JPH02132269A - Sheathing board extending sheet - Google Patents

Abstract

PURPOSE:To improve warm keeping heat insulation further facilitating release of a mold while discharging surplus water and bubbles by using a sheathing board extending sheet having a foam synthetic resin layer forming a fine protrusion in the reverse surface and providing a water circulating small hole. CONSTITUTION:By protrusively forming many quadrangular pyramid-shaped fine protrusions 4 in a foam polyethylene sheet 10 in its reverse side, many communication grooves 6, serving as a fine filtering drain path 5, are provided being grooved. Next in obverse and reverse sides of a foam synthetic resin sheet layer 1 formed by a sheet 10, polyolefin system resin film layers 20, 30 are laminated forming a sheathing board extending sheet A, and many water circulating small holes 7 penetrating therethrough are provided opening in a bottom part of the communication groove 6. The sheet A is fixed to a sheathing board S, when concrete K is deposited, surplus water and bubbles are discharged via the drain path 5 to the outside of a mold while filtered in the small hole 7 and the drain path 5, and a cement grain is suppressed from its outflow to the outside.

Description

Detailed Description of the Invention (Industrial Field of Application) This invention provides double-sided tape or adhesive on the surface side of the weir plate that is in direct contact with the concrete (the side in contact with the concrete) of the concrete formwork that serves as the mold for concrete pouring. This sheet relates to a weir board installation sheet that is used by attaching it with adhesive, nails, staples, etc.

(Conventional technology) Concrete work is carried out by pouring concrete into formwork, but with conventional formwork, no improvements were made to the concrete or the weir plates that were in direct contact with it, so the following There were some problems as described in.

In other words, in general, the larger the unit water volume, the easier the concrete mixing and pouring work will be, but on the other hand, if the unit water volume is large, even after the concrete is poured, excess water will be generated due to the settling of solid particles. The so-called breathing phenomenon, in which water separates and rises, becomes severe, and this treeing phenomenon causes the upper part of the concrete to become porous, and a wood film forms on the bottom surface of the aggregate grains, making it difficult for them to adhere to the cement paste. As a result of the weakening, the strength, watertightness and durability of the concrete are impaired, and the surface of the concrete is prone to water and air pockmarks.

In addition, in order to ensure the specified quality of concrete after pouring, a certain period of curing is required, and during this curing period, the temperature of the concrete is maintained at a constant temperature (preferably around 20 degrees Celsius, according to one theory). However, conventional concrete formwork does not have a special heat insulation effect,
Therefore, in cold regions or in winter, the curing period becomes longer, and curing becomes insufficient, resulting in a decline in the quality of concrete.
Also, especially in cold regions, the water in the concrete freezes, preventing the hydration reaction of the cement from occurring, and the concrete will not harden. In addition, when cement hydrates, it generates eternal heat, which generates heat from the concrete itself or from within.
As long as the outside temperature is not particularly low, it is possible to obtain the concrete temperature necessary for curing, but a temperature difference occurs between the concrete surface and the inside, which is affected by the outside temperature, and this temperature difference inside and outside can cause cracks in the concrete. occurs. The degree of this cracking increases as the outside temperature decreases and as the calorific value of cement increases. Additionally, if the outside temperature fluctuates widely, the temperature of the concrete during curing will also fluctuate, and this temperature change will result in insufficient curing and a decrease in product strength. Therefore, among the above-mentioned problems, the following sheet for installing weir boards has recently been proposed as a means for preventing the occurrence of water pockmarks and air pockmarks caused by excess water and air bubbles.

(1) A sheet made of double woven fabric with a weave of 2 microns or less, and 5 to 5 holes with a diameter of 3 to 5 cm.
It is used by being attached with adhesive or staples to a large number of weir plates spaced at 10c+a intervals.

(2) A sheet consisting of two layers: a permeable sheet and a drainage net, and is used by being attached to the surface of a weir board with adhesive or staples. (3) A sheet made of a mesh-like nonwoven fabric impregnated with a highly absorbent polymer is used by being attached to the surface of the sheath board with adhesive or staples.

(Problems to be Solved by the Invention) However, such conventional sheets do not have the above-mentioned heat-insulating and heat-retaining effect, unless they are capable of removing excess wood or air bubbles. In addition, after concrete is poured, when the concrete reaches the required strength, the sheet must be removed from the concrete. Conventional sheets do not have good peelability, so it is necessary to use a peeling agent before concrete is poured. must be applied to the hill, which is costly and difficult to work with.

