JPS62179921A - Internal lining of bent tube and stretching jig of lining material - Google Patents

Abstract

PURPOSE:To form a smooth lining layer by a method wherein a lining material, which is softened by heating, is slightly stretched with a stretching jig, which is inserted in the interior of the lining material, and then inserted in a bent tube. CONSTITUTION:A fixing piece 13a is fixed to one end of a lining material 4, the other end of which is pinched in a gap formed between a disc 122a and a support plate 121a so as to be clamped with a bolt 123a and in which a stretching jig is inserted. When a core member 11a is axially compressed by turning a handle 141a under the state that the portion, which corresponds to the bent part 62 of a bent tube 6, of the lining material is heated up to a temperature exceeding the softening point of the lining material, so as to bring the core member into a certain contracted dimension, while a slightly elongated state of the interval between the fixing pieces 12a and 13a is developed. The lining material under the state just mentioned above is inserted in the bent tube 6. Because the amount corresponding to that to be compressed is stretched before the insertion of the material, no surface undurations, wrinkle and the like develops even on the contraction side of the bent lining material 4. Finally, heating and pressurizing fluid is poured in the interior of the lining material so as to expand the lining material radially in order to join the lining material onto the inner surface of the bent tube 6.

Description

DETAILED DESCRIPTION OF THE INVENTION (/): Field of Industrial Application) This invention relates to a method and apparatus for lining the inner surface of a curved pipe.

(Prior art) Conventionally, as a method for lining the inner surface of a pipe body having this kind of bent part, the following three cases are known as -ff.
K is known. That is, the first method is disclosed in Japanese Patent Application Laid-Open No. 5A-9
4572, in which a Glastinox tube with a diameter much smaller than the inner diameter of the pipe is heated and softened and inserted into a processing pipe, and the plastic tube is expanded with heated pressurized fluid. This is a method of lining the inner surface of a pipe for processing, and the second method was published in 1977-
As described in Japanese Patent No. 15462, a thermoplastic synthetic resin pipe is heated and softened and processed into a spiral or bellows shape,
This is a method of inserting it into a bent pipe in a softened state and lining it.
As described in Japanese Patent Application No. 9, this method involves inverting a tube in a contracted state so that the inside of the tube is on the outside, and then inserting the tube under pressure into the inner surface of a tube to form a coating.

(Problem that Ijl tries to solve) l, rudder, 1st
In this method, even if walnuts and wrinkles occur on the ventral side of the curved part of the plastic tube during insertion, problems such as walnuts and wrinkles do not occur on the chain part because it is inflated to a high magnification and is lined. Due to the high expansion ratio, problems such as peeling due to shrinkage force during cooling and tearing at the back side of the curved portion may occur.

In the second and third methods, squares such as walnuts and wrinkles may occur on the ventral side of the curved portion of the lining layer, which may cause poor adhesion or dead water.

(Means to solve the problem) In view of the various problems mentioned above in this starting 1R, I put walnuts on the curved part.
The object of the present invention is to provide a method for obtaining a flat lining without wrinkles and an apparatus used therein, and the object is to be achieved by having the structure as described in the claims. It is something to do.

(Sakukawa) The lining material stretching jigs A and B of the present invention consist of a shaft having a male thread at the other end of the core member 11 to which the fixing device 12 or F'i12a is attached; 14 or 14a is rotatably attached, and the shaft 14 spans 14
Another fixing device 13 slit 13a is screwed onto the shaft, so simply by rotating the shaft, the lining material fixed between the two fixing devices and heated and softened can be easily stretched in the axial direction. can do.

In addition, the core member of the lining material stretching jig A is a plurality of short tubes connected in a bendable manner, and the lining material stretching jig B has a core member composed of a plurality of rigid rings. Alternatively, since the disks are bendably connected to each other by a thin film, both of the lining material stretching jigs easily bend when subjected to a force from the side in the direction of the pipe axis, so they cannot be inserted into the lining material. It was fixed and the stretching described above was maintained! The lining material can be forced into the bent pipe up to

In the method for lining the inner surface of a curved pipe according to the present invention, when the lining material is bent along the curved part of the curved pipe to be lined, the ventral side thereof is stretched by 8E in advance in the axial direction before insertion. Therefore, even if the lining material is bent during insertion, walnuts, wrinkles, etc. will not occur.

(Example) First, an example of the lining material stretching jig A of the present invention will be described with reference to the drawings. FIG. 1 is a partially cutaway front view of one embodiment of the jig A, in which reference numeral 11 indicates a core member, reference numerals 12 and 13 indicate a fixture, and 14 shafts.

Also, Figure 2 is like Figure 1! It is a cross-sectional view taken along -4 plane.

A plurality of ports 131 are screwed onto the outer periphery of the fixture 13, and the lining material can be attached and removed by pushing and screwing the ports 131 into through holes provided at the ends of the tubular lining material. It has a button so that it can be fixed easily. The fixture 13 has a female threaded hole in its center, and a shaft 14, which is rotatably attached to the end of the core member 11 in the axial direction, is threaded through the female threaded hole.

