JP3106386B2 - Pipe end anticorrosion core - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a water supply system using a steel pipe coated with an inner surface and protected against corrosion, such as a polyethylene powder-lined steel pipe or a hard vinyl chloride-lined steel pipe.
Pipe fitting to be needed use in piping systems, such as hot water supply, to a tube end anticorrosion core pipe components such as valves.

[0002]

2. Description of the Related Art In order to prevent the fluid in a pipe from coming into contact with the inner surface of a steel pipe to generate rust, and to prevent the product from dissolving into the fluid and contaminating the fluid, in a piping system for water supply, hot water supply, and the like, In many cases, corrosion-resistant steel pipes, such as polyethylene powder-lined steel pipes and vinyl chloride-lined steel pipes, are used.The pipes and valves connected to these steel pipes are made of these steel pipes. In order to prevent the fluid from being contaminated by generating rust on the uncoated end face, a pipe end corrosion prevention structure is generally used.

FIG. 6 is a partial cross-sectional view showing the use state of an example of a conventional pipe end anticorrosion joint.
This is disclosed as a conventional example in Japanese Unexamined Patent Application Publication No. H11-163873.
This pipe end anticorrosion joint 10 is provided with sleeve portions 12a and 12b made of synthetic resin concentric with the internal threads 11a and 11b, respectively, inside a joint body 11 having tapered internal threads 11a and 11b at both ends. Inner coated steel pipes 13 and 14 screwed into both ends of the joint body 11
Are connected by the internal passages 12c of the sleeve portions 12a and 12b.

[0004] Such a pipe end anticorrosion joint 10 comprises an outer peripheral surface of sleeve portions 12a and 12b and an inner coated steel tube 13 and 1.
4 prevents the fluid in the pipe from leaking due to contact with the inner peripheral surface of the tube.
It is not enough depending on the surface condition, etc., sometimes the fluid in the pipe oozes from this contact surface and generates rust on the pipe end 13b or 14b, and this rust oozes into the pipe from the above-mentioned contact surface and contaminates the fluid in the pipe, Since the joint 10 may be damaged or broken, the pipe ends 13b, 1
Generally, an anticorrosive agent was applied to the pipe ends 13b and 14b so that the fluid did not adhere to 4b, and then the inner surface coated steel pipes 13 and 14 were screwed into the joint body 11.

However, the operation of applying the anticorrosive to the pipe ends 13b and 14b is not only troublesome and troublesome, but also requires skill to completely cover the pipe ends 13b and 14b by applying the anticorrosive. However, there is a problem that workability and reliability are lacking.

FIG. 7 is a partial cross-sectional view showing a pipe end anticorrosion joint devised to solve the above problem, and FIG.
FIG. 8 is a partial cross-sectional view showing a use state of the pipe end anticorrosion joint of FIG. 7, which is shown as an example of the invention in the aforementioned Japanese Utility Model Publication No. 4-25582. 7 and 8, the joint body 21 of the pipe end anticorrosion joint 20 has a tapered internal thread 21a for screwing the inner surface coated steel pipe 22 at the end, similarly to the pipe end anticorrosion joint 10 of FIG. A sleeve portion 23 made of synthetic resin is provided to be fitted into the inner diameter portion 22a of the inner surface coated steel pipe 22.

An annular lip portion 23a having elasticity is integrally provided on the outer peripheral surface of the sleeve portion 23, and the annular recessed portion 2 is provided adjacent to the outside of the base portion of the lip portion 23a.
3b, and a sealing material 24 having elasticity that is deformed by being pressed against the inner diameter portion 22a of the inner surface coated steel pipe 22 is provided in the recessed portion 23b.

FIG. 8 is a partial cross-sectional view showing a state where the inner surface coated steel pipe 22 is screwed into the pipe end anticorrosion joint 20.
When the inner coated steel pipe 22 is screwed into the pipe end anticorrosion joint 20, the inner coated steel pipe 22 pushes the sealing material 24. However, since the sealing material 24 is backed up by the lip 23a, it is pushed over the lip 23a. Without being deformed by pressing against the inner diameter surface 22a of the inner surface coated steel pipe 22, the lip portion 23a is also pressed and bent inward by the deformation, and the elastic force is applied to the sealing material 24, and the sealing material 24 Restoring force by its own elasticity and lip 2
The backing elastic force of 3a presses against the inner diameter portion 22a of the inner surface coated steel pipe 22 to maintain the gap between the inner diameter portion 22a of the inner surface coated steel tube 22 and the sleeve portion 23 in a watertight state.

