JPH079624Y2 - Tube lining terminal fixing structure - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal fixing structure for a hard plastic tube lining formed on the inner surface of a tube by applying a heating and pressure expansion method.

[0002]

2. Description of the Related Art Recently, for the purpose of regenerating or protecting existing pipes such as water pipes and gas pipes, it has been recently practiced to heat and pressurize a hard plastic tube from the inside of the pipe to expand it and line it inside the pipe. There is. The hard plastic tube expanded inside the tube by heating and pressurizing from inside heat-shrinks during cooling, of which the diametrical heat-shrinking creates a gap between the tube and the tube lining, and the axial heat-shrinking It is not erased instantly due to friction with the tube, but appears to shrink over time. The gap between the pipe and the tube lining becomes an inflow passage for groundwater when the pipe pressure is low, and causes infiltration of groundwater.When the pipe pressure is high, it becomes an outflow passage for fluid in the pipe and causes leakage of fluid in the pipe. . On the other hand, the axial shrinkage with time gradually exposes the inner surface of the tube end portion and causes a lining failure. Therefore, in such a tube lining tube, it is necessary to take measures to prevent problems after the tube lining is formed.
Conventionally, a preventive measure has been taken by forming a flange on the end of the tube lining and locking it on the pipe end surface, but the formation of the flange requires complicated work and requires considerable experience and skill. There was a problem that was done.

The present invention has been made for the purpose of eliminating such conventional problems.

[0004]

[Means for Solving the Problems] The present invention comprises: (a) The inner surface of the pipe is formed with both end portions of a hard tube lining formed by applying the heating and pressurizing expansion method, and is terminated slightly before the pipe end. A lining terminal portion to be used, (b) a bare pipe portion outside the lining terminal portion, and (c) a pipe loosely installed in the pipe so as to straddle between the lining terminal portion and the bare pipe portion, A tubular metal article having a gutter-shaped edge portion that opens toward the inner surface of the pipe on the entire circumference of both the inner and outer ends. (D) The tubular metal element is fitted and inserted in the outer gutter-shaped edge portion of the tubular metal element in an expanded state. , An outer hollow seal ring having rubber-like elasticity crimped to the inner surface of the bare tube portion on the outer peripheral end side and to the inner surface of the outer gutter-shaped edge portion on the inner peripheral end side, (e) The same expanded state in the inner gutter-shaped edge portion The inner peripheral edge side is inside and the outer peripheral edge side is inside. Inner hollow seal ring with rubber-like elasticity crimped to the inner surface of the gutter-shaped edge, and (f) Inside the inner and outer seal rings, between the tubular metal object and the inner surface of the pipe, and the lining end portion. And a filling and filling layer of a sealing material formed on the end of the tube lining.

[0005]

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a state in which the terminal fixing structure of the present invention is being constructed. The terminal portion b ₁ of the hard plastic tube lining b formed by applying the heating and pressurizing expansion method to the inner surface of the tube a has a tube end a. _It ends a little before ₁ and the pipe end a ₁
And a lining terminal portion b ₁ is a bare tube portion a ₂ without a lining.

The terminal fixing structure of the present invention comprises a tubular metal piece ₁ which is loosely inserted from the bare tube portion a ₂ to the inner portion beyond the end portion b ₁ , and the inner and outer ends of the metal article 1 are provided around the entire circumference. Is formed to have a substantially semicircular cross section and open toward the inner surface of the pipe a, and the outer gutter-shaped edge portions 2 and 2 fit within the outer diameter of the metal 1. The material of the tubular metal piece 1 is preferable because stainless steel does not corrode, but other metal or hard plastic may be used.

The inner and outer seal rings 3, 3'are hollow and have rubber-like elasticity, and are fitted and supported in the gutter-shaped edge portions 2, 2 at both ends of the tubular metal piece 1. The inner diameter of the outer seal ring 3 Kanhadaka section a _2, also the inner sealing ring 3 'has an outer diameter corresponding substantially to the inner diameter of the tube lining b, to the appropriate inflatable structure by an external operation 2 、 Seal ring 3,
3'is provided with injection parts 4 and 4'with a check valve (not shown), and each injection part 4 and 4'is drawn out to the outside via the gutter-shaped edges 2 and 2. Air or other liquid can be applied to the expansion, and in the case of the liquid, a solidified one such as cement milk is suitable. For liquid injection, ring 3,
In order to prevent air accumulation in 3 ',
The rings 3, 3'are preferably provided with air vents 5, 5'with check valves (not shown).

The seal material is composed of inner and outer seal rings 3, 3 '.
Between the tubular metal piece 1 and the bare tube portion a _{2 of the} outer peripheral portion thereof.
In addition, it is filled in the space 7 formed between the tube lining b and the tube lining b. It is preferable that the sealing material is a solidifying material and has adhesiveness to the tube a, the tubular metal piece 1 and the tube lining b. For example, a reaction hardening type epoxy resin liquid is used. In order to fill the gap 7 with the sealing material, an inlet c and an exhaust port d communicating with the gap 7 are provided, and these are provided in the pipe a as shown in FIGS. Alternatively, it may be provided on the cylindrical metal article 1 as shown in FIG.