Also, even if a peeling agent is applied, the cement paste will penetrate between the textures and laminated materials and harden, causing the sheet to adhere to the concrete and requiring the use of a jack, etc. to remove the sheet. There is always a problem with poor workability.

The present invention was devised in view of the problems of conventional sheets for installing weir panels, and its purpose is to discharge excess water and air bubbles from concrete and achieve a heat insulation effect. Another object of the present invention is to provide a sheet for installing weir boards that is easy to use and is made from concrete.

(Means for Solving the Problem) As a means for achieving the above-mentioned object, in the sheet for installing a weir board of the present invention, a large number of micro protrusions protrudingly formed on the back side of a closed-cell foamed synthetic resin sheet layer , a communication groove is provided between each of the microprotrusions along the surface thereof, and a communication groove is formed to form a fine filtration drainage channel capable of filtering cement particles, and the foamed synthetic resin sheet layer is provided with a communication groove. It has a structure with many small water holes that communicate with it.

In addition, by using a foamed synthetic resin sheet layer with a polyolefin resin film layer laminated on the front side, or by forming communicating grooves by embossing on the back side of a foamed synthetic resin sheet layer with a polyolefin resin film layer laminated on the outer surface. You may also do so.

(Function) The sheet for installing a weir plate of the present invention is attached to the surface side of the weir plate that is in direct contact with concrete in a concrete formwork that is composed of a weir plate that is in contact with concrete, and shoring and binding materials that support it. There are some things that are used. To attach the sheet to the weir board, you can attach a pressure-sensitive adhesive to the back of the sheet in advance and attach it to the surface of the weir board, or you can use double-sided tape or adhesive that is separate from the sheet. Alternatively, the sheet may be attached using nails, staples, etc., or the sheet may be attached in advance during the manufacturing stage of the weir board. In addition, regarding the width of the sheet for installing the weir board, there are cases where a sheet with the same width as the weir board is used, and a sheet that is slightly wider than the weir board and whose outer edge is placed on the side or back side of the formwork. There are cases where it is fixed in the folded state.

When pouring concrete using a weir plate to which the weir plate installation sheet of the present invention is attached, the weir plate is assembled using shoring and binding materials, and then concrete is poured between the weir plates. After the poured concrete has achieved the necessary strength, the weir is removed.

Since the weir plate installation sheet of the present invention is constructed as described above, excess water and air bubbles in the concrete can be removed through small water passage holes and grooves provided on the back surfaces of the weir plate and the weir plate installation sheet. It can be discharged outside the formwork through a fine filtration drainage channel formed by a communication groove. In the water passage small holes, primary filtration of fine aggregate and cement particles is performed, and then,
By performing secondary filtration of fine aggregate and cement particles in the WL narrow drainage channel, the outflow of cement particles to the outside can be suppressed to a minimum.

Therefore, it is possible to prevent water pockmarks and air pockmarks due to the presence of excess water or air bubbles, and form a dense and durable concrete object.

Furthermore, since the sheet for installing weir boards of the present invention forms an air insulation layer with the closed-cell foamed synthetic resin sheet layer, it suppresses heat radiation from the concrete surface even when the outside air temperature is low. 'C, it is possible to prevent concrete from cracking due to temperature difference between inside and outside, it is possible to shorten the curing period by stabilizing the curing temperature, and it is possible to increase the compressive strength of the product at an early stage.

In addition, since the sheet for installing weir boards of the present invention is composed of a foamed synthetic resin sheet layer, it is easy to peel off from concrete, and therefore there is no need to apply a peeling agent, improving workability. I can do it.

In addition, by planting a polyolefin resin film layer on the surface side of the foamed synthetic resin sheet layer that is in contact with concrete, the peelability from the concrete is further improved.
In addition, the surface of the concrete can be finished smoothly, the workability of water holes is improved, and the strength (chemical and physical) is also improved, so it can be used as a material for the foamed synthetic resin sheet layer. Lack of strength or heat retention F! It becomes possible to use a material with a high expansion ratio and excellent heat resistance, and therefore it is possible to improve the heat retention and insulation properties or to make the sheet layer thinner.

