LNG fuel tank pressure wood installation and its cryogenic epoxy material pouring method

Abstract

The application discloses a LNG fuel tank pressure-bearing wood installation and a low-temperature epoxy material pouring method thereof, which comprises a shore-based construction step and a ship body internal construction step, the shore-based construction step comprises a vertical support pressure-bearing wood installation and a low-temperature epoxy material coating process; the ship body internal construction step comprises a vertical support epoxy pouring process, an anti-rolling support pressure-bearing wood installation and a low-temperature epoxy material pouring process, a longitudinal limiting support pressure-bearing wood installation and a low-temperature epoxy material pouring process and a floating stop support pressure-bearing wood installation and a low-temperature epoxy material pouring process. The method has the advantages of high reliability and good quality of low-temperature epoxy material construction.

Description

Technical Field

[0001] This invention relates to the field of ship fuel tank modification technology, and in particular to an installation method for pressure-bearing timber in an LNG fuel tank and a method for casting low-temperature epoxy materials thereon. Background Technology

[0002] Given the increasing demands on ships for clean energy utilization, traditional ships need to convert from a single energy source to simultaneously utilize LNG fuel. This necessitates comprehensive modifications to the fuel tanks within existing ships. The structural design of fuel tanks in the current shipbuilding industry must consider multiple factors to ensure safety and reliability.

[0003] As is well known, ships sailing at sea are susceptible to wind and waves, which places high demands on the safety and reliability of modified fuel tanks. Furthermore, due to the low-temperature characteristics of the fuel inside the fuel tank, it is necessary to isolate the low temperature from the ship's hull structure. Summary of the Invention

[0004] The purpose of this invention is to provide a method for installing pressure-bearing timber in LNG fuel tanks and casting cryogenic epoxy materials, which has high reliability in construction process and good construction quality and stability of cryogenic epoxy materials.

[0005] To solve the above-mentioned technical problems, the embodiments of the present invention provide an installation method for pressure-bearing timber in LNG fuel tanks and a method for casting low-temperature epoxy materials thereon, which includes a shore foundation construction step and a hull interior construction step. The shore foundation construction step includes the installation of vertical support pressure-bearing timber and a low-temperature epoxy material coating process.

[0006] The construction steps inside the hull include the epoxy casting process for vertical supports, the installation of anti-roll support pressure timber and its low-temperature epoxy casting process, the installation of longitudinal limiting support pressure timber and its low-temperature epoxy casting process, and the installation of anti-buoyancy support pressure timber and its low-temperature epoxy casting process.

[0007] A reasonable construction sequence is beneficial to improving the efficiency of load-bearing timber installation and low-temperature epoxy material application. The introduction of a temperature control step in the foundation construction process greatly improves the construction quality of this invention in harsh environments. Furthermore, the temperature control step utilizes the internal space of the shed to reduce the negative impact of the external environment on the load-bearing timber installation and low-temperature epoxy material application. These negative impacts are mainly reflected in the following aspects:

[0008] Firstly, the construction of low-temperature epoxy materials needs to be carried out under preset temperature and humidity conditions, and the emergence of the shed allows for the dynamic adjustment of temperature and humidity within the space using the control equipment inside the shed.

[0009] Secondly, the shed body can block the direct sunlight of the pressure wood and the low-temperature epoxy material, and avoid the performance decline of the low-temperature epoxy material caused by the direct sunlight.

[0010] In the process of the ship body interior construction, the step of adjusting the levelness can adjust the inclination (and then adjust the levelness of the fuel tank) by using the stainless steel pad, so as to compensate the error and also consider the constraint of the fuel tank left and right sliding, because the surface of the stainless steel pad provides corresponding friction to achieve the purpose.

[0011] The LNG fuel tank pressure wood installation and low-temperature epoxy material pouring method provided by the application comprises the following steps:

[0012] Before the pressure wood is installed, the rust spots, welding slag and oil stains on the inner surface of the inner bottom support baffle are removed, and after cleaning, anti-rust paint is applied;

[0013] The flatness, levelness and installation accuracy of the support baffle of each vertical support at the bottom of the fuel tank are detected;

[0014] After the pressure wood is lifted into position by using the lifting tool trolley, the pressure wood is installed by applying low-temperature epoxy material, and the pressure wood and the fuel tank support are fixed firmly by using the bolts coated with butter through the M20mm threaded holes pre-opened on the pressure wood and the φ22mm holes pre-opened on the left and right flat steels of the fuel tank support;

[0015] After all the pressure woods of the fuel tank are installed in position, the flatness and levelness accuracy data of the lower surface of the pressure wood are measured according to the preset requirements, and the data are recorded as the reference for the fuel tank hoisting positioning;

[0016] After the installation and measurement of all the pressure woods are completed, the outer surface is covered with plastic film, and the fuel tank is prepared for hoisting.

[0017] The LNG fuel tank pressure wood installation and low-temperature epoxy material pouring method provided by the application comprises the following steps:

[0018] Before the fuel tank is hoisted and positioned, the rust spots, welding slag and oil stains on the inner surface of the inner bottom support baffle are removed, and after cleaning, an anti-rust paint layer is applied, and the paint film thickness is not more than 30um;

[0019] A stainless steel plate installation positioning line is drawn on the inner side of the inner bottom support baffle;

[0020] The bolt is screwed to the approximate installation height of the stainless steel pad through the threaded holes pre-opened on the inner bottom support plate, and the distance from the inner surface of the support plate bottom is 15mm;

[0021] Put the stainless steel pad on the pre-tightened support base bolt, and position the stainless steel pad by adjusting the height of the bolt so that it is flush with the upper surface and the coaming;

[0022] After the fuel tank is hoisted and positioned, the bolts on both sides of the fuel tank support baffle for fixing the pressure wood are removed, so that the pressure wood is firmly attached to the stainless steel pad; if the stainless steel pad is not firmly attached, the bolts on the support base are adjusted to make it firmly attached to the pressure wood;

[0023] Grease is applied to the stainless steel pad, and the cleaning work is carried out after the epoxy is cured;

[0024] The air holes near the four corners of the stainless steel pad are sealed with sealing putty to prevent the epoxy resin from overflowing, and the gap between the stainless steel pad and the support baffle is also sealed with epoxy resin;

[0025] The epoxy resin is poured through the pouring hole pre-opened on the support base, and the pouring of the epoxy resin is observed through the air holes at the four corners of the stainless steel pad until the epoxy resin overflows from the air holes of the stainless steel pad, and the pouring port ball valve is closed;

[0026] After the epoxy resin is poured, a pipe is inserted into one of the air holes to supplement the epoxy resin, so that the inside of the support is completely filled with epoxy liquid;

[0027] During the curing period of the epoxy resin, the epoxy resin seal cannot be damaged, and the pouring port ball valve cannot be opened;

[0028] After the epoxy is completely cured, the sealing putty on the stainless steel pad is removed, and the jacking bolts under the support base are removed, the jacking bolt hole is filled with epoxy cement, and the pouring port ball valve is reserved.

[0029] The LNG fuel tank pressure wood installation and low-temperature epoxy material pouring method provided by the present application, the anti-rolling support pressure wood is installed after the fuel tank is hoisted and positioned, the stainless steel angle baffle on one side of the fuel tank support is scattered after the pressure wood is installed and positioned, and the low-temperature epoxy resin is poured after the silicone seal is fixed by bolts, and the installation of the anti-rolling support pressure wood and the pouring process of the low-temperature epoxy material include:

[0030] Before the fuel tank is hoisted, the rust spots, welding slag and oil stains on the inner surface of the support are cleaned according to the requirements of the low-temperature epoxy resin supplier, and after the cleaning is completed, anti-rust paint is brushed, and the paint film thickness is not more than 30um;

[0031] The pressure wood is placed near the corresponding inner bottom support before the fuel tank is hoisted;

[0032] After the fuel tank hoisting and positioning tooling is completed, the corresponding pressure wood is put into the support, and the pressure wood is pushed to a general position by the bolts coated with butter through the pre-opened tapping thread hole in the web plate of the fuel tank support;

[0033] Insert the stainless steel plate into the 2mm gap to ensure the gap between the inner bottom support web and the bearing wood;

[0034] Twist the bolt again to push the bearing wood, so that the bearing wood is firmly attached to the inserted stainless steel plate, and the theoretical thickness of the cast low-temperature epoxy resin is 30mm;

[0035] After the bearing wood is installed in place, the gap between the bearing wood and the support baffle is sealed, and after the sealing is completed, the low-temperature epoxy resin is poured.

[0036] The LNG fuel tank bearing wood installation and low-temperature epoxy material pouring method provided by the application comprises the following steps for installing the anti-rolling support bearing wood:

[0037] Before the fuel tank is hoisted, the inner surface of the support is cleaned according to the requirements of the epoxy supplier, and after the cleaning work is completed, a layer of anti-rust paint is applied, and the paint film thickness is not more than 30um;

[0038] The bearing wood is placed in the corresponding inner bottom support before the fuel tank is hoisted;

[0039] After the fuel tank hoisting and positioning work is completed, the corresponding bearing wood is placed in the support, and the bearing wood is pushed to the approximate position by the M20X75 bolt coated with butter through the pre-opened tapping thread hole in the fuel tank support web;

[0040] Insert the 2mm gap stainless steel plate, in order to ensure that the epoxy can be smoothly removed after curing, butter and crescent holes need to be applied on the surface of the stainless steel plate to ensure the gap between the inner bottom support web and the bearing wood;

[0041] Twist the bolt again to push the bearing wood, so that the bearing wood is firmly attached to the inserted stainless steel plate, and the theoretical thickness of the cast epoxy is 30mm;

[0042] After the bearing wood is installed in place, the gap between the bearing wood and the support baffle is sealed, and after the sealing work is completed, the epoxy is poured.

