JPH0720498U - Metal tube end face protection - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a metal pipe end face anti-corrosion material that contributes to rapid pipe laying work by enabling extremely fast pipe end corrosion protection when cutting and connecting metal pipes. To aim. [Structure] A reverse taper-shaped short that is gradually expanded from the inner diameter r of the metal tube 2 toward the end on the inner peripheral edge 1B of the ring-shaped body 1A having substantially the same inner and outer diameters r and R as the end surface 2A of the metal tube 2. A cover member 1D in which a tubular body 1C is integrally formed and wholly made of a rubber material, and a closed-cell foam body that has substantially the same inner and outer diameters r and R as the end surface 2A of the metal tube 2 and is elastic The end surface 2A of the metal tube 2 and the cover member 1
Buffer member 1E inserted between the ring-shaped member 1A of D
And an expanded elastic ring body 1F having a C shape along the inner diameter of the short tubular body 1C, or an elastic ring along the inner diameter of the short cylindrical body 1C in place of the expanded elastic ring body 1F having the C shape. The body is composed of an elastic ring body 1G having a bent portion in a part of its circumference, and the diameter of which can be expanded by expanding the bent portion. It can be installed securely and reliably, and achieves complete corrosion protection over a long period of time.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a metal tube end face preventive food material.

[0002]

[Prior art]

 Conventionally, metal pipes such as ductile pipes and cast iron pipes have been widely used as underground pipes. When laying these metal pipes, as shown in FIG. 5, the insertion port B1 of the connection pipe B is inserted into the receiving port A1 formed at the pipe end of the metal pipe A, and the periphery is sealed with the rubber ring C for connection. Things are done. In addition, D in the drawing indicates a push ring of the rubber ring C. By the way, in the connection work of these pipes, when adjusting the length of the pipe line, cut the insertion port B 1 to adjust the length L of the pipe, and insert it into the receiving port A 1 to lay it. However, since the metal material forming the pipe is exposed on the cut end surface of the insertion opening B1, it is necessary to separately perform anticorrosion work on this portion, and in the past, this cut end surface was subjected to anticorrosion coating.

However, in the case of the above-mentioned anticorrosion means, it is necessary to sufficiently dry and cure this anticorrosion paint before pipe connection, and there is a problem that the construction period cannot be shortened because the construction must be interrupted during the curing period. there were. In order to solve such problems, it is possible to cure the anticorrosion coating early by heating, etc., but this type of metal pipe usually has an anticorrosion coating on its inner surface, which may be corroded by heat. Such coating means cannot be adopted.

In order to solve such a problem, the applicant of the present application, as shown in FIG. 6, has an inner peripheral edge 1B of a ring-shaped body 1A having inner and outer diameters r and R substantially the same as the end surface 2A of the metal tube 2. In addition, a cover member 1D which is integrally formed of a reverse-tapered short tubular body 1C whose diameter gradually increases from the inner diameter r of the metal tube 2 toward the end, and a cover member 1D which is entirely made of a rubber material, and an end surface 2A of the metal tube 2. A buffer member 1E which is formed of a closed-cell foam body having inner and outer diameters r and R substantially the same as that of the whole and having elasticity, and is interposed between the end surface 2A of the metal tube 2 and the ring-shaped body 1A of the cover member 1D. We proposed an end-face anti-corrosion rubber for metal tubes consisting of and (Japanese Patent Application No. 5-3418). This end face anticorrosion rubber of the metal pipe makes it possible to protect the end face of the metal pipe by simply applying it to the pipe end face and to simplify the work.

[0005]

[Problems of conventional technology]

 However, the anticorrosion rubber on the end face of the metal pipe is mounted in a perfect state because the reverse taper-shaped short tubular body 1C inserted into the inner face of the pipe end is pressed against the inner face of the pipe only by the elasticity of the rubber. When not installed or when the pipe cleaning tool is inserted, the reverse taper-shaped short tubular body 1C unnaturally bends or comes off.

[0006]

[Problems to be solved by the device]

 In view of the above problems, this invention can prevent the pipe end from corroding very quickly, and reliably prevent the accidental disconnection of the short tubular body 1C in the metal pipe end face preventive food material that contributes to the quick pipe laying work. In addition, the purpose of the present invention is to provide a metal pipe end face preventive food material that is easy to install.

[0007]

[Means for Solving the Problems]

 That is, the metal pipe end face food preventive material of the present invention is located on the inner peripheral edge 1B of the ring-shaped body 1A having substantially the same inner and outer diameters r and R as the end face 2A of the metal pipe 2 and from the inner diameter r of the metal pipe 2 toward the end. A cover member 1D made entirely of rubber and integrally formed with an inversely tapered short cylindrical body 1C having a gradually expanded diameter, and an inner and outer diameters r and R substantially the same as the end surface 2A of the metal tube 2 are formed. Is formed of a closed-cell foam having elasticity, and is interposed between the end surface 2A of the metal tube 2 and the ring-shaped body 1A of the cover member 1D, and the inner diameter of the short tubular body 1C. The present invention is characterized by comprising a C-shaped expanding elastic ring body 1F, and another invention is to replace the C-shaped expanding elastic ring body 1F with the short cylindrical body 1C. It is an elastic ring body along the inner diameter and has a bent part in a part of the circumference, And it is characterized in that consists of expandable elastic ring member 1G by expanding the bent portion.

