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JT/T 39-2019 English PDF

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JT/T 39-2019: Technical requirements for salvaging wreck with steel camel
Status: Valid

JT/T 39: Historical versions

Standard IDUSDBUY PDFLead-DaysStandard Title (Description)Status
JT/T 39-2019229 Add to Cart 3 days Technical requirements for salvaging wreck with steel camel Valid
JT/T 39-1993279 Add to Cart 3 days Technical Requirements for Salvaging Wreck With Pontoon Obsolete

Similar standards

JT/T 746   JT/T 745   JT/T 1364   

Basic data

Standard ID: JT/T 39-2019 (JT/T39-2019)
Description (Translated English): Technical requirements for salvaging wreck with steel camel
Sector / Industry: Highway & Transportation Industry Standard (Recommended)
Classification of Chinese Standard: R51
Classification of International Standard: 03.220.40
Word Count Estimation: 10,182
Date of Issue: 2019
Date of Implementation: 2019-10-01
Issuing agency(ies): Ministry of Transport
Summary: This standard specifies the basic requirements for salvaging sunken ships with steel buoys, as well as the requirements for buoy configuration, buoy wire and shackle selection, inspection before buoy transportation and buoy transportation, buoy sinking, buoying and buoying, and towing after buoyancy. This standard applies to steel buoys for salvaging sunken ships in waters with a water depth of not more than 60m.

JT/T 39-2019: Technical requirements for salvaging wreck with steel camel

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Technical requirements for salvaging wreck with steel camel

Contents

Foreword III 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Basic requirements for pontoon salvaging sunken ships 2 ５ Buoy configuration 4 6 Options for pontoon cable and shackle 5 7 Inspection and transportation before pontoon transportation 5 8 Settling of pontoons 6 9 Wreck of shipwreck 7 10 Tow after the wreck 7 JT/T 39-2019

Foreword

This standard is in accordance with GB/T Draft the rules given in 1-2009. This standard replaces JT/T 39-1993 "Technical requirements for pontoon fishing and sunken ships". Compared with JT/T 39-1993, this standard The main technical changes outside the reform are as follows. --- Added terms and definitions for buoy steel cables, buoy shackles, jack holes, shofar, fairleads, cable piles, quick-sinking valves (see 3.1, 3.2, 3． 10 ～ 3. 14), revised terms and definitions for lifting buoyancy and salvage weight of sunken ships (see 3.3 and 3.8, 2.5,.1993 edition 2． 9), deleted the terms and definitions of bottom length and buoy staying cable (see 2.7, 2.8 of the.1993 edition); --- Added basic requirements for pontoon salvaging sunken ships (see Chapter 4); --- Increased the calculation requirements for the main data when using one or two pairs or more of pontoons for fishing construction (see 4.2,.1993 version) Chapter 3); --- Increased the basic specifications of the pontoon (see 5.1); --- Modified the layout requirements for pontoons (see Chapters 4, 5 of the.1993,.1993 edition) and the layout requirements for control pontoons (see 5.3,.1993 Chapter 6 of the Annual Edition); --- Modified the optional requirements for buoyant steel cables (see Chapter 6.1, Chapter 7 of the.1993 edition); --- Increased optional requirements for buoy shackle (see 6.2); --- Added matching rules for buoy steel cables and shackles (see 6.3); --- Increased inspection and transportation requirements before pontoon transportation (see Chapter 7); --- Modified the buoy steel cable lead-through (see Chapter 8, Chapter 8 of the.1993 edition); --- Modified the pre-sinking inspection (see Chapter 8.2, Chapter 9 of the.1993 edition); --- Revised the sinking of the pontoons (see 8.3, Chapter 9 of the.1993 edition); --- Increased preparation and inflation requirements before lifting (see 9.1 and 9.2); --- Increased state control after the wreck (see 9.4); --- Modified the towing after the sunken ship floated (see Chapter 10, Chapter 14 of the.1993 edition). This standard is proposed by and under the jurisdiction of the Technical Committee for Transport Rescue and Underwater Engineering Standardization. This standard was drafted. Yantai Salvage Bureau of the Ministry of Transport. The main drafters of this standard. Hu Weidong, Lou Rui, Du Weiping, Liu Yang, and Sun Chenyang. The previous versions of the standards replaced by this standard are. --- JT/T 39-1993. JT/T 39-2019 Technical requirements for salvaging sunken ships with steel buoys

