WO2021031329A1

WO2021031329A1 - Composite fire-resistant cable

Info

Publication number: WO2021031329A1
Application number: PCT/CN2019/112722
Authority: WO
Inventors: 雷欢; 庞锐剑; 邹易清; 韦耀淋; 黄芳玮; 谢正元; 朱永权; 覃磊; 李华萍; 黎睦汉; 张峰; 苏琦; 蒋立军; 罗艳葵
Original assignee: 柳州欧维姆机械股份有限公司
Priority date: 2019-08-19
Filing date: 2019-10-23
Publication date: 2021-02-25
Also published as: CN211312201U

Abstract

The present utility model relates to the field of anchoring structural components, and in particular relates to a composite fire-resistant cable. The composite fire-resistant cable comprises a cable body, and further comprises a first fire-resistant layer wrapped on an outer surface of the cable body, and a sleeve disposed around the outside of the first fire-resistant layer, wherein a gap is provided between an inner surface of the sleeve and an outer surface of the first fire-resistant layer. A second fire-resistant layer is wrapped on an outer surface of the sleeve. The cable of the present utility model has a two-layer protection system serving fire-resistance and thermal insulation functions, and a thermal insulation technique of fireproofing cladding is used in between the two fire-resistant layers, thus significantly improving the high temperature resistance, and extending the fire resistance time of the cable.

Description

Composite fireproof cable

Technical field

The utility model relates to the field of anchoring structural members, in particular to a composite fireproof cable.

Background technique

Cables are widely used in bridges, construction venues and other fields. With the increase of chemical transportation and incidental factors, the potential risk of cable fires continues to increase. Studies have shown that when the steel structure is at 600℃, its mechanical properties will be reduced by 2/3, while the general fire temperature reaches above 800℃. As the main stress-bearing part of the bridge, the cable will have a serious impact on the cable once a fire occurs. Therefore, the fire safety protection of the cable is of great significance. At present, many projects have put forward the demand for the cable to have fire protection function.

However, the surface material of the conventional cable is generally ordinary HDPE or steel, which does not have the function of fire and heat insulation; some cables with the function of fire and heat insulation also have some obvious shortcomings: such as a fireproof cable disclosed in Chinese patent CN207259963U A layer of fireproof structure is added to the cable, so that the cable has the function of fire and heat insulation. A single fire protection structure and a single fire protection measure have limited fire and heat insulation capabilities.

Another example is a flame-retardant cable disclosed in Chinese Patent CN109457612A. The surface of the cable is respectively coated with an insulating layer and flame-retardant rubber, thereby improving the flame-retardant performance of the cable. Single fire protection measures, such as the coating method, have limited fire and heat insulation capabilities, and the flame retardant rubber has low fire resistance and high economic costs.

In addition, there are cables with double-layer fireproof structures in the prior art. For example, a long-lasting building cable disclosed in Chinese Patent CN101775781A includes a cable body and an additional protective layer on the outside of the cable body; the additional protective layer includes wrapped in the cable External fireproof cloth, steel casing, fireproof coating or including steel casing sheathed outside the cable body, mortar layer poured between the steel casing and the outer surface of the cable body, and fireproof coating coated on the outside of the steel casing. The additional protective layer includes a fireproof cloth wrapped around the cable body, a steel sleeve wrapped around the fireproof cloth, and a fireproof coating coated on the outer surface of the steel sleeve. Although the structure has a double-layer fireproof structure, it solves the problem of single cable fireproof structure and poor fire resistance and heat resistance, but there will still be rapid heat transfer between the two layers of fireproof materials, and there is no air convection for heat dissipation. The time is still short.

Utility model content

The utility model provides a composite fireproof cable, which adopts a two-layer composite fireproof structure, so that the cable has a double-layer fireproof and thermal insulation protection system, and at the same time, a shielding method is adopted between the two fireproof layers to make The high temperature resistance and fire resistance time of the cable have been greatly improved.

