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Fireproof thermal-insulation layer of tunnel and construction method thereof

A construction method and technology of fire-proof and heat-insulating boards, which are applied in tunnels, tunnel linings, fire prevention, etc., can solve the problems of fire-proof and heat-preservation difficulties, and achieve the effects of good heat preservation and heat insulation performance, easy replacement and disassembly, and good flexibility

Active Publication Date: 2010-02-03
湖南新纪元建设发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a fire-proof and heat-insulating layer of a tunnel, which can effectively solve the problem of difficult fire-proof and heat-preservation in some regions with harsh climates such as the Northwest. , to reduce the freezing damage to the tunnel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: prepare fireproof board (being fireproof layer)

[0032] According to magnesium oxide 48.7%, expanded perlite 2.4%, sawdust 1.5%, talcum powder 2.9%, magnesium chloride 43.9%, medium alkali glass fiber silk 0.12%, polybutadiene epoxy resin 0.24% (molecular weight (M) is 2000 , the functionality (f) is 2.3, the epoxy value is 0.36, and the appearance is a yellow viscous liquid), aluminum dihydrogen phosphate water repellent 0.24% and weighed ingredients.

[0033] The preparation steps are:

[0034] ①. Weigh the above raw materials according to the above ratio;

[0035] ②. Prepare an aqueous solution of magnesium chloride, with a glassy magnesium degree of 20-30 degrees, and stir evenly;

[0036] ③. Put the above raw materials (except glass fiber cloth and non-woven fabric) into the mixer and stir evenly, which is called mixing material;

[0037] ④ Put the mixing material into the hopper, spread glass fiber cloth and non-woven fabric in the fireproof boar...

Embodiment 2

[0042] Embodiment 2: prepare fireproof board (being fireproof layer)

[0043] Magnesium oxide 36%, expanded perlite 5.0%, sawdust 6.4%, talcum powder 6.5%, magnesium chloride 37.2%, medium alkali glass fiber 3.89%, polybutadiene epoxy resin 1.07%, aluminum dihydrogen phosphate water-resistant Agent 0.74% weighs batching, (step is with embodiment 1). The obtained product is tested according to the existing national standard, and the RABT temperature rise curve shows that the fire resistance limit is 200-230 minutes when the thickness is 15-18mm; the deflection value of the initial crack on the surface of the plate is 11.6%.

Embodiment 3

[0044] Embodiment 3: prepare fireproof board (being fireproof layer)

[0045]Magnesium oxide 35.8%, expanded perlite 7.4%, sawdust 7.5%, talcum powder 9.5%, magnesium chloride 36.3%, medium alkali glass fiber 2.0%, polybutadiene epoxy resin 0.98%, aluminum dihydrogen phosphate water-resistant Agent 0.52% weighs batching, (step is with embodiment 1). The obtained product is tested according to the existing national standard, the RABT temperature rise curve, the fire resistance limit is 200-230 minutes when the thickness is 15-18mm, and the initial crack deflection value on the surface of the plate is 11.2%.

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Abstract

The invention relates to a fireproof thermal-insulation layer of a tunnel and a construction method thereof, wherein the fireproof thermal-insulation layer comprises a polyurethane thermal-insulationlayer connected with two linings of the tunnel and an external fireproof layer, wherein the fireproof layer is made by pressing one or two kinds of medium-alkali glass fiber cloth and non-woven fabricwhich are taken as basal materials and waterproof and fireproof components. The fireproof thermal-insulation layer of the tunnel can effectively solve the problem that the fire prevention and the thermal insulation are difficult in atrocious climatic environment areas, such as northwest parts in China, has excellent fireproof performance, good thermal insulation performance and favorable waterproof performance and reduces the freezing injury to the tunnel. The invention also provides the construction method of the fireproof thermal insulation layer of the tunnel, which is convenient, rapid and firm.

Description

technical field [0001] The invention belongs to the technical field of fireproofing and heat preservation of tunnels, and in particular relates to a fireproof heat preservation layer for tunnels in cold and severe cold regions and a method for constructing and installing the fireproof heat preservation layer on the tunnel. Background technique [0002] Tunnel fire protection and thermal insulation systems are rarely used at home and abroad at present. The most widely used is the direct spraying of fireproof coatings on the surface of tunnels. In the ratio of tunnel fireproof coatings, the proportion of cement must be within a certain range. Beyond this range, the thermal conductivity becomes equivalent. High, the fire resistance limit cannot be reached at all. However, the bonding strength in this cement ratio is very low, which cannot reach the standard of GA98-2005 at all. The solution is to add organic building glue to modify the fire-resistant coating to increase the bon...

Claims

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Application Information

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IPC IPC(8): E21D11/38E21F5/00C04B28/32C08L75/04
CPCC04B2111/28C04B28/32C04B2111/27C04B41/509C04B2111/00724C04B41/009C04B2111/00612
Inventor 吴道新喻杰杨正辉樊华严爱国
Owner 湖南新纪元建设发展有限公司
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