JPS5922389Y2 - Flexible joint for hume pipe - Google Patents

Description

[Detailed explanation of the invention] This invention integrates a flexible part in the middle of the Huyum canal, which has strong bonding properties and is highly safe and durable. Concerning joints, it absorbs various displacements and vibrations such as bending and eccentricity caused by ground movement of buried pipes or earthquakes, etc., and prevents damage and leakage of humu pipes. This is an improvement to the Huyum pipe joint, which provides excellent functionality.

Conventionally, piping, especially buried piping, has been damaged due to the inability of the piping to comply with soil regulations.

Particularly in the case of Hume tubes, in addition to breakage, defects occur at the ends.

Therefore, as a safety measure, if subsidence is expected,
The ground is reinforced by piling or expensive flexible pipes are installed.

In the conventional flexible joint structure for a hume tube, as shown in the cross section of the flexible part of the hume tube 2 in FIG.
and a part of the length of the metal circular tube 3a for outer periphery coating, which has the same diameter as the outer diameter of the hume tube 2, are integrally vulcanized and joined, and both ends of the flexible portion are integrally molded during manufacture of the hume tube. It was manufactured using

However, the hume tube flexible joint has the following drawbacks.

Since the tube 2 and the cylindrical rubber 1 are directly joined, only a weak adhesive force can be obtained.

Therefore, it easily separates due to bending, fluctuating stress, etc., and it is undesirable that the joint is formed on the outer surface of the cylindrical rubber 1, where new bending stress is concentrated, as it causes damage and growth. .

(b) Since the flexible part of the cylindrical rubber 1 is narrowed by metal, the flexibility function is insufficient, and the effect of stress concentration on the joint with the humid pipe is large, so the separation of the joint is promoted. By the time the adhesive is separated, the weak adhesive force is further weakened and water leaks easily.

C. Because coated metal cylinders are exposed, they are prone to corrosion. In particular, all metal corrosion is accelerated from the edges, and metal-to-rubber joints and metal-to-huum tube joints are exposed to corrosion. The adhesive effect is rapidly lost due to corrosion, and defects are further increased by fluctuations such as vibration and bending.

As mentioned above, it includes many drawbacks.

Therefore, in order to eliminate the drawbacks of the conventional flexible part, this invention has a structure in which the flexible part exhibits sufficient flexibility, maintains a strong joint, and has a structure in which the end of the hume tube is In order to prevent damage, the parts are constructed so that they are not affected by stress concentration.

Next, aspects of this invention will be explained based on exemplary drawings.

FIG. 2 is a partial sectional view of the main part of the flexible joint when the diameter of the humid pipe is large, and shows a metal cylinder 3 with a flange and a cylindrical rubber 1 connected to a covering rubber 1a, which are integrally vulcanized and bonded. A flexible joint for a hume tube is constructed by forming the outer metal portion of the flexible portion molded by molding and joining the ends of both hume tubes 2 to be joined, particularly by integrally joining them together.

In this case, a plurality of anchor bolts 4 are fixed in advance to the metal flange portion for adhesion between the metal flanged cylinder 3 and the hume tube 2 and for reinforcement of the end of the hume tube.

In the case of FIG. 2, the metal flanged cylinder 3 has a flanged part 3b and a cylindrical part 3a integrally formed, and the anchor bolt 4 is screwed and fixed with a threaded part 5 parallel to the axial direction of the humid tube. Alternatively, as shown in FIGS. 3 and 4, the metal flange cylinder 3 may be formed by welding the flange portion 3b and the cylindrical portion 3a together at a welding portion 6.

In addition, if the hume pipe diameter is small, use anchor bolt 4.
may be welded and fixed to the metal flange cylinder 3 as shown in the welding part 6 in FIG.

At least two or more anchor bolts 4 are required, and it is effective even if the length is shorter than the length of the cylindrical portion of the metal flanged cylinder 3.

As described above, the configuration of this flexible joint for a humid pipe is as shown in the figure, in which the cylindrical portions 3a of the two opposed metal flanged cylinders 3 are directed outward, and the flanged portions 3b are spaced apart from each other by a required distance. the left and right cylindrical parts 3 from between the flange parts 3b.
A flexible portion is formed by integrally molding the cylindrical rubber 1 and the covering rubber 1a over the upper surface of the cylindrical rubber 1 and the covering rubber 1a to fix the inner sides of the two metal flanged cylinders 3 at the same time as the rubber is vulcanized. .

Further, the left and right outer surfaces of both metal flanged cylinders 3 are fixed together with anchor bolts 4 fixed on the outside by integrally molding the hume tube 2 by centrifugal casting.

The outer circumferential surface of the covering rubber 1a and the outer circumferential surface of the fume pipe 2 are formed at the same height, and the inner end of the flange 3b is arranged within the wall of the fume pipe 2 so as not to be exposed. The flexible portion and the hume tube are integrally connected to form a flexible joint for the hume tube.

As described above, the flexible length a of the cylindrical rubber 1 is the same width as shown in FIGS. However, the present invention is not limited to this, and the flexible structure in which the width of the cylindrical rubber 1 decreases from the outer diameter part to the inner diameter part of the hume tube 2 as shown in FIG. Joints also belong to the present invention, and when greater flexibility is required, it is preferable to use a flexible joint as shown in FIG.

