JPH0474481B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a waterproofing method for steel deck slabs of pedestrian bridges and railway bridges. Steel deck bridges are used for bridging relatively long spans, and are said to be more prone to defects than concrete deck bridges. For example, it is said that a deflection limit value of about 3 to 4 times that of a concrete deck slab is allowed, and a steel deck slab has great flexibility. For this reason, steel deck pavement requires more attention than concrete deck pavement. In other words, steel deck slabs (1) have protruding splice plates, rivets, etc., which tends to result in uneven paving. (2) Because the modulus of the steel deck changes around the splice plate, stress concentration tends to occur in the pavement. (3) Waterproofness is required to be higher than that of concrete slabs. For this reason, goose asphalt pavement that also serves as a waterproof layer is sometimes used, but in the case of goose asphalt pavement, there are problems with flow resistance, uneven construction, quality control problems, and high costs. There are drawbacks. The present invention aims to solve these drawbacks by applying a primer to the steel deck, drying it,
On top of that, organic solvent-based asphalt is applied,
Immediately attach reticulated fibers and dry-cure.
After that, room-temperature waterproofing material is applied and impregnated onto the reticulated fibers, dried and cured, and then a dense-grained heated composite material is laid on top of the material, making it possible to integrate everything from the steel deck to the composite material. do. The present invention will be explained below. In the waterproofing method when performing dense-grain asphalt concrete pavement on steel deck slabs, as a pretreatment, oil and rust on the steel deck surface are cleaned using sandblasting, brushes, scrapers, shot blasting, etc., and then the surface is coated with A primer made of organic solvent-type asphalt, which is made by diluting modified asphalt with chloroprene, resin, etc. added to asphalt, with an organic solvent such as xylene or benzene, is applied uniformly at a ratio of 0.2 to 0.4/ ^m2 using a brush or roller brush. Apply on the skin and cure for 2 to 3 hours. After drying and curing the above primer, apply the same organic solvent-based asphalt at 0.5 to 1.0/ ^m2 , immediately lay the reticulated fibers, shape the wrinkles caused by using a rubber rake or deck brush, and then dry and cure. Let's do it. As a result, after the organic solvent-based asphalt dries, the reticulated fibers are firmly fixed. Next, a room-temperature waterproofing material is applied and impregnated onto the surface of the reticulated fibers using a rake or the like, and dried and cured for 12 to 24 hours. After that, asphalt heated to about 160 to 180°C is used as a binder, aggregates of various particle sizes are combined so as to reduce the porosity, and a dense-grain heated composite material is created by heating and mixing. In addition, when it is desired to shorten the drying time of the above-mentioned room-temperature waterproof material, for example, when there is a concern about rainy weather or when it is necessary to quickly pave the heated mixture, it is also possible to spray a special decomposing agent. The above-mentioned reticulated fibers include nonwoven fabrics, woven fabrics, felts, etc. made of organic fibers, inorganic fibers, and the like. Examples will be described below. The survey was carried out on a steel deck bridge surface of approximately ^100m2 . First, the surface rust was removed by sandblasting and cleaned with thinner. After cleaning, organic solvent-based asphalt shown in Table 1, which is a mixture of modified asphalt and 30% xylene, was applied as a primer at 0.3/m ² using a brush. After application, dry curing was performed for 2 hours. Thereafter, the organic solvent type asphalt was applied with a brush at 0.6/m ² as a fixing material for the reticulated fibers, which also serves as base waterproofing, and the reticulated fibers were laid immediately after that. The reticulated fiber used this time was a polyester-based single-sided resin-treated nonwoven fabric developed for waterproofing steel deck slabs, and was laid with the resin-treated side facing up. After laying, the wrinkles of the nonwoven fabric were removed using a rubber rake, and the fabric was dried and cured for 12 hours. After drying and curing, apply the room temperature waterproofing material shown in Tables 2 and 3 on the surface of the nonwoven fabric using a rubber rake.
It was coated and impregnated with ² m2, and dried and cured for 12 hours.

【table】

【table】

【table】

[Table] According to the above-mentioned waterproofing construction, there was little damage to the waterproof layer and there was no need for a mold release agent, even though tires and caterpillars ran during the paving of the composite material. Figure 1 is a cross-sectional view of a specimen prepared indoors and tested for water permeability; 1 is a steel deck slab;
3 is a modified asphalt, 3 is a nonwoven fabric, 4 is a room temperature waterproof material, and 5 is a glass cylinder erected on the room temperature waterproof material 4, and a colored water 6 is placed inside to a height of 250 mm. Even if this was left for 48 hours, no water permeation was observed. Figure 2 is a graph of the shear strength test conducted using a tensile tester, with the vertical axis representing shear strength and the horizontal axis representing temperature, and the shear force loading shown in Figure 3 at a loading rate of 5 mm/min. . In the figure, 7 is a steel deck slab, 8 is a waterproof layer, and 9 is a composite material. According to the present invention as described above, since all construction is performed on site at room temperature, the construction unit cost is low and there is an effect that there is no danger of burn accidents. Furthermore, since the waterproof layer uses reticulated fiber as a core material, it has advantages such as extremely high tensile and tear strength.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the water resistance test, Figure 2 is a graph showing the relationship between shear stress and temperature of the waterproof layer.
FIG. 3 is an explanatory diagram of a test that yields the numerical values shown in the graph of FIG. 2.

Claims (1)

[Claims] 1 Apply a primer made of organic solvent-based asphalt to the steel deck slab, let it dry, then apply the above-mentioned organic solvent-based asphalt again on top of it, immediately apply reticulated fibers, dry and cure, and then apply room-temperature waterproofing material in reticulated form. A method for waterproofing steel deck slabs, which is characterized by coating and impregnating fibers, drying and curing them, and paving a dense-grain heated composite material to integrate the steel deck slab and the dense-grain heated composite material.