JP2849542B2 - Method of manufacturing waterproof form for PC formwork - 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 for manufacturing a water-resistant stamped PC plate formwork.

[0002]

2. Description of the Related Art As one method of waterproofing an underground wall, for example, as shown in Japanese Patent Application Laid-Open No. 3-275865, a continuous water-absorbing agent such as bentonite or urethane-based water-absorbing resin is filled inside open cells of open-cell concrete. A waterproofing method using this as an outer formwork for placing concrete has been proposed.

In this method, an outer formwork is placed on the ground side, cast-in-place concrete is poured into a casting space formed between the outer formwork and the inner formwork, and after hardening, the inner formwork is cast. Is removed to form an underground wall integrated with the outer formwork.When water penetrates from the ground side, the water-absorbing swelling agent filled in the open cells absorbs and swells. To prevent the intrusion of water and ensure the waterproofness of the underground wall.

[0004]

However, in the case of the outer mold, a water-absorbing swelling agent must be filled after the production of the open-cell concrete slab, and the workability is poor. In other words, the filling operation has to apply vibration while sprinkling a powdery water-absorbing swelling agent after the production of the concrete plate to flow down the inside of the porous material, and it takes time and effort to completely fill the porous plate.

[0005] Further, since the outer mold frame itself does not have water blocking properties, there is a fear that the waterproofness may be extremely reduced when the water-absorbing swelling agent is dissipated or insufficiently filled.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a method of manufacturing a water-resistant typed-in PC frame which can easily integrate such a swellable waterproof material. To provide.

[0007]

In order to achieve the above object, the invention according to claim 1 is to provide a swelling waterproofing material mainly composed of bentonite when the concrete constituting the waterproof-type cast-in PC plate is not cured. It is sprayed on the concrete surface and is evenly applied.

[0008] The invention according to claim 2 is that a sheet-like material containing bentonite is pasted on an inner surface of a mold for forming a PC plate mold, and concrete is poured into the mold. The present invention is characterized in that a PC plate form having a swellable waterproof material integrated on its surface is manufactured.

[0009]

According to the above construction, the swellable waterproofing material can be integrated with the surface of the stamping mold simultaneously with the molding. By placing the swelling waterproofing material on the concrete casting surface side, the swelling waterproofing material will be interposed between this and the cast-in-place concrete in addition to the water stoppage of the driving formwork itself. Water that penetrates through cracks in concrete or driven formwork is taken up by the waterproofing material and its water-absorbing swelling action prevents water from entering.

[0010] In the case of the constitution of claim 2, even when the swellable waterproofing material cannot be directly applied to the surface of the PC plate, the same function and effect can be obtained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a first embodiment of a method for manufacturing a waterproof-type stamped PC plate form 10 according to the present invention, in which concrete C is poured into a forming form 12 so that the concrete C begins to harden to some extent. In the initial stage of the reaction, a swellable waterproofing material 14 composed of bentonite alone or a mixture of bentonite and a binder is sprayed on the surface, and is evenly applied with a trowel or the like.

When the swellable waterproofing material 14 is bentonite alone, the cement component in the concrete C functions as a binder when applied to the concrete surface, but when the applied thickness is large, the cement component in the concrete C is mixed with another binder. There is a risk of causing more harmful cracks than that of concrete, and in consideration of the compatibility with the surface layer of concrete C, a maximum of about 1 mm
It is constructed to have a thickness of the order.

When the bentonite and the binder are mixed, the binder includes various polymers that can be emulsified, such as natural or artificial rubber and other polymers. Examples of the artificial rubber include polybutadiene, SBR, SBR, ABR, 2-divinylpyridine-styrene-butadiene, chloroprene, isoprene and the like.

