A nuclear power unit conventional island heater towing device and method

Abstract

The application belongs to the technical field of heater towing and provides a nuclear power unit conventional island heater towing equipment and method, which comprises a main slide and an auxiliary adjusting slide; the auxiliary adjusting slide is obliquely arranged at one end of the main slide according to a preset angle; a heater pulling device is fixed at the end of the main slide away from the auxiliary adjusting slide; when the heater is towed, the heater hoisted onto the adjusting slide can be moved on the slide under the action of the heater pulling device, the towing of the heater in the scene is realized, the problems of long assembly period, high cost of shift and crane idling when the large crane is used to transfer the scene are avoided, the towing track can be fully utilized, and the construction period is ensured.

Description

Technical Field

[0001] This invention belongs to the field of heater transportation technology, and particularly relates to a device and method for transporting conventional island heaters in nuclear power units. Background Technology

[0002] The conventional island of a nuclear power unit includes multiple high-pressure heaters and multiple low-pressure heaters. The main function of the high-pressure heaters is to use the extracted steam from the turbine to heat the high-pressure feedwater entering the steam generator of the nuclear island, thereby improving the efficiency of the unit's thermodynamic cycle. The main function of the low-pressure heaters is to use the extracted steam from the main unit to heat the main condensate before it enters the deaerator, thereby improving the efficiency of the unit's thermodynamic cycle. The high-pressure heaters and low-pressure heaters are arranged in parallel in different groups at different heights, such as the 0m level and the 10m level.

[0003] The inventors discovered that when transporting and hoisting high-pressure and low-pressure heaters in the conventional island of a nuclear power unit, the traditional method is to use crawler cranes or truck cranes to directly hoist them into place. While direct placement saves time and labor, it has the following problems: the relocation and assembly cycle of large cranes is long, and the daily operating cost is high; the early or late arrival of equipment will lead to the cranes being idle; before the equipment on the 0m floor is placed, the construction of the civil structure on the 10m floor needs to be temporarily suspended, affecting the construction period; after the equipment is placed, the construction above will increase the risk of collision with the equipment, and additional protective measures for finished products need to be taken. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a method and equipment for transporting conventional island heaters in nuclear power units. This method avoids issues such as the need for large cranes to be moved, long assembly cycles, high daily operating costs, and crane idleness. Furthermore, the transport track can be fully utilized without affecting the construction schedule.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a transport device for conventional island heaters in nuclear power units, employing the following technical solution:

[0006] A transport device for conventional island heaters in a nuclear power unit includes a main slide and an auxiliary regulating slide;

[0007] The auxiliary adjustment slide is inclined at a preset angle at one end of the main slide; a heater pulling device is fixed at the end of the main slide away from the auxiliary adjustment slide.

[0008] Furthermore, an inclined slide is installed between the main slide and the auxiliary adjusting slide.

[0009] Furthermore, the length direction of the main slide is parallel to the direction of the axis where the heater is located after it has been transported and positioned.

[0010] Furthermore, the heater pulling device is a winch, and a wire rope is installed on the winch; the end of the wire rope away from the winch is connected to the heater.

[0011] Furthermore, the wire rope passes through the first pulley and the second pulley in sequence; the central axis of the first pulley is set on the center line of the main slide rail, and the central axis of the second pulley is set on the center line of the auxiliary adjustment slide rail.

[0012] Furthermore, the wire rope is a fiber core wire rope.

[0013] Furthermore, both the main slide and the auxiliary adjusting slide are laid with H-beams; below the H-beams, H-beams perpendicular to the main slide are laid at a preset position.

[0014] Furthermore, steel plates are evenly spaced at the bottom of both the main slide and the auxiliary adjusting slide.

[0015] To achieve the above objectives, in a second aspect, the present invention also provides a method for transporting conventional island heaters in nuclear power units, employing the following technical solution:

[0016] A method for transporting conventional island heaters in a nuclear power unit employs the conventional island heater transport equipment described in the first aspect, comprising: moving the heaters hoisted onto the regulating slides under the action of a heater traction device, thereby realizing the transport of the heaters within the scenario.

