CN101638252B - Deaerator assembling method - Google Patents

Abstract

The invention discloses a deaerator assembling method, which comprises the following steps of: (1) laying hauling tracks on a deaerator platform; (2) sequentially and respectively lifting two sections of deaerator cylinder bodies onto the tracks; (3) hauling the deaerator cylinder bodies to an assembling position; (4) jacking up the deaerator cylinder bodies, assembling permanent supports and then assembling the deaerator cylinder bodies on the permanent supports; and (5) combining the two sections of deaerator cylinder bodies into a whole. The assembling process of the invention is simpler than that of the prior art. If the preparation work is ready, the deaerator can be lifted and hauled to the assembling position in two days. Therefore, the method has the advantages of greatly shortening the assembling time, at least shortening the construction period by 1.5 months from the original construction period and saving investment, time, manpower and material resources.

Description

Deaerator installation method

technical field

The invention relates to a method for installing nuclear power plant equipment, in particular to a method for installing a deaerator. the

Background technique

The deaerator hoisting scheme of the Ling Ao Phase II nuclear power plant is that the deaerator is divided into four sections, and the four-section cylinder is dragged to the bottom of the lifting beam in the auxiliary room in the order of four, three, two, and one, and is lifted by the hoist-pulley block lifting mechanism. Lift the cylinder horizontally from zero meter to the oxygen removal layer, rotate it 90°, switch the lifting point of the cylinder from the lifting beam to two sets of 40-ton cat head cranes installed on the walking beam, and pull the cylinder through the hoist traction mechanism Transport it to the equipment foundation, and then use the weight mover to move it horizontally to the equipment foundation (the center of the walking beam is offset from the center line of the deaerator foundation to the direction of row C by 2100mm). Lift up the deaerator cylinder with a jack, install the permanent support and put it in place. The following shortcomings were found during the implementation of this scheme:

1) Long hoisting period: The hoisting process is cumbersome and prone to accidents, resulting in a long hoisting period;

2) Long welding period: the deaerator arrives in four sections, and the welding workload is heavy after being hoisted in place. There are 3 welding seams in total, which takes about 3 months and takes a long time;

3) Because two rows of side-by-side walking beams are built on the top of the oxygen removal layer only for hoisting, it is a waste of investment;

4) The hoisting beam on the center line of the vertical deaerator on the top of the deaerator layer is only used for hoisting, which is a waste of investment;

5) Due to the construction of walking beams, the beams and columns above the oxygen removal layer + 28.2m are all load-bearing beams and columns, which wastes investment;

6) There are many interfaces with civil engineering: 

辅助间起吊通道①-②轴之间除氧层及其以下各层楼面板缓筑； 

Deoxidation layer between shafts ①-② of the auxiliary room hoisting channel and the floor slabs of the floors below it shall be constructed slowly;

除氧器筒体最长一段的设计长度为12.7m，考虑两端的封头及等尺寸公差等，按总长度为13m考虑，为确保筒体有足够的起吊提升通道，缓建辅助间①-②轴C排侧除氧层及以下的各层横梁内侧半边部分，保证至少有13.2m的横向提升空间。 

The design length of the longest section of the deaerator cylinder is 12.7m. Considering the heads at both ends and the dimensional tolerance, etc., the total length is 13m. In order to ensure that the cylinder has enough hoisting and lifting passages, the auxiliary room is delayed ①- ② For the deoxygenation layer on the side of the axis C row and the inner half of the beams of each layer below, ensure that there is at least 13.2m of horizontal lifting space.

缓建除氧层28.2m至36.5m北端墙体(包括横梁和墙面板等)。 

Delayed construction of the oxygen removal layer 28.2m to 36.5m north end wall (including beams and wall panels, etc.).

除氧器各段筒体临时支座处基础支墩缓建(如有)。 

The foundation buttress at the temporary support of each section of the deaerator shall be built slowly (if any).

7) A series of test procedures are required to make lifting tools such as cat head cranes, and the process is cumbersome. the

Contents of the invention

The technical problem to be solved by the present invention is to provide a deaerator installation method to solve the problems of long hoisting time, long welding period, high investment and complicated procedures. the

The technical scheme that the present invention adopts to solve its technical problem is: a kind of deaerator installation method, comprises the following steps:

(1) Lay the haulage track on the deaerator platform;

(2) Lift the cylinders of the two sections of the deaerator to the hauling track in turn;

(3), then tow and haul it to the installation location;

(4), jack up the deaerator cylinder, install the permanent support and put it in place;

(5) Combine the two-stage deaerator cylinder into one body. the

In the step (1), the preferred solution is: laying a haulage track on the deaerator platform, that is, the 28.2-meter layer, and laying the haulage track along the central line of the deaerator.

