JPH0681993A - Faucet with saddle - Google Patents

Abstract

(57) [Summary] [Purpose] Prevents galvanic corrosion of the faucet with saddle and facilitates construction. [Structure] Saddle 21 made of synthetic resin, having a water faucet 41 made of metal attached to the top surface, and this saddle and metal bolt 2
3, the saddle mechanism 2 consisting of a synthetic resin band 25 that is fastened by the nut 24 is combined, and the water mains P
The position is fixed by tightening from above and below. Reinforcing ribs 26 and 27 are provided on the outer peripheral surfaces of the saddle and the band at the corners with mounting holes 28A and 28B sandwiched therebetween. [Effect] Electrolytic corrosion that occurs between dissimilar metals does not occur, and the service life in the ground is extended. It is lightweight and easy to handle, reducing the burden on workers during construction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water faucet with a saddle for branching water from a water main buried in the ground to consumers such as households at the end.

[0002]

2. Description of the Related Art FIG. 2 is a schematic view showing a state of a pipe from an ordinary water main to a faucet in a home. In the figure, the water main P is already buried in the ground, and when a new demand for water is generated here, the pipe is dug up to expose the pipe and pierce the outer peripheral top surface, and the portion with the saddle that communicates there is added. Faucet 1
Attach. A water supply pipe extends from the saddle-equipped water faucet 1 through the ground to reach a water faucet K in a home through a water meter M (meter).

3 (A) and 3 (B) show a standard of a water faucet 1a with a saddle which has been widely used in the past (defined by the Japan Water Works Association).
Is an example. The saddle type water faucet 1a is formed by combining a water stop mechanism 4a and a saddle mechanism 2a. The water stop mechanism 4a is mainly composed of a bronze water faucet 41a, and the saddle mechanism is a ductile cast iron saddle 21a to which the water faucet 41a is screwed and fixed, the saddle 21a and a stainless steel bolt. 23a and a band 25a made of ductile cast iron which is fastened by the nut 24a.

Most of the water faucet with a saddle, as illustrated here, is attached to the mains of the water supply and is backfilled again and buried in the ground. Since the work must be dug up and repaired, and the work is uncomfortable, particularly strict preventive measures are indispensable for the progress of corrosion in the ground after installation.
That is, in terms of material, the water faucet uses bronze with high corrosion resistance, and the saddle and band are coated with the same anticorrosion paint as the main pipe on the surface of the ductile cast iron product to add corrosion resistance not inferior to the main pipe. . Further, as for the bolts and nuts for fastening the saddle and the band, the corrosion resistance is not sufficient if they are made of ordinary steel, so that the bolts and nuts made of stainless steel have to be applied.

On the other hand, the saddle mechanism is located in the ground and sandwiches the outer peripheral surface of the main pipe into a semi-cylindrical shape from above and below and firmly tightens it so that the water faucet with a saddle does not shift from the fixed position where the main pipe is drilled. It is a requirement to be laid up. For example, if the fastening is loosened due to an earthquake or the vibration of a vehicle passing on the ground, and the position of the saddle with a saddle shifts, it is the same as the cause of water leakage, and above all it must be prevented. At present, as the mains for water supply, mainly ductile cast iron, and some materials such as asbestos cement pipe, hard vinyl chloride pipe, steel pipe, etc. are also used, but the standard is that the saddle tightening torque for each pipe material ( kg
(f-cm) is set and it is obligatory to tighten according to this regulation for on-site construction. For example, when the nominal diameter of the bolt is M16 (mm), the tightening torque is
If the main pipe is a steel pipe or cast iron, the pressure is 600 kgf-cm, and if the main pipe is a hard vinyl chloride pipe, it is 400 kgf-cm. Naturally, the saddle mechanism also has sufficient strength to withstand the tightening. Is the condition for adoption. Due to the structure, the torque concentrates most during this tightening at the corners as viewed in the direction of the arrow in FIG. 3, and the wall thickness of this part is set by calculating from the strength of the ductile cast iron in order to comply with the above torque. There is.