In addition, by forming communication grooves by embossing on the back side of the foamed synthetic resin sheet layer with a polyolefin resin film layer on the outer surface, we can improve the workability of water holes and heat insulation. This makes it possible to improve the properties or make the sheet layer thinner, and the shape of the communicating groove can be reliably maintained by the shape-retaining force of the embossed resin film layer.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

First, the configuration of the embodiment will be explained.

As shown in FIGS. 1 to 3, the sheet A for installing a weir board in this example includes a foamed synthetic resin sheet layer 1, a polyolefin resin film layer 2 on the front side, and a polyolefin resin film layer 2 on the back side. It is composed of three layers.

iyi The foamed synthetic resin sheet layer 1 is a layer mainly for forming an air insulation layer on the surface of poured concrete, and in this example, it is made of non-crosslinked, closed-cell, high-cell (40 times foamed) foamed polyethylene. Sheet lO is used.

The front side polyolefin resin film layer 2 and the back side polyolefin resin film layer 3 mainly serve to reinforce the foamed polyethylene sheet 10 by being laminated on both the front and back sides of the foamed polyethylene sheet 10. In this example, a polyethylene resin film 20.30 mm is used. Note that this polyolefin resin film layer 2 may be formed by applying the same type of resin.

Then, on the back side of the foamed polyethylene sheet 10 on which the polyethylene resin film 30 is laminated, a large number of square pyramid-shaped minute protrusions 4 densely arranged in the vertical and horizontal directions are formed protrudingly by embossing process, so that each of the minute protrusions 4 ,4
A communication y for forming a fine drainage channel 5 that communicates along the surface direction between them and is capable of filtering cement particles.
A groove t8 is provided at the bottom of the communication groove 6, and a large number of small water passage holes 7 are provided at the bottom of the communication groove 6, penetrating the foamed polyethylene sheet 10 and both the front and back polyethylene resin films 20 and 30.

This small water passage hole 7 is provided with a primary filtration and drainage function to discharge excess water and air bubbles in the concrete in the direction penetrating the sheet A, and in this embodiment has a diameter of 0.8 mm.
Water passage holes 7 consisting of one layer of round holes are opened in a staggered pattern with three layers vertically and horizontally.

Incidentally, if the diameter of the water passage holes 7 is increased, the efficiency of discharging excess water and air bubbles will be improved, but on the other hand, the filtration function of fine aggregate and cement particles will be reduced, and if the diameter is made small, the surface repellency of the sheet A will be reduced. Because it is difficult to drain excess water and air bubbles due to water action, it is desirable to set it in the range of 0.8 to 1.0, or even in the range of 0.5 to 2.0. It is considered to be acceptable sushi.

Furthermore, since the communication grooves 6 are for forming the fine filtration and drainage channels 5 that can filter cement particles as described above, it is desirable that the cross-sectional area is as small as possible and that they are formed in large numbers. .

Therefore, in this embodiment, the bottom surface of each microprotrusion 4 is 1. (
The height at one corner of Is is 0. It is formed into a 3m square complex,
Width: 0.8■■, center height: 0.21 even when subjected to lateral pressure
The filtration drainage channel 5 of about 100 liters is ensured.

Next, the operation of this embodiment will be explained.

Since the weir board installation sheet A of this embodiment has the above-mentioned configuration, first, the back side of the weir board installation sheet A is placed against the surface of the weir board S of the concrete formwork and fixed on the stable a. As a result, as shown in FIG. 8, the weir board installation sheet A can be lined on the surface of the weir board S. Materials for the weir plate S include wood, steel plate, aluminum alloy plate,
Synthetic resin boards, paper, boats, concrete products, etc.
When attaching the weir board installation sheet A with staples, the material is limited to wood, etc., but when attaching with double-sided tape or adhesive, other materials may be used. In addition, what is indicated by 8 in the figure is a wood cutting hole formed in the weir plate S, and is for quickly draining excess water in the concrete.