[0017] Furthermore, the heater is lifted using tracked slings until it is higher than the slide rail, at which point the hook is stopped; the heater is then lifted onto the slide rail.

[0018] Place the front end of the heater above the auxiliary adjustment slide;

[0019] Start the winch to pull the heater; when the heater pulls the wire rope of the crawler sling, the winch stops pulling forward;

[0020] The crawler sling is slowly lowered until the wire rope is no longer under tension, then the hanging wire rope is removed from the heater.

[0021] Start the winch and pull the heater to the inclined slide;

[0022] The rear end of the heater moves on the inclined slide, adjusting the heater on the auxiliary adjustment slide to the main slide. The winch is then started to transport the heater to the preset position.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. The auxiliary adjustment slide of the present invention is inclined at one end of the main slide at a preset angle, and the end of the main slide away from the auxiliary adjustment slide is fixed with a heater pulling device. When the heater is towed, under the action of the heater pulling device, the heater hoisted on the adjustment slide can be moved on the slide, realizing the transport of the heater within the scene. This avoids the problems of long assembly cycle, high shift cost and idle crane when using large cranes for site transfer. Moreover, the towing track can be fully utilized, ensuring the construction period.

[0025] 2. The present invention provides an inclined slide between the main slide and the auxiliary adjustment slide. When the heater on the auxiliary adjustment slide is adjusted to the main slide, the rear end of the heater can move on the inclined slide, ensuring the stability of the heater's direction adjustment during transport. Attached Figure Description

[0026] The accompanying drawings, which form part of this embodiment, are used to provide a further understanding of this embodiment. The illustrative embodiments and their descriptions are used to explain this embodiment and do not constitute an improper limitation of this embodiment.

[0027] Figure 1 This is a layout diagram of the 0m layer equipment in Embodiment 1 of the present invention;

[0028] Figure 2 This is a layout diagram of the 10m-level equipment in Embodiment 1 of the present invention;

[0029] Figure 3 This refers to the arrangement of the main slideway for transporting the high-pressure heater and low-pressure heater at the 0m layer in Embodiment 1 of the present invention.

[0030] Figure 4 This refers to the position of the pulley arrangement in the 0m layer of Embodiment 1 of the present invention;

[0031] Figure 5 This refers to the rotation adjustment of the 0m layer heater in Embodiment 1 of the present invention;

[0032] Figure 6 The traction of the 0m layer high-pressure heater in Embodiment 1 of the present invention;

[0033] Figure 7 The traction of the 0m layer low-pressure heater in Embodiment 1 of the present invention;

[0034] Figure 8 This refers to the arrangement of the 10m-layer high-pressure heater and low-pressure heater transport main slide in Embodiment 1 of the present invention;

[0035] Figure 9 This is a schematic diagram of the transport of high-pressure heaters 7B and 7A according to Embodiment 1 of the present invention. Figure 1 ;

[0036] Figure 10This is a schematic diagram of the transport of high-pressure heaters 7B and 7A according to Embodiment 1 of the present invention. Figure 2 ;

[0037] Figure 11 This is a schematic diagram showing the orientation of the high-pressure heater 7B and high-pressure heater 7A in Embodiment 1 of the present invention. Figure 1 ;

[0038] Figure 12 This is a schematic diagram showing the orientation of the high-pressure heater 7B and high-pressure heater 7A in Embodiment 1 of the present invention. Figure 2 ;

[0039] Figure 13 This is a schematic diagram of the transport and placement of high-pressure heater 7B and high-pressure heater 7A according to Embodiment 1 of the present invention;

[0040] Figure 14 This is a schematic diagram of the transport of the low-pressure heater 4B according to Embodiment 1 of the present invention. Figure 1 ;

[0041] Figure 15 This is a schematic diagram of the transport of the low-pressure heater 4B according to Embodiment 1 of the present invention. Figure 2 ;