1 Scope

This standard specifies the basic requirements for salvaging a sunken ship with a steel pontoon, as well as the pontoon configuration, the pontoon cable and shackle options, and Check the requirements for pontoon transportation, pontoon settling, sunken ship floating, towing after sunken ship floating. This standard applies to steel buoys for salvaging sunken ships in waters with a depth of no more than 60m.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T 1227 Precision Pressure Gauge GB/T 8918 wire rope for important uses GB/T.200667 thick diameter steel wire rope Technical Regulations for Statutory Survey of Inland Ships of the Maritime Safety Administration of the People's Republic of China Technical Regulations for Statutory Surveys of Maritime Ships in China Rules of the People's Republic of China Maritime Safety Administration for Ships and Offshore Installations China Classification Society Guidelines for Maritime Towing.2011 International Maritime Organization International Convention on the Safety of Life at Sea Convention) MSC. Resolution 266 (84) Safety Codes for Special Purpose Ships (Code of the safety foresight)

3 Terms and definitions

The following terms and definitions apply to this document. 3． 1 Buoy steel cable In the process of pontoon salvaging a sunken ship, a ring-shaped steel rope loop for lifting the sunken ship. 3． 2 Buoy shackle In the process of pontoon salvaging a sunken ship, a combination of a built-in twisted wire buckle and a pin is used to connect the pontoon steel cable. 3． 3 Weight of shipwreck water of water wrink in water The sum of the weight of the wreck in the empty ship, the weight of the remaining mud in the tank and the weight of the remaining cargo in the tank. 3． 4 Salvage weight of shipwreck salvaging weft of wreck The sum of the weight of the wreck in the water and the adsorption force of the seabed on the wreck. 3． Five Center of gravity in shipwreck center of gravity of water of in the water JT/T 39-2019 The center of gravity of the sunken ship's empty ship, the center of gravity of the remaining mud water and the center of gravity of the remaining cargo water are superimposed. 3． 6 Longitudinal position of the center of gravity in the wrecked water lungitudinal position of off of off of off of gravity of inking The center of gravity of the shipwreck faces the position of the ship in the direction of the captain. 3． 7 The vertical position of the center of gravity in the wrecked water vertical of off of center of off of gravity of the inking of the water The center of gravity of the wreck in the water is perpendicular to the baseline. 3． 8 Lift buoyancy The buoy provides buoyancy to the sunken ship. 3． 9 Adsorption force When the sunken ship floats, the adhesion between the hull and the surface of the bottom of the sea. 3． 10 Qianjindong Virorepe holle Under the seabed at the bottom of the shipwreck, vertically pass through the channel for the buoyant steel cables on both sides of the wreck. 3． 11 Fairlead pass hole Round bell mouth structure that is symmetrically distributed at both ends of the buoy and is used to guide the buoy steel cable. 3． 12 Mast bitt It is arranged on the port side top of the buoy, on both sides of the fairlead nozzle, and is used as a pile head for coiling and fixing the cable. 3． 13 Submerged valve A valve body installed on the top of the outer cylinder of the buoy for sinking the buoy.

4 Basic requirements for pontoon salvaging sunken ships

4． 1 Salvage plan 4． 1． 1 Data collection and shipwreck survey Data collection and shipwreck survey should include the following. a) the name, type and structure of the shipwreck; b) the sinking time, the reason for the sinking and the detailed process; c) the layout of the superstructure of the sunken ship, the access to the cabins, the position, status and number of hatches; d) the state of inclination of the ship's hull; e) the situation of sunken ships; f) damage and leaks of the sunken ship; g) cargo condition of the sunken ship; h) the status of silt in the shipwreck; i) Hydrological and meteorological conditions such as water depth, sediment, tide, and current at the sinking site. 4． 1． 2 Scheme Design The plan design should include the following. JT/T 39-2019 a) calculation of lifting buoyancy; b) lifting buoyancy configuration scheme; c) the process of salvaging and floating; d) Design of pontoon cable and anti-skid cable; e) Salvage site layout plan; f) a treatment plan for the wreck after floating; g) Solutions to construction difficulties. 4． 2 Data calculation 4． 2． 1 When using a pair of pontoons for salvage construction, the following data should be calculated. a) the salvage weight of the sunken ship; b) the vertical position of the buoyancy lifting buoyancy integrated buoyancy center and the vertical position of the center of gravity of the weight of the wreck salvage; c) Longitudinal position of the integrated buoyancy centre equipped with lifting buoyancy and longitudinal position of the centre of gravity of the sunken ship; d) the local structural strength of the pontoon and the local structural strength of the shipwreck, and the interaction forces between the pontoon and the shipwreck's contact position; e) the stability and buoyancy of the pontoon and the sunken ship after the pontoon is lifted; f) the distance and speed of the buoy; g) the longitudinal strength of the shipwreck; h) Lifting angle and slipping force of the pontoon. 4． 2． 2 When using two or more pairs of pontoons for salvage construction, the longitudinal position of the lifting buoyancy center should be calculated. 4． 3 Working mother ship A working mother ship shall be provided for the pontoon salvage shipwreck construction. The working mother ship shall meet the following requirements. a) various surveys required by the "Statutory Survey Rules for Ships and Offshore Facilities" and/or the SOLAS Convention; b) the provisions of the Safety Code for Special Purpose Ships; c) the provisions of the Technical Regulations for Statutory Surveys of Inland Ships; d) It can work normally under the operating condition of Puddler wind level 6 (sea level 5) under comprehensive sea conditions. 4． 4 Construction staff The pontoon fishing construction staff should include. a) Engineering commanders with experience in managing shipwreck salvage projects; b) salvage engineering technical personnel engaged in salvage engineering design; c) engineering and technical personnel engaged in the construction of salvage projects; d) Qualified divers, dive supervisors and dive life support personnel. 4． ５ Construction equipment The following construction equipment should be provided for pontoon fishing. a) Buoys whose performance meets the requirements of GB/T.20067 and GB/T 8918, and the number and specifications of which meet the design requirements of the construction plan Steel cable b) The number of air distribution boxes that meet the design requirements of the buoy inflation when the sunken ship finally floats; A pressure gauge that can meet the pressure requirements during construction. The performance of the pressure gauge should meet the requirements of GB/T 1227; c) A buoy shackle that meets the construction design requirements; d) other equipment required for construction. JT/T 39-2019