Furthermore, the tip of the shaft 14 is adjusted so that the shaft 14 can be easily rotated 1°4 in the axial direction.
41 are provided.

1. The fixture 12 attached to the other end of the core member 11 has a circular truncated cone-shaped cross section a122 and a receiving plate 121 having a recess into which the disk 22 is fitted, and is attached and detached by a ring-equipped port 123. It has a structure in which πY is attached freely. ing.

This fixture 12 may have the same structure as the fixture 13 described above, but since the vicinity of the fixture 12 is affected by heating, the end of the lining material Preferably, the structure described above is firmly clamped between the two.

Next, the structure of the core member 11 will be explained in detail.

The short pipe 111 has support rods 113.11 inside its both ends.
3 is constructed in parallel to the diameter direction, and one end of the tube is partially cut out to have an inclined portion 112. The support rod 113 and the inclined portion 112 are provided in parallel directions. It is preferable that the inclined portion 112 be provided in an area slightly less than half the circumference of the short tube 111.

A short tube-shaped connector 114 having a hanging hole 115 that passes through the support rod 113 and an elongated hole 115' that passes through the support rod 113' of the adjacent short tube 111' having the same structure allows the connection between the two Short tube 111. , 111' are connected in the axial direction.

The connector 114 is not limited to a short tube shape, but may be a square or plate shape. The above-mentioned connection structure is defined as a unit structure Y, and the core member 11 is connected to this unit structure Y in the axial direction.

1. The inclined portions 112 must be aligned in the same direction. The length of the core member 11 cannot be determined depending on the length of the curved portion of the curved pipe to be lined.

The unit structure constituting the core member 11 is not limited to the structure described above, but may be composed of the unit structure 2 shown in FIGS. 3 and 4.

The short tubes 21 and 21' of the unit structure Z#- have flat surfaces 22 and 22' formed by cutting out a part of the outer circumferential surface of the tube end. It is connected to ah.

The materials of each member constituting the lining material stretching jig AA are not particularly limited unless they are deformed by heating or do not function properly.

Since the core member 11 is composed of the above-mentioned unit structure, it maintains its rigidity without changing its shape against compressive force in the axial direction, and when it receives force from the lateral direction, the core member 11 maintains its rigidity in one direction. , the flexible member made of the unit structure Y can be bent only in the direction in which the inclined portion is provided, and the flexible member made of the unit structure 2 can be bent only in the direction in which the hinge is fixed.

Next, another embodiment of the lining material stretching jig B) of the present invention will be described with reference to the drawings.

Fig. 5 is a partially cutaway front view of one embodiment of the jig B, in which members other than the core member 11a, that is, the fixtures 12a + 13a and the shaft 14a are connected to the above-mentioned lining. Fixture 12.13 in material stretching jig A
It has the same structure and the same connection mode as the shaft 14. Therefore, the structure of the flexible member 11a will be explained in detail. A plurality of metal rings 31.31.・
... are lined up at intervals, and the surrounding area is covered with a thin cloth film 3.
2, it has a structure in which they can be connected to each other.

In addition to having the above-mentioned structure, the core member may be a ring with a square cross section or a plurality of metal disks arranged at intervals, the periphery of which is covered with a thin film made of cloth, a thin film made of aluminum, etc. A commercially available stainless steel flexible tube having a structure in which the tubes are connected to each other, or a commercially available stainless steel flexible tube in which the side cross section of the tube wall has a shape in which Ω-shapes are connected in the axial direction, is also suitably used.

Since the core member 11a has the structure described above,
When subjected to compressive force in the axial direction, it contracts to a certain extent, but does not contract beyond that and maintains its rigidity, and when subjected to force from the lateral direction, it can easily bend in either direction.

Next, an example of a method for lining the inner surface of a curved pipe for wood will be explained using drawings.

FIGS. 6 and 7 are explanatory diagrams showing the process steps of this FJI method, and B shows the above-mentioned lining material stretching jig B, 4-piece lining material, and 6#-i bent pipe. .

The lining material 4 is a tubular body made of thermoplastic synthetic resin such as hard vinyl chloride resin, and the curved pipe 6 to be lined
It has an outer diameter smaller than the inner diameter. A through hole is made in one throat of the lining material 4 in line with the hole 131a of the fixture 13a, and the hole 131a is screwed into this through hole, thereby forming a part of the lining material 4 in the fixture 13a. 3. The other end of the lining material 4 is heated and softened to reduce its diameter to a dogleg shape, and the chain portion is formed into a circle with a truncated conical cross section * 122 a and a receiving plate having four parts that meet the circle a122 aft. 121a, and the other end of the lining material 4 is firmly clamped in the gap by tightening the ringed bolt 123a.

Only the portion of the lining material 4 into which the lining material stretching jig B is inserted, which corresponds to the curved portion 62 of the curved pipe 6 to be lined, is softened using the heating furnace 5 or directly using a burner or the like. Heat the handle to a temperature above 1
By turning 41a, the core member 11a is compressed in the axial direction. After the core member 11a is compressed and shrinks by a certain distance 4, the distance between the fixtures 12a and 13a increases slightly. In this way, the heat-softened portion of the lining material 4 is slightly stretched in the axial direction.

