JPH04203690A - branch pipe fittings - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a branch pipe joint used for the purpose of forming branch piping for branching cables from various cable installation main pipes, and in particular, relates to a branch pipe joint made of synthetic resin. This relates to branch pipe joints made of aluminum or metal.

[Prior Art] When forming a branch pipe from a main pipe into which a communication cable or the like is inserted, piping as shown in FIG. 6 is performed. For example, a branch pipe joint 2 is joined to an arbitrary position of a main pipe M buried underground, a branch pipe is connected via the branch pipe joint 2, and the branch pipe is guided to a building B or the like. FIG. 4 is a perspective explanatory view showing an example of the branch pipe joint 2, in which the branch pipe joint 2 has a saddle portion 21 joined to the outer periphery of the main pipe 1 with an adhesive or the like.
and a branch pipe section 22 for connecting branch piping are integrally formed. In joining this branch pipe joint 2 to the main pipe 1, first, a through hole IA of a predetermined size is bored in the wall of the main pipe 1, and the area around the through hole IA and/or the saddle portion 21 is Adhesive is applied to the inner surface, the through hole IA and the lower opening of the branch pipe section 22 are aligned, and the saddle section 21 is placed over the adhesive application section 12, as shown in Fig. 5 (cross-sectional view).
The inner surface of the saddle portion 21 is fastened and fixed to the outer periphery of the main pipe 1 using a band member 9.9 shown in FIG. Reference numeral 23 designates a plurality of protrusions for positioning into the through hole IA, and a plurality of protrusions are provided to protrude from the inner surface of the saddle portion.

[Problems to be Solved by the Invention] By the way, the saddle portion 21 of the branch pipe joint 2 is of a mallet shape, as if the pipe was divided in half in the axial longitudinal direction and one half of the pipe was used. As shown, it has a half-split shape cut along a plane passing through the axis 0, and the central angle α of the lower opening (hereinafter simply referred to as the opening angle) is approximately 180 degrees. Therefore, when this is placed over the outer periphery of the woodwind 1, the band member 9.
9, unless a means of fastening and fixing it to the main pipe 1 is adopted.
It comes off easily from main pipe 1. For this reason, when installing the branch pipe joint 2, the soil should be removed so that the main pipe 1 is completely exposed, and the band member 9.
9 has to be done manually and requires a lot of effort, which is disadvantageous in that it takes a long time to work inside the excavated hole.

On the other hand, in order to position the branch pipe part 22 at the correct position of the through hole IA, a protrusion 23.23 is glued to the inner surface of the saddle part 21, but since this protrusion 23 is dot-shaped,
Even if the through hole IA does not have a predetermined shape, it may fit in, and the lower opening of the branch pipe portion 22 and the through hole IA may not match accurately.

On the other hand, since the saddle 1is21 is placed on the main pipe 1, the peripheral corner part 11 of the through hole IA remains exposed inside the wood pipe 1, and the branch pipe part 2 as shown in FIG.
When the cable W is inserted into the cable 2, the cable W is rubbed against the peripheral corner 11, which may damage the outer surface of the cable or the cable itself. Therefore, in order to prevent such inconvenience from occurring, it is necessary to perform chamfering as shown by the broken line 11a, which requires time and effort.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a branch pipe joint that can be firmly attached to a wood pipe with simple work without the risk of damaging cables etc. inserted therein.

[Means for Solving the Problems] The present invention has achieved the above objects by forming a protrusion along the circumferential surface of the through hole on the inner surface of the top of the saddle part, and by adjusting the protrusion height of the protrusion to a normal value. The gist is that the saddle is formed to have a thickness greater than the wall thickness of the tube, and the center angle of the opening of the saddle portion is formed in the range of 80 to 140 degrees.

C Effect] In the branch pipe joint of the present invention, a protrusion along the through-hole of the main pipe is formed on the inner surface of the top of the saddle part, so the through-hole is bored in a predetermined shape so as to fit the protrusion. The lower opening of the branch pipe portion and the through hole must be accurately positioned and communicated with each other.

In addition, since the tip of the protrusion is formed with a curved surface and has a protrusion height that is greater than the main pipe wall thickness, the cable inserted from the main pipe to the branch pipe side will not be damaged. There is no need to chamfer the peripheral corner of the through hole.

Furthermore, by setting the opening angle of the saddle in the range of 80 to 140 degrees, the main pipe can be coated by temporary pressure, and the woodwind can be wrapped by the gripping force of the lower end portions on both sides of the saddle. It is no longer necessary to fasten and fix with band members, etc., and the work in the excavated hole is minimized and construction can be performed easily.

[Embodiment] Fig. 1 is a cross-sectional explanatory diagram showing a typical embodiment of the present invention, Fig. 2 is a side view seen from the right direction in Fig. 1, and Fig. 3 is a side view as seen from the right direction in Fig. 1.
The figure is a sectional view taken along the line III-IH in FIG. 1. The branch pipe joint 2 has a saddle part 21 and a branch pipe part 22 integrally formed, and a protrusion part 26 is provided on the inner surface of the top of the saddle part 21 at the base of the branch pipe part 22 . On the section side, the root part of the branch pipe part 22 is depressed inside the saddle part 21 to form the protrusion part 26, and the protrusion part 26 is connected to the pipe axis from one end in the pipe axis direction (the part indicated by reference numeral 26a). It is provided in a U-shape in the longitudinal direction (the part indicated by reference numeral 26b). The protruding portion 26 may be integrally formed as a thick inner portion during molding, or may be a separately molded member bonded to the inner surface of the saddle portion 21. Further, the range in which the protruding portion 26 is formed is arranged at least in a portion (a portion indicated by reference numeral 26a) where the cable contacts at one end in the tube axis direction,
Other portions around the through hole IA may be provided arbitrarily, and may extend over the entire circumference of the through hole. Furthermore, the arrangement shape of the protrusion 26 may be arbitrarily changed according to the size and shape of the through hole IA bored in the main pipe 1.