[0006]

As is well known, each metal material has its own electrode potential, and also has a unique potential (natural potential) depending on the combination of the metal material and the environment. Gold, stainless steel, bronze, nickel,
The potentials of steel and cast iron become smaller, and the natural potential series in which zinc and base metals such as magnesium are lined up is well known. Now, when different metals are in contact with each other and exist in the ground, etc., the potential difference between the metals causes corrosive corrosion of dissimilar metals, and the metal with the lower potential acts as an anode to promote relatively fast corrosion. It is often seen. Corrosion of ductile cast iron, which is the most base metal of saddle water faucet, is most anxious, so heavy coating such as epoxy powder coating is applied on the surface to prevent contact with stainless steel bolts and nuts. Therefore, anticorrosion measures such as sandwiching a resin insulator between them are taken. For this reason, there is a concern that the load on the process will increase and the number of parts will increase, and that the surface coating may peel off due to impact during handling during transportation and installation work, and localized localized corrosion may occur. It is hard to say that it was expected.

[0007] In some cases, the work of branching and distributing water from the main pipe can be performed simultaneously from the beginning of pipe laying, as in a newly constructed residential area, but there are many cases where a new branch is made from an already laid pipe. In any case, the work is difficult especially in the latter case. That is, since the water tap with saddle is attached to the main pipe dug up in a narrow excavation groove, the work is not easy, and the saddle and band divided into upper and lower semi-cylindrical parts are used with a socket wrench with a ratchet. It is heavy labor that involves an unstable posture. This is partly due to the fact that it is difficult to work in the trench, but the biggest factor is that the mechanization of this work is difficult and it cannot be relied on other than manual work. It is considered that this is because the weight is relatively large, so labor is required to carry it, and construction opportunities frequently occur, which places a heavy physical burden on workers.

In order to solve the above-mentioned problems, the present invention is resistant to corrosion even if it is buried in the ground, has a long service life, is lightweight in construction and is easy to perform by hand. For the purpose of providing.

[0009]

A water faucet with a saddle 1 according to the present invention comprises a water stop mechanism 4 made of metal and a semi-cylindrical saddle 21 made of synthetic resin with the water stop mechanism attached to the top. And a saddle mechanism 2 of a semi-cylindrical band 25 made of synthetic resin, which is fastened by metal bolts 23 and nuts 24 to the saddle and flanges 22A and 22B on both side surfaces.
And the above-mentioned problem was solved by providing a reinforcing rib around the outer peripheral side surface of the band 25. Further, in this case, it is desirable that the portion around which the reinforcing ribs are provided has a wall thickness that has a tensile strength that is at least twice or more the tightening torque specified when the saddle is tightened, and the cross-sectional shape of the reinforcing ribs is 21. And 1 for the thickness of the band 25
It is best to have a height of / 2 to 3 times.

[0010]

In the water faucet with a saddle according to the present invention, since the saddle for holding the water faucet and the band to be fastened to the saddle are made of synthetic resin, a bolt / nut made of stainless steel or a water divider made of bronze. There is no potential difference between the two members even when they come into contact with the stopper, and no electrolytic corrosion action occurs on the saddle, which is more neutral in potential than both materials. Therefore, once the water faucet is attached to the main pipe at a predetermined position and fixed to the outer periphery of the pipe, the water faucet is restrained even if vibration is propagated due to subsequent changes in the crust and the passage of vehicles on the ground. Since the tightening force of the saddle on the main pipe is not changed and is maintained forever, the water diverter will not be displaced from the initial position. Also, needless to say, the material is made of synthetic resin with much smaller specific gravity, so the total weight of the product is considerably reduced even if it has almost the same shape, and the burden on the worker during construction is much lighter than before. .

On the other hand, in the installation work on the main pipe,
Calculate the material strength difference between conventional ductile cast iron and synthetic resin so that the tightening torque can be countered, and saddle,
Reinforcing ribs are provided around the outer peripheral surface of the band to ensure the preservation of the corners where the tightening torque is concentrated. As a result, strength reliability is also sufficiently ensured, and there is no fear of damage during tightening work in the field construction or loosening during use.

