First, expansion water-resisting sand belt enhances moisture-proof performance.
On the basis of maintaining the existing structure of the direct burial fiber cable junction box, the moisture-proof performance of the junction box can be improved by replacing the non-vulcanized rubber band with the expanded water-resisting sand band. The water-resisting function of the expansive water-resisting sand belt is to use the main body of the water-resisting sand belt to expand rapidly to form a large volume of colloidal material after it meets water.
The gelatin has large water absorption capacity and strong water retention capacity. It can effectively block the growth of water for a long time, block the water channel space between the direct burial fiber cable
junction box and the outside, and prevent the water from continuing to infiltrate and diffuse. Compared with non-vulcanized rubber belt, water-blocking sand belt has the following characteristics: reusable, reducing the operation and maintenance cost of optical cable.
Second, improvement of hot-cable casing structure.
The sealing process of optical cable entering joint box is different, and the sealing performance of different structure joint box is different, which brings different moisture-proof effect. The cap joint box is used for waterproofing by thermoplastic sleeve in the cable leading part of the joint box., and non-hexafluoride rubber belt is moisture-proof in this part of the open type and other commonly used direct burial fiber cable connector box. From the overall effect, it is obvious that the anti-moisture effect of hot cable casing is better than that of non-vulcanized rubber belt. Therefore, the shrinkable sleeve used for cap joint box sealing should be used for other types of direct burial fiber cable joint box. The structure of the improved joint box is unchanged. It only extends the length of the clamp of the original connector box into the optical cable
, and is connected with the upper and lower cover. Thus, the moisture-proof performance of the direct burial fiber cable joint box can be further improved.