JP2869361B2 - Waterproof construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproofing method, and more particularly to a waterproofing method capable of bonding a waterproof material in a short time.

[0002]

2. Description of the Related Art In order to reinforce existing bridges, elevated roads and the like, there is a construction of increasing the thickness of concrete slabs used for the bridges, elevated roads and the like.

[0003] In the thickening work of the concrete slab, the upper surface of the existing concrete slab is cut, concrete is poured into the cut upper surface of the concrete slab, and after the poured concrete is hardened, a waterproof material is applied. After that, it is paved with asphalt.

[0004] The above-mentioned waterproofing material is provided to prevent water from entering the concrete slab, thereby deteriorating the concrete slab and reducing its durability.

[0005]

In the above-mentioned work for increasing the thickness of the concrete floor slab, there is a problem that it takes a long time to apply a waterproof material after the poured concrete is hardened.

[0006] Particularly, in the case of existing bridges, elevated roads, etc., it is desired that the processing be carried out in a short time because construction is performed by blocking traffic.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. When a coating film-based waterproofing material is applied immediately after concrete is poured, the coating film-based waterproofing material adheres to concrete. It is an object of the present invention to provide a waterproofing method capable of treating concrete in a short period of time without waiting for the time for concrete to harden.

[0008]

In order to achieve the above-mentioned object, in the waterproofing method of the present invention, concrete is sprayed on a construction surface, a concrete layer is formed by driving, etc., and the concrete setting of the concrete layer is started. Prior to this, a coating film-based waterproofing material is brought into contact with the concrete layer, and a waterproofing layer made of the coating film-based waterproofing material is formed on the concrete layer.

The waterproofing method according to claim 2 is the waterproofing method according to claim 1, wherein the coating film-based waterproofing material is a modified asphalt coating film-based waterproofing material, a rubber as-based adhesive, a rubber as-based coating film-based waterproofing material, It is one of a rubber as emulsion, a synthetic rubber emulsion, and a synthetic rubber-based solvent-type waterproof coating material.

[0010]

【Example】

(Embodiment 1) A waterproofing method for thickening concrete slabs according to one embodiment of the present invention will be described. In order to reinforce existing bridges, elevated roads, etc., they are used for such bridges, elevated roads, and the like. There is construction work to increase the thickness of concrete slabs.

In the thickening work of the concrete slab, when increasing the thickness of the concrete slab used for an existing bridge, elevated road or the like, for example, by about 30 mm, first, the existing concrete slab is removed from the concrete slab. A concrete layer is formed by shaving about 20 mm from the upper surface of the slab and spraying concrete about 50 mm from the upper surface of the slab.

[0012] Concrete varies depending on its type, environmental conditions, and the like. For example, if the concrete is of an immediate effect, the concrete is sprayed and poured.
After about 10 minutes to about 30 minutes, setting of the cement in the concrete layer starts, and thereafter, hardening is completed in about 2 hours.

In the thickening work of the concrete slab of this embodiment, a concrete layer is formed on the construction surface by spraying and driving concrete, and before the concrete setting of the concrete layer starts (the setting of the cement is After the concrete is sprayed and poured in, for example, it starts in about 10 minutes to about 30 minutes. More preferably, the coating film-based waterproofing material is brought into contact with the concrete layer immediately after the concrete layer is formed before the cement starts to set in the concrete layer.

As a means for bringing the coating film-based waterproofing material into contact with the concrete layer, for example, a modified asphalt coating film-based waterproofing material shown in Table 1 which has been heated and melted at about 200 ° C. is applied.

As a result, a waterproof layer made of a coating film-based waterproof material is formed on the concrete layer, and the concrete layer and the waterproof layer are strongly bonded. [In this case, the concrete and the modified asphalt coating film-based waterproof material did not repel, had good wettability, and became familiar, and the modified asphalt coating film-based waterproof material wrapped the concrete. In addition, at the time of hydration of concrete, in the case of a modified asphalt coating waterproofing material having a certain degree of fluidity, the modified asphalt coating waterproofing material may be in a state of being sucked into the concrete,
It could be observed with an electron microscope. That is, even if the modified asphalt coating waterproofing material heated and melted at about 200 ° C. is applied to the concrete surface immediately after the concrete is poured in, the waterproofing layer formed by the coating waterproofing material does not evaporate moisture in the concrete. Did not fire.

As a result, after cooling of the waterproof layer, pinholes caused by foaming were not found in the waterproof layer, and a waterproof layer excellent in waterproof function could be formed.

Although this cannot be clearly explained in theory, the heat of the melt-modified asphalt coating film-based waterproofing material and the water vapor generated by the moisture in the concrete are immediately absorbed by the cement before hydration. it is conceivable that.