In the step (1), it also includes: detecting and adjusting the haulage track that has been laid, and assembling it in the zero-meter hoisting area of the corresponding haulage track (that is, the outer area of the factory building under the deaerator in place layer) for placing the deaerator. Temporary support seat for the cylinder of the oxygen tank, place and adjust the cylinder. the

In the described step (2), the preferred solution is: two cranes are correspondingly arranged in the zero-meter hoisting area corresponding to the haulage track, and the two sections of deaerator cylinders are lifted onto the haulage track in turn by the cranes, and the The two cranes are respectively arranged at corresponding positions on both sides of the front side of the hauling track. the

In the step (3), the preferred solution is: use the heavy object mover to cooperate with the winch to drag and haul the two-stage deaerator cylinder to the installation position. the

In the described step (3), the most preferred solution is: a heavy object mover is provided on the hauling track, the hoisted deaerator cylinder is placed on the heavy object mover, and after the position direction of the deaerator cylinder is adjusted , and then the two-stage deaerator cylinders are towed and hauled to the installation location in sequence by the hoist. the

In the step (4), the preferred solution is: jack up the cylinder body of the deaerator, withdraw the heavy object mover, install the permanent support and put it in place. the

In the step (4), the most preferred solution is: use a jack to lift the cylinder body of the deaerator, withdraw the heavy object mover and the hauling track, install the permanent support and put it in place. the

In the step (5), the preferred solution is to align the openings of the two-stage deaerator cylinders, and combine the two-stage deaerator cylinders together by welding. the

In the step (5), the most preferred solution is: adjust the elevation, level and concentricity of the cylinder body of the two-stage deaerator by installing the overhaul beam crane and the bottom jack on the top of the deaerator, and adjust the butt weld gap and radial Deviation, after confirming that it meets the requirements, temporarily fix the two-stage deaerator, and then combine the two-stage deaerator cylinders together by welding. the

Compared with the prior art, the installation process of the present invention is relatively simple. As long as the preparation work is in place, the deaerator can be hoisted and hauled in place within two days, which greatly shortens the installation time. In addition, it has the following advantages: 1. The deaerator is delivered in two sections, and there is only one circular weld for on-site assembly, which reduces the workload of on-site welding counterparts, and the construction period can be compressed by at least 1.5 months on the original basis; compared with on-site welding, it is convenient to carry out welding at the equipment manufacturer. The conditions are good and the welding quality is guaranteed; 2. The design of the frame structure above the +28.2m deaeration layer does not need to consider the hoisting load, which can save investment; With the technology, two walking beams and one lifting beam can be saved, which saves investment; 4. It is not necessary to repeatedly make cat head cranes and other lifting tools, and do not need to do a series of test hoisting procedures, saving time, manpower and material resources. the

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

Fig. 1 is a block diagram of the installation process of an embodiment of the present invention;

Figure 2 The crane station diagram where the deaerator is hoisted in sections by the crane. the

Detailed ways

As shown in Figure 1, it is the installation steps of the deaerator, and the installation steps are divided into the following parts:

1. Deaerator production: The deaerator is assembled into 2 sections at the equipment manufacturer, and each section is equipped with 4 temporary supports, separated by 8m. The volumetric weight of each section is shown in Table 1:

Table 1:

serial number Part Name quantity Dimensions (mm) Length × Width × Height Design net weight (t) Manufacturing weight (t) Hoisting load t (take 1.1 times the dynamic load factor) 1 Deaerator I stage 1 ～25396×5080×5975 ~119.6 ~132.7 ～145.97 2 Deaerator II stage 1 ～24796×5080×5975 ~109 ~119.9 ～131.89

 The ADG system deaerator is located on the 28.2-meter floor of the conventional island plant. It is divided into two sections of cylinder during hoisting. The weight of the heaviest section of the cylinder is about 150 tons, the length is about 25.4 meters, the diameter is 4356mm, and the total height is about 6 meters. Hoist from the BC span on the south side of the MB plant (the area outside the plant under the floor where the deaerator is in place).

