JPH0327119Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Field of industrial application) This invention relates to wind pipes and is used in tunnel construction.

(Prior Art) In tunnel construction, wind pipes are used to blow air into the tunnel. This wind pipe is required to be easy to transport, easy to assemble and disassemble on-site, and reusable.

A conventional wind pipe is known in which joints are provided on both sides of a bendable flat plate, the joints are joined together to form a tubular shape, and a shape-retaining band is wrapped around the outer periphery.

(Problems to be Solved) Since the conventional wind pipe is made into a tubular shape by curving a flat plate on site, a relatively large space is required for assembly. In addition, since it must be able to be bent manually, there are major restrictions on the material, and the number of parts is large.

(Means for solving the problem) This idea consists of two plate bodies each having an arc-shaped cross section, each having a concave-convex fitting portion on both side edges and an arcuate band attached to the outside. The plates are fitted together to form a tubular shape, and the bands of both plates are tightened and fixed together via a connecting device.

The material of the arcuate plate may be an aluminum alloy plate, a composite plate of aluminum and synthetic resin, a galvanized iron plate, etc., but the first two are preferred since they are free from sparks.

The connecting device may include two fixing members each having a hooking portion with the arcuate band, and a bolt and nut that connect the two fixing members, or a connecting device protruding from the end of the band. One conceivable configuration is a connecting protrusion and a bolt and nut fixed to the connecting protrusion. The specific structure thereof is not limited to the one shown in the following embodiments and other bolts and nuts, and any known connection structure may be used.

(Operation of the invention) The wind pipe of this invention can be assembled on-site, and can be easily assembled by fitting two arc-shaped plates together and tightening and fixing them with a connecting device.
Since the plate body is pre-shaped into an arc shape, there is no need for on-site bending, and assembly is possible in a relatively narrow space.

Examples of this invention will be described below with reference to the drawings.

(Example) On both sides of the arc-shaped plates 1 and 1a, which are combined to form a circular pipe, protrusions 2 or grooves 3 for fitting are provided in succession. Ha Patsuking 4
is installed. Further, arc-shaped bands 5, 5a are fixed to predetermined positions (1/3 of the length in the figure) of the plates 1, 1a by rivets or the like. The bands 5, 5a have a rectangular cross section, and are provided with latching holes 6, 6a for latching the coupling device in the upper end wall thereof.

The connecting device 7 is composed of fixing members 9, 9a having hooks 8, 8a that are hooked into the hooking holes 6 or 6a, a bolt 10, and a wing nut 11, and the base end of the bolt 10 is connected to one side. It is rotatably attached to a fixed member 9 via a shaft 12, and the other fixed member 9
A groove 13 for inserting the bolt 10 is provided in the upper part of a. In the figure, reference numerals 14 and 14a are skirts extending downward from the fixing members 9 and 9a, and are fitted onto the bands 5 and 5a to enhance the stability of the fixing members.

Both plates 1 and 1a are tightly fixed by the connecting device 7 to form a wind pipe 15. That is, the hook portion 8 of the fixing member 9 is hooked to the hook hole 6 of one plate body 1, and the hook portion 8a of the fixing member 9a is hooked to the hook hole 6a of the other plate body 1a, and the fixation is performed. By rotating the bolt 10 attached to the member 9, fitting it into the groove 13 of the hooking member 9a, and tightening the wing nut 11, both plates are tightly fixed.

According to the connecting device 7 shown above, since the bolt 10 is attached to the fixing member 9 in advance, there is no need to handle the bolt as a separate component, and workability is improved, but as shown in FIGS. 5 and 6, Alternatively, bolt insertion holes may be provided in both fixing members 9, 9a, and the bolts 10a may be inserted and fixed into the bolt insertion holes.

Further, in place of the hooking members 9, 9a, bolt attachment members may be provided integrally protruding from the bands 5, 5a, similar to the connection section between wind pipes shown below.

Arc-shaped connecting bands 1 are provided at both ends of the plates 1 and 1a for connecting with the adjacent wind pipes 15a, respectively.
6, 16a are installed. The connecting band 1
6 and 16a are provided with a groove on the lower side, and a packing 25 is attached to the groove.

The connection structure of the wind pipes 15, 15a is shown below.
That is, the connecting bands 16, 16a of the wind pipes 15, 15a to be connected are in contact with each other, and the hat caps 17, 17a each having a trapezoidal cross section are fitted onto the upper portions of the connecting bands 16, 16a. The two hat caps 17, 17a are arcuate so as to form an annular shape, and both ends thereof are connected by a connecting device 18. The connecting device 18
A bolt attachment member 19 is provided protruding from one of the hat caps 17, and the base of a bolt 21 is attached to the bolt attachment member 19 by a shaft 20, and a groove 22 is formed upwardly at the end of the other hat cap 17a. A bolt receiving member 23 is provided, and the bolt 21 is inserted into the groove 22 and tightened with a wing nut 24.

If the wing nut 24 is strongly tightened at the above-mentioned connection part, a force is applied to the hat caps 17, 17a in the direction of the center of the wind pipe, and the hat caps 17, 17
The inner surface of a and the outer surface of the connecting bands 16, 16a are in close contact with each other, and airtightness of the connecting portion is obtained.

Incidentally, the above-mentioned connecting device may also be configured by inserting and fixing a bolt as shown in FIG.

(Effects of the invention) According to this invention, since the wind pipe is constructed by combining two arc-shaped plates, there is no need to curve-form the plates on site, and the assembly work is easy.
Since there is no need to manually bend the plate, there are no restrictions on the material or steel of the plate, making it possible to obtain a strong wind pipe.Also, since the work space is small, it can be assembled inside a tunnel. It is possible.

Next, since the band is attached to the plate in advance, the strength is improved and the number of parts is reduced.Furthermore, if it is fixed with a wing nut, it can be assembled and disassembled without using any tools such as spanners or screwdrivers. can do.

Furthermore, since the plates are arcuate, multiple plates can be stacked upon disassembly, allowing for transportation and storage in a small volume.

[Brief explanation of drawings]

Fig. 1 is a front view of the embodiment of this invention, Fig. 2 is a sectional view, Fig. 3 is an enlarged side sectional view of the connecting portion, Fig. 4 is an enlarged front sectional view, and Fig. 5 is a sectional view of the connecting device. FIG. 6 is an enlarged front sectional view of another embodiment, FIG. 7 is an enlarged side sectional view of the connecting portion of the wind pipe, and FIG. 8 is an enlarged front sectional view. 1, 1a...Plate body, 2...Convex strip, 3...Concave groove,
5, 5a...Band, 6,6a...Latching hole, 7...
...Connection device, 9, 9a...Fixing member, 16, 16
a... Connecting band, 17, 17a... Hat cap, 18... Connecting device.

Claims (1)

[Claims for Utility Model Registration] 1. Two plate bodies each having an arcuate cross-section, each having a concave-convex fitting portion on both side edges and an arc-shaped band attached to the outside, are made into a tubular shape by fitting the concave-convex fitting portions together. A wind pipe in which the bands of both plate bodies are tightly fixed together via a connecting device. 2. The wind pipe according to claim 1 of the utility model registration claim, in which the band has a rectangular cross section. 3. The wind pipe according to claim 1, wherein the connecting device is constituted by two fixing members having hooking parts with the band, and a bolt and nut that connect the two fixing members. 4. The wind pipe according to claim 3, wherein the base end of the bolt is rotatably attached to one of the fixing members.