As a comparative example, a coating-type waterproofing material, which was heated and melted at about 200 ° C. by adding water to the surface of hardened concrete, for example, a modified asphalt coating-type waterproofing material shown in Table 1. When I applied the material and saw it, the applied rubber asphalt foamed violently while making a crackling sound,
After cooling, countless pinholes remained on the coated surface of the modified asphalt coating film-based waterproofing material and were not adhered.

According to this embodiment, since the concrete layer and the waterproof layer made of the coating film-based waterproof material are strongly adhered in a short time,
After bonding, pavement work can be started on the waterproof layer, and after the work, resistance to mechanical action such as starting and stopping of the vehicle increases.

Further, since the coating film-based waterproofing material penetrates into the concrete structure, there is no room for blistering on the concrete and the coating film-based waterproofing surface, and blistering (blistering) due to heat during pavement work is prevented. Can be.

Further, after the concrete is hydrated and hardened, it is desirable to cure the water contained in the concrete so as not to evaporate as much as possible.

As described above, when the concrete is uncured, a waterproof layer is formed with a coating film-based waterproof material, and the waterproof layer can also serve as a curing sheet. You can make a strong concrete floor slab.

Table 1 shows a formulation example of the modified asphalt coating film-based waterproofing material.

[0024]

[Table 1]

(Embodiment 2) Although the above-described embodiment is a repair work for a concrete slab in which the thickness of an existing concrete slab is increased, the present invention can be similarly applied to a new construction work.

That is, a concrete layer is formed by spraying and driving concrete on the construction surface, and before the start of cement setting of the concrete layer (the setting of cement differs depending on the type of cement, environmental conditions, etc. After spraying, for example, about 10
It starts in about 30 minutes, so spray concrete.
About 10 minutes to about 30 minutes before the driving, the coating film-based waterproofing material is brought into contact with the concrete layer. ), More preferably, immediately after the concrete layer is formed before the concrete setting of the concrete layer starts, a coating film-based waterproofing material is brought into contact with the concrete layer, and the concrete layer is coated with the coating film-based waterproofing material. It forms a waterproof layer.

Concretely, a cement (ultra-hardened cement, Sumitomo Osaka Cement Co., Ltd., trade name: Jet Cement) of 1 in volume ratio, silica sand of No. 6 in 2 and water of 0.7 in volume ratio was rapidly stirred. , Pour into mold and level the surface with iron.

Immediately thereafter, a coating-based waterproofing material (for example, a modified asphalt coating-based waterproofing material shown in Table 1) heated and melted at about 200 ° C. was applied to the surface of concrete with a metal spatula to a thickness of about 1 mm. Smear.

At this time, the melt-modified asphalt coating film-based waterproofing material did not show blistering, foaming, or generation of a crackling sound accompanying foaming.

Two hours after the application, the concrete hardens, and the applied modified asphalt-coated waterproofing material adheres to the concrete, and even if it is peeled off by hand, the modified asphalt-coated waterproofing material becomes cohesive and breaks down. Could not be exposed.

No pinholes were formed on the surface of the applied modified asphalt coating film-based waterproofing material. Furthermore, when a large vehicle was passed over the waterproof layer formed of the modified asphalt-coated waterproofing material, the surface of the concrete was not exposed, and it was in a state of being sufficiently durable.

(Example 3) In the same manner as in Example 2, in terms of volume ratio, cement (super-rapid hardening cement, jet cement manufactured by Sumitomo Osaka Cement Co., Ltd.), silica sand of No. 6 and water of 0.7 were used. The mixture was quickly stirred, poured into a mold, and the surface was leveled with an iron.

Immediately thereafter, a coating film-based waterproofing agent heated and melted at about 200 ° C., for example, a modified asphalt coating film-based waterproofing material shown in Table 1 was sprayed using a spray gun to form a coating film.

In Example 3, as in Examples 1 and 2, the melt-modified asphalt coating film-based waterproofing material did not show blistering, foaming, or generation of a crackling sound accompanying foaming.

Example 4 In the same manner as in Example 3, in terms of volume ratio, cement (ultra-fast setting cement, jet cement manufactured by Sumitomo Osaka Cement Co., Ltd.), No. 6 silica sand, and water 0.7 The mixture was quickly stirred, poured into a mold, and the surface was leveled with an iron.

Immediately thereafter, a rubber adhesive (for example,
Shizuoka Bitumen Industry Co., Ltd., trade name SR Prime G) was applied.

After 2 hours, the concrete hardened, and the rubber adhesive strongly adhered to the concrete, and even if the rubber adhesive was rubbed off with a finger, the concrete surface was not exposed.

The solvent contained in the rubber-based adhesive was already volatilized, the odor of the solvent was eliminated, and no pinhole was observed on the surface of the rubber-based adhesive.

Thereafter, a rubber as coating water-proof material (for example, Polyascoat 2 (trade name, manufactured by Shizuoka Bituminous Industry Co., Ltd.)) that was heated and melted was applied onto the rubber as-based adhesive.
A waterproof layer can be installed that adheres strongly to concrete and has excellent mechanical strength.