2. Hoisting preparation:

1. The hoisting and hauling end of the factory building (11 shafts) has a delay in the construction of interlayer walls (including all structures such as beams and wall panels) ranging from 28.2 meters to 39.1 meters;

2. Slow installation of the walking beam in the oxygen removal room (this article depends on the design height of the walking beam to determine whether it is necessary, if its height falls within the scope of the haulage channel, it must be installed slowly);

3. Delayed construction of the foundation of the steam converter on the 28.2m floor of the auxiliary room; delayed construction of the stairs. the

4. The design strength of platform beams and shaft columns on the 28.2-meter-floor 4-axis to 11-axis (from the front end of the deaerator to the south axis of the factory building) meets the haulage requirements, and the maximum load during haulage is about 220 tons;

5. The construction of the hoisting area at the hoisting and hauling end of the factory building is postponed. The site area is required to be flat and fully rolled and compacted according to the site hoisting needs, consistent with the elevation of the road, and the pressure resistance is not less than 25t/m ² .

6. Due to the laying of sleepers, the distance between the elevation of the permanent support of the deaerator and the floor slab should not be too small, and it is preliminarily estimated to be greater than 400mm. the

7. The inspection of the crane device is completed, the mechanical device is flexible and reliable, and the performance is reliable. the

8. The crane station at the hoisting and hauling end of the plant has been backfilled to 0m or above, and the ground strength is 15t/ ^m2 or above.

9. The transportation channel is smooth to meet the transportation requirements. the

3. Tools and machinery required for installation:

1. One 250t crawler crane;

2. One 150t truck crane;

3. The heavy-duty hauling track beam is 160 meters;

4. Two 5t winches;

5. 4 sets of 60t heavy object transfer devices;

6. 10t (2×2) pulley block;

7. 8 jacks;

Fourth, the haulage track laying:

Deaerator hauling track is arranged on the 28.2m floor of the auxiliary room: the track is laid along the central line of the deaerator, and the track is made of HW400×400H steel. 8m and 12m. the

Re-measure the centerline, elevation and level of the haulage track to ensure that the centerline deviation does not exceed ±5mm, the elevation deviation does not exceed ±5mm, and the levelness is ≤0.5mm/m, otherwise it should be adjusted. the

Retest and check that the height difference of a single hauling track should be ≤ 3mm, and the gap at the joint of a single track should be ≤ 1mm, no

should be adjusted. the

5. Crane setting

As shown in Figure 2, two cranes 5 and 6 are respectively arranged in the zero-meter hoisting area, that is, corresponding positions on both sides of the front side of the hauling track 2. the

6. Arrangement of hoist

On the 28.2-meter platform between columns B to C (columns on both sides of the deaerator), a 5t winch is arranged at the positions of the two columns in front of the deaerator near the 3rd axis and 4th axis near the column C. There are 2 units in total. Each winch will be bound and fixed with the nearby pillars with steel wire ropes, and then block blocks will be arranged at appropriate positions to ensure that the dragging process of the deaerator along the slideway is stable and reliable. the

7. Deaerator hoisting steps:

1) Install a winch in the oxygen-removing layer and arrange the traction system;

2) Lay two hauling track beams on both sides of the center line of the deaerator from the 3rd axis to the 11th axis (the front end of the deaerator to the south axis of the plant);

3) Assemble the temporary support base and the first section of the deaerator cylinder (head end) in the zero-meter hoisting area, and adjust the direction of the cylinder to be consistent with the installation direction. the

4), tie the slings and hooks, and use two cranes to lift the cylinder vertically until the bottom of the temporary support base is higher than the height above the surface of the heavy object mover arranged on the end of the track. the

5) The crane 5 slowly swings the rod in the direction of the 11th axis (that is, toward the direction of the factory building), and the crane 6 moves slowly in the same direction to move the deaerator cylinder slowly toward the deaerator room, and make the temporary support seat at the front end Slowly land on two weight movers arranged on haul rails. the

6) Readjust the cylinder direction and front-to-back level, connect the hoist traction system at the front end of the cylinder, start the hoist, so that the cylinder is initially stressed but does not move forward obviously. the

7) Check that there is no abnormality in the cylinder body of the deaerator, the front and rear cranes and the traction system, slowly loosen the 5 hooks of the crane, and completely place the temporary support seat at the front end of the cylinder body on the heavy object mover, and then check again if there is no abnormality Remove the front sling and withdraw from the crane 5. the

8), continue to start the traction system of the hoist, the crane 6 moves forward slowly in the same direction, and continues to slowly move the cylinder to its base direction, and make the temporary support seat at the rear end fall into the end of the hauling track. the

9) Arrange two other heavy object movers at the end of the track, readjust the direction of the cylinder, loosen the 6 hooks of the crane, and place the rear support of the cylinder on the heavy object mover. the

10) Recheck the traction system, the cylinder and the force of the four heavy object movers. After confirming that there is no abnormality, release the lifting rope of the crane 6 and withdraw the crane 6. the

11) Continue to start the traction system of the winch, and drag the cylinder to the top of its foundation. the