On the other hand, the tips of the protrusions 26 (26a, 26b) are formed with smooth curved surfaces, and the protrusion height is greater than the wall thickness of the main pipe 1, so that the protrusions are the same as or higher than the inner surface of the main pipe 1. It is configured to appear. As a result, when the cable W is inserted into the branch pipe section 22 side as shown in FIG. It turns out.

Preferably, as shown in FIG. 1, it is recommended that the upper surface portion 22a on the root side of the branch pipe portion 22 be formed with a gently curved surface, so that an optical fiber cable or the like having a limited bending angle can be smoothly curved. It is then introduced into the branch pipe section 22.

By the way, as shown in FIG. 2, the saddle part 21 has an axis 0.
An opening 21A having an opening angle α centered at Constructed to exert appropriate gripping force. That is, by forming the above-mentioned opening angle α to be smaller than 140 degrees, when the outer peripheral surface of the woodwind 1 is covered with the saddle part 21, the lower edge of the saddle part 21 wraps around the woodwind 1, and the main pipe 1 This results in a strong gripping force. If the -opening angle α exceeds 140 degrees, the gripping force by the lower edge of the saddle becomes weak and the saddle does not come into close contact with the outer periphery of the main tube 1. The gripping force increases as the opening angle α becomes smaller, but if the opening angle α becomes too small, as shown in FIG. When covering the main pipe 1, it is necessary to increase the pressing force F, which makes the work difficult and
Accidents such as damage to the saddle portion 21 may also occur due to the forced expansion of 1A.

For example, a vinyl chloride resin saddle 21 with an inner diameter of 150 mm, a thickness of 5.5 mm, and a length of 375 mm has an outer diameter of 1
When fitting into the 50 mm main pipe 1, the opening angle α is set to 140°, 120°, 110°, 100°, and 8, respectively.
When using the one set at 0°, the respective insertion pressing force was 9.
6゜17.0.21.6,26.2,35.5 (kg
), and if it is smaller than 80”, it will exceed 35 kg,
It turned out that the covering work would be difficult.

On the other hand, after applying adhesive to the outer periphery of the main pipe 1 and the inner surface of the saddle part 21, and inserting the saddle part, 0.4 kg/g was applied for 2 minutes.
When bonding was carried out under a pressure of cm2 and the adhesive airtightness was evaluated, it was found that when the opening angle α exceeds 140 degrees, the gripping force of the saddle portion 21 becomes weaker and the adhesiveness deteriorates. .

A more preferable range of the opening angle α is 100 to 120
It has been found through the above experiments that the temperature is within the range of

In the above example, the main pipe 1 is only a single pipe type with a circular cross section, but the branch pipe joint of the present invention can be used for multiple pipes such as a two pipe pipe or a four pipe pipe with an oval or rectangular cross section. It can also be applied to pipes.

[Effect of the invention] Since the present invention is configured as described above, claim (1)
This makes it possible to accurately position the branch pipe section in the through hole formed in the main pipe. Further, there is no longer any damage to the various cables that are inserted through the hole, and there is no need to chamfer the periphery of the through hole.

In addition, according to claim (2), the main pipe can be easily covered without going into an excavated hole, and since the main pipe can be enclosed by the gripping force of the joint itself, fastening and fixing with a band member etc. is also possible. No longer needed.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory diagram showing a typical embodiment of the present invention, FIG. 2 is a side view as seen from the right arrow in FIG. 1, and FIG. 3 is an I
4 is a perspective explanatory view showing an example of a conventional branch pipe joint, Fig. 5 is a cross-sectional view showing the usage state of Fig. 4, and Fig. 6 is a cross-sectional view of a branch pipe joint. It is an explanatory view showing an example of arrangement. 1... Main pipe IA... Through hole 2... Branch pipe joint 21... Saddle part 22... Branch pipe part 30... Connection pipe M... Main pipe D
...Branch pipe B...Building GL...Ground surface Applicant Ribota Co., Ltd. Applicant Nippon Telegraph and Telephone Corporation Figure 3 F

Claims (2)

[Claims] (1) In a branch pipe joint in which a saddle part and a branch pipe part are integrally formed, the saddle part surrounds a through hole drilled on the outer periphery of the main pipe, and the branch pipe part communicates with the through hole. A branch pipe joint, characterized in that a protrusion along the circumferential surface of the through hole is formed on the inner surface of the top of the saddle part, and the protrusion height of the protrusion is greater than the wall thickness of the main pipe. . (2) The center angle of the opening in the saddle part is 80~1
The branch pipe joint according to claim 1, wherein the branch pipe joint is formed in a range of 40 degrees.