[0042] Figure 16 This is a schematic diagram of the rotation direction of the low-pressure heater 4B in Embodiment 1 of the present invention. Figure 1 ;

[0043] Figure 17 This is a schematic diagram of the rotation direction of the low-pressure heater 4B in Embodiment 1 of the present invention. Figure 2 ;

[0044] Figure 18 This is a schematic diagram of the transport and placement of the low-pressure heater 4B according to Embodiment 1 of the present invention;

[0045] Figure 19 This is a schematic diagram of the transport of the low-pressure heater 4A according to Embodiment 1 of the present invention. Figure 1 ;

[0046] Figure 20 This is a schematic diagram of the transport of the low-pressure heater 4A according to Embodiment 1 of the present invention. Figure 2 ;

[0047] Figure 21 This is a schematic diagram of the rotation direction of the low-pressure heater 4A in Embodiment 1 of the present invention. Figure 1 ;

[0048] Figure 22 This is a schematic diagram of the rotation direction of the low-pressure heater 4A in Embodiment 1 of the present invention. Figure 2 ;

[0049] Figure 23 This is a schematic diagram of the transport and placement of the low-pressure heater 4A according to Embodiment 1 of the present invention;

[0050] Figure 24 This is a schematic diagram of the support in Embodiment 1 of the present invention;

[0051] Figure 25 Verification calculation one for Embodiment 1 of the present invention;

[0052] Figure 26 This is the second verification calculation for Embodiment 1 of the present invention. Detailed Implementation

[0053] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0054] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0055] Example 1:

[0056] like Figure 1 As shown, this embodiment provides a system including a main slide and an auxiliary adjustment slide; the auxiliary adjustment slide is inclined at one end of the main slide at a preset angle; a heater pulling device is fixed to the end of the main slide away from the auxiliary adjustment slide.

[0057] When transporting heaters, the heaters hoisted onto the adjusting slide can be moved on the slide under the action of the heater traction device, realizing the transport of heaters within the scene. This avoids the problems of long assembly cycle, high shift cost and idle crane when using large cranes for site transfer. Moreover, the transport track can be fully utilized, ensuring the construction period.

[0058] This embodiment takes the conventional island of a nuclear power unit as an example. The conventional island of the nuclear power unit has a total of 4 high-pressure heaters and 4 low-pressure heaters. The 4 high-pressure heaters are high-pressure heater 6A, high-pressure heater 6B, high-pressure heater 7A and high-pressure heater 7B, and the 4 low-pressure heaters are low-pressure heater 3A, low-pressure heater 3B, low-pressure heater 4A and low-pressure heater 4B.

[0059] like Figure 1 and Figure 2 As shown, the high-pressure heaters are arranged in two groups side-by-side on the 0m and 10m levels, and between shafts T.3 and T.4 of the TF-TE series. Their main function is to heat the high-pressure feedwater entering the nuclear island steam generator using steam extracted from the turbine, thereby improving the efficiency of the unit's thermal cycle. The low-pressure heaters are also arranged in two groups side-by-side on the 0m and 10m levels, and between shafts T.5 and T.7 of the TF-TE series. Their main function is to heat the main condensate using steam extracted from the main unit before it enters the deaerator, thereby improving the efficiency of the unit's thermal cycle.

[0060] Specifically, low-pressure heaters 3A, 3B, 6A, and 6B are arranged on the 0-meter level, between axes T.3 and T.7 in column TF-TE. Low-pressure heaters 4A, 4B, 7A, and 7B are arranged on the 10.5-meter level, between axes T.3 and T.7 in column TF-TE. The main installation parameters are shown in Table 1.

[0061]

[0062]

[0063] In this embodiment, the main construction machinery is shown in Table 2, and the main construction tools and materials are shown in Table 3.

