The embodiments of the present invention are described below with reference to the accompanying drawings.
Inside of boiler main body 1, a second and third super-heater 5, a reheater 6, a primary super-heater 7, an economizer 8 are placed; and the lower parts of the re-heater 6 and the economizer 8 are formed to be an eco-hopper 9. Plural of wind boxes 10 are arranged to a furnace wall of the boiler main body 1. A left area 11 of the boiler frame 2 is the area where coal bunker is positioned.
The area below the eco-hopper 9 is assumed as a cage part 12. Until installation of various equipments such as a re-heater 6, a primary super-heater 7, a economizer 8, and an eco-hopper 9 are completed, a lifting root R of the each equipment block is kept clear without attaching a floor to the cage part 12.
And after the installation of the each equipment is completed, multiple levels of floors 13 (13A, 13B, 13C, and 13D) are built in a position shown with a 2 dotted line in the cage part 12.
In other words, a jack base 16 is provided temporarily in each of four top corners; and a jack 14 is set to this jack base 16. The jack 14 is the center-hole type jack, and it lifts up and down the mid-ship part of the main body with a suspension cable by hydraulic pressure activation mechanism.
As a lifting frame is made in a plane U-shaped type, authorized personnel and service vehicles can easily access in and out from an open side of the U-shaped type. Thus, the efficient building operation for the floor 13 can be achieved by installing the floor member parts start from the back side of the U-shape and end at the open side of the U-shape sequentially.
It should be noted that the level adjustment is easy when there is an irregularity in the underside of the floor 13 as the floor 13 is built on the lifting frame 18 through the columns 28. It should be notes that the adjustment level can easily be manipulated when there is an irregularity in the underside of the floor 13, as the floor 13 is built on the lifting frame 18 through the columns 28.
Furthermore, the strength of disengaging part of the U-shaped type lifting frame 18 is reinforced indirectly by the beam member of a built floor 18. Thus, even if the cross members 18A and the bottom member 18B forming the lifting frame 18 have a minimum section modulus or thin members are used, the lifting frame is strong enough against the suspension loads.
A block of single floor 13 is built on the lifting frame 18 on ground; and each floor is jacked up with the lifting frame 18 and installed to the designated position.
In other words, after having locked the lower end of the each suspension cable 38 that is hanging down from four jacks 14 stationed on a top of first area 12A to a lifting lug 20 of the lifting frame 18, the four jacks 14 is operated in synchronism for jacking up the floor 13 together with the lifting frame 18.
It is desirable that a horizontal sensor is placed on the floor 13, and the synchronizing control of the four jacks 14 are conducted with the output signal of the level sensor so that the floor 13 keeps its level. Also, when jack 14 is a hydrostatic drive-type jack, it is desirable that synchronizing control feeds oil from the common hydraulic pump (not shown) so as to make the jack stroke of each jack 14 become same as other jacks 14.
Initially, the lifting frame 18 is engaged with the suspension cable 38 hanging down from the jack 14 as illustrated in
When the installation of floor 13A is completed, the lifting frame 18 is freed from the floor 13A and jacked down as illustrated in
At first the lifting frame 18 in the empty condition is returned to the ground as shown in
Next, as shown in
It should be noted that it is necessary to secure the passage line of each suspension cable 38 hanging down from four jacks 14 respectively through the jack-up operation. For achieving this goal, each floor 13 is assembled and jacked up with partial cut-aways 40A, 40B, 40C and 40D so as to secure the passage lines of the suspension cables 38 as shown in
And after all floors 13 are attached to the designated floor height, and having removed four jacks 14, partial cut-aways 40A, 40B, 40C and 40D of each floor 13 are put back to normal condition.
At first, a jack mechanism is set to a top of the first area 12A among the cage part 12 as indicated in
When the construction of the floor at first area 12A is finished, a jack mechanism is moved and relocated to a top of the second area 12B.
And a floor of plural floors in the second area 12B is built from the upper floor in order of the floor 13A, the floor 13B, the floor 13C and the floor 13D; that is from the highest floor to the lower floor. According to the construction method of the boiler cage part floor of the present embodiment, even in the condition where the usage of the crane after installation of the eco-hopper 9 is in a difficult situation, floors 13 in a shape of blocks can be attached easily, which contributes the reduction of the construction cost and the shortening the construction period.
In the above embodiment, it is described that the first part of the cage is divided into the first area 12A and the second area 12B, and the respective floors 13 are built separately. However, as for the present invention, by the entire floor may be built as a whole, without being limited to the embodiment.
Additionally, it is described in the embodiment that each floor 13 is built on lifting frame 18 through multiple columns 28. However, according to the present invention, the floor 13 may be built on the lifting frame 18 directly without being limited to the embodiment.
Furthermore, as a jack mechanism, the usage of the center hole type jack 14 is explained. However, the jack mechanism to be used in the present invention can be various measures without being limited to it; for example, a mechanism using the winch mechanism is also included in the scope of present invention.
While there have been described herein what are considered to be preferred and exemplary embodiments of the present invention, other modifications of the invention shall be apparent to those skilled in the art from the teachings herein and, it is therefore, desired to be secured in the appended claims all such modifications as fall within the true spirit and scope of the invention. Accordingly, what is desired to be secured by Letters Patent of the United States is the invention as defined and differentiated in the following claims.
Number | Date | Country | Kind |
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2006-212384 | Aug 2006 | JP | national |