JPS5821311Y2 - Waterproof device for cable conduit entrance - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a waterproofing device for a cable conduit entrance used in a conduit entrance such as an entrance hole, an underground hole, a tunnel, a bit, or a penetrating part of a building.

Conventionally, when three cables are passed through a conduit, it is difficult to waterproof the central part between the cables, and installation is time consuming and inconvenient if a device with a complicated structure is used.

Further, even when a waterproof device is used, the waterproof effect between the outer periphery of the waterproof device and the conduit and between the waterproof device and the cable is insufficient.

The inventor of this invention developed a cable conduit mouth waterproofing device in 1986-3.
Although it was proposed in Japanese Patent No. 8894, the present invention is an improvement of the seal rubber of the earlier application in order to improve the durability and water-stopping effect.

This invention solves the above-mentioned problems by improving the water-stopping effect at the center of multiple cables, between the seal rubber and the conduit, and between the seal rubber, the cable, and the oven, and improving the durability of the seal rubber. With the goal.

This invention will be explained with reference to embodiments in the accompanying drawings.

As shown in FIGS. 1 and 2, the seal rubber 1 is made of rubber, has a fan-shaped cross section, and has semicircular holes 2 in the axial direction on both side walls, and a hole for a bolt in the axial direction between the holes 20. 3, a plurality of circumferential ribs 4 are formed on the outer periphery, and a plurality of circumferential ribs 5 are also formed on the inner periphery of the hole 2.

As shown in Figs. 3 and 4, the two flanges 6゜7 have the same shape as the seal rubber 1, the outer circumference is smaller than the outer circumference diameter of the seal rubber 1, and the semicircular hole 8 is connected to the hole 2 of the seal rubber. It is made to cover the thin arcuate tongue portion 9 to be connected.

As shown in FIGS. 5 and 6, bolts 10 are attached to the rear flange 6.
The tip of the bolt 10 is welded 11, and the bolt 10 is passed through the hole 3 of the seal rubber 1, and a nut 12 is screwed onto the base of the bolt 10.

Three cables 14 are inserted into the conduit 13, the seal rubber 1 assembled as described above is inserted, the cables 14 are respectively arranged in the holes 2, and the nuts 12 are tightened.

As a result, the seal rubber 1 contracts in the axial direction, and conversely, the outer periphery of the seal rubber 1 expands, the rib 4 comes into close contact with the inner periphery of the conduit 13, and the diameter of the ridge 5 of the hole 2 contracts, causing the cable 14 to The three cables 14 are brought into close contact with each other, and the center portions 15 of the seal rubber 1 gather to fill the center gap between the three cables 14.

Therefore, the contact portion between the outer periphery of the seal rubber 1 and the conduit 13, the contact portion between the hole 2 of the seal rubber 1 and the cable 14, and the center portion 15 of the seal rubber 1 are in close contact with each other to provide waterproofing.

Note that if the valleys between the plurality of ribs 4 and the valleys between the plurality of ribs 5 are filled with water-absorbing and swelling resin paint, the water-stopping effect will be enhanced.

Since this invention has the above-mentioned configuration, the water-stopping effect at the center of the three cables is perfect.

That is, the center portion 15 of the seal rubber 1 can respond to deformation of the cable, such as physical changes due to earthquakes or movement during construction, and can stop water.

Further, since there are ribs 4 on the outer periphery of the seal rubber 1 and ribs 5 on the inner periphery, even if the nut 12 is slightly tightened, the ribs 4 contact the conduit 13 and the ribs 5 contact the cable 14 to reach a water stop pressure.

Therefore, durability is improved because no excessive force is applied to the seal rubber.

Furthermore, even if permanent compression deformation occurs in the seal rubber 1, gaps are less likely to form due to the effect of the ribs.

Furthermore, it has a simple structure and can be installed by simply tightening a nut, making it extremely easy to work with.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of the seal rubber, Fig. 2 is a front view thereof, Fig. 3 is a side view of the flange, Fig. 4 is a front view thereof, and Fig. 5 is a side view of the seal rubber. FIG. 6 is a side view showing the state of use of the present invention, and FIG. 6 is a sectional view taken along the line Vl--Vl in FIG. 5. 1... Seal rubber, 2... Hole, 3...
・・・・Power running 4.5・・・・Rib, 6・・・・
...Rear flange, T...Front flange, 8...
... Hole, 9... Arc-shaped tongue, 10...
Bolt, 12...nut, 13...i tube, 14...cable.

Claims (1)

[Scope of utility model registration request] A rubber cylinder is radially divided into three parts, and a semicircular hole 2 is formed in the axial direction on the side wall of the divided parts to form a seal rubber 1, and a circumferential hole is formed on the outer periphery of the seal rubber 1 and the inner periphery of the hole 2. A plurality of ribs 4 and 5 each having a semicircular cross section are provided protruding from each other, and both ends of the seal rubber 1 in the axial direction are connected to a sector-shaped rear flange 6.
, which are clamped by the front flange 1 and integrated by bolts and nuts, is a waterproofing device for a cable conduit opening made by combining three of these single units.