[0064]

[0065]

[0066]

[0067] The main process flow for equipment installation is as follows: pre-construction inspection → equipment placement → equipment leveling and alignment → accessory installation; unloading is carried out using a main plant overhead crane (270t or 310t). The transport vehicle reverses into the maintenance area on the 0m level of the conventional island, where the overhead crane unloads the equipment onto the T.10-T.12 axis on the 10.5m level, in the TA-TD row. The load rate calculation is shown in Table 4.

[0068]

[0069]

[0070] When hoisting and transporting goods at the 0m level:

[0071] The slide rails are constructed using HW350×350×12×19 H-beams. Three meters below these H-beams, a span of HW350×350×12×19 H-beams perpendicular to the main slide rails is laid. The centerline of the slide rails coincides with the steel beam 10.2 meters below the operating level and the concrete beam below the 0m level. Specifically, the slide rail between axes T.2 and T.6 on the 0m level is 4.65 meters from the centerline of column TF, and the other slide rail is 6.5 meters from the centerline of column TF, with a center-to-center distance of 1.85 meters between the two slide rails. The longitudinal main track rests on the high-pressure heater and low-pressure heater slide rails, while the other main track rests on concrete and is supported by pads. The transverse track is located at the support positions of the high-pressure heater and low-pressure heater.

[0072] The auxiliary adjusting slide is laid at a 44° angle towards the TF column at the T.6 axis position, extending 13m beyond the TF column. A walkway is added below the slide to prevent the H-beams from sinking into the gravel under stress, thus preventing the slide from exceeding the required height difference and ensuring the track elevation is consistent with the main slide inside the factory. One end of the auxiliary adjusting slide is welded to the main track, while the other end's support is located above a concrete beam. In outdoor areas, it is supported by a water tank foundation or roadbed plate. The simulation equipment's fixed and sliding supports follow a sliding trajectory based on the rotation point. An inclined slide is laid along this trajectory between the auxiliary adjusting slide and the main track. When the heater on the auxiliary adjusting slide is adjusted to the main slide, the rear end of the heater can move on the inclined slide, ensuring the stability of the heater's directional adjustment during transport.

[0073] like Figure 3 The diagram shows the layout and length of the main transport tracks for the high-pressure and low-pressure heaters. When laying the HW350×350×12×19 H-beams, two hydraulic manual forklifts are used to transport the H-beams to the installation position as shown in the diagram. Double-sided 60° bevels are cut on both sides of the H-beams, with a 2mm blunt edge left in the middle. A 3mm gap is left between the two tracks during installation. Q235 welding rods are used for welding. After welding, the transport surfaces of the high-pressure and low-pressure heaters are ground smooth using an angle grinder.

[0074] The joint between the two slide rails should be polished smooth and flat using a grinder. Since there are embedded parts on the platforms of the high-pressure heater and the low-pressure heater, steel plates should be evenly spaced at the bottom of the slide rails during installation to ensure that the slide rails are evenly stressed during transport.

[0075] Along the extended section of the slideway, a 5t winch is positioned between the two slideways. The winch base is welded to the supporting H-beams below. A 20t lifting lug is welded to the side of the H-beam base to serve as the fixed position for the pulley. A pair of 4-wheel 20t pulley blocks and a 10t single pulley are used. One 4-wheel 20t pulley block is secured to the fixed supports of the high-pressure and low-pressure heaters using wire rope clips. The specific placement of the other 4-wheel 20t pulley block and the 10t single pulley is as follows... Figure 4 As shown, the pulley system uses six strands of steel wire rope to pull the high-pressure heater and the low-pressure heater.

[0076] The hauling wire rope used is a 21mm 6*37+FC fiber core steel wire rope. Six strands of the wire rope are wound between pulley blocks for traction. The wire rope pulls from the winch to the 10t guide pulley (the 10t pulley block is connected to the 20t lifting lug welded above the positioning track by a wire rope). After the tension direction is changed by the 10t guide pulley, it connects to the 20t pulley block (the 20t pulley block is fixed to the 20t lifting lug). For example... Figure 4 The diagram shows the arrangement of the pulley system. The 10t guide pulley is the first pulley, and the 20t pulley is the second pulley.

