JPH067245Y2 - Exterior structure on the top of the duct - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) [0001] The present invention relates to a duct structure, and more particularly to an exterior structure of a duct upper surface suitable for labor saving of welding work and simplification of on-site matching work in duct manufacturing.

(Prior Art) Conventionally, in a duct for transporting gas such as air and gas, the duct upper surface structure having seats for various nozzles penetrating the duct surface has a partial plan view and a fifth plan view shown in FIG. As shown in the partial sectional view in the figure, it has a large welded structure and is molded at the factory. That is, the longitudinal support beam 3 supported by the support tube 2 provided on the upper surface plate 1 of the duct body is covered with the casing including the exterior material 4 and the reinforcing plate 5. Although the reinforcing plate 5 is mainly arranged in a large number of rows in a direction perpendicular to the longitudinal support beam 3, it is also arranged in a direction parallel to the longitudinal support beam 3 in order to reinforce a portion penetrated by a tubular hollow body such as various nozzle seats. There is. Arrow A indicates the gas passage direction (longitudinal direction).

(Problems to be Solved by the Invention) As described above, in the conventional technology, the consideration for welding work and on-site alignment work is insufficient, and the number of welding points between the exterior material 4 and the reinforcing plate 5 is extremely large, and the welding distance is large. In addition, since the reinforcing plate 5 is welded to the exterior material 4 from both sides, fillet welding is likely to occur, and welding strain is likely to occur, which requires a great deal of manpower and time, is inefficient, and impairs economic efficiency. Has become a factor. In addition, since it is integrally molded as a large-scale structure in the factory, there is a problem that a lot of labor is required for the work of matching with the surrounding joint portion at the time of on-site installation. SUMMARY OF THE INVENTION The present invention is intended to solve the above problems, and in short, it is an object of the present invention to provide an exterior structure on the upper surface of a duct, which simplifies welding work and on-site alignment work in a factory and is suitable for improving economy.

(Means for Solving the Problems) The above-mentioned object is to make a casing on the upper surface of a duct having a large welded structure into a small portion mainly composed of an exterior material having a U-shaped cross section and a cover having an inverted U-shaped cross section. This is achieved by adopting a divided structure.

(Operation) With the above configuration, the reinforcing plate conventionally provided for reinforcing the exterior material becomes unnecessary, and as a result, the welding of the exterior material and the reinforcing plate is not required, so that a large amount of welding strain required for removing the welding distortion is eliminated. It is possible to save manpower and time.

Embodiment An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a duct upper surface exterior showing a most preferred embodiment of the present invention, in which the same reference numerals as those in the prior art indicate the same functional items, and an arrow A indicates a gas flow direction (longitudinal direction). Show. The width direction means a direction perpendicular to the longitudinal direction. The exterior material of the duct that supplies the air for the combustion plate to the boiler furnace is roughly classified into two different structures. One is a penetrating portion by an instrumentation nozzle seat 10 for performing various kinds of sampling as shown in the cross section shown in FIG. 2, and the other is a penetrating portion as described above as shown in the cross section shown in FIG. It is a part that does not have. Both of them are provided on top of a plurality of rows of longitudinal support beams 3 running in parallel and supported by a support tube 2 provided on the upper surface 1 of the duct main body, and the deck plate 6 is provided in the widthwise portion except for the periphery of the nozzle seat 10. The deck cover 7 is provided to cover the upper part of the structure.

The essence of the present invention is particularly related to the structure of the penetrating portion by the nozzle seat 10 and its surroundings, in which the longitudinal support beam 3 is provided.
A casing 8 having a U-shaped cross section in the longitudinal direction is arranged at an upper portion of the nozzle at a right angle to the longitudinal support beam 3, and a cylindrical cover 11 is welded to a penetrating portion of the nozzle seat 10 to form a cylindrical casing 8 on the casing 8. 9 is provided to face each other to prevent rain from entering. Further, a cover 12 having a reverse U-shaped cross section in the longitudinal direction is provided in a portion where the exterior material 8 and the exterior material 8 are adjacent to each other so as to cover the mutual gap, and is directly fixed to the longitudinal support beam 3 by a J bolt 13 and a nut. It makes the rainy season more complete. This structure can eliminate the welding of the exterior material and the reinforcing plate in the conventional structure without impairing the conventional functions, reducing the welding work during manufacturing in the factory and the labor for removing welding distortion, and the adjustment during the on-site installation. The work can be shortened.

(Effects of the device) By implementing the present invention, the remarkable reduction of the welding length in the factory enables labor saving of welding work, reduction of welding strain removal work, and simplification of on-site matching work. Is played.

[Brief description of drawings]

1 is a plan view showing an embodiment of a duct upper surface exterior structure according to the present invention, FIG. 2 is a sectional view taken along the line BB of FIG. 1, and FIG. 3 is a line CC of FIG. FIG. 4 is a plan view of the top surface of the duct of the prior art, and FIG. 5 is a cross-sectional view of FIG. 1 ... Duct body upper surface, 2 ... Support tube 3 ... Longitudinal support beam, 6 ... Deck plate 7 ... Deck cover, 8 ... Exterior material 9 ... Cylindrical exterior material, 10 ... Nozzle seat 11 ... … Cylindrical cover, 12 …… Cover 13 …… J bolt

Claims (1)

[Scope of utility model registration request] 1. A plurality of support tubes standing upright on a duct upper surface plate, a plurality of longitudinal support beams supported by the support tubes, a casing covering the longitudinal support beams, and a part of the casing. In the exterior structure of the duct upper surface having a tubular hollow body, the casing has an exterior material having a U-shaped longitudinal cross section, and an inverted U-shaped longitudinal cross section provided in the exterior material and an adjacent portion of the exterior material. A cover having, a deck cover covering both ends of the exterior material in the longitudinal direction, a J-bolt for fixing the exterior material to the longitudinal support beam together with the cover and the deck cover, and a U-shaped cover penetrating the cover. An exterior structure on the upper surface of the duct, comprising: a cylindrical exterior material that surrounds the outer periphery of the tubular hollow body; and an inverted U-shaped cover that covers an upper portion of the cylindrical exterior material.