JPH07208675A - Structure of perforated part for cast iron pipe branching - Google Patents

Abstract

PURPOSE:To eliminate an influential element for forming rust by fitting spacers which are in contact with the outer circumferential surface of the upper flange of an anticorrosive sleeve into the lower end inner circumferential surface of the axis hole of a snap tap. CONSTITUTION:Upper flanges 21 of an anticorrosive sleeve are locked in circular holes 13 perforated to a cast iron pipe 1, and lower flanges 23 are sticked on the cement linings of the inner surface of the cast iron pipe 1 or anticorrosive layers 14 coated with epoxy resin powder, etc. Spacers 31 wherein an inner circumferential surface which is in contact with the outer circumferential surface of the upper flange 21 are fitted into the lower end inner circumferential surface 33 of the axis hole 32 of a snap tap 3. Hereby, any trouble which occurrs in the vicinity of a water line piping end, such as mixture of chips of a drill during a perforating period, induction of oxidation action following after the mixture and occurrence of red water following after the oxidation action is previously prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a perforated portion for branching a cast iron pipe when a pipe for branching from a pipe for water supply is constructed for home use.

[0002]

2. Description of the Related Art It is often necessary to make a new branch from a pipeline for water supply buried in the ground to distribute water to new consumers. If branch work is not carried out, it will be troublesome, and the impact on other users will be considerable. For this reason, in recent years, generally, in plumbing work, without diluting the main pipe, a dip with a saddle is attached to the surface of the branch point of the cast iron pipe that is exposed by digging from the ground, and a drill is drilled from above through a shaft hole that cuts vertically through the center of the dip. To cut through the circular hole for branching in the cast iron pipe, pull up the drill and close the water dip to cut off the outflow of water, close the shaft hole in the center of the plug at the upper end, and A well-known and commonly used technique is to connect a branch pipe to the pipe and then open a water diversion valve to distribute water from the pipe to the branch pipe.

However, in this case, since the cast iron pipe is perforated after the water dip is attached, the circular hole newly penetrated by the drill exposes the ductile cast iron which is the material of the cast iron pipe as it is to continuously pass water. Since they come into contact with each other, rusting is unavoidable on the surface of the circular hole, and red rust mixes with tap water and gets into a faucet such as at home, and the water quality carefully adjusted changes to so-called red water polluted water. It is likely to result in the purchase of consumers' orders.

As a conventional technique for improving this point, a means mainly covers and protects the inner peripheral surface of the perforated circular hole by covering it with an anticorrosion sleeve made of a corrosion resistant material.
Even in this case, a structure in which flanges are provided on the upper and lower sides of the anticorrosion sleeve so that water does not directly flow to the inner surface of the perforation and the inner and outer surfaces of the cast iron pipe are in close contact with each other, and a device for forming the structure is drawing attention. . As described above, since the water dip with saddle is attached to the branch point of the cast iron pipe in advance and then the perforation is performed, a special procedure is required to fit the anticorrosion sleeve with the flange to the inner surface of the perforated circular hole. And it is logical that a device is needed. For this reason, for example, in Japanese Patent Publication No. 54-17164, an inward expansion is provided with an upper flange 21a through a shaft hole 32a of a water faucet 3a mounted on the outer peripheral surface of a cast iron pipe 1a as shown in FIG. 4 (A). A cylindrical anticorrosion sleeve 2a having a projecting portion 102 at the lower end is fitted into the circular hole 11a from above, and further the push rod 10 is inserted from above.
Push down 1 and use the taper surface of the rod tip to prevent corrosion
Press the inner surface of a. As the push rod is pushed down in the vertical direction, the bulging portion 102 of the anticorrosion sleeve 2a is pressed and plastically deformed, and eventually deformed into an outwardly bulging shape as shown in FIG. 2B, and cement lining on the inner surface of the cast iron pipe. When it is pressure-bonded with the anticorrosion layer 14a such as or epoxy resin powder coating, it sings.