FIG. 1 shows a state in which a tubular metal piece 1 and seal rings 3, 3'fitted and supported by gutter-shaped edge portions 2, 2 at both ends of the metal piece 1 are inserted to a predetermined portion in a pipe a. Shows.
At the time of this insertion operation, the rings 3 and 3'are not yet expanded, so that this can be easily done with a small insertion resistance.

In the state shown in FIG. 1, a filling material such as cement milk 8 is first injected and filled into the hollow portions of the seal rings 3 and 3'through the injection portions 4 and 4 ', and during this injection and filling operation, air is appropriately removed. The 5'check valve is operated to release air. Injecting and filling operation, the operating pressure reaches a predetermined pressure,
It stops when sufficient expansion of the rings 3, 3'is confirmed. By the expansion of the rings 3 and 3 ', the tubular metal piece 1 is firmly fixed to the pipe a side through the rings 3 and 3'. At the same time, due to the expansion of the inner ring 3 ', the end of the tube lining b is
The inner ring 3 ', the tube lining b and the tube a are joined and integrated by tightening the tube a.

Next, the tubular fitting 1 and the bare tube portion a _{2 on the} outside thereof.
In addition, a sealing material, for example, a reaction hardening type epoxy resin liquid, is injected and filled through the injection port c into the space 7 generated between the space 7 and the tube lining b. It is discharged to the outside. After the injection filling layer 6 of the sealing material is formed in the gap 7, the injection port c
Also, a screw plug (not shown) is applied to the exhaust port d to form the layer 6
The terminal fixing structure of the present invention can be obtained by measuring the curing and solidification. The injection filling layer 6 of the sealing material seals the circumferential gap 7, and at the same time, the tubular metal 1, the tube lining b, and the tube a are bonded and integrated.

The tube lining b is formed by applying the heat and pressure expansion method and has a tendency to shrink with time in the axial direction of the tube, but the lining b expands with respect to the tube a by the expansion of the inner seal ring 3 '. At the same time as being strongly tightened, it is bonded and integrated with the inner surface of the pipe a by the injection filling layer 6 of the sealing material, so that the dimensional accuracy in the length direction can be maintained as it is, regardless of such a shrinkage tendency.

Further, a heat shrinkage of the tube lining b in the radial direction of the tube causes a gap (not shown) between the tube lining b and the inner surface of the tube a. This gap is tightened by the inner seal ring 3'at the end of the lining. And the function as a seal of the injecting and filling layer 6 formed in the circumferential gap 7, it is completely sealed, so that there is a risk that groundwater may infiltrate or fluid in the pipe may leak through such a gap. Can be wiped out.

In the present invention, for the purpose of preventing the tubular metal piece 1 from moving inwardly of the tube a, as shown in FIG. A flange portion 1a that stops can be provided.

[0016]

[Effects] According to the fixing structure of the present invention, the end portion of the tube lining can be fixed easily and reliably by using the cylindrical metal member, the seal ring and the sealing material without the need of experience or skill. Improved fixing performance and simplification of fixing work can be achieved at the same time.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a situation during construction of a terminal fixing structure of the present invention.

FIG. 2 is a vertical sectional view showing an example of a terminal fixing structure of the present invention.

FIG. 3 is a view corresponding to FIG. 1 showing another embodiment of the present invention.

FIG. 4 is a view corresponding to FIG. 1 showing still another embodiment of the present invention.

[Explanation of symbols]

 1 Cylindrical hardware 2 Gutter-shaped edge 3 Seal ring 4 Injection part 5 Exhaust part 6 Injection filling layer of sealing material 7 Circumferential gap

Claims (1)

[Scope of utility model registration request] (A) A lining terminal portion which constitutes both ends of a rigid tube lining formed by applying a heating and pressure expansion method on the inner surface of the tube, and is terminated slightly before the tube end, (b) The bare pipe portion outside the lining end portion, (c) is installed in the pipe in a loosely inserted state so as to straddle between the lining end portion and the bare pipe portion, and is provided along the entire circumference of the inner and outer ends. A tubular metal product having a gutter-shaped edge portion that opens toward the inner surface of the pipe, (d) The tubular metal member is inserted into the outer gutter-shaped edge portion under an expanded state, and the outer peripheral end side is the bare pipe portion. An outer hollow seal ring with rubber-like elasticity, the inner peripheral edge side of which is crimped to the inner surface of the outer gutter-shaped edge, respectively. (E) The same, which is inserted into the inner gutter-shaped edge under expansion. The outer peripheral edge side is the inner surface of the lining end and the inner peripheral edge side is the inner surface of the inner gutter-shaped edge. The inner hollow seal ring having rubber-like elasticity attached, and (f) the injection of the seal material formed in the circumferential gap between the tubular metal object and the pipe inner surface and the lining end portion between the inner and outer seal rings. A terminal fixing structure for a tube lining, which is provided with a packed layer.