Drawing test method for enclosure system

Abstract

A drawing test method for a containment system comprises the steps that a test connecting piece is installed at the top of a disc-shaped main body, the disc-shaped main body is connected with tension equipment through the test connecting piece, a cylindrical connecting groove is formed in the top of the test connecting piece, the connecting groove is provided with internal threads, the tension equipment is provided with a hydraulic piston pump, the hydraulic piston pump is connected with a rubber pipe, and external threads are arranged at the end of the rubber pipe; a pressure gauge is fixed on the rubber pipe; and the tension equipment is in threaded connection with the connecting groove. Applying pressure to the hydraulic piston pump until the drawing tool and the ship body inner shell or the resin are broken; reading a pressure intensity value in the pressure gauge, recording the pressure intensity value, and determining whether the tensile strength meets the requirement or not. The bottom surface area is only one fifth of that of a currently used tool, inner shell paint can be damaged when a tension test is carried out, a large amount of paint make-up work is reduced by using the drawing tool, and the construction period is shortened. The installation mode is simple, the resin adhered to the device can be easily removed after the test, the device can be repeatedly used, and the cost is reduced.

Description

Technical Field

[0001] The invention belongs to the field of marine ship design and construction, and in particular relates to a pull-out test method for a containment system. Background Art

[0002] The Mark containment system is a patent of the French company GTT. It is a non-self-sustaining cargo containment system. The insulation layer of the containment system needs to be bonded to the inner hull of the ship through low-temperature resin. During the construction of the actual ship, the adhesion performance between the low-temperature resin, the inner hull paint and the inner hull of the ship needs to be verified through a tensile test before the insulation board is installed. Once the adhesion performance does not meet the standard, it may cause problems in the entire system and lead to failure.

[0003] Tensile tests require special tooling, such as Figure 1 As shown in the figure, the type of drawing tool currently used is made of carbon steel, with a circular plate 3 with a diameter of 50mm and a thickness of 14mm at the front end and an M10 screw 1 with a thread 2 at the rear end, and the two are connected together by welding or threading. During the test, a low-temperature resin 5 is applied on the circular plate 3. The diameter of the resin 5 is the same as that of the drawing tool, and the thickness is at least 10mm. Then it is adhered to the hull 4 of the hull. During the curing process of the resin, it is fixed with a magnetic clamp. After the low-temperature resin 5 is cured, it is installed on the hull through the thread. Figure 2 In the pulling device shown, the screw rod 1 of the pulling tool is connected to the pulling device connecting piece 9 through the thread 2. After the connection, the hydraulic piston pump 7 is pressed to apply pressure, and the pressure value can be read from the pressure gauge 8. The pulling force is continuously applied until it breaks, and the pulling strength at the time of breaking is recorded to confirm whether it meets the requirements. The specific requirements are shown in Table 1.

[0004] Although this method can achieve the purpose of tensile testing, it has the following disadvantages: 1 According to the specification requirements, a 170,000 cubic meter LNG ship has more than 100 test points in each cabin, which will damage the inner shell paint after the test. The front circular plate 3 of the currently used drawing tool has a large area, which will generate a lot of repainting work after the test.

[0005] 2 After the test, the drawing tool cannot be reused well. The main reason is that after removing the sticky low-temperature resin, it is difficult to keep clean and it is easy to rust. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a pull-out test method for a containment system, and the technical solution adopted is: A pull-out test method for a containment system comprises a disc-shaped main body, a transition piece is fixed on the top of the disc-shaped main body, the transition piece gradually becomes larger from top to bottom and is in a trumpet shape, a pancake-shaped handle is fixed on the top of the transition piece, resin is applied on the surface of the disc-shaped main body, the disc-shaped main body with resin is adhered to the hull of a ship at a test point under different open times and temperatures, shaping accessories are placed on the disc-shaped main body, and the shaping accessories are removed when the resin is cured.

[0007] A test connector is installed on the top of the disc-shaped body and connected to the tension equipment through the test connector. The test connector has a box-shaped body. One side of the box-shaped body is open, and the opening of the box-shaped body faces forward. A strip channel is opened at the bottom. The top of the transition piece is inserted into the strip channel, and the round pancake handle is located inside the frame-shaped body.

[0008] A cylindrical connecting groove is arranged on the top of the test connector, the connecting groove has an internal thread, the tension device has a hydraulic piston pump, the hydraulic piston pump is connected to a rubber tube, an external thread is arranged at the end of the rubber tube, a pressure gauge is fixed on the rubber tube, and the tension device is threadedly connected to the connecting groove.

[0009] Apply pressure to the hydraulic piston pump until the puller breaks from the hull or resin.

[0010] Read the pressure value in the pressure gauge and record it to confirm whether the tensile strength meets the requirements.

[0011] The above-mentioned containment system pull-out test method, further, the shaping accessories include a door-type frame body, a slot is opened in the top center of the door-type frame body, the top of the transition piece is inserted into the slot, and a magnet is arranged at the bottom of the door-type frame body, and the magnet is adsorbed on the inner shell of the hull.

