JPH0440072Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a joint for connecting half-split pipes used when repairing conduits made of asbestos pipes for accommodating underground cables.

[Prior Art] FIGS. 6 and 7 schematically show underground pipelines, and FIG. 7 is an enlarged cross-sectional view along the line shown in FIG. 6.

In this figure, 1 is a plurality of asbestos pipes, and 2 is a power cable housed inside the pipes.

Further, each of the pipes 1 described above is embedded in concrete 3 formed underground, and manholes 4 are provided at regular intervals as shown in FIG.

In order to repair the above ground underground conduit that houses the power cable 2, a trench is dug from the ground to reach the conduit, the concrete 3 is exposed and crushed, and the asbestos pipe 1 inside is also crushed. Remove.

Then, the suspended power cable 2 is covered with half tubes from above and below, and tightened with a tightening band to form a pipe.

[The problem that the idea attempts to solve]

As mentioned above, there is no special fitting for connecting pipes that are tightened with a tightening band or the like. For this reason, a common semicircular joint for pipes is used, and both ends of the joint are tightened with bolts and nuts, which poses problems in terms of watertightness, strength, workability, etc.

Furthermore, the one described in Japanese Utility Model Publication No. 50-2091 is a fastener in which a band-shaped joint main body is provided with protrusions having a dovetail cross section at both ends, and a dovetail groove is provided to engage with both protrusions. Although this joint is used to fasten both ends of the joint body, it is not designed for use with half-split pipes, so even if it is used to connect pipes made of half-split pipes, complete watertightness cannot be obtained.

The object of this invention is to solve the problems of the conventional joints as described above and to provide an excellent joint exclusively for use with half-split pipes.

[Means to solve the problem]

In order to solve the above problems, this invention consists of a pair of left and right semicircular joint bodies and a plate-shaped connecting member that connects each joint body. An engagement groove extending over the area and a protrusion that engages with the engagement groove are provided, and an insertion hole into which the connection member is inserted is formed in each of the protrusions provided on the outside of the other side edge of both joint bodies. A wide head is provided at one end of the connecting member, and a backlash prevention protrusion is provided on the side surface of the member, and when the connecting member is inserted into the insertion hole of both joint bodies, it engages with the backlash prevention projection. A joint for a half-split pipe is provided in which each insertion hole is provided with a locking protrusion that prevents a connecting member from moving backwards.

The present invention also provides the above-mentioned joint in which a circumferential sealing material application groove is formed in each of the joint bodies, and the space between the groove and the outer periphery of the half pipe is filled with the sealing material.

〔Example〕

In the embodiment shown in FIGS. 1 to 5, 1
1 and 12 are semicircular joint bodies made of elastic synthetic resin such as polyethylene, and 13 is a plate-shaped connecting member made of the same material.

Projection 14 on the outside of one side edge of one joint body 11
There is an inward dovetail-like engagement groove 15 over the entire length on the inside of the
A protrusion 16 that engages with the engagement groove 15 is formed on the outside of one side edge of the other joint body 12, and protrusions 17 are formed on the outside of both ends thereof.

Also, on the outside of the other side edge of one joint body 11,
A projecting edge 18 is integrally formed over the entire length, and a projecting edge 19 that contacts the projecting edge 18 is integrally formed on the outside of the other side edge of the other joint body 12.

Insertion holes 21 and 22 for the connecting member 13 are formed in the projecting edges 18 and 19.

A wide head 23 is integrally formed on the connecting member 13, and as shown in FIG. Multiple and small retrograde prevention protrusions 2
Provide a plurality of 6.

A locking protrusion 27 for locking the anti-reverse protrusion 24 is provided in the insertion hole 22, and a latch protrusion 28 for locking the anti-reverse protrusion 25, 26 is also provided in the insertion hole 21.

Further, the entrance side of the insertion hole 21 is tapered so that the connection member 13 can be easily inserted.

A pair of left and right protrusions 31 and 32 are provided inside the joint bodies 11 and 12, respectively, and grooves 33 and 34 for applying sealant are formed between them.

Further, a leak-preventing tongue piece 35 of a sealing material is integrally formed at the end of the main body 11 on the side where the insertion hole 21 is formed, and the tongue piece 35 is integrally formed at the end of the main body 12 over almost the entire length.
5 is provided with a recess 36 into which the main body 11, 12 is inserted, and a pair of anti-rolling pieces 37, 38 are integrally provided on the outside of each main body 11, 12.

Below, the order of connecting half pipes using the joint of the above embodiment will be explained.