[0077] The shipping sequence is: High-pressure heater 6A - High-pressure heater 6B - Low-pressure heater 3A - Low-pressure heater 3B; the hoisting process to the shipping track is as follows:

[0078] The high-pressure and low-pressure heaters at the 0m level are lifted using an 800t crawler crane. The crane lifts both the high-pressure and low-pressure heaters until their bases are above the slide rails laid at the 0m level of the main plant, at which point the lifting stops. The 800t crawler crane then slowly swings its boom to raise the high-pressure and low-pressure heaters above the slide rails at the 0m level.

[0079] It is important to note that the high and low pressure heaters must be level during lifting and hoisting; no one is allowed to stand under the load or under the crane boom; warning ropes must be set up in the construction area, and unauthorized personnel are not allowed to enter; the crane operator must use a walkie-talkie to give instructions, and the instructions must be clear and unambiguous, and must also be equipped with a walkie-talkie and a flag.

[0080] The high-pressure heater and the low-pressure heater are supported by steel support beams shipped from the manufacturer. The 800t crawler crane slowly lowers its hook to lower the high-pressure heater and the low-pressure heater from the front support beams onto the track, while keeping the load lifted by the 800t crawler crane constant. Then, the iron shoe and the base of the high-pressure heater and the low-pressure heater are welded together.

[0081] Secure the movable pulley to the base of the high-pressure heater and the low-pressure heater.

[0082] Start the winch to tighten the traction pulley block wire rope, and slowly lower the hook of the crane to detach it. Replace the hook with another one 2 meters away from the center of gravity of the equipment.

[0083] When the high-pressure heater and low-pressure heater pull the 800t crawler sling wire rope close to the F-column steel beam, the winch stops pulling forward.

[0084] The 800t crawler crane slowly lowers its hook until the wire rope is no longer under tension. Then, the 800t crawler crane lifts its hook and removes the hanging wire rope from the high-pressure heater and low-pressure heater.

[0085] Start the winch to pull the high-pressure heater and the low-pressure heater to the arc of the slide, that is, the inclined slide.

[0086] Construction plan for the turning point of the slide:

[0087] The east-west oriented slide rail is laid to a point 2m west of axis 7. Based on the transition between the rear supports of the high-pressure and low-pressure heaters, H-beams, of the same material and type as the towing slide rail, are laid between the inclined slide rail and the slide rail along the T.6-T7 axis. Holes are drilled in the connecting beams of the front supports of the high-pressure and low-pressure heaters and the slide rail connecting beams for use... Bolted connection.

[0088] A 20t manual chain hoist is positioned at the T.7 axis of the TE row on the 0m floor (care should be taken to protect the finished product when connecting the manual chain hoist to the T.7 column head). One end of the manual chain hoist is connected to the lifting lug welded below the east-side support of the high and low pressure heaters. When the front support of the high and low pressure heaters is pulled to the T.6 axis position, the front supports of the high-pressure heater and the low-pressure heater are fixed with bolts, and then the manual chain hoist is slowly pulled to begin turning. This continues until the high-pressure heater and the low-pressure heater are completely positioned on the east-west sliding track. Figure 5 The left and right directions refer to the east and west directions.

[0089] A sliding plate, wider than the track, is installed between the high-pressure heater and the track. The front section of the sliding plate is raised to prevent it from hitting the track. Close monitoring of the bottom is conducted during transportation. If any deviation from the track is detected, timely minor adjustments are made.

[0090] Use two 10t hand chain hoists to traction and laterally move the high-pressure heater and low-pressure heater into position. When traction of the high-pressure heater, the hand chain hoist hooks should be attached to the TF-3 column, TE-3, and the 20t lifting lugs welded to the slide rail, with a nominal lifting capacity of [missing information]. Figure 6 As shown. When traction of the low-pressure heater, the hand-operated hoist hook is attached to the TE-6 column, TF-6, and the 20t nominal lifting capacity lug welded to the slide rail, as shown. Figure 7 As shown.

