JP2020139389A - Frame mold material for vertical construction joint of concrete and frame mold material for vertical construction joint using the same - Google Patents

Abstract

To provide a frame mold material for a vertical construction joint of concrete capable of discharging an air bubble or bleeding water reliably on construction of concrete.SOLUTION: In the frame mold material 1 for a vertical construction joint of concrete formed by a number of convex projections 3, 3, ... in a regular array projecting on one surface side of a sheet material 2 by an embossment process on the sheet material 2 in synthetic resin, a pore 3a is formed relative to the convex projections 3 and non-woven fabric 4 is adhered on other surface side of the sheet material 2. The convex protrusion 3 is in a truncated cone shape or pyramid trapezoidal shape and arranged in a positive grid array or a zigzag grid array.SELECTED DRAWING: Figure 4

Description

The present invention relates to a formwork material for vertical seams used when a vertical seams occur in a concrete placing process in the construction of various concrete structures, and a formwork for vertical seams using the same.

Conventionally, in the construction of various concrete structures, vertical seams of old and new concrete may occur during the concrete placing process. At the vertical joint of this concrete, processing is performed to integrate the old and new concrete. For example, the surface of the vertical joint of hardened old concrete is scraped with a wire brush, or the surface is roughened by chipping, etc., and after sufficient water absorption is made at the joint, new concrete is poured to bring the old and new concrete into close contact. The method is to apply a solidification delay material to the inner surface of the old concrete joint formwork to cast concrete, and after demolding, high-pressure water is sprayed at the joint to make the cement particles in the old concrete unwater. After exposing the aggregate of the old concrete by washing away the Japanese part, a method of placing new concrete was used.

However, since these methods are basically manual work, a lot of labor, labor and time are required. Therefore, in recent years, a synthetic resin sheet material having a large number of convex protrusions is attached to the inner surface of the formwork to cast concrete, and a plurality of irregularities are formed at the vertical joints of the hardened old concrete. A method has been proposed in which the old and new concretes are integrated by the same meshing.

For example, in Patent Document 1 below, a sheet material made of a synthetic resin that forms a large number of independent convex protrusions by embossing, and is cured of a material that can maintain a convex shape with respect to the acting concrete lateral pressure. Formwork material for concrete vertical joints used to form recesses in the vertical joints of old concrete.

Further, in Patent Document 2 below, a sheet material made of synthetic resin that forms unevenness by embossing is pasted on a dam plate of a joint formwork to cast concrete, and unevenness is formed in the vertical joint of hardened old concrete. In the formwork material for the vertical joint of concrete forming a portion, in the sheet material, the quadrangular pyramid pedestals that are continuous in a grid pattern form the unevenness, and the concave portions of the adjacent quadrangular pyramid pedestals are straight. The top flat side of the quadrangular pyramid is attached to the dam plate and concrete is poured to form a quadrangular formwork-shaped convex part and a grid-like concave part at the vertical joint of the hardened old concrete. Formwork materials for vertical concrete joints are disclosed.

Japanese Unexamined Patent Publication No. 2001-182322 JP-A-2018-87475

In the formwork material for vertical seams described above, the discharge of air bubbles and breathing water generated by concrete placing becomes a problem. Therefore, in Patent Document 1, the truncated cone shape in which the inclination angle θ of the convex protrusion is 70 to 75 ° makes it easy for air bubbles generated during concrete placement to move. Further, in Patent Document 2, adjacent square truncated cone recesses are brought into contact with each other on a line, and the shape does not have a flat portion so that air bubbles and breathing water are less likely to accumulate and are quickly discharged to the outside. There is.

However, in the case of these vertical seam formwork materials, the discharge path of air bubbles and breathing water is not clearly formed, and the discharge path is obstructed by the placed concrete. There were problems such as insufficient discharge of breathing water.

Therefore, a main object of the present invention is to provide a formwork material for vertical joints of concrete capable of reliably discharging air bubbles and breathing water during concrete placement, and a formwork for vertical joints using the same. ..

In order to solve the above problems, as the present invention according to claim 1, concrete in which a large number of convex protrusions protruding on one side of the sheet material are formed in a regular arrangement by embossing on the sheet material made of synthetic resin. Formwork material for vertical seams
Provided is a formwork material for vertical joints of concrete, characterized in that pores are formed in the convex protrusions and a non-woven fabric is attached to the other surface side of the sheet material.