[0008]

【Example】

 Next, an embodiment of this invention will be described. FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a front view of a C-shaped expanded elastic ring body 1F, FIG. 3 is a sectional view showing a usage state of the embodiment, and FIG. It is a front view which shows the folding state of the radial elastic ring body 1G.

The metal tube end face food preventive material 1 according to the present invention has a ring-shaped body 1A having substantially the same inner and outer diameters r and R (see the same) as the end face 2A (see also FIG. 6) of the metal pipe 2 (see FIG. 6). The inner peripheral edge 1B of the metal tube 2 is integrally formed with a reverse taper-shaped short cylindrical body 1C whose diameter is gradually increased from the inner diameter r of the metal tube 2 toward the end. A cushioning member which is formed of a closed-cell foam body having inner and outer diameters r and R substantially the same as those of the end surface 2A and having elasticity as a whole and which is interposed between the metal tube end surface 2A and the ring-shaped body 1A of the cover member 1D. 1E and a radially expanded elastic ring body 1F having a C shape along the inner diameter of the short tubular body 1C. In the above embodiment, the cushioning member 1E is made of a soft rubber or synthetic resin foam having independent cells.

Further, as shown in FIG. 4, an elastic ring body 1G extending along the inner diameter of the short tubular body 1C is used in place of the C-shaped expanded elastic ring body 1F. An elastic ring body 1G having 1G 'and capable of expanding the diameter by expanding the bent portion 1G' may be used. This elastic ring body 1G is made of a thin strip-shaped metal plate made of stainless steel, and has a bent portion 1G 'formed in a part of the circumference as shown in FIG. At this time, the bent portion 1G 'is expanded and used for expansion.

[0011]

[Action]

 The metal pipe end face anti-corrosion material 1 of the present invention, after combining the buffer member 1E and the cover member 1D, is fitted into the end face 2A of the metal pipe 2 whose metal surface is exposed as shown in FIG. The diameter-expanded elastic ring body 1F is compressed and reduced in diameter and inserted into the short cylindrical body 1C, and the diameter is restored and expanded to be crimped inside the tube.

Further, in the case of the elastic ring body shown in FIG. 4, the reduced diameter is inserted into the short cylindrical body 1C, and the polygonal line portion is extended to restore a circular shape to the surplus portion of the polygonal line portion 1G '. Bend 1 H to fix the diameter and crimp it inside the tube. At this time, since the elastic ring body 1G expands along the inner surface of the tube with a slight force, it can be fixed quickly and easily. Also, by adjusting the length of the surplus portion 1H, it can be applied to different tube inner diameters. It will be possible.

[0013]

[Effect of device]

 As described above, according to the metal pipe end face anti-corrosion material 1 of the present invention, when the cut pipe end face is applied and inserted into the receiving port, the exposed metal face is completely sealed to prevent the pipe end face from being corroded. In addition, since the short tubular body 1C is crimped and fixed along the inner surface of the pipe, it does not come off even when the cleaning tool inside the pipe is inserted, and exhibits various practical effects such as exhibiting a waterproof function for a long period of time. To do.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a front view of a diameter-expanding elastic ring body 1F having a C shape.

FIG. 3 is a cross-sectional view showing a usage state of the embodiment.

FIG. 4 is a front view showing a folded state of another radially expanded elastic ring body 1G.

FIG. 5 is an explanatory diagram of a conventional example.

FIG. 6 is a sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... End surface anti-food material of metal tube 1A ... Ring-shaped body 1B ... Inner peripheral edge 1C ... Short cylindrical body 1D ... Cover member 1E ... Buffer member 1F ... C-shaped expanded elastic ring body 1G ... Expandable elasticity Ring body r ... Inner diameter R ... Outer diameter 2 ... Metal tube 2A ... Metal tube end surface

Claims (2)

[Scope of utility model registration request] 1. An inner and outer diameter r substantially the same as the end surface 2A of the metal tube 2,
The inner peripheral edge 1B of the ring-shaped body 1A having R is integrally formed with an inversely tapered short tubular body 1C whose diameter is gradually increased from the inner diameter r of the metal tube 2 toward the end. The cover member 1D and the end surface 2A of the metal tube 2 are formed of a closed-cell foam having substantially the same inner and outer diameters r and R as the whole, and have a ring shape of the end surface 2A of the metal tube 2 and the cover member 1D. Cushioning member 1 inserted between body 1A
An end face food preventive material for a metal pipe, comprising E and a diameter-expanding elastic ring body 1E having a C shape along the inner diameter of the short tubular body 1C. 2. An inner and outer diameter r substantially the same as the end surface 2A of the metal tube 2,
The inner peripheral edge 1B of the ring-shaped body 1A having R is integrally formed with an inversely tapered short tubular body 1C whose diameter is gradually increased from the inner diameter r of the metal tube 2 toward the end. The cover member 1D and the end surface 2A of the metal tube 2 are formed of a closed-cell foam having substantially the same inner and outer diameters r and R as the whole, and have a ring shape of the end surface 2A of the metal tube 2 and the cover member 1D. Cushioning member 1 inserted between body 1A
E and an elastic ring body 1G which is an elastic ring body along the inner diameter of the short tubular body 1C and which has a bent portion in a part of its circumference and which can be expanded in diameter by expanding the bent portion. A metal tube end face preventive food material.