In addition, the flexible joint of this invention has a flexible length a, a cylindrical length b, a flange width, and an experimental result assuming that the bending characteristics are 2 to 4 times that of the current hume pipe. C and the maximum diameter of the Hume tube, the ranges are approximately as shown in the table below.

In addition, in the relationship between the flexible length a and the maximum diameter of the Huum tube, a=D
x (0.06 to 0.13) That is, the flexible length a is preferably 6 to 13% of the maximum diameter of the hume tube.

Regarding b and C, it is desirable that b>c and 2C<b<4C.

That is, the cylinder length b is larger than the flange width C,
The most preferable value is 2 times or more, and the upper limit is limited to about 4 times from the viewpoint of effectiveness and economy.

The hardness of rubber is 50°±1 for small diameter 200 to 500φ.
0°, large diameter 600~1000φ 45°±
10° is desirable.

In addition, in order to improve the pressure resistance of the flexible joint, the cylindrical rubber 7
It is preferable that the fiber cord 8 is continuously wound around the cylindrical rubber 7 in the circumferential direction (perpendicular to the axial direction of the hume tube).

As explained above, the flexible joint for the humid pipe of this invention is made by integrating the metal flanged cylinder 3 consisting of the cylindrical part 3a and the flange part 3b, the cylindrical rubber 1 and the covering rubber 1a by vulcanization and adhesive. A flexible portion is formed, and this flexible portion is a flexible joint of a hume tube that is integrally connected to a hume tube 2 by providing a plurality of anchor bolts 4 on the outside of the collar portion.

Therefore, it has the following effects.

■ The flexible part is made of vulcanized adhesive between metal and rubber, so
A strong primary bond (chemical bond) can be obtained that can destroy rubber.

■ Good adhesion can be obtained between the flexible part and the hume tube because they are integrally bonded during centrifugal molding of the hume tube, and stable adhesion can be obtained due to mutual rigid bonding between the metal and the hume tube. Furthermore, since it is strongly fixed by the anchor bolt and held by the long cylindrical part 3a, the end of the hume tube can be firmly fixed without changing due to stress such as bending. , suitable flexibility of the cylindrical rubber 1 can be obtained without concentration of stress at the end of the hume tube.

Therefore, the end of the hume tube is sufficiently reinforced and there is no risk of breakage.

■ The metal flange cylinder 3, which is chemically bonded to rubber, consists of a cylindrical part 3a and a flange part 3b, and the cylindrical part 3a in the longitudinal direction of the humid tube is considerably longer than the flange part 3b and is formed outward. The cylindrical rubber 1 and the covering rubber 1a are integrally covered without hindering the flexibility of the cylindrical rubber 1,
Since the surface is formed with no stress concentration points such as joints, there is no concentration of fluctuating stress on the flexible parts when distortions such as bending or eccentricity occur due to ground movement or earthquakes. Stress is well distributed and good flexibility and long-term durability are maintained.

■ All metal parts of the metal flange cylinder 3 are covered with rubber and there is no exposed metal part, and the rubber and metal are integrally formed by vulcanization adhesive molding of unvulcanized rubber as described above. The joints between metal, metal and rubber, and the joints between metal and hume pipe, where strong adhesion can be obtained and the durability life is shortest, are all placed inside the wall of the hume pipe so that they are not exposed on the inner and outer peripheral surfaces. Because it is structured in this way, there is no risk of corrosion, it maintains its bonding properties over a long period of time, and exhibits flexibility.

■ Since the end of the hume tube is reinforced by the cylindrical portion 3a of the metal flanged cylinder 3 and the anchor bolt, a good molding condition can be obtained without any problem in integrally joining the hume tube by centrifugal molding. .

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of the main part of a conventional hume pipe flexible joint, Fig. 2 is a partial sectional view of the main part showing an example of the hume pipe flexible joint of this invention, and Fig. 3 is a metal FIG. 4 is a partial view showing the welded components of the flanged cylinder and the anchor bolt. FIG. An anchor bolt is screwed into the threaded portion 5. FIG. 5 is a partial sectional view of a main part of a flexible joint for a hume tube showing another embodiment of this invention. 1... Cylindrical rubber, 2... Hum tube,
3... Metal cylinder with flange, 3a... Cylindrical part, 3b... Flange part, 4... Anchor bolt, 5... Threaded part, 6...Welded part,
7... Cylindrical rubber, 8... Fiber cord.

Claims (2)

[Scope of utility model registration request] (1) Each cylindrical part 3a of two metal flanged cylinders 3
between the two flange parts 3b, the inner end thereof, and the cylindrical part 3a, which are arranged facing each other with a required spacing between them, facing outward.
The upper surface is covered with a cylindrical rubber 1 and a covering rubber 1a, and a flexible part is formed by integrating two metal flanged cylinders 3 with vulcanization adhesive, and a plurality of anchors are provided on the outside of the flanged part 3b. A flexible joint for a hume pipe integrally connected to a hume pipe 2 by providing a bolt 4. (2) The flexible joint for a Huyume tube according to claim 1, wherein the cylindrical length b of the cylindrical portion 3a and the flange width C of the flange portion 3b are such that b>c and 2c<b<4c. .