5 Buoy configuration

5． 1 Basic specifications of the pontoon See Table 1 for basic specifications of the pontoon. Table 1 Basic specifications of the pontoon Float Specifications Shell length (M) diameter (M) Rated buoyancy in sea water (T) Salvage depth (M) 1 250t salvage buoy 13. 42 5. 72 258 60 2 500t salvage pontoon 17. 00 7. 08 506 60 3 800t salvage buoy 20. 7 8.8. 4 808. 1 60 4 1.2000t fishing buoy 22. 8 IX. 8 1 253. 1 60 5． 2 Float arrangement 5． 2． 1 Buoy layout area Before the pontoon is set, the buoy layout area should be inspected to remove obstacles that hinder the buoy's deployment. 5． 2． 2 Longitudinal position of the pontoon The longitudinal position of the pontoon (ie the position in the direction of the wreck of the ship) shall meet the following requirements. a) The distance between the two ends of the sunken ship and the side pontoons not less than 2m; b) The longitudinal position of the integrated buoyancy center equipped with lifting buoyancy is as close as possible to the longitudinal position of the center of gravity of the shipwreck. 5． 2． 3 Vertical position of the pontoon The vertical position of the pontoon (that is, the position in the deep direction of the sunken ship) shall meet the following requirements. a) The vertical position of the integrated buoyancy center equipped with lifting buoyancy is higher than the vertical position of the center of gravity of the sunken ship. 5m; b) Due to engineering restrictions, the overall initial stability of the pontoon lifter is not less than 0. 15m. 5． ３ Control buoy configuration 5． 3． 1 When the site water depth is less than one third of the length of the shipwreck, the maximum speed of buoy lift shall not be greater than 3 m/s. 5． 3． 2 When the site water depth is greater than or equal to one third of the length of the ship's shipwreck, the maximum speed of buoy lift shall not be greater than 1 m/s. 5． 3． 3 When the floating speed of the buoy exceeds the design requirements, the control buoy should be added. 5． 3． 4 The configuration of the control buoy shall meet the following requirements. a) According to the calculated buoyancy speed, buoy stability and buoyancy conditions, design and select appropriate buoys and buoy steel for buoys. Cable length b) When designing for inflation and buoyancy, the control buoy can still play a controlling role after the water is discharged; c) The control buoys should be arranged at the stern ends of the sunken ship. During the arrangement, the pontoon cables should be prevented from contacting the damaged position of the sunken ship or appearing. Uneven force. JT/T 39-2019

