JPH02129490A - Joint structure for spiral tube - Google Patents

Abstract

PURPOSE:To aim at the simplification of execution excellent in watertightness by attaching a cut-off block to a root part of a tube end outer circumference, interrupting this root part, clamping seal packing attached astride both tube ends butted with a slit body, and pressing an inner circumferential surface to a crest part and the cut-off block under pressure. CONSTITUTION:A cut-off block 2, coating a sealant on the outer circumference of a core member of almost the same sectional form as sectional form of a root part 12 with rubber or plastic material, is fitted in this root part 12 of the tube end outer circumference of a spiral tube 1. In this connection, height of the cut-off block 2 is made so as to be flush with a crest part 11, both ends of the spiral tube 1 are butted to each other, seal packing 3 is fitted astride both tube ends, and a split cylinder 4 is clamped to the outer circumference, then an inner circumferential body of the spiral packing 3 is pressed to the crest part of the spiral tube 1 and the cut-off block 2 under pressure. Therefore it is excellent is watertightness and piping at a site is simply performable.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a joint structure for a spiral pipe used as a protection pipe for electric cables, telephone lines, etc.

(Prior art) As a joint structure of this type of protection tube, for example,
Publication No. 50458 discloses that tube bodies having corrugated grooves in the tube circumferential direction are butted together, a sealing material is embedded in the corrugated grooves at the ends of each tube to form a flat surface on the outer periphery of the tube ends, and then both tubes are connected. A joint has been proposed in which a rubber ring is attached across the end, and the outer periphery of the rubber ring is further tightened with a coupling band.

(Problem to be Solved by the Invention) However, with such a joint, it is extremely troublesome to embed a sealing material in the corrugated groove of the pipe body to form a flat surface on the outer periphery of the pipe end at the piping construction site. .

The present invention solves this problem and provides a spiral pipe joint that can be easily installed on site and has excellent water tightness.

(Means for Solving the Problems) The joint structure of the present invention has a structure in which when connecting spiral pipes in which peaks and valleys are spirally provided at a predetermined pitch, the outer periphery of the end of each pipe is Attach a water stop block to the valley to partially block the spirally continuous valley. Then, a cylindrical seal packing is installed across both pipe ends, and the outer circumferential surface of the seal packing is tightened with a split cylinder, thereby pressing the inner circumferential surface of the seal packing against the peak and the water stop block. It is characterized by the fact that

In addition, in the joint structure of the present invention, when connecting a spiral pipe in which peaks and valleys are spirally provided at a predetermined pitch and a pipe, the water stop block is placed in the valley on the outer periphery of the end of the spiral pipe. is installed to partially block the spirally continuous trough, and a rubber packing is installed on the outer peripheral surface of the other pipe.

Therefore, by installing a seal packing across both ends of the spiral pipe and the pipe, and tightening the outer circumferential surface of the seal packing with a split cylinder, the inner circumferential surface of the seal packing is attached to the crest, the water stop block, and the rubber packing. It is characterized by being pressed into contact with.

(Function) Tighten the split cylindrical body so that the inner peripheral surface of the seal packing
When pressed against the water stop block, the spirally continuous trough is blocked by the water stop block, thereby preventing rainwater, groundwater, etc. from entering the pipe through the trough.

(Embodiment 1) FIG. 1 is a half-sectional view showing an embodiment of the present invention, in which reference numeral 1 denotes a spiral tube in which peaks 11 and valleys 12 are spirally provided at a predetermined pitch; 2 is a water stop block, 3 is a cylindrical seal packing, and 4 is a divided cylinder.

The water stop block 2 has a core member 21 made of rubber, plastic, or the like having a cross-sectional shape almost the same as the cross-sectional shape of the trough 12 of the spiral tube 1, and a sealing material 22 such as adhesive or putty on the surface of the core member 21. It is coated with As an example of this, the core member 21 is made of hard rubber, and the surface of the core member 21 is covered with a sealing material made of soft rubber.
It may be coated with 2. At this time, instead of covering the entire surface of the core member 21 with the sealing material 22, the surface of the core member 21 is covered with the sealing material 22 all around as shown in the perspective view in FIG. The strip-like protrusion of core member 2
Two to three pieces may be provided at predetermined intervals in the longitudinal direction of the piece.

In the present invention, the water stop block 2 is fitted into the trough 12 on the outer periphery of the end of the spiral pipe 1, and installed so that the height of the water stop block 2 is substantially flush with the peak 11. Next, the ends of this spiral tube 1.1 are butted together, and a cylindrical seal packing 3 is attached spanning both tube ends, and then a divided cylinder 4 is attached to the outer periphery of the seal packing 3.