However, a modification of this structure is still insufficient for preventing the intrusion of water into the inside of the anticorrosion sleeve (the surface of the circular hole), and a further improved conventional technique is shown in FIG. There is a gazette. As shown in FIG. 3A, the push rod 104 having a pressing projection 105 rotatably supported on the sheath tube 103 at its lower end is lowered to lower the lower end of the anticorrosion sleeve 2b with the upper flange 21b as shown in FIG. Is a method of forming a lower flange 23b (to be exact, a bending portion) by bending. Originally, since it is a circular hole drilled in the circular pipe (cast iron pipe) 1b, the circular hole edge is not a straight line but a curved surface, and the lower end of the cylinder is pushed along this circular hole edge to bend the lower flange evenly. It is said that it is difficult to form it unless there is a pressing portion that can freely select the points of action in the front, rear, left, right, and up and down as in this configuration.

[0006]

FIG. 6 is a vertical sectional front view showing an example of the prior art. However, the structure is not limited to the one shown here and the bottom surface of the water faucet placed on the outer circumference of the cast iron pipe. It is unavoidable that some gap is formed between the cast iron pipe and the cast iron pipe. That is, the outer peripheral surface 12b of the cast iron pipe 1b is, needless to say, circular, but eccentricity up to a certain limited value, bending in the pipe axis direction, etc. are allowed, while the saddle 4b of the water faucet is usually standard. The size is fixed and is constant regardless of the diameter of the branch pipe, and the adjustment of the diameter corresponding to the difference in the diameter of the branch pipe is performed by changing the diameter of the shaft hole of the water faucet screwed into the water faucet saddle. ing. However, as mentioned above, since the circular hole edge of the circular hole drilled in the circular pipe is formed by a curved line, it is technically quite difficult to accurately transfer the curved bottom face of the water faucet that closely adheres to the circular hole edge. Also, since some unevenness is unfavorable as it causes rattling, it is usually a rubber at the lower part of the screwing saddle 4b and the screwing part of the both which straddles the bottom of the water dipping plug as shown in the figure. The bottom of the shaft hole 32b is kept so that the bottom surface of the water faucet saddle 4 and the outer peripheral surface of the cast iron pipe are kept watertight with the packing 41b interposed therebetween and the water faucet does not rattle due to uneven contact during construction. The bottom surface 35b near the end is provided with a step and is slightly retracted from the outer peripheral surface of the cast iron pipe to intentionally provide a gap C.

[0007] This clearance C has a complicated positional relationship that is difficult to maintain from above once the water faucet saddle 4b and the water faucet 3b that have been integrated are attached.
When the drilling work is performed through the shaft hole 32b of the water faucet and the chips produced by the drill are mixed in the gap C, it is difficult to remove the chips after the drilling, but the water and the chips that have entered the gap are not removed. It is inevitable that they will come into contact with each other, and it is difficult to eliminate the concern that the oxidation reaction will progress due to the oxygen dissolved in the water and the water quality will deteriorate. Also, if the chips generated during drilling flow freely in the gap and damage the corrosion-resistant coating on the outer peripheral surface of the cast iron pipe and the bottom of the water faucet, the skin of the bare metal is exposed and rusting is caused by intensive oxidation. Forming a corroded part E called a bump,
Further, it may become a malicious cause of deteriorating water quality. The cause of poor water quality, which is blamed by the faucet at the end for household use, is a trivial obstacle caused by the downstream side of the pipe, such as the end branch, rather than the basic one caused by the upstream side traced from the main pipeline. It is believed that it is often due to.

In order to solve the above problems, it is an object of the present invention to provide a structure in which a powerful element that causes rusting is removed from a branch hole in a cast iron pipe.

[0009]

The structure of a perforated portion for branching of a cast iron pipe according to the present invention has a structure in which an anticorrosive sleeve with both flanges is fitted into a branch circular hole perforated in a cast iron pipe, and an upper flange of the anticorrosive sleeve is provided. Is for engaging with the circular hole edge on the outer surface of the cast iron pipe and the lower flange is crimped to the inner surface of the cast iron pipe. The spacer 31 contacting the outer peripheral surface of the upper flange 21 of the anticorrosion sleeve 2 is attached to the shaft hole of the water faucet 3. The above problem was solved by fitting the inner peripheral surface of the lower end of 32.

Further, in this structure, the anticorrosion sleeve 2
It is a more desirable embodiment to add a configuration in which at least a part or all of the outer peripheral surface including the inner peripheral surface 13 of the circular hole including the coating surface 22 is coated with the rubber 24.

