel seagoing ships
Hull construction accuracy standard (L≥90m)
Rules for radiographic and ultrasonic inspection of steel welds for civil ships Type of welding grooves of hull structuresbzxZ.net
Hull of small and medium-sized ships Construction Accuracy Standards
《Steel Seagoing Vessel Classification and Construction Specifications》1989 China Classification Society China Super Ship Industry Corporation 1994-10--08 Batch 46
1995--08-01 Implementation
3 Inspection
CB/T3586-94
3.1 After the ship enters the factory, the shipowner, the ship inspection department and the factory jointly inspect the actual ship.
3.2 After the inspection, the specific location and scope of the shell plate replacement shall be determined according to the damage, wear and tear and change of the shell plate, the requirements of the shipowner's repair project list and the opinions of the ship inspection department.
3.3 After the inspection, the factory shall formulate a reasonable replacement process plan, and the construction can be carried out according to the process after obtaining the approval of the ship inspection department. 3.4 When the hull plate is replaced in a large area, the base line measurement of the hull should be carried out and the original hull deflection value should be recorded. 4 Technical requirements for hull replacement
4.1 General requirements
4.1.1 When the hull plate is replaced partially or in a large area, the chemical composition and mechanical properties of the replaced plate should be basically the same as the original plate. If necessary, the material test and mechanical property test of the new and old plates should be carried out according to the requirements of the ship inspection department, and the material certificate and test report should be submitted.
4.1. The rolling direction of the plate should be consistent with the longitudinal direction of the hull as much as possible. 4.1.3 The thickness of the replaced plate should be the same as the thickness of the original plate in principle. 4.1. 4
After the hull plate is cut, the deformed edge of the opening should be corrected by pyrotechnics to make it smooth.
Determination and requirements of the position of the replacement plate seam
The tangent line of the replacement plate should be cut as close as possible to the original seam. The distance between the butt welds should not be less than 100mm, and the sharp corners should be avoided. The distance between the butt joint of the plate and the corner joint of the nearest plate and component shall not be less than 50mm.
4.2.3When the side joint and end joint of the new plate are not on the original plate seam, the corner of the new plate should be cut into a rounded shape, and the radius of the rounded shape shall not be less than 10t (t is the plate thickness), and shall not be less than 100mm.
4.2.4The old plate seam should be extended and cut, and the cutting length shall not be less than 150mm. 4.3 Requirements for welding of butt plate seams
4.3.1When replacing the plate, the groove type can be selected according to CB3190. If other groove types are used, the approval of the ship inspection shall be obtained first. 4.3.2 Where double-sided welding is difficult, it is allowed to add a backing plate on the back (inside) and weld the outer side to form the groove. The groove type is shown in Table 1. Table 1
0t—t<4
=4～5
t -t≥4
L=4(t)
45°±5°
1 45±5*
After welding, the back side shall be grooved at the root by carbon arc gouging, and the carbonized layer and burrs on the groove surface shall be polished, and then the bottom welding shall be carried out. 4.3. 4
For welding between the shell plate and the internal components, the welding type CB/T 3586-94
of the original ship shall be adopted, or selected in accordance with the relevant provisions of the "Rules for Classification and Construction of Sea-going Steel Ships". 4.4 Welding materials
4.4.1 The grade of welding materials used shall be compatible with the plate. 4.4.2 When the grades of the two plates to be welded are different, except for the use of higher grade welding materials in the structural discontinuity or stress concentration area, welding materials compatible with the lower grade of steel can generally be selected. 4.4.3 When the following welds are encountered during the replacement of hull plates, low hydrogen weld strips are required: a.
Annular butt joints during the large hull assembly:
b. For ships with ice reinforcement, the end seams and side seams of the hull plate;
C. Continuous welds between the outer plate and the outer plate. 4.5 Hull deformation control during large-scale replacement of hull plates 4.5.1 For large-scale replacement of hull plates, a reasonable phased and batch replacement process should be formulated, and corresponding reinforcement should be adopted to control the deformation of the hull. If necessary, strength and shape calculation and measurement work should be carried out. 4.5.2 When replacing the bottom plate in a large area, the bottom piers shall not be dismantled too much, and the bottom piers shall be installed immediately after the plate replacement.
4.5.3 When welding the plate seams and frames, the welding shall be symmetrical and the welding frequency shall be “longitudinal first and then transverse”.
4.5. Requirements for frames connected to the hull plate When replacing a large area, the number of frames to be dismantled at the same time shall not be too large, and the frames shall be supported and strengthened after being dismantled. 4.6 Accuracy requirements for hull plate replacement
4.6.1 The various assembly accuracy requirements during the replacement process can refer to CB*3136 or CB*3195.
4.6.2 Accuracy requirements after completion Table 2 . 49
C8/T3586-94
Almost missing body part (within the 0.6L
area of ​​the ship)
Other parts
Middle outer plate
, rolled panel
Frame spacing
Front. Rear
Allowance
≤6.08.0
≤7.0≤9.0
If the allowable limit is exceeded, it shall be repaired by the
correction method or cut
open and then assembled with correction welding| |tt||4.6.3 When replacing a large area of ​​hull plating, the baseline measurement of the hull shall be carried out after completion. The deflection of the hull due to arching or sagging shall generally not exceed L/1000 (L is the length between two columns).
Test and acceptance
CB/T3586-94
5.1 After welding is completed, the quality of the welds shall be inspected. Non-destructive testing of welds may be carried out according to the requirements of the ship inspection or the proportion determined by negotiation. The method shall be in accordance with CB3177. Unqualified welds shall be repaired and then inspected. Tightness test can be carried out in accordance with the relevant provisions of CB*257. 5.2
5.3 After the test, a weld tightness test report and a non-destructive testing report should be submitted. Additional remarks:
This standard was proposed by the Ship Repair Sub-Technical Committee of the National Technical Committee for Standardization of Marine Ships.
This standard is under the jurisdiction of Tianjin Ship Repair Technology Research Institute. This standard was drafted by Dalian Shipyard, with participation from Dalian Ship Inspection Bureau, Dalian Steamship Company, and Navy 4810 Factory.
The main drafters of this standard are Zeng Si, Zheng Bencheng, etc. 51
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.