Stay cable fire-resistant protection structure

Abstract

The utility model discloses a stay cable fire-resistant protection structure which comprises a heat insulation layer, a water insulation layer and a fire insulation layer, and the heat insulation layer is a high-temperature-resistant composite aerogel heat insulation felt and wraps the outer surface of a stay cable; the water-resisting layer is aluminum foil and wraps the high-temperature-resistant composite aerogel heat-insulating felt; the fire insulation layer is a sleeve and a wrapping belt, the sleeve is a Haver sleeve or a stainless steel sleeve and wraps the aluminum foil, and the wrapping belt is wound outside the Haver sleeve or the stainless steel sleeve. A viscous coating is arranged on the inner layer of the high-temperature-resistant composite aerogel heat insulation felt and can be adhered to the outer surface of the stay cable, so that connection is convenient, and slippage is prevented; the wrapping belt is a fluorocarbon wrapping belt, and is high in elasticity and resistant to corrosion. The fireproof structure is stable in protection performance and flat and attractive in appearance.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable technology field, concretely relates to a cable-stayed cable fireproof structure. BACKGROUND

[0002] Cable-stayed cable is the main load-bearing component that directly transmits the weight of the main girder and deck of the cable-stayed bridge to the tower, and its safety has an important influence on the safe operation of the whole bridge. In daily traffic transportation, vehicles loaded with flammable and explosive materials such as chemical raw materials and crude oil will have an impact on the cable-stayed cable when passing through the bridge, and then affect the stress structure of the whole bridge, bringing huge safety risks. Therefore, it is necessary to protect it from fire. In the existing protection structure, fireproof sealant is usually applied to the outermost layer of the fireproof structure, which can play a role in fireproofing and corrosion resistance. However, the cable-stayed cable will often vibrate and stretch due to vehicle driving or wind blowing, and after a long time, the fireproof sealant will exceed the tensile limit and crack, which not only affects the appearance of the whole cable-stayed cable, but also causes the inner layer to be eroded, affecting the fireproof effect. SUMMARY

[0003] In order to overcome the defects in the prior art, the utility model provides a cable-stayed cable fireproof structure, which can maintain the appearance of the fireproof structure and maintain its fireproof performance.

[0004] The technical scheme adopted by the utility model is: a cable-stayed cable fireproof structure is provided with a heat insulation layer and a fire insulation layer from inside to outside; the heat insulation layer is a high-temperature-resistant composite aerogel insulation felt, which is wrapped on the outer surface of the cable-stayed cable; the fire insulation layer is a sleeve and a wrapping belt, the sleeve is a Havre sleeve or a stainless steel sleeve, which is wrapped on the outside of the high-temperature-resistant composite aerogel insulation felt; and the wrapping belt is wound on the outer surface of the sleeve.

[0005] As a further improvement of the utility model, a water insulation layer is further arranged between the heat insulation layer and the fire insulation layer, the water insulation layer is an aluminum foil, which is wrapped on the outer surface of the high-temperature-resistant composite aerogel insulation felt.

[0006] As a further improvement of the utility model, the wrapping belt is a fluorocarbon wrapping belt.

[0007] As a further improvement of the utility model, the Havre sleeve is composed of a plurality of identical half-circular sleeves, the half-circular sleeves are misaligned and spliced, and are buckled on the outside of the aluminum foil.

[0008] As a further improvement of the utility model, the stainless steel sleeve is a cylindrical structure bent from a steel plate, and the longitudinal splicing part of the single stainless steel sleeve and the transverse splicing part between the upper and lower stainless steel sleeves are fixed by welding.

[0009] As a further improvement of the utility model, the thickness of the high-temperature-resistant composite aerogel heat insulation felt is 7-10mm on the cable-stayed cable above the bridge deck to the height of 13m, and the thickness of the high-temperature-resistant composite aerogel heat insulation felt is 4-6mm on the cable-stayed cable from the height of 13m to 21m.

[0010] As a further improvement of the utility model, the inner surface of the high-temperature-resistant composite aerogel heat insulation felt is provided with a sticky coating.

