JP3796806B2 - Tube bundle support structure for air-cooled heat exchanger - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tube bundle support structure for an air-cooled heat exchanger used in a nuclear power plant or a reprocessing facility thereof.
[0002]
[Prior art]
Currently, there is an air-cooled heat exchanger installed outside the facility as shown in FIG. 5 as one of the heat exchangers that are being considered for application to nuclear power plants and reprocessing facilities.
[0003]
As shown in the figure, this air-cooled heat exchanger arranges and supports a plurality of tube bundles 2 that are unitized in a substantially rectangular shape on a frame 1 made of steel, and a fan 3 is placed below the tube bundle 2. A plurality of pipe bundles are provided by flowing a high-temperature fluid such as hot water sent from the above-mentioned facility or the like to each tube bundle 2 and forcibly sending outdoor cold air to each tube bundle 2 side by a fan 3. The high-temperature fluid flowing through the inside 2 is effectively cooled.
[0004]
As shown in FIGS. 6 and 7, the tube bundle 2 includes headers 5 and 5 for flowing and discharging the high-temperature fluid on both sides of a rectangular tube bundle frame 4 having a width of several meters and a length of several tens of meters. In addition, a plurality of heat transfer tubes 6 are bridged in parallel between the headers 5 and 5, and the lower end portion of the tube bundle frame 4 is placed on the frame 1 as shown in FIG. The lower end portion is supported and fixed on the frame 1 by using a plurality of connecting members 7 having an L-shaped cross section, for example, and using a plurality of connecting bolts 8.
[0005]
[Problems to be solved by the invention]
By the way, since it is difficult to assemble such a large structure such as an air-cooled exchanger with high accuracy, both the tube bundle frame 4 of the tube bundle 2 and the large structure such as the frame 1 are bolted together. It is extremely difficult to accurately align the positions of the bolt holes 9a and 9b. Therefore, when such large structures are bolted together, as shown in FIG. 8, the diameter of one bolt hole 9b (generally the frame 1 side in the above example) is set to the other bolt hole. In general, a method is adopted in which the bolt holes 9a and 9b are allowed to be displaced by being formed to be considerably larger than the diameter of 9a. However, in the method of enlarging one of the bolt holes 9b in this way, when a shake such as an earthquake is applied, the bolt hole 9b may move due to backlash at the connecting portion, and is used particularly in the nuclear facilities as described above. In the case of an air-cooled heat exchanger, it is not possible to adopt a support and fixing method that causes such movement due to backlash. Therefore, in such an air-cooled heat exchanger, the tube bundle 2 is once placed on the frame 1 and the positions of the bolt holes 9a are marked on the frame 1 side. 4 is moved or raised laterally from the frame 1 to drill a new bolt hole 9b at the marking position, and the bolt hole 9b is coated with a stab, and then the tube bundle frame 4 of the tube bundle 2 is mounted again. A method of performing bolting after placing on 1 while being aligned has been studied.
[0006]
However, in such a marking method, the tube bundle 2 itself is a heavy object (for example, about 17 tons) and the work is performed in a narrow work area at a high place. There are problems such as spending labor and time.
[0007]
Therefore, the present invention has been devised in order to effectively solve such problems, and its purpose is to reduce the man-hours for work in high places at the time of supporting and fixing the tube bundle frame on the frame beam. The present invention provides a tube bundle support structure for a new air-cooled heat exchanger that can significantly reduce labor and work time.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a tube bundle support structure for an air-cooled heat exchanger in which a substantially rectangular tube bundle frame is horizontally supported and fixed on a frame beam via a connecting bolt. The frame side anchor block is detachably provided with a connecting bolt so as to be positioned in the vicinity of the bolt hole formed in the frame beam, and the frame side anchor block is attached to and detached from the bolt hole with the connecting bolt. The beam side anchor block is pressed from the top and fixed to the frame beam side.
[0009]
As a result, even if the tube bundle frame placed on the frame beam is slightly deviated from a predetermined position, the tube bundle frame can be easily and reliably supported and fixed to the frame beam side.
[0010]
Further, a gap adjusting shim formed by laminating thin plates is provided between the tube bundle frame and the frame side anchor block and between the frame side anchor block and the frame side anchor block. Since the distance between the gaps is adjusted by adjusting the number, it is possible to effectively prevent the horizontal deviation as well as the vertical direction of the tube bundle frame even if a shake such as an earthquake is applied.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, a preferred embodiment for carrying out the present invention will be described.
[0012]
1 and 2 show an embodiment according to the present invention. In the figure, reference numeral 1a denotes a horizontal upper beam positioned on the upper part of the frame 1 described above, and reference numeral 4 denotes a beam placed on the frame beam 1a. The structure of the frame 1 and the tube bundle frame 4 is the same as the conventional one described above.
[0013]
A frame-side anchor block 10 made of a highly strong material such as carbon steel is detachably attached to the lower end side portion of the tube bundle frame 4 by connecting bolts 8. In the bolt hole 11 of the frame beam 1 a in the vicinity of the anchor block 10, a frame beam side anchor block 12 having a similar die shape is detachably attached by a connecting bolt 8.
[0014]
Further, as shown in FIG. 1, a shoulder 10a is formed on the bolt hole 11 side upper portion of the frame side anchor block 10, and a flange portion is formed on the frame side anchor block 10 side upper portion of the frame beam side anchor block 12. 12a is formed so as to extend in the horizontal direction from this, and the flange portion 12a of the frame beam side anchor block 12 is engaged so as to press the shoulder portion 10a of the frame side anchor block 10 from above.
