JPH04336206A - Lining material for concrete mold frame and spreading method thereof - Google Patents

Abstract

PURPOSE:To provide a lining material and spreading method thereof capable of spreading and detaching extremely simply and readily without producing any crease and sag. CONSTITUTION:The lining material for a concrete mold frame of the present invention is characterized having spreading molten holes 2 on the peripheries of a water permeable sheet. Also, the spreading method of a lining material for the concrete mold frame of this invention is characterized such that when the water permeable sheet having spreading molten holes 2 on the peripheries is spread on the concrete mold frame, the sheet is folded from the surface of the mold frame to the other surface for covering it excessively, after that, connecting materials are secured to the molten holes 2 and the connecting materials are interconnected by extensible materials 5.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lining material for concrete forms that can easily produce concrete with a small number of avatars and a clean surface, and a method for spreading the same.

0002

[Prior Art] Conventionally, formwork used in concrete pouring work has often been made of iron plates or wood, and in contrast to such formwork, ordinary woven or non-woven fabrics have been used. It is also known to spread and use a lining material made of a sheet made of cloth impregnated with resin to give it smoothness.

[0003] Such lining materials are spread on the formwork by fixing it with staples or adhesives if the formwork is made of wood, or with double-sided tape, clips, or adhesive resin if the formwork is made of steel. was.

0004

[Problems to be Solved by the Invention] However, with this spreading method, wrinkles and sag easily occur in the lining material after spreading, and it takes too much time. Another disadvantage is that stapler holes remain in the formwork, and when double-sided tape is used, it is easily peeled off, easily torn or scratched when removed from the formwork, and easily stained.

[0005] As mentioned above, if the lining material has wrinkles or sag after being spread, this causes a fatal drawback in that they are transferred to the concrete surface. The present invention aims to provide a lining material that can be extremely simply and easily spread without wrinkles or sagging, and that can be easily removed and removed, as well as a method for spreading the same.

[0006]

[Means for Solving the Problems] In order to solve the above problems, the present invention has the following configuration. That is, the lining material for concrete formwork of the present invention is characterized by having melt holes for spreading at the peripheral edge of the water-permeable sheet. Furthermore, in the method for spreading a lining material for concrete formwork of the present invention, when spreading a water-permeable sheet having melt holes for spreading on the peripheral edge to a concrete formwork, the sheet is folded from the surface of the frame body to the back side. After over-covering the melted hole, an engaging member is attached to the melted hole, and these engaging members are connected by an elastic member.

[0007]

[Function] The present invention makes the spreading work extremely simple and easy by using a material with specific holes as the lining material to be spread on the formwork when pouring concrete.
In addition, wrinkles and sagging in the lining material can be easily adjusted with simple operations, so scratches and dirt are unlikely to stick to the frame or sheet when removing it from the formwork, and the surface of the concrete is beautiful. could be produced extremely easily.

[0008] Such a lining material for concrete formwork cannot fulfill its role as a lining material for concrete formwork if it is clogged by fillers such as crushed stone particles, sand particles, and cement particles. , generally high-density fabrics are used. However, such a high-density woven fabric alone lacks the ability to drain absorbed water, so in the present invention, preferably a water-permeable sheet in which a water-permeable fabric is laminated on the high-density woven fabric is used.

The water-permeable fabric may be of either woven or knitted fabric or non-woven fabric as long as it has excellent functionality, but non-woven fabric is preferably used in the present invention.

[0010] The above-mentioned high-density fabric is preferably 1
A material having a mesh size of 0 to 200μ, more preferably 30 to 100μ is used to prevent clogging. Such a high-density fabric has a function as a filter.

[0011] Here, the mesh refers to the size of the voids formed by the weave of the fabric, and this size is determined by measuring the total length around the void, and dividing it by half the length. The value represented by is expressed as the average value of n=20. If the mesh size is less than 10μ, the weave density is too high and water permeability is poor, making it impossible to control pinholes and avatars that occur on the concrete surface.If the mesh size exceeds 200μ, the weave density is too low. This makes it difficult to prevent sand particles and cement particles from flowing out.

