JPS60201200A - Pressurized casing fittings - Google Patents

Abstract

PURPOSE:To facilitate fitting work by providing a fitting main body comprising a set ring fitted to a base plate of a skirt and a parallel reinforcing beam deposited to one side of the set ring. CONSTITUTION:When a set ring 21 is fitted to a skirt 5 disposed on the lower end side of a pressurized casing laid sideways, the set ring is installed in a base plate 10, and the end portion of a reinforcing beam 22 is brought into contact with the base plate 10 to be located at a set position. Then, a bolt 28 is tightened to complete setting. The shearing distributed load applied upon the skirt end 5 at the time of erecting the pressurized casing is mostly received by axial force by the reinforcing beam 22. Accordingly, such reinforcing member can be decreased in number in cooperation with the miniaturization of a moment arm.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a pressure vessel fixture, and more particularly to a pressure vessel fixture having a skirt.
The present invention relates to an installation tool suitable for use in the installation work of a vertical cylindrical pressure vessel.

[Background of the invention]

Generally, vertical pressure vessels are larger in length than diameter, so they are transported horizontally and erected when installed on site. Normally, a crane is used for the erection work from the horizontal position, and as shown in FIG. As shown in FIG.
A method is employed in which a pedestal 8 with rollers 7 is connected with pins 9 to enable rolling movement, and the top lug 2 is suspended by a wire. The former uses two cranes to raise the top lug 2 and lower the skirt lug 3 at the same time, so it is used in places where there is a relatively wide space, while the latter is used in narrow spaces or when the pressure vessel 1 is a large-diameter heavy object. applied at some time.

By the way, in any of the above-mentioned methods, providing the lugs 3.6 on the skirt 5 provided at the bottom of the container and having the lugs 3.6 bear half of the weight of the container 1 is a problem in construction. That is, the skirt 5 is a non-pressure part, has a relatively thin wall, low rigidity, and has an open cross section. For this reason, this skirt portion is reinforced in order to prevent damage due to unavoidable loads during installation.

Conventional reinforced fixtures are shown in Figures 3-8. First, the reinforcing structure shown in FIGS. 3 and 4 is applied to a two-point suspension method, and lugs 3 are provided along the longitudinal direction at the corners of the skirt 5 and the base plate 10 at the lower edge. Reinforcing ribs 11 are attached along the circumferential direction on both sides of the shaft to distribute concentrated loads. next,
The method shown in FIGS. 5 and 6 is also applied to the two-point suspension method, but in this case, a plurality of reinforcing stays 12 are stretched radially within the open end of the skirt 5, and the rigidity due to the open cross section is reduced. This was an attempt to prevent the decline. Furthermore, the seventh
The structure shown in FIGS. 1 to 8 is an application of the bottle structure method shown in FIG. The reinforcing stay 14 is welded and integrated along the center line of door 13, and the lug 6 is attached to the reinforcing stay 1.
There are a few words above 4. In addition, in this example, since the lug 6 for pin connection is attached to the lower surface of the skirt 5, the reinforcing member must be removed while the skirt 5 is lifted by a crane.
I try to set it with .

However, all of the above conventional fixtures have the following drawbacks. That is, the first structure shown in FIGS. 3 and 4 is applicable only to pressure vessels 1 that are small in diameter and lightweight, but in pressure vessels 1 that are large in diameter and heavy, the skirt 5 has an open cross section and has sufficient rigidity. Therefore, it cannot be applied unless the thickness of the skirt 5 and base plate 10 is made larger than necessary. Furthermore, the second structure shown in FIGS. 5 and 6 has the disadvantage that the load burden due to the partial reinforcing stays 12 becomes large. In other words, the problem with this structure is the load distribution of the pressure vessel, and the load distribution in which the own weight of the pressure vessel 1 is transmitted to the skirt end via the cylindrical wall is transmitted as a shear force distribution, as shown in Figure 9. This results in a load distribution. As is clear from this distribution diagram, most of the load will be received by the reinforcing stay 12A that is perpendicular to the lifting direction in Fig. 6, and therefore it will be received by the bending rigidity, so a very large reinforcing stay 12A is required. . Furthermore, the seventh ~
In the third structure shown in FIG. 8, as described above, the cover plate 13 must be made of an extremely thick plate due to the shear force load distribution (see FIG. 8), making removal work extremely difficult. Moreover, 1/2 of the total weight of the pressure vessel is received by the shear force of the mounting bolts, and when used in a large pressure vessel 1 that weighs several tons, approximately several dozen large diameter bolts are required, making it difficult to remove them. This resulted in increased difficulty and danger of the work.

In addition, in the first and second structures, since the reinforcing members are joined together by welding, there is a disadvantage that cutting work is required separately at the installation site.

