JP2946324B1 - Collared lining material for branch pipe, method for producing the same, and mold used for the production - Google Patents

Abstract

A lining material with a collar for a branch pipe, which can surely and integrally cure a brim portion of a lining material, is durable, is simple, is easy to manufacture, and can be easily attached. Provided are a production method and a mold used for the production. SOLUTION: In a brim portion of a lining material, a retaining piece (5) formed of a nonwoven fabric is heat-welded to a plastic film (4) having airtightness, and a thermosetting resin is impregnated in a resin absorber (3). A holding piece (12) made of non-woven fabric is heat-welded to a cylindrical plastic film (11) to be used for the bonding, and this holding piece is joined to a collar (18).
And an abutment piece (16) made of non-woven fabric is provided on the upper surface of the brim portion so as to be in contact with an end of the holding piece, and is provided on the surface of the retaining piece (5). An abutting piece (17) is provided, and the brim is integrally fixed with an end of the holding piece (12) located on the brim with a thermosetting resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flanged lining material used for repairing a branch pipe buried underground, a method for producing the same, and a mold used for the method.

[0002]

2. Description of the Related Art When repairing a branch pipe, a tubular nonwoven fabric is impregnated with a thermosetting resin, and an outer peripheral surface thereof is covered with a plastic film having airtightness. For example, a method is used in which the thermosetting resin of the lining material is heated and hardened while being pressed against the inner wall surface of the lining material while being reversed and inserted into the branch pipe.

[0003] The flange of the lining material is provided with a longitudinal cut in the end of the lining material before the lining material is lined, and a piece formed by this is spread outward, and is formed on both sides thereof. A non-woven fabric is applied, impregnated with a thermosetting resin, and cured.

At this time, the airtight plastic film is formed so that the brim portion is cut off so that the film does not exist in the brim portion so that the brim portion is efficiently cured by the thermosetting resin.

However, it takes time and effort to cut off the brim portion of the plastic film, and if external force is applied to the brim portion, cracks, cracks, peeling, etc. may occur at the base of the brim portion. In some cases, unknown water or the like invaded from this part. Especially when using a polyethylene film as a plastic film having airtightness and using an epoxy resin as a thermosetting resin,
This tendency was strong due to poor bonding.

Further, if the thermosetting resin invades the upright portion (upper portion of the base of the collar portion) connected to the flange portion, the base portion of the collar portion is hardened by the thermosetting resin. When mounting a material on a branch pipe, the upright part connected to the collar part may not fit perfectly on the inner surface of the branch pipe.

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above circumstances, and it is possible to surely and integrally cure a flange portion of a lining material, and it is durable, simple and easy to manufacture. Another object of the present invention is to provide a collared lining material for a branch pipe which can easily attach the lining material, a method of manufacturing the same, and a mold which can be conveniently used in the manufacturing thereof.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a method for heat-welding a retaining piece made of a nonwoven fabric or the like to a plastic film having airtightness at a brim portion, and impregnating a resin absorber with a thermosetting resin. The holding portion piece formed of a nonwoven fabric or the like is heat-welded to the end portion of the plastic film used for the thermosetting resin, and the end portion of the plastic film used when impregnating the thermosetting resin is raised from the brim portion of the resin absorber. Attached to the outer periphery of the retaining portion and the outer surface of the brim portion of the resin absorber, a contact portion formed of a nonwoven fabric or the like is provided, and a thermosetting resin is applied to the brim portion. The brim portion is hardened integrally with the end of the holding member so as not to penetrate into the more upright portion.

In addition, a pair of mold bodies is provided as a mold for molding the above-mentioned collar part, and a concave part into which the collar part can be inserted is provided in one of the mold bodies so that the collar part can be hardened stably and easily. A pressing body was provided so that the thermosetting resin did not enter the lining portion rising from the collar portion during curing. Further, the mold main body is divided substantially at the center and formed so as to be disassembled and connectable, so that the lining material can be easily attached and detached, the molding work by the mold can be facilitated, and the mold can be easily moved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A lining body (1) of a lining material is formed in a cylindrical shape with a size such that it is substantially in contact with the inner surface of a branch pipe (2). Before forming a flange portion, as shown in FIG. It is folded flat into two. The lining body (1)
Has a resin absorber (3) formed of a nonwoven fabric or felt or the like that can be impregnated with a thermosetting resin, and an airtight plastic film (4) coated on the outside thereof.
have.