The technical scheme of the utility model is as follows:

A composite fireproof stay cable includes a cable body, a first fireproof layer covering the outer surface of the cable, and a sleeve arranged outside the first fireproof layer. The sleeve passes through and The upper and lower structures of the cable body are lapped or welded for positioning and fixing, a gap is provided between the inner surface of the sleeve and the outer surface of the first fireproof layer, and the outer surface of the sleeve is covered with The second fire protection layer. Adopt a two-layer composite fireproof structure, namely the first fireproof layer and the second fireproof layer, so that the cable has a double-layer fireproof and thermal insulation protection system;

A gap is provided between the inner surface of the sleeve and the outer surface of the first fireproof layer, and an isolated space is formed between the first fireproof layer and the second fireproof layer to prevent the heat of the first fireproof layer from being directly transferred to The second fire protection layer; because the air heat transfer speed is very slow, thereby avoiding the rapid heat conduction of heat, greatly slowing down the heat transfer speed of the outer fire protection structure to the inner fire protection structure, while the casing and the cable body The internal gap is connected with the external air, which can form air thermal convection to dissipate the heat in the gap through the air flow to take out the cable, and realize the insulation method between the two fire protection layers using the shielding method, so that the cable has high temperature resistance performance and The fire resistance time has been greatly improved.

Preferably, the sleeve is structured as a structure formed by connecting two semicircular tubes, and the sleeve is a split-half structure, that is, a Haval structure. The structure can be performed independently without affecting the normal use of the cable. Installation and replacement of the cable fireproof structure, when replacing or adding the fireproof structure, only the casing pipe needs to be removed, and the cable does not need to be replaced, and the normal operation of the cable is not affected.

Preferably, the sleeve is one of steel pipe, HDPE pipe or plastic pipe, with simple structure and low cost.

Preferably, the structure of the first fireproof layer is one of a wrapped fireproof layer or a sprayed fireproof layer, and is fixedly arranged on the outer surface of the cable body, with a simple structure, low manufacturing cost, and convenient construction.

Preferably, the structure of the second fireproof layer is one of a wrapped fireproof layer or a sprayed fireproof layer, and is fixedly arranged on the outer surface of the casing, with a simple structure, low manufacturing cost and convenient construction.

The beneficial effects of the utility model are:

1. The shielding method is adopted between the two fireproof layers, which greatly slows down the heat transfer speed of the outer fireproof structure to the inner fireproof structure, and greatly improves the high temperature resistance and fire resistance time of the cable.

2. The use of a two-layer composite fire protection structure makes the cable have a double-layer fire and heat insulation protection system; it effectively guarantees the safety of the cable in the use of fire accidents, and meets the requirements of different countries and regions due to traffic congestion. Fire performance requirements. The composite structure can also be applied to the cables of old bridges to increase the fire protection function and improve the safety of use.

The utility model is a fireproof structure that integrates the advantages of three fireproof methods: spraying method, encapsulation method and shielding method. It realizes the fireproof ability of the cable for a long time. The composite fireproof structure is simple, convenient for construction and low production cost. The economy is good.

Description of the drawings

Figure 1 is a schematic diagram of the structure of embodiment 1 and embodiment 3 and embodiment 4 of the present invention.

Fig. 2 is a schematic structural diagram of Embodiment 2 of the present invention.

In the picture: 1-cable body, 2-first fire protection layer, 3-casing tube, 301-first semicircular tube, 302-second semicircular tube, 4-second fire protection layer.

detailed description

Example 1:

A composite fireproof stay cable, comprising a cable body 1, further comprising a first fireproof layer 2 which is arranged on the outer surface of the cable body 1, and a sleeve 3 arranged outside the first fireproof layer 2. A gap is provided between the inner surface of the sleeve 3 and the outer surface of the first fireproof layer 2, and the outer surface of the sleeve 3 is covered with a second fireproof layer 4.

The installation method and working principle of this embodiment are as follows:

Firstly set the first fireproof layer 2 on the surface of the cable body 1, then set the sleeve 3 outside the first fireproof layer 2, and finally set the second fireproof layer 4 on the outer surface of the sleeve 3 . Both the first fireproof layer 2 and the second fireproof layer 4 can be made by spraying for encapsulation, and after the structure is formed, there is a certain gap between the inner and outer fireproof layers, and the gap passes through the sleeve 3 The two ends of the cable are connected with the outside air to form a shielding method of heat insulation between the two fireproof layers. The composite structure makes the inner and outer fireproof materials form air heat convection, which makes the cable high temperature resistance and fire resistance time Get a great improvement.

