JPH0442637Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a corrugated pipe connection structure for underdrain drainage.

[Conventional technology] In recent years, corrugated pipes made of synthetic resin, which are lightweight and have excellent earth pressure resistance, have been adopted as underdrain drainage pipes, in which valleys and peaks with water inlets are connected alternately. It's summery. In particular, when burying a small-diameter corrugated pipe with an outside diameter of several tens of millimeters as an underdrain drainage pipe, a special trencher as partially shown in Fig. 7 is used. The small diameter corrugated pipe 100 mentioned above is connected to this trencher, and approximately 100
The drain pipe 101 is a long drain pipe 101, which is wound around the drain pipe 101 and mounted on the drain pipe. Then, at the same time as digging a trench for burying the underdrain drain pipe, the drain pipe 101 is buried while being rolled back, and the rice husk 102 and the like are stored in the drain pipe 101 and discharged from the storage section 103, mechanically and in a short time. Construction work is being carried out to bury underground drainage pipes (hereinafter referred to as the high-speed culvert construction method). Small-diameter corrugated pipes 100 used in the above-described high-speed culvert construction method are connected with a pipe joint 104 as shown in FIG. 8 to form a long drainage pipe 101. That is, the rings 105, 105 are attached externally from both ends, and the notches 106a, 106a are formed in both open ends 106, 106 in advance.
The corrugated pipe 10 is attached to the pipe joint 104 provided with
After inserting 0 and 100 respectively, ring 10
5, 105 in the direction of the open ends 106, 106, the outer circumferential surface of the corrugated pipe 100 is connected to the pipe fitting 1.
04 It is connected by sandwiching it on the inner peripheral surface.

[Problems to be solved by the invention] However, when the corrugated pipe 100 is connected by the pipe joint 104 as described above and used as a long drainage pipe 101 in a high-speed culvert construction method, the drainage pipe 101 of the trencher is not delivered properly. Guide part 107
The pipe joint 104, which is the connection part of the corrugated pipe 100, may get caught on the rollers 108 and the like. In this case, when the ring 105 is moved toward the center of the pipe joint 104, the notch 106 of the open end 106
a may open and the corrugated pipe 100 may come off from the pipe joint 104. If the corrugated pipe 100 comes off, the undergrounding work must be temporarily stopped and reconnected, and if it is later noticed that the corrugated pipe 100 has come off, the drain pipe 101 that has already been buried must be reconnected over a large area. It became necessary to dig up and reconnect the corrugated pipe 100,
The problem was that it was a very time-consuming task.

[Means for Solving the Problems] In order to solve the above problems, the connection structure of the corrugated pipe for underdrain drainage of the present invention is such that the connection structure of the corrugated pipe for underdrain drainage has a connection structure in which valleys and peaks in which water inlets are bored are connected alternately. The open end of the corrugated drainage pipe is fitted onto both ends of a pipe joint having protrusions formed on the outer peripheral surface, and the protrusions of the pipe joint are engaged with the inner surface of the crest of the corrugated pipe, and the It is characterized by having a bifurcated pin leg fitted into the water spout.

[Effect of the invention] In the above connection structure, corrugated pipes for underdrain drainage are fitted from both ends of the pipe joint, so
There is no difference in level caused by the pipe joint on the outer peripheral surface of the connection part of the corrugated pipe. Therefore, even if a long drainage pipe connected by the pipe joint is used for high-speed underdrain construction, the pipe joint will not get caught on the rollers of the trencher's delivery guide, so the corrugated pipe There is no need to worry about it coming off the pipe joint, and work efficiency is greatly improved. In addition, even if the corrugated pipe tries to come out of the pipe joint, the leg of the bifurcated pin fitted into the water inlet will catch on the protrusion of the pipe joint, so the corrugated pipe will be connected securely without worrying about it coming out. .

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

Fig. 1 is an exploded perspective view showing an embodiment of the connection structure of corrugated pipes for underdrain drainage according to the present invention, Fig. 2 is a front view with a main part cut away of the same embodiment, and Fig. 3 is an A of Fig. 2. - shows a schematic cross-sectional view along line A;

In the figure, 1 is a corrugated pipe for underdrain drainage molded from synthetic resin such as polyethylene or vinyl chloride. Annular peaks 2 and valleys 3 are connected alternately, and the valleys 3 are arranged at equal angular intervals. A water outlet 4 is drilled in the hole. Reference numeral 5 denotes a pipe joint made of synthetic resin such as polyethylene or vinyl chloride, and the opening end portions 1a, 1 of the corrugated pipe 1 are connected from both ends thereof.
A is fitted externally. An annular protrusion 6 that is engaged with the inner surface of the crest 2 of the corrugated pipe 1 is provided on the outer circumferential surface of the pipe joint 5, and an annular rib 7 is formed on the outer circumferential surface of the central portion. The outer diameter of the pipe joint 5 excluding the protrusion 6 is formed to be slightly smaller than the inner diameter of the trough 3 of the corrugated pipe 1.

The protrusion 6 is formed so that the center side of the pipe joint 5 becomes an engagement surface 6a that rises substantially vertically, and has a substantially right triangular shape that slopes smoothly toward the end of the pipe joint. There is. When the protrusion 6 is formed into the above shape, when the open ends 1a, 1a of the corrugated pipe 1 are externally fitted from both ends of the pipe joint 5, the engagement surface 6a of the protrusion 6 is attached to the inner surface of the peak 2 of the corrugated pipe 1. There is an advantage that the corrugated pipe 1 is easily engaged, and the corrugated pipe 1 fitted outside is difficult to come off.