By the way, the so-called inner surface coated steel pipe is obtained by bonding polyethylene powder to the inner surface of a steel pipe such as a polyethylene powder-lined steel pipe and by bonding a synthetic resin pipe to the steel pipe such as a hard vinyl chloride-lined steel pipe. The thickness of the lining layer is thin in the former and thick in the latter. For this reason, even for the inner coated steel pipe having the same outer diameter, the inner diameter dimension differs depending on the type of the lining layer.

For this reason, the conventional pipe end anticorrosion joint 10 described with reference to FIG.
The outer diameter of the sleeve portion 12a must be different according to the size of the sleeve 14, and if the combination of the dimensions of the steel pipes 13, 14 and the joint 10 is not ensured, the assembly cannot be performed or even if the assembly can be performed. The inconvenience that corrosion protection cannot be performed occurs.

The pipe end anticorrosion joint 20 shown in FIGS. 7 and 8 is a case where the inner surface coated steel pipe 22 is a polyethylene powder-lined steel pipe having a thin lining layer 22a. In the case of a thick vinyl chloride-lined steel pipe having a large thickness, the pipe is excessively deformed to such an extent that the sealing material 24 and the lip 23a are damaged, and the purpose of pipe end corrosion protection cannot be achieved.

For this reason, in the device disclosed in the above publication, as an example, as shown in FIG.
b, lip portions 23a and 23c are provided adjacent to the outside, and the sealing material 24 has a circular cross section made of a material which swells by absorbing water such as aquaelastomer to increase its volume. Is designed to have such a size that the gap between the two lip portions 23a and 23c is not blocked in a state where it is not swollen.

FIG. 9 shows a polyethylene powder-lined steel pipe 22 having a thin lining layer 22a on the pipe end anticorrosion joint 20.
FIG. 4 is a partial cross-sectional view showing a state in which the sealing member 24 is screwed. FIG. 10 is a partial cross-sectional view showing a state after the sealing material 24 has swollen due to water absorption from the state of FIG. 9, and the swollen sealing material 24 seals between the sleeve portion 23 and the inner surface coated steel pipe 22. doing. FIG. 11 is a partial cross-sectional view showing a state in which a hard vinyl chloride-lined steel pipe 25 having a thick lining layer 25a is screwed, and the sealing material 24 is swollen. 23 and inner coated steel pipe 2
5 is sealed.

In the structure for sealing the space between the sleeve portion 23 and the inner surface coated steel pipe 22 or 25 by using a material such as aqua elastomer which swells due to water absorption and increases its volume as the sealing material 24 as described above. Before the seal material 24 swells, fluid passes between the seal material 24 and the inner coated steel pipe 22 or 25 and the pipe end 22 b or 2.
5b and the remaining threaded portion 21b of the tapered inner screw 21a of the joint body 21, which generates rust, which pushes the sealing material 24 and flows out into the fluid to contaminate the fluid. May be damaged or damaged.

[0015]

As described above, the problem to be solved by the present invention is that in the conventional pipe end corrosion protection joint as shown in FIG. 6, the inner peripheral surface of the inner coated steel pipe and the pipe end corrosion protection are not provided. Fluid in the pipe oozes due to imperfections in the shape, size, surface condition, etc. of both contact surfaces with the outer circumference of the sleeve part of the joint, and rust is generated at the end of the pipe. Or the joint may be damaged or damaged.In order to prevent this, it is necessary to have skill to cover the pipe end with an anticorrosive agent. Is lacking. Furthermore, this joint cannot be assembled unless the combination of the dimensions of the steel pipe and the joint is ensured for the inner coated steel pipe having a different inner diameter due to the different thickness of the inner lining layer,
The problem is that corrosion cannot be prevented even if assembly is possible.

Further, the pipe end anticorrosion joint shown in FIGS. 7 and 8 is suitable for an internally coated steel pipe having a thin lining layer and a relatively large inner diameter, such as a polyethylene powder-lined steel pipe. An internally coated steel pipe with a thick lining layer and a relatively small inner diameter, such as a steel pipe, is excessively deformed to such an extent that the sealing material and the lip are damaged, and has a problem that the function of preventing pipe ends is reduced. doing.