According to the first aspect of the present invention, pores are formed in the convex protrusions formed on the synthetic resin sheet material, and the non-woven fabric is attached to the other surface side of the sheet material. There is. Therefore, when concrete is cast with the non-woven fabric surface of the formwork material for vertical joints attached to the concrete casting surface side of the formwork, air bubbles and breathing water generated from the concrete are projected from the pores. It flows out into the internal space of the formwork, and then is absorbed inside the non-woven fabric or discharged to the outside through the fiber space of the non-woven fabric. In this way, the drainage path of the bubbles and breathing water generated from the concrete is clearly formed, so that the bubbles and breathing water can be reliably discharged.

According to the second aspect of the present invention, the convex protrusions are arranged in a regular lattice arrangement or a staggered lattice arrangement, according to claim 1, a formwork material for vertical joints of concrete, and vertical joints using the same. Formwork is provided.

The invention according to claim 2 specifically shows the regular arrangement of the convex protrusions. It is desirable that the convex protrusions are arranged in a regular lattice arrangement or a houndstooth arrangement.

As the present invention according to claim 3, the formwork material for vertical seam of concrete according to any one of claims 1 and 2 in which the convex protrusion has a truncated cone shape or a truncated cone shape is provided.

The invention according to claim 3 specifically shows the shape of the convex protrusion. It is desirable that the convex protrusion has a truncated cone shape or a truncated pyramid shape.

According to the fourth aspect of the present invention, the formwork material for vertical seam of concrete according to any one of claims 1 to 3, wherein the pores are formed on both the top surface and the wall surface of the convex protrusion. Provided.

The invention according to claim 3 specifically shows the mode of forming pores in the convex protrusions. Considering the discharge efficiency of air bubbles and breathing water, it is desirable that the pores are formed on both the top surface and the wall surface of the convex protrusion.

The present invention according to claim 5 is characterized in that the non-woven surface of the formwork material for vertical joints of concrete according to any one of claims 1 to 5 is attached to the concrete casting surface side of the formwork. Formwork for vertical seams of concrete to be provided.

The invention according to claim 5 is a formwork for vertical joints using the formwork material for vertical joints of concrete. The two are combined by pasting the non-woven fabric surface of the formwork material for vertical joints of concrete on the concrete casting surface side of the formwork board.

As described in detail above, according to the present invention, there is provided a formwork material for vertical joints of concrete capable of reliably discharging air bubbles and breathing water at the time of placing concrete, and a formwork for vertical joints using the same. it can.

It is a front view of the main part of the formwork material 1 for the vertical joint of concrete. It is the vertical cross-sectional view (the arrow view of line II-II of FIG. 1). It is an enlarged cross-sectional view of the convex protrusion 3. This is the concrete placement procedure (1). This is the concrete placement procedure (Part 2). This is the concrete placing procedure (3). It is a front view of the main part of the formwork material 1 for a vertical seam which shows another example of the regular arrangement of the convex protrusions 3. It is a front view of the main part of the formwork material 1 for a vertical seam which shows another example of a pore arrangement.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, a large number of concrete formwork materials 1 for vertical joints according to the present invention are embossed on a synthetic resin sheet material 2 so as to project to one side of the sheet material 2. The convex protrusions 3, 3 ... Of the above are formed in a regular arrangement, and pores 3a, 3a ... Are formed in the convex protrusions 3, 3 ... The non-woven fabric 4 is pasted on the direction side.

Hereinafter, the details will be described in more detail.

The formwork material 1 for the vertical seam is made of a sheet material made of synthetic resin. It is desired that the sheet material 2 has rigidity such that it has sufficient deformation resistance performance and strength characteristics against concrete pressure at the time of concrete placement, and is inexpensive and lightweight. As such a material, various resins such as olefin resins such as polyethylene and polypropylene, vinyl chloride, acrylic resins, ABS resins, phenol resins, nylon and polycarbonate resins can be used, and among these, polyethylene, polypropylene and the like can be used. The olefin-based resin is suitable in terms of strength characteristics, low cost, and light weight. Further, for the purpose of increasing the rigidity, a filler, glass fiber, aramid fiber, carbon fiber or the like may be internally added. As the filler, talc, calcium carbonate and the like are preferable in consideration of cost and handleability. Further, in addition to the filler, functional additives such as an antioxidant, an ultraviolet absorber, and a flame retardant may be mixed.