[0011]

Since the spacer that is in contact with the outer peripheral surface of the anticorrosion sleeve 2 and is fitted in the shaft hole of the water dip is interposed, the gap C and the flow path formed between the water dip bottom surface and the cast iron pipe outer surface pipe Is blocked to prevent water from penetrating into it. Therefore, even if chips are generated in the drilling operation during drilling and remain in the gap C without being removed, since the contact with water is cut off, the opportunity of reaction with oxygen is lost and the oxidizing action does not occur. Absent. For this reason, the water flow is not contaminated due to red rust, and the concern of water quality deterioration due to the structure of the perforated portion is completely eliminated.

[0012]

1 is a vertical sectional front view of an embodiment of the present invention. The anticorrosion sleeve 2 fitted in the circular hole 11 drilled for branching of the cast iron pipe 1 has the upper flange 21 locked to the outer edge of the circular hole, and the covering surface 22 in contact with the inner peripheral surface 13 of the circular hole in a right cylindrical shape. Then, the lower end is pressed and bent to form a lower flange 23, which is press-bonded to the corrosion protection layer 14 such as cement lining or epoxy resin powder coating which is the inner peripheral surface of the cast iron pipe. A rubber packing 41 is interposed between the bottom surface of the water dip plug 3 and the water dip saddle 4 which are integrally screwed onto the outer peripheral surface 12 of the cast iron pipe and the outer peripheral surface of the pipe. And the shaft hole 3 of the water faucet 3
Since the inner peripheral surface 33 of the spacer 31 fitted to the inner surface of 2 is in contact with the outer peripheral surface of the upper flange 21 of the anticorrosion sleeve 2 described above, the water flow in the pipeline passes through the shaft hole 32 to form the gap C. The passage leading to is blocked to prevent inundation. The water dip 3 is omitted in this figure, but the valve body 3 has a spherical outer surface.
Needless to say, it is equipped with a rotary shaft for rotating 4 horizontally and opening and closing the branch pipe, which is also not shown, but is attached in a direction perpendicular to the plane of the drawing.

As for the shape of the anticorrosion sleeve 2, it is desirable to set the width of the upper flange larger than that of the prior art illustrated in FIG. 5 to secure a sufficient contact area with the spacer 31. It is necessary that the length of contact between the two is kept at least 2 mm or more in the vertical direction. The material of the anticorrosion sleeve 2 can be selected from a wide range of copper or copper-based alloys, stainless steel, plastic materials, etc., but as in the embodiment shown in the figure, the lower end of the cylindrical sleeve is pressed and bent to form a lower flange. In the case of the method of forming 23, the copper material is the most advantageous because the workability of the material is a major factor. However, from the viewpoint of corrosion resistance, stainless steel is preferable, and in this case, a jig that can apply a strong forming force, such as a hydraulic jack, is effective. Also, various plastic materials can be used for the purpose of not adversely affecting the water quality, but it is generally difficult to plastically deform the plastic material at room temperature to form the lower flange. It may be necessary to add a heater or the like.

Although the spacer 31 is normally right cylindrical if it is suitable for its purpose, it is desirable that its lower end is located at a distance from the outer peripheral surface 12 of the cast iron pipe. As described above, since the outer edge of the circular hole drilled on the surface of the cylindrical cast iron pipe is not a straight line but a curved line, it is rather difficult to form the spacer tip along this curved line. If the contact surface with the upper flange is sufficiently taken, there is almost no concern that water will enter the gap C. The spacer material may be selected from hard rubber, polyethylene, hard vinyl chloride, plastic materials such as polyacetal, and the like. Since it is desirable that the contact with the upper flange of the anticorrosion sleeve 2 be sufficiently dense to achieve a water-sealing action, it can be said that the crimpability of the hard rubber is a material that can meet expectations in this respect. The elasticity and flexibility of the material are also difficult to throw away.