In particular, FIGS. 9 to 1 which are examples for coping with the problems of the pipe end anticorrosion joint shown in FIGS. 7 and 8 described above.
In the pipe end anticorrosion joint shown in FIG. 1, a sealing material composed of a material which swells due to water absorption such as aquaelastomer and remarkably increases its volume is swollen by water absorption to form an inner surface coated steel pipe and the pipe end anticorrosion joint. Before sealing the space,
The fluid adheres to the pipe end and the remaining thread, causing rust to be generated in these portions, and the rust contaminates the fluid and damages or breaks the joint.

[0018]

The pipe end anticorrosion core of the present invention is for solving the problems of the above conventional pipe end anticorrosion joint, and can be applied to other pipe parts such as valves. To achieve this, the following configuration was adopted. That is, the present invention provides a substantially cylindrical core book made of synthetic resin.
Fittings such as fittings and valves on the outer peripheral surface on the inner end side of the body
Of the external thread to be screwed into the internal pipe thread of the product body
An inner coated steel pipe is provided in front of the outer peripheral end of the core body.
The diameter is large in the direction of screwing into the internal thread for piping.
A tapered portion is formed outside the core body adjacent to the tapered portion.
An outer peripheral groove is formed on the peripheral surface, and the outer peripheral thread portion is formed from the outer peripheral groove.
Up to the outer peripheral surface until the inner surface coated steel pipe is screwed in
And forming a tapered surface portion whose diameter increases.
The cross-sectional shape of the outer circumferential groove is substantially triangular with the inner circumferential surface as the base.
Attach a synthetic rubber sealing material,
And the tapered part adjacent to it are connected by round chamfering,
When screwing the inner coated steel pipe into the inner pipe thread,
The tapered portion is pressed against the inner surface of the surface-coated steel pipe,
Press the sealant at the end of the coated steel pipe to deform it.
To seal fluid leakage in the inner coated steel pipe
Pipe end anticorrosion core.

In this case, the end face of the inner end of the core body is rounded.
It is preferably formed in a funnel or funnel shape.

[0020]

Since the pipe end anticorrosion core of the present invention is constructed as described above, first, this pipe end anticorrosion core is screwed into an internal thread for piping of a pipe part such as a pipe joint, a valve, etc. The inner end is screwed tight so that the inner end is pressed against the bottom of the inner screw. In this case, if a screwing tool is applied to a plurality of grooves or ridges formed on the inner peripheral surface of the pipe end anticorrosion core, the core can be easily and strongly screwed. Further, since the end face of the inner end is formed in a conical shape or a funnel shape, the end face and the bottom of the inner thread for piping of the piping part are pressed against each other with a small area, and therefore, the surface pressure is high, and the pressure is high. Leakage of fluid in the pipe from the part can be reliably prevented. Further, if the recessed step provided on the outer peripheral side of the end face of the inner end is filled with the sealant, leakage can be more reliably prevented.

Next, when the inner surface coated steel pipe is screwed into the inner thread for piping of the pipe end corrosion-resistant pipe part, the lining layer on the inner surface of the inner end of the inner surface coated steel pipe is formed of a core body of the core for corrosion protection . br /> hits the tapered portion diameter formed on the outer peripheral surface end portion is increased, which is compressed and deformed, the state of pressure contact by high pipe end corrosive protection core elastic. Furthermore, when the inner surface coated steel pipe is screwed in, the lining layer on the inner surface of the pipe end presses and deforms the sealing material, and the sealing material comes into pressure contact by rubber elasticity, regardless of the shape, size, surface condition, etc. of the lining surface, This will ensure a tight seal. State In this case, when those lined steel pipe is less thick inner diameter lining layer, sealing material is deformed is sandwiched between the lining layer of the outer peripheral surface and the inner surface-coated steel pipe of the pipe end sacrificial core body However , the end of the outer peripheral surface of this portion of the core body is also a tapered portion having a larger diameter, and the inner surface coated steel pipe is screwed into the core body to make a stronger contact. And even if there is a difference in the screwing depth of the inner surface coated steel pipe, there is no difference in the sealing performance.