[0015]
Further, a metal thin plate is provided between the frame side anchor block 10 and the frame beam side anchor block 12 as shown in FIG. 1 and between the frame side anchor block 10 and the tube bundle frame 4 as shown in FIG. A plurality of gap adjusting shims 13 are provided, and the distance between the gaps S1 and S2 can be arbitrarily adjusted. The bolt hole 14 on the tube bundle frame 4 side to which the frame side anchor block 10 is attached and the bolt hole 11 on the frame beam 1a side are so-called loose holes, but the diameter is the bolt diameter to be used plus 2 mm. This is the allowable range of the air-cooled heat exchanger described above.
[0016]
Next, an example of a method for supporting and fixing the tube bundle frame to the frame beam side with such a configuration will be described.
[0017]
First, as shown in FIG. 2 using a crane or the like (not shown), the tube bundle frame 4 is placed on the frame beam 1a, and then the gap adjusting shim 13 and the connecting bolt are used in the bolt hole 14 of the tube bundle frame 4. The frame side anchor block 10 is fixed. At this time, the number of thin plates constituting the gap adjusting shim 13 is increased or decreased so that the center part of the frame side anchor block 10 fixed to the tube bundle frame 4 side is in the vicinity of the bolt hole 11 formed in the frame beam 1a. And adjust its position. Next, as shown in FIG. 1, the frame-side anchor block 12 is positioned next to the frame-side anchor block 10 with the gap adjusting shim 13 interposed therebetween, and the flange portion 12 a is placed on the shoulder portion of the frame-side anchor block 10. 10a is engaged. At this time, if the positions of the bolt holes 15 of the frame beam side anchor block 12 and the bolt holes 11 of the frame beam are shifted, the number of thin plates constituting the gap adjusting shim 13 is increased or decreased to increase the frame beam side anchor. After the block 12 is moved close to and away from the frame-side anchor block 10 to align the bolt holes 11 and 15, the frame-side anchor block 12 is fixed to the frame-beam 1 a side by the connecting bolt 8. Become.
[0018]
That is, the frame side anchor block 10 fixed to the tube bundle frame 4 side by such a support structure is fixed to the frame beam 1a side by the vertical and horizontal movements restricted by the frame beam side anchor block 12. become. Even if the placement position of the tube bundle frame 4 is slightly deviated from the predetermined position, the thicknesses of the two gap adjusting shims 13 and 13 can be changed and the two anchor blocks 10 and 12 can be moved. Even if the misalignment occurs, it is possible to easily and reliably support and fix the tube bundle frame 4 on the support beam 1a by the anchor blocks 10 and 12.
[0019]
In this embodiment, the displacement in the vertical direction and in the direction of the anchor beam side anchor block 12 can be effectively suppressed, but the displacement in the opposite direction of the anchor beam side anchor block 12 cannot be effectively suppressed. Therefore, as shown in FIG. 3, the frame side anchor block 10 is also provided with the frame beam side anchor block 12 as shown in FIG. 3, and the shoulder portion 10a and the flange portion 12a A pitch-shaped groove may be formed on the contact surface. Further, as shown in FIG. 4, the frame-side anchor block 12 is enlarged without forming the shoulder portion 10a on the frame-side anchor block 10 side, and the configuration of the present invention is simplified, thereby reducing the manufacturing cost. Can be achieved.
[0020]
【The invention's effect】
In short, according to the present invention, the following excellent effects are exhibited.
[0021]
1. Since the frame and the tube bundle frame are connected using the two anchor blocks, the tube bundle frame can be effectively supported and fixed on the frame even if the placement position of the tube bundle frame with respect to the frame is slightly shifted.
[0022]
2. Therefore, since the position correction work, marking, and drilling work can be omitted, labor and time can be reduced.
[0023]
3. Since no drilling or painting work is required on site, the work at high places is greatly reduced and the safety during assembly is improved.
[Brief description of the drawings]
FIG. 1 is an overall view showing an embodiment of the present invention.
FIG. 2 is a sectional view taken along line XX in FIG.
FIG. 3 is an overall view showing another embodiment of the present invention.
FIG. 4 is an overall view showing another embodiment of the present invention.
FIG. 5 is a perspective view showing a part of a conventional air-cooled heat exchanger.
FIG. 6A is a plan view showing a tube bundle according to the present invention.
(B) is ZZ sectional drawing in FIG. 6 (A).
7 is a cross-sectional view taken along line YY in FIG. 6 (A).
FIG. 8 is an enlarged view showing a portion A in FIG. 7;
[Explanation of symbols]
1a frame beam 4 tube bundle frame 10 frame side anchor block 11 bolt hole 12 frame beam side anchor block 13 gap adjusting shim

Claims (2)

In a tube bundle support structure of an air-cooled heat exchanger in which a substantially rectangular tube bundle frame is horizontally supported and fixed on a frame beam via a connecting bolt, a bolt formed on the frame beam at the lower end of the tube bundle frame The frame side anchor block is detachably provided with a connecting bolt so as to be located in the vicinity of the hole, and the frame side anchor block is pressed from above with a beam side anchor block that is attached to and detached from the bolt hole with the connecting bolt. A tube bundle support structure for an air-cooled heat exchanger, which is fixed to the beam side. A gap adjusting shim formed by laminating thin plates is provided between the tube bundle frame and the frame side anchor block, and between the frame side anchor block and the frame beam side anchor block, and the number of thin plates of each of these gap adjusting shims. 2. The tube bundle support structure for an air-cooled heat exchanger according to claim 1, wherein the distance between each of the gaps is adjusted by adjusting the distance.

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