The spacers 31 are hung on the outer peripheral surface of the anticorrosion sleeve 2 and the inner peripheral surface of the water faucet before the saddle 4 of the water faucet is fastened and fixed to the outer peripheral surface of the cast iron pipe. FIG. 2 is a view showing the bottom surfaces of the water faucet 3 and the saddle 4 which are integrally screwed together before being mounted on the surface of the cast iron pipe, and the spacer 31 is located on the innermost side. When the spacer is fitted in the water faucet in advance, if the material is hard rubber, the position can be determined simply by fitting it on the inner surface of the water faucet, and it is sufficient to mount it on the surface of the cast iron pipe as it is, but in the case of plastic material It is preferable to fill the inside of the water faucet with a hammer and forcibly push it in or to fix it with an adhesive or the like. In any case, once it is mounted on the surface of the cast iron pipe, it is difficult to correct and repair it afterwards, so it is necessary to make sure that it does not come off before mounting. After screwing the water faucet and the saddle together, mount them on the branch point of the cast iron pipe and push the anticorrosion sleeve 2 into the shaft hole using a predetermined jig and slide on the inner peripheral surface of the spacer. The most rational procedure is that the lower flange 23 is formed by pushing the lower end through a jig to reach the lower circular hole 13 while passing through.

FIG. 3 shows another embodiment of the present invention, which is a state of the anticorrosion sleeve before being fitted into the water faucet, that is, a shape before the lower flange 23 is formed by bending. As shown in the figure, there are an example (A) in which only the coating surface 22 of the anticorrosion sleeve 2 is covered with the cylindrical rubber 24, and an example (B) and (C) in which the other surface is also covered. A peculiar function of elastically deforming so that the inner peripheral surface 13 of the circular hole drilled in the cast iron pipe is further brought into close contact with the inner surface 13. In the case of FIG. (C), the rubber has an effect of making close contact not only with the inner peripheral surface of the circular hole but also with the spacer 31 to be fitted, which is one of the extremely preferable embodiments for achieving the object of the present invention. is there.

[0017]

As described above, the structure of the perforated portion for branching the cast iron pipe according to the present invention, when performing the branch piping work without cutting off the water, mixes in the chips of the drill which are feared during perforation. , The prevention of troubles near the end of the water pipe, such as the induction of oxidative action and the generation of red water due to oxidative action, and the effect of preserving the quality of upstream water so that it cannot be ignored. is there. Compared with the conventional technology, without imposing a particularly large construction burden,
It can be evaluated as a suitable example in which a little consideration creates a great sense of trust.

[Brief description of drawings]

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

FIG. 2 is a bottom view of the same example in an intermediate stage.

3 (A), (B), and (C) show longitudinal sectional front views of various embodiments of the anticorrosion sleeve (before execution).

4 (A) and 4 (B) show variations in a vertical sectional front view of a conventional technique.

5 (A) and 5 (B) show variations in a vertical sectional front view of another conventional technique.

FIG. 6 is a vertical sectional front view showing a problem of the conventional technique.

[Explanation of symbols]

 1 Cast Iron Pipe 2 Anticorrosion Sleeve 3 Water Stopper 4 Water Stopper Saddle 11 Circular Hole 12 Outer Surface 13 Outer Surface 13 Circular Hole Inner Surface 14 Cement Lining 21 Upper Flange 22 Covering Surface 23 Lower Flange 24 Rubber 31 Spacer 32 Shaft Hole 33 Inner Surface 34 Valve body 35 Bottom surface 41 Rubber packing C Gap E Corrosion part (rust bump)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ichiro Shiomi 1-12-19 Kitahorie, Nishi-ku, Osaka City, Osaka Prefecture Kurimoto Iron Works Co., Ltd.

Claims (2)

[Claims] 1. An anticorrosion sleeve with both flanges is fitted into a branching circular hole formed in a cast iron pipe, the upper flange of the anticorrosion sleeve is engaged with the edge of the circular hole on the outer surface of the cast iron pipe, and the lower flange is the inner surface of the cast iron pipe. In the branching perforated portion of the cast iron pipe to be crimped to, the spacer 31 that contacts the outer peripheral surface of the upper flange 21 of the anticorrosion sleeve 2 is fitted to the lower inner peripheral surface 33 of the shaft hole 32 of the water faucet 3. A structure of a perforated part for branching a cast iron pipe. 2. The cast iron pipe according to claim 1, wherein at least part of or the entire outer peripheral surface of the anticorrosion sleeve 2 including the covering surface 22 in contact with the inner peripheral surface 13 of the circular hole is covered with rubber 24. The structure of the perforation part for branching.