Therefore, as described above, the weir board S lined with the weir board installation sheet A was assembled using shoring and binding materials, and the weir board S
When concrete κ is poured between the holes, excess water and air bubbles in the concrete K are pushed out to the back side of the sheet A through the small water passage holes 7 made in the sheet A due to the internal pressure. It is efficiently discharged outside the formwork through a fine drainage channel 5 formed between the communication groove 6 and the weir plate S. Then, in the small water passage hole 7, the first filtering of fine aggregate and cement particles is carried out, and then in the fine filtration drainage channel 5, the second filtering of the fine aggregate and cement particles is carried out. This two-stage filtering action suppresses the outflow of cement particles to the outside.

Therefore, even if the unit water volume of concrete K is large, the occurrence of the breathing phenomenon can be suppressed + FL / the hardness of concrete K,
In addition to improving watertightness and durability, it also prevents water and air pockmarks from forming on the concrete surface.
In addition, cement particles and fine aggregate gather on the surface layer of the concrete along with the flow of water, making the concrete structure of the surface layer denser, creating a beautiful concrete surface, and improving durability by increasing the strength of the concrete surface layer. can be significantly improved.

In addition, an air insulation layer is formed on the surface of the weir plate S in contact with the concrete surface by the closed-cell expanded polyethylene sheet layer 1O, and curing is performed while the concrete surface is insulated and kept warm, so it is heated by the heat of hydration. Even if the temperature of the outside air is lower than the temperature inside the concrete,
The heat radiation of the concrete surface is suppressed by the direct heat insulation effect of the air insulation layer on the concrete surface, thus making it possible to prevent the concrete K from cracking due to the difference in temperature between inside and outside.

In addition, the excellent insulation and heat retention effect described above dramatically reduces the effects of fluctuations in outside temperature and minimizes temperature changes in concrete during curing, allowing the concrete to begin to gain strength by stabilizing the curing temperature. By advancing the curing period, it is possible to shorten the curing period and increase the compressive strength of the product.

In addition, in this example, polyethylene resin films 20.
By adopting a three-layer structure reinforced with 0, it is possible to improve the workability of the small water passage holes 7 and to improve the heat retention and insulation properties of the sheet A, or to make it thinner. In addition, a polyethylene resin film 2 laminated on the surface side
0 has a slippery surface and no affinity with concrete K, and has excellent peeling properties, so you can omit the need to apply glue or remove adhering concrete after pouring, improving work efficiency. This makes it possible to improve the quality of the concrete and reduce labor, and it also makes it possible to finish the concrete surface with a smooth surface.

In addition, by forming the communication grooves 6 by embossing on the back side of the foamed polyethylene sheet 10 on which the polyethylene resin film 30 is laminated, the communication grooves 6 are formed by the shape-retaining force of the embossed polyethylene resin sheet 30.
Therefore, as the material for the foamed synthetic resin sheet layer 1, it is possible to use a flexible, inexpensive non-stretched and highly foamed synthetic resin material (for example, polyethylene).

Next, Fig. 5.6.7 shows another embodiment of the sheet for installing a weir board according to the present invention.

First, the weir board installation sheet B shown in Fig. 5 has small water passage holes 7 composed of vertical slits and horizontal slits, and is formed in a pattern in which these are arranged alternately in the front, back, left, and right. The only difference is from sheet A for installing weir boards in the previous example. Next, the sheath board installation seams shown in Figs. 6 and 7 }-C,
D is different from the weir board installation sheet A of the above embodiment in that the small water passage holes 7 are formed with slits and round holes.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments. For example, in the example, an unstretched, highly foamed (40 times foamed) foamed polyethylene sheet 10 is used as the closed-cell foamed synthetic resin sheet layer 1, and a polyethylene resin film 20.30 is planted on both the front and back surfaces of the foamed polyethylene sheet 10. Although the case where a reinforced three-layer structure is used is shown, it is not limited to this, and other foamed synthetic resins such as foamed polystyrene, foamed polypropylene, and foamed polyvinyl chloride can also be used, and a laminated reinforced film The presence or absence of the foam and the foaming ratio are also optional. In the case of foamed polystyrene and foamed polypropylene, a reinforcing film on the back side is not necessary since they have excellent shape retention.

In addition, although the embodiment shows a case in which the microprotrusions 4 are formed by embossing, the formation method and protrusion shape are arbitrary, and for example, a large number of resin particles etc. may be bonded together. good.

In addition, if the fine drainage channel 5 formed between the minute protrusions 4 and 4 is too large, the filter residue of cement particles will become small, and if it is too small, it will become clogged and the drainage efficiency of excess water will be poor. Therefore, when receiving lateral pressure, the width in the small diameter direction is 0.
．． A tumor size of 1.0 to 0.3 mm is desirable.