With respect to the synthetic resin sheet material 2, a large number of convex protrusions 3, 3 ... Protruding on one side of the sheet material 2 by embossing are formed in a regular arrangement. In order to form the convex protrusions 3, 3 ... On the sheet material 2, unevenness is formed on the roll surface in a state where the sheet material 2 is heated to a predetermined temperature, and the unevenness is configured to mesh with each other. By passing the sheet material 2 between the pair of embossed rolls, a large number of convex protrusions 3, 3 ... Protruding on one side of the sheet material 2 can be formed.

The shape of the convex protrusion 3 is a truncated cone shape, and is composed of a top surface 3A and a wall surface 3B. As shown in FIG. 3, the shape dimensions are as follows: the diameter φ1 of the top surface 3A is 1.5 to 20 mm, the diameter φ2 at the base surface 3C is 3 to 30 mm, the height h is 5 to 20 mm, and the adjacent convex protrusions. It is desirable that the center distance P from 3 is 15 to 40 mm. The inclination angle θ of the wall surface 3B is preferably 50 to 90 °, preferably 60 to 75 °. In any case, it is important that the convex protrusion 3 has a pressure-resistant deformation performance that does not significantly deform when concrete is cast, and that a sufficiently uneven surface can be formed on the concrete joint surface. .. The thickness t of the sheet material 2 is preferably about 0.2 to 2.0 mm, preferably about 0.5 to 1.5 mm.

It is desirable that the base surface 3C other than the forming portion of the convex protrusion 3 is a flat portion. Since the base surface 3C is a flat portion, the non-woven fabric 4 described later can be stably attached, and the non-woven fabric 4 described later can be stably attached to the mold plate.

Pore 3a is formed in the convex protrusion 3. The pores 3a are holes for allowing air bubbles and breathing water generated during concrete placement to flow out into the internal space of the convex protrusions 3. Therefore, the diameter of the pores 3a should be such that air and breathing water can pass through but concrete is difficult to be discharged. Specifically, it is preferably about 0.1 to 1.5 mm and 0.5 to 1.0 mm.

In order to form pores 3a in the convex protrusions 3, a method of forming pores 3a at the same time as embossing by providing a needle for the unevenness of the embossing roll when embossing is performed, or embossing roll is performed. In the previous stage of passing, the pores 3a may be formed by pressing a pressing plate on which a large number of needles are projected at predetermined positions against the flat sheet material 2, and then the pores 3a may be formed by embossing or the like. it can.

It is desirable that at least one or more pores 3a are formed in the pores 3a for each convex protrusion 3, but pores 3a are not necessarily formed for all of the convex protrusions 3. There is no need. However, considering the discharge efficiency of air bubbles and breathing water, it is desirable that the pores 3a are formed on both the top surface 3A and the wall surface 3B of each convex protrusion 3 as shown in the figure. In particular, it is desirable to form a plurality of the wall surface 3B. In the illustrated example, three pieces are formed for each row in the cross direction in a plan view with respect to the wall surface 3B.

On the other hand, the non-woven fabric 4 is attached to the other surface side of the sheet material 2. The material fibers constituting the non-woven fabric 4 can be olefin-based fibers such as polyethylene or polypropylene, synthetic fibers such as polyester-based and polyamide-based, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A non-woven fabric obtained by an appropriate processing method such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, or a needle punching method can be used. Among these processing methods, the spunbond method, the melt blown method, and the like have a three-dimensional network structure with long fibers, and are desirable because they have strength and easily form a flow path for discharging air bubbles and breathing water. Further, the thermal bond method is desirable because it is bulky and has high compression stability. It is desirable to use a basis weight of about 100 to 600 g / m ² , preferably about 200 to 500 g / m ² . When the material fiber is a synthetic fiber, the material itself has hydrophobicity. The non-woven fabric may be used as it is hydrophobic, or the fibers may be surface-treated with a hydrophilic agent to impart hydrophilicity.