[0012] In the above-mentioned pull-out test method for a containment system, further, the size of the resin is the same as the size of the disc-shaped body, and the thickness is greater than 10 mm.

[0013] The above-mentioned pull-out test method for the enclosure system further comprises removing the molding accessories after 48 hours and completely curing the resin.

[0014] In the above-mentioned pull-out test method for a containment system, further, the disc-shaped body, the transition piece, the round pancake-shaped handle, the shaping accessories, and the test connector are all made of stainless steel.

[0015] In the above-mentioned pull-out test method for a containment system, further, the diameter of the disc-shaped body is 10~20mm.

[0016] In the above-mentioned pull-out test method for a containment system, further, a magnet is bonded to the bottom of the door-shaped frame.

[0017] The beneficial effects of the present invention are: 1 The bottom surface area of ​​the present invention is only one fifth of that of the currently used tooling. The tensile test will damage the paint on the inner shell. The use of the pulling tooling can reduce a lot of repainting work and shorten the construction period.

[0018] 2 The present invention is equipped with corresponding shaping accessories and tension equipment connectors, the installation method is relatively simple, the connection method adopted is very firm, and a good fixing effect can be achieved.

[0019] 3 The material of the present invention is stainless steel, and the resin adhering thereto can be easily removed after the test, and the material can be reused repeatedly, thus reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The tooling used for the tensile test; Figure 2 Schematic diagram of the tension equipment structure; Figure 3 It is a schematic diagram of the structure of the drawing tool of the present invention; Figure 4 It is a schematic diagram of the use of stereotyped accessories; Figure 5 This is a front view diagram of the test connector. Figure 6 yes Figure 5 Schematic diagram of the AA section; Among them, 1-disc-shaped body, 2-pancake-shaped handle, 3-transition piece, 4-hull, 5-resin, 7-hydraulic piston pump, 8-pressure gauge, 11-molding accessories, 15-magnet, 17-test connector, 18-internal thread. DETAILED DESCRIPTION

[0021] like Figure 3 As shown, a pull-out test method for a containment system includes a pull-out tool, the pull-out tool has a disc-shaped body, a transition piece is fixed on the top of the disc-shaped body, the transition piece gradually becomes larger from top to bottom and is trumpet-shaped, a round pancake handle is fixed on the top of the transition piece, resin is applied on the surface of the disc-shaped body, the disc-shaped body with resin is adhered to the hull of the test point at different open times and temperatures, a shaping accessory is placed on the disc-shaped body, and the shaping accessory is removed after the resin is cured. The diameter of the disc-shaped body is 10~20mm, and the diameter of the round pancake handle is slightly smaller than the diameter of the disc-shaped body, which is very small.

[0022] A test connector is installed on the top of the disc-shaped body and connected to the tension equipment through the test connector. The test connector has a box-shaped body. One side of the box-shaped body is open, and the opening of the box-shaped body faces forward. A strip channel is opened at the bottom. The top of the transition piece is inserted into the strip channel, and the round pancake handle is located inside the frame-shaped body.

[0023] A cylindrical connecting groove is arranged on the top of the test connector, the connecting groove has an internal thread, the tension device has a hydraulic piston pump, the hydraulic piston pump is connected to a rubber tube, an external thread is arranged at the end of the rubber tube, a pressure gauge is fixed on the rubber tube, and the tension device is threadedly connected to the connecting groove.

[0024] Apply pressure to the hydraulic piston pump until the puller breaks from the hull or resin.

[0025] Read the pressure value in the pressure gauge and record it to confirm whether the tensile strength meets the requirements.

[0026] During the test, the shaping accessory 11 is needed to temporarily fix the drawing tool. The two are used together as follows: Figure 4 The molded accessories include a door-shaped frame body, a slot is opened at the center of the top of the door-shaped frame body, the top of the transition piece is inserted into the slot, and a magnet is arranged at the bottom of the door-shaped frame body, and the magnet is adsorbed on the inner shell of the hull.

[0027] In order to verify the adhesion performance between the low-temperature resin 5 of the LNG ship cargo hold and the hull 4 of the ship, before the installation of the insulation layer of the actual ship, it is necessary to use the above-mentioned drawing tool 10 and the shaping accessories 11 to perform a resin tensile test. The specific test steps are as follows: (1) A resin 5 having a diameter the same as that of the drawing jig 10 and a thickness of at least 10 mm is coated on the drawing jig 10 using the resin used for bonding the insulating board. The drawing jig 10 with the resin 5 is bonded to the inner hull 4 of the hull coated with the test point at different open times and temperatures. Before the resin 5 is cured, a shaping accessory 11 needs to be installed on the drawing jig 10. The shaping accessory 11 can be fixed to the inner hull 4 of the hull through a magnet 15 at the bottom, and the two parts are connected together through a groove 13, thereby fixing the drawing jig 10.

[0028] After 48 hours, the low-temperature resin 5 is cured, and the molding accessories 11 are removed to perform a tensile test.