12) Lift the cylinder out of the heavy object mover, and temporarily store the cylinder on the hauling track. the

13) According to the procedures 3) to 12), carry out the hoisting work of the second section of the cylinder body. the

14) Jack up the cylinder again, withdraw the hauling track beam, and lower each section of the cylinder into place. the

8. Combination steps of deaerator:

1) Before the deaerator cylinders of each section are combined, the vertical and horizontal centers and elevations of each section should be preliminarily adjusted. the

2) Use 4 jacks to support the temporary support legs of the second-stage deaerator, remove the internal temporary support for transportation reinforcement, and check the quality of its internal components. the

3) When aligning the deaerator, first measure the circumference and ellipticity of the interface, and perform the alignment of the deaerator after the circumference deviation, ellipticity deviation and diameter deviation of the interface in all directions meet the requirements. , otherwise it should be corrected first. the

4) According to the requirements of the installation drawings, make welding grooves on the joints on both sides, and thoroughly polish the welding grooves. The protective grease within 150mm around the grooves on the two adjacent end faces should be cleaned. the

5) Adjust the elevation, level and concentricity of the deaerator in the rear section by installing the inspection beam crane on the top of the deaerator and the jack at the bottom. the

6) Adjust the gap and radial deviation of the butt weld to make the gap of the whole circle of weld uniform and meet the requirements of the installation drawing. the

7) After the matching is completed, check the vertical and horizontal center and elevation of the deaerator relative to the foundation. At this time, a certain deviation is allowed, but the deviation should not be too large. The positioning is fixed firmly, and the straightness of the deaerator after the docking is checked again, and then the welding department performs the welding work of the cylinder. The welding process is carried out symmetrically and synchronously by four welders. The welding speed in the four directions should be basically consistent and the welding speed should be controlled to prevent thermal deformation. the

8), welding should be heat treated and non-destructive testing inspection work as required. the

9) After the cylinder is assembled, install each internal component. The internal components shall be ground and cleaned according to the requirements of the drawing, and the protective grease within 150mm around the grooves of the two adjacent end faces shall be cleaned, and then the alignment shall be corrected, and fixed with temporary positioning and fixing measures after meeting the requirements. the

Claims (6)

1. a deaerator assembling method is characterized in that, may further comprise the steps:

(1), lays the haul track at the oxygen-eliminating device platform;

(2), two sections oxygen-eliminating device cylindrical shells are lifted respectively on the haul track successively;

(3), then its traction is hauled to the installation site;

(4), jack-up oxygen-eliminating device cylindrical shell, install behind the permanent bearing in place;

(5), two sections oxygen-eliminating device cylindrical shells are combined into one;

In the said step (1), lay the haul track at the oxygen-eliminating device platform, the haul track lays along oxygen-eliminating device center line in place; Detect adjustment to laying the haul track of accomplishing, haul zero rice lifting zone of track in correspondence and assemble the interim supporting seat that is used to place the oxygen-eliminating device cylindrical shell, place and adjust cylindrical shell;

In the said step (2), the regional correspondence of zero rice lifting of hauling track in correspondence is provided with two cranes, with crane two sections oxygen-eliminating device cylindrical shells is lifted respectively on the haul track successively, and described two cranes are separately positioned on hauls both sides, track front correspondence position.

2. deaerator assembling method according to claim 1 is characterized in that, in the said step (3), cooperates windlass that two sections oxygen-eliminating device cylindrical shell tractions are hauled to the installation site with the weight shifter.

3. deaerator assembling method according to claim 2 is characterized in that, in the said step (4), jack-up oxygen-eliminating device cylindrical shell is withdrawn from the weight shifter, installs behind the permanent bearing in place.

4. deaerator assembling method according to claim 3 is characterized in that, in the said step (4), the oxygen-eliminating device cylindrical shell of jack-uping is withdrawn from weight shifter and haul track, installs behind the permanent bearing in place.

5. deaerator assembling method according to claim 1 is characterized in that, in the said step (5), looks for mouth to align to two sections oxygen-eliminating device cylindrical shells, through welding two sections oxygen-eliminating device cylindrical shells is combined.

6. deaerator assembling method according to claim 5; It is characterized in that, in the said step (5), hang absolute altitude, level and the concentricity of adjusting two sections oxygen-eliminating device cylindrical shells with the bottom lifting jack through being installed in oxygen-eliminating device top maintenance beam; Adjustment butt joint weld bond gap and radial missing; After confirming to meet the requirements,, through welding two sections oxygen-eliminating device cylindrical shells are combined again two sections interim positioning and fixing of oxygen-eliminating device.

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