JPH0557596U - Corrosion resistant material for cast iron pipe ends - Google Patents

Abstract

(57) [Summary] [Purpose] Corrosion protection of cast iron pipes (1) connected by flexible joints. [Structure] The edge portion (6) of the rubber packing (3) is brought into close contact with the pipe end surface (4) of the cast iron pipe (1) without depending on a joint.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a pipe end anticorrosion member for a cast iron pipe such as a drainage pipe buried in the ground.

[0002]

[Prior Art]

 In general, cast iron pipes are cut into arbitrary lengths at piping sites and used, so the corrosion of the pipe end surface of cast iron pipes should be performed by coating synthetic resin or cement like corrosion protection on the inner peripheral surface. I can't. Therefore, in the past, the rubber packing that fits between the receiving end of the joint and the pipe end of the cast iron pipe to be inserted has the edge part that covers the pipe end face of the cast iron pipe integrally formed to face the pipe end face of the cast iron pipe. The edge of the rubber packing was made to be in close contact with the pipe end face of the cast iron pipe on the bottom surface of the socket of the joint.

[0003]

[Problems to be solved by the device]

 However, in the case of the flexible joint as described above, the cast iron pipe is not fixed to the socket of the joint in the insertion / removal direction.Therefore, when actually piped, the edge of the rubber packing is attached to the end face of the cast iron pipe. Cannot be closely attached, and therefore the pipe end surface of the cast iron pipe rusts.

[0004]

[Means for Solving the Problems]

 Therefore, the present invention comprises a synthetic resin retaining ring that fits into the inner end of a cast iron pipe and a rubber packing that fits around the outer periphery of the retaining ring. Cast iron is attached to one end of the retaining ring and the rubber packing. The edge part of the tube that covers the tube end surface is integrally formed, and the other end of the retaining ring that protrudes from the other end of the rubber packing is divided into a plurality of parts in the axial direction, and the other end of the retaining ring has a divergent diameter. Skirt that can contract in any direction is formed, and the skirt is pressed against the inner peripheral surface of the pipe end of the cast iron pipe to fix the snap ring to the cast iron pipe, and the edge of the rubber packing is attached to the pipe end face of the cast iron pipe. Even if the joint or the cast iron pipe is slightly displaced in the pulling direction, the edge of the rubber packing can be kept in close contact with the pipe end surface of the cast iron pipe. This is to ensure reliable corrosion protection of pipe ends.

[0005]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional side view of a pipe end anticorrosion member of a cast iron pipe according to the present invention, and as shown in FIGS. 2 and 3, a composite that fits into a pipe end inner port of a drain pipe (1) which is a cast iron pipe. It consists of a retaining ring (2) made of resin (polycarbonate) and a rubber packing (3) that fits around the retaining ring (2), and drainage is applied to one end of the retaining ring (2) and the rubber packing (3). The edge portions (5) and (6) that cover the pipe end surface (4) of the pipe (1) are integrally formed, and the other end of the retaining ring (2) that protrudes from the other end of the rubber packing (3) has a plurality of ends. It is divided into a plurality of parts in the axial direction through a slit (7a), and the other end of the retaining ring (2) is brought into pressure contact with the inner peripheral surface of the drainage pipe (1). ) Is integrally formed.

FIG. 4 and FIG. 5 show a flexible joint structure. The joint (8) has a receiving port (10) having a flange (9) and an inner port (11) of the receiving port (10). ) A ring-shaped rubber packing (13) that fits into a packing groove (12) formed on the opening edge of), and an inner opening (14) of approximately the same diameter as the inner opening (11) of the receiving opening (10). It comprises a packing retainer (15) and four sets of bolts (16) and nuts (17) that connect the packing retainer (15) to the flange (9) of the receiving port (10) so that it can come in contact with and separate from the flange (9). The end of the circular retainer (18) projecting to one side of the packing retainer (15) facing the (9) is brought into contact with the rubber seal (13), and the inner diameter of the rubber seal (13) is adjusted to the drain pipe (1). The outer diameter is slightly smaller than the outer diameter.

