JP3074555B2 - How to join pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining technique for connecting large-diameter pipes, fume pipes, plastic pipes, and metal pipes (collectively referred to as pipes in this specification).

[0002]

2. Description of the Related Art A conventional method of joining pipes is to widen one end of the pipe and apply an adhesive to the outer periphery of the pipe to be connected to the other end of the pipe and join the pipe. Heating and expanding the widened rim, press-fitting the other pipe, cooling and tightly tightening, or attaching a flange to each pipe connection rim,
2. Description of the Related Art A method of joining pipes by connecting flanges with bolts via rubber packing or the like is widely known. In the former former joining method, joining cannot be performed unless the pipe end of the pipe is widened, and a widening shaping process is required, which increases the cost. In the latter latter joining method, a flange attaching operation and a bolt tightening operation are required, so that the joining cost is increased and the joining operation takes time and effort.

[0003]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to solve these problems of the prior art, to easily and quickly join even pipes having no width, and to reduce the cost of pipes. It is to provide a joining method.

[0004]

According to the structure of the present invention, which solves the above-mentioned problems, a plurality of annular grooves partially closed are formed on the inner peripheral surface of a short cylindrical body fitted outside a butt portion of a pipe. Provided, a connecting cylinder having a structure in which a communication hole communicating with the outside of the cylindrical body is provided in each groove portion on both sides of the closed portion of the annular groove,
Attach the connecting pipe to one side of the connecting pipe, then insert the mating pipe to be connected into the connecting pipe, arrange the butt end of the pipe at the approximate center of the inside of the connecting pipe, and then glue it from one of the communication holes Injecting the agent into the annular grooves, filling each annular groove with an adhesive, connecting the two pipes and the connecting cylinder integrally with the adhesive with the adhesive in the grooves, and connecting the pipes. In the method of joining pipes. Here, the adhesive of the present invention is an agent material for joining the pipe and the connecting cylinder in a watertight manner at the groove, and is appropriately selected according to the material and size of the pipe. In the case of bonding between plastic materials, a plastic adhesive is used in many cases, a rubber adhesive is used in the case of metal or ceramic pipes, and a mortar / cement solidifying agent is used in the case of concrete / cement pipes.
An annular groove is provided around the entire outer peripheral surface of the pipe for joining.
In the case of an annular one with only one round,
It may be around.

[0005]

According to the present invention, a connecting cylinder having a plurality of annular grooves, a closed portion, and a communication hole on an inner peripheral surface is manufactured and prepared in advance. Next, the connecting pipe is fitted to a portion where the pipes to be connected are abutted, an adhesive is injected from one of the communication holes, and the annular groove on the inner peripheral surface of the connecting pipe is filled with the adhesive. Then, the pipe and the connecting cylinder are bonded to each other, and the two pipes and the connecting cylinder are integrated to join the pipe. The other communication hole of the closed portion of the annular groove serves as an exhaust hole for the air of the annular groove by the injected adhesive, and the injected adhesive is discharged from the communication hole to fill the annular groove. Is for you to understand.

[0006]

Embodiments of the present invention will be described below. This embodiment is an example of a method for joining a large-diameter PVC pipe. FIG. 1 is a plan view of a connecting cylinder used in the embodiment, and FIG.
FIG. 3 is a sectional view taken along line BB of FIG. 1, FIG. 4 is an explanatory view showing a joining step of the embodiment, and FIG. 5 is a longitudinal sectional view of a joint portion of the embodiment. In the drawing, reference numerals 1 and 2 denote large-diameter PVC pipes to be joined, 3 denotes a connecting pipe made of PVC having the same inner diameter as the outer diameter of the same PVC pipe, 4 denotes an annular groove on the inner surface of the connecting pipe, 5
Is a closed portion of the annular groove, 6 and 7 are communication holes, 8 is a plastic adhesive, and 9 is an adhesive injection nozzle. In this embodiment, the connecting pipe 3 is fitted around the outer periphery of the terminal edge of the large-sized PVC pipe 1, and then the other PVC pipe 2 is fitted into the connecting pipe 3,
The PVC pipes 1 and 2 are butted at the center of the connecting cylinder 3.
Thereafter, a plastic adhesive 8 for adhering the PVC pipe well from one of the communication holes 6 is press-fitted from an adhesive injection nozzle 9. The adhesive 8 is sent from the communication hole 6 to the annular groove 4. Air in the annular groove is expelled from the groove 4 and discharged from the communication hole 7. The adhesive 8 fills the annular groove 4 and press-fits the adhesive 8 until it is discharged from the communication hole 7 at the other end of the closing portion 5. As a result, the adhesive 8 is filled in the annular groove 4, and the PVC pipes 1 and 2 and the connecting cylinder 3 are bonded and integrated. In addition, sealing is performed at this portion to maintain waterproofness and airtightness. This joining operation can be performed easily and quickly even in the rain or on a civil engineering construction site.

[0007]

As described above, according to the present invention, there is no need to shape the widened portion at the pipe end, and there is no need to fix the flange to the pipe end and bolt the flange. A simple connection tube and pipe ends can be inserted and an adhesive can be injected, the joining operation can be performed easily and quickly, the construction cost can be reduced, and the operation can be performed without being affected by water and soil.

[Brief description of the drawings]

FIG. 1 is a plan view of a connecting cylinder used in an embodiment.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along the line BB of FIG. 1;

FIG. 4 is an explanatory view showing a joining step of the embodiment.

FIG. 5 is a vertical cross-sectional view of a joint according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 PVC pipe 2 PVC pipe 3 Connecting cylinder 4 Annular groove 5 Closed part 6 Communication hole 7 Communication hole 8 Adhesive 9 Adhesive injection nozzle

Claims (1)

(57) [Claims] 1. A plurality of partially closed annular grooves are provided on an inner peripheral surface of a short cylindrical body fitted outside a butt portion of a pipe, and a plurality of annular grooves are provided on both sides of a closed portion of the annular groove. Prepare a connecting cylinder with a communication hole that communicates with the outside of the cylinder, prepare the connecting cylinder on one side of the connecting pipe, and then insert the mating pipe into the connecting cylinder to butt the pipes The end is arranged in the approximate center of the inside of the connecting cylinder, and then the adhesive is injected into the annular groove from one of the communication holes, each annular groove is filled with the adhesive, and the two pipes are formed with the adhesive in the same groove. A pipe joining method, wherein a pipe is connected by integrally connecting a connecting cylinder.