[0091] 10m high-pressure heater and low-pressure heater hoisting and transportation:

[0092] like Figure 8 As shown, the centerline of the 10.2m level slide coincides with the steel beam below. The main slide between axes T.2 and T.6 is 4.65m from the centerline of column TE, and the other slide is 6.15m from the centerline of column TE, with a center-to-center distance of 1.85m between the two slides. The auxiliary adjusting slide is laid at a 35° angle towards column TE between axes T.6 and T.7, extending to between axes T.5 and T.6 of column TD. Slides perpendicular to the column lines are laid on axes T.3, T.4, T.5, and T.6.

[0093] When laying HW350×350×12×19 H-beams, two hydraulic manual forklifts are used in conjunction to transport the H-beams to the installation position according to the parameters shown in the diagram. Double-sided 60° bevels are cut on both sides of the H-beams, with a 2mm blunt edge left in the middle. A 3mm gap is left between the two guide rails during laying. Q235 welding rods are used for welding. After welding, the transport surfaces of the high-pressure heater and low-pressure heater are ground smooth using an angle grinder.

[0094] The joint between the two slide rails should be polished smooth and flat using a grinder. Since there are embedded parts on the platforms of the high-pressure heater and the low-pressure heater, steel plates should be evenly spaced at the bottom of the slide rails during installation to ensure that the slide rails are evenly stressed during transport.

[0095] Along the extended section of the slide, a 5t winch is positioned between the two slides, with the winch base welded to the supporting H-beams below. A 20t nominal lifting lug is welded to the side of the H-beam base to serve as the fixed position for the pulley. A pair of 4-wheel 20t pulley blocks and a 10t single pulley are used. One 4-wheel 20t pulley block is secured to the fixed supports of the high-pressure and low-pressure heaters using wire rope clips. The specific arrangement of the other 4-wheel 20t pulley block and the 10t single pulley is shown in the diagram below. The pulley blocks are wound with 6 strands of wire rope to pull the high-pressure and low-pressure heaters.

[0096] The traction is achieved using 21mm 6*37+FC fiber core steel wire rope. Six strands of the steel wire rope are wound between pulley blocks for traction. The steel wire rope is pulled from the winch to the 10t guide pulley (the 10t pulley block is connected to the 20t lifting lug welded above the positioning track by a steel wire rope). After the tension direction is changed by the 10t guide pulley, it connects to the 20t pulley block (the 20t pulley block is fixed to the 20t lifting lug).

[0097] The shipping sequence is: High-pressure heater 7B - High-pressure heater 7A - Low-pressure heater 4B - Low-pressure heater 4A; the hoisting process to the shipping track is as follows:

[0098] The 10m high low-pressure heater is hoisted using the main gantry crane, which lifts the high-pressure heater and the low-pressure heater from their pre-stored positions and installs them above the slide rail.

[0099] It is important to note that the high and low pressure heaters must be level during lifting and hoisting; no one is allowed to stand under the load or under the crane boom; warning ropes must be set up in the construction area, and unauthorized personnel are not allowed to enter; the crane operator must use a walkie-talkie to give instructions, and the instructions must be clear and unambiguous, and must also be equipped with a walkie-talkie and a flag.

[0100] The high-pressure heater and low-pressure heater are supported by steel support beams shipped from the manufacturer. The high-pressure heater and low-pressure heater are lowered from these support beams onto the track, and then the metal shoe and the bases of the high-pressure heater and low-pressure heater are welded together. A special sliding plate is installed between the high-pressure heater and the track; the width of the sliding plate is greater than the width of the track. The front section of the sliding plate is raised to prevent it from hitting the track. Close monitoring of the bottom is conducted during transportation. If any deviation from the track is detected, timely minor adjustments are made.

[0101] Secure the movable pulley to the base of the high-pressure heater and the low-pressure heater.

