JP3471400B2 - Finishing method of the road bridge sidewalk - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of finishing a road bridge sidewalk portion which has excellent workability, is preferable in terms of safety and health, and can be constructed in a short construction period.

[0002]

2. Description of the Related Art Generally, concrete slabs for road bridges are
It is formed as the bottom of the road on the top of the main girder of the road bridge.
This concrete floor slab has a smaller member thickness than other concrete members used for road bridges, and is exposed to vibration due to the passage of vehicles and severe environmental conditions, so that the surface is likely to deteriorate or crack. As a result, rainwater and the like permeate into the floor slab, accelerate deterioration of concrete and corrosion of reinforcing bars inside the floor slab, and thus significantly reduce the durability of the floor slab.

When the bridge surface is splashed in the area where the anti-freezing agent is sprayed on the road surface or near the coast,
Chloride that permeates the concrete slab corrodes the reinforcing bars inside the slab, significantly reducing the load bearing capacity of the slab.

Therefore, in order to prevent rainwater and chloride from flowing into and permeating into the concrete floor slab and to improve the durability of the concrete floor slab, a waterproof layer is provided between the floor slab and the finishing layer (asphalt pavement, concrete pavement, etc.). The number of constructions is increasing.

On the other hand, interest in the aesthetics of civil engineering structures is increasing, and there is an increasing demand for using tile stones or the like in place of asphalt pavement and concrete pavement that have been conventionally used for finishing walkways.

Conventionally, there are roughly three methods for waterproofing. Adopting three conventional waterproof construction methods,
When finishing materials such as tiles and stones are applied, the waterproof finishing structure as shown in FIGS. 2 to 4 is obtained.

FIG. 2 shows the case where a waterproof sheet is used. After a reinforced concrete floor slab 12 is formed on the upper part of the main girder of a road bridge, which is the bottom of the road, a non-woven fabric is impregnated with rubber asphalt. The 4.0 mm sheet 18 is adhered. First, in order to secure adhesion to the concrete floor slab 12, a rubber-based adhesive containing 50 to 80% of a solvent or a rubber-containing asphalt-based adhesive 14 is applied twice so that there are no cracks. Next, the rubber-coated asphalt 16 for adhesion is heated and melted from 200 ° C. to 260 ° C., poured onto the floor slab surface to bond the sheet 18, and concrete or asphalt pavement 20 is applied thereon.

When the tile 22 is adhered, the mortar 24 is used for adhesion, which requires a large number of working steps.
It takes a long construction period. There is also a safety and health problem because an adhesive containing high heat asphalt or solvent is used. Moreover, since the tiles and the finishing material 22 bonded with the mortar 24 are cracked or peeled off because of being exposed to vibration and severe environmental conditions.

Further, the thickness from the floor slab surface to the tile and the load are large, which is not preferable in the design of bridge dyeing.

FIG. 3 shows a waterproof structure provided with a coating film waterproof layer. First, in order to secure the adhesion to the concrete floor slab 12, the chloroprene rubber-based adhesive 26 containing 75% to 90% of a solvent in addition to chloroprene rubber, synthetic resin, filler, etc. is divided into 1 to 2 times. Apply.

Next, a waterproofing agent 28 having a composition similar to that of the above-mentioned adhesive and having a solvent content of 30% to 50% is applied in 3 to 5 times so as not to have a nick, and then, Do concrete or asphalt pavement 20 on top.

When the tiles 22 are bonded, as in the method shown in FIG. 2, many work steps are required and the construction period is long. Since an adhesive containing a solvent is used, there is a problem in safety and hygiene, and since it is exposed to vibration and severe environmental conditions, there is a problem that the tile and the finishing material bonded with the mortar 24 are cracked or peeled off.

FIG. 4 shows a waterproof structure in which a pavement waterproof layer is provided. First, in order to secure adhesion to the concrete floor slab 12, a rubber-containing asphalt adhesive 30 containing 50% to 80% of a solvent is applied. Next, asphalt 32 containing about 90% of aggregate is laid in a thickness of 15 mm to 25 mm. After that, asphalt pavement 20 is carried out after applying an asphalt emulsion 34 in order to secure the adhesion to the asphalt pavement.

When the tiles 22 are bonded, as in the method shown in FIG. 2, many work steps are required and the construction period is long. There is also a safety and health problem because an adhesive containing high heat asphalt or solvent is used. In addition, since it is exposed to vibration and severe environmental conditions, tiles and finishing materials 2 bonded with mortar 24
The problem that 2 is cracked or peeled off is the same as in the case of FIGS. 2 and 3, and the same drawbacks that the overall thickness and weight are large.

[0015]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, is excellent in waterproof effect and vibration followability, and can significantly shorten the finishing construction period, and It is an object of the present invention to provide a method for finishing a road bridge sidewalk part, which is capable of greatly reducing the thickness and weight of the obtained waterproof structure.