[0012]

1 (A), 1 (B) and 1 (C) are a plan view and a front view (longitudinal front view) showing a saddle mechanism 2 in an embodiment of the present invention. FIG. A is a plan view of the saddle 21, FIG. B is a front view (right half) and a vertical front view (left half) of the saddle 21 and the band 25, and FIG. C is a plan view of the band 25. The saddle and band consist of stainless steel bolts 23 and nuts 24.
The flanges 22A and 22A provided on the respective side surfaces.
It is inserted into the mounting holes 28A, 28B of B and tightened, and the mains P of the water supply is pressed from above and below to fix its position. Although only the end is shown here, there is a holding hole 29 on the top surface of the saddle into which the end of the water dip 41 is screwed, and the end of the screwed water dip is pierced. Communicate with the water intake hole of the pipe.

As shown in the drawings, reinforcing ribs 26 and 27 are provided on the outer peripheral surfaces of the saddle and band. The reinforcing ribs are both bolt and nut mounting holes 28A and 28B.
Since the nut is screwed with a socket wrench for the saddle, a slight relief (retracting portion 30 on the inner side surface) is provided as a recess. As described above, the purpose of the reinforcing rib is to strengthen the corner portion between the semi-cylinder and the flange where torque is concentrated during tightening work. Therefore, as is clear from Fig. B, the top surface of the reinforcing rib extends gently to the corner. It draws a curve and connects them. Since the thickness of the reinforcing ribs meets this purpose, the strength (tensile strength) of the synthetic resin material that composes the saddle or band is used as a standard, and the water pipe of the partner to which the water faucet with saddle is attached is attached. It is desirable to set and calculate twice or more the tightening torque specified by the material of.

A resin saddle having a wall thickness of 5 to 15 mm is suitable, and in consideration of the fact that the conventional cast iron one has a thickness of 7 mm or more and the bronze one having a thickness of 5 mm or more, the resin saddle is made of resin. Was also equal or higher. If the wall thickness exceeds 15 mm, there is a manufacturing problem such as a sink mark during molding, which is economically disadvantageous, which is not suitable. Ribs are provided around the wall so that damage or deformation due to excessive tightening torque at the time of tightening does not occur with respect to the wall thickness. As for the shape of the rib, as a result of examining the relationship between the cross-sectional shape and the generated stress, it was found that the height of the rib is appropriately in the range of 1/2 to 3 times the wall thickness. That is, for a wall thickness of 15 mm, the height of the rib should be about half that of 8 mm, and the ratio of the rib height increases as the wall thickness decreases, but if this exceeds 3 times, This is a limitation because the bolt tightening work becomes difficult. The reason why the shape of the rib is limited by the height with respect to the wall thickness is that the effect on the strength is larger than that defined by the width of the rib.

The synthetic resin used as the material for the saddle and band is not particularly limited, but polyamide, polyphenylene sulfide, polyacetal, polyethylene terephthalate, polyether sulfone, polyimide, polybutylene terephthalate, modified polyphenylene ether, polycarbonate, poly Engineering plastics such as arylate, polyetheretherketone, liquid crystal polymer, or polymer alloys thereof, or general-purpose resins such as polyvinyl chloride or polypropylene, or alloys thereof, or alloys of the above-mentioned engineering plastics with general-purpose resins, etc. is there. If necessary, glass resins, carbon fibers, alumina fibers, mineral fibers, potassium titanate whiskers, titanium oxide whiskers, wollastonite, calcium carbonate, talc and other reinforcing agents may be added to these resins.

As Example 1, a 75 mm impact-resistant hard vinyl chloride (HIVP) water main was equipped with a nylon resin saddle and a water faucet with a saddle using a band. The height of the reinforcing ribs was 16 mm, and the width was 15 mm, and the reinforcing holes were provided around the upper and lower sides of the mounting hole. Tightening torque is 400kg-cm as specified, and 0.2kgf after installation
/ Cm ² × 2 minutes and 17.5 kgf / cm ² × 2 minutes of water pressure test were conducted, but no abnormality such as water leakage was observed.