Since one or both side surfaces of the outer peripheral groove in which the sealing material is mounted and the outer peripheral surface adjacent thereto are connected by round chamfering, the deformed portion of the pipe end corrosion protection core causes the inner surface of the inner coated steel pipe to be deformed. The lining surface is prevented from being damaged, and the sealing material is prevented from being damaged when deformed.

When the shape of the sealing material is substantially triangular with the inner peripheral surface as the base, the closer the inner peripheral surface of the inner coated steel pipe, the smaller the cross-sectional area, the easier the deformation, and the better the sealing performance.
However, the cross-sectional shape of the sealing material used for the pipe end anticorrosion core of the present invention is not limited to this, and may be other shapes such as a trapezoid, an oval, and a circle. Further, when this sealing material is formed of synthetic rubber, it is excellent in elasticity, chemical resistance, durability and the like. However, depending on the conditions of use, the material is not limited to synthetic rubber, and may be formed of natural rubber or synthetic resin.

As described above, the pipe end anticorrosion core of the present invention is attached to a pipe part such as a pipe joint or a valve, and when the inner surface coated steel pipe is connected, the pipe end is not lined by the fluid in the pipe. Rust is generated at the end of the pipe, and the rust can be reliably prevented from contaminating the fluid inside. In addition, these operations do not require special skills, and have high workability and reliability. Furthermore, the same pipe end corrosion protection core can function sufficiently even for inner coated steel pipes having different inner diameters with different thicknesses of the lining layer of the inner coated steel pipe.

Further, when a pipe end anticorrosion core having the same shape as that obtained by connecting two pipe end anticorrosion cores of the present invention so that their outer ends are both ends is mounted on a straight pipe joint, the mounting operation is performed. And an economical pipe joint can be obtained. Also,
In the present invention, a pipe joint, a valve, and other piping parts provided with the above-described pipe end anticorrosion core are also proposed, but their operations are the same as those described above.

[0026]

FIG. 1 is a partial sectional view showing an embodiment of a pipe end anticorrosion core according to the present invention, and FIG. 2 is a view showing the pipe end anticorrosion core of FIG. FIG. 3 is a partial cross-sectional view showing a mounted state, and FIG. 3 shows a state in which a lining layer such as a polyethylene powder-lined steel pipe having a relatively thin lining layer and a relatively large inner diameter is screwed into the piping part of FIG. FIG. 4 is a partial cross-sectional view showing a state in which an inner coating steel pipe having a relatively thick lining layer such as a hard vinyl chloride-lined steel pipe and a relatively small inner diameter is screwed into the piping part of FIG. 2. 5 is a cross-sectional view showing an example of a pipe joint to which the pipe end anticorrosion core of FIG. 1 is attached. In FIGS. 1 to 5, 1 is a core body of the pipe end anticorrosion core, 2 is a pipe joint, and 3 is a pipe joint. Body of piping parts such as fittings and valves, 4 is sealing material 5 sealant, is lined steel pipe 6, 7 is a lining layer.

The core body 1 for protecting the pipe end is made of a synthetic resin having a high elasticity and has a substantially cylindrical shape. As shown in FIGS. The outer peripheral thread portion 1a of the core body 1 is screwed and mounted on the inner thread 3a for piping of the main body 3, and the sealing member 4 mounted on the outer peripheral groove 1b of the core body 1 is connected to the core main body 1 by piping. Lined inner peripheral surface 7 of inner coated steel pipe 6 in which outer screw 6a is screwed into inner screw 3a for piping of component body 3
a, the fluid in the pipe from the pipe end 6b of the inner coated steel pipe 6
To prevent leakage toward

At the end of the outer peripheral surface of the core body 1, a taper portion 1 j , a taper portion 1 d , and a sealing material having one or more steps of larger diameters than the outer end 1c inserted into the inner surface coated steel pipe 6 are attached. An outer peripheral groove 1b, a tapered surface portion 1e having a larger diameter, and an outer peripheral screw portion 1a are sequentially formed. The outer peripheral screw portion 1a is screwed into an inner screw 3a for piping of the body 3 of the piping component, and the core body 1 is formed. Is mounted inside piping parts such as the pipe joint 2 and the valve.