6 Optional float cable and shackle

6. 1 Matching of pontoon cable When carrying out pontoon fishing construction, the selection of pontoon cable should meet the following requirements. a) The specific number of pontoon cables used for each pair of pontoons is determined according to the actual situation of the shipwreck and the design requirements. The use of each pair of pontoons should not be less than Two pontoon cables b) the final position of the buoy shackle is inside the pontoon fairway; c) The pontoon cable should eventually be able to hang on the pontoon pile. 6. ２ Matching of buoy shackle When carrying out the pontoon salvage construction, the overall dimensions of the pontoon shackle should be sufficient to allow smooth entry into the pontoon cable guide hole and smooth connection with the pontoon cable Lee's requirements. 6. 3 Matching rules for buoy cables and shackles According to the static load and dynamic load of the buoy cable and shackle, the matching rules of the buoy cable and shackle should meet the requirements of Table 2. Table 2 Matching rules for buoy steel cables and buoy shackles Float Specifications Breaking force of pontoon cable (single channel) (T) Number of steel cables Burst breaking force (T) 1 250t salvage buoy is not less than 364, four is not less than 100 2 500t salvage buoy is not less than 490 four lanes is not less than.200 3 800t salvage buoy is not less than 588 six lanes is not less than.200 4 800t salvage buoy is not less than 864, four is not less than 300 5 1.200t Salvage buoy is not less than 864, six lanes is not less than 300 6 1.200t Salvage buoy is not less than 1 324 four lanes is not less than 400

7 Inspection and transportation before pontoon transportation

7. 1 Inspection before pontoon transportation The inspection content and requirements before the pontoon transportation include. a) The shell of the pontoon should be intact and undamaged, the guards should be intact and firm, and the structures such as horns and pile heads should not be damaged and rusted; b) switches such as pontoon subsea door switches, quick-sink valve switches, pile head bolts, and intake valve groups should be able to open and close normally; c) The types and quantity of accessories such as buoy wrenches, inflatable hoses and shackles should be complete and available. 7. 2 Transportation of pontoons 7. 2． 1 Floating Trailer Transport Floating trailer transportation should meet the following requirements. a) The specifications and certificates of tugboats and towing rigs are in accordance with the relevant provisions of the Maritime Tow Guide.2011; b) Close the pontoon submarine door, manhole, quick sink valve, and intake valve group before towing. During the towing process, someone has towed the pontoon tow ropes and towing JT/T 39-2019 Observation and inspection of force points and pontoon draught. 7. 2． 2 Shipping Ships shall comply with the Guidelines for Maritime Towing.2011 and relevant regulations of the International Maritime Organization.

8 Settling of the pontoon

8. 1 buoy steel cable lead 8. 1． 1. Attack the jackhole according to the technical plan of the pontoon salvaging shipwreck. The position deviation of the entrance and exit of the jackhole should be less than the pontoon cable. 10% of the length of the bottom. 8. 1． 2 When a jackhole penetrates two pontoon cables at the same time, the two cables must not be tangled, and the distance between the two cables at the entrance should not be less than 1． 2m. 8. 1． When using three pontoon cables for 3800t and 1,200t pontoons, it is advisable to pass through the pontoon cables through the four cable guide holes inside the pontoon. 8. 2 Check before the float is set 8. 2． １ Check for the preparation for buoy sinking The inspection of the pontoon preparation work includes the following. a) The connection position of the inflatable tube and the two tubes should be free of air leakage and damage and meet the connection requirements of the fishing plan. Do a stress test; b) A pressure gauge should be installed in the air distribution box, and there should be no air leakage at the connection position between the air distribution box and the inflation pipe. Stress test c) Inflatable equipment and test run the inflatable equipment. 8. 2． 2 Functional check of pontoon The pontoon functional check includes the following. a) The cylinder above the waterline at no load should have no air leakage; b) all valves of the buoy should be undamaged and operate flexibly and reliably; c) The pontoon cable pile shall meet the requirements of the fishing plan. 8. 3 Float sinking 8. 3． 1 Tie two steel wires to the pontoon before settling to control the state of the pontoon when settling. Wire length and diameter according to water depth and pontoon Select the weight in the water, and don't damage the barrel when sinking the float. 8. 3． 2 The air distribution box is placed in an orderly manner, and the placement position enables the operator to look directly at the buoy. The inflatable tube of each pontoon should be tied and fixed. And mark the connection of the distribution box. 8. 3． 3 According to the requirements of the fishing plan, choose the buoy shackle that is matched with the buoy steel cable. When connecting the buoy shackle, one end of the buoy should be adjacent The buoy steel cables near the pontoon cable guide hole are connected. 8. 3． 4 Hanging of pontoon cable to the cable pile shall meet the following requirements. a) The buoyant steel cable is hung on the designated cable pile according to the design requirements of the fishing plan, and then the angle of the cable pile is adjusted; b) After the buoy steel cable is hung to the cable pile, pull the buoy steel cable in the opposite direction, so that the buoy steel cable is tightly sleeved on the cable pile and the safety pin of the cable pile is inserted; c) The final position of the buoy shackle is inside the fairlead. 8. 4 After the float is set 8. 4． 1 After the pontoon is settled, measure the actual distance from the top of the pontoon on both sides of the wreck to ......
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