[0029] (2) If Figure 6 As shown, the drawing tool 10 is connected to the hydraulic piston pump 7 through a test connector 17. The test connector 17 is designed in the form of a fixture that matches the shape of the drawing tool 10. It is made of stainless steel. The size of the opening is determined according to the top and middle diameters of the drawing tool 10, and can be completely matched with it. The design of hollow front and solid back can not only be installed together with the drawing tool 10 in a sliding manner, but also prevent the connector 17 from slipping when the tensile test is performed on the transverse bulkhead, affecting the test process and results. A slot is provided on the upper part of the test connector, and a thread 18 is provided in the slot, through which the test connector can be connected to the tensile equipment.

[0030] (3) After the connection is completed, the test is officially started. Pressure is applied to the hydraulic piston pump 7. The applied tension should meet the standards shown in Table 1 until the pulling fixture 10 and the hull 4 or the resin 5 are broken.

[0031] (4) Read the pressure value in the pressure gauge 8, record it, and confirm whether the tensile strength meets the requirements. Although the surface area of ​​the drawing fixture 10 is reduced, the corresponding tensile strength requirement will also be reduced, but the value read in the pressure gauge 8 is the pressure value, so the tensile test standard has not changed and remains the value in Table 1.

[0032] (5) Remove the resin 5 on the drawing tool 10, and it can be reused after cleaning.

[0033] Specific application examples are as follows: (1) Four samples were prepared at a temperature of 15°C, a humidity of 7%, and an open time of 90 minutes, 110 minutes, and 120 minutes, respectively. The tensile test sample preparation process is as follows: a resin 5 with a diameter of 15 mm and a thickness of 12 mm was coated on a drawing tool 10 with a diameter of 15 mm.

[0034] (2) After the open time is over, the sample is adhered to the inner hull 4 of the hull where the test point is coated. Before the resin 5 is cured, it is necessary to install a shaping accessory 11 on the sample to prevent it from displacement.

[0035] (3) After 48 hours, the resin 5 is completely cured and the molding accessories are removed. The sample is connected to the hydraulic piston pump 7 using the test connector 17, and the tensile test is officially started. Pressure is applied to the hydraulic piston pump 7 until the sample and the hull 4 or the resin 5 are broken.

[0036] (4) After each test, read the pressure value in the pressure gauge 8 and obtain the following results: The results obtained all meet the requirements in Table 1. The test is successful and the adhesion performance between the low-temperature resin, the inner hull paint and the inner hull of the hull meets the standards.

Claims

1. A pull-out test method for a containment system, characterized in that: The drawing tool has a disc-shaped body (1), a transition piece (3) is fixed on the top of the disc-shaped body, the transition piece gradually becomes larger from top to bottom and is in the shape of a trumpet, a round pancake-shaped handle (2) is fixed on the top of the transition piece, resin (5) is applied on the surface of the disc-shaped body, the disc-shaped body with the resin is adhered to the inner shell of the hull at the test point, and a shaping accessory (11) is placed on the disc-shaped body. When the resin is cured, the shaping accessory is removed; A test connector (17) is installed on the top of the disc-shaped body and connected to the tension device through the test connector. The test connector has a box-shaped body, one side of the box-shaped body is open, the opening of the box-shaped body faces forward, a strip channel is opened at the bottom, the top of the transition piece is inserted into the strip channel, and a round pancake handle is located inside the frame-shaped body; A cylindrical connection groove is provided at the top of the test connection piece, the connection groove has an internal thread (18), the tension device has a hydraulic piston pump (7), the hydraulic piston pump is connected to a rubber tube, the end of the rubber tube is provided with an external thread, a pressure gauge (8) is fixed on the rubber tube, and the tension device is threadedly connected to the connection groove; Apply pressure to the hydraulic piston pump until the pulling tool breaks from the hull or resin; Read the pressure value in the pressure gauge and record it to confirm whether the tensile strength meets the requirements.

2. A pull-out test method for a containment system according to claim 1, characterized in that: The shaping accessories include a door-type frame body, a card slot is opened at the top center of the door-type frame body, the top of the transition piece is inserted into the card slot, and a magnet is arranged at the bottom of the door-type frame body, and the magnet is adsorbed on the inner shell of the hull.

3. A pull-out test method for a containment system according to claim 1, characterized in that: The resin size is the same as the disc-shaped body size, and the thickness is greater than 10mm.

4. A pull-out test method for a containment system according to claim 1, characterized in that: After 48 hours, the molding accessories are removed and the resin is completely cured.

5. A pull-out test method for a containment system according to claim 1, characterized in that: The disc-shaped body, transition piece, pancake-shaped handle, shaping accessories and test connectors are all made of stainless steel.

6. A pull-out test method for a containment system according to claim 1, characterized in that: The diameter of the disc-shaped body is 10~20mm.

7. A pull-out test method for a containment system according to claim 2, characterized in that: The magnets are bonded to the bottom of the door frame.

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