Then, the pipe end of the drainage pipe (1) is penetrated from the inner opening (14) of the packing retainer (15) through the inner opening (19) of the packing (13) so that the inside of the receiving opening (10). After inserting it into the mouth (11), tighten the packing retainer (15) to the flange (9) via the nut (17), so that the retainer (18) of the seal retainer (15) is attached to the rubber seal (13). Is pushed into the packing groove (12), the rubber packing (13) is compressed in the axial direction of the drain pipe (1), and the outer peripheral surface of the rubber packing (13) is packed in the receiving groove (10). (12) The rubber packing (13) is in close contact with the peripheral surface, the inner peripheral surface of the rubber packing (13) is in close contact with the outer peripheral surface of the drain pipe (1), and the pipe end of the drain pipe (1) is received by the joint (8). It is connected to the mouth (10).

The receiving port (10) is formed at one end of the drain pipe (1), and the drain pipe (1) is connected to the drain pipe (1) sequentially by the joint (8).

The drainage pipe (1) is a centrifugal casting product, and the cement (20) is coated on the inner peripheral surface of the drainage pipe (1) with a substantially uniform thickness in the same manner as centrifugal casting. The inner surface is protected against corrosion.

Since the drainage pipe (1) is used after being cut to an arbitrary length at the piping site, the drainage pipe (1) is treated with a cement (20) like corrosion protection on the inner peripheral surface. Corrosion protection of the pipe end surface (4) of the drain pipe (1), which cannot be performed by coating or the like, can be performed by the above-mentioned pipe end corrosion protection member.

That is, Before inserting the pipe end of the drainage pipe (1) into the receiving port (10) of the joint (8), A retaining ring (2) fitted with a rubber packing (3) is fitted in advance to the pipe end inner port of the drainage pipe (1), The end face (4) of the drain pipe (1) is covered with the edge (6) of the rubber packing (3). The retaining ring (2) has this skirt (7) firmly pressed against the inner peripheral surface of the drain pipe (1), Securely fixed to the drain pipe (1), The edge (5) of the retaining ring (2) presses the edge (6) of the rubber packing (3) against the pipe end surface (4) of the drainage pipe (1), Since the edge (6) of the rubber packing (3) is in close contact with the pipe end surface (4) of the drain pipe (1), When connecting the pipe end of the drainage pipe (1) to the receiving port (10) of the joint (8) and after piping, Even if each drainage pipe (1) that is not fixed in the insertion / removal direction moves in the insertion / removal direction (the pipe expands and contracts), The adhesion of the edge portion (6) of the rubber packing (3) to the pipe end surface (4) of the drainage pipe (1) is not weakened, Therefore, without exposing the pipe end surface (4) of the drain pipe (1) to water, The pipe end surface (4) of the drainage pipe (1) is not rusted.

Further, as shown in FIG. 1 and FIG. 3, the outer peripheral surface (21) of the rubber packing (3) which is brought into close contact with the inner peripheral surface of the drainage pipe (1) is formed in an arc shape, which allows Since the outer peripheral surface (21) of the rubber packing (3) can be firmly adhered to the inner peripheral surface of the drain pipe (1) which is difficult to manufacture in a circle, the outer peripheral surface (21) of the rubber packing (3) Water enters between the inner peripheral surface of the drainage pipe (1) and the water flows between the pipe end face (4) of the drainage pipe (1) and the edge portion (6) of the rubber packing (3). It is configured to prevent intrusion.

Further, a semi-circular bulge (22) is formed in a portion of the rubber packing (3) which is in close contact with the outer end of the drainage pipe (1) at the edge (6) of the drainage pipe (1). Since the pipe is cut with a cutter at the piping site, the pipe end surface (4) of the drainage pipe (1), which is the cut end, becomes a rough surface with fine irregularities, and it is cut with a slight inclination to the axis. However, even in this case, the edge portion (6) of the rubber packing (3) can be surely brought into close contact with the pipe end surface (4) of the drain pipe (1).

FIG. 6 shows another flexible joint structure, in which the joint (24) is ringed in a packing groove (27) formed at the opening edge of the inner opening (26) of the receiving opening (25). -Shaped rubber packing (28) is fitted, and the rubber packing (28) is fitted with an edge portion (30) in a ring groove (29) formed on the circumferential surface on the opening end side of the packing groove (27). The rubber packing (28) is formed so that its inner diameter is a predetermined length smaller than the outer diameter of the drain pipe (1). Further, an inward edge portion (31) is formed at the opening edge of the receiving opening (25), and one end surface of the rubber packing (30) is brought into contact with and supported by the inner surface of the edge portion (31) to receive the receiving opening (25). ) To prevent the rubber packing (30) from coming off.