[0043] The LNG fuel tank bearing wood installation and low-temperature epoxy material pouring method provided by the application comprises the following steps for installing the anti-rolling support bearing wood:

[0044] Check whether all the bearing woods are installed in place;

[0045] The gap between the bearing wood and the baffle is sealed by using yellow sponge special surrounding strip and transparent silicone;

[0046] When the space is relatively small, the aforementioned step can be sealed by pushing the hard polyethylene square strip from the side of the support;

[0047] Pouring epoxy resin through the pouring hole pre-opened on the support web until the epoxy resin overflows from the gap between the support top baffle and the sealing material;

[0048] Cleaning the epoxy resin overflowing from the gap above the support;

[0049] During the curing period of the epoxy resin, the epoxy seal cannot be damaged, and the pouring port ball valve cannot be opened;

[0050] After the epoxy is completely cured, the 2mm thick stainless steel plate used for positioning is pulled out, and the sealing material between the support baffle and the bearing wood is removed;

[0051] The pouring port ball valve and the bearing wood jacking bolt are not removed, and the jacking bolt needs to be tightened after the epoxy is cured (this is to ensure good stress between the bearing wood and the epoxy resin).

[0052] The LNG fuel tank bearing wood installation and low-temperature epoxy material pouring method provided by the present application, the installation of the anti-floating support bearing wood is carried out after the positioning and welding of the total section is completed, and the installation of the anti-floating support bearing wood and the pouring process of the low-temperature epoxy material comprise:

[0053] Before the fuel tank is hoisted, the rust spots, welding slag and oil stains on the inner surface of the anti-floating device baffle are removed, and after cleaning, anti-rust paint is brushed, and the paint film thickness is not more than 30um;

[0054] After the positioning and welding work of the total section is completed, the installation position of the bearing wood is adjusted, the bearing wood is jacked to the theoretical thickness of 15mm of the low-temperature epoxy resin through the tapping thread hole pre-opened on the bottom plate of the anti-floating support of the fuel tank, and the bearing wood is jacked to the theoretical thickness of 15mm of the low-temperature epoxy resin through the tapping thread hole pre-opened on the bottom plate of the anti-floating support of the fuel tank.

[0055] After all the bearing woods are installed in place, the levelness of the upper surface of the bearing wood is measured to ensure that the levelness between them is ≤4mm;

[0056] The pouring process of the low-temperature epoxy material of the anti-floating support bearing wood comprises:

[0057] Check whether the bearing wood is installed in place, adjust the bearing wood that is not in place through the jacking bolt on the support bottom plate, and measure the levelness of the upper surface of the bearing wood to ensure that the levelness between them is ≤4mm;

[0058] The gap between the bearing wood and the baffle is sealed with yellow sponge special surrounding strip and transparent silicone, and a pouring port and a gas vent are opened on the sealing sponge at one end of the anti-floating support without baffle;

[0059] Pouring epoxy resin through the pouring port pre-opened on the sealing sponge at one end of the anti-floating support without baffle until the epoxy resin overflows from the gas vent pre-reserved on the sealing sponge;

[0060] Clearing overflowed epoxy resin;

[0061] Epoxy seal cannot be damaged during epoxy curing period;

[0062] After the epoxy is completely cured, the sealing material between the anti-floating support baffle and the bearing timber is removed;

[0063] The bearing timber jacking positioning bolt is not removed;

[0064] After all the epoxy resin pouring is completed and after it is completely cured, all the sponge surrounding strips on the support are removed and cleaned, and epoxy putty is used for filling.

[0065] In the LNG fuel tank bearing timber installation and low-temperature epoxy material pouring method provided by the application, the bowl-shaped seats of the lifting tool trolley are distributed in two rows and two columns on the surface of the lifting tool trolley, the lifting tool trolley has two vertical adjustment rails and two horizontal adjustment rails located between the vertical adjustment rails, the bottom of the bowl-shaped seat is provided with sliding feet matched with the vertical adjustment rails and the horizontal adjustment rails, the bowl-shaped seat has locking bolts distributed at the bottom of the bowl-shaped seat, the locking bolts are provided with rubber sleeves at the bottom of the bowl-shaped seat, the inner wall of the bowl of the bowl-shaped seat is provided with an annular horizontal line, whether the upper surface of the liquid coincides with the annular horizontal line is observed after the liquid is put into the bowl of the bowl-shaped seat, so as to determine whether the lifting tool trolley is in a horizontal state, the horizontal adjustment rails are provided with a plurality of high-pressure gas holes arranged in a regular manner, and the high-pressure gas holes are connected to a purge gas source.

[0066] In the step of epoxy pouring of the vertical support bearing timber, a dynamic release device is arranged at the air vent hole in the four corners of the stainless steel pad plate.

[0067] In the LNG fuel tank bearing timber installation and low-temperature epoxy material pouring method provided by the application, the low-temperature epoxy resin adopts JM-98L, first, the B component of the JM-98L epoxy putty is poured into the A component, and the material is beaten by using a defoaming type stirrer at a low speed and uniformly, so that the colors of the A and B components are uniform and there is no color difference.

[0068] Then, after the stirring is completed, the glue liquid is left still for a few minutes to make the bubbles in the glue liquid escape;

[0069] Finally, the stirred glue liquid is poured into the pump input hopper, and the pouring pump is started to pump the mixed glue liquid into the pouring area until the glue liquid overflows from the air vent.

[0070] In the LNG fuel tank bearing timber installation and low-temperature epoxy material pouring method provided by the application, the shore-based construction step includes a temperature control system, and the temperature control system includes:

[0071] A heat preservation greenhouse is installed in the epoxy material construction area;

[0072] A temperature control system arranged in an epoxy material construction area, comprising at least one temperature sensor, at least one heating fan and a control module, the temperature sensor and the heating fan are connected to the control module;

[0073] When the temperature sensor detects a temperature less than 13℃, the control module controls the heating fan to work, and when the temperature sensor detects a temperature greater than 35℃, the control module controls the heating fan to stop working.

[0074] In the LNG fuel tank pressure wood installation and low temperature epoxy material pouring method provided by the application, the heating fan is installed at the air sweeping mechanism, the air sweeping mechanism has a base with a U-shaped cross section, a mounting table is arranged in the base, a bearing is installed at the mounting table, a vertical shaft is installed at the bearing, a shaft gear is arranged on the vertical shaft, the shaft gear is driven by a motor, a disc is arranged at the top of the vertical shaft, a plurality of semispherical recesses are arranged at the top of the base in a circumferential direction at equal intervals, a ball is arranged in each recess, and the lower side of the disc is matched with the ball;

[0075] The disc and the vertical shaft are connected through a plurality of connecting pieces, and each connecting piece has:

[0076] A first rod piece is arranged at the lower side of the disc, and a plurality of obliquely arranged limiting bodies are arranged at the bottom of the first rod piece in a circumferential direction;

[0077] A first plate piece is arranged at the top of the vertical shaft, and a first plate piece through hole is arranged on the first plate piece;

[0078] After the first rod piece and the obliquely arranged limiting bodies pass through the first plate piece through hole, the obliquely arranged limiting bodies are unfolded to limit;

[0079] The vertical shaft is provided with a planar structure on one side, and a structural gap is arranged in the middle of the disc.

[0080] In the LNG fuel tank pressure wood installation and low temperature epoxy material pouring method provided by the application, an outer convex ring and an inner convex ring are arranged at the top of the base respectively, the top heights of the outer convex ring and the inner convex ring are the same, and the top height of the outer convex ring is less than the top height of the ball, a top convex ring is arranged at the outer periphery of the bottom of the disc, the top convex ring is matched with the outer convex ring, a left side air hole is arranged on the left side of the top convex ring, the inlet of the left side air hole faces the left rear, and a right side air hole is arranged on the right side of the top convex ring, and the inlet of the right side air hole faces the right rear.

[0081] The method provided by the application has the characteristics of reliable construction process and good quality of low temperature epoxy material pouring. BRIEF DESCRIPTION OF DRAWINGS

[0082] Figure 1 It is a structural schematic diagram of a B-type fuel tank in the first embodiment of the application, which is located in a ship body cargo tank.

[0083] Figure 2 It is a layout diagram of a LNG fuel tank bottom support in the first embodiment of the application.

[0084] Figure 3 LNG fuel tank top support arrangement diagram in the first embodiment of the present application.

[0085] Figure 4 Effect diagram of pressure wood installation and lifting trolley pushing pressure wood to fuel tank support in the first embodiment of the present application.

[0086] Figure 5 Anti-rolling support structure schematic diagram in the first embodiment of the present application.

[0087] Figure 6 HY1 enlarged view in the first embodiment of the present application. Figure 5

[0088] Figure 7 HY2 enlarged view in the first embodiment of the present application. Figure 5

[0089] Figure 8 HY3 enlarged view in the first embodiment of the present application. Figure 5

[0090] Figure 9 Local sealing construction schematic diagram at anti-rolling support in the first embodiment of the present application.

[0091] Figure 10 Vertical support structure schematic diagram in the first embodiment of the present application.

[0092] Figure 11 Local enlarged view at pressure wood and stainless steel plate in vertical support.

[0093] Figure 12 Local enlarged view at pressure wood and ship support in vertical support.