Then, the legs 11 of the bifurcated pins 10 made of synthetic resin such as polyethylene or metal are fitted into the water holes 4 bored in the valleys 3 of the corrugated pipe 1, as shown in FIG. , the pin 1 is placed between the outer peripheral surface of the pipe joint 5 and the inner peripheral surface of the valley of the corrugated pipe 1.
0's foot portion 11 is positioned. When the leg portion 11 of the pin 10 is inserted through the water inlet 4 in this manner, the engagement between the inner surface of the peak portion 2 of the corrugated pipe 1 and the protrusion 6 of the pipe joint 5 is released, as shown by the arrow in FIG. Even if the corrugated pipe 1 tries to come out, the leg part 11 of the pin 10 is caught on the engagement surface 6a of the protrusion 6 of the pipe joint 5, making it difficult for the corrugated pipe 1 to come out from the pipe joint 5.

Incidentally, it is not necessary to fit the pins 10 into all the water holes 4..., but if the pins 10 are fitted into at least one water hole 4 of each corrugated pipe 1, the corrugated pipe 1 can be prevented from coming off. Also, pin 1
The pin 13 is not limited to one in which the leg portions 11 of the pin 0 are parallel, but may be a bifurcated pin 13 in which the leg portions 12 are crossed, as shown in FIG. Pin 13 like this
Now, if you pick the tip of the foot 12 with your fingertips and insert it into the water inlet 4, when you release your fingertips, the restoring force of the foot 12 will easily connect the outer circumferential surface of the pipe joint 5 and the inside of the valley of the corrugated pipe 1. The leg portion 12 of the pin 13 is placed between the circumferential surfaces.
You will be able to position the Further, the shape of the head of the pins 10, 13 is
Any shape is sufficient as long as it does not pull the engaging surface 6a of the protrusion 6 of the pipe joint 5 inward from the water port 4 when the corrugated pipe 1 tries to come out when it is fitted into the water port 4. Furthermore, pins 10 and 13
It is preferable that the head of the corrugated pipe 1 does not protrude from the outer circumferential surface of the peak 2 of the corrugated pipe 1, since there is no problem of the pins 10, 13 being caught or falling out even when used in the above-mentioned high-speed underdrain construction method using a trencher.

With the above-mentioned connection structure, the open ends 1a, 1a of the corrugated pipe 1 are sequentially fitted from both ends of the pipe joint 5, and the pins 10 are fitted into the water passage ports 4 as appropriate to drain water from a long underdrain. When made into a pipe, it is wound and mounted on the trencher described above (see Figure 7), and used for burying underground drainage pipes using the high-speed culvert construction method. In this case, since there is no step on the outer circumferential surface of each connection part of the corrugated pipe 1 that protrudes from the peak part 2 of the corrugated pipe 1 due to the pipe joint 5, the rollers of the delivery guide part of the trencher etc. (see Fig. 7) are not formed. ) will not cause the pipe fitting 5 to get caught. Therefore, there is no fear that the corrugated pipe 1 will come off from the pipe joint 5 due to the pin 10 preventing it from coming off, so the work efficiency of the high-speed underdrain method can be greatly improved.

Next, FIG. 6 shows a front view with a main part cut away of another embodiment. In this example, the pipe fitting 8 is injection molded from a synthetic resin such as polyethylene or vinyl chloride, and a projection 9 is provided on the outer peripheral surface of the pipe joint 8 in a substantially right-angled triangular shape in the same manner as in the above embodiment. The engaging surface 9a is engaged with the inner surface of the peak portion 2 of the corrugated pipe 1, and the pin 1
The leg part 11 of 0 is fitted into the water passage port 4. Since the other structures are the same as the connection structure shown in the previous embodiment, the same members are given the same reference numerals and the explanation thereof will be omitted here.

Note that the protrusions provided on the outer peripheral surface of the pipe joint do not necessarily have to be annular and rib-like as in the embodiment, but may be formed in protrusions at equal angular intervals.

[Effects of the invention] As is clear from the above explanation, in the corrugated pipe connection structure for underdrain drainage of the present invention, there is no difference in level caused by the pipe joint on the outer peripheral surface of the corrugated pipe connection part, so it is easy to connect the corrugated pipe. Even when used as a long drainage pipe for high-speed underdrain construction using a trencher, there is no need to worry about the pipe fitting getting caught on the rollers, etc. of the feed guide section of the trencher.
Prevents corrugated pipes from coming off from pipe joints, greatly improving work efficiency. Furthermore, since the pin fitted into the water inlet catches on the protrusion of the pipe joint, it is possible to prevent the corrugated pipe from falling out of the pipe joint.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing an embodiment of the corrugated pipe connection structure for underdrain drainage of the present invention, Fig. 2 is a front view with a main part cut away of the same embodiment, and Fig. 3 is an A--A of Fig. 2.
A schematic cross-sectional view taken along line A, Fig. 4 is a cutaway front view showing an enlarged view of the main parts of the same embodiment, Fig. 5 is a plan view showing the shape of other pins, and Fig. 6 is for underdrain drainage. Fig. 7 is an enlarged side view showing the main part of a trencher, and Fig. 8 is a conventional corrugated pipe connection structure for underdrain drainage. A front view of the main part is shown. Explanation of symbols, 1... Corrugated pipe for underdrain drainage,
1a...opening end, 2...peak, 3...trough, 4
... Water inlet, 5, 8 ... Pipe joint, 6, 9 ... Protrusion, 10, 13 ... Pin.

Claims (1)

[Scope of utility model claims] The open end of a corrugated pipe for underdrain drainage, in which valleys and peaks in which water inlets are drilled, are connected alternately, is fitted from both ends of a pipe joint that has protrusions formed on the outer circumferential surface, and A corrugated pipe connection structure for underdrain drainage, comprising a protrusion that engages with the inner surface of the crest of the corrugated pipe, and a leg of a bifurcated pin fitted into the water inlet.