[0012] Such a high-density fabric may be made of synthetic fibers, but preferably one made of hydrophobic fiber material improves degassing and drainage properties, and also improves the lining material's properties. It may have excellent releasability from concrete. As such hydrophobic fiber materials, various synthetic fibers can be used, such as polyolefin fibers made of polyethylene or polypropylene, polyacrylonitrile fibers, and polyester fibers made of polyethylene terephthalate, polytetramethylene terephthalate, etc. . Among these synthetic fibers, preferably those using filament yarns have excellent filter function.

[0013] As the weave structure of the above-mentioned high-density fabric, for example, a plain weave structure, a satin weave structure, a twill weave structure, etc. can be used, but among them, a plain weave structure is preferable from the viewpoint of filter function.

[0014] The fibers constituting such a high-density fabric preferably have a single fiber fineness of 0.1 to 5 d, more preferably 0.5 to 3 d, and a total fineness of 2 d.
It is preferable to use yarns having a diameter of 0 to 200D, more preferably 50 to 100D.

Next, the water-permeable fabric described above is a high-density fabric (
It has a water passage function to discharge water absorbed by the filter layer). This water-permeable fabric is preferably composed of a fabric having an apparent fiber density in the range of 0.1 to 0.5 g/cm<3>, particularly preferably a nonwoven fabric. When the apparent fiber density is out of the above range, water permeability tends to be poor.

[0016] This water-permeable fabric is also preferably composed of hydrophobic fibers in the same manner as the above-mentioned high-density fabric from the viewpoint of water permeability (including degassing properties). Among such water-permeable fabrics, nonwoven fabrics having an air permeability of 0.5 cc/cm2/sec or more in the cross-sectional direction are preferred because they have excellent degassing properties. This ventilation amount is expressed as a value measured according to JIS L-1096. If the ventilation rate is less than 0.5 cc/cm2/sec, avatar tends to occur more easily.

Furthermore, the fibers constituting the water permeable fabric preferably have a single filament fineness of 5 to 20 d, more preferably 5 to 15 d, and can easily form the above-mentioned apparent fiber density. , and may also have excellent water permeability. The fibers constituting such a water-permeable fabric may be staples or filaments, but filaments preferably have excellent water-permeability. If the water-permeable fabric is further composed of a nonwoven fabric in which constituent fibers are oriented substantially in one direction (particularly in the vertical direction of the mold), water permeability (drainage function) is further improved.

As a means for forming the water permeable sheet which is the lining material of the present invention, for example, sewing or joining using an adhesive can be used, but partial adhesion using an adhesive is simple and preferred. Among such partial adhesion, point adhesion is preferred from the viewpoint of degassing and drainage of excess water. Such point adhesion may be formed by a gravure coating method or a dot rolling method at intervals of preferably 10 mesh or more, more preferably 20 to 100 mesh, for excellent water permeability and water permeability.

[0019] The adhesive resin used for such adhesion is as follows:
Various resins such as urethane resins, polyester resins, acrylic resins, epoxy resins, and rubber adhesives can be used as appropriate, but in any case, those with good water resistance are preferred.

The lining material of the present invention preferably has a water permeability coefficient of 1×10 −4 cm/sec or more in the cross-sectional direction, 1
It is preferable that the speed be within the range of less than ×10 −2 cm/sec. Here, the hydraulic conductivity is a value measured according to JIS A-1218. If the lining material has a water permeability coefficient of 1 x 10-2 cm/sec or more, cement particles will pass through along with excess water, making it difficult to effectively improve the strength of the concrete surface and causing clogging of the filter layer. There is a tendency to On the other hand, if the lining material has a water permeability coefficient of less than 1 x 10-4 cm/sec, it will be difficult to drain excess water and it will be difficult to solve pinholes and avatars.

A feature of the present invention is that melt holes are provided in the peripheral edge of the lining material made of such a water-permeable sheet. Generally, when a hole is made in a fabric, it tends to be torn from that part, and thus such a fabric has not been used as a lining material for concrete formwork in the past. Considering the tension exerted on the lining material, it is possible to use grommets to drive the material, but such eyelet work requires a lot of effort and there is a limit to the size of the eyelets, so it is difficult to use them for lining materials. It is necessary to procure a size suitable for the engagement tool, which has the disadvantage of being complicated and difficult to put into practical use.