[0094] Figure 13 Epoxy pouring schematic diagram of vertical support in the first embodiment of the present application.

[0095] Figure 14 Epoxy pouring schematic diagram of anti-rolling and longitudinal limiting support in the first embodiment of the present application.

[0096] Figure 15 P structure schematic diagram in the first embodiment of the present application. Figure 14

[0097] Structure schematic diagram of longitudinal limiting support in the first embodiment of the present application. Figure 16

[0098] Structure schematic diagram of floating support in the first embodiment of the present application. Figure 17 ​​​​

[0099] Figure 18 for Figure 17 Enlarged view of a portion of the ZF region.

[0100] Figure 19 This is a flowchart illustrating the installation of pressure-bearing timber in the LNG fuel tank and the method for casting cryogenic epoxy material in the first embodiment of the present invention.

[0101] Figure 20 This is a partial structural diagram of the fuel tank support portion of the vertical support and the pressure timber in the shore foundation construction state according to the second embodiment of the present invention.

[0102] Figure 21 This is a cross-sectional view of the fit between the fuel tank support portion of the vertical support and the bolt holes of the pressure timber in the second embodiment of the present invention.

[0103] Figure 22 This is a schematic diagram of the dynamic release device at the four corner vent holes of the stainless steel pad in the step of vertical support pressure-bearing wood epoxy casting in the third embodiment of the present invention.

[0104] Figure 23 This is an enlarged view of the dynamic release device in the third embodiment of the present invention.

[0105] Figure 24 This is a schematic diagram of a lifting tooling trolley in the fourth embodiment of the present invention.

[0106] Figure 25 This is a three-dimensional schematic diagram of a temperature control device for epoxy material construction, taken from the first direction.

[0107] Figure 26 This is a three-dimensional schematic diagram of a temperature control device for epoxy material construction from the second direction.

[0108] Figure 27 This is a sectional view of the air sweeping mechanism.

[0109] Figure 28 for Figure 27 Enlarged view at point P1.

[0110] Figure 29 for Figure 27 Enlarged view at P2.

[0111] Figure 30 This is a top view along the vertical axis.

[0112] Figure 31 This is a top-down example of a sweeping mechanism.

[0113] Figure 32 for Figure 31 Enlarged view at P3.

[0114] Figure 33 for Figure 31Enlarged view at P4.

[0115] Reference numerals:

[0116] 1, lifting tool trolley; 2, pressure bearing wood; 3, bowl type seat; 4, backing plate; 5, vertical support fuel tank support part; 6, low temperature epoxy resin; GAP, stainless steel plate insertion gap; 7, baffle (also known as coaming); 8, inner bottom support web; 9, stainless steel plate; 10 pressure relief hole; 11, sealing body; 12, vertical support inner bottom support part of the ship; 13, stainless steel backing plate; 14, loose sleeve; 15, ball valve; 16, hose; 17, anti-rolling support inner bottom plate part; 18, anti-rolling support fuel tank support part; 19, overflow bin; 20, bolt; 21, dynamic release device.

[0117] 200 fuel tank, 201 heat preservation shed, 201a stand, 201b top cover, 201c side wall, 202 temperature sensor, 203 heating fan, 204 control module, 205 table top, 206 sweeping fan mechanism, 206a base, 206b mounting table, 206c bearing, 206d vertical shaft, 206e shaft gear, 206f disc, 206g ball, 206h outer convex ring, 206i inner convex ring, 206j first rod, 206k obliquely arranged limiting body, 206l first plate, 206m top convex ring, 206n left side air hole, 206o right side air hole, 206p planar structure, 206q structure gap. DETAILED DESCRIPTION

[0118] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application will be further described below in combination with specific embodiments.

[0119] The first embodiment of the present application provides a LNG fuel tank pressure bearing wood installation and a low temperature epoxy material pouring method. The method has a shore-based construction step and a ship cabin internal construction step. The shore-based construction step is performed on the ground near the dock, for example. The ground needs to be leveled, and a gantry crane or other equipment can be used to lift the LNG fuel tank (the LNG fuel tank can be placed on the ground by a supporting device, such as a support). The ship cabin internal construction step is performed inside the LNG fuel tank installation cabin body (i.e., inside the ship body). After scientifically distributing the construction steps, the use of the site will also be more reasonable, avoiding factors such as narrow site space that restrict the efficiency of construction. The fuel tank is loaded by the corresponding support and pressure bearing wood and isolates low temperature conduction to the ship body structure.

[0120] Reference Figure 19The figure gives a process flow diagram of the present application, from which it can be seen that the process flow of the present application includes the construction steps of the fuel tank support part of the vertical support and the pressure-bearing wood of the vertical support, the construction steps of the anti-rolling support, the longitudinal limiting support and the pressure-bearing wood, the construction steps of the inner bottom support part of the vertical support and the pressure-bearing wood of the vertical support, and the construction steps of the anti-floating support and the pressure-bearing wood. The construction process of the fuel tank support part of the vertical support and the pressure-bearing wood is completed on the shore base, and the subsequent processes are completed inside the ship cabin. The subsequent process part flow can cross operation or replace each other in sequence, for example, the construction steps of the anti-rolling support, the longitudinal limiting support and the pressure-bearing wood, and the construction steps of the inner bottom support part of the vertical support and the pressure-bearing wood of the vertical support. It should be noted that the present construction process can also effectively meet the LNG fuel tank modification requirements of existing cargo ships.

[0121] The present application is Figure 1 The B-type fuel tank M shown in the figure is taken as an example for illustration. The B-type fuel tank does not constitute a part of the ship structure, which is supported by the vertical support in the cargo hold area, and the relative displacement between the fuel tank and the ship structure is limited by the anti-rolling support and the longitudinal limiting support, and in order to prevent the fuel tank from floating up and causing damage to the ship structure when the ship structure is damaged and the cargo hold area is flooded, the anti-floating support is arranged at the lower part of the fuel tank top inclined plate. The pressure-bearing wood of each type of support of the LNG fuel tank is made of German beech laminated wood. The beech support point wood block can withstand an ambient temperature of 45 degrees Celsius in the (cargo hold) environment and a minimum temperature of-163 degrees Celsius when loading cargo in the (fuel tank). As an option, the present case selects the Laurus Industrial Products Sales (Shanghai) Co., Ltd. The low-temperature epoxy material used is EPOCAST 36-P low-temperature epoxy casting material of Wujiang Engineering Polymerization Co., Ltd. The low-temperature epoxy material has two components A and B, which are mixed and used after use, for example, 20 kg of component A and 2.4 kg of component B, and the mixed low-temperature epoxy material is 22.4 kg. When construction is carried out in low-temperature environments such as winter, for example, when the ambient temperature is lower than 13℃, the epoxy putty component A needs to be warmed up (40 degrees Celsius for 24 hours). The low-temperature epoxy material has extremely excellent pressure-bearing and adhesive properties under low-temperature conditions, which can ensure that the force of the LNG fuel tank support seat is evenly distributed.

[0122] As can be seen from Figure 2 The LNG fuel tank bottom support is arranged in a regular arrangement in the transverse and longitudinal directions, and the Figure 2If the left-right direction is defined as the transverse direction and the up-down direction is defined as the longitudinal direction, the two ends of the first row (transverse direction) are provided with first LNG fuel tank bottom supports VSA-1, and four second LNG fuel tank bottom supports VSA-2 are arranged between the two first LNG fuel tank bottom supports VSA-1, and the second row is arranged with six third LNG fuel tank bottom supports VSB, and the LNG fuel tank bottom supports of the last first row are arranged in the same way as the first row, and the LNG fuel tank bottom supports of the last second row are arranged in the same way as the second row, the vertical supports have a vertical supporting effect on the fuel tank, and the vertical supports are composed of LNG fuel tank bottom supports and corresponding ship body supports, and the installation between the pressure-bearing wood and the LNG fuel tank bottom support and the epoxy pouring (coating) operation need to be completed in the steps of the shore-based construction, so as to realize the relative fixation of the pressure-bearing wood between the LNG fuel tank bottom supports, and the process is described in detail below, and the vertical support pressure-bearing wood installation and the epoxy pouring method are as follows:

[0123] The vertical support (LNG fuel tank bottom support part) pressure-bearing wood is installed before the insulation laying of the LNG fuel tank is completed and the fuel tank is hoisted, which includes the following steps:

[0124] 1. Before the pressure-bearing wood is installed, the rust spots, welding slag and oil stains on the inner surface of the LNG fuel tank support baffle need to be removed, and after cleaning, a layer of anti-rust paint is applied.

[0125] 2. The flatness, levelness of each vertical support at the bottom of the LNG fuel tank, and the installation accuracy of the support baffle are detected, and the data must meet the requirements of the relevant accuracy files of the accuracy management.

[0126] 3. After the pressure-bearing wood 2 is lifted into place by using the lifting tool trolley 1, see Figure 4 , the bowl-shaped seat 3 of the lifting tool trolley 1 (including but not limited to a scissors car) is provided with a pad 4, and the pressure-bearing wood 2 is placed on the pad 4, which can effectively distribute the pressure of the pressure-bearing wood to the four bowl-shaped seats. The upper surface of the pressure-bearing wood is coated with PHILLYMASTIC TG-7B low-temperature epoxy material for upward top loading (until the state shown in Figure 4 ), and the pressure-bearing wood and the fuel tank support part 5 of the vertical support are fixed firmly by using a bolt coated with butter in the M20mm threaded hole pre-opened on the pressure-bearing wood 2 and the φ22mm hole opened on the left and right flat steel of the fuel tank support. After coating the upper surface of the pressure-bearing wood with low-temperature epoxy material, the step of using a vibration plate to re-press is used, which can effectively remove the bubbles, voids and other problems in the low-temperature epoxy material, and improve the density of the low-temperature epoxy material.