(Example 5) In terms of volume ratio, cement (super-rapid hardening cement, Sumitomo Osaka Cement Co., Ltd., trade name: Jet Cement), No. 6 silica sand, SBR emulsion (for example, product of Nippon Synthetic Rubber Co., Ltd.) A mixture of 0.15 and 0.6 in water was quickly stirred, poured into a mold, and leveled with a trowel.

Immediately thereafter, a rubber as-based coating waterproofing material heated and melted at about 200 ° C. (for example, manufactured by Shizuoka Bituminous Industry Co., Ltd.)
Product name Polyascort 2) was applied.

After 1.5 hours, the concrete hardens, and the rubber-assist coating waterproofing material adheres strongly to the concrete. Even if it is peeled by hand, the rubber-assist coating waterproofing material cohesively breaks, and the concrete surface is damaged. Can not be exposed,
No pinholes were formed on the surface of the rubber as-coated waterproofing material.

(Example 6) Cement (ultra-fast-setting cement, Sumitomo Osaka Cement Co., Ltd., trade name: Jet Cement) of 1, volume 6 silica sand and water of 0.7 were rapidly stirred in a volume ratio. , Poured into a mold, and the surface was flattened with an iron.

Immediately thereafter, 100 to 50 parts of a rubber as emulsion (for example, Sprayion (trade name, manufactured by Nippon Synthetic Rubber Co., Ltd.)) is added to 20 to 50 parts, preferably 20 to 50 parts, of ultra-hard cement (trade name, SQ cement, manufactured by Chichibu Onoda Co., Ltd.). 30 to 40 parts, more preferably 35 parts, of the emulsion coating waterproof material obtained by mixing and stirring was applied.

After 3 hours, the concrete hardened and the emulsion coating waterproofing material adhered strongly to the concrete.

(Example 7) Cement (ultrafast cement Cement Sumitomo Osaka Cement Co., Ltd., trade name: Jet Cement) of 1, volume 6 of silica sand and water of 0.7 were mixed rapidly by volume. , Poured into a mold, and the surface was flattened with an iron.

Immediately thereafter, a synthetic rubber emulsion (for example, Neoprene (trade name, manufactured by Showa Denko DuPont)
950) 30 parts to 100 parts, preferably 40 parts to 60 parts, more preferably 50 parts, of 100 parts of ultra-rapid hardening cement (trade name: SQ cement manufactured by Chichibu Onoda Co., Ltd.), and more preferably 50 parts of emulsion coating waterproofing material. Was applied.

After 2 hours, the concrete hardened, and the emulsion coating waterproofing material adhered strongly to the concrete, and was passed over a truck vehicle over the emulsion coating waterproofing material. No damage was seen.

(Example 8) In a volume ratio, cement (ultra-hardened cement, jet cement manufactured by Sumitomo Osaka Cement Co., Ltd.) of 1, silica sand of No. 6 and water of 0.7 were rapidly stirred. , Poured into a mold, and the surface was flattened with an iron.

Immediately thereafter, a synthetic rubber-based solvent-type coating film waterproofing material (for example, Prime M, manufactured by Shizuoka Bituminous Industry Co., Ltd.) was applied.

After two minutes, the concrete hardened, and the synthetic rubber-based solvent type waterproof coating material adhered strongly to the concrete. After the synthetic rubber-based solvent-type waterproof film was dried, it was passed through a truck vehicle over the synthetic rubber-based solvent-type waterproof film material. However, no damage was found on the emulsion paint waterproof material.

[0052]

Since the present invention is configured as described above, it has the following effects.

In the waterproofing method of the present invention,
A concrete layer is formed by spraying and driving concrete, and before the concrete setting of the concrete layer starts, a coating-based waterproofing material is brought into contact with the concrete layer, and the coating-based waterproofing material is placed on the concrete layer. Since the waterproof layer is formed of a material, the concrete layer and the waterproof layer are strongly adhered to each other, and the waterproof treatment can be performed in a short period of time without waiting for the concrete to harden.

[0054]

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-54-133721 (JP, A) JP-A-2-292448 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E04B 1/66 E01D 19/08

Claims (2)

(57) [Claims] 1. A concrete layer is formed on a construction surface by spraying and driving concrete, and before the cement of the concrete layer starts to set, a waterproof coating material is brought into contact with the concrete layer to form a concrete layer. A waterproofing method, wherein a waterproofing layer made of the coating film-based waterproofing material is formed on the layer. 2. The coating film-based waterproofing material is a modified asphalt coating film-based waterproofing material, a rubber assembling adhesive, a rubber assulating coating waterproofing material, a rubber as emulsion, a synthetic rubber emulsion, a synthetic rubber-based solvent-type coating waterproofing material. The waterproofing method according to claim 1, wherein the waterproofing method is any one of the following.