JPS633100B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a large diameter wind pipe having a diameter of 600 to 1200 mm, which is used for construction and civil engineering works such as tunnel construction.

This type of wind pipe uses a spiral pipe made of a metal plate such as a galvanized iron plate. Therefore, not only is the manufacturing cost high, but also the transportation and storage costs are considerable, and since the substance is actually air, the space is also expensive.

In view of the current situation, it would be extremely beneficial to form the pipe at the construction site in order to reduce the above-mentioned waste.

The present invention has been devised to meet this demand, and as shown in Fig. 1, a required number of reinforcing ribs 2 with a height of several mm are provided on a metal plate M having a width that forms a pipe body with a required diameter. . An abutting edge 3 when the metal plate M is rolled into a cylindrical shape is provided by bending the metal plate M or bonding an L-shaped abutting edge made of the same material to the metal plate M. For example, a 3 mm thick malt plane 4 is attached to the butt edge 2 to form a seal.

The metal plate M is rolled up using the annular reinforcing angle 5 shown in FIG. 2 as a mold so that the abutting edges 3, 3 are on the inside.

Connect the butting edges 3, 3 at least in three places, the center and both ends, to the hook metal fittings 6a and bolts 6 shown in the third figure.
Fix it with the clip 6 consisting of b as shown in Fig. 4.

The annular reinforcing angle 5 shown in FIG. 2 is manufactured in a factory to the outside diameter of the rounded cylindrical tube 1 as described above, and has butt edges 5a provided at the cuts, at least three locations along the length of the cylindrical tube 1. Insert bolt 7 and nut 8
Tighten with.

The thus assembled cylindrical tubes are butted together as shown in FIG. 7, and a band 9 is wrapped around the outer surface of the butted portion 1b. The band 9 is divided into two parts as shown in FIG. 8, and a 10 mm thick maltplane is pasted on the inner surface to form a gasket 10 to prevent air leakage from the abutting portion 1b. Numeral 11 is a tightening bolt for the bands 9,9.

The stay bolts 12 are passed through the bolt holes 5C of the reinforcing angles 5 close to the bands 9 of both cylindrical tubes 1, 1, and are tightened with nuts 13 to connect them.

It goes without saying that spring washers, lock nuts, etc. may be used in the tightening portions of the bolts and nuts to prevent them from loosening.

Since the wind pipe of the present invention has the above-mentioned configuration, it is only necessary to transport the galvanized iron plate and the assembly accessories to the site, thereby significantly reducing transportation costs and storage space.
Forming and assembling these parts into a wind pipe does not require a professional engineer, so even large diameter pipes can be easily assembled. It also has the advantage of being able to be dismantled and reused.

[Brief explanation of the drawing]

Fig. 1 is a raw material plate for the wind pipe of the present invention, Fig. 2 is a perspective view of an annular reinforcing angle, Fig. 3 is a front view of an assembly clip, Figs. 4 to 6 are assembly process diagrams of a cylindrical pipe, Fig. 7 is a front view of a connecting portion of two cylindrical tubes, Fig. 8 is a perspective view of a connecting band, and Fig. 9 is a perspective view of the product. M is the material plate, 1 is the cylindrical tube, 3 is the butt edge, 4
is a packing, 5 is a reinforced angle ring, 6 is a clip, 9 is a connecting band, and 12 is a stay bolt.

Claims (1)

[Claims] 1. Roll a material plate on which multiple reinforcing ribs are formed into a cylindrical shape, fasten the inward facing edges with clips at several locations with gaskets interposed, and fit annular reinforcing angles at several locations along the length of the outer circumference of the cylindrical tube. Tighten the butt edges with bolts, butt the cylindrical tubes assembled as above, wrap a band with a packing attached to the outer surface of the butt part, tighten the butt edges of the band with bolts, and then tighten both cylinders. A wind pipe in which reinforcing angles close to the pipe band are connected with stay bolts.