Other polymers that can be emulsified include polystyrene, polyethylene, polyvinyl chloride copolymer, vinylidene chloride polymer, acrylate polymer, polyvinyl acetate, vinyl acetate copolymer, and bi-ethylene acetate. Various resins such as a copolymer, an acrylate-styrene polymer, a polyurethane and an epoxy are listed. The mixing ratio between the bentonite and the polymer is such that the solid content is 20%.
A mixture obtained by mixing and kneading 15 to 120 parts by weight of bentonite with respect to 100 parts by weight of the polymer emulsion of about 70% may be used.

After the application operation is completed and the concrete C is cured, the concrete C is removed from the molding mold 12 to complete the punched-in PC mold 10 having a swellable waterproof material integrated on the surface.

This form 10 for driving PC can be used as either an inner form or an outer form. However, when used as an inner form of an underground wall as shown in FIG.
0 is arranged so as to form a predetermined casting space a between the retaining wall 16 and the waterproofing material 14 facing the space a. And hardening of this, cast-in-place concrete 18
Completes the underground wall integrated with the driving form 10 via the layer of the swellable waterproofing material 14.

After completion, the concrete 18 is cracked, and water penetrates through the cracks of the concrete 18 from the retaining wall 16 side and is taken into the waterproofing material 14,
The waterproofing material 14 swells in the plane and out of the plane by absorbing the water, and the swelling pressure prevents the water from entering the driving form 10 as an inner wall. The driving form 10 also functions as a water stop wall.

Since the driven formwork 10 is left as it is as the inner wall, in this construction example, the work of removing the formwork is unnecessary, and the workability is improved.

When the driving form 10 is used as an outer form, as shown in FIG. 3, the driving form 10 is arranged along the wall surface of the ground 20 and an inner form made of plywood or the like. 22 is assembled via a separator 24 to form a casting space a between the two. Of course, the swellable waterproofing material 14 faces the casting space a, and after the assembly, the cast-in-place concrete 18 is cast in the casting space a, and after hardening, the inner formwork 22 is removed, and the ground 20 side. If you fill the space with earth and sand,
The underground wall in which the cast-in-place concrete 18 is integrated with the driving form 10 via the layer of the swellable waterproof material 14 is completed.

In the case of this construction example, the driving form 10 functions as an outer water blocking wall in contact with the ground 20, and the water permeating therethrough is absorbed by the swellable waterproofing material 14 and swelled by the poured concrete 18. Side penetration is prevented.

FIGS. 4A to 4C show a second embodiment applied to a case where a swellable waterproofing material cannot be applied to the PC plate surface. The molding form 30 of the PC plate is composed of an inner form 30a having a rectangular shape and an outer form 30b larger than this, and concrete is placed in a space surrounded between the forms 30a and 30b. The molding 3 in a square shape by casting
At the same time as forming the molded article 1, a layer of a swellable waterproof material is formed on the inner surface side of the molded body 31.

FIG. 4 (a) shows in advance the surface of the inner mold 30a.
As shown in FIG. 7, after the impregnated sheet 32 of a nonwoven fabric or the like containing a swellable waterproofing material mainly composed of bentonite is adhered, it is set on the outer mold 30b. Next, as shown in FIG. 4 (b), the concrete C is poured into the interior surrounded by both the molds 30a and 30b, so that the swellable waterproofing material contained in the impregnated sheet 32 together with the impregnated sheet 32 It is transferred to the surface layer of concrete C. Therefore, both formwork 3
After releasing the molds 0a and 30b, as shown in FIG. 4 (c), an injection PC plate form 33 in which an impregnated sheet 32 containing a swellable waterproof material is integrally molded inside a square shaped molded body 31. Is obtained.

The driving PC plate form 33 is, for example, shown in FIG.
It is used as a waterproof type driving PC plate form of sewage squid as shown in the following.

That is, the outer shape of the PC plate form 33 is obtained by using the driven PC form 33 as an outer form, arranging the cylindrical form 34 inside, and then placing concrete C between them. A waterproof sewer 35 having a cylindrical opening inside the rectangular shape is completed.

An impregnated sheet 32 containing a swellable waterproof material is interposed between the surface of the completed sewage tank 35 and the molded body 31 in a sandwich state. First, the permeation of water from the surrounding ground in which the pit 35 is buried is prevented.