[0011] As a further improvement of the utility model, the high-temperature-resistant composite aerogel heat insulation felt is wrapped on the outer surface of the cable-stayed cable through splicing or spiral winding and is fastened and connected with the cable-stayed cable through a stainless steel cable tie.

[0012] As a further improvement of the utility model, the spacing of the stainless steel cable tie is 10cm.

[0013] The utility model has the advantages of:

[0014] (1) the protective structure can play a heat insulation role by forming a heat insulation layer through the high-temperature-resistant composite aerogel heat insulation felt, and the high-temperature-resistant composite aerogel heat insulation felt is stable in state, the wrapping effect is easy to guarantee during construction, and the protective structure is stable and is not easy to crack due to long-time vibration and stretching of the cable-stayed cable after construction is completed.

[0015] (2) the cracking and falling problems of the flame-retardant sealing glue can be avoided by cooperating with the Haver sleeve pipe or the stainless steel sleeve pipe and the wrapping belt, the fireproof structure is more stable, the Haver sleeve pipe or the stainless steel sleeve pipe has the fireproof function on one hand and serves as the winding carrier of the wrapping belt on the other hand, the surface of the sleeve pipe is smooth, the wrapping belt is more convenient to wind on the sleeve pipe, the surface of the fireproof structure is also smoother after winding is completed, the sealing property is good, and the appearance is more beautiful.

[0016] (3) the aluminum foil arranged between the high-temperature-resistant composite aerogel heat insulation felt and the Haver sleeve pipe or the stainless steel sleeve pipe can play a waterproof blocking role, thereby protecting the internal heat insulation layer from being damp, and making the internal structure performance more stable.

[0017] (4) according to the characteristics of the fire on the bridge, different thicknesses of the high-temperature-resistant composite aerogel heat insulation felt are arranged on the cable-stayed cables at different heights, the fire can be prevented with emphasis, and the cost is saved.

[0018] (5) the fireproof structure forms a multi-layer protection system by the inner heat insulation layer, the middle waterproof and moisture-proof layer and the outer fireproof layer, can effectively cope with the fire and rain erosion, and thereby protects the cable-stayed cable integrally. BRIEF DESCRIPTION OF DRAWINGS

[0019] The utility model will be further explained in detail in combination with the drawings and specific embodiments.

[0020] Figure 1 is the cable-stayed cable fireproof structure schematic diagram of the utility model;

[0021] Figure 2 is the harver sleeve pipe cooperation splicing schematic diagram;

[0022] Figure 3 is the stainless steel sleeve pipe splicing schematic diagram;

[0023] In the figure, 1 is high temperature resistant composite aerogel insulation felt, 2 is aluminum foil, 3 is sleeve pipe, 31 is harver sleeve pipe, 311 is half-round sleeve pipe, 32 is stainless steel sleeve pipe, 4 is wrapping tape, 5 is cable-stayed cable. DETAILED DESCRIPTION

[0024] As Figure 1 shown, the utility model relates to a cable-stayed cable fireproof structure, including heat insulation layer and fireproof layer, wherein heat insulation layer is high temperature resistant composite aerogel insulation felt 1, is located in the innermost layer, and is directly contacted with the outer surface of cable-stayed cable 5, and is covered on the outer surface of cable-stayed cable 5. High temperature resistant composite aerogel insulation felt 1 has excellent heat insulation performance, and its thermal conductivity is far lower than that of conventional materials, which can effectively prevent heat transfer. Before installing high temperature resistant composite aerogel insulation felt 1, cable-stayed cable 5 needs to be cleaned. From the bottom of cable-stayed cable 5, install upwards, and single high temperature resistant composite aerogel insulation felt 1 is sequentially spliced and tightly packed on the outer surface of cable-stayed cable 5. Alternatively, strip-shaped high temperature resistant composite aerogel insulation felt 1 is wound on the outer surface of cable-stayed cable 5 at a certain angle. After splicing or winding connection, stainless steel cable ties are used for bundling, and the spacing of stainless steel cable ties is 10cm. An adhesive coating is arranged on the inner layer of high temperature resistant composite aerogel insulation felt 1, which can be pasted on the outer surface of cable-stayed cable 5, facilitating fixation and preventing slipping.