A plurality of grooves 1f are formed on the inner peripheral surface of the core body 1, and the side surfaces on both sides of the outer peripheral groove 1b and the tapered surfaces 1d and 1e adjacent thereto are round chamfered 1i.
Are tied together. Further, an end 1g of the inner end with respect to the outer end 1c is formed in a funnel shape, and a stepped portion 1h is provided on the outer peripheral side of the end surface 1g, as shown in FIGS. As shown in FIG.
, The step portion 1h is filled with the sealant 5.

The sealing material 4 has a cross-sectional shape substantially equal to the inner peripheral surface 4a.
Is made of synthetic rubber having a substantially triangular shape with a base of, but the cross-sectional shape is not limited to this.

Next, the operation will be described based on the embodiment shown in FIGS. First, the core main body 1 includes a pipe joint 2 and a main body 3 of a piping component such as a valve.
The inner screw 3a is screwed firmly so that the end face 1g of the inner end presses against the bottom 3b of the inner screw 3a. In this case, if a screwing tool is applied to the plurality of grooves 1f formed on the inner peripheral surface of the core body 1, the core body 1 can be easily screwed tightly. Further, since the end face 1g of the inner end is formed in a funnel shape, the end face 1g is formed.
And the bottom part 3b of the inner thread 3a for piping of the body 3 of the piping part are pressed against each other in a small area of the outer peripheral part, so that the surface pressure is high, and leakage of the fluid in the pipe from this pressed part can be reliably prevented. . Furthermore, if the recessed step 1h provided on the outer peripheral side of the end surface 1g of the inner end is filled with the sealing agent 5, leakage can be more reliably prevented. FIG. 2 shows this state.

Next, when the inner coated steel pipe 6 is screwed into the inner screw 3a for piping of the pipe end corrosion-resistant pipe part, the lining layer 7 on the inner surface of the pipe end 6b of the inner coated steel pipe 6 becomes the per out two stages of the diameter of the peripheral surface end portion side is larger taper portion 1d, which was compressed and deformed, the state of pressure contact by the high core body 1 elastic. Furthermore, the inner surface coated steel pipe 6
Is screwed, the lining layer 7 on the inner surface of the pipe end 6b presses and deforms the sealing material 4, and the sealing material 4 comes into pressure contact by rubber elasticity, and the inner peripheral surface 7a of the lining layer 7 is pressed.
Regardless of the shape, size, surface condition, etc., the sealing is ensured. FIG. 3 shows this state. Even if there is a difference in the screwing depth of the inner surface coated steel pipe 6, there is no difference in the sealed state.

In this case, if the inner coated steel pipe 6 has a thicker lining layer 7 and a smaller inner diameter like a hard vinyl chloride-lined steel pipe, the deformed seal 4 is attached to the outer peripheral surface of the core body 1 and the inner coated steel pipe 6. The outer surface of this portion of the core body 1 also has a tapered surface portion 1e having a larger diameter. Will do. FIG. 4 shows this state. Even if there is a difference in the screwing depth of the inner surface coated steel pipe, there is no difference in the sealing performance.

The outer peripheral groove 1b in which the sealing material 4 is mounted
Sides 1 and tapered portion 1 which is an outer peripheral surface adjacent thereto
d and the tapered surface portion 1e are connected by the round chamfer 1i, so that the deformed portion of the pipe end anticorrosion core 1 prevents the inner peripheral surface 7a of the lining layer 7 of the inner coated steel pipe 6 from being damaged. The sealing material 4 is prevented from being damaged when deformed.

When the shape of the sealing material 4 is substantially triangular with the substantially circumferential surface 4a as the base, the inner circumferential surface 7 of the inner surface coated steel pipe 6 is formed.
The closer to a, the smaller the cross-sectional area, the easier the deformation, and the better the sealing performance. However, the cross-sectional shape of the sealing material 4 used for the pipe end anticorrosion core 1 in this example is not limited to this, and may be other shapes such as a trapezoid, an egg, a shell, or a circle. Further, when this sealing material 4 is formed of synthetic rubber, it is excellent in elasticity, chemical resistance, durability and the like. However, depending on the conditions of use, the material is not limited to synthetic rubber, and may be formed of natural rubber or synthetic resin.

