JPS59190590A - Spiral duct - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to civil engineering work and construction work such as road work, etc.
Related to the structure of spiral ducts used for air supply, temporary drainage, etc. installed at construction sites.

Conventionally, when assembling and connecting spiral ducts, a spiral pipe was created by winding a relatively narrow tin plate in a spiral shape, and the spiral pipes were connected using Nisoturu and flanges between each spiral pipe. A duct was used, and each spiral pipe was suspended and supported from the ceiling or the like by a plurality of support rings.

In addition, recently, shrinkable connection tightening tapes made of heat-softening resin have been developed, and these tapes can be wound and tightened to prevent air or water leaks in the connection areas and can be used in field work. Became.

However, even in a duct with such a structure, since the support ring suspends the middle of each spiral pipe (2), it is difficult to support each spiral pipe in a straight line, and the connecting part is bent, causing misalignment. There are problems in that the connecting tape is cut, resulting in air leakage or water leakage, and that assembly and installation thereof is time-consuming and labor-intensive on-site work.

[Purpose of the invention]

The purpose of the present invention was devised in view of the problems of the conventional spiral duct, and it is intended to improve the joint strength of the joint surface and prevent leakage by eliminating misalignment of the joint part and increasing airtightness. Moreover, it is an object of the present invention to provide a spiral duct having a strong joint that can be easily assembled on-site in a short period of time.

[Structure of the invention]

In order to achieve the above object, the present invention wraps an elastic anti-corrosion heat-shrinkable tape around the joint surface of the spiral pipe, and attaches a pair of bolt fixing fittings at awkward positions on the joint surface, and connects them to both fixing fittings. The bolts are tightened to increase the joint strength and straightness at the joint, and the structure is earthquake resistant and does not cause misalignment, without causing bending moment I or shear stress on the joint surface during suspension. ing.

〔Example〕

The present invention will be specifically described below based on embodiments shown in the accompanying drawings. Note that the illustrated embodiment shows a case where it is used as a blow pipe in a driveway.

1 is a perspective view of the spiral duct I of the present invention, FIG. 2 is an explanatory view of the spiral duct in an attached state, and FIG. 3 is a sectional view taken along line 1-1 in FIG.

The spiral duct (1) is composed of a spiral tube (2) assembled by winding tin plates. (3) is a joint surface that joins the corresponding end surfaces of the spiral tube (2), and the joint surface (the third plate is wrapped with anticorrosive heat shrink tape (4) in a partially polymerized state. (5) and (6) are a pair of connecting bolt fixing fittings that are slender welded or burr bent caulked at positions symmetrically apart from the joint surface (3) of the spiral pipe (21, (2+), and both fixing Metal fittings (
5), (Both ends of the connecting bolt (7) are engaged in a tightened state at 61.

Each attached figure shows only one pair of connecting bolt fixing fittings (5L (61) in the form of a flat plate, but depending on the diameter of the duct and its environment, the flat plate may be simply made into an angle, or it may be made into multiple pairs. Of course, it is also possible to do so.

In addition, as a connecting bolt (7), both ends are connected to a NAND (8).
Instead of tightening with a bolt, use one in which one end is bent and only the other end is tightened with a bolt, as shown in the figure, which makes the work easier and allows for reliable centering.

The spiral tube (2) having such a structure is assembled as follows.

First, pass the connecting bolt (7) through the connecting bolt fixing fittings (5) and (6) of the spiral tube (2+, (2)). Using the throat (8), connect the joint surface (3) of the spiral tube (2+, (2)). After that, connect the connecting bolt (7) with a hanging tool (9) made from a straight line or a furano tono\-.
), it is suspended from the mensenger wire 00) extending inside the bell path.

Then, the joint surface (3) is partially covered with a stretchable anti-corrosion heat shrinkable tape (4) with a tensile strength of 100 kg/ctA, which is made by applying a butyl rubber adhesive to one side of the base material of a cross-linked polyethylene film. into a polymerized state and wrap it around. When wrapping the tape (4), the part is heated to 120 degrees, which is the softening temperature of the adhesive in normal cases, to strengthen the tightening.

Furthermore, as seen in FIGS. 2 and 3, frame 0
．． Since the connecting bolt (7) of the spiral duct (1) suspended from the spiral duct (1) is always at the top, the cores of the spiral pipes (2) and (21) can be attached to the connecting tape (4) without shifting. ), no shear stress is generated on the joint surface, and air leakage and water leakage from the connecting joint surfaces can be almost permanently prevented.

In addition, in the above embodiment, it was used as a blower pipe in tunnel construction, but it can also be used as a temporary drainage pipe, and in this case, it can be installed on the ground. Furthermore, when installing on the ground, the drain pipe can be fixed by connecting the above-mentioned connecting bolt to a fixed object on the ground.

〔Effect of the invention〕

As described above, the present invention has the following effects.

(1) Spiral pipe joining work can be easily performed, work time can be shortened, and construction costs can be significantly reduced.

(2) The airtightness of the joint surfaces can be significantly improved, and leakage can be completely prevented.

(3) Material costs are lower than the flange joining method.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the spiral duct according to the present invention, and Fig. 2 is the installation state of the spiral duct! 3 is a sectional view taken along line 1-I in FIG. 2. In the figure: (1) Spiral duct (2) Spiral pipe (3) Joint surface (4) Anti-corrosion heat shrink tape (5) Connection bolt fixing fitting (6) Connection hole (fixing fitting (7) Connection bolt (8) Naso 1- (9) Hanging tool 00) Mesosenja wire for hanging support Patent applicant: Kyushu Spiral Steel Tube Co., Ltd. Agent Masu Kobori (and 2 others)

Claims (1)

[Claims] 1. In a spiral duct formed by joining spiral pipes with anti-corrosion heat shrinkable tape, a pair is placed on the outer circumferential surface of each spiral pipe constituting the duct near each joint surface and at a position opposite to the joint surface. A spiral duct characterized in that a connecting bolt fixing fitting is fixedly installed, and the connecting bolt is passed between both connecting bolt fixing fittings.