[0127] 4. After all the LNG fuel tank pressure wood is installed, the lower surface of the pressure wood is measured for flatness and levelness accuracy according to the preset requirements, and the data is recorded as a reference for fuel tank hoisting and positioning. The pressure wood that does not meet the installation accuracy is adjusted until it meets the accuracy requirements. It should be noted that after the LNG fuel tank is placed in the ship cabin, the pressure wood is placed on the stainless steel pad as shown in Figure 10 , and low-temperature epoxy resin will be poured under the stainless steel pad 13. At this time, the thickness of the low-temperature epoxy resin is selected according to the corresponding error to meet the preset requirements of the pressure wood installation accuracy.

[0128] 5. After all the pressure wood installation measurements are completed, the outer surface is covered with plastic film, and the fuel tank is ready for hoisting. The above process belongs to the category of shore-based construction, which can be carried out on the ground near the dock.

[0129] The above process is completed on the ground near the dock. Since the size of the LNG fuel tank is usually large, shore-based construction can avoid the constraints of the cabin space on the installation of the pressure wood. The temperature requirement for shore-based construction of low-temperature epoxy material is relatively strict, and the temperature control step is also included in the process of shore-based construction. At this time, a detachable temperature control shed is arranged on the shore-based construction site of the LNG fuel tank, which is equipped with temperature sensors and temperature control equipment. When the temperature inside the detachable temperature control shed is lower than the preset value, the temperature control equipment is started to adjust the temperature inside the detachable temperature control shed to reach the preset construction temperature value. It is worth mentioning that the use of the temperature control shed can avoid the direct exposure of the low-temperature epoxy material to the sun.

[0130] After the LNG fuel tank completes the shore-based construction, it is hoisted into the cabin by hoisting equipment. The distribution position of the anti-rolling support is shown in Figure 2 and Figure 3 , in Figure 2 , the first anti-rolling support LRS is distributed with six, and in Figure 3 , the second anti-rolling support URS is distributed with six. Referring to Figure 5 , the anti-rolling support pressure wood is installed after the fuel tank hoisting and positioning is completed. The anti-rolling support is designed to limit the relative movement between the LNG fuel tank and the ship body when the ship body rolls laterally. This structure limits the lateral displacement of the liquid fuel tank, but cannot constrain the movement of the fuel tank in other directions. The anti-rolling support pressure wood is installed after the fuel tank hoisting and positioning is completed. The stainless steel angle steel baffle on one side of the fuel tank support is scattered after the pressure wood is installed and positioned, and the low-temperature epoxy resin is poured after the silicone seal is fixed by bolts. It includes the following steps:

[0131] 1. Before hoisting the fuel tank, clean the rust, welding slag and oil stains on the inner surface of the support according to the requirements of the low-temperature epoxy resin supplier. After cleaning, apply anti-rust paint, and the paint film thickness should not exceed 30um, preferably 15um.

[0132] 2. For the convenience of construction, the pressure wood is placed in the corresponding inner bottom support (in the cabin) near the fuel tank before hoisting.

[0133] 3. After the fuel tank hoisting and positioning work is completed, the corresponding pressure wood is put into the support (i.e. Figure 5 The ship's inner bottom plate part 17 of the anti-rolling support, the fuel tank support part 18 of the anti-rolling support, the three-sided baffle on the side of the pressure wood where the anti-rolling support is installed, and the metal baffle on the side where the pressure wood is pushed in are arranged, and after the pressure wood is pushed into place, the gap is sealed with a surrounding strip to realize the pouring of low-temperature epoxy material, Figure 9 A local effect diagram of sealing the low-temperature epoxy pouring gap with a surrounding strip is given, and considering the overflow problem, two overflow bins 19 are distributed at the outlet position of the pouring gap, and the pressure wood is pushed to the general position by M20X75 bolts coated with butter through the tapping thread holes pre-opened on the fuel tank support web, i.e. Figure 5 The state is shown in the figure.

[0134] 4. A 2mm gap stainless steel plate (i.e. Figure 8 The stainless steel plate is inserted into the gap GAP, which is not shown in the figure, and the stainless steel plate 9 is shown in Figure 9 , to ensure the gap between the inner bottom support web and the pressure wood. It should be noted that in order to ensure that the epoxy can be easily removed after curing, butter can be applied to the surface of the stainless steel plate and a crescent hole can be opened. The stainless steel plate can be a 1.5m long and 20cm wide stainless steel plate. The long strip-shaped stainless steel plate needs to be removed from the gap between the inner bottom support web and the pressure wood after the construction is completed.

[0135] 5. Referring to Figures 6-8 , the bolt is twisted again to push the pressure wood, so that the pressure wood is firmly attached to the inserted stainless steel plate, and the theoretical thickness of the poured low-temperature epoxy resin is ensured to be 30mm. Figure 6 The dimension 20mm in , 7 is the thickness of the low-temperature epoxy material between the baffle and the pressure wood, and the dimension 30mm is the thickness of the low-temperature epoxy material between the pressure wood and the corresponding support, Figure 7 The height of the baffle in is 100mm.

[0136] 6. After the pressure wood is installed in place, the gap between it and the support baffle is sealed with a sealing strip. After the sealing is completed, the low-temperature epoxy resin is poured. Referring to Figure 9, the figure is the state of the pressure wood and the support of the baffle 7 sealed by the sealing body 11 (here the sealing body is first filled with a flexible foam strip or a flexible strip at the gap and then treated by glue), a protective layer is laid on the surface of the pressure wood, and two pressure release holes 10 are opened on the protective layer on the surface of the pressure wood after the sealing of the sealing body, which are located at both ends of the baffle. On the one hand, it is convenient for the support and the gap between the pressure wood to pour low-temperature epoxy material, and on the other hand, it can also be used to observe whether the low-temperature epoxy material is sufficient. More importantly, in the case of subsequent low-temperature epoxy material shrinkage, the low-temperature epoxy material can be injected from the two pressure release holes respectively to avoid the problem that the internal gap is too small to pour the low-temperature epoxy material when supplementing the injection of the low-temperature epoxy material. In addition, the pressure release hole also has the function of heat dissipation outward, so that the heat released during the solidification process of the low-temperature epoxy material can be released in time. The outlet position of the pressure release hole has an overflow bin 19 composed of a flexible foam strip. The low-temperature epoxy material can flow from the inner cavity of the overflow bin 19 to the gap between the pressure wood and the support through the pressure release hole. The curing of the low-temperature epoxy resin starts from the center area of the pressure wood, and there is a certain shrinkage in this process. The excess part in the overflow bin will be used for liquid supplement. For the pressure wood with larger size, the epoxy resin must be supplemented to the pressure release hole, so it should be closely observed during the deposition and solidification process of the epoxy resin. It should be noted that the heating equipment can be uniformly distributed in the pouring site, and the fan can be used to disturb the site environment to avoid the occurrence of hot spots. Because the occurrence of hot spots will cause excessive heat release reaction in the initial curing process, which will affect the quality of pouring and the stability of the structure in the later stage.

[0137] The longitudinal limiting support (the structure is shown in Figure 16 ) The installation process of the pressure wood can refer to the installation process of the anti-rolling support pressure wood, which will not be described here. The longitudinal limiting support can be seen in Figure 2 , which is distributed in the first longitudinal limiting support PSA of the first row and the last row, the second longitudinal limiting support PSB of the second row and the second last row.

[0138] The steps of epoxy pouring of the vertical support pressure wood are described below, which include:

[0139] 1. Before hoisting and positioning the fuel tank, the rust spots, welding slag and oil stains on the inner surface of the inner bottom support are cleaned, and a layer of anti-rust paint is applied, with a paint film thickness of not more than 30um.

[0140] 2. Refer to Figure 10 , draw a stainless steel backing plate 13 installation positioning line on the inner side of the inner bottom support (i.e. the inner bottom support part 12 of the vertical support).

[0141] 3. Screw the M20X75 bolts (the bolts are greased) to the approximate installation height of the stainless steel pad on the bolt thread hole pre-drilled on the inner bottom support plate, 15mm from the inner surface of the support plate.

[0142] 4. Place the stainless steel pad 13 on the pre-screwed support plate bolts, and position the stainless steel pad 13 by adjusting the height of the bolts so that the upper surface of the stainless steel pad 13 is flush with the coaming, i.e. the theoretical thickness of the poured epoxy is 18mm (see Figures 10-12 ). Figure 11 Mark the thickness of the stainless steel pad 13 as 10mm, the distance between the stainless steel pad 13 and the baffle plate as 5mm, the height of the baffle plate as 75mm, and the thickness of the low-temperature epoxy material as 18mm.

[0143] 5. After the fuel tank is hoisted and positioned (i.e. hoisted from the shore-based state into the tank), remove the bolts on both sides of the fuel tank support baffle plate used to fix the bearing wood, so that the bearing wood is firmly attached to the stainless steel pad. If the stainless steel pad is not firmly attached, adjust the bolts on the support plate to firmly attach the bearing wood.

[0144] 6. Grease the stainless steel pad, and clean up after the epoxy is cured.

[0145] 7. Seal the area around the air holes on the four corners of the stainless steel pad 13 with sealing putty to prevent the epoxy from overflowing. Seal the gap between the stainless steel pad and the support baffle plate with epoxy.