[0102] like Figure 9 and Figure 10As shown, a 20t lifting lug is set on the center guide line of the inclined slide. A traction system consisting of a 5t winch, a 10t steering wheel and a 20t pulley block is used to guide the high-pressure heater 7B and the high-pressure heater 7A to the turning point 1.

[0103] like Figure 11 and Figure 12 As shown, insert the steering pin. A pulley block is installed at the T.5 axis, and a 5t winch is used to form a steering traction system for steering.

[0104] Figure 13 As shown, after the turning is completed, a winch is used to pull the machine to the side where the high-pressure heater is positioned. Then, the 20t lifting lugs and 20t hand chain hoists set on both sides are used to pull the machine to the top of the foundation.

[0105] A pulley block is installed on the columns of the T.7 axis and the TF axis. A traction system consisting of a 5t winch and a 10t steering wheel is used to guide the low-pressure heater 4B to the turning point position 1.

[0106] Insert the steering pin A pulley block is installed at the T.5 axis, and a 5t winch is used to form a steering traction system for steering.

[0107] After the turn is completed, the 20t lugs and 20t hand chain hoists set on both sides are used for traction to pull it directly above the foundation.

[0108] A 20t lifting lug is installed on the center guide line of the inclined slide. A traction system consisting of a 5t winch, a 10t steering wheel, and a 20t pulley block is used to guide the low-pressure heater 4A to the turning point position 1.

[0109] Insert the steering pin A pulley block is installed at the T.5 axis, and a 5t winch is used to form a steering traction system for steering.

[0110] See diagrams 4A and 4B for the low-pressure heater placement diagrams for the traction placement diagram.

[0111] After the high-pressure heater and low-pressure heater are pulled into place, use jacks to lower them onto the foundation.

[0112] When positioning the equipment, use jacks to slowly lower it from the transport rails onto the foundation. Fabricate two lifting supports, as follows: Figure 24 As shown, the verification calculation can be performed using conventional tools, such as... Figure 25 and Figure 26The supports and equipment cylinder were secured using a 1-ton hand-operated hoist and a 1-ton sling. The jacks were placed on the building beams, and four 320-ton jacks were used for the lifting operation. Two jack stations were used, with each station controlling two jacks operating simultaneously. Based on the heater's height, sleepers were placed above the jacks, and the heater was slowly lifted. At this point, the heater was entirely supported by the four jacks. After lifting the heater, several sleepers were placed under the heater's fixed base and sliding support. Then, the jacks were slowly lowered so that the jacks and sleepers jointly supported the heater. Once the heater was stable, the transport rails were removed.

[0113] After the track is removed, use jacks to lift the heater appropriately, and remove the sleepers under the heater's fixed and sliding supports. Once this is done, the heater can be lowered into place. Depending on the jacking distance, replace the sleepers under the fixed and sliding supports until it is fully lowered.

[0114] During the descent and positioning, each jack group is operated by one person and supervised by another. The overall commander issues unified instructions, and both groups simultaneously and slowly reduce the pressure to ensure a consistent pressure drop and uniform descent speed, preventing tilting. Once the jacks have returned to their original positions, they are removed.

[0115] Winch load rate verification: Taking the No. 7 high-pressure heater, which has the largest mass, as an example for calculation. The No. 7 high-pressure heater weighs 108.4t. According to the table, the sliding friction coefficient between steels is 0.15 without lubrication and 0.05~0.10 with lubrication. Here, the sliding friction coefficient is taken.

[0116] Calculations show that the sliding friction force during towing is 108.4 × 0.15 = 16.26t. Using a 4-pulley, 20t pulley block with 6 strands for traction, the tension of a single wire rope is 16.26 ÷ 6 = 2.71t. Therefore, the load factor of the winch is 2.71 ÷ 5 × 100% = 54.2%.

[0117] Refer to the winch instruction manual for the 21mm wire rope specifications:

[0118] Manual hoist load rate verification: Taking the No. 7 high-pressure heater with the largest mass as an example, the sliding friction force during hauling is 16.26t. Therefore, the force on a single hoist is 16.26 ÷ 2 = 8.13t. Thus, the load rate of a single manual hoist is 8.13 ÷ 20 × 100% = 40.7%.