The present invention is, of course, applicable to the general manufacture of a punched-in PC formwork adapted to the shape of the waterproof structure in addition to the above embodiment.

[0027]

As described in detail in the above embodiments, in the method of manufacturing the water-resistant stamped PC plate form according to the present invention, the surface of the form is swelled simultaneously with the molding of the form. Since the waterproofing material can be integrated, there is an advantage that manufacturing is easy.

In addition, when laying a swellable waterproofing material on the side of the cast-in-place concrete during the construction of the underground wall using the form-in-placed formwork, in addition to the water-blocking property of the form-in-place formwork itself, The swelling waterproofing material is interposed between the water and the water that enters through the cracks in the cast-in-place concrete or the cast-in formwork is taken into the waterproofing material, and the water absorption and swelling action of the waterproofing material prevents water from entering. Therefore, since the waterproofing is performed by the three-layer structure of the driving form, the waterproof material and the cast-in-place concrete, a high waterproofing effect can be obtained.

Furthermore, when the method according to claim 2 is employed, even if the surface of the PC plate to be obtained has a complicated shape in which the swellable waterproofing material cannot be directly applied, a driving PC plate having this kind of waterproof structure is provided. Can be manufactured, and there is an advantage that it can be applied to waterproof structures of various shapes.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view showing a method of manufacturing a waterproof type PC driving formwork according to a first embodiment of the invention method.

FIG. 2 is a sectional view showing an example of construction of an underground wall using the driving form as the inner form.

FIG. 3 is a cross-sectional view showing a construction example of an underground wall using the driving formwork as an outer formwork.

FIGS. 4 (a) to 4 (c) are explanatory views showing a method of manufacturing a waterproof type PC plate driving formwork according to a second embodiment of the present invention.

FIG. 5 is a cross-sectional perspective view showing a construction example of a sewage basin using the PC-plate driving formwork.

[Explanation of symbols]

 10,23 Driving PC formwork 14 Swellable waterproofing material 16 Retaining wall 18 Cast-in-place concrete 20 Ground pile 32 Impregnated sheet containing swelling waterproofing material 35 Waterproof type sewer C concrete

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Miki Aoyama 4-640 Shimoseito, Kiyose-shi, Tokyo Co., Ltd. Inside Obayashi Corporation Technical Research Institute (72) Inventor Yoshimasa Hayashi 4-640 Shimoseito, Kiyose-shi, Tokyo Co., Ltd. Obayashi Technical Research Institute (72) Inventor Haruka Ogawa 4-640 Shimoseito, Kiyose-shi, Tokyo Co., Ltd.Obayashi Gumi Technical Research Laboratories (72) Inventor Ichiya Mitani 4-640 Shimoseito, Kiyose-shi, Tokyo Co., Ltd. Inside the laboratory (72) Inventor Etsunori Tamura 4-640 Shimoseito, Kiyose-shi, Tokyo Inside the Obayashi Corporation Technical Research Institute (72) Inventor Hideo Okamoto 2-3-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo head office (72) Inventor Junichi Kawahara 2-3-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo head office (56) Bibliography Patent Sho 62-276128 (JP, A) JP flat 3-295978 (JP, A) JP Akira 58-26123 (JP, A) (58 ) investigated the field (Int.Cl. ^6, DB name ) E02D 31/02

Claims (2)

(57) [Claims] 1. A waterproof type driving, characterized in that a swellable waterproofing material mainly composed of bentonite is sprayed on the surface of the concrete when the concrete constituting the waterproof type PC plate is not cured, and is uniformly applied. Manufacturing method of PC plate formwork. 2. A swellable waterproof material is integrally formed on a surface of a mold for forming a PC plate mold by pasting a sheet-like material containing bentonite in advance on the inner surface of the mold and forming concrete in the mold. A method for producing a waterproof-type, driven PC plate form, characterized by producing a simplified PC form form.