[0146] 8. Pour the epoxy through the pouring hole pre-drilled on the support plate (see Figure 13 , which shows the sleeve 14 installed on the pouring hole, the ball valve 15 connected to the sleeve, and the hose 16 connected to the ball valve 15, which is connected to the low-temperature epoxy material supply system to complete the pouring operation), and observe the pouring of the epoxy through the air holes on the four corners of the stainless steel pad until the epoxy overflows from the air holes, and then close the pouring hole ball valve.

[0147] 9. After the epoxy pouring is completed, insert a tube into one of the air holes to supplement the epoxy, so that the inside of the support is completely filled with epoxy liquid.

[0148] 10. During the epoxy curing period, the epoxy seal cannot be damaged, and the pouring hole ball valve cannot be opened.

[0149] 11. After the epoxy is completely cured, remove the sealing putty on the stainless steel pad and the jacking bolts under the support plate, fill the jacking bolt holes with epoxy cement, and keep the pouring hole ball valve.

[0150] The following describes the epoxy pouring steps for the anti-rolling and longitudinal limiting support, which include:

[0151] 1. Check if all the pressure-bearing wood is installed in place.

[0152] 2. Seal the gap between the pressure-bearing wood and the baffle with yellow sponge special enclosure and transparent silicone.

[0153] 3. When the space is relatively small, hard polyethylene square bars can be used to push in from the side of the support to seal.

[0154] 4. Pour epoxy through the pouring hole pre-opened on the web of the support.

See Figures 14-15 , Figure 15 for the installation of the bushing 14 in the pouring hole, the ball valve 15 connected to the bushing, and the hose 16 connected to the ball valve

[0155] 5. Clean the epoxy that has overflowed from the gap above the support.

[0156] 6. During the curing period of the epoxy, do not damage the epoxy seal and do not open the pouring hole ball valve.

[0157] 7. After the epoxy is completely cured, remove the 2mm thick stainless steel plate used for positioning, and remove the sealing material between the baffle of the support and the pressure-bearing wood.

[0158] 8. The pouring hole ball valve and the pressure-bearing wood top push bolt are not removed, and the top push bolt needs to be tightened after the epoxy is cured (this is to ensure good stress between the pressure-bearing wood and the epoxy).

[0159] The installation of the pressure-bearing wood of the anti-floating support and its epoxy pouring is described below:

[0160] The anti-floating support is installed (see structure in Figures 17-18 , the anti-floating support FS is shown in Figure 3 with 7 pressure-bearing woods in the first and last rows on the top of the fuel tank) after the total segment hoisting positioning and welding is completed, which includes the following steps:

[0161] 1. Before hoisting the fuel tank, remove rust, welding slag and oil stains from the inner surface of the baffle of the anti-floating device, and after cleaning, apply anti-rust paint with a film thickness of not more than 30um.

[0162] 2. After the total segment hoisting positioning and welding work is completed, start adjusting the installation position of the pressure-bearing wood, and use the bolts coated with butter through the pre-opened tapping thread hole on the bottom plate of the anti-floating support of the fuel tank to lift the pressure-bearing wood to the theoretical thickness of the low-temperature epoxy resin, which is 15mm.

[0163] 3. After all the pressure-bearing wood is installed in place, measure the levelness of the upper surface of the pressure-bearing wood to ensure that the levelness between them is ≤4mm.

[0164] The epoxy pouring step of the anti-floating support includes:

[0165] 1. Check whether all pressure-bearing timbers are installed in place, and adjust the pressure-bearing timbers that are not installed in place through the jacking bolts on the support bottom plate, measure the levelness of the upper surface of the pressure-bearing timber, and ensure that the levelness between the two is ≤4mm.

[0166] 2. Seal the gap between the pressure-bearing timber and the baffle with yellow sponge special surrounding strips and transparent silicone, and open a pouring port and a ventilation port on the sealing sponge at the end of the anti-floating support without a baffle.

[0167] 3. Pour the epoxy resin through the pouring port opened on the sealing sponge at the end of the anti-floating support without a baffle until the epoxy resin overflows from the ventilation hole reserved on the sealing sponge.

[0168] 4. Remove the overflowed epoxy resin.

[0169] 5. Do not damage the epoxy seal during the curing period of the epoxy resin.

[0170] 6. Remove the sealing material between the anti-floating support baffle and the pressure-bearing timber after the epoxy resin is completely cured.

[0171] 7. The pressure-bearing timber jacking positioning bolt is reserved and not removed.

[0172] After all the epoxy resin pouring is completed and after it is completely cured, remove all the sponge surrounding strips on the support and clean them, and fill them with epoxy putty.

[0173] The installation of the pressure-bearing timber of the anti-floating support and the epoxy pouring and the installation process of the longitudinal limiting support pressure-bearing timber in the present application can also refer to the prior art. In the pouring (having the same meaning as pouring) process, there is a gap between the pressure-bearing timber and the corresponding support (baffle). In this case, the sealing strip and other materials are sealed in advance, which ensures smooth pouring construction. The sealing strip and other sealing structures can be glued for secondary sealing at the same time to improve the sealing performance, and can effectively deal with unnecessary leakage of low-temperature epoxy material. The sealing strip and other materials are usually removed after the low-temperature epoxy material is poured.

[0174] It is worth mentioning that in the method for installing the pressure-bearing timber of the LNG fuel tank and the epoxy pouring of the support structure, the low-temperature epoxy resin can be JM-98L. First, pour the B component of the JM-98L epoxy putty into the A component, and use a defoaming mixer to mix at a low speed.

[0175] Then, after the mixing is finished, let the bubbles in the glue liquid out for a few minutes.

[0176] Finally, pour the mixed adhesive into the pump inlet funnel, start the grouting pump to pump the mixed adhesive into the grouting area until adhesive overflows from the vent.

[0177] The second embodiment of the present invention provides an installation method for LNG fuel tank pressure-bearing timber and a method for casting low-temperature epoxy material thereon. The difference from the first embodiment is that, in the construction process of the fuel tank support portion of the vertical support and the pressure-bearing timber, it further includes a step of applying low-temperature epoxy material to the cavity of the fuel tank support portion 5 of the vertical support by an operator. The low-temperature epoxy material is applied according to a pre-installed thickness. Compared to directly applying the low-temperature epoxy material to the surface of the pressure-bearing timber, this method uses a bottom-brushing process on the cavity of the fuel tank support portion 5 of the vertical support. The application of the low-temperature epoxy material is done in a zigzag pattern at the bottom of the cavity. The low-temperature epoxy coating process used in this example avoids problems such as moisture loss and material failure due to sunlight exposure during direct coating on the pressure timber surface. The bottom-brushing process utilizes the relatively stable environment of its open bottom to retain moisture in the low-temperature epoxy material and prevent sunlight exposure. Furthermore, the bottom-brushing process uses the baffle of the fuel tank support portion 5 of the vertical support as a lateral support structure for the low-temperature epoxy material. After the pressure timber enters the cavity, it can quickly compress the low-temperature epoxy material downwards along the inner side of the baffle. At this time, the baffle can act as a guide structure to push the material to the theoretical thickness of the cavity bottom (i.e.,...). Figure 20 The pressure timber above the vertical support (part 5 of the fuel tank support) is directly opposite the upper surface of the central pressure timber. After applying the low-temperature epoxy material, the pressure timber located directly below the fuel tank support part 5 of the vertical support is lifted using a lifting trolley (lifting tool trolley) to a position as shown. Figure 20 As shown, after the pressure-bearing timber is pushed into the fuel tank support portion 5 of the vertical support by the lifting trolley, different fixing bolts 20 are set on the baffle 7 of the fuel tank support portion 5 of the vertical support. Two bolts are set on the long side baffle 7 of the fuel tank support portion 5 of the vertical support, and only one bolt is set on the short side baffle 7 of the fuel tank support portion 5 of the vertical support. The pressure-bearing timber is then fixed again using the bolts.

[0178] Before lifting the pressure timber, bolts for fixing the pressure timber are installed at baffle 7, and the pressure timber needs to have corresponding bolt holes pre-drilled at the preset position using a drilling device. The construction process of the fuel tank support section of the vertical support and the pressure timber also includes a pre-installation step of the pressure timber. First, the pressure timber (also called pressure timber blocks; the dimensions of the pressure timber in each part of this invention are arranged according to preset requirements) is transported to the specific installation position using a lifting trolley. The pressure timber is pre-installed, and the final installation height of the pressure timber is adjusted based on the benchmark level. Any interference is checked, and the adjustment bolts are marked on the pressure timber at the positions of the bolt holes on the baffle (enclosure). A gap is ensured between the pressure timber and the structural enclosure; it should not be tightly fitted to avoid glue residue. The final installation positioning of the pressure timber is also marked. Then, the pressure timber is removed from the cavity of the fuel tank support section 5 of the vertical support. Adjustment bolt holes are drilled at the marked positions on the pressure timber. For example, an outer diameter of 29mm and a depth of 20-25mm are selected. Before drilling, the timber block itself needs to be checked for integrity and absence of cracks. The state of the bolts in the fixed state can be seen in [reference needed]. Figure 21 After the low-temperature epoxy material is applied and positioned, the saddle is lifted into place according to the final positioning marks on the bearing timber. If epoxy material overflows from the perimeter of the bearing timber, it indicates that the low-temperature epoxy material has filled the interior of the saddle. Adjusting bolts are then screwed into the bearing timber blocks to secure them. A jack is used to support the fixed position. The saddle is removed after the low-temperature epoxy has completely cured. During the epoxy curing process, the ambient temperature must be monitored and must not be lower than 13 degrees Celsius.