[0119] Nozzle verification: Homemade nose welds must be polished smooth, with no burrs on the surface; Weld calculation: Fillet weld dimension: LW = 0.8S mm (S = 10 mm); Weld height: h = 0.707LW; Weld length: L = 600 mm; Weld cross-sectional area A = L × h = 600 × 0.707 × 0.8 × 10 = 3393.6 mm² 2The calculated shear stress of the weld is 162600 / (3393.6×0.7) = 68.5 < [τ] = 125 MPa, which meets the requirements.

[0120] Taking the largest high-pressure heater with a weight of 108.4t as an example, the bottom steel section spans 3m. There are 3 supports for the high and low pressure heaters. Considering the load is evenly distributed, there are 4 stress points. Then the normal force on a single steel section within 3m is: 108.4 / 4 = 27.1t.

[0121] Example 2:

[0122] This embodiment provides a method for transporting conventional island heaters in nuclear power units. It uses the conventional island heater transport equipment described in Embodiment 1, which includes: moving the heaters hoisted onto the regulating slide under the action of the heater traction device to achieve the transport of the heaters within the scenario.

[0123] Specifically, the heater is lifted using tracked slings until it is higher than the slide rail, at which point the lifting is stopped; the heater is then lifted onto the slide rail.

[0124] Place the front end of the heater above the auxiliary adjustment slide;

[0125] Start the winch to pull the heater; when the heater pulls the wire rope of the crawler sling, the winch stops pulling forward;

[0126] The crawler sling is slowly lowered until the wire rope is no longer under tension, then the hanging wire rope is removed from the heater.

[0127] Start the winch and pull the heater to the inclined slide;

[0128] The rear end of the heater moves on the inclined slide, adjusting the heater on the auxiliary adjustment slide to the main slide. The winch is then started to transport the heater to the preset position.

[0129] The above description is merely a preferred embodiment of this practice and is not intended to limit the scope of this practice. Various modifications and variations can be made to this practice by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this practice should be included within the protection scope of this practice.

Claims

1. A method for transporting conventional island heaters in a nuclear power unit, characterized in that, A conventional island heater transport device for nuclear power units was adopted, including a main slide and an auxiliary regulating slide; The auxiliary adjusting slide is inclined at a preset angle at one end of the main slide; a heater pulling device is fixed to the end of the main slide away from the auxiliary adjusting slide; an inclined slide is provided between the main slide and the auxiliary adjusting slide; the length direction of the main slide is parallel to the axis direction of the heater after it is transported and positioned; the heater pulling device is a winch, and a steel wire rope is provided on the winch; the end of the steel wire rope away from the winch is connected to the heater; the steel wire rope passes through the first pulley and the second pulley in sequence; the central axis of the first pulley is located on the center line of the main slide, and the central axis of the second pulley is located on the center line of the auxiliary adjusting slide; the steel wire rope is a fiber core steel wire rope. Both the main slide and the auxiliary adjustment slide are laid with H-beams; below the H-beams, H-beams perpendicular to the main slide are laid at a preset position; Steel plates are evenly spaced at the bottom of both the main slide and the auxiliary adjusting slide; The method includes: under the action of the heater pulling device, moving the heater hoisted on the adjusting slide rail on the slide rail to realize the transport of the heater within the scene; Use tracked slings to lift the heater until it is above the slideway, then stop lifting; lift the heater onto the slideway. Place the front end of the heater above the auxiliary adjustment slide; Start the winch to pull the heater; when the heater pulls the wire rope of the crawler sling, the winch stops pulling forward; The crawler sling is slowly lowered until the wire rope is no longer under tension, then the hanging wire rope is removed from the heater. Start the winch and pull the heater to the inclined slide; The rear end of the heater moves on the inclined slide, adjusting the heater on the auxiliary adjustment slide to the main slide. The winch is then started to transport the heater to the preset position.

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