[0022] The present inventors have found that by providing holes made by melting a water-permeable sheet as a lining material for such a concrete formwork, the concrete form is strong enough to withstand the tension during spreading, and is also easy to work with. It was discovered that a lining material that is easy to apply can be provided. That is, when the lining material is spread on the formwork, a tension of approximately 10 kg is applied, and we focused on holes drilled by melting as holes that can withstand such tension. This is because the water-permeable sheet used in the present invention, particularly preferably the laminated sheet of high-density woven fabric and non-woven fabric, has a tear strength of 10 kg/cm or more and is difficult to tear, and furthermore, the fusion hole engagement This was achieved by finding out that the material has excellent fracture resistance, with a hooking strength of 16 kg/cm or more.

According to the present invention, the water-permeable sheet can be quickly spread on a formwork by using the above-mentioned melting holes as they are without performing complicated processing such as eyelet processing or edging. It also achieves sufficient practicality.

[0024] There is no limit to the size of the melting hole, but the hole diameter is preferably 0.5 to 5.0 cm, more preferably 1 cm.
A hole with a diameter of ~3.0 cm is preferable in terms of hole strength and ease of handling. The fracture resistance of such a weld hole is related not only to the strength of the weld hole, but also to the type of engagement member attached to the weld hole. In other words, if the part of the engaging member in contact with the melting hole is subjected to external force at one point, it is likely to be torn, but if a part with a shape that can disperse the external force is used, the fracture resistance will be significantly improved. be able to.

Therefore, in the present invention, it is preferable to use an engaging member whose portion in contact with the melting hole has an engaging portion shaped so as to be able to disperse external force.

[0026] A preferred specific example of such an engaging member is a member having engaging portions provided with a hook-shaped, key-shaped, etc. hooking mechanism at both ends, and preferably contacts the melting hole at two or more points. shape, for example, a member made of a plurality of wires, a member made of a steel material having a circular or polygonal cross section, and more preferably at least 1/10, and even 1/5 of the circumference of the melting hole. It is preferable to have an engaging portion having a shape that touches the above length.

[0027] The materials constituting this engaging member include:
Any material can be used as long as it has a certain degree of rigidity, such as wood materials, metal materials, plastic materials, etc.

The elastic member of the present invention is used by being engaged with such an engaging member. That is, the elastic member is used to spread the lining material onto the surface of the concrete form without wrinkles or sagging, and adjusts the tension of the material to correct wrinkles or sag. .

[0029] Such a stretchable member is made of an elastic material,
For example, a stretchable resin material such as rubber or elastomer, or a material having a metal spring mechanism can be used. The shapes of such members include fibrous,
It is not limited to any shape as long as it can perform its function, such as a string shape or even a rod shape, but a string shape is preferable because it is easy to handle in practical terms.

Next, an example of the lining material for concrete formwork of the present invention will be explained with reference to the drawings.

FIG. 1 is a plan view showing an example of the lining material for concrete formwork of the present invention.

The lining material 1 shown in FIG. 1 is a laminated sheet in which a high-density fabric and a water-permeable fabric (non-woven fabric) are dot-bonded with an adhesive. Melting holes 2 are provided in the periphery of this lining material 1. In this figure, a plurality of melting holes 2 are provided in a row along the periphery, but there are no particular restrictions on the position of the holes or the number of melting holes, and they may be located near the periphery, and they may be arranged in a zigzag pattern. It is okay to set it up. As shown in FIG. 2, the lining material 1 of the present invention is used to cover a concrete formwork 3, and the lining material 1 is preferably bent from the front side of the formwork 3 to the back side. The frame 3 is covered with an excess of about 1 to 10 cm, more preferably about 3 to 5 cm. It is preferable from the viewpoint of workability that the above-mentioned melting hole 2 be present in this surplus portion. Therefore, the position where the above-mentioned melting hole is provided is
Although it is a peripheral portion of the lining material 1, it is preferably within the range of such surplus portion.

FIG. 2 shows the concrete lining material 1 of the present invention.
FIG. 3 is a schematic diagram showing the state of the back side when the formwork 3 is covered and spread. As shown in the figure, an engaging member 4 is attached to the melting hole 2, and this engaging member 4 further includes an elastic member 5.
, and the lining material 1 is spread out. In this case, the elastic member 5 is engaged with the engaging member 4 that is present on the substantially opposite or diagonal surface, and the tension of the elastic member 5 is adjusted to move the lining material 1 onto the surface of the frame 3. It fits and spreads without wrinkles or sagging.