[0025] In the embodiment, a water barrier layer is further arranged between the heat insulation layer and the fireproof layer, specifically, the water barrier layer is aluminum foil 2, and the aluminum foil 2 is covered on the outer surface of the high temperature resistant composite aerogel insulation felt 1. The aluminum foil 2 has good waterproof and moisture-proof performance, thereby effectively protecting the high temperature resistant composite aerogel insulation felt 1.

[0026] The fireproof layer is sleeve pipe 3 and wrapping tape 4, the sleeve pipe 3 is located on the inner side, and the wrapping tape 4 is located on the outer side. The sleeve pipe 3 is tightly buckled outside the aluminum foil 2. Specifically, the sleeve pipe 3 is harver sleeve pipe 31, wherein the single harver sleeve pipe 31 is 1.5 meters long. The harver sleeve pipe 31 has the advantages of high ring stiffness, strong tensile strength, high and low temperature resistance, excellent heat conductivity, good heat dissipation, strong flame retardance, smooth inner wall, safety and environmental protection, easy transportation and easy installation, etc. During installation, the harver sleeve pipe 31 is divided into two equal parts, that is, the 1.5-meter-long harver sleeve pipe 31 is divided into two equal halves from the middle, and each half is Figure 2The half-cylinder sleeve 311 is then spliced according to certain rules, that is, one half-cylinder sleeve 311 is wrapped around the left half of the aluminum foil, and the other two half-cylinder sleeves 311 are wrapped around the right half of the aluminum foil, and the splicing seams of the half-cylinder sleeves 311 are opposite to the half-cylinder sleeve 311 on the left side, that is, the half-cylinder sleeves 311 are spliced in a staggered manner or a staggered seam manner, which can make the combination of the entire Haver sleeve installed on the stay cable 5 more stable. The radius of the half-cylinder sleeve 311 is set to be able to tightly wrap the aluminum foil 2.

[0027] In some embodiments, the sleeve 3 is a stainless steel sleeve 32, as shown in Figure 3 A piece of stainless steel sheet is bent into a cylindrical shape, and is tightly wrapped around the outer surface of the aluminum foil 2 during installation, and then is fixed by welding at the splicing position, and the upper and lower stainless steel sleeves 32 are also fixed by welding.

[0028] The wrapping tape 4 is a fluorocarbon wrapping tape, which has a large elongation and good elasticity, can adapt to the expansion or cracking deformation of the base layer, has good high and low temperature resistance and can be used for a long time in the temperature range of -25-90°C, has good corrosion resistance and can resist the corrosion of acids, alkalis and salts, has stable performance, has self-extinguishing performance due to high chlorine content and good flame retardancy, and can self-extinguish when the fire source is removed during combustion.

[0029] During construction, the high-temperature composite aerogel insulation blanket 1 is bundled with stainless steel straps, which can form small dents on the bundled position of the high-temperature composite aerogel insulation blanket 1. If the wrapping tape is directly wound, uneven defects will appear on the appearance. By setting the Haver sleeve 31 or the stainless steel sleeve 32, the interior can be protected from fire, and the wrapping tape is wound on the Haver sleeve 31, so that the entire protective structure is more stable, and the appearance is more flat and beautiful. Since the wrapping of the wrapping tape is performed by a tool, the wrapping tape is placed on the Haver sleeve 31 or the stainless steel sleeve 32 with a certain hardness and is pushed upward along the stay cable 5, which is more convenient to operate and can ensure the flatness and quality of the wrapping.

[0030] When a fire breaks out on a bridge, the flame does not affect the entire height of the stay cable 5, and is most obvious at a height of 0-13 meters above the bridge deck, and is weakened above 13 meters. Therefore, when the high-temperature composite aerogel insulation blanket 1 is arranged, the thickness in the range of 0-13 meters is set to 6-10 mm, and preferably 7 mm. In the range of 13-21 meters, the thickness is set to 4-6 mm, and preferably 5 mm. By arranging in sections, the material cost can be saved.