[0179] For cleaning the surface of the pressure-bearing wood, the epoxy resin casting area is cleaned with a cloth and a cleaning agent (acetone). In this invention, manually applying the low-temperature epoxy resin material is also part of the casting process. Furthermore, in each construction process step, the low-temperature epoxy resin also includes a sample collection step. In this step, a 100mm*100mm*50mm metal box (2mm thick) is used to package the low-temperature epoxy resin material for different steps. The epoxy resin is sampled on-site and preserved for subsequent testing.

[0180] The third embodiment of the present invention provides an installation method for pressure-bearing timber in an LNG fuel tank and a method for casting cryogenic epoxy material thereon. The difference between this embodiment and the first embodiment is that... (See below) Figure 22 In the process of vertical support bearing wood epoxy casting, when the four corner vent holes of stainless steel pad plate 13 are sealed with sealant, a dynamic release device 21 is installed here. When the pressure of pumping low temperature epoxy material exceeds the preset value, the dynamic release device 21 will destroy the pressure relief membrane and release the pressure to the outside through this device.

[0181] The dynamic release device has a release rod part 21a with a lower channel 21b and an intermediate chamber 21c at the upper end of the lower channel, and an upper channel above the intermediate chamber 21c, at least two layers of pressure relief membranes 21d are arranged in the intermediate chamber 21c, and the embodiment has two layers, a flared support 21e is arranged in the upper channel close to the intermediate chamber, a dynamic pressure relief rod 21f is arranged in the upper channel, the top of the dynamic pressure relief rod 21f has an operating handle 21g, the bottom of the dynamic pressure relief rod is provided with a circular block 21h at the flared support, the circular block is provided with horizontal openings 21i same as the hollow channel in the dynamic pressure relief rod, a release port is arranged at the top of the operating handle or the dynamic pressure relief rod, and the embodiment is provided with an elliptical hollow structure at the operating handle, and the release port 21j is arranged on the side of the operating handle, and the upper part of the release rod part is provided with a normally closed movable chamber 21k, a ring-shaped protrusion is arranged at the dynamic pressure relief rod 21f at the normally closed movable chamber, and a spring 21l is arranged in the normally closed movable chamber and connected to the ring-shaped protrusion at one end. Figure 23 In the state shown, the device is in a non-working state, and at this time, the pressure relief membrane is not in a working state.

[0182] When the low-temperature epoxy material starts to be pumped, the operator presses down the operating handle 21g, at this time, the inner channel of the dynamic pressure relief rod 21f is connected to the space where the low-temperature epoxy material needs to be poured through the horizontal openings of the circular block, the dynamic release device 21 is in a working state, and during the low-temperature epoxy pouring process, when the pumping pressure exceeds the preset value, the pressure relief membrane 21d will be damaged, and the low-temperature epoxy material will overflow from the release port 21j of the operating handle, and the pressure relief step is completed synchronously.

[0183] The fourth embodiment of the present application provides a LNG fuel tank pressure-bearing wood installation and a low-temperature epoxy material pouring method, which is different from the first embodiment in that the bowl-shaped seats 3 of the lifting tool trolley used in each step are arranged in two rows and two columns, as shown in Figure 24 The lifting tool trolley has two vertical adjustment rails 1a and two horizontal adjustment rails 1b between the vertical adjustment rails, the bowl-shaped seat can displace along the corresponding adjustment rail, the bottom of the bowl-shaped seat is provided with sliding feet matched with the vertical adjustment rail and the horizontal adjustment rail, and the bowl-shaped seat has locking bolts 1c distributed at the bottom of the bowl-shaped seat, the locking bolts 1c are provided with rubber sleeves at the positions penetrating through the bottom of the bowl-shaped seat (the liquid placed in the bowl-shaped seat can seal without leakage), and when the locking bolts abut against the upper surfaces of the adjustment rails, the bowl-shaped seat cannot displace, and it is worth mentioning that the inner side wall of the bowl of the bowl-shaped seat is provided with a ring-shaped horizontal line 1d, and after the liquid (for example, water) is placed in the bowl of the bowl-shaped seat, whether the upper surface of the liquid coincides with the ring-shaped horizontal line 1d is observed to determine whether the lifting tool trolley is in a horizontal state, so as to improve the precision of the pressure-bearing wood installation and the efficiency of the construction.

[0184] It should be noted that the transverse adjustment rail is provided with a plurality of high-pressure air holes 1e arranged in a regular manner, such as the two rows and two columns of high-pressure air holes shown in the figure, which are connected to a high-pressure gas source such as a high-pressure gas cylinder, and as an option, a small high-pressure gas cylinder and a corresponding control solenoid valve can be installed at the bottom of the trolley. When the pressure wood is placed on the lifting tool trolley, the lower surface of the pressure wood is continuously blown by high-pressure gas to avoid the attachment of dust and other impurities, and when the lifting tool trolley is not placed under the pressure wood, the lifting tool trolley is raised to the inner cavity of the baffle of the corresponding support, and the impurities on the bottom of the fuel tank support are blown away by high-pressure gas, and the levelness of the fuel tank can be observed by the state of the liquid in the lifting trolley. At this time, the bowl-shaped seat can be provided with a transparent material at the position of the annular horizontal line to facilitate observation. In the case of configuring the high-pressure air hole, the lifting tool trolley does not need to place a pad plate, but directly installs the pressure wood on the bowl-shaped seat, and the upper edge of the bowl-shaped seat can be provided with a wood ring with a width of 3 cm. The wood ring can cause liquid surge to overflow the bowl during the lifting and movement of the trolley, and can increase the stress surface by using the wood ring to avoid stress concentration and damage to the pressure wood.

[0185] The device provided by the embodiment can effectively improve work efficiency and simultaneously improve construction accuracy.

[0186] In the embodiment, the low-temperature epoxy material used in the shore-based construction is PHILLYMASTIC TG-7B low-temperature epoxy material (brushing) of Yigong Polymer (Wujiang) Co., Ltd., and the low-temperature epoxy material used in the ship cabin interior construction is EPOCAST 36-P low-temperature epoxy pouring material (pumping pouring) of Yigong Polymer (Wujiang) Co., Ltd.

[0187] The fifth embodiment of the present application provides a LNG fuel tank pressure wood installation and a low-temperature epoxy material pouring method, which is different from the first embodiment in that, referring to Figure 25 and Figure 26 The shore-based construction step includes a temperature control system (temperature control is performed by using the temperature control system), and the temperature control system includes a heat preservation greenhouse 201 installed in the epoxy material construction area.

[0188] The low-temperature epoxy material (epoxy material) used is PHILLYMASTIC TG-7B low-temperature epoxy material of Yigong Polymer (Wujiang) Co., Ltd.

[0189] The temperature control system is arranged in the epoxy material construction area (in the heat preservation greenhouse), and includes at least one temperature sensor 202, at least one heating fan 203, and a control module 204. The temperature sensor 202 and the heating fan 203 are both connected to the control module 204.

[0190] When the temperature sensor detects that the temperature is less than 13℃, the control module controls the heating fan to work, and when the temperature sensor detects that the temperature is greater than 35℃, the control module controls the heating fan to stop working.

[0191] The application can provide a suitable temperature environment for the fuel tank pressure bearing wood installation (cooperating with the epoxy material, the fuel tank bottom is coated with the epoxy material, and the pressure bearing wood is installed at the position where the fuel tank bottom is coated with the epoxy material) process, facilitates low-temperature environment construction, and improves construction effect.

[0192] In the embodiment, the heat preservation greenhouse 201 comprises columns 201a distributed at four corners, lateral support parts (not shown in the figure) are arranged between adjacent columns 201a, the lateral support parts and the columns constitute a support frame, the lateral support parts are designed as required, and the prior art can also be referred to, the top of the column 201a is provided with a top cover 201b, the side of the column 201a is provided with a side wall 201c, and an opening and closing door is arranged at least at one side of the side wall, which facilitates the personnel, materials and the like to enter and exit (a fuel tank and the like of large size is prepositioned in a construction area, and the heat preservation greenhouse is hoisted to the construction area after being made, so that the fuel tank and the like prepositioned in the construction area is covered in the interior), and meanwhile, the interior space is relatively airtight after being closed, so as to facilitate heat preservation. The heat preservation greenhouse covers the epoxy material construction area in the interior, facilitates heat preservation work, and reduces the influence of the external environment on the epoxy material construction area. In particular, a lifting ring (not shown in the figure, which is connected to the column after penetrating through the top cover at the bottom) can be arranged at the top of each column. The heat preservation greenhouse can be conveniently hoisted (hoisted to the epoxy material construction area or hoisted away from the epoxy material construction area) through the four lifting rings, and is beneficial to construction.

[0193] In the embodiment, the temperature sensor 202 is arranged on a desktop 205 with four legs, the top of the desktop 205 is 20-30cm away from the plane where the bottom of the fuel tank 200 is located, and the control module 204 is arranged on the desktop 205. The position where the pressure bearing wood and the fuel tank are combined has a certain height from the ground (the fuel tank is suspended through a support), the characteristics of hot air are prone to cause the temperature of the upper space to be high and the temperature of the lower space to be low, and the above design can improve the accuracy of overall space temperature measurement (especially the temperature measurement at the height of the position where the pressure bearing wood and the fuel tank are combined).