A retaining piece (5) made of nonwoven fabric, felt or the like is heat-welded to the end surface of the airtight plastic film (4) of the lining body (1). A cut (6) is made along the edge to form a brim part (7) (in the illustrated example, the cut is formed halfway through the end of the retaining part, but it fills the entire width. May be provided). In this case, the edge (8) of the lining body (1) has a substantially circular outer periphery on the curved surface of the inner wall of the main pipe (9) when the brim portion is spread outward as described later. It is formed in a curve so as to be attached by.

On the other hand, the tubular plastic film (10) of the outer layer used for impregnating the resin absorber (3) of the lining body (1) with the thermosetting resin is formed before the flange portion is formed.
As shown in FIG. 2, the holding part (11) formed of a nonwoven fabric or felt or the like is overlapped on the inside (it may be overlapped on the outside) at its end, and the overlapped part (1
2) is heat welded. In this case, the end of the holding piece (11) slightly protrudes from the end of the outer cylindrical plastic film (10) to form the extension (13).

The edge (14) of the holding piece (11) is formed in a curved line like the edge of the lining body.

The cut (6) and the edge (8),
(14) can be cut at once using a cutting machine (not shown) or the like in which a cutting blade is erected on the support plate.

When the lining body (1) and the outer cylindrical plastic film (10) are combined to form a flange, the following steps are performed (FIGS. 3 to 5). First,
The end of the lining body (1) shown in FIG. 1 is folded back (reversed) and its collar piece (7) is radially spread outward. Next, the holding piece (11) of the outer cylindrical plastic film (10) is overlapped on the outer periphery of the upright portion (15) connected to the collar piece (7) of the lining body. In this case, the holding piece (11)
The overlapping portion (12) is in an upright state.

The abutting piece on the outer surface (the flange portion surface and the surface of the holding constant piece of the resin-absorbent material), which is formed in each non-woven fabric or felt, etc. of the superposed flange portion piece (7) (1
6) and (17) are provided.

When or when these are superimposed on the extending portion (13) and the abutting portions (16) and (17) of the brim portion (7) and the holding portion (11), a thermosetting The resin is permeated by applying or spraying, and this portion is pressed, heated (heated) and cured to form a brim portion (18). in this case,
The thermosetting resin is the holding piece (11) located at the flange.
Also penetrates into the extension portion (13) to harden the collar portion integrally.

When the thermosetting resin is cured, the outer layer cylinder is prevented so that the thermosetting resin does not enter the overlapping portion (12) of the holding piece (11) or the upright portion (15) of the resin absorber (3). The outer periphery of the upright portion of the plastic film (10) is pressed (FIGS. 4 and 6).

The resin absorber (3), the retaining part (5), the retaining part (11) and the abutment parts (16) and (17) are made of polyester or polypropylene into which a thermosetting resin can enter. , Acrylic, vinylon, nylon or the like, or a non-woven fabric or a felt base. In the embodiment, a polyester non-woven fabric is used.

Further, the above-mentioned airtight plastic film (4) and the outer cylindrical plastic film (10) used for impregnating the resin absorber with a thermosetting resin.
As the material, polyethylene, polyurethane, vinylon, nylon, propylene, vinyl chloride, copolymers thereof, etc. can be used. In the embodiment, polyurethane is used for the airtight plastic film (4). Polyethylene is used for the outer cylindrical plastic film (10).

Furthermore, although an unsaturated polyester resin is used as a thermosetting resin in the embodiment, an epoxy resin, a vinyl ester resin, or the like can be used depending on a material to be joined to the unsaturated polyester resin.