As the non-woven fabric 4, an air raid pulp non-woven fabric having absorbency in the fiber itself can also be used. This air-laid pulp non-woven fabric is webbed by an air-laid method in which pulp fibers of a predetermined length are defibrated, carried on an air stream, passed through a wire mesh or a screen having pores, and then dropped and deposited on a wire mesh. Is formed, and the intersections of the fibers in the web are heat-sealed with binder fibers, or the fiber intersections are bonded with an emulsion binder to form a sheet-like non-woven fabric. It is a non-woven fabric that is generally distributed as a paper towel. As the fibers constituting the air raid pulp non-woven fabric, in addition to the pulp fibers, short fibers of thermoplastic fibers may be mixed in order to increase the bulkiness and compression restoration property. Examples of the thermoplastic fiber include polypropylene, low-density polyethylene, linear low-density polyethylene, olefins such as a crystalline propylene copolymer composed of propylene and α-olefin, polyamides, polyethylene terephthalate, polybutylene terephthalate, and diol. Examples thereof include various synthetic fibers such as low melting point polyester copolymerized with terephthalic acid / isophthalic acid and polyesters such as polyester elastomer. Since this air-raid pulp non-woven fabric is a non-woven fabric mainly composed of pulp, the non-woven fabric itself has absorbency. Therefore, it is possible to sufficiently absorb and retain the breathing water.

Next, a method for treating the concrete joint using the formwork material 1 for the vertical joint will be described in detail.

As shown in FIG. 4, the formwork 6 for vertical joints of the present invention is installed at a partition position (vertical joints) of the concrete placing space to be constructed in advance. The vertical joint formwork 6 is a formwork having a structure in which four non-woven fabrics of the concrete vertical joint formwork material 1 described above are attached to the concrete casting surface side of the formwork plate 5. It is preferable to fix the formwork material 1 for vertical seams using a tacker or the like.

When the concrete 7 is placed in the space, as shown in FIG. 4, air bubbles and breathing water generated from the concrete 7 flow from the pores 3a, 3a ... Of the convex protrusion 3 into the internal space of the convex protrusion 3. After flowing out, it is absorbed inside the non-woven fabric 4 or discharged to the outside through the fiber space of the non-woven fabric 4.

After that, the formwork 6 for vertical joints of the formwork is removed after waiting for the concrete 7 to harden. As shown in FIG. 5, a concavo-convex surface in which concave portions 7a and convex portions 7b are alternately and regularly arranged is formed at the joint of the concrete 7.

In order to place continuous integrated concrete (new concrete 8) adjacent to concrete 7 (old concrete), as shown in FIG. 6, at a position separated from the joint of the old concrete 7 by a predetermined distance. The formwork 6 for vertical joints is installed again, sufficient water is supplied to the joints, and then new concrete 8 is placed. At the joint between the old concrete 7 and the new concrete 8, the old and new concrete can be integrated by mechanically meshing the unevenness with each other.

[Examples of other forms]
(1) In the above embodiment, the shape of the convex protrusion 3 is a truncated cone shape, but it may be a truncated cone shape.
(2) In the above embodiment, the arrangement of the convex protrusions 3 is arranged in a houndstooth pattern, but as shown in FIG. 7, it may be arranged in a regular lattice arrangement. Further, it may be arranged in a combination of houndstooth arrangement and regular lattice arrangement, or in a regular pattern other than these arrangements. In short, it is important that the convex protrusions 3, 3 ... Are uniformly scattered at a predetermined density.
(3) In the above embodiment, the pores 3a are not formed on the base surface 3C of the sheet material 2, but as shown in FIG. 8, the pores 3a are also formed on the base surface 3C of the sheet material 3. 3a ... may be formed.

1 ... Formwork material for vertical joints of concrete, 2 ... Sheet material, 3 ... Convex protrusions, 3a ... Pore, 3A ... Top surface, 3B ... Wall surface, 3C ... Base surface, 4 ... Nonwoven fabric, 5 ... Formwork Board, 6 ... Formwork for vertical seams, 7.8 ... Concrete

Claims (5)

A formwork material for vertical seams of concrete in which a large number of convex protrusions protruding from one side of the sheet material by embossing are formed in a regular arrangement on a sheet material made of synthetic resin.
A formwork material for vertical seams of concrete, characterized in that pores are formed in the convex protrusions and a non-woven fabric is attached to the other surface side of the sheet material. The formwork material for vertical seams of concrete according to claim 1, wherein the convex protrusions are arranged in a regular lattice arrangement or a houndstooth arrangement. The formwork material for vertical seams of concrete according to any one of claims 1 and 2, wherein the convex protrusions have a truncated cone shape or a truncated cone shape. The formwork material for vertical joints of concrete according to any one of claims 1 to 3, wherein the pores are formed on both the top surface and the wall surface of the convex protrusion. A concrete vertical joint formwork characterized in that the non-woven fabric surface of the concrete vertical joint formwork material according to any one of claims 1 to 4 is attached to the concrete placement surface side of the formwork plate. ..

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