JP2002004811A - Method for effecting periodic inspection of plant having level-holding mechanism for spring support frame and the spring support frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for effecting periodic inspection of a plant, having a level holding mechanism for a spring support frame and the spring support frame capable of preventing a stress from applying on mechanical equipment, such as piping, during periodic inspection. SOLUTION: A spring unit 3, interposed between a beam member flange 2a of gas turbine equipment and a frame 5, is formed such that upper and lower plates 11a and 11b are supported vertically movably inserted through a plurality of through- bolts 10 inserted through between the frame 5 and a beam member flange 2a, and a plurality of compression coil springs 12 are interposed between the upper and lower plates 11a and 11b. The upper plate 11a makes contact with the under surface of the frame 5 via a spacer 13a and the lower plate 11b makes contact with the surface of the bam member flange 2a via a spacer 13b. A first nut 14 is threadedly engaged with the through-bolt 10, extending between the frame 5 and the upper plate 11a, a second nut 14b is threadedly engaged with the through-bolt 10, extending between the lower plate 11b and the beam member flange 2a, and a third nut 14c is threadedly engaged, with the through-bolt 10 situated below the beam member flange 2a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for maintaining a level of a spring supporting base in a steam turbine or a gas turbine plant, and a method for regular inspection of the plant.

[0002]

2. Description of the Related Art A gas turbine in which air and fuel compressed by a compressor are combusted by a combustor to drive a turbine, and a gas turbine for driving the gas turbine Recognized that the so-called combined plant is the mainstream until the next new energy development, in which power is generated by combining with a steam turbine driven by steam generated by the energy of the combustion gas discharged In the future, how to improve the annual operation rate of these plants is an important issue at present between manufacturers and users.

[0003] As one of measures for improving the annual operation rate of these plants, shortening of a period of a periodic inspection (hereinafter referred to as a regular inspection) has been studied. In other words, frequent maintenance and inspection of the plant, timely replacement of parts, etc., to prevent the occurrence of large accidents, etc., and significantly reduce the time required for large-scale Investigations for improving the quality have been made.

[0004] Incidentally, the gas turbine, the generator, and the like in the plant are installed on a so-called spring support base which is supported as a vibration-proof structure against earthquakes or the like via a spring unit or an oil damper to a beam member of a building. You.

[0005] Therefore, when heavy objects such as the turbine rotor and the turbine enclosure (outer garment) are removed from the spring support gantry during the above-mentioned regular inspection, the spring support gantry is lifted by the spring force of the spring unit, and the building or the like (fixedly provided) However, since the relative position with respect to the installed facilities changes, there is a problem that a load (stress) is applied to a pipe or the like provided over the building or the like and the spring support base.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has a level support mechanism for a spring support base and a spring support base that can prevent stress on piping and other equipment during regular inspection. An object of the present invention is to provide a regular inspection method for a plant.

[0007]

According to the present invention, there is provided a method for inspecting a plant provided with a spring supporting gantry according to the present invention, wherein the gantry is supported on a base material via a spring unit. At the time of the regular inspection, the operation of the spring unit of the spring unit on the extension side of the spring is regulated before the regular inspection work is performed, and the regulation is released after the regular inspection work.

[0008] A level holding mechanism for a spring supporting gantry according to the present invention, in a plant in which a gantry is supported on a base material via a spring unit, a plurality of through bolts having the spring unit inserted through the base material and the gantry. A nut capable of restricting the operation of the spring unit of the spring unit on the extension side is screwed onto the through bolt.

Further, in a plant in which a gantry is supported on a base material via a spring unit, the level holding mechanism of the spring support gantry of the present invention is provided between the base material side and the gantry side. It is characterized by interposing a hydraulic jack that can regulate the operation on the extension side.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a spring supporting frame according to an embodiment of the present invention;

[First Embodiment] [Configuration] FIG. 1 is a perspective view schematically showing the configuration of a gas turbine system according to a first embodiment of the present invention, and FIG. 2 is a front view of the same spring unit. ) Indicates the operation of the turbine, and FIG. 2B shows the time of regular turbine inspection.

As shown in FIG. 1, a gantry (spring support gantry) 5 is provided in a building 1 of a gas turbine facility via a plurality of spring units 3 and oil dampers 4 with respect to a beam member (base material) 2. It is elastically supported at substantially the same level as the work floor 6, and a gas turbine 7 and a generator 8 are installed on the gantry 5.

As shown in FIG. 2, the spring unit 3 includes an upper plate 11a and a lower plate 11b, each of which has a plurality of through bolts 10 inserted between the gantry 5 and the flange 2a of the beam member 2. A plurality of compression coil springs 12 are interposed between the upper plate 11a and the lower plate 11b so as to be vertically movable.

The upper plate 11a includes a spacer 13a
The lower plate 11b is in contact with the flange 2a surface of the beam member 2 via a spacer 13b.

A first nut 14a is screwed onto the through bolt 10 between the base 5 and the upper plate 11a,
A second nut 14b is screwed onto a through bolt 10 between the lower plate 11b and the flange 2a of the beam member 2, and a through bolt 10 below the flange 2a of the beam member 2.
The third nut 14c is screwed on the upper side.

[Operation] With this configuration, during the operation of the turbine, the first nut 14a to the third nut 14a
c is positioned at the position shown in FIG. That is, the first nut 14a is screwed up from the upper plate 11a by a predetermined dimension (for example, 20 mm), and the second nut 14b is screwed down until it comes into close contact with the upper surface of the flange 2a of the beam member 2. Further, the third nut 14c is separated from the lower surface of the flange 2a of the beam member 2 by 2 to 3 mm.