A half pipe 40 of a certain length located at the bottom of the power cable 2 is placed in the recess of the stand 41 as shown in FIG.
Place the upper half tube 40 on top of it, but at that time,
A packing 42 made of sponge rubber or the like is interposed between the ends of the upper and lower half tubes 40 by adhesive or other means.

Next, a stainless steel band 43 is wrapped around the outer periphery of the upper and lower half tubes 40, which have become cylindrical, and the both ends are connected and tightened by an appropriate means, thereby joining the upper and lower half tubes 40 together and forming a pipe. do.

Adjacent parts of the pipe consisting of the half pipes 40 joined as described above are covered with packing tape 44 on the outer periphery.
Wrap around.

On the other hand, the connecting member 13 is pushed into the insertion hole 22 of the joint body 12, and the head 2 is inserted as shown in FIG.
3 hits the end surface of the protruding edge 19, and the reverse movement prevention protrusion 24 is kept in a state of being locked with the locking protrusion 27 in the insertion hole 22.

After applying a sufficient amount of paste sealing material to the grooves 33 and 34 in both main bodies 11 and 12,
The part wrapped with packing tape 44 is sandwiched between the two main bodies 11 and 12, the protrusion 16 of the main body 12 is engaged with the engagement groove 15 of the main body 11, and the connecting member 13 fixed to the main body 12 is pushed into the insertion hole 21. .

At this time, the reverse movement prevention protrusions 26 and 25 of the member 13
press the locking protrusion 28 in the insertion hole 21 to release the protrusion 18
The robot moves forward while elastically deforming the outer part of the robot.

At first, the joining member 13 can be pushed in manually, but at the final stage, it becomes difficult to push it in.

At this time, when both ends of the projecting edges 18 and 19 are pinched and pressed with a bench or the like, the member 13 is completely pushed into the connected state shown in FIG. 5, and cannot be easily removed.

FIG. 2 shows a state in which the joint bodies 11 and 12 are completely connected, and at this time, sealing material is filled between the grooves 33 and 34 in the bodies 11 and 12 and the outer circumference of the half pipe 40. , is omitted in the figure.

In the above process, connect the outside of each cable 2 to the half pipe 4.
After enclosing the area with 0, harden it with concrete and backfill.

[Effect of idea]

As mentioned above, this idea consists of a pair of left and right semicircular joint bodies, in which the engagement groove and protrusion on one side edge of each body are engaged with each other, and the connecting member inserted into the insertion hole of one of the bodies. The fitting can be set by simply pushing it into the insertion hole of the other body, and no special tools are required, making it easy and efficient to work in narrow spaces such as in trenches dug from the ground. This improves workability.

In addition, the tightening force is large, and watertightness is significantly improved by sufficiently applying the sealant to the sealant application groove in the joint body.

[Brief explanation of drawings]

Fig. 1 is a front view of one embodiment of the connected state of this devised joint, Fig. 2 is an enlarged vertical sectional side view along the line shown in Fig. 1, Fig. 3 is an enlarged perspective view of the joint, and Fig. 4 is a joint and a half. FIG. 5 is an enlarged longitudinal sectional side view of the joint between the joint body and the connecting member; FIG. 6 is a partially cutaway vertical sectional view showing an example of an underground pipeline; FIG.
The figure is an enlarged cross-sectional view taken along the lines of FIG. 2... Power cable, 11, 12... Joint body, 13... Connection member, 15... Engagement groove, 16...
...Engagement protrusion, 18, 19...Protrusion, 21, 22...
...Insertion hole, 23...Wide head, 24, 25, 26
... Reverse movement prevention projection, 27, 28 ... Projection, 31,
32... protrusion, 33, 34... groove for sealing material application, 40... half pipe.

Claims (1)

[Claims for Utility Model Registration] (1) Consisting of a pair of left and right semicircular joint bodies and a plate-shaped connecting member that connects each joint body. An engaging groove extending across the joint body and a protrusion that engages with the engaging groove are provided, and an insertion hole into which the connecting member is inserted is formed in the protruding edge provided on the outside of the other side edge of both joint bodies. , a wide head is provided at one end of the connecting member, and a reverse prevention protrusion is provided on the side surface of the connecting member, and when the connecting member is inserted into the insertion hole of both joint bodies, it engages with the reverse prevention protrusion and connects. A joint for half-split pipes with a locking protrusion in each insertion hole to prevent the member from moving backwards. (2) A joint for a half pipe according to claim 1, wherein a circumferential sealing material application groove is formed in each of the joint bodies, and a space between the groove and the outer periphery of the half pipe is filled with the sealing material.