Then, the pipe end of the drainage pipe (1) is inserted into the inner opening (26) of the receiving opening (25) by penetrating the inner end of the rubber packing (28) and inserting it into the receiving opening (25). The rubber packing (28) is compressed and deformed between the inner surface (26) of the inner periphery (26) and the outer peripheral surface of the drain pipe (1), and the outer peripheral surface of the rubber packing (28) is the packing of the receiving opening (25). The inner peripheral surface of the rubber packing (28) adheres closely to the outer peripheral surface of the drain pipe (1), and the inner peripheral surface of the rubber packing (28) adheres to the outer peripheral surface of the drain pipe (1) so that the pipe end of the drain pipe (1) fits into the joint (24) It is connected to the socket (25) of.

Also in the joint (24) structure, before inserting the pipe end of the drainage pipe (1) into the receiving port (25) of the joint (24), the pipe end inner port of the drainage pipe (1) is inserted. By fitting the retaining ring (2) fitted with the rubber packing (3) in advance, the pipe end face (4) of the drainage pipe (1) is protected against corrosion as in the joint (8) structure. It is a thing.

[0017]

[Effect of the device]

 As is apparent from the above-described embodiments, the present invention has a retaining ring (2) made of synthetic resin that fits into the inner end of a cast iron pipe (1) such as a drain pipe, and an outer periphery of the retaining ring (2). It consists of a rubber packing (3) to be fitted, and one edge of the retaining ring (2) and the rubber packing (3) is integrally formed with edges (5) and (6) to cover the pipe end surface (4) of the cast iron pipe (1). In addition, the other end of the retaining ring (2) protruding from the other end of the rubber packing (3) is divided into a plurality of parts in the axial direction, and the other end of the retaining ring (2) is expanded in the diametrical direction. A retractable skirt (7) is integrally formed, and the skirt (7) is pressed against the inner peripheral surface of the cast iron pipe (1) to fix the retaining ring (2) to the cast iron pipe (1). The edge portion (6) of the rubber packing (3) is closely attached to the tube end surface (4) of the cast iron pipe (1) by the edge portion (5) of the retaining ring (2). Even if the joints (8) (24) or the cast iron pipe (1) are slightly displaced in the pulling direction, the edge of the rubber packing (3) is attached to the pipe end surface (4) of the cast iron pipe (1). The part (6) can be always brought into close contact with the cast iron pipe (1), and the pipe end corrosion resistance of the cast iron pipe (1) can be reliably achieved, which is a practical effect.

[Brief description of drawings]

FIG. 1 is a sectional side view of a pipe end anticorrosion member of a cast iron pipe according to the present invention.

FIG. 2 is a bottom view of the retaining ring.

FIG. 3 is a bottom view of the rubber packing.

FIG. 4 is an exploded explanatory view of a joint structure.

FIG. 5 is an explanatory cross-sectional view of a joint structure.

FIG. 6 is a sectional explanatory view of another joint structure.

[Explanation of symbols]

 (1) Drain pipe (cast iron pipe) (2) Retaining ring (3) Rubber packing (4) Pipe end face (5) Retaining ring edge (6) Rubber packing edge (7) Retaining ring skirt

Claims (1)

[Scope of utility model registration request] 1. A synthetic resin retaining ring that fits into a pipe end inner port of a cast iron pipe, and a rubber packing that fits around the outer periphery of the retaining ring. One end of the retaining ring and the rubber packing is a cast iron pipe. The edge part that covers the pipe end face is integrally formed, and the other end of the retaining ring that projects from the other end of the rubber packing is divided into a plurality of parts in the axial direction, and the other end of the retaining ring contracts in a divergent diametrical direction. A free skirt is integrally formed, and the skirt is pressed against the inner peripheral surface of the pipe end of the cast iron pipe to fix the snap ring to the cast iron pipe, and the edge of the rubber packing is attached to the pipe end face of the cast iron pipe. A pipe end anticorrosion member for a cast iron pipe, characterized in that it is configured to be more closely attached to the edge portion.