Flexible waterproof sealing structure for underground direct-buried cable or optical cable through-wall and construction method

Abstract

The invention provides a flexible sealing structure for underground direct-buried cable or optical cable through-wall and a construction method. The structure comprises a through-wall protection tubeand a flexible sealing assembly arranged between the through-wall protection tube and a cable or an optical cable. The flexible sealing assembly is at least arranged on the upstream face side of the through-wall protection pipe. The flexible sealing assembly comprises a long pipe hoop, a flexible sealing piece located in the long pipe hoop and an end locking gland installed at the end of the longpipe hoop, a flexible sealing piece is arranged between a threaded adjusting check ring arranged in the long pipe hoop and the end locking gland, and the flexible sealing piece and the sealing faces of the through-wall protection pipe and the cable or the optical cable form static sealing. According to the invention, the flexible sealing assembly with a pre-pressing and pre-tightening adjusting mechanism is adopted between the cable or the optical cable and the through-wall protection tube; the functions of radial two-way positioning and axial side two-way positioning are achieved, a sealing ring set in the sealing cavity is made to be in three-way extrusion stress, a static sealing zero space between the through-wall protection pipe and the cable or the optical cable is formed, and therefore, the waterproof sealing effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering in industrial buildings, civil buildings, and municipal buildings, and relates to a waterproof sealing technology for underground direct-buried cables and optical cables passing through walls of outer protective structures, in particular to an underground direct-buried cable or optical cable passing through walls Use flexible waterproof sealing structure and construction method. Background technique [0002] At present, in the electrical engineering of industrial buildings, civil buildings, and municipal engineering, when cables and optical cables are buried underground and pass through the walls of external protective structures such as buildings and structures, they usually use Figure 1A to Figure 1D The waterproof and sealing structure shown is used to achieve the waterproof and sealing effect (see the national standard design and construction atlas "110kv and below cable laying"...

AI Technical Summary

Problems solved by technology

[0009] 1) General metal wall-through protection pipe 2 and concrete are two different materials, and the physical expansion coefficients between them are different, which will inevitably cause expansion and leakage gaps between mutual contacts; although the waterproof sealing effect of the water-stop plate is higher than that of the implementation Method 1, but it is difficult to guarantee the waterproof and sealing function under the condition of high groundwater level and high osmotic pressure only by a single wing ring plate 021;

[0010] 2) The extended wall-penetrating protection pipe 2 is pre-buried in the wall body 01 to form a cantilever-type force-bearing structure, so that the wall body 01 bears a large torsion while bearing force in both directions. For the construction process of the wall body 01 Positioning, support, wall structure reinforcement, formwork support, concrete pouring and post-maintenance will all cause great difficulty and increase construction costs

Although the improved sealing structure can form extrusion force in the axial direction to ensure the sealing between the two flanges, but the sealing material is not in the closed cavity, it cannot form radial extrusion stress, and the outer flange There is a distance between 022 and the nozzle of the wall casing 2, and the position of the second leakage channel LC2 is moved backward by a distance of a flange. Even if the oil-soaked hemp rope 023 expands when it meets water, it still cannot form a sealed space (there is an open space in the vertical direction) ), the waterproof sealing effect of this structure is easy to fail

In addition, in this structure, the oil-soaked hemp rope 023 is wrapped around the outside of the cable or optical cable 1, the winding form is not fixed, and the number of windings is difficult to quantify, which is not conducive to the realization of standardization

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