Furthermore, if the skirt of the pressure vessel 1 to which the second and third lug structures described above are applied is a miniskirt 1, the radial reinforcing stays 12 and cover plate 13 cannot be attached, so the structure shown in FIG. However, there is an inconvenience that the auxiliary skirt 5A must be added and applied. Additionally, the problem of shearing of bolts for refitting also arises.

[Purpose of the invention]

The present invention has focused on the above-mentioned conventional problems, and an object of the present invention is to provide a lightweight and simple-structured installation tool that can easily perform the installation work of a pressure vessel.

[Summary of the invention]

In order to achieve the above object, the pressure vessel installation tool according to the present invention includes a set ring that is fitted to the base plate of the skirt provided at the end of the pressure vessel, and a parallel set ring that is welded to one side of the cellar I-IJ song. The fixture has a main body consisting of a reinforcing beam, and the reinforcing beam is provided with an installation lug, and preferably the spacing between the reinforcing beams is 06 to 06 of the skirt diameter.
09 times binding, and the main body of the fixture can be bolted to base play 1~.

With the above configuration, for the transmitted load distribution of the pressure vessel's own weight,
By arranging reinforcing beams in parallel near the center of gravity at a distance of 06 to 0.9 times the skirt diameter, the load can be received by axial force, and the number of reinforcing members can be reduced. In addition, an IJ song is fitted into the inner surface of the base plate so that the load is transmitted to the reinforcing beam through this ring, so that no shearing force is applied to the set bolt.

[Embodiments of the invention]

Examples of the pressure vessel fixture according to the present invention are shown below.
This will be explained in detail with reference to FIG.

The fixture according to the embodiment includes a fixture main body 20 that is attached to a base plate 10 provided at the edge of the skirt 5 at the end of the pressure vessel, as shown. This fixture main body 20 has a set ring 2 fitted to the base plate 10.
1. The set ring 21 is a square cross-section member that runs along the inner peripheral surface of the base plate 10.
It is arranged concentrically in contact with the inner peripheral surface of the base plate 10.

Further, on one surface which becomes the outer end surface when such a set ring 21 is attached, a pair of parallel reinforcing beams 22 and a pair of parallel auxiliary beams 23 which are perpendicular to both reinforcing beams 22 are protruded. assembled and welded. The reinforcing beam 22 is an I-shaped steel placed equidistantly from the center of the set ring 21, and is set to a length that is longer than the chord length of the set ring 21 at the position where the reinforcing beam 22 is placed so that the extended end can be joined to the base plate 10. has been done. And the auxiliary beam 23
is a shaped steel having a smaller cross section than the reinforcing beam 22, and the extension ends are connected to each other to maintain the spacing between the reinforcing beams 22. These protruding beams 22 and 23 are integrated with the set ring 21 by fillet welding the edge of the contact surface. In the figure, 24 indicates a welded portion.

Here, the installation interval of the reinforcing beams 22 is the skirt 5
0.6 to 0.9 times the diameter d (L=o, 6d to 09d
) is set. This setting value is determined as follows. That is, referring to the shear force distribution diagram shown in Fig. 9, when the rotation angle is from the load supporting direction, the load W at each rotation angle position is W = w sin θ (where W is unit weight)...・・・・・・
(1), and if the total load ZW is considered only on one side, the total moment ΣM due to the shear force is as follows. However, ■t is the radius of the skirt.

From the above formula 〇)(3), the center of gravity distance t from the center is t-ΣM
/Σw−−1'4 ・・・・・・Song straight 4). Therefore, by arranging the reinforcing beam 22 at a distance t=π/4·d from the center, the shear load can be supported by the minimum moment arm, and the longitudinal direction of the reinforcing beam 22 is aligned with the direction in which the shear load is applied. This allows it to be supported by axial force. Since the shear load acts on the left sword wall, the reinforcing beam 22 is L = 2t, that is, T, - mutual d = o, 78
They can be effectively supported by arranging them in parallel at intervals of 5d.

In this case, although it is desirable that the position of the reinforcing beam 22 corresponds precisely to the center of gravity distance, a sufficient effect can be obtained even in the vicinity thereof. Therefore, as an allowable range that minimizes the moment arm as much as possible, the distance L=
It is sufficient to arrange it at 0.6d to 0.9d centered on 0.785d.

Next, pin support lugs 25 are provided at the longitudinal centers of the reinforcing beams 22 of the fixture body 20 described above.

This lug 25 is a protruding piece whose plate surface is aligned with the longitudinal direction of the beam 22, and is provided with a bottle hole 26 passing through the plate surface. The center line of the bottle hole 26 is set to pass through the center axis of the skirt 5, so that the pin 9 of the pedestal 8 shown in FIG. 2 can be attached thereto. In addition, reinforcement beam 2
2 is also provided with a bottom lug 27 at one end, so that it can also be used for two-point hanging work.