FIG. 3 is a sectional view showing the state in which the lining material 1 is spread on the formwork 3. As shown in FIG.

The lining material 1 shown in the figure covers the frame 3 with the high-density fabric 7 side facing outward and the water-permeable fabric 6 side facing inward.
An engaging member 4 is engaged with a melting hole 2 provided at the periphery of the surplus portion of the lining material 1 bent at the end of the frame body 3. The stretched state of the surface of the frame body 2 is adjusted by the elastic member 5.

In this way, the concrete formwork 3 on which the lining material 1 is spread has air bubbles and excess water flowing from the high-density fabric layer 7 of the lining material 1 to the water-permeable fabric layer 6 due to the lateral pressure of the poured concrete. It is extruded, passes through this water-permeable fabric layer 6, and is discharged from the end of the excess water-permeable fabric on the back side.

[0037]

[Example] The present invention will be further explained by giving examples.

Example 1, Comparative Examples 1 and 2 The mesh size is 150μ or less and the permeability coefficient is 1.6×10-3c.
m/sec, fabric weight 60 g/m2, longitudinal density 118 pieces/
inch, high-density taffeta with a lateral density of 90 fibers/inch and an apparent fiber density of 0.3 g/cm3 and a basis weight of 100 g/inch.
A water-permeable laminate sheet was prepared by laminating spunbond nonwoven fabrics made of m2 polyester filaments by spot-bonding them with a urethane adhesive. This sheet is 110 x 200 (
cm), and a soldering iron was applied from the nonwoven fabric side to form a melting hole with a hole diameter of about 1 cm centered at 2.5 cm from the periphery to obtain a lining material (Example 1).

For comparison, a sheet made only of the above-mentioned high-density taffeta with X-shaped cuts made instead of melted holes (Comparative Example 1), and a sheet with holes of the same size as in Example 1 made with dumbbells. Two types of lining materials, one formed by punching (Comparative Example 2), were prepared.

When these lining materials were subjected to a hooking test using a round rod-shaped engaging member, the following results were obtained.

Example 1: 16.5 Kg/cm Comparative Example 1: 8.5 Kg/cm Comparative Example 2: 9.0 Kg/cm The thus obtained lining material was sized to have a length of 180 cm and a width of 90 cm.
As shown in Figure 2, three types of concrete formwork were created by spreading the concrete formwork onto commercially available concrete formwork plywood with a thickness of 1.25cm.

When concrete was poured into these molds and evaluated, it was found that the molds of Example 1 had a beautiful concrete surface, but the molds of Comparative Examples 1 and 2 had a beautiful concrete surface after spreading. The sheet was destroyed and the engaging member came off, resulting in wrinkled concrete on the surface of the lining material.

[0043]

[Effects of the Invention] The present invention can provide a lining material that allows concrete formwork to be formed extremely simply and easily, and further provides a method that can quickly spread the lining material without wrinkles or sag. be able to.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an example of the lining material for concrete formwork of the present invention.

FIG. 2 is a schematic diagram showing the state of the back side when the formwork is covered and spread with the concrete lining material of the present invention.

FIG. 3 is a sectional view showing a state in which the lining material is spread on the formwork.

[Explanation of symbols]

1: Lining material 2: Melting hole 3: Frame body 4: Engagement member 5: Elastic member 6: Water-permeable fabric 7: High-density fabric

Claims (5)

[Claims] 1. A lining material for concrete formwork, characterized by having melt holes for spreading on the peripheral edge of a water-permeable sheet. 2. The lining material for concrete formwork according to claim 1, wherein the water-permeable sheet comprises a high-density woven fabric and a non-woven fabric. 3. The lining material for concrete formwork according to claim 1, wherein the water-permeable sheet is made by partially adhering a high-density woven fabric and a non-woven fabric. 4. When spreading a water-permeable sheet having melting holes for spreading on the periphery to a concrete formwork, the sheet is folded from the surface of the frame to the back side to cover the excess, and then A method for spreading a lining material for concrete formwork, comprising: attaching engaging members and connecting these engaging members with an elastic member. 5. The method for spreading a lining material for concrete formwork according to claim 4, wherein the stretchable member is made of an elastic material.