[0194] In the embodiment, two heating fans are arranged at each fuel cabin 200 (working independently of each other), and two temperature sensors are arranged. When any of the temperature sensors detects a temperature value less than 13°C, the control module controls the heating fan to work; when any of the temperature sensors detects a temperature value greater than 35°C, the control module controls the heating fan to stop working. Reasonable arrangement of the number of heating fans and temperature sensors can improve the temperature control effect. 13-35°C is the ideal temperature for epoxy material construction. When any of the temperature sensors detects a temperature value deviating from the interval, the temperature control device acts (starts working or stops working), thereby improving the system sensitivity. Arrangement of multiple temperature sensors can improve the reliability of the device.

[0195] Referring to Figures 27-33 The heating fan is installed (placed on the disc of the air sweeping mechanism) at the air sweeping mechanism 206. The air sweeping mechanism 206 has a base 206a in a U-shaped cross section. An installation table 206b is arranged in the base 206a. A bearing 206c is installed at the installation table 206b. A vertical shaft 206d is installed at the bearing 206c. A shaft gear 206e is arranged on the vertical shaft 206d. The shaft gear 206e is driven by a motor. The motor is installed at the installation table. The motor can rotate in a forward direction and a reverse direction (the forward rotation angle and the reverse rotation angle can be determined according to actual needs. The motor can refer to the prior art). A disc 206f (which can be made of stainless steel) is arranged at the top of the vertical shaft 206d. A plurality of semispherical recesses (three in the embodiment) are arranged on the top of the base 206a in a circumferential direction at equal intervals. A plurality of balls 206g made of stainless steel (correspondingly, the number of balls in the embodiment is three) are arranged in the recesses. The lower side of the disc cooperates with the balls (the outer side of the disc is supported by the balls. At the same time, the balls can move in the semispherical recesses during rotation, thereby assisting the rotation of the disc. Lubricating oil is added in the semispherical recesses as needed).

[0196] The disc 206g and the vertical shaft 206d are connected through a plurality of connecting pieces (two in the embodiment, one on the left side of the vertical shaft and one on the right side). The connecting pieces have a first rod 206j located at the lower side of the disc. A plurality of obliquely arranged limiting bodies 206k (made of stainless steel, in the form of a sheet, arranged on the bottom of the first rod in a circumferential direction at equal intervals, and the number can be three, four, five, or more) are arranged on the bottom of the first rod 206j in a circumferential direction at equal intervals. A first plate 206l is arranged at the top of the vertical shaft 206d. The first plate 206l is provided with a first plate through hole. After the first rod 206j and the obliquely arranged limiting bodies 206k pass through the first plate through hole, the obliquely arranged limiting bodies 206k are unfolded to limit. One side of the vertical shaft 206d is provided with a plane structure 206p. The middle part of the disc 206f is provided with a structure gap 206q.

[0197] Place the disc above the base, aligning the structural notch with the vertical axis (the vertical axis's planar structure faces backward, and the disc's structural notch faces backward; using the vertical projection as a reference, align the straight line at the front of the structural notch with the vertical axis's planar structure; at this point, the structural notch and the vertical axis are aligned, the first rod on the left and the first plate's through hole are aligned, and the first rod on the right and the first plate's through hole are aligned). Lower the disc, supported by the ball bearings. Insert the first rod into the corresponding (directly below) first plate's through hole. The inclined limiting body enters the first plate's through hole and folds. Pressing the central area of ​​the disc causes a certain deformation in that area, allowing the inclined limiting body to pass through the first plate's through hole (when the disc is supported by the ball bearings, the top part of the inclined limiting body is still placed inside the first plate's through hole). After passing through, unfold it, and the inclined limiting body provides a limit (at this point, the central area of ​​the disc is not under force and reset). After installation, fix the disc and the vertical axis, while simultaneously providing auxiliary limiting for the ball bearings. The fixing method of the connector avoids the adverse effects on the mounting disk caused by the free rotation of the vertical shaft, and achieves a good connection between the disk and the vertical shaft, as well as limiting the position of the ball part.

[0198] Due to the presence of the vertical plane, lubricating oil can be added through the structural opening. The lubricating oil can flow downward along the vertical plane to the bearing for lubrication (there is an oil groove on the base below the bearing, which can accumulate lubricating oil, and the accumulated lubricating oil lubricates the bearing), which is beneficial for maintenance.

[0199] The motor drives the shaft gears in both forward and reverse directions. When the motor rotates forward, it causes the disk to rotate to one side by a certain angle (towards...). Figure 31 For example, the disc rotates 90 degrees clockwise (the specific angle can be set as needed), and after reaching the desired position, the motor stops and then rotates in the opposite direction, causing the disc to rotate a certain angle towards the other side (for example, ...). Figure 31 For example, the disc can rotate 90 degrees counterclockwise (the specific angle can be set as needed), stop when it reaches the desired position, and repeat this process. This method allows the heating fan to perform air oscillation, improving the heating effect of the space (area) and enhancing the construction efficiency. It also improves the heating effect and applicability of ordinary industrial heating fans (which do not have an oscillating air oscillation function).

[0200] Unless otherwise specified, the orientations in this embodiment, such as front, back, left, and right, are indicated by the arrows in the attached drawings.

[0201] In the embodiment, the outer convex ring 206h and the inner convex ring 206i are arranged on the top of the base 206a, the top of the outer convex ring 206h and the top of the inner convex ring 206i have the same height, the top of the outer convex ring 206h is lower than the top of the ball 206g, the top convex ring 206m is arranged on the bottom of the disc 206f, the top convex ring 206m and the outer convex ring 206h are matched (the top convex ring can be inserted into the outer convex ring), the left part of the top convex ring 206m (the left half of the top convex ring) is provided with the left air hole 206n, the entrance of the left air hole 206n is directed to the left rear, and the right part of the top convex ring 206m (the right half of the top convex ring) is provided with the right air hole 206o, the entrance of the right air hole 206o is directed to the right rear.

[0202] The semispherical recess can cause the lubricating oil to overflow, the contact position between the disc and the ball can cause the lubricating oil to drip, the space between the two convex rings can prevent the lubricating oil placed on the top of the base (overflow and / or drip) from flowing out to affect the surrounding (for example, safety hazards and hazards of contaminating components). The matching of the top convex ring and the outer convex ring can reduce or avoid the entry of external foreign matters into the interior of the air sweeping mechanism from the top of the disc and the base, thereby causing adverse effects (affecting the operation of the internal structure). At the same time, the left air hole and the right air hole on the top convex ring can achieve ventilation, which is beneficial to the heat dissipation of the device (for example, the motor) in the air sweeping mechanism. When the disc rotates clockwise, the left air hole has a better air inlet effect, and when the disc rotates counterclockwise, the right air hole has a better air inlet effect, and the ventilation effect is better. Since the top convex ring is inserted into the outer convex ring, the disc can be transversely limited, thereby preventing the damage of the connecting member caused by the transverse impact. Figure 31

[0203] In particular, the top of the vertical shaft 206d is higher than the top of the base and lower than the top of the ball. This design can prevent damage caused by large deformation during the installation of the disc, and is close to the structural gap, which is convenient for alignment.

[0204] The outer diameter of the shaft gear is greater than the outer diameter of the bearing. The shaft gear can form a certain protection for the bearing.

[0205] Those skilled in the art can understand that the above-mentioned embodiments are specific embodiments for implementing the present application, and in actual application, various changes can be made in form and details without departing from the spirit and scope of the present application.​