The degree of stretching (ilt) when the lining material 4 is pushed into the bent pipe 6, the degree to which the ventral side is bent and compressed may be as high as y.

Next, we will explain the process of pushing the lining material 4, which maintains the above-mentioned elongated force, into the curved pipe 6 whose inner surface is coated with adhesive.
I do it. When the bent pipe 6 has a shape in which a bent part 62 is formed at one end of the straight pipe part 61, the heated softened and stretched throat part of the lining material 4 is inserted into the pipe end on the side of the straight pipe part 61. Insert from.

At this time, in addition to pushing, pulling from the opposite side using the ringed bolt 123a of the lining material stretching jig B is also used, if necessary.

In the conventional method, when the heated and softened lining material 4 is bent along the curved portion 62 of the bent pipe 6, compressed walnuts and wrinkles inevitably occur on the ventral side of the lining material 4. However, in this method, since the lining material 4 is stretched by an amount corresponding to the amount of pressure before insertion, even if the lining material 4 is bent along the bent portion 2t2, walnuts, wrinkles, etc. will occur on the ventral side of the lining material 4. Never.

Finally, by injecting heated pressurized fluid into the inside of the lining material 4 by applying a known method, the lining material 4 is
is expanded in the radial direction and adhered to the inner surface of the curved pipe 6 via an adhesive.

Contact? In addition to this method, the curved pipe 6 into which the lining material 4 has been inserted is heated as a whole to foam the heat-foamable adhesive previously applied to the inner surface of the curved pipe 6. A method of adhering the lining 4 to the inner surface of the curved pipe 6 is also preferably used.

FIG. 8 shows the insertion of the lining material 4 into the bent pipe 6 using the lining material stretching jig A.
This is another embodiment of this method.

(Effects of the Invention) As described above, according to the present invention, it is possible to form a smooth lining layer without any walnuts, wrinkles, etc. on the inner surface of a curved pipe.

The internally lined curved pipe thus manufactured does not generate dead water or the like even when liquid is passed through it, so it can be used as a clean pipe for transporting ultrapure water.

Further, since the curved pipe portion can be lined without reducing the thickness of the lining layer so much, the lining layer as a whole can have a uniform thickness.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view showing an embodiment of the lining material stretching jig A of the present invention, and FIG.
FIG. 3 and FIG. 4 are cross-sectional views of main parts showing another embodiment of the lining material stretching jig A. FIG. 5 is a partially sectional front view showing an embodiment of the lining material stretching jig B of the present invention. FIGS. 6 and 7 are diagrams 1111 showing an embodiment of this method for lining the inner surface of a curved pipe in the order of steps,
@8 Figure is an explanation showing another embodiment.

Claims (1)

[Claims] 1. A method of lining the inner surface of a curved pipe with a tubular lining material made of thermoplastic synthetic resin, the stretching of the bendable lining material in which the lining material softened by heating is inserted and fixed therein. 1. A method for lining the inner surface of a curved pipe, comprising the steps of slightly stretching the lining material in the axial direction of the pipe using a tool, and pushing the lining material into the curved pipe while maintaining the stretching. 2. The bent pipe is one in which a bent part is formed at one end of the straight pipe part, and only the part of the lining material corresponding to the bent part is heated and stretched, and this part is drawn from the opening on the side of the straight pipe part. A method for lining the inner surface of a curved pipe according to claim 1, wherein the inner lining is pressed. 3. A fixture 12 for removably fixing the end of the lining material is attached to one end of the core member 11 formed by bendably connecting a plurality of short tubes, and a fixture 12 is attached to the other end of the flexible member 11. A shaft 14 provided with a male thread is rotatably attached to the same axis, and a fixture 13 for removably fixing the other end of the lining material is threaded through the shaft 14. A jig A for stretching lining material used in the method of lining the inner surface of a curved pipe. 4. A short tube in which the core member 11 has at least one tube end partially cut out to have an inclined section, and a support rod is installed inside both tube ends in a diametrical direction parallel to the inclined section. It consists of a unit structure in which a pipe and another short pipe having the same structure adjacent to the short pipe in the axial direction are bendably connected by a connector having a long hole that passes freely through the support rod. 4. The lining material stretching jig A according to claim 3, wherein the sloping portions are aligned in the same direction. 5. The flexible member 11 has a short tube in which a part of the outer circumferential surface of the tube end is made flat, and another short tube having the same structure and adjacent to the short tube in the axial direction, The jig for stretching lining material according to claim 3, characterized in that the jig is composed of unit structures bendably connected by hinges fixed to the surfaces, and the flat surfaces are aligned in the same direction. A. 6. A fixture 12a for removably fixing the end of the lining material is attached to one end of the core member 11a, which is made up of a plurality of rigid rings or disks connected bendably by thin films, and the flexible A shaft 14a provided with a male thread at the other end of the member 11a is rotatably attached to the same axis, and a fixture 13a for removably fixing the other end of the lining material is threaded through the shaft 14a. A jig B for stretching a lining material used to carry out a method for lining the inner surface of a curved pipe.