(Effects of the Invention) As explained above, in the sheet for installing a weir board according to the present invention, each microprotrusion is A communication groove is provided between the foamed synthetic resin sheet layer and a plurality of communication grooves that communicate with the communication groove and form a fine filtration and drainage channel that can filter cement particles. By opening a small water passage hole, excess water and air bubbles in the concrete are removed from the water passage hole and minute +1!:j!I
It can be efficiently discharged to the outside via the wood removal path, and has a two-stage filtration action: the primary discharge action through small water passage holes, and the secondary filtration action through fine filtration and drainage channels. By this method, the outflow of cement particles to the outside can be suppressed to a minimum, and therefore, even if the unit water volume of concrete is large, the occurrence of breathing phenomenon can be suppressed, and the hardness, water tightness, and durability of concrete can be improved. The occurrence of water and air pockmarks on the surface is prevented, and the flow of water collects cement particles and fine aggregate on the concrete surface layer, creating a dense concrete structure, resulting in a beautiful concrete surface. Furthermore, the durability of the concrete will be greatly improved by improving the strength of the concrete surface layer.

In addition, since the sheet for installing weir boards of the present invention forms an air insulation layer with the closed-cell foamed synthetic resin sheet layer, it suppresses heat radiation from the concrete surface even when the outside air temperature is low. This makes it possible to prevent concrete from cracking due to differences in temperature between inside and outside, and also to shorten the curing period by stabilizing the curing temperature, and to quickly increase the compressive strength of the product.

Furthermore, since the weir board installation sheet of the present invention is composed of a foamed synthetic resin sheet layer, it can be easily peeled off from concrete, and therefore, there is no need to apply a peeling agent, improving workability. can be done.

In addition, by laminating a polyolefin resin film layer on the surface side of the foamed synthetic resin sheet layer in contact with concrete, the peelability from the concrete is further improved.
In addition, the surface of the concrete can be finished smoothly, the workability of water holes is improved, and the strength (chemical and physical) is improved, so the material of the foamed synthetic resin sheet layer is improved. Therefore, it is a material with a high expansion ratio that lacks strength but has excellent heat retention and insulation properties.Therefore, it is necessary to improve the heat retention and insulation properties or make the sheet layer thinner.

In addition, communication grooves are formed by embossing on the back side of the foamed synthetic resin sheet layer, which has a polyolefin resin film layer laminated on the outer surface. Similarly to the above, it is possible to improve the workability of water holes, improve heat retention and insulation properties, or make the sheet layer thinner, and the shape of the embossed resin film layer ensures that the shape of the communication groove is maintained. become able to.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of a sheet for installing a weir board according to the present invention, Fig. 2 is an enlarged back view of the same main part, and Fig. 3 is an example of a sheet for installing a weir board according to an embodiment of the present invention. FIG. 4 is a partially enlarged explanatory view showing the state of use of the weir board cladding sheet according to the embodiment of the present invention, and FIGS. A partially enlarged surface view of another example of the sheet for use,
FIG. 8 is a perspective view showing a state in which the weir board installation sheet for undeveloped IJ1 is attached to the weir board with staples. l: Foamed synthetic resin sheet layer 2: Polyolefin resin film layer (front side) 3: Polyolefin resin film layer (back side) 4: Microprotrusion 5: Fine drainage channel 6: Communication groove 7 : Water passage small hole

Claims (1)

[Claims] 1) A large number of microprotrusions protruding from the back side of the closed-cell foamed synthetic resin sheet layer allows communication between each microprotrusion along the surface direction thereof, and allows cement particles to be filtered. In addition to installing communication grooves that form fine filtration and drainage channels,
A sheet for installing a weir board, characterized in that the foamed synthetic resin sheet layer has a large number of water passage holes that communicate with the communication groove. 2) The sheet for installing a weir board according to claim 1, comprising a foamed synthetic resin sheet layer having a polyolefin resin film layer laminated on the surface side. 3) The sheet for installing a weir board according to claim 1 or 2, wherein communicating grooves are formed by embossing on the back side of the foamed synthetic resin sheet layer having the polyolefin resin film layer laminated on the outer surface.