Therefore, when the outer periphery of the seal packing 3 is tightened with the divided cylindrical body 4, the inner circumferential surface of the seal packing 3 comes into pressure contact with the crest 11 of the spiral pipe 1 and the water stop block 2, and a continuous spiral trough 12 is formed. It is shut off by the water stop block 2. At this time, since the outer periphery of the water stop block 2 is covered with the sealing material 22, the sealing material 22 is in complete contact with the trough 12 and the inner peripheral surface of the seal packing 3, and watertightness is reliably maintained. .

The divided cylinder 4 used in the present invention is a half-split body 4 obtained by dividing a metal cylinder into two in the axial direction, as shown in FIG.
It is preferable to have a structure in which one side edge of 1.41 is hinge-jointed, a flange 42 is provided protruding from the other side edge, and the flanges 42 and 42 can be connected with bolts and nuts. Seal packing 3 by reducing the inner diameter of
The structure is not specified as long as it has the function of uniformly tightening the outer circumferential surface of.

Furthermore, the connecting structure of the present invention is not limited to the above-mentioned connection procedure, but the spiral tubes 1.1 are butted together and then the seal packing 3 is straddled over both tube ends. Tanibe 12 after flipping packing 3
A waterproof backing 2 may be attached to the.

(Embodiment 2) FIG. 8 is a half sectional view showing another embodiment of the connection structure between the spiral pipe 1 and the ordinary pipe 5.

In the case of this embodiment, one spiral pipe 1 and the other pipe 5 are butted against each other, a water stop block 2 is attached to the trough 12 on the outer periphery of the end of the spiral pipe 1, and the end of the other pipe 5 is fitted with a water stop block 2. A rubber packing 6 is attached to the outer periphery of the spiral tube 1, and the outer periphery of the rubber packing 6 and the peak 11 of the spiral tube 1 are connected to each other.
Set so that the outer circumference and the diameter are approximately the same. Therefore, the cylindrical seal packing 3 is installed across both ends of the pipe in the same manner as in the above embodiment, and the split cylinder 4 is mounted on the outer periphery of the seal packing 3. When the split cylinder 4 is tightened, the spiral pipe 1 and the pipe 5 are reliably connected.

(Effects of the Invention) As described above, the present invention can be used when connecting spiral pipes in which the peaks and valleys are spirally provided at a predetermined pitch, or when connecting the spiral pipe and a normal pipe. When doing so, the connection can be easily made by simply attaching a water stop block to the valley on the outer periphery of the end of the spiral tube and then attaching the seal packing and the split cylinder. Moreover, in this case, the spirally continuous valley is completely blocked off by the water stop block, so rainwater, groundwater, etc. do not enter the pipe.

[Brief explanation of the drawing]

Fig. 1 is a half-sectional view of a joint structure showing one embodiment of the present invention, Fig. 2 is a perspective view showing an embodiment of a water stop block used in the present invention, and Fig. 3 is a half-sectional view of a joint structure showing an embodiment of the present invention. It is a half sectional view of a joint structure showing other examples.

Claims (1)

[Claims] 1. Ends of spiral tubes (1), (1) in which peaks (11) and valleys (12) are spirally provided at a predetermined pitch are butted against each other, and the outer periphery of each tube end is A water stop block (2) is attached to the valley (12) to create a continuous spiral valley (12).
By partially blocking the pipe, installing a cylindrical seal packing (3) across both pipe ends, and tightening the outer peripheral surface of the seal packing (3) with the split cylinder (4). A spiral pipe joint structure characterized in that the inner circumferential surface of a seal packing (3) is brought into pressure contact with a peak (11) and a water stop block (2). 2 The end of the spiral pipe (1) in which the peaks (11) and the valleys (12) are spirally provided at a predetermined pitch and the pipe (5)
) and attach a water stop block (2) to the trough (12) on the outer periphery of the end of the spiral pipe (1) to partially block the spirally continuous trough (12). Also, a rubber packing (6) is attached to the outer periphery of the end of the pipe (5), and a cylindrical seal packing (3) is attached across both ends of the spiral tube (1) and the pipe (5). Then, by tightening the outer circumferential surface of the seal packing (3) with the divided cylinder (4), the inner circumferential surface of the seal packing (3) is divided into the crest (11), the water stop block (2), and the rubber packing (6). A spiral pipe joint structure characterized by pressure contact.