The fixture main body 2o provided with the above-mentioned lugs 25 is to be attached to the pressure vessel during installation work, and for this attachment, the extension end facing the base plate 10 of the reinforcing beam 22 is connected with bolts 28. I have to. Two bolts 28 are used at each end, for a total of eight bolts 28.

The operation of the lug structure according to such a configuration is as follows.

First, the skirt 5 provided on the lower end side of the pressure vessel in the horizontal position
On the other hand, when the set ring 21 is fitted, it is installed in the base plate 10, and the end of the reinforcing beam 22 contacts the base plate 10 to reach the set position, and the bolt 28 is tightened to complete the set. Then, the pressure vessel is erected by the method shown in FIG. 1 or 2, but at this time, a shearing force distribution as shown in FIG. 9 acts on the skirt end due to its own weight. However, this effect is prevented by the reinforcement beam 22 placed at the center of gravity of the shear force distribution along the direction of the lifting load.
Most of it is received by axial force. Therefore, along with minimizing the moment arm, the number of such reinforcing members can be reduced. At this time, the load is transmitted to the reinforcing beam 22 through the set ring 21 on the inner surface of the base plate 10, and is not transmitted to the set bolt 28. Therefore, since no shearing force is applied to the bolts 28, it is only necessary to set the fixture main body 20, and bolts with a small cross section can be used, and the number of bolts used can be reduced.

Further, according to the above structure, the reinforcing beam 22 is assembled in a ridge shape and is located on the outer surface side of the base plate 10, so even if the skirt 5 is a mini-skirt as shown in FIG. 10, it can be reliably attached. Installation work can be done without using the auxiliary skirt 5A. In addition, since the number of set bolts 28 is small, there is an advantage that attachment and detachment work to the skirt 5 can be performed quickly.

Next, an example of use of the above fixture is shown in FIG. 13.

This is an example applied when it is desired to suspend the skirt side at one point due to the relationship with a crane or other circumstances. Separately prepare a hanging beam 30 provided with a bracket 29 that can be connected to the bottom lugs 27 provided at the ends of the pair of reinforcing beams 22,
A lug 31 may be provided at the center of the beam 30 to perform the hanging operation.

Further, FIG. 14 shows a modification of the fixture for hanging at one point. This eliminates the bottom lug 27, and instead provides a chevron-shaped beam 32 between the ends of both reinforcing beams 22, and the beam 3
A hanging lug 33 is provided at the top of 2. It is clear that this example can also be hung from one point as in the previous example, and has the same advantages as the structure shown in FIGS. 11-12.

〔Effect of the invention〕

＼ As described above, according to the present invention, it is possible to support near the center of gravity of the load distribution at the skirt end due to the vessel's own weight when installing the pressure vessel, and to receive most of the load by axial force, reducing the weight of the reinforcing member and reducing the work load. This has the excellent effect of simplifying the process.

[Brief explanation of the drawing]

Figure 1 is a side view showing a two-point suspension method for pressure vessel installation work, Figure 2 is a side view showing another method using pin support, Figure 3 is a front view showing a conventional lug reinforcement structure, and Figure 4 is a side view showing a method using two-point suspension for pressure vessel installation work. 5 is a front view showing a lug reinforcing structure according to another conventional example, FIG. 6 is a side view thereof, and FIG. 7 is a side view showing a lug reinforcing structure according to another conventional example. , Figure 8 is a front view of the same,
Figure 9 is a shear force distribution diagram, Figure 10 is the auxiliary snow J-1-
FIG. 11 is a partially sectional side view of the fixture according to the embodiment of the present invention, FIG. 12 is a front view of the same, and FIG.
FIG. 3 is a front view showing a modified usage example, and FIG. 14 is a front view showing another embodiment. 1・・・・・・・・・Pressure vessel, 5・・・・・・・・・
Skirt, 10...Base plate, 2
0...... Fixture body, 21...
...Set ring, 22...Reinforcement beam, 25...Pin support lug, 27...
...Bottom rug. Agent Tatsu Unuma Figure 7 Figure 8 E"W= f',,"wsinθd9 $II Figure 121 Comic■

Claims (3)

[Claims] (1) It has a fixture body consisting of a set ring that fits onto the base plate of the skirt provided at the end of the pressure vessel, and a parallel reinforcing beam welded to one side of the set ring, and is installed on the reinforcing beam. A pressure vessel installation tool characterized by being provided with a lug. (2) The distance between the reinforcement beams is 0.6 to 0 of the skirt diameter.
．． The pressure vessel fixture according to claim 1, wherein the pressure vessel fixture is nine times as large. (3) The pressure vessel fixture according to claim 1, wherein the fixture main body can be bolted onto a base plate.