The end of the holding piece (11) and the outer layer of the cylindrical plastic film (10) can be aligned as shown in FIG. It can be provided on the outer peripheral surface of the plastic film (10). In these cases, the lower part of the holding piece (11) located at the collar part (the length corresponding to the extending part) is not pressed, and the thermosetting resin can enter the lower part. I have.
In this way, the end of the holding piece (11) and the abutment piece (16) are formed so as to be in contact with each other, and the thermosetting resin integrally cures the collar together with the end of the holding piece (11). ing.

The formation of the collar portion (18) can be performed using, for example, a pair of molds (19) as shown in FIGS. In this case, the mold (19) is divided almost at its center.

As shown in FIG. 8, the trapezoid mold 20 below the mold guides the lining material with a convex mold body 22 having a curved surface 21 corresponding to the inner wall of the main pipe 9. And a leg base (24) provided appropriately. The curved surface of the mold body (22) is provided with a ridge (26) fixed by fasteners such as screws (25) or welding, etc., and a concave portion around the base of the cylindrical portion.
(27) is formed. The footrest (24) is attached to the upper plate (2
8) and a leg (30) to which this is fixed with a bolt or a screw (29) or the like, and a cutout hole (31) through which a lining material is inserted is provided in the upper plate.

The mold body (22) is provided with a pin (32) on one of its divided surfaces, and a hole on the other surface for engaging this pin.
(33) is formed, and a screw hole formed in the mold body
(34) and the bolt (35) can be disassembled and connected by passing the bolt (35) through the through hole.

As shown in the figure, the mold body (22) is formed by attaching one of the two divided mold bodies to a top plate (28) of the footrest (24) by a fastener such as a bolt (36) or by welding. Although it is fixed and slidably provided without fixing the other mold body, one mold body may be movably provided without being fixed. At this time, the leg stand (24) may be formed so as to be disassembled and connectable like the mold body. In addition,
The other mold body is appropriately provided with a handle (37).

The contact piece (1 ) is inserted into the concave portion (27) of the mold body (22).
Place 7) and apply thermosetting resin to the corresponding parts. At this time, a sheet made of a material which is easily peeled off from the thermosetting resin such as polyethylene may be laid under the abutment piece (17) .

The collar piece (7) of the lining body (1) is placed on the contact piece (17) , and the thermosetting resin is applied on the collar piece.

An end of an outer cylindrical plastic film (10) is attached to the outer periphery of the upright portion (15) of the lining body (1), and the thermosetting thermosetting resin is attached to the upper surface of the brim piece (7). After applying the resin, a patch piece (16) is placed thereon. A sheet like the one laid under the contact piece (17) can be appropriately covered on the contact piece (16) .

Next, a cylindrical pressing body (38) shown in FIG. 11 is fitted around the outer peripheral cylindrical plastic film (10), and the pressing body (38) is fastened with a band (39). The thermosetting resin is prevented from penetrating into the overlapped portion (12) of the holding piece (11) that is thermally welded to the outer cylindrical plastic film. The pressing body (38) has a peripheral surface cut so that its diameter becomes small when tightening, and a sub-plate (40) is provided inside one of the pressing bodies (38) so that the peripheral body can be opened.

In this state, a pressing die (41) as shown in FIGS. 9 and 10 is used as the upper die of the die (19), and the pressing die (41) is placed on the collar portion and pressed. The pressing mold (41) has a curved surface corresponding to the curved surface of the trapezoidal mold main body (22) in the drawing, and has a hole (4
A holding plate (43) formed with 2) and a leg seat engaged with the holding plate;
A push body (45) having (44) is provided. These holding plates
(43) and the pressing body (45) are separate bodies, but they may be formed integrally. The pusher (45) is fixed to the leg (44) by fasteners such as bolts (46) or by welding, etc.In this case, counterbore etc. should be used so that the heads of the bolts etc. do not protrude from the surface of the upper plate. It is provided and formed flat.

The holding plate (43) is provided with a pin (47) on one of its divided surfaces, similarly to the mold body (22), and a hole (48) with which the pin is engaged is formed on the other surface. The bolt (51) is passed through a screw hole (49) and a through hole (50) formed in the mold body, and can be disassembled and connected. The holding plate
A handle (52) is appropriately provided on the upper part of (43).