In this way, the core body 1 for protecting the pipe end of the present invention from being attached to the pipe parts such as the pipe joint 2 and the valve is connected by the fluid inside the pipe when the inner surface coated steel pipe 6 is connected. Rust is generated at the unlined pipe end of the end 6b, and it is possible to reliably prevent the rust from contaminating the fluid inside. In addition, these operations do not require special skills, and have high workability and reliability. Furthermore, the same tube end anticorrosion core 1 can be used for the inner coated steel pipe 6 having a different lining layer 7 of different thickness and a different thickness of the lining layer 7 of the inner coated steel pipe 6.
Can function well.

[0037]

The pipe end anticorrosion core of the present invention is used by being attached to piping parts such as pipe joints and valves, and is used in a piping system for water supply or hot water supply using an internally coated steel pipe. To prevent the fluid in the pipe from touching the end of the pipe that has not been protected from corrosion, thereby preventing rusting and preventing the fluid from becoming dirty due to the rust, and damaging or damaging the piping parts due to rust.

Further, the same pipe end corrosion protection core can be commonly used for an inner surface coated steel pipe having a different lining layer thickness and a different inner diameter. Furthermore, even if there is a difference in the screw-in depth for connecting the inner surface coated steel pipe, there is no difference in the pipe end corrosion protection effect.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing one embodiment of a pipe end anticorrosion core of the present invention.

FIG. 2 is a partial cross-sectional view showing a state in which the pipe end anticorrosion core of FIG. 1 is mounted inside piping parts such as pipe joints and valves.

FIG. 3 is a partial cross-sectional view showing a state in which an inner-coated steel pipe having a relatively thin lining layer and a relatively large inner diameter is screwed into the piping part of FIG. 2;

FIG. 4 is a partial cross-sectional view showing a state in which an inner-coated steel pipe having a relatively thick lining layer and a relatively small inner diameter is screwed into the pipe member of FIG. 2;

FIG. 5 is a sectional view showing an example of a pipe joint equipped with the pipe end anticorrosion core of FIG. 1;

FIG. 6 is a partial cross-sectional view showing a use state of an example of a conventional pipe end anticorrosion joint.

FIG. 7 is a partial sectional view showing a conventional pipe end anticorrosion joint.

FIG. 8 is a partial sectional view showing a conventional pipe end anticorrosion joint.

FIG. 9 is a partial sectional view showing a conventional pipe end anticorrosion joint.

FIG. 10 is a partial cross-sectional view showing a state after the sealing material has swelled from the state of FIG. 9;

11 is a partial cross-sectional view showing a case where the lining layer of the inner surface coated steel pipe is thick in the state of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core end for pipe end corrosion prevention 1a Outer thread part 1b Outer groove 1c Outer end part 1d Taper part 1e Taper surface part 1f Groove 1g Inner end face 1h Step part 2 Pipe joint 3 Body of pipe parts 3a Inner screw 4 Seal material 4a Inner peripheral surface 5 Sealant 6 Inner surface coated steel pipe 6a Outer thread 6b Pipe end 7 Lining layer 7a Inner peripheral surface

Continuation of the front page (56) References JP-A 4-80992 (JP, U) JP-A 6-28492 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16L 15 / 04

Claims (2)

(57) [Claims] 1. A substantially cylindrical core body made of synthetic resin.
On the outer surface on the end side, a book for piping parts such as fittings and valves
Provide an outer thread for screwing into the internal thread for piping of the body,
At the outer peripheral end of the core body, an inner coated steel pipe is
Taper part with a large diameter in the direction of screwing into the internal screw
Is formed on the outer peripheral surface of the core body adjacent to the tapered portion.
Forming an outer peripheral groove, and extending from the outer peripheral groove to the outer peripheral thread portion.
Diameter in the direction in which the inner surface coated steel pipe is screwed into the outer peripheral surface
Is formed, and the outer peripheral groove is formed.
The cross-sectional shape is a substantially triangular composite
With a seal material made of rubber
Is connected to the adjacent taper by round chamfering.
When screwing the coated steel pipe into the internal thread for piping,
The tapered portion is pressed against the inner surface of the steel pipe,
By pressing and deforming the sealing material at the pipe end,
A pipe end anticorrosion core , wherein a fluid leak in a steel pipe covered with an inner surface is sealed . 2. An end face of an inner end of the core body is conical.
The pipe end anticorrosion core according to claim 1 , wherein the core is formed in a funnel shape .