Example 2:

A composite fireproof stay cable, comprising a cable body 1, further comprising a first fireproof layer 2 covering the outer surface of the cable body 1, a sleeve 3 arranged outside the first fireproof layer 2, and The sleeve 3 is provided with a gap between the inner surface of the sleeve 3 and the outer surface of the first fireproof layer 2, and the outer surface of the sleeve 3 is covered with a second fireproof layer 4.

The casing 3 is positioned and fixed by overlapping or welding with the upper and lower structures of the cable body 1. The upper and lower structures can be fixed parts of the ends of the bridge, embedded pipes or waterproof covers, etc. Fix the installation position. After the installation of the casing 3 is completed, the casing 3 and the cable body 1 are relatively fixed, and the top and bottom positions of the casing 3 can be connected to the outside air. , Affected by the temperature difference, the internal air will undergo convective movement to facilitate heat dissipation.

The sleeve 3 is configured as a structure formed by connecting two semicircular tubes, including a first semicircular tube 301 and a second semicircular tube 302, and the sleeve 3 is a split structure, that is, a Haval structure;

The casing 3 is a steel pipe;

The first fireproof layer 2 is configured as a wrapped fireproof layer, and the first fireproof layer 2 is wrapped on the cable body 1 with a fireproof material.

The second fireproof layer 4 is configured as a wrapped fireproof layer, and the second fireproof layer 4 is wrapped on the sleeve 3 with a fireproof material.

The installation and working principle of this embodiment are as follows:

Firstly, install fireproof materials on the surface of the cable body 1 by wrapping installation to form the first fireproof layer 2, and then set the sleeve 3 outside the first fireproof layer 2, and the top and bottom of the sleeve 3 are both It is installed on the waterproof cover of the bridge by overlapping, and finally fireproof material is arranged on the outer surface of the casing 3 in a wrapping installation manner to form the second fireproof layer 4. After the installation is completed, there is a certain gap between the first fireproof layer 2 and the second fireproof layer 4, thereby forming a shielding method of heat insulation between the two fireproof layers.

Example 3:

The difference between this embodiment and the above-mentioned embodiment 2 is that the sleeve 3 is a round tube, and the sleeve 3 is an HDPE tube, that is, the sleeve 3 is made of high-density polyethylene.

The first fireproof layer 2 is configured as a sprayed fireproof layer, and the first fireproof layer 2 is arranged on the cable body 1 by spraying a fireproof material.

The second fireproof layer 4 is configured as a sprayed fireproof layer, and the second fireproof layer 4 is arranged on the sleeve 3 by spraying a fireproof material.

The top and bottom of the casing 3 are both set on the embedded pipe of the bridge by welding.

Example 4:

The difference between this embodiment and the foregoing embodiment 3 is only that the sleeve 3 is a plastic tube.

Claims

A composite fireproof cable, comprising a cable body (1), characterized in that it also includes a first fireproof layer (2) covering the outer surface of the cable body (1), which is arranged on the first fireproof layer Layer (2) outer casing (3), a gap is provided between the inner surface of the casing (3) and the outer surface of the first fireproof layer (2), and the outer surface of the casing (3) The surface is covered with a second fireproof layer (4).
The composite fireproof cable according to claim 1, wherein the sleeve (3) is constructed as a structure formed by connecting two semicircular pipes.
The composite fireproof stay cable according to claim 1 or 2, characterized in that the casing (3) is one of steel pipe, HDPE pipe or plastic pipe.
The composite fireproof cable according to claim 1 or 2, characterized in that: the first fireproof layer (2) is constructed as one of wrapped fireproof layer or sprayed fireproof layer, and is fixedly arranged on the The outer surface of the cable body (1).
The composite fireproof cable according to claim 1 or 2, characterized in that: the second fireproof layer (4) is constructed as one of wrapped fireproof layer or sprayed fireproof layer, and is fixedly arranged on the The outer surface of the cable body (1).