[0016]

In order to solve the above-mentioned problems, in the finishing method of the road bridge sidewalk part of the present invention,
When performing waterproofing and surface finishing on the sidewalks of road bridges, modify the concrete floor slab of the sidewalks of road bridges with modified silicone.
Resin type, urethane resin type, and flexible epoxy resin type
At least one kind of elastic adhesive was applied and a surface finishing material such as a tile was attached. According to the elastic adhesive, the cured film has waterproofness and rubber-like elasticity, and therefore the object of the present invention can be suitably achieved. If the surface of the concrete floor slab has large irregularities, mortar may be applied to make the surface smooth as necessary.

Specifically, an elastic adhesive is applied to a concrete floor slab surface cleaned with a grinder, a vacuum type power brush or the like to bond a finishing material such as tiles.

The coating thickness of the elastic adhesive is 1 mm to 3 m
It is preferably about m, more preferably 2 mm or more.
In the case of the present invention, by using an elastic adhesive and taking an adhesive layer of about 1 mm to 3 mm, preferably 2 mm or more, a sufficient waterproof effect as well as a sufficient adhesive effect and vibration followability can be obtained.

Further, the curing period can be set to allow walking in about one day, which contributes to shortening the construction period and reducing the total weight of the structure.

The types of elastic adhesives that can be used in the present invention include modified silicone resin type, urethane resin type,
Acrylic resin-based, flexible epoxy resin-based, silicone resin-based, polysulfide resin-based, SBR-based, and the like can be mentioned, but more preferably, it is not necessary to use a primer, and it is a non-dissolving type and has durability and adhesiveness. Excellent modified silicone resin adhesive.

The modified silicone resin adhesive is an adhesive containing a modified silicone resin as an essential component in the composition. The modified silicone resin is a polymer compound having one or more reactive silicon groups in the molecule, for example, JP-A-50-156599, JP-A-52-73998, and JP-A-58-10418. JP-A-62-2
Compounds such as those proposed in 30822 and the like, and organic silicon compounds having at least two or more silicon atoms to which a hydrolyzable group is bonded as shown in JP-A-63-12677. is there.

In addition, JP-A-60-31556,
JP-A-60-228516, JP-A-63-112
642, a composition composed of an oxyalkylene polymer having a silicon group and a (meth) acrylate (co) polymer having a silicon group proposed in JP-A-1-131127 can be mentioned.

[0023]

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a case where the tile 22 is bonded to the sidewalk portion of the concrete floor slab 12 of the road bridge by using the two-pack type modified silicone elastic adhesive 36 which also serves as a waterproof layer.

PM220 [made by Cemedine Co., Ltd.] was used as a two-pack type modified silicone-based elastic adhesive. When working, the pot life at 20 ° C is 120 minutes and the viscosity is 1
A 000 poise malleable adhesive was used.

In the process, the concrete floor slab was cleaned with a grinder, a vacuum type power brush or the like. Also, the machine oil and engine oil attached to the floor slab are
It was wiped with a cloth soaked with an organic solvent.

Next, after mixing the elastic adhesive in a predetermined mixing ratio, it is uniformly applied to the concrete floor slab surface with a plastering iron,
The tiles were quickly attached and the bonding work was completed. The coating thickness of the elastic adhesive at this time was about 2 mm.
The elastic adhesive layer began to develop strength after about 3 hours, and after about 1 day, an adhesive layer excellent in vibration absorption was obtained which also functions as a waterproof coating film.

[0027]

As described above, according to the method of finishing the road bridge sidewalk portion of the present invention, the waterproof effect and the vibration followability are excellent, and the finishing construction period can be greatly shortened.
In addition, there is a great effect that the thickness and weight of the obtained waterproof structure are significantly reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing a waterproof structure of a sidewalk portion of a road bridge formed by the method of the present invention.

FIG. 2 is a cross-sectional view showing an example of a waterproof structure of a sidewalk portion of a road bridge formed by a conventional method.

FIG. 3 is a cross-sectional view showing another example of a waterproof structure of a sidewalk portion of a road bridge formed by a conventional method.

FIG. 4 is a cross-sectional view showing another example of a waterproof structure of a sidewalk portion of a road bridge formed by a conventional method.

[Explanation of symbols]

12 Concrete floor slab 22 tiles 36 Elastic adhesive

Continuation of the front page (56) Reference JP-A-3-263421 (JP, A) JP-A-5-59702 (JP, A) JP-A-5-65753 (JP, A) Actual development Sho-60-18109 (JP , U) Actual Kaihei 5-38147 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E01C 15/00 E01D 19/12

Claims (2)

(57) [Claims] [Claim 1] When performing waterproofing and surface finishing of a road bridge sidewalk part, a concrete floor slab of the road bridge sidewalk part is used.
Modified silicone resin type, urethane resin type, and flexible
A method of finishing a pedestrian part of a road bridge, characterized by applying at least one kind of epoxy resin type elastic adhesive and applying a surface finishing material such as tile. 2. A concrete floor slab and a modified silicone resin
Low in oil type, urethane resin type, and flexible epoxy resin type
The finishing structure for a road bridge sidewalk portion formed by the method according to claim 1, which is composed of an elastic adhesive layer formed of at least one kind of elastic adhesive and a surface finish material.