[0031] In the prior art, the outer layer usually adopts fire-retardant sealant, and due to the vibration, swing or stretching of the cable-stayed cable 5, the fire-retardant sealant (solidified into solid) has certain ductility, but in the vibration of a long distance (several tens of meters), it may cause cracking, thereby affecting the protection quality and the aesthetic appearance. Moreover, the fire-retardant sealant is manually scraped, and the thickness is difficult to control, which not only affects the appearance, but also affects the overall protection quality. The outer layer of the protection structure is provided with the wrapping tape 4 which is strong in elasticity and excellent in corrosion resistance, which can effectively prevent the above problems, and the Hafnium sleeve 31 effectively supports the wrapping tape 4, and the installation is convenient, efficient and beautiful in the construction process, and the construction quality can be effectively controlled.

[0032] In addition, at the uppermost end of the entire fireproof structure, an anti-slip structure is arranged to prevent the entire fireproof structure from sliding downward along the cable-stayed cable 5 due to gravity. The anti-slip structure is composed of basalt fiber cloth and fire-retardant sealant, that is, a part of the basalt fiber cloth is wound on the outer surface of the fireproof structure with a winding length of about 25 cm, and a part of the basalt fiber cloth is wound on the cable-stayed cable 5 with a winding length of 25 cm, and then the fire-retardant sealant is applied on the basalt fiber cloth with a total length of 50 cm, thereby forming the anti-slip structure, which can prevent the fireproof structure from sliding downward and also prevent water from seeping into the end of the fireproof structure. Since the fire-retardant sealant is applied for a short distance, its tensile property is basically not affected.

[0033] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to this, and various changes can be made within the knowledge range possessed by the person skilled in the art without departing from the purpose of the utility model, which are all within the protection range of the utility model claim.

Claims

1. A stay cable fire resistant protection structure, characterized by, The inner and outer heat insulation layer and fireproof layer are provided; the heat insulation layer is a high-temperature-resistant composite aerogel insulation felt (1) covering the outer surface of the cable-stayed cable (5); the fireproof layer is a sleeve (3) and a wrapping tape (4), the sleeve (3) is a half sleeve (31) or a stainless steel sleeve (32) covering the outside of the high-temperature-resistant composite aerogel insulation felt (1); the wrapping tape (4) is wound on the outer surface of the sleeve (3).

2. A stay cable fire resistant protection structure according to claim 1, characterised in that, A water-proof layer is further provided between the heat insulation layer and the fireproof layer, the water-proof layer is an aluminum foil (2) covering the outer surface of the high-temperature-resistant composite aerogel insulation felt (1).

3. The stay cable fire resistant protective structure of claim 1, wherein, The wrapping tape (4) is a fluorocarbon wrapping tape.

4. The stay cable fire resistant protective structure of claim 2, wherein, The half sleeve (31) is composed of a plurality of identical half sleeves (311), the half sleeves (311) are staggered and spliced, and are buckled on the outside of the aluminum foil (2).

5. The stay cable fire resistant protective structure of claim 1, wherein, The stainless steel sleeve (32) is a cylindrical structure bent from a steel plate, the longitudinal splicing part of the single stainless steel sleeve (32) and the transverse splicing part between the upper and lower stainless steel sleeves (32) are fixed by welding.

6. The stay cable fire resistant protective structure of claim 1, wherein, The thickness of the high-temperature-resistant composite aerogel insulation felt (1) is 7-10mm on the cable-stayed cable (5) above the bridge deck to a height of 13m, and the thickness of the high-temperature-resistant composite aerogel insulation felt (1) is 4-6mm on the cable-stayed cable (5) from a height of 13m to 21m.

7. The stay cable fire resistant protective structure of claim 1, wherein, An adhesive coating is provided on the inner surface of the high-temperature-resistant composite aerogel insulation felt (1).

8. The stay cable fire resistant protective structure of claim 1, wherein, The high-temperature-resistant composite aerogel insulation felt (1) is wrapped on the outer surface of the cable-stayed cable (5) by splicing or spiral winding, and is tightly connected with the cable-stayed cable (5) by a stainless steel cable tie.

9. A stay cable fire resistant protection structure according to claim 8, wherein, The spacing of the stainless steel cable tie is 10cm.

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