Next, the collar is heated (heated) while being pressed by the pressing mold (41), and the thermosetting resin applied to the collar is cured. When pressed, the excess thermosetting resin is removed from the mold body.
It is held in the recess (27) of (22).

The heating can be performed by blowing hot air onto the mold body (23) or the holding plate (43), or by providing a heater such as a nichrome wire or a high-frequency device on the mold itself.

The lining material thus formed in advance is attached to the reversing device (53) at the time of construction, and the reversing device is moved through the main pipe (9) to the branch pipe (2).

The position of the outlet (54) of the branch pipe and the reversing outlet (55) of the lining material is adjusted by operating the operating robot car (57) while watching the image sent from the television camera (56). 58), by operating the solenoid valve (59) and moving the reversing device in the flow direction and the circumferential direction of the main pipe.

Here, when the bulging tube (60) of the reversing device is bulged by a fluid pressure such as air, and the brim portion (18) of the lining material is brought into contact with the peripheral portion of the outlet (54) of the branch pipe, the brim portion is formed. Is formed in accordance with the curved surface of the inner wall of the main pipe by the above-mentioned mold, so that the collar portion can be exactly fitted to the periphery of the outlet (54) of the branch pipe.

In this state, the holding pipe (61) in the reversing device (53)
And a lining material (63) housed in a pressure tube (62) connected to the holding pipe from a fluid pressure operated vehicle (65) via a pressure hose (64) by a fluid such as air, water or the like. When pressure is applied,
The lining material is fed into the branch pipe while being inverted.

After the lining material is fed into the branch pipe, the lining material is pressed against the inner wall of the branch pipe by the pressure of air or the like, and hot water or hot air is applied to the lining material in this state. The thermosetting resin impregnated in (3) is cured, and thereby the lining material is lined with the branch pipe.

[0040]

According to the present invention, as described above, the retaining piece is heat-welded to the flange of the cylindrical plastic film having airtightness, and the holding piece is thermally welded to the end of the outer cylindrical plastic film. and, and equipment in a position raised from the flange portion thereof hold pieces, the resin absorbent body and abutting pieces on the surface of the retaining piece of the flange portion is provided, thermosetting the flange portion which is formed in this way giving rESIN, which was so as to integrally fix the flange portion with the end portion of the hold pieces positioned on the flange portion in the portion raised from the flange portion so as not to give the thermosetting resin Therefore, the brim portion and the base thereof are not cracked, cracked or peeled off, and are durable, so that unknown water or the like does not enter through the brim portion or the base.
In addition, since the portion rising from the brim portion is not hardened, the lining material can be easily mounted and can be mounted exactly.

Further, the collar portion can be easily formed by a pair of molds having curved surfaces corresponding to the inner wall of the main pipe, and a concave portion for accommodating the collar portion is formed in the mold. The excess curable resin that has flowed out due to the pressing of the mold can be temporarily retained in the recess.

Further, since the mold is divided, it is easy to attach and remove the lining material when processing the collar portion of the lining material, and to easily move and work even if the whole mold becomes considerably heavy. Can be.

[Brief description of the drawings]

FIG. 1 is a plan view showing an end of a lining body to which a retaining piece is thermally welded.

FIG. 2 is a plan view showing an end of a cylindrical plastic film of an outer layer to which a holding piece is heat-welded.

FIG. 3 is an exploded perspective view showing a configuration of a flange portion of the lining material.

FIG. 4 is a partially enlarged cross-sectional view showing a configuration of a brim portion of a lining material.

FIG. 5 is a partially enlarged cross-sectional view showing a configuration of a brim portion of a lining material of another example.

FIG. 6 is a cross-sectional view showing a case where a brim portion of the lining material is formed by a mold.

FIG. 7 is a perspective view of a mold.

FIG. 8 is a perspective view showing a trapezoid.

FIG. 9 is a perspective view of a holding plate.

