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A heat-insulated and fire-resistant graded protection structure for bridge stay cables and its construction method

A protective structure and construction method technology, applied in the direction of bridges, cable-stayed bridges, bridge materials, etc., can solve the problems of waste of fire-resistant materials, single protection method, increased management and maintenance costs, etc., to achieve guaranteed utilization, excellent anti-corrosion performance, The effect of reducing the amount of material used

Active Publication Date: 2021-06-29
广州珠江黄埔大桥建设有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes the application of relatively expensive refractory materials wasteful, and the cost of management and maintenance is greatly increased
At the same time, as mentioned above, the current consistent protection of stay cables does not consider the impact of fires in different models, and the protection method is single and general

Method used

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  • A heat-insulated and fire-resistant graded protection structure for bridge stay cables and its construction method
  • A heat-insulated and fire-resistant graded protection structure for bridge stay cables and its construction method
  • A heat-insulated and fire-resistant graded protection structure for bridge stay cables and its construction method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In the cable-stayed bridge in this embodiment, the cable-stay cables are standard hot-extruded polyethylene high-strength steel wire cable structures, and the galvanized steel wire bundles are covered with HDPE sheaths. According to the statistical data of the traffic volume of the management unit and the analysis of the vehicle load, if a car fire occurs, the maximum heat release rate is 10MW, and the flame height is 11m; if a bus fire occurs, the maximum heat release rate is 30MW, and the flame height is 12m; In the case of a truck fire, the maximum heat release rate is 80MW and the flame height is 24m; in the case of an oil tanker fire, the maximum heat release rate is 200MW and the flame height is 28m.

[0043] Firstly, according to the principle that the temperature of the outer surface of the stay cable sheath does not exceed the ignition point of the sheath in case of a car, passenger car, or truck fire, determine the overall scope of the stay cable that needs to ...

Embodiment 2

[0054] In the cable-stayed bridge in this embodiment, the cable-stay cables are standard hot-extruded polyethylene high-strength steel wire cable structures, and the galvanized steel wire bundles are covered with HDPE sheaths. According to the statistical data of the traffic volume of the management unit and the analysis of the vehicle load, if a car fire occurs, the maximum heat release rate is 10MW, and the flame height is 11m; if a bus fire occurs, the maximum heat release rate is 30MW, and the flame height is 12m; In the case of a truck fire, the maximum heat release rate is 150MW and the flame height is 30m; in the case of an oil tanker fire, the maximum heat release rate is 300MW and the flame height is 39m.

[0055] Firstly, according to the principle that the temperature of the outer surface of the stay cable sheath does not exceed the ignition point of the sheath in case of a car, passenger car, or truck fire, determine the overall scope of the stay cable that needs to...

Embodiment 3

[0066] In meeting the protection division in the present invention: the first-level protection area, the vertical distance from the bridge deck is 11m to 20m, and the heat insulation and fire resistance protection meeting the protection standard A is adopted; the second-level protection area, the vertical distance from the bridge deck is less than 11m, and the simultaneous To meet the requirements of protection standard A and protection standard B for heat insulation and fire protection, this embodiment conducts a specific test on the specific wrapping process.

[0067] The stay cable in this embodiment has a diameter of 117mm, the innermost layer is steel bundle, the outer layer is HDPE sheath, and the inner layer of HDPE sheath is PVF wrapping tape.

[0068] The heat insulation and fire resistance protection method of bridge stay cables using basalt fiber composite materials comprises the following steps:

[0069] (1) For the convenience of construction, take the wrapping ta...

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Abstract

The invention relates to a construction method of a heat-insulated and fire-resistant graded protection structure for cable-stayed cables of a bridge. The cable-stayed cables are protected in different areas, including: the first-level protection area, the vertical distance from the bridge deck is 11m to 20m, and the protection standard A is adopted. In the secondary protection area, the vertical distance from the bridge deck is less than 11m, and the heat insulation and fire protection that meets both protection standard A and protection standard B is adopted. The winding directions of the fiber composite wrapping tapes in the heat insulation and fire protection structures A and B are respectively 30°<α 1 ≤35°, 15°≤α 2 ≤30°. Compared with the prior art, the heat insulation and fire resistance protection method of the bridge stay cables in the present invention can set areas with different protection levels along the height of the stay cables according to the fire performance characteristics of the stay cables under different types of vehicle fires , with less amount of protective materials to achieve the target demand of the stay cable "no damage to oil tanker fires, no damage to cars, buses, and trucks", which significantly improves the economy of the protection system.

Description

technical field [0001] The invention relates to the technical field of cable system protection for bridge engineering, in particular to a heat-insulating and fire-resistant graded protection structure for cable-stayed cables of a bridge and a construction method thereof. Background technique [0002] The loss of people's lives and properties caused by bridge fires is huge, especially for some large cable-stayed bridges as the throat of traffic. Once a fire occurs, it is bound to stop using within a certain period of time, causing huge economic losses and social impact. As an important component of a cable-stayed bridge, cable-stayed cables play a key role in the operation process, transferring the huge tensile load of the main girder to the bridge tower. Since the stay cables are located above the bridge deck, they are usually relatively close to the roadway. Once a fire breaks out on the cable-stayed bridge, it may affect the stay cables. At present, the cables of cable-st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D19/16E01D11/04E01D21/00E01D101/00
CPCE01D11/04E01D19/16E01D21/00E01D2101/00
Inventor 张少锦阮欣赵超霍宁宁王勇薛晓薇
Owner 广州珠江黄埔大桥建设有限公司