Claims

1. LNG fuel tank pressure wood installation and its cryogenic epoxy material pouring method, which comprises the steps of shore-based construction and the steps of ship body internal construction, the ship body internal construction steps include the installation of the pressure wood of the non-floating support and the pouring process of its cryogenic epoxy material, characterized in that, The steps of the shore-based construction include installation of vertical support bearing wood and its low-temperature epoxy material coating process; The steps of the ship body internal construction further include vertical support bearing wood installation and its low-temperature epoxy material coating process, installation of anti-rolling support bearing wood and its low-temperature epoxy material coating process, installation of longitudinal limiting support bearing wood and its low-temperature epoxy material coating process; The steps of the shore-based construction and / or the steps of the ship body internal construction further include a temperature control step; The installation of the vertical support bearing wood is performed after fuel tank insulation laying and before fuel tank hoisting, and includes the following steps: Before the installation of the bearing wood, rust spots, welding slag and oil stains on the inner surface of the inner bottom support baffle are removed, and after the cleaning, anti-rust paint is applied; The flatness and levelness of each vertical support at the bottom of the fuel tank and the installation accuracy of the support baffle are detected; After the bearing wood is lifted into place by using a lifting tool trolley, the low-temperature epoxy material is coated for installation, and the bearing wood is fixed to the fuel tank support by bolts with butter applied, through the pre-opened M20 mm threaded holes on the bearing wood and the φ22 mm holes on the left and right flat steels of the fuel tank support; After the bearing wood of all fuel tanks is installed in place, the flatness and levelness of the lower surface of the bearing wood are measured according to the preset requirements, and the data are recorded as a reference for fuel tank hoisting positioning; After the installation and measurement of all bearing woods are completed, the outer surface is covered with plastic film in preparation for fuel tank hoisting; The vertical support epoxy pouring process includes: Before the fuel tank is hoisted and positioned, the rust spots, welding slag and oil stains on the inner surface of the inner bottom support baffle are removed, and after the cleaning, an anti-rust paint layer is applied, with a paint film thickness of not more than 30 um; A stainless steel plate installation positioning line is drawn on the inner side of the inner bottom support baffle; The bolts are screwed to the desired installation height of the stainless steel pad through the pre-opened threaded holes on the inner bottom support plate, with a distance of 15 mm from the inner surface of the support plate; The stainless steel pad is placed on the pre-screwed support plate bolts, and the height of the bolts is adjusted to position the stainless steel pad, so that the upper surface of the stainless steel pad is flush with the baffle; After the fuel tank hoisting and positioning are completed, the bolts used to fix the bearing wood on both sides of the fuel tank support baffle are removed, so that the bearing wood is firmly attached to the stainless steel pad. If the stainless steel pad is not firmly attached, the bolts on the support plate are adjusted to make it firmly attached to the bearing wood; The butter is applied on the stainless steel pad, and the cleaning work is performed after the epoxy is cured; The four corners of the stainless steel pad are sealed with sealing putty near the air holes to prevent epoxy resin from overflowing. The gap between the stainless steel pad and the support baffle is also sealed with epoxy resin. Through the pouring holes pre-opened on the support plate, the epoxy resin is poured, and the pouring of the epoxy resin is observed through the air holes at the four corners of the stainless steel pad until the epoxy resin overflows from the air holes, and the pouring port ball valve is closed. After the epoxy resin pouring is completed, a pipe is inserted into one of the air holes to supplement the epoxy resin, so that the support interior is completely filled with epoxy liquid. During the epoxy resin curing period, the epoxy resin seal cannot be damaged, and the pouring port ball valve cannot be opened. After the epoxy is completely cured, remove the sealing putty on the stainless steel backing plate and remove the jacking bolts under the support bottom plate, fill the jacking bolt holes with epoxy cement, and pour the ball valve; The anti-rolling support pressure wood is installed after the fuel tank is hoisted and positioned, and the stainless steel angle steel baffle on one side of the fuel tank support is scattered after the pressure wood is installed and positioned, and the low temperature epoxy resin is poured after the silicone seal is fixed with bolts; Before hoisting the fuel tank, clean the rust, welding slag and oil stains on the inner surface of the support according to the requirements of the low temperature epoxy resin supplier, and then paint the rust-proof paint, the thickness of which should not exceed 30um; The pressure wood is placed near the corresponding inner bottom support before hoisting the fuel tank; After the fuel tank hoisting positioning tool is finished, the corresponding pressure wood is put into the support, and the bolt coated with butter is used to push the pressure wood to the general position through the pre-opened tapping thread hole on the web of the fuel tank support; A stainless steel plate with a 2mm gap is inserted to ensure the gap between the inner bottom support web and the pressure wood; The bolt is twisted again to push the pressure wood, so that the pressure wood is firmly attached to the inserted stainless steel plate, and the theoretical thickness of the poured low temperature epoxy resin is 30mm; After the pressure wood is installed in place, the gap between the pressure wood and the support baffle is sealed, and then the low temperature epoxy resin is poured; The installation of the anti-rolling support pressure wood includes the following steps: Before hoisting the fuel tank, clean the inner surface of the support according to the requirements of the epoxy supplier, and then paint a layer of rust-proof paint, the thickness of which should not exceed 30um; The pressure wood is placed near the corresponding inner bottom support before hoisting the fuel tank; After the fuel tank hoisting positioning work is finished, the corresponding pressure wood is put into the support, and the M20X75 bolt coated with butter is used to push the pressure wood to the general position through the pre-opened tapping thread hole on the web of the fuel tank support; A stainless steel plate with a 2mm gap is inserted to ensure the gap between the inner bottom support web and the pressure wood; The bolt is twisted again to push the pressure wood, so that the pressure wood is firmly attached to the inserted stainless steel plate, and the theoretical thickness of the poured low temperature epoxy resin is 30mm; After the pressure wood is installed in place, the gap between the pressure wood and the support baffle is sealed, and then the low temperature epoxy resin is poured; The pouring process of the low temperature epoxy material of the anti-rolling support pressure wood and the pouring process of the low temperature epoxy material of the longitudinal limiting support pressure wood include: Check whether all the pressure woods are installed in place; Use yellow sponge special surrounding strip and transparent silicone to seal the gap between the pressure wood and the baffle; When the space is relatively narrow, a hard polyethylene square strip can be used to seal from the side of the support in the foregoing steps; Pour the epoxy resin through the pouring hole pre-opened on the web of the support until the epoxy resin overflows from the gap between the top baffle of the support and the sealing material; Clean the epoxy resin overflowing from the gap above the support; During the curing period of the epoxy resin, the epoxy seal should not be damaged, and the pouring port ball valve should not be opened; After the epoxy is completely cured, the 2mm-thick stainless steel plate used for positioning is pulled out, and the sealing material between the support stopper and the bearing wood is removed; The pouring port ball valve and the bearing wood jacking bolt are not removed, and the jacking bolt needs to be tightened after the epoxy is cured; In the step of pouring epoxy on the vertical support bearing wood, a dynamic release device is arranged at the air vent hole in the four corners of the stainless steel pad; the dynamic release device has a release rod portion, the release rod portion has a lower channel and an intermediate chamber at the upper end of the lower channel, an upper channel above the intermediate chamber is further arranged in the release rod portion, at least two pressure relief membranes are arranged in the intermediate chamber, a flared support platform is arranged in the upper channel close to the intermediate chamber, a dynamic pressure relief rod is installed in the upper channel, the top of the dynamic pressure relief rod has an operating handle, the bottom of the dynamic pressure relief rod is provided with a circular block-shaped body at the flared support platform, the circular block-shaped body is provided with a horizontal opening which is the same as the hollow channel of the dynamic pressure relief rod, a release port is arranged at the operating handle or the top of the dynamic pressure relief rod, the operating handle is arranged in an elliptical hollow structure, the release port is arranged on the side of the operating handle, and the upper part of the release rod portion is provided with a normally closed movable chamber, an annular protrusion is arranged at the dynamic pressure relief rod in the normally closed movable chamber, and a spring is arranged in the normally closed movable chamber with one end connected to the annular protrusion; The thickness of the stainless steel pad is 10mm; The shore-based construction steps include a temperature control system, and the temperature control system includes: A heat preservation greenhouse (201) is installed in the epoxy material construction area; A temperature control system is arranged in the epoxy material construction area, and includes at least one temperature sensor (202), at least one heating fan (203), and a control module (204); the temperature sensor (202) and the heating fan (203) are both connected to the control module (204); When the temperature sensor detects a temperature less than 13℃, the control module controls the heating fan to work; when the temperature sensor detects a temperature greater than 35℃, the control module controls the heating fan to stop working; The heating fan is installed at a wind sweeping mechanism (206), the wind sweeping mechanism (206) has a base (206a) with a U-shaped cross section, an installation table (206b) is arranged in the base (206a), a bearing (206c) is installed at the installation table (206b), a vertical shaft (206d) is installed at the bearing (206c), a shaft gear (206e) is arranged on the vertical shaft (206d), the shaft gear (206e) is driven by a motor, a disc (206f) is arranged at the top of the vertical shaft (206d), a plurality of semispherical recesses are arranged at the top of the base (206a) at equal intervals in the circumferential direction, a plurality of ball bearings (206g) are arranged in the recesses, and the lower side of the disc is matched with the ball bearings; The disc (206f) and the vertical shaft (206d) are connected by a plurality of connecting members, and the connecting members have: A first rod member (206j) is arranged at the lower side of the disc, and a plurality of obliquely arranged limiting bodies (206k) are arranged at the bottom of the first rod member (206j) in the circumferential direction; A first plate member (206l) is arranged at the top of the vertical shaft (206d), and a first plate member through hole is arranged on the first plate member (206l); The first rod (206j) and the obliquely arranged limiting body (206k) pass through the first plate through-hole, and the obliquely arranged limiting body (206k) is unfolded to limit; The vertical shaft (206d) is provided with a planar structure (206p) on one side, and the disc (206f) is provided with a structural gap (206q) in the middle; The top outer side and the top inner side of the base (206a) are respectively provided with an outer convex ring (206h) and an inner convex ring (206i), the top heights of the outer convex ring (206h) and the inner convex ring (206i) are the same, the top height of the outer convex ring (206h) is smaller than the top height of the ball (206g), the bottom outer periphery of the disc (206f) is provided with a top convex ring (206m), the top convex ring (206m) is matched with the outer convex ring (206h), the left side of the top convex ring (206m) is provided with a left side air hole (206n), the entrance of the left side air hole (206n) faces the left rear, and the right side of the top convex ring (206m) is provided with a right side air hole (206o), the entrance of the right side air hole (206o) faces the right rear.

2. The LNG fuel tank pressure wood installation and its cryogenic epoxy material pouring method according to claim 1, characterized in that, The bowl-shaped seat of the lifting tool trolley is distributed in two rows and two columns on the surface of the lifting tool trolley, the lifting tool trolley has two vertical adjustment rails and two horizontal adjustment rails between the vertical adjustment rails, the bottom of the bowl-shaped seat is provided with sliding legs matched with the vertical adjustment rails and the horizontal adjustment rails, the bowl-shaped seat has locking bolts distributed on the bottom of the bowl-shaped seat, the locking bolts are provided with rubber sleeves at the bottom of the bowl-shaped seat, the inner wall of the bowl-shaped seat is provided with an annular horizontal line, whether the liquid surface coincides with the annular horizontal line is observed when the liquid is put into the bowl-shaped seat to determine whether the lifting tool trolley is in a horizontal state, the horizontal adjustment rails are provided with a plurality of high-pressure air holes arranged in a regular manner, and the high-pressure air holes are connected to a blowing gas source.

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