FIG. 10 is a perspective view of a push body.

FIG. 11 is a perspective view of a pressing body.

FIG. 12 is a schematic view showing a state where the lining material is transferred to the branch pipe opening by the reversing device.

FIG. 13 is a partially enlarged cross-sectional view showing a state in which the lining material is attached to the reversing device, and the flange of the lining material is attached to the outlet peripheral portion of the branch pipe by the bulging tube of the reversing device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Lining body 2 Branch pipe 3 Resin absorber
4 Airtight plastic film 5 Retaining piece 6 Break 7 Flange piece 10 Outer layer cylindrical plastic film 11 Retaining piece 13 Extending part 15 Standing part 16, 17 Abutment piece 18 Flange part
19 type 20 unit type 38 Pressing body 41 Pressing type

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16L 58/10 B29C 63/36 F16L 55/16

Claims (6)

(57) [Claims] An inner surface of a tubular resin absorber formed of a nonwoven fabric or the like is covered with an airtight tubular plastic film, and an outer surface of the resin absorber is covered with an outer cylindrical plastic film. In a lining material having a flange portion formed at an end portion, a retaining portion piece formed of a nonwoven fabric or the like which is heat-welded to the surface of the cylindrical plastic film having airtightness is provided on the flange portion, and the cylindrical plastic of the outer layer is provided. A holding portion made of a non-woven fabric or the like which is thermally welded is provided at an end portion of the film, and the holding portion is placed on an upright portion connected to the collar portion, and the holding portion piece is provided on a surface of the resin absorber of the collar portion. A contact piece made of non-woven fabric or the like is provided so as to be in contact with the end of the holding piece, and a contact piece made of non-woven fabric or the like is provided on the surface of the retaining piece, and a thermosetting resin is applied to the brim portion to provide the holding piece. Located at the brim A lining material with a brim for a branch pipe, wherein a brim portion is integrally fixed together with an end portion to be formed. 2. The lining material with a collar for a branch pipe according to claim 1, wherein an end of said holding portion piece extends slightly from an end of said cylindrical plastic film of said outer layer. Wherein the inner surface of the formed cylindrical resin-absorbent material non-woven fabric or the like is coated with a plastic film tubular having airtight to form the lining body, care of the lining body
A retaining piece made of a nonwoven fabric or the like is heat-welded to the end surface of a dense cylindrical plastic film, and a plurality of cuts are made along the longitudinal direction at the end of the heat-sealed lining body to form a flange. A tubular plastic film of an outer layer used for forming a part, partially reversing the end side of the lining body and radially expanding the brim part, and impregnating the resin absorber with a thermosetting resin; A holding piece formed of a nonwoven fabric or the like is superimposed on the end surface of the non-woven fabric, and the overlapped portion is heat-welded. On the surface of the brim portion, affixing a holding member formed of a non-woven fabric or the like so as to sandwich the retaining portion and the resin absorber, penetrate the thermosetting resin into the brim, press it, and heat it. Collar of holding piece Method of manufacturing a branch pipe for flanged lining material, characterized in that so as to cure integrally the flange portion with an end portion located. 4. The production of a lining material with a collar for a branch pipe according to claim 3, wherein said holding piece is partially extended to an end surface of said cylindrical plastic film of said outer layer and an overlapped portion thereof is heat-welded. Method. 5. A pair of mold bodies having curved surfaces corresponding to the inner wall of the main pipe, and one of the mold bodies is provided with a tubular portion for supporting an inverted end of a lining material, and a periphery of a root of the tubular portion. A flange for a branch pipe provided with a concave portion for supporting the flange portion of the lining material in an expanded state, and provided with a cylindrical pressing body which can be circumferentially opened so as to press the outer periphery of an upright portion connected to the flange portion of the lining material. Mold used for manufacturing lining materials. 6. The apparatus according to claim 5, wherein said mold body is divided substantially at the center, and means for connecting said divided mold bodies in a disassembly manner is provided.
A mold used for manufacturing the lining material with a collar for a branch pipe described above.