In Example 2, a 50 mm rigid vinyl chloride (VP) water main was equipped with a saddle made of polyphenylene sulfide resin and a water faucet with a saddle using a band. The shape of the reinforcing ribs and the procedure of the water pressure test after attachment were the same as in Example 1, but no abnormality was found as a result of the test. In addition, the water faucet with a saddle used in both of these examples was immersed in the sea for one year and inspected for corrosion. However, frequent metal contact corrosion between dissimilar metals did not occur, and a sound condition was maintained. It was

As Example 3, a 50 mm steel pipe (SGP) water main was equipped with a nylon resin saddle and a water faucet with a band saddle. Height of reinforcing rib is 20mm,
Two strips having a width of 15 mm were provided around the top and bottom. The tube was tightened with a tightening torque of 600 kgf-cm, and the tube was mounted under a specified load. Then, a water pressure test similar to that of the above-mentioned example was carried out.

[0019]

As described above, the present invention eliminates the concern of electrical corrosion due to contact of dissimilar metals, and guarantees a sufficiently long service life even when buried in the ground. Other metal-specific stress corrosion cracking and fatigue phenomena are avoided, and problems such as water leakage are unlikely to occur. Since the saddle and band are made of synthetic resin, they generally have some flexibility, and are more adaptable than metals to changes in the crust and temporary vibrations such as earthquakes and passage of vehicles on the ground. Can also be said. In terms of strength, a sufficiently reliable form can be selected by appropriately surrounding the reinforcing ribs calculated from the strength of the material of the synthetic resin used. Furthermore, the weight of the whole faucet with a saddle has been reduced from 1/2 to 1/3 compared with the conventional one, and the on-site construction is remarkably facilitated, and the physical burden on the worker is greatly reduced.

[Brief description of drawings]

1A, 1B, 1C show a front view and a plan view of an embodiment of the present invention.

FIG. 2 shows a current water supply system.

3A and 3B show a vertical sectional front view and a side view of a conventional technique.

[Explanation of symbols]

 1 Faucet with saddle 2 Saddle mechanism 4 Water stop mechanism 21 Saddle 22 Flange 23 Bolt 24 Nut 25 Band 26 Reinforcing rib (saddle) 27 Reinforcing rib (band) 28 Mounting hole 29 Holding hole 30 Entry / exit 41 Faucet

Front page continued (72) Inventor Ichiro Shiomi 1-12-19 Kitahori, Nishi-ku, Osaka City, Osaka Prefecture Kurimoto Iron Works Co., Ltd. Gas Chemicals Co., Ltd. Plastics Center (72) Inventor Kazuo Yamamiya 5-6-2 Higashihachiman, Hiratsuka City, Kanagawa Sanryo Gas Chemicals Co., Ltd. Plastics Center

Claims (3)

[Claims] 1. A water stop mechanism 4 made of metal, in a water faucet 1 with a saddle for branching and distributing water from a water main that is buried underground.
A semi-cylindrical saddle 21 made of synthetic resin with the water stop mechanism attached to the top, and the flanges 22A, 22 on both sides of the saddle.
It is composed of a saddle mechanism 2 of a semi-cylindrical band 25 made of synthetic resin which is fastened with a metal bolt 23 and a nut 24 at B, and reinforcing ribs are provided around the outer peripheral side surfaces of the saddle 21 and the band 25. Water tap with saddle. 2. The portion according to claim 1, wherein the portion around which the reinforcing ribs are provided has a wall thickness that is at least twice as strong as the stress generated by the tightening torque specified when the saddle is tightened. Water tap with saddle. 3. The reinforcing rib according to claim 1 or 2, wherein the reinforcing rib has a cross-sectional shape of 1 with respect to the thickness of the saddle 21 and the band 25.
A water faucet with a saddle having a height of ⅔ to 3 times.