As a result, the upper plate 11a and the lower plate 11b carrying the compression coil spring 12 can freely move on the through bolt 10, and the vibration caused by the relative displacement between the gantry 5 and the beam member 2 is reduced by the compression coil spring 12. Can be absorbed.

On the other hand, at the time of regular inspection, the first nut 14a to the third nut 14c are positioned at the positions shown in FIG. That is, the first nut 14a is tightened (screw down) to a position 2 to 3 mm from the upper plate 11a, and the second nut 14b is tightened to 2 to 3 mm from the lower plate 11a.
m (screw up). Further, the third nut 14c is brought into close contact with the lower surface of the flange 2a of the beam member 2.

As a result, heavy objects such as a turbine rotor and a turbine enclosure (outer garment) are mounted on the gantry 5 for regular inspection.
Even if removed, the movement of the upper plate 11a and the lower plate 11b carrying the compression coil spring 12 in directions away from each other due to the extension of the compression coil spring 12 is prevented by the first nut 14a and the second nut 14b. Because the extension operation of the compression coil spring 12 is locked (restricted), the gantry 5 is not lifted by the spring force of the compression coil spring 12.

As a result, due to a change in the relative position of the gantry 5 to the building 1 or the like (fixedly provided facility side), the building 1
A burden (stress) is applied to the equipment such as the piping provided over the base and the gantry 5 to avoid damage.

[Second Embodiment] [Configuration] FIG. 3 is a front view of a spring unit showing a second embodiment of the present invention.

The upper and lower spring receivers 20a and 20b for supporting the compression coil spring 12 in the first embodiment
A hydraulic jack 21 is interposed between the hydraulic jack 2 and the hydraulic jack 2.
1 is connected to the lower spring receiver 20b while the piston rod 21b is connected to the upper spring receiver 2b.
In this example, the hydraulic jack 21 is operated to the contraction side at the time of regular inspection to lock the extension operation of the compression coil spring 12. On the other hand, during the turbine operation, the oil chamber of the hydraulic jack 21 is opened to the drain side, and the expansion and contraction operation of the compression coil spring 12 is allowed.

[Operation] In this embodiment, the same operation and effects as those of the first embodiment can be obtained.

The present invention is not limited to the above embodiments,
It goes without saying that various changes can be made without departing from the spirit of the present invention.

[0025]

As described in detail above, the method for inspecting a plant provided with a spring supporting gantry according to the first aspect of the present invention is a method for detecting a plant having a gantry supported on a base material via a spring unit. In the inspection method, at the time of the regular inspection, the operation of the extension side of the spring of the spring unit is regulated, the regular inspection is performed, and the regulation is released after the regular inspection. Therefore, at the time of regular inspection, the gantry is prevented from being lifted by the spring force, and it is possible to avoid applying stress to the pipes and the like provided over the base material side and the gantry side.

According to a second aspect of the present invention, there is provided a level holding mechanism for a spring supporting gantry, wherein the spring unit is inserted through the base and the gantry in a plant where the gantry is supported on the base via a spring unit. It is provided on a plurality of through bolts, and a nut capable of restricting the operation of the spring of the spring unit on the extension side is screwed onto the through bolts,
The same effect as that of the first aspect can be obtained.

According to a third aspect of the present invention, there is provided a level holding mechanism for a spring supporting gantry, wherein the spring unit is provided between the substrate side and the gantry side in a plant where the gantry is supported on a substrate via a spring unit. Since the hydraulic jack capable of restricting the operation of the extension of the spring is interposed, the same effect as that of the first aspect can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration perspective view of gas turbine equipment showing a first embodiment of the present invention.

FIGS. 2A and 2B are front views of the spring unit, and FIG. 2A shows a turbine operation and FIG. 2B shows a turbine regular inspection.

FIG. 3 is a front view of a spring unit according to a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 building 2 beam member 3 spring unit 4 oil damper 5 gantry 6 work floor 7 gas turbine 8 generator 10 through bolt 11a upper plate 11b lower plate 12 compression coil spring 13a, 13b spacer 14a first nut 14b second nut 14c third Nut 21 Hydraulic jack

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16M 7/00 F16M 7/00 W (72) Inventor Yoshiyuki Itai 2-1-1, Araimachi Shinama, Takasago City, Hyogo Prefecture No. Within the Mitsubishi Heavy Industries, Ltd. Takasago Works (72) Inventor Makoto Tachibana 2-1-1, Niihama, Araimachi, Takasago City, Hyogo Prefecture Inside the Takasago Works, Mitsubishi Heavy Industries, Ltd.

Claims (3)

[Claims] An inspection method for a plant in which a gantry is supported on a base material via a spring unit, wherein in the inspection, the operation of the extension side of the spring of the spring unit is restricted before the inspection. A method for performing a regular inspection of a plant comprising a spring support base, wherein the inspection is performed and the regulation is released after the regular inspection. 2. In a plant in which a gantry is supported on a base material via a spring unit, the spring unit is provided on a plurality of through bolts inserted through the base material and the gantry. A level holding mechanism for a spring support base, wherein a nut capable of restricting the operation of the spring unit on the extension side of the spring is screwed. 3. In a plant in which a gantry is supported on a base material via a spring unit, a hydraulic jack is provided between the base material side and the gantry side, the hydraulic jack being capable of restricting the operation of the spring of the spring unit on the extension side. A level holding mechanism for a spring support base, wherein the level holding mechanism is mounted.